net/bridge/br_multicast.c

   1 /*
   2  * Bridge multicast support.
   3  *
   4  * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/export.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/igmp.h>
  17 #include <linux/jhash.h>
  18 #include <linux/kernel.h>
  19 #include <linux/log2.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/netfilter_bridge.h>
  22 #include <linux/random.h>
  23 #include <linux/rculist.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/slab.h>
  26 #include <linux/timer.h>
  27 #include <linux/inetdevice.h>
  28 #include <net/ip.h>
  29 #if IS_ENABLED(CONFIG_IPV6)
  30 #include <net/ipv6.h>
  31 #include <net/mld.h>
  32 #include <net/ip6_checksum.h>
  33 #include <net/addrconf.h>
  34 #endif
  35
  36 #include "br_private.h"
  37
  38 static void br_multicast_start_querier(struct net_bridge *br,
  39                                        struct bridge_mcast_own_query *query);
  40 static void br_multicast_add_router(struct net_bridge *br,
  41                                     struct net_bridge_port *port);
  42 static void br_ip4_multicast_leave_group(struct net_bridge *br,
  43                                          struct net_bridge_port *port,
  44                                          __be32 group,
  45                                          __u16 vid);
  46 #if IS_ENABLED(CONFIG_IPV6)
  47 static void br_ip6_multicast_leave_group(struct net_bridge *br,
  48                                          struct net_bridge_port *port,
  49                                          const struct in6_addr *group,
  50                                          __u16 vid);
  51 #endif
  52 unsigned int br_mdb_rehash_seq;
  53
  54 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
  55 {
  56         if (a->proto != b->proto)
  57                 return 0;
  58         if (a->vid != b->vid)
  59                 return 0;
  60         switch (a->proto) {
  61         case htons(ETH_P_IP):
  62                 return a->u.ip4 == b->u.ip4;
  63 #if IS_ENABLED(CONFIG_IPV6)
  64         case htons(ETH_P_IPV6):
  65                 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
  66 #endif
  67         }
  68         return 0;
  69 }
  70
  71 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
  72                                 __u16 vid)
  73 {
  74         return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
  75 }
  76
  77 #if IS_ENABLED(CONFIG_IPV6)
  78 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
  79                                 const struct in6_addr *ip,
  80                                 __u16 vid)
  81 {
  82         return jhash_2words(ipv6_addr_hash(ip), vid,
  83                             mdb->secret) & (mdb->max - 1);
  84 }
  85 #endif
  86
  87 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
  88                              struct br_ip *ip)
  89 {
  90         switch (ip->proto) {
  91         case htons(ETH_P_IP):
  92                 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
  93 #if IS_ENABLED(CONFIG_IPV6)
  94         case htons(ETH_P_IPV6):
  95                 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
  96 #endif
  97         }
  98         return 0;
  99 }
 100
 101 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
 102         struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
 103 {
 104         struct net_bridge_mdb_entry *mp;
 105
 106         hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 107                 if (br_ip_equal(&mp->addr, dst))
 108                         return mp;
 109         }
 110
 111         return NULL;
 112 }
 113
 114 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
 115                                            struct br_ip *dst)
 116 {
 117         if (!mdb)
 118                 return NULL;
 119
 120         return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
 121 }
 122
 123 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
 124         struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
 125 {
 126         struct br_ip br_dst;
 127
 128         br_dst.u.ip4 = dst;
 129         br_dst.proto = htons(ETH_P_IP);
 130         br_dst.vid = vid;
 131
 132         return br_mdb_ip_get(mdb, &br_dst);
 133 }
 134
 135 #if IS_ENABLED(CONFIG_IPV6)
 136 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
 137         struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
 138         __u16 vid)
 139 {
 140         struct br_ip br_dst;
 141
 142         br_dst.u.ip6 = *dst;
 143         br_dst.proto = htons(ETH_P_IPV6);
 144         br_dst.vid = vid;
 145
 146         return br_mdb_ip_get(mdb, &br_dst);
 147 }
 148 #endif
 149
 150 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 151                                         struct sk_buff *skb, u16 vid)
 152 {
 153         struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
 154         struct br_ip ip;
 155
 156         if (br->multicast_disabled)
 157                 return NULL;
 158
 159         if (BR_INPUT_SKB_CB(skb)->igmp)
 160                 return NULL;
 161
 162         ip.proto = skb->protocol;
 163         ip.vid = vid;
 164
 165         switch (skb->protocol) {
 166         case htons(ETH_P_IP):
 167                 ip.u.ip4 = ip_hdr(skb)->daddr;
 168                 break;
 169 #if IS_ENABLED(CONFIG_IPV6)
 170         case htons(ETH_P_IPV6):
 171                 ip.u.ip6 = ipv6_hdr(skb)->daddr;
 172                 break;
 173 #endif
 174         default:
 175                 return NULL;
 176         }
 177
 178         return br_mdb_ip_get(mdb, &ip);
 179 }
 180
 181 static void br_mdb_free(struct rcu_head *head)
 182 {
 183         struct net_bridge_mdb_htable *mdb =
 184                 container_of(head, struct net_bridge_mdb_htable, rcu);
 185         struct net_bridge_mdb_htable *old = mdb->old;
 186
 187         mdb->old = NULL;
 188         kfree(old->mhash);
 189         kfree(old);
 190 }
 191
 192 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
 193                        struct net_bridge_mdb_htable *old,
 194                        int elasticity)
 195 {
 196         struct net_bridge_mdb_entry *mp;
 197         int maxlen;
 198         int len;
 199         int i;
 200
 201         for (i = 0; i < old->max; i++)
 202                 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
 203                         hlist_add_head(&mp->hlist[new->ver],
 204                                        &new->mhash[br_ip_hash(new, &mp->addr)]);
 205
 206         if (!elasticity)
 207                 return 0;
 208
 209         maxlen = 0;
 210         for (i = 0; i < new->max; i++) {
 211                 len = 0;
 212                 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
 213                         len++;
 214                 if (len > maxlen)
 215                         maxlen = len;
 216         }
 217
 218         return maxlen > elasticity ? -EINVAL : 0;
 219 }
 220
 221 void br_multicast_free_pg(struct rcu_head *head)
 222 {
 223         struct net_bridge_port_group *p =
 224                 container_of(head, struct net_bridge_port_group, rcu);
 225
 226         kfree(p);
 227 }
 228
 229 static void br_multicast_free_group(struct rcu_head *head)
 230 {
 231         struct net_bridge_mdb_entry *mp =
 232                 container_of(head, struct net_bridge_mdb_entry, rcu);
 233
 234         kfree(mp);
 235 }
 236
 237 static void br_multicast_group_expired(unsigned long data)
 238 {
 239         struct net_bridge_mdb_entry *mp = (void *)data;
 240         struct net_bridge *br = mp->br;
 241         struct net_bridge_mdb_htable *mdb;
 242
 243         spin_lock(&br->multicast_lock);
 244         if (!netif_running(br->dev) || timer_pending(&mp->timer))
 245                 goto out;
 246
 247         mp->mglist = false;
 248
 249         if (mp->ports)
 250                 goto out;
 251
 252         mdb = mlock_dereference(br->mdb, br);
 253
 254         hlist_del_rcu(&mp->hlist[mdb->ver]);
 255         mdb->size--;
 256
 257         call_rcu_bh(&mp->rcu, br_multicast_free_group);
 258
 259 out:
 260         spin_unlock(&br->multicast_lock);
 261 }
 262
 263 static void br_multicast_del_pg(struct net_bridge *br,
 264                                 struct net_bridge_port_group *pg)
 265 {
 266         struct net_bridge_mdb_htable *mdb;
 267         struct net_bridge_mdb_entry *mp;
 268         struct net_bridge_port_group *p;
 269         struct net_bridge_port_group __rcu **pp;
 270
 271         mdb = mlock_dereference(br->mdb, br);
 272
 273         mp = br_mdb_ip_get(mdb, &pg->addr);
 274         if (WARN_ON(!mp))
 275                 return;
 276
 277         for (pp = &mp->ports;
 278              (p = mlock_dereference(*pp, br)) != NULL;
 279              pp = &p->next) {
 280                 if (p != pg)
 281                         continue;
 282
 283                 rcu_assign_pointer(*pp, p->next);
 284                 hlist_del_init(&p->mglist);
 285                 del_timer(&p->timer);
 286                 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
 287                               p->flags);
 288                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
 289
 290                 if (!mp->ports && !mp->mglist &&
 291                     netif_running(br->dev))
 292                         mod_timer(&mp->timer, jiffies);
 293
 294                 return;
 295         }
 296
 297         WARN_ON(1);
 298 }
 299
 300 static void br_multicast_port_group_expired(unsigned long data)
 301 {
 302         struct net_bridge_port_group *pg = (void *)data;
 303         struct net_bridge *br = pg->port->br;
 304
 305         spin_lock(&br->multicast_lock);
 306         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
 307             hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
 308                 goto out;
 309
 310         br_multicast_del_pg(br, pg);
 311
 312 out:
 313         spin_unlock(&br->multicast_lock);
 314 }
 315
 316 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
 317                          int elasticity)
 318 {
 319         struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
 320         struct net_bridge_mdb_htable *mdb;
 321         int err;
 322
 323         mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
 324         if (!mdb)
 325                 return -ENOMEM;
 326
 327         mdb->max = max;
 328         mdb->old = old;
 329
 330         mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
 331         if (!mdb->mhash) {
 332                 kfree(mdb);
 333                 return -ENOMEM;
 334         }
 335
 336         mdb->size = old ? old->size : 0;
 337         mdb->ver = old ? old->ver ^ 1 : 0;
 338
 339         if (!old || elasticity)
 340                 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
 341         else
 342                 mdb->secret = old->secret;
 343
 344         if (!old)
 345                 goto out;
 346
 347         err = br_mdb_copy(mdb, old, elasticity);
 348         if (err) {
 349                 kfree(mdb->mhash);
 350                 kfree(mdb);
 351                 return err;
 352         }
 353
 354         br_mdb_rehash_seq++;
 355         call_rcu_bh(&mdb->rcu, br_mdb_free);
 356
 357 out:
 358         rcu_assign_pointer(*mdbp, mdb);
 359
 360         return 0;
 361 }
 362
 363 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
 364                                                     __be32 group,
 365                                                     u8 *igmp_type)
 366 {
 367         struct sk_buff *skb;
 368         struct igmphdr *ih;
 369         struct ethhdr *eth;
 370         struct iphdr *iph;
 371
 372         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
 373                                                  sizeof(*ih) + 4);
 374         if (!skb)
 375                 goto out;
 376
 377         skb->protocol = htons(ETH_P_IP);
 378
 379         skb_reset_mac_header(skb);
 380         eth = eth_hdr(skb);
 381
 382         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 383         eth->h_dest[0] = 1;
 384         eth->h_dest[1] = 0;
 385         eth->h_dest[2] = 0x5e;
 386         eth->h_dest[3] = 0;
 387         eth->h_dest[4] = 0;
 388         eth->h_dest[5] = 1;
 389         eth->h_proto = htons(ETH_P_IP);
 390         skb_put(skb, sizeof(*eth));
 391
 392         skb_set_network_header(skb, skb->len);
 393         iph = ip_hdr(skb);
 394
 395         iph->version = 4;
 396         iph->ihl = 6;
 397         iph->tos = 0xc0;
 398         iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
 399         iph->id = 0;
 400         iph->frag_off = htons(IP_DF);
 401         iph->ttl = 1;
 402         iph->protocol = IPPROTO_IGMP;
 403         iph->saddr = br->multicast_query_use_ifaddr ?
