1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Bridge multicast support. 4 * 5 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> 6 */ 7 8 #include <linux/err.h> 9 #include <linux/export.h> 10 #include <linux/if_ether.h> 11 #include <linux/igmp.h> 12 #include <linux/in.h> 13 #include <linux/jhash.h> 14 #include <linux/kernel.h> 15 #include <linux/log2.h> 16 #include <linux/netdevice.h> 17 #include <linux/netfilter_bridge.h> 18 #include <linux/random.h> 19 #include <linux/rculist.h> 20 #include <linux/skbuff.h> 21 #include <linux/slab.h> 22 #include <linux/timer.h> 23 #include <linux/inetdevice.h> 24 #include <linux/mroute.h> 25 #include <net/ip.h> 26 #include <net/switchdev.h> 27 #if IS_ENABLED(CONFIG_IPV6) 28 #include <linux/icmpv6.h> 29 #include <net/ipv6.h> 30 #include <net/mld.h> 31 #include <net/ip6_checksum.h> 32 #include <net/addrconf.h> 33 #endif 34 35 #include "br_private.h" 36 #include "br_private_mcast_eht.h" 37 38 static const struct rhashtable_params br_mdb_rht_params = { 39 .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode), 40 .key_offset = offsetof(struct net_bridge_mdb_entry, addr), 41 .key_len = sizeof(struct br_ip), 42 .automatic_shrinking = true, 43 }; 44 45 static const struct rhashtable_params br_sg_port_rht_params = { 46 .head_offset = offsetof(struct net_bridge_port_group, rhnode), 47 .key_offset = offsetof(struct net_bridge_port_group, key), 48 .key_len = sizeof(struct net_bridge_port_group_sg_key), 49 .automatic_shrinking = true, 50 }; 51 52 static void br_multicast_start_querier(struct net_bridge_mcast *brmctx, 53 struct bridge_mcast_own_query *query); 54 static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx, 55 struct net_bridge_mcast_port *pmctx); 56 static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx, 57 struct net_bridge_mcast_port *pmctx, 58 __be32 group, 59 __u16 vid, 60 const unsigned char *src); 61 static void br_multicast_port_group_rexmit(struct timer_list *t); 62 63 static void 64 br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted); 65 static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx, 66 struct net_bridge_mcast_port *pmctx); 67 #if IS_ENABLED(CONFIG_IPV6) 68 static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx, 69 struct net_bridge_mcast_port *pmctx, 70 const struct in6_addr *group, 71 __u16 vid, const unsigned char *src); 72 #endif 73 static struct net_bridge_port_group * 74 __br_multicast_add_group(struct net_bridge_mcast *brmctx, 75 struct net_bridge_mcast_port *pmctx, 76 struct br_ip *group, 77 const unsigned char *src, 78 u8 filter_mode, 79 bool igmpv2_mldv1, 80 bool blocked); 81 static void br_multicast_find_del_pg(struct net_bridge *br, 82 struct net_bridge_port_group *pg); 83 static void __br_multicast_stop(struct net_bridge_mcast *brmctx); 84 85 static struct net_bridge_port_group * 86 br_sg_port_find(struct net_bridge *br, 87 struct net_bridge_port_group_sg_key *sg_p) 88 { 89 lockdep_assert_held_once(&br->multicast_lock); 90 91 return rhashtable_lookup_fast(&br->sg_port_tbl, sg_p, 92 br_sg_port_rht_params); 93 } 94 95 static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br, 96 struct br_ip *dst) 97 { 98 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params); 99 } 100 101 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br, 102 struct br_ip *dst) 103 { 104 struct net_bridge_mdb_entry *ent; 105 106 lockdep_assert_held_once(&br->multicast_lock); 107 108 rcu_read_lock(); 109 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params); 110 rcu_read_unlock(); 111 112 return ent; 113 } 114 115 static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br, 116 __be32 dst, __u16 vid) 117 { 118 struct br_ip br_dst; 119 120 memset(&br_dst, 0, sizeof(br_dst)); 121 br_dst.dst.ip4 = dst; 122 br_dst.proto = htons(ETH_P_IP); 123 br_dst.vid = vid; 124 125 return br_mdb_ip_get(br, &br_dst); 126 } 127 128 #if IS_ENABLED(CONFIG_IPV6) 129 static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br, 130 const struct in6_addr *dst, 131 __u16 vid) 132 { 133 struct br_ip br_dst; 134 135 memset(&br_dst, 0, sizeof(br_dst)); 136 br_dst.dst.ip6 = *dst; 137 br_dst.proto = htons(ETH_P_IPV6); 138 br_dst.vid = vid; 139 140 return br_mdb_ip_get(br, &br_dst); 141 } 142 #endif 143 144 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge_mcast *brmctx, 145 struct sk_buff *skb, u16 vid) 146 { 147 struct net_bridge *br = brmctx->br; 148 struct br_ip ip; 149 150 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || 151 br_multicast_ctx_vlan_global_disabled(brmctx)) 152 return NULL; 153 154 if (BR_INPUT_SKB_CB(skb)->igmp) 155 return NULL; 156 157 memset(&ip, 0, sizeof(ip)); 158 ip.proto = skb->protocol; 159 ip.vid = vid; 160 161 switch (skb->protocol) { 162 case htons(ETH_P_IP): 163 ip.dst.ip4 = ip_hdr(skb)->daddr; 164 if (brmctx->multicast_igmp_version == 3) { 165 struct net_bridge_mdb_entry *mdb; 166 167 ip.src.ip4 = ip_hdr(skb)->saddr; 168 mdb = br_mdb_ip_get_rcu(br, &ip); 169 if (mdb) 170 return mdb; 171 ip.src.ip4 = 0; 172 } 173 break; 174 #if IS_ENABLED(CONFIG_IPV6) 175 case htons(ETH_P_IPV6): 176 ip.dst.ip6 = ipv6_hdr(skb)->daddr; 177 if (brmctx->multicast_mld_version == 2) { 178 struct net_bridge_mdb_entry *mdb; 179 180 ip.src.ip6 = ipv6_hdr(skb)->saddr; 181 mdb = br_mdb_ip_get_rcu(br, &ip); 182 if (mdb) 183 return mdb; 184 memset(&ip.src.ip6, 0, sizeof(ip.src.ip6)); 185 } 186 break; 187 #endif 188 default: 189 ip.proto = 0; 190 ether_addr_copy(ip.dst.mac_addr, eth_hdr(skb)->h_dest); 191 } 192 193 return br_mdb_ip_get_rcu(br, &ip); 194 } 195 196 /* IMPORTANT: this function must be used only when the contexts cannot be 197 * passed down (e.g. timer) and must be used for read-only purposes because 198 * the vlan snooping option can change, so it can return any context 199 * (non-vlan or vlan). Its initial intended purpose is to read timer values 200 * from the *current* context based on the option. At worst that could lead 201 * to inconsistent timers when the contexts are changed, i.e. src timer 202 * which needs to re-arm with a specific delay taken from the old context 203 */ 204 static struct net_bridge_mcast_port * 205 br_multicast_pg_to_port_ctx(const struct net_bridge_port_group *pg) 206 { 207 struct net_bridge_mcast_port *pmctx = &pg->key.port->multicast_ctx; 208 struct net_bridge_vlan *vlan; 209 210 lockdep_assert_held_once(&pg->key.port->br->multicast_lock); 211 212 /* if vlan snooping is disabled use the port's multicast context */ 213 if (!pg->key.addr.vid || 214 !br_opt_get(pg->key.port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) 215 goto out; 216 217 /* locking is tricky here, due to different rules for multicast and 218 * vlans we need to take rcu to find the vlan and make sure it has 219 * the BR_VLFLAG_MCAST_ENABLED flag set, it can only change under 220 * multicast_lock which must be already held here, so the vlan's pmctx 221 * can safely be used on return 222 */ 223 rcu_read_lock(); 224 vlan = br_vlan_find(nbp_vlan_group_rcu(pg->key.port), pg->key.addr.vid); 225 if (vlan && !br_multicast_port_ctx_vlan_disabled(&vlan->port_mcast_ctx)) 226 pmctx = &vlan->port_mcast_ctx; 227 else 228 pmctx = NULL; 229 rcu_read_unlock(); 230 out: 231 return pmctx; 232 } 233 234 /* when snooping we need to check if the contexts should be used 235 * in the following order: 236 * - if pmctx is non-NULL (port), check if it should be used 237 * - if pmctx is NULL (bridge), check if brmctx should be used 238 */ 239 static bool 240 br_multicast_ctx_should_use(const struct net_bridge_mcast *brmctx, 241 const struct net_bridge_mcast_port *pmctx) 242 { 243 if (!netif_running(brmctx->br->dev)) 244 return false; 245 246 if (pmctx) 247 return !br_multicast_port_ctx_state_disabled(pmctx); 248 else 249 return !br_multicast_ctx_vlan_disabled(brmctx); 250 } 251 252 static bool br_port_group_equal(struct net_bridge_port_group *p, 253 struct net_bridge_port *port, 254 const unsigned char *src) 255 { 256 if (p->key.port != port) 257 return false; 258 259 if (!(port->flags & BR_MULTICAST_TO_UNICAST)) 260 return true; 261 262 return ether_addr_equal(src, p->eth_addr); 263 } 264 265 static void __fwd_add_star_excl(struct net_bridge_mcast_port *pmctx, 266 struct net_bridge_port_group *pg, 267 struct br_ip *sg_ip) 268 { 269 struct net_bridge_port_group_sg_key sg_key; 270 struct net_bridge_port_group *src_pg; 271 struct net_bridge_mcast *brmctx; 272 273 memset(&sg_key, 0, sizeof(sg_key)); 274 brmctx = br_multicast_port_ctx_get_global(pmctx); 275 sg_key.port = pg->key.port; 276 sg_key.addr = *sg_ip; 277 if (br_sg_port_find(brmctx->br, &sg_key)) 278 return; 279 280 src_pg = __br_multicast_add_group(brmctx, pmctx, 281 sg_ip, pg->eth_addr, 282 MCAST_INCLUDE, false, false); 283 if (IS_ERR_OR_NULL(src_pg) || 284 src_pg->rt_protocol != RTPROT_KERNEL) 285 return; 286 287 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL; 288 } 289 290 static void __fwd_del_star_excl(struct net_bridge_port_group *pg, 291 struct br_ip *sg_ip) 292 { 293 struct net_bridge_port_group_sg_key sg_key; 294 struct net_bridge *br = pg->key.port->br; 295 struct net_bridge_port_group *src_pg; 296 297 memset(&sg_key, 0, sizeof(sg_key)); 298 sg_key.port = pg->key.port; 299 sg_key.addr = *sg_ip; 300 src_pg = br_sg_port_find(br, &sg_key); 301 if (!src_pg || !(src_pg->flags & MDB_PG_FLAGS_STAR_EXCL) || 302 src_pg->rt_protocol != RTPROT_KERNEL) 303 return; 304 305 br_multicast_find_del_pg(br, src_pg); 306 } 307 308 /* When a port group transitions to (or is added as) EXCLUDE we need to add it 309 * to all other ports' S,G entries which are not blocked by the current group 310 * for proper replication, the assumption is that any S,G blocked entries 311 * are already added so the S,G,port lookup should skip them. 312 * When a port group transitions from EXCLUDE -> INCLUDE mode or is being 313 * deleted we need to remove it from all ports' S,G entries where it was 314 * automatically installed before (i.e. where it's MDB_PG_FLAGS_STAR_EXCL). 315 */ 316 void br_multicast_star_g_handle_mode(struct net_bridge_port_group *pg, 317 u8 filter_mode) 318 { 319 struct net_bridge *br = pg->key.port->br; 320 struct net_bridge_port_group *pg_lst; 321 struct net_bridge_mcast_port *pmctx; 322 struct net_bridge_mdb_entry *mp; 323 struct br_ip sg_ip; 324 325 if (WARN_ON(!br_multicast_is_star_g(&pg->key.addr))) 326 return; 327 328 mp = br_mdb_ip_get(br, &pg->key.addr); 329 if (!mp) 330 return; 331 pmctx = br_multicast_pg_to_port_ctx(pg); 332 if (!pmctx) 333 return; 334 335 memset(&sg_ip, 0, sizeof(sg_ip)); 336 sg_ip = pg->key.addr; 337 338 for (pg_lst = mlock_dereference(mp->ports, br); 339 pg_lst; 340 pg_lst = mlock_dereference(pg_lst->next, br)) { 341 struct net_bridge_group_src *src_ent; 342 343 if (pg_lst == pg) 344 continue; 345 hlist_for_each_entry(src_ent, &pg_lst->src_list, node) { 346 if (!(src_ent->flags & BR_SGRP_F_INSTALLED)) 347 continue; 348 sg_ip.src = src_ent->addr.src; 349 switch (filter_mode) { 350 case MCAST_INCLUDE: 351 __fwd_del_star_excl(pg, &sg_ip); 352 break; 353 case MCAST_EXCLUDE: 354 __fwd_add_star_excl(pmctx, pg, &sg_ip); 355 break; 356 } 357 } 358 } 359 } 360 361 /* called when adding a new S,G with host_joined == false by default */ 362 static void br_multicast_sg_host_state(struct net_bridge_mdb_entry *star_mp, 363 struct net_bridge_port_group *sg) 364 { 365 struct net_bridge_mdb_entry *sg_mp; 366 367 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr))) 368 return; 369 if (!star_mp->host_joined) 370 return; 371 372 sg_mp = br_mdb_ip_get(star_mp->br, &sg->key.addr); 373 if (!sg_mp) 374 return; 375 sg_mp->host_joined = true; 376 } 377 378 /* set the host_joined state of all of *,G's S,G entries */ 379 static void br_multicast_star_g_host_state(struct net_bridge_mdb_entry *star_mp) 380 { 381 struct net_bridge *br = star_mp->br; 382 struct net_bridge_mdb_entry *sg_mp; 383 struct net_bridge_port_group *pg; 384 struct br_ip sg_ip; 385 386 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr))) 387 return; 388 389 memset(&sg_ip, 0, sizeof(sg_ip)); 390 sg_ip = star_mp->addr; 391 for (pg = mlock_dereference(star_mp->ports, br); 392 pg; 393 pg = mlock_dereference(pg->next, br)) { 394 struct net_bridge_group_src *src_ent; 395 396 hlist_for_each_entry(src_ent, &pg->src_list, node) { 397 if (!(src_ent->flags & BR_SGRP_F_INSTALLED)) 398 continue; 399 sg_ip.src = src_ent->addr.src; 400 sg_mp = br_mdb_ip_get(br, &sg_ip); 401 if (!sg_mp) 402 continue; 403 sg_mp->host_joined = star_mp->host_joined; 404 } 405 } 406 } 407 408 static void br_multicast_sg_del_exclude_ports(struct net_bridge_mdb_entry *sgmp) 409 { 410 struct net_bridge_port_group __rcu **pp; 411 struct net_bridge_port_group *p; 412 413 /* *,G exclude ports are only added to S,G entries */ 414 if (WARN_ON(br_multicast_is_star_g(&sgmp->addr))) 415 return; 416 417 /* we need the STAR_EXCLUDE ports if there are non-STAR_EXCLUDE ports 418 * we should ignore perm entries since they're managed by user-space 419 */ 420 for (pp = &sgmp->ports; 421 (p = mlock_dereference(*pp, sgmp->br)) != NULL; 422 pp = &p->next) 423 if (!(p->flags & (MDB_PG_FLAGS_STAR_EXCL | 424 MDB_PG_FLAGS_PERMANENT))) 425 return; 426 427 /* currently the host can only have joined the *,G which means 428 * we treat it as EXCLUDE {}, so for an S,G it's considered a 429 * STAR_EXCLUDE entry and we can safely leave it 430 */ 431 sgmp->host_joined = false; 432 433 for (pp = &sgmp->ports; 434 (p = mlock_dereference(*pp, sgmp->br)) != NULL;) { 435 if (!(p->flags & MDB_PG_FLAGS_PERMANENT)) 436 br_multicast_del_pg(sgmp, p, pp); 437 else 438 pp = &p->next; 439 } 440 } 441 442 void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp, 443 struct net_bridge_port_group *sg) 444 { 445 struct net_bridge_port_group_sg_key sg_key; 446 struct net_bridge *br = star_mp->br; 447 struct net_bridge_mcast_port *pmctx; 448 struct net_bridge_port_group *pg; 449 struct net_bridge_mcast *brmctx; 450 451 if (WARN_ON(br_multicast_is_star_g(&sg->key.addr))) 452 return; 453 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr))) 454 return; 455 456 br_multicast_sg_host_state(star_mp, sg); 457 memset(&sg_key, 0, sizeof(sg_key)); 458 sg_key.addr = sg->key.addr; 459 /* we need to add all exclude ports to the S,G */ 460 for (pg = mlock_dereference(star_mp->ports, br); 461 pg; 462 pg = mlock_dereference(pg->next, br)) { 463 struct net_bridge_port_group *src_pg; 464 465 if (pg == sg || pg->filter_mode == MCAST_INCLUDE) 466 continue; 467 468 sg_key.port = pg->key.port; 469 if (br_sg_port_find(br, &sg_key)) 470 continue; 471 472 pmctx = br_multicast_pg_to_port_ctx(pg); 473 if (!pmctx) 474 continue; 475 brmctx = br_multicast_port_ctx_get_global(pmctx); 476 477 src_pg = __br_multicast_add_group(brmctx, pmctx, 478 &sg->key.addr, 479 sg->eth_addr, 480 MCAST_INCLUDE, false, false); 481 if (IS_ERR_OR_NULL(src_pg) || 482 src_pg->rt_protocol != RTPROT_KERNEL) 483 continue; 484 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL; 485 } 486 } 487 488 static void br_multicast_fwd_src_add(struct net_bridge_group_src *src) 489 { 490 struct net_bridge_mdb_entry *star_mp; 491 struct net_bridge_mcast_port *pmctx; 492 struct net_bridge_port_group *sg; 493 struct net_bridge_mcast *brmctx; 494 struct br_ip sg_ip; 495 496 if (src->flags & BR_SGRP_F_INSTALLED) 497 return; 498 499 memset(&sg_ip, 0, sizeof(sg_ip)); 500 pmctx = br_multicast_pg_to_port_ctx(src->pg); 501 if (!pmctx) 502 return; 503 brmctx = br_multicast_port_ctx_get_global(pmctx); 504 sg_ip = src->pg->key.addr; 505 sg_ip.src = src->addr.src; 506 507 sg = __br_multicast_add_group(brmctx, pmctx, &sg_ip, 508 src->pg->eth_addr, MCAST_INCLUDE, false, 509 !timer_pending(&src->timer)); 510 if (IS_ERR_OR_NULL(sg)) 511 return; 512 src->flags |= BR_SGRP_F_INSTALLED; 513 sg->flags &= ~MDB_PG_FLAGS_STAR_EXCL; 514 515 /* if it was added by user-space as perm we can skip next steps */ 516 if (sg->rt_protocol != RTPROT_KERNEL && 517 (sg->flags & MDB_PG_FLAGS_PERMANENT)) 518 return; 519 520 /* the kernel is now responsible for removing this S,G */ 521 del_timer(&sg->timer); 522 star_mp = br_mdb_ip_get(src->br, &src->pg->key.addr); 523 if (!star_mp) 524 return; 525 526 br_multicast_sg_add_exclude_ports(star_mp, sg); 527 } 528 529 static void br_multicast_fwd_src_remove(struct net_bridge_group_src *src, 530 bool fastleave) 531 { 532 struct net_bridge_port_group *p, *pg = src->pg; 533 struct net_bridge_port_group __rcu **pp; 534 struct net_bridge_mdb_entry *mp; 535 struct br_ip sg_ip; 536 537 memset(&sg_ip, 0, sizeof(sg_ip)); 538 sg_ip = pg->key.addr; 539 sg_ip.src = src->addr.src; 540 541 mp = br_mdb_ip_get(src->br, &sg_ip); 542 if (!mp) 543 return; 544 545 for (pp = &mp->ports; 546 (p = mlock_dereference(*pp, src->br)) != NULL; 547 pp = &p->next) { 548 if (!br_port_group_equal(p, pg->key.port, pg->eth_addr)) 549 continue; 550 551 if (p->rt_protocol != RTPROT_KERNEL && 552 (p->flags & MDB_PG_FLAGS_PERMANENT)) 553 break; 554 555 if (fastleave) 556 p->flags |= MDB_PG_FLAGS_FAST_LEAVE; 557 br_multicast_del_pg(mp, p, pp); 558 break; 559 } 560 src->flags &= ~BR_SGRP_F_INSTALLED; 561 } 562 563 /* install S,G and based on src's timer enable or disable forwarding */ 564 static void br_multicast_fwd_src_handle(struct net_bridge_group_src *src) 565 { 566 struct net_bridge_port_group_sg_key sg_key; 567 struct net_bridge_port_group *sg; 568 u8 old_flags; 569 570 br_multicast_fwd_src_add(src); 571 572 memset(&sg_key, 0, sizeof(sg_key)); 573 sg_key.addr = src->pg->key.addr; 574 sg_key.addr.src = src->addr.src; 575 sg_key.port = src->pg->key.port; 576 577 sg = br_sg_port_find(src->br, &sg_key); 578 if (!sg || (sg->flags & MDB_PG_FLAGS_PERMANENT)) 579 return; 580 581 old_flags = sg->flags; 582 if (timer_pending(&src->timer)) 583 sg->flags &= ~MDB_PG_FLAGS_BLOCKED; 584 else 585 sg->flags |= MDB_PG_FLAGS_BLOCKED; 586 587 if (old_flags != sg->flags) { 588 struct net_bridge_mdb_entry *sg_mp; 589 590 sg_mp = br_mdb_ip_get(src->br, &sg_key.addr); 591 if (!sg_mp) 592 return; 593 br_mdb_notify(src->br->dev, sg_mp, sg, RTM_NEWMDB); 594 } 595 } 596 597 static void br_multicast_destroy_mdb_entry(struct net_bridge_mcast_gc *gc) 598 { 599 struct net_bridge_mdb_entry *mp; 600 601 mp = container_of(gc, struct net_bridge_mdb_entry, mcast_gc); 602 WARN_ON(!hlist_unhashed(&mp->mdb_node)); 603 WARN_ON(mp->ports); 604 605 del_timer_sync(&mp->timer); 606 kfree_rcu(mp, rcu); 