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) 37static 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 46static 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 61static 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) 67static 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 74static 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 88static 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 102static 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 111static 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) 123static 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 135struct 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 165static 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 176static 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 206static 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 214static 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 222static 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 mp->mglist = false; 233 234 if (mp->ports) 235 goto out; 236 237 mdb = br->mdb; 238 hlist_del_rcu(&mp->hlist[mdb->ver]); 239 mdb->size--; 240 241 del_timer(&mp->query_timer); 242 call_rcu_bh(&mp->rcu, br_multicast_free_group); 243 244out: 245 spin_unlock(&br->multicast_lock); 246} 247 248static void br_multicast_del_pg(struct net_bridge *br, 249 struct net_bridge_port_group *pg) 250{ 251 struct net_bridge_mdb_htable *mdb = br->mdb; 252 struct net_bridge_mdb_entry *mp; 253 struct net_bridge_port_group *p; 254 struct net_bridge_port_group **pp; 255 256 mp = br_mdb_ip_get(mdb, &pg->addr); 257 if (WARN_ON(!mp)) 258 return; 259 260 for (pp = &mp->ports; (p = *pp); pp = &p->next) { 261 if (p != pg) 262 continue; 263 264 rcu_assign_pointer(*pp, p->next); 265 hlist_del_init(&p->mglist); 266 del_timer(&p->timer); 267 del_timer(&p->query_timer); 268 call_rcu_bh(&p->rcu, br_multicast_free_pg); 269 270 if (!mp->ports && !mp->mglist && 271 netif_running(br->dev)) 272 mod_timer(&mp->timer, jiffies); 273 274 return; 275 } 276 277 WARN_ON(1); 278} 279 280static void br_multicast_port_group_expired(unsigned long data) 281{ 282 struct net_bridge_port_group *pg = (void *)data; 283 struct net_bridge *br = pg->port->br; 284 285 spin_lock(&br->multicast_lock); 286 if (!netif_running(br->dev) || timer_pending(&pg->timer) || 287 hlist_unhashed(&pg->mglist)) 288 goto out; 289 290 br_multicast_del_pg(br, pg); 291 292out: 293 spin_unlock(&br->multicast_lock); 294} 295 296static int br_mdb_rehash(struct net_bridge_mdb_htable **mdbp, int max, 297 int elasticity) 298{ 299 struct net_bridge_mdb_htable *old = *mdbp; 300 struct net_bridge_mdb_htable *mdb; 301 int err; 302 303 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); 304 if (!mdb) 305 return -ENOMEM; 306 307 mdb->max = max; 308 mdb->old = old; 309 310 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); 311 if (!mdb->mhash) { 312 kfree(mdb); 313 return -ENOMEM; 314 } 315 316 mdb->size = old ? old->size : 0; 317 mdb->ver = old ? old->ver ^ 1 : 0; 318 319 if (!old || elasticity) 320 get_random_bytes(&mdb->secret, sizeof(mdb->secret)); 321 else 322 mdb->secret = old->secret; 323 324 if (!old) 325 goto out; 326 327 err = br_mdb_copy(mdb, old, elasticity); 328 if (err) { 329 kfree(mdb->mhash); 330 kfree(mdb); 331 return err; 332 } 333 334 call_rcu_bh(&mdb->rcu, br_mdb_free); 335 336out: 337 rcu_assign_pointer(*mdbp, mdb); 338 339 return 0; 340} 341 342static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, 343 __be32 group) 344{ 345 struct sk_buff *skb; 346 struct igmphdr *ih; 347 struct ethhdr *eth; 348 struct iphdr *iph; 349 350 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + 351 sizeof(*ih) + 4); 352 if (!skb) 353 goto out; 354 355 skb->protocol = htons(ETH_P_IP); 356 357 skb_reset_mac_header(skb); 358 eth = eth_hdr(skb); 359 360 memcpy(eth->h_source, br->dev->dev_addr, 6); 361 eth->h_dest[0] = 1; 362 eth->h_dest[1] = 0; 363 eth->h_dest[2] = 0x5e; 364 eth->h_dest[3] = 0; 365 eth->h_dest[4] = 0; 366 eth->h_dest[5] = 1; 367 eth->h_proto = htons(ETH_P_IP); 368 skb_put(skb, sizeof(*eth)); 369 370 skb_set_network_header(skb, skb->len); 371 iph = ip_hdr(skb); 372 373 iph->version = 4; 374 iph->ihl = 6; 375 iph->tos = 0xc0; 376 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); 377 iph->id = 0; 378 iph->frag_off = htons(IP_DF); 379 iph->ttl = 1; 380 iph->protocol = IPPROTO_IGMP; 381 iph->saddr = 0; 382 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); 383 ((u8 *)&iph[1])[0] = IPOPT_RA; 384 ((u8 *)&iph[1])[1] = 4; 385 ((u8 *)&iph[1])[2] = 0; 386 ((u8 *)&iph[1])[3] = 0; 387 ip_send_check(iph); 388 skb_put(skb, 24); 389 390 skb_set_transport_header(skb, skb->len); 391 ih = igmp_hdr(skb); 392 ih->type = IGMP_HOST_MEMBERSHIP_QUERY; 393 ih->code = (group ? br->multicast_last_member_interval : 394 br->multicast_query_response_interval) / 395 (HZ / IGMP_TIMER_SCALE); 396 ih->group = group; 397 ih->csum = 0; 398 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 399 skb_put(skb, sizeof(*ih)); 400 401 __skb_pull(skb, sizeof(*eth)); 402 403out: 404 return skb; 405} 406 407#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 408static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, 409 struct in6_addr *group) 410{ 411 struct sk_buff *skb; 412 struct ipv6hdr *ip6h; 413 struct mld_msg *mldq; 414 struct ethhdr *eth; 415 u8 *hopopt; 416 unsigned long interval; 417 418 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + 419 8 + sizeof(*mldq)); 420 if (!skb) 421 goto out; 422 423 skb->protocol = htons(ETH_P_IPV6); 424 425 /* Ethernet header */ 426 skb_reset_mac_header(skb); 427 eth = eth_hdr(skb); 428 429 memcpy(eth->h_source, br->dev->dev_addr, 6); 430 ipv6_eth_mc_map(group, eth->h_dest); 431 eth->h_proto = htons(ETH_P_IPV6); 432 skb_put(skb, sizeof(*eth)); 433 434 /* IPv6 header + HbH option */ 435 skb_set_network_header(skb, skb->len); 436 ip6h = ipv6_hdr(skb); 437 438 *(__force __be32 *)ip6h = htonl(0x60000000); 439 ip6h->payload_len = htons(8 + sizeof(*mldq)); 440 ip6h->nexthdr = IPPROTO_HOPOPTS; 441 ip6h->hop_limit = 1; 442 ipv6_addr_set(&ip6h->saddr, 0, 0, 0, 0); 443 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); 444 445 hopopt = (u8 *)(ip6h + 1); 446 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ 447 hopopt[1] = 0; /* length of HbH */ 448 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ 449 hopopt[3] = 2; /* Length of RA Option */ 450 hopopt[4] = 0; /* Type = 0x0000 (MLD) */ 451 hopopt[5] = 0; 452 hopopt[6] = IPV6_TLV_PAD0; /* Pad0 */ 453 hopopt[7] = IPV6_TLV_PAD0; /* Pad0 */ 454 455 skb_put(skb, sizeof(*ip6h) + 8); 456 457 /* ICMPv6 */ 458 skb_set_transport_header(skb, skb->len); 459 mldq = (struct mld_msg *) icmp6_hdr(skb); 460 461 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval : 462 br->multicast_query_response_interval; 463 464 mldq->mld_type = ICMPV6_MGM_QUERY; 465 mldq->mld_code = 0; 466 mldq->mld_cksum = 0; 467 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); 468 mldq->mld_reserved = 0; 469 ipv6_addr_copy(&mldq->mld_mca, group); 470 471 /* checksum */ 472 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 473 sizeof(*mldq), IPPROTO_ICMPV6, 474 csum_partial(mldq, 475 sizeof(*mldq), 0)); 476 skb_put(skb, sizeof(*mldq)); 477 478 __skb_pull(skb, sizeof(*eth)); 479 480out: 481 return skb; 482} 