net/bridge/br_multicast.c

   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 #define mlock_dereference(X, br) \
  37         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
  38
  39 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  40 static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
  41 {
  42         if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
  43                 return 1;
  44         return 0;
  45 }
  46 #endif
  47
  48 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
  49 {
  50         if (a->proto != b->proto)
  51                 return 0;
  52         switch (a->proto) {
  53         case htons(ETH_P_IP):
  54                 return a->u.ip4 == b->u.ip4;
  55 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  56         case htons(ETH_P_IPV6):
  57                 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
  58 #endif
  59         }
  60         return 0;
  61 }
  62
  63 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
  64 {
  65         return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
  66 }
  67
  68 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  69 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
  70                                 const struct in6_addr *ip)
  71 {
  72         return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
  73 }
  74 #endif
  75
  76 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
  77                              struct br_ip *ip)
  78 {
  79         switch (ip->proto) {
  80         case htons(ETH_P_IP):
  81                 return __br_ip4_hash(mdb, ip->u.ip4);
  82 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  83         case htons(ETH_P_IPV6):
  84                 return __br_ip6_hash(mdb, &ip->u.ip6);
  85 #endif
  86         }
  87         return 0;
  88 }
  89
  90 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
  91         struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
  92 {
  93         struct net_bridge_mdb_entry *mp;
  94         struct hlist_node *p;
  95
  96         hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
  97                 if (br_ip_equal(&mp->addr, dst))
  98                         return mp;
  99         }
 100
 101         return NULL;
 102 }
 103
 104 static struct net_bridge_mdb_entry *br_mdb_ip_get(
 105         struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
 106 {
 107         if (!mdb)
 108                 return NULL;
 109
 110         return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
 111 }
 112
 113 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
 114         struct net_bridge_mdb_htable *mdb, __be32 dst)
 115 {
 116         struct br_ip br_dst;
 117
 118         br_dst.u.ip4 = dst;
 119         br_dst.proto = htons(ETH_P_IP);
 120
 121         return br_mdb_ip_get(mdb, &br_dst);
 122 }
 123
 124 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 125 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
 126         struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
 127 {
 128         struct br_ip br_dst;
 129
 130         ipv6_addr_copy(&br_dst.u.ip6, dst);
 131         br_dst.proto = htons(ETH_P_IPV6);
 132
 133         return br_mdb_ip_get(mdb, &br_dst);
 134 }
 135 #endif
 136
 137 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 138                                         struct sk_buff *skb)
 139 {
 140         struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
 141         struct br_ip ip;
 142
 143         if (br->multicast_disabled)
 144                 return NULL;
 145
 146         if (BR_INPUT_SKB_CB(skb)->igmp)
 147                 return NULL;
 148
 149         ip.proto = skb->protocol;
 150
 151         switch (skb->protocol) {
 152         case htons(ETH_P_IP):
 153                 ip.u.ip4 = ip_hdr(skb)->daddr;
 154                 break;
 155 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 156         case htons(ETH_P_IPV6):
 157                 ipv6_addr_copy(&ip.u.ip6, &ipv6_hdr(skb)->daddr);
 158                 break;
 159 #endif
 160         default:
 161                 return NULL;
 162         }
 163
 164         return br_mdb_ip_get(mdb, &ip);
 165 }
 166
 167 static void br_mdb_free(struct rcu_head *head)
 168 {
 169         struct net_bridge_mdb_htable *mdb =
 170                 container_of(head, struct net_bridge_mdb_htable, rcu);
 171         struct net_bridge_mdb_htable *old = mdb->old;
 172
 173         mdb->old = NULL;
 174         kfree(old->mhash);
 175         kfree(old);
 176 }
 177
 178 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
 179                        struct net_bridge_mdb_htable *old,
 180                        int elasticity)
 181 {
 182         struct net_bridge_mdb_entry *mp;
 183         struct hlist_node *p;
 184         int maxlen;
 185         int len;
 186         int i;
 187
 188         for (i = 0; i < old->max; i++)
 189                 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
 190                         hlist_add_head(&mp->hlist[new->ver],
 191                                        &new->mhash[br_ip_hash(new, &mp->addr)]);
 192
 193         if (!elasticity)
 194                 return 0;
 195
 196         maxlen = 0;
 197         for (i = 0; i < new->max; i++) {
 198                 len = 0;
 199                 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
 200                         len++;
 201                 if (len > maxlen)
 202                         maxlen = len;
 203         }
 204
 205         return maxlen > elasticity ? -EINVAL : 0;
 206 }
 207
 208 static void br_multicast_free_pg(struct rcu_head *head)
 209 {
 210         struct net_bridge_port_group *p =
 211                 container_of(head, struct net_bridge_port_group, rcu);
 212
 213         kfree(p);
 214 }
 215
 216 static void br_multicast_free_group(struct rcu_head *head)
 217 {
 218         struct net_bridge_mdb_entry *mp =
 219                 container_of(head, struct net_bridge_mdb_entry, rcu);
 220
 221         kfree(mp);
 222 }
 223
 224 static void br_multicast_group_expired(unsigned long data)
 225 {
 226         struct net_bridge_mdb_entry *mp = (void *)data;
 227         struct net_bridge *br = mp->br;
 228         struct net_bridge_mdb_htable *mdb;
 229
 230         spin_lock(&br->multicast_lock);
 231         if (!netif_running(br->dev) || timer_pending(&mp->timer))
 232                 goto out;
 233
 234         mp->mglist = false;
 235
 236         if (mp->ports)
 237                 goto out;
 238
 239         mdb = mlock_dereference(br->mdb, br);
 240
 241         hlist_del_rcu(&mp->hlist[mdb->ver]);
 242         mdb->size--;
 243
 244         call_rcu_bh(&mp->rcu, br_multicast_free_group);
 245
 246 out:
 247         spin_unlock(&br->multicast_lock);
 248 }
 249
 250 static void br_multicast_del_pg(struct net_bridge *br,
 251                                 struct net_bridge_port_group *pg)
 252 {
 253         struct net_bridge_mdb_htable *mdb;
 254         struct net_bridge_mdb_entry *mp;
 255         struct net_bridge_port_group *p;
 256         struct net_bridge_port_group __rcu **pp;
 257
 258         mdb = mlock_dereference(br->mdb, br);
 259
 260         mp = br_mdb_ip_get(mdb, &pg->addr);
