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 28#include <net/netfilter/nf_flow_table.h> 29#include <net/netfilter/nf_conntrack.h> 30#include <net/netfilter/nf_conntrack_core.h> 31#include <net/netfilter/nf_conntrack_zones.h> 32#include <net/netfilter/nf_conntrack_helper.h> 33#include <net/netfilter/nf_conntrack_acct.h> 34#include <net/netfilter/ipv6/nf_defrag_ipv6.h> 35#include <uapi/linux/netfilter/nf_nat.h> 36 37static struct workqueue_struct *act_ct_wq; 38static struct rhashtable zones_ht; 39static DEFINE_MUTEX(zones_mutex); 40 41struct tcf_ct_flow_table { 42 struct rhash_head node; /* In zones tables */ 43 44 struct rcu_work rwork; 45 struct nf_flowtable nf_ft; 46 refcount_t ref; 47 u16 zone; 48 49 bool dying; 50}; 51 52static const struct rhashtable_params zones_params = { 53 .head_offset = offsetof(struct tcf_ct_flow_table, node), 54 .key_offset = offsetof(struct tcf_ct_flow_table, zone), 55 .key_len = sizeof_field(struct tcf_ct_flow_table, zone), 56 .automatic_shrinking = true, 57}; 58 59static struct flow_action_entry * 60tcf_ct_flow_table_flow_action_get_next(struct flow_action *flow_action) 61{ 62 int i = flow_action->num_entries++; 63 64 return &flow_action->entries[i]; 65} 66 67static void tcf_ct_add_mangle_action(struct flow_action *action, 68 enum flow_action_mangle_base htype, 69 u32 offset, 70 u32 mask, 71 u32 val) 72{ 73 struct flow_action_entry *entry; 74 75 entry = tcf_ct_flow_table_flow_action_get_next(action); 76 entry->id = FLOW_ACTION_MANGLE; 77 entry->mangle.htype = htype; 78 entry->mangle.mask = ~mask; 79 entry->mangle.offset = offset; 80 entry->mangle.val = val; 81} 82 83/* The following nat helper functions check if the inverted reverse tuple 84 * (target) is different then the current dir tuple - meaning nat for ports 85 * and/or ip is needed, and add the relevant mangle actions. 86 */ 87static void 88tcf_ct_flow_table_add_action_nat_ipv4(const struct nf_conntrack_tuple *tuple, 89 struct nf_conntrack_tuple target, 90 struct flow_action *action) 91{ 92 if (memcmp(&target.src.u3, &tuple->src.u3, sizeof(target.src.u3))) 93 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP4, 94 offsetof(struct iphdr, saddr), 95 0xFFFFFFFF, 96 be32_to_cpu(target.src.u3.ip)); 97 if (memcmp(&target.dst.u3, &tuple->dst.u3, sizeof(target.dst.u3))) 98 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP4, 99 offsetof(struct iphdr, daddr), 100 0xFFFFFFFF, 101 be32_to_cpu(target.dst.u3.ip)); 102} 103 104static void 105tcf_ct_add_ipv6_addr_mangle_action(struct flow_action *action, 106 union nf_inet_addr *addr, 107 u32 offset) 108{ 109 int i; 110 111 for (i = 0; i < sizeof(struct in6_addr) / sizeof(u32); i++) 112 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP6, 113 i * sizeof(u32) + offset, 114 0xFFFFFFFF, be32_to_cpu(addr->ip6[i])); 115} 116 117static void 118tcf_ct_flow_table_add_action_nat_ipv6(const struct nf_conntrack_tuple *tuple, 119 struct nf_conntrack_tuple target, 120 struct flow_action *action) 121{ 122 if (memcmp(&target.src.u3, &tuple->src.u3, sizeof(target.src.u3))) 123 tcf_ct_add_ipv6_addr_mangle_action(action, &target.src.u3, 124 offsetof(struct ipv6hdr, 125 saddr)); 126 if (memcmp(&target.dst.u3, &tuple->dst.u3, sizeof(target.dst.u3))) 127 tcf_ct_add_ipv6_addr_mangle_action(action, &target.dst.u3, 128 offsetof(struct ipv6hdr, 129 daddr)); 130} 131 132static void 133tcf_ct_flow_table_add_action_nat_tcp(const struct nf_conntrack_tuple *tuple, 134 struct nf_conntrack_tuple target, 135 struct flow_action *action) 136{ 137 __be16 target_src = target.src.u.tcp.port; 138 __be16 target_dst = target.dst.u.tcp.port; 139 140 if (target_src != tuple->src.u.tcp.port) 141 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP, 142 offsetof(struct tcphdr, source), 143 0xFFFF, be16_to_cpu(target_src)); 144 if (target_dst != tuple->dst.u.tcp.port) 145 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP, 146 offsetof(struct tcphdr, dest), 147 0xFFFF, be16_to_cpu(target_dst)); 148} 149 150static void 151tcf_ct_flow_table_add_action_nat_udp(const struct nf_conntrack_tuple *tuple, 152 struct nf_conntrack_tuple target, 153 struct flow_action *action) 154{ 155 __be16 target_src = target.src.u.udp.port; 156 __be16 target_dst = target.dst.u.udp.port; 157 158 if (target_src != tuple->src.u.udp.port) 159 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_UDP, 160 offsetof(struct udphdr, source), 161 0xFFFF, be16_to_cpu(target_src)); 162 if (target_dst != tuple->dst.u.udp.port) 163 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_UDP, 164 offsetof(struct udphdr, dest), 165 0xFFFF, be16_to_cpu(target_dst)); 166} 167 168static void tcf_ct_flow_table_add_action_meta(struct nf_conn *ct, 169 enum ip_conntrack_dir dir, 170 struct flow_action *action) 171{ 172 struct nf_conn_labels *ct_labels; 173 struct flow_action_entry *entry; 174 enum ip_conntrack_info ctinfo; 175 u32 *act_ct_labels; 176 177 entry = tcf_ct_flow_table_flow_action_get_next(action); 178 entry->id = FLOW_ACTION_CT_METADATA; 179#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) 180 entry->ct_metadata.mark = READ_ONCE(ct->mark); 181#endif 182 ctinfo = dir == IP_CT_DIR_ORIGINAL ? IP_CT_ESTABLISHED : 183 IP_CT_ESTABLISHED_REPLY; 184 /* aligns with the CT reference on the SKB nf_ct_set */ 185 entry->ct_metadata.cookie = (unsigned long)ct | ctinfo; 186 187 act_ct_labels = entry->ct_metadata.labels; 188 ct_labels = nf_ct_labels_find(ct); 189 if (ct_labels) 190 memcpy(act_ct_labels, ct_labels->bits, NF_CT_LABELS_MAX_SIZE); 191 else 192 memset(act_ct_labels, 0, NF_CT_LABELS_MAX_SIZE); 193} 194 195static int tcf_ct_flow_table_add_action_nat(struct net *net, 196 struct nf_conn *ct, 197 enum ip_conntrack_dir dir, 198 struct flow_action *action) 199{ 200 const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple; 201 struct nf_conntrack_tuple target; 202 203 if (!