483#endif 484 485static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, 486 struct br_ip *addr) 487{ 488 switch (addr->proto) { 489 case htons(ETH_P_IP): 490 return br_ip4_multicast_alloc_query(br, addr->u.ip4); 491#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 492 case htons(ETH_P_IPV6): 493 return br_ip6_multicast_alloc_query(br, &addr->u.ip6); 494#endif 495 } 496 return NULL; 497} 498 499static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp) 500{ 501 struct net_bridge *br = mp->br; 502 struct sk_buff *skb; 503 504 skb = br_multicast_alloc_query(br, &mp->addr); 505 if (!skb) 506 goto timer; 507 508 netif_rx(skb); 509 510timer: 511 if (++mp->queries_sent < br->multicast_last_member_count) 512 mod_timer(&mp->query_timer, 513 jiffies + br->multicast_last_member_interval); 514} 515 516static void br_multicast_group_query_expired(unsigned long data) 517{ 518 struct net_bridge_mdb_entry *mp = (void *)data; 519 struct net_bridge *br = mp->br; 520 521 spin_lock(&br->multicast_lock); 522 if (!netif_running(br->dev) || !mp->mglist || 523 mp->queries_sent >= br->multicast_last_member_count) 524 goto out; 525 526 br_multicast_send_group_query(mp); 527 528out: 529 spin_unlock(&br->multicast_lock); 530} 531 532static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg) 533{ 534 struct net_bridge_port *port = pg->port; 535 struct net_bridge *br = port->br; 536 struct sk_buff *skb; 537 538 skb = br_multicast_alloc_query(br, &pg->addr); 539 if (!skb) 540 goto timer; 541 542 br_deliver(port, skb); 543 544timer: 545 if (++pg->queries_sent < br->multicast_last_member_count) 546 mod_timer(&pg->query_timer, 547 jiffies + br->multicast_last_member_interval); 548} 549 550static void br_multicast_port_group_query_expired(unsigned long data) 551{ 552 struct net_bridge_port_group *pg = (void *)data; 553 struct net_bridge_port *port = pg->port; 554 struct net_bridge *br = port->br; 555 556 spin_lock(&br->multicast_lock); 557 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) || 558 pg->queries_sent >= br->multicast_last_member_count) 559 goto out; 560 561 br_multicast_send_port_group_query(pg); 562 563out: 564 spin_unlock(&br->multicast_lock); 565} 566 567static struct net_bridge_mdb_entry *br_multicast_get_group( 568 struct net_bridge *br, struct net_bridge_port *port, 569 struct br_ip *group, int hash) 570{ 571 struct net_bridge_mdb_htable *mdb = br->mdb; 572 struct net_bridge_mdb_entry *mp; 573 struct hlist_node *p; 574 unsigned count = 0; 575 unsigned max; 576 int elasticity; 577 int err; 578 579 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { 580 count++; 581 if (unlikely(br_ip_equal(group, &mp->addr))) 582 return mp; 583 } 584 585 elasticity = 0; 586 max = mdb->max; 587 588 if (unlikely(count > br->hash_elasticity && count)) { 589 if (net_ratelimit()) 590 br_info(br, "Multicast hash table " 591 "chain limit reached: %s\n", 592 port ? port->dev->name : br->dev->name); 593 594 elasticity = br->hash_elasticity; 595 } 596 597 if (mdb->size >= max) { 598 max *= 2; 599 if (unlikely(max >= br->hash_max)) { 600 br_warn(br, "Multicast hash table maximum " 601 "reached, disabling snooping: %s, %d\n", 602 port ? port->dev->name : br->dev->name, max); 603 err = -E2BIG; 604disable: 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 br_info(br, "Multicast hash table " 614 "on fire: %s\n", 615 port ? port->dev->name : br->dev->name); 616 err = -EEXIST; 617 goto err; 618 } 619 620 err = br_mdb_rehash(&br->mdb, max, elasticity); 621 if (err) { 622 br_warn(br, "Cannot rehash multicast " 623 "hash table, disabling snooping: %s, %d, %d\n", 624 port ? port->dev->name : br->dev->name, 625 