git.rot13.org Git - linux/blob - 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
1426         /* Based on RFC4541, section 2.1.1 IGMP Forwarding Rules,
1427          * the arrival port for IGMP Queries where the source address
1428          * is 0.0.0.0 should not be added to router port list.
1429          */
1430         if ((saddr->proto == htons(ETH_P_IP) && saddr->u.ip4) ||
1431             saddr->proto == htons(ETH_P_IPV6))
1432                 br_multicast_mark_router(br, port);
1433 }
1434
1435 static void br_ip4_multicast_query(struct net_bridge *br,
1436                                    struct net_bridge_port *port,
1437                                    struct sk_buff *skb,
1438                                    u16 vid)
1439 {
1440         const struct iphdr *iph = ip_hdr(skb);
1441         struct igmphdr *ih = igmp_hdr(skb);
1442         struct net_bridge_mdb_entry *mp;
1443         struct igmpv3_query *ih3;
1444         struct net_bridge_port_group *p;
1445         struct net_bridge_port_group __rcu **pp;
1446         struct br_ip saddr;
1447         unsigned long max_delay;
1448         unsigned long now = jiffies;
1449         unsigned int offset = skb_transport_offset(skb);
1450         __be32 group;
1451
1452         spin_lock(&br->multicast_lock);
1453         if (!netif_running(br->dev) ||
1454             (port && port->state == BR_STATE_DISABLED))
1455                 goto out;
1456
1457         group = ih->group;
1458
1459         if (skb->len == offset + sizeof(*ih)) {
1460                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1461
1462                 if (!max_delay) {
1463                         max_delay = 10 * HZ;
1464                         group = 0;
1465                 }
1466         } else if (skb->len >= offset + sizeof(*ih3)) {
1467                 ih3 = igmpv3_query_hdr(skb);
1468                 if (ih3->nsrcs)
1469                         goto out;
1470
1471                 max_delay = ih3->code ?
1472                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1473         } else {
1474                 goto out;
1475         }
1476
1477         if (!group) {
1478                 saddr.proto = htons(ETH_P_IP);
1479                 saddr.u.ip4 = iph->saddr;
1480
1481                 br_multicast_query_received(br, port, &br->ip4_other_query,
1482                                             &saddr, max_delay);
1483                 goto out;
1484         }
1485
1486         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1487         if (!mp)
1488                 goto out;
1489
1490         max_delay *= br->multicast_last_member_count;
1491
1492         if (mp->host_joined &&
1493             (timer_pending(&mp->timer) ?
1494              time_after(mp->timer.expires, now + max_delay) :
1495              try_to_del_timer_sync(&mp->timer) >= 0))
1496                 mod_timer(&mp->timer, now + max_delay);
1497
1498         for (pp = &mp->ports;
1499              (p = mlock_dereference(*pp, br)) != NULL;
1500              pp = &p->next) {
1501                 if (timer_pending(&p->timer) ?
1502                     time_after(p->timer.expires, now + max_delay) :
1503                     try_to_del_timer_sync(&p->timer) >= 0)
1504                         mod_timer(&p->timer, now + max_delay);
1505         }
1506
1507 out:
1508         spin_unlock(&br->multicast_lock);
1509 }
1510
1511 #if IS_ENABLED(CONFIG_IPV6)
1512 static int br_ip6_multicast_query(struct net_bridge *br,
1513                                   struct net_bridge_port *port,
1514                                   struct sk_buff *skb,
1515                                   u16 vid)
1516 {
1517         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1518         struct mld_msg *mld;
1519         struct net_bridge_mdb_entry *mp;
1520         struct mld2_query *mld2q;
1521         struct net_bridge_port_group *p;
1522         struct net_bridge_port_group __rcu **pp;
1523         struct br_ip saddr;
1524         unsigned long max_delay;
1525         unsigned long now = jiffies;
1526         unsigned int offset = skb_transport_offset(skb);
1527         const struct in6_addr *group = NULL;
1528         bool is_general_query;
1529         int err = 0;
1530
1531         spin_lock(&br->multicast_lock);
1532         if (!netif_running(br->dev) ||
1533             (port && port->state == BR_STATE_DISABLED))
1534                 goto out;
1535
1536         if (skb->len == offset + sizeof(*mld)) {
1537                 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1538                         err = -EINVAL;
1539                         goto out;
1540                 }
1541                 mld = (struct mld_msg *) icmp6_hdr(skb);
1542                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1543                 if (max_delay)
1544                         group = &mld->mld_mca;
1545         } else {
1546                 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1547                         err = -EINVAL;
1548                         goto out;
1549                 }
1550                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1551                 if (!mld2q->mld2q_nsrcs)
1552                         group = &mld2q->mld2q_mca;
1553
1554                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1555         }
1556
1557         is_general_query = group && ipv6_addr_any(group);
1558
1559         if (is_general_query) {
1560                 saddr.proto = htons(ETH_P_IPV6);
1561                 saddr.u.ip6 = ip6h->saddr;
1562
1563                 br_multicast_query_received(br, port, &br->ip6_other_query,
1564                                             &saddr, max_delay);
1565                 goto out;
1566         } else if (!group) {
1567                 goto out;
1568         }
1569
1570         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1571         if (!mp)
1572                 goto out;
1573
1574         max_delay *= br->multicast_last_member_count;
1575         if (mp->host_joined &&
1576             (timer_pending(&mp->timer) ?
