net/bridge/br_multicast.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Bridge multicast support.
   4  *
   5  * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
   6  */
   7
   8 #include <linux/err.h>
   9 #include <linux/export.h>
  10 #include <linux/if_ether.h>
  11 #include <linux/igmp.h>
  12 #include <linux/in.h>
  13 #include <linux/jhash.h>
  14 #include <linux/kernel.h>
  15 #include <linux/log2.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/netfilter_bridge.h>
  18 #include <linux/random.h>
  19 #include <linux/rculist.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/slab.h>
  22 #include <linux/timer.h>
  23 #include <linux/inetdevice.h>
  24 #include <linux/mroute.h>
  25 #include <net/ip.h>
  26 #include <net/switchdev.h>
  27 #if IS_ENABLED(CONFIG_IPV6)
  28 #include <linux/icmpv6.h>
  29 #include <net/ipv6.h>
  30 #include <net/mld.h>
  31 #include <net/ip6_checksum.h>
  32 #include <net/addrconf.h>
  33 #endif
  34
  35 #include "br_private.h"
  36
  37 static const struct rhashtable_params br_mdb_rht_params = {
  38         .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode),
  39         .key_offset = offsetof(struct net_bridge_mdb_entry, addr),
  40         .key_len = sizeof(struct br_ip),
  41         .automatic_shrinking = true,
  42 };
  43
  44 static void br_multicast_start_querier(struct net_bridge *br,
  45                                        struct bridge_mcast_own_query *query);
  46 static void br_multicast_add_router(struct net_bridge *br,
  47                                     struct net_bridge_port *port);
  48 static void br_ip4_multicast_leave_group(struct net_bridge *br,
  49                                          struct net_bridge_port *port,
  50                                          __be32 group,
  51                                          __u16 vid,
  52                                          const unsigned char *src);
  53
  54 static void __del_port_router(struct net_bridge_port *p);
  55 #if IS_ENABLED(CONFIG_IPV6)
  56 static void br_ip6_multicast_leave_group(struct net_bridge *br,
  57                                          struct net_bridge_port *port,
  58                                          const struct in6_addr *group,
  59                                          __u16 vid, const unsigned char *src);
  60 #endif
  61
  62 static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
  63                                                       struct br_ip *dst)
  64 {
  65         return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
  66 }
  67
  68 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
  69                                            struct br_ip *dst)
  70 {
  71         struct net_bridge_mdb_entry *ent;
  72
  73         lockdep_assert_held_once(&br->multicast_lock);
  74
  75         rcu_read_lock();
  76         ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
  77         rcu_read_unlock();
  78
  79         return ent;
  80 }
  81
  82 static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
  83                                                    __be32 dst, __u16 vid)
  84 {
  85         struct br_ip br_dst;
  86
  87         memset(&br_dst, 0, sizeof(br_dst));
  88         br_dst.u.ip4 = dst;
  89         br_dst.proto = htons(ETH_P_IP);
  90         br_dst.vid = vid;
  91
  92         return br_mdb_ip_get(br, &br_dst);
  93 }
  94
  95 #if IS_ENABLED(CONFIG_IPV6)
  96 static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
  97                                                    const struct in6_addr *dst,
  98                                                    __u16 vid)
  99 {
 100         struct br_ip br_dst;
 101
 102         memset(&br_dst, 0, sizeof(br_dst));
 103         br_dst.u.ip6 = *dst;
 104         br_dst.proto = htons(ETH_P_IPV6);
 105         br_dst.vid = vid;
 106
 107         return br_mdb_ip_get(br, &br_dst);
 108 }
 109 #endif
 110
 111 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 112                                         struct sk_buff *skb, u16 vid)
 113 {
 114         struct br_ip ip;
 115
 116         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
 117                 return NULL;
 118
 119         if (BR_INPUT_SKB_CB(skb)->igmp)
 120                 return NULL;
 121
 122         memset(&ip, 0, sizeof(ip));
 123         ip.proto = skb->protocol;
 124         ip.vid = vid;
 125
 126         switch (skb->protocol) {
 127         case htons(ETH_P_IP):
 128                 ip.u.ip4 = ip_hdr(skb)->daddr;
 129                 break;
 130 #if IS_ENABLED(CONFIG_IPV6)
 131         case htons(ETH_P_IPV6):
 132                 ip.u.ip6 = ipv6_hdr(skb)->daddr;
 133                 break;
 134 #endif
 135         default:
 136                 return NULL;
 137         }
 138
 139         return br_mdb_ip_get_rcu(br, &ip);
 140 }
 141
 142 static void br_multicast_group_expired(struct timer_list *t)
 143 {
 144         struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
 145         struct net_bridge *br = mp->br;
 146
 147         spin_lock(&br->multicast_lock);
 148         if (!netif_running(br->dev) || timer_pending(&mp->timer))
 149                 goto out;
 150
 151         mp->host_joined = false;
 152         br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
 153
 154         if (mp->ports)
 155                 goto out;
 156
 157         rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
 158                                br_mdb_rht_params);
 159         hlist_del_rcu(&mp->mdb_node);
 160
 161         kfree_rcu(mp, rcu);
 162
 163 out:
 164         spin_unlock(&br->multicast_lock);
 165 }
 166
 167 static void br_multicast_del_pg(struct net_bridge *br,
 168                                 struct net_bridge_port_group *pg)
 169 {
 170         struct net_bridge_mdb_entry *mp;
 171         struct net_bridge_port_group *p;
 172         struct net_bridge_port_group __rcu **pp;
 173
 174         mp = br_mdb_ip_get(br, &pg->addr);
 175         if (WARN_ON(!mp))
 176                 return;
 177
 178         for (pp = &mp->ports;
 179              (p = mlock_dereference(*pp, br)) != NULL;
 180              pp = &p->next) {
 181                 if (p != pg)
 182                         continue;
 183
 184                 rcu_assign_pointer(*pp, p->next);
 185                 hlist_del_init(&p->mglist);
 186                 del_timer(&p->timer);
 187                 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
 188                               p->flags);
 189                 kfree_rcu(p, rcu);
 190
 191                 if (!mp->ports && !mp->host_joined &&
 192                     netif_running(br->dev))
 193                         mod_timer(&mp->timer, jiffies);
 194
 195                 return;
 196         }
 197
 198         WARN_ON(1);
 199 }
 200
 201 static void br_multicast_port_group_expired(struct timer_list *t)
 202 {
 203         struct net_bridge_port_group *pg = from_timer(pg, t, timer);
 204         struct net_bridge *br = pg->port->br;
 205
 206         spin_lock(&br->multicast_lock);
 207         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
 208             hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
 209                 goto out;
 210
 211         br_multicast_del_pg(br, pg);
 212
 213 out:
 214         spin_unlock(&br->multicast_lock);
 215 }
 216
 217 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
 218                                                     __be32 group,
 219                                                     u8 *igmp_type)
 220 {
 221         struct igmpv3_query *ihv3;
 222         size_t igmp_hdr_size;
 223         struct sk_buff *skb;
 224         struct igmphdr *ih;
 225         struct ethhdr *eth;
 226         struct iphdr *iph;
 227
 228         igmp_hdr_size = sizeof(*ih);
 229         if (br->multicast_igmp_version == 3)
 230                 igmp_hdr_size = sizeof(*ihv3);
 231         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
 232                                                  igmp_hdr_size + 4);
 233         if (!skb)
 234                 goto out;
 235
 236         skb->protocol = htons(ETH_P_IP);
 237
 238         skb_reset_mac_header(skb);
 239         eth = eth_hdr(skb);
 240
 241         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 242         eth->h_dest[0] = 1;
 243         eth->h_dest[1] = 0;
 244         eth->h_dest[2] = 0x5e;
 245         eth->h_dest[3] = 0;
 246         eth->h_dest[4] = 0;
 247         eth->h_dest[5] = 1;
 248         eth->h_proto = htons(ETH_P_IP);
 249         skb_put(skb, sizeof(*eth));
 250
 251         skb_set_network_header(skb, skb->len);
 252         iph = ip_hdr(skb);
 253
 254         iph->version = 4;
 255         iph->ihl = 6;
 256         iph->tos = 0xc0;
 257         iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
 258         iph->id = 0;
 259         iph->frag_off = htons(IP_DF);
 260         iph->ttl = 1;
 261         iph->protocol = IPPROTO_IGMP;
 262         iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
 263                      inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
 264         iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 265         ((u8 *)&iph[1])[0] = IPOPT_RA;
 266         ((u8 *)&iph[1])[1] = 4;
 267         ((u8 *)&iph[1])[2] = 0;
 268         ((u8 *)&iph[1])[3] = 0;
 269         ip_send_check(iph);
 270         skb_put(skb, 24);
 271
 272         skb_set_transport_header(skb, skb->len);
 273         *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
 274
 275         switch (br->multicast_igmp_version) {
 276         case 2:
 277                 ih = igmp_hdr(skb);
 278                 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
 279                 ih->code = (group ? br->multicast_last_member_interval :
 280                                     br->multicast_query_response_interval) /
 281                            (HZ / IGMP_TIMER_SCALE);
 282                 ih->group = group;
 283                 ih->csum = 0;
 284                 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
 285                 break;
 286         case 3:
 287                 ihv3 = igmpv3_query_hdr(skb);
 288                 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
 289                 ihv3->code = (group ? br->multicast_last_member_interval :
 290                                       br->multicast_query_response_interval) /
 291                              (HZ / IGMP_TIMER_SCALE);
 292                 ihv3->group = group;
 293                 ihv3->qqic = br->multicast_query_interval / HZ;
 294                 ihv3->nsrcs = 0;
 295                 ihv3->resv = 0;
 296                 ihv3->suppress = 0;
 297                 ihv3->qrv = 2;
 298                 ihv3->csum = 0;
 299                 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
 300                 break;
 301         }
 302
 303         skb_put(skb, igmp_hdr_size);
 304         __skb_pull(skb, sizeof(*eth));
 305
 306 out:
 307         return skb;
 308 }
 309
 310 #if IS_ENABLED(CONFIG_IPV6)
 311 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
 312                                                     const struct in6_addr *grp,
 313                                                     u8 *igmp_type)
 314 {
 315         struct mld2_query *mld2q;
 316         unsigned long interval;
 317         struct ipv6hdr *ip6h;
 318         struct mld_msg *mldq;
 319         size_t mld_hdr_size;
 320         struct sk_buff *skb;
 321         struct ethhdr *eth;
 322         u8 *hopopt;
 323
 324         mld_hdr_size = sizeof(*mldq);
 325         if (br->multicast_mld_version == 2)
 326                 mld_hdr_size = sizeof(*mld2q);
 327         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
 328                                                  8 + mld_hdr_size);
 329         if (!skb)
 330                 goto out;
 331
 332         skb->protocol = htons(ETH_P_IPV6);
 333
 334         /* Ethernet header */
 335         skb_reset_mac_header(skb);
 336         eth = eth_hdr(skb);
 337
 338         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 339         eth->h_proto = htons(ETH_P_IPV6);
 340         skb_put(skb, sizeof(*eth));
 341
 342         /* IPv6 header + HbH option */
 343         skb_set_network_header(skb, skb->len);
 344         ip6h = ipv6_hdr(skb);
 345
 346         *(__force __be32 *)ip6h = htonl(0x60000000);
 347         ip6h->payload_len = htons(8 + mld_hdr_size);
 348         ip6h->nexthdr = IPPROTO_HOPOPTS;
 349         ip6h->hop_limit = 1;
 350         ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
 351         if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
 352                                &ip6h->saddr)) {
 353                 kfree_skb(skb);
 354                 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
 355                 return NULL;
 356         }
 357
 358         br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
 359         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 360
 361         hopopt = (u8 *)(ip6h + 1);
 362         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
 363         hopopt[1] = 0;                          /* length of HbH */
 364         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
 365         hopopt[3] = 2;                          /* Length of RA Option */
 366         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
 367         hopopt[5] = 0;
 368         hopopt[6] = IPV6_TLV_PAD1;              /* Pad1 */
 369         hopopt[7] = IPV6_TLV_PAD1;              /* Pad1 */
 370
 371         skb_put(skb, sizeof(*ip6h) + 8);
 372
 373         /* ICMPv6 */
 374         skb_set_transport_header(skb, skb->len);
 375         interval = ipv6_addr_any(grp) ?
