1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Bridge multicast support. 4 * 5 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> 6 */ 7 8 #include <linux/err.h> 9 #include <linux/export.h> 10 #include <linux/if_ether.h> 11 #include <linux/igmp.h> 12 #include <linux/in.h> 13 #include <linux/jhash.h> 14 #include <linux/kernel.h> 15 #include <linux/log2.h> 16 #include <linux/netdevice.h> 17 #include <linux/netfilter_bridge.h> 18 #include <linux/random.h> 19 #include <linux/rculist.h> 20 #include <linux/skbuff.h> 21 #include <linux/slab.h> 22 #include <linux/timer.h> 23 #include <linux/inetdevice.h> 24 #include <linux/mroute.h> 25 #include <net/ip.h> 26 #include <net/switchdev.h> 27 #if IS_ENABLED(CONFIG_IPV6) 28 #include <linux/icmpv6.h> 29 #include <net/ipv6.h> 30 #include <net/mld.h> 31 #include <net/ip6_checksum.h> 32 #include <net/addrconf.h> 33 #endif 34 #include <trace/events/bridge.h> 35 36 #include "br_private.h" 37 #include "br_private_mcast_eht.h" 38 39 static const struct rhashtable_params br_mdb_rht_params = { 40 .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode), 41 .key_offset = offsetof(struct net_bridge_mdb_entry, addr), 42 .key_len = sizeof(struct br_ip), 43 .automatic_shrinking = true, 44 }; 45 46 static const struct rhashtable_params br_sg_port_rht_params = { 47 .head_offset = offsetof(struct net_bridge_port_group, rhnode), 48 .key_offset = offsetof(struct net_bridge_port_group, key), 49 .key_len = sizeof(struct net_bridge_port_group_sg_key), 50 .automatic_shrinking = true, 51 }; 52 53 static void br_multicast_start_querier(struct net_bridge_mcast *brmctx, 54 struct bridge_mcast_own_query *query); 55 static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx, 56 struct net_bridge_mcast_port *pmctx); 57 static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx, 58 struct net_bridge_mcast_port *pmctx, 59 __be32 group, 60 __u16 vid, 61 const unsigned char *src); 62 static void br_multicast_port_group_rexmit(struct timer_list *t); 63 64 static void 65 br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted); 66 static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx, 67 struct net_bridge_mcast_port *pmctx); 68 #if IS_ENABLED(CONFIG_IPV6) 69 static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx, 70 struct net_bridge_mcast_port *pmctx, 71 const struct in6_addr *group, 72 __u16 vid, const unsigned char *src); 73 #endif 74 static struct net_bridge_port_group * 75 __br_multicast_add_group(struct net_bridge_mcast *brmctx, 76 struct net_bridge_mcast_port *pmctx, 77 struct br_ip *group, 78 const unsigned char *src, 79 u8 filter_mode, 80 bool igmpv2_mldv1, 81 bool blocked); 82 static void br_multicast_find_del_pg(struct net_bridge *br, 83 struct net_bridge_port_group *pg); 84 static void __br_multicast_stop(struct net_bridge_mcast *brmctx); 85 86 static int br_mc_disabled_update(struct net_device *dev, bool value, 87 struct netlink_ext_ack *extack); 88 89 static struct net_bridge_port_group * 90 br_sg_port_find(struct net_bridge *br, 91 struct net_bridge_port_group_sg_key *sg_p) 92 { 93 lockdep_assert_held_once(&br->multicast_lock); 94 95 return rhashtable_lookup_fast(&br->sg_port_tbl, sg_p, 96 br_sg_port_rht_params); 97 } 98 99 static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br, 100 struct br_ip *dst) 101 { 102 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params); 103 } 104 105 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br, 106 struct br_ip *dst) 107 { 108 struct net_bridge_mdb_entry *ent; 109 110 lockdep_assert_held_once(&br->multicast_lock); 111 112 rcu_read_lock(); 113 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params); 114 rcu_read_unlock(); 115 116 return ent; 117 } 118 119 static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br, 120 __be32 dst, __u16 vid) 121 { 122 struct br_ip br_dst; 123 124 memset(&br_dst, 0, sizeof(br_dst)); 125 br_dst.dst.ip4 = dst; 126 br_dst.proto = htons(ETH_P_IP); 127 br_dst.vid = vid; 128 129 return br_mdb_ip_get(br, &br_dst); 130 } 131 132 #if IS_ENABLED(CONFIG_IPV6) 133 static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br, 134 const struct in6_addr *dst, 135 __u16 vid) 136 { 137 struct br_ip br_dst; 138 139 memset(&br_dst, 0, sizeof(br_dst)); 140 br_dst.dst.ip6 = *dst; 141 br_dst.proto = htons(ETH_P_IPV6); 142 br_dst.vid = vid; 143 144 return br_mdb_ip_get(br, &br_dst); 145 } 146 #endif 147 148 struct net_bridge_mdb_entry * 149 br_mdb_entry_skb_get(struct net_bridge_mcast *brmctx, struct sk_buff *skb, 150 u16 vid) 151 { 152 struct net_bridge *br = brmctx->br; 153 struct br_ip ip; 154 155 