1 /* 2 * Bridge multicast support. 3 * 4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the Free 8 * Software Foundation; either version 2 of the License, or (at your option) 9 * any later version. 10 * 11 */ 12 13 #include <linux/err.h> 14 #include <linux/export.h> 15 #include <linux/if_ether.h> 16 #include <linux/igmp.h> 17 #include <linux/jhash.h> 18 #include <linux/kernel.h> 19 #include <linux/log2.h> 20 #include <linux/netdevice.h> 21 #include <linux/netfilter_bridge.h> 22 #include <linux/random.h> 23 #include <linux/rculist.h> 24 #include <linux/skbuff.h> 25 #include <linux/slab.h> 26 #include <linux/timer.h> 27 #include <linux/inetdevice.h> 28 #include <net/ip.h> 29 #if IS_ENABLED(CONFIG_IPV6) 30 #include <net/ipv6.h> 31 #include <net/mld.h> 32 #include <net/ip6_checksum.h> 33 #include <net/addrconf.h> 34 #endif 35 36 #include "br_private.h" 37 38 static void br_multicast_start_querier(struct net_bridge *br, 39 struct bridge_mcast_own_query *query); 40 unsigned int br_mdb_rehash_seq; 41 42 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) 43 { 44 if (a->proto != b->proto) 45 return 0; 46 if (a->vid != b->vid) 47 return 0; 48 switch (a->proto) { 49 case htons(ETH_P_IP): 50 return a->u.ip4 == b->u.ip4; 51 #if IS_ENABLED(CONFIG_IPV6) 52 case htons(ETH_P_IPV6): 53 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); 54 #endif 55 } 56 return 0; 57 } 58 59 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip, 60 __u16 vid) 61 { 62 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1); 63 } 64 65 #if IS_ENABLED(CONFIG_IPV6) 66 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, 67 const struct in6_addr *ip, 68 __u16 vid) 69 { 70 return jhash_2words(ipv6_addr_hash(ip), vid, 71 mdb->secret) & (mdb->max - 1); 72 } 73 #endif 74 75 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, 76 struct br_ip *ip) 77 { 78 switch (ip->proto) { 79 case htons(ETH_P_IP): 80 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid); 81 #if IS_ENABLED(CONFIG_IPV6) 82 case htons(ETH_P_IPV6): 83 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid); 84 #endif 85 } 86 return 0; 87 } 88 89 static struct net_bridge_mdb_entry *__br_mdb_ip_get( 90 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) 91 { 92 struct net_bridge_mdb_entry *mp; 93 94 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) { 95 if (br_ip_equal(&mp->addr, dst)) 96 return mp; 97 } 98 99 return NULL; 100 } 101 102 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, 103 struct br_ip *dst) 104 { 105 if (!mdb) 106 return NULL; 107 108 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); 109 } 110 111 static struct net_bridge_mdb_entry *br_mdb_ip4_get( 112 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid) 113 { 114 struct br_ip br_dst; 115 116 br_dst.u.ip4 = dst; 117 br_dst.proto = htons(ETH_P_IP); 118 br_dst.vid = vid; 119 120 return br_mdb_ip_get(mdb, &br_dst); 121 } 122 123 #if IS_ENABLED(CONFIG_IPV6) 124 static struct net_bridge_mdb_entry *br_mdb_ip6_get( 125 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst, 126 __u16 vid) 127 { 128 struct br_ip br_dst; 129 130 br_dst.u.ip6 = *dst; 131 br_dst.proto = htons(ETH_P_IPV6); 132 br_dst.vid = vid; 133 134 return br_mdb_ip_get(mdb, &br_dst); 135 } 136 #endif 137 138 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 139 struct sk_buff *skb, u16 vid) 140 { 141 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb); 142 struct br_ip ip; 143 144 if (br->multicast_disabled) 145 return NULL; 146 147 if (BR_INPUT_SKB_CB(skb)->igmp) 148 return NULL; 149 150 ip.proto = skb->protocol; 151 ip.vid = vid; 152 153 switch (skb->protocol) { 154 case htons(ETH_P_IP): 155 ip.u.ip4 = ip_hdr(skb)->daddr; 156 break; 157 #if IS_ENABLED(CONFIG_IPV6) 158 case htons(ETH_P_IPV6): 159 ip.u.ip6 = ipv6_hdr(skb)->daddr; 160 break; 161 #endif 162 default: 163 return NULL; 164 } 165 166 return br_mdb_ip_get(mdb, &ip); 167 } 168 169 static void br_mdb_free(struct rcu_head *head) 170 { 171 struct net_bridge_mdb_htable *mdb = 172 container_of(head, struct net_bridge_mdb_htable, rcu); 173 struct net_bridge_mdb_htable *old = mdb->old; 174 175 mdb->old = NULL; 176 kfree(old->mhash); 177 kfree(old); 178 } 179 180 static int br_mdb_copy(struct net_bridge_mdb_htable *new, 181 struct net_bridge_mdb_htable *old, 182 int elasticity) 183 { 184 struct net_bridge_mdb_entry *mp; 185 int maxlen; 186 int len; 187 int i; 188 189 for (i = 0; i < old->max; i++) 190 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver]) 191 hlist_add_head(&mp->hlist[new->ver], 192 &new->mhash[br_ip_hash(new, &mp->addr)]); 193 194 if (!elasticity) 195 return 0; 196 197 maxlen = 0; 198 for (i = 0; i < new->max; i++) { 199 len = 0; 200 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver]) 201 len++; 202 if (len > maxlen) 203 maxlen = len; 204 } 205 206 return maxlen > elasticity ? -EINVAL : 0; 207 } 208 209 void br_multicast_free_pg(struct rcu_head *head) 210 { 211 struct net_bridge_port_group *p = 212 container_of(head, struct net_bridge_port_group, rcu); 213 214 kfree(p); 215 } 216 217 static void br_multicast_free_group(struct rcu_head *head) 218 { 219 struct net_bridge_mdb_entry *mp = 220 container_of(head, struct net_bridge_mdb_entry, rcu); 221 222 kfree(mp); 223 } 224 225 static void br_multicast_group_expired(unsigned long data) 226 { 227 struct net_bridge_mdb_entry *mp = (void *)data; 228 struct net_bridge *br = mp->br; 229 struct net_bridge_mdb_htable *mdb; 230 231 spin_lock(&br->multicast_lock); 232 if (!netif_running(br->dev) || timer_pending(&mp->timer)) 233 goto out; 234 235 mp->mglist = false; 236 237 if (mp->ports) 238 goto out; 239 240 mdb = mlock_dereference(br->mdb, br); 241 242 hlist_del_rcu(&mp->hlist[mdb->ver]); 243 mdb->size--; 244 245 call_rcu_bh(&mp->rcu, br_multicast_free_group); 246 247 out: 248 spin_unlock(&br->multicast_lock); 249 } 250 251 static void br_multicast_del_pg(struct net_bridge *br, 252 struct net_bridge_port_group *pg) 253 { 254 struct net_bridge_mdb_htable *mdb; 255 struct net_bridge_mdb_entry *mp; 256 struct net_bridge_port_group *p; 257 struct net_bridge_port_group __rcu **pp; 258 259 mdb = mlock_dereference(br->mdb, br); 260 261 mp = br_mdb_ip_get(mdb, &pg->addr); 262 if (WARN_ON(!mp)) 263 return; 264 265 for (pp = &mp->ports; 266 (p = mlock_dereference(*pp, br)) != NULL; 267 pp = &p->next) { 268 if (p != pg) 269 continue; 270 271 rcu_assign_pointer(*pp, p->next); 272 hlist_del_init(&p->mglist); 273 del_timer(&p->timer); 274 call_rcu_bh(&p->rcu, br_multicast_free_pg); 275 276 if (!mp->ports && !mp->mglist && 277 netif_running(br->dev)) 278 mod_timer(&mp->timer, jiffies); 279 280 return; 281 } 282 283 WARN_ON(1); 284 } 285 286 static void br_multicast_port_group_expired(unsigned long data) 287 { 288 struct net_bridge_port_group *pg = (void *)data; 289 struct net_bridge *br = pg->port->br; 290 291 spin_lock(&br->multicast_lock); 292 if (!netif_running(br->dev) || timer_pending(&pg->timer) || 293 