net/bridge/br_multicast.c

   1 /*
   2  * Bridge multicast support.
   3  *
   4  * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/export.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/igmp.h>
  17 #include <linux/jhash.h>
  18 #include <linux/kernel.h>
  19 #include <linux/log2.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/netfilter_bridge.h>
  22 #include <linux/random.h>
  23 #include <linux/rculist.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/slab.h>
  26 #include <linux/timer.h>
  27 #include <linux/inetdevice.h>
  28 #include <net/ip.h>
  29 #if IS_ENABLED(CONFIG_IPV6)
  30 #include <net/ipv6.h>
  31 #include <net/mld.h>
  32 #include <net/ip6_checksum.h>
  33 #include <net/addrconf.h>
  34 #endif
  35
  36 #include "br_private.h"
  37
  38 static void br_multicast_start_querier(struct net_bridge *br,
  39                                        struct bridge_mcast_own_query *query);
  40 static void br_multicast_add_router(struct net_bridge *br,
  41                                     struct net_bridge_port *port);
  42 static void br_ip4_multicast_leave_group(struct net_bridge *br,
  43                                          struct net_bridge_port *port,
  44                                          __be32 group,
  45                                          __u16 vid);
  46 #if IS_ENABLED(CONFIG_IPV6)
  47 static void br_ip6_multicast_leave_group(struct net_bridge *br,
  48                                          struct net_bridge_port *port,
  49                                          const struct in6_addr *group,
  50                                          __u16 vid);
  51 #endif
  52 unsigned int br_mdb_rehash_seq;
  53
  54 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
  55 {
  56         if (a->proto != b->proto)
  57                 return 0;
  58         if (a->vid != b->vid)
  59                 return 0;
  60         switch (a->proto) {
  61         case htons(ETH_P_IP):
  62                 return a->u.ip4 == b->u.ip4;
  63 #if IS_ENABLED(CONFIG_IPV6)
  64         case htons(ETH_P_IPV6):
  65                 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
  66 #endif
  67         }
  68         return 0;
  69 }
  70
  71 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
  72                                 __u16 vid)
  73 {
  74         return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
  75 }
  76
  77 #if IS_ENABLED(CONFIG_IPV6)
  78 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
  79                                 const struct in6_addr *ip,
  80                                 __u16 vid)
  81 {
  82         return jhash_2words(ipv6_addr_hash(ip), vid,
  83                             mdb->secret) & (mdb->max - 1);
  84 }
  85 #endif
  86
  87 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
  88                              struct br_ip *ip)
  89 {
  90         switch (ip->proto) {
  91         case htons(ETH_P_IP):
  92                 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
  93 #if IS_ENABLED(CONFIG_IPV6)
  94         case htons(ETH_P_IPV6):
  95                 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
  96 #endif
  97         }
  98         return 0;
  99 }
 100
 101 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
 102         struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
 103 {
 104         struct net_bridge_mdb_entry *mp;
 105
 106         hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 107                 if (br_ip_equal(&mp->addr, dst))
 108                         return mp;
 109         }
 110
 111         return NULL;
 112 }
 113
 114 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
 115                                            struct br_ip *dst)
 116 {
 117         if (!mdb)
 118                 return NULL;
 119
 120         return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
 121 }
 122
 123 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
 124         struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
 125 {
 126         struct br_ip br_dst;
 127
 128         br_dst.u.ip4 = dst;
 129         br_dst.proto = htons(ETH_P_IP);
 130         br_dst.vid = vid;
 131
 132         return br_mdb_ip_get(mdb, &br_dst);
 133 }
 134
 135 #if IS_ENABLED(CONFIG_IPV6)
 136 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
 137         struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
 138         __u16 vid)
 139 {
 140         struct br_ip br_dst;
 141
 142         br_dst.u.ip6 = *dst;
 143         br_dst.proto = htons(ETH_P_IPV6);
 144         br_dst.vid = vid;
 145
 146         return br_mdb_ip_get(mdb, &br_dst);
 147 }
 148 #endif
 149
 150 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 151                                         struct sk_buff *skb, u16 vid)
 152 {
 153         struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
 154         struct br_ip ip;
 155
 156         if (br->multicast_disabled)
 157                 return NULL;
 158
 159         if (BR_INPUT_SKB_CB(skb)->igmp)
 160                 return NULL;
 161
 162         ip.proto = skb->protocol;
 163         ip.vid = vid;
 164
 165         switch (skb->protocol) {
 166         case htons(ETH_P_IP):
 167                 ip.u.ip4 = ip_hdr(skb)->daddr;
 168                 break;
 169 #if IS_ENABLED(CONFIG_IPV6)
 170         case htons(ETH_P_IPV6):
 171                 ip.u.ip6 = ipv6_hdr(skb)->daddr;
 172                 break;
 173 #endif
 174         default:
 175                 return NULL;
 176         }
 177
 178         return br_mdb_ip_get(mdb, &ip);
 179 }
 180
 181 static void br_mdb_free(struct rcu_head *head)
 182 {
 183         struct net_bridge_mdb_htable *mdb =
 184                 container_of(head, struct net_bridge_mdb_htable, rcu);
 185         struct net_bridge_mdb_htable *old = mdb->old;
 186
 187         mdb->old = NULL;
 188         kfree(old->mhash);
 189         kfree(old);
 190 }
 191
 192 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
 193                        struct net_bridge_mdb_htable *old,
 194                        int elasticity)
 195 {
 196         struct net_bridge_mdb_entry *mp;
 197         int maxlen;
 198         int len;
 199         int i;
 200
 201         for (i = 0; i < old->max; i++)
 202                 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
 203                         hlist_add_head(&mp->hlist[new->ver],
 204                                        &new->mhash[br_ip_hash(new, &mp->addr)]);
 205
 206         if (!elasticity)
 207                 return 0;
 208
 209         maxlen = 0;
 210         for (i = 0; i < new->max; i++) {
 211                 len = 0;
 212                 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
 213                         len++;
 214                 if (len > maxlen)
 215                         maxlen = len;
 216         }
 217
 218         return maxlen > elasticity ? -EINVAL : 0;
 219 }
 220
 221 void br_multicast_free_pg(struct rcu_head *head)
 222 {
 223         struct net_bridge_port_group *p =
 224                 container_of(head, struct net_bridge_port_group, rcu);
 225
 226         kfree(p);
 227 }
 228
 229 static void br_multicast_free_group(struct rcu_head *head)
 230 {
 231         struct net_bridge_mdb_entry *mp =
 232                 container_of(head, struct net_bridge_mdb_entry, rcu);
 233
 234         kfree(mp);
 235 }
 236
 237 static void br_multicast_group_expired(unsigned long data)
 238 {
 239         struct net_bridge_mdb_entry *mp = (void *)data;
 240         struct net_bridge *br = mp->br;
 241         struct net_bridge_mdb_htable *mdb;
 242
 243         spin_lock(&br->multicast_lock);
 244         if (!netif_running(br->dev) || timer_pending(&mp->timer))
 245                 goto out;
 246
 247         mp->mglist = false;
 248
 249         if (mp->ports)
 250                 goto out;
 251
 252         mdb = mlock_dereference(br->mdb, br);
 253
 254         hlist_del_rcu(&mp->hlist[mdb->ver]);
 255         mdb->size--;
 256
 257         call_rcu_bh(&mp->rcu, br_multicast_free_group);
 258
