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 key->ip.proto = ipv6_hdr(reasm)->nexthdr; 325 ovs_cb.mru = IP6CB(skb)->frag_max_size; 326 #endif 327 } else { 328 kfree_skb(skb); 329 return -EPFNOSUPPORT; 330 } 331 332 key->ip.frag = OVS_FRAG_TYPE_NONE; 333 skb_clear_hash(skb); 334 skb->ignore_df = 1; 335 *OVS_CB(skb) = ovs_cb; 336 337 return 0; 338 } 339 340 static struct nf_conntrack_expect * 341 ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone, 342 u16 proto, const struct sk_buff *skb) 343 { 344 struct nf_conntrack_tuple tuple; 345 346 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple)) 347 return NULL; 348 return __nf_ct_expect_find(net, zone, &tuple); 349 } 350 351 /* Determine whether skb->nfct is equal to the result of conntrack lookup. */ 352 static bool skb_nfct_cached(const struct net *net, const struct sk_buff *skb, 353 const struct ovs_conntrack_info *info) 354 { 355 enum ip_conntrack_info ctinfo; 356 struct nf_conn *ct; 357 358 ct = nf_ct_get(skb, &ctinfo); 359 if (!ct) 360 return false; 361 if (!net_eq(net, read_pnet(&ct->ct_net))) 362 return false; 363 if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct))) 364 return false; 365 if (info->helper) { 366 struct nf_conn_help *help; 367 368 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER); 369 if (help && rcu_access_pointer(help->helper) != info->helper) 370 return false; 371 } 372 373 return true; 374 } 375 376 static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key, 377 const struct ovs_conntrack_info *info, 378 struct sk_buff *skb) 379 { 380 /* If we are recirculating packets to match on conntrack fields and 381 * committing with a separate conntrack action, then we don't need to 382 * actually run the packet through conntrack twice unless it's for a 383 * different zone. 384 */ 385 if (!skb_nfct_cached(net, skb, info)) { 386 struct nf_conn *tmpl = info->ct; 387 388 /* Associate skb with specified zone. */ 389 if (tmpl) { 390 if (skb->nfct) 391 nf_conntrack_put(skb->nfct); 392 nf_conntrack_get(&tmpl->ct_general); 393 skb->nfct = &tmpl->ct_general; 394 skb->nfctinfo = IP_CT_NEW; 395 } 396 397 if (nf_conntrack_in(net, info->family, NF_INET_PRE_ROUTING, 398 skb) != NF_ACCEPT) 399 return -ENOENT; 400 401 if (ovs_ct_helper(skb, info->family) != NF_ACCEPT) { 402 WARN_ONCE(1, "helper rejected packet"); 403 return -EINVAL; 404 } 405 } 406 407 ovs_ct_update_key(skb, key, true); 408 409 return 0; 410 } 411 412 /* Lookup connection and read fields into key. */ 413 static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key, 414 const struct ovs_conntrack_info *info, 415 struct sk_buff *skb) 416 { 417 struct nf_conntrack_expect *exp; 418 419 exp = ovs_ct_expect_find(net, &info->zone, info->family, skb); 420 if (exp) { 421 u8 state; 422 423 state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED; 424 __ovs_ct_update_key(key, state, &info->zone, exp->master); 425 } else { 426 int err; 427 428 err = __ovs_ct_lookup(net, key, info, skb); 429 if (err) 430 return err; 431 } 432 433 return 0; 434 } 435 436 /* Lookup connection and confirm if unconfirmed. */ 437 static int ovs_ct_commit(struct net *net, struct sw_flow_key *key, 438 const struct ovs_conntrack_info *info, 439 struct sk_buff *skb) 440 { 441 u8 state; 442 int err; 443 444 state = key->ct.state; 445 if (key->ct.zone == info->zone.id && 446 ((state & OVS_CS_F_TRACKED) && !(state & OVS_CS_F_NEW))) { 447 /* Previous lookup has shown that this connection is already 448 * tracked and committed. Skip committing. 449 */ 450 return 0; 451 } 452 453 err = __ovs_ct_lookup(net, key, info, skb); 454 if (err) 455 return err; 456 if (nf_conntrack_confirm(skb) != NF_ACCEPT) 457 return -EINVAL; 458 459 return 0; 460 } 461 462 static bool labels_nonzero(const struct ovs_key_ct_labels *labels) 463 { 464 size_t i; 465 466 for (i = 0; i < sizeof(*labels); i++) 467 if (labels->ct_labels[i]) 468 return true; 469 470 return false; 471 } 472 473 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero 474 * value if 'skb' is freed. 