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 #include <trace/events/bridge.h>
  35
  36 #include "br_private.h"
  37 #include "br_private_mcast_eht.h"
  38
  39 static const struct rhashtable_params br_mdb_rht_params = {
  40         .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode),
  41         .key_offset = offsetof(struct net_bridge_mdb_entry, addr),
  42         .key_len = sizeof(struct br_ip),
  43         .automatic_shrinking = true,
  44 };
  45
  46 static const struct rhashtable_params br_sg_port_rht_params = {
  47         .head_offset = offsetof(struct net_bridge_port_group, rhnode),
  48         .key_offset = offsetof(struct net_bridge_port_group, key),
  49         .key_len = sizeof(struct net_bridge_port_group_sg_key),
  50         .automatic_shrinking = true,
  51 };
  52
  53 static void br_multicast_start_querier(struct net_bridge_mcast *brmctx,
  54                                        struct bridge_mcast_own_query *query);
  55 static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx,
  56                                         struct net_bridge_mcast_port *pmctx);
  57 static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx,
  58                                          struct net_bridge_mcast_port *pmctx,
  59                                          __be32 group,
  60                                          __u16 vid,
  61                                          const unsigned char *src);
  62 static void br_multicast_port_group_rexmit(struct timer_list *t);
  63
  64 static void
  65 br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted);
  66 static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx,
  67                                         struct net_bridge_mcast_port *pmctx);
  68 #if IS_ENABLED(CONFIG_IPV6)
  69 static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx,
  70                                          struct net_bridge_mcast_port *pmctx,
  71                                          const struct in6_addr *group,
  72                                          __u16 vid, const unsigned char *src);
  73 #endif
  74 static struct net_bridge_port_group *
  75 __br_multicast_add_group(struct net_bridge_mcast *brmctx,
  76                          struct net_bridge_mcast_port *pmctx,
  77                          struct br_ip *group,
  78                          const unsigned char *src,
  79                          u8 filter_mode,
  80                          bool igmpv2_mldv1,
  81                          bool blocked);
  82 static void br_multicast_find_del_pg(struct net_bridge *br,
  83                                      struct net_bridge_port_group *pg);
  84 static void __br_multicast_stop(struct net_bridge_mcast *brmctx);
  85
  86 static int br_mc_disabled_update(struct net_device *dev, bool value,
  87                                  struct netlink_ext_ack *extack);
  88
  89 static struct net_bridge_port_group *
  90 br_sg_port_find(struct net_bridge *br,
  91                 struct net_bridge_port_group_sg_key *sg_p)
  92 {
  93         lockdep_assert_held_once(&br->multicast_lock);
  94
  95         return rhashtable_lookup_fast(&br->sg_port_tbl, sg_p,
  96                                       br_sg_port_rht_params);
  97 }
  98
  99 static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
 100                                                       struct br_ip *dst)
 101 {
 102         return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
 103 }
 104
 105 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
 106                                            struct br_ip *dst)
 107 {
 108         struct net_bridge_mdb_entry *ent;
 109
 110         lockdep_assert_held_once(&br->multicast_lock);
 111
 112         rcu_read_lock();
 113         ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
 114         rcu_read_unlock();
 115
 116         return ent;
 117 }
 118
 119 static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
 120                                                    __be32 dst, __u16 vid)
 121 {
 122         struct br_ip br_dst;
 123
 124         memset(&br_dst, 0, sizeof(br_dst));
 125         br_dst.dst.ip4 = dst;
 126         br_dst.proto = htons(ETH_P_IP);
 127         br_dst.vid = vid;
 128
 129         return br_mdb_ip_get(br, &br_dst);
 130 }
 131
 132 #if IS_ENABLED(CONFIG_IPV6)
 133 static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
 134                                                    const struct in6_addr *dst,
 135                                                    __u16 vid)
 136 {
 137         struct br_ip br_dst;
 138
 139         memset(&br_dst, 0, sizeof(br_dst));
 140         br_dst.dst.ip6 = *dst;
 141         br_dst.proto = htons(ETH_P_IPV6);
 142         br_dst.vid = vid;
 143
 144         return br_mdb_ip_get(br, &br_dst);
 145 }
 146 #endif
 147
 148 struct net_bridge_mdb_entry *
 149 br_mdb_entry_skb_get(struct net_bridge_mcast *brmctx, struct sk_buff *skb,
 150                      u16 vid)
 151 {
 152         struct net_bridge *br = brmctx->br;
 153         struct br_ip ip;
 154
 155         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
 156             br_multicast_ctx_vlan_global_disabled(brmctx))
 157                 return NULL;
 158
 159         if (BR_INPUT_SKB_CB(skb)->igmp)
 160                 return NULL;
 161
 162         memset(&ip, 0, sizeof(ip));
 163         ip.proto = skb->protocol;
 164         ip.vid = vid;
 165
 166         switch (skb->protocol) {
 167         case htons(ETH_P_IP):
 168                 ip.dst.ip4 = ip_hdr(skb)->daddr;
 169                 if (brmctx->multicast_igmp_version == 3) {
 170                         struct net_bridge_mdb_entry *mdb;
 171
 172                         ip.src.ip4 = ip_hdr(skb)->saddr;
 173                         mdb = br_mdb_ip_get_rcu(br, &ip);
 174                         if (mdb)
 175                                 return mdb;
 176                         ip.src.ip4 = 0;
 177                 }
 178                 break;
 179 #if IS_ENABLED(CONFIG_IPV6)
 180         case htons(ETH_P_IPV6):
 181                 ip.dst.ip6 = ipv6_hdr(skb)->daddr;
 182                 if (brmctx->multicast_mld_version == 2) {
 183                         struct net_bridge_mdb_entry *mdb;
 184
 185                         ip.src.ip6 = ipv6_hdr(skb)->saddr;
 186                         mdb = br_mdb_ip_get_rcu(br, &ip);
 187                         if (mdb)
 188                                 return mdb;
 189                         memset(&ip.src.ip6, 0, sizeof(ip.src.ip6));
 190                 }
 191                 break;
 192 #endif
 193         default:
 194                 ip.proto = 0;
 195                 ether_addr_copy(ip.dst.mac_addr, eth_hdr(skb)->h_dest);
 196         }
 197
 198         return br_mdb_ip_get_rcu(br, &ip);
 199 }
 200
 201 /* IMPORTANT: this function must be used only when the contexts cannot be
 202  * passed down (e.g. timer) and must be used for read-only purposes because
 203  * the vlan snooping option can change, so it can return any context
 204  * (non-vlan or vlan). Its initial intended purpose is to read timer values
 205  * from the *current* context based on the option. At worst that could lead
 206  * to inconsistent timers when the contexts are changed, i.e. src timer
 207  * which needs to re-arm with a specific delay taken from the old context
 208  */
 209 static struct net_bridge_mcast_port *
 210 br_multicast_pg_to_port_ctx(const struct net_bridge_port_group *pg)
 211 {
 212         struct net_bridge_mcast_port *pmctx = &pg->key.port->multicast_ctx;
 213         struct net_bridge_vlan *vlan;
 214
 215         lockdep_assert_held_once(&pg->key.port->br->multicast_lock);
 216
 217         /* if vlan snooping is disabled use the port's multicast context */
 218         if (!pg->key.addr.vid ||
 219             !br_opt_get(pg->key.port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED))
 220                 goto out;
 221
 222         /* locking is tricky here, due to different rules for multicast and
 223          * vlans we need to take rcu to find the vlan and make sure it has
 224          * the BR_VLFLAG_MCAST_ENABLED flag set, it can only change under
 225          * multicast_lock which must be already held here, so the vlan's pmctx
 226          * can safely be used on return
 227          */
 228         rcu_read_lock();
 229         vlan = br_vlan_find(nbp_vlan_group_rcu(pg->key.port), pg->key.addr.vid);
 230         if (vlan && !br_multicast_port_ctx_vlan_disabled(&vlan->port_mcast_ctx))
 231                 pmctx = &vlan->port_mcast_ctx;
 232         else
 233                 pmctx = NULL;
 234         rcu_read_unlock();
 235 out:
 236         return pmctx;
 237 }
 238
 239 static struct net_bridge_mcast_port *
 240 br_multicast_port_vid_to_port_ctx(struct net_bridge_port *port, u16 vid)
 241 {
 242         struct net_bridge_mcast_port *pmctx = NULL;
 243         struct net_bridge_vlan *vlan;
 244
 245         lockdep_assert_held_once(&port->br->multicast_lock);
 246
 247         if (!br_opt_get(port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED))
 248                 return NULL;
 249
 250         /* Take RCU to access the vlan. */
 251         rcu_read_lock();
 252
 253         vlan = br_vlan_find(nbp_vlan_group_rcu(port), vid);
 254         if (vlan && !br_multicast_port_ctx_vlan_disabled(&vlan->port_mcast_ctx))
 255                 pmctx = &vlan->port_mcast_ctx;
 256
 257         rcu_read_unlock();
 258
 259         return pmctx;
 260 }
 261
 262 /* when snooping we need to check if the contexts should be used
 263  * in the following order:
 264  * - if pmctx is non-NULL (port), check if it should be used
 265  * - if pmctx is NULL (bridge), check if brmctx should be used
 266  */
 267 static bool
 268 br_multicast_ctx_should_use(const struct net_bridge_mcast *brmctx,
 269                             const struct net_bridge_mcast_port *pmctx)
 270 {
 271         if (!netif_running(brmctx->br->dev))
 272                 return false;
 273
 274         if (pmctx)
 275                 return !br_multicast_port_ctx_state_disabled(pmctx);
 276         else
 277                 return !br_multicast_ctx_vlan_disabled(brmctx);
 278 }
 279
 280 static bool br_port_group_equal(struct net_bridge_port_group *p,
 281                                 struct net_bridge_port *port,
 282                                 const unsigned char *src)
 283 {
 284         if (p->key.port != port)
 285                 return false;
 286
 287         if (!(port->flags & BR_MULTICAST_TO_UNICAST))
 288                 return true;
 289
 290         return ether_addr_equal(src, p->eth_addr);
 291 }
 292
 293 static void __fwd_add_star_excl(struct net_bridge_mcast_port *pmctx,
 294                                 struct net_bridge_port_group *pg,
 295                                 struct br_ip *sg_ip)
 296 {
 297         struct net_bridge_port_group_sg_key sg_key;
 298         struct net_bridge_port_group *src_pg;
 299         struct net_bridge_mcast *brmctx;
 300
 301         memset(&sg_key, 0, sizeof(sg_key));
 302         brmctx = br_multicast_port_ctx_get_global(pmctx);
 303         sg_key.port = pg->key.port;
 304         sg_key.addr = *sg_ip;
 305         if (br_sg_port_find(brmctx->br, &sg_key))
 306                 return;
 307
 308         src_pg = __br_multicast_add_group(brmctx, pmctx,
 309                                           sg_ip, pg->eth_addr,
 310                                           MCAST_INCLUDE, false, false);
 311         if (IS_ERR_OR_NULL(src_pg) ||
 312             src_pg->rt_protocol != RTPROT_KERNEL)
 313                 return;
 314
 315         src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
 316 }
 317
 318 static void __fwd_del_star_excl(struct net_bridge_port_group *pg,
 319                                 struct br_ip *sg_ip)
 320 {
 321         struct net_bridge_port_group_sg_key sg_key;
 322         struct net_bridge *br = pg->key.port->br;
 323         struct net_bridge_port_group *src_pg;
 324
 325         memset(&sg_key, 0, sizeof(sg_key));
 326         sg_key.port = pg->key.port;
 327         sg_key.addr = *sg_ip;
 328         src_pg = br_sg_port_find(br, &sg_key);
 329         if (!src_pg || !(src_pg->flags & MDB_PG_FLAGS_STAR_EXCL) ||
 330             src_pg->rt_protocol != RTPROT_KERNEL)
 331                 return;
 332
 333         br_multicast_find_del_pg(br, src_pg);
 334 }
 335
 336 /* When a port group transitions to (or is added as) EXCLUDE we need to add it
 337  * to all other ports' S,G entries which are not blocked by the current group
 338  * for proper replication, the assumption is that any S,G blocked entries
 339  * are already added so the S,G,port lookup should skip them.
 340  * When a port group transitions from EXCLUDE -> INCLUDE mode or is being
 341  * deleted we need to remove it from all ports' S,G entries where it was
 342  * automatically installed before (i.e. where it's MDB_PG_FLAGS_STAR_EXCL).
 343  */
 344 void br_multicast_star_g_handle_mode(struct net_bridge_port_group *pg,
 345                                      u8 filter_mode)
 346 {
 347         struct net_bridge *br = pg->key.port->br;
 348         struct net_bridge_port_group *pg_lst;
 349         struct net_bridge_mcast_port *pmctx;
 350         struct net_bridge_mdb_entry *mp;
 351         struct br_ip sg_ip;
 352
 353         if (WARN_ON(!br_multicast_is_star_g(&pg->key.addr)))
 354                 return;
 355
 356         mp = br_mdb_ip_get(br, &pg->key.addr);
 357         if (!mp)
 358                 return;
 359         pmctx = br_multicast_pg_to_port_ctx(pg);
 360         if (!pmctx)
 361                 return;
 362
 363         memset(&sg_ip, 0, sizeof(sg_ip));
 364         sg_ip = pg->key.addr;
 365
 366         for (pg_lst = mlock_dereference(mp->ports, br);
 367              pg_lst;
 368              pg_lst = mlock_dereference(pg_lst->next, br)) {
 369                 struct net_bridge_group_src *src_ent;
 370
 371                 if (pg_lst == pg)
 372                         continue;
 373                 hlist_for_each_entry(src_ent, &pg_lst->src_list, node) {
 374                         if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
 375                                 continue;
 376                         sg_ip.src = src_ent->addr.src;
 377                         switch (filter_mode) {
 378                         case MCAST_INCLUDE:
 379                                 __fwd_del_star_excl(pg, &sg_ip);
 380                                 break;
 381                         case MCAST_EXCLUDE:
 382                                 __fwd_add_star_excl(pmctx, pg, &sg_ip);
 383                                 break;
 384                         }
 385                 }
 386         }
 387 }
 388
 389 /* called when adding a new S,G with host_joined == false by default */
 390 static void br_multicast_sg_host_state(struct net_bridge_mdb_entry *star_mp,
 391                                        struct net_bridge_port_group *sg)
 392 {
 393         struct net_bridge_mdb_entry *sg_mp;
 394
 395         if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
 396                 return;
 397         if (!star_mp->host_joined)
 398                 return;
 399
 400         sg_mp = br_mdb_ip_get(star_mp->br, &sg->key.addr);
 401         if (!sg_mp)
 402                 return;
 403         sg_mp->host_joined = true;
 404 }
 405
 406 /* set the host_joined state of all of *,G's S,G entries */
 407 static void br_multicast_star_g_host_state(struct net_bridge_mdb_entry *star_mp)
 408 {
 409         struct net_bridge *br = star_mp->br;
 410         struct net_bridge_mdb_entry *sg_mp;
 411         struct net_bridge_port_group *pg;
 412         struct br_ip sg_ip;
 413
 414         if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
 415                 return;
 416
 417         memset(&sg_ip, 0, sizeof(sg_ip));
 418         sg_ip = star_mp->addr;
 419         for (pg = mlock_dereference(star_mp->ports, br);
 420              pg;
 421              pg = mlock_dereference(pg->next, br)) {
 422                 struct net_bridge_group_src *src_ent;
 423
 424                 hlist_for_each_entry(src_ent, &pg->src_list, node) {
 425                         if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
 426                                 continue;
 427                         sg_ip.src = src_ent->addr.src;
 428                         sg_mp = br_mdb_ip_get(br, &sg_ip);
 429                         if (!sg_mp)
 430                                 continue;
 431                         sg_mp->host_joined = star_mp->host_joined;
 432                 }
 433         }
 434 }
 435
 436 static void br_multicast_sg_del_exclude_ports(struct net_bridge_mdb_entry *sgmp)
 437 {
 438         struct net_bridge_port_group __rcu **pp;
 439         struct net_bridge_port_group *p;
 440
 441         /* *,G exclude ports are only added to S,G entries */
 442         if (WARN_ON(br_multicast_is_star_g(&sgmp->addr)))
 443                 return;
 444
 445         /* we need the STAR_EXCLUDE ports if there are non-STAR_EXCLUDE ports
 446          * we should ignore perm entries since they're managed by user-space
 447          */
 448         for (pp = &sgmp->ports;
 449              (p = mlock_dereference(*pp, sgmp->br)) != NULL;
 450              pp = &p->next)
 451                 if (!(p->flags & (MDB_PG_FLAGS_STAR_EXCL |
 452                                   MDB_PG_FLAGS_PERMANENT)))
 453                         return;
 454
 455         /* currently the host can only have joined the *,G which means
 456          * we treat it as EXCLUDE {}, so for an S,G it's considered a
 457          * STAR_EXCLUDE entry and we can safely leave it
 458          */
 459         sgmp->host_joined = false;
 460
 461         for (pp = &sgmp->ports;
 462              (p = mlock_dereference(*pp, sgmp->br)) != NULL;) {
 463                 if (!(p->flags & MDB_PG_FLAGS_PERMANENT))
 464                         br_multicast_del_pg(sgmp, p, pp);
 465                 else
 466                         pp = &p->next;
 467         }
 468 }
 469
 470 void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp,
 471                                        struct net_bridge_port_group *sg)
 472 {
 473         struct net_bridge_port_group_sg_key sg_key;
 474         struct net_bridge *br = star_mp->br;
 475         struct net_bridge_mcast_port *pmctx;
 476         struct net_bridge_port_group *pg;
 477         struct net_bridge_mcast *brmctx;
 478
 479         if (WARN_ON(br_multicast_is_star_g(&sg->key.addr)))
 480                 return;
 481         if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
 482                 return;
 483
 484         br_multicast_sg_host_state(star_mp, sg);
 485         memset(&sg_key, 0, sizeof(sg_key));
 486         sg_key.addr = sg->key.addr;
 487         /* we need to add all exclude ports to the S,G */
 488         for (pg = mlock_dereference(star_mp->ports, br);
 489              pg;
 490              pg = mlock_dereference(pg->next, br)) {
 491                 struct net_bridge_port_group *src_pg;
 492
 493                 if (pg == sg || pg->filter_mode == MCAST_INCLUDE)
 494                         continue;
 495
 496                 sg_key.port = pg->key.port;
 497                 if (br_sg_port_find(br, &sg_key))
 498                         continue;
 499
 500                 pmctx = br_multicast_pg_to_port_ctx(pg);
 501                 if (!pmctx)
 502                         continue;
 503                 brmctx = br_multicast_port_ctx_get_global(pmctx);
 504
 505                 src_pg = __br_multicast_add_group(brmctx, pmctx,
 506                                                   &sg->key.addr,
 507                                                   sg->eth_addr,
 508                                                   MCAST_INCLUDE, false, false);
 509                 if (IS_ERR_OR_NULL(src_pg) ||
 510                     src_pg->rt_protocol != RTPROT_KERNEL)
 511                         continue;
 512                 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
 513         }
 514 }
 515
 516 static void br_multicast_fwd_src_add(struct net_bridge_group_src *src)
 517 {
 518         struct net_bridge_mdb_entry *star_mp;
 519         struct net_bridge_mcast_port *pmctx;
 520         struct net_bridge_port_group *sg;
 521         struct net_bridge_mcast *brmctx;
 522         struct br_ip sg_ip;
 523
 524         if (src->flags & BR_SGRP_F_INSTALLED)
 525                 return;
 526
 527         memset(&sg_ip, 0, sizeof(sg_ip));
 528         pmctx = br_multicast_pg_to_port_ctx(src->pg);
 529         if (!pmctx)
 530                 return;
 531         brmctx = br_multicast_port_ctx_get_global(pmctx);
 532         sg_ip = src->pg->key.addr;
 533         sg_ip.src = src->addr.src;
 534
 535         sg = __br_multicast_add_group(brmctx, pmctx, &sg_ip,
 536                                       src->pg->eth_addr, MCAST_INCLUDE, false,
 537                                       !timer_pending(&src->timer));
 538         if (IS_ERR_OR_NULL(sg))
 539                 return;
 540         src->flags |= BR_SGRP_F_INSTALLED;
 541         sg->flags &= ~MDB_PG_FLAGS_STAR_EXCL;
 542
 543         /* if it was added by user-space as perm we can skip next steps */
 544         if (sg->rt_protocol != RTPROT_KERNEL &&
 545             (sg->flags & MDB_PG_FLAGS_PERMANENT))
 546                 return;
 547
 548         /* the kernel is now responsible for removing this S,G */
 549         del_timer(&sg->timer);
 550         star_mp = br_mdb_ip_get(src->br, &src->pg->key.addr);
 551         if (!star_mp)
 552                 return;
 553
 554         br_multicast_sg_add_exclude_ports(star_mp, sg);
 555 }
 556
 557 static void br_multicast_fwd_src_remove(struct net_bridge_group_src *src,
 558                                         bool fastleave)
 559 {
 560         struct net_bridge_port_group *p, *pg = src->pg;
 561         struct net_bridge_port_group __rcu **pp;
 562         struct net_bridge_mdb_entry *mp;
 563         struct br_ip sg_ip;
 564
 565         memset(&sg_ip, 0, sizeof(sg_ip));
 566         sg_ip = pg->key.addr;
 567         sg_ip.src = src->addr.src;
 568
 569         mp = br_mdb_ip_get(src->br, &sg_ip);
 570         if (!mp)
 571                 return;
 572
 573         for (pp = &mp->ports;
 574              (p = mlock_dereference(*pp, src->br)) != NULL;
 575              pp = &p->next) {
 576                 if (!br_port_group_equal(p, pg->key.port, pg->eth_addr))
 577                         continue;
 578
 579                 if (p->rt_protocol != RTPROT_KERNEL &&
 580                     (p->flags & MDB_PG_FLAGS_PERMANENT) &&
 581                     !(src->flags & BR_SGRP_F_USER_ADDED))
 582                         break;
 583
 584                 if (fastleave)
 585                         p->flags |= MDB_PG_FLAGS_FAST_LEAVE;
 586                 br_multicast_del_pg(mp, p, pp);
 587                 break;
 588         }
 589         src->flags &= ~BR_SGRP_F_INSTALLED;
 590 }
 591
 592 /* install S,G and based on src's timer enable or disable forwarding */
 593 static void br_multicast_fwd_src_handle(struct net_bridge_group_src *src)
 594 {
 595         struct net_bridge_port_group_sg_key sg_key;
 596         struct net_bridge_port_group *sg;
 597         u8 old_flags;
 598
 599         br_multicast_fwd_src_add(src);
 600
 601         memset(&sg_key, 0, sizeof(sg_key));
 602         sg_key.addr = src->pg->key.addr;
 603         sg_key.addr.src = src->addr.src;
 604         sg_key.port = src->pg->key.port;
 605
 606         sg = br_sg_port_find(src->br, &sg_key);
 607         if (!sg || (sg->flags & MDB_PG_FLAGS_PERMANENT))
 608                 return;
 609
 610         old_flags = sg->flags;
 611         if (timer_pending(&src->timer))
 612                 sg->flags &= ~MDB_PG_FLAGS_BLOCKED;
 613         else
 614                 sg->flags |= MDB_PG_FLAGS_BLOCKED;
 615
 616         if (old_flags != sg->flags) {
 617                 struct net_bridge_mdb_entry *sg_mp;
 618
 619                 sg_mp = br_mdb_ip_get(src->br, &sg_key.addr);
 620                 if (!sg_mp)
 621                         return;
 622                 br_mdb_notify(src->br->dev, sg_mp, sg, RTM_NEWMDB);
 623         }
 624 }
 625
 626 static void br_multicast_destroy_mdb_entry(struct net_bridge_mcast_gc *gc)
 627 {
 628         struct net_bridge_mdb_entry *mp;
 629
 630         mp = container_of(gc, struct net_bridge_mdb_entry, mcast_gc);
 631         WARN_ON(!hlist_unhashed(&mp->mdb_node));
 632         WARN_ON(mp->ports);
 633
 634         timer_shutdown_sync(&mp->timer);
 635         kfree_rcu(mp, rcu);
 636 }
 637
 638 static void br_multicast_del_mdb_entry(struct net_bridge_mdb_entry *mp)
 639 {
 640         struct net_bridge *br = mp->br;
 641
 642         rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
 643                                br_mdb_rht_params);
 644         hlist_del_init_rcu(&mp->mdb_node);
 645         hlist_add_head(&mp->mcast_gc.gc_node, &br->mcast_gc_list);
 646         queue_work(system_long_wq, &br->mcast_gc_work);
 647 }
 648
 649 static void br_multicast_group_expired(struct timer_list *t)
 650 {
 651         struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
 652         struct net_bridge *br = mp->br;
 653
 654         spin_lock(&br->multicast_lock);
 655         if (hlist_unhashed(&mp->mdb_node) || !netif_running(br->dev) ||
 656             timer_pending(&mp->timer))
 657                 goto out;
 658
 659         br_multicast_host_leave(mp, true);
 660
 661         if (mp->ports)
 662                 goto out;
 663         br_multicast_del_mdb_entry(mp);
 664 out:
 665         spin_unlock(&br->multicast_lock);
 666 }
 667
 668 static void br_multicast_destroy_group_src(struct net_bridge_mcast_gc *gc)
 669 {
 670         struct net_bridge_group_src *src;
 671
 672         src = container_of(gc, struct net_bridge_group_src, mcast_gc);
 673         WARN_ON(!hlist_unhashed(&src->node));
 674
 675         timer_shutdown_sync(&src->timer);
 676         kfree_rcu(src, rcu);
 677 }
 678
 679 void __br_multicast_del_group_src(struct net_bridge_group_src *src)
 680 {
 681         struct net_bridge *br = src->pg->key.port->br;
 682
 683         hlist_del_init_rcu(&src->node);
 684         src->pg->src_ents--;
 685         hlist_add_head(&src->mcast_gc.gc_node, &br->mcast_gc_list);
 686         queue_work(system_long_wq, &br->mcast_gc_work);
 687 }
 688
 689 void br_multicast_del_group_src(struct net_bridge_group_src *src,
 690                                 bool fastleave)
 691 {
 692         br_multicast_fwd_src_remove(src, fastleave);
 693         __br_multicast_del_group_src(src);
 694 }
 695
 696 static int
 697 br_multicast_port_ngroups_inc_one(struct net_bridge_mcast_port *pmctx,
 698                                   struct netlink_ext_ack *extack,
 699                                   const char *what)
 700 {
 701         u32 max = READ_ONCE(pmctx->mdb_max_entries);
 702         u32 n = READ_ONCE(pmctx->mdb_n_entries);
 703
 704         if (max && n >= max) {
 705                 NL_SET_ERR_MSG_FMT_MOD(extack, "%s is already in %u groups, and mcast_max_groups=%u",
 706                                        what, n, max);
 707                 return -E2BIG;
 708         }
 709
 710         WRITE_ONCE(pmctx->mdb_n_entries, n + 1);
 711         return 0;
 712 }
 713
 714 static void br_multicast_port_ngroups_dec_one(struct net_bridge_mcast_port *pmctx)
 715 {
 716         u32 n = READ_ONCE(pmctx->mdb_n_entries);
 717
 718         WARN_ON_ONCE(n == 0);
 719         WRITE_ONCE(pmctx->mdb_n_entries, n - 1);
 720 }
 721
 722 static int br_multicast_port_ngroups_inc(struct net_bridge_port *port,
 723                                          const struct br_ip *group,
 724                                          struct netlink_ext_ack *extack)
 725 {
 726         struct net_bridge_mcast_port *pmctx;
 727         int err;
 728
 729         lockdep_assert_held_once(&port->br->multicast_lock);
 730
 731         /* Always count on the port context. */
 732         err = br_multicast_port_ngroups_inc_one(&port->multicast_ctx, extack,
 733                                                 "Port");
 734         if (err) {
 735                 trace_br_mdb_full(port->dev, group);
 736                 return err;
 737         }
 738
 739         /* Only count on the VLAN context if VID is given, and if snooping on
 740          * that VLAN is enabled.
