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->dev = port->dev;
 817                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
 818                         br_dev_queue_push_xmit);
 819         } else {
 820                 br_multicast_select_own_querier(br, ip, skb);
 821                 netif_rx(skb);
 822         }
 823 }
 824
 825 static void br_multicast_send_query(struct net_bridge *br,
 826                                     struct net_bridge_port *port,
 827                                     struct bridge_mcast_own_query *own_query)
 828 {
 829         unsigned long time;
 830         struct br_ip br_group;
 831         struct bridge_mcast_other_query *other_query = NULL;
 832
 833         if (!netif_running(br->dev) || br->multicast_disabled ||
 834             !br->multicast_querier)
 835                 return;
 836
 837         memset(&br_group.u, 0, sizeof(br_group.u));
 838
 839         if (port ? (own_query == &port->ip4_own_query) :
 840                    (own_query == &br->ip4_own_query)) {
 841                 other_query = &br->ip4_other_query;
 842                 br_group.proto = htons(ETH_P_IP);
 843 #if IS_ENABLED(CONFIG_IPV6)
 844         } else {
 845                 other_query = &br->ip6_other_query;
 846                 br_group.proto = htons(ETH_P_IPV6);
 847 #endif
 848         }
 849
 850         if (!other_query || timer_pending(&other_query->timer))
 851                 return;
 852
 853         __br_multicast_send_query(br, port, &br_group);
 854
 855         time = jiffies;
 856         time += own_query->startup_sent < br->multicast_startup_query_count ?
 857                 br->multicast_startup_query_interval :
 858                 br->multicast_query_interval;
 859         mod_timer(&own_query->timer, time);
 860 }
 861
 862 static void
 863 br_multicast_port_query_expired(struct net_bridge_port *port,
 864                                 struct bridge_mcast_own_query *query)
 865 {
 866         struct net_bridge *br = port->br;
 867
 868         spin_lock(&br->multicast_lock);
 869         if (port->state == BR_STATE_DISABLED ||
 870             port->state == BR_STATE_BLOCKING)
 871                 goto out;
 872
 873         if (query->startup_sent < br->multicast_startup_query_count)
 874                 query->startup_sent++;
 875
 876         br_multicast_send_query(port->br, port, query);
 877
 878 out:
 879         spin_unlock(&br->multicast_lock);
 880 }
 881
 882 static void br_ip4_multicast_port_query_expired(unsigned long data)
 883 {
 884         struct net_bridge_port *port = (void *)data;
 885
 886         br_multicast_port_query_expired(port, &port->ip4_own_query);
 887 }
 888
 889 #if IS_ENABLED(CONFIG_IPV6)
 890 static void br_ip6_multicast_port_query_expired(unsigned long data)
 891 {
 892         struct net_bridge_port *port = (void *)data;
 893
 894         br_multicast_port_query_expired(port, &port->ip6_own_query);
 895 }
 896 #endif
 897
 898 void br_multicast_add_port(struct net_bridge_port *port)
 899 {
 900         port->multicast_router = 1;
 901
 902         setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
 903                     (unsigned long)port);
 904         setup_timer(&port->ip4_own_query.timer,
 905                     br_ip4_multicast_port_query_expired, (unsigned long)port);
 906 #if IS_ENABLED(CONFIG_IPV6)
 907         setup_timer(&port->ip6_own_query.timer,
 908                     br_ip6_multicast_port_query_expired, (unsigned long)port);
 909 #endif
 910 }
 911
 912 void br_multicast_del_port(struct net_bridge_port *port)
 913 {
 914         del_timer_sync(&port->multicast_router_timer);
 915 }
 916
 917 static void br_multicast_enable(struct bridge_mcast_own_query *query)
 918 {
 919         query->startup_sent = 0;
 920
 921         if (try_to_del_timer_sync(&query->timer) >= 0 ||
 922             del_timer(&query->timer))
 923                 mod_timer(&query->timer, jiffies);
 924 }
 925
 926 void br_multicast_enable_port(struct net_bridge_port *port)
 927 {
 928         struct net_bridge *br = port->br;
 929
 930         spin_lock(&br->multicast_lock);
 931         if (br->multicast_disabled || !netif_running(br->dev))
 932                 goto out;
 933
 934         br_multicast_enable(&port->ip4_own_query);
 935 #if IS_ENABLED(CONFIG_IPV6)
 936         br_multicast_enable(&port->ip6_own_query);
 937 #endif
 938
 939 out:
 940         spin_unlock(&br->multicast_lock);
 941 }
 942
 943 void br_multicast_disable_port(struct net_bridge_port *port)
 944 {
 945         struct net_bridge *br = port->br;
 946         struct net_bridge_port_group *pg;
 947         struct hlist_node *n;
 948
 949         spin_lock(&br->multicast_lock);
 950         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 951                 br_multicast_del_pg(br, pg);
 952
 953         if (!hlist_unhashed(&port->rlist))
 954                 hlist_del_init_rcu(&port->rlist);
 955         del_timer(&port->multicast_router_timer);
 956         del_timer(&port->ip4_own_query.timer);
 957 #if IS_ENABLED(CONFIG_IPV6)
 958         del_timer(&port->ip6_own_query.timer);
 959 #endif
 960         spin_unlock(&br->multicast_lock);
 961 }
 962
 963 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
 964                                          struct net_bridge_port *port,
 965                                          struct sk_buff *skb,
 966                                          u16 vid)
 967 {
 968         struct igmpv3_report *ih;
 969         struct igmpv3_grec *grec;
 970         int i;
 971         int len;
 972         int num;
 973         int type;
 974         int err = 0;
 975         __be32 group;
 976
 977         if (!pskb_may_pull(skb, sizeof(*ih)))
 978                 return -EINVAL;
 979
 980         ih = igmpv3_report_hdr(skb);
 981         num = ntohs(ih->ngrec);
 982         len = sizeof(*ih);
 983
 984         for (i = 0; i < num; i++) {
 985                 len += sizeof(*grec);
 986                 if (!pskb_may_pull(skb, len))
 987                         return -EINVAL;
 988
 989                 grec = (void *)(skb->data + len - sizeof(*grec));
 990                 group = grec->grec_mca;
 991                 type = grec->grec_type;
 992
 993                 len += ntohs(grec->grec_nsrcs) * 4;
 994                 if (!pskb_may_pull(skb, len))
 995                         return -EINVAL;
 996
 997                 /* We treat this as an IGMPv2 report for now. */
 998                 switch (type) {
 999                 case IGMPV3_MODE_IS_INCLUDE:
1000                 case IGMPV3_MODE_IS_EXCLUDE:
1001                 case IGMPV3_CHANGE_TO_INCLUDE:
1002                 case IGMPV3_CHANGE_TO_EXCLUDE:
1003                 case IGMPV3_ALLOW_NEW_SOURCES:
1004                 case IGMPV3_BLOCK_OLD_SOURCES:
1005                         break;
1006
1007                 default:
1008                         continue;
1009                 }