 259 out:
 260         spin_unlock(&br->multicast_lock);
 261 }
 262
 263 static void br_multicast_del_pg(struct net_bridge *br,
 264                                 struct net_bridge_port_group *pg)
 265 {
 266         struct net_bridge_mdb_htable *mdb;
 267         struct net_bridge_mdb_entry *mp;
 268         struct net_bridge_port_group *p;
 269         struct net_bridge_port_group __rcu **pp;
 270
 271         mdb = mlock_dereference(br->mdb, br);
 272
 273         mp = br_mdb_ip_get(mdb, &pg->addr);
 274         if (WARN_ON(!mp))
 275                 return;
 276
 277         for (pp = &mp->ports;
 278              (p = mlock_dereference(*pp, br)) != NULL;
 279              pp = &p->next) {
 280                 if (p != pg)
 281                         continue;
 282
 283                 rcu_assign_pointer(*pp, p->next);
 284                 hlist_del_init(&p->mglist);
 285                 del_timer(&p->timer);
 286                 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
 287                               p->flags);
 288                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
 289
 290                 if (!mp->ports && !mp->mglist &&
 291                     netif_running(br->dev))
 292                         mod_timer(&mp->timer, jiffies);
 293
 294                 return;
 295         }
 296
 297         WARN_ON(1);
 298 }
 299
 300 static void br_multicast_port_group_expired(unsigned long data)
 301 {
 302         struct net_bridge_port_group *pg = (void *)data;
 303         struct net_bridge *br = pg->port->br;
 304
 305         spin_lock(&br->multicast_lock);
 306         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
 307             hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
 308                 goto out;
 309
 310         br_multicast_del_pg(br, pg);
 311
 312 out:
 313         spin_unlock(&br->multicast_lock);
 314 }
 315
 316 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
 317                          int elasticity)
 318 {
 319         struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
 320         struct net_bridge_mdb_htable *mdb;
 321         int err;
 322
 323         mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
 324         if (!mdb)
 325                 return -ENOMEM;
 326
 327         mdb->max = max;
 328         mdb->old = old;
 329
 330         mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
 331         if (!mdb->mhash) {
 332                 kfree(mdb);
 333                 return -ENOMEM;
 334         }
 335
 336         mdb->size = old ? old->size : 0;
 337         mdb->ver = old ? old->ver ^ 1 : 0;
 338
 339         if (!old || elasticity)
 340                 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
 341         else
 342                 mdb->secret = old->secret;
 343
 344         if (!old)
 345                 goto out;
 346
 347         err = br_mdb_copy(mdb, old, elasticity);
 348         if (err) {
 349                 kfree(mdb->mhash);
 350                 kfree(mdb);
 351                 return err;
 352         }
 353
 354         br_mdb_rehash_seq++;
 355         call_rcu_bh(&mdb->rcu, br_mdb_free);
 356
 357 out:
 358         rcu_assign_pointer(*mdbp, mdb);
 359
 360         return 0;
 361 }
 362
 363 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
 364                                                     __be32 group)
 365 {
 366         struct sk_buff *skb;
 367         struct igmphdr *ih;
 368         struct ethhdr *eth;
 369         struct iphdr *iph;
 370
 371         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
 372                                                  sizeof(*ih) + 4);
 373         if (!skb)
 374                 goto out;
 375
 376         skb->protocol = htons(ETH_P_IP);
 377
 378         skb_reset_mac_header(skb);
 379         eth = eth_hdr(skb);
 380
 381         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 382         eth->h_dest[0] = 1;
 383         eth->h_dest[1] = 0;
 384         eth->h_dest[2] = 0x5e;
 385         eth->h_dest[3] = 0;
 386         eth->h_dest[4] = 0;
 387         eth->h_dest[5] = 1;
 388         eth->h_proto = htons(ETH_P_IP);
 389         skb_put(skb, sizeof(*eth));
 390
 391         skb_set_network_header(skb, skb->len);
 392         iph = ip_hdr(skb);
 393
 394         iph->version = 4;
 395         iph->ihl = 6;
 396         iph->tos = 0xc0;
 397         iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
 398         iph->id = 0;
 399         iph->frag_off = htons(IP_DF);
 400         iph->ttl = 1;
 401         iph->protocol = IPPROTO_IGMP;
 402         iph->saddr = br->multicast_query_use_ifaddr ?
 403                      inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
 404         iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 405         ((u8 *)&iph[1])[0] = IPOPT_RA;
 406         ((u8 *)&iph[1])[1] = 4;
 407         ((u8 *)&iph[1])[2] = 0;
 408         ((u8 *)&iph[1])[3] = 0;
 409         ip_send_check(iph);
 410         skb_put(skb, 24);
 411
 412         skb_set_transport_header(skb, skb->len);
 413         ih = igmp_hdr(skb);
 414         ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
 415         ih->code = (group ? br->multicast_last_member_interval :
 416                             br->multicast_query_response_interval) /
 417                    (HZ / IGMP_TIMER_SCALE);
 418         ih->group = group;
 419         ih->csum = 0;
 420         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 421         skb_put(skb, sizeof(*ih));
 422
 423         __skb_pull(skb, sizeof(*eth));
 424
 425 out:
 426         return skb;
 427 }
 428
 429 #if IS_ENABLED(CONFIG_IPV6)
 430 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
 431                                                     const struct in6_addr *group)
 432 {
 433         struct sk_buff *skb;
 434         struct ipv6hdr *ip6h;
 435         struct mld_msg *mldq;
 436         struct ethhdr *eth;
 437         u8 *hopopt;
 438         unsigned long interval;
 439
 440         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
 441                                                  8 + sizeof(*mldq));
 442         if (!skb)
 443                 goto out;
 444
 445         skb->protocol = htons(ETH_P_IPV6);
 446
 447         /* Ethernet header */
 448         skb_reset_mac_header(skb);
 449         eth = eth_hdr(skb);
 450
 451         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 452         eth->h_proto = htons(ETH_P_IPV6);
 453         skb_put(skb, sizeof(*eth));
 454
 455         /* IPv6 header + HbH option */
 456         skb_set_network_header(skb, skb->len);
 457         ip6h = ipv6_hdr(skb);
 458
 459         *(__force __be32 *)ip6h = htonl(0x60000000);
 460         ip6h->payload_len = htons(8 + sizeof(*mldq));
 461         ip6h->nexthdr = IPPROTO_HOPOPTS;
 462         ip6h->hop_limit = 1;
 463         ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
 464         if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
 465                                &ip6h->saddr)) {
 466                 kfree_skb(skb);
 467                 br->has_ipv6_addr = 0;
 468                 return NULL;
 469         }
 470
 471         br->has_ipv6_addr = 1;
 472         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 473
 474         hopopt = (u8 *)(ip6h + 1);
 475         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
 476         hopopt[1] = 0;                          /* length of HbH */
 477         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
 478         hopopt[3] = 2;                          /* Length of RA Option */
 479         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
 480         hopopt[5] = 0;
 481         hopopt[6] = IPV6_TLV_PAD1;              /* Pad1 */
 482         hopopt[7] = IPV6_TLV_PAD1;              /* Pad1 */
 483
 484         skb_put(skb, sizeof(*ip6h) + 8);
 485
 486         /* ICMPv6 */
 487         skb_set_transport_header(skb, skb->len);
 488         mldq = (struct mld_msg *) icmp6_hdr(skb);
 489
 490         interval = ipv6_addr_any(group) ?
