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         u16 nsrcs;
 915
 916         ih = igmpv3_report_hdr(skb);
 917         num = ntohs(ih->ngrec);
 918         len = skb_transport_offset(skb) + sizeof(*ih);
 919
 920         for (i = 0; i < num; i++) {
 921                 len += sizeof(*grec);
 922                 if (!ip_mc_may_pull(skb, len))
 923                         return -EINVAL;
 924
 925                 grec = (void *)(skb->data + len - sizeof(*grec));
 926                 group = grec->grec_mca;
 927                 type = grec->grec_type;
 928                 nsrcs = ntohs(grec->grec_nsrcs);
 929
 930                 len += nsrcs * 4;
 931                 if (!ip_mc_may_pull(skb, len))
 932                         return -EINVAL;
 933
 934                 /* We treat this as an IGMPv2 report for now. */
 935                 switch (type) {
 936                 case IGMPV3_MODE_IS_INCLUDE:
 937                 case IGMPV3_MODE_IS_EXCLUDE:
 938                 case IGMPV3_CHANGE_TO_INCLUDE:
 939                 case IGMPV3_CHANGE_TO_EXCLUDE:
 940                 case IGMPV3_ALLOW_NEW_SOURCES:
 941                 case IGMPV3_BLOCK_OLD_SOURCES:
 942                         break;
 943
 944                 default:
 945                         continue;
 946                 }
 947
 948                 src = eth_hdr(skb)->h_source;
 949                 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
 950                      type == IGMPV3_MODE_IS_INCLUDE) &&
 951                     nsrcs == 0) {
 952                         br_ip4_multicast_leave_group(br, port, group, vid, src);
 953                 } else {
 954                         err = br_ip4_multicast_add_group(br, port, group, vid,
 955                                                          src);
 956                         if (err)
 957                                 break;
 958                 }
 959         }
 960
 961         return err;
 962 }
 963
 964 #if IS_ENABLED(CONFIG_IPV6)
 965 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
 966                                         struct net_bridge_port *port,
 967                                         struct sk_buff *skb,
 968                                         u16 vid)
 969 {
 970         unsigned int nsrcs_offset;
 971         const unsigned char *src;
 972         struct icmp6hdr *icmp6h;
 973         struct mld2_grec *grec;
 974         unsigned int grec_len;
 975         int i;
 976         int len;
 977         int num;
 978         int err = 0;
 979
 980         if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
 981                 return -EINVAL;
 982
 983         icmp6h = icmp6_hdr(skb);
 984         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
 985         len = skb_transport_offset(skb) + sizeof(*icmp6h);
 986
 987         for (i = 0; i < num; i++) {
 988                 __be16 *_nsrcs, __nsrcs;
 989                 u16 nsrcs;
 990
 991                 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
 992
 993                 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
 994                     nsrcs_offset + sizeof(_nsrcs))
 995                         return -EINVAL;
 996
 997                 _nsrcs = skb_header_pointer(skb, nsrcs_offset,
 998                                             sizeof(__nsrcs), &__nsrcs);
 999                 if (!_nsrcs)
1000                         return -EINVAL;
1001
1002                 nsrcs = ntohs(*_nsrcs);
1003                 grec_len = struct_size(grec, grec_src, nsrcs);
1004
1005                 if (!ipv6_mc_may_pull(skb, len + grec_len))
1006                         return -EINVAL;
1007
1008                 grec = (struct mld2_grec *)(skb->data + len);
1009                 len += grec_len;
1010
1011                 /* We treat these as MLDv1 reports for now. */
1012                 switch (grec->grec_type) {
1013                 case MLD2_MODE_IS_INCLUDE:
1014                 case MLD2_MODE_IS_EXCLUDE:
1015                 case MLD2_CHANGE_TO_INCLUDE:
1016                 case MLD2_CHANGE_TO_EXCLUDE:
1017                 case MLD2_ALLOW_NEW_SOURCES:
1018                 case MLD2_BLOCK_OLD_SOURCES:
1019                         break;
1020
1021                 default:
1022                         continue;
1023                 }
1024
1025                 src = eth_hdr(skb)->h_source;
1026                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1027                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1028                     nsrcs == 0) {
1029                         br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1030                                                      vid, src);
1031                 } else {
1032                         err = br_ip6_multicast_add_group(br, port,
1033                                                          &grec->grec_mca, vid,
1034                                                          src);
1035                         if (err)
1036                                 break;
1037                 }
1038         }
1039
1040         return err;
1041 }
1042 #endif
1043
1044 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1045                                             struct net_bridge_port *port,
1046                                             __be32 saddr)
1047 {
1048         if (!timer_pending(&br->ip4_own_query.timer) &&
1049             !timer_pending(&br->ip4_other_query.timer))
1050                 goto update;
1051
1052         if (!br->ip4_querier.addr.u.ip4)
1053                 goto update;
1054
1055         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1056                 goto update;
1057
1058         return false;
1059
1060 update:
1061         br->ip4_querier.addr.u.ip4 = saddr;
1062
1063         /* update protected by general multicast_lock by caller */
1064         rcu_assign_pointer(br->ip4_querier.port, port);
1065
1066         return true;
1067 }
1068
1069 #if IS_ENABLED(CONFIG_IPV6)
1070 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1071                                             struct net_bridge_port *port,
1072                                             struct in6_addr *saddr)
1073 {
1074         if (!timer_pending(&br->ip6_own_query.timer) &&
1075             !timer_pending(&br->ip6_other_query.timer))
1076                 goto update;
1077
1078         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1079                 goto update;
1080
1081         return false;
1082
1083 update:
1084         br->ip6_querier.addr.u.ip6 = *saddr;
1085
1086         /* update protected by general multicast_lock by caller */
1087         rcu_assign_pointer(br->ip6_querier.port, port);
