net/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
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static LIST_HEAD(nf_tables_gc_list);
  35 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  36 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
  37
  38 enum {
  39         NFT_VALIDATE_SKIP       = 0,
  40         NFT_VALIDATE_NEED,
  41         NFT_VALIDATE_DO,
  42 };
  43
  44 static struct rhltable nft_objname_ht;
  45
  46 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  47 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  48 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  49
  50 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  51 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  52 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  53
  54 static const struct rhashtable_params nft_chain_ht_params = {
  55         .head_offset            = offsetof(struct nft_chain, rhlhead),
  56         .key_offset             = offsetof(struct nft_chain, name),
  57         .hashfn                 = nft_chain_hash,
  58         .obj_hashfn             = nft_chain_hash_obj,
  59         .obj_cmpfn              = nft_chain_hash_cmp,
  60         .automatic_shrinking    = true,
  61 };
  62
  63 static const struct rhashtable_params nft_objname_ht_params = {
  64         .head_offset            = offsetof(struct nft_object, rhlhead),
  65         .key_offset             = offsetof(struct nft_object, key),
  66         .hashfn                 = nft_objname_hash,
  67         .obj_hashfn             = nft_objname_hash_obj,
  68         .obj_cmpfn              = nft_objname_hash_cmp,
  69         .automatic_shrinking    = true,
  70 };
  71
  72 struct nft_audit_data {
  73         struct nft_table *table;
  74         int entries;
  75         int op;
  76         struct list_head list;
  77 };
  78
  79 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  80         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  81         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  82         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  83         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  84         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  85         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  86         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  87         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  88         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  89         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  90         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  91         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  92         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  93         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  94         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  95         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  96         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  97         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  99         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
 100         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
 101         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 102         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 103         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 104         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 105         [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
 106 };
 107
 108 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
 109 {
 110         switch (table->validate_state) {
 111         case NFT_VALIDATE_SKIP:
 112                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 113                 break;
 114         case NFT_VALIDATE_NEED:
 115                 break;
 116         case NFT_VALIDATE_DO:
 117                 if (new_validate_state == NFT_VALIDATE_NEED)
 118                         return;
 119         }
 120
 121         table->validate_state = new_validate_state;
 122 }
 123 static void nf_tables_trans_destroy_work(struct work_struct *w);
 124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 125
 126 static void nft_trans_gc_work(struct work_struct *work);
 127 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
 128
 129 static void nft_ctx_init(struct nft_ctx *ctx,
 130                          struct net *net,
 131                          const struct sk_buff *skb,
 132                          const struct nlmsghdr *nlh,
 133                          u8 family,
 134                          struct nft_table *table,
 135                          struct nft_chain *chain,
 136                          const struct nlattr * const *nla)
 137 {
 138         ctx->net        = net;
 139         ctx->family     = family;
 140         ctx->level      = 0;
 141         ctx->table      = table;
 142         ctx->chain      = chain;
 143         ctx->nla        = nla;
 144         ctx->portid     = NETLINK_CB(skb).portid;
 145         ctx->report     = nlmsg_report(nlh);
 146         ctx->flags      = nlh->nlmsg_flags;
 147         ctx->seq        = nlh->nlmsg_seq;
 148 }
 149
 150 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 151                                              int msg_type, u32 size, gfp_t gfp)
 152 {
 153         struct nft_trans *trans;
 154
 155         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 156         if (trans == NULL)
 157                 return NULL;
 158
 159         INIT_LIST_HEAD(&trans->list);
 160         INIT_LIST_HEAD(&trans->binding_list);
 161         trans->msg_type = msg_type;
 162         trans->ctx      = *ctx;
 163
 164         return trans;
 165 }
 166
 167 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 168                                          int msg_type, u32 size)
 169 {
 170         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 171 }
 172
 173 static void nft_trans_list_del(struct nft_trans *trans)
 174 {
 175         list_del(&trans->list);
 176         list_del(&trans->binding_list);
 177 }
 178
 179 static void nft_trans_destroy(struct nft_trans *trans)
 180 {
 181         nft_trans_list_del(trans);
 182         kfree(trans);
 183 }
 184
 185 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
 186                                  bool bind)
 187 {
 188         struct nftables_pernet *nft_net;
 189         struct net *net = ctx->net;
 190         struct nft_trans *trans;
 191
 192         if (!nft_set_is_anonymous(set))
 193                 return;
 194
 195         nft_net = nft_pernet(net);
 196         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 197                 switch (trans->msg_type) {
 198                 case NFT_MSG_NEWSET:
 199                         if (nft_trans_set(trans) == set)
 200                                 nft_trans_set_bound(trans) = bind;
 201                         break;
 202                 case NFT_MSG_NEWSETELEM:
 203                         if (nft_trans_elem_set(trans) == set)
 204                                 nft_trans_elem_set_bound(trans) = bind;
 205                         break;
 206                 }
 207         }
 208 }
 209
 210 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 211 {
 212         return __nft_set_trans_bind(ctx, set, true);
 213 }
 214
 215 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
 216 {
 217         return __nft_set_trans_bind(ctx, set, false);
 218 }
 219
 220 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
 221                                    struct nft_chain *chain, bool bind)
 222 {
 223         struct nftables_pernet *nft_net;
 224         struct net *net = ctx->net;
 225         struct nft_trans *trans;
 226
 227         if (!nft_chain_binding(chain))
 228                 return;
 229
 230         nft_net = nft_pernet(net);
 231         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 232                 switch (trans->msg_type) {
 233                 case NFT_MSG_NEWCHAIN:
 234                         if (nft_trans_chain(trans) == chain)
 235                                 nft_trans_chain_bound(trans) = bind;
 236                         break;
 237                 case NFT_MSG_NEWRULE:
 238                         if (trans->ctx.chain == chain)
 239                                 nft_trans_rule_bound(trans) = bind;
 240                         break;
 241                 }
 242         }
 243 }
 244
 245 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
 246                                  struct nft_chain *chain)
 247 {
 248         __nft_chain_trans_bind(ctx, chain, true);
 249 }
 250
 251 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 252 {
 253         if (!nft_chain_binding(chain))
 254                 return 0;
 255
 256         if (nft_chain_binding(ctx->chain))
 257                 return -EOPNOTSUPP;
 258
 259         if (chain->bound)
 260                 return -EBUSY;
 261
 262         if (!nft_use_inc(&chain->use))
 263                 return -EMFILE;
 264
 265         chain->bound = true;
 266         nft_chain_trans_bind(ctx, chain);
 267
 268         return 0;
 269 }
 270
 271 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 272 {
 273         __nft_chain_trans_bind(ctx, chain, false);
 274 }
 275
 276 static int nft_netdev_register_hooks(struct net *net,
 277                                      struct list_head *hook_list)
 278 {
 279         struct nft_hook *hook;
 280         int err, j;
 281
 282         j = 0;
 283         list_for_each_entry(hook, hook_list, list) {
 284                 err = nf_register_net_hook(net, &hook->ops);
 285                 if (err < 0)
 286                         goto err_register;
 287
 288                 j++;
 289         }
 290         return 0;
 291
 292 err_register:
 293         list_for_each_entry(hook, hook_list, list) {
 294                 if (j-- <= 0)
 295                         break;
 296
 297                 nf_unregister_net_hook(net, &hook->ops);
 298         }
 299         return err;
 300 }
 301
 302 static void nft_netdev_unregister_hooks(struct net *net,
 303                                         struct list_head *hook_list,
 304                                         bool release_netdev)
 305 {
 306         struct nft_hook *hook, *next;
 307
 308         list_for_each_entry_safe(hook, next, hook_list, list) {
 309                 nf_unregister_net_hook(net, &hook->ops);
 310                 if (release_netdev) {
 311                         list_del(&hook->list);
 312                         kfree_rcu(hook, rcu);
 313                 }
 314         }
 315 }
 316
 317 static int nf_tables_register_hook(struct net *net,
 318                                    const struct nft_table *table,
 319                                    struct nft_chain *chain)
 320 {
 321         struct nft_base_chain *basechain;
 322         const struct nf_hook_ops *ops;
 323
 324         if (table->flags & NFT_TABLE_F_DORMANT ||
 325             !nft_is_base_chain(chain))
 326                 return 0;
 327
 328         basechain = nft_base_chain(chain);
 329         ops = &basechain->ops;
 330
 331         if (basechain->type->ops_register)
 332                 return basechain->type->ops_register(net, ops);
 333
 334         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 335                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 336
 337         return nf_register_net_hook(net, &basechain->ops);
 338 }
 339
 340 static void __nf_tables_unregister_hook(struct net *net,
 341                                         const struct nft_table *table,
 342                                         struct nft_chain *chain,
 343                                         bool release_netdev)
 344 {
 345         struct nft_base_chain *basechain;
 346         const struct nf_hook_ops *ops;
 347
 348         if (table->flags & NFT_TABLE_F_DORMANT ||
 349             !nft_is_base_chain(chain))
 350                 return;
 351         basechain = nft_base_chain(chain);
 352         ops = &basechain->ops;
 353
 354         if (basechain->type->ops_unregister)
 355                 return basechain->type->ops_unregister(net, ops);
 356
 357         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 358                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 359                                             release_netdev);
 360         else
 361                 nf_unregister_net_hook(net, &basechain->ops);
 362 }
 363
 364 static void nf_tables_unregister_hook(struct net *net,
 365                                       const struct nft_table *table,
 366                                       struct nft_chain *chain)
 367 {
 368         return __nf_tables_unregister_hook(net, table, chain, false);
 369 }
 370
 371 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 372 {
 373         struct nftables_pernet *nft_net = nft_pernet(net);
 374
 375         switch (trans->msg_type) {
 376         case NFT_MSG_NEWSET:
 377                 if (!nft_trans_set_update(trans) &&
 378                     nft_set_is_anonymous(nft_trans_set(trans)))
 379                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 380                 break;
 381         case NFT_MSG_NEWCHAIN:
 382                 if (!nft_trans_chain_update(trans) &&
 383                     nft_chain_binding(nft_trans_chain(trans)))
 384                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 385                 break;
 386         }
 387
 388         list_add_tail(&trans->list, &nft_net->commit_list);
 389 }
 390
 391 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 392 {
 393         struct nft_trans *trans;
 394
 395         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 396         if (trans == NULL)
 397                 return -ENOMEM;
 398
 399         if (msg_type == NFT_MSG_NEWTABLE)
 400                 nft_activate_next(ctx->net, ctx->table);
 401
 402         nft_trans_commit_list_add_tail(ctx->net, trans);
 403         return 0;
 404 }
 405
 406 static int nft_deltable(struct nft_ctx *ctx)
 407 {
 408         int err;
 409
 410         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 411         if (err < 0)
 412                 return err;
 413
 414         nft_deactivate_next(ctx->net, ctx->table);
 415         return err;
 416 }
 417
 418 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 419 {
 420         struct nft_trans *trans;
 421
 422         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 423         if (trans == NULL)
 424                 return ERR_PTR(-ENOMEM);
 425
 426         if (msg_type == NFT_MSG_NEWCHAIN) {
 427                 nft_activate_next(ctx->net, ctx->chain);
 428
 429                 if (ctx->nla[NFTA_CHAIN_ID]) {
 430                         nft_trans_chain_id(trans) =
 431                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 432                 }
 433         }
 434         nft_trans_chain(trans) = ctx->chain;
 435         nft_trans_commit_list_add_tail(ctx->net, trans);
 436
 437         return trans;
 438 }
 439
 440 static int nft_delchain(struct nft_ctx *ctx)
 441 {
 442         struct nft_trans *trans;
 443
 444         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 445         if (IS_ERR(trans))
 446                 return PTR_ERR(trans);
 447
 448         nft_use_dec(&ctx->table->use);
 449         nft_deactivate_next(ctx->net, ctx->chain);
 450
 451         return 0;
 452 }
 453
 454 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
 455 {
 456         struct nft_expr *expr;
 457
 458         expr = nft_expr_first(rule);
 459         while (nft_expr_more(rule, expr)) {
 460                 if (expr->ops->activate)
 461                         expr->ops->activate(ctx, expr);
 462
 463                 expr = nft_expr_next(expr);
 464         }
 465 }
 466
 467 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
 468                               enum nft_trans_phase phase)
 469 {
 470         struct nft_expr *expr;
 471
 472         expr = nft_expr_first(rule);
 473         while (nft_expr_more(rule, expr)) {
 474                 if (expr->ops->deactivate)
 475                         expr->ops->deactivate(ctx, expr, phase);
 476
 477                 expr = nft_expr_next(expr);
 478         }
 479 }
 480
 481 static int
 482 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 483 {
 484         /* You cannot delete the same rule twice */
 485         if (nft_is_active_next(ctx->net, rule)) {
 486                 nft_deactivate_next(ctx->net, rule);
 487                 nft_use_dec(&ctx->chain->use);
 488                 return 0;
 489         }
 490         return -ENOENT;
 491 }
 492
 493 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 494                                             struct nft_rule *rule)
 495 {
 496         struct nft_trans *trans;
 497
 498         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 499         if (trans == NULL)
 500                 return NULL;
 501
 502         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 503                 nft_trans_rule_id(trans) =
 504                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 505         }
 506         nft_trans_rule(trans) = rule;
 507         nft_trans_commit_list_add_tail(ctx->net, trans);
 508
 509         return trans;
 510 }
 511
 512 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 513 {
 514         struct nft_flow_rule *flow;
 515         struct nft_trans *trans;
 516         int err;
 517
 518         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 519         if (trans == NULL)
 520                 return -ENOMEM;
 521
 522         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 523                 flow = nft_flow_rule_create(ctx->net, rule);
 524                 if (IS_ERR(flow)) {
 525                         nft_trans_destroy(trans);
 526                         return PTR_ERR(flow);
 527                 }
 528
 529                 nft_trans_flow_rule(trans) = flow;
 530         }
 531
 532         err = nf_tables_delrule_deactivate(ctx, rule);
 533         if (err < 0) {
 534                 nft_trans_destroy(trans);
 535                 return err;
 536         }
 537         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 538
 539         return 0;
 540 }
 541
 542 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 543 {
 544         struct nft_rule *rule;
 545         int err;
 546
 547         list_for_each_entry(rule, &ctx->chain->rules, list) {
 548                 if (!nft_is_active_next(ctx->net, rule))
 549                         continue;
 550
 551                 err = nft_delrule(ctx, rule);
 552                 if (err < 0)
 553                         return err;
 554         }
 555         return 0;
 556 }
 557
 558 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 559                                struct nft_set *set,
 560                                const struct nft_set_desc *desc)
 561 {
 562         struct nft_trans *trans;
 563
 564         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 565         if (trans == NULL)
 566                 return -ENOMEM;
 567
 568         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 569                 nft_trans_set_id(trans) =
 570                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 571                 nft_activate_next(ctx->net, set);
 572         }
 573         nft_trans_set(trans) = set;
 574         if (desc) {
 575                 nft_trans_set_update(trans) = true;
 576                 nft_trans_set_gc_int(trans) = desc->gc_int;
 577                 nft_trans_set_timeout(trans) = desc->timeout;
 578                 nft_trans_set_size(trans) = desc->size;
 579         }
 580         nft_trans_commit_list_add_tail(ctx->net, trans);
 581
 582         return 0;
 583 }
 584
 585 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 586                              struct nft_set *set)
 587 {
 588         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 589 }
 590
 591 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
 592                                   struct nft_set *set,
 593                                   const struct nft_set_iter *iter,
 594                                   struct nft_elem_priv *elem_priv)
 595 {
 596         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
 597
 598         return 0;
 599 }
 600
 601 struct nft_set_elem_catchall {
 602         struct list_head        list;
 603         struct rcu_head         rcu;
 604         struct nft_elem_priv    *elem;
 605 };
 606
 607 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
 608                                         struct nft_set *set)
 609 {
 610         u8 genmask = nft_genmask_next(ctx->net);
 611         struct nft_set_elem_catchall *catchall;
 612         struct nft_set_ext *ext;
 613
 614         list_for_each_entry(catchall, &set->catchall_list, list) {
 615                 ext = nft_set_elem_ext(set, catchall->elem);
 616                 if (!nft_set_elem_active(ext, genmask))
 617                         continue;
 618
 619                 nft_setelem_data_deactivate(ctx->net, set, catchall->elem);
 620                 break;
 621         }
 622 }
 623
 624 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
 625 {
 626         struct nft_set_iter iter = {
 627                 .genmask        = nft_genmask_next(ctx->net),
 628                 .fn             = nft_mapelem_deactivate,
 629         };
 630
 631         set->ops->walk(ctx, set, &iter);
 632         WARN_ON_ONCE(iter.err);
 633
 634         nft_map_catchall_deactivate(ctx, set);
 635 }
 636
 637 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 638 {
 639         int err;
 640
 641         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 642         if (err < 0)
 643                 return err;
 644
 645         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
 646                 nft_map_deactivate(ctx, set);
 647
 648         nft_deactivate_next(ctx->net, set);
 649         nft_use_dec(&ctx->table->use);
 650
 651         return err;
 652 }
 653
 654 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 655                              struct nft_object *obj)
 656 {
 657         struct nft_trans *trans;
 658
 659         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 660         if (trans == NULL)
 661                 return -ENOMEM;
 662
 663         if (msg_type == NFT_MSG_NEWOBJ)
 664                 nft_activate_next(ctx->net, obj);
 665
 666         nft_trans_obj(trans) = obj;
 667         nft_trans_commit_list_add_tail(ctx->net, trans);
 668
 669         return 0;
 670 }
 671
 672 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 673 {
 674         int err;
 675
 676         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 677         if (err < 0)
 678                 return err;
 679
 680         nft_deactivate_next(ctx->net, obj);
 681         nft_use_dec(&ctx->table->use);
 682
 683         return err;
 684 }
 685
 686 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 687                                    struct nft_flowtable *flowtable)
 688 {
 689         struct nft_trans *trans;
 690
 691         trans = nft_trans_alloc(ctx, msg_type,
 692                                 sizeof(struct nft_trans_flowtable));
 693         if (trans == NULL)
 694                 return -ENOMEM;
 695
 696         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 697                 nft_activate_next(ctx->net, flowtable);
 698
 699         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 700         nft_trans_flowtable(trans) = flowtable;
 701         nft_trans_commit_list_add_tail(ctx->net, trans);
 702
 703         return 0;
 704 }
 705
 706 static int nft_delflowtable(struct nft_ctx *ctx,
 707                             struct nft_flowtable *flowtable)
 708 {
 709         int err;
 710
 711         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 712         if (err < 0)
 713                 return err;
 714
 715         nft_deactivate_next(ctx->net, flowtable);
 716         nft_use_dec(&ctx->table->use);
 717
 718         return err;
 719 }
 720
 721 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 722 {
 723         int i;
 724
 725         for (i = track->regs[dreg].num_reg; i > 0; i--)
 726                 __nft_reg_track_cancel(track, dreg - i);
 727 }
 728
 729 static void __nft_reg_track_update(struct nft_regs_track *track,
 730                                    const struct nft_expr *expr,
 731                                    u8 dreg, u8 num_reg)
 732 {
 733         track->regs[dreg].selector = expr;
 734         track->regs[dreg].bitwise = NULL;
 735         track->regs[dreg].num_reg = num_reg;
 736 }
 737
 738 void nft_reg_track_update(struct nft_regs_track *track,
 739                           const struct nft_expr *expr, u8 dreg, u8 len)
 740 {
 741         unsigned int regcount;
 742         int i;
 743
 744         __nft_reg_track_clobber(track, dreg);
 745
 746         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 747         for (i = 0; i < regcount; i++, dreg++)
 748                 __nft_reg_track_update(track, expr, dreg, i);
 749 }
 750 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 751
 752 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 753 {
 754         unsigned int regcount;
 755         int i;
 756
 757         __nft_reg_track_clobber(track, dreg);
 758
 759         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 760         for (i = 0; i < regcount; i++, dreg++)
 761                 __nft_reg_track_cancel(track, dreg);
 762 }
 763 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 764
 765 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 766 {
 767         track->regs[dreg].selector = NULL;
 768         track->regs[dreg].bitwise = NULL;
 769         track->regs[dreg].num_reg = 0;
 770 }
 771 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 772
 773 /*
 774  * Tables
 775  */
 776
 777 static struct nft_table *nft_table_lookup(const struct net *net,
 778                                           const struct nlattr *nla,
 779                                           u8 family, u8 genmask, u32 nlpid)
 780 {
 781         struct nftables_pernet *nft_net;
 782         struct nft_table *table;
 783
 784         if (nla == NULL)
 785                 return ERR_PTR(-EINVAL);
 786
 787         nft_net = nft_pernet(net);
 788         list_for_each_entry_rcu(table, &nft_net->tables, list,
 789                                 lockdep_is_held(&nft_net->commit_mutex)) {
 790                 if (!nla_strcmp(nla, table->name) &&
 791                     table->family == family &&
 792                     nft_active_genmask(table, genmask)) {
 793                         if (nft_table_has_owner(table) &&
 794                             nlpid && table->nlpid != nlpid)
 795                                 return ERR_PTR(-EPERM);
 796
 797                         return table;
 798                 }
 799         }
 800
 801         return ERR_PTR(-ENOENT);
 802 }
 803
 804 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 805                                                    const struct nlattr *nla,
 806                                                    int family, u8 genmask, u32 nlpid)
 807 {
 808         struct nftables_pernet *nft_net;
 809         struct nft_table *table;
 810
 811         nft_net = nft_pernet(net);
 812         list_for_each_entry(table, &nft_net->tables, list) {
 813                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 814                     table->family == family &&
 815                     nft_active_genmask(table, genmask)) {
 816                         if (nft_table_has_owner(table) &&
 817                             nlpid && table->nlpid != nlpid)
 818                                 return ERR_PTR(-EPERM);
 819
 820                         return table;
 821                 }
 822         }
 823
 824         return ERR_PTR(-ENOENT);
 825 }
 826
 827 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 828 {
 829         return ++table->hgenerator;
 830 }
 831
 832 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 833
 834 static const struct nft_chain_type *
 835 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 836 {
 837         if (family >= NFPROTO_NUMPROTO ||
 838             type >= NFT_CHAIN_T_MAX)
 839                 return NULL;
 840
 841         return chain_type[family][type];
 842 }
 843
 844 static const struct nft_chain_type *
 845 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 846 {
 847         const struct nft_chain_type *type;
 848         int i;
 849
 850         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 851                 type = __nft_chain_type_get(family, i);
 852                 if (!type)
 853                         continue;
 854                 if (!nla_strcmp(nla, type->name))
 855                         return type;
 856         }
 857         return NULL;
 858 }
 859
 860 struct nft_module_request {
 861         struct list_head        list;
 862         char                    module[MODULE_NAME_LEN];
 863         bool                    done;
 864 };
 865
 866 #ifdef CONFIG_MODULES
 867 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 868                                       ...)
 869 {
 870         char module_name[MODULE_NAME_LEN];
 871         struct nftables_pernet *nft_net;
 872         struct nft_module_request *req;
 873         va_list args;
 874         int ret;
 875
 876         va_start(args, fmt);
 877         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 878         va_end(args);
 879         if (ret >= MODULE_NAME_LEN)
 880                 return 0;
 881
 882         nft_net = nft_pernet(net);
 883         list_for_each_entry(req, &nft_net->module_list, list) {
 884                 if (!strcmp(req->module, module_name)) {
 885                         if (req->done)
 886                                 return 0;
 887
 888                         /* A request to load this module already exists. */
 889                         return -EAGAIN;
 890                 }
 891         }
 892
 893         req = kmalloc(sizeof(*req), GFP_KERNEL);
 894         if (!req)
 895                 return -ENOMEM;
 896
 897         req->done = false;
 898         strscpy(req->module, module_name, MODULE_NAME_LEN);
 899         list_add_tail(&req->list, &nft_net->module_list);
 900
 901         return -EAGAIN;
 902 }
 903 EXPORT_SYMBOL_GPL(nft_request_module);
 904 #endif
 905
 906 static void lockdep_nfnl_nft_mutex_not_held(void)
 907 {
 908 #ifdef CONFIG_PROVE_LOCKING
 909         if (debug_locks)
 910                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 911 #endif
 912 }
 913
 914 static const struct nft_chain_type *
 915 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 916                             u8 family, bool autoload)
 917 {
 918         const struct nft_chain_type *type;
 919
 920         type = __nf_tables_chain_type_lookup(nla, family);
 921         if (type != NULL)
 922                 return type;
 923
 924         lockdep_nfnl_nft_mutex_not_held();
 925 #ifdef CONFIG_MODULES
 926         if (autoload) {
 927                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 928                                        nla_len(nla),
 929                                        (const char *)nla_data(nla)) == -EAGAIN)
 930                         return ERR_PTR(-EAGAIN);
 931         }
 932 #endif
 933         return ERR_PTR(-ENOENT);
 934 }
 935
 936 static __be16 nft_base_seq(const struct net *net)
 937 {
 938         struct nftables_pernet *nft_net = nft_pernet(net);
 939
 940         return htons(nft_net->base_seq & 0xffff);
 941 }
 942
 943 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 944         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 945                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 946         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 947         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 948         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 949                                     .len = NFT_USERDATA_MAXLEN }
 950 };
 951
 952 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 953                                      u32 portid, u32 seq, int event, u32 flags,
 954                                      int family, const struct nft_table *table)
 955 {
 956         struct nlmsghdr *nlh;
 957
 958         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 959         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 960                            NFNETLINK_V0, nft_base_seq(net));
 961         if (!nlh)
 962                 goto nla_put_failure;
 963
 964         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 965             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 966             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 967                          NFTA_TABLE_PAD))
 968                 goto nla_put_failure;
 969
 970         if (event == NFT_MSG_DELTABLE) {
 971                 nlmsg_end(skb, nlh);
 972                 return 0;
 973         }
 974
 975         if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
 976                          htonl(table->flags & NFT_TABLE_F_MASK)))
 977                 goto nla_put_failure;
 978
 979         if (nft_table_has_owner(table) &&
 980             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 981                 goto nla_put_failure;
 982
 983         if (table->udata) {
 984                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 985                         goto nla_put_failure;
 986         }
 987
 988         nlmsg_end(skb, nlh);
 989         return 0;
 990
 991 nla_put_failure:
 992         nlmsg_trim(skb, nlh);
 993         return -1;
 994 }
 995
 996 struct nftnl_skb_parms {
 997         bool report;
 998 };
 999 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
1000
1001 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1002                                struct list_head *notify_list)
1003 {
1004         NFT_CB(skb).report = report;
1005         list_add_tail(&skb->list, notify_list);
1006 }
1007
1008 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1009 {
1010         struct nftables_pernet *nft_net;
1011         struct sk_buff *skb;
1012         u16 flags = 0;
1013         int err;
1014
1015         if (!ctx->report &&
1016             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1017                 return;
1018
1019         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1020         if (skb == NULL)
1021                 goto err;
1022
1023         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1024                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1025
1026         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1027                                         event, flags, ctx->family, ctx->table);
1028         if (err < 0) {
1029                 kfree_skb(skb);
1030                 goto err;
1031         }
1032
1033         nft_net = nft_pernet(ctx->net);
1034         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1035         return;
1036 err:
1037         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1038 }
1039
1040 static int nf_tables_dump_tables(struct sk_buff *skb,
1041                                  struct netlink_callback *cb)
1042 {
1043         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1044         struct nftables_pernet *nft_net;
1045         const struct nft_table *table;
1046         unsigned int idx = 0, s_idx = cb->args[0];
1047         struct net *net = sock_net(skb->sk);
1048         int family = nfmsg->nfgen_family;
1049
1050         rcu_read_lock();
1051         nft_net = nft_pernet(net);
1052         cb->seq = READ_ONCE(nft_net->base_seq);
1053
1054         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1055                 if (family != NFPROTO_UNSPEC && family != table->family)
1056                         continue;
1057
1058                 if (idx < s_idx)
1059                         goto cont;
1060                 if (idx > s_idx)
1061                         memset(&cb->args[1], 0,
1062                                sizeof(cb->args) - sizeof(cb->args[0]));
1063                 if (!nft_is_active(net, table))
1064                         continue;
1065                 if (nf_tables_fill_table_info(skb, net,
1066                                               NETLINK_CB(cb->skb).portid,
1067                                               cb->nlh->nlmsg_seq,
1068                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
1069                                               table->family, table) < 0)
1070                         goto done;
1071
1072                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1073 cont:
1074                 idx++;
1075         }
1076 done:
1077         rcu_read_unlock();
1078         cb->args[0] = idx;
1079         return skb->len;
1080 }
1081
1082 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1083                                       const struct nlmsghdr *nlh,
1084                                       struct netlink_dump_control *c)
1085 {
1086         int err;
1087
1088         if (!try_module_get(THIS_MODULE))
1089                 return -EINVAL;
1090
1091         rcu_read_unlock();
1092         err = netlink_dump_start(nlsk, skb, nlh, c);
1093         rcu_read_lock();
1094         module_put(THIS_MODULE);
1095
1096         return err;
1097 }
1098
1099 /* called with rcu_read_lock held */
1100 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1101                               const struct nlattr * const nla[])
1102 {
1103         struct netlink_ext_ack *extack = info->extack;
1104         u8 genmask = nft_genmask_cur(info->net);
1105         u8 family = info->nfmsg->nfgen_family;
1106         const struct nft_table *table;
1107         struct net *net = info->net;
1108         struct sk_buff *skb2;
1109         int err;
1110
1111         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1112                 struct netlink_dump_control c = {
1113                         .dump = nf_tables_dump_tables,
1114                         .module = THIS_MODULE,
1115                 };
1116
1117                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1118         }
1119
1120         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1121         if (IS_ERR(table)) {
1122                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1123                 return PTR_ERR(table);
1124         }
1125
1126         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1127         if (!skb2)
1128                 return -ENOMEM;
1129
1130         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1131                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1132                                         0, family, table);
1133         if (err < 0)
1134                 goto err_fill_table_info;
1135
1136         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1137
1138 err_fill_table_info:
1139         kfree_skb(skb2);
1140         return err;
1141 }
1142
1143 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1144 {
1145         struct nft_chain *chain;
1146         u32 i = 0;
1147
1148         list_for_each_entry(chain, &table->chains, list) {
1149                 if (!nft_is_active_next(net, chain))
1150                         continue;
1151                 if (!nft_is_base_chain(chain))
1152                         continue;
1153
1154                 if (cnt && i++ == cnt)
1155                         break;
1156
1157                 nf_tables_unregister_hook(net, table, chain);
1158         }
1159 }
1160
1161 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1162 {
1163         struct nft_chain *chain;
1164         int err, i = 0;
1165
1166         list_for_each_entry(chain, &table->chains, list) {
1167                 if (!nft_is_active_next(net, chain))
1168                         continue;
1169                 if (!nft_is_base_chain(chain))
1170                         continue;
1171
1172                 err = nf_tables_register_hook(net, table, chain);
1173                 if (err < 0)
1174                         goto err_register_hooks;
1175
1176                 i++;
1177         }
1178         return 0;
1179
1180 err_register_hooks:
1181         if (i)
1182                 nft_table_disable(net, table, i);
1183         return err;
1184 }
1185
1186 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1187 {
1188         table->flags &= ~NFT_TABLE_F_DORMANT;
1189         nft_table_disable(net, table, 0);
1190         table->flags |= NFT_TABLE_F_DORMANT;
1191 }
1192
1193 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1194 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1195 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1196 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1197                                          __NFT_TABLE_F_WAS_AWAKEN)
1198
1199 static int nf_tables_updtable(struct nft_ctx *ctx)
1200 {
1201         struct nft_trans *trans;
1202         u32 flags;
1203         int ret;
1204
1205         if (!ctx->nla[NFTA_TABLE_FLAGS])
1206                 return 0;
1207
1208         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1209         if (flags & ~NFT_TABLE_F_MASK)
1210                 return -EOPNOTSUPP;
1211
1212         if (flags == ctx->table->flags)
1213                 return 0;
1214
1215         if ((nft_table_has_owner(ctx->table) &&
1216              !(flags & NFT_TABLE_F_OWNER)) ||
1217             (!nft_table_has_owner(ctx->table) &&
1218              flags & NFT_TABLE_F_OWNER))
1219                 return -EOPNOTSUPP;
1220
1221         /* No dormant off/on/off/on games in single transaction */
1222         if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1223                 return -EINVAL;
1224
1225         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1226                                 sizeof(struct nft_trans_table));
1227         if (trans == NULL)
1228                 return -ENOMEM;
1229
1230         if ((flags & NFT_TABLE_F_DORMANT) &&
1231             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1232                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1233                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1234                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1235         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1236                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1237                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1238                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1239                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1240                         if (ret < 0)
1241                                 goto err_register_hooks;
1242
1243                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1244                 }
1245         }
1246
1247         nft_trans_table_update(trans) = true;
1248         nft_trans_commit_list_add_tail(ctx->net, trans);
1249
1250         return 0;
1251
1252 err_register_hooks:
1253         nft_trans_destroy(trans);
1254         return ret;
1255 }
1256
1257 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1258 {
1259         const char *name = data;
1260
1261         return jhash(name, strlen(name), seed);
1262 }
1263
1264 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1265 {
1266         const struct nft_chain *chain = data;
1267
1268         return nft_chain_hash(chain->name, 0, seed);
1269 }
1270
1271 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1272                               const void *ptr)
1273 {
1274         const struct nft_chain *chain = ptr;
1275         const char *name = arg->key;
1276
1277         return strcmp(chain->name, name);
1278 }
1279
1280 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1281 {
1282         const struct nft_object_hash_key *k = data;
1283
1284         seed ^= hash_ptr(k->table, 32);
1285
1286         return jhash(k->name, strlen(k->name), seed);
1287 }
1288
1289 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1290 {
1291         const struct nft_object *obj = data;
1292
1293         return nft_objname_hash(&obj->key, 0, seed);
1294 }
1295
1296 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1297                                 const void *ptr)
1298 {
1299         const struct nft_object_hash_key *k = arg->key;
1300         const struct nft_object *obj = ptr;
1301
1302         if (obj->key.table != k->table)
1303                 return -1;
1304
1305         return strcmp(obj->key.name, k->name);
1306 }
1307
1308 static bool nft_supported_family(u8 family)
1309 {
1310         return false
1311 #ifdef CONFIG_NF_TABLES_INET
1312                 || family == NFPROTO_INET
1313 #endif
1314 #ifdef CONFIG_NF_TABLES_IPV4
1315                 || family == NFPROTO_IPV4
1316 #endif
1317 #ifdef CONFIG_NF_TABLES_ARP
1318                 || family == NFPROTO_ARP
1319 #endif
1320 #ifdef CONFIG_NF_TABLES_NETDEV
1321                 || family == NFPROTO_NETDEV
1322 #endif
1323 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1324                 || family == NFPROTO_BRIDGE
1325 #endif
1326 #ifdef CONFIG_NF_TABLES_IPV6
1327                 || family == NFPROTO_IPV6
1328 #endif
1329                 ;
1330 }
1331
1332 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1333                               const struct nlattr * const nla[])
1334 {
1335         struct nftables_pernet *nft_net = nft_pernet(info->net);
1336         struct netlink_ext_ack *extack = info->extack;
1337         u8 genmask = nft_genmask_next(info->net);
1338         u8 family = info->nfmsg->nfgen_family;
1339         struct net *net = info->net;
1340         const struct nlattr *attr;
1341         struct nft_table *table;
1342         struct nft_ctx ctx;
1343         u32 flags = 0;
1344         int err;
1345
1346         if (!nft_supported_family(family))
1347                 return -EOPNOTSUPP;
1348
1349         lockdep_assert_held(&nft_net->commit_mutex);
1350         attr = nla[NFTA_TABLE_NAME];
1351         table = nft_table_lookup(net, attr, family, genmask,
1352                                  NETLINK_CB(skb).portid);
1353         if (IS_ERR(table)) {
1354                 if (PTR_ERR(table) != -ENOENT)
1355                         return PTR_ERR(table);
1356         } else {
1357                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1358                         NL_SET_BAD_ATTR(extack, attr);
1359                         return -EEXIST;
1360                 }
1361                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1362                         return -EOPNOTSUPP;
1363
1364                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1365
1366                 return nf_tables_updtable(&ctx);
1367         }
1368
1369         if (nla[NFTA_TABLE_FLAGS]) {
1370                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1371                 if (flags & ~NFT_TABLE_F_MASK)
1372                         return -EOPNOTSUPP;
1373         }
1374
1375         err = -ENOMEM;
1376         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1377         if (table == NULL)
1378                 goto err_kzalloc;
1379
1380         table->validate_state = nft_net->validate_state;
1381         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1382         if (table->name == NULL)
1383                 goto err_strdup;
1384
1385         if (nla[NFTA_TABLE_USERDATA]) {
1386                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1387                 if (table->udata == NULL)
1388                         goto err_table_udata;
1389
1390                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1391         }
1392
1393         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1394         if (err)
1395                 goto err_chain_ht;
1396
1397         INIT_LIST_HEAD(&table->chains);
1398         INIT_LIST_HEAD(&table->sets);
1399         INIT_LIST_HEAD(&table->objects);
1400         INIT_LIST_HEAD(&table->flowtables);
1401         table->family = family;
1402         table->flags = flags;
1403         table->handle = ++nft_net->table_handle;
1404         if (table->flags & NFT_TABLE_F_OWNER)
1405                 table->nlpid = NETLINK_CB(skb).portid;
1406
1407         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1408         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1409         if (err < 0)
1410                 goto err_trans;
1411
1412         list_add_tail_rcu(&table->list, &nft_net->tables);
1413         return 0;
1414 err_trans:
1415         rhltable_destroy(&table->chains_ht);
1416 err_chain_ht:
1417         kfree(table->udata);
1418 err_table_udata:
1419         kfree(table->name);
1420 err_strdup:
1421         kfree(table);
1422 err_kzalloc:
1423         return err;
1424 }
1425
1426 static int nft_flush_table(struct nft_ctx *ctx)
1427 {
1428         struct nft_flowtable *flowtable, *nft;
1429         struct nft_chain *chain, *nc;
1430         struct nft_object *obj, *ne;
1431         struct nft_set *set, *ns;
1432         int err;
1433
1434         list_for_each_entry(chain, &ctx->table->chains, list) {
1435                 if (!nft_is_active_next(ctx->net, chain))
1436                         continue;
1437
1438                 if (nft_chain_binding(chain))
1439                         continue;
1440
1441                 ctx->chain = chain;
1442
1443                 err = nft_delrule_by_chain(ctx);
1444                 if (err < 0)
1445                         goto out;
1446         }
1447
1448         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1449                 if (!nft_is_active_next(ctx->net, set))
1450                         continue;
1451
1452                 if (nft_set_is_anonymous(set))
1453                         continue;
1454
1455                 err = nft_delset(ctx, set);
1456                 if (err < 0)
1457                         goto out;
1458         }
1459
1460         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1461                 if (!nft_is_active_next(ctx->net, flowtable))
1462                         continue;
1463
1464                 err = nft_delflowtable(ctx, flowtable);
1465                 if (err < 0)
1466                         goto out;
1467         }
1468
1469         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1470                 if (!nft_is_active_next(ctx->net, obj))
1471                         continue;
1472
1473                 err = nft_delobj(ctx, obj);
1474                 if (err < 0)
1475                         goto out;
1476         }
1477
1478         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1479                 if (!nft_is_active_next(ctx->net, chain))
1480                         continue;
1481
1482                 if (nft_chain_binding(chain))
1483                         continue;
1484
1485                 ctx->chain = chain;
1486
1487                 err = nft_delchain(ctx);
1488                 if (err < 0)
1489                         goto out;
1490         }
1491
1492         err = nft_deltable(ctx);
1493 out:
1494         return err;
1495 }
1496
1497 static int nft_flush(struct nft_ctx *ctx, int family)
1498 {
1499         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1500         const struct nlattr * const *nla = ctx->nla;
1501         struct nft_table *table, *nt;
1502         int err = 0;
1503
1504         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1505                 if (family != AF_UNSPEC && table->family != family)
1506                         continue;
1507
1508                 ctx->family = table->family;
1509
1510                 if (!nft_is_active_next(ctx->net, table))
1511                         continue;
1512
1513                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1514                         continue;
1515
1516                 if (nla[NFTA_TABLE_NAME] &&
1517                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1518                         continue;
1519
1520                 ctx->table = table;
1521
1522                 err = nft_flush_table(ctx);
1523                 if (err < 0)
1524                         goto out;
1525         }
1526 out:
1527         return err;
1528 }
1529
1530 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1531                               const struct nlattr * const nla[])
1532 {
1533         struct netlink_ext_ack *extack = info->extack;
1534         u8 genmask = nft_genmask_next(info->net);
1535         u8 family = info->nfmsg->nfgen_family;
1536         struct net *net = info->net;
1537         const struct nlattr *attr;
1538         struct nft_table *table;
1539         struct nft_ctx ctx;
1540
1541         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1542         if (family == AF_UNSPEC ||
1543             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1544                 return nft_flush(&ctx, family);
1545
1546         if (nla[NFTA_TABLE_HANDLE]) {
1547                 attr = nla[NFTA_TABLE_HANDLE];
1548                 table = nft_table_lookup_byhandle(net, attr, family, genmask,
1549                                                   NETLINK_CB(skb).portid);
1550         } else {
1551                 attr = nla[NFTA_TABLE_NAME];
1552                 table = nft_table_lookup(net, attr, family, genmask,
1553                                          NETLINK_CB(skb).portid);
1554         }
1555
1556         if (IS_ERR(table)) {
1557                 if (PTR_ERR(table) == -ENOENT &&
1558                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1559                         return 0;
1560
1561                 NL_SET_BAD_ATTR(extack, attr);
1562                 return PTR_ERR(table);
1563         }
1564
1565         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1566             table->use > 0)
1567                 return -EBUSY;
1568
1569         ctx.family = family;
1570         ctx.table = table;
1571
1572         return nft_flush_table(&ctx);
1573 }
1574
1575 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1576 {
1577         if (WARN_ON(ctx->table->use > 0))
1578                 return;
1579
1580         rhltable_destroy(&ctx->table->chains_ht);
1581         kfree(ctx->table->name);
1582         kfree(ctx->table->udata);
1583         kfree(ctx->table);
1584 }
1585
1586 void nft_register_chain_type(const struct nft_chain_type *ctype)
1587 {
1588         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1589         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1590                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1591                 return;
1592         }
1593         chain_type[ctype->family][ctype->type] = ctype;
1594         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1595 }
1596 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1597
1598 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1599 {
1600         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1601         chain_type[ctype->family][ctype->type] = NULL;
1602         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1603 }
1604 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1605
1606 /*
1607  * Chains
1608  */
1609
1610 static struct nft_chain *
1611 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1612 {
1613         struct nft_chain *chain;
1614
1615         list_for_each_entry(chain, &table->chains, list) {
1616                 if (chain->handle == handle &&
1617                     nft_active_genmask(chain, genmask))
1618                         return chain;
1619         }
1620
1621         return ERR_PTR(-ENOENT);
1622 }
1623
1624 static bool lockdep_commit_lock_is_held(const struct net *net)
1625 {
1626 #ifdef CONFIG_PROVE_LOCKING
1627         struct nftables_pernet *nft_net = nft_pernet(net);
1628
1629         return lockdep_is_held(&nft_net->commit_mutex);
1630 #else
1631         return true;
1632 #endif
1633 }
1634
1635 static struct nft_chain *nft_chain_lookup(struct net *net,
1636                                           struct nft_table *table,
1637                                           const struct nlattr *nla, u8 genmask)
1638 {
1639         char search[NFT_CHAIN_MAXNAMELEN + 1];
1640         struct rhlist_head *tmp, *list;
1641         struct nft_chain *chain;
1642
1643         if (nla == NULL)
1644                 return ERR_PTR(-EINVAL);
1645
1646         nla_strscpy(search, nla, sizeof(search));
1647
1648         WARN_ON(!rcu_read_lock_held() &&
1649                 !lockdep_commit_lock_is_held(net));
1650
1651         chain = ERR_PTR(-ENOENT);
1652         rcu_read_lock();
1653         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1654         if (!list)
1655                 goto out_unlock;
1656
1657         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1658                 if (nft_active_genmask(chain, genmask))
1659                         goto out_unlock;
1660         }
1661         chain = ERR_PTR(-ENOENT);
1662 out_unlock:
1663         rcu_read_unlock();
1664         return chain;
1665 }
1666
1667 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1668         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1669                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1670         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1671         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1672                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1673         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1674         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1675         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1676                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1677         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1678         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1679         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1680         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1681                                     .len = NFT_USERDATA_MAXLEN },
1682 };
1683
1684 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1685         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1686         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1687         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1688                                     .len = IFNAMSIZ - 1 },
1689 };
1690
1691 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1692 {
1693         struct nft_stats *cpu_stats, total;
1694         struct nlattr *nest;
1695         unsigned int seq;
1696         u64 pkts, bytes;
1697         int cpu;
1698
1699         if (!stats)
1700                 return 0;
1701
1702         memset(&total, 0, sizeof(total));
1703         for_each_possible_cpu(cpu) {
1704                 cpu_stats = per_cpu_ptr(stats, cpu);
1705                 do {
1706                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1707                         pkts = cpu_stats->pkts;
1708                         bytes = cpu_stats->bytes;
1709                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1710                 total.pkts += pkts;
1711                 total.bytes += bytes;
1712         }
1713         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1714         if (nest == NULL)
1715                 goto nla_put_failure;
1716
1717         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1718                          NFTA_COUNTER_PAD) ||
1719             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1720                          NFTA_COUNTER_PAD))
1721                 goto nla_put_failure;
1722
1723         nla_nest_end(skb, nest);
1724         return 0;
1725
1726 nla_put_failure:
1727         return -ENOSPC;
1728 }
1729
1730 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1731                                    const struct nft_base_chain *basechain,
1732                                    const struct list_head *hook_list)
1733 {
1734         const struct nf_hook_ops *ops = &basechain->ops;
1735         struct nft_hook *hook, *first = NULL;
1736         struct nlattr *nest, *nest_devs;
1737         int n = 0;
1738
1739         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1740         if (nest == NULL)
1741                 goto nla_put_failure;
1742         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1743                 goto nla_put_failure;
1744         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1745                 goto nla_put_failure;
1746
1747         if (nft_base_chain_netdev(family, ops->hooknum)) {
1748                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1749                 if (!nest_devs)
1750                         goto nla_put_failure;
1751
1752                 if (!hook_list)
1753                         hook_list = &basechain->hook_list;
1754
1755                 list_for_each_entry(hook, hook_list, list) {
1756                         if (!first)
1757                                 first = hook;
1758
1759                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1760                                            hook->ops.dev->name))
1761                                 goto nla_put_failure;
1762                         n++;
1763                 }
1764                 nla_nest_end(skb, nest_devs);
1765
1766                 if (n == 1 &&
1767                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1768                         goto nla_put_failure;
1769         }
1770         nla_nest_end(skb, nest);
1771
1772         return 0;
1773 nla_put_failure:
1774         return -1;
1775 }
1776
1777 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1778                                      u32 portid, u32 seq, int event, u32 flags,
1779                                      int family, const struct nft_table *table,
1780                                      const struct nft_chain *chain,
1781                                      const struct list_head *hook_list)
1782 {
1783         struct nlmsghdr *nlh;
1784
1785         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1786         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1787                            NFNETLINK_V0, nft_base_seq(net));
1788         if (!nlh)
1789                 goto nla_put_failure;
1790
1791         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1792             nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1793             nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1794                          NFTA_CHAIN_PAD))
1795                 goto nla_put_failure;
1796
1797         if (event == NFT_MSG_DELCHAIN && !hook_list) {
1798                 nlmsg_end(skb, nlh);
1799                 return 0;
1800         }
1801
1802         if (nft_is_base_chain(chain)) {
1803                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1804                 struct nft_stats __percpu *stats;
1805
1806                 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1807                         goto nla_put_failure;
1808
1809                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1810                                  htonl(basechain->policy)))
1811                         goto nla_put_failure;
1812
1813                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1814                         goto nla_put_failure;
1815
1816                 stats = rcu_dereference_check(basechain->stats,
1817                                               lockdep_commit_lock_is_held(net));
1818                 if (nft_dump_stats(skb, stats))
1819                         goto nla_put_failure;
1820         }
1821
1822         if (chain->flags &&
1823             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1824                 goto nla_put_failure;
1825
1826         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1827                 goto nla_put_failure;
1828
1829         if (chain->udata &&
1830             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1831                 goto nla_put_failure;
1832
1833         nlmsg_end(skb, nlh);
1834         return 0;
1835
1836 nla_put_failure:
1837         nlmsg_trim(skb, nlh);
1838         return -1;
1839 }
1840
1841 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1842                                    const struct list_head *hook_list)
1843 {
1844         struct nftables_pernet *nft_net;
1845         struct sk_buff *skb;
1846         u16 flags = 0;
1847         int err;
1848
1849         if (!ctx->report &&
1850             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1851                 return;
1852
1853         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1854         if (skb == NULL)
1855                 goto err;
1856
1857         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1858                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1859
1860         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1861                                         event, flags, ctx->family, ctx->table,
1862                                         ctx->chain, hook_list);
1863         if (err < 0) {
1864                 kfree_skb(skb);
1865                 goto err;
1866         }
1867
1868         nft_net = nft_pernet(ctx->net);
1869         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1870         return;
1871 err:
1872         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1873 }
1874
1875 static int nf_tables_dump_chains(struct sk_buff *skb,
1876                                  struct netlink_callback *cb)
1877 {
1878         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1879         unsigned int idx = 0, s_idx = cb->args[0];
1880         struct net *net = sock_net(skb->sk);
1881         int family = nfmsg->nfgen_family;
1882         struct nftables_pernet *nft_net;
1883         const struct nft_table *table;
1884         const struct nft_chain *chain;
1885
1886         rcu_read_lock();
1887         nft_net = nft_pernet(net);
1888         cb->seq = READ_ONCE(nft_net->base_seq);
1889
1890         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1891                 if (family != NFPROTO_UNSPEC && family != table->family)
1892                         continue;
1893
1894                 list_for_each_entry_rcu(chain, &table->chains, list) {
1895                         if (idx < s_idx)
1896                                 goto cont;
1897                         if (idx > s_idx)
1898                                 memset(&cb->args[1], 0,
1899                                        sizeof(cb->args) - sizeof(cb->args[0]));
1900                         if (!nft_is_active(net, chain))
1901                                 continue;
1902                         if (nf_tables_fill_chain_info(skb, net,
1903                                                       NETLINK_CB(cb->skb).portid,
1904                                                       cb->nlh->nlmsg_seq,
1905                                                       NFT_MSG_NEWCHAIN,
1906                                                       NLM_F_MULTI,
1907                                                       table->family, table,
1908                                                       chain, NULL) < 0)
1909                                 goto done;
1910
1911                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1912 cont:
1913                         idx++;
1914                 }
1915         }
1916 done:
1917         rcu_read_unlock();
1918         cb->args[0] = idx;
1919         return skb->len;
1920 }
1921
1922 /* called with rcu_read_lock held */
1923 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1924                               const struct nlattr * const nla[])
1925 {
1926         struct netlink_ext_ack *extack = info->extack;
1927         u8 genmask = nft_genmask_cur(info->net);
1928         u8 family = info->nfmsg->nfgen_family;
1929         const struct nft_chain *chain;
1930         struct net *net = info->net;
1931         struct nft_table *table;
1932         struct sk_buff *skb2;
1933         int err;
1934
1935         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1936                 struct netlink_dump_control c = {
1937                         .dump = nf_tables_dump_chains,
1938                         .module = THIS_MODULE,
1939                 };
1940
1941                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1942         }
1943
1944         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1945         if (IS_ERR(table)) {
1946                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1947                 return PTR_ERR(table);
1948         }
1949
1950         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1951         if (IS_ERR(chain)) {
1952                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1953                 return PTR_ERR(chain);
1954         }
1955
1956         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1957         if (!skb2)
1958                 return -ENOMEM;
1959
1960         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1961                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1962                                         0, family, table, chain, NULL);
1963         if (err < 0)
1964                 goto err_fill_chain_info;
1965
1966         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1967
1968 err_fill_chain_info:
1969         kfree_skb(skb2);
1970         return err;
1971 }
1972
1973 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1974         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1975         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1976 };
1977
1978 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1979 {
1980         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1981         struct nft_stats __percpu *newstats;
1982         struct nft_stats *stats;
1983         int err;
1984
1985         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1986                                           nft_counter_policy, NULL);
1987         if (err < 0)
1988                 return ERR_PTR(err);
1989
1990         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1991                 return ERR_PTR(-EINVAL);
1992
1993         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1994         if (newstats == NULL)
1995                 return ERR_PTR(-ENOMEM);
1996
1997         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1998          * are not exposed to userspace.