 261         if (WARN_ON(!mp))
 262                 return;
 263
 264         for (pp = &mp->ports;
 265              (p = mlock_dereference(*pp, br)) != NULL;
 266              pp = &p->next) {
 267                 if (p != pg)
 268                         continue;
 269
 270                 rcu_assign_pointer(*pp, p->next);
 271                 hlist_del_init(&p->mglist);
 272                 del_timer(&p->timer);
 273                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
 274
 275                 if (!mp->ports && !mp->mglist &&
 276                     netif_running(br->dev))
 277                         mod_timer(&mp->timer, jiffies);
 278
 279                 return;
 280         }
 281
 282         WARN_ON(1);
 283 }
 284
 285 static void br_multicast_port_group_expired(unsigned long data)
 286 {
 287         struct net_bridge_port_group *pg = (void *)data;
 288         struct net_bridge *br = pg->port->br;
 289
 290         spin_lock(&br->multicast_lock);
 291         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
 292             hlist_unhashed(&pg->mglist))
 293                 goto out;
 294
 295         br_multicast_del_pg(br, pg);
 296
 297 out:
 298         spin_unlock(&br->multicast_lock);
 299 }
 300
 301 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
 302                          int elasticity)
 303 {
 304         struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
 305         struct net_bridge_mdb_htable *mdb;
 306         int err;
 307
 308         mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
 309         if (!mdb)
 310                 return -ENOMEM;
 311
 312         mdb->max = max;
 313         mdb->old = old;
 314
 315         mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
 316         if (!mdb->mhash) {
 317                 kfree(mdb);
 318                 return -ENOMEM;
 319         }
 320
 321         mdb->size = old ? old->size : 0;
 322         mdb->ver = old ? old->ver ^ 1 : 0;
 323
 324         if (!old || elasticity)
 325                 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
 326         else
 327                 mdb->secret = old->secret;
 328
 329         if (!old)
 330                 goto out;
 331
 332         err = br_mdb_copy(mdb, old, elasticity);
 333         if (err) {
 334                 kfree(mdb->mhash);
 335                 kfree(mdb);
 336                 return err;
 337         }
 338
 339         call_rcu_bh(&mdb->rcu, br_mdb_free);
 340
 341 out:
 342         rcu_assign_pointer(*mdbp, mdb);
 343
 344         return 0;
 345 }
 346
 347 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
 348                                                     __be32 group)
 349 {
 350         struct sk_buff *skb;
 351         struct igmphdr *ih;
 352         struct ethhdr *eth;
 353         struct iphdr *iph;
 354
 355         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
 356                                                  sizeof(*ih) + 4);
 357         if (!skb)
 358                 goto out;
 359
 360         skb->protocol = htons(ETH_P_IP);
 361
 362         skb_reset_mac_header(skb);
 363         eth = eth_hdr(skb);
 364
 365         memcpy(eth->h_source, br->dev->dev_addr, 6);
 366         eth->h_dest[0] = 1;
 367         eth->h_dest[1] = 0;
 368         eth->h_dest[2] = 0x5e;
 369         eth->h_dest[3] = 0;
 370         eth->h_dest[4] = 0;
 371         eth->h_dest[5] = 1;
 372         eth->h_proto = htons(ETH_P_IP);
 373         skb_put(skb, sizeof(*eth));
 374
 375         skb_set_network_header(skb, skb->len);
 376         iph = ip_hdr(skb);
 377
 378         iph->version = 4;
 379         iph->ihl = 6;
 380         iph->tos = 0xc0;
 381         iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
 382         iph->id = 0;
 383         iph->frag_off = htons(IP_DF);
 384         iph->ttl = 1;
 385         iph->protocol = IPPROTO_IGMP;
 386         iph->saddr = 0;
 387         iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 388         ((u8 *)&iph[1])[0] = IPOPT_RA;
 389         ((u8 *)&iph[1])[1] = 4;
 390         ((u8 *)&iph[1])[2] = 0;
 391         ((u8 *)&iph[1])[3] = 0;
 392         ip_send_check(iph);
 393         skb_put(skb, 24);
 394
 395         skb_set_transport_header(skb, skb->len);
 396         ih = igmp_hdr(skb);
 397         ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
 398         ih->code = (group ? br->multicast_last_member_interval :
 399                             br->multicast_query_response_interval) /
 400                    (HZ / IGMP_TIMER_SCALE);
 401         ih->group = group;
 402         ih->csum = 0;
 403         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 404         skb_put(skb, sizeof(*ih));
 405
 406         __skb_pull(skb, sizeof(*eth));
 407
 408 out:
 409         return skb;
 410 }
 411
 412 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 413 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
 414                                                     const struct in6_addr *group)
 415 {
 416         struct sk_buff *skb;
 417         struct ipv6hdr *ip6h;
 418         struct mld_msg *mldq;
 419         struct ethhdr *eth;
 420         u8 *hopopt;
 421         unsigned long interval;
 422
 423         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
 424                                                  8 + sizeof(*mldq));
 425         if (!skb)
 426                 goto out;
 427
 428         skb->protocol = htons(ETH_P_IPV6);
 429
 430         /* Ethernet header */
 431         skb_reset_mac_header(skb);
 432         eth = eth_hdr(skb);
 433
 434         memcpy(eth->h_source, br->dev->dev_addr, 6);
 435         eth->h_proto = htons(ETH_P_IPV6);
 436         skb_put(skb, sizeof(*eth));
 437
 438         /* IPv6 header + HbH option */
 439         skb_set_network_header(skb, skb->len);
 440         ip6h = ipv6_hdr(skb);
 441
 442         *(__force __be32 *)ip6h = htonl(0x60000000);
 443         ip6h->payload_len = htons(8 + sizeof(*mldq));
 444         ip6h->nexthdr = IPPROTO_HOPOPTS;
 445         ip6h->hop_limit = 1;
 446         ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
 447         if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
 448                                &ip6h->saddr)) {
 449                 kfree_skb(skb);
 450                 return NULL;
 451         }
 452         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 453
 454         hopopt = (u8 *)(ip6h + 1);
 455         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
 456         hopopt[1] = 0;                          /* length of HbH */
 457         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
 458         hopopt[3] = 2;                          /* Length of RA Option */
 459         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
 460         hopopt[5] = 0;
 461         hopopt[6] = IPV6_TLV_PAD0;              /* Pad0 */
 462         hopopt[7] = IPV6_TLV_PAD0;              /* Pad0 */
 463
 464         skb_put(skb, sizeof(*ip6h) + 8);
 465
 466         /* ICMPv6 */
 467         skb_set_transport_header(skb, skb->len);
 468         mldq = (struct mld_msg *) icmp6_hdr(skb);
 469
 470         interval = ipv6_addr_any(group) ?
