1 /* 2 * Copyright (c) 2015 Nicira, Inc. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of version 2 of the GNU General Public 6 * License as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/openvswitch.h> 16 #include <net/ip.h> 17 #include <net/netfilter/nf_conntrack_core.h> 18 #include <net/netfilter/nf_conntrack_helper.h> 19 #include <net/netfilter/nf_conntrack_labels.h> 20 #include <net/netfilter/nf_conntrack_zones.h> 21 #include <net/netfilter/ipv6/nf_defrag_ipv6.h> 22 23 #include "datapath.h" 24 #include "conntrack.h" 25 #include "flow.h" 26 #include "flow_netlink.h" 27 28 struct ovs_ct_len_tbl { 29 size_t maxlen; 30 size_t minlen; 31 }; 32 33 /* Metadata mark for masked write to conntrack mark */ 34 struct md_mark { 35 u32 value; 36 u32 mask; 37 }; 38 39 /* Metadata label for masked write to conntrack label. */ 40 struct md_labels { 41 struct ovs_key_ct_labels value; 42 struct ovs_key_ct_labels mask; 43 }; 44 45 /* Conntrack action context for execution. */ 46 struct ovs_conntrack_info { 47 struct nf_conntrack_helper *helper; 48 struct nf_conntrack_zone zone; 49 struct nf_conn *ct; 50 u8 commit : 1; 51 u16 family; 52 struct md_mark mark; 53 struct md_labels labels; 54 }; 55 56 static u16 key_to_nfproto(const struct sw_flow_key *key) 57 { 58 switch (ntohs(key->eth.type)) { 59 case ETH_P_IP: 60 return NFPROTO_IPV4; 61 case ETH_P_IPV6: 62 return NFPROTO_IPV6; 63 default: 64 return NFPROTO_UNSPEC; 65 } 66 } 67 68 /* Map SKB connection state into the values used by flow definition. */ 69 static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo) 70 { 71 u8 ct_state = OVS_CS_F_TRACKED; 72 73 switch (ctinfo) { 74 case IP_CT_ESTABLISHED_REPLY: 75 case IP_CT_RELATED_REPLY: 76 case IP_CT_NEW_REPLY: 77 ct_state |= OVS_CS_F_REPLY_DIR; 78 break; 79 default: 80 break; 81 } 82 83 switch (ctinfo) { 84 case IP_CT_ESTABLISHED: 85 case IP_CT_ESTABLISHED_REPLY: 86 ct_state |= OVS_CS_F_ESTABLISHED; 87 break; 88 case IP_CT_RELATED: 89 case IP_CT_RELATED_REPLY: 90 ct_state |= OVS_CS_F_RELATED; 91 break; 92 case IP_CT_NEW: 93 case IP_CT_NEW_REPLY: 94 ct_state |= OVS_CS_F_NEW; 95 break; 96 default: 97 break; 98 } 99 100 return ct_state; 101 } 102 103 static u32 ovs_ct_get_mark(const struct nf_conn *ct) 104 { 105 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) 106 return ct ? ct->mark : 0; 107 #else 108 return 0; 109 #endif 110 } 111 112 static void ovs_ct_get_labels(const struct nf_conn *ct, 113 struct ovs_key_ct_labels *labels) 114 { 115 struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL; 116 117 if (cl) { 118 size_t len = cl->words * sizeof(long); 119 120 if (len > OVS_CT_LABELS_LEN) 121 len = OVS_CT_LABELS_LEN; 122 else if (len < OVS_CT_LABELS_LEN) 123 memset(labels, 0, OVS_CT_LABELS_LEN); 124 memcpy(labels, cl->bits, len); 125 } else { 126 memset(labels, 0, OVS_CT_LABELS_LEN); 127 } 128 } 129 130 static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state, 131 const struct nf_conntrack_zone *zone, 132 const struct nf_conn *ct) 133 { 134 key->ct.state = state; 135 key->ct.zone = zone->id; 136 key->ct.mark = ovs_ct_get_mark(ct); 137 ovs_ct_get_labels(ct, &key->ct.labels); 138 } 139 140 /* Update 'key' based on skb->nfct. If 'post_ct' is true, then OVS has 141 * previously sent the packet to conntrack via the ct action. 