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || 156 br_multicast_ctx_vlan_global_disabled(brmctx)) 157 return NULL; 158 159 if (BR_INPUT_SKB_CB(skb)->igmp) 160 return NULL; 161 162 memset(&ip, 0, sizeof(ip)); 163 ip.proto = skb->protocol; 164 ip.vid = vid; 165 166 switch (skb->protocol) { 167 case htons(ETH_P_IP): 168 ip.dst.ip4 = ip_hdr(skb)->daddr; 169 if (brmctx->multicast_igmp_version == 3) { 170 struct net_bridge_mdb_entry *mdb; 171 172 ip.src.ip4 = ip_hdr(skb)->saddr; 173 mdb = br_mdb_ip_get_rcu(br, &ip); 174 if (mdb) 175 return mdb; 176 ip.src.ip4 = 0; 177 } 178 break; 179 #if IS_ENABLED(CONFIG_IPV6) 180 case htons(ETH_P_IPV6): 181 ip.dst.ip6 = ipv6_hdr(skb)->daddr; 182 if (brmctx->multicast_mld_version == 2) { 183 struct net_bridge_mdb_entry *mdb; 184 185 ip.src.ip6 = ipv6_hdr(skb)->saddr; 186 mdb = br_mdb_ip_get_rcu(br, &ip); 187 if (mdb) 188 return mdb; 189 memset(&ip.src.ip6, 0, sizeof(ip.src.ip6)); 190 } 191 break; 192 #endif 193 default: 194 ip.proto = 0; 195 ether_addr_copy(ip.dst.mac_addr, eth_hdr(skb)->h_dest); 196 } 197 198 return br_mdb_ip_get_rcu(br, &ip); 199 } 200 201 /* IMPORTANT: this function must be used only when the contexts cannot be 202 * passed down (e.g. timer) and must be used for read-only purposes because 203 * the vlan snooping option can change, so it can return any context 204 * (non-vlan or vlan). Its initial intended purpose is to read timer values 205 * from the *current* context based on the option. At worst that could lead 206 * to inconsistent timers when the contexts are changed, i.e. src timer 207 * which needs to re-arm with a specific delay taken from the old context 208 */ 209 static struct net_bridge_mcast_port * 210 br_multicast_pg_to_port_ctx(const struct net_bridge_port_group *pg) 211 { 212 struct net_bridge_mcast_port *pmctx = &pg->key.port->multicast_ctx; 213 struct net_bridge_vlan *vlan; 214 215 lockdep_assert_held_once(&pg->key.port->br->multicast_lock); 216 217 /* if vlan snooping is disabled use the port's multicast context */ 218 if (!pg->key.addr.vid || 219 !br_opt_get(pg->key.port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) 220 goto out; 221 222 /* locking is tricky here, due to different rules for multicast and 223 * vlans we need to take rcu to find the vlan and make sure it has 224 * the BR_VLFLAG_MCAST_ENABLED flag set, it can only change under 225 * multicast_lock which must be already held here, so the vlan's pmctx 226 * can safely be used on return 227 */ 228 rcu_read_lock(); 229 vlan = br_vlan_find(nbp_vlan_group_rcu(pg->key.port), pg->key.addr.vid); 230 if (vlan && !br_multicast_port_ctx_vlan_disabled(&vlan->port_mcast_ctx)) 231 pmctx = &vlan->port_mcast_ctx; 232 else 233 pmctx = NULL; 234 rcu_read_unlock(); 235 out: 236 return pmctx; 237 } 238 239 static struct net_bridge_mcast_port * 240 br_multicast_port_vid_to_port_ctx(struct net_bridge_port *port, u16 vid) 241 { 242 struct net_bridge_mcast_port *pmctx = NULL; 243 struct net_bridge_vlan *vlan; 244 245 lockdep_assert_held_once(&port->br->multicast_lock); 246 247 /* Take RCU to access the vlan. */ 248 rcu_read_lock(); 249 250 vlan = br_vlan_find(nbp_vlan_group_rcu(port), vid); 251 if (vlan) 252 pmctx = &vlan->port_mcast_ctx; 253 254 rcu_read_unlock(); 255 256 return pmctx; 257 } 258 259 /* when snooping we need to check if the contexts should be used 260 * in the following order: 261 * - if pmctx is non-NULL (port), check if it should be used 262 * - if pmctx is NULL (bridge), check if brmctx should be used 263 */ 264 static bool 265 br_multicast_ctx_should_use(const struct net_bridge_mcast *brmctx, 266 const struct net_bridge_mcast_port *pmctx) 267 { 268 if (!netif_running(brmctx->br->dev)) 269 return false; 270 271 if (pmctx) 272 return !br_multicast_port_ctx_state_disabled(pmctx); 273 else 274 return !br_multicast_ctx_vlan_disabled(brmctx); 275 } 276 277 static bool br_port_group_equal(struct net_bridge_port_group *p, 278 struct net_bridge_port *port, 279 const unsigned char *src) 280 { 281 if (p->key.port != port) 282 return false; 283 284 if (!test_bit(BR_MULTICAST_TO_UNICAST_BIT, &port->flags)) 285 return true; 286 287 return ether_addr_equal(src, p->eth_addr); 288 } 289 290 static void __fwd_add_star_excl(struct net_bridge_mcast_port *pmctx, 291 struct net_bridge_port_group *pg, 292 struct br_ip *sg_ip) 293 { 294 struct net_bridge_port_group_sg_key sg_key; 295 struct net_bridge_port_group *src_pg; 296 struct net_bridge_mcast *brmctx; 297 298 memset(&sg_key, 0, sizeof(sg_key)); 299 brmctx = br_multicast_port_ctx_get_global(pmctx); 300 sg_key.port = pg->key.port; 301 sg_key.addr = *sg_ip; 302 if (br_sg_port_find(brmctx->br, &sg_key)) 