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(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 return; 1633 1634 again_under_lmqt: 1635 skb = br_multicast_alloc_query(brmctx, pmctx, pg, ip_dst, group, 1636 with_srcs, over_lmqt, sflag, &igmp_type, 1637 need_rexmit); 1638 if (!skb) 1639 return; 1640 1641 if (pmctx) { 1642 skb->dev = pmctx->port->dev; 1643 br_multicast_count(brmctx->br, pmctx->port, skb, igmp_type, 1644 BR_MCAST_DIR_TX); 1645 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, 1646 dev_net(pmctx->port->dev), NULL, skb, NULL, skb->dev, 1647 br_dev_queue_push_xmit); 1648 1649 if (over_lmqt && with_srcs && sflag) { 1650 over_lmqt = false; 1651 goto again_under_lmqt; 1652 } 1653 } else { 1654 br_multicast_select_own_querier(brmctx, group, skb); 1655 br_multicast_count(brmctx->br, NULL, skb, igmp_type, 1656 BR_MCAST_DIR_RX); 1657 netif_rx(skb); 1658 } 1659 } 1660 1661 static void br_multicast_send_query(struct net_bridge_mcast *brmctx, 1662 struct net_bridge_mcast_port *pmctx, 1663 struct bridge_mcast_own_query *own_query) 1664 { 1665 struct bridge_mcast_other_query *other_query = NULL; 1666 struct br_ip br_group; 1667 unsigned long time; 1668 1669 if (!br_multicast_ctx_should_use(brmctx, pmctx) || 1670 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) || 1671 !br_opt_get(brmctx->br, BROPT_MULTICAST_QUERIER)) 1672 return; 1673 1674 memset(&br_group.dst, 0, sizeof(br_group.dst)); 1675 1676 if (pmctx ? (own_query == &pmctx->ip4_own_query) : 1677 (own_query == &brmctx->ip4_own_query)) { 1678 other_query = &brmctx->ip4_other_query; 1679 br_group.proto = htons(ETH_P_IP); 1680 #if IS_ENABLED(CONFIG_IPV6) 1681 } else { 1682 other_query = &brmctx->ip6_other_query; 1683 br_group.proto = htons(ETH_P_IPV6); 1684 #endif 1685 } 1686 1687 if (!other_query || timer_pending(&other_query->timer)) 1688 return; 1689 1690 __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &br_group, false, 1691 0, NULL); 1692 1693 time = jiffies; 1694 time += own_query->startup_sent < brmctx->multicast_startup_query_count ? 1695 brmctx->multicast_startup_query_interval : 1696 brmctx->multicast_query_interval; 1697 mod_timer(&own_query->timer, time); 1698 } 1699 1700 static void 1701 br_multicast_port_query_expired(struct net_bridge_mcast_port *pmctx, 1702 struct bridge_mcast_own_query *query) 1703 { 1704 struct net_bridge *br = pmctx->port->br; 1705 struct net_bridge_mcast *brmctx; 1706 1707 spin_lock(&br->multicast_lock); 1708 if (br_multicast_port_ctx_state_stopped(pmctx)) 1709 goto out; 1710 1711 brmctx = br_multicast_port_ctx_get_global(pmctx); 1712 if (query->startup_sent < brmctx->multicast_startup_query_count) 1713 query->startup_sent++; 1714 1715 br_multicast_send_query(brmctx, pmctx, query); 1716 1717 out: 1718 spin_unlock(&br->multicast_lock); 1719 } 1720 1721 static void br_ip4_multicast_port_query_expired(struct timer_list *t) 1722 { 1723 struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t, 1724 ip4_own_query.timer); 1725 1726 br_multicast_port_query_expired(pmctx, &pmctx->ip4_own_query); 1727 } 1728 1729 #if IS_ENABLED(CONFIG_IPV6) 1730 static void br_ip6_multicast_port_query_expired(struct timer_list *t) 1731 { 1732 struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t, 1733 ip6_own_query.timer); 1734 1735 br_multicast_port_query_expired(pmctx, &pmctx->ip6_own_query); 1736 } 1737 #endif 1738 1739 static void br_multicast_port_group_rexmit(struct timer_list *t) 1740 { 1741 struct net_bridge_port_group *pg = from_timer(pg, t, rexmit_timer); 1742 struct bridge_mcast_other_query *other_query = NULL; 1743 struct net_bridge *br = pg->key.port->br; 1744 struct net_bridge_mcast_port *pmctx; 1745 struct net_bridge_mcast *brmctx; 1746 bool need_rexmit = false; 1747 1748 spin_lock(&br->multicast_lock); 1749 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) || 1750 !br_opt_get(br, BROPT_MULTICAST_ENABLED) || 1751 !br_opt_get(br, BROPT_MULTICAST_QUERIER)) 1752 goto out; 1753 1754 pmctx = br_multicast_pg_to_port_ctx(pg); 1755 if (!pmctx) 1756 goto out; 1757 brmctx = br_multicast_port_ctx_get_global(pmctx); 1758 if (pg->key.addr.proto == htons(ETH_P_IP)) 1759 other_query = &brmctx->ip4_other_query; 1760 #if IS_ENABLED(CONFIG_IPV6) 1761 else 1762 other_query = &brmctx->ip6_other_query; 1763 #endif 1764 1765 if (!other_query || timer_pending(&other_query->timer)) 1766 goto out; 1767 1768 if (pg->grp_query_rexmit_cnt) { 1769 pg->grp_query_rexmit_cnt--; 1770 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 1771 &pg->key.addr, false, 1, NULL); 1772 } 1773 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 1774 &pg->key.addr, true, 0, &need_rexmit); 1775 1776 if (pg->grp_query_rexmit_cnt || need_rexmit) 1777 mod_timer(&pg->rexmit_timer, jiffies + 1778 brmctx->multicast_last_member_interval); 1779 out: 1780 spin_unlock(&br->multicast_lock); 1781 } 1782 1783 static int br_mc_disabled_update(struct net_device *dev, bool value, 1784 struct netlink_ext_ack *extack) 1785 { 1786 struct switchdev_attr attr = { 1787 .orig_dev = dev, 1788 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED, 1789 .flags = SWITCHDEV_F_DEFER, 1790 .u.mc_disabled = !value, 1791 }; 1792 1793 return switchdev_port_attr_set(dev, &attr, extack); 1794 } 1795 1796 void br_multicast_port_ctx_init(struct net_bridge_port *port, 1797 struct net_bridge_vlan *vlan, 1798 struct net_bridge_mcast_port *pmctx) 1799 { 1800 pmctx->port = port; 1801 pmctx->vlan = vlan; 1802 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1803 timer_setup(&pmctx->ip4_mc_router_timer, 1804 br_ip4_multicast_router_expired, 0); 1805 timer_setup(&pmctx->ip4_own_query.timer, 1806 br_ip4_multicast_port_query_expired, 0); 1807 #if IS_ENABLED(CONFIG_IPV6) 1808 timer_setup(&pmctx->ip6_mc_router_timer, 1809 br_ip6_multicast_router_expired, 0); 1810 timer_setup(&pmctx->ip6_own_query.timer, 1811 br_ip6_multicast_port_query_expired, 0); 1812 #endif 1813 } 1814 1815 void br_multicast_port_ctx_deinit(struct net_bridge_mcast_port *pmctx) 1816 { 1817 #if IS_ENABLED(CONFIG_IPV6) 1818 del_timer_sync(&pmctx->ip6_mc_router_timer); 1819 #endif 1820 del_timer_sync(&pmctx->ip4_mc_router_timer); 1821 } 1822 1823 int br_multicast_add_port(struct net_bridge_port *port) 1824 { 1825 int err; 1826 1827 port->multicast_eht_hosts_limit = BR_MCAST_DEFAULT_EHT_HOSTS_LIMIT; 1828 br_multicast_port_ctx_init(port, NULL, &port->multicast_ctx); 1829 1830 err = br_mc_disabled_update(port->dev, 1831 br_opt_get(port->br, 1832 BROPT_MULTICAST_ENABLED), 1833 NULL); 1834 if (err && err != -EOPNOTSUPP) 1835 return err; 1836 1837 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 1838 if (!port->mcast_stats) 1839 return -ENOMEM; 1840 1841 return 0; 1842 } 1843 1844 void br_multicast_del_port(struct net_bridge_port *port) 1845 { 1846 struct net_bridge *br = port->br; 1847 struct net_bridge_port_group *pg; 1848 HLIST_HEAD(deleted_head); 1849 struct hlist_node *n; 1850 1851 /* Take care of the remaining groups, only perm ones should be left */ 1852 spin_lock_bh(&br->multicast_lock); 1853 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 1854 br_multicast_find_del_pg(br, pg); 1855 hlist_move_list(&br->mcast_gc_list, &deleted_head); 1856 spin_unlock_bh(&br->multicast_lock); 1857 br_multicast_gc(&deleted_head); 1858 br_multicast_port_ctx_deinit(&port->multicast_ctx); 1859 free_percpu(port->mcast_stats); 1860 } 1861 1862 static void br_multicast_enable(struct bridge_mcast_own_query *query) 1863 { 1864 query->startup_sent = 0; 1865 1866 if (try_to_del_timer_sync(&query->timer) >= 0 || 1867 del_timer(&query->timer)) 1868 mod_timer(&query->timer, jiffies); 1869 } 1870 1871 static void __br_multicast_enable_port_ctx(struct net_bridge_mcast_port *pmctx) 1872 { 1873 struct net_bridge *br = pmctx->port->br; 1874 struct net_bridge_mcast *brmctx; 1875 1876 brmctx = br_multicast_port_ctx_get_global(pmctx); 1877 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || 1878 !netif_running(br->dev)) 1879 return; 1880 1881 br_multicast_enable(&pmctx->ip4_own_query); 1882 #if IS_ENABLED(CONFIG_IPV6) 1883 br_multicast_enable(&pmctx->ip6_own_query); 1884 #endif 1885 if (pmctx->multicast_router == MDB_RTR_TYPE_PERM) { 1886 br_ip4_multicast_add_router(brmctx, pmctx); 1887 br_ip6_multicast_add_router(brmctx, pmctx); 1888 } 1889 } 1890 1891 void br_multicast_enable_port(struct net_bridge_port *port) 1892 { 1893 struct net_bridge *br = port->br; 1894 1895 spin_lock_bh(&br->multicast_lock); 1896 __br_multicast_enable_port_ctx(&port->multicast_ctx); 1897 spin_unlock_bh(&br->multicast_lock); 1898 } 1899 1900 static void __br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx) 1901 { 1902 struct net_bridge_port_group *pg; 1903 struct hlist_node *n; 1904 bool del = false; 1905 1906 hlist_for_each_entry_safe(pg, n, &pmctx->port->mglist, mglist) 1907 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT) && 1908 (!br_multicast_port_ctx_is_vlan(pmctx) || 1909 pg->key.addr.vid == pmctx->vlan->vid)) 1910 br_multicast_find_del_pg(pmctx->port->br, pg); 1911 1912 del |= br_ip4_multicast_rport_del(pmctx); 1913 del_timer(&pmctx->ip4_mc_router_timer); 1914 del_timer(&pmctx->ip4_own_query.timer); 1915 del |= br_ip6_multicast_rport_del(pmctx); 1916 #if IS_ENABLED(CONFIG_IPV6) 1917 del_timer(&pmctx->ip6_mc_router_timer); 1918 del_timer(&pmctx->ip6_own_query.timer); 1919 #endif 1920 br_multicast_rport_del_notify(pmctx, del); 1921 } 1922 1923 void br_multicast_disable_port(struct net_bridge_port *port) 1924 { 1925 spin_lock_bh(&port->br->multicast_lock); 1926 __br_multicast_disable_port_ctx(&port->multicast_ctx); 1927 spin_unlock_bh(&port->br->multicast_lock); 1928 } 1929 1930 static int __grp_src_delete_marked(struct net_bridge_port_group *pg) 1931 { 1932 struct net_bridge_group_src *ent; 1933 struct hlist_node *tmp; 1934 int deleted = 0; 1935 1936 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) 1937 if (ent->flags & BR_SGRP_F_DELETE) { 1938 br_multicast_del_group_src(ent, false); 1939 deleted++; 1940 } 1941 1942 return deleted; 1943 } 1944 1945 static void __grp_src_mod_timer(struct net_bridge_group_src *src, 1946 unsigned long expires) 1947 { 1948 mod_timer(&src->timer, expires); 1949 br_multicast_fwd_src_handle(src); 1950 } 1951 1952 static void __grp_src_query_marked_and_rexmit(struct net_bridge_mcast *brmctx, 1953 struct net_bridge_mcast_port *pmctx, 1954 struct net_bridge_port_group *pg) 1955 { 1956 struct bridge_mcast_other_query *other_query = NULL; 1957 u32 lmqc = brmctx->multicast_last_member_count; 1958 unsigned long lmqt, lmi, now = jiffies; 1959 struct net_bridge_group_src *ent; 1960 1961 if (!netif_running(brmctx->br->dev) || 1962 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) 1963 return; 1964 1965 if (pg->key.addr.proto == htons(ETH_P_IP)) 1966 other_query = &brmctx->ip4_other_query; 1967 #if IS_ENABLED(CONFIG_IPV6) 1968 else 1969 other_query = &brmctx->ip6_other_query; 1970 #endif 1971 1972 lmqt = now + br_multicast_lmqt(brmctx); 1973 hlist_for_each_entry(ent, &pg->src_list, node) { 1974 if (ent->flags & BR_SGRP_F_SEND) { 1975 ent->flags &= ~BR_SGRP_F_SEND; 1976 if (ent->timer.expires > lmqt) { 1977 if (br_opt_get(brmctx->br, 1978 BROPT_MULTICAST_QUERIER) && 1979 other_query && 1980 !timer_pending(&other_query->timer)) 1981 ent->src_query_rexmit_cnt = lmqc; 1982 __grp_src_mod_timer(ent, lmqt); 1983 } 1984 } 1985 } 1986 1987 if (!br_opt_get(brmctx->br, BROPT_MULTICAST_QUERIER) || 1988 !other_query || timer_pending(&other_query->timer)) 1989 return; 1990 1991 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 1992 &pg->key.addr, true, 1, NULL); 1993 1994 lmi = now + brmctx->multicast_last_member_interval; 1995 if (!timer_pending(&pg->rexmit_timer) || 1996 time_after(pg->rexmit_timer.expires, lmi)) 1997 mod_timer(&pg->rexmit_timer, lmi); 1998 } 1999 2000 static void __grp_send_query_and_rexmit(struct net_bridge_mcast *brmctx, 2001 struct net_bridge_mcast_port *pmctx, 2002 struct net_bridge_port_group *pg) 2003 { 2004 struct bridge_mcast_other_query *other_query = NULL; 2005 unsigned long now = jiffies, lmi; 2006 2007 if (!netif_running(brmctx->br->dev) || 2008 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) 2009 return; 2010 2011 if (pg->key.addr.proto == htons(ETH_P_IP)) 2012 other_query = &brmctx->ip4_other_query; 2013 #if IS_ENABLED(CONFIG_IPV6) 2014 else 2015 other_query = &brmctx->ip6_other_query; 2016 #endif 2017 2018 if (br_opt_get(brmctx->br, BROPT_MULTICAST_QUERIER) && 2019 other_query && !timer_pending(&other_query->timer)) { 2020 lmi = now + brmctx->multicast_last_member_interval; 2021 pg->grp_query_rexmit_cnt = brmctx->multicast_last_member_count - 1; 2022 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 2023 &pg->key.addr, false, 0, NULL); 2024 if (!timer_pending(&pg->rexmit_timer) || 2025 time_after(pg->rexmit_timer.expires, lmi)) 2026 mod_timer(&pg->rexmit_timer, lmi); 2027 } 2028 2029 if (pg->filter_mode == MCAST_EXCLUDE && 2030 (!timer_pending(&pg->timer) || 2031 time_after(pg->timer.expires, now + br_multicast_lmqt(brmctx)))) 2032 mod_timer(&pg->timer, now + br_multicast_lmqt(brmctx)); 2033 } 2034 2035 /* State Msg type New state Actions 2036 * INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI 2037 * INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI 2038 * EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI 2039 */ 2040 static bool br_multicast_isinc_allow(const struct net_bridge_mcast *brmctx, 2041 struct net_bridge_port_group *pg, void *h_addr, 2042 void *srcs, u32 nsrcs, size_t addr_size, 2043 int grec_type) 2044 { 2045 struct net_bridge_group_src *ent; 2046 unsigned long now = jiffies; 2047 bool changed = false; 2048 struct br_ip src_ip; 2049 u32 src_idx; 2050 2051 memset(&src_ip, 0, sizeof(src_ip)); 2052 src_ip.proto = pg->key.addr.proto; 2053 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2054 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2055 ent = br_multicast_find_group_src(pg, &src_ip); 2056 if (!ent) { 2057 ent = br_multicast_new_group_src(pg, &src_ip); 2058 if (ent) 2059 changed = true; 2060 } 2061 2062 if (ent) 2063 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx)); 2064 } 2065 2066 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2067 grec_type)) 2068 changed = true; 2069 2070 return changed; 2071 } 2072 2073 /* State Msg type New state Actions 2074 * INCLUDE (A) IS_EX (B) EXCLUDE (A*B,B-A) (B-A)=0 2075 * Delete (A-B) 2076 * Group Timer=GMI 2077 */ 2078 static void __grp_src_isexc_incl(const struct net_bridge_mcast *brmctx, 2079 struct net_bridge_port_group *pg, void *h_addr, 2080 void *srcs, u32 nsrcs, size_t addr_size, 2081 int grec_type) 2082 { 2083 struct net_bridge_group_src *ent; 2084 struct br_ip src_ip; 2085 u32 src_idx; 2086 2087 hlist_for_each_entry(ent, &pg->src_list, node) 2088 ent->flags |= BR_SGRP_F_DELETE; 2089 2090 memset(&src_ip, 0, sizeof(src_ip)); 2091 src_ip.proto = pg->key.addr.proto; 2092 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2093 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2094 ent = br_multicast_find_group_src(pg, &src_ip); 2095 if (ent) 2096 ent->flags &= ~BR_SGRP_F_DELETE; 2097 else 2098 ent = br_multicast_new_group_src(pg, &src_ip); 2099 if (ent) 2100 br_multicast_fwd_src_handle(ent); 2101 } 2102 2103 br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2104 grec_type); 2105 2106 __grp_src_delete_marked(pg); 2107 } 2108 2109 /* State Msg type New state Actions 2110 * EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=GMI 2111 * Delete (X-A) 2112 * Delete (Y-A) 2113 * Group Timer=GMI 2114 */ 2115 static bool __grp_src_isexc_excl(const struct net_bridge_mcast *brmctx, 2116 struct net_bridge_port_group *pg, void *h_addr, 2117 void *srcs, u32 nsrcs, size_t addr_size, 2118 int grec_type) 2119 { 2120 struct net_bridge_group_src *ent; 2121 unsigned long now = jiffies; 2122 bool changed = false; 2123 struct br_ip src_ip; 2124 u32 src_idx; 2125 2126 hlist_for_each_entry(ent, &pg->src_list, node) 2127 ent->flags |= BR_SGRP_F_DELETE; 2128 2129 memset(&src_ip, 0, sizeof(src_ip)); 2130 src_ip.proto = pg->key.addr.proto; 2131 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2132 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2133 ent = br_multicast_find_group_src(pg, &src_ip); 2134 if (ent) { 2135 ent->flags &= ~BR_SGRP_F_DELETE; 2136 } else { 2137 ent = br_multicast_new_group_src(pg, &src_ip); 2138 if (ent) { 2139 __grp_src_mod_timer(ent, 2140 now + br_multicast_gmi(brmctx)); 2141 changed = true; 2142 } 2143 } 2144 } 2145 2146 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2147 grec_type)) 2148 changed = true; 2149 2150 if (__grp_src_delete_marked(pg)) 2151 changed = true; 2152 2153 return changed; 2154 } 2155 2156 static bool br_multicast_isexc(const struct net_bridge_mcast *brmctx, 2157 struct net_bridge_port_group *pg, void *h_addr, 2158 void *srcs, u32 nsrcs, size_t addr_size, 2159 int grec_type) 2160 { 2161 bool changed = false; 2162 2163 switch (pg->filter_mode) { 2164 case MCAST_INCLUDE: 2165 __grp_src_isexc_incl(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2166 grec_type); 2167 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE); 2168 changed = true; 2169 break; 2170 case MCAST_EXCLUDE: 2171 changed = __grp_src_isexc_excl(brmctx, pg, h_addr, srcs, nsrcs, 2172 addr_size, grec_type); 2173 break; 2174 } 2175 2176 pg->filter_mode = MCAST_EXCLUDE; 2177 mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx)); 2178 2179 return changed; 2180 } 2181 2182 /* State Msg type New state Actions 2183 * INCLUDE (A) TO_IN (B) INCLUDE (A+B) (B)=GMI 2184 * Send Q(G,A-B) 2185 */ 2186 static bool __grp_src_toin_incl(struct net_bridge_mcast *brmctx, 2187 struct net_bridge_mcast_port *pmctx, 2188 struct net_bridge_port_group *pg, void *h_addr, 2189 void *srcs, u32 nsrcs, size_t addr_size, 2190 int grec_type) 2191 { 2192 u32 src_idx, to_send = pg->src_ents; 2193 struct net_bridge_group_src *ent; 2194 unsigned long now = jiffies; 2195 bool changed = false; 2196 struct br_ip src_ip; 2197 2198 hlist_for_each_entry(ent, &pg->src_list, node) 2199 ent->flags |= BR_SGRP_F_SEND; 2200 2201 memset(&src_ip, 0, sizeof(src_ip)); 2202 src_ip.proto = pg->key.addr.proto; 2203 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2204 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2205 ent = br_multicast_find_group_src(pg, &src_ip); 2206 if (ent) { 2207 ent->flags &= ~BR_SGRP_F_SEND; 2208 to_send--; 2209 } else { 2210 ent = br_multicast_new_group_src(pg, &src_ip); 2211 if (ent) 2212 changed = true; 2213 } 2214 if (ent) 2215 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx)); 2216 } 2217 2218 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2219 grec_type)) 2220 changed = true; 2221 2222 if (to_send) 2223 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2224 2225 return changed; 2226 } 2227 2228 /* State Msg type New state Actions 2229 * EXCLUDE (X,Y) TO_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI 2230 * Send Q(G,X-A) 2231 * Send Q(G) 2232 */ 2233 static bool __grp_src_toin_excl(struct net_bridge_mcast *brmctx, 2234 struct net_bridge_mcast_port *pmctx, 2235 struct net_bridge_port_group *pg, void *h_addr, 2236 void *srcs, u32 nsrcs, size_t addr_size, 2237 int grec_type) 2238 { 2239 u32 src_idx, to_send = pg->src_ents; 2240 struct net_bridge_group_src *ent; 2241 unsigned long now = jiffies; 2242 bool changed = false; 2243 struct br_ip src_ip; 2244 2245 hlist_for_each_entry(ent, &pg->src_list, node) 2246 if (timer_pending(&ent->timer)) 2247 ent->flags |= BR_SGRP_F_SEND; 2248 2249 memset(&src_ip, 0, sizeof(src_ip)); 2250 src_ip.proto = pg->key.addr.proto; 2251 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2252 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2253 ent = br_multicast_find_group_src(pg, &src_ip); 2254 if (ent) { 2255 if (timer_pending(&ent->timer)) { 2256 ent->flags &= ~BR_SGRP_F_SEND; 2257 to_send--; 2258 } 2259 } else { 2260 ent = br_multicast_new_group_src(pg, &src_ip); 2261 if (ent) 2262 changed = true; 2263 } 2264 if (ent) 2265 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx)); 2266 } 2267 2268 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2269 grec_type)) 2270 changed = true; 2271 2272 if (to_send) 2273 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2274 2275 __grp_send_query_and_rexmit(brmctx, pmctx, pg); 2276 2277 return changed; 2278 } 2279 2280 static bool br_multicast_toin(struct net_bridge_mcast *brmctx, 2281 struct net_bridge_mcast_port *pmctx, 2282 struct net_bridge_port_group *pg, void *h_addr, 2283 void *srcs, u32 nsrcs, size_t addr_size, 2284 int grec_type) 2285 { 2286 bool changed = false; 2287 2288 switch (pg->filter_mode) { 2289 case MCAST_INCLUDE: 2290 changed = __grp_src_toin_incl(brmctx, pmctx, pg, h_addr, srcs, 2291 nsrcs, addr_size, grec_type); 2292 break; 2293 case MCAST_EXCLUDE: 2294 changed = __grp_src_toin_excl(brmctx, pmctx, pg, h_addr, srcs, 2295 nsrcs, addr_size, grec_type); 2296 break; 2297 } 2298 2299 if (br_multicast_eht_should_del_pg(pg)) { 2300 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE; 2301 br_multicast_find_del_pg(pg->key.port->br, pg); 2302 /* a notification has already been sent and we shouldn't 2303 * access pg after the delete so we have to return false 2304 */ 2305 changed = false; 2306 } 2307 2308 return changed; 2309 } 2310 2311 /* State Msg type New state Actions 2312 * INCLUDE (A) TO_EX (B) EXCLUDE (A*B,B-A) (B-A)=0 2313 * Delete (A-B) 2314 * Send Q(G,A*B) 2315 * Group Timer=GMI 2316 */ 2317 static void __grp_src_toex_incl(struct net_bridge_mcast *brmctx, 2318 struct net_bridge_mcast_port *pmctx, 2319 struct net_bridge_port_group *pg, void *h_addr, 2320 void *srcs, u32 nsrcs, size_t addr_size, 2321 int grec_type) 2322 { 2323 struct net_bridge_group_src *ent; 2324 u32 src_idx, to_send = 0; 2325 struct br_ip src_ip; 2326 2327 hlist_for_each_entry(ent, &pg->src_list, node) 2328 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE; 2329 2330 memset(&src_ip, 0, sizeof(src_ip)); 2331 src_ip.proto = pg->key.addr.proto; 2332 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2333 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2334 ent = br_multicast_find_group_src(pg, &src_ip); 2335 if (ent) { 2336 ent->flags = (ent->flags & ~BR_SGRP_F_DELETE) | 2337 BR_SGRP_F_SEND; 2338 to_send++; 2339 } else { 2340 ent = br_multicast_new_group_src(pg, &src_ip); 2341 } 2342 if (ent) 2343 br_multicast_fwd_src_handle(ent); 2344 } 2345 2346 br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2347 grec_type); 2348 2349 __grp_src_delete_marked(pg); 2350 if (to_send) 2351 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2352 } 2353 2354 /* State Msg type New state Actions 2355 * EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=Group Timer 2356 * Delete (X-A) 2357 * Delete (Y-A) 2358 * Send Q(G,A-Y) 2359 * Group Timer=GMI 2360 */ 2361 static bool __grp_src_toex_excl(struct net_bridge_mcast *brmctx, 2362 struct net_bridge_mcast_port *pmctx, 2363 struct net_bridge_port_group *pg, void *h_addr, 2364 void *srcs, u32 nsrcs, size_t addr_size, 2365 int grec_type) 2366 { 2367 struct net_bridge_group_src *ent; 2368 u32 src_idx, to_send = 0; 2369 bool changed = false; 2370 struct br_ip src_ip; 2371 2372 