 404                      inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
 405         iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 406         ((u8 *)&iph[1])[0] = IPOPT_RA;
 407         ((u8 *)&iph[1])[1] = 4;
 408         ((u8 *)&iph[1])[2] = 0;
 409         ((u8 *)&iph[1])[3] = 0;
 410         ip_send_check(iph);
 411         skb_put(skb, 24);
 412
 413         skb_set_transport_header(skb, skb->len);
 414         ih = igmp_hdr(skb);
 415         *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
 416         ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
 417         ih->code = (group ? br->multicast_last_member_interval :
 418                             br->multicast_query_response_interval) /
 419                    (HZ / IGMP_TIMER_SCALE);
 420         ih->group = group;
 421         ih->csum = 0;
 422         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 423         skb_put(skb, sizeof(*ih));
 424
 425         __skb_pull(skb, sizeof(*eth));
 426
 427 out:
 428         return skb;
 429 }
 430
 431 #if IS_ENABLED(CONFIG_IPV6)
 432 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
 433                                                     const struct in6_addr *grp,
 434                                                     u8 *igmp_type)
 435 {
 436         struct sk_buff *skb;
 437         struct ipv6hdr *ip6h;
 438         struct mld_msg *mldq;
 439         struct ethhdr *eth;
 440         u8 *hopopt;
 441         unsigned long interval;
 442
 443         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
 444                                                  8 + sizeof(*mldq));
 445         if (!skb)
 446                 goto out;
 447
 448         skb->protocol = htons(ETH_P_IPV6);
 449
 450         /* Ethernet header */
 451         skb_reset_mac_header(skb);
 452         eth = eth_hdr(skb);
 453
 454         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 455         eth->h_proto = htons(ETH_P_IPV6);
 456         skb_put(skb, sizeof(*eth));
 457
 458         /* IPv6 header + HbH option */
 459         skb_set_network_header(skb, skb->len);
 460         ip6h = ipv6_hdr(skb);
 461
 462         *(__force __be32 *)ip6h = htonl(0x60000000);
 463         ip6h->payload_len = htons(8 + sizeof(*mldq));
 464         ip6h->nexthdr = IPPROTO_HOPOPTS;
 465         ip6h->hop_limit = 1;
 466         ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
 467         if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
 468                                &ip6h->saddr)) {
 469                 kfree_skb(skb);
 470                 br->has_ipv6_addr = 0;
 471                 return NULL;
 472         }
 473
 474         br->has_ipv6_addr = 1;
 475         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 476
 477         hopopt = (u8 *)(ip6h + 1);
 478         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
 479         hopopt[1] = 0;                          /* length of HbH */
 480         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
 481         hopopt[3] = 2;                          /* Length of RA Option */
 482         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
 483         hopopt[5] = 0;
 484         hopopt[6] = IPV6_TLV_PAD1;              /* Pad1 */
 485         hopopt[7] = IPV6_TLV_PAD1;              /* Pad1 */
 486
 487         skb_put(skb, sizeof(*ip6h) + 8);
 488
 489         /* ICMPv6 */
 490         skb_set_transport_header(skb, skb->len);
 491         mldq = (struct mld_msg *) icmp6_hdr(skb);
 492
 493         interval = ipv6_addr_any(grp) ?
 494                         br->multicast_query_response_interval :
 495                         br->multicast_last_member_interval;
 496
 497         *igmp_type = ICMPV6_MGM_QUERY;
 498         mldq->mld_type = ICMPV6_MGM_QUERY;
 499         mldq->mld_code = 0;
 500         mldq->mld_cksum = 0;
 501         mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
 502         mldq->mld_reserved = 0;
 503         mldq->mld_mca = *grp;
 504
 505         /* checksum */
 506         mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 507                                           sizeof(*mldq), IPPROTO_ICMPV6,
 508                                           csum_partial(mldq,
 509                                                        sizeof(*mldq), 0));
 510         skb_put(skb, sizeof(*mldq));
 511
 512         __skb_pull(skb, sizeof(*eth));
 513
 514 out:
 515         return skb;
 516 }
 517 #endif
 518
 519 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 520                                                 struct br_ip *addr,
 521                                                 u8 *igmp_type)
 522 {
 523         switch (addr->proto) {
 524         case htons(ETH_P_IP):
 525                 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
 526 #if IS_ENABLED(CONFIG_IPV6)
 527         case htons(ETH_P_IPV6):
 528                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
 529                                                     igmp_type);
 530 #endif
 531         }
 532         return NULL;
 533 }
 534
 535 static struct net_bridge_mdb_entry *br_multicast_get_group(
 536         struct net_bridge *br, struct net_bridge_port *port,
 537         struct br_ip *group, int hash)
 538 {
 539         struct net_bridge_mdb_htable *mdb;
 540         struct net_bridge_mdb_entry *mp;
 541         unsigned int count = 0;
 542         unsigned int max;
 543         int elasticity;
 544         int err;
 545
 546         mdb = rcu_dereference_protected(br->mdb, 1);
 547         hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 548                 count++;
 549                 if (unlikely(br_ip_equal(group, &mp->addr)))
 550                         return mp;
 551         }
 552
 553         elasticity = 0;
 554         max = mdb->max;
 555
 556         if (unlikely(count > br->hash_elasticity && count)) {
 557                 if (net_ratelimit())
 558                         br_info(br, "Multicast hash table "
 559                                 "chain limit reached: %s\n",
 560                                 port ? port->dev->name : br->dev->name);
 561
 562                 elasticity = br->hash_elasticity;
 563         }
 564
 565         if (mdb->size >= max) {
 566                 max *= 2;
 567                 if (unlikely(max > br->hash_max)) {
 568                         br_warn(br, "Multicast hash table maximum of %d "
 569                                 "reached, disabling snooping: %s\n",
 570                                 br->hash_max,
 571                                 port ? port->dev->name : br->dev->name);
 572                         err = -E2BIG;
 573 disable:
 574                         br->multicast_disabled = 1;
 575                         goto err;
 576                 }
 577         }
 578
 579         if (max > mdb->max || elasticity) {
 580                 if (mdb->old) {
 581                         if (net_ratelimit())
 582                                 br_info(br, "Multicast hash table "
 583                                         "on fire: %s\n",
 584                                         port ? port->dev->name : br->dev->name);
 585                         err = -EEXIST;
 586                         goto err;
 587                 }
 588
 589                 err = br_mdb_rehash(&br->mdb, max, elasticity);
 590                 if (err) {
 591                         br_warn(br, "Cannot rehash multicast "
 592                                 "hash table, disabling snooping: %s, %d, %d\n",
 593                                 port ? port->dev->name : br->dev->name,
 594                                 mdb->size, err);
 595                         goto disable;
 596                 }
 597
 598                 err = -EAGAIN;
 599                 goto err;
 600         }
 601
 602         return NULL;
 603
 604 err:
 605         mp = ERR_PTR(err);
 606         return mp;
 607 }
 608
 609 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 610         struct net_bridge_port *port, struct br_ip *group)
 611 {
 612         struct net_bridge_mdb_htable *mdb;
 613         struct net_bridge_mdb_entry *mp;
 614         int hash;
 615         int err;
 616
 617         mdb = rcu_dereference_protected(br->mdb, 1);
 618         if (!mdb) {
 619                 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
 620                 if (err)
 621                         return ERR_PTR(err);
 622                 goto rehash;
 623         }
 624
 625         hash = br_ip_hash(mdb, group);
 626         mp = br_multicast_get_group(br, port, group, hash);
 627         switch (PTR_ERR(mp)) {
 628         case 0:
 629                 break;
 630
 631         case -EAGAIN:
 632 rehash:
 633                 mdb = rcu_dereference_protected(br->mdb, 1);
 634                 hash = br_ip_hash(mdb, group);
 635                 break;
 636
 637         default:
 638                 goto out;
