netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27 #define NFT_SET_MAX_ANONLEN 16
  28
  29 unsigned int nf_tables_net_id __read_mostly;
  30
  31 static LIST_HEAD(nf_tables_expressions);
  32 static LIST_HEAD(nf_tables_objects);
  33 static LIST_HEAD(nf_tables_flowtables);
  34 static LIST_HEAD(nf_tables_destroy_list);
  35 static LIST_HEAD(nf_tables_gc_list);
  36 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  37 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
  38
  39 enum {
  40         NFT_VALIDATE_SKIP       = 0,
  41         NFT_VALIDATE_NEED,
  42         NFT_VALIDATE_DO,
  43 };
  44
  45 static struct rhltable nft_objname_ht;
  46
  47 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  48 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  49 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  50
  51 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  52 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  53 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  54
  55 static const struct rhashtable_params nft_chain_ht_params = {
  56         .head_offset            = offsetof(struct nft_chain, rhlhead),
  57         .key_offset             = offsetof(struct nft_chain, name),
  58         .hashfn                 = nft_chain_hash,
  59         .obj_hashfn             = nft_chain_hash_obj,
  60         .obj_cmpfn              = nft_chain_hash_cmp,
  61         .automatic_shrinking    = true,
  62 };
  63
  64 static const struct rhashtable_params nft_objname_ht_params = {
  65         .head_offset            = offsetof(struct nft_object, rhlhead),
  66         .key_offset             = offsetof(struct nft_object, key),
  67         .hashfn                 = nft_objname_hash,
  68         .obj_hashfn             = nft_objname_hash_obj,
  69         .obj_cmpfn              = nft_objname_hash_cmp,
  70         .automatic_shrinking    = true,
  71 };
  72
  73 struct nft_audit_data {
  74         struct nft_table *table;
  75         int entries;
  76         int op;
  77         struct list_head list;
  78 };
  79
  80 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  81         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  82         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  84         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  85         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  87         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  88         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  90         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  91         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  93         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  94         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  96         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  97         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  99         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
 100         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
 101         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
 102         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 103         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 104         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 105         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 106         [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
 107 };
 108
 109 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
 110 {
 111         switch (table->validate_state) {
 112         case NFT_VALIDATE_SKIP:
 113                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 114                 break;
 115         case NFT_VALIDATE_NEED:
 116                 break;
 117         case NFT_VALIDATE_DO:
 118                 if (new_validate_state == NFT_VALIDATE_NEED)
 119                         return;
 120         }
 121
 122         table->validate_state = new_validate_state;
 123 }
 124 static void nf_tables_trans_destroy_work(struct work_struct *w);
 125 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 126
 127 static void nft_trans_gc_work(struct work_struct *work);
 128 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
 129
 130 static void nft_ctx_init(struct nft_ctx *ctx,
 131                          struct net *net,
 132                          const struct sk_buff *skb,
 133                          const struct nlmsghdr *nlh,
 134                          u8 family,
 135                          struct nft_table *table,
 136                          struct nft_chain *chain,
 137                          const struct nlattr * const *nla)
 138 {
 139         ctx->net        = net;
 140         ctx->family     = family;
 141         ctx->level      = 0;
 142         ctx->table      = table;
 143         ctx->chain      = chain;
 144         ctx->nla        = nla;
 145         ctx->portid     = NETLINK_CB(skb).portid;
 146         ctx->report     = nlmsg_report(nlh);
 147         ctx->flags      = nlh->nlmsg_flags;
 148         ctx->seq        = nlh->nlmsg_seq;
 149 }
 150
 151 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 152                                              int msg_type, u32 size, gfp_t gfp)
 153 {
 154         struct nft_trans *trans;
 155
 156         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 157         if (trans == NULL)
 158                 return NULL;
 159
 160         INIT_LIST_HEAD(&trans->list);
 161         INIT_LIST_HEAD(&trans->binding_list);
 162         trans->msg_type = msg_type;
 163         trans->ctx      = *ctx;
 164
 165         return trans;
 166 }
 167
 168 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 169                                          int msg_type, u32 size)
 170 {
 171         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 172 }
 173
 174 static void nft_trans_list_del(struct nft_trans *trans)
 175 {
 176         list_del(&trans->list);
 177         list_del(&trans->binding_list);
 178 }
 179
 180 static void nft_trans_destroy(struct nft_trans *trans)
 181 {
 182         nft_trans_list_del(trans);
 183         kfree(trans);
 184 }
 185
 186 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
 187                                  bool bind)
 188 {
 189         struct nftables_pernet *nft_net;
 190         struct net *net = ctx->net;
 191         struct nft_trans *trans;
 192
 193         if (!nft_set_is_anonymous(set))
 194                 return;
 195
 196         nft_net = nft_pernet(net);
 197         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 198                 switch (trans->msg_type) {
 199                 case NFT_MSG_NEWSET:
 200                         if (nft_trans_set(trans) == set)
 201                                 nft_trans_set_bound(trans) = bind;
 202                         break;
 203                 case NFT_MSG_NEWSETELEM:
 204                         if (nft_trans_elem_set(trans) == set)
 205                                 nft_trans_elem_set_bound(trans) = bind;
 206                         break;
 207                 }
 208         }
 209 }
 210
 211 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 212 {
 213         return __nft_set_trans_bind(ctx, set, true);
 214 }
 215
 216 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
 217 {
 218         return __nft_set_trans_bind(ctx, set, false);
 219 }
 220
 221 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
 222                                    struct nft_chain *chain, bool bind)
 223 {
 224         struct nftables_pernet *nft_net;
 225         struct net *net = ctx->net;
 226         struct nft_trans *trans;
 227
 228         if (!nft_chain_binding(chain))
 229                 return;
 230
 231         nft_net = nft_pernet(net);
 232         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 233                 switch (trans->msg_type) {
 234                 case NFT_MSG_NEWCHAIN:
 235                         if (nft_trans_chain(trans) == chain)
 236                                 nft_trans_chain_bound(trans) = bind;
 237                         break;
 238                 case NFT_MSG_NEWRULE:
 239                         if (trans->ctx.chain == chain)
 240                                 nft_trans_rule_bound(trans) = bind;
 241                         break;
 242                 }
 243         }
 244 }
 245
 246 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
 247                                  struct nft_chain *chain)
 248 {
 249         __nft_chain_trans_bind(ctx, chain, true);
 250 }
 251
 252 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 253 {
 254         if (!nft_chain_binding(chain))
 255                 return 0;
 256
 257         if (nft_chain_binding(ctx->chain))
 258                 return -EOPNOTSUPP;
 259
 260         if (chain->bound)
 261                 return -EBUSY;
 262
 263         if (!nft_use_inc(&chain->use))
 264                 return -EMFILE;
 265
 266         chain->bound = true;
 267         nft_chain_trans_bind(ctx, chain);
 268
 269         return 0;
 270 }
 271
 272 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 273 {
 274         __nft_chain_trans_bind(ctx, chain, false);
 275 }
 276
 277 static int nft_netdev_register_hooks(struct net *net,
 278                                      struct list_head *hook_list)
 279 {
 280         struct nft_hook *hook;
 281         int err, j;
 282
 283         j = 0;
 284         list_for_each_entry(hook, hook_list, list) {
 285                 err = nf_register_net_hook(net, &hook->ops);
 286                 if (err < 0)
 287                         goto err_register;
 288
 289                 j++;
 290         }
 291         return 0;
 292
 293 err_register:
 294         list_for_each_entry(hook, hook_list, list) {
 295                 if (j-- <= 0)
 296                         break;
 297
 298                 nf_unregister_net_hook(net, &hook->ops);
 299         }
 300         return err;
 301 }
 302
 303 static void nft_netdev_unregister_hooks(struct net *net,
 304                                         struct list_head *hook_list,
 305                                         bool release_netdev)
 306 {
 307         struct nft_hook *hook, *next;
 308
 309         list_for_each_entry_safe(hook, next, hook_list, list) {
 310                 nf_unregister_net_hook(net, &hook->ops);
 311                 if (release_netdev) {
 312                         list_del(&hook->list);
 313                         kfree_rcu(hook, rcu);
 314                 }
 315         }
 316 }
 317
 318 static int nf_tables_register_hook(struct net *net,
 319                                    const struct nft_table *table,
 320                                    struct nft_chain *chain)
 321 {
 322         struct nft_base_chain *basechain;
 323         const struct nf_hook_ops *ops;
 324
 325         if (table->flags & NFT_TABLE_F_DORMANT ||
 326             !nft_is_base_chain(chain))
 327                 return 0;
 328
 329         basechain = nft_base_chain(chain);
 330         ops = &basechain->ops;
 331
 332         if (basechain->type->ops_register)
 333                 return basechain->type->ops_register(net, ops);
 334
 335         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 336                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 337
 338         return nf_register_net_hook(net, &basechain->ops);
 339 }
 340
 341 static void __nf_tables_unregister_hook(struct net *net,
 342                                         const struct nft_table *table,
 343                                         struct nft_chain *chain,
 344                                         bool release_netdev)
 345 {
 346         struct nft_base_chain *basechain;
 347         const struct nf_hook_ops *ops;
 348
 349         if (table->flags & NFT_TABLE_F_DORMANT ||
 350             !nft_is_base_chain(chain))
 351                 return;
 352         basechain = nft_base_chain(chain);
 353         ops = &basechain->ops;
 354
 355         if (basechain->type->ops_unregister)
 356                 return basechain->type->ops_unregister(net, ops);
 357
 358         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 359                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 360                                             release_netdev);
 361         else
 362                 nf_unregister_net_hook(net, &basechain->ops);
 363 }
 364
 365 static void nf_tables_unregister_hook(struct net *net,
 366                                       const struct nft_table *table,
 367                                       struct nft_chain *chain)
 368 {
 369         return __nf_tables_unregister_hook(net, table, chain, false);
 370 }
 371
 372 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 373 {
 374         struct nftables_pernet *nft_net = nft_pernet(net);
 375
 376         switch (trans->msg_type) {
 377         case NFT_MSG_NEWSET:
 378                 if (!nft_trans_set_update(trans) &&
 379                     nft_set_is_anonymous(nft_trans_set(trans)))
 380                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 381                 break;
 382         case NFT_MSG_NEWCHAIN:
 383                 if (!nft_trans_chain_update(trans) &&
 384                     nft_chain_binding(nft_trans_chain(trans)))
 385                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 386                 break;
 387         }
 388
 389         list_add_tail(&trans->list, &nft_net->commit_list);
 390 }
 391
 392 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 393 {
 394         struct nft_trans *trans;
 395
 396         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 397         if (trans == NULL)
 398                 return -ENOMEM;
 399
 400         if (msg_type == NFT_MSG_NEWTABLE)
 401                 nft_activate_next(ctx->net, ctx->table);
 402
 403         nft_trans_commit_list_add_tail(ctx->net, trans);
 404         return 0;
 405 }
 406
 407 static int nft_deltable(struct nft_ctx *ctx)
 408 {
 409         int err;
 410
 411         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 412         if (err < 0)
 413                 return err;
 414
 415         nft_deactivate_next(ctx->net, ctx->table);
 416         return err;
 417 }
 418
 419 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 420 {
 421         struct nft_trans *trans;
 422
 423         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 424         if (trans == NULL)
 425                 return ERR_PTR(-ENOMEM);
 426
 427         if (msg_type == NFT_MSG_NEWCHAIN) {
 428                 nft_activate_next(ctx->net, ctx->chain);
 429
 430                 if (ctx->nla[NFTA_CHAIN_ID]) {
 431                         nft_trans_chain_id(trans) =
 432                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 433                 }
 434         }
 435         nft_trans_chain(trans) = ctx->chain;
 436         nft_trans_commit_list_add_tail(ctx->net, trans);
 437
 438         return trans;
 439 }
 440
 441 static int nft_delchain(struct nft_ctx *ctx)
 442 {
 443         struct nft_trans *trans;
 444
 445         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 446         if (IS_ERR(trans))
 447                 return PTR_ERR(trans);
 448
 449         nft_use_dec(&ctx->table->use);
 450         nft_deactivate_next(ctx->net, ctx->chain);
 451
 452         return 0;
 453 }
 454
 455 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
 456 {
 457         struct nft_expr *expr;
 458
 459         expr = nft_expr_first(rule);
 460         while (nft_expr_more(rule, expr)) {
 461                 if (expr->ops->activate)
 462                         expr->ops->activate(ctx, expr);
 463
 464                 expr = nft_expr_next(expr);
 465         }
 466 }
 467
 468 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
 469                               enum nft_trans_phase phase)
 470 {
 471         struct nft_expr *expr;
 472
 473         expr = nft_expr_first(rule);
 474         while (nft_expr_more(rule, expr)) {
 475                 if (expr->ops->deactivate)
 476                         expr->ops->deactivate(ctx, expr, phase);
 477
 478                 expr = nft_expr_next(expr);
 479         }
 480 }
 481
 482 static int
 483 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 484 {
 485         /* You cannot delete the same rule twice */
 486         if (nft_is_active_next(ctx->net, rule)) {
 487                 nft_deactivate_next(ctx->net, rule);
 488                 nft_use_dec(&ctx->chain->use);
 489                 return 0;
 490         }
 491         return -ENOENT;
 492 }
 493
 494 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 495                                             struct nft_rule *rule)
 496 {
 497         struct nft_trans *trans;
 498
 499         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 500         if (trans == NULL)
 501                 return NULL;
 502
 503         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 504                 nft_trans_rule_id(trans) =
 505                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 506         }
 507         nft_trans_rule(trans) = rule;
 508         nft_trans_commit_list_add_tail(ctx->net, trans);
 509
 510         return trans;
 511 }
 512
 513 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 514 {
 515         struct nft_flow_rule *flow;
 516         struct nft_trans *trans;
 517         int err;
 518
 519         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 520         if (trans == NULL)
 521                 return -ENOMEM;
 522
 523         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 524                 flow = nft_flow_rule_create(ctx->net, rule);
 525                 if (IS_ERR(flow)) {
 526                         nft_trans_destroy(trans);
 527                         return PTR_ERR(flow);
 528                 }
 529
 530                 nft_trans_flow_rule(trans) = flow;
 531         }
 532
 533         err = nf_tables_delrule_deactivate(ctx, rule);
 534         if (err < 0) {
 535                 nft_trans_destroy(trans);
 536                 return err;
 537         }
 538         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 539
 540         return 0;
 541 }
 542
 543 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 544 {
 545         struct nft_rule *rule;
 546         int err;
 547
 548         list_for_each_entry(rule, &ctx->chain->rules, list) {
 549                 if (!nft_is_active_next(ctx->net, rule))
 550                         continue;
 551
 552                 err = nft_delrule(ctx, rule);
 553                 if (err < 0)
 554                         return err;
 555         }
 556         return 0;
 557 }
 558
 559 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 560                                struct nft_set *set,
 561                                const struct nft_set_desc *desc)
 562 {
 563         struct nft_trans *trans;
 564
 565         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 566         if (trans == NULL)
 567                 return -ENOMEM;
 568
 569         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 570                 nft_trans_set_id(trans) =
 571                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 572                 nft_activate_next(ctx->net, set);
 573         }
 574         nft_trans_set(trans) = set;
 575         if (desc) {
 576                 nft_trans_set_update(trans) = true;
 577                 nft_trans_set_gc_int(trans) = desc->gc_int;
 578                 nft_trans_set_timeout(trans) = desc->timeout;
 579                 nft_trans_set_size(trans) = desc->size;
 580         }
 581         nft_trans_commit_list_add_tail(ctx->net, trans);
 582
 583         return 0;
 584 }
 585
 586 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 587                              struct nft_set *set)
 588 {
 589         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 590 }
 591
 592 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
 593                                   struct nft_set *set,
 594                                   const struct nft_set_iter *iter,
 595                                   struct nft_elem_priv *elem_priv)
 596 {
 597         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
 598
 599         if (!nft_set_elem_active(ext, iter->genmask))
 600                 return 0;
 601
 602         nft_set_elem_change_active(ctx->net, set, ext);
 603         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
 604
 605         return 0;
 606 }
 607
 608 struct nft_set_elem_catchall {
 609         struct list_head        list;
 610         struct rcu_head         rcu;
 611         struct nft_elem_priv    *elem;
 612 };
 613
 614 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
 615                                         struct nft_set *set)
 616 {
 617         u8 genmask = nft_genmask_next(ctx->net);
 618         struct nft_set_elem_catchall *catchall;
 619         struct nft_set_ext *ext;
 620
 621         list_for_each_entry(catchall, &set->catchall_list, list) {
 622                 ext = nft_set_elem_ext(set, catchall->elem);
 623                 if (!nft_set_elem_active(ext, genmask))
 624                         continue;
 625
 626                 nft_set_elem_change_active(ctx->net, set, ext);
 627                 nft_setelem_data_deactivate(ctx->net, set, catchall->elem);
 628                 break;
 629         }
 630 }
 631
 632 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
 633 {
 634         struct nft_set_iter iter = {
 635                 .genmask        = nft_genmask_next(ctx->net),
 636                 .type           = NFT_ITER_UPDATE,
 637                 .fn             = nft_mapelem_deactivate,
 638         };
 639
 640         set->ops->walk(ctx, set, &iter);
 641         WARN_ON_ONCE(iter.err);
 642
 643         nft_map_catchall_deactivate(ctx, set);
 644 }
 645
 646 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 647 {
 648         int err;
 649
 650         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 651         if (err < 0)
 652                 return err;
 653
 654         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
 655                 nft_map_deactivate(ctx, set);
 656
 657         nft_deactivate_next(ctx->net, set);
 658         nft_use_dec(&ctx->table->use);
 659
 660         return err;
 661 }
 662
 663 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 664                              struct nft_object *obj)
 665 {
 666         struct nft_trans *trans;
 667
 668         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 669         if (trans == NULL)
 670                 return -ENOMEM;
 671
 672         if (msg_type == NFT_MSG_NEWOBJ)
 673                 nft_activate_next(ctx->net, obj);
 674
 675         nft_trans_obj(trans) = obj;
 676         nft_trans_commit_list_add_tail(ctx->net, trans);
 677
 678         return 0;
 679 }
 680
 681 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 682 {
 683         int err;
 684
 685         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 686         if (err < 0)
 687                 return err;
 688
 689         nft_deactivate_next(ctx->net, obj);
 690         nft_use_dec(&ctx->table->use);
 691
 692         return err;
 693 }
 694
 695 static struct nft_trans *
 696 nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 697                         struct nft_flowtable *flowtable)
 698 {
 699         struct nft_trans *trans;
 700
 701         trans = nft_trans_alloc(ctx, msg_type,
 702                                 sizeof(struct nft_trans_flowtable));
 703         if (trans == NULL)
 704                 return ERR_PTR(-ENOMEM);
 705
 706         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 707                 nft_activate_next(ctx->net, flowtable);
 708
 709         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 710         nft_trans_flowtable(trans) = flowtable;
 711         nft_trans_commit_list_add_tail(ctx->net, trans);
 712
 713         return trans;
 714 }
 715
 716 static int nft_delflowtable(struct nft_ctx *ctx,
 717                             struct nft_flowtable *flowtable)
 718 {
 719         struct nft_trans *trans;
 720
 721         trans = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 722         if (IS_ERR(trans))
 723                 return PTR_ERR(trans);
 724
 725         nft_deactivate_next(ctx->net, flowtable);
 726         nft_use_dec(&ctx->table->use);
 727
 728         return 0;
 729 }
 730
 731 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 732 {
 733         int i;
 734
 735         for (i = track->regs[dreg].num_reg; i > 0; i--)
 736                 __nft_reg_track_cancel(track, dreg - i);
 737 }
 738
 739 static void __nft_reg_track_update(struct nft_regs_track *track,
 740                                    const struct nft_expr *expr,
 741                                    u8 dreg, u8 num_reg)
 742 {
 743         track->regs[dreg].selector = expr;
 744         track->regs[dreg].bitwise = NULL;
 745         track->regs[dreg].num_reg = num_reg;
 746 }
 747
 748 void nft_reg_track_update(struct nft_regs_track *track,
 749                           const struct nft_expr *expr, u8 dreg, u8 len)
 750 {
 751         unsigned int regcount;
 752         int i;
 753
 754         __nft_reg_track_clobber(track, dreg);
 755
 756         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 757         for (i = 0; i < regcount; i++, dreg++)
 758                 __nft_reg_track_update(track, expr, dreg, i);
 759 }
 760 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 761
 762 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 763 {
 764         unsigned int regcount;
 765         int i;
 766
 767         __nft_reg_track_clobber(track, dreg);
 768
 769         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 770         for (i = 0; i < regcount; i++, dreg++)
 771                 __nft_reg_track_cancel(track, dreg);
 772 }
 773 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 774
 775 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 776 {
 777         track->regs[dreg].selector = NULL;
 778         track->regs[dreg].bitwise = NULL;
 779         track->regs[dreg].num_reg = 0;
 780 }
 781 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 782
 783 /*
 784  * Tables
 785  */
 786
 787 static struct nft_table *nft_table_lookup(const struct net *net,
 788                                           const struct nlattr *nla,
 789                                           u8 family, u8 genmask, u32 nlpid)
 790 {
 791         struct nftables_pernet *nft_net;
 792         struct nft_table *table;
 793
 794         if (nla == NULL)
 795                 return ERR_PTR(-EINVAL);
 796
 797         nft_net = nft_pernet(net);
 798         list_for_each_entry_rcu(table, &nft_net->tables, list,
 799                                 lockdep_is_held(&nft_net->commit_mutex)) {
 800                 if (!nla_strcmp(nla, table->name) &&
 801                     table->family == family &&
 802                     nft_active_genmask(table, genmask)) {
 803                         if (nft_table_has_owner(table) &&
 804                             nlpid && table->nlpid != nlpid)
 805                                 return ERR_PTR(-EPERM);
 806
 807                         return table;
 808                 }
 809         }
 810
 811         return ERR_PTR(-ENOENT);
 812 }
 813
 814 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 815                                                    const struct nlattr *nla,
 816                                                    int family, u8 genmask, u32 nlpid)
 817 {
 818         struct nftables_pernet *nft_net;
 819         struct nft_table *table;
 820
 821         nft_net = nft_pernet(net);
 822         list_for_each_entry(table, &nft_net->tables, list) {
 823                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 824                     table->family == family &&
 825                     nft_active_genmask(table, genmask)) {
 826                         if (nft_table_has_owner(table) &&
 827                             nlpid && table->nlpid != nlpid)
 828                                 return ERR_PTR(-EPERM);
 829
 830                         return table;
 831                 }
 832         }
 833
 834         return ERR_PTR(-ENOENT);
 835 }
 836
 837 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 838 {
 839         return ++table->hgenerator;
 840 }
 841
 842 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 843
 844 static const struct nft_chain_type *
 845 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 846 {
 847         if (family >= NFPROTO_NUMPROTO ||
 848             type >= NFT_CHAIN_T_MAX)
 849                 return NULL;
 850
 851         return chain_type[family][type];
 852 }
 853
 854 static const struct nft_chain_type *
 855 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 856 {
 857         const struct nft_chain_type *type;
 858         int i;
 859
 860         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 861                 type = __nft_chain_type_get(family, i);
 862                 if (!type)
 863                         continue;
 864                 if (!nla_strcmp(nla, type->name))
 865                         return type;
 866         }
 867         return NULL;
 868 }
 869
 870 struct nft_module_request {
 871         struct list_head        list;
 872         char                    module[MODULE_NAME_LEN];
 873         bool                    done;
 874 };
 875
 876 #ifdef CONFIG_MODULES
 877 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 878                                       ...)
 879 {
 880         char module_name[MODULE_NAME_LEN];
 881         struct nftables_pernet *nft_net;
 882         struct nft_module_request *req;
 883         va_list args;
 884         int ret;
 885
 886         va_start(args, fmt);
 887         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 888         va_end(args);
 889         if (ret >= MODULE_NAME_LEN)
 890                 return 0;
 891
 892         nft_net = nft_pernet(net);
 893         list_for_each_entry(req, &nft_net->module_list, list) {
 894                 if (!strcmp(req->module, module_name)) {
 895                         if (req->done)
 896                                 return 0;
 897
 898                         /* A request to load this module already exists. */
 899                         return -EAGAIN;
 900                 }
 901         }
 902
 903         req = kmalloc(sizeof(*req), GFP_KERNEL);
 904         if (!req)
 905                 return -ENOMEM;
 906
 907         req->done = false;
 908         strscpy(req->module, module_name, MODULE_NAME_LEN);
 909         list_add_tail(&req->list, &nft_net->module_list);
 910
 911         return -EAGAIN;
 912 }
 913 EXPORT_SYMBOL_GPL(nft_request_module);
 914 #endif
 915
 916 static void lockdep_nfnl_nft_mutex_not_held(void)
 917 {
 918 #ifdef CONFIG_PROVE_LOCKING
 919         if (debug_locks)
 920                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 921 #endif
 922 }
 923
 924 static const struct nft_chain_type *
 925 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 926                             u8 family, bool autoload)
 927 {
 928         const struct nft_chain_type *type;
 929
 930         type = __nf_tables_chain_type_lookup(nla, family);
 931         if (type != NULL)
 932                 return type;
 933
 934         lockdep_nfnl_nft_mutex_not_held();
 935 #ifdef CONFIG_MODULES
 936         if (autoload) {
 937                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 938                                        nla_len(nla),
 939                                        (const char *)nla_data(nla)) == -EAGAIN)
 940                         return ERR_PTR(-EAGAIN);
 941         }
 942 #endif
 943         return ERR_PTR(-ENOENT);
 944 }
 945
 946 static __be16 nft_base_seq(const struct net *net)
 947 {
 948         struct nftables_pernet *nft_net = nft_pernet(net);
 949
 950         return htons(nft_net->base_seq & 0xffff);
 951 }
 952
 953 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 954         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 955                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 956         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 957         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 958         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 959                                     .len = NFT_USERDATA_MAXLEN }
 960 };
 961
 962 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 963                                      u32 portid, u32 seq, int event, u32 flags,
 964                                      int family, const struct nft_table *table)
 965 {
 966         struct nlmsghdr *nlh;
 967
 968         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 969         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 970                            NFNETLINK_V0, nft_base_seq(net));
 971         if (!nlh)
 972                 goto nla_put_failure;
 973
 974         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 975             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 976             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 977                          NFTA_TABLE_PAD))
 978                 goto nla_put_failure;
 979
 980         if (event == NFT_MSG_DELTABLE) {
 981                 nlmsg_end(skb, nlh);
 982                 return 0;
 983         }
 984
 985         if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
 986                          htonl(table->flags & NFT_TABLE_F_MASK)))
 987                 goto nla_put_failure;
 988
 989         if (nft_table_has_owner(table) &&
 990             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 991                 goto nla_put_failure;
 992
 993         if (table->udata) {
 994                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 995                         goto nla_put_failure;
 996         }
 997
 998         nlmsg_end(skb, nlh);
 999         return 0;
1000
1001 nla_put_failure:
1002         nlmsg_trim(skb, nlh);
1003         return -1;
1004 }
1005
1006 struct nftnl_skb_parms {
1007         bool report;
1008 };
1009 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
1010
1011 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1012                                struct list_head *notify_list)
1013 {
1014         NFT_CB(skb).report = report;
1015         list_add_tail(&skb->list, notify_list);
1016 }
1017
1018 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1019 {
1020         struct nftables_pernet *nft_net;
1021         struct sk_buff *skb;
1022         u16 flags = 0;
1023         int err;
1024
1025         if (!ctx->report &&
1026             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1027                 return;
1028
1029         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1030         if (skb == NULL)
1031                 goto err;
1032
1033         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1034                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1035
1036         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1037                                         event, flags, ctx->family, ctx->table);
1038         if (err < 0) {
1039                 kfree_skb(skb);
1040                 goto err;
1041         }
1042
1043         nft_net = nft_pernet(ctx->net);
1044         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1045         return;
1046 err:
1047         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1048 }
1049
1050 static int nf_tables_dump_tables(struct sk_buff *skb,
1051                                  struct netlink_callback *cb)
1052 {
1053         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1054         struct nftables_pernet *nft_net;
1055         const struct nft_table *table;
1056         unsigned int idx = 0, s_idx = cb->args[0];
1057         struct net *net = sock_net(skb->sk);
1058         int family = nfmsg->nfgen_family;
1059
1060         rcu_read_lock();
1061         nft_net = nft_pernet(net);
1062         cb->seq = READ_ONCE(nft_net->base_seq);
1063
1064         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1065                 if (family != NFPROTO_UNSPEC && family != table->family)
1066                         continue;
1067
1068                 if (idx < s_idx)
1069                         goto cont;
1070                 if (idx > s_idx)
1071                         memset(&cb->args[1], 0,
1072                                sizeof(cb->args) - sizeof(cb->args[0]));
1073                 if (!nft_is_active(net, table))
1074                         continue;
1075                 if (nf_tables_fill_table_info(skb, net,
1076                                               NETLINK_CB(cb->skb).portid,
1077                                               cb->nlh->nlmsg_seq,
1078                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
1079                                               table->family, table) < 0)
1080                         goto done;
1081
1082                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1083 cont:
1084                 idx++;
1085         }
1086 done:
1087         rcu_read_unlock();
1088         cb->args[0] = idx;
1089         return skb->len;
1090 }
1091
1092 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1093                                       const struct nlmsghdr *nlh,
1094                                       struct netlink_dump_control *c)
1095 {
1096         int err;
1097
1098         if (!try_module_get(THIS_MODULE))
1099                 return -EINVAL;
1100
1101         rcu_read_unlock();
1102         err = netlink_dump_start(nlsk, skb, nlh, c);
1103         rcu_read_lock();
1104         module_put(THIS_MODULE);
1105
1106         return err;
1107 }
1108
1109 /* called with rcu_read_lock held */
1110 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1111                               const struct nlattr * const nla[])
1112 {
1113         struct netlink_ext_ack *extack = info->extack;
1114         u8 genmask = nft_genmask_cur(info->net);
1115         u8 family = info->nfmsg->nfgen_family;
1116         const struct nft_table *table;
1117         struct net *net = info->net;
1118         struct sk_buff *skb2;
1119         int err;
1120
1121         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1122                 struct netlink_dump_control c = {
1123                         .dump = nf_tables_dump_tables,
1124                         .module = THIS_MODULE,
1125                 };
1126
1127                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1128         }
1129
1130         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1131         if (IS_ERR(table)) {
1132                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1133                 return PTR_ERR(table);
1134         }
1135
1136         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1137         if (!skb2)
1138                 return -ENOMEM;
1139
1140         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1141                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1142                                         0, family, table);
1143         if (err < 0)
1144                 goto err_fill_table_info;
1145
1146         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1147
1148 err_fill_table_info:
1149         kfree_skb(skb2);
1150         return err;
1151 }
1152
1153 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1154 {
1155         struct nft_chain *chain;
1156         u32 i = 0;
1157
1158         list_for_each_entry(chain, &table->chains, list) {
1159                 if (!nft_is_active_next(net, chain))
1160                         continue;
1161                 if (!nft_is_base_chain(chain))
1162                         continue;
1163
1164                 if (cnt && i++ == cnt)
1165                         break;
1166
1167                 nf_tables_unregister_hook(net, table, chain);
1168         }
1169 }
1170
1171 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1172 {
1173         struct nft_chain *chain;
1174         int err, i = 0;
1175
1176         list_for_each_entry(chain, &table->chains, list) {
1177                 if (!nft_is_active_next(net, chain))
1178                         continue;
1179                 if (!nft_is_base_chain(chain))
1180                         continue;
1181
1182                 err = nf_tables_register_hook(net, table, chain);
1183                 if (err < 0)
1184                         goto err_register_hooks;
1185
1186                 i++;
1187         }
1188         return 0;
1189
1190 err_register_hooks:
1191         if (i)
1192                 nft_table_disable(net, table, i);
1193         return err;
1194 }
1195
1196 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1197 {
1198         table->flags &= ~NFT_TABLE_F_DORMANT;
1199         nft_table_disable(net, table, 0);
1200         table->flags |= NFT_TABLE_F_DORMANT;
1201 }
1202
1203 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1204 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1205 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1206 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1207                                          __NFT_TABLE_F_WAS_AWAKEN)
1208
1209 static bool nft_table_pending_update(const struct nft_ctx *ctx)
1210 {
1211         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1212         struct nft_trans *trans;
1213
1214         if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1215                 return true;
1216
1217         list_for_each_entry(trans, &nft_net->commit_list, list) {
1218                 if (trans->ctx.table == ctx->table &&
1219                     ((trans->msg_type == NFT_MSG_NEWCHAIN &&
1220                       nft_trans_chain_update(trans)) ||
1221                      (trans->msg_type == NFT_MSG_DELCHAIN &&
1222                       nft_is_base_chain(trans->ctx.chain))))
1223                         return true;
1224         }
1225
1226         return false;
1227 }
1228
1229 static int nf_tables_updtable(struct nft_ctx *ctx)
1230 {
1231         struct nft_trans *trans;
1232         u32 flags;
1233         int ret;
1234
1235         if (!ctx->nla[NFTA_TABLE_FLAGS])
1236                 return 0;
1237
1238         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1239         if (flags & ~NFT_TABLE_F_MASK)
1240                 return -EOPNOTSUPP;
1241
1242         if (flags == (ctx->table->flags & NFT_TABLE_F_MASK))
1243                 return 0;
1244
1245         if ((nft_table_has_owner(ctx->table) &&
1246              !(flags & NFT_TABLE_F_OWNER)) ||
1247             (!nft_table_has_owner(ctx->table) &&
1248              flags & NFT_TABLE_F_OWNER))
1249                 return -EOPNOTSUPP;
1250
1251         /* No dormant off/on/off/on games in single transaction */
1252         if (nft_table_pending_update(ctx))
1253                 return -EINVAL;
1254
1255         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1256                                 sizeof(struct nft_trans_table));
1257         if (trans == NULL)
1258                 return -ENOMEM;
1259
1260         if ((flags & NFT_TABLE_F_DORMANT) &&
1261             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1262                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1263                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1264                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1265         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1266                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1267                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1268                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1269                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1270                         if (ret < 0)
1271                                 goto err_register_hooks;
1272
1273                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1274                 }
1275         }
1276
1277         nft_trans_table_update(trans) = true;
1278         nft_trans_commit_list_add_tail(ctx->net, trans);
1279
1280         return 0;
1281
1282 err_register_hooks:
1283         ctx->table->flags |= NFT_TABLE_F_DORMANT;
1284         nft_trans_destroy(trans);
1285         return ret;
1286 }
1287
1288 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1289 {
1290         const char *name = data;
1291
1292         return jhash(name, strlen(name), seed);
1293 }
1294
1295 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1296 {
1297         const struct nft_chain *chain = data;
1298
1299         return nft_chain_hash(chain->name, 0, seed);
1300 }
1301
1302 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1303                               const void *ptr)
1304 {
1305         const struct nft_chain *chain = ptr;
1306         const char *name = arg->key;
1307
1308         return strcmp(chain->name, name);
1309 }
1310
1311 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1312 {
1313         const struct nft_object_hash_key *k = data;
1314
1315         seed ^= hash_ptr(k->table, 32);
1316
1317         return jhash(k->name, strlen(k->name), seed);
1318 }
1319
1320 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1321 {
1322         const struct nft_object *obj = data;
1323
1324         return nft_objname_hash(&obj->key, 0, seed);
1325 }
1326
1327 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1328                                 const void *ptr)
1329 {
1330         const struct nft_object_hash_key *k = arg->key;
1331         const struct nft_object *obj = ptr;
1332
1333         if (obj->key.table != k->table)
1334                 return -1;
1335
1336         return strcmp(obj->key.name, k->name);
1337 }
1338
1339 static bool nft_supported_family(u8 family)
1340 {
1341         return false
1342 #ifdef CONFIG_NF_TABLES_INET
1343                 || family == NFPROTO_INET
1344 #endif
1345 #ifdef CONFIG_NF_TABLES_IPV4
1346                 || family == NFPROTO_IPV4
1347 #endif
1348 #ifdef CONFIG_NF_TABLES_ARP
1349                 || family == NFPROTO_ARP
1350 #endif
1351 #ifdef CONFIG_NF_TABLES_NETDEV
1352                 || family == NFPROTO_NETDEV
1353 #endif
1354 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1355                 || family == NFPROTO_BRIDGE
1356 #endif
1357 #ifdef CONFIG_NF_TABLES_IPV6
1358                 || family == NFPROTO_IPV6
1359 #endif
1360                 ;
1361 }
1362
1363 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1364                               const struct nlattr * const nla[])
1365 {
1366         struct nftables_pernet *nft_net = nft_pernet(info->net);
1367         struct netlink_ext_ack *extack = info->extack;
1368         u8 genmask = nft_genmask_next(info->net);
1369         u8 family = info->nfmsg->nfgen_family;
1370         struct net *net = info->net;
1371         const struct nlattr *attr;
1372         struct nft_table *table;
1373         struct nft_ctx ctx;
1374         u32 flags = 0;
1375         int err;
1376
1377         if (!nft_supported_family(family))
1378                 return -EOPNOTSUPP;
1379
1380         lockdep_assert_held(&nft_net->commit_mutex);
1381         attr = nla[NFTA_TABLE_NAME];
1382         table = nft_table_lookup(net, attr, family, genmask,
1383                                  NETLINK_CB(skb).portid);
1384         if (IS_ERR(table)) {
1385                 if (PTR_ERR(table) != -ENOENT)
1386                         return PTR_ERR(table);
1387         } else {
1388                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1389                         NL_SET_BAD_ATTR(extack, attr);
1390                         return -EEXIST;
1391                 }
1392                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1393                         return -EOPNOTSUPP;
1394
1395                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1396
1397                 return nf_tables_updtable(&ctx);
1398         }
1399
1400         if (nla[NFTA_TABLE_FLAGS]) {
1401                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1402                 if (flags & ~NFT_TABLE_F_MASK)
1403                         return -EOPNOTSUPP;
1404         }
1405
1406         err = -ENOMEM;
1407         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1408         if (table == NULL)
1409                 goto err_kzalloc;
1410
1411         table->validate_state = nft_net->validate_state;
1412         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1413         if (table->name == NULL)
1414                 goto err_strdup;
1415
1416         if (nla[NFTA_TABLE_USERDATA]) {
1417                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1418                 if (table->udata == NULL)
1419                         goto err_table_udata;
1420
1421                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1422         }
1423
1424         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1425         if (err)
1426                 goto err_chain_ht;
1427
1428         INIT_LIST_HEAD(&table->chains);
1429         INIT_LIST_HEAD(&table->sets);
1430         INIT_LIST_HEAD(&table->objects);
1431         INIT_LIST_HEAD(&table->flowtables);
1432         table->family = family;
1433         table->flags = flags;
1434         table->handle = ++nft_net->table_handle;
1435         if (table->flags & NFT_TABLE_F_OWNER)
1436                 table->nlpid = NETLINK_CB(skb).portid;
1437
1438         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1439         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1440         if (err < 0)
1441                 goto err_trans;
1442
1443         list_add_tail_rcu(&table->list, &nft_net->tables);
1444         return 0;
1445 err_trans:
1446         rhltable_destroy(&table->chains_ht);
1447 err_chain_ht:
1448         kfree(table->udata);
1449 err_table_udata:
1450         kfree(table->name);
1451 err_strdup:
1452         kfree(table);
1453 err_kzalloc:
1454         return err;
1455 }
1456
1457 static int nft_flush_table(struct nft_ctx *ctx)
1458 {
1459         struct nft_flowtable *flowtable, *nft;
1460         struct nft_chain *chain, *nc;
1461         struct nft_object *obj, *ne;
1462         struct nft_set *set, *ns;
1463         int err;
1464
1465         list_for_each_entry(chain, &ctx->table->chains, list) {
1466                 if (!nft_is_active_next(ctx->net, chain))
1467                         continue;
1468
1469                 if (nft_chain_binding(chain))
1470                         continue;
1471
1472                 ctx->chain = chain;
1473
1474                 err = nft_delrule_by_chain(ctx);
1475                 if (err < 0)
1476                         goto out;
1477         }
1478
1479         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1480                 if (!nft_is_active_next(ctx->net, set))
1481                         continue;
1482
1483                 if (nft_set_is_anonymous(set))
1484                         continue;
1485
1486                 err = nft_delset(ctx, set);
1487                 if (err < 0)
1488                         goto out;
1489         }
1490
1491         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1492                 if (!nft_is_active_next(ctx->net, flowtable))
1493                         continue;
1494
1495                 err = nft_delflowtable(ctx, flowtable);
1496                 if (err < 0)
1497                         goto out;
1498         }
1499
1500         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1501                 if (!nft_is_active_next(ctx->net, obj))
1502                         continue;
1503
1504                 err = nft_delobj(ctx, obj);
1505                 if (err < 0)
1506                         goto out;
1507         }
1508
1509         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1510                 if (!nft_is_active_next(ctx->net, chain))
1511                         continue;
1512
1513                 if (nft_chain_binding(chain))
1514                         continue;
1515
1516                 ctx->chain = chain;
1517
1518                 err = nft_delchain(ctx);
1519                 if (err < 0)
1520                         goto out;
1521         }
1522
1523         err = nft_deltable(ctx);
1524 out:
1525         return err;
1526 }
1527
1528 static int nft_flush(struct nft_ctx *ctx, int family)
1529 {
1530         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1531         const struct nlattr * const *nla = ctx->nla;
1532         struct nft_table *table, *nt;
1533         int err = 0;
1534
1535         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1536                 if (family != AF_UNSPEC && table->family != family)
1537                         continue;
1538
1539                 ctx->family = table->family;
1540
1541                 if (!nft_is_active_next(ctx->net, table))
1542                         continue;
1543
1544                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1545                         continue;
1546
1547                 if (nla[NFTA_TABLE_NAME] &&
1548                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1549                         continue;
1550
1551                 ctx->table = table;
1552
1553                 err = nft_flush_table(ctx);
1554                 if (err < 0)
1555                         goto out;
1556         }
1557 out:
1558         return err;
1559 }
1560
1561 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1562                               const struct nlattr * const nla[])
1563 {
1564         struct netlink_ext_ack *extack = info->extack;
1565         u8 genmask = nft_genmask_next(info->net);
1566         u8 family = info->nfmsg->nfgen_family;
1567         struct net *net = info->net;
1568         const struct nlattr *attr;
1569         struct nft_table *table;
1570         struct nft_ctx ctx;
1571
1572         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1573         if (family == AF_UNSPEC ||
1574             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1575                 return nft_flush(&ctx, family);
1576
1577         if (nla[NFTA_TABLE_HANDLE]) {
1578                 attr = nla[NFTA_TABLE_HANDLE];
1579                 table = nft_table_lookup_byhandle(net, attr, family, genmask,
1580                                                   NETLINK_CB(skb).portid);
1581         } else {
1582                 attr = nla[NFTA_TABLE_NAME];
1583                 table = nft_table_lookup(net, attr, family, genmask,
1584                                          NETLINK_CB(skb).portid);
1585         }
1586
1587         if (IS_ERR(table)) {
1588                 if (PTR_ERR(table) == -ENOENT &&
1589                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1590                         return 0;
1591
1592                 NL_SET_BAD_ATTR(extack, attr);
1593                 return PTR_ERR(table);
1594         }
1595
1596         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1597             table->use > 0)
1598                 return -EBUSY;
1599
1600         ctx.family = family;
1601         ctx.table = table;
1602
1603         return nft_flush_table(&ctx);
1604 }
1605
1606 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1607 {
1608         if (WARN_ON(ctx->table->use > 0))
1609                 return;
1610
1611         rhltable_destroy(&ctx->table->chains_ht);
1612         kfree(ctx->table->name);
1613         kfree(ctx->table->udata);
1614         kfree(ctx->table);
1615 }
1616
1617 void nft_register_chain_type(const struct nft_chain_type *ctype)
1618 {
1619         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1620         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1621                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1622                 return;
1623         }
1624         chain_type[ctype->family][ctype->type] = ctype;
1625         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1626 }
1627 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1628
1629 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1630 {
1631         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1632         chain_type[ctype->family][ctype->type] = NULL;
1633         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1634 }
1635 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1636
1637 /*
1638  * Chains
1639  */
1640
1641 static struct nft_chain *
1642 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1643 {
1644         struct nft_chain *chain;
1645
1646         list_for_each_entry(chain, &table->chains, list) {
1647                 if (chain->handle == handle &&
1648                     nft_active_genmask(chain, genmask))
1649                         return chain;
1650         }
1651
1652         return ERR_PTR(-ENOENT);
1653 }
1654
1655 static bool lockdep_commit_lock_is_held(const struct net *net)
1656 {
1657 #ifdef CONFIG_PROVE_LOCKING
1658         struct nftables_pernet *nft_net = nft_pernet(net);
1659
1660         return lockdep_is_held(&nft_net->commit_mutex);
1661 #else
1662         return true;
1663 #endif
1664 }
1665
1666 static struct nft_chain *nft_chain_lookup(struct net *net,
1667                                           struct nft_table *table,
1668                                           const struct nlattr *nla, u8 genmask)
1669 {
1670         char search[NFT_CHAIN_MAXNAMELEN + 1];
1671         struct rhlist_head *tmp, *list;
1672         struct nft_chain *chain;
1673
1674         if (nla == NULL)
1675                 return ERR_PTR(-EINVAL);
1676
1677         nla_strscpy(search, nla, sizeof(search));
1678
1679         WARN_ON(!rcu_read_lock_held() &&
1680                 !lockdep_commit_lock_is_held(net));
1681
1682         chain = ERR_PTR(-ENOENT);
1683         rcu_read_lock();
1684         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1685         if (!list)
1686                 goto out_unlock;
1687
1688         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1689                 if (nft_active_genmask(chain, genmask))
1690                         goto out_unlock;
1691         }
1692         chain = ERR_PTR(-ENOENT);
1693 out_unlock:
1694         rcu_read_unlock();
1695         return chain;
1696 }
1697
1698 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1699         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1700                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1701         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1702         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1703                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1704         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1705         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1706         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1707                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1708         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1709         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1710         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1711         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1712                                     .len = NFT_USERDATA_MAXLEN },
1713 };
1714
1715 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1716         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1717         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1718         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1719                                     .len = IFNAMSIZ - 1 },
1720 };
1721
1722 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1723 {
1724         struct nft_stats *cpu_stats, total;
1725         struct nlattr *nest;
1726         unsigned int seq;
1727         u64 pkts, bytes;
1728         int cpu;
1729
1730         if (!stats)
1731                 return 0;
1732
1733         memset(&total, 0, sizeof(total));
1734         for_each_possible_cpu(cpu) {
1735                 cpu_stats = per_cpu_ptr(stats, cpu);
1736                 do {
1737                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1738                         pkts = cpu_stats->pkts;
1739                         bytes = cpu_stats->bytes;
1740                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1741                 total.pkts += pkts;
1742                 total.bytes += bytes;
1743         }
1744         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1745         if (nest == NULL)
1746                 goto nla_put_failure;
1747
1748         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1749                          NFTA_COUNTER_PAD) ||
1750             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1751                          NFTA_COUNTER_PAD))
1752                 goto nla_put_failure;
1753
1754         nla_nest_end(skb, nest);
1755         return 0;
1756
1757 nla_put_failure:
1758         return -ENOSPC;
1759 }
1760
1761 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1762                                    const struct nft_base_chain *basechain,
1763                                    const struct list_head *hook_list)
1764 {
1765         const struct nf_hook_ops *ops = &basechain->ops;
1766         struct nft_hook *hook, *first = NULL;
1767         struct nlattr *nest, *nest_devs;
1768         int n = 0;
1769
1770         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1771         if (nest == NULL)
1772                 goto nla_put_failure;
1773         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1774                 goto nla_put_failure;
1775         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1776                 goto nla_put_failure;
1777
1778         if (nft_base_chain_netdev(family, ops->hooknum)) {
1779                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1780                 if (!nest_devs)
1781                         goto nla_put_failure;
1782
1783                 if (!hook_list)
1784                         hook_list = &basechain->hook_list;
1785
1786                 list_for_each_entry(hook, hook_list, list) {
1787                         if (!first)
1788                                 first = hook;
1789
1790                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1791                                            hook->ops.dev->name))
1792                                 goto nla_put_failure;
1793                         n++;
1794                 }
1795                 nla_nest_end(skb, nest_devs);
1796
1797                 if (n == 1 &&
1798                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1799                         goto nla_put_failure;
1800         }
1801         nla_nest_end(skb, nest);
1802
1803         return 0;
1804 nla_put_failure:
1805         return -1;
1806 }
1807
1808 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1809                                      u32 portid, u32 seq, int event, u32 flags,
1810                                      int family, const struct nft_table *table,
1811                                      const struct nft_chain *chain,
1812                                      const struct list_head *hook_list)
1813 {
1814         struct nlmsghdr *nlh;
1815
1816         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1817         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1818                            NFNETLINK_V0, nft_base_seq(net));
1819         if (!nlh)
1820                 goto nla_put_failure;
1821
1822         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1823             nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1824             nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1825                          NFTA_CHAIN_PAD))
1826                 goto nla_put_failure;
1827
1828         if (event == NFT_MSG_DELCHAIN && !hook_list) {
1829                 nlmsg_end(skb, nlh);
1830                 return 0;
1831         }
1832
1833         if (nft_is_base_chain(chain)) {
1834                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1835                 struct nft_stats __percpu *stats;
1836
1837                 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1838                         goto nla_put_failure;
1839
1840                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1841                                  htonl(basechain->policy)))
1842                         goto nla_put_failure;
1843
1844                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1845                         goto nla_put_failure;
1846
1847                 stats = rcu_dereference_check(basechain->stats,
1848                                               lockdep_commit_lock_is_held(net));
1849                 if (nft_dump_stats(skb, stats))
1850                         goto nla_put_failure;
1851         }
1852
1853         if (chain->flags &&
1854             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1855                 goto nla_put_failure;
1856
1857         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1858                 goto nla_put_failure;
1859
1860         if (chain->udata &&
1861             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1862                 goto nla_put_failure;
1863
1864         nlmsg_end(skb, nlh);
1865         return 0;
1866
1867 nla_put_failure:
1868         nlmsg_trim(skb, nlh);
1869         return -1;
1870 }
1871
1872 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1873                                    const struct list_head *hook_list)
1874 {
1875         struct nftables_pernet *nft_net;
1876         struct sk_buff *skb;
1877         u16 flags = 0;
1878         int err;
1879
1880         if (!ctx->report &&
1881             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1882                 return;
1883
1884         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1885         if (skb == NULL)
1886                 goto err;
1887
1888         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1889                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1890
1891         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1892                                         event, flags, ctx->family, ctx->table,
1893                                         ctx->chain, hook_list);
1894         if (err < 0) {
1895                 kfree_skb(skb);
1896                 goto err;
1897         }
1898
1899         nft_net = nft_pernet(ctx->net);
1900         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1901         return;
1902 err:
1903         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1904 }
1905
1906 static int nf_tables_dump_chains(struct sk_buff *skb,
1907                                  struct netlink_callback *cb)
1908 {
1909         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1910         unsigned int idx = 0, s_idx = cb->args[0];
1911         struct net *net = sock_net(skb->sk);
1912         int family = nfmsg->nfgen_family;
1913         struct nftables_pernet *nft_net;
1914         const struct nft_table *table;
1915         const struct nft_chain *chain;
1916
1917         rcu_read_lock();
1918         nft_net = nft_pernet(net);
1919         cb->seq = READ_ONCE(nft_net->base_seq);
1920
1921         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1922                 if (family != NFPROTO_UNSPEC && family != table->family)
1923                         continue;
1924
1925                 list_for_each_entry_rcu(chain, &table->chains, list) {
1926                         if (idx < s_idx)
1927                                 goto cont;
1928                         if (idx > s_idx)
1929                                 memset(&cb->args[1], 0,
1930                                        sizeof(cb->args) - sizeof(cb->args[0]));
1931                         if (!nft_is_active(net, chain))
1932                                 continue;
1933                         if (nf_tables_fill_chain_info(skb, net,
1934                                                       NETLINK_CB(cb->skb).portid,
1935                                                       cb->nlh->nlmsg_seq,
1936                                                       NFT_MSG_NEWCHAIN,
1937                                                       NLM_F_MULTI,
1938                                                       table->family, table,
1939                                                       chain, NULL) < 0)
1940                                 goto done;
1941
1942                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1943 cont:
1944                         idx++;
1945                 }
1946         }
1947 done:
1948         rcu_read_unlock();
1949         cb->args[0] = idx;
1950         return skb->len;
1951 }
1952
1953 /* called with rcu_read_lock held */
1954 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1955                               const struct nlattr * const nla[])
1956 {
1957         struct netlink_ext_ack *extack = info->extack;
1958         u8 genmask = nft_genmask_cur(info->net);
1959         u8 family = info->nfmsg->nfgen_family;
1960         const struct nft_chain *chain;
1961         struct net *net = info->net;
1962         struct nft_table *table;
1963         struct sk_buff *skb2;
1964         int err;
1965
1966         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1967                 struct netlink_dump_control c = {
1968                         .dump = nf_tables_dump_chains,
1969                         .module = THIS_MODULE,
1970                 };
1971
1972                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1973         }
1974
1975         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1976         if (IS_ERR(table)) {
1977                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1978                 return PTR_ERR(table);
1979         }
1980
1981         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1982         if (IS_ERR(chain)) {
1983                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1984                 return PTR_ERR(chain);
1985         }
1986
1987         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1988         if (!skb2)
1989                 return -ENOMEM;
1990
1991         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1992                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1993                                         0, family, table, chain, NULL);
1994         if (err < 0)
1995                 goto err_fill_chain_info;
1996
1997         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1998
1999 err_fill_chain_info:
2000         kfree_skb(skb2);
2001         return err;
2002 }
2003
2004 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
2005         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
2006         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
2007 };
2008
2009 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
2010 {
2011         struct nlattr *tb[NFTA_COUNTER_MAX+1];
2012         struct nft_stats __percpu *newstats;
2013         struct nft_stats *stats;
2014         int err;
2015
2016         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
2017                                           nft_counter_policy, NULL);
2018         if (err < 0)
2019                 return ERR_PTR(err);
2020
2021         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
2022                 return ERR_PTR(-EINVAL);
2023
2024         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
2025         if (newstats == NULL)
2026                 return ERR_PTR(-ENOMEM);
2027
2028         /* Restore old counters on this cpu, no problem. Per-cpu statistics
2029          * are not exposed to userspace.