 376                         br->multicast_query_response_interval :
 377                         br->multicast_last_member_interval;
 378         *igmp_type = ICMPV6_MGM_QUERY;
 379         switch (br->multicast_mld_version) {
 380         case 1:
 381                 mldq = (struct mld_msg *)icmp6_hdr(skb);
 382                 mldq->mld_type = ICMPV6_MGM_QUERY;
 383                 mldq->mld_code = 0;
 384                 mldq->mld_cksum = 0;
 385                 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
 386                 mldq->mld_reserved = 0;
 387                 mldq->mld_mca = *grp;
 388                 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 389                                                   sizeof(*mldq), IPPROTO_ICMPV6,
 390                                                   csum_partial(mldq,
 391                                                                sizeof(*mldq),
 392                                                                0));
 393                 break;
 394         case 2:
 395                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
 396                 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
 397                 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
 398                 mld2q->mld2q_code = 0;
 399                 mld2q->mld2q_cksum = 0;
 400                 mld2q->mld2q_resv1 = 0;
 401                 mld2q->mld2q_resv2 = 0;
 402                 mld2q->mld2q_suppress = 0;
 403                 mld2q->mld2q_qrv = 2;
 404                 mld2q->mld2q_nsrcs = 0;
 405                 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
 406                 mld2q->mld2q_mca = *grp;
 407                 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 408                                                      sizeof(*mld2q),
 409                                                      IPPROTO_ICMPV6,
 410                                                      csum_partial(mld2q,
 411                                                                   sizeof(*mld2q),
 412                                                                   0));
 413                 break;
 414         }
 415         skb_put(skb, mld_hdr_size);
 416
 417         __skb_pull(skb, sizeof(*eth));
 418
 419 out:
 420         return skb;
 421 }
 422 #endif
 423
 424 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 425                                                 struct br_ip *addr,
 426                                                 u8 *igmp_type)
 427 {
 428         switch (addr->proto) {
 429         case htons(ETH_P_IP):
 430                 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
 431 #if IS_ENABLED(CONFIG_IPV6)
 432         case htons(ETH_P_IPV6):
 433                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
 434                                                     igmp_type);
 435 #endif
 436         }
 437         return NULL;
 438 }
 439
 440 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 441                                                     struct br_ip *group)
 442 {
 443         struct net_bridge_mdb_entry *mp;
 444         int err;
 445
 446         mp = br_mdb_ip_get(br, group);
 447         if (mp)
 448                 return mp;
 449
 450         if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
 451                 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
 452                 return ERR_PTR(-E2BIG);
 453         }
 454
 455         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 456         if (unlikely(!mp))
 457                 return ERR_PTR(-ENOMEM);
 458
 459         mp->br = br;
 460         mp->addr = *group;
 461         timer_setup(&mp->timer, br_multicast_group_expired, 0);
 462         err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
 463                                             br_mdb_rht_params);
 464         if (err) {
 465                 kfree(mp);
 466                 mp = ERR_PTR(err);
 467         } else {
 468                 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
 469         }
 470
 471         return mp;
 472 }
 473
 474 struct net_bridge_port_group *br_multicast_new_port_group(
 475                         struct net_bridge_port *port,
 476                         struct br_ip *group,
 477                         struct net_bridge_port_group __rcu *next,
 478                         unsigned char flags,
 479                         const unsigned char *src)
 480 {
 481         struct net_bridge_port_group *p;
 482
 483         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 484         if (unlikely(!p))
 485                 return NULL;
 486
 487         p->addr = *group;
 488         p->port = port;
 489         p->flags = flags;
 490         rcu_assign_pointer(p->next, next);
 491         hlist_add_head(&p->mglist, &port->mglist);
 492         timer_setup(&p->timer, br_multicast_port_group_expired, 0);
 493
 494         if (src)
 495                 memcpy(p->eth_addr, src, ETH_ALEN);
 496         else
 497                 eth_broadcast_addr(p->eth_addr);
 498
 499         return p;
 500 }
 501
 502 static bool br_port_group_equal(struct net_bridge_port_group *p,
 503                                 struct net_bridge_port *port,
 504                                 const unsigned char *src)
 505 {
 506         if (p->port != port)
 507                 return false;
 508
 509         if (!(port->flags & BR_MULTICAST_TO_UNICAST))
 510                 return true;
 511
 512         return ether_addr_equal(src, p->eth_addr);
 513 }
 514
 515 static int br_multicast_add_group(struct net_bridge *br,
 516                                   struct net_bridge_port *port,
 517                                   struct br_ip *group,
 518                                   const unsigned char *src)
 519 {
 520         struct net_bridge_port_group __rcu **pp;
 521         struct net_bridge_port_group *p;
 522         struct net_bridge_mdb_entry *mp;
 523         unsigned long now = jiffies;
 524         int err;
 525
 526         spin_lock(&br->multicast_lock);
 527         if (!netif_running(br->dev) ||
 528             (port && port->state == BR_STATE_DISABLED))
 529                 goto out;
 530
 531         mp = br_multicast_new_group(br, group);
 532         err = PTR_ERR(mp);
 533         if (IS_ERR(mp))
 534                 goto err;
 535
 536         if (!port) {
 537                 if (!mp->host_joined) {
 538                         mp->host_joined = true;
 539                         br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0);
 540                 }
 541                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
 542                 goto out;
 543         }
 544
 545         for (pp = &mp->ports;
 546              (p = mlock_dereference(*pp, br)) != NULL;
 547              pp = &p->next) {
 548                 if (br_port_group_equal(p, port, src))
 549                         goto found;
 550                 if ((unsigned long)p->port < (unsigned long)port)
 551                         break;
 552         }
 553
 554         p = br_multicast_new_port_group(port, group, *pp, 0, src);
 555         if (unlikely(!p))
 556                 goto err;
 557         rcu_assign_pointer(*pp, p);
 558         br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
 559
 560 found:
 561         mod_timer(&p->timer, now + br->multicast_membership_interval);
 562 out:
 563         err = 0;
 564
 565 err:
 566         spin_unlock(&br->multicast_lock);
 567         return err;
 568 }
 569
 570 static int br_ip4_multicast_add_group(struct net_bridge *br,
 571                                       struct net_bridge_port *port,
 572                                       __be32 group,
 573                                       __u16 vid,
 574                                       const unsigned char *src)
 575 {
 576         struct br_ip br_group;
 577
 578         if (ipv4_is_local_multicast(group))
 579                 return 0;
 580
 581         memset(&br_group, 0, sizeof(br_group));
 582         br_group.u.ip4 = group;
 583         br_group.proto = htons(ETH_P_IP);
 584         br_group.vid = vid;
 585
 586         return br_multicast_add_group(br, port, &br_group, src);
 587 }
 588
 589 #if IS_ENABLED(CONFIG_IPV6)
 590 static int br_ip6_multicast_add_group(struct net_bridge *br,
 591                                       struct net_bridge_port *port,
 592                                       const struct in6_addr *group,
 593                                       __u16 vid,
 594                                       const unsigned char *src)
 595 {
 596         struct br_ip br_group;
 597
 598         if (ipv6_addr_is_ll_all_nodes(group))
 599                 return 0;
 600
 601         memset(&br_group, 0, sizeof(br_group));
 602         br_group.u.ip6 = *group;
 603         br_group.proto = htons(ETH_P_IPV6);
 604         br_group.vid = vid;
 605
 606         return br_multicast_add_group(br, port, &br_group, src);
 607 }
 608 #endif
 609
 610 static void br_multicast_router_expired(struct timer_list *t)
 611 {
 612         struct net_bridge_port *port =
 613                         from_timer(port, t, multicast_router_timer);
 614         struct net_bridge *br = port->br;
 615
 616         spin_lock(&br->multicast_lock);
 617         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
 618             port->multicast_router == MDB_RTR_TYPE_PERM ||
 619             timer_pending(&port->multicast_router_timer))
 620                 goto out;
 621
 622         __del_port_router(port);
 623 out:
 624         spin_unlock(&br->multicast_lock);
 625 }
 626
 627 static void br_mc_router_state_change(struct net_bridge *p,
 628                                       bool is_mc_router)
 629 {
 630         struct switchdev_attr attr = {
 631                 .orig_dev = p->dev,
 632                 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
 633                 .flags = SWITCHDEV_F_DEFER,
 634                 .u.mrouter = is_mc_router,
 635         };
 636
 637         switchdev_port_attr_set(p->dev, &attr);
 638 }
 639
 640 static void br_multicast_local_router_expired(struct timer_list *t)
 641 {
 642         struct net_bridge *br = from_timer(br, t, multicast_router_timer);
 643
 644         spin_lock(&br->multicast_lock);
 645         if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
 646             br->multicast_router == MDB_RTR_TYPE_PERM ||
 647             timer_pending(&br->multicast_router_timer))
 648                 goto out;
 649
 650         br_mc_router_state_change(br, false);
 651 out:
 652         spin_unlock(&br->multicast_lock);
 653 }
 654
 655 static void br_multicast_querier_expired(struct net_bridge *br,