1088
1089         return true;
1090 }
1091 #endif
1092
1093 static bool br_multicast_select_querier(struct net_bridge *br,
1094                                         struct net_bridge_port *port,
1095                                         struct br_ip *saddr)
1096 {
1097         switch (saddr->proto) {
1098         case htons(ETH_P_IP):
1099                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1100 #if IS_ENABLED(CONFIG_IPV6)
1101         case htons(ETH_P_IPV6):
1102                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1103 #endif
1104         }
1105
1106         return false;
1107 }
1108
1109 static void
1110 br_multicast_update_query_timer(struct net_bridge *br,
1111                                 struct bridge_mcast_other_query *query,
1112                                 unsigned long max_delay)
1113 {
1114         if (!timer_pending(&query->timer))
1115                 query->delay_time = jiffies + max_delay;
1116
1117         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1118 }
1119
1120 static void br_port_mc_router_state_change(struct net_bridge_port *p,
1121                                            bool is_mc_router)
1122 {
1123         struct switchdev_attr attr = {
1124                 .orig_dev = p->dev,
1125                 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1126                 .flags = SWITCHDEV_F_DEFER,
1127                 .u.mrouter = is_mc_router,
1128         };
1129
1130         switchdev_port_attr_set(p->dev, &attr);
1131 }
1132
1133 /*
1134  * Add port to router_list
1135  *  list is maintained ordered by pointer value
1136  *  and locked by br->multicast_lock and RCU
1137  */
1138 static void br_multicast_add_router(struct net_bridge *br,
1139                                     struct net_bridge_port *port)
1140 {
1141         struct net_bridge_port *p;
1142         struct hlist_node *slot = NULL;
1143
1144         if (!hlist_unhashed(&port->rlist))
1145                 return;
1146
1147         hlist_for_each_entry(p, &br->router_list, rlist) {
1148                 if ((unsigned long) port >= (unsigned long) p)
1149                         break;
1150                 slot = &p->rlist;
1151         }
1152
1153         if (slot)
1154                 hlist_add_behind_rcu(&port->rlist, slot);
1155         else
1156                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1157         br_rtr_notify(br->dev, port, RTM_NEWMDB);
1158         br_port_mc_router_state_change(port, true);
1159 }
1160
1161 static void br_multicast_mark_router(struct net_bridge *br,
1162                                      struct net_bridge_port *port)
1163 {
1164         unsigned long now = jiffies;
1165
1166         if (!port) {
1167                 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1168                         if (!timer_pending(&br->multicast_router_timer))
1169                                 br_mc_router_state_change(br, true);
1170                         mod_timer(&br->multicast_router_timer,
1171                                   now + br->multicast_querier_interval);
1172                 }
1173                 return;
1174         }
1175
1176         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1177             port->multicast_router == MDB_RTR_TYPE_PERM)
1178                 return;
1179
1180         br_multicast_add_router(br, port);
1181
1182         mod_timer(&port->multicast_router_timer,
1183                   now + br->multicast_querier_interval);
1184 }
1185
1186 static void br_multicast_query_received(struct net_bridge *br,
1187                                         struct net_bridge_port *port,
1188                                         struct bridge_mcast_other_query *query,
1189                                         struct br_ip *saddr,
1190                                         unsigned long max_delay)
1191 {
1192         if (!br_multicast_select_querier(br, port, saddr))
1193                 return;
1194
1195         br_multicast_update_query_timer(br, query, max_delay);
1196         br_multicast_mark_router(br, port);
1197 }
1198
1199 static void br_ip4_multicast_query(struct net_bridge *br,
1200                                    struct net_bridge_port *port,
1201                                    struct sk_buff *skb,
1202                                    u16 vid)
1203 {
1204         unsigned int transport_len = ip_transport_len(skb);
1205         const struct iphdr *iph = ip_hdr(skb);
1206         struct igmphdr *ih = igmp_hdr(skb);
1207         struct net_bridge_mdb_entry *mp;
1208         struct igmpv3_query *ih3;
1209         struct net_bridge_port_group *p;
1210         struct net_bridge_port_group __rcu **pp;
1211         struct br_ip saddr;
1212         unsigned long max_delay;
1213         unsigned long now = jiffies;
1214         __be32 group;
1215
1216         spin_lock(&br->multicast_lock);
1217         if (!netif_running(br->dev) ||
1218             (port && port->state == BR_STATE_DISABLED))
1219                 goto out;
1220
1221         group = ih->group;
1222
1223         if (transport_len == sizeof(*ih)) {
1224                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1225
1226                 if (!max_delay) {
1227                         max_delay = 10 * HZ;
1228                         group = 0;
1229                 }
1230         } else if (transport_len >= sizeof(*ih3)) {
1231                 ih3 = igmpv3_query_hdr(skb);
1232                 if (ih3->nsrcs)
1233                         goto out;
1234
1235                 max_delay = ih3->code ?
1236                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1237         } else {
1238                 goto out;
1239         }
1240
1241         if (!group) {
1242                 saddr.proto = htons(ETH_P_IP);
1243                 saddr.u.ip4 = iph->saddr;
1244
1245                 br_multicast_query_received(br, port, &br->ip4_other_query,
1246                                             &saddr, max_delay);
1247                 goto out;
1248         }
1249
1250         mp = br_mdb_ip4_get(br, group, vid);
1251         if (!mp)
1252                 goto out;
1253
1254         max_delay *= br->multicast_last_member_count;
1255
1256         if (mp->host_joined &&
1257             (timer_pending(&mp->timer) ?
1258              time_after(mp->timer.expires, now + max_delay) :
1259              try_to_del_timer_sync(&mp->timer) >= 0))
1260                 mod_timer(&mp->timer, now + max_delay);
1261
1262         for (pp = &mp->ports;
1263              (p = mlock_dereference(*pp, br)) != NULL;
1264              pp = &p->next) {
1265                 if (timer_pending(&p->timer) ?
