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/if_ether.h> 15 #include <linux/igmp.h> 16 #include <linux/jhash.h> 17 #include <linux/kernel.h> 18 #include <linux/log2.h> 19 #include <linux/netdevice.h> 20 #include <linux/netfilter_bridge.h> 21 #include <linux/random.h> 22 #include <linux/rculist.h> 23 #include <linux/skbuff.h> 24 #include <linux/slab.h> 25 #include <linux/timer.h> 26 #include <net/ip.h> 27 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 28 #include <net/ipv6.h> 29 #include <net/mld.h> 30 #include <net/addrconf.h> 31 #include <net/ip6_checksum.h> 32 #endif 33 34 #include "br_private.h" 35 36 #define mlock_dereference(X, br) \ 37 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 38 39 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 40 static inline int ipv6_is_local_multicast(const struct in6_addr *addr) 41 { 42 if (ipv6_addr_is_multicast(addr) && 43 IPV6_ADDR_MC_SCOPE(addr) <= IPV6_ADDR_SCOPE_LINKLOCAL) 44 return 1; 45 return 0; 46 } 47 #endif 48 49 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) 50 { 51 if (a->proto != b->proto) 52 return 0; 53 switch (a->proto) { 54 case htons(ETH_P_IP): 55 return a->u.ip4 == b->u.ip4; 56 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 57 case htons(ETH_P_IPV6): 58 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); 59 #endif 60 } 61 return 0; 62 } 63 64 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip) 65 { 66 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1); 67 } 68 69 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 70 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, 71 const struct in6_addr *ip) 72 { 73 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1); 74 } 75 #endif 76 77 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, 78 struct br_ip *ip) 79 { 80 switch (ip->proto) { 81 case htons(ETH_P_IP): 82 return __br_ip4_hash(mdb, ip->u.ip4); 83 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 84 case htons(ETH_P_IPV6): 85 return __br_ip6_hash(mdb, &ip->u.ip6); 86 #endif 87 } 88 return 0; 89 } 90 91 static struct net_bridge_mdb_entry *__br_mdb_ip_get( 92 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) 93 { 94 struct net_bridge_mdb_entry *mp; 95 struct hlist_node *p; 96 97 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { 98 if (br_ip_equal(&mp->addr, dst)) 99 return mp; 100 } 101 102 return NULL; 103 } 104 105 static struct net_bridge_mdb_entry *br_mdb_ip_get( 106 struct net_bridge_mdb_htable *mdb, struct br_ip *dst) 107 { 108 if (!mdb) 109 return NULL; 110 111 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); 112 } 113 114 static struct net_bridge_mdb_entry *br_mdb_ip4_get( 115 struct net_bridge_mdb_htable *mdb, __be32 dst) 116 { 117 struct br_ip br_dst; 118 119 br_dst.u.ip4 = dst; 120 br_dst.proto = htons(ETH_P_IP); 121 122 return br_mdb_ip_get(mdb, &br_dst); 123 } 124 125 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 126 static struct net_bridge_mdb_entry *br_mdb_ip6_get( 127 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst) 128 { 129 struct br_ip br_dst; 130 131 ipv6_addr_copy(&br_dst.u.ip6, dst); 132 br_dst.proto = htons(ETH_P_IPV6); 133 134 return br_mdb_ip_get(mdb, &br_dst); 135 } 136 #endif 137 138 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 139 struct sk_buff *skb) 140 { 141 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb); 142 struct br_ip ip; 143 144 if (br->multicast_disabled) 145 return NULL; 146 147 if (BR_INPUT_SKB_CB(skb)->igmp) 148 return NULL; 149 150 ip.proto = skb->protocol; 151 152 switch (skb->protocol) { 153 case htons(ETH_P_IP): 154 ip.u.ip4 = ip_hdr(skb)->daddr; 155 break; 156 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 157 case htons(ETH_P_IPV6): 158 ipv6_addr_copy(&ip.u.ip6, &ipv6_hdr(skb)->daddr); 159 break; 160 #endif 161 default: 162 return NULL; 163 } 164 165 return br_mdb_ip_get(mdb, &ip); 166 } 167 168 static void br_mdb_free(struct rcu_head *head) 169 { 170 struct net_bridge_mdb_htable *mdb = 171 container_of(head, struct net_bridge_mdb_htable, rcu); 172 struct net_bridge_mdb_htable *old = mdb->old; 173 174 mdb->old = NULL; 175 kfree(old->mhash); 176 kfree(old); 177 } 178 179 static int br_mdb_copy(struct net_bridge_mdb_htable *new, 180 struct net_bridge_mdb_htable *old, 181 int elasticity) 182 { 183 struct net_bridge_mdb_entry *mp; 184 struct hlist_node *p; 185 int maxlen; 186 int len; 187 int i; 188 189 for (i = 0; i < old->max; i++) 190 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver]) 191 hlist_add_head(&mp->hlist[new->ver], 192 &new->mhash[br_ip_hash(new, &mp->addr)]); 193 194 if (!elasticity) 195 return 0; 196 197 maxlen = 0; 198 for (i = 0; i < new->max; i++) { 199 len = 0; 200 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver]) 201 len++; 202 if (len > maxlen) 203 maxlen = len; 204 } 205 206 return maxlen > elasticity ? -EINVAL : 0; 207 } 208 209 static void br_multicast_free_pg(struct rcu_head *head) 210 { 211 struct net_bridge_port_group *p = 212 container_of(head, struct net_bridge_port_group, rcu); 213 214 kfree(p); 215 } 216 217 static void br_multicast_free_group(struct rcu_head *head) 218 { 219 struct net_bridge_mdb_entry *mp = 220 container_of(head, struct net_bridge_mdb_entry, rcu); 221 222 kfree(mp); 223 } 224 225 static void br_multicast_group_expired(unsigned long data) 226 { 227 struct net_bridge_mdb_entry *mp = (void *)data; 228 struct net_bridge *br = mp->br; 229 struct net_bridge_mdb_htable *mdb; 230 231 spin_lock(&br->multicast_lock); 232 if (!netif_running(br->dev) || timer_pending(&mp->timer)) 233 goto out; 234 235 mp->mglist = false; 236 237 if (mp->ports) 238 goto out; 239 240 mdb = mlock_dereference(br->mdb, br); 241 242 hlist_del_rcu(&mp->hlist[mdb->ver]); 