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 static void br_multicast_add_router(struct net_bridge *br, 41 struct net_bridge_port *port); 42 static void br_ip4_multicast_leave_group(struct net_bridge *br, 43 struct net_bridge_port *port, 44 __be32 group, 45 __u16 vid); 46 #if IS_ENABLED(CONFIG_IPV6) 47 static void br_ip6_multicast_leave_group(struct net_bridge *br, 48 struct net_bridge_port *port, 49 const struct in6_addr *group, 50 __u16 vid); 51 #endif 52 unsigned int br_mdb_rehash_seq; 53 54 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) 55 { 56 if (a->proto != b->proto) 57 return 0; 58 if (a->vid != b->vid) 59 return 0; 60 switch (a->proto) { 61 case htons(ETH_P_IP): 62 return a->u.ip4 == b->u.ip4; 63 #if IS_ENABLED(CONFIG_IPV6) 64 case htons(ETH_P_IPV6): 65 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); 66 #endif 67 } 68 return 0; 69 } 70 71 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip, 72 __u16 vid) 73 { 74 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1); 75 } 76 77 #if IS_ENABLED(CONFIG_IPV6) 78 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, 79 const struct in6_addr *ip, 80 __u16 vid) 81 { 82 return jhash_2words(ipv6_addr_hash(ip), vid, 83 mdb->secret) & (mdb->max - 1); 84 } 85 #endif 86 87 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, 88 struct br_ip *ip) 89 { 90 switch (ip->proto) { 91 case htons(ETH_P_IP): 92 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid); 93 #if IS_ENABLED(CONFIG_IPV6) 94 case htons(ETH_P_IPV6): 95 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid); 96 #endif 97 } 98 return 0; 99 } 100 101 static struct net_bridge_mdb_entry *__br_mdb_ip_get( 102 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) 103 { 104 struct net_bridge_mdb_entry *mp; 105 106 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) { 107 if (br_ip_equal(&mp->addr, dst)) 108 return mp; 109 } 110 111 return NULL; 112 } 113 114 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, 115 struct br_ip *dst) 116 { 117 if (!mdb) 118 return NULL; 119 120 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); 121 } 122 123 static struct net_bridge_mdb_entry *br_mdb_ip4_get( 124 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid) 125 { 126 struct br_ip br_dst; 127 128 br_dst.u.ip4 = dst; 129 br_dst.proto = htons(ETH_P_IP); 130 br_dst.vid = vid; 131 132 return br_mdb_ip_get(mdb, &br_dst); 133 } 134 135 #if IS_ENABLED(CONFIG_IPV6) 136 static struct net_bridge_mdb_entry *br_mdb_ip6_get( 137 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst, 138 __u16 vid) 139 { 140 struct br_ip br_dst; 141 142 br_dst.u.ip6 = *dst; 143 br_dst.proto = htons(ETH_P_IPV6); 144 br_dst.vid = vid; 145 146 return br_mdb_ip_get(mdb, &br_dst); 147 } 148 #endif 149 150 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 151 struct sk_buff *skb, u16 vid) 152 { 153 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb); 154 struct br_ip ip; 155 156 if (br->multicast_disabled) 157 return NULL; 158 159 if (BR_INPUT_SKB_CB(skb)->igmp) 160 return NULL; 161 162 ip.proto = skb->protocol; 163 ip.vid = vid; 164 165 switch (skb->protocol) { 166 case htons(ETH_P_IP): 167 ip.u.ip4 = ip_hdr(skb)->daddr; 168 break; 169 #if IS_ENABLED(CONFIG_IPV6) 170 case htons(ETH_P_IPV6): 171 ip.u.ip6 = ipv6_hdr(skb)->daddr; 172 break; 173 #endif 174 default: 175 return NULL; 176 } 177 178 return br_mdb_ip_get(mdb, &ip); 179 } 180 181 static void br_mdb_free(struct rcu_head *head) 182 { 183 struct net_bridge_mdb_htable *mdb = 184 container_of(head, struct net_bridge_mdb_htable, rcu); 185 struct net_bridge_mdb_htable *old = mdb->old; 186 187 mdb->old = NULL; 188 kfree(old->mhash); 189 kfree(old); 190 } 191 192 static int br_mdb_copy(struct net_bridge_mdb_htable *new, 193 struct net_bridge_mdb_htable *old, 194 int elasticity) 195 { 196 struct net_bridge_mdb_entry *mp; 197 int maxlen; 198 int len; 199 int i; 200 201 for (i = 0; i < old->max; i++) 202 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver]) 203 hlist_add_head(&mp->hlist[new->ver], 204 &new->mhash[br_ip_hash(new, &mp->addr)]); 205 206 if (!elasticity) 207 return 0; 208 209 maxlen = 0; 210 for (i = 0; i < new->max; i++) { 211 len = 0; 212 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver]) 213 len++; 214 if (len > maxlen) 215 maxlen = len; 216 } 217 218 return maxlen > elasticity ? -EINVAL : 0; 219 } 220 221 void br_multicast_free_pg(struct rcu_head *head) 222 { 223 struct net_bridge_port_group *p = 224 container_of(head, struct net_bridge_port_group, rcu); 225 226 kfree(p); 227 } 228 229 static void br_multicast_free_group(struct rcu_head *head) 230 { 231 struct net_bridge_mdb_entry *mp = 232 container_of(head, struct net_bridge_mdb_entry, rcu); 233 234 kfree(mp); 235 } 236 237 static void br_multicast_group_expired(unsigned long data) 238 { 239 struct net_bridge_mdb_entry *mp = (void *)data; 240 struct net_bridge *br = mp->br; 241 struct net_bridge_mdb_htable *mdb; 242 243 spin_lock(&br->multicast_lock); 244 if (!netif_running(br->dev) || timer_pending(&mp->timer)) 245 goto out; 246 247 mp->mglist = false; 248 249 if (mp->ports) 250 goto out; 251 252 mdb = mlock_dereference(br->mdb, br); 253 254 hlist_del_rcu(&mp->hlist[mdb->ver]); 255 mdb->size--; 256 257 call_rcu_bh(&mp->rcu, br_multicast_free_group); 258 259 out: 260 spin_unlock(&br->multicast_lock); 261 } 262 263 static void br_multicast_del_pg(struct net_bridge *br, 264 struct net_bridge_port_group *pg) 265 { 266 struct net_bridge_mdb_htable *mdb; 267 struct net_bridge_mdb_entry *mp; 268 struct net_bridge_port_group *p; 269 struct net_bridge_port_group __rcu **pp; 270 271 mdb = mlock_dereference(br->mdb, br); 272 273 mp = br_mdb_ip_get(mdb, &pg->addr); 274 if (WARN_ON(!mp)) 275 return; 276 277 for (pp = &mp->ports; 278 (p = mlock_dereference(*pp, br)) != NULL; 279 pp = &p->next) { 280 if (p != pg) 281 continue; 282 283 rcu_assign_pointer(*pp, p->next); 284 hlist_del_init(&p->mglist); 285 del_timer(&p->timer); 286 br_mdb_notify(br->dev, p, RTM_DELMDB); 287 call_rcu_bh(&p->rcu, br_multicast_free_pg); 288 289 if (!mp->ports && !mp->mglist && 290 netif_running(br->dev)) 291 mod_timer(&mp->timer, jiffies); 292 293 return; 294 } 295 296 WARN_ON(1); 297 } 298 299 static void br_multicast_port_group_expired(unsigned long data) 300 { 301 struct net_bridge_port_group *pg = (void *)data; 302 struct net_bridge *br = pg->port->br; 303 304 spin_lock(&br->multicast_lock); 305 if (!netif_running(br->dev) || timer_pending(&pg->timer) || 306 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT) 307 goto out; 308 309 br_multicast_del_pg(br, pg); 310 311 out: 312 spin_unlock(&br->multicast_lock); 313 } 314 315 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, 316 int elasticity) 317 { 318 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); 319 struct net_bridge_mdb_htable *mdb; 320 int err; 321 322 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); 323 if (!mdb) 324 return -ENOMEM; 325 326 mdb->max = max; 327 mdb->old = old; 328 329 