 639         }
 640
 641         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 642         if (unlikely(!mp))
 643                 return ERR_PTR(-ENOMEM);
 644
 645         mp->br = br;
 646         mp->addr = *group;
 647         setup_timer(&mp->timer, br_multicast_group_expired,
 648                     (unsigned long)mp);
 649
 650         hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
 651         mdb->size++;
 652
 653 out:
 654         return mp;
 655 }
 656
 657 struct net_bridge_port_group *br_multicast_new_port_group(
 658                         struct net_bridge_port *port,
 659                         struct br_ip *group,
 660                         struct net_bridge_port_group __rcu *next,
 661                         unsigned char flags)
 662 {
 663         struct net_bridge_port_group *p;
 664
 665         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 666         if (unlikely(!p))
 667                 return NULL;
 668
 669         p->addr = *group;
 670         p->port = port;
 671         p->flags = flags;
 672         rcu_assign_pointer(p->next, next);
 673         hlist_add_head(&p->mglist, &port->mglist);
 674         setup_timer(&p->timer, br_multicast_port_group_expired,
 675                     (unsigned long)p);
 676         return p;
 677 }
 678
 679 static int br_multicast_add_group(struct net_bridge *br,
 680                                   struct net_bridge_port *port,
 681                                   struct br_ip *group)
 682 {
 683         struct net_bridge_mdb_entry *mp;
 684         struct net_bridge_port_group *p;
 685         struct net_bridge_port_group __rcu **pp;
 686         unsigned long now = jiffies;
 687         int err;
 688
 689         spin_lock(&br->multicast_lock);
 690         if (!netif_running(br->dev) ||
 691             (port && port->state == BR_STATE_DISABLED))
 692                 goto out;
 693
 694         mp = br_multicast_new_group(br, port, group);
 695         err = PTR_ERR(mp);
 696         if (IS_ERR(mp))
 697                 goto err;
 698
 699         if (!port) {
 700                 mp->mglist = true;
 701                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
 702                 goto out;
 703         }
 704
 705         for (pp = &mp->ports;
 706              (p = mlock_dereference(*pp, br)) != NULL;
 707              pp = &p->next) {
 708                 if (p->port == port)
 709                         goto found;
 710                 if ((unsigned long)p->port < (unsigned long)port)
 711                         break;
 712         }
 713
 714         p = br_multicast_new_port_group(port, group, *pp, 0);
 715         if (unlikely(!p))
 716                 goto err;
 717         rcu_assign_pointer(*pp, p);
 718         br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
 719
 720 found:
 721         mod_timer(&p->timer, now + br->multicast_membership_interval);
 722 out:
 723         err = 0;
 724
 725 err:
 726         spin_unlock(&br->multicast_lock);
 727         return err;
 728 }
 729
 730 static int br_ip4_multicast_add_group(struct net_bridge *br,
 731                                       struct net_bridge_port *port,
 732                                       __be32 group,
 733                                       __u16 vid)
 734 {
 735         struct br_ip br_group;
 736
 737         if (ipv4_is_local_multicast(group))
 738                 return 0;
 739
 740         br_group.u.ip4 = group;
 741         br_group.proto = htons(ETH_P_IP);
 742         br_group.vid = vid;
 743
 744         return br_multicast_add_group(br, port, &br_group);
 745 }
 746
 747 #if IS_ENABLED(CONFIG_IPV6)
 748 static int br_ip6_multicast_add_group(struct net_bridge *br,
 749                                       struct net_bridge_port *port,
 750                                       const struct in6_addr *group,
 751                                       __u16 vid)
 752 {
 753         struct br_ip br_group;
 754
 755         if (ipv6_addr_is_ll_all_nodes(group))
 756                 return 0;
 757
 758         br_group.u.ip6 = *group;
 759         br_group.proto = htons(ETH_P_IPV6);
 760         br_group.vid = vid;
 761
 762         return br_multicast_add_group(br, port, &br_group);
 763 }
 764 #endif
 765
 766 static void br_multicast_router_expired(unsigned long data)
 767 {
 768         struct net_bridge_port *port = (void *)data;
 769         struct net_bridge *br = port->br;
 770
 771         spin_lock(&br->multicast_lock);
 772         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
 773             port->multicast_router == MDB_RTR_TYPE_PERM ||
 774             timer_pending(&port->multicast_router_timer) ||
 775             hlist_unhashed(&port->rlist))
 776                 goto out;
 777
 778         hlist_del_init_rcu(&port->rlist);
 779         br_rtr_notify(br->dev, port, RTM_DELMDB);
 780         /* Don't allow timer refresh if the router expired */
 781         if (port->multicast_router == MDB_RTR_TYPE_TEMP)
 782                 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
 783
 784 out:
 785         spin_unlock(&br->multicast_lock);
 786 }
 787
 788 static void br_multicast_local_router_expired(unsigned long data)
 789 {
 790 }
 791
 792 static void br_multicast_querier_expired(struct net_bridge *br,
 793                                          struct bridge_mcast_own_query *query)
 794 {
 795         spin_lock(&br->multicast_lock);
 796         if (!netif_running(br->dev) || br->multicast_disabled)
 797                 goto out;
 798
 799         br_multicast_start_querier(br, query);
 800
 801 out:
 802         spin_unlock(&br->multicast_lock);
 803 }
 804
 805 static void br_ip4_multicast_querier_expired(unsigned long data)
 806 {
 807         struct net_bridge *br = (void *)data;
 808
 809         br_multicast_querier_expired(br, &br->ip4_own_query);
 810 }
 811
 812 #if IS_ENABLED(CONFIG_IPV6)
 813 static void br_ip6_multicast_querier_expired(unsigned long data)
 814 {
 815         struct net_bridge *br = (void *)data;
 816
 817         br_multicast_querier_expired(br, &br->ip6_own_query);
 818 }
 819 #endif
 820
 821 static void br_multicast_select_own_querier(struct net_bridge *br,
 822                                             struct br_ip *ip,
 823                                             struct sk_buff *skb)
 824 {
 825         if (ip->proto == htons(ETH_P_IP))
 826                 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
 827 #if IS_ENABLED(CONFIG_IPV6)
 828         else
 829                 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
 830 #endif
 831 }
 832
 833 static void __br_multicast_send_query(struct net_bridge *br,
 834                                       struct net_bridge_port *port,
 835                                       struct br_ip *ip)
 836 {
 837         struct sk_buff *skb;
 838         u8 igmp_type;
 839
 840         skb = br_multicast_alloc_query(br, ip, &igmp_type);
 841         if (!skb)
 842                 return;
 843
 844         if (port) {
 845                 skb->dev = port->dev;
 846                 br_multicast_count(br, port, skb, igmp_type,
 847                                    BR_MCAST_DIR_TX);
 848                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
 849                         dev_net(port->dev), NULL, skb, NULL, skb->dev,
 850                         br_dev_queue_push_xmit);
 851         } else {
 852                 br_multicast_select_own_querier(br, ip, skb);
 853                 br_multicast_count(br, port, skb, igmp_type,
 854                                    BR_MCAST_DIR_RX);
 855                 netif_rx(skb);
 856         }
 857 }
 858
 859 static void br_multicast_send_query(struct net_bridge *br,
 860                                     struct net_bridge_port *port,
 861                                     struct bridge_mcast_own_query *own_query)
 862 {
 863         unsigned long time;
 864         struct br_ip br_group;
 865         struct bridge_mcast_other_query *other_query = NULL;
 866
 867         if (!netif_running(br->dev) || br->multicast_disabled ||
 868             !br->multicast_querier)
 869                 return;
 870
 871         memset(&br_group.u, 0, sizeof(br_group.u));
 872
 873         if (port ? (own_query == &port->ip4_own_query) :
 874                    (own_query == &br->ip4_own_query)) {
 875                 other_query = &br->ip4_other_query;
 876                 br_group.proto = htons(ETH_P_IP);
 877 #if IS_ENABLED(CONFIG_IPV6)
 878         } else {
 879                 other_query = &br->ip6_other_query;
 880                 br_group.proto = htons(ETH_P_IPV6);
 881 #endif
 882         }
 883
 884         if (!other_query || timer_pending(&other_query->timer))
 885                 return;
 886
 887         __br_multicast_send_query(br, port, &br_group);
 888
 889         time = jiffies;
 890         time += own_query->startup_sent < br->multicast_startup_query_count ?