1999          */
2000         preempt_disable();
2001         stats = this_cpu_ptr(newstats);
2002         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2003         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2004         preempt_enable();
2005
2006         return newstats;
2007 }
2008
2009 static void nft_chain_stats_replace(struct nft_trans *trans)
2010 {
2011         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2012
2013         if (!nft_trans_chain_stats(trans))
2014                 return;
2015
2016         nft_trans_chain_stats(trans) =
2017                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2018                                     lockdep_commit_lock_is_held(trans->ctx.net));
2019
2020         if (!nft_trans_chain_stats(trans))
2021                 static_branch_inc(&nft_counters_enabled);
2022 }
2023
2024 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2025 {
2026         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2027         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2028
2029         if (g0 != g1)
2030                 kvfree(g1);
2031         kvfree(g0);
2032
2033         /* should be NULL either via abort or via successful commit */
2034         WARN_ON_ONCE(chain->blob_next);
2035         kvfree(chain->blob_next);
2036 }
2037
2038 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2039 {
2040         struct nft_chain *chain = ctx->chain;
2041         struct nft_hook *hook, *next;
2042
2043         if (WARN_ON(chain->use > 0))
2044                 return;
2045
2046         /* no concurrent access possible anymore */
2047         nf_tables_chain_free_chain_rules(chain);
2048
2049         if (nft_is_base_chain(chain)) {
2050                 struct nft_base_chain *basechain = nft_base_chain(chain);
2051
2052                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2053                         list_for_each_entry_safe(hook, next,
2054                                                  &basechain->hook_list, list) {
2055                                 list_del_rcu(&hook->list);
2056                                 kfree_rcu(hook, rcu);
2057                         }
2058                 }
2059                 module_put(basechain->type->owner);
2060                 if (rcu_access_pointer(basechain->stats)) {
2061                         static_branch_dec(&nft_counters_enabled);
2062                         free_percpu(rcu_dereference_raw(basechain->stats));
2063                 }
2064                 kfree(chain->name);
2065                 kfree(chain->udata);
2066                 kfree(basechain);
2067         } else {
2068                 kfree(chain->name);
2069                 kfree(chain->udata);
2070                 kfree(chain);
2071         }
2072 }
2073
2074 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2075                                               const struct nlattr *attr)
2076 {
2077         struct net_device *dev;
2078         char ifname[IFNAMSIZ];
2079         struct nft_hook *hook;
2080         int err;
2081
2082         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2083         if (!hook) {
2084                 err = -ENOMEM;
2085                 goto err_hook_alloc;
2086         }
2087
2088         nla_strscpy(ifname, attr, IFNAMSIZ);
2089         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2090          * indirectly serializing all the other holders of the commit_mutex with
2091          * the rtnl_mutex.
2092          */
2093         dev = __dev_get_by_name(net, ifname);
2094         if (!dev) {
2095                 err = -ENOENT;
2096                 goto err_hook_dev;
2097         }
2098         hook->ops.dev = dev;
2099
2100         return hook;
2101
2102 err_hook_dev:
2103         kfree(hook);
2104 err_hook_alloc:
2105         return ERR_PTR(err);
2106 }
2107
2108 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2109                                            const struct nft_hook *this)
2110 {
2111         struct nft_hook *hook;
2112
2113         list_for_each_entry(hook, hook_list, list) {
2114                 if (this->ops.dev == hook->ops.dev)
2115                         return hook;
2116         }
2117
2118         return NULL;
2119 }
2120
2121 static int nf_tables_parse_netdev_hooks(struct net *net,
2122                                         const struct nlattr *attr,
2123                                         struct list_head *hook_list,
2124                                         struct netlink_ext_ack *extack)
2125 {
2126         struct nft_hook *hook, *next;
2127         const struct nlattr *tmp;
2128         int rem, n = 0, err;
2129
2130         nla_for_each_nested(tmp, attr, rem) {
2131                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2132                         err = -EINVAL;
2133                         goto err_hook;
2134                 }
2135
2136                 hook = nft_netdev_hook_alloc(net, tmp);
2137                 if (IS_ERR(hook)) {
2138                         NL_SET_BAD_ATTR(extack, tmp);
2139                         err = PTR_ERR(hook);
2140                         goto err_hook;
2141                 }
2142                 if (nft_hook_list_find(hook_list, hook)) {
2143                         NL_SET_BAD_ATTR(extack, tmp);
2144                         kfree(hook);
2145                         err = -EEXIST;
2146                         goto err_hook;
2147                 }
2148                 list_add_tail(&hook->list, hook_list);
2149                 n++;
2150
2151                 if (n == NFT_NETDEVICE_MAX) {
2152                         err = -EFBIG;
2153                         goto err_hook;
2154                 }
2155         }
2156
2157         return 0;
2158
2159 err_hook:
2160         list_for_each_entry_safe(hook, next, hook_list, list) {
2161                 list_del(&hook->list);
2162                 kfree(hook);
2163         }
2164         return err;
2165 }
2166
2167 struct nft_chain_hook {
2168         u32                             num;
2169         s32                             priority;
2170         const struct nft_chain_type     *type;
2171         struct list_head                list;
2172 };
2173
2174 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2175                                   struct list_head *hook_list,
2176                                   struct netlink_ext_ack *extack, u32 flags)
2177 {
2178         struct nft_hook *hook;
2179         int err;
2180
2181         if (tb[NFTA_HOOK_DEV]) {
2182                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2183                 if (IS_ERR(hook)) {
2184                         NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2185                         return PTR_ERR(hook);
2186                 }
2187
2188                 list_add_tail(&hook->list, hook_list);
2189         } else if (tb[NFTA_HOOK_DEVS]) {
2190                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2191                                                    hook_list, extack);
2192                 if (err < 0)
2193                         return err;
2194
2195         }
2196
2197         if (flags & NFT_CHAIN_HW_OFFLOAD &&
2198             list_empty(hook_list))
2199                 return -EINVAL;
2200
2201         return 0;
2202 }
2203
2204 static int nft_chain_parse_hook(struct net *net,
2205                                 struct nft_base_chain *basechain,
2206                                 const struct nlattr * const nla[],
2207                                 struct nft_chain_hook *hook, u8 family,
2208                                 u32 flags, struct netlink_ext_ack *extack)
2209 {
2210         struct nftables_pernet *nft_net = nft_pernet(net);
2211         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2212         const struct nft_chain_type *type;
2213         int err;
2214
2215         lockdep_assert_held(&nft_net->commit_mutex);
2216         lockdep_nfnl_nft_mutex_not_held();
2217
2218         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2219                                           nla[NFTA_CHAIN_HOOK],
2220                                           nft_hook_policy, NULL);
2221         if (err < 0)
2222                 return err;
2223
2224         if (!basechain) {
2225                 if (!ha[NFTA_HOOK_HOOKNUM] ||
2226                     !ha[NFTA_HOOK_PRIORITY]) {
2227                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2228                         return -ENOENT;
2229                 }
2230
2231                 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2232                 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2233
2234                 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2235                 if (!type)
2236                         return -EOPNOTSUPP;
2237
2238                 if (nla[NFTA_CHAIN_TYPE]) {
2239                         type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2240                                                            family, true);
2241                         if (IS_ERR(type)) {
2242                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2243                                 return PTR_ERR(type);
2244                         }
2245                 }
2246                 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2247                         return -EOPNOTSUPP;
2248
2249                 if (type->type == NFT_CHAIN_T_NAT &&
2250                     hook->priority <= NF_IP_PRI_CONNTRACK)
2251                         return -EOPNOTSUPP;
2252         } else {
2253                 if (ha[NFTA_HOOK_HOOKNUM]) {
2254                         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2255                         if (hook->num != basechain->ops.hooknum)
2256                                 return -EOPNOTSUPP;
2257                 }
2258                 if (ha[NFTA_HOOK_PRIORITY]) {
2259                         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2260                         if (hook->priority != basechain->ops.priority)
2261                                 return -EOPNOTSUPP;
2262                 }
2263
2264                 type = basechain->type;
2265         }
2266
2267         if (!try_module_get(type->owner)) {
2268                 if (nla[NFTA_CHAIN_TYPE])
2269                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2270                 return -ENOENT;
2271         }
2272
2273         hook->type = type;
2274
2275         INIT_LIST_HEAD(&hook->list);
2276         if (nft_base_chain_netdev(family, hook->num)) {
2277                 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2278                 if (err < 0) {
2279                         module_put(type->owner);
2280                         return err;
2281                 }
2282         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2283                 module_put(type->owner);
2284                 return -EOPNOTSUPP;
2285         }
2286
2287         return 0;
2288 }
2289
2290 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2291 {
2292         struct nft_hook *h, *next;
2293
2294         list_for_each_entry_safe(h, next, &hook->list, list) {
2295                 list_del(&h->list);
2296                 kfree(h);
2297         }
2298         module_put(hook->type->owner);
2299 }
2300
2301 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2302 {
2303         struct nft_rule_dp_last *lrule;
2304
2305         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2306
2307         lrule = (struct nft_rule_dp_last *)ptr;
2308         lrule->end.is_last = 1;
2309         lrule->chain = chain;
2310         /* blob size does not include the trailer rule */
2311 }
2312
2313 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2314                                                          unsigned int size)
2315 {
2316         struct nft_rule_blob *blob;
2317
2318         if (size > INT_MAX)
2319                 return NULL;
2320
2321         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2322
2323         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2324         if (!blob)
2325                 return NULL;
2326
2327         blob->size = 0;
2328         nft_last_rule(chain, blob->data);
2329
2330         return blob;
2331 }
2332
2333 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2334                                     const struct nft_chain_hook *hook,
2335                                     struct nft_chain *chain)
2336 {
2337         ops->pf                 = family;
2338         ops->hooknum            = hook->num;
2339         ops->priority           = hook->priority;
2340         ops->priv               = chain;
2341         ops->hook               = hook->type->hooks[ops->hooknum];
2342         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2343 }
2344
2345 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2346                               struct nft_chain_hook *hook, u32 flags)
2347 {
2348         struct nft_chain *chain;
2349         struct nft_hook *h;
2350
2351         basechain->type = hook->type;
2352         INIT_LIST_HEAD(&basechain->hook_list);
2353         chain = &basechain->chain;
2354
2355         if (nft_base_chain_netdev(family, hook->num)) {
2356                 list_splice_init(&hook->list, &basechain->hook_list);
2357                 list_for_each_entry(h, &basechain->hook_list, list)
2358                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2359         }
2360         nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2361
2362         chain->flags |= NFT_CHAIN_BASE | flags;
2363         basechain->policy = NF_ACCEPT;
2364         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2365             !nft_chain_offload_support(basechain)) {
2366                 list_splice_init(&basechain->hook_list, &hook->list);
2367                 return -EOPNOTSUPP;
2368         }
2369
2370         flow_block_init(&basechain->flow_block);
2371
2372         return 0;
2373 }
2374
2375 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2376 {
2377         int err;
2378
2379         err = rhltable_insert_key(&table->chains_ht, chain->name,
2380                                   &chain->rhlhead, nft_chain_ht_params);
2381         if (err)
2382                 return err;
2383
2384         list_add_tail_rcu(&chain->list, &table->chains);
2385
2386         return 0;
2387 }
2388
2389 static u64 chain_id;
2390
2391 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2392                               u8 policy, u32 flags,
2393                               struct netlink_ext_ack *extack)
2394 {
2395         const struct nlattr * const *nla = ctx->nla;
2396         struct nft_table *table = ctx->table;
2397         struct nft_base_chain *basechain;
2398         struct net *net = ctx->net;
2399         char name[NFT_NAME_MAXLEN];
2400         struct nft_rule_blob *blob;
2401         struct nft_trans *trans;
2402         struct nft_chain *chain;
2403         int err;
2404
2405         if (nla[NFTA_CHAIN_HOOK]) {
2406                 struct nft_stats __percpu *stats = NULL;
2407                 struct nft_chain_hook hook = {};
2408
2409                 if (flags & NFT_CHAIN_BINDING)
2410                         return -EOPNOTSUPP;
2411
2412                 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2413                                            extack);
2414                 if (err < 0)
2415                         return err;
2416
2417                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2418                 if (basechain == NULL) {
2419                         nft_chain_release_hook(&hook);
2420                         return -ENOMEM;
2421                 }
2422                 chain = &basechain->chain;
2423
2424                 if (nla[NFTA_CHAIN_COUNTERS]) {
2425                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2426                         if (IS_ERR(stats)) {
2427                                 nft_chain_release_hook(&hook);
2428                                 kfree(basechain);
2429                                 return PTR_ERR(stats);
2430                         }
2431                         rcu_assign_pointer(basechain->stats, stats);
2432                 }
2433
2434                 err = nft_basechain_init(basechain, family, &hook, flags);
2435                 if (err < 0) {
2436                         nft_chain_release_hook(&hook);
2437                         kfree(basechain);
2438                         free_percpu(stats);
2439                         return err;
2440                 }
2441                 if (stats)
2442                         static_branch_inc(&nft_counters_enabled);
2443         } else {
2444                 if (flags & NFT_CHAIN_BASE)
2445                         return -EINVAL;
2446                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2447                         return -EOPNOTSUPP;
2448
2449                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2450                 if (chain == NULL)
2451                         return -ENOMEM;
2452
2453                 chain->flags = flags;
2454         }
2455         ctx->chain = chain;
2456
2457         INIT_LIST_HEAD(&chain->rules);
2458         chain->handle = nf_tables_alloc_handle(table);
2459         chain->table = table;
2460
2461         if (nla[NFTA_CHAIN_NAME]) {
2462                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2463         } else {
2464                 if (!(flags & NFT_CHAIN_BINDING)) {
2465                         err = -EINVAL;
2466                         goto err_destroy_chain;
2467                 }
2468
2469                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2470                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2471         }
2472
2473         if (!chain->name) {
2474                 err = -ENOMEM;
2475                 goto err_destroy_chain;
2476         }
2477
2478         if (nla[NFTA_CHAIN_USERDATA]) {
2479                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2480                 if (chain->udata == NULL) {
2481                         err = -ENOMEM;
2482                         goto err_destroy_chain;
2483                 }
2484                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2485         }
2486
2487         blob = nf_tables_chain_alloc_rules(chain, 0);
2488         if (!blob) {
2489                 err = -ENOMEM;
2490                 goto err_destroy_chain;
2491         }
2492
2493         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2494         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2495
2496         err = nf_tables_register_hook(net, table, chain);
2497         if (err < 0)
2498                 goto err_destroy_chain;
2499
2500         if (!nft_use_inc(&table->use)) {
2501                 err = -EMFILE;
2502                 goto err_use;
2503         }
2504
2505         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2506         if (IS_ERR(trans)) {
2507                 err = PTR_ERR(trans);
2508                 goto err_unregister_hook;
2509         }
2510
2511         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2512         if (nft_is_base_chain(chain))
2513                 nft_trans_chain_policy(trans) = policy;
2514
2515         err = nft_chain_add(table, chain);
2516         if (err < 0) {
2517                 nft_trans_destroy(trans);
2518                 goto err_unregister_hook;
2519         }
2520
2521         return 0;
2522
2523 err_unregister_hook:
2524         nft_use_dec_restore(&table->use);
2525 err_use:
2526         nf_tables_unregister_hook(net, table, chain);
2527 err_destroy_chain:
2528         nf_tables_chain_destroy(ctx);
2529
2530         return err;
2531 }
2532
2533 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2534                               u32 flags, const struct nlattr *attr,
2535                               struct netlink_ext_ack *extack)
2536 {
2537         const struct nlattr * const *nla = ctx->nla;
2538         struct nft_base_chain *basechain = NULL;
2539         struct nft_table *table = ctx->table;
2540         struct nft_chain *chain = ctx->chain;
2541         struct nft_chain_hook hook = {};
2542         struct nft_stats *stats = NULL;
2543         struct nft_hook *h, *next;
2544         struct nf_hook_ops *ops;
2545         struct nft_trans *trans;
2546         bool unregister = false;
2547         int err;
2548
2549         if (chain->flags ^ flags)
2550                 return -EOPNOTSUPP;
2551
2552         INIT_LIST_HEAD(&hook.list);
2553
2554         if (nla[NFTA_CHAIN_HOOK]) {
2555                 if (!nft_is_base_chain(chain)) {
2556                         NL_SET_BAD_ATTR(extack, attr);
2557                         return -EEXIST;
2558                 }
2559
2560                 basechain = nft_base_chain(chain);
2561                 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2562                                            ctx->family, flags, extack);
2563                 if (err < 0)
2564                         return err;
2565
2566                 if (basechain->type != hook.type) {
2567                         nft_chain_release_hook(&hook);
2568                         NL_SET_BAD_ATTR(extack, attr);
2569                         return -EEXIST;
2570                 }
2571
2572                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2573                         list_for_each_entry_safe(h, next, &hook.list, list) {
2574                                 h->ops.pf       = basechain->ops.pf;
2575                                 h->ops.hooknum  = basechain->ops.hooknum;
2576                                 h->ops.priority = basechain->ops.priority;
2577                                 h->ops.priv     = basechain->ops.priv;
2578                                 h->ops.hook     = basechain->ops.hook;
2579
2580                                 if (nft_hook_list_find(&basechain->hook_list, h)) {
2581                                         list_del(&h->list);
2582                                         kfree(h);
2583                                 }
2584                         }
2585                 } else {
2586                         ops = &basechain->ops;
2587                         if (ops->hooknum != hook.num ||
2588                             ops->priority != hook.priority) {
2589                                 nft_chain_release_hook(&hook);
2590                                 NL_SET_BAD_ATTR(extack, attr);
2591                                 return -EEXIST;
2592                         }
2593                 }
2594         }
2595
2596         if (nla[NFTA_CHAIN_HANDLE] &&
2597             nla[NFTA_CHAIN_NAME]) {
2598                 struct nft_chain *chain2;
2599
2600                 chain2 = nft_chain_lookup(ctx->net, table,
2601                                           nla[NFTA_CHAIN_NAME], genmask);
2602                 if (!IS_ERR(chain2)) {
2603                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2604                         err = -EEXIST;
2605                         goto err_hooks;
2606                 }
2607         }
2608
2609         if (nla[NFTA_CHAIN_COUNTERS]) {
2610                 if (!nft_is_base_chain(chain)) {
2611                         err = -EOPNOTSUPP;
2612                         goto err_hooks;
2613                 }
2614
2615                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2616                 if (IS_ERR(stats)) {
2617                         err = PTR_ERR(stats);
2618                         goto err_hooks;
2619                 }
2620         }
2621
2622         if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2623             nft_is_base_chain(chain) &&
2624             !list_empty(&hook.list)) {
2625                 basechain = nft_base_chain(chain);
2626                 ops = &basechain->ops;
2627
2628                 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2629                         err = nft_netdev_register_hooks(ctx->net, &hook.list);
2630                         if (err < 0)
2631                                 goto err_hooks;
2632                 }
2633         }
2634
2635         unregister = true;
2636         err = -ENOMEM;
2637         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2638                                 sizeof(struct nft_trans_chain));
2639         if (trans == NULL)
2640                 goto err_trans;
2641
2642         nft_trans_chain_stats(trans) = stats;
2643         nft_trans_chain_update(trans) = true;
2644
2645         if (nla[NFTA_CHAIN_POLICY])
2646                 nft_trans_chain_policy(trans) = policy;
2647         else
2648                 nft_trans_chain_policy(trans) = -1;
2649
2650         if (nla[NFTA_CHAIN_HANDLE] &&
2651             nla[NFTA_CHAIN_NAME]) {
2652                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2653                 struct nft_trans *tmp;
2654                 char *name;
2655
2656                 err = -ENOMEM;
2657                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2658                 if (!name)
2659                         goto err_trans;
2660
2661                 err = -EEXIST;
2662                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2663                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2664                             tmp->ctx.table == table &&
2665                             nft_trans_chain_update(tmp) &&
2666                             nft_trans_chain_name(tmp) &&
2667                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2668                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2669                                 kfree(name);
2670                                 goto err_trans;
2671                         }
2672                 }
2673
2674                 nft_trans_chain_name(trans) = name;
2675         }
2676
2677         nft_trans_basechain(trans) = basechain;
2678         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2679         list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2680         if (nla[NFTA_CHAIN_HOOK])
2681                 module_put(hook.type->owner);
2682
2683         nft_trans_commit_list_add_tail(ctx->net, trans);
2684
2685         return 0;
2686
2687 err_trans:
2688         free_percpu(stats);
2689         kfree(trans);
2690 err_hooks:
2691         if (nla[NFTA_CHAIN_HOOK]) {
2692                 list_for_each_entry_safe(h, next, &hook.list, list) {
2693                         if (unregister)
2694                                 nf_unregister_net_hook(ctx->net, &h->ops);
2695                         list_del(&h->list);
2696                         kfree_rcu(h, rcu);
2697                 }
2698                 module_put(hook.type->owner);
2699         }
2700
2701         return err;
2702 }
2703
2704 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2705                                                const struct nft_table *table,
2706                                                const struct nlattr *nla, u8 genmask)
2707 {
2708         struct nftables_pernet *nft_net = nft_pernet(net);
2709         u32 id = ntohl(nla_get_be32(nla));
2710         struct nft_trans *trans;
2711
2712         list_for_each_entry(trans, &nft_net->commit_list, list) {
2713                 struct nft_chain *chain = trans->ctx.chain;
2714
2715                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2716                     chain->table == table &&
2717                     id == nft_trans_chain_id(trans) &&
2718                     nft_active_genmask(chain, genmask))
2719                         return chain;
2720         }
2721         return ERR_PTR(-ENOENT);
2722 }
2723
2724 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2725                               const struct nlattr * const nla[])
2726 {
2727         struct nftables_pernet *nft_net = nft_pernet(info->net);
2728         struct netlink_ext_ack *extack = info->extack;
2729         u8 genmask = nft_genmask_next(info->net);
2730         u8 family = info->nfmsg->nfgen_family;
2731         struct nft_chain *chain = NULL;
2732         struct net *net = info->net;
2733         const struct nlattr *attr;
2734         struct nft_table *table;
2735         u8 policy = NF_ACCEPT;
2736         struct nft_ctx ctx;
2737         u64 handle = 0;
2738         u32 flags = 0;
2739
2740         lockdep_assert_held(&nft_net->commit_mutex);
2741
2742         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2743                                  NETLINK_CB(skb).portid);
2744         if (IS_ERR(table)) {
2745                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2746                 return PTR_ERR(table);
2747         }
2748
2749         chain = NULL;
2750         attr = nla[NFTA_CHAIN_NAME];
2751
2752         if (nla[NFTA_CHAIN_HANDLE]) {
2753                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2754                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2755                 if (IS_ERR(chain)) {
2756                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2757                         return PTR_ERR(chain);
2758                 }
2759                 attr = nla[NFTA_CHAIN_HANDLE];
2760         } else if (nla[NFTA_CHAIN_NAME]) {
2761                 chain = nft_chain_lookup(net, table, attr, genmask);
2762                 if (IS_ERR(chain)) {
2763                         if (PTR_ERR(chain) != -ENOENT) {
2764                                 NL_SET_BAD_ATTR(extack, attr);
2765                                 return PTR_ERR(chain);
2766                         }
2767                         chain = NULL;
2768                 }
2769         } else if (!nla[NFTA_CHAIN_ID]) {
2770                 return -EINVAL;
2771         }
2772
2773         if (nla[NFTA_CHAIN_POLICY]) {
2774                 if (chain != NULL &&
2775                     !nft_is_base_chain(chain)) {
2776                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2777                         return -EOPNOTSUPP;
2778                 }
2779
2780                 if (chain == NULL &&
2781                     nla[NFTA_CHAIN_HOOK] == NULL) {
2782                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2783                         return -EOPNOTSUPP;
2784                 }
2785
2786                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2787                 switch (policy) {
2788                 case NF_DROP:
2789                 case NF_ACCEPT:
2790                         break;
2791                 default:
2792                         return -EINVAL;
2793                 }
2794         }
2795
2796         if (nla[NFTA_CHAIN_FLAGS])
2797                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2798         else if (chain)
2799                 flags = chain->flags;
2800
2801         if (flags & ~NFT_CHAIN_FLAGS)
2802                 return -EOPNOTSUPP;
2803
2804         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2805
2806         if (chain != NULL) {
2807                 if (chain->flags & NFT_CHAIN_BINDING)
2808                         return -EINVAL;
2809
2810                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2811                         NL_SET_BAD_ATTR(extack, attr);
2812                         return -EEXIST;
2813                 }
2814                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2815                         return -EOPNOTSUPP;
2816
2817                 flags |= chain->flags & NFT_CHAIN_BASE;
2818                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2819                                           extack);
2820         }
2821
2822         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2823 }
2824
2825 static int nft_delchain_hook(struct nft_ctx *ctx,
2826                              struct nft_base_chain *basechain,
2827                              struct netlink_ext_ack *extack)
2828 {
2829         const struct nft_chain *chain = &basechain->chain;
2830         const struct nlattr * const *nla = ctx->nla;
2831         struct nft_chain_hook chain_hook = {};
2832         struct nft_hook *this, *hook;
2833         LIST_HEAD(chain_del_list);
2834         struct nft_trans *trans;
2835         int err;
2836
2837         err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2838                                    ctx->family, chain->flags, extack);
2839         if (err < 0)
2840                 return err;
2841
2842         list_for_each_entry(this, &chain_hook.list, list) {
2843                 hook = nft_hook_list_find(&basechain->hook_list, this);
2844                 if (!hook) {
2845                         err = -ENOENT;
2846                         goto err_chain_del_hook;
2847                 }
2848                 list_move(&hook->list, &chain_del_list);
2849         }
2850
2851         trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2852                                 sizeof(struct nft_trans_chain));
2853         if (!trans) {
2854                 err = -ENOMEM;
2855                 goto err_chain_del_hook;
2856         }
2857
2858         nft_trans_basechain(trans) = basechain;
2859         nft_trans_chain_update(trans) = true;
2860         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2861         list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2862         nft_chain_release_hook(&chain_hook);
2863
2864         nft_trans_commit_list_add_tail(ctx->net, trans);
2865
2866         return 0;
2867
2868 err_chain_del_hook:
2869         list_splice(&chain_del_list, &basechain->hook_list);
2870         nft_chain_release_hook(&chain_hook);
2871
2872         return err;
2873 }
2874
2875 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2876                               const struct nlattr * const nla[])
2877 {
2878         struct netlink_ext_ack *extack = info->extack;
2879         u8 genmask = nft_genmask_next(info->net);
2880         u8 family = info->nfmsg->nfgen_family;
2881         struct net *net = info->net;
2882         const struct nlattr *attr;
2883         struct nft_table *table;
2884         struct nft_chain *chain;
2885         struct nft_rule *rule;
2886         struct nft_ctx ctx;
2887         u64 handle;
2888         u32 use;
2889         int err;
2890
2891         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2892                                  NETLINK_CB(skb).portid);
2893         if (IS_ERR(table)) {
2894                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2895                 return PTR_ERR(table);
2896         }
2897
2898         if (nla[NFTA_CHAIN_HANDLE]) {
2899                 attr = nla[NFTA_CHAIN_HANDLE];
2900                 handle = be64_to_cpu(nla_get_be64(attr));
2901                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2902         } else {
2903                 attr = nla[NFTA_CHAIN_NAME];
2904                 chain = nft_chain_lookup(net, table, attr, genmask);
2905         }
2906         if (IS_ERR(chain)) {
2907                 if (PTR_ERR(chain) == -ENOENT &&
2908                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2909                         return 0;
2910
2911                 NL_SET_BAD_ATTR(extack, attr);
2912                 return PTR_ERR(chain);
2913         }
2914
2915         if (nft_chain_binding(chain))
2916                 return -EOPNOTSUPP;
2917
2918         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2919
2920         if (nla[NFTA_CHAIN_HOOK]) {
2921                 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2922                         return -EOPNOTSUPP;
2923
2924                 if (nft_is_base_chain(chain)) {
2925                         struct nft_base_chain *basechain = nft_base_chain(chain);
2926
2927                         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2928                                 return nft_delchain_hook(&ctx, basechain, extack);
2929                 }
2930         }
2931
2932         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2933             chain->use > 0)
2934                 return -EBUSY;
2935
2936         use = chain->use;
2937         list_for_each_entry(rule, &chain->rules, list) {
2938                 if (!nft_is_active_next(net, rule))
2939                         continue;
2940                 use--;
2941
2942                 err = nft_delrule(&ctx, rule);
2943                 if (err < 0)
2944                         return err;
2945         }
2946
2947         /* There are rules and elements that are still holding references to us,
2948          * we cannot do a recursive removal in this case.
2949          */
2950         if (use > 0) {
2951                 NL_SET_BAD_ATTR(extack, attr);
2952                 return -EBUSY;
2953         }
2954
2955         return nft_delchain(&ctx);
2956 }
2957
2958 /*
2959  * Expressions
2960  */
2961
2962 /**
2963  *      nft_register_expr - register nf_tables expr type
2964  *      @type: expr type
2965  *
2966  *      Registers the expr type for use with nf_tables. Returns zero on
2967  *      success or a negative errno code otherwise.
