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->port, &pg->addr, RTM_DELMDB,
 287                               p->state);
 288                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
 289
 290                 if (!mp->ports && !mp->mglist &&
 291                     netif_running(br->dev))
 292                         mod_timer(&mp->timer, jiffies);
 293
 294                 return;
 295         }
 296
 297         WARN_ON(1);
 298 }
 299
 300 static void br_multicast_port_group_expired(unsigned long data)
 301 {
 302         struct net_bridge_port_group *pg = (void *)data;
 303         struct net_bridge *br = pg->port->br;
 304
 305         spin_lock(&br->multicast_lock);
 306         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
 307             hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
 308                 goto out;
 309
 310         br_multicast_del_pg(br, pg);
 311
 312 out:
 313         spin_unlock(&br->multicast_lock);
 314 }
 315
 316 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
 317                          int elasticity)
 318 {
 319         struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
 320         struct net_bridge_mdb_htable *mdb;
 321         int err;
 322
 323         mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
 324         if (!mdb)
 325                 return -ENOMEM;
 326
 327         mdb->max = max;
 328         mdb->old = old;
 329
 330         mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
 331         if (!mdb->mhash) {
 332                 kfree(mdb);
 333                 return -ENOMEM;
 334         }
 335
 336         mdb->size = old ? old->size : 0;
 337         mdb->ver = old ? old->ver ^ 1 : 0;
 338
 339         if (!old || elasticity)
 340                 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
 341         else
 342                 mdb->secret = old->secret;
 343
 344         if (!old)
 345                 goto out;
 346
 347         err = br_mdb_copy(mdb, old, elasticity);
 348         if (err) {
 349                 kfree(mdb->mhash);
 350                 kfree(mdb);
 351                 return err;
 352         }
 353
 354         br_mdb_rehash_seq++;
 355         call_rcu_bh(&mdb->rcu, br_mdb_free);
 356
 357 out:
 358         rcu_assign_pointer(*mdbp, mdb);
 359
 360         return 0;
 361 }
 362
 363 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
 364                                                     __be32 group)
 365 {
 366         struct sk_buff *skb;
 367         struct igmphdr *ih;
 368         struct ethhdr *eth;
 369         struct iphdr *iph;
 370
 371         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
 372                                                  sizeof(*ih) + 4);
 373         if (!skb)
 374                 goto out;
 375
 376         skb->protocol = htons(ETH_P_IP);
 377
 378         skb_reset_mac_header(skb);
 379         eth = eth_hdr(skb);
 380
 381         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 382         eth->h_dest[0] = 1;
 383         eth->h_dest[1] = 0;
 384         eth->h_dest[2] = 0x5e;
 385         eth->h_dest[3] = 0;
 386         eth->h_dest[4] = 0;
 387         eth->h_dest[5] = 1;
 388         eth->h_proto = htons(ETH_P_IP);
 389         skb_put(skb, sizeof(*eth));
 390
 391         skb_set_network_header(skb, skb->len);
 392         iph = ip_hdr(skb);
 393
 394         iph->version = 4;
 395         iph->ihl = 6;
 396         iph->tos = 0xc0;
 397         iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
 398         iph->id = 0;
 399         iph->frag_off = htons(IP_DF);
 400         iph->ttl = 1;
 401         iph->protocol = IPPROTO_IGMP;
 402         iph->saddr = br->multicast_query_use_ifaddr ?
 403                      inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
 404         iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 405         ((u8 *)&iph[1])[0] = IPOPT_RA;
 406         ((u8 *)&iph[1])[1] = 4;
 407         ((u8 *)&iph[1])[2] = 0;
 408         ((u8 *)&iph[1])[3] = 0;
 409         ip_send_check(iph);
 410         skb_put(skb, 24);
 411
 412         skb_set_transport_header(skb, skb->len);
 413         ih = igmp_hdr(skb);
 414         ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
 415         ih->code = (group ? br->multicast_last_member_interval :
 416                             br->multicast_query_response_interval) /
 417                    (HZ / IGMP_TIMER_SCALE);
 418         ih->group = group;
 419         ih->csum = 0;
 420         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 421         skb_put(skb, sizeof(*ih));
 422
 423         __skb_pull(skb, sizeof(*eth));
 424
 425 out:
 426         return skb;
 427 }
 428
 429 #if IS_ENABLED(CONFIG_IPV6)
 430 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
 431                                                     const struct in6_addr *group)
 432 {
 433         struct sk_buff *skb;
 434         struct ipv6hdr *ip6h;
 435         struct mld_msg *mldq;
 436         struct ethhdr *eth;
 437         u8 *hopopt;
 438         unsigned long interval;
 439
 440         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
 441                                                  8 + sizeof(*mldq));
 442         if (!skb)
 443                 goto out;
 444
 445         skb->protocol = htons(ETH_P_IPV6);
 446
 447         /* Ethernet header */
 448         skb_reset_mac_header(skb);
 449         eth = eth_hdr(skb);
 450
 451         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 452         eth->h_proto = htons(ETH_P_IPV6);
 453         skb_put(skb, sizeof(*eth));
 454
 455         /* IPv6 header + HbH option */
 456         skb_set_network_header(skb, skb->len);
 457         ip6h = ipv6_hdr(skb);
 458
 459         *(__force __be32 *)ip6h = htonl(0x60000000);
 460         ip6h->payload_len = htons(8 + sizeof(*mldq));
 461         ip6h->nexthdr = IPPROTO_HOPOPTS;
 462         ip6h->hop_limit = 1;
 463         ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
 464         if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
 465                                &ip6h->saddr)) {
 466                 kfree_skb(skb);
 467                 return NULL;
 468         }
 469         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 470
 471         hopopt = (u8 *)(ip6h + 1);
 472         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
 473         hopopt[1] = 0;                          /* length of HbH */
 474         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
 475         hopopt[3] = 2;                          /* Length of RA Option */
 476         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
 477         hopopt[5] = 0;
 478         hopopt[6] = IPV6_TLV_PAD1;              /* Pad1 */
 479         hopopt[7] = IPV6_TLV_PAD1;              /* Pad1 */
 480
 481         skb_put(skb, sizeof(*ip6h) + 8);
 482
 483         /* ICMPv6 */
 484         skb_set_transport_header(skb, skb->len);
 485         mldq = (struct mld_msg *) icmp6_hdr(skb);
 486
 487         interval = ipv6_addr_any(group) ?