607 } 608 609 static void br_multicast_del_mdb_entry(struct net_bridge_mdb_entry *mp) 610 { 611 struct net_bridge *br = mp->br; 612 613 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode, 614 br_mdb_rht_params); 615 hlist_del_init_rcu(&mp->mdb_node); 616 hlist_add_head(&mp->mcast_gc.gc_node, &br->mcast_gc_list); 617 queue_work(system_long_wq, &br->mcast_gc_work); 618 } 619 620 static void br_multicast_group_expired(struct timer_list *t) 621 { 622 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer); 623 struct net_bridge *br = mp->br; 624 625 spin_lock(&br->multicast_lock); 626 if (hlist_unhashed(&mp->mdb_node) || !netif_running(br->dev) || 627 timer_pending(&mp->timer)) 628 goto out; 629 630 br_multicast_host_leave(mp, true); 631 632 if (mp->ports) 633 goto out; 634 br_multicast_del_mdb_entry(mp); 635 out: 636 spin_unlock(&br->multicast_lock); 637 } 638 639 static void br_multicast_destroy_group_src(struct net_bridge_mcast_gc *gc) 640 { 641 struct net_bridge_group_src *src; 642 643 src = container_of(gc, struct net_bridge_group_src, mcast_gc); 644 WARN_ON(!hlist_unhashed(&src->node)); 645 646 del_timer_sync(&src->timer); 647 kfree_rcu(src, rcu); 648 } 649 650 void br_multicast_del_group_src(struct net_bridge_group_src *src, 651 bool fastleave) 652 { 653 struct net_bridge *br = src->pg->key.port->br; 654 655 br_multicast_fwd_src_remove(src, fastleave); 656 hlist_del_init_rcu(&src->node); 657 src->pg->src_ents--; 658 hlist_add_head(&src->mcast_gc.gc_node, &br->mcast_gc_list); 659 queue_work(system_long_wq, &br->mcast_gc_work); 660 } 661 662 static void br_multicast_destroy_port_group(struct net_bridge_mcast_gc *gc) 663 { 664 struct net_bridge_port_group *pg; 665 666 pg = container_of(gc, struct net_bridge_port_group, mcast_gc); 667 WARN_ON(!hlist_unhashed(&pg->mglist)); 668 WARN_ON(!hlist_empty(&pg->src_list)); 669 670 del_timer_sync(&pg->rexmit_timer); 671 del_timer_sync(&pg->timer); 672 kfree_rcu(pg, rcu); 673 } 674 675 void br_multicast_del_pg(struct net_bridge_mdb_entry *mp, 676 struct net_bridge_port_group *pg, 677 struct net_bridge_port_group __rcu **pp) 678 { 679 struct net_bridge *br = pg->key.port->br; 680 struct net_bridge_group_src *ent; 681 struct hlist_node *tmp; 682 683 rcu_assign_pointer(*pp, pg->next); 684 hlist_del_init(&pg->mglist); 685 br_multicast_eht_clean_sets(pg); 686 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) 687 br_multicast_del_group_src(ent, false); 688 br_mdb_notify(br->dev, mp, pg, RTM_DELMDB); 689 if (!br_multicast_is_star_g(&mp->addr)) { 690 rhashtable_remove_fast(&br->sg_port_tbl, &pg->rhnode, 691 br_sg_port_rht_params); 692 br_multicast_sg_del_exclude_ports(mp); 693 } else { 694 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE); 695 } 696 hlist_add_head(&pg->mcast_gc.gc_node, &br->mcast_gc_list); 697 queue_work(system_long_wq, &br->mcast_gc_work); 698 699 if (!mp->ports && !mp->host_joined && netif_running(br->dev)) 700 mod_timer(&mp->timer, jiffies); 701 } 702 703 static void br_multicast_find_del_pg(struct net_bridge *br, 704 struct net_bridge_port_group *pg) 705 { 706 struct net_bridge_port_group __rcu **pp; 707 struct net_bridge_mdb_entry *mp; 708 struct net_bridge_port_group *p; 709 710 mp = br_mdb_ip_get(br, &pg->key.addr); 711 if (WARN_ON(!mp)) 712 return; 713 714 for (pp = &mp->ports; 715 (p = mlock_dereference(*pp, br)) != NULL; 716 pp = &p->next) { 717 if (p != pg) 718 continue; 719 720 br_multicast_del_pg(mp, pg, pp); 721 return; 722 } 723 724 WARN_ON(1); 725 } 726 727 static void br_multicast_port_group_expired(struct timer_list *t) 728 { 729 struct net_bridge_port_group *pg = from_timer(pg, t, timer); 730 struct net_bridge_group_src *src_ent; 731 struct net_bridge *br = pg->key.port->br; 732 struct hlist_node *tmp; 733 bool changed; 734 735 spin_lock(&br->multicast_lock); 736 if (!netif_running(br->dev) || timer_pending(&pg->timer) || 737 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT) 738 goto out; 739 740 changed = !!(pg->filter_mode == MCAST_EXCLUDE); 741 pg->filter_mode = MCAST_INCLUDE; 742 hlist_for_each_entry_safe(src_ent, tmp, &pg->src_list, node) { 743 if (!timer_pending(&src_ent->timer)) { 744 br_multicast_del_group_src(src_ent, false); 745 changed = true; 746 } 747 } 748 749 if (hlist_empty(&pg->src_list)) { 750 br_multicast_find_del_pg(br, pg); 751 } else if (changed) { 752 struct net_bridge_mdb_entry *mp = br_mdb_ip_get(br, &pg->key.addr); 753 754 if (changed && br_multicast_is_star_g(&pg->key.addr)) 755 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE); 756 757 if (WARN_ON(!mp)) 758 goto out; 759 br_mdb_notify(br->dev, mp, pg, RTM_NEWMDB); 760 } 761 out: 762 spin_unlock(&br->multicast_lock); 763 } 764 765 static void br_multicast_gc(struct hlist_head *head) 766 { 767 struct net_bridge_mcast_gc *gcent; 768 struct hlist_node *tmp; 769 770 hlist_for_each_entry_safe(gcent, tmp, head, gc_node) { 771 hlist_del_init(&gcent->gc_node); 772 gcent->destroy(gcent); 773 } 774 } 775 776 static void __br_multicast_query_handle_vlan(struct net_bridge_mcast *brmctx, 777 struct net_bridge_mcast_port *pmctx, 778 struct sk_buff *skb) 779 { 780 struct net_bridge_vlan *vlan = NULL; 781 782 if (pmctx && br_multicast_port_ctx_is_vlan(pmctx)) 783 vlan = pmctx->vlan; 784 else if (br_multicast_ctx_is_vlan(brmctx)) 785 vlan = brmctx->vlan; 786 787 if (vlan && !(vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED)) { 788 u16 vlan_proto; 789 790 if (br_vlan_get_proto(brmctx->br->dev, &vlan_proto) != 0) 791 return; 792 __vlan_hwaccel_put_tag(skb, htons(vlan_proto), vlan->vid); 793 } 794 } 795 796 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge_mcast *brmctx, 797 struct net_bridge_mcast_port *pmctx, 798 struct net_bridge_port_group *pg, 799 __be32 ip_dst, __be32 group, 800 bool with_srcs, bool over_lmqt, 801 u8 sflag, u8 *igmp_type, 802 bool *need_rexmit) 803 { 804 struct net_bridge_port *p = pg ? pg->key.port : NULL; 805 struct net_bridge_group_src *ent; 806 size_t pkt_size, igmp_hdr_size; 807 unsigned long now = jiffies; 808 struct igmpv3_query *ihv3; 809 void *csum_start = NULL; 810 __sum16 *csum = NULL; 811 struct sk_buff *skb; 812 struct igmphdr *ih; 813 struct ethhdr *eth; 814 unsigned long lmqt; 815 struct iphdr *iph; 816 u16 lmqt_srcs = 0; 817 818 igmp_hdr_size = sizeof(*ih); 819 if (brmctx->multicast_igmp_version == 3) { 820 igmp_hdr_size = sizeof(*ihv3); 821 if (pg && with_srcs) { 822 lmqt = now + (brmctx->multicast_last_member_interval * 823 brmctx->multicast_last_member_count); 824 hlist_for_each_entry(ent, &pg->src_list, node) { 825 if (over_lmqt == time_after(ent->timer.expires, 826 lmqt) && 827 ent->src_query_rexmit_cnt > 0) 828 lmqt_srcs++; 829 } 830 831 if (!lmqt_srcs) 832 return NULL; 833 igmp_hdr_size += lmqt_srcs * sizeof(__be32); 834 } 835 } 836 837 pkt_size = sizeof(*eth) + sizeof(*iph) + 4 + igmp_hdr_size; 838 if ((p && pkt_size > p->dev->mtu) || 839 pkt_size > brmctx->br->dev->mtu) 840 return NULL; 841 842 skb = netdev_alloc_skb_ip_align(brmctx->br->dev, pkt_size); 843 if (!skb) 844 goto out; 845 846 __br_multicast_query_handle_vlan(brmctx, pmctx, skb); 847 skb->protocol = htons(ETH_P_IP); 848 849 skb_reset_mac_header(skb); 850 eth = eth_hdr(skb); 851 852 ether_addr_copy(eth->h_source, brmctx->br->dev->dev_addr); 853 ip_eth_mc_map(ip_dst, eth->h_dest); 854 eth->h_proto = htons(ETH_P_IP); 855 skb_put(skb, sizeof(*eth)); 856 857 skb_set_network_header(skb, skb->len); 858 iph = ip_hdr(skb); 859 iph->tot_len = htons(pkt_size - sizeof(*eth)); 860 861 iph->version = 4; 862 iph->ihl = 6; 863 iph->tos = 0xc0; 864 iph->id = 0; 865 iph->frag_off = htons(IP_DF); 866 iph->ttl = 1; 867 iph->protocol = IPPROTO_IGMP; 868 iph->saddr = br_opt_get(brmctx->br, BROPT_MULTICAST_QUERY_USE_IFADDR) ? 869 inet_select_addr(brmctx->br->dev, 0, RT_SCOPE_LINK) : 0; 870 iph->daddr = ip_dst; 871 ((u8 *)&iph[1])[0] = IPOPT_RA; 872 ((u8 *)&iph[1])[1] = 4; 873 ((u8 *)&iph[1])[2] = 0; 874 ((u8 *)&iph[1])[3] = 0; 875 ip_send_check(iph); 876 skb_put(skb, 24); 877 878 skb_set_transport_header(skb, skb->len); 879 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY; 880 881 switch (brmctx->multicast_igmp_version) { 882 case 2: 883 ih = igmp_hdr(skb); 884 ih->type = IGMP_HOST_MEMBERSHIP_QUERY; 885 ih->code = (group ? brmctx->multicast_last_member_interval : 886 brmctx->multicast_query_response_interval) / 887 (HZ / IGMP_TIMER_SCALE); 888 ih->group = group; 889 ih->csum = 0; 890 csum = &ih->csum; 891 csum_start = (void *)ih; 892 break; 893 case 3: 894 ihv3 = igmpv3_query_hdr(skb); 895 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY; 896 ihv3->code = (group ? brmctx->multicast_last_member_interval : 897 brmctx->multicast_query_response_interval) / 898 (HZ / IGMP_TIMER_SCALE); 899 ihv3->group = group; 900 ihv3->qqic = brmctx->multicast_query_interval / HZ; 901 ihv3->nsrcs = htons(lmqt_srcs); 902 ihv3->resv = 0; 903 ihv3->suppress = sflag; 904 ihv3->qrv = 2; 905 ihv3->csum = 0; 906 csum = &ihv3->csum; 907 csum_start = (void *)ihv3; 908 if (!pg || !with_srcs) 909 break; 910 911 lmqt_srcs = 0; 912 hlist_for_each_entry(ent, &pg->src_list, node) { 913 if (over_lmqt == time_after(ent->timer.expires, 914 lmqt) && 915 ent->src_query_rexmit_cnt > 0) { 916 ihv3->srcs[lmqt_srcs++] = ent->addr.src.ip4; 917 ent->src_query_rexmit_cnt--; 918 if (need_rexmit && ent->src_query_rexmit_cnt) 919 *need_rexmit = true; 920 } 921 } 922 if (WARN_ON(lmqt_srcs != ntohs(ihv3->nsrcs))) { 923 kfree_skb(skb); 924 return NULL; 925 } 926 break; 927 } 928 929 if (WARN_ON(!csum || !csum_start)) { 930 kfree_skb(skb); 931 return NULL; 932 } 933 934 *csum = ip_compute_csum(csum_start, igmp_hdr_size); 935 skb_put(skb, igmp_hdr_size); 936 __skb_pull(skb, sizeof(*eth)); 937 938 out: 939 return skb; 940 } 941 942 #if IS_ENABLED(CONFIG_IPV6) 943 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge_mcast *brmctx, 944 struct net_bridge_mcast_port *pmctx, 945 struct net_bridge_port_group *pg, 946 const struct in6_addr *ip6_dst, 947 const struct in6_addr *group, 948 bool with_srcs, bool over_llqt, 949 u8 sflag, u8 *igmp_type, 950 bool *need_rexmit) 951 { 952 struct net_bridge_port *p = pg ? pg->key.port : NULL; 953 struct net_bridge_group_src *ent; 954 size_t pkt_size, mld_hdr_size; 955 unsigned long now = jiffies; 956 struct mld2_query *mld2q; 957 void *csum_start = NULL; 958 unsigned long interval; 959 __sum16 *csum = NULL; 960 struct ipv6hdr *ip6h; 961 struct mld_msg *mldq; 962 struct sk_buff *skb; 963 unsigned long llqt; 964 struct ethhdr *eth; 965 u16 llqt_srcs = 0; 966 u8 *hopopt; 967 968 mld_hdr_size = sizeof(*mldq); 969 if (brmctx->multicast_mld_version == 2) { 970 mld_hdr_size = sizeof(*mld2q); 971 if (pg && with_srcs) { 972 llqt = now + (brmctx->multicast_last_member_interval * 973 brmctx->multicast_last_member_count); 974 hlist_for_each_entry(ent, &pg->src_list, node) { 975 if (over_llqt == time_after(ent->timer.expires, 976 llqt) && 977 ent->src_query_rexmit_cnt > 0) 978 llqt_srcs++; 979 } 980 981 if (!llqt_srcs) 982 return NULL; 983 mld_hdr_size += llqt_srcs * sizeof(struct in6_addr); 984 } 985 } 986 987 pkt_size = sizeof(*eth) + sizeof(*ip6h) + 8 + mld_hdr_size; 988 if ((p && pkt_size > p->dev->mtu) || 989 pkt_size > brmctx->br->dev->mtu) 990 return NULL; 991 992 skb = netdev_alloc_skb_ip_align(brmctx->br->dev, pkt_size); 993 if (!skb) 994 goto out; 995 996 __br_multicast_query_handle_vlan(brmctx, pmctx, skb); 997 skb->protocol = htons(ETH_P_IPV6); 998 999 /* Ethernet header */ 1000 skb_reset_mac_header(skb); 1001 eth = eth_hdr(skb); 1002 1003 ether_addr_copy(eth->h_source, brmctx->br->dev->dev_addr); 1004 eth->h_proto = htons(ETH_P_IPV6); 1005 skb_put(skb, sizeof(*eth)); 1006 1007 /* IPv6 header + HbH option */ 1008 skb_set_network_header(skb, skb->len); 1009 ip6h = ipv6_hdr(skb); 1010 1011 *(__force __be32 *)ip6h = htonl(0x60000000); 1012 ip6h->payload_len = htons(8 + mld_hdr_size); 1013 ip6h->nexthdr = IPPROTO_HOPOPTS; 1014 ip6h->hop_limit = 1; 1015 ip6h->daddr = *ip6_dst; 1016 if (ipv6_dev_get_saddr(dev_net(brmctx->br->dev), brmctx->br->dev, 1017 &ip6h->daddr, 0, &ip6h->saddr)) { 1018 kfree_skb(skb); 1019 br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, false); 1020 return NULL; 1021 } 1022 1023 br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, true); 1024 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 1025 1026 hopopt = (u8 *)(ip6h + 1); 1027 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ 1028 hopopt[1] = 0; /* length of HbH */ 1029 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ 1030 hopopt[3] = 2; /* Length of RA Option */ 1031 hopopt[4] = 0; /* Type = 0x0000 (MLD) */ 1032 hopopt[5] = 0; 1033 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ 1034 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ 1035 1036 skb_put(skb, sizeof(*ip6h) + 8); 1037 1038 /* ICMPv6 */ 1039 skb_set_transport_header(skb, skb->len); 1040 interval = ipv6_addr_any(group) ? 1041 brmctx->multicast_query_response_interval : 1042 brmctx->multicast_last_member_interval; 1043 *igmp_type = ICMPV6_MGM_QUERY; 1044 switch (brmctx->multicast_mld_version) { 1045 case 1: 1046 mldq = (struct mld_msg *)icmp6_hdr(skb); 1047 mldq->mld_type = ICMPV6_MGM_QUERY; 1048 mldq->mld_code = 0; 1049 mldq->mld_cksum = 0; 1050 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); 1051 mldq->mld_reserved = 0; 1052 mldq->mld_mca = *group; 1053 csum = &mldq->mld_cksum; 1054 csum_start = (void *)mldq; 1055 break; 1056 case 2: 1057 mld2q = (struct mld2_query *)icmp6_hdr(skb); 1058 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval)); 1059 mld2q->mld2q_type = ICMPV6_MGM_QUERY; 1060 mld2q->mld2q_code = 0; 1061 mld2q->mld2q_cksum = 0; 1062 mld2q->mld2q_resv1 = 0; 1063 mld2q->mld2q_resv2 = 0; 1064 mld2q->mld2q_suppress = sflag; 1065 mld2q->mld2q_qrv = 2; 1066 mld2q->mld2q_nsrcs = htons(llqt_srcs); 1067 mld2q->mld2q_qqic = brmctx->multicast_query_interval / HZ; 1068 mld2q->mld2q_mca = *group; 1069 csum = &mld2q->mld2q_cksum; 1070 csum_start = (void *)mld2q; 1071 if (!pg || !with_srcs) 1072 break; 1073 1074 llqt_srcs = 0; 1075 hlist_for_each_entry(ent, &pg->src_list, node) { 1076 if (over_llqt == time_after(ent->timer.expires, 1077 llqt) && 1078 ent->src_query_rexmit_cnt > 0) { 1079 mld2q->mld2q_srcs[llqt_srcs++] = ent->addr.src.ip6; 1080 ent->src_query_rexmit_cnt--; 1081 if (need_rexmit && ent->src_query_rexmit_cnt) 1082 *need_rexmit = true; 1083 } 1084 } 1085 if (WARN_ON(llqt_srcs != ntohs(mld2q->mld2q_nsrcs))) { 1086 kfree_skb(skb); 1087 return NULL; 1088 } 1089 break; 1090 } 1091 1092 if (WARN_ON(!csum || !csum_start)) { 1093 kfree_skb(skb); 1094 return NULL; 1095 } 1096 1097 *csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, mld_hdr_size, 1098 IPPROTO_ICMPV6, 1099 csum_partial(csum_start, mld_hdr_size, 0)); 1100 skb_put(skb, mld_hdr_size); 1101 __skb_pull(skb, sizeof(*eth)); 1102 1103 out: 1104 return skb; 1105 } 1106 #endif 1107 1108 static struct sk_buff *br_multicast_alloc_query(struct net_bridge_mcast *brmctx, 1109 struct net_bridge_mcast_port *pmctx, 1110 struct net_bridge_port_group *pg, 1111 struct br_ip *ip_dst, 1112 struct br_ip *group, 1113 bool with_srcs, bool over_lmqt, 1114 u8 sflag, u8 *igmp_type, 1115 bool *need_rexmit) 1116 { 1117 __be32 ip4_dst; 1118 1119 switch (group->proto) { 1120 case htons(ETH_P_IP): 1121 ip4_dst = ip_dst ? ip_dst->dst.ip4 : htonl(INADDR_ALLHOSTS_GROUP); 1122 return br_ip4_multicast_alloc_query(brmctx, pmctx, pg, 1123 ip4_dst, group->dst.ip4, 1124 with_srcs, over_lmqt, 1125 sflag, igmp_type, 1126 need_rexmit); 1127 #if IS_ENABLED(CONFIG_IPV6) 1128 case htons(ETH_P_IPV6): { 1129 struct in6_addr ip6_dst; 1130 1131 if (ip_dst) 1132 ip6_dst = ip_dst->dst.ip6; 1133 else 1134 ipv6_addr_set(&ip6_dst, htonl(0xff020000), 0, 0, 1135 htonl(1)); 1136 1137 return br_ip6_multicast_alloc_query(brmctx, pmctx, pg, 1138 &ip6_dst, &group->dst.ip6, 1139 with_srcs, over_lmqt, 1140 sflag, igmp_type, 1141 need_rexmit); 1142 } 1143 #endif 1144 } 1145 return NULL; 1146 } 1147 1148 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, 1149 struct br_ip *group) 1150 { 1151 struct net_bridge_mdb_entry *mp; 1152 int err; 1153 1154 mp = br_mdb_ip_get(br, group); 1155 if (mp) 1156 return mp; 1157 1158 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) { 1159 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false); 1160 return ERR_PTR(-E2BIG); 1161 } 1162 1163 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 1164 if (unlikely(!mp)) 1165 return ERR_PTR(-ENOMEM); 1166 1167 mp->br = br; 1168 mp->addr = *group; 1169 mp->mcast_gc.destroy = br_multicast_destroy_mdb_entry; 1170 timer_setup(&mp->timer, br_multicast_group_expired, 0); 1171 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode, 1172 br_mdb_rht_params); 1173 if (err) { 1174 kfree(mp); 1175 mp = ERR_PTR(err); 1176 } else { 1177 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list); 1178 } 1179 1180 return mp; 1181 } 1182 1183 static void br_multicast_group_src_expired(struct timer_list *t) 1184 { 1185 struct net_bridge_group_src *src = from_timer(src, t, timer); 1186 struct net_bridge_port_group *pg; 1187 struct net_bridge *br = src->br; 1188 1189 spin_lock(&br->multicast_lock); 1190 if (hlist_unhashed(&src->node) || !netif_running(br->dev) || 1191 timer_pending(&src->timer)) 1192 goto out; 1193 1194 pg = src->pg; 1195 if (pg->filter_mode == MCAST_INCLUDE) { 1196 br_multicast_del_group_src(src, false); 1197 if (!hlist_empty(&pg->src_list)) 1198 goto out; 1199 br_multicast_find_del_pg(br, pg); 1200 } else { 1201 br_multicast_fwd_src_handle(src); 1202 } 1203 1204 out: 1205 spin_unlock(&br->multicast_lock); 1206 } 1207 1208 struct net_bridge_group_src * 1209 br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip) 1210 { 1211 struct net_bridge_group_src *ent; 1212 1213 switch (ip->proto) { 1214 case htons(ETH_P_IP): 1215 hlist_for_each_entry(ent, &pg->src_list, node) 1216 if (ip->src.ip4 == ent->addr.src.ip4) 1217 return ent; 1218 break; 1219 #if IS_ENABLED(CONFIG_IPV6) 1220 case htons(ETH_P_IPV6): 1221 hlist_for_each_entry(ent, &pg->src_list, node) 1222 if (!ipv6_addr_cmp(&ent->addr.src.ip6, &ip->src.ip6)) 1223 return ent; 1224 break; 1225 #endif 1226 } 1227 1228 return NULL; 1229 } 1230 1231 static struct net_bridge_group_src * 1232 br_multicast_new_group_src(struct net_bridge_port_group *pg, struct br_ip *src_ip) 1233 { 1234 struct net_bridge_group_src *grp_src; 