1010
1011                 err = br_ip4_multicast_add_group(br, port, group, vid);
1012                 if (err)
1013                         break;
1014         }
1015
1016         return err;
1017 }
1018
1019 #if IS_ENABLED(CONFIG_IPV6)
1020 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1021                                         struct net_bridge_port *port,
1022                                         struct sk_buff *skb,
1023                                         u16 vid)
1024 {
1025         struct icmp6hdr *icmp6h;
1026         struct mld2_grec *grec;
1027         int i;
1028         int len;
1029         int num;
1030         int err = 0;
1031
1032         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1033                 return -EINVAL;
1034
1035         icmp6h = icmp6_hdr(skb);
1036         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1037         len = sizeof(*icmp6h);
1038
1039         for (i = 0; i < num; i++) {
1040                 __be16 *nsrcs, _nsrcs;
1041
1042                 nsrcs = skb_header_pointer(skb,
1043                                            len + offsetof(struct mld2_grec,
1044                                                           grec_nsrcs),
1045                                            sizeof(_nsrcs), &_nsrcs);
1046                 if (!nsrcs)
1047                         return -EINVAL;
1048
1049                 if (!pskb_may_pull(skb,
1050                                    len + sizeof(*grec) +
1051                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
1052                         return -EINVAL;
1053
1054                 grec = (struct mld2_grec *)(skb->data + len);
1055                 len += sizeof(*grec) +
1056                        sizeof(struct in6_addr) * ntohs(*nsrcs);
1057
1058                 /* We treat these as MLDv1 reports for now. */
1059                 switch (grec->grec_type) {
1060                 case MLD2_MODE_IS_INCLUDE:
1061                 case MLD2_MODE_IS_EXCLUDE:
1062                 case MLD2_CHANGE_TO_INCLUDE:
1063                 case MLD2_CHANGE_TO_EXCLUDE:
1064                 case MLD2_ALLOW_NEW_SOURCES:
1065                 case MLD2_BLOCK_OLD_SOURCES:
1066                         break;
1067
1068                 default:
1069                         continue;
1070                 }
1071
1072                 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1073                                                  vid);
1074                 if (err)
1075                         break;
1076         }
1077
1078         return err;
1079 }
1080 #endif
1081
1082 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1083                                             struct net_bridge_port *port,
1084                                             __be32 saddr)
1085 {
1086         if (!timer_pending(&br->ip4_own_query.timer) &&
1087             !timer_pending(&br->ip4_other_query.timer))
1088                 goto update;
1089
1090         if (!br->ip4_querier.addr.u.ip4)
1091                 goto update;
1092
1093         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1094                 goto update;
1095
1096         return false;
1097
1098 update:
1099         br->ip4_querier.addr.u.ip4 = saddr;
1100
1101         /* update protected by general multicast_lock by caller */
1102         rcu_assign_pointer(br->ip4_querier.port, port);
1103
1104         return true;
1105 }
1106
1107 #if IS_ENABLED(CONFIG_IPV6)
1108 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1109                                             struct net_bridge_port *port,
1110                                             struct in6_addr *saddr)
1111 {
1112         if (!timer_pending(&br->ip6_own_query.timer) &&
1113             !timer_pending(&br->ip6_other_query.timer))
1114                 goto update;
1115
1116         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1117                 goto update;
1118
1119         return false;
1120
1121 update:
1122         br->ip6_querier.addr.u.ip6 = *saddr;
1123
1124         /* update protected by general multicast_lock by caller */
1125         rcu_assign_pointer(br->ip6_querier.port, port);
1126
1127         return true;
1128 }
1129 #endif
1130
1131 static bool br_multicast_select_querier(struct net_bridge *br,
1132                                         struct net_bridge_port *port,
1133                                         struct br_ip *saddr)
1134 {
1135         switch (saddr->proto) {
1136         case htons(ETH_P_IP):
1137                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1138 #if IS_ENABLED(CONFIG_IPV6)
1139         case htons(ETH_P_IPV6):
1140                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1141 #endif
1142         }
1143
1144         return false;
1145 }
1146
1147 static void
1148 br_multicast_update_query_timer(struct net_bridge *br,
1149                                 struct bridge_mcast_other_query *query,
1150                                 unsigned long max_delay)
1151 {
1152         if (!timer_pending(&query->timer))
1153                 query->delay_time = jiffies + max_delay;
1154
1155         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1156 }
1157
1158 /*
1159  * Add port to router_list
1160  *  list is maintained ordered by pointer value
1161  *  and locked by br->multicast_lock and RCU
1162  */
1163 static void br_multicast_add_router(struct net_bridge *br,
1164                                     struct net_bridge_port *port)
1165 {
1166         struct net_bridge_port *p;
1167         struct hlist_node *slot = NULL;
1168
1169         if (!hlist_unhashed(&port->rlist))
1170                 return;
1171
1172         hlist_for_each_entry(p, &br->router_list, rlist) {
1173                 if ((unsigned long) port >= (unsigned long) p)
1174                         break;
1175                 slot = &p->rlist;
1176         }
1177
1178         if (slot)
1179                 hlist_add_behind_rcu(&port->rlist, slot);
1180         else
1181                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1182 }
1183
1184 static void br_multicast_mark_router(struct net_bridge *br,
1185                                      struct net_bridge_port *port)
1186 {
1187         unsigned long now = jiffies;
1188
1189         if (!port) {
1190                 if (br->multicast_router == 1)
1191                         mod_timer(&br->multicast_router_timer,
1192                                   now + br->multicast_querier_interval);
1193                 return;
1194         }
1195
1196         if (port->multicast_router != 1)
1197                 return;
1198
1199         br_multicast_add_router(br, port);
1200
1201         mod_timer(&port->multicast_router_timer,
1202                   now + br->multicast_querier_interval);
1203 }
1204
1205 static void br_multicast_query_received(struct net_bridge *br,
1206                                         struct net_bridge_port *port,
