1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2015 Nicira, Inc. 4 */ 5 6 #include <linux/module.h> 7 #include <linux/openvswitch.h> 8 #include <linux/tcp.h> 9 #include <linux/udp.h> 10 #include <linux/sctp.h> 11 #include <linux/static_key.h> 12 #include <linux/string_helpers.h> 13 #include <net/ip.h> 14 #include <net/genetlink.h> 15 #include <net/netfilter/nf_conntrack_core.h> 16 #include <net/netfilter/nf_conntrack_count.h> 17 #include <net/netfilter/nf_conntrack_helper.h> 18 #include <net/netfilter/nf_conntrack_labels.h> 19 #include <net/netfilter/nf_conntrack_seqadj.h> 20 #include <net/netfilter/nf_conntrack_timeout.h> 21 #include <net/netfilter/nf_conntrack_zones.h> 22 #include <net/netfilter/ipv6/nf_defrag_ipv6.h> 23 #include <net/ipv6_frag.h> 24 25 #if IS_ENABLED(CONFIG_NF_NAT) 26 #include <net/netfilter/nf_nat.h> 27 #endif 28 29 #include <net/netfilter/nf_conntrack_act_ct.h> 30 31 #include "datapath.h" 32 #include "drop.h" 33 #include "conntrack.h" 34 #include "flow.h" 35 #include "flow_netlink.h" 36 37 struct ovs_ct_len_tbl { 38 int maxlen; 39 int minlen; 40 }; 41 42 /* Metadata mark for masked write to conntrack mark */ 43 struct md_mark { 44 u32 value; 45 u32 mask; 46 }; 47 48 /* Metadata label for masked write to conntrack label. */ 49 struct md_labels { 50 struct ovs_key_ct_labels value; 51 struct ovs_key_ct_labels mask; 52 }; 53 54 enum ovs_ct_nat { 55 OVS_CT_NAT = 1 << 0, /* NAT for committed connections only. */ 56 OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */ 57 OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */ 58 }; 59 60 /* Conntrack action context for execution. */ 61 struct ovs_conntrack_info { 62 struct nf_conntrack_helper *helper; 63 struct nf_conntrack_zone zone; 64 struct nf_conn *ct; 65 u8 commit : 1; 66 u8 nat : 3; /* enum ovs_ct_nat */ 67 u8 force : 1; 68 u8 have_eventmask : 1; 69 u16 family; 70 u32 eventmask; /* Mask of 1 << IPCT_*. */ 71 struct md_mark mark; 72 struct md_labels labels; 73 char timeout[CTNL_TIMEOUT_NAME_MAX]; 74 struct nf_ct_timeout *nf_ct_timeout; 75 #if IS_ENABLED(CONFIG_NF_NAT) 76 struct nf_nat_range2 range; /* Only present for SRC NAT and DST NAT. */ 77 #endif 78 }; 79 80 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 81 #define OVS_CT_LIMIT_UNLIMITED 0 82 #define OVS_CT_LIMIT_DEFAULT OVS_CT_LIMIT_UNLIMITED 83 #define CT_LIMIT_HASH_BUCKETS 512 84 static DEFINE_STATIC_KEY_FALSE(ovs_ct_limit_enabled); 85 86 struct ovs_ct_limit { 87 /* Elements in ovs_ct_limit_info->limits hash table */ 88 struct hlist_node hlist_node; 89 struct rcu_head rcu; 90 u16 zone; 91 u32 limit; 92 }; 93 94 struct ovs_ct_limit_info { 95 u32 default_limit; 96 struct hlist_head *limits; 97 struct nf_conncount_data *data; 98 }; 99 100 static const struct nla_policy ct_limit_policy[OVS_CT_LIMIT_ATTR_MAX + 1] = { 101 [OVS_CT_LIMIT_ATTR_ZONE_LIMIT] = { .type = NLA_NESTED, }, 102 }; 103 #endif 104 105 static bool labels_nonzero(const struct ovs_key_ct_labels *labels); 106 107 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info); 108 109 static u16 key_to_nfproto(const struct sw_flow_key *key) 110 { 111 switch (ntohs(key->eth.type)) { 112 case ETH_P_IP: 113 return NFPROTO_IPV4; 114 case ETH_P_IPV6: 115 return NFPROTO_IPV6; 116 default: 117 return NFPROTO_UNSPEC; 118 } 119 } 120 121 /* Map SKB connection state into the values used by flow definition. */ 122 static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo) 123 { 124 u8 ct_state = OVS_CS_F_TRACKED; 125 126 switch (ctinfo) { 127 case IP_CT_ESTABLISHED_REPLY: 128 case IP_CT_RELATED_REPLY: 129 ct_state |= OVS_CS_F_REPLY_DIR; 130 break; 131 default: 132 break; 133 } 134 135 switch (ctinfo) { 136 case IP_CT_ESTABLISHED: 137 case IP_CT_ESTABLISHED_REPLY: 138 ct_state |= OVS_CS_F_ESTABLISHED; 139 break; 140 case IP_CT_RELATED: 141 case IP_CT_RELATED_REPLY: 142 ct_state |= OVS_CS_F_RELATED; 143 break; 144 case IP_CT_NEW: 145 ct_state |= OVS_CS_F_NEW; 146 break; 147 default: 148 break; 149 } 150 151 return ct_state; 152 } 153 154 static u32 ovs_ct_get_mark(const struct nf_conn *ct) 155 { 156 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) 157 return ct ? READ_ONCE(ct->mark) : 0; 158 #else 159 return 0; 160 #endif 161 } 162 163 /* Guard against conntrack labels max size shrinking below 128 bits. */ 164 #if NF_CT_LABELS_MAX_SIZE < 16 165 #error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes 166 #endif 167 168 static void ovs_ct_get_labels(const struct nf_conn *ct, 169 struct ovs_key_ct_labels *labels) 170 { 171 struct nf_conn_labels *cl = NULL; 172 173 if (ct) { 174 if (ct->master && !nf_ct_is_confirmed(ct)) 175 ct = ct->master; 176 cl = nf_ct_labels_find(ct); 177 } 178 if (cl) 179 memcpy(labels, cl->bits, OVS_CT_LABELS_LEN); 180 else 181 memset(labels, 0, OVS_CT_LABELS_LEN); 182 } 183 184 static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key, 185 const struct nf_conntrack_tuple *orig, 186 u8 icmp_proto) 187 { 188 key->ct_orig_proto = orig->dst.protonum; 189 if (orig->dst.protonum == icmp_proto) { 190 key->ct.orig_tp.src = htons(orig->dst.u.icmp.type); 191 key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code); 192 } else { 193 key->ct.orig_tp.src = orig->src.u.all; 194 key->ct.orig_tp.dst = orig->dst.u.all; 195 } 196 } 197 198 static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state, 199 const struct nf_conntrack_zone *zone, 200 const struct nf_conn *ct) 201 { 202 key->ct_state = state; 203 key->ct_zone = zone->id; 204 key->ct.mark = ovs_ct_get_mark(ct); 205 ovs_ct_get_labels(ct, &key->ct.labels); 206 207 if (ct) { 208 const struct nf_conntrack_tuple *orig; 209 210 /* Use the master if we have one. */ 211 if (ct->master) 212 ct = ct->master; 213 orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; 214 215 /* IP version must match with the master connection. */ 216 if (key->eth.type == htons(ETH_P_IP) && 217 nf_ct_l3num(ct) == NFPROTO_IPV4) { 218 key->ipv4.ct_orig.src = orig->src.u3.ip; 219 key->ipv4.ct_orig.dst = orig->dst.u3.ip; 220 __ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP); 221 return; 222 } else if (key->eth.type == htons(ETH_P_IPV6) && 223 !sw_flow_key_is_nd(key) && 224 nf_ct_l3num(ct) == NFPROTO_IPV6) { 225 key->ipv6.ct_orig.src = orig->src.u3.in6; 226 key->ipv6.ct_orig.dst = orig->dst.u3.in6; 227 __ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP); 228 return; 229 } 230 } 231 /* Clear 'ct_orig_proto' to mark the non-existence of conntrack 232 * original direction key fields. 233 */ 234 key->ct_orig_proto = 0; 235 } 236 237 /* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has 238 * previously sent the packet to conntrack via the ct action. If 239 * 'keep_nat_flags' is true, the existing NAT flags retained, else they are 240 * initialized from the connection status. 241 */ 242 static void ovs_ct_update_key(const struct sk_buff *skb, 243 const struct ovs_conntrack_info *info, 244 struct sw_flow_key *key, bool post_ct, 245 bool keep_nat_flags) 246 { 247 const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt; 248 enum ip_conntrack_info ctinfo; 249 struct nf_conn *ct; 250 u8 state = 0; 251 252 ct = nf_ct_get(skb, &ctinfo); 253 if (ct) { 254 state = ovs_ct_get_state(ctinfo); 255 /* All unconfirmed entries are NEW connections. */ 256 if (!nf_ct_is_confirmed(ct)) 257 state |= OVS_CS_F_NEW; 258 /* OVS persists the related flag for the duration of the 259 * connection. 