1235 1236 if (unlikely(pg->src_ents >= PG_SRC_ENT_LIMIT)) 1237 return NULL; 1238 1239 switch (src_ip->proto) { 1240 case htons(ETH_P_IP): 1241 if (ipv4_is_zeronet(src_ip->src.ip4) || 1242 ipv4_is_multicast(src_ip->src.ip4)) 1243 return NULL; 1244 break; 1245 #if IS_ENABLED(CONFIG_IPV6) 1246 case htons(ETH_P_IPV6): 1247 if (ipv6_addr_any(&src_ip->src.ip6) || 1248 ipv6_addr_is_multicast(&src_ip->src.ip6)) 1249 return NULL; 1250 break; 1251 #endif 1252 } 1253 1254 grp_src = kzalloc(sizeof(*grp_src), GFP_ATOMIC); 1255 if (unlikely(!grp_src)) 1256 return NULL; 1257 1258 grp_src->pg = pg; 1259 grp_src->br = pg->key.port->br; 1260 grp_src->addr = *src_ip; 1261 grp_src->mcast_gc.destroy = br_multicast_destroy_group_src; 1262 timer_setup(&grp_src->timer, br_multicast_group_src_expired, 0); 1263 1264 hlist_add_head_rcu(&grp_src->node, &pg->src_list); 1265 pg->src_ents++; 1266 1267 return grp_src; 1268 } 1269 1270 struct net_bridge_port_group *br_multicast_new_port_group( 1271 struct net_bridge_port *port, 1272 struct br_ip *group, 1273 struct net_bridge_port_group __rcu *next, 1274 unsigned char flags, 1275 const unsigned char *src, 1276 u8 filter_mode, 1277 u8 rt_protocol) 1278 { 1279 struct net_bridge_port_group *p; 1280 1281 p = kzalloc(sizeof(*p), GFP_ATOMIC); 1282 if (unlikely(!p)) 1283 return NULL; 1284 1285 p->key.addr = *group; 1286 p->key.port = port; 1287 p->flags = flags; 1288 p->filter_mode = filter_mode; 1289 p->rt_protocol = rt_protocol; 1290 p->eht_host_tree = RB_ROOT; 1291 p->eht_set_tree = RB_ROOT; 1292 p->mcast_gc.destroy = br_multicast_destroy_port_group; 1293 INIT_HLIST_HEAD(&p->src_list); 1294 1295 if (!br_multicast_is_star_g(group) && 1296 rhashtable_lookup_insert_fast(&port->br->sg_port_tbl, &p->rhnode, 1297 br_sg_port_rht_params)) { 1298 kfree(p); 1299 return NULL; 1300 } 1301 1302 rcu_assign_pointer(p->next, next); 1303 timer_setup(&p->timer, br_multicast_port_group_expired, 0); 1304 timer_setup(&p->rexmit_timer, br_multicast_port_group_rexmit, 0); 1305 hlist_add_head(&p->mglist, &port->mglist); 1306 1307 if (src) 1308 memcpy(p->eth_addr, src, ETH_ALEN); 1309 else 1310 eth_broadcast_addr(p->eth_addr); 1311 1312 return p; 1313 } 1314 1315 void br_multicast_host_join(const struct net_bridge_mcast *brmctx, 1316 struct net_bridge_mdb_entry *mp, bool notify) 1317 { 1318 if (!mp->host_joined) { 1319 mp->host_joined = true; 1320 if (br_multicast_is_star_g(&mp->addr)) 1321 br_multicast_star_g_host_state(mp); 1322 if (notify) 1323 br_mdb_notify(mp->br->dev, mp, NULL, RTM_NEWMDB); 1324 } 1325 1326 if (br_group_is_l2(&mp->addr)) 1327 return; 1328 1329 mod_timer(&mp->timer, jiffies + brmctx->multicast_membership_interval); 1330 } 1331 1332 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify) 1333 { 1334 if (!mp->host_joined) 1335 return; 1336 1337 mp->host_joined = false; 1338 if (br_multicast_is_star_g(&mp->addr)) 1339 br_multicast_star_g_host_state(mp); 1340 if (notify) 1341 br_mdb_notify(mp->br->dev, mp, NULL, RTM_DELMDB); 1342 } 1343 1344 static struct net_bridge_port_group * 1345 __br_multicast_add_group(struct net_bridge_mcast *brmctx, 1346 struct net_bridge_mcast_port *pmctx, 1347 struct br_ip *group, 1348 const unsigned char *src, 1349 u8 filter_mode, 1350 bool igmpv2_mldv1, 1351 bool blocked) 1352 { 1353 struct net_bridge_port_group __rcu **pp; 1354 struct net_bridge_port_group *p = NULL; 1355 struct net_bridge_mdb_entry *mp; 1356 unsigned long now = jiffies; 1357 1358 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 1359 goto out; 1360 1361 mp = br_multicast_new_group(brmctx->br, group); 1362 if (IS_ERR(mp)) 1363 return ERR_CAST(mp); 1364 1365 if (!pmctx) { 1366 br_multicast_host_join(brmctx, mp, true); 1367 goto out; 1368 } 1369 1370 for (pp = &mp->ports; 1371 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 1372 pp = &p->next) { 1373 if (br_port_group_equal(p, pmctx->port, src)) 1374 goto found; 1375 if ((unsigned long)p->key.port < (unsigned long)pmctx->port) 1376 break; 1377 } 1378 1379 p = br_multicast_new_port_group(pmctx->port, group, *pp, 0, src, 1380 filter_mode, RTPROT_KERNEL); 1381 if (unlikely(!p)) { 1382 p = ERR_PTR(-ENOMEM); 1383 goto out; 1384 } 1385 rcu_assign_pointer(*pp, p); 1386 if (blocked) 1387 p->flags |= MDB_PG_FLAGS_BLOCKED; 1388 br_mdb_notify(brmctx->br->dev, mp, p, RTM_NEWMDB); 1389 1390 found: 1391 if (igmpv2_mldv1) 1392 mod_timer(&p->timer, 1393 now + brmctx->multicast_membership_interval); 1394 1395 out: 1396 return p; 1397 } 1398 1399 static int br_multicast_add_group(struct net_bridge_mcast *brmctx, 1400 struct net_bridge_mcast_port *pmctx, 1401 struct br_ip *group, 1402 const unsigned char *src, 1403 u8 filter_mode, 1404 bool igmpv2_mldv1) 1405 { 1406 struct net_bridge_port_group *pg; 1407 int err; 1408 1409 spin_lock(&brmctx->br->multicast_lock); 1410 pg = __br_multicast_add_group(brmctx, pmctx, group, src, filter_mode, 1411 igmpv2_mldv1, false); 1412 /* NULL is considered valid for host joined groups */ 1413 err = PTR_ERR_OR_ZERO(pg); 1414 spin_unlock(&brmctx->br->multicast_lock); 1415 1416 return err; 1417 } 1418 1419 static int br_ip4_multicast_add_group(struct net_bridge_mcast *brmctx, 1420 struct net_bridge_mcast_port *pmctx, 1421 __be32 group, 1422 __u16 vid, 1423 const unsigned char *src, 1424 bool igmpv2) 1425 { 1426 struct br_ip br_group; 1427 u8 filter_mode; 1428 1429 if (ipv4_is_local_multicast(group)) 1430 return 0; 1431 1432 memset(&br_group, 0, sizeof(br_group)); 1433 br_group.dst.ip4 = group; 1434 br_group.proto = htons(ETH_P_IP); 1435 br_group.vid = vid; 1436 filter_mode = igmpv2 ? MCAST_EXCLUDE : MCAST_INCLUDE; 1437 1438 return br_multicast_add_group(brmctx, pmctx, &br_group, src, 1439 filter_mode, igmpv2); 1440 } 1441 1442 #if IS_ENABLED(CONFIG_IPV6) 1443 static int br_ip6_multicast_add_group(struct net_bridge_mcast *brmctx, 1444 struct net_bridge_mcast_port *pmctx, 1445 const struct in6_addr *group, 1446 __u16 vid, 1447 const unsigned char *src, 1448 bool mldv1) 1449 { 1450 struct br_ip br_group; 1451 u8 filter_mode; 1452 1453 if (ipv6_addr_is_ll_all_nodes(group)) 1454 return 0; 1455 1456 memset(&br_group, 0, sizeof(br_group)); 1457 br_group.dst.ip6 = *group; 1458 br_group.proto = htons(ETH_P_IPV6); 1459 br_group.vid = vid; 1460 filter_mode = mldv1 ? MCAST_EXCLUDE : MCAST_INCLUDE; 1461 1462 return br_multicast_add_group(brmctx, pmctx, &br_group, src, 1463 filter_mode, mldv1); 1464 } 1465 #endif 1466 1467 static bool br_multicast_rport_del(struct hlist_node *rlist) 1468 { 1469 if (hlist_unhashed(rlist)) 1470 return false; 1471 1472 hlist_del_init_rcu(rlist); 1473 return true; 1474 } 1475 1476 static bool br_ip4_multicast_rport_del(struct net_bridge_mcast_port *pmctx) 1477 { 1478 return br_multicast_rport_del(&pmctx->ip4_rlist); 1479 } 1480 1481 static bool br_ip6_multicast_rport_del(struct net_bridge_mcast_port *pmctx) 1482 { 1483 #if IS_ENABLED(CONFIG_IPV6) 1484 return br_multicast_rport_del(&pmctx->ip6_rlist); 1485 #else 1486 return false; 1487 #endif 1488 } 1489 1490 static void br_multicast_router_expired(struct net_bridge_mcast_port *pmctx, 1491 struct timer_list *t, 1492 struct hlist_node *rlist) 1493 { 1494 struct net_bridge *br = pmctx->port->br; 1495 bool del; 1496 1497 spin_lock(&br->multicast_lock); 1498 if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED || 1499 pmctx->multicast_router == MDB_RTR_TYPE_PERM || 1500 timer_pending(t)) 1501 goto out; 1502 1503 del = br_multicast_rport_del(rlist); 1504 br_multicast_rport_del_notify(pmctx, del); 1505 out: 1506 spin_unlock(&br->multicast_lock); 1507 } 1508 1509 static void br_ip4_multicast_router_expired(struct timer_list *t) 1510 { 1511 struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t, 1512 ip4_mc_router_timer); 1513 1514 br_multicast_router_expired(pmctx, t, &pmctx->ip4_rlist); 1515 } 1516 1517 #if IS_ENABLED(CONFIG_IPV6) 1518 static void br_ip6_multicast_router_expired(struct timer_list *t) 1519 { 1520 struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t, 1521 ip6_mc_router_timer); 1522 1523 br_multicast_router_expired(pmctx, t, &pmctx->ip6_rlist); 1524 } 1525 #endif 1526 1527 static void br_mc_router_state_change(struct net_bridge *p, 1528 bool is_mc_router) 1529 { 1530 struct switchdev_attr attr = { 1531 .orig_dev = p->dev, 1532 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER, 1533 .flags = SWITCHDEV_F_DEFER, 1534 .u.mrouter = is_mc_router, 1535 }; 1536 1537 switchdev_port_attr_set(p->dev, &attr, NULL); 1538 } 1539 1540 static void br_multicast_local_router_expired(struct net_bridge_mcast *brmctx, 1541 struct timer_list *timer) 1542 { 1543 spin_lock(&brmctx->br->multicast_lock); 1544 if (brmctx->multicast_router == MDB_RTR_TYPE_DISABLED || 1545 brmctx->multicast_router == MDB_RTR_TYPE_PERM || 1546 br_ip4_multicast_is_router(brmctx) || 1547 br_ip6_multicast_is_router(brmctx)) 1548 goto out; 1549 1550 br_mc_router_state_change(brmctx->br, false); 1551 out: 1552 spin_unlock(&brmctx->br->multicast_lock); 1553 } 1554 1555 static void br_ip4_multicast_local_router_expired(struct timer_list *t) 1556 { 1557 struct net_bridge_mcast *brmctx = from_timer(brmctx, t, 1558 ip4_mc_router_timer); 1559 1560 br_multicast_local_router_expired(brmctx, t); 1561 } 1562 1563 #if IS_ENABLED(CONFIG_IPV6) 1564 static void br_ip6_multicast_local_router_expired(struct timer_list *t) 1565 { 1566 struct net_bridge_mcast *brmctx = from_timer(brmctx, t, 1567 ip6_mc_router_timer); 1568 1569 br_multicast_local_router_expired(brmctx, t); 1570 } 1571 #endif 1572 1573 static void br_multicast_querier_expired(struct net_bridge_mcast *brmctx, 1574 struct bridge_mcast_own_query *query) 1575 { 1576 spin_lock(&brmctx->br->multicast_lock); 1577 if (!netif_running(brmctx->br->dev) || 1578 br_multicast_ctx_vlan_global_disabled(brmctx) || 1579 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) 1580 goto out; 1581 1582 br_multicast_start_querier(brmctx, query); 1583 1584 out: 1585 spin_unlock(&brmctx->br->multicast_lock); 1586 } 1587 1588 static void br_ip4_multicast_querier_expired(struct timer_list *t) 1589 { 1590 struct net_bridge_mcast *brmctx = from_timer(brmctx, t, 1591 ip4_other_query.timer); 1592 1593 br_multicast_querier_expired(brmctx, &brmctx->ip4_own_query); 1594 } 1595 1596 #if IS_ENABLED(CONFIG_IPV6) 1597 static void br_ip6_multicast_querier_expired(struct timer_list *t) 1598 { 1599 struct net_bridge_mcast *brmctx = from_timer(brmctx, t, 1600 ip6_other_query.timer); 1601 1602 br_multicast_querier_expired(brmctx, &brmctx->ip6_own_query); 1603 } 1604 #endif 1605 1606 static void br_multicast_select_own_querier(struct net_bridge_mcast *brmctx, 1607 struct br_ip *ip, 1608 struct sk_buff *skb) 1609 { 1610 if (ip->proto == htons(ETH_P_IP)) 1611 brmctx->ip4_querier.addr.src.ip4 = ip_hdr(skb)->saddr; 1612 #if IS_ENABLED(CONFIG_IPV6) 1613 else 1614 brmctx->ip6_querier.addr.src.ip6 = ipv6_hdr(skb)->saddr; 1615 #endif 1616 } 1617 1618 static void __br_multicast_send_query(struct net_bridge_mcast *brmctx, 1619 struct net_bridge_mcast_port *pmctx, 1620 struct net_bridge_port_group *pg, 1621 struct br_ip *ip_dst, 1622 struct br_ip *group, 1623 bool with_srcs, 1624 u8 sflag, 1625 bool *need_rexmit) 1626 { 1627 bool over_lmqt = !!sflag; 1628 struct sk_buff *skb; 1629 u8 igmp_type; 1630 1631 if (!br_multicast_ctx_should_use(brmctx, pmctx) || 1632 !br_multicast_ctx_matches_vlan_snooping(brmctx)) 1633 return; 1634 1635 again_under_lmqt: 1636 skb = br_multicast_alloc_query(brmctx, pmctx, pg, ip_dst, group, 1637 with_srcs, over_lmqt, sflag, &igmp_type, 1638 need_rexmit); 1639 if (!skb) 1640 return; 1641 1642 if (pmctx) { 1643 skb->dev = pmctx->port->dev; 1644 br_multicast_count(brmctx->br, pmctx->port, skb, igmp_type, 1645 BR_MCAST_DIR_TX); 1646 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, 1647 dev_net(pmctx->port->dev), NULL, skb, NULL, skb->dev, 1648 br_dev_queue_push_xmit); 1649 1650 if (over_lmqt && with_srcs && sflag) { 1651 over_lmqt = false; 1652 goto again_under_lmqt; 1653 } 1654 } else { 1655 br_multicast_select_own_querier(brmctx, group, skb); 1656 br_multicast_count(brmctx->br, NULL, skb, igmp_type, 1657 BR_MCAST_DIR_RX); 1658 netif_rx(skb); 1659 } 1660 } 1661 1662 static void br_multicast_read_querier(const struct bridge_mcast_querier *querier, 1663 struct bridge_mcast_querier *dest) 1664 { 1665 unsigned int seq; 1666 1667 memset(dest, 0, sizeof(*dest)); 1668 do { 1669 seq = read_seqcount_begin(&querier->seq); 1670 dest->port_ifidx = querier->port_ifidx; 1671 memcpy(&dest->addr, &querier->addr, sizeof(struct br_ip)); 1672 } while (read_seqcount_retry(&querier->seq, seq)); 1673 } 1674 1675 static void br_multicast_update_querier(struct net_bridge_mcast *brmctx, 1676 struct bridge_mcast_querier *querier, 1677 int ifindex, 1678 struct br_ip *saddr) 1679 { 1680 write_seqcount_begin(&querier->seq); 1681 querier->port_ifidx = ifindex; 1682 memcpy(&querier->addr, saddr, sizeof(*saddr)); 1683 write_seqcount_end(&querier->seq); 1684 } 1685 1686 static void br_multicast_send_query(struct net_bridge_mcast *brmctx, 1687 struct net_bridge_mcast_port *pmctx, 1688 struct bridge_mcast_own_query *own_query) 1689 { 1690 struct bridge_mcast_other_query *other_query = NULL; 1691 struct bridge_mcast_querier *querier; 1692 struct br_ip br_group; 1693 unsigned long time; 1694 1695 if (!br_multicast_ctx_should_use(brmctx, pmctx) || 1696 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) || 1697 !brmctx->multicast_querier) 1698 return; 1699 1700 memset(&br_group.dst, 0, sizeof(br_group.dst)); 1701 1702 if (pmctx ? (own_query == &pmctx->ip4_own_query) : 1703 (own_query == &brmctx->ip4_own_query)) { 1704 querier = &brmctx->ip4_querier; 1705 other_query = &brmctx->ip4_other_query; 1706 br_group.proto = htons(ETH_P_IP); 1707 #if IS_ENABLED(CONFIG_IPV6) 1708 } else { 1709 querier = &brmctx->ip6_querier; 1710 other_query = &brmctx->ip6_other_query; 1711 br_group.proto = htons(ETH_P_IPV6); 1712 #endif 1713 } 1714 1715 if (!other_query || timer_pending(&other_query->timer)) 1716 return; 1717 1718 /* we're about to select ourselves as querier */ 1719 if (!pmctx && querier->port_ifidx) { 1720 struct br_ip zeroip = {}; 1721 1722 br_multicast_update_querier(brmctx, querier, 0, &zeroip); 1723 } 1724 1725 __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &br_group, false, 1726 0, NULL); 1727 1728 time = jiffies; 1729 time += own_query->startup_sent < brmctx->multicast_startup_query_count ? 1730 brmctx->multicast_startup_query_interval : 1731 brmctx->multicast_query_interval; 1732 mod_timer(&own_query->timer, time); 1733 } 1734 1735 static void 1736 br_multicast_port_query_expired(struct net_bridge_mcast_port *pmctx, 1737 struct bridge_mcast_own_query *query) 1738 { 1739 struct net_bridge *br = pmctx->port->br; 1740 struct net_bridge_mcast *brmctx; 1741 1742 spin_lock(&br->multicast_lock); 1743 if (br_multicast_port_ctx_state_stopped(pmctx)) 1744 goto out; 1745 1746 brmctx = br_multicast_port_ctx_get_global(pmctx); 1747 if (query->startup_sent < brmctx->multicast_startup_query_count) 1748 query->startup_sent++; 1749 1750 br_multicast_send_query(brmctx, pmctx, query); 1751 1752 out: 1753 spin_unlock(&br->multicast_lock); 1754 } 1755 1756 static void br_ip4_multicast_port_query_expired(struct timer_list *t) 1757 { 1758 struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t, 1759 ip4_own_query.timer); 1760 1761 br_multicast_port_query_expired(pmctx, &pmctx->ip4_own_query); 1762 } 1763 1764 #if IS_ENABLED(CONFIG_IPV6) 1765 static void br_ip6_multicast_port_query_expired(struct timer_list *t) 1766 { 1767 struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t, 1768 ip6_own_query.timer); 1769 1770 br_multicast_port_query_expired(pmctx, &pmctx->ip6_own_query); 1771 } 1772 #endif 1773 1774 static void br_multicast_port_group_rexmit(struct timer_list *t) 1775 { 1776 struct net_bridge_port_group *pg = from_timer(pg, t, rexmit_timer); 1777 struct bridge_mcast_other_query *other_query = NULL; 1778 struct net_bridge *br = pg->key.port->br; 1779 struct net_bridge_mcast_port *pmctx; 1780 struct net_bridge_mcast *brmctx; 1781 bool need_rexmit = false; 1782 1783 spin_lock(&br->multicast_lock); 1784 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) || 1785 !br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1786 goto out; 1787 1788 pmctx = br_multicast_pg_to_port_ctx(pg); 1789 if (!pmctx) 1790 goto out; 1791 brmctx = br_multicast_port_ctx_get_global(pmctx); 1792 if (!brmctx->multicast_querier) 1793 goto out; 1794 1795 if (pg->key.addr.proto == htons(ETH_P_IP)) 1796 other_query = &brmctx->ip4_other_query; 1797 #if IS_ENABLED(CONFIG_IPV6) 1798 else 1799 other_query = &brmctx->ip6_other_query; 1800 #endif 1801 1802 if (!other_query || timer_pending(&other_query->timer)) 1803 goto out; 1804 1805 if (pg->grp_query_rexmit_cnt) { 1806 pg->grp_query_rexmit_cnt--; 1807 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 1808 &pg->key.addr, false, 1, NULL); 1809 } 1810 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 1811 &pg->key.addr, true, 0, &need_rexmit); 1812 1813 if (pg->grp_query_rexmit_cnt || need_rexmit) 1814 mod_timer(&pg->rexmit_timer, jiffies + 1815 brmctx->multicast_last_member_interval); 1816 out: 1817 spin_unlock(&br->multicast_lock); 1818 } 1819 1820 static int br_mc_disabled_update(struct net_device *dev, bool value, 1821 struct netlink_ext_ack *extack) 1822 { 1823 struct switchdev_attr attr = { 1824 .orig_dev = dev, 1825 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED, 1826 .flags = SWITCHDEV_F_DEFER, 1827 .u.mc_disabled = !value, 1828 }; 1829 1830 return switchdev_port_attr_set(dev, &attr, extack); 1831 } 1832 1833 void br_multicast_port_ctx_init(struct net_bridge_port *port, 1834 struct net_bridge_vlan *vlan, 1835 struct net_bridge_mcast_port *pmctx) 1836 { 1837 pmctx->port = port; 1838 pmctx->vlan = vlan; 1839 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1840 timer_setup(&pmctx->ip4_mc_router_timer, 1841 br_ip4_multicast_router_expired, 0); 1842 timer_setup(&pmctx->ip4_own_query.timer, 1843 br_ip4_multicast_port_query_expired, 0); 1844 #if IS_ENABLED(CONFIG_IPV6) 1845 timer_setup(&pmctx->ip6_mc_router_timer, 1846 br_ip6_multicast_router_expired, 0); 1847 timer_setup(&pmctx->ip6_own_query.timer, 1848 br_ip6_multicast_port_query_expired, 0); 1849 #endif 1850 } 1851 1852 void br_multicast_port_ctx_deinit(struct net_bridge_mcast_port *pmctx) 1853 { 1854 #if IS_ENABLED(CONFIG_IPV6) 1855 del_timer_sync(&pmctx->ip6_mc_router_timer); 1856 #endif 1857 del_timer_sync(&pmctx->ip4_mc_router_timer); 1858 } 1859 1860 int br_multicast_add_port(struct net_bridge_port *port) 1861 { 1862 int err; 1863 1864 port->multicast_eht_hosts_limit = BR_MCAST_DEFAULT_EHT_HOSTS_LIMIT; 1865 br_multicast_port_ctx_init(port, NULL, &port->multicast_ctx); 1866 1867 err = br_mc_disabled_update(port->dev, 1868 br_opt_get(port->br, 1869 BROPT_MULTICAST_ENABLED), 1870 NULL); 1871 if (err && err != -EOPNOTSUPP) 1872 return err; 1873 1874 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 1875 if (!port->mcast_stats) 1876 return -ENOMEM; 1877 1878 return 0; 1879 } 1880 1881 void br_multicast_del_port(struct net_bridge_port *port) 1882 { 1883 struct net_bridge *br = port->br; 1884 struct net_bridge_port_group *pg; 1885 HLIST_HEAD(deleted_head); 1886 struct hlist_node *n; 1887 1888 /* Take care of the remaining groups, only perm ones should be left */ 1889 spin_lock_bh(&br->multicast_lock); 1890 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 1891 br_multicast_find_del_pg(br, pg); 1892 hlist_move_list(&br->mcast_gc_list, &deleted_head); 1893 spin_unlock_bh(&br->multicast_lock); 1894 br_multicast_gc(&deleted_head); 1895 br_multicast_port_ctx_deinit(&port->multicast_ctx); 1896 free_percpu(port->mcast_stats); 1897 } 1898 1899 static void br_multicast_enable(struct bridge_mcast_own_query *query) 1900 { 1901 query->startup_sent = 0; 1902 1903 if (try_to_del_timer_sync(&query->timer) >= 0 || 1904 del_timer(&query->timer)) 1905 mod_timer(&query->timer, jiffies); 1906 } 1907 1908 static void __br_multicast_enable_port_ctx(struct net_bridge_mcast_port *pmctx) 1909 { 1910 struct net_bridge *br = pmctx->port->br; 1911 struct net_bridge_mcast *brmctx; 1912 1913 brmctx = br_multicast_port_ctx_get_global(pmctx); 1914 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || 1915 !netif_running(br->dev)) 1916 return; 1917 1918 br_multicast_enable(&pmctx->ip4_own_query); 1919 #if IS_ENABLED(CONFIG_IPV6) 1920 br_multicast_enable(&pmctx->ip6_own_query); 1921 #endif 1922 if (pmctx->multicast_router == MDB_RTR_TYPE_PERM) { 1923 br_ip4_multicast_add_router(brmctx, pmctx); 1924 br_ip6_multicast_add_router(brmctx, pmctx); 1925 } 1926 } 1927 1928 void br_multicast_enable_port(struct net_bridge_port *port) 1929 { 1930 struct net_bridge *br = port->br; 1931 1932 spin_lock_bh(&br->multicast_lock); 1933 __br_multicast_enable_port_ctx(&port->multicast_ctx); 1934 spin_unlock_bh(&br->multicast_lock); 1935 } 1936 1937 static void __br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx) 1938 { 1939 struct net_bridge_port_group *pg; 1940 struct hlist_node *n; 1941 bool del = false; 1942 1943 hlist_for_each_entry_safe(pg, n, &pmctx->port->mglist, mglist) 1944 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT) && 1945 (!br_multicast_port_ctx_is_vlan(pmctx) || 1946 pg->key.addr.vid == pmctx->vlan->vid)) 1947 br_multicast_find_del_pg(pmctx->port->br, pg); 1948 1949 del |= br_ip4_multicast_rport_del(pmctx); 1950 del_timer(&pmctx->ip4_mc_router_timer); 1951 del_timer(&pmctx->ip4_own_query.timer); 1952 del |= br_ip6_multicast_rport_del(pmctx); 1953 #if IS_ENABLED(CONFIG_IPV6) 1954 del_timer(&pmctx->ip6_mc_router_timer); 1955 del_timer(&pmctx->ip6_own_query.timer); 1956 #endif 1957 br_multicast_rport_del_notify(pmctx, del); 1958 } 1959 1960 void br_multicast_disable_port(struct net_bridge_port *port) 1961 { 1962 spin_lock_bh(&port->br->multicast_lock); 1963 __br_multicast_disable_port_ctx(&port->multicast_ctx); 1964 spin_unlock_bh(&port->br->multicast_lock); 1965 } 1966 1967 static int __grp_src_delete_marked(struct net_bridge_port_group *pg) 1968 { 1969 struct net_bridge_group_src *ent; 1970 struct hlist_node *tmp; 1971 int deleted = 0; 1972 1973 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) 1974 if (ent->flags & BR_SGRP_F_DELETE) { 1975 br_multicast_del_group_src(ent, false); 1976 deleted++; 1977 } 1978 1979 return deleted; 1980 } 1981 1982 static void __grp_src_mod_timer(struct net_bridge_group_src *src, 1983 unsigned long expires) 1984 { 1985 mod_timer(&src->timer, expires); 1986 br_multicast_fwd_src_handle(src); 1987 } 1988 1989 static void __grp_src_query_marked_and_rexmit(struct net_bridge_mcast *brmctx, 1990 struct net_bridge_mcast_port *pmctx, 1991 struct net_bridge_port_group *pg) 1992 { 1993 struct bridge_mcast_other_query *other_query = NULL; 1994 u32 lmqc = brmctx->multicast_last_member_count; 1995 unsigned long lmqt, lmi, now = jiffies; 1996 struct net_bridge_group_src *ent; 1997 1998 if (!netif_running(brmctx->br->dev) || 1999 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) 2000 return; 2001 2002 if (pg->key.addr.proto == htons(ETH_P_IP)) 2003 other_query = &brmctx->ip4_other_query; 2004 #if IS_ENABLED(CONFIG_IPV6) 2005 else 2006 other_query = &brmctx->ip6_other_query; 2007 #endif 2008 2009 lmqt = now + br_multicast_lmqt(brmctx); 2010 hlist_for_each_entry(ent, &pg->src_list, node) { 2011 if (ent->flags & BR_SGRP_F_SEND) { 2012 ent->flags &= ~BR_SGRP_F_SEND; 2013 if (ent->timer.expires > lmqt) { 2014 if (brmctx->multicast_querier && 2015 other_query && 2016 !timer_pending(&other_query->timer)) 2017 ent->src_query_rexmit_cnt = lmqc; 2018 __grp_src_mod_timer(ent, lmqt); 2019 } 2020 } 2021 } 2022 2023 if (!brmctx->multicast_querier || 2024 !other_query || timer_pending(&other_query->timer)) 2025 return; 2026 2027 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 2028 &pg->key.addr, true, 1, NULL); 2029 2030 lmi = now + brmctx->multicast_last_member_interval; 2031 if (!timer_pending(&pg->rexmit_timer) || 2032 time_after(pg->rexmit_timer.expires, lmi)) 2033 mod_timer(&pg->rexmit_timer, lmi); 2034 } 2035 2036 static void __grp_send_query_and_rexmit(struct net_bridge_mcast *brmctx, 2037 struct net_bridge_mcast_port *pmctx, 2038 struct net_bridge_port_group *pg) 2039 { 2040 struct bridge_mcast_other_query *other_query = NULL; 2041 unsigned long now = jiffies, lmi; 2042 2043 if (!netif_running(brmctx->br->dev) || 2044 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) 2045 return; 2046 2047 if (pg->key.addr.proto == htons(ETH_P_IP)) 2048 other_query = &brmctx->ip4_other_query; 2049 #if IS_ENABLED(CONFIG_IPV6) 2050 else 2051 other_query = &brmctx->ip6_other_query; 2052 #endif 2053 2054 if (brmctx->multicast_querier && 2055 other_query && !timer_pending(&other_query->timer)) { 2056 lmi = now + brmctx->multicast_last_member_interval; 2057 pg->grp_query_rexmit_cnt = brmctx->multicast_last_member_count - 1; 2058 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 2059 &pg->key.addr, false, 0, NULL); 2060 if (!timer_pending(&pg->rexmit_timer) || 2061 time_after(pg->rexmit_timer.expires, lmi)) 2062 mod_timer(&pg->rexmit_timer, lmi); 2063 } 2064 2065 if (pg->filter_mode == MCAST_EXCLUDE && 2066 (!timer_pending(&pg->timer) || 2067 time_after(pg->timer.expires, now + br_multicast_lmqt(brmctx)))) 2068 mod_timer(&pg->timer, now + br_multicast_lmqt(brmctx)); 2069 } 2070 2071 /* State Msg type New state Actions 2072 * INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI 2073 * INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI 2074 * EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI 2075 */ 2076 static bool br_multicast_isinc_allow(const struct net_bridge_mcast *brmctx, 2077 struct net_bridge_port_group *pg, void *h_addr, 2078 void *srcs, u32 nsrcs, size_t addr_size, 2079 int grec_type) 2080 { 2081 struct net_bridge_group_src *ent; 2082 unsigned long now = jiffies; 2083 bool changed = false; 2084 struct br_ip src_ip; 2085 u32 src_idx; 2086 2087 memset(&src_ip, 0, sizeof(src_ip)); 2088 src_ip.proto = pg->key.addr.proto; 2089 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2090 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2091 ent = br_multicast_find_group_src(pg, &src_ip); 2092 if (!ent) { 2093 ent = br_multicast_new_group_src(pg, &src_ip); 2094 if (ent) 2095 changed = true; 2096 } 2097 2098 if (ent) 2099 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx)); 2100 } 2101 2102 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2103 grec_type)) 2104 changed = true; 2105 2106 return changed; 2107 } 2108 2109 /* State Msg type New state Actions 2110 * INCLUDE (A) IS_EX (B) EXCLUDE (A*B,B-A) (B-A)=0 2111 * Delete (A-B) 2112 * Group Timer=GMI 2113 */ 2114 static void __grp_src_isexc_incl(const struct net_bridge_mcast *brmctx, 2115 struct net_bridge_port_group *pg, void *h_addr, 2116 void *srcs, u32 nsrcs, size_t addr_size, 2117 int grec_type) 2118 { 2119 struct net_bridge_group_src *ent; 2120 struct br_ip src_ip; 2121 u32 src_idx; 2122 2123 hlist_for_each_entry(ent, &pg->src_list, node) 2124 ent->flags |= BR_SGRP_F_DELETE; 2125 2126 memset(&src_ip, 0, sizeof(src_ip)); 2127 src_ip.proto = pg->key.addr.proto; 2128 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2129 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2130 ent = br_multicast_find_group_src(pg, &src_ip); 2131 if (ent) 2132 ent->flags &= ~BR_SGRP_F_DELETE; 2133 else 2134 ent = br_multicast_new_group_src(pg, &src_ip); 2135 if (ent) 2136 br_multicast_fwd_src_handle(ent); 2137 } 2138 2139 br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2140 grec_type); 2141 2142 __grp_src_delete_marked(pg); 2143 } 2144 2145 /* State Msg type New state Actions 2146 * EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=GMI 2147 * Delete (X-A) 2148 * Delete (Y-A) 2149 * Group Timer=GMI 2150 */ 2151 static bool __grp_src_isexc_excl(const struct net_bridge_mcast *brmctx, 2152 struct net_bridge_port_group *pg, void *h_addr, 2153 void *srcs, u32 nsrcs, size_t addr_size, 2154 int grec_type) 2155 { 2156 struct net_bridge_group_src *ent; 2157 unsigned long now = jiffies; 2158 bool changed = false; 2159 struct br_ip src_ip; 2160 u32 src_idx; 2161 2162 hlist_for_each_entry(ent, &pg->src_list, node) 2163 ent->flags |= BR_SGRP_F_DELETE; 2164 2165 memset(&src_ip, 0, sizeof(src_ip)); 2166 src_ip.proto = pg->key.addr.proto; 2167 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2168 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2169 ent = br_multicast_find_group_src(pg, &src_ip); 2170 if (ent) { 2171 ent->flags &= ~BR_SGRP_F_DELETE; 2172 } else { 2173 ent = br_multicast_new_group_src(pg, &src_ip); 2174 if (ent) { 2175 __grp_src_mod_timer(ent, 2176 now + br_multicast_gmi(brmctx)); 2177 changed = true; 2178 } 2179 } 2180 } 2181 2182 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2183 grec_type)) 2184 changed = true; 2185 2186 if (__grp_src_delete_marked(pg)) 2187 changed = true; 2188 2189 return changed; 2190 } 2191 2192 static bool br_multicast_isexc(const struct net_bridge_mcast *brmctx, 2193 struct net_bridge_port_group *pg, void *h_addr, 2194 void *srcs, u32 nsrcs, size_t addr_size, 2195 int grec_type) 2196 { 2197 bool changed = false; 2198 2199 switch (pg->filter_mode) { 2200 case MCAST_INCLUDE: 2201 __grp_src_isexc_incl(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2202 grec_type); 2203 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE); 2204 changed = true; 2205 break; 2206 case MCAST_EXCLUDE: 2207 changed = __grp_src_isexc_excl(brmctx, pg, h_addr, srcs, nsrcs, 2208 addr_size, grec_type); 2209 break; 2210 } 2211 2212 pg->filter_mode = MCAST_EXCLUDE; 2213 mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx)); 2214 2215 return changed; 2216 } 2217 2218 /* State Msg type New state Actions 2219 * INCLUDE (A) TO_IN (B) INCLUDE (A+B) (B)=GMI 2220 * Send Q(G,A-B) 2221 */ 2222 static bool __grp_src_toin_incl(struct net_bridge_mcast *brmctx, 2223 struct net_bridge_mcast_port *pmctx, 2224 struct net_bridge_port_group *pg, void *h_addr, 2225 void *srcs, u32 nsrcs, size_t addr_size, 2226 int grec_type) 2227 { 2228 u32 src_idx, to_send = pg->src_ents; 2229 struct net_bridge_group_src *ent; 2230 unsigned long now = jiffies; 2231 bool changed = false; 2232 struct br_ip src_ip; 2233 2234 hlist_for_each_entry(ent, &pg->src_list, node) 2235 ent->flags |= BR_SGRP_F_SEND; 2236 2237 memset(&src_ip, 0, sizeof(src_ip)); 2238 src_ip.proto = pg->key.addr.proto; 2239 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2240 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2241 ent = br_multicast_find_group_src(pg, &src_ip); 2242 if (ent) { 2243 ent->flags &= ~BR_SGRP_F_SEND; 2244 to_send--; 2245 } else { 2246 ent = br_multicast_new_group_src(pg, &src_ip); 2247 if (ent) 2248 changed = true; 2249 } 2250 if (ent) 2251 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx)); 2252 } 2253 2254 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2255 grec_type)) 2256 changed = true; 2257 2258 if (to_send) 2259 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2260 2261 return changed; 2262 } 2263 2264 /* State Msg type New state Actions 2265 * EXCLUDE (X,Y) TO_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI 2266 * Send Q(G,X-A) 2267 * Send Q(G) 2268 */ 2269 static bool __grp_src_toin_excl(struct net_bridge_mcast *brmctx, 2270 struct net_bridge_mcast_port *pmctx, 2271 struct net_bridge_port_group *pg, void *h_addr, 2272 void *srcs, u32 nsrcs, size_t addr_size, 2273 int grec_type) 2274 { 2275 u32 src_idx, to_send = pg->src_ents; 2276 struct net_bridge_group_src *ent; 2277 unsigned long now = jiffies; 2278 bool changed = false; 2279 struct br_ip src_ip; 2280 2281 hlist_for_each_entry(ent, &pg->src_list, node) 2282 if (timer_pending(&ent->timer)) 2283 ent->flags |= BR_SGRP_F_SEND; 2284 2285 memset(&src_ip, 0, sizeof(src_ip)); 2286 src_ip.proto = pg->key.addr.proto; 2287 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2288 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2289 ent = br_multicast_find_group_src(pg, &src_ip); 2290 if (ent) { 2291 if (timer_pending(&ent->timer)) { 2292 ent->flags &= ~BR_SGRP_F_SEND; 2293 to_send--; 2294 } 2295 } else { 2296 ent = br_multicast_new_group_src(pg, &src_ip); 2297 if (ent) 2298 changed = true; 2299 } 2300 if (ent) 2301 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx)); 2302 } 2303 2304 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2305 grec_type)) 2306 changed = true; 2307 2308 if (to_send) 2309 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2310 2311 __grp_send_query_and_rexmit(brmctx, pmctx, pg); 2312 2313 return changed; 2314 } 2315 2316 static bool br_multicast_toin(struct net_bridge_mcast *brmctx, 2317 struct net_bridge_mcast_port *pmctx, 2318 struct net_bridge_port_group *pg, void *h_addr, 2319 void *srcs, u32 nsrcs, size_t addr_size, 2320 int grec_type) 2321 { 2322 bool changed = false; 2323 2324 switch (pg->filter_mode) { 2325 case MCAST_INCLUDE: 2326 changed = __grp_src_toin_incl(brmctx, pmctx, pg, h_addr, srcs, 2327 nsrcs, addr_size, grec_type); 2328 break; 2329 case MCAST_EXCLUDE: 2330 changed = __grp_src_toin_excl(brmctx, pmctx, pg, h_addr, srcs, 2331 nsrcs, addr_size, grec_type); 2332 break; 2333 } 2334 2335 if (br_multicast_eht_should_del_pg(pg)) { 2336 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE; 2337 br_multicast_find_del_pg(pg->key.port->br, pg); 2338 /* a notification has already been sent and we shouldn't 2339 * access pg after the delete so we have to return false 2340 */ 2341 changed = false; 2342 } 2343 2344 return changed; 2345 } 2346 2347 /* State Msg type New state Actions 2348 * INCLUDE (A) TO_EX (B) EXCLUDE (A*B,B-A) (B-A)=0 2349 * Delete (A-B) 2350 * Send Q(G,A*B) 2351 * Group Timer=GMI 2352 */ 2353 static void __grp_src_toex_incl(struct net_bridge_mcast *brmctx, 2354 struct net_bridge_mcast_port *pmctx, 2355 struct net_bridge_port_group *pg, void *h_addr, 2356 void *srcs, u32 nsrcs, size_t addr_size, 2357 int grec_type) 2358 { 2359 struct net_bridge_group_src *ent; 2360 u32 src_idx, to_send = 0; 2361 struct br_ip src_ip; 2362 2363 hlist_for_each_entry(ent, &pg->src_list, node) 2364 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE; 2365 2366 memset(&src_ip, 0, sizeof(src_ip)); 2367 src_ip.proto = pg->key.addr.proto; 2368 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2369 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2370 ent = br_multicast_find_group_src(pg, &src_ip); 2371 if (ent) { 2372 ent->flags = (ent->flags & ~BR_SGRP_F_DELETE) | 2373 BR_SGRP_F_SEND; 2374 to_send++; 2375 } else { 2376 ent = br_multicast_new_group_src(pg, &src_ip); 2377 } 2378 if (ent) 2379 br_multicast_fwd_src_handle(ent); 2380 } 2381 2382 br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2383 grec_type); 2384 2385 __grp_src_delete_marked(pg); 2386 if (to_send) 2387 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2388 } 2389 2390 /* State Msg type New state Actions 2391 * EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=Group Timer 2392 * Delete (X-A) 2393 * Delete (Y-A) 2394 * Send Q(G,A-Y) 2395 * Group Timer=GMI 2396 */ 2397 static bool __grp_src_toex_excl(struct net_bridge_mcast *brmctx, 2398 struct net_bridge_mcast_port *pmctx, 2399 struct net_bridge_port_group *pg, void *h_addr, 2400 void *srcs, u32 nsrcs, size_t addr_size, 2401 int grec_type) 2402 { 2403 struct net_bridge_group_src *ent; 2404 u32 src_idx, to_send = 0; 2405 bool changed = false; 2406 struct br_ip src_ip; 2407 2408 hlist_for_each_entry(ent, &pg->src_list, node) 2409 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE; 2410 2411 memset(&src_ip, 0, sizeof(src_ip)); 2412 src_ip.proto = pg->key.addr.proto; 2413 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2414 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2415 ent = br_multicast_find_group_src(pg, &src_ip); 2416 if (ent) { 2417 ent->flags &= ~BR_SGRP_F_DELETE; 2418 } else { 2419 ent = br_multicast_new_group_src(pg, &src_ip); 2420 if (ent) { 2421 __grp_src_mod_timer(ent, pg->timer.expires); 2422 changed = true; 2423 } 2424 } 2425 if (ent && timer_pending(&ent->timer)) { 2426 ent->flags |= BR_SGRP_F_SEND; 2427 to_send++; 2428 } 2429 } 2430 2431 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2432 grec_type)) 2433 changed = true; 2434 2435 if (__grp_src_delete_marked(pg)) 2436 changed = true; 2437 if (to_send) 2438 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2439 2440 return changed; 2441 } 2442 2443 static bool br_multicast_toex(struct net_bridge_mcast *brmctx, 2444 struct net_bridge_mcast_port *pmctx, 2445 struct net_bridge_port_group *pg, void *h_addr, 2446 void *srcs, u32 nsrcs, size_t addr_size, 2447 int grec_type) 2448 { 2449 bool