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/export.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/igmp.h>
  17 #include <linux/jhash.h>
  18 #include <linux/kernel.h>
  19 #include <linux/log2.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/netfilter_bridge.h>
  22 #include <linux/random.h>
  23 #include <linux/rculist.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/slab.h>
  26 #include <linux/timer.h>
  27 #include <linux/inetdevice.h>
  28 #include <net/ip.h>
  29 #if IS_ENABLED(CONFIG_IPV6)
  30 #include <net/ipv6.h>
  31 #include <net/mld.h>
  32 #include <net/ip6_checksum.h>
  33 #include <net/addrconf.h>
  34 #endif
  35
  36 #include "br_private.h"
  37
  38 static void br_multicast_start_querier(struct net_bridge *br,
  39                                        struct bridge_mcast_own_query *query);
  40 static void br_multicast_add_router(struct net_bridge *br,
  41                                     struct net_bridge_port *port);
  42 static void br_ip4_multicast_leave_group(struct net_bridge *br,
  43                                          struct net_bridge_port *port,
  44                                          __be32 group,
  45                                          __u16 vid);
  46 #if IS_ENABLED(CONFIG_IPV6)
  47 static void br_ip6_multicast_leave_group(struct net_bridge *br,
  48                                          struct net_bridge_port *port,
  49                                          const struct in6_addr *group,
  50                                          __u16 vid);
  51 #endif
  52 unsigned int br_mdb_rehash_seq;
  53
  54 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
  55 {
  56         if (a->proto != b->proto)
  57                 return 0;
  58         if (a->vid != b->vid)
  59                 return 0;
  60         switch (a->proto) {
  61         case htons(ETH_P_IP):
  62                 return a->u.ip4 == b->u.ip4;
  63 #if IS_ENABLED(CONFIG_IPV6)
  64         case htons(ETH_P_IPV6):
  65                 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
  66 #endif
  67         }
  68         return 0;
  69 }
  70
  71 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
  72                                 __u16 vid)
  73 {
  74         return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
  75 }
  76
  77 #if IS_ENABLED(CONFIG_IPV6)
  78 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
  79                                 const struct in6_addr *ip,
  80                                 __u16 vid)
  81 {
  82         return jhash_2words(ipv6_addr_hash(ip), vid,
  83                             mdb->secret) & (mdb->max - 1);
  84 }
  85 #endif
  86
  87 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
  88                              struct br_ip *ip)
  89 {
  90         switch (ip->proto) {
  91         case htons(ETH_P_IP):
  92                 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
  93 #if IS_ENABLED(CONFIG_IPV6)
  94         case htons(ETH_P_IPV6):
  95                 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
  96 #endif
  97         }
  98         return 0;
  99 }
 100
 101 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
 102         struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
 103 {
 104         struct net_bridge_mdb_entry *mp;
 105
 106         hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 107                 if (br_ip_equal(&mp->addr, dst))
 108                         return mp;
 109         }
 110
 111         return NULL;
 112 }
 113
 114 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
 115                                            struct br_ip *dst)
 116 {
 117         if (!mdb)
 118                 return NULL;
 119
 120         return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
 121 }
 122
 123 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
 124         struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
 125 {
 126         struct br_ip br_dst;
 127
 128         br_dst.u.ip4 = dst;
 129         br_dst.proto = htons(ETH_P_IP);
 130         br_dst.vid = vid;
 131
 132         return br_mdb_ip_get(mdb, &br_dst);
 133 }
 134
 135 #if IS_ENABLED(CONFIG_IPV6)
 136 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
 137         struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
 138         __u16 vid)
 139 {
 140         struct br_ip br_dst;
 141
 142         br_dst.u.ip6 = *dst;
 143         br_dst.proto = htons(ETH_P_IPV6);
 144         br_dst.vid = vid;
 145
 146         return br_mdb_ip_get(mdb, &br_dst);
 147 }
 148 #endif
 149
 150 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 151                                         struct sk_buff *skb, u16 vid)
 152 {
 153         struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
 154         struct br_ip ip;
 155
 156         if (br->multicast_disabled)
 157                 return NULL;
 158
 159         if (BR_INPUT_SKB_CB(skb)->igmp)
 160                 return NULL;
 161
 162         ip.proto = skb->protocol;
 163         ip.vid = vid;
 164
 165         switch (skb->protocol) {
 166         case htons(ETH_P_IP):
 167                 ip.u.ip4 = ip_hdr(skb)->daddr;
 168                 break;
 169 #if IS_ENABLED(CONFIG_IPV6)
 170         case htons(ETH_P_IPV6):
 171                 ip.u.ip6 = ipv6_hdr(skb)->daddr;
 172                 break;
 173 #endif
 174         default:
 175                 return NULL;
 176         }
 177
 178         return br_mdb_ip_get(mdb, &ip);
 179 }
 180
 181 static void br_mdb_free(struct rcu_head *head)
 182 {
 183         struct net_bridge_mdb_htable *mdb =
 184                 container_of(head, struct net_bridge_mdb_htable, rcu);
 185         struct net_bridge_mdb_htable *old = mdb->old;
 186
 187         mdb->old = NULL;
 188         kfree(old->mhash);
 189         kfree(old);
 190 }
 191
 192 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
 193                        struct net_bridge_mdb_htable *old,
 194                        int elasticity)
 195 {
 196         struct net_bridge_mdb_entry *mp;
 197         int maxlen;
 198         int len;
 199         int i;
 200
 201         for (i = 0; i < old->max; i++)
 202                 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
 203                         hlist_add_head(&mp->hlist[new->ver],
 204                                        &new->mhash[br_ip_hash(new, &mp->addr)]);
 205
 206         if (!elasticity)
 207                 return 0;
 208
 209         maxlen = 0;
 210         for (i = 0; i < new->max; i++) {
 211                 len = 0;
 212                 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
 213                         len++;
 214                 if (len > maxlen)
 215                         maxlen = len;
 216         }
 217
 218         return maxlen > elasticity ? -EINVAL : 0;
 219 }
 220
 221 void br_multicast_free_pg(struct rcu_head *head)
 222 {
 223         struct net_bridge_port_group *p =
 224                 container_of(head, struct net_bridge_port_group, rcu);
 225
 226         kfree(p);
 227 }
 228
 229 static void br_multicast_free_group(struct rcu_head *head)
 230 {
 231         struct net_bridge_mdb_entry *mp =
 232                 container_of(head, struct net_bridge_mdb_entry, rcu);
 233
 234         kfree(mp);
 235 }
 236
 237 static void br_multicast_group_expired(unsigned long data)
 238 {
 239         struct net_bridge_mdb_entry *mp = (void *)data;
 240         struct net_bridge *br = mp->br;
 241         struct net_bridge_mdb_htable *mdb;
 242
 243         spin_lock(&br->multicast_lock);
 244         if (!netif_running(br->dev) || timer_pending(&mp->timer))
 245                 goto out;
 246
 247         mp->mglist = false;
 248
 249         if (mp->ports)
 250                 goto out;
 251
 252         mdb = mlock_dereference(br->mdb, br);
 253
 254         hlist_del_rcu(&mp->hlist[mdb->ver]);
 255         mdb->size--;
 256
 257         call_rcu_bh(&mp->rcu, br_multicast_free_group);
