net/sched/act_ct.c

   1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2 /* -
   3  * net/sched/act_ct.c  Connection Tracking action
   4  *
   5  * Authors:   Paul Blakey <paulb@mellanox.com>
   6  *            Yossi Kuperman <yossiku@mellanox.com>
   7  *            Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/skbuff.h>
  14 #include <linux/rtnetlink.h>
  15 #include <linux/pkt_cls.h>
  16 #include <linux/ip.h>
  17 #include <linux/ipv6.h>
  18 #include <linux/rhashtable.h>
  19 #include <net/netlink.h>
  20 #include <net/pkt_sched.h>
  21 #include <net/pkt_cls.h>
  22 #include <net/act_api.h>
  23 #include <net/ip.h>
  24 #include <net/ipv6_frag.h>
  25 #include <uapi/linux/tc_act/tc_ct.h>
  26 #include <net/tc_act/tc_ct.h>
  27 #include <net/tc_wrapper.h>
  28
  29 #include <net/netfilter/nf_flow_table.h>
  30 #include <net/netfilter/nf_conntrack.h>
  31 #include <net/netfilter/nf_conntrack_core.h>
  32 #include <net/netfilter/nf_conntrack_zones.h>
  33 #include <net/netfilter/nf_conntrack_helper.h>
  34 #include <net/netfilter/nf_conntrack_acct.h>
  35 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
  36 #include <net/netfilter/nf_conntrack_act_ct.h>
  37 #include <net/netfilter/nf_conntrack_seqadj.h>
  38 #include <uapi/linux/netfilter/nf_nat.h>
  39
  40 static struct workqueue_struct *act_ct_wq;
  41 static struct rhashtable zones_ht;
  42 static DEFINE_MUTEX(zones_mutex);
  43
  44 struct tcf_ct_flow_table {
  45         struct rhash_head node; /* In zones tables */
  46
  47         struct rcu_work rwork;
  48         struct nf_flowtable nf_ft;
  49         refcount_t ref;
  50         u16 zone;
  51
  52         bool dying;
  53 };
  54
  55 static const struct rhashtable_params zones_params = {
  56         .head_offset = offsetof(struct tcf_ct_flow_table, node),
  57         .key_offset = offsetof(struct tcf_ct_flow_table, zone),
  58         .key_len = sizeof_field(struct tcf_ct_flow_table, zone),
  59         .automatic_shrinking = true,
  60 };
  61
  62 static struct flow_action_entry *
  63 tcf_ct_flow_table_flow_action_get_next(struct flow_action *flow_action)
  64 {
  65         int i = flow_action->num_entries++;
  66
  67         return &flow_action->entries[i];
  68 }
  69
  70 static void tcf_ct_add_mangle_action(struct flow_action *action,
  71                                      enum flow_action_mangle_base htype,
  72                                      u32 offset,
  73                                      u32 mask,
  74                                      u32 val)
  75 {
  76         struct flow_action_entry *entry;
  77
  78         entry = tcf_ct_flow_table_flow_action_get_next(action);
  79         entry->id = FLOW_ACTION_MANGLE;
  80         entry->mangle.htype = htype;
  81         entry->mangle.mask = ~mask;
  82         entry->mangle.offset = offset;
  83         entry->mangle.val = val;
  84 }
  85
  86 /* The following nat helper functions check if the inverted reverse tuple
  87  * (target) is different then the current dir tuple - meaning nat for ports
  88  * and/or ip is needed, and add the relevant mangle actions.
  89  */
  90 static void
  91 tcf_ct_flow_table_add_action_nat_ipv4(const struct nf_conntrack_tuple *tuple,
  92                                       struct nf_conntrack_tuple target,
  93                                       struct flow_action *action)
  94 {
  95         if (memcmp(&target.src.u3, &tuple->src.u3, sizeof(target.src.u3)))
  96                 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP4,
  97                                          offsetof(struct iphdr, saddr),
  98                                          0xFFFFFFFF,
  99                                          be32_to_cpu(target.src.u3.ip));
 100         if (memcmp(&target.dst.u3, &tuple->dst.u3, sizeof(target.dst.u3)))
 101                 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP4,
 102                                          offsetof(struct iphdr, daddr),
 103                                          0xFFFFFFFF,
 104                                          be32_to_cpu(target.dst.u3.ip));
 105 }
 106
 107 static void
 108 tcf_ct_add_ipv6_addr_mangle_action(struct flow_action *action,
 109                                    union nf_inet_addr *addr,
 110                                    u32 offset)
 111 {
 112         int i;
 113
 114         for (i = 0; i < sizeof(struct in6_addr) / sizeof(u32); i++)
 115                 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP6,
 116                                          i * sizeof(u32) + offset,
 117                                          0xFFFFFFFF, be32_to_cpu(addr->ip6[i]));
 118 }
 119
 120 static void
 121 tcf_ct_flow_table_add_action_nat_ipv6(const struct nf_conntrack_tuple *tuple,
 122                                       struct nf_conntrack_tuple target,
 123                                       struct flow_action *action)
 124 {
 125         if (memcmp(&target.src.u3, &tuple->src.u3, sizeof(target.src.u3)))
 126                 tcf_ct_add_ipv6_addr_mangle_action(action, &target.src.u3,
 127                                                    offsetof(struct ipv6hdr,
 128                                                             saddr));
 129         if (memcmp(&target.dst.u3, &tuple->dst.u3, sizeof(target.dst.u3)))
 130                 tcf_ct_add_ipv6_addr_mangle_action(action, &target.dst.u3,
 131                                                    offsetof(struct ipv6hdr,
 132                                                             daddr));
 133 }
 134
 135 static void
 136 tcf_ct_flow_table_add_action_nat_tcp(const struct nf_conntrack_tuple *tuple,
 137                                      struct nf_conntrack_tuple target,
 138                                      struct flow_action *action)
 139 {
 140         __be16 target_src = target.src.u.tcp.port;
 141         __be16 target_dst = target.dst.u.tcp.port;
 142
 143         if (target_src != tuple->src.u.tcp.port)
 144                 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP,
 145                                          offsetof(struct tcphdr, source),
 146                                          0xFFFF, be16_to_cpu(target_src));
 147         if (target_dst != tuple->dst.u.tcp.port)
 148                 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP,
 149                                          offsetof(struct tcphdr, dest),
 150                                          0xFFFF, be16_to_cpu(target_dst));
 151 }
 152
 153 static void
 154 tcf_ct_flow_table_add_action_nat_udp(const struct nf_conntrack_tuple *tuple,
 155                                      struct nf_conntrack_tuple target,
 156                                      struct flow_action *action)
 157 {
 158         __be16 target_src = target.src.u.udp.port;
 159         __be16 target_dst = target.dst.u.udp.port;
 160
 161         if (target_src != tuple->src.u.udp.port)
 162                 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_UDP,
 163                                          offsetof(struct udphdr, source),
 164                                          0xFFFF, be16_to_cpu(target_src));
 165         if (target_dst != tuple->dst.u.udp.port)
 166                 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_UDP,
 167                                          offsetof(struct udphdr, dest),
 168                                          0xFFFF, be16_to_cpu(target_dst));
 169 }
 170
 171 static void tcf_ct_flow_table_add_action_meta(struct nf_conn *ct,
 172                                               enum ip_conntrack_dir dir,
 173                                               enum ip_conntrack_info ctinfo,
 174                                               struct flow_action *action)
 175 {
 176         struct nf_conn_labels *ct_labels;
 177         struct flow_action_entry *entry;
 178         u32 *act_ct_labels;
 179
 180         entry = tcf_ct_flow_table_flow_action_get_next(action);
 181         entry->id = FLOW_ACTION_CT_METADATA;
 182 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
 183         entry->ct_metadata.mark = READ_ONCE(ct->mark);
 184 #endif
 185         /* aligns with the CT reference on the SKB nf_ct_set */
 186         entry->ct_metadata.cookie = (unsigned long)ct | ctinfo;
 187         entry->ct_metadata.orig_dir = dir == IP_CT_DIR_ORIGINAL;
 188
 189         act_ct_labels = entry->ct_metadata.labels;
 190         ct_labels = nf_ct_labels_find(ct);
 191         if (ct_labels)
 192                 memcpy(act_ct_labels, ct_labels->bits, NF_CT_LABELS_MAX_SIZE);
 193         else
 194                 memset(act_ct_labels, 0, NF_CT_LABELS_MAX_SIZE);
 195 }
 196
 197 static int tcf_ct_flow_table_add_action_nat(struct net *net,
 198                                             struct nf_conn *ct,
 199                                             enum ip_conntrack_dir dir,
 200                                             struct flow_action *action)
 201 {
 202         const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
 203         struct nf_conntrack_tuple target;
 204
 205         if (!(ct->status & IPS_NAT_MASK))
 206                 return 0;
 207
 208         nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple);
 209
 210         switch (tuple->src.l3num) {
 211         case NFPROTO_IPV4:
 212                 tcf_ct_flow_table_add_action_nat_ipv4(tuple, target,
 213                                                       action);
 214                 break;
 215         case NFPROTO_IPV6:
 216                 tcf_ct_flow_table_add_action_nat_ipv6(tuple, target,
 217                                                       action);
 218                 break;
 219         default:
 220                 return -EOPNOTSUPP;
 221         }
 222
 223         switch (nf_ct_protonum(ct)) {
 224         case IPPROTO_TCP:
 225                 tcf_ct_flow_table_add_action_nat_tcp(tuple, target, action);
 226                 break;
 227         case IPPROTO_UDP:
 228                 tcf_ct_flow_table_add_action_nat_udp(tuple, target, action);
 229                 break;
 230         default:
 231                 return -EOPNOTSUPP;
 232         }
 233
 234         return 0;
 235 }
 236
 237 static int tcf_ct_flow_table_fill_actions(struct net *net,
 238                                           struct flow_offload *flow,
 239                                           enum flow_offload_tuple_dir tdir,
 240                                           struct nf_flow_rule *flow_rule)
 241 {
 242         struct flow_action *action = &flow_rule->rule->action;
 243         int num_entries = action->num_entries;
 244         struct nf_conn *ct = flow->ct;
 245         enum ip_conntrack_info ctinfo;
 246         enum ip_conntrack_dir dir;
 247         int i, err;
 248
 249         switch (tdir) {
 250         case FLOW_OFFLOAD_DIR_ORIGINAL:
 251                 dir = IP_CT_DIR_ORIGINAL;
 252                 ctinfo = test_bit(IPS_SEEN_REPLY_BIT, &ct->status) ?