 741          */
 742         if (!group->vid)
 743                 return 0;
 744
 745         pmctx = br_multicast_port_vid_to_port_ctx(port, group->vid);
 746         if (!pmctx)
 747                 return 0;
 748
 749         err = br_multicast_port_ngroups_inc_one(pmctx, extack, "Port-VLAN");
 750         if (err) {
 751                 trace_br_mdb_full(port->dev, group);
 752                 goto dec_one_out;
 753         }
 754
 755         return 0;
 756
 757 dec_one_out:
 758         br_multicast_port_ngroups_dec_one(&port->multicast_ctx);
 759         return err;
 760 }
 761
 762 static void br_multicast_port_ngroups_dec(struct net_bridge_port *port, u16 vid)
 763 {
 764         struct net_bridge_mcast_port *pmctx;
 765
 766         lockdep_assert_held_once(&port->br->multicast_lock);
 767
 768         if (vid) {
 769                 pmctx = br_multicast_port_vid_to_port_ctx(port, vid);
 770                 if (pmctx)
 771                         br_multicast_port_ngroups_dec_one(pmctx);
 772         }
 773         br_multicast_port_ngroups_dec_one(&port->multicast_ctx);
 774 }
 775
 776 u32 br_multicast_ngroups_get(const struct net_bridge_mcast_port *pmctx)
 777 {
 778         return READ_ONCE(pmctx->mdb_n_entries);
 779 }
 780
 781 void br_multicast_ngroups_set_max(struct net_bridge_mcast_port *pmctx, u32 max)
 782 {
 783         WRITE_ONCE(pmctx->mdb_max_entries, max);
 784 }
 785
 786 u32 br_multicast_ngroups_get_max(const struct net_bridge_mcast_port *pmctx)
 787 {
 788         return READ_ONCE(pmctx->mdb_max_entries);
 789 }
 790
 791 static void br_multicast_destroy_port_group(struct net_bridge_mcast_gc *gc)
 792 {
 793         struct net_bridge_port_group *pg;
 794
 795         pg = container_of(gc, struct net_bridge_port_group, mcast_gc);
 796         WARN_ON(!hlist_unhashed(&pg->mglist));
 797         WARN_ON(!hlist_empty(&pg->src_list));
 798
 799         timer_shutdown_sync(&pg->rexmit_timer);
 800         timer_shutdown_sync(&pg->timer);
 801         kfree_rcu(pg, rcu);
 802 }
 803
 804 void br_multicast_del_pg(struct net_bridge_mdb_entry *mp,
 805                          struct net_bridge_port_group *pg,
 806                          struct net_bridge_port_group __rcu **pp)
 807 {
 808         struct net_bridge *br = pg->key.port->br;
 809         struct net_bridge_group_src *ent;
 810         struct hlist_node *tmp;
 811
 812         rcu_assign_pointer(*pp, pg->next);
 813         hlist_del_init(&pg->mglist);
 814         br_multicast_eht_clean_sets(pg);
 815         hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
 816                 br_multicast_del_group_src(ent, false);
 817         br_mdb_notify(br->dev, mp, pg, RTM_DELMDB);
 818         if (!br_multicast_is_star_g(&mp->addr)) {
 819                 rhashtable_remove_fast(&br->sg_port_tbl, &pg->rhnode,
 820                                        br_sg_port_rht_params);
 821                 br_multicast_sg_del_exclude_ports(mp);
 822         } else {
 823                 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
 824         }
 825         br_multicast_port_ngroups_dec(pg->key.port, pg->key.addr.vid);
 826         hlist_add_head(&pg->mcast_gc.gc_node, &br->mcast_gc_list);
 827         queue_work(system_long_wq, &br->mcast_gc_work);
 828
 829         if (!mp->ports && !mp->host_joined && netif_running(br->dev))
 830                 mod_timer(&mp->timer, jiffies);
 831 }
 832
 833 static void br_multicast_find_del_pg(struct net_bridge *br,
 834                                      struct net_bridge_port_group *pg)
 835 {
 836         struct net_bridge_port_group __rcu **pp;
 837         struct net_bridge_mdb_entry *mp;
 838         struct net_bridge_port_group *p;
 839
 840         mp = br_mdb_ip_get(br, &pg->key.addr);
 841         if (WARN_ON(!mp))
 842                 return;
 843
 844         for (pp = &mp->ports;
 845              (p = mlock_dereference(*pp, br)) != NULL;
 846              pp = &p->next) {
 847                 if (p != pg)
 848                         continue;
 849
 850                 br_multicast_del_pg(mp, pg, pp);
 851                 return;
 852         }
 853
 854         WARN_ON(1);
 855 }
 856
 857 static void br_multicast_port_group_expired(struct timer_list *t)
 858 {
 859         struct net_bridge_port_group *pg = from_timer(pg, t, timer);
 860         struct net_bridge_group_src *src_ent;
 861         struct net_bridge *br = pg->key.port->br;
 862         struct hlist_node *tmp;
 863         bool changed;
 864
 865         spin_lock(&br->multicast_lock);
 866         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
 867             hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
 868                 goto out;
 869
 870         changed = !!(pg->filter_mode == MCAST_EXCLUDE);
 871         pg->filter_mode = MCAST_INCLUDE;
 872         hlist_for_each_entry_safe(src_ent, tmp, &pg->src_list, node) {
 873                 if (!timer_pending(&src_ent->timer)) {
 874                         br_multicast_del_group_src(src_ent, false);
 875                         changed = true;
 876                 }
 877         }
 878
 879         if (hlist_empty(&pg->src_list)) {
 880                 br_multicast_find_del_pg(br, pg);
 881         } else if (changed) {
 882                 struct net_bridge_mdb_entry *mp = br_mdb_ip_get(br, &pg->key.addr);
 883
 884                 if (changed && br_multicast_is_star_g(&pg->key.addr))
 885                         br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
 886
 887                 if (WARN_ON(!mp))
 888                         goto out;
 889                 br_mdb_notify(br->dev, mp, pg, RTM_NEWMDB);
 890         }
 891 out:
 892         spin_unlock(&br->multicast_lock);
 893 }
 894
 895 static void br_multicast_gc(struct hlist_head *head)
 896 {
 897         struct net_bridge_mcast_gc *gcent;
 898         struct hlist_node *tmp;
 899
 900         hlist_for_each_entry_safe(gcent, tmp, head, gc_node) {
 901                 hlist_del_init(&gcent->gc_node);
 902                 gcent->destroy(gcent);
 903         }
 904 }
 905
 906 static void __br_multicast_query_handle_vlan(struct net_bridge_mcast *brmctx,
 907                                              struct net_bridge_mcast_port *pmctx,
 908                                              struct sk_buff *skb)
 909 {
 910         struct net_bridge_vlan *vlan = NULL;
 911
 912         if (pmctx && br_multicast_port_ctx_is_vlan(pmctx))
 913                 vlan = pmctx->vlan;
 914         else if (br_multicast_ctx_is_vlan(brmctx))
 915                 vlan = brmctx->vlan;
 916
 917         if (vlan && !(vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED)) {
 918                 u16 vlan_proto;
 919
 920                 if (br_vlan_get_proto(brmctx->br->dev, &vlan_proto) != 0)
 921                         return;
 922                 __vlan_hwaccel_put_tag(skb, htons(vlan_proto), vlan->vid);
 923         }
 924 }
 925
 926 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge_mcast *brmctx,
 927                                                     struct net_bridge_mcast_port *pmctx,
 928                                                     struct net_bridge_port_group *pg,
 929                                                     __be32 ip_dst, __be32 group,
 930                                                     bool with_srcs, bool over_lmqt,
 931                                                     u8 sflag, u8 *igmp_type,
 932                                                     bool *need_rexmit)
 933 {
 934         struct net_bridge_port *p = pg ? pg->key.port : NULL;
 935         struct net_bridge_group_src *ent;
 936         size_t pkt_size, igmp_hdr_size;
 937         unsigned long now = jiffies;
 938         struct igmpv3_query *ihv3;
 939         void *csum_start = NULL;
 940         __sum16 *csum = NULL;
 941         struct sk_buff *skb;
 942         struct igmphdr *ih;
 943         struct ethhdr *eth;
 944         unsigned long lmqt;
 945         struct iphdr *iph;
 946         u16 lmqt_srcs = 0;
 947
 948         igmp_hdr_size = sizeof(*ih);
 949         if (brmctx->multicast_igmp_version == 3) {
 950                 igmp_hdr_size = sizeof(*ihv3);
 951                 if (pg && with_srcs) {
 952                         lmqt = now + (brmctx->multicast_last_member_interval *
 953                                       brmctx->multicast_last_member_count);
 954                         hlist_for_each_entry(ent, &pg->src_list, node) {
 955                                 if (over_lmqt == time_after(ent->timer.expires,
 956                                                             lmqt) &&
 957                                     ent->src_query_rexmit_cnt > 0)
 958                                         lmqt_srcs++;
 959                         }
 960
 961                         if (!lmqt_srcs)
 962                                 return NULL;
 963                         igmp_hdr_size += lmqt_srcs * sizeof(__be32);
 964                 }
 965         }
 966
 967         pkt_size = sizeof(*eth) + sizeof(*iph) + 4 + igmp_hdr_size;
 968         if ((p && pkt_size > p->dev->mtu) ||
 969             pkt_size > brmctx->br->dev->mtu)
 970                 return NULL;
 971
 972         skb = netdev_alloc_skb_ip_align(brmctx->br->dev, pkt_size);
 973         if (!skb)
 974                 goto out;
 975
 976         __br_multicast_query_handle_vlan(brmctx, pmctx, skb);
 977         skb->protocol = htons(ETH_P_IP);
 978
 979         skb_reset_mac_header(skb);
 980         eth = eth_hdr(skb);
 981
 982         ether_addr_copy(eth->h_source, brmctx->br->dev->dev_addr);
 983         ip_eth_mc_map(ip_dst, eth->h_dest);
 984         eth->h_proto = htons(ETH_P_IP);
 985         skb_put(skb, sizeof(*eth));
 986
 987         skb_set_network_header(skb, skb->len);
 988         iph = ip_hdr(skb);
 989         iph->tot_len = htons(pkt_size - sizeof(*eth));
 990
 991         iph->version = 4;
 992         iph->ihl = 6;
 993         iph->tos = 0xc0;
 994         iph->id = 0;
 995         iph->frag_off = htons(IP_DF);
 996         iph->ttl = 1;
 997         iph->protocol = IPPROTO_IGMP;
 998         iph->saddr = br_opt_get(brmctx->br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
 999                      inet_select_addr(brmctx->br->dev, 0, RT_SCOPE_LINK) : 0;
1000         iph->daddr = ip_dst;
1001         ((u8 *)&iph[1])[0] = IPOPT_RA;
1002         ((u8 *)&iph[1])[1] = 4;
1003         ((u8 *)&iph[1])[2] = 0;
1004         ((u8 *)&iph[1])[3] = 0;
1005         ip_send_check(iph);
1006         skb_put(skb, 24);
1007
1008         skb_set_transport_header(skb, skb->len);
1009         *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
1010
1011         switch (brmctx->multicast_igmp_version) {
1012         case 2:
1013                 ih = igmp_hdr(skb);
1014                 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
1015                 ih->code = (group ? brmctx->multicast_last_member_interval :
1016                                     brmctx->multicast_query_response_interval) /
1017                            (HZ / IGMP_TIMER_SCALE);
1018                 ih->group = group;
1019                 ih->csum = 0;
1020                 csum = &ih->csum;
1021                 csum_start = (void *)ih;
1022                 break;
1023         case 3:
1024                 ihv3 = igmpv3_query_hdr(skb);
1025                 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
1026                 ihv3->code = (group ? brmctx->multicast_last_member_interval :
1027                                       brmctx->multicast_query_response_interval) /
1028                              (HZ / IGMP_TIMER_SCALE);
1029                 ihv3->group = group;
1030                 ihv3->qqic = brmctx->multicast_query_interval / HZ;
1031                 ihv3->nsrcs = htons(lmqt_srcs);
1032                 ihv3->resv = 0;
1033                 ihv3->suppress = sflag;
1034                 ihv3->qrv = 2;
1035                 ihv3->csum = 0;
1036                 csum = &ihv3->csum;
1037                 csum_start = (void *)ihv3;
1038                 if (!pg || !with_srcs)
1039                         break;
1040
1041                 lmqt_srcs = 0;
1042                 hlist_for_each_entry(ent, &pg->src_list, node) {
1043                         if (over_lmqt == time_after(ent->timer.expires,
1044                                                     lmqt) &&
1045                             ent->src_query_rexmit_cnt > 0) {
1046                                 ihv3->srcs[lmqt_srcs++] = ent->addr.src.ip4;
1047                                 ent->src_query_rexmit_cnt--;
1048                                 if (need_rexmit && ent->src_query_rexmit_cnt)
1049                                         *need_rexmit = true;
1050                         }
1051                 }
1052                 if (WARN_ON(lmqt_srcs != ntohs(ihv3->nsrcs))) {
1053                         kfree_skb(skb);
1054                         return NULL;
1055                 }
1056                 break;
1057         }
1058
1059         if (WARN_ON(!csum || !csum_start)) {
1060                 kfree_skb(skb);
1061                 return NULL;
1062         }
1063
1064         *csum = ip_compute_csum(csum_start, igmp_hdr_size);
1065         skb_put(skb, igmp_hdr_size);
1066         __skb_pull(skb, sizeof(*eth));
1067
1068 out:
1069         return skb;
1070 }
1071
1072 #if IS_ENABLED(CONFIG_IPV6)
1073 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge_mcast *brmctx,
1074                                                     struct net_bridge_mcast_port *pmctx,
1075                                                     struct net_bridge_port_group *pg,
1076                                                     const struct in6_addr *ip6_dst,
1077                                                     const struct in6_addr *group,
1078                                                     bool with_srcs, bool over_llqt,
1079                                                     u8 sflag, u8 *igmp_type,
1080                                                     bool *need_rexmit)
1081 {
1082         struct net_bridge_port *p = pg ? pg->key.port : NULL;
1083         struct net_bridge_group_src *ent;
1084         size_t pkt_size, mld_hdr_size;
1085         unsigned long now = jiffies;
1086         struct mld2_query *mld2q;
1087         void *csum_start = NULL;
1088         unsigned long interval;
1089         __sum16 *csum = NULL;
1090         struct ipv6hdr *ip6h;
1091         struct mld_msg *mldq;
1092         struct sk_buff *skb;
1093         unsigned long llqt;
1094         struct ethhdr *eth;
1095         u16 llqt_srcs = 0;
1096         u8 *hopopt;
1097
1098         mld_hdr_size = sizeof(*mldq);
1099         if (brmctx->multicast_mld_version == 2) {
1100                 mld_hdr_size = sizeof(*mld2q);
1101                 if (pg && with_srcs) {
1102                         llqt = now + (brmctx->multicast_last_member_interval *
1103                                       brmctx->multicast_last_member_count);
1104                         hlist_for_each_entry(ent, &pg->src_list, node) {
1105                                 if (over_llqt == time_after(ent->timer.expires,
1106                                                             llqt) &&
1107                                     ent->src_query_rexmit_cnt > 0)
1108                                         llqt_srcs++;
1109                         }
1110
1111                         if (!llqt_srcs)
1112                                 return NULL;
1113                         mld_hdr_size += llqt_srcs * sizeof(struct in6_addr);
1114                 }
1115         }
1116
1117         pkt_size = sizeof(*eth) + sizeof(*ip6h) + 8 + mld_hdr_size;
1118         if ((p && pkt_size > p->dev->mtu) ||
1119             pkt_size > brmctx->br->dev->mtu)
1120                 return NULL;
1121
1122         skb = netdev_alloc_skb_ip_align(brmctx->br->dev, pkt_size);
1123         if (!skb)
1124                 goto out;
1125
1126         __br_multicast_query_handle_vlan(brmctx, pmctx, skb);
1127         skb->protocol = htons(ETH_P_IPV6);
1128
1129         /* Ethernet header */
1130         skb_reset_mac_header(skb);
1131         eth = eth_hdr(skb);
1132
1133         ether_addr_copy(eth->h_source, brmctx->br->dev->dev_addr);
1134         eth->h_proto = htons(ETH_P_IPV6);
1135         skb_put(skb, sizeof(*eth));
1136
1137         /* IPv6 header + HbH option */
1138         skb_set_network_header(skb, skb->len);
1139         ip6h = ipv6_hdr(skb);
1140
1141         *(__force __be32 *)ip6h = htonl(0x60000000);
1142         ip6h->payload_len = htons(8 + mld_hdr_size);
1143         ip6h->nexthdr = IPPROTO_HOPOPTS;
1144         ip6h->hop_limit = 1;
1145         ip6h->daddr = *ip6_dst;
1146         if (ipv6_dev_get_saddr(dev_net(brmctx->br->dev), brmctx->br->dev,
1147                                &ip6h->daddr, 0, &ip6h->saddr)) {
1148                 kfree_skb(skb);
1149                 br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, false);
1150                 return NULL;
1151         }
1152
1153         br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, true);
1154         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
1155
1156         hopopt = (u8 *)(ip6h + 1);
1157         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
1158         hopopt[1] = 0;                          /* length of HbH */
1159         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
1160         hopopt[3] = 2;                          /* Length of RA Option */
1161         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
1162         hopopt[5] = 0;
1163         hopopt[6] = IPV6_TLV_PAD1;              /* Pad1 */
1164         hopopt[7] = IPV6_TLV_PAD1;              /* Pad1 */
1165
1166         skb_put(skb, sizeof(*ip6h) + 8);
1167
1168         /* ICMPv6 */
1169         skb_set_transport_header(skb, skb->len);
1170         interval = ipv6_addr_any(group) ?
