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_label { 41 struct ovs_key_ct_label value; 42 struct ovs_key_ct_label 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 u32 flags; 51 u16 family; 52 struct md_mark mark; 53 struct md_label label; 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_label(const struct nf_conn *ct, 113 struct ovs_key_ct_label *label) 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_LABEL_LEN) 121 len = OVS_CT_LABEL_LEN; 122 else if (len < OVS_CT_LABEL_LEN) 123 memset(label, 0, OVS_CT_LABEL_LEN); 124 memcpy(label, cl->bits, len); 125 } else { 126 memset(label, 0, OVS_CT_LABEL_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_label(ct, &key->ct.label); 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 (ct->master) 155 state |= OVS_CS_F_RELATED; 156 zone = nf_ct_zone(ct); 157 } else if (post_ct) { 158 state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID; 159 } 160 __ovs_ct_update_key(key, state, zone, ct); 161 } 162 163 void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key) 164 { 165 ovs_ct_update_key(skb, key, false); 166 } 167 168 int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb) 169 { 170 if (nla_put_u8(skb, OVS_KEY_ATTR_CT_STATE, key->ct.state)) 171 return -EMSGSIZE; 172 173 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 174 nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, key->ct.zone)) 175 return -EMSGSIZE; 176 177 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && 178 nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, key->ct.mark)) 179 return -EMSGSIZE; 180 181 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 182 nla_put(skb, OVS_KEY_ATTR_CT_LABEL, sizeof(key->ct.label), 183 &key->ct.label)) 184 return -EMSGSIZE; 185 186 return 0; 187 } 188 189 static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key, 190 u32 ct_mark, u32 mask) 191 { 192 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) 193 enum ip_conntrack_info ctinfo; 194 struct nf_conn *ct; 195 u32 new_mark; 196 197 198 /* The connection could be invalid, in which case set_mark is no-op. */ 199 ct = nf_ct_get(skb, &ctinfo); 200 if (!ct) 201 return 0; 202 203 new_mark = ct_mark | (ct->mark & ~(mask)); 204 if (ct->mark != new_mark) { 205 ct->mark = new_mark; 206 nf_conntrack_event_cache(IPCT_MARK, ct); 207 key->ct.mark = new_mark; 208 } 209 210 return 0; 211 #else 212 return -ENOTSUPP; 213 #endif 214 } 215 216 static int ovs_ct_set_label(struct sk_buff *skb, struct sw_flow_key *key, 217 const struct ovs_key_ct_label *label, 218 const struct ovs_key_ct_label *mask) 219 { 220 enum ip_conntrack_info ctinfo; 221 struct nf_conn_labels *cl; 222 struct nf_conn *ct; 223 int err; 224 225 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)) 226 return -ENOTSUPP; 227 228 /* The connection could be invalid, in which case set_label is no-op.*/ 229 ct = nf_ct_get(skb, &ctinfo); 230 if (!ct) 231 return 0; 232 233 cl = nf_ct_labels_find(ct); 234 if (!cl) { 235 nf_ct_labels_ext_add(ct); 236 cl = nf_ct_labels_find(ct); 237 } 238 if (!cl || cl->words * sizeof(long) < OVS_CT_LABEL_LEN) 239 return -ENOSPC; 240 241 err = nf_connlabels_replace(ct, (u32 *)label, (u32 *)mask, 242 OVS_CT_LABEL_LEN / sizeof(u32)); 243 if (err) 244 return err; 245 246 ovs_ct_get_label(ct, &key->ct.label); 247 return 0; 248 } 249 250 /* 'skb' should already be pulled to nh_ofs. */ 251 static int ovs_ct_helper(struct sk_buff *skb, u16 proto) 252 { 253 const struct nf_conntrack_helper *helper; 254 const struct nf_conn_help *help; 255 enum ip_conntrack_info ctinfo; 256 unsigned int protoff; 257 struct nf_conn *ct; 258 259 ct = nf_ct_get(skb, &ctinfo); 260 if (!ct || ctinfo == IP_CT_RELATED_REPLY) 261 return NF_ACCEPT; 262 263 help = nfct_help(ct); 264 if (!help) 265 return