 253                         IP_CT_ESTABLISHED : IP_CT_NEW;
 254                 if (ctinfo == IP_CT_ESTABLISHED)
 255                         set_bit(NF_FLOW_HW_ESTABLISHED, &flow->flags);
 256                 break;
 257         case FLOW_OFFLOAD_DIR_REPLY:
 258                 dir = IP_CT_DIR_REPLY;
 259                 ctinfo = IP_CT_ESTABLISHED_REPLY;
 260                 break;
 261         default:
 262                 return -EOPNOTSUPP;
 263         }
 264
 265         err = tcf_ct_flow_table_add_action_nat(net, ct, dir, action);
 266         if (err)
 267                 goto err_nat;
 268
 269         tcf_ct_flow_table_add_action_meta(ct, dir, ctinfo, action);
 270         return 0;
 271
 272 err_nat:
 273         /* Clear filled actions */
 274         for (i = num_entries; i < action->num_entries; i++)
 275                 memset(&action->entries[i], 0, sizeof(action->entries[i]));
 276         action->num_entries = num_entries;
 277
 278         return err;
 279 }
 280
 281 static bool tcf_ct_flow_is_outdated(const struct flow_offload *flow)
 282 {
 283         return test_bit(IPS_SEEN_REPLY_BIT, &flow->ct->status) &&
 284                test_bit(IPS_HW_OFFLOAD_BIT, &flow->ct->status) &&
 285                !test_bit(NF_FLOW_HW_PENDING, &flow->flags) &&
 286                !test_bit(NF_FLOW_HW_ESTABLISHED, &flow->flags);
 287 }
 288
 289 static void tcf_ct_flow_table_get_ref(struct tcf_ct_flow_table *ct_ft);
 290
 291 static void tcf_ct_nf_get(struct nf_flowtable *ft)
 292 {
 293         struct tcf_ct_flow_table *ct_ft =
 294                 container_of(ft, struct tcf_ct_flow_table, nf_ft);
 295
 296         tcf_ct_flow_table_get_ref(ct_ft);
 297 }
 298
 299 static void tcf_ct_flow_table_put(struct tcf_ct_flow_table *ct_ft);
 300
 301 static void tcf_ct_nf_put(struct nf_flowtable *ft)
 302 {
 303         struct tcf_ct_flow_table *ct_ft =
 304                 container_of(ft, struct tcf_ct_flow_table, nf_ft);
 305
 306         tcf_ct_flow_table_put(ct_ft);
 307 }
 308
 309 static struct nf_flowtable_type flowtable_ct = {
 310         .gc             = tcf_ct_flow_is_outdated,
 311         .action         = tcf_ct_flow_table_fill_actions,
 312         .get            = tcf_ct_nf_get,
 313         .put            = tcf_ct_nf_put,
 314         .owner          = THIS_MODULE,
 315 };
 316
 317 static int tcf_ct_flow_table_get(struct net *net, struct tcf_ct_params *params)
 318 {
 319         struct tcf_ct_flow_table *ct_ft;
 320         int err = -ENOMEM;
 321
 322         mutex_lock(&zones_mutex);
 323         ct_ft = rhashtable_lookup_fast(&zones_ht, &params->zone, zones_params);
 324         if (ct_ft && refcount_inc_not_zero(&ct_ft->ref))
 325                 goto out_unlock;
 326
 327         ct_ft = kzalloc(sizeof(*ct_ft), GFP_KERNEL);
 328         if (!ct_ft)
 329                 goto err_alloc;
 330         refcount_set(&ct_ft->ref, 1);
 331
 332         ct_ft->zone = params->zone;
 333         err = rhashtable_insert_fast(&zones_ht, &ct_ft->node, zones_params);
 334         if (err)
 335                 goto err_insert;
 336
 337         ct_ft->nf_ft.type = &flowtable_ct;
 338         ct_ft->nf_ft.flags |= NF_FLOWTABLE_HW_OFFLOAD |
 339                               NF_FLOWTABLE_COUNTER;
 340         err = nf_flow_table_init(&ct_ft->nf_ft);
 341         if (err)
 342                 goto err_init;
 343         write_pnet(&ct_ft->nf_ft.net, net);
 344
 345         __module_get(THIS_MODULE);
 346 out_unlock:
 347         params->ct_ft = ct_ft;
 348         params->nf_ft = &ct_ft->nf_ft;
 349         mutex_unlock(&zones_mutex);
 350
 351         return 0;
 352
 353 err_init:
 354         rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params);
 355 err_insert:
 356         kfree(ct_ft);
 357 err_alloc:
 358         mutex_unlock(&zones_mutex);
 359         return err;
 360 }
 361
 362 static void tcf_ct_flow_table_get_ref(struct tcf_ct_flow_table *ct_ft)
 363 {
 364         refcount_inc(&ct_ft->ref);
 365 }
 366
 367 static void tcf_ct_flow_table_cleanup_work(struct work_struct *work)
 368 {
 369         struct tcf_ct_flow_table *ct_ft;
 370         struct flow_block *block;
 371
 372         ct_ft = container_of(to_rcu_work(work), struct tcf_ct_flow_table,
 373                              rwork);
 374         nf_flow_table_free(&ct_ft->nf_ft);
 375
 376         block = &ct_ft->nf_ft.flow_block;
 377         down_write(&ct_ft->nf_ft.flow_block_lock);
 378         WARN_ON(!list_empty(&block->cb_list));
 379         up_write(&ct_ft->nf_ft.flow_block_lock);
 380         kfree(ct_ft);
 381
 382         module_put(THIS_MODULE);
 383 }
 384
 385 static void tcf_ct_flow_table_put(struct tcf_ct_flow_table *ct_ft)
 386 {
 387         if (refcount_dec_and_test(&ct_ft->ref)) {
 388                 rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params);
 389                 INIT_RCU_WORK(&ct_ft->rwork, tcf_ct_flow_table_cleanup_work);
 390                 queue_rcu_work(act_ct_wq, &ct_ft->rwork);
 391         }
 392 }
 393
 394 static void tcf_ct_flow_tc_ifidx(struct flow_offload *entry,
 395                                  struct nf_conn_act_ct_ext *act_ct_ext, u8 dir)
 396 {
 397         entry->tuplehash[dir].tuple.xmit_type = FLOW_OFFLOAD_XMIT_TC;
 398         entry->tuplehash[dir].tuple.tc.iifidx = act_ct_ext->ifindex[dir];
 399 }
 400
 401 static void tcf_ct_flow_ct_ext_ifidx_update(struct flow_offload *entry)
 402 {
 403         struct nf_conn_act_ct_ext *act_ct_ext;
 404
 405         act_ct_ext = nf_conn_act_ct_ext_find(entry->ct);
 406         if (act_ct_ext) {
 407                 tcf_ct_flow_tc_ifidx(entry, act_ct_ext, FLOW_OFFLOAD_DIR_ORIGINAL);
 408                 tcf_ct_flow_tc_ifidx(entry, act_ct_ext, FLOW_OFFLOAD_DIR_REPLY);
 409         }
 410 }
 411
 412 static void tcf_ct_flow_table_add(struct tcf_ct_flow_table *ct_ft,
 413                                   struct nf_conn *ct,
 414                                   bool tcp, bool bidirectional)
 415 {
 416         struct nf_conn_act_ct_ext *act_ct_ext;
 417         struct flow_offload *entry;
 418         int err;
 419
 420         if (test_and_set_bit(IPS_OFFLOAD_BIT, &ct->status))
 421                 return;
 422
 423         entry = flow_offload_alloc(ct);
 424         if (!entry) {
 425                 WARN_ON_ONCE(1);
 426                 goto err_alloc;
 427         }
 428
 429         if (tcp) {
 430                 ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
 431                 ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
 432         }
 433         if (bidirectional)
 434                 __set_bit(NF_FLOW_HW_BIDIRECTIONAL, &entry->flags);
 435
 436         act_ct_ext = nf_conn_act_ct_ext_find(ct);
 437         if (act_ct_ext) {
 438                 tcf_ct_flow_tc_ifidx(entry, act_ct_ext, FLOW_OFFLOAD_DIR_ORIGINAL);
 439                 tcf_ct_flow_tc_ifidx(entry, act_ct_ext, FLOW_OFFLOAD_DIR_REPLY);
 440         }
 441
 442         err = flow_offload_add(&ct_ft->nf_ft, entry);
 443         if (err)
 444                 goto err_add;
 445
 446         return;
 447
 448 err_add:
 449         flow_offload_free(entry);
 450 err_alloc:
 451         clear_bit(IPS_OFFLOAD_BIT, &ct->status);
 452 }
 453
 454 static void tcf_ct_flow_table_process_conn(struct tcf_ct_flow_table *ct_ft,
