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 void br_multicast_enable_port(struct net_bridge_port *port)
 976 {
 977         struct net_bridge *br = port->br;
 978
 979         spin_lock(&br->multicast_lock);
 980         if (br->multicast_disabled || !netif_running(br->dev))
 981                 goto out;
 982
 983         br_multicast_enable(&port->ip4_own_query);
 984 #if IS_ENABLED(CONFIG_IPV6)
 985         br_multicast_enable(&port->ip6_own_query);
 986 #endif
 987         if (port->multicast_router == MDB_RTR_TYPE_PERM &&
 988             hlist_unhashed(&port->rlist))
 989                 br_multicast_add_router(br, port);
 990
 991 out:
 992         spin_unlock(&br->multicast_lock);
 993 }
 994
 995 void br_multicast_disable_port(struct net_bridge_port *port)
 996 {
 997         struct net_bridge *br = port->br;
 998         struct net_bridge_port_group *pg;
 999         struct hlist_node *n;
1000
1001         spin_lock(&br->multicast_lock);
1002         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1003                 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1004                         br_multicast_del_pg(br, pg);
1005
1006         if (!hlist_unhashed(&port->rlist)) {
1007                 hlist_del_init_rcu(&port->rlist);
1008                 br_rtr_notify(br->dev, port, RTM_DELMDB);
1009                 /* Don't allow timer refresh if disabling */
1010                 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
1011                         port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1012         }
1013         del_timer(&port->multicast_router_timer);
1014         del_timer(&port->ip4_own_query.timer);
1015 #if IS_ENABLED(CONFIG_IPV6)
1016         del_timer(&port->ip6_own_query.timer);
1017 #endif
1018         spin_unlock(&br->multicast_lock);
1019 }
1020
1021 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1022                                          struct net_bridge_port *port,
1023                                          struct sk_buff *skb,
1024                                          u16 vid)
1025 {
1026         struct igmpv3_report *ih;
1027         struct igmpv3_grec *grec;
1028         int i;
1029         int len;
1030         int num;
1031         int type;
1032         int err = 0;
1033         __be32 group;
1034
1035         ih = igmpv3_report_hdr(skb);
1036         num = ntohs(ih->ngrec);
1037         len = skb_transport_offset(skb) + sizeof(*ih);
1038
1039         for (i = 0; i < num; i++) {
1040                 len += sizeof(*grec);
1041                 if (!pskb_may_pull(skb, len))
1042                         return -EINVAL;
1043
1044                 grec = (void *)(skb->data + len - sizeof(*grec));
1045                 group = grec->grec_mca;
1046                 type = grec->grec_type;
1047
1048                 len += ntohs(grec->grec_nsrcs) * 4;
1049                 if (!pskb_may_pull(skb, len))
1050                         return -EINVAL;
1051
1052                 /* We treat this as an IGMPv2 report for now. */
1053                 switch (type) {
1054                 case IGMPV3_MODE_IS_INCLUDE:
1055                 case IGMPV3_MODE_IS_EXCLUDE:
1056                 case IGMPV3_CHANGE_TO_INCLUDE:
1057                 case IGMPV3_CHANGE_TO_EXCLUDE:
1058                 case IGMPV3_ALLOW_NEW_SOURCES:
1059                 case IGMPV3_BLOCK_OLD_SOURCES:
1060                         break;
1061
1062                 default:
1063                         continue;
1064                 }
1065
1066                 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1067                      type == IGMPV3_MODE_IS_INCLUDE) &&
1068                     ntohs(grec->grec_nsrcs) == 0) {
1069                         br_ip4_multicast_leave_group(br, port, group, vid);
1070                 } else {
1071                         err = br_ip4_multicast_add_group(br, port, group, vid);
1072                         if (err)
1073                                 break;
1074                 }
1075         }
1076
1077         return err;
1078 }
1079
1080 #if IS_ENABLED(CONFIG_IPV6)
1081 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1082                                         struct net_bridge_port *port,
1083                                         struct sk_buff *skb,
1084                                         u16 vid)
1085 {
1086         struct icmp6hdr *icmp6h;
1087         struct mld2_grec *grec;
1088         int i;
1089         int len;
1090         int num;
1091         int err = 0;
1092
1093         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1094                 return -EINVAL;
1095
1096         icmp6h = icmp6_hdr(skb);
1097         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1098         len = skb_transport_offset(skb) + sizeof(*icmp6h);
1099
1100         for (i = 0; i < num; i++) {
1101                 __be16 *nsrcs, _nsrcs;
1102
1103                 nsrcs = skb_header_pointer(skb,
1104                                            len + offsetof(struct mld2_grec,
1105                                                           grec_nsrcs),
1106                                            sizeof(_nsrcs), &_nsrcs);
1107                 if (!nsrcs)
1108                         return -EINVAL;
1109
1110                 if (!pskb_may_pull(skb,
1111                                    len + sizeof(*grec) +
1112                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
1113                         return -EINVAL;
1114
1115                 grec = (struct mld2_grec *)(skb->data + len);
1116                 len += sizeof(*grec) +
1117                        sizeof(struct in6_addr) * ntohs(*nsrcs);
1118
1119                 /* We treat these as MLDv1 reports for now. */
1120                 switch (grec->grec_type) {
1121                 case MLD2_MODE_IS_INCLUDE:
1122                 case MLD2_MODE_IS_EXCLUDE:
1123                 case MLD2_CHANGE_TO_INCLUDE:
1124                 case MLD2_CHANGE_TO_EXCLUDE:
1125                 case MLD2_ALLOW_NEW_SOURCES:
1126                 case MLD2_BLOCK_OLD_SOURCES:
1127                         break;
1128
1129                 default:
1130                         continue;
1131                 }
1132
1133                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1134                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1135                     ntohs(*nsrcs) == 0) {
1136                         br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1137                                                      vid);
1138                 } else {
1139                         err = br_ip6_multicast_add_group(br, port,