142 */ 143 static void ovs_ct_update_key(const struct sk_buff *skb, 144 struct sw_flow_key *key, bool post_ct) 145 { 146 const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt; 147 enum ip_conntrack_info ctinfo; 148 struct nf_conn *ct; 149 u8 state = 0; 150 151 ct = nf_ct_get(skb, &ctinfo); 152 if (ct) { 153 state = ovs_ct_get_state(ctinfo); 154 if (!nf_ct_is_confirmed(ct)) 155 state |= OVS_CS_F_NEW; 156 if (ct->master) 157 state |= OVS_CS_F_RELATED; 158 zone = nf_ct_zone(ct); 159 } else if (post_ct) { 160 state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID; 161 } 162 __ovs_ct_update_key(key, state, zone, ct); 163 } 164 165 void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key) 166 { 167 ovs_ct_update_key(skb, key, false); 168 } 169 170 int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb) 171 { 172 if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, key->ct.state)) 173 return -EMSGSIZE; 174 175 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 176 nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, key->ct.zone)) 177 return -EMSGSIZE; 178 179 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && 180 nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, key->ct.mark)) 181 return -EMSGSIZE; 182 183 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 184 nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(key->ct.labels), 185 &key->ct.labels)) 186 return -EMSGSIZE; 187 188 return 0; 189 } 190 191 static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key, 192 u32 ct_mark, u32 mask) 193 { 194 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) 195 enum ip_conntrack_info ctinfo; 196 struct nf_conn *ct; 197 u32 new_mark; 198 199 200 /* The connection could be invalid, in which case set_mark is no-op. */ 201 ct = nf_ct_get(skb, &ctinfo); 202 if (!ct) 203 return 0; 204 205 new_mark = ct_mark | (ct->mark & ~(mask)); 206 if (ct->mark != new_mark) { 207 ct->mark = new_mark; 208 nf_conntrack_event_cache(IPCT_MARK, ct); 209 key->ct.mark = new_mark; 210 } 211 212 return 0; 213 #else 214 return -ENOTSUPP; 215 #endif 216 } 217 218 static int ovs_ct_set_labels(struct sk_buff *skb, struct sw_flow_key *key, 219 const struct ovs_key_ct_labels *labels, 220 const struct ovs_key_ct_labels *mask) 221 { 222 enum ip_conntrack_info ctinfo; 223 struct nf_conn_labels *cl; 224 struct nf_conn *ct; 225 int err; 226 227 /* The connection could be invalid, in which case set_label is no-op.*/ 228 ct = nf_ct_get(skb, &ctinfo); 229 if (!ct) 230 return 0; 231 232 cl = nf_ct_labels_find(ct); 233 if (!cl) { 234 nf_ct_labels_ext_add(ct); 235 cl = nf_ct_labels_find(ct); 236 } 237 if (!cl || cl->words * sizeof(long) < OVS_CT_LABELS_LEN) 238 return -ENOSPC; 239 240 err = nf_connlabels_replace(ct, (u32 *)labels, (u32 *)mask, 241 OVS_CT_LABELS_LEN / sizeof(u32)); 242 if (err) 243 return err; 244 245 ovs_ct_get_labels(ct, &key->ct.labels); 246 return 0; 247 } 248 249 /* 'skb' should already be pulled to nh_ofs. */ 250 static int ovs_ct_helper(struct sk_buff *skb, u16 proto) 251 { 252 const struct nf_conntrack_helper *helper; 253 const struct nf_conn_help *help; 254 enum ip_conntrack_info ctinfo; 255 unsigned int protoff; 256 struct nf_conn *ct; 257 258 ct = nf_ct_get(skb, &ctinfo); 259 if (!ct || ctinfo == IP_CT_RELATED_REPLY) 260 return NF_ACCEPT; 261 262 help = nfct_help(ct); 263 if (!help) 264 return NF_ACCEPT; 265 266 helper = rcu_dereference(help->helper); 267 if (!helper) 268 return NF_ACCEPT; 