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 unsigned int br_mdb_rehash_seq;
  41
  42 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
  43 {
  44         if (a->proto != b->proto)
  45                 return 0;
  46         if (a->vid != b->vid)
  47                 return 0;
  48         switch (a->proto) {
  49         case htons(ETH_P_IP):
  50                 return a->u.ip4 == b->u.ip4;
  51 #if IS_ENABLED(CONFIG_IPV6)
  52         case htons(ETH_P_IPV6):
  53                 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
  54 #endif
  55         }
  56         return 0;
  57 }
  58
  59 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
  60                                 __u16 vid)
  61 {
  62         return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
  63 }
  64
  65 #if IS_ENABLED(CONFIG_IPV6)
  66 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
  67                                 const struct in6_addr *ip,
  68                                 __u16 vid)
  69 {
  70         return jhash_2words(ipv6_addr_hash(ip), vid,
  71                             mdb->secret) & (mdb->max - 1);
  72 }
  73 #endif
  74
  75 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
  76                              struct br_ip *ip)
  77 {
  78         switch (ip->proto) {
  79         case htons(ETH_P_IP):
  80                 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
  81 #if IS_ENABLED(CONFIG_IPV6)
  82         case htons(ETH_P_IPV6):
  83                 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
  84 #endif
  85         }
  86         return 0;
  87 }
  88
  89 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
  90         struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
  91 {
  92         struct net_bridge_mdb_entry *mp;
  93
  94         hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
  95                 if (br_ip_equal(&mp->addr, dst))
  96                         return mp;
  97         }
  98
  99         return NULL;
 100 }
 101
 102 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
 103                                            struct br_ip *dst)
 104 {
 105         if (!mdb)
 106                 return NULL;
 107
 108         return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
 109 }
 110
 111 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
 112         struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
 113 {
 114         struct br_ip br_dst;
 115
 116         br_dst.u.ip4 = dst;
 117         br_dst.proto = htons(ETH_P_IP);
 118         br_dst.vid = vid;
 119
 120         return br_mdb_ip_get(mdb, &br_dst);
 121 }
 122
 123 #if IS_ENABLED(CONFIG_IPV6)
 124 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
 125         struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
 126         __u16 vid)
 127 {
 128         struct br_ip br_dst;
 129
 130         br_dst.u.ip6 = *dst;
 131         br_dst.proto = htons(ETH_P_IPV6);
 132         br_dst.vid = vid;
 133
 134         return br_mdb_ip_get(mdb, &br_dst);
 135 }
 136 #endif
 137
 138 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 139                                         struct sk_buff *skb, u16 vid)
 140 {
 141         struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
 142         struct br_ip ip;
 143
 144         if (br->multicast_disabled)
 145                 return NULL;
 146
 147         if (BR_INPUT_SKB_CB(skb)->igmp)
 148                 return NULL;
 149
 150         ip.proto = skb->protocol;
 151         ip.vid = vid;
 152
 153         switch (skb->protocol) {
 154         case htons(ETH_P_IP):
 155                 ip.u.ip4 = ip_hdr(skb)->daddr;
 156                 break;
 157 #if IS_ENABLED(CONFIG_IPV6)
 158         case htons(ETH_P_IPV6):
 159                 ip.u.ip6 = ipv6_hdr(skb)->daddr;
 160                 break;
 161 #endif
 162         default:
 163                 return NULL;
 164         }
 165
 166         return br_mdb_ip_get(mdb, &ip);
 167 }
 168
 169 static void br_mdb_free(struct rcu_head *head)
 170 {
 171         struct net_bridge_mdb_htable *mdb =
 172                 container_of(head, struct net_bridge_mdb_htable, rcu);
 173         struct net_bridge_mdb_htable *old = mdb->old;
 174
 175         mdb->old = NULL;
 176         kfree(old->mhash);
 177         kfree(old);
 178 }
 179
 180 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
 181                        struct net_bridge_mdb_htable *old,
 182                        int elasticity)
 183 {
 184         struct net_bridge_mdb_entry *mp;
 185         int maxlen;
 186         int len;
 187         int i;
 188
 189         for (i = 0; i < old->max; i++)
 190                 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
 191                         hlist_add_head(&mp->hlist[new->ver],
 192                                        &new->mhash[br_ip_hash(new, &mp->addr)]);
 193
 194         if (!elasticity)
 195                 return 0;
 196
 197         maxlen = 0;
 198         for (i = 0; i < new->max; i++) {
 199                 len = 0;
 200                 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
 201                         len++;
 202                 if (len > maxlen)
 203                         maxlen = len;
 204         }
 205
 206         return maxlen > elasticity ? -EINVAL : 0;
 207 }
 208
 209 void br_multicast_free_pg(struct rcu_head *head)
 210 {
 211         struct net_bridge_port_group *p =
 212                 container_of(head, struct net_bridge_port_group, rcu);
 213
 214         kfree(p);
 215 }
 216
 217 static void br_multicast_free_group(struct rcu_head *head)
 218 {
 219         struct net_bridge_mdb_entry *mp =
 220                 container_of(head, struct net_bridge_mdb_entry, rcu);
 221
 222         kfree(mp);
 223 }
 224
 225 static void br_multicast_group_expired(unsigned long data)
 226 {
 227         struct net_bridge_mdb_entry *mp = (void *)data;
 228         struct net_bridge *br = mp->br;
 229         struct net_bridge_mdb_htable *mdb;
 230
 231         spin_lock(&br->multicast_lock);
 232         if (!netif_running(br->dev) || timer_pending(&mp->timer))
 233                 goto out;
 234
 235         mp->mglist = false;
 236
 237         if (mp->ports)
 238                 goto out;
 239
 240         mdb = mlock_dereference(br->mdb, br);
 241
 242         hlist_del_rcu(&mp->hlist[mdb->ver]);
 243         mdb->size--;
 244
 245         call_rcu_bh(&mp->rcu, br_multicast_free_group);
 246
 247 out:
 248         spin_unlock(&br->multicast_lock);
 249 }
 250
 251 static void br_multicast_del_pg(struct net_bridge *br,
 252                                 struct net_bridge_port_group *pg)
 253 {
 254         struct net_bridge_mdb_htable *mdb;
 255         struct net_bridge_mdb_entry *mp;
 256         struct net_bridge_port_group *p;
 257         struct net_bridge_port_group __rcu **pp;
 258
 259         mdb = mlock_dereference(br->mdb, br);
 260
 261         mp = br_mdb_ip_get(mdb, &pg->addr);
 262         if (WARN_ON(!mp))
 263                 return;
 264
 265         for (pp = &mp->ports;
 266              (p = mlock_dereference(*pp, br)) != NULL;
 267              pp = &p->next) {
 268                 if (p != pg)
 269                         continue;
 270
 271                 rcu_assign_pointer(*pp, p->next);
 272                 hlist_del_init(&p->mglist);
 273                 del_timer(&p->timer);
 274                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
 275
 276                 if (!mp->ports && !mp->mglist &&
 277                     netif_running(br->dev))
 278                         mod_timer(&mp->timer, jiffies);
 279
 280                 return;
 281         }
 282
 283         WARN_ON(1);
 284 }
 285
 286 static void br_multicast_port_group_expired(unsigned long data)
 287 {
 288         struct net_bridge_port_group *pg = (void *)data;
 289         struct net_bridge *br = pg->port->br;
 290
 291         spin_lock(&br->multicast_lock);
 292         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
 293             hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
 294                 goto out;
 295
 296         br_multicast_del_pg(br, pg);
 297
 298 out:
 299         spin_unlock(&br->multicast_lock);
 300 }
 301
 302 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
 303                          int elasticity)
 304 {
 305         struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
 306         struct net_bridge_mdb_htable *mdb;
 307         int err;
 308
 309         mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
 310         if (!mdb)
 311                 return -ENOMEM;
 312
 313         mdb->max = max;
 314         mdb->old = old;
 315
 316         mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
 317         if (!mdb->mhash) {
 318                 kfree(mdb);
 319                 return -ENOMEM;
 320         }
 321
 322         mdb->size = old ? old->size : 0;
 323         mdb->ver = old ? old->ver ^ 1 : 0;
 324
 325         if (!old || elasticity)
 326                 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
 327         else
 328                 mdb->secret = old->secret;
 329
 330         if (!old)
 331                 goto out;
 332
 333         err = br_mdb_copy(mdb, old, elasticity);
 334         if (err) {
 335                 kfree(mdb->mhash);
 336                 kfree(mdb);
 337                 return err;
 338         }
 339
 340         br_mdb_rehash_seq++;
 341         call_rcu_bh(&mdb->rcu, br_mdb_free);
 342
 343 out:
 344         rcu_assign_pointer(*mdbp, mdb);
 345
 346         return 0;
 347 }
 348
 349 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
 350                                                     __be32 group)
 351 {
 352         struct sk_buff *skb;
 353         struct igmphdr *ih;
 354         struct ethhdr *eth;
 355         struct iphdr *iph;
 356
 357         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
 358                                                  sizeof(*ih) + 4);
 359         if (!skb)
 360                 goto out;
 361
 362         skb->protocol = htons(ETH_P_IP);
 363
 364         skb_reset_mac_header(skb);
 365         eth = eth_hdr(skb);
 366
 367         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 368         eth->h_dest[0] = 1;
 369         eth->h_dest[1] = 0;
 370         eth->h_dest[2] = 0x5e;
 371         eth->h_dest[3] = 0;
 372         eth->h_dest[4] = 0;
 373         eth->h_dest[5] = 1;
 374         eth->h_proto = htons(ETH_P_IP);
 375         skb_put(skb, sizeof(*eth));
 376
 377         skb_set_network_header(skb, skb->len);
 378         iph = ip_hdr(skb);
 379
 380         iph->version = 4;
 381         iph->ihl = 6;
 382         iph->tos = 0xc0;
 383         iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
 384         iph->id = 0;
 385         iph->frag_off = htons(IP_DF);
 386         iph->ttl = 1;
 387         iph->protocol = IPPROTO_IGMP;
 388         iph->saddr = br->multicast_query_use_ifaddr ?