changed = false; 2450 2451 switch (pg->filter_mode) { 2452 case MCAST_INCLUDE: 2453 __grp_src_toex_incl(brmctx, pmctx, pg, h_addr, srcs, nsrcs, 2454 addr_size, grec_type); 2455 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE); 2456 changed = true; 2457 break; 2458 case MCAST_EXCLUDE: 2459 changed = __grp_src_toex_excl(brmctx, pmctx, pg, h_addr, srcs, 2460 nsrcs, addr_size, grec_type); 2461 break; 2462 } 2463 2464 pg->filter_mode = MCAST_EXCLUDE; 2465 mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx)); 2466 2467 return changed; 2468 } 2469 2470 /* State Msg type New state Actions 2471 * INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B) 2472 */ 2473 static bool __grp_src_block_incl(struct net_bridge_mcast *brmctx, 2474 struct net_bridge_mcast_port *pmctx, 2475 struct net_bridge_port_group *pg, void *h_addr, 2476 void *srcs, u32 nsrcs, size_t addr_size, int grec_type) 2477 { 2478 struct net_bridge_group_src *ent; 2479 u32 src_idx, to_send = 0; 2480 bool changed = false; 2481 struct br_ip src_ip; 2482 2483 hlist_for_each_entry(ent, &pg->src_list, node) 2484 ent->flags &= ~BR_SGRP_F_SEND; 2485 2486 memset(&src_ip, 0, sizeof(src_ip)); 2487 src_ip.proto = pg->key.addr.proto; 2488 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2489 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2490 ent = br_multicast_find_group_src(pg, &src_ip); 2491 if (ent) { 2492 ent->flags |= BR_SGRP_F_SEND; 2493 to_send++; 2494 } 2495 } 2496 2497 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2498 grec_type)) 2499 changed = true; 2500 2501 if (to_send) 2502 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2503 2504 return changed; 2505 } 2506 2507 /* State Msg type New state Actions 2508 * EXCLUDE (X,Y) BLOCK (A) EXCLUDE (X+(A-Y),Y) (A-X-Y)=Group Timer 2509 * Send Q(G,A-Y) 2510 */ 2511 static bool __grp_src_block_excl(struct net_bridge_mcast *brmctx, 2512 struct net_bridge_mcast_port *pmctx, 2513 struct net_bridge_port_group *pg, void *h_addr, 2514 void *srcs, u32 nsrcs, size_t addr_size, int grec_type) 2515 { 2516 struct net_bridge_group_src *ent; 2517 u32 src_idx, to_send = 0; 2518 bool changed = false; 2519 struct br_ip src_ip; 2520 2521 hlist_for_each_entry(ent, &pg->src_list, node) 2522 ent->flags &= ~BR_SGRP_F_SEND; 2523 2524 memset(&src_ip, 0, sizeof(src_ip)); 2525 src_ip.proto = pg->key.addr.proto; 2526 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2527 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2528 ent = br_multicast_find_group_src(pg, &src_ip); 2529 if (!ent) { 2530 ent = br_multicast_new_group_src(pg, &src_ip); 2531 if (ent) { 2532 __grp_src_mod_timer(ent, pg->timer.expires); 2533 changed = true; 2534 } 2535 } 2536 if (ent && timer_pending(&ent->timer)) { 2537 ent->flags |= BR_SGRP_F_SEND; 2538 to_send++; 2539 } 2540 } 2541 2542 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2543 grec_type)) 2544 changed = true; 2545 2546 if (to_send) 2547 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2548 2549 return changed; 2550 } 2551 2552 static bool br_multicast_block(struct net_bridge_mcast *brmctx, 2553 struct net_bridge_mcast_port *pmctx, 2554 struct net_bridge_port_group *pg, void *h_addr, 2555 void *srcs, u32 nsrcs, size_t addr_size, int grec_type) 2556 { 2557 bool changed = false; 2558 2559 switch (pg->filter_mode) { 2560 case MCAST_INCLUDE: 2561 changed = __grp_src_block_incl(brmctx, pmctx, pg, h_addr, srcs, 2562 nsrcs, addr_size, grec_type); 2563 break; 2564 case MCAST_EXCLUDE: 2565 changed = __grp_src_block_excl(brmctx, pmctx, pg, h_addr, srcs, 2566 nsrcs, addr_size, grec_type); 2567 break; 2568 } 2569 2570 if ((pg->filter_mode == MCAST_INCLUDE && hlist_empty(&pg->src_list)) || 2571 br_multicast_eht_should_del_pg(pg)) { 2572 if (br_multicast_eht_should_del_pg(pg)) 2573 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE; 2574 br_multicast_find_del_pg(pg->key.port->br, pg); 2575 /* a notification has already been sent and we shouldn't 2576 * access pg after the delete so we have to return false 2577 */ 2578 changed = false; 2579 } 2580 2581 return changed; 2582 } 2583 2584 static struct net_bridge_port_group * 2585 br_multicast_find_port(struct net_bridge_mdb_entry *mp, 2586 struct net_bridge_port *p, 2587 const unsigned char *src) 2588 { 2589 struct net_bridge *br __maybe_unused = mp->br; 2590 struct net_bridge_port_group *pg; 2591 2592 for (pg = mlock_dereference(mp->ports, br); 2593 pg; 2594 pg = mlock_dereference(pg->next, br)) 2595 if (br_port_group_equal(pg, p, src)) 2596 return pg; 2597 2598 return NULL; 2599 } 2600 2601 static int br_ip4_multicast_igmp3_report(struct net_bridge_mcast *brmctx, 2602 struct net_bridge_mcast_port *pmctx, 2603 struct sk_buff *skb, 2604 u16 vid) 2605 { 2606 bool igmpv2 = brmctx->multicast_igmp_version == 2; 2607 struct net_bridge_mdb_entry *mdst; 2608 struct net_bridge_port_group *pg; 2609 const unsigned char *src; 2610 struct igmpv3_report *ih; 2611 struct igmpv3_grec *grec; 2612 int i, len, num, type; 2613 __be32 group, *h_addr; 2614 bool changed = false; 2615 int err = 0; 2616 u16 nsrcs; 2617 2618 ih = igmpv3_report_hdr(skb); 2619 num = ntohs(ih->ngrec); 2620 len = skb_transport_offset(skb) + sizeof(*ih); 2621 2622 for (i = 0; i < num; i++) { 2623 len += sizeof(*grec); 2624 if (!ip_mc_may_pull(skb, len)) 2625 return -EINVAL; 2626 2627 grec = (void *)(skb->data + len - sizeof(*grec)); 2628 group = grec->grec_mca; 2629 type = grec->grec_type; 2630 nsrcs = ntohs(grec->grec_nsrcs); 2631 2632 len += nsrcs * 4; 2633 if (!ip_mc_may_pull(skb, len)) 2634 return -EINVAL; 2635 2636 switch (type) { 2637 case IGMPV3_MODE_IS_INCLUDE: 2638 case IGMPV3_MODE_IS_EXCLUDE: 2639 case IGMPV3_CHANGE_TO_INCLUDE: 2640 case IGMPV3_CHANGE_TO_EXCLUDE: 2641 case IGMPV3_ALLOW_NEW_SOURCES: 2642 case IGMPV3_BLOCK_OLD_SOURCES: 2643 break; 2644 2645 default: 2646 continue; 2647 } 2648 2649 src = eth_hdr(skb)->h_source; 2650 if (nsrcs == 0 && 2651 (type == IGMPV3_CHANGE_TO_INCLUDE || 2652 type == IGMPV3_MODE_IS_INCLUDE)) { 2653 if (!pmctx || igmpv2) { 2654 br_ip4_multicast_leave_group(brmctx, pmctx, 2655 group, vid, src); 2656 continue; 2657 } 2658 } else { 2659 err = br_ip4_multicast_add_group(brmctx, pmctx, group, 2660 vid, src, igmpv2); 2661 if (err) 2662 break; 2663 } 2664 2665 if (!pmctx || igmpv2) 2666 continue; 2667 2668 spin_lock_bh(&brmctx->br->multicast_lock); 2669 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 2670 goto unlock_continue; 2671 2672 mdst = br_mdb_ip4_get(brmctx->br, group, vid); 2673 if (!mdst) 2674 goto unlock_continue; 2675 pg = br_multicast_find_port(mdst, pmctx->port, src); 2676 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT)) 2677 goto unlock_continue; 2678 /* reload grec and host addr */ 2679 grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4)); 2680 h_addr = &ip_hdr(skb)->saddr; 2681 switch (type) { 2682 case IGMPV3_ALLOW_NEW_SOURCES: 2683 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 2684 grec->grec_src, 2685 nsrcs, sizeof(__be32), type); 2686 break; 2687 case IGMPV3_MODE_IS_INCLUDE: 2688 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 2689 grec->grec_src, 2690 nsrcs, sizeof(__be32), type); 2691 break; 2692 case IGMPV3_MODE_IS_EXCLUDE: 2693 changed = br_multicast_isexc(brmctx, pg, h_addr, 2694 grec->grec_src, 2695 nsrcs, sizeof(__be32), type); 2696 break; 2697 case IGMPV3_CHANGE_TO_INCLUDE: 2698 changed = br_multicast_toin(brmctx, pmctx, pg, h_addr, 2699 grec->grec_src, 2700 nsrcs, sizeof(__be32), type); 2701 break; 2702 case IGMPV3_CHANGE_TO_EXCLUDE: 2703 changed = br_multicast_toex(brmctx, pmctx, pg, h_addr, 2704 grec->grec_src, 2705 nsrcs, sizeof(__be32), type); 2706 break; 2707 case IGMPV3_BLOCK_OLD_SOURCES: 2708 changed = br_multicast_block(brmctx, pmctx, pg, h_addr, 2709 grec->grec_src, 2710 nsrcs, sizeof(__be32), type); 2711 break; 2712 } 2713 if (changed) 2714 br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB); 2715 unlock_continue: 2716 spin_unlock_bh(&brmctx->br->multicast_lock); 2717 } 2718 2719 return err; 2720 } 2721 2722 #if IS_ENABLED(CONFIG_IPV6) 2723 static int br_ip6_multicast_mld2_report(struct net_bridge_mcast *brmctx, 2724 struct net_bridge_mcast_port *pmctx, 2725 struct sk_buff *skb, 2726 u16 vid) 2727 { 2728 bool mldv1 = brmctx->multicast_mld_version == 1; 2729 struct net_bridge_mdb_entry *mdst; 2730 struct net_bridge_port_group *pg; 2731 unsigned int nsrcs_offset; 2732 struct mld2_report *mld2r; 2733 const unsigned char *src; 2734 struct in6_addr *h_addr; 2735 struct mld2_grec *grec; 2736 unsigned int grec_len; 2737 bool changed = false; 2738 int i, len, num; 2739 int err = 0; 2740 2741 if (!ipv6_mc_may_pull(skb, sizeof(*mld2r))) 2742 return -EINVAL; 2743 2744 mld2r = (struct mld2_report *)icmp6_hdr(skb); 2745 num = ntohs(mld2r->mld2r_ngrec); 2746 len = skb_transport_offset(skb) + sizeof(*mld2r); 2747 2748 for (i = 0; i < num; i++) { 2749 __be16 *_nsrcs, __nsrcs; 2750 u16 nsrcs; 2751 2752 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs); 2753 2754 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < 2755 nsrcs_offset + sizeof(__nsrcs)) 2756 return -EINVAL; 2757 2758 _nsrcs = skb_header_pointer(skb, nsrcs_offset, 2759 sizeof(__nsrcs), &__nsrcs); 2760 if (!_nsrcs) 2761 return -EINVAL; 2762 2763 nsrcs = ntohs(*_nsrcs); 2764 grec_len = struct_size(grec, grec_src, nsrcs); 2765 2766 if (!ipv6_mc_may_pull(skb, len + grec_len)) 2767 return -EINVAL; 2768 2769 grec = (struct mld2_grec *)(skb->data + len); 2770 len += grec_len; 2771 2772 switch (grec->grec_type) { 2773 case MLD2_MODE_IS_INCLUDE: 2774 case MLD2_MODE_IS_EXCLUDE: 2775 case MLD2_CHANGE_TO_INCLUDE: 2776 case MLD2_CHANGE_TO_EXCLUDE: 2777 case MLD2_ALLOW_NEW_SOURCES: 2778 case MLD2_BLOCK_OLD_SOURCES: 2779 break; 2780 2781 default: 2782 continue; 2783 } 2784 2785 src = eth_hdr(skb)->h_source; 2786 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE || 2787 grec->grec_type == MLD2_MODE_IS_INCLUDE) && 2788 nsrcs == 0) { 2789 if (!pmctx || mldv1) { 2790 br_ip6_multicast_leave_group(brmctx, pmctx, 2791 &grec->grec_mca, 2792 vid, src); 2793 continue; 2794 } 2795 } else { 2796 err = br_ip6_multicast_add_group(brmctx, pmctx, 2797 &grec->grec_mca, vid, 2798 src, mldv1); 2799 if (err) 2800 break; 2801 } 2802 2803 if (!pmctx || mldv1) 2804 continue; 2805 2806 spin_lock_bh(&brmctx->br->multicast_lock); 2807 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 2808 goto unlock_continue; 2809 2810 mdst = br_mdb_ip6_get(brmctx->br, &grec->grec_mca, vid); 2811 if (!mdst) 2812 goto unlock_continue; 2813 pg = br_multicast_find_port(mdst, pmctx->port, src); 2814 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT)) 2815 goto unlock_continue; 2816 h_addr = &ipv6_hdr(skb)->saddr; 2817 switch (grec->grec_type) { 2818 case MLD2_ALLOW_NEW_SOURCES: 2819 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 2820 grec->grec_src, nsrcs, 2821 sizeof(struct in6_addr), 2822 grec->grec_type); 2823 break; 2824 case MLD2_MODE_IS_INCLUDE: 2825 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 2826 grec->grec_src, nsrcs, 2827 sizeof(struct in6_addr), 2828 grec->grec_type); 2829 break; 2830 case MLD2_MODE_IS_EXCLUDE: 2831 changed = br_multicast_isexc(brmctx, pg, h_addr, 2832 grec->grec_src, nsrcs, 2833 sizeof(struct in6_addr), 2834 grec->grec_type); 2835 break; 2836 case MLD2_CHANGE_TO_INCLUDE: 2837 changed = br_multicast_toin(brmctx, pmctx, pg, h_addr, 2838 grec->grec_src, nsrcs, 2839 sizeof(struct in6_addr), 2840 grec->grec_type); 2841 break; 2842 case MLD2_CHANGE_TO_EXCLUDE: 2843 changed = br_multicast_toex(brmctx, pmctx, pg, h_addr, 2844 grec->grec_src, nsrcs, 2845 sizeof(struct in6_addr), 2846 grec->grec_type); 2847 break; 2848 case MLD2_BLOCK_OLD_SOURCES: 2849 changed = br_multicast_block(brmctx, pmctx, pg, h_addr, 2850 grec->grec_src, nsrcs, 2851 sizeof(struct in6_addr), 2852 grec->grec_type); 2853 break; 2854 } 2855 if (changed) 2856 br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB); 2857 unlock_continue: 2858 spin_unlock_bh(&brmctx->br->multicast_lock); 2859 } 2860 2861 return err; 2862 } 2863 #endif 2864 2865 static bool br_multicast_select_querier(struct net_bridge_mcast *brmctx, 2866 struct net_bridge_mcast_port *pmctx, 2867 struct br_ip *saddr) 2868 { 2869 int port_ifidx = pmctx ? pmctx->port->dev->ifindex : 0; 2870 struct timer_list *own_timer, *other_timer; 2871 struct bridge_mcast_querier *querier; 2872 2873 switch (saddr->proto) { 2874 case htons(ETH_P_IP): 2875 querier = &brmctx->ip4_querier; 2876 own_timer = &brmctx->ip4_own_query.timer; 2877 other_timer = &brmctx->ip4_other_query.timer; 2878 if (!querier->addr.src.ip4 || 2879 ntohl(saddr->src.ip4) <= ntohl(querier->addr.src.ip4)) 2880 goto update; 2881 break; 2882 #if IS_ENABLED(CONFIG_IPV6) 2883 case htons(ETH_P_IPV6): 2884 querier = &brmctx->ip6_querier; 2885 own_timer = &brmctx->ip6_own_query.timer; 2886 other_timer = &brmctx->ip6_other_query.timer; 2887 if (ipv6_addr_cmp(&saddr->src.ip6, &querier->addr.src.ip6) <= 0) 2888 goto update; 2889 break; 2890 #endif 2891 default: 2892 return false; 2893 } 2894 2895 if (!timer_pending(own_timer) && !timer_pending(other_timer)) 2896 goto update; 2897 2898 return false; 2899 2900 update: 2901 br_multicast_update_querier(brmctx, querier, port_ifidx, saddr); 2902 2903 return true; 2904 } 2905 2906 static struct net_bridge_port * 2907 __br_multicast_get_querier_port(struct net_bridge *br, 2908 const struct bridge_mcast_querier *querier) 2909 { 2910 int port_ifidx = READ_ONCE(querier->port_ifidx); 2911 struct net_bridge_port *p; 2912 struct net_device *dev; 2913 2914 if (port_ifidx == 0) 2915 return NULL; 2916 2917 dev = dev_get_by_index_rcu(dev_net(br->dev), port_ifidx); 2918 if (!dev) 2919 return NULL; 2920 p = br_port_get_rtnl_rcu(dev); 2921 if (!p || p->br != br) 2922 return NULL; 2923 2924 return p; 2925 } 2926 2927 size_t br_multicast_querier_state_size(void) 2928 { 2929 return nla_total_size(0) + /* nest attribute */ 2930 nla_total_size(sizeof(__be32)) + /* BRIDGE_QUERIER_IP_ADDRESS */ 2931 nla_total_size(sizeof(int)) + /* BRIDGE_QUERIER_IP_PORT */ 2932 nla_total_size_64bit(sizeof(u64)) + /* BRIDGE_QUERIER_IP_OTHER_TIMER */ 2933 #if IS_ENABLED(CONFIG_IPV6) 2934 nla_total_size(sizeof(struct in6_addr)) + /* BRIDGE_QUERIER_IPV6_ADDRESS */ 2935 nla_total_size(sizeof(int)) + /* BRIDGE_QUERIER_IPV6_PORT */ 2936 nla_total_size_64bit(sizeof(u64)) + /* BRIDGE_QUERIER_IPV6_OTHER_TIMER */ 2937 #endif 2938 0; 2939 } 2940 2941 /* protected by rtnl or rcu */ 2942 int br_multicast_dump_querier_state(struct sk_buff *skb, 2943 const struct net_bridge_mcast *brmctx, 2944 int nest_attr) 2945 { 2946 struct bridge_mcast_querier querier = {}; 2947 struct net_bridge_port *p; 2948 struct nlattr *nest; 2949 2950 if (!br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) || 2951 br_multicast_ctx_vlan_global_disabled(brmctx)) 2952 return 0; 2953 2954 nest = nla_nest_start(skb, nest_attr); 2955 if (!nest) 2956 return -EMSGSIZE; 2957 2958 rcu_read_lock(); 2959 if (!brmctx->multicast_querier && 2960 !timer_pending(&brmctx->ip4_other_query.timer)) 2961 goto out_v6; 2962 2963 br_multicast_read_querier(&brmctx->ip4_querier, &querier); 2964 if (nla_put_in_addr(skb, BRIDGE_QUERIER_IP_ADDRESS, 2965 querier.addr.src.ip4)) { 2966 rcu_read_unlock(); 2967 goto out_err; 2968 } 2969 2970 p = __br_multicast_get_querier_port(brmctx->br, &querier); 2971 if (timer_pending(&brmctx->ip4_other_query.timer) && 2972 (nla_put_u64_64bit(skb, BRIDGE_QUERIER_IP_OTHER_TIMER, 2973 br_timer_value(&brmctx->ip4_other_query.timer), 2974 BRIDGE_QUERIER_PAD) || 2975 (p && nla_put_u32(skb, BRIDGE_QUERIER_IP_PORT, p->dev->ifindex)))) { 2976 rcu_read_unlock(); 2977 goto out_err; 2978 } 2979 2980 out_v6: 2981 #if IS_ENABLED(CONFIG_IPV6) 2982 if (!brmctx->multicast_querier && 2983 !timer_pending(&brmctx->ip6_other_query.timer)) 2984 goto out; 2985 2986 br_multicast_read_querier(&brmctx->ip6_querier, &querier); 2987 if (nla_put_in6_addr(skb, BRIDGE_QUERIER_IPV6_ADDRESS, 2988 &querier.addr.src.ip6)) { 2989 rcu_read_unlock(); 2990 goto out_err; 2991 } 2992 2993 p = __br_multicast_get_querier_port(brmctx->br, &querier); 2994 if (timer_pending(&brmctx->ip6_other_query.timer) && 2995 (nla_put_u64_64bit(skb, BRIDGE_QUERIER_IPV6_OTHER_TIMER, 2996 br_timer_value(&brmctx->ip6_other_query.timer), 2997 BRIDGE_QUERIER_PAD) || 2998 (p && nla_put_u32(skb, BRIDGE_QUERIER_IPV6_PORT, 2999 p->dev->ifindex)))) { 3000 rcu_read_unlock(); 3001 goto out_err; 3002 } 3003 out: 3004 #endif 3005 rcu_read_unlock(); 3006 nla_nest_end(skb, nest); 3007 if (!nla_len(nest)) 3008 nla_nest_cancel(skb, nest); 3009 3010 return 0; 3011 3012 out_err: 3013 nla_nest_cancel(skb, nest); 3014 return -EMSGSIZE; 3015 } 3016 3017 static void 3018 br_multicast_update_query_timer(struct net_bridge_mcast *brmctx, 3019 struct bridge_mcast_other_query *query, 3020 unsigned long max_delay) 3021 { 3022 if (!timer_pending(&query->timer)) 3023 query->delay_time = jiffies + max_delay; 3024 3025 mod_timer(&query->timer, jiffies + brmctx->multicast_querier_interval); 3026 } 3027 3028 static void br_port_mc_router_state_change(struct net_bridge_port *p, 3029 bool is_mc_router) 3030 { 3031 struct switchdev_attr attr = { 3032 .orig_dev = p->dev, 3033 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER, 3034 .flags = SWITCHDEV_F_DEFER, 3035 .u.mrouter = is_mc_router, 3036 }; 3037 3038 switchdev_port_attr_set(p->dev, &attr, NULL); 3039 } 3040 3041 static struct net_bridge_port * 3042 br_multicast_rport_from_node(struct net_bridge_mcast *brmctx, 3043 struct hlist_head *mc_router_list, 3044 struct hlist_node *rlist) 3045 { 3046 struct net_bridge_mcast_port *pmctx; 3047 3048 #if IS_ENABLED(CONFIG_IPV6) 3049 if (mc_router_list == &brmctx->ip6_mc_router_list) 3050 pmctx = hlist_entry(rlist, struct net_bridge_mcast_port, 3051 ip6_rlist); 3052 else 3053 #endif 3054 pmctx = hlist_entry(rlist, struct net_bridge_mcast_port, 3055 ip4_rlist); 3056 3057 return pmctx->port; 3058 } 3059 3060 static struct hlist_node * 3061 br_multicast_get_rport_slot(struct net_bridge_mcast *brmctx, 3062 struct net_bridge_port *port, 3063 struct hlist_head *mc_router_list) 3064 3065 { 3066 struct hlist_node *slot = NULL; 3067 struct net_bridge_port *p; 3068 struct hlist_node *rlist; 3069 3070 hlist_for_each(rlist, mc_router_list) { 3071 p = br_multicast_rport_from_node(brmctx, mc_router_list, rlist); 3072 3073 if ((unsigned long)port >= (unsigned long)p) 3074 break; 3075 3076 slot = rlist; 3077 } 3078 3079 return slot; 3080 } 3081 3082 static bool br_multicast_no_router_otherpf(struct net_bridge_mcast_port *pmctx, 3083 struct hlist_node *rnode) 3084 { 3085 #if IS_ENABLED(CONFIG_IPV6) 3086 if (rnode != &pmctx->ip6_rlist) 3087 return hlist_unhashed(&pmctx->ip6_rlist); 3088 else 3089 return hlist_unhashed(&pmctx->ip4_rlist); 3090 #else 3091 return true; 3092 #endif 3093 } 3094 3095 /* Add port to router_list 3096 * list is maintained ordered by pointer value 3097 * and locked by br->multicast_lock and RCU 3098 */ 3099 static void br_multicast_add_router(struct net_bridge_mcast *brmctx, 3100 struct net_bridge_mcast_port *pmctx, 3101 struct hlist_node *rlist, 3102 struct hlist_head *mc_router_list) 3103 { 3104 struct hlist_node *slot; 3105 3106 if (!hlist_unhashed(rlist)) 3107 return; 3108 3109 slot = br_multicast_get_rport_slot(brmctx, pmctx->port, mc_router_list); 3110 3111 if (slot) 3112 hlist_add_behind_rcu(rlist, slot); 3113 else 3114 hlist_add_head_rcu(rlist, mc_router_list); 3115 3116 /* For backwards compatibility for now, only notify if we 3117 * switched from no IPv4/IPv6 multicast router to a new 3118 * IPv4 or IPv6 multicast router. 