 488                         br->multicast_query_response_interval :
 489                         br->multicast_last_member_interval;
 490
 491         mldq->mld_type = ICMPV6_MGM_QUERY;
 492         mldq->mld_code = 0;
 493         mldq->mld_cksum = 0;
 494         mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
 495         mldq->mld_reserved = 0;
 496         mldq->mld_mca = *group;
 497
 498         /* checksum */
 499         mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 500                                           sizeof(*mldq), IPPROTO_ICMPV6,
 501                                           csum_partial(mldq,
 502                                                        sizeof(*mldq), 0));
 503         skb_put(skb, sizeof(*mldq));
 504
 505         __skb_pull(skb, sizeof(*eth));
 506
 507 out:
 508         return skb;
 509 }
 510 #endif
 511
 512 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 513                                                 struct br_ip *addr)
 514 {
 515         switch (addr->proto) {
 516         case htons(ETH_P_IP):
 517                 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
 518 #if IS_ENABLED(CONFIG_IPV6)
 519         case htons(ETH_P_IPV6):
 520                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
 521 #endif
 522         }
 523         return NULL;
 524 }
 525
 526 static struct net_bridge_mdb_entry *br_multicast_get_group(
 527         struct net_bridge *br, struct net_bridge_port *port,
 528         struct br_ip *group, int hash)
 529 {
 530         struct net_bridge_mdb_htable *mdb;
 531         struct net_bridge_mdb_entry *mp;
 532         unsigned int count = 0;
 533         unsigned int max;
 534         int elasticity;
 535         int err;
 536
 537         mdb = rcu_dereference_protected(br->mdb, 1);
 538         hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 539                 count++;
 540                 if (unlikely(br_ip_equal(group, &mp->addr)))
 541                         return mp;
 542         }
 543
 544         elasticity = 0;
 545         max = mdb->max;
 546
 547         if (unlikely(count > br->hash_elasticity && count)) {
 548                 if (net_ratelimit())
 549                         br_info(br, "Multicast hash table "
 550                                 "chain limit reached: %s\n",
 551                                 port ? port->dev->name : br->dev->name);
 552
 553                 elasticity = br->hash_elasticity;
 554         }
 555
 556         if (mdb->size >= max) {
 557                 max *= 2;
 558                 if (unlikely(max > br->hash_max)) {
 559                         br_warn(br, "Multicast hash table maximum of %d "
 560                                 "reached, disabling snooping: %s\n",
 561                                 br->hash_max,
 562                                 port ? port->dev->name : br->dev->name);
 563                         err = -E2BIG;
 564 disable:
 565                         br->multicast_disabled = 1;
 566                         goto err;
 567                 }
 568         }
 569
 570         if (max > mdb->max || elasticity) {
 571                 if (mdb->old) {
 572                         if (net_ratelimit())
 573                                 br_info(br, "Multicast hash table "
 574                                         "on fire: %s\n",
 575                                         port ? port->dev->name : br->dev->name);
 576                         err = -EEXIST;
 577                         goto err;
 578                 }
 579
 580                 err = br_mdb_rehash(&br->mdb, max, elasticity);
 581                 if (err) {
 582                         br_warn(br, "Cannot rehash multicast "
 583                                 "hash table, disabling snooping: %s, %d, %d\n",
 584                                 port ? port->dev->name : br->dev->name,
 585                                 mdb->size, err);
 586                         goto disable;
 587                 }
 588
 589                 err = -EAGAIN;
 590                 goto err;
 591         }
 592
 593         return NULL;
 594
 595 err:
 596         mp = ERR_PTR(err);
 597         return mp;
 598 }
 599
 600 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 601         struct net_bridge_port *port, struct br_ip *group)
 602 {
 603         struct net_bridge_mdb_htable *mdb;
 604         struct net_bridge_mdb_entry *mp;
 605         int hash;
 606         int err;
 607
 608         mdb = rcu_dereference_protected(br->mdb, 1);
 609         if (!mdb) {
 610                 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
 611                 if (err)
 612                         return ERR_PTR(err);
 613                 goto rehash;
 614         }
 615
 616         hash = br_ip_hash(mdb, group);
 617         mp = br_multicast_get_group(br, port, group, hash);
 618         switch (PTR_ERR(mp)) {
 619         case 0:
 620                 break;
 621
 622         case -EAGAIN:
 623 rehash:
 624                 mdb = rcu_dereference_protected(br->mdb, 1);
 625                 hash = br_ip_hash(mdb, group);
 626                 break;
 627
 628         default:
 629                 goto out;
 630         }
 631
 632         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 633         if (unlikely(!mp))
 634                 return ERR_PTR(-ENOMEM);
 635
 636         mp->br = br;
 637         mp->addr = *group;
 638         setup_timer(&mp->timer, br_multicast_group_expired,
 639                     (unsigned long)mp);
 640
 641         hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
 642         mdb->size++;
 643
 644 out:
 645         return mp;
 646 }
 647
 648 struct net_bridge_port_group *br_multicast_new_port_group(
 649                         struct net_bridge_port *port,
 650                         struct br_ip *group,
 651                         struct net_bridge_port_group __rcu *next,
 652                         unsigned char state)
 653 {
 654         struct net_bridge_port_group *p;
 655
 656         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 657         if (unlikely(!p))
 658                 return NULL;
 659
 660         p->addr = *group;
 661         p->port = port;
 662         p->state = state;
 663         rcu_assign_pointer(p->next, next);
 664         hlist_add_head(&p->mglist, &port->mglist);
 665         setup_timer(&p->timer, br_multicast_port_group_expired,
 666                     (unsigned long)p);
 667         return p;
 668 }
 669
 670 static int br_multicast_add_group(struct net_bridge *br,
 671                                   struct net_bridge_port *port,
 672                                   struct br_ip *group)
 673 {
 674         struct net_bridge_mdb_entry *mp;
 675         struct net_bridge_port_group *p;
 676         struct net_bridge_port_group __rcu **pp;
 677         unsigned long now = jiffies;
 678         int err;
 679
 680         spin_lock(&br->multicast_lock);
 681         if (!netif_running(br->dev) ||
 682             (port && port->state == BR_STATE_DISABLED))
 683                 goto out;
 684
 685         mp = br_multicast_new_group(br, port, group);
 686         err = PTR_ERR(mp);
 687         if (IS_ERR(mp))
 688                 goto err;
 689
 690         if (!port) {
 691                 mp->mglist = true;
 692                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
 693                 goto out;
 694         }
 695
 696         for (pp = &mp->ports;
 697              (p = mlock_dereference(*pp, br)) != NULL;
 698              pp = &p->next) {
 699                 if (p->port == port)
 700                         goto found;
 701                 if ((unsigned long)p->port < (unsigned long)port)
 702                         break;
 703         }
 704
 705         p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
 706         if (unlikely(!p))
 707                 goto err;
 708         rcu_assign_pointer(*pp, p);
 709         br_mdb_notify(br->dev, port, group, RTM_NEWMDB, MDB_TEMPORARY);
 710
 711 found:
 712         mod_timer(&p->timer, now + br->multicast_membership_interval);
 713 out:
 714         err = 0;
 715
 716 err:
 717         spin_unlock(&br->multicast_lock);
 718         return err;
 719 }
 720
 721 static int br_ip4_multicast_add_group(struct net_bridge *br,
 722                                       struct net_bridge_port *port,