2030          */
2031         preempt_disable();
2032         stats = this_cpu_ptr(newstats);
2033         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2034         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2035         preempt_enable();
2036
2037         return newstats;
2038 }
2039
2040 static void nft_chain_stats_replace(struct nft_trans *trans)
2041 {
2042         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2043
2044         if (!nft_trans_chain_stats(trans))
2045                 return;
2046
2047         nft_trans_chain_stats(trans) =
2048                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2049                                     lockdep_commit_lock_is_held(trans->ctx.net));
2050
2051         if (!nft_trans_chain_stats(trans))
2052                 static_branch_inc(&nft_counters_enabled);
2053 }
2054
2055 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2056 {
2057         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2058         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2059
2060         if (g0 != g1)
2061                 kvfree(g1);
2062         kvfree(g0);
2063
2064         /* should be NULL either via abort or via successful commit */
2065         WARN_ON_ONCE(chain->blob_next);
2066         kvfree(chain->blob_next);
2067 }
2068
2069 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2070 {
2071         struct nft_chain *chain = ctx->chain;
2072         struct nft_hook *hook, *next;
2073
2074         if (WARN_ON(chain->use > 0))
2075                 return;
2076
2077         /* no concurrent access possible anymore */
2078         nf_tables_chain_free_chain_rules(chain);
2079
2080         if (nft_is_base_chain(chain)) {
2081                 struct nft_base_chain *basechain = nft_base_chain(chain);
2082
2083                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2084                         list_for_each_entry_safe(hook, next,
2085                                                  &basechain->hook_list, list) {
2086                                 list_del_rcu(&hook->list);
2087                                 kfree_rcu(hook, rcu);
2088                         }
2089                 }
2090                 module_put(basechain->type->owner);
2091                 if (rcu_access_pointer(basechain->stats)) {
2092                         static_branch_dec(&nft_counters_enabled);
2093                         free_percpu(rcu_dereference_raw(basechain->stats));
2094                 }
2095                 kfree(chain->name);
2096                 kfree(chain->udata);
2097                 kfree(basechain);
2098         } else {
2099                 kfree(chain->name);
2100                 kfree(chain->udata);
2101                 kfree(chain);
2102         }
2103 }
2104
2105 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2106                                               const struct nlattr *attr)
2107 {
2108         struct net_device *dev;
2109         char ifname[IFNAMSIZ];
2110         struct nft_hook *hook;
2111         int err;
2112
2113         hook = kzalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2114         if (!hook) {
2115                 err = -ENOMEM;
2116                 goto err_hook_alloc;
2117         }
2118
2119         nla_strscpy(ifname, attr, IFNAMSIZ);
2120         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2121          * indirectly serializing all the other holders of the commit_mutex with
2122          * the rtnl_mutex.
2123          */
2124         dev = __dev_get_by_name(net, ifname);
2125         if (!dev) {
2126                 err = -ENOENT;
2127                 goto err_hook_dev;
2128         }
2129         hook->ops.dev = dev;
2130
2131         return hook;
2132
2133 err_hook_dev:
2134         kfree(hook);
2135 err_hook_alloc:
2136         return ERR_PTR(err);
2137 }
2138
2139 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2140                                            const struct nft_hook *this)
2141 {
2142         struct nft_hook *hook;
2143
2144         list_for_each_entry(hook, hook_list, list) {
2145                 if (this->ops.dev == hook->ops.dev)
2146                         return hook;
2147         }
2148
2149         return NULL;
2150 }
2151
2152 static int nf_tables_parse_netdev_hooks(struct net *net,
2153                                         const struct nlattr *attr,
2154                                         struct list_head *hook_list,
2155                                         struct netlink_ext_ack *extack)
2156 {
2157         struct nft_hook *hook, *next;
2158         const struct nlattr *tmp;
2159         int rem, n = 0, err;
2160
2161         nla_for_each_nested(tmp, attr, rem) {
2162                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2163                         err = -EINVAL;
2164                         goto err_hook;
2165                 }
2166
2167                 hook = nft_netdev_hook_alloc(net, tmp);
2168                 if (IS_ERR(hook)) {
2169                         NL_SET_BAD_ATTR(extack, tmp);
2170                         err = PTR_ERR(hook);
2171                         goto err_hook;
2172                 }
2173                 if (nft_hook_list_find(hook_list, hook)) {
2174                         NL_SET_BAD_ATTR(extack, tmp);
2175                         kfree(hook);
2176                         err = -EEXIST;
2177                         goto err_hook;
2178                 }
2179                 list_add_tail(&hook->list, hook_list);
2180                 n++;
2181
2182                 if (n == NFT_NETDEVICE_MAX) {
2183                         err = -EFBIG;
2184                         goto err_hook;
2185                 }
2186         }
2187
2188         return 0;
2189
2190 err_hook:
2191         list_for_each_entry_safe(hook, next, hook_list, list) {
2192                 list_del(&hook->list);
2193                 kfree(hook);
2194         }
2195         return err;
2196 }
2197
2198 struct nft_chain_hook {
2199         u32                             num;
2200         s32                             priority;
2201         const struct nft_chain_type     *type;
2202         struct list_head                list;
2203 };
2204
2205 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2206                                   struct list_head *hook_list,
2207                                   struct netlink_ext_ack *extack, u32 flags)
2208 {
2209         struct nft_hook *hook;
2210         int err;
2211
2212         if (tb[NFTA_HOOK_DEV]) {
2213                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2214                 if (IS_ERR(hook)) {
2215                         NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2216                         return PTR_ERR(hook);
2217                 }
2218
2219                 list_add_tail(&hook->list, hook_list);
2220         } else if (tb[NFTA_HOOK_DEVS]) {
2221                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2222                                                    hook_list, extack);
2223                 if (err < 0)
2224                         return err;
2225
2226         }
2227
2228         if (flags & NFT_CHAIN_HW_OFFLOAD &&
2229             list_empty(hook_list))
2230                 return -EINVAL;
2231
2232         return 0;
2233 }
2234
2235 static int nft_chain_parse_hook(struct net *net,
2236                                 struct nft_base_chain *basechain,
2237                                 const struct nlattr * const nla[],
2238                                 struct nft_chain_hook *hook, u8 family,
2239                                 u32 flags, struct netlink_ext_ack *extack)
2240 {
2241         struct nftables_pernet *nft_net = nft_pernet(net);
2242         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2243         const struct nft_chain_type *type;
2244         int err;
2245
2246         lockdep_assert_held(&nft_net->commit_mutex);
2247         lockdep_nfnl_nft_mutex_not_held();
2248
2249         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2250                                           nla[NFTA_CHAIN_HOOK],
2251                                           nft_hook_policy, NULL);
2252         if (err < 0)
2253                 return err;
2254
2255         if (!basechain) {
2256                 if (!ha[NFTA_HOOK_HOOKNUM] ||
2257                     !ha[NFTA_HOOK_PRIORITY]) {
2258                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2259                         return -ENOENT;
2260                 }
2261
2262                 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2263                 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2264
2265                 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2266                 if (!type)
2267                         return -EOPNOTSUPP;
2268
2269                 if (nla[NFTA_CHAIN_TYPE]) {
2270                         type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2271                                                            family, true);
2272                         if (IS_ERR(type)) {
2273                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2274                                 return PTR_ERR(type);
2275                         }
2276                 }
2277                 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2278                         return -EOPNOTSUPP;
2279
2280                 if (type->type == NFT_CHAIN_T_NAT &&
2281                     hook->priority <= NF_IP_PRI_CONNTRACK)
2282                         return -EOPNOTSUPP;
2283         } else {
2284                 if (ha[NFTA_HOOK_HOOKNUM]) {
2285                         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2286                         if (hook->num != basechain->ops.hooknum)
2287                                 return -EOPNOTSUPP;
2288                 }
2289                 if (ha[NFTA_HOOK_PRIORITY]) {
2290                         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2291                         if (hook->priority != basechain->ops.priority)
2292                                 return -EOPNOTSUPP;
2293                 }
2294
2295                 if (nla[NFTA_CHAIN_TYPE]) {
2296                         type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
2297                                                              family);
2298                         if (!type) {
2299                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2300                                 return -ENOENT;
2301                         }
2302                 } else {
2303                         type = basechain->type;
2304                 }
2305         }
2306
2307         if (!try_module_get(type->owner)) {
2308                 if (nla[NFTA_CHAIN_TYPE])
2309                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2310                 return -ENOENT;
2311         }
2312
2313         hook->type = type;
2314
2315         INIT_LIST_HEAD(&hook->list);
2316         if (nft_base_chain_netdev(family, hook->num)) {
2317                 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2318                 if (err < 0) {
2319                         module_put(type->owner);
2320                         return err;
2321                 }
2322         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2323                 module_put(type->owner);
2324                 return -EOPNOTSUPP;
2325         }
2326
2327         return 0;
2328 }
2329
2330 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2331 {
2332         struct nft_hook *h, *next;
2333
2334         list_for_each_entry_safe(h, next, &hook->list, list) {
2335                 list_del(&h->list);
2336                 kfree(h);
2337         }
2338         module_put(hook->type->owner);
2339 }
2340
2341 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2342 {
2343         struct nft_rule_dp_last *lrule;
2344
2345         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2346
2347         lrule = (struct nft_rule_dp_last *)ptr;
2348         lrule->end.is_last = 1;
2349         lrule->chain = chain;
2350         /* blob size does not include the trailer rule */
2351 }
2352
2353 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2354                                                          unsigned int size)
2355 {
2356         struct nft_rule_blob *blob;
2357
2358         if (size > INT_MAX)
2359                 return NULL;
2360
2361         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2362
2363         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2364         if (!blob)
2365                 return NULL;
2366
2367         blob->size = 0;
2368         nft_last_rule(chain, blob->data);
2369
2370         return blob;
2371 }
2372
2373 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2374                                     const struct nft_chain_hook *hook,
2375                                     struct nft_chain *chain)
2376 {
2377         ops->pf                 = family;
2378         ops->hooknum            = hook->num;
2379         ops->priority           = hook->priority;
2380         ops->priv               = chain;
2381         ops->hook               = hook->type->hooks[ops->hooknum];
2382         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2383 }
2384
2385 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2386                               struct nft_chain_hook *hook, u32 flags)
2387 {
2388         struct nft_chain *chain;
2389         struct nft_hook *h;
2390
2391         basechain->type = hook->type;
2392         INIT_LIST_HEAD(&basechain->hook_list);
2393         chain = &basechain->chain;
2394
2395         if (nft_base_chain_netdev(family, hook->num)) {
2396                 list_splice_init(&hook->list, &basechain->hook_list);
2397                 list_for_each_entry(h, &basechain->hook_list, list)
2398                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2399         }
2400         nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2401
2402         chain->flags |= NFT_CHAIN_BASE | flags;
2403         basechain->policy = NF_ACCEPT;
2404         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2405             !nft_chain_offload_support(basechain)) {
2406                 list_splice_init(&basechain->hook_list, &hook->list);
2407                 return -EOPNOTSUPP;
2408         }
2409
2410         flow_block_init(&basechain->flow_block);
2411
2412         return 0;
2413 }
2414
2415 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2416 {
2417         int err;
2418
2419         err = rhltable_insert_key(&table->chains_ht, chain->name,
2420                                   &chain->rhlhead, nft_chain_ht_params);
2421         if (err)
2422                 return err;
2423
2424         list_add_tail_rcu(&chain->list, &table->chains);
2425
2426         return 0;
2427 }
2428
2429 static u64 chain_id;
2430
2431 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2432                               u8 policy, u32 flags,
2433                               struct netlink_ext_ack *extack)
2434 {
2435         const struct nlattr * const *nla = ctx->nla;
2436         struct nft_table *table = ctx->table;
2437         struct nft_base_chain *basechain;
2438         struct net *net = ctx->net;
2439         char name[NFT_NAME_MAXLEN];
2440         struct nft_rule_blob *blob;
2441         struct nft_trans *trans;
2442         struct nft_chain *chain;
2443         int err;
2444
2445         if (nla[NFTA_CHAIN_HOOK]) {
2446                 struct nft_stats __percpu *stats = NULL;
2447                 struct nft_chain_hook hook = {};
2448
2449                 if (table->flags & __NFT_TABLE_F_UPDATE)
2450                         return -EINVAL;
2451
2452                 if (flags & NFT_CHAIN_BINDING)
2453                         return -EOPNOTSUPP;
2454
2455                 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2456                                            extack);
2457                 if (err < 0)
2458                         return err;
2459
2460                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2461                 if (basechain == NULL) {
2462                         nft_chain_release_hook(&hook);
2463                         return -ENOMEM;
2464                 }
2465                 chain = &basechain->chain;
2466
2467                 if (nla[NFTA_CHAIN_COUNTERS]) {
2468                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2469                         if (IS_ERR(stats)) {
2470                                 nft_chain_release_hook(&hook);
2471                                 kfree(basechain);
2472                                 return PTR_ERR(stats);
2473                         }
2474                         rcu_assign_pointer(basechain->stats, stats);
2475                 }
2476
2477                 err = nft_basechain_init(basechain, family, &hook, flags);
2478                 if (err < 0) {
2479                         nft_chain_release_hook(&hook);
2480                         kfree(basechain);
2481                         free_percpu(stats);
2482                         return err;
2483                 }
2484                 if (stats)
2485                         static_branch_inc(&nft_counters_enabled);
2486         } else {
2487                 if (flags & NFT_CHAIN_BASE)
2488                         return -EINVAL;
2489                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2490                         return -EOPNOTSUPP;
2491
2492                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2493                 if (chain == NULL)
2494                         return -ENOMEM;
2495
2496                 chain->flags = flags;
2497         }
2498         ctx->chain = chain;
2499
2500         INIT_LIST_HEAD(&chain->rules);
2501         chain->handle = nf_tables_alloc_handle(table);
2502         chain->table = table;
2503
2504         if (nla[NFTA_CHAIN_NAME]) {
2505                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2506         } else {
2507                 if (!(flags & NFT_CHAIN_BINDING)) {
2508                         err = -EINVAL;
2509                         goto err_destroy_chain;
2510                 }
2511
2512                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2513                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2514         }
2515
2516         if (!chain->name) {
2517                 err = -ENOMEM;
2518                 goto err_destroy_chain;
2519         }
2520
2521         if (nla[NFTA_CHAIN_USERDATA]) {
2522                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2523                 if (chain->udata == NULL) {
2524                         err = -ENOMEM;
2525                         goto err_destroy_chain;
2526                 }
2527                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2528         }
2529
2530         blob = nf_tables_chain_alloc_rules(chain, 0);
2531         if (!blob) {
2532                 err = -ENOMEM;
2533                 goto err_destroy_chain;
2534         }
2535
2536         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2537         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2538
2539         if (!nft_use_inc(&table->use)) {
2540                 err = -EMFILE;
2541                 goto err_destroy_chain;
2542         }
2543
2544         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2545         if (IS_ERR(trans)) {
2546                 err = PTR_ERR(trans);
2547                 goto err_trans;
2548         }
2549
2550         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2551         if (nft_is_base_chain(chain))
2552                 nft_trans_chain_policy(trans) = policy;
2553
2554         err = nft_chain_add(table, chain);
2555         if (err < 0)
2556                 goto err_chain_add;
2557
2558         /* This must be LAST to ensure no packets are walking over this chain. */
2559         err = nf_tables_register_hook(net, table, chain);
2560         if (err < 0)
2561                 goto err_register_hook;
2562
2563         return 0;
2564
2565 err_register_hook:
2566         nft_chain_del(chain);
2567 err_chain_add:
2568         nft_trans_destroy(trans);
2569 err_trans:
2570         nft_use_dec_restore(&table->use);
2571 err_destroy_chain:
2572         nf_tables_chain_destroy(ctx);
2573
2574         return err;
2575 }
2576
2577 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2578                               u32 flags, const struct nlattr *attr,
2579                               struct netlink_ext_ack *extack)
2580 {
2581         const struct nlattr * const *nla = ctx->nla;
2582         struct nft_base_chain *basechain = NULL;
2583         struct nft_table *table = ctx->table;
2584         struct nft_chain *chain = ctx->chain;
2585         struct nft_chain_hook hook = {};
2586         struct nft_stats *stats = NULL;
2587         struct nft_hook *h, *next;
2588         struct nf_hook_ops *ops;
2589         struct nft_trans *trans;
2590         bool unregister = false;
2591         int err;
2592
2593         if (chain->flags ^ flags)
2594                 return -EOPNOTSUPP;
2595
2596         INIT_LIST_HEAD(&hook.list);
2597
2598         if (nla[NFTA_CHAIN_HOOK]) {
2599                 if (!nft_is_base_chain(chain)) {
2600                         NL_SET_BAD_ATTR(extack, attr);
2601                         return -EEXIST;
2602                 }
2603
2604                 basechain = nft_base_chain(chain);
2605                 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2606                                            ctx->family, flags, extack);
2607                 if (err < 0)
2608                         return err;
2609
2610                 if (basechain->type != hook.type) {
2611                         nft_chain_release_hook(&hook);
2612                         NL_SET_BAD_ATTR(extack, attr);
2613                         return -EEXIST;
2614                 }
2615
2616                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2617                         list_for_each_entry_safe(h, next, &hook.list, list) {
2618                                 h->ops.pf       = basechain->ops.pf;
2619                                 h->ops.hooknum  = basechain->ops.hooknum;
2620                                 h->ops.priority = basechain->ops.priority;
2621                                 h->ops.priv     = basechain->ops.priv;
2622                                 h->ops.hook     = basechain->ops.hook;
2623
2624                                 if (nft_hook_list_find(&basechain->hook_list, h)) {
2625                                         list_del(&h->list);
2626                                         kfree(h);
2627                                 }
2628                         }
2629                 } else {
2630                         ops = &basechain->ops;
2631                         if (ops->hooknum != hook.num ||
2632                             ops->priority != hook.priority) {
2633                                 nft_chain_release_hook(&hook);
2634                                 NL_SET_BAD_ATTR(extack, attr);
2635                                 return -EEXIST;
2636                         }
2637                 }
2638         }
2639
2640         if (nla[NFTA_CHAIN_HANDLE] &&
2641             nla[NFTA_CHAIN_NAME]) {
2642                 struct nft_chain *chain2;
2643
2644                 chain2 = nft_chain_lookup(ctx->net, table,
2645                                           nla[NFTA_CHAIN_NAME], genmask);
2646                 if (!IS_ERR(chain2)) {
2647                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2648                         err = -EEXIST;
2649                         goto err_hooks;
2650                 }
2651         }
2652
2653         if (table->flags & __NFT_TABLE_F_UPDATE &&
2654             !list_empty(&hook.list)) {
2655                 NL_SET_BAD_ATTR(extack, attr);
2656                 err = -EOPNOTSUPP;
2657                 goto err_hooks;
2658         }
2659
2660         if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2661             nft_is_base_chain(chain) &&
2662             !list_empty(&hook.list)) {
2663                 basechain = nft_base_chain(chain);
2664                 ops = &basechain->ops;
2665
2666                 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2667                         err = nft_netdev_register_hooks(ctx->net, &hook.list);
2668                         if (err < 0)
2669                                 goto err_hooks;
2670                 }
2671         }
2672
2673         unregister = true;
2674
2675         if (nla[NFTA_CHAIN_COUNTERS]) {
2676                 if (!nft_is_base_chain(chain)) {
2677                         err = -EOPNOTSUPP;
2678                         goto err_hooks;
2679                 }
2680
2681                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2682                 if (IS_ERR(stats)) {
2683                         err = PTR_ERR(stats);
2684                         goto err_hooks;
2685                 }
2686         }
2687
2688         err = -ENOMEM;
2689         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2690                                 sizeof(struct nft_trans_chain));
2691         if (trans == NULL)
2692                 goto err_trans;
2693
2694         nft_trans_chain_stats(trans) = stats;
2695         nft_trans_chain_update(trans) = true;
2696
2697         if (nla[NFTA_CHAIN_POLICY])
2698                 nft_trans_chain_policy(trans) = policy;
2699         else
2700                 nft_trans_chain_policy(trans) = -1;
2701
2702         if (nla[NFTA_CHAIN_HANDLE] &&
2703             nla[NFTA_CHAIN_NAME]) {
2704                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2705                 struct nft_trans *tmp;
2706                 char *name;
2707
2708                 err = -ENOMEM;
2709                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2710                 if (!name)
2711                         goto err_trans;
2712
2713                 err = -EEXIST;
2714                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2715                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2716                             tmp->ctx.table == table &&
2717                             nft_trans_chain_update(tmp) &&
2718                             nft_trans_chain_name(tmp) &&
2719                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2720                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2721                                 kfree(name);
2722                                 goto err_trans;
2723                         }
2724                 }
2725
2726                 nft_trans_chain_name(trans) = name;
2727         }
2728
2729         nft_trans_basechain(trans) = basechain;
2730         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2731         list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2732         if (nla[NFTA_CHAIN_HOOK])
2733                 module_put(hook.type->owner);
2734
2735         nft_trans_commit_list_add_tail(ctx->net, trans);
2736
2737         return 0;
2738
2739 err_trans:
2740         free_percpu(stats);
2741         kfree(trans);
2742 err_hooks:
2743         if (nla[NFTA_CHAIN_HOOK]) {
2744                 list_for_each_entry_safe(h, next, &hook.list, list) {
2745                         if (unregister)
2746                                 nf_unregister_net_hook(ctx->net, &h->ops);
2747                         list_del(&h->list);
2748                         kfree_rcu(h, rcu);
2749                 }
2750                 module_put(hook.type->owner);
2751         }
2752
2753         return err;
2754 }
2755
2756 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2757                                                const struct nft_table *table,
2758                                                const struct nlattr *nla, u8 genmask)
2759 {
2760         struct nftables_pernet *nft_net = nft_pernet(net);
2761         u32 id = ntohl(nla_get_be32(nla));
2762         struct nft_trans *trans;
2763
2764         list_for_each_entry(trans, &nft_net->commit_list, list) {
2765                 struct nft_chain *chain = trans->ctx.chain;
2766
2767                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2768                     chain->table == table &&
2769                     id == nft_trans_chain_id(trans) &&
2770                     nft_active_genmask(chain, genmask))
2771                         return chain;
2772         }
2773         return ERR_PTR(-ENOENT);
2774 }
2775
2776 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2777                               const struct nlattr * const nla[])
2778 {
2779         struct nftables_pernet *nft_net = nft_pernet(info->net);
2780         struct netlink_ext_ack *extack = info->extack;
2781         u8 genmask = nft_genmask_next(info->net);
2782         u8 family = info->nfmsg->nfgen_family;
2783         struct nft_chain *chain = NULL;
2784         struct net *net = info->net;
2785         const struct nlattr *attr;
2786         struct nft_table *table;
2787         u8 policy = NF_ACCEPT;
2788         struct nft_ctx ctx;
2789         u64 handle = 0;
2790         u32 flags = 0;
2791
2792         lockdep_assert_held(&nft_net->commit_mutex);
2793
2794         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2795                                  NETLINK_CB(skb).portid);
2796         if (IS_ERR(table)) {
2797                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2798                 return PTR_ERR(table);
2799         }
2800
2801         chain = NULL;
2802         attr = nla[NFTA_CHAIN_NAME];
2803
2804         if (nla[NFTA_CHAIN_HANDLE]) {
2805                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2806                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2807                 if (IS_ERR(chain)) {
2808                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2809                         return PTR_ERR(chain);
2810                 }
2811                 attr = nla[NFTA_CHAIN_HANDLE];
2812         } else if (nla[NFTA_CHAIN_NAME]) {
2813                 chain = nft_chain_lookup(net, table, attr, genmask);
2814                 if (IS_ERR(chain)) {
2815                         if (PTR_ERR(chain) != -ENOENT) {
2816                                 NL_SET_BAD_ATTR(extack, attr);
2817                                 return PTR_ERR(chain);
2818                         }
2819                         chain = NULL;
2820                 }
2821         } else if (!nla[NFTA_CHAIN_ID]) {
2822                 return -EINVAL;
2823         }
2824
2825         if (nla[NFTA_CHAIN_POLICY]) {
2826                 if (chain != NULL &&
2827                     !nft_is_base_chain(chain)) {
2828                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2829                         return -EOPNOTSUPP;
2830                 }
2831
2832                 if (chain == NULL &&
2833                     nla[NFTA_CHAIN_HOOK] == NULL) {
2834                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2835                         return -EOPNOTSUPP;
2836                 }
2837
2838                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2839                 switch (policy) {
2840                 case NF_DROP:
2841                 case NF_ACCEPT:
2842                         break;
2843                 default:
2844                         return -EINVAL;
2845                 }
2846         }
2847
2848         if (nla[NFTA_CHAIN_FLAGS])
2849                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2850         else if (chain)
2851                 flags = chain->flags;
2852
2853         if (flags & ~NFT_CHAIN_FLAGS)
2854                 return -EOPNOTSUPP;
2855
2856         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2857
2858         if (chain != NULL) {
2859                 if (chain->flags & NFT_CHAIN_BINDING)
2860                         return -EINVAL;
2861
2862                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2863                         NL_SET_BAD_ATTR(extack, attr);
2864                         return -EEXIST;
2865                 }
2866                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2867                         return -EOPNOTSUPP;
2868
2869                 flags |= chain->flags & NFT_CHAIN_BASE;
2870                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2871                                           extack);
2872         }
2873
2874         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2875 }
2876
2877 static int nft_delchain_hook(struct nft_ctx *ctx,
2878                              struct nft_base_chain *basechain,
2879                              struct netlink_ext_ack *extack)
2880 {
2881         const struct nft_chain *chain = &basechain->chain;
2882         const struct nlattr * const *nla = ctx->nla;
2883         struct nft_chain_hook chain_hook = {};
2884         struct nft_hook *this, *hook;
2885         LIST_HEAD(chain_del_list);
2886         struct nft_trans *trans;
2887         int err;
2888
2889         if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
2890                 return -EOPNOTSUPP;
2891
2892         err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2893                                    ctx->family, chain->flags, extack);
2894         if (err < 0)
2895                 return err;
2896
2897         list_for_each_entry(this, &chain_hook.list, list) {
2898                 hook = nft_hook_list_find(&basechain->hook_list, this);
2899                 if (!hook) {
2900                         err = -ENOENT;
2901                         goto err_chain_del_hook;
2902                 }
2903                 list_move(&hook->list, &chain_del_list);
2904         }
2905
2906         trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2907                                 sizeof(struct nft_trans_chain));
2908         if (!trans) {
2909                 err = -ENOMEM;
2910                 goto err_chain_del_hook;
2911         }
2912
2913         nft_trans_basechain(trans) = basechain;
2914         nft_trans_chain_update(trans) = true;
2915         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2916         list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2917         nft_chain_release_hook(&chain_hook);
2918
2919         nft_trans_commit_list_add_tail(ctx->net, trans);
2920
2921         return 0;
2922
2923 err_chain_del_hook:
2924         list_splice(&chain_del_list, &basechain->hook_list);
2925         nft_chain_release_hook(&chain_hook);
2926
2927         return err;
2928 }
2929
2930 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2931                               const struct nlattr * const nla[])
2932 {
2933         struct netlink_ext_ack *extack = info->extack;
2934         u8 genmask = nft_genmask_next(info->net);
2935         u8 family = info->nfmsg->nfgen_family;
2936         struct net *net = info->net;
2937         const struct nlattr *attr;
2938         struct nft_table *table;
2939         struct nft_chain *chain;
2940         struct nft_rule *rule;
2941         struct nft_ctx ctx;
2942         u64 handle;
2943         u32 use;
2944         int err;
2945
2946         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2947                                  NETLINK_CB(skb).portid);
2948         if (IS_ERR(table)) {
2949                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2950                 return PTR_ERR(table);
2951         }
2952
2953         if (nla[NFTA_CHAIN_HANDLE]) {
2954                 attr = nla[NFTA_CHAIN_HANDLE];
2955                 handle = be64_to_cpu(nla_get_be64(attr));
2956                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2957         } else {
2958                 attr = nla[NFTA_CHAIN_NAME];
2959                 chain = nft_chain_lookup(net, table, attr, genmask);
2960         }
2961         if (IS_ERR(chain)) {
2962                 if (PTR_ERR(chain) == -ENOENT &&
2963                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2964                         return 0;
2965
2966                 NL_SET_BAD_ATTR(extack, attr);
2967                 return PTR_ERR(chain);
2968         }
2969
2970         if (nft_chain_binding(chain))
2971                 return -EOPNOTSUPP;
2972
2973         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2974
2975         if (nla[NFTA_CHAIN_HOOK]) {
2976                 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN ||
2977                     chain->flags & NFT_CHAIN_HW_OFFLOAD)
2978                         return -EOPNOTSUPP;
2979
2980                 if (nft_is_base_chain(chain)) {
2981                         struct nft_base_chain *basechain = nft_base_chain(chain);
2982
2983                         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2984                                 return nft_delchain_hook(&ctx, basechain, extack);
2985                 }
2986         }
2987
2988         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2989             chain->use > 0)
2990                 return -EBUSY;
2991
2992         use = chain->use;
2993         list_for_each_entry(rule, &chain->rules, list) {
2994                 if (!nft_is_active_next(net, rule))
2995                         continue;
2996                 use--;
2997
2998                 err = nft_delrule(&ctx, rule);
2999                 if (err < 0)
3000                         return err;
3001         }
3002
3003         /* There are rules and elements that are still holding references to us,
3004          * we cannot do a recursive removal in this case.
3005          */
3006         if (use > 0) {
3007                 NL_SET_BAD_ATTR(extack, attr);
3008                 return -EBUSY;
3009         }
3010
3011         return nft_delchain(&ctx);
3012 }
3013
3014 /*
3015  * Expressions
3016  */
3017
3018 /**
3019  *      nft_register_expr - register nf_tables expr type
3020  *      @type: expr type
3021  *
3022  *      Registers the expr type for use with nf_tables. Returns zero on
3023  *      success or a negative errno code otherwise.