 258
 259 out:
 260         spin_unlock(&br->multicast_lock);
 261 }
 262
 263 static void br_multicast_del_pg(struct net_bridge *br,
 264                                 struct net_bridge_port_group *pg)
 265 {
 266         struct net_bridge_mdb_htable *mdb;
 267         struct net_bridge_mdb_entry *mp;
 268         struct net_bridge_port_group *p;
 269         struct net_bridge_port_group __rcu **pp;
 270
 271         mdb = mlock_dereference(br->mdb, br);
 272
 273         mp = br_mdb_ip_get(mdb, &pg->addr);
 274         if (WARN_ON(!mp))
 275                 return;
 276
 277         for (pp = &mp->ports;
 278              (p = mlock_dereference(*pp, br)) != NULL;
 279              pp = &p->next) {
 280                 if (p != pg)
 281                         continue;
 282
 283                 rcu_assign_pointer(*pp, p->next);
 284                 hlist_del_init(&p->mglist);
 285                 del_timer(&p->timer);
 286                 br_mdb_notify(br->dev, p, RTM_DELMDB);
 287                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
 288
 289                 if (!mp->ports && !mp->mglist &&
 290                     netif_running(br->dev))
 291                         mod_timer(&mp->timer, jiffies);
 292
 293                 return;
 294         }
 295
 296         WARN_ON(1);
 297 }
 298
 299 static void br_multicast_port_group_expired(unsigned long data)
 300 {
 301         struct net_bridge_port_group *pg = (void *)data;
 302         struct net_bridge *br = pg->port->br;
 303
 304         spin_lock(&br->multicast_lock);
 305         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
 306             hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
 307                 goto out;
 308
 309         br_multicast_del_pg(br, pg);
 310
 311 out:
 312         spin_unlock(&br->multicast_lock);
 313 }
 314
 315 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
 316                          int elasticity)
 317 {
 318         struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
 319         struct net_bridge_mdb_htable *mdb;
 320         int err;
 321
 322         mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
 323         if (!mdb)
 324                 return -ENOMEM;
 325
 326         mdb->max = max;
 327         mdb->old = old;
 328
 329         mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
 330         if (!mdb->mhash) {
 331                 kfree(mdb);
 332                 return -ENOMEM;
 333         }
 334
 335         mdb->size = old ? old->size : 0;
 336         mdb->ver = old ? old->ver ^ 1 : 0;
 337
 338         if (!old || elasticity)
 339                 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
 340         else
 341                 mdb->secret = old->secret;
 342
 343         if (!old)
 344                 goto out;
 345
 346         err = br_mdb_copy(mdb, old, elasticity);
 347         if (err) {
 348                 kfree(mdb->mhash);
 349                 kfree(mdb);
 350                 return err;
 351         }
 352
 353         br_mdb_rehash_seq++;
 354         call_rcu_bh(&mdb->rcu, br_mdb_free);
 355
 356 out:
 357         rcu_assign_pointer(*mdbp, mdb);
 358
 359         return 0;
 360 }
 361
 362 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
 363                                                     __be32 group)
 364 {
 365         struct sk_buff *skb;
 366         struct igmphdr *ih;
 367         struct ethhdr *eth;
 368         struct iphdr *iph;
 369
 370         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
 371                                                  sizeof(*ih) + 4);
 372         if (!skb)
 373                 goto out;
 374
 375         skb->protocol = htons(ETH_P_IP);
 376
 377         skb_reset_mac_header(skb);
 378         eth = eth_hdr(skb);
 379
 380         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 381         eth->h_dest[0] = 1;
 382         eth->h_dest[1] = 0;
 383         eth->h_dest[2] = 0x5e;
 384         eth->h_dest[3] = 0;
 385         eth->h_dest[4] = 0;
 386         eth->h_dest[5] = 1;
 387         eth->h_proto = htons(ETH_P_IP);
 388         skb_put(skb, sizeof(*eth));
 389
 390         skb_set_network_header(skb, skb->len);
 391         iph = ip_hdr(skb);
 392
 393         iph->version = 4;
 394         iph->ihl = 6;
 395         iph->tos = 0xc0;
 396         iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
 397         iph->id = 0;
 398         iph->frag_off = htons(IP_DF);
 399         iph->ttl = 1;
 400         iph->protocol = IPPROTO_IGMP;
 401         iph->saddr = br->multicast_query_use_ifaddr ?
 402                      inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
 403         iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 404         ((u8 *)&iph[1])[0] = IPOPT_RA;
 405         ((u8 *)&iph[1])[1] = 4;
 406         ((u8 *)&iph[1])[2] = 0;
 407         ((u8 *)&iph[1])[3] = 0;
 408         ip_send_check(iph);
 409         skb_put(skb, 24);
 410
 411         skb_set_transport_header(skb, skb->len);
 412         ih = igmp_hdr(skb);
 413         ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
 414         ih->code = (group ? br->multicast_last_member_interval :
 415                             br->multicast_query_response_interval) /
 416                    (HZ / IGMP_TIMER_SCALE);
 417         ih->group = group;
 418         ih->csum = 0;
 419         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 420         skb_put(skb, sizeof(*ih));
 421
 422         __skb_pull(skb, sizeof(*eth));
 423
 424 out:
 425         return skb;
 426 }
 427
 428 #if IS_ENABLED(CONFIG_IPV6)
 429 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
 430                                                     const struct in6_addr *group)
 431 {
 432         struct sk_buff *skb;
 433         struct ipv6hdr *ip6h;
 434         struct mld_msg *mldq;
 435         struct ethhdr *eth;
 436         u8 *hopopt;
 437         unsigned long interval;
 438
 439         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
 440                                                  8 + sizeof(*mldq));
 441         if (!skb)
 442                 goto out;
 443
 444         skb->protocol = htons(ETH_P_IPV6);
 445
 446         /* Ethernet header */
 447         skb_reset_mac_header(skb);
 448         eth = eth_hdr(skb);
 449
 450         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 451         eth->h_proto = htons(ETH_P_IPV6);
 452         skb_put(skb, sizeof(*eth));
 453
 454         /* IPv6 header + HbH option */
 455         skb_set_network_header(skb, skb->len);
 456         ip6h = ipv6_hdr(skb);
 457
 458         *(__force __be32 *)ip6h = htonl(0x60000000);
 459         ip6h->payload_len = htons(8 + sizeof(*mldq));
 460         ip6h->nexthdr = IPPROTO_HOPOPTS;
 461         ip6h->hop_limit = 1;
 462         ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
 463         if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
 464                                &ip6h->saddr)) {
 465                 kfree_skb(skb);
 466                 return NULL;
 467         }
 468         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 469
 470         hopopt = (u8 *)(ip6h + 1);
 471         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
 472         hopopt[1] = 0;                          /* length of HbH */
 473         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
 474         hopopt[3] = 2;                          /* Length of RA Option */
 475         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
 476         hopopt[5] = 0;
 477         hopopt[6] = IPV6_TLV_PAD1;              /* Pad1 */
 478         hopopt[7] = IPV6_TLV_PAD1;              /* Pad1 */
 479
 480         skb_put(skb, sizeof(*ip6h) + 8);
 481
 482         /* ICMPv6 */
 483         skb_set_transport_header(skb, skb->len);
 484         mldq = (struct mld_msg *) icmp6_hdr(skb);
 485
 486         interval = ipv6_addr_any(group) ?
