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