1577              time_after(mp->timer.expires, now + max_delay) :
1578              try_to_del_timer_sync(&mp->timer) >= 0))
1579                 mod_timer(&mp->timer, now + max_delay);
1580
1581         for (pp = &mp->ports;
1582              (p = mlock_dereference(*pp, br)) != NULL;
1583              pp = &p->next) {
1584                 if (timer_pending(&p->timer) ?
1585                     time_after(p->timer.expires, now + max_delay) :
1586                     try_to_del_timer_sync(&p->timer) >= 0)
1587                         mod_timer(&p->timer, now + max_delay);
1588         }
1589
1590 out:
1591         spin_unlock(&br->multicast_lock);
1592         return err;
1593 }
1594 #endif
1595
1596 static void
1597 br_multicast_leave_group(struct net_bridge *br,
1598                          struct net_bridge_port *port,
1599                          struct br_ip *group,
1600                          struct bridge_mcast_other_query *other_query,
1601                          struct bridge_mcast_own_query *own_query,
1602                          const unsigned char *src)
1603 {
1604         struct net_bridge_mdb_htable *mdb;
1605         struct net_bridge_mdb_entry *mp;
1606         struct net_bridge_port_group *p;
1607         unsigned long now;
1608         unsigned long time;
1609
1610         spin_lock(&br->multicast_lock);
1611         if (!netif_running(br->dev) ||
1612             (port && port->state == BR_STATE_DISABLED))
1613                 goto out;
1614
1615         mdb = mlock_dereference(br->mdb, br);
1616         mp = br_mdb_ip_get(mdb, group);
1617         if (!mp)
1618                 goto out;
1619
1620         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1621                 struct net_bridge_port_group __rcu **pp;
1622
1623                 for (pp = &mp->ports;
1624                      (p = mlock_dereference(*pp, br)) != NULL;
1625                      pp = &p->next) {
1626                         if (!br_port_group_equal(p, port, src))
1627                                 continue;
1628
1629                         rcu_assign_pointer(*pp, p->next);
1630                         hlist_del_init(&p->mglist);
1631                         del_timer(&p->timer);
1632                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1633                         br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1634                                       p->flags);
1635
1636                         if (!mp->ports && !mp->host_joined &&
1637                             netif_running(br->dev))
1638                                 mod_timer(&mp->timer, jiffies);
1639                 }
1640                 goto out;
1641         }
1642
1643         if (timer_pending(&other_query->timer))
1644                 goto out;
1645
1646         if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
1647                 __br_multicast_send_query(br, port, &mp->addr);
1648
1649                 time = jiffies + br->multicast_last_member_count *
1650                                  br->multicast_last_member_interval;
1651
1652                 mod_timer(&own_query->timer, time);
1653
1654                 for (p = mlock_dereference(mp->ports, br);
1655                      p != NULL;
1656                      p = mlock_dereference(p->next, br)) {
1657                         if (!br_port_group_equal(p, port, src))
1658                                 continue;
1659
1660                         if (!hlist_unhashed(&p->mglist) &&
1661                             (timer_pending(&p->timer) ?
1662                              time_after(p->timer.expires, time) :
1663                              try_to_del_timer_sync(&p->timer) >= 0)) {
1664                                 mod_timer(&p->timer, time);
1665                         }
1666
1667                         break;
1668                 }
1669         }
1670
1671         now = jiffies;
1672         time = now + br->multicast_last_member_count *
1673                      br->multicast_last_member_interval;
1674
1675         if (!port) {
1676                 if (mp->host_joined &&
1677                     (timer_pending(&mp->timer) ?
1678                      time_after(mp->timer.expires, time) :
1679                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1680                         mod_timer(&mp->timer, time);
1681                 }
1682
1683                 goto out;
1684         }
1685
1686         for (p = mlock_dereference(mp->ports, br);
1687              p != NULL;
1688              p = mlock_dereference(p->next, br)) {
1689                 if (p->port != port)
1690                         continue;
1691
1692                 if (!hlist_unhashed(&p->mglist) &&
1693                     (timer_pending(&p->timer) ?