1171                         brmctx->multicast_query_response_interval :
1172                         brmctx->multicast_last_member_interval;
1173         *igmp_type = ICMPV6_MGM_QUERY;
1174         switch (brmctx->multicast_mld_version) {
1175         case 1:
1176                 mldq = (struct mld_msg *)icmp6_hdr(skb);
1177                 mldq->mld_type = ICMPV6_MGM_QUERY;
1178                 mldq->mld_code = 0;
1179                 mldq->mld_cksum = 0;
1180                 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
1181                 mldq->mld_reserved = 0;
1182                 mldq->mld_mca = *group;
1183                 csum = &mldq->mld_cksum;
1184                 csum_start = (void *)mldq;
1185                 break;
1186         case 2:
1187                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1188                 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
1189                 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
1190                 mld2q->mld2q_code = 0;
1191                 mld2q->mld2q_cksum = 0;
1192                 mld2q->mld2q_resv1 = 0;
1193                 mld2q->mld2q_resv2 = 0;
1194                 mld2q->mld2q_suppress = sflag;
1195                 mld2q->mld2q_qrv = 2;
1196                 mld2q->mld2q_nsrcs = htons(llqt_srcs);
1197                 mld2q->mld2q_qqic = brmctx->multicast_query_interval / HZ;
1198                 mld2q->mld2q_mca = *group;
1199                 csum = &mld2q->mld2q_cksum;
1200                 csum_start = (void *)mld2q;
1201                 if (!pg || !with_srcs)
1202                         break;
1203
1204                 llqt_srcs = 0;
1205                 hlist_for_each_entry(ent, &pg->src_list, node) {
1206                         if (over_llqt == time_after(ent->timer.expires,
1207                                                     llqt) &&
1208                             ent->src_query_rexmit_cnt > 0) {
1209                                 mld2q->mld2q_srcs[llqt_srcs++] = ent->addr.src.ip6;
1210                                 ent->src_query_rexmit_cnt--;
1211                                 if (need_rexmit && ent->src_query_rexmit_cnt)
1212                                         *need_rexmit = true;
1213                         }
1214                 }
1215                 if (WARN_ON(llqt_srcs != ntohs(mld2q->mld2q_nsrcs))) {
1216                         kfree_skb(skb);
1217                         return NULL;
1218                 }
1219                 break;
1220         }
1221
1222         if (WARN_ON(!csum || !csum_start)) {
1223                 kfree_skb(skb);
1224                 return NULL;
1225         }
1226
1227         *csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, mld_hdr_size,
1228                                 IPPROTO_ICMPV6,
1229                                 csum_partial(csum_start, mld_hdr_size, 0));
1230         skb_put(skb, mld_hdr_size);
1231         __skb_pull(skb, sizeof(*eth));
1232
1233 out:
1234         return skb;
1235 }
1236 #endif
1237
1238 static struct sk_buff *br_multicast_alloc_query(struct net_bridge_mcast *brmctx,
1239                                                 struct net_bridge_mcast_port *pmctx,
1240                                                 struct net_bridge_port_group *pg,
1241                                                 struct br_ip *ip_dst,
1242                                                 struct br_ip *group,
1243                                                 bool with_srcs, bool over_lmqt,
1244                                                 u8 sflag, u8 *igmp_type,
1245                                                 bool *need_rexmit)
1246 {
1247         __be32 ip4_dst;
1248
1249         switch (group->proto) {
1250         case htons(ETH_P_IP):
1251                 ip4_dst = ip_dst ? ip_dst->dst.ip4 : htonl(INADDR_ALLHOSTS_GROUP);
1252                 return br_ip4_multicast_alloc_query(brmctx, pmctx, pg,
1253                                                     ip4_dst, group->dst.ip4,
1254                                                     with_srcs, over_lmqt,
1255                                                     sflag, igmp_type,
1256                                                     need_rexmit);
1257 #if IS_ENABLED(CONFIG_IPV6)
1258         case htons(ETH_P_IPV6): {
1259                 struct in6_addr ip6_dst;
1260
1261                 if (ip_dst)
1262                         ip6_dst = ip_dst->dst.ip6;
1263                 else
1264                         ipv6_addr_set(&ip6_dst, htonl(0xff020000), 0, 0,
1265                                       htonl(1));
1266
1267                 return br_ip6_multicast_alloc_query(brmctx, pmctx, pg,
1268                                                     &ip6_dst, &group->dst.ip6,
1269                                                     with_srcs, over_lmqt,
1270                                                     sflag, igmp_type,
1271                                                     need_rexmit);
1272         }
1273 #endif
1274         }
1275         return NULL;
1276 }
1277
1278 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
1279                                                     struct br_ip *group)
1280 {
1281         struct net_bridge_mdb_entry *mp;
1282         int err;
1283
1284         mp = br_mdb_ip_get(br, group);
1285         if (mp)
1286                 return mp;
1287
1288         if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
1289                 trace_br_mdb_full(br->dev, group);
1290                 br_mc_disabled_update(br->dev, false, NULL);
1291                 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
1292                 return ERR_PTR(-E2BIG);
1293         }
1294
1295         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
1296         if (unlikely(!mp))
1297                 return ERR_PTR(-ENOMEM);
1298
1299         mp->br = br;
1300         mp->addr = *group;
1301         mp->mcast_gc.destroy = br_multicast_destroy_mdb_entry;
1302         timer_setup(&mp->timer, br_multicast_group_expired, 0);
1303         err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
1304                                             br_mdb_rht_params);
1305         if (err) {
1306                 kfree(mp);
1307                 mp = ERR_PTR(err);
1308         } else {
1309                 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
1310         }
1311
1312         return mp;
1313 }
1314
1315 static void br_multicast_group_src_expired(struct timer_list *t)
1316 {
1317         struct net_bridge_group_src *src = from_timer(src, t, timer);
1318         struct net_bridge_port_group *pg;
1319         struct net_bridge *br = src->br;
1320
1321         spin_lock(&br->multicast_lock);
1322         if (hlist_unhashed(&src->node) || !netif_running(br->dev) ||
1323             timer_pending(&src->timer))
1324                 goto out;
1325
1326         pg = src->pg;
1327         if (pg->filter_mode == MCAST_INCLUDE) {
1328                 br_multicast_del_group_src(src, false);
1329                 if (!hlist_empty(&pg->src_list))
1330                         goto out;
1331                 br_multicast_find_del_pg(br, pg);
1332         } else {
1333                 br_multicast_fwd_src_handle(src);
1334         }
1335
1336 out:
1337         spin_unlock(&br->multicast_lock);
1338 }
1339
1340 struct net_bridge_group_src *
1341 br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip)
1342 {
1343         struct net_bridge_group_src *ent;
1344
1345         switch (ip->proto) {
1346         case htons(ETH_P_IP):
1347                 hlist_for_each_entry(ent, &pg->src_list, node)
1348                         if (ip->src.ip4 == ent->addr.src.ip4)
1349                                 return ent;
1350                 break;
1351 #if IS_ENABLED(CONFIG_IPV6)
1352         case htons(ETH_P_IPV6):
1353                 hlist_for_each_entry(ent, &pg->src_list, node)
1354                         if (!ipv6_addr_cmp(&ent->addr.src.ip6, &ip->src.ip6))
1355                                 return ent;
1356                 break;
1357 #endif
1358         }
1359
1360         return NULL;
1361 }
1362
1363 struct net_bridge_group_src *
1364 br_multicast_new_group_src(struct net_bridge_port_group *pg, struct br_ip *src_ip)
1365 {
1366         struct net_bridge_group_src *grp_src;
1367
1368         if (unlikely(pg->src_ents >= PG_SRC_ENT_LIMIT))
1369                 return NULL;
1370
1371         switch (src_ip->proto) {
1372         case htons(ETH_P_IP):
1373                 if (ipv4_is_zeronet(src_ip->src.ip4) ||
1374                     ipv4_is_multicast(src_ip->src.ip4))
1375                         return NULL;
1376                 break;
1377 #if IS_ENABLED(CONFIG_IPV6)
1378         case htons(ETH_P_IPV6):
1379                 if (ipv6_addr_any(&src_ip->src.ip6) ||
1380                     ipv6_addr_is_multicast(&src_ip->src.ip6))
1381                         return NULL;
1382                 break;
1383 #endif
1384         }
1385
1386         grp_src = kzalloc(sizeof(*grp_src), GFP_ATOMIC);
1387         if (unlikely(!grp_src))
1388                 return NULL;
1389
1390         grp_src->pg = pg;
1391         grp_src->br = pg->key.port->br;
1392         grp_src->addr = *src_ip;
1393         grp_src->mcast_gc.destroy = br_multicast_destroy_group_src;
1394         timer_setup(&grp_src->timer, br_multicast_group_src_expired, 0);
1395
1396         hlist_add_head_rcu(&grp_src->node, &pg->src_list);
1397         pg->src_ents++;
1398
1399         return grp_src;
1400 }
1401
1402 struct net_bridge_port_group *br_multicast_new_port_group(
1403                         struct net_bridge_port *port,
1404                         const struct br_ip *group,
1405                         struct net_bridge_port_group __rcu *next,
1406                         unsigned char flags,
1407                         const unsigned char *src,
1408                         u8 filter_mode,
1409                         u8 rt_protocol,
1410                         struct netlink_ext_ack *extack)
1411 {
1412         struct net_bridge_port_group *p;
1413         int err;
1414
1415         err = br_multicast_port_ngroups_inc(port, group, extack);
1416         if (err)
1417                 return NULL;
1418
1419         p = kzalloc(sizeof(*p), GFP_ATOMIC);
1420         if (unlikely(!p)) {
1421                 NL_SET_ERR_MSG_MOD(extack, "Couldn't allocate new port group");
1422                 goto dec_out;
1423         }
1424
1425         p->key.addr = *group;
1426         p->key.port = port;
1427         p->flags = flags;
1428         p->filter_mode = filter_mode;
1429         p->rt_protocol = rt_protocol;
1430         p->eht_host_tree = RB_ROOT;
1431         p->eht_set_tree = RB_ROOT;
1432         p->mcast_gc.destroy = br_multicast_destroy_port_group;
1433         INIT_HLIST_HEAD(&p->src_list);
1434
1435         if (!br_multicast_is_star_g(group) &&
1436             rhashtable_lookup_insert_fast(&port->br->sg_port_tbl, &p->rhnode,
1437                                           br_sg_port_rht_params)) {
1438                 NL_SET_ERR_MSG_MOD(extack, "Couldn't insert new port group");
1439                 goto free_out;
1440         }
1441
1442         rcu_assign_pointer(p->next, next);
1443         timer_setup(&p->timer, br_multicast_port_group_expired, 0);
1444         timer_setup(&p->rexmit_timer, br_multicast_port_group_rexmit, 0);
1445         hlist_add_head(&p->mglist, &port->mglist);
1446
1447         if (src)
1448                 memcpy(p->eth_addr, src, ETH_ALEN);
1449         else
1450                 eth_broadcast_addr(p->eth_addr);
1451
1452         return p;
1453
1454 free_out:
1455         kfree(p);
1456 dec_out:
1457         br_multicast_port_ngroups_dec(port, group->vid);
1458         return NULL;
1459 }
1460
1461 void br_multicast_del_port_group(struct net_bridge_port_group *p)
1462 {
1463         struct net_bridge_port *port = p->key.port;
1464         __u16 vid = p->key.addr.vid;
1465
1466         hlist_del_init(&p->mglist);
1467         if (!br_multicast_is_star_g(&p->key.addr))
1468                 rhashtable_remove_fast(&port->br->sg_port_tbl, &p->rhnode,
1469                                        br_sg_port_rht_params);
1470         kfree(p);
1471         br_multicast_port_ngroups_dec(port, vid);
1472 }
1473
1474 void br_multicast_host_join(const struct net_bridge_mcast *brmctx,
1475                             struct net_bridge_mdb_entry *mp, bool notify)
1476 {
1477         if (!mp->host_joined) {
1478                 mp->host_joined = true;
1479                 if (br_multicast_is_star_g(&mp->addr))
1480                         br_multicast_star_g_host_state(mp);
1481                 if (notify)
1482                         br_mdb_notify(mp->br->dev, mp, NULL, RTM_NEWMDB);
1483         }
1484
1485         if (br_group_is_l2(&mp->addr))
1486                 return;
1487
1488         mod_timer(&mp->timer, jiffies + brmctx->multicast_membership_interval);
1489 }
1490
1491 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify)
1492 {
1493         if (!mp->host_joined)
1494                 return;
1495
1496         mp->host_joined = false;
1497         if (br_multicast_is_star_g(&mp->addr))
1498                 br_multicast_star_g_host_state(mp);
1499         if (notify)
1500                 br_mdb_notify(mp->br->dev, mp, NULL, RTM_DELMDB);
1501 }
1502
1503 static struct net_bridge_port_group *
1504 __br_multicast_add_group(struct net_bridge_mcast *brmctx,
1505                          struct net_bridge_mcast_port *pmctx,
1506                          struct br_ip *group,
1507                          const unsigned char *src,
1508                          u8 filter_mode,
1509                          bool igmpv2_mldv1,
1510                          bool blocked)
1511 {
1512         struct net_bridge_port_group __rcu **pp;
1513         struct net_bridge_port_group *p = NULL;
1514         struct net_bridge_mdb_entry *mp;
1515         unsigned long now = jiffies;
1516
1517         if (!br_multicast_ctx_should_use(brmctx, pmctx))
1518                 goto out;
1519
1520         mp = br_multicast_new_group(brmctx->br, group);
1521         if (IS_ERR(mp))
1522                 return ERR_CAST(mp);
1523
1524         if (!pmctx) {
1525                 br_multicast_host_join(brmctx, mp, true);
1526                 goto out;
1527         }
1528
1529         for (pp = &mp->ports;
1530              (p = mlock_dereference(*pp, brmctx->br)) != NULL;
1531              pp = &p->next) {
1532                 if (br_port_group_equal(p, pmctx->port, src))
1533                         goto found;
1534                 if ((unsigned long)p->key.port < (unsigned long)pmctx->port)
1535                         break;
1536         }
1537
1538         p = br_multicast_new_port_group(pmctx->port, group, *pp, 0, src,
1539                                         filter_mode, RTPROT_KERNEL, NULL);
1540         if (unlikely(!p)) {
1541                 p = ERR_PTR(-ENOMEM);
1542                 goto out;
1543         }
1544         rcu_assign_pointer(*pp, p);
1545         if (blocked)
1546                 p->flags |= MDB_PG_FLAGS_BLOCKED;
1547         br_mdb_notify(brmctx->br->dev, mp, p, RTM_NEWMDB);
1548
1549 found:
1550         if (igmpv2_mldv1)
1551                 mod_timer(&p->timer,
1552                           now + brmctx->multicast_membership_interval);
1553
1554 out:
1555         return p;
1556 }
1557
1558 static int br_multicast_add_group(struct net_bridge_mcast *brmctx,
1559                                   struct net_bridge_mcast_port *pmctx,
1560                                   struct br_ip *group,
1561                                   const unsigned char *src,
1562                                   u8 filter_mode,
1563                                   bool igmpv2_mldv1)
1564 {
1565         struct net_bridge_port_group *pg;
1566         int err;
1567
1568         spin_lock(&brmctx->br->multicast_lock);
1569         pg = __br_multicast_add_group(brmctx, pmctx, group, src, filter_mode,
1570                                       igmpv2_mldv1, false);
1571         /* NULL is considered valid for host joined groups */
1572         err = PTR_ERR_OR_ZERO(pg);
1573         spin_unlock(&brmctx->br->multicast_lock);
1574
1575         return err;
1576 }
1577
1578 static int br_ip4_multicast_add_group(struct net_bridge_mcast *brmctx,
1579                                       struct net_bridge_mcast_port *pmctx,
1580                                       __be32 group,
1581                                       __u16 vid,
1582                                       const unsigned char *src,
1583                                       bool igmpv2)
1584 {
1585         struct br_ip br_group;
1586         u8 filter_mode;
1587
1588         if (ipv4_is_local_multicast(group))
1589                 return 0;
1590
1591         memset(&br_group, 0, sizeof(br_group));
1592         br_group.dst.ip4 = group;
1593         br_group.proto = htons(ETH_P_IP);
1594         br_group.vid = vid;
1595         filter_mode = igmpv2 ? MCAST_EXCLUDE : MCAST_INCLUDE;
1596
1597         return br_multicast_add_group(brmctx, pmctx, &br_group, src,
1598                                       filter_mode, igmpv2);
1599 }
1600
1601 #if IS_ENABLED(CONFIG_IPV6)
1602 static int br_ip6_multicast_add_group(struct net_bridge_mcast *brmctx,
1603                                       struct net_bridge_mcast_port *pmctx,
1604                                       const struct in6_addr *group,
1605                                       __u16 vid,
1606                                       const unsigned char *src,
1607                                       bool mldv1)
1608 {
1609         struct br_ip br_group;
1610         u8 filter_mode;
1611
1612         if (ipv6_addr_is_ll_all_nodes(group))
1613                 return 0;
1614
1615         memset(&br_group, 0, sizeof(br_group));
1616         br_group.dst.ip6 = *group;
1617         br_group.proto = htons(ETH_P_IPV6);
1618         br_group.vid = vid;
1619         filter_mode = mldv1 ? MCAST_EXCLUDE : MCAST_INCLUDE;
1620
1621         return br_multicast_add_group(brmctx, pmctx, &br_group, src,
1622                                       filter_mode, mldv1);
1623 }
1624 #endif
1625
1626 static bool br_multicast_rport_del(struct hlist_node *rlist)
1627 {
1628         if (hlist_unhashed(rlist))
1629                 return false;
1630
1631         hlist_del_init_rcu(rlist);
1632         return true;
1633 }
1634
1635 static bool br_ip4_multicast_rport_del(struct net_bridge_mcast_port *pmctx)
1636 {
1637         return br_multicast_rport_del(&pmctx->ip4_rlist);
1638 }
1639
1640 static bool br_ip6_multicast_rport_del(struct net_bridge_mcast_port *pmctx)
1641 {
1642 #if IS_ENABLED(CONFIG_IPV6)
1643         return br_multicast_rport_del(&pmctx->ip6_rlist);
1644 #else
1645         return false;
1646 #endif
1647 }
1648
1649 static void br_multicast_router_expired(struct net_bridge_mcast_port *pmctx,
1650                                         struct timer_list *t,
1651                                         struct hlist_node *rlist)
1652 {
1653         struct net_bridge *br = pmctx->port->br;
1654         bool del;
1655
1656         spin_lock(&br->multicast_lock);
1657         if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED ||
1658             pmctx->multicast_router == MDB_RTR_TYPE_PERM ||
1659             timer_pending(t))
1660                 goto out;
1661
1662         del = br_multicast_rport_del(rlist);
1663         br_multicast_rport_del_notify(pmctx, del);
1664 out:
1665         spin_unlock(&br->multicast_lock);
1666 }
1667
1668 static void br_ip4_multicast_router_expired(struct timer_list *t)
1669 {
1670         struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t,
1671                                                          ip4_mc_router_timer);
1672
1673         br_multicast_router_expired(pmctx, t, &pmctx->ip4_rlist);
1674 }
1675
1676 #if IS_ENABLED(CONFIG_IPV6)
1677 static void br_ip6_multicast_router_expired(struct timer_list *t)
1678 {
1679         struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t,
1680                                                          ip6_mc_router_timer);
1681
1682         br_multicast_router_expired(pmctx, t, &pmctx->ip6_rlist);
1683 }
1684 #endif
1685
1686 static void br_mc_router_state_change(struct net_bridge *p,
1687                                       bool is_mc_router)
1688 {
1689         struct switchdev_attr attr = {
1690                 .orig_dev = p->dev,
1691                 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
1692                 .flags = SWITCHDEV_F_DEFER,
1693                 .u.mrouter = is_mc_router,
1694         };
1695
1696         switchdev_port_attr_set(p->dev, &attr, NULL);
1697 }
1698
1699 static void br_multicast_local_router_expired(struct net_bridge_mcast *brmctx,
1700                                               struct timer_list *timer)
1701 {
1702         spin_lock(&brmctx->br->multicast_lock);
1703         if (brmctx->multicast_router == MDB_RTR_TYPE_DISABLED ||
1704             brmctx->multicast_router == MDB_RTR_TYPE_PERM ||
1705             br_ip4_multicast_is_router(brmctx) ||
1706             br_ip6_multicast_is_router(brmctx))
1707                 goto out;
1708
1709         br_mc_router_state_change(brmctx->br, false);
1710 out:
1711         spin_unlock(&brmctx->br->multicast_lock);
1712 }
1713
1714 static void br_ip4_multicast_local_router_expired(struct timer_list *t)
1715 {
1716         struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
1717                                                      ip4_mc_router_timer);
1718
1719         br_multicast_local_router_expired(brmctx, t);
1720 }
1721
1722 #if IS_ENABLED(CONFIG_IPV6)
1723 static void br_ip6_multicast_local_router_expired(struct timer_list *t)
1724 {
1725         struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
1726                                                      ip6_mc_router_timer);
1727
1728         br_multicast_local_router_expired(brmctx, t);
1729 }
1730 #endif
1731
1732 static void br_multicast_querier_expired(struct net_bridge_mcast *brmctx,
1733                                          struct bridge_mcast_own_query *query)
1734 {
1735         spin_lock(&brmctx->br->multicast_lock);
1736         if (!netif_running(brmctx->br->dev) ||
1737             br_multicast_ctx_vlan_global_disabled(brmctx) ||
1738             !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED))
1739                 goto out;
1740
1741         br_multicast_start_querier(brmctx, query);
1742
1743 out:
1744         spin_unlock(&brmctx->br->multicast_lock);
1745 }
1746
1747 static void br_ip4_multicast_querier_expired(struct timer_list *t)
1748 {
1749         struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
1750                                                      ip4_other_query.timer);
1751
1752         br_multicast_querier_expired(brmctx, &brmctx->ip4_own_query);
1753 }
1754
1755 #if IS_ENABLED(CONFIG_IPV6)
1756 static void br_ip6_multicast_querier_expired(struct timer_list *t)
1757 {
1758         struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
1759                                                      ip6_other_query.timer);
1760
1761         br_multicast_querier_expired(brmctx, &brmctx->ip6_own_query);
1762 }
1763 #endif
1764
1765 static void br_multicast_select_own_querier(struct net_bridge_mcast *brmctx,
1766                                             struct br_ip *ip,
1767                                             struct sk_buff *skb)
1768 {
1769         if (ip->proto == htons(ETH_P_IP))
1770                 brmctx->ip4_querier.addr.src.ip4 = ip_hdr(skb)->saddr;
1771 #if IS_ENABLED(CONFIG_IPV6)
1772         else
1773                 brmctx->ip6_querier.addr.src.ip6 = ipv6_hdr(skb)->saddr;
1774 #endif
1775 }
1776
1777 static void __br_multicast_send_query(struct net_bridge_mcast *brmctx,
1778                                       struct net_bridge_mcast_port *pmctx,
1779                                       struct net_bridge_port_group *pg,
1780                                       struct br_ip *ip_dst,
1781                                       struct br_ip *group,
1782                                       bool with_srcs,
1783                                       u8 sflag,
1784                                       bool *need_rexmit)
1785 {
1786         bool over_lmqt = !!sflag;
1787         struct sk_buff *skb;
1788         u8 igmp_type;
1789
1790         if (!br_multicast_ctx_should_use(brmctx, pmctx) ||
1791             !br_multicast_ctx_matches_vlan_snooping(brmctx))
1792                 return;
1793
1794 again_under_lmqt:
1795         skb = br_multicast_alloc_query(brmctx, pmctx, pg, ip_dst, group,
1796                                        with_srcs, over_lmqt, sflag, &igmp_type,
1797                                        need_rexmit);
1798         if (!skb)
1799                 return;
1800
1801         if (pmctx) {
1802                 skb->dev = pmctx->port->dev;
1803                 br_multicast_count(brmctx->br, pmctx->port, skb, igmp_type,
1804                                    BR_MCAST_DIR_TX);
1805                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
1806                         dev_net(pmctx->port->dev), NULL, skb, NULL, skb->dev,
1807                         br_dev_queue_push_xmit);
1808
1809                 if (over_lmqt && with_srcs && sflag) {
1810                         over_lmqt = false;
1811                         goto again_under_lmqt;
1812                 }
1813         } else {
1814                 br_multicast_select_own_querier(brmctx, group, skb);
1815                 br_multicast_count(brmctx->br, NULL, skb, igmp_type,
1816                                    BR_MCAST_DIR_RX);
1817                 netif_rx(skb);
1818         }
1819 }
1820
1821 static void br_multicast_read_querier(const struct bridge_mcast_querier *querier,
1822                                       struct bridge_mcast_querier *dest)
1823 {
1824         unsigned int seq;
1825
1826         memset(dest, 0, sizeof(*dest));
1827         do {
1828                 seq = read_seqcount_begin(&querier->seq);
1829                 dest->port_ifidx = querier->port_ifidx;
1830                 memcpy(&dest->addr, &querier->addr, sizeof(struct br_ip));
1831         } while (read_seqcount_retry(&querier->seq, seq));
1832 }
1833
1834 static void br_multicast_update_querier(struct net_bridge_mcast *brmctx,
1835                                         struct bridge_mcast_querier *querier,
1836                                         int ifindex,
1837                                         struct br_ip *saddr)
1838 {
1839         write_seqcount_begin(&querier->seq);
1840         querier->port_ifidx = ifindex;
1841         memcpy(&querier->addr, saddr, sizeof(*saddr));
1842         write_seqcount_end(&querier->seq);
1843 }
1844
1845 static void br_multicast_send_query(struct net_bridge_mcast *brmctx,
1846                                     struct net_bridge_mcast_port *pmctx,
1847                                     struct bridge_mcast_own_query *own_query)
1848 {
1849         struct bridge_mcast_other_query *other_query = NULL;
1850         struct bridge_mcast_querier *querier;
1851         struct br_ip br_group;
1852         unsigned long time;
1853
1854         if (!br_multicast_ctx_should_use(brmctx, pmctx) ||
1855             !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) ||
1856             !brmctx->multicast_querier)
1857                 return;
1858
1859         memset(&br_group.dst, 0, sizeof(br_group.dst));
1860
1861         if (pmctx ? (own_query == &pmctx->ip4_own_query) :
1862                     (own_query == &brmctx->ip4_own_query)) {
1863                 querier = &brmctx->ip4_querier;
1864                 other_query = &brmctx->ip4_other_query;
1865                 br_group.proto = htons(ETH_P_IP);
1866 #if IS_ENABLED(CONFIG_IPV6)
1867         } else {
1868                 querier = &brmctx->ip6_querier;
1869                 other_query = &brmctx->ip6_other_query;
1870                 br_group.proto = htons(ETH_P_IPV6);
1871 #endif
1872         }
1873
1874         if (!other_query || timer_pending(&other_query->timer))
1875                 return;
1876
1877         /* we're about to select ourselves as querier */
1878         if (!pmctx && querier->port_ifidx) {
1879                 struct br_ip zeroip = {};
1880
1881                 br_multicast_update_querier(brmctx, querier, 0, &zeroip);
1882         }
1883
1884         __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &br_group, false,
1885                                   0, NULL);
1886
1887         time = jiffies;
1888         time += own_query->startup_sent < brmctx->multicast_startup_query_count ?