260 */ 261 if (ct->master) 262 state |= OVS_CS_F_RELATED; 263 if (keep_nat_flags) { 264 state |= key->ct_state & OVS_CS_F_NAT_MASK; 265 } else { 266 if (ct->status & IPS_SRC_NAT) 267 state |= OVS_CS_F_SRC_NAT; 268 if (ct->status & IPS_DST_NAT) 269 state |= OVS_CS_F_DST_NAT; 270 } 271 zone = nf_ct_zone(ct); 272 } else if (post_ct) { 273 state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID; 274 if (info) 275 zone = &info->zone; 276 } 277 __ovs_ct_update_key(key, state, zone, ct); 278 } 279 280 /* This is called to initialize CT key fields possibly coming in from the local 281 * stack. 282 */ 283 void ovs_ct_fill_key(const struct sk_buff *skb, 284 struct sw_flow_key *key, 285 bool post_ct) 286 { 287 ovs_ct_update_key(skb, NULL, key, post_ct, false); 288 } 289 290 int ovs_ct_put_key(const struct sw_flow_key *swkey, 291 const struct sw_flow_key *output, struct sk_buff *skb) 292 { 293 if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state)) 294 return -EMSGSIZE; 295 296 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 297 nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone)) 298 return -EMSGSIZE; 299 300 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && 301 nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark)) 302 return -EMSGSIZE; 303 304 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 305 nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels), 306 &output->ct.labels)) 307 return -EMSGSIZE; 308 309 if (swkey->ct_orig_proto) { 310 if (swkey->eth.type == htons(ETH_P_IP)) { 311 struct ovs_key_ct_tuple_ipv4 orig; 312 313 memset(&orig, 0, sizeof(orig)); 314 orig.ipv4_src = output->ipv4.ct_orig.src; 315 orig.ipv4_dst = output->ipv4.ct_orig.dst; 316 orig.src_port = output->ct.orig_tp.src; 317 orig.dst_port = output->ct.orig_tp.dst; 318 orig.ipv4_proto = output->ct_orig_proto; 319 320 if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4, 321 sizeof(orig), &orig)) 322 return -EMSGSIZE; 323 } else if (swkey->eth.type == htons(ETH_P_IPV6)) { 324 struct ovs_key_ct_tuple_ipv6 orig; 325 326 memset(&orig, 0, sizeof(orig)); 327 memcpy(orig.ipv6_src, output->ipv6.ct_orig.src.s6_addr32, 328 sizeof(orig.ipv6_src)); 329 memcpy(orig.ipv6_dst, output->ipv6.ct_orig.dst.s6_addr32, 330 sizeof(orig.ipv6_dst)); 331 orig.src_port = output->ct.orig_tp.src; 332 orig.dst_port = output->ct.orig_tp.dst; 333 orig.ipv6_proto = output->ct_orig_proto; 334 335 if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6, 336 sizeof(orig), &orig)) 337 return -EMSGSIZE; 338 } 339 } 340 341 return 0; 342 } 343 344 static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key, 345 u32 ct_mark, u32 mask) 346 { 347 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) 348 u32 new_mark; 349 350 new_mark = ct_mark | (READ_ONCE(ct->mark) & ~(mask)); 351 if (READ_ONCE(ct->mark) != new_mark) { 352 WRITE_ONCE(ct->mark, new_mark); 353 if (nf_ct_is_confirmed(ct)) 354 nf_conntrack_event_cache(IPCT_MARK, ct); 355 key->ct.mark = new_mark; 356 } 357 358 return 0; 359 #else 360 return -ENOTSUPP; 361 #endif 362 } 363 364 static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct) 365 { 366 struct nf_conn_labels *cl; 367 368 cl = nf_ct_labels_find(ct); 369 if (!cl) { 370 nf_ct_labels_ext_add(ct); 371 cl = nf_ct_labels_find(ct); 372 } 373 374 return cl; 375 } 376 377 /* Initialize labels for a new, yet to be committed conntrack entry. Note that 378 * since the new connection is not yet confirmed, and thus no-one else has 379 * access to it's labels, we simply write them over. 380 */ 381 static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key, 382 const struct ovs_key_ct_labels *labels, 383 const struct ovs_key_ct_labels *mask) 384 { 385 struct nf_conn_labels *cl, *master_cl; 386 bool have_mask = labels_nonzero(mask); 387 388 /* Inherit master's labels to the related connection? */ 389 master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL; 390 391 if (!master_cl && !have_mask) 392 return 0; /* Nothing to do. */ 393 394 cl = ovs_ct_get_conn_labels(ct); 395 if (!cl) 396 return -ENOSPC; 397 398 /* Inherit the master's labels, if any. */ 399 if (master_cl) 400 *cl = *master_cl; 401 402 if (have_mask) { 403 u32 *dst = (u32 *)cl->bits; 404 int i; 405 406 for (i = 0; i < OVS_CT_LABELS_LEN_32; i++) 407 dst[i] = (dst[i] & ~mask->ct_labels_32[i]) | 408 (labels->ct_labels_32[i] 409 & mask->ct_labels_32[i]); 410 } 411 412 /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the 413 * IPCT_LABEL bit is set in the event cache. 414 */ 415 nf_conntrack_event_cache(IPCT_LABEL, ct); 416 417 memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); 418 419 return 0; 420 } 421 422 static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key, 423 const struct ovs_key_ct_labels *labels, 424 const struct ovs_key_ct_labels *mask) 425 { 426 struct nf_conn_labels *cl; 427 int err; 428 429 cl = ovs_ct_get_conn_labels(ct); 430 if (!cl) 431 return -ENOSPC; 432 433 err = nf_connlabels_replace(ct, labels->ct_labels_32, 434 mask->ct_labels_32, 435 OVS_CT_LABELS_LEN_32); 436 if (err) 437 return err; 438 439 memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); 440 441 return 0; 442 } 443 444 static int ovs_ct_handle_fragments(struct net *net, struct sw_flow_key *key, 445 u16 zone, int family, struct sk_buff *skb) 446 { 447 struct ovs_skb_cb ovs_cb = *OVS_CB(skb); 448 int err; 449 450 err = nf_ct_handle_fragments(net, skb, zone, family, &key->ip.proto, &ovs_cb.mru); 451 if (err) 452 return err; 453 454 /* The key extracted from the fragment that completed this datagram 455 * likely didn't have an L4 header, so regenerate it. 456 */ 457 ovs_flow_key_update_l3l4(skb, key); 458 key->ip.frag = OVS_FRAG_TYPE_NONE; 459 *OVS_CB(skb) = ovs_cb; 460 461 return 0; 462 } 463 464 /* This replicates logic from nf_conntrack_core.c that is not exported. */ 465 static enum ip_conntrack_info 466 ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h) 467 { 468 const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); 469 470 if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) 471 return IP_CT_ESTABLISHED_REPLY; 472 /* Once we've had two way comms, always ESTABLISHED. */ 473 if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) 474 return IP_CT_ESTABLISHED; 475 if (test_bit(IPS_EXPECTED_BIT, &ct->status)) 476 return IP_CT_RELATED; 477 return IP_CT_NEW; 478 } 479 480 /* Find an existing connection which this packet belongs to without 481 * re-attributing statistics or modifying the connection state. This allows an 482 * skb->_nfct lost due to an upcall to be recovered during actions execution. 483 * 484 * Must be called with rcu_read_lock. 485 * 486 * On success, populates skb->_nfct and returns the connection. Returns NULL 487 * if there is no existing entry. 488 */ 489 static struct nf_conn * 490 ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone, 491 u8 l3num, struct sk_buff *skb, bool natted) 492 { 493 struct nf_conntrack_tuple tuple; 494 struct nf_conntrack_tuple_hash *h; 495 struct nf_conn *ct; 496 497 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), l3num, 498 net, &tuple)) { 499 pr_debug("ovs_ct_find_existing: Can't get tuple\n"); 500 return NULL; 501 } 502 503 /* Must invert the tuple if skb has been transformed by NAT. */ 504 if (natted) { 505 struct nf_conntrack_tuple inverse; 506 507 if (!nf_ct_invert_tuple(&inverse, &tuple)) { 508 pr_debug("ovs_ct_find_existing: Inversion failed!