 656                                          struct bridge_mcast_own_query *query)
 657 {
 658         spin_lock(&br->multicast_lock);
 659         if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
 660                 goto out;
 661
 662         br_multicast_start_querier(br, query);
 663
 664 out:
 665         spin_unlock(&br->multicast_lock);
 666 }
 667
 668 static void br_ip4_multicast_querier_expired(struct timer_list *t)
 669 {
 670         struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
 671
 672         br_multicast_querier_expired(br, &br->ip4_own_query);
 673 }
 674
 675 #if IS_ENABLED(CONFIG_IPV6)
 676 static void br_ip6_multicast_querier_expired(struct timer_list *t)
 677 {
 678         struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
 679
 680         br_multicast_querier_expired(br, &br->ip6_own_query);
 681 }
 682 #endif
 683
 684 static void br_multicast_select_own_querier(struct net_bridge *br,
 685                                             struct br_ip *ip,
 686                                             struct sk_buff *skb)
 687 {
 688         if (ip->proto == htons(ETH_P_IP))
 689                 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
 690 #if IS_ENABLED(CONFIG_IPV6)
 691         else
 692                 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
 693 #endif
 694 }
 695
 696 static void __br_multicast_send_query(struct net_bridge *br,
 697                                       struct net_bridge_port *port,
 698                                       struct br_ip *ip)
 699 {
 700         struct sk_buff *skb;
 701         u8 igmp_type;
 702
 703         skb = br_multicast_alloc_query(br, ip, &igmp_type);
 704         if (!skb)
 705                 return;
 706
 707         if (port) {
 708                 skb->dev = port->dev;
 709                 br_multicast_count(br, port, skb, igmp_type,
 710                                    BR_MCAST_DIR_TX);
 711                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
 712                         dev_net(port->dev), NULL, skb, NULL, skb->dev,
 713                         br_dev_queue_push_xmit);
 714         } else {
 715                 br_multicast_select_own_querier(br, ip, skb);
 716                 br_multicast_count(br, port, skb, igmp_type,
 717                                    BR_MCAST_DIR_RX);
 718                 netif_rx(skb);
 719         }
 720 }
 721
 722 static void br_multicast_send_query(struct net_bridge *br,
 723                                     struct net_bridge_port *port,
 724                                     struct bridge_mcast_own_query *own_query)
 725 {
 726         struct bridge_mcast_other_query *other_query = NULL;
 727         struct br_ip br_group;
 728         unsigned long time;
 729
 730         if (!netif_running(br->dev) ||
 731             !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
 732             !br_opt_get(br, BROPT_MULTICAST_QUERIER))
 733                 return;
 734
 735         memset(&br_group.u, 0, sizeof(br_group.u));
 736
 737         if (port ? (own_query == &port->ip4_own_query) :
 738                    (own_query == &br->ip4_own_query)) {
 739                 other_query = &br->ip4_other_query;
 740                 br_group.proto = htons(ETH_P_IP);
 741 #if IS_ENABLED(CONFIG_IPV6)
 742         } else {
 743                 other_query = &br->ip6_other_query;
 744                 br_group.proto = htons(ETH_P_IPV6);
 745 #endif
 746         }
 747
 748         if (!other_query || timer_pending(&other_query->timer))
 749                 return;
 750
 751         __br_multicast_send_query(br, port, &br_group);
 752
 753         time = jiffies;
 754         time += own_query->startup_sent < br->multicast_startup_query_count ?
 755                 br->multicast_startup_query_interval :
 756                 br->multicast_query_interval;
 757         mod_timer(&own_query->timer, time);
 758 }
 759
 760 static void
 761 br_multicast_port_query_expired(struct net_bridge_port *port,
 762                                 struct bridge_mcast_own_query *query)
 763 {
 764         struct net_bridge *br = port->br;
 765
 766         spin_lock(&br->multicast_lock);
 767         if (port->state == BR_STATE_DISABLED ||
 768             port->state == BR_STATE_BLOCKING)
 769                 goto out;
 770
 771         if (query->startup_sent < br->multicast_startup_query_count)
 772                 query->startup_sent++;
 773
 774         br_multicast_send_query(port->br, port, query);
 775
 776 out:
 777         spin_unlock(&br->multicast_lock);
 778 }
 779
 780 static void br_ip4_multicast_port_query_expired(struct timer_list *t)
 781 {
 782         struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
 783
 784         br_multicast_port_query_expired(port, &port->ip4_own_query);
 785 }
 786
 787 #if IS_ENABLED(CONFIG_IPV6)
 788 static void br_ip6_multicast_port_query_expired(struct timer_list *t)
 789 {
 790         struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
 791
 792         br_multicast_port_query_expired(port, &port->ip6_own_query);
 793 }
 794 #endif
 795
 796 static void br_mc_disabled_update(struct net_device *dev, bool value)
 797 {
 798         struct switchdev_attr attr = {
 799                 .orig_dev = dev,
 800                 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
 801                 .flags = SWITCHDEV_F_DEFER,
 802                 .u.mc_disabled = !value,
 803         };
 804
 805         switchdev_port_attr_set(dev, &attr);
 806 }
 807
 808 int br_multicast_add_port(struct net_bridge_port *port)
 809 {
 810         port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
 811
 812         timer_setup(&port->multicast_router_timer,
 813                     br_multicast_router_expired, 0);
 814         timer_setup(&port->ip4_own_query.timer,
 815                     br_ip4_multicast_port_query_expired, 0);
 816 #if IS_ENABLED(CONFIG_IPV6)
 817         timer_setup(&port->ip6_own_query.timer,
 818                     br_ip6_multicast_port_query_expired, 0);
 819 #endif
 820         br_mc_disabled_update(port->dev,
 821                               br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
 822
 823         port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
 824         if (!port->mcast_stats)
 825                 return -ENOMEM;
 826
 827         return 0;
 828 }
 829
 830 void br_multicast_del_port(struct net_bridge_port *port)
 831 {
 832         struct net_bridge *br = port->br;
 833         struct net_bridge_port_group *pg;
 834         struct hlist_node *n;
 835
 836         /* Take care of the remaining groups, only perm ones should be left */
 837         spin_lock_bh(&br->multicast_lock);
 838         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 839                 br_multicast_del_pg(br, pg);
 840         spin_unlock_bh(&br->multicast_lock);
 841         del_timer_sync(&port->multicast_router_timer);
 842         free_percpu(port->mcast_stats);
 843 }
 844
 845 static void br_multicast_enable(struct bridge_mcast_own_query *query)
 846 {
 847         query->startup_sent = 0;
 848
 849         if (try_to_del_timer_sync(&query->timer) >= 0 ||
 850             del_timer(&query->timer))
 851                 mod_timer(&query->timer, jiffies);
 852 }
 853
 854 static void __br_multicast_enable_port(struct net_bridge_port *port)
 855 {
 856         struct net_bridge *br = port->br;
 857
 858         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
 859                 return;
 860
 861         br_multicast_enable(&port->ip4_own_query);
 862 #if IS_ENABLED(CONFIG_IPV6)
 863         br_multicast_enable(&port->ip6_own_query);
 864 #endif
 865         if (port->multicast_router == MDB_RTR_TYPE_PERM &&
 866             hlist_unhashed(&port->rlist))
 867                 br_multicast_add_router(br, port);
 868 }
 869
 870 void br_multicast_enable_port(struct net_bridge_port *port)
 871 {
 872         struct net_bridge *br = port->br;
 873
 874         spin_lock(&br->multicast_lock);
 875         __br_multicast_enable_port(port);
 876         spin_unlock(&br->multicast_lock);
 877 }
 878
 879 void br_multicast_disable_port(struct net_bridge_port *port)
 880 {
 881         struct net_bridge *br = port->br;
 882         struct net_bridge_port_group *pg;
 883         struct hlist_node *n;
 884
 885         spin_lock(&br->multicast_lock);
 886         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 887                 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
 888                         br_multicast_del_pg(br, pg);
 889
 890         __del_port_router(port);
 891
 892         del_timer(&port->multicast_router_timer);
 893         del_timer(&port->ip4_own_query.timer);
 894 #if IS_ENABLED(CONFIG_IPV6)
 895         del_timer(&port->ip6_own_query.timer);
 896 #endif
 897         spin_unlock(&br->multicast_lock);
 898 }
 899
 900 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
 901                                          struct net_bridge_port *port,
 902                                          struct sk_buff *skb,
 903                                          u16 vid)
 904 {
 905         const unsigned char *src;
 906         struct igmpv3_report *ih;
 907         struct igmpv3_grec *grec;
 908         int i;
 909         int len;
 910         int num;
 911         int type;
 912         int err = 0;
 913         __be32 group;
 914
 915         ih = igmpv3_report_hdr(skb);
 916         num = ntohs(ih->ngrec);
 917         len = skb_transport_offset(skb) + sizeof(*ih);
 918
 919         for (i = 0; i < num; i++) {
 920                 len += sizeof(*grec);
 921                 if (!ip_mc_may_pull(skb, len))
 922                         return -EINVAL;
 923
 924                 grec = (void *)(skb->data + len - sizeof(*grec));
 925                 group = grec->grec_mca;
 926                 type = grec->grec_type;
 927
 928                 len += ntohs(grec->grec_nsrcs) * 4;
 929                 if (!ip_mc_may_pull(skb, len))
 930                         return -EINVAL;
 931
 932                 /* We treat this as an IGMPv2 report for now. */
 933                 switch (type) {
 934                 case IGMPV3_MODE_IS_INCLUDE:
 935                 case IGMPV3_MODE_IS_EXCLUDE:
 936                 case IGMPV3_CHANGE_TO_INCLUDE:
 937                 case IGMPV3_CHANGE_TO_EXCLUDE:
 938                 case IGMPV3_ALLOW_NEW_SOURCES:
 939                 case IGMPV3_BLOCK_OLD_SOURCES:
 940                         break;
 941
 942                 default:
 943                         continue;
 944                 }
 945
 946                 src = eth_hdr(skb)->h_source;
 947                 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
