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->port, &pg->addr, RTM_DELMDB, 287 p->flags); 288 call_rcu_bh(&p->rcu, br_multicast_free_pg); 289 290 if (!mp->ports && !mp->mglist && 291 netif_running(br->dev)) 292 mod_timer(&mp->timer, jiffies); 293 294 return; 295 } 296 297 WARN_ON(1); 298 } 299 300 static void br_multicast_port_group_expired(unsigned long data) 301 { 302 struct net_bridge_port_group *pg = (void *)data; 303 struct net_bridge *br = pg->port->br; 304 305 spin_lock(&br->multicast_lock); 306 if (!netif_running(br->dev) || timer_pending(&pg->timer) || 307 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT) 308 goto out; 309 310 br_multicast_del_pg(br, pg); 311 312 out: 313 spin_unlock(&br->multicast_lock); 314 } 315 316 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, 317 int elasticity) 318 { 319 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); 320 struct net_bridge_mdb_htable *mdb; 321 int err; 322 323 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); 324 if (!mdb) 325 return -ENOMEM; 326 327 mdb->max = max; 328 mdb->old = old; 329 330 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); 331 if (!mdb->mhash) { 332 kfree(mdb); 333 return -ENOMEM; 334 } 335 336 mdb->size = old ? old->size : 0; 337 mdb->ver = old ? old->ver ^ 1 : 0; 338 339 if (!old || elasticity) 340 get_random_bytes(&mdb->secret, sizeof(mdb->secret)); 341 else 342 mdb->secret = old->secret; 343 344 if (!old) 345 goto out; 346 347 err = br_mdb_copy(mdb, old, elasticity); 348 if (err) { 349 kfree(mdb->mhash); 350 kfree(mdb); 351 return err; 352 } 353 354 br_mdb_rehash_seq++; 355 call_rcu_bh(&mdb->rcu, br_mdb_free); 356 357 out: 358 rcu_assign_pointer(*mdbp, mdb); 359 360 return 0; 361 } 362 363 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, 364 __be32 group) 365 { 366 struct sk_buff *skb; 367 struct igmphdr *ih; 368 struct ethhdr *eth; 369 struct iphdr *iph; 370 371 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + 372 sizeof(*ih) + 4); 373 if (!skb) 374 goto out; 375 376 skb->protocol = htons(ETH_P_IP); 377 378 skb_reset_mac_header(skb); 379 eth = eth_hdr(skb); 380 381 ether_addr_copy(eth->h_source, br->dev->dev_addr); 382 eth->h_dest[0] = 1; 383 eth->h_dest[1] = 0; 384 eth->h_dest[2] = 0x5e; 385 eth->h_dest[3] = 0; 386 eth->h_dest[4] = 0; 387 eth->h_dest[5] = 1; 388 eth->h_proto = htons(ETH_P_IP); 389 skb_put(skb, sizeof(*eth)); 390 391 skb_set_network_header(skb, skb->len); 392 iph = ip_hdr(skb); 393 394 iph->version = 4; 395 iph->ihl = 6; 396 iph->tos = 0xc0; 397 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); 398 iph->id = 0; 399 iph->frag_off = htons(IP_DF); 400 iph->ttl = 1; 401 iph->protocol = IPPROTO_IGMP; 402 iph->saddr = br->multicast_query_use_ifaddr ? 403 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0; 404 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); 405 ((u8 *)&iph[1])[0] = IPOPT_RA; 406 ((u8 *)&iph[1])[1] = 4; 407 ((u8 *)&iph[1])[2] = 0; 408 ((u8 *)&iph[1])[3] = 0; 409 ip_send_check(iph); 410 skb_put(skb, 24); 411 412 skb_set_transport_header(skb, skb->len); 413 ih = igmp_hdr(skb); 414 ih->type = IGMP_HOST_MEMBERSHIP_QUERY; 415 ih->code = (group ? br->multicast_last_member_interval : 416 br->multicast_query_response_interval) / 417 (HZ / IGMP_TIMER_SCALE); 418 ih->group = group; 419 ih->csum = 0; 420 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 421 skb_put(skb, sizeof(*ih)); 422 423 __skb_pull(skb, sizeof(*eth)); 424 425 out: 426 return skb; 427 } 428 429 #if IS_ENABLED(CONFIG_IPV6) 430 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, 431 const struct in6_addr *group) 432 { 433 struct sk_buff *skb; 434 struct ipv6hdr *ip6h; 435 struct mld_msg *mldq; 436 struct ethhdr *eth; 437 u8 *hopopt; 438 unsigned long interval; 439 440 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + 441 8 + sizeof(*mldq)); 442 if (!skb) 443 goto out; 444 445 skb->protocol = htons(ETH_P_IPV6); 446 447 /* Ethernet header */ 448 skb_reset_mac_header(skb); 449 eth = eth_hdr(skb); 450 451 ether_addr_copy(eth->h_source, br->dev->dev_addr); 452 eth->h_proto = htons(ETH_P_IPV6); 453 skb_put(skb, sizeof(*eth)); 454 455 /* IPv6 header + HbH option */ 456 skb_set_network_header(skb, skb->len); 457 ip6h = ipv6_hdr(skb); 458 459 *(__force __be32 *)ip6h = htonl(0x60000000); 460 ip6h->payload_len = htons(8 + sizeof(*mldq)); 461 ip6h->nexthdr = IPPROTO_HOPOPTS; 462 ip6h->hop_limit = 1; 463 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); 464 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, 465 &ip6h->saddr)) { 466 kfree_skb(skb); 467 return NULL; 468 } 469 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 470 471 hopopt = (u8 *)(ip6h + 1); 472 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ 473 hopopt[1] = 0; /* length of HbH */ 474 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ 475 hopopt[3] = 2; /* Length of RA Option */ 476 hopopt[4] = 0; /* Type = 0x0000 (MLD) */ 477 hopopt[5] = 0; 478 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ 479 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ 480 481 skb_put(skb, sizeof(*ip6h) + 8); 482 483 /* ICMPv6 */ 484 skb_set_transport_header(skb, skb->len); 485 mldq = (struct mld_msg *) icmp6_hdr(skb); 486 487 interval = ipv6_addr_any(group) ? 488 br->multicast_query_response_interval : 489 br->multicast_last_member_interval; 490 491 mldq->mld_type = ICMPV6_MGM_QUERY; 492 mldq->mld_code = 0; 493 mldq->mld_cksum = 0; 494 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); 495 mldq->mld_reserved = 0; 496 mldq->mld_mca = *group; 497 498 /* checksum */ 499 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 500 sizeof(*mldq), IPPROTO_ICMPV6, 501 csum_partial(mldq, 502 sizeof(*mldq), 0)); 503 skb_put(skb, sizeof(*mldq)); 504 505 __skb_pull(skb, sizeof(*eth)); 506 507 out: 508 return skb; 509 } 510 #endif 511 512 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, 513 struct br_ip *addr) 514 { 515 switch (addr->proto) { 516 case htons(ETH_P_IP): 517 return br_ip4_multicast_alloc_query(br, addr->u.ip4); 518 #if IS_ENABLED(CONFIG_IPV6) 519 case htons(ETH_P_IPV6): 520 return br_ip6_multicast_alloc_query(br, &addr->u.ip6); 521 #endif 522 } 523 return NULL; 524 } 525 526 static struct net_bridge_mdb_entry *br_multicast_get_group( 527 struct net_bridge *br, struct net_bridge_port *port, 528 struct br_ip *group, int hash) 529 { 530 struct net_bridge_mdb_htable *mdb; 531 struct net_bridge_mdb_entry *mp; 532 unsigned int count = 0; 533 unsigned int max; 534 int elasticity; 535 int err; 536 537 mdb = rcu_dereference_protected(br->mdb, 1); 538 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) { 539 count++; 540 if (unlikely(br_ip_equal(group, &mp->addr))) 541 return mp; 542 } 543 544 elasticity = 0; 545 max = mdb->max; 546 547 if (unlikely(count > br->hash_elasticity && count)) { 548 if (net_ratelimit()) 549 br_info(br, "Multicast hash table " 550 "chain limit reached: %s\n", 551 port ? port->dev->name : br->dev->name); 552 553 elasticity = br->hash_elasticity; 554 } 555 556 if (mdb->size >= max) { 557 max *= 2; 558 if (unlikely(max > br->hash_max)) { 559 br_warn(br, "Multicast hash table maximum of %d " 560 "reached, disabling snooping: %s\n", 561 br->hash_max, 562 port ? port->dev->name : br->dev->name); 563 err = -E2BIG; 564 disable: 565 br->multicast_disabled = 1; 566 goto err; 567 } 568 } 569 570 if (max > mdb->max || elasticity) { 571 if (mdb->old) { 572 if (net_ratelimit()) 573 br_info(br, "Multicast hash table " 574 "on fire: %s\n", 575 port ? port->dev->name : br->dev->name); 576 err = -EEXIST; 577 goto err; 578 } 579 580 err = br_mdb_rehash(&br->mdb, max, elasticity); 581 if (err) { 582 br_warn(br, "Cannot rehash multicast " 583 "hash table, disabling snooping: %s, %d, %d\n", 584 port ? port->dev->name : br->dev->name, 585 mdb->size, err); 586 goto disable; 587 } 588 589 err = -EAGAIN; 590 goto err; 591 } 592 593 return NULL; 594 595 err: 596 mp = ERR_PTR(err); 597 return mp; 598 } 599 600 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, 601 struct net_bridge_port *port, struct br_ip *group) 602 { 603 struct net_bridge_mdb_htable *mdb; 604 struct net_bridge_mdb_entry *mp; 605 int hash; 606 int err; 607 608 mdb = rcu_dereference_protected(br->mdb, 1); 609 if (!mdb) { 610 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); 611 if (err) 612 return ERR_PTR(err); 613 goto rehash; 614 } 615 616 hash = br_ip_hash(mdb, group); 617 mp = br_multicast_get_group(br, port, group, hash); 618 switch (PTR_ERR(mp)) { 619 case 0: 620 break; 621 622 case -EAGAIN: 623 rehash: 624 mdb = rcu_dereference_protected(br->mdb, 1); 625 hash = br_ip_hash(mdb, group); 626 break; 627 628 default: 629 goto out; 630 } 631 632 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 633 if (unlikely(!mp)) 634 return ERR_PTR(-ENOMEM); 635 636 mp->br = br; 637 mp->addr = *group; 638 setup_timer(&mp->timer, br_multicast_group_expired, 639 (unsigned long)mp); 640 641 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); 642 mdb->size++; 643 644 out: 645 return mp; 646 } 647 648 struct net_bridge_port_group *br_multicast_new_port_group( 649 struct net_bridge_port *port, 650 struct br_ip *group, 651 struct net_bridge_port_group __rcu *next, 652 unsigned char flags) 653 { 654 struct net_bridge_port_group *p; 655 656 p = kzalloc(sizeof(*p), GFP_ATOMIC); 657 if (unlikely(!p)) 658 return NULL; 659 660 p->addr = *group; 661 p->port = port; 662 p->flags = flags; 663 rcu_assign_pointer(p->next, next); 664 hlist_add_head(&p->mglist, &port->mglist); 665 setup_timer(&p->timer, br_multicast_port_group_expired, 666 (unsigned long)p); 667 return p; 668 } 669 670 static int br_multicast_add_group(struct net_bridge *br, 671 struct net_bridge_port *port, 672 struct br_ip *group) 673 { 674 struct net_bridge_mdb_entry *mp; 675 struct net_bridge_port_group *p; 676 struct net_bridge_port_group __rcu **pp; 677 unsigned long now = jiffies; 678 int err; 679 680 spin_lock(&br->multicast_lock); 681 if (!netif_running(br->dev) || 682 (port && port->state == BR_STATE_DISABLED)) 683 goto out; 684 685 mp = br_multicast_new_group(br, port, group); 686 err = PTR_ERR(mp); 687 if (IS_ERR(mp)) 688 goto err; 689 690 if (!port) { 691 mp->mglist = true; 692 mod_timer(&mp->timer, now + br->multicast_membership_interval); 693 goto out; 694 } 695 696 for (pp = &mp->ports; 697 (p = mlock_dereference(*pp, br)) != NULL; 698 pp = &p->next) { 699 if (p->port == port) 700 goto found; 701 if ((unsigned long)p->port < (unsigned long)port) 702 break; 703 } 704 705 p = br_multicast_new_port_group(port, group, *pp, 0); 706 if (unlikely(!p)) 707 goto err; 708 rcu_assign_pointer(*pp, p); 709 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0); 710 711 found: 712 mod_timer(&p->timer, now + br->multicast_membership_interval); 713 out: 714 err = 0; 715 716 err: 717 spin_unlock(&br->multicast_lock); 718 return err; 719 } 720 721 static int br_ip4_multicast_add_group(struct net_bridge *br, 722 struct net_bridge_port *port, 723 __be32 group, 724 __u16 vid) 725 { 726 struct br_ip br_group; 727 728 if (ipv4_is_local_multicast(group)) 729 return 0; 730 731 br_group.u.ip4 = group; 732 br_group.proto = htons(ETH_P_IP); 733 br_group.vid = vid; 734 735 return br_multicast_add_group(br, port, &br_group); 736 } 737 738 #if IS_ENABLED(CONFIG_IPV6) 739 static int br_ip6_multicast_add_group(struct net_bridge *br, 740 struct net_bridge_port *port, 741 const struct in6_addr *group, 742 __u16 vid) 743 { 744 struct br_ip br_group; 745 746 if (ipv6_addr_is_ll_all_nodes(group)) 747 return 0; 748 749 br_group.u.ip6 = *group; 750 br_group.proto = htons(ETH_P_IPV6); 751 br_group.vid = vid; 752 753 return br_multicast_add_group(br, port, &br_group); 754 } 755 #endif 756 757 static void br_multicast_router_expired(unsigned long data) 758 { 759 struct net_bridge_port *port = (void *)data; 760 struct net_bridge *br = port->br; 761 762 spin_lock(&br->multicast_lock); 763 if (port->multicast_router == MDB_RTR_TYPE_DISABLED || 764 port->multicast_router == MDB_RTR_TYPE_PERM || 765 timer_pending(&port->multicast_router_timer) || 766 hlist_unhashed(&port->rlist)) 767 goto out; 768 769 hlist_del_init_rcu(&port->rlist); 770 br_rtr_notify(br->dev, port, RTM_DELMDB); 771 /* Don't allow timer refresh if the router expired */ 772 if (port->multicast_router == MDB_RTR_TYPE_TEMP) 773 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 774 775 out: 776 spin_unlock(&br->multicast_lock); 777 } 778 779 static void br_multicast_local_router_expired(unsigned long data) 780 { 781 } 782 783 static void br_multicast_querier_expired(struct net_bridge *br, 784 struct bridge_mcast_own_query *query) 785 { 786 spin_lock(&br->multicast_lock); 787 if (!netif_running(br->dev) || br->multicast_disabled) 788 goto out; 789 790 br_multicast_start_querier(br, query); 791 792 out: 793 spin_unlock(&br->multicast_lock); 794 } 795 796 static void br_ip4_multicast_querier_expired(unsigned long data) 797 { 798 struct net_bridge *br = (void *)data; 799 800 br_multicast_querier_expired(br, &br->ip4_own_query); 801 } 802 803 #if IS_ENABLED(CONFIG_IPV6) 804 static void br_ip6_multicast_querier_expired(unsigned long data) 805 { 806 struct net_bridge *br = (void *)data; 807 808 br_multicast_querier_expired(br, &br->ip6_own_query); 809 } 810 #endif 811 812 static void br_multicast_select_own_querier(struct net_bridge *br, 813 struct br_ip *ip, 814 struct sk_buff *skb) 815 { 816 if (ip->proto == htons(ETH_P_IP)) 817 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr; 818 #if IS_ENABLED(CONFIG_IPV6) 819 else 820 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr; 821 #endif 822 } 823 824 static void __br_multicast_send_query(struct net_bridge *br, 825 struct net_bridge_port *port, 826 struct br_ip *ip) 827 { 828 struct sk_buff *skb; 829 830 skb = br_multicast_alloc_query(br, ip); 831 if (!skb) 832 return; 833 834 if (port) { 835 skb->dev = port->dev; 836 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, 837 dev_net(port->dev), NULL, skb, NULL, skb->dev, 838 br_dev_queue_push_xmit); 839 } else { 840 br_multicast_select_own_querier(br, ip, skb); 841 netif_rx(skb); 842 } 843 } 844 845 static void br_multicast_send_query(struct net_bridge *br, 846 struct net_bridge_port *port, 847 struct bridge_mcast_own_query *own_query) 848 { 849 unsigned long time; 850 struct br_ip br_group; 851 struct bridge_mcast_other_query *other_query = NULL; 852 853 if (!netif_running(br->dev) || br->multicast_disabled || 854 !br->multicast_querier) 855 return; 856 857 memset(&br_group.u, 0, sizeof(br_group.u)); 858 859 if (port ? (own_query == &port->ip4_own_query) : 860 (own_query == &br->ip4_own_query)) { 861 other_query = &br->ip4_other_query; 862 br_group.proto = htons(ETH_P_IP); 863 #if IS_ENABLED(CONFIG_IPV6) 864 } else { 865 other_query = &br->ip6_other_query; 866 br_group.proto = htons(ETH_P_IPV6); 867 #endif 868 } 869 870 if (!other_query || timer_pending(&other_query->timer)) 871 return; 872 873 __br_multicast_send_query(br, port, &br_group); 874 875 time = jiffies; 876 time += own_query->startup_sent < br->multicast_startup_query_count ? 877 br->multicast_startup_query_interval : 878 br->multicast_query_interval; 879 mod_timer(&own_query->timer, time); 880 } 881 882 static void 883 br_multicast_port_query_expired(struct net_bridge_port *port, 884 struct bridge_mcast_own_query *query) 885 { 886 struct net_bridge *br = port->br; 887 888 spin_lock(&br->multicast_lock); 889 if (port->state == BR_STATE_DISABLED || 890 port->state == BR_STATE_BLOCKING) 891 goto out; 892 893 if (query->startup_sent < br->multicast_startup_query_count) 894 query->startup_sent++; 895 896 br_multicast_send_query(port->br, port, query); 897 898 out: 899 spin_unlock(&br->multicast_lock); 900 } 901 902 static void br_ip4_multicast_port_query_expired(unsigned long data) 903 { 904 struct net_bridge_port *port = (void *)data; 905 906 br_multicast_port_query_expired(port, &port->ip4_own_query); 907 } 908 909 #if IS_ENABLED(CONFIG_IPV6) 910 static void br_ip6_multicast_port_query_expired(unsigned long data) 911 { 912 struct net_bridge_port *port = (void *)data; 913 914 br_multicast_port_query_expired(port, &port->ip6_own_query); 915 } 916 #endif 917 918 void br_multicast_add_port(struct net_bridge_port *port) 919 { 920 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 921 922 setup_timer(&port->multicast_router_timer, br_multicast_router_expired, 923 (unsigned long)port); 924 setup_timer(&port->ip4_own_query.timer, 925 br_ip4_multicast_port_query_expired, (unsigned long)port); 926 #if IS_ENABLED(CONFIG_IPV6) 927 setup_timer(&port->ip6_own_query.timer, 928 br_ip6_multicast_port_query_expired, (unsigned long)port); 929 #endif 930 } 931 932 void br_multicast_del_port(struct net_bridge_port *port) 933 { 934 struct net_bridge *br = port->br; 935 struct net_bridge_port_group *pg; 936 struct hlist_node *n; 937 938 /* Take care of the remaining groups, only perm ones should be left */ 939 spin_lock_bh(&br->multicast_lock); 940 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 941 br_multicast_del_pg(br, pg); 942 spin_unlock_bh(&br->multicast_lock); 943 del_timer_sync(&port->multicast_router_timer); 944 } 945 946 static void br_multicast_enable(struct bridge_mcast_own_query *query) 947 { 948 query->startup_sent = 0; 949 950 if (try_to_del_timer_sync(&query->timer) >= 0 || 951 del_timer(&query->timer)) 952 mod_timer(&query->timer, jiffies); 953 } 954 955 void br_multicast_enable_port(struct net_bridge_port *port) 956 { 957 struct net_bridge *br = port->br; 958 959 spin_lock(&br->multicast_lock); 960 if (br->multicast_disabled || !netif_running(br->dev)) 961 goto out; 962 963 br_multicast_enable(&port->ip4_own_query); 964 #if IS_ENABLED(CONFIG_IPV6) 965 br_multicast_enable(&port->ip6_own_query); 966 #endif 967 if (port->multicast_router == MDB_RTR_TYPE_PERM && 968 hlist_unhashed(&port->rlist)) 969 br_multicast_add_router(br, port); 970 971 out: 972 spin_unlock(&br->multicast_lock); 973 } 974 975 void br_multicast_disable_port(struct net_bridge_port *port) 976 { 977 struct net_bridge *br = port->br; 978 struct net_bridge_port_group *pg; 979 struct hlist_node *n; 980 981 spin_lock(&br->multicast_lock); 982 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 983 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT)) 984 br_multicast_del_pg(br, pg); 985 986 if (!hlist_unhashed(&port->rlist)) { 987 hlist_del_init_rcu(&port->rlist); 988 br_rtr_notify(br->dev, port, RTM_DELMDB); 989 /* Don't allow timer refresh if disabling */ 990 if (port->multicast_router == MDB_RTR_TYPE_TEMP) 991 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 992 } 993 del_timer(&port->multicast_router_timer); 994 del_timer(&port->ip4_own_query.timer); 995 #if IS_ENABLED(CONFIG_IPV6) 996 del_timer(&port->ip6_own_query.timer); 997 #endif 998 spin_unlock(&br->multicast_lock); 999 } 1000 1001 static int br_ip4_multicast_igmp3_report(struct net_bridge *br, 1002 struct net_bridge_port *port, 1003 struct sk_buff *skb, 1004 u16 vid) 1005 { 1006 struct igmpv3_report *ih; 1007 struct igmpv3_grec *grec; 1008 int i; 1009 int len; 1010 int num; 1011 int type; 1012 int err = 0; 1013 __be32 group; 1014 1015 ih = igmpv3_report_hdr(skb); 1016 num = ntohs(ih->ngrec); 1017 len = skb_transport_offset(skb) + sizeof(*ih); 1018 1019 for (i = 0; i < num; i++) { 1020 len += sizeof(*grec); 1021 if (!pskb_may_pull(skb, len)) 1022 return -EINVAL; 1023 1024 grec = (void *)(skb->data + len - sizeof(*grec)); 1025 group = grec->grec_mca; 1026 type = grec->grec_type; 1027 1028 len += ntohs(grec->grec_nsrcs) * 4; 1029 if (!pskb_may_pull(skb, len)) 1030 return -EINVAL; 1031 1032 /* We treat this as an IGMPv2 report for now. */ 1033 switch (type) { 1034 case IGMPV3_MODE_IS_INCLUDE: 1035 case IGMPV3_MODE_IS_EXCLUDE: 1036 case IGMPV3_CHANGE_TO_INCLUDE: 1037 case IGMPV3_CHANGE_TO_EXCLUDE: 1038 case IGMPV3_ALLOW_NEW_SOURCES: 1039 case IGMPV3_BLOCK_OLD_SOURCES: 1040 break; 1041 1042 default: 1043 continue; 1044 } 1045 1046 if ((type == IGMPV3_CHANGE_TO_INCLUDE || 1047 type == IGMPV3_MODE_IS_INCLUDE) && 1048 ntohs(grec->grec_nsrcs) == 0) { 1049 br_ip4_multicast_leave_group(br, port, group, vid); 1050 } else { 1051 err = br_ip4_multicast_add_group(br, port, group, vid); 1052 if (err) 1053 break; 1054 } 1055 } 1056 1057 return err; 1058 } 1059 1060 #if IS_ENABLED(CONFIG_IPV6) 1061 static int br_ip6_multicast_mld2_report(struct net_bridge *br, 1062 struct net_bridge_port *port, 1063 struct sk_buff *skb, 1064 u16 vid) 1065 { 1066 struct icmp6hdr *icmp6h; 1067 struct mld2_grec *grec; 1068 int i; 1069 int len; 1070 int num; 1071 int err = 0; 1072 1073 if (!pskb_may_pull(skb, sizeof(*icmp6h))) 1074 return -EINVAL; 1075 1076 icmp6h = icmp6_hdr(skb); 1077 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 1078 len = skb_transport_offset(skb) + sizeof(*icmp6h); 1079 1080 for (i = 0; i < num; i++) { 1081 __be16 *nsrcs, _nsrcs; 1082 1083 nsrcs = skb_header_pointer(skb, 1084 len + offsetof(struct mld2_grec, 1085 grec_nsrcs), 1086 sizeof(_nsrcs), &_nsrcs); 1087 if (!nsrcs) 1088 return -EINVAL; 1089 1090 if (!pskb_may_pull(skb, 1091 len + sizeof(*grec) + 1092 sizeof(struct in6_addr) * ntohs(*nsrcs))) 1093 return -EINVAL; 1094 1095 grec = (struct mld2_grec *)(skb->data + len); 1096 len += sizeof(*grec) + 1097 sizeof(struct in6_addr) * ntohs(*nsrcs); 1098 1099 /* We treat these as MLDv1 reports for now. */ 1100 switch (grec->grec_type) { 1101 case MLD2_MODE_IS_INCLUDE: 1102 case MLD2_MODE_IS_EXCLUDE: 1103 case MLD2_CHANGE_TO_INCLUDE: 1104 case MLD2_CHANGE_TO_EXCLUDE: 1105 case MLD2_ALLOW_NEW_SOURCES: 1106 case MLD2_BLOCK_OLD_SOURCES: 1107 break; 1108 1109 default: 1110 continue; 1111 } 1112 1113 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE || 1114 grec->grec_type == MLD2_MODE_IS_INCLUDE) && 1115 ntohs(*nsrcs) == 0) { 1116 br_ip6_multicast_leave_group(br, port, &grec->grec_mca, 1117 vid); 1118 } else { 1119 err = br_ip6_multicast_add_group(br, port, 1120 &grec->grec_mca, vid); 1121 if (!err) 1122 break; 1123 } 1124 } 1125 1126 return err; 1127 } 1128 #endif 1129 1130 static bool br_ip4_multicast_select_querier(struct net_bridge *br, 1131 struct net_bridge_port *port, 1132 __be32 saddr) 1133 { 1134 if (!timer_pending(&br->ip4_own_query.timer) && 1135 !timer_pending(&br->ip4_other_query.timer)) 1136 goto update; 1137 1138 if (!br->ip4_querier.addr.u.ip4) 1139 goto update; 1140 1141 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4)) 1142 goto update; 1143 1144 return false; 1145 1146 update: 1147 br->ip4_querier.addr.u.ip4 = saddr; 1148 1149 /* update protected by general multicast_lock by caller */ 1150 rcu_assign_pointer(br->ip4_querier.port, port); 1151 1152 return true; 1153 } 1154 1155 #if IS_ENABLED(CONFIG_IPV6) 1156 static bool br_ip6_multicast_select_querier(struct net_bridge *br, 1157 struct net_bridge_port *port, 1158 struct in6_addr *saddr) 1159 { 1160 if (!timer_pending(&br->ip6_own_query.timer) && 1161 !timer_pending(&br->ip6_other_query.timer)) 1162 goto update; 1163 1164 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0) 1165 goto update; 1166 1167 return false; 1168 1169 update: 1170 br->ip6_querier.addr.u.ip6 = *saddr; 1171 1172 /* update protected by general multicast_lock by caller */ 1173 rcu_assign_pointer(br->ip6_querier.port, port); 1174 1175 return true; 1176 } 1177 #endif 1178 1179 static bool br_multicast_select_querier(struct net_bridge *br, 1180 struct net_bridge_port *port, 1181 struct br_ip *saddr) 1182 { 1183 switch (saddr->proto) { 1184 case htons(ETH_P_IP): 1185 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4); 1186 #if IS_ENABLED(CONFIG_IPV6) 1187 case htons(ETH_P_IPV6): 1188 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6); 1189 #endif 1190 } 1191 1192 return false; 1193 } 1194 1195 static void 1196 br_multicast_update_query_timer(struct net_bridge *br, 1197 struct bridge_mcast_other_query *query, 1198 unsigned long max_delay) 1199 { 1200 if (!timer_pending(&query->timer)) 1201 query->delay_time = jiffies + max_delay; 1202 1203 mod_timer(&query->timer, jiffies + br->multicast_querier_interval); 1204 } 1205 1206 /* 1207 * Add port to router_list 1208 * list is maintained ordered by pointer value 1209 * and locked by br->multicast_lock and RCU 1210 */ 1211 static void br_multicast_add_router(struct net_bridge *br, 1212 struct net_bridge_port *port) 1213 { 1214 struct net_bridge_port *p; 1215 struct hlist_node *slot = NULL; 1216 1217 if (!hlist_unhashed(&port->rlist)) 1218 return; 1219 1220 hlist_for_each_entry(p, &br->router_list, rlist) { 1221 if ((unsigned long) port >= (unsigned long) p) 1222 break; 1223 slot = &p->rlist; 1224 } 1225 1226 if (slot) 1227 hlist_add_behind_rcu(&port->rlist, slot); 1228 else 1229 hlist_add_head_rcu(&port->rlist, &br->router_list); 1230 br_rtr_notify(br->dev, port, RTM_NEWMDB); 1231 } 1232 1233 static void br_multicast_mark_router(struct net_bridge *br, 1234 struct net_bridge_port *port) 1235 { 1236 unsigned long now = jiffies; 1237 1238 if (!port) { 1239 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) 1240 mod_timer(&br->multicast_router_timer, 1241 now + br->multicast_querier_interval); 1242 return; 1243 } 1244 1245 if (port->multicast_router == MDB_RTR_TYPE_DISABLED || 1246 port->multicast_router == MDB_RTR_TYPE_PERM) 