 389                      inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
 390         iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 391         ((u8 *)&iph[1])[0] = IPOPT_RA;
 392         ((u8 *)&iph[1])[1] = 4;
 393         ((u8 *)&iph[1])[2] = 0;
 394         ((u8 *)&iph[1])[3] = 0;
 395         ip_send_check(iph);
 396         skb_put(skb, 24);
 397
 398         skb_set_transport_header(skb, skb->len);
 399         ih = igmp_hdr(skb);
 400         ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
 401         ih->code = (group ? br->multicast_last_member_interval :
 402                             br->multicast_query_response_interval) /
 403                    (HZ / IGMP_TIMER_SCALE);
 404         ih->group = group;
 405         ih->csum = 0;
 406         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 407         skb_put(skb, sizeof(*ih));
 408
 409         __skb_pull(skb, sizeof(*eth));
 410
 411 out:
 412         return skb;
 413 }
 414
 415 #if IS_ENABLED(CONFIG_IPV6)
 416 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
 417                                                     const struct in6_addr *group)
 418 {
 419         struct sk_buff *skb;
 420         struct ipv6hdr *ip6h;
 421         struct mld_msg *mldq;
 422         struct ethhdr *eth;
 423         u8 *hopopt;
 424         unsigned long interval;
 425
 426         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
 427                                                  8 + sizeof(*mldq));
 428         if (!skb)
 429                 goto out;
 430
 431         skb->protocol = htons(ETH_P_IPV6);
 432
 433         /* Ethernet header */
 434         skb_reset_mac_header(skb);
 435         eth = eth_hdr(skb);
 436
 437         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 438         eth->h_proto = htons(ETH_P_IPV6);
 439         skb_put(skb, sizeof(*eth));
 440
 441         /* IPv6 header + HbH option */
 442         skb_set_network_header(skb, skb->len);
 443         ip6h = ipv6_hdr(skb);
 444
 445         *(__force __be32 *)ip6h = htonl(0x60000000);
 446         ip6h->payload_len = htons(8 + sizeof(*mldq));
 447         ip6h->nexthdr = IPPROTO_HOPOPTS;
 448         ip6h->hop_limit = 1;
 449         ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
 450         if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
 451                                &ip6h->saddr)) {
 452                 kfree_skb(skb);
 453                 return NULL;
 454         }
 455         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 456
 457         hopopt = (u8 *)(ip6h + 1);
 458         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
 459         hopopt[1] = 0;                          /* length of HbH */
 460         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
 461         hopopt[3] = 2;                          /* Length of RA Option */
 462         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
 463         hopopt[5] = 0;
 464         hopopt[6] = IPV6_TLV_PAD1;              /* Pad1 */
 465         hopopt[7] = IPV6_TLV_PAD1;              /* Pad1 */
 466
 467         skb_put(skb, sizeof(*ip6h) + 8);
 468
 469         /* ICMPv6 */
 470         skb_set_transport_header(skb, skb->len);
 471         mldq = (struct mld_msg *) icmp6_hdr(skb);
 472
 473         interval = ipv6_addr_any(group) ?
 474                         br->multicast_query_response_interval :
 475                         br->multicast_last_member_interval;
 476
 477         mldq->mld_type = ICMPV6_MGM_QUERY;
 478         mldq->mld_code = 0;
 479         mldq->mld_cksum = 0;
 480         mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
 481         mldq->mld_reserved = 0;
 482         mldq->mld_mca = *group;
 483
 484         /* checksum */
 485         mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 486                                           sizeof(*mldq), IPPROTO_ICMPV6,
 487                                           csum_partial(mldq,
 488                                                        sizeof(*mldq), 0));
 489         skb_put(skb, sizeof(*mldq));
 490
 491         __skb_pull(skb, sizeof(*eth));
 492
 493 out:
 494         return skb;
 495 }
 496 #endif
 497
 498 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 499                                                 struct br_ip *addr)
 500 {
 501         switch (addr->proto) {
 502         case htons(ETH_P_IP):
 503                 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
 504 #if IS_ENABLED(CONFIG_IPV6)
 505         case htons(ETH_P_IPV6):
 506                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
 507 #endif
 508         }
 509         return NULL;
 510 }
 511
 512 static struct net_bridge_mdb_entry *br_multicast_get_group(
 513         struct net_bridge *br, struct net_bridge_port *port,
 514         struct br_ip *group, int hash)
 515 {
 516         struct net_bridge_mdb_htable *mdb;
 517         struct net_bridge_mdb_entry *mp;
 518         unsigned int count = 0;
 519         unsigned int max;
 520         int elasticity;
 521         int err;
 522
 523         mdb = rcu_dereference_protected(br->mdb, 1);
 524         hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 525                 count++;
 526                 if (unlikely(br_ip_equal(group, &mp->addr)))
 527                         return mp;
 528         }
 529
 530         elasticity = 0;
 531         max = mdb->max;
 532
 533         if (unlikely(count > br->hash_elasticity && count)) {
 534                 if (net_ratelimit())
 535                         br_info(br, "Multicast hash table "
 536                                 "chain limit reached: %s\n",
 537                                 port ? port->dev->name : br->dev->name);
 538
 539                 elasticity = br->hash_elasticity;
 540         }
 541
 542         if (mdb->size >= max) {
 543                 max *= 2;
 544                 if (unlikely(max > br->hash_max)) {
 545                         br_warn(br, "Multicast hash table maximum of %d "
 546                                 "reached, disabling snooping: %s\n",
 547                                 br->hash_max,
 548                                 port ? port->dev->name : br->dev->name);
 549                         err = -E2BIG;
 550 disable:
 551                         br->multicast_disabled = 1;
 552                         goto err;
 553                 }
 554         }
 555
 556         if (max > mdb->max || elasticity) {
 557                 if (mdb->old) {
 558                         if (net_ratelimit())
 559                                 br_info(br, "Multicast hash table "
 560                                         "on fire: %s\n",
 561                                         port ? port->dev->name : br->dev->name);
 562                         err = -EEXIST;
 563                         goto err;
 564                 }
 565
 566                 err = br_mdb_rehash(&br->mdb, max, elasticity);
 567                 if (err) {
 568                         br_warn(br, "Cannot rehash multicast "
 569                                 "hash table, disabling snooping: %s, %d, %d\n",
 570                                 port ? port->dev->name : br->dev->name,
 571                                 mdb->size, err);
 572                         goto disable;
 573                 }
 574
 575                 err = -EAGAIN;
 576                 goto err;
 577         }
 578
 579         return NULL;
 580
 581 err:
 582         mp = ERR_PTR(err);
 583         return mp;
 584 }
 585
 586 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 587         struct net_bridge_port *port, struct br_ip *group)
 588 {
 589         struct net_bridge_mdb_htable *mdb;
 590         struct net_bridge_mdb_entry *mp;
 591         int hash;
 592         int err;
 593
 594         mdb = rcu_dereference_protected(br->mdb, 1);
 595         if (!mdb) {
 596                 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
 597                 if (err)
 598                         return ERR_PTR(err);
 599                 goto rehash;
 600         }
 601
 602         hash = br_ip_hash(mdb, group);
 603         mp = br_multicast_get_group(br, port, group, hash);
 604         switch (PTR_ERR(mp)) {
 605         case 0:
 606                 break;
 607
 608         case -EAGAIN:
 609 rehash:
 610                 mdb = rcu_dereference_protected(br->mdb, 1);
