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/if_ether.h>
  15 #include <linux/igmp.h>
  16 #include <linux/jhash.h>
  17 #include <linux/kernel.h>
  18 #include <linux/log2.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/netfilter_bridge.h>
  21 #include <linux/random.h>
  22 #include <linux/rculist.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/slab.h>
  25 #include <linux/timer.h>
  26 #include <linux/inetdevice.h>
  27 #include <net/ip.h>
  28 #if IS_ENABLED(CONFIG_IPV6)
  29 #include <net/ipv6.h>
  30 #include <net/mld.h>
  31 #include <net/ip6_checksum.h>
  32 #include <net/addrconf.h>
  33 #endif
  34
  35 #include "br_private.h"
  36
  37 static void br_multicast_start_querier(struct net_bridge *br,
  38                                        struct bridge_mcast_own_query *query);
  39 unsigned int br_mdb_rehash_seq;
  40
  41 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
  42 {
  43         if (a->proto != b->proto)
  44                 return 0;
  45         if (a->vid != b->vid)
  46                 return 0;
  47         switch (a->proto) {
  48         case htons(ETH_P_IP):
  49                 return a->u.ip4 == b->u.ip4;
  50 #if IS_ENABLED(CONFIG_IPV6)
  51         case htons(ETH_P_IPV6):
  52                 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
  53 #endif
  54         }
  55         return 0;
  56 }
  57
  58 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
  59                                 __u16 vid)
  60 {
  61         return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
  62 }
  63
  64 #if IS_ENABLED(CONFIG_IPV6)
  65 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
  66                                 const struct in6_addr *ip,
  67                                 __u16 vid)
  68 {
  69         return jhash_2words(ipv6_addr_hash(ip), vid,
  70                             mdb->secret) & (mdb->max - 1);
  71 }
  72 #endif
  73
  74 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
  75                              struct br_ip *ip)
  76 {
  77         switch (ip->proto) {
  78         case htons(ETH_P_IP):
  79                 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
  80 #if IS_ENABLED(CONFIG_IPV6)
  81         case htons(ETH_P_IPV6):
  82                 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
  83 #endif
  84         }
  85         return 0;
  86 }
  87
  88 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
  89         struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
  90 {
  91         struct net_bridge_mdb_entry *mp;
  92
  93         hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
  94                 if (br_ip_equal(&mp->addr, dst))
  95                         return mp;
  96         }
  97
  98         return NULL;
  99 }
 100
 101 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
 102                                            struct br_ip *dst)
 103 {
 104         if (!mdb)
 105                 return NULL;
 106
 107         return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
 108 }
 109
 110 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
 111         struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
 112 {
 113         struct br_ip br_dst;
 114
 115         br_dst.u.ip4 = dst;
 116         br_dst.proto = htons(ETH_P_IP);
 117         br_dst.vid = vid;
 118
 119         return br_mdb_ip_get(mdb, &br_dst);
 120 }
 121
 122 #if IS_ENABLED(CONFIG_IPV6)
 123 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
 124         struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
 125         __u16 vid)
 126 {
 127         struct br_ip br_dst;
 128
 129         br_dst.u.ip6 = *dst;
 130         br_dst.proto = htons(ETH_P_IPV6);
 131         br_dst.vid = vid;
 132
 133         return br_mdb_ip_get(mdb, &br_dst);
 134 }
 135 #endif
 136
 137 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 138                                         struct sk_buff *skb, u16 vid)
 139 {
 140         struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
 141         struct br_ip ip;
 142
 143         if (br->multicast_disabled)
 144                 return NULL;
 145
 146         if (BR_INPUT_SKB_CB(skb)->igmp)
 147                 return NULL;
 148
 149         ip.proto = skb->protocol;
 150         ip.vid = vid;
 151
 152         switch (skb->protocol) {
 153         case htons(ETH_P_IP):
 154                 ip.u.ip4 = ip_hdr(skb)->daddr;
 155                 break;
 156 #if IS_ENABLED(CONFIG_IPV6)
 157         case htons(ETH_P_IPV6):
 158                 ip.u.ip6 = ipv6_hdr(skb)->daddr;
 159                 break;
 160 #endif
 161         default:
 162                 return NULL;
 163         }
 164
 165         return br_mdb_ip_get(mdb, &ip);
 166 }
 167
 168 static void br_mdb_free(struct rcu_head *head)
 169 {
 170         struct net_bridge_mdb_htable *mdb =
 171                 container_of(head, struct net_bridge_mdb_htable, rcu);
 172         struct net_bridge_mdb_htable *old = mdb->old;
 173
 174         mdb->old = NULL;
 175         kfree(old->mhash);
 176         kfree(old);
 177 }
 178
 179 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
 180                        struct net_bridge_mdb_htable *old,
 181                        int elasticity)
 182 {
 183         struct net_bridge_mdb_entry *mp;
 184         int maxlen;
 185         int len;
 186         int i;
 187
 188         for (i = 0; i < old->max; i++)
 189                 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
 190                         hlist_add_head(&mp->hlist[new->ver],
 191                                        &new->mhash[br_ip_hash(new, &mp->addr)]);
 192
 193         if (!elasticity)
 194                 return 0;
 195
 196         maxlen = 0;
 197         for (i = 0; i < new->max; i++) {
 198                 len = 0;
 199                 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
 200                         len++;
 201                 if (len > maxlen)
 202                         maxlen = len;
 203         }
 204
 205         return maxlen > elasticity ? -EINVAL : 0;
 206 }
 207
 208 void br_multicast_free_pg(struct rcu_head *head)
 209 {
 210         struct net_bridge_port_group *p =
 211                 container_of(head, struct net_bridge_port_group, rcu);
 212
 213         kfree(p);
 214 }
 215
 216 static void br_multicast_free_group(struct rcu_head *head)
 217 {
 218         struct net_bridge_mdb_entry *mp =
 219                 container_of(head, struct net_bridge_mdb_entry, rcu);
 220
 221         kfree(mp);
 222 }
 223
 224 static void br_multicast_group_expired(unsigned long data)
 225 {
 226         struct net_bridge_mdb_entry *mp = (void *)data;
 227         struct net_bridge *br = mp->br;
 228         struct net_bridge_mdb_htable *mdb;
 229
 230         spin_lock(&br->multicast_lock);
 231         if (!netif_running(br->dev) || timer_pending(&mp->timer))
 232                 goto out;
 233
 234         mp->mglist = false;
 235
 236         if (mp->ports)
 237                 goto out;
 238
 239         mdb = mlock_dereference(br->mdb, br);
 240
 241         hlist_del_rcu(&mp->hlist[mdb->ver]);
 242         mdb->size--;
 243
 244         call_rcu_bh(&mp->rcu, br_multicast_free_group);
 245
 246 out:
 247         spin_unlock(&br->multicast_lock);
 248 }
 249
 250 static void br_multicast_del_pg(struct net_bridge *br,
 251                                 struct net_bridge_port_group *pg)
 252 {
 253         struct net_bridge_mdb_htable *mdb;
 254         struct net_bridge_mdb_entry *mp;
 255         struct net_bridge_port_group *p;
 256         struct net_bridge_port_group __rcu **pp;
 257
 258         mdb = mlock_dereference(br->mdb, br);
 259
 260         mp = br_mdb_ip_get(mdb, &pg->addr);
 261         if (WARN_ON(!mp))
 262                 return;
 263
 264         for (pp = &mp->ports;
 265              (p = mlock_dereference(*pp, br)) != NULL;
 266              pp = &p->next) {
 267                 if (p != pg)
 268                         continue;
 269
 270                 rcu_assign_pointer(*pp, p->next);
 271                 hlist_del_init(&p->mglist);
 272                 del_timer(&p->timer);
 273                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
 274
 275                 if (!mp->ports && !mp->mglist &&
 276                     netif_running(br->dev))
 277                         mod_timer(&mp->timer, jiffies);
 278
 279                 return;
 280         }
 281
 282         WARN_ON(1);
 283 }
 284
 285 static void br_multicast_port_group_expired(unsigned long data)
 286 {
 287         struct net_bridge_port_group *pg = (void *)data;
 288         struct net_bridge *br = pg->port->br;
 289
 290         spin_lock(&br->multicast_lock);
 291         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
 292             hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
 293                 goto out;
 294
 295         br_multicast_del_pg(br, pg);
 296
 297 out:
 298         spin_unlock(&br->multicast_lock);
 299 }
 300
 301 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
 302                          int elasticity)
 303 {
 304         struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
 305         struct net_bridge_mdb_htable *mdb;
 306         int err;
 307
 308         mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
 309         if (!mdb)
 310                 return -ENOMEM;
 311
 312         mdb->max = max;
 313         mdb->old = old;
 314
 315         mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
