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
1040         ih = igmpv3_report_hdr(skb);
1041         num = ntohs(ih->ngrec);
1042         len = skb_transport_offset(skb) + sizeof(*ih);
1043
1044         for (i = 0; i < num; i++) {
1045                 len += sizeof(*grec);
1046                 if (!pskb_may_pull(skb, len))
1047                         return -EINVAL;
1048
1049                 grec = (void *)(skb->data + len - sizeof(*grec));
1050                 group = grec->grec_mca;
1051                 type = grec->grec_type;
1052
1053                 len += ntohs(grec->grec_nsrcs) * 4;
1054                 if (!pskb_may_pull(skb, len))
1055                         return -EINVAL;
1056
1057                 /* We treat this as an IGMPv2 report for now. */
1058                 switch (type) {
1059                 case IGMPV3_MODE_IS_INCLUDE:
1060                 case IGMPV3_MODE_IS_EXCLUDE:
1061                 case IGMPV3_CHANGE_TO_INCLUDE:
1062                 case IGMPV3_CHANGE_TO_EXCLUDE:
1063                 case IGMPV3_ALLOW_NEW_SOURCES:
1064                 case IGMPV3_BLOCK_OLD_SOURCES:
1065                         break;
1066
1067                 default:
1068                         continue;
1069                 }
1070
1071                 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1072                      type == IGMPV3_MODE_IS_INCLUDE) &&
1073                     ntohs(grec->grec_nsrcs) == 0) {
1074                         br_ip4_multicast_leave_group(br, port, group, vid);
1075                 } else {
1076                         err = br_ip4_multicast_add_group(br, port, group, vid);
1077                         if (err)
1078                                 break;
1079                 }
1080         }
1081
1082         return err;
1083 }
1084
1085 #if IS_ENABLED(CONFIG_IPV6)
1086 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1087                                         struct net_bridge_port *port,
1088                                         struct sk_buff *skb,
1089                                         u16 vid)
1090 {
1091         struct icmp6hdr *icmp6h;
1092         struct mld2_grec *grec;
1093         int i;
1094         int len;
1095         int num;
1096         int err = 0;
1097
1098         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1099                 return -EINVAL;
1100
1101         icmp6h = icmp6_hdr(skb);
1102         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1103         len = skb_transport_offset(skb) + sizeof(*icmp6h);
1104
1105         for (i = 0; i < num; i++) {
1106                 __be16 *nsrcs, _nsrcs;
1107
1108                 nsrcs = skb_header_pointer(skb,
1109                                            len + offsetof(struct mld2_grec,
1110                                                           grec_nsrcs),
1111                                            sizeof(_nsrcs), &_nsrcs);
1112                 if (!nsrcs)
1113                         return -EINVAL;
1114
1115                 if (!pskb_may_pull(skb,
1116                                    len + sizeof(*grec) +
1117                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
1118                         return -EINVAL;
1119
1120                 grec = (struct mld2_grec *)(skb->data + len);
1121                 len += sizeof(*grec) +
1122                        sizeof(struct in6_addr) * ntohs(*nsrcs);
1123
1124                 /* We treat these as MLDv1 reports for now. */
1125                 switch (grec->grec_type) {
1126                 case MLD2_MODE_IS_INCLUDE:
1127                 case MLD2_MODE_IS_EXCLUDE:
1128                 case MLD2_CHANGE_TO_INCLUDE:
1129                 case MLD2_CHANGE_TO_EXCLUDE:
1130                 case MLD2_ALLOW_NEW_SOURCES:
1131                 case MLD2_BLOCK_OLD_SOURCES:
1132                         break;
1133
1134                 default:
1135                         continue;
1136                 }
1137
1138                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1139                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1140                     ntohs(*nsrcs) == 0) {
1141                         br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1142                                                      vid);
1143                 } else {
1144                         err = br_ip6_multicast_add_group(br, port,
1145                                                          &grec->grec_mca, vid);
1146                         if (err)
1147                                 break;
1148                 }
1149         }
1150
1151         return err;
1152 }
1153 #endif
1154
1155 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1156                                             struct net_bridge_port *port,
1157                                             __be32 saddr)
1158 {
1159         if (!timer_pending(&br->ip4_own_query.timer) &&
1160             !timer_pending(&br->ip4_other_query.timer))
1161                 goto update;
1162
1163         if (!br->ip4_querier.addr.u.ip4)
1164                 goto update;
1165
1166         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1167                 goto update;
1168
1169         return false;
1170
1171 update:
1172         br->ip4_querier.addr.u.ip4 = saddr;
1173
1174         /* update protected by general multicast_lock by caller */
1175         rcu_assign_pointer(br->ip4_querier.port, port);
1176
1177         return true;
1178 }
1179
1180 #if IS_ENABLED(CONFIG_IPV6)
1181 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1182                                             struct net_bridge_port *port,
1183                                             struct in6_addr *saddr)
1184 {
1185         if (!timer_pending(&br->ip6_own_query.timer) &&
1186             !timer_pending(&br->ip6_other_query.timer))
1187                 goto update;
1188
1189         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1190                 goto update;
1191
1192         return false;
1193
1194 update:
1195         br->ip6_querier.addr.u.ip6 = *saddr;
1196