 491                         br->multicast_query_response_interval :
 492                         br->multicast_last_member_interval;
 493
 494         mldq->mld_type = ICMPV6_MGM_QUERY;
 495         mldq->mld_code = 0;
 496         mldq->mld_cksum = 0;
 497         mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
 498         mldq->mld_reserved = 0;
 499         mldq->mld_mca = *group;
 500
 501         /* checksum */
 502         mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 503                                           sizeof(*mldq), IPPROTO_ICMPV6,
 504                                           csum_partial(mldq,
 505                                                        sizeof(*mldq), 0));
 506         skb_put(skb, sizeof(*mldq));
 507
 508         __skb_pull(skb, sizeof(*eth));
 509
 510 out:
 511         return skb;
 512 }
 513 #endif
 514
 515 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 516                                                 struct br_ip *addr)
 517 {
 518         switch (addr->proto) {
 519         case htons(ETH_P_IP):
 520                 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
 521 #if IS_ENABLED(CONFIG_IPV6)
 522         case htons(ETH_P_IPV6):
 523                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
 524 #endif
 525         }
 526         return NULL;
 527 }
 528
 529 static struct net_bridge_mdb_entry *br_multicast_get_group(
 530         struct net_bridge *br, struct net_bridge_port *port,
 531         struct br_ip *group, int hash)
 532 {
 533         struct net_bridge_mdb_htable *mdb;
 534         struct net_bridge_mdb_entry *mp;
 535         unsigned int count = 0;
 536         unsigned int max;
 537         int elasticity;
 538         int err;
 539
 540         mdb = rcu_dereference_protected(br->mdb, 1);
 541         hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 542                 count++;
 543                 if (unlikely(br_ip_equal(group, &mp->addr)))
 544                         return mp;
 545         }
 546
 547         elasticity = 0;
 548         max = mdb->max;
 549
 550         if (unlikely(count > br->hash_elasticity && count)) {
 551                 if (net_ratelimit())
 552                         br_info(br, "Multicast hash table "
 553                                 "chain limit reached: %s\n",
 554                                 port ? port->dev->name : br->dev->name);
 555
 556                 elasticity = br->hash_elasticity;
 557         }
 558
 559         if (mdb->size >= max) {
 560                 max *= 2;
 561                 if (unlikely(max > br->hash_max)) {
 562                         br_warn(br, "Multicast hash table maximum of %d "
 563                                 "reached, disabling snooping: %s\n",
 564                                 br->hash_max,
 565                                 port ? port->dev->name : br->dev->name);
 566                         err = -E2BIG;
 567 disable:
 568                         br->multicast_disabled = 1;
 569                         goto err;
 570                 }
 571         }
 572
 573         if (max > mdb->max || elasticity) {
 574                 if (mdb->old) {
 575                         if (net_ratelimit())
 576                                 br_info(br, "Multicast hash table "
 577                                         "on fire: %s\n",
 578                                         port ? port->dev->name : br->dev->name);
 579                         err = -EEXIST;
 580                         goto err;
 581                 }
 582
 583                 err = br_mdb_rehash(&br->mdb, max, elasticity);
 584                 if (err) {
 585                         br_warn(br, "Cannot rehash multicast "
 586                                 "hash table, disabling snooping: %s, %d, %d\n",
 587                                 port ? port->dev->name : br->dev->name,
 588                                 mdb->size, err);
 589                         goto disable;
 590                 }
 591
 592                 err = -EAGAIN;
 593                 goto err;
 594         }
 595
 596         return NULL;
 597
 598 err:
 599         mp = ERR_PTR(err);
 600         return mp;
 601 }
 602
 603 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 604         struct net_bridge_port *port, struct br_ip *group)
 605 {
 606         struct net_bridge_mdb_htable *mdb;
 607         struct net_bridge_mdb_entry *mp;
 608         int hash;
 609         int err;
 610
 611         mdb = rcu_dereference_protected(br->mdb, 1);
 612         if (!mdb) {
 613                 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
 614                 if (err)
 615                         return ERR_PTR(err);
 616                 goto rehash;
 617         }
 618
 619         hash = br_ip_hash(mdb, group);
 620         mp = br_multicast_get_group(br, port, group, hash);
 621         switch (PTR_ERR(mp)) {
 622         case 0:
 623                 break;
 624
 625         case -EAGAIN:
 626 rehash:
 627                 mdb = rcu_dereference_protected(br->mdb, 1);
 628                 hash = br_ip_hash(mdb, group);
 629                 break;
 630
 631         default:
 632                 goto out;
 633         }
 634
 635         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 636         if (unlikely(!mp))
 637                 return ERR_PTR(-ENOMEM);
 638
 639         mp->br = br;
 640         mp->addr = *group;
 641         setup_timer(&mp->timer, br_multicast_group_expired,
 642                     (unsigned long)mp);
 643
 644         hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
 645         mdb->size++;
 646
 647 out:
 648         return mp;
 649 }
 650
 651 struct net_bridge_port_group *br_multicast_new_port_group(
 652                         struct net_bridge_port *port,
 653                         struct br_ip *group,
 654                         struct net_bridge_port_group __rcu *next,
 655                         unsigned char flags)
 656 {
 657         struct net_bridge_port_group *p;
 658
 659         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 660         if (unlikely(!p))
 661                 return NULL;
 662
 663         p->addr = *group;
 664         p->port = port;
 665         p->flags = flags;
 666         rcu_assign_pointer(p->next, next);
 667         hlist_add_head(&p->mglist, &port->mglist);
 668         setup_timer(&p->timer, br_multicast_port_group_expired,
 669                     (unsigned long)p);
 670         return p;
 671 }
 672
 673 static int br_multicast_add_group(struct net_bridge *br,
 674                                   struct net_bridge_port *port,
 675                                   struct br_ip *group)
 676 {
 677         struct net_bridge_mdb_entry *mp;
 678         struct net_bridge_port_group *p;
 679         struct net_bridge_port_group __rcu **pp;
 680         unsigned long now = jiffies;
 681         int err;
 682
 683         spin_lock(&br->multicast_lock);
 684         if (!netif_running(br->dev) ||
 685             (port && port->state == BR_STATE_DISABLED))
 686                 goto out;
 687
 688         mp = br_multicast_new_group(br, port, group);
 689         err = PTR_ERR(mp);
 690         if (IS_ERR(mp))
 691                 goto err;
 692
 693         if (!port) {
 694                 mp->mglist = true;
 695                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
 696                 goto out;
 697         }
 698
 699         for (pp = &mp->ports;
 700              (p = mlock_dereference(*pp, br)) != NULL;
 701              pp = &p->next) {
 702                 if (p->port == port)
 703                         goto found;
 704                 if ((unsigned long)p->port < (unsigned long)port)
 705                         break;
 706         }
 707
 708         p = br_multicast_new_port_group(port, group, *pp, 0);
 709         if (unlikely(!p))
 710                 goto err;
 711         rcu_assign_pointer(*pp, p);
 712         br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
 713
 714 found:
 715         mod_timer(&p->timer, now + br->multicast_membership_interval);
 716 out:
 717         err = 0;
 718
 719 err:
 720         spin_unlock(&br->multicast_lock);
 721         return err;
 722 }
 723
 724 static int br_ip4_multicast_add_group(struct net_bridge *br,
 725                                       struct net_bridge_port *port,
 726                                       __be32 group,
 727                                       __u16 vid)
 728 {
 729         struct br_ip br_group;
 730
 731         if (ipv4_is_local_multicast(group))
 732                 return 0;
 733
 734         br_group.u.ip4 = group;
 735         br_group.proto = htons(ETH_P_IP);
 736         br_group.vid = vid;
 737
 738         return br_multicast_add_group(br, port, &br_group);
 739 }
 740
 741 #if IS_ENABLED(CONFIG_IPV6)
 742 static int br_ip6_multicast_add_group(struct net_bridge *br,
 743                                       struct net_bridge_port *port,
 744                                       const struct in6_addr *group,
 745                                       __u16 vid)
 746 {
 747         struct br_ip br_group;
 748
 749         if (ipv6_addr_is_ll_all_nodes(group))
 750                 return 0;
 751
 752         br_group.u.ip6 = *group;
 753         br_group.proto = htons(ETH_P_IPV6);
 754         br_group.vid = vid;
 755
 756         return br_multicast_add_group(br, port, &br_group);
 757 }
 758 #endif
 759
 760 static void br_multicast_router_expired(unsigned long data)
 761 {
 762         struct net_bridge_port *port = (void *)data;
 763         struct net_bridge *br = port->br;
 764
 765         spin_lock(&br->multicast_lock);
 766         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
 767             port->multicast_router == MDB_RTR_TYPE_PERM ||
 768             timer_pending(&port->multicast_router_timer) ||
 769             hlist_unhashed(&port->rlist))
 770                 goto out;
 771
 772         hlist_del_init_rcu(&port->rlist);
 773         br_rtr_notify(br->dev, port, RTM_DELMDB);
 774         /* Don't allow timer refresh if the router expired */
 775         if (port->multicast_router == MDB_RTR_TYPE_TEMP)
 776                 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
 777
 778 out:
 779         spin_unlock(&br->multicast_lock);
 780 }
 781
 782 static void br_multicast_local_router_expired(unsigned long data)
 783 {
 784 }
 785
 786 static void br_multicast_querier_expired(struct net_bridge *br,
 787                                          struct bridge_mcast_own_query *query)
 788 {
 789         spin_lock(&br->multicast_lock);
 790         if (!netif_running(br->dev) || br->multicast_disabled)
 791                 goto out;
 792
 793         br_multicast_start_querier(br, query);
 794
 795 out:
 796         spin_unlock(&br->multicast_lock);
 797 }
 798
 799 static void br_ip4_multicast_querier_expired(unsigned long data)
 800 {
 801         struct net_bridge *br = (void *)data;
 802
 803         br_multicast_querier_expired(br, &br->ip4_own_query);
 804 }
 805
 806 #if IS_ENABLED(CONFIG_IPV6)
 807 static void br_ip6_multicast_querier_expired(unsigned long data)
 808 {
 809         struct net_bridge *br = (void *)data;
 810
 811         br_multicast_querier_expired(br, &br->ip6_own_query);
 812 }
 813 #endif
 814
 815 static void br_multicast_select_own_querier(struct net_bridge *br,
 816                                             struct br_ip *ip,
 817                                             struct sk_buff *skb)
 818 {
 819         if (ip->proto == htons(ETH_P_IP))
 820                 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
 821 #if IS_ENABLED(CONFIG_IPV6)
 822         else
 823                 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
 824 #endif
 825 }
 826
 827 static void __br_multicast_send_query(struct net_bridge *br,
 828                                       struct net_bridge_port *port,
 829                                       struct br_ip *ip)
 830 {
 831         struct sk_buff *skb;
 832
 833         skb = br_multicast_alloc_query(br, ip);
 834         if (!skb)
 835                 return;
 836
 837         if (port) {
 838                 skb->dev = port->dev;
 839                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
 840                         dev_net(port->dev), NULL, skb, NULL, skb->dev,
 841                         br_dev_queue_push_xmit);
 842         } else {
 843                 br_multicast_select_own_querier(br, ip, skb);
 844                 netif_rx(skb);
 845         }
 846 }
 847
 848 static void br_multicast_send_query(struct net_bridge *br,
 849                                     struct net_bridge_port *port,
 850                                     struct bridge_mcast_own_query *own_query)
 851 {
 852         unsigned long time;
 853         struct br_ip br_group;
 854         struct bridge_mcast_other_query *other_query = NULL;
 855
 856         if (!netif_running(br->dev) || br->multicast_disabled ||
 857             !br->multicast_querier)
 858                 return;
 859
 860         memset(&br_group.u, 0, sizeof(br_group.u));
 861
 862         if (port ? (own_query == &port->ip4_own_query) :
 863                    (own_query == &br->ip4_own_query)) {
 864                 other_query = &br->ip4_other_query;
 865                 br_group.proto = htons(ETH_P_IP);
 866 #if IS_ENABLED(CONFIG_IPV6)
 867         } else {
 868                 other_query = &br->ip6_other_query;
 869                 br_group.proto = htons(ETH_P_IPV6);
 870 #endif
 871         }
 872
 873         if (!other_query || timer_pending(&other_query->timer))
 874                 return;
 875
 876         __br_multicast_send_query(br, port, &br_group);
 877
 878         time = jiffies;
 879         time += own_query->startup_sent < br->multicast_startup_query_count ?