 316         if (!mdb->mhash) {
 317                 kfree(mdb);
 318                 return -ENOMEM;
 319         }
 320
 321         mdb->size = old ? old->size : 0;
 322         mdb->ver = old ? old->ver ^ 1 : 0;
 323
 324         if (!old || elasticity)
 325                 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
 326         else
 327                 mdb->secret = old->secret;
 328
 329         if (!old)
 330                 goto out;
 331
 332         err = br_mdb_copy(mdb, old, elasticity);
 333         if (err) {
 334                 kfree(mdb->mhash);
 335                 kfree(mdb);
 336                 return err;
 337         }
 338
 339         br_mdb_rehash_seq++;
 340         call_rcu_bh(&mdb->rcu, br_mdb_free);
 341
 342 out:
 343         rcu_assign_pointer(*mdbp, mdb);
 344
 345         return 0;
 346 }
 347
 348 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
 349                                                     __be32 group)
 350 {
 351         struct sk_buff *skb;
 352         struct igmphdr *ih;
 353         struct ethhdr *eth;
 354         struct iphdr *iph;
 355
 356         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
 357                                                  sizeof(*ih) + 4);
 358         if (!skb)
 359                 goto out;
 360
 361         skb->protocol = htons(ETH_P_IP);
 362
 363         skb_reset_mac_header(skb);
 364         eth = eth_hdr(skb);
 365
 366         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 367         eth->h_dest[0] = 1;
 368         eth->h_dest[1] = 0;
 369         eth->h_dest[2] = 0x5e;
 370         eth->h_dest[3] = 0;
 371         eth->h_dest[4] = 0;
 372         eth->h_dest[5] = 1;
 373         eth->h_proto = htons(ETH_P_IP);
 374         skb_put(skb, sizeof(*eth));
 375
 376         skb_set_network_header(skb, skb->len);
 377         iph = ip_hdr(skb);
 378
 379         iph->version = 4;
 380         iph->ihl = 6;
 381         iph->tos = 0xc0;
 382         iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
 383         iph->id = 0;
 384         iph->frag_off = htons(IP_DF);
 385         iph->ttl = 1;
 386         iph->protocol = IPPROTO_IGMP;
 387         iph->saddr = br->multicast_query_use_ifaddr ?
 388                      inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
 389         iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 390         ((u8 *)&iph[1])[0] = IPOPT_RA;
 391         ((u8 *)&iph[1])[1] = 4;
 392         ((u8 *)&iph[1])[2] = 0;
 393         ((u8 *)&iph[1])[3] = 0;
 394         ip_send_check(iph);
 395         skb_put(skb, 24);
 396
 397         skb_set_transport_header(skb, skb->len);
 398         ih = igmp_hdr(skb);
 399         ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
 400         ih->code = (group ? br->multicast_last_member_interval :
 401                             br->multicast_query_response_interval) /
 402                    (HZ / IGMP_TIMER_SCALE);
 403         ih->group = group;
 404         ih->csum = 0;
 405         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 406         skb_put(skb, sizeof(*ih));
 407
 408         __skb_pull(skb, sizeof(*eth));
 409
 410 out:
 411         return skb;
 412 }
 413
 414 #if IS_ENABLED(CONFIG_IPV6)
 415 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
 416                                                     const struct in6_addr *group)
 417 {
 418         struct sk_buff *skb;
 419         struct ipv6hdr *ip6h;
 420         struct mld_msg *mldq;
 421         struct ethhdr *eth;
 422         u8 *hopopt;
 423         unsigned long interval;
 424
 425         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
 426                                                  8 + sizeof(*mldq));
 427         if (!skb)
 428                 goto out;
 429
 430         skb->protocol = htons(ETH_P_IPV6);
 431
 432         /* Ethernet header */
 433         skb_reset_mac_header(skb);
 434         eth = eth_hdr(skb);
 435
 436         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 437         eth->h_proto = htons(ETH_P_IPV6);
 438         skb_put(skb, sizeof(*eth));
 439
 440         /* IPv6 header + HbH option */
 441         skb_set_network_header(skb, skb->len);
 442         ip6h = ipv6_hdr(skb);
 443
 444         *(__force __be32 *)ip6h = htonl(0x60000000);
 445         ip6h->payload_len = htons(8 + sizeof(*mldq));
 446         ip6h->nexthdr = IPPROTO_HOPOPTS;
 447         ip6h->hop_limit = 1;
 448         ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
 449         if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
 450                                &ip6h->saddr)) {
 451                 kfree_skb(skb);
 452                 return NULL;
 453         }
 454         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 455
 456         hopopt = (u8 *)(ip6h + 1);
 457         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
 458         hopopt[1] = 0;                          /* length of HbH */
 459         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
 460         hopopt[3] = 2;                          /* Length of RA Option */
 461         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
 462         hopopt[5] = 0;
 463         hopopt[6] = IPV6_TLV_PAD1;              /* Pad1 */
 464         hopopt[7] = IPV6_TLV_PAD1;              /* Pad1 */
 465
 466         skb_put(skb, sizeof(*ip6h) + 8);
 467
 468         /* ICMPv6 */
 469         skb_set_transport_header(skb, skb->len);
 470         mldq = (struct mld_msg *) icmp6_hdr(skb);
 471
 472         interval = ipv6_addr_any(group) ?
 473                         br->multicast_query_response_interval :
 474                         br->multicast_last_member_interval;
 475
 476         mldq->mld_type = ICMPV6_MGM_QUERY;
 477         mldq->mld_code = 0;
 478         mldq->mld_cksum = 0;
 479         mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
 480         mldq->mld_reserved = 0;
 481         mldq->mld_mca = *group;
 482
 483         /* checksum */
 484         mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 485                                           sizeof(*mldq), IPPROTO_ICMPV6,
 486                                           csum_partial(mldq,
 487                                                        sizeof(*mldq), 0));
 488         skb_put(skb, sizeof(*mldq));
 489
 490         __skb_pull(skb, sizeof(*eth));
 491
 492 out:
 493         return skb;
 494 }
 495 #endif
 496
 497 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 498                                                 struct br_ip *addr)
 499 {
 500         switch (addr->proto) {
 501         case htons(ETH_P_IP):
 502                 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
 503 #if IS_ENABLED(CONFIG_IPV6)
 504         case htons(ETH_P_IPV6):
 505                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
 506 #endif
 507         }
 508         return NULL;
 509 }
 510
 511 static struct net_bridge_mdb_entry *br_multicast_get_group(
 512         struct net_bridge *br, struct net_bridge_port *port,
 513         struct br_ip *group, int hash)
 514 {
 515         struct net_bridge_mdb_htable *mdb;
 516         struct net_bridge_mdb_entry *mp;
 517         unsigned int count = 0;
 518         unsigned int max;
 519         int elasticity;
 520         int err;
 521
 522         mdb = rcu_dereference_protected(br->mdb, 1);
 523         hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 524                 count++;
 525                 if (unlikely(br_ip_equal(group, &mp->addr)))
 526                         return mp;
 527         }
 528
 529         elasticity = 0;
 530         max = mdb->max;
 531
 532         if (unlikely(count > br->hash_elasticity && count)) {
 533                 if (net_ratelimit())
 534                         br_info(br, "Multicast hash table "
 535                                 "chain limit reached: %s\n",
 536                                 port ? port->dev->name : br->dev->name);
 537
 538                 elasticity = br->hash_elasticity;
 539         }
 540
 541         if (mdb->size >= max) {
 542                 max *= 2;
 543                 if (unlikely(max > br->hash_max)) {
 544                         br_warn(br, "Multicast hash table maximum of %d "
 545                                 "reached, disabling snooping: %s\n",
 546                                 br->hash_max,
 547                                 port ? port->dev->name : br->dev->name);
 548                         err = -E2BIG;
 549 disable:
 550                         br->multicast_disabled = 1;
 551                         goto err;
 552                 }
 553         }
 554
 555         if (max > mdb->max || elasticity) {
 556                 if (mdb->old) {
 557                         if (net_ratelimit())
 558                                 br_info(br, "Multicast hash table "
 559                                         "on fire: %s\n",
 560                                         port ? port->dev->name : br->dev->name);
 561                         err = -EEXIST;
 562                         goto err;
 563                 }
 564
 565                 err = br_mdb_rehash(&br->mdb, max, elasticity);
 566                 if (err) {
 567                         br_warn(br, "Cannot rehash multicast "
 568                                 "hash table, disabling snooping: %s, %d, %d\n",
 569                                 port ? port->dev->name : br->dev->name,
 570                                 mdb->size, err);
 571                         goto disable;