243 mdb->size--; 244 245 del_timer(&mp->query_timer); 246 call_rcu_bh(&mp->rcu, br_multicast_free_group); 247 248 out: 249 spin_unlock(&br->multicast_lock); 250 } 251 252 static void br_multicast_del_pg(struct net_bridge *br, 253 struct net_bridge_port_group *pg) 254 { 255 struct net_bridge_mdb_htable *mdb; 256 struct net_bridge_mdb_entry *mp; 257 struct net_bridge_port_group *p; 258 struct net_bridge_port_group __rcu **pp; 259 260 mdb = mlock_dereference(br->mdb, br); 261 262 mp = br_mdb_ip_get(mdb, &pg->addr); 263 if (WARN_ON(!mp)) 264 return; 265 266 for (pp = &mp->ports; 267 (p = mlock_dereference(*pp, br)) != NULL; 268 pp = &p->next) { 269 if (p != pg) 270 continue; 271 272 rcu_assign_pointer(*pp, p->next); 273 hlist_del_init(&p->mglist); 274 del_timer(&p->timer); 275 del_timer(&p->query_timer); 276 call_rcu_bh(&p->rcu, br_multicast_free_pg); 277 278 if (!mp->ports && !mp->mglist && 279 netif_running(br->dev)) 280 mod_timer(&mp->timer, jiffies); 281 282 return; 283 } 284 285 WARN_ON(1); 286 } 287 288 static void br_multicast_port_group_expired(unsigned long data) 289 { 290 struct net_bridge_port_group *pg = (void *)data; 291 struct net_bridge *br = pg->port->br; 292 293 spin_lock(&br->multicast_lock); 294 if (!netif_running(br->dev) || timer_pending(&pg->timer) || 295 hlist_unhashed(&pg->mglist)) 296 goto out; 297 298 br_multicast_del_pg(br, pg); 299 300 out: 301 spin_unlock(&br->multicast_lock); 302 } 303 304 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, 305 int elasticity) 306 { 307 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); 308 struct net_bridge_mdb_htable *mdb; 309 int err; 310 311 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); 312 if (!mdb) 313 return -ENOMEM; 314 315 mdb->max = max; 316 mdb->old = old; 317 318 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); 319 if (!mdb->mhash) { 320 kfree(mdb); 321 return -ENOMEM; 322 } 323 324 mdb->size = old ? old->size : 0; 325 mdb->ver = old ? old->ver ^ 1 : 0; 326 327 if (!old || elasticity) 328 get_random_bytes(&mdb->secret, sizeof(mdb->secret)); 329 else 330 mdb->secret = old->secret; 331 332 if (!old) 333 goto out; 334 335 err = br_mdb_copy(mdb, old, elasticity); 336 if (err) { 337 kfree(mdb->mhash); 338 kfree(mdb); 339 return err; 340 } 341 342 call_rcu_bh(&mdb->rcu, br_mdb_free); 343 344 out: 345 rcu_assign_pointer(*mdbp, mdb); 346 347 return 0; 348 } 349 350 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, 351 __be32 group) 352 { 353 struct sk_buff *skb; 354 struct igmphdr *ih; 355 struct ethhdr *eth; 356 struct iphdr *iph; 357 358 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + 359 sizeof(*ih) + 4); 360 if (!skb) 361 goto out; 362 363 skb->protocol = htons(ETH_P_IP); 364 365 skb_reset_mac_header(skb); 366 eth = eth_hdr(skb); 367 368 memcpy(eth->h_source, br->dev->dev_addr, 6); 369 eth->h_dest[0] = 1; 370 eth->h_dest[1] = 0; 371 eth->h_dest[2] = 0x5e; 372 eth->h_dest[3] = 0; 373 eth->h_dest[4] = 0; 374 eth->h_dest[5] = 1; 375 eth->h_proto = htons(ETH_P_IP); 376 skb_put(skb, sizeof(*eth)); 377 378 skb_set_network_header(skb, skb->len); 379 iph = ip_hdr(skb); 380 381 iph->version = 4; 382 iph->ihl = 6; 383 iph->tos = 0xc0; 384 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); 385 iph->id = 0; 386 iph->frag_off = htons(IP_DF); 387 iph->ttl = 1; 388 iph->protocol = IPPROTO_IGMP; 389 iph->saddr = 0; 390 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); 391 ((u8 *)&iph[1])[0] = IPOPT_RA; 392 ((u8 *)&iph[1])[1] = 4; 393 ((u8 *)&iph[1])[2] = 0; 394 ((u8 *)&iph[1])[3] = 0; 395 ip_send_check(iph); 396 skb_put(skb, 24); 397 398 skb_set_transport_header(skb, skb->len); 399 ih = igmp_hdr(skb); 400 ih->type = IGMP_HOST_MEMBERSHIP_QUERY; 401 ih->code = (group ? br->multicast_last_member_interval : 402 br->multicast_query_response_interval) / 403 (HZ / IGMP_TIMER_SCALE); 404 ih->group = group; 405 ih->csum = 0; 406 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 407 skb_put(skb, sizeof(*ih)); 408 409 __skb_pull(skb, sizeof(*eth)); 410 411 out: 412 return skb; 413 } 414 415 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 416 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, 417 struct in6_addr *group) 418 { 419 struct sk_buff *skb; 420 struct ipv6hdr *ip6h; 421 struct mld_msg *mldq; 422 struct ethhdr *eth; 423 u8 *hopopt; 424 unsigned long interval; 425 426 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + 427 8 + sizeof(*mldq)); 428 if (!skb) 429 goto out; 430 431 skb->protocol = htons(ETH_P_IPV6); 432 433 /* Ethernet header */ 434 skb_reset_mac_header(skb); 435 eth = eth_hdr(skb); 436 437 memcpy(eth->h_source, br->dev->dev_addr, 6); 438 ipv6_eth_mc_map(group, eth->h_dest); 439 eth->h_proto = htons(ETH_P_IPV6); 440 skb_put(skb, sizeof(*eth)); 441 442 /* IPv6 header + HbH option */ 443 skb_set_network_header(skb, skb->len); 444 ip6h = ipv6_hdr(skb); 445 446 *(__force __be32 *)ip6h = htonl(0x60000000); 447 ip6h->payload_len = htons(8 + sizeof(*mldq)); 448 ip6h->nexthdr = IPPROTO_HOPOPTS; 449 ip6h->hop_limit = 1; 450 ipv6_addr_set(&ip6h->saddr, 0, 0, 0, 0); 451 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); 452 453 hopopt = (u8 *)(ip6h + 1); 454 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ 455 hopopt[1] = 0; /* length of HbH */ 456 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ 457 hopopt[3] = 2; /* Length of RA Option */ 458 hopopt[4] = 0; /* Type = 0x0000 (MLD) */ 459 hopopt[5] = 0; 460 hopopt[6] = IPV6_TLV_PAD0; /* Pad0 */ 461 hopopt[7] = IPV6_TLV_PAD0; /* Pad0 */ 462 463 skb_put(skb, sizeof(*ip6h) + 8); 464 465 /* ICMPv6 */ 466 skb_set_transport_header(skb, skb->len); 467 mldq = (struct mld_msg *) icmp6_hdr(skb); 468 469 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval : 470 br->multicast_query_response_interval; 471 472 mldq->mld_type = ICMPV6_MGM_QUERY; 473 mldq->mld_code = 0; 474 mldq->mld_cksum = 0; 475 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); 476 mldq->mld_reserved = 0; 477 ipv6_addr_copy(&mldq->mld_mca, group); 478 479 /* checksum */ 480 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 481 sizeof(*mldq), IPPROTO_ICMPV6, 482 csum_partial(mldq, 483 sizeof(*mldq), 0)); 484 skb_put(skb, sizeof(*mldq)); 485 486 __skb_pull(skb, sizeof(*eth)); 487 488 out: 489 return skb; 490 } 491 #endif 492 493 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, 494 struct br_ip *addr) 495 { 496 switch (addr->proto) { 497 case htons(ETH_P_IP): 498 return br_ip4_multicast_alloc_query(br, addr->u.ip4); 499 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 500 case htons(ETH_P_IPV6): 501 return br_ip6_multicast_alloc_query(br, &addr->u.ip6); 502 #endif 503 } 504 return NULL; 505 } 506 507 static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp) 508 { 509 struct net_bridge *br = mp->br; 510 struct sk_buff *skb; 511 512 skb = br_multicast_alloc_query(br, &mp->addr); 513 if (!skb) 514 goto timer; 515 516 netif_rx(skb); 517 518 timer: 519 if (++mp->queries_sent < br->multicast_last_member_count) 520 mod_timer(&mp->query_timer, 521 jiffies + br->multicast_last_member_interval); 522 } 523 524 static void br_multicast_group_query_expired(unsigned long data) 525 { 526 struct net_bridge_mdb_entry *mp = (void *)data; 527 struct net_bridge *br = mp->br; 528 529 spin_lock(&br->multicast_lock); 530 if (!netif_running(br->dev) || !mp->mglist || 531 mp->queries_sent >= br->multicast_last_member_count) 532 goto out; 533 534 br_multicast_send_group_query(mp); 535 536 out: 537 spin_unlock(&br->multicast_lock); 538 } 539 540 static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg) 541 { 542 struct net_bridge_port *port = pg->port; 543 struct net_bridge *br = port->br; 544 struct sk_buff *skb; 545 546 skb = br_multicast_alloc_query(br, &pg->addr); 547 if (!skb) 548 goto timer; 549 550 br_deliver(port, skb); 551 552 timer: 553 if (++pg->queries_sent < br->multicast_last_member_count) 554 mod_timer(&pg->query_timer, 555 jiffies + br->multicast_last_member_interval); 556 } 557 558 static void br_multicast_port_group_query_expired(unsigned long data) 559 { 560 struct net_bridge_port_group *pg = (void *)data; 561 struct net_bridge_port *port = pg->port; 562 struct net_bridge *br = port->br; 563 564 spin_lock(&br->multicast_lock); 565 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) || 566 pg->queries_sent >= br->multicast_last_member_count) 567 goto out; 568 569 br_multicast_send_port_group_query(pg); 570 571 out: 572 spin_unlock(&br->multicast_lock); 573 } 574 575 static struct net_bridge_mdb_entry *br_multicast_get_group( 576 struct net_bridge *br, struct net_bridge_port *port, 577 struct br_ip *group, int hash) 578 { 579 struct net_bridge_mdb_htable *mdb; 580 struct net_bridge_mdb_entry *mp; 581 struct hlist_node *p; 582 unsigned count = 0; 583 unsigned max; 584 int elasticity; 585 int err; 586 587 mdb = rcu_dereference_protected(br->mdb, 1); 588 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { 589 count++; 590 if (unlikely(br_ip_equal(group, &mp->addr))) 591 return mp; 592 } 593 594 elasticity = 0; 595 max = mdb->max; 596 597 if (unlikely(count > br->hash_elasticity && count)) { 598 if (net_ratelimit()) 599 br_info(br, "Multicast hash table " 600 "chain limit reached: %s\n", 601 port ? port->dev->name : br->dev->name); 602 603 elasticity = br->hash_elasticity; 604 } 605 606 if (mdb->size >= max) { 607 max *= 2; 608 if (unlikely(max >= br->hash_max)) { 609 br_warn(br, "Multicast hash table maximum " 610 "reached, disabling snooping: %s, %d\n", 611 port ? port->dev->name : br->dev->name, max); 612 err = -E2BIG; 613 disable: 614 br->multicast_disabled = 1; 615 goto err; 616 } 617 } 618 619 if (max > mdb->max || elasticity) { 620 if (mdb->old) { 621 if (net_ratelimit()) 622 br_info(br, "Multicast hash table " 623 "on fire: %s\n", 624 port ? port->dev->name : br->dev->name); 625 err = -EEXIST; 626 goto err; 627 } 628 629 err = br_mdb_rehash(&br->mdb, max, elasticity); 630 if (err) { 631 br_warn(br, "Cannot rehash multicast " 632 "hash table, disabling snooping: %s, %d, %d\n", 633 port ? port->dev->name : br->dev->name, 634 mdb->size, err); 635 goto disable; 636 } 637 638 err = -EAGAIN; 639 goto err; 640 } 641 642 return NULL; 643 644 err: 645 mp = ERR_PTR(err); 646 return mp; 647 } 648 649 static struct net_bridge_mdb_entry *br_multicast_new_group( 650 struct net_bridge *br, struct net_bridge_port *port, 651 struct br_ip *group) 652 { 653 struct net_bridge_mdb_htable *mdb; 654 struct net_bridge_mdb_entry *mp; 655 int hash; 656 int err; 657 658 mdb = rcu_dereference_protected(br->mdb, 1); 659 if (!mdb) { 660 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); 661 if (err) 662 return ERR_PTR(err); 663 goto rehash; 664 } 665 666 hash = br_ip_hash(mdb, group); 667 mp = br_multicast_get_group(br, port, group, hash); 668 switch (PTR_ERR(mp)) { 669 case 0: 670 break; 671 672 case -EAGAIN: 673 rehash: 674 mdb = rcu_dereference_protected(br->mdb, 1); 675 hash = br_ip_hash(mdb, group); 676 break; 677 678 default: 679 goto out; 680 } 681 682 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 683 if (unlikely(!mp)) 684 return ERR_PTR(-ENOMEM); 685 686 mp->br = br; 687 mp->addr = *group; 688 setup_timer(&mp->timer, br_multicast_group_expired, 689 (unsigned long)mp); 690 setup_timer(&mp->query_timer, br_multicast_group_query_expired, 691 (unsigned long)mp); 692 693 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); 694 mdb->size++; 695 696 out: 697 return mp; 698 } 699 700 static