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 <linux/mroute.h>
  29 #include <net/ip.h>
  30 #include <net/switchdev.h>
  31 #if IS_ENABLED(CONFIG_IPV6)
  32 #include <net/ipv6.h>
  33 #include <net/mld.h>
  34 #include <net/ip6_checksum.h>
  35 #include <net/addrconf.h>
  36 #endif
  37
  38 #include "br_private.h"
  39
  40 static void br_multicast_start_querier(struct net_bridge *br,
  41                                        struct bridge_mcast_own_query *query);
  42 static void br_multicast_add_router(struct net_bridge *br,
  43                                     struct net_bridge_port *port);
  44 static void br_ip4_multicast_leave_group(struct net_bridge *br,
  45                                          struct net_bridge_port *port,
  46                                          __be32 group,
  47                                          __u16 vid,
  48                                          const unsigned char *src);
  49
  50 static void __del_port_router(struct net_bridge_port *p);
  51 #if IS_ENABLED(CONFIG_IPV6)
  52 static void br_ip6_multicast_leave_group(struct net_bridge *br,
  53                                          struct net_bridge_port *port,
  54                                          const struct in6_addr *group,
  55                                          __u16 vid, const unsigned char *src);
  56 #endif
  57 unsigned int br_mdb_rehash_seq;
  58
  59 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
  60 {
  61         if (a->proto != b->proto)
  62                 return 0;
  63         if (a->vid != b->vid)
  64                 return 0;
  65         switch (a->proto) {
  66         case htons(ETH_P_IP):
  67                 return a->u.ip4 == b->u.ip4;
  68 #if IS_ENABLED(CONFIG_IPV6)
  69         case htons(ETH_P_IPV6):
  70                 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
  71 #endif
  72         }
  73         return 0;
  74 }
  75
  76 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
  77                                 __u16 vid)
  78 {
  79         return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
  80 }
  81
  82 #if IS_ENABLED(CONFIG_IPV6)
  83 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
  84                                 const struct in6_addr *ip,
  85                                 __u16 vid)
  86 {
  87         return jhash_2words(ipv6_addr_hash(ip), vid,
  88                             mdb->secret) & (mdb->max - 1);
  89 }
  90 #endif
  91
  92 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
  93                              struct br_ip *ip)
  94 {
  95         switch (ip->proto) {
  96         case htons(ETH_P_IP):
  97                 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
  98 #if IS_ENABLED(CONFIG_IPV6)
  99         case htons(ETH_P_IPV6):
 100                 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
 101 #endif
 102         }
 103         return 0;
 104 }
 105
 106 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
 107         struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
 108 {
 109         struct net_bridge_mdb_entry *mp;
 110
 111         hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 112                 if (br_ip_equal(&mp->addr, dst))
 113                         return mp;
 114         }
 115
 116         return NULL;
 117 }
 118
 119 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
 120                                            struct br_ip *dst)
 121 {
 122         if (!mdb)
 123                 return NULL;
 124
 125         return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
 126 }
 127
 128 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
 129         struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
 130 {
 131         struct br_ip br_dst;
 132
 133         br_dst.u.ip4 = dst;
 134         br_dst.proto = htons(ETH_P_IP);
 135         br_dst.vid = vid;
 136
 137         return br_mdb_ip_get(mdb, &br_dst);
 138 }
 139
 140 #if IS_ENABLED(CONFIG_IPV6)
 141 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
 142         struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
 143         __u16 vid)
 144 {
 145         struct br_ip br_dst;
 146
 147         br_dst.u.ip6 = *dst;
 148         br_dst.proto = htons(ETH_P_IPV6);
 149         br_dst.vid = vid;
 150
 151         return br_mdb_ip_get(mdb, &br_dst);
 152 }
 153 #endif
 154
 155 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 156                                         struct sk_buff *skb, u16 vid)
 157 {
 158         struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
 159         struct br_ip ip;
 160
 161         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
 162                 return NULL;
 163
 164         if (BR_INPUT_SKB_CB(skb)->igmp)
 165                 return NULL;
 166
 167         ip.proto = skb->protocol;
 168         ip.vid = vid;
 169
 170         switch (skb->protocol) {
 171         case htons(ETH_P_IP):
 172                 ip.u.ip4 = ip_hdr(skb)->daddr;
 173                 break;
 174 #if IS_ENABLED(CONFIG_IPV6)
 175         case htons(ETH_P_IPV6):
 176                 ip.u.ip6 = ipv6_hdr(skb)->daddr;
 177                 break;
 178 #endif
 179         default:
 180                 return NULL;
 181         }
 182
 183         return br_mdb_ip_get(mdb, &ip);
 184 }
 185
 186 static void br_mdb_free(struct rcu_head *head)
 187 {
 188         struct net_bridge_mdb_htable *mdb =
 189                 container_of(head, struct net_bridge_mdb_htable, rcu);
 190         struct net_bridge_mdb_htable *old = mdb->old;
 191
 192         mdb->old = NULL;
 193         kfree(old->mhash);
 194         kfree(old);
 195 }
 196
 197 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
 198                        struct net_bridge_mdb_htable *old,
 199                        int elasticity)
 200 {
 201         struct net_bridge_mdb_entry *mp;
 202         int maxlen;
 203         int len;
 204         int i;
 205
 206         for (i = 0; i < old->max; i++)
 207                 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
 208                         hlist_add_head(&mp->hlist[new->ver],
 209                                        &new->mhash[br_ip_hash(new, &mp->addr)]);
 210
 211         if (!elasticity)
 212                 return 0;
 213
 214         maxlen = 0;
 215         for (i = 0; i < new->max; i++) {
 216                 len = 0;
 217                 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
 218                         len++;
 219                 if (len > maxlen)
 220                         maxlen = len;
 221         }
 222
 223         return maxlen > elasticity ? -EINVAL : 0;
 224 }
 225
 226 void br_multicast_free_pg(struct rcu_head *head)
 227 {
 228         struct net_bridge_port_group *p =
 229                 container_of(head, struct net_bridge_port_group, rcu);
 230
 231         kfree(p);
 232 }
 233
 234 static void br_multicast_free_group(struct rcu_head *head)
 235 {
 236         struct net_bridge_mdb_entry *mp =
 237                 container_of(head, struct net_bridge_mdb_entry, rcu);
 238
 239         kfree(mp);
 240 }
 241
 242 static void br_multicast_group_expired(struct timer_list *t)
 243 {
 244         struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
 245         struct net_bridge *br = mp->br;
 246         struct net_bridge_mdb_htable *mdb;
 247
 248         spin_lock(&br->multicast_lock);
 249         if (!netif_running(br->dev) || timer_pending(&mp->timer))
 250                 goto out;
 251
 252         mp->host_joined = false;
 253         br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
 254
 255         if (mp->ports)
 256                 goto out;
 257
 258         mdb = mlock_dereference(br->mdb, br);
 259
 260         hlist_del_rcu(&mp->hlist[mdb->ver]);
 261         mdb->size--;
 262
 263         call_rcu_bh(&mp->rcu, br_multicast_free_group);
 264
 265 out:
 266         spin_unlock(&br->multicast_lock);
 267 }
 268
 269 static void br_multicast_del_pg(struct net_bridge *br,
 270                                 struct net_bridge_port_group *pg)
 271 {
 272         struct net_bridge_mdb_htable *mdb;
 273         struct net_bridge_mdb_entry *mp;
 274         struct net_bridge_port_group *p;
 275         struct net_bridge_port_group __rcu **pp;
 276
 277         mdb = mlock_dereference(br->mdb, br);
 278
 279         mp = br_mdb_ip_get(mdb, &pg->addr);
 280         if (WARN_ON(!mp))
 281                 return;
 282
 283         for (pp = &mp->ports;
 284              (p = mlock_dereference(*pp, br)) != NULL;
 285              pp = &p->next) {
 286                 if (p != pg)
 287                         continue;
 288
 289                 rcu_assign_pointer(*pp, p->next);
 290                 hlist_del_init(&p->mglist);
 291                 del_timer(&p->timer);
 292                 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
 293                               p->flags);
 294                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
 295
 296                 if (!mp->ports && !mp->host_joined &&
 297                     netif_running(br->dev))
 298                         mod_timer(&mp->timer, jiffies);
 299
 300                 return;
 301         }
 302
 303         WARN_ON(1);
 304 }
 305
 306 static void br_multicast_port_group_expired(struct timer_list *t)
 307 {
 308         struct net_bridge_port_group *pg = from_timer(pg, t, timer);
 309         struct net_bridge *br = pg->port->br;
 310
 311         spin_lock(&br->multicast_lock);
 312         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
 313             hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
 314                 goto out;
 315
 316         br_multicast_del_pg(br, pg);
 317
 318 out:
 319         spin_unlock(&br->multicast_lock);
 320 }
 321
 322 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
 323                          int elasticity)
 324 {
 325         struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
 326         struct net_bridge_mdb_htable *mdb;
 327         int err;
 328
 329         mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
 330         if (!mdb)
 331                 return -ENOMEM;
 332
 333         mdb->max = max;
 334         mdb->old = old;
 335
 336         mdb->mhash = kcalloc(max, sizeof(*mdb->mhash), GFP_ATOMIC);
 337         if (!mdb->mhash) {
 338                 kfree(mdb);
 339                 return -ENOMEM;
 340         }
 341
 342         mdb->size = old ? old->size : 0;
 343         mdb->ver = old ? old->ver ^ 1 : 0;
 344
 345         if (!old || elasticity)
 346                 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
 347         else
 348                 mdb->secret = old->secret;
 349
 350         if (!old)
 351                 goto out;
 352
 353         err = br_mdb_copy(mdb, old, elasticity);
 354         if (err) {
 355                 kfree(mdb->mhash);
 356                 kfree(mdb);
 357                 return err;
 358         }
 359
 360         br_mdb_rehash_seq++;
 361         call_rcu_bh(&mdb->rcu, br_mdb_free);
 362
 363 out:
 364         rcu_assign_pointer(*mdbp, mdb);
 365
 366         return 0;
 367 }
 368
 369 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
 370                                                     __be32 group,
 371                                                     u8 *igmp_type)
 372 {
 373         struct igmpv3_query *ihv3;
 374         size_t igmp_hdr_size;
 375         struct sk_buff *skb;
 376         struct igmphdr *ih;
 377         struct ethhdr *eth;
 378         struct iphdr *iph;
 379
 380         igmp_hdr_size = sizeof(*ih);
 381         if (br->multicast_igmp_version == 3)
 382                 igmp_hdr_size = sizeof(*ihv3);