1197         /* update protected by general multicast_lock by caller */
1198         rcu_assign_pointer(br->ip6_querier.port, port);
1199
1200         return true;
1201 }
1202 #endif
1203
1204 static bool br_multicast_select_querier(struct net_bridge *br,
1205                                         struct net_bridge_port *port,
1206                                         struct br_ip *saddr)
1207 {
1208         switch (saddr->proto) {
1209         case htons(ETH_P_IP):
1210                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1211 #if IS_ENABLED(CONFIG_IPV6)
1212         case htons(ETH_P_IPV6):
1213                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1214 #endif
1215         }
1216
1217         return false;
1218 }
1219
1220 static void
1221 br_multicast_update_query_timer(struct net_bridge *br,
1222                                 struct bridge_mcast_other_query *query,
1223                                 unsigned long max_delay)
1224 {
1225         if (!timer_pending(&query->timer))
1226                 query->delay_time = jiffies + max_delay;
1227
1228         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1229 }
1230
1231 /*
1232  * Add port to router_list
1233  *  list is maintained ordered by pointer value
1234  *  and locked by br->multicast_lock and RCU
1235  */
1236 static void br_multicast_add_router(struct net_bridge *br,
1237                                     struct net_bridge_port *port)
1238 {
1239         struct net_bridge_port *p;
1240         struct hlist_node *slot = NULL;
1241
1242         if (!hlist_unhashed(&port->rlist))
1243                 return;
1244
1245         hlist_for_each_entry(p, &br->router_list, rlist) {
1246                 if ((unsigned long) port >= (unsigned long) p)
1247                         break;
1248                 slot = &p->rlist;
1249         }
1250
1251         if (slot)
1252                 hlist_add_behind_rcu(&port->rlist, slot);
1253         else
1254                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1255         br_rtr_notify(br->dev, port, RTM_NEWMDB);
1256 }
1257
1258 static void br_multicast_mark_router(struct net_bridge *br,
1259                                      struct net_bridge_port *port)
1260 {
1261         unsigned long now = jiffies;
1262
1263         if (!port) {
1264                 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1265                         mod_timer(&br->multicast_router_timer,
1266                                   now + br->multicast_querier_interval);
1267                 return;
1268         }
1269
1270         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1271             port->multicast_router == MDB_RTR_TYPE_PERM)
1272                 return;
1273
1274         br_multicast_add_router(br, port);
1275
1276         mod_timer(&port->multicast_router_timer,
1277                   now + br->multicast_querier_interval);
1278 }
1279
1280 static void br_multicast_query_received(struct net_bridge *br,
1281                                         struct net_bridge_port *port,
1282                                         struct bridge_mcast_other_query *query,
1283                                         struct br_ip *saddr,
1284                                         unsigned long max_delay)
1285 {
1286         if (!br_multicast_select_querier(br, port, saddr))
1287                 return;
1288
1289         br_multicast_update_query_timer(br, query, max_delay);
1290         br_multicast_mark_router(br, port);
1291 }
1292
1293 static int br_ip4_multicast_query(struct net_bridge *br,
1294                                   struct net_bridge_port *port,
1295                                   struct sk_buff *skb,
1296                                   u16 vid)
1297 {
1298         const struct iphdr *iph = ip_hdr(skb);
1299         struct igmphdr *ih = igmp_hdr(skb);
1300         struct net_bridge_mdb_entry *mp;
1301         struct igmpv3_query *ih3;
1302         struct net_bridge_port_group *p;
1303         struct net_bridge_port_group __rcu **pp;
1304         struct br_ip saddr;
1305         unsigned long max_delay;
1306         unsigned long now = jiffies;
1307         unsigned int offset = skb_transport_offset(skb);
1308         __be32 group;
1309         int err = 0;
1310
1311         spin_lock(&br->multicast_lock);
1312         if (!netif_running(br->dev) ||
1313             (port && port->state == BR_STATE_DISABLED))
1314                 goto out;
1315
1316         group = ih->group;
1317
1318         if (skb->len == offset + sizeof(*ih)) {
1319                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1320
1321                 if (!max_delay) {
1322                         max_delay = 10 * HZ;
1323                         group = 0;
1324                 }
1325         } else if (skb->len >= offset + sizeof(*ih3)) {
1326                 ih3 = igmpv3_query_hdr(skb);
1327                 if (ih3->nsrcs)
1328                         goto out;
1329
1330                 max_delay = ih3->code ?
1331                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1332         } else {
1333                 goto out;
1334         }
1335
1336         if (!group) {
1337                 saddr.proto = htons(ETH_P_IP);
1338                 saddr.u.ip4 = iph->saddr;
1339
1340                 br_multicast_query_received(br, port, &br->ip4_other_query,
1341                                             &saddr, max_delay);
1342                 goto out;
1343         }
1344
1345         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1346         if (!mp)
1347                 goto out;
1348
1349         max_delay *= br->multicast_last_member_count;
1350
1351         if (mp->mglist &&
1352             (timer_pending(&mp->timer) ?
1353              time_after(mp->timer.expires, now + max_delay) :
1354              try_to_del_timer_sync(&mp->timer) >= 0))
1355                 mod_timer(&mp->timer, now + max_delay);
1356
1357         for (pp = &mp->ports;
1358              (p = mlock_dereference(*pp, br)) != NULL;
1359              pp = &p->next) {
1360                 if (timer_pending(&p->timer) ?