 948                      type == IGMPV3_MODE_IS_INCLUDE) &&
 949                     ntohs(grec->grec_nsrcs) == 0) {
 950                         br_ip4_multicast_leave_group(br, port, group, vid, src);
 951                 } else {
 952                         err = br_ip4_multicast_add_group(br, port, group, vid,
 953                                                          src);
 954                         if (err)
 955                                 break;
 956                 }
 957         }
 958
 959         return err;
 960 }
 961
 962 #if IS_ENABLED(CONFIG_IPV6)
 963 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
 964                                         struct net_bridge_port *port,
 965                                         struct sk_buff *skb,
 966                                         u16 vid)
 967 {
 968         unsigned int nsrcs_offset;
 969         const unsigned char *src;
 970         struct icmp6hdr *icmp6h;
 971         struct mld2_grec *grec;
 972         unsigned int grec_len;
 973         int i;
 974         int len;
 975         int num;
 976         int err = 0;
 977
 978         if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
 979                 return -EINVAL;
 980
 981         icmp6h = icmp6_hdr(skb);
 982         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
 983         len = skb_transport_offset(skb) + sizeof(*icmp6h);
 984
 985         for (i = 0; i < num; i++) {
 986                 __be16 *nsrcs, _nsrcs;
 987
 988                 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
 989
 990                 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
 991                     nsrcs_offset + sizeof(_nsrcs))
 992                         return -EINVAL;
 993
 994                 nsrcs = skb_header_pointer(skb, nsrcs_offset,
 995                                            sizeof(_nsrcs), &_nsrcs);
 996                 if (!nsrcs)
 997                         return -EINVAL;
 998
 999                 grec_len = struct_size(grec, grec_src, ntohs(*nsrcs));
1000
1001                 if (!ipv6_mc_may_pull(skb, len + grec_len))
1002                         return -EINVAL;
1003
1004                 grec = (struct mld2_grec *)(skb->data + len);
1005                 len += grec_len;
1006
1007                 /* We treat these as MLDv1 reports for now. */
1008                 switch (grec->grec_type) {
1009                 case MLD2_MODE_IS_INCLUDE:
1010                 case MLD2_MODE_IS_EXCLUDE:
1011                 case MLD2_CHANGE_TO_INCLUDE:
1012                 case MLD2_CHANGE_TO_EXCLUDE:
1013                 case MLD2_ALLOW_NEW_SOURCES:
1014                 case MLD2_BLOCK_OLD_SOURCES:
1015                         break;
1016
1017                 default:
1018                         continue;
1019                 }
1020
1021                 src = eth_hdr(skb)->h_source;
1022                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1023                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1024                     ntohs(*nsrcs) == 0) {
1025                         br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1026                                                      vid, src);
1027                 } else {
1028                         err = br_ip6_multicast_add_group(br, port,
1029                                                          &grec->grec_mca, vid,
1030                                                          src);
1031                         if (err)
1032                                 break;
1033                 }
1034         }
1035
1036         return err;
1037 }
1038 #endif
1039
1040 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1041                                             struct net_bridge_port *port,
1042                                             __be32 saddr)
1043 {
1044         if (!timer_pending(&br->ip4_own_query.timer) &&
1045             !timer_pending(&br->ip4_other_query.timer))
1046                 goto update;
1047
1048         if (!br->ip4_querier.addr.u.ip4)
1049                 goto update;
1050
1051         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1052                 goto update;
1053
1054         return false;
1055
1056 update:
1057         br->ip4_querier.addr.u.ip4 = saddr;
1058
1059         /* update protected by general multicast_lock by caller */
1060         rcu_assign_pointer(br->ip4_querier.port, port);
1061
1062         return true;
1063 }
1064
1065 #if IS_ENABLED(CONFIG_IPV6)
1066 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1067                                             struct net_bridge_port *port,
1068                                             struct in6_addr *saddr)
1069 {
1070         if (!timer_pending(&br->ip6_own_query.timer) &&
1071             !timer_pending(&br->ip6_other_query.timer))
1072                 goto update;
1073
1074         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1075                 goto update;
1076
1077         return false;
1078
1079 update:
1080         br->ip6_querier.addr.u.ip6 = *saddr;
1081
1082         /* update protected by general multicast_lock by caller */
1083         rcu_assign_pointer(br->ip6_querier.port, port);
1084
1085         return true;
1086 }
1087 #endif
1088
1089 static bool br_multicast_select_querier(struct net_bridge *br,
1090                                         struct net_bridge_port *port,
1091                                         struct br_ip *saddr)
1092 {
1093         switch (saddr->proto) {
1094         case htons(ETH_P_IP):
1095                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1096 #if IS_ENABLED(CONFIG_IPV6)
1097         case htons(ETH_P_IPV6):
1098                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1099 #endif
1100         }
1101
1102         return false;
1103 }
1104
1105 static void
1106 br_multicast_update_query_timer(struct net_bridge *br,
1107                                 struct bridge_mcast_other_query *query,
1108                                 unsigned long max_delay)
1109 {
1110         if (!timer_pending(&query->timer))
1111                 query->delay_time = jiffies + max_delay;
1112
1113         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1114 }
1115
1116 static void br_port_mc_router_state_change(struct net_bridge_port *p,
1117                                            bool is_mc_router)
1118 {
1119         struct switchdev_attr attr = {
1120                 .orig_dev = p->dev,
1121                 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1122                 .flags = SWITCHDEV_F_DEFER,
1123                 .u.mrouter = is_mc_router,
1124         };
1125
1126         switchdev_port_attr_set(p->dev, &attr);
1127 }
1128
1129 /*
1130  * Add port to router_list
1131  *  list is maintained ordered by pointer value
1132  *  and locked by br->multicast_lock and RCU
1133  */
1134 static void br_multicast_add_router(struct net_bridge *br,
1135                                     struct net_bridge_port *port)
1136 {
1137         struct net_bridge_port *p;
1138         struct hlist_node *slot = NULL;
1139
1140         if (!hlist_unhashed(&port->rlist))
1141                 return;
1142
1143         hlist_for_each_entry(p, &br->router_list, rlist) {
1144                 if ((unsigned long) port >= (unsigned long) p)
1145                         break;
1146                 slot = &p->rlist;
1147         }
1148
1149         if (slot)
1150                 hlist_add_behind_rcu(&port->rlist, slot);
1151         else
1152                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1153         br_rtr_notify(br->dev, port, RTM_NEWMDB);
1154         br_port_mc_router_state_change(port, true);
1155 }
1156
1157 static void br_multicast_mark_router(struct net_bridge *br,
1158                                      struct net_bridge_port *port)
1159 {
1160         unsigned long now = jiffies;
1161
1162         if (!port) {
1163                 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1164                         if (!timer_pending(&br->multicast_router_timer))
1165                                 br_mc_router_state_change(br, true);
1166                         mod_timer(&br->multicast_router_timer,
1167                                   now + br->multicast_querier_interval);
1168                 }
1169                 return;
1170         }
1171
1172         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1173             port->multicast_router == MDB_RTR_TYPE_PERM)
1174                 return;
1175
1176         br_multicast_add_router(br, port);
1177
1178         mod_timer(&port->multicast_router_timer,
1179                   now + br->multicast_querier_interval);
1180 }
1181
1182 static void br_multicast_query_received(struct net_bridge *br,
1183                                         struct net_bridge_port *port,
1184                                         struct bridge_mcast_other_query *query,
1185                                         struct br_ip *saddr,
1186                                         unsigned long max_delay)
1187 {
1188         if (!br_multicast_select_querier(br, port, saddr))
1189                 return;
1190
1191         br_multicast_update_query_timer(br, query, max_delay);
1192         br_multicast_mark_router(br, port);
1193 }
1194
1195 static void br_ip4_multicast_query(struct net_bridge *br,
1196                                    struct net_bridge_port *port,
1197                                    struct sk_buff *skb,
1198                                    u16 vid)
1199 {
1200         unsigned int transport_len = ip_transport_len(skb);
1201         const struct iphdr *iph = ip_hdr(skb);
1202         struct igmphdr *ih = igmp_hdr(skb);
1203         struct net_bridge_mdb_entry *mp;
1204         struct igmpv3_query *ih3;
1205         struct net_bridge_port_group *p;
1206         struct net_bridge_port_group __rcu **pp;
1207         struct br_ip saddr;
1208         unsigned long max_delay;
1209         unsigned long now = jiffies;
1210         __be32 group;
1211
1212         spin_lock(&br->multicast_lock);
1213         if (!netif_running(br->dev) ||
1214             (port && port->state == BR_STATE_DISABLED))
1215                 goto out;
1216
1217         group = ih->group;
1218
1219         if (transport_len == sizeof(*ih)) {
1220                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1221
1222                 if (!max_delay) {
1223                         max_delay = 10 * HZ;
1224                         group = 0;
1225                 }
1226         } else if (transport_len >= sizeof(*ih3)) {
1227                 ih3 = igmpv3_query_hdr(skb);
1228                 if (ih3->nsrcs)
1229                         goto out;
1230
1231                 max_delay = ih3->code ?