 487                         br->multicast_query_response_interval :
 488                         br->multicast_last_member_interval;
 489
 490         mldq->mld_type = ICMPV6_MGM_QUERY;
 491         mldq->mld_code = 0;
 492         mldq->mld_cksum = 0;
 493         mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
 494         mldq->mld_reserved = 0;
 495         mldq->mld_mca = *group;
 496
 497         /* checksum */
 498         mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 499                                           sizeof(*mldq), IPPROTO_ICMPV6,
 500                                           csum_partial(mldq,
 501                                                        sizeof(*mldq), 0));
 502         skb_put(skb, sizeof(*mldq));
 503
 504         __skb_pull(skb, sizeof(*eth));
 505
 506 out:
 507         return skb;
 508 }
 509 #endif
 510
 511 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 512                                                 struct br_ip *addr)
 513 {
 514         switch (addr->proto) {
 515         case htons(ETH_P_IP):
 516                 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
 517 #if IS_ENABLED(CONFIG_IPV6)
 518         case htons(ETH_P_IPV6):
 519                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
 520 #endif
 521         }
 522         return NULL;
 523 }
 524
 525 static struct net_bridge_mdb_entry *br_multicast_get_group(
 526         struct net_bridge *br, struct net_bridge_port *port,
 527         struct br_ip *group, int hash)
 528 {
 529         struct net_bridge_mdb_htable *mdb;
 530         struct net_bridge_mdb_entry *mp;
 531         unsigned int count = 0;
 532         unsigned int max;
 533         int elasticity;
 534         int err;
 535
 536         mdb = rcu_dereference_protected(br->mdb, 1);
 537         hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 538                 count++;
 539                 if (unlikely(br_ip_equal(group, &mp->addr)))
 540                         return mp;
 541         }
 542
 543         elasticity = 0;
 544         max = mdb->max;
 545
 546         if (unlikely(count > br->hash_elasticity && count)) {
 547                 if (net_ratelimit())
 548                         br_info(br, "Multicast hash table "
 549                                 "chain limit reached: %s\n",
 550                                 port ? port->dev->name : br->dev->name);
 551
 552                 elasticity = br->hash_elasticity;
 553         }
 554
 555         if (mdb->size >= max) {
 556                 max *= 2;
 557                 if (unlikely(max > br->hash_max)) {
 558                         br_warn(br, "Multicast hash table maximum of %d "
 559                                 "reached, disabling snooping: %s\n",
 560                                 br->hash_max,
 561                                 port ? port->dev->name : br->dev->name);
 562                         err = -E2BIG;
 563 disable:
 564                         br->multicast_disabled = 1;
 565                         goto err;
 566                 }
 567         }
 568
 569         if (max > mdb->max || elasticity) {
 570                 if (mdb->old) {
 571                         if (net_ratelimit())
 572                                 br_info(br, "Multicast hash table "
 573                                         "on fire: %s\n",
 574                                         port ? port->dev->name : br->dev->name);
 575                         err = -EEXIST;
 576                         goto err;
 577                 }
 578
 579                 err = br_mdb_rehash(&br->mdb, max, elasticity);
 580                 if (err) {
 581                         br_warn(br, "Cannot rehash multicast "
 582                                 "hash table, disabling snooping: %s, %d, %d\n",
 583                                 port ? port->dev->name : br->dev->name,
 584                                 mdb->size, err);
 585                         goto disable;
 586                 }
 587
 588                 err = -EAGAIN;
 589                 goto err;
 590         }
 591
 592         return NULL;
 593
 594 err:
 595         mp = ERR_PTR(err);
 596         return mp;
 597 }
 598
 599 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 600         struct net_bridge_port *port, struct br_ip *group)
 601 {
 602         struct net_bridge_mdb_htable *mdb;
 603         struct net_bridge_mdb_entry *mp;
 604         int hash;
 605         int err;
 606
 607         mdb = rcu_dereference_protected(br->mdb, 1);
 608         if (!mdb) {
 609                 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
 610                 if (err)
 611                         return ERR_PTR(err);
 612                 goto rehash;
 613         }
 614
 615         hash = br_ip_hash(mdb, group);
 616         mp = br_multicast_get_group(br, port, group, hash);
 617         switch (PTR_ERR(mp)) {
 618         case 0:
 619                 break;
 620
 621         case -EAGAIN:
 622 rehash:
 623                 mdb = rcu_dereference_protected(br->mdb, 1);
 624                 hash = br_ip_hash(mdb, group);
 625                 break;
 626
 627         default:
 628                 goto out;
 629         }
 630
 631         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 632         if (unlikely(!mp))
 633                 return ERR_PTR(-ENOMEM);
 634
 635         mp->br = br;
 636         mp->addr = *group;
 637         setup_timer(&mp->timer, br_multicast_group_expired,
 638                     (unsigned long)mp);
 639
 640         hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
 641         mdb->size++;
 642
 643 out:
 644         return mp;
 645 }
 646
 647 struct net_bridge_port_group *br_multicast_new_port_group(
 648                         struct net_bridge_port *port,
 649                         struct br_ip *group,
 650                         struct net_bridge_port_group __rcu *next,
 651                         unsigned char flags)
 652 {
 653         struct net_bridge_port_group *p;
 654
 655         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 656         if (unlikely(!p))
 657                 return NULL;
 658
 659         p->addr = *group;
 660         p->port = port;
 661         p->flags = flags;
 662         rcu_assign_pointer(p->next, next);
 663         hlist_add_head(&p->mglist, &port->mglist);
 664         setup_timer(&p->timer, br_multicast_port_group_expired,
 665                     (unsigned long)p);
 666         return p;
 667 }
 668
 669 static int br_multicast_add_group(struct net_bridge *br,
 670                                   struct net_bridge_port *port,
 671                                   struct br_ip *group)
 672 {
 673         struct net_bridge_mdb_entry *mp;
 674         struct net_bridge_port_group *p;
 675         struct net_bridge_port_group __rcu **pp;
 676         unsigned long now = jiffies;
 677         int err;
 678
 679         spin_lock(&br->multicast_lock);
 680         if (!netif_running(br->dev) ||
 681             (port && port->state == BR_STATE_DISABLED))
 682                 goto out;
 683
 684         mp = br_multicast_new_group(br, port, group);
 685         err = PTR_ERR(mp);
 686         if (IS_ERR(mp))
 687                 goto err;
 688
 689         if (!port) {
 690                 mp->mglist = true;
 691                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
 692                 goto out;
 693         }
 694
 695         for (pp = &mp->ports;
 696              (p = mlock_dereference(*pp, br)) != NULL;
 697              pp = &p->next) {
 698                 if (p->port == port)
 699                         goto found;
 700                 if ((unsigned long)p->port < (unsigned long)port)
 701                         break;
 702         }
 703
 704         p = br_multicast_new_port_group(port, group, *pp, 0);
 705         if (unlikely(!p))
 706                 goto err;
 707         rcu_assign_pointer(*pp, p);
 708         br_mdb_notify(br->dev, p, RTM_NEWMDB);
 709
 710 found:
 711         mod_timer(&p->timer, now + br->multicast_membership_interval);
 712 out:
 713         err = 0;
 714
 715 err:
 716         spin_unlock(&br->multicast_lock);
 717         return err;
 718 }
 719
 720 static int br_ip4_multicast_add_group(struct net_bridge *br,
 721                                       struct net_bridge_port *port,
 722                                       __be32 group,
 723                                       __u16 vid)
 724 {
 725         struct br_ip br_group;
 726
 727         if (ipv4_is_local_multicast(group))
 728                 return 0;
 729
 730         br_group.u.ip4 = group;
 731         br_group.proto = htons(ETH_P_IP);
 732         br_group.vid = vid;
 733
 734         return br_multicast_add_group(br, port, &br_group);
 735 }
 736
 737 #if IS_ENABLED(CONFIG_IPV6)
 738 static int br_ip6_multicast_add_group(struct net_bridge *br,
 739                                       struct net_bridge_port *port,
 740                                       const struct in6_addr *group,
 741                                       __u16 vid)
 742 {
 743         struct br_ip br_group;
 744
 745         if (ipv6_addr_is_ll_all_nodes(group))
 746                 return 0;
 747
 748         br_group.u.ip6 = *group;
 749         br_group.proto = htons(ETH_P_IPV6);
 750         br_group.vid = vid;
 751
 752         return br_multicast_add_group(br, port, &br_group);
 753 }
 754 #endif
 755
 756 static void br_multicast_router_expired(unsigned long data)
 757 {
 758         struct net_bridge_port *port = (void *)data;
 759         struct net_bridge *br = port->br;
 760
 761         spin_lock(&br->multicast_lock);
 762         if (port->multicast_router != 1 ||
 763             timer_pending(&port->multicast_router_timer) ||
 764             hlist_unhashed(&port->rlist))
 765                 goto out;
 766
 767         hlist_del_init_rcu(&port->rlist);
 768         br_rtr_notify(br->dev, port, RTM_DELMDB);
 769
 770 out:
 771         spin_unlock(&br->multicast_lock);
 772 }
 773
 774 static void br_multicast_local_router_expired(unsigned long data)
 775 {
 776 }
 777
 778 static void br_multicast_querier_expired(struct net_bridge *br,
 779                                          struct bridge_mcast_own_query *query)
 780 {
 781         spin_lock(&br->multicast_lock);
 782         if (!netif_running(br->dev) || br->multicast_disabled)
 783                 goto out;
 784
 785         br_multicast_start_querier(br, query);
 786
 787 out:
 788         spin_unlock(&br->multicast_lock);
 789 }
 790
 791 static void br_ip4_multicast_querier_expired(unsigned long data)
 792 {
 793         struct net_bridge *br = (void *)data;
 794
 795         br_multicast_querier_expired(br, &br->ip4_own_query);
 796 }
 797
 798 #if IS_ENABLED(CONFIG_IPV6)
 799 static void br_ip6_multicast_querier_expired(unsigned long data)
 800 {
 801         struct net_bridge *br = (void *)data;
 802
 803         br_multicast_querier_expired(br, &br->ip6_own_query);
 804 }
 805 #endif
 806
 807 static void br_multicast_select_own_querier(struct net_bridge *br,
 808                                             struct br_ip *ip,
 809                                             struct sk_buff *skb)
 810 {
 811         if (ip->proto == htons(ETH_P_IP))
 812                 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
 813 #if IS_ENABLED(CONFIG_IPV6)
 814         else
 815                 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
 816 #endif
 817 }
 818
 819 static void __br_multicast_send_query(struct net_bridge *br,
 820                                       struct net_bridge_port *port,
 821                                       struct br_ip *ip)
 822 {
 823         struct sk_buff *skb;
 824
 825         skb = br_multicast_alloc_query(br, ip);
 826         if (!skb)
 827                 return;
 828
 829         if (port) {
 830                 skb->dev = port->dev;
 831                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
 832                         dev_net(port->dev), NULL, skb, NULL, skb->dev,
 833                         br_dev_queue_push_xmit);
 834         } else {
 835                 br_multicast_select_own_querier(br, ip, skb);
 836                 netif_rx(skb);
 837         }
 838 }
 839
 840 static void br_multicast_send_query(struct net_bridge *br,
 841                                     struct net_bridge_port *port,
 842                                     struct bridge_mcast_own_query *own_query)
 843 {
 844         unsigned long time;
 845         struct br_ip br_group;
 846         struct bridge_mcast_other_query *other_query = NULL;
 847
 848         if (!netif_running(br->dev) || br->multicast_disabled ||
 849             !br->multicast_querier)
 850                 return;
 851
 852         memset(&br_group.u, 0, sizeof(br_group.u));
 853
 854         if (port ? (own_query == &port->ip4_own_query) :
 855                    (own_query == &br->ip4_own_query)) {
 856                 other_query = &br->ip4_other_query;
 857                 br_group.proto = htons(ETH_P_IP);
 858 #if IS_ENABLED(CONFIG_IPV6)
 859         } else {
 860                 other_query = &br->ip6_other_query;
 861                 br_group.proto = htons(ETH_P_IPV6);
 862 #endif
 863         }
 864
 865         if (!other_query || timer_pending(&other_query->timer))
 866                 return;
 867
 868         __br_multicast_send_query(br, port, &br_group);
 869
 870         time = jiffies;
 871         time += own_query->startup_sent < br->multicast_startup_query_count ?