3024  */
3025 int nft_register_expr(struct nft_expr_type *type)
3026 {
3027         if (WARN_ON_ONCE(type->maxattr > NFT_EXPR_MAXATTR))
3028                 return -ENOMEM;
3029
3030         nfnl_lock(NFNL_SUBSYS_NFTABLES);
3031         if (type->family == NFPROTO_UNSPEC)
3032                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
3033         else
3034                 list_add_rcu(&type->list, &nf_tables_expressions);
3035         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3036         return 0;
3037 }
3038 EXPORT_SYMBOL_GPL(nft_register_expr);
3039
3040 /**
3041  *      nft_unregister_expr - unregister nf_tables expr type
3042  *      @type: expr type
3043  *
3044  *      Unregisters the expr typefor use with nf_tables.
3045  */
3046 void nft_unregister_expr(struct nft_expr_type *type)
3047 {
3048         nfnl_lock(NFNL_SUBSYS_NFTABLES);
3049         list_del_rcu(&type->list);
3050         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3051 }
3052 EXPORT_SYMBOL_GPL(nft_unregister_expr);
3053
3054 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
3055                                                        struct nlattr *nla)
3056 {
3057         const struct nft_expr_type *type, *candidate = NULL;
3058
3059         list_for_each_entry_rcu(type, &nf_tables_expressions, list) {
3060                 if (!nla_strcmp(nla, type->name)) {
3061                         if (!type->family && !candidate)
3062                                 candidate = type;
3063                         else if (type->family == family)
3064                                 candidate = type;
3065                 }
3066         }
3067         return candidate;
3068 }
3069
3070 #ifdef CONFIG_MODULES
3071 static int nft_expr_type_request_module(struct net *net, u8 family,
3072                                         struct nlattr *nla)
3073 {
3074         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3075                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3076                 return -EAGAIN;
3077
3078         return 0;
3079 }
3080 #endif
3081
3082 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3083                                                      u8 family,
3084                                                      struct nlattr *nla)
3085 {
3086         const struct nft_expr_type *type;
3087
3088         if (nla == NULL)
3089                 return ERR_PTR(-EINVAL);
3090
3091         rcu_read_lock();
3092         type = __nft_expr_type_get(family, nla);
3093         if (type != NULL && try_module_get(type->owner)) {
3094                 rcu_read_unlock();
3095                 return type;
3096         }
3097         rcu_read_unlock();
3098
3099         lockdep_nfnl_nft_mutex_not_held();
3100 #ifdef CONFIG_MODULES
3101         if (type == NULL) {
3102                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3103                         return ERR_PTR(-EAGAIN);
3104
3105                 if (nft_request_module(net, "nft-expr-%.*s",
3106                                        nla_len(nla),
3107                                        (char *)nla_data(nla)) == -EAGAIN)
3108                         return ERR_PTR(-EAGAIN);
3109         }
3110 #endif
3111         return ERR_PTR(-ENOENT);
3112 }
3113
3114 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3115         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
3116                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
3117         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
3118 };
3119
3120 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3121                                     const struct nft_expr *expr, bool reset)
3122 {
3123         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3124                 goto nla_put_failure;
3125
3126         if (expr->ops->dump) {
3127                 struct nlattr *data = nla_nest_start_noflag(skb,
3128                                                             NFTA_EXPR_DATA);
3129                 if (data == NULL)
3130                         goto nla_put_failure;
3131                 if (expr->ops->dump(skb, expr, reset) < 0)
3132                         goto nla_put_failure;
3133                 nla_nest_end(skb, data);
3134         }
3135
3136         return skb->len;
3137
3138 nla_put_failure:
3139         return -1;
3140 };
3141
3142 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3143                   const struct nft_expr *expr, bool reset)
3144 {
3145         struct nlattr *nest;
3146
3147         nest = nla_nest_start_noflag(skb, attr);
3148         if (!nest)
3149                 goto nla_put_failure;
3150         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3151                 goto nla_put_failure;
3152         nla_nest_end(skb, nest);
3153         return 0;
3154
3155 nla_put_failure:
3156         return -1;
3157 }
3158
3159 struct nft_expr_info {
3160         const struct nft_expr_ops       *ops;
3161         const struct nlattr             *attr;
3162         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
3163 };
3164
3165 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3166                                 const struct nlattr *nla,
3167                                 struct nft_expr_info *info)
3168 {
3169         const struct nft_expr_type *type;
3170         const struct nft_expr_ops *ops;
3171         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3172         int err;
3173
3174         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3175                                           nft_expr_policy, NULL);
3176         if (err < 0)
3177                 return err;
3178
3179         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3180         if (IS_ERR(type))
3181                 return PTR_ERR(type);
3182
3183         if (tb[NFTA_EXPR_DATA]) {
3184                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3185                                                   tb[NFTA_EXPR_DATA],
3186                                                   type->policy, NULL);
3187                 if (err < 0)
3188                         goto err1;
3189         } else
3190                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3191
3192         if (type->select_ops != NULL) {
3193                 ops = type->select_ops(ctx,
3194                                        (const struct nlattr * const *)info->tb);
3195                 if (IS_ERR(ops)) {
3196                         err = PTR_ERR(ops);
3197 #ifdef CONFIG_MODULES
3198                         if (err == -EAGAIN)
3199                                 if (nft_expr_type_request_module(ctx->net,
3200                                                                  ctx->family,
3201                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
3202                                         err = -ENOENT;
3203 #endif
3204                         goto err1;
3205                 }
3206         } else
3207                 ops = type->ops;
3208
3209         info->attr = nla;
3210         info->ops = ops;
3211
3212         return 0;
3213
3214 err1:
3215         module_put(type->owner);
3216         return err;
3217 }
3218
3219 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3220                          struct nft_expr_info *info)
3221 {
3222         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3223         const struct nft_expr_type *type;
3224         int err;
3225
3226         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3227                                           nft_expr_policy, NULL);
3228         if (err < 0)
3229                 return err;
3230
3231         if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3232                 return -EINVAL;
3233
3234         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3235         if (!type)
3236                 return -ENOENT;
3237
3238         if (!type->inner_ops)
3239                 return -EOPNOTSUPP;
3240
3241         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3242                                           tb[NFTA_EXPR_DATA],
3243                                           type->policy, NULL);
3244         if (err < 0)
3245                 goto err_nla_parse;
3246
3247         info->attr = nla;
3248         info->ops = type->inner_ops;
3249
3250         return 0;
3251
3252 err_nla_parse:
3253         return err;
3254 }
3255
3256 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3257                              const struct nft_expr_info *expr_info,
3258                              struct nft_expr *expr)
3259 {
3260         const struct nft_expr_ops *ops = expr_info->ops;
3261         int err;
3262
3263         expr->ops = ops;
3264         if (ops->init) {
3265                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3266                 if (err < 0)
3267                         goto err1;
3268         }
3269
3270         return 0;
3271 err1:
3272         expr->ops = NULL;
3273         return err;
3274 }
3275
3276 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3277                                    struct nft_expr *expr)
3278 {
3279         const struct nft_expr_type *type = expr->ops->type;
3280
3281         if (expr->ops->destroy)
3282                 expr->ops->destroy(ctx, expr);
3283         module_put(type->owner);
3284 }
3285
3286 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3287                                       const struct nlattr *nla)
3288 {
3289         struct nft_expr_info expr_info;
3290         struct nft_expr *expr;
3291         struct module *owner;
3292         int err;
3293
3294         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3295         if (err < 0)
3296                 goto err_expr_parse;
3297
3298         err = -EOPNOTSUPP;
3299         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3300                 goto err_expr_stateful;
3301
3302         err = -ENOMEM;
3303         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3304         if (expr == NULL)
3305                 goto err_expr_stateful;
3306
3307         err = nf_tables_newexpr(ctx, &expr_info, expr);
3308         if (err < 0)
3309                 goto err_expr_new;
3310
3311         return expr;
3312 err_expr_new:
3313         kfree(expr);
3314 err_expr_stateful:
3315         owner = expr_info.ops->type->owner;
3316         if (expr_info.ops->type->release_ops)
3317                 expr_info.ops->type->release_ops(expr_info.ops);
3318
3319         module_put(owner);
3320 err_expr_parse:
3321         return ERR_PTR(err);
3322 }
3323
3324 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3325 {
3326         int err;
3327
3328         if (WARN_ON_ONCE(!src->ops->clone))
3329                 return -EINVAL;
3330
3331         dst->ops = src->ops;
3332         err = src->ops->clone(dst, src);
3333         if (err < 0)
3334                 return err;
3335
3336         __module_get(src->ops->type->owner);
3337
3338         return 0;
3339 }
3340
3341 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3342 {
3343         nf_tables_expr_destroy(ctx, expr);
3344         kfree(expr);
3345 }
3346
3347 /*
3348  * Rules
3349  */
3350
3351 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3352                                           u64 handle)
3353 {
3354         struct nft_rule *rule;
3355
3356         // FIXME: this sucks
3357         list_for_each_entry_rcu(rule, &chain->rules, list) {
3358                 if (handle == rule->handle)
3359                         return rule;
3360         }
3361
3362         return ERR_PTR(-ENOENT);
3363 }
3364
3365 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3366                                         const struct nlattr *nla)
3367 {
3368         if (nla == NULL)
3369                 return ERR_PTR(-EINVAL);
3370
3371         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3372 }
3373
3374 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3375         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3376                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3377         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3378                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3379         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3380         [NFTA_RULE_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
3381         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3382         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3383         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3384                                     .len = NFT_USERDATA_MAXLEN },
3385         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3386         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3387         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3388 };
3389
3390 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3391                                     u32 portid, u32 seq, int event,
3392                                     u32 flags, int family,
3393                                     const struct nft_table *table,
3394                                     const struct nft_chain *chain,
3395                                     const struct nft_rule *rule, u64 handle,
3396                                     bool reset)
3397 {
3398         struct nlmsghdr *nlh;
3399         const struct nft_expr *expr, *next;
3400         struct nlattr *list;
3401         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3402
3403         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3404                            nft_base_seq(net));
3405         if (!nlh)
3406                 goto nla_put_failure;
3407
3408         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3409                 goto nla_put_failure;
3410         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3411                 goto nla_put_failure;
3412         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3413                          NFTA_RULE_PAD))
3414                 goto nla_put_failure;
3415
3416         if (event != NFT_MSG_DELRULE && handle) {
3417                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3418                                  NFTA_RULE_PAD))
3419                         goto nla_put_failure;
3420         }
3421
3422         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3423                 nft_flow_rule_stats(chain, rule);
3424
3425         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3426         if (list == NULL)
3427                 goto nla_put_failure;
3428         nft_rule_for_each_expr(expr, next, rule) {
3429                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3430                         goto nla_put_failure;
3431         }
3432         nla_nest_end(skb, list);
3433
3434         if (rule->udata) {
3435                 struct nft_userdata *udata = nft_userdata(rule);
3436                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3437                             udata->data) < 0)
3438                         goto nla_put_failure;
3439         }
3440
3441         nlmsg_end(skb, nlh);
3442         return 0;
3443
3444 nla_put_failure:
3445         nlmsg_trim(skb, nlh);
3446         return -1;
3447 }
3448
3449 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3450                                   const struct nft_rule *rule, int event)
3451 {
3452         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3453         const struct nft_rule *prule;
3454         struct sk_buff *skb;
3455         u64 handle = 0;
3456         u16 flags = 0;
3457         int err;
3458
3459         if (!ctx->report &&
3460             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3461                 return;
3462
3463         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3464         if (skb == NULL)
3465                 goto err;
3466
3467         if (event == NFT_MSG_NEWRULE &&
3468             !list_is_first(&rule->list, &ctx->chain->rules) &&
3469             !list_is_last(&rule->list, &ctx->chain->rules)) {
3470                 prule = list_prev_entry(rule, list);
3471                 handle = prule->handle;
3472         }
3473         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3474                 flags |= NLM_F_APPEND;
3475         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3476                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3477
3478         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3479                                        event, flags, ctx->family, ctx->table,
3480                                        ctx->chain, rule, handle, false);
3481         if (err < 0) {
3482                 kfree_skb(skb);
3483                 goto err;
3484         }
3485
3486         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3487         return;
3488 err:
3489         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3490 }
3491
3492 static void audit_log_rule_reset(const struct nft_table *table,
3493                                  unsigned int base_seq,
3494                                  unsigned int nentries)
3495 {
3496         char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3497                               table->name, base_seq);
3498
3499         audit_log_nfcfg(buf, table->family, nentries,
3500                         AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3501         kfree(buf);
3502 }
3503
3504 struct nft_rule_dump_ctx {
3505         unsigned int s_idx;
3506         char *table;
3507         char *chain;
3508         bool reset;
3509 };
3510
3511 static int __nf_tables_dump_rules(struct sk_buff *skb,
3512                                   unsigned int *idx,
3513                                   struct netlink_callback *cb,
3514                                   const struct nft_table *table,
3515                                   const struct nft_chain *chain)
3516 {
3517         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3518         struct net *net = sock_net(skb->sk);
3519         const struct nft_rule *rule, *prule;
3520         unsigned int entries = 0;
3521         int ret = 0;
3522         u64 handle;
3523
3524         prule = NULL;
3525         list_for_each_entry_rcu(rule, &chain->rules, list) {
3526                 if (!nft_is_active(net, rule))
3527                         goto cont_skip;
3528                 if (*idx < ctx->s_idx)
3529                         goto cont;
3530                 if (prule)
3531                         handle = prule->handle;
3532                 else
3533                         handle = 0;
3534
3535                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3536                                         cb->nlh->nlmsg_seq,
3537                                         NFT_MSG_NEWRULE,
3538                                         NLM_F_MULTI | NLM_F_APPEND,
3539                                         table->family,
3540                                         table, chain, rule, handle, ctx->reset) < 0) {
3541                         ret = 1;
3542                         break;
3543                 }
3544                 entries++;
3545                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3546 cont:
3547                 prule = rule;
3548 cont_skip:
3549                 (*idx)++;
3550         }
3551
3552         if (ctx->reset && entries)
3553                 audit_log_rule_reset(table, cb->seq, entries);
3554
3555         return ret;
3556 }
3557
3558 static int nf_tables_dump_rules(struct sk_buff *skb,
3559                                 struct netlink_callback *cb)
3560 {
3561         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3562         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3563         struct nft_table *table;
3564         const struct nft_chain *chain;
3565         unsigned int idx = 0;
3566         struct net *net = sock_net(skb->sk);
3567         int family = nfmsg->nfgen_family;
3568         struct nftables_pernet *nft_net;
3569
3570         rcu_read_lock();
3571         nft_net = nft_pernet(net);
3572         cb->seq = READ_ONCE(nft_net->base_seq);
3573
3574         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3575                 if (family != NFPROTO_UNSPEC && family != table->family)
3576                         continue;
3577
3578                 if (ctx->table && strcmp(ctx->table, table->name) != 0)
3579                         continue;
3580
3581                 if (ctx->table && ctx->chain) {
3582                         struct rhlist_head *list, *tmp;
3583
3584                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3585                                                nft_chain_ht_params);
3586                         if (!list)
3587                                 goto done;
3588
3589                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3590                                 if (!nft_is_active(net, chain))
3591                                         continue;
3592                                 __nf_tables_dump_rules(skb, &idx,
3593                                                        cb, table, chain);
3594                                 break;
3595                         }
3596                         goto done;
3597                 }
3598
3599                 list_for_each_entry_rcu(chain, &table->chains, list) {
3600                         if (__nf_tables_dump_rules(skb, &idx,
3601                                                    cb, table, chain))
3602                                 goto done;
3603                 }
3604
3605                 if (ctx->table)
3606                         break;
3607         }
3608 done:
3609         rcu_read_unlock();
3610
3611         ctx->s_idx = idx;
3612         return skb->len;
3613 }
3614
3615 static int nf_tables_dumpreset_rules(struct sk_buff *skb,
3616                                      struct netlink_callback *cb)
3617 {
3618         struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
3619         int ret;
3620
3621         /* Mutex is held is to prevent that two concurrent dump-and-reset calls
3622          * do not underrun counters and quotas. The commit_mutex is used for
3623          * the lack a better lock, this is not transaction path.
3624          */
3625         mutex_lock(&nft_net->commit_mutex);
3626         ret = nf_tables_dump_rules(skb, cb);
3627         mutex_unlock(&nft_net->commit_mutex);
3628
3629         return ret;
3630 }
3631
3632 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3633 {
3634         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3635         const struct nlattr * const *nla = cb->data;
3636
3637         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
3638
3639         if (nla[NFTA_RULE_TABLE]) {
3640                 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], GFP_ATOMIC);
3641                 if (!ctx->table)
3642                         return -ENOMEM;
3643         }
3644         if (nla[NFTA_RULE_CHAIN]) {
3645                 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], GFP_ATOMIC);
3646                 if (!ctx->chain) {
3647                         kfree(ctx->table);
3648                         return -ENOMEM;
3649                 }
3650         }
3651         return 0;
3652 }
3653
3654 static int nf_tables_dumpreset_rules_start(struct netlink_callback *cb)
3655 {
3656         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3657
3658         ctx->reset = true;
3659
3660         return nf_tables_dump_rules_start(cb);
3661 }
3662
3663 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3664 {
3665         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3666
3667         kfree(ctx->table);
3668         kfree(ctx->chain);
3669         return 0;
3670 }
3671
3672 /* called with rcu_read_lock held */
3673 static struct sk_buff *
3674 nf_tables_getrule_single(u32 portid, const struct nfnl_info *info,
3675                          const struct nlattr * const nla[], bool reset)
3676 {
3677         struct netlink_ext_ack *extack = info->extack;
3678         u8 genmask = nft_genmask_cur(info->net);
3679         u8 family = info->nfmsg->nfgen_family;
3680         const struct nft_chain *chain;
3681         const struct nft_rule *rule;
3682         struct net *net = info->net;
3683         struct nft_table *table;
3684         struct sk_buff *skb2;
3685         int err;
3686
3687         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3688         if (IS_ERR(table)) {
3689                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3690                 return ERR_CAST(table);
3691         }
3692
3693         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3694         if (IS_ERR(chain)) {
3695                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3696                 return ERR_CAST(chain);
3697         }
3698
3699         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3700         if (IS_ERR(rule)) {
3701                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3702                 return ERR_CAST(rule);
3703         }
3704
3705         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3706         if (!skb2)
3707                 return ERR_PTR(-ENOMEM);
3708
3709         err = nf_tables_fill_rule_info(skb2, net, portid,
3710                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3711                                        family, table, chain, rule, 0, reset);
3712         if (err < 0) {
3713                 kfree_skb(skb2);
3714                 return ERR_PTR(err);
3715         }
3716
3717         return skb2;
3718 }
3719
3720 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3721                              const struct nlattr * const nla[])
3722 {
3723         u32 portid = NETLINK_CB(skb).portid;
3724         struct net *net = info->net;
3725         struct sk_buff *skb2;
3726
3727         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3728                 struct netlink_dump_control c = {
3729                         .start= nf_tables_dump_rules_start,
3730                         .dump = nf_tables_dump_rules,
3731                         .done = nf_tables_dump_rules_done,
3732                         .module = THIS_MODULE,
3733                         .data = (void *)nla,
3734                 };
3735
3736                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3737         }
3738
3739         skb2 = nf_tables_getrule_single(portid, info, nla, false);
3740         if (IS_ERR(skb2))
3741                 return PTR_ERR(skb2);
3742
3743         return nfnetlink_unicast(skb2, net, portid);
3744 }
3745
3746 static int nf_tables_getrule_reset(struct sk_buff *skb,
3747                                    const struct nfnl_info *info,
3748                                    const struct nlattr * const nla[])
3749 {
3750         struct nftables_pernet *nft_net = nft_pernet(info->net);
3751         u32 portid = NETLINK_CB(skb).portid;
3752         struct net *net = info->net;
3753         struct sk_buff *skb2;
3754         char *buf;
3755
3756         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3757                 struct netlink_dump_control c = {
3758                         .start= nf_tables_dumpreset_rules_start,
3759                         .dump = nf_tables_dumpreset_rules,
3760                         .done = nf_tables_dump_rules_done,
3761                         .module = THIS_MODULE,
3762                         .data = (void *)nla,
3763                 };
3764
3765                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3766         }
3767
3768         if (!try_module_get(THIS_MODULE))
3769                 return -EINVAL;
3770         rcu_read_unlock();
3771         mutex_lock(&nft_net->commit_mutex);
3772         skb2 = nf_tables_getrule_single(portid, info, nla, true);
3773         mutex_unlock(&nft_net->commit_mutex);
3774         rcu_read_lock();
3775         module_put(THIS_MODULE);
3776
3777         if (IS_ERR(skb2))
3778                 return PTR_ERR(skb2);
3779
3780         buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
3781                         nla_len(nla[NFTA_RULE_TABLE]),
3782                         (char *)nla_data(nla[NFTA_RULE_TABLE]),
3783                         nft_net->base_seq);
3784         audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
3785                         AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3786         kfree(buf);
3787
3788         return nfnetlink_unicast(skb2, net, portid);
3789 }
3790
3791 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3792 {
3793         struct nft_expr *expr, *next;
3794
3795         /*
3796          * Careful: some expressions might not be initialized in case this
3797          * is called on error from nf_tables_newrule().
3798          */
3799         expr = nft_expr_first(rule);
3800         while (nft_expr_more(rule, expr)) {
3801                 next = nft_expr_next(expr);
3802                 nf_tables_expr_destroy(ctx, expr);
3803                 expr = next;
3804         }
3805         kfree(rule);
3806 }
3807
3808 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3809 {
3810         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3811         nf_tables_rule_destroy(ctx, rule);
3812 }
3813
3814 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3815 {
3816         struct nft_expr *expr, *last;
3817         const struct nft_data *data;
3818         struct nft_rule *rule;
3819         int err;
3820
3821         if (ctx->level == NFT_JUMP_STACK_SIZE)
3822                 return -EMLINK;
3823
3824         list_for_each_entry(rule, &chain->rules, list) {
3825                 if (fatal_signal_pending(current))
3826                         return -EINTR;
3827
3828                 if (!nft_is_active_next(ctx->net, rule))
3829                         continue;
3830
3831                 nft_rule_for_each_expr(expr, last, rule) {
3832                         if (!expr->ops->validate)
3833                                 continue;
3834
3835                         err = expr->ops->validate(ctx, expr, &data);
3836                         if (err < 0)
3837                                 return err;
3838                 }
3839         }
3840
3841         return 0;
3842 }
3843 EXPORT_SYMBOL_GPL(nft_chain_validate);
3844
3845 static int nft_table_validate(struct net *net, const struct nft_table *table)
3846 {
3847         struct nft_chain *chain;
3848         struct nft_ctx ctx = {
3849                 .net    = net,
3850                 .family = table->family,
3851         };
3852         int err;
3853
3854         list_for_each_entry(chain, &table->chains, list) {
3855                 if (!nft_is_base_chain(chain))
3856                         continue;
3857
3858                 ctx.chain = chain;
3859                 err = nft_chain_validate(&ctx, chain);
3860                 if (err < 0)
3861                         return err;
3862
3863                 cond_resched();
3864         }
3865
3866         return 0;
3867 }
3868
3869 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3870                          const struct nft_set_iter *iter,
3871                          struct nft_elem_priv *elem_priv)
3872 {
3873         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
3874         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3875         const struct nft_data *data;
3876         int err;
3877
3878         if (!nft_set_elem_active(ext, iter->genmask))
3879                 return 0;
3880
3881         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3882             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3883                 return 0;
3884
3885         data = nft_set_ext_data(ext);
3886         switch (data->verdict.code) {
3887         case NFT_JUMP:
3888         case NFT_GOTO:
3889                 pctx->level++;
3890                 err = nft_chain_validate(ctx, data->verdict.chain);
3891                 if (err < 0)
3892                         return err;
3893                 pctx->level--;
3894                 break;
3895         default:
3896                 break;
3897         }
3898
3899         return 0;
3900 }
3901
3902 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3903 {
3904         struct nft_set_iter dummy_iter = {
3905                 .genmask        = nft_genmask_next(ctx->net),
3906         };
3907         struct nft_set_elem_catchall *catchall;
3908
3909         struct nft_set_ext *ext;
3910         int ret = 0;
3911
3912         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3913                 ext = nft_set_elem_ext(set, catchall->elem);
3914                 if (!nft_set_elem_active(ext, dummy_iter.genmask))
3915                         continue;
3916
3917                 ret = nft_setelem_validate(ctx, set, &dummy_iter, catchall->elem);
3918                 if (ret < 0)
3919                         return ret;
3920         }
3921
3922         return ret;
3923 }
3924
3925 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3926                                              const struct nft_chain *chain,
3927                                              const struct nlattr *nla);
3928
3929 #define NFT_RULE_MAXEXPRS       128
3930
3931 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3932                              const struct nlattr * const nla[])
3933 {
3934         struct nftables_pernet *nft_net = nft_pernet(info->net);
3935         struct netlink_ext_ack *extack = info->extack;
3936         unsigned int size, i, n, ulen = 0, usize = 0;
3937         u8 genmask = nft_genmask_next(info->net);
3938         struct nft_rule *rule, *old_rule = NULL;
3939         struct nft_expr_info *expr_info = NULL;
3940         u8 family = info->nfmsg->nfgen_family;
3941         struct nft_flow_rule *flow = NULL;
3942         struct net *net = info->net;
3943         struct nft_userdata *udata;
3944         struct nft_table *table;
3945         struct nft_chain *chain;
3946         struct nft_trans *trans;
3947         u64 handle, pos_handle;
3948         struct nft_expr *expr;
3949         struct nft_ctx ctx;
3950         struct nlattr *tmp;
3951         int err, rem;
3952
3953         lockdep_assert_held(&nft_net->commit_mutex);
3954
3955         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3956                                  NETLINK_CB(skb).portid);
3957         if (IS_ERR(table)) {
3958                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3959                 return PTR_ERR(table);
3960         }
3961
3962         if (nla[NFTA_RULE_CHAIN]) {
3963                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3964                                          genmask);
3965                 if (IS_ERR(chain)) {
3966                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3967                         return PTR_ERR(chain);
3968                 }
3969
3970         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3971                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3972                                               genmask);
3973                 if (IS_ERR(chain)) {
3974                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3975                         return PTR_ERR(chain);
3976                 }
3977         } else {
3978                 return -EINVAL;
3979         }
3980
3981         if (nft_chain_is_bound(chain))
3982                 return -EOPNOTSUPP;
3983
3984         if (nla[NFTA_RULE_HANDLE]) {
3985                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3986                 rule = __nft_rule_lookup(chain, handle);
3987                 if (IS_ERR(rule)) {
3988                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3989                         return PTR_ERR(rule);
3990                 }
3991
3992                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3993                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3994                         return -EEXIST;
3995                 }
3996                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3997                         old_rule = rule;
3998                 else
3999                         return -EOPNOTSUPP;
4000         } else {
4001                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
4002                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
4003                         return -EINVAL;
4004                 handle = nf_tables_alloc_handle(table);
4005
4006                 if (nla[NFTA_RULE_POSITION]) {
4007                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
4008                         old_rule = __nft_rule_lookup(chain, pos_handle);
4009                         if (IS_ERR(old_rule)) {
4010                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
4011                                 return PTR_ERR(old_rule);
4012                         }
4013                 } else if (nla[NFTA_RULE_POSITION_ID]) {
4014                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
4015                         if (IS_ERR(old_rule)) {
4016                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
4017                                 return PTR_ERR(old_rule);
4018                         }
4019                 }
4020         }
4021
4022         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4023
4024         n = 0;
4025         size = 0;
4026         if (nla[NFTA_RULE_EXPRESSIONS]) {
4027                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
4028                                            sizeof(struct nft_expr_info),
4029                                            GFP_KERNEL);
4030                 if (!expr_info)
4031                         return -ENOMEM;
4032
4033                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
4034                         err = -EINVAL;
4035                         if (nla_type(tmp) != NFTA_LIST_ELEM)
4036                                 goto err_release_expr;
4037                         if (n == NFT_RULE_MAXEXPRS)
4038                                 goto err_release_expr;
4039                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
4040                         if (err < 0) {
4041                                 NL_SET_BAD_ATTR(extack, tmp);
4042                                 goto err_release_expr;
4043                         }
4044                         size += expr_info[n].ops->size;
4045                         n++;
4046                 }
4047         }
4048         /* Check for overflow of dlen field */
4049         err = -EFBIG;
4050         if (size >= 1 << 12)
4051                 goto err_release_expr;
4052
4053         if (nla[NFTA_RULE_USERDATA]) {
4054                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
4055                 if (ulen > 0)
4056                         usize = sizeof(struct nft_userdata) + ulen;
4057         }
4058
4059         err = -ENOMEM;
4060         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
4061         if (rule == NULL)
4062                 goto err_release_expr;
4063
4064         nft_activate_next(net, rule);
4065
4066         rule->handle = handle;
4067         rule->dlen   = size;
4068         rule->udata  = ulen ? 1 : 0;
4069
4070         if (ulen) {
4071                 udata = nft_userdata(rule);
4072                 udata->len = ulen - 1;
4073                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
4074         }
4075
4076         expr = nft_expr_first(rule);
4077         for (i = 0; i < n; i++) {
4078                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
4079                 if (err < 0) {
4080                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
4081                         goto err_release_rule;
4082                 }
4083
4084                 if (expr_info[i].ops->validate)
4085                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
4086
4087                 expr_info[i].ops = NULL;
4088                 expr = nft_expr_next(expr);
4089         }
4090
4091         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
4092                 flow = nft_flow_rule_create(net, rule);
4093                 if (IS_ERR(flow)) {
4094                         err = PTR_ERR(flow);
4095                         goto err_release_rule;
4096                 }
4097         }
4098
4099         if (!nft_use_inc(&chain->use)) {
4100                 err = -EMFILE;
4101                 goto err_release_rule;
4102         }
4103
4104         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
4105                 if (nft_chain_binding(chain)) {
4106                         err = -EOPNOTSUPP;
4107                         goto err_destroy_flow_rule;
4108                 }
4109
4110                 err = nft_delrule(&ctx, old_rule);
4111                 if (err < 0)
4112                         goto err_destroy_flow_rule;
4113
4114                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4115                 if (trans == NULL) {
4116                         err = -ENOMEM;
4117                         goto err_destroy_flow_rule;
4118                 }
4119                 list_add_tail_rcu(&rule->list, &old_rule->list);
4120         } else {
4121                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4122                 if (!trans) {
4123                         err = -ENOMEM;
4124                         goto err_destroy_flow_rule;
4125                 }
4126
4127                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4128                         if (old_rule)
4129                                 list_add_rcu(&rule->list, &old_rule->list);
4130                         else
4131                                 list_add_tail_rcu(&rule->list, &chain->rules);
4132                  } else {
4133                         if (old_rule)
4134                                 list_add_tail_rcu(&rule->list, &old_rule->list);
4135                         else
4136                                 list_add_rcu(&rule->list, &chain->rules);
4137                 }
4138         }
4139         kvfree(expr_info);
4140
4141         if (flow)
4142                 nft_trans_flow_rule(trans) = flow;
4143
4144         if (table->validate_state == NFT_VALIDATE_DO)
4145                 return nft_table_validate(net, table);
4146
4147         return 0;
4148
4149 err_destroy_flow_rule:
4150         nft_use_dec_restore(&chain->use);
4151         if (flow)
4152                 nft_flow_rule_destroy(flow);
4153 err_release_rule:
4154         nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4155         nf_tables_rule_destroy(&ctx, rule);
4156 err_release_expr:
4157         for (i = 0; i < n; i++) {
4158                 if (expr_info[i].ops) {
4159                         module_put(expr_info[i].ops->type->owner);
4160                         if (expr_info[i].ops->type->release_ops)
4161                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4162                 }
4163         }
4164         kvfree(expr_info);
4165
4166         return err;
4167 }
4168
4169 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4170                                              const struct nft_chain *chain,
4171                                              const struct nlattr *nla)
4172 {
4173         struct nftables_pernet *nft_net = nft_pernet(net);
4174         u32 id = ntohl(nla_get_be32(nla));
4175         struct nft_trans *trans;
4176
4177         list_for_each_entry(trans, &nft_net->commit_list, list) {
4178                 if (trans->msg_type == NFT_MSG_NEWRULE &&
4179                     trans->ctx.chain == chain &&
4180                     id == nft_trans_rule_id(trans))
4181                         return nft_trans_rule(trans);
4182         }
4183         return ERR_PTR(-ENOENT);
4184 }
4185
4186 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4187                              const struct nlattr * const nla[])
4188 {
4189         struct netlink_ext_ack *extack = info->extack;
4190         u8 genmask = nft_genmask_next(info->net);
4191         u8 family = info->nfmsg->nfgen_family;
4192         struct nft_chain *chain = NULL;
4193         struct net *net = info->net;
4194         struct nft_table *table;
4195         struct nft_rule *rule;
4196         struct nft_ctx ctx;
4197         int err = 0;
4198
4199         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4200                                  NETLINK_CB(skb).portid);
4201         if (IS_ERR(table)) {
4202                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4203                 return PTR_ERR(table);
4204         }
4205
4206         if (nla[NFTA_RULE_CHAIN]) {
4207                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4208                                          genmask);
4209                 if (IS_ERR(chain)) {
4210                         if (PTR_ERR(chain) == -ENOENT &&
4211                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4212                                 return 0;
4213
4214                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4215                         return PTR_ERR(chain);
4216                 }
4217                 if (nft_chain_binding(chain))
4218                         return -EOPNOTSUPP;
4219         }
4220
4221         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4222
4223         if (chain) {
4224                 if (nla[NFTA_RULE_HANDLE]) {
4225                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4226                         if (IS_ERR(rule)) {
4227                                 if (PTR_ERR(rule) == -ENOENT &&
4228                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4229                                         return 0;
4230
4231                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4232                                 return PTR_ERR(rule);
4233                         }
4234
4235                         err = nft_delrule(&ctx, rule);
4236                 } else if (nla[NFTA_RULE_ID]) {
4237                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4238                         if (IS_ERR(rule)) {
4239                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4240                                 return PTR_ERR(rule);
4241                         }
4242
4243                         err = nft_delrule(&ctx, rule);
4244                 } else {
4245                         err = nft_delrule_by_chain(&ctx);
4246                 }
4247         } else {
4248                 list_for_each_entry(chain, &table->chains, list) {
4249                         if (!nft_is_active_next(net, chain))
4250                                 continue;
4251                         if (nft_chain_binding(chain))
4252                                 continue;
4253
4254                         ctx.chain = chain;
4255                         err = nft_delrule_by_chain(&ctx);
4256                         if (err < 0)
4257                                 break;
4258                 }
4259         }
4260
4261         return err;
4262 }
4263
4264 /*
4265  * Sets
4266  */
4267 static const struct nft_set_type *nft_set_types[] = {
4268         &nft_set_hash_fast_type,
4269         &nft_set_hash_type,
4270         &nft_set_rhash_type,
4271         &nft_set_bitmap_type,
4272         &nft_set_rbtree_type,
4273 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4274         &nft_set_pipapo_avx2_type,
4275 #endif
4276         &nft_set_pipapo_type,
4277 };
4278
4279 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
4280                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4281                                  NFT_SET_EVAL)
4282
4283 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4284 {
4285         return (flags & type->features) == (flags & NFT_SET_FEATURES);
4286 }
4287
4288 /*
4289  * Select a set implementation based on the data characteristics and the
4290  * given policy. The total memory use might not be known if no size is
4291  * given, in that case the amount of memory per element is used.
