kernel/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                 br->has_ipv6_addr = 0;
 468                 return NULL;
 469         }
 470
 471         br->has_ipv6_addr = 1;
 472         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 473
 474         hopopt = (u8 *)(ip6h + 1);
 475         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
 476         hopopt[1] = 0;                          /* length of HbH */
 477         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
 478         hopopt[3] = 2;                          /* Length of RA Option */
 479         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
 480         hopopt[5] = 0;
 481         hopopt[6] = IPV6_TLV_PAD1;              /* Pad1 */
 482         hopopt[7] = IPV6_TLV_PAD1;              /* Pad1 */
 483
 484         skb_put(skb, sizeof(*ip6h) + 8);
 485
 486         /* ICMPv6 */
 487         skb_set_transport_header(skb, skb->len);
 488         mldq = (struct mld_msg *) icmp6_hdr(skb);
 489
 490         interval = ipv6_addr_any(group) ?
 491                         br->multicast_query_response_interval :
 492                         br->multicast_last_member_interval;
 493
 494         mldq->mld_type = ICMPV6_MGM_QUERY;
 495         mldq->mld_code = 0;
 496         mldq->mld_cksum = 0;
 497         mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
 498         mldq->mld_reserved = 0;
 499         mldq->mld_mca = *group;
 500
 501         /* checksum */
 502         mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 503                                           sizeof(*mldq), IPPROTO_ICMPV6,
 504                                           csum_partial(mldq,
 505                                                        sizeof(*mldq), 0));
 506         skb_put(skb, sizeof(*mldq));
 507
 508         __skb_pull(skb, sizeof(*eth));
 509
 510 out:
 511         return skb;
 512 }
 513 #endif
 514
 515 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 516                                                 struct br_ip *addr)
 517 {
 518         switch (addr->proto) {
 519         case htons(ETH_P_IP):
 520                 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
 521 #if IS_ENABLED(CONFIG_IPV6)
 522         case htons(ETH_P_IPV6):
 523                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
 524 #endif
 525         }
 526         return NULL;
 527 }
 528
 529 static struct net_bridge_mdb_entry *br_multicast_get_group(
 530         struct net_bridge *br, struct net_bridge_port *port,
 531         struct br_ip *group, int hash)
 532 {
 533         struct net_bridge_mdb_htable *mdb;
 534         struct net_bridge_mdb_entry *mp;
 535         unsigned int count = 0;
 536         unsigned int max;
 537         int elasticity;
 538         int err;
 539
 540         mdb = rcu_dereference_protected(br->mdb, 1);
 541         hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 542                 count++;
 543                 if (unlikely(br_ip_equal(group, &mp->addr)))
 544                         return mp;
 545         }
 546
 547         elasticity = 0;
 548         max = mdb->max;
 549
 550         if (unlikely(count > br->hash_elasticity && count)) {
 551                 if (net_ratelimit())
 552                         br_info(br, "Multicast hash table "
 553                                 "chain limit reached: %s\n",
 554                                 port ? port->dev->name : br->dev->name);
 555
 556                 elasticity = br->hash_elasticity;
 557         }
 558
 559         if (mdb->size >= max) {
 560                 max *= 2;
 561                 if (unlikely(max > br->hash_max)) {
 562                         br_warn(br, "Multicast hash table maximum of %d "
 563                                 "reached, disabling snooping: %s\n",
 564                                 br->hash_max,
 565                                 port ? port->dev->name : br->dev->name);
 566                         err = -E2BIG;
 567 disable:
 568                         br->multicast_disabled = 1;
 569                         goto err;
 570                 }
 571         }
 572
 573         if (max > mdb->max || elasticity) {
 574                 if (mdb->old) {
 575                         if (net_ratelimit())
 576                                 br_info(br, "Multicast hash table "
 577                                         "on fire: %s\n",
 578                                         port ? port->dev->name : br->dev->name);
 579                         err = -EEXIST;
 580                         goto err;
 581                 }
 582
 583                 err = br_mdb_rehash(&br->mdb, max, elasticity);
 584                 if (err) {
 585                         br_warn(br, "Cannot rehash multicast "
 586                                 "hash table, disabling snooping: %s, %d, %d\n",
 587                                 port ? port->dev->name : br->dev->name,
 588                                 mdb->size, err);
 589                         goto disable;
 590                 }
 591
 592                 err = -EAGAIN;
 593                 goto err;
 594         }
 595
 596         return NULL;
 597
 598 err:
 599         mp = ERR_PTR(err);
 600         return mp;
 601 }
 602
 603 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 604         struct net_bridge_port *port, struct br_ip *group)
 605 {
 606         struct net_bridge_mdb_htable *mdb;
 607         struct net_bridge_mdb_entry *mp;
 608         int hash;
 609         int err;
 610
 611         mdb = rcu_dereference_protected(br->mdb, 1);
 612         if (!mdb) {
 613                 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
 614                 if (err)
 615                         return ERR_PTR(err);
 616                 goto rehash;
 617         }
 618
 619         hash = br_ip_hash(mdb, group);
 620         mp = br_multicast_get_group(br, port, group, hash);
 621         switch (PTR_ERR(mp)) {
 622         case 0:
 623                 break;
 624
 625         case -EAGAIN:
 626 rehash:
 627                 mdb = rcu_dereference_protected(br->mdb, 1);
 628                 hash = br_ip_hash(mdb, group);
 629                 break;
 630
 631         default:
 632                 goto out;
 633         }
 634
 635         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 636         if (unlikely(!mp))
 637                 return ERR_PTR(-ENOMEM);
 638
 639         mp->br = br;
 640         mp->addr = *group;
 641         setup_timer(&mp->timer, br_multicast_group_expired,
 642                     (unsigned long)mp);
 643
 644         hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
 645         mdb->size++;
 646
 647 out:
 648         return mp;
 649 }
 650
 651 struct net_bridge_port_group *br_multicast_new_port_group(
 652                         struct net_bridge_port *port,
 653                         struct br_ip *group,
 654                         struct net_bridge_port_group __rcu *next,
 655                         unsigned char state)
 656 {
 657         struct net_bridge_port_group *p;
 658
 659         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 660         if (unlikely(!p))
 661                 return NULL;
 662
 663         p->addr = *group;
 664         p->port = port;
 665         p->state = state;