303 return; 304 305 src_pg = __br_multicast_add_group(brmctx, pmctx, 306 sg_ip, pg->eth_addr, 307 MCAST_INCLUDE, false, false); 308 if (IS_ERR_OR_NULL(src_pg) || 309 src_pg->rt_protocol != RTPROT_KERNEL) 310 return; 311 312 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL; 313 } 314 315 static void __fwd_del_star_excl(struct net_bridge_port_group *pg, 316 struct br_ip *sg_ip) 317 { 318 struct net_bridge_port_group_sg_key sg_key; 319 struct net_bridge *br = pg->key.port->br; 320 struct net_bridge_port_group *src_pg; 321 322 memset(&sg_key, 0, sizeof(sg_key)); 323 sg_key.port = pg->key.port; 324 sg_key.addr = *sg_ip; 325 src_pg = br_sg_port_find(br, &sg_key); 326 if (!src_pg || !(src_pg->flags & MDB_PG_FLAGS_STAR_EXCL) || 327 src_pg->rt_protocol != RTPROT_KERNEL) 328 return; 329 330 br_multicast_find_del_pg(br, src_pg); 331 } 332 333 /* When a port group transitions to (or is added as) EXCLUDE we need to add it 334 * to all other ports' S,G entries which are not blocked by the current group 335 * for proper replication, the assumption is that any S,G blocked entries 336 * are already added so the S,G,port lookup should skip them. 337 * When a port group transitions from EXCLUDE -> INCLUDE mode or is being 338 * deleted we need to remove it from all ports' S,G entries where it was 339 * automatically installed before (i.e. where it's MDB_PG_FLAGS_STAR_EXCL). 340 */ 341 void br_multicast_star_g_handle_mode(struct net_bridge_port_group *pg, 342 u8 filter_mode) 343 { 344 struct net_bridge *br = pg->key.port->br; 345 struct net_bridge_port_group *pg_lst; 346 struct net_bridge_mcast_port *pmctx; 347 struct net_bridge_mdb_entry *mp; 348 struct br_ip sg_ip; 349 350 if (WARN_ON(!br_multicast_is_star_g(&pg->key.addr))) 351 return; 352 353 mp = br_mdb_ip_get(br, &pg->key.addr); 354 if (!mp) 355 return; 356 pmctx = br_multicast_pg_to_port_ctx(pg); 357 if (!pmctx) 358 return; 359 360 memset(&sg_ip, 0, sizeof(sg_ip)); 361 sg_ip = pg->key.addr; 362 363 for (pg_lst = mlock_dereference(mp->ports, br); 364 pg_lst; 365 pg_lst = mlock_dereference(pg_lst->next, br)) { 366 struct net_bridge_group_src *src_ent; 367 368 if (pg_lst == pg) 369 continue; 370 hlist_for_each_entry(src_ent, &pg_lst->src_list, node) { 371 if (!(src_ent->flags & BR_SGRP_F_INSTALLED)) 372 continue; 373 sg_ip.src = src_ent->addr.src; 374 switch (filter_mode) { 375 case MCAST_INCLUDE: 376 __fwd_del_star_excl(pg, &sg_ip); 377 break; 378 case MCAST_EXCLUDE: 379 __fwd_add_star_excl(pmctx, pg, &sg_ip); 380 break; 381 } 382 } 383 } 384 } 385 386 /* called when adding a new S,G with host_joined == false by default */ 387 static void br_multicast_sg_host_state(struct net_bridge_mdb_entry *star_mp, 388 struct net_bridge_port_group *sg) 389 { 390 struct net_bridge_mdb_entry *sg_mp; 391 392 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr))) 393 return; 394 if (!star_mp->host_joined) 395 return; 396 397 sg_mp = br_mdb_ip_get(star_mp->br, &sg->key.addr); 398 if (!sg_mp) 399 return; 400 sg_mp->host_joined = true; 401 } 402 403 /* set the host_joined state of all of *,G's S,G entries */ 404 static void br_multicast_star_g_host_state(struct net_bridge_mdb_entry *star_mp) 405 { 406 struct net_bridge *br = star_mp->br; 407 struct net_bridge_mdb_entry *sg_mp; 408 struct net_bridge_port_group *pg; 409 struct br_ip sg_ip; 410 411 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr))) 412 return; 413 414 memset(&sg_ip, 0, sizeof(sg_ip)); 415 sg_ip = star_mp->addr; 416 for (pg = mlock_dereference(star_mp->ports, br); 417 pg; 418 pg = mlock_dereference(pg->next, br)) { 419 struct net_bridge_group_src *src_ent; 420 421 hlist_for_each_entry(src_ent, &pg->src_list, node) { 422 if (!(src_ent->flags & BR_SGRP_F_INSTALLED)) 423 continue; 424 sg_ip.src = src_ent->addr.src; 425 sg_mp = br_mdb_ip_get(br, &sg_ip); 426 if (!sg_mp) 427 continue; 428 sg_mp->host_joined = star_mp->host_joined; 429 } 430 } 431 } 432 433 static void br_multicast_sg_del_exclude_ports(struct net_bridge_mdb_entry *sgmp) 434 { 435 struct net_bridge_port_group __rcu **pp; 436 struct net_bridge_port_group *p; 437 438 /* *,G exclude ports are only added to S,G entries */ 439 if (WARN_ON(br_multicast_is_star_g(&sgmp->addr))) 440 return; 441 442 /* we need the STAR_EXCLUDE ports if there are non-STAR_EXCLUDE ports 443 * we should ignore perm entries since they're managed by user-space 444 */ 445 for (pp = &sgmp->ports; 446 (p = mlock_dereference(*pp, sgmp->br)) != NULL; 447 pp = &p->next) 448 if (!