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT) 294 goto out; 295 296 br_multicast_del_pg(br, pg); 297 298 out: 299 spin_unlock(&br->multicast_lock); 300 } 301 302 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, 303 int elasticity) 304 { 305 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); 306 struct net_bridge_mdb_htable *mdb; 307 int err; 308 309 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); 310 if (!mdb) 311 return -ENOMEM; 312 313 mdb->max = max; 314 mdb->old = old; 315 316 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); 317 if (!mdb->mhash) { 318 kfree(mdb); 319 return -ENOMEM; 320 } 321 322 mdb->size = old ? old->size : 0; 323 mdb->ver = old ? old->ver ^ 1 : 0; 324 325 if (!old || elasticity) 326 get_random_bytes(&mdb->secret, sizeof(mdb->secret)); 327 else 328 mdb->secret = old->secret; 329 330 if (!old) 331 goto out; 332 333 err = br_mdb_copy(mdb, old, elasticity); 334 if (err) { 335 kfree(mdb->mhash); 336 kfree(mdb); 337 return err; 338 } 339 340 br_mdb_rehash_seq++; 341 call_rcu_bh(&mdb->rcu, br_mdb_free); 342 343 out: 344 rcu_assign_pointer(*mdbp, mdb); 345 346 return 0; 347 } 348 349 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, 350 __be32 group) 351 { 352 struct sk_buff *skb; 353 struct igmphdr *ih; 354 struct ethhdr *eth; 355 struct iphdr *iph; 356 357 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + 358 sizeof(*ih) + 4); 359 if (!skb) 360 goto out; 361 362 skb->protocol = htons(ETH_P_IP); 363 364 skb_reset_mac_header(skb); 365 eth = eth_hdr(skb); 366 367 ether_addr_copy(eth->h_source, br->dev->dev_addr); 368 eth->h_dest[0] = 1; 369 eth->h_dest[1] = 0; 370 eth->h_dest[2] = 0x5e; 371 eth->h_dest[3] = 0; 372 eth->h_dest[4] = 0; 373 eth->h_dest[5] = 1; 374 eth->h_proto = htons(ETH_P_IP); 375 skb_put(skb, sizeof(*eth)); 376 377 skb_set_network_header(skb, skb->len); 378 iph = ip_hdr(skb); 379 380 iph->version = 4; 381 iph->ihl = 6; 382 iph->tos = 0xc0; 383 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); 384 iph->id = 0; 385 iph->frag_off = htons(IP_DF); 386 iph->ttl = 1; 387 iph->protocol = IPPROTO_IGMP; 388 iph->saddr = br->multicast_query_use_ifaddr ? 389 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0; 390 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); 391 ((u8 *)&iph[1])[0] = IPOPT_RA; 392 ((u8 *)&iph[1])[1] = 4; 393 ((u8 *)&iph[1])[2] = 0; 394 ((u8 *)&iph[1])[3] = 0; 395 ip_send_check(iph); 396 skb_put(skb, 24); 397 398 skb_set_transport_header(skb, skb->len); 399 ih = igmp_hdr(skb); 400 ih->type = IGMP_HOST_MEMBERSHIP_QUERY; 401 ih->code = (group ? br->multicast_last_member_interval : 402 br->multicast_query_response_interval) / 403 (HZ / IGMP_TIMER_SCALE); 404 ih->group = group; 405 ih->csum = 0; 406 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 407 skb_put(skb, sizeof(*ih)); 408 409 __skb_pull(skb, sizeof(*eth)); 410 411 out: 412 return skb; 413 } 414 415 #if IS_ENABLED(CONFIG_IPV6) 416 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, 417 const struct in6_addr *group) 418 { 419 struct sk_buff *skb; 420 struct ipv6hdr *ip6h; 421 struct mld_msg *mldq; 422 struct ethhdr *eth; 423 u8 *hopopt; 424 unsigned long interval; 425 426 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + 427 8 + sizeof(*mldq)); 428 if (!skb) 429 goto out; 430 431 skb->protocol = htons(ETH_P_IPV6); 432 433 /* Ethernet header */ 434 skb_reset_mac_header(skb); 435 eth = eth_hdr(skb); 436 437 ether_addr_copy(eth->h_source, br->dev->dev_addr); 438 eth->h_proto = htons(ETH_P_IPV6); 439 skb_put(skb, sizeof(*eth)); 440 441 /* IPv6 header + HbH option */ 442 skb_set_network_header(skb, skb->len); 443 ip6h = ipv6_hdr(skb); 444 445 *(__force __be32 *)ip6h = htonl(0x60000000); 446 ip6h->payload_len = htons(8 + sizeof(*mldq)); 447 ip6h->nexthdr = IPPROTO_HOPOPTS; 448 ip6h->hop_limit = 1; 449 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); 450 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, 451 &ip6h->saddr)) { 452 kfree_skb(skb); 453 return NULL; 454 } 455 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 456 457 hopopt = (u8 *)(ip6h + 1); 458 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ 459 hopopt[1] = 0; /* length of HbH */ 460 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ 461 hopopt[3] = 2; /* Length of RA Option */ 462 hopopt[4] = 0; /* Type = 0x0000 (MLD) */ 463 hopopt[5] = 0; 464 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ 465 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ 466 467 skb_put(skb, sizeof(*ip6h) + 8); 468 469 /* ICMPv6 */ 470 skb_set_transport_header(skb, skb->len); 471 mldq = (struct mld_msg *) icmp6_hdr(skb); 472 473 interval = ipv6_addr_any(group) ? 474 br->multicast_query_response_interval : 475 br->multicast_last_member_interval; 476 477 mldq->mld_type = ICMPV6_MGM_QUERY; 478 mldq->mld_code = 0; 479 mldq->mld_cksum = 0; 480 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); 481 mldq->mld_reserved = 0; 482 mldq->mld_mca = *group; 483 484 /* checksum */ 485 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 486 sizeof(*mldq), IPPROTO_ICMPV6, 487 csum_partial(mldq, 488 sizeof(*mldq), 0)); 489 skb_put(skb, sizeof(*mldq)); 490 491 __skb_pull(skb, sizeof(*eth)); 492 493 out: 494 return skb; 495 } 496 #endif 497 498 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, 499 struct br_ip *addr) 500 { 501 switch (addr->proto) { 502 case htons(ETH_P_IP): 503 return br_ip4_multicast_alloc_query(br, addr->u.ip4); 504 #if IS_ENABLED(CONFIG_IPV6) 505 case htons(ETH_P_IPV6): 506 return br_ip6_multicast_alloc_query(br, &addr->u.ip6); 507 #endif 508 } 509 return NULL; 510 } 511 512 static struct net_bridge_mdb_entry *br_multicast_get_group( 513 struct net_bridge *br, struct net_bridge_port *port, 514 struct br_ip *group, int hash) 515 { 516 struct net_bridge_mdb_htable *mdb; 517 struct net_bridge_mdb_entry *mp; 518 unsigned int count = 0; 519 unsigned int max; 520 int elasticity; 521 int err; 522 523 mdb = rcu_dereference_protected(br->mdb, 1); 524 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) { 525 count++; 526 if (unlikely(br_ip_equal(group, &mp->addr))) 527 return mp; 528 } 529 530 elasticity = 0; 531 max = mdb->max; 532 533 if (unlikely(count > br->hash_elasticity && count)) { 534 if (net_ratelimit()) 535 br_info(br, "Multicast hash table " 536 "chain limit reached: %s\n", 537 port ? port->dev->name : br->dev->name); 538 539 elasticity = br->hash_elasticity; 540 } 541 542 if (mdb->size >= max) { 543 max *= 2; 544 if (unlikely(max > br->hash_max)) { 545 br_warn(br, "Multicast hash table maximum of %d " 546 "reached, disabling snooping: %s\n", 547 br->hash_max, 548 port ? port->dev->name : br->dev->name); 549 err = -E2BIG; 550 disable: 551 br->multicast_disabled = 1; 552 goto err; 553 } 554 } 555 556 if (max > mdb->max || elasticity) { 557 if (mdb->old) { 558 if (net_ratelimit()) 559 br_info(br, "Multicast hash table " 560 "on fire: %s\n", 561 port ? port->dev->name : br->dev->name); 562 err = -EEXIST; 563 goto