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); 330 if (!mdb->mhash) { 331 kfree(mdb); 332 return -ENOMEM; 333 } 334 335 mdb->size = old ? old->size : 0; 336 mdb->ver = old ? old->ver ^ 1 : 0; 337 338 if (!old || elasticity) 339 get_random_bytes(&mdb->secret, sizeof(mdb->secret)); 340 else 341 mdb->secret = old->secret; 342 343 if (!old) 344 goto out; 345 346 err = br_mdb_copy(mdb, old, elasticity); 347 if (err) { 348 kfree(mdb->mhash); 349 kfree(mdb); 350 return err; 351 } 352 353 br_mdb_rehash_seq++; 354 call_rcu_bh(&mdb->rcu, br_mdb_free); 355 356 out: 357 rcu_assign_pointer(*mdbp, mdb); 358 359 return 0; 360 } 361 362 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, 363 __be32 group) 364 { 365 struct sk_buff *skb; 366 struct igmphdr *ih; 367 struct ethhdr *eth; 368 struct iphdr *iph; 369 370 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + 371 sizeof(*ih) + 4); 372 if (!skb) 373 goto out; 374 375 skb->protocol = htons(ETH_P_IP); 376 377 skb_reset_mac_header(skb); 378 eth = eth_hdr(skb); 379 380 ether_addr_copy(eth->h_source, br->dev->dev_addr); 381 eth->h_dest[0] = 1; 382 eth->h_dest[1] = 0; 383 eth->h_dest[2] = 0x5e; 384 eth->h_dest[3] = 0; 385 eth->h_dest[4] = 0; 386 eth->h_dest[5] = 1; 387 eth->h_proto = htons(ETH_P_IP); 388 skb_put(skb, sizeof(*eth)); 389 390 skb_set_network_header(skb, skb->len); 391 iph = ip_hdr(skb); 392 393 iph->version = 4; 394 iph->ihl = 6; 395 iph->tos = 0xc0; 396 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); 397 iph->id = 0; 398 iph->frag_off = htons(IP_DF); 399 iph->ttl = 1; 400 iph->protocol = IPPROTO_IGMP; 401 iph->saddr = br->multicast_query_use_ifaddr ? 402 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0; 403 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); 404 ((u8 *)&iph[1])[0] = IPOPT_RA; 405 ((u8 *)&iph[1])[1] = 4; 406 ((u8 *)&iph[1])[2] = 0; 407 ((u8 *)&iph[1])[3] = 0; 408 ip_send_check(iph); 409 skb_put(skb, 24); 410 411 skb_set_transport_header(skb, skb->len); 412 ih = igmp_hdr(skb); 413 ih->type = IGMP_HOST_MEMBERSHIP_QUERY; 414 ih->code = (group ? br->multicast_last_member_interval : 415 br->multicast_query_response_interval) / 416 (HZ / IGMP_TIMER_SCALE); 417 ih->group = group; 418 ih->csum = 0; 419 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 420 skb_put(skb, sizeof(*ih)); 421 422 __skb_pull(skb, sizeof(*eth)); 423 424 out: 425 return skb; 426 } 427 428 #if IS_ENABLED(CONFIG_IPV6) 429 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, 430 const struct in6_addr *group) 431 { 432 struct sk_buff *skb; 433 struct ipv6hdr *ip6h; 434 struct mld_msg *mldq; 435 struct ethhdr *eth; 436 u8 *hopopt; 437 unsigned long interval; 438 439 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + 440 8 + sizeof(*mldq)); 441 if (!skb) 442 goto out; 443 444 skb->protocol = htons(ETH_P_IPV6); 445 446 /* Ethernet header */ 447 skb_reset_mac_header(skb); 448 eth = eth_hdr(skb); 449 450 ether_addr_copy(eth->h_source, br->dev->dev_addr); 451 eth->h_proto = htons(ETH_P_IPV6); 452 skb_put(skb, sizeof(*eth)); 453 454 /* IPv6 header + HbH option */ 455 skb_set_network_header(skb, skb->len); 456 ip6h = ipv6_hdr(skb); 457 458 *(__force __be32 *)ip6h = htonl(0x60000000); 459 ip6h->payload_len = htons(8 + sizeof(*mldq)); 460 ip6h->nexthdr = IPPROTO_HOPOPTS; 461 ip6h->hop_limit = 1; 462 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); 463 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, 464 &ip6h->saddr)) { 465 kfree_skb(skb); 466 return NULL; 467 } 468 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 469 470 hopopt = (u8 *)(ip6h + 1); 471 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ 472 hopopt[1] = 0; /* length of HbH */ 473 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ 474 hopopt[3] = 2; /* Length of RA Option */ 475 hopopt[4] = 0; /* Type = 0x0000 (MLD) */ 476 hopopt[5] = 0; 477 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ 478 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ 479 480 skb_put(skb, sizeof(*ip6h) + 8); 481 482 /* ICMPv6 */ 483 skb_set_transport_header(skb, skb->len); 484 mldq = (struct mld_msg *) icmp6_hdr(skb); 485 486 interval = ipv6_addr_any(group) ? 487 br->multicast_query_response_interval : 488 br->multicast_last_member_interval; 489 490 mldq->mld_type = ICMPV6_MGM_QUERY; 491 mldq->mld_code = 0; 492 mldq->mld_cksum = 0; 493 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); 494 mldq->mld_reserved = 0; 495 mldq->mld_mca = *group; 496 497 /* checksum */ 498 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 499 sizeof(*mldq), IPPROTO_ICMPV6, 500 csum_partial(mldq, 501 sizeof(*mldq), 0)); 502 skb_put(skb, sizeof(*mldq)); 503 504 __skb_pull(skb, sizeof(*eth)); 505 506 out: 507 return skb; 508 } 509 #endif 510 511 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, 512 struct br_ip *addr) 513 { 514 switch (addr->proto) { 515 case htons(ETH_P_IP): 516 return br_ip4_multicast_alloc_query(br, addr->u.ip4); 517 #if IS_ENABLED(CONFIG_IPV6) 518 case htons(ETH_P_IPV6): 519 return br_ip6_multicast_alloc_query(br, &addr->u.ip6); 520 #endif 521 } 522 return NULL; 523 } 524 525 static struct net_bridge_mdb_entry *br_multicast_get_group( 526 struct net_bridge *br, struct net_bridge_port *port, 527 struct br_ip *group, int hash) 528 { 529 struct net_bridge_mdb_htable *mdb; 530 struct net_bridge_mdb_entry *mp; 531 unsigned int count = 0; 532 unsigned int max; 533 int elasticity; 534 int err; 535 536 mdb = rcu_dereference_protected(br->mdb, 1); 537 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) { 538 count++; 539 if (unlikely(br_ip_equal(group, &mp->addr))) 540 return mp; 541 } 542 543 elasticity = 0; 544 max = mdb->max; 545 546 if (unlikely(count > br->hash_elasticity && count)) { 547 if (net_ratelimit()) 548 br_info(br, "Multicast hash table " 549 "chain limit reached: %s\n", 550 port ? port->dev->name : br->dev->name); 551 552 elasticity = br->hash_elasticity; 553 } 554 555 if (mdb->size >= max) { 556 max *= 2; 557 if (unlikely(max > br->hash_max)) { 558 br_warn(br, "Multicast hash table maximum of %d " 559 "reached, disabling snooping: %s\n", 560 br->hash_max, 561 port ? port->dev->name : br->dev->name); 562 err = -E2BIG; 563 disable: 564 br->multicast_disabled = 1; 565 goto err; 566 } 567 } 568 569 if (max > mdb->max || elasticity) { 570 if (mdb->old) { 571 if (net_ratelimit()) 572 br_info(br, "Multicast hash table " 573 "on fire: %s\n", 574 port ? port->dev->name : br->dev->name); 575 err = -EEXIST; 576 goto err; 577 } 578 579 err = br_mdb_rehash(&br->mdb, max, elasticity); 580 if (err) { 581 br_warn(br, "Cannot rehash multicast " 582 "hash table, disabling snooping: %s, %d, %d\n", 583 port ? port->dev->name : br->dev->name, 584 mdb->size, err); 585 goto disable; 586 } 587 588 err = -EAGAIN; 589 goto err; 590 } 591 592 return NULL; 593 594 err: 595 mp = ERR_PTR(err); 596 return mp; 597 } 598 599 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, 600 struct net_bridge_port *port, struct br_ip *group) 601 { 602 struct net_bridge_mdb_htable *mdb; 603 struct net_bridge_mdb_entry *mp; 604 int hash; 605 int err; 606 607 mdb = rcu_dereference_protected(br->mdb, 1); 608 if (!mdb) { 609 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); 610 if (err) 611 return ERR_PTR(err); 612 goto rehash; 613 } 614 615 hash = br_ip_hash(mdb, group); 616 mp = br_multicast_get_group(br, port, group, hash); 617 switch (PTR_ERR(mp)) { 618 case 0: 619 break; 620 621 case -EAGAIN: 622 rehash: 623 mdb = rcu_dereference_protected(br->mdb, 1); 624 hash = br_ip_hash(mdb, group); 625 break; 626 627 default: 628 goto out; 629 } 630 631 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 632 if (unlikely(!mp)) 633 return ERR_PTR(-ENOMEM); 634 635 mp->br = br; 636 mp->addr = *group; 637 setup_timer(&mp->timer, br_multicast_group_expired, 638 (unsigned long)mp); 639 640 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); 641 mdb->size++; 642 643 out: 644 return mp; 645 } 646 647 struct net_bridge_port_group *br_multicast_new_port_group( 648 struct net_bridge_port *port, 649 struct br_ip *group, 650 struct net_bridge_port_group __rcu *next, 651 unsigned char flags) 652 { 653 struct net_bridge_port_group *p; 654 655 p = kzalloc(sizeof(*p), GFP_ATOMIC); 656 if (unlikely(!p)) 657 return NULL; 658 659 p->addr = *group; 660 p->port = port; 661 p->flags = flags; 662 rcu_assign_pointer(p->next, next); 663 hlist_add_head(&p->mglist, &port->mglist); 664 setup_timer(&p->timer, br_multicast_port_group_expired, 665 (unsigned long)p); 666 return p; 667 } 668 669 static int br_multicast_add_group(struct net_bridge *br, 670 struct net_bridge_port *port, 671 struct br_ip *group) 672 { 673 struct net_bridge_mdb_entry *mp; 674 struct net_bridge_port_group *p; 675 struct net_bridge_port_group __rcu **pp; 676 unsigned long now = jiffies; 677 int err; 678 679 spin_lock(&br->multicast_lock); 680 if (!netif_running(br->dev) || 681 (port && port->state == BR_STATE_DISABLED)) 682 goto out; 683 684 mp = br_multicast_new_group(br, port, group); 685 err = PTR_ERR(mp); 686 if (IS_ERR(mp)) 687 goto err; 688 689 if (!port) { 690 mp->mglist = true; 691 mod_timer(&mp->timer, now + br->multicast_membership_interval); 692 goto out; 693 } 694 695 for (pp = &mp->ports; 696 (p = mlock_dereference(*pp, br)) != NULL; 697 pp = &p->next) { 698 if (p->port == port) 699 goto found; 700 if ((unsigned long)p->port < (unsigned long)port) 701 break; 702 } 703 704 p = br_multicast_new_port_group(port, group, *pp, 0); 705 if (unlikely(!p)) 706 goto err; 707 rcu_assign_pointer(*pp, p); 708 br_mdb_notify(br->dev, p, RTM_NEWMDB); 709 710 found: 711 mod_timer(&p->timer, now + br->multicast_membership_interval); 712 out: 713 err = 0; 714 715 err: 716 spin_unlock(&br->multicast_lock); 717 return err; 718 } 719 720 static int br_ip4_multicast_add_group(struct net_bridge *br, 721 struct net_bridge_port *port, 722 __be32 group, 723 __u16 vid) 724 { 725 struct br_ip br_group; 726 727 if (ipv4_is_local_multicast(group)) 728 return 0; 729 730 br_group.u.ip4 = group; 731 br_group.proto = htons(ETH_P_IP); 732 br_group.vid = vid; 733 734 return br_multicast_add_group(br, port, &br_group); 735 } 736 737 #if IS_ENABLED(CONFIG_IPV6) 738 static int br_ip6_multicast_add_group(struct net_bridge *br, 739 struct net_bridge_port *port, 740 const struct in6_addr *group, 741 __u16 vid) 742 { 743 struct br_ip br_group; 744 745 if (ipv6_addr_is_ll_all_nodes(group)) 746 return 0; 747 748 br_group.u.ip6 = *group; 749 br_group.proto = htons(ETH_P_IPV6); 750 br_group.vid = vid; 751 752 return br_multicast_add_group(br, port, &br_group); 753 } 754 #endif 755 756 static void br_multicast_router_expired(unsigned long data) 757 { 758 struct net_bridge_port *port = (void *)data; 759 struct net_bridge *br = port->br; 760 761 spin_lock(&br->multicast_lock); 762 if (port->multicast_router == MDB_RTR_TYPE_DISABLED || 763 port->multicast_router == MDB_RTR_TYPE_PERM || 764 timer_pending(&port->multicast_router_timer) || 765 hlist_unhashed(&port->rlist)) 766 goto out; 767 768 hlist_del_init_rcu(&port->rlist); 769 br_rtr_notify(br->dev, port, RTM_DELMDB); 770 /* Don't allow timer refresh if the router expired */ 771 if (port->multicast_router == MDB_RTR_TYPE_TEMP) 772 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 773 774 out: 775 spin_unlock(&br->multicast_lock); 776 } 777 778 static void br_multicast_local_router_expired(unsigned long data) 779 { 780 } 781 782 static void br_multicast_querier_expired(struct net_bridge *br, 783 struct bridge_mcast_own_query *query) 784 { 785 spin_lock(&br->multicast_lock); 786 if (!netif_running(br->dev) || br->multicast_disabled) 787 goto out; 788 789 br_multicast_start_querier(br, query); 790 791 out: 792 spin_unlock(&br->multicast_lock); 793 } 794 795 static void br_ip4_multicast_querier_expired(unsigned long data) 796 { 797 struct net_bridge *br = (void *)data; 798 799 br_multicast_querier_expired(br, &br->ip4_own_query); 800 } 801 802 #if IS_ENABLED(CONFIG_IPV6) 803 static void br_ip6_multicast_querier_expired(unsigned long data) 804 { 805 struct net_bridge *br = (void *)data; 806 807 br_multicast_querier_expired(br, &br->ip6_own_query); 808 } 809 #endif 810 811 static void br_multicast_select_own_querier(struct net_bridge *br, 812 struct br_ip *ip, 813 struct sk_buff *skb) 814 { 815 if (ip->proto == htons(ETH_P_IP)) 816 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr; 817 #if IS_ENABLED(CONFIG_IPV6) 818 else 819 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr; 820 #endif 821 } 822 823 static void __br_multicast_send_query(struct net_bridge *br, 824 struct net_bridge_port *port, 825 struct br_ip *ip) 826 { 827 struct sk_buff *skb; 828 829 skb = br_multicast_alloc_query(br, ip); 830 if (!skb) 831 return; 832 833 if (port) { 834 skb->dev = port->dev; 835 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, 836 dev_net(port->dev), NULL, skb, NULL, skb->dev, 837 br_dev_queue_push_xmit); 838 } else { 839 br_multicast_select_own_querier(br, ip, skb); 840 netif_rx(skb); 841 } 842 } 843 844 static void br_multicast_send_query(struct net_bridge *br, 845 struct net_bridge_port *port, 846 struct bridge_mcast_own_query *own_query) 847 { 848 unsigned long time; 849 struct br_ip br_group; 850 struct bridge_mcast_other_query *other_query = NULL; 851 852 if (!netif_running(br->dev) || br->multicast_disabled || 853 !br->multicast_querier) 854 return; 855 856 memset(&br_group.u, 0, sizeof(br_group.u)); 857 858 if (port ? (own_query == &port->ip4_own_query) : 859 (own_query == &br->ip4_own_query)) { 860 other_query = &br->ip4_other_query; 861 br_group.proto = htons(ETH_P_IP); 862 #if IS_ENABLED(CONFIG_IPV6) 863 } else { 864 other_query = &br->ip6_other_query; 865 br_group.proto = htons(ETH_P_IPV6); 866 #endif 867 } 868 869 if (!other_query || timer_pending(&other_query->timer)) 870 return; 871 872 __br_multicast_send_query(br, port, &br_group); 873 874 time = jiffies; 875 time += own_query->startup_sent < br->multicast_startup_query_count ? 