net/bridge/br_multicast.c

   1 /*
   2  * Bridge multicast support.
   3  *
   4  * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/export.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/igmp.h>
  17 #include <linux/jhash.h>
  18 #include <linux/kernel.h>
  19 #include <linux/log2.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/netfilter_bridge.h>
  22 #include <linux/random.h>
  23 #include <linux/rculist.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/slab.h>
  26 #include <linux/timer.h>
  27 #include <linux/inetdevice.h>
  28 #include <linux/mroute.h>
  29 #include <net/ip.h>
  30 #include <net/switchdev.h>
  31 #if IS_ENABLED(CONFIG_IPV6)
  32 #include <net/ipv6.h>
  33 #include <net/mld.h>
  34 #include <net/ip6_checksum.h>
  35 #include <net/addrconf.h>
  36 #endif
  37
  38 #include "br_private.h"
  39
  40 static void br_multicast_start_querier(struct net_bridge *br,
  41                                        struct bridge_mcast_own_query *query);
  42 static void br_multicast_add_router(struct net_bridge *br,
  43                                     struct net_bridge_port *port);
  44 static void br_ip4_multicast_leave_group(struct net_bridge *br,
  45                                          struct net_bridge_port *port,
  46                                          __be32 group,
  47                                          __u16 vid,
  48                                          const unsigned char *src);
  49
  50 static void __del_port_router(struct net_bridge_port *p);
  51 #if IS_ENABLED(CONFIG_IPV6)
  52 static void br_ip6_multicast_leave_group(struct net_bridge *br,
  53                                          struct net_bridge_port *port,
  54                                          const struct in6_addr *group,
  55                                          __u16 vid, const unsigned char *src);
  56 #endif
  57 unsigned int br_mdb_rehash_seq;
  58
  59 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
  60 {
  61         if (a->proto != b->proto)
  62                 return 0;
  63         if (a->vid != b->vid)
  64                 return 0;
  65         switch (a->proto) {
  66         case htons(ETH_P_IP):
  67                 return a->u.ip4 == b->u.ip4;
  68 #if IS_ENABLED(CONFIG_IPV6)
  69         case htons(ETH_P_IPV6):
  70                 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
  71 #endif
  72         }
  73         return 0;
  74 }
  75
  76 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
  77                                 __u16 vid)
  78 {
  79         return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
  80 }
  81
  82 #if IS_ENABLED(CONFIG_IPV6)
  83 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
  84                                 const struct in6_addr *ip,
  85                                 __u16 vid)
  86 {
  87         return jhash_2words(ipv6_addr_hash(ip), vid,
  88                             mdb->secret) & (mdb->max - 1);
  89 }
  90 #endif
  91
  92 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
  93                              struct br_ip *ip)
  94 {
  95         switch (ip->proto) {
  96         case htons(ETH_P_IP):
  97                 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
  98 #if IS_ENABLED(CONFIG_IPV6)
  99         case htons(ETH_P_IPV6):
 100                 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
 101 #endif
 102         }
 103         return 0;
 104 }
 105
 106 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
 107         struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
 108 {
 109         struct net_bridge_mdb_entry *mp;
 110
 111         hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 112                 if (br_ip_equal(&mp->addr, dst))
 113                         return mp;
 114         }
 115
 116         return NULL;
 117 }
 118
 119 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
 120                                            struct br_ip *dst)
 121 {
 122         if (!mdb)
 123                 return NULL;
 124
 125         return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
 126 }
 127
 128 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
 129         struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
 130 {
 131         struct br_ip br_dst;
 132
 133         br_dst.u.ip4 = dst;
 134         br_dst.proto = htons(ETH_P_IP);
 135         br_dst.vid = vid;
 136
 137         return br_mdb_ip_get(mdb, &br_dst);
 138 }
 139
 140 #if IS_ENABLED(CONFIG_IPV6)
 141 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
 142         struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
 143         __u16 vid)
 144 {
 145         struct br_ip br_dst;
 146
 147         br_dst.u.ip6 = *dst;
 148         br_dst.proto = htons(ETH_P_IPV6);
 149         br_dst.vid = vid;
 150
 151         return br_mdb_ip_get(mdb, &br_dst);
 152 }
 153 #endif
 154
 155 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 156                                         struct sk_buff *skb, u16 vid)
 157 {
 158         struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
 159         struct br_ip ip;
 160
 161         if (br->multicast_disabled)
 162                 return NULL;
 163
 164         if (BR_INPUT_SKB_CB(skb)->igmp)
 165                 return NULL;
 166
 167         ip.proto = skb->protocol;
 168         ip.vid = vid;
 169
 170         switch (skb->protocol) {
 171         case htons(ETH_P_IP):
 172                 ip.u.ip4 = ip_hdr(skb)->daddr;
 173                 break;
 174 #if IS_ENABLED(CONFIG_IPV6)
 175         case htons(ETH_P_IPV6):
 176                 ip.u.ip6 = ipv6_hdr(skb)->daddr;
 177                 break;
 178 #endif
 179         default:
 180                 return NULL;
 181         }
 182
 183         return br_mdb_ip_get(mdb, &ip);
 184 }
 185
 186 static void br_mdb_free(struct rcu_head *head)
 187 {
 188         struct net_bridge_mdb_htable *mdb =
 189                 container_of(head, struct net_bridge_mdb_htable, rcu);
 190         struct net_bridge_mdb_htable *old = mdb->old;
 191
 192         mdb->old = NULL;
 193         kfree(old->mhash);
 194         kfree(old);
 195 }
 196
 197 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
 198                        struct net_bridge_mdb_htable *old,
 199                        int elasticity)
 200 {
 201         struct net_bridge_mdb_entry *mp;
 202         int maxlen;
 203         int len;
 204         int i;
 205
 206         for (i = 0; i < old->max; i++)
 207                 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
 208                         hlist_add_head(&mp->hlist[new->ver],
 209                                        &new->mhash[br_ip_hash(new, &mp->addr)]);
 210
 211         if (!elasticity)
 212                 return 0;
 213
 214         maxlen = 0;
 215         for (i = 0; i < new->max; i++) {
 216                 len = 0;
 217                 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
 218                         len++;
 219                 if (len > maxlen)
 220                         maxlen = len;
 221         }
 222
 223         return maxlen > elasticity ? -EINVAL : 0;
 224 }
 225
 226 void br_multicast_free_pg(struct rcu_head *head)
 227 {
 228         struct net_bridge_port_group *p =
 229                 container_of(head, struct net_bridge_port_group, rcu);
 230
 231         kfree(p);
 232 }
 233
 234 static void br_multicast_free_group(struct rcu_head *head)
 235 {
 236         struct net_bridge_mdb_entry *mp =
 237                 container_of(head, struct net_bridge_mdb_entry, rcu);
 238
 239         kfree(mp);
 240 }
 241
 242 static void br_multicast_group_expired(unsigned long data)
 243 {
 244         struct net_bridge_mdb_entry *mp = (void *)data;
 245         struct net_bridge *br = mp->br;
 246         struct net_bridge_mdb_htable *mdb;
 247
 248         spin_lock(&br->multicast_lock);
 249         if (!netif_running(br->dev) || timer_pending(&mp->timer))
 250                 goto out;
 251
 252         mp->mglist = false;
 253
 254         if (mp->ports)
 255                 goto out;
 256
 257         mdb = mlock_dereference(br->mdb, br);
 258
 259         hlist_del_rcu(&mp->hlist[mdb->ver]);
 260         mdb->size--;
 261
 262         call_rcu_bh(&mp->rcu, br_multicast_free_group);
 263
 264 out:
 265         spin_unlock(&br->multicast_lock);
 266 }
 267
 268 static void br_multicast_del_pg(struct net_bridge *br,
 269                                 struct net_bridge_port_group *pg)
 270 {
 271         struct net_bridge_mdb_htable *mdb;
 272         struct net_bridge_mdb_entry *mp;
 273         struct net_bridge_port_group *p;
 274         struct net_bridge_port_group __rcu **pp;
 275
 276         mdb = mlock_dereference(br->mdb, br);
 277
 278         mp = br_mdb_ip_get(mdb, &pg->addr);
 279         if (WARN_ON(!mp))
 280                 return;
 281
 282         for (pp = &mp->ports;
 283              (p = mlock_dereference(*pp, br)) != NULL;
 284              pp = &p->next) {
 285                 if (p != pg)
 286                         continue;
 287
 288                 rcu_assign_pointer(*pp, p->next);
 289                 hlist_del_init(&p->mglist);
 290                 del_timer(&p->timer);
 291                 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
 292                               p->flags);
 293                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
 294
 295                 if (!mp->ports && !mp->mglist &&
 296                     netif_running(br->dev))
 297                         mod_timer(&mp->timer, jiffies);
 298
 299                 return;
 300         }
 301
 302         WARN_ON(1);
 303 }
 304
 305 static void br_multicast_port_group_expired(unsigned long data)
 306 {
 307         struct net_bridge_port_group *pg = (void *)data;
 308         struct net_bridge *br = pg->port->br;
 309
 310         spin_lock(&br->multicast_lock);
 311         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
 312             hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
 313                 goto out;
 314
 315         br_multicast_del_pg(br, pg);
 316
 317 out:
 318         spin_unlock(&br->multicast_lock);
 319 }
 320
 321 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
 322                          int elasticity)
 323 {
 324         struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
 325         struct net_bridge_mdb_htable *mdb;
 326         int err;
 327
 328         mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
 329         if (!mdb)
 330                 return -ENOMEM;
 331
 332         mdb->max = max;
 333         mdb->old = old;
 334
 335         mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
 336         if (!mdb->mhash) {
 337                 kfree(mdb);
 338                 return -ENOMEM;
 339         }
 340
 341         mdb->size = old ? old->size : 0;
 342         mdb->ver = old ? old->ver ^ 1 : 0;
 343
 344         if (!old || elasticity)
 345                 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
 346         else
 347                 mdb->secret = old->secret;
 348
 349         if (!old)
 350                 goto out;
 351
 352         err = br_mdb_copy(mdb, old, elasticity);
 353         if (err) {
 354                 kfree(mdb->mhash);
 355                 kfree(mdb);
 356                 return err;
 357         }
 358
 359         br_mdb_rehash_seq++;
 360         call_rcu_bh(&mdb->rcu, br_mdb_free);
 361
 362 out:
 363         rcu_assign_pointer(*mdbp, mdb);
 364
 365         return 0;
 366 }
 367
 368 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
 369                                                     __be32 group,
 370                                                     u8 *igmp_type)
 371 {
 372         struct igmpv3_query *ihv3;
 373         size_t igmp_hdr_size;
 374         struct sk_buff *skb;
 375         struct igmphdr *ih;
 376         struct ethhdr *eth;
 377         struct iphdr *iph;
 378
 379         igmp_hdr_size = sizeof(*ih);
 380         if (br->multicast_igmp_version == 3)
 381                 igmp_hdr_size = sizeof(*ihv3);
 382         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
 383                                                  igmp_hdr_size + 4);
 384         if (!skb)
 385                 goto out;
 386
 387         skb->protocol = htons(ETH_P_IP);
 388
 389         skb_reset_mac_header(skb);
 390         eth = eth_hdr(skb);
 391
 392         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 393         eth->h_dest[0] = 1;
 394         eth->h_dest[1] = 0;
 395         eth->h_dest[2] = 0x5e;
 396         eth->h_dest[3] = 0;
 397         eth->h_dest[4] = 0;
 398         eth->h_dest[5] = 1;
 399         eth->h_proto = htons(ETH_P_IP);
 400         skb_put(skb, sizeof(*eth));
 401
 402         skb_set_network_header(skb, skb->len);
 403         iph = ip_hdr(skb);
 404
 405         iph->version = 4;
 406         iph->ihl = 6;
 407         iph->tos = 0xc0;
 408         iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
 409         iph->id = 0;
 410         iph->frag_off = htons(IP_DF);
 411         iph->ttl = 1;
 412         iph->protocol = IPPROTO_IGMP;
 413         iph->saddr = br->multicast_query_use_ifaddr ?