err; 564 } 565 566 err = br_mdb_rehash(&br->mdb, max, elasticity); 567 if (err) { 568 br_warn(br, "Cannot rehash multicast " 569 "hash table, disabling snooping: %s, %d, %d\n", 570 port ? port->dev->name : br->dev->name, 571 mdb->size, err); 572 goto disable; 573 } 574 575 err = -EAGAIN; 576 goto err; 577 } 578 579 return NULL; 580 581 err: 582 mp = ERR_PTR(err); 583 return mp; 584 } 585 586 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, 587 struct net_bridge_port *port, struct br_ip *group) 588 { 589 struct net_bridge_mdb_htable *mdb; 590 struct net_bridge_mdb_entry *mp; 591 int hash; 592 int err; 593 594 mdb = rcu_dereference_protected(br->mdb, 1); 595 if (!mdb) { 596 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); 597 if (err) 598 return ERR_PTR(err); 599 goto rehash; 600 } 601 602 hash = br_ip_hash(mdb, group); 603 mp = br_multicast_get_group(br, port, group, hash); 604 switch (PTR_ERR(mp)) { 605 case 0: 606 break; 607 608 case -EAGAIN: 609 rehash: 610 mdb = rcu_dereference_protected(br->mdb, 1); 611 hash = br_ip_hash(mdb, group); 612 break; 613 614 default: 615 goto out; 616 } 617 618 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 619 if (unlikely(!mp)) 620 return ERR_PTR(-ENOMEM); 621 622 mp->br = br; 623 mp->addr = *group; 624 setup_timer(&mp->timer, br_multicast_group_expired, 625 (unsigned long)mp); 626 627 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); 628 mdb->size++; 629 630 out: 631 return mp; 632 } 633 634 struct net_bridge_port_group *br_multicast_new_port_group( 635 struct net_bridge_port *port, 636 struct br_ip *group, 637 struct net_bridge_port_group __rcu *next, 638 unsigned char state) 639 { 640 struct net_bridge_port_group *p; 641 642 p = kzalloc(sizeof(*p), GFP_ATOMIC); 643 if (unlikely(!p)) 644 return NULL; 645 646 p->addr = *group; 647 p->port = port; 648 p->state = state; 649 rcu_assign_pointer(p->next, next); 650 hlist_add_head(&p->mglist, &port->mglist); 651 setup_timer(&p->timer, br_multicast_port_group_expired, 652 (unsigned long)p); 653 return p; 654 } 655 656 static int br_multicast_add_group(struct net_bridge *br, 657 struct net_bridge_port *port, 658 struct br_ip *group) 659 { 660 struct net_bridge_mdb_entry *mp; 661 struct net_bridge_port_group *p; 662 struct net_bridge_port_group __rcu **pp; 663 unsigned long now = jiffies; 664 int err; 665 666 spin_lock(&br->multicast_lock); 667 if (!netif_running(br->dev) || 668 (port && port->state == BR_STATE_DISABLED)) 669 goto out; 670 671 mp = br_multicast_new_group(br, port, group); 672 err = PTR_ERR(mp); 673 if (IS_ERR(mp)) 674 goto err; 675 676 if (!port) { 677 mp->mglist = true; 678 mod_timer(&mp->timer, now + br->multicast_membership_interval); 679 goto out; 680 } 681 682 for (pp = &mp->ports; 683 (p = mlock_dereference(*pp, br)) != NULL; 684 pp = &p->next) { 685 if (p->port == port) 686 goto found; 687 if ((unsigned long)p->port < (unsigned long)port) 688 break; 689 } 690 691 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY); 692 if (unlikely(!p)) 693 goto err; 694 rcu_assign_pointer(*pp, p); 695 br_mdb_notify(br->dev, port, group, RTM_NEWMDB); 696 697 found: 698 mod_timer(&p->timer, now + br->multicast_membership_interval); 699 out: 700 err = 0; 701 702 err: 703 spin_unlock(&br->multicast_lock); 704 return err; 705 } 706 707 static int br_ip4_multicast_add_group(struct net_bridge *br, 708 struct net_bridge_port *port, 709 __be32 group, 710 __u16 vid) 711 { 712 struct br_ip br_group; 713 714 if (ipv4_is_local_multicast(group)) 715 return 0; 716 717 br_group.u.ip4 = group; 718 br_group.proto = htons(ETH_P_IP); 719 br_group.vid = vid; 720 721 return br_multicast_add_group(br, port, &br_group); 722 } 723 724 #if IS_ENABLED(CONFIG_IPV6) 725 static int br_ip6_multicast_add_group(struct net_bridge *br, 726 struct net_bridge_port *port, 727 const struct in6_addr *group, 728 __u16 vid) 729 { 730 struct br_ip br_group; 731 732 if (ipv6_addr_is_ll_all_nodes(group)) 733 return 0; 734 735 br_group.u.ip6 = *group; 736 br_group.proto = htons(ETH_P_IPV6); 737 br_group.vid = vid; 738 739 return br_multicast_add_group(br, port, &br_group); 740 } 741 #endif 742 743 static void br_multicast_router_expired(unsigned long data) 744 { 745 struct net_bridge_port *port = (void *)data; 746 struct net_bridge *br = port->br; 747 748 spin_lock(&br->multicast_lock); 749 if (port->multicast_router != 1 || 750 timer_pending(&port->multicast_router_timer) || 751 hlist_unhashed(&port->rlist)) 752 goto out; 753 754 hlist_del_init_rcu(&port->rlist); 755 756 out: 757 spin_unlock(&br->multicast_lock); 758 } 759 760 static void br_multicast_local_router_expired(unsigned long data) 761 { 762 } 763 764 static void br_multicast_querier_expired(struct net_bridge *br, 765 struct bridge_mcast_own_query *query) 766 { 767 spin_lock(&br->multicast_lock); 768 if (!netif_running(br->dev) || br->multicast_disabled) 769 goto out; 770 771 br_multicast_start_querier(br, query); 772 773 out: 774 spin_unlock(&br->multicast_lock); 775 } 776 777 static void br_ip4_multicast_querier_expired(unsigned long data) 778 { 779 struct net_bridge *br = (void *)data; 780 781 br_multicast_querier_expired(br, &br->ip4_own_query); 782 } 783 784 #if IS_ENABLED(CONFIG_IPV6) 785 static void br_ip6_multicast_querier_expired(unsigned long data) 786 { 787 struct net_bridge *br = (void *)data; 788 789 br_multicast_querier_expired(br, &br->ip6_own_query); 790 } 791 #endif 792 793 static void br_multicast_select_own_querier(struct net_bridge *br, 794 struct br_ip *ip, 795 struct sk_buff *skb) 796 { 797 if (ip->proto == htons(ETH_P_IP)) 798 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr; 799 #if IS_ENABLED(CONFIG_IPV6) 800 else 801 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr; 802 #endif 803 } 804 805 static void __br_multicast_send_query(struct net_bridge *br, 806 struct net_bridge_port *port, 807 struct br_ip *ip) 808 { 809 struct sk_buff *skb; 810 811 skb = br_multicast_alloc_query(br, ip); 812 if (!skb) 813 return; 814 815 if (port) { 816 __skb_push(skb, sizeof(struct ethhdr)); 817 skb->dev = port->dev; 818 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, 819 dev_queue_xmit); 820 } else { 821 br_multicast_select_own_querier(br, ip, skb); 822 netif_rx(skb); 823 } 824 } 825 826 static void br_multicast_send_query(struct net_bridge *br, 827 struct net_bridge_port *port, 828 struct bridge_mcast_own_query *own_query) 829 { 830 unsigned long time; 831 struct br_ip br_group; 832 struct bridge_mcast_other_query *other_query = NULL; 833 834 if (!netif_running(br->dev) || br->multicast_disabled || 835 !br->multicast_querier) 836 return; 837 838 memset(&br_group.u, 0, sizeof(br_group.u)); 839 840 if (port ? (own_query == &port->ip4_own_query) : 841 (own_query == &br->ip4_own_query)) { 842 other_query = &br->ip4_other_query; 843 br_group.proto = htons(ETH_P_IP); 844 #if IS_ENABLED(CONFIG_IPV6) 845 } else { 846 other_query = &br->ip6_other_query; 847 br_group.proto = htons(ETH_P_IPV6); 848 #endif 849 } 850 851 if (!other_query || timer_pending(&other_query->timer)) 852 return; 853 854 __br_multicast_send_query(br, port, &br_group); 855 856 time = jiffies; 857 time += own_query->startup_sent < br->multicast_startup_query_count ? 