 872                 br->multicast_startup_query_interval :
 873                 br->multicast_query_interval;
 874         mod_timer(&own_query->timer, time);
 875 }
 876
 877 static void
 878 br_multicast_port_query_expired(struct net_bridge_port *port,
 879                                 struct bridge_mcast_own_query *query)
 880 {
 881         struct net_bridge *br = port->br;
 882
 883         spin_lock(&br->multicast_lock);
 884         if (port->state == BR_STATE_DISABLED ||
 885             port->state == BR_STATE_BLOCKING)
 886                 goto out;
 887
 888         if (query->startup_sent < br->multicast_startup_query_count)
 889                 query->startup_sent++;
 890
 891         br_multicast_send_query(port->br, port, query);
 892
 893 out:
 894         spin_unlock(&br->multicast_lock);
 895 }
 896
 897 static void br_ip4_multicast_port_query_expired(unsigned long data)
 898 {
 899         struct net_bridge_port *port = (void *)data;
 900
 901         br_multicast_port_query_expired(port, &port->ip4_own_query);
 902 }
 903
 904 #if IS_ENABLED(CONFIG_IPV6)
 905 static void br_ip6_multicast_port_query_expired(unsigned long data)
 906 {
 907         struct net_bridge_port *port = (void *)data;
 908
 909         br_multicast_port_query_expired(port, &port->ip6_own_query);
 910 }
 911 #endif
 912
 913 void br_multicast_add_port(struct net_bridge_port *port)
 914 {
 915         port->multicast_router = 1;
 916
 917         setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
 918                     (unsigned long)port);
 919         setup_timer(&port->ip4_own_query.timer,
 920                     br_ip4_multicast_port_query_expired, (unsigned long)port);
 921 #if IS_ENABLED(CONFIG_IPV6)
 922         setup_timer(&port->ip6_own_query.timer,
 923                     br_ip6_multicast_port_query_expired, (unsigned long)port);
 924 #endif
 925 }
 926
 927 void br_multicast_del_port(struct net_bridge_port *port)
 928 {
 929         struct net_bridge *br = port->br;
 930         struct net_bridge_port_group *pg;
 931         struct hlist_node *n;
 932
 933         /* Take care of the remaining groups, only perm ones should be left */
 934         spin_lock_bh(&br->multicast_lock);
 935         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 936                 br_multicast_del_pg(br, pg);
 937         spin_unlock_bh(&br->multicast_lock);
 938         del_timer_sync(&port->multicast_router_timer);
 939 }
 940
 941 static void br_multicast_enable(struct bridge_mcast_own_query *query)
 942 {
 943         query->startup_sent = 0;
 944
 945         if (try_to_del_timer_sync(&query->timer) >= 0 ||
 946             del_timer(&query->timer))
 947                 mod_timer(&query->timer, jiffies);
 948 }
 949
 950 void br_multicast_enable_port(struct net_bridge_port *port)
 951 {
 952         struct net_bridge *br = port->br;
 953
 954         spin_lock(&br->multicast_lock);
 955         if (br->multicast_disabled || !netif_running(br->dev))
 956                 goto out;
 957
 958         br_multicast_enable(&port->ip4_own_query);
 959 #if IS_ENABLED(CONFIG_IPV6)
 960         br_multicast_enable(&port->ip6_own_query);
 961 #endif
 962         if (port->multicast_router == 2 && hlist_unhashed(&port->rlist))
 963                 br_multicast_add_router(br, port);
 964
 965 out:
 966         spin_unlock(&br->multicast_lock);
 967 }
 968
 969 void br_multicast_disable_port(struct net_bridge_port *port)
 970 {
 971         struct net_bridge *br = port->br;
 972         struct net_bridge_port_group *pg;
 973         struct hlist_node *n;
 974
 975         spin_lock(&br->multicast_lock);
 976         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 977                 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
 978                         br_multicast_del_pg(br, pg);
 979
 980         if (!hlist_unhashed(&port->rlist)) {
 981                 hlist_del_init_rcu(&port->rlist);
 982                 br_rtr_notify(br->dev, port, RTM_DELMDB);
 983         }
 984         del_timer(&port->multicast_router_timer);
 985         del_timer(&port->ip4_own_query.timer);
 986 #if IS_ENABLED(CONFIG_IPV6)
 987         del_timer(&port->ip6_own_query.timer);
 988 #endif
 989         spin_unlock(&br->multicast_lock);
 990 }
 991
 992 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
 993                                          struct net_bridge_port *port,
 994                                          struct sk_buff *skb,
 995                                          u16 vid)
 996 {
 997         struct igmpv3_report *ih;
 998         struct igmpv3_grec *grec;
 999         int i;
1000         int len;
1001         int num;
1002         int type;
1003         int err = 0;
1004         __be32 group;
1005
1006         ih = igmpv3_report_hdr(skb);
1007         num = ntohs(ih->ngrec);
1008         len = skb_transport_offset(skb) + sizeof(*ih);
1009
1010         for (i = 0; i < num; i++) {
1011                 len += sizeof(*grec);
1012                 if (!pskb_may_pull(skb, len))
1013                         return -EINVAL;
1014
1015                 grec = (void *)(skb->data + len - sizeof(*grec));
1016                 group = grec->grec_mca;
1017                 type = grec->grec_type;
1018
1019                 len += ntohs(grec->grec_nsrcs) * 4;
1020                 if (!pskb_may_pull(skb, len))
1021                         return -EINVAL;
1022
1023                 /* We treat this as an IGMPv2 report for now. */
1024                 switch (type) {
1025                 case IGMPV3_MODE_IS_INCLUDE:
1026                 case IGMPV3_MODE_IS_EXCLUDE:
1027                 case IGMPV3_CHANGE_TO_INCLUDE:
1028                 case IGMPV3_CHANGE_TO_EXCLUDE:
1029                 case IGMPV3_ALLOW_NEW_SOURCES:
1030                 case IGMPV3_BLOCK_OLD_SOURCES:
1031                         break;
1032
1033                 default:
1034                         continue;
1035                 }
1036
1037                 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1038                      type == IGMPV3_MODE_IS_INCLUDE) &&
1039                     ntohs(grec->grec_nsrcs) == 0) {
1040                         br_ip4_multicast_leave_group(br, port, group, vid);
1041                 } else {
1042                         err = br_ip4_multicast_add_group(br, port, group, vid);
1043                         if (err)
1044                                 break;
1045                 }
1046         }
1047
1048         return err;
1049 }
1050
1051 #if IS_ENABLED(CONFIG_IPV6)
1052 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1053                                         struct net_bridge_port *port,
1054                                         struct sk_buff *skb,
1055                                         u16 vid)
1056 {
1057         struct icmp6hdr *icmp6h;
1058         struct mld2_grec *grec;
1059         int i;
1060         int len;
1061         int num;
1062         int err = 0;
1063
1064         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1065                 return -EINVAL;
1066
1067         icmp6h = icmp6_hdr(skb);
1068         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1069         len = skb_transport_offset(skb) + sizeof(*icmp6h);
1070
1071         for (i = 0; i < num; i++) {
1072                 __be16 *nsrcs, _nsrcs;
1073
1074                 nsrcs = skb_header_pointer(skb,
1075                                            len + offsetof(struct mld2_grec,
1076                                                           grec_nsrcs),
1077                                            sizeof(_nsrcs), &_nsrcs);
1078                 if (!nsrcs)
1079                         return -EINVAL;
1080
1081                 if (!pskb_may_pull(skb,
1082                                    len + sizeof(*grec) +
1083                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
1084                         return -EINVAL;
1085
1086                 grec = (struct mld2_grec *)(skb->data + len);
1087                 len += sizeof(*grec) +
1088                        sizeof(struct in6_addr) * ntohs(*nsrcs);
1089
1090                 /* We treat these as MLDv1 reports for now. */
1091                 switch (grec->grec_type) {
1092                 case MLD2_MODE_IS_INCLUDE:
1093                 case MLD2_MODE_IS_EXCLUDE:
1094                 case MLD2_CHANGE_TO_INCLUDE:
1095                 case MLD2_CHANGE_TO_EXCLUDE:
1096                 case MLD2_ALLOW_NEW_SOURCES:
1097                 case MLD2_BLOCK_OLD_SOURCES:
1098                         break;
1099
1100                 default:
1101                         continue;
1102                 }
1103
1104                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1105                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1106                     ntohs(*nsrcs) == 0) {
1107                         br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1108                                                      vid);
1109                 } else {
1110                         err = br_ip6_multicast_add_group(br, port,
1111                                                          &grec->grec_mca, vid);
1112                         if (!err)
1113                                 break;
1114                 }
1115         }
1116
1117         return err;
1118 }
1119 #endif
1120
1121 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1122                                             struct net_bridge_port *port,
1123                                             __be32 saddr)
1124 {
1125         if (!timer_pending(&br->ip4_own_query.timer) &&
1126             !timer_pending(&br->ip4_other_query.timer))
1127                 goto update;
1128
1129         if (!br->ip4_querier.addr.u.ip4)
1130                 goto update;
1131
1132         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1133                 goto update;
1134
1135         return false;
1136
1137 update:
1138         br->ip4_querier.addr.u.ip4 = saddr;
1139
1140         /* update protected by general multicast_lock by caller */
1141         rcu_assign_pointer(br->ip4_querier.port, port);
1142
1143         return true;
1144 }
1145
1146 #if IS_ENABLED(CONFIG_IPV6)
1147 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1148                                             struct net_bridge_port *port,
1149                                             struct in6_addr *saddr)
1150 {
1151         if (!timer_pending(&br->ip6_own_query.timer) &&
1152             !timer_pending(&br->ip6_other_query.timer))
1153                 goto update;
1154
1155         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1156                 goto update;
1157
1158         return false;
1159
1160 update:
1161         br->ip6_querier.addr.u.ip6 = *saddr;
1162
1163         /* update protected by general multicast_lock by caller */
1164         rcu_assign_pointer(br->ip6_querier.port, port);
1165
1166         return true;
1167 }
1168 #endif
1169
1170 static bool br_multicast_select_querier(struct net_bridge *br,
1171                                         struct net_bridge_port *port,
1172                                         struct br_ip *saddr)
1173 {
1174         switch (saddr->proto) {
1175         case htons(ETH_P_IP):
1176                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1177 #if IS_ENABLED(CONFIG_IPV6)
1178         case htons(ETH_P_IPV6):
1179                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1180 #endif
1181         }
1182
1183         return false;
1184 }
1185
1186 static void
1187 br_multicast_update_query_timer(struct net_bridge *br,
1188                                 struct bridge_mcast_other_query *query,
1189                                 unsigned long max_delay)
1190 {
1191         if (!timer_pending(&query->timer))
1192                 query->delay_time = jiffies + max_delay;
1193
1194         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1195 }
1196
1197 /*
1198  * Add port to router_list
1199  *  list is maintained ordered by pointer value
1200  *  and locked by br->multicast_lock and RCU
1201  */
1202 static void br_multicast_add_router(struct net_bridge *br,
1203                                     struct net_bridge_port *port)
1204 {
1205         struct net_bridge_port *p;
1206         struct hlist_node *slot = NULL;
1207
1208         if (!hlist_unhashed(&port->rlist))
1209                 return;
1210
1211         hlist_for_each_entry(p, &br->router_list, rlist) {
1212                 if ((unsigned long) port >= (unsigned long) p)
1213                         break;
1214                 slot = &p->rlist;
1215         }
1216
1217         if (slot)
1218                 hlist_add_behind_rcu(&port->rlist, slot);
1219         else
1220                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1221         br_rtr_notify(br->dev, port, RTM_NEWMDB);
1222 }
1223
1224 static void br_multicast_mark_router(struct net_bridge *br,
1225                                      struct net_bridge_port *port)
1226 {
1227         unsigned long now = jiffies;
1228
1229         if (!port) {
1230                 if (br->multicast_router == 1)
1231                         mod_timer(&br->multicast_router_timer,
1232                                   now + br->multicast_querier_interval);
1233                 return;
1234         }
1235
1236         if (port->multicast_router != 1)
1237                 return;
1238
1239         br_multicast_add_router(br, port);
1240
1241         mod_timer(&port->multicast_router_timer,
1242                   now + br->multicast_querier_interval);
1243 }
1244
1245 static void br_multicast_query_received(struct net_bridge *br,
1246                                         struct net_bridge_port *port,
1247                                         struct bridge_mcast_other_query *query,
1248                                         struct br_ip *saddr,
1249                                         unsigned long max_delay)
1250 {
1251         if (!br_multicast_select_querier(br, port, saddr))
1252                 return;
1253
1254         br_multicast_update_query_timer(br, query, max_delay);
1255         br_multicast_mark_router(br, port);
1256 }
1257
1258 static int br_ip4_multicast_query(struct net_bridge *br,
1259                                   struct net_bridge_port *port,
1260                                   struct sk_buff *skb,
1261                                   u16 vid)
1262 {
1263         const struct iphdr *iph = ip_hdr(skb);
1264         struct igmphdr *ih = igmp_hdr(skb);
1265         struct net_bridge_mdb_entry *mp;
1266         struct igmpv3_query *ih3;
1267         struct net_bridge_port_group *p;
1268         struct net_bridge_port_group __rcu **pp;
1269         struct br_ip saddr;
1270         unsigned long max_delay;
1271         unsigned long now = jiffies;
1272         __be32 group;
1273         int err = 0;
1274
1275         spin_lock(&br->multicast_lock);
1276         if (!netif_running(br->dev) ||
1277             (port && port->state == BR_STATE_DISABLED))
1278                 goto out;
1279
1280         group = ih->group;
1281
1282         if (skb->len == sizeof(*ih)) {
1283                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1284
1285                 if (!max_delay) {
1286                         max_delay = 10 * HZ;
1287                         group = 0;
1288                 }
1289         } else if (skb->len >= sizeof(*ih3)) {
1290                 ih3 = igmpv3_query_hdr(skb);
1291                 if (ih3->nsrcs)
1292                         goto out;
1293
1294                 max_delay = ih3->code ?
1295                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1296         } else {
1297                 goto out;
1298         }
1299
1300         if (!group) {
1301                 saddr.proto = htons(ETH_P_IP);
1302                 saddr.u.ip4 = iph->saddr;
1303
1304                 br_multicast_query_received(br, port, &br->ip4_other_query,
1305                                             &saddr, max_delay);
1306                 goto out;
1307         }
1308
1309         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1310         if (!mp)
1311                 goto out;
1312
1313         max_delay *= br->multicast_last_member_count;
1314
1315         if (mp->mglist &&
1316             (timer_pending(&mp->timer) ?
1317              time_after(mp->timer.expires, now + max_delay) :
1318              try_to_del_timer_sync(&mp->timer) >= 0))
1319                 mod_timer(&mp->timer, now + max_delay);
1320
1321         for (pp = &mp->ports;
1322              (p = mlock_dereference(*pp, br)) != NULL;
1323              pp = &p->next) {
1324                 if (timer_pending(&p->timer) ?