1694                      time_after(p->timer.expires, time) :
1695                      try_to_del_timer_sync(&p->timer) >= 0)) {
1696                         mod_timer(&p->timer, time);
1697                 }
1698
1699                 break;
1700         }
1701 out:
1702         spin_unlock(&br->multicast_lock);
1703 }
1704
1705 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1706                                          struct net_bridge_port *port,
1707                                          __be32 group,
1708                                          __u16 vid,
1709                                          const unsigned char *src)
1710 {
1711         struct br_ip br_group;
1712         struct bridge_mcast_own_query *own_query;
1713
1714         if (ipv4_is_local_multicast(group))
1715                 return;
1716
1717         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1718
1719         br_group.u.ip4 = group;
1720         br_group.proto = htons(ETH_P_IP);
1721         br_group.vid = vid;
1722
1723         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1724                                  own_query, src);
1725 }
1726
1727 #if IS_ENABLED(CONFIG_IPV6)
1728 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1729                                          struct net_bridge_port *port,
1730                                          const struct in6_addr *group,
1731                                          __u16 vid,
1732                                          const unsigned char *src)
1733 {
1734         struct br_ip br_group;
1735         struct bridge_mcast_own_query *own_query;
1736
1737         if (ipv6_addr_is_ll_all_nodes(group))
1738                 return;
1739
1740         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1741
1742         br_group.u.ip6 = *group;
1743         br_group.proto = htons(ETH_P_IPV6);
1744         br_group.vid = vid;
1745
1746         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1747                                  own_query, src);
1748 }
1749 #endif
1750
1751 static void br_multicast_err_count(const struct net_bridge *br,
1752                                    const struct net_bridge_port *p,
1753                                    __be16 proto)
1754 {
1755         struct bridge_mcast_stats __percpu *stats;
1756         struct bridge_mcast_stats *pstats;
1757
1758         if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1759                 return;
1760
1761         if (p)
1762                 stats = p->mcast_stats;
1763         else
1764                 stats = br->mcast_stats;
1765         if (WARN_ON(!stats))
1766                 return;
1767
1768         pstats = this_cpu_ptr(stats);
1769
1770         u64_stats_update_begin(&pstats->syncp);
1771         switch (proto) {
1772         case htons(ETH_P_IP):
1773                 pstats->mstats.igmp_parse_errors++;
1774                 break;
1775 #if IS_ENABLED(CONFIG_IPV6)
1776         case htons(ETH_P_IPV6):
1777                 pstats->mstats.mld_parse_errors++;
1778                 break;
1779 #endif
1780         }
1781         u64_stats_update_end(&pstats->syncp);
1782 }
1783
1784 static void br_multicast_pim(struct net_bridge *br,
1785                              struct net_bridge_port *port,
1786                              const struct sk_buff *skb)
1787 {
1788         unsigned int offset = skb_transport_offset(skb);
1789         struct pimhdr *pimhdr, _pimhdr;
1790
1791         pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1792         if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1793             pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1794                 return;
1795
1796         br_multicast_mark_router(br, port);
1797 }
1798
1799 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1800                                  struct net_bridge_port *port,
1801                                  struct sk_buff *skb,
1802                                  u16 vid)
1803 {
1804         struct sk_buff *skb_trimmed = NULL;
1805         const unsigned char *src;
1806         struct igmphdr *ih;
1807         int err;
1808
1809         err = ip_mc_check_igmp(skb, &skb_trimmed);
1810
1811         if (err == -ENOMSG) {
1812                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1813                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1814                 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1815                         if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1816                                 br_multicast_pim(br, port, skb);
1817                 }
1818                 return 0;
1819         } else if (err < 0) {
1820                 br_multicast_err_count(br, port, skb->protocol);
1821                 return err;
1822         }
1823
1824         ih = igmp_hdr(skb);
1825         src = eth_hdr(skb)->h_source;
1826         BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1827
1828         switch (ih->type) {
1829         case IGMP_HOST_MEMBERSHIP_REPORT:
1830         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1831                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1832                 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1833                 break;
1834         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1835                 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1836                 break;
1837         case IGMP_HOST_MEMBERSHIP_QUERY:
1838                 br_ip4_multicast_query(br, port, skb_trimmed, vid);
1839                 break;
1840         case IGMP_HOST_LEAVE_MESSAGE:
1841                 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1842                 break;
1843         }
1844
1845         if (skb_trimmed && skb_trimmed != skb)
1846                 kfree_skb(skb_trimmed);
1847