1889                 brmctx->multicast_startup_query_interval :
1890                 brmctx->multicast_query_interval;
1891         mod_timer(&own_query->timer, time);
1892 }
1893
1894 static void
1895 br_multicast_port_query_expired(struct net_bridge_mcast_port *pmctx,
1896                                 struct bridge_mcast_own_query *query)
1897 {
1898         struct net_bridge *br = pmctx->port->br;
1899         struct net_bridge_mcast *brmctx;
1900
1901         spin_lock(&br->multicast_lock);
1902         if (br_multicast_port_ctx_state_stopped(pmctx))
1903                 goto out;
1904
1905         brmctx = br_multicast_port_ctx_get_global(pmctx);
1906         if (query->startup_sent < brmctx->multicast_startup_query_count)
1907                 query->startup_sent++;
1908
1909         br_multicast_send_query(brmctx, pmctx, query);
1910
1911 out:
1912         spin_unlock(&br->multicast_lock);
1913 }
1914
1915 static void br_ip4_multicast_port_query_expired(struct timer_list *t)
1916 {
1917         struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t,
1918                                                          ip4_own_query.timer);
1919
1920         br_multicast_port_query_expired(pmctx, &pmctx->ip4_own_query);
1921 }
1922
1923 #if IS_ENABLED(CONFIG_IPV6)
1924 static void br_ip6_multicast_port_query_expired(struct timer_list *t)
1925 {
1926         struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t,
1927                                                          ip6_own_query.timer);
1928
1929         br_multicast_port_query_expired(pmctx, &pmctx->ip6_own_query);
1930 }
1931 #endif
1932
1933 static void br_multicast_port_group_rexmit(struct timer_list *t)
1934 {
1935         struct net_bridge_port_group *pg = from_timer(pg, t, rexmit_timer);
1936         struct bridge_mcast_other_query *other_query = NULL;
1937         struct net_bridge *br = pg->key.port->br;
1938         struct net_bridge_mcast_port *pmctx;
1939         struct net_bridge_mcast *brmctx;
1940         bool need_rexmit = false;
1941
1942         spin_lock(&br->multicast_lock);
1943         if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
1944             !br_opt_get(br, BROPT_MULTICAST_ENABLED))
1945                 goto out;
1946
1947         pmctx = br_multicast_pg_to_port_ctx(pg);
1948         if (!pmctx)
1949                 goto out;
1950         brmctx = br_multicast_port_ctx_get_global(pmctx);
1951         if (!brmctx->multicast_querier)
1952                 goto out;
1953
1954         if (pg->key.addr.proto == htons(ETH_P_IP))
1955                 other_query = &brmctx->ip4_other_query;
1956 #if IS_ENABLED(CONFIG_IPV6)
1957         else
1958                 other_query = &brmctx->ip6_other_query;
1959 #endif
1960
1961         if (!other_query || timer_pending(&other_query->timer))
1962                 goto out;
1963
1964         if (pg->grp_query_rexmit_cnt) {
1965                 pg->grp_query_rexmit_cnt--;
1966                 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
1967                                           &pg->key.addr, false, 1, NULL);
1968         }
1969         __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
1970                                   &pg->key.addr, true, 0, &need_rexmit);
1971
1972         if (pg->grp_query_rexmit_cnt || need_rexmit)
1973                 mod_timer(&pg->rexmit_timer, jiffies +
1974                                              brmctx->multicast_last_member_interval);
1975 out:
1976         spin_unlock(&br->multicast_lock);
1977 }
1978
1979 static int br_mc_disabled_update(struct net_device *dev, bool value,
1980                                  struct netlink_ext_ack *extack)
1981 {
1982         struct switchdev_attr attr = {
1983                 .orig_dev = dev,
1984                 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1985                 .flags = SWITCHDEV_F_DEFER,
1986                 .u.mc_disabled = !value,
1987         };
1988
1989         return switchdev_port_attr_set(dev, &attr, extack);
1990 }
1991
1992 void br_multicast_port_ctx_init(struct net_bridge_port *port,
1993                                 struct net_bridge_vlan *vlan,
1994                                 struct net_bridge_mcast_port *pmctx)
1995 {
1996         pmctx->port = port;
1997         pmctx->vlan = vlan;
1998         pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1999         timer_setup(&pmctx->ip4_mc_router_timer,
2000                     br_ip4_multicast_router_expired, 0);
2001         timer_setup(&pmctx->ip4_own_query.timer,
2002                     br_ip4_multicast_port_query_expired, 0);
2003 #if IS_ENABLED(CONFIG_IPV6)
2004         timer_setup(&pmctx->ip6_mc_router_timer,
2005                     br_ip6_multicast_router_expired, 0);
2006         timer_setup(&pmctx->ip6_own_query.timer,
2007                     br_ip6_multicast_port_query_expired, 0);
2008 #endif
2009 }
2010
2011 void br_multicast_port_ctx_deinit(struct net_bridge_mcast_port *pmctx)
2012 {
2013 #if IS_ENABLED(CONFIG_IPV6)
2014         del_timer_sync(&pmctx->ip6_mc_router_timer);
2015 #endif
2016         del_timer_sync(&pmctx->ip4_mc_router_timer);
2017 }
2018
2019 int br_multicast_add_port(struct net_bridge_port *port)
2020 {
2021         int err;
2022
2023         port->multicast_eht_hosts_limit = BR_MCAST_DEFAULT_EHT_HOSTS_LIMIT;
2024         br_multicast_port_ctx_init(port, NULL, &port->multicast_ctx);
2025
2026         err = br_mc_disabled_update(port->dev,
2027                                     br_opt_get(port->br,
2028                                                BROPT_MULTICAST_ENABLED),
2029                                     NULL);
2030         if (err && err != -EOPNOTSUPP)
2031                 return err;
2032
2033         port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2034         if (!port->mcast_stats)
2035                 return -ENOMEM;
2036
2037         return 0;
2038 }
2039
2040 void br_multicast_del_port(struct net_bridge_port *port)
2041 {
2042         struct net_bridge *br = port->br;
2043         struct net_bridge_port_group *pg;
2044         HLIST_HEAD(deleted_head);
2045         struct hlist_node *n;
2046
2047         /* Take care of the remaining groups, only perm ones should be left */
2048         spin_lock_bh(&br->multicast_lock);
2049         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
2050                 br_multicast_find_del_pg(br, pg);
2051         hlist_move_list(&br->mcast_gc_list, &deleted_head);
2052         spin_unlock_bh(&br->multicast_lock);
2053         br_multicast_gc(&deleted_head);
2054         br_multicast_port_ctx_deinit(&port->multicast_ctx);
2055         free_percpu(port->mcast_stats);
2056 }
2057
2058 static void br_multicast_enable(struct bridge_mcast_own_query *query)
2059 {
2060         query->startup_sent = 0;
2061
2062         if (try_to_del_timer_sync(&query->timer) >= 0 ||
2063             del_timer(&query->timer))
2064                 mod_timer(&query->timer, jiffies);
2065 }
2066
2067 static void __br_multicast_enable_port_ctx(struct net_bridge_mcast_port *pmctx)
2068 {
2069         struct net_bridge *br = pmctx->port->br;
2070         struct net_bridge_mcast *brmctx;
2071
2072         brmctx = br_multicast_port_ctx_get_global(pmctx);
2073         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
2074             !netif_running(br->dev))
2075                 return;
2076
2077         br_multicast_enable(&pmctx->ip4_own_query);
2078 #if IS_ENABLED(CONFIG_IPV6)
2079         br_multicast_enable(&pmctx->ip6_own_query);
2080 #endif
2081         if (pmctx->multicast_router == MDB_RTR_TYPE_PERM) {
2082                 br_ip4_multicast_add_router(brmctx, pmctx);
2083                 br_ip6_multicast_add_router(brmctx, pmctx);
2084         }
2085
2086         if (br_multicast_port_ctx_is_vlan(pmctx)) {
2087                 struct net_bridge_port_group *pg;
2088                 u32 n = 0;
2089
2090                 /* The mcast_n_groups counter might be wrong. First,
2091                  * BR_VLFLAG_MCAST_ENABLED is toggled before temporary entries
2092                  * are flushed, thus mcast_n_groups after the toggle does not
2093                  * reflect the true values. And second, permanent entries added
2094                  * while BR_VLFLAG_MCAST_ENABLED was disabled, are not reflected
2095                  * either. Thus we have to refresh the counter.
2096                  */
2097
2098                 hlist_for_each_entry(pg, &pmctx->port->mglist, mglist) {
2099                         if (pg->key.addr.vid == pmctx->vlan->vid)
2100                                 n++;
2101                 }
2102                 WRITE_ONCE(pmctx->mdb_n_entries, n);
2103         }
2104 }
2105
2106 void br_multicast_enable_port(struct net_bridge_port *port)
2107 {
2108         struct net_bridge *br = port->br;
2109
2110         spin_lock_bh(&br->multicast_lock);
2111         __br_multicast_enable_port_ctx(&port->multicast_ctx);
2112         spin_unlock_bh(&br->multicast_lock);
2113 }
2114
2115 static void __br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx)
2116 {
2117         struct net_bridge_port_group *pg;
2118         struct hlist_node *n;
2119         bool del = false;
2120
2121         hlist_for_each_entry_safe(pg, n, &pmctx->port->mglist, mglist)
2122                 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT) &&
2123                     (!br_multicast_port_ctx_is_vlan(pmctx) ||
2124                      pg->key.addr.vid == pmctx->vlan->vid))
2125                         br_multicast_find_del_pg(pmctx->port->br, pg);
2126
2127         del |= br_ip4_multicast_rport_del(pmctx);
2128         del_timer(&pmctx->ip4_mc_router_timer);
2129         del_timer(&pmctx->ip4_own_query.timer);
2130         del |= br_ip6_multicast_rport_del(pmctx);
2131 #if IS_ENABLED(CONFIG_IPV6)
2132         del_timer(&pmctx->ip6_mc_router_timer);
2133         del_timer(&pmctx->ip6_own_query.timer);
2134 #endif
2135         br_multicast_rport_del_notify(pmctx, del);
2136 }
2137
2138 void br_multicast_disable_port(struct net_bridge_port *port)
2139 {
2140         spin_lock_bh(&port->br->multicast_lock);
2141         __br_multicast_disable_port_ctx(&port->multicast_ctx);
2142         spin_unlock_bh(&port->br->multicast_lock);
2143 }
2144
2145 static int __grp_src_delete_marked(struct net_bridge_port_group *pg)
2146 {
2147         struct net_bridge_group_src *ent;
2148         struct hlist_node *tmp;
2149         int deleted = 0;
2150
2151         hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
2152                 if (ent->flags & BR_SGRP_F_DELETE) {
2153                         br_multicast_del_group_src(ent, false);
2154                         deleted++;
2155                 }
2156
2157         return deleted;
2158 }
2159
2160 static void __grp_src_mod_timer(struct net_bridge_group_src *src,
2161                                 unsigned long expires)
2162 {
2163         mod_timer(&src->timer, expires);
2164         br_multicast_fwd_src_handle(src);
2165 }
2166
2167 static void __grp_src_query_marked_and_rexmit(struct net_bridge_mcast *brmctx,
2168                                               struct net_bridge_mcast_port *pmctx,
2169                                               struct net_bridge_port_group *pg)
2170 {
2171         struct bridge_mcast_other_query *other_query = NULL;
2172         u32 lmqc = brmctx->multicast_last_member_count;
2173         unsigned long lmqt, lmi, now = jiffies;
2174         struct net_bridge_group_src *ent;
2175
2176         if (!netif_running(brmctx->br->dev) ||
2177             !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED))
2178                 return;
2179
2180         if (pg->key.addr.proto == htons(ETH_P_IP))
2181                 other_query = &brmctx->ip4_other_query;
2182 #if IS_ENABLED(CONFIG_IPV6)
2183         else
2184                 other_query = &brmctx->ip6_other_query;
2185 #endif
2186
2187         lmqt = now + br_multicast_lmqt(brmctx);
2188         hlist_for_each_entry(ent, &pg->src_list, node) {
2189                 if (ent->flags & BR_SGRP_F_SEND) {
2190                         ent->flags &= ~BR_SGRP_F_SEND;
2191                         if (ent->timer.expires > lmqt) {
2192                                 if (brmctx->multicast_querier &&
2193                                     other_query &&
2194                                     !timer_pending(&other_query->timer))
2195                                         ent->src_query_rexmit_cnt = lmqc;
2196                                 __grp_src_mod_timer(ent, lmqt);
2197                         }
2198                 }
2199         }
2200
2201         if (!brmctx->multicast_querier ||
2202             !other_query || timer_pending(&other_query->timer))
2203                 return;
2204
2205         __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
2206                                   &pg->key.addr, true, 1, NULL);
2207
2208         lmi = now + brmctx->multicast_last_member_interval;
2209         if (!timer_pending(&pg->rexmit_timer) ||
2210             time_after(pg->rexmit_timer.expires, lmi))
2211                 mod_timer(&pg->rexmit_timer, lmi);
2212 }
2213
2214 static void __grp_send_query_and_rexmit(struct net_bridge_mcast *brmctx,
2215                                         struct net_bridge_mcast_port *pmctx,
2216                                         struct net_bridge_port_group *pg)
2217 {
2218         struct bridge_mcast_other_query *other_query = NULL;
2219         unsigned long now = jiffies, lmi;
2220
2221         if (!netif_running(brmctx->br->dev) ||
2222             !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED))
2223                 return;
2224
2225         if (pg->key.addr.proto == htons(ETH_P_IP))
2226                 other_query = &brmctx->ip4_other_query;
2227 #if IS_ENABLED(CONFIG_IPV6)
2228         else
2229                 other_query = &brmctx->ip6_other_query;
2230 #endif
2231
2232         if (brmctx->multicast_querier &&
2233             other_query && !timer_pending(&other_query->timer)) {
2234                 lmi = now + brmctx->multicast_last_member_interval;
2235                 pg->grp_query_rexmit_cnt = brmctx->multicast_last_member_count - 1;
2236                 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr,
2237                                           &pg->key.addr, false, 0, NULL);
2238                 if (!timer_pending(&pg->rexmit_timer) ||
2239                     time_after(pg->rexmit_timer.expires, lmi))
2240                         mod_timer(&pg->rexmit_timer, lmi);
2241         }
2242
2243         if (pg->filter_mode == MCAST_EXCLUDE &&
2244             (!timer_pending(&pg->timer) ||
2245              time_after(pg->timer.expires, now + br_multicast_lmqt(brmctx))))
2246                 mod_timer(&pg->timer, now + br_multicast_lmqt(brmctx));
2247 }
2248
2249 /* State          Msg type      New state                Actions
2250  * INCLUDE (A)    IS_IN (B)     INCLUDE (A+B)            (B)=GMI
2251  * INCLUDE (A)    ALLOW (B)     INCLUDE (A+B)            (B)=GMI
2252  * EXCLUDE (X,Y)  ALLOW (A)     EXCLUDE (X+A,Y-A)        (A)=GMI
2253  */
2254 static bool br_multicast_isinc_allow(const struct net_bridge_mcast *brmctx,
2255                                      struct net_bridge_port_group *pg, void *h_addr,
2256                                      void *srcs, u32 nsrcs, size_t addr_size,
2257                                      int grec_type)
2258 {
2259         struct net_bridge_group_src *ent;
2260         unsigned long now = jiffies;
2261         bool changed = false;
2262         struct br_ip src_ip;
2263         u32 src_idx;
2264
2265         memset(&src_ip, 0, sizeof(src_ip));
2266         src_ip.proto = pg->key.addr.proto;
2267         for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2268                 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2269                 ent = br_multicast_find_group_src(pg, &src_ip);
2270                 if (!ent) {
2271                         ent = br_multicast_new_group_src(pg, &src_ip);
2272                         if (ent)
2273                                 changed = true;
2274                 }
2275
2276                 if (ent)
2277                         __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx));
2278         }
2279
2280         if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2281                                     grec_type))
2282                 changed = true;
2283
2284         return changed;
2285 }
2286
2287 /* State          Msg type      New state                Actions
2288  * INCLUDE (A)    IS_EX (B)     EXCLUDE (A*B,B-A)        (B-A)=0
2289  *                                                       Delete (A-B)
2290  *                                                       Group Timer=GMI
2291  */
2292 static void __grp_src_isexc_incl(const struct net_bridge_mcast *brmctx,
2293                                  struct net_bridge_port_group *pg, void *h_addr,
2294                                  void *srcs, u32 nsrcs, size_t addr_size,
2295                                  int grec_type)
2296 {
2297         struct net_bridge_group_src *ent;
2298         struct br_ip src_ip;
2299         u32 src_idx;
2300
2301         hlist_for_each_entry(ent, &pg->src_list, node)
2302                 ent->flags |= BR_SGRP_F_DELETE;
2303
2304         memset(&src_ip, 0, sizeof(src_ip));
2305         src_ip.proto = pg->key.addr.proto;
2306         for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2307                 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2308                 ent = br_multicast_find_group_src(pg, &src_ip);
2309                 if (ent)
2310                         ent->flags &= ~BR_SGRP_F_DELETE;
2311                 else
2312                         ent = br_multicast_new_group_src(pg, &src_ip);
2313                 if (ent)
2314                         br_multicast_fwd_src_handle(ent);
2315         }
2316
2317         br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2318                                 grec_type);
2319
2320         __grp_src_delete_marked(pg);
2321 }
2322
2323 /* State          Msg type      New state                Actions
2324  * EXCLUDE (X,Y)  IS_EX (A)     EXCLUDE (A-Y,Y*A)        (A-X-Y)=GMI
2325  *                                                       Delete (X-A)
2326  *                                                       Delete (Y-A)
2327  *                                                       Group Timer=GMI
2328  */
2329 static bool __grp_src_isexc_excl(const struct net_bridge_mcast *brmctx,
2330                                  struct net_bridge_port_group *pg, void *h_addr,
2331                                  void *srcs, u32 nsrcs, size_t addr_size,
2332                                  int grec_type)
2333 {
2334         struct net_bridge_group_src *ent;
2335         unsigned long now = jiffies;
2336         bool changed = false;
2337         struct br_ip src_ip;
2338         u32 src_idx;
2339
2340         hlist_for_each_entry(ent, &pg->src_list, node)
2341                 ent->flags |= BR_SGRP_F_DELETE;
2342
2343         memset(&src_ip, 0, sizeof(src_ip));
2344         src_ip.proto = pg->key.addr.proto;
2345         for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2346                 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2347                 ent = br_multicast_find_group_src(pg, &src_ip);
2348                 if (ent) {
2349                         ent->flags &= ~BR_SGRP_F_DELETE;
2350                 } else {
2351                         ent = br_multicast_new_group_src(pg, &src_ip);
2352                         if (ent) {
2353                                 __grp_src_mod_timer(ent,
2354                                                     now + br_multicast_gmi(brmctx));
2355                                 changed = true;
2356                         }
2357                 }
2358         }
2359
2360         if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2361                                     grec_type))
2362                 changed = true;
2363
2364         if (__grp_src_delete_marked(pg))
2365                 changed = true;
2366
2367         return changed;
2368 }
2369
2370 static bool br_multicast_isexc(const struct net_bridge_mcast *brmctx,
2371                                struct net_bridge_port_group *pg, void *h_addr,
2372                                void *srcs, u32 nsrcs, size_t addr_size,
2373                                int grec_type)
2374 {
2375         bool changed = false;
2376
2377         switch (pg->filter_mode) {
2378         case MCAST_INCLUDE:
2379                 __grp_src_isexc_incl(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2380                                      grec_type);
2381                 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
2382                 changed = true;
2383                 break;
2384         case MCAST_EXCLUDE:
2385                 changed = __grp_src_isexc_excl(brmctx, pg, h_addr, srcs, nsrcs,
2386                                                addr_size, grec_type);
2387                 break;
2388         }
2389
2390         pg->filter_mode = MCAST_EXCLUDE;
2391         mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx));
2392
2393         return changed;
2394 }
2395
2396 /* State          Msg type      New state                Actions
2397  * INCLUDE (A)    TO_IN (B)     INCLUDE (A+B)            (B)=GMI
2398  *                                                       Send Q(G,A-B)
2399  */
2400 static bool __grp_src_toin_incl(struct net_bridge_mcast *brmctx,
2401                                 struct net_bridge_mcast_port *pmctx,
2402                                 struct net_bridge_port_group *pg, void *h_addr,
2403                                 void *srcs, u32 nsrcs, size_t addr_size,
2404                                 int grec_type)
2405 {
2406         u32 src_idx, to_send = pg->src_ents;
2407         struct net_bridge_group_src *ent;
2408         unsigned long now = jiffies;
2409         bool changed = false;
2410         struct br_ip src_ip;
2411
2412         hlist_for_each_entry(ent, &pg->src_list, node)
2413                 ent->flags |= BR_SGRP_F_SEND;
2414
2415         memset(&src_ip, 0, sizeof(src_ip));
2416         src_ip.proto = pg->key.addr.proto;
2417         for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2418                 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2419                 ent = br_multicast_find_group_src(pg, &src_ip);
2420                 if (ent) {
2421                         ent->flags &= ~BR_SGRP_F_SEND;
2422                         to_send--;
2423                 } else {
2424                         ent = br_multicast_new_group_src(pg, &src_ip);
2425                         if (ent)
2426                                 changed = true;
2427                 }
2428                 if (ent)
2429                         __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx));
2430         }
2431
2432         if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2433                                     grec_type))
2434                 changed = true;
2435
2436         if (to_send)
2437                 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2438
2439         return changed;
2440 }
2441
2442 /* State          Msg type      New state                Actions
2443  * EXCLUDE (X,Y)  TO_IN (A)     EXCLUDE (X+A,Y-A)        (A)=GMI
2444  *                                                       Send Q(G,X-A)
2445  *                                                       Send Q(G)
2446  */
2447 static bool __grp_src_toin_excl(struct net_bridge_mcast *brmctx,
2448                                 struct net_bridge_mcast_port *pmctx,
2449                                 struct net_bridge_port_group *pg, void *h_addr,
2450                                 void *srcs, u32 nsrcs, size_t addr_size,
2451                                 int grec_type)
2452 {
2453         u32 src_idx, to_send = pg->src_ents;
2454         struct net_bridge_group_src *ent;
2455         unsigned long now = jiffies;
2456         bool changed = false;
2457         struct br_ip src_ip;
2458
2459         hlist_for_each_entry(ent, &pg->src_list, node)
2460                 if (timer_pending(&ent->timer))
2461                         ent->flags |= BR_SGRP_F_SEND;
2462
2463         memset(&src_ip, 0, sizeof(src_ip));
2464         src_ip.proto = pg->key.addr.proto;
2465         for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2466                 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2467                 ent = br_multicast_find_group_src(pg, &src_ip);
2468                 if (ent) {
2469                         if (timer_pending(&ent->timer)) {
2470                                 ent->flags &= ~BR_SGRP_F_SEND;
2471                                 to_send--;
2472                         }
2473                 } else {
2474                         ent = br_multicast_new_group_src(pg, &src_ip);
2475                         if (ent)
2476                                 changed = true;
2477                 }
2478                 if (ent)
2479                         __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx));
2480         }
2481
2482         if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2483                                     grec_type))
2484                 changed = true;
2485
2486         if (to_send)
2487                 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2488
2489         __grp_send_query_and_rexmit(brmctx, pmctx, pg);
2490
2491         return changed;
2492 }
2493
2494 static bool br_multicast_toin(struct net_bridge_mcast *brmctx,
2495                               struct net_bridge_mcast_port *pmctx,
2496                               struct net_bridge_port_group *pg, void *h_addr,
2497                               void *srcs, u32 nsrcs, size_t addr_size,
2498                               int grec_type)
2499 {
2500         bool changed = false;
2501
2502         switch (pg->filter_mode) {
2503         case MCAST_INCLUDE:
2504                 changed = __grp_src_toin_incl(brmctx, pmctx, pg, h_addr, srcs,
2505                                               nsrcs, addr_size, grec_type);
2506                 break;
2507         case MCAST_EXCLUDE:
2508                 changed = __grp_src_toin_excl(brmctx, pmctx, pg, h_addr, srcs,
2509                                               nsrcs, addr_size, grec_type);
2510                 break;
2511         }
2512
2513         if (br_multicast_eht_should_del_pg(pg)) {
2514                 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE;
2515                 br_multicast_find_del_pg(pg->key.port->br, pg);
2516                 /* a notification has already been sent and we shouldn't
2517                  * access pg after the delete so we have to return false
2518                  */
2519                 changed = false;
2520         }
2521
2522         return changed;
2523 }
2524
2525 /* State          Msg type      New state                Actions
2526  * INCLUDE (A)    TO_EX (B)     EXCLUDE (A*B,B-A)        (B-A)=0
2527  *                                                       Delete (A-B)
2528  *                                                       Send Q(G,A*B)
2529  *                                                       Group Timer=GMI
2530  */
2531 static void __grp_src_toex_incl(struct net_bridge_mcast *brmctx,
2532                                 struct net_bridge_mcast_port *pmctx,
2533                                 struct net_bridge_port_group *pg, void *h_addr,
2534                                 void *srcs, u32 nsrcs, size_t addr_size,
2535                                 int grec_type)
2536 {
2537         struct net_bridge_group_src *ent;
2538         u32 src_idx, to_send = 0;
2539         struct br_ip src_ip;
2540
2541         hlist_for_each_entry(ent, &pg->src_list, node)
2542                 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;
2543
2544         memset(&src_ip, 0, sizeof(src_ip));
2545         src_ip.proto = pg->key.addr.proto;
2546         for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2547                 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2548                 ent = br_multicast_find_group_src(pg, &src_ip);
2549                 if (ent) {
2550                         ent->flags = (ent->flags & ~BR_SGRP_F_DELETE) |
2551                                      BR_SGRP_F_SEND;
2552                         to_send++;
2553                 } else {
2554                         ent = br_multicast_new_group_src(pg, &src_ip);
2555                 }
2556                 if (ent)
2557                         br_multicast_fwd_src_handle(ent);
2558         }
2559
2560         br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2561                                 grec_type);
2562
2563         __grp_src_delete_marked(pg);
2564         if (to_send)
2565                 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2566 }
2567
2568 /* State          Msg type      New state                Actions
2569  * EXCLUDE (X,Y)  TO_EX (A)     EXCLUDE (A-Y,Y*A)        (A-X-Y)=Group Timer
2570  *                                                       Delete (X-A)
2571  *                                                       Delete (Y-A)
2572  *                                                       Send Q(G,A-Y)
2573  *                                                       Group Timer=GMI
2574  */
2575 static bool __grp_src_toex_excl(struct net_bridge_mcast *brmctx,
2576                                 struct net_bridge_mcast_port *pmctx,
2577                                 struct net_bridge_port_group *pg, void *h_addr,
2578                                 void *srcs, u32 nsrcs, size_t addr_size,
2579                                 int grec_type)
2580 {
2581         struct net_bridge_group_src *ent;
2582         u32 src_idx, to_send = 0;
2583         bool changed = false;
2584         struct br_ip src_ip;
2585
2586         hlist_for_each_entry(ent, &pg->src_list, node)
2587                 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE;
2588
2589         memset(&src_ip, 0, sizeof(src_ip));
2590         src_ip.proto = pg->key.addr.proto;
2591         for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2592                 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2593                 ent = br_multicast_find_group_src(pg, &src_ip);
2594                 if (ent) {