876 br->multicast_startup_query_interval : 877 br->multicast_query_interval; 878 mod_timer(&own_query->timer, time); 879 } 880 881 static void 882 br_multicast_port_query_expired(struct net_bridge_port *port, 883 struct bridge_mcast_own_query *query) 884 { 885 struct net_bridge *br = port->br; 886 887 spin_lock(&br->multicast_lock); 888 if (port->state == BR_STATE_DISABLED || 889 port->state == BR_STATE_BLOCKING) 890 goto out; 891 892 if (query->startup_sent < br->multicast_startup_query_count) 893 query->startup_sent++; 894 895 br_multicast_send_query(port->br, port, query); 896 897 out: 898 spin_unlock(&br->multicast_lock); 899 } 900 901 static void br_ip4_multicast_port_query_expired(unsigned long data) 902 { 903 struct net_bridge_port *port = (void *)data; 904 905 br_multicast_port_query_expired(port, &port->ip4_own_query); 906 } 907 908 #if IS_ENABLED(CONFIG_IPV6) 909 static void br_ip6_multicast_port_query_expired(unsigned long data) 910 { 911 struct net_bridge_port *port = (void *)data; 912 913 br_multicast_port_query_expired(port, &port->ip6_own_query); 914 } 915 #endif 916 917 void br_multicast_add_port(struct net_bridge_port *port) 918 { 919 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 920 921 setup_timer(&port->multicast_router_timer, br_multicast_router_expired, 922 (unsigned long)port); 923 setup_timer(&port->ip4_own_query.timer, 924 br_ip4_multicast_port_query_expired, (unsigned long)port); 925 #if IS_ENABLED(CONFIG_IPV6) 926 setup_timer(&port->ip6_own_query.timer, 927 br_ip6_multicast_port_query_expired, (unsigned long)port); 928 #endif 929 } 930 931 void br_multicast_del_port(struct net_bridge_port *port) 932 { 933 struct net_bridge *br = port->br; 934 struct net_bridge_port_group *pg; 935 struct hlist_node *n; 936 937 /* Take care of the remaining groups, only perm ones should be left */ 938 spin_lock_bh(&br->multicast_lock); 939 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 940 br_multicast_del_pg(br, pg); 941 spin_unlock_bh(&br->multicast_lock); 942 del_timer_sync(&port->multicast_router_timer); 943 } 944 945 static void br_multicast_enable(struct bridge_mcast_own_query *query) 946 { 947 query->startup_sent = 0; 948 949 if (try_to_del_timer_sync(&query->timer) >= 0 || 950 del_timer(&query->timer)) 951 mod_timer(&query->timer, jiffies); 952 } 953 954 void br_multicast_enable_port(struct net_bridge_port *port) 955 { 956 struct net_bridge *br = port->br; 957 958 spin_lock(&br->multicast_lock); 959 if (br->multicast_disabled || !netif_running(br->dev)) 960 goto out; 961 962 br_multicast_enable(&port->ip4_own_query); 963 #if IS_ENABLED(CONFIG_IPV6) 964 br_multicast_enable(&port->ip6_own_query); 965 #endif 966 if (port->multicast_router == MDB_RTR_TYPE_PERM && 967 hlist_unhashed(&port->rlist)) 968 br_multicast_add_router(br, port); 969 970 out: 971 spin_unlock(&br->multicast_lock); 972 } 973 974 void br_multicast_disable_port(struct net_bridge_port *port) 975 { 976 struct net_bridge *br = port->br; 977 struct net_bridge_port_group *pg; 978 struct hlist_node *n; 979 980 spin_lock(&br->multicast_lock); 981 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 982 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT)) 983 br_multicast_del_pg(br, pg); 984 985 if (!hlist_unhashed(&port->rlist)) { 986 hlist_del_init_rcu(&port->rlist); 987 br_rtr_notify(br->dev, port, RTM_DELMDB); 988 /* Don't allow timer refresh if disabling */ 989 if (port->multicast_router == MDB_RTR_TYPE_TEMP) 990 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 991 } 992 del_timer(&port->multicast_router_timer); 993 del_timer(&port->ip4_own_query.timer); 994 #if IS_ENABLED(CONFIG_IPV6) 995 del_timer(&port->ip6_own_query.timer); 996 #endif 997 spin_unlock(&br->multicast_lock); 998 } 999 1000 static int br_ip4_multicast_igmp3_report(struct net_bridge *br, 1001 struct net_bridge_port *port, 1002 struct sk_buff *skb, 1003 u16 vid) 1004 { 1005 struct igmpv3_report *ih; 1006 struct igmpv3_grec *grec; 1007 int i; 1008 int len; 1009 int num; 1010 int type; 1011 int err = 0; 1012 __be32 group; 1013 1014 ih = igmpv3_report_hdr(skb); 1015 num = ntohs(ih->ngrec); 1016 len = skb_transport_offset(skb) + sizeof(*ih); 1017 1018 for (i = 0; i < num; i++) { 1019 len += sizeof(*grec); 1020 if (!pskb_may_pull(skb, len)) 1021 return -EINVAL; 1022 1023 grec = (void *)(skb->data + len - sizeof(*grec)); 1024 group = grec->grec_mca; 1025 type = grec->grec_type; 1026 1027 len += ntohs(grec->grec_nsrcs) * 4; 1028 if (!pskb_may_pull(skb, len)) 1029 return -EINVAL; 1030 1031 /* We treat this as an IGMPv2 report for now. */ 1032 switch (type) { 1033 case IGMPV3_MODE_IS_INCLUDE: 1034 case IGMPV3_MODE_IS_EXCLUDE: 1035 case IGMPV3_CHANGE_TO_INCLUDE: 1036 case IGMPV3_CHANGE_TO_EXCLUDE: 1037 case IGMPV3_ALLOW_NEW_SOURCES: 1038 case IGMPV3_BLOCK_OLD_SOURCES: 1039 break; 1040 1041 default: 1042 continue; 1043 } 1044 1045 if ((type == IGMPV3_CHANGE_TO_INCLUDE || 1046 type == IGMPV3_MODE_IS_INCLUDE) && 1047 ntohs(grec->grec_nsrcs) == 0) { 1048 br_ip4_multicast_leave_group(br, port, group, vid); 1049 } else { 1050 err = br_ip4_multicast_add_group(br, port, group, vid); 1051 if (err) 1052 break; 1053 } 1054 } 1055 1056 return err; 1057 } 1058 1059 #if IS_ENABLED(CONFIG_IPV6) 1060 static int br_ip6_multicast_mld2_report(struct net_bridge *br, 1061 struct net_bridge_port *port, 1062 struct sk_buff *skb, 1063 u16 vid) 1064 { 1065 struct icmp6hdr *icmp6h; 1066 struct mld2_grec *grec; 1067 int i; 1068 int len; 1069 int num; 1070 int err = 0; 1071 1072 if (!pskb_may_pull(skb, sizeof(*icmp6h))) 1073 return -EINVAL; 1074 1075 icmp6h = icmp6_hdr(skb); 1076 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 1077 len = skb_transport_offset(skb) + sizeof(*icmp6h); 1078 1079 for (i = 0; i < num; i++) { 1080 __be16 *nsrcs, _nsrcs; 1081 1082 nsrcs = skb_header_pointer(skb, 1083 len + offsetof(struct mld2_grec, 1084 grec_nsrcs), 1085 sizeof(_nsrcs), &_nsrcs); 1086 if (!nsrcs) 1087 return -EINVAL; 1088 1089 if (!pskb_may_pull(skb, 1090 len + sizeof(*grec) + 1091 sizeof(struct in6_addr) * ntohs(*nsrcs))) 1092 return -EINVAL; 1093 1094 grec = (struct mld2_grec *)(skb->data + len); 1095 len += sizeof(*grec) + 1096 sizeof(struct in6_addr) * ntohs(*nsrcs); 1097 1098 /* We treat these as MLDv1 reports for now. */ 1099 switch (grec->grec_type) { 1100 case MLD2_MODE_IS_INCLUDE: 1101 case MLD2_MODE_IS_EXCLUDE: 1102 case MLD2_CHANGE_TO_INCLUDE: 1103 case MLD2_CHANGE_TO_EXCLUDE: 1104 case MLD2_ALLOW_NEW_SOURCES: 1105 case MLD2_BLOCK_OLD_SOURCES: 1106 break; 1107 1108 default: 1109 continue; 1110 } 1111 1112 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE || 1113 grec->grec_type == MLD2_MODE_IS_INCLUDE) && 1114 ntohs(*nsrcs) == 0) { 1115 br_ip6_multicast_leave_group(br, port, &grec->grec_mca, 1116 vid); 1117 } else { 1118 err = br_ip6_multicast_add_group(br, port, 1119 &grec->grec_mca, vid); 1120 if (!err) 1121 break; 1122 } 1123 } 1124 1125 return err; 1126 } 1127 #endif 1128 1129 static bool br_ip4_multicast_select_querier(struct net_bridge *br, 1130 struct net_bridge_port *port, 1131 __be32 saddr) 1132 { 1133 if (!timer_pending(&br->ip4_own_query.timer) && 