NF_ACCEPT; 266 267 helper = rcu_dereference(help->helper); 268 if (!helper) 269 return NF_ACCEPT; 270 271 switch (proto) { 272 case NFPROTO_IPV4: 273 protoff = ip_hdrlen(skb); 274 break; 275 case NFPROTO_IPV6: { 276 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 277 __be16 frag_off; 278 279 protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 280 &nexthdr, &frag_off); 281 if (protoff < 0 || (frag_off & htons(~0x7)) != 0) { 282 pr_debug("proto header not found\n"); 283 return NF_ACCEPT; 284 } 285 break; 286 } 287 default: 288 WARN_ONCE(1, "helper invoked on non-IP family!"); 289 return NF_DROP; 290 } 291 292 return helper->help(skb, protoff, ct, ctinfo); 293 } 294 295 static int handle_fragments(struct net *net, struct sw_flow_key *key, 296 u16 zone, struct sk_buff *skb) 297 { 298 struct ovs_skb_cb ovs_cb = *OVS_CB(skb); 299 300 if (key->eth.type == htons(ETH_P_IP)) { 301 enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone; 302 int err; 303 304 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); 305 err = ip_defrag(skb, user); 306 if (err) 307 return err; 308 309 ovs_cb.mru = IPCB(skb)->frag_max_size; 310 } else if (key->eth.type == htons(ETH_P_IPV6)) { 311 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) 312 enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone; 313 struct sk_buff *reasm; 314 315 memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); 316 reasm = nf_ct_frag6_gather(skb, user); 317 if (!reasm) 318 return -EINPROGRESS; 319 320 if (skb == reasm) 321 return -EINVAL; 322 323 key->ip.proto = ipv6_hdr(reasm)->nexthdr; 324 skb_morph(skb, reasm); 325 consume_skb(reasm); 326 ovs_cb.mru = IP6CB(skb)->frag_max_size; 327 #else 328 return -EPFNOSUPPORT; 329 #endif 330 } else { 331 return -EPFNOSUPPORT; 332 } 333 334 key->ip.frag = OVS_FRAG_TYPE_NONE; 335 skb_clear_hash(skb); 336 skb->ignore_df = 1; 337 *OVS_CB(skb) = ovs_cb; 338 339 return 0; 340 } 341 342 static struct nf_conntrack_expect * 343 ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone, 344 u16 proto, const struct sk_buff *skb) 345 { 346 struct nf_conntrack_tuple tuple; 347 348 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, &tuple)) 349 return NULL; 350 return __nf_ct_expect_find(net, zone, &tuple); 351 } 352 353 /* Determine whether skb->nfct is equal to the result of conntrack lookup. */ 354 static bool skb_nfct_cached(const struct net *net, const struct sk_buff *skb, 355 const struct ovs_conntrack_info *info) 356 { 357 enum ip_conntrack_info ctinfo; 358 struct nf_conn *ct; 359 360 ct = nf_ct_get(skb, &ctinfo); 361 if (!ct) 362 return false; 363 if (!net_eq(net, read_pnet(&ct->ct_net))) 364 return false; 365 if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct))) 366 return false; 367 if (info->helper) { 368 struct nf_conn_help *help; 369 370 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER); 371 if (help && rcu_access_pointer(help->helper) != info->helper) 372 return false; 373 } 374 375 return true; 376 } 377 378 static int __ovs_ct_lookup(struct net *net, const struct sw_flow_key *key, 379 const struct ovs_conntrack_info *info, 380 struct sk_buff *skb) 381 { 382 /* If we are recirculating packets to match on conntrack fields and 383 * committing with a separate conntrack action, then we don't need to 384 * actually run the packet through conntrack twice unless it's for a 385 * different zone. 386 */ 387 if (!skb_nfct_cached(net, skb, info)) { 388 struct nf_conn *tmpl = info->ct; 389 390 /* Associate skb with specified zone. */ 391 if (tmpl) { 392 if (skb->nfct) 393 nf_conntrack_put(skb->nfct); 394 nf_conntrack_get(&tmpl->ct_general); 395 skb->nfct = &tmpl->ct_general; 396 skb->nfctinfo = IP_CT_NEW; 397 } 398 399 if (nf_conntrack_in(net, info->family, NF_INET_PRE_ROUTING, 400 