 414                      inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
 415         iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 416         ((u8 *)&iph[1])[0] = IPOPT_RA;
 417         ((u8 *)&iph[1])[1] = 4;
 418         ((u8 *)&iph[1])[2] = 0;
 419         ((u8 *)&iph[1])[3] = 0;
 420         ip_send_check(iph);
 421         skb_put(skb, 24);
 422
 423         skb_set_transport_header(skb, skb->len);
 424         *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
 425
 426         switch (br->multicast_igmp_version) {
 427         case 2:
 428                 ih = igmp_hdr(skb);
 429                 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
 430                 ih->code = (group ? br->multicast_last_member_interval :
 431                                     br->multicast_query_response_interval) /
 432                            (HZ / IGMP_TIMER_SCALE);
 433                 ih->group = group;
 434                 ih->csum = 0;
 435                 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
 436                 break;
 437         case 3:
 438                 ihv3 = igmpv3_query_hdr(skb);
 439                 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
 440                 ihv3->code = (group ? br->multicast_last_member_interval :
 441                                       br->multicast_query_response_interval) /
 442                              (HZ / IGMP_TIMER_SCALE);
 443                 ihv3->group = group;
 444                 ihv3->qqic = br->multicast_query_interval / HZ;
 445                 ihv3->nsrcs = 0;
 446                 ihv3->resv = 0;
 447                 ihv3->suppress = 0;
 448                 ihv3->qrv = 2;
 449                 ihv3->csum = 0;
 450                 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
 451                 break;
 452         }
 453
 454         skb_put(skb, igmp_hdr_size);
 455         __skb_pull(skb, sizeof(*eth));
 456
 457 out:
 458         return skb;
 459 }
 460
 461 #if IS_ENABLED(CONFIG_IPV6)
 462 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
 463                                                     const struct in6_addr *grp,
 464                                                     u8 *igmp_type)
 465 {
 466         struct mld2_query *mld2q;
 467         unsigned long interval;
 468         struct ipv6hdr *ip6h;
 469         struct mld_msg *mldq;
 470         size_t mld_hdr_size;
 471         struct sk_buff *skb;
 472         struct ethhdr *eth;
 473         u8 *hopopt;
 474
 475         mld_hdr_size = sizeof(*mldq);
 476         if (br->multicast_mld_version == 2)
 477                 mld_hdr_size = sizeof(*mld2q);
 478         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
 479                                                  8 + mld_hdr_size);
 480         if (!skb)
 481                 goto out;
 482
 483         skb->protocol = htons(ETH_P_IPV6);
 484
 485         /* Ethernet header */
 486         skb_reset_mac_header(skb);
 487         eth = eth_hdr(skb);
 488
 489         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 490         eth->h_proto = htons(ETH_P_IPV6);
 491         skb_put(skb, sizeof(*eth));
 492
 493         /* IPv6 header + HbH option */
 494         skb_set_network_header(skb, skb->len);
 495         ip6h = ipv6_hdr(skb);
 496
 497         *(__force __be32 *)ip6h = htonl(0x60000000);
 498         ip6h->payload_len = htons(8 + mld_hdr_size);
 499         ip6h->nexthdr = IPPROTO_HOPOPTS;
 500         ip6h->hop_limit = 1;
 501         ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
 502         if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
 503                                &ip6h->saddr)) {
 504                 kfree_skb(skb);
 505                 br->has_ipv6_addr = 0;
 506                 return NULL;
 507         }
 508
 509         br->has_ipv6_addr = 1;
 510         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 511
 512         hopopt = (u8 *)(ip6h + 1);
 513         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
 514         hopopt[1] = 0;                          /* length of HbH */
 515         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
 516         hopopt[3] = 2;                          /* Length of RA Option */
 517         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
 518         hopopt[5] = 0;
 519         hopopt[6] = IPV6_TLV_PAD1;              /* Pad1 */
 520         hopopt[7] = IPV6_TLV_PAD1;              /* Pad1 */
 521
 522         skb_put(skb, sizeof(*ip6h) + 8);
 523
 524         /* ICMPv6 */
 525         skb_set_transport_header(skb, skb->len);
 526         interval = ipv6_addr_any(grp) ?
 527                         br->multicast_query_response_interval :
 528                         br->multicast_last_member_interval;
 529         *igmp_type = ICMPV6_MGM_QUERY;
 530         switch (br->multicast_mld_version) {
 531         case 1:
 532                 mldq = (struct mld_msg *)icmp6_hdr(skb);
 533                 mldq->mld_type = ICMPV6_MGM_QUERY;
 534                 mldq->mld_code = 0;
 535                 mldq->mld_cksum = 0;
 536                 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
 537                 mldq->mld_reserved = 0;
 538                 mldq->mld_mca = *grp;
 539                 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 540                                                   sizeof(*mldq), IPPROTO_ICMPV6,
 541                                                   csum_partial(mldq,
 542                                                                sizeof(*mldq),
 543                                                                0));
 544                 break;
 545         case 2:
 546                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
 547                 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
 548                 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
 549                 mld2q->mld2q_code = 0;
 550                 mld2q->mld2q_cksum = 0;
 551                 mld2q->mld2q_resv1 = 0;
 552                 mld2q->mld2q_resv2 = 0;
 553                 mld2q->mld2q_suppress = 0;
 554                 mld2q->mld2q_qrv = 2;
 555                 mld2q->mld2q_nsrcs = 0;
 556                 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
 557                 mld2q->mld2q_mca = *grp;
 558                 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 559                                                      sizeof(*mld2q),
 560                                                      IPPROTO_ICMPV6,
 561                                                      csum_partial(mld2q,
 562                                                                   sizeof(*mld2q),
 563                                                                   0));
 564                 break;
 565         }
 566         skb_put(skb, mld_hdr_size);
 567
 568         __skb_pull(skb, sizeof(*eth));
 569
 570 out:
 571         return skb;
 572 }
 573 #endif
 574
 575 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 576                                                 struct br_ip *addr,
 577                                                 u8 *igmp_type)
 578 {
 579         switch (addr->proto) {
 580         case htons(ETH_P_IP):
 581                 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
 582 #if IS_ENABLED(CONFIG_IPV6)
 583         case htons(ETH_P_IPV6):
 584                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
 585                                                     igmp_type);
 586 #endif
 587         }
 588         return NULL;
 589 }
 590
 591 static struct net_bridge_mdb_entry *br_multicast_get_group(
 592         struct net_bridge *br, struct net_bridge_port *port,
 593         struct br_ip *group, int hash)
 594 {
 595         struct net_bridge_mdb_htable *mdb;
 596         struct net_bridge_mdb_entry *mp;
 597         unsigned int count = 0;
 598         unsigned int max;
 599         int elasticity;
 600         int err;
 601
 602         mdb = rcu_dereference_protected(br->mdb, 1);
 603         hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 604                 count++;
 605                 if (unlikely(br_ip_equal(group, &mp->addr)))
 606                         return mp;
 607         }
 608
 609         elasticity = 0;
 610         max = mdb->max;
 611
 612         if (unlikely(count > br->hash_elasticity && count)) {
 613                 if (net_ratelimit())
 614                         br_info(br, "Multicast hash table "
 615                                 "chain limit reached: %s\n",
 616                                 port ? port->dev->name : br->dev->name);
 617
 618                 elasticity = br->hash_elasticity;
 619         }
 620
 621         if (mdb->size >= max) {
 622                 max *= 2;
 623                 if (unlikely(max > br->hash_max)) {
 624                         br_warn(br, "Multicast hash table maximum of %d "
 625                                 "reached, disabling snooping: %s\n",
 626                                 br->hash_max,
 627                                 port ? port->dev->name : br->dev->name);
 628                         err = -E2BIG;
 629 disable:
 630                         br->multicast_disabled = 1;
 631                         goto err;
 632                 }
 633         }
 634
 635         if (max > mdb->max || elasticity) {
 636                 if (mdb->old) {
 637                         if (net_ratelimit())
 638                                 br_info(br, "Multicast hash table "
 639                                         "on fire: %s\n",
 640                                         port ? port->dev->name : br->dev->name);
 641                         err = -EEXIST;
 642                         goto err;
 643                 }
 644
 645                 err = br_mdb_rehash(&br->mdb, max, elasticity);
 646                 if (err) {
 647                         br_warn(br, "Cannot rehash multicast "
 648                                 "hash table, disabling snooping: %s, %d, %d\n",
 649                                 port ? port->dev->name : br->dev->name,
 650                                 mdb->size, err);
 651                         goto disable;
 652                 }
 653
 654                 err = -EAGAIN;
 655                 goto err;
 656         }
 657
 658         return NULL;
 659
 660 err:
 661         mp = ERR_PTR(err);
 662         return mp;
 663 }
 664