1207                                         struct bridge_mcast_other_query *query,
1208                                         struct br_ip *saddr,
1209                                         unsigned long max_delay)
1210 {
1211         if (!br_multicast_select_querier(br, port, saddr))
1212                 return;
1213
1214         br_multicast_update_query_timer(br, query, max_delay);
1215         br_multicast_mark_router(br, port);
1216 }
1217
1218 static int br_ip4_multicast_query(struct net_bridge *br,
1219                                   struct net_bridge_port *port,
1220                                   struct sk_buff *skb,
1221                                   u16 vid)
1222 {
1223         const struct iphdr *iph = ip_hdr(skb);
1224         struct igmphdr *ih = igmp_hdr(skb);
1225         struct net_bridge_mdb_entry *mp;
1226         struct igmpv3_query *ih3;
1227         struct net_bridge_port_group *p;
1228         struct net_bridge_port_group __rcu **pp;
1229         struct br_ip saddr;
1230         unsigned long max_delay;
1231         unsigned long now = jiffies;
1232         __be32 group;
1233         int err = 0;
1234
1235         spin_lock(&br->multicast_lock);
1236         if (!netif_running(br->dev) ||
1237             (port && port->state == BR_STATE_DISABLED))
1238                 goto out;
1239
1240         group = ih->group;
1241
1242         if (skb->len == sizeof(*ih)) {
1243                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1244
1245                 if (!max_delay) {
1246                         max_delay = 10 * HZ;
1247                         group = 0;
1248                 }
1249         } else {
1250                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1251                         err = -EINVAL;
1252                         goto out;
1253                 }
1254
1255                 ih3 = igmpv3_query_hdr(skb);
1256                 if (ih3->nsrcs)
1257                         goto out;
1258
1259                 max_delay = ih3->code ?
1260                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1261         }
1262
1263         /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1264          * all-systems destination addresses (224.0.0.1) for general queries
1265          */
1266         if (!group && iph->daddr != htonl(INADDR_ALLHOSTS_GROUP)) {
1267                 err = -EINVAL;
1268                 goto out;
1269         }
1270
1271         if (!group) {
1272                 saddr.proto = htons(ETH_P_IP);
1273                 saddr.u.ip4 = iph->saddr;
1274
1275                 br_multicast_query_received(br, port, &br->ip4_other_query,
1276                                             &saddr, max_delay);
1277                 goto out;
1278         }
1279
1280         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1281         if (!mp)
1282                 goto out;
1283
1284         max_delay *= br->multicast_last_member_count;
1285
1286         if (mp->mglist &&
1287             (timer_pending(&mp->timer) ?
1288              time_after(mp->timer.expires, now + max_delay) :
1289              try_to_del_timer_sync(&mp->timer) >= 0))
1290                 mod_timer(&mp->timer, now + max_delay);
1291
1292         for (pp = &mp->ports;
1293              (p = mlock_dereference(*pp, br)) != NULL;
1294              pp = &p->next) {
1295                 if (timer_pending(&p->timer) ?
1296                     time_after(p->timer.expires, now + max_delay) :
1297                     try_to_del_timer_sync(&p->timer) >= 0)
1298                         mod_timer(&p->timer, now + max_delay);
1299         }
1300
1301 out:
1302         spin_unlock(&br->multicast_lock);
1303         return err;
1304 }
1305
1306 #if IS_ENABLED(CONFIG_IPV6)
1307 static int br_ip6_multicast_query(struct net_bridge *br,
1308                                   struct net_bridge_port *port,
1309                                   struct sk_buff *skb,
1310                                   u16 vid)
1311 {
1312         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1313         struct mld_msg *mld;
1314         struct net_bridge_mdb_entry *mp;
1315         struct mld2_query *mld2q;
1316         struct net_bridge_port_group *p;
1317         struct net_bridge_port_group __rcu **pp;
1318         struct br_ip saddr;
1319         unsigned long max_delay;
1320         unsigned long now = jiffies;
1321         const struct in6_addr *group = NULL;
1322         bool is_general_query;
1323         int err = 0;
1324
1325         spin_lock(&br->multicast_lock);
1326         if (!netif_running(br->dev) ||
1327             (port && port->state == BR_STATE_DISABLED))
1328                 goto out;
1329
1330         /* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */
1331         if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
1332                 err = -EINVAL;
1333                 goto out;
1334         }
1335
1336         if (skb->len == sizeof(*mld)) {
1337                 if (!pskb_may_pull(skb, sizeof(*mld))) {
1338                         err = -EINVAL;
1339                         goto out;
1340                 }
1341                 mld = (struct mld_msg *) icmp6_hdr(skb);
1342                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1343                 if (max_delay)
1344                         group = &mld->mld_mca;
1345         } else {
1346                 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1347                         err = -EINVAL;
1348                         goto out;
1349                 }
1350                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1351                 if (!mld2q->mld2q_nsrcs)
1352                         group = &mld2q->mld2q_mca;
1353
1354                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1355         }
1356
1357         is_general_query = group && ipv6_addr_any(group);
1358
1359         /* RFC2710+RFC3810 (MLDv1+MLDv2) require the multicast link layer
1360          * all-nodes destination address (ff02::1) for general queries
1361          */
1362         if (is_general_query && !ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) {
1363                 err = -EINVAL;
1364                 goto out;
1365         }
1366
1367         if (is_general_query) {
1368                 saddr.proto = htons(ETH_P_IPV6);
1369                 saddr.u.ip6 = ip6h->saddr;
1370
1371                 br_multicast_query_received(br, port, &br->ip6_other_query,
1372                                             &saddr, max_delay);
1373                 goto out;
1374         } else if (!group) {
1375                 goto out;
1376         }
1377
1378         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1379         if (!mp)
1380                 goto out;
1381
1382         max_delay *= br->multicast_last_member_count;
1383         if (mp->mglist &&
1384             (timer_pending(&mp->timer) ?