269 270 switch (proto) { 271 case NFPROTO_IPV4: 272 protoff = ip_hdrlen(skb); 273 break; 274 case NFPROTO_IPV6: { 275 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 276 __be16 frag_off; 277 int ofs; 278 279 ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, 280 &frag_off); 281 if (ofs < 0 || (frag_off & htons(~0x7)) != 0) { 282 pr_debug("proto header not found\n"); 283 return NF_ACCEPT; 284 } 285 protoff = ofs; 286 break; 287 } 288 default: 289 WARN_ONCE(1, "helper invoked on non-IP family!"); 290 return NF_DROP; 291 } 292 293 return helper->help(skb, protoff, ct, ctinfo); 294 } 295 296 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero 297 * value if 'skb' is freed. 298 */ 299 static int handle_fragments(struct net *net, struct sw_flow_key *key, 300 u16 zone, struct sk_buff *skb) 301 { 302 struct ovs_skb_cb ovs_cb = *OVS_CB(skb); 303 304 if (key->eth.type == htons(ETH_P_IP)) { 305 enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone; 306 int err; 307 308 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); 309 err = ip_defrag(net, skb, user); 310 if (err) 311 return err; 312 313 ovs_cb.mru = IPCB(skb)->frag_max_size; 314 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) 315 } else if (key->eth.type == htons(ETH_P_IPV6)) { 316 enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone; 317 struct sk_buff *reasm; 318 319 memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); 320 reasm = nf_ct_frag6_gather(net, skb, user); 321 if (!reasm) 322 return -EINPROGRESS; 323 324 if (skb == reasm) { 325 kfree_skb(skb); 326 return -EINVAL; 327 } 328 329 /* Don't free 'skb' even though it is one of the original 330 * fragments, as we're going to morph it into the head. 331 */ 332 skb_get(skb); 333 nf_ct_frag6_consume_orig(reasm); 334 335 key->ip.proto = ipv6_hdr(reasm)->nexthdr; 336 skb_morph(skb, reasm); 337 skb->next = reasm->next; 338 consume_skb(reasm); 339 ovs_cb.mru = IP6CB(skb)->frag_max_size; 340 #endif 341 } else { 342 kfree_skb(skb); 343 return -EPFNOSUPPORT; 344 } 345 346 key->ip.frag = OVS_FRAG_TYPE_NONE; 347 skb_clear_hash(skb); 348 skb->ignore_df = 1; 349 *OVS_CB(skb) = ovs_cb; 350 351 return 0; 352 } 353 354 static struct nf_conntrack_expect * 355 ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone, 356 u16 proto, const struct sk_buff *skb) 357 { 358 struct nf_conntrack_tuple tuple; 359 360 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple)) 361 return NULL; 362 return __nf_ct_expect_find(net, zone, &tuple); 363 } 364 365 /* Determine whether skb->nfct is equal to the result of conntrack lookup. */ 366 static bool skb_nfct_cached(const struct net *net, const struct sk_buff *skb, 367 const struct ovs_conntrack_info *info) 368 { 369 enum ip_conntrack_info ctinfo; 370 struct nf_conn *ct; 371 372 ct = nf_ct_get(skb, &ctinfo); 373 if (!ct) 374 return false; 375 if (!net_eq(net, read_pnet(&ct->ct_net))) 376 return false; 377 if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct))) 378 return false; 379 if (info->helper) { 380 struct nf_conn_help *help; 381 382 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER); 383 if (help && rcu_access_pointer(help->helper) != info->helper) 384 return false; 385 } 386 387 return true; 388 } 389 390 static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key, 391 const struct ovs_conntrack_info *info, 392 struct sk_buff *skb) 393 { 