 665 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 666                                                     struct net_bridge_port *p,
 667                                                     struct br_ip *group)
 668 {
 669         struct net_bridge_mdb_htable *mdb;
 670         struct net_bridge_mdb_entry *mp;
 671         int hash;
 672         int err;
 673
 674         mdb = rcu_dereference_protected(br->mdb, 1);
 675         if (!mdb) {
 676                 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
 677                 if (err)
 678                         return ERR_PTR(err);
 679                 goto rehash;
 680         }
 681
 682         hash = br_ip_hash(mdb, group);
 683         mp = br_multicast_get_group(br, p, group, hash);
 684         switch (PTR_ERR(mp)) {
 685         case 0:
 686                 break;
 687
 688         case -EAGAIN:
 689 rehash:
 690                 mdb = rcu_dereference_protected(br->mdb, 1);
 691                 hash = br_ip_hash(mdb, group);
 692                 break;
 693
 694         default:
 695                 goto out;
 696         }
 697
 698         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 699         if (unlikely(!mp))
 700                 return ERR_PTR(-ENOMEM);
 701
 702         mp->br = br;
 703         mp->addr = *group;
 704         setup_timer(&mp->timer, br_multicast_group_expired,
 705                     (unsigned long)mp);
 706
 707         hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
 708         mdb->size++;
 709
 710 out:
 711         return mp;
 712 }
 713
 714 struct net_bridge_port_group *br_multicast_new_port_group(
 715                         struct net_bridge_port *port,
 716                         struct br_ip *group,
 717                         struct net_bridge_port_group __rcu *next,
 718                         unsigned char flags,
 719                         const unsigned char *src)
 720 {
 721         struct net_bridge_port_group *p;
 722
 723         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 724         if (unlikely(!p))
 725                 return NULL;
 726
 727         p->addr = *group;
 728         p->port = port;
 729         p->flags = flags;
 730         rcu_assign_pointer(p->next, next);
 731         hlist_add_head(&p->mglist, &port->mglist);
 732         setup_timer(&p->timer, br_multicast_port_group_expired,
 733                     (unsigned long)p);
 734
 735         if (src)
 736                 memcpy(p->eth_addr, src, ETH_ALEN);
 737         else
 738                 memset(p->eth_addr, 0xff, ETH_ALEN);
 739
 740         return p;
 741 }
 742
 743 static bool br_port_group_equal(struct net_bridge_port_group *p,
 744                                 struct net_bridge_port *port,
 745                                 const unsigned char *src)
 746 {
 747         if (p->port != port)
 748                 return false;
 749
 750         if (!(port->flags & BR_MULTICAST_TO_UNICAST))
 751                 return true;
 752
 753         return ether_addr_equal(src, p->eth_addr);
 754 }
 755
 756 static int br_multicast_add_group(struct net_bridge *br,
 757                                   struct net_bridge_port *port,
 758                                   struct br_ip *group,
 759                                   const unsigned char *src)
 760 {
 761         struct net_bridge_port_group __rcu **pp;
 762         struct net_bridge_port_group *p;
 763         struct net_bridge_mdb_entry *mp;
 764         unsigned long now = jiffies;
 765         int err;
 766
 767         spin_lock(&br->multicast_lock);
 768         if (!netif_running(br->dev) ||
 769             (port && port->state == BR_STATE_DISABLED))
 770                 goto out;
 771
 772         mp = br_multicast_new_group(br, port, group);
 773         err = PTR_ERR(mp);
 774         if (IS_ERR(mp))
 775                 goto err;
 776
 777         if (!port) {
 778                 mp->mglist = true;
 779                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
 780                 goto out;
 781         }
 782
 783         for (pp = &mp->ports;
 784              (p = mlock_dereference(*pp, br)) != NULL;
 785              pp = &p->next) {
 786                 if (br_port_group_equal(p, port, src))
 787                         goto found;
 788                 if ((unsigned long)p->port < (unsigned long)port)
 789                         break;
 790         }
 791
 792         p = br_multicast_new_port_group(port, group, *pp, 0, src);
 793         if (unlikely(!p))
 794                 goto err;
 795         rcu_assign_pointer(*pp, p);
 796         br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
 797
 798 found:
 799         mod_timer(&p->timer, now + br->multicast_membership_interval);
 800 out:
 801         err = 0;
 802
 803 err:
 804         spin_unlock(&br->multicast_lock);
 805         return err;
 806 }
 807
 808 static int br_ip4_multicast_add_group(struct net_bridge *br,
 809                                       struct net_bridge_port *port,
 810                                       __be32 group,
 811                                       __u16 vid,
 812                                       const unsigned char *src)
 813 {
 814         struct br_ip br_group;
 815
 816         if (ipv4_is_local_multicast(group))
 817                 return 0;
 818
 819         br_group.u.ip4 = group;
 820         br_group.proto = htons(ETH_P_IP);
 821         br_group.vid = vid;
 822
 823         return br_multicast_add_group(br, port, &br_group, src);
 824 }
 825
 826 #if IS_ENABLED(CONFIG_IPV6)
 827 static int br_ip6_multicast_add_group(struct net_bridge *br,
 828                                       struct net_bridge_port *port,
 829                                       const struct in6_addr *group,
 830                                       __u16 vid,
 831                                       const unsigned char *src)
 832 {
 833         struct br_ip br_group;
 834
 835         if (ipv6_addr_is_ll_all_nodes(group))
 836                 return 0;
 837
 838         br_group.u.ip6 = *group;
 839         br_group.proto = htons(ETH_P_IPV6);
 840         br_group.vid = vid;
 841
 842         return br_multicast_add_group(br, port, &br_group, src);
 843 }
 844 #endif
 845
 846 static void br_multicast_router_expired(unsigned long data)
 847 {
 848         struct net_bridge_port *port = (void *)data;
 849         struct net_bridge *br = port->br;
 850
 851         spin_lock(&br->multicast_lock);
 852         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
 853             port->multicast_router == MDB_RTR_TYPE_PERM ||
 854             timer_pending(&port->multicast_router_timer))
 855                 goto out;
 856
 857         __del_port_router(port);
 858 out:
 859         spin_unlock(&br->multicast_lock);
 860 }
 861
 862 static void br_multicast_local_router_expired(unsigned long data)
 863 {
 864 }
 865
 866 static void br_multicast_querier_expired(struct net_bridge *br,
 867                                          struct bridge_mcast_own_query *query)
 868 {
 869         spin_lock(&br->multicast_lock);
 870         if (!netif_running(br->dev) || br->multicast_disabled)
 871                 goto out;
 872
 873         br_multicast_start_querier(br, query);
 874
 875 out:
 876         spin_unlock(&br->multicast_lock);
 877 }
 878
 879 static void br_ip4_multicast_querier_expired(unsigned long data)
 880 {
 881         struct net_bridge *br = (void *)data;
 882
 883         br_multicast_querier_expired(br, &br->ip4_own_query);
 884 }
 885
 886 #if IS_ENABLED(CONFIG_IPV6)
 887 static void br_ip6_multicast_querier_expired(unsigned long data)
 888 {
 889         struct net_bridge *br = (void *)data;
 890
 891         br_multicast_querier_expired(br, &br->ip6_own_query);
 892 }
 893 #endif
 894
 895 static void br_multicast_select_own_querier(struct net_bridge *br,
 896                                             struct br_ip *ip,
 897                                             struct sk_buff *skb)
 898 {
 899         if (ip->proto == htons(ETH_P_IP))
 900                 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
 901 #if IS_ENABLED(CONFIG_IPV6)
 902         else
 903                 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
 904 #endif
 905 }
 906
 907 static void __br_multicast_send_query(struct net_bridge *br,
 908                                       struct net_bridge_port *port,
 909                                       struct br_ip *ip)
 910 {
 911         struct sk_buff *skb;
 912         u8 igmp_type;
 913
 914         skb = br_multicast_alloc_query(br, ip, &igmp_type);
 915         if (!skb)
 916                 return;
 917
 918         if (port) {
 919                 skb->dev = port->dev;
 920                 br_multicast_count(br, port, skb, igmp_type,
 921                                    BR_MCAST_DIR_TX);
 922                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
 923                         dev_net(port->dev), NULL, skb, NULL, skb->dev,
 924                         br_dev_queue_push_xmit);
 925         } else {
 926                 br_multicast_select_own_querier(br, ip, skb);
 927                 br_multicast_count(br, port, skb, igmp_type,
 928                                    BR_MCAST_DIR_RX);
 929                 netif_rx(skb);
 930         }
 931 }
 932
 933 static void br_multicast_send_query(struct net_bridge *br,
 934                                     struct net_bridge_port *port,
 935                                     struct bridge_mcast_own_query *own_query)
 936 {
 937         struct bridge_mcast_other_query *other_query = NULL;
 938         struct br_ip br_group;
 939         unsigned long time;
 940
 941         if (!netif_running(br->dev) || br->multicast_disabled ||
 942             !br->multicast_querier)
 943                 return;
 944
 945         memset(&br_group.u, 0, sizeof(br_group.u));
 946
 947         if (port ? (own_query == &port->ip4_own_query) :
 948                    (own_query == &br->ip4_own_query)) {
 949                 other_query = &br->ip4_other_query;
 950                 br_group.proto = htons(ETH_P_IP);
 951 #if IS_ENABLED(CONFIG_IPV6)
 952         } else {
 953                 other_query = &br->ip6_other_query;
 954                 br_group.proto = htons(ETH_P_IPV6);
 955 #endif
 956         }
 957
 958         if (!other_query || timer_pending(&other_query->timer))
 959                 return;
 960
 961         __br_multicast_send_query(br, port, &br_group);
 962
 963         time = jiffies;
 964         time += own_query->startup_sent < br->multicast_startup_query_count ?