858 br->multicast_startup_query_interval : 859 br->multicast_query_interval; 860 mod_timer(&own_query->timer, time); 861 } 862 863 static void 864 br_multicast_port_query_expired(struct net_bridge_port *port, 865 struct bridge_mcast_own_query *query) 866 { 867 struct net_bridge *br = port->br; 868 869 spin_lock(&br->multicast_lock); 870 if (port->state == BR_STATE_DISABLED || 871 port->state == BR_STATE_BLOCKING) 872 goto out; 873 874 if (query->startup_sent < br->multicast_startup_query_count) 875 query->startup_sent++; 876 877 br_multicast_send_query(port->br, port, query); 878 879 out: 880 spin_unlock(&br->multicast_lock); 881 } 882 883 static void br_ip4_multicast_port_query_expired(unsigned long data) 884 { 885 struct net_bridge_port *port = (void *)data; 886 887 br_multicast_port_query_expired(port, &port->ip4_own_query); 888 } 889 890 #if IS_ENABLED(CONFIG_IPV6) 891 static void br_ip6_multicast_port_query_expired(unsigned long data) 892 { 893 struct net_bridge_port *port = (void *)data; 894 895 br_multicast_port_query_expired(port, &port->ip6_own_query); 896 } 897 #endif 898 899 void br_multicast_add_port(struct net_bridge_port *port) 900 { 901 port->multicast_router = 1; 902 903 setup_timer(&port->multicast_router_timer, br_multicast_router_expired, 904 (unsigned long)port); 905 setup_timer(&port->ip4_own_query.timer, 906 br_ip4_multicast_port_query_expired, (unsigned long)port); 907 #if IS_ENABLED(CONFIG_IPV6) 908 setup_timer(&port->ip6_own_query.timer, 909 br_ip6_multicast_port_query_expired, (unsigned long)port); 910 #endif 911 } 912 913 void br_multicast_del_port(struct net_bridge_port *port) 914 { 915 del_timer_sync(&port->multicast_router_timer); 916 } 917 918 static void br_multicast_enable(struct bridge_mcast_own_query *query) 919 { 920 query->startup_sent = 0; 921 922 if (try_to_del_timer_sync(&query->timer) >= 0 || 923 del_timer(&query->timer)) 924 mod_timer(&query->timer, jiffies); 925 } 926 927 void br_multicast_enable_port(struct net_bridge_port *port) 928 { 929 struct net_bridge *br = port->br; 930 931 spin_lock(&br->multicast_lock); 932 if (br->multicast_disabled || !netif_running(br->dev)) 933 goto out; 934 935 br_multicast_enable(&port->ip4_own_query); 936 #if IS_ENABLED(CONFIG_IPV6) 937 br_multicast_enable(&port->ip6_own_query); 938 #endif 939 940 out: 941 spin_unlock(&br->multicast_lock); 942 } 943 944 void br_multicast_disable_port(struct net_bridge_port *port) 945 { 946 struct net_bridge *br = port->br; 947 struct net_bridge_port_group *pg; 948 struct hlist_node *n; 949 950 spin_lock(&br->multicast_lock); 951 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 952 br_multicast_del_pg(br, pg); 953 954 if (!hlist_unhashed(&port->rlist)) 955 hlist_del_init_rcu(&port->rlist); 956 del_timer(&port->multicast_router_timer); 957 del_timer(&port->ip4_own_query.timer); 958 #if IS_ENABLED(CONFIG_IPV6) 959 del_timer(&port->ip6_own_query.timer); 960 #endif 961 spin_unlock(&br->multicast_lock); 962 } 963 964 static int br_ip4_multicast_igmp3_report(struct net_bridge *br, 965 struct net_bridge_port *port, 966 struct sk_buff *skb, 967 u16 vid) 968 { 969 struct igmpv3_report *ih; 970 struct igmpv3_grec *grec; 971 int i; 972 int len; 973 int num; 974 int type; 975 int err = 0; 976 __be32 group; 977 978 if (!pskb_may_pull(skb, sizeof(*ih))) 979 return -EINVAL; 980 981 ih = igmpv3_report_hdr(skb); 982 num = ntohs(ih->ngrec); 983 len = sizeof(*ih); 984 985 for (i = 0; i < num; i++) { 986 len += sizeof(*grec); 987 if (!pskb_may_pull(skb, len)) 988 return -EINVAL; 989 990 grec = (void *)(skb->data + len - sizeof(*grec)); 991 group = grec->grec_mca; 992 type = grec->grec_type; 993 994 len += ntohs(grec->grec_nsrcs) * 4; 995 if (!pskb_may_pull(skb, len)) 996 return -EINVAL; 997 998 /* We treat this as an IGMPv2 report for now. */ 999 switch (type) { 1000 case IGMPV3_MODE_IS_INCLUDE: 1001 case IGMPV3_MODE_IS_EXCLUDE: 1002 case IGMPV3_CHANGE_TO_INCLUDE: 1003 case IGMPV3_CHANGE_TO_EXCLUDE: 1004 case IGMPV3_ALLOW_NEW_SOURCES: 1005 case IGMPV3_BLOCK_OLD_SOURCES: 1006 break; 1007 1008 default: 1009 continue; 1010 } 1011 1012 err = br_ip4_multicast_add_group(br, port, group, vid); 1013 if (err) 1014 break; 1015 } 1016 1017 return err; 1018 } 1019 1020 #if IS_ENABLED(CONFIG_IPV6) 1021 static int br_ip6_multicast_mld2_report(struct net_bridge *br, 1022 struct net_bridge_port *port, 1023 struct sk_buff *skb, 1024 u16 vid) 1025 { 1026 struct icmp6hdr *icmp6h; 1027 struct mld2_grec *grec; 1028 int i; 1029 int len; 1030 int num; 1031 int err = 0; 1032 1033 if (!pskb_may_pull(skb, sizeof(*icmp6h))) 1034 return -EINVAL; 1035 1036 icmp6h = icmp6_hdr(skb); 1037 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 1038 len = sizeof(*icmp6h); 1039 1040 for (i = 0; i < num; i++) { 1041 __be16 *nsrcs, _nsrcs; 1042 1043 nsrcs = skb_header_pointer(skb, 1044 len + offsetof(struct mld2_grec, 1045 grec_nsrcs), 1046 sizeof(_nsrcs), &_nsrcs); 1047 if (!nsrcs) 1048 return -EINVAL; 1049 1050 if (!pskb_may_pull(skb, 1051 len + sizeof(*grec) + 1052 sizeof(struct in6_addr) * ntohs(*nsrcs))) 1053 return -EINVAL; 1054 1055 grec = (struct mld2_grec *)(skb->data + len); 1056 len += sizeof(*grec) + 1057 sizeof(struct in6_addr) * ntohs(*nsrcs); 1058 1059 /* We treat these as MLDv1 reports for now. */ 1060 switch (grec->grec_type) { 1061 case MLD2_MODE_IS_INCLUDE: 1062 case MLD2_MODE_IS_EXCLUDE: 1063 case MLD2_CHANGE_TO_INCLUDE: 1064 case MLD2_CHANGE_TO_EXCLUDE: 1065 case MLD2_ALLOW_NEW_SOURCES: 1066 case MLD2_BLOCK_OLD_SOURCES: 1067 break; 1068 1069 default: 1070 continue; 1071 } 1072 1073 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca, 1074 vid); 1075 if (!err) 1076 break; 1077 } 1078 1079 return err; 1080 } 1081 #endif 1082 1083 static bool br_ip4_multicast_select_querier(struct net_bridge *br, 1084 __be32 saddr) 1085 { 1086 if (!timer_pending(&br->ip4_own_query.timer) && 1087 !timer_pending(&br->ip4_other_query.timer)) 1088 goto update; 1089 1090 if (!br->ip4_querier.addr.u.ip4) 1091 goto update; 1092 1093 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4)) 1094 goto update; 1095 1096 return false; 1097 1098 update: 1099 br->ip4_querier.addr.u.ip4 = saddr; 1100 1101 return true; 1102 } 1103 1104 #if IS_ENABLED(CONFIG_IPV6) 1105 static bool br_ip6_multicast_select_querier(struct net_bridge *br, 1106 struct in6_addr *saddr) 1107 { 1108 if (!timer_pending(&br->ip6_own_query.timer) && 1109 !timer_pending(&br->ip6_other_query.timer)) 1110 goto update; 1111 1112 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0) 1113 goto update; 1114 1115 return false; 1116 1117 update: 1118 br->ip6_querier.addr.u.ip6 = *saddr; 1119 1120 return true; 1121 } 1122 #endif 1123 1124 static bool br_multicast_select_querier(struct