1134 !timer_pending(&br->ip4_other_query.timer)) 1135 goto update; 1136 1137 if (!br->ip4_querier.addr.u.ip4) 1138 goto update; 1139 1140 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4)) 1141 goto update; 1142 1143 return false; 1144 1145 update: 1146 br->ip4_querier.addr.u.ip4 = saddr; 1147 1148 /* update protected by general multicast_lock by caller */ 1149 rcu_assign_pointer(br->ip4_querier.port, port); 1150 1151 return true; 1152 } 1153 1154 #if IS_ENABLED(CONFIG_IPV6) 1155 static bool br_ip6_multicast_select_querier(struct net_bridge *br, 1156 struct net_bridge_port *port, 1157 struct in6_addr *saddr) 1158 { 1159 if (!timer_pending(&br->ip6_own_query.timer) && 1160 !timer_pending(&br->ip6_other_query.timer)) 1161 goto update; 1162 1163 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0) 1164 goto update; 1165 1166 return false; 1167 1168 update: 1169 br->ip6_querier.addr.u.ip6 = *saddr; 1170 1171 /* update protected by general multicast_lock by caller */ 1172 rcu_assign_pointer(br->ip6_querier.port, port); 1173 1174 return true; 1175 } 1176 #endif 1177 1178 static bool br_multicast_select_querier(struct net_bridge *br, 1179 struct net_bridge_port *port, 1180 struct br_ip *saddr) 1181 { 1182 switch (saddr->proto) { 1183 case htons(ETH_P_IP): 1184 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4); 1185 #if IS_ENABLED(CONFIG_IPV6) 1186 case htons(ETH_P_IPV6): 1187 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6); 1188 #endif 1189 } 1190 1191 return false; 1192 } 1193 1194 static void 1195 br_multicast_update_query_timer(struct net_bridge *br, 1196 struct bridge_mcast_other_query *query, 1197 unsigned long max_delay) 1198 { 1199 if (!timer_pending(&query->timer)) 1200 query->delay_time = jiffies + max_delay; 1201 1202 mod_timer(&query->timer, jiffies + br->multicast_querier_interval); 1203 } 1204 1205 /* 1206 * Add port to router_list 1207 * list is maintained ordered by pointer value 1208 * and locked by br->multicast_lock and RCU 1209 */ 1210 static void br_multicast_add_router(struct net_bridge *br, 1211 struct net_bridge_port *port) 1212 { 1213 struct net_bridge_port *p; 1214 struct hlist_node *slot = NULL; 1215 1216 if (!hlist_unhashed(&port->rlist)) 1217 return; 1218 1219 hlist_for_each_entry(p, &br->router_list, rlist) { 1220 if ((unsigned long) port >= (unsigned long) p) 1221 break; 1222 slot = &p->rlist; 1223 } 1224 1225 if (slot) 1226 hlist_add_behind_rcu(&port->rlist, slot); 1227 else 1228 hlist_add_head_rcu(&port->rlist, &br->router_list); 1229 br_rtr_notify(br->dev, port, RTM_NEWMDB); 1230 } 1231 1232 static void br_multicast_mark_router(struct net_bridge *br, 1233 struct net_bridge_port *port) 1234 { 1235 unsigned long now = jiffies; 1236 1237 if (!port) { 1238 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) 1239 mod_timer(&br->multicast_router_timer, 1240 now + br->multicast_querier_interval); 1241 return; 1242 } 1243 1244 if (port->multicast_router == MDB_RTR_TYPE_DISABLED || 1245 port->multicast_router == MDB_RTR_TYPE_PERM) 1246 return; 1247 1248 br_multicast_add_router(br, port); 1249 1250 mod_timer(&port->multicast_router_timer, 1251 now + br->multicast_querier_interval); 1252 } 1253 1254 static void br_multicast_query_received(struct net_bridge *br, 1255 struct net_bridge_port *port, 1256 struct bridge_mcast_other_query *query, 1257 struct br_ip *saddr, 1258 unsigned long max_delay) 1259 { 1260 if (!br_multicast_select_querier(br, port, saddr)) 1261 return; 1262 1263 br_multicast_update_query_timer(br, query, max_delay); 1264 br_multicast_mark_router(br, port); 1265 } 1266 1267 static int br_ip4_multicast_query(struct net_bridge *br, 1268 struct net_bridge_port *port, 1269 struct sk_buff *skb, 1270 u16 vid) 1271 { 1272 const struct iphdr *iph = ip_hdr(skb); 1273 struct igmphdr *ih = igmp_hdr(skb); 1274 struct net_bridge_mdb_entry *mp; 1275 struct igmpv3_query *ih3; 1276 struct net_bridge_port_group *p; 1277 struct net_bridge_port_group __rcu **pp; 1278 struct br_ip saddr; 1279 unsigned long max_delay; 1280 unsigned long now = jiffies; 1281 __be32 group; 1282 int err = 0; 1283 1284 spin_lock(&br->multicast_lock); 1285 if (!netif_running(br->dev) || 1286 (port && port->state == BR_STATE_DISABLED)) 1287 goto out; 1288 1289 group = ih->group; 1290 1291 if (skb->len == sizeof(*ih)) { 1292 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 1293 1294 if (!max_delay) { 1295 max_delay = 10 * HZ; 1296 group = 0; 1297 } 1298 } else if (skb->len >= sizeof(*ih3)) { 1299 ih3 = igmpv3_query_hdr(skb); 1300 if (ih3->nsrcs) 1301 goto out; 1302 1303 max_delay = ih3->code ? 1304 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 1305 } else { 1306 goto out; 1307 } 1308 1309 if (!group) { 1310 saddr.proto = htons(ETH_P_IP); 1311 saddr.u.ip4 = iph->saddr; 1312 1313 br_multicast_query_received(br, port, &br->ip4_other_query, 1314 &saddr, max_delay); 1315 goto out; 1316 } 1317 1318 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid); 1319 if (!mp) 1320 goto out; 1321 1322 max_delay *= br->multicast_last_member_count; 1323 1324 if (mp->mglist && 1325 (timer_pending(&mp->timer) ? 1326 time_after(mp->timer.expires, now + max_delay) : 1327 try_to_del_timer_sync(&mp->timer) >= 0)) 1328 mod_timer(&mp->timer, now + max_delay); 1329 1330 for (pp = &mp->ports; 1331 (p = mlock_dereference(*pp, br)) != NULL; 1332 pp = &p->next) { 1333 if (timer_pending(&p->timer) ? 1334 time_after(p->timer.expires, now + max_delay) : 1335 try_to_del_timer_sync(&p->timer) >= 0) 1336 mod_timer(&p->timer, now + max_delay); 1337 } 1338 1339 out: 1340 spin_unlock(&br->multicast_lock); 1341 return err; 1342 } 1343 1344 #if IS_ENABLED(CONFIG_IPV6) 1345 static int br_ip6_multicast_query(struct net_bridge *br, 1346 struct net_bridge_port *port, 1347 struct sk_buff *skb, 1348 u16 vid) 1349 { 1350 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 1351 struct mld_msg *mld; 1352 struct net_bridge_mdb_entry *mp; 1353 struct mld2_query *mld2q; 1354 struct net_bridge_port_group *p; 1355 struct net_bridge_port_group __rcu **pp; 1356 struct br_ip saddr; 1357 unsigned long max_delay; 1358 unsigned long now = jiffies; 1359 const struct in6_addr *group = NULL; 1360 bool is_general_query; 1361 int err = 0; 1362 1363 spin_lock(&br->multicast_lock); 1364 if (!netif_running(br->dev) || 1365 (port && port->state == BR_STATE_DISABLED)) 1366 goto out; 1367 1368 if (skb->len == sizeof(*mld)) { 1369 if (!pskb_may_pull(skb, sizeof(*mld))) { 1370 err = -EINVAL; 1371 goto out; 1372 } 1373 mld = (struct mld_msg *) icmp6_hdr(skb); 1374 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); 1375 if (max_delay) 1376 group = &mld->mld_mca; 1377 } else { 1378 if (!pskb_may_pull(skb, sizeof(*mld2q))) { 1379 err = -EINVAL; 1380 goto out; 1381 } 1382 mld2q = (struct mld2_query *)icmp6_hdr(skb); 1383 if (!mld2q->mld2q_nsrcs) 1384 group = &mld2q->mld2q_mca; 1385 1386 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); 1387 } 1388 1389 is_general_query = group && ipv6_addr_any(group); 1390 1391 if (is_general_query) { 1392 saddr.proto = htons(ETH_P_IPV6); 1393 saddr.u.ip6 = ip6h->saddr; 1394 1395 br_multicast_query_received(br, port, &br->ip6_other_query, 1396 &saddr, max_delay); 1397 goto out; 1398 } else if (!group) { 1399 goto out; 1400 } 1401 1402 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid); 1403 if (!mp) 1404 goto out; 1405 1406 max_delay *= br->multicast_last_member_count; 1407 if (mp->mglist && 1408 (timer_pending(&mp->timer) ? 