2595                         ent->flags &= ~BR_SGRP_F_DELETE;
2596                 } else {
2597                         ent = br_multicast_new_group_src(pg, &src_ip);
2598                         if (ent) {
2599                                 __grp_src_mod_timer(ent, pg->timer.expires);
2600                                 changed = true;
2601                         }
2602                 }
2603                 if (ent && timer_pending(&ent->timer)) {
2604                         ent->flags |= BR_SGRP_F_SEND;
2605                         to_send++;
2606                 }
2607         }
2608
2609         if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2610                                     grec_type))
2611                 changed = true;
2612
2613         if (__grp_src_delete_marked(pg))
2614                 changed = true;
2615         if (to_send)
2616                 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2617
2618         return changed;
2619 }
2620
2621 static bool br_multicast_toex(struct net_bridge_mcast *brmctx,
2622                               struct net_bridge_mcast_port *pmctx,
2623                               struct net_bridge_port_group *pg, void *h_addr,
2624                               void *srcs, u32 nsrcs, size_t addr_size,
2625                               int grec_type)
2626 {
2627         bool changed = false;
2628
2629         switch (pg->filter_mode) {
2630         case MCAST_INCLUDE:
2631                 __grp_src_toex_incl(brmctx, pmctx, pg, h_addr, srcs, nsrcs,
2632                                     addr_size, grec_type);
2633                 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE);
2634                 changed = true;
2635                 break;
2636         case MCAST_EXCLUDE:
2637                 changed = __grp_src_toex_excl(brmctx, pmctx, pg, h_addr, srcs,
2638                                               nsrcs, addr_size, grec_type);
2639                 break;
2640         }
2641
2642         pg->filter_mode = MCAST_EXCLUDE;
2643         mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx));
2644
2645         return changed;
2646 }
2647
2648 /* State          Msg type      New state                Actions
2649  * INCLUDE (A)    BLOCK (B)     INCLUDE (A)              Send Q(G,A*B)
2650  */
2651 static bool __grp_src_block_incl(struct net_bridge_mcast *brmctx,
2652                                  struct net_bridge_mcast_port *pmctx,
2653                                  struct net_bridge_port_group *pg, void *h_addr,
2654                                  void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
2655 {
2656         struct net_bridge_group_src *ent;
2657         u32 src_idx, to_send = 0;
2658         bool changed = false;
2659         struct br_ip src_ip;
2660
2661         hlist_for_each_entry(ent, &pg->src_list, node)
2662                 ent->flags &= ~BR_SGRP_F_SEND;
2663
2664         memset(&src_ip, 0, sizeof(src_ip));
2665         src_ip.proto = pg->key.addr.proto;
2666         for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2667                 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2668                 ent = br_multicast_find_group_src(pg, &src_ip);
2669                 if (ent) {
2670                         ent->flags |= BR_SGRP_F_SEND;
2671                         to_send++;
2672                 }
2673         }
2674
2675         if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2676                                     grec_type))
2677                 changed = true;
2678
2679         if (to_send)
2680                 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2681
2682         return changed;
2683 }
2684
2685 /* State          Msg type      New state                Actions
2686  * EXCLUDE (X,Y)  BLOCK (A)     EXCLUDE (X+(A-Y),Y)      (A-X-Y)=Group Timer
2687  *                                                       Send Q(G,A-Y)
2688  */
2689 static bool __grp_src_block_excl(struct net_bridge_mcast *brmctx,
2690                                  struct net_bridge_mcast_port *pmctx,
2691                                  struct net_bridge_port_group *pg, void *h_addr,
2692                                  void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
2693 {
2694         struct net_bridge_group_src *ent;
2695         u32 src_idx, to_send = 0;
2696         bool changed = false;
2697         struct br_ip src_ip;
2698
2699         hlist_for_each_entry(ent, &pg->src_list, node)
2700                 ent->flags &= ~BR_SGRP_F_SEND;
2701
2702         memset(&src_ip, 0, sizeof(src_ip));
2703         src_ip.proto = pg->key.addr.proto;
2704         for (src_idx = 0; src_idx < nsrcs; src_idx++) {
2705                 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
2706                 ent = br_multicast_find_group_src(pg, &src_ip);
2707                 if (!ent) {
2708                         ent = br_multicast_new_group_src(pg, &src_ip);
2709                         if (ent) {
2710                                 __grp_src_mod_timer(ent, pg->timer.expires);
2711                                 changed = true;
2712                         }
2713                 }
2714                 if (ent && timer_pending(&ent->timer)) {
2715                         ent->flags |= BR_SGRP_F_SEND;
2716                         to_send++;
2717                 }
2718         }
2719
2720         if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size,
2721                                     grec_type))
2722                 changed = true;
2723
2724         if (to_send)
2725                 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg);
2726
2727         return changed;
2728 }
2729
2730 static bool br_multicast_block(struct net_bridge_mcast *brmctx,
2731                                struct net_bridge_mcast_port *pmctx,
2732                                struct net_bridge_port_group *pg, void *h_addr,
2733                                void *srcs, u32 nsrcs, size_t addr_size, int grec_type)
2734 {
2735         bool changed = false;
2736
2737         switch (pg->filter_mode) {
2738         case MCAST_INCLUDE:
2739                 changed = __grp_src_block_incl(brmctx, pmctx, pg, h_addr, srcs,
2740                                                nsrcs, addr_size, grec_type);
2741                 break;
2742         case MCAST_EXCLUDE:
2743                 changed = __grp_src_block_excl(brmctx, pmctx, pg, h_addr, srcs,
2744                                                nsrcs, addr_size, grec_type);
2745                 break;
2746         }
2747
2748         if ((pg->filter_mode == MCAST_INCLUDE && hlist_empty(&pg->src_list)) ||
2749             br_multicast_eht_should_del_pg(pg)) {
2750                 if (br_multicast_eht_should_del_pg(pg))
2751                         pg->flags |= MDB_PG_FLAGS_FAST_LEAVE;
2752                 br_multicast_find_del_pg(pg->key.port->br, pg);
2753                 /* a notification has already been sent and we shouldn't
2754                  * access pg after the delete so we have to return false
2755                  */
2756                 changed = false;
2757         }
2758
2759         return changed;
2760 }
2761
2762 static struct net_bridge_port_group *
2763 br_multicast_find_port(struct net_bridge_mdb_entry *mp,
2764                        struct net_bridge_port *p,
2765                        const unsigned char *src)
2766 {
2767         struct net_bridge *br __maybe_unused = mp->br;
2768         struct net_bridge_port_group *pg;
2769
2770         for (pg = mlock_dereference(mp->ports, br);
2771              pg;
2772              pg = mlock_dereference(pg->next, br))
2773                 if (br_port_group_equal(pg, p, src))
2774                         return pg;
2775
2776         return NULL;
2777 }
2778
2779 static int br_ip4_multicast_igmp3_report(struct net_bridge_mcast *brmctx,
2780                                          struct net_bridge_mcast_port *pmctx,
2781                                          struct sk_buff *skb,
2782                                          u16 vid)
2783 {
2784         bool igmpv2 = brmctx->multicast_igmp_version == 2;
2785         struct net_bridge_mdb_entry *mdst;
2786         struct net_bridge_port_group *pg;
2787         const unsigned char *src;
2788         struct igmpv3_report *ih;
2789         struct igmpv3_grec *grec;
2790         int i, len, num, type;
2791         __be32 group, *h_addr;
2792         bool changed = false;
2793         int err = 0;
2794         u16 nsrcs;
2795
2796         ih = igmpv3_report_hdr(skb);
2797         num = ntohs(ih->ngrec);
2798         len = skb_transport_offset(skb) + sizeof(*ih);
2799
2800         for (i = 0; i < num; i++) {
2801                 len += sizeof(*grec);
2802                 if (!ip_mc_may_pull(skb, len))
2803                         return -EINVAL;
2804
2805                 grec = (void *)(skb->data + len - sizeof(*grec));
2806                 group = grec->grec_mca;
2807                 type = grec->grec_type;
2808                 nsrcs = ntohs(grec->grec_nsrcs);
2809
2810                 len += nsrcs * 4;
2811                 if (!ip_mc_may_pull(skb, len))
2812                         return -EINVAL;
2813
2814                 switch (type) {
2815                 case IGMPV3_MODE_IS_INCLUDE:
2816                 case IGMPV3_MODE_IS_EXCLUDE:
2817                 case IGMPV3_CHANGE_TO_INCLUDE:
2818                 case IGMPV3_CHANGE_TO_EXCLUDE:
2819                 case IGMPV3_ALLOW_NEW_SOURCES:
2820                 case IGMPV3_BLOCK_OLD_SOURCES:
2821                         break;
2822
2823                 default:
2824                         continue;
2825                 }
2826
2827                 src = eth_hdr(skb)->h_source;
2828                 if (nsrcs == 0 &&
2829                     (type == IGMPV3_CHANGE_TO_INCLUDE ||
2830                      type == IGMPV3_MODE_IS_INCLUDE)) {
2831                         if (!pmctx || igmpv2) {
2832                                 br_ip4_multicast_leave_group(brmctx, pmctx,
2833                                                              group, vid, src);
2834                                 continue;
2835                         }
2836                 } else {
2837                         err = br_ip4_multicast_add_group(brmctx, pmctx, group,
2838                                                          vid, src, igmpv2);
2839                         if (err)
2840                                 break;
2841                 }
2842
2843                 if (!pmctx || igmpv2)
2844                         continue;
2845
2846                 spin_lock(&brmctx->br->multicast_lock);
2847                 if (!br_multicast_ctx_should_use(brmctx, pmctx))
2848                         goto unlock_continue;
2849
2850                 mdst = br_mdb_ip4_get(brmctx->br, group, vid);
2851                 if (!mdst)
2852                         goto unlock_continue;
2853                 pg = br_multicast_find_port(mdst, pmctx->port, src);
2854                 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
2855                         goto unlock_continue;
2856                 /* reload grec and host addr */
2857                 grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4));
2858                 h_addr = &ip_hdr(skb)->saddr;
2859                 switch (type) {
2860                 case IGMPV3_ALLOW_NEW_SOURCES:
2861                         changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
2862                                                            grec->grec_src,
2863                                                            nsrcs, sizeof(__be32), type);
2864                         break;
2865                 case IGMPV3_MODE_IS_INCLUDE:
2866                         changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
2867                                                            grec->grec_src,
2868                                                            nsrcs, sizeof(__be32), type);
2869                         break;
2870                 case IGMPV3_MODE_IS_EXCLUDE:
2871                         changed = br_multicast_isexc(brmctx, pg, h_addr,
2872                                                      grec->grec_src,
2873                                                      nsrcs, sizeof(__be32), type);
2874                         break;
2875                 case IGMPV3_CHANGE_TO_INCLUDE:
2876                         changed = br_multicast_toin(brmctx, pmctx, pg, h_addr,
2877                                                     grec->grec_src,
2878                                                     nsrcs, sizeof(__be32), type);
2879                         break;
2880                 case IGMPV3_CHANGE_TO_EXCLUDE:
2881                         changed = br_multicast_toex(brmctx, pmctx, pg, h_addr,
2882                                                     grec->grec_src,
2883                                                     nsrcs, sizeof(__be32), type);
2884                         break;
2885                 case IGMPV3_BLOCK_OLD_SOURCES:
2886                         changed = br_multicast_block(brmctx, pmctx, pg, h_addr,
2887                                                      grec->grec_src,
2888                                                      nsrcs, sizeof(__be32), type);
2889                         break;
2890                 }
2891                 if (changed)
2892                         br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB);
2893 unlock_continue:
2894                 spin_unlock(&brmctx->br->multicast_lock);
2895         }
2896
2897         return err;
2898 }
2899
2900 #if IS_ENABLED(CONFIG_IPV6)
2901 static int br_ip6_multicast_mld2_report(struct net_bridge_mcast *brmctx,
2902                                         struct net_bridge_mcast_port *pmctx,
2903                                         struct sk_buff *skb,
2904                                         u16 vid)
2905 {
2906         bool mldv1 = brmctx->multicast_mld_version == 1;
2907         struct net_bridge_mdb_entry *mdst;
2908         struct net_bridge_port_group *pg;
2909         unsigned int nsrcs_offset;
2910         struct mld2_report *mld2r;
2911         const unsigned char *src;
2912         struct in6_addr *h_addr;
2913         struct mld2_grec *grec;
2914         unsigned int grec_len;
2915         bool changed = false;
2916         int i, len, num;
2917         int err = 0;
2918
2919         if (!ipv6_mc_may_pull(skb, sizeof(*mld2r)))
2920                 return -EINVAL;
2921
2922         mld2r = (struct mld2_report *)icmp6_hdr(skb);
2923         num = ntohs(mld2r->mld2r_ngrec);
2924         len = skb_transport_offset(skb) + sizeof(*mld2r);
2925
2926         for (i = 0; i < num; i++) {
2927                 __be16 *_nsrcs, __nsrcs;
2928                 u16 nsrcs;
2929
2930                 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
2931
2932                 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
2933                     nsrcs_offset + sizeof(__nsrcs))
2934                         return -EINVAL;
2935
2936                 _nsrcs = skb_header_pointer(skb, nsrcs_offset,
2937                                             sizeof(__nsrcs), &__nsrcs);
2938                 if (!_nsrcs)
2939                         return -EINVAL;
2940
2941                 nsrcs = ntohs(*_nsrcs);
2942                 grec_len = struct_size(grec, grec_src, nsrcs);
2943
2944                 if (!ipv6_mc_may_pull(skb, len + grec_len))
2945                         return -EINVAL;
2946
2947                 grec = (struct mld2_grec *)(skb->data + len);
2948                 len += grec_len;
2949
2950                 switch (grec->grec_type) {
2951                 case MLD2_MODE_IS_INCLUDE:
2952                 case MLD2_MODE_IS_EXCLUDE:
2953                 case MLD2_CHANGE_TO_INCLUDE:
2954                 case MLD2_CHANGE_TO_EXCLUDE:
2955                 case MLD2_ALLOW_NEW_SOURCES:
2956                 case MLD2_BLOCK_OLD_SOURCES:
2957                         break;
2958
2959                 default:
2960                         continue;
2961                 }
2962
2963                 src = eth_hdr(skb)->h_source;
2964                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
2965                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
2966                     nsrcs == 0) {
2967                         if (!pmctx || mldv1) {
2968                                 br_ip6_multicast_leave_group(brmctx, pmctx,
2969                                                              &grec->grec_mca,
2970                                                              vid, src);
2971                                 continue;
2972                         }
2973                 } else {
2974                         err = br_ip6_multicast_add_group(brmctx, pmctx,
2975                                                          &grec->grec_mca, vid,
2976                                                          src, mldv1);
2977                         if (err)
2978                                 break;
2979                 }
2980
2981                 if (!pmctx || mldv1)
2982                         continue;
2983
2984                 spin_lock(&brmctx->br->multicast_lock);
2985                 if (!br_multicast_ctx_should_use(brmctx, pmctx))
2986                         goto unlock_continue;
2987
2988                 mdst = br_mdb_ip6_get(brmctx->br, &grec->grec_mca, vid);
2989                 if (!mdst)
2990                         goto unlock_continue;
2991                 pg = br_multicast_find_port(mdst, pmctx->port, src);
2992                 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
2993                         goto unlock_continue;
2994                 h_addr = &ipv6_hdr(skb)->saddr;
2995                 switch (grec->grec_type) {
2996                 case MLD2_ALLOW_NEW_SOURCES:
2997                         changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
2998                                                            grec->grec_src, nsrcs,
2999                                                            sizeof(struct in6_addr),
3000                                                            grec->grec_type);
3001                         break;
3002                 case MLD2_MODE_IS_INCLUDE:
3003                         changed = br_multicast_isinc_allow(brmctx, pg, h_addr,
3004                                                            grec->grec_src, nsrcs,
3005                                                            sizeof(struct in6_addr),
3006                                                            grec->grec_type);
3007                         break;
3008                 case MLD2_MODE_IS_EXCLUDE:
3009                         changed = br_multicast_isexc(brmctx, pg, h_addr,
3010                                                      grec->grec_src, nsrcs,
3011                                                      sizeof(struct in6_addr),
3012                                                      grec->grec_type);
3013                         break;
3014                 case MLD2_CHANGE_TO_INCLUDE:
3015                         changed = br_multicast_toin(brmctx, pmctx, pg, h_addr,
3016                                                     grec->grec_src, nsrcs,
3017                                                     sizeof(struct in6_addr),
3018                                                     grec->grec_type);
3019                         break;
3020                 case MLD2_CHANGE_TO_EXCLUDE:
3021                         changed = br_multicast_toex(brmctx, pmctx, pg, h_addr,
3022                                                     grec->grec_src, nsrcs,
3023                                                     sizeof(struct in6_addr),
3024                                                     grec->grec_type);
3025                         break;
3026                 case MLD2_BLOCK_OLD_SOURCES:
3027                         changed = br_multicast_block(brmctx, pmctx, pg, h_addr,
3028                                                      grec->grec_src, nsrcs,
3029                                                      sizeof(struct in6_addr),
3030                                                      grec->grec_type);
3031                         break;
3032                 }
3033                 if (changed)
3034                         br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB);
3035 unlock_continue:
3036                 spin_unlock(&brmctx->br->multicast_lock);
3037         }
3038
3039         return err;
3040 }
3041 #endif
3042
3043 static bool br_multicast_select_querier(struct net_bridge_mcast *brmctx,
3044                                         struct net_bridge_mcast_port *pmctx,
3045                                         struct br_ip *saddr)
3046 {
3047         int port_ifidx = pmctx ? pmctx->port->dev->ifindex : 0;
3048         struct timer_list *own_timer, *other_timer;
3049         struct bridge_mcast_querier *querier;
3050
3051         switch (saddr->proto) {
3052         case htons(ETH_P_IP):
3053                 querier = &brmctx->ip4_querier;
3054                 own_timer = &brmctx->ip4_own_query.timer;
3055                 other_timer = &brmctx->ip4_other_query.timer;
3056                 if (!querier->addr.src.ip4 ||
3057                     ntohl(saddr->src.ip4) <= ntohl(querier->addr.src.ip4))
3058                         goto update;
3059                 break;
3060 #if IS_ENABLED(CONFIG_IPV6)
3061         case htons(ETH_P_IPV6):
3062                 querier = &brmctx->ip6_querier;
3063                 own_timer = &brmctx->ip6_own_query.timer;
3064                 other_timer = &brmctx->ip6_other_query.timer;
3065                 if (ipv6_addr_cmp(&saddr->src.ip6, &querier->addr.src.ip6) <= 0)
3066                         goto update;
3067                 break;
3068 #endif
3069         default:
3070                 return false;
3071         }
3072
3073         if (!timer_pending(own_timer) && !timer_pending(other_timer))
3074                 goto update;
3075
3076         return false;
3077
3078 update:
3079         br_multicast_update_querier(brmctx, querier, port_ifidx, saddr);
3080
3081         return true;
3082 }
3083
3084 static struct net_bridge_port *
3085 __br_multicast_get_querier_port(struct net_bridge *br,
3086                                 const struct bridge_mcast_querier *querier)
3087 {
3088         int port_ifidx = READ_ONCE(querier->port_ifidx);
3089         struct net_bridge_port *p;
3090         struct net_device *dev;
3091
3092         if (port_ifidx == 0)
3093                 return NULL;
3094
3095         dev = dev_get_by_index_rcu(dev_net(br->dev), port_ifidx);
3096         if (!dev)
3097                 return NULL;
3098         p = br_port_get_rtnl_rcu(dev);
3099         if (!p || p->br != br)
3100                 return NULL;
3101
3102         return p;
3103 }
3104
3105 size_t br_multicast_querier_state_size(void)
3106 {
3107         return nla_total_size(0) +              /* nest attribute */
3108                nla_total_size(sizeof(__be32)) + /* BRIDGE_QUERIER_IP_ADDRESS */
3109                nla_total_size(sizeof(int)) +    /* BRIDGE_QUERIER_IP_PORT */
3110                nla_total_size_64bit(sizeof(u64)) + /* BRIDGE_QUERIER_IP_OTHER_TIMER */
3111 #if IS_ENABLED(CONFIG_IPV6)
3112                nla_total_size(sizeof(struct in6_addr)) + /* BRIDGE_QUERIER_IPV6_ADDRESS */
3113                nla_total_size(sizeof(int)) +             /* BRIDGE_QUERIER_IPV6_PORT */
3114                nla_total_size_64bit(sizeof(u64)) +       /* BRIDGE_QUERIER_IPV6_OTHER_TIMER */
3115 #endif
3116                0;
3117 }
3118
3119 /* protected by rtnl or rcu */
3120 int br_multicast_dump_querier_state(struct sk_buff *skb,
3121                                     const struct net_bridge_mcast *brmctx,
3122                                     int nest_attr)
3123 {
3124         struct bridge_mcast_querier querier = {};
3125         struct net_bridge_port *p;
3126         struct nlattr *nest;
3127
3128         if (!br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) ||
3129             br_multicast_ctx_vlan_global_disabled(brmctx))
3130                 return 0;
3131
3132         nest = nla_nest_start(skb, nest_attr);
3133         if (!nest)
3134                 return -EMSGSIZE;
3135
3136         rcu_read_lock();
3137         if (!brmctx->multicast_querier &&
3138             !timer_pending(&brmctx->ip4_other_query.timer))
3139                 goto out_v6;
3140
3141         br_multicast_read_querier(&brmctx->ip4_querier, &querier);
3142         if (nla_put_in_addr(skb, BRIDGE_QUERIER_IP_ADDRESS,
3143                             querier.addr.src.ip4)) {
3144                 rcu_read_unlock();
3145                 goto out_err;
3146         }
3147
3148         p = __br_multicast_get_querier_port(brmctx->br, &querier);
3149         if (timer_pending(&brmctx->ip4_other_query.timer) &&
3150             (nla_put_u64_64bit(skb, BRIDGE_QUERIER_IP_OTHER_TIMER,
3151                                br_timer_value(&brmctx->ip4_other_query.timer),
3152                                BRIDGE_QUERIER_PAD) ||
3153              (p && nla_put_u32(skb, BRIDGE_QUERIER_IP_PORT, p->dev->ifindex)))) {
3154                 rcu_read_unlock();
3155                 goto out_err;
3156         }
3157
3158 out_v6:
3159 #if IS_ENABLED(CONFIG_IPV6)
3160         if (!brmctx->multicast_querier &&
3161             !timer_pending(&brmctx->ip6_other_query.timer))
3162                 goto out;
3163
3164         br_multicast_read_querier(&brmctx->ip6_querier, &querier);
3165         if (nla_put_in6_addr(skb, BRIDGE_QUERIER_IPV6_ADDRESS,
3166                              &querier.addr.src.ip6)) {
3167                 rcu_read_unlock();
3168                 goto out_err;
3169         }
3170
3171         p = __br_multicast_get_querier_port(brmctx->br, &querier);
3172         if (timer_pending(&brmctx->ip6_other_query.timer) &&
3173             (nla_put_u64_64bit(skb, BRIDGE_QUERIER_IPV6_OTHER_TIMER,
3174                                br_timer_value(&brmctx->ip6_other_query.timer),
3175                                BRIDGE_QUERIER_PAD) ||
3176              (p && nla_put_u32(skb, BRIDGE_QUERIER_IPV6_PORT,
3177                                p->dev->ifindex)))) {
3178                 rcu_read_unlock();
3179                 goto out_err;
3180         }
3181 out:
3182 #endif
3183         rcu_read_unlock();
3184         nla_nest_end(skb, nest);
3185         if (!nla_len(nest))
3186                 nla_nest_cancel(skb, nest);
3187
3188         return 0;
3189
3190 out_err:
3191         nla_nest_cancel(skb, nest);
3192         return -EMSGSIZE;
3193 }
3194
3195 static void
3196 br_multicast_update_query_timer(struct net_bridge_mcast *brmctx,
3197                                 struct bridge_mcast_other_query *query,
3198                                 unsigned long max_delay)
3199 {
3200         if (!timer_pending(&query->timer))
3201                 query->delay_time = jiffies + max_delay;
3202
3203         mod_timer(&query->timer, jiffies + brmctx->multicast_querier_interval);
3204 }
3205
3206 static void br_port_mc_router_state_change(struct net_bridge_port *p,
3207                                            bool is_mc_router)
3208 {
3209         struct switchdev_attr attr = {
3210                 .orig_dev = p->dev,
3211                 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
3212                 .flags = SWITCHDEV_F_DEFER,
3213                 .u.mrouter = is_mc_router,
3214         };
3215
3216         switchdev_port_attr_set(p->dev, &attr, NULL);
3217 }
3218
3219 static struct net_bridge_port *
3220 br_multicast_rport_from_node(struct net_bridge_mcast *brmctx,
3221                              struct hlist_head *mc_router_list,
3222                              struct hlist_node *rlist)
3223 {
3224         struct net_bridge_mcast_port *pmctx;
3225
3226 #if IS_ENABLED(CONFIG_IPV6)
3227         if (mc_router_list == &brmctx->ip6_mc_router_list)
3228                 pmctx = hlist_entry(rlist, struct net_bridge_mcast_port,
3229                                     ip6_rlist);
3230         else
3231 #endif
3232                 pmctx = hlist_entry(rlist, struct net_bridge_mcast_port,
3233                                     ip4_rlist);
3234
3235         return pmctx->port;
3236 }
3237
3238 static struct hlist_node *
3239 br_multicast_get_rport_slot(struct net_bridge_mcast *brmctx,
3240                             struct net_bridge_port *port,
3241                             struct hlist_head *mc_router_list)
3242
3243 {
3244         struct hlist_node *slot = NULL;
3245         struct net_bridge_port *p;
3246         struct hlist_node *rlist;
3247
3248         hlist_for_each(rlist, mc_router_list) {
3249                 p = br_multicast_rport_from_node(brmctx, mc_router_list, rlist);
3250
3251                 if ((unsigned long)port >= (unsigned long)p)
3252                         break;
3253
3254                 slot = rlist;
3255         }
3256
3257         return slot;
3258 }
3259
3260 static bool br_multicast_no_router_otherpf(struct net_bridge_mcast_port *pmctx,
3261                                            struct hlist_node *rnode)
3262 {
3263 #if IS_ENABLED(CONFIG_IPV6)
3264         if (rnode != &pmctx->ip6_rlist)
3265                 return hlist_unhashed(&pmctx->ip6_rlist);
3266         else
3267                 return hlist_unhashed(&pmctx->ip4_rlist);
3268 #else
3269         return true;
3270 #endif
3271 }
3272
3273 /* Add port to router_list
3274  *  list is maintained ordered by pointer value
3275  *  and locked by br->multicast_lock and RCU
3276  */
3277 static void br_multicast_add_router(struct net_bridge_mcast *brmctx,
3278                                     struct net_bridge_mcast_port *pmctx,
3279                                     struct hlist_node *rlist,
3280                                     struct hlist_head *mc_router_list)
3281 {
3282         struct hlist_node *slot;
3283
3284         if (!hlist_unhashed(rlist))
3285                 return;
3286
3287         slot = br_multicast_get_rport_slot(brmctx, pmctx->port, mc_router_list);
3288
3289         if (slot)
3290                 hlist_add_behind_rcu(rlist, slot);
3291         else
3292                 hlist_add_head_rcu(rlist, mc_router_list);
3293
3294         /* For backwards compatibility for now, only notify if we
3295          * switched from no IPv4/IPv6 multicast router to a new
3296          * IPv4 or IPv6 multicast router.