1848         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1849                            BR_MCAST_DIR_RX);
1850
1851         return err;
1852 }
1853
1854 #if IS_ENABLED(CONFIG_IPV6)
1855 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1856                                  struct net_bridge_port *port,
1857                                  struct sk_buff *skb,
1858                                  u16 vid)
1859 {
1860         struct sk_buff *skb_trimmed = NULL;
1861         const unsigned char *src;
1862         struct mld_msg *mld;
1863         int err;
1864
1865         err = ipv6_mc_check_mld(skb, &skb_trimmed);
1866
1867         if (err == -ENOMSG) {
1868                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1869                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1870                 return 0;
1871         } else if (err < 0) {
1872                 br_multicast_err_count(br, port, skb->protocol);
1873                 return err;
1874         }
1875
1876         mld = (struct mld_msg *)skb_transport_header(skb);
1877         BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1878
1879         switch (mld->mld_type) {
1880         case ICMPV6_MGM_REPORT:
1881                 src = eth_hdr(skb)->h_source;
1882                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1883                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1884                                                  src);
1885                 break;
1886         case ICMPV6_MLD2_REPORT:
1887                 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1888                 break;
1889         case ICMPV6_MGM_QUERY:
1890                 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1891                 break;
1892         case ICMPV6_MGM_REDUCTION:
1893                 src = eth_hdr(skb)->h_source;
1894                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1895                 break;
1896         }
1897
1898         if (skb_trimmed && skb_trimmed != skb)
1899                 kfree_skb(skb_trimmed);
1900
1901         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1902                            BR_MCAST_DIR_RX);
1903
1904         return err;
1905 }
1906 #endif
1907
1908 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1909                      struct sk_buff *skb, u16 vid)
1910 {
1911         int ret = 0;
1912
1913         BR_INPUT_SKB_CB(skb)->igmp = 0;
1914         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1915
1916         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1917                 return 0;
1918
1919         switch (skb->protocol) {
1920         case htons(ETH_P_IP):
1921                 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1922                 break;
1923 #if IS_ENABLED(CONFIG_IPV6)
1924         case htons(ETH_P_IPV6):
1925                 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1926                 break;
1927 #endif
1928         }
1929
1930         return ret;
1931 }
1932
1933 static void br_multicast_query_expired(struct net_bridge *br,
1934                                        struct bridge_mcast_own_query *query,
1935                                        struct bridge_mcast_querier *querier)
1936 {
1937         spin_lock(&br->multicast_lock);
1938         if (query->startup_sent < br->multicast_startup_query_count)
1939                 query->startup_sent++;
1940
1941         RCU_INIT_POINTER(querier->port, NULL);
1942         br_multicast_send_query(br, NULL, query);
1943         spin_unlock(&br->multicast_lock);
1944 }
1945
1946 static void br_ip4_multicast_query_expired(struct timer_list *t)
1947 {
1948         struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
1949
1950         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1951 }
1952
1953 #if IS_ENABLED(CONFIG_IPV6)
1954 static void br_ip6_multicast_query_expired(struct timer_list *t)
1955 {
1956         struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
1957
1958         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1959 }
1960 #endif
1961
1962 void br_multicast_init(struct net_bridge *br)
1963 {
1964         br->hash_elasticity = 4;
1965         br->hash_max = 512;
1966
1967         br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1968         br->multicast_last_member_count = 2;
1969         br->multicast_startup_query_count = 2;
1970
1971         br->multicast_last_member_interval = HZ;
1972         br->multicast_query_response_interval = 10 * HZ;
1973         br->multicast_startup_query_interval = 125 * HZ / 4;
1974         br->multicast_query_interval = 125 * HZ;
1975         br->multicast_querier_interval = 255 * HZ;
1976         br->multicast_membership_interval = 260 * HZ;
1977
1978         br->ip4_other_query.delay_time = 0;
1979         br->ip4_querier.port = NULL;
1980         br->multicast_igmp_version = 2;
1981 #if IS_ENABLED(CONFIG_IPV6)
1982         br->multicast_mld_version = 1;
1983         br->ip6_other_query.delay_time = 0;
1984         br->ip6_querier.port = NULL;
1985 #endif
1986         br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
1987         br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
1988
1989         spin_lock_init(&br->multicast_lock);
1990         timer_setup(&br->multicast_router_timer,
1991                     br_multicast_local_router_expired, 0);
1992         timer_setup(&br->ip4_other_query.timer,
1993                     br_ip4_multicast_querier_expired, 0);
1994         timer_setup(&br->ip4_own_query.timer,
1995                     br_ip4_multicast_query_expired, 0);
1996 #if IS_ENABLED(CONFIG_IPV6)
1997         timer_setup(&br->ip6_other_query.timer,
1998                     br_ip6_multicast_querier_expired, 0);
1999         timer_setup(&br->ip6_own_query.timer,
2000                     br_ip6_multicast_query_expired, 0);