2968  */
2969 int nft_register_expr(struct nft_expr_type *type)
2970 {
2971         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2972         if (type->family == NFPROTO_UNSPEC)
2973                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2974         else
2975                 list_add_rcu(&type->list, &nf_tables_expressions);
2976         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2977         return 0;
2978 }
2979 EXPORT_SYMBOL_GPL(nft_register_expr);
2980
2981 /**
2982  *      nft_unregister_expr - unregister nf_tables expr type
2983  *      @type: expr type
2984  *
2985  *      Unregisters the expr typefor use with nf_tables.
2986  */
2987 void nft_unregister_expr(struct nft_expr_type *type)
2988 {
2989         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2990         list_del_rcu(&type->list);
2991         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2992 }
2993 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2994
2995 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2996                                                        struct nlattr *nla)
2997 {
2998         const struct nft_expr_type *type, *candidate = NULL;
2999
3000         list_for_each_entry(type, &nf_tables_expressions, list) {
3001                 if (!nla_strcmp(nla, type->name)) {
3002                         if (!type->family && !candidate)
3003                                 candidate = type;
3004                         else if (type->family == family)
3005                                 candidate = type;
3006                 }
3007         }
3008         return candidate;
3009 }
3010
3011 #ifdef CONFIG_MODULES
3012 static int nft_expr_type_request_module(struct net *net, u8 family,
3013                                         struct nlattr *nla)
3014 {
3015         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3016                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3017                 return -EAGAIN;
3018
3019         return 0;
3020 }
3021 #endif
3022
3023 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3024                                                      u8 family,
3025                                                      struct nlattr *nla)
3026 {
3027         const struct nft_expr_type *type;
3028
3029         if (nla == NULL)
3030                 return ERR_PTR(-EINVAL);
3031
3032         type = __nft_expr_type_get(family, nla);
3033         if (type != NULL && try_module_get(type->owner))
3034                 return type;
3035
3036         lockdep_nfnl_nft_mutex_not_held();
3037 #ifdef CONFIG_MODULES
3038         if (type == NULL) {
3039                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3040                         return ERR_PTR(-EAGAIN);
3041
3042                 if (nft_request_module(net, "nft-expr-%.*s",
3043                                        nla_len(nla),
3044                                        (char *)nla_data(nla)) == -EAGAIN)
3045                         return ERR_PTR(-EAGAIN);
3046         }
3047 #endif
3048         return ERR_PTR(-ENOENT);
3049 }
3050
3051 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3052         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
3053                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
3054         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
3055 };
3056
3057 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3058                                     const struct nft_expr *expr, bool reset)
3059 {
3060         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3061                 goto nla_put_failure;
3062
3063         if (expr->ops->dump) {
3064                 struct nlattr *data = nla_nest_start_noflag(skb,
3065                                                             NFTA_EXPR_DATA);
3066                 if (data == NULL)
3067                         goto nla_put_failure;
3068                 if (expr->ops->dump(skb, expr, reset) < 0)
3069                         goto nla_put_failure;
3070                 nla_nest_end(skb, data);
3071         }
3072
3073         return skb->len;
3074
3075 nla_put_failure:
3076         return -1;
3077 };
3078
3079 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3080                   const struct nft_expr *expr, bool reset)
3081 {
3082         struct nlattr *nest;
3083
3084         nest = nla_nest_start_noflag(skb, attr);
3085         if (!nest)
3086                 goto nla_put_failure;
3087         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3088                 goto nla_put_failure;
3089         nla_nest_end(skb, nest);
3090         return 0;
3091
3092 nla_put_failure:
3093         return -1;
3094 }
3095
3096 struct nft_expr_info {
3097         const struct nft_expr_ops       *ops;
3098         const struct nlattr             *attr;
3099         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
3100 };
3101
3102 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3103                                 const struct nlattr *nla,
3104                                 struct nft_expr_info *info)
3105 {
3106         const struct nft_expr_type *type;
3107         const struct nft_expr_ops *ops;
3108         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3109         int err;
3110
3111         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3112                                           nft_expr_policy, NULL);
3113         if (err < 0)
3114                 return err;
3115
3116         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3117         if (IS_ERR(type))
3118                 return PTR_ERR(type);
3119
3120         if (tb[NFTA_EXPR_DATA]) {
3121                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3122                                                   tb[NFTA_EXPR_DATA],
3123                                                   type->policy, NULL);
3124                 if (err < 0)
3125                         goto err1;
3126         } else
3127                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3128
3129         if (type->select_ops != NULL) {
3130                 ops = type->select_ops(ctx,
3131                                        (const struct nlattr * const *)info->tb);
3132                 if (IS_ERR(ops)) {
3133                         err = PTR_ERR(ops);
3134 #ifdef CONFIG_MODULES
3135                         if (err == -EAGAIN)
3136                                 if (nft_expr_type_request_module(ctx->net,
3137                                                                  ctx->family,
3138                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
3139                                         err = -ENOENT;
3140 #endif
3141                         goto err1;
3142                 }
3143         } else
3144                 ops = type->ops;
3145
3146         info->attr = nla;
3147         info->ops = ops;
3148
3149         return 0;
3150
3151 err1:
3152         module_put(type->owner);
3153         return err;
3154 }
3155
3156 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3157                          struct nft_expr_info *info)
3158 {
3159         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3160         const struct nft_expr_type *type;
3161         int err;
3162
3163         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3164                                           nft_expr_policy, NULL);
3165         if (err < 0)
3166                 return err;
3167
3168         if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3169                 return -EINVAL;
3170
3171         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3172         if (!type)
3173                 return -ENOENT;
3174
3175         if (!type->inner_ops)
3176                 return -EOPNOTSUPP;
3177
3178         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3179                                           tb[NFTA_EXPR_DATA],
3180                                           type->policy, NULL);
3181         if (err < 0)
3182                 goto err_nla_parse;
3183
3184         info->attr = nla;
3185         info->ops = type->inner_ops;
3186
3187         return 0;
3188
3189 err_nla_parse:
3190         return err;
3191 }
3192
3193 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3194                              const struct nft_expr_info *expr_info,
3195                              struct nft_expr *expr)
3196 {
3197         const struct nft_expr_ops *ops = expr_info->ops;
3198         int err;
3199
3200         expr->ops = ops;
3201         if (ops->init) {
3202                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3203                 if (err < 0)
3204                         goto err1;
3205         }
3206
3207         return 0;
3208 err1:
3209         expr->ops = NULL;
3210         return err;
3211 }
3212
3213 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3214                                    struct nft_expr *expr)
3215 {
3216         const struct nft_expr_type *type = expr->ops->type;
3217
3218         if (expr->ops->destroy)
3219                 expr->ops->destroy(ctx, expr);
3220         module_put(type->owner);
3221 }
3222
3223 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3224                                       const struct nlattr *nla)
3225 {
3226         struct nft_expr_info expr_info;
3227         struct nft_expr *expr;
3228         struct module *owner;
3229         int err;
3230
3231         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3232         if (err < 0)
3233                 goto err_expr_parse;
3234
3235         err = -EOPNOTSUPP;
3236         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3237                 goto err_expr_stateful;
3238
3239         err = -ENOMEM;
3240         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3241         if (expr == NULL)
3242                 goto err_expr_stateful;
3243
3244         err = nf_tables_newexpr(ctx, &expr_info, expr);
3245         if (err < 0)
3246                 goto err_expr_new;
3247
3248         return expr;
3249 err_expr_new:
3250         kfree(expr);
3251 err_expr_stateful:
3252         owner = expr_info.ops->type->owner;
3253         if (expr_info.ops->type->release_ops)
3254                 expr_info.ops->type->release_ops(expr_info.ops);
3255
3256         module_put(owner);
3257 err_expr_parse:
3258         return ERR_PTR(err);
3259 }
3260
3261 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3262 {
3263         int err;
3264
3265         if (src->ops->clone) {
3266                 dst->ops = src->ops;
3267                 err = src->ops->clone(dst, src);
3268                 if (err < 0)
3269                         return err;
3270         } else {
3271                 memcpy(dst, src, src->ops->size);
3272         }
3273
3274         __module_get(src->ops->type->owner);
3275
3276         return 0;
3277 }
3278
3279 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3280 {
3281         nf_tables_expr_destroy(ctx, expr);
3282         kfree(expr);
3283 }
3284
3285 /*
3286  * Rules
3287  */
3288
3289 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3290                                           u64 handle)
3291 {
3292         struct nft_rule *rule;
3293
3294         // FIXME: this sucks
3295         list_for_each_entry_rcu(rule, &chain->rules, list) {
3296                 if (handle == rule->handle)
3297                         return rule;
3298         }
3299
3300         return ERR_PTR(-ENOENT);
3301 }
3302
3303 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3304                                         const struct nlattr *nla)
3305 {
3306         if (nla == NULL)
3307                 return ERR_PTR(-EINVAL);
3308
3309         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3310 }
3311
3312 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3313         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3314                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3315         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3316                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3317         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3318         [NFTA_RULE_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
3319         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3320         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3321         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3322                                     .len = NFT_USERDATA_MAXLEN },
3323         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3324         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3325         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3326 };
3327
3328 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3329                                     u32 portid, u32 seq, int event,
3330                                     u32 flags, int family,
3331                                     const struct nft_table *table,
3332                                     const struct nft_chain *chain,
3333                                     const struct nft_rule *rule, u64 handle,
3334                                     bool reset)
3335 {
3336         struct nlmsghdr *nlh;
3337         const struct nft_expr *expr, *next;
3338         struct nlattr *list;
3339         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3340
3341         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3342                            nft_base_seq(net));
3343         if (!nlh)
3344                 goto nla_put_failure;
3345
3346         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3347                 goto nla_put_failure;
3348         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3349                 goto nla_put_failure;
3350         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3351                          NFTA_RULE_PAD))
3352                 goto nla_put_failure;
3353
3354         if (event != NFT_MSG_DELRULE && handle) {
3355                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3356                                  NFTA_RULE_PAD))
3357                         goto nla_put_failure;
3358         }
3359
3360         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3361                 nft_flow_rule_stats(chain, rule);
3362
3363         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3364         if (list == NULL)
3365                 goto nla_put_failure;
3366         nft_rule_for_each_expr(expr, next, rule) {
3367                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3368                         goto nla_put_failure;
3369         }
3370         nla_nest_end(skb, list);
3371
3372         if (rule->udata) {
3373                 struct nft_userdata *udata = nft_userdata(rule);
3374                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3375                             udata->data) < 0)
3376                         goto nla_put_failure;
3377         }
3378
3379         nlmsg_end(skb, nlh);
3380         return 0;
3381
3382 nla_put_failure:
3383         nlmsg_trim(skb, nlh);
3384         return -1;
3385 }
3386
3387 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3388                                   const struct nft_rule *rule, int event)
3389 {
3390         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3391         const struct nft_rule *prule;
3392         struct sk_buff *skb;
3393         u64 handle = 0;
3394         u16 flags = 0;
3395         int err;
3396
3397         if (!ctx->report &&
3398             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3399                 return;
3400
3401         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3402         if (skb == NULL)
3403                 goto err;
3404
3405         if (event == NFT_MSG_NEWRULE &&
3406             !list_is_first(&rule->list, &ctx->chain->rules) &&
3407             !list_is_last(&rule->list, &ctx->chain->rules)) {
3408                 prule = list_prev_entry(rule, list);
3409                 handle = prule->handle;
3410         }
3411         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3412                 flags |= NLM_F_APPEND;
3413         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3414                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3415
3416         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3417                                        event, flags, ctx->family, ctx->table,
3418                                        ctx->chain, rule, handle, false);
3419         if (err < 0) {
3420                 kfree_skb(skb);
3421                 goto err;
3422         }
3423
3424         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3425         return;
3426 err:
3427         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3428 }
3429
3430 static void audit_log_rule_reset(const struct nft_table *table,
3431                                  unsigned int base_seq,
3432                                  unsigned int nentries)
3433 {
3434         char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3435                               table->name, base_seq);
3436
3437         audit_log_nfcfg(buf, table->family, nentries,
3438                         AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3439         kfree(buf);
3440 }
3441
3442 struct nft_rule_dump_ctx {
3443         unsigned int s_idx;
3444         char *table;
3445         char *chain;
3446         bool reset;
3447 };
3448
3449 static int __nf_tables_dump_rules(struct sk_buff *skb,
3450                                   unsigned int *idx,
3451                                   struct netlink_callback *cb,
3452                                   const struct nft_table *table,
3453                                   const struct nft_chain *chain)
3454 {
3455         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3456         struct net *net = sock_net(skb->sk);
3457         const struct nft_rule *rule, *prule;
3458         unsigned int entries = 0;
3459         int ret = 0;
3460         u64 handle;
3461
3462         prule = NULL;
3463         list_for_each_entry_rcu(rule, &chain->rules, list) {
3464                 if (!nft_is_active(net, rule))
3465                         goto cont_skip;
3466                 if (*idx < ctx->s_idx)
3467                         goto cont;
3468                 if (prule)
3469                         handle = prule->handle;
3470                 else
3471                         handle = 0;
3472
3473                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3474                                         cb->nlh->nlmsg_seq,
3475                                         NFT_MSG_NEWRULE,
3476                                         NLM_F_MULTI | NLM_F_APPEND,
3477                                         table->family,
3478                                         table, chain, rule, handle, ctx->reset) < 0) {
3479                         ret = 1;
3480                         break;
3481                 }
3482                 entries++;
3483                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3484 cont:
3485                 prule = rule;
3486 cont_skip:
3487                 (*idx)++;
3488         }
3489
3490         if (ctx->reset && entries)
3491                 audit_log_rule_reset(table, cb->seq, entries);
3492
3493         return ret;
3494 }
3495
3496 static int nf_tables_dump_rules(struct sk_buff *skb,
3497                                 struct netlink_callback *cb)
3498 {
3499         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3500         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3501         struct nft_table *table;
3502         const struct nft_chain *chain;
3503         unsigned int idx = 0;
3504         struct net *net = sock_net(skb->sk);
3505         int family = nfmsg->nfgen_family;
3506         struct nftables_pernet *nft_net;
3507
3508         rcu_read_lock();
3509         nft_net = nft_pernet(net);
3510         cb->seq = READ_ONCE(nft_net->base_seq);
3511
3512         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3513                 if (family != NFPROTO_UNSPEC && family != table->family)
3514                         continue;
3515
3516                 if (ctx->table && strcmp(ctx->table, table->name) != 0)
3517                         continue;
3518
3519                 if (ctx->table && ctx->chain) {
3520                         struct rhlist_head *list, *tmp;
3521
3522                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3523                                                nft_chain_ht_params);
3524                         if (!list)
3525                                 goto done;
3526
3527                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3528                                 if (!nft_is_active(net, chain))
3529                                         continue;
3530                                 __nf_tables_dump_rules(skb, &idx,
3531                                                        cb, table, chain);
3532                                 break;
3533                         }
3534                         goto done;
3535                 }
3536
3537                 list_for_each_entry_rcu(chain, &table->chains, list) {
3538                         if (__nf_tables_dump_rules(skb, &idx,
3539                                                    cb, table, chain))
3540                                 goto done;
3541                 }
3542
3543                 if (ctx->table)
3544                         break;
3545         }
3546 done:
3547         rcu_read_unlock();
3548
3549         ctx->s_idx = idx;
3550         return skb->len;
3551 }
3552
3553 static int nf_tables_dumpreset_rules(struct sk_buff *skb,
3554                                      struct netlink_callback *cb)
3555 {
3556         struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
3557         int ret;
3558
3559         /* Mutex is held is to prevent that two concurrent dump-and-reset calls
3560          * do not underrun counters and quotas. The commit_mutex is used for
3561          * the lack a better lock, this is not transaction path.
3562          */
3563         mutex_lock(&nft_net->commit_mutex);
3564         ret = nf_tables_dump_rules(skb, cb);
3565         mutex_unlock(&nft_net->commit_mutex);
3566
3567         return ret;
3568 }
3569
3570 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3571 {
3572         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3573         const struct nlattr * const *nla = cb->data;
3574
3575         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
3576
3577         if (nla[NFTA_RULE_TABLE]) {
3578                 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], GFP_ATOMIC);
3579                 if (!ctx->table)
3580                         return -ENOMEM;
3581         }
3582         if (nla[NFTA_RULE_CHAIN]) {
3583                 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], GFP_ATOMIC);
3584                 if (!ctx->chain) {
3585                         kfree(ctx->table);
3586                         return -ENOMEM;
3587                 }
3588         }
3589         return 0;
3590 }
3591
3592 static int nf_tables_dumpreset_rules_start(struct netlink_callback *cb)
3593 {
3594         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3595
3596         ctx->reset = true;
3597
3598         return nf_tables_dump_rules_start(cb);
3599 }
3600
3601 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3602 {
3603         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3604
3605         kfree(ctx->table);
3606         kfree(ctx->chain);
3607         return 0;
3608 }
3609
3610 /* called with rcu_read_lock held */
3611 static struct sk_buff *
3612 nf_tables_getrule_single(u32 portid, const struct nfnl_info *info,
3613                          const struct nlattr * const nla[], bool reset)
3614 {
3615         struct netlink_ext_ack *extack = info->extack;
3616         u8 genmask = nft_genmask_cur(info->net);
3617         u8 family = info->nfmsg->nfgen_family;
3618         const struct nft_chain *chain;
3619         const struct nft_rule *rule;
3620         struct net *net = info->net;
3621         struct nft_table *table;
3622         struct sk_buff *skb2;
3623         int err;
3624
3625         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3626         if (IS_ERR(table)) {
3627                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3628                 return ERR_CAST(table);
3629         }
3630
3631         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3632         if (IS_ERR(chain)) {
3633                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3634                 return ERR_CAST(chain);
3635         }
3636
3637         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3638         if (IS_ERR(rule)) {
3639                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3640                 return ERR_CAST(rule);
3641         }
3642
3643         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3644         if (!skb2)
3645                 return ERR_PTR(-ENOMEM);
3646
3647         err = nf_tables_fill_rule_info(skb2, net, portid,
3648                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3649                                        family, table, chain, rule, 0, reset);
3650         if (err < 0) {
3651                 kfree_skb(skb2);
3652                 return ERR_PTR(err);
3653         }
3654
3655         return skb2;
3656 }
3657
3658 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3659                              const struct nlattr * const nla[])
3660 {
3661         u32 portid = NETLINK_CB(skb).portid;
3662         struct net *net = info->net;
3663         struct sk_buff *skb2;
3664
3665         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3666                 struct netlink_dump_control c = {
3667                         .start= nf_tables_dump_rules_start,
3668                         .dump = nf_tables_dump_rules,
3669                         .done = nf_tables_dump_rules_done,
3670                         .module = THIS_MODULE,
3671                         .data = (void *)nla,
3672                 };
3673
3674                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3675         }
3676
3677         skb2 = nf_tables_getrule_single(portid, info, nla, false);
3678         if (IS_ERR(skb2))
3679                 return PTR_ERR(skb2);
3680
3681         return nfnetlink_unicast(skb2, net, portid);
3682 }
3683
3684 static int nf_tables_getrule_reset(struct sk_buff *skb,
3685                                    const struct nfnl_info *info,
3686                                    const struct nlattr * const nla[])
3687 {
3688         struct nftables_pernet *nft_net = nft_pernet(info->net);
3689         u32 portid = NETLINK_CB(skb).portid;
3690         struct net *net = info->net;
3691         struct sk_buff *skb2;
3692         char *buf;
3693
3694         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3695                 struct netlink_dump_control c = {
3696                         .start= nf_tables_dumpreset_rules_start,
3697                         .dump = nf_tables_dumpreset_rules,
3698                         .done = nf_tables_dump_rules_done,
3699                         .module = THIS_MODULE,
3700                         .data = (void *)nla,
3701                 };
3702
3703                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3704         }
3705
3706         if (!try_module_get(THIS_MODULE))
3707                 return -EINVAL;
3708         rcu_read_unlock();
3709         mutex_lock(&nft_net->commit_mutex);
3710         skb2 = nf_tables_getrule_single(portid, info, nla, true);
3711         mutex_unlock(&nft_net->commit_mutex);
3712         rcu_read_lock();
3713         module_put(THIS_MODULE);
3714
3715         if (IS_ERR(skb2))
3716                 return PTR_ERR(skb2);
3717
3718         buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
3719                         nla_len(nla[NFTA_RULE_TABLE]),
3720                         (char *)nla_data(nla[NFTA_RULE_TABLE]),
3721                         nft_net->base_seq);
3722         audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
3723                         AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3724         kfree(buf);
3725
3726         return nfnetlink_unicast(skb2, net, portid);
3727 }
3728
3729 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3730 {
3731         struct nft_expr *expr, *next;
3732
3733         /*
3734          * Careful: some expressions might not be initialized in case this
3735          * is called on error from nf_tables_newrule().
3736          */
3737         expr = nft_expr_first(rule);
3738         while (nft_expr_more(rule, expr)) {
3739                 next = nft_expr_next(expr);
3740                 nf_tables_expr_destroy(ctx, expr);
3741                 expr = next;
3742         }
3743         kfree(rule);
3744 }
3745
3746 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3747 {
3748         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3749         nf_tables_rule_destroy(ctx, rule);
3750 }
3751
3752 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3753 {
3754         struct nft_expr *expr, *last;
3755         const struct nft_data *data;
3756         struct nft_rule *rule;
3757         int err;
3758
3759         if (ctx->level == NFT_JUMP_STACK_SIZE)
3760                 return -EMLINK;
3761
3762         list_for_each_entry(rule, &chain->rules, list) {
3763                 if (fatal_signal_pending(current))
3764                         return -EINTR;
3765
3766                 if (!nft_is_active_next(ctx->net, rule))
3767                         continue;
3768
3769                 nft_rule_for_each_expr(expr, last, rule) {
3770                         if (!expr->ops->validate)
3771                                 continue;
3772
3773                         err = expr->ops->validate(ctx, expr, &data);
3774                         if (err < 0)
3775                                 return err;
3776                 }
3777         }
3778
3779         return 0;
3780 }
3781 EXPORT_SYMBOL_GPL(nft_chain_validate);
3782
3783 static int nft_table_validate(struct net *net, const struct nft_table *table)
3784 {
3785         struct nft_chain *chain;
3786         struct nft_ctx ctx = {
3787                 .net    = net,
3788                 .family = table->family,
3789         };
3790         int err;
3791
3792         list_for_each_entry(chain, &table->chains, list) {
3793                 if (!nft_is_base_chain(chain))
3794                         continue;
3795
3796                 ctx.chain = chain;
3797                 err = nft_chain_validate(&ctx, chain);
3798                 if (err < 0)
3799                         return err;
3800
3801                 cond_resched();
3802         }
3803
3804         return 0;
3805 }
3806
3807 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3808                          const struct nft_set_iter *iter,
3809                          struct nft_elem_priv *elem_priv)
3810 {
3811         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
3812         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3813         const struct nft_data *data;
3814         int err;
3815
3816         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3817             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3818                 return 0;
3819
3820         data = nft_set_ext_data(ext);
3821         switch (data->verdict.code) {
3822         case NFT_JUMP:
3823         case NFT_GOTO:
3824                 pctx->level++;
3825                 err = nft_chain_validate(ctx, data->verdict.chain);
3826                 if (err < 0)
3827                         return err;
3828                 pctx->level--;
3829                 break;
3830         default:
3831                 break;
3832         }
3833
3834         return 0;
3835 }
3836
3837 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3838 {
3839         u8 genmask = nft_genmask_next(ctx->net);
3840         struct nft_set_elem_catchall *catchall;
3841         struct nft_set_ext *ext;
3842         int ret = 0;
3843
3844         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3845                 ext = nft_set_elem_ext(set, catchall->elem);
3846                 if (!nft_set_elem_active(ext, genmask))
3847                         continue;
3848
3849                 ret = nft_setelem_validate(ctx, set, NULL, catchall->elem);
3850                 if (ret < 0)
3851                         return ret;
3852         }
3853
3854         return ret;
3855 }
3856
3857 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3858                                              const struct nft_chain *chain,
3859                                              const struct nlattr *nla);
3860
3861 #define NFT_RULE_MAXEXPRS       128
3862
3863 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3864                              const struct nlattr * const nla[])
3865 {
3866         struct nftables_pernet *nft_net = nft_pernet(info->net);
3867         struct netlink_ext_ack *extack = info->extack;
3868         unsigned int size, i, n, ulen = 0, usize = 0;
3869         u8 genmask = nft_genmask_next(info->net);
3870         struct nft_rule *rule, *old_rule = NULL;
3871         struct nft_expr_info *expr_info = NULL;
3872         u8 family = info->nfmsg->nfgen_family;
3873         struct nft_flow_rule *flow = NULL;
3874         struct net *net = info->net;
3875         struct nft_userdata *udata;
3876         struct nft_table *table;
3877         struct nft_chain *chain;
3878         struct nft_trans *trans;
3879         u64 handle, pos_handle;
3880         struct nft_expr *expr;
3881         struct nft_ctx ctx;
3882         struct nlattr *tmp;
3883         int err, rem;
3884
3885         lockdep_assert_held(&nft_net->commit_mutex);
3886
3887         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3888                                  NETLINK_CB(skb).portid);
3889         if (IS_ERR(table)) {
3890                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3891                 return PTR_ERR(table);
3892         }
3893
3894         if (nla[NFTA_RULE_CHAIN]) {
3895                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3896                                          genmask);
3897                 if (IS_ERR(chain)) {
3898                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3899                         return PTR_ERR(chain);
3900                 }
3901
3902         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3903                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3904                                               genmask);
3905                 if (IS_ERR(chain)) {
3906                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3907                         return PTR_ERR(chain);
3908                 }
3909         } else {
3910                 return -EINVAL;
3911         }
3912
3913         if (nft_chain_is_bound(chain))
3914                 return -EOPNOTSUPP;
3915
3916         if (nla[NFTA_RULE_HANDLE]) {
3917                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3918                 rule = __nft_rule_lookup(chain, handle);
3919                 if (IS_ERR(rule)) {
3920                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3921                         return PTR_ERR(rule);
3922                 }
3923
3924                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3925                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3926                         return -EEXIST;
3927                 }
3928                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3929                         old_rule = rule;
3930                 else
3931                         return -EOPNOTSUPP;
3932         } else {
3933                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3934                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3935                         return -EINVAL;
3936                 handle = nf_tables_alloc_handle(table);
3937
3938                 if (nla[NFTA_RULE_POSITION]) {
3939                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3940                         old_rule = __nft_rule_lookup(chain, pos_handle);
3941                         if (IS_ERR(old_rule)) {
3942                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3943                                 return PTR_ERR(old_rule);
3944                         }
3945                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3946                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3947                         if (IS_ERR(old_rule)) {
3948                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3949                                 return PTR_ERR(old_rule);
3950                         }
3951                 }
3952         }
3953
3954         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3955
3956         n = 0;
3957         size = 0;
3958         if (nla[NFTA_RULE_EXPRESSIONS]) {
3959                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3960                                            sizeof(struct nft_expr_info),
3961                                            GFP_KERNEL);
3962                 if (!expr_info)
3963                         return -ENOMEM;
3964
3965                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3966                         err = -EINVAL;
3967                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3968                                 goto err_release_expr;
3969                         if (n == NFT_RULE_MAXEXPRS)
3970                                 goto err_release_expr;
3971                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3972                         if (err < 0) {
3973                                 NL_SET_BAD_ATTR(extack, tmp);
3974                                 goto err_release_expr;
3975                         }
3976                         size += expr_info[n].ops->size;
3977                         n++;
3978                 }
3979         }
3980         /* Check for overflow of dlen field */
3981         err = -EFBIG;
3982         if (size >= 1 << 12)
3983                 goto err_release_expr;
3984
3985         if (nla[NFTA_RULE_USERDATA]) {
3986                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3987                 if (ulen > 0)
3988                         usize = sizeof(struct nft_userdata) + ulen;
3989         }
3990
3991         err = -ENOMEM;
3992         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3993         if (rule == NULL)
3994                 goto err_release_expr;
3995
3996         nft_activate_next(net, rule);
3997
3998         rule->handle = handle;
3999         rule->dlen   = size;
4000         rule->udata  = ulen ? 1 : 0;
4001
4002         if (ulen) {
4003                 udata = nft_userdata(rule);
4004                 udata->len = ulen - 1;
4005                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
4006         }
4007
4008         expr = nft_expr_first(rule);
4009         for (i = 0; i < n; i++) {
4010                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
4011                 if (err < 0) {
4012                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
4013                         goto err_release_rule;
4014                 }
4015
4016                 if (expr_info[i].ops->validate)
4017                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
4018
4019                 expr_info[i].ops = NULL;
4020                 expr = nft_expr_next(expr);
4021         }
4022
4023         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
4024                 flow = nft_flow_rule_create(net, rule);
4025                 if (IS_ERR(flow)) {
4026                         err = PTR_ERR(flow);
4027                         goto err_release_rule;
4028                 }
4029         }
4030
4031         if (!nft_use_inc(&chain->use)) {
4032                 err = -EMFILE;
4033                 goto err_release_rule;
4034         }
4035
4036         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
4037                 if (nft_chain_binding(chain)) {
4038                         err = -EOPNOTSUPP;
4039                         goto err_destroy_flow_rule;
4040                 }
4041
4042                 err = nft_delrule(&ctx, old_rule);
4043                 if (err < 0)
4044                         goto err_destroy_flow_rule;
4045
4046                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4047                 if (trans == NULL) {
4048                         err = -ENOMEM;
4049                         goto err_destroy_flow_rule;
4050                 }
4051                 list_add_tail_rcu(&rule->list, &old_rule->list);
4052         } else {
4053                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4054                 if (!trans) {
4055                         err = -ENOMEM;
4056                         goto err_destroy_flow_rule;
4057                 }
4058
4059                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4060                         if (old_rule)
4061                                 list_add_rcu(&rule->list, &old_rule->list);
4062                         else
4063                                 list_add_tail_rcu(&rule->list, &chain->rules);
4064                  } else {
4065                         if (old_rule)
4066                                 list_add_tail_rcu(&rule->list, &old_rule->list);
4067                         else
4068                                 list_add_rcu(&rule->list, &chain->rules);
4069                 }
4070         }
4071         kvfree(expr_info);
4072
4073         if (flow)
4074                 nft_trans_flow_rule(trans) = flow;
4075
4076         if (table->validate_state == NFT_VALIDATE_DO)
4077                 return nft_table_validate(net, table);
4078
4079         return 0;
4080
4081 err_destroy_flow_rule:
4082         nft_use_dec_restore(&chain->use);
4083         if (flow)
4084                 nft_flow_rule_destroy(flow);
4085 err_release_rule:
4086         nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4087         nf_tables_rule_destroy(&ctx, rule);
4088 err_release_expr:
4089         for (i = 0; i < n; i++) {
4090                 if (expr_info[i].ops) {
4091                         module_put(expr_info[i].ops->type->owner);
4092                         if (expr_info[i].ops->type->release_ops)
4093                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4094                 }
4095         }
4096         kvfree(expr_info);
4097
4098         return err;
4099 }
4100
4101 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4102                                              const struct nft_chain *chain,
4103                                              const struct nlattr *nla)
4104 {
4105         struct nftables_pernet *nft_net = nft_pernet(net);
4106         u32 id = ntohl(nla_get_be32(nla));
4107         struct nft_trans *trans;
4108
4109         list_for_each_entry(trans, &nft_net->commit_list, list) {
4110                 if (trans->msg_type == NFT_MSG_NEWRULE &&
4111                     trans->ctx.chain == chain &&
4112                     id == nft_trans_rule_id(trans))
4113                         return nft_trans_rule(trans);
4114         }
4115         return ERR_PTR(-ENOENT);
4116 }
4117
4118 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4119                              const struct nlattr * const nla[])
4120 {
4121         struct netlink_ext_ack *extack = info->extack;
4122         u8 genmask = nft_genmask_next(info->net);
4123         u8 family = info->nfmsg->nfgen_family;
4124         struct nft_chain *chain = NULL;
4125         struct net *net = info->net;
4126         struct nft_table *table;
4127         struct nft_rule *rule;
4128         struct nft_ctx ctx;
4129         int err = 0;
4130
4131         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4132                                  NETLINK_CB(skb).portid);
4133         if (IS_ERR(table)) {
4134                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4135                 return PTR_ERR(table);
4136         }
4137
4138         if (nla[NFTA_RULE_CHAIN]) {
4139                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4140                                          genmask);
4141                 if (IS_ERR(chain)) {
4142                         if (PTR_ERR(chain) == -ENOENT &&
4143                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4144                                 return 0;
4145
4146                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4147                         return PTR_ERR(chain);
4148                 }
4149                 if (nft_chain_binding(chain))
4150                         return -EOPNOTSUPP;
4151         }
4152
4153         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4154
4155         if (chain) {
4156                 if (nla[NFTA_RULE_HANDLE]) {
4157                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4158                         if (IS_ERR(rule)) {
4159                                 if (PTR_ERR(rule) == -ENOENT &&
4160                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4161                                         return 0;
4162
4163                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4164                                 return PTR_ERR(rule);
4165                         }
4166
4167                         err = nft_delrule(&ctx, rule);
4168                 } else if (nla[NFTA_RULE_ID]) {
4169                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4170                         if (IS_ERR(rule)) {
4171                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4172                                 return PTR_ERR(rule);
4173                         }
4174
4175                         err = nft_delrule(&ctx, rule);
4176                 } else {
4177                         err = nft_delrule_by_chain(&ctx);
4178                 }
4179         } else {
4180                 list_for_each_entry(chain, &table->chains, list) {
4181                         if (!nft_is_active_next(net, chain))
4182                                 continue;
4183                         if (nft_chain_binding(chain))
4184                                 continue;
4185
4186                         ctx.chain = chain;
4187                         err = nft_delrule_by_chain(&ctx);
4188                         if (err < 0)
4189                                 break;
4190                 }
4191         }
4192
4193         return err;
4194 }
4195
4196 /*
4197  * Sets
4198  */
4199 static const struct nft_set_type *nft_set_types[] = {
4200         &nft_set_hash_fast_type,
4201         &nft_set_hash_type,
4202         &nft_set_rhash_type,
4203         &nft_set_bitmap_type,
4204         &nft_set_rbtree_type,
4205 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4206         &nft_set_pipapo_avx2_type,
4207 #endif
4208         &nft_set_pipapo_type,
4209 };
4210
4211 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
4212                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4213                                  NFT_SET_EVAL)
4214
4215 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4216 {
4217         return (flags & type->features) == (flags & NFT_SET_FEATURES);
4218 }
4219
4220 /*
4221  * Select a set implementation based on the data characteristics and the
4222  * given policy. The total memory use might not be known if no size is
4223  * given, in that case the amount of memory per element is used.