 471                         br->multicast_query_response_interval :
 472                         br->multicast_last_member_interval;
 473
 474         mldq->mld_type = ICMPV6_MGM_QUERY;
 475         mldq->mld_code = 0;
 476         mldq->mld_cksum = 0;
 477         mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
 478         mldq->mld_reserved = 0;
 479         ipv6_addr_copy(&mldq->mld_mca, group);
 480
 481         /* checksum */
 482         mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 483                                           sizeof(*mldq), IPPROTO_ICMPV6,
 484                                           csum_partial(mldq,
 485                                                        sizeof(*mldq), 0));
 486         skb_put(skb, sizeof(*mldq));
 487
 488         __skb_pull(skb, sizeof(*eth));
 489
 490 out:
 491         return skb;
 492 }
 493 #endif
 494
 495 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 496                                                 struct br_ip *addr)
 497 {
 498         switch (addr->proto) {
 499         case htons(ETH_P_IP):
 500                 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
 501 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 502         case htons(ETH_P_IPV6):
 503                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
 504 #endif
 505         }
 506         return NULL;
 507 }
 508
 509 static struct net_bridge_mdb_entry *br_multicast_get_group(
 510         struct net_bridge *br, struct net_bridge_port *port,
 511         struct br_ip *group, int hash)
 512 {
 513         struct net_bridge_mdb_htable *mdb;
 514         struct net_bridge_mdb_entry *mp;
 515         struct hlist_node *p;
 516         unsigned count = 0;
 517         unsigned max;
 518         int elasticity;
 519         int err;
 520
 521         mdb = rcu_dereference_protected(br->mdb, 1);
 522         hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
 523                 count++;
 524                 if (unlikely(br_ip_equal(group, &mp->addr)))
 525                         return mp;
 526         }
 527
 528         elasticity = 0;
 529         max = mdb->max;
 530
 531         if (unlikely(count > br->hash_elasticity && count)) {
 532                 if (net_ratelimit())
 533                         br_info(br, "Multicast hash table "
 534                                 "chain limit reached: %s\n",
 535                                 port ? port->dev->name : br->dev->name);
 536
 537                 elasticity = br->hash_elasticity;
 538         }
 539
 540         if (mdb->size >= max) {
 541                 max *= 2;
 542                 if (unlikely(max >= br->hash_max)) {
 543                         br_warn(br, "Multicast hash table maximum "
 544                                 "reached, disabling snooping: %s, %d\n",
 545                                 port ? port->dev->name : br->dev->name, max);
 546                         err = -E2BIG;
 547 disable:
 548                         br->multicast_disabled = 1;
 549                         goto err;
 550                 }
 551         }
 552
 553         if (max > mdb->max || elasticity) {
 554                 if (mdb->old) {
 555                         if (net_ratelimit())
 556                                 br_info(br, "Multicast hash table "
 557                                         "on fire: %s\n",
 558                                         port ? port->dev->name : br->dev->name);
 559                         err = -EEXIST;
 560                         goto err;
 561                 }
 562
 563                 err = br_mdb_rehash(&br->mdb, max, elasticity);
 564                 if (err) {
 565                         br_warn(br, "Cannot rehash multicast "
 566                                 "hash table, disabling snooping: %s, %d, %d\n",
 567                                 port ? port->dev->name : br->dev->name,
 568                                 mdb->size, err);
 569                         goto disable;
 570                 }
 571
 572                 err = -EAGAIN;
 573                 goto err;
 574         }
 575
 576         return NULL;
 577
 578 err:
 579         mp = ERR_PTR(err);
 580         return mp;
 581 }
 582
 583 static struct net_bridge_mdb_entry *br_multicast_new_group(
 584         struct net_bridge *br, struct net_bridge_port *port,
 585         struct br_ip *group)
 586 {
 587         struct net_bridge_mdb_htable *mdb;
 588         struct net_bridge_mdb_entry *mp;
 589         int hash;
 590         int err;
 591
 592         mdb = rcu_dereference_protected(br->mdb, 1);
 593         if (!mdb) {
 594                 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
 595                 if (err)
 596                         return ERR_PTR(err);
 597                 goto rehash;
 598         }
 599
 600         hash = br_ip_hash(mdb, group);
 601         mp = br_multicast_get_group(br, port, group, hash);
 602         switch (PTR_ERR(mp)) {
 603         case 0:
 604                 break;
 605
 606         case -EAGAIN:
 607 rehash:
 608                 mdb = rcu_dereference_protected(br->mdb, 1);
 609                 hash = br_ip_hash(mdb, group);
 610                 break;
 611
 612         default:
 613                 goto out;
 614         }
 615
 616         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 617         if (unlikely(!mp))
 618                 return ERR_PTR(-ENOMEM);
 619
 620         mp->br = br;
 621         mp->addr = *group;
 622         setup_timer(&mp->timer, br_multicast_group_expired,
 623                     (unsigned long)mp);
 624
 625         hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
 626         mdb->size++;
 627
 628 out:
 629         return mp;
 630 }
 631
 632 static int br_multicast_add_group(struct net_bridge *br,
 633                                   struct net_bridge_port *port,
 634                                   struct br_ip *group)
 635 {
 636         struct net_bridge_mdb_entry *mp;
 637         struct net_bridge_port_group *p;
 638         struct net_bridge_port_group __rcu **pp;
 639         unsigned long now = jiffies;
 640         int err;
 641
 642         spin_lock(&br->multicast_lock);
 643         if (!netif_running(br->dev) ||
 644             (port && port->state == BR_STATE_DISABLED))
 645                 goto out;
 646
 647         mp = br_multicast_new_group(br, port, group);
 648         err = PTR_ERR(mp);
 649         if (IS_ERR(mp))
 650                 goto err;
 651
 652         if (!port) {
 653                 mp->mglist = true;
 654                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
 655                 goto out;
 656         }
 657
 658         for (pp = &mp->ports;
 659              (p = mlock_dereference(*pp, br)) != NULL;
 660              pp = &p->next) {
 661                 if (p->port == port)
 662                         goto found;
 663                 if ((unsigned long)p->port < (unsigned long)port)
 664                         break;
 665         }
 666
 667         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 668         err = -ENOMEM;
 669         if (unlikely(!p))
 670                 goto err;
 671
 672         p->addr = *group;
 673         p->port = port;
 674         p->next = *pp;
 675         hlist_add_head(&p->mglist, &port->mglist);
 676         setup_timer(&p->timer, br_multicast_port_group_expired,
 677                     (unsigned long)p);
 678
 679         rcu_assign_pointer(*pp, p);
 680
 681 found:
 682         mod_timer(&p->timer, now + br->multicast_membership_interval);
 683 out:
 684         err = 0;
 685
 686 err:
 687         spin_unlock(&br->multicast_lock);
 688         return err;
 689 }
 690
 691 static int br_ip4_multicast_add_group(struct net_bridge *br,
 692                                       struct net_bridge_port *port,
 693                                       __be32 group)
 694 {
 695         struct br_ip br_group;
 696
 697         if (ipv4_is_local_multicast(group))
 698                 return 0;
 699
 700         br_group.u.ip4 = group;
 701         br_group.proto = htons(ETH_P_IP);
 702
 703         return br_multicast_add_group(br, port, &br_group);
 704 }
 705
 706 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 707 static int br_ip6_multicast_add_group(struct net_bridge *br,
 708                                       struct net_bridge_port *port,
 709                                       const struct in6_addr *group)
 710 {
 711         struct br_ip br_group;
 712
 713         if (!ipv6_is_transient_multicast(group))
 714                 return 0;
 715
 716         ipv6_addr_copy(&br_group.u.ip6, group);
 717         br_group.proto = htons(ETH_P_IPV6);
 718
 719         return br_multicast_add_group(br, port, &br_group);
 720 }
 721 #endif
 722
 723 static void br_multicast_router_expired(unsigned long data)
 724 {
 725         struct net_bridge_port *port = (void *)data;
 726         struct net_bridge *br = port->br;
 727
 728         spin_lock(&br->multicast_lock);
 729         if (port->multicast_router != 1 ||
 730             timer_pending(&port->multicast_router_timer) ||
 731             hlist_unhashed(&port->rlist))
 732                 goto out;
 733
 734         hlist_del_init_rcu(&port->rlist);
 735
 736 out:
 737         spin_unlock(&br->multicast_lock);
 738 }
 739
 740 static void br_multicast_local_router_expired(unsigned long data)
 741 {
 742 }
 743
 744 static void __br_multicast_send_query(struct net_bridge *br,
 745                                       struct net_bridge_port *port,
 746                                       struct br_ip *ip)
 747 {
 748         struct sk_buff *skb;
 749
 750         skb = br_multicast_alloc_query(br, ip);
 751         if (!skb)
 752                 return;
 753
 754         if (port) {
 755                 __skb_push(skb, sizeof(struct ethhdr));
 756                 skb->dev = port->dev;
 757                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
 758                         dev_queue_xmit);
 759         } else
 760                 netif_rx(skb);
 761 }
 762
 763 static void br_multicast_send_query(struct net_bridge *br,
 764                                     struct net_bridge_port *port, u32 sent)
 765 {
 766         unsigned long time;
 767         struct br_ip br_group;
 768
 769         if (!netif_running(br->dev) || br->multicast_disabled ||
 770             timer_pending(&br->multicast_querier_timer))
 771                 return;
 772
 773         memset(&br_group.u, 0, sizeof(br_group.u));
 774
 775         br_group.proto = htons(ETH_P_IP);
 776         __br_multicast_send_query(br, port, &br_group);
 777
 778 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 779         br_group.proto = htons(ETH_P_IPV6);
 780         __br_multicast_send_query(br, port, &br_group);
 781 #endif
 782
 783         time = jiffies;
 784         time += sent < br->multicast_startup_query_count ?
 785                 br->multicast_startup_query_interval :
 786                 br->multicast_query_interval;
 787         mod_timer(port ? &port->multicast_query_timer :
 788                          &br->multicast_query_timer, time);
 789 }
 790
 791 static void br_multicast_port_query_expired(unsigned long data)
 792 {
 793         struct net_bridge_port *port = (void *)data;
 794         struct net_bridge *br = port->br;
 795
 796         spin_lock(&br->multicast_lock);
 797         if (port->state == BR_STATE_DISABLED ||
 798             port->state == BR_STATE_BLOCKING)
 799                 goto out;
 800
 801         if (port->multicast_startup_queries_sent <
 802             br->multicast_startup_query_count)
 803                 port->multicast_startup_queries_sent++;
 804
 805         br_multicast_send_query(port->br, port,
 806                                 port->multicast_startup_queries_sent);
 807
 808 out:
 809         spin_unlock(&br->multicast_lock);
 810 }
 811
 812 void br_multicast_add_port(struct net_bridge_port *port)
 813 {
 814         port->multicast_router = 1;
 815
 816         setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
 817                     (unsigned long)port);
 818         setup_timer(&port->multicast_query_timer,
 819                     br_multicast_port_query_expired, (unsigned long)port);
 820 }
 821
 822 void br_multicast_del_port(struct net_bridge_port *port)
 823 {
 824         del_timer_sync(&port->multicast_router_timer);
 825 }
 826
 827 static void __br_multicast_enable_port(struct net_bridge_port *port)
 828 {
 829         port->multicast_startup_queries_sent = 0;
 830
 831         if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
 832             del_timer(&port->multicast_query_timer))
 833                 mod_timer(&port->multicast_query_timer, jiffies);
 834 }
 835
 836 void br_multicast_enable_port(struct net_bridge_port *port)
 837 {
 838         struct net_bridge *br = port->br;
 839
 840         spin_lock(&br->multicast_lock);
 841         if (br->multicast_disabled || !netif_running(br->dev))
 842                 goto out;
 843
 844         __br_multicast_enable_port(port);
 845
 846 out:
 847         spin_unlock(&br->multicast_lock);
 848 }
 849
 850 void br_multicast_disable_port(struct net_bridge_port *port)
 851 {
 852         struct net_bridge *br = port->br;
 853         struct net_bridge_port_group *pg;
 854         struct hlist_node *p, *n;
 855
 856         spin_lock(&br->multicast_lock);
 857         hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
 858                 br_multicast_del_pg(br, pg);
 859
 860         if (!hlist_unhashed(&port->rlist))
 861                 hlist_del_init_rcu(&port->rlist);
 862         del_timer(&port->multicast_router_timer);
 863         del_timer(&port->multicast_query_timer);
 864         spin_unlock(&br->multicast_lock);
 865 }
 866
 867 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
 868                                          struct net_bridge_port *port,
 869                                          struct sk_buff *skb)
 870 {
 871         struct igmpv3_report *ih;
 872         struct igmpv3_grec *grec;
 873         int i;
 874         int len;
 875         int num;
 876         int type;
 877         int err = 0;
 878         __be32 group;
 879
 880         if (!pskb_may_pull(skb, sizeof(*ih)))
 881                 return -EINVAL;
 882
 883         ih = igmpv3_report_hdr(skb);
 884         num = ntohs(ih->ngrec);
 885         len = sizeof(*ih);
 886
 887         for (i = 0; i < num; i++) {
 888                 len += sizeof(*grec);
 889                 if (!pskb_may_pull(skb, len))
 890                         return -EINVAL;
 891
 892                 grec = (void *)(skb->data + len - sizeof(*grec));
 893                 group = grec->grec_mca;
 894                 type = grec->grec_type;
 895
 896                 len += ntohs(grec->grec_nsrcs) * 4;
 897                 if (!pskb_may_pull(skb, len))
 898                         return -EINVAL;
 899