1385              time_after(mp->timer.expires, now + max_delay) :
1386              try_to_del_timer_sync(&mp->timer) >= 0))
1387                 mod_timer(&mp->timer, now + max_delay);
1388
1389         for (pp = &mp->ports;
1390              (p = mlock_dereference(*pp, br)) != NULL;
1391              pp = &p->next) {
1392                 if (timer_pending(&p->timer) ?
1393                     time_after(p->timer.expires, now + max_delay) :
1394                     try_to_del_timer_sync(&p->timer) >= 0)
1395                         mod_timer(&p->timer, now + max_delay);
1396         }
1397
1398 out:
1399         spin_unlock(&br->multicast_lock);
1400         return err;
1401 }
1402 #endif
1403
1404 static void
1405 br_multicast_leave_group(struct net_bridge *br,
1406                          struct net_bridge_port *port,
1407                          struct br_ip *group,
1408                          struct bridge_mcast_other_query *other_query,
1409                          struct bridge_mcast_own_query *own_query)
1410 {
1411         struct net_bridge_mdb_htable *mdb;
1412         struct net_bridge_mdb_entry *mp;
1413         struct net_bridge_port_group *p;
1414         unsigned long now;
1415         unsigned long time;
1416
1417         spin_lock(&br->multicast_lock);
1418         if (!netif_running(br->dev) ||
1419             (port && port->state == BR_STATE_DISABLED) ||
1420             timer_pending(&other_query->timer))
1421                 goto out;
1422
1423         mdb = mlock_dereference(br->mdb, br);
1424         mp = br_mdb_ip_get(mdb, group);
1425         if (!mp)
1426                 goto out;
1427
1428         if (br->multicast_querier) {
1429                 __br_multicast_send_query(br, port, &mp->addr);
1430
1431                 time = jiffies + br->multicast_last_member_count *
1432                                  br->multicast_last_member_interval;
1433
1434                 mod_timer(&own_query->timer, time);
1435
1436                 for (p = mlock_dereference(mp->ports, br);
1437                      p != NULL;
1438                      p = mlock_dereference(p->next, br)) {
1439                         if (p->port != port)
1440                                 continue;
1441
1442                         if (!hlist_unhashed(&p->mglist) &&
1443                             (timer_pending(&p->timer) ?
1444                              time_after(p->timer.expires, time) :
1445                              try_to_del_timer_sync(&p->timer) >= 0)) {
1446                                 mod_timer(&p->timer, time);
1447                         }
1448
1449                         break;
1450                 }
1451         }
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
1468                         if (!mp->ports && !mp->mglist &&
1469                             netif_running(br->dev))
1470                                 mod_timer(&mp->timer, jiffies);
1471                 }
1472                 goto out;
1473         }
1474
1475         now = jiffies;
1476         time = now + br->multicast_last_member_count *
1477                      br->multicast_last_member_interval;
1478
1479         if (!port) {
1480                 if (mp->mglist &&
1481                     (timer_pending(&mp->timer) ?
1482                      time_after(mp->timer.expires, time) :
1483                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1484                         mod_timer(&mp->timer, time);
1485                 }
1486
1487                 goto out;
1488         }
1489
1490         for (p = mlock_dereference(mp->ports, br);
1491              p != NULL;
1492              p = mlock_dereference(p->next, br)) {
1493                 if (p->port != port)
1494                         continue;
1495
1496                 if (!hlist_unhashed(&p->mglist) &&
1497                     (timer_pending(&p->timer) ?