 880                 br->multicast_startup_query_interval :
 881                 br->multicast_query_interval;
 882         mod_timer(&own_query->timer, time);
 883 }
 884
 885 static void
 886 br_multicast_port_query_expired(struct net_bridge_port *port,
 887                                 struct bridge_mcast_own_query *query)
 888 {
 889         struct net_bridge *br = port->br;
 890
 891         spin_lock(&br->multicast_lock);
 892         if (port->state == BR_STATE_DISABLED ||
 893             port->state == BR_STATE_BLOCKING)
 894                 goto out;
 895
 896         if (query->startup_sent < br->multicast_startup_query_count)
 897                 query->startup_sent++;
 898
 899         br_multicast_send_query(port->br, port, query);
 900
 901 out:
 902         spin_unlock(&br->multicast_lock);
 903 }
 904
 905 static void br_ip4_multicast_port_query_expired(unsigned long data)
 906 {
 907         struct net_bridge_port *port = (void *)data;
 908
 909         br_multicast_port_query_expired(port, &port->ip4_own_query);
 910 }
 911
 912 #if IS_ENABLED(CONFIG_IPV6)
 913 static void br_ip6_multicast_port_query_expired(unsigned long data)
 914 {
 915         struct net_bridge_port *port = (void *)data;
 916
 917         br_multicast_port_query_expired(port, &port->ip6_own_query);
 918 }
 919 #endif
 920
 921 void br_multicast_add_port(struct net_bridge_port *port)
 922 {
 923         port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
 924
 925         setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
 926                     (unsigned long)port);
 927         setup_timer(&port->ip4_own_query.timer,
 928                     br_ip4_multicast_port_query_expired, (unsigned long)port);
 929 #if IS_ENABLED(CONFIG_IPV6)
 930         setup_timer(&port->ip6_own_query.timer,
 931                     br_ip6_multicast_port_query_expired, (unsigned long)port);
 932 #endif
 933 }
 934
 935 void br_multicast_del_port(struct net_bridge_port *port)
 936 {
 937         struct net_bridge *br = port->br;
 938         struct net_bridge_port_group *pg;
 939         struct hlist_node *n;
 940
 941         /* Take care of the remaining groups, only perm ones should be left */
 942         spin_lock_bh(&br->multicast_lock);
 943         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 944                 br_multicast_del_pg(br, pg);
 945         spin_unlock_bh(&br->multicast_lock);
 946         del_timer_sync(&port->multicast_router_timer);
 947 }
 948
 949 static void br_multicast_enable(struct bridge_mcast_own_query *query)
 950 {
 951         query->startup_sent = 0;
 952
 953         if (try_to_del_timer_sync(&query->timer) >= 0 ||
 954             del_timer(&query->timer))
 955                 mod_timer(&query->timer, jiffies);
 956 }
 957
 958 void br_multicast_enable_port(struct net_bridge_port *port)
 959 {
 960         struct net_bridge *br = port->br;
 961
 962         spin_lock(&br->multicast_lock);
 963         if (br->multicast_disabled || !netif_running(br->dev))
 964                 goto out;
 965
 966         br_multicast_enable(&port->ip4_own_query);
 967 #if IS_ENABLED(CONFIG_IPV6)
 968         br_multicast_enable(&port->ip6_own_query);
 969 #endif
 970         if (port->multicast_router == MDB_RTR_TYPE_PERM &&
 971             hlist_unhashed(&port->rlist))
 972                 br_multicast_add_router(br, port);
 973
 974 out:
 975         spin_unlock(&br->multicast_lock);
 976 }
 977
 978 void br_multicast_disable_port(struct net_bridge_port *port)
 979 {
 980         struct net_bridge *br = port->br;
 981         struct net_bridge_port_group *pg;
 982         struct hlist_node *n;
 983
 984         spin_lock(&br->multicast_lock);
 985         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 986                 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
 987                         br_multicast_del_pg(br, pg);
 988
 989         if (!hlist_unhashed(&port->rlist)) {
 990                 hlist_del_init_rcu(&port->rlist);
 991                 br_rtr_notify(br->dev, port, RTM_DELMDB);
 992                 /* Don't allow timer refresh if disabling */
 993                 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
 994                         port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
 995         }
 996         del_timer(&port->multicast_router_timer);
 997         del_timer(&port->ip4_own_query.timer);
 998 #if IS_ENABLED(CONFIG_IPV6)
 999         del_timer(&port->ip6_own_query.timer);
1000 #endif
1001         spin_unlock(&br->multicast_lock);
1002 }
1003
1004 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1005                                          struct net_bridge_port *port,
1006                                          struct sk_buff *skb,
1007                                          u16 vid)
1008 {
1009         struct igmpv3_report *ih;
1010         struct igmpv3_grec *grec;
1011         int i;
1012         int len;
1013         int num;
1014         int type;
1015         int err = 0;
1016         __be32 group;
1017
1018         ih = igmpv3_report_hdr(skb);
1019         num = ntohs(ih->ngrec);
1020         len = skb_transport_offset(skb) + sizeof(*ih);
1021
1022         for (i = 0; i < num; i++) {
1023                 len += sizeof(*grec);
1024                 if (!pskb_may_pull(skb, len))
1025                         return -EINVAL;
1026
1027                 grec = (void *)(skb->data + len - sizeof(*grec));
1028                 group = grec->grec_mca;
1029                 type = grec->grec_type;
1030
1031                 len += ntohs(grec->grec_nsrcs) * 4;
1032                 if (!pskb_may_pull(skb, len))
1033                         return -EINVAL;
1034
1035                 /* We treat this as an IGMPv2 report for now. */
1036                 switch (type) {
1037                 case IGMPV3_MODE_IS_INCLUDE:
1038                 case IGMPV3_MODE_IS_EXCLUDE:
1039                 case IGMPV3_CHANGE_TO_INCLUDE:
1040                 case IGMPV3_CHANGE_TO_EXCLUDE:
1041                 case IGMPV3_ALLOW_NEW_SOURCES:
1042                 case IGMPV3_BLOCK_OLD_SOURCES:
1043                         break;
1044
1045                 default:
1046                         continue;
1047                 }
1048
1049                 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1050                      type == IGMPV3_MODE_IS_INCLUDE) &&
1051                     ntohs(grec->grec_nsrcs) == 0) {
1052                         br_ip4_multicast_leave_group(br, port, group, vid);
1053                 } else {
1054                         err = br_ip4_multicast_add_group(br, port, group, vid);
1055                         if (err)
1056                                 break;
1057                 }
1058         }
1059
1060         return err;
1061 }
1062
1063 #if IS_ENABLED(CONFIG_IPV6)
1064 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1065                                         struct net_bridge_port *port,
1066                                         struct sk_buff *skb,
1067                                         u16 vid)
1068 {
1069         struct icmp6hdr *icmp6h;
1070         struct mld2_grec *grec;
1071         int i;
1072         int len;
1073         int num;
1074         int err = 0;
1075
1076         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1077                 return -EINVAL;
1078
1079         icmp6h = icmp6_hdr(skb);
1080         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1081         len = skb_transport_offset(skb) + sizeof(*icmp6h);
1082
1083         for (i = 0; i < num; i++) {
1084                 __be16 *nsrcs, _nsrcs;
1085
1086                 nsrcs = skb_header_pointer(skb,
1087                                            len + offsetof(struct mld2_grec,
1088                                                           grec_nsrcs),
1089                                            sizeof(_nsrcs), &_nsrcs);
1090                 if (!nsrcs)
1091                         return -EINVAL;
1092
1093                 if (!pskb_may_pull(skb,
1094                                    len + sizeof(*grec) +
1095                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
1096                         return -EINVAL;
1097
1098                 grec = (struct mld2_grec *)(skb->data + len);
1099                 len += sizeof(*grec) +
1100                        sizeof(struct in6_addr) * ntohs(*nsrcs);
1101
1102                 /* We treat these as MLDv1 reports for now. */
1103                 switch (grec->grec_type) {
1104                 case MLD2_MODE_IS_INCLUDE:
1105                 case MLD2_MODE_IS_EXCLUDE:
1106                 case MLD2_CHANGE_TO_INCLUDE:
1107                 case MLD2_CHANGE_TO_EXCLUDE:
1108                 case MLD2_ALLOW_NEW_SOURCES:
1109                 case MLD2_BLOCK_OLD_SOURCES:
1110                         break;
1111
1112                 default:
1113                         continue;
1114                 }
1115
1116                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1117                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1118                     ntohs(*nsrcs) == 0) {
1119                         br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1120                                                      vid);
1121                 } else {
1122                         err = br_ip6_multicast_add_group(br, port,
1123                                                          &grec->grec_mca, vid);
1124                         if (!err)
1125                                 break;
1126                 }
1127         }
1128
1129         return err;
1130 }
1131 #endif
1132
1133 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1134                                             struct net_bridge_port *port,
1135                                             __be32 saddr)
1136 {
1137         if (!timer_pending(&br->ip4_own_query.timer) &&
1138             !timer_pending(&br->ip4_other_query.timer))
1139                 goto update;
1140
1141         if (!br->ip4_querier.addr.u.ip4)
1142                 goto update;
1143
1144         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1145                 goto update;
1146
1147         return false;
1148
1149 update:
1150         br->ip4_querier.addr.u.ip4 = saddr;
1151
1152         /* update protected by general multicast_lock by caller */
1153         rcu_assign_pointer(br->ip4_querier.port, port);
1154
1155         return true;
1156 }
1157
1158 #if IS_ENABLED(CONFIG_IPV6)
1159 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1160                                             struct net_bridge_port *port,
1161                                             struct in6_addr *saddr)
1162 {
1163         if (!timer_pending(&br->ip6_own_query.timer) &&
1164             !timer_pending(&br->ip6_other_query.timer))
1165                 goto update;
1166
1167         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1168                 goto update;
1169
1170         return false;
1171
1172 update:
1173         br->ip6_querier.addr.u.ip6 = *saddr;
1174
1175         /* update protected by general multicast_lock by caller */
1176         rcu_assign_pointer(br->ip6_querier.port, port);
1177
1178         return true;
1179 }
1180 #endif
1181
1182 static bool br_multicast_select_querier(struct net_bridge *br,
1183                                         struct net_bridge_port *port,
1184                                         struct br_ip *saddr)
1185 {
1186         switch (saddr->proto) {
1187         case htons(ETH_P_IP):
1188                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1189 #if IS_ENABLED(CONFIG_IPV6)
1190         case htons(ETH_P_IPV6):
1191                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1192 #endif
1193         }
1194
1195         return false;
1196 }
1197
1198 static void
1199 br_multicast_update_query_timer(struct net_bridge *br,
1200                                 struct bridge_mcast_other_query *query,
1201                                 unsigned long max_delay)
1202 {
1203         if (!timer_pending(&query->timer))
1204                 query->delay_time = jiffies + max_delay;
1205
1206         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1207 }
1208
1209 /*
1210  * Add port to router_list
1211  *  list is maintained ordered by pointer value
1212  *  and locked by br->multicast_lock and RCU
1213  */
1214 static void br_multicast_add_router(struct net_bridge *br,
1215                                     struct net_bridge_port *port)
1216 {
1217         struct net_bridge_port *p;
1218         struct hlist_node *slot = NULL;
1219
1220         if (!hlist_unhashed(&port->rlist))
1221                 return;
1222
1223         hlist_for_each_entry(p, &br->router_list, rlist) {
1224                 if ((unsigned long) port >= (unsigned long) p)
1225                         break;
1226                 slot = &p->rlist;
1227         }
1228
1229         if (slot)
1230                 hlist_add_behind_rcu(&port->rlist, slot);
1231         else
1232                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1233         br_rtr_notify(br->dev, port, RTM_NEWMDB);
1234 }
1235
1236 static void br_multicast_mark_router(struct net_bridge *br,
1237                                      struct net_bridge_port *port)
1238 {
1239         unsigned long now = jiffies;
1240
1241         if (!port) {
1242                 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1243                         mod_timer(&br->multicast_router_timer,
1244                                   now + br->multicast_querier_interval);
1245                 return;
1246         }
1247
1248         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1249             port->multicast_router == MDB_RTR_TYPE_PERM)
1250                 return;
1251
1252         br_multicast_add_router(br, port);
1253
1254         mod_timer(&port->multicast_router_timer,
1255                   now + br->multicast_querier_interval);
1256 }
1257
1258 static void br_multicast_query_received(struct net_bridge *br,
1259                                         struct net_bridge_port *port,
1260                                         struct bridge_mcast_other_query *query,
1261                                         struct br_ip *saddr,
1262                                         unsigned long max_delay)
1263 {
1264         if (!br_multicast_select_querier(br, port, saddr))
1265                 return;
1266
1267         br_multicast_update_query_timer(br, query, max_delay);
1268         br_multicast_mark_router(br, port);
1269 }
1270
1271 static int br_ip4_multicast_query(struct net_bridge *br,
1272                                   struct net_bridge_port *port,
1273                                   struct sk_buff *skb,
1274                                   u16 vid)
1275 {
1276         const struct iphdr *iph = ip_hdr(skb);
1277         struct igmphdr *ih = igmp_hdr(skb);
1278         struct net_bridge_mdb_entry *mp;
1279         struct igmpv3_query *ih3;
1280         struct net_bridge_port_group *p;
1281         struct net_bridge_port_group __rcu **pp;
1282         struct br_ip saddr;
1283         unsigned long max_delay;
1284         unsigned long now = jiffies;
1285         unsigned int offset = skb_transport_offset(skb);
1286         __be32 group;
1287         int err = 0;
1288
1289         spin_lock(&br->multicast_lock);
1290         if (!netif_running(br->dev) ||
1291             (port && port->state == BR_STATE_DISABLED))
1292                 goto out;
1293
1294         group = ih->group;
1295
1296         if (skb->len == offset + sizeof(*ih)) {
1297                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1298
1299                 if (!max_delay) {
1300                         max_delay = 10 * HZ;
1301                         group = 0;
1302                 }
1303         } else if (skb->len >= offset + sizeof(*ih3)) {
1304                 ih3 = igmpv3_query_hdr(skb);
1305                 if (ih3->nsrcs)
1306                         goto out;
1307
1308                 max_delay = ih3->code ?
1309                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1310         } else {
1311                 goto out;
1312         }
1313
1314         if (!group) {
1315                 saddr.proto = htons(ETH_P_IP);
1316                 saddr.u.ip4 = iph->saddr;
1317
1318                 br_multicast_query_received(br, port, &br->ip4_other_query,
1319                                             &saddr, max_delay);
1320                 goto out;
1321         }
1322
1323         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1324         if (!mp)
1325                 goto out;
1326
1327         max_delay *= br->multicast_last_member_count;
1328
1329         if (mp->mglist &&
1330             (timer_pending(&mp->timer) ?
1331              time_after(mp->timer.expires, now + max_delay) :
1332              try_to_del_timer_sync(&mp->timer) >= 0))
1333                 mod_timer(&mp->timer, now + max_delay);
1334
1335         for (pp = &mp->ports;
1336              (p = mlock_dereference(*pp, br)) != NULL;
1337              pp = &p->next) {
1338                 if (timer_pending(&p->timer) ?