3119 */ 3120 if (br_multicast_no_router_otherpf(pmctx, rlist)) { 3121 br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_NEWMDB); 3122 br_port_mc_router_state_change(pmctx->port, true); 3123 } 3124 } 3125 3126 /* Add port to router_list 3127 * list is maintained ordered by pointer value 3128 * and locked by br->multicast_lock and RCU 3129 */ 3130 static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx, 3131 struct net_bridge_mcast_port *pmctx) 3132 { 3133 br_multicast_add_router(brmctx, pmctx, &pmctx->ip4_rlist, 3134 &brmctx->ip4_mc_router_list); 3135 } 3136 3137 /* Add port to router_list 3138 * list is maintained ordered by pointer value 3139 * and locked by br->multicast_lock and RCU 3140 */ 3141 static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx, 3142 struct net_bridge_mcast_port *pmctx) 3143 { 3144 #if IS_ENABLED(CONFIG_IPV6) 3145 br_multicast_add_router(brmctx, pmctx, &pmctx->ip6_rlist, 3146 &brmctx->ip6_mc_router_list); 3147 #endif 3148 } 3149 3150 static void br_multicast_mark_router(struct net_bridge_mcast *brmctx, 3151 struct net_bridge_mcast_port *pmctx, 3152 struct timer_list *timer, 3153 struct hlist_node *rlist, 3154 struct hlist_head *mc_router_list) 3155 { 3156 unsigned long now = jiffies; 3157 3158 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3159 return; 3160 3161 if (!pmctx) { 3162 if (brmctx->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) { 3163 if (!br_ip4_multicast_is_router(brmctx) && 3164 !br_ip6_multicast_is_router(brmctx)) 3165 br_mc_router_state_change(brmctx->br, true); 3166 mod_timer(timer, now + brmctx->multicast_querier_interval); 3167 } 3168 return; 3169 } 3170 3171 if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED || 3172 pmctx->multicast_router == MDB_RTR_TYPE_PERM) 3173 return; 3174 3175 br_multicast_add_router(brmctx, pmctx, rlist, mc_router_list); 3176 mod_timer(timer, now + brmctx->multicast_querier_interval); 3177 } 3178 3179 static void br_ip4_multicast_mark_router(struct net_bridge_mcast *brmctx, 3180 struct net_bridge_mcast_port *pmctx) 3181 { 3182 struct timer_list *timer = &brmctx->ip4_mc_router_timer; 3183 struct hlist_node *rlist = NULL; 3184 3185 if (pmctx) { 3186 timer = &pmctx->ip4_mc_router_timer; 3187 rlist = &pmctx->ip4_rlist; 3188 } 3189 3190 br_multicast_mark_router(brmctx, pmctx, timer, rlist, 3191 &brmctx->ip4_mc_router_list); 3192 } 3193 3194 static void br_ip6_multicast_mark_router(struct net_bridge_mcast *brmctx, 3195 struct net_bridge_mcast_port *pmctx) 3196 { 3197 #if IS_ENABLED(CONFIG_IPV6) 3198 struct timer_list *timer = &brmctx->ip6_mc_router_timer; 3199 struct hlist_node *rlist = NULL; 3200 3201 if (pmctx) { 3202 timer = &pmctx->ip6_mc_router_timer; 3203 rlist = &pmctx->ip6_rlist; 3204 } 3205 3206 br_multicast_mark_router(brmctx, pmctx, timer, rlist, 3207 &brmctx->ip6_mc_router_list); 3208 #endif 3209 } 3210 3211 static void 3212 br_ip4_multicast_query_received(struct net_bridge_mcast *brmctx, 3213 struct net_bridge_mcast_port *pmctx, 3214 struct bridge_mcast_other_query *query, 3215 struct br_ip *saddr, 3216 unsigned long max_delay) 3217 { 3218 if (!br_multicast_select_querier(brmctx, pmctx, saddr)) 3219 return; 3220 3221 br_multicast_update_query_timer(brmctx, query, max_delay); 3222 br_ip4_multicast_mark_router(brmctx, pmctx); 3223 } 3224 3225 #if IS_ENABLED(CONFIG_IPV6) 3226 static void 3227 br_ip6_multicast_query_received(struct net_bridge_mcast *brmctx, 3228 struct net_bridge_mcast_port *pmctx, 3229 struct bridge_mcast_other_query *query, 3230 struct br_ip *saddr, 3231 unsigned long max_delay) 3232 { 3233 if (!br_multicast_select_querier(brmctx, pmctx, saddr)) 3234 return; 3235 3236 br_multicast_update_query_timer(brmctx, query, max_delay); 3237 br_ip6_multicast_mark_router(brmctx, pmctx); 3238 } 3239 #endif 3240 3241 static void br_ip4_multicast_query(struct net_bridge_mcast *brmctx, 3242 struct net_bridge_mcast_port *pmctx, 3243 struct sk_buff *skb, 3244 u16 vid) 3245 { 3246 unsigned int transport_len = ip_transport_len(skb); 3247 const struct iphdr *iph = ip_hdr(skb); 3248 struct igmphdr *ih = igmp_hdr(skb); 3249 struct net_bridge_mdb_entry *mp; 3250 struct igmpv3_query *ih3; 3251 struct net_bridge_port_group *p; 3252 struct net_bridge_port_group __rcu **pp; 3253 struct br_ip saddr = {}; 3254 unsigned long max_delay; 3255 unsigned long now = jiffies; 3256 __be32 group; 3257 3258 spin_lock(&brmctx->br->multicast_lock); 3259 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3260 goto out; 3261 3262 group = ih->group; 3263 3264 if (transport_len == sizeof(*ih)) { 3265 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 3266 3267 if (!max_delay) { 3268 max_delay = 10 * HZ; 3269 group = 0; 3270 } 3271 } else if (transport_len >= sizeof(*ih3)) { 3272 ih3 = igmpv3_query_hdr(skb); 3273 if (ih3->nsrcs || 3274 (brmctx->multicast_igmp_version == 3 && group && 3275 ih3->suppress)) 3276 goto out; 3277 3278 max_delay = ih3->code ? 3279 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 3280 } else { 3281 goto out; 3282 } 3283 3284 if (!group) { 3285 saddr.proto = htons(ETH_P_IP); 3286 saddr.src.ip4 = iph->saddr; 3287 3288 br_ip4_multicast_query_received(brmctx, pmctx, 3289 &brmctx->ip4_other_query, 3290 &saddr, max_delay); 3291 goto out; 3292 } 3293 3294 mp = br_mdb_ip4_get(brmctx->br, group, vid); 3295 if (!mp) 3296 goto out; 3297 3298 max_delay *= brmctx->multicast_last_member_count; 3299 3300 if (mp->host_joined && 3301 (timer_pending(&mp->timer) ? 3302 time_after(mp->timer.expires, now + max_delay) : 3303 try_to_del_timer_sync(&mp->timer) >= 0)) 3304 mod_timer(&mp->timer, now + max_delay); 3305 3306 for (pp = &mp->ports; 3307 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 3308 pp = &p->next) { 3309 if (timer_pending(&p->timer) ? 3310 time_after(p->timer.expires, now + max_delay) : 3311 try_to_del_timer_sync(&p->timer) >= 0 && 3312 (brmctx->multicast_igmp_version == 2 || 3313 p->filter_mode == MCAST_EXCLUDE)) 3314 mod_timer(&p->timer, now + max_delay); 3315 } 3316 3317 out: 3318 spin_unlock(&brmctx->br->multicast_lock); 3319 } 3320 3321 #if IS_ENABLED(CONFIG_IPV6) 3322 static int br_ip6_multicast_query(struct net_bridge_mcast *brmctx, 3323 struct net_bridge_mcast_port *pmctx, 3324 struct sk_buff *skb, 3325 u16 vid) 3326 { 3327 unsigned int transport_len = ipv6_transport_len(skb); 3328 struct mld_msg *mld; 3329 struct net_bridge_mdb_entry *mp; 3330 struct mld2_query *mld2q; 3331 struct net_bridge_port_group *p; 3332 struct net_bridge_port_group __rcu **pp; 3333 struct br_ip saddr = {}; 3334 unsigned long max_delay; 3335 unsigned long now = jiffies; 3336 unsigned int offset = skb_transport_offset(skb); 3337 const struct in6_addr *group = NULL; 3338 bool is_general_query; 3339 int err = 0; 3340 3341 spin_lock(&brmctx->br->multicast_lock); 3342 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3343 goto out; 3344 3345 if (transport_len == sizeof(*mld)) { 3346 if (!pskb_may_pull(skb, offset + sizeof(*mld))) { 3347 err = -EINVAL; 3348 goto out; 3349 } 3350 mld = (struct mld_msg *) icmp6_hdr(skb); 3351 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); 3352 if (max_delay) 3353 group = &mld->mld_mca; 3354 } else { 3355 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) { 3356 err = -EINVAL; 3357 goto out; 3358 } 3359 mld2q = (struct mld2_query *)icmp6_hdr(skb); 3360 if (!mld2q->mld2q_nsrcs) 3361 group = &mld2q->mld2q_mca; 3362 if (brmctx->multicast_mld_version == 2 && 3363 !ipv6_addr_any(&mld2q->mld2q_mca) && 3364 mld2q->mld2q_suppress) 3365 goto out; 3366 3367 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); 3368 } 3369 3370 is_general_query = group && ipv6_addr_any(group); 3371 3372 if (is_general_query) { 3373 saddr.proto = htons(ETH_P_IPV6); 3374 saddr.src.ip6 = ipv6_hdr(skb)->saddr; 3375 3376 br_ip6_multicast_query_received(brmctx, pmctx, 3377 &brmctx->ip6_other_query, 3378 &saddr, max_delay); 3379 goto out; 3380 } else if (!group) { 3381 goto out; 3382 } 3383 3384 mp = br_mdb_ip6_get(brmctx->br, group, vid); 3385 if (!mp) 3386 goto out; 3387 3388 max_delay *= brmctx->multicast_last_member_count; 3389 if (mp->host_joined && 3390 (timer_pending(&mp->timer) ? 3391 time_after(mp->timer.expires, now + max_delay) : 3392 try_to_del_timer_sync(&mp->timer) >= 0)) 3393 mod_timer(&mp->timer, now + max_delay); 3394 3395 for (pp = &mp->ports; 3396 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 3397 pp = &p->next) { 3398 if (timer_pending(&p->timer) ? 3399 time_after(p->timer.expires, now + max_delay) : 3400 try_to_del_timer_sync(&p->timer) >= 0 && 3401 (brmctx->multicast_mld_version == 1 || 3402 p->filter_mode == MCAST_EXCLUDE)) 3403 mod_timer(&p->timer, now + max_delay); 3404 } 3405 3406 out: 3407 spin_unlock(&brmctx->br->multicast_lock); 3408 return err; 3409 } 3410 #endif 3411 3412 static void 3413 br_multicast_leave_group(struct net_bridge_mcast *brmctx, 3414 struct net_bridge_mcast_port *pmctx, 3415 struct br_ip *group, 3416 struct bridge_mcast_other_query *other_query, 3417 struct bridge_mcast_own_query *own_query, 3418 const unsigned char *src) 3419 { 3420 struct net_bridge_mdb_entry *mp; 3421 struct net_bridge_port_group *p; 3422 unsigned long now; 3423 unsigned long time; 3424 3425 spin_lock(&brmctx->br->multicast_lock); 3426 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3427 goto out; 3428 3429 mp = br_mdb_ip_get(brmctx->br, group); 3430 if (!mp) 3431 goto out; 3432 3433 if (pmctx && (pmctx->port->flags & BR_MULTICAST_FAST_LEAVE)) { 3434 struct net_bridge_port_group __rcu **pp; 3435 3436 for (pp = &mp->ports; 3437 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 3438 pp = &p->next) { 3439 if (!br_port_group_equal(p, pmctx->port, src)) 3440 continue; 3441 3442 if (p->flags & MDB_PG_FLAGS_PERMANENT) 3443 break; 3444 3445 p->flags |= MDB_PG_FLAGS_FAST_LEAVE; 3446 br_multicast_del_pg(mp, p, pp); 3447 } 3448 goto out; 3449 } 3450 3451 if (timer_pending(&other_query->timer)) 3452 goto out; 3453 3454 if (brmctx->multicast_querier) { 3455 __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &mp->addr, 3456 false, 0, NULL); 3457 3458 time = jiffies + brmctx->multicast_last_member_count * 3459 brmctx->multicast_last_member_interval; 3460 3461 mod_timer(&own_query->timer, time); 3462 3463 for (p = mlock_dereference(mp->ports, brmctx->br); 3464 p != NULL && pmctx != NULL; 3465 p = mlock_dereference(p->next, brmctx->br)) { 3466 if (!br_port_group_equal(p, pmctx->port, src)) 3467 continue; 3468 3469 if (!hlist_unhashed(&p->mglist) && 3470 (timer_pending(&p->timer) ? 3471 time_after(p->timer.expires, time) : 3472 try_to_del_timer_sync(&p->timer) >= 0)) { 3473 mod_timer(&p->timer, time); 3474 } 3475 3476 break; 3477 } 3478 } 3479 3480 now = jiffies; 3481 time = now + brmctx->multicast_last_member_count * 3482 brmctx->multicast_last_member_interval; 3483 3484 if (!pmctx) { 3485 if (mp->host_joined && 3486 (timer_pending(&mp->timer) ? 3487 time_after(mp->timer.expires, time) : 3488 try_to_del_timer_sync(&mp->timer) >= 0)) { 3489 mod_timer(&mp->timer, time); 3490 } 3491 3492 goto out; 3493 } 3494 3495 for (p = mlock_dereference(mp->ports, brmctx->br); 3496 p != NULL; 3497 p = mlock_dereference(p->next, brmctx->br)) { 3498 if (p->key.port != pmctx->port) 3499 continue; 3500 3501 if (!hlist_unhashed(&p->mglist) && 3502 (timer_pending(&p->timer) ? 3503 time_after(p->timer.expires, time) : 3504 try_to_del_timer_sync(&p->timer) >= 0)) { 3505 mod_timer(&p->timer, time); 3506 } 3507 3508 break; 3509 } 3510 out: 3511 spin_unlock(&brmctx->br->multicast_lock); 3512 } 3513 3514 static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx, 3515 struct net_bridge_mcast_port *pmctx, 3516 __be32 group, 3517 __u16 vid, 3518 const unsigned char *src) 3519 { 3520 struct br_ip br_group; 3521 struct bridge_mcast_own_query *own_query; 3522 3523 if (ipv4_is_local_multicast(group)) 3524 return; 3525 3526 own_query = pmctx ? &pmctx->ip4_own_query : &brmctx->ip4_own_query; 3527 3528 memset(&br_group, 0, sizeof(br_group)); 3529 br_group.dst.ip4 = group; 3530 br_group.proto = htons(ETH_P_IP); 3531 br_group.vid = vid; 3532 3533 br_multicast_leave_group(brmctx, pmctx, &br_group, 3534 &brmctx->ip4_other_query, 3535 own_query, src); 3536 } 3537 3538 #if IS_ENABLED(CONFIG_IPV6) 3539 static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx, 3540 struct net_bridge_mcast_port *pmctx, 3541 const struct in6_addr *group, 3542 __u16 vid, 3543 const unsigned char *src) 3544 { 3545 struct br_ip br_group; 3546 struct bridge_mcast_own_query *own_query; 3547 3548 if (ipv6_addr_is_ll_all_nodes(group)) 3549 return; 3550 3551 own_query = pmctx ? &pmctx->ip6_own_query : &brmctx->ip6_own_query; 3552 3553 memset(&br_group, 0, sizeof(br_group)); 3554 br_group.dst.ip6 = *group; 3555 br_group.proto = htons(ETH_P_IPV6); 3556 br_group.vid = vid; 3557 3558 br_multicast_leave_group(brmctx, pmctx, &br_group, 3559 &brmctx->ip6_other_query, 3560 own_query, src); 3561 } 3562 #endif 3563 3564 static void br_multicast_err_count(const struct net_bridge *br, 3565 const struct net_bridge_port *p, 3566 __be16 proto) 3567 { 3568 struct bridge_mcast_stats __percpu *stats; 3569 struct bridge_mcast_stats *pstats; 3570 3571 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 3572 return; 3573 3574 if (p) 3575 stats = p->mcast_stats; 3576 else 3577 stats = br->mcast_stats; 3578 if (WARN_ON(!stats)) 3579 return; 3580 3581 pstats = this_cpu_ptr(stats); 3582 3583 u64_stats_update_begin(&pstats->syncp); 3584 switch (proto) { 3585 case htons(ETH_P_IP): 3586 pstats->mstats.igmp_parse_errors++; 3587 break; 3588 #if IS_ENABLED(CONFIG_IPV6) 3589 case htons(ETH_P_IPV6): 3590 pstats->mstats.mld_parse_errors++; 3591 break; 3592 #endif 3593 } 3594 u64_stats_update_end(&pstats->syncp); 3595 } 3596 3597 static void br_multicast_pim(struct net_bridge_mcast *brmctx, 3598 struct net_bridge_mcast_port *pmctx, 3599 const struct sk_buff *skb) 3600 { 3601 unsigned int offset = skb_transport_offset(skb); 3602 struct pimhdr *pimhdr, _pimhdr; 3603 3604 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr); 3605 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION || 3606 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO) 3607 return; 3608 3609 spin_lock(&brmctx->br->multicast_lock); 3610 br_ip4_multicast_mark_router(brmctx, pmctx); 3611 spin_unlock(&brmctx->br->multicast_lock); 3612 } 3613 3614 static int br_ip4_multicast_mrd_rcv(struct net_bridge_mcast *brmctx, 3615 struct net_bridge_mcast_port *pmctx, 3616 struct sk_buff *skb) 3617 { 3618 if (ip_hdr(skb)->protocol != IPPROTO_IGMP || 3619 igmp_hdr(skb)->type != IGMP_MRDISC_ADV) 3620 return -ENOMSG; 3621 3622 spin_lock(&brmctx->br->multicast_lock); 3623 br_ip4_multicast_mark_router(brmctx, pmctx); 3624 spin_unlock(&brmctx->br->multicast_lock); 3625 3626 return 0; 3627 } 3628 3629 static int br_multicast_ipv4_rcv(struct net_bridge_mcast *brmctx, 3630 struct net_bridge_mcast_port *pmctx, 3631 struct sk_buff *skb, 3632 u16 vid) 3633 { 3634 struct net_bridge_port *p = pmctx ? pmctx->port : NULL; 3635 const unsigned char *src; 3636 struct igmphdr *ih; 3637 int err; 3638 3639 err = ip_mc_check_igmp(skb); 3640 3641 if (err == -ENOMSG) { 3642 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) { 3643 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 3644 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) { 3645 if (ip_hdr(skb)->protocol == IPPROTO_PIM) 3646 br_multicast_pim(brmctx, pmctx, skb); 3647 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) { 3648 br_ip4_multicast_mrd_rcv(brmctx, pmctx, skb); 3649 } 3650 3651 return 0; 3652 } else if (err < 0) { 3653 br_multicast_err_count(brmctx->br, p, skb->protocol); 3654 return err; 3655 } 3656 3657 ih = igmp_hdr(skb); 3658 src = eth_hdr(skb)->h_source; 3659 BR_INPUT_SKB_CB(skb)->igmp = ih->type; 3660 3661 switch (ih->type) { 3662 case IGMP_HOST_MEMBERSHIP_REPORT: 3663 case IGMPV2_HOST_MEMBERSHIP_REPORT: 3664 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 3665 err = br_ip4_multicast_add_group(brmctx, pmctx, ih->group, vid, 3666 src, true); 3667 break; 3668 case IGMPV3_HOST_MEMBERSHIP_REPORT: 3669 err = br_ip4_multicast_igmp3_report(brmctx, pmctx, skb, vid); 3670 break; 3671 case IGMP_HOST_MEMBERSHIP_QUERY: 3672 br_ip4_multicast_query(brmctx, pmctx, skb, vid); 3673 break; 3674 case IGMP_HOST_LEAVE_MESSAGE: 3675 br_ip4_multicast_leave_group(brmctx, pmctx, ih->group, vid, src); 3676 break; 3677 } 3678 3679 br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp, 3680 BR_MCAST_DIR_RX); 3681 3682 return err; 3683 } 3684 3685 #if IS_ENABLED(CONFIG_IPV6) 3686 static void br_ip6_multicast_mrd_rcv(struct net_bridge_mcast *brmctx, 3687 struct net_bridge_mcast_port *pmctx, 3688 struct sk_buff *skb) 3689 { 3690 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV) 3691 return; 3692 3693 spin_lock(&brmctx->br->multicast_lock); 3694 br_ip6_multicast_mark_router(brmctx, pmctx); 3695 spin_unlock(&brmctx->br->multicast_lock); 3696 } 3697 3698 static int br_multicast_ipv6_rcv(struct net_bridge_mcast *brmctx, 3699 struct net_bridge_mcast_port *pmctx, 3700 struct sk_buff *skb, 3701 u16 vid) 3702 { 3703 struct net_bridge_port *p = pmctx ? pmctx->port : NULL; 3704 const unsigned char *src; 3705 struct mld_msg *mld; 3706 int err; 3707 3708 err = ipv6_mc_check_mld(skb); 3709 3710 if (err == -ENOMSG || err == -ENODATA) { 3711 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr)) 3712 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 3713 if (err == -ENODATA && 3714 ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) 3715 br_ip6_multicast_mrd_rcv(brmctx, pmctx, skb); 3716 3717 return 0; 3718 } else if (err < 0) { 3719 br_multicast_err_count(brmctx->br, p, skb->protocol); 3720 return err; 3721 } 3722 3723 mld = (struct mld_msg *)skb_transport_header(skb); 3724 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type; 3725 3726 switch (mld->mld_type) { 3727 case ICMPV6_MGM_REPORT: 3728 src = eth_hdr(skb)->h_source; 3729 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 3730 err = br_ip6_multicast_add_group(brmctx, pmctx, &mld->mld_mca, 3731 vid, src, true); 3732 break; 3733 case ICMPV6_MLD2_REPORT: 3734 err = br_ip6_multicast_mld2_report(brmctx, pmctx, skb, vid); 3735 break; 3736 case ICMPV6_MGM_QUERY: 3737 err = br_ip6_multicast_query(brmctx, pmctx, skb, vid); 3738 break; 3739 case ICMPV6_MGM_REDUCTION: 3740 src = eth_hdr(skb)->h_source; 3741 br_ip6_multicast_leave_group(brmctx, pmctx, &mld->mld_mca, vid, 3742 src); 3743 break; 3744 } 3745 3746 br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp, 3747 BR_MCAST_DIR_RX); 3748 3749 return err; 3750 } 3751 #endif 3752 3753 int br_multicast_rcv(struct net_bridge_mcast **brmctx, 3754 struct net_bridge_mcast_port **pmctx, 3755 struct net_bridge_vlan *vlan, 3756 struct sk_buff *skb, u16 vid) 3757 { 3758 int ret = 0; 3759 3760 BR_INPUT_SKB_CB(skb)->igmp = 0; 3761 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 3762 3763 if (!br_opt_get((*brmctx)->br, BROPT_MULTICAST_ENABLED)) 3764 return 0; 3765 3766 if (br_opt_get((*brmctx)->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) && vlan) { 3767 const struct net_bridge_vlan *masterv; 3768 3769 /* the vlan has the master flag set only when transmitting 3770 * through the bridge device 3771 */ 3772 if (br_vlan_is_master(vlan)) { 3773 masterv = vlan; 3774 *brmctx = &vlan->br_mcast_ctx; 3775 *pmctx = NULL; 3776 } else { 3777 masterv = vlan->brvlan; 3778 *brmctx = &vlan->brvlan->br_mcast_ctx; 3779 *pmctx = &vlan->port_mcast_ctx; 3780 } 3781 3782 if (!