394 /* If we are recirculating packets to match on conntrack fields and 395 * committing with a separate conntrack action, then we don't need to 396 * actually run the packet through conntrack twice unless it's for a 397 * different zone. 398 */ 399 if (!skb_nfct_cached(net, skb, info)) { 400 struct nf_conn *tmpl = info->ct; 401 402 /* Associate skb with specified zone. */ 403 if (tmpl) { 404 if (skb->nfct) 405 nf_conntrack_put(skb->nfct); 406 nf_conntrack_get(&tmpl->ct_general); 407 skb->nfct = &tmpl->ct_general; 408 skb->nfctinfo = IP_CT_NEW; 409 } 410 411 if (nf_conntrack_in(net, info->family, NF_INET_PRE_ROUTING, 412 skb) != NF_ACCEPT) 413 return -ENOENT; 414 415 if (ovs_ct_helper(skb, info->family) != NF_ACCEPT) { 416 WARN_ONCE(1, "helper rejected packet"); 417 return -EINVAL; 418 } 419 } 420 421 ovs_ct_update_key(skb, key, true); 422 423 return 0; 424 } 425 426 /* Lookup connection and read fields into key. */ 427 static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key, 428 const struct ovs_conntrack_info *info, 429 struct sk_buff *skb) 430 { 431 struct nf_conntrack_expect *exp; 432 433 exp = ovs_ct_expect_find(net, &info->zone, info->family, skb); 434 if (exp) { 435 u8 state; 436 437 state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED; 438 __ovs_ct_update_key(key, state, &info->zone, exp->master); 439 } else { 440 int err; 441 442 err = __ovs_ct_lookup(net, key, info, skb); 443 if (err) 444 return err; 445 } 446 447 return 0; 448 } 449 450 /* Lookup connection and confirm if unconfirmed. */ 451 static int ovs_ct_commit(struct net *net, struct sw_flow_key *key, 452 const struct ovs_conntrack_info *info, 453 struct sk_buff *skb) 454 { 455 u8 state; 456 int err; 457 458 state = key->ct.state; 459 if (key->ct.zone == info->zone.id && 460 ((state & OVS_CS_F_TRACKED) && !(state & OVS_CS_F_NEW))) { 461 /* Previous lookup has shown that this connection is already 462 * tracked and committed. Skip committing. 463 */ 464 return 0; 465 } 466 467 err = __ovs_ct_lookup(net, key, info, skb); 468 if (err) 469 return err; 470 if (nf_conntrack_confirm(skb) != NF_ACCEPT) 471 return -EINVAL; 472 473 return 0; 474 } 475 476 static bool labels_nonzero(const struct ovs_key_ct_labels *labels) 477 { 478 size_t i; 479 480 for (i = 0; i < sizeof(*labels); i++) 481 if (labels->ct_labels[i]) 482 return true; 483 484 return false; 485 } 486 487 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero 488 * value if 'skb' is freed. 489 */ 490 int ovs_ct_execute(struct net *net, struct sk_buff *skb, 491 struct sw_flow_key *key, 492 const struct ovs_conntrack_info *info) 493 { 494 int nh_ofs; 495 int err; 496 497 /* The conntrack module expects to be working at L3. */ 498 nh_ofs = skb_network_offset(skb); 499 skb_pull(skb, nh_ofs); 500 501 if (key->ip.frag != OVS_FRAG_TYPE_NONE) { 502 err = handle_fragments(net, key, info->zone.id, skb); 503 if (err) 504 return err; 505 } 506 507 if (info->commit) 508 err = ovs_ct_commit(net, key, info, skb); 509 else 510 err = ovs_ct_lookup(net, key, info, skb); 511 if (err) 512 goto err; 513 514 if (info->mark.mask) { 515 err = ovs_ct_set_mark(skb, key, info->mark.value, 516 info->mark.mask); 517 if (err) 518 goto err; 519 } 520 if (labels_nonzero(&info->labels.mask)) 521 err = ovs_ct_set_labels(skb, key, &info->labels.value, 522 &info->labels.mask); 523 err: 524 skb_push(skb, nh_ofs); 525 if (err) 