 383         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
 384                                                  igmp_hdr_size + 4);
 385         if (!skb)
 386                 goto out;
 387
 388         skb->protocol = htons(ETH_P_IP);
 389
 390         skb_reset_mac_header(skb);
 391         eth = eth_hdr(skb);
 392
 393         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 394         eth->h_dest[0] = 1;
 395         eth->h_dest[1] = 0;
 396         eth->h_dest[2] = 0x5e;
 397         eth->h_dest[3] = 0;
 398         eth->h_dest[4] = 0;
 399         eth->h_dest[5] = 1;
 400         eth->h_proto = htons(ETH_P_IP);
 401         skb_put(skb, sizeof(*eth));
 402
 403         skb_set_network_header(skb, skb->len);
 404         iph = ip_hdr(skb);
 405
 406         iph->version = 4;
 407         iph->ihl = 6;
 408         iph->tos = 0xc0;
 409         iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
 410         iph->id = 0;
 411         iph->frag_off = htons(IP_DF);
 412         iph->ttl = 1;
 413         iph->protocol = IPPROTO_IGMP;
 414         iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
 415                      inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
 416         iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 417         ((u8 *)&iph[1])[0] = IPOPT_RA;
 418         ((u8 *)&iph[1])[1] = 4;
 419         ((u8 *)&iph[1])[2] = 0;
 420         ((u8 *)&iph[1])[3] = 0;
 421         ip_send_check(iph);
 422         skb_put(skb, 24);
 423
 424         skb_set_transport_header(skb, skb->len);
 425         *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
 426
 427         switch (br->multicast_igmp_version) {
 428         case 2:
 429                 ih = igmp_hdr(skb);
 430                 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
 431                 ih->code = (group ? br->multicast_last_member_interval :
 432                                     br->multicast_query_response_interval) /
 433                            (HZ / IGMP_TIMER_SCALE);
 434                 ih->group = group;
 435                 ih->csum = 0;
 436                 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
 437                 break;
 438         case 3:
 439                 ihv3 = igmpv3_query_hdr(skb);
 440                 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
 441                 ihv3->code = (group ? br->multicast_last_member_interval :
 442                                       br->multicast_query_response_interval) /
 443                              (HZ / IGMP_TIMER_SCALE);
 444                 ihv3->group = group;
 445                 ihv3->qqic = br->multicast_query_interval / HZ;
 446                 ihv3->nsrcs = 0;
 447                 ihv3->resv = 0;
 448                 ihv3->suppress = 0;
 449                 ihv3->qrv = 2;
 450                 ihv3->csum = 0;
 451                 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
 452                 break;
 453         }
 454
 455         skb_put(skb, igmp_hdr_size);
 456         __skb_pull(skb, sizeof(*eth));
 457
 458 out:
 459         return skb;
 460 }
 461
 462 #if IS_ENABLED(CONFIG_IPV6)
 463 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
 464                                                     const struct in6_addr *grp,
 465                                                     u8 *igmp_type)
 466 {
 467         struct mld2_query *mld2q;
 468         unsigned long interval;
 469         struct ipv6hdr *ip6h;
 470         struct mld_msg *mldq;
 471         size_t mld_hdr_size;
 472         struct sk_buff *skb;
 473         struct ethhdr *eth;
 474         u8 *hopopt;
 475
 476         mld_hdr_size = sizeof(*mldq);
 477         if (br->multicast_mld_version == 2)
 478                 mld_hdr_size = sizeof(*mld2q);
 479         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
 480                                                  8 + mld_hdr_size);
 481         if (!skb)
 482                 goto out;
 483
 484         skb->protocol = htons(ETH_P_IPV6);
 485
 486         /* Ethernet header */
 487         skb_reset_mac_header(skb);
 488         eth = eth_hdr(skb);
 489
 490         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 491         eth->h_proto = htons(ETH_P_IPV6);
 492         skb_put(skb, sizeof(*eth));
 493
 494         /* IPv6 header + HbH option */
 495         skb_set_network_header(skb, skb->len);
 496         ip6h = ipv6_hdr(skb);
 497
 498         *(__force __be32 *)ip6h = htonl(0x60000000);
 499         ip6h->payload_len = htons(8 + mld_hdr_size);
 500         ip6h->nexthdr = IPPROTO_HOPOPTS;
 501         ip6h->hop_limit = 1;
 502         ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
 503         if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
 504                                &ip6h->saddr)) {
 505                 kfree_skb(skb);
 506                 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
 507                 return NULL;
 508         }
 509
 510         br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
 511         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 512
 513         hopopt = (u8 *)(ip6h + 1);
 514         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
 515         hopopt[1] = 0;                          /* length of HbH */
 516         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
 517         hopopt[3] = 2;                          /* Length of RA Option */
 518         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
 519         hopopt[5] = 0;
 520         hopopt[6] = IPV6_TLV_PAD1;              /* Pad1 */
 521         hopopt[7] = IPV6_TLV_PAD1;              /* Pad1 */
 522
 523         skb_put(skb, sizeof(*ip6h) + 8);
 524
 525         /* ICMPv6 */
 526         skb_set_transport_header(skb, skb->len);
 527         interval = ipv6_addr_any(grp) ?
 528                         br->multicast_query_response_interval :
 529                         br->multicast_last_member_interval;
 530         *igmp_type = ICMPV6_MGM_QUERY;
 531         switch (br->multicast_mld_version) {
 532         case 1:
 533                 mldq = (struct mld_msg *)icmp6_hdr(skb);
 534                 mldq->mld_type = ICMPV6_MGM_QUERY;
 535                 mldq->mld_code = 0;
 536                 mldq->mld_cksum = 0;
 537                 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
 538                 mldq->mld_reserved = 0;
 539                 mldq->mld_mca = *grp;
 540                 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 541                                                   sizeof(*mldq), IPPROTO_ICMPV6,
 542                                                   csum_partial(mldq,
 543                                                                sizeof(*mldq),
 544                                                                0));
 545                 break;
 546         case 2:
 547                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
 548                 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
 549                 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
 550                 mld2q->mld2q_code = 0;
 551                 mld2q->mld2q_cksum = 0;
 552                 mld2q->mld2q_resv1 = 0;
 553                 mld2q->mld2q_resv2 = 0;
 554                 mld2q->mld2q_suppress = 0;
 555                 mld2q->mld2q_qrv = 2;
 556                 mld2q->mld2q_nsrcs = 0;
 557                 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
 558                 mld2q->mld2q_mca = *grp;
 559                 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 560                                                      sizeof(*mld2q),
 561                                                      IPPROTO_ICMPV6,
 562                                                      csum_partial(mld2q,
 563                                                                   sizeof(*mld2q),
 564                                                                   0));
 565                 break;
 566         }
 567         skb_put(skb, mld_hdr_size);
 568
 569         __skb_pull(skb, sizeof(*eth));
 570
 571 out:
 572         return skb;
 573 }
 574 #endif
 575
 576 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 577                                                 struct br_ip *addr,
 578                                                 u8 *igmp_type)
 579 {
 580         switch (addr->proto) {
 581         case htons(ETH_P_IP):
 582                 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
 583 #if IS_ENABLED(CONFIG_IPV6)
 584         case htons(ETH_P_IPV6):
 585                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
 586                                                     igmp_type);
 587 #endif
 588         }
 589         return NULL;
 590 }
 591
 592 static struct net_bridge_mdb_entry *br_multicast_get_group(
 593         struct net_bridge *br, struct net_bridge_port *port,
 594         struct br_ip *group, int hash)
 595 {
 596         struct net_bridge_mdb_htable *mdb;
 597         struct net_bridge_mdb_entry *mp;
 598         unsigned int count = 0;
 599         unsigned int max;
 600         int elasticity;
 601         int err;
 602
 603         mdb = rcu_dereference_protected(br->mdb, 1);
 604         hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 605                 count++;
 606                 if (unlikely(br_ip_equal(group, &mp->addr)))
 607                         return mp;
 608         }
 609
 610         elasticity = 0;
 611         max = mdb->max;
 612
 613         if (unlikely(count > br->hash_elasticity && count)) {
 614                 if (net_ratelimit())
 615                         br_info(br, "Multicast hash table "
 616                                 "chain limit reached: %s\n",
 617                                 port ? port->dev->name : br->dev->name);
 618
 619                 elasticity = br->hash_elasticity;
 620         }
 621
 622         if (mdb->size >= max) {
 623                 max *= 2;
 624                 if (unlikely(max > br->hash_max)) {
 625                         br_warn(br, "Multicast hash table maximum of %d "
 626                                 "reached, disabling snooping: %s\n",
 627                                 br->hash_max,
 628                                 port ? port->dev->name : br->dev->name);
 629                         err = -E2BIG;
 630 disable:
 631                         br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
 632                         goto err;
 633                 }
 634         }
 635
 636         if (max > mdb->max || elasticity) {
 637                 if (mdb->old) {
 638                         if (net_ratelimit())
 639                                 br_info(br, "Multicast hash table "
 640                                         "on fire: %s\n",
 641                                         port ? port->dev->name : br->dev->name);
 642                         err = -EEXIST;
 643                         goto err;
 644                 }
 645
 646                 err = br_mdb_rehash(&br->mdb, max, elasticity);
 647                 if (err) {
 648                         br_warn(br, "Cannot rehash multicast "
 649                                 "hash table, disabling snooping: %s, %d, %d\n",
 650                                 port ? port->dev->name : br->dev->name,
 651                                 mdb->size, err);
 652                         goto disable;
 653                 }
 654
 655                 err = -EAGAIN;
 656                 goto err;
 657         }
 658
 659         return NULL;
 660
 661 err:
 662         mp = ERR_PTR(err);
 663         return mp;
 664 }
 665