1266                     time_after(p->timer.expires, now + max_delay) :
1267                     try_to_del_timer_sync(&p->timer) >= 0)
1268                         mod_timer(&p->timer, now + max_delay);
1269         }
1270
1271 out:
1272         spin_unlock(&br->multicast_lock);
1273 }
1274
1275 #if IS_ENABLED(CONFIG_IPV6)
1276 static int br_ip6_multicast_query(struct net_bridge *br,
1277                                   struct net_bridge_port *port,
1278                                   struct sk_buff *skb,
1279                                   u16 vid)
1280 {
1281         unsigned int transport_len = ipv6_transport_len(skb);
1282         struct mld_msg *mld;
1283         struct net_bridge_mdb_entry *mp;
1284         struct mld2_query *mld2q;
1285         struct net_bridge_port_group *p;
1286         struct net_bridge_port_group __rcu **pp;
1287         struct br_ip saddr;
1288         unsigned long max_delay;
1289         unsigned long now = jiffies;
1290         unsigned int offset = skb_transport_offset(skb);
1291         const struct in6_addr *group = NULL;
1292         bool is_general_query;
1293         int err = 0;
1294
1295         spin_lock(&br->multicast_lock);
1296         if (!netif_running(br->dev) ||
1297             (port && port->state == BR_STATE_DISABLED))
1298                 goto out;
1299
1300         if (transport_len == sizeof(*mld)) {
1301                 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1302                         err = -EINVAL;
1303                         goto out;
1304                 }
1305                 mld = (struct mld_msg *) icmp6_hdr(skb);
1306                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1307                 if (max_delay)
1308                         group = &mld->mld_mca;
1309         } else {
1310                 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1311                         err = -EINVAL;
1312                         goto out;
1313                 }
1314                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1315                 if (!mld2q->mld2q_nsrcs)
1316                         group = &mld2q->mld2q_mca;
1317
1318                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1319         }
1320
1321         is_general_query = group && ipv6_addr_any(group);
1322
1323         if (is_general_query) {
1324                 saddr.proto = htons(ETH_P_IPV6);
1325                 saddr.u.ip6 = ipv6_hdr(skb)->saddr;
1326
1327                 br_multicast_query_received(br, port, &br->ip6_other_query,
1328                                             &saddr, max_delay);
1329                 goto out;
1330         } else if (!group) {
1331                 goto out;
1332         }
1333
1334         mp = br_mdb_ip6_get(br, group, vid);
1335         if (!mp)
1336                 goto out;
1337
1338         max_delay *= br->multicast_last_member_count;
1339         if (mp->host_joined &&
1340             (timer_pending(&mp->timer) ?
1341              time_after(mp->timer.expires, now + max_delay) :
1342              try_to_del_timer_sync(&mp->timer) >= 0))
1343                 mod_timer(&mp->timer, now + max_delay);
1344
1345         for (pp = &mp->ports;
1346              (p = mlock_dereference(*pp, br)) != NULL;
1347              pp = &p->next) {
1348                 if (timer_pending(&p->timer) ?
1349                     time_after(p->timer.expires, now + max_delay) :
1350                     try_to_del_timer_sync(&p->timer) >= 0)
1351                         mod_timer(&p->timer, now + max_delay);
1352         }
1353
1354 out:
1355         spin_unlock(&br->multicast_lock);
1356         return err;
1357 }
1358 #endif
1359
1360 static void
1361 br_multicast_leave_group(struct net_bridge *br,
1362                          struct net_bridge_port *port,
1363                          struct br_ip *group,
1364                          struct bridge_mcast_other_query *other_query,
1365                          struct bridge_mcast_own_query *own_query,
1366                          const unsigned char *src)
1367 {
1368         struct net_bridge_mdb_entry *mp;
1369         struct net_bridge_port_group *p;
1370         unsigned long now;
1371         unsigned long time;
1372
1373         spin_lock(&br->multicast_lock);
1374         if (!netif_running(br->dev) ||
1375             (port && port->state == BR_STATE_DISABLED))
1376                 goto out;
1377
1378         mp = br_mdb_ip_get(br, group);
1379         if (!mp)
1380                 goto out;
1381
1382         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1383                 struct net_bridge_port_group __rcu **pp;
1384
1385                 for (pp = &mp->ports;
1386                      (p = mlock_dereference(*pp, br)) != NULL;
1387                      pp = &p->next) {
1388                         if (!br_port_group_equal(p, port, src))
1389                                 continue;
1390
1391                         if (p->flags & MDB_PG_FLAGS_PERMANENT)
1392                                 break;
1393
1394                         rcu_assign_pointer(*pp, p->next);
1395                         hlist_del_init(&p->mglist);
1396                         del_timer(&p->timer);
1397                         kfree_rcu(p, rcu);
1398                         br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1399                                       p->flags);
1400
1401                         if (!mp->ports && !mp->host_joined &&
1402                             netif_running(br->dev))
1403                                 mod_timer(&mp->timer, jiffies);
1404                 }
1405                 goto out;
1406         }
1407
1408         if (timer_pending(&other_query->timer))
1409                 goto out;
1410
1411         if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
1412                 __br_multicast_send_query(br, port, &mp->addr);
1413
1414                 time = jiffies + br->multicast_last_member_count *
1415                                  br->multicast_last_member_interval;
1416
1417                 mod_timer(&own_query->timer, time);
1418
1419                 for (p = mlock_dereference(mp->ports, br);
1420                      p != NULL;
1421                      p = mlock_dereference(p->next, br)) {
1422                         if (!br_port_group_equal(p, port, src))
1423                                 continue;
1424
1425                         if (!hlist_unhashed(&p->mglist) &&
1426                             (timer_pending(&p->timer) ?
1427                              time_after(p->timer.expires, time) :
1428                              try_to_del_timer_sync(&p->timer) >= 0)) {
1429                                 mod_timer(&p->timer, time);
1430                         }
1431
1432                         break;
1433                 }
1434         }
1435
1436         now = jiffies;
1437         time = now + br->multicast_last_member_count *
1438                      br->multicast_last_member_interval;
1439
1440         if (!port) {
1441                 if (mp->host_joined &&
1442                     (timer_pending(&mp->timer) ?