 965                 br->multicast_startup_query_interval :
 966                 br->multicast_query_interval;
 967         mod_timer(&own_query->timer, time);
 968 }
 969
 970 static void
 971 br_multicast_port_query_expired(struct net_bridge_port *port,
 972                                 struct bridge_mcast_own_query *query)
 973 {
 974         struct net_bridge *br = port->br;
 975
 976         spin_lock(&br->multicast_lock);
 977         if (port->state == BR_STATE_DISABLED ||
 978             port->state == BR_STATE_BLOCKING)
 979                 goto out;
 980
 981         if (query->startup_sent < br->multicast_startup_query_count)
 982                 query->startup_sent++;
 983
 984         br_multicast_send_query(port->br, port, query);
 985
 986 out:
 987         spin_unlock(&br->multicast_lock);
 988 }
 989
 990 static void br_ip4_multicast_port_query_expired(unsigned long data)
 991 {
 992         struct net_bridge_port *port = (void *)data;
 993
 994         br_multicast_port_query_expired(port, &port->ip4_own_query);
 995 }
 996
 997 #if IS_ENABLED(CONFIG_IPV6)
 998 static void br_ip6_multicast_port_query_expired(unsigned long data)
 999 {
1000         struct net_bridge_port *port = (void *)data;
1001
1002         br_multicast_port_query_expired(port, &port->ip6_own_query);
1003 }
1004 #endif
1005
1006 static void br_mc_disabled_update(struct net_device *dev, bool value)
1007 {
1008         struct switchdev_attr attr = {
1009                 .orig_dev = dev,
1010                 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1011                 .flags = SWITCHDEV_F_DEFER,
1012                 .u.mc_disabled = value,
1013         };
1014
1015         switchdev_port_attr_set(dev, &attr);
1016 }
1017
1018 int br_multicast_add_port(struct net_bridge_port *port)
1019 {
1020         port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1021
1022         setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
1023                     (unsigned long)port);
1024         setup_timer(&port->ip4_own_query.timer,
1025                     br_ip4_multicast_port_query_expired, (unsigned long)port);
1026 #if IS_ENABLED(CONFIG_IPV6)
1027         setup_timer(&port->ip6_own_query.timer,
1028                     br_ip6_multicast_port_query_expired, (unsigned long)port);
1029 #endif
1030         br_mc_disabled_update(port->dev, port->br->multicast_disabled);
1031
1032         port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
1033         if (!port->mcast_stats)
1034                 return -ENOMEM;
1035
1036         return 0;
1037 }
1038
1039 void br_multicast_del_port(struct net_bridge_port *port)
1040 {
1041         struct net_bridge *br = port->br;
1042         struct net_bridge_port_group *pg;
1043         struct hlist_node *n;
1044
1045         /* Take care of the remaining groups, only perm ones should be left */
1046         spin_lock_bh(&br->multicast_lock);
1047         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1048                 br_multicast_del_pg(br, pg);
1049         spin_unlock_bh(&br->multicast_lock);
1050         del_timer_sync(&port->multicast_router_timer);
1051         free_percpu(port->mcast_stats);
1052 }
1053
1054 static void br_multicast_enable(struct bridge_mcast_own_query *query)
1055 {
1056         query->startup_sent = 0;
1057
1058         if (try_to_del_timer_sync(&query->timer) >= 0 ||
1059             del_timer(&query->timer))
1060                 mod_timer(&query->timer, jiffies);
1061 }
1062
1063 static void __br_multicast_enable_port(struct net_bridge_port *port)
1064 {
1065         struct net_bridge *br = port->br;
1066
1067         if (br->multicast_disabled || !netif_running(br->dev))
1068                 return;
1069
1070         br_multicast_enable(&port->ip4_own_query);
1071 #if IS_ENABLED(CONFIG_IPV6)
1072         br_multicast_enable(&port->ip6_own_query);
1073 #endif
1074         if (port->multicast_router == MDB_RTR_TYPE_PERM &&
1075             hlist_unhashed(&port->rlist))
1076                 br_multicast_add_router(br, port);
1077 }
1078
1079 void br_multicast_enable_port(struct net_bridge_port *port)
1080 {
1081         struct net_bridge *br = port->br;
1082
1083         spin_lock(&br->multicast_lock);
1084         __br_multicast_enable_port(port);
1085         spin_unlock(&br->multicast_lock);
1086 }
1087
1088 void br_multicast_disable_port(struct net_bridge_port *port)
1089 {
1090         struct net_bridge *br = port->br;
1091         struct net_bridge_port_group *pg;
1092         struct hlist_node *n;
1093
1094         spin_lock(&br->multicast_lock);
1095         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1096                 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1097                         br_multicast_del_pg(br, pg);
1098
1099         __del_port_router(port);
1100
1101         del_timer(&port->multicast_router_timer);
1102         del_timer(&port->ip4_own_query.timer);
1103 #if IS_ENABLED(CONFIG_IPV6)
1104         del_timer(&port->ip6_own_query.timer);
1105 #endif
1106         spin_unlock(&br->multicast_lock);
1107 }
1108
1109 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1110                                          struct net_bridge_port *port,
1111                                          struct sk_buff *skb,
1112                                          u16 vid)
1113 {
1114         const unsigned char *src;
1115         struct igmpv3_report *ih;
1116         struct igmpv3_grec *grec;
1117         int i;
1118         int len;
1119         int num;
1120         int type;
1121         int err = 0;
1122         __be32 group;
1123
1124         ih = igmpv3_report_hdr(skb);
1125         num = ntohs(ih->ngrec);
1126         len = skb_transport_offset(skb) + sizeof(*ih);
1127
1128         for (i = 0; i < num; i++) {
1129                 len += sizeof(*grec);
1130                 if (!pskb_may_pull(skb, len))
1131                         return -EINVAL;
1132
1133                 grec = (void *)(skb->data + len - sizeof(*grec));
1134                 group = grec->grec_mca;
1135                 type = grec->grec_type;
1136
1137                 len += ntohs(grec->grec_nsrcs) * 4;
1138                 if (!pskb_may_pull(skb, len))
1139                         return -EINVAL;
1140
1141                 /* We treat this as an IGMPv2 report for now. */
1142                 switch (type) {
1143                 case IGMPV3_MODE_IS_INCLUDE:
1144                 case IGMPV3_MODE_IS_EXCLUDE:
1145                 case IGMPV3_CHANGE_TO_INCLUDE:
1146                 case IGMPV3_CHANGE_TO_EXCLUDE:
1147                 case IGMPV3_ALLOW_NEW_SOURCES:
1148                 case IGMPV3_BLOCK_OLD_SOURCES:
1149                         break;
1150
1151                 default:
1152                         continue;
1153                 }
1154
1155                 src = eth_hdr(skb)->h_source;
1156                 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1157                      type == IGMPV3_MODE_IS_INCLUDE) &&
1158                     ntohs(grec->grec_nsrcs) == 0) {
1159                         br_ip4_multicast_leave_group(br, port, group, vid, src);
1160                 } else {
1161                         err = br_ip4_multicast_add_group(br, port, group, vid,
1162                                                          src);
1163                         if (err)
1164                                 break;
1165                 }
1166         }
1167
1168         return err;
1169 }
1170
1171 #if IS_ENABLED(CONFIG_IPV6)
1172 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1173                                         struct net_bridge_port *port,
1174                                         struct sk_buff *skb,
1175                                         u16 vid)
1176 {
1177         const unsigned char *src;
1178         struct icmp6hdr *icmp6h;
1179         struct mld2_grec *grec;
1180         int i;
1181         int len;
1182         int num;
1183         int err = 0;
1184
1185         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1186                 return -EINVAL;
1187
1188         icmp6h = icmp6_hdr(skb);
1189         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1190         len = skb_transport_offset(skb) + sizeof(*icmp6h);
1191
1192         for (i = 0; i < num; i++) {
1193                 __be16 *nsrcs, _nsrcs;
1194
1195                 nsrcs = skb_header_pointer(skb,
1196                                            len + offsetof(struct mld2_grec,
1197                                                           grec_nsrcs),
1198                                            sizeof(_nsrcs), &_nsrcs);
1199                 if (!nsrcs)
1200                         return -EINVAL;
1201
1202                 if (!pskb_may_pull(skb,
1203                                    len + sizeof(*grec) +
1204                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
1205                         return -EINVAL;
1206
1207                 grec = (struct mld2_grec *)(skb->data + len);
1208                 len += sizeof(*grec) +
1209                        sizeof(struct in6_addr) * ntohs(*nsrcs);
1210
1211                 /* We treat these as MLDv1 reports for now. */
1212                 switch (grec->grec_type) {
1213                 case MLD2_MODE_IS_INCLUDE:
1214                 case MLD2_MODE_IS_EXCLUDE:
1215                 case MLD2_CHANGE_TO_INCLUDE:
1216                 case MLD2_CHANGE_TO_EXCLUDE:
1217                 case MLD2_ALLOW_NEW_SOURCES:
1218                 case MLD2_BLOCK_OLD_SOURCES:
1219                         break;
1220
1221                 default:
1222                         continue;
1223                 }
1224
1225                 src = eth_hdr(skb)->h_source;
1226                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1227                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1228                     ntohs(*nsrcs) == 0) {
1229                         br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1230                                                      vid, src);
1231                 } else {
1232                         err = br_ip6_multicast_add_group(br, port,
1233                                                          &grec->grec_mca, vid,
1234                                                          src);
1235                         if (err)
1236                                 break;
1237                 }
1238         }
1239
1240         return err;
1241 }
1242 #endif
1243
1244 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1245                                             struct net_bridge_port *port,
1246                                             __be32 saddr)
1247 {
1248         if (!timer_pending(&br->ip4_own_query.timer) &&
1249             !timer_pending(&br->ip4_other_query.timer))
1250                 goto update;
1251
1252         if (!br->ip4_querier.addr.u.ip4)
1253                 goto update;
1254
1255         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1256                 goto update;