hlist_for_each_entry(ent, &pg->src_list, node) 2373 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE; 2374 2375 memset(&src_ip, 0, sizeof(src_ip)); 2376 src_ip.proto = pg->key.addr.proto; 2377 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2378 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2379 ent = br_multicast_find_group_src(pg, &src_ip); 2380 if (ent) { 2381 ent->flags &= ~BR_SGRP_F_DELETE; 2382 } else { 2383 ent = br_multicast_new_group_src(pg, &src_ip); 2384 if (ent) { 2385 __grp_src_mod_timer(ent, pg->timer.expires); 2386 changed = true; 2387 } 2388 } 2389 if (ent && timer_pending(&ent->timer)) { 2390 ent->flags |= BR_SGRP_F_SEND; 2391 to_send++; 2392 } 2393 } 2394 2395 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2396 grec_type)) 2397 changed = true; 2398 2399 if (__grp_src_delete_marked(pg)) 2400 changed = true; 2401 if (to_send) 2402 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2403 2404 return changed; 2405 } 2406 2407 static bool br_multicast_toex(struct net_bridge_mcast *brmctx, 2408 struct net_bridge_mcast_port *pmctx, 2409 struct net_bridge_port_group *pg, void *h_addr, 2410 void *srcs, u32 nsrcs, size_t addr_size, 2411 int grec_type) 2412 { 2413 bool changed = false; 2414 2415 switch (pg->filter_mode) { 2416 case MCAST_INCLUDE: 2417 __grp_src_toex_incl(brmctx, pmctx, pg, h_addr, srcs, nsrcs, 2418 addr_size, grec_type); 2419 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE); 2420 changed = true; 2421 break; 2422 case MCAST_EXCLUDE: 2423 changed = __grp_src_toex_excl(brmctx, pmctx, pg, h_addr, srcs, 2424 nsrcs, addr_size, grec_type); 2425 break; 2426 } 2427 2428 pg->filter_mode = MCAST_EXCLUDE; 2429 mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx)); 2430 2431 return changed; 2432 } 2433 2434 /* State Msg type New state Actions 2435 * INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B) 2436 */ 2437 static bool __grp_src_block_incl(struct net_bridge_mcast *brmctx, 2438 struct net_bridge_mcast_port *pmctx, 2439 struct net_bridge_port_group *pg, void *h_addr, 2440 void *srcs, u32 nsrcs, size_t addr_size, int grec_type) 2441 { 2442 struct net_bridge_group_src *ent; 2443 u32 src_idx, to_send = 0; 2444 bool changed = false; 2445 struct br_ip src_ip; 2446 2447 hlist_for_each_entry(ent, &pg->src_list, node) 2448 ent->flags &= ~BR_SGRP_F_SEND; 2449 2450 memset(&src_ip, 0, sizeof(src_ip)); 2451 src_ip.proto = pg->key.addr.proto; 2452 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2453 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2454 ent = br_multicast_find_group_src(pg, &src_ip); 2455 if (ent) { 2456 ent->flags |= BR_SGRP_F_SEND; 2457 to_send++; 2458 } 2459 } 2460 2461 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2462 grec_type)) 2463 changed = true; 2464 2465 if (to_send) 2466 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2467 2468 return changed; 2469 } 2470 2471 /* State Msg type New state Actions 2472 * EXCLUDE (X,Y) BLOCK (A) EXCLUDE (X+(A-Y),Y) (A-X-Y)=Group Timer 2473 * Send Q(G,A-Y) 2474 */ 2475 static bool __grp_src_block_excl(struct net_bridge_mcast *brmctx, 2476 struct net_bridge_mcast_port *pmctx, 2477 struct net_bridge_port_group *pg, void *h_addr, 2478 void *srcs, u32 nsrcs, size_t addr_size, int grec_type) 2479 { 2480 struct net_bridge_group_src *ent; 2481 u32 src_idx, to_send = 0; 2482 bool changed = false; 2483 struct br_ip src_ip; 2484 2485 hlist_for_each_entry(ent, &pg->src_list, node) 2486 ent->flags &= ~BR_SGRP_F_SEND; 2487 2488 memset(&src_ip, 0, sizeof(src_ip)); 2489 src_ip.proto = pg->key.addr.proto; 2490 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2491 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2492 ent = br_multicast_find_group_src(pg, &src_ip); 2493 if (!ent) { 2494 ent = br_multicast_new_group_src(pg, &src_ip); 2495 if (ent) { 2496 __grp_src_mod_timer(ent, pg->timer.expires); 2497 changed = true; 2498 } 2499 } 2500 if (ent && timer_pending(&ent->timer)) { 2501 ent->flags |= BR_SGRP_F_SEND; 2502 to_send++; 2503 } 2504 } 2505 2506 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2507 grec_type)) 2508 changed = true; 2509 2510 if (to_send) 2511 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2512 2513 return changed; 2514 } 2515 2516 static bool br_multicast_block(struct net_bridge_mcast *brmctx, 2517 struct net_bridge_mcast_port *pmctx, 2518 struct net_bridge_port_group *pg, void *h_addr, 2519 void *srcs, u32 nsrcs, size_t addr_size, int grec_type) 2520 { 2521 bool changed = false; 2522 2523 switch (pg->filter_mode) { 2524 case MCAST_INCLUDE: 2525 changed = __grp_src_block_incl(brmctx, pmctx, pg, h_addr, srcs, 2526 nsrcs, addr_size, grec_type); 2527 break; 2528 case MCAST_EXCLUDE: 2529 changed = __grp_src_block_excl(brmctx, pmctx, pg, h_addr, srcs, 2530 nsrcs, addr_size, grec_type); 2531 break; 2532 } 2533 2534 if ((pg->filter_mode == MCAST_INCLUDE && hlist_empty(&pg->src_list)) || 2535 br_multicast_eht_should_del_pg(pg)) { 2536 if (br_multicast_eht_should_del_pg(pg)) 2537 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE; 2538 br_multicast_find_del_pg(pg->key.port->br, pg); 2539 /* a notification has already been sent and we shouldn't 2540 * access pg after the delete so we have to return false 2541 */ 2542 changed = false; 2543 } 2544 2545 return changed; 2546 } 2547 2548 static struct net_bridge_port_group * 2549 br_multicast_find_port(struct net_bridge_mdb_entry *mp, 2550 struct net_bridge_port *p, 2551 const unsigned char *src) 2552 { 2553 struct net_bridge *br __maybe_unused = mp->br; 2554 struct net_bridge_port_group *pg; 2555 2556 for (pg = mlock_dereference(mp->ports, br); 2557 pg; 2558 pg = mlock_dereference(pg->next, br)) 2559 if (br_port_group_equal(pg, p, src)) 2560 return pg; 2561 2562 return NULL; 2563 } 2564 2565 static int br_ip4_multicast_igmp3_report(struct net_bridge_mcast *brmctx, 2566 struct net_bridge_mcast_port *pmctx, 2567 struct sk_buff *skb, 2568 u16 vid) 2569 { 2570 bool igmpv2 = brmctx->multicast_igmp_version == 2; 2571 struct net_bridge_mdb_entry *mdst; 2572 struct net_bridge_port_group *pg; 2573 const unsigned char *src; 2574 struct igmpv3_report *ih; 2575 struct igmpv3_grec *grec; 2576 int i, len, num, type; 2577 __be32 group, *h_addr; 2578 bool changed = false; 2579 int err = 0; 2580 u16 nsrcs; 2581 2582 ih = igmpv3_report_hdr(skb); 2583 num = ntohs(ih->ngrec); 2584 len = skb_transport_offset(skb) + sizeof(*ih); 2585 2586 for (i = 0; i < num; i++) { 2587 len += sizeof(*grec); 2588 if (!ip_mc_may_pull(skb, len)) 2589 return -EINVAL; 2590 2591 grec = (void *)(skb->data + len - sizeof(*grec)); 2592 group = grec->grec_mca; 2593 type = grec->grec_type; 2594 nsrcs = ntohs(grec->grec_nsrcs); 2595 2596 len += nsrcs * 4; 2597 if (!ip_mc_may_pull(skb, len)) 2598 return -EINVAL; 2599 2600 switch (type) { 2601 case IGMPV3_MODE_IS_INCLUDE: 2602 case IGMPV3_MODE_IS_EXCLUDE: 2603 case IGMPV3_CHANGE_TO_INCLUDE: 2604 case IGMPV3_CHANGE_TO_EXCLUDE: 2605 case IGMPV3_ALLOW_NEW_SOURCES: 2606 case IGMPV3_BLOCK_OLD_SOURCES: 2607 break; 2608 2609 default: 2610 continue; 2611 } 2612 2613 src = eth_hdr(skb)->h_source; 2614 if (nsrcs == 0 && 2615 (type == IGMPV3_CHANGE_TO_INCLUDE || 2616 type == IGMPV3_MODE_IS_INCLUDE)) { 2617 if (!pmctx || igmpv2) { 2618 br_ip4_multicast_leave_group(brmctx, pmctx, 2619 group, vid, src); 2620 continue; 2621 } 2622 } else { 2623 err = br_ip4_multicast_add_group(brmctx, pmctx, group, 2624 vid, src, igmpv2); 2625 if (err) 2626 break; 2627 } 2628 2629 if (!pmctx || igmpv2) 2630 continue; 2631 2632 spin_lock_bh(&brmctx->br->multicast_lock); 2633 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 2634 goto unlock_continue; 2635 2636 mdst = br_mdb_ip4_get(brmctx->br, group, vid); 2637 if (!mdst) 2638 goto unlock_continue; 2639 pg = br_multicast_find_port(mdst, pmctx->port, src); 2640 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT)) 2641 goto unlock_continue; 2642 /* reload grec and host addr */ 2643 grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4)); 2644 h_addr = &ip_hdr(skb)->saddr; 2645 switch (type) { 2646 case IGMPV3_ALLOW_NEW_SOURCES: 2647 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 2648 grec->grec_src, 2649 nsrcs, sizeof(__be32), type); 2650 break; 2651 case IGMPV3_MODE_IS_INCLUDE: 2652 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 2653 grec->grec_src, 2654 nsrcs, sizeof(__be32), type); 2655 break; 2656 case IGMPV3_MODE_IS_EXCLUDE: 2657 changed = br_multicast_isexc(brmctx, pg, h_addr, 2658 grec->grec_src, 2659 nsrcs, sizeof(__be32), type); 2660 break; 2661 case IGMPV3_CHANGE_TO_INCLUDE: 2662 changed = br_multicast_toin(brmctx, pmctx, pg, h_addr, 2663 grec->grec_src, 2664 nsrcs, sizeof(__be32), type); 2665 break; 2666 case IGMPV3_CHANGE_TO_EXCLUDE: 2667 changed = br_multicast_toex(brmctx, pmctx, pg, h_addr, 2668 grec->grec_src, 2669 nsrcs, sizeof(__be32), type); 2670 break; 2671 case IGMPV3_BLOCK_OLD_SOURCES: 2672 changed = br_multicast_block(brmctx, pmctx, pg, h_addr, 2673 grec->grec_src, 2674 nsrcs, sizeof(__be32), type); 2675 break; 2676 } 2677 if (changed) 2678 br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB); 2679 unlock_continue: 2680 spin_unlock_bh(&brmctx->br->multicast_lock); 2681 } 2682 2683 return err; 2684 } 2685 2686 #if IS_ENABLED(CONFIG_IPV6) 2687 static int br_ip6_multicast_mld2_report(struct net_bridge_mcast *brmctx, 2688 struct net_bridge_mcast_port *pmctx, 2689 struct sk_buff *skb, 2690 u16 vid) 2691 { 2692 bool mldv1 = brmctx->multicast_mld_version == 1; 2693 struct net_bridge_mdb_entry *mdst; 2694 struct net_bridge_port_group *pg; 2695 unsigned int nsrcs_offset; 2696 const unsigned char *src; 2697 struct icmp6hdr *icmp6h; 2698 struct in6_addr *h_addr; 2699 struct mld2_grec *grec; 2700 unsigned int grec_len; 2701 bool changed = false; 2702 int i, len, num; 2703 int err = 0; 2704 2705 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h))) 2706 return -EINVAL; 2707 2708 icmp6h = icmp6_hdr(skb); 2709 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 2710 len = skb_transport_offset(skb) + sizeof(*icmp6h); 2711 2712 for (i = 0; i < num; i++) { 2713 __be16 *_nsrcs, __nsrcs; 2714 u16 nsrcs; 2715 2716 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs); 2717 2718 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < 2719 nsrcs_offset + sizeof(__nsrcs)) 2720 return -EINVAL; 2721 2722 _nsrcs = skb_header_pointer(skb, nsrcs_offset, 2723 sizeof(__nsrcs), &__nsrcs); 2724 if (!