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