 723                                       __be32 group,
 724                                       __u16 vid)
 725 {
 726         struct br_ip br_group;
 727
 728         if (ipv4_is_local_multicast(group))
 729                 return 0;
 730
 731         br_group.u.ip4 = group;
 732         br_group.proto = htons(ETH_P_IP);
 733         br_group.vid = vid;
 734
 735         return br_multicast_add_group(br, port, &br_group);
 736 }
 737
 738 #if IS_ENABLED(CONFIG_IPV6)
 739 static int br_ip6_multicast_add_group(struct net_bridge *br,
 740                                       struct net_bridge_port *port,
 741                                       const struct in6_addr *group,
 742                                       __u16 vid)
 743 {
 744         struct br_ip br_group;
 745
 746         if (ipv6_addr_is_ll_all_nodes(group))
 747                 return 0;
 748
 749         br_group.u.ip6 = *group;
 750         br_group.proto = htons(ETH_P_IPV6);
 751         br_group.vid = vid;
 752
 753         return br_multicast_add_group(br, port, &br_group);
 754 }
 755 #endif
 756
 757 static void br_multicast_router_expired(unsigned long data)
 758 {
 759         struct net_bridge_port *port = (void *)data;
 760         struct net_bridge *br = port->br;
 761
 762         spin_lock(&br->multicast_lock);
 763         if (port->multicast_router != 1 ||
 764             timer_pending(&port->multicast_router_timer) ||
 765             hlist_unhashed(&port->rlist))
 766                 goto out;
 767
 768         hlist_del_init_rcu(&port->rlist);
 769         br_rtr_notify(br->dev, port, RTM_DELMDB);
 770
 771 out:
 772         spin_unlock(&br->multicast_lock);
 773 }
 774
 775 static void br_multicast_local_router_expired(unsigned long data)
 776 {
 777 }
 778
 779 static void br_multicast_querier_expired(struct net_bridge *br,
 780                                          struct bridge_mcast_own_query *query)
 781 {
 782         spin_lock(&br->multicast_lock);
 783         if (!netif_running(br->dev) || br->multicast_disabled)
 784                 goto out;
 785
 786         br_multicast_start_querier(br, query);
 787
 788 out:
 789         spin_unlock(&br->multicast_lock);
 790 }
 791
 792 static void br_ip4_multicast_querier_expired(unsigned long data)
 793 {
 794         struct net_bridge *br = (void *)data;
 795
 796         br_multicast_querier_expired(br, &br->ip4_own_query);
 797 }
 798
 799 #if IS_ENABLED(CONFIG_IPV6)
 800 static void br_ip6_multicast_querier_expired(unsigned long data)
 801 {
 802         struct net_bridge *br = (void *)data;
 803
 804         br_multicast_querier_expired(br, &br->ip6_own_query);
 805 }
 806 #endif
 807
 808 static void br_multicast_select_own_querier(struct net_bridge *br,
 809                                             struct br_ip *ip,
 810                                             struct sk_buff *skb)
 811 {
 812         if (ip->proto == htons(ETH_P_IP))
 813                 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
 814 #if IS_ENABLED(CONFIG_IPV6)
 815         else
 816                 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
 817 #endif
 818 }
 819
 820 static void __br_multicast_send_query(struct net_bridge *br,
 821                                       struct net_bridge_port *port,
 822                                       struct br_ip *ip)
 823 {
 824         struct sk_buff *skb;
 825
 826         skb = br_multicast_alloc_query(br, ip);
 827         if (!skb)
 828                 return;
 829
 830         if (port) {
 831                 skb->dev = port->dev;
 832                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, NULL, skb,
 833                         NULL, skb->dev,
 834                         br_dev_queue_push_xmit);
 835         } else {
 836                 br_multicast_select_own_querier(br, ip, skb);
 837                 netif_rx(skb);
 838         }
 839 }
 840
 841 static void br_multicast_send_query(struct net_bridge *br,
 842                                     struct net_bridge_port *port,
 843                                     struct bridge_mcast_own_query *own_query)
 844 {
 845         unsigned long time;
 846         struct br_ip br_group;
 847         struct bridge_mcast_other_query *other_query = NULL;
 848
 849         if (!netif_running(br->dev) || br->multicast_disabled ||
 850             !br->multicast_querier)
 851                 return;
 852
 853         memset(&br_group.u, 0, sizeof(br_group.u));
 854
 855         if (port ? (own_query == &port->ip4_own_query) :
 856                    (own_query == &br->ip4_own_query)) {
 857                 other_query = &br->ip4_other_query;
 858                 br_group.proto = htons(ETH_P_IP);
 859 #if IS_ENABLED(CONFIG_IPV6)
 860         } else {
 861                 other_query = &br->ip6_other_query;
 862                 br_group.proto = htons(ETH_P_IPV6);
 863 #endif
 864         }
 865
 866         if (!other_query || timer_pending(&other_query->timer))
 867                 return;
 868
 869         __br_multicast_send_query(br, port, &br_group);
 870
 871         time = jiffies;
 872         time += own_query->startup_sent < br->multicast_startup_query_count ?
 873                 br->multicast_startup_query_interval :
 874                 br->multicast_query_interval;
 875         mod_timer(&own_query->timer, time);
 876 }
 877
 878 static void
 879 br_multicast_port_query_expired(struct net_bridge_port *port,
 880                                 struct bridge_mcast_own_query *query)
 881 {
 882         struct net_bridge *br = port->br;
 883
 884         spin_lock(&br->multicast_lock);
 885         if (port->state == BR_STATE_DISABLED ||
 886             port->state == BR_STATE_BLOCKING)
 887                 goto out;
 888
 889         if (query->startup_sent < br->multicast_startup_query_count)
 890                 query->startup_sent++;
 891
 892         br_multicast_send_query(port->br, port, query);
 893
 894 out:
 895         spin_unlock(&br->multicast_lock);
 896 }
 897
 898 static void br_ip4_multicast_port_query_expired(unsigned long data)
 899 {
 900         struct net_bridge_port *port = (void *)data;
 901
 902         br_multicast_port_query_expired(port, &port->ip4_own_query);
 903 }
 904
 905 #if IS_ENABLED(CONFIG_IPV6)
 906 static void br_ip6_multicast_port_query_expired(unsigned long data)
 907 {
 908         struct net_bridge_port *port = (void *)data;
 909
 910         br_multicast_port_query_expired(port, &port->ip6_own_query);
 911 }
 912 #endif
 913
 914 void br_multicast_add_port(struct net_bridge_port *port)
 915 {
 916         port->multicast_router = 1;
 917
 918         setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
 919                     (unsigned long)port);
 920         setup_timer(&port->ip4_own_query.timer,
 921                     br_ip4_multicast_port_query_expired, (unsigned long)port);
 922 #if IS_ENABLED(CONFIG_IPV6)
 923         setup_timer(&port->ip6_own_query.timer,
 924                     br_ip6_multicast_port_query_expired, (unsigned long)port);
 925 #endif
 926 }
 927
 928 void br_multicast_del_port(struct net_bridge_port *port)
 929 {
 930         struct net_bridge *br = port->br;
 931         struct net_bridge_port_group *pg;
 932         struct hlist_node *n;
 933
 934         /* Take care of the remaining groups, only perm ones should be left */
 935         spin_lock_bh(&br->multicast_lock);
 936         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 937                 br_multicast_del_pg(br, pg);
 938         spin_unlock_bh(&br->multicast_lock);
 939         del_timer_sync(&port->multicast_router_timer);
 940 }
 941
 942 static void br_multicast_enable(struct bridge_mcast_own_query *query)
 943 {
 944         query->startup_sent = 0;
 945
 946         if (try_to_del_timer_sync(&query->timer) >= 0 ||
 947             del_timer(&query->timer))
 948                 mod_timer(&query->timer, jiffies);
 949 }
 950
 951 void br_multicast_enable_port(struct net_bridge_port *port)
 952 {
 953         struct net_bridge *br = port->br;
 954
 955         spin_lock(&br->multicast_lock);
 956         if (br->multicast_disabled || !netif_running(br->dev))
 957                 goto out;
 958
 959         br_multicast_enable(&port->ip4_own_query);
 960 #if IS_ENABLED(CONFIG_IPV6)
 961         br_multicast_enable(&port->ip6_own_query);
 962 #endif