1232                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1233         } else {
1234                 goto out;
1235         }
1236
1237         if (!group) {
1238                 saddr.proto = htons(ETH_P_IP);
1239                 saddr.u.ip4 = iph->saddr;
1240
1241                 br_multicast_query_received(br, port, &br->ip4_other_query,
1242                                             &saddr, max_delay);
1243                 goto out;
1244         }
1245
1246         mp = br_mdb_ip4_get(br, group, vid);
1247         if (!mp)
1248                 goto out;
1249
1250         max_delay *= br->multicast_last_member_count;
1251
1252         if (mp->host_joined &&
1253             (timer_pending(&mp->timer) ?
1254              time_after(mp->timer.expires, now + max_delay) :
1255              try_to_del_timer_sync(&mp->timer) >= 0))
1256                 mod_timer(&mp->timer, now + max_delay);
1257
1258         for (pp = &mp->ports;
1259              (p = mlock_dereference(*pp, br)) != NULL;
1260              pp = &p->next) {
1261                 if (timer_pending(&p->timer) ?
1262                     time_after(p->timer.expires, now + max_delay) :
1263                     try_to_del_timer_sync(&p->timer) >= 0)
1264                         mod_timer(&p->timer, now + max_delay);
1265         }
1266
1267 out:
1268         spin_unlock(&br->multicast_lock);
1269 }
1270
1271 #if IS_ENABLED(CONFIG_IPV6)
1272 static int br_ip6_multicast_query(struct net_bridge *br,
1273                                   struct net_bridge_port *port,
1274                                   struct sk_buff *skb,
1275                                   u16 vid)
1276 {
1277         unsigned int transport_len = ipv6_transport_len(skb);
1278         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1279         struct mld_msg *mld;
1280         struct net_bridge_mdb_entry *mp;
1281         struct mld2_query *mld2q;
1282         struct net_bridge_port_group *p;
1283         struct net_bridge_port_group __rcu **pp;
1284         struct br_ip saddr;
1285         unsigned long max_delay;
1286         unsigned long now = jiffies;
1287         unsigned int offset = skb_transport_offset(skb);
1288         const struct in6_addr *group = NULL;
1289         bool is_general_query;
1290         int err = 0;
1291
1292         spin_lock(&br->multicast_lock);
1293         if (!netif_running(br->dev) ||
1294             (port && port->state == BR_STATE_DISABLED))
1295                 goto out;
1296
1297         if (transport_len == sizeof(*mld)) {
1298                 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1299                         err = -EINVAL;
1300                         goto out;
1301                 }
1302                 mld = (struct mld_msg *) icmp6_hdr(skb);
1303                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1304                 if (max_delay)
1305                         group = &mld->mld_mca;
1306         } else {
1307                 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1308                         err = -EINVAL;
1309                         goto out;
1310                 }
1311                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1312                 if (!mld2q->mld2q_nsrcs)
1313                         group = &mld2q->mld2q_mca;
1314
1315                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1316         }
1317
1318         is_general_query = group && ipv6_addr_any(group);
1319
1320         if (is_general_query) {
1321                 saddr.proto = htons(ETH_P_IPV6);
1322                 saddr.u.ip6 = ip6h->saddr;
1323
1324                 br_multicast_query_received(br, port, &br->ip6_other_query,
1325                                             &saddr, max_delay);
1326                 goto out;
1327         } else if (!group) {
1328                 goto out;
1329         }
1330
1331         mp = br_mdb_ip6_get(br, group, vid);
1332         if (!mp)
1333                 goto out;
1334
1335         max_delay *= br->multicast_last_member_count;
1336         if (mp->host_joined &&
1337             (timer_pending(&mp->timer) ?
1338              time_after(mp->timer.expires, now + max_delay) :
1339              try_to_del_timer_sync(&mp->timer) >= 0))
1340                 mod_timer(&mp->timer, now + max_delay);
1341
1342         for (pp = &mp->ports;
1343              (p = mlock_dereference(*pp, br)) != NULL;
1344              pp = &p->next) {
1345                 if (timer_pending(&p->timer) ?
1346                     time_after(p->timer.expires, now + max_delay) :
1347                     try_to_del_timer_sync(&p->timer) >= 0)
1348                         mod_timer(&p->timer, now + max_delay);
1349         }
1350
1351 out:
1352         spin_unlock(&br->multicast_lock);
1353         return err;
1354 }
1355 #endif
1356
1357 static void
1358 br_multicast_leave_group(struct net_bridge *br,
1359                          struct net_bridge_port *port,
1360                          struct br_ip *group,
1361                          struct bridge_mcast_other_query *other_query,
1362                          struct bridge_mcast_own_query *own_query,
1363                          const unsigned char *src)
1364 {
1365         struct net_bridge_mdb_entry *mp;
1366         struct net_bridge_port_group *p;
1367         unsigned long now;
1368         unsigned long time;
1369
1370         spin_lock(&br->multicast_lock);
1371         if (!netif_running(br->dev) ||
1372             (port && port->state == BR_STATE_DISABLED))
1373                 goto out;
1374
1375         mp = br_mdb_ip_get(br, group);
1376         if (!mp)
1377                 goto out;
1378
1379         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1380                 struct net_bridge_port_group __rcu **pp;
1381
1382                 for (pp = &mp->ports;
1383                      (p = mlock_dereference(*pp, br)) != NULL;
1384                      pp = &p->next) {
1385                         if (!br_port_group_equal(p, port, src))
1386                                 continue;
1387
1388                         rcu_assign_pointer(*pp, p->next);
1389                         hlist_del_init(&p->mglist);
1390                         del_timer(&p->timer);
1391                         kfree_rcu(p, rcu);
1392                         br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1393                                       p->flags);
1394
1395                         if (!mp->ports && !mp->host_joined &&
1396                             netif_running(br->dev))
1397                                 mod_timer(&mp->timer, jiffies);
1398                 }
1399                 goto out;
1400         }
1401
1402         if (timer_pending(&other_query->timer))
1403                 goto out;
1404
1405         if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
1406                 __br_multicast_send_query(br, port, &mp->addr);
1407
1408                 time = jiffies + br->multicast_last_member_count *
1409                                  br->multicast_last_member_interval;
1410
1411                 mod_timer(&own_query->timer, time);
1412
1413                 for (p = mlock_dereference(mp->ports, br);
1414                      p != NULL;
1415                      p = mlock_dereference(p->next, br)) {
1416                         if (!br_port_group_equal(p, port, src))
1417                                 continue;
1418
1419                         if (!hlist_unhashed(&p->mglist) &&
1420                             (timer_pending(&p->timer) ?
1421                              time_after(p->timer.expires, time) :
1422                              try_to_del_timer_sync(&p->timer) >= 0)) {
1423                                 mod_timer(&p->timer, time);
1424                         }
1425
1426                         break;
1427                 }
1428         }
1429
1430         now = jiffies;
1431         time = now + br->multicast_last_member_count *
1432                      br->multicast_last_member_interval;
1433
1434         if (!port) {
1435                 if (mp->host_joined &&
1436                     (timer_pending(&mp->timer) ?
1437                      time_after(mp->timer.expires, time) :
1438                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1439                         mod_timer(&mp->timer, time);
1440                 }
1441
1442                 goto out;
1443         }
1444
1445         for (p = mlock_dereference(mp->ports, br);
1446              p != NULL;
1447              p = mlock_dereference(p->next, br)) {
1448                 if (p->port != port)
1449                         continue;
1450
1451                 if (!hlist_unhashed(&p->mglist) &&
1452                     (timer_pending(&p->timer) ?