 666 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 667                                                     struct net_bridge_port *p,
 668                                                     struct br_ip *group)
 669 {
 670         struct net_bridge_mdb_htable *mdb;
 671         struct net_bridge_mdb_entry *mp;
 672         int hash;
 673         int err;
 674
 675         mdb = rcu_dereference_protected(br->mdb, 1);
 676         if (!mdb) {
 677                 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
 678                 if (err)
 679                         return ERR_PTR(err);
 680                 goto rehash;
 681         }
 682
 683         hash = br_ip_hash(mdb, group);
 684         mp = br_multicast_get_group(br, p, group, hash);
 685         switch (PTR_ERR(mp)) {
 686         case 0:
 687                 break;
 688
 689         case -EAGAIN:
 690 rehash:
 691                 mdb = rcu_dereference_protected(br->mdb, 1);
 692                 hash = br_ip_hash(mdb, group);
 693                 break;
 694
 695         default:
 696                 goto out;
 697         }
 698
 699         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 700         if (unlikely(!mp))
 701                 return ERR_PTR(-ENOMEM);
 702
 703         mp->br = br;
 704         mp->addr = *group;
 705         timer_setup(&mp->timer, br_multicast_group_expired, 0);
 706
 707         hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
 708         mdb->size++;
 709
 710 out:
 711         return mp;
 712 }
 713
 714 struct net_bridge_port_group *br_multicast_new_port_group(
 715                         struct net_bridge_port *port,
 716                         struct br_ip *group,
 717                         struct net_bridge_port_group __rcu *next,
 718                         unsigned char flags,
 719                         const unsigned char *src)
 720 {
 721         struct net_bridge_port_group *p;
 722
 723         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 724         if (unlikely(!p))
 725                 return NULL;
 726
 727         p->addr = *group;
 728         p->port = port;
 729         p->flags = flags;
 730         rcu_assign_pointer(p->next, next);
 731         hlist_add_head(&p->mglist, &port->mglist);
 732         timer_setup(&p->timer, br_multicast_port_group_expired, 0);
 733
 734         if (src)
 735                 memcpy(p->eth_addr, src, ETH_ALEN);
 736         else
 737                 memset(p->eth_addr, 0xff, ETH_ALEN);
 738
 739         return p;
 740 }
 741
 742 static bool br_port_group_equal(struct net_bridge_port_group *p,
 743                                 struct net_bridge_port *port,
 744                                 const unsigned char *src)
 745 {
 746         if (p->port != port)
 747                 return false;
 748
 749         if (!(port->flags & BR_MULTICAST_TO_UNICAST))
 750                 return true;
 751
 752         return ether_addr_equal(src, p->eth_addr);
 753 }
 754
 755 static int br_multicast_add_group(struct net_bridge *br,
 756                                   struct net_bridge_port *port,
 757                                   struct br_ip *group,
 758                                   const unsigned char *src)
 759 {
 760         struct net_bridge_port_group __rcu **pp;
 761         struct net_bridge_port_group *p;
 762         struct net_bridge_mdb_entry *mp;
 763         unsigned long now = jiffies;
 764         int err;
 765
 766         spin_lock(&br->multicast_lock);
 767         if (!netif_running(br->dev) ||
 768             (port && port->state == BR_STATE_DISABLED))
 769                 goto out;
 770
 771         mp = br_multicast_new_group(br, port, group);
 772         err = PTR_ERR(mp);
 773         if (IS_ERR(mp))
 774                 goto err;
 775
 776         if (!port) {
 777                 if (!mp->host_joined) {
 778                         mp->host_joined = true;
 779                         br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0);
 780                 }
 781                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
 782                 goto out;
 783         }
 784
 785         for (pp = &mp->ports;
 786              (p = mlock_dereference(*pp, br)) != NULL;
 787              pp = &p->next) {
 788                 if (br_port_group_equal(p, port, src))
 789                         goto found;
 790                 if ((unsigned long)p->port < (unsigned long)port)
 791                         break;
 792         }
 793
 794         p = br_multicast_new_port_group(port, group, *pp, 0, src);
 795         if (unlikely(!p))
 796                 goto err;
 797         rcu_assign_pointer(*pp, p);
 798         br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
 799
 800 found:
 801         mod_timer(&p->timer, now + br->multicast_membership_interval);
 802 out:
 803         err = 0;
 804
 805 err:
 806         spin_unlock(&br->multicast_lock);
 807         return err;
 808 }
 809
 810 static int br_ip4_multicast_add_group(struct net_bridge *br,
 811                                       struct net_bridge_port *port,
 812                                       __be32 group,
 813                                       __u16 vid,
 814                                       const unsigned char *src)
 815 {
 816         struct br_ip br_group;
 817
 818         if (ipv4_is_local_multicast(group))
 819                 return 0;
 820
 821         br_group.u.ip4 = group;
 822         br_group.proto = htons(ETH_P_IP);
 823         br_group.vid = vid;
 824
 825         return br_multicast_add_group(br, port, &br_group, src);
 826 }
 827
 828 #if IS_ENABLED(CONFIG_IPV6)
 829 static int br_ip6_multicast_add_group(struct net_bridge *br,
 830                                       struct net_bridge_port *port,
 831                                       const struct in6_addr *group,
 832                                       __u16 vid,
 833                                       const unsigned char *src)
 834 {
 835         struct br_ip br_group;
 836
 837         if (ipv6_addr_is_ll_all_nodes(group))
 838                 return 0;
 839
 840         br_group.u.ip6 = *group;
 841         br_group.proto = htons(ETH_P_IPV6);
 842         br_group.vid = vid;
 843
 844         return br_multicast_add_group(br, port, &br_group, src);
 845 }
 846 #endif
 847
 848 static void br_multicast_router_expired(struct timer_list *t)
 849 {
 850         struct net_bridge_port *port =
 851                         from_timer(port, t, multicast_router_timer);
 852         struct net_bridge *br = port->br;
 853
 854         spin_lock(&br->multicast_lock);
 855         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
 856             port->multicast_router == MDB_RTR_TYPE_PERM ||
 857             timer_pending(&port->multicast_router_timer))
 858                 goto out;
 859
 860         __del_port_router(port);
 861 out:
 862         spin_unlock(&br->multicast_lock);
 863 }
 864
 865 static void br_mc_router_state_change(struct net_bridge *p,
 866                                       bool is_mc_router)
 867 {
 868         struct switchdev_attr attr = {
 869                 .orig_dev = p->dev,
 870                 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
 871                 .flags = SWITCHDEV_F_DEFER,
 872                 .u.mrouter = is_mc_router,
 873         };
 874
 875         switchdev_port_attr_set(p->dev, &attr);
 876 }
 877
 878 static void br_multicast_local_router_expired(struct timer_list *t)
 879 {
 880         struct net_bridge *br = from_timer(br, t, multicast_router_timer);
 881
 882         spin_lock(&br->multicast_lock);
 883         if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
 884             br->multicast_router == MDB_RTR_TYPE_PERM ||
 885             timer_pending(&br->multicast_router_timer))
 886                 goto out;
 887
 888         br_mc_router_state_change(br, false);
 889 out:
 890         spin_unlock(&br->multicast_lock);
 891 }
 892
 893 static void br_multicast_querier_expired(struct net_bridge *br,
 894                                          struct bridge_mcast_own_query *query)
 895 {
 896         spin_lock(&br->multicast_lock);
 897         if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
 898                 goto out;
 899
 900         br_multicast_start_querier(br, query);
 901
 902 out:
 903         spin_unlock(&br->multicast_lock);
 904 }
 905
 906 static void br_ip4_multicast_querier_expired(struct timer_list *t)
 907 {
 908         struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
 909
 910         br_multicast_querier_expired(br, &br->ip4_own_query);
 911 }
 912
 913 #if IS_ENABLED(CONFIG_IPV6)
 914 static void br_ip6_multicast_querier_expired(struct timer_list *t)
 915 {
 916         struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
 917
 918         br_multicast_querier_expired(br, &br->ip6_own_query);
 919 }
 920 #endif
 921
 922 static void br_multicast_select_own_querier(struct net_bridge *br,
 923                                             struct br_ip *ip,
 924                                             struct sk_buff *skb)
 925 {
 926         if (ip->proto == htons(ETH_P_IP))
 927                 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
 928 #if IS_ENABLED(CONFIG_IPV6)
 929         else
 930                 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
 931 #endif
 932 }
 933
 934 static void __br_multicast_send_query(struct net_bridge *br,
 935                                       struct net_bridge_port *port,
 936                                       struct br_ip *ip)
 937 {
 938         struct sk_buff *skb;
 939         u8 igmp_type;
 940
 941         skb = br_multicast_alloc_query(br, ip, &igmp_type);
 942         if (!skb)
 943                 return;
 944
 945         if (port) {
 946                 skb->dev = port->dev;
 947                 br_multicast_count(br, port, skb, igmp_type,
 948                                    BR_MCAST_DIR_TX);
 949                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
 950                         dev_net(port->dev), NULL, skb, NULL, skb->dev,
 951                         br_dev_queue_push_xmit);
 952         } else {
 953                 br_multicast_select_own_querier(br, ip, skb);
 954                 br_multicast_count(br, port, skb, igmp_type,
 955                                    BR_MCAST_DIR_RX);
 956                 netif_rx(skb);
 957         }
 958 }
 959
 960 static void br_multicast_send_query(struct net_bridge *br,
 961                                     struct net_bridge_port *port,
 962                                     struct bridge_mcast_own_query *own_query)
 963 {
 964         struct bridge_mcast_other_query *other_query = NULL;
 965         struct br_ip br_group;
 966         unsigned long time;
 967
 968         if (!netif_running(br->dev) ||
 969             !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
 970             !br_opt_get(br, BROPT_MULTICAST_QUERIER))
 971                 return;
 972
 973         memset(&br_group.u, 0, sizeof(br_group.u));
 974
 975         if (port ? (own_query == &port->ip4_own_query) :
 976                    (own_query == &br->ip4_own_query)) {
 977                 other_query = &br->ip4_other_query;
 978                 br_group.proto = htons(ETH_P_IP);
 979 #if IS_ENABLED(CONFIG_IPV6)
 980         } else {
 981                 other_query = &br->ip6_other_query;
 982                 br_group.proto = htons(ETH_P_IPV6);
 983 #endif
 984         }
 985
 986         if (!other_query || timer_pending(&other_query->timer))
 987                 return;
 988
 989         __br_multicast_send_query(br, port, &br_group);
 990
 991         time = jiffies;
 992         time += own_query->startup_sent < br->multicast_startup_query_count ?