1498                      time_after(p->timer.expires, time) :
1499                      try_to_del_timer_sync(&p->timer) >= 0)) {
1500                         mod_timer(&p->timer, time);
1501                 }
1502
1503                 break;
1504         }
1505 out:
1506         spin_unlock(&br->multicast_lock);
1507 }
1508
1509 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1510                                          struct net_bridge_port *port,
1511                                          __be32 group,
1512                                          __u16 vid)
1513 {
1514         struct br_ip br_group;
1515         struct bridge_mcast_own_query *own_query;
1516
1517         if (ipv4_is_local_multicast(group))
1518                 return;
1519
1520         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1521
1522         br_group.u.ip4 = group;
1523         br_group.proto = htons(ETH_P_IP);
1524         br_group.vid = vid;
1525
1526         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1527                                  own_query);
1528 }
1529
1530 #if IS_ENABLED(CONFIG_IPV6)
1531 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1532                                          struct net_bridge_port *port,
1533                                          const struct in6_addr *group,
1534                                          __u16 vid)
1535 {
1536         struct br_ip br_group;
1537         struct bridge_mcast_own_query *own_query;
1538
1539         if (ipv6_addr_is_ll_all_nodes(group))
1540                 return;
1541
1542         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1543
1544         br_group.u.ip6 = *group;
1545         br_group.proto = htons(ETH_P_IPV6);
1546         br_group.vid = vid;
1547
1548         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1549                                  own_query);
1550 }
1551 #endif
1552
1553 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1554                                  struct net_bridge_port *port,
1555                                  struct sk_buff *skb,
1556                                  u16 vid)
1557 {
1558         struct sk_buff *skb2 = skb;
1559         const struct iphdr *iph;
1560         struct igmphdr *ih;
1561         unsigned int len;
1562         unsigned int offset;
1563         int err;
1564
1565         /* We treat OOM as packet loss for now. */
1566         if (!pskb_may_pull(skb, sizeof(*iph)))
1567                 return -EINVAL;
1568
1569         iph = ip_hdr(skb);
1570
1571         if (iph->ihl < 5 || iph->version != 4)
1572                 return -EINVAL;
1573
1574         if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1575                 return -EINVAL;
1576
1577         iph = ip_hdr(skb);
1578
1579         if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1580                 return -EINVAL;
1581
1582         if (iph->protocol != IPPROTO_IGMP) {
1583                 if (!ipv4_is_local_multicast(iph->daddr))
1584                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1585                 return 0;
1586         }
1587
1588         len = ntohs(iph->tot_len);
1589         if (skb->len < len || len < ip_hdrlen(skb))
1590                 return -EINVAL;
1591
1592         if (skb->len > len) {
1593                 skb2 = skb_clone(skb, GFP_ATOMIC);
1594                 if (!skb2)
1595                         return -ENOMEM;
1596
1597                 err = pskb_trim_rcsum(skb2, len);
1598                 if (err)
1599                         goto err_out;
1600         }
1601
1602         len -= ip_hdrlen(skb2);
1603         offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1604         __skb_pull(skb2, offset);
1605         skb_reset_transport_header(skb2);
1606
1607         err = -EINVAL;
1608         if (!pskb_may_pull(skb2, sizeof(*ih)))
1609                 goto out;
1610
1611         switch (skb2->ip_summed) {
1612         case CHECKSUM_COMPLETE:
1613                 if (!csum_fold(skb2->csum))
1614                         break;
1615                 /* fall through */
1616         case CHECKSUM_NONE:
1617                 skb2->csum = 0;
1618                 if (skb_checksum_complete(skb2))
1619                         goto out;
1620         }
1621
1622         err = 0;
1623
1624         BR_INPUT_SKB_CB(skb)->igmp = 1;
1625         ih = igmp_hdr(skb2);
1626
1627         switch (ih->type) {
1628         case IGMP_HOST_MEMBERSHIP_REPORT:
1629         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1630                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1631                 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1632                 break;
1633         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1634                 err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
1635                 break;
1636         case IGMP_HOST_MEMBERSHIP_QUERY:
1637                 err = br_ip4_multicast_query(br, port, skb2, vid);
1638                 break;
1639         case IGMP_HOST_LEAVE_MESSAGE:
1640                 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1641                 break;
1642         }
1643
1644 out:
1645         __skb_push(skb2, offset);
1646 err_out:
1647         if (skb2 != skb)
1648                 kfree_skb(skb2);
1649         return err;
1650 }
1651
1652 #if IS_ENABLED(CONFIG_IPV6)
1653 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1654                                  struct net_bridge_port *port,
1655                                  struct sk_buff *skb,
1656                                  u16 vid)
1657 {
1658         struct sk_buff *skb2;
1659         const struct ipv6hdr *ip6h;
1660         u8 icmp6_type;
1661         u8 nexthdr;
1662         __be16 frag_off;
1663         unsigned int len;
1664         int offset;
1665         int err;
1666
1667         if (!pskb_may_pull(skb, sizeof(*ip6h)))
1668                 return -EINVAL;
1669
1670         ip6h = ipv6_hdr(skb);
1671
1672         /*
1673          * We're interested in MLD messages only.
1674          *  - Version is 6
1675          *  - MLD has always Router Alert hop-by-hop option
1676          *  - But we do not support jumbrograms.