 611                 hash = br_ip_hash(mdb, group);
 612                 break;
 613
 614         default:
 615                 goto out;
 616         }
 617
 618         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 619         if (unlikely(!mp))
 620                 return ERR_PTR(-ENOMEM);
 621
 622         mp->br = br;
 623         mp->addr = *group;
 624         setup_timer(&mp->timer, br_multicast_group_expired,
 625                     (unsigned long)mp);
 626
 627         hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
 628         mdb->size++;
 629
 630 out:
 631         return mp;
 632 }
 633
 634 struct net_bridge_port_group *br_multicast_new_port_group(
 635                         struct net_bridge_port *port,
 636                         struct br_ip *group,
 637                         struct net_bridge_port_group __rcu *next,
 638                         unsigned char state)
 639 {
 640         struct net_bridge_port_group *p;
 641
 642         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 643         if (unlikely(!p))
 644                 return NULL;
 645
 646         p->addr = *group;
 647         p->port = port;
 648         p->state = state;
 649         rcu_assign_pointer(p->next, next);
 650         hlist_add_head(&p->mglist, &port->mglist);
 651         setup_timer(&p->timer, br_multicast_port_group_expired,
 652                     (unsigned long)p);
 653         return p;
 654 }
 655
 656 static int br_multicast_add_group(struct net_bridge *br,
 657                                   struct net_bridge_port *port,
 658                                   struct br_ip *group)
 659 {
 660         struct net_bridge_mdb_entry *mp;
 661         struct net_bridge_port_group *p;
 662         struct net_bridge_port_group __rcu **pp;
 663         unsigned long now = jiffies;
 664         int err;
 665
 666         spin_lock(&br->multicast_lock);
 667         if (!netif_running(br->dev) ||
 668             (port && port->state == BR_STATE_DISABLED))
 669                 goto out;
 670
 671         mp = br_multicast_new_group(br, port, group);
 672         err = PTR_ERR(mp);
 673         if (IS_ERR(mp))
 674                 goto err;
 675
 676         if (!port) {
 677                 mp->mglist = true;
 678                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
 679                 goto out;
 680         }
 681
 682         for (pp = &mp->ports;
 683              (p = mlock_dereference(*pp, br)) != NULL;
 684              pp = &p->next) {
 685                 if (p->port == port)
 686                         goto found;
 687                 if ((unsigned long)p->port < (unsigned long)port)
 688                         break;
 689         }
 690
 691         p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
 692         if (unlikely(!p))
 693                 goto err;
 694         rcu_assign_pointer(*pp, p);
 695         br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
 696
 697 found:
 698         mod_timer(&p->timer, now + br->multicast_membership_interval);
 699 out:
 700         err = 0;
 701
 702 err:
 703         spin_unlock(&br->multicast_lock);
 704         return err;
 705 }
 706
 707 static int br_ip4_multicast_add_group(struct net_bridge *br,
 708                                       struct net_bridge_port *port,
 709                                       __be32 group,
 710                                       __u16 vid)
 711 {
 712         struct br_ip br_group;
 713
 714         if (ipv4_is_local_multicast(group))
 715                 return 0;
 716
 717         br_group.u.ip4 = group;
 718         br_group.proto = htons(ETH_P_IP);
 719         br_group.vid = vid;
 720
 721         return br_multicast_add_group(br, port, &br_group);
 722 }
 723
 724 #if IS_ENABLED(CONFIG_IPV6)
 725 static int br_ip6_multicast_add_group(struct net_bridge *br,
 726                                       struct net_bridge_port *port,
 727                                       const struct in6_addr *group,
 728                                       __u16 vid)
 729 {
 730         struct br_ip br_group;
 731
 732         if (ipv6_addr_is_ll_all_nodes(group))
 733                 return 0;
 734
 735         br_group.u.ip6 = *group;
 736         br_group.proto = htons(ETH_P_IPV6);
 737         br_group.vid = vid;
 738
 739         return br_multicast_add_group(br, port, &br_group);
 740 }
 741 #endif
 742
 743 static void br_multicast_router_expired(unsigned long data)
 744 {
 745         struct net_bridge_port *port = (void *)data;
 746         struct net_bridge *br = port->br;
 747
 748         spin_lock(&br->multicast_lock);
 749         if (port->multicast_router != 1 ||
 750             timer_pending(&port->multicast_router_timer) ||
 751             hlist_unhashed(&port->rlist))
 752                 goto out;
 753
 754         hlist_del_init_rcu(&port->rlist);
 755
 756 out:
 757         spin_unlock(&br->multicast_lock);
 758 }
 759
 760 static void br_multicast_local_router_expired(unsigned long data)
 761 {
 762 }
 763
 764 static void br_multicast_querier_expired(struct net_bridge *br,
 765                                          struct bridge_mcast_own_query *query)
 766 {
 767         spin_lock(&br->multicast_lock);
 768         if (!netif_running(br->dev) || br->multicast_disabled)
 769                 goto out;
 770
 771         br_multicast_start_querier(br, query);
 772
 773 out:
 774         spin_unlock(&br->multicast_lock);
 775 }
 776
 777 static void br_ip4_multicast_querier_expired(unsigned long data)
 778 {
 779         struct net_bridge *br = (void *)data;
 780
 781         br_multicast_querier_expired(br, &br->ip4_own_query);
 782 }
 783
 784 #if IS_ENABLED(CONFIG_IPV6)
 785 static void br_ip6_multicast_querier_expired(unsigned long data)
 786 {
 787         struct net_bridge *br = (void *)data;
 788
 789         br_multicast_querier_expired(br, &br->ip6_own_query);
 790 }
 791 #endif
 792
 793 static void br_multicast_select_own_querier(struct net_bridge *br,
 794                                             struct br_ip *ip,
 795                                             struct sk_buff *skb)
 796 {
 797         if (ip->proto == htons(ETH_P_IP))
 798                 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
 799 #if IS_ENABLED(CONFIG_IPV6)
 800         else
 801                 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
 802 #endif
 803 }
 804
 805 static void __br_multicast_send_query(struct net_bridge *br,
 806                                       struct net_bridge_port *port,
 807                                       struct br_ip *ip)
 808 {
 809         struct sk_buff *skb;
 810
 811         skb = br_multicast_alloc_query(br, ip);
 812         if (!skb)
 813                 return;
 814
 815         if (port) {
 816                 __skb_push(skb, sizeof(struct ethhdr));
 817                 skb->dev = port->dev;
 818                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
 819                         dev_queue_xmit);
 820         } else {
 821                 br_multicast_select_own_querier(br, ip, skb);
 822                 netif_rx(skb);
 823         }
 824 }
 825
 826 static void br_multicast_send_query(struct net_bridge *br,
 827                                     struct net_bridge_port *port,
 828                                     struct bridge_mcast_own_query *own_query)
 829 {
 830         unsigned long time;
 831         struct br_ip br_group;
 832         struct bridge_mcast_other_query *other_query = NULL;
 833
 834         if (!netif_running(br->dev) || br->multicast_disabled ||
 835             !br->multicast_querier)
 836                 return;
 837
 838         memset(&br_group.u, 0, sizeof(br_group.u));
 839
 840         if (port ? (own_query == &port->ip4_own_query) :
 841                    (own_query == &br->ip4_own_query)) {
 842                 other_query = &br->ip4_other_query;
 843                 br_group.proto = htons(ETH_P_IP);
 844 #if IS_ENABLED(CONFIG_IPV6)
 845         } else {
 846                 other_query = &br->ip6_other_query;
 847                 br_group.proto = htons(ETH_P_IPV6);
 848 #endif
 849         }
 850
 851         if (!other_query || timer_pending(&other_query->timer))
 852                 return;
 853
 854         __br_multicast_send_query(br, port, &br_group);
 855
 856         time = jiffies;
 857         time += own_query->startup_sent < br->multicast_startup_query_count ?