526 kfree_skb(skb); 527 return err; 528 } 529 530 static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name, 531 const struct sw_flow_key *key, bool log) 532 { 533 struct nf_conntrack_helper *helper; 534 struct nf_conn_help *help; 535 536 helper = nf_conntrack_helper_try_module_get(name, info->family, 537 key->ip.proto); 538 if (!helper) { 539 OVS_NLERR(log, "Unknown helper \"%s\"", name); 540 return -EINVAL; 541 } 542 543 help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL); 544 if (!help) { 545 module_put(helper->me); 546 return -ENOMEM; 547 } 548 549 rcu_assign_pointer(help->helper, helper); 550 info->helper = helper; 551 return 0; 552 } 553 554 static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = { 555 [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 }, 556 [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16), 557 .maxlen = sizeof(u16) }, 558 [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark), 559 .maxlen = sizeof(struct md_mark) }, 560 [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels), 561 .maxlen = sizeof(struct md_labels) }, 562 [OVS_CT_ATTR_HELPER] = { .minlen = 1, 563 .maxlen = NF_CT_HELPER_NAME_LEN } 564 }; 565 566 static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info, 567 const char **helper, bool log) 568 { 569 struct nlattr *a; 570 int rem; 571 572 nla_for_each_nested(a, attr, rem) { 573 int type = nla_type(a); 574 int maxlen = ovs_ct_attr_lens[type].maxlen; 575 int minlen = ovs_ct_attr_lens[type].minlen; 576 577 if (type > OVS_CT_ATTR_MAX) { 578 OVS_NLERR(log, 579 "Unknown conntrack attr (type=%d, max=%d)", 580 type, OVS_CT_ATTR_MAX); 581 return -EINVAL; 582 } 583 if (nla_len(a) < minlen || nla_len(a) > maxlen) { 584 OVS_NLERR(log, 585 "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)", 586 type, nla_len(a), maxlen); 587 return -EINVAL; 588 } 589 590 switch (type) { 591 case OVS_CT_ATTR_COMMIT: 592 info->commit = true; 593 break; 594 #ifdef CONFIG_NF_CONNTRACK_ZONES 595 case OVS_CT_ATTR_ZONE: 596 info->zone.id = nla_get_u16(a); 597 break; 598 #endif 599 #ifdef CONFIG_NF_CONNTRACK_MARK 600 case OVS_CT_ATTR_MARK: { 601 struct md_mark *mark = nla_data(a); 602 603 if (!mark->mask) { 604 OVS_NLERR(log, "ct_mark mask cannot be 0"); 605 return -EINVAL; 606 } 607 info->mark = *mark; 608 break; 609 } 610 #endif 611 #ifdef CONFIG_NF_CONNTRACK_LABELS 612 case OVS_CT_ATTR_LABELS: { 613 struct md_labels *labels = nla_data(a); 614 615 if (!labels_nonzero(&labels->mask)) { 616 OVS_NLERR(log, "ct_labels mask cannot be 0"); 617 return -EINVAL; 618 } 619 info->labels = *labels; 620 break; 621 } 622 #endif 623 case OVS_CT_ATTR_HELPER: 624 *helper = nla_data(a); 625 if (!memchr(*helper, '\0', nla_len(a))) { 626 OVS_NLERR(log, "Invalid conntrack helper"); 627 return -EINVAL; 628 } 629 break; 630 default: 631 OVS_NLERR(log, "Unknown conntrack attr (%d)", 632 type); 633 return -EINVAL; 634 } 635 } 636 637 if (rem > 0) { 638 OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem); 639 return -EINVAL; 640 } 641 642 return 0; 643 } 644 645 bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr) 646 { 647 if (attr == OVS_KEY_ATTR_CT_STATE) 648 return true; 649 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 650 attr == OVS_KEY_ATTR_CT_ZONE) 651 return true; 652 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && 653 attr == OVS_KEY_ATTR_CT_MARK) 654 return