1677          */
1678         if (ip6h->version != 6)
1679                 return 0;
1680
1681         /* Prevent flooding this packet if there is no listener present */
1682         if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr))
1683                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1684
1685         if (ip6h->nexthdr != IPPROTO_HOPOPTS ||
1686             ip6h->payload_len == 0)
1687                 return 0;
1688
1689         len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1690         if (skb->len < len)
1691                 return -EINVAL;
1692
1693         nexthdr = ip6h->nexthdr;
1694         offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1695
1696         if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1697                 return 0;
1698
1699         /* Okay, we found ICMPv6 header */
1700         skb2 = skb_clone(skb, GFP_ATOMIC);
1701         if (!skb2)
1702                 return -ENOMEM;
1703
1704         err = -EINVAL;
1705         if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1706                 goto out;
1707
1708         len -= offset - skb_network_offset(skb2);
1709
1710         __skb_pull(skb2, offset);
1711         skb_reset_transport_header(skb2);
1712         skb_postpull_rcsum(skb2, skb_network_header(skb2),
1713                            skb_network_header_len(skb2));
1714
1715         icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1716
1717         switch (icmp6_type) {
1718         case ICMPV6_MGM_QUERY:
1719         case ICMPV6_MGM_REPORT:
1720         case ICMPV6_MGM_REDUCTION:
1721         case ICMPV6_MLD2_REPORT:
1722                 break;
1723         default:
1724                 err = 0;
1725                 goto out;
1726         }
1727
1728         /* Okay, we found MLD message. Check further. */
1729         if (skb2->len > len) {
1730                 err = pskb_trim_rcsum(skb2, len);
1731                 if (err)
1732                         goto out;
1733                 err = -EINVAL;
1734         }
1735
1736         ip6h = ipv6_hdr(skb2);
1737
1738         switch (skb2->ip_summed) {
1739         case CHECKSUM_COMPLETE:
1740                 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1741                                         IPPROTO_ICMPV6, skb2->csum))
1742                         break;
1743                 /*FALLTHROUGH*/
1744         case CHECKSUM_NONE:
1745                 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1746                                                         &ip6h->daddr,
1747                                                         skb2->len,
1748                                                         IPPROTO_ICMPV6, 0));
1749                 if (__skb_checksum_complete(skb2))
1750                         goto out;
1751         }
1752
1753         err = 0;
1754
1755         BR_INPUT_SKB_CB(skb)->igmp = 1;
1756
1757         switch (icmp6_type) {
1758         case ICMPV6_MGM_REPORT:
1759             {
1760                 struct mld_msg *mld;
1761                 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1762                         err = -EINVAL;
1763                         goto out;
1764                 }
1765                 mld = (struct mld_msg *)skb_transport_header(skb2);
1766                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1767                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1768                 break;
1769             }
1770         case ICMPV6_MLD2_REPORT:
1771                 err = br_ip6_multicast_mld2_report(br, port, skb2, vid);
1772                 break;
1773         case ICMPV6_MGM_QUERY:
1774                 err = br_ip6_multicast_query(br, port, skb2, vid);
1775                 break;
1776         case ICMPV6_MGM_REDUCTION:
1777             {
1778                 struct mld_msg *mld;
1779                 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1780                         err = -EINVAL;
1781                         goto out;
1782                 }
1783                 mld = (struct mld_msg *)skb_transport_header(skb2);
1784                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1785             }
1786         }
1787
1788 out:
1789         kfree_skb(skb2);
1790         return err;
1791 }
1792 #endif
1793
1794 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1795                      struct sk_buff *skb, u16 vid)
1796 {
1797         BR_INPUT_SKB_CB(skb)->igmp = 0;
1798         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1799
1800         if (br->multicast_disabled)
1801                 return 0;
1802
1803         switch (skb->protocol) {
1804         case htons(ETH_P_IP):
1805                 return br_multicast_ipv4_rcv(br, port, skb, vid);
1806 #if IS_ENABLED(CONFIG_IPV6)
1807         case htons(ETH_P_IPV6):
1808                 return br_multicast_ipv6_rcv(br, port, skb, vid);
1809 #endif
1810         }
1811
1812         return 0;
1813 }
1814
1815 static void br_multicast_query_expired(struct net_bridge *br,
1816                                        struct bridge_mcast_own_query *query,
1817                                        struct bridge_mcast_querier *querier)
1818 {
1819         spin_lock(&br->multicast_lock);
1820         if (query->startup_sent < br->multicast_startup_query_count)
1821                 query->startup_sent++;
1822
1823         RCU_INIT_POINTER(querier->port, NULL);
1824         br_multicast_send_query(br, NULL, query);
1825         spin_unlock(&br->multicast_lock);
1826 }
1827
1828 static void br_ip4_multicast_query_expired(unsigned long data)
1829 {
1830         struct net_bridge *br = (void *)data;
1831
1832         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1833 }
1834
1835 #if IS_ENABLED(CONFIG_IPV6)
1836 static void br_ip6_multicast_query_expired(unsigned long data)
1837 {
1838         struct net_bridge *br = (void *)data;
1839
1840         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1841 }
1842 #endif
1843
1844 void br_multicast_init(struct net_bridge *br)
1845 {
1846         br->hash_elasticity = 4;
1847         br->hash_max = 512;
1848
1849         br->multicast_router = 1;
1850         br->multicast_querier = 0;
1851         br->multicast_query_use_ifaddr = 0;
1852         br->multicast_last_member_count = 2;
1853         br->multicast_startup_query_count = 2;
1854
1855         br->multicast_last_member_interval = HZ;
1856         br->multicast_query_response_interval = 10 * HZ;
1857         br->multicast_startup_query_interval = 125 * HZ / 4;
1858         br->multicast_query_interval = 125 * HZ;
1859         br->multicast_querier_interval = 255 * HZ;
1860         br->multicast_membership_interval = 260 * HZ;
1861
1862         br->ip4_other_query.delay_time = 0;
1863         br->ip4_querier.port = NULL;
1864 #if IS_ENABLED(CONFIG_IPV6)
1865         br->ip6_other_query.delay_time = 0;