4224  */
4225 static const struct nft_set_ops *
4226 nft_select_set_ops(const struct nft_ctx *ctx,
4227                    const struct nlattr * const nla[],
4228                    const struct nft_set_desc *desc)
4229 {
4230         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4231         const struct nft_set_ops *ops, *bops;
4232         struct nft_set_estimate est, best;
4233         const struct nft_set_type *type;
4234         u32 flags = 0;
4235         int i;
4236
4237         lockdep_assert_held(&nft_net->commit_mutex);
4238         lockdep_nfnl_nft_mutex_not_held();
4239
4240         if (nla[NFTA_SET_FLAGS] != NULL)
4241                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4242
4243         bops        = NULL;
4244         best.size   = ~0;
4245         best.lookup = ~0;
4246         best.space  = ~0;
4247
4248         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4249                 type = nft_set_types[i];
4250                 ops = &type->ops;
4251
4252                 if (!nft_set_ops_candidate(type, flags))
4253                         continue;
4254                 if (!ops->estimate(desc, flags, &est))
4255                         continue;
4256
4257                 switch (desc->policy) {
4258                 case NFT_SET_POL_PERFORMANCE:
4259                         if (est.lookup < best.lookup)
4260                                 break;
4261                         if (est.lookup == best.lookup &&
4262                             est.space < best.space)
4263                                 break;
4264                         continue;
4265                 case NFT_SET_POL_MEMORY:
4266                         if (!desc->size) {
4267                                 if (est.space < best.space)
4268                                         break;
4269                                 if (est.space == best.space &&
4270                                     est.lookup < best.lookup)
4271                                         break;
4272                         } else if (est.size < best.size || !bops) {
4273                                 break;
4274                         }
4275                         continue;
4276                 default:
4277                         break;
4278                 }
4279
4280                 bops = ops;
4281                 best = est;
4282         }
4283
4284         if (bops != NULL)
4285                 return bops;
4286
4287         return ERR_PTR(-EOPNOTSUPP);
4288 }
4289
4290 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4291         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4292                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4293         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4294                                             .len = NFT_SET_MAXNAMELEN - 1 },
4295         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4296         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4297         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4298         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4299         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4300         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4301         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4302         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4303         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4304         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4305         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4306                                             .len  = NFT_USERDATA_MAXLEN },
4307         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4308         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4309         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4310         [NFTA_SET_EXPRESSIONS]          = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
4311 };
4312
4313 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4314         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4315 };
4316
4317 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4318         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4319         [NFTA_SET_DESC_CONCAT]          = NLA_POLICY_NESTED_ARRAY(nft_concat_policy),
4320 };
4321
4322 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4323                                       const struct nlattr *nla, u8 genmask)
4324 {
4325         struct nft_set *set;
4326
4327         if (nla == NULL)
4328                 return ERR_PTR(-EINVAL);
4329
4330         list_for_each_entry_rcu(set, &table->sets, list) {
4331                 if (!nla_strcmp(nla, set->name) &&
4332                     nft_active_genmask(set, genmask))
4333                         return set;
4334         }
4335         return ERR_PTR(-ENOENT);
4336 }
4337
4338 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4339                                                const struct nlattr *nla,
4340                                                u8 genmask)
4341 {
4342         struct nft_set *set;
4343
4344         list_for_each_entry(set, &table->sets, list) {
4345                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4346                     nft_active_genmask(set, genmask))
4347                         return set;
4348         }
4349         return ERR_PTR(-ENOENT);
4350 }
4351
4352 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4353                                            const struct nft_table *table,
4354                                            const struct nlattr *nla, u8 genmask)
4355 {
4356         struct nftables_pernet *nft_net = nft_pernet(net);
4357         u32 id = ntohl(nla_get_be32(nla));
4358         struct nft_trans *trans;
4359
4360         list_for_each_entry(trans, &nft_net->commit_list, list) {
4361                 if (trans->msg_type == NFT_MSG_NEWSET) {
4362                         struct nft_set *set = nft_trans_set(trans);
4363
4364                         if (id == nft_trans_set_id(trans) &&
4365                             set->table == table &&
4366                             nft_active_genmask(set, genmask))
4367                                 return set;
4368                 }
4369         }
4370         return ERR_PTR(-ENOENT);
4371 }
4372
4373 struct nft_set *nft_set_lookup_global(const struct net *net,
4374                                       const struct nft_table *table,
4375                                       const struct nlattr *nla_set_name,
4376                                       const struct nlattr *nla_set_id,
4377                                       u8 genmask)
4378 {
4379         struct nft_set *set;
4380
4381         set = nft_set_lookup(table, nla_set_name, genmask);
4382         if (IS_ERR(set)) {
4383                 if (!nla_set_id)
4384                         return set;
4385
4386                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4387         }
4388         return set;
4389 }
4390 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4391
4392 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4393                                     const char *name)
4394 {
4395         const struct nft_set *i;
4396         const char *p;
4397         unsigned long *inuse;
4398         unsigned int n = 0, min = 0;
4399
4400         p = strchr(name, '%');
4401         if (p != NULL) {
4402                 if (p[1] != 'd' || strchr(p + 2, '%'))
4403                         return -EINVAL;
4404
4405                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4406                 if (inuse == NULL)
4407                         return -ENOMEM;
4408 cont:
4409                 list_for_each_entry(i, &ctx->table->sets, list) {
4410                         int tmp;
4411
4412                         if (!nft_is_active_next(ctx->net, i))
4413                                 continue;
4414                         if (!sscanf(i->name, name, &tmp))
4415                                 continue;
4416                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4417                                 continue;
4418
4419                         set_bit(tmp - min, inuse);
4420                 }
4421
4422                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4423                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4424                         min += BITS_PER_BYTE * PAGE_SIZE;
4425                         memset(inuse, 0, PAGE_SIZE);
4426                         goto cont;
4427                 }
4428                 free_page((unsigned long)inuse);
4429         }
4430
4431         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4432         if (!set->name)
4433                 return -ENOMEM;
4434
4435         list_for_each_entry(i, &ctx->table->sets, list) {
4436                 if (!nft_is_active_next(ctx->net, i))
4437                         continue;
4438                 if (!strcmp(set->name, i->name)) {
4439                         kfree(set->name);
4440                         set->name = NULL;
4441                         return -ENFILE;
4442                 }
4443         }
4444         return 0;
4445 }
4446
4447 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4448 {
4449         u64 ms = be64_to_cpu(nla_get_be64(nla));
4450         u64 max = (u64)(~((u64)0));
4451
4452         max = div_u64(max, NSEC_PER_MSEC);
4453         if (ms >= max)
4454                 return -ERANGE;
4455
4456         ms *= NSEC_PER_MSEC;
4457         *result = nsecs_to_jiffies64(ms);
4458         return 0;
4459 }
4460
4461 __be64 nf_jiffies64_to_msecs(u64 input)
4462 {
4463         return cpu_to_be64(jiffies64_to_msecs(input));
4464 }
4465
4466 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4467                                      const struct nft_set *set)
4468 {
4469         struct nlattr *concat, *field;
4470         int i;
4471
4472         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4473         if (!concat)
4474                 return -ENOMEM;
4475
4476         for (i = 0; i < set->field_count; i++) {
4477                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4478                 if (!field)
4479                         return -ENOMEM;
4480
4481                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4482                                  htonl(set->field_len[i])))
4483                         return -ENOMEM;
4484
4485                 nla_nest_end(skb, field);
4486         }
4487
4488         nla_nest_end(skb, concat);
4489
4490         return 0;
4491 }
4492
4493 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4494                               const struct nft_set *set, u16 event, u16 flags)
4495 {
4496         u64 timeout = READ_ONCE(set->timeout);
4497         u32 gc_int = READ_ONCE(set->gc_int);
4498         u32 portid = ctx->portid;
4499         struct nlmsghdr *nlh;
4500         struct nlattr *nest;
4501         u32 seq = ctx->seq;
4502         int i;
4503
4504         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4505         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4506                            NFNETLINK_V0, nft_base_seq(ctx->net));
4507         if (!nlh)
4508                 goto nla_put_failure;
4509
4510         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4511                 goto nla_put_failure;
4512         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4513                 goto nla_put_failure;
4514         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4515                          NFTA_SET_PAD))
4516                 goto nla_put_failure;
4517
4518         if (event == NFT_MSG_DELSET) {
4519                 nlmsg_end(skb, nlh);
4520                 return 0;
4521         }
4522
4523         if (set->flags != 0)
4524                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4525                         goto nla_put_failure;
4526
4527         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4528                 goto nla_put_failure;
4529         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4530                 goto nla_put_failure;
4531         if (set->flags & NFT_SET_MAP) {
4532                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4533                         goto nla_put_failure;
4534                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4535                         goto nla_put_failure;
4536         }
4537         if (set->flags & NFT_SET_OBJECT &&
4538             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4539                 goto nla_put_failure;
4540
4541         if (timeout &&
4542             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4543                          nf_jiffies64_to_msecs(timeout),
4544                          NFTA_SET_PAD))
4545                 goto nla_put_failure;
4546         if (gc_int &&
4547             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4548                 goto nla_put_failure;
4549
4550         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4551                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4552                         goto nla_put_failure;
4553         }
4554
4555         if (set->udata &&
4556             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4557                 goto nla_put_failure;
4558
4559         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4560         if (!nest)
4561                 goto nla_put_failure;
4562         if (set->size &&
4563             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4564                 goto nla_put_failure;
4565
4566         if (set->field_count > 1 &&
4567             nf_tables_fill_set_concat(skb, set))
4568                 goto nla_put_failure;
4569
4570         nla_nest_end(skb, nest);
4571
4572         if (set->num_exprs == 1) {
4573                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4574                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4575                         goto nla_put_failure;
4576
4577                 nla_nest_end(skb, nest);
4578         } else if (set->num_exprs > 1) {
4579                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4580                 if (nest == NULL)
4581                         goto nla_put_failure;
4582
4583                 for (i = 0; i < set->num_exprs; i++) {
4584                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4585                                           set->exprs[i], false) < 0)
4586                                 goto nla_put_failure;
4587                 }
4588                 nla_nest_end(skb, nest);
4589         }
4590
4591         nlmsg_end(skb, nlh);
4592         return 0;
4593
4594 nla_put_failure:
4595         nlmsg_trim(skb, nlh);
4596         return -1;
4597 }
4598
4599 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4600                                  const struct nft_set *set, int event,
4601                                  gfp_t gfp_flags)
4602 {
4603         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4604         u32 portid = ctx->portid;
4605         struct sk_buff *skb;
4606         u16 flags = 0;
4607         int err;
4608
4609         if (!ctx->report &&
4610             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4611                 return;
4612
4613         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4614         if (skb == NULL)
4615                 goto err;
4616
4617         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4618                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4619
4620         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4621         if (err < 0) {
4622                 kfree_skb(skb);
4623                 goto err;
4624         }
4625
4626         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4627         return;
4628 err:
4629         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4630 }
4631
4632 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4633 {
4634         const struct nft_set *set;
4635         unsigned int idx, s_idx = cb->args[0];
4636         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4637         struct net *net = sock_net(skb->sk);
4638         struct nft_ctx *ctx = cb->data, ctx_set;
4639         struct nftables_pernet *nft_net;
4640
4641         if (cb->args[1])
4642                 return skb->len;
4643
4644         rcu_read_lock();
4645         nft_net = nft_pernet(net);
4646         cb->seq = READ_ONCE(nft_net->base_seq);
4647
4648         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4649                 if (ctx->family != NFPROTO_UNSPEC &&
4650                     ctx->family != table->family)
4651                         continue;
4652
4653                 if (ctx->table && ctx->table != table)
4654                         continue;
4655
4656                 if (cur_table) {
4657                         if (cur_table != table)
4658                                 continue;
4659
4660                         cur_table = NULL;
4661                 }
4662                 idx = 0;
4663                 list_for_each_entry_rcu(set, &table->sets, list) {
4664                         if (idx < s_idx)
4665                                 goto cont;
4666                         if (!nft_is_active(net, set))
4667                                 goto cont;
4668
4669                         ctx_set = *ctx;
4670                         ctx_set.table = table;
4671                         ctx_set.family = table->family;
4672
4673                         if (nf_tables_fill_set(skb, &ctx_set, set,
4674                                                NFT_MSG_NEWSET,
4675                                                NLM_F_MULTI) < 0) {
4676                                 cb->args[0] = idx;
4677                                 cb->args[2] = (unsigned long) table;
4678                                 goto done;
4679                         }
4680                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4681 cont:
4682                         idx++;
4683                 }
4684                 if (s_idx)
4685                         s_idx = 0;
4686         }
4687         cb->args[1] = 1;
4688 done:
4689         rcu_read_unlock();
4690         return skb->len;
4691 }
4692
4693 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4694 {
4695         struct nft_ctx *ctx_dump = NULL;
4696
4697         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4698         if (ctx_dump == NULL)
4699                 return -ENOMEM;
4700
4701         cb->data = ctx_dump;
4702         return 0;
4703 }
4704
4705 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4706 {
4707         kfree(cb->data);
4708         return 0;
4709 }
4710
4711 /* called with rcu_read_lock held */
4712 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4713                             const struct nlattr * const nla[])
4714 {
4715         struct netlink_ext_ack *extack = info->extack;
4716         u8 genmask = nft_genmask_cur(info->net);
4717         u8 family = info->nfmsg->nfgen_family;
4718         struct nft_table *table = NULL;
4719         struct net *net = info->net;
4720         const struct nft_set *set;
4721         struct sk_buff *skb2;
4722         struct nft_ctx ctx;
4723         int err;
4724
4725         if (nla[NFTA_SET_TABLE]) {
4726                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4727                                          genmask, 0);
4728                 if (IS_ERR(table)) {
4729                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4730                         return PTR_ERR(table);
4731                 }
4732         }
4733
4734         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4735
4736         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4737                 struct netlink_dump_control c = {
4738                         .start = nf_tables_dump_sets_start,
4739                         .dump = nf_tables_dump_sets,
4740                         .done = nf_tables_dump_sets_done,
4741                         .data = &ctx,
4742                         .module = THIS_MODULE,
4743                 };
4744
4745                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4746         }
4747
4748         /* Only accept unspec with dump */
4749         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4750                 return -EAFNOSUPPORT;
4751         if (!nla[NFTA_SET_TABLE])
4752                 return -EINVAL;
4753
4754         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4755         if (IS_ERR(set)) {
4756                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4757                 return PTR_ERR(set);
4758         }
4759
4760         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4761         if (skb2 == NULL)
4762                 return -ENOMEM;
4763
4764         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4765         if (err < 0)
4766                 goto err_fill_set_info;
4767
4768         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4769
4770 err_fill_set_info:
4771         kfree_skb(skb2);
4772         return err;
4773 }
4774
4775 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4776                                      struct nft_set_desc *desc)
4777 {
4778         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4779         u32 len;
4780         int err;
4781
4782         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4783                 return -E2BIG;
4784
4785         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4786                                           nft_concat_policy, NULL);
4787         if (err < 0)
4788                 return err;
4789
4790         if (!tb[NFTA_SET_FIELD_LEN])
4791                 return -EINVAL;
4792
4793         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4794         if (!len || len > U8_MAX)
4795                 return -EINVAL;
4796
4797         desc->field_len[desc->field_count++] = len;
4798
4799         return 0;
4800 }
4801
4802 static int nft_set_desc_concat(struct nft_set_desc *desc,
4803                                const struct nlattr *nla)
4804 {
4805         struct nlattr *attr;
4806         u32 num_regs = 0;
4807         int rem, err, i;
4808
4809         nla_for_each_nested(attr, nla, rem) {
4810                 if (nla_type(attr) != NFTA_LIST_ELEM)
4811                         return -EINVAL;
4812
4813                 err = nft_set_desc_concat_parse(attr, desc);
4814                 if (err < 0)
4815                         return err;
4816         }
4817
4818         for (i = 0; i < desc->field_count; i++)
4819                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4820
4821         if (num_regs > NFT_REG32_COUNT)
4822                 return -E2BIG;
4823
4824         return 0;
4825 }
4826
4827 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4828                                     const struct nlattr *nla)
4829 {
4830         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4831         int err;
4832
4833         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4834                                           nft_set_desc_policy, NULL);
4835         if (err < 0)
4836                 return err;
4837
4838         if (da[NFTA_SET_DESC_SIZE] != NULL)
4839                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4840         if (da[NFTA_SET_DESC_CONCAT])
4841                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4842
4843         return err;
4844 }
4845
4846 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4847                               const struct nlattr * const *nla,
4848                               struct nft_expr **exprs, int *num_exprs,
4849                               u32 flags)
4850 {
4851         struct nft_expr *expr;
4852         int err, i;
4853
4854         if (nla[NFTA_SET_EXPR]) {
4855                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4856                 if (IS_ERR(expr)) {
4857                         err = PTR_ERR(expr);
4858                         goto err_set_expr_alloc;
4859                 }
4860                 exprs[0] = expr;
4861                 (*num_exprs)++;
4862         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4863                 struct nlattr *tmp;
4864                 int left;
4865
4866                 if (!(flags & NFT_SET_EXPR)) {
4867                         err = -EINVAL;
4868                         goto err_set_expr_alloc;
4869                 }
4870                 i = 0;
4871                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4872                         if (i == NFT_SET_EXPR_MAX) {
4873                                 err = -E2BIG;
4874                                 goto err_set_expr_alloc;
4875                         }
4876                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4877                                 err = -EINVAL;
4878                                 goto err_set_expr_alloc;
4879                         }
4880                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4881                         if (IS_ERR(expr)) {
4882                                 err = PTR_ERR(expr);
4883                                 goto err_set_expr_alloc;
4884                         }
4885                         exprs[i++] = expr;
4886                         (*num_exprs)++;
4887                 }
4888         }
4889
4890         return 0;
4891
4892 err_set_expr_alloc:
4893         for (i = 0; i < *num_exprs; i++)
4894                 nft_expr_destroy(ctx, exprs[i]);
4895
4896         return err;
4897 }
4898
4899 static bool nft_set_is_same(const struct nft_set *set,
4900                             const struct nft_set_desc *desc,
4901                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4902 {
4903         int i;
4904
4905         if (set->ktype != desc->ktype ||
4906             set->dtype != desc->dtype ||
4907             set->flags != flags ||
4908             set->klen != desc->klen ||
4909             set->dlen != desc->dlen ||
4910             set->field_count != desc->field_count ||
4911             set->num_exprs != num_exprs)
4912                 return false;
4913
4914         for (i = 0; i < desc->field_count; i++) {
4915                 if (set->field_len[i] != desc->field_len[i])
4916                         return false;
4917         }
4918
4919         for (i = 0; i < num_exprs; i++) {
4920                 if (set->exprs[i]->ops != exprs[i]->ops)
4921                         return false;
4922         }
4923
4924         return true;
4925 }
4926
4927 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4928                             const struct nlattr * const nla[])
4929 {
4930         struct netlink_ext_ack *extack = info->extack;
4931         u8 genmask = nft_genmask_next(info->net);
4932         u8 family = info->nfmsg->nfgen_family;
4933         const struct nft_set_ops *ops;
4934         struct net *net = info->net;
4935         struct nft_set_desc desc;
4936         struct nft_table *table;
4937         unsigned char *udata;
4938         struct nft_set *set;
4939         struct nft_ctx ctx;
4940         size_t alloc_size;
4941         int num_exprs = 0;
4942         char *name;
4943         int err, i;
4944         u16 udlen;
4945         u32 flags;
4946         u64 size;
4947
4948         if (nla[NFTA_SET_TABLE] == NULL ||
4949             nla[NFTA_SET_NAME] == NULL ||
4950             nla[NFTA_SET_KEY_LEN] == NULL ||
4951             nla[NFTA_SET_ID] == NULL)
4952                 return -EINVAL;
4953
4954         memset(&desc, 0, sizeof(desc));
4955
4956         desc.ktype = NFT_DATA_VALUE;
4957         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4958                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4959                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4960                         return -EINVAL;
4961         }
4962
4963         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4964         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4965                 return -EINVAL;
4966
4967         flags = 0;
4968         if (nla[NFTA_SET_FLAGS] != NULL) {
4969                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4970                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4971                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4972                               NFT_SET_MAP | NFT_SET_EVAL |
4973                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4974                         return -EOPNOTSUPP;
4975                 /* Only one of these operations is supported */
4976                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4977                              (NFT_SET_MAP | NFT_SET_OBJECT))
4978                         return -EOPNOTSUPP;
4979                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4980                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4981                         return -EOPNOTSUPP;
4982         }
4983
4984         desc.dtype = 0;
4985         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4986                 if (!(flags & NFT_SET_MAP))
4987                         return -EINVAL;
4988
4989                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4990                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4991                     desc.dtype != NFT_DATA_VERDICT)
4992                         return -EINVAL;
4993
4994                 if (desc.dtype != NFT_DATA_VERDICT) {
4995                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4996                                 return -EINVAL;
4997                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4998                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4999                                 return -EINVAL;
5000                 } else
5001                         desc.dlen = sizeof(struct nft_verdict);
5002         } else if (flags & NFT_SET_MAP)
5003                 return -EINVAL;
5004
5005         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
5006                 if (!(flags & NFT_SET_OBJECT))
5007                         return -EINVAL;
5008
5009                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
5010                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
5011                     desc.objtype > NFT_OBJECT_MAX)
5012                         return -EOPNOTSUPP;
5013         } else if (flags & NFT_SET_OBJECT)
5014                 return -EINVAL;
5015         else
5016                 desc.objtype = NFT_OBJECT_UNSPEC;
5017
5018         desc.timeout = 0;
5019         if (nla[NFTA_SET_TIMEOUT] != NULL) {
5020                 if (!(flags & NFT_SET_TIMEOUT))
5021                         return -EINVAL;
5022
5023                 if (flags & NFT_SET_ANONYMOUS)
5024                         return -EOPNOTSUPP;
5025
5026                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
5027                 if (err)
5028                         return err;
5029         }
5030         desc.gc_int = 0;
5031         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
5032                 if (!(flags & NFT_SET_TIMEOUT))
5033                         return -EINVAL;
5034
5035                 if (flags & NFT_SET_ANONYMOUS)
5036                         return -EOPNOTSUPP;
5037
5038                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
5039         }
5040
5041         desc.policy = NFT_SET_POL_PERFORMANCE;
5042         if (nla[NFTA_SET_POLICY] != NULL)
5043                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
5044
5045         if (nla[NFTA_SET_DESC] != NULL) {
5046                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5047                 if (err < 0)
5048                         return err;
5049
5050                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
5051                         return -EINVAL;
5052         } else if (flags & NFT_SET_CONCAT) {
5053                 return -EINVAL;
5054         }
5055
5056         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5057                 desc.expr = true;
5058
5059         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5060                                  NETLINK_CB(skb).portid);
5061         if (IS_ERR(table)) {
5062                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5063                 return PTR_ERR(table);
5064         }
5065
5066         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5067
5068         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5069         if (IS_ERR(set)) {
5070                 if (PTR_ERR(set) != -ENOENT) {
5071                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5072                         return PTR_ERR(set);
5073                 }
5074         } else {
5075                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5076
5077                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5078                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5079                         return -EEXIST;
5080                 }
5081                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5082                         return -EOPNOTSUPP;
5083
5084                 if (nft_set_is_anonymous(set))
5085                         return -EOPNOTSUPP;
5086
5087                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5088                 if (err < 0)
5089                         return err;
5090
5091                 err = 0;
5092                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5093                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5094                         err = -EEXIST;
5095                 }
5096
5097                 for (i = 0; i < num_exprs; i++)
5098                         nft_expr_destroy(&ctx, exprs[i]);
5099
5100                 if (err < 0)
5101                         return err;
5102
5103                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5104         }
5105
5106         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5107                 return -ENOENT;
5108
5109         ops = nft_select_set_ops(&ctx, nla, &desc);
5110         if (IS_ERR(ops))
5111                 return PTR_ERR(ops);
5112
5113         udlen = 0;
5114         if (nla[NFTA_SET_USERDATA])
5115                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5116
5117         size = 0;
5118         if (ops->privsize != NULL)
5119                 size = ops->privsize(nla, &desc);
5120         alloc_size = sizeof(*set) + size + udlen;
5121         if (alloc_size < size || alloc_size > INT_MAX)
5122                 return -ENOMEM;
5123
5124         if (!nft_use_inc(&table->use))
5125                 return -EMFILE;
5126
5127         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5128         if (!set) {
5129                 err = -ENOMEM;
5130                 goto err_alloc;
5131         }
5132
5133         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5134         if (!name) {
5135                 err = -ENOMEM;
5136                 goto err_set_name;
5137         }
5138
5139         err = nf_tables_set_alloc_name(&ctx, set, name);
5140         kfree(name);
5141         if (err < 0)
5142                 goto err_set_name;
5143
5144         udata = NULL;
5145         if (udlen) {
5146                 udata = set->data + size;
5147                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5148         }
5149
5150         INIT_LIST_HEAD(&set->bindings);
5151         INIT_LIST_HEAD(&set->catchall_list);
5152         refcount_set(&set->refs, 1);
5153         set->table = table;
5154         write_pnet(&set->net, net);
5155         set->ops = ops;
5156         set->ktype = desc.ktype;
5157         set->klen = desc.klen;
5158         set->dtype = desc.dtype;
5159         set->objtype = desc.objtype;
5160         set->dlen = desc.dlen;
5161         set->flags = flags;
5162         set->size = desc.size;
5163         set->policy = desc.policy;
5164         set->udlen = udlen;
5165         set->udata = udata;
5166         set->timeout = desc.timeout;
5167         set->gc_int = desc.gc_int;
5168
5169         set->field_count = desc.field_count;
5170         for (i = 0; i < desc.field_count; i++)
5171                 set->field_len[i] = desc.field_len[i];
5172
5173         err = ops->init(set, &desc, nla);
5174         if (err < 0)
5175                 goto err_set_init;
5176
5177         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5178         if (err < 0)
5179                 goto err_set_destroy;
5180
5181         set->num_exprs = num_exprs;
5182         set->handle = nf_tables_alloc_handle(table);
5183         INIT_LIST_HEAD(&set->pending_update);
5184
5185         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5186         if (err < 0)
5187                 goto err_set_expr_alloc;
5188
5189         list_add_tail_rcu(&set->list, &table->sets);
5190
5191         return 0;
5192
5193 err_set_expr_alloc:
5194         for (i = 0; i < set->num_exprs; i++)
5195                 nft_expr_destroy(&ctx, set->exprs[i]);
5196 err_set_destroy:
5197         ops->destroy(&ctx, set);
5198 err_set_init:
5199         kfree(set->name);
5200 err_set_name:
5201         kvfree(set);
5202 err_alloc:
5203         nft_use_dec_restore(&table->use);
5204
5205         return err;
5206 }
5207
5208 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5209                                      struct nft_set *set)
5210 {
5211         struct nft_set_elem_catchall *next, *catchall;
5212
5213         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5214                 list_del_rcu(&catchall->list);
5215                 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5216                 kfree_rcu(catchall, rcu);
5217         }
5218 }
5219
5220 static void nft_set_put(struct nft_set *set)
5221 {
5222         if (refcount_dec_and_test(&set->refs)) {
5223                 kfree(set->name);
5224                 kvfree(set);
5225         }
5226 }
5227
5228 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5229 {
5230         int i;
5231
5232         if (WARN_ON(set->use > 0))
5233                 return;
5234
5235         for (i = 0; i < set->num_exprs; i++)
5236                 nft_expr_destroy(ctx, set->exprs[i]);
5237
5238         set->ops->destroy(ctx, set);
5239         nft_set_catchall_destroy(ctx, set);
5240         nft_set_put(set);
5241 }
5242
5243 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5244                             const struct nlattr * const nla[])
5245 {
5246         struct netlink_ext_ack *extack = info->extack;
5247         u8 genmask = nft_genmask_next(info->net);
5248         u8 family = info->nfmsg->nfgen_family;
5249         struct net *net = info->net;
5250         const struct nlattr *attr;
5251         struct nft_table *table;
5252         struct nft_set *set;
5253         struct nft_ctx ctx;
5254
5255         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5256                 return -EAFNOSUPPORT;
5257
5258         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5259                                  genmask, NETLINK_CB(skb).portid);
5260         if (IS_ERR(table)) {
5261                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5262                 return PTR_ERR(table);
5263         }
5264
5265         if (nla[NFTA_SET_HANDLE]) {
5266                 attr = nla[NFTA_SET_HANDLE];
5267                 set = nft_set_lookup_byhandle(table, attr, genmask);
5268         } else {
5269                 attr = nla[NFTA_SET_NAME];
5270                 set = nft_set_lookup(table, attr, genmask);
5271         }
5272
5273         if (IS_ERR(set)) {
5274                 if (PTR_ERR(set) == -ENOENT &&
5275                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5276                         return 0;
5277
5278                 NL_SET_BAD_ATTR(extack, attr);
5279                 return PTR_ERR(set);
5280         }
5281         if (set->use ||
5282             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5283              atomic_read(&set->nelems) > 0)) {
5284                 NL_SET_BAD_ATTR(extack, attr);
5285                 return -EBUSY;
5286         }
5287
5288         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5289
5290         return nft_delset(&ctx, set);
5291 }
5292
5293 static int nft_validate_register_store(const struct nft_ctx *ctx,
5294                                        enum nft_registers reg,
5295                                        const struct nft_data *data,
5296                                        enum nft_data_types type,
5297                                        unsigned int len);
5298
5299 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5300                                      struct nft_set *set,
5301                                      struct nft_elem_priv *elem_priv)
5302 {
5303         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5304         enum nft_registers dreg;
5305
5306         dreg = nft_type_to_reg(set->dtype);
5307         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5308                                            set->dtype == NFT_DATA_VERDICT ?
5309                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5310                                            set->dlen);
5311 }
5312
5313 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5314                                         struct nft_set *set,
5315                                         const struct nft_set_iter *iter,
5316                                         struct nft_elem_priv *elem_priv)
5317 {
5318         return nft_setelem_data_validate(ctx, set, elem_priv);
5319 }
5320
5321 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5322                                        struct nft_set *set)
5323 {
5324         u8 genmask = nft_genmask_next(ctx->net);
5325         struct nft_set_elem_catchall *catchall;
5326         struct nft_set_ext *ext;
5327         int ret = 0;
5328
5329         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5330                 ext = nft_set_elem_ext(set, catchall->elem);
5331                 if (!nft_set_elem_active(ext, genmask))
5332                         continue;
5333
5334                 ret = nft_setelem_data_validate(ctx, set, catchall->elem);
5335                 if (ret < 0)
5336                         break;
5337         }
5338
5339         return ret;
5340 }
5341
5342 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5343                        struct nft_set_binding *binding)
5344 {
5345         struct nft_set_binding *i;
5346         struct nft_set_iter iter;
5347
5348         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5349                 return -EBUSY;
5350
5351         if (binding->flags & NFT_SET_MAP) {
5352                 /* If the set is already bound to the same chain all
5353                  * jumps are already validated for that chain.
5354                  */
5355                 list_for_each_entry(i, &set->bindings, list) {
5356                         if (i->flags & NFT_SET_MAP &&
5357                             i->chain == binding->chain)
5358                                 goto bind;
5359                 }
5360
5361                 iter.genmask    = nft_genmask_next(ctx->net);
5362                 iter.skip       = 0;
5363                 iter.count      = 0;
5364                 iter.err        = 0;
5365                 iter.fn         = nf_tables_bind_check_setelem;
5366
5367                 set->ops->walk(ctx, set, &iter);
5368                 if (!iter.err)
5369                         iter.err = nft_set_catchall_bind_check(ctx, set);
5370
5371                 if (iter.err < 0)
5372                         return iter.err;
5373         }
5374 bind:
5375         if (!nft_use_inc(&set->use))
5376                 return -EMFILE;
5377
5378         binding->chain = ctx->chain;
5379         list_add_tail_rcu(&binding->list, &set->bindings);
5380         nft_set_trans_bind(ctx, set);
5381
5382         return 0;
5383 }
5384 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5385
5386 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5387                                  struct nft_set_binding *binding, bool event)
5388 {
5389         list_del_rcu(&binding->list);
5390
5391         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5392                 list_del_rcu(&set->list);
5393                 if (event)
5394                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5395                                              GFP_KERNEL);
5396         }
5397 }
5398
5399 static void nft_setelem_data_activate(const struct net *net,
5400                                       const struct nft_set *set,
5401                                       struct nft_elem_priv *elem_priv);
5402
5403 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5404                                 struct nft_set *set,
5405                                 const struct nft_set_iter *iter,
5406                                 struct nft_elem_priv *elem_priv)
5407 {
5408         nft_setelem_data_activate(ctx->net, set, elem_priv);
5409
5410         return 0;
5411 }
5412
5413 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5414                                       struct nft_set *set)
5415 {
5416         u8 genmask = nft_genmask_next(ctx->net);
5417         struct nft_set_elem_catchall *catchall;
5418         struct nft_set_ext *ext;
5419
5420         list_for_each_entry(catchall, &set->catchall_list, list) {
5421                 ext = nft_set_elem_ext(set, catchall->elem);
5422                 if (!nft_set_elem_active(ext, genmask))
5423                         continue;
5424
5425                 nft_setelem_data_activate(ctx->net, set, catchall->elem);
5426                 break;
5427         }
5428 }
5429
5430 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5431 {
5432         struct nft_set_iter iter = {
5433                 .genmask        = nft_genmask_next(ctx->net),
5434                 .fn             = nft_mapelem_activate,
5435         };
5436
5437         set->ops->walk(ctx, set, &iter);
5438         WARN_ON_ONCE(iter.err);
5439
5440         nft_map_catchall_activate(ctx, set);
5441 }
5442
5443 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5444 {
5445         if (nft_set_is_anonymous(set)) {
5446                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5447                         nft_map_activate(ctx, set);
5448
5449                 nft_clear(ctx->net, set);
5450         }
5451
5452         nft_use_inc_restore(&set->use);
5453 }
5454 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5455
5456 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5457                               struct nft_set_binding *binding,
5458                               enum nft_trans_phase phase)
5459 {
5460         switch (phase) {
5461         case NFT_TRANS_PREPARE_ERROR:
5462                 nft_set_trans_unbind(ctx, set);
5463                 if (nft_set_is_anonymous(set))
5464                         nft_deactivate_next(ctx->net, set);
5465                 else
5466                         list_del_rcu(&binding->list);
5467
5468                 nft_use_dec(&set->use);
5469                 break;
5470         case NFT_TRANS_PREPARE:
5471                 if (nft_set_is_anonymous(set)) {
5472                         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5473                                 nft_map_deactivate(ctx, set);
5474
5475                         nft_deactivate_next(ctx->net, set);
5476                 }
5477                 nft_use_dec(&set->use);
5478                 return;
5479         case NFT_TRANS_ABORT:
5480         case NFT_TRANS_RELEASE:
5481                 if (nft_set_is_anonymous(set) &&
5482                     set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5483                         nft_map_deactivate(ctx, set);
5484
5485                 nft_use_dec(&set->use);
5486                 fallthrough;
5487         default:
5488                 nf_tables_unbind_set(ctx, set, binding,
5489                                      phase == NFT_TRANS_COMMIT);
5490         }
5491 }
5492 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5493
5494 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5495 {
5496         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5497                 nft_set_destroy(ctx, set);
5498 }
5499 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5500
5501 const struct nft_set_ext_type nft_set_ext_types[] = {
5502         [NFT_SET_EXT_KEY]               = {
5503                 .align  = __alignof__(u32),
5504         },
5505         [NFT_SET_EXT_DATA]              = {
5506                 .align  = __alignof__(u32),
5507         },
5508         [NFT_SET_EXT_EXPRESSIONS]       = {
5509                 .align  = __alignof__(struct nft_set_elem_expr),
5510         },
5511         [NFT_SET_EXT_OBJREF]            = {
5512                 .len    = sizeof(struct nft_object *),
5513                 .align  = __alignof__(struct nft_object *),
5514         },
5515         [NFT_SET_EXT_FLAGS]             = {
5516                 .len    = sizeof(u8),
5517                 .align  = __alignof__(u8),
5518         },
5519         [NFT_SET_EXT_TIMEOUT]           = {
5520                 .len    = sizeof(u64),
5521                 .align  = __alignof__(u64),
5522         },
5523         [NFT_SET_EXT_EXPIRATION]        = {
5524                 .len    = sizeof(u64),
5525                 .align  = __alignof__(u64),
5526         },
5527         [NFT_SET_EXT_USERDATA]          = {
5528                 .len    = sizeof(struct nft_userdata),
5529                 .align  = __alignof__(struct nft_userdata),
5530         },
5531         [NFT_SET_EXT_KEY_END]           = {
5532                 .align  = __alignof__(u32),
5533         },
5534 };
5535
5536 /*
5537  * Set elements
5538  */
5539
5540 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5541         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5542         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5543         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5544         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5545         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5546         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5547                                             .len = NFT_USERDATA_MAXLEN },
5548         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5549         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5550                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5551         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5552         [NFTA_SET_ELEM_EXPRESSIONS]     = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
5553 };
5554
5555 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5556         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5557                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5558         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5559                                             .len = NFT_SET_MAXNAMELEN - 1 },
5560         [NFTA_SET_ELEM_LIST_ELEMENTS]   = NLA_POLICY_NESTED_ARRAY(nft_set_elem_policy),
5561         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5562 };
5563
5564 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5565                                   const struct nft_set *set,
5566                                   const struct nft_set_ext *ext,
5567                                   bool reset)
5568 {
5569         struct nft_set_elem_expr *elem_expr;
5570         u32 size, num_exprs = 0;
5571         struct nft_expr *expr;
5572         struct nlattr *nest;
5573
5574         elem_expr = nft_set_ext_expr(ext);
5575         nft_setelem_expr_foreach(expr, elem_expr, size)
5576                 num_exprs++;
5577
5578         if (num_exprs == 1) {
5579                 expr = nft_setelem_expr_at(elem_expr, 0);
5580                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5581                         return -1;
5582
5583                 return 0;
5584         } else if (num_exprs > 1) {
5585                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5586                 if (nest == NULL)
5587                         goto nla_put_failure;
5588
5589                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5590                         expr = nft_setelem_expr_at(elem_expr, size);
5591                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5592                                 goto nla_put_failure;
5593                 }
5594                 nla_nest_end(skb, nest);
5595         }
5596         return 0;
5597
5598 nla_put_failure:
5599         return -1;
5600 }
5601
5602 static int nf_tables_fill_setelem(struct sk_buff *skb,
5603                                   const struct nft_set *set,
5604                                   const struct nft_elem_priv *elem_priv,
5605                                   bool reset)
5606 {
5607         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5608         unsigned char *b = skb_tail_pointer(skb);
5609         struct nlattr *nest;
5610
5611         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5612         if (nest == NULL)
5613                 goto nla_put_failure;
5614
5615         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5616             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5617                           NFT_DATA_VALUE, set->klen) < 0)
5618                 goto nla_put_failure;
5619
5620         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5621             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5622                           NFT_DATA_VALUE, set->klen) < 0)
5623                 goto nla_put_failure;
5624
5625         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5626             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5627                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5628                           set->dlen) < 0)
5629                 goto nla_put_failure;
5630
5631         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5632             nft_set_elem_expr_dump(skb, set, ext, reset))
5633                 goto nla_put_failure;
5634
5635         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5636             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5637                            (*nft_set_ext_obj(ext))->key.name) < 0)
5638                 goto nla_put_failure;
5639
5640         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5641             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5642                          htonl(*nft_set_ext_flags(ext))))
5643                 goto nla_put_failure;
5644
5645         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5646             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5647                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5648                          NFTA_SET_ELEM_PAD))
5649                 goto nla_put_failure;
5650
5651         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5652                 u64 expires, now = get_jiffies_64();
5653
5654                 expires = *nft_set_ext_expiration(ext);
5655                 if (time_before64(now, expires))
5656                         expires -= now;
5657                 else
5658                         expires = 0;
5659
5660                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5661                                  nf_jiffies64_to_msecs(expires),
5662                                  NFTA_SET_ELEM_PAD))
5663                         goto nla_put_failure;
5664         }
5665
5666         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5667                 struct nft_userdata *udata;
5668
5669                 udata = nft_set_ext_userdata(ext);
5670                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5671                             udata->len + 1, udata->data))
5672                         goto nla_put_failure;
5673         }
5674
5675         nla_nest_end(skb, nest);
5676         return 0;
5677
5678 nla_put_failure:
5679         nlmsg_trim(skb, b);
5680         return -EMSGSIZE;
5681 }
5682
5683 struct nft_set_dump_args {
5684         const struct netlink_callback   *cb;
5685         struct nft_set_iter             iter;
5686         struct sk_buff                  *skb;
5687         bool                            reset;
5688 };
5689
5690 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5691                                   struct nft_set *set,
5692                                   const struct nft_set_iter *iter,
5693                                   struct nft_elem_priv *elem_priv)
5694 {
5695         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5696         struct nft_set_dump_args *args;
5697
5698         if (nft_set_elem_expired(ext))
5699                 return 0;
5700
5701         args = container_of(iter, struct nft_set_dump_args, iter);
5702         return nf_tables_fill_setelem(args->skb, set, elem_priv, args->reset);
5703 }
5704
5705 static void audit_log_nft_set_reset(const struct nft_table *table,
5706                                     unsigned int base_seq,
5707                                     unsigned int nentries)
5708 {
5709         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5710
5711         audit_log_nfcfg(buf, table->family, nentries,
5712                         AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5713         kfree(buf);
5714 }
5715
5716 struct nft_set_dump_ctx {
5717         const struct nft_set    *set;
5718         struct nft_ctx          ctx;
5719         bool                    reset;
5720 };
5721
5722 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5723                                  const struct nft_set *set, bool reset,
5724                                  unsigned int base_seq)
5725 {
5726         struct nft_set_elem_catchall *catchall;
5727         u8 genmask = nft_genmask_cur(net);
5728         struct nft_set_ext *ext;
5729         int ret = 0;
5730
5731         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5732                 ext = nft_set_elem_ext(set, catchall->elem);
5733                 if (!nft_set_elem_active(ext, genmask) ||
5734                     nft_set_elem_expired(ext))
5735                         continue;
5736
5737                 ret = nf_tables_fill_setelem(skb, set, catchall->elem, reset);
5738                 if (reset && !ret)
5739                         audit_log_nft_set_reset(set->table, base_seq, 1);
5740                 break;
5741         }
5742
5743         return ret;
5744 }
5745
5746 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5747 {
5748         struct nft_set_dump_ctx *dump_ctx = cb->data;
5749         struct net *net = sock_net(skb->sk);
5750         struct nftables_pernet *nft_net;
5751         struct nft_table *table;
5752         struct nft_set *set;
5753         struct nft_set_dump_args args;
5754         bool set_found = false;
5755         struct nlmsghdr *nlh;
5756         struct nlattr *nest;
5757         u32 portid, seq;
5758         int event;
5759
5760         rcu_read_lock();
5761         nft_net = nft_pernet(net);
5762         cb->seq = READ_ONCE(nft_net->base_seq);
5763
5764         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5765                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5766                     dump_ctx->ctx.family != table->family)
5767                         continue;
5768
5769                 if (table != dump_ctx->ctx.table)
5770                         continue;
5771
5772                 list_for_each_entry_rcu(set, &table->sets, list) {
5773                         if (set == dump_ctx->set) {
5774                                 set_found = true;
5775                                 break;
5776                         }
5777                 }
5778                 break;
5779         }
5780
5781         if (!set_found) {
5782                 rcu_read_unlock();
5783                 return -ENOENT;
5784         }
5785
5786         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5787         portid = NETLINK_CB(cb->skb).portid;
5788         seq    = cb->nlh->nlmsg_seq;
5789
5790         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5791                            table->family, NFNETLINK_V0, nft_base_seq(net));
5792         if (!nlh)
5793                 goto nla_put_failure;
5794
5795         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5796                 goto nla_put_failure;
5797         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5798                 goto nla_put_failure;
5799
5800         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5801         if (nest == NULL)
5802                 goto nla_put_failure;
5803
5804         args.cb                 = cb;
5805         args.skb                = skb;
5806         args.reset              = dump_ctx->reset;
5807         args.iter.genmask       = nft_genmask_cur(net);
5808         args.iter.skip          = cb->args[0];
5809         args.iter.count         = 0;
5810         args.iter.err           = 0;
5811         args.iter.fn            = nf_tables_dump_setelem;
5812         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5813
5814         if (!args.iter.err && args.iter.count == cb->args[0])
5815                 args.iter.err = nft_set_catchall_dump(net, skb, set,
5816                                                       dump_ctx->reset, cb->seq);
5817         nla_nest_end(skb, nest);
5818         nlmsg_end(skb, nlh);
5819
5820         if (dump_ctx->reset && args.iter.count > args.iter.skip)
5821                 audit_log_nft_set_reset(table, cb->seq,
5822                                         args.iter.count - args.iter.skip);
5823
5824         rcu_read_unlock();
5825
5826         if (args.iter.err && args.iter.err != -EMSGSIZE)
5827                 return args.iter.err;
5828         if (args.iter.count == cb->args[0])
5829                 return 0;
5830
5831         cb->args[0] = args.iter.count;
5832         return skb->len;
5833
5834 nla_put_failure:
5835         rcu_read_unlock();
5836         return -ENOSPC;
5837 }
5838
5839 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5840 {
5841         struct nft_set_dump_ctx *dump_ctx = cb->data;
5842
5843         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5844
5845         return cb->data ? 0 : -ENOMEM;
5846 }
5847
5848 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5849 {
5850         kfree(cb->data);
5851         return 0;
5852 }
5853
5854 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5855                                        const struct nft_ctx *ctx, u32 seq,
5856                                        u32 portid, int event, u16 flags,
5857                                        const struct nft_set *set,
5858                                        const struct nft_elem_priv *elem_priv,
5859                                        bool reset)
5860 {
5861         struct nlmsghdr *nlh;
5862         struct nlattr *nest;
5863         int err;
5864
5865         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5866         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5867                            NFNETLINK_V0, nft_base_seq(ctx->net));
5868         if (!nlh)
5869                 goto nla_put_failure;
5870
5871         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5872                 goto nla_put_failure;
5873         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5874                 goto nla_put_failure;
5875
5876         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5877         if (nest == NULL)
5878                 goto nla_put_failure;
5879
5880         err = nf_tables_fill_setelem(skb, set, elem_priv, reset);
5881         if (err < 0)
5882                 goto nla_put_failure;
5883
5884         nla_nest_end(skb, nest);
5885
5886         nlmsg_end(skb, nlh);
5887         return 0;
5888
5889 nla_put_failure:
5890         nlmsg_trim(skb, nlh);
5891         return -1;
5892 }
5893
5894 static int nft_setelem_parse_flags(const struct nft_set *set,
5895                                    const struct nlattr *attr, u32 *flags)
5896 {
5897         if (attr == NULL)
5898                 return 0;
5899
5900         *flags = ntohl(nla_get_be32(attr));
5901         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5902                 return -EOPNOTSUPP;
5903         if (!(set->flags & NFT_SET_INTERVAL) &&
5904             *flags & NFT_SET_ELEM_INTERVAL_END)
5905                 return -EINVAL;
5906         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5907             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5908                 return -EINVAL;
5909
5910         return 0;
5911 }
5912
5913 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5914                                  struct nft_data *key, struct nlattr *attr)
5915 {
5916         struct nft_data_desc desc = {
5917                 .type   = NFT_DATA_VALUE,
5918                 .size   = NFT_DATA_VALUE_MAXLEN,
5919                 .len    = set->klen,
5920         };
5921
5922         return nft_data_init(ctx, key, &desc, attr);
5923 }
5924
5925 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5926                                   struct nft_data_desc *desc,
5927                                   struct nft_data *data,
5928                                   struct nlattr *attr)
5929 {
5930         u32 dtype;
5931
5932         if (set->dtype == NFT_DATA_VERDICT)
5933                 dtype = NFT_DATA_VERDICT;
5934         else
5935                 dtype = NFT_DATA_VALUE;
5936
5937         desc->type = dtype;
5938         desc->size = NFT_DATA_VALUE_MAXLEN;
5939         desc->len = set->dlen;
5940         desc->flags = NFT_DATA_DESC_SETELEM;
5941
5942         return nft_data_init(ctx, data, desc, attr);
5943 }
5944
5945 static void *nft_setelem_catchall_get(const struct net *net,
5946                                       const struct nft_set *set)
5947 {
5948         struct nft_set_elem_catchall *catchall;
5949         u8 genmask = nft_genmask_cur(net);
5950         struct nft_set_ext *ext;
5951         void *priv = NULL;
5952
5953         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5954                 ext = nft_set_elem_ext(set, catchall->elem);
5955                 if (!nft_set_elem_active(ext, genmask) ||
5956                     nft_set_elem_expired(ext))
5957                         continue;
5958
5959                 priv = catchall->elem;
5960                 break;
5961         }
5962
5963         return priv;
5964 }
5965
5966 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5967                            struct nft_set_elem *elem, u32 flags)
5968 {
5969         void *priv;
5970
5971         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5972                 priv = set->ops->get(ctx->net, set, elem, flags);
5973                 if (IS_ERR(priv))
5974                         return PTR_ERR(priv);
5975         } else {
5976                 priv = nft_setelem_catchall_get(ctx->net, set);
5977                 if (!priv)
5978                         return -ENOENT;
5979         }
5980         elem->priv = priv;
5981
5982         return 0;
5983 }
5984
5985 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5986                             const struct nlattr *attr, bool reset)
5987 {
5988         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5989         struct nft_set_elem elem;
5990         struct sk_buff *skb;
5991         uint32_t flags = 0;
5992         int err;
5993
5994         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5995                                           nft_set_elem_policy, NULL);
5996         if (err < 0)
5997                 return err;
5998
5999         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6000         if (err < 0)
6001                 return err;
6002
6003         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6004                 return -EINVAL;
6005
6006         if (nla[NFTA_SET_ELEM_KEY]) {
6007                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6008                                             nla[NFTA_SET_ELEM_KEY]);
6009                 if (err < 0)
6010                         return err;
6011         }
6012
6013         if (nla[NFTA_SET_ELEM_KEY_END]) {
6014                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6015                                             nla[NFTA_SET_ELEM_KEY_END]);
6016                 if (err < 0)
6017                         return err;
6018         }
6019
6020         err = nft_setelem_get(ctx, set, &elem, flags);
6021         if (err < 0)
6022                 return err;
6023
6024         err = -ENOMEM;
6025         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6026         if (skb == NULL)
6027                 return err;
6028
6029         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6030                                           NFT_MSG_NEWSETELEM, 0, set, elem.priv,
6031                                           reset);
6032         if (err < 0)
6033                 goto err_fill_setelem;
6034
6035         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6036
6037 err_fill_setelem:
6038         kfree_skb(skb);
6039         return err;
6040 }
6041
6042 /* called with rcu_read_lock held */
6043 static int nf_tables_getsetelem(struct sk_buff *skb,
6044                                 const struct nfnl_info *info,
6045                                 const struct nlattr * const nla[])
6046 {
6047         struct netlink_ext_ack *extack = info->extack;
6048         u8 genmask = nft_genmask_cur(info->net);
6049         u8 family = info->nfmsg->nfgen_family;
6050         int rem, err = 0, nelems = 0;
6051         struct net *net = info->net;
6052         struct nft_table *table;
6053         struct nft_set *set;
6054         struct nlattr *attr;
6055         struct nft_ctx ctx;
6056         bool reset = false;
6057
6058         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6059                                  genmask, 0);
6060         if (IS_ERR(table)) {
6061                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6062                 return PTR_ERR(table);
6063         }
6064
6065         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6066         if (IS_ERR(set)) {
6067                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
6068                 return PTR_ERR(set);
6069         }
6070
6071         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6072
6073         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
6074                 reset = true;
6075
6076         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6077                 struct netlink_dump_control c = {
6078                         .start = nf_tables_dump_set_start,
6079                         .dump = nf_tables_dump_set,
6080                         .done = nf_tables_dump_set_done,
6081                         .module = THIS_MODULE,
6082                 };
6083                 struct nft_set_dump_ctx dump_ctx = {
6084                         .set = set,
6085                         .ctx = ctx,
6086                         .reset = reset,
6087                 };
6088
6089                 c.data = &dump_ctx;
6090                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6091         }
6092
6093         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6094                 return -EINVAL;
6095
6096         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6097                 err = nft_get_set_elem(&ctx, set, attr, reset);
6098                 if (err < 0) {
6099                         NL_SET_BAD_ATTR(extack, attr);
6100                         break;
6101                 }
6102                 nelems++;
6103         }
6104
6105         if (reset)
6106                 audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
6107                                         nelems);
6108
6109         return err;
6110 }
6111
6112 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6113                                      const struct nft_set *set,
6114                                      const struct nft_elem_priv *elem_priv,
6115                                      int event)
6116 {
6117         struct nftables_pernet *nft_net;
6118         struct net *net = ctx->net;
6119         u32 portid = ctx->portid;
6120         struct sk_buff *skb;
6121         u16 flags = 0;
6122         int err;
6123
6124         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6125                 return;
6126
6127         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6128         if (skb == NULL)
6129                 goto err;
6130
6131         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6132                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6133
6134         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6135                                           set, elem_priv, false);
6136         if (err < 0) {
6137                 kfree_skb(skb);
6138                 goto err;
6139         }
6140
6141         nft_net = nft_pernet(net);
6142         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6143         return;
6144 err:
6145         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6146 }
6147
6148 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6149                                               int msg_type,
6150                                               struct nft_set *set)
6151 {
6152         struct nft_trans *trans;
6153
6154         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6155         if (trans == NULL)
6156                 return NULL;
6157
6158         nft_trans_elem_set(trans) = set;
6159         return trans;
6160 }
6161
6162 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6163                                          const struct nft_set *set,
6164                                          const struct nlattr *attr)
6165 {
6166         struct nft_expr *expr;
6167         int err;
6168
6169         expr = nft_expr_init(ctx, attr);
6170         if (IS_ERR(expr))
6171                 return expr;
6172
6173         err = -EOPNOTSUPP;
6174         if (expr->ops->type->flags & NFT_EXPR_GC) {
6175                 if (set->flags & NFT_SET_TIMEOUT)
6176                         goto err_set_elem_expr;
6177                 if (!set->ops->gc_init)
6178                         goto err_set_elem_expr;
6179                 set->ops->gc_init(set);
6180         }
6181
6182         return expr;
6183
6184 err_set_elem_expr:
6185         nft_expr_destroy(ctx, expr);
6186         return ERR_PTR(err);
6187 }
6188
6189 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6190 {
6191         len += nft_set_ext_types[id].len;
6192         if (len > tmpl->ext_len[id] ||
6193             len > U8_MAX)
6194                 return -1;
6195
6196         return 0;
6197 }
6198
6199 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6200                               void *to, const void *from, u32 len)
6201 {
6202         if (nft_set_ext_check(tmpl, id, len) < 0)
6203                 return -1;
6204
6205         memcpy(to, from, len);
6206
6207         return 0;
6208 }
6209
6210 struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
6211                                         const struct nft_set_ext_tmpl *tmpl,
6212                                         const u32 *key, const u32 *key_end,
6213                                         const u32 *data,
6214                                         u64 timeout, u64 expiration, gfp_t gfp)
6215 {
6216         struct nft_set_ext *ext;
6217         void *elem;
6218
6219         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6220         if (elem == NULL)
6221                 return ERR_PTR(-ENOMEM);
6222
6223         ext = nft_set_elem_ext(set, elem);
6224         nft_set_ext_init(ext, tmpl);
6225
6226         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6227             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6228                                nft_set_ext_key(ext), key, set->klen) < 0)
6229                 goto err_ext_check;
6230
6231         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6232             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6233                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6234                 goto err_ext_check;
6235
6236         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6237             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6238                                nft_set_ext_data(ext), data, set->dlen) < 0)
6239                 goto err_ext_check;
6240
6241         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6242                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6243                 if (expiration == 0)
6244                         *nft_set_ext_expiration(ext) += timeout;
6245         }
6246         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6247                 *nft_set_ext_timeout(ext) = timeout;
6248
6249         return elem;
6250
6251 err_ext_check:
6252         kfree(elem);
6253
6254         return ERR_PTR(-EINVAL);
6255 }
6256
6257 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6258                                         struct nft_expr *expr)
6259 {
6260         if (expr->ops->destroy_clone) {
6261                 expr->ops->destroy_clone(ctx, expr);
6262                 module_put(expr->ops->type->owner);
6263         } else {
6264                 nf_tables_expr_destroy(ctx, expr);
6265         }
6266 }
6267
6268 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6269                                       struct nft_set_elem_expr *elem_expr)
6270 {
6271         struct nft_expr *expr;
6272         u32 size;
6273
6274         nft_setelem_expr_foreach(expr, elem_expr, size)
6275                 __nft_set_elem_expr_destroy(ctx, expr);
6276 }
6277
6278 /* Drop references and destroy. Called from gc, dynset and abort path. */
6279 void nft_set_elem_destroy(const struct nft_set *set,
6280                           const struct nft_elem_priv *elem_priv,
6281                           bool destroy_expr)
6282 {
6283         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6284         struct nft_ctx ctx = {
6285                 .net    = read_pnet(&set->net),
6286                 .family = set->table->family,
6287         };
6288
6289         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6290         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6291                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6292         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6293                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6294         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6295                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6296
6297         kfree(elem_priv);
6298 }
6299 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6300
6301 /* Destroy element. References have been already dropped in the preparation
6302  * path via nft_setelem_data_deactivate().