 858                 br->multicast_startup_query_interval :
 859                 br->multicast_query_interval;
 860         mod_timer(&own_query->timer, time);
 861 }
 862
 863 static void
 864 br_multicast_port_query_expired(struct net_bridge_port *port,
 865                                 struct bridge_mcast_own_query *query)
 866 {
 867         struct net_bridge *br = port->br;
 868
 869         spin_lock(&br->multicast_lock);
 870         if (port->state == BR_STATE_DISABLED ||
 871             port->state == BR_STATE_BLOCKING)
 872                 goto out;
 873
 874         if (query->startup_sent < br->multicast_startup_query_count)
 875                 query->startup_sent++;
 876
 877         br_multicast_send_query(port->br, port, query);
 878
 879 out:
 880         spin_unlock(&br->multicast_lock);
 881 }
 882
 883 static void br_ip4_multicast_port_query_expired(unsigned long data)
 884 {
 885         struct net_bridge_port *port = (void *)data;
 886
 887         br_multicast_port_query_expired(port, &port->ip4_own_query);
 888 }
 889
 890 #if IS_ENABLED(CONFIG_IPV6)
 891 static void br_ip6_multicast_port_query_expired(unsigned long data)
 892 {
 893         struct net_bridge_port *port = (void *)data;
 894
 895         br_multicast_port_query_expired(port, &port->ip6_own_query);
 896 }
 897 #endif
 898
 899 void br_multicast_add_port(struct net_bridge_port *port)
 900 {
 901         port->multicast_router = 1;
 902
 903         setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
 904                     (unsigned long)port);
 905         setup_timer(&port->ip4_own_query.timer,
 906                     br_ip4_multicast_port_query_expired, (unsigned long)port);
 907 #if IS_ENABLED(CONFIG_IPV6)
 908         setup_timer(&port->ip6_own_query.timer,
 909                     br_ip6_multicast_port_query_expired, (unsigned long)port);
 910 #endif
 911 }
 912
 913 void br_multicast_del_port(struct net_bridge_port *port)
 914 {
 915         del_timer_sync(&port->multicast_router_timer);
 916 }
 917
 918 static void br_multicast_enable(struct bridge_mcast_own_query *query)
 919 {
 920         query->startup_sent = 0;
 921
 922         if (try_to_del_timer_sync(&query->timer) >= 0 ||
 923             del_timer(&query->timer))
 924                 mod_timer(&query->timer, jiffies);
 925 }
 926
 927 void br_multicast_enable_port(struct net_bridge_port *port)
 928 {
 929         struct net_bridge *br = port->br;
 930
 931         spin_lock(&br->multicast_lock);
 932         if (br->multicast_disabled || !netif_running(br->dev))
 933                 goto out;
 934
 935         br_multicast_enable(&port->ip4_own_query);
 936 #if IS_ENABLED(CONFIG_IPV6)
 937         br_multicast_enable(&port->ip6_own_query);
 938 #endif
 939
 940 out:
 941         spin_unlock(&br->multicast_lock);
 942 }
 943
 944 void br_multicast_disable_port(struct net_bridge_port *port)
 945 {
 946         struct net_bridge *br = port->br;
 947         struct net_bridge_port_group *pg;
 948         struct hlist_node *n;
 949
 950         spin_lock(&br->multicast_lock);
 951         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 952                 br_multicast_del_pg(br, pg);
 953
 954         if (!hlist_unhashed(&port->rlist))
 955                 hlist_del_init_rcu(&port->rlist);
 956         del_timer(&port->multicast_router_timer);
 957         del_timer(&port->ip4_own_query.timer);
 958 #if IS_ENABLED(CONFIG_IPV6)
 959         del_timer(&port->ip6_own_query.timer);
 960 #endif
 961         spin_unlock(&br->multicast_lock);
 962 }
 963
 964 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
 965                                          struct net_bridge_port *port,
 966                                          struct sk_buff *skb,
 967                                          u16 vid)
 968 {
 969         struct igmpv3_report *ih;
 970         struct igmpv3_grec *grec;
 971         int i;
 972         int len;
 973         int num;
 974         int type;
 975         int err = 0;
 976         __be32 group;
 977
 978         if (!pskb_may_pull(skb, sizeof(*ih)))
 979                 return -EINVAL;
 980
 981         ih = igmpv3_report_hdr(skb);
 982         num = ntohs(ih->ngrec);
 983         len = sizeof(*ih);
 984
 985         for (i = 0; i < num; i++) {
 986                 len += sizeof(*grec);
 987                 if (!pskb_may_pull(skb, len))
 988                         return -EINVAL;
 989
 990                 grec = (void *)(skb->data + len - sizeof(*grec));
 991                 group = grec->grec_mca;
 992                 type = grec->grec_type;
 993
 994                 len += ntohs(grec->grec_nsrcs) * 4;
 995                 if (!pskb_may_pull(skb, len))
 996                         return -EINVAL;
 997
 998                 /* We treat this as an IGMPv2 report for now. */
 999                 switch (type) {
1000                 case IGMPV3_MODE_IS_INCLUDE:
1001                 case IGMPV3_MODE_IS_EXCLUDE:
1002                 case IGMPV3_CHANGE_TO_INCLUDE:
1003                 case IGMPV3_CHANGE_TO_EXCLUDE:
1004                 case IGMPV3_ALLOW_NEW_SOURCES:
1005                 case IGMPV3_BLOCK_OLD_SOURCES:
1006                         break;
1007
1008                 default:
1009                         continue;
1010                 }
1011
1012                 err = br_ip4_multicast_add_group(br, port, group, vid);
1013                 if (err)
1014                         break;
1015         }
1016
1017         return err;
1018 }
1019
1020 #if IS_ENABLED(CONFIG_IPV6)
1021 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1022                                         struct net_bridge_port *port,
1023                                         struct sk_buff *skb,
1024                                         u16 vid)
1025 {
1026         struct icmp6hdr *icmp6h;
1027         struct mld2_grec *grec;
1028         int i;
1029         int len;
1030         int num;
1031         int err = 0;
1032
1033         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1034                 return -EINVAL;
1035
1036         icmp6h = icmp6_hdr(skb);
1037         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1038         len = sizeof(*icmp6h);
1039
1040         for (i = 0; i < num; i++) {
1041                 __be16 *nsrcs, _nsrcs;
1042
1043                 nsrcs = skb_header_pointer(skb,
1044                                            len + offsetof(struct mld2_grec,
1045                                                           grec_nsrcs),
1046                                            sizeof(_nsrcs), &_nsrcs);
1047                 if (!nsrcs)
1048                         return -EINVAL;
1049
1050                 if (!pskb_may_pull(skb,
1051                                    len + sizeof(*grec) +
1052                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
1053                         return -EINVAL;
1054
1055                 grec = (struct mld2_grec *)(skb->data + len);
1056                 len += sizeof(*grec) +
1057                        sizeof(struct in6_addr) * ntohs(*nsrcs);
1058
1059                 /* We treat these as MLDv1 reports for now. */
1060                 switch (grec->grec_type) {
1061                 case MLD2_MODE_IS_INCLUDE:
1062                 case MLD2_MODE_IS_EXCLUDE:
1063                 case MLD2_CHANGE_TO_INCLUDE:
1064                 case MLD2_CHANGE_TO_EXCLUDE:
1065                 case MLD2_ALLOW_NEW_SOURCES:
1066                 case MLD2_BLOCK_OLD_SOURCES:
1067                         break;
1068
1069                 default:
1070                         continue;
1071                 }
1072
1073                 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1074                                                  vid);
1075                 if (!err)
1076                         break;
1077         }
1078
1079         return err;
1080 }
1081 #endif
1082
1083 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1084                                             struct net_bridge_port *port,
1085                                             __be32 saddr)
1086 {
1087         if (!timer_pending(&br->ip4_own_query.timer) &&
1088             !timer_pending(&br->ip4_other_query.timer))
1089                 goto update;
1090
1091         if (!br->ip4_querier.addr.u.ip4)
1092                 goto update;
1093
1094         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1095                 goto update;
1096
1097         return false;
1098
1099 update:
1100         br->ip4_querier.addr.u.ip4 = saddr;
1101
1102         /* update protected by general multicast_lock by caller */
1103         rcu_assign_pointer(br->ip4_querier.port, port);
1104
1105         return true;
1106 }
1107
1108 #if IS_ENABLED(CONFIG_IPV6)
1109 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1110                                             struct net_bridge_port *port,
1111                                             struct in6_addr *saddr)
1112 {
1113         if (!timer_pending(&br->ip6_own_query.timer) &&
1114             !timer_pending(&br->ip6_other_query.timer))
1115                 goto update;
1116
1117         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1118                 goto update;
1119
1120         return false;
1121
1122 update:
1123         br->ip6_querier.addr.u.ip6 = *saddr;
1124
1125         /* update protected by general multicast_lock by caller */
1126         rcu_assign_pointer(br->ip6_querier.port, port);
1127
1128         return true;
1129 }
1130 #endif
1131
1132 static bool br_multicast_select_querier(struct net_bridge *br,