1866         br->ip6_querier.port = NULL;
1867 #endif
1868
1869         spin_lock_init(&br->multicast_lock);
1870         setup_timer(&br->multicast_router_timer,
1871                     br_multicast_local_router_expired, 0);
1872         setup_timer(&br->ip4_other_query.timer,
1873                     br_ip4_multicast_querier_expired, (unsigned long)br);
1874         setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1875                     (unsigned long)br);
1876 #if IS_ENABLED(CONFIG_IPV6)
1877         setup_timer(&br->ip6_other_query.timer,
1878                     br_ip6_multicast_querier_expired, (unsigned long)br);
1879         setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1880                     (unsigned long)br);
1881 #endif
1882 }
1883
1884 static void __br_multicast_open(struct net_bridge *br,
1885                                 struct bridge_mcast_own_query *query)
1886 {
1887         query->startup_sent = 0;
1888
1889         if (br->multicast_disabled)
1890                 return;
1891
1892         mod_timer(&query->timer, jiffies);
1893 }
1894
1895 void br_multicast_open(struct net_bridge *br)
1896 {
1897         __br_multicast_open(br, &br->ip4_own_query);
1898 #if IS_ENABLED(CONFIG_IPV6)
1899         __br_multicast_open(br, &br->ip6_own_query);
1900 #endif
1901 }
1902
1903 void br_multicast_stop(struct net_bridge *br)
1904 {
1905         struct net_bridge_mdb_htable *mdb;
1906         struct net_bridge_mdb_entry *mp;
1907         struct hlist_node *n;
1908         u32 ver;
1909         int i;
1910
1911         del_timer_sync(&br->multicast_router_timer);
1912         del_timer_sync(&br->ip4_other_query.timer);
1913         del_timer_sync(&br->ip4_own_query.timer);
1914 #if IS_ENABLED(CONFIG_IPV6)
1915         del_timer_sync(&br->ip6_other_query.timer);
1916         del_timer_sync(&br->ip6_own_query.timer);
1917 #endif
1918
1919         spin_lock_bh(&br->multicast_lock);
1920         mdb = mlock_dereference(br->mdb, br);
1921         if (!mdb)
1922                 goto out;
1923
1924         br->mdb = NULL;
1925
1926         ver = mdb->ver;
1927         for (i = 0; i < mdb->max; i++) {
1928                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1929                                           hlist[ver]) {
1930                         del_timer(&mp->timer);
1931                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
1932                 }
1933         }
1934
1935         if (mdb->old) {
1936                 spin_unlock_bh(&br->multicast_lock);
1937                 rcu_barrier_bh();
1938                 spin_lock_bh(&br->multicast_lock);
1939                 WARN_ON(mdb->old);
1940         }
1941
1942         mdb->old = mdb;
1943         call_rcu_bh(&mdb->rcu, br_mdb_free);
1944
1945 out:
1946         spin_unlock_bh(&br->multicast_lock);
1947 }
1948
1949 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1950 {
1951         int err = -ENOENT;
1952
1953         spin_lock_bh(&br->multicast_lock);
1954         if (!netif_running(br->dev))
1955                 goto unlock;
1956
1957         switch (val) {
1958         case 0:
1959         case 2:
1960                 del_timer(&br->multicast_router_timer);
1961                 /* fall through */
1962         case 1:
1963                 br->multicast_router = val;
1964                 err = 0;
1965                 break;
1966
1967         default:
1968                 err = -EINVAL;
1969                 break;
1970         }
1971
1972 unlock:
1973         spin_unlock_bh(&br->multicast_lock);
1974
1975         return err;
1976 }
1977
1978 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1979 {
1980         struct net_bridge *br = p->br;
1981         int err = -ENOENT;
1982
1983         spin_lock(&br->multicast_lock);
1984         if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1985                 goto unlock;
1986
1987         switch (val) {
1988         case 0:
1989         case 1:
1990         case 2:
1991                 p->multicast_router = val;
1992                 err = 0;
1993
1994                 if (val < 2 && !hlist_unhashed(&p->rlist))
1995                         hlist_del_init_rcu(&p->rlist);
1996
1997                 if (val == 1)
1998                         break;
1999
2000                 del_timer(&p->multicast_router_timer);
2001
2002                 if (val == 0)
2003                         break;
2004
2005                 br_multicast_add_router(br, p);
2006                 break;
2007
2008         default:
2009                 err = -EINVAL;
2010                 break;
2011         }
2012
2013 unlock:
2014         spin_unlock(&br->multicast_lock);
2015
2016         return err;
2017 }
2018
2019 static void br_multicast_start_querier(struct net_bridge *br,
2020                                        struct bridge_mcast_own_query *query)
2021 {
2022         struct net_bridge_port *port;
2023
2024         __br_multicast_open(br, query);
2025
2026         list_for_each_entry(port, &br->port_list, list) {
2027                 if (port->state == BR_STATE_DISABLED ||
2028                     port->state == BR_STATE_BLOCKING)
2029                         continue;
2030
2031                 if (query == &br->ip4_own_query)
2032                         br_multicast_enable(&port->ip4_own_query);
2033 #if IS_ENABLED(CONFIG_IPV6)
2034                 else
2035                         br_multicast_enable(&port->ip6_own_query);
2036 #endif
2037         }
2038 }
2039
2040 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2041 {
2042         int err = 0;
2043         struct net_bridge_mdb_htable *mdb;
2044
2045         spin_lock_bh(&br->multicast_lock);
2046         if (br->multicast_disabled == !val)
2047                 goto unlock;
2048
2049         br->multicast_disabled = !val;
2050         if (br->multicast_disabled)
2051                 goto unlock;
2052
2053         if (!netif_running(br->dev))
2054                 goto unlock;
2055
2056         mdb = mlock_dereference(br->mdb, br);
2057         if (mdb) {
2058                 if (mdb->old) {
2059                         err = -EEXIST;
2060 rollback:
2061                         br->multicast_disabled = !!val;
2062                         goto unlock;
2063                 }
2064
2065                 err = br_mdb_rehash(&br->mdb, mdb->max,
2066                                     br->hash_elasticity);
2067                 if (err)
2068                         goto rollback;
2069         }
2070
2071         br_multicast_start_querier(br, &br->ip4_own_query);
2072 #if IS_ENABLED(CONFIG_IPV6)
2073         br_multicast_start_querier(br, &br->ip6_own_query);
2074 #endif
2075
2076 unlock:
2077         spin_unlock_bh(&br->multicast_lock);
2078
2079         return err;
2080 }
2081
2082 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2083 {
2084         unsigned long max_delay;
2085
2086         val = !!val;
2087
2088         spin_lock_bh(&br->multicast_lock);