1443                      time_after(mp->timer.expires, time) :
1444                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1445                         mod_timer(&mp->timer, time);
1446                 }
1447
1448                 goto out;
1449         }
1450
1451         for (p = mlock_dereference(mp->ports, br);
1452              p != NULL;
1453              p = mlock_dereference(p->next, br)) {
1454                 if (p->port != port)
1455                         continue;
1456
1457                 if (!hlist_unhashed(&p->mglist) &&
1458                     (timer_pending(&p->timer) ?
1459                      time_after(p->timer.expires, time) :
1460                      try_to_del_timer_sync(&p->timer) >= 0)) {
1461                         mod_timer(&p->timer, time);
1462                 }
1463
1464                 break;
1465         }
1466 out:
1467         spin_unlock(&br->multicast_lock);
1468 }
1469
1470 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1471                                          struct net_bridge_port *port,
1472                                          __be32 group,
1473                                          __u16 vid,
1474                                          const unsigned char *src)
1475 {
1476         struct br_ip br_group;
1477         struct bridge_mcast_own_query *own_query;
1478
1479         if (ipv4_is_local_multicast(group))
1480                 return;
1481
1482         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1483
1484         memset(&br_group, 0, sizeof(br_group));
1485         br_group.u.ip4 = group;
1486         br_group.proto = htons(ETH_P_IP);
1487         br_group.vid = vid;
1488
1489         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1490                                  own_query, src);
1491 }
1492
1493 #if IS_ENABLED(CONFIG_IPV6)
1494 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1495                                          struct net_bridge_port *port,
1496                                          const struct in6_addr *group,
1497                                          __u16 vid,
1498                                          const unsigned char *src)
1499 {
1500         struct br_ip br_group;
1501         struct bridge_mcast_own_query *own_query;
1502
1503         if (ipv6_addr_is_ll_all_nodes(group))
1504                 return;
1505
1506         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1507
1508         memset(&br_group, 0, sizeof(br_group));
1509         br_group.u.ip6 = *group;
1510         br_group.proto = htons(ETH_P_IPV6);
1511         br_group.vid = vid;
1512
1513         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1514                                  own_query, src);
1515 }
1516 #endif
1517
1518 static void br_multicast_err_count(const struct net_bridge *br,
1519                                    const struct net_bridge_port *p,
1520                                    __be16 proto)
1521 {
1522         struct bridge_mcast_stats __percpu *stats;
1523         struct bridge_mcast_stats *pstats;
1524
1525         if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1526                 return;
1527
1528         if (p)
1529                 stats = p->mcast_stats;
1530         else
1531                 stats = br->mcast_stats;
1532         if (WARN_ON(!stats))
1533                 return;
1534
1535         pstats = this_cpu_ptr(stats);
1536
1537         u64_stats_update_begin(&pstats->syncp);
1538         switch (proto) {
1539         case htons(ETH_P_IP):
1540                 pstats->mstats.igmp_parse_errors++;
1541                 break;
1542 #if IS_ENABLED(CONFIG_IPV6)
1543         case htons(ETH_P_IPV6):
1544                 pstats->mstats.mld_parse_errors++;
1545                 break;
1546 #endif
1547         }
1548         u64_stats_update_end(&pstats->syncp);
1549 }
1550
1551 static void br_multicast_pim(struct net_bridge *br,
1552                              struct net_bridge_port *port,
1553                              const struct sk_buff *skb)
1554 {
1555         unsigned int offset = skb_transport_offset(skb);
1556         struct pimhdr *pimhdr, _pimhdr;
1557
1558         pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1559         if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1560             pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1561                 return;
1562
1563         br_multicast_mark_router(br, port);
1564 }
1565
1566 static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
1567                                     struct net_bridge_port *port,
1568                                     struct sk_buff *skb)
1569 {
1570         if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
1571             igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
1572                 return -ENOMSG;
1573
1574         br_multicast_mark_router(br, port);
1575
1576         return 0;
1577 }
1578
1579 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1580                                  struct net_bridge_port *port,
1581                                  struct sk_buff *skb,
1582                                  u16 vid)
1583 {
1584         const unsigned char *src;
1585         struct igmphdr *ih;
1586         int err;
1587
1588         err = ip_mc_check_igmp(skb);
1589
1590         if (err == -ENOMSG) {
1591                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1592                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1593                 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1594                         if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1595                                 br_multicast_pim(br, port, skb);
1596                 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
1597                         br_ip4_multicast_mrd_rcv(br, port, skb);
1598                 }
1599
1600                 return 0;
1601         } else if (err < 0) {
1602                 br_multicast_err_count(br, port, skb->protocol);
1603                 return err;
1604         }
1605
1606         ih = igmp_hdr(skb);
1607         src = eth_hdr(skb)->h_source;
1608         BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1609
1610         switch (ih->type) {
1611         case IGMP_HOST_MEMBERSHIP_REPORT:
1612         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1613                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1614                 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1615                 break;
1616         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1617                 err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
1618                 break;
1619         case IGMP_HOST_MEMBERSHIP_QUERY:
1620                 br_ip4_multicast_query(br, port, skb, vid);
1621                 break;
1622         case IGMP_HOST_LEAVE_MESSAGE:
1623                 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1624                 break;
1625         }
1626
1627         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1628                            BR_MCAST_DIR_RX);
1629
1630         return err;