 993                 br->multicast_startup_query_interval :
 994                 br->multicast_query_interval;
 995         mod_timer(&own_query->timer, time);
 996 }
 997
 998 static void
 999 br_multicast_port_query_expired(struct net_bridge_port *port,
1000                                 struct bridge_mcast_own_query *query)
1001 {
1002         struct net_bridge *br = port->br;
1003
1004         spin_lock(&br->multicast_lock);
1005         if (port->state == BR_STATE_DISABLED ||
1006             port->state == BR_STATE_BLOCKING)
1007                 goto out;
1008
1009         if (query->startup_sent < br->multicast_startup_query_count)
1010                 query->startup_sent++;
1011
1012         br_multicast_send_query(port->br, port, query);
1013
1014 out:
1015         spin_unlock(&br->multicast_lock);
1016 }
1017
1018 static void br_ip4_multicast_port_query_expired(struct timer_list *t)
1019 {
1020         struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
1021
1022         br_multicast_port_query_expired(port, &port->ip4_own_query);
1023 }
1024
1025 #if IS_ENABLED(CONFIG_IPV6)
1026 static void br_ip6_multicast_port_query_expired(struct timer_list *t)
1027 {
1028         struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
1029
1030         br_multicast_port_query_expired(port, &port->ip6_own_query);
1031 }
1032 #endif
1033
1034 static void br_mc_disabled_update(struct net_device *dev, bool value)
1035 {
1036         struct switchdev_attr attr = {
1037                 .orig_dev = dev,
1038                 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1039                 .flags = SWITCHDEV_F_DEFER,
1040                 .u.mc_disabled = !value,
1041         };
1042
1043         switchdev_port_attr_set(dev, &attr);
1044 }
1045
1046 int br_multicast_add_port(struct net_bridge_port *port)
1047 {
1048         port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1049
1050         timer_setup(&port->multicast_router_timer,
1051                     br_multicast_router_expired, 0);
1052         timer_setup(&port->ip4_own_query.timer,
1053                     br_ip4_multicast_port_query_expired, 0);
1054 #if IS_ENABLED(CONFIG_IPV6)
1055         timer_setup(&port->ip6_own_query.timer,
1056                     br_ip6_multicast_port_query_expired, 0);
1057 #endif
1058         br_mc_disabled_update(port->dev,
1059                               br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
1060
1061         port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
1062         if (!port->mcast_stats)
1063                 return -ENOMEM;
1064
1065         return 0;
1066 }
1067
1068 void br_multicast_del_port(struct net_bridge_port *port)
1069 {
1070         struct net_bridge *br = port->br;
1071         struct net_bridge_port_group *pg;
1072         struct hlist_node *n;
1073
1074         /* Take care of the remaining groups, only perm ones should be left */
1075         spin_lock_bh(&br->multicast_lock);
1076         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1077                 br_multicast_del_pg(br, pg);
1078         spin_unlock_bh(&br->multicast_lock);
1079         del_timer_sync(&port->multicast_router_timer);
1080         free_percpu(port->mcast_stats);
1081 }
1082
1083 static void br_multicast_enable(struct bridge_mcast_own_query *query)
1084 {
1085         query->startup_sent = 0;
1086
1087         if (try_to_del_timer_sync(&query->timer) >= 0 ||
1088             del_timer(&query->timer))
1089                 mod_timer(&query->timer, jiffies);
1090 }
1091
1092 static void __br_multicast_enable_port(struct net_bridge_port *port)
1093 {
1094         struct net_bridge *br = port->br;
1095
1096         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
1097                 return;
1098
1099         br_multicast_enable(&port->ip4_own_query);
1100 #if IS_ENABLED(CONFIG_IPV6)
1101         br_multicast_enable(&port->ip6_own_query);
1102 #endif
1103         if (port->multicast_router == MDB_RTR_TYPE_PERM &&
1104             hlist_unhashed(&port->rlist))
1105                 br_multicast_add_router(br, port);
1106 }
1107
1108 void br_multicast_enable_port(struct net_bridge_port *port)
1109 {
1110         struct net_bridge *br = port->br;
1111
1112         spin_lock(&br->multicast_lock);
1113         __br_multicast_enable_port(port);
1114         spin_unlock(&br->multicast_lock);
1115 }
1116
1117 void br_multicast_disable_port(struct net_bridge_port *port)
1118 {
1119         struct net_bridge *br = port->br;
1120         struct net_bridge_port_group *pg;
1121         struct hlist_node *n;
1122
1123         spin_lock(&br->multicast_lock);
1124         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1125                 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1126                         br_multicast_del_pg(br, pg);
1127
1128         __del_port_router(port);
1129
1130         del_timer(&port->multicast_router_timer);
1131         del_timer(&port->ip4_own_query.timer);
1132 #if IS_ENABLED(CONFIG_IPV6)
1133         del_timer(&port->ip6_own_query.timer);
1134 #endif
1135         spin_unlock(&br->multicast_lock);
1136 }
1137
1138 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1139                                          struct net_bridge_port *port,
1140                                          struct sk_buff *skb,
1141                                          u16 vid)
1142 {
1143         const unsigned char *src;
1144         struct igmpv3_report *ih;
1145         struct igmpv3_grec *grec;
1146         int i;
1147         int len;
1148         int num;
1149         int type;
1150         int err = 0;
1151         __be32 group;
1152
1153         ih = igmpv3_report_hdr(skb);
1154         num = ntohs(ih->ngrec);
1155         len = skb_transport_offset(skb) + sizeof(*ih);
1156
1157         for (i = 0; i < num; i++) {
1158                 len += sizeof(*grec);
1159                 if (!pskb_may_pull(skb, len))
1160                         return -EINVAL;
1161
1162                 grec = (void *)(skb->data + len - sizeof(*grec));
1163                 group = grec->grec_mca;
1164                 type = grec->grec_type;
1165
1166                 len += ntohs(grec->grec_nsrcs) * 4;
1167                 if (!pskb_may_pull(skb, len))
1168                         return -EINVAL;
1169
1170                 /* We treat this as an IGMPv2 report for now. */
1171                 switch (type) {
1172                 case IGMPV3_MODE_IS_INCLUDE:
1173                 case IGMPV3_MODE_IS_EXCLUDE:
1174                 case IGMPV3_CHANGE_TO_INCLUDE:
1175                 case IGMPV3_CHANGE_TO_EXCLUDE:
1176                 case IGMPV3_ALLOW_NEW_SOURCES:
1177                 case IGMPV3_BLOCK_OLD_SOURCES:
1178                         break;
1179
1180                 default:
1181                         continue;
1182                 }
1183
1184                 src = eth_hdr(skb)->h_source;
1185                 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1186                      type == IGMPV3_MODE_IS_INCLUDE) &&
1187                     ntohs(grec->grec_nsrcs) == 0) {
1188                         br_ip4_multicast_leave_group(br, port, group, vid, src);
1189                 } else {
1190                         err = br_ip4_multicast_add_group(br, port, group, vid,
1191                                                          src);
1192                         if (err)
1193                                 break;
1194                 }
1195         }
1196
1197         return err;
1198 }
1199
1200 #if IS_ENABLED(CONFIG_IPV6)
1201 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1202                                         struct net_bridge_port *port,
1203                                         struct sk_buff *skb,
1204                                         u16 vid)
1205 {
1206         const unsigned char *src;
1207         struct icmp6hdr *icmp6h;
1208         struct mld2_grec *grec;
1209         int i;
1210         int len;
1211         int num;
1212         int err = 0;
1213
1214         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1215                 return -EINVAL;
1216
1217         icmp6h = icmp6_hdr(skb);
1218         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1219         len = skb_transport_offset(skb) + sizeof(*icmp6h);
1220
1221         for (i = 0; i < num; i++) {
1222                 __be16 *nsrcs, _nsrcs;
1223
1224                 nsrcs = skb_header_pointer(skb,
1225                                            len + offsetof(struct mld2_grec,
1226                                                           grec_nsrcs),
1227                                            sizeof(_nsrcs), &_nsrcs);
1228                 if (!nsrcs)
1229                         return -EINVAL;
1230
1231                 if (!pskb_may_pull(skb,
1232                                    len + sizeof(*grec) +
1233                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
1234                         return -EINVAL;
1235
1236                 grec = (struct mld2_grec *)(skb->data + len);
1237                 len += sizeof(*grec) +
1238                        sizeof(struct in6_addr) * ntohs(*nsrcs);
1239
1240                 /* We treat these as MLDv1 reports for now. */
1241                 switch (grec->grec_type) {
1242                 case MLD2_MODE_IS_INCLUDE:
1243                 case MLD2_MODE_IS_EXCLUDE:
1244                 case MLD2_CHANGE_TO_INCLUDE:
1245                 case MLD2_CHANGE_TO_EXCLUDE:
1246                 case MLD2_ALLOW_NEW_SOURCES:
1247                 case MLD2_BLOCK_OLD_SOURCES:
1248                         break;
1249
1250                 default:
1251                         continue;
1252                 }
1253
1254                 src = eth_hdr(skb)->h_source;
1255                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1256                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1257                     ntohs(*nsrcs) == 0) {
1258                         br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1259                                                      vid, src);
1260                 } else {
1261                         err = br_ip6_multicast_add_group(br, port,
1262                                                          &grec->grec_mca, vid,
1263                                                          src);
1264                         if (err)
1265                                 break;
1266                 }
1267         }
1268
1269         return err;
1270 }
1271 #endif
1272
1273 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1274                                             struct net_bridge_port *port,
1275                                             __be32 saddr)
1276 {
1277         if (!timer_pending(&br->ip4_own_query.timer) &&
1278             !timer_pending(&br->ip4_other_query.timer))
1279                 goto update;
1280
1281         if (!br->ip4_querier.addr.u.ip4)
1282                 goto update;
1283
1284         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1285                 goto update;