1140                                                          &grec->grec_mca, vid);
1141                         if (err)
1142                                 break;
1143                 }
1144         }
1145
1146         return err;
1147 }
1148 #endif
1149
1150 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1151                                             struct net_bridge_port *port,
1152                                             __be32 saddr)
1153 {
1154         if (!timer_pending(&br->ip4_own_query.timer) &&
1155             !timer_pending(&br->ip4_other_query.timer))
1156                 goto update;
1157
1158         if (!br->ip4_querier.addr.u.ip4)
1159                 goto update;
1160
1161         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1162                 goto update;
1163
1164         return false;
1165
1166 update:
1167         br->ip4_querier.addr.u.ip4 = saddr;
1168
1169         /* update protected by general multicast_lock by caller */
1170         rcu_assign_pointer(br->ip4_querier.port, port);
1171
1172         return true;
1173 }
1174
1175 #if IS_ENABLED(CONFIG_IPV6)
1176 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1177                                             struct net_bridge_port *port,
1178                                             struct in6_addr *saddr)
1179 {
1180         if (!timer_pending(&br->ip6_own_query.timer) &&
1181             !timer_pending(&br->ip6_other_query.timer))
1182                 goto update;
1183
1184         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1185                 goto update;
1186
1187         return false;
1188
1189 update:
1190         br->ip6_querier.addr.u.ip6 = *saddr;
1191
1192         /* update protected by general multicast_lock by caller */
1193         rcu_assign_pointer(br->ip6_querier.port, port);
1194
1195         return true;
1196 }
1197 #endif
1198
1199 static bool br_multicast_select_querier(struct net_bridge *br,
1200                                         struct net_bridge_port *port,
1201                                         struct br_ip *saddr)
1202 {
1203         switch (saddr->proto) {
1204         case htons(ETH_P_IP):
1205                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1206 #if IS_ENABLED(CONFIG_IPV6)
1207         case htons(ETH_P_IPV6):
1208                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1209 #endif
1210         }
1211
1212         return false;
1213 }
1214
1215 static void
1216 br_multicast_update_query_timer(struct net_bridge *br,
1217                                 struct bridge_mcast_other_query *query,
1218                                 unsigned long max_delay)
1219 {
1220         if (!timer_pending(&query->timer))
1221                 query->delay_time = jiffies + max_delay;
1222
1223         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1224 }
1225
1226 /*
1227  * Add port to router_list
1228  *  list is maintained ordered by pointer value
1229  *  and locked by br->multicast_lock and RCU
1230  */
1231 static void br_multicast_add_router(struct net_bridge *br,
1232                                     struct net_bridge_port *port)
1233 {
1234         struct net_bridge_port *p;
1235         struct hlist_node *slot = NULL;
1236
1237         if (!hlist_unhashed(&port->rlist))
1238                 return;
1239
1240         hlist_for_each_entry(p, &br->router_list, rlist) {
1241                 if ((unsigned long) port >= (unsigned long) p)
1242                         break;
1243                 slot = &p->rlist;
1244         }
1245
1246         if (slot)
1247                 hlist_add_behind_rcu(&port->rlist, slot);
1248         else
1249                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1250         br_rtr_notify(br->dev, port, RTM_NEWMDB);
1251 }
1252
1253 static void br_multicast_mark_router(struct net_bridge *br,
1254                                      struct net_bridge_port *port)
1255 {
1256         unsigned long now = jiffies;
1257
1258         if (!port) {
1259                 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1260                         mod_timer(&br->multicast_router_timer,
1261                                   now + br->multicast_querier_interval);
1262                 return;
1263         }
1264
1265         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1266             port->multicast_router == MDB_RTR_TYPE_PERM)
1267                 return;
1268
1269         br_multicast_add_router(br, port);
1270
1271         mod_timer(&port->multicast_router_timer,
1272                   now + br->multicast_querier_interval);
1273 }
1274
1275 static void br_multicast_query_received(struct net_bridge *br,
1276                                         struct net_bridge_port *port,
1277                                         struct bridge_mcast_other_query *query,
1278                                         struct br_ip *saddr,
1279                                         unsigned long max_delay)
1280 {
1281         if (!br_multicast_select_querier(br, port, saddr))
1282                 return;
1283
1284         br_multicast_update_query_timer(br, query, max_delay);
1285         br_multicast_mark_router(br, port);
1286 }
1287
1288 static int br_ip4_multicast_query(struct net_bridge *br,
1289                                   struct net_bridge_port *port,
1290                                   struct sk_buff *skb,
1291                                   u16 vid)
1292 {
1293         const struct iphdr *iph = ip_hdr(skb);
1294         struct igmphdr *ih = igmp_hdr(skb);
1295         struct net_bridge_mdb_entry *mp;
1296         struct igmpv3_query *ih3;
1297         struct net_bridge_port_group *p;
1298         struct net_bridge_port_group __rcu **pp;
1299         struct br_ip saddr;
1300         unsigned long max_delay;
1301         unsigned long now = jiffies;
1302         unsigned int offset = skb_transport_offset(skb);
1303         __be32 group;
1304         int err = 0;
1305
1306         spin_lock(&br->multicast_lock);
1307         if (!netif_running(br->dev) ||
1308             (port && port->state == BR_STATE_DISABLED))
1309                 goto out;
1310
1311         group = ih->group;
1312
1313         if (skb->len == offset + sizeof(*ih)) {
1314                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1315
1316                 if (!max_delay) {
1317                         max_delay = 10 * HZ;
1318                         group = 0;
1319                 }
1320         } else if (skb->len >= offset + sizeof(*ih3)) {
1321                 ih3 = igmpv3_query_hdr(skb);
1322                 if (ih3->nsrcs)
1323                         goto out;
1324
1325                 max_delay = ih3->code ?