1247 return; 1248 1249 br_multicast_add_router(br, port); 1250 1251 mod_timer(&port->multicast_router_timer, 1252 now + br->multicast_querier_interval); 1253 } 1254 1255 static void br_multicast_query_received(struct net_bridge *br, 1256 struct net_bridge_port *port, 1257 struct bridge_mcast_other_query *query, 1258 struct br_ip *saddr, 1259 unsigned long max_delay) 1260 { 1261 if (!br_multicast_select_querier(br, port, saddr)) 1262 return; 1263 1264 br_multicast_update_query_timer(br, query, max_delay); 1265 br_multicast_mark_router(br, port); 1266 } 1267 1268 static int br_ip4_multicast_query(struct net_bridge *br, 1269 struct net_bridge_port *port, 1270 struct sk_buff *skb, 1271 u16 vid) 1272 { 1273 const struct iphdr *iph = ip_hdr(skb); 1274 struct igmphdr *ih = igmp_hdr(skb); 1275 struct net_bridge_mdb_entry *mp; 1276 struct igmpv3_query *ih3; 1277 struct net_bridge_port_group *p; 1278 struct net_bridge_port_group __rcu **pp; 1279 struct br_ip saddr; 1280 unsigned long max_delay; 1281 unsigned long now = jiffies; 1282 unsigned int offset = skb_transport_offset(skb); 1283 __be32 group; 1284 int err = 0; 1285 1286 spin_lock(&br->multicast_lock); 1287 if (!netif_running(br->dev) || 1288 (port && port->state == BR_STATE_DISABLED)) 1289 goto out; 1290 1291 group = ih->group; 1292 1293 if (skb->len == offset + sizeof(*ih)) { 1294 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 1295 1296 if (!max_delay) { 1297 max_delay = 10 * HZ; 1298 group = 0; 1299 } 1300 } else if (skb->len >= offset + sizeof(*ih3)) { 1301 ih3 = igmpv3_query_hdr(skb); 1302 if (ih3->nsrcs) 1303 goto out; 1304 1305 max_delay = ih3->code ? 1306 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 1307 } else { 1308 goto out; 1309 } 1310 1311 if (!group) { 1312 saddr.proto = htons(ETH_P_IP); 1313 saddr.u.ip4 = iph->saddr; 1314 1315 br_multicast_query_received(br, port, &br->ip4_other_query, 1316 &saddr, max_delay); 1317 goto out; 1318 } 1319 1320 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid); 1321 if (!mp) 1322 goto out; 1323 1324 max_delay *= br->multicast_last_member_count; 1325 1326 if (mp->mglist && 1327 (timer_pending(&mp->timer) ? 1328 time_after(mp->timer.expires, now + max_delay) : 1329 try_to_del_timer_sync(&mp->timer) >= 0)) 1330 mod_timer(&mp->timer, now + max_delay); 1331 1332 for (pp = &mp->ports; 1333 (p = mlock_dereference(*pp, br)) != NULL; 1334 pp = &p->next) { 1335 if (timer_pending(&p->timer) ? 1336 time_after(p->timer.expires, now + max_delay) : 1337 try_to_del_timer_sync(&p->timer) >= 0) 1338 mod_timer(&p->timer, now + max_delay); 1339 } 1340 1341 out: 1342 spin_unlock(&br->multicast_lock); 1343 return err; 1344 } 1345 1346 #if IS_ENABLED(CONFIG_IPV6) 1347 static int br_ip6_multicast_query(struct net_bridge *br, 1348 struct net_bridge_port *port, 1349 struct sk_buff *skb, 1350 u16 vid) 1351 { 1352 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 1353 struct mld_msg *mld; 1354 struct net_bridge_mdb_entry *mp; 1355 struct mld2_query *mld2q; 1356 struct net_bridge_port_group *p; 1357 struct net_bridge_port_group __rcu **pp; 1358 struct br_ip saddr; 1359 unsigned long max_delay; 1360 unsigned long now = jiffies; 1361 unsigned int offset = skb_transport_offset(skb); 1362 const struct in6_addr *group = NULL; 1363 bool is_general_query; 1364 int err = 0; 1365 1366 spin_lock(&br->multicast_lock); 1367 if (!netif_running(br->dev) || 1368 (port && port->state == BR_STATE_DISABLED)) 1369 goto out; 1370 1371 if (skb->len == offset + sizeof(*mld)) { 1372 if (!pskb_may_pull(skb, offset + sizeof(*mld))) { 1373 err = -EINVAL; 1374 goto out; 1375 } 1376 mld = (struct mld_msg *) icmp6_hdr(skb); 1377 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); 1378 if (max_delay) 1379 group = &mld->mld_mca; 1380 } else { 1381 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) { 1382 err = -EINVAL; 1383 goto out; 1384 } 1385 mld2q = (struct mld2_query *)icmp6_hdr(skb); 1386 if (!mld2q->mld2q_nsrcs) 1387 group = &mld2q->mld2q_mca; 1388 1389 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); 1390 } 1391 1392 is_general_query = group && ipv6_addr_any(group); 1393 1394 if (is_general_query) { 1395 saddr.proto = htons(ETH_P_IPV6); 1396 saddr.u.ip6 = ip6h->saddr; 1397 1398 br_multicast_query_received(br, port, &br->ip6_other_query, 1399 &saddr, max_delay); 1400 goto out; 1401 } else if (!group) { 1402 goto out; 1403 } 1404 1405 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid); 1406 if (!mp) 1407 goto out; 1408 1409 max_delay *= br->multicast_last_member_count; 1410 if (mp->mglist && 1411 (timer_pending(&mp->timer) ? 1412 time_after(mp->timer.expires, now + max_delay) : 1413 try_to_del_timer_sync(&mp->timer) >= 0)) 1414 mod_timer(&mp->timer, now + max_delay); 1415 1416 for (pp = &mp->ports; 1417 (p = mlock_dereference(*pp, br)) != NULL; 1418 pp = &p->next) { 1419 if (timer_pending(&p->timer) ? 1420 time_after(p->timer.expires, now + max_delay) : 1421 try_to_del_timer_sync(&p->timer) >= 0) 1422 mod_timer(&p->timer, now + max_delay); 1423 } 1424 1425 out: 1426 spin_unlock(&br->multicast_lock); 1427 return err; 1428 } 1429 #endif 1430 1431 static void 1432 br_multicast_leave_group(struct net_bridge *br, 1433 struct net_bridge_port *port, 1434 struct br_ip *group, 1435 struct bridge_mcast_other_query *other_query, 1436 struct bridge_mcast_own_query *own_query) 1437 { 1438 struct net_bridge_mdb_htable *mdb; 1439 struct net_bridge_mdb_entry *mp; 1440 struct net_bridge_port_group *p; 1441 unsigned long now; 1442 unsigned long time; 1443 1444 spin_lock(&br->multicast_lock); 1445 if (!netif_running(br->dev) || 1446 (port && port->state == BR_STATE_DISABLED)) 1447 goto out; 1448 1449 mdb = mlock_dereference(br->mdb, br); 1450 mp = br_mdb_ip_get(mdb, group); 1451 if (!mp) 1452 goto out; 1453 1454 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { 1455 struct net_bridge_port_group __rcu **pp; 1456 1457 for (pp = &mp->ports; 1458 (p = mlock_dereference(*pp, br)) != NULL; 1459 pp = &p->next) { 1460 if (p->port != port) 1461 continue; 1462 1463 rcu_assign_pointer(*pp, p->next); 1464 hlist_del_init(&p->mglist); 1465 del_timer(&p->timer); 1466 call_rcu_bh(&p->rcu, br_multicast_free_pg); 1467 br_mdb_notify(br->dev, port, group, RTM_DELMDB, 1468 p->flags); 1469 1470 if (!mp->ports && !mp->mglist && 1471 netif_running(br->dev)) 1472 mod_timer(&mp->timer, jiffies); 1473 } 1474 goto out; 1475 } 1476 1477 if (timer_pending(&other_query->timer)) 1478 goto out; 1479 1480 if (br->multicast_querier) { 1481 __br_multicast_send_query(br, port, &mp->addr); 1482 1483 time = jiffies + br->multicast_last_member_count * 1484 br->multicast_last_member_interval; 1485 1486 mod_timer(&own_query->timer, time); 1487 1488 for (p = mlock_dereference(mp->ports, br); 1489 p != NULL; 1490 p = mlock_dereference(p->next, br)) { 1491 if (p->port != port) 1492 continue; 1493 1494 if (!hlist_unhashed(&p->mglist) && 1495 (timer_pending(&p->timer) ? 