1133                                         struct net_bridge_port *port,
1134                                         struct br_ip *saddr)
1135 {
1136         switch (saddr->proto) {
1137         case htons(ETH_P_IP):
1138                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1139 #if IS_ENABLED(CONFIG_IPV6)
1140         case htons(ETH_P_IPV6):
1141                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1142 #endif
1143         }
1144
1145         return false;
1146 }
1147
1148 static void
1149 br_multicast_update_query_timer(struct net_bridge *br,
1150                                 struct bridge_mcast_other_query *query,
1151                                 unsigned long max_delay)
1152 {
1153         if (!timer_pending(&query->timer))
1154                 query->delay_time = jiffies + max_delay;
1155
1156         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1157 }
1158
1159 /*
1160  * Add port to router_list
1161  *  list is maintained ordered by pointer value
1162  *  and locked by br->multicast_lock and RCU
1163  */
1164 static void br_multicast_add_router(struct net_bridge *br,
1165                                     struct net_bridge_port *port)
1166 {
1167         struct net_bridge_port *p;
1168         struct hlist_node *slot = NULL;
1169
1170         hlist_for_each_entry(p, &br->router_list, rlist) {
1171                 if ((unsigned long) port >= (unsigned long) p)
1172                         break;
1173                 slot = &p->rlist;
1174         }
1175
1176         if (slot)
1177                 hlist_add_after_rcu(slot, &port->rlist);
1178         else
1179                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1180 }
1181
1182 static void br_multicast_mark_router(struct net_bridge *br,
1183                                      struct net_bridge_port *port)
1184 {
1185         unsigned long now = jiffies;
1186
1187         if (!port) {
1188                 if (br->multicast_router == 1)
1189                         mod_timer(&br->multicast_router_timer,
1190                                   now + br->multicast_querier_interval);
1191                 return;
1192         }
1193
1194         if (port->multicast_router != 1)
1195                 return;
1196
1197         if (!hlist_unhashed(&port->rlist))
1198                 goto timer;
1199
1200         br_multicast_add_router(br, port);
1201
1202 timer:
1203         mod_timer(&port->multicast_router_timer,
1204                   now + br->multicast_querier_interval);
1205 }
1206
1207 static void br_multicast_query_received(struct net_bridge *br,
1208                                         struct net_bridge_port *port,
1209                                         struct bridge_mcast_other_query *query,
1210                                         struct br_ip *saddr,
1211                                         unsigned long max_delay)
1212 {
1213         if (!br_multicast_select_querier(br, port, saddr))
1214                 return;
1215
1216         br_multicast_update_query_timer(br, query, max_delay);
1217         br_multicast_mark_router(br, port);
1218 }
1219
1220 static int br_ip4_multicast_query(struct net_bridge *br,
1221                                   struct net_bridge_port *port,
1222                                   struct sk_buff *skb,
1223                                   u16 vid)
1224 {
1225         const struct iphdr *iph = ip_hdr(skb);
1226         struct igmphdr *ih = igmp_hdr(skb);
1227         struct net_bridge_mdb_entry *mp;
1228         struct igmpv3_query *ih3;
1229         struct net_bridge_port_group *p;
1230         struct net_bridge_port_group __rcu **pp;
1231         struct br_ip saddr;
1232         unsigned long max_delay;
1233         unsigned long now = jiffies;
1234         __be32 group;
1235         int err = 0;
1236
1237         spin_lock(&br->multicast_lock);
1238         if (!netif_running(br->dev) ||
1239             (port && port->state == BR_STATE_DISABLED))
1240                 goto out;
1241
1242         group = ih->group;
1243
1244         if (skb->len == sizeof(*ih)) {
1245                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1246
1247                 if (!max_delay) {
1248                         max_delay = 10 * HZ;
1249                         group = 0;
1250                 }
1251         } else {
1252                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1253                         err = -EINVAL;
1254                         goto out;
1255                 }
1256
1257                 ih3 = igmpv3_query_hdr(skb);
1258                 if (ih3->nsrcs)
1259                         goto out;
1260
1261                 max_delay = ih3->code ?
1262                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1263         }
1264
1265         /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1266          * all-systems destination addresses (224.0.0.1) for general queries
1267          */
1268         if (!group && iph->daddr != htonl(INADDR_ALLHOSTS_GROUP)) {
1269                 err = -EINVAL;
1270                 goto out;
1271         }
1272
1273         if (!group) {
1274                 saddr.proto = htons(ETH_P_IP);
1275                 saddr.u.ip4 = iph->saddr;
1276
1277                 br_multicast_query_received(br, port, &br->ip4_other_query,
1278                                             &saddr, max_delay);
1279                 goto out;
1280         }
1281
1282         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1283         if (!mp)
1284                 goto out;
1285
1286         max_delay *= br->multicast_last_member_count;
1287
1288         if (mp->mglist &&
1289             (timer_pending(&mp->timer) ?
1290              time_after(mp->timer.expires, now + max_delay) :
1291              try_to_del_timer_sync(&mp->timer) >= 0))
1292                 mod_timer(&mp->timer, now + max_delay);
1293
1294         for (pp = &mp->ports;
1295              (p = mlock_dereference(*pp, br)) != NULL;
1296              pp = &p->next) {
1297                 if (timer_pending(&p->timer) ?
1298                     time_after(p->timer.expires, now + max_delay) :
1299                     try_to_del_timer_sync(&p->timer) >= 0)
1300                         mod_timer(&p->timer, now + max_delay);
1301         }
1302
1303 out:
1304         spin_unlock(&br->multicast_lock);
1305         return err;
1306 }
1307
1308 #if IS_ENABLED(CONFIG_IPV6)
1309 static int br_ip6_multicast_query(struct net_bridge *br,
1310                                   struct net_bridge_port *port,
1311                                   struct sk_buff *skb,
1312                                   u16 vid)
1313 {
1314         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1315         struct mld_msg *mld;
1316         struct net_bridge_mdb_entry *mp;
1317         struct mld2_query *mld2q;
1318         struct net_bridge_port_group *p;
1319         struct net_bridge_port_group __rcu **pp;
1320         struct br_ip saddr;
1321         unsigned long max_delay;
1322         unsigned long now = jiffies;
1323         const struct in6_addr *group = NULL;
1324         bool is_general_query;
1325         int err = 0;
1326
1327         spin_lock(&br->multicast_lock);
1328         if (!netif_running(br->dev) ||
1329             (port && port->state == BR_STATE_DISABLED))
1330                 goto out;
1331
1332         /* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */
1333         if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
1334                 err = -EINVAL;
1335                 goto out;
1336         }
1337
1338         if (skb->len == sizeof(*mld)) {
1339                 if (!pskb_may_pull(skb, sizeof(*mld))) {
1340                         err = -EINVAL;
1341                         goto out;
1342                 }
1343                 mld = (struct mld_msg *) icmp6_hdr(skb);
1344                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1345                 if (max_delay)
1346                         group = &mld->mld_mca;
1347         } else {
1348                 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1349                         err = -EINVAL;
1350                         goto out;
1351                 }
1352                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1353                 if (!mld2q->mld2q_nsrcs)
1354                         group = &mld2q->mld2q_mca;
1355
1356                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1357         }
1358
1359         is_general_query = group && ipv6_addr_any(group);
1360
1361         /* RFC2710+RFC3810 (MLDv1+MLDv2) require the multicast link layer
1362          * all-nodes destination address (ff02::1) for general queries
1363          */
1364         if (is_general_query && !ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) {
1365                 err = -EINVAL;
1366                 goto out;
1367         }
1368
1369         if (is_general_query) {
1370                 saddr.proto = htons(ETH_P_IPV6);
1371                 saddr.u.ip6 = ip6h->saddr;
1372
1373                 br_multicast_query_received(br, port, &br->ip6_other_query,
1374                                             &saddr, max_delay);
1375                 goto out;
1376         } else if (!group) {
1377                 goto out;
1378         }
1379
1380         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1381         if (!mp)
1382                 goto out;
1383
1384         max_delay *= br->multicast_last_member_count;
1385         if (mp->mglist &&
1386             (timer_pending(&mp->timer) ?