2089         if (br->multicast_querier == val)
2090                 goto unlock;
2091
2092         br->multicast_querier = val;
2093         if (!val)
2094                 goto unlock;
2095
2096         max_delay = br->multicast_query_response_interval;
2097
2098         if (!timer_pending(&br->ip4_other_query.timer))
2099                 br->ip4_other_query.delay_time = jiffies + max_delay;
2100
2101         br_multicast_start_querier(br, &br->ip4_own_query);
2102
2103 #if IS_ENABLED(CONFIG_IPV6)
2104         if (!timer_pending(&br->ip6_other_query.timer))
2105                 br->ip6_other_query.delay_time = jiffies + max_delay;
2106
2107         br_multicast_start_querier(br, &br->ip6_own_query);
2108 #endif
2109
2110 unlock:
2111         spin_unlock_bh(&br->multicast_lock);
2112
2113         return 0;
2114 }
2115
2116 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2117 {
2118         int err = -ENOENT;
2119         u32 old;
2120         struct net_bridge_mdb_htable *mdb;
2121
2122         spin_lock_bh(&br->multicast_lock);
2123         if (!netif_running(br->dev))
2124                 goto unlock;
2125
2126         err = -EINVAL;
2127         if (!is_power_of_2(val))
2128                 goto unlock;
2129
2130         mdb = mlock_dereference(br->mdb, br);
2131         if (mdb && val < mdb->size)
2132                 goto unlock;
2133
2134         err = 0;
2135
2136         old = br->hash_max;
2137         br->hash_max = val;
2138
2139         if (mdb) {
2140                 if (mdb->old) {
2141                         err = -EEXIST;
2142 rollback:
2143                         br->hash_max = old;
2144                         goto unlock;
2145                 }
2146
2147                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2148                                     br->hash_elasticity);
2149                 if (err)
2150                         goto rollback;
2151         }
2152
2153 unlock:
2154         spin_unlock_bh(&br->multicast_lock);
2155
2156         return err;
2157 }
2158
2159 /**
2160  * br_multicast_list_adjacent - Returns snooped multicast addresses
2161  * @dev:        The bridge port adjacent to which to retrieve addresses
2162  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2163  *
2164  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2165  * snooping feature on all bridge ports of dev's bridge device, excluding
2166  * the addresses from dev itself.
2167  *
2168  * Returns the number of items added to br_ip_list.
2169  *
2170  * Notes:
2171  * - br_ip_list needs to be initialized by caller
2172  * - br_ip_list might contain duplicates in the end
2173  *   (needs to be taken care of by caller)
2174  * - br_ip_list needs to be freed by caller
2175  */
2176 int br_multicast_list_adjacent(struct net_device *dev,
2177                                struct list_head *br_ip_list)
2178 {
2179         struct net_bridge *br;
2180         struct net_bridge_port *port;
2181         struct net_bridge_port_group *group;
2182         struct br_ip_list *entry;
2183         int count = 0;
2184
2185         rcu_read_lock();
2186         if (!br_ip_list || !br_port_exists(dev))
2187                 goto unlock;
2188
2189         port = br_port_get_rcu(dev);
2190         if (!port || !port->br)
2191                 goto unlock;
2192
2193         br = port->br;
2194
2195         list_for_each_entry_rcu(port, &br->port_list, list) {
2196                 if (!port->dev || port->dev == dev)
2197                         continue;
2198
2199                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2200                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2201                         if (!entry)
2202                                 goto unlock;
2203
2204                         entry->addr = group->addr;
2205                         list_add(&entry->list, br_ip_list);
2206                         count++;
2207                 }
2208         }
2209
2210 unlock:
2211         rcu_read_unlock();
2212         return count;
2213 }
2214 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2215
2216 /**
2217  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2218  * @dev: The bridge port providing the bridge on which to check for a querier
2219  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2220  *
2221  * Checks whether the given interface has a bridge on top and if so returns
2222  * true if a valid querier exists anywhere on the bridged link layer.
2223  * Otherwise returns false.
2224  */
2225 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2226 {
2227         struct net_bridge *br;
2228         struct net_bridge_port *port;
2229         struct ethhdr eth;
2230         bool ret = false;
2231
2232         rcu_read_lock();
2233         if (!br_port_exists(dev))
2234                 goto unlock;
2235
2236         port = br_port_get_rcu(dev);
2237         if (!port || !port->br)
2238                 goto unlock;
2239
2240         br = port->br;
2241
2242         memset(&eth, 0, sizeof(eth));
2243         eth.h_proto = htons(proto);
2244
2245         ret = br_multicast_querier_exists(br, &eth);
2246
2247 unlock:
2248         rcu_read_unlock();
2249         return ret;
2250 }
2251 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2252
2253 /**
2254  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2255  * @dev: The bridge port adjacent to which to check for a querier
2256  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2257  *
2258  * Checks whether the given interface has a bridge on top and if so returns
2259  * true if a selected querier is behind one of the other ports of this
2260  * bridge. Otherwise returns false.
2261  */
2262 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2263 {
2264         struct net_bridge *br;
2265         struct net_bridge_port *port;
2266         bool ret = false;
2267
2268         rcu_read_lock();
2269         if (!br_port_exists(dev))
2270                 goto unlock;
2271
2272         port = br_port_get_rcu(dev);
2273         if (!port || !port->br)
2274                 goto unlock;
2275
2276         br = port->br;
2277
2278         switch (proto) {
2279         case ETH_P_IP:
2280                 if (!timer_pending(&br->ip4_other_query.timer) ||
2281                     rcu_dereference(br->ip4_querier.port) == port)
2282                         goto unlock;
2283                 break;
2284 #if IS_ENABLED(CONFIG_IPV6)
2285         case ETH_P_IPV6:
2286                 if (!timer_pending(&br->ip6_other_query.timer) ||
2287                     rcu_dereference(br->ip6_querier.port) == port)
2288                         goto unlock;
2289                 break;
2290 #endif
2291         default:
2292                 goto unlock;
2293         }
2294
2295         ret = true;
2296 unlock:
2297         rcu_read_unlock();
2298         return ret;
2299 }
2300 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);