1361                     time_after(p->timer.expires, now + max_delay) :
1362                     try_to_del_timer_sync(&p->timer) >= 0)
1363                         mod_timer(&p->timer, now + max_delay);
1364         }
1365
1366 out:
1367         spin_unlock(&br->multicast_lock);
1368         return err;
1369 }
1370
1371 #if IS_ENABLED(CONFIG_IPV6)
1372 static int br_ip6_multicast_query(struct net_bridge *br,
1373                                   struct net_bridge_port *port,
1374                                   struct sk_buff *skb,
1375                                   u16 vid)
1376 {
1377         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1378         struct mld_msg *mld;
1379         struct net_bridge_mdb_entry *mp;
1380         struct mld2_query *mld2q;
1381         struct net_bridge_port_group *p;
1382         struct net_bridge_port_group __rcu **pp;
1383         struct br_ip saddr;
1384         unsigned long max_delay;
1385         unsigned long now = jiffies;
1386         unsigned int offset = skb_transport_offset(skb);
1387         const struct in6_addr *group = NULL;
1388         bool is_general_query;
1389         int err = 0;
1390
1391         spin_lock(&br->multicast_lock);
1392         if (!netif_running(br->dev) ||
1393             (port && port->state == BR_STATE_DISABLED))
1394                 goto out;
1395
1396         if (skb->len == offset + sizeof(*mld)) {
1397                 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1398                         err = -EINVAL;
1399                         goto out;
1400                 }
1401                 mld = (struct mld_msg *) icmp6_hdr(skb);
1402                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1403                 if (max_delay)
1404                         group = &mld->mld_mca;
1405         } else {
1406                 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1407                         err = -EINVAL;
1408                         goto out;
1409                 }
1410                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1411                 if (!mld2q->mld2q_nsrcs)
1412                         group = &mld2q->mld2q_mca;
1413
1414                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1415         }
1416
1417         is_general_query = group && ipv6_addr_any(group);
1418
1419         if (is_general_query) {
1420                 saddr.proto = htons(ETH_P_IPV6);
1421                 saddr.u.ip6 = ip6h->saddr;
1422
1423                 br_multicast_query_received(br, port, &br->ip6_other_query,
1424                                             &saddr, max_delay);
1425                 goto out;
1426         } else if (!group) {
1427                 goto out;
1428         }
1429
1430         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1431         if (!mp)
1432                 goto out;
1433
1434         max_delay *= br->multicast_last_member_count;
1435         if (mp->mglist &&
1436             (timer_pending(&mp->timer) ?
1437              time_after(mp->timer.expires, now + max_delay) :
1438              try_to_del_timer_sync(&mp->timer) >= 0))
1439                 mod_timer(&mp->timer, now + max_delay);
1440
1441         for (pp = &mp->ports;
1442              (p = mlock_dereference(*pp, br)) != NULL;
1443              pp = &p->next) {
1444                 if (timer_pending(&p->timer) ?
1445                     time_after(p->timer.expires, now + max_delay) :
1446                     try_to_del_timer_sync(&p->timer) >= 0)
1447                         mod_timer(&p->timer, now + max_delay);
1448         }
1449
1450 out:
1451         spin_unlock(&br->multicast_lock);
1452         return err;
1453 }
1454 #endif
1455
1456 static void
1457 br_multicast_leave_group(struct net_bridge *br,
1458                          struct net_bridge_port *port,
1459                          struct br_ip *group,
1460                          struct bridge_mcast_other_query *other_query,
1461                          struct bridge_mcast_own_query *own_query)
1462 {
1463         struct net_bridge_mdb_htable *mdb;
1464         struct net_bridge_mdb_entry *mp;
1465         struct net_bridge_port_group *p;
1466         unsigned long now;
1467         unsigned long time;
1468
1469         spin_lock(&br->multicast_lock);
1470         if (!netif_running(br->dev) ||
1471             (port && port->state == BR_STATE_DISABLED))
1472                 goto out;
1473
1474         mdb = mlock_dereference(br->mdb, br);
1475         mp = br_mdb_ip_get(mdb, group);
1476         if (!mp)
1477                 goto out;
1478
1479         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1480                 struct net_bridge_port_group __rcu **pp;
1481
1482                 for (pp = &mp->ports;
1483                      (p = mlock_dereference(*pp, br)) != NULL;
1484                      pp = &p->next) {
1485                         if (p->port != port)
1486                                 continue;
1487
1488                         rcu_assign_pointer(*pp, p->next);
1489                         hlist_del_init(&p->mglist);
1490                         del_timer(&p->timer);
1491                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1492                         br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1493                                       p->flags);
1494
1495                         if (!mp->ports && !mp->mglist &&
1496                             netif_running(br->dev))
1497                                 mod_timer(&mp->timer, jiffies);
1498                 }
1499                 goto out;
1500         }
1501
1502         if (timer_pending(&other_query->timer))
1503                 goto out;
1504
1505         if (br->multicast_querier) {
1506                 __br_multicast_send_query(br, port, &mp->addr);
1507
1508                 time = jiffies + br->multicast_last_member_count *
1509                                  br->multicast_last_member_interval;
1510
1511                 mod_timer(&own_query->timer, time);
1512
1513                 for (p = mlock_dereference(mp->ports, br);
1514                      p != NULL;
1515                      p = mlock_dereference(p->next, br)) {
1516                         if (p->port != port)
1517                                 continue;
1518
1519                         if (!hlist_unhashed(&p->mglist) &&
1520                             (timer_pending(&p->timer) ?