4292  */
4293 static const struct nft_set_ops *
4294 nft_select_set_ops(const struct nft_ctx *ctx,
4295                    const struct nlattr * const nla[],
4296                    const struct nft_set_desc *desc)
4297 {
4298         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4299         const struct nft_set_ops *ops, *bops;
4300         struct nft_set_estimate est, best;
4301         const struct nft_set_type *type;
4302         u32 flags = 0;
4303         int i;
4304
4305         lockdep_assert_held(&nft_net->commit_mutex);
4306         lockdep_nfnl_nft_mutex_not_held();
4307
4308         if (nla[NFTA_SET_FLAGS] != NULL)
4309                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4310
4311         bops        = NULL;
4312         best.size   = ~0;
4313         best.lookup = ~0;
4314         best.space  = ~0;
4315
4316         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4317                 type = nft_set_types[i];
4318                 ops = &type->ops;
4319
4320                 if (!nft_set_ops_candidate(type, flags))
4321                         continue;
4322                 if (!ops->estimate(desc, flags, &est))
4323                         continue;
4324
4325                 switch (desc->policy) {
4326                 case NFT_SET_POL_PERFORMANCE:
4327                         if (est.lookup < best.lookup)
4328                                 break;
4329                         if (est.lookup == best.lookup &&
4330                             est.space < best.space)
4331                                 break;
4332                         continue;
4333                 case NFT_SET_POL_MEMORY:
4334                         if (!desc->size) {
4335                                 if (est.space < best.space)
4336                                         break;
4337                                 if (est.space == best.space &&
4338                                     est.lookup < best.lookup)
4339                                         break;
4340                         } else if (est.size < best.size || !bops) {
4341                                 break;
4342                         }
4343                         continue;
4344                 default:
4345                         break;
4346                 }
4347
4348                 bops = ops;
4349                 best = est;
4350         }
4351
4352         if (bops != NULL)
4353                 return bops;
4354
4355         return ERR_PTR(-EOPNOTSUPP);
4356 }
4357
4358 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4359         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4360                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4361         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4362                                             .len = NFT_SET_MAXNAMELEN - 1 },
4363         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4364         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4365         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4366         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4367         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4368         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4369         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4370         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4371         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4372         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4373         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4374                                             .len  = NFT_USERDATA_MAXLEN },
4375         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4376         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4377         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4378         [NFTA_SET_EXPRESSIONS]          = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
4379 };
4380
4381 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4382         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4383 };
4384
4385 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4386         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4387         [NFTA_SET_DESC_CONCAT]          = NLA_POLICY_NESTED_ARRAY(nft_concat_policy),
4388 };
4389
4390 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4391                                       const struct nlattr *nla, u8 genmask)
4392 {
4393         struct nft_set *set;
4394
4395         if (nla == NULL)
4396                 return ERR_PTR(-EINVAL);
4397
4398         list_for_each_entry_rcu(set, &table->sets, list) {
4399                 if (!nla_strcmp(nla, set->name) &&
4400                     nft_active_genmask(set, genmask))
4401                         return set;
4402         }
4403         return ERR_PTR(-ENOENT);
4404 }
4405
4406 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4407                                                const struct nlattr *nla,
4408                                                u8 genmask)
4409 {
4410         struct nft_set *set;
4411
4412         list_for_each_entry(set, &table->sets, list) {
4413                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4414                     nft_active_genmask(set, genmask))
4415                         return set;
4416         }
4417         return ERR_PTR(-ENOENT);
4418 }
4419
4420 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4421                                            const struct nft_table *table,
4422                                            const struct nlattr *nla, u8 genmask)
4423 {
4424         struct nftables_pernet *nft_net = nft_pernet(net);
4425         u32 id = ntohl(nla_get_be32(nla));
4426         struct nft_trans *trans;
4427
4428         list_for_each_entry(trans, &nft_net->commit_list, list) {
4429                 if (trans->msg_type == NFT_MSG_NEWSET) {
4430                         struct nft_set *set = nft_trans_set(trans);
4431
4432                         if (id == nft_trans_set_id(trans) &&
4433                             set->table == table &&
4434                             nft_active_genmask(set, genmask))
4435                                 return set;
4436                 }
4437         }
4438         return ERR_PTR(-ENOENT);
4439 }
4440
4441 struct nft_set *nft_set_lookup_global(const struct net *net,
4442                                       const struct nft_table *table,
4443                                       const struct nlattr *nla_set_name,
4444                                       const struct nlattr *nla_set_id,
4445                                       u8 genmask)
4446 {
4447         struct nft_set *set;
4448
4449         set = nft_set_lookup(table, nla_set_name, genmask);
4450         if (IS_ERR(set)) {
4451                 if (!nla_set_id)
4452                         return set;
4453
4454                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4455         }
4456         return set;
4457 }
4458 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4459
4460 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4461                                     const char *name)
4462 {
4463         const struct nft_set *i;
4464         const char *p;
4465         unsigned long *inuse;
4466         unsigned int n = 0, min = 0;
4467
4468         p = strchr(name, '%');
4469         if (p != NULL) {
4470                 if (p[1] != 'd' || strchr(p + 2, '%'))
4471                         return -EINVAL;
4472
4473                 if (strnlen(name, NFT_SET_MAX_ANONLEN) >= NFT_SET_MAX_ANONLEN)
4474                         return -EINVAL;
4475
4476                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4477                 if (inuse == NULL)
4478                         return -ENOMEM;
4479 cont:
4480                 list_for_each_entry(i, &ctx->table->sets, list) {
4481                         int tmp;
4482
4483                         if (!nft_is_active_next(ctx->net, i))
4484                                 continue;
4485                         if (!sscanf(i->name, name, &tmp))
4486                                 continue;
4487                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4488                                 continue;
4489
4490                         set_bit(tmp - min, inuse);
4491                 }
4492
4493                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4494                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4495                         min += BITS_PER_BYTE * PAGE_SIZE;
4496                         memset(inuse, 0, PAGE_SIZE);
4497                         goto cont;
4498                 }
4499                 free_page((unsigned long)inuse);
4500         }
4501
4502         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4503         if (!set->name)
4504                 return -ENOMEM;
4505
4506         list_for_each_entry(i, &ctx->table->sets, list) {
4507                 if (!nft_is_active_next(ctx->net, i))
4508                         continue;
4509                 if (!strcmp(set->name, i->name)) {
4510                         kfree(set->name);
4511                         set->name = NULL;
4512                         return -ENFILE;
4513                 }
4514         }
4515         return 0;
4516 }
4517
4518 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4519 {
4520         u64 ms = be64_to_cpu(nla_get_be64(nla));
4521         u64 max = (u64)(~((u64)0));
4522
4523         max = div_u64(max, NSEC_PER_MSEC);
4524         if (ms >= max)
4525                 return -ERANGE;
4526
4527         ms *= NSEC_PER_MSEC;
4528         *result = nsecs_to_jiffies64(ms);
4529         return 0;
4530 }
4531
4532 __be64 nf_jiffies64_to_msecs(u64 input)
4533 {
4534         return cpu_to_be64(jiffies64_to_msecs(input));
4535 }
4536
4537 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4538                                      const struct nft_set *set)
4539 {
4540         struct nlattr *concat, *field;
4541         int i;
4542
4543         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4544         if (!concat)
4545                 return -ENOMEM;
4546
4547         for (i = 0; i < set->field_count; i++) {
4548                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4549                 if (!field)
4550                         return -ENOMEM;
4551
4552                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4553                                  htonl(set->field_len[i])))
4554                         return -ENOMEM;
4555
4556                 nla_nest_end(skb, field);
4557         }
4558
4559         nla_nest_end(skb, concat);
4560
4561         return 0;
4562 }
4563
4564 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4565                               const struct nft_set *set, u16 event, u16 flags)
4566 {
4567         u64 timeout = READ_ONCE(set->timeout);
4568         u32 gc_int = READ_ONCE(set->gc_int);
4569         u32 portid = ctx->portid;
4570         struct nlmsghdr *nlh;
4571         struct nlattr *nest;
4572         u32 seq = ctx->seq;
4573         int i;
4574
4575         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4576         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4577                            NFNETLINK_V0, nft_base_seq(ctx->net));
4578         if (!nlh)
4579                 goto nla_put_failure;
4580
4581         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4582                 goto nla_put_failure;
4583         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4584                 goto nla_put_failure;
4585         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4586                          NFTA_SET_PAD))
4587                 goto nla_put_failure;
4588
4589         if (event == NFT_MSG_DELSET) {
4590                 nlmsg_end(skb, nlh);
4591                 return 0;
4592         }
4593
4594         if (set->flags != 0)
4595                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4596                         goto nla_put_failure;
4597
4598         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4599                 goto nla_put_failure;
4600         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4601                 goto nla_put_failure;
4602         if (set->flags & NFT_SET_MAP) {
4603                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4604                         goto nla_put_failure;
4605                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4606                         goto nla_put_failure;
4607         }
4608         if (set->flags & NFT_SET_OBJECT &&
4609             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4610                 goto nla_put_failure;
4611
4612         if (timeout &&
4613             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4614                          nf_jiffies64_to_msecs(timeout),
4615                          NFTA_SET_PAD))
4616                 goto nla_put_failure;
4617         if (gc_int &&
4618             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4619                 goto nla_put_failure;
4620
4621         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4622                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4623                         goto nla_put_failure;
4624         }
4625
4626         if (set->udata &&
4627             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4628                 goto nla_put_failure;
4629
4630         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4631         if (!nest)
4632                 goto nla_put_failure;
4633         if (set->size &&
4634             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4635                 goto nla_put_failure;
4636
4637         if (set->field_count > 1 &&
4638             nf_tables_fill_set_concat(skb, set))
4639                 goto nla_put_failure;
4640
4641         nla_nest_end(skb, nest);
4642
4643         if (set->num_exprs == 1) {
4644                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4645                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4646                         goto nla_put_failure;
4647
4648                 nla_nest_end(skb, nest);
4649         } else if (set->num_exprs > 1) {
4650                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4651                 if (nest == NULL)
4652                         goto nla_put_failure;
4653
4654                 for (i = 0; i < set->num_exprs; i++) {
4655                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4656                                           set->exprs[i], false) < 0)
4657                                 goto nla_put_failure;
4658                 }
4659                 nla_nest_end(skb, nest);
4660         }
4661
4662         nlmsg_end(skb, nlh);
4663         return 0;
4664
4665 nla_put_failure:
4666         nlmsg_trim(skb, nlh);
4667         return -1;
4668 }
4669
4670 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4671                                  const struct nft_set *set, int event,
4672                                  gfp_t gfp_flags)
4673 {
4674         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4675         u32 portid = ctx->portid;
4676         struct sk_buff *skb;
4677         u16 flags = 0;
4678         int err;
4679
4680         if (!ctx->report &&
4681             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4682                 return;
4683
4684         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4685         if (skb == NULL)
4686                 goto err;
4687
4688         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4689                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4690
4691         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4692         if (err < 0) {
4693                 kfree_skb(skb);
4694                 goto err;
4695         }
4696
4697         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4698         return;
4699 err:
4700         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4701 }
4702
4703 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4704 {
4705         const struct nft_set *set;
4706         unsigned int idx, s_idx = cb->args[0];
4707         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4708         struct net *net = sock_net(skb->sk);
4709         struct nft_ctx *ctx = cb->data, ctx_set;
4710         struct nftables_pernet *nft_net;
4711
4712         if (cb->args[1])
4713                 return skb->len;
4714
4715         rcu_read_lock();
4716         nft_net = nft_pernet(net);
4717         cb->seq = READ_ONCE(nft_net->base_seq);
4718
4719         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4720                 if (ctx->family != NFPROTO_UNSPEC &&
4721                     ctx->family != table->family)
4722                         continue;
4723
4724                 if (ctx->table && ctx->table != table)
4725                         continue;
4726
4727                 if (cur_table) {
4728                         if (cur_table != table)
4729                                 continue;
4730
4731                         cur_table = NULL;
4732                 }
4733                 idx = 0;
4734                 list_for_each_entry_rcu(set, &table->sets, list) {
4735                         if (idx < s_idx)
4736                                 goto cont;
4737                         if (!nft_is_active(net, set))
4738                                 goto cont;
4739
4740                         ctx_set = *ctx;
4741                         ctx_set.table = table;
4742                         ctx_set.family = table->family;
4743
4744                         if (nf_tables_fill_set(skb, &ctx_set, set,
4745                                                NFT_MSG_NEWSET,
4746                                                NLM_F_MULTI) < 0) {
4747                                 cb->args[0] = idx;
4748                                 cb->args[2] = (unsigned long) table;
4749                                 goto done;
4750                         }
4751                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4752 cont:
4753                         idx++;
4754                 }
4755                 if (s_idx)
4756                         s_idx = 0;
4757         }
4758         cb->args[1] = 1;
4759 done:
4760         rcu_read_unlock();
4761         return skb->len;
4762 }
4763
4764 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4765 {
4766         struct nft_ctx *ctx_dump = NULL;
4767
4768         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4769         if (ctx_dump == NULL)
4770                 return -ENOMEM;
4771
4772         cb->data = ctx_dump;
4773         return 0;
4774 }
4775
4776 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4777 {
4778         kfree(cb->data);
4779         return 0;
4780 }
4781
4782 /* called with rcu_read_lock held */
4783 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4784                             const struct nlattr * const nla[])
4785 {
4786         struct netlink_ext_ack *extack = info->extack;
4787         u8 genmask = nft_genmask_cur(info->net);
4788         u8 family = info->nfmsg->nfgen_family;
4789         struct nft_table *table = NULL;
4790         struct net *net = info->net;
4791         const struct nft_set *set;
4792         struct sk_buff *skb2;
4793         struct nft_ctx ctx;
4794         int err;
4795
4796         if (nla[NFTA_SET_TABLE]) {
4797                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4798                                          genmask, 0);
4799                 if (IS_ERR(table)) {
4800                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4801                         return PTR_ERR(table);
4802                 }
4803         }
4804
4805         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4806
4807         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4808                 struct netlink_dump_control c = {
4809                         .start = nf_tables_dump_sets_start,
4810                         .dump = nf_tables_dump_sets,
4811                         .done = nf_tables_dump_sets_done,
4812                         .data = &ctx,
4813                         .module = THIS_MODULE,
4814                 };
4815
4816                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4817         }
4818
4819         /* Only accept unspec with dump */
4820         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4821                 return -EAFNOSUPPORT;
4822         if (!nla[NFTA_SET_TABLE])
4823                 return -EINVAL;
4824
4825         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4826         if (IS_ERR(set)) {
4827                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4828                 return PTR_ERR(set);
4829         }
4830
4831         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4832         if (skb2 == NULL)
4833                 return -ENOMEM;
4834
4835         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4836         if (err < 0)
4837                 goto err_fill_set_info;
4838
4839         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4840
4841 err_fill_set_info:
4842         kfree_skb(skb2);
4843         return err;
4844 }
4845
4846 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4847                                      struct nft_set_desc *desc)
4848 {
4849         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4850         u32 len;
4851         int err;
4852
4853         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4854                 return -E2BIG;
4855
4856         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4857                                           nft_concat_policy, NULL);
4858         if (err < 0)
4859                 return err;
4860
4861         if (!tb[NFTA_SET_FIELD_LEN])
4862                 return -EINVAL;
4863
4864         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4865         if (!len || len > U8_MAX)
4866                 return -EINVAL;
4867
4868         desc->field_len[desc->field_count++] = len;
4869
4870         return 0;
4871 }
4872
4873 static int nft_set_desc_concat(struct nft_set_desc *desc,
4874                                const struct nlattr *nla)
4875 {
4876         u32 num_regs = 0, key_num_regs = 0;
4877         struct nlattr *attr;
4878         int rem, err, i;
4879
4880         nla_for_each_nested(attr, nla, rem) {
4881                 if (nla_type(attr) != NFTA_LIST_ELEM)
4882                         return -EINVAL;
4883
4884                 err = nft_set_desc_concat_parse(attr, desc);
4885                 if (err < 0)
4886                         return err;
4887         }
4888
4889         for (i = 0; i < desc->field_count; i++)
4890                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4891
4892         key_num_regs = DIV_ROUND_UP(desc->klen, sizeof(u32));
4893         if (key_num_regs != num_regs)
4894                 return -EINVAL;
4895
4896         if (num_regs > NFT_REG32_COUNT)
4897                 return -E2BIG;
4898
4899         return 0;
4900 }
4901
4902 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4903                                     const struct nlattr *nla)
4904 {
4905         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4906         int err;
4907
4908         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4909                                           nft_set_desc_policy, NULL);
4910         if (err < 0)
4911                 return err;
4912
4913         if (da[NFTA_SET_DESC_SIZE] != NULL)
4914                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4915         if (da[NFTA_SET_DESC_CONCAT])
4916                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4917
4918         return err;
4919 }
4920
4921 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4922                               const struct nlattr * const *nla,
4923                               struct nft_expr **exprs, int *num_exprs,
4924                               u32 flags)
4925 {
4926         struct nft_expr *expr;
4927         int err, i;
4928
4929         if (nla[NFTA_SET_EXPR]) {
4930                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4931                 if (IS_ERR(expr)) {
4932                         err = PTR_ERR(expr);
4933                         goto err_set_expr_alloc;
4934                 }
4935                 exprs[0] = expr;
4936                 (*num_exprs)++;
4937         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4938                 struct nlattr *tmp;
4939                 int left;
4940
4941                 if (!(flags & NFT_SET_EXPR)) {
4942                         err = -EINVAL;
4943                         goto err_set_expr_alloc;
4944                 }
4945                 i = 0;
4946                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4947                         if (i == NFT_SET_EXPR_MAX) {
4948                                 err = -E2BIG;
4949                                 goto err_set_expr_alloc;
4950                         }
4951                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4952                                 err = -EINVAL;
4953                                 goto err_set_expr_alloc;
4954                         }
4955                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4956                         if (IS_ERR(expr)) {
4957                                 err = PTR_ERR(expr);
4958                                 goto err_set_expr_alloc;
4959                         }
4960                         exprs[i++] = expr;
4961                         (*num_exprs)++;
4962                 }
4963         }
4964
4965         return 0;
4966
4967 err_set_expr_alloc:
4968         for (i = 0; i < *num_exprs; i++)
4969                 nft_expr_destroy(ctx, exprs[i]);
4970
4971         return err;
4972 }
4973
4974 static bool nft_set_is_same(const struct nft_set *set,
4975                             const struct nft_set_desc *desc,
4976                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4977 {
4978         int i;
4979
4980         if (set->ktype != desc->ktype ||
4981             set->dtype != desc->dtype ||
4982             set->flags != flags ||
4983             set->klen != desc->klen ||
4984             set->dlen != desc->dlen ||
4985             set->field_count != desc->field_count ||
4986             set->num_exprs != num_exprs)
4987                 return false;
4988
4989         for (i = 0; i < desc->field_count; i++) {
4990                 if (set->field_len[i] != desc->field_len[i])
4991                         return false;
4992         }
4993
4994         for (i = 0; i < num_exprs; i++) {
4995                 if (set->exprs[i]->ops != exprs[i]->ops)
4996                         return false;
4997         }
4998
4999         return true;
5000 }
5001
5002 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
5003                             const struct nlattr * const nla[])
5004 {
5005         struct netlink_ext_ack *extack = info->extack;
5006         u8 genmask = nft_genmask_next(info->net);
5007         u8 family = info->nfmsg->nfgen_family;
5008         const struct nft_set_ops *ops;
5009         struct net *net = info->net;
5010         struct nft_set_desc desc;
5011         struct nft_table *table;
5012         unsigned char *udata;
5013         struct nft_set *set;
5014         struct nft_ctx ctx;
5015         size_t alloc_size;
5016         int num_exprs = 0;
5017         char *name;
5018         int err, i;
5019         u16 udlen;
5020         u32 flags;
5021         u64 size;
5022
5023         if (nla[NFTA_SET_TABLE] == NULL ||
5024             nla[NFTA_SET_NAME] == NULL ||
5025             nla[NFTA_SET_KEY_LEN] == NULL ||
5026             nla[NFTA_SET_ID] == NULL)
5027                 return -EINVAL;
5028
5029         memset(&desc, 0, sizeof(desc));
5030
5031         desc.ktype = NFT_DATA_VALUE;
5032         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
5033                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
5034                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
5035                         return -EINVAL;
5036         }
5037
5038         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
5039         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
5040                 return -EINVAL;
5041
5042         flags = 0;
5043         if (nla[NFTA_SET_FLAGS] != NULL) {
5044                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
5045                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
5046                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
5047                               NFT_SET_MAP | NFT_SET_EVAL |
5048                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
5049                         return -EOPNOTSUPP;
5050                 /* Only one of these operations is supported */
5051                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
5052                              (NFT_SET_MAP | NFT_SET_OBJECT))
5053                         return -EOPNOTSUPP;
5054                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
5055                              (NFT_SET_EVAL | NFT_SET_OBJECT))
5056                         return -EOPNOTSUPP;
5057                 if ((flags & (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT | NFT_SET_EVAL)) ==
5058                              (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT))
5059                         return -EOPNOTSUPP;
5060                 if ((flags & (NFT_SET_CONSTANT | NFT_SET_TIMEOUT)) ==
5061                              (NFT_SET_CONSTANT | NFT_SET_TIMEOUT))
5062                         return -EOPNOTSUPP;
5063                 if ((flags & (NFT_SET_CONSTANT | NFT_SET_TIMEOUT)) ==
5064                              (NFT_SET_CONSTANT | NFT_SET_TIMEOUT))
5065                         return -EOPNOTSUPP;
5066         }
5067
5068         desc.dtype = 0;
5069         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
5070                 if (!(flags & NFT_SET_MAP))
5071                         return -EINVAL;
5072
5073                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
5074                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
5075                     desc.dtype != NFT_DATA_VERDICT)
5076                         return -EINVAL;
5077
5078                 if (desc.dtype != NFT_DATA_VERDICT) {
5079                         if (nla[NFTA_SET_DATA_LEN] == NULL)
5080                                 return -EINVAL;
5081                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
5082                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
5083                                 return -EINVAL;
5084                 } else
5085                         desc.dlen = sizeof(struct nft_verdict);
5086         } else if (flags & NFT_SET_MAP)
5087                 return -EINVAL;
5088
5089         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
5090                 if (!(flags & NFT_SET_OBJECT))
5091                         return -EINVAL;
5092
5093                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
5094                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
5095                     desc.objtype > NFT_OBJECT_MAX)
5096                         return -EOPNOTSUPP;
5097         } else if (flags & NFT_SET_OBJECT)
5098                 return -EINVAL;
5099         else
5100                 desc.objtype = NFT_OBJECT_UNSPEC;
5101
5102         desc.timeout = 0;
5103         if (nla[NFTA_SET_TIMEOUT] != NULL) {
5104                 if (!(flags & NFT_SET_TIMEOUT))
5105                         return -EINVAL;
5106
5107                 if (flags & NFT_SET_ANONYMOUS)
5108                         return -EOPNOTSUPP;
5109
5110                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
5111                 if (err)
5112                         return err;
5113         }
5114         desc.gc_int = 0;
5115         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
5116                 if (!(flags & NFT_SET_TIMEOUT))
5117                         return -EINVAL;
5118
5119                 if (flags & NFT_SET_ANONYMOUS)
5120                         return -EOPNOTSUPP;
5121
5122                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
5123         }
5124
5125         desc.policy = NFT_SET_POL_PERFORMANCE;
5126         if (nla[NFTA_SET_POLICY] != NULL) {
5127                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
5128                 switch (desc.policy) {
5129                 case NFT_SET_POL_PERFORMANCE:
5130                 case NFT_SET_POL_MEMORY:
5131                         break;
5132                 default:
5133                         return -EOPNOTSUPP;
5134                 }
5135         }
5136
5137         if (nla[NFTA_SET_DESC] != NULL) {
5138                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5139                 if (err < 0)
5140                         return err;
5141
5142                 if (desc.field_count > 1) {
5143                         if (!(flags & NFT_SET_CONCAT))
5144                                 return -EINVAL;
5145                 } else if (flags & NFT_SET_CONCAT) {
5146                         return -EINVAL;
5147                 }
5148         } else if (flags & NFT_SET_CONCAT) {
5149                 return -EINVAL;
5150         }
5151
5152         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5153                 desc.expr = true;
5154
5155         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5156                                  NETLINK_CB(skb).portid);
5157         if (IS_ERR(table)) {
5158                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5159                 return PTR_ERR(table);
5160         }
5161
5162         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5163
5164         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5165         if (IS_ERR(set)) {
5166                 if (PTR_ERR(set) != -ENOENT) {
5167                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5168                         return PTR_ERR(set);
5169                 }
5170         } else {
5171                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5172
5173                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5174                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5175                         return -EEXIST;
5176                 }
5177                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5178                         return -EOPNOTSUPP;
5179
5180                 if (nft_set_is_anonymous(set))
5181                         return -EOPNOTSUPP;
5182
5183                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5184                 if (err < 0)
5185                         return err;
5186
5187                 err = 0;
5188                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5189                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5190                         err = -EEXIST;
5191                 }
5192
5193                 for (i = 0; i < num_exprs; i++)
5194                         nft_expr_destroy(&ctx, exprs[i]);
5195
5196                 if (err < 0)
5197                         return err;
5198
5199                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5200         }
5201
5202         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5203                 return -ENOENT;
5204
5205         ops = nft_select_set_ops(&ctx, nla, &desc);
5206         if (IS_ERR(ops))
5207                 return PTR_ERR(ops);
5208
5209         udlen = 0;
5210         if (nla[NFTA_SET_USERDATA])
5211                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5212
5213         size = 0;
5214         if (ops->privsize != NULL)
5215                 size = ops->privsize(nla, &desc);
5216         alloc_size = sizeof(*set) + size + udlen;
5217         if (alloc_size < size || alloc_size > INT_MAX)
5218                 return -ENOMEM;
5219
5220         if (!nft_use_inc(&table->use))
5221                 return -EMFILE;
5222
5223         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5224         if (!set) {
5225                 err = -ENOMEM;
5226                 goto err_alloc;
5227         }
5228
5229         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5230         if (!name) {
5231                 err = -ENOMEM;
5232                 goto err_set_name;
5233         }
5234
5235         err = nf_tables_set_alloc_name(&ctx, set, name);
5236         kfree(name);
5237         if (err < 0)
5238                 goto err_set_name;
5239
5240         udata = NULL;
5241         if (udlen) {
5242                 udata = set->data + size;
5243                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5244         }
5245
5246         INIT_LIST_HEAD(&set->bindings);
5247         INIT_LIST_HEAD(&set->catchall_list);
5248         refcount_set(&set->refs, 1);
5249         set->table = table;
5250         write_pnet(&set->net, net);
5251         set->ops = ops;
5252         set->ktype = desc.ktype;
5253         set->klen = desc.klen;
5254         set->dtype = desc.dtype;
5255         set->objtype = desc.objtype;
5256         set->dlen = desc.dlen;
5257         set->flags = flags;
5258         set->size = desc.size;
5259         set->policy = desc.policy;
5260         set->udlen = udlen;
5261         set->udata = udata;
5262         set->timeout = desc.timeout;
5263         set->gc_int = desc.gc_int;
5264
5265         set->field_count = desc.field_count;
5266         for (i = 0; i < desc.field_count; i++)
5267                 set->field_len[i] = desc.field_len[i];
5268
5269         err = ops->init(set, &desc, nla);
5270         if (err < 0)
5271                 goto err_set_init;
5272
5273         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5274         if (err < 0)
5275                 goto err_set_destroy;
5276
5277         set->num_exprs = num_exprs;
5278         set->handle = nf_tables_alloc_handle(table);
5279         INIT_LIST_HEAD(&set->pending_update);
5280
5281         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5282         if (err < 0)
5283                 goto err_set_expr_alloc;
5284
5285         list_add_tail_rcu(&set->list, &table->sets);
5286
5287         return 0;
5288
5289 err_set_expr_alloc:
5290         for (i = 0; i < set->num_exprs; i++)
5291                 nft_expr_destroy(&ctx, set->exprs[i]);
5292 err_set_destroy:
5293         ops->destroy(&ctx, set);
5294 err_set_init:
5295         kfree(set->name);
5296 err_set_name:
5297         kvfree(set);
5298 err_alloc:
5299         nft_use_dec_restore(&table->use);
5300
5301         return err;
5302 }
5303
5304 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5305                                      struct nft_set *set)
5306 {
5307         struct nft_set_elem_catchall *next, *catchall;
5308
5309         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5310                 list_del_rcu(&catchall->list);
5311                 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5312                 kfree_rcu(catchall, rcu);
5313         }
5314 }
5315
5316 static void nft_set_put(struct nft_set *set)
5317 {
5318         if (refcount_dec_and_test(&set->refs)) {
5319                 kfree(set->name);
5320                 kvfree(set);
5321         }
5322 }
5323
5324 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5325 {
5326         int i;
5327
5328         if (WARN_ON(set->use > 0))
5329                 return;
5330
5331         for (i = 0; i < set->num_exprs; i++)
5332                 nft_expr_destroy(ctx, set->exprs[i]);
5333
5334         set->ops->destroy(ctx, set);
5335         nft_set_catchall_destroy(ctx, set);
5336         nft_set_put(set);
5337 }
5338
5339 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5340                             const struct nlattr * const nla[])
5341 {
5342         struct netlink_ext_ack *extack = info->extack;
5343         u8 genmask = nft_genmask_next(info->net);
5344         u8 family = info->nfmsg->nfgen_family;
5345         struct net *net = info->net;
5346         const struct nlattr *attr;
5347         struct nft_table *table;
5348         struct nft_set *set;
5349         struct nft_ctx ctx;
5350
5351         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5352                 return -EAFNOSUPPORT;
5353
5354         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5355                                  genmask, NETLINK_CB(skb).portid);
5356         if (IS_ERR(table)) {
5357                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5358                 return PTR_ERR(table);
5359         }
5360
5361         if (nla[NFTA_SET_HANDLE]) {
5362                 attr = nla[NFTA_SET_HANDLE];
5363                 set = nft_set_lookup_byhandle(table, attr, genmask);
5364         } else {
5365                 attr = nla[NFTA_SET_NAME];
5366                 set = nft_set_lookup(table, attr, genmask);
5367         }
5368
5369         if (IS_ERR(set)) {
5370                 if (PTR_ERR(set) == -ENOENT &&
5371                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5372                         return 0;
5373
5374                 NL_SET_BAD_ATTR(extack, attr);
5375                 return PTR_ERR(set);
5376         }
5377         if (set->use ||
5378             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5379              atomic_read(&set->nelems) > 0)) {
5380                 NL_SET_BAD_ATTR(extack, attr);
5381                 return -EBUSY;
5382         }
5383
5384         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5385
5386         return nft_delset(&ctx, set);
5387 }
5388
5389 static int nft_validate_register_store(const struct nft_ctx *ctx,
5390                                        enum nft_registers reg,
5391                                        const struct nft_data *data,
5392                                        enum nft_data_types type,
5393                                        unsigned int len);
5394
5395 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5396                                      struct nft_set *set,
5397                                      struct nft_elem_priv *elem_priv)
5398 {
5399         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5400         enum nft_registers dreg;
5401
5402         dreg = nft_type_to_reg(set->dtype);
5403         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5404                                            set->dtype == NFT_DATA_VERDICT ?
5405                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5406                                            set->dlen);
5407 }
5408
5409 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5410                                         struct nft_set *set,
5411                                         const struct nft_set_iter *iter,
5412                                         struct nft_elem_priv *elem_priv)
5413 {
5414         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5415
5416         if (!nft_set_elem_active(ext, iter->genmask))
5417                 return 0;
5418
5419         return nft_setelem_data_validate(ctx, set, elem_priv);
5420 }
5421
5422 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5423                                        struct nft_set *set)
5424 {
5425         u8 genmask = nft_genmask_next(ctx->net);
5426         struct nft_set_elem_catchall *catchall;
5427         struct nft_set_ext *ext;
5428         int ret = 0;
5429
5430         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5431                 ext = nft_set_elem_ext(set, catchall->elem);
5432                 if (!nft_set_elem_active(ext, genmask))
5433                         continue;
5434
5435                 ret = nft_setelem_data_validate(ctx, set, catchall->elem);
5436                 if (ret < 0)
5437                         break;
5438         }
5439
5440         return ret;
5441 }
5442
5443 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5444                        struct nft_set_binding *binding)
5445 {
5446         struct nft_set_binding *i;
5447         struct nft_set_iter iter;
5448
5449         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5450                 return -EBUSY;
5451
5452         if (binding->flags & NFT_SET_MAP) {
5453                 /* If the set is already bound to the same chain all
5454                  * jumps are already validated for that chain.
5455                  */
5456                 list_for_each_entry(i, &set->bindings, list) {
5457                         if (i->flags & NFT_SET_MAP &&
5458                             i->chain == binding->chain)
5459                                 goto bind;
5460                 }
5461
5462                 iter.genmask    = nft_genmask_next(ctx->net);
5463                 iter.type       = NFT_ITER_UPDATE;
5464                 iter.skip       = 0;
5465                 iter.count      = 0;
5466                 iter.err        = 0;
5467                 iter.fn         = nf_tables_bind_check_setelem;
5468
5469                 set->ops->walk(ctx, set, &iter);
5470                 if (!iter.err)
5471                         iter.err = nft_set_catchall_bind_check(ctx, set);
5472
5473                 if (iter.err < 0)
5474                         return iter.err;
5475         }
5476 bind:
5477         if (!nft_use_inc(&set->use))
5478                 return -EMFILE;
5479
5480         binding->chain = ctx->chain;
5481         list_add_tail_rcu(&binding->list, &set->bindings);
5482         nft_set_trans_bind(ctx, set);
5483
5484         return 0;
5485 }
5486 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5487
5488 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5489                                  struct nft_set_binding *binding, bool event)
5490 {
5491         list_del_rcu(&binding->list);
5492
5493         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5494                 list_del_rcu(&set->list);
5495                 set->dead = 1;
5496                 if (event)
5497                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5498                                              GFP_KERNEL);
5499         }
5500 }
5501
5502 static void nft_setelem_data_activate(const struct net *net,
5503                                       const struct nft_set *set,
5504                                       struct nft_elem_priv *elem_priv);
5505
5506 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5507                                 struct nft_set *set,
5508                                 const struct nft_set_iter *iter,
5509                                 struct nft_elem_priv *elem_priv)
5510 {
5511         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5512
5513         /* called from abort path, reverse check to undo changes. */
5514         if (nft_set_elem_active(ext, iter->genmask))
5515                 return 0;
5516
5517         nft_clear(ctx->net, ext);
5518         nft_setelem_data_activate(ctx->net, set, elem_priv);
5519
5520         return 0;
5521 }
5522
5523 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5524                                       struct nft_set *set)
5525 {
5526         u8 genmask = nft_genmask_next(ctx->net);
5527         struct nft_set_elem_catchall *catchall;
5528         struct nft_set_ext *ext;
5529
5530         list_for_each_entry(catchall, &set->catchall_list, list) {
5531                 ext = nft_set_elem_ext(set, catchall->elem);
5532                 if (!nft_set_elem_active(ext, genmask))
5533                         continue;
5534
5535                 nft_clear(ctx->net, ext);
5536                 nft_setelem_data_activate(ctx->net, set, catchall->elem);
5537                 break;
5538         }
5539 }
5540
5541 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5542 {
5543         struct nft_set_iter iter = {
5544                 .genmask        = nft_genmask_next(ctx->net),
5545                 .type           = NFT_ITER_UPDATE,
5546                 .fn             = nft_mapelem_activate,
5547         };
5548
5549         set->ops->walk(ctx, set, &iter);
5550         WARN_ON_ONCE(iter.err);
5551
5552         nft_map_catchall_activate(ctx, set);
5553 }
5554
5555 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5556 {
5557         if (nft_set_is_anonymous(set)) {
5558                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5559                         nft_map_activate(ctx, set);
5560
5561                 nft_clear(ctx->net, set);
5562         }
5563
5564         nft_use_inc_restore(&set->use);
5565 }
5566 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5567
5568 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5569                               struct nft_set_binding *binding,
5570                               enum nft_trans_phase phase)
5571 {
5572         switch (phase) {
5573         case NFT_TRANS_PREPARE_ERROR:
5574                 nft_set_trans_unbind(ctx, set);
5575                 if (nft_set_is_anonymous(set))
5576                         nft_deactivate_next(ctx->net, set);
5577                 else
5578                         list_del_rcu(&binding->list);
5579
5580                 nft_use_dec(&set->use);
5581                 break;
5582         case NFT_TRANS_PREPARE:
5583                 if (nft_set_is_anonymous(set)) {
5584                         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5585                                 nft_map_deactivate(ctx, set);
5586
5587                         nft_deactivate_next(ctx->net, set);
5588                 }
5589                 nft_use_dec(&set->use);
5590                 return;
5591         case NFT_TRANS_ABORT:
5592         case NFT_TRANS_RELEASE:
5593                 if (nft_set_is_anonymous(set) &&
5594                     set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5595                         nft_map_deactivate(ctx, set);
5596
5597                 nft_use_dec(&set->use);
5598                 fallthrough;
5599         default:
5600                 nf_tables_unbind_set(ctx, set, binding,
5601                                      phase == NFT_TRANS_COMMIT);
5602         }
5603 }
5604 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5605
5606 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5607 {
5608         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5609                 nft_set_destroy(ctx, set);
5610 }
5611 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5612
5613 const struct nft_set_ext_type nft_set_ext_types[] = {
5614         [NFT_SET_EXT_KEY]               = {
5615                 .align  = __alignof__(u32),
5616         },
5617         [NFT_SET_EXT_DATA]              = {
5618                 .align  = __alignof__(u32),
5619         },
5620         [NFT_SET_EXT_EXPRESSIONS]       = {
5621                 .align  = __alignof__(struct nft_set_elem_expr),
5622         },
5623         [NFT_SET_EXT_OBJREF]            = {
5624                 .len    = sizeof(struct nft_object *),
5625                 .align  = __alignof__(struct nft_object *),
5626         },
5627         [NFT_SET_EXT_FLAGS]             = {
5628                 .len    = sizeof(u8),
5629                 .align  = __alignof__(u8),
5630         },
5631         [NFT_SET_EXT_TIMEOUT]           = {
5632                 .len    = sizeof(u64),
5633                 .align  = __alignof__(u64),
5634         },
5635         [NFT_SET_EXT_EXPIRATION]        = {
5636                 .len    = sizeof(u64),
5637                 .align  = __alignof__(u64),
5638         },
5639         [NFT_SET_EXT_USERDATA]          = {
5640                 .len    = sizeof(struct nft_userdata),
5641                 .align  = __alignof__(struct nft_userdata),
5642         },
5643         [NFT_SET_EXT_KEY_END]           = {
5644                 .align  = __alignof__(u32),
5645         },
5646 };
5647
5648 /*
5649  * Set elements
5650  */
5651
5652 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5653         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5654         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5655         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5656         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5657         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5658         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5659                                             .len = NFT_USERDATA_MAXLEN },
5660         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5661         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5662                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5663         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5664         [NFTA_SET_ELEM_EXPRESSIONS]     = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
5665 };
5666
5667 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5668         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5669                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5670         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5671                                             .len = NFT_SET_MAXNAMELEN - 1 },
5672         [NFTA_SET_ELEM_LIST_ELEMENTS]   = NLA_POLICY_NESTED_ARRAY(nft_set_elem_policy),
5673         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5674 };
5675
5676 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5677                                   const struct nft_set *set,
5678                                   const struct nft_set_ext *ext,
5679                                   bool reset)
5680 {
5681         struct nft_set_elem_expr *elem_expr;
5682         u32 size, num_exprs = 0;
5683         struct nft_expr *expr;
5684         struct nlattr *nest;
5685
5686         elem_expr = nft_set_ext_expr(ext);
5687         nft_setelem_expr_foreach(expr, elem_expr, size)
5688                 num_exprs++;
5689
5690         if (num_exprs == 1) {
5691                 expr = nft_setelem_expr_at(elem_expr, 0);
5692                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5693                         return -1;
5694
5695                 return 0;
5696         } else if (num_exprs > 1) {
5697                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5698                 if (nest == NULL)
5699                         goto nla_put_failure;
5700
5701                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5702                         expr = nft_setelem_expr_at(elem_expr, size);
5703                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5704                                 goto nla_put_failure;
5705                 }
5706                 nla_nest_end(skb, nest);
5707         }
5708         return 0;
5709
5710 nla_put_failure:
5711         return -1;
5712 }
5713
5714 static int nf_tables_fill_setelem(struct sk_buff *skb,
5715                                   const struct nft_set *set,
5716                                   const struct nft_elem_priv *elem_priv,
5717                                   bool reset)
5718 {
5719         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5720         unsigned char *b = skb_tail_pointer(skb);
5721         struct nlattr *nest;
5722
5723         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5724         if (nest == NULL)
5725                 goto nla_put_failure;
5726
5727         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5728             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5729                           NFT_DATA_VALUE, set->klen) < 0)
5730                 goto nla_put_failure;
5731
5732         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5733             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5734                           NFT_DATA_VALUE, set->klen) < 0)
5735                 goto nla_put_failure;
5736
5737         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5738             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5739                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5740                           set->dlen) < 0)
5741                 goto nla_put_failure;
5742
5743         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5744             nft_set_elem_expr_dump(skb, set, ext, reset))
5745                 goto nla_put_failure;
5746
5747         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5748             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5749                            (*nft_set_ext_obj(ext))->key.name) < 0)
5750                 goto nla_put_failure;
5751
5752         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5753             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5754                          htonl(*nft_set_ext_flags(ext))))
5755                 goto nla_put_failure;
5756
5757         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5758             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5759                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5760                          NFTA_SET_ELEM_PAD))
5761                 goto nla_put_failure;
5762
5763         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5764                 u64 expires, now = get_jiffies_64();
5765
5766                 expires = *nft_set_ext_expiration(ext);
5767                 if (time_before64(now, expires))
5768                         expires -= now;
5769                 else
5770                         expires = 0;
5771
5772                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5773                                  nf_jiffies64_to_msecs(expires),
5774                                  NFTA_SET_ELEM_PAD))
5775                         goto nla_put_failure;
5776         }
5777
5778         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5779                 struct nft_userdata *udata;
5780
5781                 udata = nft_set_ext_userdata(ext);
5782                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5783                             udata->len + 1, udata->data))
5784                         goto nla_put_failure;
5785         }
5786
5787         nla_nest_end(skb, nest);
5788         return 0;
5789
5790 nla_put_failure:
5791         nlmsg_trim(skb, b);
5792         return -EMSGSIZE;
5793 }
5794
5795 struct nft_set_dump_args {
5796         const struct netlink_callback   *cb;
5797         struct nft_set_iter             iter;
5798         struct sk_buff                  *skb;
5799         bool                            reset;
5800 };
5801
5802 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5803                                   struct nft_set *set,
5804                                   const struct nft_set_iter *iter,
5805                                   struct nft_elem_priv *elem_priv)
5806 {
5807         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5808         struct nft_set_dump_args *args;
5809
5810         if (!nft_set_elem_active(ext, iter->genmask))
5811                 return 0;
5812
5813         if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext))
5814                 return 0;
5815
5816         args = container_of(iter, struct nft_set_dump_args, iter);
5817         return nf_tables_fill_setelem(args->skb, set, elem_priv, args->reset);
5818 }
5819
5820 static void audit_log_nft_set_reset(const struct nft_table *table,
5821                                     unsigned int base_seq,
5822                                     unsigned int nentries)
5823 {
5824         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5825
5826         audit_log_nfcfg(buf, table->family, nentries,
5827                         AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5828         kfree(buf);
5829 }
5830
5831 struct nft_set_dump_ctx {
5832         const struct nft_set    *set;
5833         struct nft_ctx          ctx;
5834         bool                    reset;
5835 };
5836
5837 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5838                                  const struct nft_set *set, bool reset,
5839                                  unsigned int base_seq)
5840 {
5841         struct nft_set_elem_catchall *catchall;
5842         u8 genmask = nft_genmask_cur(net);
5843         struct nft_set_ext *ext;
5844         int ret = 0;
5845
5846         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5847                 ext = nft_set_elem_ext(set, catchall->elem);
5848                 if (!nft_set_elem_active(ext, genmask) ||
5849                     nft_set_elem_expired(ext))
5850                         continue;
5851
5852                 ret = nf_tables_fill_setelem(skb, set, catchall->elem, reset);
5853                 if (reset && !ret)
5854                         audit_log_nft_set_reset(set->table, base_seq, 1);
5855                 break;
5856         }
5857
5858         return ret;
5859 }
5860
5861 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5862 {
5863         struct nft_set_dump_ctx *dump_ctx = cb->data;
5864         struct net *net = sock_net(skb->sk);
5865         struct nftables_pernet *nft_net;
5866         struct nft_table *table;
5867         struct nft_set *set;
5868         struct nft_set_dump_args args;
5869         bool set_found = false;
5870         struct nlmsghdr *nlh;
5871         struct nlattr *nest;
5872         u32 portid, seq;
5873         int event;
5874
5875         rcu_read_lock();
5876         nft_net = nft_pernet(net);
5877         cb->seq = READ_ONCE(nft_net->base_seq);
5878
5879         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5880                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5881                     dump_ctx->ctx.family != table->family)
5882                         continue;
5883
5884                 if (table != dump_ctx->ctx.table)
5885                         continue;
5886
5887                 list_for_each_entry_rcu(set, &table->sets, list) {
5888                         if (set == dump_ctx->set) {
5889                                 set_found = true;
5890                                 break;
5891                         }