mdb->size, err); 626 goto disable; 627 } 628 629 err = -EAGAIN; 630 goto err; 631 } 632 633 return NULL; 634 635err: 636 mp = ERR_PTR(err); 637 return mp; 638} 639 640static struct net_bridge_mdb_entry *br_multicast_new_group( 641 struct net_bridge *br, struct net_bridge_port *port, 642 struct br_ip *group) 643{ 644 struct net_bridge_mdb_htable *mdb = br->mdb; 645 struct net_bridge_mdb_entry *mp; 646 int hash; 647 648 if (!mdb) { 649 if (br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0)) 650 return NULL; 651 goto rehash; 652 } 653 654 hash = br_ip_hash(mdb, group); 655 mp = br_multicast_get_group(br, port, group, hash); 656 switch (PTR_ERR(mp)) { 657 case 0: 658 break; 659 660 case -EAGAIN: 661rehash: 662 mdb = br->mdb; 663 hash = br_ip_hash(mdb, group); 664 break; 665 666 default: 667 goto out; 668 } 669 670 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 671 if (unlikely(!mp)) 672 goto out; 673 674 mp->br = br; 675 mp->addr = *group; 676 setup_timer(&mp->timer, br_multicast_group_expired, 677 (unsigned long)mp); 678 setup_timer(&mp->query_timer, br_multicast_group_query_expired, 679 (unsigned long)mp); 680 681 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); 682 mdb->size++; 683 684out: 685 return mp; 686} 687 688static int br_multicast_add_group(struct net_bridge *br, 689 struct net_bridge_port *port, 690 struct br_ip *group) 691{ 692 struct net_bridge_mdb_entry *mp; 693 struct net_bridge_port_group *p; 694 struct net_bridge_port_group **pp; 695 unsigned long now = jiffies; 696 int err; 697 698 spin_lock(&br->multicast_lock); 699 if (!netif_running(br->dev) || 700 (port && port->state == BR_STATE_DISABLED)) 701 goto out; 702 703 mp = br_multicast_new_group(br, port, group); 704 err = PTR_ERR(mp); 705 if (unlikely(IS_ERR(mp) || !mp)) 706 goto err; 707 708 if (!port) { 709 mp->mglist = true; 710 mod_timer(&mp->timer, now + br->multicast_membership_interval); 711 goto out; 712 } 713 714 for (pp = &mp->ports; (p = *pp); pp = &p->next) { 715 if (p->port == port) 716 goto found; 717 if ((unsigned long)p->port < (unsigned long)port) 718 break; 719 } 720 721 p = kzalloc(sizeof(*p), GFP_ATOMIC); 722 err = -ENOMEM; 723 if (unlikely(!p)) 724 goto err; 725 726 p->addr = *group; 727 p->port = port; 728 p->next = *pp; 729 hlist_add_head(&p->mglist, &port->mglist); 730 setup_timer(&p->timer, br_multicast_port_group_expired, 731 (unsigned long)p); 732 setup_timer(&p->query_timer, br_multicast_port_group_query_expired, 733 (unsigned long)p); 734 735 rcu_assign_pointer(*pp, p); 736 737found: 738 mod_timer(&p->timer, now + br->multicast_membership_interval); 739out: 740 err = 0; 741 742err: 743 spin_unlock(&br->multicast_lock); 744 return err; 745} 746 747static int br_ip4_multicast_add_group(struct net_bridge *br, 748 struct net_bridge_port *port, 749 __be32 group) 750{ 751 struct br_ip br_group; 752 753 if (ipv4_is_local_multicast(group)) 754 return 0; 755 756 br_group.u.ip4 = group; 757 br_group.proto = htons(ETH_P_IP); 758 759 return br_multicast_add_group(br, port, &br_group); 760} 761 762#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 763static int br_ip6_multicast_add_group(struct net_bridge *br, 764 struct net_bridge_port *port, 765 const struct in6_addr *group) 766{ 767 struct br_ip br_group; 768 769 if (ipv6_is_local_multicast(group)) 770 return 0; 771 772 ipv6_addr_copy(&br_group.u.ip6, group); 773 br_group.proto = htons(ETH_P_IP); 774 775 return br_multicast_add_group(br, port, &br_group); 776} 777#endif 778 779static void br_multicast_router_expired(unsigned long data) 780{ 781 struct net_bridge_port *port = (void *)data; 782 struct net_bridge *br = port->br; 783 784 