6303  */
6304 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6305                                 const struct nft_set *set,
6306                                 const struct nft_elem_priv *elem_priv)
6307 {
6308         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6309
6310         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6311                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6312
6313         kfree(elem_priv);
6314 }
6315
6316 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6317                             struct nft_expr *expr_array[])
6318 {
6319         struct nft_expr *expr;
6320         int err, i, k;
6321
6322         for (i = 0; i < set->num_exprs; i++) {
6323                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6324                 if (!expr)
6325                         goto err_expr;
6326
6327                 err = nft_expr_clone(expr, set->exprs[i]);
6328                 if (err < 0) {
6329                         kfree(expr);
6330                         goto err_expr;
6331                 }
6332                 expr_array[i] = expr;
6333         }
6334
6335         return 0;
6336
6337 err_expr:
6338         for (k = i - 1; k >= 0; k--)
6339                 nft_expr_destroy(ctx, expr_array[k]);
6340
6341         return -ENOMEM;
6342 }
6343
6344 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6345                                    const struct nft_set_ext_tmpl *tmpl,
6346                                    const struct nft_set_ext *ext,
6347                                    struct nft_expr *expr_array[],
6348                                    u32 num_exprs)
6349 {
6350         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6351         u32 len = sizeof(struct nft_set_elem_expr);
6352         struct nft_expr *expr;
6353         int i, err;
6354
6355         if (num_exprs == 0)
6356                 return 0;
6357
6358         for (i = 0; i < num_exprs; i++)
6359                 len += expr_array[i]->ops->size;
6360
6361         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6362                 return -EINVAL;
6363
6364         for (i = 0; i < num_exprs; i++) {
6365                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6366                 err = nft_expr_clone(expr, expr_array[i]);
6367                 if (err < 0)
6368                         goto err_elem_expr_setup;
6369
6370                 elem_expr->size += expr_array[i]->ops->size;
6371                 nft_expr_destroy(ctx, expr_array[i]);
6372                 expr_array[i] = NULL;
6373         }
6374
6375         return 0;
6376
6377 err_elem_expr_setup:
6378         for (; i < num_exprs; i++) {
6379                 nft_expr_destroy(ctx, expr_array[i]);
6380                 expr_array[i] = NULL;
6381         }
6382
6383         return -ENOMEM;
6384 }
6385
6386 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6387                                             const struct nft_set *set)
6388 {
6389         struct nft_set_elem_catchall *catchall;
6390         u8 genmask = nft_genmask_cur(net);
6391         struct nft_set_ext *ext;
6392
6393         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6394                 ext = nft_set_elem_ext(set, catchall->elem);
6395                 if (nft_set_elem_active(ext, genmask) &&
6396                     !nft_set_elem_expired(ext) &&
6397                     !nft_set_elem_is_dead(ext))
6398                         return ext;
6399         }
6400
6401         return NULL;
6402 }
6403 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6404
6405 static int nft_setelem_catchall_insert(const struct net *net,
6406                                        struct nft_set *set,
6407                                        const struct nft_set_elem *elem,
6408                                        struct nft_elem_priv **priv)
6409 {
6410         struct nft_set_elem_catchall *catchall;
6411         u8 genmask = nft_genmask_next(net);
6412         struct nft_set_ext *ext;
6413
6414         list_for_each_entry(catchall, &set->catchall_list, list) {
6415                 ext = nft_set_elem_ext(set, catchall->elem);
6416                 if (nft_set_elem_active(ext, genmask)) {
6417                         *priv = catchall->elem;
6418                         return -EEXIST;
6419                 }
6420         }
6421
6422         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6423         if (!catchall)
6424                 return -ENOMEM;
6425
6426         catchall->elem = elem->priv;
6427         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6428
6429         return 0;
6430 }
6431
6432 static int nft_setelem_insert(const struct net *net,
6433                               struct nft_set *set,
6434                               const struct nft_set_elem *elem,
6435                               struct nft_elem_priv **elem_priv,
6436                               unsigned int flags)
6437 {
6438         int ret;
6439
6440         if (flags & NFT_SET_ELEM_CATCHALL)
6441                 ret = nft_setelem_catchall_insert(net, set, elem, elem_priv);
6442         else
6443                 ret = set->ops->insert(net, set, elem, elem_priv);
6444
6445         return ret;
6446 }
6447
6448 static bool nft_setelem_is_catchall(const struct nft_set *set,
6449                                     const struct nft_elem_priv *elem_priv)
6450 {
6451         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6452
6453         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6454             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6455                 return true;
6456
6457         return false;
6458 }
6459
6460 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6461                                  struct nft_elem_priv *elem_priv)
6462 {
6463         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6464
6465         if (nft_setelem_is_catchall(set, elem_priv)) {
6466                 nft_set_elem_change_active(net, set, ext);
6467         } else {
6468                 set->ops->activate(net, set, elem_priv);
6469         }
6470 }
6471
6472 static int nft_setelem_catchall_deactivate(const struct net *net,
6473                                            struct nft_set *set,
6474                                            struct nft_set_elem *elem)
6475 {
6476         struct nft_set_elem_catchall *catchall;
6477         struct nft_set_ext *ext;
6478
6479         list_for_each_entry(catchall, &set->catchall_list, list) {
6480                 ext = nft_set_elem_ext(set, catchall->elem);
6481                 if (!nft_is_active(net, ext))
6482                         continue;
6483
6484                 kfree(elem->priv);
6485                 elem->priv = catchall->elem;
6486                 nft_set_elem_change_active(net, set, ext);
6487                 return 0;
6488         }
6489
6490         return -ENOENT;
6491 }
6492
6493 static int __nft_setelem_deactivate(const struct net *net,
6494                                     struct nft_set *set,
6495                                     struct nft_set_elem *elem)
6496 {
6497         void *priv;
6498
6499         priv = set->ops->deactivate(net, set, elem);
6500         if (!priv)
6501                 return -ENOENT;
6502
6503         kfree(elem->priv);
6504         elem->priv = priv;
6505         set->ndeact++;
6506
6507         return 0;
6508 }
6509
6510 static int nft_setelem_deactivate(const struct net *net,
6511                                   struct nft_set *set,
6512                                   struct nft_set_elem *elem, u32 flags)
6513 {
6514         int ret;
6515
6516         if (flags & NFT_SET_ELEM_CATCHALL)
6517                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6518         else
6519                 ret = __nft_setelem_deactivate(net, set, elem);
6520
6521         return ret;
6522 }
6523
6524 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6525 {
6526         list_del_rcu(&catchall->list);
6527         kfree_rcu(catchall, rcu);
6528 }
6529
6530 static void nft_setelem_catchall_remove(const struct net *net,
6531                                         const struct nft_set *set,
6532                                         struct nft_elem_priv *elem_priv)
6533 {
6534         struct nft_set_elem_catchall *catchall, *next;
6535
6536         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6537                 if (catchall->elem == elem_priv) {
6538                         nft_setelem_catchall_destroy(catchall);
6539                         break;
6540                 }
6541         }
6542 }
6543
6544 static void nft_setelem_remove(const struct net *net,
6545                                const struct nft_set *set,
6546                                struct nft_elem_priv *elem_priv)
6547 {
6548         if (nft_setelem_is_catchall(set, elem_priv))
6549                 nft_setelem_catchall_remove(net, set, elem_priv);
6550         else
6551                 set->ops->remove(net, set, elem_priv);
6552 }
6553
6554 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6555                                       struct nlattr **nla, u32 flags)
6556 {
6557         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6558                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6559                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6560                         return false;
6561
6562                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6563                     flags & NFT_SET_ELEM_CATCHALL)
6564                         return false;
6565         } else {
6566                 if (nla[NFTA_SET_ELEM_KEY_END])
6567                         return false;
6568         }
6569
6570         return true;
6571 }
6572
6573 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6574                             const struct nlattr *attr, u32 nlmsg_flags)
6575 {
6576         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6577         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6578         u8 genmask = nft_genmask_next(ctx->net);
6579         u32 flags = 0, size = 0, num_exprs = 0;
6580         struct nft_set_ext_tmpl tmpl;
6581         struct nft_set_ext *ext, *ext2;
6582         struct nft_set_elem elem;
6583         struct nft_set_binding *binding;
6584         struct nft_elem_priv *elem_priv;
6585         struct nft_object *obj = NULL;
6586         struct nft_userdata *udata;
6587         struct nft_data_desc desc;
6588         enum nft_registers dreg;
6589         struct nft_trans *trans;
6590         u64 expiration;
6591         u64 timeout;
6592         int err, i;
6593         u8 ulen;
6594
6595         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6596                                           nft_set_elem_policy, NULL);
6597         if (err < 0)
6598                 return err;
6599
6600         nft_set_ext_prepare(&tmpl);
6601
6602         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6603         if (err < 0)
6604                 return err;
6605
6606         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6607             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6608                 return -EINVAL;
6609
6610         if (flags != 0) {
6611                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6612                 if (err < 0)
6613                         return err;
6614         }
6615
6616         if (set->flags & NFT_SET_MAP) {
6617                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6618                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6619                         return -EINVAL;
6620         } else {
6621                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6622                         return -EINVAL;
6623         }
6624
6625         if (set->flags & NFT_SET_OBJECT) {
6626                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6627                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6628                         return -EINVAL;
6629         } else {
6630                 if (nla[NFTA_SET_ELEM_OBJREF])
6631                         return -EINVAL;
6632         }
6633
6634         if (!nft_setelem_valid_key_end(set, nla, flags))
6635                 return -EINVAL;
6636
6637         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6638              (nla[NFTA_SET_ELEM_DATA] ||
6639               nla[NFTA_SET_ELEM_OBJREF] ||
6640               nla[NFTA_SET_ELEM_TIMEOUT] ||
6641               nla[NFTA_SET_ELEM_EXPIRATION] ||
6642               nla[NFTA_SET_ELEM_USERDATA] ||
6643               nla[NFTA_SET_ELEM_EXPR] ||
6644               nla[NFTA_SET_ELEM_KEY_END] ||
6645               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6646                 return -EINVAL;
6647
6648         timeout = 0;
6649         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6650                 if (!(set->flags & NFT_SET_TIMEOUT))
6651                         return -EINVAL;
6652                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6653                                             &timeout);
6654                 if (err)
6655                         return err;
6656         } else if (set->flags & NFT_SET_TIMEOUT &&
6657                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6658                 timeout = READ_ONCE(set->timeout);
6659         }
6660
6661         expiration = 0;
6662         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6663                 if (!(set->flags & NFT_SET_TIMEOUT))
6664                         return -EINVAL;
6665                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6666                                             &expiration);
6667                 if (err)
6668                         return err;
6669         }
6670
6671         if (nla[NFTA_SET_ELEM_EXPR]) {
6672                 struct nft_expr *expr;
6673
6674                 if (set->num_exprs && set->num_exprs != 1)
6675                         return -EOPNOTSUPP;
6676
6677                 expr = nft_set_elem_expr_alloc(ctx, set,
6678                                                nla[NFTA_SET_ELEM_EXPR]);
6679                 if (IS_ERR(expr))
6680                         return PTR_ERR(expr);
6681
6682                 expr_array[0] = expr;
6683                 num_exprs = 1;
6684
6685                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6686                         err = -EOPNOTSUPP;
6687                         goto err_set_elem_expr;
6688                 }
6689         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6690                 struct nft_expr *expr;
6691                 struct nlattr *tmp;
6692                 int left;
6693
6694                 i = 0;
6695                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6696                         if (i == NFT_SET_EXPR_MAX ||
6697                             (set->num_exprs && set->num_exprs == i)) {
6698                                 err = -E2BIG;
6699                                 goto err_set_elem_expr;
6700                         }
6701                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6702                                 err = -EINVAL;
6703                                 goto err_set_elem_expr;
6704                         }
6705                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6706                         if (IS_ERR(expr)) {
6707                                 err = PTR_ERR(expr);
6708                                 goto err_set_elem_expr;
6709                         }
6710                         expr_array[i] = expr;
6711                         num_exprs++;
6712
6713                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6714                                 err = -EOPNOTSUPP;
6715                                 goto err_set_elem_expr;
6716                         }
6717                         i++;
6718                 }
6719                 if (set->num_exprs && set->num_exprs != i) {
6720                         err = -EOPNOTSUPP;
6721                         goto err_set_elem_expr;
6722                 }
6723         } else if (set->num_exprs > 0 &&
6724                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6725                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6726                 if (err < 0)
6727                         goto err_set_elem_expr_clone;
6728
6729                 num_exprs = set->num_exprs;
6730         }
6731
6732         if (nla[NFTA_SET_ELEM_KEY]) {
6733                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6734                                             nla[NFTA_SET_ELEM_KEY]);
6735                 if (err < 0)
6736                         goto err_set_elem_expr;
6737
6738                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6739                 if (err < 0)
6740                         goto err_parse_key;
6741         }
6742
6743         if (nla[NFTA_SET_ELEM_KEY_END]) {
6744                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6745                                             nla[NFTA_SET_ELEM_KEY_END]);
6746                 if (err < 0)
6747                         goto err_parse_key;
6748
6749                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6750                 if (err < 0)
6751                         goto err_parse_key_end;
6752         }
6753
6754         if (timeout > 0) {
6755                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6756                 if (err < 0)
6757                         goto err_parse_key_end;
6758
6759                 if (timeout != READ_ONCE(set->timeout)) {
6760                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6761                         if (err < 0)
6762                                 goto err_parse_key_end;
6763                 }
6764         }
6765
6766         if (num_exprs) {
6767                 for (i = 0; i < num_exprs; i++)
6768                         size += expr_array[i]->ops->size;
6769
6770                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6771                                              sizeof(struct nft_set_elem_expr) + size);
6772                 if (err < 0)
6773                         goto err_parse_key_end;
6774         }
6775
6776         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6777                 obj = nft_obj_lookup(ctx->net, ctx->table,
6778                                      nla[NFTA_SET_ELEM_OBJREF],
6779                                      set->objtype, genmask);
6780                 if (IS_ERR(obj)) {
6781                         err = PTR_ERR(obj);
6782                         obj = NULL;
6783                         goto err_parse_key_end;
6784                 }
6785
6786                 if (!nft_use_inc(&obj->use)) {
6787                         err = -EMFILE;
6788                         obj = NULL;
6789                         goto err_parse_key_end;
6790                 }
6791
6792                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6793                 if (err < 0)
6794                         goto err_parse_key_end;
6795         }
6796
6797         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6798                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6799                                              nla[NFTA_SET_ELEM_DATA]);
6800                 if (err < 0)
6801                         goto err_parse_key_end;
6802
6803                 dreg = nft_type_to_reg(set->dtype);
6804                 list_for_each_entry(binding, &set->bindings, list) {
6805                         struct nft_ctx bind_ctx = {
6806                                 .net    = ctx->net,
6807                                 .family = ctx->family,
6808                                 .table  = ctx->table,
6809                                 .chain  = (struct nft_chain *)binding->chain,
6810                         };
6811
6812                         if (!(binding->flags & NFT_SET_MAP))
6813                                 continue;
6814
6815                         err = nft_validate_register_store(&bind_ctx, dreg,
6816                                                           &elem.data.val,
6817                                                           desc.type, desc.len);
6818                         if (err < 0)
6819                                 goto err_parse_data;
6820
6821                         if (desc.type == NFT_DATA_VERDICT &&
6822                             (elem.data.val.verdict.code == NFT_GOTO ||
6823                              elem.data.val.verdict.code == NFT_JUMP))
6824                                 nft_validate_state_update(ctx->table,
6825                                                           NFT_VALIDATE_NEED);
6826                 }
6827
6828                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6829                 if (err < 0)
6830                         goto err_parse_data;
6831         }
6832
6833         /* The full maximum length of userdata can exceed the maximum
6834          * offset value (U8_MAX) for following extensions, therefor it
6835          * must be the last extension added.
6836          */
6837         ulen = 0;
6838         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6839                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6840                 if (ulen > 0) {
6841                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6842                                                      ulen);
6843                         if (err < 0)
6844                                 goto err_parse_data;
6845                 }
6846         }
6847
6848         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6849                                       elem.key_end.val.data, elem.data.val.data,
6850                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6851         if (IS_ERR(elem.priv)) {
6852                 err = PTR_ERR(elem.priv);
6853                 goto err_parse_data;
6854         }
6855
6856         ext = nft_set_elem_ext(set, elem.priv);
6857         if (flags)
6858                 *nft_set_ext_flags(ext) = flags;
6859
6860         if (obj)
6861                 *nft_set_ext_obj(ext) = obj;
6862
6863         if (ulen > 0) {
6864                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6865                         err = -EINVAL;
6866                         goto err_elem_free;
6867                 }
6868                 udata = nft_set_ext_userdata(ext);
6869                 udata->len = ulen - 1;
6870                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6871         }
6872         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6873         if (err < 0)
6874                 goto err_elem_free;
6875
6876         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6877         if (trans == NULL) {
6878                 err = -ENOMEM;
6879                 goto err_elem_free;
6880         }
6881
6882         ext->genmask = nft_genmask_cur(ctx->net);
6883
6884         err = nft_setelem_insert(ctx->net, set, &elem, &elem_priv, flags);
6885         if (err) {
6886                 if (err == -EEXIST) {
6887                         ext2 = nft_set_elem_ext(set, elem_priv);
6888                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6889                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6890                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6891                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6892                                 goto err_element_clash;
6893                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6894                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6895                              memcmp(nft_set_ext_data(ext),
6896                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6897                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6898                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6899                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6900                                 goto err_element_clash;
6901                         else if (!(nlmsg_flags & NLM_F_EXCL))
6902                                 err = 0;
6903                 } else if (err == -ENOTEMPTY) {
6904                         /* ENOTEMPTY reports overlapping between this element
6905                          * and an existing one.
6906                          */
6907                         err = -EEXIST;
6908                 }
6909                 goto err_element_clash;
6910         }
6911
6912         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6913                 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6914
6915                 if (!atomic_add_unless(&set->nelems, 1, max)) {
6916                         err = -ENFILE;
6917                         goto err_set_full;
6918                 }
6919         }
6920
6921         nft_trans_elem_priv(trans) = elem.priv;
6922         nft_trans_commit_list_add_tail(ctx->net, trans);
6923         return 0;
6924
6925 err_set_full:
6926         nft_setelem_remove(ctx->net, set, elem.priv);
6927 err_element_clash:
6928         kfree(trans);
6929 err_elem_free:
6930         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6931 err_parse_data:
6932         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6933                 nft_data_release(&elem.data.val, desc.type);
6934 err_parse_key_end:
6935         if (obj)
6936                 nft_use_dec_restore(&obj->use);
6937
6938         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6939 err_parse_key:
6940         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6941 err_set_elem_expr:
6942         for (i = 0; i < num_exprs && expr_array[i]; i++)
6943                 nft_expr_destroy(ctx, expr_array[i]);
6944 err_set_elem_expr_clone:
6945         return err;
6946 }
6947
6948 static int nf_tables_newsetelem(struct sk_buff *skb,
6949                                 const struct nfnl_info *info,
6950                                 const struct nlattr * const nla[])
6951 {
6952         struct netlink_ext_ack *extack = info->extack;
6953         u8 genmask = nft_genmask_next(info->net);
6954         u8 family = info->nfmsg->nfgen_family;
6955         struct net *net = info->net;
6956         const struct nlattr *attr;
6957         struct nft_table *table;
6958         struct nft_set *set;
6959         struct nft_ctx ctx;
6960         int rem, err;
6961
6962         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6963                 return -EINVAL;
6964
6965         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6966                                  genmask, NETLINK_CB(skb).portid);
6967         if (IS_ERR(table)) {
6968                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6969                 return PTR_ERR(table);
6970         }
6971
6972         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6973                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6974         if (IS_ERR(set)) {
6975                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
6976                 return PTR_ERR(set);
6977         }
6978
6979         if (!list_empty(&set->bindings) &&
6980             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6981                 return -EBUSY;
6982
6983         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6984
6985         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6986                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6987                 if (err < 0) {
6988                         NL_SET_BAD_ATTR(extack, attr);
6989                         return err;
6990                 }
6991         }
6992
6993         if (table->validate_state == NFT_VALIDATE_DO)
6994                 return nft_table_validate(net, table);
6995
6996         return 0;
6997 }
6998
6999 /**
7000  *      nft_data_hold - hold a nft_data item
7001  *
7002  *      @data: struct nft_data to release
7003  *      @type: type of data
7004  *
7005  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7006  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
7007  *      NFT_GOTO verdicts. This function must be called on active data objects
7008  *      from the second phase of the commit protocol.
7009  */
7010 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
7011 {
7012         struct nft_chain *chain;
7013
7014         if (type == NFT_DATA_VERDICT) {
7015                 switch (data->verdict.code) {
7016                 case NFT_JUMP:
7017                 case NFT_GOTO:
7018                         chain = data->verdict.chain;
7019                         nft_use_inc_restore(&chain->use);
7020                         break;
7021                 }
7022         }
7023 }
7024
7025 static void nft_setelem_data_activate(const struct net *net,
7026                                       const struct nft_set *set,
7027                                       struct nft_elem_priv *elem_priv)
7028 {
7029         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7030
7031         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7032                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
7033         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7034                 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
7035 }
7036
7037 void nft_setelem_data_deactivate(const struct net *net,
7038                                  const struct nft_set *set,
7039                                  struct nft_elem_priv *elem_priv)
7040 {
7041         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7042
7043         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7044                 nft_data_release(nft_set_ext_data(ext), set->dtype);
7045         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7046                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7047 }
7048
7049 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7050                            const struct nlattr *attr)
7051 {
7052         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7053         struct nft_set_ext_tmpl tmpl;
7054         struct nft_set_elem elem;
7055         struct nft_set_ext *ext;
7056         struct nft_trans *trans;
7057         u32 flags = 0;
7058         int err;
7059
7060         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7061                                           nft_set_elem_policy, NULL);
7062         if (err < 0)
7063                 return err;
7064
7065         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7066         if (err < 0)
7067                 return err;
7068
7069         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7070                 return -EINVAL;
7071
7072         if (!nft_setelem_valid_key_end(set, nla, flags))
7073                 return -EINVAL;
7074
7075         nft_set_ext_prepare(&tmpl);
7076
7077         if (flags != 0) {
7078                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7079                 if (err < 0)
7080                         return err;
7081         }
7082
7083         if (nla[NFTA_SET_ELEM_KEY]) {
7084                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7085                                             nla[NFTA_SET_ELEM_KEY]);
7086                 if (err < 0)
7087                         return err;
7088
7089                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7090                 if (err < 0)
7091                         goto fail_elem;
7092         }
7093
7094         if (nla[NFTA_SET_ELEM_KEY_END]) {
7095                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7096                                             nla[NFTA_SET_ELEM_KEY_END]);
7097                 if (err < 0)
7098                         goto fail_elem;
7099
7100                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7101                 if (err < 0)
7102                         goto fail_elem_key_end;
7103         }
7104
7105         err = -ENOMEM;
7106         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7107                                       elem.key_end.val.data, NULL, 0, 0,
7108                                       GFP_KERNEL_ACCOUNT);
7109         if (IS_ERR(elem.priv)) {
7110                 err = PTR_ERR(elem.priv);
7111                 goto fail_elem_key_end;
7112         }
7113
7114         ext = nft_set_elem_ext(set, elem.priv);
7115         if (flags)
7116                 *nft_set_ext_flags(ext) = flags;
7117
7118         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7119         if (trans == NULL)
7120                 goto fail_trans;
7121
7122         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7123         if (err < 0)
7124                 goto fail_ops;
7125
7126         nft_setelem_data_deactivate(ctx->net, set, elem.priv);
7127
7128         nft_trans_elem_priv(trans) = elem.priv;
7129         nft_trans_commit_list_add_tail(ctx->net, trans);
7130         return 0;
7131
7132 fail_ops:
7133         kfree(trans);
7134 fail_trans:
7135         kfree(elem.priv);
7136 fail_elem_key_end:
7137         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7138 fail_elem:
7139         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7140         return err;
7141 }
7142
7143 static int nft_setelem_flush(const struct nft_ctx *ctx,
7144                              struct nft_set *set,
7145                              const struct nft_set_iter *iter,
7146                              struct nft_elem_priv *elem_priv)
7147 {
7148         struct nft_trans *trans;
7149
7150         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7151                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
7152         if (!trans)
7153                 return -ENOMEM;
7154
7155         set->ops->flush(ctx->net, set, elem_priv);
7156         set->ndeact++;
7157
7158         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7159         nft_trans_elem_set(trans) = set;
7160         nft_trans_elem_priv(trans) = elem_priv;
7161         nft_trans_commit_list_add_tail(ctx->net, trans);
7162
7163         return 0;
7164 }
7165
7166 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7167                                     struct nft_set *set,
7168                                     struct nft_elem_priv *elem_priv)
7169 {
7170         struct nft_trans *trans;
7171
7172         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7173                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
7174         if (!trans)
7175                 return -ENOMEM;
7176
7177         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7178         nft_trans_elem_set(trans) = set;
7179         nft_trans_elem_priv(trans) = elem_priv;
7180         nft_trans_commit_list_add_tail(ctx->net, trans);
7181
7182         return 0;
7183 }
7184
7185 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7186                                   struct nft_set *set)
7187 {
7188         u8 genmask = nft_genmask_next(ctx->net);
7189         struct nft_set_elem_catchall *catchall;
7190         struct nft_set_ext *ext;
7191         int ret = 0;
7192
7193         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7194                 ext = nft_set_elem_ext(set, catchall->elem);
7195                 if (!nft_set_elem_active(ext, genmask))
7196                         continue;
7197
7198                 ret = __nft_set_catchall_flush(ctx, set, catchall->elem);
7199                 if (ret < 0)
7200                         break;
7201                 nft_set_elem_change_active(ctx->net, set, ext);
7202         }
7203
7204         return ret;
7205 }
7206
7207 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7208 {
7209         struct nft_set_iter iter = {
7210                 .genmask        = genmask,
7211                 .fn             = nft_setelem_flush,
7212         };
7213
7214         set->ops->walk(ctx, set, &iter);
7215         if (!iter.err)
7216                 iter.err = nft_set_catchall_flush(ctx, set);
7217
7218         return iter.err;
7219 }
7220
7221 static int nf_tables_delsetelem(struct sk_buff *skb,
7222                                 const struct nfnl_info *info,
7223                                 const struct nlattr * const nla[])
7224 {
7225         struct netlink_ext_ack *extack = info->extack;
7226         u8 genmask = nft_genmask_next(info->net);
7227         u8 family = info->nfmsg->nfgen_family;
7228         struct net *net = info->net;
7229         const struct nlattr *attr;
7230         struct nft_table *table;
7231         struct nft_set *set;
7232         struct nft_ctx ctx;
7233         int rem, err = 0;
7234
7235         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7236                                  genmask, NETLINK_CB(skb).portid);
7237         if (IS_ERR(table)) {
7238                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7239                 return PTR_ERR(table);
7240         }
7241
7242         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7243         if (IS_ERR(set)) {
7244                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7245                 return PTR_ERR(set);
7246         }
7247
7248         if (nft_set_is_anonymous(set))
7249                 return -EOPNOTSUPP;
7250
7251         if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7252                 return -EBUSY;
7253
7254         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7255
7256         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7257                 return nft_set_flush(&ctx, set, genmask);
7258
7259         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7260                 err = nft_del_setelem(&ctx, set, attr);
7261                 if (err == -ENOENT &&
7262                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7263                         continue;
7264
7265                 if (err < 0) {
7266                         NL_SET_BAD_ATTR(extack, attr);
7267                         return err;
7268                 }
7269         }
7270
7271         return 0;
7272 }
7273
7274 /*
7275  * Stateful objects
7276  */
7277
7278 /**
7279  *      nft_register_obj- register nf_tables stateful object type
7280  *      @obj_type: object type
7281  *
7282  *      Registers the object type for use with nf_tables. Returns zero on
7283  *      success or a negative errno code otherwise.
7284  */
7285 int nft_register_obj(struct nft_object_type *obj_type)
7286 {
7287         if (obj_type->type == NFT_OBJECT_UNSPEC)
7288                 return -EINVAL;
7289
7290         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7291         list_add_rcu(&obj_type->list, &nf_tables_objects);
7292         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7293         return 0;
7294 }
7295 EXPORT_SYMBOL_GPL(nft_register_obj);
7296
7297 /**
7298  *      nft_unregister_obj - unregister nf_tables object type
7299  *      @obj_type: object type
7300  *
7301  *      Unregisters the object type for use with nf_tables.