1453                      time_after(p->timer.expires, time) :
1454                      try_to_del_timer_sync(&p->timer) >= 0)) {
1455                         mod_timer(&p->timer, time);
1456                 }
1457
1458                 break;
1459         }
1460 out:
1461         spin_unlock(&br->multicast_lock);
1462 }
1463
1464 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1465                                          struct net_bridge_port *port,
1466                                          __be32 group,
1467                                          __u16 vid,
1468                                          const unsigned char *src)
1469 {
1470         struct br_ip br_group;
1471         struct bridge_mcast_own_query *own_query;
1472
1473         if (ipv4_is_local_multicast(group))
1474                 return;
1475
1476         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1477
1478         memset(&br_group, 0, sizeof(br_group));
1479         br_group.u.ip4 = group;
1480         br_group.proto = htons(ETH_P_IP);
1481         br_group.vid = vid;
1482
1483         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1484                                  own_query, src);
1485 }
1486
1487 #if IS_ENABLED(CONFIG_IPV6)
1488 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1489                                          struct net_bridge_port *port,
1490                                          const struct in6_addr *group,
1491                                          __u16 vid,
1492                                          const unsigned char *src)
1493 {
1494         struct br_ip br_group;
1495         struct bridge_mcast_own_query *own_query;
1496
1497         if (ipv6_addr_is_ll_all_nodes(group))
1498                 return;
1499
1500         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1501
1502         memset(&br_group, 0, sizeof(br_group));
1503         br_group.u.ip6 = *group;
1504         br_group.proto = htons(ETH_P_IPV6);
1505         br_group.vid = vid;
1506
1507         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1508                                  own_query, src);
1509 }
1510 #endif
1511
1512 static void br_multicast_err_count(const struct net_bridge *br,
1513                                    const struct net_bridge_port *p,
1514                                    __be16 proto)
1515 {
1516         struct bridge_mcast_stats __percpu *stats;
1517         struct bridge_mcast_stats *pstats;
1518
1519         if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1520                 return;
1521
1522         if (p)
1523                 stats = p->mcast_stats;
1524         else
1525                 stats = br->mcast_stats;
1526         if (WARN_ON(!stats))
1527                 return;
1528
1529         pstats = this_cpu_ptr(stats);
1530
1531         u64_stats_update_begin(&pstats->syncp);
1532         switch (proto) {
1533         case htons(ETH_P_IP):
1534                 pstats->mstats.igmp_parse_errors++;
1535                 break;
1536 #if IS_ENABLED(CONFIG_IPV6)
1537         case htons(ETH_P_IPV6):
1538                 pstats->mstats.mld_parse_errors++;
1539                 break;
1540 #endif
1541         }
1542         u64_stats_update_end(&pstats->syncp);
1543 }
1544
1545 static void br_multicast_pim(struct net_bridge *br,
1546                              struct net_bridge_port *port,
1547                              const struct sk_buff *skb)
1548 {
1549         unsigned int offset = skb_transport_offset(skb);
1550         struct pimhdr *pimhdr, _pimhdr;
1551
1552         pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1553         if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1554             pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1555                 return;
1556
1557         br_multicast_mark_router(br, port);
1558 }
1559
1560 static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
1561                                     struct net_bridge_port *port,
1562                                     struct sk_buff *skb)
1563 {
1564         if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
1565             igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
1566                 return -ENOMSG;
1567
1568         br_multicast_mark_router(br, port);
1569
1570         return 0;
1571 }
1572
1573 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1574                                  struct net_bridge_port *port,
1575                                  struct sk_buff *skb,
1576                                  u16 vid)
1577 {
1578         const unsigned char *src;
1579         struct igmphdr *ih;
1580         int err;
1581
1582         err = ip_mc_check_igmp(skb);
1583
1584         if (err == -ENOMSG) {
1585                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1586                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1587                 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1588                         if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1589                                 br_multicast_pim(br, port, skb);
1590                 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
1591                         br_ip4_multicast_mrd_rcv(br, port, skb);
1592                 }
1593
1594                 return 0;
1595         } else if (err < 0) {
1596                 br_multicast_err_count(br, port, skb->protocol);
1597                 return err;
1598         }
1599
1600         ih = igmp_hdr(skb);
1601         src = eth_hdr(skb)->h_source;
1602         BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1603
1604         switch (ih->type) {
1605         case IGMP_HOST_MEMBERSHIP_REPORT:
1606         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1607                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1608                 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1609                 break;
1610         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1611                 err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
1612                 break;
1613         case IGMP_HOST_MEMBERSHIP_QUERY:
1614                 br_ip4_multicast_query(br, port, skb, vid);
1615                 break;
1616         case IGMP_HOST_LEAVE_MESSAGE:
1617                 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1618                 break;
1619         }
1620
1621         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1622                            BR_MCAST_DIR_RX);
1623
1624         return err;
1625 }
1626
1627 #if IS_ENABLED(CONFIG_IPV6)
1628 static int br_ip6_multicast_mrd_rcv(struct net_bridge *br,
1629                                     struct net_bridge_port *port,
1630                                     struct sk_buff *skb)
1631 {
1632         int ret;
1633
1634         if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
1635                 return -ENOMSG;
1636
1637         ret = ipv6_mc_check_icmpv6(skb);
1638         if (ret < 0)
1639                 return ret;
1640
1641         if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
1642                 return -ENOMSG;
1643
1644         br_multicast_mark_router(br, port);
1645
1646         return 0;
1647 }
1648
1649 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1650                                  struct net_bridge_port *port,
1651                                  struct sk_buff *skb,
1652                                  u16 vid)
1653 {
1654         const unsigned char *src;
1655         struct mld_msg *mld;
1656         int err;
1657
1658         err = ipv6_mc_check_mld(skb);
1659
1660         if (err == -ENOMSG) {
1661                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1662                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1663
1664                 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) {
1665                         err = br_ip6_multicast_mrd_rcv(br, port, skb);
1666
1667                         if (err < 0 && err != -ENOMSG) {
1668                                 br_multicast_err_count(br, port, skb->protocol);
1669                                 return err;
1670                         }
1671                 }
1672
1673                 return 0;
1674         } else if (err < 0) {
1675                 br_multicast_err_count(br, port, skb->protocol);
1676                 return err;
1677         }
1678
1679         mld = (struct mld_msg *)skb_transport_header(skb);
1680         BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1681
1682         switch (mld->mld_type) {
1683         case ICMPV6_MGM_REPORT:
1684                 src = eth_hdr(skb)->h_source;
1685                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1686                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1687                                                  src);
1688                 break;
1689         case ICMPV6_MLD2_REPORT:
1690                 err = br_ip6_multicast_mld2_report(br, port, skb, vid);
1691                 break;
1692         case ICMPV6_MGM_QUERY:
1693                 err = br_ip6_multicast_query(br, port, skb, vid);
1694                 break;
1695         case ICMPV6_MGM_REDUCTION:
1696                 src = eth_hdr(skb)->h_source;
1697                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1698                 break;
1699         }
1700
1701         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1702                            BR_MCAST_DIR_RX);
1703
1704         return err;
1705 }
1706 #endif
1707
1708 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1709                      struct sk_buff *skb, u16 vid)
1710 {
1711         int ret = 0;
1712
1713         BR_INPUT_SKB_CB(skb)->igmp = 0;
1714         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1715
1716         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1717                 return 0;
1718
1719         switch (skb->protocol) {
1720         case htons(ETH_P_IP):
1721                 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1722                 break;
1723 #if IS_ENABLED(CONFIG_IPV6)
1724         case htons(ETH_P_IPV6):
1725                 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1726                 break;
1727 #endif
1728         }
1729
1730         return ret;
1731 }
1732
1733 static void br_multicast_query_expired(struct net_bridge *br,
1734                                        struct bridge_mcast_own_query *query,
1735                                        struct bridge_mcast_querier *querier)
1736 {
1737         spin_lock(&br->multicast_lock);
1738         if (query->startup_sent < br->multicast_startup_query_count)
1739                 query->startup_sent++;
1740
1741         RCU_INIT_POINTER(querier->port, NULL);
1742         br_multicast_send_query(br, NULL, query);
1743         spin_unlock(&br->multicast_lock);
1744 }
1745
1746 static void br_ip4_multicast_query_expired(struct timer_list *t)
1747 {
1748         struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
1749
1750         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1751 }
1752
1753 #if IS_ENABLED(CONFIG_IPV6)
1754 static void br_ip6_multicast_query_expired(struct timer_list *t)
1755 {
1756         struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
1757
1758         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1759 }
1760 #endif
1761
1762 void br_multicast_init(struct net_bridge *br)
1763 {
1764         br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
1765
1766         br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1767         br->multicast_last_member_count = 2;
1768         br->multicast_startup_query_count = 2;
1769
1770         br->multicast_last_member_interval = HZ;
1771         br->multicast_query_response_interval = 10 * HZ;
1772         br->multicast_startup_query_interval = 125 * HZ / 4;
1773         br->multicast_query_interval = 125 * HZ;
1774         br->multicast_querier_interval = 255 * HZ;
1775         br->multicast_membership_interval = 260 * HZ;
1776
1777         br->ip4_other_query.delay_time = 0;
1778         br->ip4_querier.port = NULL;
1779         br->multicast_igmp_version = 2;
1780 #if IS_ENABLED(CONFIG_IPV6)
1781         br->multicast_mld_version = 1;
1782         br->ip6_other_query.delay_time = 0;
1783         br->ip6_querier.port = NULL;
1784 #endif