(ct->status & IPS_NAT_MASK)) 204 return 0; 205 206 nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple); 207 208 switch (tuple->src.l3num) { 209 case NFPROTO_IPV4: 210 tcf_ct_flow_table_add_action_nat_ipv4(tuple, target, 211 action); 212 break; 213 case NFPROTO_IPV6: 214 tcf_ct_flow_table_add_action_nat_ipv6(tuple, target, 215 action); 216 break; 217 default: 218 return -EOPNOTSUPP; 219 } 220 221 switch (nf_ct_protonum(ct)) { 222 case IPPROTO_TCP: 223 tcf_ct_flow_table_add_action_nat_tcp(tuple, target, action); 224 break; 225 case IPPROTO_UDP: 226 tcf_ct_flow_table_add_action_nat_udp(tuple, target, action); 227 break; 228 default: 229 return -EOPNOTSUPP; 230 } 231 232 return 0; 233} 234 235static int tcf_ct_flow_table_fill_actions(struct net *net, 236 const struct flow_offload *flow, 237 enum flow_offload_tuple_dir tdir, 238 struct nf_flow_rule *flow_rule) 239{ 240 struct flow_action *action = &flow_rule->rule->action; 241 int num_entries = action->num_entries; 242 struct nf_conn *ct = flow->ct; 243 enum ip_conntrack_dir dir; 244 int i, err; 245 246 switch (tdir) { 247 case FLOW_OFFLOAD_DIR_ORIGINAL: 248 dir = IP_CT_DIR_ORIGINAL; 249 break; 250 case FLOW_OFFLOAD_DIR_REPLY: 251 dir = IP_CT_DIR_REPLY; 252 break; 253 default: 254 return -EOPNOTSUPP; 255 } 256 257 err = tcf_ct_flow_table_add_action_nat(net, ct, dir, action); 258 if (err) 259 goto err_nat; 260 261 tcf_ct_flow_table_add_action_meta(ct, dir, action); 262 return 0; 263 264err_nat: 265 /* Clear filled actions */ 266 for (i = num_entries; i < action->num_entries; i++) 267 memset(&action->entries[i], 0, sizeof(action->entries[i])); 268 action->num_entries = num_entries; 269 270 return err; 271} 272 273static struct nf_flowtable_type flowtable_ct = { 274 .action = tcf_ct_flow_table_fill_actions, 275 .owner = THIS_MODULE, 276}; 277 278static int tcf_ct_flow_table_get(struct tcf_ct_params *params) 279{ 280 struct tcf_ct_flow_table *ct_ft; 281 int err = -ENOMEM; 282 283 mutex_lock(&zones_mutex); 284 ct_ft = rhashtable_lookup_fast(&zones_ht, ¶ms->zone, zones_params); 285 if (ct_ft && refcount_inc_not_zero(&ct_ft->ref)) 286 goto out_unlock; 287 288 ct_ft = kzalloc(sizeof(*ct_ft), GFP_KERNEL); 289 if (!ct_ft) 290 goto err_alloc; 291 refcount_set(&ct_ft->ref, 1); 292 293 ct_ft->zone = params->zone; 294 err = rhashtable_insert_fast(&zones_ht, &ct_ft->node, zones_params); 295 if (err) 296 goto err_insert; 297 298 ct_ft->nf_ft.type = &flowtable_ct; 299 ct_ft->nf_ft.flags |= NF_FLOWTABLE_HW_OFFLOAD; 300 err = nf_flow_table_init(&ct_ft->nf_ft); 301 if (err) 302 goto err_init; 303 304 __module_get(THIS_MODULE); 305out_unlock: 306 params->ct_ft = ct_ft; 307 params->nf_ft = &ct_ft->nf_ft; 308 mutex_unlock(&zones_mutex); 309 310 return 0; 311 312err_init: 313 rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params); 314err_insert: 315 kfree(ct_ft); 316err_alloc: 317 mutex_unlock(&zones_mutex); 318 return err; 319} 320 321static void tcf_ct_flow_table_cleanup_work(struct work_struct *work) 322{ 323 struct flow_block_cb *block_cb, *tmp_cb; 324 struct tcf_ct_flow_table *ct_ft; 325 struct flow_block *block; 326 327 ct_ft = container_of(to_rcu_work(work), struct tcf_ct_flow_table, 328 rwork); 329 nf_flow_table_free(&ct_ft->nf_ft); 330 331 /* Remove any remaining callbacks before cleanup */ 332 block = &ct_ft->nf_ft.flow_block; 333 down_write(&ct_ft->nf_ft.flow_block_lock); 334 list_for_each_entry_safe(block_cb, tmp_cb, &block->cb_list, list) { 335 list_del(&block_cb->list); 336 flow_block_cb_free(block_cb); 337 } 338 up_write(&ct_ft->nf_ft.flow_block_lock); 339 kfree(ct_ft); 340 341 module_put(THIS_MODULE); 342} 343 344static void tcf_ct_flow_table_put(struct tcf_ct_params *params) 345{ 346 struct tcf_ct_flow_table *ct_ft = params->ct_ft; 347 348 if (refcount_dec_and_test(¶ms->ct_ft->ref)) { 349 rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params); 350 INIT_RCU_WORK(&ct_ft->rwork, tcf_ct_flow_table_cleanup_work); 351 queue_rcu_work(act_ct_wq, &ct_ft->rwork); 352 } 353} 354 355static void tcf_ct_flow_table_add(struct tcf_ct_flow_table *ct_ft, 356 struct nf_conn *ct, 357 bool tcp) 358{ 359 struct flow_offload *entry; 360 int err; 361 362 if (test_and_set_bit(IPS_OFFLOAD_BIT, &ct->status)) 363 return; 364 365 entry = flow_offload_alloc(ct); 366 if (!entry) { 367 WARN_ON_ONCE(1); 368 goto err_alloc; 369 } 370 371 if (tcp) { 372 ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL; 373 ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL; 374 } 375 376 err = flow_offload_add(&ct_ft->nf_ft, entry); 377 if (err) 378 goto err_add; 379 380 return; 381 382err_add: 383 flow_offload_free(entry); 384err_alloc: 385 clear_bit(IPS_OFFLOAD_BIT, &ct->status); 386} 387 388static void tcf_ct_flow_table_process_conn(struct