1521                              time_after(p->timer.expires, time) :
1522                              try_to_del_timer_sync(&p->timer) >= 0)) {
1523                                 mod_timer(&p->timer, time);
1524                         }
1525
1526                         break;
1527                 }
1528         }
1529
1530         now = jiffies;
1531         time = now + br->multicast_last_member_count *
1532                      br->multicast_last_member_interval;
1533
1534         if (!port) {
1535                 if (mp->mglist &&
1536                     (timer_pending(&mp->timer) ?
1537                      time_after(mp->timer.expires, time) :
1538                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1539                         mod_timer(&mp->timer, time);
1540                 }
1541
1542                 goto out;
1543         }
1544
1545         for (p = mlock_dereference(mp->ports, br);
1546              p != NULL;
1547              p = mlock_dereference(p->next, br)) {
1548                 if (p->port != port)
1549                         continue;
1550
1551                 if (!hlist_unhashed(&p->mglist) &&
1552                     (timer_pending(&p->timer) ?
1553                      time_after(p->timer.expires, time) :
1554                      try_to_del_timer_sync(&p->timer) >= 0)) {
1555                         mod_timer(&p->timer, time);
1556                 }
1557
1558                 break;
1559         }
1560 out:
1561         spin_unlock(&br->multicast_lock);
1562 }
1563
1564 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1565                                          struct net_bridge_port *port,
1566                                          __be32 group,
1567                                          __u16 vid)
1568 {
1569         struct br_ip br_group;
1570         struct bridge_mcast_own_query *own_query;
1571
1572         if (ipv4_is_local_multicast(group))
1573                 return;
1574
1575         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1576
1577         br_group.u.ip4 = group;
1578         br_group.proto = htons(ETH_P_IP);
1579         br_group.vid = vid;
1580
1581         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1582                                  own_query);
1583 }
1584
1585 #if IS_ENABLED(CONFIG_IPV6)
1586 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1587                                          struct net_bridge_port *port,
1588                                          const struct in6_addr *group,
1589                                          __u16 vid)
1590 {
1591         struct br_ip br_group;
1592         struct bridge_mcast_own_query *own_query;
1593
1594         if (ipv6_addr_is_ll_all_nodes(group))
1595                 return;
1596
1597         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1598
1599         br_group.u.ip6 = *group;
1600         br_group.proto = htons(ETH_P_IPV6);
1601         br_group.vid = vid;
1602
1603         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1604                                  own_query);
1605 }
1606 #endif
1607
1608 static void br_multicast_err_count(const struct net_bridge *br,
1609                                    const struct net_bridge_port *p,
1610                                    __be16 proto)
1611 {
1612         struct bridge_mcast_stats __percpu *stats;
1613         struct bridge_mcast_stats *pstats;
1614
1615         if (!br->multicast_stats_enabled)
1616                 return;
1617
1618         if (p)
1619                 stats = p->mcast_stats;
1620         else
1621                 stats = br->mcast_stats;
1622         if (WARN_ON(!stats))
1623                 return;
1624
1625         pstats = this_cpu_ptr(stats);
1626
1627         u64_stats_update_begin(&pstats->syncp);
1628         switch (proto) {
1629         case htons(ETH_P_IP):
1630                 pstats->mstats.igmp_parse_errors++;
1631                 break;
1632 #if IS_ENABLED(CONFIG_IPV6)
1633         case htons(ETH_P_IPV6):
1634                 pstats->mstats.mld_parse_errors++;
1635                 break;
1636 #endif
1637         }
1638         u64_stats_update_end(&pstats->syncp);
1639 }
1640
1641 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1642                                  struct net_bridge_port *port,
1643                                  struct sk_buff *skb,
1644                                  u16 vid)
1645 {
1646         struct sk_buff *skb_trimmed = NULL;
1647         struct igmphdr *ih;
1648         int err;
1649
1650         err = ip_mc_check_igmp(skb, &skb_trimmed);
1651
1652         if (err == -ENOMSG) {
1653                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1654                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1655                 return 0;
1656         } else if (err < 0) {
1657                 br_multicast_err_count(br, port, skb->protocol);
1658                 return err;
1659         }
1660
1661         ih = igmp_hdr(skb);
1662         BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1663
1664         switch (ih->type) {
1665         case IGMP_HOST_MEMBERSHIP_REPORT:
1666         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1667                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1668                 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1669                 break;
1670         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1671                 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1672                 break;
1673         case IGMP_HOST_MEMBERSHIP_QUERY:
1674                 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1675                 break;
1676         case IGMP_HOST_LEAVE_MESSAGE:
1677                 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1678                 break;
1679         }
1680
1681         if (skb_trimmed && skb_trimmed != skb)
1682                 kfree_skb(skb_trimmed);
1683
1684         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1685                            BR_MCAST_DIR_RX);