1257
1258         return false;
1259
1260 update:
1261         br->ip4_querier.addr.u.ip4 = saddr;
1262
1263         /* update protected by general multicast_lock by caller */
1264         rcu_assign_pointer(br->ip4_querier.port, port);
1265
1266         return true;
1267 }
1268
1269 #if IS_ENABLED(CONFIG_IPV6)
1270 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1271                                             struct net_bridge_port *port,
1272                                             struct in6_addr *saddr)
1273 {
1274         if (!timer_pending(&br->ip6_own_query.timer) &&
1275             !timer_pending(&br->ip6_other_query.timer))
1276                 goto update;
1277
1278         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1279                 goto update;
1280
1281         return false;
1282
1283 update:
1284         br->ip6_querier.addr.u.ip6 = *saddr;
1285
1286         /* update protected by general multicast_lock by caller */
1287         rcu_assign_pointer(br->ip6_querier.port, port);
1288
1289         return true;
1290 }
1291 #endif
1292
1293 static bool br_multicast_select_querier(struct net_bridge *br,
1294                                         struct net_bridge_port *port,
1295                                         struct br_ip *saddr)
1296 {
1297         switch (saddr->proto) {
1298         case htons(ETH_P_IP):
1299                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1300 #if IS_ENABLED(CONFIG_IPV6)
1301         case htons(ETH_P_IPV6):
1302                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1303 #endif
1304         }
1305
1306         return false;
1307 }
1308
1309 static void
1310 br_multicast_update_query_timer(struct net_bridge *br,
1311                                 struct bridge_mcast_other_query *query,
1312                                 unsigned long max_delay)
1313 {
1314         if (!timer_pending(&query->timer))
1315                 query->delay_time = jiffies + max_delay;
1316
1317         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1318 }
1319
1320 static void br_port_mc_router_state_change(struct net_bridge_port *p,
1321                                            bool is_mc_router)
1322 {
1323         struct switchdev_attr attr = {
1324                 .orig_dev = p->dev,
1325                 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1326                 .flags = SWITCHDEV_F_DEFER,
1327                 .u.mrouter = is_mc_router,
1328         };
1329
1330         switchdev_port_attr_set(p->dev, &attr);
1331 }
1332
1333 /*
1334  * Add port to router_list
1335  *  list is maintained ordered by pointer value
1336  *  and locked by br->multicast_lock and RCU
1337  */
1338 static void br_multicast_add_router(struct net_bridge *br,
1339                                     struct net_bridge_port *port)
1340 {
1341         struct net_bridge_port *p;
1342         struct hlist_node *slot = NULL;
1343
1344         if (!hlist_unhashed(&port->rlist))
1345                 return;
1346
1347         hlist_for_each_entry(p, &br->router_list, rlist) {
1348                 if ((unsigned long) port >= (unsigned long) p)
1349                         break;
1350                 slot = &p->rlist;
1351         }
1352
1353         if (slot)
1354                 hlist_add_behind_rcu(&port->rlist, slot);
1355         else
1356                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1357         br_rtr_notify(br->dev, port, RTM_NEWMDB);
1358         br_port_mc_router_state_change(port, true);
1359 }
1360
1361 static void br_multicast_mark_router(struct net_bridge *br,
1362                                      struct net_bridge_port *port)
1363 {
1364         unsigned long now = jiffies;
1365
1366         if (!port) {
1367                 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1368                         mod_timer(&br->multicast_router_timer,
1369                                   now + br->multicast_querier_interval);
1370                 return;
1371         }
1372
1373         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1374             port->multicast_router == MDB_RTR_TYPE_PERM)
1375                 return;
1376
1377         br_multicast_add_router(br, port);
1378
1379         mod_timer(&port->multicast_router_timer,
1380                   now + br->multicast_querier_interval);
1381 }
1382
1383 static void br_multicast_query_received(struct net_bridge *br,
1384                                         struct net_bridge_port *port,
1385                                         struct bridge_mcast_other_query *query,
1386                                         struct br_ip *saddr,
1387                                         unsigned long max_delay)
1388 {
1389         if (!br_multicast_select_querier(br, port, saddr))
1390                 return;
1391
1392         br_multicast_update_query_timer(br, query, max_delay);
1393         br_multicast_mark_router(br, port);
1394 }
1395
1396 static int br_ip4_multicast_query(struct net_bridge *br,
1397                                   struct net_bridge_port *port,
1398                                   struct sk_buff *skb,
1399                                   u16 vid)
1400 {
1401         const struct iphdr *iph = ip_hdr(skb);
1402         struct igmphdr *ih = igmp_hdr(skb);
1403         struct net_bridge_mdb_entry *mp;
1404         struct igmpv3_query *ih3;
1405         struct net_bridge_port_group *p;
1406         struct net_bridge_port_group __rcu **pp;
1407         struct br_ip saddr;
1408         unsigned long max_delay;
1409         unsigned long now = jiffies;
1410         unsigned int offset = skb_transport_offset(skb);
1411         __be32 group;
1412         int err = 0;
1413
1414         spin_lock(&br->multicast_lock);
1415         if (!netif_running(br->dev) ||
1416             (port && port->state == BR_STATE_DISABLED))
1417                 goto out;
1418
1419         group = ih->group;
1420
1421         if (skb->len == offset + sizeof(*ih)) {
1422                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1423
1424                 if (!max_delay) {
1425                         max_delay = 10 * HZ;
1426                         group = 0;
1427                 }
1428         } else if (skb->len >= offset + sizeof(*ih3)) {
1429                 ih3 = igmpv3_query_hdr(skb);
1430                 if (ih3->nsrcs)
1431                         goto out;
1432
1433                 max_delay = ih3->code ?
1434                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1435         } else {
1436                 goto out;
1437         }
1438
1439         if (!group) {
1440                 saddr.proto = htons(ETH_P_IP);
1441                 saddr.u.ip4 = iph->saddr;
1442
1443                 br_multicast_query_received(br, port, &br->ip4_other_query,
1444                                             &saddr, max_delay);
1445                 goto out;
1446         }
1447
1448         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1449         if (!mp)
1450                 goto out;
1451
1452         max_delay *= br->multicast_last_member_count;
1453
1454         if (mp->mglist &&
1455             (timer_pending(&mp->timer) ?
1456              time_after(mp->timer.expires, now + max_delay) :
1457              try_to_del_timer_sync(&mp->timer) >= 0))
1458                 mod_timer(&mp->timer, now + max_delay);
1459
1460         for (pp = &mp->ports;
1461              (p = mlock_dereference(*pp, br)) != NULL;
1462              pp = &p->next) {
1463                 if (timer_pending(&p->timer) ?
1464                     time_after(p->timer.expires, now + max_delay) :
1465                     try_to_del_timer_sync(&p->timer) >= 0)
1466                         mod_timer(&p->timer, now + max_delay);
1467         }
1468
1469 out:
1470         spin_unlock(&br->multicast_lock);
1471         return err;
1472 }
1473
1474 #if IS_ENABLED(CONFIG_IPV6)
1475 static int br_ip6_multicast_query(struct net_bridge *br,
1476                                   struct net_bridge_port *port,
1477                                   struct sk_buff *skb,
1478                                   u16 vid)
1479 {
1480         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1481         struct mld_msg *mld;
1482         struct net_bridge_mdb_entry *mp;
1483         struct mld2_query *mld2q;
1484         struct net_bridge_port_group *p;
1485         struct net_bridge_port_group __rcu **pp;
1486         struct br_ip saddr;
1487         unsigned long max_delay;
1488         unsigned long now = jiffies;
1489         unsigned int offset = skb_transport_offset(skb);
1490         const struct in6_addr *group = NULL;
1491         bool is_general_query;
1492         int err = 0;
1493
1494         spin_lock(&br->multicast_lock);
1495         if (!netif_running(br->dev) ||
1496             (port && port->state == BR_STATE_DISABLED))
1497                 goto out;
1498
1499         if (skb->len == offset + sizeof(*mld)) {
1500                 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1501                         err = -EINVAL;
1502                         goto out;
1503                 }
1504                 mld = (struct mld_msg *) icmp6_hdr(skb);
1505                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1506                 if (max_delay)
1507                         group = &mld->mld_mca;
1508         } else {
1509                 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1510                         err = -EINVAL;
1511                         goto out;
1512                 }
1513                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1514                 if (!mld2q->mld2q_nsrcs)
1515                         group = &mld2q->mld2q_mca;
1516
1517                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1518         }
1519
1520         is_general_query = group && ipv6_addr_any(group);
1521
1522         if (is_general_query) {
1523                 saddr.proto = htons(ETH_P_IPV6);
1524                 saddr.u.ip6 = ip6h->saddr;
1525
1526                 br_multicast_query_received(br, port, &br->ip6_other_query,
1527                                             &saddr, max_delay);
1528                 goto out;
1529         } else if (!group) {
1530                 goto out;
1531         }
1532
1533         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1534         if (!mp)
1535                 goto out;
1536
1537         max_delay *= br->multicast_last_member_count;
1538         if (mp->mglist &&
1539             (timer_pending(&mp->timer) ?
1540              time_after(mp->timer.expires, now + max_delay) :
1541              try_to_del_timer_sync(&mp->timer) >= 0))
1542                 mod_timer(&mp->timer, now + max_delay);
1543
1544         for (pp = &mp->ports;
1545              (p = mlock_dereference(*pp, br)) != NULL;
1546              pp = &p->next) {
1547                 if (timer_pending(&p->timer) ?