 963         if (port->multicast_router == 2 && hlist_unhashed(&port->rlist))
 964                 br_multicast_add_router(br, port);
 965
 966 out:
 967         spin_unlock(&br->multicast_lock);
 968 }
 969
 970 void br_multicast_disable_port(struct net_bridge_port *port)
 971 {
 972         struct net_bridge *br = port->br;
 973         struct net_bridge_port_group *pg;
 974         struct hlist_node *n;
 975
 976         spin_lock(&br->multicast_lock);
 977         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 978                 if (pg->state == MDB_TEMPORARY)
 979                         br_multicast_del_pg(br, pg);
 980
 981         if (!hlist_unhashed(&port->rlist)) {
 982                 hlist_del_init_rcu(&port->rlist);
 983                 br_rtr_notify(br->dev, port, RTM_DELMDB);
 984         }
 985         del_timer(&port->multicast_router_timer);
 986         del_timer(&port->ip4_own_query.timer);
 987 #if IS_ENABLED(CONFIG_IPV6)
 988         del_timer(&port->ip6_own_query.timer);
 989 #endif
 990         spin_unlock(&br->multicast_lock);
 991 }
 992
 993 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
 994                                          struct net_bridge_port *port,
 995                                          struct sk_buff *skb,
 996                                          u16 vid)
 997 {
 998         struct igmpv3_report *ih;
 999         struct igmpv3_grec *grec;
1000         int i;
1001         int len;
1002         int num;
1003         int type;
1004         int err = 0;
1005         __be32 group;
1006
1007         ih = igmpv3_report_hdr(skb);
1008         num = ntohs(ih->ngrec);
1009         len = skb_transport_offset(skb) + sizeof(*ih);
1010
1011         for (i = 0; i < num; i++) {
1012                 len += sizeof(*grec);
1013                 if (!pskb_may_pull(skb, len))
1014                         return -EINVAL;
1015
1016                 grec = (void *)(skb->data + len - sizeof(*grec));
1017                 group = grec->grec_mca;
1018                 type = grec->grec_type;
1019
1020                 len += ntohs(grec->grec_nsrcs) * 4;
1021                 if (!pskb_may_pull(skb, len))
1022                         return -EINVAL;
1023
1024                 /* We treat this as an IGMPv2 report for now. */
1025                 switch (type) {
1026                 case IGMPV3_MODE_IS_INCLUDE:
1027                 case IGMPV3_MODE_IS_EXCLUDE:
1028                 case IGMPV3_CHANGE_TO_INCLUDE:
1029                 case IGMPV3_CHANGE_TO_EXCLUDE:
1030                 case IGMPV3_ALLOW_NEW_SOURCES:
1031                 case IGMPV3_BLOCK_OLD_SOURCES:
1032                         break;
1033
1034                 default:
1035                         continue;
1036                 }
1037
1038                 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1039                      type == IGMPV3_MODE_IS_INCLUDE) &&
1040                     ntohs(grec->grec_nsrcs) == 0) {
1041                         br_ip4_multicast_leave_group(br, port, group, vid);
1042                 } else {
1043                         err = br_ip4_multicast_add_group(br, port, group, vid);
1044                         if (err)
1045                                 break;
1046                 }
1047         }
1048
1049         return err;
1050 }
1051
1052 #if IS_ENABLED(CONFIG_IPV6)
1053 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1054                                         struct net_bridge_port *port,
1055                                         struct sk_buff *skb,
1056                                         u16 vid)
1057 {
1058         struct icmp6hdr *icmp6h;
1059         struct mld2_grec *grec;
1060         int i;
1061         int len;
1062         int num;
1063         int err = 0;
1064
1065         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1066                 return -EINVAL;
1067
1068         icmp6h = icmp6_hdr(skb);
1069         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1070         len = skb_transport_offset(skb) + sizeof(*icmp6h);
1071
1072         for (i = 0; i < num; i++) {
1073                 __be16 *nsrcs, _nsrcs;
1074
1075                 nsrcs = skb_header_pointer(skb,
1076                                            len + offsetof(struct mld2_grec,
1077                                                           grec_nsrcs),
1078                                            sizeof(_nsrcs), &_nsrcs);
1079                 if (!nsrcs)
1080                         return -EINVAL;
1081
1082                 if (!pskb_may_pull(skb,
1083                                    len + sizeof(*grec) +
1084                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
1085                         return -EINVAL;
1086
1087                 grec = (struct mld2_grec *)(skb->data + len);
1088                 len += sizeof(*grec) +
1089                        sizeof(struct in6_addr) * ntohs(*nsrcs);
1090
1091                 /* We treat these as MLDv1 reports for now. */
1092                 switch (grec->grec_type) {
1093                 case MLD2_MODE_IS_INCLUDE:
1094                 case MLD2_MODE_IS_EXCLUDE:
1095                 case MLD2_CHANGE_TO_INCLUDE:
1096                 case MLD2_CHANGE_TO_EXCLUDE:
1097                 case MLD2_ALLOW_NEW_SOURCES:
1098                 case MLD2_BLOCK_OLD_SOURCES:
1099                         break;
1100
1101                 default:
1102                         continue;
1103                 }
1104
1105                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1106                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1107                     ntohs(*nsrcs) == 0) {
1108                         br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1109                                                      vid);
1110                 } else {
1111                         err = br_ip6_multicast_add_group(br, port,
1112                                                          &grec->grec_mca, vid);
1113                         if (!err)
1114                                 break;
1115                 }
1116         }
1117
1118         return err;
1119 }
1120 #endif
1121
1122 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1123                                             struct net_bridge_port *port,
1124                                             __be32 saddr)
1125 {
1126         if (!timer_pending(&br->ip4_own_query.timer) &&
1127             !timer_pending(&br->ip4_other_query.timer))
1128                 goto update;
1129
1130         if (!br->ip4_querier.addr.u.ip4)
1131                 goto update;
1132
1133         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1134                 goto update;
1135
1136         return false;
1137
1138 update:
1139         br->ip4_querier.addr.u.ip4 = saddr;
1140
1141         /* update protected by general multicast_lock by caller */
1142         rcu_assign_pointer(br->ip4_querier.port, port);
1143
1144         return true;
1145 }
1146
1147 #if IS_ENABLED(CONFIG_IPV6)
1148 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1149                                             struct net_bridge_port *port,
1150                                             struct in6_addr *saddr)
1151 {
1152         if (!timer_pending(&br->ip6_own_query.timer) &&
1153             !timer_pending(&br->ip6_other_query.timer))
1154                 goto update;
1155
1156         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1157                 goto update;
1158
1159         return false;
1160
1161 update:
1162         br->ip6_querier.addr.u.ip6 = *saddr;
1163
1164         /* update protected by general multicast_lock by caller */
1165         rcu_assign_pointer(br->ip6_querier.port, port);
1166
1167         return true;
1168 }
1169 #endif
1170
1171 static bool br_multicast_select_querier(struct net_bridge *br,
1172                                         struct net_bridge_port *port,
1173                                         struct br_ip *saddr)
1174 {
1175         switch (saddr->proto) {
1176         case htons(ETH_P_IP):
1177                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1178 #if IS_ENABLED(CONFIG_IPV6)
1179         case htons(ETH_P_IPV6):
1180                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1181 #endif
1182         }
1183
1184         return false;
1185 }
1186
1187 static void
1188 br_multicast_update_query_timer(struct net_bridge *br,