2001 #endif
2002 }
2003
2004 static void __br_multicast_open(struct net_bridge *br,
2005                                 struct bridge_mcast_own_query *query)
2006 {
2007         query->startup_sent = 0;
2008
2009         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
2010                 return;
2011
2012         mod_timer(&query->timer, jiffies);
2013 }
2014
2015 void br_multicast_open(struct net_bridge *br)
2016 {
2017         __br_multicast_open(br, &br->ip4_own_query);
2018 #if IS_ENABLED(CONFIG_IPV6)
2019         __br_multicast_open(br, &br->ip6_own_query);
2020 #endif
2021 }
2022
2023 void br_multicast_stop(struct net_bridge *br)
2024 {
2025         del_timer_sync(&br->multicast_router_timer);
2026         del_timer_sync(&br->ip4_other_query.timer);
2027         del_timer_sync(&br->ip4_own_query.timer);
2028 #if IS_ENABLED(CONFIG_IPV6)
2029         del_timer_sync(&br->ip6_other_query.timer);
2030         del_timer_sync(&br->ip6_own_query.timer);
2031 #endif
2032 }
2033
2034 void br_multicast_dev_del(struct net_bridge *br)
2035 {
2036         struct net_bridge_mdb_htable *mdb;
2037         struct net_bridge_mdb_entry *mp;
2038         struct hlist_node *n;
2039         u32 ver;
2040         int i;
2041
2042         spin_lock_bh(&br->multicast_lock);
2043         mdb = mlock_dereference(br->mdb, br);
2044         if (!mdb)
2045                 goto out;
2046
2047         br->mdb = NULL;
2048
2049         ver = mdb->ver;
2050         for (i = 0; i < mdb->max; i++) {
2051                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
2052                                           hlist[ver]) {
2053                         del_timer(&mp->timer);
2054                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
2055                 }
2056         }
2057
2058         if (mdb->old) {
2059                 spin_unlock_bh(&br->multicast_lock);
2060                 rcu_barrier_bh();
2061                 spin_lock_bh(&br->multicast_lock);
2062                 WARN_ON(mdb->old);
2063         }
2064
2065         mdb->old = mdb;
2066         call_rcu_bh(&mdb->rcu, br_mdb_free);
2067
2068 out:
2069         spin_unlock_bh(&br->multicast_lock);
2070 }
2071
2072 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
2073 {
2074         int err = -EINVAL;
2075
2076         spin_lock_bh(&br->multicast_lock);
2077
2078         switch (val) {
2079         case MDB_RTR_TYPE_DISABLED:
2080         case MDB_RTR_TYPE_PERM:
2081                 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
2082                 del_timer(&br->multicast_router_timer);
2083                 br->multicast_router = val;
2084                 err = 0;
2085                 break;
2086         case MDB_RTR_TYPE_TEMP_QUERY:
2087                 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
2088                         br_mc_router_state_change(br, false);
2089                 br->multicast_router = val;
2090                 err = 0;
2091                 break;
2092         }
2093
2094         spin_unlock_bh(&br->multicast_lock);
2095
2096         return err;
2097 }
2098
2099 static void __del_port_router(struct net_bridge_port *p)
2100 {
2101         if (hlist_unhashed(&p->rlist))
2102                 return;
2103         hlist_del_init_rcu(&p->rlist);
2104         br_rtr_notify(p->br->dev, p, RTM_DELMDB);
2105         br_port_mc_router_state_change(p, false);
2106
2107         /* don't allow timer refresh */
2108         if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2109                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2110 }
2111
2112 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
2113 {
2114         struct net_bridge *br = p->br;
2115         unsigned long now = jiffies;
2116         int err = -EINVAL;
2117
2118         spin_lock(&br->multicast_lock);
2119         if (p->multicast_router == val) {
2120                 /* Refresh the temp router port timer */
2121                 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2122                         mod_timer(&p->multicast_router_timer,
2123                                   now + br->multicast_querier_interval);
2124                 err = 0;
2125                 goto unlock;
2126         }
2127         switch (val) {
2128         case MDB_RTR_TYPE_DISABLED:
2129                 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2130                 __del_port_router(p);
2131                 del_timer(&p->multicast_router_timer);
2132                 break;
2133         case MDB_RTR_TYPE_TEMP_QUERY:
2134                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2135                 __del_port_router(p);
2136                 break;
2137         case MDB_RTR_TYPE_PERM:
2138                 p->multicast_router = MDB_RTR_TYPE_PERM;
2139                 del_timer(&p->multicast_router_timer);
2140                 br_multicast_add_router(br, p);
2141                 break;
2142         case MDB_RTR_TYPE_TEMP:
2143                 p->multicast_router = MDB_RTR_TYPE_TEMP;
2144                 br_multicast_mark_router(br, p);
2145                 break;
2146         default:
2147                 goto unlock;
2148         }
2149         err = 0;
2150 unlock:
2151         spin_unlock(&br->multicast_lock);
2152
2153         return err;
2154 }
2155
2156 static void br_multicast_start_querier(struct net_bridge *br,
2157                                        struct bridge_mcast_own_query *query)
2158 {
2159         struct net_bridge_port *port;
2160
2161         __br_multicast_open(br, query);
2162
2163         list_for_each_entry(port, &br->port_list, list) {
2164                 if (port->state == BR_STATE_DISABLED ||
2165                     port->state == BR_STATE_BLOCKING)
2166                         continue;
2167
2168                 if (query == &br->ip4_own_query)