1286
1287         return false;
1288
1289 update:
1290         br->ip4_querier.addr.u.ip4 = saddr;
1291
1292         /* update protected by general multicast_lock by caller */
1293         rcu_assign_pointer(br->ip4_querier.port, port);
1294
1295         return true;
1296 }
1297
1298 #if IS_ENABLED(CONFIG_IPV6)
1299 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1300                                             struct net_bridge_port *port,
1301                                             struct in6_addr *saddr)
1302 {
1303         if (!timer_pending(&br->ip6_own_query.timer) &&
1304             !timer_pending(&br->ip6_other_query.timer))
1305                 goto update;
1306
1307         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1308                 goto update;
1309
1310         return false;
1311
1312 update:
1313         br->ip6_querier.addr.u.ip6 = *saddr;
1314
1315         /* update protected by general multicast_lock by caller */
1316         rcu_assign_pointer(br->ip6_querier.port, port);
1317
1318         return true;
1319 }
1320 #endif
1321
1322 static bool br_multicast_select_querier(struct net_bridge *br,
1323                                         struct net_bridge_port *port,
1324                                         struct br_ip *saddr)
1325 {
1326         switch (saddr->proto) {
1327         case htons(ETH_P_IP):
1328                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1329 #if IS_ENABLED(CONFIG_IPV6)
1330         case htons(ETH_P_IPV6):
1331                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1332 #endif
1333         }
1334
1335         return false;
1336 }
1337
1338 static void
1339 br_multicast_update_query_timer(struct net_bridge *br,
1340                                 struct bridge_mcast_other_query *query,
1341                                 unsigned long max_delay)
1342 {
1343         if (!timer_pending(&query->timer))
1344                 query->delay_time = jiffies + max_delay;
1345
1346         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1347 }
1348
1349 static void br_port_mc_router_state_change(struct net_bridge_port *p,
1350                                            bool is_mc_router)
1351 {
1352         struct switchdev_attr attr = {
1353                 .orig_dev = p->dev,
1354                 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1355                 .flags = SWITCHDEV_F_DEFER,
1356                 .u.mrouter = is_mc_router,
1357         };
1358
1359         switchdev_port_attr_set(p->dev, &attr);
1360 }
1361
1362 /*
1363  * Add port to router_list
1364  *  list is maintained ordered by pointer value
1365  *  and locked by br->multicast_lock and RCU
1366  */
1367 static void br_multicast_add_router(struct net_bridge *br,
1368                                     struct net_bridge_port *port)
1369 {
1370         struct net_bridge_port *p;
1371         struct hlist_node *slot = NULL;
1372
1373         if (!hlist_unhashed(&port->rlist))
1374                 return;
1375
1376         hlist_for_each_entry(p, &br->router_list, rlist) {
1377                 if ((unsigned long) port >= (unsigned long) p)
1378                         break;
1379                 slot = &p->rlist;
1380         }
1381
1382         if (slot)
1383                 hlist_add_behind_rcu(&port->rlist, slot);
1384         else
1385                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1386         br_rtr_notify(br->dev, port, RTM_NEWMDB);
1387         br_port_mc_router_state_change(port, true);
1388 }
1389
1390 static void br_multicast_mark_router(struct net_bridge *br,
1391                                      struct net_bridge_port *port)
1392 {
1393         unsigned long now = jiffies;
1394
1395         if (!port) {
1396                 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1397                         if (!timer_pending(&br->multicast_router_timer))
1398                                 br_mc_router_state_change(br, true);
1399                         mod_timer(&br->multicast_router_timer,
1400                                   now + br->multicast_querier_interval);
1401                 }
1402                 return;
1403         }
1404
1405         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1406             port->multicast_router == MDB_RTR_TYPE_PERM)
1407                 return;
1408
1409         br_multicast_add_router(br, port);
1410
1411         mod_timer(&port->multicast_router_timer,
1412                   now + br->multicast_querier_interval);
1413 }
1414
1415 static void br_multicast_query_received(struct net_bridge *br,
1416                                         struct net_bridge_port *port,
1417                                         struct bridge_mcast_other_query *query,
1418                                         struct br_ip *saddr,
1419                                         unsigned long max_delay)
1420 {
1421         if (!br_multicast_select_querier(br, port, saddr))
1422                 return;
1423
1424         br_multicast_update_query_timer(br, query, max_delay);
1425         br_multicast_mark_router(br, port);
1426 }
1427
1428 static void br_ip4_multicast_query(struct net_bridge *br,
1429                                    struct net_bridge_port *port,
1430                                    struct sk_buff *skb,
1431                                    u16 vid)
1432 {
1433         const struct iphdr *iph = ip_hdr(skb);
1434         struct igmphdr *ih = igmp_hdr(skb);
1435         struct net_bridge_mdb_entry *mp;
1436         struct igmpv3_query *ih3;
1437         struct net_bridge_port_group *p;
1438         struct net_bridge_port_group __rcu **pp;
1439         struct br_ip saddr;
1440         unsigned long max_delay;
1441         unsigned long now = jiffies;
1442         unsigned int offset = skb_transport_offset(skb);
1443         __be32 group;
1444
1445         spin_lock(&br->multicast_lock);
1446         if (!netif_running(br->dev) ||
1447             (port && port->state == BR_STATE_DISABLED))
1448                 goto out;
1449
1450         group = ih->group;
1451
1452         if (skb->len == offset + sizeof(*ih)) {
1453                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1454
1455                 if (!max_delay) {
1456                         max_delay = 10 * HZ;
1457                         group = 0;
1458                 }
1459         } else if (skb->len >= offset + sizeof(*ih3)) {
1460                 ih3 = igmpv3_query_hdr(skb);
1461                 if (ih3->nsrcs)
1462                         goto out;
1463
1464                 max_delay = ih3->code ?
1465                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1466         } else {
1467                 goto out;
1468         }
1469
1470         if (!group) {
1471                 saddr.proto = htons(ETH_P_IP);
1472                 saddr.u.ip4 = iph->saddr;
1473
1474                 br_multicast_query_received(br, port, &br->ip4_other_query,
1475                                             &saddr, max_delay);
1476                 goto out;
1477         }
1478
1479         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1480         if (!mp)
1481                 goto out;
1482
1483         max_delay *= br->multicast_last_member_count;
1484
1485         if (mp->host_joined &&
1486             (timer_pending(&mp->timer) ?
1487              time_after(mp->timer.expires, now + max_delay) :
1488              try_to_del_timer_sync(&mp->timer) >= 0))
1489                 mod_timer(&mp->timer, now + max_delay);
1490
1491         for (pp = &mp->ports;
1492              (p = mlock_dereference(*pp, br)) != NULL;
1493              pp = &p->next) {
1494                 if (timer_pending(&p->timer) ?
1495                     time_after(p->timer.expires, now + max_delay) :
1496                     try_to_del_timer_sync(&p->timer) >= 0)
1497                         mod_timer(&p->timer, now + max_delay);
1498         }
1499
1500 out:
1501         spin_unlock(&br->multicast_lock);
1502 }
1503
1504 #if IS_ENABLED(CONFIG_IPV6)
1505 static int br_ip6_multicast_query(struct net_bridge *br,
1506                                   struct net_bridge_port *port,
1507                                   struct sk_buff *skb,
1508                                   u16 vid)
1509 {
1510         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1511         struct mld_msg *mld;
1512         struct net_bridge_mdb_entry *mp;
1513         struct mld2_query *mld2q;
1514         struct net_bridge_port_group *p;
1515         struct net_bridge_port_group __rcu **pp;
1516         struct br_ip saddr;
1517         unsigned long max_delay;
1518         unsigned long now = jiffies;
1519         unsigned int offset = skb_transport_offset(skb);
1520         const struct in6_addr *group = NULL;
1521         bool is_general_query;
1522         int err = 0;
1523
1524         spin_lock(&br->multicast_lock);
1525         if (!netif_running(br->dev) ||
1526             (port && port->state == BR_STATE_DISABLED))
1527                 goto out;
1528
1529         if (skb->len == offset + sizeof(*mld)) {
1530                 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1531                         err = -EINVAL;
1532                         goto out;
1533                 }
1534                 mld = (struct mld_msg *) icmp6_hdr(skb);
1535                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1536                 if (max_delay)
1537                         group = &mld->mld_mca;
1538         } else {
1539                 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1540                         err = -EINVAL;
1541                         goto out;
1542                 }
1543                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1544                 if (!mld2q->mld2q_nsrcs)
1545                         group = &mld2q->mld2q_mca;
1546
1547                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1548         }
1549
1550         is_general_query = group && ipv6_addr_any(group);
1551
1552         if (is_general_query) {
1553                 saddr.proto = htons(ETH_P_IPV6);
1554                 saddr.u.ip6 = ip6h->saddr;
1555
1556                 br_multicast_query_received(br, port, &br->ip6_other_query,
1557                                             &saddr, max_delay);
1558                 goto out;
1559         } else if (!group) {
1560                 goto out;
1561         }
1562
1563         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1564         if (!mp)
1565                 goto out;
1566
1567         max_delay *= br->multicast_last_member_count;
1568         if (mp->host_joined &&
1569             (timer_pending(&mp->timer) ?
1570              time_after(mp->timer.expires, now + max_delay) :
1571              try_to_del_timer_sync(&mp->timer) >= 0))
1572                 mod_timer(&mp->timer, now + max_delay);
1573
1574         for (pp = &mp->ports;
1575              (p = mlock_dereference(*pp, br)) != NULL;
1576              pp = &p->next) {
1577                 if (timer_pending(&p->timer) ?