(masterv->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED)) 3783 return 0; 3784 } 3785 3786 switch (skb->protocol) { 3787 case htons(ETH_P_IP): 3788 ret = br_multicast_ipv4_rcv(*brmctx, *pmctx, skb, vid); 3789 break; 3790 #if IS_ENABLED(CONFIG_IPV6) 3791 case htons(ETH_P_IPV6): 3792 ret = br_multicast_ipv6_rcv(*brmctx, *pmctx, skb, vid); 3793 break; 3794 #endif 3795 } 3796 3797 return ret; 3798 } 3799 3800 static void br_multicast_query_expired(struct net_bridge_mcast *brmctx, 3801 struct bridge_mcast_own_query *query, 3802 struct bridge_mcast_querier *querier) 3803 { 3804 spin_lock(&brmctx->br->multicast_lock); 3805 if (br_multicast_ctx_vlan_disabled(brmctx)) 3806 goto out; 3807 3808 if (query->startup_sent < brmctx->multicast_startup_query_count) 3809 query->startup_sent++; 3810 3811 br_multicast_send_query(brmctx, NULL, query); 3812 out: 3813 spin_unlock(&brmctx->br->multicast_lock); 3814 } 3815 3816 static void br_ip4_multicast_query_expired(struct timer_list *t) 3817 { 3818 struct net_bridge_mcast *brmctx = from_timer(brmctx, t, 3819 ip4_own_query.timer); 3820 3821 br_multicast_query_expired(brmctx, &brmctx->ip4_own_query, 3822 &brmctx->ip4_querier); 3823 } 3824 3825 #if IS_ENABLED(CONFIG_IPV6) 3826 static void br_ip6_multicast_query_expired(struct timer_list *t) 3827 { 3828 struct net_bridge_mcast *brmctx = from_timer(brmctx, t, 3829 ip6_own_query.timer); 3830 3831 br_multicast_query_expired(brmctx, &brmctx->ip6_own_query, 3832 &brmctx->ip6_querier); 3833 } 3834 #endif 3835 3836 static void br_multicast_gc_work(struct work_struct *work) 3837 { 3838 struct net_bridge *br = container_of(work, struct net_bridge, 3839 mcast_gc_work); 3840 HLIST_HEAD(deleted_head); 3841 3842 spin_lock_bh(&br->multicast_lock); 3843 hlist_move_list(&br->mcast_gc_list, &deleted_head); 3844 spin_unlock_bh(&br->multicast_lock); 3845 3846 br_multicast_gc(&deleted_head); 3847 } 3848 3849 void br_multicast_ctx_init(struct net_bridge *br, 3850 struct net_bridge_vlan *vlan, 3851 struct net_bridge_mcast *brmctx) 3852 { 3853 brmctx->br = br; 3854 brmctx->vlan = vlan; 3855 brmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 3856 brmctx->multicast_last_member_count = 2; 3857 brmctx->multicast_startup_query_count = 2; 3858 3859 brmctx->multicast_last_member_interval = HZ; 3860 brmctx->multicast_query_response_interval = 10 * HZ; 3861 brmctx->multicast_startup_query_interval = 125 * HZ / 4; 3862 brmctx->multicast_query_interval = 125 * HZ; 3863 brmctx->multicast_querier_interval = 255 * HZ; 3864 brmctx->multicast_membership_interval = 260 * HZ; 3865 3866 brmctx->ip4_other_query.delay_time = 0; 3867 brmctx->ip4_querier.port_ifidx = 0; 3868 seqcount_spinlock_init(&brmctx->ip4_querier.seq, &br->multicast_lock); 3869 brmctx->multicast_igmp_version = 2; 3870 #if IS_ENABLED(CONFIG_IPV6) 3871 brmctx->multicast_mld_version = 1; 3872 brmctx->ip6_other_query.delay_time = 0; 3873 brmctx->ip6_querier.port_ifidx = 0; 3874 seqcount_spinlock_init(&brmctx->ip6_querier.seq, &br->multicast_lock); 3875 #endif 3876 3877 timer_setup(&brmctx->ip4_mc_router_timer, 3878 br_ip4_multicast_local_router_expired, 0); 3879 timer_setup(&brmctx->ip4_other_query.timer, 3880 br_ip4_multicast_querier_expired, 0); 3881 timer_setup(&brmctx->ip4_own_query.timer, 3882 br_ip4_multicast_query_expired, 0); 3883 #if IS_ENABLED(CONFIG_IPV6) 3884 timer_setup(&brmctx->ip6_mc_router_timer, 3885 br_ip6_multicast_local_router_expired, 0); 3886 timer_setup(&brmctx->ip6_other_query.timer, 3887 br_ip6_multicast_querier_expired, 0); 3888 timer_setup(&brmctx->ip6_own_query.timer, 3889 br_ip6_multicast_query_expired, 0); 3890 #endif 3891 } 3892 3893 void br_multicast_ctx_deinit(struct net_bridge_mcast *brmctx) 3894 { 3895 __br_multicast_stop(brmctx); 3896 } 3897 3898 void br_multicast_init(struct net_bridge *br) 3899 { 3900 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX; 3901 3902 br_multicast_ctx_init(br, NULL, &br->multicast_ctx); 3903 3904 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true); 3905 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true); 3906 3907 spin_lock_init(&br->multicast_lock); 3908 INIT_HLIST_HEAD(&br->mdb_list); 3909 INIT_HLIST_HEAD(&br->mcast_gc_list); 3910 INIT_WORK(&br->mcast_gc_work, br_multicast_gc_work); 3911 } 3912 3913 static void br_ip4_multicast_join_snoopers(struct net_bridge *br) 3914 { 3915 struct in_device *in_dev = in_dev_get(br->dev); 3916 3917 if (!in_dev) 3918 return; 3919 3920 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 3921 in_dev_put(in_dev); 3922 } 3923 3924 #if IS_ENABLED(CONFIG_IPV6) 3925 static void br_ip6_multicast_join_snoopers(struct net_bridge *br) 3926 { 3927 struct in6_addr addr; 3928 3929 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 3930 ipv6_dev_mc_inc(br->dev, &addr); 3931 } 3932 #else 3933 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br) 3934 { 3935 } 3936 #endif 3937 3938 void br_multicast_join_snoopers(struct net_bridge *br) 3939 { 3940 br_ip4_multicast_join_snoopers(br); 3941 br_ip6_multicast_join_snoopers(br); 3942 } 3943 3944 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br) 3945 { 3946 struct in_device *in_dev = in_dev_get(br->dev); 3947 3948 if (WARN_ON(!in_dev)) 3949 return; 3950 3951 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 3952 in_dev_put(in_dev); 3953 } 3954 3955 #if IS_ENABLED(CONFIG_IPV6) 3956 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 3957 { 3958 struct in6_addr addr; 3959 3960 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 3961 ipv6_dev_mc_dec(br->dev, &addr); 3962 } 3963 #else 3964 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 3965 { 3966 } 3967 #endif 3968 3969 void br_multicast_leave_snoopers(struct net_bridge *br) 3970 { 3971 br_ip4_multicast_leave_snoopers(br); 3972 br_ip6_multicast_leave_snoopers(br); 3973 } 3974 3975 static void __br_multicast_open_query(struct net_bridge *br, 3976 struct bridge_mcast_own_query *query) 3977 { 3978 query->startup_sent = 0; 3979 3980 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 3981 return; 3982 3983 mod_timer(&query->timer, jiffies); 3984 } 3985 3986 static void __br_multicast_open(struct net_bridge_mcast *brmctx) 3987 { 3988 __br_multicast_open_query(brmctx->br, &brmctx->ip4_own_query); 3989 #if IS_ENABLED(CONFIG_IPV6) 3990 __br_multicast_open_query(brmctx->br, &brmctx->ip6_own_query); 3991 #endif 3992 } 3993 3994 void br_multicast_open(struct net_bridge *br) 3995 { 3996 ASSERT_RTNL(); 3997 3998 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { 3999 struct net_bridge_vlan_group *vg; 4000 struct net_bridge_vlan *vlan; 4001 4002 vg = br_vlan_group(br); 4003 if (vg) { 4004 list_for_each_entry(vlan, &vg->vlan_list, vlist) { 4005 struct net_bridge_mcast *brmctx; 4006 4007 brmctx = &vlan->br_mcast_ctx; 4008 if (br_vlan_is_brentry(vlan) && 4009 !br_multicast_ctx_vlan_disabled(brmctx)) 4010 __br_multicast_open(&vlan->br_mcast_ctx); 4011 } 4012 } 4013 } else { 4014 __br_multicast_open(&br->multicast_ctx); 4015 } 4016 } 4017 4018 static void __br_multicast_stop(struct net_bridge_mcast *brmctx) 4019 { 4020 del_timer_sync(&brmctx->ip4_mc_router_timer); 4021 del_timer_sync(&brmctx->ip4_other_query.timer); 4022 del_timer_sync(&brmctx->ip4_own_query.timer); 4023 #if IS_ENABLED(CONFIG_IPV6) 4024 del_timer_sync(&brmctx->ip6_mc_router_timer); 4025 del_timer_sync(&brmctx->ip6_other_query.timer); 4026 del_timer_sync(&brmctx->ip6_own_query.timer); 4027 #endif 4028 } 4029 4030 void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on) 4031 { 4032 struct net_bridge *br; 4033 4034 /* it's okay to check for the flag without the multicast lock because it 4035 * can only change under RTNL -> multicast_lock, we need the latter to 4036 * sync with timers and packets 4037 */ 4038 if (on == !!(vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) 4039 return; 4040 4041 if (br_vlan_is_master(vlan)) { 4042 br = vlan->br; 4043 4044 if (!br_vlan_is_brentry(vlan) || 4045 (on && 4046 br_multicast_ctx_vlan_global_disabled(&vlan->br_mcast_ctx))) 4047 return; 4048 4049 spin_lock_bh(&br->multicast_lock); 4050 vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED; 4051 spin_unlock_bh(&br->multicast_lock); 4052 4053 if (on) 4054 __br_multicast_open(&vlan->br_mcast_ctx); 4055 else 4056 __br_multicast_stop(&vlan->br_mcast_ctx); 4057 } else { 4058 struct net_bridge_mcast *brmctx; 4059 4060 brmctx = br_multicast_port_ctx_get_global(&vlan->port_mcast_ctx); 4061 if (on && br_multicast_ctx_vlan_global_disabled(brmctx)) 4062 return; 4063 4064 br = vlan->port->br; 4065 spin_lock_bh(&br->multicast_lock); 4066 vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED; 4067 if (on) 4068 __br_multicast_enable_port_ctx(&vlan->port_mcast_ctx); 4069 else 4070 __br_multicast_disable_port_ctx(&vlan->port_mcast_ctx); 4071 spin_unlock_bh(&br->multicast_lock); 4072 } 4073 } 4074 4075 static void br_multicast_toggle_vlan(struct net_bridge_vlan *vlan, bool on) 4076 { 4077 struct net_bridge_port *p; 4078 4079 if (WARN_ON_ONCE(!br_vlan_is_master(vlan))) 4080 return; 4081 4082 list_for_each_entry(p, &vlan->br->port_list, list) { 4083 struct net_bridge_vlan *vport; 4084 4085 vport = br_vlan_find(nbp_vlan_group(p), vlan->vid); 4086 if (!vport) 4087 continue; 4088 br_multicast_toggle_one_vlan(vport, on); 4089 } 4090 4091 if (br_vlan_is_brentry(vlan)) 4092 br_multicast_toggle_one_vlan(vlan, on); 4093 } 4094 4095 int br_multicast_toggle_vlan_snooping(struct net_bridge *br, bool on, 4096 struct netlink_ext_ack *extack) 4097 { 4098 struct net_bridge_vlan_group *vg; 4099 struct net_bridge_vlan *vlan; 4100 struct net_bridge_port *p; 4101 4102 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) == on) 4103 return 0; 4104 4105 if (on && !br_opt_get(br, BROPT_VLAN_ENABLED)) { 4106 NL_SET_ERR_MSG_MOD(extack, "Cannot enable multicast vlan snooping with vlan filtering disabled"); 4107 return -EINVAL; 4108 } 4109 4110 vg = br_vlan_group(br); 4111 if (!vg) 4112 return 0; 4113 4114 br_opt_toggle(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED, on); 4115 4116 /* disable/enable non-vlan mcast contexts based on vlan snooping */ 4117 if (on) 4118 __br_multicast_stop(&br->multicast_ctx); 4119 else 4120 __br_multicast_open(&br->multicast_ctx); 4121 list_for_each_entry(p, &br->port_list, list) { 4122 if (on) 4123 br_multicast_disable_port(p); 4124 else 4125 br_multicast_enable_port(p); 4126 } 4127 4128 list_for_each_entry(vlan, &vg->vlan_list, vlist) 4129 br_multicast_toggle_vlan(vlan, on); 4130 4131 return 0; 4132 } 4133 4134 bool br_multicast_toggle_global_vlan(struct net_bridge_vlan *vlan, bool on) 4135 { 4136 ASSERT_RTNL(); 4137 4138 /* BR_VLFLAG_GLOBAL_MCAST_ENABLED relies on eventual consistency and 4139 * requires only RTNL to change 4140 */ 4141 if (on == !!(vlan->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED)) 4142 return false; 4143 4144 vlan->priv_flags ^= BR_VLFLAG_GLOBAL_MCAST_ENABLED; 4145 br_multicast_toggle_vlan(vlan, on); 4146 4147 return true; 4148 } 4149 4150 void br_multicast_stop(struct net_bridge *br) 4151 { 4152 ASSERT_RTNL(); 4153 4154 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { 4155 struct net_bridge_vlan_group *vg; 4156 struct net_bridge_vlan *vlan; 4157 4158 vg = br_vlan_group(br); 4159 if (vg) { 4160 list_for_each_entry(vlan, &vg->vlan_list, vlist) { 4161 struct net_bridge_mcast *brmctx; 4162 4163 brmctx = &vlan->br_mcast_ctx; 4164 if (br_vlan_is_brentry(vlan) && 4165 !br_multicast_ctx_vlan_disabled(brmctx)) 4166 __br_multicast_stop(&vlan->br_mcast_ctx); 4167 } 4168 } 4169 } else { 4170 __br_multicast_stop(&br->multicast_ctx); 4171 } 4172 } 4173 4174 void br_multicast_dev_del(struct net_bridge *br) 4175 { 4176 struct net_bridge_mdb_entry *mp; 4177 HLIST_HEAD(deleted_head); 4178 struct hlist_node *tmp; 4179 4180 spin_lock_bh(&br->multicast_lock); 4181 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) 4182 br_multicast_del_mdb_entry(mp); 4183 hlist_move_list(&br->mcast_gc_list, &deleted_head); 4184 spin_unlock_bh(&br->multicast_lock); 4185 4186 br_multicast_ctx_deinit(&br->multicast_ctx); 4187 br_multicast_gc(&deleted_head); 4188 cancel_work_sync(&br->mcast_gc_work); 4189 4190 rcu_barrier(); 4191 } 4192 4193 int br_multicast_set_router(struct net_bridge_mcast *brmctx, unsigned long val) 4194 { 4195 int err = -EINVAL; 4196 4197 spin_lock_bh(&brmctx->br->multicast_lock); 4198 4199 switch (val) { 4200 case MDB_RTR_TYPE_DISABLED: 4201 case MDB_RTR_TYPE_PERM: 4202 br_mc_router_state_change(brmctx->br, val == MDB_RTR_TYPE_PERM); 4203 del_timer(&brmctx->ip4_mc_router_timer); 4204 #if IS_ENABLED(CONFIG_IPV6) 4205 del_timer(&brmctx->ip6_mc_router_timer); 4206 #endif 4207 brmctx->multicast_router = val; 4208 err = 0; 4209 break; 4210 case MDB_RTR_TYPE_TEMP_QUERY: 4211 if (brmctx->multicast_router != MDB_RTR_TYPE_TEMP_QUERY) 4212 br_mc_router_state_change(brmctx->br, false); 4213 brmctx->multicast_router = val; 4214 err = 0; 4215 break; 4216 } 4217 4218 spin_unlock_bh(&brmctx->br->multicast_lock); 4219 4220 return err; 4221 } 4222 4223 static void 4224 br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted) 4225 { 4226 if (!deleted) 4227 return; 4228 4229 /* For backwards compatibility for now, only notify if there is 4230 * no multicast router anymore for both IPv4 and IPv6. 