1189                                 struct bridge_mcast_other_query *query,
1190                                 unsigned long max_delay)
1191 {
1192         if (!timer_pending(&query->timer))
1193                 query->delay_time = jiffies + max_delay;
1194
1195         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1196 }
1197
1198 /*
1199  * Add port to router_list
1200  *  list is maintained ordered by pointer value
1201  *  and locked by br->multicast_lock and RCU
1202  */
1203 static void br_multicast_add_router(struct net_bridge *br,
1204                                     struct net_bridge_port *port)
1205 {
1206         struct net_bridge_port *p;
1207         struct hlist_node *slot = NULL;
1208
1209         if (!hlist_unhashed(&port->rlist))
1210                 return;
1211
1212         hlist_for_each_entry(p, &br->router_list, rlist) {
1213                 if ((unsigned long) port >= (unsigned long) p)
1214                         break;
1215                 slot = &p->rlist;
1216         }
1217
1218         if (slot)
1219                 hlist_add_behind_rcu(&port->rlist, slot);
1220         else
1221                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1222         br_rtr_notify(br->dev, port, RTM_NEWMDB);
1223 }
1224
1225 static void br_multicast_mark_router(struct net_bridge *br,
1226                                      struct net_bridge_port *port)
1227 {
1228         unsigned long now = jiffies;
1229
1230         if (!port) {
1231                 if (br->multicast_router == 1)
1232                         mod_timer(&br->multicast_router_timer,
1233                                   now + br->multicast_querier_interval);
1234                 return;
1235         }
1236
1237         if (port->multicast_router != 1)
1238                 return;
1239
1240         br_multicast_add_router(br, port);
1241
1242         mod_timer(&port->multicast_router_timer,
1243                   now + br->multicast_querier_interval);
1244 }
1245
1246 static void br_multicast_query_received(struct net_bridge *br,
1247                                         struct net_bridge_port *port,
1248                                         struct bridge_mcast_other_query *query,
1249                                         struct br_ip *saddr,
1250                                         unsigned long max_delay)
1251 {
1252         if (!br_multicast_select_querier(br, port, saddr))
1253                 return;
1254
1255         br_multicast_update_query_timer(br, query, max_delay);
1256         br_multicast_mark_router(br, port);
1257 }
1258
1259 static int br_ip4_multicast_query(struct net_bridge *br,
1260                                   struct net_bridge_port *port,
1261                                   struct sk_buff *skb,
1262                                   u16 vid)
1263 {
1264         const struct iphdr *iph = ip_hdr(skb);
1265         struct igmphdr *ih = igmp_hdr(skb);
1266         struct net_bridge_mdb_entry *mp;
1267         struct igmpv3_query *ih3;
1268         struct net_bridge_port_group *p;
1269         struct net_bridge_port_group __rcu **pp;
1270         struct br_ip saddr;
1271         unsigned long max_delay;
1272         unsigned long now = jiffies;
1273         __be32 group;
1274         int err = 0;
1275
1276         spin_lock(&br->multicast_lock);
1277         if (!netif_running(br->dev) ||
1278             (port && port->state == BR_STATE_DISABLED))
1279                 goto out;
1280
1281         group = ih->group;
1282
1283         if (skb->len == sizeof(*ih)) {
1284                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1285
1286                 if (!max_delay) {
1287                         max_delay = 10 * HZ;
1288                         group = 0;
1289                 }
1290         } else if (skb->len >= sizeof(*ih3)) {
1291                 ih3 = igmpv3_query_hdr(skb);
1292                 if (ih3->nsrcs)
1293                         goto out;
1294
1295                 max_delay = ih3->code ?
1296                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1297         } else {
1298                 goto out;
1299         }
1300
1301         if (!group) {
1302                 saddr.proto = htons(ETH_P_IP);
1303                 saddr.u.ip4 = iph->saddr;
1304
1305                 br_multicast_query_received(br, port, &br->ip4_other_query,
1306                                             &saddr, max_delay);
1307                 goto out;
1308         }
1309
1310         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1311         if (!mp)
1312                 goto out;
1313
1314         max_delay *= br->multicast_last_member_count;
1315
1316         if (mp->mglist &&
1317             (timer_pending(&mp->timer) ?
1318              time_after(mp->timer.expires, now + max_delay) :
1319              try_to_del_timer_sync(&mp->timer) >= 0))
1320                 mod_timer(&mp->timer, now + max_delay);
1321
1322         for (pp = &mp->ports;
1323              (p = mlock_dereference(*pp, br)) != NULL;
1324              pp = &p->next) {
1325                 if (timer_pending(&p->timer) ?
1326                     time_after(p->timer.expires, now + max_delay) :
1327                     try_to_del_timer_sync(&p->timer) >= 0)
1328                         mod_timer(&p->timer, now + max_delay);
1329         }
1330
1331 out:
1332         spin_unlock(&br->multicast_lock);
1333         return err;
1334 }
1335
1336 #if IS_ENABLED(CONFIG_IPV6)
1337 static int br_ip6_multicast_query(struct net_bridge *br,
1338                                   struct net_bridge_port *port,
1339                                   struct sk_buff *skb,
1340                                   u16 vid)
1341 {
1342         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1343         struct mld_msg *mld;
1344         struct net_bridge_mdb_entry *mp;
1345         struct mld2_query *mld2q;
1346         struct net_bridge_port_group *p;
1347         struct net_bridge_port_group __rcu **pp;
1348         struct br_ip saddr;
1349         unsigned long max_delay;
1350         unsigned long now = jiffies;
1351         const struct in6_addr *group = NULL;
1352         bool is_general_query;
1353         int err = 0;
1354
1355         spin_lock(&br->multicast_lock);
1356         if (!netif_running(br->dev) ||
1357             (port && port->state == BR_STATE_DISABLED))
1358                 goto out;
1359
1360         if (skb->len == sizeof(*mld)) {
1361                 if (!pskb_may_pull(skb, sizeof(*mld))) {
1362                         err = -EINVAL;
1363                         goto out;
1364                 }
1365                 mld = (struct mld_msg *) icmp6_hdr(skb);
1366                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1367                 if (max_delay)
1368                         group = &mld->mld_mca;
1369         } else {
1370                 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1371                         err = -EINVAL;
1372                         goto out;
1373                 }
1374                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1375                 if (!mld2q->mld2q_nsrcs)
1376                         group = &mld2q->mld2q_mca;
1377
1378                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1379         }
1380
1381         is_general_query = group && ipv6_addr_any(group);
1382
1383         if (is_general_query) {
1384                 saddr.proto = htons(ETH_P_IPV6);
1385                 saddr.u.ip6 = ip6h->saddr;
1386
1387                 br_multicast_query_received(br, port, &br->ip6_other_query,
1388                                             &saddr, max_delay);
1389                 goto out;
1390         } else if (!group) {
1391                 goto out;
1392         }
1393
1394         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1395         if (!mp)
1396                 goto out;
1397
1398         max_delay *= br->multicast_last_member_count;
1399         if (mp->mglist &&
1400             (timer_pending(&mp->timer) ?
1401              time_after(mp->timer.expires, now + max_delay) :
1402              try_to_del_timer_sync(&mp->timer) >= 0))
1403                 mod_timer(&mp->timer, now + max_delay);
1404
1405         for (pp = &mp->ports;
1406              (p = mlock_dereference(*pp, br)) != NULL;
1407              pp = &p->next) {
1408                 if (timer_pending(&p->timer) ?