 891                 br->multicast_startup_query_interval :
 892                 br->multicast_query_interval;
 893         mod_timer(&own_query->timer, time);
 894 }
 895
 896 static void
 897 br_multicast_port_query_expired(struct net_bridge_port *port,
 898                                 struct bridge_mcast_own_query *query)
 899 {
 900         struct net_bridge *br = port->br;
 901
 902         spin_lock(&br->multicast_lock);
 903         if (port->state == BR_STATE_DISABLED ||
 904             port->state == BR_STATE_BLOCKING)
 905                 goto out;
 906
 907         if (query->startup_sent < br->multicast_startup_query_count)
 908                 query->startup_sent++;
 909
 910         br_multicast_send_query(port->br, port, query);
 911
 912 out:
 913         spin_unlock(&br->multicast_lock);
 914 }
 915
 916 static void br_ip4_multicast_port_query_expired(unsigned long data)
 917 {
 918         struct net_bridge_port *port = (void *)data;
 919
 920         br_multicast_port_query_expired(port, &port->ip4_own_query);
 921 }
 922
 923 #if IS_ENABLED(CONFIG_IPV6)
 924 static void br_ip6_multicast_port_query_expired(unsigned long data)
 925 {
 926         struct net_bridge_port *port = (void *)data;
 927
 928         br_multicast_port_query_expired(port, &port->ip6_own_query);
 929 }
 930 #endif
 931
 932 int br_multicast_add_port(struct net_bridge_port *port)
 933 {
 934         port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
 935
 936         setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
 937                     (unsigned long)port);
 938         setup_timer(&port->ip4_own_query.timer,
 939                     br_ip4_multicast_port_query_expired, (unsigned long)port);
 940 #if IS_ENABLED(CONFIG_IPV6)
 941         setup_timer(&port->ip6_own_query.timer,
 942                     br_ip6_multicast_port_query_expired, (unsigned long)port);
 943 #endif
 944         port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
 945         if (!port->mcast_stats)
 946                 return -ENOMEM;
 947
 948         return 0;
 949 }
 950
 951 void br_multicast_del_port(struct net_bridge_port *port)
 952 {
 953         struct net_bridge *br = port->br;
 954         struct net_bridge_port_group *pg;
 955         struct hlist_node *n;
 956
 957         /* Take care of the remaining groups, only perm ones should be left */
 958         spin_lock_bh(&br->multicast_lock);
 959         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 960                 br_multicast_del_pg(br, pg);
 961         spin_unlock_bh(&br->multicast_lock);
 962         del_timer_sync(&port->multicast_router_timer);
 963         free_percpu(port->mcast_stats);
 964 }
 965
 966 static void br_multicast_enable(struct bridge_mcast_own_query *query)
 967 {
 968         query->startup_sent = 0;
 969
 970         if (try_to_del_timer_sync(&query->timer) >= 0 ||
 971             del_timer(&query->timer))
 972                 mod_timer(&query->timer, jiffies);
 973 }
 974
 975 static void __br_multicast_enable_port(struct net_bridge_port *port)
 976 {
 977         struct net_bridge *br = port->br;
 978
 979         if (br->multicast_disabled || !netif_running(br->dev))
 980                 return;
 981
 982         br_multicast_enable(&port->ip4_own_query);
 983 #if IS_ENABLED(CONFIG_IPV6)
 984         br_multicast_enable(&port->ip6_own_query);
 985 #endif
 986         if (port->multicast_router == MDB_RTR_TYPE_PERM &&
 987             hlist_unhashed(&port->rlist))
 988                 br_multicast_add_router(br, port);
 989 }
 990
 991 void br_multicast_enable_port(struct net_bridge_port *port)
 992 {
 993         struct net_bridge *br = port->br;
 994
 995         spin_lock(&br->multicast_lock);
 996         __br_multicast_enable_port(port);
 997         spin_unlock(&br->multicast_lock);
 998 }
 999
1000 void br_multicast_disable_port(struct net_bridge_port *port)
1001 {
1002         struct net_bridge *br = port->br;
1003         struct net_bridge_port_group *pg;
1004         struct hlist_node *n;
1005
1006         spin_lock(&br->multicast_lock);
1007         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1008                 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1009                         br_multicast_del_pg(br, pg);
1010
1011         if (!hlist_unhashed(&port->rlist)) {
1012                 hlist_del_init_rcu(&port->rlist);
1013                 br_rtr_notify(br->dev, port, RTM_DELMDB);
1014                 /* Don't allow timer refresh if disabling */
1015                 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
1016                         port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1017         }
1018         del_timer(&port->multicast_router_timer);
1019         del_timer(&port->ip4_own_query.timer);
1020 #if IS_ENABLED(CONFIG_IPV6)
1021         del_timer(&port->ip6_own_query.timer);
1022 #endif
1023         spin_unlock(&br->multicast_lock);
1024 }
1025
1026 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1027                                          struct net_bridge_port *port,
1028                                          struct sk_buff *skb,
1029                                          u16 vid)
1030 {
1031         struct igmpv3_report *ih;
1032         struct igmpv3_grec *grec;
1033         int i;
1034         int len;
1035         int num;
1036         int type;
1037         int err = 0;
1038         __be32 group;
1039         u16 nsrcs;
1040
1041         ih = igmpv3_report_hdr(skb);
1042         num = ntohs(ih->ngrec);
1043         len = skb_transport_offset(skb) + sizeof(*ih);
1044
1045         for (i = 0; i < num; i++) {
1046                 len += sizeof(*grec);
1047                 if (!pskb_may_pull(skb, len))
1048                         return -EINVAL;
1049
1050                 grec = (void *)(skb->data + len - sizeof(*grec));
1051                 group = grec->grec_mca;
1052                 type = grec->grec_type;
1053                 nsrcs = ntohs(grec->grec_nsrcs);
1054
1055                 len += nsrcs * 4;
1056                 if (!pskb_may_pull(skb, len))
1057                         return -EINVAL;
1058
1059                 /* We treat this as an IGMPv2 report for now. */
1060                 switch (type) {
1061                 case IGMPV3_MODE_IS_INCLUDE:
1062                 case IGMPV3_MODE_IS_EXCLUDE:
1063                 case IGMPV3_CHANGE_TO_INCLUDE:
1064                 case IGMPV3_CHANGE_TO_EXCLUDE:
1065                 case IGMPV3_ALLOW_NEW_SOURCES:
1066                 case IGMPV3_BLOCK_OLD_SOURCES:
1067                         break;
1068
1069                 default:
1070                         continue;
1071                 }
1072
1073                 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1074                      type == IGMPV3_MODE_IS_INCLUDE) &&
1075                     nsrcs == 0) {
1076                         br_ip4_multicast_leave_group(br, port, group, vid);
1077                 } else {
1078                         err = br_ip4_multicast_add_group(br, port, group, vid);
1079                         if (err)
1080                                 break;
1081                 }
1082         }
1083
1084         return err;
1085 }
1086
1087 #if IS_ENABLED(CONFIG_IPV6)
1088 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1089                                         struct net_bridge_port *port,
1090                                         struct sk_buff *skb,
1091                                         u16 vid)
1092 {
1093         struct icmp6hdr *icmp6h;
1094         struct mld2_grec *grec;
1095         int i;
1096         int len;
1097         int num;
1098         int err = 0;
1099
1100         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1101                 return -EINVAL;
1102
1103         icmp6h = icmp6_hdr(skb);
1104         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1105         len = skb_transport_offset(skb) + sizeof(*icmp6h);
1106
1107         for (i = 0; i < num; i++) {
1108                 __be16 *_nsrcs, __nsrcs;
1109                 u16 nsrcs;
1110
1111                 _nsrcs = skb_header_pointer(skb,
1112                                             len + offsetof(struct mld2_grec,
1113                                                            grec_nsrcs),
1114                                             sizeof(__nsrcs), &__nsrcs);
1115                 if (!_nsrcs)
1116                         return -EINVAL;
1117
1118                 nsrcs = ntohs(*_nsrcs);
1119
1120                 if (!pskb_may_pull(skb,
1121                                    len + sizeof(*grec) +
1122                                    sizeof(struct in6_addr) * nsrcs))
1123                         return -EINVAL;
1124
1125                 grec = (struct mld2_grec *)(skb->data + len);
1126                 len += sizeof(*grec) +
1127                        sizeof(struct in6_addr) * nsrcs;
1128
1129                 /* We treat these as MLDv1 reports for now. */
1130                 switch (grec->grec_type) {
1131                 case MLD2_MODE_IS_INCLUDE:
1132                 case MLD2_MODE_IS_EXCLUDE:
1133                 case MLD2_CHANGE_TO_INCLUDE:
1134                 case MLD2_CHANGE_TO_EXCLUDE:
1135                 case MLD2_ALLOW_NEW_SOURCES:
1136                 case MLD2_BLOCK_OLD_SOURCES:
1137                         break;
1138
1139                 default:
1140                         continue;
1141                 }
1142
1143                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1144                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1145                     nsrcs == 0) {
1146                         br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1147                                                      vid);
1148                 } else {
1149                         err = br_ip6_multicast_add_group(br, port,
1150                                                          &grec->grec_mca, vid);
1151                         if (err)
1152                                 break;
1153                 }
1154         }
1155
1156         return err;
1157 }
1158 #endif
1159
1160 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1161                                             struct net_bridge_port *port,
1162                                             __be32 saddr)
1163 {
1164         if (!timer_pending(&br->ip4_own_query.timer) &&
1165             !timer_pending(&br->ip4_other_query.timer))
1166                 goto update;
1167