 572                 }
 573
 574                 err = -EAGAIN;
 575                 goto err;
 576         }
 577
 578         return NULL;
 579
 580 err:
 581         mp = ERR_PTR(err);
 582         return mp;
 583 }
 584
 585 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 586         struct net_bridge_port *port, struct br_ip *group)
 587 {
 588         struct net_bridge_mdb_htable *mdb;
 589         struct net_bridge_mdb_entry *mp;
 590         int hash;
 591         int err;
 592
 593         mdb = rcu_dereference_protected(br->mdb, 1);
 594         if (!mdb) {
 595                 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
 596                 if (err)
 597                         return ERR_PTR(err);
 598                 goto rehash;
 599         }
 600
 601         hash = br_ip_hash(mdb, group);
 602         mp = br_multicast_get_group(br, port, group, hash);
 603         switch (PTR_ERR(mp)) {
 604         case 0:
 605                 break;
 606
 607         case -EAGAIN:
 608 rehash:
 609                 mdb = rcu_dereference_protected(br->mdb, 1);
 610                 hash = br_ip_hash(mdb, group);
 611                 break;
 612
 613         default:
 614                 goto out;
 615         }
 616
 617         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 618         if (unlikely(!mp))
 619                 return ERR_PTR(-ENOMEM);
 620
 621         mp->br = br;
 622         mp->addr = *group;
 623         setup_timer(&mp->timer, br_multicast_group_expired,
 624                     (unsigned long)mp);
 625
 626         hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
 627         mdb->size++;
 628
 629 out:
 630         return mp;
 631 }
 632
 633 struct net_bridge_port_group *br_multicast_new_port_group(
 634                         struct net_bridge_port *port,
 635                         struct br_ip *group,
 636                         struct net_bridge_port_group __rcu *next,
 637                         unsigned char state)
 638 {
 639         struct net_bridge_port_group *p;
 640
 641         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 642         if (unlikely(!p))
 643                 return NULL;
 644
 645         p->addr = *group;
 646         p->port = port;
 647         p->state = state;
 648         rcu_assign_pointer(p->next, next);
 649         hlist_add_head(&p->mglist, &port->mglist);
 650         setup_timer(&p->timer, br_multicast_port_group_expired,
 651                     (unsigned long)p);
 652         return p;
 653 }
 654
 655 static int br_multicast_add_group(struct net_bridge *br,
 656                                   struct net_bridge_port *port,
 657                                   struct br_ip *group)
 658 {
 659         struct net_bridge_mdb_entry *mp;
 660         struct net_bridge_port_group *p;
 661         struct net_bridge_port_group __rcu **pp;
 662         unsigned long now = jiffies;
 663         int err;
 664
 665         spin_lock(&br->multicast_lock);
 666         if (!netif_running(br->dev) ||
 667             (port && port->state == BR_STATE_DISABLED))
 668                 goto out;
 669
 670         mp = br_multicast_new_group(br, port, group);
 671         err = PTR_ERR(mp);
 672         if (IS_ERR(mp))
 673                 goto err;
 674
 675         if (!port) {
 676                 mp->mglist = true;
 677                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
 678                 goto out;
 679         }
 680
 681         for (pp = &mp->ports;
 682              (p = mlock_dereference(*pp, br)) != NULL;
 683              pp = &p->next) {
 684                 if (p->port == port)
 685                         goto found;
 686                 if ((unsigned long)p->port < (unsigned long)port)
 687                         break;
 688         }
 689
 690         p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
 691         if (unlikely(!p))
 692                 goto err;
 693         rcu_assign_pointer(*pp, p);
 694         br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
 695
 696 found:
 697         mod_timer(&p->timer, now + br->multicast_membership_interval);
 698 out:
 699         err = 0;
 700
 701 err:
 702         spin_unlock(&br->multicast_lock);
 703         return err;
 704 }
 705
 706 static int br_ip4_multicast_add_group(struct net_bridge *br,
 707                                       struct net_bridge_port *port,
 708                                       __be32 group,
 709                                       __u16 vid)
 710 {
 711         struct br_ip br_group;
 712
 713         if (ipv4_is_local_multicast(group))
 714                 return 0;
 715
 716         br_group.u.ip4 = group;
 717         br_group.proto = htons(ETH_P_IP);
 718         br_group.vid = vid;
 719
 720         return br_multicast_add_group(br, port, &br_group);
 721 }
 722
 723 #if IS_ENABLED(CONFIG_IPV6)
 724 static int br_ip6_multicast_add_group(struct net_bridge *br,
 725                                       struct net_bridge_port *port,
 726                                       const struct in6_addr *group,
 727                                       __u16 vid)
 728 {
 729         struct br_ip br_group;
 730
 731         if (ipv6_addr_is_ll_all_nodes(group))
 732                 return 0;
 733
 734         br_group.u.ip6 = *group;
 735         br_group.proto = htons(ETH_P_IPV6);
 736         br_group.vid = vid;
 737
 738         return br_multicast_add_group(br, port, &br_group);
 739 }
 740 #endif
 741
 742 static void br_multicast_router_expired(unsigned long data)
 743 {
 744         struct net_bridge_port *port = (void *)data;
 745         struct net_bridge *br = port->br;
 746
 747         spin_lock(&br->multicast_lock);
 748         if (port->multicast_router != 1 ||
 749             timer_pending(&port->multicast_router_timer) ||
 750             hlist_unhashed(&port->rlist))
 751                 goto out;
 752
 753         hlist_del_init_rcu(&port->rlist);
 754
 755 out:
 756         spin_unlock(&br->multicast_lock);
 757 }
 758
 759 static void br_multicast_local_router_expired(unsigned long data)
 760 {
 761 }
 762
 763 static void br_multicast_querier_expired(struct net_bridge *br,
 764                                          struct bridge_mcast_own_query *query)
 765 {
 766         spin_lock(&br->multicast_lock);
 767         if (!netif_running(br->dev) || br->multicast_disabled)
 768                 goto out;
 769
 770         br_multicast_start_querier(br, query);
 771
 772 out:
 773         spin_unlock(&br->multicast_lock);
 774 }
 775
 776 static void br_ip4_multicast_querier_expired(unsigned long data)
 777 {
 778         struct net_bridge *br = (void *)data;
 779
 780         br_multicast_querier_expired(br, &br->ip4_own_query);
 781 }
 782
 783 #if IS_ENABLED(CONFIG_IPV6)
 784 static void br_ip6_multicast_querier_expired(unsigned long data)
 785 {
 786         struct net_bridge *br = (void *)data;
 787
 788         br_multicast_querier_expired(br, &br->ip6_own_query);
 789 }
 790 #endif
 791
 792 static void br_multicast_select_own_querier(struct net_bridge *br,
 793                                             struct br_ip *ip,
 794                                             struct sk_buff *skb)
 795 {
 796         if (ip->proto == htons(ETH_P_IP))
 797                 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
 798 #if IS_ENABLED(CONFIG_IPV6)
 799         else
 800                 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
 801 #endif
 802 }
 803
 804 static void __br_multicast_send_query(struct net_bridge *br,
 805                                       struct net_bridge_port *port,
 806                                       struct br_ip *ip)
 807 {
 808         struct sk_buff *skb;
 809
 810         skb = br_multicast_alloc_query(br, ip);
 811         if (!skb)
 812                 return;
 813
 814         if (port) {
 815                 __skb_push(skb, sizeof(struct ethhdr));
 816                 skb->dev = port->dev;
 817                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
 818                         dev_queue_xmit);
 819         } else {
 820                 br_multicast_select_own_querier(br, ip, skb);
 821                 netif_rx(skb);
 822         }
 823 }
 824
 825 static void br_multicast_send_query(struct net_bridge *br,
 826                                     struct net_bridge_port *port,
 827                                     struct bridge_mcast_own_query *own_query)
 828 {
 829         unsigned long time;
 830         struct br_ip br_group;
 831         struct bridge_mcast_other_query *other_query = NULL;
 832
 833         if (!netif_running(br->dev) || br->multicast_disabled ||
 834             !br->multicast_querier)
 835                 return;
 836
 837         memset(&br_group.u, 0, sizeof(br_group.u));
 838
 839         if (port ? (own_query == &port->ip4_own_query) :
 840                    (own_query == &br->ip4_own_query)) {
 841                 other_query = &br->ip4_other_query;
 842                 br_group.proto = htons(ETH_P_IP);
 843 #if IS_ENABLED(CONFIG_IPV6)
 844         } else {
 845                 other_query = &br->ip6_other_query;
 846                 br_group.proto = htons(ETH_P_IPV6);
 847 #endif
 848         }
 849
 850         if (!other_query || timer_pending(&other_query->timer))
 851                 return;
 852
 853         __br_multicast_send_query(br, port, &br_group);
 854
 855         time = jiffies;
 856         time += own_query->startup_sent < br->multicast_startup_query_count ?