7302  */
7303 void nft_unregister_obj(struct nft_object_type *obj_type)
7304 {
7305         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7306         list_del_rcu(&obj_type->list);
7307         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7308 }
7309 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7310
7311 struct nft_object *nft_obj_lookup(const struct net *net,
7312                                   const struct nft_table *table,
7313                                   const struct nlattr *nla, u32 objtype,
7314                                   u8 genmask)
7315 {
7316         struct nft_object_hash_key k = { .table = table };
7317         char search[NFT_OBJ_MAXNAMELEN];
7318         struct rhlist_head *tmp, *list;
7319         struct nft_object *obj;
7320
7321         nla_strscpy(search, nla, sizeof(search));
7322         k.name = search;
7323
7324         WARN_ON_ONCE(!rcu_read_lock_held() &&
7325                      !lockdep_commit_lock_is_held(net));
7326
7327         rcu_read_lock();
7328         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7329         if (!list)
7330                 goto out;
7331
7332         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7333                 if (objtype == obj->ops->type->type &&
7334                     nft_active_genmask(obj, genmask)) {
7335                         rcu_read_unlock();
7336                         return obj;
7337                 }
7338         }
7339 out:
7340         rcu_read_unlock();
7341         return ERR_PTR(-ENOENT);
7342 }
7343 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7344
7345 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7346                                                   const struct nlattr *nla,
7347                                                   u32 objtype, u8 genmask)
7348 {
7349         struct nft_object *obj;
7350
7351         list_for_each_entry(obj, &table->objects, list) {
7352                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7353                     objtype == obj->ops->type->type &&
7354                     nft_active_genmask(obj, genmask))
7355                         return obj;
7356         }
7357         return ERR_PTR(-ENOENT);
7358 }
7359
7360 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7361         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7362                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7363         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7364                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7365         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7366         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7367         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7368         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7369                                     .len = NFT_USERDATA_MAXLEN },
7370 };
7371
7372 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7373                                        const struct nft_object_type *type,
7374                                        const struct nlattr *attr)
7375 {
7376         struct nlattr **tb;
7377         const struct nft_object_ops *ops;
7378         struct nft_object *obj;
7379         int err = -ENOMEM;
7380
7381         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7382         if (!tb)
7383                 goto err1;
7384
7385         if (attr) {
7386                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7387                                                   type->policy, NULL);
7388                 if (err < 0)
7389                         goto err2;
7390         } else {
7391                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7392         }
7393
7394         if (type->select_ops) {
7395                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7396                 if (IS_ERR(ops)) {
7397                         err = PTR_ERR(ops);
7398                         goto err2;
7399                 }
7400         } else {
7401                 ops = type->ops;
7402         }
7403
7404         err = -ENOMEM;
7405         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7406         if (!obj)
7407                 goto err2;
7408
7409         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7410         if (err < 0)
7411                 goto err3;
7412
7413         obj->ops = ops;
7414
7415         kfree(tb);
7416         return obj;
7417 err3:
7418         kfree(obj);
7419 err2:
7420         kfree(tb);
7421 err1:
7422         return ERR_PTR(err);
7423 }
7424
7425 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7426                            struct nft_object *obj, bool reset)
7427 {
7428         struct nlattr *nest;
7429
7430         nest = nla_nest_start_noflag(skb, attr);
7431         if (!nest)
7432                 goto nla_put_failure;
7433         if (obj->ops->dump(skb, obj, reset) < 0)
7434                 goto nla_put_failure;
7435         nla_nest_end(skb, nest);
7436         return 0;
7437
7438 nla_put_failure:
7439         return -1;
7440 }
7441
7442 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7443 {
7444         const struct nft_object_type *type;
7445
7446         list_for_each_entry(type, &nf_tables_objects, list) {
7447                 if (objtype == type->type)
7448                         return type;
7449         }
7450         return NULL;
7451 }
7452
7453 static const struct nft_object_type *
7454 nft_obj_type_get(struct net *net, u32 objtype)
7455 {
7456         const struct nft_object_type *type;
7457
7458         type = __nft_obj_type_get(objtype);
7459         if (type != NULL && try_module_get(type->owner))
7460                 return type;
7461
7462         lockdep_nfnl_nft_mutex_not_held();
7463 #ifdef CONFIG_MODULES
7464         if (type == NULL) {
7465                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7466                         return ERR_PTR(-EAGAIN);
7467         }
7468 #endif
7469         return ERR_PTR(-ENOENT);
7470 }
7471
7472 static int nf_tables_updobj(const struct nft_ctx *ctx,
7473                             const struct nft_object_type *type,
7474                             const struct nlattr *attr,
7475                             struct nft_object *obj)
7476 {
7477         struct nft_object *newobj;
7478         struct nft_trans *trans;
7479         int err = -ENOMEM;
7480
7481         if (!try_module_get(type->owner))
7482                 return -ENOENT;
7483
7484         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7485                                 sizeof(struct nft_trans_obj));
7486         if (!trans)
7487                 goto err_trans;
7488
7489         newobj = nft_obj_init(ctx, type, attr);
7490         if (IS_ERR(newobj)) {
7491                 err = PTR_ERR(newobj);
7492                 goto err_free_trans;
7493         }
7494
7495         nft_trans_obj(trans) = obj;
7496         nft_trans_obj_update(trans) = true;
7497         nft_trans_obj_newobj(trans) = newobj;
7498         nft_trans_commit_list_add_tail(ctx->net, trans);
7499
7500         return 0;
7501
7502 err_free_trans:
7503         kfree(trans);
7504 err_trans:
7505         module_put(type->owner);
7506         return err;
7507 }
7508
7509 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7510                             const struct nlattr * const nla[])
7511 {
7512         struct netlink_ext_ack *extack = info->extack;
7513         u8 genmask = nft_genmask_next(info->net);
7514         u8 family = info->nfmsg->nfgen_family;
7515         const struct nft_object_type *type;
7516         struct net *net = info->net;
7517         struct nft_table *table;
7518         struct nft_object *obj;
7519         struct nft_ctx ctx;
7520         u32 objtype;
7521         int err;
7522
7523         if (!nla[NFTA_OBJ_TYPE] ||
7524             !nla[NFTA_OBJ_NAME] ||
7525             !nla[NFTA_OBJ_DATA])
7526                 return -EINVAL;
7527
7528         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7529                                  NETLINK_CB(skb).portid);
7530         if (IS_ERR(table)) {
7531                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7532                 return PTR_ERR(table);
7533         }
7534
7535         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7536         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7537         if (IS_ERR(obj)) {
7538                 err = PTR_ERR(obj);
7539                 if (err != -ENOENT) {
7540                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7541                         return err;
7542                 }
7543         } else {
7544                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7545                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7546                         return -EEXIST;
7547                 }
7548                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7549                         return -EOPNOTSUPP;
7550
7551                 type = __nft_obj_type_get(objtype);
7552                 if (WARN_ON_ONCE(!type))
7553                         return -ENOENT;
7554
7555                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7556
7557                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7558         }
7559
7560         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7561
7562         if (!nft_use_inc(&table->use))
7563                 return -EMFILE;
7564
7565         type = nft_obj_type_get(net, objtype);
7566         if (IS_ERR(type)) {
7567                 err = PTR_ERR(type);
7568                 goto err_type;
7569         }
7570
7571         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7572         if (IS_ERR(obj)) {
7573                 err = PTR_ERR(obj);
7574                 goto err_init;
7575         }
7576         obj->key.table = table;
7577         obj->handle = nf_tables_alloc_handle(table);
7578
7579         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7580         if (!obj->key.name) {
7581                 err = -ENOMEM;
7582                 goto err_strdup;
7583         }
7584
7585         if (nla[NFTA_OBJ_USERDATA]) {
7586                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7587                 if (obj->udata == NULL)
7588                         goto err_userdata;
7589
7590                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7591         }
7592
7593         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7594         if (err < 0)
7595                 goto err_trans;
7596
7597         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7598                               nft_objname_ht_params);
7599         if (err < 0)
7600                 goto err_obj_ht;
7601
7602         list_add_tail_rcu(&obj->list, &table->objects);
7603
7604         return 0;
7605 err_obj_ht:
7606         /* queued in transaction log */
7607         INIT_LIST_HEAD(&obj->list);
7608         return err;
7609 err_trans:
7610         kfree(obj->udata);
7611 err_userdata:
7612         kfree(obj->key.name);
7613 err_strdup:
7614         if (obj->ops->destroy)
7615                 obj->ops->destroy(&ctx, obj);
7616         kfree(obj);
7617 err_init:
7618         module_put(type->owner);
7619 err_type:
7620         nft_use_dec_restore(&table->use);
7621
7622         return err;
7623 }
7624
7625 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7626                                    u32 portid, u32 seq, int event, u32 flags,
7627                                    int family, const struct nft_table *table,
7628                                    struct nft_object *obj, bool reset)
7629 {
7630         struct nlmsghdr *nlh;
7631
7632         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7633         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7634                            NFNETLINK_V0, nft_base_seq(net));
7635         if (!nlh)
7636                 goto nla_put_failure;
7637
7638         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7639             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7640             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7641                          NFTA_OBJ_PAD))
7642                 goto nla_put_failure;
7643
7644         if (event == NFT_MSG_DELOBJ) {
7645                 nlmsg_end(skb, nlh);
7646                 return 0;
7647         }
7648
7649         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7650             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7651             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7652                 goto nla_put_failure;
7653
7654         if (obj->udata &&
7655             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7656                 goto nla_put_failure;
7657
7658         nlmsg_end(skb, nlh);
7659         return 0;
7660
7661 nla_put_failure:
7662         nlmsg_trim(skb, nlh);
7663         return -1;
7664 }
7665
7666 static void audit_log_obj_reset(const struct nft_table *table,
7667                                 unsigned int base_seq, unsigned int nentries)
7668 {
7669         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7670
7671         audit_log_nfcfg(buf, table->family, nentries,
7672                         AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7673         kfree(buf);
7674 }
7675
7676 struct nft_obj_dump_ctx {
7677         unsigned int    s_idx;
7678         char            *table;
7679         u32             type;
7680         bool            reset;
7681 };
7682
7683 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7684 {
7685         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7686         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7687         struct net *net = sock_net(skb->sk);
7688         int family = nfmsg->nfgen_family;
7689         struct nftables_pernet *nft_net;
7690         const struct nft_table *table;
7691         unsigned int entries = 0;
7692         struct nft_object *obj;
7693         unsigned int idx = 0;
7694         int rc = 0;
7695
7696         rcu_read_lock();
7697         nft_net = nft_pernet(net);
7698         cb->seq = READ_ONCE(nft_net->base_seq);
7699
7700         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7701                 if (family != NFPROTO_UNSPEC && family != table->family)
7702                         continue;
7703
7704                 entries = 0;
7705                 list_for_each_entry_rcu(obj, &table->objects, list) {
7706                         if (!nft_is_active(net, obj))
7707                                 goto cont;
7708                         if (idx < ctx->s_idx)
7709                                 goto cont;
7710                         if (ctx->table && strcmp(ctx->table, table->name))
7711                                 goto cont;
7712                         if (ctx->type != NFT_OBJECT_UNSPEC &&
7713                             obj->ops->type->type != ctx->type)
7714                                 goto cont;
7715
7716                         rc = nf_tables_fill_obj_info(skb, net,
7717                                                      NETLINK_CB(cb->skb).portid,
7718                                                      cb->nlh->nlmsg_seq,
7719                                                      NFT_MSG_NEWOBJ,
7720                                                      NLM_F_MULTI | NLM_F_APPEND,
7721                                                      table->family, table,
7722                                                      obj, ctx->reset);
7723                         if (rc < 0)
7724                                 break;
7725
7726                         entries++;
7727                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7728 cont:
7729                         idx++;
7730                 }
7731                 if (ctx->reset && entries)
7732                         audit_log_obj_reset(table, nft_net->base_seq, entries);
7733                 if (rc < 0)
7734                         break;
7735         }
7736         rcu_read_unlock();
7737
7738         ctx->s_idx = idx;
7739         return skb->len;
7740 }
7741
7742 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7743 {
7744         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7745         const struct nlattr * const *nla = cb->data;
7746
7747         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
7748
7749         if (nla[NFTA_OBJ_TABLE]) {
7750                 ctx->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7751                 if (!ctx->table)
7752                         return -ENOMEM;
7753         }
7754
7755         if (nla[NFTA_OBJ_TYPE])
7756                 ctx->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7757
7758         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7759                 ctx->reset = true;
7760
7761         return 0;
7762 }
7763
7764 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7765 {
7766         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7767
7768         kfree(ctx->table);
7769
7770         return 0;
7771 }
7772
7773 /* called with rcu_read_lock held */
7774 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7775                             const struct nlattr * const nla[])
7776 {
7777         struct netlink_ext_ack *extack = info->extack;
7778         u8 genmask = nft_genmask_cur(info->net);
7779         u8 family = info->nfmsg->nfgen_family;
7780         const struct nft_table *table;
7781         struct net *net = info->net;
7782         struct nft_object *obj;
7783         struct sk_buff *skb2;
7784         bool reset = false;
7785         u32 objtype;
7786         int err;
7787
7788         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7789                 struct netlink_dump_control c = {
7790                         .start = nf_tables_dump_obj_start,
7791                         .dump = nf_tables_dump_obj,
7792                         .done = nf_tables_dump_obj_done,
7793                         .module = THIS_MODULE,
7794                         .data = (void *)nla,
7795                 };
7796
7797                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7798         }
7799
7800         if (!nla[NFTA_OBJ_NAME] ||
7801             !nla[NFTA_OBJ_TYPE])
7802                 return -EINVAL;
7803
7804         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7805         if (IS_ERR(table)) {
7806                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7807                 return PTR_ERR(table);
7808         }
7809
7810         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7811         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7812         if (IS_ERR(obj)) {
7813                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7814                 return PTR_ERR(obj);
7815         }
7816
7817         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7818         if (!skb2)
7819                 return -ENOMEM;
7820
7821         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7822                 reset = true;
7823
7824         if (reset) {
7825                 const struct nftables_pernet *nft_net;
7826                 char *buf;
7827
7828                 nft_net = nft_pernet(net);
7829                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7830
7831                 audit_log_nfcfg(buf,
7832                                 family,
7833                                 1,
7834                                 AUDIT_NFT_OP_OBJ_RESET,
7835                                 GFP_ATOMIC);
7836                 kfree(buf);
7837         }
7838
7839         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7840                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7841                                       family, table, obj, reset);
7842         if (err < 0)
7843                 goto err_fill_obj_info;
7844
7845         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7846
7847 err_fill_obj_info:
7848         kfree_skb(skb2);
7849         return err;
7850 }
7851
7852 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7853 {
7854         if (obj->ops->destroy)
7855                 obj->ops->destroy(ctx, obj);
7856
7857         module_put(obj->ops->type->owner);
7858         kfree(obj->key.name);
7859         kfree(obj->udata);
7860         kfree(obj);
7861 }
7862
7863 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7864                             const struct nlattr * const nla[])
7865 {
7866         struct netlink_ext_ack *extack = info->extack;
7867         u8 genmask = nft_genmask_next(info->net);
7868         u8 family = info->nfmsg->nfgen_family;
7869         struct net *net = info->net;
7870         const struct nlattr *attr;
7871         struct nft_table *table;
7872         struct nft_object *obj;
7873         struct nft_ctx ctx;
7874         u32 objtype;
7875
7876         if (!nla[NFTA_OBJ_TYPE] ||
7877             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7878                 return -EINVAL;
7879
7880         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7881                                  NETLINK_CB(skb).portid);
7882         if (IS_ERR(table)) {
7883                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7884                 return PTR_ERR(table);
7885         }
7886
7887         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7888         if (nla[NFTA_OBJ_HANDLE]) {
7889                 attr = nla[NFTA_OBJ_HANDLE];
7890                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7891         } else {
7892                 attr = nla[NFTA_OBJ_NAME];
7893                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7894         }
7895
7896         if (IS_ERR(obj)) {
7897                 if (PTR_ERR(obj) == -ENOENT &&
7898                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7899                         return 0;
7900
7901                 NL_SET_BAD_ATTR(extack, attr);
7902                 return PTR_ERR(obj);
7903         }
7904         if (obj->use > 0) {
7905                 NL_SET_BAD_ATTR(extack, attr);
7906                 return -EBUSY;
7907         }
7908
7909         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7910
7911         return nft_delobj(&ctx, obj);
7912 }
7913
7914 static void
7915 __nft_obj_notify(struct net *net, const struct nft_table *table,
7916                  struct nft_object *obj, u32 portid, u32 seq, int event,
7917                  u16 flags, int family, int report, gfp_t gfp)
7918 {
7919         struct nftables_pernet *nft_net = nft_pernet(net);
7920         struct sk_buff *skb;
7921         int err;
7922
7923         if (!report &&
7924             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7925                 return;
7926
7927         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7928         if (skb == NULL)
7929                 goto err;
7930
7931         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7932                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7933                                       family, table, obj, false);
7934         if (err < 0) {
7935                 kfree_skb(skb);
7936                 goto err;
7937         }
7938
7939         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7940         return;
7941 err:
7942         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7943 }
7944
7945 void nft_obj_notify(struct net *net, const struct nft_table *table,
7946                     struct nft_object *obj, u32 portid, u32 seq, int event,
7947                     u16 flags, int family, int report, gfp_t gfp)
7948 {
7949         struct nftables_pernet *nft_net = nft_pernet(net);
7950         char *buf = kasprintf(gfp, "%s:%u",
7951                               table->name, nft_net->base_seq);
7952
7953         audit_log_nfcfg(buf,
7954                         family,
7955                         obj->handle,
7956                         event == NFT_MSG_NEWOBJ ?
7957                                  AUDIT_NFT_OP_OBJ_REGISTER :
7958                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7959                         gfp);
7960         kfree(buf);
7961
7962         __nft_obj_notify(net, table, obj, portid, seq, event,
7963                          flags, family, report, gfp);
7964 }
7965 EXPORT_SYMBOL_GPL(nft_obj_notify);
7966
7967 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7968                                  struct nft_object *obj, int event)
7969 {
7970         __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
7971                          ctx->seq, event, ctx->flags, ctx->family,
7972                          ctx->report, GFP_KERNEL);
7973 }
7974
7975 /*
7976  * Flow tables
7977  */
7978 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7979 {
7980         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7981         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7982         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7983 }
7984 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7985
7986 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7987 {
7988         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7989         list_del_rcu(&type->list);
7990         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7991 }
7992 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7993
7994 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7995         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7996                                             .len = NFT_NAME_MAXLEN - 1 },
7997         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7998                                             .len = NFT_NAME_MAXLEN - 1 },
7999         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
8000         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
8001         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
8002 };
8003
8004 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
8005                                            const struct nlattr *nla, u8 genmask)
8006 {
8007         struct nft_flowtable *flowtable;
8008
8009         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8010                 if (!nla_strcmp(nla, flowtable->name) &&
8011                     nft_active_genmask(flowtable, genmask))
8012                         return flowtable;
8013         }
8014         return ERR_PTR(-ENOENT);
8015 }
8016 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8017
8018 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8019                                     struct nft_flowtable *flowtable,
8020                                     enum nft_trans_phase phase)
8021 {
8022         switch (phase) {
8023         case NFT_TRANS_PREPARE_ERROR:
8024         case NFT_TRANS_PREPARE:
8025         case NFT_TRANS_ABORT:
8026         case NFT_TRANS_RELEASE:
8027                 nft_use_dec(&flowtable->use);
8028                 fallthrough;
8029         default:
8030                 return;
8031         }
8032 }
8033 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8034
8035 static struct nft_flowtable *
8036 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8037                               const struct nlattr *nla, u8 genmask)
8038 {
8039        struct nft_flowtable *flowtable;
8040
8041        list_for_each_entry(flowtable, &table->flowtables, list) {
8042                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8043                    nft_active_genmask(flowtable, genmask))
8044                        return flowtable;
8045        }
8046        return ERR_PTR(-ENOENT);
8047 }
8048
8049 struct nft_flowtable_hook {
8050         u32                     num;
8051         int                     priority;
8052         struct list_head        list;
8053 };
8054
8055 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8056         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
8057         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
8058         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
8059 };
8060
8061 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8062                                     const struct nlattr * const nla[],
8063                                     struct nft_flowtable_hook *flowtable_hook,
8064                                     struct nft_flowtable *flowtable,
8065                                     struct netlink_ext_ack *extack, bool add)
8066 {
8067         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8068         struct nft_hook *hook;
8069         int hooknum, priority;
8070         int err;
8071
8072         INIT_LIST_HEAD(&flowtable_hook->list);
8073
8074         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8075                                           nla[NFTA_FLOWTABLE_HOOK],
8076                                           nft_flowtable_hook_policy, NULL);
8077         if (err < 0)
8078                 return err;
8079
8080         if (add) {
8081                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8082                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8083                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8084                         return -ENOENT;
8085                 }
8086
8087                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8088                 if (hooknum != NF_NETDEV_INGRESS)
8089                         return -EOPNOTSUPP;
8090
8091                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8092
8093                 flowtable_hook->priority        = priority;
8094                 flowtable_hook->num             = hooknum;
8095         } else {
8096                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8097                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8098                         if (hooknum != flowtable->hooknum)
8099                                 return -EOPNOTSUPP;
8100                 }
8101
8102                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8103                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8104                         if (priority != flowtable->data.priority)
8105                                 return -EOPNOTSUPP;
8106                 }
8107
8108                 flowtable_hook->priority        = flowtable->data.priority;
8109                 flowtable_hook->num             = flowtable->hooknum;
8110         }
8111
8112         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8113                 err = nf_tables_parse_netdev_hooks(ctx->net,
8114                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
8115                                                    &flowtable_hook->list,
8116                                                    extack);
8117                 if (err < 0)
8118                         return err;
8119         }
8120
8121         list_for_each_entry(hook, &flowtable_hook->list, list) {
8122                 hook->ops.pf            = NFPROTO_NETDEV;
8123                 hook->ops.hooknum       = flowtable_hook->num;
8124                 hook->ops.priority      = flowtable_hook->priority;
8125                 hook->ops.priv          = &flowtable->data;
8126                 hook->ops.hook          = flowtable->data.type->hook;
8127         }
8128
8129         return err;
8130 }
8131
8132 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8133 {
8134         const struct nf_flowtable_type *type;
8135
8136         list_for_each_entry(type, &nf_tables_flowtables, list) {
8137                 if (family == type->family)
8138                         return type;
8139         }
8140         return NULL;
8141 }
8142
8143 static const struct nf_flowtable_type *
8144 nft_flowtable_type_get(struct net *net, u8 family)
8145 {
8146         const struct nf_flowtable_type *type;
8147
8148         type = __nft_flowtable_type_get(family);
8149         if (type != NULL && try_module_get(type->owner))
8150                 return type;
8151
8152         lockdep_nfnl_nft_mutex_not_held();
8153 #ifdef CONFIG_MODULES
8154         if (type == NULL) {
8155                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8156                         return ERR_PTR(-EAGAIN);
8157         }
8158 #endif
8159         return ERR_PTR(-ENOENT);
8160 }
8161
8162 /* Only called from error and netdev event paths. */
8163 static void nft_unregister_flowtable_hook(struct net *net,
8164                                           struct nft_flowtable *flowtable,
8165                                           struct nft_hook *hook)
8166 {
8167         nf_unregister_net_hook(net, &hook->ops);
8168         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8169                                     FLOW_BLOCK_UNBIND);
8170 }
8171
8172 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8173                                                  struct list_head *hook_list,
8174                                                  bool release_netdev)
8175 {
8176         struct nft_hook *hook, *next;
8177
8178         list_for_each_entry_safe(hook, next, hook_list, list) {
8179                 nf_unregister_net_hook(net, &hook->ops);
8180                 if (release_netdev) {
8181                         list_del(&hook->list);
8182                         kfree_rcu(hook, rcu);
8183                 }
8184         }
8185 }
8186
8187 static void nft_unregister_flowtable_net_hooks(struct net *net,
8188                                                struct list_head *hook_list)
8189 {
8190         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8191 }
8192
8193 static int nft_register_flowtable_net_hooks(struct net *net,
8194                                             struct nft_table *table,
8195                                             struct list_head *hook_list,
8196                                             struct nft_flowtable *flowtable)
8197 {
8198         struct nft_hook *hook, *hook2, *next;
8199         struct nft_flowtable *ft;
8200         int err, i = 0;
8201
8202         list_for_each_entry(hook, hook_list, list) {
8203                 list_for_each_entry(ft, &table->flowtables, list) {
8204                         if (!nft_is_active_next(net, ft))
8205                                 continue;
8206
8207                         list_for_each_entry(hook2, &ft->hook_list, list) {
8208                                 if (hook->ops.dev == hook2->ops.dev &&
8209                                     hook->ops.pf == hook2->ops.pf) {
8210                                         err = -EEXIST;
8211                                         goto err_unregister_net_hooks;
8212                                 }
8213                         }
8214                 }
8215
8216                 err = flowtable->data.type->setup(&flowtable->data,
8217                                                   hook->ops.dev,
8218                                                   FLOW_BLOCK_BIND);
8219                 if (err < 0)
8220                         goto err_unregister_net_hooks;
8221
8222                 err = nf_register_net_hook(net, &hook->ops);
8223                 if (err < 0) {
8224                         flowtable->data.type->setup(&flowtable->data,
8225                                                     hook->ops.dev,
8226                                                     FLOW_BLOCK_UNBIND);
8227                         goto err_unregister_net_hooks;
8228                 }
8229
8230                 i++;
8231         }
8232
8233         return 0;
8234
8235 err_unregister_net_hooks:
8236         list_for_each_entry_safe(hook, next, hook_list, list) {
8237                 if (i-- <= 0)
8238                         break;
8239
8240                 nft_unregister_flowtable_hook(net, flowtable, hook);
8241                 list_del_rcu(&hook->list);
8242                 kfree_rcu(hook, rcu);
8243         }
8244
8245         return err;
8246 }
8247
8248 static void nft_hooks_destroy(struct list_head *hook_list)
8249 {
8250         struct nft_hook *hook, *next;
8251
8252         list_for_each_entry_safe(hook, next, hook_list, list) {
8253                 list_del_rcu(&hook->list);
8254                 kfree_rcu(hook, rcu);
8255         }
8256 }
8257
8258 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8259                                 struct nft_flowtable *flowtable,
8260                                 struct netlink_ext_ack *extack)
8261 {
8262         const struct nlattr * const *nla = ctx->nla;
8263         struct nft_flowtable_hook flowtable_hook;
8264         struct nft_hook *hook, *next;
8265         struct nft_trans *trans;
8266         bool unregister = false;
8267         u32 flags;
8268         int err;
8269
8270         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8271                                        extack, false);
8272         if (err < 0)
8273                 return err;
8274
8275         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8276                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8277                         list_del(&hook->list);
8278                         kfree(hook);
8279                 }
8280         }
8281
8282         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8283                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8284                 if (flags & ~NFT_FLOWTABLE_MASK) {
8285                         err = -EOPNOTSUPP;
8286                         goto err_flowtable_update_hook;
8287                 }
8288                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8289                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8290                         err = -EOPNOTSUPP;
8291                         goto err_flowtable_update_hook;
8292                 }
8293         } else {
8294                 flags = flowtable->data.flags;
8295         }
8296
8297         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8298                                                &flowtable_hook.list, flowtable);
8299         if (err < 0)
8300                 goto err_flowtable_update_hook;
8301
8302         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8303                                 sizeof(struct nft_trans_flowtable));
8304         if (!trans) {
8305                 unregister = true;
8306                 err = -ENOMEM;
8307                 goto err_flowtable_update_hook;
8308         }
8309
8310         nft_trans_flowtable_flags(trans) = flags;
8311         nft_trans_flowtable(trans) = flowtable;
8312         nft_trans_flowtable_update(trans) = true;
8313         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8314         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8315
8316         nft_trans_commit_list_add_tail(ctx->net, trans);
8317
8318         return 0;
8319
8320 err_flowtable_update_hook:
8321         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8322                 if (unregister)
8323                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8324                 list_del_rcu(&hook->list);
8325                 kfree_rcu(hook, rcu);
8326         }
8327
8328         return err;
8329
8330 }
8331
8332 static int nf_tables_newflowtable(struct sk_buff *skb,
8333                                   const struct nfnl_info *info,
8334                                   const struct nlattr * const nla[])
8335 {
8336         struct netlink_ext_ack *extack = info->extack;
8337         struct nft_flowtable_hook flowtable_hook;
8338         u8 genmask = nft_genmask_next(info->net);
8339         u8 family = info->nfmsg->nfgen_family;
8340         const struct nf_flowtable_type *type;
8341         struct nft_flowtable *flowtable;
8342         struct nft_hook *hook, *next;
8343         struct net *net = info->net;
8344         struct nft_table *table;
8345         struct nft_ctx ctx;
8346         int err;
8347
8348         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8349             !nla[NFTA_FLOWTABLE_NAME] ||
8350             !nla[NFTA_FLOWTABLE_HOOK])
8351                 return -EINVAL;
8352
8353         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8354                                  genmask, NETLINK_CB(skb).portid);
8355         if (IS_ERR(table)) {
8356                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8357                 return PTR_ERR(table);
8358         }
8359
8360         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8361                                          genmask);
8362         if (IS_ERR(flowtable)) {
8363                 err = PTR_ERR(flowtable);
8364                 if (err != -ENOENT) {
8365                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8366                         return err;
8367                 }
8368         } else {
8369                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8370                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8371                         return -EEXIST;
8372                 }
8373
8374                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8375
8376                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8377         }
8378
8379         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8380
8381         if (!nft_use_inc(&table->use))
8382                 return -EMFILE;
8383
8384         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8385         if (!flowtable) {
8386                 err = -ENOMEM;
8387                 goto flowtable_alloc;
8388         }
8389
8390         flowtable->table = table;
8391         flowtable->handle = nf_tables_alloc_handle(table);
8392         INIT_LIST_HEAD(&flowtable->hook_list);
8393
8394         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8395         if (!flowtable->name) {
8396                 err = -ENOMEM;
8397                 goto err1;
8398         }
8399
8400         type = nft_flowtable_type_get(net, family);
8401         if (IS_ERR(type)) {
8402                 err = PTR_ERR(type);
8403                 goto err2;
8404         }
8405
8406         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8407                 flowtable->data.flags =
8408                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8409                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8410                         err = -EOPNOTSUPP;
8411                         goto err3;
8412                 }
8413         }
8414
8415         write_pnet(&flowtable->data.net, net);
8416         flowtable->data.type = type;
8417         err = type->init(&flowtable->data);
8418         if (err < 0)
8419                 goto err3;
8420
8421         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8422                                        extack, true);
8423         if (err < 0)
8424                 goto err4;
8425
8426         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8427         flowtable->data.priority = flowtable_hook.priority;
8428         flowtable->hooknum = flowtable_hook.num;
8429
8430         err = nft_register_flowtable_net_hooks(ctx.net, table,
8431                                                &flowtable->hook_list,
8432                                                flowtable);
8433         if (err < 0) {
8434                 nft_hooks_destroy(&flowtable->hook_list);
8435                 goto err4;
8436         }
8437
8438         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8439         if (err < 0)
8440                 goto err5;
8441
8442         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8443
8444         return 0;
8445 err5:
8446         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8447                 nft_unregister_flowtable_hook(net, flowtable, hook);
8448                 list_del_rcu(&hook->list);
8449                 kfree_rcu(hook, rcu);
8450         }
8451 err4:
8452         flowtable->data.type->free(&flowtable->data);
8453 err3:
8454         module_put(type->owner);
8455 err2:
8456         kfree(flowtable->name);
8457 err1:
8458         kfree(flowtable);
8459 flowtable_alloc:
8460         nft_use_dec_restore(&table->use);
8461
8462         return err;
8463 }
8464
8465 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8466 {
8467         struct nft_hook *this, *next;
8468
8469         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8470                 list_del(&this->list);
8471                 kfree(this);
8472         }
8473 }
8474
8475 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8476                                  struct nft_flowtable *flowtable,
8477                                  struct netlink_ext_ack *extack)
8478 {
8479         const struct nlattr * const *nla = ctx->nla;
8480         struct nft_flowtable_hook flowtable_hook;
8481         LIST_HEAD(flowtable_del_list);
8482         struct nft_hook *this, *hook;
8483         struct nft_trans *trans;
8484         int err;
8485
8486         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8487                                        extack, false);
8488         if (err < 0)
8489                 return err;
8490
8491         list_for_each_entry(this, &flowtable_hook.list, list) {
8492                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8493                 if (!hook) {
8494                         err = -ENOENT;
8495                         goto err_flowtable_del_hook;
8496                 }
8497                 list_move(&hook->list, &flowtable_del_list);
8498         }
8499
8500         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8501                                 sizeof(struct nft_trans_flowtable));
8502         if (!trans) {
8503                 err = -ENOMEM;
8504                 goto err_flowtable_del_hook;
8505         }
8506
8507         nft_trans_flowtable(trans) = flowtable;
8508         nft_trans_flowtable_update(trans) = true;
8509         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8510         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8511         nft_flowtable_hook_release(&flowtable_hook);
8512
8513         nft_trans_commit_list_add_tail(ctx->net, trans);
8514
8515         return 0;
8516
8517 err_flowtable_del_hook:
8518         list_splice(&flowtable_del_list, &flowtable->hook_list);
8519         nft_flowtable_hook_release(&flowtable_hook);
8520
8521         return err;
8522 }
8523
8524 static int nf_tables_delflowtable(struct sk_buff *skb,
8525                                   const struct nfnl_info *info,
8526                                   const struct nlattr * const nla[])
8527 {
8528         struct netlink_ext_ack *extack = info->extack;
8529         u8 genmask = nft_genmask_next(info->net);
8530         u8 family = info->nfmsg->nfgen_family;
8531         struct nft_flowtable *flowtable;
8532         struct net *net = info->net;
8533         const struct nlattr *attr;
8534         struct nft_table *table;
8535         struct nft_ctx ctx;
8536
8537         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8538             (!nla[NFTA_FLOWTABLE_NAME] &&
8539              !nla[NFTA_FLOWTABLE_HANDLE]))
8540                 return -EINVAL;
8541
8542         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8543                                  genmask, NETLINK_CB(skb).portid);
8544         if (IS_ERR(table)) {
8545                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8546                 return PTR_ERR(table);
8547         }
8548
8549         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8550                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8551                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8552         } else {
8553                 attr = nla[NFTA_FLOWTABLE_NAME];
8554                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8555         }
8556
8557         if (IS_ERR(flowtable)) {
8558                 if (PTR_ERR(flowtable) == -ENOENT &&
8559                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8560                         return 0;
8561
8562                 NL_SET_BAD_ATTR(extack, attr);
8563                 return PTR_ERR(flowtable);
8564         }
8565
8566         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8567
8568         if (nla[NFTA_FLOWTABLE_HOOK])
8569                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8570
8571         if (flowtable->use > 0) {
8572                 NL_SET_BAD_ATTR(extack, attr);
8573                 return -EBUSY;
8574         }
8575
8576         return nft_delflowtable(&ctx, flowtable);
8577 }
8578
8579 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8580                                          u32 portid, u32 seq, int event,
8581                                          u32 flags, int family,
8582                                          struct nft_flowtable *flowtable,
8583                                          struct list_head *hook_list)
8584 {
8585         struct nlattr *nest, *nest_devs;
8586         struct nft_hook *hook;
8587         struct nlmsghdr *nlh;
8588
8589         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8590         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8591                            NFNETLINK_V0, nft_base_seq(net));
8592         if (!nlh)
8593                 goto nla_put_failure;
8594
8595         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8596             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8597             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8598                          NFTA_FLOWTABLE_PAD))
8599                 goto nla_put_failure;
8600
8601         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8602                 nlmsg_end(skb, nlh);
8603                 return 0;
8604         }
8605
8606         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8607             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8608                 goto nla_put_failure;
8609
8610         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8611         if (!nest)
8612                 goto nla_put_failure;
8613         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8614             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8615                 goto nla_put_failure;
8616
8617         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8618         if (!nest_devs)
8619                 goto nla_put_failure;
8620
8621         if (!hook_list)
8622                 hook_list = &flowtable->hook_list;
8623
8624         list_for_each_entry_rcu(hook, hook_list, list) {
8625                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8626                         goto nla_put_failure;
8627         }
8628         nla_nest_end(skb, nest_devs);
8629         nla_nest_end(skb, nest);
8630
8631         nlmsg_end(skb, nlh);
8632         return 0;
8633
8634 nla_put_failure:
8635         nlmsg_trim(skb, nlh);
8636         return -1;
8637 }
8638
8639 struct nft_flowtable_filter {
8640         char            *table;
8641 };
8642
8643 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8644                                     struct netlink_callback *cb)
8645 {
8646         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8647         struct nft_flowtable_filter *filter = cb->data;
8648         unsigned int idx = 0, s_idx = cb->args[0];
8649         struct net *net = sock_net(skb->sk);
8650         int family = nfmsg->nfgen_family;
8651         struct nft_flowtable *flowtable;
8652         struct nftables_pernet *nft_net;
8653         const struct nft_table *table;
8654
8655         rcu_read_lock();
8656         nft_net = nft_pernet(net);
8657         cb->seq = READ_ONCE(nft_net->base_seq);
8658
8659         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8660                 if (family != NFPROTO_UNSPEC && family != table->family)
8661                         continue;
8662
8663                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8664                         if (!nft_is_active(net, flowtable))
8665                                 goto cont;
8666                         if (idx < s_idx)
8667                                 goto cont;
8668                         if (idx > s_idx)
8669                                 memset(&cb->args[1], 0,
8670                                        sizeof(cb->args) - sizeof(cb->args[0]));
8671                         if (filter && filter->table &&
8672                             strcmp(filter->table, table->name))
8673                                 goto cont;
8674
8675                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8676                                                           cb->nlh->nlmsg_seq,
8677                                                           NFT_MSG_NEWFLOWTABLE,
8678                                                           NLM_F_MULTI | NLM_F_APPEND,
8679                                                           table->family,
8680                                                           flowtable, NULL) < 0)
8681                                 goto done;
8682
8683                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8684 cont:
8685                         idx++;
8686                 }
8687         }
8688 done:
8689         rcu_read_unlock();
8690
8691         cb->args[0] = idx;
8692         return skb->len;
8693 }
8694
8695 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8696 {
8697         const struct nlattr * const *nla = cb->data;
8698         struct nft_flowtable_filter *filter = NULL;
8699
8700         if (nla[NFTA_FLOWTABLE_TABLE]) {
8701                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8702                 if (!filter)
8703                         return -ENOMEM;
8704
8705                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8706                                            GFP_ATOMIC);
8707                 if (!filter->table) {
8708                         kfree(filter);
8709                         return -ENOMEM;
8710                 }
8711         }
8712
8713         cb->data = filter;
8714         return 0;
8715 }
8716
8717 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8718 {
8719         struct nft_flowtable_filter *filter = cb->data;
8720
8721         if (!filter)
8722                 return 0;
8723
8724         kfree(filter->table);
8725         kfree(filter);
8726
8727         return 0;
8728 }
8729
8730 /* called with rcu_read_lock held */
8731 static int nf_tables_getflowtable(struct sk_buff *skb,
8732                                   const struct nfnl_info *info,
8733                                   const struct nlattr * const nla[])
8734 {
8735         struct netlink_ext_ack *extack = info->extack;
8736         u8 genmask = nft_genmask_cur(info->net);
8737         u8 family = info->nfmsg->nfgen_family;
8738         struct nft_flowtable *flowtable;
8739         const struct nft_table *table;
8740         struct net *net = info->net;
8741         struct sk_buff *skb2;
8742         int err;
8743
8744         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8745                 struct netlink_dump_control c = {
8746                         .start = nf_tables_dump_flowtable_start,
8747                         .dump = nf_tables_dump_flowtable,
8748                         .done = nf_tables_dump_flowtable_done,
8749                         .module = THIS_MODULE,
8750                         .data = (void *)nla,
8751                 };
8752
8753                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8754         }
8755
8756         if (!nla[NFTA_FLOWTABLE_NAME])
8757                 return -EINVAL;
8758
8759         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8760                                  genmask, 0);
8761         if (IS_ERR(table)) {
8762                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8763                 return PTR_ERR(table);
8764         }
8765
8766         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8767                                          genmask);
8768         if (IS_ERR(flowtable)) {
8769                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8770                 return PTR_ERR(flowtable);
8771         }
8772
8773         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8774         if (!skb2)
8775                 return -ENOMEM;
8776
8777         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8778                                             info->nlh->nlmsg_seq,
8779                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8780                                             flowtable, NULL);
8781         if (err < 0)
8782                 goto err_fill_flowtable_info;
8783
8784         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8785
8786 err_fill_flowtable_info:
8787         kfree_skb(skb2);
8788         return err;
8789 }
8790
8791 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8792                                        struct nft_flowtable *flowtable,
8793                                        struct list_head *hook_list, int event)
8794 {
8795         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8796         struct sk_buff *skb;
8797         u16 flags = 0;
8798         int err;
8799
8800         if (!ctx->report &&
8801             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8802                 return;
8803
8804         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8805         if (skb == NULL)
8806                 goto err;
8807
8808         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8809                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8810
8811         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8812                                             ctx->seq, event, flags,
8813                                             ctx->family, flowtable, hook_list);
8814         if (err < 0) {
8815                 kfree_skb(skb);
8816                 goto err;
8817         }
8818
8819         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8820         return;
8821 err:
8822         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8823 }
8824
8825 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8826 {
8827         struct nft_hook *hook, *next;
8828
8829         flowtable->data.type->free(&flowtable->data);
8830         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8831                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8832                                             FLOW_BLOCK_UNBIND);
8833                 list_del_rcu(&hook->list);
8834                 kfree(hook);
8835         }
8836         kfree(flowtable->name);
8837         module_put(flowtable->data.type->owner);
8838         kfree(flowtable);
8839 }
8840
8841 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8842                                    u32 portid, u32 seq)
8843 {
8844         struct nftables_pernet *nft_net = nft_pernet(net);
8845         struct nlmsghdr *nlh;
8846         char buf[TASK_COMM_LEN];
8847         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8848
8849         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8850                            NFNETLINK_V0, nft_base_seq(net));
8851         if (!nlh)
8852                 goto nla_put_failure;
8853
8854         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8855             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8856             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8857                 goto nla_put_failure;
8858
8859         nlmsg_end(skb, nlh);
8860         return 0;
8861
8862 nla_put_failure:
8863         nlmsg_trim(skb, nlh);
8864         return -EMSGSIZE;
8865 }
8866
8867 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8868                                 struct nft_flowtable *flowtable)
8869 {
8870         struct nft_hook *hook;
8871
8872         list_for_each_entry(hook, &flowtable->hook_list, list) {
8873                 if (hook->ops.dev != dev)
8874                         continue;
8875
8876                 /* flow_offload_netdev_event() cleans up entries for us. */
8877                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8878                 list_del_rcu(&hook->list);
8879                 kfree_rcu(hook, rcu);
8880                 break;
8881         }
8882 }
8883
8884 static int nf_tables_flowtable_event(struct notifier_block *this,
8885                                      unsigned long event, void *ptr)
8886 {
8887         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8888         struct nft_flowtable *flowtable;
8889         struct nftables_pernet *nft_net;
8890         struct nft_table *table;
8891         struct net *net;
8892
8893         if (event != NETDEV_UNREGISTER)
8894                 return 0;
8895
8896         net = dev_net(dev);
8897         nft_net = nft_pernet(net);
8898         mutex_lock(&nft_net->commit_mutex);
8899         list_for_each_entry(table, &nft_net->tables, list) {
8900                 list_for_each_entry(flowtable, &table->flowtables, list) {
8901                         nft_flowtable_event(event, dev, flowtable);
8902                 }
8903         }
8904         mutex_unlock(&nft_net->commit_mutex);
8905
8906         return NOTIFY_DONE;
8907 }
8908
8909 static struct notifier_block nf_tables_flowtable_notifier = {
8910         .notifier_call  = nf_tables_flowtable_event,
8911 };
8912
8913 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8914                                  int event)
8915 {
8916         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8917         struct sk_buff *skb2;
8918         int err;
8919
8920         if (!nlmsg_report(nlh) &&
8921             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8922                 return;
8923
8924         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8925         if (skb2 == NULL)
8926                 goto err;
8927
8928         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8929                                       nlh->nlmsg_seq);
8930         if (err < 0) {
8931                 kfree_skb(skb2);
8932                 goto err;
8933         }
8934
8935         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8936                        nlmsg_report(nlh), GFP_KERNEL);
8937         return;
8938 err:
8939         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8940                           -ENOBUFS);
8941 }
8942
8943 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8944                             const struct nlattr * const nla[])
8945 {
8946         struct sk_buff *skb2;
8947         int err;
8948
8949         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8950         if (skb2 == NULL)
8951                 return -ENOMEM;
8952
8953         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8954                                       info->nlh->nlmsg_seq);
8955         if (err < 0)
8956                 goto err_fill_gen_info;
8957
8958         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8959
8960 err_fill_gen_info:
8961         kfree_skb(skb2);
8962         return err;
8963 }
8964
8965 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8966         [NFT_MSG_NEWTABLE] = {
8967                 .call           = nf_tables_newtable,
8968                 .type           = NFNL_CB_BATCH,
8969                 .attr_count     = NFTA_TABLE_MAX,
8970                 .policy         = nft_table_policy,
8971         },
8972         [NFT_MSG_GETTABLE] = {
8973                 .call           = nf_tables_gettable,
8974                 .type           = NFNL_CB_RCU,
8975                 .attr_count     = NFTA_TABLE_MAX,
8976                 .policy         = nft_table_policy,
8977         },
8978         [NFT_MSG_DELTABLE] = {
8979                 .call           = nf_tables_deltable,
8980                 .type           = NFNL_CB_BATCH,
8981                 .attr_count     = NFTA_TABLE_MAX,
8982                 .policy         = nft_table_policy,
8983         },
8984         [NFT_MSG_DESTROYTABLE] = {
8985                 .call           = nf_tables_deltable,
8986                 .type           = NFNL_CB_BATCH,
8987                 .attr_count     = NFTA_TABLE_MAX,
8988                 .policy         = nft_table_policy,
8989         },
8990         [NFT_MSG_NEWCHAIN] = {
8991                 .call           = nf_tables_newchain,
8992                 .type           = NFNL_CB_BATCH,
8993                 .attr_count     = NFTA_CHAIN_MAX,
8994                 .policy         = nft_chain_policy,
8995         },
8996         [NFT_MSG_GETCHAIN] = {
8997                 .call           = nf_tables_getchain,
8998                 .type           = NFNL_CB_RCU,
8999                 .attr_count     = NFTA_CHAIN_MAX,
9000                 .policy         = nft_chain_policy,
9001         },
9002         [NFT_MSG_DELCHAIN] = {
9003                 .call           = nf_tables_delchain,
9004                 .type           = NFNL_CB_BATCH,
9005                 .attr_count     = NFTA_CHAIN_MAX,
9006                 .policy         = nft_chain_policy,
9007         },
9008         [NFT_MSG_DESTROYCHAIN] = {
9009                 .call           = nf_tables_delchain,
9010                 .type           = NFNL_CB_BATCH,
9011                 .attr_count     = NFTA_CHAIN_MAX,
9012                 .policy         = nft_chain_policy,
9013         },
9014         [NFT_MSG_NEWRULE] = {
9015                 .call           = nf_tables_newrule,
9016                 .type           = NFNL_CB_BATCH,
9017                 .attr_count     = NFTA_RULE_MAX,
9018                 .policy         = nft_rule_policy,
9019         },
9020         [NFT_MSG_GETRULE] = {
9021                 .call           = nf_tables_getrule,
9022                 .type           = NFNL_CB_RCU,
9023                 .attr_count     = NFTA_RULE_MAX,
9024                 .policy         = nft_rule_policy,
9025         },
9026         [NFT_MSG_GETRULE_RESET] = {
9027                 .call           = nf_tables_getrule_reset,
9028                 .type           = NFNL_CB_RCU,
9029                 .attr_count     = NFTA_RULE_MAX,
9030                 .policy         = nft_rule_policy,
9031         },
9032         [NFT_MSG_DELRULE] = {
9033                 .call           = nf_tables_delrule,
9034                 .type           = NFNL_CB_BATCH,
9035                 .attr_count     = NFTA_RULE_MAX,
9036                 .policy         = nft_rule_policy,
9037         },
9038         [NFT_MSG_DESTROYRULE] = {
9039                 .call           = nf_tables_delrule,
9040                 .type           = NFNL_CB_BATCH,
9041                 .attr_count     = NFTA_RULE_MAX,
9042                 .policy         = nft_rule_policy,
9043         },
9044         [NFT_MSG_NEWSET] = {
9045                 .call           = nf_tables_newset,
9046                 .type           = NFNL_CB_BATCH,
9047                 .attr_count     = NFTA_SET_MAX,
9048                 .policy         = nft_set_policy,
9049         },
9050         [NFT_MSG_GETSET] = {
9051                 .call           = nf_tables_getset,
9052                 .type           = NFNL_CB_RCU,
9053                 .attr_count     = NFTA_SET_MAX,
9054                 .policy         = nft_set_policy,
9055         },
9056         [NFT_MSG_DELSET] = {
9057                 .call           = nf_tables_delset,
9058                 .type           = NFNL_CB_BATCH,
9059                 .attr_count     = NFTA_SET_MAX,
9060                 .policy         = nft_set_policy,
9061         },
9062         [NFT_MSG_DESTROYSET] = {
9063                 .call           = nf_tables_delset,
9064                 .type           = NFNL_CB_BATCH,
9065                 .attr_count     = NFTA_SET_MAX,
9066                 .policy         = nft_set_policy,
9067         },
9068         [NFT_MSG_NEWSETELEM] = {
9069                 .call           = nf_tables_newsetelem,
9070                 .type           = NFNL_CB_BATCH,
9071                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9072                 .policy         = nft_set_elem_list_policy,
9073         },
9074         [NFT_MSG_GETSETELEM] = {
9075                 .call           = nf_tables_getsetelem,
9076                 .type           = NFNL_CB_RCU,
9077                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9078                 .policy         = nft_set_elem_list_policy,
9079         },
9080         [NFT_MSG_GETSETELEM_RESET] = {
9081                 .call           = nf_tables_getsetelem,
9082                 .type           = NFNL_CB_RCU,
9083                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9084                 .policy         = nft_set_elem_list_policy,
9085         },
9086         [NFT_MSG_DELSETELEM] = {
9087                 .call           = nf_tables_delsetelem,
9088                 .type           = NFNL_CB_BATCH,
9089                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9090                 .policy         = nft_set_elem_list_policy,
9091         },
9092         [NFT_MSG_DESTROYSETELEM] = {
9093                 .call           = nf_tables_delsetelem,
9094                 .type           = NFNL_CB_BATCH,
9095                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9096                 .policy         = nft_set_elem_list_policy,
9097         },
9098         [NFT_MSG_GETGEN] = {
9099                 .call           = nf_tables_getgen,
9100                 .type           = NFNL_CB_RCU,
9101         },
9102         [NFT_MSG_NEWOBJ] = {
9103                 .call           = nf_tables_newobj,
9104                 .type           = NFNL_CB_BATCH,
9105                 .attr_count     = NFTA_OBJ_MAX,
9106                 .policy         = nft_obj_policy,
9107         },
9108         [NFT_MSG_GETOBJ] = {
9109                 .call           = nf_tables_getobj,
9110                 .type           = NFNL_CB_RCU,
9111                 .attr_count     = NFTA_OBJ_MAX,
9112                 .policy         = nft_obj_policy,
9113         },
9114         [NFT_MSG_DELOBJ] = {
9115                 .call           = nf_tables_delobj,
9116                 .type           = NFNL_CB_BATCH,
9117                 .attr_count     = NFTA_OBJ_MAX,
9118                 .policy         = nft_obj_policy,
9119         },
9120         [NFT_MSG_DESTROYOBJ] = {
9121                 .call           = nf_tables_delobj,
9122                 .type           = NFNL_CB_BATCH,
9123                 .attr_count     = NFTA_OBJ_MAX,
9124                 .policy         = nft_obj_policy,
9125         },
9126         [NFT_MSG_GETOBJ_RESET] = {
9127                 .call           = nf_tables_getobj,
9128                 .type           = NFNL_CB_RCU,
9129                 .attr_count     = NFTA_OBJ_MAX,
9130                 .policy         = nft_obj_policy,
9131         },
9132         [NFT_MSG_NEWFLOWTABLE] = {
9133                 .call           = nf_tables_newflowtable,
9134                 .type           = NFNL_CB_BATCH,
9135                 .attr_count     = NFTA_FLOWTABLE_MAX,
9136                 .policy         = nft_flowtable_policy,
9137         },
9138         [NFT_MSG_GETFLOWTABLE] = {
9139                 .call           = nf_tables_getflowtable,
9140                 .type           = NFNL_CB_RCU,
9141                 .attr_count     = NFTA_FLOWTABLE_MAX,
9142                 .policy         = nft_flowtable_policy,
9143         },
9144         [NFT_MSG_DELFLOWTABLE] = {
9145                 .call           = nf_tables_delflowtable,
9146                 .type           = NFNL_CB_BATCH,
9147                 .attr_count     = NFTA_FLOWTABLE_MAX,
9148                 .policy         = nft_flowtable_policy,
9149         },
9150         [NFT_MSG_DESTROYFLOWTABLE] = {
9151                 .call           = nf_tables_delflowtable,
9152                 .type           = NFNL_CB_BATCH,
9153                 .attr_count     = NFTA_FLOWTABLE_MAX,
9154                 .policy         = nft_flowtable_policy,
9155         },
9156 };
9157
9158 static int nf_tables_validate(struct net *net)
9159 {
9160         struct nftables_pernet *nft_net = nft_pernet(net);
9161         struct nft_table *table;
9162
9163         list_for_each_entry(table, &nft_net->tables, list) {
9164                 switch (table->validate_state) {
9165                 case NFT_VALIDATE_SKIP:
9166                         continue;
9167                 case NFT_VALIDATE_NEED:
9168                         nft_validate_state_update(table, NFT_VALIDATE_DO);
9169                         fallthrough;
9170                 case NFT_VALIDATE_DO:
9171                         if (nft_table_validate(net, table) < 0)
9172                                 return -EAGAIN;
9173
9174                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9175                         break;
9176                 }
9177         }
9178
9179         return 0;
9180 }
9181
9182 /* a drop policy has to be deferred until all rules have been activated,
9183  * otherwise a large ruleset that contains a drop-policy base chain will
9184  * cause all packets to get dropped until the full transaction has been
9185  * processed.