1326                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1327         } else {
1328                 goto out;
1329         }
1330
1331         if (!group) {
1332                 saddr.proto = htons(ETH_P_IP);
1333                 saddr.u.ip4 = iph->saddr;
1334
1335                 br_multicast_query_received(br, port, &br->ip4_other_query,
1336                                             &saddr, max_delay);
1337                 goto out;
1338         }
1339
1340         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1341         if (!mp)
1342                 goto out;
1343
1344         max_delay *= br->multicast_last_member_count;
1345
1346         if (mp->mglist &&
1347             (timer_pending(&mp->timer) ?
1348              time_after(mp->timer.expires, now + max_delay) :
1349              try_to_del_timer_sync(&mp->timer) >= 0))
1350                 mod_timer(&mp->timer, now + max_delay);
1351
1352         for (pp = &mp->ports;
1353              (p = mlock_dereference(*pp, br)) != NULL;
1354              pp = &p->next) {
1355                 if (timer_pending(&p->timer) ?
1356                     time_after(p->timer.expires, now + max_delay) :
1357                     try_to_del_timer_sync(&p->timer) >= 0)
1358                         mod_timer(&p->timer, now + max_delay);
1359         }
1360
1361 out:
1362         spin_unlock(&br->multicast_lock);
1363         return err;
1364 }
1365
1366 #if IS_ENABLED(CONFIG_IPV6)
1367 static int br_ip6_multicast_query(struct net_bridge *br,
1368                                   struct net_bridge_port *port,
1369                                   struct sk_buff *skb,
1370                                   u16 vid)
1371 {
1372         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1373         struct mld_msg *mld;
1374         struct net_bridge_mdb_entry *mp;
1375         struct mld2_query *mld2q;
1376         struct net_bridge_port_group *p;
1377         struct net_bridge_port_group __rcu **pp;
1378         struct br_ip saddr;
1379         unsigned long max_delay;
1380         unsigned long now = jiffies;
1381         unsigned int offset = skb_transport_offset(skb);
1382         const struct in6_addr *group = NULL;
1383         bool is_general_query;
1384         int err = 0;
1385
1386         spin_lock(&br->multicast_lock);
1387         if (!netif_running(br->dev) ||
1388             (port && port->state == BR_STATE_DISABLED))
1389                 goto out;
1390
1391         if (skb->len == offset + sizeof(*mld)) {
1392                 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1393                         err = -EINVAL;
1394                         goto out;
1395                 }
1396                 mld = (struct mld_msg *) icmp6_hdr(skb);
1397                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1398                 if (max_delay)
1399                         group = &mld->mld_mca;
1400         } else {
1401                 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1402                         err = -EINVAL;
1403                         goto out;
1404                 }
1405                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1406                 if (!mld2q->mld2q_nsrcs)
1407                         group = &mld2q->mld2q_mca;
1408
1409                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1410         }
1411
1412         is_general_query = group && ipv6_addr_any(group);
1413
1414         if (is_general_query) {
1415                 saddr.proto = htons(ETH_P_IPV6);
1416                 saddr.u.ip6 = ip6h->saddr;
1417
1418                 br_multicast_query_received(br, port, &br->ip6_other_query,
1419                                             &saddr, max_delay);
1420                 goto out;
1421         } else if (!group) {
1422                 goto out;
1423         }
1424
1425         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1426         if (!mp)
1427                 goto out;
1428
1429         max_delay *= br->multicast_last_member_count;
1430         if (mp->mglist &&
1431             (timer_pending(&mp->timer) ?
1432              time_after(mp->timer.expires, now + max_delay) :
1433              try_to_del_timer_sync(&mp->timer) >= 0))
1434                 mod_timer(&mp->timer, now + max_delay);
1435
1436         for (pp = &mp->ports;
1437              (p = mlock_dereference(*pp, br)) != NULL;
1438              pp = &p->next) {
1439                 if (timer_pending(&p->timer) ?
1440                     time_after(p->timer.expires, now + max_delay) :
1441                     try_to_del_timer_sync(&p->timer) >= 0)
1442                         mod_timer(&p->timer, now + max_delay);
1443         }
1444
1445 out:
1446         spin_unlock(&br->multicast_lock);
1447         return err;
1448 }
1449 #endif
1450
1451 static void
1452 br_multicast_leave_group(struct net_bridge *br,
1453                          struct net_bridge_port *port,
1454                          struct br_ip *group,
1455                          struct bridge_mcast_other_query *other_query,
1456                          struct bridge_mcast_own_query *own_query)
1457 {
1458         struct net_bridge_mdb_htable *mdb;
1459         struct net_bridge_mdb_entry *mp;
1460         struct net_bridge_port_group *p;
1461         unsigned long now;
1462         unsigned long time;
1463
1464         spin_lock(&br->multicast_lock);
1465         if (!netif_running(br->dev) ||
1466             (port && port->state == BR_STATE_DISABLED))
1467                 goto out;
1468
1469         mdb = mlock_dereference(br->mdb, br);
1470         mp = br_mdb_ip_get(mdb, group);
1471         if (!mp)
1472                 goto out;
1473
1474         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1475                 struct net_bridge_port_group __rcu **pp;
1476
1477                 for (pp = &mp->ports;
1478                      (p = mlock_dereference(*pp, br)) != NULL;
1479                      pp = &p->next) {
1480                         if (p->port != port)
1481                                 continue;
1482
1483                         rcu_assign_pointer(*pp, p->next);
1484                         hlist_del_init(&p->mglist);
1485                         del_timer(&p->timer);
1486                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1487                         br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1488                                       p->flags);
1489
1490                         if (!mp->ports && !mp->mglist &&
1491                             netif_running(br->dev))
1492                                 mod_timer(&mp->timer, jiffies);
1493                 }
1494                 goto out;
1495         }
1496
1497         if (timer_pending(&other_query->timer))
1498                 goto out;
1499
1500         if (br->multicast_querier) {
1501                 __br_multicast_send_query(br, port, &mp->addr);
1502
1503                 time = jiffies + br->multicast_last_member_count *
1504                                  br->multicast_last_member_interval;
1505
1506                 mod_timer(&own_query->timer, time);
1507
1508                 for (p = mlock_dereference(mp->ports, br);
1509                      p != NULL;
1510                      p = mlock_dereference(p->next, br)) {
1511                         if (p->port != port)
1512                                 continue;
1513
1514                         if (!hlist_unhashed(&p->mglist) &&
1515                             (timer_pending(&p->timer) ?