1578                     time_after(p->timer.expires, now + max_delay) :
1579                     try_to_del_timer_sync(&p->timer) >= 0)
1580                         mod_timer(&p->timer, now + max_delay);
1581         }
1582
1583 out:
1584         spin_unlock(&br->multicast_lock);
1585         return err;
1586 }
1587 #endif
1588
1589 static void
1590 br_multicast_leave_group(struct net_bridge *br,
1591                          struct net_bridge_port *port,
1592                          struct br_ip *group,
1593                          struct bridge_mcast_other_query *other_query,
1594                          struct bridge_mcast_own_query *own_query,
1595                          const unsigned char *src)
1596 {
1597         struct net_bridge_mdb_htable *mdb;
1598         struct net_bridge_mdb_entry *mp;
1599         struct net_bridge_port_group *p;
1600         unsigned long now;
1601         unsigned long time;
1602
1603         spin_lock(&br->multicast_lock);
1604         if (!netif_running(br->dev) ||
1605             (port && port->state == BR_STATE_DISABLED))
1606                 goto out;
1607
1608         mdb = mlock_dereference(br->mdb, br);
1609         mp = br_mdb_ip_get(mdb, group);
1610         if (!mp)
1611                 goto out;
1612
1613         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1614                 struct net_bridge_port_group __rcu **pp;
1615
1616                 for (pp = &mp->ports;
1617                      (p = mlock_dereference(*pp, br)) != NULL;
1618                      pp = &p->next) {
1619                         if (!br_port_group_equal(p, port, src))
1620                                 continue;
1621
1622                         rcu_assign_pointer(*pp, p->next);
1623                         hlist_del_init(&p->mglist);
1624                         del_timer(&p->timer);
1625                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1626                         br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1627                                       p->flags);
1628
1629                         if (!mp->ports && !mp->host_joined &&
1630                             netif_running(br->dev))
1631                                 mod_timer(&mp->timer, jiffies);
1632                 }
1633                 goto out;
1634         }
1635
1636         if (timer_pending(&other_query->timer))
1637                 goto out;
1638
1639         if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
1640                 __br_multicast_send_query(br, port, &mp->addr);
1641
1642                 time = jiffies + br->multicast_last_member_count *
1643                                  br->multicast_last_member_interval;
1644
1645                 mod_timer(&own_query->timer, time);
1646
1647                 for (p = mlock_dereference(mp->ports, br);
1648                      p != NULL;
1649                      p = mlock_dereference(p->next, br)) {
1650                         if (!br_port_group_equal(p, port, src))
1651                                 continue;
1652
1653                         if (!hlist_unhashed(&p->mglist) &&
1654                             (timer_pending(&p->timer) ?
1655                              time_after(p->timer.expires, time) :
1656                              try_to_del_timer_sync(&p->timer) >= 0)) {
1657                                 mod_timer(&p->timer, time);
1658                         }
1659
1660                         break;
1661                 }
1662         }
1663
1664         now = jiffies;
1665         time = now + br->multicast_last_member_count *
1666                      br->multicast_last_member_interval;
1667
1668         if (!port) {
1669                 if (mp->host_joined &&
1670                     (timer_pending(&mp->timer) ?
1671                      time_after(mp->timer.expires, time) :
1672                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1673                         mod_timer(&mp->timer, time);
1674                 }
1675
1676                 goto out;
1677         }
1678
1679         for (p = mlock_dereference(mp->ports, br);
1680              p != NULL;
1681              p = mlock_dereference(p->next, br)) {
1682                 if (p->port != port)
1683                         continue;
1684
1685                 if (!hlist_unhashed(&p->mglist) &&
1686                     (timer_pending(&p->timer) ?
1687                      time_after(p->timer.expires, time) :
1688                      try_to_del_timer_sync(&p->timer) >= 0)) {
1689                         mod_timer(&p->timer, time);
1690                 }
1691
1692                 break;
1693         }
1694 out:
1695         spin_unlock(&br->multicast_lock);
1696 }
1697
1698 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1699                                          struct net_bridge_port *port,
1700                                          __be32 group,
1701                                          __u16 vid,
1702                                          const unsigned char *src)
1703 {
1704         struct br_ip br_group;
1705         struct bridge_mcast_own_query *own_query;
1706
1707         if (ipv4_is_local_multicast(group))
1708                 return;
1709
1710         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1711
1712         br_group.u.ip4 = group;
1713         br_group.proto = htons(ETH_P_IP);
1714         br_group.vid = vid;
1715
1716         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1717                                  own_query, src);
1718 }
1719
1720 #if IS_ENABLED(CONFIG_IPV6)
1721 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1722                                          struct net_bridge_port *port,
1723                                          const struct in6_addr *group,
1724                                          __u16 vid,
1725                                          const unsigned char *src)
1726 {
1727         struct br_ip br_group;
1728         struct bridge_mcast_own_query *own_query;
1729
1730         if (ipv6_addr_is_ll_all_nodes(group))
1731                 return;
1732
1733         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1734
1735         br_group.u.ip6 = *group;
1736         br_group.proto = htons(ETH_P_IPV6);
1737         br_group.vid = vid;
1738
1739         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1740                                  own_query, src);
1741 }
1742 #endif
1743
1744 static void br_multicast_err_count(const struct net_bridge *br,
1745                                    const struct net_bridge_port *p,
1746                                    __be16 proto)
1747 {
1748         struct bridge_mcast_stats __percpu *stats;
1749         struct bridge_mcast_stats *pstats;
1750
1751         if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1752                 return;
1753
1754         if (p)
1755                 stats = p->mcast_stats;
1756         else
1757                 stats = br->mcast_stats;
1758         if (WARN_ON(!stats))
1759                 return;
1760
1761         pstats = this_cpu_ptr(stats);
1762
1763         u64_stats_update_begin(&pstats->syncp);
1764         switch (proto) {
1765         case htons(ETH_P_IP):
1766                 pstats->mstats.igmp_parse_errors++;
1767                 break;
1768 #if IS_ENABLED(CONFIG_IPV6)
1769         case htons(ETH_P_IPV6):
1770                 pstats->mstats.mld_parse_errors++;
1771                 break;
1772 #endif
1773         }
1774         u64_stats_update_end(&pstats->syncp);
1775 }
1776
1777 static void br_multicast_pim(struct net_bridge *br,
1778                              struct net_bridge_port *port,
1779                              const struct sk_buff *skb)
1780 {
1781         unsigned int offset = skb_transport_offset(skb);
1782         struct pimhdr *pimhdr, _pimhdr;
1783
1784         pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1785         if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1786             pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1787                 return;
1788
1789         br_multicast_mark_router(br, port);
1790 }
1791
1792 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1793                                  struct net_bridge_port *port,
1794                                  struct sk_buff *skb,
1795                                  u16 vid)
1796 {
1797         struct sk_buff *skb_trimmed = NULL;
1798         const unsigned char *src;
1799         struct igmphdr *ih;
1800         int err;
1801
1802         err = ip_mc_check_igmp(skb, &skb_trimmed);
1803
1804         if (err == -ENOMSG) {
1805                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1806                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1807                 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1808                         if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1809                                 br_multicast_pim(br, port, skb);
1810                 }
1811                 return 0;
1812         } else if (err < 0) {
1813                 br_multicast_err_count(br, port, skb->protocol);
1814                 return err;
1815         }
1816
1817         ih = igmp_hdr(skb);
1818         src = eth_hdr(skb)->h_source;
1819         BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1820
1821         switch (ih->type) {
1822         case IGMP_HOST_MEMBERSHIP_REPORT:
1823         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1824                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1825                 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1826                 break;
1827         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1828                 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1829                 break;
1830         case IGMP_HOST_MEMBERSHIP_QUERY:
1831                 br_ip4_multicast_query(br, port, skb_trimmed, vid);
1832                 break;
1833         case IGMP_HOST_LEAVE_MESSAGE:
1834                 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1835                 break;
1836         }
1837
1838         if (skb_trimmed && skb_trimmed != skb)
1839                 kfree_skb(skb_trimmed);
1840
1841         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1842                            BR_MCAST_DIR_RX);
1843
1844         return err;
1845 }
1846
1847 #if IS_ENABLED(CONFIG_IPV6)
1848 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1849                                  struct net_bridge_port *port,
1850                                  struct sk_buff *skb,
1851                                  u16 vid)
1852 {
1853         struct sk_buff *skb_trimmed = NULL;
1854         const unsigned char *src;
1855         struct mld_msg *mld;
1856         int err;
1857
1858         err = ipv6_mc_check_mld(skb, &skb_trimmed);
1859
1860         if (err == -ENOMSG) {
1861                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1862                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1863                 return 0;
1864         } else if (err < 0) {
1865                 br_multicast_err_count(br, port, skb->protocol);
1866                 return err;
1867         }
1868
1869         mld = (struct mld_msg *)skb_transport_header(skb);
1870         BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1871
1872         switch (mld->mld_type) {
1873         case ICMPV6_MGM_REPORT:
1874                 src = eth_hdr(skb)->h_source;
1875                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1876                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1877                                                  src);
1878                 break;
1879         case ICMPV6_MLD2_REPORT:
1880                 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1881                 break;
1882         case ICMPV6_MGM_QUERY:
1883                 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1884                 break;
1885         case ICMPV6_MGM_REDUCTION:
1886                 src = eth_hdr(skb)->h_source;
1887                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1888                 break;
1889         }
1890
1891         if (skb_trimmed && skb_trimmed != skb)
1892                 kfree_skb(skb_trimmed);
1893
1894         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1895                            BR_MCAST_DIR_RX);
1896
1897         return err;
1898 }
1899 #endif
1900
1901 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1902                      struct sk_buff *skb, u16 vid)
1903 {
1904         int ret = 0;
1905
1906         BR_INPUT_SKB_CB(skb)->igmp = 0;
1907         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1908
1909         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1910                 return 0;
1911
1912         switch (skb->protocol) {
1913         case htons(ETH_P_IP):
1914                 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1915                 break;
1916 #if IS_ENABLED(CONFIG_IPV6)
1917         case htons(ETH_P_IPV6):
1918                 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1919                 break;
1920 #endif
1921         }
1922
1923         return ret;
1924 }
1925
1926 static void br_multicast_query_expired(struct net_bridge *br,
1927                                        struct bridge_mcast_own_query *query,
1928                                        struct bridge_mcast_querier *querier)
1929 {
1930         spin_lock(&br->multicast_lock);
1931         if (query->startup_sent < br->multicast_startup_query_count)
1932                 query->startup_sent++;
1933
1934         RCU_INIT_POINTER(querier->port, NULL);
1935         br_multicast_send_query(br, NULL, query);
1936         spin_unlock(&br->multicast_lock);
1937 }
1938
1939 static void br_ip4_multicast_query_expired(struct timer_list *t)
1940 {