1631 }
1632
1633 #if IS_ENABLED(CONFIG_IPV6)
1634 static int br_ip6_multicast_mrd_rcv(struct net_bridge *br,
1635                                     struct net_bridge_port *port,
1636                                     struct sk_buff *skb)
1637 {
1638         int ret;
1639
1640         if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
1641                 return -ENOMSG;
1642
1643         ret = ipv6_mc_check_icmpv6(skb);
1644         if (ret < 0)
1645                 return ret;
1646
1647         if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
1648                 return -ENOMSG;
1649
1650         br_multicast_mark_router(br, port);
1651
1652         return 0;
1653 }
1654
1655 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1656                                  struct net_bridge_port *port,
1657                                  struct sk_buff *skb,
1658                                  u16 vid)
1659 {
1660         const unsigned char *src;
1661         struct mld_msg *mld;
1662         int err;
1663
1664         err = ipv6_mc_check_mld(skb);
1665
1666         if (err == -ENOMSG) {
1667                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1668                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1669
1670                 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) {
1671                         err = br_ip6_multicast_mrd_rcv(br, port, skb);
1672
1673                         if (err < 0 && err != -ENOMSG) {
1674                                 br_multicast_err_count(br, port, skb->protocol);
1675                                 return err;
1676                         }
1677                 }
1678
1679                 return 0;
1680         } else if (err < 0) {
1681                 br_multicast_err_count(br, port, skb->protocol);
1682                 return err;
1683         }
1684
1685         mld = (struct mld_msg *)skb_transport_header(skb);
1686         BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1687
1688         switch (mld->mld_type) {
1689         case ICMPV6_MGM_REPORT:
1690                 src = eth_hdr(skb)->h_source;
1691                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1692                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1693                                                  src);
1694                 break;
1695         case ICMPV6_MLD2_REPORT:
1696                 err = br_ip6_multicast_mld2_report(br, port, skb, vid);
1697                 break;
1698         case ICMPV6_MGM_QUERY:
1699                 err = br_ip6_multicast_query(br, port, skb, vid);
1700                 break;
1701         case ICMPV6_MGM_REDUCTION:
1702                 src = eth_hdr(skb)->h_source;
1703                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1704                 break;
1705         }
1706
1707         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1708                            BR_MCAST_DIR_RX);
1709
1710         return err;
1711 }
1712 #endif
1713
1714 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1715                      struct sk_buff *skb, u16 vid)
1716 {
1717         int ret = 0;
1718
1719         BR_INPUT_SKB_CB(skb)->igmp = 0;
1720         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1721
1722         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1723                 return 0;
1724
1725         switch (skb->protocol) {
1726         case htons(ETH_P_IP):
1727                 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1728                 break;
1729 #if IS_ENABLED(CONFIG_IPV6)
1730         case htons(ETH_P_IPV6):
1731                 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1732                 break;
1733 #endif
1734         }
1735
1736         return ret;
1737 }
1738
1739 static void br_multicast_query_expired(struct net_bridge *br,
1740                                        struct bridge_mcast_own_query *query,
1741                                        struct bridge_mcast_querier *querier)
1742 {
1743         spin_lock(&br->multicast_lock);
1744         if (query->startup_sent < br->multicast_startup_query_count)
1745                 query->startup_sent++;
1746
1747         RCU_INIT_POINTER(querier->port, NULL);
1748         br_multicast_send_query(br, NULL, query);
1749         spin_unlock(&br->multicast_lock);
1750 }
1751
1752 static void br_ip4_multicast_query_expired(struct timer_list *t)
1753 {
1754         struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
1755
1756         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1757 }
1758
1759 #if IS_ENABLED(CONFIG_IPV6)
1760 static void br_ip6_multicast_query_expired(struct timer_list *t)
1761 {
1762         struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
1763
1764         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1765 }
1766 #endif
1767
1768 void br_multicast_init(struct net_bridge *br)
1769 {
1770         br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
1771
1772         br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1773         br->multicast_last_member_count = 2;
1774         br->multicast_startup_query_count = 2;
1775
1776         br->multicast_last_member_interval = HZ;
1777         br->multicast_query_response_interval = 10 * HZ;
1778         br->multicast_startup_query_interval = 125 * HZ / 4;
1779         br->multicast_query_interval = 125 * HZ;
1780         br->multicast_querier_interval = 255 * HZ;
1781         br->multicast_membership_interval = 260 * HZ;
1782
1783         br->ip4_other_query.delay_time = 0;
1784         br->ip4_querier.port = NULL;
1785         br->multicast_igmp_version = 2;
1786 #if IS_ENABLED(CONFIG_IPV6)
1787         br->multicast_mld_version = 1;
1788         br->ip6_other_query.delay_time = 0;
1789         br->ip6_querier.port = NULL;
1790 #endif
1791         br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
1792         br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
1793
1794         spin_lock_init(&br->multicast_lock);
1795         timer_setup(&br->multicast_router_timer,
1796                     br_multicast_local_router_expired, 0);
1797         timer_setup(&br->ip4_other_query.timer,
1798                     br_ip4_multicast_querier_expired, 0);
1799         timer_setup(&br->ip4_own_query.timer,
1800                     br_ip4_multicast_query_expired, 0);
1801 #if IS_ENABLED(CONFIG_IPV6)
1802         timer_setup(&br->ip6_other_query.timer,
1803                     br_ip6_multicast_querier_expired, 0);
1804         timer_setup(&br->ip6_own_query.timer,
1805                     br_ip6_multicast_query_expired, 0);
1806 #endif
1807         INIT_HLIST_HEAD(&br->mdb_list);
1808 }
1809
1810 static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
1811 {
1812         struct in_device *in_dev = in_dev_get(br->dev);
1813
1814         if (!in_dev)
1815                 return;
1816
1817         __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1818         in_dev_put(in_dev);
1819 }
1820
1821 #if IS_ENABLED(CONFIG_IPV6)
1822 static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1823 {
1824         struct in6_addr addr;
1825