5892                 }
5893                 break;
5894         }
5895
5896         if (!set_found) {
5897                 rcu_read_unlock();
5898                 return -ENOENT;
5899         }
5900
5901         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5902         portid = NETLINK_CB(cb->skb).portid;
5903         seq    = cb->nlh->nlmsg_seq;
5904
5905         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5906                            table->family, NFNETLINK_V0, nft_base_seq(net));
5907         if (!nlh)
5908                 goto nla_put_failure;
5909
5910         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5911                 goto nla_put_failure;
5912         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5913                 goto nla_put_failure;
5914
5915         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5916         if (nest == NULL)
5917                 goto nla_put_failure;
5918
5919         args.cb                 = cb;
5920         args.skb                = skb;
5921         args.reset              = dump_ctx->reset;
5922         args.iter.genmask       = nft_genmask_cur(net);
5923         args.iter.type          = NFT_ITER_READ;
5924         args.iter.skip          = cb->args[0];
5925         args.iter.count         = 0;
5926         args.iter.err           = 0;
5927         args.iter.fn            = nf_tables_dump_setelem;
5928         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5929
5930         if (!args.iter.err && args.iter.count == cb->args[0])
5931                 args.iter.err = nft_set_catchall_dump(net, skb, set,
5932                                                       dump_ctx->reset, cb->seq);
5933         nla_nest_end(skb, nest);
5934         nlmsg_end(skb, nlh);
5935
5936         rcu_read_unlock();
5937
5938         if (args.iter.err && args.iter.err != -EMSGSIZE)
5939                 return args.iter.err;
5940         if (args.iter.count == cb->args[0])
5941                 return 0;
5942
5943         cb->args[0] = args.iter.count;
5944         return skb->len;
5945
5946 nla_put_failure:
5947         rcu_read_unlock();
5948         return -ENOSPC;
5949 }
5950
5951 static int nf_tables_dumpreset_set(struct sk_buff *skb,
5952                                    struct netlink_callback *cb)
5953 {
5954         struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
5955         struct nft_set_dump_ctx *dump_ctx = cb->data;
5956         int ret, skip = cb->args[0];
5957
5958         mutex_lock(&nft_net->commit_mutex);
5959
5960         ret = nf_tables_dump_set(skb, cb);
5961
5962         if (cb->args[0] > skip)
5963                 audit_log_nft_set_reset(dump_ctx->ctx.table, cb->seq,
5964                                         cb->args[0] - skip);
5965
5966         mutex_unlock(&nft_net->commit_mutex);
5967
5968         return ret;
5969 }
5970
5971 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5972 {
5973         struct nft_set_dump_ctx *dump_ctx = cb->data;
5974
5975         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5976
5977         return cb->data ? 0 : -ENOMEM;
5978 }
5979
5980 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5981 {
5982         kfree(cb->data);
5983         return 0;
5984 }
5985
5986 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5987                                        const struct nft_ctx *ctx, u32 seq,
5988                                        u32 portid, int event, u16 flags,
5989                                        const struct nft_set *set,
5990                                        const struct nft_elem_priv *elem_priv,
5991                                        bool reset)
5992 {
5993         struct nlmsghdr *nlh;
5994         struct nlattr *nest;
5995         int err;
5996
5997         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5998         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5999                            NFNETLINK_V0, nft_base_seq(ctx->net));
6000         if (!nlh)
6001                 goto nla_put_failure;
6002
6003         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
6004                 goto nla_put_failure;
6005         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
6006                 goto nla_put_failure;
6007
6008         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
6009         if (nest == NULL)
6010                 goto nla_put_failure;
6011
6012         err = nf_tables_fill_setelem(skb, set, elem_priv, reset);
6013         if (err < 0)
6014                 goto nla_put_failure;
6015
6016         nla_nest_end(skb, nest);
6017
6018         nlmsg_end(skb, nlh);
6019         return 0;
6020
6021 nla_put_failure:
6022         nlmsg_trim(skb, nlh);
6023         return -1;
6024 }
6025
6026 static int nft_setelem_parse_flags(const struct nft_set *set,
6027                                    const struct nlattr *attr, u32 *flags)
6028 {
6029         if (attr == NULL)
6030                 return 0;
6031
6032         *flags = ntohl(nla_get_be32(attr));
6033         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
6034                 return -EOPNOTSUPP;
6035         if (!(set->flags & NFT_SET_INTERVAL) &&
6036             *flags & NFT_SET_ELEM_INTERVAL_END)
6037                 return -EINVAL;
6038         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
6039             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
6040                 return -EINVAL;
6041
6042         return 0;
6043 }
6044
6045 static int nft_setelem_parse_key(struct nft_ctx *ctx, const struct nft_set *set,
6046                                  struct nft_data *key, struct nlattr *attr)
6047 {
6048         struct nft_data_desc desc = {
6049                 .type   = NFT_DATA_VALUE,
6050                 .size   = NFT_DATA_VALUE_MAXLEN,
6051                 .len    = set->klen,
6052         };
6053
6054         return nft_data_init(ctx, key, &desc, attr);
6055 }
6056
6057 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
6058                                   struct nft_data_desc *desc,
6059                                   struct nft_data *data,
6060                                   struct nlattr *attr)
6061 {
6062         u32 dtype;
6063
6064         if (set->dtype == NFT_DATA_VERDICT)
6065                 dtype = NFT_DATA_VERDICT;
6066         else
6067                 dtype = NFT_DATA_VALUE;
6068
6069         desc->type = dtype;
6070         desc->size = NFT_DATA_VALUE_MAXLEN;
6071         desc->len = set->dlen;
6072         desc->flags = NFT_DATA_DESC_SETELEM;
6073
6074         return nft_data_init(ctx, data, desc, attr);
6075 }
6076
6077 static void *nft_setelem_catchall_get(const struct net *net,
6078                                       const struct nft_set *set)
6079 {
6080         struct nft_set_elem_catchall *catchall;
6081         u8 genmask = nft_genmask_cur(net);
6082         struct nft_set_ext *ext;
6083         void *priv = NULL;
6084
6085         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6086                 ext = nft_set_elem_ext(set, catchall->elem);
6087                 if (!nft_set_elem_active(ext, genmask) ||
6088                     nft_set_elem_expired(ext))
6089                         continue;
6090
6091                 priv = catchall->elem;
6092                 break;
6093         }
6094
6095         return priv;
6096 }
6097
6098 static int nft_setelem_get(struct nft_ctx *ctx, const struct nft_set *set,
6099                            struct nft_set_elem *elem, u32 flags)
6100 {
6101         void *priv;
6102
6103         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6104                 priv = set->ops->get(ctx->net, set, elem, flags);
6105                 if (IS_ERR(priv))
6106                         return PTR_ERR(priv);
6107         } else {
6108                 priv = nft_setelem_catchall_get(ctx->net, set);
6109                 if (!priv)
6110                         return -ENOENT;
6111         }
6112         elem->priv = priv;
6113
6114         return 0;
6115 }
6116
6117 static int nft_get_set_elem(struct nft_ctx *ctx, const struct nft_set *set,
6118                             const struct nlattr *attr, bool reset)
6119 {
6120         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6121         struct nft_set_elem elem;
6122         struct sk_buff *skb;
6123         uint32_t flags = 0;
6124         int err;
6125
6126         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6127                                           nft_set_elem_policy, NULL);
6128         if (err < 0)
6129                 return err;
6130
6131         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6132         if (err < 0)
6133                 return err;
6134
6135         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6136                 return -EINVAL;
6137
6138         if (nla[NFTA_SET_ELEM_KEY]) {
6139                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6140                                             nla[NFTA_SET_ELEM_KEY]);
6141                 if (err < 0)
6142                         return err;
6143         }
6144
6145         if (nla[NFTA_SET_ELEM_KEY_END]) {
6146                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6147                                             nla[NFTA_SET_ELEM_KEY_END]);
6148                 if (err < 0)
6149                         return err;
6150         }
6151
6152         err = nft_setelem_get(ctx, set, &elem, flags);
6153         if (err < 0)
6154                 return err;
6155
6156         err = -ENOMEM;
6157         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6158         if (skb == NULL)
6159                 return err;
6160
6161         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6162                                           NFT_MSG_NEWSETELEM, 0, set, elem.priv,
6163                                           reset);
6164         if (err < 0)
6165                 goto err_fill_setelem;
6166
6167         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6168
6169 err_fill_setelem:
6170         kfree_skb(skb);
6171         return err;
6172 }
6173
6174 static int nft_set_dump_ctx_init(struct nft_set_dump_ctx *dump_ctx,
6175                                  const struct sk_buff *skb,
6176                                  const struct nfnl_info *info,
6177                                  const struct nlattr * const nla[],
6178                                  bool reset)
6179 {
6180         struct netlink_ext_ack *extack = info->extack;
6181         u8 genmask = nft_genmask_cur(info->net);
6182         u8 family = info->nfmsg->nfgen_family;
6183         struct net *net = info->net;
6184         struct nft_table *table;
6185         struct nft_set *set;
6186
6187         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6188                                  genmask, 0);
6189         if (IS_ERR(table)) {
6190                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6191                 return PTR_ERR(table);
6192         }
6193
6194         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6195         if (IS_ERR(set)) {
6196                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
6197                 return PTR_ERR(set);
6198         }
6199
6200         nft_ctx_init(&dump_ctx->ctx, net, skb,
6201                      info->nlh, family, table, NULL, nla);
6202         dump_ctx->set = set;
6203         dump_ctx->reset = reset;
6204         return 0;
6205 }
6206
6207 /* called with rcu_read_lock held */
6208 static int nf_tables_getsetelem(struct sk_buff *skb,
6209                                 const struct nfnl_info *info,
6210                                 const struct nlattr * const nla[])
6211 {
6212         struct netlink_ext_ack *extack = info->extack;
6213         struct nft_set_dump_ctx dump_ctx;
6214         struct nlattr *attr;
6215         int rem, err = 0;
6216
6217         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6218                 struct netlink_dump_control c = {
6219                         .start = nf_tables_dump_set_start,
6220                         .dump = nf_tables_dump_set,
6221                         .done = nf_tables_dump_set_done,
6222                         .module = THIS_MODULE,
6223                 };
6224
6225                 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, false);
6226                 if (err)
6227                         return err;
6228
6229                 c.data = &dump_ctx;
6230                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6231         }
6232
6233         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6234                 return -EINVAL;
6235
6236         err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, false);
6237         if (err)
6238                 return err;
6239
6240         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6241                 err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, false);
6242                 if (err < 0) {
6243                         NL_SET_BAD_ATTR(extack, attr);
6244                         break;
6245                 }
6246         }
6247
6248         return err;
6249 }
6250
6251 static int nf_tables_getsetelem_reset(struct sk_buff *skb,
6252                                       const struct nfnl_info *info,
6253                                       const struct nlattr * const nla[])
6254 {
6255         struct nftables_pernet *nft_net = nft_pernet(info->net);
6256         struct netlink_ext_ack *extack = info->extack;
6257         struct nft_set_dump_ctx dump_ctx;
6258         int rem, err = 0, nelems = 0;
6259         struct nlattr *attr;
6260
6261         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6262                 struct netlink_dump_control c = {
6263                         .start = nf_tables_dump_set_start,
6264                         .dump = nf_tables_dumpreset_set,
6265                         .done = nf_tables_dump_set_done,
6266                         .module = THIS_MODULE,
6267                 };
6268
6269                 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, true);
6270                 if (err)
6271                         return err;
6272
6273                 c.data = &dump_ctx;
6274                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6275         }
6276
6277         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6278                 return -EINVAL;
6279
6280         if (!try_module_get(THIS_MODULE))
6281                 return -EINVAL;
6282         rcu_read_unlock();
6283         mutex_lock(&nft_net->commit_mutex);
6284         rcu_read_lock();
6285
6286         err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, true);
6287         if (err)
6288                 goto out_unlock;
6289
6290         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6291                 err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, true);
6292                 if (err < 0) {
6293                         NL_SET_BAD_ATTR(extack, attr);
6294                         break;
6295                 }
6296                 nelems++;
6297         }
6298         audit_log_nft_set_reset(dump_ctx.ctx.table, nft_net->base_seq, nelems);
6299
6300 out_unlock:
6301         rcu_read_unlock();
6302         mutex_unlock(&nft_net->commit_mutex);
6303         rcu_read_lock();
6304         module_put(THIS_MODULE);
6305
6306         return err;
6307 }
6308
6309 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6310                                      const struct nft_set *set,
6311                                      const struct nft_elem_priv *elem_priv,
6312                                      int event)
6313 {
6314         struct nftables_pernet *nft_net;
6315         struct net *net = ctx->net;
6316         u32 portid = ctx->portid;
6317         struct sk_buff *skb;
6318         u16 flags = 0;
6319         int err;
6320
6321         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6322                 return;
6323
6324         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6325         if (skb == NULL)
6326                 goto err;
6327
6328         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6329                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6330
6331         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6332                                           set, elem_priv, false);
6333         if (err < 0) {
6334                 kfree_skb(skb);
6335                 goto err;
6336         }
6337
6338         nft_net = nft_pernet(net);
6339         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6340         return;
6341 err:
6342         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6343 }
6344
6345 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6346                                               int msg_type,
6347                                               struct nft_set *set)
6348 {
6349         struct nft_trans *trans;
6350
6351         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6352         if (trans == NULL)
6353                 return NULL;
6354
6355         nft_trans_elem_set(trans) = set;
6356         return trans;
6357 }
6358
6359 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6360                                          const struct nft_set *set,
6361                                          const struct nlattr *attr)
6362 {
6363         struct nft_expr *expr;
6364         int err;
6365
6366         expr = nft_expr_init(ctx, attr);
6367         if (IS_ERR(expr))
6368                 return expr;
6369
6370         err = -EOPNOTSUPP;
6371         if (expr->ops->type->flags & NFT_EXPR_GC) {
6372                 if (set->flags & NFT_SET_TIMEOUT)
6373                         goto err_set_elem_expr;
6374                 if (!set->ops->gc_init)
6375                         goto err_set_elem_expr;
6376                 set->ops->gc_init(set);
6377         }
6378
6379         return expr;
6380
6381 err_set_elem_expr:
6382         nft_expr_destroy(ctx, expr);
6383         return ERR_PTR(err);
6384 }
6385
6386 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6387 {
6388         len += nft_set_ext_types[id].len;
6389         if (len > tmpl->ext_len[id] ||
6390             len > U8_MAX)
6391                 return -1;
6392
6393         return 0;
6394 }
6395
6396 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6397                               void *to, const void *from, u32 len)
6398 {
6399         if (nft_set_ext_check(tmpl, id, len) < 0)
6400                 return -1;
6401
6402         memcpy(to, from, len);
6403
6404         return 0;
6405 }
6406
6407 struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
6408                                         const struct nft_set_ext_tmpl *tmpl,
6409                                         const u32 *key, const u32 *key_end,
6410                                         const u32 *data,
6411                                         u64 timeout, u64 expiration, gfp_t gfp)
6412 {
6413         struct nft_set_ext *ext;
6414         void *elem;
6415
6416         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6417         if (elem == NULL)
6418                 return ERR_PTR(-ENOMEM);
6419
6420         ext = nft_set_elem_ext(set, elem);
6421         nft_set_ext_init(ext, tmpl);
6422
6423         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6424             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6425                                nft_set_ext_key(ext), key, set->klen) < 0)
6426                 goto err_ext_check;
6427
6428         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6429             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6430                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6431                 goto err_ext_check;
6432
6433         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6434             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6435                                nft_set_ext_data(ext), data, set->dlen) < 0)
6436                 goto err_ext_check;
6437
6438         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6439                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6440                 if (expiration == 0)
6441                         *nft_set_ext_expiration(ext) += timeout;
6442         }
6443         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6444                 *nft_set_ext_timeout(ext) = timeout;
6445
6446         return elem;
6447
6448 err_ext_check:
6449         kfree(elem);
6450
6451         return ERR_PTR(-EINVAL);
6452 }
6453
6454 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6455                                         struct nft_expr *expr)
6456 {
6457         if (expr->ops->destroy_clone) {
6458                 expr->ops->destroy_clone(ctx, expr);
6459                 module_put(expr->ops->type->owner);
6460         } else {
6461                 nf_tables_expr_destroy(ctx, expr);
6462         }
6463 }
6464
6465 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6466                                       struct nft_set_elem_expr *elem_expr)
6467 {
6468         struct nft_expr *expr;
6469         u32 size;
6470
6471         nft_setelem_expr_foreach(expr, elem_expr, size)
6472                 __nft_set_elem_expr_destroy(ctx, expr);
6473 }
6474
6475 /* Drop references and destroy. Called from gc, dynset and abort path. */
6476 void nft_set_elem_destroy(const struct nft_set *set,
6477                           const struct nft_elem_priv *elem_priv,
6478                           bool destroy_expr)
6479 {
6480         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6481         struct nft_ctx ctx = {
6482                 .net    = read_pnet(&set->net),
6483                 .family = set->table->family,
6484         };
6485
6486         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6487         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6488                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6489         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6490                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6491         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6492                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6493
6494         kfree(elem_priv);
6495 }
6496 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6497
6498 /* Destroy element. References have been already dropped in the preparation
6499  * path via nft_setelem_data_deactivate().
6500  */
6501 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6502                                 const struct nft_set *set,
6503                                 const struct nft_elem_priv *elem_priv)
6504 {
6505         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6506
6507         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6508                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6509
6510         kfree(elem_priv);
6511 }
6512
6513 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6514                             struct nft_expr *expr_array[])
6515 {
6516         struct nft_expr *expr;
6517         int err, i, k;
6518
6519         for (i = 0; i < set->num_exprs; i++) {
6520                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6521                 if (!expr)
6522                         goto err_expr;
6523
6524                 err = nft_expr_clone(expr, set->exprs[i]);
6525                 if (err < 0) {
6526                         kfree(expr);
6527                         goto err_expr;
6528                 }
6529                 expr_array[i] = expr;
6530         }
6531
6532         return 0;
6533
6534 err_expr:
6535         for (k = i - 1; k >= 0; k--)
6536                 nft_expr_destroy(ctx, expr_array[k]);
6537
6538         return -ENOMEM;
6539 }
6540
6541 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6542                                    const struct nft_set_ext_tmpl *tmpl,
6543                                    const struct nft_set_ext *ext,
6544                                    struct nft_expr *expr_array[],
6545                                    u32 num_exprs)
6546 {
6547         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6548         u32 len = sizeof(struct nft_set_elem_expr);
6549         struct nft_expr *expr;
6550         int i, err;
6551
6552         if (num_exprs == 0)
6553                 return 0;
6554
6555         for (i = 0; i < num_exprs; i++)
6556                 len += expr_array[i]->ops->size;
6557
6558         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6559                 return -EINVAL;
6560
6561         for (i = 0; i < num_exprs; i++) {
6562                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6563                 err = nft_expr_clone(expr, expr_array[i]);
6564                 if (err < 0)
6565                         goto err_elem_expr_setup;
6566
6567                 elem_expr->size += expr_array[i]->ops->size;
6568                 nft_expr_destroy(ctx, expr_array[i]);
6569                 expr_array[i] = NULL;
6570         }
6571
6572         return 0;
6573
6574 err_elem_expr_setup:
6575         for (; i < num_exprs; i++) {
6576                 nft_expr_destroy(ctx, expr_array[i]);
6577                 expr_array[i] = NULL;
6578         }
6579
6580         return -ENOMEM;
6581 }
6582
6583 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6584                                             const struct nft_set *set)
6585 {
6586         struct nft_set_elem_catchall *catchall;
6587         u8 genmask = nft_genmask_cur(net);
6588         struct nft_set_ext *ext;
6589
6590         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6591                 ext = nft_set_elem_ext(set, catchall->elem);
6592                 if (nft_set_elem_active(ext, genmask) &&
6593                     !nft_set_elem_expired(ext) &&
6594                     !nft_set_elem_is_dead(ext))
6595                         return ext;
6596         }
6597
6598         return NULL;
6599 }
6600 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6601
6602 static int nft_setelem_catchall_insert(const struct net *net,
6603                                        struct nft_set *set,
6604                                        const struct nft_set_elem *elem,
6605                                        struct nft_elem_priv **priv)
6606 {
6607         struct nft_set_elem_catchall *catchall;
6608         u8 genmask = nft_genmask_next(net);
6609         struct nft_set_ext *ext;
6610
6611         list_for_each_entry(catchall, &set->catchall_list, list) {
6612                 ext = nft_set_elem_ext(set, catchall->elem);
6613                 if (nft_set_elem_active(ext, genmask)) {
6614                         *priv = catchall->elem;
6615                         return -EEXIST;
6616                 }
6617         }
6618
6619         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6620         if (!catchall)
6621                 return -ENOMEM;
6622
6623         catchall->elem = elem->priv;
6624         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6625
6626         return 0;
6627 }
6628
6629 static int nft_setelem_insert(const struct net *net,
6630                               struct nft_set *set,
6631                               const struct nft_set_elem *elem,
6632                               struct nft_elem_priv **elem_priv,
6633                               unsigned int flags)
6634 {
6635         int ret;
6636
6637         if (flags & NFT_SET_ELEM_CATCHALL)
6638                 ret = nft_setelem_catchall_insert(net, set, elem, elem_priv);
6639         else
6640                 ret = set->ops->insert(net, set, elem, elem_priv);
6641
6642         return ret;
6643 }
6644
6645 static bool nft_setelem_is_catchall(const struct nft_set *set,
6646                                     const struct nft_elem_priv *elem_priv)
6647 {
6648         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6649
6650         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6651             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6652                 return true;
6653
6654         return false;
6655 }
6656
6657 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6658                                  struct nft_elem_priv *elem_priv)
6659 {
6660         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6661
6662         if (nft_setelem_is_catchall(set, elem_priv)) {
6663                 nft_clear(net, ext);
6664         } else {
6665                 set->ops->activate(net, set, elem_priv);
6666         }
6667 }
6668
6669 static int nft_setelem_catchall_deactivate(const struct net *net,
6670                                            struct nft_set *set,
6671                                            struct nft_set_elem *elem)
6672 {
6673         struct nft_set_elem_catchall *catchall;
6674         struct nft_set_ext *ext;
6675
6676         list_for_each_entry(catchall, &set->catchall_list, list) {
6677                 ext = nft_set_elem_ext(set, catchall->elem);
6678                 if (!nft_is_active_next(net, ext))
6679                         continue;
6680
6681                 kfree(elem->priv);
6682                 elem->priv = catchall->elem;
6683                 nft_set_elem_change_active(net, set, ext);
6684                 return 0;
6685         }
6686
6687         return -ENOENT;
6688 }
6689
6690 static int __nft_setelem_deactivate(const struct net *net,
6691                                     struct nft_set *set,
6692                                     struct nft_set_elem *elem)
6693 {
6694         void *priv;
6695
6696         priv = set->ops->deactivate(net, set, elem);
6697         if (!priv)
6698                 return -ENOENT;
6699
6700         kfree(elem->priv);
6701         elem->priv = priv;
6702         set->ndeact++;
6703
6704         return 0;
6705 }
6706
6707 static int nft_setelem_deactivate(const struct net *net,
6708                                   struct nft_set *set,
6709                                   struct nft_set_elem *elem, u32 flags)
6710 {
6711         int ret;
6712
6713         if (flags & NFT_SET_ELEM_CATCHALL)
6714                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6715         else
6716                 ret = __nft_setelem_deactivate(net, set, elem);
6717
6718         return ret;
6719 }
6720
6721 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6722 {
6723         list_del_rcu(&catchall->list);
6724         kfree_rcu(catchall, rcu);
6725 }
6726
6727 static void nft_setelem_catchall_remove(const struct net *net,
6728                                         const struct nft_set *set,
6729                                         struct nft_elem_priv *elem_priv)
6730 {
6731         struct nft_set_elem_catchall *catchall, *next;
6732
6733         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6734                 if (catchall->elem == elem_priv) {
6735                         nft_setelem_catchall_destroy(catchall);
6736                         break;
6737                 }
6738         }
6739 }
6740
6741 static void nft_setelem_remove(const struct net *net,
6742                                const struct nft_set *set,
6743                                struct nft_elem_priv *elem_priv)
6744 {
6745         if (nft_setelem_is_catchall(set, elem_priv))
6746                 nft_setelem_catchall_remove(net, set, elem_priv);
6747         else
6748                 set->ops->remove(net, set, elem_priv);
6749 }
6750
6751 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6752                                       struct nlattr **nla, u32 flags)
6753 {
6754         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6755                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6756                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6757                         return false;
6758
6759                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6760                     flags & NFT_SET_ELEM_CATCHALL)
6761                         return false;
6762         } else {
6763                 if (nla[NFTA_SET_ELEM_KEY_END])
6764                         return false;
6765         }
6766
6767         return true;
6768 }
6769
6770 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6771                             const struct nlattr *attr, u32 nlmsg_flags)
6772 {
6773         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6774         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6775         u8 genmask = nft_genmask_next(ctx->net);
6776         u32 flags = 0, size = 0, num_exprs = 0;
6777         struct nft_set_ext_tmpl tmpl;
6778         struct nft_set_ext *ext, *ext2;
6779         struct nft_set_elem elem;
6780         struct nft_set_binding *binding;
6781         struct nft_elem_priv *elem_priv;
6782         struct nft_object *obj = NULL;
6783         struct nft_userdata *udata;
6784         struct nft_data_desc desc;
6785         enum nft_registers dreg;
6786         struct nft_trans *trans;
6787         u64 expiration;
6788         u64 timeout;
6789         int err, i;
6790         u8 ulen;
6791
6792         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6793                                           nft_set_elem_policy, NULL);
6794         if (err < 0)
6795                 return err;
6796
6797         nft_set_ext_prepare(&tmpl);
6798
6799         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6800         if (err < 0)
6801                 return err;
6802
6803         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6804             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6805                 return -EINVAL;
6806
6807         if (flags != 0) {
6808                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6809                 if (err < 0)
6810                         return err;
6811         }
6812
6813         if (set->flags & NFT_SET_MAP) {
6814                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6815                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6816                         return -EINVAL;
6817         } else {
6818                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6819                         return -EINVAL;
6820         }
6821
6822         if (set->flags & NFT_SET_OBJECT) {
6823                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6824                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6825                         return -EINVAL;
6826         } else {
6827                 if (nla[NFTA_SET_ELEM_OBJREF])
6828                         return -EINVAL;
6829         }
6830
6831         if (!nft_setelem_valid_key_end(set, nla, flags))
6832                 return -EINVAL;
6833
6834         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6835              (nla[NFTA_SET_ELEM_DATA] ||
6836               nla[NFTA_SET_ELEM_OBJREF] ||
6837               nla[NFTA_SET_ELEM_TIMEOUT] ||
6838               nla[NFTA_SET_ELEM_EXPIRATION] ||
6839               nla[NFTA_SET_ELEM_USERDATA] ||
6840               nla[NFTA_SET_ELEM_EXPR] ||
6841               nla[NFTA_SET_ELEM_KEY_END] ||
6842               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6843                 return -EINVAL;
6844
6845         timeout = 0;
6846         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6847                 if (!(set->flags & NFT_SET_TIMEOUT))
6848                         return -EINVAL;
6849                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6850                                             &timeout);
6851                 if (err)
6852                         return err;
6853         } else if (set->flags & NFT_SET_TIMEOUT &&
6854                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6855                 timeout = READ_ONCE(set->timeout);
6856         }
6857
6858         expiration = 0;
6859         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6860                 if (!(set->flags & NFT_SET_TIMEOUT))
6861                         return -EINVAL;
6862                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6863                                             &expiration);
6864                 if (err)
6865                         return err;
6866         }
6867
6868         if (nla[NFTA_SET_ELEM_EXPR]) {
6869                 struct nft_expr *expr;
6870
6871                 if (set->num_exprs && set->num_exprs != 1)
6872                         return -EOPNOTSUPP;
6873
6874                 expr = nft_set_elem_expr_alloc(ctx, set,
6875                                                nla[NFTA_SET_ELEM_EXPR]);
6876                 if (IS_ERR(expr))
6877                         return PTR_ERR(expr);
6878
6879                 expr_array[0] = expr;
6880                 num_exprs = 1;
6881
6882                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6883                         err = -EOPNOTSUPP;
6884                         goto err_set_elem_expr;
6885                 }
6886         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6887                 struct nft_expr *expr;
6888                 struct nlattr *tmp;
6889                 int left;
6890
6891                 i = 0;
6892                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6893                         if (i == NFT_SET_EXPR_MAX ||
6894                             (set->num_exprs && set->num_exprs == i)) {
6895                                 err = -E2BIG;
6896                                 goto err_set_elem_expr;
6897                         }
6898                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6899                                 err = -EINVAL;
6900                                 goto err_set_elem_expr;
6901                         }
6902                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6903                         if (IS_ERR(expr)) {
6904                                 err = PTR_ERR(expr);
6905                                 goto err_set_elem_expr;
6906                         }
6907                         expr_array[i] = expr;
6908                         num_exprs++;
6909
6910                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6911                                 err = -EOPNOTSUPP;
6912                                 goto err_set_elem_expr;
6913                         }
6914                         i++;
6915                 }
6916                 if (set->num_exprs && set->num_exprs != i) {
6917                         err = -EOPNOTSUPP;
6918                         goto err_set_elem_expr;
6919                 }
6920         } else if (set->num_exprs > 0 &&
6921                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6922                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6923                 if (err < 0)
6924                         goto err_set_elem_expr_clone;
6925
6926                 num_exprs = set->num_exprs;
6927         }
6928
6929         if (nla[NFTA_SET_ELEM_KEY]) {
6930                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6931                                             nla[NFTA_SET_ELEM_KEY]);
6932                 if (err < 0)
6933                         goto err_set_elem_expr;
6934
6935                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6936                 if (err < 0)
6937                         goto err_parse_key;
6938         }
6939
6940         if (nla[NFTA_SET_ELEM_KEY_END]) {
6941                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6942                                             nla[NFTA_SET_ELEM_KEY_END]);
6943                 if (err < 0)
6944                         goto err_parse_key;
6945
6946                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6947                 if (err < 0)
6948                         goto err_parse_key_end;
6949         }
6950
6951         if (timeout > 0) {
6952                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6953                 if (err < 0)
6954                         goto err_parse_key_end;
6955
6956                 if (timeout != READ_ONCE(set->timeout)) {
6957                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6958                         if (err < 0)
6959                                 goto err_parse_key_end;
6960                 }
6961         }
6962
6963         if (num_exprs) {
6964                 for (i = 0; i < num_exprs; i++)
6965                         size += expr_array[i]->ops->size;
6966
6967                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6968                                              sizeof(struct nft_set_elem_expr) + size);
6969                 if (err < 0)
6970                         goto err_parse_key_end;
6971         }
6972
6973         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6974                 obj = nft_obj_lookup(ctx->net, ctx->table,
6975                                      nla[NFTA_SET_ELEM_OBJREF],
6976                                      set->objtype, genmask);
6977                 if (IS_ERR(obj)) {
6978                         err = PTR_ERR(obj);
6979                         obj = NULL;
6980                         goto err_parse_key_end;
6981                 }
6982
6983                 if (!nft_use_inc(&obj->use)) {
6984                         err = -EMFILE;
6985                         obj = NULL;
6986                         goto err_parse_key_end;
6987                 }
6988
6989                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6990                 if (err < 0)
6991                         goto err_parse_key_end;
6992         }
6993
6994         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6995                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6996                                              nla[NFTA_SET_ELEM_DATA]);
6997                 if (err < 0)
6998                         goto err_parse_key_end;
6999
7000                 dreg = nft_type_to_reg(set->dtype);
7001                 list_for_each_entry(binding, &set->bindings, list) {
7002                         struct nft_ctx bind_ctx = {
7003                                 .net    = ctx->net,
7004                                 .family = ctx->family,
7005                                 .table  = ctx->table,
7006                                 .chain  = (struct nft_chain *)binding->chain,
7007                         };
7008
7009                         if (!(binding->flags & NFT_SET_MAP))
7010                                 continue;
7011
7012                         err = nft_validate_register_store(&bind_ctx, dreg,
7013                                                           &elem.data.val,
7014                                                           desc.type, desc.len);
7015                         if (err < 0)
7016                                 goto err_parse_data;
7017
7018                         if (desc.type == NFT_DATA_VERDICT &&
7019                             (elem.data.val.verdict.code == NFT_GOTO ||
7020                              elem.data.val.verdict.code == NFT_JUMP))
7021                                 nft_validate_state_update(ctx->table,
7022                                                           NFT_VALIDATE_NEED);
7023                 }
7024
7025                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
7026                 if (err < 0)
7027                         goto err_parse_data;
7028         }
7029
7030         /* The full maximum length of userdata can exceed the maximum
7031          * offset value (U8_MAX) for following extensions, therefor it
7032          * must be the last extension added.
7033          */
7034         ulen = 0;
7035         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
7036                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
7037                 if (ulen > 0) {
7038                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
7039                                                      ulen);
7040                         if (err < 0)
7041                                 goto err_parse_data;
7042                 }
7043         }
7044
7045         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7046                                       elem.key_end.val.data, elem.data.val.data,
7047                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
7048         if (IS_ERR(elem.priv)) {
7049                 err = PTR_ERR(elem.priv);
7050                 goto err_parse_data;
7051         }
7052
7053         ext = nft_set_elem_ext(set, elem.priv);
7054         if (flags)
7055                 *nft_set_ext_flags(ext) = flags;
7056
7057         if (obj)
7058                 *nft_set_ext_obj(ext) = obj;
7059
7060         if (ulen > 0) {
7061                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
7062                         err = -EINVAL;
7063                         goto err_elem_free;
7064                 }
7065                 udata = nft_set_ext_userdata(ext);
7066                 udata->len = ulen - 1;
7067                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
7068         }
7069         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
7070         if (err < 0)
7071                 goto err_elem_free;
7072
7073         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
7074         if (trans == NULL) {
7075                 err = -ENOMEM;
7076                 goto err_elem_free;
7077         }
7078
7079         ext->genmask = nft_genmask_cur(ctx->net);
7080
7081         err = nft_setelem_insert(ctx->net, set, &elem, &elem_priv, flags);
7082         if (err) {
7083                 if (err == -EEXIST) {
7084                         ext2 = nft_set_elem_ext(set, elem_priv);
7085                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
7086                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
7087                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
7088                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
7089                                 goto err_element_clash;
7090                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
7091                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
7092                              memcmp(nft_set_ext_data(ext),
7093                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
7094                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
7095                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
7096                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
7097                                 goto err_element_clash;
7098                         else if (!(nlmsg_flags & NLM_F_EXCL))
7099                                 err = 0;
7100                 } else if (err == -ENOTEMPTY) {
7101                         /* ENOTEMPTY reports overlapping between this element
7102                          * and an existing one.
7103                          */
7104                         err = -EEXIST;
7105                 }
7106                 goto err_element_clash;
7107         }
7108
7109         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
7110                 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
7111
7112                 if (!atomic_add_unless(&set->nelems, 1, max)) {
7113                         err = -ENFILE;
7114                         goto err_set_full;
7115                 }
7116         }
7117
7118         nft_trans_elem_priv(trans) = elem.priv;
7119         nft_trans_commit_list_add_tail(ctx->net, trans);
7120         return 0;
7121
7122 err_set_full:
7123         nft_setelem_remove(ctx->net, set, elem.priv);
7124 err_element_clash:
7125         kfree(trans);
7126 err_elem_free:
7127         nf_tables_set_elem_destroy(ctx, set, elem.priv);
7128 err_parse_data:
7129         if (nla[NFTA_SET_ELEM_DATA] != NULL)
7130                 nft_data_release(&elem.data.val, desc.type);
7131 err_parse_key_end:
7132         if (obj)
7133                 nft_use_dec_restore(&obj->use);
7134
7135         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7136 err_parse_key:
7137         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7138 err_set_elem_expr:
7139         for (i = 0; i < num_exprs && expr_array[i]; i++)
7140                 nft_expr_destroy(ctx, expr_array[i]);
7141 err_set_elem_expr_clone:
7142         return err;
7143 }
7144
7145 static int nf_tables_newsetelem(struct sk_buff *skb,
7146                                 const struct nfnl_info *info,
7147                                 const struct nlattr * const nla[])
7148 {
7149         struct netlink_ext_ack *extack = info->extack;
7150         u8 genmask = nft_genmask_next(info->net);
7151         u8 family = info->nfmsg->nfgen_family;
7152         struct net *net = info->net;
7153         const struct nlattr *attr;
7154         struct nft_table *table;
7155         struct nft_set *set;
7156         struct nft_ctx ctx;
7157         int rem, err;
7158
7159         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
7160                 return -EINVAL;
7161
7162         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7163                                  genmask, NETLINK_CB(skb).portid);
7164         if (IS_ERR(table)) {
7165                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7166                 return PTR_ERR(table);
7167         }
7168
7169         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
7170                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
7171         if (IS_ERR(set)) {
7172                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7173                 return PTR_ERR(set);
7174         }
7175
7176         if (!list_empty(&set->bindings) &&
7177             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7178                 return -EBUSY;
7179
7180         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7181
7182         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7183                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
7184                 if (err < 0) {
7185                         NL_SET_BAD_ATTR(extack, attr);
7186                         return err;
7187                 }
7188         }
7189
7190         if (table->validate_state == NFT_VALIDATE_DO)
7191                 return nft_table_validate(net, table);
7192
7193         return 0;
7194 }
7195
7196 /**
7197  *      nft_data_hold - hold a nft_data item
7198  *
7199  *      @data: struct nft_data to release
7200  *      @type: type of data
7201  *
7202  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7203  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
7204  *      NFT_GOTO verdicts. This function must be called on active data objects
7205  *      from the second phase of the commit protocol.
7206  */
7207 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
7208 {
7209         struct nft_chain *chain;
7210
7211         if (type == NFT_DATA_VERDICT) {
7212                 switch (data->verdict.code) {
7213                 case NFT_JUMP:
7214                 case NFT_GOTO:
7215                         chain = data->verdict.chain;
7216                         nft_use_inc_restore(&chain->use);
7217                         break;
7218                 }
7219         }
7220 }
7221
7222 static int nft_setelem_active_next(const struct net *net,
7223                                    const struct nft_set *set,
7224                                    struct nft_elem_priv *elem_priv)
7225 {
7226         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7227         u8 genmask = nft_genmask_next(net);
7228
7229         return nft_set_elem_active(ext, genmask);
7230 }
7231
7232 static void nft_setelem_data_activate(const struct net *net,
7233                                       const struct nft_set *set,
7234                                       struct nft_elem_priv *elem_priv)
7235 {
7236         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7237
7238         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7239                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
7240         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7241                 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
7242 }
7243
7244 void nft_setelem_data_deactivate(const struct net *net,
7245                                  const struct nft_set *set,
7246                                  struct nft_elem_priv *elem_priv)
7247 {
7248         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7249
7250         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7251                 nft_data_release(nft_set_ext_data(ext), set->dtype);
7252         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7253                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7254 }
7255
7256 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7257                            const struct nlattr *attr)
7258 {
7259         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7260         struct nft_set_ext_tmpl tmpl;
7261         struct nft_set_elem elem;
7262         struct nft_set_ext *ext;
7263         struct nft_trans *trans;
7264         u32 flags = 0;
7265         int err;
7266
7267         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7268                                           nft_set_elem_policy, NULL);
7269         if (err < 0)
7270                 return err;
7271
7272         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7273         if (err < 0)
7274                 return err;
7275
7276         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7277                 return -EINVAL;
7278
7279         if (!nft_setelem_valid_key_end(set, nla, flags))
7280                 return -EINVAL;
7281
7282         nft_set_ext_prepare(&tmpl);
7283
7284         if (flags != 0) {
7285                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7286                 if (err < 0)
7287                         return err;
7288         }
7289
7290         if (nla[NFTA_SET_ELEM_KEY]) {
7291                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7292                                             nla[NFTA_SET_ELEM_KEY]);
7293                 if (err < 0)
7294                         return err;
7295
7296                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7297                 if (err < 0)
7298                         goto fail_elem;
7299         }
7300
7301         if (nla[NFTA_SET_ELEM_KEY_END]) {
7302                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7303                                             nla[NFTA_SET_ELEM_KEY_END]);
7304                 if (err < 0)
7305                         goto fail_elem;
7306
7307                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7308                 if (err < 0)
7309                         goto fail_elem_key_end;
7310         }
7311
7312         err = -ENOMEM;
7313         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7314                                       elem.key_end.val.data, NULL, 0, 0,
7315                                       GFP_KERNEL_ACCOUNT);
7316         if (IS_ERR(elem.priv)) {
7317                 err = PTR_ERR(elem.priv);
7318                 goto fail_elem_key_end;
7319         }
7320
7321         ext = nft_set_elem_ext(set, elem.priv);
7322         if (flags)
7323                 *nft_set_ext_flags(ext) = flags;
7324
7325         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7326         if (trans == NULL)
7327                 goto fail_trans;
7328
7329         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7330         if (err < 0)
7331                 goto fail_ops;
7332
7333         nft_setelem_data_deactivate(ctx->net, set, elem.priv);
7334
7335         nft_trans_elem_priv(trans) = elem.priv;
7336         nft_trans_commit_list_add_tail(ctx->net, trans);
7337         return 0;
7338
7339 fail_ops:
7340         kfree(trans);
7341 fail_trans:
7342         kfree(elem.priv);
7343 fail_elem_key_end:
7344         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7345 fail_elem:
7346         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7347         return err;
7348 }
7349
7350 static int nft_setelem_flush(const struct nft_ctx *ctx,
7351                              struct nft_set *set,
7352                              const struct nft_set_iter *iter,
7353                              struct nft_elem_priv *elem_priv)
7354 {
7355         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7356         struct nft_trans *trans;
7357
7358         if (!nft_set_elem_active(ext, iter->genmask))
7359                 return 0;
7360
7361         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7362                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
7363         if (!trans)
7364                 return -ENOMEM;
7365
7366         set->ops->flush(ctx->net, set, elem_priv);
7367         set->ndeact++;
7368
7369         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7370         nft_trans_elem_set(trans) = set;
7371         nft_trans_elem_priv(trans) = elem_priv;
7372         nft_trans_commit_list_add_tail(ctx->net, trans);
7373
7374         return 0;
7375 }
7376
7377 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7378                                     struct nft_set *set,
7379                                     struct nft_elem_priv *elem_priv)
7380 {
7381         struct nft_trans *trans;
7382
7383         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7384                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
7385         if (!trans)
7386                 return -ENOMEM;
7387
7388         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7389         nft_trans_elem_set(trans) = set;
7390         nft_trans_elem_priv(trans) = elem_priv;
7391         nft_trans_commit_list_add_tail(ctx->net, trans);
7392
7393         return 0;
7394 }
7395
7396 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7397                                   struct nft_set *set)
7398 {
7399         u8 genmask = nft_genmask_next(ctx->net);
7400         struct nft_set_elem_catchall *catchall;
7401         struct nft_set_ext *ext;
7402         int ret = 0;
7403
7404         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7405                 ext = nft_set_elem_ext(set, catchall->elem);
7406                 if (!nft_set_elem_active(ext, genmask))
7407                         continue;
7408
7409                 ret = __nft_set_catchall_flush(ctx, set, catchall->elem);
7410                 if (ret < 0)
7411                         break;
7412                 nft_set_elem_change_active(ctx->net, set, ext);
7413         }
7414
7415         return ret;
7416 }
7417
7418 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7419 {
7420         struct nft_set_iter iter = {
7421                 .genmask        = genmask,
7422                 .type           = NFT_ITER_UPDATE,
7423                 .fn             = nft_setelem_flush,
7424         };
7425
7426         set->ops->walk(ctx, set, &iter);
7427         if (!iter.err)
7428                 iter.err = nft_set_catchall_flush(ctx, set);
7429
7430         return iter.err;
7431 }
7432
7433 static int nf_tables_delsetelem(struct sk_buff *skb,
7434                                 const struct nfnl_info *info,
7435                                 const struct nlattr * const nla[])
7436 {
7437         struct netlink_ext_ack *extack = info->extack;
7438         u8 genmask = nft_genmask_next(info->net);
7439         u8 family = info->nfmsg->nfgen_family;
7440         struct net *net = info->net;
7441         const struct nlattr *attr;
7442         struct nft_table *table;
7443         struct nft_set *set;
7444         struct nft_ctx ctx;
7445         int rem, err = 0;
7446
7447         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7448                                  genmask, NETLINK_CB(skb).portid);
7449         if (IS_ERR(table)) {
7450                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7451                 return PTR_ERR(table);
7452         }
7453
7454         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7455         if (IS_ERR(set)) {
7456                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7457                 return PTR_ERR(set);
7458         }
7459
7460         if (nft_set_is_anonymous(set))
7461                 return -EOPNOTSUPP;
7462
7463         if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7464                 return -EBUSY;
7465
7466         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7467
7468         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7469                 return nft_set_flush(&ctx, set, genmask);
7470
7471         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7472                 err = nft_del_setelem(&ctx, set, attr);
7473                 if (err == -ENOENT &&
7474                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7475                         continue;
7476
7477                 if (err < 0) {
7478                         NL_SET_BAD_ATTR(extack, attr);
7479                         return err;
7480                 }
7481         }
7482
7483         return 0;
7484 }
7485
7486 /*
7487  * Stateful objects
7488  */
7489
7490 /**
7491  *      nft_register_obj- register nf_tables stateful object type
7492  *      @obj_type: object type
7493  *
7494  *      Registers the object type for use with nf_tables. Returns zero on
7495  *      success or a negative errno code otherwise.
7496  */
7497 int nft_register_obj(struct nft_object_type *obj_type)
7498 {
7499         if (obj_type->type == NFT_OBJECT_UNSPEC)
7500                 return -EINVAL;
7501
7502         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7503         list_add_rcu(&obj_type->list, &nf_tables_objects);
7504         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7505         return 0;
7506 }
7507 EXPORT_SYMBOL_GPL(nft_register_obj);
7508
7509 /**
7510  *      nft_unregister_obj - unregister nf_tables object type
7511  *      @obj_type: object type
7512  *
7513  *      Unregisters the object type for use with nf_tables.