tcf_ct_flow_table *ct_ft, 389 struct nf_conn *ct, 390 enum ip_conntrack_info ctinfo) 391{ 392 bool tcp = false; 393 394 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) 395 return; 396 397 switch (nf_ct_protonum(ct)) { 398 case IPPROTO_TCP: 399 tcp = true; 400 if (ct->proto.tcp.state != TCP_CONNTRACK_ESTABLISHED) 401 return; 402 break; 403 case IPPROTO_UDP: 404 break; 405 default: 406 return; 407 } 408 409 if (nf_ct_ext_exist(ct, NF_CT_EXT_HELPER) || 410 ct->status & IPS_SEQ_ADJUST) 411 return; 412 413 tcf_ct_flow_table_add(ct_ft, ct, tcp); 414} 415 416static bool 417tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb, 418 struct flow_offload_tuple *tuple, 419 struct tcphdr **tcph) 420{ 421 struct flow_ports *ports; 422 unsigned int thoff; 423 struct iphdr *iph; 424 425 if (!pskb_network_may_pull(skb, sizeof(*iph))) 426 return false; 427 428 iph = ip_hdr(skb); 429 thoff = iph->ihl * 4; 430 431 if (ip_is_fragment(iph) || 432 unlikely(thoff != sizeof(struct iphdr))) 433 return false; 434 435 if (iph->protocol != IPPROTO_TCP && 436 iph->protocol != IPPROTO_UDP) 437 return false; 438 439 if (iph->ttl <= 1) 440 return false; 441 442 if (!pskb_network_may_pull(skb, iph->protocol == IPPROTO_TCP ? 443 thoff + sizeof(struct tcphdr) : 444 thoff + sizeof(*ports))) 445 return false; 446 447 iph = ip_hdr(skb); 448 if (iph->protocol == IPPROTO_TCP) 449 *tcph = (void *)(skb_network_header(skb) + thoff); 450 451 ports = (struct flow_ports *)(skb_network_header(skb) + thoff); 452 tuple->src_v4.s_addr = iph->saddr; 453 tuple->dst_v4.s_addr = iph->daddr; 454 tuple->src_port = ports->source; 455 tuple->dst_port = ports->dest; 456 tuple->l3proto = AF_INET; 457 tuple->l4proto = iph->protocol; 458 459 return true; 460} 461 462static bool 463tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff *skb, 464 struct flow_offload_tuple *tuple, 465 struct tcphdr **tcph) 466{ 467 struct flow_ports *ports; 468 struct ipv6hdr *ip6h; 469 unsigned int thoff; 470 471 if (!pskb_network_may_pull(skb, sizeof(*ip6h))) 472 return false; 473 474 ip6h = ipv6_hdr(skb); 475 476 if (ip6h->nexthdr != IPPROTO_TCP && 477 ip6h->nexthdr != IPPROTO_UDP) 478 return false; 479 480 if (ip6h->hop_limit <= 1) 481 return false; 482 483 thoff = sizeof(*ip6h); 484 if (!pskb_network_may_pull(skb, ip6h->nexthdr == IPPROTO_TCP ? 485 thoff + sizeof(struct tcphdr) : 486 thoff + sizeof(*ports))) 487 return false; 488 489 ip6h = ipv6_hdr(skb); 490 if (ip6h->nexthdr == IPPROTO_TCP) 491 *tcph = (void *)(skb_network_header(skb) + thoff); 492 493 ports = (struct flow_ports *)(skb_network_header(skb) + thoff); 494 tuple->src_v6 = ip6h->saddr; 495 tuple->dst_v6 = ip6h->daddr; 496 tuple->src_port = ports->source; 497 tuple->dst_port = ports->dest; 498 tuple->l3proto = AF_INET6; 499 tuple->l4proto = ip6h->nexthdr; 500 501 return true; 502} 503 504static bool tcf_ct_flow_table_lookup(struct tcf_ct_params *p, 505 struct sk_buff *skb, 506 u8 family) 507{ 508 struct nf_flowtable *nf_ft = &p->ct_ft->nf_ft; 509 struct flow_offload_tuple_rhash *tuplehash; 510 struct flow_offload_tuple tuple = {}; 511 enum ip_conntrack_info ctinfo; 512 struct tcphdr *tcph = NULL; 513 struct flow_offload *flow; 514 struct nf_conn *ct; 515 u8 dir; 516 517 switch (family) { 518 case NFPROTO_IPV4: 519 if (!tcf_ct_flow_table_fill_tuple_ipv4(skb, &tuple, &tcph)) 520 return false; 521 break; 522 case NFPROTO_IPV6: 523 if (!tcf_ct_flow_table_fill_tuple_ipv6(skb, &tuple, &tcph)) 524 return false; 525 break; 526 default: 527 return false; 528 } 529 530 tuplehash = flow_offload_lookup(nf_ft, &tuple); 531 if (!tuplehash) 532 return false; 533 534 dir = tuplehash->tuple.dir; 535 flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]); 536 ct = flow->ct; 537 538 if (tcph && (unlikely(tcph->fin || tcph->rst))) { 539 flow_offload_teardown(flow); 540 return false; 541 } 542 543 ctinfo = dir == FLOW_OFFLOAD_DIR_ORIGINAL ? IP_CT_ESTABLISHED : 544 IP_CT_ESTABLISHED_REPLY; 545 546 flow_offload_refresh(nf_ft, flow); 547 nf_conntrack_get(&ct->ct_general); 548 nf_ct_set(skb, ct, ctinfo); 549 nf_ct_acct_update(ct, dir, skb->len); 550 551 return true; 552} 553 554static int tcf_ct_flow_tables_init(void) 555{ 556 return rhashtable_init(&zones_ht, &zones_params); 557} 558 559static void tcf_ct_flow_tables_uninit(void) 560{ 561 rhashtable_destroy(&zones_ht); 562} 563 564static struct tc_action_ops act_ct_ops; 565static unsigned int ct_net_id; 566 567struct tc_ct_action_net { 568 struct tc_action_net tn; /* Must be first */ 569 bool labels; 570}; 571 572/* Determine whether skb->_nfct is equal to the result of conntrack lookup. */ 573static bool tcf_ct_skb_nfct_cached(struct net *net, struct sk_buff *skb, 574 u16 zone_id, bool force) 575{ 576 enum ip_conntrack_info ctinfo; 577 struct nf_conn *ct; 578 579 ct = nf_ct_get(skb, &ctinfo); 580 if (!ct) 581 return false; 582 if (!net_eq(net, read_pnet(&ct->ct_net))) 583 return false; 584 if (nf_ct_zone(ct)->id != zone_id) 585 return false; 586 587 /* Force conntrack entry direction. */ 588 if (force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) { 589 if (nf_ct_is_confirmed(ct)) 590 nf_ct_kill(ct); 591 592 nf_conntrack_put(&ct->ct_general); 593 nf_ct_set(skb, NULL, IP_CT_UNTRACKED); 594 595 return false; 596 } 597 598 return true; 599} 600 601/* Trim the skb to