 666         rcu_assign_pointer(p->next, next);
 667         hlist_add_head(&p->mglist, &port->mglist);
 668         setup_timer(&p->timer, br_multicast_port_group_expired,
 669                     (unsigned long)p);
 670         return p;
 671 }
 672
 673 static int br_multicast_add_group(struct net_bridge *br,
 674                                   struct net_bridge_port *port,
 675                                   struct br_ip *group)
 676 {
 677         struct net_bridge_mdb_entry *mp;
 678         struct net_bridge_port_group *p;
 679         struct net_bridge_port_group __rcu **pp;
 680         unsigned long now = jiffies;
 681         int err;
 682
 683         spin_lock(&br->multicast_lock);
 684         if (!netif_running(br->dev) ||
 685             (port && port->state == BR_STATE_DISABLED))
 686                 goto out;
 687
 688         mp = br_multicast_new_group(br, port, group);
 689         err = PTR_ERR(mp);
 690         if (IS_ERR(mp))
 691                 goto err;
 692
 693         if (!port) {
 694                 mp->mglist = true;
 695                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
 696                 goto out;
 697         }
 698
 699         for (pp = &mp->ports;
 700              (p = mlock_dereference(*pp, br)) != NULL;
 701              pp = &p->next) {
 702                 if (p->port == port)
 703                         goto found;
 704                 if ((unsigned long)p->port < (unsigned long)port)
 705                         break;
 706         }
 707
 708         p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
 709         if (unlikely(!p))
 710                 goto err;
 711         rcu_assign_pointer(*pp, p);
 712         br_mdb_notify(br->dev, port, group, RTM_NEWMDB, MDB_TEMPORARY);
 713
 714 found:
 715         mod_timer(&p->timer, now + br->multicast_membership_interval);
 716 out:
 717         err = 0;
 718
 719 err:
 720         spin_unlock(&br->multicast_lock);
 721         return err;
 722 }
 723
 724 static int br_ip4_multicast_add_group(struct net_bridge *br,
 725                                       struct net_bridge_port *port,
 726                                       __be32 group,
 727                                       __u16 vid)
 728 {
 729         struct br_ip br_group;
 730
 731         if (ipv4_is_local_multicast(group))
 732                 return 0;
 733
 734         br_group.u.ip4 = group;
 735         br_group.proto = htons(ETH_P_IP);
 736         br_group.vid = vid;
 737
 738         return br_multicast_add_group(br, port, &br_group);
 739 }
 740
 741 #if IS_ENABLED(CONFIG_IPV6)
 742 static int br_ip6_multicast_add_group(struct net_bridge *br,
 743                                       struct net_bridge_port *port,
 744                                       const struct in6_addr *group,
 745                                       __u16 vid)
 746 {
 747         struct br_ip br_group;
 748
 749         if (ipv6_addr_is_ll_all_nodes(group))
 750                 return 0;
 751
 752         br_group.u.ip6 = *group;
 753         br_group.proto = htons(ETH_P_IPV6);
 754         br_group.vid = vid;
 755
 756         return br_multicast_add_group(br, port, &br_group);
 757 }
 758 #endif
 759
 760 static void br_multicast_router_expired(unsigned long data)
 761 {
 762         struct net_bridge_port *port = (void *)data;
 763         struct net_bridge *br = port->br;
 764
 765         spin_lock(&br->multicast_lock);
 766         if (port->multicast_router != 1 ||
 767             timer_pending(&port->multicast_router_timer) ||
 768             hlist_unhashed(&port->rlist))
 769                 goto out;
 770
 771         hlist_del_init_rcu(&port->rlist);
 772         br_rtr_notify(br->dev, port, RTM_DELMDB);
 773
 774 out:
 775         spin_unlock(&br->multicast_lock);
 776 }
 777
 778 static void br_multicast_local_router_expired(unsigned long data)
 779 {
 780 }
 781
 782 static void br_multicast_querier_expired(struct net_bridge *br,
 783                                          struct bridge_mcast_own_query *query)
 784 {
 785         spin_lock(&br->multicast_lock);
 786         if (!netif_running(br->dev) || br->multicast_disabled)
 787                 goto out;
 788
 789         br_multicast_start_querier(br, query);
 790
 791 out:
 792         spin_unlock(&br->multicast_lock);
 793 }
 794
 795 static void br_ip4_multicast_querier_expired(unsigned long data)
 796 {
 797         struct net_bridge *br = (void *)data;
 798
 799         br_multicast_querier_expired(br, &br->ip4_own_query);
 800 }
 801
 802 #if IS_ENABLED(CONFIG_IPV6)
 803 static void br_ip6_multicast_querier_expired(unsigned long data)
 804 {
 805         struct net_bridge *br = (void *)data;
 806
 807         br_multicast_querier_expired(br, &br->ip6_own_query);
 808 }
 809 #endif
 810
 811 static void br_multicast_select_own_querier(struct net_bridge *br,
 812                                             struct br_ip *ip,
 813                                             struct sk_buff *skb)
 814 {
 815         if (ip->proto == htons(ETH_P_IP))
 816                 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
 817 #if IS_ENABLED(CONFIG_IPV6)
 818         else
 819                 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
 820 #endif
 821 }
 822
 823 static void __br_multicast_send_query(struct net_bridge *br,
 824                                       struct net_bridge_port *port,
 825                                       struct br_ip *ip)
 826 {
 827         struct sk_buff *skb;
 828
 829         skb = br_multicast_alloc_query(br, ip);
 830         if (!skb)
 831                 return;
 832
 833         if (port) {
 834                 skb->dev = port->dev;
 835                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
 836                         dev_net(port->dev), NULL, skb, NULL, skb->dev,
 837                         br_dev_queue_push_xmit);
 838         } else {
 839                 br_multicast_select_own_querier(br, ip, skb);
 840                 netif_rx(skb);
 841         }
 842 }
 843
 844 static void br_multicast_send_query(struct net_bridge *br,
 845                                     struct net_bridge_port *port,
 846                                     struct bridge_mcast_own_query *own_query)
 847 {
 848         unsigned long time;
 849         struct br_ip br_group;
 850         struct bridge_mcast_other_query *other_query = NULL;
 851
 852         if (!netif_running(br->dev) || br->multicast_disabled ||
 853             !br->multicast_querier)
 854                 return;
 855
 856         memset(&br_group.u, 0, sizeof(br_group.u));
 857
 858         if (port ? (own_query == &port->ip4_own_query) :
 859                    (own_query == &br->ip4_own_query)) {
 860                 other_query = &br->ip4_other_query;
 861                 br_group.proto = htons(ETH_P_IP);
 862 #if IS_ENABLED(CONFIG_IPV6)
 863         } else {
 864                 other_query = &br->ip6_other_query;
 865                 br_group.proto = htons(ETH_P_IPV6);
 866 #endif
 867         }
 868
 869         if (!other_query || timer_pending(&other_query->timer))
 870                 return;
 871
 872         __br_multicast_send_query(br, port, &br_group);
 873
 874         time = jiffies;
 875         time += own_query->startup_sent < br->multicast_startup_query_count ?