1496 time_after(p->timer.expires, time) : 1497 try_to_del_timer_sync(&p->timer) >= 0)) { 1498 mod_timer(&p->timer, time); 1499 } 1500 1501 break; 1502 } 1503 } 1504 1505 now = jiffies; 1506 time = now + br->multicast_last_member_count * 1507 br->multicast_last_member_interval; 1508 1509 if (!port) { 1510 if (mp->mglist && 1511 (timer_pending(&mp->timer) ? 1512 time_after(mp->timer.expires, time) : 1513 try_to_del_timer_sync(&mp->timer) >= 0)) { 1514 mod_timer(&mp->timer, time); 1515 } 1516 1517 goto out; 1518 } 1519 1520 for (p = mlock_dereference(mp->ports, br); 1521 p != NULL; 1522 p = mlock_dereference(p->next, br)) { 1523 if (p->port != port) 1524 continue; 1525 1526 if (!hlist_unhashed(&p->mglist) && 1527 (timer_pending(&p->timer) ? 1528 time_after(p->timer.expires, time) : 1529 try_to_del_timer_sync(&p->timer) >= 0)) { 1530 mod_timer(&p->timer, time); 1531 } 1532 1533 break; 1534 } 1535 out: 1536 spin_unlock(&br->multicast_lock); 1537 } 1538 1539 static void br_ip4_multicast_leave_group(struct net_bridge *br, 1540 struct net_bridge_port *port, 1541 __be32 group, 1542 __u16 vid) 1543 { 1544 struct br_ip br_group; 1545 struct bridge_mcast_own_query *own_query; 1546 1547 if (ipv4_is_local_multicast(group)) 1548 return; 1549 1550 own_query = port ? &port->ip4_own_query : &br->ip4_own_query; 1551 1552 br_group.u.ip4 = group; 1553 br_group.proto = htons(ETH_P_IP); 1554 br_group.vid = vid; 1555 1556 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query, 1557 own_query); 1558 } 1559 1560 #if IS_ENABLED(CONFIG_IPV6) 1561 static void br_ip6_multicast_leave_group(struct net_bridge *br, 1562 struct net_bridge_port *port, 1563 const struct in6_addr *group, 1564 __u16 vid) 1565 { 1566 struct br_ip br_group; 1567 struct bridge_mcast_own_query *own_query; 1568 1569 if (ipv6_addr_is_ll_all_nodes(group)) 1570 return; 1571 1572 own_query = port ? &port->ip6_own_query : &br->ip6_own_query; 1573 1574 br_group.u.ip6 = *group; 1575 br_group.proto = htons(ETH_P_IPV6); 1576 br_group.vid = vid; 1577 1578 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query, 1579 own_query); 1580 } 1581 #endif 1582 1583 static int br_multicast_ipv4_rcv(struct net_bridge *br, 1584 struct net_bridge_port *port, 1585 struct sk_buff *skb, 1586 u16 vid) 1587 { 1588 struct sk_buff *skb_trimmed = NULL; 1589 struct igmphdr *ih; 1590 int err; 1591 1592 err = ip_mc_check_igmp(skb, &skb_trimmed); 1593 1594 if (err == -ENOMSG) { 1595 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) 1596 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1597 return 0; 1598 } else if (err < 0) { 1599 return err; 1600 } 1601 1602 BR_INPUT_SKB_CB(skb)->igmp = 1; 1603 ih = igmp_hdr(skb); 1604 1605 switch (ih->type) { 1606 case IGMP_HOST_MEMBERSHIP_REPORT: 1607 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1608 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1609 err = br_ip4_multicast_add_group(br, port, ih->group, vid); 1610 break; 1611 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1612 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid); 1613 break; 1614 case IGMP_HOST_MEMBERSHIP_QUERY: 1615 err = br_ip4_multicast_query(br, port, skb_trimmed, vid); 1616 break; 1617 case IGMP_HOST_LEAVE_MESSAGE: 1618 br_ip4_multicast_leave_group(br, port, ih->group, vid); 1619 break; 1620 } 1621 1622 if (skb_trimmed && skb_trimmed != skb) 1623 kfree_skb(skb_trimmed); 1624 1625 return err; 1626 } 1627 1628 #if IS_ENABLED(CONFIG_IPV6) 1629 static int br_multicast_ipv6_rcv(struct net_bridge *br, 1630 struct net_bridge_port *port, 1631 struct sk_buff *skb, 1632 u16 vid) 1633 { 1634 struct sk_buff *skb_trimmed = NULL; 1635 struct mld_msg *mld; 1636 int err; 1637 1638 err = ipv6_mc_check_mld(skb, &skb_trimmed); 1639 1640 if (err == -ENOMSG) { 1641 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr)) 1642 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1643 return 0; 1644 } else if (err < 0) { 1645 return err; 1646 } 1647 1648 BR_INPUT_SKB_CB(skb)->igmp = 1; 1649 mld = (struct mld_msg *)skb_transport_header(skb); 1650 1651 switch (mld->mld_type) { 1652 case ICMPV6_MGM_REPORT: 1653 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1654 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid); 1655 break; 1656 case ICMPV6_MLD2_REPORT: 1657 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid); 1658 break; 1659 case ICMPV6_MGM_QUERY: 1660 err = br_ip6_multicast_query(br, port, skb_trimmed, vid); 1661 break; 1662 case ICMPV6_MGM_REDUCTION: 1663 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid); 1664 break; 1665 } 1666 1667 if (skb_trimmed && skb_trimmed != skb) 1668 kfree_skb(skb_trimmed); 1669 1670 return err; 1671 } 1672 #endif 1673 1674 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 1675 struct sk_buff *skb, u16 vid) 1676 { 1677 BR_INPUT_SKB_CB(skb)->igmp = 0; 1678 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 1679 1680 if (br->multicast_disabled) 1681 return 0; 1682 1683 switch (skb->protocol) { 1684 case htons(ETH_P_IP): 1685 return br_multicast_ipv4_rcv(br, port, skb, vid); 1686 #if IS_ENABLED(CONFIG_IPV6) 1687 case htons(ETH_P_IPV6): 1688 return br_multicast_ipv6_rcv(br, port, skb, vid); 1689 #endif 1690 } 1691 1692 return 0; 1693 } 1694 1695 static void br_multicast_query_expired(struct net_bridge *br, 1696 struct bridge_mcast_own_query *query, 1697 struct bridge_mcast_querier *querier) 1698 { 1699 spin_lock(&br->multicast_lock); 1700 if (query->startup_sent < br->multicast_startup_query_count) 1701 query->startup_sent++; 1702 1703 RCU_INIT_POINTER(querier->port, NULL); 1704 br_multicast_send_query(br, NULL, query); 1705 spin_unlock(&br->multicast_lock); 1706 } 1707 1708 static void