 857                 br->multicast_startup_query_interval :
 858                 br->multicast_query_interval;
 859         mod_timer(&own_query->timer, time);
 860 }
 861
 862 static void
 863 br_multicast_port_query_expired(struct net_bridge_port *port,
 864                                 struct bridge_mcast_own_query *query)
 865 {
 866         struct net_bridge *br = port->br;
 867
 868         spin_lock(&br->multicast_lock);
 869         if (port->state == BR_STATE_DISABLED ||
 870             port->state == BR_STATE_BLOCKING)
 871                 goto out;
 872
 873         if (query->startup_sent < br->multicast_startup_query_count)
 874                 query->startup_sent++;
 875
 876         br_multicast_send_query(port->br, port, query);
 877
 878 out:
 879         spin_unlock(&br->multicast_lock);
 880 }
 881
 882 static void br_ip4_multicast_port_query_expired(unsigned long data)
 883 {
 884         struct net_bridge_port *port = (void *)data;
 885
 886         br_multicast_port_query_expired(port, &port->ip4_own_query);
 887 }
 888
 889 #if IS_ENABLED(CONFIG_IPV6)
 890 static void br_ip6_multicast_port_query_expired(unsigned long data)
 891 {
 892         struct net_bridge_port *port = (void *)data;
 893
 894         br_multicast_port_query_expired(port, &port->ip6_own_query);
 895 }
 896 #endif
 897
 898 void br_multicast_add_port(struct net_bridge_port *port)
 899 {
 900         port->multicast_router = 1;
 901
 902         setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
 903                     (unsigned long)port);
 904         setup_timer(&port->ip4_own_query.timer,
 905                     br_ip4_multicast_port_query_expired, (unsigned long)port);
 906 #if IS_ENABLED(CONFIG_IPV6)
 907         setup_timer(&port->ip6_own_query.timer,
 908                     br_ip6_multicast_port_query_expired, (unsigned long)port);
 909 #endif
 910 }
 911
 912 void br_multicast_del_port(struct net_bridge_port *port)
 913 {
 914         del_timer_sync(&port->multicast_router_timer);
 915 }
 916
 917 static void br_multicast_enable(struct bridge_mcast_own_query *query)
 918 {
 919         query->startup_sent = 0;
 920
 921         if (try_to_del_timer_sync(&query->timer) >= 0 ||
 922             del_timer(&query->timer))
 923                 mod_timer(&query->timer, jiffies);
 924 }
 925
 926 void br_multicast_enable_port(struct net_bridge_port *port)
 927 {
 928         struct net_bridge *br = port->br;
 929
 930         spin_lock(&br->multicast_lock);
 931         if (br->multicast_disabled || !netif_running(br->dev))
 932                 goto out;
 933
 934         br_multicast_enable(&port->ip4_own_query);
 935 #if IS_ENABLED(CONFIG_IPV6)
 936         br_multicast_enable(&port->ip6_own_query);
 937 #endif
 938
 939 out:
 940         spin_unlock(&br->multicast_lock);
 941 }
 942
 943 void br_multicast_disable_port(struct net_bridge_port *port)
 944 {
 945         struct net_bridge *br = port->br;
 946         struct net_bridge_port_group *pg;
 947         struct hlist_node *n;
 948
 949         spin_lock(&br->multicast_lock);
 950         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 951                 br_multicast_del_pg(br, pg);
 952
 953         if (!hlist_unhashed(&port->rlist))
 954                 hlist_del_init_rcu(&port->rlist);
 955         del_timer(&port->multicast_router_timer);
 956         del_timer(&port->ip4_own_query.timer);
 957 #if IS_ENABLED(CONFIG_IPV6)
 958         del_timer(&port->ip6_own_query.timer);
 959 #endif
 960         spin_unlock(&br->multicast_lock);
 961 }
 962
 963 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
 964                                          struct net_bridge_port *port,
 965                                          struct sk_buff *skb,
 966                                          u16 vid)
 967 {
 968         struct igmpv3_report *ih;
 969         struct igmpv3_grec *grec;
 970         int i;
 971         int len;
 972         int num;
 973         int type;
 974         int err = 0;
 975         __be32 group;
 976
 977         if (!pskb_may_pull(skb, sizeof(*ih)))
 978                 return -EINVAL;
 979
 980         ih = igmpv3_report_hdr(skb);
 981         num = ntohs(ih->ngrec);
 982         len = sizeof(*ih);
 983
 984         for (i = 0; i < num; i++) {
 985                 len += sizeof(*grec);
 986                 if (!pskb_may_pull(skb, len))
 987                         return -EINVAL;
 988
 989                 grec = (void *)(skb->data + len - sizeof(*grec));
 990                 group = grec->grec_mca;
 991                 type = grec->grec_type;
 992
 993                 len += ntohs(grec->grec_nsrcs) * 4;
 994                 if (!pskb_may_pull(skb, len))
 995                         return -EINVAL;
 996
 997                 /* We treat this as an IGMPv2 report for now. */
 998                 switch (type) {
 999                 case IGMPV3_MODE_IS_INCLUDE:
1000                 case IGMPV3_MODE_IS_EXCLUDE:
1001                 case IGMPV3_CHANGE_TO_INCLUDE:
1002                 case IGMPV3_CHANGE_TO_EXCLUDE:
1003                 case IGMPV3_ALLOW_NEW_SOURCES:
1004                 case IGMPV3_BLOCK_OLD_SOURCES:
1005                         break;
1006
1007                 default:
1008                         continue;
1009                 }
1010
1011                 err = br_ip4_multicast_add_group(br, port, group, vid);
1012                 if (err)
1013                         break;
1014         }
1015
1016         return err;
1017 }
1018
1019 #if IS_ENABLED(CONFIG_IPV6)
1020 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1021                                         struct net_bridge_port *port,
1022                                         struct sk_buff *skb,
1023                                         u16 vid)
1024 {
1025         struct icmp6hdr *icmp6h;
1026         struct mld2_grec *grec;
1027         int i;
1028         int len;
1029         int num;
1030         int err = 0;
1031
1032         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1033                 return -EINVAL;
1034
1035         icmp6h = icmp6_hdr(skb);
1036         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1037         len = sizeof(*icmp6h);
1038
1039         for (i = 0; i < num; i++) {
1040                 __be16 *nsrcs, _nsrcs;
1041
1042                 nsrcs = skb_header_pointer(skb,
1043                                            len + offsetof(struct mld2_grec,
1044                                                           grec_nsrcs),
1045                                            sizeof(_nsrcs), &_nsrcs);
1046                 if (!nsrcs)
1047                         return -EINVAL;
1048
1049                 if (!pskb_may_pull(skb,
1050                                    len + sizeof(*grec) +
1051                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
1052                         return -EINVAL;
1053
1054                 grec = (struct mld2_grec *)(skb->data + len);
1055                 len += sizeof(*grec) +
1056                        sizeof(struct in6_addr) * ntohs(*nsrcs);
1057
1058                 /* We treat these as MLDv1 reports for now. */
1059                 switch (grec->grec_type) {
1060                 case MLD2_MODE_IS_INCLUDE:
1061                 case MLD2_MODE_IS_EXCLUDE:
1062                 case MLD2_CHANGE_TO_INCLUDE:
1063                 case MLD2_CHANGE_TO_EXCLUDE:
1064                 case MLD2_ALLOW_NEW_SOURCES:
1065                 case MLD2_BLOCK_OLD_SOURCES:
1066                         break;
1067
1068                 default:
1069                         continue;
1070                 }
1071
1072                 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1073                                                  vid);
1074                 if (!err)
1075                         break;
1076         }
1077
1078         return err;
1079 }
1080 #endif
1081
1082 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1083                                             __be32 saddr)
1084 {
1085         if (!timer_pending(&br->ip4_own_query.timer) &&
1086             !timer_pending(&br->ip4_other_query.timer))
1087                 goto update;
1088
1089         if (!br->ip4_querier.addr.u.ip4)
1090                 goto update;
1091
1092         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1093                 goto update;
1094
1095         return false;
1096
1097 update:
1098         br->ip4_querier.addr.u.ip4 = saddr;
1099
1100         return true;
1101 }
1102
1103 #if IS_ENABLED(CONFIG_IPV6)
1104 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1105                                             struct in6_addr *saddr)
1106 {
1107         if (!timer_pending(&br->ip6_own_query.timer) &&
1108             !timer_pending(&br->ip6_other_query.timer))
1109                 goto update;
1110
1111         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1112                 goto update;
1113
1114         return false;
1115
1116 update:
1117         br->ip6_querier.addr.u.ip6 = *saddr;
1118
1119         return true;
1120 }
1121 #endif
1122
1123 static bool br_multicast_select_querier(struct net_bridge *br,
1124                                         struct br_ip *saddr)
1125 {
1126         switch (saddr->proto) {
1127         case htons(ETH_P_IP):