1325                     time_after(p->timer.expires, now + max_delay) :
1326                     try_to_del_timer_sync(&p->timer) >= 0)
1327                         mod_timer(&p->timer, now + max_delay);
1328         }
1329
1330 out:
1331         spin_unlock(&br->multicast_lock);
1332         return err;
1333 }
1334
1335 #if IS_ENABLED(CONFIG_IPV6)
1336 static int br_ip6_multicast_query(struct net_bridge *br,
1337                                   struct net_bridge_port *port,
1338                                   struct sk_buff *skb,
1339                                   u16 vid)
1340 {
1341         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1342         struct mld_msg *mld;
1343         struct net_bridge_mdb_entry *mp;
1344         struct mld2_query *mld2q;
1345         struct net_bridge_port_group *p;
1346         struct net_bridge_port_group __rcu **pp;
1347         struct br_ip saddr;
1348         unsigned long max_delay;
1349         unsigned long now = jiffies;
1350         const struct in6_addr *group = NULL;
1351         bool is_general_query;
1352         int err = 0;
1353
1354         spin_lock(&br->multicast_lock);
1355         if (!netif_running(br->dev) ||
1356             (port && port->state == BR_STATE_DISABLED))
1357                 goto out;
1358
1359         if (skb->len == sizeof(*mld)) {
1360                 if (!pskb_may_pull(skb, sizeof(*mld))) {
1361                         err = -EINVAL;
1362                         goto out;
1363                 }
1364                 mld = (struct mld_msg *) icmp6_hdr(skb);
1365                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1366                 if (max_delay)
1367                         group = &mld->mld_mca;
1368         } else {
1369                 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1370                         err = -EINVAL;
1371                         goto out;
1372                 }
1373                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1374                 if (!mld2q->mld2q_nsrcs)
1375                         group = &mld2q->mld2q_mca;
1376
1377                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1378         }
1379
1380         is_general_query = group && ipv6_addr_any(group);
1381
1382         if (is_general_query) {
1383                 saddr.proto = htons(ETH_P_IPV6);
1384                 saddr.u.ip6 = ip6h->saddr;
1385
1386                 br_multicast_query_received(br, port, &br->ip6_other_query,
1387                                             &saddr, max_delay);
1388                 goto out;
1389         } else if (!group) {
1390                 goto out;
1391         }
1392
1393         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1394         if (!mp)
1395                 goto out;
1396
1397         max_delay *= br->multicast_last_member_count;
1398         if (mp->mglist &&
1399             (timer_pending(&mp->timer) ?
1400              time_after(mp->timer.expires, now + max_delay) :
1401              try_to_del_timer_sync(&mp->timer) >= 0))
1402                 mod_timer(&mp->timer, now + max_delay);
1403
1404         for (pp = &mp->ports;
1405              (p = mlock_dereference(*pp, br)) != NULL;
1406              pp = &p->next) {
1407                 if (timer_pending(&p->timer) ?
1408                     time_after(p->timer.expires, now + max_delay) :
1409                     try_to_del_timer_sync(&p->timer) >= 0)
1410                         mod_timer(&p->timer, now + max_delay);
1411         }
1412
1413 out:
1414         spin_unlock(&br->multicast_lock);
1415         return err;
1416 }
1417 #endif
1418
1419 static void
1420 br_multicast_leave_group(struct net_bridge *br,
1421                          struct net_bridge_port *port,
1422                          struct br_ip *group,
1423                          struct bridge_mcast_other_query *other_query,
1424                          struct bridge_mcast_own_query *own_query)
1425 {
1426         struct net_bridge_mdb_htable *mdb;
1427         struct net_bridge_mdb_entry *mp;
1428         struct net_bridge_port_group *p;
1429         unsigned long now;
1430         unsigned long time;
1431
1432         spin_lock(&br->multicast_lock);
1433         if (!netif_running(br->dev) ||
1434             (port && port->state == BR_STATE_DISABLED))
1435                 goto out;
1436
1437         mdb = mlock_dereference(br->mdb, br);
1438         mp = br_mdb_ip_get(mdb, group);
1439         if (!mp)
1440                 goto out;
1441
1442         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1443                 struct net_bridge_port_group __rcu **pp;
1444
1445                 for (pp = &mp->ports;
1446                      (p = mlock_dereference(*pp, br)) != NULL;
1447                      pp = &p->next) {
1448                         if (p->port != port)
1449                                 continue;
1450
1451                         rcu_assign_pointer(*pp, p->next);
1452                         hlist_del_init(&p->mglist);
1453                         del_timer(&p->timer);
1454                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1455                         br_mdb_notify(br->dev, p, RTM_DELMDB);
1456
1457                         if (!mp->ports && !mp->mglist &&
1458                             netif_running(br->dev))
1459                                 mod_timer(&mp->timer, jiffies);
1460                 }
1461                 goto out;
1462         }
1463
1464         if (timer_pending(&other_query->timer))
1465                 goto out;
1466
1467         if (br->multicast_querier) {
1468                 __br_multicast_send_query(br, port, &mp->addr);
1469
1470                 time = jiffies + br->multicast_last_member_count *
1471                                  br->multicast_last_member_interval;
1472
1473                 mod_timer(&own_query->timer, time);
1474
1475                 for (p = mlock_dereference(mp->ports, br);
1476                      p != NULL;
1477                      p = mlock_dereference(p->next, br)) {
1478                         if (p->port != port)
1479                                 continue;
1480
1481                         if (!hlist_unhashed(&p->mglist) &&
1482                             (timer_pending(&p->timer) ?
1483                              time_after(p->timer.expires, time) :
1484                              try_to_del_timer_sync(&p->timer) >= 0)) {
1485                                 mod_timer(&p->timer, time);
1486                         }
1487
1488                         break;
1489                 }
1490         }
1491
1492         now = jiffies;
1493         time = now + br->multicast_last_member_count *
1494                      br->multicast_last_member_interval;
1495
1496         if (!port) {
1497                 if (mp->mglist &&
1498                     (timer_pending(&mp->timer) ?
1499                      time_after(mp->timer.expires, time) :
1500                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1501                         mod_timer(&mp->timer, time);
1502                 }
1503
1504                 goto out;
1505         }
1506
1507         for (p = mlock_dereference(mp->ports, br);
1508              p != NULL;
1509              p = mlock_dereference(p->next, br)) {
1510                 if (p->port != port)
1511                         continue;
1512
1513                 if (!hlist_unhashed(&p->mglist) &&
1514                     (timer_pending(&p->timer) ?