475 */ 476 int ovs_ct_execute(struct net *net, struct sk_buff *skb, 477 struct sw_flow_key *key, 478 const struct ovs_conntrack_info *info) 479 { 480 int nh_ofs; 481 int err; 482 483 /* The conntrack module expects to be working at L3. */ 484 nh_ofs = skb_network_offset(skb); 485 skb_pull(skb, nh_ofs); 486 487 if (key->ip.frag != OVS_FRAG_TYPE_NONE) { 488 err = handle_fragments(net, key, info->zone.id, skb); 489 if (err) 490 return err; 491 } 492 493 if (info->commit) 494 err = ovs_ct_commit(net, key, info, skb); 495 else 496 err = ovs_ct_lookup(net, key, info, skb); 497 if (err) 498 goto err; 499 500 if (info->mark.mask) { 501 err = ovs_ct_set_mark(skb, key, info->mark.value, 502 info->mark.mask); 503 if (err) 504 goto err; 505 } 506 if (labels_nonzero(&info->labels.mask)) 507 err = ovs_ct_set_labels(skb, key, &info->labels.value, 508 &info->labels.mask); 509 err: 510 skb_push(skb, nh_ofs); 511 if (err) 512 kfree_skb(skb); 513 return err; 514 } 515 516 static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name, 517 const struct sw_flow_key *key, bool log) 518 { 519 struct nf_conntrack_helper *helper; 520 struct nf_conn_help *help; 521 522 helper = nf_conntrack_helper_try_module_get(name, info->family, 523 key->ip.proto); 524 if (!helper) { 525 OVS_NLERR(log, "Unknown helper \"%s\"", name); 526 return -EINVAL; 527 } 528 529 help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL); 530 if (!help) { 531 module_put(helper->me); 532 return -ENOMEM; 533 } 534 535 rcu_assign_pointer(help->helper, helper); 536 info->helper = helper; 537 return 0; 538 } 539 540 static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = { 541 [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 }, 542 [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16), 543 .maxlen = sizeof(u16) }, 544 [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark), 545 .maxlen = sizeof(struct md_mark) }, 546 [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels), 547 .maxlen = sizeof(struct md_labels) }, 548 [OVS_CT_ATTR_HELPER] = { .minlen = 1, 549 .maxlen = NF_CT_HELPER_NAME_LEN } 550 }; 551 552 static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info, 553 const char **helper, bool log) 554 { 555 struct nlattr *a; 556 int rem; 557 558 nla_for_each_nested(a, attr, rem) { 559 int type = nla_type(a); 560 int maxlen = ovs_ct_attr_lens[type].maxlen; 561 int minlen = ovs_ct_attr_lens[type].minlen; 562 563 if (type > OVS_CT_ATTR_MAX) { 564 OVS_NLERR(log, 565 "Unknown conntrack attr (type=%d, max=%d)", 566 type, OVS_CT_ATTR_MAX); 567 return -EINVAL; 568 } 569 if (nla_len(a) < minlen || nla_len(a) > maxlen) { 570 OVS_NLERR(log, 571 "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)", 572 type, nla_len(a), maxlen); 573 return -EINVAL; 574 } 575 576 switch (type) { 577 case OVS_CT_ATTR_COMMIT: 578 info->commit = true; 579 break; 580 #ifdef CONFIG_NF_CONNTRACK_ZONES 581 case OVS_CT_ATTR_ZONE: 582 info->zone.id = nla_get_u16(a); 583 break; 584 #endif 585 #ifdef CONFIG_NF_CONNTRACK_MARK 586 case OVS_CT_ATTR_MARK: { 587 struct md_mark *mark = nla_data(a); 588 589 if (!mark->mask) { 590 OVS_NLERR(log, "ct_mark mask cannot be 0"); 591 return -EINVAL; 592 } 593 info->mark = *mark; 594 break; 595 } 596 #endif 597 #ifdef CONFIG_NF_CONNTRACK_LABELS 598 case OVS_CT_ATTR_LABELS: { 599 struct md_labels *labels = nla_data(a); 600 601 if (!labels_nonzero(&labels->mask)) { 602 OVS_NLERR(log, "ct_labels mask cannot be 0"); 603 return -EINVAL; 604 } 605 info->labels = *labels; 606 break; 607 } 608 #endif 609 case OVS_CT_ATTR_HELPER: 610 *helper = nla_data(a); 611 if (!memchr(*helper, '\0', nla_len(a))) { 612 OVS_NLERR(log, "Invalid conntrack helper"); 613 return -EINVAL; 614 } 615 break; 616 default: 617 OVS_NLERR(log, "Unknown conntrack attr (%d)", 