9186  *
9187  * We defer the drop policy until the transaction has been finalized.
9188  */
9189 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9190 {
9191         struct nft_base_chain *basechain;
9192
9193         if (nft_trans_chain_policy(trans) != NF_DROP)
9194                 return;
9195
9196         if (!nft_is_base_chain(trans->ctx.chain))
9197                 return;
9198
9199         basechain = nft_base_chain(trans->ctx.chain);
9200         basechain->policy = NF_DROP;
9201 }
9202
9203 static void nft_chain_commit_update(struct nft_trans *trans)
9204 {
9205         struct nft_base_chain *basechain;
9206
9207         if (nft_trans_chain_name(trans)) {
9208                 rhltable_remove(&trans->ctx.table->chains_ht,
9209                                 &trans->ctx.chain->rhlhead,
9210                                 nft_chain_ht_params);
9211                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9212                 rhltable_insert_key(&trans->ctx.table->chains_ht,
9213                                     trans->ctx.chain->name,
9214                                     &trans->ctx.chain->rhlhead,
9215                                     nft_chain_ht_params);
9216         }
9217
9218         if (!nft_is_base_chain(trans->ctx.chain))
9219                 return;
9220
9221         nft_chain_stats_replace(trans);
9222
9223         basechain = nft_base_chain(trans->ctx.chain);
9224
9225         switch (nft_trans_chain_policy(trans)) {
9226         case NF_DROP:
9227         case NF_ACCEPT:
9228                 basechain->policy = nft_trans_chain_policy(trans);
9229                 break;
9230         }
9231 }
9232
9233 static void nft_obj_commit_update(struct nft_trans *trans)
9234 {
9235         struct nft_object *newobj;
9236         struct nft_object *obj;
9237
9238         obj = nft_trans_obj(trans);
9239         newobj = nft_trans_obj_newobj(trans);
9240
9241         if (obj->ops->update)
9242                 obj->ops->update(obj, newobj);
9243
9244         nft_obj_destroy(&trans->ctx, newobj);
9245 }
9246
9247 static void nft_commit_release(struct nft_trans *trans)
9248 {
9249         switch (trans->msg_type) {
9250         case NFT_MSG_DELTABLE:
9251         case NFT_MSG_DESTROYTABLE:
9252                 nf_tables_table_destroy(&trans->ctx);
9253                 break;
9254         case NFT_MSG_NEWCHAIN:
9255                 free_percpu(nft_trans_chain_stats(trans));
9256                 kfree(nft_trans_chain_name(trans));
9257                 break;
9258         case NFT_MSG_DELCHAIN:
9259         case NFT_MSG_DESTROYCHAIN:
9260                 if (nft_trans_chain_update(trans))
9261                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9262                 else
9263                         nf_tables_chain_destroy(&trans->ctx);
9264                 break;
9265         case NFT_MSG_DELRULE:
9266         case NFT_MSG_DESTROYRULE:
9267                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9268                 break;
9269         case NFT_MSG_DELSET:
9270         case NFT_MSG_DESTROYSET:
9271                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9272                 break;
9273         case NFT_MSG_DELSETELEM:
9274         case NFT_MSG_DESTROYSETELEM:
9275                 nf_tables_set_elem_destroy(&trans->ctx,
9276                                            nft_trans_elem_set(trans),
9277                                            nft_trans_elem_priv(trans));
9278                 break;
9279         case NFT_MSG_DELOBJ:
9280         case NFT_MSG_DESTROYOBJ:
9281                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9282                 break;
9283         case NFT_MSG_DELFLOWTABLE:
9284         case NFT_MSG_DESTROYFLOWTABLE:
9285                 if (nft_trans_flowtable_update(trans))
9286                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9287                 else
9288                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9289                 break;
9290         }
9291
9292         if (trans->put_net)
9293                 put_net(trans->ctx.net);
9294
9295         kfree(trans);
9296 }
9297
9298 static void nf_tables_trans_destroy_work(struct work_struct *w)
9299 {
9300         struct nft_trans *trans, *next;
9301         LIST_HEAD(head);
9302
9303         spin_lock(&nf_tables_destroy_list_lock);
9304         list_splice_init(&nf_tables_destroy_list, &head);
9305         spin_unlock(&nf_tables_destroy_list_lock);
9306
9307         if (list_empty(&head))
9308                 return;
9309
9310         synchronize_rcu();
9311
9312         list_for_each_entry_safe(trans, next, &head, list) {
9313                 nft_trans_list_del(trans);
9314                 nft_commit_release(trans);
9315         }
9316 }
9317
9318 void nf_tables_trans_destroy_flush_work(void)
9319 {
9320         flush_work(&trans_destroy_work);
9321 }
9322 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9323
9324 static bool nft_expr_reduce(struct nft_regs_track *track,
9325                             const struct nft_expr *expr)
9326 {
9327         return false;
9328 }
9329
9330 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9331 {
9332         const struct nft_expr *expr, *last;
9333         struct nft_regs_track track = {};
9334         unsigned int size, data_size;
9335         void *data, *data_boundary;
9336         struct nft_rule_dp *prule;
9337         struct nft_rule *rule;
9338
9339         /* already handled or inactive chain? */
9340         if (chain->blob_next || !nft_is_active_next(net, chain))
9341                 return 0;
9342
9343         data_size = 0;
9344         list_for_each_entry(rule, &chain->rules, list) {
9345                 if (nft_is_active_next(net, rule)) {
9346                         data_size += sizeof(*prule) + rule->dlen;
9347                         if (data_size > INT_MAX)
9348                                 return -ENOMEM;
9349                 }
9350         }
9351
9352         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9353         if (!chain->blob_next)
9354                 return -ENOMEM;
9355
9356         data = (void *)chain->blob_next->data;
9357         data_boundary = data + data_size;
9358         size = 0;
9359
9360         list_for_each_entry(rule, &chain->rules, list) {
9361                 if (!nft_is_active_next(net, rule))
9362                         continue;
9363
9364                 prule = (struct nft_rule_dp *)data;
9365                 data += offsetof(struct nft_rule_dp, data);
9366                 if (WARN_ON_ONCE(data > data_boundary))
9367                         return -ENOMEM;
9368
9369                 size = 0;
9370                 track.last = nft_expr_last(rule);
9371                 nft_rule_for_each_expr(expr, last, rule) {
9372                         track.cur = expr;
9373
9374                         if (nft_expr_reduce(&track, expr)) {
9375                                 expr = track.cur;
9376                                 continue;
9377                         }
9378
9379                         if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9380                                 return -ENOMEM;
9381
9382                         memcpy(data + size, expr, expr->ops->size);
9383                         size += expr->ops->size;
9384                 }
9385                 if (WARN_ON_ONCE(size >= 1 << 12))
9386                         return -ENOMEM;
9387
9388                 prule->handle = rule->handle;
9389                 prule->dlen = size;
9390                 prule->is_last = 0;
9391
9392                 data += size;
9393                 size = 0;
9394                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9395         }
9396
9397         if (WARN_ON_ONCE(data > data_boundary))
9398                 return -ENOMEM;
9399
9400         prule = (struct nft_rule_dp *)data;
9401         nft_last_rule(chain, prule);
9402
9403         return 0;
9404 }
9405
9406 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9407 {
9408         struct nftables_pernet *nft_net = nft_pernet(net);
9409         struct nft_trans *trans, *next;
9410
9411         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9412                 struct nft_chain *chain = trans->ctx.chain;
9413
9414                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9415                     trans->msg_type == NFT_MSG_DELRULE) {
9416                         kvfree(chain->blob_next);
9417                         chain->blob_next = NULL;
9418                 }
9419         }
9420 }
9421
9422 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9423 {
9424         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9425
9426         kvfree(l->blob);
9427 }
9428
9429 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9430 {
9431         struct nft_rule_dp_last *last;
9432
9433         /* last rule trailer is after end marker */
9434         last = (void *)blob + sizeof(*blob) + blob->size;
9435         last->blob = blob;
9436
9437         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9438 }
9439
9440 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9441 {
9442         struct nft_rule_blob *g0, *g1;
9443         bool next_genbit;
9444
9445         next_genbit = nft_gencursor_next(net);
9446
9447         g0 = rcu_dereference_protected(chain->blob_gen_0,
9448                                        lockdep_commit_lock_is_held(net));
9449         g1 = rcu_dereference_protected(chain->blob_gen_1,
9450                                        lockdep_commit_lock_is_held(net));
9451
9452         /* No changes to this chain? */
9453         if (chain->blob_next == NULL) {
9454                 /* chain had no change in last or next generation */
9455                 if (g0 == g1)
9456                         return;
9457                 /*
9458                  * chain had no change in this generation; make sure next
9459                  * one uses same rules as current generation.
9460                  */
9461                 if (next_genbit) {
9462                         rcu_assign_pointer(chain->blob_gen_1, g0);
9463                         nf_tables_commit_chain_free_rules_old(g1);
9464                 } else {
9465                         rcu_assign_pointer(chain->blob_gen_0, g1);
9466                         nf_tables_commit_chain_free_rules_old(g0);
9467                 }
9468
9469                 return;
9470         }
9471
9472         if (next_genbit)
9473                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9474         else
9475                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9476
9477         chain->blob_next = NULL;
9478
9479         if (g0 == g1)
9480                 return;
9481
9482         if (next_genbit)
9483                 nf_tables_commit_chain_free_rules_old(g1);
9484         else
9485                 nf_tables_commit_chain_free_rules_old(g0);
9486 }
9487
9488 static void nft_obj_del(struct nft_object *obj)
9489 {
9490         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9491         list_del_rcu(&obj->list);
9492 }
9493
9494 void nft_chain_del(struct nft_chain *chain)
9495 {
9496         struct nft_table *table = chain->table;
9497
9498         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9499                                      nft_chain_ht_params));
9500         list_del_rcu(&chain->list);
9501 }
9502
9503 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9504                                         struct nft_trans_gc *trans)
9505 {
9506         struct nft_elem_priv **priv = trans->priv;
9507         unsigned int i;
9508
9509         for (i = 0; i < trans->count; i++) {
9510                 nft_setelem_data_deactivate(ctx->net, trans->set, priv[i]);
9511                 nft_setelem_remove(ctx->net, trans->set, priv[i]);
9512         }
9513 }
9514
9515 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9516 {
9517         nft_set_put(trans->set);
9518         put_net(trans->net);
9519         kfree(trans);
9520 }
9521
9522 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9523 {
9524         struct nft_elem_priv *elem_priv;
9525         struct nft_trans_gc *trans;
9526         struct nft_ctx ctx = {};
9527         unsigned int i;
9528
9529         trans = container_of(rcu, struct nft_trans_gc, rcu);
9530         ctx.net = read_pnet(&trans->set->net);
9531
9532         for (i = 0; i < trans->count; i++) {
9533                 elem_priv = trans->priv[i];
9534                 if (!nft_setelem_is_catchall(trans->set, elem_priv))
9535                         atomic_dec(&trans->set->nelems);
9536
9537                 nf_tables_set_elem_destroy(&ctx, trans->set, elem_priv);
9538         }
9539
9540         nft_trans_gc_destroy(trans);
9541 }
9542
9543 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9544 {
9545         struct nftables_pernet *nft_net;
9546         struct nft_ctx ctx = {};
9547
9548         nft_net = nft_pernet(trans->net);
9549
9550         mutex_lock(&nft_net->commit_mutex);
9551
9552         /* Check for race with transaction, otherwise this batch refers to
9553          * stale objects that might not be there anymore. Skip transaction if
9554          * set has been destroyed from control plane transaction in case gc
9555          * worker loses race.
9556          */
9557         if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9558                 mutex_unlock(&nft_net->commit_mutex);
9559                 return false;
9560         }
9561
9562         ctx.net = trans->net;
9563         ctx.table = trans->set->table;
9564
9565         nft_trans_gc_setelem_remove(&ctx, trans);
9566         mutex_unlock(&nft_net->commit_mutex);
9567
9568         return true;
9569 }
9570
9571 static void nft_trans_gc_work(struct work_struct *work)
9572 {
9573         struct nft_trans_gc *trans, *next;
9574         LIST_HEAD(trans_gc_list);
9575
9576         spin_lock(&nf_tables_gc_list_lock);
9577         list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9578         spin_unlock(&nf_tables_gc_list_lock);
9579
9580         list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9581                 list_del(&trans->list);
9582                 if (!nft_trans_gc_work_done(trans)) {
9583                         nft_trans_gc_destroy(trans);
9584                         continue;
9585                 }
9586                 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9587         }
9588 }
9589
9590 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9591                                         unsigned int gc_seq, gfp_t gfp)
9592 {
9593         struct net *net = read_pnet(&set->net);
9594         struct nft_trans_gc *trans;
9595
9596         trans = kzalloc(sizeof(*trans), gfp);
9597         if (!trans)
9598                 return NULL;
9599
9600         trans->net = maybe_get_net(net);
9601         if (!trans->net) {
9602                 kfree(trans);
9603                 return NULL;
9604         }
9605
9606         refcount_inc(&set->refs);
9607         trans->set = set;
9608         trans->seq = gc_seq;
9609
9610         return trans;
9611 }
9612
9613 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9614 {
9615         trans->priv[trans->count++] = priv;
9616 }
9617
9618 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9619 {
9620         spin_lock(&nf_tables_gc_list_lock);
9621         list_add_tail(&trans->list, &nf_tables_gc_list);
9622         spin_unlock(&nf_tables_gc_list_lock);
9623
9624         schedule_work(&trans_gc_work);
9625 }
9626
9627 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9628 {
9629         return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9630 }
9631
9632 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9633                                               unsigned int gc_seq, gfp_t gfp)
9634 {
9635         struct nft_set *set;
9636
9637         if (nft_trans_gc_space(gc))
9638                 return gc;
9639
9640         set = gc->set;
9641         nft_trans_gc_queue_work(gc);
9642
9643         return nft_trans_gc_alloc(set, gc_seq, gfp);
9644 }
9645
9646 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9647 {
9648         if (trans->count == 0) {
9649                 nft_trans_gc_destroy(trans);
9650                 return;
9651         }
9652
9653         nft_trans_gc_queue_work(trans);
9654 }
9655
9656 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9657 {
9658         struct nft_set *set;
9659
9660         if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9661                 return NULL;
9662
9663         if (nft_trans_gc_space(gc))
9664                 return gc;
9665
9666         set = gc->set;
9667         call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9668
9669         return nft_trans_gc_alloc(set, 0, gfp);
9670 }
9671
9672 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9673 {
9674         WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9675
9676         if (trans->count == 0) {
9677                 nft_trans_gc_destroy(trans);
9678                 return;
9679         }
9680
9681         call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9682 }
9683
9684 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9685                                                  unsigned int gc_seq)
9686 {
9687         struct nft_set_elem_catchall *catchall;
9688         const struct nft_set *set = gc->set;
9689         struct nft_set_ext *ext;
9690
9691         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9692                 ext = nft_set_elem_ext(set, catchall->elem);
9693
9694                 if (!nft_set_elem_expired(ext))
9695                         continue;
9696                 if (nft_set_elem_is_dead(ext))
9697                         goto dead_elem;
9698
9699                 nft_set_elem_dead(ext);
9700 dead_elem:
9701                 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9702                 if (!gc)
9703                         return NULL;
9704
9705                 nft_trans_gc_elem_add(gc, catchall->elem);
9706         }
9707
9708         return gc;
9709 }
9710
9711 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9712 {
9713         struct nft_set_elem_catchall *catchall, *next;
9714         const struct nft_set *set = gc->set;
9715         struct nft_elem_priv *elem_priv;
9716         struct nft_set_ext *ext;
9717
9718         WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9719
9720         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9721                 ext = nft_set_elem_ext(set, catchall->elem);
9722
9723                 if (!nft_set_elem_expired(ext))
9724                         continue;
9725
9726                 gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9727                 if (!gc)
9728                         return NULL;
9729
9730                 elem_priv = catchall->elem;
9731                 nft_setelem_data_deactivate(gc->net, gc->set, elem_priv);
9732                 nft_setelem_catchall_destroy(catchall);
9733                 nft_trans_gc_elem_add(gc, elem_priv);
9734         }
9735
9736         return gc;
9737 }
9738
9739 static void nf_tables_module_autoload_cleanup(struct net *net)
9740 {
9741         struct nftables_pernet *nft_net = nft_pernet(net);
9742         struct nft_module_request *req, *next;
9743
9744         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9745         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9746                 WARN_ON_ONCE(!req->done);
9747                 list_del(&req->list);
9748                 kfree(req);
9749         }
9750 }
9751
9752 static void nf_tables_commit_release(struct net *net)
9753 {
9754         struct nftables_pernet *nft_net = nft_pernet(net);
9755         struct nft_trans *trans;
9756
9757         /* all side effects have to be made visible.
9758          * For example, if a chain named 'foo' has been deleted, a
9759          * new transaction must not find it anymore.
9760          *
9761          * Memory reclaim happens asynchronously from work queue
9762          * to prevent expensive synchronize_rcu() in commit phase.
9763          */
9764         if (list_empty(&nft_net->commit_list)) {
9765                 nf_tables_module_autoload_cleanup(net);
9766                 mutex_unlock(&nft_net->commit_mutex);
9767                 return;
9768         }
9769
9770         trans = list_last_entry(&nft_net->commit_list,
9771                                 struct nft_trans, list);
9772         get_net(trans->ctx.net);
9773         WARN_ON_ONCE(trans->put_net);
9774
9775         trans->put_net = true;
9776         spin_lock(&nf_tables_destroy_list_lock);
9777         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9778         spin_unlock(&nf_tables_destroy_list_lock);
9779
9780         nf_tables_module_autoload_cleanup(net);
9781         schedule_work(&trans_destroy_work);
9782
9783         mutex_unlock(&nft_net->commit_mutex);
9784 }
9785
9786 static void nft_commit_notify(struct net *net, u32 portid)
9787 {
9788         struct nftables_pernet *nft_net = nft_pernet(net);
9789         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9790         unsigned char *data;
9791         int len;
9792
9793         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9794                 if (!batch_skb) {
9795 new_batch:
9796                         batch_skb = skb;
9797                         len = NLMSG_GOODSIZE - skb->len;
9798                         list_del(&skb->list);
9799                         continue;
9800                 }
9801                 len -= skb->len;
9802                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9803                         data = skb_put(batch_skb, skb->len);
9804                         memcpy(data, skb->data, skb->len);
9805                         list_del(&skb->list);
9806                         kfree_skb(skb);
9807                         continue;
9808                 }
9809                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9810                                NFT_CB(batch_skb).report, GFP_KERNEL);
9811                 goto new_batch;
9812         }
9813
9814         if (batch_skb) {
9815                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9816                                NFT_CB(batch_skb).report, GFP_KERNEL);
9817         }
9818
9819         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9820 }
9821
9822 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9823                                         struct nft_table *table)
9824 {
9825         struct nft_audit_data *adp;
9826
9827         list_for_each_entry(adp, adl, list) {
9828                 if (adp->table == table)
9829                         return 0;
9830         }
9831         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9832         if (!adp)
9833                 return -ENOMEM;
9834         adp->table = table;
9835         list_add(&adp->list, adl);
9836         return 0;
9837 }
9838
9839 static void nf_tables_commit_audit_free(struct list_head *adl)
9840 {
9841         struct nft_audit_data *adp, *adn;
9842
9843         list_for_each_entry_safe(adp, adn, adl, list) {
9844                 list_del(&adp->list);
9845                 kfree(adp);
9846         }
9847 }
9848
9849 static void nf_tables_commit_audit_collect(struct list_head *adl,
9850                                            struct nft_table *table, u32 op)
9851 {
9852         struct nft_audit_data *adp;
9853
9854         list_for_each_entry(adp, adl, list) {
9855                 if (adp->table == table)
9856                         goto found;
9857         }
9858         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9859         return;
9860 found:
9861         adp->entries++;
9862         if (!adp->op || adp->op > op)
9863                 adp->op = op;
9864 }
9865
9866 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9867
9868 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9869 {
9870         struct nft_audit_data *adp, *adn;
9871         char aubuf[AUNFTABLENAMELEN];
9872
9873         list_for_each_entry_safe(adp, adn, adl, list) {
9874                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9875                          generation);
9876                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9877                                 nft2audit_op[adp->op], GFP_KERNEL);
9878                 list_del(&adp->list);
9879                 kfree(adp);
9880         }
9881 }
9882
9883 static void nft_set_commit_update(struct list_head *set_update_list)
9884 {
9885         struct nft_set *set, *next;
9886
9887         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9888                 list_del_init(&set->pending_update);
9889
9890                 if (!set->ops->commit)
9891                         continue;
9892
9893                 set->ops->commit(set);
9894         }
9895 }
9896
9897 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
9898 {
9899         unsigned int gc_seq;
9900
9901         /* Bump gc counter, it becomes odd, this is the busy mark. */
9902         gc_seq = READ_ONCE(nft_net->gc_seq);
9903         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9904
9905         return gc_seq;
9906 }
9907
9908 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
9909 {
9910         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9911 }
9912
9913 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9914 {
9915         struct nftables_pernet *nft_net = nft_pernet(net);
9916         struct nft_trans *trans, *next;
9917         unsigned int base_seq, gc_seq;
9918         LIST_HEAD(set_update_list);
9919         struct nft_trans_elem *te;
9920         struct nft_chain *chain;
9921         struct nft_table *table;
9922         LIST_HEAD(adl);
9923         int err;
9924
9925         if (list_empty(&nft_net->commit_list)) {
9926                 mutex_unlock(&nft_net->commit_mutex);
9927                 return 0;
9928         }
9929
9930         list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9931                 switch (trans->msg_type) {
9932                 case NFT_MSG_NEWSET:
9933                         if (!nft_trans_set_update(trans) &&
9934                             nft_set_is_anonymous(nft_trans_set(trans)) &&
9935                             !nft_trans_set_bound(trans)) {
9936                                 pr_warn_once("nftables ruleset with unbound set\n");
9937                                 return -EINVAL;
9938                         }
9939                         break;
9940                 case NFT_MSG_NEWCHAIN:
9941                         if (!nft_trans_chain_update(trans) &&
9942                             nft_chain_binding(nft_trans_chain(trans)) &&
9943                             !nft_trans_chain_bound(trans)) {
9944                                 pr_warn_once("nftables ruleset with unbound chain\n");
9945                                 return -EINVAL;
9946                         }
9947                         break;
9948                 }
9949         }
9950
9951         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9952         if (nf_tables_validate(net) < 0) {
9953                 nft_net->validate_state = NFT_VALIDATE_DO;
9954                 return -EAGAIN;
9955         }
9956
9957         err = nft_flow_rule_offload_commit(net);
9958         if (err < 0)
9959                 return err;
9960
9961         /* 1.  Allocate space for next generation rules_gen_X[] */
9962         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9963                 int ret;
9964
9965                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9966                 if (ret) {
9967                         nf_tables_commit_chain_prepare_cancel(net);
9968                         nf_tables_commit_audit_free(&adl);
9969                         return ret;
9970                 }
9971                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9972                     trans->msg_type == NFT_MSG_DELRULE) {
9973                         chain = trans->ctx.chain;
9974
9975                         ret = nf_tables_commit_chain_prepare(net, chain);
9976                         if (ret < 0) {
9977                                 nf_tables_commit_chain_prepare_cancel(net);
9978                                 nf_tables_commit_audit_free(&adl);
9979                                 return ret;
9980                         }
9981                 }
9982         }
9983
9984         /* step 2.  Make rules_gen_X visible to packet path */
9985         list_for_each_entry(table, &nft_net->tables, list) {
9986                 list_for_each_entry(chain, &table->chains, list)
9987                         nf_tables_commit_chain(net, chain);
9988         }
9989
9990         /*
9991          * Bump generation counter, invalidate any dump in progress.
9992          * Cannot fail after this point.
9993          */
9994         base_seq = READ_ONCE(nft_net->base_seq);
9995         while (++base_seq == 0)
9996                 ;
9997
9998         WRITE_ONCE(nft_net->base_seq, base_seq);
9999
10000         gc_seq = nft_gc_seq_begin(nft_net);
10001
10002         /* step 3. Start new generation, rules_gen_X now in use. */
10003         net->nft.gencursor = nft_gencursor_next(net);
10004
10005         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10006                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
10007                                                trans->msg_type);
10008                 switch (trans->msg_type) {
10009                 case NFT_MSG_NEWTABLE:
10010                         if (nft_trans_table_update(trans)) {
10011                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10012                                         nft_trans_destroy(trans);
10013                                         break;
10014                                 }
10015                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
10016                                         nf_tables_table_disable(net, trans->ctx.table);
10017
10018                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10019                         } else {
10020                                 nft_clear(net, trans->ctx.table);
10021                         }
10022                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10023                         nft_trans_destroy(trans);
10024                         break;
10025                 case NFT_MSG_DELTABLE:
10026                 case NFT_MSG_DESTROYTABLE:
10027                         list_del_rcu(&trans->ctx.table->list);
10028                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
10029                         break;
10030                 case NFT_MSG_NEWCHAIN:
10031                         if (nft_trans_chain_update(trans)) {
10032                                 nft_chain_commit_update(trans);
10033                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10034                                                        &nft_trans_chain_hooks(trans));
10035                                 list_splice(&nft_trans_chain_hooks(trans),
10036                                             &nft_trans_basechain(trans)->hook_list);
10037                                 /* trans destroyed after rcu grace period */
10038                         } else {
10039                                 nft_chain_commit_drop_policy(trans);
10040                                 nft_clear(net, trans->ctx.chain);
10041                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10042                                 nft_trans_destroy(trans);
10043                         }
10044                         break;
10045                 case NFT_MSG_DELCHAIN:
10046                 case NFT_MSG_DESTROYCHAIN:
10047                         if (nft_trans_chain_update(trans)) {
10048                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10049                                                        &nft_trans_chain_hooks(trans));
10050                                 nft_netdev_unregister_hooks(net,
10051                                                             &nft_trans_chain_hooks(trans),
10052                                                             true);
10053                         } else {
10054                                 nft_chain_del(trans->ctx.chain);
10055                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10056                                                        NULL);
10057                                 nf_tables_unregister_hook(trans->ctx.net,
10058                                                           trans->ctx.table,
10059                                                           trans->ctx.chain);
10060                         }
10061                         break;
10062                 case NFT_MSG_NEWRULE:
10063                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10064                         nf_tables_rule_notify(&trans->ctx,
10065                                               nft_trans_rule(trans),
10066                                               NFT_MSG_NEWRULE);
10067                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10068                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10069
10070                         nft_trans_destroy(trans);
10071                         break;
10072                 case NFT_MSG_DELRULE:
10073                 case NFT_MSG_DESTROYRULE:
10074                         list_del_rcu(&nft_trans_rule(trans)->list);
10075                         nf_tables_rule_notify(&trans->ctx,
10076                                               nft_trans_rule(trans),
10077                                               trans->msg_type);
10078                         nft_rule_expr_deactivate(&trans->ctx,
10079                                                  nft_trans_rule(trans),
10080                                                  NFT_TRANS_COMMIT);
10081
10082                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10083                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10084                         break;
10085                 case NFT_MSG_NEWSET:
10086                         if (nft_trans_set_update(trans)) {
10087                                 struct nft_set *set = nft_trans_set(trans);
10088
10089                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10090                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10091
10092                                 if (nft_trans_set_size(trans))
10093                                         WRITE_ONCE(set->size, nft_trans_set_size(trans));
10094                         } else {
10095                                 nft_clear(net, nft_trans_set(trans));
10096                                 /* This avoids hitting -EBUSY when deleting the table
10097                                  * from the transaction.