\n"); 509 return NULL; 510 } 511 tuple = inverse; 512 } 513 514 /* look for tuple match */ 515 h = nf_conntrack_find_get(net, zone, &tuple); 516 if (!h) 517 return NULL; /* Not found. */ 518 519 ct = nf_ct_tuplehash_to_ctrack(h); 520 521 /* Inverted packet tuple matches the reverse direction conntrack tuple, 522 * select the other tuplehash to get the right 'ctinfo' bits for this 523 * packet. 524 */ 525 if (natted) 526 h = &ct->tuplehash[!h->tuple.dst.dir]; 527 528 nf_ct_set(skb, ct, ovs_ct_get_info(h)); 529 return ct; 530 } 531 532 static 533 struct nf_conn *ovs_ct_executed(struct net *net, 534 const struct sw_flow_key *key, 535 const struct ovs_conntrack_info *info, 536 struct sk_buff *skb, 537 bool *ct_executed) 538 { 539 struct nf_conn *ct = NULL; 540 541 /* If no ct, check if we have evidence that an existing conntrack entry 542 * might be found for this skb. This happens when we lose a skb->_nfct 543 * due to an upcall, or if the direction is being forced. If the 544 * connection was not confirmed, it is not cached and needs to be run 545 * through conntrack again. 546 */ 547 *ct_executed = (key->ct_state & OVS_CS_F_TRACKED) && 548 !(key->ct_state & OVS_CS_F_INVALID) && 549 (key->ct_zone == info->zone.id); 550 551 if (*ct_executed || (!key->ct_state && info->force)) { 552 ct = ovs_ct_find_existing(net, &info->zone, info->family, skb, 553 !!(key->ct_state & 554 OVS_CS_F_NAT_MASK)); 555 } 556 557 return ct; 558 } 559 560 /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */ 561 static bool skb_nfct_cached(struct net *net, 562 const struct sw_flow_key *key, 563 const struct ovs_conntrack_info *info, 564 struct sk_buff *skb) 565 { 566 enum ip_conntrack_info ctinfo; 567 struct nf_conn *ct; 568 bool ct_executed = true; 569 570 ct = nf_ct_get(skb, &ctinfo); 571 if (!ct) 572 ct = ovs_ct_executed(net, key, info, skb, &ct_executed); 573 574 if (ct) 575 nf_ct_get(skb, &ctinfo); 576 else 577 return false; 578 579 if (!net_eq(net, read_pnet(&ct->ct_net))) 580 return false; 581 if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct))) 582 return false; 583 if (info->helper) { 584 struct nf_conn_help *help; 585 586 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER); 587 if (help && rcu_access_pointer(help->helper) != info->helper) 588 return false; 589 } 590 if (info->nf_ct_timeout) { 591 struct nf_conn_timeout *timeout_ext; 592 593 timeout_ext = nf_ct_timeout_find(ct); 594 if (!timeout_ext || info->nf_ct_timeout != 595 rcu_dereference(timeout_ext->timeout)) 596 return false; 597 } 598 /* Force conntrack entry direction to the current packet? */ 599 if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) { 600 /* Delete the conntrack entry if confirmed, else just release 601 * the reference. 602 */ 603 if (nf_ct_is_confirmed(ct)) 604 nf_ct_delete(ct, 0, 0); 605 606 nf_ct_put(ct); 607 nf_ct_set(skb, NULL, 0); 608 return false; 609 } 610 611 return ct_executed; 612 } 613 614 #if IS_ENABLED(CONFIG_NF_NAT) 615 static void ovs_nat_update_key(struct sw_flow_key *key, 616 const struct sk_buff *skb, 617 enum nf_nat_manip_type maniptype) 618 { 619 if (maniptype == NF_NAT_MANIP_SRC) { 620 __be16 src; 621 622 key->ct_state |= OVS_CS_F_SRC_NAT; 623 if (key->eth.type == htons(ETH_P_IP)) 624 key->ipv4.addr.src = ip_hdr(skb)->saddr; 625 else if (key->eth.type == htons(ETH_P_IPV6)) 626 memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr, 627 sizeof(key->ipv6.addr.src)); 628 else 629 return; 630 631 if (key->ip.proto == IPPROTO_UDP) 632 src = udp_hdr(skb)->source; 633 else if (key->ip.proto == IPPROTO_TCP) 634 src = tcp_hdr(skb)->source; 635 else if (key->ip.proto == IPPROTO_SCTP) 636 src = sctp_hdr(skb)->source; 637 else 638 return; 639 640 key->tp.src = src; 641 } else { 642 __be16 dst; 643 644 key->ct_state |= OVS_CS_F_DST_NAT; 645 if (key->eth.type == htons(ETH_P_IP)) 646 key->ipv4.addr.dst = ip_hdr(skb)->daddr; 647 else if (key->eth.type == htons(ETH_P_IPV6)) 648 memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr, 649 sizeof(key->ipv6.addr.dst)); 650 else 651 return; 652 653 if (key->ip.proto == IPPROTO_UDP) 654 dst = udp_hdr(skb)->dest; 655 else if (key->ip.proto == IPPROTO_TCP) 656 dst = tcp_hdr(skb)->dest; 657 else if (key->ip.proto == IPPROTO_SCTP) 658 dst = sctp_hdr(skb)->dest; 659 else 660 return; 661 662 key->tp.dst = dst; 663 } 664 } 665 666 /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */ 667 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, 668 const struct ovs_conntrack_info *info, 669 struct sk_buff *skb, struct nf_conn *ct, 670 enum ip_conntrack_info ctinfo) 671 { 672 int err, action = 0; 673 674 if (!(info->nat & OVS_CT_NAT)) 675 return NF_ACCEPT; 676 if (info->nat & OVS_CT_SRC_NAT) 677 action |= BIT(NF_NAT_MANIP_SRC); 678 if (info->nat & OVS_CT_DST_NAT) 679 action |= BIT(NF_NAT_MANIP_DST); 680 681 err = nf_ct_nat(skb, ct, ctinfo, &action, &info->range, info->commit); 682 if (err != NF_ACCEPT) 683 return err; 684 685 if (action & BIT(NF_NAT_MANIP_SRC)) 686 ovs_nat_update_key(key, skb, NF_NAT_MANIP_SRC); 687 if (action & BIT(NF_NAT_MANIP_DST)) 688 ovs_nat_update_key(key, skb, NF_NAT_MANIP_DST); 689 690 return err; 691 } 692 #else /* !CONFIG_NF_NAT */ 693 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, 694 const struct ovs_conntrack_info *info, 695 struct sk_buff *skb, struct nf_conn *ct, 696 enum ip_conntrack_info ctinfo) 697 { 698 return NF_ACCEPT; 699 } 700 #endif 701 702 static int verdict_to_errno(unsigned int verdict) 703 { 704 switch (verdict & NF_VERDICT_MASK) { 705 case NF_ACCEPT: 706 return 0; 707 case NF_DROP: 708 return -EINVAL; 709 case NF_STOLEN: 710 return -EINPROGRESS; 711 default: 712 break; 713 } 714 715 return -EINVAL; 716 } 717 718 /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if 719 * not done already. Update key with new CT state after passing the packet 720 * through conntrack. 721 * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be 722 * set to NULL and 0 will be returned. 723 */ 724 static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key, 725 const struct ovs_conntrack_info *info, 726 struct sk_buff *skb) 727 { 728 /* If we are recirculating packets to match on conntrack fields and 729 * committing with a separate conntrack action, then we don't need to 730 * actually run the packet through conntrack twice unless it's for a 731 * different zone. 732 */ 733 bool cached = skb_nfct_cached(net, key, info, skb); 734 enum ip_conntrack_info ctinfo; 735 struct nf_conn *ct; 736 737 if (!cached) { 738 struct nf_hook_state state = { 739 .hook = NF_INET_PRE_ROUTING, 740 .pf = info->family, 741 .net = net, 742 }; 743 struct nf_conn *tmpl = info->ct; 744 int err; 745 746 /* Associate skb with specified zone. */ 747 if (tmpl) { 748 ct = nf_ct_get(skb, &ctinfo); 749 nf_ct_put(ct); 750 nf_conntrack_get(&tmpl->ct_general); 751 nf_ct_set(skb, tmpl, IP_CT_NEW); 752 } 753 754 err = nf_conntrack_in(skb, &state); 755 if (err != NF_ACCEPT) 756 return verdict_to_errno(err); 757 758 /* Clear CT state NAT flags to mark that we have not yet done 759 * NAT after the nf_conntrack_in() call. We can actually clear 760 * the whole state, as it will be re-initialized below. 