618 type); 619 return -EINVAL; 620 } 621 } 622 623 if (rem > 0) { 624 OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem); 625 return -EINVAL; 626 } 627 628 return 0; 629 } 630 631 bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr) 632 { 633 if (attr == OVS_KEY_ATTR_CT_STATE) 634 return true; 635 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 636 attr == OVS_KEY_ATTR_CT_ZONE) 637 return true; 638 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && 639 attr == OVS_KEY_ATTR_CT_MARK) 640 return true; 641 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 642 attr == OVS_KEY_ATTR_CT_LABELS) { 643 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 644 645 return ovs_net->xt_label; 646 } 647 648 return false; 649 } 650 651 int ovs_ct_copy_action(struct net *net, const struct nlattr *attr, 652 const struct sw_flow_key *key, 653 struct sw_flow_actions **sfa, bool log) 654 { 655 struct ovs_conntrack_info ct_info; 656 const char *helper = NULL; 657 u16 family; 658 int err; 659 660 family = key_to_nfproto(key); 661 if (family == NFPROTO_UNSPEC) { 662 OVS_NLERR(log, "ct family unspecified"); 663 return -EINVAL; 664 } 665 666 memset(&ct_info, 0, sizeof(ct_info)); 667 ct_info.family = family; 668 669 nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID, 670 NF_CT_DEFAULT_ZONE_DIR, 0); 671 672 err = parse_ct(attr, &ct_info, &helper, log); 673 if (err) 674 return err; 675 676 /* Set up template for tracking connections in specific zones. */ 677 ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL); 678 if (!ct_info.ct) { 679 OVS_NLERR(log, "Failed to allocate conntrack template"); 680 return -ENOMEM; 681 } 682 if (helper) { 683 err = ovs_ct_add_helper(&ct_info, helper, key, log); 684 if (err) 685 goto err_free_ct; 686 } 687 688 err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info, 689 sizeof(ct_info), log); 690 if (err) 691 goto err_free_ct; 692 693 __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status); 694 nf_conntrack_get(&ct_info.ct->ct_general); 695 return 0; 696 err_free_ct: 697 nf_conntrack_free(ct_info.ct); 698 return err; 699 } 700 701 int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info, 702 struct sk_buff *skb) 703 { 704 struct nlattr *start; 705 706 start = nla_nest_start(skb, OVS_ACTION_ATTR_CT); 707 if (!start) 708 return -EMSGSIZE; 709 710 if (ct_info->commit && nla_put_flag(skb, OVS_CT_ATTR_COMMIT)) 711 return -EMSGSIZE; 712 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 713 nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id)) 714 return -EMSGSIZE; 715 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask && 716 nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark), 717 &ct_info->mark)) 718 return -EMSGSIZE; 719 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 720 labels_nonzero(&ct_info->labels.mask) && 721 nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels), 722 &ct_info->labels)) 723 return -EMSGSIZE; 724 if (ct_info->helper) { 725 if (nla_put_string(skb, OVS_CT_ATTR_HELPER, 726 ct_info->helper->name)) 727 return -EMSGSIZE; 728 } 729 730 nla_nest_end(skb, start); 731 732 return 0; 733 } 734 735 void ovs_ct_free_action(const struct nlattr *a) 736 { 737 struct ovs_conntrack_info *ct_info = nla_data(a); 738 739 if (ct_info->helper) 740 module_put(ct_info->helper->me); 741 if (ct_info->ct) 742 nf_ct_put(ct_info->ct); 743 } 744 745 void ovs_ct_init(struct net *net) 746 { 747 unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE; 748 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 749 750 if (nf_connlabels_get(net, n_bits)) { 751 ovs_net->xt_label = false; 752 OVS_NLERR(true, "Failed to set connlabel length"); 753 } else { 754 ovs_net->xt_label = true; 755 } 756 } 757 758 void ovs_ct_exit(struct net *net) 759 { 760 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 761 762 if (ovs_net->xt_label) 763 nf_connlabels_put(net); 764 } 765