int br_multicast_add_group(struct net_bridge *br, 701 struct net_bridge_port *port, 702 struct br_ip *group) 703 { 704 struct net_bridge_mdb_entry *mp; 705 struct net_bridge_port_group *p; 706 struct net_bridge_port_group __rcu **pp; 707 unsigned long now = jiffies; 708 int err; 709 710 spin_lock(&br->multicast_lock); 711 if (!netif_running(br->dev) || 712 (port && port->state == BR_STATE_DISABLED)) 713 goto out; 714 715 mp = br_multicast_new_group(br, port, group); 716 err = PTR_ERR(mp); 717 if (IS_ERR(mp)) 718 goto err; 719 720 if (!port) { 721 mp->mglist = true; 722 mod_timer(&mp->timer, now + br->multicast_membership_interval); 723 goto out; 724 } 725 726 for (pp = &mp->ports; 727 (p = mlock_dereference(*pp, br)) != NULL; 728 pp = &p->next) { 729 if (p->port == port) 730 goto found; 731 if ((unsigned long)p->port < (unsigned long)port) 732 break; 733 } 734 735 p = kzalloc(sizeof(*p), GFP_ATOMIC); 736 err = -ENOMEM; 737 if (unlikely(!p)) 738 goto err; 739 740 p->addr = *group; 741 p->port = port; 742 p->next = *pp; 743 hlist_add_head(&p->mglist, &port->mglist); 744 setup_timer(&p->timer, br_multicast_port_group_expired, 745 (unsigned long)p); 746 setup_timer(&p->query_timer, br_multicast_port_group_query_expired, 747 (unsigned long)p); 748 749 rcu_assign_pointer(*pp, p); 750 751 found: 752 mod_timer(&p->timer, now + br->multicast_membership_interval); 753 out: 754 err = 0; 755 756 err: 757 spin_unlock(&br->multicast_lock); 758 return err; 759 } 760 761 static int br_ip4_multicast_add_group(struct net_bridge *br, 762 struct net_bridge_port *port, 763 __be32 group) 764 { 765 struct br_ip br_group; 766 767 if (ipv4_is_local_multicast(group)) 768 return 0; 769 770 br_group.u.ip4 = group; 771 br_group.proto = htons(ETH_P_IP); 772 773 return br_multicast_add_group(br, port, &br_group); 774 } 775 776 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 777 static int br_ip6_multicast_add_group(struct net_bridge *br, 778 struct net_bridge_port *port, 779 const struct in6_addr *group) 780 { 781 struct br_ip br_group; 782 783 if (ipv6_is_local_multicast(group)) 784 return 0; 785 786 ipv6_addr_copy(&br_group.u.ip6, group); 787 br_group.proto = htons(ETH_P_IP); 788 789 return br_multicast_add_group(br, port, &br_group); 790 } 791 #endif 792 793 static void br_multicast_router_expired(unsigned long data) 794 { 795 struct net_bridge_port *port = (void *)data; 796 struct net_bridge *br = port->br; 797 798 spin_lock(&br->multicast_lock); 799 if (port->multicast_router != 1 || 800 timer_pending(&port->multicast_router_timer) || 801 hlist_unhashed(&port->rlist)) 802 goto out; 803 804 hlist_del_init_rcu(&port->rlist); 805 806 out: 807 spin_unlock(&br->multicast_lock); 808 } 809 810 static void br_multicast_local_router_expired(unsigned long data) 811 { 812 } 813 814 static void __br_multicast_send_query(struct net_bridge *br, 815 struct net_bridge_port *port, 816 struct br_ip *ip) 817 { 818 struct sk_buff *skb; 819 820 skb = br_multicast_alloc_query(br, ip); 821 if (!skb) 822 return; 823 824 if (port) { 825 __skb_push(skb, sizeof(struct ethhdr)); 826 skb->dev = port->dev; 827 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, 828 dev_queue_xmit); 829 } else 830 netif_rx(skb); 831 } 832 833 static void br_multicast_send_query(struct net_bridge *br, 834 struct net_bridge_port *port, u32 sent) 835 { 836 unsigned long time; 837 struct br_ip br_group; 838 839 if (!netif_running(br->dev) || br->multicast_disabled || 840 timer_pending(&br->multicast_querier_timer)) 841 return; 842 843 memset(&br_group.u, 0, sizeof(br_group.u)); 844 845 br_group.proto = htons(ETH_P_IP); 846 __br_multicast_send_query(br, port, &br_group); 847 848 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 849 br_group.proto = htons(ETH_P_IPV6); 850 __br_multicast_send_query(br, port, &br_group); 851 #endif 852 853 time = jiffies; 854 time += sent < br->multicast_startup_query_count ? 855 br->multicast_startup_query_interval : 856 br->multicast_query_interval; 857 mod_timer(port ? &port->multicast_query_timer : 858 &br->multicast_query_timer, time); 859 } 860 861 static void br_multicast_port_query_expired(unsigned long data) 862 { 863 struct net_bridge_port *port = (void *)data; 864 struct net_bridge *br = port->br; 865 866 spin_lock(&br->multicast_lock); 867 if (port->state == BR_STATE_DISABLED || 868 port->state == BR_STATE_BLOCKING) 869 goto out; 870 871 if (port->multicast_startup_queries_sent < 872 br->multicast_startup_query_count) 873 port->multicast_startup_queries_sent++; 874 875 br_multicast_send_query(port->br, port, 876 port->multicast_startup_queries_sent); 877 878 out: 879 spin_unlock(&br->multicast_lock); 880 } 881 882 void br_multicast_add_port(struct net_bridge_port *port) 883 { 884 port->multicast_router = 1; 885 886 setup_timer(&port->multicast_router_timer, br_multicast_router_expired, 887 (unsigned long)port); 888 setup_timer(&port->multicast_query_timer, 889 br_multicast_port_query_expired, (unsigned long)port); 890 } 891 892 void br_multicast_del_port(struct net_bridge_port *port) 893 { 894 del_timer_sync(&port->multicast_router_timer); 895 } 896 897 static void __br_multicast_enable_port(struct net_bridge_port *port) 898 { 899 port->multicast_startup_queries_sent = 0; 900 901 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || 902 del_timer(&port->multicast_query_timer)) 903 mod_timer(&port->multicast_query_timer, jiffies); 904 } 905 906 void br_multicast_enable_port(struct net_bridge_port *port) 907 { 908 struct net_bridge *br = port->br; 909 910 spin_lock(&br->multicast_lock); 911 if (br->multicast_disabled || !netif_running(br->dev)) 912 goto out; 913 914 __br_multicast_enable_port(port); 915 916 out: 917 spin_unlock(&br->multicast_lock); 