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 *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 printk(KERN_INFO "%s: Multicast hash table " 589 "chain limit reached: %s\n", 590 br->dev->name, port ? port->dev->name : 591 br->dev->name); 592 593 elasticity = br->hash_elasticity; 594 } 595 596 if (mdb->size >= max) { 597 max *= 2; 598 if (unlikely(max >= br->hash_max)) { 599 printk(KERN_WARNING "%s: Multicast hash table maximum " 600 "reached, disabling snooping: %s, %d\n", 601 br->dev->name, port ? port->dev->name : 602 br->dev->name, 603 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 printk(KERN_INFO "%s: Multicast hash table " 615 "on fire: %s\n", 616 br->dev->name, port ? port->dev->name : 617 br->dev->name); 618 err = -EEXIST; 619 goto err; 620 } 621 622 err = br_mdb_rehash(&br->mdb, max, elasticity); 623 if (err) { 624 printk(KERN_WARNING "%s: Cannot rehash multicast " 625 "hash table, disabling snooping: " 626 "%s, %d, %d\n", 627 br->dev->name, port ? port->dev->name : 628 br->dev->name, 629 mdb->size, err); 630 goto disable; 631 } 632 633 err = -EAGAIN; 634 goto err; 635 } 636 637 return NULL; 638 639 err: 640 mp = ERR_PTR(err); 641 return mp; 642 } 643 644 static struct net_bridge_mdb_entry *br_multicast_new_group( 645 struct net_bridge *br, struct net_bridge_port *port, 646 struct br_ip *group) 647 { 648 struct net_bridge_mdb_htable *mdb = br->mdb; 649 struct net_bridge_mdb_entry *mp; 650 int hash; 651 652 if (!mdb) { 653 if (br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0)) 654 return NULL; 655 goto rehash; 656 } 657 658 hash = br_ip_hash(mdb, group); 659 mp = br_multicast_get_group(br, port, group, hash); 660 switch (PTR_ERR(mp)) { 661 case 0: 662 break; 663 664 case -EAGAIN: 665 rehash: 666 mdb = br->mdb; 667 hash = br_ip_hash(mdb, group); 668 break; 669 670 default: 671 goto out; 672 } 673 674 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 675 if (unlikely(!mp)) 676 goto out; 677 678 mp->br = br; 679 mp->addr = *group; 680 setup_timer(&mp->timer, br_multicast_group_expired, 681 (unsigned long)mp); 682 setup_timer(&mp->query_timer, br_multicast_group_query_expired, 683 (unsigned long)mp); 684 685 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); 686 mdb->size++; 687 688 out: 689 return mp; 690 } 691 692 static int br_multicast_add_group(struct net_bridge *br, 693 struct net_bridge_port *port, 694 struct br_ip *group) 695 { 696 struct net_bridge_mdb_entry *mp; 697 struct net_bridge_port_group *p; 698 struct net_bridge_port_group **pp; 699 unsigned long now = jiffies; 700 int err; 701 702 spin_lock(&br->multicast_lock); 703 if (!netif_running(br->dev) || 704 (port && port->state == BR_STATE_DISABLED)) 705 goto out; 706 707 mp = br_multicast_new_group(br, port, group); 708 err = PTR_ERR(mp); 709 if (unlikely(IS_ERR(mp) || !mp)) 710 goto err; 711 712 if (!port) { 713 hlist_add_head(&mp->mglist, &br->mglist); 714 mod_timer(&mp->timer, now + br->multicast_membership_interval); 715 goto out; 716 } 717 718 for (pp = &mp->ports; (p = *pp); pp = &p->next) { 719 if (p->port == port) 720 goto found; 721 if ((unsigned long)p->port < (unsigned long)port) 722 break; 723 } 724 725 p = kzalloc(sizeof(*p), GFP_ATOMIC); 726 err = -ENOMEM; 727 if (unlikely(!p)) 728 goto err; 729 730 p->addr = *group; 731 p->port = port; 732 p->next = *pp; 733 hlist_add_head(&p->mglist, &port->mglist); 