7514  */
7515 void nft_unregister_obj(struct nft_object_type *obj_type)
7516 {
7517         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7518         list_del_rcu(&obj_type->list);
7519         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7520 }
7521 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7522
7523 struct nft_object *nft_obj_lookup(const struct net *net,
7524                                   const struct nft_table *table,
7525                                   const struct nlattr *nla, u32 objtype,
7526                                   u8 genmask)
7527 {
7528         struct nft_object_hash_key k = { .table = table };
7529         char search[NFT_OBJ_MAXNAMELEN];
7530         struct rhlist_head *tmp, *list;
7531         struct nft_object *obj;
7532
7533         nla_strscpy(search, nla, sizeof(search));
7534         k.name = search;
7535
7536         WARN_ON_ONCE(!rcu_read_lock_held() &&
7537                      !lockdep_commit_lock_is_held(net));
7538
7539         rcu_read_lock();
7540         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7541         if (!list)
7542                 goto out;
7543
7544         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7545                 if (objtype == obj->ops->type->type &&
7546                     nft_active_genmask(obj, genmask)) {
7547                         rcu_read_unlock();
7548                         return obj;
7549                 }
7550         }
7551 out:
7552         rcu_read_unlock();
7553         return ERR_PTR(-ENOENT);
7554 }
7555 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7556
7557 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7558                                                   const struct nlattr *nla,
7559                                                   u32 objtype, u8 genmask)
7560 {
7561         struct nft_object *obj;
7562
7563         list_for_each_entry(obj, &table->objects, list) {
7564                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7565                     objtype == obj->ops->type->type &&
7566                     nft_active_genmask(obj, genmask))
7567                         return obj;
7568         }
7569         return ERR_PTR(-ENOENT);
7570 }
7571
7572 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7573         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7574                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7575         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7576                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7577         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7578         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7579         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7580         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7581                                     .len = NFT_USERDATA_MAXLEN },
7582 };
7583
7584 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7585                                        const struct nft_object_type *type,
7586                                        const struct nlattr *attr)
7587 {
7588         struct nlattr **tb;
7589         const struct nft_object_ops *ops;
7590         struct nft_object *obj;
7591         int err = -ENOMEM;
7592
7593         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7594         if (!tb)
7595                 goto err1;
7596
7597         if (attr) {
7598                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7599                                                   type->policy, NULL);
7600                 if (err < 0)
7601                         goto err2;
7602         } else {
7603                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7604         }
7605
7606         if (type->select_ops) {
7607                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7608                 if (IS_ERR(ops)) {
7609                         err = PTR_ERR(ops);
7610                         goto err2;
7611                 }
7612         } else {
7613                 ops = type->ops;
7614         }
7615
7616         err = -ENOMEM;
7617         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7618         if (!obj)
7619                 goto err2;
7620
7621         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7622         if (err < 0)
7623                 goto err3;
7624
7625         obj->ops = ops;
7626
7627         kfree(tb);
7628         return obj;
7629 err3:
7630         kfree(obj);
7631 err2:
7632         kfree(tb);
7633 err1:
7634         return ERR_PTR(err);
7635 }
7636
7637 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7638                            struct nft_object *obj, bool reset)
7639 {
7640         struct nlattr *nest;
7641
7642         nest = nla_nest_start_noflag(skb, attr);
7643         if (!nest)
7644                 goto nla_put_failure;
7645         if (obj->ops->dump(skb, obj, reset) < 0)
7646                 goto nla_put_failure;
7647         nla_nest_end(skb, nest);
7648         return 0;
7649
7650 nla_put_failure:
7651         return -1;
7652 }
7653
7654 static const struct nft_object_type *__nft_obj_type_get(u32 objtype, u8 family)
7655 {
7656         const struct nft_object_type *type;
7657
7658         list_for_each_entry_rcu(type, &nf_tables_objects, list) {
7659                 if (type->family != NFPROTO_UNSPEC &&
7660                     type->family != family)
7661                         continue;
7662
7663                 if (objtype == type->type)
7664                         return type;
7665         }
7666         return NULL;
7667 }
7668
7669 static const struct nft_object_type *
7670 nft_obj_type_get(struct net *net, u32 objtype, u8 family)
7671 {
7672         const struct nft_object_type *type;
7673
7674         rcu_read_lock();
7675         type = __nft_obj_type_get(objtype, family);
7676         if (type != NULL && try_module_get(type->owner)) {
7677                 rcu_read_unlock();
7678                 return type;
7679         }
7680         rcu_read_unlock();
7681
7682         lockdep_nfnl_nft_mutex_not_held();
7683 #ifdef CONFIG_MODULES
7684         if (type == NULL) {
7685                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7686                         return ERR_PTR(-EAGAIN);
7687         }
7688 #endif
7689         return ERR_PTR(-ENOENT);
7690 }
7691
7692 static int nf_tables_updobj(const struct nft_ctx *ctx,
7693                             const struct nft_object_type *type,
7694                             const struct nlattr *attr,
7695                             struct nft_object *obj)
7696 {
7697         struct nft_object *newobj;
7698         struct nft_trans *trans;
7699         int err = -ENOMEM;
7700
7701         if (!try_module_get(type->owner))
7702                 return -ENOENT;
7703
7704         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7705                                 sizeof(struct nft_trans_obj));
7706         if (!trans)
7707                 goto err_trans;
7708
7709         newobj = nft_obj_init(ctx, type, attr);
7710         if (IS_ERR(newobj)) {
7711                 err = PTR_ERR(newobj);
7712                 goto err_free_trans;
7713         }
7714
7715         nft_trans_obj(trans) = obj;
7716         nft_trans_obj_update(trans) = true;
7717         nft_trans_obj_newobj(trans) = newobj;
7718         nft_trans_commit_list_add_tail(ctx->net, trans);
7719
7720         return 0;
7721
7722 err_free_trans:
7723         kfree(trans);
7724 err_trans:
7725         module_put(type->owner);
7726         return err;
7727 }
7728
7729 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7730                             const struct nlattr * const nla[])
7731 {
7732         struct netlink_ext_ack *extack = info->extack;
7733         u8 genmask = nft_genmask_next(info->net);
7734         u8 family = info->nfmsg->nfgen_family;
7735         const struct nft_object_type *type;
7736         struct net *net = info->net;
7737         struct nft_table *table;
7738         struct nft_object *obj;
7739         struct nft_ctx ctx;
7740         u32 objtype;
7741         int err;
7742
7743         if (!nla[NFTA_OBJ_TYPE] ||
7744             !nla[NFTA_OBJ_NAME] ||
7745             !nla[NFTA_OBJ_DATA])
7746                 return -EINVAL;
7747
7748         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7749                                  NETLINK_CB(skb).portid);
7750         if (IS_ERR(table)) {
7751                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7752                 return PTR_ERR(table);
7753         }
7754
7755         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7756         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7757         if (IS_ERR(obj)) {
7758                 err = PTR_ERR(obj);
7759                 if (err != -ENOENT) {
7760                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7761                         return err;
7762                 }
7763         } else {
7764                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7765                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7766                         return -EEXIST;
7767                 }
7768                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7769                         return -EOPNOTSUPP;
7770
7771                 type = __nft_obj_type_get(objtype, family);
7772                 if (WARN_ON_ONCE(!type))
7773                         return -ENOENT;
7774
7775                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7776
7777                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7778         }
7779
7780         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7781
7782         if (!nft_use_inc(&table->use))
7783                 return -EMFILE;
7784
7785         type = nft_obj_type_get(net, objtype, family);
7786         if (IS_ERR(type)) {
7787                 err = PTR_ERR(type);
7788                 goto err_type;
7789         }
7790
7791         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7792         if (IS_ERR(obj)) {
7793                 err = PTR_ERR(obj);
7794                 goto err_init;
7795         }
7796         obj->key.table = table;
7797         obj->handle = nf_tables_alloc_handle(table);
7798
7799         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7800         if (!obj->key.name) {
7801                 err = -ENOMEM;
7802                 goto err_strdup;
7803         }
7804
7805         if (nla[NFTA_OBJ_USERDATA]) {
7806                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7807                 if (obj->udata == NULL)
7808                         goto err_userdata;
7809
7810                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7811         }
7812
7813         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7814         if (err < 0)
7815                 goto err_trans;
7816
7817         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7818                               nft_objname_ht_params);
7819         if (err < 0)
7820                 goto err_obj_ht;
7821
7822         list_add_tail_rcu(&obj->list, &table->objects);
7823
7824         return 0;
7825 err_obj_ht:
7826         /* queued in transaction log */
7827         INIT_LIST_HEAD(&obj->list);
7828         return err;
7829 err_trans:
7830         kfree(obj->udata);
7831 err_userdata:
7832         kfree(obj->key.name);
7833 err_strdup:
7834         if (obj->ops->destroy)
7835                 obj->ops->destroy(&ctx, obj);
7836         kfree(obj);
7837 err_init:
7838         module_put(type->owner);
7839 err_type:
7840         nft_use_dec_restore(&table->use);
7841
7842         return err;
7843 }
7844
7845 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7846                                    u32 portid, u32 seq, int event, u32 flags,
7847                                    int family, const struct nft_table *table,
7848                                    struct nft_object *obj, bool reset)
7849 {
7850         struct nlmsghdr *nlh;
7851
7852         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7853         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7854                            NFNETLINK_V0, nft_base_seq(net));
7855         if (!nlh)
7856                 goto nla_put_failure;
7857
7858         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7859             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7860             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7861                          NFTA_OBJ_PAD))
7862                 goto nla_put_failure;
7863
7864         if (event == NFT_MSG_DELOBJ) {
7865                 nlmsg_end(skb, nlh);
7866                 return 0;
7867         }
7868
7869         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7870             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7871             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7872                 goto nla_put_failure;
7873
7874         if (obj->udata &&
7875             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7876                 goto nla_put_failure;
7877
7878         nlmsg_end(skb, nlh);
7879         return 0;
7880
7881 nla_put_failure:
7882         nlmsg_trim(skb, nlh);
7883         return -1;
7884 }
7885
7886 static void audit_log_obj_reset(const struct nft_table *table,
7887                                 unsigned int base_seq, unsigned int nentries)
7888 {
7889         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7890
7891         audit_log_nfcfg(buf, table->family, nentries,
7892                         AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7893         kfree(buf);
7894 }
7895
7896 struct nft_obj_dump_ctx {
7897         unsigned int    s_idx;
7898         char            *table;
7899         u32             type;
7900         bool            reset;
7901 };
7902
7903 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7904 {
7905         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7906         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7907         struct net *net = sock_net(skb->sk);
7908         int family = nfmsg->nfgen_family;
7909         struct nftables_pernet *nft_net;
7910         const struct nft_table *table;
7911         unsigned int entries = 0;
7912         struct nft_object *obj;
7913         unsigned int idx = 0;
7914         int rc = 0;
7915
7916         rcu_read_lock();
7917         nft_net = nft_pernet(net);
7918         cb->seq = READ_ONCE(nft_net->base_seq);
7919
7920         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7921                 if (family != NFPROTO_UNSPEC && family != table->family)
7922                         continue;
7923
7924                 entries = 0;
7925                 list_for_each_entry_rcu(obj, &table->objects, list) {
7926                         if (!nft_is_active(net, obj))
7927                                 goto cont;
7928                         if (idx < ctx->s_idx)
7929                                 goto cont;
7930                         if (ctx->table && strcmp(ctx->table, table->name))
7931                                 goto cont;
7932                         if (ctx->type != NFT_OBJECT_UNSPEC &&
7933                             obj->ops->type->type != ctx->type)
7934                                 goto cont;
7935
7936                         rc = nf_tables_fill_obj_info(skb, net,
7937                                                      NETLINK_CB(cb->skb).portid,
7938                                                      cb->nlh->nlmsg_seq,
7939                                                      NFT_MSG_NEWOBJ,
7940                                                      NLM_F_MULTI | NLM_F_APPEND,
7941                                                      table->family, table,
7942                                                      obj, ctx->reset);
7943                         if (rc < 0)
7944                                 break;
7945
7946                         entries++;
7947                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7948 cont:
7949                         idx++;
7950                 }
7951                 if (ctx->reset && entries)
7952                         audit_log_obj_reset(table, nft_net->base_seq, entries);
7953                 if (rc < 0)
7954                         break;
7955         }
7956         rcu_read_unlock();
7957
7958         ctx->s_idx = idx;
7959         return skb->len;
7960 }
7961
7962 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7963 {
7964         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7965         const struct nlattr * const *nla = cb->data;
7966
7967         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
7968
7969         if (nla[NFTA_OBJ_TABLE]) {
7970                 ctx->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7971                 if (!ctx->table)
7972                         return -ENOMEM;
7973         }
7974
7975         if (nla[NFTA_OBJ_TYPE])
7976                 ctx->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7977
7978         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7979                 ctx->reset = true;
7980
7981         return 0;
7982 }
7983
7984 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7985 {
7986         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7987
7988         kfree(ctx->table);
7989
7990         return 0;
7991 }
7992
7993 /* called with rcu_read_lock held */
7994 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7995                             const struct nlattr * const nla[])
7996 {
7997         struct netlink_ext_ack *extack = info->extack;
7998         u8 genmask = nft_genmask_cur(info->net);
7999         u8 family = info->nfmsg->nfgen_family;
8000         const struct nft_table *table;
8001         struct net *net = info->net;
8002         struct nft_object *obj;
8003         struct sk_buff *skb2;
8004         bool reset = false;
8005         u32 objtype;
8006         int err;
8007
8008         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8009                 struct netlink_dump_control c = {
8010                         .start = nf_tables_dump_obj_start,
8011                         .dump = nf_tables_dump_obj,
8012                         .done = nf_tables_dump_obj_done,
8013                         .module = THIS_MODULE,
8014                         .data = (void *)nla,
8015                 };
8016
8017                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8018         }
8019
8020         if (!nla[NFTA_OBJ_NAME] ||
8021             !nla[NFTA_OBJ_TYPE])
8022                 return -EINVAL;
8023
8024         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
8025         if (IS_ERR(table)) {
8026                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
8027                 return PTR_ERR(table);
8028         }
8029
8030         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8031         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
8032         if (IS_ERR(obj)) {
8033                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
8034                 return PTR_ERR(obj);
8035         }
8036
8037         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8038         if (!skb2)
8039                 return -ENOMEM;
8040
8041         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
8042                 reset = true;
8043
8044         if (reset) {
8045                 const struct nftables_pernet *nft_net;
8046                 char *buf;
8047
8048                 nft_net = nft_pernet(net);
8049                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
8050
8051                 audit_log_nfcfg(buf,
8052                                 family,
8053                                 1,
8054                                 AUDIT_NFT_OP_OBJ_RESET,
8055                                 GFP_ATOMIC);
8056                 kfree(buf);
8057         }
8058
8059         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
8060                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
8061                                       family, table, obj, reset);
8062         if (err < 0)
8063                 goto err_fill_obj_info;
8064
8065         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8066
8067 err_fill_obj_info:
8068         kfree_skb(skb2);
8069         return err;
8070 }
8071
8072 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
8073 {
8074         if (obj->ops->destroy)
8075                 obj->ops->destroy(ctx, obj);
8076
8077         module_put(obj->ops->type->owner);
8078         kfree(obj->key.name);
8079         kfree(obj->udata);
8080         kfree(obj);
8081 }
8082
8083 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
8084                             const struct nlattr * const nla[])
8085 {
8086         struct netlink_ext_ack *extack = info->extack;
8087         u8 genmask = nft_genmask_next(info->net);
8088         u8 family = info->nfmsg->nfgen_family;
8089         struct net *net = info->net;
8090         const struct nlattr *attr;
8091         struct nft_table *table;
8092         struct nft_object *obj;
8093         struct nft_ctx ctx;
8094         u32 objtype;
8095
8096         if (!nla[NFTA_OBJ_TYPE] ||
8097             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
8098                 return -EINVAL;
8099
8100         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
8101                                  NETLINK_CB(skb).portid);
8102         if (IS_ERR(table)) {
8103                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
8104                 return PTR_ERR(table);
8105         }
8106
8107         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8108         if (nla[NFTA_OBJ_HANDLE]) {
8109                 attr = nla[NFTA_OBJ_HANDLE];
8110                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
8111         } else {
8112                 attr = nla[NFTA_OBJ_NAME];
8113                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
8114         }
8115
8116         if (IS_ERR(obj)) {
8117                 if (PTR_ERR(obj) == -ENOENT &&
8118                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
8119                         return 0;
8120
8121                 NL_SET_BAD_ATTR(extack, attr);
8122                 return PTR_ERR(obj);
8123         }
8124         if (obj->use > 0) {
8125                 NL_SET_BAD_ATTR(extack, attr);
8126                 return -EBUSY;
8127         }
8128
8129         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8130
8131         return nft_delobj(&ctx, obj);
8132 }
8133
8134 static void
8135 __nft_obj_notify(struct net *net, const struct nft_table *table,
8136                  struct nft_object *obj, u32 portid, u32 seq, int event,
8137                  u16 flags, int family, int report, gfp_t gfp)
8138 {
8139         struct nftables_pernet *nft_net = nft_pernet(net);
8140         struct sk_buff *skb;
8141         int err;
8142
8143         if (!report &&
8144             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8145                 return;
8146
8147         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
8148         if (skb == NULL)
8149                 goto err;
8150
8151         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
8152                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
8153                                       family, table, obj, false);
8154         if (err < 0) {
8155                 kfree_skb(skb);
8156                 goto err;
8157         }
8158
8159         nft_notify_enqueue(skb, report, &nft_net->notify_list);
8160         return;
8161 err:
8162         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
8163 }
8164
8165 void nft_obj_notify(struct net *net, const struct nft_table *table,
8166                     struct nft_object *obj, u32 portid, u32 seq, int event,
8167                     u16 flags, int family, int report, gfp_t gfp)
8168 {
8169         struct nftables_pernet *nft_net = nft_pernet(net);
8170         char *buf = kasprintf(gfp, "%s:%u",
8171                               table->name, nft_net->base_seq);
8172
8173         audit_log_nfcfg(buf,
8174                         family,
8175                         obj->handle,
8176                         event == NFT_MSG_NEWOBJ ?
8177                                  AUDIT_NFT_OP_OBJ_REGISTER :
8178                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
8179                         gfp);
8180         kfree(buf);
8181
8182         __nft_obj_notify(net, table, obj, portid, seq, event,
8183                          flags, family, report, gfp);
8184 }
8185 EXPORT_SYMBOL_GPL(nft_obj_notify);
8186
8187 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
8188                                  struct nft_object *obj, int event)
8189 {
8190         __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
8191                          ctx->seq, event, ctx->flags, ctx->family,
8192                          ctx->report, GFP_KERNEL);
8193 }
8194
8195 /*
8196  * Flow tables
8197  */
8198 void nft_register_flowtable_type(struct nf_flowtable_type *type)
8199 {
8200         nfnl_lock(NFNL_SUBSYS_NFTABLES);
8201         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
8202         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8203 }
8204 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
8205
8206 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
8207 {
8208         nfnl_lock(NFNL_SUBSYS_NFTABLES);
8209         list_del_rcu(&type->list);
8210         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8211 }
8212 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
8213
8214 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
8215         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
8216                                             .len = NFT_NAME_MAXLEN - 1 },
8217         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
8218                                             .len = NFT_NAME_MAXLEN - 1 },
8219         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
8220         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
8221         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
8222 };
8223
8224 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
8225                                            const struct nlattr *nla, u8 genmask)
8226 {
8227         struct nft_flowtable *flowtable;
8228
8229         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8230                 if (!nla_strcmp(nla, flowtable->name) &&
8231                     nft_active_genmask(flowtable, genmask))
8232                         return flowtable;
8233         }
8234         return ERR_PTR(-ENOENT);
8235 }
8236 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8237
8238 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8239                                     struct nft_flowtable *flowtable,
8240                                     enum nft_trans_phase phase)
8241 {
8242         switch (phase) {
8243         case NFT_TRANS_PREPARE_ERROR:
8244         case NFT_TRANS_PREPARE:
8245         case NFT_TRANS_ABORT:
8246         case NFT_TRANS_RELEASE:
8247                 nft_use_dec(&flowtable->use);
8248                 fallthrough;
8249         default:
8250                 return;
8251         }
8252 }
8253 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8254
8255 static struct nft_flowtable *
8256 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8257                               const struct nlattr *nla, u8 genmask)
8258 {
8259        struct nft_flowtable *flowtable;
8260
8261        list_for_each_entry(flowtable, &table->flowtables, list) {
8262                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8263                    nft_active_genmask(flowtable, genmask))
8264                        return flowtable;
8265        }
8266        return ERR_PTR(-ENOENT);
8267 }
8268
8269 struct nft_flowtable_hook {
8270         u32                     num;
8271         int                     priority;
8272         struct list_head        list;
8273 };
8274
8275 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8276         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
8277         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
8278         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
8279 };
8280
8281 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8282                                     const struct nlattr * const nla[],
8283                                     struct nft_flowtable_hook *flowtable_hook,
8284                                     struct nft_flowtable *flowtable,
8285                                     struct netlink_ext_ack *extack, bool add)
8286 {
8287         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8288         struct nft_hook *hook;
8289         int hooknum, priority;
8290         int err;
8291
8292         INIT_LIST_HEAD(&flowtable_hook->list);
8293
8294         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8295                                           nla[NFTA_FLOWTABLE_HOOK],
8296                                           nft_flowtable_hook_policy, NULL);
8297         if (err < 0)
8298                 return err;
8299
8300         if (add) {
8301                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8302                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8303                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8304                         return -ENOENT;
8305                 }
8306
8307                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8308                 if (hooknum != NF_NETDEV_INGRESS)
8309                         return -EOPNOTSUPP;
8310
8311                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8312
8313                 flowtable_hook->priority        = priority;
8314                 flowtable_hook->num             = hooknum;
8315         } else {
8316                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8317                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8318                         if (hooknum != flowtable->hooknum)
8319                                 return -EOPNOTSUPP;
8320                 }
8321
8322                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8323                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8324                         if (priority != flowtable->data.priority)
8325                                 return -EOPNOTSUPP;
8326                 }
8327
8328                 flowtable_hook->priority        = flowtable->data.priority;
8329                 flowtable_hook->num             = flowtable->hooknum;
8330         }
8331
8332         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8333                 err = nf_tables_parse_netdev_hooks(ctx->net,
8334                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
8335                                                    &flowtable_hook->list,
8336                                                    extack);
8337                 if (err < 0)
8338                         return err;
8339         }
8340
8341         list_for_each_entry(hook, &flowtable_hook->list, list) {
8342                 hook->ops.pf            = NFPROTO_NETDEV;
8343                 hook->ops.hooknum       = flowtable_hook->num;
8344                 hook->ops.priority      = flowtable_hook->priority;
8345                 hook->ops.priv          = &flowtable->data;
8346                 hook->ops.hook          = flowtable->data.type->hook;
8347         }
8348
8349         return err;
8350 }
8351
8352 /* call under rcu_read_lock */
8353 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8354 {
8355         const struct nf_flowtable_type *type;
8356
8357         list_for_each_entry_rcu(type, &nf_tables_flowtables, list) {
8358                 if (family == type->family)
8359                         return type;
8360         }
8361         return NULL;
8362 }
8363
8364 static const struct nf_flowtable_type *
8365 nft_flowtable_type_get(struct net *net, u8 family)
8366 {
8367         const struct nf_flowtable_type *type;
8368
8369         rcu_read_lock();
8370         type = __nft_flowtable_type_get(family);
8371         if (type != NULL && try_module_get(type->owner)) {
8372                 rcu_read_unlock();
8373                 return type;
8374         }
8375         rcu_read_unlock();
8376
8377         lockdep_nfnl_nft_mutex_not_held();
8378 #ifdef CONFIG_MODULES
8379         if (type == NULL) {
8380                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8381                         return ERR_PTR(-EAGAIN);
8382         }
8383 #endif
8384         return ERR_PTR(-ENOENT);
8385 }
8386
8387 /* Only called from error and netdev event paths. */
8388 static void nft_unregister_flowtable_hook(struct net *net,
8389                                           struct nft_flowtable *flowtable,
8390                                           struct nft_hook *hook)
8391 {
8392         nf_unregister_net_hook(net, &hook->ops);
8393         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8394                                     FLOW_BLOCK_UNBIND);
8395 }
8396
8397 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8398                                                  struct list_head *hook_list,
8399                                                  bool release_netdev)
8400 {
8401         struct nft_hook *hook, *next;
8402
8403         list_for_each_entry_safe(hook, next, hook_list, list) {
8404                 nf_unregister_net_hook(net, &hook->ops);
8405                 if (release_netdev) {
8406                         list_del(&hook->list);
8407                         kfree_rcu(hook, rcu);
8408                 }
8409         }
8410 }
8411
8412 static void nft_unregister_flowtable_net_hooks(struct net *net,
8413                                                struct list_head *hook_list)
8414 {
8415         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8416 }
8417
8418 static int nft_register_flowtable_net_hooks(struct net *net,
8419                                             struct nft_table *table,
8420                                             struct list_head *hook_list,
8421                                             struct nft_flowtable *flowtable)
8422 {
8423         struct nft_hook *hook, *hook2, *next;
8424         struct nft_flowtable *ft;
8425         int err, i = 0;
8426
8427         list_for_each_entry(hook, hook_list, list) {
8428                 list_for_each_entry(ft, &table->flowtables, list) {
8429                         if (!nft_is_active_next(net, ft))
8430                                 continue;
8431
8432                         list_for_each_entry(hook2, &ft->hook_list, list) {
8433                                 if (hook->ops.dev == hook2->ops.dev &&
8434                                     hook->ops.pf == hook2->ops.pf) {
8435                                         err = -EEXIST;
8436                                         goto err_unregister_net_hooks;
8437                                 }
8438                         }
8439                 }
8440
8441                 err = flowtable->data.type->setup(&flowtable->data,
8442                                                   hook->ops.dev,
8443                                                   FLOW_BLOCK_BIND);
8444                 if (err < 0)
8445                         goto err_unregister_net_hooks;
8446
8447                 err = nf_register_net_hook(net, &hook->ops);
8448                 if (err < 0) {
8449                         flowtable->data.type->setup(&flowtable->data,
8450                                                     hook->ops.dev,
8451                                                     FLOW_BLOCK_UNBIND);
8452                         goto err_unregister_net_hooks;
8453                 }
8454
8455                 i++;
8456         }
8457
8458         return 0;
8459
8460 err_unregister_net_hooks:
8461         list_for_each_entry_safe(hook, next, hook_list, list) {
8462                 if (i-- <= 0)
8463                         break;
8464
8465                 nft_unregister_flowtable_hook(net, flowtable, hook);
8466                 list_del_rcu(&hook->list);
8467                 kfree_rcu(hook, rcu);
8468         }
8469
8470         return err;
8471 }
8472
8473 static void nft_hooks_destroy(struct list_head *hook_list)
8474 {
8475         struct nft_hook *hook, *next;
8476
8477         list_for_each_entry_safe(hook, next, hook_list, list) {
8478                 list_del_rcu(&hook->list);
8479                 kfree_rcu(hook, rcu);
8480         }
8481 }
8482
8483 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8484                                 struct nft_flowtable *flowtable,
8485                                 struct netlink_ext_ack *extack)
8486 {
8487         const struct nlattr * const *nla = ctx->nla;
8488         struct nft_flowtable_hook flowtable_hook;
8489         struct nft_hook *hook, *next;
8490         struct nft_trans *trans;
8491         bool unregister = false;
8492         u32 flags;
8493         int err;
8494
8495         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8496                                        extack, false);
8497         if (err < 0)
8498                 return err;
8499
8500         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8501                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8502                         list_del(&hook->list);
8503                         kfree(hook);
8504                 }
8505         }
8506
8507         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8508                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8509                 if (flags & ~NFT_FLOWTABLE_MASK) {
8510                         err = -EOPNOTSUPP;
8511                         goto err_flowtable_update_hook;
8512                 }
8513                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8514                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8515                         err = -EOPNOTSUPP;
8516                         goto err_flowtable_update_hook;
8517                 }
8518         } else {
8519                 flags = flowtable->data.flags;
8520         }
8521
8522         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8523                                                &flowtable_hook.list, flowtable);
8524         if (err < 0)
8525                 goto err_flowtable_update_hook;
8526
8527         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8528                                 sizeof(struct nft_trans_flowtable));
8529         if (!trans) {
8530                 unregister = true;
8531                 err = -ENOMEM;
8532                 goto err_flowtable_update_hook;
8533         }
8534
8535         nft_trans_flowtable_flags(trans) = flags;
8536         nft_trans_flowtable(trans) = flowtable;
8537         nft_trans_flowtable_update(trans) = true;
8538         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8539         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8540
8541         nft_trans_commit_list_add_tail(ctx->net, trans);
8542
8543         return 0;
8544
8545 err_flowtable_update_hook:
8546         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8547                 if (unregister)
8548                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8549                 list_del_rcu(&hook->list);
8550                 kfree_rcu(hook, rcu);
8551         }
8552
8553         return err;
8554
8555 }
8556
8557 static int nf_tables_newflowtable(struct sk_buff *skb,
8558                                   const struct nfnl_info *info,
8559                                   const struct nlattr * const nla[])
8560 {
8561         struct netlink_ext_ack *extack = info->extack;
8562         struct nft_flowtable_hook flowtable_hook;
8563         u8 genmask = nft_genmask_next(info->net);
8564         u8 family = info->nfmsg->nfgen_family;
8565         const struct nf_flowtable_type *type;
8566         struct nft_flowtable *flowtable;
8567         struct net *net = info->net;
8568         struct nft_table *table;
8569         struct nft_trans *trans;
8570         struct nft_ctx ctx;
8571         int err;
8572
8573         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8574             !nla[NFTA_FLOWTABLE_NAME] ||
8575             !nla[NFTA_FLOWTABLE_HOOK])
8576                 return -EINVAL;
8577
8578         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8579                                  genmask, NETLINK_CB(skb).portid);
8580         if (IS_ERR(table)) {
8581                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8582                 return PTR_ERR(table);
8583         }
8584
8585         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8586                                          genmask);
8587         if (IS_ERR(flowtable)) {
8588                 err = PTR_ERR(flowtable);
8589                 if (err != -ENOENT) {
8590                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8591                         return err;
8592                 }
8593         } else {
8594                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8595                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8596                         return -EEXIST;
8597                 }
8598
8599                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8600
8601                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8602         }
8603
8604         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8605
8606         if (!nft_use_inc(&table->use))
8607                 return -EMFILE;
8608
8609         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8610         if (!flowtable) {
8611                 err = -ENOMEM;
8612                 goto flowtable_alloc;
8613         }
8614
8615         flowtable->table = table;
8616         flowtable->handle = nf_tables_alloc_handle(table);
8617         INIT_LIST_HEAD(&flowtable->hook_list);
8618
8619         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8620         if (!flowtable->name) {
8621                 err = -ENOMEM;
8622                 goto err1;
8623         }
8624
8625         type = nft_flowtable_type_get(net, family);
8626         if (IS_ERR(type)) {
8627                 err = PTR_ERR(type);
8628                 goto err2;
8629         }
8630
8631         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8632                 flowtable->data.flags =
8633                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8634                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8635                         err = -EOPNOTSUPP;
8636                         goto err3;
8637                 }
8638         }
8639
8640         write_pnet(&flowtable->data.net, net);
8641         flowtable->data.type = type;
8642         err = type->init(&flowtable->data);
8643         if (err < 0)
8644                 goto err3;
8645
8646         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8647                                        extack, true);
8648         if (err < 0)
8649                 goto err_flowtable_parse_hooks;
8650
8651         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8652         flowtable->data.priority = flowtable_hook.priority;
8653         flowtable->hooknum = flowtable_hook.num;
8654
8655         trans = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8656         if (IS_ERR(trans)) {
8657                 err = PTR_ERR(trans);
8658                 goto err_flowtable_trans;
8659         }
8660
8661         /* This must be LAST to ensure no packets are walking over this flowtable. */
8662         err = nft_register_flowtable_net_hooks(ctx.net, table,
8663                                                &flowtable->hook_list,
8664                                                flowtable);
8665         if (err < 0)
8666                 goto err_flowtable_hooks;
8667
8668         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8669
8670         return 0;
8671
8672 err_flowtable_hooks:
8673         nft_trans_destroy(trans);
8674 err_flowtable_trans:
8675         nft_hooks_destroy(&flowtable->hook_list);
8676 err_flowtable_parse_hooks:
8677         flowtable->data.type->free(&flowtable->data);
8678 err3:
8679         module_put(type->owner);
8680 err2:
8681         kfree(flowtable->name);
8682 err1:
8683         kfree(flowtable);
8684 flowtable_alloc:
8685         nft_use_dec_restore(&table->use);
8686
8687         return err;
8688 }
8689
8690 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8691 {
8692         struct nft_hook *this, *next;
8693
8694         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8695                 list_del(&this->list);
8696                 kfree(this);
8697         }
8698 }
8699
8700 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8701                                  struct nft_flowtable *flowtable,
8702                                  struct netlink_ext_ack *extack)
8703 {
8704         const struct nlattr * const *nla = ctx->nla;
8705         struct nft_flowtable_hook flowtable_hook;
8706         LIST_HEAD(flowtable_del_list);
8707         struct nft_hook *this, *hook;
8708         struct nft_trans *trans;
8709         int err;
8710
8711         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8712                                        extack, false);
8713         if (err < 0)
8714                 return err;
8715
8716         list_for_each_entry(this, &flowtable_hook.list, list) {
8717                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8718                 if (!hook) {
8719                         err = -ENOENT;
8720                         goto err_flowtable_del_hook;
8721                 }
8722                 list_move(&hook->list, &flowtable_del_list);
8723         }
8724
8725         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8726                                 sizeof(struct nft_trans_flowtable));
8727         if (!trans) {
8728                 err = -ENOMEM;
8729                 goto err_flowtable_del_hook;
8730         }
8731
8732         nft_trans_flowtable(trans) = flowtable;
8733         nft_trans_flowtable_update(trans) = true;
8734         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8735         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8736         nft_flowtable_hook_release(&flowtable_hook);
8737
8738         nft_trans_commit_list_add_tail(ctx->net, trans);
8739
8740         return 0;
8741
8742 err_flowtable_del_hook:
8743         list_splice(&flowtable_del_list, &flowtable->hook_list);
8744         nft_flowtable_hook_release(&flowtable_hook);
8745
8746         return err;
8747 }
8748
8749 static int nf_tables_delflowtable(struct sk_buff *skb,
8750                                   const struct nfnl_info *info,
8751                                   const struct nlattr * const nla[])
8752 {
8753         struct netlink_ext_ack *extack = info->extack;
8754         u8 genmask = nft_genmask_next(info->net);
8755         u8 family = info->nfmsg->nfgen_family;
8756         struct nft_flowtable *flowtable;
8757         struct net *net = info->net;
8758         const struct nlattr *attr;
8759         struct nft_table *table;
8760         struct nft_ctx ctx;
8761
8762         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8763             (!nla[NFTA_FLOWTABLE_NAME] &&
8764              !nla[NFTA_FLOWTABLE_HANDLE]))
8765                 return -EINVAL;
8766
8767         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8768                                  genmask, NETLINK_CB(skb).portid);
8769         if (IS_ERR(table)) {
8770                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8771                 return PTR_ERR(table);
8772         }
8773
8774         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8775                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8776                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8777         } else {
8778                 attr = nla[NFTA_FLOWTABLE_NAME];
8779                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8780         }
8781
8782         if (IS_ERR(flowtable)) {
8783                 if (PTR_ERR(flowtable) == -ENOENT &&
8784                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8785                         return 0;
8786
8787                 NL_SET_BAD_ATTR(extack, attr);
8788                 return PTR_ERR(flowtable);
8789         }
8790
8791         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8792
8793         if (nla[NFTA_FLOWTABLE_HOOK])
8794                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8795
8796         if (flowtable->use > 0) {
8797                 NL_SET_BAD_ATTR(extack, attr);
8798                 return -EBUSY;
8799         }
8800
8801         return nft_delflowtable(&ctx, flowtable);
8802 }
8803
8804 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8805                                          u32 portid, u32 seq, int event,
8806                                          u32 flags, int family,
8807                                          struct nft_flowtable *flowtable,
8808                                          struct list_head *hook_list)
8809 {
8810         struct nlattr *nest, *nest_devs;
8811         struct nft_hook *hook;
8812         struct nlmsghdr *nlh;
8813
8814         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8815         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8816                            NFNETLINK_V0, nft_base_seq(net));
8817         if (!nlh)
8818                 goto nla_put_failure;
8819
8820         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8821             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8822             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8823                          NFTA_FLOWTABLE_PAD))
8824                 goto nla_put_failure;
8825
8826         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8827                 nlmsg_end(skb, nlh);
8828                 return 0;
8829         }
8830
8831         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8832             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8833                 goto nla_put_failure;
8834
8835         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8836         if (!nest)
8837                 goto nla_put_failure;
8838         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8839             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8840                 goto nla_put_failure;
8841
8842         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8843         if (!nest_devs)
8844                 goto nla_put_failure;
8845
8846         if (!hook_list)
8847                 hook_list = &flowtable->hook_list;
8848
8849         list_for_each_entry_rcu(hook, hook_list, list) {
8850                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8851                         goto nla_put_failure;
8852         }
8853         nla_nest_end(skb, nest_devs);
8854         nla_nest_end(skb, nest);
8855
8856         nlmsg_end(skb, nlh);
8857         return 0;
8858
8859 nla_put_failure:
8860         nlmsg_trim(skb, nlh);
8861         return -1;
8862 }
8863
8864 struct nft_flowtable_filter {
8865         char            *table;
8866 };
8867
8868 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8869                                     struct netlink_callback *cb)
8870 {
8871         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8872         struct nft_flowtable_filter *filter = cb->data;
8873         unsigned int idx = 0, s_idx = cb->args[0];
8874         struct net *net = sock_net(skb->sk);
8875         int family = nfmsg->nfgen_family;
8876         struct nft_flowtable *flowtable;
8877         struct nftables_pernet *nft_net;
8878         const struct nft_table *table;
8879
8880         rcu_read_lock();
8881         nft_net = nft_pernet(net);
8882         cb->seq = READ_ONCE(nft_net->base_seq);
8883
8884         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8885                 if (family != NFPROTO_UNSPEC && family != table->family)
8886                         continue;
8887
8888                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8889                         if (!nft_is_active(net, flowtable))
8890                                 goto cont;
8891                         if (idx < s_idx)
8892                                 goto cont;
8893                         if (idx > s_idx)
8894                                 memset(&cb->args[1], 0,
8895                                        sizeof(cb->args) - sizeof(cb->args[0]));
8896                         if (filter && filter->table &&
8897                             strcmp(filter->table, table->name))
8898                                 goto cont;
8899
8900                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8901                                                           cb->nlh->nlmsg_seq,
8902                                                           NFT_MSG_NEWFLOWTABLE,
8903                                                           NLM_F_MULTI | NLM_F_APPEND,
8904                                                           table->family,
8905                                                           flowtable, NULL) < 0)
8906                                 goto done;
8907
8908                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8909 cont:
8910                         idx++;
8911                 }
8912         }
8913 done:
8914         rcu_read_unlock();
8915
8916         cb->args[0] = idx;
8917         return skb->len;
8918 }
8919
8920 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8921 {
8922         const struct nlattr * const *nla = cb->data;
8923         struct nft_flowtable_filter *filter = NULL;
8924
8925         if (nla[NFTA_FLOWTABLE_TABLE]) {
8926                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8927                 if (!filter)
8928                         return -ENOMEM;
8929
8930                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8931                                            GFP_ATOMIC);
8932                 if (!filter->table) {
8933                         kfree(filter);
8934                         return -ENOMEM;
8935                 }