1516                              time_after(p->timer.expires, time) :
1517                              try_to_del_timer_sync(&p->timer) >= 0)) {
1518                                 mod_timer(&p->timer, time);
1519                         }
1520
1521                         break;
1522                 }
1523         }
1524
1525         now = jiffies;
1526         time = now + br->multicast_last_member_count *
1527                      br->multicast_last_member_interval;
1528
1529         if (!port) {
1530                 if (mp->mglist &&
1531                     (timer_pending(&mp->timer) ?
1532                      time_after(mp->timer.expires, time) :
1533                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1534                         mod_timer(&mp->timer, time);
1535                 }
1536
1537                 goto out;
1538         }
1539
1540         for (p = mlock_dereference(mp->ports, br);
1541              p != NULL;
1542              p = mlock_dereference(p->next, br)) {
1543                 if (p->port != port)
1544                         continue;
1545
1546                 if (!hlist_unhashed(&p->mglist) &&
1547                     (timer_pending(&p->timer) ?
1548                      time_after(p->timer.expires, time) :
1549                      try_to_del_timer_sync(&p->timer) >= 0)) {
1550                         mod_timer(&p->timer, time);
1551                 }
1552
1553                 break;
1554         }
1555 out:
1556         spin_unlock(&br->multicast_lock);
1557 }
1558
1559 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1560                                          struct net_bridge_port *port,
1561                                          __be32 group,
1562                                          __u16 vid)
1563 {
1564         struct br_ip br_group;
1565         struct bridge_mcast_own_query *own_query;
1566
1567         if (ipv4_is_local_multicast(group))
1568                 return;
1569
1570         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1571
1572         br_group.u.ip4 = group;
1573         br_group.proto = htons(ETH_P_IP);
1574         br_group.vid = vid;
1575
1576         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1577                                  own_query);
1578 }
1579
1580 #if IS_ENABLED(CONFIG_IPV6)
1581 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1582                                          struct net_bridge_port *port,
1583                                          const struct in6_addr *group,
1584                                          __u16 vid)
1585 {
1586         struct br_ip br_group;
1587         struct bridge_mcast_own_query *own_query;
1588
1589         if (ipv6_addr_is_ll_all_nodes(group))
1590                 return;
1591
1592         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1593
1594         br_group.u.ip6 = *group;
1595         br_group.proto = htons(ETH_P_IPV6);
1596         br_group.vid = vid;
1597
1598         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1599                                  own_query);
1600 }
1601 #endif
1602
1603 static void br_multicast_err_count(const struct net_bridge *br,
1604                                    const struct net_bridge_port *p,
1605                                    __be16 proto)
1606 {
1607         struct bridge_mcast_stats __percpu *stats;
1608         struct bridge_mcast_stats *pstats;
1609
1610         if (!br->multicast_stats_enabled)
1611                 return;
1612
1613         if (p)
1614                 stats = p->mcast_stats;
1615         else
1616                 stats = br->mcast_stats;
1617         if (WARN_ON(!stats))
1618                 return;
1619
1620         pstats = this_cpu_ptr(stats);
1621
1622         u64_stats_update_begin(&pstats->syncp);
1623         switch (proto) {
1624         case htons(ETH_P_IP):
1625                 pstats->mstats.igmp_parse_errors++;
1626                 break;
1627 #if IS_ENABLED(CONFIG_IPV6)
1628         case htons(ETH_P_IPV6):
1629                 pstats->mstats.mld_parse_errors++;
1630                 break;
1631 #endif
1632         }
1633         u64_stats_update_end(&pstats->syncp);
1634 }
1635
1636 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1637                                  struct net_bridge_port *port,
1638                                  struct sk_buff *skb,
1639                                  u16 vid)
1640 {
1641         struct sk_buff *skb_trimmed = NULL;
1642         struct igmphdr *ih;
1643         int err;
1644
1645         err = ip_mc_check_igmp(skb, &skb_trimmed);
1646
1647         if (err == -ENOMSG) {
1648                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1649                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1650                 return 0;
1651         } else if (err < 0) {
1652                 br_multicast_err_count(br, port, skb->protocol);
1653                 return err;
1654         }
1655
1656         ih = igmp_hdr(skb);
1657         BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1658
1659         switch (ih->type) {
1660         case IGMP_HOST_MEMBERSHIP_REPORT:
1661         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1662                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1663                 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1664                 break;
1665         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1666                 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1667                 break;
1668         case IGMP_HOST_MEMBERSHIP_QUERY:
1669                 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1670                 break;
1671         case IGMP_HOST_LEAVE_MESSAGE:
1672                 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1673                 break;
1674         }
1675
1676         if (skb_trimmed && skb_trimmed != skb)
1677                 kfree_skb(skb_trimmed);
1678
1679         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1680                            BR_MCAST_DIR_RX);