734 setup_timer(&p->timer, br_multicast_port_group_expired, 735 (unsigned long)p); 736 setup_timer(&p->query_timer, br_multicast_port_group_query_expired, 737 (unsigned long)p); 738 739 rcu_assign_pointer(*pp, p); 740 741 found: 742 mod_timer(&p->timer, now + br->multicast_membership_interval); 743 out: 744 err = 0; 745 746 err: 747 spin_unlock(&br->multicast_lock); 748 return err; 749 } 750 751 static int br_ip4_multicast_add_group(struct net_bridge *br, 752 struct net_bridge_port *port, 753 __be32 group) 754 { 755 struct br_ip br_group; 756 757 if (ipv4_is_local_multicast(group)) 758 return 0; 759 760 br_group.u.ip4 = group; 761 br_group.proto = htons(ETH_P_IP); 762 763 return br_multicast_add_group(br, port, &br_group); 764 } 765 766 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 767 static int br_ip6_multicast_add_group(struct net_bridge *br, 768 struct net_bridge_port *port, 769 const struct in6_addr *group) 770 { 771 struct br_ip br_group; 772 773 if (ipv6_is_local_multicast(group)) 774 return 0; 775 776 ipv6_addr_copy(&br_group.u.ip6, group); 777 br_group.proto = htons(ETH_P_IP); 778 779 return br_multicast_add_group(br, port, &br_group); 780 } 781 #endif 782 783 static void br_multicast_router_expired(unsigned long data) 784 { 785 struct net_bridge_port *port = (void *)data; 786 struct net_bridge *br = port->br; 787 788 spin_lock(&br->multicast_lock); 789 if (port->multicast_router != 1 || 790 timer_pending(&port->multicast_router_timer) || 791 hlist_unhashed(&port->rlist)) 792 goto out; 793 794 hlist_del_init_rcu(&port->rlist); 795 796 out: 797 spin_unlock(&br->multicast_lock); 798 } 799 800 static void br_multicast_local_router_expired(unsigned long data) 801 { 802 } 803 804 static void __br_multicast_send_query(struct net_bridge *br, 805 struct net_bridge_port *port, 806 struct br_ip *ip) 807 { 808 struct sk_buff *skb; 809 810 skb = br_multicast_alloc_query(br, ip); 811 if (!skb) 812 return; 813 814 if (port) { 815 __skb_push(skb, sizeof(struct ethhdr)); 816 skb->dev = port->dev; 817 NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, 818 dev_queue_xmit); 819 } else 820 netif_rx(skb); 821 } 822 823 static void br_multicast_send_query(struct net_bridge *br, 824 struct net_bridge_port *port, u32 sent) 825 { 826 unsigned long time; 827 struct br_ip br_group; 828 829 if (!netif_running(br->dev) || br->multicast_disabled || 830 timer_pending(&br->multicast_querier_timer)) 831 return; 832 833 memset(&br_group.u, 0, sizeof(br_group.u)); 834 835 br_group.proto = htons(ETH_P_IP); 836 __br_multicast_send_query(br, port, &br_group); 837 838 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 839 br_group.proto = htons(ETH_P_IPV6); 840 __br_multicast_send_query(br, port, &br_group); 841 #endif 842 843 time = jiffies; 844 time += sent < br->multicast_startup_query_count ? 845 br->multicast_startup_query_interval : 846 br->multicast_query_interval; 847 mod_timer(port ? &port->multicast_query_timer : 848 &br->multicast_query_timer, time); 849 } 850 851 static void br_multicast_port_query_expired(unsigned long data) 852 { 853 struct net_bridge_port *port = (void *)data; 854 struct net_bridge *br = port->br; 855 856 spin_lock(&br->multicast_lock); 857 if (port->state == BR_STATE_DISABLED || 858 port->state == BR_STATE_BLOCKING) 859 goto out; 860 861 if (port->multicast_startup_queries_sent < 862 br->multicast_startup_query_count) 863 port->multicast_startup_queries_sent++; 864 865 br_multicast_send_query(port->br, port, 866 port->multicast_startup_queries_sent); 867 868 out: 869 spin_unlock(&br->multicast_lock); 870 } 871 872 void br_multicast_add_port(struct net_bridge_port *port) 873 { 874 port->multicast_router = 1; 875 876 setup_timer(&port->multicast_router_timer, br_multicast_router_expired, 877 (unsigned long)port); 878 setup_timer(&port->multicast_query_timer, 879 br_multicast_port_query_expired, (unsigned long)port); 880 } 881 882 void br_multicast_del_port(struct net_bridge_port *port) 883 { 884 del_timer_sync(&port->multicast_router_timer); 885 } 886 887 static void __br_multicast_enable_port(struct net_bridge_port *port) 888 { 889 port->multicast_startup_queries_sent = 0; 890 891 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || 892 del_timer(&port->multicast_query_timer)) 893 mod_timer(&port->multicast_query_timer, jiffies); 894 } 895 896 void br_multicast_enable_port(struct net_bridge_port *port) 897 { 898 struct net_bridge *br = port->br; 899 900 spin_lock(&br->multicast_lock); 901 if (br->multicast_disabled || !netif_running(br->dev)) 902 goto out; 903 904 __br_multicast_enable_port(port); 905 906 out: 907 spin_unlock(&br->multicast_lock); 908 } 909 910 void br_multicast_disable_port(struct net_bridge_port *port) 911 { 912 struct net_bridge *br = port->br; 913 struct net_bridge_port_group *pg; 914 struct hlist_node *p, *n; 915 916 spin_lock(&br->multicast_lock); 917 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist) 918 br_multicast_del_pg(br, pg); 919 920 if (!hlist_unhashed(&port->rlist)) 921 hlist_del_init_rcu(&port->rlist); 922 del_timer(&port->multicast_router_timer); 923 del_timer(&port->multicast_query_timer); 924 spin_unlock(&br->multicast_lock); 925 } 926 927 static int br_ip4_multicast_igmp3_report(struct net_bridge *br, 928 struct net_bridge_port *port, 929 struct sk_buff *skb) 930 { 931 struct igmpv3_report *ih; 932 struct igmpv3_grec *grec; 933 int i; 934 int len; 935 int num; 936 int type; 937 int err = 0; 938 __be32 group; 939 940 if (!pskb_may_pull(skb, sizeof(*ih))) 941 return -EINVAL; 942 943 ih = igmpv3_report_hdr(skb); 944 num = ntohs(ih->ngrec); 945 len = sizeof(*ih); 946 947 for (i = 0; i < num; i++) { 948 len += sizeof(*grec); 949 if (!pskb_may_pull(skb, len)) 950 return -EINVAL; 951 952 grec = (void *)(skb->data + len - sizeof(*grec)); 953 group = grec->grec_mca; 954 type = grec->grec_type; 955 956 len += ntohs(grec->grec_nsrcs) * 4; 957 if (!pskb_may_pull(skb, len)) 958 return -EINVAL; 959 960 /* We treat this as an IGMPv2 report for now. */ 961 switch (type) { 962 case IGMPV3_MODE_IS_INCLUDE: 963 case IGMPV3_MODE_IS_EXCLUDE: 964 case IGMPV3_CHANGE_TO_INCLUDE: 965 case IGMPV3_CHANGE_TO_EXCLUDE: 966 case IGMPV3_ALLOW_NEW_SOURCES: 967 case IGMPV3_BLOCK_OLD_SOURCES: 968 break; 969 970 default: 971 continue; 972 } 973 974 err = br_ip4_multicast_add_group(br, port, group); 975 if (err) 976 break; 977 } 978 979 return err; 980 } 981 982 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 983 static int br_ip6_multicast_mld2_report(struct net_bridge *br, 984 struct net_bridge_port *port, 985 struct sk_buff *skb) 986 { 987 struct icmp6hdr *icmp6h; 988 struct mld2_grec *grec; 989 int i; 990 int len; 991 int num; 992 int err = 0; 993 994 if (!pskb_may_pull(skb, sizeof(*icmp6h))) 995 return -EINVAL; 996 997 icmp6h = icmp6_hdr(skb); 998 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 999 len = sizeof(*icmp6h); 1000 1001 for (i = 0; i < num; i++) { 1002 __be16 *nsrcs, _nsrcs; 1003 1004 nsrcs = skb_header_pointer(skb, 1005 len + offsetof(struct mld2_grec, 1006 grec_mca), 1007 sizeof(_nsrcs), &_nsrcs); 1008 if (!nsrcs) 1009 return -EINVAL; 1010 1011 if (!pskb_may_pull(skb, 1012 len + sizeof(*grec) + 1013 sizeof(struct in6_addr) * (*nsrcs))) 1014 return -EINVAL; 1015 1016 grec = (struct mld2_grec *)(skb->data + len); 1017 len += sizeof(*grec) + sizeof(struct in6_addr) * (*nsrcs); 1018 1019 /* We treat these as MLDv1 reports for now. */ 1020 switch (grec->grec_type) { 1021 case MLD2_MODE_IS_INCLUDE: 1022 case MLD2_MODE_IS_EXCLUDE: 1023 case MLD2_CHANGE_TO_INCLUDE: 1024 case MLD2_CHANGE_TO_EXCLUDE: 1025 case MLD2_ALLOW_NEW_SOURCES: 1026 case MLD2_BLOCK_OLD_SOURCES: 1027 break; 1028 1029 default: 1030 continue; 1031 } 1032 1033 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca); 1034 if (!err) 1035 break; 1036 } 1037 1038 return err; 1039 } 1040 #endif 1041 1042 static void br_multicast_add_router(struct net_bridge *br, 1043 struct net_bridge_port *port) 1044 { 1045 struct hlist_node *p; 1046 struct hlist_node **h; 1047 1048 for (h = &br->router_list.first; 1049 (p = *h) && 1050 (unsigned long)container_of(p, struct net_bridge_port, rlist) > 1051 (unsigned long)port; 1052 h = &p->next) 1053 ; 1054 1055 port->rlist.pprev = h; 1056 port->rlist.next = p; 1057 rcu_assign_pointer(*h, &port->rlist); 1058 if (p) 1059 p->pprev = &port->rlist.next; 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 unsigned 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 = -ENOENT; 1732 1733 spin_lock(&br->multicast_lock); 1734 if (!netif_running(br->dev)) 1735 goto unlock; 1736 1737 err = 0; 1738 if (br->multicast_disabled == !val) 1739 goto unlock; 1740 1741 br->multicast_disabled = !val; 1742 if (br->multicast_disabled) 1743 goto unlock; 1744 1745 if (br->mdb) { 1746 if (br->mdb->old) { 1747 err = -EEXIST; 1748 rollback: 1749 br->multicast_disabled = !!val; 1750 goto unlock; 1751 } 1752 1753 err = br_mdb_rehash(&br->mdb, br->mdb->max, 1754 br->hash_elasticity); 1755 if (err) 1756 goto rollback; 1757 } 1758 1759 br_multicast_open(br); 1760 list_for_each_entry(port, &br->port_list, list) { 1761 if (port->state == BR_STATE_DISABLED || 1762 port->state == BR_STATE_BLOCKING) 1763 continue; 1764 1765 __br_multicast_enable_port(port); 1766 } 1767 1768 unlock: 1769 spin_unlock(&br->multicast_lock); 1770 1771 return err; 1772 } 1773 1774 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) 1775 { 1776 int err = -ENOENT; 1777 u32 old; 1778 1779 spin_lock(&br->multicast_lock); 1780 if (!netif_running(br->dev)) 1781 goto unlock; 1782 1783 err = -EINVAL; 1784 if (!is_power_of_2(val)) 1785 goto unlock; 1786 if (br->mdb && val < br->mdb->size) 1787 goto unlock; 1788 1789 err = 0; 1790 1791 old = br->hash_max; 1792 br->hash_max = val; 1793 1794 if (br->mdb) { 1795 if (br->mdb->old) { 1796 err = -EEXIST; 1797 rollback: 1798 br->hash_max = old; 1799 goto unlock; 1800 } 1801 1802 err = br_mdb_rehash(&br->mdb, br->hash_max, 1803 br->hash_elasticity); 1804 if (err) 1805 goto rollback; 1806 } 1807 1808 unlock: 1809 spin_unlock(&br->multicast_lock); 1810 1811 return err; 1812 } 1813