br_ip4_multicast_query_expired(unsigned long data) 1709 { 1710 struct net_bridge *br = (void *)data; 1711 1712 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier); 1713 } 1714 1715 #if IS_ENABLED(CONFIG_IPV6) 1716 static void br_ip6_multicast_query_expired(unsigned long data) 1717 { 1718 struct net_bridge *br = (void *)data; 1719 1720 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier); 1721 } 1722 #endif 1723 1724 void br_multicast_init(struct net_bridge *br) 1725 { 1726 br->hash_elasticity = 4; 1727 br->hash_max = 512; 1728 1729 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1730 br->multicast_querier = 0; 1731 br->multicast_query_use_ifaddr = 0; 1732 br->multicast_last_member_count = 2; 1733 br->multicast_startup_query_count = 2; 1734 1735 br->multicast_last_member_interval = HZ; 1736 br->multicast_query_response_interval = 10 * HZ; 1737 br->multicast_startup_query_interval = 125 * HZ / 4; 1738 br->multicast_query_interval = 125 * HZ; 1739 br->multicast_querier_interval = 255 * HZ; 1740 br->multicast_membership_interval = 260 * HZ; 1741 1742 br->ip4_other_query.delay_time = 0; 1743 br->ip4_querier.port = NULL; 1744 #if IS_ENABLED(CONFIG_IPV6) 1745 br->ip6_other_query.delay_time = 0; 1746 br->ip6_querier.port = NULL; 1747 #endif 1748 1749 spin_lock_init(&br->multicast_lock); 1750 setup_timer(&br->multicast_router_timer, 1751 br_multicast_local_router_expired, 0); 1752 setup_timer(&br->ip4_other_query.timer, 1753 br_ip4_multicast_querier_expired, (unsigned long)br); 1754 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired, 1755 (unsigned long)br); 1756 #if IS_ENABLED(CONFIG_IPV6) 1757 setup_timer(&br->ip6_other_query.timer, 1758 br_ip6_multicast_querier_expired, (unsigned long)br); 1759 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired, 1760 (unsigned long)br); 1761 #endif 1762 } 1763 1764 static void __br_multicast_open(struct net_bridge *br, 1765 struct bridge_mcast_own_query *query) 1766 { 1767 query->startup_sent = 0; 1768 1769 if (br->multicast_disabled) 1770 return; 1771 1772 mod_timer(&query->timer, jiffies); 1773 } 1774 1775 void br_multicast_open(struct net_bridge *br) 1776 { 1777 __br_multicast_open(br, &br->ip4_own_query); 1778 #if IS_ENABLED(CONFIG_IPV6) 1779 __br_multicast_open(br, &br->ip6_own_query); 1780 #endif 1781 } 1782 1783 void br_multicast_stop(struct net_bridge *br) 1784 { 1785 del_timer_sync(&br->multicast_router_timer); 1786 del_timer_sync(&br->ip4_other_query.timer); 1787 del_timer_sync(&br->ip4_own_query.timer); 1788 #if IS_ENABLED(CONFIG_IPV6) 1789 del_timer_sync(&br->ip6_other_query.timer); 1790 del_timer_sync(&br->ip6_own_query.timer); 1791 #endif 1792 } 1793 1794 void br_multicast_dev_del(struct net_bridge *br) 1795 { 1796 struct net_bridge_mdb_htable *mdb; 1797 struct net_bridge_mdb_entry *mp; 1798 struct hlist_node *n; 1799 u32 ver; 1800 int i; 1801 1802 spin_lock_bh(&br->multicast_lock); 1803 mdb = mlock_dereference(br->mdb, br); 1804 if (!mdb) 1805 goto out; 1806 1807 br->mdb = NULL; 1808 1809 ver = mdb->ver; 1810 for (i = 0; i < mdb->max; i++) { 1811 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i], 1812 hlist[ver]) { 1813 del_timer(&mp->timer); 1814 call_rcu_bh(&mp->rcu, br_multicast_free_group); 1815 } 1816 } 1817 1818 if (mdb->old) { 1819 spin_unlock_bh(&br->multicast_lock); 1820 rcu_barrier_bh(); 1821 spin_lock_bh(&br->multicast_lock); 1822 WARN_ON(mdb->old); 1823 } 1824 1825 mdb->old = mdb; 1826 call_rcu_bh(&mdb->rcu, br_mdb_free); 1827 1828 out: 1829 spin_unlock_bh(&br->multicast_lock); 1830 } 1831 1832 int br_multicast_set_router(struct net_bridge *br, unsigned long val) 1833 { 1834 int err = -EINVAL; 1835 1836 spin_lock_bh(&br->multicast_lock); 1837 1838 switch (val) { 1839 case MDB_RTR_TYPE_DISABLED: 1840 case MDB_RTR_TYPE_PERM: 1841 del_timer(&br->multicast_router_timer); 1842 /* fall through */ 1843 case MDB_RTR_TYPE_TEMP_QUERY: 1844 br->multicast_router = val; 1845 err = 0; 1846 break; 1847 } 1848 1849 spin_unlock_bh(&br->multicast_lock); 1850 1851 return err; 1852 } 1853 1854 static void __del_port_router(struct net_bridge_port *p) 1855 { 1856 if (hlist_unhashed(&p->rlist)) 1857 return; 1858 hlist_del_init_rcu(&p->rlist); 1859 br_rtr_notify(p->br->dev, p, RTM_DELMDB); 1860 } 1861 1862 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) 1863 { 1864 struct net_bridge *br = p->br; 1865 unsigned long now = jiffies; 1866 int err = -EINVAL; 1867 1868 spin_lock(&br->multicast_lock); 1869 if (p->multicast_router == val) { 1870 /* Refresh the temp router port timer */ 1871 if (p->multicast_router == MDB_RTR_TYPE_TEMP) 1872 mod_timer(&p->multicast_router_timer, 1873 now + br->multicast_querier_interval); 1874 err = 0; 1875 goto unlock; 1876 } 1877 switch (val) { 1878 case MDB_RTR_TYPE_DISABLED: 1879 p->multicast_router = MDB_RTR_TYPE_DISABLED; 1880 __del_port_router(p); 1881 del_timer(&p->multicast_router_timer); 1882 break; 1883 case MDB_RTR_TYPE_TEMP_QUERY: 1884 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1885 __del_port_router(p); 1886 break; 1887 case MDB_RTR_TYPE_PERM: 1888 p->multicast_router = MDB_RTR_TYPE_PERM; 1889 del_timer(&p->multicast_router_timer); 1890 br_multicast_add_router(br, p); 1891 break; 1892 case MDB_RTR_TYPE_TEMP: 1893 p->multicast_router = MDB_RTR_TYPE_TEMP; 1894 br_multicast_mark_router(br, p); 1895 break; 1896 default: 1897 goto unlock; 1898 } 1899 err = 0; 1900 unlock: 1901 spin_unlock(&br->multicast_lock); 1902 1903 return err; 1904 } 1905 1906 static void br_multicast_start_querier(struct net_bridge *br, 1907 struct bridge_mcast_own_query *query) 1908 { 1909 struct net_bridge_port *port; 1910 1911 __br_multicast_open(br, query); 1912 1913 list_for_each_entry(port, &br->port_list, list) { 1914 if (port->state == BR_STATE_DISABLED || 1915 port->state == BR_STATE_BLOCKING) 1916 continue; 1917 1918 if (query == &br->ip4_own_query) 1919 br_multicast_enable(&port->ip4_own_query); 1920 #if IS_ENABLED(CONFIG_IPV6) 1921 else 1922 br_multicast_enable(&port->ip6_own_query); 1923 #endif 1924 } 1925 } 1926 1927 int br_multicast_toggle(struct net_bridge *br, unsigned long val) 1928 { 1929 int err = 0; 1930 struct net_bridge_mdb_htable *mdb; 1931 1932 spin_lock_bh(&br->multicast_lock); 1933 if (br->multicast_disabled == !val) 1934 goto unlock; 1935 1936 br->multicast_disabled = !val; 1937 if (br->multicast_disabled) 