 900                 /* We treat this as an IGMPv2 report for now. */
 901                 switch (type) {
 902                 case IGMPV3_MODE_IS_INCLUDE:
 903                 case IGMPV3_MODE_IS_EXCLUDE:
 904                 case IGMPV3_CHANGE_TO_INCLUDE:
 905                 case IGMPV3_CHANGE_TO_EXCLUDE:
 906                 case IGMPV3_ALLOW_NEW_SOURCES:
 907                 case IGMPV3_BLOCK_OLD_SOURCES:
 908                         break;
 909
 910                 default:
 911                         continue;
 912                 }
 913
 914                 err = br_ip4_multicast_add_group(br, port, group);
 915                 if (err)
 916                         break;
 917         }
 918
 919         return err;
 920 }
 921
 922 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 923 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
 924                                         struct net_bridge_port *port,
 925                                         struct sk_buff *skb)
 926 {
 927         struct icmp6hdr *icmp6h;
 928         struct mld2_grec *grec;
 929         int i;
 930         int len;
 931         int num;
 932         int err = 0;
 933
 934         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
 935                 return -EINVAL;
 936
 937         icmp6h = icmp6_hdr(skb);
 938         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
 939         len = sizeof(*icmp6h);
 940
 941         for (i = 0; i < num; i++) {
 942                 __be16 *nsrcs, _nsrcs;
 943
 944                 nsrcs = skb_header_pointer(skb,
 945                                            len + offsetof(struct mld2_grec,
 946                                                           grec_nsrcs),
 947                                            sizeof(_nsrcs), &_nsrcs);
 948                 if (!nsrcs)
 949                         return -EINVAL;
 950
 951                 if (!pskb_may_pull(skb,
 952                                    len + sizeof(*grec) +
 953                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
 954                         return -EINVAL;
 955
 956                 grec = (struct mld2_grec *)(skb->data + len);
 957                 len += sizeof(*grec) +
 958                        sizeof(struct in6_addr) * ntohs(*nsrcs);
 959
 960                 /* We treat these as MLDv1 reports for now. */
 961                 switch (grec->grec_type) {
 962                 case MLD2_MODE_IS_INCLUDE:
 963                 case MLD2_MODE_IS_EXCLUDE:
 964                 case MLD2_CHANGE_TO_INCLUDE:
 965                 case MLD2_CHANGE_TO_EXCLUDE:
 966                 case MLD2_ALLOW_NEW_SOURCES:
 967                 case MLD2_BLOCK_OLD_SOURCES:
 968                         break;
 969
 970                 default:
 971                         continue;
 972                 }
 973
 974                 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
 975                 if (!err)
 976                         break;
 977         }
 978
 979         return err;
 980 }
 981 #endif
 982
 983 /*
 984  * Add port to rotuer_list
 985  *  list is maintained ordered by pointer value
 986  *  and locked by br->multicast_lock and RCU
 987  */
 988 static void br_multicast_add_router(struct net_bridge *br,
 989                                     struct net_bridge_port *port)
 990 {
 991         struct net_bridge_port *p;
 992         struct hlist_node *n, *slot = NULL;
 993
 994         hlist_for_each_entry(p, n, &br->router_list, rlist) {
 995                 if ((unsigned long) port >= (unsigned long) p)
 996                         break;
 997                 slot = n;
 998         }
 999
1000         if (slot)
1001                 hlist_add_after_rcu(slot, &port->rlist);
1002         else
1003                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1004 }
1005
1006 static void br_multicast_mark_router(struct net_bridge *br,
1007                                      struct net_bridge_port *port)
1008 {
1009         unsigned long now = jiffies;
1010
1011         if (!port) {
1012                 if (br->multicast_router == 1)
1013                         mod_timer(&br->multicast_router_timer,
1014                                   now + br->multicast_querier_interval);
1015                 return;
1016         }
1017
1018         if (port->multicast_router != 1)
1019                 return;
1020
1021         if (!hlist_unhashed(&port->rlist))
1022                 goto timer;
1023
1024         br_multicast_add_router(br, port);
1025
1026 timer:
1027         mod_timer(&port->multicast_router_timer,
1028                   now + br->multicast_querier_interval);
1029 }
1030
1031 static void br_multicast_query_received(struct net_bridge *br,
1032                                         struct net_bridge_port *port,
1033                                         int saddr)
1034 {
1035         if (saddr)
1036                 mod_timer(&br->multicast_querier_timer,
1037                           jiffies + br->multicast_querier_interval);
1038         else if (timer_pending(&br->multicast_querier_timer))
1039                 return;
1040
1041         br_multicast_mark_router(br, port);
1042 }
1043
1044 static int br_ip4_multicast_query(struct net_bridge *br,
1045                                   struct net_bridge_port *port,
1046                                   struct sk_buff *skb)
1047 {
1048         const struct iphdr *iph = ip_hdr(skb);
1049         struct igmphdr *ih = igmp_hdr(skb);
1050         struct net_bridge_mdb_entry *mp;
1051         struct igmpv3_query *ih3;
1052         struct net_bridge_port_group *p;
1053         struct net_bridge_port_group __rcu **pp;
1054         unsigned long max_delay;
1055         unsigned long now = jiffies;
1056         __be32 group;
1057         int err = 0;
1058
1059         spin_lock(&br->multicast_lock);
1060         if (!netif_running(br->dev) ||
1061             (port && port->state == BR_STATE_DISABLED))
1062                 goto out;
1063
1064         br_multicast_query_received(br, port, !!iph->saddr);
1065
1066         group = ih->group;
1067
1068         if (skb->len == sizeof(*ih)) {
1069                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1070
1071                 if (!max_delay) {
1072                         max_delay = 10 * HZ;
1073                         group = 0;
1074                 }
1075         } else {
1076                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1077                         err = -EINVAL;
1078                         goto out;
1079                 }
1080
1081                 ih3 = igmpv3_query_hdr(skb);
1082                 if (ih3->nsrcs)
1083                         goto out;
1084
1085                 max_delay = ih3->code ?
1086                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1087         }
1088
1089         if (!group)
1090                 goto out;
1091
1092         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
1093         if (!mp)
1094                 goto out;
1095
1096         max_delay *= br->multicast_last_member_count;
1097
1098         if (mp->mglist &&
1099             (timer_pending(&mp->timer) ?
1100              time_after(mp->timer.expires, now + max_delay) :
1101              try_to_del_timer_sync(&mp->timer) >= 0))
1102                 mod_timer(&mp->timer, now + max_delay);
1103
1104         for (pp = &mp->ports;
1105              (p = mlock_dereference(*pp, br)) != NULL;
1106              pp = &p->next) {
1107                 if (timer_pending(&p->timer) ?