1168         if (!br->ip4_querier.addr.u.ip4)
1169                 goto update;
1170
1171         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1172                 goto update;
1173
1174         return false;
1175
1176 update:
1177         br->ip4_querier.addr.u.ip4 = saddr;
1178
1179         /* update protected by general multicast_lock by caller */
1180         rcu_assign_pointer(br->ip4_querier.port, port);
1181
1182         return true;
1183 }
1184
1185 #if IS_ENABLED(CONFIG_IPV6)
1186 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1187                                             struct net_bridge_port *port,
1188                                             struct in6_addr *saddr)
1189 {
1190         if (!timer_pending(&br->ip6_own_query.timer) &&
1191             !timer_pending(&br->ip6_other_query.timer))
1192                 goto update;
1193
1194         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1195                 goto update;
1196
1197         return false;
1198
1199 update:
1200         br->ip6_querier.addr.u.ip6 = *saddr;
1201
1202         /* update protected by general multicast_lock by caller */
1203         rcu_assign_pointer(br->ip6_querier.port, port);
1204
1205         return true;
1206 }
1207 #endif
1208
1209 static bool br_multicast_select_querier(struct net_bridge *br,
1210                                         struct net_bridge_port *port,
1211                                         struct br_ip *saddr)
1212 {
1213         switch (saddr->proto) {
1214         case htons(ETH_P_IP):
1215                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1216 #if IS_ENABLED(CONFIG_IPV6)
1217         case htons(ETH_P_IPV6):
1218                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1219 #endif
1220         }
1221
1222         return false;
1223 }
1224
1225 static void
1226 br_multicast_update_query_timer(struct net_bridge *br,
1227                                 struct bridge_mcast_other_query *query,
1228                                 unsigned long max_delay)
1229 {
1230         if (!timer_pending(&query->timer))
1231                 query->delay_time = jiffies + max_delay;
1232
1233         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1234 }
1235
1236 /*
1237  * Add port to router_list
1238  *  list is maintained ordered by pointer value
1239  *  and locked by br->multicast_lock and RCU
1240  */
1241 static void br_multicast_add_router(struct net_bridge *br,
1242                                     struct net_bridge_port *port)
1243 {
1244         struct net_bridge_port *p;
1245         struct hlist_node *slot = NULL;
1246
1247         if (!hlist_unhashed(&port->rlist))
1248                 return;
1249
1250         hlist_for_each_entry(p, &br->router_list, rlist) {
1251                 if ((unsigned long) port >= (unsigned long) p)
1252                         break;
1253                 slot = &p->rlist;
1254         }
1255
1256         if (slot)
1257                 hlist_add_behind_rcu(&port->rlist, slot);
1258         else
1259                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1260         br_rtr_notify(br->dev, port, RTM_NEWMDB);
1261 }
1262
1263 static void br_multicast_mark_router(struct net_bridge *br,
1264                                      struct net_bridge_port *port)
1265 {
1266         unsigned long now = jiffies;
1267
1268         if (!port) {
1269                 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1270                         mod_timer(&br->multicast_router_timer,
1271                                   now + br->multicast_querier_interval);
1272                 return;
1273         }
1274
1275         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1276             port->multicast_router == MDB_RTR_TYPE_PERM)
1277                 return;
1278
1279         br_multicast_add_router(br, port);
1280
1281         mod_timer(&port->multicast_router_timer,
1282                   now + br->multicast_querier_interval);
1283 }
1284
1285 static void br_multicast_query_received(struct net_bridge *br,
1286                                         struct net_bridge_port *port,
1287                                         struct bridge_mcast_other_query *query,
1288                                         struct br_ip *saddr,
1289                                         unsigned long max_delay)
1290 {
1291         if (!br_multicast_select_querier(br, port, saddr))
1292                 return;
1293
1294         br_multicast_update_query_timer(br, query, max_delay);
1295         br_multicast_mark_router(br, port);
1296 }
1297
1298 static int br_ip4_multicast_query(struct net_bridge *br,
1299                                   struct net_bridge_port *port,
1300                                   struct sk_buff *skb,
1301                                   u16 vid)
1302 {
1303         const struct iphdr *iph = ip_hdr(skb);
1304         struct igmphdr *ih = igmp_hdr(skb);
1305         struct net_bridge_mdb_entry *mp;
1306         struct igmpv3_query *ih3;
1307         struct net_bridge_port_group *p;
1308         struct net_bridge_port_group __rcu **pp;
1309         struct br_ip saddr;
1310         unsigned long max_delay;
1311         unsigned long now = jiffies;
1312         unsigned int offset = skb_transport_offset(skb);
1313         __be32 group;
1314         int err = 0;
1315
1316         spin_lock(&br->multicast_lock);
1317         if (!netif_running(br->dev) ||
1318             (port && port->state == BR_STATE_DISABLED))
1319                 goto out;
1320
1321         group = ih->group;
1322
1323         if (skb->len == offset + sizeof(*ih)) {
1324                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1325
1326                 if (!max_delay) {
1327                         max_delay = 10 * HZ;
1328                         group = 0;
1329                 }
1330         } else if (skb->len >= offset + sizeof(*ih3)) {
1331                 ih3 = igmpv3_query_hdr(skb);
1332                 if (ih3->nsrcs)
1333                         goto out;
1334
1335                 max_delay = ih3->code ?
1336                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1337         } else {
1338                 goto out;
1339         }
1340
1341         if (!group) {
1342                 saddr.proto = htons(ETH_P_IP);
1343                 saddr.u.ip4 = iph->saddr;
1344
1345                 br_multicast_query_received(br, port, &br->ip4_other_query,
1346                                             &saddr, max_delay);
1347                 goto out;
1348         }
1349
1350         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1351         if (!mp)
1352                 goto out;
1353
1354         max_delay *= br->multicast_last_member_count;
1355
1356         if (mp->mglist &&
1357             (timer_pending(&mp->timer) ?
1358              time_after(mp->timer.expires, now + max_delay) :
1359              try_to_del_timer_sync(&mp->timer) >= 0))
1360                 mod_timer(&mp->timer, now + max_delay);
1361
1362         for (pp = &mp->ports;
1363              (p = mlock_dereference(*pp, br)) != NULL;
1364              pp = &p->next) {
1365                 if (timer_pending(&p->timer) ?
1366                     time_after(p->timer.expires, now + max_delay) :
1367                     try_to_del_timer_sync(&p->timer) >= 0)
1368                         mod_timer(&p->timer, now + max_delay);
1369         }
1370
1371 out:
1372         spin_unlock(&br->multicast_lock);
1373         return err;
1374 }
1375
1376 #if IS_ENABLED(CONFIG_IPV6)
1377 static int br_ip6_multicast_query(struct net_bridge *br,
1378                                   struct net_bridge_port *port,
1379                                   struct sk_buff *skb,
1380                                   u16 vid)
1381 {
1382         struct mld_msg *mld;
1383         struct net_bridge_mdb_entry *mp;
1384         struct mld2_query *mld2q;
1385         struct net_bridge_port_group *p;
1386         struct net_bridge_port_group __rcu **pp;
1387         struct br_ip saddr;
1388         unsigned long max_delay;
1389         unsigned long now = jiffies;
1390         unsigned int offset = skb_transport_offset(skb);
1391         const struct in6_addr *group = NULL;
1392         bool is_general_query;
1393         int err = 0;
1394
1395         spin_lock(&br->multicast_lock);
1396         if (!netif_running(br->dev) ||
1397             (port && port->state == BR_STATE_DISABLED))
1398                 goto out;
1399
1400         if (skb->len == offset + sizeof(*mld)) {
1401                 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1402                         err = -EINVAL;
1403                         goto out;
1404                 }
1405                 mld = (struct mld_msg *) icmp6_hdr(skb);
1406                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1407                 if (max_delay)
1408                         group = &mld->mld_mca;
1409         } else {
1410                 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1411                         err = -EINVAL;
1412                         goto out;
1413                 }
1414                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1415                 if (!mld2q->mld2q_nsrcs)
1416                         group = &mld2q->mld2q_mca;
1417
1418                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1419         }
1420
1421         is_general_query = group && ipv6_addr_any(group);
1422
1423         if (is_general_query) {
1424                 saddr.proto = htons(ETH_P_IPV6);
1425                 saddr.u.ip6 = ipv6_hdr(skb)->saddr;
1426
1427                 br_multicast_query_received(br, port, &br->ip6_other_query,
1428                                             &saddr, max_delay);
1429                 goto out;
1430         } else if (!group) {
1431                 goto out;
1432         }
1433
1434         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1435         if (!mp)
1436                 goto out;
1437
1438         max_delay *= br->multicast_last_member_count;
1439         if (mp->mglist &&
1440             (timer_pending(&mp->timer) ?
1441              time_after(mp->timer.expires, now + max_delay) :
1442              try_to_del_timer_sync(&mp->timer) >= 0))
1443                 mod_timer(&mp->timer, now + max_delay);
1444
1445         for (pp = &mp->ports;
1446              (p = mlock_dereference(*pp, br)) != NULL;
1447              pp = &p->next) {
1448                 if (timer_pending(&p->timer) ?