1826         ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1827         ipv6_dev_mc_inc(br->dev, &addr);
1828 }
1829 #else
1830 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1831 {
1832 }
1833 #endif
1834
1835 static void br_multicast_join_snoopers(struct net_bridge *br)
1836 {
1837         br_ip4_multicast_join_snoopers(br);
1838         br_ip6_multicast_join_snoopers(br);
1839 }
1840
1841 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
1842 {
1843         struct in_device *in_dev = in_dev_get(br->dev);
1844
1845         if (WARN_ON(!in_dev))
1846                 return;
1847
1848         __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1849         in_dev_put(in_dev);
1850 }
1851
1852 #if IS_ENABLED(CONFIG_IPV6)
1853 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1854 {
1855         struct in6_addr addr;
1856
1857         ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1858         ipv6_dev_mc_dec(br->dev, &addr);
1859 }
1860 #else
1861 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1862 {
1863 }
1864 #endif
1865
1866 static void br_multicast_leave_snoopers(struct net_bridge *br)
1867 {
1868         br_ip4_multicast_leave_snoopers(br);
1869         br_ip6_multicast_leave_snoopers(br);
1870 }
1871
1872 static void __br_multicast_open(struct net_bridge *br,
1873                                 struct bridge_mcast_own_query *query)
1874 {
1875         query->startup_sent = 0;
1876
1877         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1878                 return;
1879
1880         mod_timer(&query->timer, jiffies);
1881 }
1882
1883 void br_multicast_open(struct net_bridge *br)
1884 {
1885         if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1886                 br_multicast_join_snoopers(br);
1887
1888         __br_multicast_open(br, &br->ip4_own_query);
1889 #if IS_ENABLED(CONFIG_IPV6)
1890         __br_multicast_open(br, &br->ip6_own_query);
1891 #endif
1892 }
1893
1894 void br_multicast_stop(struct net_bridge *br)
1895 {
1896         del_timer_sync(&br->multicast_router_timer);
1897         del_timer_sync(&br->ip4_other_query.timer);
1898         del_timer_sync(&br->ip4_own_query.timer);
1899 #if IS_ENABLED(CONFIG_IPV6)
1900         del_timer_sync(&br->ip6_other_query.timer);
1901         del_timer_sync(&br->ip6_own_query.timer);
1902 #endif
1903
1904         if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1905                 br_multicast_leave_snoopers(br);
1906 }
1907
1908 void br_multicast_dev_del(struct net_bridge *br)
1909 {
1910         struct net_bridge_mdb_entry *mp;
1911         struct hlist_node *tmp;
1912
1913         spin_lock_bh(&br->multicast_lock);
1914         hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) {
1915                 del_timer(&mp->timer);
1916                 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
1917                                        br_mdb_rht_params);
1918                 hlist_del_rcu(&mp->mdb_node);
1919                 kfree_rcu(mp, rcu);
1920         }
1921         spin_unlock_bh(&br->multicast_lock);
1922
1923         rcu_barrier();
1924 }
1925
1926 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1927 {
1928         int err = -EINVAL;
1929
1930         spin_lock_bh(&br->multicast_lock);
1931
1932         switch (val) {
1933         case MDB_RTR_TYPE_DISABLED:
1934         case MDB_RTR_TYPE_PERM:
1935                 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
1936                 del_timer(&br->multicast_router_timer);
1937                 br->multicast_router = val;
1938                 err = 0;
1939                 break;
1940         case MDB_RTR_TYPE_TEMP_QUERY:
1941                 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
1942                         br_mc_router_state_change(br, false);
1943                 br->multicast_router = val;
1944                 err = 0;
1945                 break;
1946         }
1947
1948         spin_unlock_bh(&br->multicast_lock);
1949
1950         return err;
1951 }
1952
1953 static void __del_port_router(struct net_bridge_port *p)
1954 {
1955         if (hlist_unhashed(&p->rlist))
1956                 return;
1957         hlist_del_init_rcu(&p->rlist);
1958         br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1959         br_port_mc_router_state_change(p, false);
1960
1961         /* don't allow timer refresh */
1962         if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1963                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1964 }
1965
1966 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1967 {
1968         struct net_bridge *br = p->br;
1969         unsigned long now = jiffies;
1970         int err = -EINVAL;
1971
1972         spin_lock(&br->multicast_lock);
1973         if (p->multicast_router == val) {
1974                 /* Refresh the temp router port timer */
1975                 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1976                         mod_timer(&p->multicast_router_timer,
1977                                   now + br->multicast_querier_interval);
1978                 err = 0;
1979                 goto unlock;
1980         }
1981         switch (val) {
1982         case MDB_RTR_TYPE_DISABLED:
1983                 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1984                 __del_port_router(p);
1985                 del_timer(&p->multicast_router_timer);
1986                 break;
1987         case MDB_RTR_TYPE_TEMP_QUERY:
1988                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1989                 __del_port_router(p);
1990                 break;
1991         case MDB_RTR_TYPE_PERM:
1992                 p->multicast_router = MDB_RTR_TYPE_PERM;
1993                 del_timer(&p->multicast_router_timer);
1994                 br_multicast_add_router(br, p);
1995                 break;
1996         case MDB_RTR_TYPE_TEMP:
1997                 p->multicast_router = MDB_RTR_TYPE_TEMP;
1998                 br_multicast_mark_router(br, p);
1999                 break;
2000         default:
2001                 goto unlock;
2002         }
2003         err = 0;
2004 unlock:
2005         spin_unlock(&br->multicast_lock);
2006
2007         return err;
2008 }
2009
2010 static void br_multicast_start_querier(struct net_bridge *br,
2011                                        struct bridge_mcast_own_query *query)
2012 {
2013         struct net_bridge_port *port;
2014
2015         __br_multicast_open(br, query);
2016
2017         rcu_read_lock();
2018         list_for_each_entry_rcu(port, &br->port_list, list) {
2019                 if (port->state == BR_STATE_DISABLED ||
2020                     port->state == BR_STATE_BLOCKING)
2021                         continue;
2022
2023                 if (query == &br->ip4_own_query)
2024                         br_multicast_enable(&port->ip4_own_query);
2025 #if IS_ENABLED(CONFIG_IPV6)
2026                 else
2027                         br_multicast_enable(&port->ip6_own_query);
2028 #endif
2029         }
2030         rcu_read_unlock();
2031 }
2032
2033 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2034 {
2035         struct net_bridge_port *port;