3297          */
3298         if (br_multicast_no_router_otherpf(pmctx, rlist)) {
3299                 br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_NEWMDB);
3300                 br_port_mc_router_state_change(pmctx->port, true);
3301         }
3302 }
3303
3304 /* Add port to router_list
3305  *  list is maintained ordered by pointer value
3306  *  and locked by br->multicast_lock and RCU
3307  */
3308 static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx,
3309                                         struct net_bridge_mcast_port *pmctx)
3310 {
3311         br_multicast_add_router(brmctx, pmctx, &pmctx->ip4_rlist,
3312                                 &brmctx->ip4_mc_router_list);
3313 }
3314
3315 /* Add port to router_list
3316  *  list is maintained ordered by pointer value
3317  *  and locked by br->multicast_lock and RCU
3318  */
3319 static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx,
3320                                         struct net_bridge_mcast_port *pmctx)
3321 {
3322 #if IS_ENABLED(CONFIG_IPV6)
3323         br_multicast_add_router(brmctx, pmctx, &pmctx->ip6_rlist,
3324                                 &brmctx->ip6_mc_router_list);
3325 #endif
3326 }
3327
3328 static void br_multicast_mark_router(struct net_bridge_mcast *brmctx,
3329                                      struct net_bridge_mcast_port *pmctx,
3330                                      struct timer_list *timer,
3331                                      struct hlist_node *rlist,
3332                                      struct hlist_head *mc_router_list)
3333 {
3334         unsigned long now = jiffies;
3335
3336         if (!br_multicast_ctx_should_use(brmctx, pmctx))
3337                 return;
3338
3339         if (!pmctx) {
3340                 if (brmctx->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
3341                         if (!br_ip4_multicast_is_router(brmctx) &&
3342                             !br_ip6_multicast_is_router(brmctx))
3343                                 br_mc_router_state_change(brmctx->br, true);
3344                         mod_timer(timer, now + brmctx->multicast_querier_interval);
3345                 }
3346                 return;
3347         }
3348
3349         if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED ||
3350             pmctx->multicast_router == MDB_RTR_TYPE_PERM)
3351                 return;
3352
3353         br_multicast_add_router(brmctx, pmctx, rlist, mc_router_list);
3354         mod_timer(timer, now + brmctx->multicast_querier_interval);
3355 }
3356
3357 static void br_ip4_multicast_mark_router(struct net_bridge_mcast *brmctx,
3358                                          struct net_bridge_mcast_port *pmctx)
3359 {
3360         struct timer_list *timer = &brmctx->ip4_mc_router_timer;
3361         struct hlist_node *rlist = NULL;
3362
3363         if (pmctx) {
3364                 timer = &pmctx->ip4_mc_router_timer;
3365                 rlist = &pmctx->ip4_rlist;
3366         }
3367
3368         br_multicast_mark_router(brmctx, pmctx, timer, rlist,
3369                                  &brmctx->ip4_mc_router_list);
3370 }
3371
3372 static void br_ip6_multicast_mark_router(struct net_bridge_mcast *brmctx,
3373                                          struct net_bridge_mcast_port *pmctx)
3374 {
3375 #if IS_ENABLED(CONFIG_IPV6)
3376         struct timer_list *timer = &brmctx->ip6_mc_router_timer;
3377         struct hlist_node *rlist = NULL;
3378
3379         if (pmctx) {
3380                 timer = &pmctx->ip6_mc_router_timer;
3381                 rlist = &pmctx->ip6_rlist;
3382         }
3383
3384         br_multicast_mark_router(brmctx, pmctx, timer, rlist,
3385                                  &brmctx->ip6_mc_router_list);
3386 #endif
3387 }
3388
3389 static void
3390 br_ip4_multicast_query_received(struct net_bridge_mcast *brmctx,
3391                                 struct net_bridge_mcast_port *pmctx,
3392                                 struct bridge_mcast_other_query *query,
3393                                 struct br_ip *saddr,
3394                                 unsigned long max_delay)
3395 {
3396         if (!br_multicast_select_querier(brmctx, pmctx, saddr))
3397                 return;
3398
3399         br_multicast_update_query_timer(brmctx, query, max_delay);
3400         br_ip4_multicast_mark_router(brmctx, pmctx);
3401 }
3402
3403 #if IS_ENABLED(CONFIG_IPV6)
3404 static void
3405 br_ip6_multicast_query_received(struct net_bridge_mcast *brmctx,
3406                                 struct net_bridge_mcast_port *pmctx,
3407                                 struct bridge_mcast_other_query *query,
3408                                 struct br_ip *saddr,
3409                                 unsigned long max_delay)
3410 {
3411         if (!br_multicast_select_querier(brmctx, pmctx, saddr))
3412                 return;
3413
3414         br_multicast_update_query_timer(brmctx, query, max_delay);
3415         br_ip6_multicast_mark_router(brmctx, pmctx);
3416 }
3417 #endif
3418
3419 static void br_ip4_multicast_query(struct net_bridge_mcast *brmctx,
3420                                    struct net_bridge_mcast_port *pmctx,
3421                                    struct sk_buff *skb,
3422                                    u16 vid)
3423 {
3424         unsigned int transport_len = ip_transport_len(skb);
3425         const struct iphdr *iph = ip_hdr(skb);
3426         struct igmphdr *ih = igmp_hdr(skb);
3427         struct net_bridge_mdb_entry *mp;
3428         struct igmpv3_query *ih3;
3429         struct net_bridge_port_group *p;
3430         struct net_bridge_port_group __rcu **pp;
3431         struct br_ip saddr = {};
3432         unsigned long max_delay;
3433         unsigned long now = jiffies;
3434         __be32 group;
3435
3436         spin_lock(&brmctx->br->multicast_lock);
3437         if (!br_multicast_ctx_should_use(brmctx, pmctx))
3438                 goto out;
3439
3440         group = ih->group;
3441
3442         if (transport_len == sizeof(*ih)) {
3443                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
3444
3445                 if (!max_delay) {
3446                         max_delay = 10 * HZ;
3447                         group = 0;
3448                 }
3449         } else if (transport_len >= sizeof(*ih3)) {
3450                 ih3 = igmpv3_query_hdr(skb);
3451                 if (ih3->nsrcs ||
3452                     (brmctx->multicast_igmp_version == 3 && group &&
3453                      ih3->suppress))
3454                         goto out;
3455
3456                 max_delay = ih3->code ?
3457                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
3458         } else {
3459                 goto out;
3460         }
3461
3462         if (!group) {
3463                 saddr.proto = htons(ETH_P_IP);
3464                 saddr.src.ip4 = iph->saddr;
3465
3466                 br_ip4_multicast_query_received(brmctx, pmctx,
3467                                                 &brmctx->ip4_other_query,
3468                                                 &saddr, max_delay);
3469                 goto out;
3470         }
3471
3472         mp = br_mdb_ip4_get(brmctx->br, group, vid);
3473         if (!mp)
3474                 goto out;
3475
3476         max_delay *= brmctx->multicast_last_member_count;
3477
3478         if (mp->host_joined &&
3479             (timer_pending(&mp->timer) ?
3480              time_after(mp->timer.expires, now + max_delay) :
3481              try_to_del_timer_sync(&mp->timer) >= 0))
3482                 mod_timer(&mp->timer, now + max_delay);
3483
3484         for (pp = &mp->ports;
3485              (p = mlock_dereference(*pp, brmctx->br)) != NULL;
3486              pp = &p->next) {
3487                 if (timer_pending(&p->timer) ?
3488                     time_after(p->timer.expires, now + max_delay) :
3489                     try_to_del_timer_sync(&p->timer) >= 0 &&
3490                     (brmctx->multicast_igmp_version == 2 ||
3491                      p->filter_mode == MCAST_EXCLUDE))
3492                         mod_timer(&p->timer, now + max_delay);
3493         }
3494
3495 out:
3496         spin_unlock(&brmctx->br->multicast_lock);
3497 }
3498
3499 #if IS_ENABLED(CONFIG_IPV6)
3500 static int br_ip6_multicast_query(struct net_bridge_mcast *brmctx,
3501                                   struct net_bridge_mcast_port *pmctx,
3502                                   struct sk_buff *skb,
3503                                   u16 vid)
3504 {
3505         unsigned int transport_len = ipv6_transport_len(skb);
3506         struct mld_msg *mld;
3507         struct net_bridge_mdb_entry *mp;
3508         struct mld2_query *mld2q;
3509         struct net_bridge_port_group *p;
3510         struct net_bridge_port_group __rcu **pp;
3511         struct br_ip saddr = {};
3512         unsigned long max_delay;
3513         unsigned long now = jiffies;
3514         unsigned int offset = skb_transport_offset(skb);
3515         const struct in6_addr *group = NULL;
3516         bool is_general_query;
3517         int err = 0;
3518
3519         spin_lock(&brmctx->br->multicast_lock);
3520         if (!br_multicast_ctx_should_use(brmctx, pmctx))
3521                 goto out;
3522
3523         if (transport_len == sizeof(*mld)) {
3524                 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
3525                         err = -EINVAL;
3526                         goto out;
3527                 }
3528                 mld = (struct mld_msg *) icmp6_hdr(skb);
3529                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
3530                 if (max_delay)
3531                         group = &mld->mld_mca;
3532         } else {
3533                 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
3534                         err = -EINVAL;
3535                         goto out;
3536                 }
3537                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
3538                 if (!mld2q->mld2q_nsrcs)
3539                         group = &mld2q->mld2q_mca;
3540                 if (brmctx->multicast_mld_version == 2 &&
3541                     !ipv6_addr_any(&mld2q->mld2q_mca) &&
3542                     mld2q->mld2q_suppress)
3543                         goto out;
3544
3545                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
3546         }
3547
3548         is_general_query = group && ipv6_addr_any(group);
3549
3550         if (is_general_query) {
3551                 saddr.proto = htons(ETH_P_IPV6);
3552                 saddr.src.ip6 = ipv6_hdr(skb)->saddr;
3553
3554                 br_ip6_multicast_query_received(brmctx, pmctx,
3555                                                 &brmctx->ip6_other_query,
3556                                                 &saddr, max_delay);
3557                 goto out;
3558         } else if (!group) {
3559                 goto out;
3560         }
3561
3562         mp = br_mdb_ip6_get(brmctx->br, group, vid);
3563         if (!mp)
3564                 goto out;
3565
3566         max_delay *= brmctx->multicast_last_member_count;
3567         if (mp->host_joined &&
3568             (timer_pending(&mp->timer) ?
3569              time_after(mp->timer.expires, now + max_delay) :
3570              try_to_del_timer_sync(&mp->timer) >= 0))
3571                 mod_timer(&mp->timer, now + max_delay);
3572
3573         for (pp = &mp->ports;
3574              (p = mlock_dereference(*pp, brmctx->br)) != NULL;
3575              pp = &p->next) {
3576                 if (timer_pending(&p->timer) ?
3577                     time_after(p->timer.expires, now + max_delay) :
3578                     try_to_del_timer_sync(&p->timer) >= 0 &&
3579                     (brmctx->multicast_mld_version == 1 ||
3580                      p->filter_mode == MCAST_EXCLUDE))
3581                         mod_timer(&p->timer, now + max_delay);
3582         }
3583
3584 out:
3585         spin_unlock(&brmctx->br->multicast_lock);
3586         return err;
3587 }
3588 #endif
3589
3590 static void
3591 br_multicast_leave_group(struct net_bridge_mcast *brmctx,
3592                          struct net_bridge_mcast_port *pmctx,
3593                          struct br_ip *group,
3594                          struct bridge_mcast_other_query *other_query,
3595                          struct bridge_mcast_own_query *own_query,
3596                          const unsigned char *src)
3597 {
3598         struct net_bridge_mdb_entry *mp;
3599         struct net_bridge_port_group *p;
3600         unsigned long now;
3601         unsigned long time;
3602
3603         spin_lock(&brmctx->br->multicast_lock);
3604         if (!br_multicast_ctx_should_use(brmctx, pmctx))
3605                 goto out;
3606
3607         mp = br_mdb_ip_get(brmctx->br, group);
3608         if (!mp)
3609                 goto out;
3610
3611         if (pmctx && (pmctx->port->flags & BR_MULTICAST_FAST_LEAVE)) {
3612                 struct net_bridge_port_group __rcu **pp;
3613
3614                 for (pp = &mp->ports;
3615                      (p = mlock_dereference(*pp, brmctx->br)) != NULL;
3616                      pp = &p->next) {
3617                         if (!br_port_group_equal(p, pmctx->port, src))
3618                                 continue;
3619
3620                         if (p->flags & MDB_PG_FLAGS_PERMANENT)
3621                                 break;
3622
3623                         p->flags |= MDB_PG_FLAGS_FAST_LEAVE;
3624                         br_multicast_del_pg(mp, p, pp);
3625                 }
3626                 goto out;
3627         }
3628
3629         if (timer_pending(&other_query->timer))
3630                 goto out;
3631
3632         if (brmctx->multicast_querier) {
3633                 __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &mp->addr,
3634                                           false, 0, NULL);
3635
3636                 time = jiffies + brmctx->multicast_last_member_count *
3637                                  brmctx->multicast_last_member_interval;
3638
3639                 mod_timer(&own_query->timer, time);
3640
3641                 for (p = mlock_dereference(mp->ports, brmctx->br);
3642                      p != NULL && pmctx != NULL;
3643                      p = mlock_dereference(p->next, brmctx->br)) {
3644                         if (!br_port_group_equal(p, pmctx->port, src))
3645                                 continue;
3646
3647                         if (!hlist_unhashed(&p->mglist) &&
3648                             (timer_pending(&p->timer) ?
3649                              time_after(p->timer.expires, time) :
3650                              try_to_del_timer_sync(&p->timer) >= 0)) {
3651                                 mod_timer(&p->timer, time);
3652                         }
3653
3654                         break;
3655                 }
3656         }
3657
3658         now = jiffies;
3659         time = now + brmctx->multicast_last_member_count *
3660                      brmctx->multicast_last_member_interval;
3661
3662         if (!pmctx) {
3663                 if (mp->host_joined &&
3664                     (timer_pending(&mp->timer) ?
3665                      time_after(mp->timer.expires, time) :
3666                      try_to_del_timer_sync(&mp->timer) >= 0)) {
3667                         mod_timer(&mp->timer, time);
3668                 }
3669
3670                 goto out;
3671         }
3672
3673         for (p = mlock_dereference(mp->ports, brmctx->br);
3674              p != NULL;
3675              p = mlock_dereference(p->next, brmctx->br)) {
3676                 if (p->key.port != pmctx->port)
3677                         continue;
3678
3679                 if (!hlist_unhashed(&p->mglist) &&
3680                     (timer_pending(&p->timer) ?