 876                 br->multicast_startup_query_interval :
 877                 br->multicast_query_interval;
 878         mod_timer(&own_query->timer, time);
 879 }
 880
 881 static void
 882 br_multicast_port_query_expired(struct net_bridge_port *port,
 883                                 struct bridge_mcast_own_query *query)
 884 {
 885         struct net_bridge *br = port->br;
 886
 887         spin_lock(&br->multicast_lock);
 888         if (port->state == BR_STATE_DISABLED ||
 889             port->state == BR_STATE_BLOCKING)
 890                 goto out;
 891
 892         if (query->startup_sent < br->multicast_startup_query_count)
 893                 query->startup_sent++;
 894
 895         br_multicast_send_query(port->br, port, query);
 896
 897 out:
 898         spin_unlock(&br->multicast_lock);
 899 }
 900
 901 static void br_ip4_multicast_port_query_expired(unsigned long data)
 902 {
 903         struct net_bridge_port *port = (void *)data;
 904
 905         br_multicast_port_query_expired(port, &port->ip4_own_query);
 906 }
 907
 908 #if IS_ENABLED(CONFIG_IPV6)
 909 static void br_ip6_multicast_port_query_expired(unsigned long data)
 910 {
 911         struct net_bridge_port *port = (void *)data;
 912
 913         br_multicast_port_query_expired(port, &port->ip6_own_query);
 914 }
 915 #endif
 916
 917 void br_multicast_add_port(struct net_bridge_port *port)
 918 {
 919         port->multicast_router = 1;
 920
 921         setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
 922                     (unsigned long)port);
 923         setup_timer(&port->ip4_own_query.timer,
 924                     br_ip4_multicast_port_query_expired, (unsigned long)port);
 925 #if IS_ENABLED(CONFIG_IPV6)
 926         setup_timer(&port->ip6_own_query.timer,
 927                     br_ip6_multicast_port_query_expired, (unsigned long)port);
 928 #endif
 929 }
 930
 931 void br_multicast_del_port(struct net_bridge_port *port)
 932 {
 933         struct net_bridge *br = port->br;
 934         struct net_bridge_port_group *pg;
 935         struct hlist_node *n;
 936
 937         /* Take care of the remaining groups, only perm ones should be left */
 938         spin_lock_bh(&br->multicast_lock);
 939         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 940                 br_multicast_del_pg(br, pg);
 941         spin_unlock_bh(&br->multicast_lock);
 942         del_timer_sync(&port->multicast_router_timer);
 943 }
 944
 945 static void br_multicast_enable(struct bridge_mcast_own_query *query)
 946 {
 947         query->startup_sent = 0;
 948
 949         if (try_to_del_timer_sync(&query->timer) >= 0 ||
 950             del_timer(&query->timer))
 951                 mod_timer(&query->timer, jiffies);
 952 }
 953
 954 static void __br_multicast_enable_port(struct net_bridge_port *port)
 955 {
 956         struct net_bridge *br = port->br;
 957
 958         if (br->multicast_disabled || !netif_running(br->dev))
 959                 return;
 960
 961         br_multicast_enable(&port->ip4_own_query);
 962 #if IS_ENABLED(CONFIG_IPV6)
 963         br_multicast_enable(&port->ip6_own_query);
 964 #endif
 965         if (port->multicast_router == 2 && hlist_unhashed(&port->rlist))
 966                 br_multicast_add_router(br, port);
 967 }
 968
 969 void br_multicast_enable_port(struct net_bridge_port *port)
 970 {
 971         struct net_bridge *br = port->br;
 972
 973         spin_lock(&br->multicast_lock);
 974         __br_multicast_enable_port(port);
 975         spin_unlock(&br->multicast_lock);
 976 }
 977
 978 void br_multicast_disable_port(struct net_bridge_port *port)
 979 {
 980         struct net_bridge *br = port->br;
 981         struct net_bridge_port_group *pg;
 982         struct hlist_node *n;
 983
 984         spin_lock(&br->multicast_lock);
 985         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 986                 if (pg->state == MDB_TEMPORARY)
 987                         br_multicast_del_pg(br, pg);
 988
 989         if (!hlist_unhashed(&port->rlist)) {
 990                 hlist_del_init_rcu(&port->rlist);
 991                 br_rtr_notify(br->dev, port, RTM_DELMDB);
 992         }
 993         del_timer(&port->multicast_router_timer);
 994         del_timer(&port->ip4_own_query.timer);
 995 #if IS_ENABLED(CONFIG_IPV6)
 996         del_timer(&port->ip6_own_query.timer);
 997 #endif
 998         spin_unlock(&br->multicast_lock);
 999 }
1000
1001 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1002                                          struct net_bridge_port *port,
1003                                          struct sk_buff *skb,
1004                                          u16 vid)
1005 {
1006         struct igmpv3_report *ih;
1007         struct igmpv3_grec *grec;
1008         int i;
1009         int len;
1010         int num;
1011         int type;
1012         int err = 0;
1013         __be32 group;
1014
1015         ih = igmpv3_report_hdr(skb);
1016         num = ntohs(ih->ngrec);
1017         len = skb_transport_offset(skb) + sizeof(*ih);
1018
1019         for (i = 0; i < num; i++) {
1020                 len += sizeof(*grec);
1021                 if (!pskb_may_pull(skb, len))
1022                         return -EINVAL;
1023
1024                 grec = (void *)(skb->data + len - sizeof(*grec));
1025                 group = grec->grec_mca;
1026                 type = grec->grec_type;
1027
1028                 len += ntohs(grec->grec_nsrcs) * 4;
1029                 if (!pskb_may_pull(skb, len))
1030                         return -EINVAL;
1031
1032                 /* We treat this as an IGMPv2 report for now. */
1033                 switch (type) {
1034                 case IGMPV3_MODE_IS_INCLUDE:
1035                 case IGMPV3_MODE_IS_EXCLUDE:
1036                 case IGMPV3_CHANGE_TO_INCLUDE:
1037                 case IGMPV3_CHANGE_TO_EXCLUDE:
1038                 case IGMPV3_ALLOW_NEW_SOURCES:
1039                 case IGMPV3_BLOCK_OLD_SOURCES:
1040                         break;
1041
1042                 default:
1043                         continue;
1044                 }
1045
1046                 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1047                      type == IGMPV3_MODE_IS_INCLUDE) &&
1048                     ntohs(grec->grec_nsrcs) == 0) {
1049                         br_ip4_multicast_leave_group(br, port, group, vid);
1050                 } else {
1051                         err = br_ip4_multicast_add_group(br, port, group, vid);
1052                         if (err)
1053                                 break;
1054                 }
1055         }
1056
1057         return err;
1058 }
1059
1060 #if IS_ENABLED(CONFIG_IPV6)
1061 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1062                                         struct net_bridge_port *port,
1063                                         struct sk_buff *skb,
1064                                         u16 vid)
1065 {
1066         struct icmp6hdr *icmp6h;
1067         struct mld2_grec *grec;
1068         int i;
1069         int len;
1070         int num;
1071         int err = 0;
1072
1073         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1074                 return -EINVAL;
1075
1076         icmp6h = icmp6_hdr(skb);
1077         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1078         len = skb_transport_offset(skb) + sizeof(*icmp6h);
1079
1080         for (i = 0; i < num; i++) {
1081                 __be16 *nsrcs, _nsrcs;
1082
1083                 nsrcs = skb_header_pointer(skb,
1084                                            len + offsetof(struct mld2_grec,
1085                                                           grec_nsrcs),
1086                                            sizeof(_nsrcs), &_nsrcs);
1087                 if (!nsrcs)
1088                         return -EINVAL;
1089
1090                 if (!pskb_may_pull(skb,
1091                                    len + sizeof(*grec) +