2036
2037         spin_lock_bh(&br->multicast_lock);
2038         if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
2039                 goto unlock;
2040
2041         br_mc_disabled_update(br->dev, val);
2042         br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
2043         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
2044                 br_multicast_leave_snoopers(br);
2045                 goto unlock;
2046         }
2047
2048         if (!netif_running(br->dev))
2049                 goto unlock;
2050
2051         br_multicast_open(br);
2052         list_for_each_entry(port, &br->port_list, list)
2053                 __br_multicast_enable_port(port);
2054
2055 unlock:
2056         spin_unlock_bh(&br->multicast_lock);
2057
2058         return 0;
2059 }
2060
2061 bool br_multicast_enabled(const struct net_device *dev)
2062 {
2063         struct net_bridge *br = netdev_priv(dev);
2064
2065         return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
2066 }
2067 EXPORT_SYMBOL_GPL(br_multicast_enabled);
2068
2069 bool br_multicast_router(const struct net_device *dev)
2070 {
2071         struct net_bridge *br = netdev_priv(dev);
2072         bool is_router;
2073
2074         spin_lock_bh(&br->multicast_lock);
2075         is_router = br_multicast_is_router(br);
2076         spin_unlock_bh(&br->multicast_lock);
2077         return is_router;
2078 }
2079 EXPORT_SYMBOL_GPL(br_multicast_router);
2080
2081 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2082 {
2083         unsigned long max_delay;
2084
2085         val = !!val;
2086
2087         spin_lock_bh(&br->multicast_lock);
2088         if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
2089                 goto unlock;
2090
2091         br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
2092         if (!val)
2093                 goto unlock;
2094
2095         max_delay = br->multicast_query_response_interval;
2096
2097         if (!timer_pending(&br->ip4_other_query.timer))
2098                 br->ip4_other_query.delay_time = jiffies + max_delay;
2099
2100         br_multicast_start_querier(br, &br->ip4_own_query);
2101
2102 #if IS_ENABLED(CONFIG_IPV6)
2103         if (!timer_pending(&br->ip6_other_query.timer))
2104                 br->ip6_other_query.delay_time = jiffies + max_delay;
2105
2106         br_multicast_start_querier(br, &br->ip6_own_query);
2107 #endif
2108
2109 unlock:
2110         spin_unlock_bh(&br->multicast_lock);
2111
2112         return 0;
2113 }
2114
2115 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2116 {
2117         /* Currently we support only version 2 and 3 */
2118         switch (val) {
2119         case 2:
2120         case 3:
2121                 break;
2122         default:
2123                 return -EINVAL;
2124         }
2125
2126         spin_lock_bh(&br->multicast_lock);
2127         br->multicast_igmp_version = val;
2128         spin_unlock_bh(&br->multicast_lock);
2129
2130         return 0;
2131 }
2132
2133 #if IS_ENABLED(CONFIG_IPV6)
2134 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2135 {
2136         /* Currently we support version 1 and 2 */
2137         switch (val) {
2138         case 1:
2139         case 2:
2140                 break;
2141         default:
2142                 return -EINVAL;
2143         }
2144
2145         spin_lock_bh(&br->multicast_lock);
2146         br->multicast_mld_version = val;
2147         spin_unlock_bh(&br->multicast_lock);
2148
2149         return 0;
2150 }
2151 #endif
2152
2153 /**
2154  * br_multicast_list_adjacent - Returns snooped multicast addresses
2155  * @dev:        The bridge port adjacent to which to retrieve addresses
2156  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2157  *
2158  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2159  * snooping feature on all bridge ports of dev's bridge device, excluding
2160  * the addresses from dev itself.
2161  *
2162  * Returns the number of items added to br_ip_list.
2163  *
2164  * Notes:
2165  * - br_ip_list needs to be initialized by caller
2166  * - br_ip_list might contain duplicates in the end
2167  *   (needs to be taken care of by caller)
2168  * - br_ip_list needs to be freed by caller
2169  */
2170 int br_multicast_list_adjacent(struct net_device *dev,
2171                                struct list_head *br_ip_list)
2172 {
2173         struct net_bridge *br;
2174         struct net_bridge_port *port;
2175         struct net_bridge_port_group *group;
2176         struct br_ip_list *entry;
2177         int count = 0;
2178
2179         rcu_read_lock();
2180         if (!br_ip_list || !netif_is_bridge_port(dev))
2181                 goto unlock;
2182
2183         port = br_port_get_rcu(dev);
2184         if (!port || !port->br)
2185                 goto unlock;
2186
2187         br = port->br;
2188
2189         list_for_each_entry_rcu(port, &br->port_list, list) {
2190                 if (!port->dev || port->dev == dev)
2191                         continue;
2192
2193                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2194                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2195                         if (!entry)
2196                                 goto unlock;
2197
2198                         entry->addr = group->addr;
2199                         list_add(&entry->list, br_ip_list);
2200                         count++;
2201                 }
2202         }
2203
2204 unlock:
2205         rcu_read_unlock();
2206         return count;
2207 }
2208 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2209
2210 /**
2211  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2212  * @dev: The bridge port providing the bridge on which to check for a querier
2213  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2214  *
2215  * Checks whether the given interface has a bridge on top and if so returns
2216  * true if a valid querier exists anywhere on the bridged link layer.
2217  * Otherwise returns false.
2218  */
2219 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2220 {
2221         struct net_bridge *br;
2222         struct net_bridge_port *port;
2223         struct ethhdr eth;
2224         bool ret = false;
2225
2226         rcu_read_lock();
2227         if (!netif_is_bridge_port(dev))
2228                 goto unlock;
2229
2230         port = br_port_get_rcu(dev);
2231         if (!port || !port->br)
2232                 goto unlock;
2233
2234         br = port->br;
2235
2236         memset(&eth, 0, sizeof(eth));
2237         eth.h_proto = htons(proto);
2238
2239         ret = br_multicast_querier_exists(br, &eth);
2240
2241 unlock:
2242         rcu_read_unlock();
2243         return ret;
2244 }
2245 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2246
2247 /**
2248  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2249  * @dev: The bridge port adjacent to which to check for a querier
2250  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2251  *
2252  * Checks whether the given interface has a bridge on top and if so returns
2253  * true if a selected querier is behind one of the other ports of this
2254  * bridge. Otherwise returns false.