 455                                            struct nf_conn *ct,
 456                                            enum ip_conntrack_info ctinfo)
 457 {
 458         bool tcp = false, bidirectional = true;
 459
 460         switch (nf_ct_protonum(ct)) {
 461         case IPPROTO_TCP:
 462                 if ((ctinfo != IP_CT_ESTABLISHED &&
 463                      ctinfo != IP_CT_ESTABLISHED_REPLY) ||
 464                     !test_bit(IPS_ASSURED_BIT, &ct->status) ||
 465                     ct->proto.tcp.state != TCP_CONNTRACK_ESTABLISHED)
 466                         return;
 467
 468                 tcp = true;
 469                 break;
 470         case IPPROTO_UDP:
 471                 if (!nf_ct_is_confirmed(ct))
 472                         return;
 473                 if (!test_bit(IPS_ASSURED_BIT, &ct->status))
 474                         bidirectional = false;
 475                 break;
 476 #ifdef CONFIG_NF_CT_PROTO_GRE
 477         case IPPROTO_GRE: {
 478                 struct nf_conntrack_tuple *tuple;
 479
 480                 if ((ctinfo != IP_CT_ESTABLISHED &&
 481                      ctinfo != IP_CT_ESTABLISHED_REPLY) ||
 482                     !test_bit(IPS_ASSURED_BIT, &ct->status) ||
 483                     ct->status & IPS_NAT_MASK)
 484                         return;
 485
 486                 tuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
 487                 /* No support for GRE v1 */
 488                 if (tuple->src.u.gre.key || tuple->dst.u.gre.key)
 489                         return;
 490                 break;
 491         }
 492 #endif
 493         default:
 494                 return;
 495         }
 496
 497         if (nf_ct_ext_exist(ct, NF_CT_EXT_HELPER) ||
 498             ct->status & IPS_SEQ_ADJUST)
 499                 return;
 500
 501         tcf_ct_flow_table_add(ct_ft, ct, tcp, bidirectional);
 502 }
 503
 504 static bool
 505 tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb,
 506                                   struct flow_offload_tuple *tuple,
 507                                   struct tcphdr **tcph)
 508 {
 509         struct flow_ports *ports;
 510         unsigned int thoff;
 511         struct iphdr *iph;
 512         size_t hdrsize;
 513         u8 ipproto;
 514
 515         if (!pskb_network_may_pull(skb, sizeof(*iph)))
 516                 return false;
 517
 518         iph = ip_hdr(skb);
 519         thoff = iph->ihl * 4;
 520
 521         if (ip_is_fragment(iph) ||
 522             unlikely(thoff != sizeof(struct iphdr)))
 523                 return false;
 524
 525         ipproto = iph->protocol;
 526         switch (ipproto) {
 527         case IPPROTO_TCP:
 528                 hdrsize = sizeof(struct tcphdr);
 529                 break;
 530         case IPPROTO_UDP:
 531                 hdrsize = sizeof(*ports);
 532                 break;
 533 #ifdef CONFIG_NF_CT_PROTO_GRE
 534         case IPPROTO_GRE:
 535                 hdrsize = sizeof(struct gre_base_hdr);
 536                 break;
 537 #endif
 538         default:
 539                 return false;
 540         }
 541
 542         if (iph->ttl <= 1)
 543                 return false;
 544
 545         if (!pskb_network_may_pull(skb, thoff + hdrsize))
 546                 return false;
 547
 548         switch (ipproto) {
 549         case IPPROTO_TCP:
 550                 *tcph = (void *)(skb_network_header(skb) + thoff);
 551                 fallthrough;
 552         case IPPROTO_UDP:
 553                 ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
 554                 tuple->src_port = ports->source;
 555                 tuple->dst_port = ports->dest;
 556                 break;
 557         case IPPROTO_GRE: {
 558                 struct gre_base_hdr *greh;
 559
 560                 greh = (struct gre_base_hdr *)(skb_network_header(skb) + thoff);
 561                 if ((greh->flags & GRE_VERSION) != GRE_VERSION_0)
 562                         return false;
 563                 break;
 564         }
 565         }
 566
 567         iph = ip_hdr(skb);
 568
 569         tuple->src_v4.s_addr = iph->saddr;
 570         tuple->dst_v4.s_addr = iph->daddr;
 571         tuple->l3proto = AF_INET;
 572         tuple->l4proto = ipproto;
 573
 574         return true;
 575 }
 576
 577 static bool
 578 tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff *skb,
 579                                   struct flow_offload_tuple *tuple,
 580                                   struct tcphdr **tcph)
 581 {
 582         struct flow_ports *ports;
 583         struct ipv6hdr *ip6h;
 584         unsigned int thoff;
 585         size_t hdrsize;
 586         u8 nexthdr;
 587
 588         if (!pskb_network_may_pull(skb, sizeof(*ip6h)))
 589                 return false;
 590
 591         ip6h = ipv6_hdr(skb);
 592         thoff = sizeof(*ip6h);
 593
 594         nexthdr = ip6h->nexthdr;
 595         switch (nexthdr) {
 596         case IPPROTO_TCP:
 597                 hdrsize = sizeof(struct tcphdr);
 598                 break;
 599         case IPPROTO_UDP:
 600                 hdrsize = sizeof(*ports);
 601                 break;
 602 #ifdef CONFIG_NF_CT_PROTO_GRE
 603         case IPPROTO_GRE:
 604                 hdrsize = sizeof(struct gre_base_hdr);
 605                 break;
 606 #endif
 607         default:
 608                 return false;
 609         }
 610
 611         if (ip6h->hop_limit <= 1)
 612                 return false;
 613
 614         if (!pskb_network_may_pull(skb, thoff + hdrsize))
 615                 return false;
 616
 617         switch (nexthdr) {
 618         case IPPROTO_TCP:
 619                 *tcph = (void *)(skb_network_header(skb) + thoff);
 620                 fallthrough;
 621         case IPPROTO_UDP:
 622                 ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
 623                 tuple->src_port = ports->source;
 624                 tuple->dst_port = ports->dest;
 625                 break;
 626         case IPPROTO_GRE: {
 627                 struct gre_base_hdr *greh;
 628
 629                 greh = (struct gre_base_hdr *)(skb_network_header(skb) + thoff);
 630                 if ((greh->flags & GRE_VERSION) != GRE_VERSION_0)
 631                         return false;
 632                 break;
 633         }
 634         }
 635
 636         ip6h = ipv6_hdr(skb);
 637
 638         tuple->src_v6 = ip6h->saddr;
 639         tuple->dst_v6 = ip6h->daddr;
 640         tuple->l3proto = AF_INET6;
 641         tuple->l4proto = nexthdr;
 642
 643         return true;
 644 }
 645
 646 static bool tcf_ct_flow_table_lookup(struct tcf_ct_params *p,
 647                                      struct sk_buff *skb,
 648                                      u8 family)
 649 {
 650         struct nf_flowtable *nf_ft = &p->ct_ft->nf_ft;
 651         struct flow_offload_tuple_rhash *tuplehash;
 652         struct flow_offload_tuple tuple = {};
 653         enum ip_conntrack_info ctinfo;
 654         struct tcphdr *tcph = NULL;
 655         bool force_refresh = false;
 656         struct flow_offload *flow;
 657         struct nf_conn *ct;
 658         u8 dir;
 659
 660         switch (family) {
 661         case NFPROTO_IPV4:
 662                 if (!tcf_ct_flow_table_fill_tuple_ipv4(skb, &tuple, &tcph))