8936         }
8937
8938         cb->data = filter;
8939         return 0;
8940 }
8941
8942 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8943 {
8944         struct nft_flowtable_filter *filter = cb->data;
8945
8946         if (!filter)
8947                 return 0;
8948
8949         kfree(filter->table);
8950         kfree(filter);
8951
8952         return 0;
8953 }
8954
8955 /* called with rcu_read_lock held */
8956 static int nf_tables_getflowtable(struct sk_buff *skb,
8957                                   const struct nfnl_info *info,
8958                                   const struct nlattr * const nla[])
8959 {
8960         struct netlink_ext_ack *extack = info->extack;
8961         u8 genmask = nft_genmask_cur(info->net);
8962         u8 family = info->nfmsg->nfgen_family;
8963         struct nft_flowtable *flowtable;
8964         const struct nft_table *table;
8965         struct net *net = info->net;
8966         struct sk_buff *skb2;
8967         int err;
8968
8969         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8970                 struct netlink_dump_control c = {
8971                         .start = nf_tables_dump_flowtable_start,
8972                         .dump = nf_tables_dump_flowtable,
8973                         .done = nf_tables_dump_flowtable_done,
8974                         .module = THIS_MODULE,
8975                         .data = (void *)nla,
8976                 };
8977
8978                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8979         }
8980
8981         if (!nla[NFTA_FLOWTABLE_NAME])
8982                 return -EINVAL;
8983
8984         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8985                                  genmask, 0);
8986         if (IS_ERR(table)) {
8987                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8988                 return PTR_ERR(table);
8989         }
8990
8991         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8992                                          genmask);
8993         if (IS_ERR(flowtable)) {
8994                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8995                 return PTR_ERR(flowtable);
8996         }
8997
8998         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8999         if (!skb2)
9000                 return -ENOMEM;
9001
9002         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
9003                                             info->nlh->nlmsg_seq,
9004                                             NFT_MSG_NEWFLOWTABLE, 0, family,
9005                                             flowtable, NULL);
9006         if (err < 0)
9007                 goto err_fill_flowtable_info;
9008
9009         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
9010
9011 err_fill_flowtable_info:
9012         kfree_skb(skb2);
9013         return err;
9014 }
9015
9016 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
9017                                        struct nft_flowtable *flowtable,
9018                                        struct list_head *hook_list, int event)
9019 {
9020         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
9021         struct sk_buff *skb;
9022         u16 flags = 0;
9023         int err;
9024
9025         if (!ctx->report &&
9026             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
9027                 return;
9028
9029         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
9030         if (skb == NULL)
9031                 goto err;
9032
9033         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
9034                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
9035
9036         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
9037                                             ctx->seq, event, flags,
9038                                             ctx->family, flowtable, hook_list);
9039         if (err < 0) {
9040                 kfree_skb(skb);
9041                 goto err;
9042         }
9043
9044         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
9045         return;
9046 err:
9047         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
9048 }
9049
9050 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
9051 {
9052         struct nft_hook *hook, *next;
9053
9054         flowtable->data.type->free(&flowtable->data);
9055         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
9056                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
9057                                             FLOW_BLOCK_UNBIND);
9058                 list_del_rcu(&hook->list);
9059                 kfree(hook);
9060         }
9061         kfree(flowtable->name);
9062         module_put(flowtable->data.type->owner);
9063         kfree(flowtable);
9064 }
9065
9066 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
9067                                    u32 portid, u32 seq)
9068 {
9069         struct nftables_pernet *nft_net = nft_pernet(net);
9070         struct nlmsghdr *nlh;
9071         char buf[TASK_COMM_LEN];
9072         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
9073
9074         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
9075                            NFNETLINK_V0, nft_base_seq(net));
9076         if (!nlh)
9077                 goto nla_put_failure;
9078
9079         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
9080             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
9081             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
9082                 goto nla_put_failure;
9083
9084         nlmsg_end(skb, nlh);
9085         return 0;
9086
9087 nla_put_failure:
9088         nlmsg_trim(skb, nlh);
9089         return -EMSGSIZE;
9090 }
9091
9092 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
9093                                 struct nft_flowtable *flowtable)
9094 {
9095         struct nft_hook *hook;
9096
9097         list_for_each_entry(hook, &flowtable->hook_list, list) {
9098                 if (hook->ops.dev != dev)
9099                         continue;
9100
9101                 /* flow_offload_netdev_event() cleans up entries for us. */
9102                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
9103                 list_del_rcu(&hook->list);
9104                 kfree_rcu(hook, rcu);
9105                 break;
9106         }
9107 }
9108
9109 static int nf_tables_flowtable_event(struct notifier_block *this,
9110                                      unsigned long event, void *ptr)
9111 {
9112         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
9113         struct nft_flowtable *flowtable;
9114         struct nftables_pernet *nft_net;
9115         struct nft_table *table;
9116         struct net *net;
9117
9118         if (event != NETDEV_UNREGISTER)
9119                 return 0;
9120
9121         net = dev_net(dev);
9122         nft_net = nft_pernet(net);
9123         mutex_lock(&nft_net->commit_mutex);
9124         list_for_each_entry(table, &nft_net->tables, list) {
9125                 list_for_each_entry(flowtable, &table->flowtables, list) {
9126                         nft_flowtable_event(event, dev, flowtable);
9127                 }
9128         }
9129         mutex_unlock(&nft_net->commit_mutex);
9130
9131         return NOTIFY_DONE;
9132 }
9133
9134 static struct notifier_block nf_tables_flowtable_notifier = {
9135         .notifier_call  = nf_tables_flowtable_event,
9136 };
9137
9138 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
9139                                  int event)
9140 {
9141         struct nlmsghdr *nlh = nlmsg_hdr(skb);
9142         struct sk_buff *skb2;
9143         int err;
9144
9145         if (!nlmsg_report(nlh) &&
9146             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
9147                 return;
9148
9149         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
9150         if (skb2 == NULL)
9151                 goto err;
9152
9153         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
9154                                       nlh->nlmsg_seq);
9155         if (err < 0) {
9156                 kfree_skb(skb2);
9157                 goto err;
9158         }
9159
9160         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9161                        nlmsg_report(nlh), GFP_KERNEL);
9162         return;
9163 err:
9164         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9165                           -ENOBUFS);
9166 }
9167
9168 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
9169                             const struct nlattr * const nla[])
9170 {
9171         struct sk_buff *skb2;
9172         int err;
9173
9174         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
9175         if (skb2 == NULL)
9176                 return -ENOMEM;
9177
9178         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
9179                                       info->nlh->nlmsg_seq);
9180         if (err < 0)
9181                 goto err_fill_gen_info;
9182
9183         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
9184
9185 err_fill_gen_info:
9186         kfree_skb(skb2);
9187         return err;
9188 }
9189
9190 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
9191         [NFT_MSG_NEWTABLE] = {
9192                 .call           = nf_tables_newtable,
9193                 .type           = NFNL_CB_BATCH,
9194                 .attr_count     = NFTA_TABLE_MAX,
9195                 .policy         = nft_table_policy,
9196         },
9197         [NFT_MSG_GETTABLE] = {
9198                 .call           = nf_tables_gettable,
9199                 .type           = NFNL_CB_RCU,
9200                 .attr_count     = NFTA_TABLE_MAX,
9201                 .policy         = nft_table_policy,
9202         },
9203         [NFT_MSG_DELTABLE] = {
9204                 .call           = nf_tables_deltable,
9205                 .type           = NFNL_CB_BATCH,
9206                 .attr_count     = NFTA_TABLE_MAX,
9207                 .policy         = nft_table_policy,
9208         },
9209         [NFT_MSG_DESTROYTABLE] = {
9210                 .call           = nf_tables_deltable,
9211                 .type           = NFNL_CB_BATCH,
9212                 .attr_count     = NFTA_TABLE_MAX,
9213                 .policy         = nft_table_policy,
9214         },
9215         [NFT_MSG_NEWCHAIN] = {
9216                 .call           = nf_tables_newchain,
9217                 .type           = NFNL_CB_BATCH,
9218                 .attr_count     = NFTA_CHAIN_MAX,
9219                 .policy         = nft_chain_policy,
9220         },
9221         [NFT_MSG_GETCHAIN] = {
9222                 .call           = nf_tables_getchain,
9223                 .type           = NFNL_CB_RCU,
9224                 .attr_count     = NFTA_CHAIN_MAX,
9225                 .policy         = nft_chain_policy,
9226         },
9227         [NFT_MSG_DELCHAIN] = {
9228                 .call           = nf_tables_delchain,
9229                 .type           = NFNL_CB_BATCH,
9230                 .attr_count     = NFTA_CHAIN_MAX,
9231                 .policy         = nft_chain_policy,
9232         },
9233         [NFT_MSG_DESTROYCHAIN] = {
9234                 .call           = nf_tables_delchain,
9235                 .type           = NFNL_CB_BATCH,
9236                 .attr_count     = NFTA_CHAIN_MAX,
9237                 .policy         = nft_chain_policy,
9238         },
9239         [NFT_MSG_NEWRULE] = {
9240                 .call           = nf_tables_newrule,
9241                 .type           = NFNL_CB_BATCH,
9242                 .attr_count     = NFTA_RULE_MAX,
9243                 .policy         = nft_rule_policy,
9244         },
9245         [NFT_MSG_GETRULE] = {
9246                 .call           = nf_tables_getrule,
9247                 .type           = NFNL_CB_RCU,
9248                 .attr_count     = NFTA_RULE_MAX,
9249                 .policy         = nft_rule_policy,
9250         },
9251         [NFT_MSG_GETRULE_RESET] = {
9252                 .call           = nf_tables_getrule_reset,
9253                 .type           = NFNL_CB_RCU,
9254                 .attr_count     = NFTA_RULE_MAX,
9255                 .policy         = nft_rule_policy,
9256         },
9257         [NFT_MSG_DELRULE] = {
9258                 .call           = nf_tables_delrule,
9259                 .type           = NFNL_CB_BATCH,
9260                 .attr_count     = NFTA_RULE_MAX,
9261                 .policy         = nft_rule_policy,
9262         },
9263         [NFT_MSG_DESTROYRULE] = {
9264                 .call           = nf_tables_delrule,
9265                 .type           = NFNL_CB_BATCH,
9266                 .attr_count     = NFTA_RULE_MAX,
9267                 .policy         = nft_rule_policy,
9268         },
9269         [NFT_MSG_NEWSET] = {
9270                 .call           = nf_tables_newset,
9271                 .type           = NFNL_CB_BATCH,
9272                 .attr_count     = NFTA_SET_MAX,
9273                 .policy         = nft_set_policy,
9274         },
9275         [NFT_MSG_GETSET] = {
9276                 .call           = nf_tables_getset,
9277                 .type           = NFNL_CB_RCU,
9278                 .attr_count     = NFTA_SET_MAX,
9279                 .policy         = nft_set_policy,
9280         },
9281         [NFT_MSG_DELSET] = {
9282                 .call           = nf_tables_delset,
9283                 .type           = NFNL_CB_BATCH,
9284                 .attr_count     = NFTA_SET_MAX,
9285                 .policy         = nft_set_policy,
9286         },
9287         [NFT_MSG_DESTROYSET] = {
9288                 .call           = nf_tables_delset,
9289                 .type           = NFNL_CB_BATCH,
9290                 .attr_count     = NFTA_SET_MAX,
9291                 .policy         = nft_set_policy,
9292         },
9293         [NFT_MSG_NEWSETELEM] = {
9294                 .call           = nf_tables_newsetelem,
9295                 .type           = NFNL_CB_BATCH,
9296                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9297                 .policy         = nft_set_elem_list_policy,
9298         },
9299         [NFT_MSG_GETSETELEM] = {
9300                 .call           = nf_tables_getsetelem,
9301                 .type           = NFNL_CB_RCU,
9302                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9303                 .policy         = nft_set_elem_list_policy,
9304         },
9305         [NFT_MSG_GETSETELEM_RESET] = {
9306                 .call           = nf_tables_getsetelem_reset,
9307                 .type           = NFNL_CB_RCU,
9308                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9309                 .policy         = nft_set_elem_list_policy,
9310         },
9311         [NFT_MSG_DELSETELEM] = {
9312                 .call           = nf_tables_delsetelem,
9313                 .type           = NFNL_CB_BATCH,
9314                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9315                 .policy         = nft_set_elem_list_policy,
9316         },
9317         [NFT_MSG_DESTROYSETELEM] = {
9318                 .call           = nf_tables_delsetelem,
9319                 .type           = NFNL_CB_BATCH,
9320                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9321                 .policy         = nft_set_elem_list_policy,
9322         },
9323         [NFT_MSG_GETGEN] = {
9324                 .call           = nf_tables_getgen,
9325                 .type           = NFNL_CB_RCU,
9326         },
9327         [NFT_MSG_NEWOBJ] = {
9328                 .call           = nf_tables_newobj,
9329                 .type           = NFNL_CB_BATCH,
9330                 .attr_count     = NFTA_OBJ_MAX,
9331                 .policy         = nft_obj_policy,
9332         },
9333         [NFT_MSG_GETOBJ] = {
9334                 .call           = nf_tables_getobj,
9335                 .type           = NFNL_CB_RCU,
9336                 .attr_count     = NFTA_OBJ_MAX,
9337                 .policy         = nft_obj_policy,
9338         },
9339         [NFT_MSG_DELOBJ] = {
9340                 .call           = nf_tables_delobj,
9341                 .type           = NFNL_CB_BATCH,
9342                 .attr_count     = NFTA_OBJ_MAX,
9343                 .policy         = nft_obj_policy,
9344         },
9345         [NFT_MSG_DESTROYOBJ] = {
9346                 .call           = nf_tables_delobj,
9347                 .type           = NFNL_CB_BATCH,
9348                 .attr_count     = NFTA_OBJ_MAX,
9349                 .policy         = nft_obj_policy,
9350         },
9351         [NFT_MSG_GETOBJ_RESET] = {
9352                 .call           = nf_tables_getobj,
9353                 .type           = NFNL_CB_RCU,
9354                 .attr_count     = NFTA_OBJ_MAX,
9355                 .policy         = nft_obj_policy,
9356         },
9357         [NFT_MSG_NEWFLOWTABLE] = {
9358                 .call           = nf_tables_newflowtable,
9359                 .type           = NFNL_CB_BATCH,
9360                 .attr_count     = NFTA_FLOWTABLE_MAX,
9361                 .policy         = nft_flowtable_policy,
9362         },
9363         [NFT_MSG_GETFLOWTABLE] = {
9364                 .call           = nf_tables_getflowtable,
9365                 .type           = NFNL_CB_RCU,
9366                 .attr_count     = NFTA_FLOWTABLE_MAX,
9367                 .policy         = nft_flowtable_policy,
9368         },
9369         [NFT_MSG_DELFLOWTABLE] = {
9370                 .call           = nf_tables_delflowtable,
9371                 .type           = NFNL_CB_BATCH,
9372                 .attr_count     = NFTA_FLOWTABLE_MAX,
9373                 .policy         = nft_flowtable_policy,
9374         },
9375         [NFT_MSG_DESTROYFLOWTABLE] = {
9376                 .call           = nf_tables_delflowtable,
9377                 .type           = NFNL_CB_BATCH,
9378                 .attr_count     = NFTA_FLOWTABLE_MAX,
9379                 .policy         = nft_flowtable_policy,
9380         },
9381 };
9382
9383 static int nf_tables_validate(struct net *net)
9384 {
9385         struct nftables_pernet *nft_net = nft_pernet(net);
9386         struct nft_table *table;
9387
9388         list_for_each_entry(table, &nft_net->tables, list) {
9389                 switch (table->validate_state) {
9390                 case NFT_VALIDATE_SKIP:
9391                         continue;
9392                 case NFT_VALIDATE_NEED:
9393                         nft_validate_state_update(table, NFT_VALIDATE_DO);
9394                         fallthrough;
9395                 case NFT_VALIDATE_DO:
9396                         if (nft_table_validate(net, table) < 0)
9397                                 return -EAGAIN;
9398
9399                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9400                         break;
9401                 }
9402         }
9403
9404         return 0;
9405 }
9406
9407 /* a drop policy has to be deferred until all rules have been activated,
9408  * otherwise a large ruleset that contains a drop-policy base chain will
9409  * cause all packets to get dropped until the full transaction has been
9410  * processed.
9411  *
9412  * We defer the drop policy until the transaction has been finalized.
9413  */
9414 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9415 {
9416         struct nft_base_chain *basechain;
9417
9418         if (nft_trans_chain_policy(trans) != NF_DROP)
9419                 return;
9420
9421         if (!nft_is_base_chain(trans->ctx.chain))
9422                 return;
9423
9424         basechain = nft_base_chain(trans->ctx.chain);
9425         basechain->policy = NF_DROP;
9426 }
9427
9428 static void nft_chain_commit_update(struct nft_trans *trans)
9429 {
9430         struct nft_base_chain *basechain;
9431
9432         if (nft_trans_chain_name(trans)) {
9433                 rhltable_remove(&trans->ctx.table->chains_ht,
9434                                 &trans->ctx.chain->rhlhead,
9435                                 nft_chain_ht_params);
9436                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9437                 rhltable_insert_key(&trans->ctx.table->chains_ht,
9438                                     trans->ctx.chain->name,
9439                                     &trans->ctx.chain->rhlhead,
9440                                     nft_chain_ht_params);
9441         }
9442
9443         if (!nft_is_base_chain(trans->ctx.chain))
9444                 return;
9445
9446         nft_chain_stats_replace(trans);
9447
9448         basechain = nft_base_chain(trans->ctx.chain);
9449
9450         switch (nft_trans_chain_policy(trans)) {
9451         case NF_DROP:
9452         case NF_ACCEPT:
9453                 basechain->policy = nft_trans_chain_policy(trans);
9454                 break;
9455         }
9456 }
9457
9458 static void nft_obj_commit_update(struct nft_trans *trans)
9459 {
9460         struct nft_object *newobj;
9461         struct nft_object *obj;
9462
9463         obj = nft_trans_obj(trans);
9464         newobj = nft_trans_obj_newobj(trans);
9465
9466         if (obj->ops->update)
9467                 obj->ops->update(obj, newobj);
9468
9469         nft_obj_destroy(&trans->ctx, newobj);
9470 }
9471
9472 static void nft_commit_release(struct nft_trans *trans)
9473 {
9474         switch (trans->msg_type) {
9475         case NFT_MSG_DELTABLE:
9476         case NFT_MSG_DESTROYTABLE:
9477                 nf_tables_table_destroy(&trans->ctx);
9478                 break;
9479         case NFT_MSG_NEWCHAIN:
9480                 free_percpu(nft_trans_chain_stats(trans));
9481                 kfree(nft_trans_chain_name(trans));
9482                 break;
9483         case NFT_MSG_DELCHAIN:
9484         case NFT_MSG_DESTROYCHAIN:
9485                 if (nft_trans_chain_update(trans))
9486                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9487                 else
9488                         nf_tables_chain_destroy(&trans->ctx);
9489                 break;
9490         case NFT_MSG_DELRULE:
9491         case NFT_MSG_DESTROYRULE:
9492                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9493                 break;
9494         case NFT_MSG_DELSET:
9495         case NFT_MSG_DESTROYSET:
9496                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9497                 break;
9498         case NFT_MSG_DELSETELEM:
9499         case NFT_MSG_DESTROYSETELEM:
9500                 nf_tables_set_elem_destroy(&trans->ctx,
9501                                            nft_trans_elem_set(trans),
9502                                            nft_trans_elem_priv(trans));
9503                 break;
9504         case NFT_MSG_DELOBJ:
9505         case NFT_MSG_DESTROYOBJ:
9506                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9507                 break;
9508         case NFT_MSG_DELFLOWTABLE:
9509         case NFT_MSG_DESTROYFLOWTABLE:
9510                 if (nft_trans_flowtable_update(trans))
9511                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9512                 else
9513                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9514                 break;
9515         }
9516
9517         if (trans->put_net)
9518                 put_net(trans->ctx.net);
9519
9520         kfree(trans);
9521 }
9522
9523 static void nf_tables_trans_destroy_work(struct work_struct *w)
9524 {
9525         struct nft_trans *trans, *next;
9526         LIST_HEAD(head);
9527
9528         spin_lock(&nf_tables_destroy_list_lock);
9529         list_splice_init(&nf_tables_destroy_list, &head);
9530         spin_unlock(&nf_tables_destroy_list_lock);
9531
9532         if (list_empty(&head))
9533                 return;
9534
9535         synchronize_rcu();
9536
9537         list_for_each_entry_safe(trans, next, &head, list) {
9538                 nft_trans_list_del(trans);
9539                 nft_commit_release(trans);
9540         }
9541 }
9542
9543 void nf_tables_trans_destroy_flush_work(void)
9544 {
9545         flush_work(&trans_destroy_work);
9546 }
9547 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9548
9549 static bool nft_expr_reduce(struct nft_regs_track *track,
9550                             const struct nft_expr *expr)
9551 {
9552         return false;
9553 }
9554
9555 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9556 {
9557         const struct nft_expr *expr, *last;
9558         struct nft_regs_track track = {};
9559         unsigned int size, data_size;
9560         void *data, *data_boundary;
9561         struct nft_rule_dp *prule;
9562         struct nft_rule *rule;
9563
9564         /* already handled or inactive chain? */
9565         if (chain->blob_next || !nft_is_active_next(net, chain))
9566                 return 0;
9567
9568         data_size = 0;
9569         list_for_each_entry(rule, &chain->rules, list) {
9570                 if (nft_is_active_next(net, rule)) {
9571                         data_size += sizeof(*prule) + rule->dlen;
9572                         if (data_size > INT_MAX)
9573                                 return -ENOMEM;
9574                 }
9575         }
9576
9577         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9578         if (!chain->blob_next)
9579                 return -ENOMEM;
9580
9581         data = (void *)chain->blob_next->data;
9582         data_boundary = data + data_size;
9583         size = 0;
9584
9585         list_for_each_entry(rule, &chain->rules, list) {
9586                 if (!nft_is_active_next(net, rule))
9587                         continue;
9588
9589                 prule = (struct nft_rule_dp *)data;
9590                 data += offsetof(struct nft_rule_dp, data);
9591                 if (WARN_ON_ONCE(data > data_boundary))
9592                         return -ENOMEM;
9593
9594                 size = 0;
9595                 track.last = nft_expr_last(rule);
9596                 nft_rule_for_each_expr(expr, last, rule) {
9597                         track.cur = expr;
9598
9599                         if (nft_expr_reduce(&track, expr)) {
9600                                 expr = track.cur;
9601                                 continue;
9602                         }
9603
9604                         if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9605                                 return -ENOMEM;
9606
9607                         memcpy(data + size, expr, expr->ops->size);
9608                         size += expr->ops->size;
9609                 }
9610                 if (WARN_ON_ONCE(size >= 1 << 12))
9611                         return -ENOMEM;
9612
9613                 prule->handle = rule->handle;
9614                 prule->dlen = size;
9615                 prule->is_last = 0;
9616
9617                 data += size;
9618                 size = 0;
9619                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9620         }
9621
9622         if (WARN_ON_ONCE(data > data_boundary))
9623                 return -ENOMEM;
9624
9625         prule = (struct nft_rule_dp *)data;
9626         nft_last_rule(chain, prule);
9627
9628         return 0;
9629 }
9630
9631 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9632 {
9633         struct nftables_pernet *nft_net = nft_pernet(net);
9634         struct nft_trans *trans, *next;
9635
9636         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9637                 struct nft_chain *chain = trans->ctx.chain;
9638
9639                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9640                     trans->msg_type == NFT_MSG_DELRULE) {
9641                         kvfree(chain->blob_next);
9642                         chain->blob_next = NULL;
9643                 }
9644         }
9645 }
9646
9647 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9648 {
9649         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9650
9651         kvfree(l->blob);
9652 }
9653
9654 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9655 {
9656         struct nft_rule_dp_last *last;
9657
9658         /* last rule trailer is after end marker */
9659         last = (void *)blob + sizeof(*blob) + blob->size;
9660         last->blob = blob;
9661
9662         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9663 }
9664
9665 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9666 {
9667         struct nft_rule_blob *g0, *g1;
9668         bool next_genbit;
9669
9670         next_genbit = nft_gencursor_next(net);
9671
9672         g0 = rcu_dereference_protected(chain->blob_gen_0,
9673                                        lockdep_commit_lock_is_held(net));
9674         g1 = rcu_dereference_protected(chain->blob_gen_1,
9675                                        lockdep_commit_lock_is_held(net));
9676
9677         /* No changes to this chain? */
9678         if (chain->blob_next == NULL) {
9679                 /* chain had no change in last or next generation */
9680                 if (g0 == g1)
9681                         return;
9682                 /*
9683                  * chain had no change in this generation; make sure next
9684                  * one uses same rules as current generation.
9685                  */
9686                 if (next_genbit) {
9687                         rcu_assign_pointer(chain->blob_gen_1, g0);
9688                         nf_tables_commit_chain_free_rules_old(g1);
9689                 } else {
9690                         rcu_assign_pointer(chain->blob_gen_0, g1);
9691                         nf_tables_commit_chain_free_rules_old(g0);
9692                 }
9693
9694                 return;
9695         }
9696
9697         if (next_genbit)
9698                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9699         else
9700                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9701
9702         chain->blob_next = NULL;
9703
9704         if (g0 == g1)
9705                 return;
9706
9707         if (next_genbit)
9708                 nf_tables_commit_chain_free_rules_old(g1);
9709         else
9710                 nf_tables_commit_chain_free_rules_old(g0);
9711 }
9712
9713 static void nft_obj_del(struct nft_object *obj)
9714 {
9715         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9716         list_del_rcu(&obj->list);
9717 }
9718
9719 void nft_chain_del(struct nft_chain *chain)
9720 {
9721         struct nft_table *table = chain->table;
9722
9723         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9724                                      nft_chain_ht_params));
9725         list_del_rcu(&chain->list);
9726 }
9727
9728 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9729                                         struct nft_trans_gc *trans)
9730 {
9731         struct nft_elem_priv **priv = trans->priv;
9732         unsigned int i;
9733
9734         for (i = 0; i < trans->count; i++) {
9735                 nft_setelem_data_deactivate(ctx->net, trans->set, priv[i]);
9736                 nft_setelem_remove(ctx->net, trans->set, priv[i]);
9737         }
9738 }
9739
9740 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9741 {
9742         nft_set_put(trans->set);
9743         put_net(trans->net);
9744         kfree(trans);
9745 }
9746
9747 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9748 {
9749         struct nft_elem_priv *elem_priv;
9750         struct nft_trans_gc *trans;
9751         struct nft_ctx ctx = {};
9752         unsigned int i;
9753
9754         trans = container_of(rcu, struct nft_trans_gc, rcu);
9755         ctx.net = read_pnet(&trans->set->net);
9756
9757         for (i = 0; i < trans->count; i++) {
9758                 elem_priv = trans->priv[i];
9759                 if (!nft_setelem_is_catchall(trans->set, elem_priv))
9760                         atomic_dec(&trans->set->nelems);
9761
9762                 nf_tables_set_elem_destroy(&ctx, trans->set, elem_priv);
9763         }
9764
9765         nft_trans_gc_destroy(trans);
9766 }
9767
9768 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9769 {
9770         struct nftables_pernet *nft_net;
9771         struct nft_ctx ctx = {};
9772
9773         nft_net = nft_pernet(trans->net);
9774
9775         mutex_lock(&nft_net->commit_mutex);
9776
9777         /* Check for race with transaction, otherwise this batch refers to
9778          * stale objects that might not be there anymore. Skip transaction if
9779          * set has been destroyed from control plane transaction in case gc
9780          * worker loses race.
9781          */
9782         if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9783                 mutex_unlock(&nft_net->commit_mutex);
9784                 return false;
9785         }
9786
9787         ctx.net = trans->net;
9788         ctx.table = trans->set->table;
9789
9790         nft_trans_gc_setelem_remove(&ctx, trans);
9791         mutex_unlock(&nft_net->commit_mutex);
9792
9793         return true;
9794 }
9795
9796 static void nft_trans_gc_work(struct work_struct *work)
9797 {
9798         struct nft_trans_gc *trans, *next;
9799         LIST_HEAD(trans_gc_list);
9800
9801         spin_lock(&nf_tables_gc_list_lock);
9802         list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9803         spin_unlock(&nf_tables_gc_list_lock);
9804
9805         list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9806                 list_del(&trans->list);
9807                 if (!nft_trans_gc_work_done(trans)) {
9808                         nft_trans_gc_destroy(trans);
9809                         continue;
9810                 }
9811                 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9812         }
9813 }
9814
9815 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9816                                         unsigned int gc_seq, gfp_t gfp)
9817 {
9818         struct net *net = read_pnet(&set->net);
9819         struct nft_trans_gc *trans;
9820
9821         trans = kzalloc(sizeof(*trans), gfp);
9822         if (!trans)
9823                 return NULL;
9824
9825         trans->net = maybe_get_net(net);
9826         if (!trans->net) {
9827                 kfree(trans);
9828                 return NULL;
9829         }
9830
9831         refcount_inc(&set->refs);
9832         trans->set = set;
9833         trans->seq = gc_seq;
9834
9835         return trans;
9836 }
9837
9838 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9839 {
9840         trans->priv[trans->count++] = priv;
9841 }
9842
9843 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9844 {
9845         spin_lock(&nf_tables_gc_list_lock);
9846         list_add_tail(&trans->list, &nf_tables_gc_list);
9847         spin_unlock(&nf_tables_gc_list_lock);
9848
9849         schedule_work(&trans_gc_work);
9850 }
9851
9852 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9853 {
9854         return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9855 }
9856
9857 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9858                                               unsigned int gc_seq, gfp_t gfp)
9859 {
9860         struct nft_set *set;
9861
9862         if (nft_trans_gc_space(gc))
9863                 return gc;
9864
9865         set = gc->set;
9866         nft_trans_gc_queue_work(gc);
9867
9868         return nft_trans_gc_alloc(set, gc_seq, gfp);
9869 }
9870
9871 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9872 {
9873         if (trans->count == 0) {
9874                 nft_trans_gc_destroy(trans);
9875                 return;
9876         }
9877
9878         nft_trans_gc_queue_work(trans);
9879 }
9880
9881 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9882 {
9883         struct nft_set *set;
9884
9885         if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9886                 return NULL;
9887
9888         if (nft_trans_gc_space(gc))
9889                 return gc;
9890
9891         set = gc->set;
9892         call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9893
9894         return nft_trans_gc_alloc(set, 0, gfp);
9895 }
9896
9897 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9898 {
9899         WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9900
9901         if (trans->count == 0) {
9902                 nft_trans_gc_destroy(trans);
9903                 return;
9904         }
9905
9906         call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9907 }
9908
9909 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9910                                                  unsigned int gc_seq)
9911 {
9912         struct nft_set_elem_catchall *catchall;
9913         const struct nft_set *set = gc->set;
9914         struct nft_set_ext *ext;
9915
9916         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9917                 ext = nft_set_elem_ext(set, catchall->elem);
9918
9919                 if (!nft_set_elem_expired(ext))
9920                         continue;
9921                 if (nft_set_elem_is_dead(ext))
9922                         goto dead_elem;
9923
9924                 nft_set_elem_dead(ext);
9925 dead_elem:
9926                 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9927                 if (!gc)
9928                         return NULL;
9929
9930                 nft_trans_gc_elem_add(gc, catchall->elem);
9931         }
9932
9933         return gc;
9934 }
9935
9936 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9937 {
9938         struct nft_set_elem_catchall *catchall, *next;
9939         u64 tstamp = nft_net_tstamp(gc->net);
9940         const struct nft_set *set = gc->set;
9941         struct nft_elem_priv *elem_priv;
9942         struct nft_set_ext *ext;
9943
9944         WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9945
9946         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9947                 ext = nft_set_elem_ext(set, catchall->elem);
9948
9949                 if (!__nft_set_elem_expired(ext, tstamp))
9950                         continue;
9951
9952                 gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9953                 if (!gc)
9954                         return NULL;
9955
9956                 elem_priv = catchall->elem;
9957                 nft_setelem_data_deactivate(gc->net, gc->set, elem_priv);
9958                 nft_setelem_catchall_destroy(catchall);
9959                 nft_trans_gc_elem_add(gc, elem_priv);
9960         }
9961
9962         return gc;
9963 }
9964
9965 static void nf_tables_module_autoload_cleanup(struct net *net)
9966 {
9967         struct nftables_pernet *nft_net = nft_pernet(net);
9968         struct nft_module_request *req, *next;
9969
9970         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9971         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9972                 WARN_ON_ONCE(!req->done);
9973                 list_del(&req->list);
9974                 kfree(req);
9975         }
9976 }
9977
9978 static void nf_tables_commit_release(struct net *net)
9979 {
9980         struct nftables_pernet *nft_net = nft_pernet(net);
9981         struct nft_trans *trans;
9982
9983         /* all side effects have to be made visible.
9984          * For example, if a chain named 'foo' has been deleted, a
9985          * new transaction must not find it anymore.
9986          *
9987          * Memory reclaim happens asynchronously from work queue
9988          * to prevent expensive synchronize_rcu() in commit phase.
9989          */
9990         if (list_empty(&nft_net->commit_list)) {
9991                 nf_tables_module_autoload_cleanup(net);
9992                 mutex_unlock(&nft_net->commit_mutex);
9993                 return;
9994         }
9995
9996         trans = list_last_entry(&nft_net->commit_list,
9997                                 struct nft_trans, list);
9998         get_net(trans->ctx.net);
9999         WARN_ON_ONCE(trans->put_net);
10000
10001         trans->put_net = true;
10002         spin_lock(&nf_tables_destroy_list_lock);
10003         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
10004         spin_unlock(&nf_tables_destroy_list_lock);
10005
10006         nf_tables_module_autoload_cleanup(net);
10007         schedule_work(&trans_destroy_work);
10008
10009         mutex_unlock(&nft_net->commit_mutex);
10010 }
10011
10012 static void nft_commit_notify(struct net *net, u32 portid)
10013 {
10014         struct nftables_pernet *nft_net = nft_pernet(net);
10015         struct sk_buff *batch_skb = NULL, *nskb, *skb;
10016         unsigned char *data;
10017         int len;
10018
10019         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
10020                 if (!batch_skb) {
10021 new_batch:
10022                         batch_skb = skb;
10023                         len = NLMSG_GOODSIZE - skb->len;
10024                         list_del(&skb->list);
10025                         continue;
10026                 }
10027                 len -= skb->len;
10028                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
10029                         data = skb_put(batch_skb, skb->len);
10030                         memcpy(data, skb->data, skb->len);
10031                         list_del(&skb->list);
10032                         kfree_skb(skb);
10033                         continue;
10034                 }
10035                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
10036                                NFT_CB(batch_skb).report, GFP_KERNEL);
10037                 goto new_batch;
10038         }
10039
10040         if (batch_skb) {
10041                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
10042                                NFT_CB(batch_skb).report, GFP_KERNEL);
10043         }
10044
10045         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10046 }
10047
10048 static int nf_tables_commit_audit_alloc(struct list_head *adl,
10049                                         struct nft_table *table)
10050 {
10051         struct nft_audit_data *adp;
10052
10053         list_for_each_entry(adp, adl, list) {
10054                 if (adp->table == table)
10055                         return 0;
10056         }
10057         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
10058         if (!adp)
10059                 return -ENOMEM;
10060         adp->table = table;
10061         list_add(&adp->list, adl);
10062         return 0;
10063 }
10064
10065 static void nf_tables_commit_audit_free(struct list_head *adl)
10066 {
10067         struct nft_audit_data *adp, *adn;
10068
10069         list_for_each_entry_safe(adp, adn, adl, list) {
10070                 list_del(&adp->list);
10071                 kfree(adp);
10072         }
10073 }
10074
10075 static void nf_tables_commit_audit_collect(struct list_head *adl,
10076                                            struct nft_table *table, u32 op)
10077 {
10078         struct nft_audit_data *adp;
10079
10080         list_for_each_entry(adp, adl, list) {
10081                 if (adp->table == table)
10082                         goto found;
10083         }
10084         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
10085         return;
10086 found:
10087         adp->entries++;
10088         if (!adp->op || adp->op > op)
10089                 adp->op = op;
10090 }
10091
10092 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
10093
10094 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
10095 {
10096         struct nft_audit_data *adp, *adn;
10097         char aubuf[AUNFTABLENAMELEN];
10098
10099         list_for_each_entry_safe(adp, adn, adl, list) {
10100                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
10101                          generation);
10102                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
10103                                 nft2audit_op[adp->op], GFP_KERNEL);
10104                 list_del(&adp->list);
10105                 kfree(adp);
10106         }
10107 }
10108
10109 static void nft_set_commit_update(struct list_head *set_update_list)
10110 {
10111         struct nft_set *set, *next;
10112
10113         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10114                 list_del_init(&set->pending_update);
10115
10116                 if (!set->ops->commit || set->dead)
10117                         continue;
10118
10119                 set->ops->commit(set);
10120         }
10121 }
10122
10123 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
10124 {
10125         unsigned int gc_seq;
10126
10127         /* Bump gc counter, it becomes odd, this is the busy mark. */
10128         gc_seq = READ_ONCE(nft_net->gc_seq);
10129         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10130
10131         return gc_seq;
10132 }
10133
10134 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
10135 {
10136         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10137 }
10138
10139 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
10140 {
10141         struct nftables_pernet *nft_net = nft_pernet(net);
10142         struct nft_trans *trans, *next;
10143         unsigned int base_seq, gc_seq;
10144         LIST_HEAD(set_update_list);
10145         struct nft_trans_elem *te;
10146         struct nft_chain *chain;
10147         struct nft_table *table;
10148         LIST_HEAD(adl);
10149         int err;
10150
10151         if (list_empty(&nft_net->commit_list)) {
10152                 mutex_unlock(&nft_net->commit_mutex);
10153                 return 0;
10154         }
10155
10156         list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
10157                 switch (trans->msg_type) {
10158                 case NFT_MSG_NEWSET:
10159                         if (!nft_trans_set_update(trans) &&
10160                             nft_set_is_anonymous(nft_trans_set(trans)) &&
10161                             !nft_trans_set_bound(trans)) {
10162                                 pr_warn_once("nftables ruleset with unbound set\n");
10163                                 return -EINVAL;
10164                         }
10165                         break;
10166                 case NFT_MSG_NEWCHAIN:
10167                         if (!nft_trans_chain_update(trans) &&
10168                             nft_chain_binding(nft_trans_chain(trans)) &&
10169                             !nft_trans_chain_bound(trans)) {
10170                                 pr_warn_once("nftables ruleset with unbound chain\n");
10171                                 return -EINVAL;
10172                         }
10173                         break;
10174                 }
10175         }
10176
10177         /* 0. Validate ruleset, otherwise roll back for error reporting. */
10178         if (nf_tables_validate(net) < 0) {
10179                 nft_net->validate_state = NFT_VALIDATE_DO;
10180                 return -EAGAIN;
10181         }
10182
10183         err = nft_flow_rule_offload_commit(net);
10184         if (err < 0)
10185                 return err;
10186
10187         /* 1.  Allocate space for next generation rules_gen_X[] */
10188         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10189                 int ret;
10190
10191                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
10192                 if (ret) {
10193                         nf_tables_commit_chain_prepare_cancel(net);
10194                         nf_tables_commit_audit_free(&adl);
10195                         return ret;
10196                 }
10197                 if (trans->msg_type == NFT_MSG_NEWRULE ||
10198                     trans->msg_type == NFT_MSG_DELRULE) {
10199                         chain = trans->ctx.chain;
10200
10201                         ret = nf_tables_commit_chain_prepare(net, chain);
10202                         if (ret < 0) {
10203                                 nf_tables_commit_chain_prepare_cancel(net);
10204                                 nf_tables_commit_audit_free(&adl);
10205                                 return ret;
10206                         }
10207                 }
10208         }
10209
10210         /* step 2.  Make rules_gen_X visible to packet path */
10211         list_for_each_entry(table, &nft_net->tables, list) {
10212                 list_for_each_entry(chain, &table->chains, list)
10213                         nf_tables_commit_chain(net, chain);
10214         }
10215
10216         /*
10217          * Bump generation counter, invalidate any dump in progress.
10218          * Cannot fail after this point.
10219          */
10220         base_seq = READ_ONCE(nft_net->base_seq);
10221         while (++base_seq == 0)
10222                 ;
10223
10224         WRITE_ONCE(nft_net->base_seq, base_seq);
10225
10226         gc_seq = nft_gc_seq_begin(nft_net);
10227
10228         /* step 3. Start new generation, rules_gen_X now in use. */
10229         net->nft.gencursor = nft_gencursor_next(net);
10230
10231         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10232                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
10233                                                trans->msg_type);
10234                 switch (trans->msg_type) {
10235                 case NFT_MSG_NEWTABLE:
10236                         if (nft_trans_table_update(trans)) {
10237                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10238                                         nft_trans_destroy(trans);
10239                                         break;
10240                                 }
10241                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
10242                                         nf_tables_table_disable(net, trans->ctx.table);
10243
10244                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10245                         } else {
10246                                 nft_clear(net, trans->ctx.table);
10247                         }
10248                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10249                         nft_trans_destroy(trans);
10250                         break;
10251                 case NFT_MSG_DELTABLE:
10252                 case NFT_MSG_DESTROYTABLE:
10253                         list_del_rcu(&trans->ctx.table->list);
10254                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
10255                         break;
10256                 case NFT_MSG_NEWCHAIN:
10257                         if (nft_trans_chain_update(trans)) {
10258                                 nft_chain_commit_update(trans);
10259                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10260                                                        &nft_trans_chain_hooks(trans));
10261                                 list_splice(&nft_trans_chain_hooks(trans),
10262                                             &nft_trans_basechain(trans)->hook_list);
10263                                 /* trans destroyed after rcu grace period */
10264                         } else {
10265                                 nft_chain_commit_drop_policy(trans);
10266                                 nft_clear(net, trans->ctx.chain);
10267                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10268                                 nft_trans_destroy(trans);
10269                         }
10270                         break;
10271                 case NFT_MSG_DELCHAIN:
10272                 case NFT_MSG_DESTROYCHAIN:
10273                         if (nft_trans_chain_update(trans)) {
10274                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10275                                                        &nft_trans_chain_hooks(trans));
10276                                 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT)) {
10277                                         nft_netdev_unregister_hooks(net,
10278                                                                     &nft_trans_chain_hooks(trans),
10279                                                                     true);
10280                                 }
10281                         } else {
10282                                 nft_chain_del(trans->ctx.chain);
10283                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10284                                                        NULL);
10285                                 nf_tables_unregister_hook(trans->ctx.net,
10286                                                           trans->ctx.table,
10287                                                           trans->ctx.chain);
10288                         }
10289                         break;
10290                 case NFT_MSG_NEWRULE:
10291                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10292                         nf_tables_rule_notify(&trans->ctx,
10293                                               nft_trans_rule(trans),
10294                                               NFT_MSG_NEWRULE);
10295                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10296                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10297
10298                         nft_trans_destroy(trans);
10299                         break;
10300                 case NFT_MSG_DELRULE:
10301                 case NFT_MSG_DESTROYRULE:
10302                         list_del_rcu(&nft_trans_rule(trans)->list);
10303                         nf_tables_rule_notify(&trans->ctx,
10304                                               nft_trans_rule(trans),
10305                                               trans->msg_type);
10306                         nft_rule_expr_deactivate(&trans->ctx,
10307                                                  nft_trans_rule(trans),
10308                                                  NFT_TRANS_COMMIT);
10309
10310                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10311                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10312                         break;
10313                 case NFT_MSG_NEWSET:
10314                         if (nft_trans_set_update(trans)) {
10315                                 struct nft_set *set = nft_trans_set(trans);
10316
10317                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10318                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10319
10320                                 if (nft_trans_set_size(trans))
10321                                         WRITE_ONCE(set->size, nft_trans_set_size(trans));
10322                         } else {
10323                                 nft_clear(net, nft_trans_set(trans));
10324                                 /* This avoids hitting -EBUSY when deleting the table
10325                                  * from the transaction.