1686
1687         return err;
1688 }
1689
1690 #if IS_ENABLED(CONFIG_IPV6)
1691 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1692                                  struct net_bridge_port *port,
1693                                  struct sk_buff *skb,
1694                                  u16 vid)
1695 {
1696         struct sk_buff *skb_trimmed = NULL;
1697         struct mld_msg *mld;
1698         int err;
1699
1700         err = ipv6_mc_check_mld(skb, &skb_trimmed);
1701
1702         if (err == -ENOMSG) {
1703                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1704                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1705                 return 0;
1706         } else if (err < 0) {
1707                 br_multicast_err_count(br, port, skb->protocol);
1708                 return err;
1709         }
1710
1711         mld = (struct mld_msg *)skb_transport_header(skb);
1712         BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1713
1714         switch (mld->mld_type) {
1715         case ICMPV6_MGM_REPORT:
1716                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1717                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1718                 break;
1719         case ICMPV6_MLD2_REPORT:
1720                 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1721                 break;
1722         case ICMPV6_MGM_QUERY:
1723                 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1724                 break;
1725         case ICMPV6_MGM_REDUCTION:
1726                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1727                 break;
1728         }
1729
1730         if (skb_trimmed && skb_trimmed != skb)
1731                 kfree_skb(skb_trimmed);
1732
1733         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1734                            BR_MCAST_DIR_RX);
1735
1736         return err;
1737 }
1738 #endif
1739
1740 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1741                      struct sk_buff *skb, u16 vid)
1742 {
1743         int ret = 0;
1744
1745         BR_INPUT_SKB_CB(skb)->igmp = 0;
1746         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1747
1748         if (br->multicast_disabled)
1749                 return 0;
1750
1751         switch (skb->protocol) {
1752         case htons(ETH_P_IP):
1753                 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1754                 break;
1755 #if IS_ENABLED(CONFIG_IPV6)
1756         case htons(ETH_P_IPV6):
1757                 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1758                 break;
1759 #endif
1760         }
1761
1762         return ret;
1763 }
1764
1765 static void br_multicast_query_expired(struct net_bridge *br,
1766                                        struct bridge_mcast_own_query *query,
1767                                        struct bridge_mcast_querier *querier)
1768 {
1769         spin_lock(&br->multicast_lock);
1770         if (query->startup_sent < br->multicast_startup_query_count)
1771                 query->startup_sent++;
1772
1773         RCU_INIT_POINTER(querier->port, NULL);
1774         br_multicast_send_query(br, NULL, query);
1775         spin_unlock(&br->multicast_lock);
1776 }
1777
1778 static void br_ip4_multicast_query_expired(unsigned long data)
1779 {
1780         struct net_bridge *br = (void *)data;
1781
1782         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1783 }
1784
1785 #if IS_ENABLED(CONFIG_IPV6)
1786 static void br_ip6_multicast_query_expired(unsigned long data)
1787 {
1788         struct net_bridge *br = (void *)data;
1789
1790         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1791 }
1792 #endif
1793
1794 void br_multicast_init(struct net_bridge *br)
1795 {
1796         br->hash_elasticity = 4;
1797         br->hash_max = 512;
1798
1799         br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1800         br->multicast_querier = 0;
1801         br->multicast_query_use_ifaddr = 0;
1802         br->multicast_last_member_count = 2;
1803         br->multicast_startup_query_count = 2;
1804
1805         br->multicast_last_member_interval = HZ;
1806         br->multicast_query_response_interval = 10 * HZ;
1807         br->multicast_startup_query_interval = 125 * HZ / 4;
1808         br->multicast_query_interval = 125 * HZ;
1809         br->multicast_querier_interval = 255 * HZ;
1810         br->multicast_membership_interval = 260 * HZ;
1811
1812         br->ip4_other_query.delay_time = 0;
1813         br->ip4_querier.port = NULL;
1814 #if IS_ENABLED(CONFIG_IPV6)
1815         br->ip6_other_query.delay_time = 0;
1816         br->ip6_querier.port = NULL;
1817 #endif
1818         br->has_ipv6_addr = 1;
1819
1820         spin_lock_init(&br->multicast_lock);
1821         setup_timer(&br->multicast_router_timer,
1822                     br_multicast_local_router_expired, 0);
1823         setup_timer(&br->ip4_other_query.timer,
1824                     br_ip4_multicast_querier_expired, (unsigned long)br);
1825         setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1826                     (unsigned long)br);
1827 #if IS_ENABLED(CONFIG_IPV6)
1828         setup_timer(&br->ip6_other_query.timer,
1829                     br_ip6_multicast_querier_expired, (unsigned long)br);
1830         setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1831                     (unsigned long)br);
1832 #endif
1833 }
1834
1835 static void __br_multicast_open(struct net_bridge *br,
1836                                 struct bridge_mcast_own_query *query)
1837 {
1838         query->startup_sent = 0;
1839
1840         if (br->multicast_disabled)
1841                 return;
1842
1843         mod_timer(&query->timer, jiffies);
1844 }
1845
1846 void br_multicast_open(struct net_bridge *br)
1847 {
1848         __br_multicast_open(br, &br->ip4_own_query);
1849 #if IS_ENABLED(CONFIG_IPV6)
1850         __br_multicast_open(br, &br->ip6_own_query);
1851 #endif