1387              time_after(mp->timer.expires, now + max_delay) :
1388              try_to_del_timer_sync(&mp->timer) >= 0))
1389                 mod_timer(&mp->timer, now + max_delay);
1390
1391         for (pp = &mp->ports;
1392              (p = mlock_dereference(*pp, br)) != NULL;
1393              pp = &p->next) {
1394                 if (timer_pending(&p->timer) ?
1395                     time_after(p->timer.expires, now + max_delay) :
1396                     try_to_del_timer_sync(&p->timer) >= 0)
1397                         mod_timer(&p->timer, now + max_delay);
1398         }
1399
1400 out:
1401         spin_unlock(&br->multicast_lock);
1402         return err;
1403 }
1404 #endif
1405
1406 static void
1407 br_multicast_leave_group(struct net_bridge *br,
1408                          struct net_bridge_port *port,
1409                          struct br_ip *group,
1410                          struct bridge_mcast_other_query *other_query,
1411                          struct bridge_mcast_own_query *own_query)
1412 {
1413         struct net_bridge_mdb_htable *mdb;
1414         struct net_bridge_mdb_entry *mp;
1415         struct net_bridge_port_group *p;
1416         unsigned long now;
1417         unsigned long time;
1418
1419         spin_lock(&br->multicast_lock);
1420         if (!netif_running(br->dev) ||
1421             (port && port->state == BR_STATE_DISABLED) ||
1422             timer_pending(&other_query->timer))
1423                 goto out;
1424
1425         mdb = mlock_dereference(br->mdb, br);
1426         mp = br_mdb_ip_get(mdb, group);
1427         if (!mp)
1428                 goto out;
1429
1430         if (br->multicast_querier) {
1431                 __br_multicast_send_query(br, port, &mp->addr);
1432
1433                 time = jiffies + br->multicast_last_member_count *
1434                                  br->multicast_last_member_interval;
1435
1436                 mod_timer(&own_query->timer, time);
1437
1438                 for (p = mlock_dereference(mp->ports, br);
1439                      p != NULL;
1440                      p = mlock_dereference(p->next, br)) {
1441                         if (p->port != port)
1442                                 continue;
1443
1444                         if (!hlist_unhashed(&p->mglist) &&
1445                             (timer_pending(&p->timer) ?
1446                              time_after(p->timer.expires, time) :
1447                              try_to_del_timer_sync(&p->timer) >= 0)) {
1448                                 mod_timer(&p->timer, time);
1449                         }
1450
1451                         break;
1452                 }
1453         }
1454
1455         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1456                 struct net_bridge_port_group __rcu **pp;
1457
1458                 for (pp = &mp->ports;
1459                      (p = mlock_dereference(*pp, br)) != NULL;
1460                      pp = &p->next) {
1461                         if (p->port != port)
1462                                 continue;
1463
1464                         rcu_assign_pointer(*pp, p->next);
1465                         hlist_del_init(&p->mglist);
1466                         del_timer(&p->timer);
1467                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1468                         br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1469
1470                         if (!mp->ports && !mp->mglist &&
1471                             netif_running(br->dev))
1472                                 mod_timer(&mp->timer, jiffies);
1473                 }
1474                 goto out;
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 *skb2 = skb;
1561         const struct iphdr *iph;
1562         struct igmphdr *ih;
1563         unsigned int len;
1564         unsigned int offset;
1565         int err;
1566
1567         /* We treat OOM as packet loss for now. */
1568         if (!pskb_may_pull(skb, sizeof(*iph)))
1569                 return -EINVAL;
1570
1571         iph = ip_hdr(skb);
1572
1573         if (iph->ihl < 5 || iph->version != 4)
1574                 return -EINVAL;
1575
1576         if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1577                 return -EINVAL;
1578
1579         iph = ip_hdr(skb);
1580
1581         if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1582                 return -EINVAL;
1583
1584         if (iph->protocol != IPPROTO_IGMP) {
1585                 if (!ipv4_is_local_multicast(iph->daddr))
1586                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1587                 return 0;
1588         }
1589
1590         len = ntohs(iph->tot_len);
1591         if (skb->len < len || len < ip_hdrlen(skb))
1592                 return -EINVAL;
1593
1594         if (skb->len > len) {
1595                 skb2 = skb_clone(skb, GFP_ATOMIC);
1596                 if (!skb2)
1597                         return -ENOMEM;
1598
1599                 err = pskb_trim_rcsum(skb2, len);
1600                 if (err)
1601                         goto err_out;
1602         }
1603
1604         len -= ip_hdrlen(skb2);
1605         offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1606         __skb_pull(skb2, offset);
1607         skb_reset_transport_header(skb2);
1608
1609         err = -EINVAL;
1610         if (!pskb_may_pull(skb2, sizeof(*ih)))
1611                 goto out;
1612
1613         switch (skb2->ip_summed) {
1614         case CHECKSUM_COMPLETE:
1615                 if (!csum_fold(skb2->csum))
1616                         break;
1617                 /* fall through */
1618         case CHECKSUM_NONE:
1619                 skb2->csum = 0;
1620                 if (skb_checksum_complete(skb2))
1621                         goto out;
1622         }
1623
1624         err = 0;
1625
1626         BR_INPUT_SKB_CB(skb)->igmp = 1;
1627         ih = igmp_hdr(skb2);
1628
1629         switch (ih->type) {
1630         case IGMP_HOST_MEMBERSHIP_REPORT:
1631         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1632                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1633                 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1634                 break;
1635         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1636                 err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
1637                 break;
1638         case IGMP_HOST_MEMBERSHIP_QUERY:
1639                 err = br_ip4_multicast_query(br, port, skb2, vid);
1640                 break;
1641         case IGMP_HOST_LEAVE_MESSAGE:
1642                 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1643                 break;
1644         }
1645
1646 out:
1647         __skb_push(skb2, offset);
1648 err_out:
1649         if (skb2 != skb)
1650                 kfree_skb(skb2);
1651         return err;
1652 }
1653
1654 #if IS_ENABLED(CONFIG_IPV6)
1655 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1656                                  struct net_bridge_port *port,
1657                                  struct sk_buff *skb,
1658                                  u16 vid)
1659 {
1660         struct sk_buff *skb2;
1661         const struct ipv6hdr *ip6h;
1662         u8 icmp6_type;
1663         u8 nexthdr;
1664         __be16 frag_off;
1665         unsigned int len;
1666         int offset;
1667         int err;
1668
1669         if (!pskb_may_pull(skb, sizeof(*ip6h)))
1670                 return -EINVAL;
1671
1672         ip6h = ipv6_hdr(skb);
1673
1674         /*
1675          * We're interested in MLD messages only.
1676          *  - Version is 6
1677          *  - MLD has always Router Alert hop-by-hop option
1678          *  - But we do not support jumbrograms.