2169                         br_multicast_enable(&port->ip4_own_query);
2170 #if IS_ENABLED(CONFIG_IPV6)
2171                 else
2172                         br_multicast_enable(&port->ip6_own_query);
2173 #endif
2174         }
2175 }
2176
2177 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2178 {
2179         struct net_bridge_mdb_htable *mdb;
2180         struct net_bridge_port *port;
2181         int err = 0;
2182
2183         spin_lock_bh(&br->multicast_lock);
2184         if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
2185                 goto unlock;
2186
2187         br_mc_disabled_update(br->dev, val);
2188         br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
2189         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
2190                 goto unlock;
2191
2192         if (!netif_running(br->dev))
2193                 goto unlock;
2194
2195         mdb = mlock_dereference(br->mdb, br);
2196         if (mdb) {
2197                 if (mdb->old) {
2198                         err = -EEXIST;
2199 rollback:
2200                         br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
2201                         goto unlock;
2202                 }
2203
2204                 err = br_mdb_rehash(&br->mdb, mdb->max,
2205                                     br->hash_elasticity);
2206                 if (err)
2207                         goto rollback;
2208         }
2209
2210         br_multicast_open(br);
2211         list_for_each_entry(port, &br->port_list, list)
2212                 __br_multicast_enable_port(port);
2213
2214 unlock:
2215         spin_unlock_bh(&br->multicast_lock);
2216
2217         return err;
2218 }
2219
2220 bool br_multicast_enabled(const struct net_device *dev)
2221 {
2222         struct net_bridge *br = netdev_priv(dev);
2223
2224         return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
2225 }
2226 EXPORT_SYMBOL_GPL(br_multicast_enabled);
2227
2228 bool br_multicast_router(const struct net_device *dev)
2229 {
2230         struct net_bridge *br = netdev_priv(dev);
2231         bool is_router;
2232
2233         spin_lock_bh(&br->multicast_lock);
2234         is_router = br_multicast_is_router(br);
2235         spin_unlock_bh(&br->multicast_lock);
2236         return is_router;
2237 }
2238 EXPORT_SYMBOL_GPL(br_multicast_router);
2239
2240 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2241 {
2242         unsigned long max_delay;
2243
2244         val = !!val;
2245
2246         spin_lock_bh(&br->multicast_lock);
2247         if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
2248                 goto unlock;
2249
2250         br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
2251         if (!val)
2252                 goto unlock;
2253
2254         max_delay = br->multicast_query_response_interval;
2255
2256         if (!timer_pending(&br->ip4_other_query.timer))
2257                 br->ip4_other_query.delay_time = jiffies + max_delay;
2258
2259         br_multicast_start_querier(br, &br->ip4_own_query);
2260
2261 #if IS_ENABLED(CONFIG_IPV6)
2262         if (!timer_pending(&br->ip6_other_query.timer))
2263                 br->ip6_other_query.delay_time = jiffies + max_delay;
2264
2265         br_multicast_start_querier(br, &br->ip6_own_query);
2266 #endif
2267
2268 unlock:
2269         spin_unlock_bh(&br->multicast_lock);
2270
2271         return 0;
2272 }
2273
2274 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2275 {
2276         int err = -EINVAL;
2277         u32 old;
2278         struct net_bridge_mdb_htable *mdb;
2279
2280         spin_lock_bh(&br->multicast_lock);
2281         if (!is_power_of_2(val))
2282                 goto unlock;
2283
2284         mdb = mlock_dereference(br->mdb, br);
2285         if (mdb && val < mdb->size)
2286                 goto unlock;
2287
2288         err = 0;
2289
2290         old = br->hash_max;
2291         br->hash_max = val;
2292
2293         if (mdb) {
2294                 if (mdb->old) {
2295                         err = -EEXIST;
2296 rollback:
2297                         br->hash_max = old;
2298                         goto unlock;
2299                 }
2300
2301                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2302                                     br->hash_elasticity);
2303                 if (err)
2304                         goto rollback;
2305         }
2306
2307 unlock:
2308         spin_unlock_bh(&br->multicast_lock);
2309
2310         return err;
2311 }
2312
2313 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2314 {
2315         /* Currently we support only version 2 and 3 */
2316         switch (val) {
2317         case 2:
2318         case 3:
2319                 break;
2320         default:
2321                 return -EINVAL;
2322         }
2323
2324         spin_lock_bh(&br->multicast_lock);
2325         br->multicast_igmp_version = val;
2326         spin_unlock_bh(&br->multicast_lock);
2327
2328         return 0;
2329 }
2330
2331 #if IS_ENABLED(CONFIG_IPV6)
2332 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2333 {
2334         /* Currently we support version 1 and 2 */
2335         switch (val) {
2336         case 1:
2337         case 2:
2338                 break;
2339         default:
2340                 return -EINVAL;
2341         }
2342
2343         spin_lock_bh(&br->multicast_lock);
2344         br->multicast_mld_version = val;
2345         spin_unlock_bh(&br->multicast_lock);
2346
2347         return 0;
2348 }
2349 #endif
2350
2351 /**
2352  * br_multicast_list_adjacent - Returns snooped multicast addresses
2353  * @dev:        The bridge port adjacent to which to retrieve addresses
2354  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2355  *
2356  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2357  * snooping feature on all bridge ports of dev's bridge device, excluding
2358  * the addresses from dev itself.