1409                     time_after(p->timer.expires, now + max_delay) :
1410                     try_to_del_timer_sync(&p->timer) >= 0)
1411                         mod_timer(&p->timer, now + max_delay);
1412         }
1413
1414 out:
1415         spin_unlock(&br->multicast_lock);
1416         return err;
1417 }
1418 #endif
1419
1420 static void
1421 br_multicast_leave_group(struct net_bridge *br,
1422                          struct net_bridge_port *port,
1423                          struct br_ip *group,
1424                          struct bridge_mcast_other_query *other_query,
1425                          struct bridge_mcast_own_query *own_query)
1426 {
1427         struct net_bridge_mdb_htable *mdb;
1428         struct net_bridge_mdb_entry *mp;
1429         struct net_bridge_port_group *p;
1430         unsigned long now;
1431         unsigned long time;
1432
1433         spin_lock(&br->multicast_lock);
1434         if (!netif_running(br->dev) ||
1435             (port && port->state == BR_STATE_DISABLED))
1436                 goto out;
1437
1438         mdb = mlock_dereference(br->mdb, br);
1439         mp = br_mdb_ip_get(mdb, group);
1440         if (!mp)
1441                 goto out;
1442
1443         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1444                 struct net_bridge_port_group __rcu **pp;
1445
1446                 for (pp = &mp->ports;
1447                      (p = mlock_dereference(*pp, br)) != NULL;
1448                      pp = &p->next) {
1449                         if (p->port != port)
1450                                 continue;
1451
1452                         rcu_assign_pointer(*pp, p->next);
1453                         hlist_del_init(&p->mglist);
1454                         del_timer(&p->timer);
1455                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1456                         br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1457                                       p->state);
1458
1459                         if (!mp->ports && !mp->mglist &&
1460                             netif_running(br->dev))
1461                                 mod_timer(&mp->timer, jiffies);
1462                 }
1463                 goto out;
1464         }
1465
1466         if (timer_pending(&other_query->timer))
1467                 goto out;
1468
1469         if (br->multicast_querier) {
1470                 __br_multicast_send_query(br, port, &mp->addr);
1471
1472                 time = jiffies + br->multicast_last_member_count *
1473                                  br->multicast_last_member_interval;
1474
1475                 mod_timer(&own_query->timer, time);
1476
1477                 for (p = mlock_dereference(mp->ports, br);
1478                      p != NULL;
1479                      p = mlock_dereference(p->next, br)) {
1480                         if (p->port != port)
1481                                 continue;
1482
1483                         if (!hlist_unhashed(&p->mglist) &&
1484                             (timer_pending(&p->timer) ?
1485                              time_after(p->timer.expires, time) :
1486                              try_to_del_timer_sync(&p->timer) >= 0)) {
1487                                 mod_timer(&p->timer, time);
1488                         }
1489
1490                         break;
1491                 }
1492         }
1493
1494         now = jiffies;
1495         time = now + br->multicast_last_member_count *
1496                      br->multicast_last_member_interval;
1497
1498         if (!port) {
1499                 if (mp->mglist &&
1500                     (timer_pending(&mp->timer) ?
1501                      time_after(mp->timer.expires, time) :
1502                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1503                         mod_timer(&mp->timer, time);
1504                 }
1505
1506                 goto out;
1507         }
1508
1509         for (p = mlock_dereference(mp->ports, br);
1510              p != NULL;
1511              p = mlock_dereference(p->next, br)) {
1512                 if (p->port != port)
1513                         continue;
1514
1515                 if (!hlist_unhashed(&p->mglist) &&
1516                     (timer_pending(&p->timer) ?
1517                      time_after(p->timer.expires, time) :
1518                      try_to_del_timer_sync(&p->timer) >= 0)) {
1519                         mod_timer(&p->timer, time);
1520                 }
1521
1522                 break;
1523         }
1524 out:
1525         spin_unlock(&br->multicast_lock);
1526 }
1527
1528 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1529                                          struct net_bridge_port *port,
1530                                          __be32 group,
1531                                          __u16 vid)
1532 {
1533         struct br_ip br_group;
1534         struct bridge_mcast_own_query *own_query;
1535
1536         if (ipv4_is_local_multicast(group))
1537                 return;
1538
1539         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1540
1541         br_group.u.ip4 = group;
1542         br_group.proto = htons(ETH_P_IP);
1543         br_group.vid = vid;
1544
1545         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1546                                  own_query);
1547 }
1548
1549 #if IS_ENABLED(CONFIG_IPV6)
1550 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1551                                          struct net_bridge_port *port,
1552                                          const struct in6_addr *group,
1553                                          __u16 vid)
1554 {
1555         struct br_ip br_group;
1556         struct bridge_mcast_own_query *own_query;
1557
1558         if (ipv6_addr_is_ll_all_nodes(group))
1559                 return;
1560
1561         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1562
1563         br_group.u.ip6 = *group;
1564         br_group.proto = htons(ETH_P_IPV6);
1565         br_group.vid = vid;
1566
1567         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1568                                  own_query);
1569 }
1570 #endif
1571
1572 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1573                                  struct net_bridge_port *port,
1574                                  struct sk_buff *skb,
1575                                  u16 vid)
1576 {
1577         struct sk_buff *skb_trimmed = NULL;
1578         struct igmphdr *ih;
1579         int err;
1580
1581         err = ip_mc_check_igmp(skb, &skb_trimmed);
1582
1583         if (err == -ENOMSG) {
1584                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1585                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1586                 return 0;
1587         } else if (err < 0) {
1588                 return err;
1589         }
1590
1591         BR_INPUT_SKB_CB(skb)->igmp = 1;
1592         ih = igmp_hdr(skb);
1593
1594         switch (ih->type) {
1595         case IGMP_HOST_MEMBERSHIP_REPORT:
1596         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1597                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1598                 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1599                 break;
1600         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1601                 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1602                 break;
1603         case IGMP_HOST_MEMBERSHIP_QUERY:
1604                 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1605                 break;
1606         case IGMP_HOST_LEAVE_MESSAGE:
1607                 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1608                 break;
1609         }
1610
1611         if (skb_trimmed && skb_trimmed != skb)
1612                 kfree_skb(skb_trimmed);
1613
1614         return err;
1615 }
1616
1617 #if IS_ENABLED(CONFIG_IPV6)
1618 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1619                                  struct net_bridge_port *port,
1620                                  struct sk_buff *skb,
1621                                  u16 vid)
1622 {
1623         struct sk_buff *skb_trimmed = NULL;
1624         struct mld_msg *mld;
1625         int err;
1626
1627         err = ipv6_mc_check_mld(skb, &skb_trimmed);
1628
1629         if (err == -ENOMSG) {
1630                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1631                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1632                 return 0;
1633         } else if (err < 0) {