 663                         return false;
 664                 break;
 665         case NFPROTO_IPV6:
 666                 if (!tcf_ct_flow_table_fill_tuple_ipv6(skb, &tuple, &tcph))
 667                         return false;
 668                 break;
 669         default:
 670                 return false;
 671         }
 672
 673         tuplehash = flow_offload_lookup(nf_ft, &tuple);
 674         if (!tuplehash)
 675                 return false;
 676
 677         dir = tuplehash->tuple.dir;
 678         flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
 679         ct = flow->ct;
 680
 681         if (dir == FLOW_OFFLOAD_DIR_REPLY &&
 682             !test_bit(NF_FLOW_HW_BIDIRECTIONAL, &flow->flags)) {
 683                 /* Only offload reply direction after connection became
 684                  * assured.
 685                  */
 686                 if (test_bit(IPS_ASSURED_BIT, &ct->status))
 687                         set_bit(NF_FLOW_HW_BIDIRECTIONAL, &flow->flags);
 688                 else if (test_bit(NF_FLOW_HW_ESTABLISHED, &flow->flags))
 689                         /* If flow_table flow has already been updated to the
 690                          * established state, then don't refresh.
 691                          */
 692                         return false;
 693                 force_refresh = true;
 694         }
 695
 696         if (tcph && (unlikely(tcph->fin || tcph->rst))) {
 697                 flow_offload_teardown(flow);
 698                 return false;
 699         }
 700
 701         if (dir == FLOW_OFFLOAD_DIR_ORIGINAL)
 702                 ctinfo = test_bit(IPS_SEEN_REPLY_BIT, &ct->status) ?
 703                         IP_CT_ESTABLISHED : IP_CT_NEW;
 704         else
 705                 ctinfo = IP_CT_ESTABLISHED_REPLY;
 706
 707         nf_conn_act_ct_ext_fill(skb, ct, ctinfo);
 708         tcf_ct_flow_ct_ext_ifidx_update(flow);
 709         flow_offload_refresh(nf_ft, flow, force_refresh);
 710         if (!test_bit(IPS_ASSURED_BIT, &ct->status)) {
 711                 /* Process this flow in SW to allow promoting to ASSURED */
 712                 return false;
 713         }
 714
 715         nf_conntrack_get(&ct->ct_general);
 716         nf_ct_set(skb, ct, ctinfo);
 717         if (nf_ft->flags & NF_FLOWTABLE_COUNTER)
 718                 nf_ct_acct_update(ct, dir, skb->len);
 719
 720         return true;
 721 }
 722
 723 static int tcf_ct_flow_tables_init(void)
 724 {
 725         return rhashtable_init(&zones_ht, &zones_params);
 726 }
 727
 728 static void tcf_ct_flow_tables_uninit(void)
 729 {
 730         rhashtable_destroy(&zones_ht);
 731 }
 732
 733 static struct tc_action_ops act_ct_ops;
 734
 735 struct tc_ct_action_net {
 736         struct tc_action_net tn; /* Must be first */
 737 };
 738
 739 /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
 740 static bool tcf_ct_skb_nfct_cached(struct net *net, struct sk_buff *skb,
 741                                    struct tcf_ct_params *p)
 742 {
 743         enum ip_conntrack_info ctinfo;
 744         struct nf_conn *ct;
 745
 746         ct = nf_ct_get(skb, &ctinfo);
 747         if (!ct)
 748                 return false;
 749         if (!net_eq(net, read_pnet(&ct->ct_net)))
 750                 goto drop_ct;
 751         if (nf_ct_zone(ct)->id != p->zone)
 752                 goto drop_ct;
 753         if (p->helper) {
 754                 struct nf_conn_help *help;
 755
 756                 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
 757                 if (help && rcu_access_pointer(help->helper) != p->helper)
 758                         goto drop_ct;
 759         }
 760
 761         /* Force conntrack entry direction. */
 762         if ((p->ct_action & TCA_CT_ACT_FORCE) &&
 763             CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
 764                 if (nf_ct_is_confirmed(ct))
 765                         nf_ct_kill(ct);
 766
 767                 goto drop_ct;
 768         }
 769
 770         return true;
 771
 772 drop_ct:
 773         nf_ct_put(ct);
 774         nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
 775
 776         return false;
 777 }
 778
 779 static u8 tcf_ct_skb_nf_family(struct sk_buff *skb)
 780 {
 781         u8 family = NFPROTO_UNSPEC;
 782
 783         switch (skb_protocol(skb, true)) {
 784         case htons(ETH_P_IP):
 785                 family = NFPROTO_IPV4;
 786                 break;
 787         case htons(ETH_P_IPV6):
 788                 family = NFPROTO_IPV6;
 789                 break;
 790         default:
 791                 break;
 792         }
 793
 794         return family;
 795 }
 796
 797 static int tcf_ct_ipv4_is_fragment(struct sk_buff *skb, bool *frag)
 798 {
 799         unsigned int len;
 800
 801         len =  skb_network_offset(skb) + sizeof(struct iphdr);
 802         if (unlikely(skb->len < len))
 803                 return -EINVAL;
 804         if (unlikely(!pskb_may_pull(skb, len)))
 805                 return -ENOMEM;
 806
 807         *frag = ip_is_fragment(ip_hdr(skb));
 808         return 0;
 809 }
 810
 811 static int tcf_ct_ipv6_is_fragment(struct sk_buff *skb, bool *frag)
 812 {
 813         unsigned int flags = 0, len, payload_ofs = 0;
 814         unsigned short frag_off;
 815         int nexthdr;
 816
 817         len =  skb_network_offset(skb) + sizeof(struct ipv6hdr);
 818         if (unlikely(skb->len < len))
 819                 return -EINVAL;
 820         if (unlikely(!pskb_may_pull(skb, len)))
 821                 return -ENOMEM;
 822
 823         nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
 824         if (unlikely(nexthdr < 0))
 825                 return -EPROTO;
 826
 827         *frag = flags & IP6_FH_F_FRAG;
 828         return 0;
 829 }
 830
 831 static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
 832                                    u8 family, u16 zone, bool *defrag)
 833 {
 834         enum ip_conntrack_info ctinfo;
 835         struct nf_conn *ct;
 836         int err = 0;
 837         bool frag;
 838         u8 proto;
 839         u16 mru;
 840
 841         /* Previously seen (loopback)? Ignore. */
 842         ct = nf_ct_get(skb, &ctinfo);
 843         if ((ct && !nf_ct_is_template(ct)) || ctinfo == IP_CT_UNTRACKED)
 844                 return 0;
 845
 846         if (family == NFPROTO_IPV4)
 847                 err = tcf_ct_ipv4_is_fragment(skb, &frag);
 848         else
 849                 err = tcf_ct_ipv6_is_fragment(skb, &frag);
 850         if (err || !frag)
 851                 return err;
 852
 853         err = nf_ct_handle_fragments(net, skb, zone, family, &proto, &mru);
 854         if (err)
 855                 return err;
 856
 857         *defrag = true;
 858         tc_skb_cb(skb)->mru = mru;
 859
 860         return 0;
 861 }
 862
 863 static void tcf_ct_params_free(struct tcf_ct_params *params)
 864 {
 865         if (params->helper) {
 866 #if IS_ENABLED(CONFIG_NF_NAT)
 867                 if (params->ct_action & TCA_CT_ACT_NAT)
 868                         nf_nat_helper_put(params->helper);
 869 #endif
 870                 nf_conntrack_helper_put(params->helper);
 871         }
 872         if (params->ct_ft)
 873                 tcf_ct_flow_table_put(params->ct_ft);
 874         if (params->tmpl) {