1108                     time_after(p->timer.expires, now + max_delay) :
1109                     try_to_del_timer_sync(&p->timer) >= 0)
1110                         mod_timer(&p->timer, now + max_delay);
1111         }
1112
1113 out:
1114         spin_unlock(&br->multicast_lock);
1115         return err;
1116 }
1117
1118 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1119 static int br_ip6_multicast_query(struct net_bridge *br,
1120                                   struct net_bridge_port *port,
1121                                   struct sk_buff *skb)
1122 {
1123         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1124         struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
1125         struct net_bridge_mdb_entry *mp;
1126         struct mld2_query *mld2q;
1127         struct net_bridge_port_group *p;
1128         struct net_bridge_port_group __rcu **pp;
1129         unsigned long max_delay;
1130         unsigned long now = jiffies;
1131         const struct in6_addr *group = NULL;
1132         int err = 0;
1133
1134         spin_lock(&br->multicast_lock);
1135         if (!netif_running(br->dev) ||
1136             (port && port->state == BR_STATE_DISABLED))
1137                 goto out;
1138
1139         br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1140
1141         /* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */
1142         if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
1143                 err = -EINVAL;
1144                 goto out;
1145         }
1146
1147         if (skb->len == sizeof(*mld)) {
1148                 if (!pskb_may_pull(skb, sizeof(*mld))) {
1149                         err = -EINVAL;
1150                         goto out;
1151                 }
1152                 mld = (struct mld_msg *) icmp6_hdr(skb);
1153                 max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay));
1154                 if (max_delay)
1155                         group = &mld->mld_mca;
1156         } else if (skb->len >= sizeof(*mld2q)) {
1157                 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1158                         err = -EINVAL;
1159                         goto out;
1160                 }
1161                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1162                 if (!mld2q->mld2q_nsrcs)
1163                         group = &mld2q->mld2q_mca;
1164
1165                 max_delay = max(msecs_to_jiffies(MLDV2_MRC(ntohs(mld2q->mld2q_mrc))), 1UL);
1166         }
1167
1168         if (!group)
1169                 goto out;
1170
1171         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
1172         if (!mp)
1173                 goto out;
1174
1175         max_delay *= br->multicast_last_member_count;
1176         if (mp->mglist &&
1177             (timer_pending(&mp->timer) ?
1178              time_after(mp->timer.expires, now + max_delay) :
1179              try_to_del_timer_sync(&mp->timer) >= 0))
1180                 mod_timer(&mp->timer, now + max_delay);
1181
1182         for (pp = &mp->ports;
1183              (p = mlock_dereference(*pp, br)) != NULL;
1184              pp = &p->next) {
1185                 if (timer_pending(&p->timer) ?
1186                     time_after(p->timer.expires, now + max_delay) :
1187                     try_to_del_timer_sync(&p->timer) >= 0)
1188                         mod_timer(&p->timer, now + max_delay);
1189         }
1190
1191 out:
1192         spin_unlock(&br->multicast_lock);
1193         return err;
1194 }
1195 #endif
1196
1197 static void br_multicast_leave_group(struct net_bridge *br,
1198                                      struct net_bridge_port *port,
1199                                      struct br_ip *group)
1200 {
1201         struct net_bridge_mdb_htable *mdb;
1202         struct net_bridge_mdb_entry *mp;
1203         struct net_bridge_port_group *p;
1204         unsigned long now;
1205         unsigned long time;
1206
1207         spin_lock(&br->multicast_lock);
1208         if (!netif_running(br->dev) ||
1209             (port && port->state == BR_STATE_DISABLED) ||
1210             timer_pending(&br->multicast_querier_timer))
1211                 goto out;
1212
1213         mdb = mlock_dereference(br->mdb, br);
1214         mp = br_mdb_ip_get(mdb, group);
1215         if (!mp)
1216                 goto out;
1217
1218         now = jiffies;
1219         time = now + br->multicast_last_member_count *
1220                      br->multicast_last_member_interval;
1221
1222         if (!port) {
1223                 if (mp->mglist &&
1224                     (timer_pending(&mp->timer) ?
1225                      time_after(mp->timer.expires, time) :
1226                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1227                         mod_timer(&mp->timer, time);
1228                 }
1229
1230                 goto out;
1231         }
1232
1233         for (p = mlock_dereference(mp->ports, br);
1234              p != NULL;
1235              p = mlock_dereference(p->next, br)) {
1236                 if (p->port != port)
1237                         continue;
1238
1239                 if (!hlist_unhashed(&p->mglist) &&
1240                     (timer_pending(&p->timer) ?
1241                      time_after(p->timer.expires, time) :
1242                      try_to_del_timer_sync(&p->timer) >= 0)) {
1243                         mod_timer(&p->timer, time);
1244                 }
1245
1246                 break;
1247         }
1248
1249 out:
1250         spin_unlock(&br->multicast_lock);
1251 }
1252
1253 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1254                                          struct net_bridge_port *port,
1255                                          __be32 group)
1256 {
1257         struct br_ip br_group;
1258
1259         if (ipv4_is_local_multicast(group))
1260                 return;
1261
1262         br_group.u.ip4 = group;
1263         br_group.proto = htons(ETH_P_IP);
1264
1265         br_multicast_leave_group(br, port, &br_group);
1266 }
1267
1268 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1269 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1270                                          struct net_bridge_port *port,
1271                                          const struct in6_addr *group)
1272 {
1273         struct br_ip br_group;
1274
1275         if (!ipv6_is_transient_multicast(group))
1276                 return;
1277
1278         ipv6_addr_copy(&br_group.u.ip6, group);
1279         br_group.proto = htons(ETH_P_IPV6);
1280
1281         br_multicast_leave_group(br, port, &br_group);
1282 }
1283 #endif
1284
1285 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1286                                  struct net_bridge_port *port,
1287                                  struct sk_buff *skb)
1288 {
1289         struct sk_buff *skb2 = skb;
1290         const struct iphdr *iph;
1291         struct igmphdr *ih;
1292         unsigned len;
1293         unsigned offset;
1294         int err;
1295
1296         /* We treat OOM as packet loss for now. */
1297         if (!pskb_may_pull(skb, sizeof(*iph)))
1298                 return -EINVAL;
1299
1300         iph = ip_hdr(skb);
1301
1302         if (iph->ihl < 5 || iph->version != 4)
1303                 return -EINVAL;
1304
1305         if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1306                 return -EINVAL;
1307
1308         iph = ip_hdr(skb);
1309
1310         if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1311                 return -EINVAL;
1312
1313         if (iph->protocol != IPPROTO_IGMP) {
1314                 if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP)
1315                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1316                 return 0;