1634                 return err;
1635         }
1636
1637         BR_INPUT_SKB_CB(skb)->igmp = 1;
1638         mld = (struct mld_msg *)skb_transport_header(skb);
1639
1640         switch (mld->mld_type) {
1641         case ICMPV6_MGM_REPORT:
1642                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1643                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1644                 break;
1645         case ICMPV6_MLD2_REPORT:
1646                 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1647                 break;
1648         case ICMPV6_MGM_QUERY:
1649                 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1650                 break;
1651         case ICMPV6_MGM_REDUCTION:
1652                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1653                 break;
1654         }
1655
1656         if (skb_trimmed && skb_trimmed != skb)
1657                 kfree_skb(skb_trimmed);
1658
1659         return err;
1660 }
1661 #endif
1662
1663 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1664                      struct sk_buff *skb, u16 vid)
1665 {
1666         BR_INPUT_SKB_CB(skb)->igmp = 0;
1667         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1668
1669         if (br->multicast_disabled)
1670                 return 0;
1671
1672         switch (skb->protocol) {
1673         case htons(ETH_P_IP):
1674                 return br_multicast_ipv4_rcv(br, port, skb, vid);
1675 #if IS_ENABLED(CONFIG_IPV6)
1676         case htons(ETH_P_IPV6):
1677                 return br_multicast_ipv6_rcv(br, port, skb, vid);
1678 #endif
1679         }
1680
1681         return 0;
1682 }
1683
1684 static void br_multicast_query_expired(struct net_bridge *br,
1685                                        struct bridge_mcast_own_query *query,
1686                                        struct bridge_mcast_querier *querier)
1687 {
1688         spin_lock(&br->multicast_lock);
1689         if (query->startup_sent < br->multicast_startup_query_count)
1690                 query->startup_sent++;
1691
1692         RCU_INIT_POINTER(querier->port, NULL);
1693         br_multicast_send_query(br, NULL, query);
1694         spin_unlock(&br->multicast_lock);
1695 }
1696
1697 static void br_ip4_multicast_query_expired(unsigned long data)
1698 {
1699         struct net_bridge *br = (void *)data;
1700
1701         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1702 }
1703
1704 #if IS_ENABLED(CONFIG_IPV6)
1705 static void br_ip6_multicast_query_expired(unsigned long data)
1706 {
1707         struct net_bridge *br = (void *)data;
1708
1709         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1710 }
1711 #endif
1712
1713 void br_multicast_init(struct net_bridge *br)
1714 {
1715         br->hash_elasticity = 4;
1716         br->hash_max = 512;
1717
1718         br->multicast_router = 1;
1719         br->multicast_querier = 0;
1720         br->multicast_query_use_ifaddr = 0;
1721         br->multicast_last_member_count = 2;
1722         br->multicast_startup_query_count = 2;
1723
1724         br->multicast_last_member_interval = HZ;
1725         br->multicast_query_response_interval = 10 * HZ;
1726         br->multicast_startup_query_interval = 125 * HZ / 4;
1727         br->multicast_query_interval = 125 * HZ;
1728         br->multicast_querier_interval = 255 * HZ;
1729         br->multicast_membership_interval = 260 * HZ;
1730
1731         br->ip4_other_query.delay_time = 0;
1732         br->ip4_querier.port = NULL;
1733 #if IS_ENABLED(CONFIG_IPV6)
1734         br->ip6_other_query.delay_time = 0;
1735         br->ip6_querier.port = NULL;
1736 #endif
1737
1738         spin_lock_init(&br->multicast_lock);
1739         setup_timer(&br->multicast_router_timer,
1740                     br_multicast_local_router_expired, 0);
1741         setup_timer(&br->ip4_other_query.timer,
1742                     br_ip4_multicast_querier_expired, (unsigned long)br);
1743         setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1744                     (unsigned long)br);
1745 #if IS_ENABLED(CONFIG_IPV6)
1746         setup_timer(&br->ip6_other_query.timer,
1747                     br_ip6_multicast_querier_expired, (unsigned long)br);
1748         setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1749                     (unsigned long)br);
1750 #endif
1751 }
1752
1753 static void __br_multicast_open(struct net_bridge *br,
1754                                 struct bridge_mcast_own_query *query)
1755 {
1756         query->startup_sent = 0;
1757
1758         if (br->multicast_disabled)
1759                 return;
1760
1761         mod_timer(&query->timer, jiffies);
1762 }
1763
1764 void br_multicast_open(struct net_bridge *br)
1765 {
1766         __br_multicast_open(br, &br->ip4_own_query);
1767 #if IS_ENABLED(CONFIG_IPV6)
1768         __br_multicast_open(br, &br->ip6_own_query);
1769 #endif
1770 }
1771
1772 void br_multicast_stop(struct net_bridge *br)
1773 {
1774         del_timer_sync(&br->multicast_router_timer);
1775         del_timer_sync(&br->ip4_other_query.timer);
1776         del_timer_sync(&br->ip4_own_query.timer);
1777 #if IS_ENABLED(CONFIG_IPV6)
1778         del_timer_sync(&br->ip6_other_query.timer);
1779         del_timer_sync(&br->ip6_own_query.timer);
1780 #endif
1781 }
1782
1783 void br_multicast_dev_del(struct net_bridge *br)
1784 {
1785         struct net_bridge_mdb_htable *mdb;
1786         struct net_bridge_mdb_entry *mp;
1787         struct hlist_node *n;
1788         u32 ver;
1789         int i;
1790
1791         spin_lock_bh(&br->multicast_lock);
1792         mdb = mlock_dereference(br->mdb, br);
1793         if (!mdb)
1794                 goto out;
1795
1796         br->mdb = NULL;
1797
1798         ver = mdb->ver;
1799         for (i = 0; i < mdb->max; i++) {
1800                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1801                                           hlist[ver]) {
1802                         del_timer(&mp->timer);
1803                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
1804                 }
1805         }
1806
1807         if (mdb->old) {
1808                 spin_unlock_bh(&br->multicast_lock);
1809                 rcu_barrier_bh();
1810                 spin_lock_bh(&br->multicast_lock);
1811                 WARN_ON(mdb->old);
1812         }
1813
1814         mdb->old = mdb;
1815         call_rcu_bh(&mdb->rcu, br_mdb_free);
1816
1817 out:
1818         spin_unlock_bh(&br->multicast_lock);
1819 }
1820
1821 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1822 {
1823         int err = -EINVAL;
1824
1825         spin_lock_bh(&br->multicast_lock);
1826
1827         switch (val) {
1828         case 0:
1829         case 2:
1830                 del_timer(&br->multicast_router_timer);
1831                 /* fall through */
1832         case 1:
1833                 br->multicast_router = val;
1834                 err = 0;
1835                 break;
1836         }
1837
1838         spin_unlock_bh(&br->multicast_lock);
1839
1840         return err;
1841 }
1842
1843 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1844 {
1845         struct net_bridge *br = p->br;
1846         int err = -EINVAL;
1847
1848         spin_lock(&br->multicast_lock);
1849
1850         switch (val) {
1851         case 0:
1852         case 1:
1853         case 2:
1854                 p->multicast_router = val;
1855                 err = 0;
1856
1857                 if (val < 2 && !hlist_unhashed(&p->rlist)) {
1858                         hlist_del_init_rcu(&p->rlist);
1859                         br_rtr_notify(br->dev, p, RTM_DELMDB);
1860                 }
1861
1862                 if (val == 1)
1863                         break;
1864
1865                 del_timer(&p->multicast_router_timer);
1866
1867                 if (val == 0)
1868                         break;
1869
1870                 br_multicast_add_router(br, p);
1871                 break;
1872         }
1873
1874         spin_unlock(&br->multicast_lock);
1875
1876         return err;
1877 }
1878
1879 static void br_multicast_start_querier(struct net_bridge *br,
1880                                        struct bridge_mcast_own_query *query)
1881 {
1882         struct net_bridge_port *port;
1883
1884         __br_multicast_open(br, query);
1885
1886         list_for_each_entry(port, &br->port_list, list) {
1887                 if (port->state == BR_STATE_DISABLED ||
1888                     port->state == BR_STATE_BLOCKING)
1889                         continue;
1890