(p->flags & (MDB_PG_FLAGS_STAR_EXCL | 449 MDB_PG_FLAGS_PERMANENT))) 450 return; 451 452 /* currently the host can only have joined the *,G which means 453 * we treat it as EXCLUDE {}, so for an S,G it's considered a 454 * STAR_EXCLUDE entry and we can safely leave it 455 */ 456 sgmp->host_joined = false; 457 458 for (pp = &sgmp->ports; 459 (p = mlock_dereference(*pp, sgmp->br)) != NULL;) { 460 if (!(p->flags & MDB_PG_FLAGS_PERMANENT)) 461 br_multicast_del_pg(sgmp, p, pp); 462 else 463 pp = &p->next; 464 } 465 } 466 467 void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp, 468 struct net_bridge_port_group *sg) 469 { 470 struct net_bridge_port_group_sg_key sg_key; 471 struct net_bridge *br = star_mp->br; 472 struct net_bridge_mcast_port *pmctx; 473 struct net_bridge_port_group *pg; 474 struct net_bridge_mcast *brmctx; 475 476 if (WARN_ON(br_multicast_is_star_g(&sg->key.addr))) 477 return; 478 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr))) 479 return; 480 481 br_multicast_sg_host_state(star_mp, sg); 482 memset(&sg_key, 0, sizeof(sg_key)); 483 sg_key.addr = sg->key.addr; 484 /* we need to add all exclude ports to the S,G */ 485 for (pg = mlock_dereference(star_mp->ports, br); 486 pg; 487 pg = mlock_dereference(pg->next, br)) { 488 struct net_bridge_port_group *src_pg; 489 490 if (pg == sg || pg->filter_mode == MCAST_INCLUDE) 491 continue; 492 493 sg_key.port = pg->key.port; 494 if (br_sg_port_find(br, &sg_key)) 495 continue; 496 497 pmctx = br_multicast_pg_to_port_ctx(pg); 498 if (!pmctx) 499 continue; 500 brmctx = br_multicast_port_ctx_get_global(pmctx); 501 502 src_pg = __br_multicast_add_group(brmctx, pmctx, 503 &sg->key.addr, 504 sg->eth_addr, 505 MCAST_INCLUDE, false, false); 506 if (IS_ERR_OR_NULL(src_pg) || 507 src_pg->rt_protocol != RTPROT_KERNEL) 508 continue; 509 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL; 510 } 511 } 512 513 static void br_multicast_fwd_src_add(struct net_bridge_group_src *src) 514 { 515 struct net_bridge_mdb_entry *star_mp; 516 struct net_bridge_mcast_port *pmctx; 517 struct net_bridge_port_group *sg; 518 struct net_bridge_mcast *brmctx; 519 struct br_ip sg_ip; 520 521 if (src->flags & BR_SGRP_F_INSTALLED) 522 return; 523 524 memset(&sg_ip, 0, sizeof(sg_ip)); 525 pmctx = br_multicast_pg_to_port_ctx(src->pg); 526 if (!pmctx) 527 return; 528 brmctx = br_multicast_port_ctx_get_global(pmctx); 529 sg_ip = src->pg->key.addr; 530 sg_ip.src = src->addr.src; 531 532 sg = __br_multicast_add_group(brmctx, pmctx, &sg_ip, 533 src->pg->eth_addr, MCAST_INCLUDE, false, 534 !timer_pending(&src->timer)); 535 if (IS_ERR_OR_NULL(sg)) 536 return; 537 src->flags |= BR_SGRP_F_INSTALLED; 538 sg->flags &= ~MDB_PG_FLAGS_STAR_EXCL; 539 540 /* if it was added by user-space as perm we can skip next steps */ 541 if (sg->rt_protocol != RTPROT_KERNEL && 542 (sg->flags & MDB_PG_FLAGS_PERMANENT)) 543 return; 544 545 /* the kernel is now responsible for removing this S,G */ 546 timer_delete(&sg->timer); 547 star_mp = br_mdb_ip_get(src->br, &src->pg->key.addr); 548 if (!star_mp) 549 return; 550 551 br_multicast_sg_add_exclude_ports(star_mp, sg); 552 } 553 554 static void br_multicast_fwd_src_remove(struct net_bridge_group_src *src, 555 bool fastleave) 556 { 557 struct net_bridge_port_group *p, *pg = src->pg; 558 struct net_bridge_port_group __rcu **pp; 559 struct net_bridge_mdb_entry *mp; 560 struct br_ip sg_ip; 561 562 memset(&sg_ip, 0, sizeof(sg_ip)); 563 sg_ip = pg->key.addr; 564 sg_ip.src = src->addr.src; 565 566 mp = br_mdb_ip_get(src->br, &sg_ip); 567 if (!mp) 568 return; 569 570 for (pp = &mp->ports; 571 (p = mlock_dereference(*pp, src->br)) != NULL; 572 pp = &p->next) { 573 if (!br_port_group_equal(p, pg->key.port, pg->eth_addr)) 574 continue; 575 576 if (p->rt_protocol != RTPROT_KERNEL && 577 (p->flags & MDB_PG_FLAGS_PERMANENT) && 578 !(src->flags & BR_SGRP_F_USER_ADDED)) 579 break; 580 581 if (fastleave) 582 p->flags |= MDB_PG_FLAGS_FAST_LEAVE; 583 br_multicast_del_pg(mp, p, pp); 584 break; 585 } 586 src->flags &= ~BR_SGRP_F_INSTALLED; 587 } 588 589 /* install S,G and based on src's timer enable or disable forwarding */ 590 static void br_multicast_fwd_src_handle(struct net_bridge_group_src *src) 591 { 592 struct net_bridge_port_group_sg_key sg_key; 593 struct net_bridge_port_group *sg; 594 u8 old_flags; 595 596 br_multicast_fwd_src_add(src); 597 598 memset(&sg_key, 0, sizeof(sg_key)); 599 sg_key.addr = src->pg->key.addr; 600 sg_key.addr.src = src->addr.src; 601 sg_key.port = src->pg->key.port; 602 603 sg = br_sg_port_find(src->br, &sg_key); 604 if (!sg || (sg->flags & MDB_PG_FLAGS_PERMANENT)) 605 return; 606 607 old_flags = sg->flags; 608 if (timer_pending(&src->timer)) 609 sg->flags &= ~MDB_PG_FLAGS_BLOCKED; 610 else 611 sg->flags |= MDB_PG_FLAGS_BLOCKED; 612 613 if (old_flags != sg->flags) { 614 struct net_bridge_mdb_entry *sg_mp; 615 616 sg_mp = br_mdb_ip_get(src->br, &sg_key.addr); 617 if (!sg_mp) 618 return; 619 br_mdb_notify(src->br->dev, sg_mp, sg, RTM_NEWMDB); 620 } 621 } 622 623 static void br_multicast_destroy_mdb_entry(struct net_bridge_mcast_gc *gc) 624 { 625 struct net_bridge_mdb_entry *mp; 626 627 mp = container_of(gc, struct net_bridge_mdb_entry, mcast_gc); 628 WARN_ON(!hlist_unhashed(&mp->mdb_node)); 629 WARN_ON(mp->ports); 630 631 timer_shutdown_sync(&mp->timer); 632 kfree_rcu(mp, rcu); 633 } 634 635 static void br_multicast_del_mdb_entry(struct net_bridge_mdb_entry *mp) 636 { 637 struct net_bridge *br = mp->br; 638 639 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode, 640 br_mdb_rht_params); 641 hlist_del_init_rcu(&mp->mdb_node); 642 hlist_add_head(&mp->mcast_gc.gc_node, &br->mcast_gc_list); 643 queue_work(system_long_wq, &br->mcast_gc_work); 644 } 645 646 static void br_multicast_group_expired(struct timer_list *t) 647 { 648 struct net_bridge_mdb_entry *mp = timer_container_of(mp, t, timer); 649 struct net_bridge *br = mp->br; 650 651 spin_lock(&br->multicast_lock); 652 if (hlist_unhashed(&mp->mdb_node) || !netif_running(br->dev) || 653 timer_pending(&mp->timer)) 654 goto out; 655 656 br_multicast_host_leave(mp, true); 657 658 if (mp->ports) 659 goto out; 660 br_multicast_del_mdb_entry(mp); 661 out: 662 spin_unlock(&br->multicast_lock); 663 } 664 665 static void br_multicast_destroy_group_src(struct net_bridge_mcast_gc *gc) 666 { 667 struct net_bridge_group_src *src; 668 669 src = container_of(gc, struct net_bridge_group_src, mcast_gc); 670 WARN_ON(!hlist_unhashed(&src->node)); 671 672 timer_shutdown_sync(&src->timer); 673 kfree_rcu(src, rcu); 674 } 675 676 void __br_multicast_del_group_src(struct net_bridge_group_src *src) 677 { 678 struct net_bridge *br = src->pg->key.port->br; 679 680 hlist_del_init_rcu(&src->node); 681 src->pg->src_ents--; 682 hlist_add_head(&src->mcast_gc.gc_node, &br->mcast_gc_list); 683 queue_work(system_long_wq, &br->mcast_gc_work); 684 } 685 686 void br_multicast_del_group_src(struct net_bridge_group_src *src, 687 bool fastleave) 688 { 689 br_multicast_fwd_src_remove(src, fastleave); 690 __br_multicast_del_group_src(src); 691 } 692 693 static int 694 br_multicast_port_ngroups_inc_one(struct net_bridge_mcast_port *pmctx, 695 struct netlink_ext_ack *extack, 696 const char *what) 697 { 698 u32 max = READ_ONCE(pmctx->mdb_max_entries); 699 u32 n = READ_ONCE(pmctx->mdb_n_entries); 700 701 /* enforce the max limit when it's a port pmctx or a port-vlan pmctx 702 * with snooping enabled 703 */ 704 if (!br_multicast_port_ctx_vlan_disabled(pmctx) && max && n >= max) { 705 NL_SET_ERR_MSG_FMT_MOD(extack, "%s is already in %u groups, and mcast_max_groups=%u", 706 what, n, max); 707 return -E2BIG; 708 } 709 710 WRITE_ONCE(pmctx->mdb_n_entries, n + 1); 711 return 0; 712 } 713 714 static void br_multicast_port_ngroups_dec_one(struct net_bridge_mcast_port *pmctx) 715 { 716 u32 n = READ_ONCE(pmctx->mdb_n_entries); 717 718 WARN_ON_ONCE(n == 0); 719 WRITE_ONCE(pmctx->mdb_n_entries, n - 1); 720 } 721 722 static int br_multicast_port_ngroups_inc(struct net_bridge_port *port, 723 const struct br_ip *group, 724 struct netlink_ext_ack *extack) 725 { 726 struct net_bridge_mcast_port *pmctx; 727 int err; 728 729 lockdep_assert_held_once(&port->br->multicast_lock); 730 731 /* Always count on the port context. */ 732 err = br_multicast_port_ngroups_inc_one(&port->multicast_ctx, extack, 733 "Port"); 734 if (err) { 735 trace_br_mdb_full(port->dev, group); 736 return err; 737 } 738 739 /* Only count on the VLAN context if VID is given */ 740 if (!group->vid) 741 return 0; 742 743 pmctx = br_multicast_port_vid_to_port_ctx(port, group->vid); 744 if (!pmctx) 745 return 0; 746 747 err = br_multicast_port_ngroups_inc_one(pmctx, extack, "Port-VLAN"); 748 if (err) { 749 trace_br_mdb_full(port->dev, group); 750 goto dec_one_out; 751 } 752 753 return 0; 754 755 dec_one_out: 756 br_multicast_port_ngroups_dec_one(&port->multicast_ctx); 757 return err; 758 } 759 760 static void br_multicast_port_ngroups_dec(struct net_bridge_port *port, u16 vid) 761 { 762 struct net_bridge_mcast_port *pmctx; 763 764 lockdep_assert_held_once(&port->br->multicast_lock); 765 766 if (vid) { 767 pmctx = br_multicast_port_vid_to_port_ctx(port, vid); 768 if (pmctx) 769 br_multicast_port_ngroups_dec_one(pmctx); 770 } 771 br_multicast_port_ngroups_dec_one(&port->multicast_ctx); 772 } 773 774 u32 br_multicast_ngroups_get(const struct net_bridge_mcast_port *pmctx) 775 { 776 return