skb) != NF_ACCEPT) 401 return -ENOENT; 402 403 if (ovs_ct_helper(skb, info->family) != NF_ACCEPT) { 404 WARN_ONCE(1, "helper rejected packet"); 405 return -EINVAL; 406 } 407 } 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 ovs_ct_update_key(skb, key, true); 433 } 434 435 return 0; 436 } 437 438 /* Lookup connection and confirm if unconfirmed. */ 439 static int ovs_ct_commit(struct net *net, struct sw_flow_key *key, 440 const struct ovs_conntrack_info *info, 441 struct sk_buff *skb) 442 { 443 u8 state; 444 int err; 445 446 state = key->ct.state; 447 if (key->ct.zone == info->zone.id && 448 ((state & OVS_CS_F_TRACKED) && !(state & OVS_CS_F_NEW))) { 449 /* Previous lookup has shown that this connection is already 450 * tracked and committed. Skip committing. 451 */ 452 return 0; 453 } 454 455 err = __ovs_ct_lookup(net, key, info, skb); 456 if (err) 457 return err; 458 if (nf_conntrack_confirm(skb) != NF_ACCEPT) 459 return -EINVAL; 460 461 ovs_ct_update_key(skb, key, true); 462 463 return 0; 464 } 465 466 static bool label_nonzero(const struct ovs_key_ct_label *label) 467 { 468 size_t i; 469 470 for (i = 0; i < sizeof(*label); i++) 471 if (label->ct_label[i]) 472 return true; 473 474 return false; 475 } 476 477 int ovs_ct_execute(struct net *net, struct sk_buff *skb, 478 struct sw_flow_key *key, 479 const struct ovs_conntrack_info *info) 480 { 481 int nh_ofs; 482 int err; 483 484 /* The conntrack module expects to be working at L3. */ 485 nh_ofs = skb_network_offset(skb); 486 skb_pull(skb, nh_ofs); 487 488 if (key->ip.frag != OVS_FRAG_TYPE_NONE) { 489 err = handle_fragments(net, key, info->zone.id, skb); 490 if (err) 491 return err; 492 } 493 494 if (info->flags & OVS_CT_F_COMMIT) 495 err = ovs_ct_commit(net, key, info, skb); 496 else 497 err = ovs_ct_lookup(net, key, info, skb); 498 if (err) 499 goto err; 500 501 if (info->mark.mask) { 502 err = ovs_ct_set_mark(skb, key, info->mark.value, 503 info->mark.mask); 504 if (err) 505 goto err; 506 } 507 if (label_nonzero(&info->label.mask)) 508 err = ovs_ct_set_label(skb, key, &info->label.value, 509 &info->label.mask); 510 err: 511 skb_push(skb, nh_ofs); 512 return err; 513 } 514 515 static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name, 516 const struct sw_flow_key *key, bool log) 517 { 518 struct nf_conntrack_helper *helper; 519 struct nf_conn_help *help; 520 521 helper = nf_conntrack_helper_try_module_get(name, info->family, 522 key->ip.proto); 523 if (!helper) { 524 OVS_NLERR(log, "Unknown helper \"%s\"", name); 525 return -EINVAL; 526 } 527 528 help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL); 529 if (!help) { 530 module_put(helper->me); 531 return -ENOMEM; 532 } 533 534 rcu_assign_pointer(help->helper, helper); 535 info->helper = helper; 536 return 0; 537 } 538 539 static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = { 540 [OVS_CT_ATTR_FLAGS] = { .minlen = sizeof(u32), 541 .maxlen = sizeof(u32) }, 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_LABEL] = { .minlen = sizeof(struct md_label), 547 .maxlen = sizeof(struct md_label) }, 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_FLAGS: 578 info->flags = nla_get_u32(a); 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 info->mark = *mark; 590 break; 591 } 592 #endif 593 #ifdef CONFIG_NF_CONNTRACK_LABELS 594 case OVS_CT_ATTR_LABEL: { 595 struct md_label *label = nla_data(a); 596 597 info->label = *label; 598 break; 599 } 600 #endif 601 case OVS_CT_ATTR_HELPER: 602 *helper = nla_data(a); 603 if (!memchr(*helper, '\0', nla_len(a))) { 604 OVS_NLERR(log, "Invalid conntrack helper"); 605 return -EINVAL; 606 } 607 break; 608 default: 609 OVS_NLERR(log, "Unknown conntrack attr (%d)", 610 type); 611 return -EINVAL; 612 } 613 } 614 615 if (rem > 0) { 616 OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem); 617 return -EINVAL; 618 } 619 620 return 0; 621 } 622 623 bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr) 624 { 625 if (attr == OVS_KEY_ATTR_CT_STATE) 626 return true; 627 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 628 attr == OVS_KEY_ATTR_CT_ZONE) 629 return true; 630 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && 631 attr == OVS_KEY_ATTR_CT_MARK) 632 return true; 633 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 634 attr == OVS_KEY_ATTR_CT_LABEL) { 635 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 636 637 return ovs_net->xt_label; 638 } 639 640 return false; 641 } 642 643 int ovs_ct_copy_action(struct net *net, const struct nlattr *attr, 644 const struct sw_flow_key *key, 645 struct sw_flow_actions **sfa, bool log) 646 { 647 struct ovs_conntrack_info ct_info; 648 const char *helper = NULL; 649 u16 family; 650 int err; 651 652 family = key_to_nfproto(key); 653 if (family == NFPROTO_UNSPEC) { 654 OVS_NLERR(log, "ct family unspecified"); 655 return -EINVAL; 656 } 657 658 memset(&ct_info, 0, sizeof(ct_info)); 659 ct_info.family = family; 660 661 nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID, 662 NF_CT_DEFAULT_ZONE_DIR, 0); 663 664 err = parse_ct(attr, &ct_info, &helper, log); 665 if (err) 666 return err; 667 668 /* Set up template for tracking connections in specific zones. */ 669 ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL); 670 if (!ct_info.ct) { 671 OVS_NLERR(log, "Failed to allocate conntrack template"); 672 return -ENOMEM; 673 } 674 if (helper) { 675 err = ovs_ct_add_helper(&ct_info, helper, key, log); 676 if (err) 677 goto err_free_ct; 678 } 679 680 err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info, 681 sizeof(ct_info), log); 682 if (err) 683 goto err_free_ct; 684 685 __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status); 686 nf_conntrack_get(&ct_info.ct->ct_general); 687 return 0; 688 err_free_ct: 689 nf_conntrack_free(ct_info.ct); 690 return err; 691 } 692 693 int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info, 694 struct sk_buff *skb) 695 { 696 struct nlattr *start; 697 698 start = nla_nest_start(skb, OVS_ACTION_ATTR_CT); 699 if (!start) 700 return -EMSGSIZE; 701 702 if (nla_put_u32(skb, OVS_CT_ATTR_FLAGS, ct_info->flags)) 703 return -EMSGSIZE; 704 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 705 nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id)) 706 return -EMSGSIZE; 707 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && 708 nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark), 709 &ct_info->mark)) 710 return -EMSGSIZE; 711 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 712 nla_put(skb, OVS_CT_ATTR_LABEL, sizeof(ct_info->label), 713 &ct_info->label)) 714 return -EMSGSIZE; 715 if (ct_info->helper) { 716 if (nla_put_string(skb, OVS_CT_ATTR_HELPER, 717 ct_info->helper->name)) 718 return -EMSGSIZE; 719 } 720 721 nla_nest_end(skb, start); 722 723 return 0; 724 } 725 726 void ovs_ct_free_action(const struct nlattr *a) 727 { 728 struct ovs_conntrack_info *ct_info = nla_data(a); 729 730 if (ct_info->helper) 731 module_put(ct_info->helper->me); 732 if (ct_info->ct) 733 nf_ct_put(ct_info->ct); 734 } 735 736 void ovs_ct_init(struct net *net) 737 { 738 unsigned int n_bits = sizeof(struct ovs_key_ct_label) * BITS_PER_BYTE; 739 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 740 741 if (nf_connlabels_get(net, n_bits)) { 742 ovs_net->xt_label = false; 743 OVS_NLERR(true, "Failed to set connlabel length"); 744 } else { 745 ovs_net->xt_label = true; 746 } 747 } 748 749 void ovs_ct_exit(struct net *net) 750 { 751 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 752 753 if (ovs_net->xt_label) 754 nf_connlabels_put(net); 755 } 756