1128                 return br_ip4_multicast_select_querier(br, saddr->u.ip4);
1129 #if IS_ENABLED(CONFIG_IPV6)
1130         case htons(ETH_P_IPV6):
1131                 return br_ip6_multicast_select_querier(br, &saddr->u.ip6);
1132 #endif
1133         }
1134
1135         return false;
1136 }
1137
1138 static void
1139 br_multicast_update_query_timer(struct net_bridge *br,
1140                                 struct bridge_mcast_other_query *query,
1141                                 unsigned long max_delay)
1142 {
1143         if (!timer_pending(&query->timer))
1144                 query->delay_time = jiffies + max_delay;
1145
1146         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1147 }
1148
1149 /*
1150  * Add port to router_list
1151  *  list is maintained ordered by pointer value
1152  *  and locked by br->multicast_lock and RCU
1153  */
1154 static void br_multicast_add_router(struct net_bridge *br,
1155                                     struct net_bridge_port *port)
1156 {
1157         struct net_bridge_port *p;
1158         struct hlist_node *slot = NULL;
1159
1160         hlist_for_each_entry(p, &br->router_list, rlist) {
1161                 if ((unsigned long) port >= (unsigned long) p)
1162                         break;
1163                 slot = &p->rlist;
1164         }
1165
1166         if (slot)
1167                 hlist_add_after_rcu(slot, &port->rlist);
1168         else
1169                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1170 }
1171
1172 static void br_multicast_mark_router(struct net_bridge *br,
1173                                      struct net_bridge_port *port)
1174 {
1175         unsigned long now = jiffies;
1176
1177         if (!port) {
1178                 if (br->multicast_router == 1)
1179                         mod_timer(&br->multicast_router_timer,
1180                                   now + br->multicast_querier_interval);
1181                 return;
1182         }
1183
1184         if (port->multicast_router != 1)
1185                 return;
1186
1187         if (!hlist_unhashed(&port->rlist))
1188                 goto timer;
1189
1190         br_multicast_add_router(br, port);
1191
1192 timer:
1193         mod_timer(&port->multicast_router_timer,
1194                   now + br->multicast_querier_interval);
1195 }
1196
1197 static void br_multicast_query_received(struct net_bridge *br,
1198                                         struct net_bridge_port *port,
1199                                         struct bridge_mcast_other_query *query,
1200                                         struct br_ip *saddr,
1201                                         unsigned long max_delay)
1202 {
1203         if (!br_multicast_select_querier(br, saddr))
1204                 return;
1205
1206         br_multicast_update_query_timer(br, query, max_delay);
1207         br_multicast_mark_router(br, port);
1208 }
1209
1210 static int br_ip4_multicast_query(struct net_bridge *br,
1211                                   struct net_bridge_port *port,
1212                                   struct sk_buff *skb,
1213                                   u16 vid)
1214 {
1215         const struct iphdr *iph = ip_hdr(skb);
1216         struct igmphdr *ih = igmp_hdr(skb);
1217         struct net_bridge_mdb_entry *mp;
1218         struct igmpv3_query *ih3;
1219         struct net_bridge_port_group *p;
1220         struct net_bridge_port_group __rcu **pp;
1221         struct br_ip saddr;
1222         unsigned long max_delay;
1223         unsigned long now = jiffies;
1224         __be32 group;
1225         int err = 0;
1226
1227         spin_lock(&br->multicast_lock);
1228         if (!netif_running(br->dev) ||
1229             (port && port->state == BR_STATE_DISABLED))
1230                 goto out;
1231
1232         group = ih->group;
1233
1234         if (skb->len == sizeof(*ih)) {
1235                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1236
1237                 if (!max_delay) {
1238                         max_delay = 10 * HZ;
1239                         group = 0;
1240                 }
1241         } else {
1242                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1243                         err = -EINVAL;
1244                         goto out;
1245                 }
1246
1247                 ih3 = igmpv3_query_hdr(skb);
1248                 if (ih3->nsrcs)
1249                         goto out;
1250
1251                 max_delay = ih3->code ?
1252                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1253         }
1254
1255         /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1256          * all-systems destination addresses (224.0.0.1) for general queries
1257          */
1258         if (!group && iph->daddr != htonl(INADDR_ALLHOSTS_GROUP)) {
1259                 err = -EINVAL;
1260                 goto out;
1261         }
1262
1263         if (!group) {
1264                 saddr.proto = htons(ETH_P_IP);
1265                 saddr.u.ip4 = iph->saddr;
1266
1267                 br_multicast_query_received(br, port, &br->ip4_other_query,
1268                                             &saddr, max_delay);
1269                 goto out;
1270         }
1271
1272         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1273         if (!mp)
1274                 goto out;
1275
1276         max_delay *= br->multicast_last_member_count;
1277
1278         if (mp->mglist &&
1279             (timer_pending(&mp->timer) ?
1280              time_after(mp->timer.expires, now + max_delay) :
1281              try_to_del_timer_sync(&mp->timer) >= 0))
1282                 mod_timer(&mp->timer, now + max_delay);
1283
1284         for (pp = &mp->ports;
1285              (p = mlock_dereference(*pp, br)) != NULL;
1286              pp = &p->next) {
1287                 if (timer_pending(&p->timer) ?
1288                     time_after(p->timer.expires, now + max_delay) :
1289                     try_to_del_timer_sync(&p->timer) >= 0)
1290                         mod_timer(&p->timer, now + max_delay);
1291         }
1292
1293 out:
1294         spin_unlock(&br->multicast_lock);
1295         return err;
1296 }
1297
1298 #if IS_ENABLED(CONFIG_IPV6)
1299 static int br_ip6_multicast_query(struct net_bridge *br,
1300                                   struct net_bridge_port *port,
1301                                   struct sk_buff *skb,
1302                                   u16 vid)
1303 {
1304         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1305         struct mld_msg *mld;
1306         struct net_bridge_mdb_entry *mp;
1307         struct mld2_query *mld2q;
1308         struct net_bridge_port_group *p;
1309         struct net_bridge_port_group __rcu **pp;
1310         struct br_ip saddr;
1311         unsigned long max_delay;
1312         unsigned long now = jiffies;
1313         const struct in6_addr *group = NULL;
1314         bool is_general_query;
1315         int err = 0;
1316
1317         spin_lock(&br->multicast_lock);
1318         if (!netif_running(br->dev) ||
1319             (port && port->state == BR_STATE_DISABLED))
1320                 goto out;
1321
1322         /* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */
1323         if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
1324                 err = -EINVAL;
1325                 goto out;
1326         }
1327
1328         if (skb->len == sizeof(*mld)) {
1329                 if (!pskb_may_pull(skb, sizeof(*mld))) {
1330                         err = -EINVAL;
1331                         goto out;
1332                 }
1333                 mld = (struct mld_msg *) icmp6_hdr(skb);
1334                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1335                 if (max_delay)
1336                         group = &mld->mld_mca;
1337         } else {
1338                 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1339                         err = -EINVAL;
1340                         goto out;
1341                 }
1342                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1343                 if (!mld2q->mld2q_nsrcs)
1344                         group = &mld2q->mld2q_mca;
1345
1346                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1347         }
1348
1349         is_general_query = group && ipv6_addr_any(group);
1350
1351         /* RFC2710+RFC3810 (MLDv1+MLDv2) require the multicast link layer
1352          * all-nodes destination address (ff02::1) for general queries
1353          */
1354         if (is_general_query && !ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) {
1355                 err = -EINVAL;
1356                 goto out;
1357         }
1358
1359         if (is_general_query) {
1360                 saddr.proto = htons(ETH_P_IPV6);
1361                 saddr.u.ip6 = ip6h->saddr;
1362
1363                 br_multicast_query_received(br, port, &br->ip6_other_query,
1364                                             &saddr, max_delay);
1365                 goto out;
1366         }
1367
1368         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1369         if (!mp)
1370                 goto out;
1371
1372         max_delay *= br->multicast_last_member_count;
1373         if (mp->mglist &&
1374             (timer_pending(&mp->timer) ?