net_bridge *br, 1125 struct br_ip *saddr) 1126 { 1127 switch (saddr->proto) { 1128 case htons(ETH_P_IP): 1129 return br_ip4_multicast_select_querier(br, saddr->u.ip4); 1130 #if IS_ENABLED(CONFIG_IPV6) 1131 case htons(ETH_P_IPV6): 1132 return br_ip6_multicast_select_querier(br, &saddr->u.ip6); 1133 #endif 1134 } 1135 1136 return false; 1137 } 1138 1139 static void 1140 br_multicast_update_query_timer(struct net_bridge *br, 1141 struct bridge_mcast_other_query *query, 1142 unsigned long max_delay) 1143 { 1144 if (!timer_pending(&query->timer)) 1145 query->delay_time = jiffies + max_delay; 1146 1147 mod_timer(&query->timer, jiffies + br->multicast_querier_interval); 1148 } 1149 1150 /* 1151 * Add port to router_list 1152 * list is maintained ordered by pointer value 1153 * and locked by br->multicast_lock and RCU 1154 */ 1155 static void br_multicast_add_router(struct net_bridge *br, 1156 struct net_bridge_port *port) 1157 { 1158 struct net_bridge_port *p; 1159 struct hlist_node *slot = NULL; 1160 1161 hlist_for_each_entry(p, &br->router_list, rlist) { 1162 if ((unsigned long) port >= (unsigned long) p) 1163 break; 1164 slot = &p->rlist; 1165 } 1166 1167 if (slot) 1168 hlist_add_after_rcu(slot, &port->rlist); 1169 else 1170 hlist_add_head_rcu(&port->rlist, &br->router_list); 1171 } 1172 1173 static void br_multicast_mark_router(struct net_bridge *br, 1174 struct net_bridge_port *port) 1175 { 1176 unsigned long now = jiffies; 1177 1178 if (!port) { 1179 if (br->multicast_router == 1) 1180 mod_timer(&br->multicast_router_timer, 1181 now + br->multicast_querier_interval); 1182 return; 1183 } 1184 1185 if (port->multicast_router != 1) 1186 return; 1187 1188 if (!hlist_unhashed(&port->rlist)) 1189 goto timer; 1190 1191 br_multicast_add_router(br, port); 1192 1193 timer: 1194 mod_timer(&port->multicast_router_timer, 1195 now + br->multicast_querier_interval); 1196 } 1197 1198 static void br_multicast_query_received(struct net_bridge *br, 1199 struct net_bridge_port *port, 1200 struct bridge_mcast_other_query *query, 1201 struct br_ip *saddr, 1202 unsigned long max_delay) 1203 { 1204 if (!br_multicast_select_querier(br, saddr)) 1205 return; 1206 1207 br_multicast_update_query_timer(br, query, max_delay); 1208 br_multicast_mark_router(br, port); 1209 } 1210 1211 static int br_ip4_multicast_query(struct net_bridge *br, 1212 struct net_bridge_port *port, 1213 struct sk_buff *skb, 1214 u16 vid) 1215 { 1216 const struct iphdr *iph = ip_hdr(skb); 1217 struct igmphdr *ih = igmp_hdr(skb); 1218 struct net_bridge_mdb_entry *mp; 1219 struct igmpv3_query *ih3; 1220 struct net_bridge_port_group *p; 1221 struct net_bridge_port_group __rcu **pp; 1222 struct br_ip saddr; 1223 unsigned long max_delay; 1224 unsigned long now = jiffies; 1225 __be32 group; 1226 int err = 0; 1227 1228 spin_lock(&br->multicast_lock); 1229 if (!netif_running(br->dev) || 1230 (port && port->state == BR_STATE_DISABLED)) 1231 goto out; 1232 1233 group = ih->group; 1234 1235 if (skb->len == sizeof(*ih)) { 1236 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 1237 1238 if (!max_delay) { 1239 max_delay = 10 * HZ; 1240 group = 0; 1241 } 1242 } else { 1243 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) { 1244 err = -EINVAL; 1245 goto out; 1246 } 1247 1248 ih3 = igmpv3_query_hdr(skb); 1249 if (ih3->nsrcs) 1250 goto out; 1251 1252 max_delay = ih3->code ? 1253 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 1254 } 1255 1256 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer 1257 * all-systems destination addresses (224.0.0.1) for general queries 1258 */ 1259 if (!group && iph->daddr != htonl(INADDR_ALLHOSTS_GROUP)) { 1260 err = -EINVAL; 1261 goto out; 1262 } 1263 1264 if (!group) { 1265 saddr.proto = htons(ETH_P_IP); 1266 saddr.u.ip4 = iph->saddr; 1267 1268 br_multicast_query_received(br, port, &br->ip4_other_query, 1269 &saddr, max_delay); 1270 goto out; 1271 } 1272 1273 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid); 1274 if (!mp) 1275 goto out; 1276 1277 max_delay *= br->multicast_last_member_count; 1278 1279 if (mp->mglist && 1280 (timer_pending(&mp->timer) ? 1281 time_after(mp->timer.expires, now + max_delay) : 1282 try_to_del_timer_sync(&mp->timer) >= 0)) 1283 mod_timer(&mp->timer, now + max_delay); 1284 1285 for (pp = &mp->ports; 1286 (p = mlock_dereference(*pp, br)) != NULL; 1287 pp = &p->next) { 1288 if (timer_pending(&p->timer) ? 1289 time_after(p->timer.expires, now + max_delay) : 1290 try_to_del_timer_sync(&p->timer) >= 0) 1291 mod_timer(&p->timer, now + max_delay); 1292 } 1293 1294 out: 1295 spin_unlock(&br->multicast_lock); 1296 return err; 1297 } 1298 1299 #if IS_ENABLED(CONFIG_IPV6) 1300 static int br_ip6_multicast_query(struct net_bridge *br, 1301 struct net_bridge_port *port, 1302 struct sk_buff *skb, 1303 u16 vid) 1304 { 1305 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 1306 struct mld_msg *mld; 1307 struct net_bridge_mdb_entry *mp; 1308 struct mld2_query *mld2q; 1309 struct net_bridge_port_group *p; 1310 struct net_bridge_port_group __rcu **pp; 1311 struct br_ip saddr; 1312 unsigned long max_delay; 1313 unsigned long now = jiffies; 1314 const struct in6_addr *group = NULL; 1315 bool is_general_query; 1316 int err = 0; 1317 1318 spin_lock(&br->multicast_lock); 1319 if (!netif_running(br->dev) || 1320 (port && port->state == BR_STATE_DISABLED)) 1321 goto out; 1322 1323 /* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */ 1324 if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) { 1325 err = -EINVAL; 1326 goto out; 1327 } 1328 1329 if (skb->len == sizeof(*mld)) { 1330 if (!pskb_may_pull(skb, sizeof(*mld))) { 1331 err = -EINVAL; 1332 goto out; 1333 } 1334 mld = (struct mld_msg *) icmp6_hdr(skb); 1335 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); 1336 if (max_delay) 1337 group = &mld->mld_mca; 1338 } else { 1339 if (!pskb_may_pull(skb, sizeof(*mld2q))) { 1340 err = -EINVAL; 1341 goto out; 1342 } 1343 mld2q = (struct mld2_query *)icmp6_hdr(skb); 1344 if (!mld2q->mld2q_nsrcs) 1345 group = &mld2q->mld2q_mca; 1346 1347 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); 1348 } 1349 1350 is_general_query = group && ipv6_addr_any(group); 1351 1352 /* RFC2710+RFC3810 (MLDv1+MLDv2) require the multicast link layer 1353 * all-nodes destination address (ff02::1) for general queries 1354 */ 1355 if (is_general_query && !ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) { 1356 err = -EINVAL; 1357 goto out; 1358 } 1359 1360 if (is_general_query) { 1361 saddr.proto = htons(ETH_P_IPV6); 1362 saddr.u.ip6 = ip6h->saddr; 1363 1364 br_multicast_query_received(br, port, &br->ip6_other_query, 1365 &saddr, max_delay); 1366 goto out; 1367 } 1368 1369 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid); 1370 if (!mp) 1371 goto out; 1372 1373 max_delay *= br->multicast_last_member_count; 1374 if (mp->mglist && 1375 (timer_pending(&mp->timer) ? 