3681                      time_after(p->timer.expires, time) :
3682                      try_to_del_timer_sync(&p->timer) >= 0)) {
3683                         mod_timer(&p->timer, time);
3684                 }
3685
3686                 break;
3687         }
3688 out:
3689         spin_unlock(&brmctx->br->multicast_lock);
3690 }
3691
3692 static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx,
3693                                          struct net_bridge_mcast_port *pmctx,
3694                                          __be32 group,
3695                                          __u16 vid,
3696                                          const unsigned char *src)
3697 {
3698         struct br_ip br_group;
3699         struct bridge_mcast_own_query *own_query;
3700
3701         if (ipv4_is_local_multicast(group))
3702                 return;
3703
3704         own_query = pmctx ? &pmctx->ip4_own_query : &brmctx->ip4_own_query;
3705
3706         memset(&br_group, 0, sizeof(br_group));
3707         br_group.dst.ip4 = group;
3708         br_group.proto = htons(ETH_P_IP);
3709         br_group.vid = vid;
3710
3711         br_multicast_leave_group(brmctx, pmctx, &br_group,
3712                                  &brmctx->ip4_other_query,
3713                                  own_query, src);
3714 }
3715
3716 #if IS_ENABLED(CONFIG_IPV6)
3717 static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx,
3718                                          struct net_bridge_mcast_port *pmctx,
3719                                          const struct in6_addr *group,
3720                                          __u16 vid,
3721                                          const unsigned char *src)
3722 {
3723         struct br_ip br_group;
3724         struct bridge_mcast_own_query *own_query;
3725
3726         if (ipv6_addr_is_ll_all_nodes(group))
3727                 return;
3728
3729         own_query = pmctx ? &pmctx->ip6_own_query : &brmctx->ip6_own_query;
3730
3731         memset(&br_group, 0, sizeof(br_group));
3732         br_group.dst.ip6 = *group;
3733         br_group.proto = htons(ETH_P_IPV6);
3734         br_group.vid = vid;
3735
3736         br_multicast_leave_group(brmctx, pmctx, &br_group,
3737                                  &brmctx->ip6_other_query,
3738                                  own_query, src);
3739 }
3740 #endif
3741
3742 static void br_multicast_err_count(const struct net_bridge *br,
3743                                    const struct net_bridge_port *p,
3744                                    __be16 proto)
3745 {
3746         struct bridge_mcast_stats __percpu *stats;
3747         struct bridge_mcast_stats *pstats;
3748
3749         if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
3750                 return;
3751
3752         if (p)
3753                 stats = p->mcast_stats;
3754         else
3755                 stats = br->mcast_stats;
3756         if (WARN_ON(!stats))
3757                 return;
3758
3759         pstats = this_cpu_ptr(stats);
3760
3761         u64_stats_update_begin(&pstats->syncp);
3762         switch (proto) {
3763         case htons(ETH_P_IP):
3764                 pstats->mstats.igmp_parse_errors++;
3765                 break;
3766 #if IS_ENABLED(CONFIG_IPV6)
3767         case htons(ETH_P_IPV6):
3768                 pstats->mstats.mld_parse_errors++;
3769                 break;
3770 #endif
3771         }
3772         u64_stats_update_end(&pstats->syncp);
3773 }
3774
3775 static void br_multicast_pim(struct net_bridge_mcast *brmctx,
3776                              struct net_bridge_mcast_port *pmctx,
3777                              const struct sk_buff *skb)
3778 {
3779         unsigned int offset = skb_transport_offset(skb);
3780         struct pimhdr *pimhdr, _pimhdr;
3781
3782         pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
3783         if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
3784             pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
3785                 return;
3786
3787         spin_lock(&brmctx->br->multicast_lock);
3788         br_ip4_multicast_mark_router(brmctx, pmctx);
3789         spin_unlock(&brmctx->br->multicast_lock);
3790 }
3791
3792 static int br_ip4_multicast_mrd_rcv(struct net_bridge_mcast *brmctx,
3793                                     struct net_bridge_mcast_port *pmctx,
3794                                     struct sk_buff *skb)
3795 {
3796         if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
3797             igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
3798                 return -ENOMSG;
3799
3800         spin_lock(&brmctx->br->multicast_lock);
3801         br_ip4_multicast_mark_router(brmctx, pmctx);
3802         spin_unlock(&brmctx->br->multicast_lock);
3803
3804         return 0;
3805 }
3806
3807 static int br_multicast_ipv4_rcv(struct net_bridge_mcast *brmctx,
3808                                  struct net_bridge_mcast_port *pmctx,
3809                                  struct sk_buff *skb,
3810                                  u16 vid)
3811 {
3812         struct net_bridge_port *p = pmctx ? pmctx->port : NULL;
3813         const unsigned char *src;
3814         struct igmphdr *ih;
3815         int err;
3816
3817         err = ip_mc_check_igmp(skb);
3818
3819         if (err == -ENOMSG) {
3820                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
3821                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3822                 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
3823                         if (ip_hdr(skb)->protocol == IPPROTO_PIM)
3824                                 br_multicast_pim(brmctx, pmctx, skb);
3825                 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
3826                         br_ip4_multicast_mrd_rcv(brmctx, pmctx, skb);
3827                 }
3828
3829                 return 0;
3830         } else if (err < 0) {
3831                 br_multicast_err_count(brmctx->br, p, skb->protocol);
3832                 return err;
3833         }
3834
3835         ih = igmp_hdr(skb);
3836         src = eth_hdr(skb)->h_source;
3837         BR_INPUT_SKB_CB(skb)->igmp = ih->type;
3838
3839         switch (ih->type) {
3840         case IGMP_HOST_MEMBERSHIP_REPORT:
3841         case IGMPV2_HOST_MEMBERSHIP_REPORT:
3842                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3843                 err = br_ip4_multicast_add_group(brmctx, pmctx, ih->group, vid,
3844                                                  src, true);
3845                 break;
3846         case IGMPV3_HOST_MEMBERSHIP_REPORT:
3847                 err = br_ip4_multicast_igmp3_report(brmctx, pmctx, skb, vid);
3848                 break;
3849         case IGMP_HOST_MEMBERSHIP_QUERY:
3850                 br_ip4_multicast_query(brmctx, pmctx, skb, vid);
3851                 break;
3852         case IGMP_HOST_LEAVE_MESSAGE:
3853                 br_ip4_multicast_leave_group(brmctx, pmctx, ih->group, vid, src);
3854                 break;
3855         }
3856
3857         br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp,
3858                            BR_MCAST_DIR_RX);
3859
3860         return err;
3861 }
3862
3863 #if IS_ENABLED(CONFIG_IPV6)
3864 static void br_ip6_multicast_mrd_rcv(struct net_bridge_mcast *brmctx,
3865                                      struct net_bridge_mcast_port *pmctx,
3866                                      struct sk_buff *skb)
3867 {
3868         if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
3869                 return;
3870
3871         spin_lock(&brmctx->br->multicast_lock);
3872         br_ip6_multicast_mark_router(brmctx, pmctx);
3873         spin_unlock(&brmctx->br->multicast_lock);
3874 }
3875
3876 static int br_multicast_ipv6_rcv(struct net_bridge_mcast *brmctx,
3877                                  struct net_bridge_mcast_port *pmctx,
3878                                  struct sk_buff *skb,
3879                                  u16 vid)
3880 {
3881         struct net_bridge_port *p = pmctx ? pmctx->port : NULL;
3882         const unsigned char *src;
3883         struct mld_msg *mld;
3884         int err;
3885
3886         err = ipv6_mc_check_mld(skb);
3887
3888         if (err == -ENOMSG || err == -ENODATA) {
3889                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
3890                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3891                 if (err == -ENODATA &&
3892                     ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr))
3893                         br_ip6_multicast_mrd_rcv(brmctx, pmctx, skb);
3894
3895                 return 0;
3896         } else if (err < 0) {
3897                 br_multicast_err_count(brmctx->br, p, skb->protocol);
3898                 return err;
3899         }
3900
3901         mld = (struct mld_msg *)skb_transport_header(skb);
3902         BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
3903
3904         switch (mld->mld_type) {
3905         case ICMPV6_MGM_REPORT:
3906                 src = eth_hdr(skb)->h_source;
3907                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
3908                 err = br_ip6_multicast_add_group(brmctx, pmctx, &mld->mld_mca,
3909                                                  vid, src, true);
3910                 break;
3911         case ICMPV6_MLD2_REPORT:
3912                 err = br_ip6_multicast_mld2_report(brmctx, pmctx, skb, vid);
3913                 break;
3914         case ICMPV6_MGM_QUERY:
3915                 err = br_ip6_multicast_query(brmctx, pmctx, skb, vid);
3916                 break;
3917         case ICMPV6_MGM_REDUCTION:
3918                 src = eth_hdr(skb)->h_source;
3919                 br_ip6_multicast_leave_group(brmctx, pmctx, &mld->mld_mca, vid,
3920                                              src);
3921                 break;
3922         }
3923
3924         br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp,
3925                            BR_MCAST_DIR_RX);
3926
3927         return err;
3928 }
3929 #endif
3930
3931 int br_multicast_rcv(struct net_bridge_mcast **brmctx,
3932                      struct net_bridge_mcast_port **pmctx,
3933                      struct net_bridge_vlan *vlan,
3934                      struct sk_buff *skb, u16 vid)
3935 {
3936         int ret = 0;
3937
3938         BR_INPUT_SKB_CB(skb)->igmp = 0;
3939         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
3940
3941         if (!br_opt_get((*brmctx)->br, BROPT_MULTICAST_ENABLED))
3942                 return 0;
3943
3944         if (br_opt_get((*brmctx)->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) && vlan) {
3945                 const struct net_bridge_vlan *masterv;
3946
3947                 /* the vlan has the master flag set only when transmitting
3948                  * through the bridge device
3949                  */
3950                 if (br_vlan_is_master(vlan)) {
3951                         masterv = vlan;
3952                         *brmctx = &vlan->br_mcast_ctx;
3953                         *pmctx = NULL;
3954                 } else {
3955                         masterv = vlan->brvlan;
3956                         *brmctx = &vlan->brvlan->br_mcast_ctx;
3957                         *pmctx = &vlan->port_mcast_ctx;
3958                 }
3959
3960                 if (!(masterv->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED))
3961                         return 0;
3962         }
3963
3964         switch (skb->protocol) {
3965         case htons(ETH_P_IP):
3966                 ret = br_multicast_ipv4_rcv(*brmctx, *pmctx, skb, vid);
3967                 break;
3968 #if IS_ENABLED(CONFIG_IPV6)
3969         case htons(ETH_P_IPV6):
3970                 ret = br_multicast_ipv6_rcv(*brmctx, *pmctx, skb, vid);
3971                 break;
3972 #endif
3973         }
3974
3975         return ret;
3976 }
3977
3978 static void br_multicast_query_expired(struct net_bridge_mcast *brmctx,
3979                                        struct bridge_mcast_own_query *query,
3980                                        struct bridge_mcast_querier *querier)
3981 {
3982         spin_lock(&brmctx->br->multicast_lock);
3983         if (br_multicast_ctx_vlan_disabled(brmctx))
3984                 goto out;
3985
3986         if (query->startup_sent < brmctx->multicast_startup_query_count)
3987                 query->startup_sent++;
3988
3989         br_multicast_send_query(brmctx, NULL, query);
3990 out:
3991         spin_unlock(&brmctx->br->multicast_lock);
3992 }
3993
3994 static void br_ip4_multicast_query_expired(struct timer_list *t)
3995 {
3996         struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
3997                                                      ip4_own_query.timer);
3998
3999         br_multicast_query_expired(brmctx, &brmctx->ip4_own_query,
4000                                    &brmctx->ip4_querier);
4001 }
4002
4003 #if IS_ENABLED(CONFIG_IPV6)
4004 static void br_ip6_multicast_query_expired(struct timer_list *t)
4005 {
4006         struct net_bridge_mcast *brmctx = from_timer(brmctx, t,
4007                                                      ip6_own_query.timer);
4008
4009         br_multicast_query_expired(brmctx, &brmctx->ip6_own_query,
4010                                    &brmctx->ip6_querier);
4011 }
4012 #endif
4013
4014 static void br_multicast_gc_work(struct work_struct *work)
4015 {
4016         struct net_bridge *br = container_of(work, struct net_bridge,
4017                                              mcast_gc_work);
4018         HLIST_HEAD(deleted_head);
4019
4020         spin_lock_bh(&br->multicast_lock);
4021         hlist_move_list(&br->mcast_gc_list, &deleted_head);
4022         spin_unlock_bh(&br->multicast_lock);
4023
4024         br_multicast_gc(&deleted_head);
4025 }
4026
4027 void br_multicast_ctx_init(struct net_bridge *br,
4028                            struct net_bridge_vlan *vlan,
4029                            struct net_bridge_mcast *brmctx)
4030 {
4031         brmctx->br = br;
4032         brmctx->vlan = vlan;
4033         brmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
4034         brmctx->multicast_last_member_count = 2;
4035         brmctx->multicast_startup_query_count = 2;
4036
4037         brmctx->multicast_last_member_interval = HZ;
4038         brmctx->multicast_query_response_interval = 10 * HZ;
4039         brmctx->multicast_startup_query_interval = 125 * HZ / 4;
4040         brmctx->multicast_query_interval = 125 * HZ;
4041         brmctx->multicast_querier_interval = 255 * HZ;
4042         brmctx->multicast_membership_interval = 260 * HZ;
4043
4044         brmctx->ip4_other_query.delay_time = 0;
4045         brmctx->ip4_querier.port_ifidx = 0;
4046         seqcount_spinlock_init(&brmctx->ip4_querier.seq, &br->multicast_lock);
4047         brmctx->multicast_igmp_version = 2;
4048 #if IS_ENABLED(CONFIG_IPV6)
4049         brmctx->multicast_mld_version = 1;
4050         brmctx->ip6_other_query.delay_time = 0;
4051         brmctx->ip6_querier.port_ifidx = 0;
4052         seqcount_spinlock_init(&brmctx->ip6_querier.seq, &br->multicast_lock);
4053 #endif
4054
4055         timer_setup(&brmctx->ip4_mc_router_timer,
4056                     br_ip4_multicast_local_router_expired, 0);
4057         timer_setup(&brmctx->ip4_other_query.timer,
4058                     br_ip4_multicast_querier_expired, 0);
4059         timer_setup(&brmctx->ip4_own_query.timer,
4060                     br_ip4_multicast_query_expired, 0);
4061 #if IS_ENABLED(CONFIG_IPV6)
4062         timer_setup(&brmctx->ip6_mc_router_timer,
4063                     br_ip6_multicast_local_router_expired, 0);
4064         timer_setup(&brmctx->ip6_other_query.timer,
4065                     br_ip6_multicast_querier_expired, 0);
4066         timer_setup(&brmctx->ip6_own_query.timer,
4067                     br_ip6_multicast_query_expired, 0);
4068 #endif
4069 }
4070
4071 void br_multicast_ctx_deinit(struct net_bridge_mcast *brmctx)
4072 {
4073         __br_multicast_stop(brmctx);
4074 }
4075
4076 void br_multicast_init(struct net_bridge *br)
4077 {
4078         br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
4079
4080         br_multicast_ctx_init(br, NULL, &br->multicast_ctx);
4081
4082         br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
4083         br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
4084
4085         spin_lock_init(&br->multicast_lock);
4086         INIT_HLIST_HEAD(&br->mdb_list);
4087         INIT_HLIST_HEAD(&br->mcast_gc_list);
4088         INIT_WORK(&br->mcast_gc_work, br_multicast_gc_work);
4089 }
4090
4091 static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
4092 {
4093         struct in_device *in_dev = in_dev_get(br->dev);
4094
4095         if (!in_dev)
4096                 return;
4097
4098         __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
4099         in_dev_put(in_dev);
4100 }
4101
4102 #if IS_ENABLED(CONFIG_IPV6)
4103 static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
4104 {
4105         struct in6_addr addr;
4106
4107         ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
4108         ipv6_dev_mc_inc(br->dev, &addr);
4109 }
4110 #else
4111 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
4112 {
4113 }
4114 #endif
4115
4116 void br_multicast_join_snoopers(struct net_bridge *br)
4117 {
4118         br_ip4_multicast_join_snoopers(br);
4119         br_ip6_multicast_join_snoopers(br);
4120 }
4121
4122 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
4123 {
4124         struct in_device *in_dev = in_dev_get(br->dev);
4125
4126         if (WARN_ON(!in_dev))
4127                 return;
4128
4129         __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
4130         in_dev_put(in_dev);
4131 }
4132
4133 #if IS_ENABLED(CONFIG_IPV6)
4134 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
4135 {
4136         struct in6_addr addr;
4137
4138         ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
4139         ipv6_dev_mc_dec(br->dev, &addr);
4140 }
4141 #else
4142 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
4143 {
4144 }
4145 #endif
4146
4147 void br_multicast_leave_snoopers(struct net_bridge *br)
4148 {
4149         br_ip4_multicast_leave_snoopers(br);
4150         br_ip6_multicast_leave_snoopers(br);
4151 }
4152
4153 static void __br_multicast_open_query(struct net_bridge *br,
4154                                       struct bridge_mcast_own_query *query)
4155 {
4156         query->startup_sent = 0;
4157
4158         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
4159                 return;
4160
4161         mod_timer(&query->timer, jiffies);
4162 }
4163
4164 static void __br_multicast_open(struct net_bridge_mcast *brmctx)
4165 {
4166         __br_multicast_open_query(brmctx->br, &brmctx->ip4_own_query);
4167 #if IS_ENABLED(CONFIG_IPV6)
4168         __br_multicast_open_query(brmctx->br, &brmctx->ip6_own_query);
4169 #endif
4170 }
4171
4172 void br_multicast_open(struct net_bridge *br)
4173 {
4174         ASSERT_RTNL();
4175
4176         if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
4177                 struct net_bridge_vlan_group *vg;
4178                 struct net_bridge_vlan *vlan;
4179
4180                 vg = br_vlan_group(br);
4181                 if (vg) {
4182                         list_for_each_entry(vlan, &vg->vlan_list, vlist) {
4183                                 struct net_bridge_mcast *brmctx;
4184
4185                                 brmctx = &vlan->br_mcast_ctx;
4186                                 if (br_vlan_is_brentry(vlan) &&
4187                                     !br_multicast_ctx_vlan_disabled(brmctx))
4188                                         __br_multicast_open(&vlan->br_mcast_ctx);
4189                         }
4190                 }
4191         } else {
4192                 __br_multicast_open(&br->multicast_ctx);
4193         }
4194 }
4195
4196 static void __br_multicast_stop(struct net_bridge_mcast *brmctx)
4197 {
4198         del_timer_sync(&brmctx->ip4_mc_router_timer);
4199         del_timer_sync(&brmctx->ip4_other_query.timer);
4200         del_timer_sync(&brmctx->ip4_own_query.timer);
4201 #if IS_ENABLED(CONFIG_IPV6)
4202         del_timer_sync(&brmctx->ip6_mc_router_timer);
4203         del_timer_sync(&brmctx->ip6_other_query.timer);
4204         del_timer_sync(&brmctx->ip6_own_query.timer);
4205 #endif
4206 }
4207
4208 void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on)
4209 {
4210         struct net_bridge *br;
4211
4212         /* it's okay to check for the flag without the multicast lock because it
4213          * can only change under RTNL -> multicast_lock, we need the latter to
4214          * sync with timers and packets
4215          */
4216         if (on == !!(vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED))
4217                 return;
4218
4219         if (br_vlan_is_master(vlan)) {
4220                 br = vlan->br;
4221
4222                 if (!br_vlan_is_brentry(vlan) ||
4223                     (on &&
4224                      br_multicast_ctx_vlan_global_disabled(&vlan->br_mcast_ctx)))
4225                         return;
4226
4227                 spin_lock_bh(&br->multicast_lock);
4228                 vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED;
4229                 spin_unlock_bh(&br->multicast_lock);
4230
4231                 if (on)
4232                         __br_multicast_open(&vlan->br_mcast_ctx);
4233                 else
4234                         __br_multicast_stop(&vlan->br_mcast_ctx);
4235         } else {
4236                 struct net_bridge_mcast *brmctx;
4237
4238                 brmctx = br_multicast_port_ctx_get_global(&vlan->port_mcast_ctx);
4239                 if (on && br_multicast_ctx_vlan_global_disabled(brmctx))
4240                         return;
4241
4242                 br = vlan->port->br;
4243                 spin_lock_bh(&br->multicast_lock);
4244                 vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED;
4245                 if (on)
4246                         __br_multicast_enable_port_ctx(&vlan->port_mcast_ctx);
4247                 else
4248                         __br_multicast_disable_port_ctx(&vlan->port_mcast_ctx);
4249                 spin_unlock_bh(&br->multicast_lock);
4250         }
4251 }
4252
4253 static void br_multicast_toggle_vlan(struct net_bridge_vlan *vlan, bool on)
4254 {
4255         struct net_bridge_port *p;
4256
4257         if (WARN_ON_ONCE(!br_vlan_is_master(vlan)))
4258                 return;
4259
4260         list_for_each_entry(p, &vlan->br->port_list, list) {
4261                 struct net_bridge_vlan *vport;
4262
4263                 vport = br_vlan_find(nbp_vlan_group(p), vlan->vid);
4264                 if (!vport)
4265                         continue;
4266                 br_multicast_toggle_one_vlan(vport, on);
4267         }
4268
4269         if (br_vlan_is_brentry(vlan))
4270                 br_multicast_toggle_one_vlan(vlan, on);
4271 }
4272
4273 int br_multicast_toggle_vlan_snooping(struct net_bridge *br, bool on,
4274                                       struct netlink_ext_ack *extack)
4275 {
4276         struct net_bridge_vlan_group *vg;
4277         struct net_bridge_vlan *vlan;
4278         struct net_bridge_port *p;
4279
4280         if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) == on)
4281                 return 0;
4282
4283         if (on && !br_opt_get(br, BROPT_VLAN_ENABLED)) {
4284                 NL_SET_ERR_MSG_MOD(extack, "Cannot enable multicast vlan snooping with vlan filtering disabled");
4285                 return -EINVAL;
4286         }
4287
4288         vg = br_vlan_group(br);
4289         if (!vg)
4290                 return 0;
4291
4292         br_opt_toggle(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED, on);
4293
4294         /* disable/enable non-vlan mcast contexts based on vlan snooping */
4295         if (on)
4296                 __br_multicast_stop(&br->multicast_ctx);
4297         else
4298                 __br_multicast_open(&br->multicast_ctx);
4299         list_for_each_entry(p, &br->port_list, list) {
4300                 if (on)
4301                         br_multicast_disable_port(p);
4302                 else
4303                         br_multicast_enable_port(p);
4304         }
4305
4306         list_for_each_entry(vlan, &vg->vlan_list, vlist)
4307                 br_multicast_toggle_vlan(vlan, on);
4308
4309         return 0;
4310 }
4311
4312 bool br_multicast_toggle_global_vlan(struct net_bridge_vlan *vlan, bool on)
4313 {
4314         ASSERT_RTNL();
4315
4316         /* BR_VLFLAG_GLOBAL_MCAST_ENABLED relies on eventual consistency and
4317          * requires only RTNL to change
4318          */
4319         if (on == !!(vlan->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED))
4320                 return false;
4321
4322         vlan->priv_flags ^= BR_VLFLAG_GLOBAL_MCAST_ENABLED;
4323         br_multicast_toggle_vlan(vlan, on);
4324
4325         return true;
4326 }
4327
4328 void br_multicast_stop(struct net_bridge *br)
4329 {
4330         ASSERT_RTNL();
4331
4332         if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
4333                 struct net_bridge_vlan_group *vg;
4334                 struct net_bridge_vlan *vlan;
4335
4336                 vg = br_vlan_group(br);
4337                 if (vg) {
4338                         list_for_each_entry(vlan, &vg->vlan_list, vlist) {
4339                                 struct net_bridge_mcast *brmctx;
4340
4341                                 brmctx = &vlan->br_mcast_ctx;
4342                                 if (br_vlan_is_brentry(vlan) &&
4343                                     !br_multicast_ctx_vlan_disabled(brmctx))
4344                                         __br_multicast_stop(&vlan->br_mcast_ctx);
4345                         }
4346                 }
4347         } else {
4348                 __br_multicast_stop(&br->multicast_ctx);
4349         }
4350 }
4351
4352 void br_multicast_dev_del(struct net_bridge *br)
4353 {
4354         struct net_bridge_mdb_entry *mp;
4355         HLIST_HEAD(deleted_head);
4356         struct hlist_node *tmp;
4357
4358         spin_lock_bh(&br->multicast_lock);
4359         hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node)
4360                 br_multicast_del_mdb_entry(mp);
4361         hlist_move_list(&br->mcast_gc_list, &deleted_head);
4362         spin_unlock_bh(&br->multicast_lock);
4363
4364         br_multicast_ctx_deinit(&br->multicast_ctx);
4365         br_multicast_gc(&deleted_head);
4366         cancel_work_sync(&br->mcast_gc_work);
4367
4368         rcu_barrier();
4369 }
4370
4371 int br_multicast_set_router(struct net_bridge_mcast *brmctx, unsigned long val)
4372 {
4373         int err = -EINVAL;
4374
4375         spin_lock_bh(&brmctx->br->multicast_lock);
4376
4377         switch (val) {
4378         case MDB_RTR_TYPE_DISABLED:
4379         case MDB_RTR_TYPE_PERM:
4380                 br_mc_router_state_change(brmctx->br, val == MDB_RTR_TYPE_PERM);
4381                 del_timer(&brmctx->ip4_mc_router_timer);
4382 #if IS_ENABLED(CONFIG_IPV6)
4383                 del_timer(&brmctx->ip6_mc_router_timer);
4384 #endif
4385                 brmctx->multicast_router = val;
4386                 err = 0;
4387                 break;
4388         case MDB_RTR_TYPE_TEMP_QUERY:
4389                 if (brmctx->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
4390                         br_mc_router_state_change(brmctx->br, false);
4391                 brmctx->multicast_router = val;
4392                 err = 0;
4393                 break;
4394         }
4395
4396         spin_unlock_bh(&brmctx->br->multicast_lock);
4397
4398         return err;
4399 }
4400
4401 static void
4402 br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted)
4403 {
4404         if (!deleted)
4405                 return;
4406
4407         /* For backwards compatibility for now, only notify if there is
4408          * no multicast router anymore for both IPv4 and IPv6.