1375              time_after(mp->timer.expires, now + max_delay) :
1376              try_to_del_timer_sync(&mp->timer) >= 0))
1377                 mod_timer(&mp->timer, now + max_delay);
1378
1379         for (pp = &mp->ports;
1380              (p = mlock_dereference(*pp, br)) != NULL;
1381              pp = &p->next) {
1382                 if (timer_pending(&p->timer) ?
1383                     time_after(p->timer.expires, now + max_delay) :
1384                     try_to_del_timer_sync(&p->timer) >= 0)
1385                         mod_timer(&p->timer, now + max_delay);
1386         }
1387
1388 out:
1389         spin_unlock(&br->multicast_lock);
1390         return err;
1391 }
1392 #endif
1393
1394 static void
1395 br_multicast_leave_group(struct net_bridge *br,
1396                          struct net_bridge_port *port,
1397                          struct br_ip *group,
1398                          struct bridge_mcast_other_query *other_query,
1399                          struct bridge_mcast_own_query *own_query)
1400 {
1401         struct net_bridge_mdb_htable *mdb;
1402         struct net_bridge_mdb_entry *mp;
1403         struct net_bridge_port_group *p;
1404         unsigned long now;
1405         unsigned long time;
1406
1407         spin_lock(&br->multicast_lock);
1408         if (!netif_running(br->dev) ||
1409             (port && port->state == BR_STATE_DISABLED) ||
1410             timer_pending(&other_query->timer))
1411                 goto out;
1412
1413         mdb = mlock_dereference(br->mdb, br);
1414         mp = br_mdb_ip_get(mdb, group);
1415         if (!mp)
1416                 goto out;
1417
1418         if (br->multicast_querier) {
1419                 __br_multicast_send_query(br, port, &mp->addr);
1420
1421                 time = jiffies + br->multicast_last_member_count *
1422                                  br->multicast_last_member_interval;
1423
1424                 mod_timer(&own_query->timer, time);
1425
1426                 for (p = mlock_dereference(mp->ports, br);
1427                      p != NULL;
1428                      p = mlock_dereference(p->next, br)) {
1429                         if (p->port != port)
1430                                 continue;
1431
1432                         if (!hlist_unhashed(&p->mglist) &&
1433                             (timer_pending(&p->timer) ?
1434                              time_after(p->timer.expires, time) :
1435                              try_to_del_timer_sync(&p->timer) >= 0)) {
1436                                 mod_timer(&p->timer, time);
1437                         }
1438
1439                         break;
1440                 }
1441         }
1442
1443         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1444                 struct net_bridge_port_group __rcu **pp;
1445
1446                 for (pp = &mp->ports;
1447                      (p = mlock_dereference(*pp, br)) != NULL;
1448                      pp = &p->next) {
1449                         if (p->port != port)
1450                                 continue;
1451
1452                         rcu_assign_pointer(*pp, p->next);
1453                         hlist_del_init(&p->mglist);
1454                         del_timer(&p->timer);
1455                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1456                         br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1457
1458                         if (!mp->ports && !mp->mglist &&
1459                             netif_running(br->dev))
1460                                 mod_timer(&mp->timer, jiffies);
1461                 }
1462                 goto out;
1463         }
1464
1465         now = jiffies;
1466         time = now + br->multicast_last_member_count *
1467                      br->multicast_last_member_interval;
1468
1469         if (!port) {
1470                 if (mp->mglist &&
1471                     (timer_pending(&mp->timer) ?
1472                      time_after(mp->timer.expires, time) :
1473                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1474                         mod_timer(&mp->timer, time);
1475                 }
1476
1477                 goto out;
1478         }
1479
1480         for (p = mlock_dereference(mp->ports, br);
1481              p != NULL;
1482              p = mlock_dereference(p->next, br)) {
1483                 if (p->port != port)
1484                         continue;
1485
1486                 if (!hlist_unhashed(&p->mglist) &&
1487                     (timer_pending(&p->timer) ?
1488                      time_after(p->timer.expires, time) :
1489                      try_to_del_timer_sync(&p->timer) >= 0)) {
1490                         mod_timer(&p->timer, time);
1491                 }
1492
1493                 break;
1494         }
1495 out:
1496         spin_unlock(&br->multicast_lock);
1497 }
1498
1499 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1500                                          struct net_bridge_port *port,
1501                                          __be32 group,
1502                                          __u16 vid)
1503 {
1504         struct br_ip br_group;
1505         struct bridge_mcast_own_query *own_query;
1506
1507         if (ipv4_is_local_multicast(group))
1508                 return;
1509
1510         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1511
1512         br_group.u.ip4 = group;
1513         br_group.proto = htons(ETH_P_IP);
1514         br_group.vid = vid;
1515
1516         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1517                                  own_query);
1518 }
1519
1520 #if IS_ENABLED(CONFIG_IPV6)
1521 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1522                                          struct net_bridge_port *port,
1523                                          const struct in6_addr *group,
1524                                          __u16 vid)
1525 {
1526         struct br_ip br_group;
1527         struct bridge_mcast_own_query *own_query;
1528
1529         if (ipv6_addr_is_ll_all_nodes(group))
1530                 return;
1531
1532         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1533
1534         br_group.u.ip6 = *group;
1535         br_group.proto = htons(ETH_P_IPV6);
1536         br_group.vid = vid;
1537
1538         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1539                                  own_query);
1540 }
1541 #endif
1542
1543 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1544                                  struct net_bridge_port *port,
1545                                  struct sk_buff *skb,
1546                                  u16 vid)
1547 {
1548         struct sk_buff *skb2 = skb;
1549         const struct iphdr *iph;
1550         struct igmphdr *ih;
1551         unsigned int len;
1552         unsigned int offset;
1553         int err;
1554
1555         /* We treat OOM as packet loss for now. */
1556         if (!pskb_may_pull(skb, sizeof(*iph)))
1557                 return -EINVAL;
1558
1559         iph = ip_hdr(skb);
1560
1561         if (iph->ihl < 5 || iph->version != 4)
1562                 return -EINVAL;
1563
1564         if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1565                 return -EINVAL;
1566
1567         iph = ip_hdr(skb);
1568
1569         if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1570                 return -EINVAL;
1571
1572         if (iph->protocol != IPPROTO_IGMP) {
1573                 if (!ipv4_is_local_multicast(iph->daddr))
1574                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1575                 return 0;
1576         }
1577
1578         len = ntohs(iph->tot_len);
1579         if (skb->len < len || len < ip_hdrlen(skb))
1580                 return -EINVAL;
1581
1582         if (skb->len > len) {
1583                 skb2 = skb_clone(skb, GFP_ATOMIC);
1584                 if (!skb2)
1585                         return -ENOMEM;
1586
1587                 err = pskb_trim_rcsum(skb2, len);
1588                 if (err)
1589                         goto err_out;
1590         }
1591
1592         len -= ip_hdrlen(skb2);
1593         offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1594         __skb_pull(skb2, offset);
1595         skb_reset_transport_header(skb2);
1596
1597         err = -EINVAL;
1598         if (!pskb_may_pull(skb2, sizeof(*ih)))
1599                 goto out;
1600
1601         switch (skb2->ip_summed) {
1602         case CHECKSUM_COMPLETE:
1603                 if (!csum_fold(skb2->csum))
1604                         break;
1605                 /* fall through */
1606         case CHECKSUM_NONE:
1607                 skb2->csum = 0;
1608                 if (skb_checksum_complete(skb2))
1609                         goto out;
1610         }
1611
1612         err = 0;
1613
1614         BR_INPUT_SKB_CB(skb)->igmp = 1;
1615         ih = igmp_hdr(skb2);
1616
1617         switch (ih->type) {
1618         case IGMP_HOST_MEMBERSHIP_REPORT:
1619         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1620                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1621                 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1622                 break;
1623         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1624                 err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
1625                 break;
1626         case IGMP_HOST_MEMBERSHIP_QUERY:
1627                 err = br_ip4_multicast_query(br, port, skb2, vid);
1628                 break;
1629         case IGMP_HOST_LEAVE_MESSAGE:
1630                 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1631                 break;
1632         }
1633
1634 out:
1635         __skb_push(skb2, offset);
1636 err_out:
1637         if (skb2 != skb)
1638                 kfree_skb(skb2);
1639         return err;
1640 }
1641
1642 #if IS_ENABLED(CONFIG_IPV6)
1643 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1644                                  struct net_bridge_port *port,
1645                                  struct sk_buff *skb,
1646                                  u16 vid)
1647 {
1648         struct sk_buff *skb2;
1649         const struct ipv6hdr *ip6h;
1650         u8 icmp6_type;
1651         u8 nexthdr;
1652         __be16 frag_off;
1653         unsigned int len;
1654         int offset;
1655         int err;
1656
1657         if (!pskb_may_pull(skb, sizeof(*ip6h)))
1658                 return -EINVAL;
1659
1660         ip6h = ipv6_hdr(skb);
1661
1662         /*
1663          * We're interested in MLD messages only.