the length specified by the IP/IPv6 header, 602 * removing any trailing lower-layer padding. This prepares the skb 603 * for higher-layer processing that assumes skb->len excludes padding 604 * (such as nf_ip_checksum). The caller needs to pull the skb to the 605 * network header, and ensure ip_hdr/ipv6_hdr points to valid data. 606 */ 607static int tcf_ct_skb_network_trim(struct sk_buff *skb, int family) 608{ 609 unsigned int len; 610 int err; 611 612 switch (family) { 613 case NFPROTO_IPV4: 614 len = ntohs(ip_hdr(skb)->tot_len); 615 break; 616 case NFPROTO_IPV6: 617 len = sizeof(struct ipv6hdr) 618 + ntohs(ipv6_hdr(skb)->payload_len); 619 break; 620 default: 621 len = skb->len; 622 } 623 624 err = pskb_trim_rcsum(skb, len); 625 626 return err; 627} 628 629static u8 tcf_ct_skb_nf_family(struct sk_buff *skb) 630{ 631 u8 family = NFPROTO_UNSPEC; 632 633 switch (skb_protocol(skb, true)) { 634 case htons(ETH_P_IP): 635 family = NFPROTO_IPV4; 636 break; 637 case htons(ETH_P_IPV6): 638 family = NFPROTO_IPV6; 639 break; 640 default: 641 break; 642 } 643 644 return family; 645} 646 647static int tcf_ct_ipv4_is_fragment(struct sk_buff *skb, bool *frag) 648{ 649 unsigned int len; 650 651 len = skb_network_offset(skb) + sizeof(struct iphdr); 652 if (unlikely(skb->len < len)) 653 return -EINVAL; 654 if (unlikely(!pskb_may_pull(skb, len))) 655 return -ENOMEM; 656 657 *frag = ip_is_fragment(ip_hdr(skb)); 658 return 0; 659} 660 661static int tcf_ct_ipv6_is_fragment(struct sk_buff *skb, bool *frag) 662{ 663 unsigned int flags = 0, len, payload_ofs = 0; 664 unsigned short frag_off; 665 int nexthdr; 666 667 len = skb_network_offset(skb) + sizeof(struct ipv6hdr); 668 if (unlikely(skb->len < len)) 669 return -EINVAL; 670 if (unlikely(!pskb_may_pull(skb, len))) 671 return -ENOMEM; 672 673 nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags); 674 if (unlikely(nexthdr < 0)) 675 return -EPROTO; 676 677 *frag = flags & IP6_FH_F_FRAG; 678 return 0; 679} 680 681static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb, 682 u8 family, u16 zone, bool *defrag) 683{ 684 enum ip_conntrack_info ctinfo; 685 struct qdisc_skb_cb cb; 686 struct nf_conn *ct; 687 int err = 0; 688 bool frag; 689 690 /* Previously seen (loopback)? Ignore. */ 691 ct = nf_ct_get(skb, &ctinfo); 692 if ((ct && !nf_ct_is_template(ct)) || ctinfo == IP_CT_UNTRACKED) 693 return 0; 694 695 if (family == NFPROTO_IPV4) 696 err = tcf_ct_ipv4_is_fragment(skb, &frag); 697 else 698 err = tcf_ct_ipv6_is_fragment(skb, &frag); 699 if (err || !frag) 700 return err; 701 702 skb_get(skb); 703 cb = *qdisc_skb_cb(skb); 704 705 if (family == NFPROTO_IPV4) { 706 enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone; 707 708 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); 709 local_bh_disable(); 710 err = ip_defrag(net, skb, user); 711 local_bh_enable(); 712 if (err && err != -EINPROGRESS) 713 return err; 714 715 if (!err) { 716 *defrag = true; 717 cb.mru = IPCB(skb)->frag_max_size; 718 } 719 } else { /* NFPROTO_IPV6 */ 720#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) 721 enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone; 722 723 memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); 724 err = nf_ct_frag6_gather(net, skb, user); 725 if (err && err != -EINPROGRESS) 726 goto out_free; 727 728 if (!err) { 729 *defrag = true; 730 cb.mru = IP6CB(skb)->frag_max_size; 731 } 732#else 733 err = -EOPNOTSUPP; 734 goto out_free; 735#endif 736 } 737 738 *qdisc_skb_cb(skb) = cb; 739 skb_clear_hash(skb); 740 skb->ignore_df = 1; 741 return err; 742 743out_free: 744 kfree_skb(skb); 745 return err; 746} 747 748static void tcf_ct_params_free(struct rcu_head *head) 749{ 750 struct tcf_ct_params *params = container_of(head, 751 struct tcf_ct_params, rcu); 752 753 tcf_ct_flow_table_put(params); 754 755 if (params->tmpl) 756 nf_conntrack_put(¶ms->tmpl->ct_general); 757 kfree(params); 758} 759 760#if IS_ENABLED(CONFIG_NF_NAT) 761/* Modelled after nf_nat_ipv[46]_fn(). 762 * range is only used for new, uninitialized NAT state. 763 * Returns either NF_ACCEPT or NF_DROP. 764 */ 765static int ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct, 766 enum ip_conntrack_info ctinfo, 767 const struct nf_nat_range2 *range, 768 enum nf_nat_manip_type maniptype) 769{ 770 __be16 proto = skb_protocol(skb, true); 771 int hooknum, err = NF_ACCEPT; 772 773 /* See HOOK2MANIP(). */ 774 if (maniptype == NF_NAT_MANIP_SRC) 775 hooknum = NF_INET_LOCAL_IN; /* Source NAT */ 776 else 777 hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */ 778 779 switch (ctinfo) { 780 case IP_CT_RELATED: 781 case IP_CT_RELATED_REPLY: 782 if (proto == htons(ETH_P_IP) && 783 ip_hdr(skb)->protocol == IPPROTO_ICMP) { 784 if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo, 785 hooknum)) 786 err = NF_DROP; 787 goto out; 788 } else if (IS_ENABLED(CONFIG_IPV6) && proto == htons(ETH_P_IPV6)) { 789 __be16 frag_off; 790 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 791 int hdrlen = ipv6_skip_exthdr(skb, 792 sizeof(struct ipv6hdr), 793 &nexthdr, &frag_off); 794 795 if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) { 796 if (!nf_nat_icmpv6_reply_translation(skb, ct, 797 ctinfo, 798 hooknum, 799 hdrlen)) 800 err = NF_DROP; 801 goto out; 802 } 803 } 804 /* Non-ICMP, fall thru to initialize if needed. */ 805 fallthrough; 806 case IP_CT_NEW: 807 /* Seen it before? This can happen for loopback, retrans, 808 * or local packets. 