1679          */
1680         if (ip6h->version != 6)
1681                 return 0;
1682
1683         /* Prevent flooding this packet if there is no listener present */
1684         if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr))
1685                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1686
1687         if (ip6h->nexthdr != IPPROTO_HOPOPTS ||
1688             ip6h->payload_len == 0)
1689                 return 0;
1690
1691         len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1692         if (skb->len < len)
1693                 return -EINVAL;
1694
1695         nexthdr = ip6h->nexthdr;
1696         offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1697
1698         if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1699                 return 0;
1700
1701         /* Okay, we found ICMPv6 header */
1702         skb2 = skb_clone(skb, GFP_ATOMIC);
1703         if (!skb2)
1704                 return -ENOMEM;
1705
1706         err = -EINVAL;
1707         if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1708                 goto out;
1709
1710         len -= offset - skb_network_offset(skb2);
1711
1712         __skb_pull(skb2, offset);
1713         skb_reset_transport_header(skb2);
1714         skb_postpull_rcsum(skb2, skb_network_header(skb2),
1715                            skb_network_header_len(skb2));
1716
1717         icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1718
1719         switch (icmp6_type) {
1720         case ICMPV6_MGM_QUERY:
1721         case ICMPV6_MGM_REPORT:
1722         case ICMPV6_MGM_REDUCTION:
1723         case ICMPV6_MLD2_REPORT:
1724                 break;
1725         default:
1726                 err = 0;
1727                 goto out;
1728         }
1729
1730         /* Okay, we found MLD message. Check further. */
1731         if (skb2->len > len) {
1732                 err = pskb_trim_rcsum(skb2, len);
1733                 if (err)
1734                         goto out;
1735                 err = -EINVAL;
1736         }
1737
1738         ip6h = ipv6_hdr(skb2);
1739
1740         switch (skb2->ip_summed) {
1741         case CHECKSUM_COMPLETE:
1742                 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1743                                         IPPROTO_ICMPV6, skb2->csum))
1744                         break;
1745                 /*FALLTHROUGH*/
1746         case CHECKSUM_NONE:
1747                 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1748                                                         &ip6h->daddr,
1749                                                         skb2->len,
1750                                                         IPPROTO_ICMPV6, 0));
1751                 if (__skb_checksum_complete(skb2))
1752                         goto out;
1753         }
1754
1755         err = 0;
1756
1757         BR_INPUT_SKB_CB(skb)->igmp = 1;
1758
1759         switch (icmp6_type) {
1760         case ICMPV6_MGM_REPORT:
1761             {
1762                 struct mld_msg *mld;
1763                 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1764                         err = -EINVAL;
1765                         goto out;
1766                 }
1767                 mld = (struct mld_msg *)skb_transport_header(skb2);
1768                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1769                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1770                 break;
1771             }
1772         case ICMPV6_MLD2_REPORT:
1773                 err = br_ip6_multicast_mld2_report(br, port, skb2, vid);
1774                 break;
1775         case ICMPV6_MGM_QUERY:
1776                 err = br_ip6_multicast_query(br, port, skb2, vid);
1777                 break;
1778         case ICMPV6_MGM_REDUCTION:
1779             {
1780                 struct mld_msg *mld;
1781                 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1782                         err = -EINVAL;
1783                         goto out;
1784                 }
1785                 mld = (struct mld_msg *)skb_transport_header(skb2);
1786                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1787             }
1788         }
1789
1790 out:
1791         kfree_skb(skb2);
1792         return err;
1793 }
1794 #endif
1795
1796 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1797                      struct sk_buff *skb, u16 vid)
1798 {
1799         BR_INPUT_SKB_CB(skb)->igmp = 0;
1800         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1801
1802         if (br->multicast_disabled)
1803                 return 0;
1804
1805         switch (skb->protocol) {
1806         case htons(ETH_P_IP):
1807                 return br_multicast_ipv4_rcv(br, port, skb, vid);
1808 #if IS_ENABLED(CONFIG_IPV6)
1809         case htons(ETH_P_IPV6):
1810                 return br_multicast_ipv6_rcv(br, port, skb, vid);
1811 #endif
1812         }
1813
1814         return 0;
1815 }
1816
1817 static void br_multicast_query_expired(struct net_bridge *br,
1818                                        struct bridge_mcast_own_query *query,
1819                                        struct bridge_mcast_querier *querier)
1820 {
1821         spin_lock(&br->multicast_lock);
1822         if (query->startup_sent < br->multicast_startup_query_count)
1823                 query->startup_sent++;
1824
1825         rcu_assign_pointer(querier, NULL);
1826         br_multicast_send_query(br, NULL, query);
1827         spin_unlock(&br->multicast_lock);
1828 }
1829
1830 static void br_ip4_multicast_query_expired(unsigned long data)
1831 {
1832         struct net_bridge *br = (void *)data;
1833
1834         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1835 }
1836
1837 #if IS_ENABLED(CONFIG_IPV6)
1838 static void br_ip6_multicast_query_expired(unsigned long data)
1839 {
1840         struct net_bridge *br = (void *)data;
1841
1842         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1843 }
1844 #endif
1845
1846 void br_multicast_init(struct net_bridge *br)
1847 {
1848         br->hash_elasticity = 4;
1849         br->hash_max = 512;
1850
1851         br->multicast_router = 1;
1852         br->multicast_querier = 0;
1853         br->multicast_query_use_ifaddr = 0;
1854         br->multicast_last_member_count = 2;
1855         br->multicast_startup_query_count = 2;
1856
1857         br->multicast_last_member_interval = HZ;
1858         br->multicast_query_response_interval = 10 * HZ;
1859         br->multicast_startup_query_interval = 125 * HZ / 4;
1860         br->multicast_query_interval = 125 * HZ;
1861         br->multicast_querier_interval = 255 * HZ;
1862         br->multicast_membership_interval = 260 * HZ;
1863
1864         br->ip4_other_query.delay_time = 0;
1865         br->ip4_querier.port = NULL;
1866 #if IS_ENABLED(CONFIG_IPV6)
1867         br->ip6_other_query.delay_time = 0;
1868         br->ip6_querier.port = NULL;
1869 #endif
1870
1871         spin_lock_init(&br->multicast_lock);
1872         setup_timer(&br->multicast_router_timer,
1873                     br_multicast_local_router_expired, 0);
1874         setup_timer(&br->ip4_other_query.timer,
1875                     br_ip4_multicast_querier_expired, (unsigned long)br);
1876         setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1877                     (unsigned long)br);
1878 #if IS_ENABLED(CONFIG_IPV6)
1879         setup_timer(&br->ip6_other_query.timer,
1880                     br_ip6_multicast_querier_expired, (unsigned long)br);
1881         setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1882                     (unsigned long)br);
1883 #endif
1884 }
1885
1886 static void __br_multicast_open(struct net_bridge *br,
1887                                 struct bridge_mcast_own_query *query)
1888 {
1889         query->startup_sent = 0;
1890
1891         if (br->multicast_disabled)
1892                 return;
1893
1894         mod_timer(&query->timer, jiffies);
1895 }
1896
1897 void br_multicast_open(struct net_bridge *br)
1898 {
1899         __br_multicast_open(br, &br->ip4_own_query);
1900 #if IS_ENABLED(CONFIG_IPV6)
1901         __br_multicast_open(br, &br->ip6_own_query);
1902 #endif
1903 }
1904
1905 void br_multicast_stop(struct net_bridge *br)
1906 {
1907         struct net_bridge_mdb_htable *mdb;
1908         struct net_bridge_mdb_entry *mp;
1909         struct hlist_node *n;
1910         u32 ver;
1911         int i;
1912
1913         del_timer_sync(&br->multicast_router_timer);
1914         del_timer_sync(&br->ip4_other_query.timer);
1915         del_timer_sync(&br->ip4_own_query.timer);
1916 #if IS_ENABLED(CONFIG_IPV6)
1917         del_timer_sync(&br->ip6_other_query.timer);
1918         del_timer_sync(&br->ip6_own_query.timer);
1919 #endif
1920
1921         spin_lock_bh(&br->multicast_lock);
1922         mdb = mlock_dereference(br->mdb, br);
1923         if (!mdb)
1924                 goto out;
1925
1926         br->mdb = NULL;
1927
1928         ver = mdb->ver;
1929         for (i = 0; i < mdb->max; i++) {
1930                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1931                                           hlist[ver]) {
1932                         del_timer(&mp->timer);
1933                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
1934                 }
1935         }
1936
1937         if (mdb->old) {
1938                 spin_unlock_bh(&br->multicast_lock);
1939                 rcu_barrier_bh();
1940                 spin_lock_bh(&br->multicast_lock);
1941                 WARN_ON(mdb->old);
1942         }
1943
1944         mdb->old = mdb;
1945         call_rcu_bh(&mdb->rcu, br_mdb_free);
1946
1947 out:
1948         spin_unlock_bh(&br->multicast_lock);
1949 }
1950