true; 655 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 656 attr == OVS_KEY_ATTR_CT_LABELS) { 657 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 658 659 return ovs_net->xt_label; 660 } 661 662 return false; 663 } 664 665 int ovs_ct_copy_action(struct net *net, const struct nlattr *attr, 666 const struct sw_flow_key *key, 667 struct sw_flow_actions **sfa, bool log) 668 { 669 struct ovs_conntrack_info ct_info; 670 const char *helper = NULL; 671 u16 family; 672 int err; 673 674 family = key_to_nfproto(key); 675 if (family == NFPROTO_UNSPEC) { 676 OVS_NLERR(log, "ct family unspecified"); 677 return -EINVAL; 678 } 679 680 memset(&ct_info, 0, sizeof(ct_info)); 681 ct_info.family = family; 682 683 nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID, 684 NF_CT_DEFAULT_ZONE_DIR, 0); 685 686 err = parse_ct(attr, &ct_info, &helper, log); 687 if (err) 688 return err; 689 690 /* Set up template for tracking connections in specific zones. */ 691 ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL); 692 if (!ct_info.ct) { 693 OVS_NLERR(log, "Failed to allocate conntrack template"); 694 return -ENOMEM; 695 } 696 if (helper) { 697 err = ovs_ct_add_helper(&ct_info, helper, key, log); 698 if (err) 699 goto err_free_ct; 700 } 701 702 err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info, 703 sizeof(ct_info), log); 704 if (err) 705 goto err_free_ct; 706 707 __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status); 708 nf_conntrack_get(&ct_info.ct->ct_general); 709 return 0; 710 err_free_ct: 711 nf_conntrack_free(ct_info.ct); 712 return err; 713 } 714 715 int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info, 716 struct sk_buff *skb) 717 { 718 struct nlattr *start; 719 720 start = nla_nest_start(skb, OVS_ACTION_ATTR_CT); 721 if (!start) 722 return -EMSGSIZE; 723 724 if (ct_info->commit && nla_put_flag(skb, OVS_CT_ATTR_COMMIT)) 725 return -EMSGSIZE; 726 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 727 nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id)) 728 return -EMSGSIZE; 729 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask && 730 nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark), 731 &ct_info->mark)) 732 return -EMSGSIZE; 733 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 734 labels_nonzero(&ct_info->labels.mask) && 735 nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels), 736 &ct_info->labels)) 737 return -EMSGSIZE; 738 if (ct_info->helper) { 739 if (nla_put_string(skb, OVS_CT_ATTR_HELPER, 740 ct_info->helper->name)) 741 return -EMSGSIZE; 742 } 743 744 nla_nest_end(skb, start); 745 746 return 0; 747 } 748 749 void ovs_ct_free_action(const struct nlattr *a) 750 { 751 struct ovs_conntrack_info *ct_info = nla_data(a); 752 753 if (ct_info->helper) 754 module_put(ct_info->helper->me); 755 if (ct_info->ct) 756 nf_ct_put(ct_info->ct); 757 } 758 759 void ovs_ct_init(struct net *net) 760 { 761 unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE; 762 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 763 764 if (nf_connlabels_get(net, n_bits)) { 765 ovs_net->xt_label = false; 766 OVS_NLERR(true, "Failed to set connlabel length"); 767 } else { 768 ovs_net->xt_label = true; 769 } 770 } 771 772 void ovs_ct_exit(struct net *net) 773 { 774 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 775 776 if (ovs_net->xt_label) 777 nf_connlabels_put(net); 778 } 779