_nsrcs) 2725 return -EINVAL; 2726 2727 nsrcs = ntohs(*_nsrcs); 2728 grec_len = struct_size(grec, grec_src, nsrcs); 2729 2730 if (!ipv6_mc_may_pull(skb, len + grec_len)) 2731 return -EINVAL; 2732 2733 grec = (struct mld2_grec *)(skb->data + len); 2734 len += grec_len; 2735 2736 switch (grec->grec_type) { 2737 case MLD2_MODE_IS_INCLUDE: 2738 case MLD2_MODE_IS_EXCLUDE: 2739 case MLD2_CHANGE_TO_INCLUDE: 2740 case MLD2_CHANGE_TO_EXCLUDE: 2741 case MLD2_ALLOW_NEW_SOURCES: 2742 case MLD2_BLOCK_OLD_SOURCES: 2743 break; 2744 2745 default: 2746 continue; 2747 } 2748 2749 src = eth_hdr(skb)->h_source; 2750 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE || 2751 grec->grec_type == MLD2_MODE_IS_INCLUDE) && 2752 nsrcs == 0) { 2753 if (!pmctx || mldv1) { 2754 br_ip6_multicast_leave_group(brmctx, pmctx, 2755 &grec->grec_mca, 2756 vid, src); 2757 continue; 2758 } 2759 } else { 2760 err = br_ip6_multicast_add_group(brmctx, pmctx, 2761 &grec->grec_mca, vid, 2762 src, mldv1); 2763 if (err) 2764 break; 2765 } 2766 2767 if (!pmctx || mldv1) 2768 continue; 2769 2770 spin_lock_bh(&brmctx->br->multicast_lock); 2771 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 2772 goto unlock_continue; 2773 2774 mdst = br_mdb_ip6_get(brmctx->br, &grec->grec_mca, vid); 2775 if (!mdst) 2776 goto unlock_continue; 2777 pg = br_multicast_find_port(mdst, pmctx->port, src); 2778 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT)) 2779 goto unlock_continue; 2780 h_addr = &ipv6_hdr(skb)->saddr; 2781 switch (grec->grec_type) { 2782 case MLD2_ALLOW_NEW_SOURCES: 2783 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 2784 grec->grec_src, nsrcs, 2785 sizeof(struct in6_addr), 2786 grec->grec_type); 2787 break; 2788 case MLD2_MODE_IS_INCLUDE: 2789 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 2790 grec->grec_src, nsrcs, 2791 sizeof(struct in6_addr), 2792 grec->grec_type); 2793 break; 2794 case MLD2_MODE_IS_EXCLUDE: 2795 changed = br_multicast_isexc(brmctx, pg, h_addr, 2796 grec->grec_src, nsrcs, 2797 sizeof(struct in6_addr), 2798 grec->grec_type); 2799 break; 2800 case MLD2_CHANGE_TO_INCLUDE: 2801 changed = br_multicast_toin(brmctx, pmctx, pg, h_addr, 2802 grec->grec_src, nsrcs, 2803 sizeof(struct in6_addr), 2804 grec->grec_type); 2805 break; 2806 case MLD2_CHANGE_TO_EXCLUDE: 2807 changed = br_multicast_toex(brmctx, pmctx, pg, h_addr, 2808 grec->grec_src, nsrcs, 2809 sizeof(struct in6_addr), 2810 grec->grec_type); 2811 break; 2812 case MLD2_BLOCK_OLD_SOURCES: 2813 changed = br_multicast_block(brmctx, pmctx, pg, h_addr, 2814 grec->grec_src, nsrcs, 2815 sizeof(struct in6_addr), 2816 grec->grec_type); 2817 break; 2818 } 2819 if (changed) 2820 br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB); 2821 unlock_continue: 2822 spin_unlock_bh(&brmctx->br->multicast_lock); 2823 } 2824 2825 return err; 2826 } 2827 #endif 2828 2829 static bool br_ip4_multicast_select_querier(struct net_bridge_mcast *brmctx, 2830 struct net_bridge_mcast_port *pmctx, 2831 __be32 saddr) 2832 { 2833 struct net_bridge_port *port = pmctx ? pmctx->port : NULL; 2834 2835 if (!timer_pending(&brmctx->ip4_own_query.timer) && 2836 !timer_pending(&brmctx->ip4_other_query.timer)) 2837 goto update; 2838 2839 if (!brmctx->ip4_querier.addr.src.ip4) 2840 goto update; 2841 2842 if (ntohl(saddr) <= ntohl(brmctx->ip4_querier.addr.src.ip4)) 2843 goto update; 2844 2845 return false; 2846 2847 update: 2848 brmctx->ip4_querier.addr.src.ip4 = saddr; 2849 2850 /* update protected by general multicast_lock by caller */ 2851 rcu_assign_pointer(brmctx->ip4_querier.port, port); 2852 2853 return true; 2854 } 2855 2856 #if IS_ENABLED(CONFIG_IPV6) 2857 static bool br_ip6_multicast_select_querier(struct net_bridge_mcast *brmctx, 2858 struct net_bridge_mcast_port *pmctx, 2859 struct in6_addr *saddr) 2860 { 2861 struct net_bridge_port *port = pmctx ? pmctx->port : NULL; 2862 2863 if (!timer_pending(&brmctx->ip6_own_query.timer) && 2864 !timer_pending(&brmctx->ip6_other_query.timer)) 2865 goto update; 2866 2867 if (ipv6_addr_cmp(saddr, &brmctx->ip6_querier.addr.src.ip6) <= 0) 2868 goto update; 2869 2870 return false; 2871 2872 update: 2873 brmctx->ip6_querier.addr.src.ip6 = *saddr; 2874 2875 /* update protected by general multicast_lock by caller */ 2876 rcu_assign_pointer(brmctx->ip6_querier.port, port); 2877 2878 return true; 2879 } 2880 #endif 2881 2882 static void 2883 br_multicast_update_query_timer(struct net_bridge_mcast *brmctx, 2884 struct bridge_mcast_other_query *query, 2885 unsigned long max_delay) 2886 { 2887 if (!timer_pending(&query->timer)) 2888 query->delay_time = jiffies + max_delay; 2889 2890 mod_timer(&query->timer, jiffies + brmctx->multicast_querier_interval); 2891 } 2892 2893 static void br_port_mc_router_state_change(struct net_bridge_port *p, 2894 bool is_mc_router) 2895 { 2896 struct switchdev_attr attr = { 2897 .orig_dev = p->dev, 2898 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER, 2899 .flags = SWITCHDEV_F_DEFER, 2900 .u.mrouter = is_mc_router, 2901 }; 2902 2903 switchdev_port_attr_set(p->dev, &attr, NULL); 2904 } 2905 2906 static struct net_bridge_port * 2907 br_multicast_rport_from_node(struct net_bridge_mcast *brmctx, 2908 struct hlist_head *mc_router_list, 2909 struct hlist_node *rlist) 2910 { 2911 struct net_bridge_mcast_port *pmctx; 2912 2913 #if IS_ENABLED(CONFIG_IPV6) 2914 if (mc_router_list == &brmctx->ip6_mc_router_list) 2915 pmctx = hlist_entry(rlist, struct net_bridge_mcast_port, 2916 ip6_rlist); 2917 else 2918 #endif 2919 pmctx = hlist_entry(rlist, struct net_bridge_mcast_port, 2920 ip4_rlist); 2921 2922 return pmctx->port; 2923 } 2924 2925 static struct hlist_node * 2926 br_multicast_get_rport_slot(struct net_bridge_mcast *brmctx, 2927 struct net_bridge_port *port, 2928 struct hlist_head *mc_router_list) 2929 2930 { 2931 struct hlist_node *slot = NULL; 2932 struct net_bridge_port *p; 2933 struct hlist_node *rlist; 2934 2935 hlist_for_each(rlist, mc_router_list) { 2936 p = br_multicast_rport_from_node(brmctx, mc_router_list, rlist); 2937 2938 if ((unsigned long)port >= (unsigned long)p) 2939 break; 2940 2941 slot = rlist; 2942 } 2943 2944 return slot; 2945 } 2946 2947 static bool br_multicast_no_router_otherpf(struct net_bridge_mcast_port *pmctx, 2948 struct hlist_node *rnode) 2949 { 2950 #if IS_ENABLED(CONFIG_IPV6) 2951 if (rnode != &pmctx->ip6_rlist) 2952 return hlist_unhashed(&pmctx->ip6_rlist); 2953 else 2954 return hlist_unhashed(&pmctx->ip4_rlist); 2955 #else 2956 return true; 2957 #endif 2958 } 2959 2960 /* Add port to router_list 2961 * list is maintained ordered by pointer value 2962 * and locked by br->multicast_lock and RCU 2963 */ 2964 static void br_multicast_add_router(struct net_bridge_mcast *brmctx, 2965 struct net_bridge_mcast_port *pmctx, 2966 struct hlist_node *rlist, 2967 struct hlist_head *mc_router_list) 2968 { 2969 struct hlist_node *slot; 2970 2971 if (!hlist_unhashed(rlist)) 2972 return; 2973 2974 slot = br_multicast_get_rport_slot(brmctx, pmctx->port, mc_router_list); 2975 2976 if (slot) 2977 hlist_add_behind_rcu(rlist, slot); 2978 else 2979 hlist_add_head_rcu(rlist, mc_router_list); 2980 2981 /* For backwards compatibility for now, only notify if we 2982 * switched from no IPv4/IPv6 multicast router to a new 2983 * IPv4 or IPv6 multicast router. 2984 */ 2985 if (br_multicast_no_router_otherpf(pmctx, rlist)) { 2986 br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_NEWMDB); 2987 br_port_mc_router_state_change(pmctx->port, true); 2988 } 2989 } 2990 2991 /* Add port to router_list 2992 * list is maintained ordered by pointer value 2993 * and locked by br->multicast_lock and RCU 2994 */ 2995 static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx, 2996 struct net_bridge_mcast_port *pmctx) 2997 { 2998 br_multicast_add_router(brmctx, pmctx, &pmctx->ip4_rlist, 2999 &brmctx->ip4_mc_router_list); 3000 } 3001 3002 /* Add port to router_list 3003 * list is maintained ordered by pointer value 3004 * and locked by br->multicast_lock and RCU 3005 */ 3006 static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx, 3007 struct net_bridge_mcast_port *pmctx) 3008 { 3009 #if IS_ENABLED(CONFIG_IPV6) 3010 br_multicast_add_router(brmctx, pmctx, &pmctx->ip6_rlist, 3011 &brmctx->ip6_mc_router_list); 3012 #endif 3013 } 3014 3015 static void br_multicast_mark_router(struct net_bridge_mcast *brmctx, 3016 struct net_bridge_mcast_port *pmctx, 3017 struct timer_list *timer, 3018 struct hlist_node *rlist, 3019 struct hlist_head *mc_router_list) 3020 { 3021 unsigned long now = jiffies; 3022 3023 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3024 return; 3025 3026 if (!pmctx) { 3027 if (brmctx->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) { 3028 if (!br_ip4_multicast_is_router(brmctx) && 3029 !br_ip6_multicast_is_router(brmctx)) 3030 br_mc_router_state_change(brmctx->br, true); 3031 mod_timer(timer, now + brmctx->multicast_querier_interval); 3032 } 3033 return; 3034 } 3035 3036 if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED || 3037 pmctx->multicast_router == MDB_RTR_TYPE_PERM) 3038 return; 3039 3040 br_multicast_add_router(brmctx, pmctx, rlist, mc_router_list); 3041 mod_timer(timer, now + brmctx->multicast_querier_interval); 3042 } 3043 3044 static void br_ip4_multicast_mark_router(struct net_bridge_mcast *brmctx, 3045 struct net_bridge_mcast_port *pmctx) 3046 { 3047 struct timer_list *timer = &brmctx->ip4_mc_router_timer; 3048 struct hlist_node *rlist = NULL; 3049 3050 if (pmctx) { 3051 timer = &pmctx->ip4_mc_router_timer; 3052 rlist = &pmctx->ip4_rlist; 3053 } 3054 3055 br_multicast_mark_router(brmctx, pmctx, timer, rlist, 3056 &brmctx->ip4_mc_router_list); 3057 } 3058 3059 static void br_ip6_multicast_mark_router(struct net_bridge_mcast *brmctx, 3060 struct net_bridge_mcast_port *pmctx) 3061 { 3062 #if IS_ENABLED(CONFIG_IPV6) 3063 struct timer_list *timer = &brmctx->ip6_mc_router_timer; 3064 struct hlist_node *rlist = NULL; 3065 3066 if (pmctx) { 3067 timer = &pmctx->ip6_mc_router_timer; 3068 rlist = &pmctx->ip6_rlist; 3069 } 3070 3071 br_multicast_mark_router(brmctx, pmctx, timer, rlist, 3072 &brmctx->ip6_mc_router_list); 3073 #endif 3074 } 3075 3076 static void 3077 br_ip4_multicast_query_received(struct net_bridge_mcast *brmctx, 3078 struct net_bridge_mcast_port *pmctx, 3079 struct bridge_mcast_other_query *query, 3080 struct br_ip *saddr, 3081 unsigned long max_delay) 3082 { 3083 if (!br_ip4_multicast_select_querier(brmctx, pmctx, saddr->src.ip4)) 3084 return; 3085 3086 br_multicast_update_query_timer(brmctx, query, max_delay); 3087 br_ip4_multicast_mark_router(brmctx, pmctx); 3088 } 3089 3090 #if IS_ENABLED(CONFIG_IPV6) 3091 static void 3092 br_ip6_multicast_query_received(struct net_bridge_mcast *brmctx, 3093 struct net_bridge_mcast_port *pmctx, 3094 struct bridge_mcast_other_query *query, 3095 struct br_ip *saddr, 3096 unsigned long max_delay) 3097 { 3098 if (!br_ip6_multicast_select_querier(brmctx, pmctx, &saddr->src.ip6)) 3099 return; 3100 3101 br_multicast_update_query_timer(brmctx, query, max_delay); 3102 br_ip6_multicast_mark_router(brmctx, pmctx); 3103 } 3104 #endif 3105 3106 static void br_ip4_multicast_query(struct net_bridge_mcast *brmctx, 3107 struct net_bridge_mcast_port *pmctx, 3108 struct sk_buff *skb, 3109 u16 vid) 3110 { 3111 unsigned int transport_len = ip_transport_len(skb); 3112 const struct iphdr *iph = ip_hdr(skb); 3113 struct igmphdr *ih = igmp_hdr(skb); 3114 struct net_bridge_mdb_entry *mp; 3115 struct igmpv3_query *ih3; 3116 struct net_bridge_port_group *p; 3117 struct net_bridge_port_group __rcu **pp; 3118 struct br_ip saddr; 3119 unsigned long max_delay; 3120 unsigned long now = jiffies; 3121 __be32 group; 3122 3123 spin_lock(&brmctx->br->multicast_lock); 3124 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3125 goto out; 3126 3127 group = ih->group; 3128 3129 if (transport_len == sizeof(*ih)) { 3130 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 3131 3132 if (!max_delay) { 3133 max_delay = 10 * HZ; 3134 group = 0; 3135 } 3136 } else if (transport_len >= sizeof(*ih3)) { 3137 ih3 = igmpv3_query_hdr(skb); 3138 if (ih3->nsrcs || 3139 (brmctx->multicast_igmp_version == 3 && group && 3140 ih3->suppress)) 3141 goto out; 3142 3143 max_delay = ih3->code ? 3144 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 3145 } else { 3146 goto out; 3147 } 3148 3149 if (!group) { 3150 saddr.proto = htons(ETH_P_IP); 3151 saddr.src.ip4 = iph->saddr; 3152 3153 br_ip4_multicast_query_received(brmctx, pmctx, 3154 &brmctx->ip4_other_query, 3155 &saddr, max_delay); 3156 goto out; 3157 } 3158 3159 mp = br_mdb_ip4_get(brmctx->br, group, vid); 3160 if (!mp) 3161 goto out; 3162 3163 max_delay *= brmctx->multicast_last_member_count; 3164 3165 if (mp->host_joined && 3166 (timer_pending(&mp->timer) ? 