READ_ONCE(pmctx->mdb_n_entries); 777 } 778 779 void br_multicast_ngroups_set_max(struct net_bridge_mcast_port *pmctx, u32 max) 780 { 781 WRITE_ONCE(pmctx->mdb_max_entries, max); 782 } 783 784 u32 br_multicast_ngroups_get_max(const struct net_bridge_mcast_port *pmctx) 785 { 786 return READ_ONCE(pmctx->mdb_max_entries); 787 } 788 789 static void br_multicast_destroy_port_group(struct net_bridge_mcast_gc *gc) 790 { 791 struct net_bridge_port_group *pg; 792 793 pg = container_of(gc, struct net_bridge_port_group, mcast_gc); 794 WARN_ON(!hlist_unhashed(&pg->mglist)); 795 WARN_ON(!hlist_empty(&pg->src_list)); 796 797 timer_shutdown_sync(&pg->rexmit_timer); 798 timer_shutdown_sync(&pg->timer); 799 kfree_rcu(pg, rcu); 800 } 801 802 void br_multicast_del_pg(struct net_bridge_mdb_entry *mp, 803 struct net_bridge_port_group *pg, 804 struct net_bridge_port_group __rcu **pp) 805 { 806 struct net_bridge *br = pg->key.port->br; 807 struct net_bridge_group_src *ent; 808 struct hlist_node *tmp; 809 810 rcu_assign_pointer(*pp, pg->next); 811 /* Keep ->next (held under multicast_lock, freed later by the GC work): 812 * a port->mglist teardown walk may have latched this node as its next, 813 * and deleting other groups of the same port must not truncate it. 814 */ 815 hlist_del_init_rcu(&pg->mglist); 816 br_multicast_eht_clean_sets(pg); 817 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) 818 br_multicast_del_group_src(ent, false); 819 br_mdb_notify(br->dev, mp, pg, RTM_DELMDB); 820 if (!br_multicast_is_star_g(&mp->addr)) { 821 rhashtable_remove_fast(&br->sg_port_tbl, &pg->rhnode, 822 br_sg_port_rht_params); 823 br_multicast_sg_del_exclude_ports(mp); 824 } else { 825 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE); 826 } 827 br_multicast_port_ngroups_dec(pg->key.port, pg->key.addr.vid); 828 hlist_add_head(&pg->mcast_gc.gc_node, &br->mcast_gc_list); 829 queue_work(system_long_wq, &br->mcast_gc_work); 830 831 if (!mp->ports && !mp->host_joined && netif_running(br->dev)) 832 mod_timer(&mp->timer, jiffies); 833 } 834 835 static void br_multicast_find_del_pg(struct net_bridge *br, 836 struct net_bridge_port_group *pg) 837 { 838 struct net_bridge_port_group __rcu **pp; 839 struct net_bridge_mdb_entry *mp; 840 struct net_bridge_port_group *p; 841 842 /* A teardown walk over port->mglist can reach a group that an earlier 843 * iteration already deleted as a side effect. It is off mp->ports by 844 * now, so skip it instead of falling through to the WARN_ON() below. 845 */ 846 if (hlist_unhashed(&pg->mglist)) 847 return; 848 849 mp = br_mdb_ip_get(br, &pg->key.addr); 850 if (WARN_ON(!mp)) 851 return; 852 853 for (pp = &mp->ports; 854 (p = mlock_dereference(*pp, br)) != NULL; 855 pp = &p->next) { 856 if (p != pg) 857 continue; 858 859 br_multicast_del_pg(mp, pg, pp); 860 return; 861 } 862 863 WARN_ON(1); 864 } 865 866 static void br_multicast_port_group_expired(struct timer_list *t) 867 { 868 struct net_bridge_port_group *pg = timer_container_of(pg, t, timer); 869 struct net_bridge_group_src *src_ent; 870 struct net_bridge *br = pg->key.port->br; 871 struct hlist_node *tmp; 872 bool changed; 873 874 spin_lock(&br->multicast_lock); 875 if (!netif_running(br->dev) || timer_pending(&pg->timer) || 876 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT) 877 goto out; 878 879 changed = !!(pg->filter_mode == MCAST_EXCLUDE); 880 pg->filter_mode = MCAST_INCLUDE; 881 hlist_for_each_entry_safe(src_ent, tmp, &pg->src_list, node) { 882 if (!timer_pending(&src_ent->timer)) { 883 br_multicast_del_group_src(src_ent, false); 884 changed = true; 885 } 886 } 887 888 if (hlist_empty(&pg->src_list)) { 889 br_multicast_find_del_pg(br, pg); 890 } else if (changed) { 891 struct net_bridge_mdb_entry *mp = br_mdb_ip_get(br, &pg->key.addr); 892 893 if (changed && br_multicast_is_star_g(&pg->key.addr)) 894 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE); 895 896 if (WARN_ON(!mp)) 897 goto out; 898 br_mdb_notify(br->dev, mp, pg, RTM_NEWMDB); 899 } 900 out: 901 spin_unlock(&br->multicast_lock); 902 } 903 904 static void br_multicast_gc(struct hlist_head *head) 905 { 906 struct net_bridge_mcast_gc *gcent; 907 struct hlist_node *tmp; 908 909 hlist_for_each_entry_safe(gcent, tmp, head, gc_node) { 910 hlist_del_init(&gcent->gc_node); 911 gcent->destroy(gcent); 912 } 913 } 914 915 static void __br_multicast_query_handle_vlan(struct net_bridge_mcast *brmctx, 916 struct net_bridge_mcast_port *pmctx, 917 struct sk_buff *skb) 918 { 919 struct net_bridge_vlan *vlan = NULL; 920 921 if (pmctx && br_multicast_port_ctx_is_vlan(pmctx)) 922 vlan = pmctx->vlan; 923 else if (br_multicast_ctx_is_vlan(brmctx)) 924 vlan = brmctx->vlan; 925 926 if (vlan && !(vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED)) { 927 u16 vlan_proto; 928 929 if (br_vlan_get_proto(brmctx->br->dev, &vlan_proto) != 0) 930 return; 931 __vlan_hwaccel_put_tag(skb, htons(vlan_proto), vlan->vid); 932 } 933 } 934 935 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge_mcast *brmctx, 936 struct net_bridge_mcast_port *pmctx, 937 struct net_bridge_port_group *pg, 938 __be32 ip_dst, __be32 group, 939 bool with_srcs, bool over_lmqt, 940 u8 sflag, 941 bool *need_rexmit) 942 { 943 struct net_bridge_port *p = pg ? pg->key.port : NULL; 944 struct net_bridge_group_src *ent; 945 size_t pkt_size, igmp_hdr_size; 946 unsigned long now = jiffies; 947 struct igmpv3_query *ihv3; 948 unsigned long lmqt, mrt; 949 void *csum_start = NULL; 950 __sum16 *csum = NULL; 951 struct sk_buff *skb; 952 struct igmphdr *ih; 953 struct ethhdr *eth; 954 struct iphdr *iph; 955 u16 lmqt_srcs = 0; 956 957 igmp_hdr_size = sizeof(*ih); 958 if (brmctx->multicast_igmp_version == 3) { 959 igmp_hdr_size = sizeof(*ihv3); 960 if (pg && with_srcs) { 961 lmqt = now + (brmctx->multicast_last_member_interval * 962 brmctx->multicast_last_member_count); 963 hlist_for_each_entry(ent, &pg->src_list, node) { 964 if (over_lmqt == time_after(ent->timer.expires, 965 lmqt) && 966 ent->src_query_rexmit_cnt > 0) 967 lmqt_srcs++; 968 } 969 970 if (!lmqt_srcs) 971 return NULL; 972 igmp_hdr_size += lmqt_srcs * sizeof(__be32); 973 } 974 } 975 976 pkt_size = sizeof(*eth) + sizeof(*iph) + 4 + igmp_hdr_size; 977 if ((p && pkt_size > p->dev->mtu) || 978 pkt_size > brmctx->br->dev->mtu) 979 return NULL; 980 981 skb = netdev_alloc_skb_ip_align(brmctx->br->dev, pkt_size); 982 if (!skb) 983 goto out; 984 985 __br_multicast_query_handle_vlan(brmctx, pmctx, skb); 986 skb->protocol = htons(ETH_P_IP); 987 988 skb_reset_mac_header(skb); 989 eth = eth_hdr(skb); 990 991 ether_addr_copy(eth->h_source, brmctx->br->dev->dev_addr); 992 ip_eth_mc_map(ip_dst, eth->h_dest); 993 eth->h_proto = htons(ETH_P_IP); 994 skb_put(skb, sizeof(*eth)); 995 996 skb_set_network_header(skb, skb->len); 997 iph = ip_hdr(skb); 998 iph->tot_len = htons(pkt_size - sizeof(*eth)); 999 1000 iph->version = 4; 1001 iph->ihl = 6; 1002 iph->tos = 0xc0; 1003 iph->id = 0; 1004 iph->frag_off = htons(IP_DF); 1005 iph->ttl = 1; 1006 iph->protocol = IPPROTO_IGMP; 1007 iph->saddr = br_opt_get(brmctx->br, BROPT_MULTICAST_QUERY_USE_IFADDR) ? 1008 inet_select_addr(brmctx->br->dev, 0, RT_SCOPE_LINK) : 0; 1009 iph->daddr = ip_dst; 1010 ((u8 *)&iph[1])[0] = IPOPT_RA; 1011 ((u8 *)&iph[1])[1] = 4; 1012 ((u8 *)&iph[1])[2] = 0; 1013 ((u8 *)&iph[1])[3] = 0; 1014 ip_send_check(iph); 1015 skb_put(skb, 24); 1016 1017 skb_set_transport_header(skb, skb->len); 1018 mrt = group ? brmctx->multicast_last_member_interval : 1019 brmctx->multicast_query_response_interval; 1020 1021 switch (brmctx->multicast_igmp_version) { 1022 case 2: 1023 ih = igmp_hdr(skb); 1024 ih->type = IGMP_HOST_MEMBERSHIP_QUERY; 1025 ih->code = mrt / (HZ / IGMP_TIMER_SCALE); 1026 ih->group = group; 1027 ih->csum = 0; 1028 csum = &ih->csum; 1029 csum_start = (void *)ih; 1030 break; 1031 case 3: 1032 ihv3 = igmpv3_query_hdr(skb); 1033 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY; 1034 ihv3->code = igmpv3_mrc(mrt / (HZ / IGMP_TIMER_SCALE)); 1035 ihv3->group = group; 1036 ihv3->qqic = igmpv3_qqic(brmctx->multicast_query_interval / HZ); 1037 ihv3->nsrcs = htons(lmqt_srcs); 1038 ihv3->resv = 0; 1039 ihv3->suppress = sflag; 1040 ihv3->qrv = 2; 1041 ihv3->csum = 0; 1042 csum = &ihv3->csum; 1043 csum_start = (void *)ihv3; 1044 if (!pg || !with_srcs) 1045 break; 1046 1047 lmqt_srcs = 0; 1048 hlist_for_each_entry(ent, &pg->src_list, node) { 1049 if (over_lmqt == time_after(ent->timer.expires, 1050 lmqt) && 1051 ent->src_query_rexmit_cnt > 0) { 1052 ihv3->srcs[lmqt_srcs++] = ent->addr.src.ip4; 1053 ent->src_query_rexmit_cnt--; 1054 if (need_rexmit && ent->src_query_rexmit_cnt) 1055 *need_rexmit = true; 1056 } 1057 } 1058 if (WARN_ON(lmqt_srcs != ntohs(ihv3->nsrcs))) { 1059 kfree_skb(skb); 1060 return NULL; 1061 } 1062 break; 1063 } 1064 1065 if (WARN_ON(!csum || !csum_start)) { 1066 kfree_skb(skb); 1067 return NULL; 1068 } 1069 1070 *csum = ip_compute_csum(csum_start, igmp_hdr_size); 1071 skb_put(skb, igmp_hdr_size); 1072 __skb_pull(skb, sizeof(*eth)); 1073 1074 out: 1075 return skb; 1076 } 1077 1078 #if IS_ENABLED(CONFIG_IPV6) 1079 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge_mcast *brmctx, 1080 struct net_bridge_mcast_port *pmctx, 1081 struct net_bridge_port_group *pg, 1082 const struct in6_addr *ip6_dst, 