1376 time_after(mp->timer.expires, now + max_delay) : 1377 try_to_del_timer_sync(&mp->timer) >= 0)) 1378 mod_timer(&mp->timer, now + max_delay); 1379 1380 for (pp = &mp->ports; 1381 (p = mlock_dereference(*pp, br)) != NULL; 1382 pp = &p->next) { 1383 if (timer_pending(&p->timer) ? 1384 time_after(p->timer.expires, now + max_delay) : 1385 try_to_del_timer_sync(&p->timer) >= 0) 1386 mod_timer(&p->timer, now + max_delay); 1387 } 1388 1389 out: 1390 spin_unlock(&br->multicast_lock); 1391 return err; 1392 } 1393 #endif 1394 1395 static void 1396 br_multicast_leave_group(struct net_bridge *br, 1397 struct net_bridge_port *port, 1398 struct br_ip *group, 1399 struct bridge_mcast_other_query *other_query, 1400 struct bridge_mcast_own_query *own_query) 1401 { 1402 struct net_bridge_mdb_htable *mdb; 1403 struct net_bridge_mdb_entry *mp; 1404 struct net_bridge_port_group *p; 1405 unsigned long now; 1406 unsigned long time; 1407 1408 spin_lock(&br->multicast_lock); 1409 if (!netif_running(br->dev) || 1410 (port && port->state == BR_STATE_DISABLED) || 1411 timer_pending(&other_query->timer)) 1412 goto out; 1413 1414 mdb = mlock_dereference(br->mdb, br); 1415 mp = br_mdb_ip_get(mdb, group); 1416 if (!mp) 1417 goto out; 1418 1419 if (br->multicast_querier) { 1420 __br_multicast_send_query(br, port, &mp->addr); 1421 1422 time = jiffies + br->multicast_last_member_count * 1423 br->multicast_last_member_interval; 1424 1425 mod_timer(&own_query->timer, time); 1426 1427 for (p = mlock_dereference(mp->ports, br); 1428 p != NULL; 1429 p = mlock_dereference(p->next, br)) { 1430 if (p->port != port) 1431 continue; 1432 1433 if (!hlist_unhashed(&p->mglist) && 1434 (timer_pending(&p->timer) ? 1435 time_after(p->timer.expires, time) : 1436 try_to_del_timer_sync(&p->timer) >= 0)) { 1437 mod_timer(&p->timer, time); 1438 } 1439 1440 break; 1441 } 1442 } 1443 1444 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { 1445 struct net_bridge_port_group __rcu **pp; 1446 1447 for (pp = &mp->ports; 1448 (p = mlock_dereference(*pp, br)) != NULL; 1449 pp = &p->next) { 1450 if (p->port != port) 1451 continue; 1452 1453 rcu_assign_pointer(*pp, p->next); 1454 hlist_del_init(&p->mglist); 1455 del_timer(&p->timer); 1456 call_rcu_bh(&p->rcu, br_multicast_free_pg); 1457 br_mdb_notify(br->dev, port, group, RTM_DELMDB); 1458 1459 if (!mp->ports && !mp->mglist && 1460 netif_running(br->dev)) 1461 mod_timer(&mp->timer, jiffies); 1462 } 1463 goto out; 1464 } 1465 1466 now = jiffies; 1467 time = now + br->multicast_last_member_count * 1468 br->multicast_last_member_interval; 1469 1470 if (!port) { 1471 if (mp->mglist && 1472 (timer_pending(&mp->timer) ? 1473 time_after(mp->timer.expires, time) : 1474 try_to_del_timer_sync(&mp->timer) >= 0)) { 1475 mod_timer(&mp->timer, time); 1476 } 1477 1478 goto out; 1479 } 1480 1481 for (p = mlock_dereference(mp->ports, br); 1482 p != NULL; 1483 p = mlock_dereference(p->next, br)) { 1484 if (p->port != port) 1485 continue; 1486 1487 if (!hlist_unhashed(&p->mglist) && 1488 (timer_pending(&p->timer) ? 1489 time_after(p->timer.expires, time) : 1490 try_to_del_timer_sync(&p->timer) >= 0)) { 1491 mod_timer(&p->timer, time); 1492 } 1493 1494 break; 1495 } 1496 out: 1497 spin_unlock(&br->multicast_lock); 1498 } 1499 1500 static void br_ip4_multicast_leave_group(struct net_bridge *br, 1501 struct net_bridge_port *port, 1502 __be32 group, 1503 __u16 vid) 1504 { 1505 struct br_ip br_group; 1506 struct bridge_mcast_own_query *own_query; 1507 1508 if (ipv4_is_local_multicast(group)) 1509 return; 1510 1511 own_query = port ? &port->ip4_own_query : &br->ip4_own_query; 1512 1513 br_group.u.ip4 = group; 1514 br_group.proto = htons(ETH_P_IP); 1515 br_group.vid = vid; 1516 1517 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query, 1518 own_query); 1519 } 1520 1521 #if IS_ENABLED(CONFIG_IPV6) 1522 static void br_ip6_multicast_leave_group(struct net_bridge *br, 1523 struct net_bridge_port *port, 1524 const struct in6_addr *group, 1525 __u16 vid) 1526 { 1527 struct br_ip br_group; 1528 struct bridge_mcast_own_query *own_query; 1529 1530 if (ipv6_addr_is_ll_all_nodes(group)) 1531 return; 1532 1533 own_query = port ? &port->ip6_own_query : &br->ip6_own_query; 1534 1535 br_group.u.ip6 = *group; 1536 br_group.proto = htons(ETH_P_IPV6); 1537 br_group.vid = vid; 1538 1539 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query, 1540 own_query); 1541 } 1542 #endif 1543 1544 static int br_multicast_ipv4_rcv(struct net_bridge *br, 1545 struct net_bridge_port *port, 1546 struct sk_buff *skb, 1547 u16 vid) 1548 { 1549 struct sk_buff *skb2 = skb; 1550 const struct iphdr *iph; 1551 struct igmphdr *ih; 1552 unsigned int len; 1553 unsigned int offset; 1554 int err; 1555 1556 /* We treat OOM as packet loss for now. */ 1557 if (!pskb_may_pull(skb, sizeof(*iph))) 1558 return -EINVAL; 1559 1560 iph = ip_hdr(skb); 1561 1562 if (iph->ihl < 5 || iph->version != 4) 1563 return -EINVAL; 1564 1565 if (!pskb_may_pull(skb, ip_hdrlen(skb))) 1566 return -EINVAL; 1567 1568 iph = ip_hdr(skb); 1569 1570 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1571 return -EINVAL; 1572 1573 if (iph->protocol != IPPROTO_IGMP) { 1574 if (!ipv4_is_local_multicast(iph->daddr)) 1575 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1576 return 0; 1577 } 1578 1579 len = ntohs(iph->tot_len); 1580 if (skb->len < len || len < ip_hdrlen(skb)) 1581 return -EINVAL; 1582 1583 if (skb->len > len) { 1584 skb2 = skb_clone(skb, GFP_ATOMIC); 1585 if (!skb2) 1586 return -ENOMEM; 1587 1588 err = pskb_trim_rcsum(skb2, len); 1589 if (err) 1590 goto err_out; 1591 } 1592 1593 len -= ip_hdrlen(skb2); 1594 offset = skb_network_offset(skb2) + ip_hdrlen(skb2); 1595 __skb_pull(skb2, offset); 1596 skb_reset_transport_header(skb2); 1597 1598 err = -EINVAL; 1599 if (!pskb_may_pull(skb2, sizeof(*ih))) 1600 goto out; 1601 1602 switch (skb2->ip_summed) { 1603 case CHECKSUM_COMPLETE: 1604 if (!csum_fold(skb2->csum)) 1605 break; 1606 /* fall through */ 1607 case CHECKSUM_NONE: 1608 skb2->csum = 0; 1609 if (skb_checksum_complete(skb2)) 1610 goto out; 1611 } 1612 1613 err = 0; 1614 1615 BR_INPUT_SKB_CB(skb)->igmp = 1; 1616 ih = igmp_hdr(skb2); 1617 1618 switch (ih->type) { 1619 case IGMP_HOST_MEMBERSHIP_REPORT: 1620 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1621 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1622 err = br_ip4_multicast_add_group(br, port, ih->group, vid); 1623 break; 1624 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1625 err = br_ip4_multicast_igmp3_report(br, port, skb2, vid); 1626 break; 1627 case IGMP_HOST_MEMBERSHIP_QUERY: 1628 err = br_ip4_multicast_query(br, port, skb2, vid); 1629 break; 1630 case IGMP_HOST_LEAVE_MESSAGE: 1631 br_ip4_multicast_leave_group(br, port, ih->group, vid); 1632 break; 1633 } 1634 1635 out: 1636 __skb_push(skb2, offset); 1637 err_out: 1638 if (skb2 != skb) 1639 kfree_skb(skb2); 1640 return err; 1641 } 1642 1643 #if IS_ENABLED(CONFIG_IPV6) 1644 static int br_multicast_ipv6_rcv(struct net_bridge *br, 1645 struct net_bridge_port *port, 1646 struct sk_buff *skb, 1647 u16 vid) 1648 { 1649 struct sk_buff *skb2; 1650 const struct ipv6hdr *ip6h; 1651 u8 icmp6_type; 1652 u8 nexthdr; 1653 __be16 frag_off; 1654 unsigned int len; 1655 int offset; 1656 int err; 1657 1658 if (!pskb_may_pull(skb, sizeof(*ip6h))) 1659 return -EINVAL; 1660 1661 ip6h = ipv6_hdr(skb); 1662 1663 /* 1664 * We're interested in MLD messages only. 1665 * - Version is 6 1666 * - MLD has always Router Alert hop-by-hop option 1667 * - But we do not support jumbrograms. 