1449                     time_after(p->timer.expires, now + max_delay) :
1450                     try_to_del_timer_sync(&p->timer) >= 0)
1451                         mod_timer(&p->timer, now + max_delay);
1452         }
1453
1454 out:
1455         spin_unlock(&br->multicast_lock);
1456         return err;
1457 }
1458 #endif
1459
1460 static void
1461 br_multicast_leave_group(struct net_bridge *br,
1462                          struct net_bridge_port *port,
1463                          struct br_ip *group,
1464                          struct bridge_mcast_other_query *other_query,
1465                          struct bridge_mcast_own_query *own_query)
1466 {
1467         struct net_bridge_mdb_htable *mdb;
1468         struct net_bridge_mdb_entry *mp;
1469         struct net_bridge_port_group *p;
1470         unsigned long now;
1471         unsigned long time;
1472
1473         spin_lock(&br->multicast_lock);
1474         if (!netif_running(br->dev) ||
1475             (port && port->state == BR_STATE_DISABLED))
1476                 goto out;
1477
1478         mdb = mlock_dereference(br->mdb, br);
1479         mp = br_mdb_ip_get(mdb, group);
1480         if (!mp)
1481                 goto out;
1482
1483         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1484                 struct net_bridge_port_group __rcu **pp;
1485
1486                 for (pp = &mp->ports;
1487                      (p = mlock_dereference(*pp, br)) != NULL;
1488                      pp = &p->next) {
1489                         if (p->port != port)
1490                                 continue;
1491
1492                         if (p->flags & MDB_PG_FLAGS_PERMANENT)
1493                                 break;
1494
1495                         rcu_assign_pointer(*pp, p->next);
1496                         hlist_del_init(&p->mglist);
1497                         del_timer(&p->timer);
1498                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1499                         br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1500                                       p->flags);
1501
1502                         if (!mp->ports && !mp->mglist &&
1503                             netif_running(br->dev))
1504                                 mod_timer(&mp->timer, jiffies);
1505                 }
1506                 goto out;
1507         }
1508
1509         if (timer_pending(&other_query->timer))
1510                 goto out;
1511
1512         if (br->multicast_querier) {
1513                 __br_multicast_send_query(br, port, &mp->addr);
1514
1515                 time = jiffies + br->multicast_last_member_count *
1516                                  br->multicast_last_member_interval;
1517
1518                 mod_timer(&own_query->timer, time);
1519
1520                 for (p = mlock_dereference(mp->ports, br);
1521                      p != NULL;
1522                      p = mlock_dereference(p->next, br)) {
1523                         if (p->port != port)
1524                                 continue;
1525
1526                         if (!hlist_unhashed(&p->mglist) &&
1527                             (timer_pending(&p->timer) ?
1528                              time_after(p->timer.expires, time) :
1529                              try_to_del_timer_sync(&p->timer) >= 0)) {
1530                                 mod_timer(&p->timer, time);
1531                         }
1532
1533                         break;
1534                 }
1535         }
1536
1537         now = jiffies;
1538         time = now + br->multicast_last_member_count *
1539                      br->multicast_last_member_interval;
1540
1541         if (!port) {
1542                 if (mp->mglist &&
1543                     (timer_pending(&mp->timer) ?
1544                      time_after(mp->timer.expires, time) :
1545                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1546                         mod_timer(&mp->timer, time);
1547                 }
1548
1549                 goto out;
1550         }
1551
1552         for (p = mlock_dereference(mp->ports, br);
1553              p != NULL;
1554              p = mlock_dereference(p->next, br)) {
1555                 if (p->port != port)
1556                         continue;
1557
1558                 if (!hlist_unhashed(&p->mglist) &&
1559                     (timer_pending(&p->timer) ?
1560                      time_after(p->timer.expires, time) :
1561                      try_to_del_timer_sync(&p->timer) >= 0)) {
1562                         mod_timer(&p->timer, time);
1563                 }
1564
1565                 break;
1566         }
1567 out:
1568         spin_unlock(&br->multicast_lock);
1569 }
1570
1571 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1572                                          struct net_bridge_port *port,
1573                                          __be32 group,
1574                                          __u16 vid)
1575 {
1576         struct br_ip br_group;
1577         struct bridge_mcast_own_query *own_query;
1578
1579         if (ipv4_is_local_multicast(group))
1580                 return;
1581
1582         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1583
1584         br_group.u.ip4 = group;
1585         br_group.proto = htons(ETH_P_IP);
1586         br_group.vid = vid;
1587
1588         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1589                                  own_query);
1590 }
1591
1592 #if IS_ENABLED(CONFIG_IPV6)
1593 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1594                                          struct net_bridge_port *port,
1595                                          const struct in6_addr *group,
1596                                          __u16 vid)
1597 {
1598         struct br_ip br_group;
1599         struct bridge_mcast_own_query *own_query;
1600
1601         if (ipv6_addr_is_ll_all_nodes(group))
1602                 return;
1603
1604         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1605
1606         br_group.u.ip6 = *group;
1607         br_group.proto = htons(ETH_P_IPV6);
1608         br_group.vid = vid;
1609
1610         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1611                                  own_query);
1612 }
1613 #endif
1614
1615 static void br_multicast_err_count(const struct net_bridge *br,
1616                                    const struct net_bridge_port *p,
1617                                    __be16 proto)
1618 {
1619         struct bridge_mcast_stats __percpu *stats;
1620         struct bridge_mcast_stats *pstats;
1621
1622         if (!br->multicast_stats_enabled)
1623                 return;
1624
1625         if (p)
1626                 stats = p->mcast_stats;
1627         else
1628                 stats = br->mcast_stats;
1629         if (WARN_ON(!stats))
1630                 return;
1631
1632         pstats = this_cpu_ptr(stats);
1633
1634         u64_stats_update_begin(&pstats->syncp);
1635         switch (proto) {
1636         case htons(ETH_P_IP):
1637                 pstats->mstats.igmp_parse_errors++;
1638                 break;
1639 #if IS_ENABLED(CONFIG_IPV6)
1640         case htons(ETH_P_IPV6):
1641                 pstats->mstats.mld_parse_errors++;
1642                 break;
1643 #endif
1644         }
1645         u64_stats_update_end(&pstats->syncp);
1646 }
1647
1648 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1649                                  struct net_bridge_port *port,
1650                                  struct sk_buff *skb,
1651                                  u16 vid)
1652 {
1653         struct sk_buff *skb_trimmed = NULL;
1654         struct igmphdr *ih;
1655         int err;
1656
1657         err = ip_mc_check_igmp(skb, &skb_trimmed);
1658
1659         if (err == -ENOMSG) {
1660                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1661                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1662                 return 0;
1663         } else if (err < 0) {
1664                 br_multicast_err_count(br, port, skb->protocol);
1665                 return err;
1666         }
1667
1668         ih = igmp_hdr(skb);
1669         BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1670
1671         switch (ih->type) {
1672         case IGMP_HOST_MEMBERSHIP_REPORT:
1673         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1674                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1675                 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1676                 break;
1677         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1678                 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1679                 break;
1680         case IGMP_HOST_MEMBERSHIP_QUERY:
1681                 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1682                 break;
1683         case IGMP_HOST_LEAVE_MESSAGE:
1684                 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1685                 break;
1686         }
1687
1688         if (skb_trimmed && skb_trimmed != skb)
1689                 kfree_skb(skb_trimmed);
1690
1691         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1692                            BR_MCAST_DIR_RX);
1693
1694         return err;
1695 }
1696
1697 #if IS_ENABLED(CONFIG_IPV6)
1698 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1699                                  struct net_bridge_port *port,
1700                                  struct sk_buff *skb,
1701                                  u16 vid)
1702 {
1703         struct sk_buff *skb_trimmed = NULL;
1704         struct mld_msg *mld;
1705         int err;
1706
1707         err = ipv6_mc_check_mld(skb, &skb_trimmed);
1708
1709         if (err == -ENOMSG) {
1710                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1711                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1712                 return 0;
1713         } else if (err < 0) {
1714                 br_multicast_err_count(br, port, skb->protocol);
1715                 return err;
1716         }
1717
1718         mld = (struct mld_msg *)skb_transport_header(skb);
1719         BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1720
1721         switch (mld->mld_type) {
1722         case ICMPV6_MGM_REPORT:
1723                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1724                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1725                 break;
1726         case ICMPV6_MLD2_REPORT:
1727                 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1728                 break;
1729         case ICMPV6_MGM_QUERY:
1730                 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1731                 break;
1732         case ICMPV6_MGM_REDUCTION:
1733                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1734                 break;
1735         }
1736
1737         if (skb_trimmed && skb_trimmed != skb)
1738                 kfree_skb(skb_trimmed);
1739
1740         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1741                            BR_MCAST_DIR_RX);
1742
1743         return err;
1744 }
1745 #endif
1746
1747 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1748                      struct sk_buff *skb, u16 vid)
1749 {
1750         int ret = 0;
1751
1752         BR_INPUT_SKB_CB(skb)->igmp = 0;
1753         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1754
1755         if (br->multicast_disabled)
1756                 return 0;
1757
1758         switch (skb->protocol) {
1759         case htons(ETH_P_IP):
1760                 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1761                 break;
1762 #if IS_ENABLED(CONFIG_IPV6)
1763         case htons(ETH_P_IPV6):
1764                 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1765                 break;
1766 #endif
1767         }
1768
1769         return ret;
1770 }
1771
1772 static void br_multicast_query_expired(struct net_bridge *br,
1773                                        struct bridge_mcast_own_query *query,