1409 time_after(mp->timer.expires, now + max_delay) : 1410 try_to_del_timer_sync(&mp->timer) >= 0)) 1411 mod_timer(&mp->timer, now + max_delay); 1412 1413 for (pp = &mp->ports; 1414 (p = mlock_dereference(*pp, br)) != NULL; 1415 pp = &p->next) { 1416 if (timer_pending(&p->timer) ? 1417 time_after(p->timer.expires, now + max_delay) : 1418 try_to_del_timer_sync(&p->timer) >= 0) 1419 mod_timer(&p->timer, now + max_delay); 1420 } 1421 1422 out: 1423 spin_unlock(&br->multicast_lock); 1424 return err; 1425 } 1426 #endif 1427 1428 static void 1429 br_multicast_leave_group(struct net_bridge *br, 1430 struct net_bridge_port *port, 1431 struct br_ip *group, 1432 struct bridge_mcast_other_query *other_query, 1433 struct bridge_mcast_own_query *own_query) 1434 { 1435 struct net_bridge_mdb_htable *mdb; 1436 struct net_bridge_mdb_entry *mp; 1437 struct net_bridge_port_group *p; 1438 unsigned long now; 1439 unsigned long time; 1440 1441 spin_lock(&br->multicast_lock); 1442 if (!netif_running(br->dev) || 1443 (port && port->state == BR_STATE_DISABLED)) 1444 goto out; 1445 1446 mdb = mlock_dereference(br->mdb, br); 1447 mp = br_mdb_ip_get(mdb, group); 1448 if (!mp) 1449 goto out; 1450 1451 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { 1452 struct net_bridge_port_group __rcu **pp; 1453 1454 for (pp = &mp->ports; 1455 (p = mlock_dereference(*pp, br)) != NULL; 1456 pp = &p->next) { 1457 if (p->port != port) 1458 continue; 1459 1460 rcu_assign_pointer(*pp, p->next); 1461 hlist_del_init(&p->mglist); 1462 del_timer(&p->timer); 1463 call_rcu_bh(&p->rcu, br_multicast_free_pg); 1464 br_mdb_notify(br->dev, p, RTM_DELMDB); 1465 1466 if (!mp->ports && !mp->mglist && 1467 netif_running(br->dev)) 1468 mod_timer(&mp->timer, jiffies); 1469 } 1470 goto out; 1471 } 1472 1473 if (timer_pending(&other_query->timer)) 1474 goto out; 1475 1476 if (br->multicast_querier) { 1477 __br_multicast_send_query(br, port, &mp->addr); 1478 1479 time = jiffies + br->multicast_last_member_count * 1480 br->multicast_last_member_interval; 1481 1482 mod_timer(&own_query->timer, time); 1483 1484 for (p = mlock_dereference(mp->ports, br); 1485 p != NULL; 1486 p = mlock_dereference(p->next, br)) { 1487 if (p->port != port) 1488 continue; 1489 1490 if (!hlist_unhashed(&p->mglist) && 1491 (timer_pending(&p->timer) ? 1492 time_after(p->timer.expires, time) : 1493 try_to_del_timer_sync(&p->timer) >= 0)) { 1494 mod_timer(&p->timer, time); 1495 } 1496 1497 break; 1498 } 1499 } 1500 1501 now = jiffies; 1502 time = now + br->multicast_last_member_count * 1503 br->multicast_last_member_interval; 1504 1505 if (!port) { 1506 if (mp->mglist && 1507 (timer_pending(&mp->timer) ? 1508 time_after(mp->timer.expires, time) : 1509 try_to_del_timer_sync(&mp->timer) >= 0)) { 1510 mod_timer(&mp->timer, time); 1511 } 1512 1513 goto out; 1514 } 1515 1516 for (p = mlock_dereference(mp->ports, br); 1517 p != NULL; 1518 p = mlock_dereference(p->next, br)) { 1519 if (p->port != port) 1520 continue; 1521 1522 if (!hlist_unhashed(&p->mglist) && 1523 (timer_pending(&p->timer) ? 1524 time_after(p->timer.expires, time) : 1525 try_to_del_timer_sync(&p->timer) >= 0)) { 1526 mod_timer(&p->timer, time); 1527 } 1528 1529 break; 1530 } 1531 out: 1532 spin_unlock(&br->multicast_lock); 1533 } 1534 1535 static void br_ip4_multicast_leave_group(struct net_bridge *br, 1536 struct net_bridge_port *port, 1537 __be32 group, 1538 __u16 vid) 1539 { 1540 struct br_ip br_group; 1541 struct bridge_mcast_own_query *own_query; 1542 1543 if (ipv4_is_local_multicast(group)) 1544 return; 1545 1546 own_query = port ? &port->ip4_own_query : &br->ip4_own_query; 1547 1548 br_group.u.ip4 = group; 1549 br_group.proto = htons(ETH_P_IP); 1550 br_group.vid = vid; 1551 1552 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query, 1553 own_query); 1554 } 1555 1556 #if IS_ENABLED(CONFIG_IPV6) 1557 static void br_ip6_multicast_leave_group(struct net_bridge *br, 1558 struct net_bridge_port *port, 1559 const struct in6_addr *group, 1560 __u16 vid) 1561 { 1562 struct br_ip br_group; 1563 struct bridge_mcast_own_query *own_query; 1564 1565 if (ipv6_addr_is_ll_all_nodes(group)) 1566 return; 1567 1568 own_query = port ? &port->ip6_own_query : &br->ip6_own_query; 1569 1570 br_group.u.ip6 = *group; 1571 br_group.proto = htons(ETH_P_IPV6); 1572 br_group.vid = vid; 1573 1574 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query, 1575 own_query); 1576 } 1577 #endif 1578 1579 static int br_multicast_ipv4_rcv(struct net_bridge *br, 1580 struct net_bridge_port *port, 1581 struct sk_buff *skb, 1582 u16 vid) 1583 { 1584 struct sk_buff *skb_trimmed = NULL; 1585 struct igmphdr *ih; 1586 int err; 1587 1588 err = ip_mc_check_igmp(skb, &skb_trimmed); 1589 1590 if (err == -ENOMSG) { 1591 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) 1592 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1593 return 0; 1594 } else if (err < 0) { 1595 return err; 1596 } 1597 1598 BR_INPUT_SKB_CB(skb)->igmp = 1; 1599 ih = igmp_hdr(skb); 1600 1601 switch (ih->type) { 1602 case IGMP_HOST_MEMBERSHIP_REPORT: 1603 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1604 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1605 err = br_ip4_multicast_add_group(br, port, ih->group, vid); 1606 break; 1607 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1608 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid); 1609 break; 1610 case IGMP_HOST_MEMBERSHIP_QUERY: 1611 err = br_ip4_multicast_query(br, port, skb_trimmed, vid); 1612 break; 1613 case IGMP_HOST_LEAVE_MESSAGE: 1614 br_ip4_multicast_leave_group(br, port, ih->group, vid); 1615 break; 1616 } 1617 1618 if (skb_trimmed && skb_trimmed != skb) 1619 kfree_skb(skb_trimmed); 1620 1621 return err; 1622 } 1623 1624 #if IS_ENABLED(CONFIG_IPV6) 1625 static int br_multicast_ipv6_rcv(struct net_bridge *br, 1626 struct net_bridge_port *port, 1627 struct sk_buff *skb, 1628 u16 vid) 1629 { 1630 struct sk_buff *skb_trimmed = NULL; 1631 struct mld_msg *mld; 1632 int err; 1633 1634 err = ipv6_mc_check_mld(skb, &skb_trimmed); 1635 1636 if (err == -ENOMSG) { 1637 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr)) 1638 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1639 return 0; 1640 } else if (err < 0) { 1641 return err; 1642 } 1643 1644 BR_INPUT_SKB_CB(skb)->igmp = 1; 1645 mld = (struct mld_msg *)skb_transport_header(skb); 1646 1647 switch (mld->mld_type) { 1648 case ICMPV6_MGM_REPORT: 1649 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1650 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid); 1651 break; 1652 case ICMPV6_MLD2_REPORT: 