1681
1682         return err;
1683 }
1684
1685 #if IS_ENABLED(CONFIG_IPV6)
1686 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1687                                  struct net_bridge_port *port,
1688                                  struct sk_buff *skb,
1689                                  u16 vid)
1690 {
1691         struct sk_buff *skb_trimmed = NULL;
1692         struct mld_msg *mld;
1693         int err;
1694
1695         err = ipv6_mc_check_mld(skb, &skb_trimmed);
1696
1697         if (err == -ENOMSG) {
1698                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1699                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1700                 return 0;
1701         } else if (err < 0) {
1702                 br_multicast_err_count(br, port, skb->protocol);
1703                 return err;
1704         }
1705
1706         mld = (struct mld_msg *)skb_transport_header(skb);
1707         BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1708
1709         switch (mld->mld_type) {
1710         case ICMPV6_MGM_REPORT:
1711                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1712                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1713                 break;
1714         case ICMPV6_MLD2_REPORT:
1715                 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1716                 break;
1717         case ICMPV6_MGM_QUERY:
1718                 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1719                 break;
1720         case ICMPV6_MGM_REDUCTION:
1721                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1722                 break;
1723         }
1724
1725         if (skb_trimmed && skb_trimmed != skb)
1726                 kfree_skb(skb_trimmed);
1727
1728         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1729                            BR_MCAST_DIR_RX);
1730
1731         return err;
1732 }
1733 #endif
1734
1735 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1736                      struct sk_buff *skb, u16 vid)
1737 {
1738         int ret = 0;
1739
1740         BR_INPUT_SKB_CB(skb)->igmp = 0;
1741         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1742
1743         if (br->multicast_disabled)
1744                 return 0;
1745
1746         switch (skb->protocol) {
1747         case htons(ETH_P_IP):
1748                 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1749                 break;
1750 #if IS_ENABLED(CONFIG_IPV6)
1751         case htons(ETH_P_IPV6):
1752                 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1753                 break;
1754 #endif
1755         }
1756
1757         return ret;
1758 }
1759
1760 static void br_multicast_query_expired(struct net_bridge *br,
1761                                        struct bridge_mcast_own_query *query,
1762                                        struct bridge_mcast_querier *querier)
1763 {
1764         spin_lock(&br->multicast_lock);
1765         if (query->startup_sent < br->multicast_startup_query_count)
1766                 query->startup_sent++;
1767
1768         RCU_INIT_POINTER(querier->port, NULL);
1769         br_multicast_send_query(br, NULL, query);
1770         spin_unlock(&br->multicast_lock);
1771 }
1772
1773 static void br_ip4_multicast_query_expired(unsigned long data)
1774 {
1775         struct net_bridge *br = (void *)data;
1776
1777         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1778 }
1779
1780 #if IS_ENABLED(CONFIG_IPV6)
1781 static void br_ip6_multicast_query_expired(unsigned long data)
1782 {
1783         struct net_bridge *br = (void *)data;
1784
1785         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1786 }
1787 #endif
1788
1789 void br_multicast_init(struct net_bridge *br)
1790 {
1791         br->hash_elasticity = 4;
1792         br->hash_max = 512;
1793
1794         br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1795         br->multicast_querier = 0;
1796         br->multicast_query_use_ifaddr = 0;
1797         br->multicast_last_member_count = 2;
1798         br->multicast_startup_query_count = 2;
1799
1800         br->multicast_last_member_interval = HZ;
1801         br->multicast_query_response_interval = 10 * HZ;
1802         br->multicast_startup_query_interval = 125 * HZ / 4;
1803         br->multicast_query_interval = 125 * HZ;
1804         br->multicast_querier_interval = 255 * HZ;
1805         br->multicast_membership_interval = 260 * HZ;
1806
1807         br->ip4_other_query.delay_time = 0;
1808         br->ip4_querier.port = NULL;
1809 #if IS_ENABLED(CONFIG_IPV6)
1810         br->ip6_other_query.delay_time = 0;
1811         br->ip6_querier.port = NULL;
1812 #endif
1813         br->has_ipv6_addr = 1;
1814
1815         spin_lock_init(&br->multicast_lock);
1816         setup_timer(&br->multicast_router_timer,
1817                     br_multicast_local_router_expired, 0);
1818         setup_timer(&br->ip4_other_query.timer,
1819                     br_ip4_multicast_querier_expired, (unsigned long)br);
1820         setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1821                     (unsigned long)br);
1822 #if IS_ENABLED(CONFIG_IPV6)
1823         setup_timer(&br->ip6_other_query.timer,
1824                     br_ip6_multicast_querier_expired, (unsigned long)br);
1825         setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1826                     (unsigned long)br);
1827 #endif
1828 }
1829
1830 static void __br_multicast_open(struct net_bridge *br,
1831                                 struct bridge_mcast_own_query *query)
1832 {
1833         query->startup_sent = 0;
1834
1835         if (br->multicast_disabled)
1836                 return;
1837
1838         mod_timer(&query->timer, jiffies);
1839 }
1840
1841 void br_multicast_open(struct net_bridge *br)
1842 {
1843         __br_multicast_open(br, &br->ip4_own_query);
1844 #if IS_ENABLED(CONFIG_IPV6)
1845         __br_multicast_open(br, &br->ip6_own_query);