1548                     time_after(p->timer.expires, now + max_delay) :
1549                     try_to_del_timer_sync(&p->timer) >= 0)
1550                         mod_timer(&p->timer, now + max_delay);
1551         }
1552
1553 out:
1554         spin_unlock(&br->multicast_lock);
1555         return err;
1556 }
1557 #endif
1558
1559 static void
1560 br_multicast_leave_group(struct net_bridge *br,
1561                          struct net_bridge_port *port,
1562                          struct br_ip *group,
1563                          struct bridge_mcast_other_query *other_query,
1564                          struct bridge_mcast_own_query *own_query,
1565                          const unsigned char *src)
1566 {
1567         struct net_bridge_mdb_htable *mdb;
1568         struct net_bridge_mdb_entry *mp;
1569         struct net_bridge_port_group *p;
1570         unsigned long now;
1571         unsigned long time;
1572
1573         spin_lock(&br->multicast_lock);
1574         if (!netif_running(br->dev) ||
1575             (port && port->state == BR_STATE_DISABLED))
1576                 goto out;
1577
1578         mdb = mlock_dereference(br->mdb, br);
1579         mp = br_mdb_ip_get(mdb, group);
1580         if (!mp)
1581                 goto out;
1582
1583         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1584                 struct net_bridge_port_group __rcu **pp;
1585
1586                 for (pp = &mp->ports;
1587                      (p = mlock_dereference(*pp, br)) != NULL;
1588                      pp = &p->next) {
1589                         if (!br_port_group_equal(p, port, src))
1590                                 continue;
1591
1592                         rcu_assign_pointer(*pp, p->next);
1593                         hlist_del_init(&p->mglist);
1594                         del_timer(&p->timer);
1595                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1596                         br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1597                                       p->flags);
1598
1599                         if (!mp->ports && !mp->mglist &&
1600                             netif_running(br->dev))
1601                                 mod_timer(&mp->timer, jiffies);
1602                 }
1603                 goto out;
1604         }
1605
1606         if (timer_pending(&other_query->timer))
1607                 goto out;
1608
1609         if (br->multicast_querier) {
1610                 __br_multicast_send_query(br, port, &mp->addr);
1611
1612                 time = jiffies + br->multicast_last_member_count *
1613                                  br->multicast_last_member_interval;
1614
1615                 mod_timer(&own_query->timer, time);
1616
1617                 for (p = mlock_dereference(mp->ports, br);
1618                      p != NULL;
1619                      p = mlock_dereference(p->next, br)) {
1620                         if (!br_port_group_equal(p, port, src))
1621                                 continue;
1622
1623                         if (!hlist_unhashed(&p->mglist) &&
1624                             (timer_pending(&p->timer) ?
1625                              time_after(p->timer.expires, time) :
1626                              try_to_del_timer_sync(&p->timer) >= 0)) {
1627                                 mod_timer(&p->timer, time);
1628                         }
1629
1630                         break;
1631                 }
1632         }
1633
1634         now = jiffies;
1635         time = now + br->multicast_last_member_count *
1636                      br->multicast_last_member_interval;
1637
1638         if (!port) {
1639                 if (mp->mglist &&
1640                     (timer_pending(&mp->timer) ?
1641                      time_after(mp->timer.expires, time) :
1642                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1643                         mod_timer(&mp->timer, time);
1644                 }
1645
1646                 goto out;
1647         }
1648
1649         for (p = mlock_dereference(mp->ports, br);
1650              p != NULL;
1651              p = mlock_dereference(p->next, br)) {
1652                 if (p->port != port)
1653                         continue;
1654
1655                 if (!hlist_unhashed(&p->mglist) &&
1656                     (timer_pending(&p->timer) ?
1657                      time_after(p->timer.expires, time) :
1658                      try_to_del_timer_sync(&p->timer) >= 0)) {
1659                         mod_timer(&p->timer, time);
1660                 }
1661
1662                 break;
1663         }
1664 out:
1665         spin_unlock(&br->multicast_lock);
1666 }
1667
1668 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1669                                          struct net_bridge_port *port,
1670                                          __be32 group,
1671                                          __u16 vid,
1672                                          const unsigned char *src)
1673 {
1674         struct br_ip br_group;
1675         struct bridge_mcast_own_query *own_query;
1676
1677         if (ipv4_is_local_multicast(group))
1678                 return;
1679
1680         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1681
1682         br_group.u.ip4 = group;
1683         br_group.proto = htons(ETH_P_IP);
1684         br_group.vid = vid;
1685
1686         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1687                                  own_query, src);
1688 }
1689
1690 #if IS_ENABLED(CONFIG_IPV6)
1691 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1692                                          struct net_bridge_port *port,
1693                                          const struct in6_addr *group,
1694                                          __u16 vid,
1695                                          const unsigned char *src)
1696 {
1697         struct br_ip br_group;
1698         struct bridge_mcast_own_query *own_query;
1699
1700         if (ipv6_addr_is_ll_all_nodes(group))
1701                 return;
1702
1703         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1704
1705         br_group.u.ip6 = *group;
1706         br_group.proto = htons(ETH_P_IPV6);
1707         br_group.vid = vid;
1708
1709         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1710                                  own_query, src);
1711 }
1712 #endif
1713
1714 static void br_multicast_err_count(const struct net_bridge *br,
1715                                    const struct net_bridge_port *p,
1716                                    __be16 proto)
1717 {
1718         struct bridge_mcast_stats __percpu *stats;
1719         struct bridge_mcast_stats *pstats;
1720
1721         if (!br->multicast_stats_enabled)
1722                 return;
1723
1724         if (p)
1725                 stats = p->mcast_stats;
1726         else
1727                 stats = br->mcast_stats;
1728         if (WARN_ON(!stats))
1729                 return;
1730
1731         pstats = this_cpu_ptr(stats);
1732
1733         u64_stats_update_begin(&pstats->syncp);
1734         switch (proto) {
1735         case htons(ETH_P_IP):
1736                 pstats->mstats.igmp_parse_errors++;
1737                 break;
1738 #if IS_ENABLED(CONFIG_IPV6)
1739         case htons(ETH_P_IPV6):
1740                 pstats->mstats.mld_parse_errors++;
1741                 break;
1742 #endif
1743         }
1744         u64_stats_update_end(&pstats->syncp);
1745 }
1746
1747 static void br_multicast_pim(struct net_bridge *br,
1748                              struct net_bridge_port *port,
1749                              const struct sk_buff *skb)
1750 {
1751         unsigned int offset = skb_transport_offset(skb);
1752         struct pimhdr *pimhdr, _pimhdr;
1753
1754         pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1755         if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1756             pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1757                 return;
1758
1759         br_multicast_mark_router(br, port);
1760 }
1761
1762 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1763                                  struct net_bridge_port *port,
1764                                  struct sk_buff *skb,
1765                                  u16 vid)
1766 {
1767         struct sk_buff *skb_trimmed = NULL;
1768         const unsigned char *src;
1769         struct igmphdr *ih;
1770         int err;
1771
1772         err = ip_mc_check_igmp(skb, &skb_trimmed);
1773
1774         if (err == -ENOMSG) {
1775                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1776                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1777                 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1778                         if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1779                                 br_multicast_pim(br, port, skb);
1780                 }
1781                 return 0;
1782         } else if (err < 0) {
1783                 br_multicast_err_count(br, port, skb->protocol);
1784                 return err;
1785         }
1786
1787         ih = igmp_hdr(skb);
1788         src = eth_hdr(skb)->h_source;
1789         BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1790
1791         switch (ih->type) {
1792         case IGMP_HOST_MEMBERSHIP_REPORT:
1793         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1794                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1795                 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1796                 break;
1797         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1798                 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1799                 break;
1800         case IGMP_HOST_MEMBERSHIP_QUERY:
1801                 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1802                 break;
1803         case IGMP_HOST_LEAVE_MESSAGE:
1804                 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1805                 break;
1806         }
1807
1808         if (skb_trimmed && skb_trimmed != skb)
1809                 kfree_skb(skb_trimmed);
1810
1811         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1812                            BR_MCAST_DIR_RX);
1813
1814         return err;
1815 }
1816
1817 #if IS_ENABLED(CONFIG_IPV6)
1818 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1819                                  struct net_bridge_port *port,
1820                                  struct sk_buff *skb,
1821                                  u16 vid)
1822 {
1823         struct sk_buff *skb_trimmed = NULL;
1824         const unsigned char *src;
1825         struct mld_msg *mld;
1826         int err;
1827
1828         err = ipv6_mc_check_mld(skb, &skb_trimmed);
1829
1830         if (err == -ENOMSG) {
1831                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1832                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1833                 return 0;
1834         } else if (err < 0) {
1835                 br_multicast_err_count(br, port, skb->protocol);
1836                 return err;
1837         }
1838
1839         mld = (struct mld_msg *)skb_transport_header(skb);
1840         BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1841
1842         switch (mld->mld_type) {
1843         case ICMPV6_MGM_REPORT:
1844                 src = eth_hdr(skb)->h_source;
1845                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1846                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1847                                                  src);
1848                 break;
1849         case ICMPV6_MLD2_REPORT:
1850                 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1851                 break;
1852         case ICMPV6_MGM_QUERY:
1853                 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1854                 break;
1855         case ICMPV6_MGM_REDUCTION:
1856                 src = eth_hdr(skb)->h_source;
1857                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1858                 break;
1859         }
1860
1861         if (skb_trimmed && skb_trimmed != skb)
1862                 kfree_skb(skb_trimmed);
1863
1864         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1865                            BR_MCAST_DIR_RX);
1866
1867         return err;
1868 }
1869 #endif
1870
1871 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1872                      struct sk_buff *skb, u16 vid)
1873 {
1874         int ret = 0;
1875
1876         BR_INPUT_SKB_CB(skb)->igmp = 0;
1877         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1878
1879         if (br->multicast_disabled)
1880                 return 0;
1881
1882         switch (skb->protocol) {
1883         case htons(ETH_P_IP):
1884                 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1885                 break;
1886 #if IS_ENABLED(CONFIG_IPV6)
1887         case htons(ETH_P_IPV6):
1888                 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1889                 break;
1890 #endif
1891         }
1892
1893         return ret;
1894 }
1895
1896 static void br_multicast_query_expired(struct net_bridge *br,
1897                                        struct bridge_mcast_own_query *query,