1092                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
1093                         return -EINVAL;
1094
1095                 grec = (struct mld2_grec *)(skb->data + len);
1096                 len += sizeof(*grec) +
1097                        sizeof(struct in6_addr) * ntohs(*nsrcs);
1098
1099                 /* We treat these as MLDv1 reports for now. */
1100                 switch (grec->grec_type) {
1101                 case MLD2_MODE_IS_INCLUDE:
1102                 case MLD2_MODE_IS_EXCLUDE:
1103                 case MLD2_CHANGE_TO_INCLUDE:
1104                 case MLD2_CHANGE_TO_EXCLUDE:
1105                 case MLD2_ALLOW_NEW_SOURCES:
1106                 case MLD2_BLOCK_OLD_SOURCES:
1107                         break;
1108
1109                 default:
1110                         continue;
1111                 }
1112
1113                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1114                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1115                     ntohs(*nsrcs) == 0) {
1116                         br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1117                                                      vid);
1118                 } else {
1119                         err = br_ip6_multicast_add_group(br, port,
1120                                                          &grec->grec_mca, vid);
1121                         if (err)
1122                                 break;
1123                 }
1124         }
1125
1126         return err;
1127 }
1128 #endif
1129
1130 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1131                                             struct net_bridge_port *port,
1132                                             __be32 saddr)
1133 {
1134         if (!timer_pending(&br->ip4_own_query.timer) &&
1135             !timer_pending(&br->ip4_other_query.timer))
1136                 goto update;
1137
1138         if (!br->ip4_querier.addr.u.ip4)
1139                 goto update;
1140
1141         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1142                 goto update;
1143
1144         return false;
1145
1146 update:
1147         br->ip4_querier.addr.u.ip4 = saddr;
1148
1149         /* update protected by general multicast_lock by caller */
1150         rcu_assign_pointer(br->ip4_querier.port, port);
1151
1152         return true;
1153 }
1154
1155 #if IS_ENABLED(CONFIG_IPV6)
1156 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1157                                             struct net_bridge_port *port,
1158                                             struct in6_addr *saddr)
1159 {
1160         if (!timer_pending(&br->ip6_own_query.timer) &&
1161             !timer_pending(&br->ip6_other_query.timer))
1162                 goto update;
1163
1164         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1165                 goto update;
1166
1167         return false;
1168
1169 update:
1170         br->ip6_querier.addr.u.ip6 = *saddr;
1171
1172         /* update protected by general multicast_lock by caller */
1173         rcu_assign_pointer(br->ip6_querier.port, port);
1174
1175         return true;
1176 }
1177 #endif
1178
1179 static bool br_multicast_select_querier(struct net_bridge *br,
1180                                         struct net_bridge_port *port,
1181                                         struct br_ip *saddr)
1182 {
1183         switch (saddr->proto) {
1184         case htons(ETH_P_IP):
1185                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1186 #if IS_ENABLED(CONFIG_IPV6)
1187         case htons(ETH_P_IPV6):
1188                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1189 #endif
1190         }
1191
1192         return false;
1193 }
1194
1195 static void
1196 br_multicast_update_query_timer(struct net_bridge *br,
1197                                 struct bridge_mcast_other_query *query,
1198                                 unsigned long max_delay)
1199 {
1200         if (!timer_pending(&query->timer))
1201                 query->delay_time = jiffies + max_delay;
1202
1203         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1204 }
1205
1206 /*
1207  * Add port to router_list
1208  *  list is maintained ordered by pointer value
1209  *  and locked by br->multicast_lock and RCU
1210  */
1211 static void br_multicast_add_router(struct net_bridge *br,
1212                                     struct net_bridge_port *port)
1213 {
1214         struct net_bridge_port *p;
1215         struct hlist_node *slot = NULL;
1216
1217         if (!hlist_unhashed(&port->rlist))
1218                 return;
1219
1220         hlist_for_each_entry(p, &br->router_list, rlist) {
1221                 if ((unsigned long) port >= (unsigned long) p)
1222                         break;
1223                 slot = &p->rlist;
1224         }
1225
1226         if (slot)
1227                 hlist_add_behind_rcu(&port->rlist, slot);
1228         else
1229                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1230         br_rtr_notify(br->dev, port, RTM_NEWMDB);
1231 }
1232
1233 static void br_multicast_mark_router(struct net_bridge *br,
1234                                      struct net_bridge_port *port)
1235 {
1236         unsigned long now = jiffies;
1237
1238         if (!port) {
1239                 if (br->multicast_router == 1)
1240                         mod_timer(&br->multicast_router_timer,
1241                                   now + br->multicast_querier_interval);
1242                 return;
1243         }
1244
1245         if (port->multicast_router != 1)
1246                 return;
1247
1248         br_multicast_add_router(br, port);
1249
1250         mod_timer(&port->multicast_router_timer,
1251                   now + br->multicast_querier_interval);
1252 }
1253
1254 static void br_multicast_query_received(struct net_bridge *br,
1255                                         struct net_bridge_port *port,
1256                                         struct bridge_mcast_other_query *query,
1257                                         struct br_ip *saddr,
1258                                         unsigned long max_delay)
1259 {
1260         if (!br_multicast_select_querier(br, port, saddr))
1261                 return;
1262
1263         br_multicast_update_query_timer(br, query, max_delay);
1264         br_multicast_mark_router(br, port);
1265 }
1266
1267 static int br_ip4_multicast_query(struct net_bridge *br,
1268                                   struct net_bridge_port *port,
1269                                   struct sk_buff *skb,
1270                                   u16 vid)
1271 {
1272         const struct iphdr *iph = ip_hdr(skb);
1273         struct igmphdr *ih = igmp_hdr(skb);
1274         struct net_bridge_mdb_entry *mp;
1275         struct igmpv3_query *ih3;
1276         struct net_bridge_port_group *p;
1277         struct net_bridge_port_group __rcu **pp;
1278         struct br_ip saddr;
1279         unsigned long max_delay;
1280         unsigned long now = jiffies;
1281         unsigned int offset = skb_transport_offset(skb);
1282         __be32 group;
1283         int err = 0;
1284
1285         spin_lock(&br->multicast_lock);
1286         if (!netif_running(br->dev) ||
1287             (port && port->state == BR_STATE_DISABLED))
1288                 goto out;
1289
1290         group = ih->group;
1291
1292         if (skb->len == offset + sizeof(*ih)) {
1293                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1294
1295                 if (!max_delay) {
1296                         max_delay = 10 * HZ;
1297                         group = 0;
1298                 }
1299         } else if (skb->len >= offset + sizeof(*ih3)) {
1300                 ih3 = igmpv3_query_hdr(skb);
1301                 if (ih3->nsrcs)
1302                         goto out;
1303
1304                 max_delay = ih3->code ?