1668 */ 1669 if (ip6h->version != 6) 1670 return 0; 1671 1672 /* Prevent flooding this packet if there is no listener present */ 1673 if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) 1674 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1675 1676 if (ip6h->nexthdr != IPPROTO_HOPOPTS || 1677 ip6h->payload_len == 0) 1678 return 0; 1679 1680 len = ntohs(ip6h->payload_len) + sizeof(*ip6h); 1681 if (skb->len < len) 1682 return -EINVAL; 1683 1684 nexthdr = ip6h->nexthdr; 1685 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off); 1686 1687 if (offset < 0 || nexthdr != IPPROTO_ICMPV6) 1688 return 0; 1689 1690 /* Okay, we found ICMPv6 header */ 1691 skb2 = skb_clone(skb, GFP_ATOMIC); 1692 if (!skb2) 1693 return -ENOMEM; 1694 1695 err = -EINVAL; 1696 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr))) 1697 goto out; 1698 1699 len -= offset - skb_network_offset(skb2); 1700 1701 __skb_pull(skb2, offset); 1702 skb_reset_transport_header(skb2); 1703 skb_postpull_rcsum(skb2, skb_network_header(skb2), 1704 skb_network_header_len(skb2)); 1705 1706 icmp6_type = icmp6_hdr(skb2)->icmp6_type; 1707 1708 switch (icmp6_type) { 1709 case ICMPV6_MGM_QUERY: 1710 case ICMPV6_MGM_REPORT: 1711 case ICMPV6_MGM_REDUCTION: 1712 case ICMPV6_MLD2_REPORT: 1713 break; 1714 default: 1715 err = 0; 1716 goto out; 1717 } 1718 1719 /* Okay, we found MLD message. Check further. */ 1720 if (skb2->len > len) { 1721 err = pskb_trim_rcsum(skb2, len); 1722 if (err) 1723 goto out; 1724 err = -EINVAL; 1725 } 1726 1727 ip6h = ipv6_hdr(skb2); 1728 1729 switch (skb2->ip_summed) { 1730 case CHECKSUM_COMPLETE: 1731 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len, 1732 IPPROTO_ICMPV6, skb2->csum)) 1733 break; 1734 /*FALLTHROUGH*/ 1735 case CHECKSUM_NONE: 1736 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, 1737 &ip6h->daddr, 1738 skb2->len, 1739 IPPROTO_ICMPV6, 0)); 1740 if (__skb_checksum_complete(skb2)) 1741 goto out; 1742 } 1743 1744 err = 0; 1745 1746 BR_INPUT_SKB_CB(skb)->igmp = 1; 1747 1748 switch (icmp6_type) { 1749 case ICMPV6_MGM_REPORT: 1750 { 1751 struct mld_msg *mld; 1752 if (!pskb_may_pull(skb2, sizeof(*mld))) { 1753 err = -EINVAL; 1754 goto out; 1755 } 1756 mld = (struct mld_msg *)skb_transport_header(skb2); 1757 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1758 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid); 1759 break; 1760 } 1761 case ICMPV6_MLD2_REPORT: 1762 err = br_ip6_multicast_mld2_report(br, port, skb2, vid); 1763 break; 1764 case ICMPV6_MGM_QUERY: 1765 err = br_ip6_multicast_query(br, port, skb2, vid); 1766 break; 1767 case ICMPV6_MGM_REDUCTION: 1768 { 1769 struct mld_msg *mld; 1770 if (!pskb_may_pull(skb2, sizeof(*mld))) { 1771 err = -EINVAL; 1772 goto out; 1773 } 1774 mld = (struct mld_msg *)skb_transport_header(skb2); 1775 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid); 1776 } 1777 } 1778 1779 out: 1780 kfree_skb(skb2); 1781 return err; 1782 } 1783 #endif 1784 1785 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 1786 struct sk_buff *skb, u16 vid) 1787 { 1788 BR_INPUT_SKB_CB(skb)->igmp = 0; 1789 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 1790 1791 if (br->multicast_disabled) 1792 return 0; 1793 1794 switch (skb->protocol) { 1795 case htons(ETH_P_IP): 1796 return br_multicast_ipv4_rcv(br, port, skb, vid); 1797 #if IS_ENABLED(CONFIG_IPV6) 1798 case htons(ETH_P_IPV6): 1799 return br_multicast_ipv6_rcv(br, port, skb, vid); 1800 #endif 1801 } 1802 1803 return 0; 1804 } 1805 1806 static void br_multicast_query_expired(struct net_bridge *br, 1807 struct bridge_mcast_own_query *query) 1808 { 1809 spin_lock(&br->multicast_lock); 1810 if (query->startup_sent < br->multicast_startup_query_count) 1811 query->startup_sent++; 1812 1813 br_multicast_send_query(br, NULL, query); 1814 spin_unlock(&br->multicast_lock); 1815 } 1816 1817 static void br_ip4_multicast_query_expired(unsigned long data) 1818 { 1819 struct net_bridge *br = (void *)data; 1820 1821 br_multicast_query_expired(br, &br->ip4_own_query); 1822 } 1823 1824 #if IS_ENABLED(CONFIG_IPV6) 1825 static void br_ip6_multicast_query_expired(unsigned long data) 1826 { 1827 struct net_bridge *br = (void *)data; 1828 1829 br_multicast_query_expired(br, &br->ip6_own_query); 1830 } 1831 #endif 1832 1833 void br_multicast_init(struct net_bridge *br) 1834 { 1835 br->hash_elasticity = 4; 1836 br->hash_max = 512; 1837 1838 br->multicast_router = 1; 1839 br->multicast_querier = 0; 1840 br->multicast_query_use_ifaddr = 0; 1841 br->multicast_last_member_count = 2; 1842 br->multicast_startup_query_count = 2; 1843 1844 br->multicast_last_member_interval = HZ; 1845 br->multicast_query_response_interval = 10 * HZ; 1846 br->multicast_startup_query_interval = 125 * HZ / 4; 1847 br->multicast_query_interval = 125 * HZ; 1848 br->multicast_querier_interval = 255 * HZ; 1849 br->multicast_membership_interval = 260 * HZ; 1850 1851 br->ip4_other_query.delay_time = 0; 1852 #if IS_ENABLED(CONFIG_IPV6) 1853 br->ip6_other_query.delay_time = 0; 1854 #endif 1855 1856 spin_lock_init(&br->multicast_lock); 1857 setup_timer(&br->multicast_router_timer, 1858 br_multicast_local_router_expired, 0); 1859 setup_timer(&br->ip4_other_query.timer, 1860 br_ip4_multicast_querier_expired, (unsigned long)br); 1861 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired, 1862 (unsigned long)br); 1863 #if IS_ENABLED(CONFIG_IPV6) 1864 setup_timer(&br->ip6_other_query.timer, 1865 br_ip6_multicast_querier_expired, (unsigned long)br); 1866 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired, 1867 (unsigned long)br); 1868 #endif 1869 } 1870 1871 static void __br_multicast_open(struct net_bridge *br, 1872 struct bridge_mcast_own_query *query) 1873 { 1874 query->startup_sent = 0; 1875 1876 if (br->multicast_disabled) 1877 return; 1878 1879 mod_timer(&query->timer, jiffies); 1880 } 1881 1882 void br_multicast_open(struct net_bridge *br) 1883 { 1884 __br_multicast_open(br, &br->ip4_own_query); 1885 #if IS_ENABLED(CONFIG_IPV6) 1886 __br_multicast_open(br, &br->ip6_own_query); 1887 #endif 1888 } 1889 1890 void br_multicast_stop(struct net_bridge *br) 1891 { 1892 struct net_bridge_mdb_htable *mdb; 1893 struct net_bridge_mdb_entry *mp; 1894 struct hlist_node *n; 1895 u32 ver; 1896 int i; 1897 1898 del_timer_sync(&br->multicast_router_timer); 1899 del_timer_sync(&br->ip4_other_query.timer); 1900 del_timer_sync(&br->ip4_own_query.timer); 1901 #if IS_ENABLED(CONFIG_IPV6) 1902 del_timer_sync(&br->ip6_other_query.timer); 