10098                                  */
10099                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10100                                     !list_empty(&nft_trans_set(trans)->bindings))
10101                                         nft_use_dec(&trans->ctx.table->use);
10102                         }
10103                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10104                                              NFT_MSG_NEWSET, GFP_KERNEL);
10105                         nft_trans_destroy(trans);
10106                         break;
10107                 case NFT_MSG_DELSET:
10108                 case NFT_MSG_DESTROYSET:
10109                         nft_trans_set(trans)->dead = 1;
10110                         list_del_rcu(&nft_trans_set(trans)->list);
10111                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10112                                              trans->msg_type, GFP_KERNEL);
10113                         break;
10114                 case NFT_MSG_NEWSETELEM:
10115                         te = (struct nft_trans_elem *)trans->data;
10116
10117                         nft_setelem_activate(net, te->set, te->elem_priv);
10118                         nf_tables_setelem_notify(&trans->ctx, te->set,
10119                                                  te->elem_priv,
10120                                                  NFT_MSG_NEWSETELEM);
10121                         if (te->set->ops->commit &&
10122                             list_empty(&te->set->pending_update)) {
10123                                 list_add_tail(&te->set->pending_update,
10124                                               &set_update_list);
10125                         }
10126                         nft_trans_destroy(trans);
10127                         break;
10128                 case NFT_MSG_DELSETELEM:
10129                 case NFT_MSG_DESTROYSETELEM:
10130                         te = (struct nft_trans_elem *)trans->data;
10131
10132                         nf_tables_setelem_notify(&trans->ctx, te->set,
10133                                                  te->elem_priv,
10134                                                  trans->msg_type);
10135                         nft_setelem_remove(net, te->set, te->elem_priv);
10136                         if (!nft_setelem_is_catchall(te->set, te->elem_priv)) {
10137                                 atomic_dec(&te->set->nelems);
10138                                 te->set->ndeact--;
10139                         }
10140                         if (te->set->ops->commit &&
10141                             list_empty(&te->set->pending_update)) {
10142                                 list_add_tail(&te->set->pending_update,
10143                                               &set_update_list);
10144                         }
10145                         break;
10146                 case NFT_MSG_NEWOBJ:
10147                         if (nft_trans_obj_update(trans)) {
10148                                 nft_obj_commit_update(trans);
10149                                 nf_tables_obj_notify(&trans->ctx,
10150                                                      nft_trans_obj(trans),
10151                                                      NFT_MSG_NEWOBJ);
10152                         } else {
10153                                 nft_clear(net, nft_trans_obj(trans));
10154                                 nf_tables_obj_notify(&trans->ctx,
10155                                                      nft_trans_obj(trans),
10156                                                      NFT_MSG_NEWOBJ);
10157                                 nft_trans_destroy(trans);
10158                         }
10159                         break;
10160                 case NFT_MSG_DELOBJ:
10161                 case NFT_MSG_DESTROYOBJ:
10162                         nft_obj_del(nft_trans_obj(trans));
10163                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10164                                              trans->msg_type);
10165                         break;
10166                 case NFT_MSG_NEWFLOWTABLE:
10167                         if (nft_trans_flowtable_update(trans)) {
10168                                 nft_trans_flowtable(trans)->data.flags =
10169                                         nft_trans_flowtable_flags(trans);
10170                                 nf_tables_flowtable_notify(&trans->ctx,
10171                                                            nft_trans_flowtable(trans),
10172                                                            &nft_trans_flowtable_hooks(trans),
10173                                                            NFT_MSG_NEWFLOWTABLE);
10174                                 list_splice(&nft_trans_flowtable_hooks(trans),
10175                                             &nft_trans_flowtable(trans)->hook_list);
10176                         } else {
10177                                 nft_clear(net, nft_trans_flowtable(trans));
10178                                 nf_tables_flowtable_notify(&trans->ctx,
10179                                                            nft_trans_flowtable(trans),
10180                                                            NULL,
10181                                                            NFT_MSG_NEWFLOWTABLE);
10182                         }
10183                         nft_trans_destroy(trans);
10184                         break;
10185                 case NFT_MSG_DELFLOWTABLE:
10186                 case NFT_MSG_DESTROYFLOWTABLE:
10187                         if (nft_trans_flowtable_update(trans)) {
10188                                 nf_tables_flowtable_notify(&trans->ctx,
10189                                                            nft_trans_flowtable(trans),
10190                                                            &nft_trans_flowtable_hooks(trans),
10191                                                            trans->msg_type);
10192                                 nft_unregister_flowtable_net_hooks(net,
10193                                                                    &nft_trans_flowtable_hooks(trans));
10194                         } else {
10195                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10196                                 nf_tables_flowtable_notify(&trans->ctx,
10197                                                            nft_trans_flowtable(trans),
10198                                                            NULL,
10199                                                            trans->msg_type);
10200                                 nft_unregister_flowtable_net_hooks(net,
10201                                                 &nft_trans_flowtable(trans)->hook_list);
10202                         }
10203                         break;
10204                 }
10205         }
10206
10207         nft_set_commit_update(&set_update_list);
10208
10209         nft_commit_notify(net, NETLINK_CB(skb).portid);
10210         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10211         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10212
10213         nft_gc_seq_end(nft_net, gc_seq);
10214         nft_net->validate_state = NFT_VALIDATE_SKIP;
10215         nf_tables_commit_release(net);
10216
10217         return 0;
10218 }
10219
10220 static void nf_tables_module_autoload(struct net *net)
10221 {
10222         struct nftables_pernet *nft_net = nft_pernet(net);
10223         struct nft_module_request *req, *next;
10224         LIST_HEAD(module_list);
10225
10226         list_splice_init(&nft_net->module_list, &module_list);
10227         mutex_unlock(&nft_net->commit_mutex);
10228         list_for_each_entry_safe(req, next, &module_list, list) {
10229                 request_module("%s", req->module);
10230                 req->done = true;
10231         }
10232         mutex_lock(&nft_net->commit_mutex);
10233         list_splice(&module_list, &nft_net->module_list);
10234 }
10235
10236 static void nf_tables_abort_release(struct nft_trans *trans)
10237 {
10238         switch (trans->msg_type) {
10239         case NFT_MSG_NEWTABLE:
10240                 nf_tables_table_destroy(&trans->ctx);
10241                 break;
10242         case NFT_MSG_NEWCHAIN:
10243                 if (nft_trans_chain_update(trans))
10244                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10245                 else
10246                         nf_tables_chain_destroy(&trans->ctx);
10247                 break;
10248         case NFT_MSG_NEWRULE:
10249                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10250                 break;
10251         case NFT_MSG_NEWSET:
10252                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10253                 break;
10254         case NFT_MSG_NEWSETELEM:
10255                 nft_set_elem_destroy(nft_trans_elem_set(trans),
10256                                      nft_trans_elem_priv(trans), true);
10257                 break;
10258         case NFT_MSG_NEWOBJ:
10259                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10260                 break;
10261         case NFT_MSG_NEWFLOWTABLE:
10262                 if (nft_trans_flowtable_update(trans))
10263                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10264                 else
10265                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10266                 break;
10267         }
10268         kfree(trans);
10269 }
10270
10271 static void nft_set_abort_update(struct list_head *set_update_list)
10272 {
10273         struct nft_set *set, *next;
10274
10275         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10276                 list_del_init(&set->pending_update);
10277
10278                 if (!set->ops->abort)
10279                         continue;
10280
10281                 set->ops->abort(set);
10282         }
10283 }
10284
10285 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10286 {
10287         struct nftables_pernet *nft_net = nft_pernet(net);
10288         struct nft_trans *trans, *next;
10289         LIST_HEAD(set_update_list);
10290         struct nft_trans_elem *te;
10291
10292         if (action == NFNL_ABORT_VALIDATE &&
10293             nf_tables_validate(net) < 0)
10294                 return -EAGAIN;
10295
10296         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10297                                          list) {
10298                 switch (trans->msg_type) {
10299                 case NFT_MSG_NEWTABLE:
10300                         if (nft_trans_table_update(trans)) {
10301                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10302                                         nft_trans_destroy(trans);
10303                                         break;
10304                                 }
10305                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10306                                         nf_tables_table_disable(net, trans->ctx.table);
10307                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10308                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10309                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10310                                 }
10311                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10312                                 nft_trans_destroy(trans);
10313                         } else {
10314                                 list_del_rcu(&trans->ctx.table->list);
10315                         }
10316                         break;
10317                 case NFT_MSG_DELTABLE:
10318                 case NFT_MSG_DESTROYTABLE:
10319                         nft_clear(trans->ctx.net, trans->ctx.table);
10320                         nft_trans_destroy(trans);
10321                         break;
10322                 case NFT_MSG_NEWCHAIN:
10323                         if (nft_trans_chain_update(trans)) {
10324                                 nft_netdev_unregister_hooks(net,
10325                                                             &nft_trans_chain_hooks(trans),
10326                                                             true);
10327                                 free_percpu(nft_trans_chain_stats(trans));
10328                                 kfree(nft_trans_chain_name(trans));
10329                                 nft_trans_destroy(trans);
10330                         } else {
10331                                 if (nft_trans_chain_bound(trans)) {
10332                                         nft_trans_destroy(trans);
10333                                         break;
10334                                 }
10335                                 nft_use_dec_restore(&trans->ctx.table->use);
10336                                 nft_chain_del(trans->ctx.chain);
10337                                 nf_tables_unregister_hook(trans->ctx.net,
10338                                                           trans->ctx.table,
10339                                                           trans->ctx.chain);
10340                         }
10341                         break;
10342                 case NFT_MSG_DELCHAIN:
10343                 case NFT_MSG_DESTROYCHAIN:
10344                         if (nft_trans_chain_update(trans)) {
10345                                 list_splice(&nft_trans_chain_hooks(trans),
10346                                             &nft_trans_basechain(trans)->hook_list);
10347                         } else {
10348                                 nft_use_inc_restore(&trans->ctx.table->use);
10349                                 nft_clear(trans->ctx.net, trans->ctx.chain);
10350                         }
10351                         nft_trans_destroy(trans);
10352                         break;
10353                 case NFT_MSG_NEWRULE:
10354                         if (nft_trans_rule_bound(trans)) {
10355                                 nft_trans_destroy(trans);
10356                                 break;
10357                         }
10358                         nft_use_dec_restore(&trans->ctx.chain->use);
10359                         list_del_rcu(&nft_trans_rule(trans)->list);
10360                         nft_rule_expr_deactivate(&trans->ctx,
10361                                                  nft_trans_rule(trans),
10362                                                  NFT_TRANS_ABORT);
10363                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10364                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10365                         break;
10366                 case NFT_MSG_DELRULE:
10367                 case NFT_MSG_DESTROYRULE:
10368                         nft_use_inc_restore(&trans->ctx.chain->use);
10369                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10370                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10371                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10372                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10373
10374                         nft_trans_destroy(trans);
10375                         break;
10376                 case NFT_MSG_NEWSET:
10377                         if (nft_trans_set_update(trans)) {
10378                                 nft_trans_destroy(trans);
10379                                 break;
10380                         }
10381                         nft_use_dec_restore(&trans->ctx.table->use);
10382                         if (nft_trans_set_bound(trans)) {
10383                                 nft_trans_destroy(trans);
10384                                 break;
10385                         }
10386                         list_del_rcu(&nft_trans_set(trans)->list);
10387                         break;
10388                 case NFT_MSG_DELSET:
10389                 case NFT_MSG_DESTROYSET:
10390                         nft_use_inc_restore(&trans->ctx.table->use);
10391                         nft_clear(trans->ctx.net, nft_trans_set(trans));
10392                         if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10393                                 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10394
10395                         nft_trans_destroy(trans);
10396                         break;
10397                 case NFT_MSG_NEWSETELEM:
10398                         if (nft_trans_elem_set_bound(trans)) {
10399                                 nft_trans_destroy(trans);
10400                                 break;
10401                         }
10402                         te = (struct nft_trans_elem *)trans->data;
10403                         nft_setelem_remove(net, te->set, te->elem_priv);
10404                         if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10405                                 atomic_dec(&te->set->nelems);
10406
10407                         if (te->set->ops->abort &&
10408                             list_empty(&te->set->pending_update)) {
10409                                 list_add_tail(&te->set->pending_update,
10410                                               &set_update_list);
10411                         }
10412                         break;
10413                 case NFT_MSG_DELSETELEM:
10414                 case NFT_MSG_DESTROYSETELEM:
10415                         te = (struct nft_trans_elem *)trans->data;
10416
10417                         nft_setelem_data_activate(net, te->set, te->elem_priv);
10418                         nft_setelem_activate(net, te->set, te->elem_priv);
10419                         if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10420                                 te->set->ndeact--;
10421
10422                         if (te->set->ops->abort &&
10423                             list_empty(&te->set->pending_update)) {
10424                                 list_add_tail(&te->set->pending_update,
10425                                               &set_update_list);
10426                         }
10427                         nft_trans_destroy(trans);
10428                         break;
10429                 case NFT_MSG_NEWOBJ:
10430                         if (nft_trans_obj_update(trans)) {
10431                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10432                                 nft_trans_destroy(trans);
10433                         } else {
10434                                 nft_use_dec_restore(&trans->ctx.table->use);
10435                                 nft_obj_del(nft_trans_obj(trans));
10436                         }
10437                         break;
10438                 case NFT_MSG_DELOBJ:
10439                 case NFT_MSG_DESTROYOBJ:
10440                         nft_use_inc_restore(&trans->ctx.table->use);
10441                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
10442                         nft_trans_destroy(trans);
10443                         break;
10444                 case NFT_MSG_NEWFLOWTABLE:
10445                         if (nft_trans_flowtable_update(trans)) {
10446                                 nft_unregister_flowtable_net_hooks(net,
10447                                                 &nft_trans_flowtable_hooks(trans));
10448                         } else {
10449                                 nft_use_dec_restore(&trans->ctx.table->use);
10450                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10451                                 nft_unregister_flowtable_net_hooks(net,
10452                                                 &nft_trans_flowtable(trans)->hook_list);
10453                         }
10454                         break;
10455                 case NFT_MSG_DELFLOWTABLE:
10456                 case NFT_MSG_DESTROYFLOWTABLE:
10457                         if (nft_trans_flowtable_update(trans)) {
10458                                 list_splice(&nft_trans_flowtable_hooks(trans),
10459                                             &nft_trans_flowtable(trans)->hook_list);
10460                         } else {
10461                                 nft_use_inc_restore(&trans->ctx.table->use);
10462                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10463                         }
10464                         nft_trans_destroy(trans);
10465                         break;
10466                 }
10467         }
10468
10469         nft_set_abort_update(&set_update_list);
10470
10471         synchronize_rcu();
10472
10473         list_for_each_entry_safe_reverse(trans, next,
10474                                          &nft_net->commit_list, list) {
10475                 nft_trans_list_del(trans);
10476                 nf_tables_abort_release(trans);
10477         }
10478
10479         if (action == NFNL_ABORT_AUTOLOAD)
10480                 nf_tables_module_autoload(net);
10481         else
10482                 nf_tables_module_autoload_cleanup(net);
10483
10484         return 0;
10485 }
10486
10487 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10488                            enum nfnl_abort_action action)
10489 {
10490         struct nftables_pernet *nft_net = nft_pernet(net);
10491         unsigned int gc_seq;
10492         int ret;
10493
10494         gc_seq = nft_gc_seq_begin(nft_net);
10495         ret = __nf_tables_abort(net, action);
10496         nft_gc_seq_end(nft_net, gc_seq);
10497         mutex_unlock(&nft_net->commit_mutex);
10498
10499         return ret;
10500 }
10501
10502 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10503 {
10504         struct nftables_pernet *nft_net = nft_pernet(net);
10505         bool genid_ok;
10506
10507         mutex_lock(&nft_net->commit_mutex);
10508
10509         genid_ok = genid == 0 || nft_net->base_seq == genid;
10510         if (!genid_ok)
10511                 mutex_unlock(&nft_net->commit_mutex);
10512
10513         /* else, commit mutex has to be released by commit or abort function */
10514         return genid_ok;
10515 }
10516
10517 static const struct nfnetlink_subsystem nf_tables_subsys = {
10518         .name           = "nf_tables",
10519         .subsys_id      = NFNL_SUBSYS_NFTABLES,
10520         .cb_count       = NFT_MSG_MAX,
10521         .cb             = nf_tables_cb,
10522         .commit         = nf_tables_commit,
10523         .abort          = nf_tables_abort,
10524         .valid_genid    = nf_tables_valid_genid,
10525         .owner          = THIS_MODULE,
10526 };
10527
10528 int nft_chain_validate_dependency(const struct nft_chain *chain,
10529                                   enum nft_chain_types type)
10530 {
10531         const struct nft_base_chain *basechain;
10532
10533         if (nft_is_base_chain(chain)) {
10534                 basechain = nft_base_chain(chain);
10535                 if (basechain->type->type != type)
10536                         return -EOPNOTSUPP;
10537         }
10538         return 0;
10539 }
10540 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10541
10542 int nft_chain_validate_hooks(const struct nft_chain *chain,
10543                              unsigned int hook_flags)
10544 {
10545         struct nft_base_chain *basechain;
10546
10547         if (nft_is_base_chain(chain)) {
10548                 basechain = nft_base_chain(chain);
10549
10550                 if ((1 << basechain->ops.hooknum) & hook_flags)
10551                         return 0;
10552
10553                 return -EOPNOTSUPP;
10554         }
10555
10556         return 0;
10557 }
10558 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10559
10560 /*
10561  * Loop detection - walk through the ruleset beginning at the destination chain
10562  * of a new jump until either the source chain is reached (loop) or all
10563  * reachable chains have been traversed.
10564  *
10565  * The loop check is performed whenever a new jump verdict is added to an
10566  * expression or verdict map or a verdict map is bound to a new chain.
10567  */
10568
10569 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10570                                  const struct nft_chain *chain);
10571
10572 static int nft_check_loops(const struct nft_ctx *ctx,
10573                            const struct nft_set_ext *ext)
10574 {
10575         const struct nft_data *data;
10576         int ret;
10577
10578         data = nft_set_ext_data(ext);
10579         switch (data->verdict.code) {
10580         case NFT_JUMP:
10581         case NFT_GOTO:
10582                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10583                 break;
10584         default:
10585                 ret = 0;
10586                 break;
10587         }
10588
10589         return ret;
10590 }
10591
10592 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10593                                         struct nft_set *set,
10594                                         const struct nft_set_iter *iter,
10595                                         struct nft_elem_priv *elem_priv)
10596 {
10597         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
10598
10599         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10600             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10601                 return 0;
10602
10603         return nft_check_loops(ctx, ext);
10604 }
10605
10606 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10607                                   struct nft_set *set)
10608 {
10609         u8 genmask = nft_genmask_next(ctx->net);
10610         struct nft_set_elem_catchall *catchall;
10611         struct nft_set_ext *ext;
10612         int ret = 0;
10613
10614         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10615                 ext = nft_set_elem_ext(set, catchall->elem);
10616                 if (!nft_set_elem_active(ext, genmask))
10617                         continue;
10618
10619                 ret = nft_check_loops(ctx, ext);
10620                 if (ret < 0)
10621                         return ret;
10622         }
10623
10624         return ret;
10625 }
10626
10627 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10628                                  const struct nft_chain *chain)
10629 {
10630         const struct nft_rule *rule;
10631         const struct nft_expr *expr, *last;
10632         struct nft_set *set;
10633         struct nft_set_binding *binding;
10634         struct nft_set_iter iter;
10635
10636         if (ctx->chain == chain)
10637                 return -ELOOP;
10638
10639         if (fatal_signal_pending(current))
10640                 return -EINTR;
10641
10642         list_for_each_entry(rule, &chain->rules, list) {
10643                 nft_rule_for_each_expr(expr, last, rule) {
10644                         struct nft_immediate_expr *priv;
10645                         const struct nft_data *data;
10646                         int err;
10647
10648                         if (strcmp(expr->ops->type->name, "immediate"))
10649                                 continue;
10650
10651                         priv = nft_expr_priv(expr);
10652                         if (priv->dreg != NFT_REG_VERDICT)
10653                                 continue;
10654
10655                         data = &priv->data;
10656                         switch (data->verdict.code) {
10657                         case NFT_JUMP:
10658                         case NFT_GOTO:
10659                                 err = nf_tables_check_loops(ctx,
10660                                                         data->verdict.chain);
10661                                 if (err < 0)
10662                                         return err;
10663                                 break;
10664                         default:
10665                                 break;
10666                         }
10667                 }
10668         }
10669
10670         list_for_each_entry(set, &ctx->table->sets, list) {
10671                 if (!nft_is_active_next(ctx->net, set))
10672                         continue;
10673                 if (!(set->flags & NFT_SET_MAP) ||
10674                     set->dtype != NFT_DATA_VERDICT)
10675                         continue;
10676
10677                 list_for_each_entry(binding, &set->bindings, list) {
10678                         if (!(binding->flags & NFT_SET_MAP) ||
10679                             binding->chain != chain)
10680                                 continue;
10681
10682                         iter.genmask    = nft_genmask_next(ctx->net);
10683                         iter.skip       = 0;
10684                         iter.count      = 0;
10685                         iter.err        = 0;
10686                         iter.fn         = nf_tables_loop_check_setelem;
10687
10688                         set->ops->walk(ctx, set, &iter);
10689                         if (!iter.err)
10690                                 iter.err = nft_set_catchall_loops(ctx, set);
10691
10692                         if (iter.err < 0)
10693                                 return iter.err;
10694                 }
10695         }
10696
10697         return 0;
10698 }
10699
10700 /**
10701  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
10702  *
10703  *      @attr: netlink attribute to fetch value from
10704  *      @max: maximum value to be stored in dest
10705  *      @dest: pointer to the variable
10706  *
10707  *      Parse, check and store a given u32 netlink attribute into variable.
10708  *      This function returns -ERANGE if the value goes over maximum value.
10709  *      Otherwise a 0 is returned and the attribute value is stored in the
10710  *      destination variable.
10711  */
10712 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10713 {
10714         u32 val;
10715
10716         val = ntohl(nla_get_be32(attr));
10717         if (val > max)
10718                 return -ERANGE;
10719
10720         *dest = val;
10721         return 0;
10722 }
10723 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10724
10725 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10726 {
10727         unsigned int reg;
10728
10729         reg = ntohl(nla_get_be32(attr));
10730         switch (reg) {
10731         case NFT_REG_VERDICT...NFT_REG_4:
10732                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10733                 break;
10734         case NFT_REG32_00...NFT_REG32_15:
10735                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10736                 break;
10737         default:
10738                 return -ERANGE;
10739         }
10740
10741         return 0;
10742 }
10743
10744 /**
10745  *      nft_dump_register - dump a register value to a netlink attribute
10746  *
10747  *      @skb: socket buffer
10748  *      @attr: attribute number
10749  *      @reg: register number
10750  *
10751  *      Construct a netlink attribute containing the register number. For
10752  *      compatibility reasons, register numbers being a multiple of 4 are
10753  *      translated to the corresponding 128 bit register numbers.
10754  */
10755 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10756 {
10757         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10758                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10759         else
10760                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10761
10762         return nla_put_be32(skb, attr, htonl(reg));
10763 }
10764 EXPORT_SYMBOL_GPL(nft_dump_register);
10765
10766 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10767 {
10768         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10769                 return -EINVAL;
10770         if (len == 0)
10771                 return -EINVAL;
10772         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10773                 return -ERANGE;
10774
10775         return 0;
10776 }
10777
10778 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10779 {
10780         u32 reg;
10781         int err;
10782
10783         err = nft_parse_register(attr, &reg);
10784         if (err < 0)
10785                 return err;
10786
10787         err = nft_validate_register_load(reg, len);
10788         if (err < 0)
10789                 return err;
10790
10791         *sreg = reg;
10792         return 0;
10793 }
10794 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10795
10796 static int nft_validate_register_store(const struct nft_ctx *ctx,
10797                                        enum nft_registers reg,
10798                                        const struct nft_data *data,
10799                                        enum nft_data_types type,
10800                                        unsigned int len)
10801 {
10802         int err;
10803
10804         switch (reg) {
10805         case NFT_REG_VERDICT:
10806                 if (type != NFT_DATA_VERDICT)
10807                         return -EINVAL;
10808
10809                 if (data != NULL &&
10810                     (data->verdict.code == NFT_GOTO ||
10811                      data->verdict.code == NFT_JUMP)) {
10812                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10813                         if (err < 0)
10814                                 return err;
10815                 }
10816
10817                 return 0;
10818         default:
10819                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10820                         return -EINVAL;
10821                 if (len == 0)
10822                         return -EINVAL;
10823                 if (reg * NFT_REG32_SIZE + len >
10824                     sizeof_field(struct nft_regs, data))
10825                         return -ERANGE;
10826
10827                 if (data != NULL && type != NFT_DATA_VALUE)
10828                         return -EINVAL;
10829                 return 0;
10830         }
10831 }
10832
10833 int nft_parse_register_store(const struct nft_ctx *ctx,
10834                              const struct nlattr *attr, u8 *dreg,
10835                              const struct nft_data *data,
10836                              enum nft_data_types type, unsigned int len)
10837 {
10838         int err;
10839         u32 reg;
10840
10841         err = nft_parse_register(attr, &reg);
10842         if (err < 0)
10843                 return err;
10844
10845         err = nft_validate_register_store(ctx, reg, data, type, len);
10846         if (err < 0)
10847                 return err;
10848
10849         *dreg = reg;
10850         return 0;
10851 }
10852 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10853
10854 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10855         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10856         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10857                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10858         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10859 };
10860
10861 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10862                             struct nft_data_desc *desc, const struct nlattr *nla)
10863 {
10864         u8 genmask = nft_genmask_next(ctx->net);
10865         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10866         struct nft_chain *chain;
10867         int err;
10868
10869         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10870                                           nft_verdict_policy, NULL);
10871         if (err < 0)
10872                 return err;
10873
10874         if (!tb[NFTA_VERDICT_CODE])
10875                 return -EINVAL;
10876
10877         /* zero padding hole for memcmp */
10878         memset(data, 0, sizeof(*data));
10879         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10880
10881         switch (data->verdict.code) {
10882         default:
10883                 switch (data->verdict.code & NF_VERDICT_MASK) {
10884                 case NF_ACCEPT:
10885                 case NF_DROP:
10886                 case NF_QUEUE:
10887                         break;
10888                 default:
10889                         return -EINVAL;
10890                 }
10891                 fallthrough;
10892         case NFT_CONTINUE:
10893         case NFT_BREAK:
10894         case NFT_RETURN:
10895                 break;
10896         case NFT_JUMP:
10897         case NFT_GOTO:
10898                 if (tb[NFTA_VERDICT_CHAIN]) {
10899                         chain = nft_chain_lookup(ctx->net, ctx->table,
10900                                                  tb[NFTA_VERDICT_CHAIN],
10901                                                  genmask);
10902                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10903                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10904                                                       tb[NFTA_VERDICT_CHAIN_ID],
10905                                                       genmask);
10906                         if (IS_ERR(chain))
10907                                 return PTR_ERR(chain);
10908                 } else {
10909                         return -EINVAL;
10910                 }
10911
10912                 if (IS_ERR(chain))
10913                         return PTR_ERR(chain);
10914                 if (nft_is_base_chain(chain))
10915                         return -EOPNOTSUPP;
10916                 if (nft_chain_is_bound(chain))
10917                         return -EINVAL;
10918                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10919                     chain->flags & NFT_CHAIN_BINDING)
10920                         return -EINVAL;
10921                 if (!nft_use_inc(&chain->use))
10922                         return -EMFILE;
10923
10924                 data->verdict.chain = chain;
10925                 break;
10926         }
10927
10928         desc->len = sizeof(data->verdict);
10929
10930         return 0;
10931 }
10932
10933 static void nft_verdict_uninit(const struct nft_data *data)
10934 {
10935         struct nft_chain *chain;
10936
10937         switch (data->verdict.code) {
10938         case NFT_JUMP:
10939         case NFT_GOTO:
10940                 chain = data->verdict.chain;
10941                 nft_use_dec(&chain->use);
10942                 break;
10943         }
10944 }
10945
10946 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10947 {
10948         struct nlattr *nest;
10949
10950         nest = nla_nest_start_noflag(skb, type);
10951         if (!nest)
10952                 goto nla_put_failure;
10953
10954         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10955                 goto nla_put_failure;
10956
10957         switch (v->code) {
10958         case NFT_JUMP:
10959         case NFT_GOTO:
10960                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10961                                    v->chain->name))
10962                         goto nla_put_failure;
10963         }
10964         nla_nest_end(skb, nest);
10965         return 0;
10966
10967 nla_put_failure:
10968         return -1;
10969 }
10970
10971 static int nft_value_init(const struct nft_ctx *ctx,
10972                           struct nft_data *data, struct nft_data_desc *desc,
10973                           const struct nlattr *nla)
10974 {
10975         unsigned int len;
10976
10977         len = nla_len(nla);
10978         if (len == 0)
10979                 return -EINVAL;
10980         if (len > desc->size)
10981                 return -EOVERFLOW;
10982         if (desc->len) {
10983                 if (len != desc->len)
10984                         return -EINVAL;
10985         } else {
10986                 desc->len = len;
10987         }
10988
10989         nla_memcpy(data->data, nla, len);
10990
10991         return 0;
10992 }
10993
10994 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10995                           unsigned int len)
10996 {
10997         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10998 }
10999
11000 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
11001         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
11002         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
11003 };
11004
11005 /**
11006  *      nft_data_init - parse nf_tables data netlink attributes
11007  *
11008  *      @ctx: context of the expression using the data
11009  *      @data: destination struct nft_data
11010  *      @desc: data description
11011  *      @nla: netlink attribute containing data
11012  *
11013  *      Parse the netlink data attributes and initialize a struct nft_data.
11014  *      The type and length of data are returned in the data description.
11015  *
11016  *      The caller can indicate that it only wants to accept data of type
11017  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
11018  */
11019 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11020                   struct nft_data_desc *desc, const struct nlattr *nla)
11021 {
11022         struct nlattr *tb[NFTA_DATA_MAX + 1];
11023         int err;
11024
11025         if (WARN_ON_ONCE(!desc->size))
11026                 return -EINVAL;
11027
11028         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11029                                           nft_data_policy, NULL);
11030         if (err < 0)
11031                 return err;
11032
11033         if (tb[NFTA_DATA_VALUE]) {
11034                 if (desc->type != NFT_DATA_VALUE)
11035                         return -EINVAL;
11036
11037                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11038         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11039                 if (desc->type != NFT_DATA_VERDICT)
11040                         return -EINVAL;
11041
11042                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11043         } else {
11044                 err = -EINVAL;
11045         }
11046
11047         return err;
11048 }
11049 EXPORT_SYMBOL_GPL(nft_data_init);
11050
11051 /**
11052  *      nft_data_release - release a nft_data item
11053  *
11054  *      @data: struct nft_data to release
11055  *      @type: type of data
11056  *
11057  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11058  *      all others need to be released by calling this function.
11059  */
11060 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11061 {
11062         if (type < NFT_DATA_VERDICT)
11063                 return;
11064         switch (type) {
11065         case NFT_DATA_VERDICT:
11066                 return nft_verdict_uninit(data);
11067         default:
11068                 WARN_ON(1);
11069         }
11070 }
11071 EXPORT_SYMBOL_GPL(nft_data_release);
11072
11073 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11074                   enum nft_data_types type, unsigned int len)
11075 {
11076         struct nlattr *nest;
11077         int err;
11078
11079         nest = nla_nest_start_noflag(skb, attr);
11080         if (nest == NULL)
11081                 return -1;
11082
11083         switch (type) {
11084         case NFT_DATA_VALUE:
11085                 err = nft_value_dump(skb, data, len);
11086                 break;
11087         case NFT_DATA_VERDICT:
11088                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11089                 break;
11090         default:
11091                 err = -EINVAL;
11092                 WARN_ON(1);
11093         }
11094
11095         nla_nest_end(skb, nest);
11096         return err;
11097 }
11098 EXPORT_SYMBOL_GPL(nft_data_dump);
11099
11100 int __nft_release_basechain(struct nft_ctx *ctx)
11101 {
11102         struct nft_rule *rule, *nr;
11103
11104         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11105                 return 0;
11106
11107         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11108         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11109                 list_del(&rule->list);
11110                 nft_use_dec(&ctx->chain->use);
11111                 nf_tables_rule_release(ctx, rule);
11112         }
11113         nft_chain_del(ctx->chain);
11114         nft_use_dec(&ctx->table->use);
11115         nf_tables_chain_destroy(ctx);
11116
11117         return 0;
11118 }
11119 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11120
11121 static void __nft_release_hook(struct net *net, struct nft_table *table)
11122 {
11123         struct nft_flowtable *flowtable;
11124         struct nft_chain *chain;
11125
11126         list_for_each_entry(chain, &table->chains, list)
11127                 __nf_tables_unregister_hook(net, table, chain, true);
11128         list_for_each_entry(flowtable, &table->flowtables, list)
11129                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11130                                                      true);
11131 }
11132
11133 static void __nft_release_hooks(struct net *net)
11134 {
11135         struct nftables_pernet *nft_net = nft_pernet(net);
11136         struct nft_table *table;
11137
11138         list_for_each_entry(table, &nft_net->tables, list) {
11139                 if (nft_table_has_owner(table))
11140                         continue;
11141
11142                 __nft_release_hook(net, table);
11143         }
11144 }
11145
11146 static void __nft_release_table(struct net *net, struct nft_table *table)
11147 {
11148         struct nft_flowtable *flowtable, *nf;
11149         struct nft_chain *chain, *nc;
11150         struct nft_object *obj, *ne;
11151         struct nft_rule *rule, *nr;
11152         struct nft_set *set, *ns;
11153         struct nft_ctx ctx = {
11154                 .net    = net,
11155                 .family = NFPROTO_NETDEV,
11156         };
11157
11158         ctx.family = table->family;
11159         ctx.table = table;
11160         list_for_each_entry(chain, &table->chains, list) {
11161                 if (nft_chain_binding(chain))
11162                         continue;
11163
11164                 ctx.chain = chain;
11165                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11166                         list_del(&rule->list);
11167                         nft_use_dec(&chain->use);
11168                         nf_tables_rule_release(&ctx, rule);
11169                 }
11170         }
11171         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11172                 list_del(&flowtable->list);
11173                 nft_use_dec(&table->use);
11174                 nf_tables_flowtable_destroy(flowtable);
11175         }
11176         list_for_each_entry_safe(set, ns, &table->sets, list) {
11177                 list_del(&set->list);
11178                 nft_use_dec(&table->use);
11179                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11180                         nft_map_deactivate(&ctx, set);
11181
11182                 nft_set_destroy(&ctx, set);
11183         }
11184         list_for_each_entry_safe(obj, ne, &table->objects, list) {
11185                 nft_obj_del(obj);
11186                 nft_use_dec(&table->use);
11187                 nft_obj_destroy(&ctx, obj);
11188         }
11189         list_for_each_entry_safe(chain, nc, &table->chains, list) {
11190                 ctx.chain = chain;
11191                 nft_chain_del(chain);
11192                 nft_use_dec(&table->use);
11193                 nf_tables_chain_destroy(&ctx);
11194         }
11195         nf_tables_table_destroy(&ctx);
11196 }
11197
11198 static void __nft_release_tables(struct net *net)
11199 {
11200         struct nftables_pernet *nft_net = nft_pernet(net);
11201         struct nft_table *table, *nt;
11202
11203         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11204                 if (nft_table_has_owner(table))
11205                         continue;
11206
11207                 list_del(&table->list);
11208
11209                 __nft_release_table(net, table);
11210         }
11211 }
11212
11213 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11214                             void *ptr)
11215 {
11216         struct nft_table *table, *to_delete[8];
11217         struct nftables_pernet *nft_net;
11218         struct netlink_notify *n = ptr;
11219         struct net *net = n->net;
11220         unsigned int deleted;
11221         bool restart = false;
11222         unsigned int gc_seq;
11223
11224         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11225                 return NOTIFY_DONE;
11226
11227         nft_net = nft_pernet(net);
11228         deleted = 0;
11229         mutex_lock(&nft_net->commit_mutex);
11230
11231         gc_seq = nft_gc_seq_begin(nft_net);
11232
11233         if (!list_empty(&nf_tables_destroy_list))
11234                 nf_tables_trans_destroy_flush_work();
11235 again:
11236         list_for_each_entry(table, &nft_net->tables, list) {
11237                 if (nft_table_has_owner(table) &&
11238                     n->portid == table->nlpid) {
11239                         __nft_release_hook(net, table);
11240                         list_del_rcu(&table->list);
11241                         to_delete[deleted++] = table;
11242                         if (deleted >= ARRAY_SIZE(to_delete))
11243                                 break;
11244                 }
11245         }
11246         if (deleted) {
11247                 restart = deleted >= ARRAY_SIZE(to_delete);
11248                 synchronize_rcu();
11249                 while (deleted)
11250                         __nft_release_table(net, to_delete[--deleted]);
11251
11252                 if (restart)
11253                         goto again;
11254         }
11255         nft_gc_seq_end(nft_net, gc_seq);
11256
11257         mutex_unlock(&nft_net->commit_mutex);
11258
11259         return NOTIFY_DONE;
11260 }
11261
11262 static struct notifier_block nft_nl_notifier = {
11263         .notifier_call  = nft_rcv_nl_event,
11264 };
11265
11266 static int __net_init nf_tables_init_net(struct net *net)
11267 {
11268         struct nftables_pernet *nft_net = nft_pernet(net);
11269
11270         INIT_LIST_HEAD(&nft_net->tables);
11271         INIT_LIST_HEAD(&nft_net->commit_list);
11272         INIT_LIST_HEAD(&nft_net->binding_list);
11273         INIT_LIST_HEAD(&nft_net->module_list);
11274         INIT_LIST_HEAD(&nft_net->notify_list);
11275         mutex_init(&nft_net->commit_mutex);
11276         nft_net->base_seq = 1;
11277         nft_net->gc_seq = 0;
11278         nft_net->validate_state = NFT_VALIDATE_SKIP;
11279
11280         return 0;
11281 }
11282
11283 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11284 {
11285         struct nftables_pernet *nft_net = nft_pernet(net);
11286
11287         mutex_lock(&nft_net->commit_mutex);
11288         __nft_release_hooks(net);
11289         mutex_unlock(&nft_net->commit_mutex);
11290 }
11291
11292 static void __net_exit nf_tables_exit_net(struct net *net)
11293 {
11294         struct nftables_pernet *nft_net = nft_pernet(net);
11295         unsigned int gc_seq;
11296
11297         mutex_lock(&nft_net->commit_mutex);
11298
11299         gc_seq = nft_gc_seq_begin(nft_net);
11300
11301         if (!list_empty(&nft_net->commit_list) ||
11302             !list_empty(&nft_net->module_list))
11303                 __nf_tables_abort(net, NFNL_ABORT_NONE);
11304
11305         __nft_release_tables(net);
11306
11307         nft_gc_seq_end(nft_net, gc_seq);
11308
11309         mutex_unlock(&nft_net->commit_mutex);
11310         WARN_ON_ONCE(!list_empty(&nft_net->tables));
11311         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11312         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11313 }
11314
11315 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11316 {
11317         flush_work(&trans_gc_work);
11318 }
11319
11320 static struct pernet_operations nf_tables_net_ops = {
11321         .init           = nf_tables_init_net,
11322         .pre_exit       = nf_tables_pre_exit_net,
11323         .exit           = nf_tables_exit_net,
11324         .exit_batch     = nf_tables_exit_batch,
11325         .id             = &nf_tables_net_id,
11326         .size           = sizeof(struct nftables_pernet),
11327 };
11328
11329 static int __init nf_tables_module_init(void)
11330 {
11331         int err;
11332
11333         err = register_pernet_subsys(&nf_tables_net_ops);
11334         if (err < 0)
11335                 return err;
11336
11337         err = nft_chain_filter_init();
11338         if (err < 0)
11339                 goto err_chain_filter;
11340
11341         err = nf_tables_core_module_init();
11342         if (err < 0)
11343                 goto err_core_module;
11344
11345         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11346         if (err < 0)
11347                 goto err_netdev_notifier;
11348
11349         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11350         if (err < 0)
11351                 goto err_rht_objname;
11352
11353         err = nft_offload_init();
11354         if (err < 0)
11355                 goto err_offload;
11356
11357         err = netlink_register_notifier(&nft_nl_notifier);
11358         if (err < 0)
11359                 goto err_netlink_notifier;
11360
11361         /* must be last */
11362         err = nfnetlink_subsys_register(&nf_tables_subsys);
11363         if (err < 0)
11364                 goto err_nfnl_subsys;
11365
11366         nft_chain_route_init();
11367
11368         return err;
11369
11370 err_nfnl_subsys:
11371         netlink_unregister_notifier(&nft_nl_notifier);
11372 err_netlink_notifier:
11373         nft_offload_exit();
11374 err_offload:
11375         rhltable_destroy(&nft_objname_ht);
11376 err_rht_objname:
11377         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11378 err_netdev_notifier:
11379         nf_tables_core_module_exit();
11380 err_core_module:
11381         nft_chain_filter_fini();
11382 err_chain_filter:
11383         unregister_pernet_subsys(&nf_tables_net_ops);
11384         return err;
11385 }
11386
11387 static void __exit nf_tables_module_exit(void)
11388 {
11389         nfnetlink_subsys_unregister(&nf_tables_subsys);
11390         netlink_unregister_notifier(&nft_nl_notifier);
11391         nft_offload_exit();
11392         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11393         nft_chain_filter_fini();
11394         nft_chain_route_fini();
11395         unregister_pernet_subsys(&nf_tables_net_ops);
11396         cancel_work_sync(&trans_gc_work);
11397         cancel_work_sync(&trans_destroy_work);
11398         rcu_barrier();
11399         rhltable_destroy(&nft_objname_ht);
11400         nf_tables_core_module_exit();
11401 }
11402
11403 module_init(nf_tables_module_init);
11404 module_exit(nf_tables_module_exit);
11405
11406 MODULE_LICENSE("GPL");
11407 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11408 MODULE_DESCRIPTION("Framework for packet filtering and classification");
11409 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);