spin_lock(&br->multicast_lock); 785 if (port->multicast_router != 1 || 786 timer_pending(&port->multicast_router_timer) || 787 hlist_unhashed(&port->rlist)) 788 goto out; 789 790 hlist_del_init_rcu(&port->rlist); 791 792out: 793 spin_unlock(&br->multicast_lock); 794} 795 796static void br_multicast_local_router_expired(unsigned long data) 797{ 798} 799 800static void __br_multicast_send_query(struct net_bridge *br, 801 struct net_bridge_port *port, 802 struct br_ip *ip) 803{ 804 struct sk_buff *skb; 805 806 skb = br_multicast_alloc_query(br, ip); 807 if (!skb) 808 return; 809 810 if (port) { 811 __skb_push(skb, sizeof(struct ethhdr)); 812 skb->dev = port->dev; 813 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, 814 dev_queue_xmit); 815 } else 816 netif_rx(skb); 817} 818 819static void br_multicast_send_query(struct net_bridge *br, 820 struct net_bridge_port *port, u32 sent) 821{ 822 unsigned long time; 823 struct br_ip br_group; 824 825 if (!netif_running(br->dev) || br->multicast_disabled || 826 timer_pending(&br->multicast_querier_timer)) 827 return; 828 829 memset(&br_group.u, 0, sizeof(br_group.u)); 830 831 br_group.proto = htons(ETH_P_IP); 832 __br_multicast_send_query(br, port, &br_group); 833 834#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 835 br_group.proto = htons(ETH_P_IPV6); 836 __br_multicast_send_query(br, port, &br_group); 837#endif 838 839 time = jiffies; 840 time += sent < br->multicast_startup_query_count ? 841 br->multicast_startup_query_interval : 842 br->multicast_query_interval; 843 mod_timer(port ? &port->multicast_query_timer : 844 &br->multicast_query_timer, time); 845} 846 847static void br_multicast_port_query_expired(unsigned long data) 848{ 849 struct net_bridge_port *port = (void *)data; 850 struct net_bridge *br = port->br; 851 852 spin_lock(&br->multicast_lock); 853 if (port->state == BR_STATE_DISABLED || 854 port->state == BR_STATE_BLOCKING) 855 goto out; 856 857 if (port->multicast_startup_queries_sent < 858 br->multicast_startup_query_count) 859 port->multicast_startup_queries_sent++; 860 861 br_multicast_send_query(port->br, port, 862 port->multicast_startup_queries_sent); 863 864out: 865 spin_unlock(&br->multicast_lock); 866} 867 868void br_multicast_add_port(struct net_bridge_port *port) 869{ 870 port->multicast_router = 1; 871 872 setup_timer(&port->multicast_router_timer, br_multicast_router_expired, 873 (unsigned long)port); 874 setup_timer(&port->multicast_query_timer, 875 br_multicast_port_query_expired, (unsigned long)port); 876} 877 878void br_multicast_del_port(struct net_bridge_port *port) 879{ 880 del_timer_sync(&port->multicast_router_timer); 881} 882 883static void __br_multicast_enable_port(struct net_bridge_port *port) 884{ 885 port->multicast_startup_queries_sent = 0; 886 887 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || 888 del_timer(&port->multicast_query_timer)) 889 mod_timer(&port->multicast_query_timer, jiffies); 890} 891 892void br_multicast_enable_port(struct net_bridge_port *port) 893{ 894 struct net_bridge *br = port->br; 895 896 spin_lock(&br->multicast_lock); 897 if (br->multicast_disabled || !netif_running(br->dev)) 898 goto out; 899 900 __br_multicast_enable_port(port); 901 902out: 903 spin_unlock(&br->multicast_lock); 904} 905 906void br_multicast_disable_port(struct net_bridge_port *port) 907{ 908 struct net_bridge *br = port->br; 909 struct net_bridge_port_group *pg; 910 struct hlist_node *p, *n; 911 912 spin_lock(&br->multicast_lock); 913 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist) 914 br_multicast_del_pg(br, pg); 915 916 if (!hlist_unhashed(&port->rlist)) 917 hlist_del_init_rcu(&port->rlist); 