 875                 if (params->put_labels)
 876                         nf_connlabels_put(nf_ct_net(params->tmpl));
 877
 878                 nf_ct_put(params->tmpl);
 879         }
 880
 881         kfree(params);
 882 }
 883
 884 static void tcf_ct_params_free_rcu(struct rcu_head *head)
 885 {
 886         struct tcf_ct_params *params;
 887
 888         params = container_of(head, struct tcf_ct_params, rcu);
 889         tcf_ct_params_free(params);
 890 }
 891
 892 static void tcf_ct_act_set_mark(struct nf_conn *ct, u32 mark, u32 mask)
 893 {
 894 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
 895         u32 new_mark;
 896
 897         if (!mask)
 898                 return;
 899
 900         new_mark = mark | (READ_ONCE(ct->mark) & ~(mask));
 901         if (READ_ONCE(ct->mark) != new_mark) {
 902                 WRITE_ONCE(ct->mark, new_mark);
 903                 if (nf_ct_is_confirmed(ct))
 904                         nf_conntrack_event_cache(IPCT_MARK, ct);
 905         }
 906 #endif
 907 }
 908
 909 static void tcf_ct_act_set_labels(struct nf_conn *ct,
 910                                   u32 *labels,
 911                                   u32 *labels_m)
 912 {
 913 #if IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)
 914         size_t labels_sz = sizeof_field(struct tcf_ct_params, labels);
 915
 916         if (!memchr_inv(labels_m, 0, labels_sz))
 917                 return;
 918
 919         nf_connlabels_replace(ct, labels, labels_m, 4);
 920 #endif
 921 }
 922
 923 static int tcf_ct_act_nat(struct sk_buff *skb,
 924                           struct nf_conn *ct,
 925                           enum ip_conntrack_info ctinfo,
 926                           int ct_action,
 927                           struct nf_nat_range2 *range,
 928                           bool commit)
 929 {
 930 #if IS_ENABLED(CONFIG_NF_NAT)
 931         int err, action = 0;
 932
 933         if (!(ct_action & TCA_CT_ACT_NAT))
 934                 return NF_ACCEPT;
 935         if (ct_action & TCA_CT_ACT_NAT_SRC)
 936                 action |= BIT(NF_NAT_MANIP_SRC);
 937         if (ct_action & TCA_CT_ACT_NAT_DST)
 938                 action |= BIT(NF_NAT_MANIP_DST);
 939
 940         err = nf_ct_nat(skb, ct, ctinfo, &action, range, commit);
 941
 942         if (action & BIT(NF_NAT_MANIP_SRC))
 943                 tc_skb_cb(skb)->post_ct_snat = 1;
 944         if (action & BIT(NF_NAT_MANIP_DST))
 945                 tc_skb_cb(skb)->post_ct_dnat = 1;
 946
 947         return err;
 948 #else
 949         return NF_ACCEPT;
 950 #endif
 951 }
 952
 953 TC_INDIRECT_SCOPE int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
 954                                  struct tcf_result *res)
 955 {
 956         struct net *net = dev_net(skb->dev);
 957         enum ip_conntrack_info ctinfo;
 958         struct tcf_ct *c = to_ct(a);
 959         struct nf_conn *tmpl = NULL;
 960         struct nf_hook_state state;
 961         bool cached, commit, clear;
 962         int nh_ofs, err, retval;
 963         struct tcf_ct_params *p;
 964         bool add_helper = false;
 965         bool skip_add = false;
 966         bool defrag = false;
 967         struct nf_conn *ct;
 968         u8 family;
 969
 970         p = rcu_dereference_bh(c->params);
 971
 972         retval = READ_ONCE(c->tcf_action);
 973         commit = p->ct_action & TCA_CT_ACT_COMMIT;
 974         clear = p->ct_action & TCA_CT_ACT_CLEAR;
 975         tmpl = p->tmpl;
 976
 977         tcf_lastuse_update(&c->tcf_tm);
 978         tcf_action_update_bstats(&c->common, skb);
 979
 980         if (clear) {
 981                 tc_skb_cb(skb)->post_ct = false;
 982                 ct = nf_ct_get(skb, &ctinfo);
 983                 if (ct) {
 984                         nf_ct_put(ct);
 985                         nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
 986                 }
 987
 988                 goto out_clear;
 989         }
 990
 991         family = tcf_ct_skb_nf_family(skb);
 992         if (family == NFPROTO_UNSPEC)
 993                 goto drop;
 994
 995         /* The conntrack module expects to be working at L3.
 996          * We also try to pull the IPv4/6 header to linear area
 997          */
 998         nh_ofs = skb_network_offset(skb);
 999         skb_pull_rcsum(skb, nh_ofs);
1000         err = tcf_ct_handle_fragments(net, skb, family, p->zone, &defrag);
1001         if (err)
1002                 goto out_frag;
1003
1004         err = nf_ct_skb_network_trim(skb, family);
1005         if (err)
1006                 goto drop;
1007
1008         /* If we are recirculating packets to match on ct fields and
1009          * committing with a separate ct action, then we don't need to
1010          * actually run the packet through conntrack twice unless it's for a
1011          * different zone.
1012          */
1013         cached = tcf_ct_skb_nfct_cached(net, skb, p);
1014         if (!cached) {
1015                 if (tcf_ct_flow_table_lookup(p, skb, family)) {
1016                         skip_add = true;
1017                         goto do_nat;
1018                 }
1019
1020                 /* Associate skb with specified zone. */
1021                 if (tmpl) {
1022                         nf_conntrack_put(skb_nfct(skb));
1023                         nf_conntrack_get(&tmpl->ct_general);
1024                         nf_ct_set(skb, tmpl, IP_CT_NEW);
1025                 }
1026
1027                 state.hook = NF_INET_PRE_ROUTING;
1028                 state.net = net;
1029                 state.pf = family;
1030                 err = nf_conntrack_in(skb, &state);
1031                 if (err != NF_ACCEPT)
1032                         goto out_push;
1033         }
1034
1035 do_nat:
1036         ct = nf_ct_get(skb, &ctinfo);
1037         if (!ct)
1038                 goto out_push;
1039         nf_ct_deliver_cached_events(ct);
1040         nf_conn_act_ct_ext_fill(skb, ct, ctinfo);
1041
1042         err = tcf_ct_act_nat(skb, ct, ctinfo, p->ct_action, &p->range, commit);
1043         if (err != NF_ACCEPT)
1044                 goto drop;
1045
1046         if (!nf_ct_is_confirmed(ct) && commit && p->helper && !nfct_help(ct)) {
1047                 err = __nf_ct_try_assign_helper(ct, p->tmpl, GFP_ATOMIC);
1048                 if (err)
1049                         goto drop;
1050                 add_helper = true;
1051                 if (p->ct_action & TCA_CT_ACT_NAT && !nfct_seqadj(ct)) {
1052                         if (!nfct_seqadj_ext_add(ct))
1053                                 goto drop;
1054                 }
1055         }
1056
1057         if (nf_ct_is_confirmed(ct) ? ((!cached && !skip_add) || add_helper) : commit) {
1058                 if (nf_ct_helper(skb, ct, ctinfo, family) != NF_ACCEPT)
1059                         goto drop;
1060         }
1061
1062         if (commit) {
1063                 tcf_ct_act_set_mark(ct, p->mark, p->mark_mask);
1064                 tcf_ct_act_set_labels(ct, p->labels, p->labels_mask);
1065
1066                 if (!nf_ct_is_confirmed(ct))
1067                         nf_conn_act_ct_ext_add(skb, ct, ctinfo);
1068
1069                 /* This will take care of sending queued events
1070                  * even if the connection is already confirmed.