918 } 919 920 void br_multicast_disable_port(struct net_bridge_port *port) 921 { 922 struct net_bridge *br = port->br; 923 struct net_bridge_port_group *pg; 924 struct hlist_node *p, *n; 925 926 spin_lock(&br->multicast_lock); 927 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist) 928 br_multicast_del_pg(br, pg); 929 930 if (!hlist_unhashed(&port->rlist)) 931 hlist_del_init_rcu(&port->rlist); 932 del_timer(&port->multicast_router_timer); 933 del_timer(&port->multicast_query_timer); 934 spin_unlock(&br->multicast_lock); 935 } 936 937 static int br_ip4_multicast_igmp3_report(struct net_bridge *br, 938 struct net_bridge_port *port, 939 struct sk_buff *skb) 940 { 941 struct igmpv3_report *ih; 942 struct igmpv3_grec *grec; 943 int i; 944 int len; 945 int num; 946 int type; 947 int err = 0; 948 __be32 group; 949 950 if (!pskb_may_pull(skb, sizeof(*ih))) 951 return -EINVAL; 952 953 ih = igmpv3_report_hdr(skb); 954 num = ntohs(ih->ngrec); 955 len = sizeof(*ih); 956 957 for (i = 0; i < num; i++) { 958 len += sizeof(*grec); 959 if (!pskb_may_pull(skb, len)) 960 return -EINVAL; 961 962 grec = (void *)(skb->data + len - sizeof(*grec)); 963 group = grec->grec_mca; 964 type = grec->grec_type; 965 966 len += ntohs(grec->grec_nsrcs) * 4; 967 if (!pskb_may_pull(skb, len)) 968 return -EINVAL; 969 970 /* We treat this as an IGMPv2 report for now. */ 971 switch (type) { 972 case IGMPV3_MODE_IS_INCLUDE: 973 case IGMPV3_MODE_IS_EXCLUDE: 974 case IGMPV3_CHANGE_TO_INCLUDE: 975 case IGMPV3_CHANGE_TO_EXCLUDE: 976 case IGMPV3_ALLOW_NEW_SOURCES: 977 case IGMPV3_BLOCK_OLD_SOURCES: 978 break; 979 980 default: 981 continue; 982 } 983 984 err = br_ip4_multicast_add_group(br, port, group); 985 if (err) 986 break; 987 } 988 989 return err; 990 } 991 992 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 993 static int br_ip6_multicast_mld2_report(struct net_bridge *br, 994 struct net_bridge_port *port, 995 struct sk_buff *skb) 996 { 997 struct icmp6hdr *icmp6h; 998 struct mld2_grec *grec; 999 int i; 1000 int len; 1001 int num; 1002 int err = 0; 1003 1004 if (!pskb_may_pull(skb, sizeof(*icmp6h))) 1005 return -EINVAL; 1006 1007 icmp6h = icmp6_hdr(skb); 1008 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 1009 len = sizeof(*icmp6h); 1010 1011 for (i = 0; i < num; i++) { 1012 __be16 *nsrcs, _nsrcs; 1013 1014 nsrcs = skb_header_pointer(skb, 1015 len + offsetof(struct mld2_grec, 1016 grec_mca), 1017 sizeof(_nsrcs), &_nsrcs); 1018 if (!nsrcs) 1019 return -EINVAL; 1020 1021 if (!pskb_may_pull(skb, 1022 len + sizeof(*grec) + 1023 sizeof(struct in6_addr) * (*nsrcs))) 1024 return -EINVAL; 1025 1026 grec = (struct mld2_grec *)(skb->data + len); 1027 len += sizeof(*grec) + sizeof(struct in6_addr) * (*nsrcs); 1028 1029 /* We treat these as MLDv1 reports for now. */ 1030 switch (grec->grec_type) { 1031 case MLD2_MODE_IS_INCLUDE: 1032 case MLD2_MODE_IS_EXCLUDE: 1033 case MLD2_CHANGE_TO_INCLUDE: 1034 case MLD2_CHANGE_TO_EXCLUDE: 1035 case MLD2_ALLOW_NEW_SOURCES: 1036 case MLD2_BLOCK_OLD_SOURCES: 1037 break; 1038 1039 default: 1040 continue; 1041 } 1042 1043 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca); 1044 if (!err) 1045 break; 1046 } 1047 1048 return err; 1049 } 1050 #endif 1051 1052 /* 1053 * Add port to rotuer_list 1054 * list is maintained ordered by pointer value 1055 * and locked by br->multicast_lock and RCU 1056 */ 1057 static void br_multicast_add_router(struct net_bridge *br, 1058 struct net_bridge_port *port) 1059 { 1060 struct net_bridge_port *p; 1061 struct hlist_node *n, *slot = NULL; 1062 1063 hlist_for_each_entry(p, n, &br->router_list, rlist) { 1064 if ((unsigned long) port >= (unsigned long) p) 1065 break; 1066 slot = n; 1067 } 1068 1069 if (slot) 1070 hlist_add_after_rcu(slot, &port->rlist); 1071 else 1072 hlist_add_head_rcu(&port->rlist, &br->router_list); 1073 } 1074 1075 static void br_multicast_mark_router(struct net_bridge *br, 1076 struct net_bridge_port *port) 1077 { 1078 unsigned long now = jiffies; 1079 1080 if (!port) { 1081 if (br->multicast_router == 1) 1082 mod_timer(&br->multicast_router_timer, 1083 now + br->multicast_querier_interval); 1084 return; 1085 } 1086 1087 if (port->multicast_router != 1) 1088 return; 1089 1090 if (!hlist_unhashed(&port->rlist)) 1091 goto timer; 1092 1093 br_multicast_add_router(br, port); 1094 1095 timer: 1096 mod_timer(&port->multicast_router_timer, 1097 now + br->multicast_querier_interval); 1098 } 1099 1100 static void br_multicast_query_received(struct net_bridge *br, 1101 struct net_bridge_port *port, 1102 int saddr) 1103 { 1104 if (saddr) 1105 mod_timer(&br->multicast_querier_timer, 1106 jiffies + br->multicast_querier_interval); 1107 else if (timer_pending(&br->multicast_querier_timer)) 1108 return; 1109 1110 br_multicast_mark_router(br, port); 1111 } 1112 1113 static int br_ip4_multicast_query(struct net_bridge *br, 1114 struct net_bridge_port *port, 1115 struct sk_buff *skb) 1116 { 1117 struct iphdr *iph = ip_hdr(skb); 1118 struct igmphdr *ih = igmp_hdr(skb); 1119 struct net_bridge_mdb_entry *mp; 1120 struct igmpv3_query *ih3; 1121 struct net_bridge_port_group *p; 1122 struct net_bridge_port_group __rcu **pp; 1123 unsigned long max_delay; 1124 unsigned long now = jiffies; 1125 __be32 group; 1126 int err = 0; 1127 1128 spin_lock(&br->multicast_lock); 1129 if (!netif_running(br->dev) || 1130 (port && port->state == BR_STATE_DISABLED)) 1131 goto out; 1132 1133 br_multicast_query_received(br, port, !!iph->saddr); 1134 1135 group = ih->group; 1136 1137 if (skb->len == sizeof(*ih)) { 1138 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 1139 1140 if (!max_delay) { 1141 max_delay = 10 * HZ; 1142 group = 0; 1143 } 1144 } else { 1145 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) { 1146 err = -EINVAL; 1147 goto out; 1148 } 1149 1150 ih3 = igmpv3_query_hdr(skb); 1151 if (ih3->nsrcs) 1152 goto out; 1153 1154 max_delay = ih3->code ? 