1891                 if (query == &br->ip4_own_query)
1892                         br_multicast_enable(&port->ip4_own_query);
1893 #if IS_ENABLED(CONFIG_IPV6)
1894                 else
1895                         br_multicast_enable(&port->ip6_own_query);
1896 #endif
1897         }
1898 }
1899
1900 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1901 {
1902         int err = 0;
1903         struct net_bridge_mdb_htable *mdb;
1904
1905         spin_lock_bh(&br->multicast_lock);
1906         if (br->multicast_disabled == !val)
1907                 goto unlock;
1908
1909         br->multicast_disabled = !val;
1910         if (br->multicast_disabled)
1911                 goto unlock;
1912
1913         if (!netif_running(br->dev))
1914                 goto unlock;
1915
1916         mdb = mlock_dereference(br->mdb, br);
1917         if (mdb) {
1918                 if (mdb->old) {
1919                         err = -EEXIST;
1920 rollback:
1921                         br->multicast_disabled = !!val;
1922                         goto unlock;
1923                 }
1924
1925                 err = br_mdb_rehash(&br->mdb, mdb->max,
1926                                     br->hash_elasticity);
1927                 if (err)
1928                         goto rollback;
1929         }
1930
1931         br_multicast_start_querier(br, &br->ip4_own_query);
1932 #if IS_ENABLED(CONFIG_IPV6)
1933         br_multicast_start_querier(br, &br->ip6_own_query);
1934 #endif
1935
1936 unlock:
1937         spin_unlock_bh(&br->multicast_lock);
1938
1939         return err;
1940 }
1941
1942 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1943 {
1944         unsigned long max_delay;
1945
1946         val = !!val;
1947
1948         spin_lock_bh(&br->multicast_lock);
1949         if (br->multicast_querier == val)
1950                 goto unlock;
1951
1952         br->multicast_querier = val;
1953         if (!val)
1954                 goto unlock;
1955
1956         max_delay = br->multicast_query_response_interval;
1957
1958         if (!timer_pending(&br->ip4_other_query.timer))
1959                 br->ip4_other_query.delay_time = jiffies + max_delay;
1960
1961         br_multicast_start_querier(br, &br->ip4_own_query);
1962
1963 #if IS_ENABLED(CONFIG_IPV6)
1964         if (!timer_pending(&br->ip6_other_query.timer))
1965                 br->ip6_other_query.delay_time = jiffies + max_delay;
1966
1967         br_multicast_start_querier(br, &br->ip6_own_query);
1968 #endif
1969
1970 unlock:
1971         spin_unlock_bh(&br->multicast_lock);
1972
1973         return 0;
1974 }
1975
1976 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1977 {
1978         int err = -EINVAL;
1979         u32 old;
1980         struct net_bridge_mdb_htable *mdb;
1981
1982         spin_lock_bh(&br->multicast_lock);
1983         if (!is_power_of_2(val))
1984                 goto unlock;
1985
1986         mdb = mlock_dereference(br->mdb, br);
1987         if (mdb && val < mdb->size)
1988                 goto unlock;
1989
1990         err = 0;
1991
1992         old = br->hash_max;
1993         br->hash_max = val;
1994
1995         if (mdb) {
1996                 if (mdb->old) {
1997                         err = -EEXIST;
1998 rollback:
1999                         br->hash_max = old;
2000                         goto unlock;
2001                 }
2002
2003                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2004                                     br->hash_elasticity);
2005                 if (err)
2006                         goto rollback;
2007         }
2008
2009 unlock:
2010         spin_unlock_bh(&br->multicast_lock);
2011
2012         return err;
2013 }
2014
2015 /**
2016  * br_multicast_list_adjacent - Returns snooped multicast addresses
2017  * @dev:        The bridge port adjacent to which to retrieve addresses
2018  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2019  *
2020  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2021  * snooping feature on all bridge ports of dev's bridge device, excluding
2022  * the addresses from dev itself.
2023  *
2024  * Returns the number of items added to br_ip_list.
2025  *
2026  * Notes:
2027  * - br_ip_list needs to be initialized by caller
2028  * - br_ip_list might contain duplicates in the end
2029  *   (needs to be taken care of by caller)
2030  * - br_ip_list needs to be freed by caller
2031  */
2032 int br_multicast_list_adjacent(struct net_device *dev,
2033                                struct list_head *br_ip_list)
2034 {
2035         struct net_bridge *br;
2036         struct net_bridge_port *port;
2037         struct net_bridge_port_group *group;
2038         struct br_ip_list *entry;
2039         int count = 0;
2040
2041         rcu_read_lock();
2042         if (!br_ip_list || !br_port_exists(dev))
2043                 goto unlock;
2044
2045         port = br_port_get_rcu(dev);
2046         if (!port || !port->br)
2047                 goto unlock;
2048
2049         br = port->br;
2050
2051         list_for_each_entry_rcu(port, &br->port_list, list) {
2052                 if (!port->dev || port->dev == dev)
2053                         continue;
2054
2055                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2056                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2057                         if (!entry)
2058                                 goto unlock;
2059
2060                         entry->addr = group->addr;
2061                         list_add(&entry->list, br_ip_list);
2062                         count++;
2063                 }
2064         }
2065
2066 unlock:
2067         rcu_read_unlock();
2068         return count;
2069 }
2070 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2071
2072 /**
2073  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2074  * @dev: The bridge port providing the bridge on which to check for a querier
2075  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2076  *
2077  * Checks whether the given interface has a bridge on top and if so returns
2078  * true if a valid querier exists anywhere on the bridged link layer.
2079  * Otherwise returns false.
2080  */
2081 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2082 {
2083         struct net_bridge *br;
2084         struct net_bridge_port *port;
2085         struct ethhdr eth;
2086         bool ret = false;
2087
2088         rcu_read_lock();
2089         if (!br_port_exists(dev))
2090                 goto unlock;
2091
2092         port = br_port_get_rcu(dev);
2093         if (!port || !port->br)
2094                 goto unlock;
2095
2096         br = port->br;
2097
2098         memset(&eth, 0, sizeof(eth));
2099         eth.h_proto = htons(proto);
2100
2101         ret = br_multicast_querier_exists(br, &eth);
2102
2103 unlock:
2104         rcu_read_unlock();
2105         return ret;
2106 }
2107 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2108
2109 /**
2110  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2111  * @dev: The bridge port adjacent to which to check for a querier
2112  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2113  *
2114  * Checks whether the given interface has a bridge on top and if so returns
2115  * true if a selected querier is behind one of the other ports of this
2116  * bridge. Otherwise returns false.
2117  */
2118 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2119 {
2120         struct net_bridge *br;
2121         struct net_bridge_port *port;
2122         bool ret = false;
2123
2124         rcu_read_lock();
2125         if (!br_port_exists(dev))
2126                 goto unlock;
2127
2128         port = br_port_get_rcu(dev);
2129         if (!port || !port->br)
2130                 goto unlock;
2131
2132         br = port->br;
2133
2134         switch (proto) {
2135         case ETH_P_IP:
2136                 if (!timer_pending(&br->ip4_other_query.timer) ||
2137                     rcu_dereference(br->ip4_querier.port) == port)
2138                         goto unlock;
2139                 break;
2140 #if IS_ENABLED(CONFIG_IPV6)
2141         case ETH_P_IPV6:
2142                 if (!timer_pending(&br->ip6_other_query.timer) ||
2143                     rcu_dereference(br->ip6_querier.port) == port)
2144                         goto unlock;
2145                 break;
2146 #endif
2147         default:
2148                 goto unlock;
2149         }
2150
2151         ret = true;
2152 unlock:
2153         rcu_read_unlock();
2154         return ret;
2155 }
2156 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);