1305                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1306         } else {
1307                 goto out;
1308         }
1309
1310         if (!group) {
1311                 saddr.proto = htons(ETH_P_IP);
1312                 saddr.u.ip4 = iph->saddr;
1313
1314                 br_multicast_query_received(br, port, &br->ip4_other_query,
1315                                             &saddr, max_delay);
1316                 goto out;
1317         }
1318
1319         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1320         if (!mp)
1321                 goto out;
1322
1323         max_delay *= br->multicast_last_member_count;
1324
1325         if (mp->mglist &&
1326             (timer_pending(&mp->timer) ?
1327              time_after(mp->timer.expires, now + max_delay) :
1328              try_to_del_timer_sync(&mp->timer) >= 0))
1329                 mod_timer(&mp->timer, now + max_delay);
1330
1331         for (pp = &mp->ports;
1332              (p = mlock_dereference(*pp, br)) != NULL;
1333              pp = &p->next) {
1334                 if (timer_pending(&p->timer) ?
1335                     time_after(p->timer.expires, now + max_delay) :
1336                     try_to_del_timer_sync(&p->timer) >= 0)
1337                         mod_timer(&p->timer, now + max_delay);
1338         }
1339
1340 out:
1341         spin_unlock(&br->multicast_lock);
1342         return err;
1343 }
1344
1345 #if IS_ENABLED(CONFIG_IPV6)
1346 static int br_ip6_multicast_query(struct net_bridge *br,
1347                                   struct net_bridge_port *port,
1348                                   struct sk_buff *skb,
1349                                   u16 vid)
1350 {
1351         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1352         struct mld_msg *mld;
1353         struct net_bridge_mdb_entry *mp;
1354         struct mld2_query *mld2q;
1355         struct net_bridge_port_group *p;
1356         struct net_bridge_port_group __rcu **pp;
1357         struct br_ip saddr;
1358         unsigned long max_delay;
1359         unsigned long now = jiffies;
1360         unsigned int offset = skb_transport_offset(skb);
1361         const struct in6_addr *group = NULL;
1362         bool is_general_query;
1363         int err = 0;
1364
1365         spin_lock(&br->multicast_lock);
1366         if (!netif_running(br->dev) ||
1367             (port && port->state == BR_STATE_DISABLED))
1368                 goto out;
1369
1370         if (skb->len == offset + sizeof(*mld)) {
1371                 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1372                         err = -EINVAL;
1373                         goto out;
1374                 }
1375                 mld = (struct mld_msg *) icmp6_hdr(skb);
1376                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1377                 if (max_delay)
1378                         group = &mld->mld_mca;
1379         } else {
1380                 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1381                         err = -EINVAL;
1382                         goto out;
1383                 }
1384                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1385                 if (!mld2q->mld2q_nsrcs)
1386                         group = &mld2q->mld2q_mca;
1387
1388                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1389         }
1390
1391         is_general_query = group && ipv6_addr_any(group);
1392
1393         if (is_general_query) {
1394                 saddr.proto = htons(ETH_P_IPV6);
1395                 saddr.u.ip6 = ip6h->saddr;
1396
1397                 br_multicast_query_received(br, port, &br->ip6_other_query,
1398                                             &saddr, max_delay);
1399                 goto out;
1400         } else if (!group) {
1401                 goto out;
1402         }
1403
1404         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1405         if (!mp)
1406                 goto out;
1407
1408         max_delay *= br->multicast_last_member_count;
1409         if (mp->mglist &&
1410             (timer_pending(&mp->timer) ?
1411              time_after(mp->timer.expires, now + max_delay) :
1412              try_to_del_timer_sync(&mp->timer) >= 0))
1413                 mod_timer(&mp->timer, now + max_delay);
1414
1415         for (pp = &mp->ports;
1416              (p = mlock_dereference(*pp, br)) != NULL;
1417              pp = &p->next) {
1418                 if (timer_pending(&p->timer) ?
1419                     time_after(p->timer.expires, now + max_delay) :
1420                     try_to_del_timer_sync(&p->timer) >= 0)
1421                         mod_timer(&p->timer, now + max_delay);
1422         }
1423
1424 out:
1425         spin_unlock(&br->multicast_lock);
1426         return err;
1427 }
1428 #endif
1429
1430 static void
1431 br_multicast_leave_group(struct net_bridge *br,
1432                          struct net_bridge_port *port,
1433                          struct br_ip *group,
1434                          struct bridge_mcast_other_query *other_query,
1435                          struct bridge_mcast_own_query *own_query)
1436 {
1437         struct net_bridge_mdb_htable *mdb;
1438         struct net_bridge_mdb_entry *mp;
1439         struct net_bridge_port_group *p;
1440         unsigned long now;
1441         unsigned long time;
1442
1443         spin_lock(&br->multicast_lock);
1444         if (!netif_running(br->dev) ||
1445             (port && port->state == BR_STATE_DISABLED))
1446                 goto out;
1447
1448         mdb = mlock_dereference(br->mdb, br);
1449         mp = br_mdb_ip_get(mdb, group);
1450         if (!mp)
1451                 goto out;
1452
1453         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1454                 struct net_bridge_port_group __rcu **pp;
1455
1456                 for (pp = &mp->ports;
1457                      (p = mlock_dereference(*pp, br)) != NULL;
1458                      pp = &p->next) {
1459                         if (p->port != port)
1460                                 continue;
1461
1462                         rcu_assign_pointer(*pp, p->next);
1463                         hlist_del_init(&p->mglist);
1464                         del_timer(&p->timer);
1465                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1466                         br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1467                                       p->state);
1468
1469                         if (!mp->ports && !mp->mglist &&
1470                             netif_running(br->dev))
1471                                 mod_timer(&mp->timer, jiffies);
1472                 }
1473                 goto out;
1474         }
1475
1476         if (timer_pending(&other_query->timer))
1477                 goto out;
1478
1479         if (br->multicast_querier) {
1480                 __br_multicast_send_query(br, port, &mp->addr);
1481
1482                 time = jiffies + br->multicast_last_member_count *
1483                                  br->multicast_last_member_interval;
1484
1485                 mod_timer(&own_query->timer, time);
1486
1487                 for (p = mlock_dereference(mp->ports, br);
1488                      p != NULL;
1489                      p = mlock_dereference(p->next, br)) {
1490                         if (p->port != port)
1491                                 continue;
1492
1493                         if (!hlist_unhashed(&p->mglist) &&
1494                             (timer_pending(&p->timer) ?