1941         struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
1942
1943         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1944 }
1945
1946 #if IS_ENABLED(CONFIG_IPV6)
1947 static void br_ip6_multicast_query_expired(struct timer_list *t)
1948 {
1949         struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
1950
1951         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1952 }
1953 #endif
1954
1955 void br_multicast_init(struct net_bridge *br)
1956 {
1957         br->hash_elasticity = 4;
1958         br->hash_max = 512;
1959
1960         br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1961         br->multicast_last_member_count = 2;
1962         br->multicast_startup_query_count = 2;
1963
1964         br->multicast_last_member_interval = HZ;
1965         br->multicast_query_response_interval = 10 * HZ;
1966         br->multicast_startup_query_interval = 125 * HZ / 4;
1967         br->multicast_query_interval = 125 * HZ;
1968         br->multicast_querier_interval = 255 * HZ;
1969         br->multicast_membership_interval = 260 * HZ;
1970
1971         br->ip4_other_query.delay_time = 0;
1972         br->ip4_querier.port = NULL;
1973         br->multicast_igmp_version = 2;
1974 #if IS_ENABLED(CONFIG_IPV6)
1975         br->multicast_mld_version = 1;
1976         br->ip6_other_query.delay_time = 0;
1977         br->ip6_querier.port = NULL;
1978 #endif
1979         br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
1980         br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
1981
1982         spin_lock_init(&br->multicast_lock);
1983         timer_setup(&br->multicast_router_timer,
1984                     br_multicast_local_router_expired, 0);
1985         timer_setup(&br->ip4_other_query.timer,
1986                     br_ip4_multicast_querier_expired, 0);
1987         timer_setup(&br->ip4_own_query.timer,
1988                     br_ip4_multicast_query_expired, 0);
1989 #if IS_ENABLED(CONFIG_IPV6)
1990         timer_setup(&br->ip6_other_query.timer,
1991                     br_ip6_multicast_querier_expired, 0);
1992         timer_setup(&br->ip6_own_query.timer,
1993                     br_ip6_multicast_query_expired, 0);
1994 #endif
1995 }
1996
1997 static void __br_multicast_open(struct net_bridge *br,
1998                                 struct bridge_mcast_own_query *query)
1999 {
2000         query->startup_sent = 0;
2001
2002         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
2003                 return;
2004
2005         mod_timer(&query->timer, jiffies);
2006 }
2007
2008 void br_multicast_open(struct net_bridge *br)
2009 {
2010         __br_multicast_open(br, &br->ip4_own_query);
2011 #if IS_ENABLED(CONFIG_IPV6)
2012         __br_multicast_open(br, &br->ip6_own_query);
2013 #endif
2014 }
2015
2016 void br_multicast_stop(struct net_bridge *br)
2017 {
2018         del_timer_sync(&br->multicast_router_timer);
2019         del_timer_sync(&br->ip4_other_query.timer);
2020         del_timer_sync(&br->ip4_own_query.timer);
2021 #if IS_ENABLED(CONFIG_IPV6)
2022         del_timer_sync(&br->ip6_other_query.timer);
2023         del_timer_sync(&br->ip6_own_query.timer);
2024 #endif
2025 }
2026
2027 void br_multicast_dev_del(struct net_bridge *br)
2028 {
2029         struct net_bridge_mdb_htable *mdb;
2030         struct net_bridge_mdb_entry *mp;
2031         struct hlist_node *n;
2032         u32 ver;
2033         int i;
2034
2035         spin_lock_bh(&br->multicast_lock);
2036         mdb = mlock_dereference(br->mdb, br);
2037         if (!mdb)
2038                 goto out;
2039
2040         br->mdb = NULL;
2041
2042         ver = mdb->ver;
2043         for (i = 0; i < mdb->max; i++) {
2044                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
2045                                           hlist[ver]) {
2046                         del_timer(&mp->timer);
2047                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
2048                 }
2049         }
2050
2051         if (mdb->old) {
2052                 spin_unlock_bh(&br->multicast_lock);
2053                 rcu_barrier_bh();
2054                 spin_lock_bh(&br->multicast_lock);
2055                 WARN_ON(mdb->old);
2056         }
2057
2058         mdb->old = mdb;
2059         call_rcu_bh(&mdb->rcu, br_mdb_free);
2060
2061 out:
2062         spin_unlock_bh(&br->multicast_lock);
2063 }
2064
2065 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
2066 {
2067         int err = -EINVAL;
2068
2069         spin_lock_bh(&br->multicast_lock);
2070
2071         switch (val) {
2072         case MDB_RTR_TYPE_DISABLED:
2073         case MDB_RTR_TYPE_PERM:
2074                 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
2075                 del_timer(&br->multicast_router_timer);
2076                 br->multicast_router = val;
2077                 err = 0;
2078                 break;
2079         case MDB_RTR_TYPE_TEMP_QUERY:
2080                 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
2081                         br_mc_router_state_change(br, false);
2082                 br->multicast_router = val;
2083                 err = 0;
2084                 break;
2085         }
2086
2087         spin_unlock_bh(&br->multicast_lock);
2088
2089         return err;
2090 }
2091
2092 static void __del_port_router(struct net_bridge_port *p)
2093 {
2094         if (hlist_unhashed(&p->rlist))
2095                 return;
2096         hlist_del_init_rcu(&p->rlist);
2097         br_rtr_notify(p->br->dev, p, RTM_DELMDB);
2098         br_port_mc_router_state_change(p, false);
2099
2100         /* don't allow timer refresh */
2101         if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2102                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2103 }
2104
2105 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
2106 {
2107         struct net_bridge *br = p->br;
2108         unsigned long now = jiffies;
2109         int err = -EINVAL;
2110
2111         spin_lock(&br->multicast_lock);
2112         if (p->multicast_router == val) {
2113                 /* Refresh the temp router port timer */
2114                 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2115                         mod_timer(&p->multicast_router_timer,
2116                                   now + br->multicast_querier_interval);
2117                 err = 0;
2118                 goto unlock;
2119         }
2120         switch (val) {
2121         case MDB_RTR_TYPE_DISABLED:
2122                 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2123                 __del_port_router(p);
2124                 del_timer(&p->multicast_router_timer);
2125                 break;
2126         case MDB_RTR_TYPE_TEMP_QUERY:
2127                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2128                 __del_port_router(p);
2129                 break;
2130         case MDB_RTR_TYPE_PERM:
2131                 p->multicast_router = MDB_RTR_TYPE_PERM;
2132                 del_timer(&p->multicast_router_timer);
2133                 br_multicast_add_router(br, p);
2134                 break;
2135         case MDB_RTR_TYPE_TEMP:
2136                 p->multicast_router = MDB_RTR_TYPE_TEMP;
2137                 br_multicast_mark_router(br, p);
2138                 break;
2139         default:
2140                 goto unlock;
2141         }
2142         err = 0;
2143 unlock:
2144         spin_unlock(&br->multicast_lock);
2145
2146         return err;
2147 }
2148
2149 static void br_multicast_start_querier(struct net_bridge *br,
2150                                        struct bridge_mcast_own_query *query)
2151 {
2152         struct net_bridge_port *port;
2153
2154         __br_multicast_open(br, query);
2155
2156         list_for_each_entry(port, &br->port_list, list) {
2157                 if (port->state == BR_STATE_DISABLED ||
2158                     port->state == BR_STATE_BLOCKING)
2159                         continue;
2160
2161                 if (query == &br->ip4_own_query)
2162                         br_multicast_enable(&port->ip4_own_query);
2163 #if IS_ENABLED(CONFIG_IPV6)
2164                 else
2165                         br_multicast_enable(&port->ip6_own_query);
2166 #endif
2167         }
2168 }
2169
2170 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2171 {
2172         struct net_bridge_mdb_htable *mdb;
2173         struct net_bridge_port *port;
2174         int err = 0;
2175
2176         spin_lock_bh(&br->multicast_lock);
2177         if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
2178                 goto unlock;
2179
2180         br_mc_disabled_update(br->dev, val);
2181         br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
2182         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
2183                 goto unlock;
2184
2185         if (!netif_running(br->dev))
2186                 goto unlock;
2187
2188         mdb = mlock_dereference(br->mdb, br);
2189         if (mdb) {
2190                 if (mdb->old) {
2191                         err = -EEXIST;
2192 rollback:
2193                         br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
2194                         goto unlock;
2195                 }
2196
2197                 err = br_mdb_rehash(&br->mdb, mdb->max,
2198                                     br->hash_elasticity);
2199                 if (err)
2200                         goto rollback;
2201         }
2202
2203         br_multicast_open(br);
2204         list_for_each_entry(port, &br->port_list, list)
2205                 __br_multicast_enable_port(port);
2206
2207 unlock:
2208         spin_unlock_bh(&br->multicast_lock);
2209
2210         return err;
2211 }
2212
2213 bool br_multicast_enabled(const struct net_device *dev)
2214 {
2215         struct net_bridge *br = netdev_priv(dev);
2216
2217         return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
2218 }
2219 EXPORT_SYMBOL_GPL(br_multicast_enabled);
2220
2221 bool br_multicast_router(const struct net_device *dev)
2222 {
2223         struct net_bridge *br = netdev_priv(dev);
2224         bool is_router;
2225
2226         spin_lock_bh(&br->multicast_lock);
2227         is_router = br_multicast_is_router(br);
2228         spin_unlock_bh(&br->multicast_lock);
2229         return is_router;
2230 }
2231 EXPORT_SYMBOL_GPL(br_multicast_router);
2232
2233 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2234 {
2235         unsigned long max_delay;
2236
2237         val = !!val;
2238
2239         spin_lock_bh(&br->multicast_lock);
2240         if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
2241                 goto unlock;
2242
2243         br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
2244         if (!val)
2245                 goto unlock;
2246
2247         max_delay = br->multicast_query_response_interval;
2248
2249         if (!timer_pending(&br->ip4_other_query.timer))
2250                 br->ip4_other_query.delay_time = jiffies + max_delay;
2251
2252         br_multicast_start_querier(br, &br->ip4_own_query);
2253
2254 #if IS_ENABLED(CONFIG_IPV6)
2255         if (!timer_pending(&br->ip6_other_query.timer))
2256                 br->ip6_other_query.delay_time = jiffies + max_delay;
2257
2258         br_multicast_start_querier(br, &br->ip6_own_query);
2259 #endif
2260
2261 unlock:
2262         spin_unlock_bh(&br->multicast_lock);
2263
2264         return 0;
2265 }
2266
2267 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2268 {
2269         int err = -EINVAL;
2270         u32 old;
2271         struct net_bridge_mdb_htable *mdb;
2272
2273         spin_lock_bh(&br->multicast_lock);
2274         if (!is_power_of_2(val))
2275                 goto unlock;
2276
2277         mdb = mlock_dereference(br->mdb, br);
2278         if (mdb && val < mdb->size)
2279                 goto unlock;
2280
2281         err = 0;
2282
2283         old = br->hash_max;
2284         br->hash_max = val;
2285
2286         if (mdb) {
2287                 if (mdb->old) {
2288                         err = -EEXIST;
2289 rollback:
2290                         br->hash_max = old;
2291                         goto unlock;
2292                 }
2293
2294                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2295                                     br->hash_elasticity);
2296                 if (err)
2297                         goto rollback;
2298         }
2299
2300 unlock:
2301         spin_unlock_bh(&br->multicast_lock);
2302
2303         return err;
2304 }
2305
2306 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2307 {
2308         /* Currently we support only version 2 and 3 */
2309         switch (val) {
2310         case 2:
2311         case 3:
2312                 break;
2313         default:
2314                 return -EINVAL;
2315         }
2316
2317         spin_lock_bh(&br->multicast_lock);
2318         br->multicast_igmp_version = val;
2319         spin_unlock_bh(&br->multicast_lock);
2320
2321         return 0;
2322 }
2323
2324 #if IS_ENABLED(CONFIG_IPV6)
2325 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2326 {
2327         /* Currently we support version 1 and 2 */
2328         switch (val) {
2329         case 1:
2330         case 2:
2331                 break;
2332         default:
2333                 return -EINVAL;
2334         }
2335
2336         spin_lock_bh(&br->multicast_lock);
2337         br->multicast_mld_version = val;
2338         spin_unlock_bh(&br->multicast_lock);
2339
2340         return 0;
2341 }
2342 #endif
2343
2344 /**
2345  * br_multicast_list_adjacent - Returns snooped multicast addresses
2346  * @dev:        The bridge port adjacent to which to retrieve addresses
2347  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2348  *
2349  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2350  * snooping feature on all bridge ports of dev's bridge device, excluding
2351  * the addresses from dev itself.