1852 }
1853
1854 void br_multicast_stop(struct net_bridge *br)
1855 {
1856         del_timer_sync(&br->multicast_router_timer);
1857         del_timer_sync(&br->ip4_other_query.timer);
1858         del_timer_sync(&br->ip4_own_query.timer);
1859 #if IS_ENABLED(CONFIG_IPV6)
1860         del_timer_sync(&br->ip6_other_query.timer);
1861         del_timer_sync(&br->ip6_own_query.timer);
1862 #endif
1863 }
1864
1865 void br_multicast_dev_del(struct net_bridge *br)
1866 {
1867         struct net_bridge_mdb_htable *mdb;
1868         struct net_bridge_mdb_entry *mp;
1869         struct hlist_node *n;
1870         u32 ver;
1871         int i;
1872
1873         spin_lock_bh(&br->multicast_lock);
1874         mdb = mlock_dereference(br->mdb, br);
1875         if (!mdb)
1876                 goto out;
1877
1878         br->mdb = NULL;
1879
1880         ver = mdb->ver;
1881         for (i = 0; i < mdb->max; i++) {
1882                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1883                                           hlist[ver]) {
1884                         del_timer(&mp->timer);
1885                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
1886                 }
1887         }
1888
1889         if (mdb->old) {
1890                 spin_unlock_bh(&br->multicast_lock);
1891                 rcu_barrier_bh();
1892                 spin_lock_bh(&br->multicast_lock);
1893                 WARN_ON(mdb->old);
1894         }
1895
1896         mdb->old = mdb;
1897         call_rcu_bh(&mdb->rcu, br_mdb_free);
1898
1899 out:
1900         spin_unlock_bh(&br->multicast_lock);
1901
1902         free_percpu(br->mcast_stats);
1903 }
1904
1905 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1906 {
1907         int err = -EINVAL;
1908
1909         spin_lock_bh(&br->multicast_lock);
1910
1911         switch (val) {
1912         case MDB_RTR_TYPE_DISABLED:
1913         case MDB_RTR_TYPE_PERM:
1914                 del_timer(&br->multicast_router_timer);
1915                 /* fall through */
1916         case MDB_RTR_TYPE_TEMP_QUERY:
1917                 br->multicast_router = val;
1918                 err = 0;
1919                 break;
1920         }
1921
1922         spin_unlock_bh(&br->multicast_lock);
1923
1924         return err;
1925 }
1926
1927 static void __del_port_router(struct net_bridge_port *p)
1928 {
1929         if (hlist_unhashed(&p->rlist))
1930                 return;
1931         hlist_del_init_rcu(&p->rlist);
1932         br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1933 }
1934
1935 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1936 {
1937         struct net_bridge *br = p->br;
1938         unsigned long now = jiffies;
1939         int err = -EINVAL;
1940
1941         spin_lock(&br->multicast_lock);
1942         if (p->multicast_router == val) {
1943                 /* Refresh the temp router port timer */
1944                 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1945                         mod_timer(&p->multicast_router_timer,
1946                                   now + br->multicast_querier_interval);
1947                 err = 0;
1948                 goto unlock;
1949         }
1950         switch (val) {
1951         case MDB_RTR_TYPE_DISABLED:
1952                 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1953                 __del_port_router(p);
1954                 del_timer(&p->multicast_router_timer);
1955                 break;
1956         case MDB_RTR_TYPE_TEMP_QUERY:
1957                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1958                 __del_port_router(p);
1959                 break;
1960         case MDB_RTR_TYPE_PERM:
1961                 p->multicast_router = MDB_RTR_TYPE_PERM;
1962                 del_timer(&p->multicast_router_timer);
1963                 br_multicast_add_router(br, p);
1964                 break;
1965         case MDB_RTR_TYPE_TEMP:
1966                 p->multicast_router = MDB_RTR_TYPE_TEMP;
1967                 br_multicast_mark_router(br, p);
1968                 break;
1969         default:
1970                 goto unlock;
1971         }
1972         err = 0;
1973 unlock:
1974         spin_unlock(&br->multicast_lock);
1975
1976         return err;
1977 }
1978
1979 static void br_multicast_start_querier(struct net_bridge *br,
1980                                        struct bridge_mcast_own_query *query)
1981 {
1982         struct net_bridge_port *port;
1983
1984         __br_multicast_open(br, query);
1985
1986         list_for_each_entry(port, &br->port_list, list) {
1987                 if (port->state == BR_STATE_DISABLED ||
1988                     port->state == BR_STATE_BLOCKING)
1989                         continue;
1990
1991                 if (query == &br->ip4_own_query)
1992                         br_multicast_enable(&port->ip4_own_query);
1993 #if IS_ENABLED(CONFIG_IPV6)
1994                 else
1995                         br_multicast_enable(&port->ip6_own_query);
1996 #endif
1997         }
1998 }
1999
2000 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2001 {
2002         struct net_bridge_mdb_htable *mdb;
2003         struct net_bridge_port *port;
2004         int err = 0;
2005
2006         spin_lock_bh(&br->multicast_lock);
2007         if (br->multicast_disabled == !val)
2008                 goto unlock;
2009
2010         br->multicast_disabled = !val;
2011         if (br->multicast_disabled)
2012                 goto unlock;
2013
2014         if (!netif_running(br->dev))
2015                 goto unlock;
2016
2017         mdb = mlock_dereference(br->mdb, br);
2018         if (mdb) {
2019                 if (mdb->old) {
2020                         err = -EEXIST;
2021 rollback:
2022                         br->multicast_disabled = !!val;
2023                         goto unlock;
2024                 }
2025
2026                 err = br_mdb_rehash(&br->mdb, mdb->max,
2027                                     br->hash_elasticity);
2028                 if (err)
2029                         goto rollback;