1898                                        struct bridge_mcast_querier *querier)
1899 {
1900         spin_lock(&br->multicast_lock);
1901         if (query->startup_sent < br->multicast_startup_query_count)
1902                 query->startup_sent++;
1903
1904         RCU_INIT_POINTER(querier->port, NULL);
1905         br_multicast_send_query(br, NULL, query);
1906         spin_unlock(&br->multicast_lock);
1907 }
1908
1909 static void br_ip4_multicast_query_expired(unsigned long data)
1910 {
1911         struct net_bridge *br = (void *)data;
1912
1913         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1914 }
1915
1916 #if IS_ENABLED(CONFIG_IPV6)
1917 static void br_ip6_multicast_query_expired(unsigned long data)
1918 {
1919         struct net_bridge *br = (void *)data;
1920
1921         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1922 }
1923 #endif
1924
1925 void br_multicast_init(struct net_bridge *br)
1926 {
1927         br->hash_elasticity = 4;
1928         br->hash_max = 512;
1929
1930         br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1931         br->multicast_querier = 0;
1932         br->multicast_query_use_ifaddr = 0;
1933         br->multicast_last_member_count = 2;
1934         br->multicast_startup_query_count = 2;
1935
1936         br->multicast_last_member_interval = HZ;
1937         br->multicast_query_response_interval = 10 * HZ;
1938         br->multicast_startup_query_interval = 125 * HZ / 4;
1939         br->multicast_query_interval = 125 * HZ;
1940         br->multicast_querier_interval = 255 * HZ;
1941         br->multicast_membership_interval = 260 * HZ;
1942
1943         br->ip4_other_query.delay_time = 0;
1944         br->ip4_querier.port = NULL;
1945         br->multicast_igmp_version = 2;
1946 #if IS_ENABLED(CONFIG_IPV6)
1947         br->multicast_mld_version = 1;
1948         br->ip6_other_query.delay_time = 0;
1949         br->ip6_querier.port = NULL;
1950 #endif
1951         br->has_ipv6_addr = 1;
1952
1953         spin_lock_init(&br->multicast_lock);
1954         setup_timer(&br->multicast_router_timer,
1955                     br_multicast_local_router_expired, 0);
1956         setup_timer(&br->ip4_other_query.timer,
1957                     br_ip4_multicast_querier_expired, (unsigned long)br);
1958         setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1959                     (unsigned long)br);
1960 #if IS_ENABLED(CONFIG_IPV6)
1961         setup_timer(&br->ip6_other_query.timer,
1962                     br_ip6_multicast_querier_expired, (unsigned long)br);
1963         setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1964                     (unsigned long)br);
1965 #endif
1966 }
1967
1968 static void __br_multicast_open(struct net_bridge *br,
1969                                 struct bridge_mcast_own_query *query)
1970 {
1971         query->startup_sent = 0;
1972
1973         if (br->multicast_disabled)
1974                 return;
1975
1976         mod_timer(&query->timer, jiffies);
1977 }
1978
1979 void br_multicast_open(struct net_bridge *br)
1980 {
1981         __br_multicast_open(br, &br->ip4_own_query);
1982 #if IS_ENABLED(CONFIG_IPV6)
1983         __br_multicast_open(br, &br->ip6_own_query);
1984 #endif
1985 }
1986
1987 void br_multicast_stop(struct net_bridge *br)
1988 {
1989         del_timer_sync(&br->multicast_router_timer);
1990         del_timer_sync(&br->ip4_other_query.timer);
1991         del_timer_sync(&br->ip4_own_query.timer);
1992 #if IS_ENABLED(CONFIG_IPV6)
1993         del_timer_sync(&br->ip6_other_query.timer);
1994         del_timer_sync(&br->ip6_own_query.timer);
1995 #endif
1996 }
1997
1998 void br_multicast_dev_del(struct net_bridge *br)
1999 {
2000         struct net_bridge_mdb_htable *mdb;
2001         struct net_bridge_mdb_entry *mp;
2002         struct hlist_node *n;
2003         u32 ver;
2004         int i;
2005
2006         spin_lock_bh(&br->multicast_lock);
2007         mdb = mlock_dereference(br->mdb, br);
2008         if (!mdb)
2009                 goto out;
2010
2011         br->mdb = NULL;
2012
2013         ver = mdb->ver;
2014         for (i = 0; i < mdb->max; i++) {
2015                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
2016                                           hlist[ver]) {
2017                         del_timer(&mp->timer);
2018                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
2019                 }
2020         }
2021
2022         if (mdb->old) {
2023                 spin_unlock_bh(&br->multicast_lock);
2024                 rcu_barrier_bh();
2025                 spin_lock_bh(&br->multicast_lock);
2026                 WARN_ON(mdb->old);
2027         }
2028
2029         mdb->old = mdb;
2030         call_rcu_bh(&mdb->rcu, br_mdb_free);
2031
2032 out:
2033         spin_unlock_bh(&br->multicast_lock);
2034
2035         free_percpu(br->mcast_stats);
2036 }
2037
2038 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
2039 {
2040         int err = -EINVAL;
2041
2042         spin_lock_bh(&br->multicast_lock);
2043
2044         switch (val) {
2045         case MDB_RTR_TYPE_DISABLED:
2046         case MDB_RTR_TYPE_PERM:
2047                 del_timer(&br->multicast_router_timer);
2048                 /* fall through */
2049         case MDB_RTR_TYPE_TEMP_QUERY:
2050                 br->multicast_router = val;
2051                 err = 0;
2052                 break;
2053         }
2054
2055         spin_unlock_bh(&br->multicast_lock);
2056
2057         return err;
2058 }
2059
2060 static void __del_port_router(struct net_bridge_port *p)
2061 {
2062         if (hlist_unhashed(&p->rlist))
2063                 return;
2064         hlist_del_init_rcu(&p->rlist);
2065         br_rtr_notify(p->br->dev, p, RTM_DELMDB);
2066         br_port_mc_router_state_change(p, false);
2067
2068         /* don't allow timer refresh */
2069         if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2070                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2071 }
2072
2073 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
2074 {
2075         struct net_bridge *br = p->br;
2076         unsigned long now = jiffies;
2077         int err = -EINVAL;
2078
2079         spin_lock(&br->multicast_lock);
2080         if (p->multicast_router == val) {
2081                 /* Refresh the temp router port timer */
2082                 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2083                         mod_timer(&p->multicast_router_timer,
2084                                   now + br->multicast_querier_interval);
2085                 err = 0;
2086                 goto unlock;
2087         }
2088         switch (val) {
2089         case MDB_RTR_TYPE_DISABLED:
2090                 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2091                 __del_port_router(p);
2092                 del_timer(&p->multicast_router_timer);
2093                 break;
2094         case MDB_RTR_TYPE_TEMP_QUERY:
2095                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2096                 __del_port_router(p);
2097                 break;
2098         case MDB_RTR_TYPE_PERM:
2099                 p->multicast_router = MDB_RTR_TYPE_PERM;
2100                 del_timer(&p->multicast_router_timer);
2101                 br_multicast_add_router(br, p);
2102                 break;
2103         case MDB_RTR_TYPE_TEMP:
2104                 p->multicast_router = MDB_RTR_TYPE_TEMP;
2105                 br_multicast_mark_router(br, p);
2106                 break;
2107         default:
2108                 goto unlock;
2109         }
2110         err = 0;
2111 unlock:
2112         spin_unlock(&br->multicast_lock);
2113
2114         return err;
2115 }
2116
2117 static void br_multicast_start_querier(struct net_bridge *br,
2118                                        struct bridge_mcast_own_query *query)
2119 {
2120         struct net_bridge_port *port;
2121
2122         __br_multicast_open(br, query);
2123
2124         list_for_each_entry(port, &br->port_list, list) {
2125                 if (port->state == BR_STATE_DISABLED ||
2126                     port->state == BR_STATE_BLOCKING)
2127                         continue;
2128
2129                 if (query == &br->ip4_own_query)
2130                         br_multicast_enable(&port->ip4_own_query);
2131 #if IS_ENABLED(CONFIG_IPV6)
2132                 else
2133                         br_multicast_enable(&port->ip6_own_query);
2134 #endif
2135         }
2136 }
2137
2138 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2139 {
2140         struct net_bridge_mdb_htable *mdb;
2141         struct net_bridge_port *port;
2142         int err = 0;
2143
2144         spin_lock_bh(&br->multicast_lock);
2145         if (br->multicast_disabled == !val)
2146                 goto unlock;
2147
2148         br_mc_disabled_update(br->dev, !val);
2149         br->multicast_disabled = !val;
2150         if (br->multicast_disabled)
2151                 goto unlock;
2152
2153         if (!netif_running(br->dev))
2154                 goto unlock;
2155
2156         mdb = mlock_dereference(br->mdb, br);
2157         if (mdb) {
2158                 if (mdb->old) {
2159                         err = -EEXIST;
2160 rollback:
2161                         br->multicast_disabled = !!val;
2162                         goto unlock;
2163                 }
2164
2165                 err = br_mdb_rehash(&br->mdb, mdb->max,
2166                                     br->hash_elasticity);
2167                 if (err)
2168                         goto rollback;
2169         }
2170
2171         br_multicast_open(br);
2172         list_for_each_entry(port, &br->port_list, list)
2173                 __br_multicast_enable_port(port);
2174
2175 unlock:
2176         spin_unlock_bh(&br->multicast_lock);
2177
2178         return err;
2179 }
2180
2181 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2182 {
2183         unsigned long max_delay;
2184
2185         val = !!val;
2186
2187         spin_lock_bh(&br->multicast_lock);
2188         if (br->multicast_querier == val)
2189                 goto unlock;
2190
2191         br->multicast_querier = val;
2192         if (!val)
2193                 goto unlock;
2194
2195         max_delay = br->multicast_query_response_interval;
2196
2197         if (!timer_pending(&br->ip4_other_query.timer))
2198                 br->ip4_other_query.delay_time = jiffies + max_delay;
2199
2200         br_multicast_start_querier(br, &br->ip4_own_query);
2201
2202 #if IS_ENABLED(CONFIG_IPV6)
2203         if (!timer_pending(&br->ip6_other_query.timer))
2204                 br->ip6_other_query.delay_time = jiffies + max_delay;
2205
2206         br_multicast_start_querier(br, &br->ip6_own_query);
2207 #endif
2208
2209 unlock:
2210         spin_unlock_bh(&br->multicast_lock);
2211
2212         return 0;
2213 }
2214
2215 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2216 {
2217         int err = -EINVAL;
2218         u32 old;
2219         struct net_bridge_mdb_htable *mdb;
2220
2221         spin_lock_bh(&br->multicast_lock);
2222         if (!is_power_of_2(val))
2223                 goto unlock;
2224
2225         mdb = mlock_dereference(br->mdb, br);
2226         if (mdb && val < mdb->size)
2227                 goto unlock;
2228
2229         err = 0;
2230
2231         old = br->hash_max;
2232         br->hash_max = val;
2233
2234         if (mdb) {
2235                 if (mdb->old) {
2236                         err = -EEXIST;
2237 rollback:
2238                         br->hash_max = old;
2239                         goto unlock;
2240                 }
2241
2242                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2243                                     br->hash_elasticity);
2244                 if (err)
2245                         goto rollback;
2246         }
2247
2248 unlock:
2249         spin_unlock_bh(&br->multicast_lock);
2250
2251         return err;
2252 }
2253
2254 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2255 {
2256         /* Currently we support only version 2 and 3 */
2257         switch (val) {
2258         case 2:
2259         case 3:
2260                 break;
2261         default:
2262                 return -EINVAL;
2263         }
2264
2265         spin_lock_bh(&br->multicast_lock);
2266         br->multicast_igmp_version = val;
2267         spin_unlock_bh(&br->multicast_lock);
2268
2269         return 0;
2270 }
2271
2272 #if IS_ENABLED(CONFIG_IPV6)
2273 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2274 {
2275         /* Currently we support version 1 and 2 */
2276         switch (val) {
2277         case 1:
2278         case 2:
2279                 break;
2280         default:
2281                 return -EINVAL;
2282         }
2283
2284         spin_lock_bh(&br->multicast_lock);
2285         br->multicast_mld_version = val;
2286         spin_unlock_bh(&br->multicast_lock);
2287
2288         return 0;
2289 }
2290 #endif
2291
2292 /**
2293  * br_multicast_list_adjacent - Returns snooped multicast addresses
2294  * @dev:        The bridge port adjacent to which to retrieve addresses
2295  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2296  *
2297  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2298  * snooping feature on all bridge ports of dev's bridge device, excluding
2299  * the addresses from dev itself.