3167 time_after(mp->timer.expires, now + max_delay) : 3168 try_to_del_timer_sync(&mp->timer) >= 0)) 3169 mod_timer(&mp->timer, now + max_delay); 3170 3171 for (pp = &mp->ports; 3172 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 3173 pp = &p->next) { 3174 if (timer_pending(&p->timer) ? 3175 time_after(p->timer.expires, now + max_delay) : 3176 try_to_del_timer_sync(&p->timer) >= 0 && 3177 (brmctx->multicast_igmp_version == 2 || 3178 p->filter_mode == MCAST_EXCLUDE)) 3179 mod_timer(&p->timer, now + max_delay); 3180 } 3181 3182 out: 3183 spin_unlock(&brmctx->br->multicast_lock); 3184 } 3185 3186 #if IS_ENABLED(CONFIG_IPV6) 3187 static int br_ip6_multicast_query(struct net_bridge_mcast *brmctx, 3188 struct net_bridge_mcast_port *pmctx, 3189 struct sk_buff *skb, 3190 u16 vid) 3191 { 3192 unsigned int transport_len = ipv6_transport_len(skb); 3193 struct mld_msg *mld; 3194 struct net_bridge_mdb_entry *mp; 3195 struct mld2_query *mld2q; 3196 struct net_bridge_port_group *p; 3197 struct net_bridge_port_group __rcu **pp; 3198 struct br_ip saddr; 3199 unsigned long max_delay; 3200 unsigned long now = jiffies; 3201 unsigned int offset = skb_transport_offset(skb); 3202 const struct in6_addr *group = NULL; 3203 bool is_general_query; 3204 int err = 0; 3205 3206 spin_lock(&brmctx->br->multicast_lock); 3207 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3208 goto out; 3209 3210 if (transport_len == sizeof(*mld)) { 3211 if (!pskb_may_pull(skb, offset + sizeof(*mld))) { 3212 err = -EINVAL; 3213 goto out; 3214 } 3215 mld = (struct mld_msg *) icmp6_hdr(skb); 3216 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); 3217 if (max_delay) 3218 group = &mld->mld_mca; 3219 } else { 3220 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) { 3221 err = -EINVAL; 3222 goto out; 3223 } 3224 mld2q = (struct mld2_query *)icmp6_hdr(skb); 3225 if (!mld2q->mld2q_nsrcs) 3226 group = &mld2q->mld2q_mca; 3227 if (brmctx->multicast_mld_version == 2 && 3228 !ipv6_addr_any(&mld2q->mld2q_mca) && 3229 mld2q->mld2q_suppress) 3230 goto out; 3231 3232 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); 3233 } 3234 3235 is_general_query = group && ipv6_addr_any(group); 3236 3237 if (is_general_query) { 3238 saddr.proto = htons(ETH_P_IPV6); 3239 saddr.src.ip6 = ipv6_hdr(skb)->saddr; 3240 3241 br_ip6_multicast_query_received(brmctx, pmctx, 3242 &brmctx->ip6_other_query, 3243 &saddr, max_delay); 3244 goto out; 3245 } else if (!group) { 3246 goto out; 3247 } 3248 3249 mp = br_mdb_ip6_get(brmctx->br, group, vid); 3250 if (!mp) 3251 goto out; 3252 3253 max_delay *= brmctx->multicast_last_member_count; 3254 if (mp->host_joined && 3255 (timer_pending(&mp->timer) ? 3256 time_after(mp->timer.expires, now + max_delay) : 3257 try_to_del_timer_sync(&mp->timer) >= 0)) 3258 mod_timer(&mp->timer, now + max_delay); 3259 3260 for (pp = &mp->ports; 3261 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 3262 pp = &p->next) { 3263 if (timer_pending(&p->timer) ? 3264 time_after(p->timer.expires, now + max_delay) : 3265 try_to_del_timer_sync(&p->timer) >= 0 && 3266 (brmctx->multicast_mld_version == 1 || 3267 p->filter_mode == MCAST_EXCLUDE)) 3268 mod_timer(&p->timer, now + max_delay); 3269 } 3270 3271 out: 3272 spin_unlock(&brmctx->br->multicast_lock); 3273 return err; 3274 } 3275 #endif 3276 3277 static void 3278 br_multicast_leave_group(struct net_bridge_mcast *brmctx, 3279 struct net_bridge_mcast_port *pmctx, 3280 struct br_ip *group, 3281 struct bridge_mcast_other_query *other_query, 3282 struct bridge_mcast_own_query *own_query, 3283 const unsigned char *src) 3284 { 3285 struct net_bridge_mdb_entry *mp; 3286 struct net_bridge_port_group *p; 3287 unsigned long now; 3288 unsigned long time; 3289 3290 spin_lock(&brmctx->br->multicast_lock); 3291 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3292 goto out; 3293 3294 mp = br_mdb_ip_get(brmctx->br, group); 3295 if (!mp) 3296 goto out; 3297 3298 if (pmctx && (pmctx->port->flags & BR_MULTICAST_FAST_LEAVE)) { 3299 struct net_bridge_port_group __rcu **pp; 3300 3301 for (pp = &mp->ports; 3302 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 3303 pp = &p->next) { 3304 if (!br_port_group_equal(p, pmctx->port, src)) 3305 continue; 3306 3307 if (p->flags & MDB_PG_FLAGS_PERMANENT) 3308 break; 3309 3310 p->flags |= MDB_PG_FLAGS_FAST_LEAVE; 3311 br_multicast_del_pg(mp, p, pp); 3312 } 3313 goto out; 3314 } 3315 3316 if (timer_pending(&other_query->timer)) 3317 goto out; 3318 3319 if (br_opt_get(brmctx->br, BROPT_MULTICAST_QUERIER)) { 3320 __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &mp->addr, 3321 false, 0, NULL); 3322 3323 time = jiffies + brmctx->multicast_last_member_count * 3324 brmctx->multicast_last_member_interval; 3325 3326 mod_timer(&own_query->timer, time); 3327 3328 for (p = mlock_dereference(mp->ports, brmctx->br); 3329 p != NULL && pmctx != NULL; 3330 p = mlock_dereference(p->next, brmctx->br)) { 3331 if (!br_port_group_equal(p, pmctx->port, src)) 3332 continue; 3333 3334 if (!hlist_unhashed(&p->mglist) && 3335 (timer_pending(&p->timer) ? 3336 time_after(p->timer.expires, time) : 3337 try_to_del_timer_sync(&p->timer) >= 0)) { 3338 mod_timer(&p->timer, time); 3339 } 3340 3341 break; 3342 } 3343 } 3344 3345 now = jiffies; 3346 time = now + brmctx->multicast_last_member_count * 3347 brmctx->multicast_last_member_interval; 3348 3349 if (!pmctx) { 3350 if (mp->host_joined && 3351 (timer_pending(&mp->timer) ? 3352 time_after(mp->timer.expires, time) : 3353 try_to_del_timer_sync(&mp->timer) >= 0)) { 3354 mod_timer(&mp->timer, time); 3355 } 3356 3357 goto out; 3358 } 3359 3360 for (p = mlock_dereference(mp->ports, brmctx->br); 3361 p != NULL; 3362 p = mlock_dereference(p->next, brmctx->br)) { 3363 if (p->key.port != pmctx->port) 3364 continue; 3365 3366 if (!hlist_unhashed(&p->mglist) && 3367 (timer_pending(&p->timer) ? 3368 time_after(p->timer.expires, time) : 3369 try_to_del_timer_sync(&p->timer) >= 0)) { 3370 mod_timer(&p->timer, time); 3371 } 3372 3373 break; 3374 } 3375 out: 3376 spin_unlock(&brmctx->br->multicast_lock); 3377 } 3378 3379 static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx, 3380 struct net_bridge_mcast_port *pmctx, 3381 __be32 group, 3382 __u16 vid, 3383 const unsigned char *src) 3384 { 3385 struct br_ip br_group; 3386 struct bridge_mcast_own_query *own_query; 3387 3388 if (ipv4_is_local_multicast(group)) 3389 return; 3390 3391 own_query = pmctx ? &pmctx->ip4_own_query : &brmctx->ip4_own_query; 3392 3393 memset(&br_group, 0, sizeof(br_group)); 3394 br_group.dst.ip4 = group; 3395 br_group.proto = htons(ETH_P_IP); 3396 br_group.vid = vid; 3397 3398 br_multicast_leave_group(brmctx, pmctx, &br_group, 3399 &brmctx->ip4_other_query, 3400 own_query, src); 3401 } 3402 3403 #if IS_ENABLED(CONFIG_IPV6) 3404 static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx, 3405 struct net_bridge_mcast_port *pmctx, 3406 const struct in6_addr *group, 3407 __u16 vid, 3408 const unsigned char *src) 3409 { 3410 struct br_ip br_group; 3411 struct bridge_mcast_own_query *own_query; 3412 3413 if (ipv6_addr_is_ll_all_nodes(group)) 3414 return; 3415 3416 own_query = pmctx ? &pmctx->ip6_own_query : &brmctx->ip6_own_query; 3417 3418 memset(&br_group, 0, sizeof(br_group)); 3419 br_group.dst.ip6 = *group; 3420 br_group.proto = htons(ETH_P_IPV6); 3421 br_group.vid = vid; 3422 3423 br_multicast_leave_group(brmctx, pmctx, &br_group, 3424 &brmctx->ip6_other_query, 3425 own_query, src); 3426 } 3427 #endif 3428 3429 static void br_multicast_err_count(const struct net_bridge *br, 3430 const struct net_bridge_port *p, 3431 __be16 proto) 3432 { 3433 struct bridge_mcast_stats __percpu *stats; 3434 struct bridge_mcast_stats *pstats; 3435 3436 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 3437 return; 3438 3439 if (p) 3440 stats = p->mcast_stats; 3441 else 3442 stats = br->mcast_stats; 3443 if (WARN_ON(!stats)) 3444 return; 3445 3446 pstats = this_cpu_ptr(stats); 3447 3448 u64_stats_update_begin(&pstats->syncp); 3449 switch (proto) { 3450 case htons(ETH_P_IP): 3451 pstats->mstats.igmp_parse_errors++; 3452 break; 3453 #if IS_ENABLED(CONFIG_IPV6) 3454 case htons(ETH_P_IPV6): 3455 pstats->mstats.mld_parse_errors++; 3456 break; 3457 #endif 3458 } 3459 u64_stats_update_end(&pstats->syncp); 3460 } 3461 3462 static void br_multicast_pim(struct net_bridge_mcast *brmctx, 3463 struct net_bridge_mcast_port *pmctx, 3464 const struct sk_buff *skb) 3465 { 3466 unsigned int offset = skb_transport_offset(skb); 3467 struct pimhdr *pimhdr, _pimhdr; 3468 3469 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr); 3470 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION || 3471 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO) 3472 return; 3473 3474 spin_lock(&brmctx->br->multicast_lock); 3475 br_ip4_multicast_mark_router(brmctx, pmctx); 3476 spin_unlock(&brmctx->br->multicast_lock); 3477 } 3478 3479 static int br_ip4_multicast_mrd_rcv(struct net_bridge_mcast *brmctx, 3480 struct net_bridge_mcast_port *pmctx, 3481 struct sk_buff *skb) 3482 { 3483 if (ip_hdr(skb)->protocol != IPPROTO_IGMP || 3484 igmp_hdr(skb)->type != IGMP_MRDISC_ADV) 3485 return -ENOMSG; 3486 3487 spin_lock(&brmctx->br->multicast_lock); 3488 br_ip4_multicast_mark_router(brmctx, pmctx); 3489 spin_unlock(&brmctx->br->multicast_lock); 3490 3491 return 0; 3492 } 3493 3494 static int br_multicast_ipv4_rcv(struct net_bridge_mcast *brmctx, 3495 struct net_bridge_mcast_port *pmctx, 3496 struct sk_buff *skb, 3497 u16 vid) 3498 { 3499 struct net_bridge_port *p = pmctx ? pmctx->port : NULL; 3500 const unsigned char *src; 3501 struct igmphdr *ih; 3502 int err; 3503 3504 err = ip_mc_check_igmp(skb); 3505 3506 if (err == -ENOMSG) { 3507 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) { 3508 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 3509 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) { 3510 if (ip_hdr(skb)->protocol == IPPROTO_PIM) 3511 br_multicast_pim(brmctx, pmctx, skb); 3512 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) { 3513 br_ip4_multicast_mrd_rcv(brmctx, pmctx, skb); 3514 } 3515 3516 return 0; 3517 } else if (err < 0) { 3518 br_multicast_err_count(brmctx->br, p, skb->protocol); 3519 return err; 3520 } 3521 3522 ih = igmp_hdr(skb); 3523 src = eth_hdr(skb)->h_source; 3524 BR_INPUT_SKB_CB(skb)->igmp = ih->type; 3525 3526 switch (ih->type) { 3527 case IGMP_HOST_MEMBERSHIP_REPORT: 3528 case IGMPV2_HOST_MEMBERSHIP_REPORT: 3529 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 3530 err = br_ip4_multicast_add_group(brmctx, pmctx, ih->group, vid, 3531 src, true); 3532 break; 3533 case IGMPV3_HOST_MEMBERSHIP_REPORT: 3534 err = br_ip4_multicast_igmp3_report(brmctx, pmctx, skb, vid); 3535 break; 3536 case IGMP_HOST_MEMBERSHIP_QUERY: 3537 br_ip4_multicast_query(brmctx, pmctx, skb, vid); 3538 break; 3539 case IGMP_HOST_LEAVE_MESSAGE: 3540 br_ip4_multicast_leave_group(brmctx, pmctx, ih->group, vid, src); 3541 break; 3542 } 3543 3544 br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp, 3545 BR_MCAST_DIR_RX); 3546 3547 return err; 3548 } 3549 3550 #if IS_ENABLED(CONFIG_IPV6) 3551 static void br_ip6_multicast_mrd_rcv(struct net_bridge_mcast *brmctx, 3552 struct net_bridge_mcast_port *pmctx, 3553 struct sk_buff *skb) 3554 { 3555 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV) 3556 return; 3557 3558 spin_lock(&brmctx->br->multicast_lock); 3559 br_ip6_multicast_mark_router(brmctx, pmctx); 3560 spin_unlock(&brmctx->br->multicast_lock); 3561 } 3562 3563 static int br_multicast_ipv6_rcv(struct net_bridge_mcast *brmctx, 3564 struct net_bridge_mcast_port *pmctx, 3565 struct sk_buff *skb, 3566 