1785         br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
1786         br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
1787
1788         spin_lock_init(&br->multicast_lock);
1789         timer_setup(&br->multicast_router_timer,
1790                     br_multicast_local_router_expired, 0);
1791         timer_setup(&br->ip4_other_query.timer,
1792                     br_ip4_multicast_querier_expired, 0);
1793         timer_setup(&br->ip4_own_query.timer,
1794                     br_ip4_multicast_query_expired, 0);
1795 #if IS_ENABLED(CONFIG_IPV6)
1796         timer_setup(&br->ip6_other_query.timer,
1797                     br_ip6_multicast_querier_expired, 0);
1798         timer_setup(&br->ip6_own_query.timer,
1799                     br_ip6_multicast_query_expired, 0);
1800 #endif
1801         INIT_HLIST_HEAD(&br->mdb_list);
1802 }
1803
1804 static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
1805 {
1806         struct in_device *in_dev = in_dev_get(br->dev);
1807
1808         if (!in_dev)
1809                 return;
1810
1811         __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1812         in_dev_put(in_dev);
1813 }
1814
1815 #if IS_ENABLED(CONFIG_IPV6)
1816 static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1817 {
1818         struct in6_addr addr;
1819
1820         ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1821         ipv6_dev_mc_inc(br->dev, &addr);
1822 }
1823 #else
1824 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1825 {
1826 }
1827 #endif
1828
1829 static void br_multicast_join_snoopers(struct net_bridge *br)
1830 {
1831         br_ip4_multicast_join_snoopers(br);
1832         br_ip6_multicast_join_snoopers(br);
1833 }
1834
1835 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
1836 {
1837         struct in_device *in_dev = in_dev_get(br->dev);
1838
1839         if (WARN_ON(!in_dev))
1840                 return;
1841
1842         __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1843         in_dev_put(in_dev);
1844 }
1845
1846 #if IS_ENABLED(CONFIG_IPV6)
1847 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1848 {
1849         struct in6_addr addr;
1850
1851         ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1852         ipv6_dev_mc_dec(br->dev, &addr);
1853 }
1854 #else
1855 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1856 {
1857 }
1858 #endif
1859
1860 static void br_multicast_leave_snoopers(struct net_bridge *br)
1861 {
1862         br_ip4_multicast_leave_snoopers(br);
1863         br_ip6_multicast_leave_snoopers(br);
1864 }
1865
1866 static void __br_multicast_open(struct net_bridge *br,
1867                                 struct bridge_mcast_own_query *query)
1868 {
1869         query->startup_sent = 0;
1870
1871         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1872                 return;
1873
1874         mod_timer(&query->timer, jiffies);
1875 }
1876
1877 void br_multicast_open(struct net_bridge *br)
1878 {
1879         if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1880                 br_multicast_join_snoopers(br);
1881
1882         __br_multicast_open(br, &br->ip4_own_query);
1883 #if IS_ENABLED(CONFIG_IPV6)
1884         __br_multicast_open(br, &br->ip6_own_query);
1885 #endif
1886 }
1887
1888 void br_multicast_stop(struct net_bridge *br)
1889 {
1890         del_timer_sync(&br->multicast_router_timer);
1891         del_timer_sync(&br->ip4_other_query.timer);
1892         del_timer_sync(&br->ip4_own_query.timer);
1893 #if IS_ENABLED(CONFIG_IPV6)
1894         del_timer_sync(&br->ip6_other_query.timer);
1895         del_timer_sync(&br->ip6_own_query.timer);
1896 #endif
1897
1898         if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1899                 br_multicast_leave_snoopers(br);
1900 }
1901
1902 void br_multicast_dev_del(struct net_bridge *br)
1903 {
1904         struct net_bridge_mdb_entry *mp;
1905         struct hlist_node *tmp;
1906
1907         spin_lock_bh(&br->multicast_lock);
1908         hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) {
1909                 del_timer(&mp->timer);
1910                 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
1911                                        br_mdb_rht_params);
1912                 hlist_del_rcu(&mp->mdb_node);
1913                 kfree_rcu(mp, rcu);
1914         }
1915         spin_unlock_bh(&br->multicast_lock);
1916
1917         rcu_barrier();
1918 }
1919
1920 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1921 {
1922         int err = -EINVAL;
1923
1924         spin_lock_bh(&br->multicast_lock);
1925
1926         switch (val) {
1927         case MDB_RTR_TYPE_DISABLED:
1928         case MDB_RTR_TYPE_PERM:
1929                 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
1930                 del_timer(&br->multicast_router_timer);
1931                 br->multicast_router = val;
1932                 err = 0;
1933                 break;
1934         case MDB_RTR_TYPE_TEMP_QUERY:
1935                 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
1936                         br_mc_router_state_change(br, false);
1937                 br->multicast_router = val;
1938                 err = 0;
1939                 break;
1940         }
1941
1942         spin_unlock_bh(&br->multicast_lock);
1943
1944         return err;
1945 }
1946
1947 static void __del_port_router(struct net_bridge_port *p)
1948 {
1949         if (hlist_unhashed(&p->rlist))
1950                 return;
1951         hlist_del_init_rcu(&p->rlist);
1952         br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1953         br_port_mc_router_state_change(p, false);
1954
1955         /* don't allow timer refresh */
1956         if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1957                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1958 }
1959
1960 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1961 {
1962         struct net_bridge *br = p->br;
1963         unsigned long now = jiffies;
1964         int err = -EINVAL;
1965
1966         spin_lock(&br->multicast_lock);
1967         if (p->multicast_router == val) {
1968                 /* Refresh the temp router port timer */
1969                 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1970                         mod_timer(&p->multicast_router_timer,
1971                                   now + br->multicast_querier_interval);
1972                 err = 0;
1973                 goto unlock;
1974         }
1975         switch (val) {
1976         case MDB_RTR_TYPE_DISABLED:
1977                 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1978                 __del_port_router(p);
1979                 del_timer(&p->multicast_router_timer);
1980                 break;
1981         case MDB_RTR_TYPE_TEMP_QUERY:
1982                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1983                 __del_port_router(p);
1984                 break;
1985         case MDB_RTR_TYPE_PERM:
1986                 p->multicast_router = MDB_RTR_TYPE_PERM;
1987                 del_timer(&p->multicast_router_timer);
1988                 br_multicast_add_router(br, p);
1989                 break;
1990         case MDB_RTR_TYPE_TEMP:
1991                 p->multicast_router = MDB_RTR_TYPE_TEMP;
1992                 br_multicast_mark_router(br, p);
1993                 break;
1994         default:
1995                 goto unlock;
1996         }
1997         err = 0;
1998 unlock:
1999         spin_unlock(&br->multicast_lock);
2000
2001         return err;
2002 }
2003
2004 static void br_multicast_start_querier(struct net_bridge *br,
2005                                        struct bridge_mcast_own_query *query)
2006 {
2007         struct net_bridge_port *port;
2008
2009         __br_multicast_open(br, query);
2010
2011         rcu_read_lock();
2012         list_for_each_entry_rcu(port, &br->port_list, list) {
2013                 if (port->state == BR_STATE_DISABLED ||
2014                     port->state == BR_STATE_BLOCKING)
2015                         continue;
2016
2017                 if (query == &br->ip4_own_query)
2018                         br_multicast_enable(&port->ip4_own_query);
2019 #if IS_ENABLED(CONFIG_IPV6)
2020                 else
2021                         br_multicast_enable(&port->ip6_own_query);
2022 #endif
2023         }
2024         rcu_read_unlock();
2025 }
2026
2027 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2028 {
2029         struct net_bridge_port *port;
2030
2031         spin_lock_bh(&br->multicast_lock);
2032         if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
2033                 goto unlock;
2034
2035         br_mc_disabled_update(br->dev, val);
2036         br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
2037         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
2038                 br_multicast_leave_snoopers(br);
2039                 goto unlock;
2040         }
2041
2042         if (!netif_running(br->dev))
2043                 goto unlock;
2044
2045         br_multicast_open(br);
2046         list_for_each_entry(port, &br->port_list, list)
2047                 __br_multicast_enable_port(port);
2048
2049 unlock:
2050         spin_unlock_bh(&br->multicast_lock);
2051
2052         return 0;
2053 }
2054
2055 bool br_multicast_enabled(const struct net_device *dev)
2056 {
2057         struct net_bridge *br = netdev_priv(dev);
2058
2059         return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
2060 }
2061 EXPORT_SYMBOL_GPL(br_multicast_enabled);
2062
2063 bool br_multicast_router(const struct net_device *dev)
2064 {
2065         struct net_bridge *br = netdev_priv(dev);
2066         bool is_router;
2067
2068         spin_lock_bh(&br->multicast_lock);
2069         is_router = br_multicast_is_router(br);
2070         spin_unlock_bh(&br->multicast_lock);
2071         return is_router;
2072 }
2073 EXPORT_SYMBOL_GPL(br_multicast_router);
2074
2075 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2076 {
2077         unsigned long max_delay;
2078
2079         val = !!val;
2080
2081         spin_lock_bh(&br->multicast_lock);
2082         if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
2083                 goto unlock;
2084
2085         br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
2086         if (!val)
2087                 goto unlock;
2088
2089         max_delay = br->multicast_query_response_interval;
2090
2091         if (!timer_pending(&br->ip4_other_query.timer))
2092                 br->ip4_other_query.delay_time = jiffies + max_delay;
2093
2094         br_multicast_start_querier(br, &br->ip4_own_query);
2095
2096 #if IS_ENABLED(CONFIG_IPV6)
2097         if (!timer_pending(&br->ip6_other_query.timer))
2098                 br->ip6_other_query.delay_time = jiffies + max_delay;
2099
2100         br_multicast_start_querier(br, &br->ip6_own_query);
2101 #endif
2102
2103 unlock:
2104         spin_unlock_bh(&br->multicast_lock);
2105
2106         return 0;
2107 }
2108
2109 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2110 {
2111         /* Currently we support only version 2 and 3 */
2112         switch (val) {
2113         case 2:
2114         case 3:
2115                 break;
2116         default:
2117                 return -EINVAL;
2118         }
2119
2120         spin_lock_bh(&br->multicast_lock);
2121         br->multicast_igmp_version = val;
2122         spin_unlock_bh(&br->multicast_lock);
2123
2124         return 0;
2125 }
2126
2127 #if IS_ENABLED(CONFIG_IPV6)
2128 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2129 {
2130         /* Currently we support version 1 and 2 */
2131         switch (val) {
2132         case 1:
2133         case 2:
2134                 break;
2135         default:
2136                 return -EINVAL;
2137         }
2138
2139         spin_lock_bh(&br->multicast_lock);
2140         br->multicast_mld_version = val;
2141         spin_unlock_bh(&br->multicast_lock);
2142
2143         return 0;
2144 }
2145 #endif
2146
2147 /**
2148  * br_multicast_list_adjacent - Returns snooped multicast addresses
2149  * @dev:        The bridge port adjacent to which to retrieve addresses
2150  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2151  *
2152  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2153  * snooping feature on all bridge ports of dev's bridge device, excluding
2154  * the addresses from dev itself.
