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