u16 vid) 3567 { 3568 struct net_bridge_port *p = pmctx ? pmctx->port : NULL; 3569 const unsigned char *src; 3570 struct mld_msg *mld; 3571 int err; 3572 3573 err = ipv6_mc_check_mld(skb); 3574 3575 if (err == -ENOMSG || err == -ENODATA) { 3576 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr)) 3577 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 3578 if (err == -ENODATA && 3579 ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) 3580 br_ip6_multicast_mrd_rcv(brmctx, pmctx, skb); 3581 3582 return 0; 3583 } else if (err < 0) { 3584 br_multicast_err_count(brmctx->br, p, skb->protocol); 3585 return err; 3586 } 3587 3588 mld = (struct mld_msg *)skb_transport_header(skb); 3589 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type; 3590 3591 switch (mld->mld_type) { 3592 case ICMPV6_MGM_REPORT: 3593 src = eth_hdr(skb)->h_source; 3594 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 3595 err = br_ip6_multicast_add_group(brmctx, pmctx, &mld->mld_mca, 3596 vid, src, true); 3597 break; 3598 case ICMPV6_MLD2_REPORT: 3599 err = br_ip6_multicast_mld2_report(brmctx, pmctx, skb, vid); 3600 break; 3601 case ICMPV6_MGM_QUERY: 3602 err = br_ip6_multicast_query(brmctx, pmctx, skb, vid); 3603 break; 3604 case ICMPV6_MGM_REDUCTION: 3605 src = eth_hdr(skb)->h_source; 3606 br_ip6_multicast_leave_group(brmctx, pmctx, &mld->mld_mca, vid, 3607 src); 3608 break; 3609 } 3610 3611 br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp, 3612 BR_MCAST_DIR_RX); 3613 3614 return err; 3615 } 3616 #endif 3617 3618 int br_multicast_rcv(struct net_bridge_mcast **brmctx, 3619 struct net_bridge_mcast_port **pmctx, 3620 struct net_bridge_vlan *vlan, 3621 struct sk_buff *skb, u16 vid) 3622 { 3623 int ret = 0; 3624 3625 BR_INPUT_SKB_CB(skb)->igmp = 0; 3626 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 3627 3628 if (!br_opt_get((*brmctx)->br, BROPT_MULTICAST_ENABLED)) 3629 return 0; 3630 3631 if (br_opt_get((*brmctx)->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) && vlan) { 3632 const struct net_bridge_vlan *masterv; 3633 3634 /* the vlan has the master flag set only when transmitting 3635 * through the bridge device 3636 */ 3637 if (br_vlan_is_master(vlan)) { 3638 masterv = vlan; 3639 *brmctx = &vlan->br_mcast_ctx; 3640 *pmctx = NULL; 3641 } else { 3642 masterv = vlan->brvlan; 3643 *brmctx = &vlan->brvlan->br_mcast_ctx; 3644 *pmctx = &vlan->port_mcast_ctx; 3645 } 3646 3647 if (!(masterv->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED)) 3648 return 0; 3649 } 3650 3651 switch (skb->protocol) { 3652 case htons(ETH_P_IP): 3653 ret = br_multicast_ipv4_rcv(*brmctx, *pmctx, skb, vid); 3654 break; 3655 #if IS_ENABLED(CONFIG_IPV6) 3656 case htons(ETH_P_IPV6): 3657 ret = br_multicast_ipv6_rcv(*brmctx, *pmctx, skb, vid); 3658 break; 3659 #endif 3660 } 3661 3662 return ret; 3663 } 3664 3665 static void br_multicast_query_expired(struct net_bridge_mcast *brmctx, 3666 struct bridge_mcast_own_query *query, 3667 struct bridge_mcast_querier *querier) 3668 { 3669 spin_lock(&brmctx->br->multicast_lock); 3670 if (br_multicast_ctx_vlan_disabled(brmctx)) 3671 goto out; 3672 3673 if (query->startup_sent < brmctx->multicast_startup_query_count) 3674 query->startup_sent++; 3675 3676 RCU_INIT_POINTER(querier->port, NULL); 3677 br_multicast_send_query(brmctx, NULL, query); 3678 out: 3679 spin_unlock(&brmctx->br->multicast_lock); 3680 } 3681 3682 static void br_ip4_multicast_query_expired(struct timer_list *t) 3683 { 3684 struct net_bridge_mcast *brmctx = from_timer(brmctx, t, 3685 ip4_own_query.timer); 3686 3687 br_multicast_query_expired(brmctx, &brmctx->ip4_own_query, 3688 &brmctx->ip4_querier); 3689 } 3690 3691 #if IS_ENABLED(CONFIG_IPV6) 3692 static void br_ip6_multicast_query_expired(struct timer_list *t) 3693 { 3694 struct net_bridge_mcast *brmctx = from_timer(brmctx, t, 3695 ip6_own_query.timer); 3696 3697 br_multicast_query_expired(brmctx, &brmctx->ip6_own_query, 3698 &brmctx->ip6_querier); 3699 } 3700 #endif 3701 3702 static void br_multicast_gc_work(struct work_struct *work) 3703 { 3704 struct net_bridge *br = container_of(work, struct net_bridge, 3705 mcast_gc_work); 3706 HLIST_HEAD(deleted_head); 3707 3708 spin_lock_bh(&br->multicast_lock); 3709 hlist_move_list(&br->mcast_gc_list, &deleted_head); 3710 spin_unlock_bh(&br->multicast_lock); 3711 3712 br_multicast_gc(&deleted_head); 3713 } 3714 3715 void br_multicast_ctx_init(struct net_bridge *br, 3716 struct net_bridge_vlan *vlan, 3717 struct net_bridge_mcast *brmctx) 3718 { 3719 brmctx->br = br; 3720 brmctx->vlan = vlan; 3721 brmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 3722 brmctx->multicast_last_member_count = 2; 3723 brmctx->multicast_startup_query_count = 2; 3724 3725 brmctx->multicast_last_member_interval = HZ; 3726 brmctx->multicast_query_response_interval = 10 * HZ; 3727 brmctx->multicast_startup_query_interval = 125 * HZ / 4; 3728 brmctx->multicast_query_interval = 125 * HZ; 3729 brmctx->multicast_querier_interval = 255 * HZ; 3730 brmctx->multicast_membership_interval = 260 * HZ; 3731 3732 brmctx->ip4_other_query.delay_time = 0; 3733 brmctx->ip4_querier.port = NULL; 3734 brmctx->multicast_igmp_version = 2; 3735 #if IS_ENABLED(CONFIG_IPV6) 3736 brmctx->multicast_mld_version = 1; 3737 brmctx->ip6_other_query.delay_time = 0; 3738 brmctx->ip6_querier.port = NULL; 3739 #endif 3740 3741 timer_setup(&brmctx->ip4_mc_router_timer, 3742 br_ip4_multicast_local_router_expired, 0); 3743 timer_setup(&brmctx->ip4_other_query.timer, 3744 br_ip4_multicast_querier_expired, 0); 3745 timer_setup(&brmctx->ip4_own_query.timer, 3746 br_ip4_multicast_query_expired, 0); 3747 #if IS_ENABLED(CONFIG_IPV6) 3748 timer_setup(&brmctx->ip6_mc_router_timer, 3749 br_ip6_multicast_local_router_expired, 0); 3750 timer_setup(&brmctx->ip6_other_query.timer, 3751 br_ip6_multicast_querier_expired, 0); 3752 timer_setup(&brmctx->ip6_own_query.timer, 3753 br_ip6_multicast_query_expired, 0); 3754 #endif 3755 } 3756 3757 void br_multicast_ctx_deinit(struct net_bridge_mcast *brmctx) 3758 { 3759 __br_multicast_stop(brmctx); 3760 } 3761 3762 void br_multicast_init(struct net_bridge *br) 3763 { 3764 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX; 3765 3766 br_multicast_ctx_init(br, NULL, &br->multicast_ctx); 3767 3768 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true); 3769 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true); 3770 3771 spin_lock_init(&br->multicast_lock); 3772 INIT_HLIST_HEAD(&br->mdb_list); 3773 INIT_HLIST_HEAD(&br->mcast_gc_list); 3774 INIT_WORK(&br->mcast_gc_work, br_multicast_gc_work); 3775 } 3776 3777 static void br_ip4_multicast_join_snoopers(struct net_bridge *br) 3778 { 3779 struct in_device *in_dev = in_dev_get(br->dev); 3780 3781 if (!in_dev) 3782 return; 3783 3784 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 3785 in_dev_put(in_dev); 3786 } 3787 3788 #if IS_ENABLED(CONFIG_IPV6) 3789 static void br_ip6_multicast_join_snoopers(struct net_bridge *br) 3790 { 3791 struct in6_addr addr; 3792 3793 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 3794 ipv6_dev_mc_inc(br->dev, &addr); 3795 } 3796 #else 3797 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br) 3798 { 3799 } 3800 #endif 3801 3802 void br_multicast_join_snoopers(struct net_bridge *br) 3803 { 3804 br_ip4_multicast_join_snoopers(br); 3805 br_ip6_multicast_join_snoopers(br); 3806 } 3807 3808 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br) 3809 { 3810 struct in_device *in_dev = in_dev_get(br->dev); 3811 3812 if (WARN_ON(!in_dev)) 3813 return; 3814 3815 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 3816 in_dev_put(in_dev); 3817 } 3818 3819 #if IS_ENABLED(CONFIG_IPV6) 3820 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 3821 { 3822 struct in6_addr addr; 3823 3824 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 3825 ipv6_dev_mc_dec(br->dev, &addr); 3826 } 3827 #else 3828 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 3829 { 3830 } 3831 #endif 3832 3833 void br_multicast_leave_snoopers(struct net_bridge *br) 3834 { 3835 br_ip4_multicast_leave_snoopers(br); 3836 br_ip6_multicast_leave_snoopers(br); 3837 } 3838 3839 static void __br_multicast_open_query(struct net_bridge *br, 3840 struct bridge_mcast_own_query *query) 3841 { 3842 query->startup_sent = 0; 3843 3844 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 3845 return; 3846 3847 mod_timer(&query->timer, jiffies); 3848 } 3849 3850 static void __br_multicast_open(struct net_bridge_mcast *brmctx) 3851 { 3852 __br_multicast_open_query(brmctx->br, &brmctx->ip4_own_query); 3853 #if IS_ENABLED(CONFIG_IPV6) 3854 __br_multicast_open_query(brmctx->br, &brmctx->ip6_own_query); 3855 #endif 3856 } 3857 3858 void br_multicast_open(struct net_bridge *br) 3859 { 3860 ASSERT_RTNL(); 3861 3862 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { 3863 struct net_bridge_vlan_group *vg; 3864 struct net_bridge_vlan *vlan; 3865 3866 vg = br_vlan_group(br); 3867 if (vg) { 3868 list_for_each_entry(vlan, &vg->vlan_list, vlist) { 3869 struct net_bridge_mcast *brmctx; 3870 3871 brmctx = &vlan->br_mcast_ctx; 3872 if (br_vlan_is_brentry(vlan) && 3873 !br_multicast_ctx_vlan_disabled(brmctx)) 3874 __br_multicast_open(&vlan->br_mcast_ctx); 3875 } 3876 } 3877 } 3878 3879 __br_multicast_open(&br->multicast_ctx); 3880 } 3881 3882 static void __br_multicast_stop(struct net_bridge_mcast *brmctx) 3883 { 3884 del_timer_sync(&brmctx->ip4_mc_router_timer); 3885 del_timer_sync(&brmctx->ip4_other_query.timer); 3886 del_timer_sync(&brmctx->ip4_own_query.timer); 3887 #if IS_ENABLED(CONFIG_IPV6) 3888 del_timer_sync(&brmctx->ip6_mc_router_timer); 3889 del_timer_sync(&brmctx->ip6_other_query.timer); 3890 del_timer_sync(&brmctx->ip6_own_query.timer); 3891 #endif 3892 } 3893 3894 void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on) 3895 { 3896 struct net_bridge *br; 3897 3898 /* it's okay to check for the flag without the multicast lock because it 3899 * can only change under RTNL -> multicast_lock, we need the latter to 3900 * sync with timers and packets 3901 */ 3902 if (on == !!(vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) 3903 return; 3904 3905 if (br_vlan_is_master(vlan)) { 3906 br = vlan->br; 3907 3908 if (!br_vlan_is_brentry(vlan) || 3909 (on && 3910 br_multicast_ctx_vlan_global_disabled(&vlan->br_mcast_ctx))) 3911 return; 3912 3913 spin_lock_bh(&br->multicast_lock); 3914 vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED; 3915 spin_unlock_bh(&br->multicast_lock); 3916 3917 if (on) 3918 __br_multicast_open(&vlan->br_mcast_ctx); 3919 else 3920 __br_multicast_stop(&vlan->br_mcast_ctx); 3921 } else { 3922 struct net_bridge_mcast *brmctx; 3923 3924 brmctx = br_multicast_port_ctx_get_global(&vlan->port_mcast_ctx); 3925 if (on && br_multicast_ctx_vlan_global_disabled(brmctx)) 3926 return; 3927 3928 br = vlan->port->br; 3929 spin_lock_bh(&br->multicast_lock); 3930 vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED; 3931 if (on) 3932 __br_multicast_enable_port_ctx(&vlan->port_mcast_ctx); 3933 else 3934 __br_multicast_disable_port_ctx(&vlan->port_mcast_ctx); 3935 spin_unlock_bh(&br->multicast_lock); 3936 } 3937 } 3938 3939 void br_multicast_toggle_vlan(struct net_bridge_vlan *vlan, bool on) 3940 { 3941 struct net_bridge_port *p; 3942 3943 if (WARN_ON_ONCE(!br_vlan_is_master(vlan))) 3944 return; 3945 3946 list_for_each_entry(p, &vlan->br->port_list, list) { 3947 struct net_bridge_vlan *vport; 3948 3949 vport = br_vlan_find(nbp_vlan_group(p), vlan->vid); 3950 if (!vport) 3951 continue; 3952 br_multicast_toggle_one_vlan(vport, on); 3953 } 3954 } 3955 3956 int br_multicast_toggle_vlan_snooping(struct net_bridge *br, bool on, 3957 struct netlink_ext_ack *extack) 3958 { 3959 struct net_bridge_vlan_group *vg; 3960 struct net_bridge_vlan *vlan; 3961 struct net_bridge_port *p; 3962 3963 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) == on) 3964 return 0; 3965 3966 if (on && !br_opt_get(br, BROPT_VLAN_ENABLED)) { 3967 NL_SET_ERR_MSG_MOD(extack, "Cannot enable multicast vlan snooping with vlan filtering disabled"); 3968 return -EINVAL; 3969 } 3970 3971 vg = br_vlan_group(br); 3972 if (!vg) 3973 return 0; 3974 3975 br_opt_toggle(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED, on); 3976 3977 /* disable/enable non-vlan mcast contexts based on vlan snooping */ 3978 if (on) 3979 __br_multicast_stop(&br->multicast_ctx); 3980 else 3981 __br_multicast_open(&br->multicast_ctx); 3982 list_for_each_entry(p, &br->port_list, list) { 3983 if (on) 3984 br_multicast_disable_port(p); 3985 else 3986 br_multicast_enable_port(p); 3987 } 3988 3989 list_for_each_entry(vlan, &vg->vlan_list, vlist) 3990 br_multicast_toggle_vlan(vlan, on); 3991 3992 return 0; 3993 } 3994 3995 bool br_multicast_toggle_global_vlan(struct net_bridge_vlan *vlan, bool on) 3996 { 3997 ASSERT_RTNL(); 3998 3999 /* BR_VLFLAG_GLOBAL_MCAST_ENABLED relies on eventual consistency and 4000 * requires only RTNL to change 4001 */ 4002 if (on == !!