1339                     time_after(p->timer.expires, now + max_delay) :
1340                     try_to_del_timer_sync(&p->timer) >= 0)
1341                         mod_timer(&p->timer, now + max_delay);
1342         }
1343
1344 out:
1345         spin_unlock(&br->multicast_lock);
1346         return err;
1347 }
1348
1349 #if IS_ENABLED(CONFIG_IPV6)
1350 static int br_ip6_multicast_query(struct net_bridge *br,
1351                                   struct net_bridge_port *port,
1352                                   struct sk_buff *skb,
1353                                   u16 vid)
1354 {
1355         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1356         struct mld_msg *mld;
1357         struct net_bridge_mdb_entry *mp;
1358         struct mld2_query *mld2q;
1359         struct net_bridge_port_group *p;
1360         struct net_bridge_port_group __rcu **pp;
1361         struct br_ip saddr;
1362         unsigned long max_delay;
1363         unsigned long now = jiffies;
1364         unsigned int offset = skb_transport_offset(skb);
1365         const struct in6_addr *group = NULL;
1366         bool is_general_query;
1367         int err = 0;
1368
1369         spin_lock(&br->multicast_lock);
1370         if (!netif_running(br->dev) ||
1371             (port && port->state == BR_STATE_DISABLED))
1372                 goto out;
1373
1374         if (skb->len == offset + sizeof(*mld)) {
1375                 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1376                         err = -EINVAL;
1377                         goto out;
1378                 }
1379                 mld = (struct mld_msg *) icmp6_hdr(skb);
1380                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1381                 if (max_delay)
1382                         group = &mld->mld_mca;
1383         } else {
1384                 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1385                         err = -EINVAL;
1386                         goto out;
1387                 }
1388                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1389                 if (!mld2q->mld2q_nsrcs)
1390                         group = &mld2q->mld2q_mca;
1391
1392                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1393         }
1394
1395         is_general_query = group && ipv6_addr_any(group);
1396
1397         if (is_general_query) {
1398                 saddr.proto = htons(ETH_P_IPV6);
1399                 saddr.u.ip6 = ip6h->saddr;
1400
1401                 br_multicast_query_received(br, port, &br->ip6_other_query,
1402                                             &saddr, max_delay);
1403                 goto out;
1404         } else if (!group) {
1405                 goto out;
1406         }
1407
1408         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1409         if (!mp)
1410                 goto out;
1411
1412         max_delay *= br->multicast_last_member_count;
1413         if (mp->mglist &&
1414             (timer_pending(&mp->timer) ?
1415              time_after(mp->timer.expires, now + max_delay) :
1416              try_to_del_timer_sync(&mp->timer) >= 0))
1417                 mod_timer(&mp->timer, now + max_delay);
1418
1419         for (pp = &mp->ports;
1420              (p = mlock_dereference(*pp, br)) != NULL;
1421              pp = &p->next) {
1422                 if (timer_pending(&p->timer) ?
1423                     time_after(p->timer.expires, now + max_delay) :
1424                     try_to_del_timer_sync(&p->timer) >= 0)
1425                         mod_timer(&p->timer, now + max_delay);
1426         }
1427
1428 out:
1429         spin_unlock(&br->multicast_lock);
1430         return err;
1431 }
1432 #endif
1433
1434 static void
1435 br_multicast_leave_group(struct net_bridge *br,
1436                          struct net_bridge_port *port,
1437                          struct br_ip *group,
1438                          struct bridge_mcast_other_query *other_query,
1439                          struct bridge_mcast_own_query *own_query)
1440 {
1441         struct net_bridge_mdb_htable *mdb;
1442         struct net_bridge_mdb_entry *mp;
1443         struct net_bridge_port_group *p;
1444         unsigned long now;
1445         unsigned long time;
1446
1447         spin_lock(&br->multicast_lock);
1448         if (!netif_running(br->dev) ||
1449             (port && port->state == BR_STATE_DISABLED))
1450                 goto out;
1451
1452         mdb = mlock_dereference(br->mdb, br);
1453         mp = br_mdb_ip_get(mdb, group);
1454         if (!mp)
1455                 goto out;
1456
1457         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1458                 struct net_bridge_port_group __rcu **pp;
1459
1460                 for (pp = &mp->ports;
1461                      (p = mlock_dereference(*pp, br)) != NULL;
1462                      pp = &p->next) {
1463                         if (p->port != port)
1464                                 continue;
1465
1466                         rcu_assign_pointer(*pp, p->next);
1467                         hlist_del_init(&p->mglist);
1468                         del_timer(&p->timer);
1469                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1470                         br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1471                                       p->flags);
1472
1473                         if (!mp->ports && !mp->mglist &&
1474                             netif_running(br->dev))
1475                                 mod_timer(&mp->timer, jiffies);
1476                 }
1477                 goto out;
1478         }
1479
1480         if (timer_pending(&other_query->timer))
1481                 goto out;
1482
1483         if (br->multicast_querier) {
1484                 __br_multicast_send_query(br, port, &mp->addr);
1485
1486                 time = jiffies + br->multicast_last_member_count *
1487                                  br->multicast_last_member_interval;
1488
1489                 mod_timer(&own_query->timer, time);
1490
1491                 for (p = mlock_dereference(mp->ports, br);
1492                      p != NULL;
1493                      p = mlock_dereference(p->next, br)) {
1494                         if (p->port != port)
1495                                 continue;
1496
1497                         if (!hlist_unhashed(&p->mglist) &&
1498                             (timer_pending(&p->timer) ?
1499                              time_after(p->timer.expires, time) :
1500                              try_to_del_timer_sync(&p->timer) >= 0)) {
1501                                 mod_timer(&p->timer, time);
1502                         }
1503
1504                         break;
1505                 }
1506         }
1507
1508         now = jiffies;
1509         time = now + br->multicast_last_member_count *
1510                      br->multicast_last_member_interval;
1511
1512         if (!port) {
1513                 if (mp->mglist &&
1514                     (timer_pending(&mp->timer) ?
1515                      time_after(mp->timer.expires, time) :
1516                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1517                         mod_timer(&mp->timer, time);
1518                 }
1519
1520                 goto out;
1521         }
1522
1523         for (p = mlock_dereference(mp->ports, br);
1524              p != NULL;
1525              p = mlock_dereference(p->next, br)) {
1526                 if (p->port != port)
1527                         continue;
1528
1529                 if (!hlist_unhashed(&p->mglist) &&
1530                     (timer_pending(&p->timer) ?
1531                      time_after(p->timer.expires, time) :
1532                      try_to_del_timer_sync(&p->timer) >= 0)) {
1533                         mod_timer(&p->timer, time);
1534                 }
1535
1536                 break;
1537         }
1538 out:
1539         spin_unlock(&br->multicast_lock);
1540 }
1541
1542 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1543                                          struct net_bridge_port *port,
1544                                          __be32 group,
1545                                          __u16 vid)
1546 {
1547         struct br_ip br_group;
1548         struct bridge_mcast_own_query *own_query;
1549
1550         if (ipv4_is_local_multicast(group))
1551                 return;
1552
1553         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1554
1555         br_group.u.ip4 = group;
1556         br_group.proto = htons(ETH_P_IP);
1557         br_group.vid = vid;
1558
1559         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1560                                  own_query);
1561 }
1562
1563 #if IS_ENABLED(CONFIG_IPV6)
1564 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1565                                          struct net_bridge_port *port,
1566                                          const struct in6_addr *group,
1567                                          __u16 vid)
1568 {
1569         struct br_ip br_group;
1570         struct bridge_mcast_own_query *own_query;
1571
1572         if (ipv6_addr_is_ll_all_nodes(group))
1573                 return;
1574
1575         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1576
1577         br_group.u.ip6 = *group;
1578         br_group.proto = htons(ETH_P_IPV6);
1579         br_group.vid = vid;
1580
1581         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1582                                  own_query);
1583 }
1584 #endif
1585
1586 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1587                                  struct net_bridge_port *port,
1588                                  struct sk_buff *skb,
1589                                  u16 vid)
1590 {
1591         struct sk_buff *skb_trimmed = NULL;
1592         struct igmphdr *ih;
1593         int err;
1594
1595         err = ip_mc_check_igmp(skb, &skb_trimmed);
1596
1597         if (err == -ENOMSG) {