1495                              time_after(p->timer.expires, time) :
1496                              try_to_del_timer_sync(&p->timer) >= 0)) {
1497                                 mod_timer(&p->timer, time);
1498                         }
1499
1500                         break;
1501                 }
1502         }
1503
1504         now = jiffies;
1505         time = now + br->multicast_last_member_count *
1506                      br->multicast_last_member_interval;
1507
1508         if (!port) {
1509                 if (mp->mglist &&
1510                     (timer_pending(&mp->timer) ?
1511                      time_after(mp->timer.expires, time) :
1512                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1513                         mod_timer(&mp->timer, time);
1514                 }
1515
1516                 goto out;
1517         }
1518
1519         for (p = mlock_dereference(mp->ports, br);
1520              p != NULL;
1521              p = mlock_dereference(p->next, br)) {
1522                 if (p->port != port)
1523                         continue;
1524
1525                 if (!hlist_unhashed(&p->mglist) &&
1526                     (timer_pending(&p->timer) ?
1527                      time_after(p->timer.expires, time) :
1528                      try_to_del_timer_sync(&p->timer) >= 0)) {
1529                         mod_timer(&p->timer, time);
1530                 }
1531
1532                 break;
1533         }
1534 out:
1535         spin_unlock(&br->multicast_lock);
1536 }
1537
1538 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1539                                          struct net_bridge_port *port,
1540                                          __be32 group,
1541                                          __u16 vid)
1542 {
1543         struct br_ip br_group;
1544         struct bridge_mcast_own_query *own_query;
1545
1546         if (ipv4_is_local_multicast(group))
1547                 return;
1548
1549         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1550
1551         br_group.u.ip4 = group;
1552         br_group.proto = htons(ETH_P_IP);
1553         br_group.vid = vid;
1554
1555         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1556                                  own_query);
1557 }
1558
1559 #if IS_ENABLED(CONFIG_IPV6)
1560 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1561                                          struct net_bridge_port *port,
1562                                          const struct in6_addr *group,
1563                                          __u16 vid)
1564 {
1565         struct br_ip br_group;
1566         struct bridge_mcast_own_query *own_query;
1567
1568         if (ipv6_addr_is_ll_all_nodes(group))
1569                 return;
1570
1571         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1572
1573         br_group.u.ip6 = *group;
1574         br_group.proto = htons(ETH_P_IPV6);
1575         br_group.vid = vid;
1576
1577         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1578                                  own_query);
1579 }
1580 #endif
1581
1582 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1583                                  struct net_bridge_port *port,
1584                                  struct sk_buff *skb,
1585                                  u16 vid)
1586 {
1587         struct sk_buff *skb_trimmed = NULL;
1588         struct igmphdr *ih;
1589         int err;
1590
1591         err = ip_mc_check_igmp(skb, &skb_trimmed);
1592
1593         if (err == -ENOMSG) {
1594                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1595                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1596                 return 0;
1597         } else if (err < 0) {
1598                 return err;
1599         }
1600
1601         BR_INPUT_SKB_CB(skb)->igmp = 1;
1602         ih = igmp_hdr(skb);
1603
1604         switch (ih->type) {
1605         case IGMP_HOST_MEMBERSHIP_REPORT:
1606         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1607                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1608                 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1609                 break;
1610         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1611                 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1612                 break;
1613         case IGMP_HOST_MEMBERSHIP_QUERY:
1614                 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1615                 break;
1616         case IGMP_HOST_LEAVE_MESSAGE:
1617                 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1618                 break;
1619         }
1620
1621         if (skb_trimmed && skb_trimmed != skb)
1622                 kfree_skb(skb_trimmed);
1623
1624         return err;
1625 }
1626
1627 #if IS_ENABLED(CONFIG_IPV6)
1628 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1629                                  struct net_bridge_port *port,
1630                                  struct sk_buff *skb,
1631                                  u16 vid)
1632 {
1633         struct sk_buff *skb_trimmed = NULL;
1634         struct mld_msg *mld;
1635         int err;
1636
1637         err = ipv6_mc_check_mld(skb, &skb_trimmed);
1638
1639         if (err == -ENOMSG) {
1640                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1641                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1642                 return 0;
1643         } else if (err < 0) {
1644                 return err;
1645         }
1646
1647         BR_INPUT_SKB_CB(skb)->igmp = 1;
1648         mld = (struct mld_msg *)skb_transport_header(skb);
1649
1650         switch (mld->mld_type) {
1651         case ICMPV6_MGM_REPORT:
1652                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1653                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1654                 break;
1655         case ICMPV6_MLD2_REPORT:
1656                 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1657                 break;
1658         case ICMPV6_MGM_QUERY:
1659                 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1660                 break;
1661         case ICMPV6_MGM_REDUCTION:
1662                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1663                 break;
1664         }
1665
1666         if (skb_trimmed && skb_trimmed != skb)
1667                 kfree_skb(skb_trimmed);
1668
1669         return err;
1670 }
1671 #endif
1672
1673 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1674                      struct sk_buff *skb, u16 vid)
1675 {
1676         BR_INPUT_SKB_CB(skb)->igmp = 0;
1677         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1678
1679         if (br->multicast_disabled)
1680                 return 0;
1681
1682         switch (skb->protocol) {
1683         case htons(ETH_P_IP):
1684                 return br_multicast_ipv4_rcv(br, port, skb, vid);
1685 #if IS_ENABLED(CONFIG_IPV6)
1686         case htons(ETH_P_IPV6):
1687                 return br_multicast_ipv6_rcv(br, port, skb, vid);
1688 #endif
1689         }
1690
1691         return 0;
1692 }
1693
1694 static void br_multicast_query_expired(struct net_bridge *br,
1695                                        struct bridge_mcast_own_query *query,
1696                                        struct bridge_mcast_querier *querier)
1697 {
1698         spin_lock(&br->multicast_lock);
1699         if (query->startup_sent < br->multicast_startup_query_count)