1317         }
1318
1319         len = ntohs(iph->tot_len);
1320         if (skb->len < len || len < ip_hdrlen(skb))
1321                 return -EINVAL;
1322
1323         if (skb->len > len) {
1324                 skb2 = skb_clone(skb, GFP_ATOMIC);
1325                 if (!skb2)
1326                         return -ENOMEM;
1327
1328                 err = pskb_trim_rcsum(skb2, len);
1329                 if (err)
1330                         goto err_out;
1331         }
1332
1333         len -= ip_hdrlen(skb2);
1334         offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1335         __skb_pull(skb2, offset);
1336         skb_reset_transport_header(skb2);
1337
1338         err = -EINVAL;
1339         if (!pskb_may_pull(skb2, sizeof(*ih)))
1340                 goto out;
1341
1342         switch (skb2->ip_summed) {
1343         case CHECKSUM_COMPLETE:
1344                 if (!csum_fold(skb2->csum))
1345                         break;
1346                 /* fall through */
1347         case CHECKSUM_NONE:
1348                 skb2->csum = 0;
1349                 if (skb_checksum_complete(skb2))
1350                         goto out;
1351         }
1352
1353         err = 0;
1354
1355         BR_INPUT_SKB_CB(skb)->igmp = 1;
1356         ih = igmp_hdr(skb2);
1357
1358         switch (ih->type) {
1359         case IGMP_HOST_MEMBERSHIP_REPORT:
1360         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1361                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1362                 err = br_ip4_multicast_add_group(br, port, ih->group);
1363                 break;
1364         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1365                 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1366                 break;
1367         case IGMP_HOST_MEMBERSHIP_QUERY:
1368                 err = br_ip4_multicast_query(br, port, skb2);
1369                 break;
1370         case IGMP_HOST_LEAVE_MESSAGE:
1371                 br_ip4_multicast_leave_group(br, port, ih->group);
1372                 break;
1373         }
1374
1375 out:
1376         __skb_push(skb2, offset);
1377 err_out:
1378         if (skb2 != skb)
1379                 kfree_skb(skb2);
1380         return err;
1381 }
1382
1383 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1384 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1385                                  struct net_bridge_port *port,
1386                                  struct sk_buff *skb)
1387 {
1388         struct sk_buff *skb2;
1389         const struct ipv6hdr *ip6h;
1390         u8 icmp6_type;
1391         u8 nexthdr;
1392         unsigned len;
1393         int offset;
1394         int err;
1395
1396         if (!pskb_may_pull(skb, sizeof(*ip6h)))
1397                 return -EINVAL;
1398
1399         ip6h = ipv6_hdr(skb);
1400
1401         /*
1402          * We're interested in MLD messages only.
1403          *  - Version is 6
1404          *  - MLD has always Router Alert hop-by-hop option
1405          *  - But we do not support jumbrograms.
1406          */
1407         if (ip6h->version != 6 ||
1408             ip6h->nexthdr != IPPROTO_HOPOPTS ||
1409             ip6h->payload_len == 0)
1410                 return 0;
1411
1412         len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1413         if (skb->len < len)
1414                 return -EINVAL;
1415
1416         nexthdr = ip6h->nexthdr;
1417         offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr);
1418
1419         if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1420                 return 0;
1421
1422         /* Okay, we found ICMPv6 header */
1423         skb2 = skb_clone(skb, GFP_ATOMIC);
1424         if (!skb2)
1425                 return -ENOMEM;
1426
1427         err = -EINVAL;
1428         if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1429                 goto out;
1430
1431         len -= offset - skb_network_offset(skb2);
1432
1433         __skb_pull(skb2, offset);
1434         skb_reset_transport_header(skb2);
1435         skb_postpull_rcsum(skb2, skb_network_header(skb2),
1436                            skb_network_header_len(skb2));
1437
1438         icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1439
1440         switch (icmp6_type) {
1441         case ICMPV6_MGM_QUERY:
1442         case ICMPV6_MGM_REPORT:
1443         case ICMPV6_MGM_REDUCTION:
1444         case ICMPV6_MLD2_REPORT:
1445                 break;
1446         default:
1447                 err = 0;
1448                 goto out;
1449         }
1450
1451         /* Okay, we found MLD message. Check further. */
1452         if (skb2->len > len) {
1453                 err = pskb_trim_rcsum(skb2, len);
1454                 if (err)
1455                         goto out;
1456                 err = -EINVAL;
1457         }
1458
1459         ip6h = ipv6_hdr(skb2);
1460
1461         switch (skb2->ip_summed) {
1462         case CHECKSUM_COMPLETE:
1463                 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1464                                         IPPROTO_ICMPV6, skb2->csum))
1465                         break;
1466                 /*FALLTHROUGH*/
1467         case CHECKSUM_NONE:
1468                 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1469                                                         &ip6h->daddr,
1470                                                         skb2->len,
1471                                                         IPPROTO_ICMPV6, 0));
1472                 if (__skb_checksum_complete(skb2))
1473                         goto out;
1474         }
1475
1476         err = 0;
1477
1478         BR_INPUT_SKB_CB(skb)->igmp = 1;
1479
1480         switch (icmp6_type) {
1481         case ICMPV6_MGM_REPORT:
1482             {
1483                 struct mld_msg *mld;
1484                 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1485                         err = -EINVAL;
1486                         goto out;
1487                 }
1488                 mld = (struct mld_msg *)skb_transport_header(skb2);
1489                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1490                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1491                 break;
1492             }
1493         case ICMPV6_MLD2_REPORT:
1494                 err = br_ip6_multicast_mld2_report(br, port, skb2);
1495                 break;
1496         case ICMPV6_MGM_QUERY:
1497                 err = br_ip6_multicast_query(br, port, skb2);
1498                 break;
1499         case ICMPV6_MGM_REDUCTION:
1500             {
1501                 struct mld_msg *mld;
1502                 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1503                         err = -EINVAL;
1504                         goto out;
1505                 }
1506                 mld = (struct mld_msg *)skb_transport_header(skb2);
1507                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1508             }
1509         }
1510
1511 out:
1512         kfree_skb(skb2);
1513         return err;
1514 }
1515 #endif
1516
1517 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1518                      struct sk_buff *skb)
1519 {
1520         BR_INPUT_SKB_CB(skb)->igmp = 0;
1521         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1522
1523         if (br->multicast_disabled)
1524                 return 0;
1525
1526         switch (skb->protocol) {
1527         case htons(ETH_P_IP):
1528                 return br_multicast_ipv4_rcv(br, port, skb);
1529 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1530         case htons(ETH_P_IPV6):
1531                 return br_multicast_ipv6_rcv(br, port, skb);