1846 #endif
1847 }
1848
1849 void br_multicast_stop(struct net_bridge *br)
1850 {
1851         del_timer_sync(&br->multicast_router_timer);
1852         del_timer_sync(&br->ip4_other_query.timer);
1853         del_timer_sync(&br->ip4_own_query.timer);
1854 #if IS_ENABLED(CONFIG_IPV6)
1855         del_timer_sync(&br->ip6_other_query.timer);
1856         del_timer_sync(&br->ip6_own_query.timer);
1857 #endif
1858 }
1859
1860 void br_multicast_dev_del(struct net_bridge *br)
1861 {
1862         struct net_bridge_mdb_htable *mdb;
1863         struct net_bridge_mdb_entry *mp;
1864         struct hlist_node *n;
1865         u32 ver;
1866         int i;
1867
1868         spin_lock_bh(&br->multicast_lock);
1869         mdb = mlock_dereference(br->mdb, br);
1870         if (!mdb)
1871                 goto out;
1872
1873         br->mdb = NULL;
1874
1875         ver = mdb->ver;
1876         for (i = 0; i < mdb->max; i++) {
1877                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1878                                           hlist[ver]) {
1879                         del_timer(&mp->timer);
1880                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
1881                 }
1882         }
1883
1884         if (mdb->old) {
1885                 spin_unlock_bh(&br->multicast_lock);
1886                 rcu_barrier_bh();
1887                 spin_lock_bh(&br->multicast_lock);
1888                 WARN_ON(mdb->old);
1889         }
1890
1891         mdb->old = mdb;
1892         call_rcu_bh(&mdb->rcu, br_mdb_free);
1893
1894 out:
1895         spin_unlock_bh(&br->multicast_lock);
1896
1897         free_percpu(br->mcast_stats);
1898 }
1899
1900 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1901 {
1902         int err = -EINVAL;
1903
1904         spin_lock_bh(&br->multicast_lock);
1905
1906         switch (val) {
1907         case MDB_RTR_TYPE_DISABLED:
1908         case MDB_RTR_TYPE_PERM:
1909                 del_timer(&br->multicast_router_timer);
1910                 /* fall through */
1911         case MDB_RTR_TYPE_TEMP_QUERY:
1912                 br->multicast_router = val;
1913                 err = 0;
1914                 break;
1915         }
1916
1917         spin_unlock_bh(&br->multicast_lock);
1918
1919         return err;
1920 }
1921
1922 static void __del_port_router(struct net_bridge_port *p)
1923 {
1924         if (hlist_unhashed(&p->rlist))
1925                 return;
1926         hlist_del_init_rcu(&p->rlist);
1927         br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1928 }
1929
1930 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1931 {
1932         struct net_bridge *br = p->br;
1933         unsigned long now = jiffies;
1934         int err = -EINVAL;
1935
1936         spin_lock(&br->multicast_lock);
1937         if (p->multicast_router == val) {
1938                 /* Refresh the temp router port timer */
1939                 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1940                         mod_timer(&p->multicast_router_timer,
1941                                   now + br->multicast_querier_interval);
1942                 err = 0;
1943                 goto unlock;
1944         }
1945         switch (val) {
1946         case MDB_RTR_TYPE_DISABLED:
1947                 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1948                 __del_port_router(p);
1949                 del_timer(&p->multicast_router_timer);
1950                 break;
1951         case MDB_RTR_TYPE_TEMP_QUERY:
1952                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1953                 __del_port_router(p);
1954                 break;
1955         case MDB_RTR_TYPE_PERM:
1956                 p->multicast_router = MDB_RTR_TYPE_PERM;
1957                 del_timer(&p->multicast_router_timer);
1958                 br_multicast_add_router(br, p);
1959                 break;
1960         case MDB_RTR_TYPE_TEMP:
1961                 p->multicast_router = MDB_RTR_TYPE_TEMP;
1962                 br_multicast_mark_router(br, p);
1963                 break;
1964         default:
1965                 goto unlock;
1966         }
1967         err = 0;
1968 unlock:
1969         spin_unlock(&br->multicast_lock);
1970
1971         return err;
1972 }
1973
1974 static void br_multicast_start_querier(struct net_bridge *br,
1975                                        struct bridge_mcast_own_query *query)
1976 {
1977         struct net_bridge_port *port;
1978
1979         __br_multicast_open(br, query);
1980
1981         list_for_each_entry(port, &br->port_list, list) {
1982                 if (port->state == BR_STATE_DISABLED ||
1983                     port->state == BR_STATE_BLOCKING)
1984                         continue;
1985
1986                 if (query == &br->ip4_own_query)
1987                         br_multicast_enable(&port->ip4_own_query);
1988 #if IS_ENABLED(CONFIG_IPV6)
1989                 else
1990                         br_multicast_enable(&port->ip6_own_query);
1991 #endif
1992         }
1993 }
1994
1995 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1996 {
1997         int err = 0;
1998         struct net_bridge_mdb_htable *mdb;
1999
2000         spin_lock_bh(&br->multicast_lock);
2001         if (br->multicast_disabled == !val)
2002                 goto unlock;
2003
2004         br->multicast_disabled = !val;
2005         if (br->multicast_disabled)
2006                 goto unlock;
2007
2008         if (!netif_running(br->dev))
2009                 goto unlock;
2010
2011         mdb = mlock_dereference(br->mdb, br);
2012         if (mdb) {
2013                 if (mdb->old) {
2014                         err = -EEXIST;
2015 rollback:
2016                         br->multicast_disabled = !!val;
2017                         goto unlock;
2018                 }
2019
2020                 err = br_mdb_rehash(&br->mdb, mdb->max,
2021                                     br->hash_elasticity);
2022                 if (err)
2023                         goto rollback;
2024         }