2359  *
2360  * Returns the number of items added to br_ip_list.
2361  *
2362  * Notes:
2363  * - br_ip_list needs to be initialized by caller
2364  * - br_ip_list might contain duplicates in the end
2365  *   (needs to be taken care of by caller)
2366  * - br_ip_list needs to be freed by caller
2367  */
2368 int br_multicast_list_adjacent(struct net_device *dev,
2369                                struct list_head *br_ip_list)
2370 {
2371         struct net_bridge *br;
2372         struct net_bridge_port *port;
2373         struct net_bridge_port_group *group;
2374         struct br_ip_list *entry;
2375         int count = 0;
2376
2377         rcu_read_lock();
2378         if (!br_ip_list || !br_port_exists(dev))
2379                 goto unlock;
2380
2381         port = br_port_get_rcu(dev);
2382         if (!port || !port->br)
2383                 goto unlock;
2384
2385         br = port->br;
2386
2387         list_for_each_entry_rcu(port, &br->port_list, list) {
2388                 if (!port->dev || port->dev == dev)
2389                         continue;
2390
2391                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2392                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2393                         if (!entry)
2394                                 goto unlock;
2395
2396                         entry->addr = group->addr;
2397                         list_add(&entry->list, br_ip_list);
2398                         count++;
2399                 }
2400         }
2401
2402 unlock:
2403         rcu_read_unlock();
2404         return count;
2405 }
2406 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2407
2408 /**
2409  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2410  * @dev: The bridge port providing the bridge on which to check for a querier
2411  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2412  *
2413  * Checks whether the given interface has a bridge on top and if so returns
2414  * true if a valid querier exists anywhere on the bridged link layer.
2415  * Otherwise returns false.
2416  */
2417 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2418 {
2419         struct net_bridge *br;
2420         struct net_bridge_port *port;
2421         struct ethhdr eth;
2422         bool ret = false;
2423
2424         rcu_read_lock();
2425         if (!br_port_exists(dev))
2426                 goto unlock;
2427
2428         port = br_port_get_rcu(dev);
2429         if (!port || !port->br)
2430                 goto unlock;
2431
2432         br = port->br;
2433
2434         memset(&eth, 0, sizeof(eth));
2435         eth.h_proto = htons(proto);
2436
2437         ret = br_multicast_querier_exists(br, &eth);
2438
2439 unlock:
2440         rcu_read_unlock();
2441         return ret;
2442 }
2443 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2444
2445 /**
2446  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2447  * @dev: The bridge port adjacent to which to check for a querier
2448  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2449  *
2450  * Checks whether the given interface has a bridge on top and if so returns
2451  * true if a selected querier is behind one of the other ports of this
2452  * bridge. Otherwise returns false.