4409          */
4410         if (!hlist_unhashed(&pmctx->ip4_rlist))
4411                 return;
4412 #if IS_ENABLED(CONFIG_IPV6)
4413         if (!hlist_unhashed(&pmctx->ip6_rlist))
4414                 return;
4415 #endif
4416
4417         br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_DELMDB);
4418         br_port_mc_router_state_change(pmctx->port, false);
4419
4420         /* don't allow timer refresh */
4421         if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP)
4422                 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
4423 }
4424
4425 int br_multicast_set_port_router(struct net_bridge_mcast_port *pmctx,
4426                                  unsigned long val)
4427 {
4428         struct net_bridge_mcast *brmctx;
4429         unsigned long now = jiffies;
4430         int err = -EINVAL;
4431         bool del = false;
4432
4433         brmctx = br_multicast_port_ctx_get_global(pmctx);
4434         spin_lock_bh(&brmctx->br->multicast_lock);
4435         if (pmctx->multicast_router == val) {
4436                 /* Refresh the temp router port timer */
4437                 if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP) {
4438                         mod_timer(&pmctx->ip4_mc_router_timer,
4439                                   now + brmctx->multicast_querier_interval);
4440 #if IS_ENABLED(CONFIG_IPV6)
4441                         mod_timer(&pmctx->ip6_mc_router_timer,
4442                                   now + brmctx->multicast_querier_interval);
4443 #endif
4444                 }
4445                 err = 0;
4446                 goto unlock;
4447         }
4448         switch (val) {
4449         case MDB_RTR_TYPE_DISABLED:
4450                 pmctx->multicast_router = MDB_RTR_TYPE_DISABLED;
4451                 del |= br_ip4_multicast_rport_del(pmctx);
4452                 del_timer(&pmctx->ip4_mc_router_timer);
4453                 del |= br_ip6_multicast_rport_del(pmctx);
4454 #if IS_ENABLED(CONFIG_IPV6)
4455                 del_timer(&pmctx->ip6_mc_router_timer);
4456 #endif
4457                 br_multicast_rport_del_notify(pmctx, del);
4458                 break;
4459         case MDB_RTR_TYPE_TEMP_QUERY:
4460                 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
4461                 del |= br_ip4_multicast_rport_del(pmctx);
4462                 del |= br_ip6_multicast_rport_del(pmctx);
4463                 br_multicast_rport_del_notify(pmctx, del);
4464                 break;
4465         case MDB_RTR_TYPE_PERM:
4466                 pmctx->multicast_router = MDB_RTR_TYPE_PERM;
4467                 del_timer(&pmctx->ip4_mc_router_timer);
4468                 br_ip4_multicast_add_router(brmctx, pmctx);
4469 #if IS_ENABLED(CONFIG_IPV6)
4470                 del_timer(&pmctx->ip6_mc_router_timer);
4471 #endif
4472                 br_ip6_multicast_add_router(brmctx, pmctx);
4473                 break;
4474         case MDB_RTR_TYPE_TEMP:
4475                 pmctx->multicast_router = MDB_RTR_TYPE_TEMP;
4476                 br_ip4_multicast_mark_router(brmctx, pmctx);
4477                 br_ip6_multicast_mark_router(brmctx, pmctx);
4478                 break;
4479         default:
4480                 goto unlock;
4481         }
4482         err = 0;
4483 unlock:
4484         spin_unlock_bh(&brmctx->br->multicast_lock);
4485
4486         return err;
4487 }
4488
4489 int br_multicast_set_vlan_router(struct net_bridge_vlan *v, u8 mcast_router)
4490 {
4491         int err;
4492
4493         if (br_vlan_is_master(v))
4494                 err = br_multicast_set_router(&v->br_mcast_ctx, mcast_router);
4495         else
4496                 err = br_multicast_set_port_router(&v->port_mcast_ctx,
4497                                                    mcast_router);
4498
4499         return err;
4500 }
4501
4502 static void br_multicast_start_querier(struct net_bridge_mcast *brmctx,
4503                                        struct bridge_mcast_own_query *query)
4504 {
4505         struct net_bridge_port *port;
4506
4507         if (!br_multicast_ctx_matches_vlan_snooping(brmctx))
4508                 return;
4509
4510         __br_multicast_open_query(brmctx->br, query);
4511
4512         rcu_read_lock();
4513         list_for_each_entry_rcu(port, &brmctx->br->port_list, list) {
4514                 struct bridge_mcast_own_query *ip4_own_query;
4515 #if IS_ENABLED(CONFIG_IPV6)
4516                 struct bridge_mcast_own_query *ip6_own_query;
4517 #endif
4518
4519                 if (br_multicast_port_ctx_state_stopped(&port->multicast_ctx))
4520                         continue;
4521
4522                 if (br_multicast_ctx_is_vlan(brmctx)) {
4523                         struct net_bridge_vlan *vlan;
4524
4525                         vlan = br_vlan_find(nbp_vlan_group_rcu(port),
4526                                             brmctx->vlan->vid);
4527                         if (!vlan ||
4528                             br_multicast_port_ctx_state_stopped(&vlan->port_mcast_ctx))
4529                                 continue;
4530
4531                         ip4_own_query = &vlan->port_mcast_ctx.ip4_own_query;
4532 #if IS_ENABLED(CONFIG_IPV6)
4533                         ip6_own_query = &vlan->port_mcast_ctx.ip6_own_query;
4534 #endif
4535                 } else {
4536                         ip4_own_query = &port->multicast_ctx.ip4_own_query;
4537 #if IS_ENABLED(CONFIG_IPV6)
4538                         ip6_own_query = &port->multicast_ctx.ip6_own_query;
4539 #endif
4540                 }
4541
4542                 if (query == &brmctx->ip4_own_query)
4543                         br_multicast_enable(ip4_own_query);
4544 #if IS_ENABLED(CONFIG_IPV6)
4545                 else
4546                         br_multicast_enable(ip6_own_query);
4547 #endif
4548         }
4549         rcu_read_unlock();
4550 }
4551
4552 int br_multicast_toggle(struct net_bridge *br, unsigned long val,
4553                         struct netlink_ext_ack *extack)
4554 {
4555         struct net_bridge_port *port;
4556         bool change_snoopers = false;
4557         int err = 0;
4558
4559         spin_lock_bh(&br->multicast_lock);
4560         if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
4561                 goto unlock;
4562
4563         err = br_mc_disabled_update(br->dev, val, extack);
4564         if (err == -EOPNOTSUPP)
4565                 err = 0;
4566         if (err)
4567                 goto unlock;
4568
4569         br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
4570         if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
4571                 change_snoopers = true;
4572                 goto unlock;
4573         }
4574
4575         if (!netif_running(br->dev))
4576                 goto unlock;
4577
4578         br_multicast_open(br);
4579         list_for_each_entry(port, &br->port_list, list)
4580                 __br_multicast_enable_port_ctx(&port->multicast_ctx);
4581
4582         change_snoopers = true;
4583
4584 unlock:
4585         spin_unlock_bh(&br->multicast_lock);
4586
4587         /* br_multicast_join_snoopers has the potential to cause
4588          * an MLD Report/Leave to be delivered to br_multicast_rcv,
4589          * which would in turn call br_multicast_add_group, which would
4590          * attempt to acquire multicast_lock. This function should be
4591          * called after the lock has been released to avoid deadlocks on
4592          * multicast_lock.
4593          *
4594          * br_multicast_leave_snoopers does not have the problem since
4595          * br_multicast_rcv first checks BROPT_MULTICAST_ENABLED, and
4596          * returns without calling br_multicast_ipv4/6_rcv if it's not
4597          * enabled. Moved both functions out just for symmetry.
4598          */
4599         if (change_snoopers) {
4600                 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
4601                         br_multicast_join_snoopers(br);
4602                 else
4603                         br_multicast_leave_snoopers(br);
4604         }
4605
4606         return err;
4607 }
4608
4609 bool br_multicast_enabled(const struct net_device *dev)
4610 {
4611         struct net_bridge *br = netdev_priv(dev);
4612
4613         return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
4614 }
4615 EXPORT_SYMBOL_GPL(br_multicast_enabled);
4616
4617 bool br_multicast_router(const struct net_device *dev)
4618 {
4619         struct net_bridge *br = netdev_priv(dev);
4620         bool is_router;
4621
4622         spin_lock_bh(&br->multicast_lock);
4623         is_router = br_multicast_is_router(&br->multicast_ctx, NULL);
4624         spin_unlock_bh(&br->multicast_lock);
4625         return is_router;
4626 }
4627 EXPORT_SYMBOL_GPL(br_multicast_router);
4628
4629 int br_multicast_set_querier(struct net_bridge_mcast *brmctx, unsigned long val)
4630 {
4631         unsigned long max_delay;
4632
4633         val = !!val;
4634
4635         spin_lock_bh(&brmctx->br->multicast_lock);
4636         if (brmctx->multicast_querier == val)
4637                 goto unlock;
4638
4639         WRITE_ONCE(brmctx->multicast_querier, val);
4640         if (!val)
4641                 goto unlock;
4642
4643         max_delay = brmctx->multicast_query_response_interval;
4644
4645         if (!timer_pending(&brmctx->ip4_other_query.timer))
4646                 brmctx->ip4_other_query.delay_time = jiffies + max_delay;
4647
4648         br_multicast_start_querier(brmctx, &brmctx->ip4_own_query);
4649
4650 #if IS_ENABLED(CONFIG_IPV6)
4651         if (!timer_pending(&brmctx->ip6_other_query.timer))
4652                 brmctx->ip6_other_query.delay_time = jiffies + max_delay;
4653
4654         br_multicast_start_querier(brmctx, &brmctx->ip6_own_query);
4655 #endif
4656
4657 unlock:
4658         spin_unlock_bh(&brmctx->br->multicast_lock);
4659
4660         return 0;
4661 }
4662
4663 int br_multicast_set_igmp_version(struct net_bridge_mcast *brmctx,
4664                                   unsigned long val)
4665 {
4666         /* Currently we support only version 2 and 3 */
4667         switch (val) {
4668         case 2:
4669         case 3:
4670                 break;
4671         default:
4672                 return -EINVAL;
4673         }
4674
4675         spin_lock_bh(&brmctx->br->multicast_lock);
4676         brmctx->multicast_igmp_version = val;
4677         spin_unlock_bh(&brmctx->br->multicast_lock);
4678
4679         return 0;
4680 }
4681
4682 #if IS_ENABLED(CONFIG_IPV6)
4683 int br_multicast_set_mld_version(struct net_bridge_mcast *brmctx,
4684                                  unsigned long val)
4685 {
4686         /* Currently we support version 1 and 2 */
4687         switch (val) {
4688         case 1:
4689         case 2:
4690                 break;
4691         default:
4692                 return -EINVAL;
4693         }
4694
4695         spin_lock_bh(&brmctx->br->multicast_lock);
4696         brmctx->multicast_mld_version = val;
4697         spin_unlock_bh(&brmctx->br->multicast_lock);
4698
4699         return 0;
4700 }
4701 #endif
4702
4703 void br_multicast_set_query_intvl(struct net_bridge_mcast *brmctx,
4704                                   unsigned long val)
4705 {
4706         unsigned long intvl_jiffies = clock_t_to_jiffies(val);
4707
4708         if (intvl_jiffies < BR_MULTICAST_QUERY_INTVL_MIN) {
4709                 br_info(brmctx->br,
4710                         "trying to set multicast query interval below minimum, setting to %lu (%ums)\n",
4711                         jiffies_to_clock_t(BR_MULTICAST_QUERY_INTVL_MIN),
4712                         jiffies_to_msecs(BR_MULTICAST_QUERY_INTVL_MIN));
4713                 intvl_jiffies = BR_MULTICAST_QUERY_INTVL_MIN;
4714         }
4715
4716         brmctx->multicast_query_interval = intvl_jiffies;
4717 }
4718
4719 void br_multicast_set_startup_query_intvl(struct net_bridge_mcast *brmctx,
4720                                           unsigned long val)
4721 {
4722         unsigned long intvl_jiffies = clock_t_to_jiffies(val);
4723
4724         if (intvl_jiffies < BR_MULTICAST_STARTUP_QUERY_INTVL_MIN) {
4725                 br_info(brmctx->br,
4726                         "trying to set multicast startup query interval below minimum, setting to %lu (%ums)\n",
4727                         jiffies_to_clock_t(BR_MULTICAST_STARTUP_QUERY_INTVL_MIN),
4728                         jiffies_to_msecs(BR_MULTICAST_STARTUP_QUERY_INTVL_MIN));
4729                 intvl_jiffies = BR_MULTICAST_STARTUP_QUERY_INTVL_MIN;
4730         }
4731
4732         brmctx->multicast_startup_query_interval = intvl_jiffies;
4733 }
4734
4735 /**
4736  * br_multicast_list_adjacent - Returns snooped multicast addresses
4737  * @dev:        The bridge port adjacent to which to retrieve addresses
4738  * @br_ip_list: The list to store found, snooped multicast IP addresses in
4739  *
4740  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
4741  * snooping feature on all bridge ports of dev's bridge device, excluding
4742  * the addresses from dev itself.
4743  *
4744  * Returns the number of items added to br_ip_list.
4745  *
4746  * Notes:
4747  * - br_ip_list needs to be initialized by caller
4748  * - br_ip_list might contain duplicates in the end
4749  *   (needs to be taken care of by caller)
4750  * - br_ip_list needs to be freed by caller
4751  */
4752 int br_multicast_list_adjacent(struct net_device *dev,
4753                                struct list_head *br_ip_list)
4754 {
4755         struct net_bridge *br;
4756         struct net_bridge_port *port;
4757         struct net_bridge_port_group *group;
4758         struct br_ip_list *entry;
4759         int count = 0;
4760
4761         rcu_read_lock();
4762         if (!br_ip_list || !netif_is_bridge_port(dev))
4763                 goto unlock;
4764
4765         port = br_port_get_rcu(dev);
4766         if (!port || !port->br)
4767                 goto unlock;
4768
4769         br = port->br;
4770
4771         list_for_each_entry_rcu(port, &br->port_list, list) {
4772                 if (!port->dev || port->dev == dev)
4773                         continue;
4774
4775                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
4776                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
4777                         if (!entry)
4778                                 goto unlock;
4779
4780                         entry->addr = group->key.addr;
4781                         list_add(&entry->list, br_ip_list);
4782                         count++;
4783                 }
4784         }
4785
4786 unlock:
4787         rcu_read_unlock();
4788         return count;
4789 }
4790 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
4791
4792 /**
4793  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
4794  * @dev: The bridge port providing the bridge on which to check for a querier
4795  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
4796  *
4797  * Checks whether the given interface has a bridge on top and if so returns
4798  * true if a valid querier exists anywhere on the bridged link layer.
4799  * Otherwise returns false.
4800  */
4801 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
4802 {
4803         struct net_bridge *br;
4804         struct net_bridge_port *port;
4805         struct ethhdr eth;
4806         bool ret = false;
4807
4808         rcu_read_lock();
4809         if (!netif_is_bridge_port(dev))
4810                 goto unlock;
4811
4812         port = br_port_get_rcu(dev);
4813         if (!port || !port->br)
4814                 goto unlock;
4815
4816         br = port->br;
4817
4818         memset(&eth, 0, sizeof(eth));
4819         eth.h_proto = htons(proto);
4820
4821         ret = br_multicast_querier_exists(&br->multicast_ctx, &eth, NULL);
4822
4823 unlock:
4824         rcu_read_unlock();
4825         return ret;
4826 }
4827 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
4828
4829 /**
4830  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
4831  * @dev: The bridge port adjacent to which to check for a querier
4832  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
4833  *
4834  * Checks whether the given interface has a bridge on top and if so returns
4835  * true if a selected querier is behind one of the other ports of this
4836  * bridge. Otherwise returns false.
4837  */
4838 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
4839 {
4840         struct net_bridge_mcast *brmctx;
4841         struct net_bridge *br;
4842         struct net_bridge_port *port;
4843         bool ret = false;
4844         int port_ifidx;
4845
4846         rcu_read_lock();
4847         if (!netif_is_bridge_port(dev))
4848                 goto unlock;
4849
4850         port = br_port_get_rcu(dev);
4851         if (!port || !port->br)
4852                 goto unlock;
4853
4854         br = port->br;
4855         brmctx = &br->multicast_ctx;
4856
4857         switch (proto) {
4858         case ETH_P_IP:
4859                 port_ifidx = brmctx->ip4_querier.port_ifidx;
4860                 if (!timer_pending(&brmctx->ip4_other_query.timer) ||
4861                     port_ifidx == port->dev->ifindex)
4862                         goto unlock;
4863                 break;
4864 #if IS_ENABLED(CONFIG_IPV6)
4865         case ETH_P_IPV6:
4866                 port_ifidx = brmctx->ip6_querier.port_ifidx;
4867                 if (!timer_pending(&brmctx->ip6_other_query.timer) ||
4868                     port_ifidx == port->dev->ifindex)
4869                         goto unlock;
4870                 break;
4871 #endif
4872         default:
4873                 goto unlock;
4874         }
4875
4876         ret = true;
4877 unlock:
4878         rcu_read_unlock();
4879         return ret;
4880 }
4881 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
4882
4883 /**
4884  * br_multicast_has_router_adjacent - Checks for a router behind a bridge port
4885  * @dev: The bridge port adjacent to which to check for a multicast router
4886  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
4887  *
4888  * Checks whether the given interface has a bridge on top and if so returns
4889  * true if a multicast router is behind one of the other ports of this
4890  * bridge. Otherwise returns false.
4891  */
4892 bool br_multicast_has_router_adjacent(struct net_device *dev, int proto)
4893 {
4894         struct net_bridge_mcast_port *pmctx;
4895         struct net_bridge_mcast *brmctx;
4896         struct net_bridge_port *port;
4897         bool ret = false;
4898
4899         rcu_read_lock();
4900         port = br_port_get_check_rcu(dev);
4901         if (!port)
4902                 goto unlock;
4903
4904         brmctx = &port->br->multicast_ctx;
4905         switch (proto) {
4906         case ETH_P_IP:
4907                 hlist_for_each_entry_rcu(pmctx, &brmctx->ip4_mc_router_list,
4908                                          ip4_rlist) {
4909                         if (pmctx->port == port)
4910                                 continue;
4911
4912                         ret = true;
4913                         goto unlock;
4914                 }
4915                 break;
4916 #if IS_ENABLED(CONFIG_IPV6)
4917         case ETH_P_IPV6:
4918                 hlist_for_each_entry_rcu(pmctx, &brmctx->ip6_mc_router_list,
4919                                          ip6_rlist) {
4920                         if (pmctx->port == port)
4921                                 continue;
4922
4923                         ret = true;
4924                         goto unlock;
4925                 }
4926                 break;
4927 #endif
4928         default:
4929                 /* when compiled without IPv6 support, be conservative and
4930                  * always assume presence of an IPv6 multicast router
4931                  */
4932                 ret = true;
4933         }
4934
4935 unlock:
4936         rcu_read_unlock();
4937         return ret;
4938 }
4939 EXPORT_SYMBOL_GPL(br_multicast_has_router_adjacent);
4940
4941 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
4942                                const struct sk_buff *skb, u8 type, u8 dir)
4943 {
4944         struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
4945         __be16 proto = skb->protocol;
4946         unsigned int t_len;
4947
4948         u64_stats_update_begin(&pstats->syncp);
4949         switch (proto) {
4950         case htons(ETH_P_IP):
4951                 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
4952                 switch (type) {
4953                 case IGMP_HOST_MEMBERSHIP_REPORT:
4954                         pstats->mstats.igmp_v1reports[dir]++;
4955                         break;
4956                 case IGMPV2_HOST_MEMBERSHIP_REPORT:
4957                         pstats->mstats.igmp_v2reports[dir]++;
4958                         break;
4959                 case IGMPV3_HOST_MEMBERSHIP_REPORT:
4960                         pstats->mstats.igmp_v3reports[dir]++;
4961                         break;
4962                 case IGMP_HOST_MEMBERSHIP_QUERY:
4963                         if (t_len != sizeof(struct igmphdr)) {
4964                                 pstats->mstats.igmp_v3queries[dir]++;
4965                         } else {
4966                                 unsigned int offset = skb_transport_offset(skb);
4967                                 struct igmphdr *ih, _ihdr;
4968
4969                                 ih = skb_header_pointer(skb, offset,
4970                                                         sizeof(_ihdr), &_ihdr);
4971                                 if (!ih)
4972                                         break;
4973                                 if (!ih->code)
4974                                         pstats->mstats.igmp_v1queries[dir]++;
4975                                 else
4976                                         pstats->mstats.igmp_v2queries[dir]++;
4977                         }
4978                         break;
4979                 case IGMP_HOST_LEAVE_MESSAGE:
4980                         pstats->mstats.igmp_leaves[dir]++;
4981                         break;
4982                 }
4983                 break;
4984 #if IS_ENABLED(CONFIG_IPV6)
4985         case htons(ETH_P_IPV6):
4986                 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
4987                         sizeof(struct ipv6hdr);
4988                 t_len -= skb_network_header_len(skb);
4989                 switch (type) {
4990                 case ICMPV6_MGM_REPORT:
4991                         pstats->mstats.mld_v1reports[dir]++;
4992                         break;
4993                 case ICMPV6_MLD2_REPORT:
4994                         pstats->mstats.mld_v2reports[dir]++;
4995                         break;
4996                 case ICMPV6_MGM_QUERY:
4997                         if (t_len != sizeof(struct mld_msg))
4998                                 pstats->mstats.mld_v2queries[dir]++;
4999                         else
5000                                 pstats->mstats.mld_v1queries[dir]++;
5001                         break;
5002                 case ICMPV6_MGM_REDUCTION:
5003                         pstats->mstats.mld_leaves[dir]++;
5004                         break;
5005                 }
5006                 break;
5007 #endif /* CONFIG_IPV6 */
5008         }
5009         u64_stats_update_end(&pstats->syncp);
5010 }
5011
5012 void br_multicast_count(struct net_bridge *br,
5013                         const struct net_bridge_port *p,
5014                         const struct sk_buff *skb, u8 type, u8 dir)
5015 {
5016         struct bridge_mcast_stats __percpu *stats;
5017
5018         /* if multicast_disabled is true then igmp type can't be set */
5019         if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
5020                 return;
5021
5022         if (p)
5023                 stats = p->mcast_stats;
5024         else
5025                 stats = br->mcast_stats;
5026         if (WARN_ON(!stats))
5027                 return;
5028
5029         br_mcast_stats_add(stats, skb, type, dir);
5030 }
5031
5032 int br_multicast_init_stats(struct net_bridge *br)
5033 {
5034         br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
5035         if (!br->mcast_stats)
5036                 return -ENOMEM;
5037
5038         return 0;
5039 }
5040
5041 void br_multicast_uninit_stats(struct net_bridge *br)
5042 {
5043         free_percpu(br->mcast_stats);
5044 }
5045
5046 /* noinline for https://bugs.llvm.org/show_bug.cgi?id=45802#c9 */
5047 static noinline_for_stack void mcast_stats_add_dir(u64 *dst, u64 *src)
5048 {
5049         dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
5050         dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
5051 }
5052
5053 void br_multicast_get_stats(const struct net_bridge *br,
5054                             const struct net_bridge_port *p,
5055                             struct br_mcast_stats *dest)
5056 {
5057         struct bridge_mcast_stats __percpu *stats;
5058         struct br_mcast_stats tdst;
5059         int i;
5060
5061         memset(dest, 0, sizeof(*dest));
5062         if (p)
5063                 stats = p->mcast_stats;
5064         else
5065                 stats = br->mcast_stats;
5066         if (WARN_ON(!stats))
5067                 return;
5068
5069         memset(&tdst, 0, sizeof(tdst));
5070         for_each_possible_cpu(i) {
5071                 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
5072                 struct br_mcast_stats temp;
5073                 unsigned int start;
5074
5075                 do {
5076                         start = u64_stats_fetch_begin(&cpu_stats->syncp);
5077                         memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
5078                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, start));
5079
5080                 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
5081                 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
5082                 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
5083                 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
5084                 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
5085                 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
5086                 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
5087                 tdst.igmp_parse_errors += temp.igmp_parse_errors;
5088
5089                 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
5090                 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
5091                 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
5092                 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
5093                 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
5094                 tdst.mld_parse_errors += temp.mld_parse_errors;
5095         }
5096         memcpy(dest, &tdst, sizeof(*dest));
5097 }
5098
5099 int br_mdb_hash_init(struct net_bridge *br)
5100 {
5101         int err;
5102
5103         err = rhashtable_init(&br->sg_port_tbl, &br_sg_port_rht_params);
5104         if (err)
5105                 return err;
5106
5107         err = rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
5108         if (err) {
5109                 rhashtable_destroy(&br->sg_port_tbl);
5110                 return err;
5111         }
5112
5113         return 0;
5114 }
5115
5116 void br_mdb_hash_fini(struct net_bridge *br)
5117 {
5118         rhashtable_destroy(&br->sg_port_tbl);
5119         rhashtable_destroy(&br->mdb_hash_tbl);
5120 }