2025
2026         br_multicast_start_querier(br, &br->ip4_own_query);
2027 #if IS_ENABLED(CONFIG_IPV6)
2028         br_multicast_start_querier(br, &br->ip6_own_query);
2029 #endif
2030
2031 unlock:
2032         spin_unlock_bh(&br->multicast_lock);
2033
2034         return err;
2035 }
2036
2037 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2038 {
2039         unsigned long max_delay;
2040
2041         val = !!val;
2042
2043         spin_lock_bh(&br->multicast_lock);
2044         if (br->multicast_querier == val)
2045                 goto unlock;
2046
2047         br->multicast_querier = val;
2048         if (!val)
2049                 goto unlock;
2050
2051         max_delay = br->multicast_query_response_interval;
2052
2053         if (!timer_pending(&br->ip4_other_query.timer))
2054                 br->ip4_other_query.delay_time = jiffies + max_delay;
2055
2056         br_multicast_start_querier(br, &br->ip4_own_query);
2057
2058 #if IS_ENABLED(CONFIG_IPV6)
2059         if (!timer_pending(&br->ip6_other_query.timer))
2060                 br->ip6_other_query.delay_time = jiffies + max_delay;
2061
2062         br_multicast_start_querier(br, &br->ip6_own_query);
2063 #endif
2064
2065 unlock:
2066         spin_unlock_bh(&br->multicast_lock);
2067
2068         return 0;
2069 }
2070
2071 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2072 {
2073         int err = -EINVAL;
2074         u32 old;
2075         struct net_bridge_mdb_htable *mdb;
2076
2077         spin_lock_bh(&br->multicast_lock);
2078         if (!is_power_of_2(val))
2079                 goto unlock;
2080
2081         mdb = mlock_dereference(br->mdb, br);
2082         if (mdb && val < mdb->size)
2083                 goto unlock;
2084
2085         err = 0;
2086
2087         old = br->hash_max;
2088         br->hash_max = val;
2089
2090         if (mdb) {
2091                 if (mdb->old) {
2092                         err = -EEXIST;
2093 rollback:
2094                         br->hash_max = old;
2095                         goto unlock;
2096                 }
2097
2098                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2099                                     br->hash_elasticity);
2100                 if (err)
2101                         goto rollback;
2102         }
2103
2104 unlock:
2105         spin_unlock_bh(&br->multicast_lock);
2106
2107         return err;
2108 }
2109
2110 /**
2111  * br_multicast_list_adjacent - Returns snooped multicast addresses
2112  * @dev:        The bridge port adjacent to which to retrieve addresses
2113  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2114  *
2115  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2116  * snooping feature on all bridge ports of dev's bridge device, excluding
2117  * the addresses from dev itself.
2118  *
2119  * Returns the number of items added to br_ip_list.
2120  *
2121  * Notes:
2122  * - br_ip_list needs to be initialized by caller
2123  * - br_ip_list might contain duplicates in the end
2124  *   (needs to be taken care of by caller)
2125  * - br_ip_list needs to be freed by caller
2126  */
2127 int br_multicast_list_adjacent(struct net_device *dev,
2128                                struct list_head *br_ip_list)
2129 {
2130         struct net_bridge *br;
2131         struct net_bridge_port *port;
2132         struct net_bridge_port_group *group;
2133         struct br_ip_list *entry;
2134         int count = 0;
2135
2136         rcu_read_lock();
2137         if (!br_ip_list || !br_port_exists(dev))
2138                 goto unlock;
2139
2140         port = br_port_get_rcu(dev);
2141         if (!port || !port->br)
2142                 goto unlock;
2143
2144         br = port->br;
2145
2146         list_for_each_entry_rcu(port, &br->port_list, list) {
2147                 if (!port->dev || port->dev == dev)
2148                         continue;
2149
2150                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2151                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2152                         if (!entry)
2153                                 goto unlock;
2154
2155                         entry->addr = group->addr;
2156                         list_add(&entry->list, br_ip_list);
2157                         count++;
2158                 }
2159         }
2160
2161 unlock:
2162         rcu_read_unlock();
2163         return count;
2164 }
2165 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2166
2167 /**
2168  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2169  * @dev: The bridge port providing the bridge on which to check for a querier
2170  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2171  *
2172  * Checks whether the given interface has a bridge on top and if so returns
2173  * true if a valid querier exists anywhere on the bridged link layer.
2174  * Otherwise returns false.
2175  */
2176 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2177 {
2178         struct net_bridge *br;
2179         struct net_bridge_port *port;
2180         struct ethhdr eth;
2181         bool ret = false;
2182
2183         rcu_read_lock();
2184         if (!br_port_exists(dev))
2185                 goto unlock;
2186
2187         port = br_port_get_rcu(dev);
2188         if (!port || !port->br)
2189                 goto unlock;
2190
2191         br = port->br;
2192
2193         memset(&eth, 0, sizeof(eth));
2194         eth.h_proto = htons(proto);
2195
2196         ret = br_multicast_querier_exists(br, &eth);
2197
2198 unlock:
2199         rcu_read_unlock();
2200         return ret;
2201 }
2202 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2203
2204 /**
2205  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2206  * @dev: The bridge port adjacent to which to check for a querier
2207  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2208  *
2209  * Checks whether the given interface has a bridge on top and if so returns
2210  * true if a selected querier is behind one of the other ports of this
2211  * bridge. Otherwise returns false.