1903 del_timer_sync(&br->ip6_own_query.timer); 1904 #endif 1905 1906 spin_lock_bh(&br->multicast_lock); 1907 mdb = mlock_dereference(br->mdb, br); 1908 if (!mdb) 1909 goto out; 1910 1911 br->mdb = NULL; 1912 1913 ver = mdb->ver; 1914 for (i = 0; i < mdb->max; i++) { 1915 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i], 1916 hlist[ver]) { 1917 del_timer(&mp->timer); 1918 call_rcu_bh(&mp->rcu, br_multicast_free_group); 1919 } 1920 } 1921 1922 if (mdb->old) { 1923 spin_unlock_bh(&br->multicast_lock); 1924 rcu_barrier_bh(); 1925 spin_lock_bh(&br->multicast_lock); 1926 WARN_ON(mdb->old); 1927 } 1928 1929 mdb->old = mdb; 1930 call_rcu_bh(&mdb->rcu, br_mdb_free); 1931 1932 out: 1933 spin_unlock_bh(&br->multicast_lock); 1934 } 1935 1936 int br_multicast_set_router(struct net_bridge *br, unsigned long val) 1937 { 1938 int err = -ENOENT; 1939 1940 spin_lock_bh(&br->multicast_lock); 1941 if (!netif_running(br->dev)) 1942 goto unlock; 1943 1944 switch (val) { 1945 case 0: 1946 case 2: 1947 del_timer(&br->multicast_router_timer); 1948 /* fall through */ 1949 case 1: 1950 br->multicast_router = val; 1951 err = 0; 1952 break; 1953 1954 default: 1955 err = -EINVAL; 1956 break; 1957 } 1958 1959 unlock: 1960 spin_unlock_bh(&br->multicast_lock); 1961 1962 return err; 1963 } 1964 1965 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) 1966 { 1967 struct net_bridge *br = p->br; 1968 int err = -ENOENT; 1969 1970 spin_lock(&br->multicast_lock); 1971 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) 1972 goto unlock; 1973 1974 switch (val) { 1975 case 0: 1976 case 1: 1977 case 2: 1978 p->multicast_router = val; 1979 err = 0; 1980 1981 if (val < 2 && !hlist_unhashed(&p->rlist)) 1982 hlist_del_init_rcu(&p->rlist); 1983 1984 if (val == 1) 1985 break; 1986 1987 del_timer(&p->multicast_router_timer); 1988 1989 if (val == 0) 1990 break; 1991 1992 br_multicast_add_router(br, p); 1993 break; 1994 1995 default: 1996 err = -EINVAL; 1997 break; 1998 } 1999 2000 unlock: 2001 spin_unlock(&br->multicast_lock); 2002 2003 return err; 2004 } 2005 2006 static void br_multicast_start_querier(struct net_bridge *br, 2007 struct bridge_mcast_own_query *query) 2008 { 2009 struct net_bridge_port *port; 2010 2011 __br_multicast_open(br, query); 2012 2013 list_for_each_entry(port, &br->port_list, list) { 2014 if (port->state == BR_STATE_DISABLED || 2015 port->state == BR_STATE_BLOCKING) 2016 continue; 2017 2018 if (query == &br->ip4_own_query) 2019 br_multicast_enable(&port->ip4_own_query); 2020 #if IS_ENABLED(CONFIG_IPV6) 2021 else 2022 br_multicast_enable(&port->ip6_own_query); 2023 #endif 2024 } 2025 } 2026 2027 int br_multicast_toggle(struct net_bridge *br, unsigned long val) 2028 { 2029 int err = 0; 2030 struct net_bridge_mdb_htable *mdb; 2031 2032 spin_lock_bh(&br->multicast_lock); 2033 if (br->multicast_disabled == !val) 2034 goto unlock; 2035 2036 br->multicast_disabled = !val; 2037 if (br->multicast_disabled) 2038 goto unlock; 2039 2040 if (!netif_running(br->dev)) 2041 goto unlock; 2042 2043 mdb = mlock_dereference(br->mdb, br); 2044 if (mdb) { 2045 if (mdb->old) { 2046 err = -EEXIST; 2047 rollback: 2048 br->multicast_disabled = !!val; 2049 goto unlock; 2050 } 2051 2052 err = br_mdb_rehash(&br->mdb, mdb->max, 2053 br->hash_elasticity); 2054 if (err) 2055 goto rollback; 2056 } 2057 2058 br_multicast_start_querier(br, &br->ip4_own_query); 2059 #if IS_ENABLED(CONFIG_IPV6) 2060 br_multicast_start_querier(br, &br->ip6_own_query); 2061 #endif 2062 2063 unlock: 2064 spin_unlock_bh(&br->multicast_lock); 2065 2066 return err; 2067 } 2068 2069 int br_multicast_set_querier(struct net_bridge *br, unsigned long val) 2070 { 2071 unsigned long max_delay; 2072 2073 val = !!val; 2074 2075 spin_lock_bh(&br->multicast_lock); 2076 if (br->multicast_querier == val) 2077 goto unlock; 2078 2079 br->multicast_querier = val; 2080 if (!val) 2081 goto unlock; 2082 2083 max_delay = br->multicast_query_response_interval; 2084 2085 if (!timer_pending(&br->ip4_other_query.timer)) 2086 br->ip4_other_query.delay_time = jiffies + max_delay; 2087 2088 br_multicast_start_querier(br, &br->ip4_own_query); 2089 2090 #if IS_ENABLED(CONFIG_IPV6) 2091 if (!timer_pending(&br->ip6_other_query.timer)) 2092 br->ip6_other_query.delay_time = jiffies + max_delay; 2093 2094 br_multicast_start_querier(br, &br->ip6_own_query); 2095 #endif 2096 2097 unlock: 2098 spin_unlock_bh(&br->multicast_lock); 2099 2100 return 0; 2101 } 2102 2103 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) 2104 { 2105 int err = -ENOENT; 2106 u32 old; 2107 struct net_bridge_mdb_htable *mdb; 2108 2109 spin_lock_bh(&br->multicast_lock); 2110 if (!netif_running(br->dev)) 2111 goto unlock; 2112 2113 err = -EINVAL; 2114 if (!is_power_of_2(val)) 2115 goto unlock; 2116 2117 mdb = mlock_dereference(br->mdb, br); 2118 if (mdb && val < mdb->size) 2119 goto unlock; 2120 2121 err = 0; 2122 2123 old = br->hash_max; 2124 br->hash_max = val; 2125 2126 if (mdb) { 2127 if (mdb->old) { 2128 err = -EEXIST; 2129 rollback: 2130 br->hash_max = old; 2131 goto unlock; 2132 } 2133 2134 err = br_mdb_rehash(&br->mdb, br->hash_max, 2135 br->hash_elasticity); 2136 if (err) 2137 goto rollback; 2138 } 2139 2140 unlock: 2141 spin_unlock_bh(&br->multicast_lock); 2142 2143 return err; 2144 } 2145 2146 /** 2147 * br_multicast_list_adjacent - Returns snooped multicast addresses 2148 * @dev: The bridge port adjacent to which to retrieve addresses 2149 * @br_ip_list: The list to store found, snooped multicast IP addresses in 2150 * 2151 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast 2152 * snooping feature on all bridge ports of dev's bridge device, excluding 2153 * the addresses from dev itself. 2154 * 2155 * Returns the number of items added to br_ip_list. 2156 * 2157 * Notes: 2158 * - br_ip_list needs to be initialized by caller 2159 * - br_ip_list might contain duplicates in the end 2160 * (needs to be taken care of by caller) 2161 * - br_ip_list needs to be freed by caller 2162 */ 2163 int br_multicast_list_adjacent(struct net_device *dev, 2164 struct list_head *br_ip_list) 2165 { 2166 struct net_bridge *br; 2167 struct net_bridge_port *port; 2168 struct net_bridge_port_group *group; 2169 struct br_ip_list *entry; 2170 int count = 0; 2171 2172 rcu_read_lock(); 2173 if (!br_ip_list || !br_port_exists(dev)) 2174 goto unlock; 2175 2176 port = br_port_get_rcu(dev); 2177 if (!port || !port->br) 2178 goto unlock; 2179 2180 br = port->br; 2181 2182 list_for_each_entry_rcu(port, &br->port_list, list) { 2183 if (!port->dev || port->dev == dev) 2184 continue; 2185 2186 hlist_for_each_entry_rcu(group, &port->mglist, mglist) { 2187 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 2188 if (!entry) 2189 goto unlock; 2190 2191 entry->addr = group->addr; 2192 list_add(&entry->list, br_ip_list); 2193 count++; 2194 } 2195 } 2196 2197 unlock: 2198 rcu_read_unlock(); 2199 return count; 2200 } 2201 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); 2202