1664          *  - Version is 6
1665          *  - MLD has always Router Alert hop-by-hop option
1666          *  - But we do not support jumbrograms.
1667          */
1668         if (ip6h->version != 6)
1669                 return 0;
1670
1671         /* Prevent flooding this packet if there is no listener present */
1672         if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr))
1673                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1674
1675         if (ip6h->nexthdr != IPPROTO_HOPOPTS ||
1676             ip6h->payload_len == 0)
1677                 return 0;
1678
1679         len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1680         if (skb->len < len)
1681                 return -EINVAL;
1682
1683         nexthdr = ip6h->nexthdr;
1684         offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1685
1686         if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1687                 return 0;
1688
1689         /* Okay, we found ICMPv6 header */
1690         skb2 = skb_clone(skb, GFP_ATOMIC);
1691         if (!skb2)
1692                 return -ENOMEM;
1693
1694         err = -EINVAL;
1695         if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1696                 goto out;
1697
1698         len -= offset - skb_network_offset(skb2);
1699
1700         __skb_pull(skb2, offset);
1701         skb_reset_transport_header(skb2);
1702         skb_postpull_rcsum(skb2, skb_network_header(skb2),
1703                            skb_network_header_len(skb2));
1704
1705         icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1706
1707         switch (icmp6_type) {
1708         case ICMPV6_MGM_QUERY:
1709         case ICMPV6_MGM_REPORT:
1710         case ICMPV6_MGM_REDUCTION:
1711         case ICMPV6_MLD2_REPORT:
1712                 break;
1713         default:
1714                 err = 0;
1715                 goto out;
1716         }
1717
1718         /* Okay, we found MLD message. Check further. */
1719         if (skb2->len > len) {
1720                 err = pskb_trim_rcsum(skb2, len);
1721                 if (err)
1722                         goto out;
1723                 err = -EINVAL;
1724         }
1725
1726         ip6h = ipv6_hdr(skb2);
1727
1728         switch (skb2->ip_summed) {
1729         case CHECKSUM_COMPLETE:
1730                 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1731                                         IPPROTO_ICMPV6, skb2->csum))
1732                         break;
1733                 /*FALLTHROUGH*/
1734         case CHECKSUM_NONE:
1735                 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1736                                                         &ip6h->daddr,
1737                                                         skb2->len,
1738                                                         IPPROTO_ICMPV6, 0));
1739                 if (__skb_checksum_complete(skb2))
1740                         goto out;
1741         }
1742
1743         err = 0;
1744
1745         BR_INPUT_SKB_CB(skb)->igmp = 1;
1746
1747         switch (icmp6_type) {
1748         case ICMPV6_MGM_REPORT:
1749             {
1750                 struct mld_msg *mld;
1751                 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1752                         err = -EINVAL;
1753                         goto out;
1754                 }
1755                 mld = (struct mld_msg *)skb_transport_header(skb2);
1756                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1757                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1758                 break;
1759             }
1760         case ICMPV6_MLD2_REPORT:
1761                 err = br_ip6_multicast_mld2_report(br, port, skb2, vid);
1762                 break;
1763         case ICMPV6_MGM_QUERY:
1764                 err = br_ip6_multicast_query(br, port, skb2, vid);
1765                 break;
1766         case ICMPV6_MGM_REDUCTION:
1767             {
1768                 struct mld_msg *mld;
1769                 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1770                         err = -EINVAL;
1771                         goto out;
1772                 }
1773                 mld = (struct mld_msg *)skb_transport_header(skb2);
1774                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1775             }
1776         }
1777
1778 out:
1779         kfree_skb(skb2);
1780         return err;
1781 }
1782 #endif
1783
1784 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1785                      struct sk_buff *skb, u16 vid)
1786 {
1787         BR_INPUT_SKB_CB(skb)->igmp = 0;
1788         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1789
1790         if (br->multicast_disabled)
1791                 return 0;
1792
1793         switch (skb->protocol) {
1794         case htons(ETH_P_IP):
1795                 return br_multicast_ipv4_rcv(br, port, skb, vid);
1796 #if IS_ENABLED(CONFIG_IPV6)
1797         case htons(ETH_P_IPV6):
1798                 return br_multicast_ipv6_rcv(br, port, skb, vid);
1799 #endif
1800         }
1801
1802         return 0;
1803 }
1804
1805 static void br_multicast_query_expired(struct net_bridge *br,
1806                                        struct bridge_mcast_own_query *query)
1807 {
1808         spin_lock(&br->multicast_lock);
1809         if (query->startup_sent < br->multicast_startup_query_count)
1810                 query->startup_sent++;
1811
1812         br_multicast_send_query(br, NULL, query);
1813         spin_unlock(&br->multicast_lock);
1814 }
1815
1816 static void br_ip4_multicast_query_expired(unsigned long data)
1817 {
1818         struct net_bridge *br = (void *)data;
1819
1820         br_multicast_query_expired(br, &br->ip4_own_query);
1821 }
1822
1823 #if IS_ENABLED(CONFIG_IPV6)
1824 static void br_ip6_multicast_query_expired(unsigned long data)
1825 {
1826         struct net_bridge *br = (void *)data;
1827
1828         br_multicast_query_expired(br, &br->ip6_own_query);
1829 }
1830 #endif
1831
1832 void br_multicast_init(struct net_bridge *br)
1833 {
1834         br->hash_elasticity = 4;
1835         br->hash_max = 512;
1836
1837         br->multicast_router = 1;
1838         br->multicast_querier = 0;
1839         br->multicast_query_use_ifaddr = 0;
1840         br->multicast_last_member_count = 2;
1841         br->multicast_startup_query_count = 2;
1842
1843         br->multicast_last_member_interval = HZ;
1844         br->multicast_query_response_interval = 10 * HZ;
1845         br->multicast_startup_query_interval = 125 * HZ / 4;
1846         br->multicast_query_interval = 125 * HZ;
1847         br->multicast_querier_interval = 255 * HZ;
1848         br->multicast_membership_interval = 260 * HZ;
1849
1850         br->ip4_other_query.delay_time = 0;
1851 #if IS_ENABLED(CONFIG_IPV6)
1852         br->ip6_other_query.delay_time = 0;
1853 #endif
1854
1855         spin_lock_init(&br->multicast_lock);
1856         setup_timer(&br->multicast_router_timer,
1857                     br_multicast_local_router_expired, 0);
1858         setup_timer(&br->ip4_other_query.timer,
1859                     br_ip4_multicast_querier_expired, (unsigned long)br);
1860         setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1861                     (unsigned long)br);
1862 #if IS_ENABLED(CONFIG_IPV6)
1863         setup_timer(&br->ip6_other_query.timer,
1864                     br_ip6_multicast_querier_expired, (unsigned long)br);
1865         setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1866                     (unsigned long)br);
1867 #endif
1868 }
1869
1870 static void __br_multicast_open(struct net_bridge *br,
1871                                 struct bridge_mcast_own_query *query)
1872 {
1873         query->startup_sent = 0;
1874
1875         if (br->multicast_disabled)
1876                 return;
1877
1878         mod_timer(&query->timer, jiffies);