2155  *
2156  * Returns the number of items added to br_ip_list.
2157  *
2158  * Notes:
2159  * - br_ip_list needs to be initialized by caller
2160  * - br_ip_list might contain duplicates in the end
2161  *   (needs to be taken care of by caller)
2162  * - br_ip_list needs to be freed by caller
2163  */
2164 int br_multicast_list_adjacent(struct net_device *dev,
2165                                struct list_head *br_ip_list)
2166 {
2167         struct net_bridge *br;
2168         struct net_bridge_port *port;
2169         struct net_bridge_port_group *group;
2170         struct br_ip_list *entry;
2171         int count = 0;
2172
2173         rcu_read_lock();
2174         if (!br_ip_list || !netif_is_bridge_port(dev))
2175                 goto unlock;
2176
2177         port = br_port_get_rcu(dev);
2178         if (!port || !port->br)
2179                 goto unlock;
2180
2181         br = port->br;
2182
2183         list_for_each_entry_rcu(port, &br->port_list, list) {
2184                 if (!port->dev || port->dev == dev)
2185                         continue;
2186
2187                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2188                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2189                         if (!entry)
2190                                 goto unlock;
2191
2192                         entry->addr = group->addr;
2193                         list_add(&entry->list, br_ip_list);
2194                         count++;
2195                 }
2196         }
2197
2198 unlock:
2199         rcu_read_unlock();
2200         return count;
2201 }
2202 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2203
2204 /**
2205  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2206  * @dev: The bridge port providing the bridge on which to check for a querier
2207  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2208  *
2209  * Checks whether the given interface has a bridge on top and if so returns
2210  * true if a valid querier exists anywhere on the bridged link layer.
2211  * Otherwise returns false.
2212  */
2213 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2214 {
2215         struct net_bridge *br;
2216         struct net_bridge_port *port;
2217         struct ethhdr eth;
2218         bool ret = false;
2219
2220         rcu_read_lock();
2221         if (!netif_is_bridge_port(dev))
2222                 goto unlock;
2223
2224         port = br_port_get_rcu(dev);
2225         if (!port || !port->br)
2226                 goto unlock;
2227
2228         br = port->br;
2229
2230         memset(&eth, 0, sizeof(eth));
2231         eth.h_proto = htons(proto);
2232
2233         ret = br_multicast_querier_exists(br, &eth);
2234
2235 unlock:
2236         rcu_read_unlock();
2237         return ret;
2238 }
2239 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2240
2241 /**
2242  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2243  * @dev: The bridge port adjacent to which to check for a querier
2244  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2245  *
2246  * Checks whether the given interface has a bridge on top and if so returns
2247  * true if a selected querier is behind one of the other ports of this
2248  * bridge. Otherwise returns false.
2249  */
2250 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2251 {
2252         struct net_bridge *br;
2253         struct net_bridge_port *port;
2254         bool ret = false;
2255
2256         rcu_read_lock();
2257         if (!netif_is_bridge_port(dev))
2258                 goto unlock;
2259
2260         port = br_port_get_rcu(dev);
2261         if (!port || !port->br)
2262                 goto unlock;
2263
2264         br = port->br;
2265
2266         switch (proto) {
2267         case ETH_P_IP:
2268                 if (!timer_pending(&br->ip4_other_query.timer) ||
2269                     rcu_dereference(br->ip4_querier.port) == port)
2270                         goto unlock;
2271                 break;
2272 #if IS_ENABLED(CONFIG_IPV6)
2273         case ETH_P_IPV6:
2274                 if (!timer_pending(&br->ip6_other_query.timer) ||
2275                     rcu_dereference(br->ip6_querier.port) == port)
2276                         goto unlock;
2277                 break;
2278 #endif
2279         default:
2280                 goto unlock;
2281         }
2282
2283         ret = true;
2284 unlock:
2285         rcu_read_unlock();
2286         return ret;
2287 }
2288 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2289
2290 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2291                                const struct sk_buff *skb, u8 type, u8 dir)
2292 {
2293         struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2294         __be16 proto = skb->protocol;
2295         unsigned int t_len;
2296
2297         u64_stats_update_begin(&pstats->syncp);
2298         switch (proto) {
2299         case htons(ETH_P_IP):
2300                 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2301                 switch (type) {
2302                 case IGMP_HOST_MEMBERSHIP_REPORT:
2303                         pstats->mstats.igmp_v1reports[dir]++;
2304                         break;
2305                 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2306                         pstats->mstats.igmp_v2reports[dir]++;
2307                         break;
2308                 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2309                         pstats->mstats.igmp_v3reports[dir]++;
2310                         break;
2311                 case IGMP_HOST_MEMBERSHIP_QUERY:
2312                         if (t_len != sizeof(struct igmphdr)) {
2313                                 pstats->mstats.igmp_v3queries[dir]++;
2314                         } else {
2315                                 unsigned int offset = skb_transport_offset(skb);
2316                                 struct igmphdr *ih, _ihdr;
2317
2318                                 ih = skb_header_pointer(skb, offset,
2319                                                         sizeof(_ihdr), &_ihdr);
2320                                 if (!ih)
2321                                         break;
2322                                 if (!ih->code)
2323                                         pstats->mstats.igmp_v1queries[dir]++;
2324                                 else
2325                                         pstats->mstats.igmp_v2queries[dir]++;
2326                         }
2327                         break;
2328                 case IGMP_HOST_LEAVE_MESSAGE:
2329                         pstats->mstats.igmp_leaves[dir]++;
2330                         break;
2331                 }
2332                 break;
2333 #if IS_ENABLED(CONFIG_IPV6)
2334         case htons(ETH_P_IPV6):
2335                 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2336                         sizeof(struct ipv6hdr);
2337                 t_len -= skb_network_header_len(skb);
2338                 switch (type) {
2339                 case ICMPV6_MGM_REPORT:
2340                         pstats->mstats.mld_v1reports[dir]++;
2341                         break;
2342                 case ICMPV6_MLD2_REPORT:
2343                         pstats->mstats.mld_v2reports[dir]++;
2344                         break;
2345                 case ICMPV6_MGM_QUERY:
2346                         if (t_len != sizeof(struct mld_msg))
2347                                 pstats->mstats.mld_v2queries[dir]++;
2348                         else
2349                                 pstats->mstats.mld_v1queries[dir]++;
2350                         break;
2351                 case ICMPV6_MGM_REDUCTION:
2352                         pstats->mstats.mld_leaves[dir]++;
2353                         break;
2354                 }
2355                 break;
2356 #endif /* CONFIG_IPV6 */
2357         }
2358         u64_stats_update_end(&pstats->syncp);
2359 }
2360
2361 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2362                         const struct sk_buff *skb, u8 type, u8 dir)
2363 {
2364         struct bridge_mcast_stats __percpu *stats;
2365
2366         /* if multicast_disabled is true then igmp type can't be set */
2367         if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
2368                 return;
2369
2370         if (p)
2371                 stats = p->mcast_stats;
2372         else
2373                 stats = br->mcast_stats;
2374         if (WARN_ON(!stats))
2375                 return;
2376
2377         br_mcast_stats_add(stats, skb, type, dir);
2378 }
2379
2380 int br_multicast_init_stats(struct net_bridge *br)
2381 {
2382         br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2383         if (!br->mcast_stats)
2384                 return -ENOMEM;
2385
2386         return 0;
2387 }
2388
2389 void br_multicast_uninit_stats(struct net_bridge *br)
2390 {
2391         free_percpu(br->mcast_stats);
2392 }
2393
2394 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2395 {
2396         dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2397         dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2398 }
2399
2400 void br_multicast_get_stats(const struct net_bridge *br,
2401                             const struct net_bridge_port *p,
2402                             struct br_mcast_stats *dest)
2403 {
2404         struct bridge_mcast_stats __percpu *stats;
2405         struct br_mcast_stats tdst;
2406         int i;
2407
2408         memset(dest, 0, sizeof(*dest));
2409         if (p)
2410                 stats = p->mcast_stats;
2411         else
2412                 stats = br->mcast_stats;
2413         if (WARN_ON(!stats))
2414                 return;
2415
2416         memset(&tdst, 0, sizeof(tdst));
2417         for_each_possible_cpu(i) {
2418                 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2419                 struct br_mcast_stats temp;
2420                 unsigned int start;
2421
2422                 do {
2423                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2424                         memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2425                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2426
2427                 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2428                 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2429                 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2430                 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2431                 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2432                 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2433                 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2434                 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2435
2436                 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2437                 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2438                 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2439                 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2440                 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2441                 tdst.mld_parse_errors += temp.mld_parse_errors;
2442         }
2443         memcpy(dest, &tdst, sizeof(*dest));
2444 }
2445
2446 int br_mdb_hash_init(struct net_bridge *br)
2447 {
2448         return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
2449 }
2450
2451 void br_mdb_hash_fini(struct net_bridge *br)
2452 {
2453         rhashtable_destroy(&br->mdb_hash_tbl);
2454 }