1532 #endif
1533         }
1534
1535         return 0;
1536 }
1537
1538 static void br_multicast_query_expired(unsigned long data)
1539 {
1540         struct net_bridge *br = (void *)data;
1541
1542         spin_lock(&br->multicast_lock);
1543         if (br->multicast_startup_queries_sent <
1544             br->multicast_startup_query_count)
1545                 br->multicast_startup_queries_sent++;
1546
1547         br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1548
1549         spin_unlock(&br->multicast_lock);
1550 }
1551
1552 void br_multicast_init(struct net_bridge *br)
1553 {
1554         br->hash_elasticity = 4;
1555         br->hash_max = 512;
1556
1557         br->multicast_router = 1;
1558         br->multicast_last_member_count = 2;
1559         br->multicast_startup_query_count = 2;
1560
1561         br->multicast_last_member_interval = HZ;
1562         br->multicast_query_response_interval = 10 * HZ;
1563         br->multicast_startup_query_interval = 125 * HZ / 4;
1564         br->multicast_query_interval = 125 * HZ;
1565         br->multicast_querier_interval = 255 * HZ;
1566         br->multicast_membership_interval = 260 * HZ;
1567
1568         spin_lock_init(&br->multicast_lock);
1569         setup_timer(&br->multicast_router_timer,
1570                     br_multicast_local_router_expired, 0);
1571         setup_timer(&br->multicast_querier_timer,
1572                     br_multicast_local_router_expired, 0);
1573         setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1574                     (unsigned long)br);
1575 }
1576
1577 void br_multicast_open(struct net_bridge *br)
1578 {
1579         br->multicast_startup_queries_sent = 0;
1580
1581         if (br->multicast_disabled)
1582                 return;
1583
1584         mod_timer(&br->multicast_query_timer, jiffies);
1585 }
1586
1587 void br_multicast_stop(struct net_bridge *br)
1588 {
1589         struct net_bridge_mdb_htable *mdb;
1590         struct net_bridge_mdb_entry *mp;
1591         struct hlist_node *p, *n;
1592         u32 ver;
1593         int i;
1594
1595         del_timer_sync(&br->multicast_router_timer);
1596         del_timer_sync(&br->multicast_querier_timer);
1597         del_timer_sync(&br->multicast_query_timer);
1598
1599         spin_lock_bh(&br->multicast_lock);
1600         mdb = mlock_dereference(br->mdb, br);
1601         if (!mdb)
1602                 goto out;
1603
1604         br->mdb = NULL;
1605
1606         ver = mdb->ver;
1607         for (i = 0; i < mdb->max; i++) {
1608                 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1609                                           hlist[ver]) {
1610                         del_timer(&mp->timer);
1611                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
1612                 }
1613         }
1614
1615         if (mdb->old) {
1616                 spin_unlock_bh(&br->multicast_lock);
1617                 rcu_barrier_bh();
1618                 spin_lock_bh(&br->multicast_lock);
1619                 WARN_ON(mdb->old);
1620         }
1621
1622         mdb->old = mdb;
1623         call_rcu_bh(&mdb->rcu, br_mdb_free);
1624
1625 out:
1626         spin_unlock_bh(&br->multicast_lock);
1627 }
1628
1629 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1630 {
1631         int err = -ENOENT;
1632
1633         spin_lock_bh(&br->multicast_lock);
1634         if (!netif_running(br->dev))
1635                 goto unlock;
1636
1637         switch (val) {
1638         case 0:
1639         case 2:
1640                 del_timer(&br->multicast_router_timer);
1641                 /* fall through */
1642         case 1:
1643                 br->multicast_router = val;
1644                 err = 0;
1645                 break;
1646
1647         default:
1648                 err = -EINVAL;
1649                 break;
1650         }
1651
1652 unlock:
1653         spin_unlock_bh(&br->multicast_lock);
1654
1655         return err;
1656 }
1657
1658 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1659 {
1660         struct net_bridge *br = p->br;
1661         int err = -ENOENT;
1662
1663         spin_lock(&br->multicast_lock);
1664         if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1665                 goto unlock;
1666
1667         switch (val) {
1668         case 0:
1669         case 1:
1670         case 2:
1671                 p->multicast_router = val;
1672                 err = 0;
1673
1674                 if (val < 2 && !hlist_unhashed(&p->rlist))
1675                         hlist_del_init_rcu(&p->rlist);
1676
1677                 if (val == 1)
1678                         break;
1679
1680                 del_timer(&p->multicast_router_timer);
1681
1682                 if (val == 0)
1683                         break;
1684
1685                 br_multicast_add_router(br, p);
1686                 break;
1687
1688         default:
1689                 err = -EINVAL;
1690                 break;
1691         }
1692
1693 unlock:
1694         spin_unlock(&br->multicast_lock);
1695
1696         return err;
1697 }
1698
1699 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1700 {
1701         struct net_bridge_port *port;
1702         int err = 0;
1703         struct net_bridge_mdb_htable *mdb;
1704
1705         spin_lock_bh(&br->multicast_lock);
1706         if (br->multicast_disabled == !val)
1707                 goto unlock;
1708
1709         br->multicast_disabled = !val;
1710         if (br->multicast_disabled)
1711                 goto unlock;
1712
1713         if (!netif_running(br->dev))
1714                 goto unlock;
1715
1716         mdb = mlock_dereference(br->mdb, br);
1717         if (mdb) {
1718                 if (mdb->old) {
1719                         err = -EEXIST;
1720 rollback:
1721                         br->multicast_disabled = !!val;
1722                         goto unlock;
1723                 }
1724
1725                 err = br_mdb_rehash(&br->mdb, mdb->max,
1726                                     br->hash_elasticity);
1727                 if (err)
1728                         goto rollback;
1729         }
1730
1731         br_multicast_open(br);
1732         list_for_each_entry(port, &br->port_list, list) {
1733                 if (port->state == BR_STATE_DISABLED ||
1734                     port->state == BR_STATE_BLOCKING)
1735                         continue;
1736
1737                 __br_multicast_enable_port(port);
1738         }
1739
1740 unlock:
1741         spin_unlock_bh(&br->multicast_lock);
1742
1743         return err;
1744 }
1745
1746 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1747 {
1748         int err = -ENOENT;
1749         u32 old;
1750         struct net_bridge_mdb_htable *mdb;
1751
1752         spin_lock_bh(&br->multicast_lock);
1753         if (!netif_running(br->dev))
1754                 goto unlock;
1755
1756         err = -EINVAL;
1757         if (!is_power_of_2(val))
1758                 goto unlock;
1759
1760         mdb = mlock_dereference(br->mdb, br);
1761         if (mdb && val < mdb->size)
1762                 goto unlock;
1763
1764         err = 0;
1765
1766         old = br->hash_max;
1767         br->hash_max = val;
1768
1769         if (mdb) {
1770                 if (mdb->old) {
1771                         err = -EEXIST;
1772 rollback:
1773                         br->hash_max = old;
1774                         goto unlock;
1775                 }
1776
1777                 err = br_mdb_rehash(&br->mdb, br->hash_max,
1778                                     br->hash_elasticity);
1779                 if (err)
1780                         goto rollback;
1781         }
1782
1783 unlock:
1784         spin_unlock_bh(&br->multicast_lock);
1785
1786         return err;
1787 }