1515                      time_after(p->timer.expires, time) :
1516                      try_to_del_timer_sync(&p->timer) >= 0)) {
1517                         mod_timer(&p->timer, time);
1518                 }
1519
1520                 break;
1521         }
1522 out:
1523         spin_unlock(&br->multicast_lock);
1524 }
1525
1526 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1527                                          struct net_bridge_port *port,
1528                                          __be32 group,
1529                                          __u16 vid)
1530 {
1531         struct br_ip br_group;
1532         struct bridge_mcast_own_query *own_query;
1533
1534         if (ipv4_is_local_multicast(group))
1535                 return;
1536
1537         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1538
1539         br_group.u.ip4 = group;
1540         br_group.proto = htons(ETH_P_IP);
1541         br_group.vid = vid;
1542
1543         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1544                                  own_query);
1545 }
1546
1547 #if IS_ENABLED(CONFIG_IPV6)
1548 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1549                                          struct net_bridge_port *port,
1550                                          const struct in6_addr *group,
1551                                          __u16 vid)
1552 {
1553         struct br_ip br_group;
1554         struct bridge_mcast_own_query *own_query;
1555
1556         if (ipv6_addr_is_ll_all_nodes(group))
1557                 return;
1558
1559         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1560
1561         br_group.u.ip6 = *group;
1562         br_group.proto = htons(ETH_P_IPV6);
1563         br_group.vid = vid;
1564
1565         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1566                                  own_query);
1567 }
1568 #endif
1569
1570 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1571                                  struct net_bridge_port *port,
1572                                  struct sk_buff *skb,
1573                                  u16 vid)
1574 {
1575         struct sk_buff *skb_trimmed = NULL;
1576         struct igmphdr *ih;
1577         int err;
1578
1579         err = ip_mc_check_igmp(skb, &skb_trimmed);
1580
1581         if (err == -ENOMSG) {
1582                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1583                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1584                 return 0;
1585         } else if (err < 0) {
1586                 return err;
1587         }
1588
1589         BR_INPUT_SKB_CB(skb)->igmp = 1;
1590         ih = igmp_hdr(skb);
1591
1592         switch (ih->type) {
1593         case IGMP_HOST_MEMBERSHIP_REPORT:
1594         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1595                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1596                 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1597                 break;
1598         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1599                 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1600                 break;
1601         case IGMP_HOST_MEMBERSHIP_QUERY:
1602                 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1603                 break;
1604         case IGMP_HOST_LEAVE_MESSAGE:
1605                 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1606                 break;
1607         }
1608
1609         if (skb_trimmed && skb_trimmed != skb)
1610                 kfree_skb(skb_trimmed);
1611
1612         return err;
1613 }
1614
1615 #if IS_ENABLED(CONFIG_IPV6)
1616 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1617                                  struct net_bridge_port *port,
1618                                  struct sk_buff *skb,
1619                                  u16 vid)
1620 {
1621         struct sk_buff *skb_trimmed = NULL;
1622         struct mld_msg *mld;
1623         int err;
1624
1625         err = ipv6_mc_check_mld(skb, &skb_trimmed);
1626
1627         if (err == -ENOMSG) {
1628                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1629                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1630                 return 0;
1631         } else if (err < 0) {
1632                 return err;
1633         }
1634
1635         BR_INPUT_SKB_CB(skb)->igmp = 1;
1636         mld = (struct mld_msg *)skb_transport_header(skb);
1637
1638         switch (mld->mld_type) {
1639         case ICMPV6_MGM_REPORT:
1640                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1641                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1642                 break;
1643         case ICMPV6_MLD2_REPORT:
1644                 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1645                 break;
1646         case ICMPV6_MGM_QUERY:
1647                 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1648                 break;
1649         case ICMPV6_MGM_REDUCTION:
1650                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1651                 break;
1652         }
1653
1654         if (skb_trimmed && skb_trimmed != skb)
1655                 kfree_skb(skb_trimmed);
1656
1657         return err;
1658 }
1659 #endif
1660
1661 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1662                      struct sk_buff *skb, u16 vid)
1663 {
1664         BR_INPUT_SKB_CB(skb)->igmp = 0;
1665         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1666
1667         if (br->multicast_disabled)
1668                 return 0;
1669
1670         switch (skb->protocol) {
1671         case htons(ETH_P_IP):
1672                 return br_multicast_ipv4_rcv(br, port, skb, vid);
1673 #if IS_ENABLED(CONFIG_IPV6)
1674         case htons(ETH_P_IPV6):
1675                 return br_multicast_ipv6_rcv(br, port, skb, vid);
1676 #endif
1677         }
1678
1679         return 0;
1680 }
1681
1682 static void br_multicast_query_expired(struct net_bridge *br,
1683                                        struct bridge_mcast_own_query *query,
1684                                        struct bridge_mcast_querier *querier)
1685 {
1686         spin_lock(&br->multicast_lock);
1687         if (query->startup_sent < br->multicast_startup_query_count)
1688                 query->startup_sent++;
1689
1690         RCU_INIT_POINTER(querier->port, NULL);
1691         br_multicast_send_query(br, NULL, query);
1692         spin_unlock(&br->multicast_lock);
1693 }
1694
1695 static void br_ip4_multicast_query_expired(unsigned long data)
1696 {
1697         struct net_bridge *br = (void *)data;
1698
1699         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1700 }
1701
1702 #if IS_ENABLED(CONFIG_IPV6)
1703 static void br_ip6_multicast_query_expired(unsigned long data)
1704 {
1705         struct net_bridge *br = (void *)data;
1706
1707         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1708 }
1709 #endif
1710
1711 void br_multicast_init(struct net_bridge *br)
1712 {
1713         br->hash_elasticity = 4;
1714         br->hash_max = 512;
1715
1716         br->multicast_router = 1;
1717         br->multicast_querier = 0;
1718         br->multicast_query_use_ifaddr = 0;
1719         br->multicast_last_member_count = 2;
1720         br->multicast_startup_query_count = 2;
1721
1722         br->multicast_last_member_interval = HZ;
1723         br->multicast_query_response_interval = 10 * HZ;
1724         br->multicast_startup_query_interval = 125 * HZ / 4;
1725         br->multicast_query_interval = 125 * HZ;
1726         br->multicast_querier_interval = 255 * HZ;
1727         br->multicast_membership_interval = 260 * HZ;
1728
1729         br->ip4_other_query.delay_time = 0;
1730         br->ip4_querier.port = NULL;
1731 #if IS_ENABLED(CONFIG_IPV6)
1732         br->ip6_other_query.delay_time = 0;
1733         br->ip6_querier.port = NULL;
1734 #endif
1735
1736         spin_lock_init(&br->multicast_lock);
1737         setup_timer(&br->multicast_router_timer,
1738                     br_multicast_local_router_expired, 0);
1739         setup_timer(&br->ip4_other_query.timer,
1740                     br_ip4_multicast_querier_expired, (unsigned long)br);
1741         setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1742                     (unsigned long)br);
1743 #if IS_ENABLED(CONFIG_IPV6)
1744         setup_timer(&br->ip6_other_query.timer,
1745                     br_ip6_multicast_querier_expired, (unsigned long)br);
1746         setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1747                     (unsigned long)br);
1748 #endif
1749 }
1750
1751 static void __br_multicast_open(struct net_bridge *br,
1752                                 struct bridge_mcast_own_query *query)
1753 {
1754         query->startup_sent = 0;
1755
1756         if (br->multicast_disabled)
1757                 return;
1758
1759         mod_timer(&query->timer, jiffies);
1760 }
1761
1762 void br_multicast_open(struct net_bridge *br)
1763 {
1764         __br_multicast_open(br, &br->ip4_own_query);
1765 #if IS_ENABLED(CONFIG_IPV6)
1766         __br_multicast_open(br, &br->ip6_own_query);
1767 #endif
1768 }
1769
1770 void br_multicast_stop(struct net_bridge *br)
1771 {
1772         del_timer_sync(&br->multicast_router_timer);
1773         del_timer_sync(&br->ip4_other_query.timer);
1774         del_timer_sync(&br->ip4_own_query.timer);
1775 #if IS_ENABLED(CONFIG_IPV6)
1776         del_timer_sync(&br->ip6_other_query.timer);
1777         del_timer_sync(&br->ip6_own_query.timer);
1778 #endif
1779 }
1780
1781 void br_multicast_dev_del(struct net_bridge *br)
1782 {
1783         struct net_bridge_mdb_htable *mdb;
1784         struct net_bridge_mdb_entry *mp;
1785         struct hlist_node *n;
1786         u32 ver;
1787         int i;
1788
1789         spin_lock_bh(&br->multicast_lock);
1790         mdb = mlock_dereference(br->mdb, br);
1791         if (!mdb)
1792                 goto out;
1793
1794         br->mdb = NULL;
1795
1796         ver = mdb->ver;
1797         for (i = 0; i < mdb->max; i++) {
1798                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1799                                           hlist[ver]) {
1800                         del_timer(&mp->timer);
1801                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
1802                 }
1803         }
1804
1805         if (mdb->old) {
1806                 spin_unlock_bh(&br->multicast_lock);
1807                 rcu_barrier_bh();
1808                 spin_lock_bh(&br->multicast_lock);
1809                 WARN_ON(mdb->old);
1810         }
1811
1812         mdb->old = mdb;