1155 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 1156 } 1157 1158 if (!group) 1159 goto out; 1160 1161 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group); 1162 if (!mp) 1163 goto out; 1164 1165 max_delay *= br->multicast_last_member_count; 1166 1167 if (mp->mglist && 1168 (timer_pending(&mp->timer) ? 1169 time_after(mp->timer.expires, now + max_delay) : 1170 try_to_del_timer_sync(&mp->timer) >= 0)) 1171 mod_timer(&mp->timer, now + max_delay); 1172 1173 for (pp = &mp->ports; 1174 (p = mlock_dereference(*pp, br)) != NULL; 1175 pp = &p->next) { 1176 if (timer_pending(&p->timer) ? 1177 time_after(p->timer.expires, now + max_delay) : 1178 try_to_del_timer_sync(&p->timer) >= 0) 1179 mod_timer(&p->timer, now + max_delay); 1180 } 1181 1182 out: 1183 spin_unlock(&br->multicast_lock); 1184 return err; 1185 } 1186 1187 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1188 static int br_ip6_multicast_query(struct net_bridge *br, 1189 struct net_bridge_port *port, 1190 struct sk_buff *skb) 1191 { 1192 struct ipv6hdr *ip6h = ipv6_hdr(skb); 1193 struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb); 1194 struct net_bridge_mdb_entry *mp; 1195 struct mld2_query *mld2q; 1196 struct net_bridge_port_group *p; 1197 struct net_bridge_port_group __rcu **pp; 1198 unsigned long max_delay; 1199 unsigned long now = jiffies; 1200 struct in6_addr *group = NULL; 1201 int err = 0; 1202 1203 spin_lock(&br->multicast_lock); 1204 if (!netif_running(br->dev) || 1205 (port && port->state == BR_STATE_DISABLED)) 1206 goto out; 1207 1208 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr)); 1209 1210 if (skb->len == sizeof(*mld)) { 1211 if (!pskb_may_pull(skb, sizeof(*mld))) { 1212 err = -EINVAL; 1213 goto out; 1214 } 1215 mld = (struct mld_msg *) icmp6_hdr(skb); 1216 max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay)); 1217 if (max_delay) 1218 group = &mld->mld_mca; 1219 } else if (skb->len >= sizeof(*mld2q)) { 1220 if (!pskb_may_pull(skb, sizeof(*mld2q))) { 1221 err = -EINVAL; 1222 goto out; 1223 } 1224 mld2q = (struct mld2_query *)icmp6_hdr(skb); 1225 if (!mld2q->mld2q_nsrcs) 1226 group = &mld2q->mld2q_mca; 1227 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1; 1228 } 1229 1230 if (!group) 1231 goto out; 1232 1233 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group); 1234 if (!mp) 1235 goto out; 1236 1237 max_delay *= br->multicast_last_member_count; 1238 if (mp->mglist && 1239 (timer_pending(&mp->timer) ? 1240 time_after(mp->timer.expires, now + max_delay) : 1241 try_to_del_timer_sync(&mp->timer) >= 0)) 1242 mod_timer(&mp->timer, now + max_delay); 1243 1244 for (pp = &mp->ports; 1245 (p = mlock_dereference(*pp, br)) != NULL; 1246 pp = &p->next) { 1247 if (timer_pending(&p->timer) ? 1248 time_after(p->timer.expires, now + max_delay) : 1249 try_to_del_timer_sync(&p->timer) >= 0) 1250 mod_timer(&p->timer, now + max_delay); 1251 } 1252 1253 out: 1254 spin_unlock(&br->multicast_lock); 1255 return err; 1256 } 1257 #endif 1258 1259 static void br_multicast_leave_group(struct net_bridge *br, 1260 struct net_bridge_port *port, 1261 struct br_ip *group) 1262 { 1263 struct net_bridge_mdb_htable *mdb; 1264 struct net_bridge_mdb_entry *mp; 1265 struct net_bridge_port_group *p; 1266 unsigned long now; 1267 unsigned long time; 1268 1269 spin_lock(&br->multicast_lock); 1270 if (!netif_running(br->dev) || 1271 (port && port->state == BR_STATE_DISABLED) || 1272 timer_pending(&br->multicast_querier_timer)) 1273 goto out; 1274 1275 mdb = mlock_dereference(br->mdb, br); 1276 mp = br_mdb_ip_get(mdb, group); 1277 if (!mp) 1278 goto out; 1279 1280 now = jiffies; 1281 time = now + br->multicast_last_member_count * 1282 br->multicast_last_member_interval; 1283 1284 if (!port) { 1285 if (mp->mglist && 1286 (timer_pending(&mp->timer) ? 1287 time_after(mp->timer.expires, time) : 1288 try_to_del_timer_sync(&mp->timer) >= 0)) { 1289 mod_timer(&mp->timer, time); 1290 1291 mp->queries_sent = 0; 1292 mod_timer(&mp->query_timer, now); 1293 } 1294 1295 goto out; 1296 } 1297 1298 for (p = mlock_dereference(mp->ports, br); 1299 p != NULL; 1300 p = mlock_dereference(p->next, br)) { 1301 if (p->port != port) 1302 continue; 1303 1304 if (!hlist_unhashed(&p->mglist) && 1305 (timer_pending(&p->timer) ? 1306 time_after(p->timer.expires, time) : 1307 try_to_del_timer_sync(&p->timer) >= 0)) { 1308 mod_timer(&p->timer, time); 1309 1310 p->queries_sent = 0; 1311 mod_timer(&p->query_timer, now); 1312 } 1313 1314 break; 1315 } 1316 1317 out: 1318 spin_unlock(&br->multicast_lock); 1319 } 1320 1321 static void br_ip4_multicast_leave_group(struct net_bridge *br, 1322 struct net_bridge_port *port, 1323 __be32 group) 1324 { 1325 struct br_ip br_group; 1326 1327 if (ipv4_is_local_multicast(group)) 1328 return; 1329 1330 br_group.u.ip4 = group; 1331 br_group.proto = htons(ETH_P_IP); 1332 1333 br_multicast_leave_group(br, port, &br_group); 1334 } 1335 1336 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1337 static void br_ip6_multicast_leave_group(struct net_bridge *br, 1338 struct net_bridge_port *port, 1339 const struct in6_addr *group) 1340 { 1341 struct br_ip br_group; 1342 1343 if (ipv6_is_local_multicast(group)) 1344 return; 1345 1346 ipv6_addr_copy(&br_group.u.ip6, group); 1347 br_group.proto = htons(ETH_P_IPV6); 1348 1349 br_multicast_leave_group(br, port, &br_group); 1350 } 1351 #endif 1352 1353 static int br_multicast_ipv4_rcv(struct net_bridge *br, 1354 struct net_bridge_port *port, 1355 struct sk_buff *skb) 1356 { 1357 struct sk_buff *skb2 = skb; 1358 struct iphdr *iph; 1359 struct