10326                                  */
10327                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10328                                     !list_empty(&nft_trans_set(trans)->bindings))
10329                                         nft_use_dec(&trans->ctx.table->use);
10330                         }
10331                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10332                                              NFT_MSG_NEWSET, GFP_KERNEL);
10333                         nft_trans_destroy(trans);
10334                         break;
10335                 case NFT_MSG_DELSET:
10336                 case NFT_MSG_DESTROYSET:
10337                         nft_trans_set(trans)->dead = 1;
10338                         list_del_rcu(&nft_trans_set(trans)->list);
10339                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10340                                              trans->msg_type, GFP_KERNEL);
10341                         break;
10342                 case NFT_MSG_NEWSETELEM:
10343                         te = (struct nft_trans_elem *)trans->data;
10344
10345                         nft_setelem_activate(net, te->set, te->elem_priv);
10346                         nf_tables_setelem_notify(&trans->ctx, te->set,
10347                                                  te->elem_priv,
10348                                                  NFT_MSG_NEWSETELEM);
10349                         if (te->set->ops->commit &&
10350                             list_empty(&te->set->pending_update)) {
10351                                 list_add_tail(&te->set->pending_update,
10352                                               &set_update_list);
10353                         }
10354                         nft_trans_destroy(trans);
10355                         break;
10356                 case NFT_MSG_DELSETELEM:
10357                 case NFT_MSG_DESTROYSETELEM:
10358                         te = (struct nft_trans_elem *)trans->data;
10359
10360                         nf_tables_setelem_notify(&trans->ctx, te->set,
10361                                                  te->elem_priv,
10362                                                  trans->msg_type);
10363                         nft_setelem_remove(net, te->set, te->elem_priv);
10364                         if (!nft_setelem_is_catchall(te->set, te->elem_priv)) {
10365                                 atomic_dec(&te->set->nelems);
10366                                 te->set->ndeact--;
10367                         }
10368                         if (te->set->ops->commit &&
10369                             list_empty(&te->set->pending_update)) {
10370                                 list_add_tail(&te->set->pending_update,
10371                                               &set_update_list);
10372                         }
10373                         break;
10374                 case NFT_MSG_NEWOBJ:
10375                         if (nft_trans_obj_update(trans)) {
10376                                 nft_obj_commit_update(trans);
10377                                 nf_tables_obj_notify(&trans->ctx,
10378                                                      nft_trans_obj(trans),
10379                                                      NFT_MSG_NEWOBJ);
10380                         } else {
10381                                 nft_clear(net, nft_trans_obj(trans));
10382                                 nf_tables_obj_notify(&trans->ctx,
10383                                                      nft_trans_obj(trans),
10384                                                      NFT_MSG_NEWOBJ);
10385                                 nft_trans_destroy(trans);
10386                         }
10387                         break;
10388                 case NFT_MSG_DELOBJ:
10389                 case NFT_MSG_DESTROYOBJ:
10390                         nft_obj_del(nft_trans_obj(trans));
10391                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10392                                              trans->msg_type);
10393                         break;
10394                 case NFT_MSG_NEWFLOWTABLE:
10395                         if (nft_trans_flowtable_update(trans)) {
10396                                 nft_trans_flowtable(trans)->data.flags =
10397                                         nft_trans_flowtable_flags(trans);
10398                                 nf_tables_flowtable_notify(&trans->ctx,
10399                                                            nft_trans_flowtable(trans),
10400                                                            &nft_trans_flowtable_hooks(trans),
10401                                                            NFT_MSG_NEWFLOWTABLE);
10402                                 list_splice(&nft_trans_flowtable_hooks(trans),
10403                                             &nft_trans_flowtable(trans)->hook_list);
10404                         } else {
10405                                 nft_clear(net, nft_trans_flowtable(trans));
10406                                 nf_tables_flowtable_notify(&trans->ctx,
10407                                                            nft_trans_flowtable(trans),
10408                                                            NULL,
10409                                                            NFT_MSG_NEWFLOWTABLE);
10410                         }
10411                         nft_trans_destroy(trans);
10412                         break;
10413                 case NFT_MSG_DELFLOWTABLE:
10414                 case NFT_MSG_DESTROYFLOWTABLE:
10415                         if (nft_trans_flowtable_update(trans)) {
10416                                 nf_tables_flowtable_notify(&trans->ctx,
10417                                                            nft_trans_flowtable(trans),
10418                                                            &nft_trans_flowtable_hooks(trans),
10419                                                            trans->msg_type);
10420                                 nft_unregister_flowtable_net_hooks(net,
10421                                                                    &nft_trans_flowtable_hooks(trans));
10422                         } else {
10423                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10424                                 nf_tables_flowtable_notify(&trans->ctx,
10425                                                            nft_trans_flowtable(trans),
10426                                                            NULL,
10427                                                            trans->msg_type);
10428                                 nft_unregister_flowtable_net_hooks(net,
10429                                                 &nft_trans_flowtable(trans)->hook_list);
10430                         }
10431                         break;
10432                 }
10433         }
10434
10435         nft_set_commit_update(&set_update_list);
10436
10437         nft_commit_notify(net, NETLINK_CB(skb).portid);
10438         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10439         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10440
10441         nft_gc_seq_end(nft_net, gc_seq);
10442         nft_net->validate_state = NFT_VALIDATE_SKIP;
10443         nf_tables_commit_release(net);
10444
10445         return 0;
10446 }
10447
10448 static void nf_tables_module_autoload(struct net *net)
10449 {
10450         struct nftables_pernet *nft_net = nft_pernet(net);
10451         struct nft_module_request *req, *next;
10452         LIST_HEAD(module_list);
10453
10454         list_splice_init(&nft_net->module_list, &module_list);
10455         mutex_unlock(&nft_net->commit_mutex);
10456         list_for_each_entry_safe(req, next, &module_list, list) {
10457                 request_module("%s", req->module);
10458                 req->done = true;
10459         }
10460         mutex_lock(&nft_net->commit_mutex);
10461         list_splice(&module_list, &nft_net->module_list);
10462 }
10463
10464 static void nf_tables_abort_release(struct nft_trans *trans)
10465 {
10466         switch (trans->msg_type) {
10467         case NFT_MSG_NEWTABLE:
10468                 nf_tables_table_destroy(&trans->ctx);
10469                 break;
10470         case NFT_MSG_NEWCHAIN:
10471                 if (nft_trans_chain_update(trans))
10472                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10473                 else
10474                         nf_tables_chain_destroy(&trans->ctx);
10475                 break;
10476         case NFT_MSG_NEWRULE:
10477                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10478                 break;
10479         case NFT_MSG_NEWSET:
10480                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10481                 break;
10482         case NFT_MSG_NEWSETELEM:
10483                 nft_set_elem_destroy(nft_trans_elem_set(trans),
10484                                      nft_trans_elem_priv(trans), true);
10485                 break;
10486         case NFT_MSG_NEWOBJ:
10487                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10488                 break;
10489         case NFT_MSG_NEWFLOWTABLE:
10490                 if (nft_trans_flowtable_update(trans))
10491                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10492                 else
10493                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10494                 break;
10495         }
10496         kfree(trans);
10497 }
10498
10499 static void nft_set_abort_update(struct list_head *set_update_list)
10500 {
10501         struct nft_set *set, *next;
10502
10503         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10504                 list_del_init(&set->pending_update);
10505
10506                 if (!set->ops->abort)
10507                         continue;
10508
10509                 set->ops->abort(set);
10510         }
10511 }
10512
10513 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10514 {
10515         struct nftables_pernet *nft_net = nft_pernet(net);
10516         struct nft_trans *trans, *next;
10517         LIST_HEAD(set_update_list);
10518         struct nft_trans_elem *te;
10519         int err = 0;
10520
10521         if (action == NFNL_ABORT_VALIDATE &&
10522             nf_tables_validate(net) < 0)
10523                 err = -EAGAIN;
10524
10525         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10526                                          list) {
10527                 switch (trans->msg_type) {
10528                 case NFT_MSG_NEWTABLE:
10529                         if (nft_trans_table_update(trans)) {
10530                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10531                                         nft_trans_destroy(trans);
10532                                         break;
10533                                 }
10534                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10535                                         nf_tables_table_disable(net, trans->ctx.table);
10536                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10537                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10538                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10539                                 }
10540                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10541                                 nft_trans_destroy(trans);
10542                         } else {
10543                                 list_del_rcu(&trans->ctx.table->list);
10544                         }
10545                         break;
10546                 case NFT_MSG_DELTABLE:
10547                 case NFT_MSG_DESTROYTABLE:
10548                         nft_clear(trans->ctx.net, trans->ctx.table);
10549                         nft_trans_destroy(trans);
10550                         break;
10551                 case NFT_MSG_NEWCHAIN:
10552                         if (nft_trans_chain_update(trans)) {
10553                                 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT)) {
10554                                         nft_netdev_unregister_hooks(net,
10555                                                                     &nft_trans_chain_hooks(trans),
10556                                                                     true);
10557                                 }
10558                                 free_percpu(nft_trans_chain_stats(trans));
10559                                 kfree(nft_trans_chain_name(trans));
10560                                 nft_trans_destroy(trans);
10561                         } else {
10562                                 if (nft_trans_chain_bound(trans)) {
10563                                         nft_trans_destroy(trans);
10564                                         break;
10565                                 }
10566                                 nft_use_dec_restore(&trans->ctx.table->use);
10567                                 nft_chain_del(trans->ctx.chain);
10568                                 nf_tables_unregister_hook(trans->ctx.net,
10569                                                           trans->ctx.table,
10570                                                           trans->ctx.chain);
10571                         }
10572                         break;
10573                 case NFT_MSG_DELCHAIN:
10574                 case NFT_MSG_DESTROYCHAIN:
10575                         if (nft_trans_chain_update(trans)) {
10576                                 list_splice(&nft_trans_chain_hooks(trans),
10577                                             &nft_trans_basechain(trans)->hook_list);
10578                         } else {
10579                                 nft_use_inc_restore(&trans->ctx.table->use);
10580                                 nft_clear(trans->ctx.net, trans->ctx.chain);
10581                         }
10582                         nft_trans_destroy(trans);
10583                         break;
10584                 case NFT_MSG_NEWRULE:
10585                         if (nft_trans_rule_bound(trans)) {
10586                                 nft_trans_destroy(trans);
10587                                 break;
10588                         }
10589                         nft_use_dec_restore(&trans->ctx.chain->use);
10590                         list_del_rcu(&nft_trans_rule(trans)->list);
10591                         nft_rule_expr_deactivate(&trans->ctx,
10592                                                  nft_trans_rule(trans),
10593                                                  NFT_TRANS_ABORT);
10594                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10595                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10596                         break;
10597                 case NFT_MSG_DELRULE:
10598                 case NFT_MSG_DESTROYRULE:
10599                         nft_use_inc_restore(&trans->ctx.chain->use);
10600                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10601                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10602                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10603                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10604
10605                         nft_trans_destroy(trans);
10606                         break;
10607                 case NFT_MSG_NEWSET:
10608                         if (nft_trans_set_update(trans)) {
10609                                 nft_trans_destroy(trans);
10610                                 break;
10611                         }
10612                         nft_use_dec_restore(&trans->ctx.table->use);
10613                         if (nft_trans_set_bound(trans)) {
10614                                 nft_trans_destroy(trans);
10615                                 break;
10616                         }
10617                         nft_trans_set(trans)->dead = 1;
10618                         list_del_rcu(&nft_trans_set(trans)->list);
10619                         break;
10620                 case NFT_MSG_DELSET:
10621                 case NFT_MSG_DESTROYSET:
10622                         nft_use_inc_restore(&trans->ctx.table->use);
10623                         nft_clear(trans->ctx.net, nft_trans_set(trans));
10624                         if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10625                                 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10626
10627                         nft_trans_destroy(trans);
10628                         break;
10629                 case NFT_MSG_NEWSETELEM:
10630                         if (nft_trans_elem_set_bound(trans)) {
10631                                 nft_trans_destroy(trans);
10632                                 break;
10633                         }
10634                         te = (struct nft_trans_elem *)trans->data;
10635                         nft_setelem_remove(net, te->set, te->elem_priv);
10636                         if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10637                                 atomic_dec(&te->set->nelems);
10638
10639                         if (te->set->ops->abort &&
10640                             list_empty(&te->set->pending_update)) {
10641                                 list_add_tail(&te->set->pending_update,
10642                                               &set_update_list);
10643                         }
10644                         break;
10645                 case NFT_MSG_DELSETELEM:
10646                 case NFT_MSG_DESTROYSETELEM:
10647                         te = (struct nft_trans_elem *)trans->data;
10648
10649                         if (!nft_setelem_active_next(net, te->set, te->elem_priv)) {
10650                                 nft_setelem_data_activate(net, te->set, te->elem_priv);
10651                                 nft_setelem_activate(net, te->set, te->elem_priv);
10652                         }
10653                         if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10654                                 te->set->ndeact--;
10655
10656                         if (te->set->ops->abort &&
10657                             list_empty(&te->set->pending_update)) {
10658                                 list_add_tail(&te->set->pending_update,
10659                                               &set_update_list);
10660                         }
10661                         nft_trans_destroy(trans);
10662                         break;
10663                 case NFT_MSG_NEWOBJ:
10664                         if (nft_trans_obj_update(trans)) {
10665                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10666                                 nft_trans_destroy(trans);
10667                         } else {
10668                                 nft_use_dec_restore(&trans->ctx.table->use);
10669                                 nft_obj_del(nft_trans_obj(trans));
10670                         }
10671                         break;
10672                 case NFT_MSG_DELOBJ:
10673                 case NFT_MSG_DESTROYOBJ:
10674                         nft_use_inc_restore(&trans->ctx.table->use);
10675                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
10676                         nft_trans_destroy(trans);
10677                         break;
10678                 case NFT_MSG_NEWFLOWTABLE:
10679                         if (nft_trans_flowtable_update(trans)) {
10680                                 nft_unregister_flowtable_net_hooks(net,
10681                                                 &nft_trans_flowtable_hooks(trans));
10682                         } else {
10683                                 nft_use_dec_restore(&trans->ctx.table->use);
10684                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10685                                 nft_unregister_flowtable_net_hooks(net,
10686                                                 &nft_trans_flowtable(trans)->hook_list);
10687                         }
10688                         break;
10689                 case NFT_MSG_DELFLOWTABLE:
10690                 case NFT_MSG_DESTROYFLOWTABLE:
10691                         if (nft_trans_flowtable_update(trans)) {
10692                                 list_splice(&nft_trans_flowtable_hooks(trans),
10693                                             &nft_trans_flowtable(trans)->hook_list);
10694                         } else {
10695                                 nft_use_inc_restore(&trans->ctx.table->use);
10696                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10697                         }
10698                         nft_trans_destroy(trans);
10699                         break;
10700                 }
10701         }
10702
10703         nft_set_abort_update(&set_update_list);
10704
10705         synchronize_rcu();
10706
10707         list_for_each_entry_safe_reverse(trans, next,
10708                                          &nft_net->commit_list, list) {
10709                 nft_trans_list_del(trans);
10710                 nf_tables_abort_release(trans);
10711         }
10712
10713         return err;
10714 }
10715
10716 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10717                            enum nfnl_abort_action action)
10718 {
10719         struct nftables_pernet *nft_net = nft_pernet(net);
10720         unsigned int gc_seq;
10721         int ret;
10722
10723         gc_seq = nft_gc_seq_begin(nft_net);
10724         ret = __nf_tables_abort(net, action);
10725         nft_gc_seq_end(nft_net, gc_seq);
10726
10727         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
10728
10729         /* module autoload needs to happen after GC sequence update because it
10730          * temporarily releases and grabs mutex again.
10731          */
10732         if (action == NFNL_ABORT_AUTOLOAD)
10733                 nf_tables_module_autoload(net);
10734         else
10735                 nf_tables_module_autoload_cleanup(net);
10736
10737         mutex_unlock(&nft_net->commit_mutex);
10738
10739         return ret;
10740 }
10741
10742 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10743 {
10744         struct nftables_pernet *nft_net = nft_pernet(net);
10745         bool genid_ok;
10746
10747         mutex_lock(&nft_net->commit_mutex);
10748         nft_net->tstamp = get_jiffies_64();
10749
10750         genid_ok = genid == 0 || nft_net->base_seq == genid;
10751         if (!genid_ok)
10752                 mutex_unlock(&nft_net->commit_mutex);
10753
10754         /* else, commit mutex has to be released by commit or abort function */
10755         return genid_ok;
10756 }
10757
10758 static const struct nfnetlink_subsystem nf_tables_subsys = {
10759         .name           = "nf_tables",
10760         .subsys_id      = NFNL_SUBSYS_NFTABLES,
10761         .cb_count       = NFT_MSG_MAX,
10762         .cb             = nf_tables_cb,
10763         .commit         = nf_tables_commit,
10764         .abort          = nf_tables_abort,
10765         .valid_genid    = nf_tables_valid_genid,
10766         .owner          = THIS_MODULE,
10767 };
10768
10769 int nft_chain_validate_dependency(const struct nft_chain *chain,
10770                                   enum nft_chain_types type)
10771 {
10772         const struct nft_base_chain *basechain;
10773
10774         if (nft_is_base_chain(chain)) {
10775                 basechain = nft_base_chain(chain);
10776                 if (basechain->type->type != type)
10777                         return -EOPNOTSUPP;
10778         }
10779         return 0;
10780 }
10781 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10782
10783 int nft_chain_validate_hooks(const struct nft_chain *chain,
10784                              unsigned int hook_flags)
10785 {
10786         struct nft_base_chain *basechain;
10787
10788         if (nft_is_base_chain(chain)) {
10789                 basechain = nft_base_chain(chain);
10790
10791                 if ((1 << basechain->ops.hooknum) & hook_flags)
10792                         return 0;
10793
10794                 return -EOPNOTSUPP;
10795         }
10796
10797         return 0;
10798 }
10799 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10800
10801 /*
10802  * Loop detection - walk through the ruleset beginning at the destination chain
10803  * of a new jump until either the source chain is reached (loop) or all
10804  * reachable chains have been traversed.
10805  *
10806  * The loop check is performed whenever a new jump verdict is added to an
10807  * expression or verdict map or a verdict map is bound to a new chain.
10808  */
10809
10810 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10811                                  const struct nft_chain *chain);
10812
10813 static int nft_check_loops(const struct nft_ctx *ctx,
10814                            const struct nft_set_ext *ext)
10815 {
10816         const struct nft_data *data;
10817         int ret;
10818
10819         data = nft_set_ext_data(ext);
10820         switch (data->verdict.code) {
10821         case NFT_JUMP:
10822         case NFT_GOTO:
10823                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10824                 break;
10825         default:
10826                 ret = 0;
10827                 break;
10828         }
10829
10830         return ret;
10831 }
10832
10833 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10834                                         struct nft_set *set,
10835                                         const struct nft_set_iter *iter,
10836                                         struct nft_elem_priv *elem_priv)
10837 {
10838         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
10839
10840         if (!nft_set_elem_active(ext, iter->genmask))
10841                 return 0;
10842
10843         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10844             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10845                 return 0;
10846
10847         return nft_check_loops(ctx, ext);
10848 }
10849
10850 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10851                                   struct nft_set *set)
10852 {
10853         u8 genmask = nft_genmask_next(ctx->net);
10854         struct nft_set_elem_catchall *catchall;
10855         struct nft_set_ext *ext;
10856         int ret = 0;
10857
10858         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10859                 ext = nft_set_elem_ext(set, catchall->elem);
10860                 if (!nft_set_elem_active(ext, genmask))
10861                         continue;
10862
10863                 ret = nft_check_loops(ctx, ext);
10864                 if (ret < 0)
10865                         return ret;
10866         }
10867
10868         return ret;
10869 }
10870
10871 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10872                                  const struct nft_chain *chain)
10873 {
10874         const struct nft_rule *rule;
10875         const struct nft_expr *expr, *last;
10876         struct nft_set *set;
10877         struct nft_set_binding *binding;
10878         struct nft_set_iter iter;
10879
10880         if (ctx->chain == chain)
10881                 return -ELOOP;
10882
10883         if (fatal_signal_pending(current))
10884                 return -EINTR;
10885
10886         list_for_each_entry(rule, &chain->rules, list) {
10887                 nft_rule_for_each_expr(expr, last, rule) {
10888                         struct nft_immediate_expr *priv;
10889                         const struct nft_data *data;
10890                         int err;
10891
10892                         if (strcmp(expr->ops->type->name, "immediate"))
10893                                 continue;
10894
10895                         priv = nft_expr_priv(expr);
10896                         if (priv->dreg != NFT_REG_VERDICT)
10897                                 continue;
10898
10899                         data = &priv->data;
10900                         switch (data->verdict.code) {
10901                         case NFT_JUMP:
10902                         case NFT_GOTO:
10903                                 err = nf_tables_check_loops(ctx,
10904                                                         data->verdict.chain);
10905                                 if (err < 0)
10906                                         return err;
10907                                 break;
10908                         default:
10909                                 break;
10910                         }
10911                 }
10912         }
10913
10914         list_for_each_entry(set, &ctx->table->sets, list) {
10915                 if (!nft_is_active_next(ctx->net, set))
10916                         continue;
10917                 if (!(set->flags & NFT_SET_MAP) ||
10918                     set->dtype != NFT_DATA_VERDICT)
10919                         continue;
10920
10921                 list_for_each_entry(binding, &set->bindings, list) {
10922                         if (!(binding->flags & NFT_SET_MAP) ||
10923                             binding->chain != chain)
10924                                 continue;
10925
10926                         iter.genmask    = nft_genmask_next(ctx->net);
10927                         iter.type       = NFT_ITER_UPDATE;
10928                         iter.skip       = 0;
10929                         iter.count      = 0;
10930                         iter.err        = 0;
10931                         iter.fn         = nf_tables_loop_check_setelem;
10932
10933                         set->ops->walk(ctx, set, &iter);
10934                         if (!iter.err)
10935                                 iter.err = nft_set_catchall_loops(ctx, set);
10936
10937                         if (iter.err < 0)
10938                                 return iter.err;
10939                 }
10940         }
10941
10942         return 0;
10943 }
10944
10945 /**
10946  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
10947  *
10948  *      @attr: netlink attribute to fetch value from
10949  *      @max: maximum value to be stored in dest
10950  *      @dest: pointer to the variable
10951  *
10952  *      Parse, check and store a given u32 netlink attribute into variable.
10953  *      This function returns -ERANGE if the value goes over maximum value.
10954  *      Otherwise a 0 is returned and the attribute value is stored in the
10955  *      destination variable.
10956  */
10957 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10958 {
10959         u32 val;
10960
10961         val = ntohl(nla_get_be32(attr));
10962         if (val > max)
10963                 return -ERANGE;
10964
10965         *dest = val;
10966         return 0;
10967 }
10968 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10969
10970 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10971 {
10972         unsigned int reg;
10973
10974         reg = ntohl(nla_get_be32(attr));
10975         switch (reg) {
10976         case NFT_REG_VERDICT...NFT_REG_4:
10977                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10978                 break;
10979         case NFT_REG32_00...NFT_REG32_15:
10980                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10981                 break;
10982         default:
10983                 return -ERANGE;
10984         }
10985
10986         return 0;
10987 }
10988
10989 /**
10990  *      nft_dump_register - dump a register value to a netlink attribute
10991  *
10992  *      @skb: socket buffer
10993  *      @attr: attribute number
10994  *      @reg: register number
10995  *
10996  *      Construct a netlink attribute containing the register number. For
10997  *      compatibility reasons, register numbers being a multiple of 4 are
10998  *      translated to the corresponding 128 bit register numbers.
10999  */
11000 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
11001 {
11002         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
11003                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
11004         else
11005                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
11006
11007         return nla_put_be32(skb, attr, htonl(reg));
11008 }
11009 EXPORT_SYMBOL_GPL(nft_dump_register);
11010
11011 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
11012 {
11013         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
11014                 return -EINVAL;
11015         if (len == 0)
11016                 return -EINVAL;
11017         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
11018                 return -ERANGE;
11019
11020         return 0;
11021 }
11022
11023 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
11024 {
11025         u32 reg;
11026         int err;
11027
11028         err = nft_parse_register(attr, &reg);
11029         if (err < 0)
11030                 return err;
11031
11032         err = nft_validate_register_load(reg, len);
11033         if (err < 0)
11034                 return err;
11035
11036         *sreg = reg;
11037         return 0;
11038 }
11039 EXPORT_SYMBOL_GPL(nft_parse_register_load);
11040
11041 static int nft_validate_register_store(const struct nft_ctx *ctx,
11042                                        enum nft_registers reg,
11043                                        const struct nft_data *data,
11044                                        enum nft_data_types type,
11045                                        unsigned int len)
11046 {
11047         int err;
11048
11049         switch (reg) {
11050         case NFT_REG_VERDICT:
11051                 if (type != NFT_DATA_VERDICT)
11052                         return -EINVAL;
11053
11054                 if (data != NULL &&
11055                     (data->verdict.code == NFT_GOTO ||
11056                      data->verdict.code == NFT_JUMP)) {
11057                         err = nf_tables_check_loops(ctx, data->verdict.chain);
11058                         if (err < 0)
11059                                 return err;
11060                 }
11061
11062                 return 0;
11063         default:
11064                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
11065                         return -EINVAL;
11066                 if (len == 0)
11067                         return -EINVAL;
11068                 if (reg * NFT_REG32_SIZE + len >
11069                     sizeof_field(struct nft_regs, data))
11070                         return -ERANGE;
11071
11072                 if (data != NULL && type != NFT_DATA_VALUE)
11073                         return -EINVAL;
11074                 return 0;
11075         }
11076 }
11077
11078 int nft_parse_register_store(const struct nft_ctx *ctx,
11079                              const struct nlattr *attr, u8 *dreg,
11080                              const struct nft_data *data,
11081                              enum nft_data_types type, unsigned int len)
11082 {
11083         int err;
11084         u32 reg;
11085
11086         err = nft_parse_register(attr, &reg);
11087         if (err < 0)
11088                 return err;
11089
11090         err = nft_validate_register_store(ctx, reg, data, type, len);
11091         if (err < 0)
11092                 return err;
11093
11094         *dreg = reg;
11095         return 0;
11096 }
11097 EXPORT_SYMBOL_GPL(nft_parse_register_store);
11098
11099 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
11100         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
11101         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
11102                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
11103         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
11104 };
11105
11106 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
11107                             struct nft_data_desc *desc, const struct nlattr *nla)
11108 {
11109         u8 genmask = nft_genmask_next(ctx->net);
11110         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
11111         struct nft_chain *chain;
11112         int err;
11113
11114         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
11115                                           nft_verdict_policy, NULL);
11116         if (err < 0)
11117                 return err;
11118
11119         if (!tb[NFTA_VERDICT_CODE])
11120                 return -EINVAL;
11121
11122         /* zero padding hole for memcmp */
11123         memset(data, 0, sizeof(*data));
11124         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
11125
11126         switch (data->verdict.code) {
11127         case NF_ACCEPT:
11128         case NF_DROP:
11129         case NF_QUEUE:
11130                 break;
11131         case NFT_CONTINUE:
11132         case NFT_BREAK:
11133         case NFT_RETURN:
11134                 break;
11135         case NFT_JUMP:
11136         case NFT_GOTO:
11137                 if (tb[NFTA_VERDICT_CHAIN]) {
11138                         chain = nft_chain_lookup(ctx->net, ctx->table,
11139                                                  tb[NFTA_VERDICT_CHAIN],
11140                                                  genmask);
11141                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
11142                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
11143                                                       tb[NFTA_VERDICT_CHAIN_ID],
11144                                                       genmask);
11145                         if (IS_ERR(chain))
11146                                 return PTR_ERR(chain);
11147                 } else {
11148                         return -EINVAL;
11149                 }
11150
11151                 if (IS_ERR(chain))
11152                         return PTR_ERR(chain);
11153                 if (nft_is_base_chain(chain))
11154                         return -EOPNOTSUPP;
11155                 if (nft_chain_is_bound(chain))
11156                         return -EINVAL;
11157                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
11158                     chain->flags & NFT_CHAIN_BINDING)
11159                         return -EINVAL;
11160                 if (!nft_use_inc(&chain->use))
11161                         return -EMFILE;
11162
11163                 data->verdict.chain = chain;
11164                 break;
11165         default:
11166                 return -EINVAL;
11167         }
11168
11169         desc->len = sizeof(data->verdict);
11170
11171         return 0;
11172 }
11173
11174 static void nft_verdict_uninit(const struct nft_data *data)
11175 {
11176         struct nft_chain *chain;
11177
11178         switch (data->verdict.code) {
11179         case NFT_JUMP:
11180         case NFT_GOTO:
11181                 chain = data->verdict.chain;
11182                 nft_use_dec(&chain->use);
11183                 break;
11184         }
11185 }
11186
11187 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
11188 {
11189         struct nlattr *nest;
11190
11191         nest = nla_nest_start_noflag(skb, type);
11192         if (!nest)
11193                 goto nla_put_failure;
11194
11195         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
11196                 goto nla_put_failure;
11197
11198         switch (v->code) {
11199         case NFT_JUMP:
11200         case NFT_GOTO:
11201                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
11202                                    v->chain->name))
11203                         goto nla_put_failure;
11204         }
11205         nla_nest_end(skb, nest);
11206         return 0;
11207
11208 nla_put_failure:
11209         return -1;
11210 }
11211
11212 static int nft_value_init(const struct nft_ctx *ctx,
11213                           struct nft_data *data, struct nft_data_desc *desc,
11214                           const struct nlattr *nla)
11215 {
11216         unsigned int len;
11217
11218         len = nla_len(nla);
11219         if (len == 0)
11220                 return -EINVAL;
11221         if (len > desc->size)
11222                 return -EOVERFLOW;
11223         if (desc->len) {
11224                 if (len != desc->len)
11225                         return -EINVAL;
11226         } else {
11227                 desc->len = len;
11228         }
11229
11230         nla_memcpy(data->data, nla, len);
11231
11232         return 0;
11233 }
11234
11235 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
11236                           unsigned int len)
11237 {
11238         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
11239 }
11240
11241 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
11242         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
11243         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
11244 };
11245
11246 /**
11247  *      nft_data_init - parse nf_tables data netlink attributes
11248  *
11249  *      @ctx: context of the expression using the data
11250  *      @data: destination struct nft_data
11251  *      @desc: data description
11252  *      @nla: netlink attribute containing data
11253  *
11254  *      Parse the netlink data attributes and initialize a struct nft_data.
11255  *      The type and length of data are returned in the data description.
11256  *
11257  *      The caller can indicate that it only wants to accept data of type
11258  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
11259  */
11260 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11261                   struct nft_data_desc *desc, const struct nlattr *nla)
11262 {
11263         struct nlattr *tb[NFTA_DATA_MAX + 1];
11264         int err;
11265
11266         if (WARN_ON_ONCE(!desc->size))
11267                 return -EINVAL;
11268
11269         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11270                                           nft_data_policy, NULL);
11271         if (err < 0)
11272                 return err;
11273
11274         if (tb[NFTA_DATA_VALUE]) {
11275                 if (desc->type != NFT_DATA_VALUE)
11276                         return -EINVAL;
11277
11278                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11279         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11280                 if (desc->type != NFT_DATA_VERDICT)
11281                         return -EINVAL;
11282
11283                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11284         } else {
11285                 err = -EINVAL;
11286         }
11287
11288         return err;
11289 }
11290 EXPORT_SYMBOL_GPL(nft_data_init);
11291
11292 /**
11293  *      nft_data_release - release a nft_data item
11294  *
11295  *      @data: struct nft_data to release
11296  *      @type: type of data
11297  *
11298  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11299  *      all others need to be released by calling this function.
11300  */
11301 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11302 {
11303         if (type < NFT_DATA_VERDICT)
11304                 return;
11305         switch (type) {
11306         case NFT_DATA_VERDICT:
11307                 return nft_verdict_uninit(data);
11308         default:
11309                 WARN_ON(1);
11310         }
11311 }
11312 EXPORT_SYMBOL_GPL(nft_data_release);
11313
11314 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11315                   enum nft_data_types type, unsigned int len)
11316 {
11317         struct nlattr *nest;
11318         int err;
11319
11320         nest = nla_nest_start_noflag(skb, attr);
11321         if (nest == NULL)
11322                 return -1;
11323
11324         switch (type) {
11325         case NFT_DATA_VALUE:
11326                 err = nft_value_dump(skb, data, len);
11327                 break;
11328         case NFT_DATA_VERDICT:
11329                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11330                 break;
11331         default:
11332                 err = -EINVAL;
11333                 WARN_ON(1);
11334         }
11335
11336         nla_nest_end(skb, nest);
11337         return err;
11338 }
11339 EXPORT_SYMBOL_GPL(nft_data_dump);
11340
11341 int __nft_release_basechain(struct nft_ctx *ctx)
11342 {
11343         struct nft_rule *rule, *nr;
11344
11345         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11346                 return 0;
11347
11348         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11349         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11350                 list_del(&rule->list);
11351                 nft_use_dec(&ctx->chain->use);
11352                 nf_tables_rule_release(ctx, rule);
11353         }
11354         nft_chain_del(ctx->chain);
11355         nft_use_dec(&ctx->table->use);
11356         nf_tables_chain_destroy(ctx);
11357
11358         return 0;
11359 }
11360 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11361
11362 static void __nft_release_hook(struct net *net, struct nft_table *table)
11363 {
11364         struct nft_flowtable *flowtable;
11365         struct nft_chain *chain;
11366
11367         list_for_each_entry(chain, &table->chains, list)
11368                 __nf_tables_unregister_hook(net, table, chain, true);
11369         list_for_each_entry(flowtable, &table->flowtables, list)
11370                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11371                                                      true);
11372 }
11373
11374 static void __nft_release_hooks(struct net *net)
11375 {
11376         struct nftables_pernet *nft_net = nft_pernet(net);
11377         struct nft_table *table;
11378
11379         list_for_each_entry(table, &nft_net->tables, list) {
11380                 if (nft_table_has_owner(table))
11381                         continue;
11382
11383                 __nft_release_hook(net, table);
11384         }
11385 }
11386
11387 static void __nft_release_table(struct net *net, struct nft_table *table)
11388 {
11389         struct nft_flowtable *flowtable, *nf;
11390         struct nft_chain *chain, *nc;
11391         struct nft_object *obj, *ne;
11392         struct nft_rule *rule, *nr;
11393         struct nft_set *set, *ns;
11394         struct nft_ctx ctx = {
11395                 .net    = net,
11396                 .family = NFPROTO_NETDEV,
11397         };
11398
11399         ctx.family = table->family;
11400         ctx.table = table;
11401         list_for_each_entry(chain, &table->chains, list) {
11402                 if (nft_chain_binding(chain))
11403                         continue;
11404
11405                 ctx.chain = chain;
11406                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11407                         list_del(&rule->list);
11408                         nft_use_dec(&chain->use);
11409                         nf_tables_rule_release(&ctx, rule);
11410                 }
11411         }
11412         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11413                 list_del(&flowtable->list);
11414                 nft_use_dec(&table->use);
11415                 nf_tables_flowtable_destroy(flowtable);
11416         }
11417         list_for_each_entry_safe(set, ns, &table->sets, list) {
11418                 list_del(&set->list);
11419                 nft_use_dec(&table->use);
11420                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11421                         nft_map_deactivate(&ctx, set);
11422
11423                 nft_set_destroy(&ctx, set);
11424         }
11425         list_for_each_entry_safe(obj, ne, &table->objects, list) {
11426                 nft_obj_del(obj);
11427                 nft_use_dec(&table->use);
11428                 nft_obj_destroy(&ctx, obj);
11429         }
11430         list_for_each_entry_safe(chain, nc, &table->chains, list) {
11431                 ctx.chain = chain;
11432                 nft_chain_del(chain);
11433                 nft_use_dec(&table->use);
11434                 nf_tables_chain_destroy(&ctx);
11435         }
11436         nf_tables_table_destroy(&ctx);
11437 }
11438
11439 static void __nft_release_tables(struct net *net)
11440 {
11441         struct nftables_pernet *nft_net = nft_pernet(net);
11442         struct nft_table *table, *nt;
11443
11444         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11445                 if (nft_table_has_owner(table))
11446                         continue;
11447
11448                 list_del(&table->list);
11449
11450                 __nft_release_table(net, table);
11451         }
11452 }
11453
11454 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11455                             void *ptr)
11456 {
11457         struct nft_table *table, *to_delete[8];
11458         struct nftables_pernet *nft_net;
11459         struct netlink_notify *n = ptr;
11460         struct net *net = n->net;
11461         unsigned int deleted;
11462         bool restart = false;
11463         unsigned int gc_seq;
11464
11465         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11466                 return NOTIFY_DONE;
11467
11468         nft_net = nft_pernet(net);
11469         deleted = 0;
11470         mutex_lock(&nft_net->commit_mutex);
11471
11472         gc_seq = nft_gc_seq_begin(nft_net);
11473
11474         if (!list_empty(&nf_tables_destroy_list))
11475                 nf_tables_trans_destroy_flush_work();
11476 again:
11477         list_for_each_entry(table, &nft_net->tables, list) {
11478                 if (nft_table_has_owner(table) &&
11479                     n->portid == table->nlpid) {
11480                         __nft_release_hook(net, table);
11481                         list_del_rcu(&table->list);
11482                         to_delete[deleted++] = table;
11483                         if (deleted >= ARRAY_SIZE(to_delete))
11484                                 break;
11485                 }
11486         }
11487         if (deleted) {
11488                 restart = deleted >= ARRAY_SIZE(to_delete);
11489                 synchronize_rcu();
11490                 while (deleted)
11491                         __nft_release_table(net, to_delete[--deleted]);
11492
11493                 if (restart)
11494                         goto again;
11495         }
11496         nft_gc_seq_end(nft_net, gc_seq);
11497
11498         mutex_unlock(&nft_net->commit_mutex);
11499
11500         return NOTIFY_DONE;
11501 }
11502
11503 static struct notifier_block nft_nl_notifier = {
11504         .notifier_call  = nft_rcv_nl_event,
11505 };
11506
11507 static int __net_init nf_tables_init_net(struct net *net)
11508 {
11509         struct nftables_pernet *nft_net = nft_pernet(net);
11510
11511         INIT_LIST_HEAD(&nft_net->tables);
11512         INIT_LIST_HEAD(&nft_net->commit_list);
11513         INIT_LIST_HEAD(&nft_net->binding_list);
11514         INIT_LIST_HEAD(&nft_net->module_list);
11515         INIT_LIST_HEAD(&nft_net->notify_list);
11516         mutex_init(&nft_net->commit_mutex);
11517         nft_net->base_seq = 1;
11518         nft_net->gc_seq = 0;
11519         nft_net->validate_state = NFT_VALIDATE_SKIP;
11520
11521         return 0;
11522 }
11523
11524 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11525 {
11526         struct nftables_pernet *nft_net = nft_pernet(net);
11527
11528         mutex_lock(&nft_net->commit_mutex);
11529         __nft_release_hooks(net);
11530         mutex_unlock(&nft_net->commit_mutex);
11531 }
11532
11533 static void __net_exit nf_tables_exit_net(struct net *net)
11534 {
11535         struct nftables_pernet *nft_net = nft_pernet(net);
11536         unsigned int gc_seq;
11537
11538         mutex_lock(&nft_net->commit_mutex);
11539
11540         gc_seq = nft_gc_seq_begin(nft_net);
11541
11542         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
11543
11544         if (!list_empty(&nft_net->module_list))
11545                 nf_tables_module_autoload_cleanup(net);
11546
11547         __nft_release_tables(net);
11548
11549         nft_gc_seq_end(nft_net, gc_seq);
11550
11551         mutex_unlock(&nft_net->commit_mutex);
11552         WARN_ON_ONCE(!list_empty(&nft_net->tables));
11553         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11554         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11555 }
11556
11557 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11558 {
11559         flush_work(&trans_gc_work);
11560 }
11561
11562 static struct pernet_operations nf_tables_net_ops = {
11563         .init           = nf_tables_init_net,
11564         .pre_exit       = nf_tables_pre_exit_net,
11565         .exit           = nf_tables_exit_net,
11566         .exit_batch     = nf_tables_exit_batch,
11567         .id             = &nf_tables_net_id,
11568         .size           = sizeof(struct nftables_pernet),
11569 };
11570
11571 static int __init nf_tables_module_init(void)
11572 {
11573         int err;
11574
11575         err = register_pernet_subsys(&nf_tables_net_ops);
11576         if (err < 0)
11577                 return err;
11578
11579         err = nft_chain_filter_init();
11580         if (err < 0)
11581                 goto err_chain_filter;
11582
11583         err = nf_tables_core_module_init();
11584         if (err < 0)
11585                 goto err_core_module;
11586
11587         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11588         if (err < 0)
11589                 goto err_netdev_notifier;
11590
11591         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11592         if (err < 0)
11593                 goto err_rht_objname;
11594
11595         err = nft_offload_init();
11596         if (err < 0)
11597                 goto err_offload;
11598
11599         err = netlink_register_notifier(&nft_nl_notifier);
11600         if (err < 0)
11601                 goto err_netlink_notifier;
11602
11603         /* must be last */
11604         err = nfnetlink_subsys_register(&nf_tables_subsys);
11605         if (err < 0)
11606                 goto err_nfnl_subsys;
11607
11608         nft_chain_route_init();
11609
11610         return err;
11611
11612 err_nfnl_subsys:
11613         netlink_unregister_notifier(&nft_nl_notifier);
11614 err_netlink_notifier:
11615         nft_offload_exit();
11616 err_offload:
11617         rhltable_destroy(&nft_objname_ht);
11618 err_rht_objname:
11619         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11620 err_netdev_notifier:
11621         nf_tables_core_module_exit();
11622 err_core_module:
11623         nft_chain_filter_fini();
11624 err_chain_filter:
11625         unregister_pernet_subsys(&nf_tables_net_ops);
11626         return err;
11627 }
11628
11629 static void __exit nf_tables_module_exit(void)
11630 {
11631         nfnetlink_subsys_unregister(&nf_tables_subsys);
11632         netlink_unregister_notifier(&nft_nl_notifier);
11633         nft_offload_exit();
11634         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11635         nft_chain_filter_fini();
11636         nft_chain_route_fini();
11637         nf_tables_trans_destroy_flush_work();
11638         unregister_pernet_subsys(&nf_tables_net_ops);
11639         cancel_work_sync(&trans_gc_work);
11640         cancel_work_sync(&trans_destroy_work);
11641         rcu_barrier();
11642         rhltable_destroy(&nft_objname_ht);
11643         nf_tables_core_module_exit();
11644 }
11645
11646 module_init(nf_tables_module_init);
11647 module_exit(nf_tables_module_exit);
11648
11649 MODULE_LICENSE("GPL");
11650 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11651 MODULE_DESCRIPTION("Framework for packet filtering and classification");
11652 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);