1951 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1952 {
1953         int err = -ENOENT;
1954
1955         spin_lock_bh(&br->multicast_lock);
1956         if (!netif_running(br->dev))
1957                 goto unlock;
1958
1959         switch (val) {
1960         case 0:
1961         case 2:
1962                 del_timer(&br->multicast_router_timer);
1963                 /* fall through */
1964         case 1:
1965                 br->multicast_router = val;
1966                 err = 0;
1967                 break;
1968
1969         default:
1970                 err = -EINVAL;
1971                 break;
1972         }
1973
1974 unlock:
1975         spin_unlock_bh(&br->multicast_lock);
1976
1977         return err;
1978 }
1979
1980 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1981 {
1982         struct net_bridge *br = p->br;
1983         int err = -ENOENT;
1984
1985         spin_lock(&br->multicast_lock);
1986         if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1987                 goto unlock;
1988
1989         switch (val) {
1990         case 0:
1991         case 1:
1992         case 2:
1993                 p->multicast_router = val;
1994                 err = 0;
1995
1996                 if (val < 2 && !hlist_unhashed(&p->rlist))
1997                         hlist_del_init_rcu(&p->rlist);
1998
1999                 if (val == 1)
2000                         break;
2001
2002                 del_timer(&p->multicast_router_timer);
2003
2004                 if (val == 0)
2005                         break;
2006
2007                 br_multicast_add_router(br, p);
2008                 break;
2009
2010         default:
2011                 err = -EINVAL;
2012                 break;
2013         }
2014
2015 unlock:
2016         spin_unlock(&br->multicast_lock);
2017
2018         return err;
2019 }
2020
2021 static void br_multicast_start_querier(struct net_bridge *br,
2022                                        struct bridge_mcast_own_query *query)
2023 {
2024         struct net_bridge_port *port;
2025
2026         __br_multicast_open(br, query);
2027
2028         list_for_each_entry(port, &br->port_list, list) {
2029                 if (port->state == BR_STATE_DISABLED ||
2030                     port->state == BR_STATE_BLOCKING)
2031                         continue;
2032
2033                 if (query == &br->ip4_own_query)
2034                         br_multicast_enable(&port->ip4_own_query);
2035 #if IS_ENABLED(CONFIG_IPV6)
2036                 else
2037                         br_multicast_enable(&port->ip6_own_query);
2038 #endif
2039         }
2040 }
2041
2042 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2043 {
2044         int err = 0;
2045         struct net_bridge_mdb_htable *mdb;
2046
2047         spin_lock_bh(&br->multicast_lock);
2048         if (br->multicast_disabled == !val)
2049                 goto unlock;
2050
2051         br->multicast_disabled = !val;
2052         if (br->multicast_disabled)
2053                 goto unlock;
2054
2055         if (!netif_running(br->dev))
2056                 goto unlock;
2057
2058         mdb = mlock_dereference(br->mdb, br);
2059         if (mdb) {
2060                 if (mdb->old) {
2061                         err = -EEXIST;
2062 rollback:
2063                         br->multicast_disabled = !!val;
2064                         goto unlock;
2065                 }
2066
2067                 err = br_mdb_rehash(&br->mdb, mdb->max,
2068                                     br->hash_elasticity);
2069                 if (err)
2070                         goto rollback;
2071         }
2072
2073         br_multicast_start_querier(br, &br->ip4_own_query);
2074 #if IS_ENABLED(CONFIG_IPV6)
2075         br_multicast_start_querier(br, &br->ip6_own_query);
2076 #endif
2077
2078 unlock:
2079         spin_unlock_bh(&br->multicast_lock);
2080
2081         return err;
2082 }
2083
2084 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2085 {
2086         unsigned long max_delay;
2087
2088         val = !!val;
2089
2090         spin_lock_bh(&br->multicast_lock);
2091         if (br->multicast_querier == val)
2092                 goto unlock;
2093
2094         br->multicast_querier = val;
2095         if (!val)
2096                 goto unlock;
2097
2098         max_delay = br->multicast_query_response_interval;
2099
2100         if (!timer_pending(&br->ip4_other_query.timer))
2101                 br->ip4_other_query.delay_time = jiffies + max_delay;
2102
2103         br_multicast_start_querier(br, &br->ip4_own_query);
2104
2105 #if IS_ENABLED(CONFIG_IPV6)
2106         if (!timer_pending(&br->ip6_other_query.timer))
2107                 br->ip6_other_query.delay_time = jiffies + max_delay;
2108
2109         br_multicast_start_querier(br, &br->ip6_own_query);
2110 #endif
2111
2112 unlock:
2113         spin_unlock_bh(&br->multicast_lock);
2114
2115         return 0;
2116 }
2117
2118 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2119 {
2120         int err = -ENOENT;
2121         u32 old;
2122         struct net_bridge_mdb_htable *mdb;
2123
2124         spin_lock_bh(&br->multicast_lock);
2125         if (!netif_running(br->dev))
2126                 goto unlock;
2127
2128         err = -EINVAL;
2129         if (!is_power_of_2(val))
2130                 goto unlock;
2131
2132         mdb = mlock_dereference(br->mdb, br);
2133         if (mdb && val < mdb->size)
2134                 goto unlock;
2135
2136         err = 0;
2137
2138         old = br->hash_max;
2139         br->hash_max = val;
2140
2141         if (mdb) {
2142                 if (mdb->old) {
2143                         err = -EEXIST;
2144 rollback:
2145                         br->hash_max = old;
2146                         goto unlock;
2147                 }
2148
2149                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2150                                     br->hash_elasticity);
2151                 if (err)
2152                         goto rollback;
2153         }
2154
2155 unlock:
2156         spin_unlock_bh(&br->multicast_lock);
2157
2158         return err;
2159 }
2160
2161 /**
2162  * br_multicast_list_adjacent - Returns snooped multicast addresses
2163  * @dev:        The bridge port adjacent to which to retrieve addresses
2164  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2165  *
2166  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2167  * snooping feature on all bridge ports of dev's bridge device, excluding
2168  * the addresses from dev itself.
2169  *
2170  * Returns the number of items added to br_ip_list.
2171  *
2172  * Notes:
2173  * - br_ip_list needs to be initialized by caller
2174  * - br_ip_list might contain duplicates in the end
2175  *   (needs to be taken care of by caller)
2176  * - br_ip_list needs to be freed by caller
2177  */
2178 int br_multicast_list_adjacent(struct net_device *dev,
2179                                struct list_head *br_ip_list)
2180 {
2181         struct net_bridge *br;
2182         struct net_bridge_port *port;
2183         struct net_bridge_port_group *group;
2184         struct br_ip_list *entry;
2185         int count = 0;
2186
2187         rcu_read_lock();
2188         if (!br_ip_list || !br_port_exists(dev))
2189                 goto unlock;
2190
2191         port = br_port_get_rcu(dev);
2192         if (!port || !port->br)
2193                 goto unlock;
2194
2195         br = port->br;
2196
2197         list_for_each_entry_rcu(port, &br->port_list, list) {
2198                 if (!port->dev || port->dev == dev)
2199                         continue;
2200
2201                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2202                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2203                         if (!entry)
2204                                 goto unlock;
2205
2206                         entry->addr = group->addr;
2207                         list_add(&entry->list, br_ip_list);
2208                         count++;
2209                 }
2210         }
2211
2212 unlock:
2213         rcu_read_unlock();
2214         return count;
2215 }
2216 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2217
2218 /**
2219  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2220  * @dev: The bridge port adjacent to which to check for a querier
2221  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2222  *
2223  * Checks whether the given interface has a bridge on top and if so returns
2224  * true if a selected querier is behind one of the other ports of this
2225  * bridge. Otherwise returns false.
2226  */
2227 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2228 {
2229         struct net_bridge *br;
2230         struct net_bridge_port *port;
2231         bool ret = false;
2232
2233         rcu_read_lock();
2234         if (!br_port_exists(dev))
2235                 goto unlock;
2236
2237         port = br_port_get_rcu(dev);
2238         if (!port || !port->br)
2239                 goto unlock;
2240
2241         br = port->br;
2242
2243         switch (proto) {
2244         case ETH_P_IP:
2245                 if (!timer_pending(&br->ip4_other_query.timer) ||
2246                     rcu_dereference(br->ip4_querier.port) == port)
2247                         goto unlock;
2248                 break;
2249         case ETH_P_IPV6:
2250                 if (!timer_pending(&br->ip6_other_query.timer) ||
2251                     rcu_dereference(br->ip6_querier.port) == port)
2252                         goto unlock;
2253                 break;
2254         default:
2255                 goto unlock;
2256         }
2257
2258         ret = true;
2259 unlock:
2260         rcu_read_unlock();
2261         return ret;
2262 }
2263 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);