(vlan->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED)) 4003 return false; 4004 4005 vlan->priv_flags ^= BR_VLFLAG_GLOBAL_MCAST_ENABLED; 4006 br_multicast_toggle_vlan(vlan, on); 4007 4008 return true; 4009 } 4010 4011 void br_multicast_stop(struct net_bridge *br) 4012 { 4013 ASSERT_RTNL(); 4014 4015 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { 4016 struct net_bridge_vlan_group *vg; 4017 struct net_bridge_vlan *vlan; 4018 4019 vg = br_vlan_group(br); 4020 if (vg) { 4021 list_for_each_entry(vlan, &vg->vlan_list, vlist) { 4022 struct net_bridge_mcast *brmctx; 4023 4024 brmctx = &vlan->br_mcast_ctx; 4025 if (br_vlan_is_brentry(vlan) && 4026 !br_multicast_ctx_vlan_disabled(brmctx)) 4027 __br_multicast_stop(&vlan->br_mcast_ctx); 4028 } 4029 } 4030 } 4031 4032 __br_multicast_stop(&br->multicast_ctx); 4033 } 4034 4035 void br_multicast_dev_del(struct net_bridge *br) 4036 { 4037 struct net_bridge_mdb_entry *mp; 4038 HLIST_HEAD(deleted_head); 4039 struct hlist_node *tmp; 4040 4041 spin_lock_bh(&br->multicast_lock); 4042 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) 4043 br_multicast_del_mdb_entry(mp); 4044 hlist_move_list(&br->mcast_gc_list, &deleted_head); 4045 spin_unlock_bh(&br->multicast_lock); 4046 4047 br_multicast_ctx_deinit(&br->multicast_ctx); 4048 br_multicast_gc(&deleted_head); 4049 cancel_work_sync(&br->mcast_gc_work); 4050 4051 rcu_barrier(); 4052 } 4053 4054 int br_multicast_set_router(struct net_bridge *br, unsigned long val) 4055 { 4056 struct net_bridge_mcast *brmctx = &br->multicast_ctx; 4057 int err = -EINVAL; 4058 4059 spin_lock_bh(&br->multicast_lock); 4060 4061 switch (val) { 4062 case MDB_RTR_TYPE_DISABLED: 4063 case MDB_RTR_TYPE_PERM: 4064 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM); 4065 del_timer(&brmctx->ip4_mc_router_timer); 4066 #if IS_ENABLED(CONFIG_IPV6) 4067 del_timer(&brmctx->ip6_mc_router_timer); 4068 #endif 4069 brmctx->multicast_router = val; 4070 err = 0; 4071 break; 4072 case MDB_RTR_TYPE_TEMP_QUERY: 4073 if (brmctx->multicast_router != MDB_RTR_TYPE_TEMP_QUERY) 4074 br_mc_router_state_change(br, false); 4075 brmctx->multicast_router = val; 4076 err = 0; 4077 break; 4078 } 4079 4080 spin_unlock_bh(&br->multicast_lock); 4081 4082 return err; 4083 } 4084 4085 static void 4086 br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted) 4087 { 4088 if (!deleted) 4089 return; 4090 4091 /* For backwards compatibility for now, only notify if there is 4092 * no multicast router anymore for both IPv4 and IPv6. 4093 */ 4094 if (!hlist_unhashed(&pmctx->ip4_rlist)) 4095 return; 4096 #if IS_ENABLED(CONFIG_IPV6) 4097 if (!hlist_unhashed(&pmctx->ip6_rlist)) 4098 return; 4099 #endif 4100 4101 br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_DELMDB); 4102 br_port_mc_router_state_change(pmctx->port, false); 4103 4104 /* don't allow timer refresh */ 4105 if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP) 4106 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 4107 } 4108 4109 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) 4110 { 4111 struct net_bridge_mcast *brmctx = &p->br->multicast_ctx; 4112 struct net_bridge_mcast_port *pmctx = &p->multicast_ctx; 4113 unsigned long now = jiffies; 4114 int err = -EINVAL; 4115 bool del = false; 4116 4117 spin_lock(&p->br->multicast_lock); 4118 if (pmctx->multicast_router == val) { 4119 /* Refresh the temp router port timer */ 4120 if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP) { 4121 mod_timer(&pmctx->ip4_mc_router_timer, 4122 now + brmctx->multicast_querier_interval); 4123 #if IS_ENABLED(CONFIG_IPV6) 4124 mod_timer(&pmctx->ip6_mc_router_timer, 4125 now + brmctx->multicast_querier_interval); 4126 #endif 4127 } 4128 err = 0; 4129 goto unlock; 4130 } 4131 switch (val) { 4132 case MDB_RTR_TYPE_DISABLED: 4133 pmctx->multicast_router = MDB_RTR_TYPE_DISABLED; 4134 del |= br_ip4_multicast_rport_del(pmctx); 4135 del_timer(&pmctx->ip4_mc_router_timer); 4136 del |= br_ip6_multicast_rport_del(pmctx); 4137 #if IS_ENABLED(CONFIG_IPV6) 4138 del_timer(&pmctx->ip6_mc_router_timer); 4139 #endif 4140 br_multicast_rport_del_notify(pmctx, del); 4141 break; 4142 case MDB_RTR_TYPE_TEMP_QUERY: 4143 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 4144 del |= br_ip4_multicast_rport_del(pmctx); 4145 del |= br_ip6_multicast_rport_del(pmctx); 4146 br_multicast_rport_del_notify(pmctx, del); 4147 break; 4148 case MDB_RTR_TYPE_PERM: 4149 pmctx->multicast_router = MDB_RTR_TYPE_PERM; 4150 del_timer(&pmctx->ip4_mc_router_timer); 4151 br_ip4_multicast_add_router(brmctx, pmctx); 4152 #if IS_ENABLED(CONFIG_IPV6) 4153 del_timer(&pmctx->ip6_mc_router_timer); 4154 #endif 4155 br_ip6_multicast_add_router(brmctx, pmctx); 4156 break; 4157 case MDB_RTR_TYPE_TEMP: 4158 pmctx->multicast_router = MDB_RTR_TYPE_TEMP; 4159 br_ip4_multicast_mark_router(brmctx, pmctx); 4160 br_ip6_multicast_mark_router(brmctx, pmctx); 4161 break; 4162 default: 4163 goto unlock; 4164 } 4165 err = 0; 4166 unlock: 4167 spin_unlock(&p->br->multicast_lock); 4168 4169 return err; 4170 } 4171 4172 static void br_multicast_start_querier(struct net_bridge_mcast *brmctx, 4173 struct bridge_mcast_own_query *query) 4174 { 4175 struct net_bridge_port *port; 4176 4177 __br_multicast_open_query(brmctx->br, query); 4178 4179 rcu_read_lock(); 4180 list_for_each_entry_rcu(port, &brmctx->br->port_list, list) { 4181 struct bridge_mcast_own_query *ip4_own_query; 4182 #if IS_ENABLED(CONFIG_IPV6) 4183 struct bridge_mcast_own_query *ip6_own_query; 4184 #endif 4185 4186 if (br_multicast_port_ctx_state_stopped(&port->multicast_ctx)) 4187 continue; 4188 4189 if (br_multicast_ctx_is_vlan(brmctx)) { 4190 struct net_bridge_vlan *vlan; 4191 4192 vlan = br_vlan_find(nbp_vlan_group(port), brmctx->vlan->vid); 4193 if (!vlan || 4194 br_multicast_port_ctx_state_stopped(&vlan->port_mcast_ctx)) 4195 continue; 4196 4197 ip4_own_query = &vlan->port_mcast_ctx.ip4_own_query; 4198 #if IS_ENABLED(CONFIG_IPV6) 4199 ip6_own_query = &vlan->port_mcast_ctx.ip6_own_query; 4200 #endif 4201 } else { 4202 ip4_own_query = &port->multicast_ctx.ip4_own_query; 4203 #if IS_ENABLED(CONFIG_IPV6) 4204 ip6_own_query = &port->multicast_ctx.ip6_own_query; 4205 #endif 4206 } 4207 4208 if (query == &brmctx->ip4_own_query) 4209 br_multicast_enable(ip4_own_query); 4210 #if IS_ENABLED(CONFIG_IPV6) 4211 else 4212 br_multicast_enable(ip6_own_query); 4213 #endif 4214 } 4215 rcu_read_unlock(); 4216 } 4217 4218 int br_multicast_toggle(struct net_bridge *br, unsigned long val, 4219 struct netlink_ext_ack *extack) 4220 { 4221 struct net_bridge_port *port; 4222 bool change_snoopers = false; 4223 int err = 0; 4224 4225 spin_lock_bh(&br->multicast_lock); 4226 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val) 4227 goto unlock; 4228 4229 err = br_mc_disabled_update(br->dev, val, extack); 4230 if (err == -EOPNOTSUPP) 4231 err = 0; 4232 if (err) 4233 goto unlock; 4234 4235 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val); 4236 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) { 4237 change_snoopers = true; 4238 goto unlock; 4239 } 4240 4241 if (!netif_running(br->dev)) 4242 goto unlock; 4243 4244 br_multicast_open(br); 4245 list_for_each_entry(port, &br->port_list, list) 4246 __br_multicast_enable_port_ctx(&port->multicast_ctx); 4247 4248 change_snoopers = true; 4249 4250 unlock: 4251 spin_unlock_bh(&br->multicast_lock); 4252 4253 /* br_multicast_join_snoopers has the potential to cause 4254 * an MLD Report/Leave to be delivered to br_multicast_rcv, 4255 * which would in turn call br_multicast_add_group, which would 4256 * attempt to acquire multicast_lock. This function should be 4257 * called after the lock has been released to avoid deadlocks on 4258 * multicast_lock. 4259 * 4260 * br_multicast_leave_snoopers does not have the problem since 4261 * br_multicast_rcv first checks BROPT_MULTICAST_ENABLED, and 4262 * returns without calling br_multicast_ipv4/6_rcv if it's not 4263 * enabled. Moved both functions out just for symmetry. 4264 */ 4265 if (change_snoopers) { 4266 if (br_opt_get(br, BROPT_MULTICAST_ENABLED)) 4267 br_multicast_join_snoopers(br); 4268 else 4269 br_multicast_leave_snoopers(br); 4270 } 4271 4272 return err; 4273 } 4274 4275 bool br_multicast_enabled(const struct net_device *dev) 4276 { 4277 struct net_bridge *br = netdev_priv(dev); 4278 4279 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED); 4280 } 4281 EXPORT_SYMBOL_GPL(br_multicast_enabled); 4282 4283 bool br_multicast_router(const struct net_device *dev) 4284 { 4285 struct net_bridge *br = netdev_priv(dev); 4286 bool is_router; 4287 4288 spin_lock_bh(&br->multicast_lock); 4289 is_router = br_multicast_is_router(&br->multicast_ctx, NULL); 4290 spin_unlock_bh(&br->multicast_lock); 4291 return is_router; 4292 } 4293 EXPORT_SYMBOL_GPL(br_multicast_router); 4294 4295 int br_multicast_set_querier(struct net_bridge *br, unsigned long val) 4296 { 4297 struct net_bridge_mcast *brmctx = &br->multicast_ctx; 4298 unsigned long max_delay; 4299 4300 val = !!val; 4301 4302 spin_lock_bh(&br->multicast_lock); 4303 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val) 4304 goto unlock; 4305 4306 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val); 4307 if (!val) 4308 goto unlock; 4309 4310 max_delay = brmctx->multicast_query_response_interval; 4311 4312 if (!timer_pending(&brmctx->ip4_other_query.timer)) 4313 brmctx->ip4_other_query.delay_time = jiffies + max_delay; 4314 4315 br_multicast_start_querier(brmctx, &brmctx->ip4_own_query); 4316 4317 #if IS_ENABLED(CONFIG_IPV6) 4318 if (!timer_pending(&brmctx->ip6_other_query.timer)) 4319 brmctx->ip6_other_query.delay_time = jiffies + max_delay; 4320 4321 br_multicast_start_querier(brmctx, &brmctx->ip6_own_query); 4322 #endif 4323 4324 unlock: 4325 spin_unlock_bh(&br->multicast_lock); 4326 4327 return 0; 4328 } 4329 4330 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val) 4331 { 4332 /* Currently we support only version 2 and 3 */ 4333 switch (val) { 4334 case 2: 4335 case 3: 4336 break; 4337 default: 4338 return -EINVAL; 4339 } 4340 4341 spin_lock_bh(&br->multicast_lock); 4342 br->multicast_ctx.multicast_igmp_version = val; 4343 spin_unlock_bh(&br->multicast_lock); 4344 4345 return 0; 4346 } 4347 4348 #if IS_ENABLED(CONFIG_IPV6) 4349 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val) 4350 { 4351 /* Currently we support version 1 and 2 */ 4352 switch (val) { 4353 case 1: 4354 case 2: 4355 break; 4356 default: 4357 return -EINVAL; 4358 } 4359 4360 spin_lock_bh(&br->multicast_lock); 4361 br->multicast_ctx.multicast_mld_version = val; 4362 spin_unlock_bh(&br->multicast_lock); 4363 4364 return 0; 4365 } 4366 #endif 4367 4368 /** 4369 * br_multicast_list_adjacent - Returns snooped multicast addresses 4370 * @dev: The bridge port adjacent to which to retrieve addresses 4371 * @br_ip_list: The list to store found, snooped multicast IP addresses in 4372 * 4373 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast 4374 * snooping feature on all bridge ports of dev's bridge device, excluding 4375 * the addresses from dev itself. 