1938 goto unlock; 1939 1940 if (!netif_running(br->dev)) 1941 goto unlock; 1942 1943 mdb = mlock_dereference(br->mdb, br); 1944 if (mdb) { 1945 if (mdb->old) { 1946 err = -EEXIST; 1947 rollback: 1948 br->multicast_disabled = !!val; 1949 goto unlock; 1950 } 1951 1952 err = br_mdb_rehash(&br->mdb, mdb->max, 1953 br->hash_elasticity); 1954 if (err) 1955 goto rollback; 1956 } 1957 1958 br_multicast_start_querier(br, &br->ip4_own_query); 1959 #if IS_ENABLED(CONFIG_IPV6) 1960 br_multicast_start_querier(br, &br->ip6_own_query); 1961 #endif 1962 1963 unlock: 1964 spin_unlock_bh(&br->multicast_lock); 1965 1966 return err; 1967 } 1968 1969 int br_multicast_set_querier(struct net_bridge *br, unsigned long val) 1970 { 1971 unsigned long max_delay; 1972 1973 val = !!val; 1974 1975 spin_lock_bh(&br->multicast_lock); 1976 if (br->multicast_querier == val) 1977 goto unlock; 1978 1979 br->multicast_querier = val; 1980 if (!val) 1981 goto unlock; 1982 1983 max_delay = br->multicast_query_response_interval; 1984 1985 if (!timer_pending(&br->ip4_other_query.timer)) 1986 br->ip4_other_query.delay_time = jiffies + max_delay; 1987 1988 br_multicast_start_querier(br, &br->ip4_own_query); 1989 1990 #if IS_ENABLED(CONFIG_IPV6) 1991 if (!timer_pending(&br->ip6_other_query.timer)) 1992 br->ip6_other_query.delay_time = jiffies + max_delay; 1993 1994 br_multicast_start_querier(br, &br->ip6_own_query); 1995 #endif 1996 1997 unlock: 1998 spin_unlock_bh(&br->multicast_lock); 1999 2000 return 0; 2001 } 2002 2003 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) 2004 { 2005 int err = -EINVAL; 2006 u32 old; 2007 struct net_bridge_mdb_htable *mdb; 2008 2009 spin_lock_bh(&br->multicast_lock); 2010 if (!is_power_of_2(val)) 2011 goto unlock; 2012 2013 mdb = mlock_dereference(br->mdb, br); 2014 if (mdb && val < mdb->size) 2015 goto unlock; 2016 2017 err = 0; 2018 2019 old = br->hash_max; 2020 br->hash_max = val; 2021 2022 if (mdb) { 2023 if (mdb->old) { 2024 err = -EEXIST; 2025 rollback: 2026 br->hash_max = old; 2027 goto unlock; 2028 } 2029 2030 err = br_mdb_rehash(&br->mdb, br->hash_max, 2031 br->hash_elasticity); 2032 if (err) 2033 goto rollback; 2034 } 2035 2036 unlock: 2037 spin_unlock_bh(&br->multicast_lock); 2038 2039 return err; 2040 } 2041 2042 /** 2043 * br_multicast_list_adjacent - Returns snooped multicast addresses 2044 * @dev: The bridge port adjacent to which to retrieve addresses 2045 * @br_ip_list: The list to store found, snooped multicast IP addresses in 2046 * 2047 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast 2048 * snooping feature on all bridge ports of dev's bridge device, excluding 2049 * the addresses from dev itself. 2050 * 2051 * Returns the number of items added to br_ip_list. 2052 * 2053 * Notes: 2054 * - br_ip_list needs to be initialized by caller 2055 * - br_ip_list might contain duplicates in the end 2056 * (needs to be taken care of by caller) 2057 * - br_ip_list needs to be freed by caller 2058 */ 2059 int br_multicast_list_adjacent(struct net_device *dev, 2060 struct list_head *br_ip_list) 2061 { 2062 struct net_bridge *br; 2063 struct net_bridge_port *port; 2064 struct net_bridge_port_group *group; 2065 struct br_ip_list *entry; 2066 int count = 0; 2067 2068 rcu_read_lock(); 2069 if (!br_ip_list || !br_port_exists(dev)) 2070 goto unlock; 2071 2072 port = br_port_get_rcu(dev); 2073 if (!port || !port->br) 2074 goto unlock; 2075 2076 br = port->br; 2077 2078 list_for_each_entry_rcu(port, &br->port_list, list) { 2079 if (!port->dev || port->dev == dev) 2080 continue; 2081 2082 hlist_for_each_entry_rcu(group, &port->mglist, mglist) { 2083 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 2084 if (!entry) 2085 goto unlock; 2086 2087 entry->addr = group->addr; 2088 list_add(&entry->list, br_ip_list); 2089 count++; 2090 } 2091 } 2092 2093 unlock: 2094 rcu_read_unlock(); 2095 return count; 2096 } 2097 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); 2098 2099 /** 2100 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge 2101 * @dev: The bridge port providing the bridge on which to check for a querier 2102 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 2103 * 2104 * Checks whether the given interface has a bridge on top and if so returns 2105 * true if a valid querier exists anywhere on the bridged link layer. 2106 * Otherwise returns false. 2107 */ 2108 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto) 2109 { 2110 struct net_bridge *br; 2111 struct net_bridge_port *port; 2112 struct ethhdr eth; 2113 bool ret = false; 2114 2115 rcu_read_lock(); 2116 if (!br_port_exists(dev)) 2117 goto unlock; 2118 2119 port = br_port_get_rcu(dev); 2120 if (!port || !port->br) 2121 goto unlock; 2122 2123 br = port->br; 2124 2125 memset(ð, 0, sizeof(eth)); 2126 eth.h_proto = htons(proto); 2127 2128 ret = br_multicast_querier_exists(br, ð); 2129 2130 unlock: 2131 rcu_read_unlock(); 2132 return ret; 2133 } 2134 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere); 2135 2136 /** 2137 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port 2138 * @dev: The bridge port adjacent to which to check for a querier 2139 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 2140 * 2141 * Checks whether the given interface has a bridge on top and if so returns 2142 * true if a selected querier is behind one of the other ports of this 2143 * bridge. Otherwise returns false. 2144 */ 2145 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) 2146 { 2147 struct net_bridge *br; 2148 struct net_bridge_port *port; 2149 bool ret = false; 2150 2151 rcu_read_lock(); 2152 if (!br_port_exists(dev)) 2153 goto unlock; 2154 2155 port = br_port_get_rcu(dev); 2156 if (!port || !port->br) 2157 goto unlock; 2158 2159 br = port->br; 2160 2161 switch (proto) { 2162 case ETH_P_IP: 2163 if (!timer_pending(&br->ip4_other_query.timer) || 2164 rcu_dereference(br->ip4_querier.port) == port) 2165 goto unlock; 2166 break; 2167 #if IS_ENABLED(CONFIG_IPV6) 2168 case ETH_P_IPV6: 2169 if (!timer_pending(&br->ip6_other_query.timer) || 2170 rcu_dereference(br->ip6_querier.port) == port) 2171 goto unlock; 2172 break; 2173 #endif 2174 default: 2175 goto unlock; 2176 } 2177 2178 ret = true; 2179 unlock: 2180 rcu_read_unlock(); 2181 return ret; 2182 } 2183 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); 2184