4231 */ 4232 if (!hlist_unhashed(&pmctx->ip4_rlist)) 4233 return; 4234 #if IS_ENABLED(CONFIG_IPV6) 4235 if (!hlist_unhashed(&pmctx->ip6_rlist)) 4236 return; 4237 #endif 4238 4239 br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_DELMDB); 4240 br_port_mc_router_state_change(pmctx->port, false); 4241 4242 /* don't allow timer refresh */ 4243 if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP) 4244 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 4245 } 4246 4247 int br_multicast_set_port_router(struct net_bridge_mcast_port *pmctx, 4248 unsigned long val) 4249 { 4250 struct net_bridge_mcast *brmctx; 4251 unsigned long now = jiffies; 4252 int err = -EINVAL; 4253 bool del = false; 4254 4255 brmctx = br_multicast_port_ctx_get_global(pmctx); 4256 spin_lock_bh(&brmctx->br->multicast_lock); 4257 if (pmctx->multicast_router == val) { 4258 /* Refresh the temp router port timer */ 4259 if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP) { 4260 mod_timer(&pmctx->ip4_mc_router_timer, 4261 now + brmctx->multicast_querier_interval); 4262 #if IS_ENABLED(CONFIG_IPV6) 4263 mod_timer(&pmctx->ip6_mc_router_timer, 4264 now + brmctx->multicast_querier_interval); 4265 #endif 4266 } 4267 err = 0; 4268 goto unlock; 4269 } 4270 switch (val) { 4271 case MDB_RTR_TYPE_DISABLED: 4272 pmctx->multicast_router = MDB_RTR_TYPE_DISABLED; 4273 del |= br_ip4_multicast_rport_del(pmctx); 4274 del_timer(&pmctx->ip4_mc_router_timer); 4275 del |= br_ip6_multicast_rport_del(pmctx); 4276 #if IS_ENABLED(CONFIG_IPV6) 4277 del_timer(&pmctx->ip6_mc_router_timer); 4278 #endif 4279 br_multicast_rport_del_notify(pmctx, del); 4280 break; 4281 case MDB_RTR_TYPE_TEMP_QUERY: 4282 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 4283 del |= br_ip4_multicast_rport_del(pmctx); 4284 del |= br_ip6_multicast_rport_del(pmctx); 4285 br_multicast_rport_del_notify(pmctx, del); 4286 break; 4287 case MDB_RTR_TYPE_PERM: 4288 pmctx->multicast_router = MDB_RTR_TYPE_PERM; 4289 del_timer(&pmctx->ip4_mc_router_timer); 4290 br_ip4_multicast_add_router(brmctx, pmctx); 4291 #if IS_ENABLED(CONFIG_IPV6) 4292 del_timer(&pmctx->ip6_mc_router_timer); 4293 #endif 4294 br_ip6_multicast_add_router(brmctx, pmctx); 4295 break; 4296 case MDB_RTR_TYPE_TEMP: 4297 pmctx->multicast_router = MDB_RTR_TYPE_TEMP; 4298 br_ip4_multicast_mark_router(brmctx, pmctx); 4299 br_ip6_multicast_mark_router(brmctx, pmctx); 4300 break; 4301 default: 4302 goto unlock; 4303 } 4304 err = 0; 4305 unlock: 4306 spin_unlock_bh(&brmctx->br->multicast_lock); 4307 4308 return err; 4309 } 4310 4311 int br_multicast_set_vlan_router(struct net_bridge_vlan *v, u8 mcast_router) 4312 { 4313 int err; 4314 4315 if (br_vlan_is_master(v)) 4316 err = br_multicast_set_router(&v->br_mcast_ctx, mcast_router); 4317 else 4318 err = br_multicast_set_port_router(&v->port_mcast_ctx, 4319 mcast_router); 4320 4321 return err; 4322 } 4323 4324 static void br_multicast_start_querier(struct net_bridge_mcast *brmctx, 4325 struct bridge_mcast_own_query *query) 4326 { 4327 struct net_bridge_port *port; 4328 4329 if (!br_multicast_ctx_matches_vlan_snooping(brmctx)) 4330 return; 4331 4332 __br_multicast_open_query(brmctx->br, query); 4333 4334 rcu_read_lock(); 4335 list_for_each_entry_rcu(port, &brmctx->br->port_list, list) { 4336 struct bridge_mcast_own_query *ip4_own_query; 4337 #if IS_ENABLED(CONFIG_IPV6) 4338 struct bridge_mcast_own_query *ip6_own_query; 4339 #endif 4340 4341 if (br_multicast_port_ctx_state_stopped(&port->multicast_ctx)) 4342 continue; 4343 4344 if (br_multicast_ctx_is_vlan(brmctx)) { 4345 struct net_bridge_vlan *vlan; 4346 4347 vlan = br_vlan_find(nbp_vlan_group_rcu(port), 4348 brmctx->vlan->vid); 4349 if (!vlan || 4350 br_multicast_port_ctx_state_stopped(&vlan->port_mcast_ctx)) 4351 continue; 4352 4353 ip4_own_query = &vlan->port_mcast_ctx.ip4_own_query; 4354 #if IS_ENABLED(CONFIG_IPV6) 4355 ip6_own_query = &vlan->port_mcast_ctx.ip6_own_query; 4356 #endif 4357 } else { 4358 ip4_own_query = &port->multicast_ctx.ip4_own_query; 4359 #if IS_ENABLED(CONFIG_IPV6) 4360 ip6_own_query = &port->multicast_ctx.ip6_own_query; 4361 #endif 4362 } 4363 4364 if (query == &brmctx->ip4_own_query) 4365 br_multicast_enable(ip4_own_query); 4366 #if IS_ENABLED(CONFIG_IPV6) 4367 else 4368 br_multicast_enable(ip6_own_query); 4369 #endif 4370 } 4371 rcu_read_unlock(); 4372 } 4373 4374 int br_multicast_toggle(struct net_bridge *br, unsigned long val, 4375 struct netlink_ext_ack *extack) 4376 { 4377 struct net_bridge_port *port; 4378 bool change_snoopers = false; 4379 int err = 0; 4380 4381 spin_lock_bh(&br->multicast_lock); 4382 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val) 4383 goto unlock; 4384 4385 err = br_mc_disabled_update(br->dev, val, extack); 4386 if (err == -EOPNOTSUPP) 4387 err = 0; 4388 if (err) 4389 goto unlock; 4390 4391 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val); 4392 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) { 4393 change_snoopers = true; 4394 goto unlock; 4395 } 4396 4397 if (!netif_running(br->dev)) 4398 goto unlock; 4399 4400 br_multicast_open(br); 4401 list_for_each_entry(port, &br->port_list, list) 4402 __br_multicast_enable_port_ctx(&port->multicast_ctx); 4403 4404 change_snoopers = true; 4405 4406 unlock: 4407 spin_unlock_bh(&br->multicast_lock); 4408 4409 /* br_multicast_join_snoopers has the potential to cause 4410 * an MLD Report/Leave to be delivered to br_multicast_rcv, 4411 * which would in turn call br_multicast_add_group, which would 4412 * attempt to acquire multicast_lock. This function should be 4413 * called after the lock has been released to avoid deadlocks on 4414 * multicast_lock. 4415 * 4416 * br_multicast_leave_snoopers does not have the problem since 4417 * br_multicast_rcv first checks BROPT_MULTICAST_ENABLED, and 4418 * returns without calling br_multicast_ipv4/6_rcv if it's not 4419 * enabled. Moved both functions out just for symmetry. 4420 */ 4421 if (change_snoopers) { 4422 if (br_opt_get(br, BROPT_MULTICAST_ENABLED)) 4423 br_multicast_join_snoopers(br); 4424 else 4425 br_multicast_leave_snoopers(br); 4426 } 4427 4428 return err; 4429 } 4430 4431 bool br_multicast_enabled(const struct net_device *dev) 4432 { 4433 struct net_bridge *br = netdev_priv(dev); 4434 4435 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED); 4436 } 4437 EXPORT_SYMBOL_GPL(br_multicast_enabled); 4438 4439 bool br_multicast_router(const struct net_device *dev) 4440 { 4441 struct net_bridge *br = netdev_priv(dev); 4442 bool is_router; 4443 4444 spin_lock_bh(&br->multicast_lock); 4445 is_router = br_multicast_is_router(&br->multicast_ctx, NULL); 4446 spin_unlock_bh(&br->multicast_lock); 4447 return is_router; 4448 } 4449 EXPORT_SYMBOL_GPL(br_multicast_router); 4450 4451 int br_multicast_set_querier(struct net_bridge_mcast *brmctx, unsigned long val) 4452 { 4453 unsigned long max_delay; 4454 4455 val = !!val; 4456 4457 spin_lock_bh(&brmctx->br->multicast_lock); 4458 if (brmctx->multicast_querier == val) 4459 goto unlock; 4460 4461 WRITE_ONCE(brmctx->multicast_querier, val); 4462 if (!val) 4463 goto unlock; 4464 4465 max_delay = brmctx->multicast_query_response_interval; 4466 4467 if (!timer_pending(&brmctx->ip4_other_query.timer)) 4468 brmctx->ip4_other_query.delay_time = jiffies + max_delay; 4469 4470 br_multicast_start_querier(brmctx, &brmctx->ip4_own_query); 4471 4472 #if IS_ENABLED(CONFIG_IPV6) 4473 if (!timer_pending(&brmctx->ip6_other_query.timer)) 4474 brmctx->ip6_other_query.delay_time = jiffies + max_delay; 4475 4476 br_multicast_start_querier(brmctx, &brmctx->ip6_own_query); 4477 #endif 4478 4479 unlock: 4480 spin_unlock_bh(&brmctx->br->multicast_lock); 4481 4482 return 0; 4483 } 4484 4485 int br_multicast_set_igmp_version(struct net_bridge_mcast *brmctx, 4486 unsigned long val) 4487 { 4488 /* Currently we support only version 2 and 3 */ 4489 switch (val) { 4490 case 2: 4491 case 3: 4492 break; 4493 default: 4494 return -EINVAL; 4495 } 4496 4497 spin_lock_bh(&brmctx->br->multicast_lock); 4498 brmctx->multicast_igmp_version = val; 4499 spin_unlock_bh(&brmctx->br->multicast_lock); 4500 4501 return 0; 4502 } 4503 4504 #if IS_ENABLED(CONFIG_IPV6) 4505 int br_multicast_set_mld_version(struct net_bridge_mcast *brmctx, 4506 unsigned long val) 4507 { 4508 /* Currently we support version 1 and 2 */ 4509 switch (val) { 4510 case 1: 4511 case 2: 4512 break; 4513 default: 4514 return -EINVAL; 4515 } 4516 4517 spin_lock_bh(&brmctx->br->multicast_lock); 4518 brmctx->multicast_mld_version = val; 4519 spin_unlock_bh(&brmctx->br->multicast_lock); 4520 4521 return 0; 4522 } 4523 #endif 4524 4525 void br_multicast_set_query_intvl(struct net_bridge_mcast *brmctx, 4526 unsigned long val) 4527 { 4528 unsigned long intvl_jiffies = clock_t_to_jiffies(val); 4529 4530 if (intvl_jiffies < BR_MULTICAST_QUERY_INTVL_MIN) { 4531 br_info(brmctx->br, 4532 "trying to set multicast query interval below minimum, setting to %lu (%ums)\n", 4533 jiffies_to_clock_t(BR_MULTICAST_QUERY_INTVL_MIN), 4534 jiffies_to_msecs(BR_MULTICAST_QUERY_INTVL_MIN)); 4535 intvl_jiffies = BR_MULTICAST_QUERY_INTVL_MIN; 4536 } 4537 4538 brmctx->multicast_query_interval = intvl_jiffies; 4539 } 4540 4541 void br_multicast_set_startup_query_intvl(struct net_bridge_mcast *brmctx, 4542 unsigned long val) 4543 { 4544 unsigned long intvl_jiffies = clock_t_to_jiffies(val); 4545 4546 if (intvl_jiffies < BR_MULTICAST_STARTUP_QUERY_INTVL_MIN) { 4547 br_info(brmctx->br, 4548 "trying to set multicast startup query interval below minimum, setting to %lu (%ums)\n", 4549 jiffies_to_clock_t(BR_MULTICAST_STARTUP_QUERY_INTVL_MIN), 4550 jiffies_to_msecs(BR_MULTICAST_STARTUP_QUERY_INTVL_MIN)); 4551 intvl_jiffies = BR_MULTICAST_STARTUP_QUERY_INTVL_MIN; 4552 } 4553 4554 brmctx->multicast_startup_query_interval = intvl_jiffies; 4555 } 4556 4557 /** 4558 * br_multicast_list_adjacent - Returns snooped multicast addresses 4559 * @dev: The bridge port adjacent to which to retrieve addresses 4560 * @br_ip_list: The list to store found, snooped multicast IP addresses in 4561 * 4562 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast 4563 * snooping feature on all bridge ports of dev's bridge device, excluding 4564 * the addresses from dev itself. 4565 * 4566 * Returns the number of items added to br_ip_list. 4567 * 4568 * Notes: 4569 * - br_ip_list needs to be initialized by caller 4570 * - br_ip_list might contain duplicates in the end 4571 * (needs to be taken care of by caller) 4572 * - br_ip_list needs to be freed by caller 4573 */ 4574 int br_multicast_list_adjacent(struct net_device *dev, 4575 struct list_head *br_ip_list) 4576 { 4577 struct net_bridge *br; 4578 struct net_bridge_port *port; 4579 struct net_bridge_port_group *group; 4580 struct br_ip_list *entry; 4581 int count = 0; 4582 4583 rcu_read_lock(); 4584 if (!br_ip_list || !netif_is_bridge_port(dev)) 4585 goto unlock; 4586 4587 port = br_port_get_rcu(dev); 4588 if (!port || !port->br) 4589 goto unlock; 4590 4591 br = port->br; 4592 4593 list_for_each_entry_rcu(port, &br->port_list, list) { 4594 if (!port->dev || port->dev == dev) 4595 continue; 4596 4597 hlist_for_each_entry_rcu(group, &port->mglist, mglist) { 4598 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 4599 if (!entry) 4600 goto unlock; 4601 4602 entry->addr = group->key.addr; 4603 list_add(&entry->list, br_ip_list); 4604 count++; 4605 } 4606 } 4607 4608 unlock: 4609 rcu_read_unlock(); 4610 return count; 4611 } 4612 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); 4613 4614 /** 4615 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge 4616 * @dev: The bridge port providing the bridge on which to check for a querier 4617 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 4618 * 4619 * Checks whether the given interface has a bridge on top and if so returns 4620 * true if a valid querier exists anywhere on the bridged link layer. 4621 * Otherwise returns false. 4622 */ 4623 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto) 4624 { 4625 struct net_bridge *br; 4626 struct net_bridge_port *port; 4627 struct ethhdr eth; 4628 bool ret = false; 4629 4630 rcu_read_lock(); 4631 if (!netif_is_bridge_port(dev)) 4632 goto unlock; 4633 4634 port = br_port_get_rcu(dev); 4635 if (!port || !port->br) 4636 goto unlock; 4637 4638 br = port->br; 4639 4640 memset(ð, 0, sizeof(eth)); 4641 eth.h_proto = htons(proto); 4642 4643 ret = br_multicast_querier_exists(&br->multicast_ctx, ð, NULL); 4644 4645 unlock: 4646 rcu_read_unlock(); 4647 return ret; 4648 } 4649 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere); 4650 4651 /** 4652 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port 4653 * @dev: The bridge port adjacent to which to check for a querier 4654 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 4655 * 4656 * Checks whether the given interface has a bridge on top and if so returns 4657 * true if a selected querier is behind one of the other ports of this 4658 * bridge. Otherwise returns false. 4659 */ 4660 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) 4661 { 4662 struct net_bridge_mcast *brmctx; 4663 struct net_bridge *br; 4664 struct net_bridge_port *port; 4665 bool ret = false; 4666 int port_ifidx; 4667 4668 rcu_read_lock(); 4669 if (!netif_is_bridge_port(dev)) 4670 goto unlock; 4671 4672 port = br_port_get_rcu(dev); 4673 if (!port || !port->br) 4674 goto unlock; 4675 4676 br = port->br; 4677 brmctx = &br->multicast_ctx; 4678 4679 switch (proto) { 4680 case ETH_P_IP: 4681 port_ifidx = brmctx->ip4_querier.port_ifidx; 4682 if (!timer_pending(&brmctx->ip4_other_query.timer) || 4683 port_ifidx == port->dev->ifindex) 4684 goto unlock; 4685 break; 4686 #if IS_ENABLED(CONFIG_IPV6) 4687 case ETH_P_IPV6: 4688 port_ifidx = brmctx->ip6_querier.port_ifidx; 4689 if (!timer_pending(&brmctx->ip6_other_query.timer) || 4690 port_ifidx == port->dev->ifindex) 4691 goto unlock; 4692 break; 4693 #endif 4694 default: 4695 goto unlock; 4696 } 4697 4698 ret = true; 4699 unlock: 4700 rcu_read_unlock(); 4701 return ret; 4702 } 4703 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); 4704 4705 /** 4706 * br_multicast_has_router_adjacent - Checks for a router behind a bridge port 4707 * @dev: The bridge port adjacent to which to check for a multicast router 4708 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 4709 * 4710 * Checks whether the given interface has a bridge on top and if so returns 4711 * true if a multicast router is behind one of the other ports of this 4712 * bridge. Otherwise returns false. 4713 */ 4714 bool br_multicast_has_router_adjacent(struct net_device *dev, int proto) 4715 { 4716 struct net_bridge_mcast_port *pmctx; 4717 struct net_bridge_mcast *brmctx; 4718 struct net_bridge_port *port; 4719 bool ret = false; 4720 4721 rcu_read_lock(); 4722 port = br_port_get_check_rcu(dev); 4723 if (!port) 4724 goto unlock; 4725 4726 brmctx = &port->br->multicast_ctx; 4727 switch (proto) { 4728 case ETH_P_IP: 4729 hlist_for_each_entry_rcu(pmctx, &brmctx->ip4_mc_router_list, 4730 ip4_rlist) { 4731 if (pmctx->port == port) 4732 continue; 4733 4734 ret = true; 4735 goto unlock; 4736 } 4737 break; 4738 #if IS_ENABLED(CONFIG_IPV6) 4739 case ETH_P_IPV6: 4740 hlist_for_each_entry_rcu(pmctx, &brmctx->ip6_mc_router_list, 4741 ip6_rlist) { 4742 if (pmctx->port == port) 4743 continue; 4744 4745 ret = true; 4746 goto unlock; 4747 } 4748 break; 4749 #endif 4750 default: 4751 /* when compiled without IPv6 support, be conservative and 4752 * always assume presence of an IPv6 multicast router 4753 */ 4754 ret = true; 4755 } 4756 4757 unlock: 4758 rcu_read_unlock(); 4759 return ret; 4760 } 4761 EXPORT_SYMBOL_GPL(br_multicast_has_router_adjacent); 4762 4763 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats, 4764 const struct sk_buff *skb, u8 type, u8 dir) 4765 { 4766 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats); 4767 __be16 proto = skb->protocol; 4768 unsigned int t_len; 4769 4770 u64_stats_update_begin(&pstats->syncp); 4771 switch (proto) { 4772 case htons(ETH_P_IP): 4773 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); 4774 switch (type) { 4775 case IGMP_HOST_MEMBERSHIP_REPORT: 4776 pstats->mstats.igmp_v1reports[dir]++; 4777 break; 4778 case IGMPV2_HOST_MEMBERSHIP_REPORT: 4779 pstats->mstats.igmp_v2reports[dir]++; 4780 break; 4781 case IGMPV3_HOST_MEMBERSHIP_REPORT: 4782 pstats->mstats.igmp_v3reports[dir]++; 4783 break; 4784 case IGMP_HOST_MEMBERSHIP_QUERY: 4785 if (t_len != sizeof(struct igmphdr)) { 4786 pstats->mstats.igmp_v3queries[dir]++; 4787 } else { 4788 unsigned int offset = skb_transport_offset(skb); 4789 struct igmphdr *ih, _ihdr; 4790 4791 ih = skb_header_pointer(skb, offset, 4792 sizeof(_ihdr), &_ihdr); 4793 if (!ih) 4794 break; 4795 if (!ih->code) 4796 pstats->mstats.igmp_v1queries[dir]++; 4797 else 4798 pstats->mstats.igmp_v2queries[dir]++; 4799 } 4800 break; 4801 case IGMP_HOST_LEAVE_MESSAGE: 4802 pstats->mstats.igmp_leaves[dir]++; 4803 break; 4804 } 4805 break; 4806 #if IS_ENABLED(CONFIG_IPV6) 4807 case htons(ETH_P_IPV6): 4808 t_len = ntohs(ipv6_hdr(skb)->payload_len) + 4809 sizeof(struct ipv6hdr); 4810 t_len -= skb_network_header_len(skb); 4811 switch (type) { 4812 case ICMPV6_MGM_REPORT: 4813 pstats->mstats.mld_v1reports[dir]++; 4814 break; 4815 case ICMPV6_MLD2_REPORT: 4816 pstats->mstats.mld_v2reports[dir]++; 4817 break; 4818 case ICMPV6_MGM_QUERY: 4819 if (t_len != sizeof(struct mld_msg)) 4820 pstats->mstats.mld_v2queries[dir]++; 4821 else 4822 pstats->mstats.mld_v1queries[dir]++; 4823 break; 4824 case ICMPV6_MGM_REDUCTION: 4825 pstats->mstats.mld_leaves[dir]++; 4826 break; 4827 } 4828 break; 4829 #endif /* CONFIG_IPV6 */ 4830 } 4831 u64_stats_update_end(&pstats->syncp); 4832 } 4833 4834 void br_multicast_count(struct net_bridge *br, 4835 const struct net_bridge_port *p, 4836 const struct sk_buff *skb, u8 type, u8 dir) 4837 { 4838 struct bridge_mcast_stats __percpu *stats; 4839 4840 /* if multicast_disabled is true then igmp type can't be set */ 4841 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 4842 return; 4843 4844 if (p) 4845 stats = p->mcast_stats; 4846 else 4847 stats = br->mcast_stats; 4848 if (WARN_ON(!stats)) 4849 return; 4850 4851 br_mcast_stats_add(stats, skb, type, dir); 4852 } 4853 4854 int br_multicast_init_stats(struct net_bridge *br) 4855 { 4856 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 4857 if (!br->mcast_stats) 4858 return -ENOMEM; 4859 4860 return 0; 4861 } 4862 4863 void br_multicast_uninit_stats(struct net_bridge *br) 4864 { 4865 free_percpu(br->mcast_stats); 4866 } 4867 4868 /* noinline for https://bugs.llvm.org/show_bug.cgi?id=45802#c9 */ 4869 static noinline_for_stack void mcast_stats_add_dir(u64 *dst, u64 *src) 4870 { 4871 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX]; 4872 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX]; 4873 } 4874 4875 void br_multicast_get_stats(const struct net_bridge *br, 4876 const struct net_bridge_port *p, 4877 struct br_mcast_stats *dest) 4878 { 4879 struct bridge_mcast_stats __percpu *stats; 4880 struct br_mcast_stats tdst; 4881 int i; 4882 4883 memset(dest, 0, sizeof(*dest)); 4884 if (p) 4885 stats = p->mcast_stats; 4886 else 4887 stats = br->mcast_stats; 4888 if (WARN_ON(!stats)) 4889 return; 4890 4891 memset(&tdst, 0, sizeof(tdst)); 4892 for_each_possible_cpu(i) { 4893 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i); 4894 struct br_mcast_stats temp; 4895 unsigned int start; 4896 4897 do { 4898 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); 4899 memcpy(&temp, &cpu_stats->mstats, sizeof(temp)); 4900 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); 4901 4902 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries); 4903 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries); 4904 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries); 4905 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves); 4906 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports); 4907 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports); 4908 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports); 4909 tdst.igmp_parse_errors += temp.igmp_parse_errors; 4910 4911 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries); 4912 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries); 4913 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves); 4914 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports); 4915 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports); 4916 tdst.mld_parse_errors += temp.mld_parse_errors; 4917 } 4918 memcpy(dest, &tdst, sizeof(*dest)); 4919 } 4920 4921 int br_mdb_hash_init(struct net_bridge *br) 4922 { 4923 int err; 4924 4925 err = rhashtable_init(&br->sg_port_tbl, &br_sg_port_rht_params); 4926 if (err) 4927 return err; 4928 4929 err = rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params); 4930 if (err) { 4931 rhashtable_destroy(&br->sg_port_tbl); 4932 return err; 4933 } 4934 4935 return 0; 4936 } 4937 4938 void br_mdb_hash_fini(struct net_bridge *br) 4939 { 4940 rhashtable_destroy(&br->sg_port_tbl); 4941 rhashtable_destroy(&br->mdb_hash_tbl); 4942 } 4943