918 del_timer(&port->multicast_router_timer); 919 del_timer(&port->multicast_query_timer); 920 spin_unlock(&br->multicast_lock); 921} 922 923static int br_ip4_multicast_igmp3_report(struct net_bridge *br, 924 struct net_bridge_port *port, 925 struct sk_buff *skb) 926{ 927 struct igmpv3_report *ih; 928 struct igmpv3_grec *grec; 929 int i; 930 int len; 931 int num; 932 int type; 933 int err = 0; 934 __be32 group; 935 936 if (!pskb_may_pull(skb, sizeof(*ih))) 937 return -EINVAL; 938 939 ih = igmpv3_report_hdr(skb); 940 num = ntohs(ih->ngrec); 941 len = sizeof(*ih); 942 943 for (i = 0; i < num; i++) { 944 len += sizeof(*grec); 945 if (!pskb_may_pull(skb, len)) 946 return -EINVAL; 947 948 grec = (void *)(skb->data + len - sizeof(*grec)); 949 group = grec->grec_mca; 950 type = grec->grec_type; 951 952 len += ntohs(grec->grec_nsrcs) * 4; 953 if (!pskb_may_pull(skb, len)) 954 return -EINVAL; 955 956 /* We treat this as an IGMPv2 report for now. */ 957 switch (type) { 958 case IGMPV3_MODE_IS_INCLUDE: 959 case IGMPV3_MODE_IS_EXCLUDE: 960 case IGMPV3_CHANGE_TO_INCLUDE: 961 case IGMPV3_CHANGE_TO_EXCLUDE: 962 case IGMPV3_ALLOW_NEW_SOURCES: 963 case IGMPV3_BLOCK_OLD_SOURCES: 964 break; 965 966 default: 967 continue; 968 } 969 970 err = br_ip4_multicast_add_group(br, port, group); 971 if (err) 972 break; 973 } 974 975 return err; 976} 977 978#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 979static int br_ip6_multicast_mld2_report(struct net_bridge *br, 980 struct net_bridge_port *port, 981 struct sk_buff *skb) 982{ 983 struct icmp6hdr *icmp6h; 984 struct mld2_grec *grec; 985 int i; 986 int len; 987 int num; 988 int err = 0; 989 990 if (!pskb_may_pull(skb, sizeof(*icmp6h))) 991 return -EINVAL; 992 993 icmp6h = icmp6_hdr(skb); 994 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 995 len = sizeof(*icmp6h); 996 997 for (i = 0; i < num; i++) { 998 __be16 *nsrcs, _nsrcs; 999 1000 nsrcs = skb_header_pointer(skb, 1001 len + offsetof(struct mld2_grec, 1002 grec_mca), 1003 sizeof(_nsrcs), &_nsrcs); 1004 if (!nsrcs) 1005 return -EINVAL; 1006 1007 if (!pskb_may_pull(skb, 1008 len + sizeof(*grec) + 1009 sizeof(struct in6_addr) * (*nsrcs))) 1010 return -EINVAL; 1011 1012 grec = (struct mld2_grec *)(skb->data + len); 1013 len += sizeof(*grec) + sizeof(struct in6_addr) * (*nsrcs); 1014 1015 /* We treat these as MLDv1 reports for now. */ 1016 switch (grec->grec_type) { 1017 case MLD2_MODE_IS_INCLUDE: 1018 case MLD2_MODE_IS_EXCLUDE: 1019 case MLD2_CHANGE_TO_INCLUDE: 1020 case MLD2_CHANGE_TO_EXCLUDE: 1021 case MLD2_ALLOW_NEW_SOURCES: 1022 case MLD2_BLOCK_OLD_SOURCES: 1023 break; 1024 1025 default: 1026 continue; 1027 } 1028 1029 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca); 1030 if (!err) 1031 break; 1032 } 1033 1034 return err; 1035} 1036#endif 1037 1038/* 1039 * Add port to rotuer_list 1040 * list is maintained ordered by pointer value 1041 * and locked by br->multicast_lock and RCU 1042 */ 1043static void br_multicast_add_router(struct net_bridge *br, 1044 struct net_bridge_port *port) 1045{ 1046 struct net_bridge_port *p; 1047 struct hlist_node *n, *slot = NULL; 1048 1049 hlist_for_each_entry(p, n, &br->router_list, rlist) { 1050 if ((unsigned long) port >= (unsigned long) p) 1051 break; 1052 slot = n; 1053 } 1054 1055 if (slot) 1056 hlist_add_after_rcu(slot, &port->rlist); 1057 else 1058 hlist_add_head_rcu(&port->rlist, &br->router_list); 1059} 1060 1061static 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 1081timer: 1082 mod_timer(&port->multicast_router_timer, 1083 now + br->multicast_querier_interval); 1084} 1085 1086static 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 