809 */ 810 if (!nf_nat_initialized(ct, maniptype)) { 811 /* Initialize according to the NAT action. */ 812 err = (range && range->flags & NF_NAT_RANGE_MAP_IPS) 813 /* Action is set up to establish a new 814 * mapping. 815 */ 816 ? nf_nat_setup_info(ct, range, maniptype) 817 : nf_nat_alloc_null_binding(ct, hooknum); 818 if (err != NF_ACCEPT) 819 goto out; 820 } 821 break; 822 823 case IP_CT_ESTABLISHED: 824 case IP_CT_ESTABLISHED_REPLY: 825 break; 826 827 default: 828 err = NF_DROP; 829 goto out; 830 } 831 832 err = nf_nat_packet(ct, ctinfo, hooknum, skb); 833out: 834 return err; 835} 836#endif /* CONFIG_NF_NAT */ 837 838static void tcf_ct_act_set_mark(struct nf_conn *ct, u32 mark, u32 mask) 839{ 840#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) 841 u32 new_mark; 842 843 if (!mask) 844 return; 845 846 new_mark = mark | (READ_ONCE(ct->mark) & ~(mask)); 847 if (READ_ONCE(ct->mark) != new_mark) { 848 WRITE_ONCE(ct->mark, new_mark); 849 if (nf_ct_is_confirmed(ct)) 850 nf_conntrack_event_cache(IPCT_MARK, ct); 851 } 852#endif 853} 854 855static void tcf_ct_act_set_labels(struct nf_conn *ct, 856 u32 *labels, 857 u32 *labels_m) 858{ 859#if IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) 860 size_t labels_sz = sizeof_field(struct tcf_ct_params, labels); 861 862 if (!memchr_inv(labels_m, 0, labels_sz)) 863 return; 864 865 nf_connlabels_replace(ct, labels, labels_m, 4); 866#endif 867} 868 869static int tcf_ct_act_nat(struct sk_buff *skb, 870 struct nf_conn *ct, 871 enum ip_conntrack_info ctinfo, 872 int ct_action, 873 struct nf_nat_range2 *range, 874 bool commit) 875{ 876#if IS_ENABLED(CONFIG_NF_NAT) 877 int err; 878 enum nf_nat_manip_type maniptype; 879 880 if (!(ct_action & TCA_CT_ACT_NAT)) 881 return NF_ACCEPT; 882 883 /* Add NAT extension if not confirmed yet. */ 884 if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct)) 885 return NF_DROP; /* Can't NAT. */ 886 887 if (ctinfo != IP_CT_NEW && (ct->status & IPS_NAT_MASK) && 888 (ctinfo != IP_CT_RELATED || commit)) { 889 /* NAT an established or related connection like before. */ 890 if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) 891 /* This is the REPLY direction for a connection 892 * for which NAT was applied in the forward 893 * direction. Do the reverse NAT. 894 */ 895 maniptype = ct->status & IPS_SRC_NAT 896 ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC; 897 else 898 maniptype = ct->status & IPS_SRC_NAT 899 ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST; 900 } else if (ct_action & TCA_CT_ACT_NAT_SRC) { 901 maniptype = NF_NAT_MANIP_SRC; 902 } else if (ct_action & TCA_CT_ACT_NAT_DST) { 903 maniptype = NF_NAT_MANIP_DST; 904 } else { 905 return NF_ACCEPT; 906 } 907 908 err = ct_nat_execute(skb, ct, ctinfo, range, maniptype); 909 if (err == NF_ACCEPT && ct->status & IPS_DST_NAT) { 910 if (ct->status & IPS_SRC_NAT) { 911 if (maniptype == NF_NAT_MANIP_SRC) 912 maniptype = NF_NAT_MANIP_DST; 913 else 914 maniptype = NF_NAT_MANIP_SRC; 915 916 err = ct_nat_execute(skb, ct, ctinfo, range, 917 maniptype); 918 } else if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) { 919 err = ct_nat_execute(skb, ct, ctinfo, NULL, 920 NF_NAT_MANIP_SRC); 921 } 922 } 923 return err; 924#else 925 return NF_ACCEPT; 926#endif 927} 928 929static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a, 930 struct tcf_result *res) 931{ 932 struct net *net = dev_net(skb->dev); 933 bool cached, commit, clear, force; 934 enum ip_conntrack_info ctinfo; 935 struct tcf_ct *c = to_ct(a); 936 struct nf_conn *tmpl = NULL; 937 struct nf_hook_state state; 938 int nh_ofs, err, retval; 939 struct tcf_ct_params *p; 940 bool skip_add = false; 941 bool defrag = false; 942 struct nf_conn *ct; 943 u8 family; 944 945 p = rcu_dereference_bh(c->params); 946 947 retval = READ_ONCE(c->tcf_action); 948 commit = p->ct_action & TCA_CT_ACT_COMMIT; 949 clear = p->ct_action & TCA_CT_ACT_CLEAR; 950 force = p->ct_action & TCA_CT_ACT_FORCE; 951 tmpl = p->tmpl; 952 953 tcf_lastuse_update(&c->tcf_tm); 954 955 if (clear) { 956 ct = nf_ct_get(skb, &ctinfo); 957 if (ct) { 958 nf_conntrack_put(&ct->ct_general); 959 nf_ct_set(skb, NULL, IP_CT_UNTRACKED); 960 } 961 962 goto out; 963 } 964 965 family = tcf_ct_skb_nf_family(skb); 966 if (family == NFPROTO_UNSPEC) 967 goto drop; 968 969 /* The conntrack module expects to be working at L3. 970 * We also try to pull the IPv4/6 header to linear area 971 */ 972 nh_ofs = skb_network_offset(skb); 973 skb_pull_rcsum(skb, nh_ofs); 974 err = tcf_ct_handle_fragments(net, skb, family, p->zone, &defrag); 975 if (err == -EINPROGRESS) { 976 retval = TC_ACT_STOLEN; 977 goto out; 978 } 979 if (err) 980 goto drop; 981 982 err = tcf_ct_skb_network_trim(skb, family); 983 if (err) 984 goto drop; 985 986 /* If we are recirculating packets to match on ct fields and 987 * committing with a separate ct action, then we don't need to 988 * actually run the packet through conntrack twice unless it's for a 989 * different zone. 990 */ 991 cached = tcf_ct_skb_nfct_cached(net, skb, p->zone, force); 992 if (!cached) { 993 if (tcf_ct_flow_table_lookup(p, skb, family)) { 994 skip_add = true; 995 goto do_nat; 996 } 997 998 /* Associate skb with specified zone. */ 999 if (tmpl) { 1000 ct = nf_ct_get(skb, &ctinfo); 1001 if (skb_nfct(skb)) 1002 nf_conntrack_put(skb_nfct(skb)); 1003 nf_conntrack_get(&tmpl->ct_general); 1004 nf_ct_set(skb, tmpl, IP_CT_NEW); 1005 } 1006 1007 state.hook = NF_INET_PRE_ROUTING; 1008 state.net = net; 1009 state.pf = family; 1010 err = nf_conntrack_in(skb, &state); 1011 if (err != NF_ACCEPT) 1012 goto out_push; 1013 } 1014 1015do_nat: 1016 ct = nf_ct_get(skb, &ctinfo); 1017 if (!ct) 1018 goto out_push; 1019 nf_ct_deliver_cached_events(ct); 1020 1021 err = tcf_ct_act_nat(skb, ct, ctinfo, p->ct_action, &p->range, commit); 1022 if (err != NF_ACCEPT) 1023 goto drop; 1024 1025 if (commit) { 1026 tcf_ct_act_set_mark(ct, p->mark, p->mark_mask); 1027 tcf_ct_act_set_labels(ct, p->labels, p->labels_mask); 1028 1029 /* This will take care of sending queued events 1030 * even if the connection is already confirmed. 1031 */ 1032 if (nf_conntrack_confirm(skb) != NF_ACCEPT) 1033 goto drop; 1034 } 1035 1036 if (!skip_add) 1037 tcf_ct_flow_table_process_conn(p->ct_ft, ct, ctinfo); 1038 1039out_push: 1040 skb_push_rcsum(skb, nh_ofs); 1041 1042out: 1043 tcf_action_update_bstats(&c->common, skb); 1044 if (defrag) 1045 qdisc_skb_cb(skb)->pkt_len = skb->len; 1046 return retval; 1047 1048drop: 1049 tcf_action_inc_drop_qstats(&c->common); 1050 return TC_ACT_SHOT; 1051} 1052 1053static const struct nla_policy ct_policy[TCA_CT_MAX + 1] = { 1054 [TCA_CT_ACTION] = { .type = NLA_U16 }, 1055 [TCA_CT_PARMS] = NLA_POLICY_EXACT_LEN(sizeof(struct tc_ct)), 1056 [TCA_CT_ZONE] = { .type = NLA_U16 }, 1057 [TCA_CT_MARK] = { .type = NLA_U32 }, 1058 [TCA_CT_MARK_MASK] = { .type = NLA_U32 }, 1059 [TCA_CT_LABELS] = { .type = NLA_BINARY, 1060 .len = 128 / BITS_PER_BYTE }, 1061 [TCA_CT_LABELS_MASK] = { .type = NLA_BINARY, 1062 .len = 128 / BITS_PER_BYTE }, 1063 [TCA_CT_NAT_IPV4_MIN] = { .type = NLA_U32 }, 1064 [TCA_CT_NAT_IPV4_MAX] = { .type = NLA_U32 }, 1065 [TCA_CT_NAT_IPV6_MIN] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), 1066 [TCA_CT_NAT_IPV6_MAX] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), 1067 [TCA_CT_NAT_PORT_MIN] = { .type = NLA_U16 }, 1068 [TCA_CT_NAT_PORT_MAX] = { .type = NLA_U16 }, 1069}; 1070 1071static int tcf_ct_fill_params_nat(struct tcf_ct_params *p, 1072 struct tc_ct *parm, 1073 struct nlattr **tb, 1074 struct netlink_ext_ack *extack) 1075{ 1076 struct nf_nat_range2 *range; 1077 1078 if (!(p->ct_action & TCA_CT_ACT_NAT)) 1079 return 0; 1080 1081 if (!IS_ENABLED(CONFIG_NF_NAT)) { 1082 NL_SET_ERR_MSG_MOD(extack, "Netfilter nat isn't enabled in kernel"); 1083 return -EOPNOTSUPP; 1084 } 1085 1086 if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST))) 1087 return 0; 1088 1089 if ((p->ct_action & TCA_CT_ACT_NAT_SRC) && 1090 (p->ct_action & TCA_CT_ACT_NAT_DST)) { 1091 NL_SET_ERR_MSG_MOD(extack, "dnat and snat can't be enabled at the same time"); 1092 return -EOPNOTSUPP; 1093 } 1094 1095 range = &p->range; 1096 if (tb[TCA_CT_NAT_IPV4_MIN]) { 1097 struct nlattr *max_attr = tb[TCA_CT_NAT_IPV4_MAX]; 1098 1099 p->ipv4_range = true; 1100 range->flags |= NF_NAT_RANGE_MAP_IPS; 1101 range->min_addr.ip = 1102 nla_get_in_addr(tb[TCA_CT_NAT_IPV4_MIN]); 1103 1104 range->max_addr.ip = max_attr ? 1105 nla_get_in_addr(max_attr) : 1106 range->min_addr.ip; 1107 } else if (tb[TCA_CT_NAT_IPV6_MIN]) { 1108 struct nlattr *max_attr = tb[TCA_CT_NAT_IPV6_MAX]; 1109 1110 p->ipv4_range = false; 1111 range->flags |= NF_NAT_RANGE_MAP_IPS; 1112 range->min_addr.in6 = 1113 nla_get_in6_addr(tb[TCA_CT_NAT_IPV6_MIN]); 1114 1115 range->max_addr.in6 = max_attr ? 1116 nla_get_in6_addr(max_attr) : 1117 range->min_addr.in6; 1118 } 1119 1120 if (tb[TCA_CT_NAT_PORT_MIN]) { 1121 range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED; 1122 range->min_proto.all = nla_get_be16(tb[TCA_CT_NAT_PORT_MIN]); 1123 1124 range->max_proto.all = tb[TCA_CT_NAT_PORT_MAX] ? 1125 nla_get_be16(tb[TCA_CT_NAT_PORT_MAX]) : 1126 range->min_proto.all; 1127 } 1128 1129 return 0; 1130} 1131 1132static void tcf_ct_set_key_val(struct nlattr **tb, 1133 void *val, int val_type, 1134 void *mask, int mask_type, 1135 int len) 1136{ 1137 if (!tb[val_type]) 1138 return; 1139 nla_memcpy(val, tb[val_type], len); 1140 1141 if (!mask) 1142 return; 1143 1144 if (mask_type == TCA_CT_UNSPEC || !tb[mask_type]) 1145 memset(mask, 0xff, len); 1146 else 1147 nla_memcpy(mask, tb[mask_type], len); 1148} 1149 1150static int tcf_ct_fill_params(struct net *net, 1151 struct tcf_ct_params *p, 1152 struct tc_ct *parm, 1153 struct nlattr **tb, 1154 struct netlink_ext_ack *extack) 1155{ 1156 struct tc_ct_action_net *tn = net_generic(net, ct_net_id); 1157 struct nf_conntrack_zone zone; 1158 struct nf_conn *tmpl; 1159 int err; 1160 1161 p->zone = NF_CT_DEFAULT_ZONE_ID; 1162 1163 tcf_ct_set_key_val(tb, 1164 &p->ct_action, TCA_CT_ACTION, 1165 NULL, TCA_CT_UNSPEC, 1166 sizeof(p->ct_action)); 1167 1168 if (p->ct_action & TCA_CT_ACT_CLEAR) 1169 return 0; 1170 1171 err = tcf_ct_fill_params_nat(p, parm, tb, extack); 1172 if (err) 1173 return err; 1174 1175 if (tb[TCA_CT_MARK]) { 1176 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)) { 1177 NL_SET_ERR_MSG_MOD(extack, "Conntrack mark isn't enabled."); 1178 return -EOPNOTSUPP; 1179 } 1180 tcf_ct_set_key_val(tb, 1181 &p->mark, TCA_CT_MARK, 1182 &p->mark_mask, TCA_CT_MARK_MASK, 1183 sizeof(p->mark)); 1184 } 1185 1186 if (tb[TCA_CT_LABELS]) { 1187 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)) { 1188 NL_SET_ERR_MSG_MOD(extack, "Conntrack labels isn't enabled."); 1189 return -EOPNOTSUPP; 1190 } 1191 1192 if (!tn->labels) { 1193 NL_SET_ERR_MSG_MOD(extack, "Failed to set connlabel length"); 1194 return -EOPNOTSUPP; 1195 } 1196 tcf_ct_set_key_val(tb, 1197 p->labels, TCA_CT_LABELS, 1198 p->labels_mask, TCA_CT_LABELS_MASK, 1199 sizeof(p->labels)); 1200 } 1201 1202 if (tb[TCA_CT_ZONE]) { 1203 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)) { 1204 NL_SET_ERR_MSG_MOD(extack, "Conntrack zones isn't enabled."); 1205 return -EOPNOTSUPP; 1206 } 1207 1208 tcf_ct_set_key_val(tb, 1209 &p->zone, TCA_CT_ZONE, 1210 NULL, TCA_CT_UNSPEC, 1211 sizeof(p->zone)); 1212 } 1213 1214 nf_ct_zone_init(&zone, p->zone, NF_CT_DEFAULT_ZONE_DIR, 0); 1215 tmpl = nf_ct_tmpl_alloc(net, &zone, GFP_KERNEL); 1216 if (!tmpl) { 1217 NL_SET_ERR_MSG_MOD(extack, "Failed to allocate conntrack template"); 1218 return -ENOMEM; 1219 } 1220 __set_bit(IPS_CONFIRMED_BIT, &tmpl->status); 1221 nf_conntrack_get(&tmpl->ct_general); 1222 p->tmpl = tmpl; 1223 1224 return 0; 1225} 1226 1227static int tcf_ct_init(struct net *net, struct nlattr *nla, 1228 struct nlattr *est, struct tc_action **a, 1229 int replace, int bind, bool rtnl_held, 1230 struct tcf_proto *tp, u32 flags, 1231 struct netlink_ext_ack *extack) 1232{ 1233 struct tc_action_net *tn = net_generic(net, ct_net_id); 1234 struct tcf_ct_params *params = NULL; 1235 struct nlattr *tb[TCA_CT_MAX + 1]; 1236 struct tcf_chain *goto_ch = NULL; 1237 struct tc_ct *parm; 1238 struct tcf_ct *c; 1239 int err, res = 0; 1240 u32 index; 1241 1242 if (!nla) { 1243 NL_SET_ERR_MSG_MOD(extack, "Ct requires attributes to be passed"); 1244 return -EINVAL; 1245 } 1246 1247 err = nla_parse_nested(tb, TCA_CT_MAX, nla, ct_policy, extack); 1248 if (err < 0) 1249 return err; 1250 1251 if (!tb[TCA_CT_PARMS]) { 1252 NL_SET_ERR_MSG_MOD(extack, "Missing required ct parameters"); 1253 return -EINVAL; 1254 } 1255 parm = nla_data(tb[TCA_CT_PARMS]); 1256 index = parm->index; 1257 err = tcf_idr_check_alloc(tn, &index, a, bind); 1258 if (err < 0) 1259 return err; 1260 1261 if (!err) { 1262 err = tcf_idr_create_from_flags(tn, index, est, a, 1263 &act_ct_ops, bind, flags); 1264 if (err) { 1265 tcf_idr_cleanup(tn, index); 1266 return err; 1267 } 1268 res = ACT_P_CREATED; 1269 } else { 1270 if (bind) 1271 return 0; 1272 1273 if (!replace) { 1274 tcf_idr_release(*a, bind); 1275 return -EEXIST; 1276 } 1277 } 1278 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); 1279 if (err < 0) 1280 goto cleanup; 1281 1282 c = to_ct(*a); 1283 1284 params = kzalloc(sizeof(*params), GFP_KERNEL); 1285 if (unlikely(!params)) { 1286 err = -ENOMEM; 1287 goto cleanup; 1288 } 1289 1290 err = tcf_ct_fill_params(net, params, parm, tb, extack); 1291 if (err) 1292 goto cleanup; 1293 1294 err = tcf_ct_flow_table_get(params); 1295 if (err) 1296 goto cleanup_params; 1297 1298 spin_lock_bh(&c->tcf_lock); 1299 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); 1300 params = rcu_replace_pointer(c->params, params, 1301 lockdep_is_held(&c->tcf_lock)); 1302 spin_unlock_bh(&c->tcf_lock); 1303 1304 if (goto_ch) 1305 tcf_chain_put_by_act(goto_ch); 1306 if (params) 1307 call_rcu(¶ms->rcu, tcf_ct_params_free); 1308 1309 return res; 1310 1311cleanup_params: 1312 if (params->tmpl) 1313 nf_ct_put(params->tmpl); 1314cleanup: 1315 if (goto_ch) 1316 tcf_chain_put_by_act(goto_ch); 1317 kfree(params); 1318 tcf_idr_release(*a, bind); 1319 return err; 1320} 1321 1322static void tcf_ct_cleanup(struct tc_action *a) 1323{ 1324 struct tcf_ct_params *params; 1325 struct tcf_ct *c = to_ct(a); 1326 1327 params = rcu_dereference_protected(c->params, 1); 1328 if (params) 1329 call_rcu(¶ms->rcu, tcf_ct_params_free); 1330} 1331 1332static int tcf_ct_dump_key_val(struct sk_buff *skb, 1333 void *val, int val_type, 1334 void *mask, int mask_type, 1335 int len) 1336{ 1337 int err; 1338 1339 if (mask && !memchr_inv(mask, 0, len)) 1340 return 0; 1341 1342 err = nla_put(skb, val_type, len, val); 1343 if (err) 1344 return err; 1345 1346 if (mask_type != TCA_CT_UNSPEC) { 1347 err = nla_put(skb, mask_type, len, mask); 1348 if (err) 1349 return err; 1350 } 1351 1352 return 0; 1353} 1354 1355static int tcf_ct_dump_nat(struct sk_buff *skb, struct tcf_ct_params *p) 1356{ 1357 struct nf_nat_range2 *range = &p->range; 1358 1359 if (!(p->ct_action & TCA_CT_ACT_NAT)) 1360 return 0; 1361 1362 if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST))) 1363 return 0; 1364 1365 if (range->flags & NF_NAT_RANGE_MAP_IPS) { 1366 if (p->ipv4_range) { 1367 if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MIN, 1368 range->min_addr.ip)) 1369 return -1; 1370 if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MAX, 1371 range->max_addr.ip)) 1372 return -1; 1373 } else { 1374 if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MIN, 1375 &range->min_addr.in6)) 1376 return -1; 1377 if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MAX, 1378 &range->max_addr.in6)) 1379 return -1; 1380 } 1381 } 1382 1383 if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) { 1384 if (nla_put_be16(skb, TCA_CT_NAT_PORT_MIN, 1385 range->min_proto.all)) 1386 return -1; 1387 if (nla_put_be16(skb, TCA_CT_NAT_PORT_MAX, 1388 range->max_proto.all)) 1389 return -1; 1390 } 1391 1392 return 0; 1393} 1394 1395static inline int tcf_ct_dump(struct sk_buff *skb, struct tc_action *a, 1396 int bind, int ref) 1397{ 1398 unsigned char *b = skb_tail_pointer(skb); 1399 struct tcf_ct *c = to_ct(a); 1400 struct tcf_ct_params *p; 1401 1402 struct tc_ct opt = { 1403 .index = c->tcf_index, 1404 .refcnt = refcount_read(&c->tcf_refcnt) - ref, 1405 .bindcnt = atomic_read(&c->tcf_bindcnt) - bind, 1406 }; 1407 struct tcf_t t; 1408 1409 spin_lock_bh(&c->tcf_lock); 1410 p = rcu_dereference_protected(c->params, 1411 lockdep_is_held(&c->tcf_lock)); 1412 opt.action = c->tcf_action; 1413 1414 if (tcf_ct_dump_key_val(skb, 1415 &p->ct_action, TCA_CT_ACTION, 1416 NULL, TCA_CT_UNSPEC, 1417 sizeof(p->ct_action))) 1418 goto nla_put_failure; 1419 1420 if (p->ct_action & TCA_CT_ACT_CLEAR) 1421 goto skip_dump; 1422 1423 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && 1424 tcf_ct_dump_key_val(skb, 1425 &p->mark, TCA_CT_MARK, 1426 &p->mark_mask, TCA_CT_MARK_MASK, 1427 sizeof(p->mark))) 1428 goto nla_put_failure; 1429 1430 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 1431 tcf_ct_dump_key_val(skb, 1432 p->labels, TCA_CT_LABELS, 1433 p->labels_mask, TCA_CT_LABELS_MASK, 1434 sizeof(p->labels))) 1435 goto nla_put_failure; 1436 1437 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 1438 tcf_ct_dump_key_val(skb, 1439 &p->zone, TCA_CT_ZONE, 1440 NULL, TCA_CT_UNSPEC, 1441 sizeof(p->zone))) 1442 goto nla_put_failure; 1443 1444 if (tcf_ct_dump_nat(skb, p)) 1445 goto nla_put_failure; 1446 1447skip_dump: 1448 if (nla_put(skb, TCA_CT_PARMS, sizeof(opt), &opt)) 1449 goto nla_put_failure; 1450 1451 tcf_tm_dump(&t, &c->tcf_tm); 1452 if (nla_put_64bit(skb, TCA_CT_TM, sizeof(t), &t, TCA_CT_PAD)) 1453 goto nla_put_failure; 1454 spin_unlock_bh(&c->tcf_lock); 1455 1456 return skb->len; 1457nla_put_failure: 1458 spin_unlock_bh(&c->tcf_lock); 1459 nlmsg_trim(skb, b); 1460 return -1; 1461} 1462 1463static int tcf_ct_walker(struct net *net, struct sk_buff *skb, 1464 struct netlink_callback *cb, int type, 1465 const struct tc_action_ops *ops, 1466 struct netlink_ext_ack *extack) 1467{ 1468 struct tc_action_net *tn = net_generic(net, ct_net_id); 1469 1470 return tcf_generic_walker(tn, skb, cb, type, ops, extack); 1471} 1472 1473static int tcf_ct_search(struct net *net, struct tc_action **a, u32 index) 1474{ 1475 struct tc_action_net *tn = net_generic(net, ct_net_id); 1476 1477 return tcf_idr_search(tn, a, index); 1478} 1479 1480static void tcf_stats_update(struct tc_action *a, u64 bytes, u64 packets, 1481 u64 drops, u64 lastuse, bool hw) 1482{ 1483 struct tcf_ct *c = to_ct(a); 1484 1485 tcf_action_update_stats(a, bytes, packets, drops, hw); 1486 c->tcf_tm.lastuse = max_t(u64, c->tcf_tm.lastuse, lastuse); 1487} 1488 1489static struct tc_action_ops act_ct_ops = { 1490 .kind = "ct", 1491 .id = TCA_ID_CT, 1492 .owner = THIS_MODULE, 1493 .act = tcf_ct_act, 1494 .dump = tcf_ct_dump, 1495 .init = tcf_ct_init, 1496 .cleanup = tcf_ct_cleanup, 1497 .walk = tcf_ct_walker, 1498 .lookup = tcf_ct_search, 1499 .stats_update = tcf_stats_update, 1500 .size = sizeof(struct tcf_ct), 1501}; 1502 1503static __net_init int ct_init_net(struct net *net) 1504{ 1505 unsigned int n_bits = sizeof_field(struct tcf_ct_params, labels) * 8; 1506 struct tc_ct_action_net *tn = net_generic(net, ct_net_id); 1507 1508 if (nf_connlabels_get(net, n_bits - 1)) { 1509 tn->labels = false; 1510 pr_err("act_ct: Failed to set connlabels length"); 1511 } else { 1512 tn->labels = true; 1513 } 1514 1515 return tc_action_net_init(net, &tn->tn, &act_ct_ops); 1516} 1517 1518static void __net_exit ct_exit_net(struct list_head *net_list) 1519{ 1520 struct net *net; 1521 1522 rtnl_lock(); 1523 list_for_each_entry(net, net_list, exit_list) { 1524 struct tc_ct_action_net *tn = net_generic(net, ct_net_id); 1525 1526 if (tn->labels) 1527 nf_connlabels_put(net); 1528 } 1529 rtnl_unlock(); 1530 1531 tc_action_net_exit(net_list, ct_net_id); 1532} 1533 1534static struct pernet_operations ct_net_ops = { 1535 .init = ct_init_net, 1536 .exit_batch = ct_exit_net, 1537 .id = &ct_net_id, 1538 .size = sizeof(struct tc_ct_action_net), 1539}; 1540 1541static int __init ct_init_module(void) 1542{ 1543 int err; 1544 1545 act_ct_wq = alloc_ordered_workqueue("act_ct_workqueue", 0); 1546 if (!act_ct_wq) 1547 return -ENOMEM; 1548 1549 err = tcf_ct_flow_tables_init(); 1550 if (err) 1551 goto err_tbl_init; 1552 1553 err = tcf_register_action(&act_ct_ops, &ct_net_ops); 1554 if (err) 1555 goto err_register; 1556 1557 return 0; 1558 1559err_register: 1560 tcf_ct_flow_tables_uninit(); 1561err_tbl_init: 1562 destroy_workqueue(act_ct_wq); 1563 return err; 1564} 1565 1566static void __exit ct_cleanup_module(void) 1567{ 1568 tcf_unregister_action(&act_ct_ops, &ct_net_ops); 1569 tcf_ct_flow_tables_uninit(); 1570 destroy_workqueue(act_ct_wq); 1571} 1572 1573module_init(ct_init_module); 1574module_exit(ct_cleanup_module); 1575MODULE_AUTHOR("Paul Blakey <paulb@mellanox.com>"); 1576MODULE_AUTHOR("Yossi Kuperman <yossiku@mellanox.com>"); 1577MODULE_AUTHOR("Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>"); 1578MODULE_DESCRIPTION("Connection tracking action"); 1579MODULE_LICENSE("GPL v2"); 1580