2300  *
2301  * Returns the number of items added to br_ip_list.
2302  *
2303  * Notes:
2304  * - br_ip_list needs to be initialized by caller
2305  * - br_ip_list might contain duplicates in the end
2306  *   (needs to be taken care of by caller)
2307  * - br_ip_list needs to be freed by caller
2308  */
2309 int br_multicast_list_adjacent(struct net_device *dev,
2310                                struct list_head *br_ip_list)
2311 {
2312         struct net_bridge *br;
2313         struct net_bridge_port *port;
2314         struct net_bridge_port_group *group;
2315         struct br_ip_list *entry;
2316         int count = 0;
2317
2318         rcu_read_lock();
2319         if (!br_ip_list || !br_port_exists(dev))
2320                 goto unlock;
2321
2322         port = br_port_get_rcu(dev);
2323         if (!port || !port->br)
2324                 goto unlock;
2325
2326         br = port->br;
2327
2328         list_for_each_entry_rcu(port, &br->port_list, list) {
2329                 if (!port->dev || port->dev == dev)
2330                         continue;
2331
2332                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2333                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2334                         if (!entry)
2335                                 goto unlock;
2336
2337                         entry->addr = group->addr;
2338                         list_add(&entry->list, br_ip_list);
2339                         count++;
2340                 }
2341         }
2342
2343 unlock:
2344         rcu_read_unlock();
2345         return count;
2346 }
2347 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2348
2349 /**
2350  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2351  * @dev: The bridge port providing the bridge on which to check for a querier
2352  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2353  *
2354  * Checks whether the given interface has a bridge on top and if so returns
2355  * true if a valid querier exists anywhere on the bridged link layer.
2356  * Otherwise returns false.
2357  */
2358 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2359 {
2360         struct net_bridge *br;
2361         struct net_bridge_port *port;
2362         struct ethhdr eth;
2363         bool ret = false;
2364
2365         rcu_read_lock();
2366         if (!br_port_exists(dev))
2367                 goto unlock;
2368
2369         port = br_port_get_rcu(dev);
2370         if (!port || !port->br)
2371                 goto unlock;
2372
2373         br = port->br;
2374
2375         memset(&eth, 0, sizeof(eth));
2376         eth.h_proto = htons(proto);
2377
2378         ret = br_multicast_querier_exists(br, &eth);
2379
2380 unlock:
2381         rcu_read_unlock();
2382         return ret;
2383 }
2384 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2385
2386 /**
2387  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2388  * @dev: The bridge port adjacent to which to check for a querier
2389  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2390  *
2391  * Checks whether the given interface has a bridge on top and if so returns
2392  * true if a selected querier is behind one of the other ports of this
2393  * bridge. Otherwise returns false.
2394  */
2395 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2396 {
2397         struct net_bridge *br;
2398         struct net_bridge_port *port;
2399         bool ret = false;
2400
2401         rcu_read_lock();
2402         if (!br_port_exists(dev))
2403                 goto unlock;
2404
2405         port = br_port_get_rcu(dev);
2406         if (!port || !port->br)
2407                 goto unlock;
2408
2409         br = port->br;
2410
2411         switch (proto) {
2412         case ETH_P_IP:
2413                 if (!timer_pending(&br->ip4_other_query.timer) ||
2414                     rcu_dereference(br->ip4_querier.port) == port)
2415                         goto unlock;
2416                 break;
2417 #if IS_ENABLED(CONFIG_IPV6)
2418         case ETH_P_IPV6:
2419                 if (!timer_pending(&br->ip6_other_query.timer) ||
2420                     rcu_dereference(br->ip6_querier.port) == port)
2421                         goto unlock;
2422                 break;
2423 #endif
2424         default:
2425                 goto unlock;
2426         }
2427
2428         ret = true;
2429 unlock:
2430         rcu_read_unlock();
2431         return ret;
2432 }
2433 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2434
2435 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2436                                const struct sk_buff *skb, u8 type, u8 dir)
2437 {
2438         struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2439         __be16 proto = skb->protocol;
2440         unsigned int t_len;
2441
2442         u64_stats_update_begin(&pstats->syncp);
2443         switch (proto) {
2444         case htons(ETH_P_IP):
2445                 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2446                 switch (type) {
2447                 case IGMP_HOST_MEMBERSHIP_REPORT:
2448                         pstats->mstats.igmp_v1reports[dir]++;
2449                         break;
2450                 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2451                         pstats->mstats.igmp_v2reports[dir]++;
2452                         break;
2453                 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2454                         pstats->mstats.igmp_v3reports[dir]++;
2455                         break;
2456                 case IGMP_HOST_MEMBERSHIP_QUERY:
2457                         if (t_len != sizeof(struct igmphdr)) {
2458                                 pstats->mstats.igmp_v3queries[dir]++;
2459                         } else {
2460                                 unsigned int offset = skb_transport_offset(skb);
2461                                 struct igmphdr *ih, _ihdr;
2462
2463                                 ih = skb_header_pointer(skb, offset,
2464                                                         sizeof(_ihdr), &_ihdr);
2465                                 if (!ih)
2466                                         break;
2467                                 if (!ih->code)
2468                                         pstats->mstats.igmp_v1queries[dir]++;
2469                                 else
2470                                         pstats->mstats.igmp_v2queries[dir]++;
2471                         }
2472                         break;
2473                 case IGMP_HOST_LEAVE_MESSAGE:
2474                         pstats->mstats.igmp_leaves[dir]++;
2475                         break;
2476                 }
2477                 break;
2478 #if IS_ENABLED(CONFIG_IPV6)
2479         case htons(ETH_P_IPV6):
2480                 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2481                         sizeof(struct ipv6hdr);
2482                 t_len -= skb_network_header_len(skb);
2483                 switch (type) {
2484                 case ICMPV6_MGM_REPORT:
2485                         pstats->mstats.mld_v1reports[dir]++;
2486                         break;
2487                 case ICMPV6_MLD2_REPORT:
2488                         pstats->mstats.mld_v2reports[dir]++;
2489                         break;
2490                 case ICMPV6_MGM_QUERY:
2491                         if (t_len != sizeof(struct mld_msg))
2492                                 pstats->mstats.mld_v2queries[dir]++;
2493                         else
2494                                 pstats->mstats.mld_v1queries[dir]++;
2495                         break;
2496                 case ICMPV6_MGM_REDUCTION:
2497                         pstats->mstats.mld_leaves[dir]++;
2498                         break;
2499                 }
2500                 break;
2501 #endif /* CONFIG_IPV6 */
2502         }
2503         u64_stats_update_end(&pstats->syncp);
2504 }
2505
2506 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2507                         const struct sk_buff *skb, u8 type, u8 dir)
2508 {
2509         struct bridge_mcast_stats __percpu *stats;
2510
2511         /* if multicast_disabled is true then igmp type can't be set */
2512         if (!type || !br->multicast_stats_enabled)
2513                 return;
2514
2515         if (p)
2516                 stats = p->mcast_stats;
2517         else
2518                 stats = br->mcast_stats;
2519         if (WARN_ON(!stats))
2520                 return;
2521
2522         br_mcast_stats_add(stats, skb, type, dir);
2523 }
2524
2525 int br_multicast_init_stats(struct net_bridge *br)
2526 {
2527         br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2528         if (!br->mcast_stats)
2529                 return -ENOMEM;
2530
2531         return 0;
2532 }
2533
2534 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2535 {
2536         dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2537         dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2538 }
2539
2540 void br_multicast_get_stats(const struct net_bridge *br,
2541                             const struct net_bridge_port *p,
2542                             struct br_mcast_stats *dest)
2543 {
2544         struct bridge_mcast_stats __percpu *stats;
2545         struct br_mcast_stats tdst;
2546         int i;
2547
2548         memset(dest, 0, sizeof(*dest));
2549         if (p)
2550                 stats = p->mcast_stats;
2551         else
2552                 stats = br->mcast_stats;
2553         if (WARN_ON(!stats))
2554                 return;
2555
2556         memset(&tdst, 0, sizeof(tdst));
2557         for_each_possible_cpu(i) {
2558                 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2559                 struct br_mcast_stats temp;
2560                 unsigned int start;
2561
2562                 do {
2563                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2564                         memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2565                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2566
2567                 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2568                 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2569                 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2570                 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2571                 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2572                 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2573                 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2574                 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2575
2576                 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2577                 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2578                 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2579                 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2580                 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2581                 tdst.mld_parse_errors += temp.mld_parse_errors;
2582         }
2583         memcpy(dest, &tdst, sizeof(*dest));
2584 }