2453  */
2454 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2455 {
2456         struct net_bridge *br;
2457         struct net_bridge_port *port;
2458         bool ret = false;
2459
2460         rcu_read_lock();
2461         if (!br_port_exists(dev))
2462                 goto unlock;
2463
2464         port = br_port_get_rcu(dev);
2465         if (!port || !port->br)
2466                 goto unlock;
2467
2468         br = port->br;
2469
2470         switch (proto) {
2471         case ETH_P_IP:
2472                 if (!timer_pending(&br->ip4_other_query.timer) ||
2473                     rcu_dereference(br->ip4_querier.port) == port)
2474                         goto unlock;
2475                 break;
2476 #if IS_ENABLED(CONFIG_IPV6)
2477         case ETH_P_IPV6:
2478                 if (!timer_pending(&br->ip6_other_query.timer) ||
2479                     rcu_dereference(br->ip6_querier.port) == port)
2480                         goto unlock;
2481                 break;
2482 #endif
2483         default:
2484                 goto unlock;
2485         }
2486
2487         ret = true;
2488 unlock:
2489         rcu_read_unlock();
2490         return ret;
2491 }
2492 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2493
2494 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2495                                const struct sk_buff *skb, u8 type, u8 dir)
2496 {
2497         struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2498         __be16 proto = skb->protocol;
2499         unsigned int t_len;
2500
2501         u64_stats_update_begin(&pstats->syncp);
2502         switch (proto) {
2503         case htons(ETH_P_IP):
2504                 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2505                 switch (type) {
2506                 case IGMP_HOST_MEMBERSHIP_REPORT:
2507                         pstats->mstats.igmp_v1reports[dir]++;
2508                         break;
2509                 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2510                         pstats->mstats.igmp_v2reports[dir]++;
2511                         break;
2512                 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2513                         pstats->mstats.igmp_v3reports[dir]++;
2514                         break;
2515                 case IGMP_HOST_MEMBERSHIP_QUERY:
2516                         if (t_len != sizeof(struct igmphdr)) {
2517                                 pstats->mstats.igmp_v3queries[dir]++;
2518                         } else {
2519                                 unsigned int offset = skb_transport_offset(skb);
2520                                 struct igmphdr *ih, _ihdr;
2521
2522                                 ih = skb_header_pointer(skb, offset,
2523                                                         sizeof(_ihdr), &_ihdr);
2524                                 if (!ih)
2525                                         break;
2526                                 if (!ih->code)
2527                                         pstats->mstats.igmp_v1queries[dir]++;
2528                                 else
2529                                         pstats->mstats.igmp_v2queries[dir]++;
2530                         }
2531                         break;
2532                 case IGMP_HOST_LEAVE_MESSAGE:
2533                         pstats->mstats.igmp_leaves[dir]++;
2534                         break;
2535                 }
2536                 break;
2537 #if IS_ENABLED(CONFIG_IPV6)
2538         case htons(ETH_P_IPV6):
2539                 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2540                         sizeof(struct ipv6hdr);
2541                 t_len -= skb_network_header_len(skb);
2542                 switch (type) {
2543                 case ICMPV6_MGM_REPORT:
2544                         pstats->mstats.mld_v1reports[dir]++;
2545                         break;
2546                 case ICMPV6_MLD2_REPORT:
2547                         pstats->mstats.mld_v2reports[dir]++;
2548                         break;
2549                 case ICMPV6_MGM_QUERY:
2550                         if (t_len != sizeof(struct mld_msg))
2551                                 pstats->mstats.mld_v2queries[dir]++;
2552                         else
2553                                 pstats->mstats.mld_v1queries[dir]++;
2554                         break;
2555                 case ICMPV6_MGM_REDUCTION:
2556                         pstats->mstats.mld_leaves[dir]++;
2557                         break;
2558                 }
2559                 break;
2560 #endif /* CONFIG_IPV6 */
2561         }
2562         u64_stats_update_end(&pstats->syncp);
2563 }
2564
2565 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2566                         const struct sk_buff *skb, u8 type, u8 dir)
2567 {
2568         struct bridge_mcast_stats __percpu *stats;
2569
2570         /* if multicast_disabled is true then igmp type can't be set */
2571         if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
2572                 return;
2573
2574         if (p)
2575                 stats = p->mcast_stats;
2576         else
2577                 stats = br->mcast_stats;
2578         if (WARN_ON(!stats))
2579                 return;
2580
2581         br_mcast_stats_add(stats, skb, type, dir);
2582 }
2583
2584 int br_multicast_init_stats(struct net_bridge *br)
2585 {
2586         br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2587         if (!br->mcast_stats)
2588                 return -ENOMEM;
2589
2590         return 0;
2591 }
2592
2593 void br_multicast_uninit_stats(struct net_bridge *br)
2594 {
2595         free_percpu(br->mcast_stats);
2596 }
2597
2598 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2599 {
2600         dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2601         dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2602 }
2603
2604 void br_multicast_get_stats(const struct net_bridge *br,
2605                             const struct net_bridge_port *p,
2606                             struct br_mcast_stats *dest)
2607 {
2608         struct bridge_mcast_stats __percpu *stats;
2609         struct br_mcast_stats tdst;
2610         int i;
2611
2612         memset(dest, 0, sizeof(*dest));
2613         if (p)
2614                 stats = p->mcast_stats;
2615         else
2616                 stats = br->mcast_stats;
2617         if (WARN_ON(!stats))
2618                 return;
2619
2620         memset(&tdst, 0, sizeof(tdst));
2621         for_each_possible_cpu(i) {
2622                 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2623                 struct br_mcast_stats temp;
2624                 unsigned int start;
2625
2626                 do {
2627                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2628                         memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2629                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2630
2631                 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2632                 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2633                 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2634                 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2635                 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2636                 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2637                 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2638                 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2639
2640                 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2641                 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2642                 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2643                 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2644                 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2645                 tdst.mld_parse_errors += temp.mld_parse_errors;
2646         }
2647         memcpy(dest, &tdst, sizeof(*dest));
2648 }