1598                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1599                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1600                 return 0;
1601         } else if (err < 0) {
1602                 return err;
1603         }
1604
1605         BR_INPUT_SKB_CB(skb)->igmp = 1;
1606         ih = igmp_hdr(skb);
1607
1608         switch (ih->type) {
1609         case IGMP_HOST_MEMBERSHIP_REPORT:
1610         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1611                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1612                 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1613                 break;
1614         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1615                 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1616                 break;
1617         case IGMP_HOST_MEMBERSHIP_QUERY:
1618                 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1619                 break;
1620         case IGMP_HOST_LEAVE_MESSAGE:
1621                 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1622                 break;
1623         }
1624
1625         if (skb_trimmed && skb_trimmed != skb)
1626                 kfree_skb(skb_trimmed);
1627
1628         return err;
1629 }
1630
1631 #if IS_ENABLED(CONFIG_IPV6)
1632 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1633                                  struct net_bridge_port *port,
1634                                  struct sk_buff *skb,
1635                                  u16 vid)
1636 {
1637         struct sk_buff *skb_trimmed = NULL;
1638         struct mld_msg *mld;
1639         int err;
1640
1641         err = ipv6_mc_check_mld(skb, &skb_trimmed);
1642
1643         if (err == -ENOMSG) {
1644                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1645                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1646                 return 0;
1647         } else if (err < 0) {
1648                 return err;
1649         }
1650
1651         BR_INPUT_SKB_CB(skb)->igmp = 1;
1652         mld = (struct mld_msg *)skb_transport_header(skb);
1653
1654         switch (mld->mld_type) {
1655         case ICMPV6_MGM_REPORT:
1656                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1657                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1658                 break;
1659         case ICMPV6_MLD2_REPORT:
1660                 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1661                 break;
1662         case ICMPV6_MGM_QUERY:
1663                 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1664                 break;
1665         case ICMPV6_MGM_REDUCTION:
1666                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1667                 break;
1668         }
1669
1670         if (skb_trimmed && skb_trimmed != skb)
1671                 kfree_skb(skb_trimmed);
1672
1673         return err;
1674 }
1675 #endif
1676
1677 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1678                      struct sk_buff *skb, u16 vid)
1679 {
1680         BR_INPUT_SKB_CB(skb)->igmp = 0;
1681         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1682
1683         if (br->multicast_disabled)
1684                 return 0;
1685
1686         switch (skb->protocol) {
1687         case htons(ETH_P_IP):
1688                 return br_multicast_ipv4_rcv(br, port, skb, vid);
1689 #if IS_ENABLED(CONFIG_IPV6)
1690         case htons(ETH_P_IPV6):
1691                 return br_multicast_ipv6_rcv(br, port, skb, vid);
1692 #endif
1693         }
1694
1695         return 0;
1696 }
1697
1698 static void br_multicast_query_expired(struct net_bridge *br,
1699                                        struct bridge_mcast_own_query *query,
1700                                        struct bridge_mcast_querier *querier)
1701 {
1702         spin_lock(&br->multicast_lock);
1703         if (query->startup_sent < br->multicast_startup_query_count)
1704                 query->startup_sent++;
1705
1706         RCU_INIT_POINTER(querier->port, NULL);
1707         br_multicast_send_query(br, NULL, query);
1708         spin_unlock(&br->multicast_lock);
1709 }
1710
1711 static void br_ip4_multicast_query_expired(unsigned long data)
1712 {
1713         struct net_bridge *br = (void *)data;
1714
1715         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1716 }
1717
1718 #if IS_ENABLED(CONFIG_IPV6)
1719 static void br_ip6_multicast_query_expired(unsigned long data)
1720 {
1721         struct net_bridge *br = (void *)data;
1722
1723         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1724 }
1725 #endif
1726
1727 void br_multicast_init(struct net_bridge *br)
1728 {
1729         br->hash_elasticity = 4;
1730         br->hash_max = 512;
1731
1732         br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1733         br->multicast_querier = 0;
1734         br->multicast_query_use_ifaddr = 0;
1735         br->multicast_last_member_count = 2;
1736         br->multicast_startup_query_count = 2;
1737
1738         br->multicast_last_member_interval = HZ;
1739         br->multicast_query_response_interval = 10 * HZ;
1740         br->multicast_startup_query_interval = 125 * HZ / 4;
1741         br->multicast_query_interval = 125 * HZ;
1742         br->multicast_querier_interval = 255 * HZ;
1743         br->multicast_membership_interval = 260 * HZ;
1744
1745         br->ip4_other_query.delay_time = 0;
1746         br->ip4_querier.port = NULL;
1747 #if IS_ENABLED(CONFIG_IPV6)
1748         br->ip6_other_query.delay_time = 0;
1749         br->ip6_querier.port = NULL;
1750 #endif
1751         br->has_ipv6_addr = 1;
1752
1753         spin_lock_init(&br->multicast_lock);
1754         setup_timer(&br->multicast_router_timer,
1755                     br_multicast_local_router_expired, 0);
1756         setup_timer(&br->ip4_other_query.timer,
1757                     br_ip4_multicast_querier_expired, (unsigned long)br);
1758         setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1759                     (unsigned long)br);
1760 #if IS_ENABLED(CONFIG_IPV6)
1761         setup_timer(&br->ip6_other_query.timer,
1762                     br_ip6_multicast_querier_expired, (unsigned long)br);
1763         setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1764                     (unsigned long)br);
1765 #endif
1766 }
1767
1768 static void __br_multicast_open(struct net_bridge *br,
1769                                 struct bridge_mcast_own_query *query)
1770 {
1771         query->startup_sent = 0;
1772
1773         if (br->multicast_disabled)
1774                 return;
1775
1776         mod_timer(&query->timer, jiffies);
1777 }
1778
1779 void br_multicast_open(struct net_bridge *br)
1780 {
1781         __br_multicast_open(br, &br->ip4_own_query);
1782 #if IS_ENABLED(CONFIG_IPV6)
1783         __br_multicast_open(br, &br->ip6_own_query);
1784 #endif
1785 }
1786
1787 void br_multicast_stop(struct net_bridge *br)
1788 {
1789         del_timer_sync(&br->multicast_router_timer);
1790         del_timer_sync(&br->ip4_other_query.timer);
1791         del_timer_sync(&br->ip4_own_query.timer);
1792 #if IS_ENABLED(CONFIG_IPV6)
1793         del_timer_sync(&br->ip6_other_query.timer);
1794         del_timer_sync(&br->ip6_own_query.timer);
1795 #endif
1796 }
1797
1798 void br_multicast_dev_del(struct net_bridge *br)
1799 {
1800         struct net_bridge_mdb_htable *mdb;
1801         struct net_bridge_mdb_entry *mp;
1802         struct hlist_node *n;
1803         u32 ver;
1804         int i;
1805
1806         spin_lock_bh(&br->multicast_lock);
1807         mdb = mlock_dereference(br->mdb, br);
1808         if (!mdb)
1809                 goto out;
1810
1811         br->mdb = NULL;
1812
1813         ver = mdb->ver;
1814         for (i = 0; i < mdb->max; i++) {
1815                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1816                                           hlist[ver]) {
1817                         del_timer(&mp->timer);
1818                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
1819                 }
1820         }
1821
1822         if (mdb->old) {
1823                 spin_unlock_bh(&br->multicast_lock);
1824                 rcu_barrier_bh();
1825                 spin_lock_bh(&br->multicast_lock);
1826                 WARN_ON(mdb->old);
1827         }
1828
1829         mdb->old = mdb;
1830         call_rcu_bh(&mdb->rcu, br_mdb_free);
1831
1832 out:
1833         spin_unlock_bh(&br->multicast_lock);
1834 }
1835
1836 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1837 {
1838         int err = -EINVAL;
1839
1840         spin_lock_bh(&br->multicast_lock);
1841
1842         switch (val) {
1843         case MDB_RTR_TYPE_DISABLED:
1844         case MDB_RTR_TYPE_PERM:
1845                 del_timer(&br->multicast_router_timer);
1846                 /* fall through */
1847         case MDB_RTR_TYPE_TEMP_QUERY:
1848                 br->multicast_router = val;
1849                 err = 0;
1850                 break;
1851         }
1852
1853         spin_unlock_bh(&br->multicast_lock);
1854
1855         return err;
1856 }
1857
1858 static void __del_port_router(struct net_bridge_port *p)
1859 {
1860         if (hlist_unhashed(&p->rlist))
1861                 return;
1862         hlist_del_init_rcu(&p->rlist);
1863         br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1864 }
1865
1866 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1867 {
1868         struct net_bridge *br = p->br;
1869         unsigned long now = jiffies;
1870         int err = -EINVAL;
1871
1872         spin_lock(&br->multicast_lock);
1873         if (p->multicast_router == val) {
1874                 /* Refresh the temp router port timer */
1875                 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1876                         mod_timer(&p->multicast_router_timer,
1877                                   now + br->multicast_querier_interval);
1878                 err = 0;
1879                 goto unlock;
1880         }
1881         switch (val) {
1882         case MDB_RTR_TYPE_DISABLED:
1883                 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1884                 __del_port_router(p);
1885                 del_timer(&p->multicast_router_timer);
1886                 break;
1887         case MDB_RTR_TYPE_TEMP_QUERY:
1888                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1889                 __del_port_router(p);
1890                 break;
1891         case MDB_RTR_TYPE_PERM:
1892                 p->multicast_router = MDB_RTR_TYPE_PERM;
1893                 del_timer(&p->multicast_router_timer);
1894                 br_multicast_add_router(br, p);
1895                 break;
1896         case MDB_RTR_TYPE_TEMP:
1897                 p->multicast_router = MDB_RTR_TYPE_TEMP;
1898                 br_multicast_mark_router(br, p);
1899                 break;
1900         default:
1901                 goto unlock;
1902         }
1903         err = 0;
1904 unlock:
1905         spin_unlock(&br->multicast_lock);
1906
1907         return err;
1908 }
1909
1910 static void br_multicast_start_querier(struct net_bridge *br,
1911                                        struct bridge_mcast_own_query *query)
1912 {
1913         struct net_bridge_port *port;
1914
1915         __br_multicast_open(br, query);
1916
1917         list_for_each_entry(port, &br->port_list, list) {
1918                 if (port->state == BR_STATE_DISABLED ||
1919                     port->state == BR_STATE_BLOCKING)
1920                         continue;
1921
1922                 if (query == &br->ip4_own_query)
1923                         br_multicast_enable(&port->ip4_own_query);
1924 #if IS_ENABLED(CONFIG_IPV6)
1925                 else
1926                         br_multicast_enable(&port->ip6_own_query);
1927 #endif
1928         }
1929 }
1930
1931 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1932 {
1933         int err = 0;
1934         struct net_bridge_mdb_htable *mdb;
1935
1936         spin_lock_bh(&br->multicast_lock);
1937         if (br->multicast_disabled == !val)
1938                 goto unlock;
1939
1940         br->multicast_disabled = !val;
1941         if (br->multicast_disabled)
1942                 goto unlock;
1943
1944         if (!netif_running(br->dev))
1945                 goto unlock;
1946
1947         mdb = mlock_dereference(br->mdb, br);
1948         if (mdb) {
1949                 if (mdb->old) {
1950                         err = -EEXIST;
1951 rollback:
1952                         br->multicast_disabled = !!val;
1953                         goto unlock;
1954                 }
1955
1956                 err = br_mdb_rehash(&br->mdb, mdb->max,
1957                                     br->hash_elasticity);
1958                 if (err)
1959                         goto rollback;
1960         }
1961
1962         br_multicast_start_querier(br, &br->ip4_own_query);
1963 #if IS_ENABLED(CONFIG_IPV6)
1964         br_multicast_start_querier(br, &br->ip6_own_query);
1965 #endif
1966
1967 unlock:
1968         spin_unlock_bh(&br->multicast_lock);
1969
1970         return err;
1971 }
1972
1973 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1974 {
1975         unsigned long max_delay;
1976
1977         val = !!val;
1978
1979         spin_lock_bh(&br->multicast_lock);
1980         if (br->multicast_querier == val)
1981                 goto unlock;
1982
1983         br->multicast_querier = val;
1984         if (!val)
1985                 goto unlock;
1986
1987         max_delay = br->multicast_query_response_interval;
1988
1989         if (!timer_pending(&br->ip4_other_query.timer))
1990                 br->ip4_other_query.delay_time = jiffies + max_delay;
1991
1992         br_multicast_start_querier(br, &br->ip4_own_query);
1993
1994 #if IS_ENABLED(CONFIG_IPV6)
1995         if (!timer_pending(&br->ip6_other_query.timer))
1996                 br->ip6_other_query.delay_time = jiffies + max_delay;
1997
1998         br_multicast_start_querier(br, &br->ip6_own_query);
1999 #endif
2000
2001 unlock:
2002         spin_unlock_bh(&br->multicast_lock);
2003
2004         return 0;
2005 }
2006
2007 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2008 {
2009         int err = -EINVAL;
2010         u32 old;
2011         struct net_bridge_mdb_htable *mdb;
2012
2013         spin_lock_bh(&br->multicast_lock);
2014         if (!is_power_of_2(val))
2015                 goto unlock;
2016
2017         mdb = mlock_dereference(br->mdb, br);
2018         if (mdb && val < mdb->size)
2019                 goto unlock;
2020
2021         err = 0;
2022
2023         old = br->hash_max;
2024         br->hash_max = val;
2025
2026         if (mdb) {
2027                 if (mdb->old) {
2028                         err = -EEXIST;
2029 rollback:
2030                         br->hash_max = old;
2031                         goto unlock;
2032                 }
2033
2034                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2035                                     br->hash_elasticity);
2036                 if (err)
2037                         goto rollback;
2038         }
2039
2040 unlock:
2041         spin_unlock_bh(&br->multicast_lock);
2042
2043         return err;
2044 }
2045
2046 /**
2047  * br_multicast_list_adjacent - Returns snooped multicast addresses
2048  * @dev:        The bridge port adjacent to which to retrieve addresses
2049  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2050  *
2051  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2052  * snooping feature on all bridge ports of dev's bridge device, excluding
2053  * the addresses from dev itself.
2054  *
2055  * Returns the number of items added to br_ip_list.
2056  *
2057  * Notes:
2058  * - br_ip_list needs to be initialized by caller
2059  * - br_ip_list might contain duplicates in the end
2060  *   (needs to be taken care of by caller)
2061  * - br_ip_list needs to be freed by caller
2062  */
2063 int br_multicast_list_adjacent(struct net_device *dev,
2064                                struct list_head *br_ip_list)
2065 {
2066         struct net_bridge *br;
2067         struct net_bridge_port *port;
2068         struct net_bridge_port_group *group;
2069         struct br_ip_list *entry;
2070         int count = 0;
2071
2072         rcu_read_lock();
2073         if (!br_ip_list || !br_port_exists(dev))
2074                 goto unlock;
2075
2076         port = br_port_get_rcu(dev);
2077         if (!port || !port->br)
2078                 goto unlock;
2079
2080         br = port->br;
2081
2082         list_for_each_entry_rcu(port, &br->port_list, list) {
2083                 if (!port->dev || port->dev == dev)
2084                         continue;
2085
2086                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2087                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2088                         if (!entry)
2089                                 goto unlock;
2090
2091                         entry->addr = group->addr;
2092                         list_add(&entry->list, br_ip_list);
2093                         count++;
2094                 }
2095         }
2096
2097 unlock:
2098         rcu_read_unlock();
2099         return count;
2100 }
2101 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2102
2103 /**
2104  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2105  * @dev: The bridge port providing the bridge on which to check for a querier
2106  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2107  *
2108  * Checks whether the given interface has a bridge on top and if so returns
2109  * true if a valid querier exists anywhere on the bridged link layer.
2110  * Otherwise returns false.
2111  */
2112 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2113 {
2114         struct net_bridge *br;
2115         struct net_bridge_port *port;
2116         struct ethhdr eth;
2117         bool ret = false;
2118
2119         rcu_read_lock();
2120         if (!br_port_exists(dev))
2121                 goto unlock;
2122
2123         port = br_port_get_rcu(dev);
2124         if (!port || !port->br)
2125                 goto unlock;
2126
2127         br = port->br;
2128
2129         memset(&eth, 0, sizeof(eth));
2130         eth.h_proto = htons(proto);
2131
2132         ret = br_multicast_querier_exists(br, &eth);
2133
2134 unlock:
2135         rcu_read_unlock();
2136         return ret;
2137 }
2138 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2139
2140 /**
2141  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2142  * @dev: The bridge port adjacent to which to check for a querier
2143  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2144  *
2145  * Checks whether the given interface has a bridge on top and if so returns
2146  * true if a selected querier is behind one of the other ports of this
2147  * bridge. Otherwise returns false.
2148  */
2149 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2150 {
2151         struct net_bridge *br;
2152         struct net_bridge_port *port;
2153         bool ret = false;
2154
2155         rcu_read_lock();
2156         if (!br_port_exists(dev))
2157                 goto unlock;
2158
2159         port = br_port_get_rcu(dev);
2160         if (!port || !port->br)
2161                 goto unlock;
2162
2163         br = port->br;
2164
2165         switch (proto) {
2166         case ETH_P_IP:
2167                 if (!timer_pending(&br->ip4_other_query.timer) ||
2168                     rcu_dereference(br->ip4_querier.port) == port)
2169                         goto unlock;
2170                 break;
2171 #if IS_ENABLED(CONFIG_IPV6)
2172         case ETH_P_IPV6:
2173                 if (!timer_pending(&br->ip6_other_query.timer) ||
2174                     rcu_dereference(br->ip6_querier.port) == port)
2175                         goto unlock;
2176                 break;
2177 #endif
2178         default:
2179                 goto unlock;
2180         }
2181
2182         ret = true;
2183 unlock:
2184         rcu_read_unlock();
2185         return ret;
2186 }
2187 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);