1071                  */
1072                 if (nf_conntrack_confirm(skb) != NF_ACCEPT)
1073                         goto drop;
1074         }
1075
1076         if (!skip_add)
1077                 tcf_ct_flow_table_process_conn(p->ct_ft, ct, ctinfo);
1078
1079 out_push:
1080         skb_push_rcsum(skb, nh_ofs);
1081
1082         tc_skb_cb(skb)->post_ct = true;
1083         tc_skb_cb(skb)->zone = p->zone;
1084 out_clear:
1085         if (defrag)
1086                 qdisc_skb_cb(skb)->pkt_len = skb->len;
1087         return retval;
1088
1089 out_frag:
1090         if (err != -EINPROGRESS)
1091                 tcf_action_inc_drop_qstats(&c->common);
1092         return TC_ACT_CONSUMED;
1093
1094 drop:
1095         tcf_action_inc_drop_qstats(&c->common);
1096         return TC_ACT_SHOT;
1097 }
1098
1099 static const struct nla_policy ct_policy[TCA_CT_MAX + 1] = {
1100         [TCA_CT_ACTION] = { .type = NLA_U16 },
1101         [TCA_CT_PARMS] = NLA_POLICY_EXACT_LEN(sizeof(struct tc_ct)),
1102         [TCA_CT_ZONE] = { .type = NLA_U16 },
1103         [TCA_CT_MARK] = { .type = NLA_U32 },
1104         [TCA_CT_MARK_MASK] = { .type = NLA_U32 },
1105         [TCA_CT_LABELS] = { .type = NLA_BINARY,
1106                             .len = 128 / BITS_PER_BYTE },
1107         [TCA_CT_LABELS_MASK] = { .type = NLA_BINARY,
1108                                  .len = 128 / BITS_PER_BYTE },
1109         [TCA_CT_NAT_IPV4_MIN] = { .type = NLA_U32 },
1110         [TCA_CT_NAT_IPV4_MAX] = { .type = NLA_U32 },
1111         [TCA_CT_NAT_IPV6_MIN] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
1112         [TCA_CT_NAT_IPV6_MAX] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
1113         [TCA_CT_NAT_PORT_MIN] = { .type = NLA_U16 },
1114         [TCA_CT_NAT_PORT_MAX] = { .type = NLA_U16 },
1115         [TCA_CT_HELPER_NAME] = { .type = NLA_STRING, .len = NF_CT_HELPER_NAME_LEN },
1116         [TCA_CT_HELPER_FAMILY] = { .type = NLA_U8 },
1117         [TCA_CT_HELPER_PROTO] = { .type = NLA_U8 },
1118 };
1119
1120 static int tcf_ct_fill_params_nat(struct tcf_ct_params *p,
1121                                   struct tc_ct *parm,
1122                                   struct nlattr **tb,
1123                                   struct netlink_ext_ack *extack)
1124 {
1125         struct nf_nat_range2 *range;
1126
1127         if (!(p->ct_action & TCA_CT_ACT_NAT))
1128                 return 0;
1129
1130         if (!IS_ENABLED(CONFIG_NF_NAT)) {
1131                 NL_SET_ERR_MSG_MOD(extack, "Netfilter nat isn't enabled in kernel");
1132                 return -EOPNOTSUPP;
1133         }
1134
1135         if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
1136                 return 0;
1137
1138         if ((p->ct_action & TCA_CT_ACT_NAT_SRC) &&
1139             (p->ct_action & TCA_CT_ACT_NAT_DST)) {
1140                 NL_SET_ERR_MSG_MOD(extack, "dnat and snat can't be enabled at the same time");
1141                 return -EOPNOTSUPP;
1142         }
1143
1144         range = &p->range;
1145         if (tb[TCA_CT_NAT_IPV4_MIN]) {
1146                 struct nlattr *max_attr = tb[TCA_CT_NAT_IPV4_MAX];
1147
1148                 p->ipv4_range = true;
1149                 range->flags |= NF_NAT_RANGE_MAP_IPS;
1150                 range->min_addr.ip =
1151                         nla_get_in_addr(tb[TCA_CT_NAT_IPV4_MIN]);
1152
1153                 range->max_addr.ip = max_attr ?
1154                                      nla_get_in_addr(max_attr) :
1155                                      range->min_addr.ip;
1156         } else if (tb[TCA_CT_NAT_IPV6_MIN]) {
1157                 struct nlattr *max_attr = tb[TCA_CT_NAT_IPV6_MAX];
1158
1159                 p->ipv4_range = false;
1160                 range->flags |= NF_NAT_RANGE_MAP_IPS;
1161                 range->min_addr.in6 =
1162                         nla_get_in6_addr(tb[TCA_CT_NAT_IPV6_MIN]);
1163
1164                 range->max_addr.in6 = max_attr ?
1165                                       nla_get_in6_addr(max_attr) :
1166                                       range->min_addr.in6;
1167         }
1168
1169         if (tb[TCA_CT_NAT_PORT_MIN]) {
1170                 range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1171                 range->min_proto.all = nla_get_be16(tb[TCA_CT_NAT_PORT_MIN]);
1172
1173                 range->max_proto.all = tb[TCA_CT_NAT_PORT_MAX] ?