2030         }
2031
2032         br_multicast_open(br);
2033         list_for_each_entry(port, &br->port_list, list)
2034                 __br_multicast_enable_port(port);
2035
2036 unlock:
2037         spin_unlock_bh(&br->multicast_lock);
2038
2039         return err;
2040 }
2041
2042 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2043 {
2044         unsigned long max_delay;
2045
2046         val = !!val;
2047
2048         spin_lock_bh(&br->multicast_lock);
2049         if (br->multicast_querier == val)
2050                 goto unlock;
2051
2052         br->multicast_querier = val;
2053         if (!val)
2054                 goto unlock;
2055
2056         max_delay = br->multicast_query_response_interval;
2057
2058         if (!timer_pending(&br->ip4_other_query.timer))
2059                 br->ip4_other_query.delay_time = jiffies + max_delay;
2060
2061         br_multicast_start_querier(br, &br->ip4_own_query);
2062
2063 #if IS_ENABLED(CONFIG_IPV6)
2064         if (!timer_pending(&br->ip6_other_query.timer))
2065                 br->ip6_other_query.delay_time = jiffies + max_delay;
2066
2067         br_multicast_start_querier(br, &br->ip6_own_query);
2068 #endif
2069
2070 unlock:
2071         spin_unlock_bh(&br->multicast_lock);
2072
2073         return 0;
2074 }
2075
2076 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2077 {
2078         int err = -EINVAL;
2079         u32 old;
2080         struct net_bridge_mdb_htable *mdb;
2081
2082         spin_lock_bh(&br->multicast_lock);
2083         if (!is_power_of_2(val))
2084                 goto unlock;
2085
2086         mdb = mlock_dereference(br->mdb, br);
2087         if (mdb && val < mdb->size)
2088                 goto unlock;
2089
2090         err = 0;
2091
2092         old = br->hash_max;
2093         br->hash_max = val;
2094
2095         if (mdb) {
2096                 if (mdb->old) {
2097                         err = -EEXIST;
2098 rollback:
2099                         br->hash_max = old;
2100                         goto unlock;
2101                 }
2102
2103                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2104                                     br->hash_elasticity);
2105                 if (err)
2106                         goto rollback;
2107         }
2108
2109 unlock:
2110         spin_unlock_bh(&br->multicast_lock);
2111
2112         return err;
2113 }
2114
2115 /**
2116  * br_multicast_list_adjacent - Returns snooped multicast addresses
2117  * @dev:        The bridge port adjacent to which to retrieve addresses
2118  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2119  *
2120  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2121  * snooping feature on all bridge ports of dev's bridge device, excluding
2122  * the addresses from dev itself.
2123  *
2124  * Returns the number of items added to br_ip_list.
2125  *
2126  * Notes:
2127  * - br_ip_list needs to be initialized by caller
2128  * - br_ip_list might contain duplicates in the end
2129  *   (needs to be taken care of by caller)
2130  * - br_ip_list needs to be freed by caller
2131  */
2132 int br_multicast_list_adjacent(struct net_device *dev,
2133                                struct list_head *br_ip_list)
2134 {
2135         struct net_bridge *br;
2136         struct net_bridge_port *port;
2137         struct net_bridge_port_group *group;
2138         struct br_ip_list *entry;
2139         int count = 0;
2140
2141         rcu_read_lock();
2142         if (!br_ip_list || !br_port_exists(dev))
2143                 goto unlock;
2144
2145         port = br_port_get_rcu(dev);
2146         if (!port || !port->br)
2147                 goto unlock;
2148
2149         br = port->br;
2150
2151         list_for_each_entry_rcu(port, &br->port_list, list) {
2152                 if (!port->dev || port->dev == dev)
2153                         continue;
2154
2155                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2156                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2157                         if (!entry)
2158                                 goto unlock;
2159
2160                         entry->addr = group->addr;
2161                         list_add(&entry->list, br_ip_list);
2162                         count++;
2163                 }
2164         }
2165
2166 unlock:
2167         rcu_read_unlock();
2168         return count;
2169 }
2170 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2171
2172 /**
2173  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2174  * @dev: The bridge port providing the bridge on which to check for a querier
2175  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2176  *
2177  * Checks whether the given interface has a bridge on top and if so returns
2178  * true if a valid querier exists anywhere on the bridged link layer.
2179  * Otherwise returns false.
2180  */
2181 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2182 {
2183         struct net_bridge *br;
2184         struct net_bridge_port *port;
2185         struct ethhdr eth;
2186         bool ret = false;
2187
2188         rcu_read_lock();
2189         if (!br_port_exists(dev))
2190                 goto unlock;
2191
2192         port = br_port_get_rcu(dev);
2193         if (!port || !port->br)
2194                 goto unlock;
2195
2196         br = port->br;
2197
2198         memset(&eth, 0, sizeof(eth));
2199         eth.h_proto = htons(proto);
2200
2201         ret = br_multicast_querier_exists(br, &eth);
2202
2203 unlock:
2204         rcu_read_unlock();
2205         return ret;
2206 }
2207 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2208
2209 /**
2210  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2211  * @dev: The bridge port adjacent to which to check for a querier
2212  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2213  *
2214  * Checks whether the given interface has a bridge on top and if so returns
2215  * true if a selected querier is behind one of the other ports of this
2216  * bridge. Otherwise returns false.