761 */ 762 key->ct_state = 0; 763 764 /* Update the key, but keep the NAT flags. */ 765 ovs_ct_update_key(skb, info, key, true, true); 766 } 767 768 ct = nf_ct_get(skb, &ctinfo); 769 if (ct) { 770 bool add_helper = false; 771 772 /* Packets starting a new connection must be NATted before the 773 * helper, so that the helper knows about the NAT. We enforce 774 * this by delaying both NAT and helper calls for unconfirmed 775 * connections until the committing CT action. For later 776 * packets NAT and Helper may be called in either order. 777 * 778 * NAT will be done only if the CT action has NAT, and only 779 * once per packet (per zone), as guarded by the NAT bits in 780 * the key->ct_state. 781 */ 782 if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) && 783 (nf_ct_is_confirmed(ct) || info->commit)) { 784 int err = ovs_ct_nat(net, key, info, skb, ct, ctinfo); 785 786 err = verdict_to_errno(err); 787 if (err) 788 return err; 789 } 790 791 /* Userspace may decide to perform a ct lookup without a helper 792 * specified followed by a (recirculate and) commit with one, 793 * or attach a helper in a later commit. Therefore, for 794 * connections which we will commit, we may need to attach 795 * the helper here. 796 */ 797 if (!nf_ct_is_confirmed(ct) && info->commit && 798 info->helper && !nfct_help(ct)) { 799 int err = __nf_ct_try_assign_helper(ct, info->ct, 800 GFP_ATOMIC); 801 if (err) 802 return err; 803 add_helper = true; 804 805 /* helper installed, add seqadj if NAT is required */ 806 if (info->nat && !nfct_seqadj(ct)) { 807 if (!nfct_seqadj_ext_add(ct)) 808 return -EINVAL; 809 } 810 } 811 812 /* Call the helper only if: 813 * - nf_conntrack_in() was executed above ("!cached") or a 814 * helper was just attached ("add_helper") for a confirmed 815 * connection, or 816 * - When committing an unconfirmed connection. 817 */ 818 if ((nf_ct_is_confirmed(ct) ? !cached || add_helper : 819 info->commit)) { 820 int err = nf_ct_helper(skb, ct, ctinfo, info->family); 821 822 err = verdict_to_errno(err); 823 if (err) 824 return err; 825 } 826 827 if (nf_ct_protonum(ct) == IPPROTO_TCP && 828 nf_ct_is_confirmed(ct) && nf_conntrack_tcp_established(ct)) { 829 /* Be liberal for tcp packets so that out-of-window 830 * packets are not marked invalid. 831 */ 832 nf_ct_set_tcp_be_liberal(ct); 833 } 834 835 nf_conn_act_ct_ext_fill(skb, ct, ctinfo); 836 } 837 838 return 0; 839 } 840 841 /* Lookup connection and read fields into key. */ 842 static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key, 843 const struct ovs_conntrack_info *info, 844 struct sk_buff *skb) 845 { 846 struct nf_conn *ct; 847 int err; 848 849 err = __ovs_ct_lookup(net, key, info, skb); 850 if (err) 851 return err; 852 853 ct = (struct nf_conn *)skb_nfct(skb); 854 if (ct) 855 nf_ct_deliver_cached_events(ct); 856 857 return 0; 858 } 859 860 static bool labels_nonzero(const struct ovs_key_ct_labels *labels) 861 { 862 size_t i; 863 864 for (i = 0; i < OVS_CT_LABELS_LEN_32; i++) 865 if (labels->ct_labels_32[i]) 866 return true; 867 868 return false; 869 } 870 871 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 872 static struct hlist_head *ct_limit_hash_bucket( 873 const struct ovs_ct_limit_info *info, u16 zone) 874 { 875 return &info->limits[zone & (CT_LIMIT_HASH_BUCKETS - 1)]; 876 } 877 878 /* Call with ovs_mutex */ 879 static void ct_limit_set(const struct ovs_ct_limit_info *info, 880 struct ovs_ct_limit *new_ct_limit) 881 { 882 struct ovs_ct_limit *ct_limit; 883 struct hlist_head *head; 884 885 head = ct_limit_hash_bucket(info, new_ct_limit->zone); 886 hlist_for_each_entry_rcu(ct_limit, head, hlist_node, 887 lockdep_ovsl_is_held()) { 888 if (ct_limit->zone == new_ct_limit->zone) { 889 hlist_replace_rcu(&ct_limit->hlist_node, 890 &new_ct_limit->hlist_node); 891 kfree_rcu(ct_limit, rcu); 892 return; 893 } 894 } 895 896 hlist_add_head_rcu(&new_ct_limit->hlist_node, head); 897 } 898 899 /* Call with ovs_mutex */ 900 static void ct_limit_del(const struct ovs_ct_limit_info *info, u16 zone) 901 { 902 struct ovs_ct_limit *ct_limit; 903 struct hlist_head *head; 904 struct hlist_node *n; 905 906 head = ct_limit_hash_bucket(info, zone); 907 hlist_for_each_entry_safe(ct_limit, n, head, hlist_node) { 908 if (ct_limit->zone == zone) { 909 hlist_del_rcu(&ct_limit->hlist_node); 910 kfree_rcu(ct_limit, rcu); 911 return; 912 } 913 } 914 } 915 916 /* Call with RCU read lock */ 917 static u32 ct_limit_get(const struct ovs_ct_limit_info *info, u16 zone) 918 { 919 struct ovs_ct_limit *ct_limit; 920 struct hlist_head *head; 921 922 head = ct_limit_hash_bucket(info, zone); 923 hlist_for_each_entry_rcu(ct_limit, head, hlist_node) { 924 if (ct_limit->zone == zone) 925 return ct_limit->limit; 926 } 927 928 return info->default_limit; 929 } 930 931 static int ovs_ct_check_limit(struct net *net, 932 const struct sk_buff *skb, 933 const struct ovs_conntrack_info *info) 934 { 935 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 936 const struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info; 937 u32 per_zone_limit, connections; 938 u32 conncount_key; 939 940 conncount_key = info->zone.id; 941 942 per_zone_limit = ct_limit_get(ct_limit_info, info->zone.id); 943 if (per_zone_limit == OVS_CT_LIMIT_UNLIMITED) 944 return 0; 945 946 connections = nf_conncount_count_skb(net, skb, info->family, 947 ct_limit_info->data, 948 &conncount_key); 949 if (connections > per_zone_limit) 950 return -ENOMEM; 951 952 return 0; 953 } 954 #endif 955 956 /* Lookup connection and confirm if unconfirmed. */ 957 static int ovs_ct_commit(struct net *net, struct sw_flow_key *key, 958 const struct ovs_conntrack_info *info, 959 struct sk_buff *skb) 960 { 961 enum ip_conntrack_info ctinfo; 962 struct nf_conn *ct; 963 int err; 964 965 err = __ovs_ct_lookup(net, key, info, skb); 966 if (err) 967 return err; 968 969 /* The connection could be invalid, in which case this is a no-op.*/ 970 ct = nf_ct_get(skb, &ctinfo); 971 if (!ct) 972 return 0; 973 974 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 975 if (static_branch_unlikely(&ovs_ct_limit_enabled)) { 976 if (!nf_ct_is_confirmed(ct)) { 977 err = ovs_ct_check_limit(net, skb, info); 978 if (err) { 979 net_warn_ratelimited("openvswitch: zone: %u " 980 "exceeds conntrack limit\n", 981 info->zone.id); 982 return err; 983 } 984 } 985 } 986 #endif 987 988 /* Set the conntrack event mask if given. NEW and DELETE events have 989 * their own groups, but the NFNLGRP_CONNTRACK_UPDATE group listener 990 * typically would receive many kinds of updates. Setting the event 991 * mask allows those events to be filtered. The set event mask will 992 * remain in effect for the lifetime of the connection unless changed 993 * by a further CT action with both the commit flag and the eventmask 994 * option. */ 995 if (info->have_eventmask) { 996 struct nf_conntrack_ecache *cache = nf_ct_ecache_find(ct); 997 998 if (cache) 999 cache->ctmask = info->eventmask; 1000 } 1001 1002 /* Apply changes before confirming the connection so that the initial 1003 * conntrack NEW netlink event carries the values given in the CT 1004 * action. 1005 */ 1006 if (info->mark.mask) { 1007 err = ovs_ct_set_mark(ct, key, info->mark.value, 1008 info->mark.mask); 1009 if (err) 1010 return err; 1011 } 1012 if (!nf_ct_is_confirmed(ct)) { 1013 err = ovs_ct_init_labels(ct, key, &info->labels.value, 1014 &info->labels.mask); 1015 if (err) 1016 return err; 1017 1018 nf_conn_act_ct_ext_add(skb, ct, ctinfo); 1019 } else if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 1020 labels_nonzero(&info->labels.mask)) { 1021 err = ovs_ct_set_labels(ct, key, &info->labels.value, 1022 &info->labels.mask); 1023 if (err) 1024 return err; 1025 } 1026 /* This will take care of sending queued events even if the connection 1027 * is already confirmed. 