2255  */
2256 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2257 {
2258         struct net_bridge *br;
2259         struct net_bridge_port *port;
2260         bool ret = false;
2261
2262         rcu_read_lock();
2263         if (!netif_is_bridge_port(dev))
2264                 goto unlock;
2265
2266         port = br_port_get_rcu(dev);
2267         if (!port || !port->br)
2268                 goto unlock;
2269
2270         br = port->br;
2271
2272         switch (proto) {
2273         case ETH_P_IP:
2274                 if (!timer_pending(&br->ip4_other_query.timer) ||
2275                     rcu_dereference(br->ip4_querier.port) == port)
2276                         goto unlock;
2277                 break;
2278 #if IS_ENABLED(CONFIG_IPV6)
2279         case ETH_P_IPV6:
2280                 if (!timer_pending(&br->ip6_other_query.timer) ||
2281                     rcu_dereference(br->ip6_querier.port) == port)
2282                         goto unlock;
2283                 break;
2284 #endif
2285         default:
2286                 goto unlock;
2287         }
2288
2289         ret = true;
2290 unlock:
2291         rcu_read_unlock();
2292         return ret;
2293 }
2294 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2295
2296 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2297                                const struct sk_buff *skb, u8 type, u8 dir)
2298 {
2299         struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2300         __be16 proto = skb->protocol;
2301         unsigned int t_len;
2302
2303         u64_stats_update_begin(&pstats->syncp);
2304         switch (proto) {
2305         case htons(ETH_P_IP):
2306                 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2307                 switch (type) {
2308                 case IGMP_HOST_MEMBERSHIP_REPORT:
2309                         pstats->mstats.igmp_v1reports[dir]++;
2310                         break;
2311                 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2312                         pstats->mstats.igmp_v2reports[dir]++;
2313                         break;
2314                 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2315                         pstats->mstats.igmp_v3reports[dir]++;
2316                         break;
2317                 case IGMP_HOST_MEMBERSHIP_QUERY:
2318                         if (t_len != sizeof(struct igmphdr)) {
2319                                 pstats->mstats.igmp_v3queries[dir]++;
2320                         } else {
2321                                 unsigned int offset = skb_transport_offset(skb);
2322                                 struct igmphdr *ih, _ihdr;
2323
2324                                 ih = skb_header_pointer(skb, offset,
2325                                                         sizeof(_ihdr), &_ihdr);
2326                                 if (!ih)
2327                                         break;
2328                                 if (!ih->code)
2329                                         pstats->mstats.igmp_v1queries[dir]++;
2330                                 else
2331                                         pstats->mstats.igmp_v2queries[dir]++;
2332                         }
2333                         break;
2334                 case IGMP_HOST_LEAVE_MESSAGE:
2335                         pstats->mstats.igmp_leaves[dir]++;
2336                         break;
2337                 }
2338                 break;
2339 #if IS_ENABLED(CONFIG_IPV6)
2340         case htons(ETH_P_IPV6):
2341                 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2342                         sizeof(struct ipv6hdr);
2343                 t_len -= skb_network_header_len(skb);
2344                 switch (type) {
2345                 case ICMPV6_MGM_REPORT:
2346                         pstats->mstats.mld_v1reports[dir]++;
2347                         break;
2348                 case ICMPV6_MLD2_REPORT:
2349                         pstats->mstats.mld_v2reports[dir]++;
2350                         break;
2351                 case ICMPV6_MGM_QUERY:
2352                         if (t_len != sizeof(struct mld_msg))
2353                                 pstats->mstats.mld_v2queries[dir]++;
2354                         else
2355                                 pstats->mstats.mld_v1queries[dir]++;
2356                         break;
2357                 case ICMPV6_MGM_REDUCTION:
2358                         pstats->mstats.mld_leaves[dir]++;
2359                         break;
2360                 }
2361                 break;
2362 #endif /* CONFIG_IPV6 */
2363         }
2364         u64_stats_update_end(&pstats->syncp);
2365 }
2366
2367 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2368                         const struct sk_buff *skb, u8 type, u8 dir)
2369 {
2370         struct bridge_mcast_stats __percpu *stats;
2371
2372         /* if multicast_disabled is true then igmp type can't be set */
2373         if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
2374                 return;
2375
2376         if (p)
2377                 stats = p->mcast_stats;
2378         else
2379                 stats = br->mcast_stats;
2380         if (WARN_ON(!stats))
2381                 return;
2382
2383         br_mcast_stats_add(stats, skb, type, dir);
2384 }
2385
2386 int br_multicast_init_stats(struct net_bridge *br)
2387 {
2388         br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2389         if (!br->mcast_stats)
2390                 return -ENOMEM;
2391
2392         return 0;
2393 }
2394
2395 void br_multicast_uninit_stats(struct net_bridge *br)
2396 {
2397         free_percpu(br->mcast_stats);
2398 }
2399
2400 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2401 {
2402         dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2403         dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2404 }
2405
2406 void br_multicast_get_stats(const struct net_bridge *br,
2407                             const struct net_bridge_port *p,
2408                             struct br_mcast_stats *dest)
2409 {
2410         struct bridge_mcast_stats __percpu *stats;
2411         struct br_mcast_stats tdst;
2412         int i;
2413
2414         memset(dest, 0, sizeof(*dest));
2415         if (p)
2416                 stats = p->mcast_stats;
2417         else
2418                 stats = br->mcast_stats;
2419         if (WARN_ON(!stats))
2420                 return;
2421
2422         memset(&tdst, 0, sizeof(tdst));
2423         for_each_possible_cpu(i) {
2424                 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2425                 struct br_mcast_stats temp;
2426                 unsigned int start;
2427
2428                 do {
2429                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2430                         memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2431                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2432
2433                 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2434                 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2435                 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2436                 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2437                 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2438                 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2439                 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2440                 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2441
2442                 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2443                 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2444                 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2445                 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2446                 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2447                 tdst.mld_parse_errors += temp.mld_parse_errors;
2448         }
2449         memcpy(dest, &tdst, sizeof(*dest));
2450 }
2451
2452 int br_mdb_hash_init(struct net_bridge *br)
2453 {
2454         return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
2455 }
2456
2457 void br_mdb_hash_fini(struct net_bridge *br)
2458 {
2459         rhashtable_destroy(&br->mdb_hash_tbl);
2460 }