1700                 query->startup_sent++;
1701
1702         RCU_INIT_POINTER(querier->port, NULL);
1703         br_multicast_send_query(br, NULL, query);
1704         spin_unlock(&br->multicast_lock);
1705 }
1706
1707 static void br_ip4_multicast_query_expired(unsigned long data)
1708 {
1709         struct net_bridge *br = (void *)data;
1710
1711         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1712 }
1713
1714 #if IS_ENABLED(CONFIG_IPV6)
1715 static void br_ip6_multicast_query_expired(unsigned long data)
1716 {
1717         struct net_bridge *br = (void *)data;
1718
1719         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1720 }
1721 #endif
1722
1723 void br_multicast_init(struct net_bridge *br)
1724 {
1725         br->hash_elasticity = 4;
1726         br->hash_max = 512;
1727
1728         br->multicast_router = 1;
1729         br->multicast_querier = 0;
1730         br->multicast_query_use_ifaddr = 0;
1731         br->multicast_last_member_count = 2;
1732         br->multicast_startup_query_count = 2;
1733
1734         br->multicast_last_member_interval = HZ;
1735         br->multicast_query_response_interval = 10 * HZ;
1736         br->multicast_startup_query_interval = 125 * HZ / 4;
1737         br->multicast_query_interval = 125 * HZ;
1738         br->multicast_querier_interval = 255 * HZ;
1739         br->multicast_membership_interval = 260 * HZ;
1740
1741         br->ip4_other_query.delay_time = 0;
1742         br->ip4_querier.port = NULL;
1743 #if IS_ENABLED(CONFIG_IPV6)
1744         br->ip6_other_query.delay_time = 0;
1745         br->ip6_querier.port = NULL;
1746 #endif
1747         br->has_ipv6_addr = 1;
1748
1749         spin_lock_init(&br->multicast_lock);
1750         setup_timer(&br->multicast_router_timer,
1751                     br_multicast_local_router_expired, 0);
1752         setup_timer(&br->ip4_other_query.timer,
1753                     br_ip4_multicast_querier_expired, (unsigned long)br);
1754         setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1755                     (unsigned long)br);
1756 #if IS_ENABLED(CONFIG_IPV6)
1757         setup_timer(&br->ip6_other_query.timer,
1758                     br_ip6_multicast_querier_expired, (unsigned long)br);
1759         setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1760                     (unsigned long)br);
1761 #endif
1762 }
1763
1764 static void __br_multicast_open(struct net_bridge *br,
1765                                 struct bridge_mcast_own_query *query)
1766 {
1767         query->startup_sent = 0;
1768
1769         if (br->multicast_disabled)
1770                 return;
1771
1772         mod_timer(&query->timer, jiffies);
1773 }
1774
1775 void br_multicast_open(struct net_bridge *br)
1776 {
1777         __br_multicast_open(br, &br->ip4_own_query);
1778 #if IS_ENABLED(CONFIG_IPV6)
1779         __br_multicast_open(br, &br->ip6_own_query);
1780 #endif
1781 }
1782
1783 void br_multicast_stop(struct net_bridge *br)
1784 {
1785         del_timer_sync(&br->multicast_router_timer);
1786         del_timer_sync(&br->ip4_other_query.timer);
1787         del_timer_sync(&br->ip4_own_query.timer);
1788 #if IS_ENABLED(CONFIG_IPV6)
1789         del_timer_sync(&br->ip6_other_query.timer);
1790         del_timer_sync(&br->ip6_own_query.timer);
1791 #endif
1792 }
1793
1794 void br_multicast_dev_del(struct net_bridge *br)
1795 {
1796         struct net_bridge_mdb_htable *mdb;
1797         struct net_bridge_mdb_entry *mp;
1798         struct hlist_node *n;
1799         u32 ver;
1800         int i;
1801
1802         spin_lock_bh(&br->multicast_lock);
1803         mdb = mlock_dereference(br->mdb, br);
1804         if (!mdb)
1805                 goto out;
1806
1807         br->mdb = NULL;
1808
1809         ver = mdb->ver;
1810         for (i = 0; i < mdb->max; i++) {
1811                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1812                                           hlist[ver]) {
1813                         del_timer(&mp->timer);
1814                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
1815                 }
1816         }
1817
1818         if (mdb->old) {
1819                 spin_unlock_bh(&br->multicast_lock);
1820                 rcu_barrier_bh();
1821                 spin_lock_bh(&br->multicast_lock);
1822                 WARN_ON(mdb->old);
1823         }
1824
1825         mdb->old = mdb;
1826         call_rcu_bh(&mdb->rcu, br_mdb_free);
1827
1828 out:
1829         spin_unlock_bh(&br->multicast_lock);
1830 }
1831
1832 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1833 {
1834         int err = -EINVAL;
1835
1836         spin_lock_bh(&br->multicast_lock);
1837
1838         switch (val) {
1839         case 0:
1840         case 2:
1841                 del_timer(&br->multicast_router_timer);
1842                 /* fall through */
1843         case 1:
1844                 br->multicast_router = val;
1845                 err = 0;
1846                 break;
1847         }
1848
1849         spin_unlock_bh(&br->multicast_lock);
1850
1851         return err;
1852 }
1853
1854 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1855 {
1856         struct net_bridge *br = p->br;
1857         int err = -EINVAL;
1858
1859         spin_lock(&br->multicast_lock);
1860
1861         switch (val) {
1862         case 0:
1863         case 1:
1864         case 2:
1865                 p->multicast_router = val;
1866                 err = 0;
1867
1868                 if (val < 2 && !hlist_unhashed(&p->rlist)) {
1869                         hlist_del_init_rcu(&p->rlist);
1870                         br_rtr_notify(br->dev, p, RTM_DELMDB);
1871                 }
1872
1873                 if (val == 1)
1874                         break;
1875
1876                 del_timer(&p->multicast_router_timer);
1877
1878                 if (val == 0)
1879                         break;
1880
1881                 br_multicast_add_router(br, p);
1882                 break;
1883         }
1884
1885         spin_unlock(&br->multicast_lock);
1886
1887         return err;
1888 }
1889
1890 static void br_multicast_start_querier(struct net_bridge *br,
1891                                        struct bridge_mcast_own_query *query)
1892 {
1893         struct net_bridge_port *port;
1894
1895         __br_multicast_open(br, query);
1896
1897         list_for_each_entry(port, &br->port_list, list) {
1898                 if (port->state == BR_STATE_DISABLED ||
1899                     port->state == BR_STATE_BLOCKING)
1900                         continue;
1901
1902                 if (query == &br->ip4_own_query)
1903                         br_multicast_enable(&port->ip4_own_query);
1904 #if IS_ENABLED(CONFIG_IPV6)
1905                 else
1906                         br_multicast_enable(&port->ip6_own_query);
1907 #endif
1908         }
1909 }
1910
1911 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1912 {
1913         struct net_bridge_mdb_htable *mdb;
1914         struct net_bridge_port *port;
1915         int err = 0;
1916
1917         spin_lock_bh(&br->multicast_lock);
1918         if (br->multicast_disabled == !val)
1919                 goto unlock;
1920
1921         br->multicast_disabled = !val;
1922         if (br->multicast_disabled)
1923                 goto unlock;
1924
1925         if (!netif_running(br->dev))
1926                 goto unlock;
1927
1928         mdb = mlock_dereference(br->mdb, br);
1929         if (mdb) {
1930                 if (mdb->old) {
1931                         err = -EEXIST;
1932 rollback:
1933                         br->multicast_disabled = !!val;