1653 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid); 1654 break; 1655 case ICMPV6_MGM_QUERY: 1656 err = br_ip6_multicast_query(br, port, skb_trimmed, vid); 1657 break; 1658 case ICMPV6_MGM_REDUCTION: 1659 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid); 1660 break; 1661 } 1662 1663 if (skb_trimmed && skb_trimmed != skb) 1664 kfree_skb(skb_trimmed); 1665 1666 return err; 1667 } 1668 #endif 1669 1670 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 1671 struct sk_buff *skb, u16 vid) 1672 { 1673 BR_INPUT_SKB_CB(skb)->igmp = 0; 1674 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 1675 1676 if (br->multicast_disabled) 1677 return 0; 1678 1679 switch (skb->protocol) { 1680 case htons(ETH_P_IP): 1681 return br_multicast_ipv4_rcv(br, port, skb, vid); 1682 #if IS_ENABLED(CONFIG_IPV6) 1683 case htons(ETH_P_IPV6): 1684 return br_multicast_ipv6_rcv(br, port, skb, vid); 1685 #endif 1686 } 1687 1688 return 0; 1689 } 1690 1691 static void br_multicast_query_expired(struct net_bridge *br, 1692 struct bridge_mcast_own_query *query, 1693 struct bridge_mcast_querier *querier) 1694 { 1695 spin_lock(&br->multicast_lock); 1696 if (query->startup_sent < br->multicast_startup_query_count) 1697 query->startup_sent++; 1698 1699 RCU_INIT_POINTER(querier->port, NULL); 1700 br_multicast_send_query(br, NULL, query); 1701 spin_unlock(&br->multicast_lock); 1702 } 1703 1704 static void br_ip4_multicast_query_expired(unsigned long data) 1705 { 1706 struct net_bridge *br = (void *)data; 1707 1708 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier); 1709 } 1710 1711 #if IS_ENABLED(CONFIG_IPV6) 1712 static void br_ip6_multicast_query_expired(unsigned long data) 1713 { 1714 struct net_bridge *br = (void *)data; 1715 1716 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier); 1717 } 1718 #endif 1719 1720 void br_multicast_init(struct net_bridge *br) 1721 { 1722 br->hash_elasticity = 4; 1723 br->hash_max = 512; 1724 1725 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1726 br->multicast_querier = 0; 1727 br->multicast_query_use_ifaddr = 0; 1728 br->multicast_last_member_count = 2; 1729 br->multicast_startup_query_count = 2; 1730 1731 br->multicast_last_member_interval = HZ; 1732 br->multicast_query_response_interval = 10 * HZ; 1733 br->multicast_startup_query_interval = 125 * HZ / 4; 1734 br->multicast_query_interval = 125 * HZ; 1735 br->multicast_querier_interval = 255 * HZ; 1736 br->multicast_membership_interval = 260 * HZ; 1737 1738 br->ip4_other_query.delay_time = 0; 1739 br->ip4_querier.port = NULL; 1740 #if IS_ENABLED(CONFIG_IPV6) 1741 br->ip6_other_query.delay_time = 0; 1742 br->ip6_querier.port = NULL; 1743 #endif 1744 1745 spin_lock_init(&br->multicast_lock); 1746 setup_timer(&br->multicast_router_timer, 1747 br_multicast_local_router_expired, 0); 1748 setup_timer(&br->ip4_other_query.timer, 1749 br_ip4_multicast_querier_expired, (unsigned long)br); 1750 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired, 1751 (unsigned long)br); 1752 #if IS_ENABLED(CONFIG_IPV6) 1753 setup_timer(&br->ip6_other_query.timer, 1754 br_ip6_multicast_querier_expired, (unsigned long)br); 1755 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired, 1756 (unsigned long)br); 1757 #endif 1758 } 1759 1760 static void __br_multicast_open(struct net_bridge *br, 1761 struct bridge_mcast_own_query *query) 1762 { 1763 query->startup_sent = 0; 1764 1765 if (br->multicast_disabled) 1766 return; 1767 1768 mod_timer(&query->timer, jiffies); 1769 } 1770 1771 void br_multicast_open(struct net_bridge *br) 1772 { 1773 __br_multicast_open(br, &br->ip4_own_query); 1774 #if IS_ENABLED(CONFIG_IPV6) 1775 __br_multicast_open(br, &br->ip6_own_query); 1776 #endif 1777 } 1778 1779 void br_multicast_stop(struct net_bridge *br) 1780 { 1781 del_timer_sync(&br->multicast_router_timer); 1782 del_timer_sync(&br->ip4_other_query.timer); 1783 del_timer_sync(&br->ip4_own_query.timer); 1784 #if IS_ENABLED(CONFIG_IPV6) 1785 del_timer_sync(&br->ip6_other_query.timer); 1786 del_timer_sync(&br->ip6_own_query.timer); 1787 #endif 1788 } 1789 1790 void br_multicast_dev_del(struct net_bridge *br) 1791 { 1792 struct net_bridge_mdb_htable *mdb; 1793 struct net_bridge_mdb_entry *mp; 1794 struct hlist_node *n; 1795 u32 ver; 1796 int i; 1797 1798 spin_lock_bh(&br->multicast_lock); 1799 mdb = mlock_dereference(br->mdb, br); 1800 if (!mdb) 1801 goto out; 1802 1803 br->mdb = NULL; 1804 1805 ver = mdb->ver; 1806 for (i = 0; i < mdb->max; i++) { 1807 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i], 1808 hlist[ver]) { 1809 del_timer(&mp->timer); 1810 call_rcu_bh(&mp->rcu, br_multicast_free_group); 1811 } 1812 } 1813 1814 if (mdb->old) { 1815 spin_unlock_bh(&br->multicast_lock); 1816 rcu_barrier_bh(); 1817 spin_lock_bh(&br->multicast_lock); 1818 WARN_ON(mdb->old); 1819 } 1820 1821 mdb->old = mdb; 1822 call_rcu_bh(&mdb->rcu, br_mdb_free); 1823 1824 out: 1825 spin_unlock_bh(&br->multicast_lock); 1826 } 1827 1828 int br_multicast_set_router(struct net_bridge *br, unsigned long val) 1829 { 1830 int err = -EINVAL; 1831 1832 spin_lock_bh(&br->multicast_lock); 1833 1834 switch (val) { 1835 case MDB_RTR_TYPE_DISABLED: 1836 case MDB_RTR_TYPE_PERM: 1837 del_timer(&br->multicast_router_timer); 1838 /* fall through */ 1839 case MDB_RTR_TYPE_TEMP_QUERY: 1840 br->multicast_router = val; 1841 err = 0; 1842 break; 1843 } 1844 1845 spin_unlock_bh(&br->multicast_lock); 1846 1847 return err; 1848 } 1849 1850 static void __del_port_router(struct net_bridge_port *p) 1851 { 1852 if (hlist_unhashed(&p->rlist)) 1853 return; 1854 hlist_del_init_rcu(&p->rlist); 1855 br_rtr_notify(p->br->dev, p, RTM_DELMDB); 1856 } 1857 1858 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) 1859 { 1860 struct net_bridge *br = p->br; 1861 unsigned long now = jiffies; 1862 int err = -EINVAL; 1863 1864 spin_lock(&br->multicast_lock); 1865 if (p->multicast_router == val) { 1866 /* Refresh the temp router port timer */ 1867 if (p->multicast_router == MDB_RTR_TYPE_TEMP) 1868 mod_timer(&p->multicast_router_timer, 1869 now + br->multicast_querier_interval); 1870 err = 0; 1871 goto unlock; 1872 } 1873 switch (val) { 1874 case MDB_RTR_TYPE_DISABLED: 1875 p->multicast_router = MDB_RTR_TYPE_DISABLED; 1876 __del_port_router(p); 1877 del_timer(&p->multicast_router_timer); 1878 break; 1879 case MDB_RTR_TYPE_TEMP_QUERY: 1880 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1881 __del_port_router(p); 1882 break; 1883 case MDB_RTR_TYPE_PERM: 1884 p->multicast_router = MDB_RTR_TYPE_PERM; 1885 del_timer(&p->multicast_router_timer); 1886 br_multicast_add_router(br, p); 1887 break; 1888 case MDB_RTR_TYPE_TEMP: 1889 p->multicast_router = MDB_RTR_TYPE_TEMP; 1890 br_multicast_mark_router(br, p); 1891 break; 1892 default: 1893 goto unlock; 1894 } 1895 err = 0; 1896 unlock: 1897 spin_unlock(&br->multicast_lock); 1898 1899 return err; 1900 } 1901 1902 static void br_multicast_start_querier(struct net_bridge *br, 1903 struct bridge_mcast_own_query *query) 1904 { 1905 struct net_bridge_port *port; 1906 