1099static 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 (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 1166out: 1167 spin_unlock(&br->multicast_lock); 1168 return err; 1169} 1170 1171#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1172static 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 (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 1234out: 1235 spin_unlock(&br->multicast_lock); 1236 return err; 1237} 1238#endif 1239 1240static 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 (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 1296out: 1297 spin_unlock(&br->multicast_lock); 1298} 1299 1300static 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) 1316static 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 1332static 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 1419out: 1420 __skb_push(skb2, offset); 1421err_out: 1422 if (skb2 != skb) 1423 kfree_skb(skb2); 1424 return err; 1425} 1426 1427#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1428static 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 int 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 1536out: 1537 __skb_push(skb2, offset); 1538 if (skb2 != skb) 1539 kfree_skb(skb2); 1540 return err; 1541} 1542#endif 1543 1544int 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 1565static 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 1579void 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 1604void 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 1614void 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 1653out: 1654 spin_unlock_bh(&br->multicast_lock); 1655} 1656 1657int 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 1680unlock: 1681 spin_unlock_bh(&br->multicast_lock); 1682 1683 return err; 1684} 1685 1686int 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 1721unlock: 1722 spin_unlock(&br->multicast_lock); 1723 1724 return err; 1725} 1726 1727int br_multicast_toggle(struct net_bridge *br, unsigned long val) 1728{ 1729 struct net_bridge_port *port; 1730 int err = 0; 1731 1732 spin_lock(&br->multicast_lock); 1733 if (br->multicast_disabled == !val) 1734 goto unlock; 1735 1736 br->multicast_disabled = !val; 1737 if (br->multicast_disabled) 1738 goto unlock; 1739 1740 if (!netif_running(br->dev)) 1741 goto unlock; 1742 1743 if (br->mdb) { 1744 if (br->mdb->old) { 1745 err = -EEXIST; 1746rollback: 1747 br->multicast_disabled = !!val; 1748 goto unlock; 1749 } 1750 1751 err = br_mdb_rehash(&br->mdb, br->mdb->max, 1752 br->hash_elasticity); 1753 if (err) 1754 goto rollback; 1755 } 1756 1757 br_multicast_open(br); 1758 list_for_each_entry(port, &br->port_list, list) { 1759 if (port->state == BR_STATE_DISABLED || 1760 port->state == BR_STATE_BLOCKING) 1761 continue; 1762 1763 __br_multicast_enable_port(port); 1764 } 1765 1766unlock: 1767 spin_unlock(&br->multicast_lock); 1768 1769 return err; 1770} 1771 1772int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) 1773{ 1774 int err = -ENOENT; 1775 u32 old; 1776 1777 spin_lock(&br->multicast_lock); 1778 if (!netif_running(br->dev)) 1779 goto unlock; 1780 1781 err = -EINVAL; 1782 if (!is_power_of_2(val)) 1783 goto unlock; 1784 if (br->mdb && val < br->mdb->size) 1785 goto unlock; 1786 1787 err = 0; 1788 1789 old = br->hash_max; 1790 br->hash_max = val; 1791 1792 if (br->mdb) { 1793 if (br->mdb->old) { 1794 err = -EEXIST; 1795rollback: 1796 br->hash_max = old; 1797 goto unlock; 1798 } 1799 1800 err = br_mdb_rehash(&br->mdb, br->hash_max, 1801 br->hash_elasticity); 1802 if (err) 1803 goto rollback; 1804 } 1805 1806unlock: 1807 spin_unlock(&br->multicast_lock); 1808 1809 return err; 1810} 1811