1774                                        struct bridge_mcast_querier *querier)
1775 {
1776         spin_lock(&br->multicast_lock);
1777         if (query->startup_sent < br->multicast_startup_query_count)
1778                 query->startup_sent++;
1779
1780         RCU_INIT_POINTER(querier->port, NULL);
1781         br_multicast_send_query(br, NULL, query);
1782         spin_unlock(&br->multicast_lock);
1783 }
1784
1785 static void br_ip4_multicast_query_expired(unsigned long data)
1786 {
1787         struct net_bridge *br = (void *)data;
1788
1789         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1790 }
1791
1792 #if IS_ENABLED(CONFIG_IPV6)
1793 static void br_ip6_multicast_query_expired(unsigned long data)
1794 {
1795         struct net_bridge *br = (void *)data;
1796
1797         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1798 }
1799 #endif
1800
1801 void br_multicast_init(struct net_bridge *br)
1802 {
1803         br->hash_elasticity = 4;
1804         br->hash_max = 512;
1805
1806         br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1807         br->multicast_querier = 0;
1808         br->multicast_query_use_ifaddr = 0;
1809         br->multicast_last_member_count = 2;
1810         br->multicast_startup_query_count = 2;
1811
1812         br->multicast_last_member_interval = HZ;
1813         br->multicast_query_response_interval = 10 * HZ;
1814         br->multicast_startup_query_interval = 125 * HZ / 4;
1815         br->multicast_query_interval = 125 * HZ;
1816         br->multicast_querier_interval = 255 * HZ;
1817         br->multicast_membership_interval = 260 * HZ;
1818
1819         br->ip4_other_query.delay_time = 0;
1820         br->ip4_querier.port = NULL;
1821 #if IS_ENABLED(CONFIG_IPV6)
1822         br->ip6_other_query.delay_time = 0;
1823         br->ip6_querier.port = NULL;
1824 #endif
1825         br->has_ipv6_addr = 1;
1826
1827         spin_lock_init(&br->multicast_lock);
1828         setup_timer(&br->multicast_router_timer,
1829                     br_multicast_local_router_expired, 0);
1830         setup_timer(&br->ip4_other_query.timer,
1831                     br_ip4_multicast_querier_expired, (unsigned long)br);
1832         setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1833                     (unsigned long)br);
1834 #if IS_ENABLED(CONFIG_IPV6)
1835         setup_timer(&br->ip6_other_query.timer,
1836                     br_ip6_multicast_querier_expired, (unsigned long)br);
1837         setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1838                     (unsigned long)br);
1839 #endif
1840 }
1841
1842 static void __br_multicast_open(struct net_bridge *br,
1843                                 struct bridge_mcast_own_query *query)
1844 {
1845         query->startup_sent = 0;
1846
1847         if (br->multicast_disabled)
1848                 return;
1849
1850         mod_timer(&query->timer, jiffies);
1851 }
1852
1853 void br_multicast_open(struct net_bridge *br)
1854 {
1855         __br_multicast_open(br, &br->ip4_own_query);
1856 #if IS_ENABLED(CONFIG_IPV6)
1857         __br_multicast_open(br, &br->ip6_own_query);
1858 #endif
1859 }
1860
1861 void br_multicast_stop(struct net_bridge *br)
1862 {
1863         del_timer_sync(&br->multicast_router_timer);
1864         del_timer_sync(&br->ip4_other_query.timer);
1865         del_timer_sync(&br->ip4_own_query.timer);
1866 #if IS_ENABLED(CONFIG_IPV6)
1867         del_timer_sync(&br->ip6_other_query.timer);
1868         del_timer_sync(&br->ip6_own_query.timer);
1869 #endif
1870 }
1871
1872 void br_multicast_dev_del(struct net_bridge *br)
1873 {
1874         struct net_bridge_mdb_htable *mdb;
1875         struct net_bridge_mdb_entry *mp;
1876         struct hlist_node *n;
1877         u32 ver;
1878         int i;
1879
1880         spin_lock_bh(&br->multicast_lock);
1881         mdb = mlock_dereference(br->mdb, br);
1882         if (!mdb)
1883                 goto out;
1884
1885         br->mdb = NULL;
1886
1887         ver = mdb->ver;
1888         for (i = 0; i < mdb->max; i++) {
1889                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1890                                           hlist[ver]) {
1891                         del_timer(&mp->timer);
1892                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
1893                 }
1894         }
1895
1896         if (mdb->old) {
1897                 spin_unlock_bh(&br->multicast_lock);
1898                 rcu_barrier_bh();
1899                 spin_lock_bh(&br->multicast_lock);
1900                 WARN_ON(mdb->old);
1901         }
1902
1903         mdb->old = mdb;
1904         call_rcu_bh(&mdb->rcu, br_mdb_free);
1905
1906 out:
1907         spin_unlock_bh(&br->multicast_lock);
1908
1909         free_percpu(br->mcast_stats);
1910 }
1911
1912 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1913 {
1914         int err = -EINVAL;
1915
1916         spin_lock_bh(&br->multicast_lock);
1917
1918         switch (val) {
1919         case MDB_RTR_TYPE_DISABLED:
1920         case MDB_RTR_TYPE_PERM:
1921                 del_timer(&br->multicast_router_timer);
1922                 /* fall through */
1923         case MDB_RTR_TYPE_TEMP_QUERY:
1924                 br->multicast_router = val;
1925                 err = 0;
1926                 break;
1927         }
1928
1929         spin_unlock_bh(&br->multicast_lock);
1930
1931         return err;
1932 }
1933
1934 static void __del_port_router(struct net_bridge_port *p)
1935 {
1936         if (hlist_unhashed(&p->rlist))
1937                 return;
1938         hlist_del_init_rcu(&p->rlist);
1939         br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1940 }
1941
1942 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1943 {
1944         struct net_bridge *br = p->br;
1945         unsigned long now = jiffies;
1946         int err = -EINVAL;
1947
1948         spin_lock(&br->multicast_lock);
1949         if (p->multicast_router == val) {
1950                 /* Refresh the temp router port timer */
1951                 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1952                         mod_timer(&p->multicast_router_timer,
1953                                   now + br->multicast_querier_interval);
1954                 err = 0;
1955                 goto unlock;
1956         }
1957         switch (val) {
1958         case MDB_RTR_TYPE_DISABLED:
1959                 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1960                 __del_port_router(p);
1961                 del_timer(&p->multicast_router_timer);
1962                 break;
1963         case MDB_RTR_TYPE_TEMP_QUERY:
1964                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1965                 __del_port_router(p);
1966                 break;
1967         case MDB_RTR_TYPE_PERM:
1968                 p->multicast_router = MDB_RTR_TYPE_PERM;
1969                 del_timer(&p->multicast_router_timer);
1970                 br_multicast_add_router(br, p);
1971                 break;
1972         case MDB_RTR_TYPE_TEMP:
1973                 p->multicast_router = MDB_RTR_TYPE_TEMP;
1974                 br_multicast_mark_router(br, p);
1975                 break;
1976         default:
1977                 goto unlock;
1978         }
1979         err = 0;
1980 unlock:
1981         spin_unlock(&br->multicast_lock);
1982
1983         return err;
1984 }
1985
1986 static void br_multicast_start_querier(struct net_bridge *br,
1987                                        struct bridge_mcast_own_query *query)
1988 {
1989         struct net_bridge_port *port;
1990
1991         __br_multicast_open(br, query);
1992
1993         rcu_read_lock();
1994         list_for_each_entry_rcu(port, &br->port_list, list) {
1995                 if (port->state == BR_STATE_DISABLED ||
1996                     port->state == BR_STATE_BLOCKING)
1997                         continue;
1998
1999                 if (query == &br->ip4_own_query)
2000                         br_multicast_enable(&port->ip4_own_query);
2001 #if IS_ENABLED(CONFIG_IPV6)
2002                 else
2003                         br_multicast_enable(&port->ip6_own_query);
2004 #endif
2005         }
2006         rcu_read_unlock();
2007 }
2008
2009 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2010 {
2011         struct net_bridge_mdb_htable *mdb;
2012         struct net_bridge_port *port;
2013         int err = 0;
2014
2015         spin_lock_bh(&br->multicast_lock);
2016         if (br->multicast_disabled == !val)
2017                 goto unlock;
2018
2019         br->multicast_disabled = !val;
2020         if (br->multicast_disabled)
2021                 goto unlock;
2022
2023         if (!netif_running(br->dev))
2024                 goto unlock;
2025
2026         mdb = mlock_dereference(br->mdb, br);
2027         if (mdb) {
2028                 if (mdb->old) {
2029                         err = -EEXIST;
2030 rollback:
2031                         br->multicast_disabled = !!val;
2032                         goto unlock;
2033                 }
2034
2035                 err = br_mdb_rehash(&br->mdb, mdb->max,
2036                                     br->hash_elasticity);
2037                 if (err)
2038                         goto rollback;
2039         }
2040
2041         br_multicast_open(br);
2042         list_for_each_entry(port, &br->port_list, list)
2043                 __br_multicast_enable_port(port);
2044
2045 unlock:
2046         spin_unlock_bh(&br->multicast_lock);
2047
2048         return err;
2049 }
2050
2051 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2052 {
2053         unsigned long max_delay;
2054
2055         val = !!val;
2056
2057         spin_lock_bh(&br->multicast_lock);
2058         if (br->multicast_querier == val)
2059                 goto unlock;
2060
2061         br->multicast_querier = val;
2062         if (!val)
2063                 goto unlock;
2064
2065         max_delay = br->multicast_query_response_interval;
2066
2067         if (!timer_pending(&br->ip4_other_query.timer))
2068                 br->ip4_other_query.delay_time = jiffies + max_delay;
2069
2070         br_multicast_start_querier(br, &br->ip4_own_query);
2071
2072 #if IS_ENABLED(CONFIG_IPV6)
2073         if (!timer_pending(&br->ip6_other_query.timer))
2074                 br->ip6_other_query.delay_time = jiffies + max_delay;
2075
2076         br_multicast_start_querier(br, &br->ip6_own_query);
2077 #endif
2078
2079 unlock:
2080         spin_unlock_bh(&br->multicast_lock);
2081
2082         return 0;
2083 }
2084
2085 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2086 {
2087         int err = -EINVAL;
2088         u32 old;
2089         struct net_bridge_mdb_htable *mdb;
2090
2091         spin_lock_bh(&br->multicast_lock);
2092         if (!is_power_of_2(val))
2093                 goto unlock;
2094
2095         mdb = mlock_dereference(br->mdb, br);
2096         if (mdb && val < mdb->size)
2097                 goto unlock;
2098
2099         err = 0;
2100
2101         old = br->hash_max;
2102         br->hash_max = val;
2103
2104         if (mdb) {
2105                 if (mdb->old) {
2106                         err = -EEXIST;
2107 rollback:
2108                         br->hash_max = old;
2109                         goto unlock;
2110                 }
2111
2112                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2113                                     br->hash_elasticity);
2114                 if (err)
2115                         goto rollback;
2116         }
2117
2118 unlock:
2119         spin_unlock_bh(&br->multicast_lock);
2120
2121         return err;
2122 }
2123
2124 /**
2125  * br_multicast_list_adjacent - Returns snooped multicast addresses
2126  * @dev:        The bridge port adjacent to which to retrieve addresses
2127  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2128  *
2129  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2130  * snooping feature on all bridge ports of dev's bridge device, excluding
2131  * the addresses from dev itself.