igmphdr *ih; 1360 unsigned len; 1361 unsigned offset; 1362 int err; 1363 1364 /* We treat OOM as packet loss for now. */ 1365 if (!pskb_may_pull(skb, sizeof(*iph))) 1366 return -EINVAL; 1367 1368 iph = ip_hdr(skb); 1369 1370 if (iph->ihl < 5 || iph->version != 4) 1371 return -EINVAL; 1372 1373 if (!pskb_may_pull(skb, ip_hdrlen(skb))) 1374 return -EINVAL; 1375 1376 iph = ip_hdr(skb); 1377 1378 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1379 return -EINVAL; 1380 1381 if (iph->protocol != IPPROTO_IGMP) 1382 return 0; 1383 1384 len = ntohs(iph->tot_len); 1385 if (skb->len < len || len < ip_hdrlen(skb)) 1386 return -EINVAL; 1387 1388 if (skb->len > len) { 1389 skb2 = skb_clone(skb, GFP_ATOMIC); 1390 if (!skb2) 1391 return -ENOMEM; 1392 1393 err = pskb_trim_rcsum(skb2, len); 1394 if (err) 1395 goto err_out; 1396 } 1397 1398 len -= ip_hdrlen(skb2); 1399 offset = skb_network_offset(skb2) + ip_hdrlen(skb2); 1400 __skb_pull(skb2, offset); 1401 skb_reset_transport_header(skb2); 1402 1403 err = -EINVAL; 1404 if (!pskb_may_pull(skb2, sizeof(*ih))) 1405 goto out; 1406 1407 switch (skb2->ip_summed) { 1408 case CHECKSUM_COMPLETE: 1409 if (!csum_fold(skb2->csum)) 1410 break; 1411 /* fall through */ 1412 case CHECKSUM_NONE: 1413 skb2->csum = 0; 1414 if (skb_checksum_complete(skb2)) 1415 goto out; 1416 } 1417 1418 err = 0; 1419 1420 BR_INPUT_SKB_CB(skb)->igmp = 1; 1421 ih = igmp_hdr(skb2); 1422 1423 switch (ih->type) { 1424 case IGMP_HOST_MEMBERSHIP_REPORT: 1425 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1426 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1; 1427 err = br_ip4_multicast_add_group(br, port, ih->group); 1428 break; 1429 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1430 err = br_ip4_multicast_igmp3_report(br, port, skb2); 1431 break; 1432 case IGMP_HOST_MEMBERSHIP_QUERY: 1433 err = br_ip4_multicast_query(br, port, skb2); 1434 break; 1435 case IGMP_HOST_LEAVE_MESSAGE: 1436 br_ip4_multicast_leave_group(br, port, ih->group); 1437 break; 1438 } 1439 1440 out: 1441 __skb_push(skb2, offset); 1442 err_out: 1443 if (skb2 != skb) 1444 kfree_skb(skb2); 1445 return err; 1446 } 1447 1448 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1449 static int br_multicast_ipv6_rcv(struct net_bridge *br, 1450 struct net_bridge_port *port, 1451 struct sk_buff *skb) 1452 { 1453 struct sk_buff *skb2; 1454 struct ipv6hdr *ip6h; 1455 struct icmp6hdr *icmp6h; 1456 u8 nexthdr; 1457 unsigned len; 1458 int offset; 1459 int err; 1460 1461 if (!pskb_may_pull(skb, sizeof(*ip6h))) 1462 return -EINVAL; 1463 1464 ip6h = ipv6_hdr(skb); 1465 1466 /* 1467 * We're interested in MLD messages only. 1468 * - Version is 6 1469 * - MLD has always Router Alert hop-by-hop option 1470 * - But we do not support jumbrograms. 1471 */ 1472 if (ip6h->version != 6 || 1473 ip6h->nexthdr != IPPROTO_HOPOPTS || 1474 ip6h->payload_len == 0) 1475 return 0; 1476 1477 len = ntohs(ip6h->payload_len); 1478 if (skb->len < len) 1479 return -EINVAL; 1480 1481 nexthdr = ip6h->nexthdr; 1482 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr); 1483 1484 if (offset < 0 || nexthdr != IPPROTO_ICMPV6) 1485 return 0; 1486 1487 /* Okay, we found ICMPv6 header */ 1488 skb2 = skb_clone(skb, GFP_ATOMIC); 1489 if (!skb2) 1490 return -ENOMEM; 1491 1492 err = -EINVAL; 1493 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr))) 1494 goto out; 1495 1496 len -= offset - skb_network_offset(skb2); 1497 1498 __skb_pull(skb2, offset); 1499 skb_reset_transport_header(skb2); 1500 1501 icmp6h = icmp6_hdr(skb2); 1502 1503 switch (icmp6h->icmp6_type) { 1504 case ICMPV6_MGM_QUERY: 1505 case ICMPV6_MGM_REPORT: 1506 case ICMPV6_MGM_REDUCTION: 1507 case ICMPV6_MLD2_REPORT: 1508 break; 1509 default: 1510 err = 0; 1511 goto out; 1512 } 1513 1514 /* Okay, we found MLD message. Check further. */ 1515 if (skb2->len > len) { 1516 err = pskb_trim_rcsum(skb2, len); 1517 if (err) 1518 goto out; 1519 } 1520 1521 switch (skb2->ip_summed) { 1522 case CHECKSUM_COMPLETE: 1523 if (!csum_fold(skb2->csum)) 1524 break; 1525 /*FALLTHROUGH*/ 1526 case CHECKSUM_NONE: 1527 skb2->csum = 0; 1528 if (skb_checksum_complete(skb2)) 1529 goto out; 1530 } 1531 1532 err = 0; 1533 1534 BR_INPUT_SKB_CB(skb)->igmp = 1; 1535 1536 switch (icmp6h->icmp6_type) { 1537 case ICMPV6_MGM_REPORT: 1538 { 1539 struct mld_msg *mld; 1540 if (!pskb_may_pull(skb2, sizeof(*mld))) { 1541 err = -EINVAL; 1542 goto out; 1543 } 1544 mld = (struct mld_msg *)skb_transport_header(skb2); 1545 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1; 1546 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca); 1547 break; 1548 } 1549 case ICMPV6_MLD2_REPORT: 1550 err = br_ip6_multicast_mld2_report(br, port, skb2); 1551 break; 1552 case ICMPV6_MGM_QUERY: 1553 err = br_ip6_multicast_query(br, port, skb2); 1554 break; 1555 case ICMPV6_MGM_REDUCTION: 1556 { 1557 struct mld_msg *mld; 1558 if (!pskb_may_pull(skb2, sizeof(*mld))) { 1559 err = -EINVAL; 1560 goto out; 1561 } 1562 mld = (struct mld_msg *)skb_transport_header(skb2); 1563 br_ip6_multicast_leave_group(br, port, &mld->mld_mca); 1564 } 1565 } 1566 1567 out: 1568 kfree_skb(skb2); 1569 return err; 1570 } 1571 #endif 1572 1573 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 1574 struct sk_buff *skb) 1575 { 1576 BR_INPUT_SKB_CB(skb)->igmp = 0; 1577 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 1578 1579 if (br->multicast_disabled) 1580 return 0; 1581 1582 switch (skb->protocol) { 1583 case htons(ETH_P_IP): 1584 return br_multicast_ipv4_rcv(br, port, skb); 1585 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1586 case htons(ETH_P_IPV6): 1587 return br_multicast_ipv6_rcv(br, port, skb); 1588 #endif 1589 } 1590 1591 return 0; 1592 } 1593 1594 static void br_multicast_query_expired(unsigned