1174                                        nla_get_be16(tb[TCA_CT_NAT_PORT_MAX]) :
1175                                        range->min_proto.all;
1176         }
1177
1178         return 0;
1179 }
1180
1181 static void tcf_ct_set_key_val(struct nlattr **tb,
1182                                void *val, int val_type,
1183                                void *mask, int mask_type,
1184                                int len)
1185 {
1186         if (!tb[val_type])
1187                 return;
1188         nla_memcpy(val, tb[val_type], len);
1189
1190         if (!mask)
1191                 return;
1192
1193         if (mask_type == TCA_CT_UNSPEC || !tb[mask_type])
1194                 memset(mask, 0xff, len);
1195         else
1196                 nla_memcpy(mask, tb[mask_type], len);
1197 }
1198
1199 static int tcf_ct_fill_params(struct net *net,
1200                               struct tcf_ct_params *p,
1201                               struct tc_ct *parm,
1202                               struct nlattr **tb,
1203                               struct netlink_ext_ack *extack)
1204 {
1205         struct nf_conntrack_zone zone;
1206         int err, family, proto, len;
1207         bool put_labels = false;
1208         struct nf_conn *tmpl;
1209         char *name;
1210
1211         p->zone = NF_CT_DEFAULT_ZONE_ID;
1212
1213         tcf_ct_set_key_val(tb,
1214                            &p->ct_action, TCA_CT_ACTION,
1215                            NULL, TCA_CT_UNSPEC,
1216                            sizeof(p->ct_action));
1217
1218         if (p->ct_action & TCA_CT_ACT_CLEAR)
1219                 return 0;
1220
1221         err = tcf_ct_fill_params_nat(p, parm, tb, extack);
1222         if (err)
1223                 return err;
1224
1225         if (tb[TCA_CT_MARK]) {
1226                 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)) {
1227                         NL_SET_ERR_MSG_MOD(extack, "Conntrack mark isn't enabled.");
1228                         return -EOPNOTSUPP;
1229                 }
1230                 tcf_ct_set_key_val(tb,
1231                                    &p->mark, TCA_CT_MARK,
1232                                    &p->mark_mask, TCA_CT_MARK_MASK,
1233                                    sizeof(p->mark));
1234         }
1235
1236         if (tb[TCA_CT_LABELS]) {
1237                 unsigned int n_bits = sizeof_field(struct tcf_ct_params, labels) * 8;
1238
1239                 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)) {
1240                         NL_SET_ERR_MSG_MOD(extack, "Conntrack labels isn't enabled.");
1241                         return -EOPNOTSUPP;
1242                 }
1243
1244                 if (nf_connlabels_get(net, n_bits - 1)) {
1245                         NL_SET_ERR_MSG_MOD(extack, "Failed to set connlabel length");
1246                         return -EOPNOTSUPP;
1247                 } else {
1248                         put_labels = true;
1249                 }
1250
1251                 tcf_ct_set_key_val(tb,
1252                                    p->labels, TCA_CT_LABELS,
1253                                    p->labels_mask, TCA_CT_LABELS_MASK,
1254                                    sizeof(p->labels));
1255         }
1256
1257         if (tb[TCA_CT_ZONE]) {
1258                 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)) {
1259                         NL_SET_ERR_MSG_MOD(extack, "Conntrack zones isn't enabled.");
1260                         return -EOPNOTSUPP;
1261                 }
1262
1263                 tcf_ct_set_key_val(tb,
1264                                    &p->zone, TCA_CT_ZONE,
1265                                    NULL, TCA_CT_UNSPEC,
1266                                    sizeof(p->zone));
1267         }
1268
1269         nf_ct_zone_init(&zone, p->zone, NF_CT_DEFAULT_ZONE_DIR, 0);
1270         tmpl = nf_ct_tmpl_alloc(net, &zone, GFP_KERNEL);
1271         if (!tmpl) {
1272                 NL_SET_ERR_MSG_MOD(extack, "Failed to allocate conntrack template");
1273                 return -ENOMEM;
1274         }
1275         p->tmpl = tmpl;
1276         if (tb[TCA_CT_HELPER_NAME]) {
1277                 name = nla_data(tb[TCA_CT_HELPER_NAME]);
1278                 len = nla_len(tb[TCA_CT_HELPER_NAME]);
1279                 if (len > 16 || name[len - 1] != '\0') {
1280                         NL_SET_ERR_MSG_MOD(extack, "Failed to parse helper name.");
1281                         err = -EINVAL;
1282                         goto err;
1283                 }
1284                 family = tb[TCA_CT_HELPER_FAMILY] ? nla_get_u8(tb[TCA_CT_HELPER_FAMILY]) : AF_INET;
1285                 proto = tb[TCA_CT_HELPER_PROTO] ? nla_get_u8(tb[TCA_CT_HELPER_PROTO]) : IPPROTO_TCP;
1286                 err = nf_ct_add_helper(tmpl, name, family, proto,
1287                                        p->ct_action & TCA_CT_ACT_NAT, &p->helper);
1288                 if (err) {
1289                         NL_SET_ERR_MSG_MOD(extack, "Failed to add helper");
1290                         goto err;
1291                 }
1292         }
1293
1294         p->put_labels = put_labels;
1295
1296         if (p->ct_action & TCA_CT_ACT_COMMIT)
1297                 __set_bit(IPS_CONFIRMED_BIT, &tmpl->status);
1298         return 0;
1299 err:
1300         if (put_labels)
1301                 nf_connlabels_put(net);
1302
1303         nf_ct_put(p->tmpl);
1304         p->tmpl = NULL;
1305         return err;
1306 }
1307
1308 static int tcf_ct_init(struct net *net, struct nlattr *nla,
1309                        struct nlattr *est, struct tc_action **a,
1310                        struct tcf_proto *tp, u32 flags,
1311                        struct netlink_ext_ack *extack)
1312 {
1313         struct tc_action_net *tn = net_generic(net, act_ct_ops.net_id);
1314         bool bind = flags & TCA_ACT_FLAGS_BIND;
1315         struct tcf_ct_params *params = NULL;
1316         struct nlattr *tb[TCA_CT_MAX + 1];
1317         struct tcf_chain *goto_ch = NULL;
1318         struct tc_ct *parm;
1319         struct tcf_ct *c;
1320         int err, res = 0;
1321         u32 index;
1322
1323         if (!nla) {
1324                 NL_SET_ERR_MSG_MOD(extack, "Ct requires attributes to be passed");
1325                 return -EINVAL;
1326         }
1327
1328         err = nla_parse_nested(tb, TCA_CT_MAX, nla, ct_policy, extack);
1329         if (err < 0)
1330                 return err;
1331
1332         if (!tb[TCA_CT_PARMS]) {
1333                 NL_SET_ERR_MSG_MOD(extack, "Missing required ct parameters");
1334                 return -EINVAL;
1335         }
1336         parm = nla_data(tb[TCA_CT_PARMS]);
1337         index = parm->index;
1338         err = tcf_idr_check_alloc(tn, &index, a, bind);
1339         if (err < 0)
1340                 return err;
1341
1342         if (!err) {
1343                 err = tcf_idr_create_from_flags(tn, index, est, a,
1344                                                 &act_ct_ops, bind, flags);
1345                 if (err) {
1346                         tcf_idr_cleanup(tn, index);
1347                         return err;
1348                 }
1349                 res = ACT_P_CREATED;
1350         } else {
1351                 if (bind)
1352                         return ACT_P_BOUND;
1353
1354                 if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
1355                         tcf_idr_release(*a, bind);
1356                         return -EEXIST;
1357                 }
1358         }
1359         err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
1360         if (err < 0)
1361                 goto cleanup;
1362
1363         c = to_ct(*a);
1364
1365         params = kzalloc(sizeof(*params), GFP_KERNEL);
1366         if (unlikely(!params)) {
1367                 err = -ENOMEM;
1368                 goto cleanup;
1369         }
1370
1371         err = tcf_ct_fill_params(net, params, parm, tb, extack);
1372         if (err)
1373                 goto cleanup;
1374
1375         err = tcf_ct_flow_table_get(net, params);
1376         if (err)
1377                 goto cleanup;
1378
1379         spin_lock_bh(&c->tcf_lock);
1380         goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
1381         params = rcu_replace_pointer(c->params, params,
1382                                      lockdep_is_held(&c->tcf_lock));
1383         spin_unlock_bh(&c->tcf_lock);
1384
1385         if (goto_ch)
1386                 tcf_chain_put_by_act(goto_ch);
1387         if (params)
1388                 call_rcu(&params->rcu, tcf_ct_params_free_rcu);
1389
1390         return res;
1391
1392 cleanup:
1393         if (goto_ch)
1394                 tcf_chain_put_by_act(goto_ch);
1395         if (params)
1396                 tcf_ct_params_free(params);
1397         tcf_idr_release(*a, bind);
1398         return err;
1399 }
1400
1401 static void tcf_ct_cleanup(struct tc_action *a)
1402 {
1403         struct tcf_ct_params *params;
1404         struct tcf_ct *c = to_ct(a);
1405
1406         params = rcu_dereference_protected(c->params, 1);
1407         if (params)
1408                 call_rcu(&params->rcu, tcf_ct_params_free_rcu);
1409 }
1410
1411 static int tcf_ct_dump_key_val(struct sk_buff *skb,
1412                                void *val, int val_type,
1413                                void *mask, int mask_type,