1028 */ 1029 err = nf_conntrack_confirm(skb); 1030 1031 return verdict_to_errno(err); 1032 } 1033 1034 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero 1035 * value if 'skb' is freed. 1036 */ 1037 int ovs_ct_execute(struct net *net, struct sk_buff *skb, 1038 struct sw_flow_key *key, 1039 const struct ovs_conntrack_info *info) 1040 { 1041 int nh_ofs; 1042 int err; 1043 1044 /* The conntrack module expects to be working at L3. */ 1045 nh_ofs = skb_network_offset(skb); 1046 skb_pull_rcsum(skb, nh_ofs); 1047 1048 err = nf_ct_skb_network_trim(skb, info->family); 1049 if (err) { 1050 kfree_skb(skb); 1051 return err; 1052 } 1053 1054 if (key->ip.frag != OVS_FRAG_TYPE_NONE) { 1055 err = ovs_ct_handle_fragments(net, key, info->zone.id, 1056 info->family, skb); 1057 if (err) 1058 return err; 1059 } 1060 1061 if (info->commit) 1062 err = ovs_ct_commit(net, key, info, skb); 1063 else 1064 err = ovs_ct_lookup(net, key, info, skb); 1065 1066 /* conntrack core returned NF_STOLEN */ 1067 if (err == -EINPROGRESS) 1068 return err; 1069 1070 skb_push_rcsum(skb, nh_ofs); 1071 if (err) 1072 ovs_kfree_skb_reason(skb, OVS_DROP_CONNTRACK); 1073 return err; 1074 } 1075 1076 int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key) 1077 { 1078 enum ip_conntrack_info ctinfo; 1079 struct nf_conn *ct; 1080 1081 ct = nf_ct_get(skb, &ctinfo); 1082 1083 nf_ct_put(ct); 1084 nf_ct_set(skb, NULL, IP_CT_UNTRACKED); 1085 1086 if (key) 1087 ovs_ct_fill_key(skb, key, false); 1088 1089 return 0; 1090 } 1091 1092 #if IS_ENABLED(CONFIG_NF_NAT) 1093 static int parse_nat(const struct nlattr *attr, 1094 struct ovs_conntrack_info *info, bool log) 1095 { 1096 struct nlattr *a; 1097 int rem; 1098 bool have_ip_max = false; 1099 bool have_proto_max = false; 1100 bool ip_vers = (info->family == NFPROTO_IPV6); 1101 1102 nla_for_each_nested(a, attr, rem) { 1103 static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = { 1104 [OVS_NAT_ATTR_SRC] = {0, 0}, 1105 [OVS_NAT_ATTR_DST] = {0, 0}, 1106 [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr), 1107 sizeof(struct in6_addr)}, 1108 [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr), 1109 sizeof(struct in6_addr)}, 1110 [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)}, 1111 [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)}, 1112 [OVS_NAT_ATTR_PERSISTENT] = {0, 0}, 1113 [OVS_NAT_ATTR_PROTO_HASH] = {0, 0}, 1114 [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0}, 1115 }; 1116 int type = nla_type(a); 1117 1118 if (type > OVS_NAT_ATTR_MAX) { 1119 OVS_NLERR(log, "Unknown NAT attribute (type=%d, max=%d)", 1120 type, OVS_NAT_ATTR_MAX); 1121 return -EINVAL; 1122 } 1123 1124 if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) { 1125 OVS_NLERR(log, "NAT attribute type %d has unexpected length (%d != %d)", 1126 type, nla_len(a), 1127 ovs_nat_attr_lens[type][ip_vers]); 1128 return -EINVAL; 1129 } 1130 1131 switch (type) { 1132 case OVS_NAT_ATTR_SRC: 1133 case OVS_NAT_ATTR_DST: 1134 if (info->nat) { 1135 OVS_NLERR(log, "Only one type of NAT may be specified"); 1136 return -ERANGE; 1137 } 1138 info->nat |= OVS_CT_NAT; 1139 info->nat |= ((type == OVS_NAT_ATTR_SRC) 1140 ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT); 1141 break; 1142 1143 case OVS_NAT_ATTR_IP_MIN: 1144 nla_memcpy(&info->range.min_addr, a, 1145 sizeof(info->range.min_addr)); 1146 info->range.flags |= NF_NAT_RANGE_MAP_IPS; 1147 break; 1148 1149 case OVS_NAT_ATTR_IP_MAX: 1150 have_ip_max = true; 1151 nla_memcpy(&info->range.max_addr, a, 1152 sizeof(info->range.max_addr)); 1153 info->range.flags |= NF_NAT_RANGE_MAP_IPS; 1154 break; 1155 1156 case OVS_NAT_ATTR_PROTO_MIN: 1157 info->range.min_proto.all = htons(nla_get_u16(a)); 1158 info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; 1159 break; 1160 1161 case OVS_NAT_ATTR_PROTO_MAX: 1162 have_proto_max = true; 1163 info->range.max_proto.all = htons(nla_get_u16(a)); 1164 info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; 1165 break; 1166 1167 case OVS_NAT_ATTR_PERSISTENT: 1168 info->range.flags |= NF_NAT_RANGE_PERSISTENT; 1169 break; 1170 1171 case OVS_NAT_ATTR_PROTO_HASH: 1172 info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM; 1173 break; 1174 1175 case OVS_NAT_ATTR_PROTO_RANDOM: 1176 info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY; 1177 break; 1178 1179 default: 1180 OVS_NLERR(log, "Unknown nat attribute (%d)", type); 1181 return -EINVAL; 1182 } 1183 } 1184 1185 if (rem > 0) { 1186 OVS_NLERR(log, "NAT attribute has %d unknown bytes", rem); 1187 return -EINVAL; 1188 } 1189 if (!info->nat) { 1190 /* Do not allow flags if no type is given. */ 1191 if (info->range.flags) { 1192 OVS_NLERR(log, 1193 "NAT flags may be given only when NAT range (SRC or DST) is also specified." 1194 ); 1195 return -EINVAL; 1196 } 1197 info->nat = OVS_CT_NAT; /* NAT existing connections. */ 1198 } else if (!info->commit) { 1199 OVS_NLERR(log, 1200 "NAT attributes may be specified only when CT COMMIT flag is also specified." 1201 ); 1202 return -EINVAL; 1203 } 1204 /* Allow missing IP_MAX. */ 1205 if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) { 1206 memcpy(&info->range.max_addr, &info->range.min_addr, 1207 sizeof(info->range.max_addr)); 1208 } 1209 /* Allow missing PROTO_MAX. */ 1210 if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED && 1211 !have_proto_max) { 1212 info->range.max_proto.all = info->range.min_proto.all; 1213 } 1214 return 0; 1215 } 1216 #endif 1217 1218 static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = { 1219 [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 }, 1220 [OVS_CT_ATTR_FORCE_COMMIT] = { .minlen = 0, .maxlen = 0 }, 1221 [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16), 1222 .maxlen = sizeof(u16) }, 1223 [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark), 1224 .maxlen = sizeof(struct md_mark) }, 1225 [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels), 1226 .maxlen = sizeof(struct md_labels) }, 1227 [OVS_CT_ATTR_HELPER] = { .minlen = 1, 1228 .maxlen = NF_CT_HELPER_NAME_LEN }, 1229 #if IS_ENABLED(CONFIG_NF_NAT) 1230 /* NAT length is checked when parsing the nested attributes. */ 1231 [OVS_CT_ATTR_NAT] = { .minlen = 0, .maxlen = INT_MAX }, 1232 #endif 1233 [OVS_CT_ATTR_EVENTMASK] = { .minlen = sizeof(u32), 1234 .maxlen = sizeof(u32) }, 1235 [OVS_CT_ATTR_TIMEOUT] = { .minlen = 1, 1236 .maxlen = CTNL_TIMEOUT_NAME_MAX }, 1237 }; 1238 1239 static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info, 1240 const char **helper, bool log) 1241 { 1242 struct nlattr *a; 1243 int rem; 1244 1245 nla_for_each_nested(a, attr, rem) { 1246 int type = nla_type(a); 1247 int maxlen; 1248 int minlen; 1249 1250 if (type > OVS_CT_ATTR_MAX) { 1251 OVS_NLERR(log, 1252 "Unknown conntrack attr (type=%d, max=%d)", 1253 type, OVS_CT_ATTR_MAX); 1254 return -EINVAL; 1255 } 1256 1257 maxlen = ovs_ct_attr_lens[type].maxlen; 1258 minlen = ovs_ct_attr_lens[type].minlen; 1259 if (nla_len(a) < minlen || nla_len(a) > maxlen) { 1260 OVS_NLERR(log, 1261 "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)", 1262 type, nla_len(a), maxlen); 