long data) 1595 { 1596 struct net_bridge *br = (void *)data; 1597 1598 spin_lock(&br->multicast_lock); 1599 if (br->multicast_startup_queries_sent < 1600 br->multicast_startup_query_count) 1601 br->multicast_startup_queries_sent++; 1602 1603 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent); 1604 1605 spin_unlock(&br->multicast_lock); 1606 } 1607 1608 void br_multicast_init(struct net_bridge *br) 1609 { 1610 br->hash_elasticity = 4; 1611 br->hash_max = 512; 1612 1613 br->multicast_router = 1; 1614 br->multicast_last_member_count = 2; 1615 br->multicast_startup_query_count = 2; 1616 1617 br->multicast_last_member_interval = HZ; 1618 br->multicast_query_response_interval = 10 * HZ; 1619 br->multicast_startup_query_interval = 125 * HZ / 4; 1620 br->multicast_query_interval = 125 * HZ; 1621 br->multicast_querier_interval = 255 * HZ; 1622 br->multicast_membership_interval = 260 * HZ; 1623 1624 spin_lock_init(&br->multicast_lock); 1625 setup_timer(&br->multicast_router_timer, 1626 br_multicast_local_router_expired, 0); 1627 setup_timer(&br->multicast_querier_timer, 1628 br_multicast_local_router_expired, 0); 1629 setup_timer(&br->multicast_query_timer, br_multicast_query_expired, 1630 (unsigned long)br); 1631 } 1632 1633 void br_multicast_open(struct net_bridge *br) 1634 { 1635 br->multicast_startup_queries_sent = 0; 1636 1637 if (br->multicast_disabled) 1638 return; 1639 1640 mod_timer(&br->multicast_query_timer, jiffies); 1641 } 1642 1643 void br_multicast_stop(struct net_bridge *br) 1644 { 1645 struct net_bridge_mdb_htable *mdb; 1646 struct net_bridge_mdb_entry *mp; 1647 struct hlist_node *p, *n; 1648 u32 ver; 1649 int i; 1650 1651 del_timer_sync(&br->multicast_router_timer); 1652 del_timer_sync(&br->multicast_querier_timer); 1653 del_timer_sync(&br->multicast_query_timer); 1654 1655 spin_lock_bh(&br->multicast_lock); 1656 mdb = mlock_dereference(br->mdb, br); 1657 if (!mdb) 1658 goto out; 1659 1660 br->mdb = NULL; 1661 1662 ver = mdb->ver; 1663 for (i = 0; i < mdb->max; i++) { 1664 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i], 1665 hlist[ver]) { 1666 del_timer(&mp->timer); 1667 del_timer(&mp->query_timer); 1668 call_rcu_bh(&mp->rcu, br_multicast_free_group); 1669 } 1670 } 1671 1672 if (mdb->old) { 1673 spin_unlock_bh(&br->multicast_lock); 1674 rcu_barrier_bh(); 1675 spin_lock_bh(&br->multicast_lock); 1676 WARN_ON(mdb->old); 1677 } 1678 1679 mdb->old = mdb; 1680 call_rcu_bh(&mdb->rcu, br_mdb_free); 1681 1682 out: 1683 spin_unlock_bh(&br->multicast_lock); 1684 } 1685 1686 int br_multicast_set_router(struct net_bridge *br, unsigned long val) 1687 { 1688 int err = -ENOENT; 1689 1690 spin_lock_bh(&br->multicast_lock); 1691 if (!netif_running(br->dev)) 1692 goto unlock; 1693 1694 switch (val) { 1695 case 0: 1696 case 2: 1697 del_timer(&br->multicast_router_timer); 1698 /* fall through */ 1699 case 1: 1700 br->multicast_router = val; 1701 err = 0; 1702 break; 1703 1704 default: 1705 err = -EINVAL; 1706 break; 1707 } 1708 1709 unlock: 1710 spin_unlock_bh(&br->multicast_lock); 1711 1712 return err; 1713 } 1714 1715 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) 1716 { 1717 struct net_bridge *br = p->br; 1718 int err = -ENOENT; 1719 1720 spin_lock(&br->multicast_lock); 1721 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) 1722 goto unlock; 1723 1724 switch (val) { 1725 case 0: 1726 case 1: 1727 case 2: 1728 p->multicast_router = val; 1729 err = 0; 1730 1731 if (val < 2 && !hlist_unhashed(&p->rlist)) 1732 hlist_del_init_rcu(&p->rlist); 1733 1734 if (val == 1) 1735 break; 1736 1737 del_timer(&p->multicast_router_timer); 1738 1739 if (val == 0) 1740 break; 1741 1742 br_multicast_add_router(br, p); 1743 break; 1744 1745 default: 1746 err = -EINVAL; 1747 break; 1748 } 1749 1750 unlock: 1751 spin_unlock(&br->multicast_lock); 1752 1753 return err; 1754 } 1755 1756 int br_multicast_toggle(struct net_bridge *br, unsigned long val) 1757 { 1758 struct net_bridge_port *port; 1759 int err = 0; 1760 struct net_bridge_mdb_htable *mdb; 1761 1762 spin_lock(&br->multicast_lock); 1763 if (br->multicast_disabled == !val) 1764 goto unlock; 1765 1766 br->multicast_disabled = !val; 1767 if (br->multicast_disabled) 1768 goto unlock; 1769 1770 if (!netif_running(br->dev)) 1771 goto unlock; 1772 1773 mdb = mlock_dereference(br->mdb, br); 1774 if (mdb) { 1775 if (mdb->old) { 1776 err = -EEXIST; 1777 rollback: 1778 br->multicast_disabled = !!val; 1779 goto unlock; 1780 } 1781 1782 err = br_mdb_rehash(&br->mdb, mdb->max, 1783 br->hash_elasticity); 1784 if (err) 1785 goto rollback; 1786 } 1787 1788 br_multicast_open(br); 1789 list_for_each_entry(port, &br->port_list, list) { 1790 if (port->state == BR_STATE_DISABLED || 1791 port->state == BR_STATE_BLOCKING) 1792 continue; 1793 1794 __br_multicast_enable_port(port); 1795 } 1796 1797 unlock: 1798 spin_unlock(&br->multicast_lock); 1799 1800 return err; 1801 } 1802 1803 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) 1804 { 1805 int err = -ENOENT; 1806 u32 old; 1807 struct net_bridge_mdb_htable *mdb; 1808 1809 spin_lock(&br->multicast_lock); 1810 if (!netif_running(br->dev)) 1811 goto unlock; 1812 1813 err = -EINVAL; 1814 if (!is_power_of_2(val)) 1815 goto unlock; 1816 1817 mdb = mlock_dereference(br->mdb, br); 1818 if (mdb && val < mdb->size) 1819 goto unlock; 1820 1821 err = 0; 1822 1823 old = br->hash_max; 1824 br->hash_max = val; 1825 1826 if (mdb) { 1827 if (mdb->old) { 1828 err = -EEXIST; 1829 rollback: 1830 br->hash_max = old; 1831 goto unlock; 1832 } 1833 1834 err = br_mdb_rehash(&br->mdb, br->hash_max, 1835 br->hash_elasticity); 1836 if (err) 1837 goto rollback; 1838 } 1839 1840 unlock: 1841 spin_unlock(&br->multicast_lock); 1842 1843 return err; 1844 } 1845