1907 __br_multicast_open(br, query); 1908 1909 list_for_each_entry(port, &br->port_list, list) { 1910 if (port->state == BR_STATE_DISABLED || 1911 port->state == BR_STATE_BLOCKING) 1912 continue; 1913 1914 if (query == &br->ip4_own_query) 1915 br_multicast_enable(&port->ip4_own_query); 1916 #if IS_ENABLED(CONFIG_IPV6) 1917 else 1918 br_multicast_enable(&port->ip6_own_query); 1919 #endif 1920 } 1921 } 1922 1923 int br_multicast_toggle(struct net_bridge *br, unsigned long val) 1924 { 1925 int err = 0; 1926 struct net_bridge_mdb_htable *mdb; 1927 1928 spin_lock_bh(&br->multicast_lock); 1929 if (br->multicast_disabled == !val) 1930 goto unlock; 1931 1932 br->multicast_disabled = !val; 1933 if (br->multicast_disabled) 1934 goto unlock; 1935 1936 if (!netif_running(br->dev)) 1937 goto unlock; 1938 1939 mdb = mlock_dereference(br->mdb, br); 1940 if (mdb) { 1941 if (mdb->old) { 1942 err = -EEXIST; 1943 rollback: 1944 br->multicast_disabled = !!val; 1945 goto unlock; 1946 } 1947 1948 err = br_mdb_rehash(&br->mdb, mdb->max, 1949 br->hash_elasticity); 1950 if (err) 1951 goto rollback; 1952 } 1953 1954 br_multicast_start_querier(br, &br->ip4_own_query); 1955 #if IS_ENABLED(CONFIG_IPV6) 1956 br_multicast_start_querier(br, &br->ip6_own_query); 1957 #endif 1958 1959 unlock: 1960 spin_unlock_bh(&br->multicast_lock); 1961 1962 return err; 1963 } 1964 1965 int br_multicast_set_querier(struct net_bridge *br, unsigned long val) 1966 { 1967 unsigned long max_delay; 1968 1969 val = !!val; 1970 1971 spin_lock_bh(&br->multicast_lock); 1972 if (br->multicast_querier == val) 1973 goto unlock; 1974 1975 br->multicast_querier = val; 1976 if (!val) 1977 goto unlock; 1978 1979 max_delay = br->multicast_query_response_interval; 1980 1981 if (!timer_pending(&br->ip4_other_query.timer)) 1982 br->ip4_other_query.delay_time = jiffies + max_delay; 1983 1984 br_multicast_start_querier(br, &br->ip4_own_query); 1985 1986 #if IS_ENABLED(CONFIG_IPV6) 1987 if (!timer_pending(&br->ip6_other_query.timer)) 1988 br->ip6_other_query.delay_time = jiffies + max_delay; 1989 1990 br_multicast_start_querier(br, &br->ip6_own_query); 1991 #endif 1992 1993 unlock: 1994 spin_unlock_bh(&br->multicast_lock); 1995 1996 return 0; 1997 } 1998 1999 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) 2000 { 2001 int err = -EINVAL; 2002 u32 old; 2003 struct net_bridge_mdb_htable *mdb; 2004 2005 spin_lock_bh(&br->multicast_lock); 2006 if (!is_power_of_2(val)) 2007 goto unlock; 2008 2009 mdb = mlock_dereference(br->mdb, br); 2010 if (mdb && val < mdb->size) 2011 goto unlock; 2012 2013 err = 0; 2014 2015 old = br->hash_max; 2016 br->hash_max = val; 2017 2018 if (mdb) { 2019 if (mdb->old) { 2020 err = -EEXIST; 2021 rollback: 2022 br->hash_max = old; 2023 goto unlock; 2024 } 2025 2026 err = br_mdb_rehash(&br->mdb, br->hash_max, 2027 br->hash_elasticity); 2028 if (err) 2029 goto rollback; 2030 } 2031 2032 unlock: 2033 spin_unlock_bh(&br->multicast_lock); 2034 2035 return err; 2036 } 2037 2038 /** 2039 * br_multicast_list_adjacent - Returns snooped multicast addresses 2040 * @dev: The bridge port adjacent to which to retrieve addresses 2041 * @br_ip_list: The list to store found, snooped multicast IP addresses in 2042 * 2043 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast 2044 * snooping feature on all bridge ports of dev's bridge device, excluding 2045 * the addresses from dev itself. 2046 * 2047 * Returns the number of items added to br_ip_list. 2048 * 2049 * Notes: 2050 * - br_ip_list needs to be initialized by caller 2051 * - br_ip_list might contain duplicates in the end 2052 * (needs to be taken care of by caller) 2053 * - br_ip_list needs to be freed by caller 2054 */ 2055 int br_multicast_list_adjacent(struct net_device *dev, 2056 struct list_head *br_ip_list) 2057 { 2058 struct net_bridge *br; 2059 struct net_bridge_port *port; 2060 struct net_bridge_port_group *group; 2061 struct br_ip_list *entry; 2062 int count = 0; 2063 2064 rcu_read_lock(); 2065 if (!br_ip_list || !br_port_exists(dev)) 2066 goto unlock; 2067 2068 port = br_port_get_rcu(dev); 2069 if (!port || !port->br) 2070 goto unlock; 2071 2072 br = port->br; 2073 2074 list_for_each_entry_rcu(port, &br->port_list, list) { 2075 if (!port->dev || port->dev == dev) 2076 continue; 2077 2078 hlist_for_each_entry_rcu(group, &port->mglist, mglist) { 2079 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 2080 if (!entry) 2081 goto unlock; 2082 2083 entry->addr = group->addr; 2084 list_add(&entry->list, br_ip_list); 2085 count++; 2086 } 2087 } 2088 2089 unlock: 2090 rcu_read_unlock(); 2091 return count; 2092 } 2093 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); 2094 2095 /** 2096 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge 2097 * @dev: The bridge port providing the bridge on which to check for a querier 2098 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 2099 * 2100 * Checks whether the given interface has a bridge on top and if so returns 2101 * true if a valid querier exists anywhere on the bridged link layer. 2102 * Otherwise returns false. 2103 */ 2104 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto) 2105 { 2106 struct net_bridge *br; 2107 struct net_bridge_port *port; 2108 struct ethhdr eth; 2109 bool ret = false; 2110 2111 rcu_read_lock(); 2112 if (!br_port_exists(dev)) 2113 goto unlock; 2114 2115 port = br_port_get_rcu(dev); 2116 if (!port || !port->br) 2117 goto unlock; 2118 2119 br = port->br; 2120 2121 memset(ð, 0, sizeof(eth)); 2122 eth.h_proto = htons(proto); 2123 2124 ret = br_multicast_querier_exists(br, ð); 2125 2126 unlock: 2127 rcu_read_unlock(); 2128 return ret; 2129 } 2130 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere); 2131 2132 /** 2133 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port 2134 * @dev: The bridge port adjacent to which to check for a querier 2135 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 2136 * 2137 * Checks whether the given interface has a bridge on top and if so returns 2138 * true if a selected querier is behind one of the other ports of this 2139 * bridge. Otherwise returns false. 2140 */ 2141 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) 2142 { 2143 struct net_bridge *br; 2144 struct net_bridge_port *port; 2145 bool ret = false; 2146 2147 rcu_read_lock(); 2148 if (!br_port_exists(dev)) 2149 goto unlock; 2150 2151 port = br_port_get_rcu(dev); 2152 if (!port || !port->br) 2153 goto unlock; 2154 2155 br = port->br; 2156 2157 switch (proto) { 2158 case ETH_P_IP: 2159 if (!timer_pending(&br->ip4_other_query.timer) || 2160 rcu_dereference(br->ip4_querier.port) == port) 2161 goto unlock; 2162 break; 2163 #if IS_ENABLED(CONFIG_IPV6) 2164 case ETH_P_IPV6: 2165 if (!timer_pending(&br->ip6_other_query.timer) || 2166 rcu_dereference(br->ip6_querier.port) == port) 2167 goto unlock; 2168 break; 2169 #endif 2170 default: 2171 goto unlock; 2172 } 2173 2174 ret = true; 2175 unlock: 2176 rcu_read_unlock(); 2177 return ret; 2178 } 2179 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); 2180