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