2212  */
2213 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2214 {
2215         struct net_bridge *br;
2216         struct net_bridge_port *port;
2217         bool ret = false;
2218
2219         rcu_read_lock();
2220         if (!br_port_exists(dev))
2221                 goto unlock;
2222
2223         port = br_port_get_rcu(dev);
2224         if (!port || !port->br)
2225                 goto unlock;
2226
2227         br = port->br;
2228
2229         switch (proto) {
2230         case ETH_P_IP:
2231                 if (!timer_pending(&br->ip4_other_query.timer) ||
2232                     rcu_dereference(br->ip4_querier.port) == port)
2233                         goto unlock;
2234                 break;
2235 #if IS_ENABLED(CONFIG_IPV6)
2236         case ETH_P_IPV6:
2237                 if (!timer_pending(&br->ip6_other_query.timer) ||
2238                     rcu_dereference(br->ip6_querier.port) == port)
2239                         goto unlock;
2240                 break;
2241 #endif
2242         default:
2243                 goto unlock;
2244         }
2245
2246         ret = true;
2247 unlock:
2248         rcu_read_unlock();
2249         return ret;
2250 }
2251 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2252
2253 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2254                                const struct sk_buff *skb, u8 type, u8 dir)
2255 {
2256         struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2257         __be16 proto = skb->protocol;
2258         unsigned int t_len;
2259
2260         u64_stats_update_begin(&pstats->syncp);
2261         switch (proto) {
2262         case htons(ETH_P_IP):
2263                 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2264                 switch (type) {
2265                 case IGMP_HOST_MEMBERSHIP_REPORT:
2266                         pstats->mstats.igmp_v1reports[dir]++;
2267                         break;
2268                 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2269                         pstats->mstats.igmp_v2reports[dir]++;
2270                         break;
2271                 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2272                         pstats->mstats.igmp_v3reports[dir]++;
2273                         break;
2274                 case IGMP_HOST_MEMBERSHIP_QUERY:
2275                         if (t_len != sizeof(struct igmphdr)) {
2276                                 pstats->mstats.igmp_v3queries[dir]++;
2277                         } else {
2278                                 unsigned int offset = skb_transport_offset(skb);
2279                                 struct igmphdr *ih, _ihdr;
2280
2281                                 ih = skb_header_pointer(skb, offset,
2282                                                         sizeof(_ihdr), &_ihdr);
2283                                 if (!ih)
2284                                         break;
2285                                 if (!ih->code)
2286                                         pstats->mstats.igmp_v1queries[dir]++;
2287                                 else
2288                                         pstats->mstats.igmp_v2queries[dir]++;
2289                         }
2290                         break;
2291                 case IGMP_HOST_LEAVE_MESSAGE:
2292                         pstats->mstats.igmp_leaves[dir]++;
2293                         break;
2294                 }
2295                 break;
2296 #if IS_ENABLED(CONFIG_IPV6)
2297         case htons(ETH_P_IPV6):
2298                 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2299                         sizeof(struct ipv6hdr);
2300                 t_len -= skb_network_header_len(skb);
2301                 switch (type) {
2302                 case ICMPV6_MGM_REPORT:
2303                         pstats->mstats.mld_v1reports[dir]++;
2304                         break;
2305                 case ICMPV6_MLD2_REPORT:
2306                         pstats->mstats.mld_v2reports[dir]++;
2307                         break;
2308                 case ICMPV6_MGM_QUERY:
2309                         if (t_len != sizeof(struct mld_msg))
2310                                 pstats->mstats.mld_v2queries[dir]++;
2311                         else
2312                                 pstats->mstats.mld_v1queries[dir]++;
2313                         break;
2314                 case ICMPV6_MGM_REDUCTION:
2315                         pstats->mstats.mld_leaves[dir]++;
2316                         break;
2317                 }
2318                 break;
2319 #endif /* CONFIG_IPV6 */
2320         }
2321         u64_stats_update_end(&pstats->syncp);
2322 }
2323
2324 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2325                         const struct sk_buff *skb, u8 type, u8 dir)
2326 {
2327         struct bridge_mcast_stats __percpu *stats;
2328
2329         /* if multicast_disabled is true then igmp type can't be set */
2330         if (!type || !br->multicast_stats_enabled)
2331                 return;
2332
2333         if (p)
2334                 stats = p->mcast_stats;
2335         else
2336                 stats = br->mcast_stats;
2337         if (WARN_ON(!stats))
2338                 return;
2339
2340         br_mcast_stats_add(stats, skb, type, dir);
2341 }
2342
2343 int br_multicast_init_stats(struct net_bridge *br)
2344 {
2345         br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2346         if (!br->mcast_stats)
2347                 return -ENOMEM;
2348
2349         return 0;
2350 }
2351
2352 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2353 {
2354         dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2355         dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2356 }
2357
2358 void br_multicast_get_stats(const struct net_bridge *br,
2359                             const struct net_bridge_port *p,
2360                             struct br_mcast_stats *dest)
2361 {
2362         struct bridge_mcast_stats __percpu *stats;
2363         struct br_mcast_stats tdst;
2364         int i;
2365
2366         memset(dest, 0, sizeof(*dest));
2367         if (p)
2368                 stats = p->mcast_stats;
2369         else
2370                 stats = br->mcast_stats;
2371         if (WARN_ON(!stats))
2372                 return;
2373
2374         memset(&tdst, 0, sizeof(tdst));
2375         for_each_possible_cpu(i) {
2376                 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2377                 struct br_mcast_stats temp;
2378                 unsigned int start;
2379
2380                 do {
2381                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2382                         memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2383                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2384
2385                 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2386                 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2387                 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2388                 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2389                 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2390                 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2391                 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2392                 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2393
2394                 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2395                 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2396                 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2397                 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2398                 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2399                 tdst.mld_parse_errors += temp.mld_parse_errors;
2400         }
2401         memcpy(dest, &tdst, sizeof(*dest));
2402 }