2217  */
2218 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2219 {
2220         struct net_bridge *br;
2221         struct net_bridge_port *port;
2222         bool ret = false;
2223
2224         rcu_read_lock();
2225         if (!br_port_exists(dev))
2226                 goto unlock;
2227
2228         port = br_port_get_rcu(dev);
2229         if (!port || !port->br)
2230                 goto unlock;
2231
2232         br = port->br;
2233
2234         switch (proto) {
2235         case ETH_P_IP:
2236                 if (!timer_pending(&br->ip4_other_query.timer) ||
2237                     rcu_dereference(br->ip4_querier.port) == port)
2238                         goto unlock;
2239                 break;
2240 #if IS_ENABLED(CONFIG_IPV6)
2241         case ETH_P_IPV6:
2242                 if (!timer_pending(&br->ip6_other_query.timer) ||
2243                     rcu_dereference(br->ip6_querier.port) == port)
2244                         goto unlock;
2245                 break;
2246 #endif
2247         default:
2248                 goto unlock;
2249         }
2250
2251         ret = true;
2252 unlock:
2253         rcu_read_unlock();
2254         return ret;
2255 }
2256 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2257
2258 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2259                                const struct sk_buff *skb, u8 type, u8 dir)
2260 {
2261         struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2262         __be16 proto = skb->protocol;
2263         unsigned int t_len;
2264
2265         u64_stats_update_begin(&pstats->syncp);
2266         switch (proto) {
2267         case htons(ETH_P_IP):
2268                 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2269                 switch (type) {
2270                 case IGMP_HOST_MEMBERSHIP_REPORT:
2271                         pstats->mstats.igmp_v1reports[dir]++;
2272                         break;
2273                 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2274                         pstats->mstats.igmp_v2reports[dir]++;
2275                         break;
2276                 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2277                         pstats->mstats.igmp_v3reports[dir]++;
2278                         break;
2279                 case IGMP_HOST_MEMBERSHIP_QUERY:
2280                         if (t_len != sizeof(struct igmphdr)) {
2281                                 pstats->mstats.igmp_v3queries[dir]++;
2282                         } else {
2283                                 unsigned int offset = skb_transport_offset(skb);
2284                                 struct igmphdr *ih, _ihdr;
2285
2286                                 ih = skb_header_pointer(skb, offset,
2287                                                         sizeof(_ihdr), &_ihdr);
2288                                 if (!ih)
2289                                         break;
2290                                 if (!ih->code)
2291                                         pstats->mstats.igmp_v1queries[dir]++;
2292                                 else
2293                                         pstats->mstats.igmp_v2queries[dir]++;
2294                         }
2295                         break;
2296                 case IGMP_HOST_LEAVE_MESSAGE:
2297                         pstats->mstats.igmp_leaves[dir]++;
2298                         break;
2299                 }
2300                 break;
2301 #if IS_ENABLED(CONFIG_IPV6)
2302         case htons(ETH_P_IPV6):
2303                 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2304                         sizeof(struct ipv6hdr);
2305                 t_len -= skb_network_header_len(skb);
2306                 switch (type) {
2307                 case ICMPV6_MGM_REPORT:
2308                         pstats->mstats.mld_v1reports[dir]++;
2309                         break;
2310                 case ICMPV6_MLD2_REPORT:
2311                         pstats->mstats.mld_v2reports[dir]++;
2312                         break;
2313                 case ICMPV6_MGM_QUERY:
2314                         if (t_len != sizeof(struct mld_msg))
2315                                 pstats->mstats.mld_v2queries[dir]++;
2316                         else
2317                                 pstats->mstats.mld_v1queries[dir]++;
2318                         break;
2319                 case ICMPV6_MGM_REDUCTION:
2320                         pstats->mstats.mld_leaves[dir]++;
2321                         break;
2322                 }
2323                 break;
2324 #endif /* CONFIG_IPV6 */
2325         }
2326         u64_stats_update_end(&pstats->syncp);
2327 }
2328
2329 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2330                         const struct sk_buff *skb, u8 type, u8 dir)
2331 {
2332         struct bridge_mcast_stats __percpu *stats;
2333
2334         /* if multicast_disabled is true then igmp type can't be set */
2335         if (!type || !br->multicast_stats_enabled)
2336                 return;
2337
2338         if (p)
2339                 stats = p->mcast_stats;
2340         else
2341                 stats = br->mcast_stats;
2342         if (WARN_ON(!stats))
2343                 return;
2344
2345         br_mcast_stats_add(stats, skb, type, dir);
2346 }
2347
2348 int br_multicast_init_stats(struct net_bridge *br)
2349 {
2350         br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2351         if (!br->mcast_stats)
2352                 return -ENOMEM;
2353
2354         return 0;
2355 }
2356
2357 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2358 {
2359         dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2360         dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2361 }
2362
2363 void br_multicast_get_stats(const struct net_bridge *br,
2364                             const struct net_bridge_port *p,
2365                             struct br_mcast_stats *dest)
2366 {
2367         struct bridge_mcast_stats __percpu *stats;
2368         struct br_mcast_stats tdst;
2369         int i;
2370
2371         memset(dest, 0, sizeof(*dest));
2372         if (p)
2373                 stats = p->mcast_stats;
2374         else
2375                 stats = br->mcast_stats;
2376         if (WARN_ON(!stats))
2377                 return;
2378
2379         memset(&tdst, 0, sizeof(tdst));
2380         for_each_possible_cpu(i) {
2381                 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2382                 struct br_mcast_stats temp;
2383                 unsigned int start;
2384
2385                 do {
2386                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2387                         memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2388                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2389
2390                 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2391                 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2392                 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2393                 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2394                 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2395                 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2396                 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2397                 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2398
2399                 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2400                 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2401                 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2402                 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2403                 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2404                 tdst.mld_parse_errors += temp.mld_parse_errors;
2405         }
2406         memcpy(dest, &tdst, sizeof(*dest));
2407 }