2132  *
2133  * Returns the number of items added to br_ip_list.
2134  *
2135  * Notes:
2136  * - br_ip_list needs to be initialized by caller
2137  * - br_ip_list might contain duplicates in the end
2138  *   (needs to be taken care of by caller)
2139  * - br_ip_list needs to be freed by caller
2140  */
2141 int br_multicast_list_adjacent(struct net_device *dev,
2142                                struct list_head *br_ip_list)
2143 {
2144         struct net_bridge *br;
2145         struct net_bridge_port *port;
2146         struct net_bridge_port_group *group;
2147         struct br_ip_list *entry;
2148         int count = 0;
2149
2150         rcu_read_lock();
2151         if (!br_ip_list || !br_port_exists(dev))
2152                 goto unlock;
2153
2154         port = br_port_get_rcu(dev);
2155         if (!port || !port->br)
2156                 goto unlock;
2157
2158         br = port->br;
2159
2160         list_for_each_entry_rcu(port, &br->port_list, list) {
2161                 if (!port->dev || port->dev == dev)
2162                         continue;
2163
2164                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2165                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2166                         if (!entry)
2167                                 goto unlock;
2168
2169                         entry->addr = group->addr;
2170                         list_add(&entry->list, br_ip_list);
2171                         count++;
2172                 }
2173         }
2174
2175 unlock:
2176         rcu_read_unlock();
2177         return count;
2178 }
2179 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2180
2181 /**
2182  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2183  * @dev: The bridge port providing the bridge on which to check for a querier
2184  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2185  *
2186  * Checks whether the given interface has a bridge on top and if so returns
2187  * true if a valid querier exists anywhere on the bridged link layer.
2188  * Otherwise returns false.
2189  */
2190 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2191 {
2192         struct net_bridge *br;
2193         struct net_bridge_port *port;
2194         struct ethhdr eth;
2195         bool ret = false;
2196
2197         rcu_read_lock();
2198         if (!br_port_exists(dev))
2199                 goto unlock;
2200
2201         port = br_port_get_rcu(dev);
2202         if (!port || !port->br)
2203                 goto unlock;
2204
2205         br = port->br;
2206
2207         memset(&eth, 0, sizeof(eth));
2208         eth.h_proto = htons(proto);
2209
2210         ret = br_multicast_querier_exists(br, &eth);
2211
2212 unlock:
2213         rcu_read_unlock();
2214         return ret;
2215 }
2216 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2217
2218 /**
2219  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2220  * @dev: The bridge port adjacent to which to check for a querier
2221  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2222  *
2223  * Checks whether the given interface has a bridge on top and if so returns
2224  * true if a selected querier is behind one of the other ports of this
2225  * bridge. Otherwise returns false.
2226  */
2227 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2228 {
2229         struct net_bridge *br;
2230         struct net_bridge_port *port;
2231         bool ret = false;
2232
2233         rcu_read_lock();
2234         if (!br_port_exists(dev))
2235                 goto unlock;
2236
2237         port = br_port_get_rcu(dev);
2238         if (!port || !port->br)
2239                 goto unlock;
2240
2241         br = port->br;
2242
2243         switch (proto) {
2244         case ETH_P_IP:
2245                 if (!timer_pending(&br->ip4_other_query.timer) ||
2246                     rcu_dereference(br->ip4_querier.port) == port)
2247                         goto unlock;
2248                 break;
2249 #if IS_ENABLED(CONFIG_IPV6)
2250         case ETH_P_IPV6:
2251                 if (!timer_pending(&br->ip6_other_query.timer) ||
2252                     rcu_dereference(br->ip6_querier.port) == port)
2253                         goto unlock;
2254                 break;
2255 #endif
2256         default:
2257                 goto unlock;
2258         }
2259
2260         ret = true;
2261 unlock:
2262         rcu_read_unlock();
2263         return ret;
2264 }
2265 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2266
2267 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2268                                const struct sk_buff *skb, u8 type, u8 dir)
2269 {
2270         struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2271         __be16 proto = skb->protocol;
2272         unsigned int t_len;
2273
2274         u64_stats_update_begin(&pstats->syncp);
2275         switch (proto) {
2276         case htons(ETH_P_IP):
2277                 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2278                 switch (type) {
2279                 case IGMP_HOST_MEMBERSHIP_REPORT:
2280                         pstats->mstats.igmp_v1reports[dir]++;
2281                         break;
2282                 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2283                         pstats->mstats.igmp_v2reports[dir]++;
2284                         break;
2285                 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2286                         pstats->mstats.igmp_v3reports[dir]++;
2287                         break;
2288                 case IGMP_HOST_MEMBERSHIP_QUERY:
2289                         if (t_len != sizeof(struct igmphdr)) {
2290                                 pstats->mstats.igmp_v3queries[dir]++;
2291                         } else {
2292                                 unsigned int offset = skb_transport_offset(skb);
2293                                 struct igmphdr *ih, _ihdr;
2294
2295                                 ih = skb_header_pointer(skb, offset,
2296                                                         sizeof(_ihdr), &_ihdr);
2297                                 if (!ih)
2298                                         break;
2299                                 if (!ih->code)
2300                                         pstats->mstats.igmp_v1queries[dir]++;
2301                                 else
2302                                         pstats->mstats.igmp_v2queries[dir]++;
2303                         }
2304                         break;
2305                 case IGMP_HOST_LEAVE_MESSAGE:
2306                         pstats->mstats.igmp_leaves[dir]++;
2307                         break;
2308                 }
2309                 break;
2310 #if IS_ENABLED(CONFIG_IPV6)
2311         case htons(ETH_P_IPV6):
2312                 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2313                         sizeof(struct ipv6hdr);
2314                 t_len -= skb_network_header_len(skb);
2315                 switch (type) {
2316                 case ICMPV6_MGM_REPORT:
2317                         pstats->mstats.mld_v1reports[dir]++;
2318                         break;
2319                 case ICMPV6_MLD2_REPORT:
2320                         pstats->mstats.mld_v2reports[dir]++;
2321                         break;
2322                 case ICMPV6_MGM_QUERY:
2323                         if (t_len != sizeof(struct mld_msg))
2324                                 pstats->mstats.mld_v2queries[dir]++;
2325                         else
2326                                 pstats->mstats.mld_v1queries[dir]++;
2327                         break;
2328                 case ICMPV6_MGM_REDUCTION:
2329                         pstats->mstats.mld_leaves[dir]++;
2330                         break;
2331                 }
2332                 break;
2333 #endif /* CONFIG_IPV6 */
2334         }
2335         u64_stats_update_end(&pstats->syncp);
2336 }
2337
2338 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2339                         const struct sk_buff *skb, u8 type, u8 dir)
2340 {
2341         struct bridge_mcast_stats __percpu *stats;
2342
2343         /* if multicast_disabled is true then igmp type can't be set */
2344         if (!type || !br->multicast_stats_enabled)
2345                 return;
2346
2347         if (p)
2348                 stats = p->mcast_stats;
2349         else
2350                 stats = br->mcast_stats;
2351         if (WARN_ON(!stats))
2352                 return;
2353
2354         br_mcast_stats_add(stats, skb, type, dir);
2355 }
2356
2357 int br_multicast_init_stats(struct net_bridge *br)
2358 {
2359         br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2360         if (!br->mcast_stats)
2361                 return -ENOMEM;
2362
2363         return 0;
2364 }
2365
2366 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2367 {
2368         dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2369         dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2370 }
2371
2372 void br_multicast_get_stats(const struct net_bridge *br,
2373                             const struct net_bridge_port *p,
2374                             struct br_mcast_stats *dest)
2375 {
2376         struct bridge_mcast_stats __percpu *stats;
2377         struct br_mcast_stats tdst;
2378         int i;
2379
2380         memset(dest, 0, sizeof(*dest));
2381         if (p)
2382                 stats = p->mcast_stats;
2383         else
2384                 stats = br->mcast_stats;
2385         if (WARN_ON(!stats))
2386                 return;
2387
2388         memset(&tdst, 0, sizeof(tdst));
2389         for_each_possible_cpu(i) {
2390                 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2391                 struct br_mcast_stats temp;
2392                 unsigned int start;
2393
2394                 do {
2395                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2396                         memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2397                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2398
2399                 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2400                 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2401                 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2402                 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2403                 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2404                 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2405                 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2406                 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2407
2408                 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2409                 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2410                 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2411                 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2412                 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2413                 tdst.mld_parse_errors += temp.mld_parse_errors;
2414         }
2415         memcpy(dest, &tdst, sizeof(*dest));
2416 }