1879 }
1880
1881 void br_multicast_open(struct net_bridge *br)
1882 {
1883         __br_multicast_open(br, &br->ip4_own_query);
1884 #if IS_ENABLED(CONFIG_IPV6)
1885         __br_multicast_open(br, &br->ip6_own_query);
1886 #endif
1887 }
1888
1889 void br_multicast_stop(struct net_bridge *br)
1890 {
1891         struct net_bridge_mdb_htable *mdb;
1892         struct net_bridge_mdb_entry *mp;
1893         struct hlist_node *n;
1894         u32 ver;
1895         int i;
1896
1897         del_timer_sync(&br->multicast_router_timer);
1898         del_timer_sync(&br->ip4_other_query.timer);
1899         del_timer_sync(&br->ip4_own_query.timer);
1900 #if IS_ENABLED(CONFIG_IPV6)
1901         del_timer_sync(&br->ip6_other_query.timer);
1902         del_timer_sync(&br->ip6_own_query.timer);
1903 #endif
1904
1905         spin_lock_bh(&br->multicast_lock);
1906         mdb = mlock_dereference(br->mdb, br);
1907         if (!mdb)
1908                 goto out;
1909
1910         br->mdb = NULL;
1911
1912         ver = mdb->ver;
1913         for (i = 0; i < mdb->max; i++) {
1914                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1915                                           hlist[ver]) {
1916                         del_timer(&mp->timer);
1917                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
1918                 }
1919         }
1920
1921         if (mdb->old) {
1922                 spin_unlock_bh(&br->multicast_lock);
1923                 rcu_barrier_bh();
1924                 spin_lock_bh(&br->multicast_lock);
1925                 WARN_ON(mdb->old);
1926         }
1927
1928         mdb->old = mdb;
1929         call_rcu_bh(&mdb->rcu, br_mdb_free);
1930
1931 out:
1932         spin_unlock_bh(&br->multicast_lock);
1933 }
1934
1935 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1936 {
1937         int err = -ENOENT;
1938
1939         spin_lock_bh(&br->multicast_lock);
1940         if (!netif_running(br->dev))
1941                 goto unlock;
1942
1943         switch (val) {
1944         case 0:
1945         case 2:
1946                 del_timer(&br->multicast_router_timer);
1947                 /* fall through */
1948         case 1:
1949                 br->multicast_router = val;
1950                 err = 0;
1951                 break;
1952
1953         default:
1954                 err = -EINVAL;
1955                 break;
1956         }
1957
1958 unlock:
1959         spin_unlock_bh(&br->multicast_lock);
1960
1961         return err;
1962 }
1963
1964 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1965 {
1966         struct net_bridge *br = p->br;
1967         int err = -ENOENT;
1968
1969         spin_lock(&br->multicast_lock);
1970         if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1971                 goto unlock;
1972
1973         switch (val) {
1974         case 0:
1975         case 1:
1976         case 2:
1977                 p->multicast_router = val;
1978                 err = 0;
1979
1980                 if (val < 2 && !hlist_unhashed(&p->rlist))
1981                         hlist_del_init_rcu(&p->rlist);
1982
1983                 if (val == 1)
1984                         break;
1985
1986                 del_timer(&p->multicast_router_timer);
1987
1988                 if (val == 0)
1989                         break;
1990
1991                 br_multicast_add_router(br, p);
1992                 break;
1993
1994         default:
1995                 err = -EINVAL;
1996                 break;
1997         }
1998
1999 unlock:
2000         spin_unlock(&br->multicast_lock);
2001
2002         return err;
2003 }
2004
2005 static void br_multicast_start_querier(struct net_bridge *br,
2006                                        struct bridge_mcast_own_query *query)
2007 {
2008         struct net_bridge_port *port;
2009
2010         __br_multicast_open(br, query);
2011
2012         list_for_each_entry(port, &br->port_list, list) {
2013                 if (port->state == BR_STATE_DISABLED ||
2014                     port->state == BR_STATE_BLOCKING)
2015                         continue;
2016
2017                 if (query == &br->ip4_own_query)
2018                         br_multicast_enable(&port->ip4_own_query);
2019 #if IS_ENABLED(CONFIG_IPV6)
2020                 else
2021                         br_multicast_enable(&port->ip6_own_query);
2022 #endif
2023         }
2024 }
2025
2026 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2027 {
2028         int err = 0;
2029         struct net_bridge_mdb_htable *mdb;
2030
2031         spin_lock_bh(&br->multicast_lock);
2032         if (br->multicast_disabled == !val)
2033                 goto unlock;
2034
2035         br->multicast_disabled = !val;
2036         if (br->multicast_disabled)
2037                 goto unlock;
2038
2039         if (!netif_running(br->dev))
2040                 goto unlock;
2041
2042         mdb = mlock_dereference(br->mdb, br);
2043         if (mdb) {
2044                 if (mdb->old) {
2045                         err = -EEXIST;
2046 rollback:
2047                         br->multicast_disabled = !!val;
2048                         goto unlock;
2049                 }
2050
2051                 err = br_mdb_rehash(&br->mdb, mdb->max,
2052                                     br->hash_elasticity);
2053                 if (err)
2054                         goto rollback;
2055         }
2056
2057         br_multicast_start_querier(br, &br->ip4_own_query);
2058 #if IS_ENABLED(CONFIG_IPV6)
2059         br_multicast_start_querier(br, &br->ip6_own_query);
2060 #endif
2061
2062 unlock:
2063         spin_unlock_bh(&br->multicast_lock);
2064
2065         return err;
2066 }
2067
2068 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2069 {
2070         unsigned long max_delay;
2071
2072         val = !!val;
2073
2074         spin_lock_bh(&br->multicast_lock);
2075         if (br->multicast_querier == val)
2076                 goto unlock;
2077
2078         br->multicast_querier = val;
2079         if (!val)
2080                 goto unlock;
2081
2082         max_delay = br->multicast_query_response_interval;
2083
2084         if (!timer_pending(&br->ip4_other_query.timer))
2085                 br->ip4_other_query.delay_time = jiffies + max_delay;
2086
2087         br_multicast_start_querier(br, &br->ip4_own_query);
2088
2089 #if IS_ENABLED(CONFIG_IPV6)
2090         if (!timer_pending(&br->ip6_other_query.timer))
2091                 br->ip6_other_query.delay_time = jiffies + max_delay;
2092
2093         br_multicast_start_querier(br, &br->ip6_own_query);
2094 #endif
2095
2096 unlock:
2097         spin_unlock_bh(&br->multicast_lock);
2098
2099         return 0;
2100 }
2101
2102 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2103 {
2104         int err = -ENOENT;
2105         u32 old;
2106         struct net_bridge_mdb_htable *mdb;
2107
2108         spin_lock_bh(&br->multicast_lock);
2109         if (!netif_running(br->dev))
2110                 goto unlock;
2111
2112         err = -EINVAL;
2113         if (!is_power_of_2(val))
2114                 goto unlock;
2115
2116         mdb = mlock_dereference(br->mdb, br);
2117         if (mdb && val < mdb->size)
2118                 goto unlock;
2119
2120         err = 0;
2121
2122         old = br->hash_max;
2123         br->hash_max = val;
2124
2125         if (mdb) {
2126                 if (mdb->old) {
2127                         err = -EEXIST;
2128 rollback:
2129                         br->hash_max = old;
2130                         goto unlock;
2131                 }
2132
2133                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2134                                     br->hash_elasticity);
2135                 if (err)
2136                         goto rollback;
2137         }
2138
2139 unlock:
2140         spin_unlock_bh(&br->multicast_lock);
2141
2142         return err;
2143 }