1813         call_rcu_bh(&mdb->rcu, br_mdb_free);
1814
1815 out:
1816         spin_unlock_bh(&br->multicast_lock);
1817 }
1818
1819 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1820 {
1821         int err = -EINVAL;
1822
1823         spin_lock_bh(&br->multicast_lock);
1824
1825         switch (val) {
1826         case 0:
1827         case 2:
1828                 del_timer(&br->multicast_router_timer);
1829                 /* fall through */
1830         case 1:
1831                 br->multicast_router = val;
1832                 err = 0;
1833                 break;
1834         }
1835
1836         spin_unlock_bh(&br->multicast_lock);
1837
1838         return err;
1839 }
1840
1841 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1842 {
1843         struct net_bridge *br = p->br;
1844         int err = -EINVAL;
1845
1846         spin_lock(&br->multicast_lock);
1847
1848         switch (val) {
1849         case 0:
1850         case 1:
1851         case 2:
1852                 p->multicast_router = val;
1853                 err = 0;
1854
1855                 if (val < 2 && !hlist_unhashed(&p->rlist)) {
1856                         hlist_del_init_rcu(&p->rlist);
1857                         br_rtr_notify(br->dev, p, RTM_DELMDB);
1858                 }
1859
1860                 if (val == 1)
1861                         break;
1862
1863                 del_timer(&p->multicast_router_timer);
1864
1865                 if (val == 0)
1866                         break;
1867
1868                 br_multicast_add_router(br, p);
1869                 break;
1870         }
1871
1872         spin_unlock(&br->multicast_lock);
1873
1874         return err;
1875 }
1876
1877 static void br_multicast_start_querier(struct net_bridge *br,
1878                                        struct bridge_mcast_own_query *query)
1879 {
1880         struct net_bridge_port *port;
1881
1882         __br_multicast_open(br, query);
1883
1884         list_for_each_entry(port, &br->port_list, list) {
1885                 if (port->state == BR_STATE_DISABLED ||
1886                     port->state == BR_STATE_BLOCKING)
1887                         continue;
1888
1889                 if (query == &br->ip4_own_query)
1890                         br_multicast_enable(&port->ip4_own_query);
1891 #if IS_ENABLED(CONFIG_IPV6)
1892                 else
1893                         br_multicast_enable(&port->ip6_own_query);
1894 #endif
1895         }
1896 }
1897
1898 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1899 {
1900         int err = 0;
1901         struct net_bridge_mdb_htable *mdb;
1902
1903         spin_lock_bh(&br->multicast_lock);
1904         if (br->multicast_disabled == !val)
1905                 goto unlock;
1906
1907         br->multicast_disabled = !val;
1908         if (br->multicast_disabled)
1909                 goto unlock;
1910
1911         if (!netif_running(br->dev))
1912                 goto unlock;
1913
1914         mdb = mlock_dereference(br->mdb, br);
1915         if (mdb) {
1916                 if (mdb->old) {
1917                         err = -EEXIST;
1918 rollback:
1919                         br->multicast_disabled = !!val;
1920                         goto unlock;
1921                 }
1922
1923                 err = br_mdb_rehash(&br->mdb, mdb->max,
1924                                     br->hash_elasticity);
1925                 if (err)
1926                         goto rollback;
1927         }
1928
1929         br_multicast_start_querier(br, &br->ip4_own_query);
1930 #if IS_ENABLED(CONFIG_IPV6)
1931         br_multicast_start_querier(br, &br->ip6_own_query);
1932 #endif
1933
1934 unlock:
1935         spin_unlock_bh(&br->multicast_lock);
1936
1937         return err;
1938 }
1939
1940 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1941 {
1942         unsigned long max_delay;
1943
1944         val = !!val;
1945
1946         spin_lock_bh(&br->multicast_lock);
1947         if (br->multicast_querier == val)
1948                 goto unlock;
1949
1950         br->multicast_querier = val;
1951         if (!val)
1952                 goto unlock;
1953
1954         max_delay = br->multicast_query_response_interval;
1955
1956         if (!timer_pending(&br->ip4_other_query.timer))
1957                 br->ip4_other_query.delay_time = jiffies + max_delay;
1958
1959         br_multicast_start_querier(br, &br->ip4_own_query);
1960
1961 #if IS_ENABLED(CONFIG_IPV6)
1962         if (!timer_pending(&br->ip6_other_query.timer))
1963                 br->ip6_other_query.delay_time = jiffies + max_delay;
1964
1965         br_multicast_start_querier(br, &br->ip6_own_query);
1966 #endif
1967
1968 unlock:
1969         spin_unlock_bh(&br->multicast_lock);
1970
1971         return 0;
1972 }
1973
1974 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1975 {
1976         int err = -EINVAL;
1977         u32 old;
1978         struct net_bridge_mdb_htable *mdb;
1979
1980         spin_lock_bh(&br->multicast_lock);
1981         if (!is_power_of_2(val))
1982                 goto unlock;
1983
1984         mdb = mlock_dereference(br->mdb, br);
1985         if (mdb && val < mdb->size)
1986                 goto unlock;
1987
1988         err = 0;
1989
1990         old = br->hash_max;
1991         br->hash_max = val;
1992
1993         if (mdb) {
1994                 if (mdb->old) {
1995                         err = -EEXIST;
1996 rollback:
1997                         br->hash_max = old;
1998                         goto unlock;
1999                 }
2000
2001                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2002                                     br->hash_elasticity);
2003                 if (err)
2004                         goto rollback;
2005         }
2006
2007 unlock:
2008         spin_unlock_bh(&br->multicast_lock);
2009
2010         return err;
2011 }
2012
2013 /**
2014  * br_multicast_list_adjacent - Returns snooped multicast addresses
2015  * @dev:        The bridge port adjacent to which to retrieve addresses
2016  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2017  *
2018  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2019  * snooping feature on all bridge ports of dev's bridge device, excluding
2020  * the addresses from dev itself.
2021  *
2022  * Returns the number of items added to br_ip_list.
2023  *
2024  * Notes:
2025  * - br_ip_list needs to be initialized by caller
2026  * - br_ip_list might contain duplicates in the end
2027  *   (needs to be taken care of by caller)
2028  * - br_ip_list needs to be freed by caller
2029  */
2030 int br_multicast_list_adjacent(struct net_device *dev,
2031                                struct list_head *br_ip_list)
2032 {
2033         struct net_bridge *br;
2034         struct net_bridge_port *port;
2035         struct net_bridge_port_group *group;
2036         struct br_ip_list *entry;
2037         int count = 0;
2038
2039         rcu_read_lock();
2040         if (!br_ip_list || !br_port_exists(dev))
2041                 goto unlock;
2042
2043         port = br_port_get_rcu(dev);
2044         if (!port || !port->br)
2045                 goto unlock;
2046
2047         br = port->br;
2048
2049         list_for_each_entry_rcu(port, &br->port_list, list) {
2050                 if (!port->dev || port->dev == dev)
2051                         continue;
2052
2053                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2054                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2055                         if (!entry)
2056                                 goto unlock;
2057
2058                         entry->addr = group->addr;
2059                         list_add(&entry->list, br_ip_list);
2060                         count++;
2061                 }
2062         }
2063
2064 unlock:
2065         rcu_read_unlock();
2066         return count;
2067 }
2068 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2069
2070 /**
2071  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2072  * @dev: The bridge port providing the bridge on which to check for a querier
2073  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2074  *
2075  * Checks whether the given interface has a bridge on top and if so returns
2076  * true if a valid querier exists anywhere on the bridged link layer.
2077  * Otherwise returns false.
2078  */
2079 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2080 {
2081         struct net_bridge *br;
2082         struct net_bridge_port *port;
2083         struct ethhdr eth;
2084         bool ret = false;
2085
2086         rcu_read_lock();
2087         if (!br_port_exists(dev))
2088                 goto unlock;
2089
2090         port = br_port_get_rcu(dev);
2091         if (!port || !port->br)
2092                 goto unlock;
2093
2094         br = port->br;
2095
2096         memset(&eth, 0, sizeof(eth));
2097         eth.h_proto = htons(proto);
2098
2099         ret = br_multicast_querier_exists(br, &eth);
2100
2101 unlock:
2102         rcu_read_unlock();
2103         return ret;
2104 }
2105 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2106
2107 /**
2108  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2109  * @dev: The bridge port adjacent to which to check for a querier
2110  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2111  *
2112  * Checks whether the given interface has a bridge on top and if so returns
2113  * true if a selected querier is behind one of the other ports of this
2114  * bridge. Otherwise returns false.
2115  */
2116 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2117 {
2118         struct net_bridge *br;
2119         struct net_bridge_port *port;
2120         bool ret = false;
2121
2122         rcu_read_lock();
2123         if (!br_port_exists(dev))
2124                 goto unlock;
2125
2126         port = br_port_get_rcu(dev);
2127         if (!port || !port->br)
2128                 goto unlock;
2129
2130         br = port->br;
2131
2132         switch (proto) {
2133         case ETH_P_IP:
2134                 if (!timer_pending(&br->ip4_other_query.timer) ||
2135                     rcu_dereference(br->ip4_querier.port) == port)
2136                         goto unlock;
2137                 break;
2138 #if IS_ENABLED(CONFIG_IPV6)
2139         case ETH_P_IPV6:
2140                 if (!timer_pending(&br->ip6_other_query.timer) ||
2141                     rcu_dereference(br->ip6_querier.port) == port)
2142                         goto unlock;
2143                 break;
2144 #endif
2145         default:
2146                 goto unlock;
2147         }
2148
2149         ret = true;
2150 unlock:
2151         rcu_read_unlock();
2152         return ret;
2153 }
2154 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);