1414                                int len)
1415 {
1416         int err;
1417
1418         if (mask && !memchr_inv(mask, 0, len))
1419                 return 0;
1420
1421         err = nla_put(skb, val_type, len, val);
1422         if (err)
1423                 return err;
1424
1425         if (mask_type != TCA_CT_UNSPEC) {
1426                 err = nla_put(skb, mask_type, len, mask);
1427                 if (err)
1428                         return err;
1429         }
1430
1431         return 0;
1432 }
1433
1434 static int tcf_ct_dump_nat(struct sk_buff *skb, struct tcf_ct_params *p)
1435 {
1436         struct nf_nat_range2 *range = &p->range;
1437
1438         if (!(p->ct_action & TCA_CT_ACT_NAT))
1439                 return 0;
1440
1441         if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
1442                 return 0;
1443
1444         if (range->flags & NF_NAT_RANGE_MAP_IPS) {
1445                 if (p->ipv4_range) {
1446                         if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MIN,
1447                                             range->min_addr.ip))
1448                                 return -1;
1449                         if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MAX,
1450                                             range->max_addr.ip))
1451                                 return -1;
1452                 } else {
1453                         if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MIN,
1454                                              &range->min_addr.in6))
1455                                 return -1;
1456                         if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MAX,
1457                                              &range->max_addr.in6))
1458                                 return -1;
1459                 }
1460         }
1461
1462         if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
1463                 if (nla_put_be16(skb, TCA_CT_NAT_PORT_MIN,
1464                                  range->min_proto.all))
1465                         return -1;
1466                 if (nla_put_be16(skb, TCA_CT_NAT_PORT_MAX,
1467                                  range->max_proto.all))
1468                         return -1;
1469         }
1470
1471         return 0;
1472 }
1473
1474 static int tcf_ct_dump_helper(struct sk_buff *skb, struct nf_conntrack_helper *helper)
1475 {
1476         if (!helper)
1477                 return 0;
1478
1479         if (nla_put_string(skb, TCA_CT_HELPER_NAME, helper->name) ||
1480             nla_put_u8(skb, TCA_CT_HELPER_FAMILY, helper->tuple.src.l3num) ||
1481             nla_put_u8(skb, TCA_CT_HELPER_PROTO, helper->tuple.dst.protonum))
1482                 return -1;
1483
1484         return 0;
1485 }
1486
1487 static inline int tcf_ct_dump(struct sk_buff *skb, struct tc_action *a,
1488                               int bind, int ref)
1489 {
1490         unsigned char *b = skb_tail_pointer(skb);
1491         struct tcf_ct *c = to_ct(a);
1492         struct tcf_ct_params *p;
1493
1494         struct tc_ct opt = {
1495                 .index   = c->tcf_index,
1496                 .refcnt  = refcount_read(&c->tcf_refcnt) - ref,
1497                 .bindcnt = atomic_read(&c->tcf_bindcnt) - bind,
1498         };
1499         struct tcf_t t;
1500
1501         spin_lock_bh(&c->tcf_lock);
1502         p = rcu_dereference_protected(c->params,
1503                                       lockdep_is_held(&c->tcf_lock));
1504         opt.action = c->tcf_action;
1505
1506         if (tcf_ct_dump_key_val(skb,
1507                                 &p->ct_action, TCA_CT_ACTION,
1508                                 NULL, TCA_CT_UNSPEC,
1509                                 sizeof(p->ct_action)))
1510                 goto nla_put_failure;
1511
1512         if (p->ct_action & TCA_CT_ACT_CLEAR)
1513                 goto skip_dump;
1514
1515         if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
1516             tcf_ct_dump_key_val(skb,
1517                                 &p->mark, TCA_CT_MARK,
1518                                 &p->mark_mask, TCA_CT_MARK_MASK,
1519                                 sizeof(p->mark)))
1520                 goto nla_put_failure;
1521
1522         if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1523             tcf_ct_dump_key_val(skb,
1524                                 p->labels, TCA_CT_LABELS,
1525                                 p->labels_mask, TCA_CT_LABELS_MASK,
1526                                 sizeof(p->labels)))
1527                 goto nla_put_failure;
1528
1529         if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1530             tcf_ct_dump_key_val(skb,
1531                                 &p->zone, TCA_CT_ZONE,
1532                                 NULL, TCA_CT_UNSPEC,
1533                                 sizeof(p->zone)))
1534                 goto nla_put_failure;
1535
1536         if (tcf_ct_dump_nat(skb, p))
1537                 goto nla_put_failure;
1538
1539         if (tcf_ct_dump_helper(skb, p->helper))
1540                 goto nla_put_failure;
1541
1542 skip_dump:
1543         if (nla_put(skb, TCA_CT_PARMS, sizeof(opt), &opt))
1544                 goto nla_put_failure;
1545
1546         tcf_tm_dump(&t, &c->tcf_tm);
1547         if (nla_put_64bit(skb, TCA_CT_TM, sizeof(t), &t, TCA_CT_PAD))
1548                 goto nla_put_failure;
1549         spin_unlock_bh(&c->tcf_lock);
1550
1551         return skb->len;
1552 nla_put_failure:
1553         spin_unlock_bh(&c->tcf_lock);
1554         nlmsg_trim(skb, b);
1555         return -1;
1556 }
1557
1558 static void tcf_stats_update(struct tc_action *a, u64 bytes, u64 packets,
1559                              u64 drops, u64 lastuse, bool hw)
1560 {
1561         struct tcf_ct *c = to_ct(a);
1562
1563         tcf_action_update_stats(a, bytes, packets, drops, hw);
1564         c->tcf_tm.lastuse = max_t(u64, c->tcf_tm.lastuse, lastuse);
1565 }
1566
1567 static int tcf_ct_offload_act_setup(struct tc_action *act, void *entry_data,
1568                                     u32 *index_inc, bool bind,
1569                                     struct netlink_ext_ack *extack)
1570 {
1571         if (bind) {
1572                 struct flow_action_entry *entry = entry_data;
1573
1574                 if (tcf_ct_helper(act))
1575                         return -EOPNOTSUPP;
1576
1577                 entry->id = FLOW_ACTION_CT;
1578                 entry->ct.action = tcf_ct_action(act);
1579                 entry->ct.zone = tcf_ct_zone(act);
1580                 entry->ct.flow_table = tcf_ct_ft(act);
1581                 *index_inc = 1;
1582         } else {
1583                 struct flow_offload_action *fl_action = entry_data;
1584
1585                 fl_action->id = FLOW_ACTION_CT;
1586         }
1587
1588         return 0;
1589 }
1590
1591 static struct tc_action_ops act_ct_ops = {
1592         .kind           =       "ct",
1593         .id             =       TCA_ID_CT,
1594         .owner          =       THIS_MODULE,
1595         .act            =       tcf_ct_act,
1596         .dump           =       tcf_ct_dump,
1597         .init           =       tcf_ct_init,
1598         .cleanup        =       tcf_ct_cleanup,
1599         .stats_update   =       tcf_stats_update,
1600         .offload_act_setup =    tcf_ct_offload_act_setup,
1601         .size           =       sizeof(struct tcf_ct),
1602 };
1603
1604 static __net_init int ct_init_net(struct net *net)
1605 {
1606         struct tc_ct_action_net *tn = net_generic(net, act_ct_ops.net_id);
1607
1608         return tc_action_net_init(net, &tn->tn, &act_ct_ops);
1609 }
1610
1611 static void __net_exit ct_exit_net(struct list_head *net_list)
1612 {
1613         tc_action_net_exit(net_list, act_ct_ops.net_id);
1614 }
1615
1616 static struct pernet_operations ct_net_ops = {
1617         .init = ct_init_net,
1618         .exit_batch = ct_exit_net,
1619         .id   = &act_ct_ops.net_id,
1620         .size = sizeof(struct tc_ct_action_net),
1621 };
1622
1623 static int __init ct_init_module(void)
1624 {
1625         int err;
1626
1627         act_ct_wq = alloc_ordered_workqueue("act_ct_workqueue", 0);
1628         if (!act_ct_wq)
1629                 return -ENOMEM;
1630
1631         err = tcf_ct_flow_tables_init();
1632         if (err)
1633                 goto err_tbl_init;
1634
1635         err = tcf_register_action(&act_ct_ops, &ct_net_ops);
1636         if (err)
1637                 goto err_register;
1638
1639         static_branch_inc(&tcf_frag_xmit_count);
1640
1641         return 0;
1642
1643 err_register:
1644         tcf_ct_flow_tables_uninit();
1645 err_tbl_init:
1646         destroy_workqueue(act_ct_wq);
1647         return err;
1648 }
1649
1650 static void __exit ct_cleanup_module(void)
1651 {
1652         static_branch_dec(&tcf_frag_xmit_count);
1653         tcf_unregister_action(&act_ct_ops, &ct_net_ops);
1654         tcf_ct_flow_tables_uninit();
1655         destroy_workqueue(act_ct_wq);
1656 }
1657
1658 module_init(ct_init_module);
1659 module_exit(ct_cleanup_module);
1660 MODULE_AUTHOR("Paul Blakey <paulb@mellanox.com>");
1661 MODULE_AUTHOR("Yossi Kuperman <yossiku@mellanox.com>");
1662 MODULE_AUTHOR("Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>");
1663 MODULE_DESCRIPTION("Connection tracking action");
1664 MODULE_LICENSE("GPL v2");