4376 * 4377 * Returns the number of items added to br_ip_list. 4378 * 4379 * Notes: 4380 * - br_ip_list needs to be initialized by caller 4381 * - br_ip_list might contain duplicates in the end 4382 * (needs to be taken care of by caller) 4383 * - br_ip_list needs to be freed by caller 4384 */ 4385 int br_multicast_list_adjacent(struct net_device *dev, 4386 struct list_head *br_ip_list) 4387 { 4388 struct net_bridge *br; 4389 struct net_bridge_port *port; 4390 struct net_bridge_port_group *group; 4391 struct br_ip_list *entry; 4392 int count = 0; 4393 4394 rcu_read_lock(); 4395 if (!br_ip_list || !netif_is_bridge_port(dev)) 4396 goto unlock; 4397 4398 port = br_port_get_rcu(dev); 4399 if (!port || !port->br) 4400 goto unlock; 4401 4402 br = port->br; 4403 4404 list_for_each_entry_rcu(port, &br->port_list, list) { 4405 if (!port->dev || port->dev == dev) 4406 continue; 4407 4408 hlist_for_each_entry_rcu(group, &port->mglist, mglist) { 4409 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 4410 if (!entry) 4411 goto unlock; 4412 4413 entry->addr = group->key.addr; 4414 list_add(&entry->list, br_ip_list); 4415 count++; 4416 } 4417 } 4418 4419 unlock: 4420 rcu_read_unlock(); 4421 return count; 4422 } 4423 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); 4424 4425 /** 4426 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge 4427 * @dev: The bridge port providing the bridge on which to check for a querier 4428 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 4429 * 4430 * Checks whether the given interface has a bridge on top and if so returns 4431 * true if a valid querier exists anywhere on the bridged link layer. 4432 * Otherwise returns false. 4433 */ 4434 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto) 4435 { 4436 struct net_bridge *br; 4437 struct net_bridge_port *port; 4438 struct ethhdr eth; 4439 bool ret = false; 4440 4441 rcu_read_lock(); 4442 if (!netif_is_bridge_port(dev)) 4443 goto unlock; 4444 4445 port = br_port_get_rcu(dev); 4446 if (!port || !port->br) 4447 goto unlock; 4448 4449 br = port->br; 4450 4451 memset(ð, 0, sizeof(eth)); 4452 eth.h_proto = htons(proto); 4453 4454 ret = br_multicast_querier_exists(&br->multicast_ctx, ð, NULL); 4455 4456 unlock: 4457 rcu_read_unlock(); 4458 return ret; 4459 } 4460 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere); 4461 4462 /** 4463 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port 4464 * @dev: The bridge port adjacent to which to check for a querier 4465 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 4466 * 4467 * Checks whether the given interface has a bridge on top and if so returns 4468 * true if a selected querier is behind one of the other ports of this 4469 * bridge. Otherwise returns false. 4470 */ 4471 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) 4472 { 4473 struct net_bridge_mcast *brmctx; 4474 struct net_bridge *br; 4475 struct net_bridge_port *port; 4476 bool ret = false; 4477 4478 rcu_read_lock(); 4479 if (!netif_is_bridge_port(dev)) 4480 goto unlock; 4481 4482 port = br_port_get_rcu(dev); 4483 if (!port || !port->br) 4484 goto unlock; 4485 4486 br = port->br; 4487 brmctx = &br->multicast_ctx; 4488 4489 switch (proto) { 4490 case ETH_P_IP: 4491 if (!timer_pending(&brmctx->ip4_other_query.timer) || 4492 rcu_dereference(brmctx->ip4_querier.port) == port) 4493 goto unlock; 4494 break; 4495 #if IS_ENABLED(CONFIG_IPV6) 4496 case ETH_P_IPV6: 4497 if (!timer_pending(&brmctx->ip6_other_query.timer) || 4498 rcu_dereference(brmctx->ip6_querier.port) == port) 4499 goto unlock; 4500 break; 4501 #endif 4502 default: 4503 goto unlock; 4504 } 4505 4506 ret = true; 4507 unlock: 4508 rcu_read_unlock(); 4509 return ret; 4510 } 4511 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); 4512 4513 /** 4514 * br_multicast_has_router_adjacent - Checks for a router behind a bridge port 4515 * @dev: The bridge port adjacent to which to check for a multicast router 4516 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 4517 * 4518 * Checks whether the given interface has a bridge on top and if so returns 4519 * true if a multicast router is behind one of the other ports of this 4520 * bridge. Otherwise returns false. 4521 */ 4522 bool br_multicast_has_router_adjacent(struct net_device *dev, int proto) 4523 { 4524 struct net_bridge_mcast_port *pmctx; 4525 struct net_bridge_mcast *brmctx; 4526 struct net_bridge_port *port; 4527 bool ret = false; 4528 4529 rcu_read_lock(); 4530 port = br_port_get_check_rcu(dev); 4531 if (!port) 4532 goto unlock; 4533 4534 brmctx = &port->br->multicast_ctx; 4535 switch (proto) { 4536 case ETH_P_IP: 4537 hlist_for_each_entry_rcu(pmctx, &brmctx->ip4_mc_router_list, 4538 ip4_rlist) { 4539 if (pmctx->port == port) 4540 continue; 4541 4542 ret = true; 4543 goto unlock; 4544 } 4545 break; 4546 #if IS_ENABLED(CONFIG_IPV6) 4547 case ETH_P_IPV6: 4548 hlist_for_each_entry_rcu(pmctx, &brmctx->ip6_mc_router_list, 4549 ip6_rlist) { 4550 if (pmctx->port == port) 4551 continue; 4552 4553 ret = true; 4554 goto unlock; 4555 } 4556 break; 4557 #endif 4558 default: 4559 /* when compiled without IPv6 support, be conservative and 4560 * always assume presence of an IPv6 multicast router 4561 */ 4562 ret = true; 4563 } 4564 4565 unlock: 4566 rcu_read_unlock(); 4567 return ret; 4568 } 4569 EXPORT_SYMBOL_GPL(br_multicast_has_router_adjacent); 4570 4571 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats, 4572 const struct sk_buff *skb, u8 type, u8 dir) 4573 { 4574 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats); 4575 __be16 proto = skb->protocol; 4576 unsigned int t_len; 4577 4578 u64_stats_update_begin(&pstats->syncp); 4579 switch (proto) { 4580 case htons(ETH_P_IP): 4581 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); 4582 switch (type) { 4583 case IGMP_HOST_MEMBERSHIP_REPORT: 4584 pstats->mstats.igmp_v1reports[dir]++; 4585 break; 4586 case IGMPV2_HOST_MEMBERSHIP_REPORT: 4587 pstats->mstats.igmp_v2reports[dir]++; 4588 break; 4589 case IGMPV3_HOST_MEMBERSHIP_REPORT: 4590 pstats->mstats.igmp_v3reports[dir]++; 4591 break; 4592 case IGMP_HOST_MEMBERSHIP_QUERY: 4593 if (t_len != sizeof(struct igmphdr)) { 4594 pstats->mstats.igmp_v3queries[dir]++; 4595 } else { 4596 unsigned int offset = skb_transport_offset(skb); 4597 struct igmphdr *ih, _ihdr; 4598 4599 ih = skb_header_pointer(skb, offset, 4600 sizeof(_ihdr), &_ihdr); 4601 if (!ih) 4602 break; 4603 if (!ih->code) 4604 pstats->mstats.igmp_v1queries[dir]++; 4605 else 4606 pstats->mstats.igmp_v2queries[dir]++; 4607 } 4608 break; 4609 case IGMP_HOST_LEAVE_MESSAGE: 4610 pstats->mstats.igmp_leaves[dir]++; 4611 break; 4612 } 4613 break; 4614 #if IS_ENABLED(CONFIG_IPV6) 4615 case htons(ETH_P_IPV6): 4616 t_len = ntohs(ipv6_hdr(skb)->payload_len) + 4617 sizeof(struct ipv6hdr); 4618 t_len -= skb_network_header_len(skb); 4619 switch (type) { 4620 case ICMPV6_MGM_REPORT: 4621 pstats->mstats.mld_v1reports[dir]++; 4622 break; 4623 case ICMPV6_MLD2_REPORT: 4624 pstats->mstats.mld_v2reports[dir]++; 4625 break; 4626 case ICMPV6_MGM_QUERY: 4627 if (t_len != sizeof(struct mld_msg)) 4628 pstats->mstats.mld_v2queries[dir]++; 4629 else 4630 pstats->mstats.mld_v1queries[dir]++; 4631 break; 4632 case ICMPV6_MGM_REDUCTION: 4633 pstats->mstats.mld_leaves[dir]++; 4634 break; 4635 } 4636 break; 4637 #endif /* CONFIG_IPV6 */ 4638 } 4639 u64_stats_update_end(&pstats->syncp); 4640 } 4641 4642 void br_multicast_count(struct net_bridge *br, 4643 const struct net_bridge_port *p, 4644 const struct sk_buff *skb, u8 type, u8 dir) 4645 { 4646 struct bridge_mcast_stats __percpu *stats; 4647 4648 /* if multicast_disabled is true then igmp type can't be set */ 4649 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 4650 return; 4651 4652 if (p) 4653 stats = p->mcast_stats; 4654 else 4655 stats = br->mcast_stats; 4656 if (WARN_ON(!stats)) 4657 return; 4658 4659 br_mcast_stats_add(stats, skb, type, dir); 4660 } 4661 4662 int br_multicast_init_stats(struct net_bridge *br) 4663 { 4664 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 4665 if (!br->mcast_stats) 4666 return -ENOMEM; 4667 4668 return 0; 4669 } 4670 4671 void br_multicast_uninit_stats(struct net_bridge *br) 4672 { 4673 free_percpu(br->mcast_stats); 4674 } 4675 4676 /* noinline for https://bugs.llvm.org/show_bug.cgi?id=45802#c9 */ 4677 static noinline_for_stack void mcast_stats_add_dir(u64 *dst, u64 *src) 4678 { 4679 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX]; 4680 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX]; 4681 } 4682 4683 void br_multicast_get_stats(const struct net_bridge *br, 4684 const struct net_bridge_port *p, 4685 struct br_mcast_stats *dest) 4686 { 4687 struct bridge_mcast_stats __percpu *stats; 4688 struct br_mcast_stats tdst; 4689 int i; 4690 4691 memset(dest, 0, sizeof(*dest)); 4692 if (p) 4693 stats = p->mcast_stats; 4694 else 4695 stats = br->mcast_stats; 4696 if (WARN_ON(!stats)) 4697 return; 4698 4699 memset(&tdst, 0, sizeof(tdst)); 4700 for_each_possible_cpu(i) { 4701 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i); 4702 struct br_mcast_stats temp; 4703 unsigned int start; 4704 4705 do { 4706 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); 4707 memcpy(&temp, &cpu_stats->mstats, sizeof(temp)); 4708 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); 4709 4710 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries); 4711 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries); 4712 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries); 4713 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves); 4714 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports); 4715 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports); 4716 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports); 4717 tdst.igmp_parse_errors += temp.igmp_parse_errors; 4718 4719 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries); 4720 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries); 4721 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves); 4722 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports); 4723 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports); 4724 tdst.mld_parse_errors += temp.mld_parse_errors; 4725 } 4726 memcpy(dest, &tdst, sizeof(*dest)); 4727 } 4728 4729 int br_mdb_hash_init(struct net_bridge *br) 4730 { 4731 int err; 4732 4733 err = rhashtable_init(&br->sg_port_tbl, &br_sg_port_rht_params); 4734 if (err) 4735 return err; 4736 4737 err = rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params); 4738 if (err) { 4739 rhashtable_destroy(&br->sg_port_tbl); 4740 return err; 4741 } 4742 4743 return 0; 4744 } 4745 4746 void br_mdb_hash_fini(struct net_bridge *br) 4747 { 4748 rhashtable_destroy(&br->sg_port_tbl); 4749 rhashtable_destroy(&br->mdb_hash_tbl); 4750 } 4751