1263 return -EINVAL; 1264 } 1265 1266 switch (type) { 1267 case OVS_CT_ATTR_FORCE_COMMIT: 1268 info->force = true; 1269 fallthrough; 1270 case OVS_CT_ATTR_COMMIT: 1271 info->commit = true; 1272 break; 1273 #ifdef CONFIG_NF_CONNTRACK_ZONES 1274 case OVS_CT_ATTR_ZONE: 1275 info->zone.id = nla_get_u16(a); 1276 break; 1277 #endif 1278 #ifdef CONFIG_NF_CONNTRACK_MARK 1279 case OVS_CT_ATTR_MARK: { 1280 struct md_mark *mark = nla_data(a); 1281 1282 if (!mark->mask) { 1283 OVS_NLERR(log, "ct_mark mask cannot be 0"); 1284 return -EINVAL; 1285 } 1286 info->mark = *mark; 1287 break; 1288 } 1289 #endif 1290 #ifdef CONFIG_NF_CONNTRACK_LABELS 1291 case OVS_CT_ATTR_LABELS: { 1292 struct md_labels *labels = nla_data(a); 1293 1294 if (!labels_nonzero(&labels->mask)) { 1295 OVS_NLERR(log, "ct_labels mask cannot be 0"); 1296 return -EINVAL; 1297 } 1298 info->labels = *labels; 1299 break; 1300 } 1301 #endif 1302 case OVS_CT_ATTR_HELPER: 1303 *helper = nla_data(a); 1304 if (!string_is_terminated(*helper, nla_len(a))) { 1305 OVS_NLERR(log, "Invalid conntrack helper"); 1306 return -EINVAL; 1307 } 1308 break; 1309 #if IS_ENABLED(CONFIG_NF_NAT) 1310 case OVS_CT_ATTR_NAT: { 1311 int err = parse_nat(a, info, log); 1312 1313 if (err) 1314 return err; 1315 break; 1316 } 1317 #endif 1318 case OVS_CT_ATTR_EVENTMASK: 1319 info->have_eventmask = true; 1320 info->eventmask = nla_get_u32(a); 1321 break; 1322 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT 1323 case OVS_CT_ATTR_TIMEOUT: 1324 memcpy(info->timeout, nla_data(a), nla_len(a)); 1325 if (!string_is_terminated(info->timeout, nla_len(a))) { 1326 OVS_NLERR(log, "Invalid conntrack timeout"); 1327 return -EINVAL; 1328 } 1329 break; 1330 #endif 1331 1332 default: 1333 OVS_NLERR(log, "Unknown conntrack attr (%d)", 1334 type); 1335 return -EINVAL; 1336 } 1337 } 1338 1339 #ifdef CONFIG_NF_CONNTRACK_MARK 1340 if (!info->commit && info->mark.mask) { 1341 OVS_NLERR(log, 1342 "Setting conntrack mark requires 'commit' flag."); 1343 return -EINVAL; 1344 } 1345 #endif 1346 #ifdef CONFIG_NF_CONNTRACK_LABELS 1347 if (!info->commit && labels_nonzero(&info->labels.mask)) { 1348 OVS_NLERR(log, 1349 "Setting conntrack labels requires 'commit' flag."); 1350 return -EINVAL; 1351 } 1352 #endif 1353 if (rem > 0) { 1354 OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem); 1355 return -EINVAL; 1356 } 1357 1358 return 0; 1359 } 1360 1361 bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr) 1362 { 1363 if (attr == OVS_KEY_ATTR_CT_STATE) 1364 return true; 1365 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 1366 attr == OVS_KEY_ATTR_CT_ZONE) 1367 return true; 1368 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && 1369 attr == OVS_KEY_ATTR_CT_MARK) 1370 return true; 1371 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 1372 attr == OVS_KEY_ATTR_CT_LABELS) { 1373 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1374 1375 return ovs_net->xt_label; 1376 } 1377 1378 return false; 1379 } 1380 1381 int ovs_ct_copy_action(struct net *net, const struct nlattr *attr, 1382 const struct sw_flow_key *key, 1383 struct sw_flow_actions **sfa, bool log) 1384 { 1385 struct ovs_conntrack_info ct_info; 1386 const char *helper = NULL; 1387 u16 family; 1388 int err; 1389 1390 family = key_to_nfproto(key); 1391 if (family == NFPROTO_UNSPEC) { 1392 OVS_NLERR(log, "ct family unspecified"); 1393 return -EINVAL; 1394 } 1395 1396 memset(&ct_info, 0, sizeof(ct_info)); 1397 ct_info.family = family; 1398 1399 nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID, 1400 NF_CT_DEFAULT_ZONE_DIR, 0); 1401 1402 err = parse_ct(attr, &ct_info, &helper, log); 1403 if (err) 1404 return err; 1405 1406 /* Set up template for tracking connections in specific zones. */ 1407 ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL); 1408 if (!ct_info.ct) { 1409 OVS_NLERR(log, "Failed to allocate conntrack template"); 1410 return -ENOMEM; 1411 } 1412 1413 if (ct_info.timeout[0]) { 1414 if (nf_ct_set_timeout(net, ct_info.ct, family, key->ip.proto, 1415 ct_info.timeout)) 1416 OVS_NLERR(log, 1417 "Failed to associated timeout policy '%s'", 1418 ct_info.timeout); 1419 else 1420 ct_info.nf_ct_timeout = rcu_dereference( 1421 nf_ct_timeout_find(ct_info.ct)->timeout); 1422 1423 } 1424 1425 if (helper) { 1426 err = nf_ct_add_helper(ct_info.ct, helper, ct_info.family, 1427 key->ip.proto, ct_info.nat, &ct_info.helper); 1428 if (err) { 1429 OVS_NLERR(log, "Failed to add %s helper %d", helper, err); 1430 goto err_free_ct; 1431 } 1432 } 1433 1434 err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info, 1435 sizeof(ct_info), log); 1436 if (err) 1437 goto err_free_ct; 1438 1439 if (ct_info.commit) 1440 __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status); 1441 return 0; 1442 err_free_ct: 1443 __ovs_ct_free_action(&ct_info); 1444 return err; 1445 } 1446 1447 #if IS_ENABLED(CONFIG_NF_NAT) 1448 static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info, 1449 struct sk_buff *skb) 1450 { 1451 struct nlattr *start; 1452 1453 start = nla_nest_start_noflag(skb, OVS_CT_ATTR_NAT); 1454 if (!start) 1455 return false; 1456 1457 if (info->nat & OVS_CT_SRC_NAT) { 1458 if (nla_put_flag(skb, OVS_NAT_ATTR_SRC)) 1459 return false; 1460 } else if (info->nat & OVS_CT_DST_NAT) { 1461 if (nla_put_flag(skb, OVS_NAT_ATTR_DST)) 1462 return false; 1463 } else { 1464 goto out; 1465 } 1466 1467 if (info->range.flags & NF_NAT_RANGE_MAP_IPS) { 1468 if (IS_ENABLED(CONFIG_NF_NAT) && 1469 info->family == NFPROTO_IPV4) { 1470 if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN, 1471 info->range.min_addr.ip) || 1472 (info->range.max_addr.ip 1473 != info->range.min_addr.ip && 1474 (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX, 1475 info->range.max_addr.ip)))) 1476 return false; 1477 } else if (IS_ENABLED(CONFIG_IPV6) && 1478 info->family == NFPROTO_IPV6) { 1479 if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN, 1480 &info->range.min_addr.in6) || 1481 (memcmp(&info->range.max_addr.in6, 1482 &info->range.min_addr.in6, 1483 sizeof(info->range.max_addr.in6)) && 1484 (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX, 1485 &info->range.max_addr.in6)))) 1486 return false; 1487 } else { 1488 return false; 1489 } 1490 } 1491 if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED && 1492 (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN, 1493 ntohs(info->range.min_proto.all)) || 1494 (info->range.max_proto.all != info->range.min_proto.all && 1495 nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX, 1496 ntohs(info->range.max_proto.all))))) 1497 return false; 1498 1499 if (info->range.flags & NF_NAT_RANGE_PERSISTENT && 1500 nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT)) 1501 return false; 1502 if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM && 1503 nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH)) 1504 return false; 1505 if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY && 1506 nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM)) 1507 return false; 1508 out: 1509 nla_nest_end(skb, start); 1510 1511 return true; 1512 } 1513 #endif 1514 1515 int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info, 1516 struct sk_buff *skb) 1517 { 1518 struct nlattr *start; 1519 1520 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CT); 1521 if (!start) 1522 return -EMSGSIZE; 1523 1524 if (ct_info->commit && nla_put_flag(skb, ct_info->force 1525 ? OVS_CT_ATTR_FORCE_COMMIT 1526 : OVS_CT_ATTR_COMMIT)) 1527 return -EMSGSIZE; 1528 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 1529 nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id)) 1530 return -EMSGSIZE; 1531 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask && 1532 nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark), 1533 &ct_info->mark)) 1534 return -EMSGSIZE; 1535 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 1536 labels_nonzero(&ct_info->labels.mask) && 1537 nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels), 1538 &ct_info->labels)) 1539 return -EMSGSIZE; 1540 if (ct_info->helper) { 1541 if (nla_put_string(skb, OVS_CT_ATTR_HELPER, 1542 ct_info->helper->name)) 1543 return -EMSGSIZE; 1544 } 1545 if (ct_info->have_eventmask && 1546 nla_put_u32(skb, OVS_CT_ATTR_EVENTMASK, ct_info->eventmask)) 1547 return -EMSGSIZE; 1548 if (ct_info->timeout[0]) { 1549 if (nla_put_string(skb, OVS_CT_ATTR_TIMEOUT, ct_info->timeout)) 1550 return -EMSGSIZE; 1551 } 1552 1553 #if IS_ENABLED(CONFIG_NF_NAT) 1554 if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb)) 1555 return -EMSGSIZE; 1556 #endif 1557 nla_nest_end(skb, start); 1558 1559 return 0; 1560 } 1561 1562 void ovs_ct_free_action(const struct nlattr *a) 1563 { 1564 struct ovs_conntrack_info *ct_info = nla_data(a); 1565 1566 __ovs_ct_free_action(ct_info); 1567 } 1568 1569 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info) 1570 { 1571 if (ct_info->helper) { 1572 #if IS_ENABLED(CONFIG_NF_NAT) 1573 if (ct_info->nat) 1574 nf_nat_helper_put(ct_info->helper); 1575 #endif 1576 nf_conntrack_helper_put(ct_info->helper); 1577 } 1578 if (ct_info->ct) { 1579 if (ct_info->timeout[0]) 1580 nf_ct_destroy_timeout(ct_info->ct); 1581 nf_ct_tmpl_free(ct_info->ct); 1582 } 1583 } 1584 1585 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 1586 static int ovs_ct_limit_init(struct net *net, struct ovs_net *ovs_net) 1587 { 1588 int i, err; 1589 1590 ovs_net->ct_limit_info = kmalloc_obj(*ovs_net->ct_limit_info); 1591 if (!ovs_net->ct_limit_info) 1592 return -ENOMEM; 1593 1594 ovs_net->ct_limit_info->default_limit = OVS_CT_LIMIT_DEFAULT; 1595 ovs_net->ct_limit_info->limits = 1596 kmalloc_objs(struct hlist_head, CT_LIMIT_HASH_BUCKETS); 1597 if (!ovs_net->ct_limit_info->limits) { 1598 kfree(ovs_net->ct_limit_info); 1599 return -ENOMEM; 1600 } 1601 1602 for (i = 0; i < CT_LIMIT_HASH_BUCKETS; i++) 1603 INIT_HLIST_HEAD(&ovs_net->ct_limit_info->limits[i]); 1604 1605 ovs_net->ct_limit_info->data = nf_conncount_init(net, sizeof(u32)); 1606 1607 if (IS_ERR(ovs_net->ct_limit_info->data)) { 1608 err = PTR_ERR(ovs_net->ct_limit_info->data); 1609 kfree(ovs_net->ct_limit_info->limits); 1610 kfree(ovs_net->ct_limit_info); 1611 pr_err("openvswitch: failed to init nf_conncount %d\n", err); 1612 return err; 1613 } 1614 return 0; 1615 } 1616 1617 static void ovs_ct_limit_exit(struct net *net, struct ovs_net *ovs_net) 1618 { 1619 const struct ovs_ct_limit_info *info = ovs_net->ct_limit_info; 1620 int i; 1621 1622 nf_conncount_destroy(net, info->data); 1623 for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) { 1624 struct hlist_head *head = &info->limits[i]; 1625 struct ovs_ct_limit *ct_limit; 1626 struct hlist_node *next; 1627 1628 hlist_for_each_entry_safe(ct_limit, next, head, hlist_node) 1629 kfree_rcu(ct_limit, rcu); 1630 } 1631 kfree(info->limits); 1632 kfree(info); 1633 } 1634 1635 static struct sk_buff * 1636 ovs_ct_limit_cmd_reply_start(struct genl_info *info, u8 cmd, 1637 struct ovs_header **ovs_reply_header) 1638 { 1639 struct ovs_header *ovs_header = genl_info_userhdr(info); 1640 struct sk_buff *skb; 1641 1642 skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1643 if (!skb) 1644 return ERR_PTR(-ENOMEM); 1645 1646 *ovs_reply_header = genlmsg_put(skb, info->snd_portid, 1647 info->snd_seq, 1648 &dp_ct_limit_genl_family, 0, cmd); 1649 1650 if (!*ovs_reply_header) { 1651 nlmsg_free(skb); 1652 return ERR_PTR(-EMSGSIZE); 1653 } 1654 (*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex; 1655 1656 return skb; 1657 } 1658 1659 static bool check_zone_id(int zone_id, u16 *pzone) 1660 { 1661 if (zone_id >= 0 && zone_id <= 65535) { 1662 *pzone = (u16)zone_id; 1663 return true; 1664 } 1665 return false; 1666 } 1667 1668 static int ovs_ct_limit_set_zone_limit(struct nlattr *nla_zone_limit, 1669 struct ovs_ct_limit_info *info) 1670 { 1671 struct ovs_zone_limit *zone_limit; 1672 int rem; 1673 u16 zone; 1674 1675 rem = NLA_ALIGN(nla_len(nla_zone_limit)); 1676 zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit); 1677 1678 while (rem >= sizeof(*zone_limit)) { 1679 if (unlikely(zone_limit->zone_id == 1680 OVS_ZONE_LIMIT_DEFAULT_ZONE)) { 1681 ovs_lock(); 1682 info->default_limit = zone_limit->limit; 1683 ovs_unlock(); 1684 } else if (unlikely(!check_zone_id( 1685 zone_limit->zone_id, &zone))) { 1686 OVS_NLERR(true, "zone id is out of range"); 1687 } else { 1688 struct ovs_ct_limit *ct_limit; 1689 1690 ct_limit = kmalloc_obj(*ct_limit, GFP_KERNEL_ACCOUNT); 1691 if (!ct_limit) 1692 return -ENOMEM; 1693 1694 ct_limit->zone = zone; 1695 ct_limit->limit = zone_limit->limit; 1696 1697 ovs_lock(); 1698 ct_limit_set(info, ct_limit); 1699 ovs_unlock(); 1700 } 1701 rem -= NLA_ALIGN(sizeof(*zone_limit)); 1702 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit + 1703 NLA_ALIGN(sizeof(*zone_limit))); 1704 } 1705 1706 if (rem) 1707 OVS_NLERR(true, "set zone limit has %d unknown bytes", rem); 1708 1709 return 0; 1710 } 1711 1712 static int ovs_ct_limit_del_zone_limit(struct nlattr *nla_zone_limit, 1713 struct ovs_ct_limit_info *info) 1714 { 1715 struct ovs_zone_limit *zone_limit; 1716 int rem; 1717 u16 zone; 1718 1719 rem = NLA_ALIGN(nla_len(nla_zone_limit)); 1720 zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit); 1721 1722 while (rem >= sizeof(*zone_limit)) { 1723 if (unlikely(zone_limit->zone_id == 1724 OVS_ZONE_LIMIT_DEFAULT_ZONE)) { 1725 ovs_lock(); 1726 info->default_limit = OVS_CT_LIMIT_DEFAULT; 1727 ovs_unlock(); 1728 } else if (unlikely(!check_zone_id( 1729 zone_limit->zone_id, &zone))) { 1730 OVS_NLERR(true, "zone id is out of range"); 1731 } else { 1732 ovs_lock(); 1733 ct_limit_del(info, zone); 1734 ovs_unlock(); 1735 } 1736 rem -= NLA_ALIGN(sizeof(*zone_limit)); 1737 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit + 1738 NLA_ALIGN(sizeof(*zone_limit))); 1739 } 1740 1741 if (rem) 1742 OVS_NLERR(true, "del zone limit has %d unknown bytes", rem); 1743 1744 return 0; 1745 } 1746 1747 static int ovs_ct_limit_get_default_limit(struct ovs_ct_limit_info *info, 1748 struct sk_buff *reply) 1749 { 1750 struct ovs_zone_limit zone_limit = { 1751 .zone_id = OVS_ZONE_LIMIT_DEFAULT_ZONE, 1752 .limit = info->default_limit, 1753 }; 1754 1755 return nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit); 1756 } 1757 1758 static int __ovs_ct_limit_get_zone_limit(struct net *net, 1759 struct nf_conncount_data *data, 1760 u16 zone_id, u32 limit, 1761 struct sk_buff *reply) 1762 { 1763 struct nf_conntrack_zone ct_zone; 1764 struct ovs_zone_limit zone_limit; 1765 u32 conncount_key = zone_id; 1766 1767 zone_limit.zone_id = zone_id; 1768 zone_limit.limit = limit; 1769 nf_ct_zone_init(&ct_zone, zone_id, NF_CT_DEFAULT_ZONE_DIR, 0); 1770 1771 zone_limit.count = nf_conncount_count_skb(net, NULL, 0, data, 1772 &conncount_key); 1773 return nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit); 1774 } 1775 1776 static int ovs_ct_limit_get_zone_limit(struct net *net, 1777 struct nlattr *nla_zone_limit, 1778 struct ovs_ct_limit_info *info, 1779 struct sk_buff *reply) 1780 { 1781 struct ovs_zone_limit *zone_limit; 1782 int rem, err; 1783 u32 limit; 1784 u16 zone; 1785 1786 rem = NLA_ALIGN(nla_len(nla_zone_limit)); 1787 zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit); 1788 1789 while (rem >= sizeof(*zone_limit)) { 1790 if (unlikely(zone_limit->zone_id == 1791 OVS_ZONE_LIMIT_DEFAULT_ZONE)) { 1792 err = ovs_ct_limit_get_default_limit(info, reply); 1793 if (err) 1794 return err; 1795 } else if (unlikely(!check_zone_id(zone_limit->zone_id, 1796 &zone))) { 1797 OVS_NLERR(true, "zone id is out of range"); 1798 } else { 1799 rcu_read_lock(); 1800 limit = ct_limit_get(info, zone); 1801 1802 err = __ovs_ct_limit_get_zone_limit( 1803 net, info->data, zone, limit, reply); 1804 rcu_read_unlock(); 1805 if (err) 1806 return err; 1807 } 1808 rem -= NLA_ALIGN(sizeof(*zone_limit)); 1809 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit + 1810 NLA_ALIGN(sizeof(*zone_limit))); 1811 } 1812 1813 if (rem) 1814 OVS_NLERR(true, "get zone limit has %d unknown bytes", rem); 1815 1816 return 0; 1817 } 1818 1819 static int ovs_ct_limit_get_all_zone_limit(struct net *net, 1820 struct ovs_ct_limit_info *info, 1821 struct sk_buff *reply) 1822 { 1823 struct ovs_ct_limit *ct_limit; 1824 struct hlist_head *head; 1825 int i, err = 0; 1826 1827 err = ovs_ct_limit_get_default_limit(info, reply); 1828 if (err) 1829 return err; 1830 1831 rcu_read_lock(); 1832 for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) { 1833 head = &info->limits[i]; 1834 hlist_for_each_entry_rcu(ct_limit, head, hlist_node) { 1835 err = __ovs_ct_limit_get_zone_limit(net, info->data, 1836 ct_limit->zone, ct_limit->limit, reply); 1837 if (err) 1838 goto exit_err; 1839 } 1840 } 1841 1842 exit_err: 1843 rcu_read_unlock(); 1844 return err; 1845 } 1846 1847 static int ovs_ct_limit_cmd_set(struct sk_buff *skb, struct genl_info *info) 1848 { 1849 struct nlattr **a = info->attrs; 1850 struct sk_buff *reply; 1851 struct ovs_header *ovs_reply_header; 1852 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1853 struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info; 1854 int err; 1855 1856 reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_SET, 1857 &ovs_reply_header); 1858 if (IS_ERR(reply)) 1859 return PTR_ERR(reply); 1860 1861 if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) { 1862 err = -EINVAL; 1863 goto exit_err; 1864 } 1865 1866 err = ovs_ct_limit_set_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], 1867 ct_limit_info); 1868 if (err) 1869 goto exit_err; 1870 1871 static_branch_enable(&ovs_ct_limit_enabled); 1872 1873 genlmsg_end(reply, ovs_reply_header); 1874 return genlmsg_reply(reply, info); 1875 1876 exit_err: 1877 nlmsg_free(reply); 1878 return err; 1879 } 1880 1881 static int ovs_ct_limit_cmd_del(struct sk_buff *skb, struct genl_info *info) 1882 { 1883 struct nlattr **a = info->attrs; 1884 struct sk_buff *reply; 1885 struct ovs_header *ovs_reply_header; 1886 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); 1887 struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info; 1888 int err; 1889 1890 reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_DEL, 1891 &ovs_reply_header); 1892 if (IS_ERR(reply)) 1893 return PTR_ERR(reply); 1894 1895 if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) { 1896 err = -EINVAL; 1897 goto exit_err; 1898 } 1899 1900 err = ovs_ct_limit_del_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], 1901 ct_limit_info); 1902 if (err) 1903 goto exit_err; 1904 1905 genlmsg_end(reply, ovs_reply_header); 1906 return genlmsg_reply(reply, info); 1907 1908 exit_err: 1909 nlmsg_free(reply); 1910 return err; 1911 } 1912 1913 static int ovs_ct_limit_cmd_get(struct sk_buff *skb, struct genl_info *info) 1914 { 1915 struct nlattr **a = info->attrs; 1916 struct nlattr *nla_reply; 1917 struct sk_buff *reply; 1918 struct ovs_header *ovs_reply_header; 1919 struct net *net = sock_net(skb->sk); 1920 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1921 struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info; 1922 int err; 1923 1924 reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_GET, 1925 &ovs_reply_header); 1926 if (IS_ERR(reply)) 1927 return PTR_ERR(reply); 1928 1929 nla_reply = nla_nest_start_noflag(reply, OVS_CT_LIMIT_ATTR_ZONE_LIMIT); 1930 if (!nla_reply) { 1931 err = -EMSGSIZE; 1932 goto exit_err; 1933 } 1934 1935 if (a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) { 1936 err = ovs_ct_limit_get_zone_limit( 1937 net, a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], ct_limit_info, 1938 reply); 1939 if (err) 1940 goto exit_err; 1941 } else { 1942 err = ovs_ct_limit_get_all_zone_limit(net, ct_limit_info, 1943 reply); 1944 if (err) 1945 goto exit_err; 1946 } 1947 1948 nla_nest_end(reply, nla_reply); 1949 genlmsg_end(reply, ovs_reply_header); 1950 return genlmsg_reply(reply, info); 1951 1952 exit_err: 1953 nlmsg_free(reply); 1954 return err; 1955 } 1956 1957 static const struct genl_small_ops ct_limit_genl_ops[] = { 1958 { .cmd = OVS_CT_LIMIT_CMD_SET, 1959 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1960 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN 1961 * privilege. 1962 */ 1963 .doit = ovs_ct_limit_cmd_set, 1964 }, 1965 { .cmd = OVS_CT_LIMIT_CMD_DEL, 1966 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1967 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN 1968 * privilege. 1969 */ 1970 .doit = ovs_ct_limit_cmd_del, 1971 }, 1972 { .cmd = OVS_CT_LIMIT_CMD_GET, 1973 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1974 .flags = 0, /* OK for unprivileged users. */ 1975 .doit = ovs_ct_limit_cmd_get, 1976 }, 1977 }; 1978 1979 static const struct genl_multicast_group ovs_ct_limit_multicast_group = { 1980 .name = OVS_CT_LIMIT_MCGROUP, 1981 }; 1982 1983 struct genl_family dp_ct_limit_genl_family __ro_after_init = { 1984 .hdrsize = sizeof(struct ovs_header), 1985 .name = OVS_CT_LIMIT_FAMILY, 1986 .version = OVS_CT_LIMIT_VERSION, 1987 .maxattr = OVS_CT_LIMIT_ATTR_MAX, 1988 .policy = ct_limit_policy, 1989 .netnsok = true, 1990 .parallel_ops = true, 1991 .small_ops = ct_limit_genl_ops, 1992 .n_small_ops = ARRAY_SIZE(ct_limit_genl_ops), 1993 .resv_start_op = OVS_CT_LIMIT_CMD_GET + 1, 1994 .mcgrps = &ovs_ct_limit_multicast_group, 1995 .n_mcgrps = 1, 1996 .module = THIS_MODULE, 1997 }; 1998 #endif 1999 2000 int ovs_ct_init(struct net *net) 2001 { 2002 unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE; 2003 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2004 2005 if (nf_connlabels_get(net, n_bits - 1)) { 2006 ovs_net->xt_label = false; 2007 OVS_NLERR(true, "Failed to set connlabel length"); 2008 } else { 2009 ovs_net->xt_label = true; 2010 } 2011 2012 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2013 return ovs_ct_limit_init(net, ovs_net); 2014 #else 2015 return 0; 2016 #endif 2017 } 2018 2019 void ovs_ct_exit(struct net *net) 2020 { 2021 struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 2022 2023 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) 2024 ovs_ct_limit_exit(net, ovs_net); 2025 #endif 2026 2027 if (ovs_net->xt_label) 2028 nf_connlabels_put(net); 2029 } 2030