1934                         goto unlock;
1935                 }
1936
1937                 err = br_mdb_rehash(&br->mdb, mdb->max,
1938                                     br->hash_elasticity);
1939                 if (err)
1940                         goto rollback;
1941         }
1942
1943         br_multicast_open(br);
1944         list_for_each_entry(port, &br->port_list, list)
1945                 __br_multicast_enable_port(port);
1946
1947 unlock:
1948         spin_unlock_bh(&br->multicast_lock);
1949
1950         return err;
1951 }
1952
1953 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1954 {
1955         unsigned long max_delay;
1956
1957         val = !!val;
1958
1959         spin_lock_bh(&br->multicast_lock);
1960         if (br->multicast_querier == val)
1961                 goto unlock;
1962
1963         br->multicast_querier = val;
1964         if (!val)
1965                 goto unlock;
1966
1967         max_delay = br->multicast_query_response_interval;
1968
1969         if (!timer_pending(&br->ip4_other_query.timer))
1970                 br->ip4_other_query.delay_time = jiffies + max_delay;
1971
1972         br_multicast_start_querier(br, &br->ip4_own_query);
1973
1974 #if IS_ENABLED(CONFIG_IPV6)
1975         if (!timer_pending(&br->ip6_other_query.timer))
1976                 br->ip6_other_query.delay_time = jiffies + max_delay;
1977
1978         br_multicast_start_querier(br, &br->ip6_own_query);
1979 #endif
1980
1981 unlock:
1982         spin_unlock_bh(&br->multicast_lock);
1983
1984         return 0;
1985 }
1986
1987 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1988 {
1989         int err = -EINVAL;
1990         u32 old;
1991         struct net_bridge_mdb_htable *mdb;
1992
1993         spin_lock_bh(&br->multicast_lock);
1994         if (!is_power_of_2(val))
1995                 goto unlock;
1996
1997         mdb = mlock_dereference(br->mdb, br);
1998         if (mdb && val < mdb->size)
1999                 goto unlock;
2000
2001         err = 0;
2002
2003         old = br->hash_max;
2004         br->hash_max = val;
2005
2006         if (mdb) {
2007                 if (mdb->old) {
2008                         err = -EEXIST;
2009 rollback:
2010                         br->hash_max = old;
2011                         goto unlock;
2012                 }
2013
2014                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2015                                     br->hash_elasticity);
2016                 if (err)
2017                         goto rollback;
2018         }
2019
2020 unlock:
2021         spin_unlock_bh(&br->multicast_lock);
2022
2023         return err;
2024 }
2025
2026 /**
2027  * br_multicast_list_adjacent - Returns snooped multicast addresses
2028  * @dev:        The bridge port adjacent to which to retrieve addresses
2029  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2030  *
2031  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2032  * snooping feature on all bridge ports of dev's bridge device, excluding
2033  * the addresses from dev itself.
2034  *
2035  * Returns the number of items added to br_ip_list.
2036  *
2037  * Notes:
2038  * - br_ip_list needs to be initialized by caller
2039  * - br_ip_list might contain duplicates in the end
2040  *   (needs to be taken care of by caller)
2041  * - br_ip_list needs to be freed by caller
2042  */
2043 int br_multicast_list_adjacent(struct net_device *dev,
2044                                struct list_head *br_ip_list)
2045 {
2046         struct net_bridge *br;
2047         struct net_bridge_port *port;
2048         struct net_bridge_port_group *group;
2049         struct br_ip_list *entry;
2050         int count = 0;
2051
2052         rcu_read_lock();
2053         if (!br_ip_list || !br_port_exists(dev))
2054                 goto unlock;
2055
2056         port = br_port_get_rcu(dev);
2057         if (!port || !port->br)
2058                 goto unlock;
2059
2060         br = port->br;
2061
2062         list_for_each_entry_rcu(port, &br->port_list, list) {
2063                 if (!port->dev || port->dev == dev)
2064                         continue;
2065
2066                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2067                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2068                         if (!entry)
2069                                 goto unlock;
2070
2071                         entry->addr = group->addr;
2072                         list_add(&entry->list, br_ip_list);
2073                         count++;
2074                 }
2075         }
2076
2077 unlock:
2078         rcu_read_unlock();
2079         return count;
2080 }
2081 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2082
2083 /**
2084  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2085  * @dev: The bridge port providing the bridge on which to check for a querier
2086  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2087  *
2088  * Checks whether the given interface has a bridge on top and if so returns
2089  * true if a valid querier exists anywhere on the bridged link layer.
2090  * Otherwise returns false.
2091  */
2092 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2093 {
2094         struct net_bridge *br;
2095         struct net_bridge_port *port;
2096         struct ethhdr eth;
2097         bool ret = false;
2098
2099         rcu_read_lock();
2100         if (!br_port_exists(dev))
2101                 goto unlock;
2102
2103         port = br_port_get_rcu(dev);
2104         if (!port || !port->br)
2105                 goto unlock;
2106
2107         br = port->br;
2108
2109         memset(&eth, 0, sizeof(eth));
2110         eth.h_proto = htons(proto);
2111
2112         ret = br_multicast_querier_exists(br, &eth);
2113
2114 unlock:
2115         rcu_read_unlock();
2116         return ret;
2117 }
2118 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2119
2120 /**
2121  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2122  * @dev: The bridge port adjacent to which to check for a querier
2123  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2124  *
2125  * Checks whether the given interface has a bridge on top and if so returns
2126  * true if a selected querier is behind one of the other ports of this
2127  * bridge. Otherwise returns false.
2128  */
2129 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2130 {
2131         struct net_bridge *br;
2132         struct net_bridge_port *port;
2133         bool ret = false;
2134
2135         rcu_read_lock();
2136         if (!br_port_exists(dev))
2137                 goto unlock;
2138
2139         port = br_port_get_rcu(dev);
2140         if (!port || !port->br)
2141                 goto unlock;
2142
2143         br = port->br;
2144
2145         switch (proto) {
2146         case ETH_P_IP:
2147                 if (!timer_pending(&br->ip4_other_query.timer) ||
2148                     rcu_dereference(br->ip4_querier.port) == port)
2149                         goto unlock;
2150                 break;
2151 #if IS_ENABLED(CONFIG_IPV6)
2152         case ETH_P_IPV6:
2153                 if (!timer_pending(&br->ip6_other_query.timer) ||
2154                     rcu_dereference(br->ip6_querier.port) == port)
2155                         goto unlock;
2156                 break;
2157 #endif
2158         default:
2159                 goto unlock;
2160         }
2161
2162         ret = true;
2163 unlock:
2164         rcu_read_unlock();
2165         return ret;
2166 }
2167 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);