2352  *
2353  * Returns the number of items added to br_ip_list.
2354  *
2355  * Notes:
2356  * - br_ip_list needs to be initialized by caller
2357  * - br_ip_list might contain duplicates in the end
2358  *   (needs to be taken care of by caller)
2359  * - br_ip_list needs to be freed by caller
2360  */
2361 int br_multicast_list_adjacent(struct net_device *dev,
2362                                struct list_head *br_ip_list)
2363 {
2364         struct net_bridge *br;
2365         struct net_bridge_port *port;
2366         struct net_bridge_port_group *group;
2367         struct br_ip_list *entry;
2368         int count = 0;
2369
2370         rcu_read_lock();
2371         if (!br_ip_list || !br_port_exists(dev))
2372                 goto unlock;
2373
2374         port = br_port_get_rcu(dev);
2375         if (!port || !port->br)
2376                 goto unlock;
2377
2378         br = port->br;
2379
2380         list_for_each_entry_rcu(port, &br->port_list, list) {
2381                 if (!port->dev || port->dev == dev)
2382                         continue;
2383
2384                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2385                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2386                         if (!entry)
2387                                 goto unlock;
2388
2389                         entry->addr = group->addr;
2390                         list_add(&entry->list, br_ip_list);
2391                         count++;
2392                 }
2393         }
2394
2395 unlock:
2396         rcu_read_unlock();
2397         return count;
2398 }
2399 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2400
2401 /**
2402  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2403  * @dev: The bridge port providing the bridge on which to check for a querier
2404  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2405  *
2406  * Checks whether the given interface has a bridge on top and if so returns
2407  * true if a valid querier exists anywhere on the bridged link layer.
2408  * Otherwise returns false.
2409  */
2410 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2411 {
2412         struct net_bridge *br;
2413         struct net_bridge_port *port;
2414         struct ethhdr eth;
2415         bool ret = false;
2416
2417         rcu_read_lock();
2418         if (!br_port_exists(dev))
2419                 goto unlock;
2420
2421         port = br_port_get_rcu(dev);
2422         if (!port || !port->br)
2423                 goto unlock;
2424
2425         br = port->br;
2426
2427         memset(&eth, 0, sizeof(eth));
2428         eth.h_proto = htons(proto);
2429
2430         ret = br_multicast_querier_exists(br, &eth);
2431
2432 unlock:
2433         rcu_read_unlock();
2434         return ret;
2435 }
2436 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2437
2438 /**
2439  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2440  * @dev: The bridge port adjacent to which to check for a querier
2441  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2442  *
2443  * Checks whether the given interface has a bridge on top and if so returns
2444  * true if a selected querier is behind one of the other ports of this
2445  * bridge. Otherwise returns false.
2446  */
2447 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2448 {
2449         struct net_bridge *br;
2450         struct net_bridge_port *port;
2451         bool ret = false;
2452
2453         rcu_read_lock();
2454         if (!br_port_exists(dev))
2455                 goto unlock;
2456
2457         port = br_port_get_rcu(dev);
2458         if (!port || !port->br)
2459                 goto unlock;
2460
2461         br = port->br;
2462
2463         switch (proto) {
2464         case ETH_P_IP:
2465                 if (!timer_pending(&br->ip4_other_query.timer) ||
2466                     rcu_dereference(br->ip4_querier.port) == port)
2467                         goto unlock;
2468                 break;
2469 #if IS_ENABLED(CONFIG_IPV6)
2470         case ETH_P_IPV6:
2471                 if (!timer_pending(&br->ip6_other_query.timer) ||
2472                     rcu_dereference(br->ip6_querier.port) == port)
2473                         goto unlock;
2474                 break;
2475 #endif
2476         default:
2477                 goto unlock;
2478         }
2479
2480         ret = true;
2481 unlock:
2482         rcu_read_unlock();
2483         return ret;
2484 }
2485 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2486
2487 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2488                                const struct sk_buff *skb, u8 type, u8 dir)
2489 {
2490         struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2491         __be16 proto = skb->protocol;
2492         unsigned int t_len;
2493
2494         u64_stats_update_begin(&pstats->syncp);
2495         switch (proto) {
2496         case htons(ETH_P_IP):
2497                 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2498                 switch (type) {
2499                 case IGMP_HOST_MEMBERSHIP_REPORT:
2500                         pstats->mstats.igmp_v1reports[dir]++;
2501                         break;
2502                 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2503                         pstats->mstats.igmp_v2reports[dir]++;
2504                         break;
2505                 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2506                         pstats->mstats.igmp_v3reports[dir]++;
2507                         break;
2508                 case IGMP_HOST_MEMBERSHIP_QUERY:
2509                         if (t_len != sizeof(struct igmphdr)) {
2510                                 pstats->mstats.igmp_v3queries[dir]++;
2511                         } else {
2512                                 unsigned int offset = skb_transport_offset(skb);
2513                                 struct igmphdr *ih, _ihdr;
2514
2515                                 ih = skb_header_pointer(skb, offset,
2516                                                         sizeof(_ihdr), &_ihdr);
2517                                 if (!ih)
2518                                         break;
2519                                 if (!ih->code)
2520                                         pstats->mstats.igmp_v1queries[dir]++;
2521                                 else
2522                                         pstats->mstats.igmp_v2queries[dir]++;
2523                         }
2524                         break;
2525                 case IGMP_HOST_LEAVE_MESSAGE:
2526                         pstats->mstats.igmp_leaves[dir]++;
2527                         break;
2528                 }
2529                 break;
2530 #if IS_ENABLED(CONFIG_IPV6)
2531         case htons(ETH_P_IPV6):
2532                 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2533                         sizeof(struct ipv6hdr);
2534                 t_len -= skb_network_header_len(skb);
2535                 switch (type) {
2536                 case ICMPV6_MGM_REPORT:
2537                         pstats->mstats.mld_v1reports[dir]++;
2538                         break;
2539                 case ICMPV6_MLD2_REPORT:
2540                         pstats->mstats.mld_v2reports[dir]++;
2541                         break;
2542                 case ICMPV6_MGM_QUERY:
2543                         if (t_len != sizeof(struct mld_msg))
2544                                 pstats->mstats.mld_v2queries[dir]++;
2545                         else
2546                                 pstats->mstats.mld_v1queries[dir]++;
2547                         break;
2548                 case ICMPV6_MGM_REDUCTION:
2549                         pstats->mstats.mld_leaves[dir]++;
2550                         break;
2551                 }
2552                 break;
2553 #endif /* CONFIG_IPV6 */
2554         }
2555         u64_stats_update_end(&pstats->syncp);
2556 }
2557
2558 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2559                         const struct sk_buff *skb, u8 type, u8 dir)
2560 {
2561         struct bridge_mcast_stats __percpu *stats;
2562
2563         /* if multicast_disabled is true then igmp type can't be set */
2564         if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
2565                 return;
2566
2567         if (p)
2568                 stats = p->mcast_stats;
2569         else
2570                 stats = br->mcast_stats;
2571         if (WARN_ON(!stats))
2572                 return;
2573
2574         br_mcast_stats_add(stats, skb, type, dir);
2575 }
2576
2577 int br_multicast_init_stats(struct net_bridge *br)
2578 {
2579         br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2580         if (!br->mcast_stats)
2581                 return -ENOMEM;
2582
2583         return 0;
2584 }
2585
2586 void br_multicast_uninit_stats(struct net_bridge *br)
2587 {
2588         free_percpu(br->mcast_stats);
2589 }
2590
2591 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2592 {
2593         dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2594         dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2595 }
2596
2597 void br_multicast_get_stats(const struct net_bridge *br,
2598                             const struct net_bridge_port *p,
2599                             struct br_mcast_stats *dest)
2600 {
2601         struct bridge_mcast_stats __percpu *stats;
2602         struct br_mcast_stats tdst;
2603         int i;
2604
2605         memset(dest, 0, sizeof(*dest));
2606         if (p)
2607                 stats = p->mcast_stats;
2608         else
2609                 stats = br->mcast_stats;
2610         if (WARN_ON(!stats))
2611                 return;
2612
2613         memset(&tdst, 0, sizeof(tdst));
2614         for_each_possible_cpu(i) {
2615                 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2616                 struct br_mcast_stats temp;
2617                 unsigned int start;
2618
2619                 do {
2620                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2621                         memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2622                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2623
2624                 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2625                 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2626                 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2627                 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2628                 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2629                 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2630                 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2631                 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2632
2633                 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2634                 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2635                 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2636                 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2637                 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2638                 tdst.mld_parse_errors += temp.mld_parse_errors;
2639         }
2640         memcpy(dest, &tdst, sizeof(*dest));
2641 }