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