1083 const struct in6_addr *group, 1084 bool with_srcs, bool over_llqt, 1085 u8 sflag, 1086 bool *need_rexmit) 1087 { 1088 struct net_bridge_port *p = pg ? pg->key.port : NULL; 1089 struct net_bridge_group_src *ent; 1090 size_t pkt_size, mld_hdr_size; 1091 unsigned long now = jiffies; 1092 struct mld2_query *mld2q; 1093 void *csum_start = NULL; 1094 unsigned long interval; 1095 __sum16 *csum = NULL; 1096 struct ipv6hdr *ip6h; 1097 struct mld_msg *mldq; 1098 struct sk_buff *skb; 1099 unsigned long llqt; 1100 struct ethhdr *eth; 1101 u16 llqt_srcs = 0; 1102 u8 *hopopt; 1103 1104 mld_hdr_size = sizeof(*mldq); 1105 if (brmctx->multicast_mld_version == 2) { 1106 mld_hdr_size = sizeof(*mld2q); 1107 if (pg && with_srcs) { 1108 llqt = now + (brmctx->multicast_last_member_interval * 1109 brmctx->multicast_last_member_count); 1110 hlist_for_each_entry(ent, &pg->src_list, node) { 1111 if (over_llqt == time_after(ent->timer.expires, 1112 llqt) && 1113 ent->src_query_rexmit_cnt > 0) 1114 llqt_srcs++; 1115 } 1116 1117 if (!llqt_srcs) 1118 return NULL; 1119 mld_hdr_size += llqt_srcs * sizeof(struct in6_addr); 1120 } 1121 } 1122 1123 pkt_size = sizeof(*eth) + sizeof(*ip6h) + 8 + mld_hdr_size; 1124 if ((p && pkt_size > p->dev->mtu) || 1125 pkt_size > brmctx->br->dev->mtu) 1126 return NULL; 1127 1128 skb = netdev_alloc_skb_ip_align(brmctx->br->dev, pkt_size); 1129 if (!skb) 1130 goto out; 1131 1132 __br_multicast_query_handle_vlan(brmctx, pmctx, skb); 1133 skb->protocol = htons(ETH_P_IPV6); 1134 1135 /* Ethernet header */ 1136 skb_reset_mac_header(skb); 1137 eth = eth_hdr(skb); 1138 1139 ether_addr_copy(eth->h_source, brmctx->br->dev->dev_addr); 1140 eth->h_proto = htons(ETH_P_IPV6); 1141 skb_put(skb, sizeof(*eth)); 1142 1143 /* IPv6 header + HbH option */ 1144 skb_set_network_header(skb, skb->len); 1145 ip6h = ipv6_hdr(skb); 1146 1147 *(__force __be32 *)ip6h = htonl(0x60000000); 1148 ip6h->payload_len = htons(8 + mld_hdr_size); 1149 ip6h->nexthdr = IPPROTO_HOPOPTS; 1150 ip6h->hop_limit = 1; 1151 ip6h->daddr = *ip6_dst; 1152 if (ipv6_dev_get_saddr(dev_net(brmctx->br->dev), brmctx->br->dev, 1153 &ip6h->daddr, 0, &ip6h->saddr)) { 1154 kfree_skb(skb); 1155 br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, false); 1156 return NULL; 1157 } 1158 1159 br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, true); 1160 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 1161 1162 hopopt = (u8 *)(ip6h + 1); 1163 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ 1164 hopopt[1] = 0; /* length of HbH */ 1165 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ 1166 hopopt[3] = 2; /* Length of RA Option */ 1167 hopopt[4] = 0; /* Type = 0x0000 (MLD) */ 1168 hopopt[5] = 0; 1169 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ 1170 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ 1171 1172 skb_put(skb, sizeof(*ip6h) + 8); 1173 1174 /* ICMPv6 */ 1175 skb_set_transport_header(skb, skb->len); 1176 interval = ipv6_addr_any(group) ? 1177 brmctx->multicast_query_response_interval : 1178 brmctx->multicast_last_member_interval; 1179 switch (brmctx->multicast_mld_version) { 1180 case 1: 1181 mldq = (struct mld_msg *)icmp6_hdr(skb); 1182 mldq->mld_type = ICMPV6_MGM_QUERY; 1183 mldq->mld_code = 0; 1184 mldq->mld_cksum = 0; 1185 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); 1186 mldq->mld_reserved = 0; 1187 mldq->mld_mca = *group; 1188 csum = &mldq->mld_cksum; 1189 csum_start = (void *)mldq; 1190 break; 1191 case 2: 1192 mld2q = (struct mld2_query *)icmp6_hdr(skb); 1193 mld2q->mld2q_mrc = htons(mldv2_mrc(jiffies_to_msecs(interval))); 1194 mld2q->mld2q_type = ICMPV6_MGM_QUERY; 1195 mld2q->mld2q_code = 0; 1196 mld2q->mld2q_cksum = 0; 1197 mld2q->mld2q_resv1 = 0; 1198 mld2q->mld2q_resv2 = 0; 1199 mld2q->mld2q_suppress = sflag; 1200 mld2q->mld2q_qrv = 2; 1201 mld2q->mld2q_nsrcs = htons(llqt_srcs); 1202 mld2q->mld2q_qqic = mldv2_qqic(brmctx->multicast_query_interval / HZ); 1203 mld2q->mld2q_mca = *group; 1204 csum = &mld2q->mld2q_cksum; 1205 csum_start = (void *)mld2q; 1206 if (!pg || !with_srcs) 1207 break; 1208 1209 llqt_srcs = 0; 1210 hlist_for_each_entry(ent, &pg->src_list, node) { 1211 if (over_llqt == time_after(ent->timer.expires, 1212 llqt) && 1213 ent->src_query_rexmit_cnt > 0) { 1214 mld2q->mld2q_srcs[llqt_srcs++] = ent->addr.src.ip6; 1215 ent->src_query_rexmit_cnt--; 1216 if (need_rexmit && ent->src_query_rexmit_cnt) 1217 *need_rexmit = true; 1218 } 1219 } 1220 if (WARN_ON(llqt_srcs != ntohs(mld2q->mld2q_nsrcs))) { 1221 kfree_skb(skb); 1222 return NULL; 1223 } 1224 break; 1225 } 1226 1227 if (WARN_ON(!csum || !csum_start)) { 1228 kfree_skb(skb); 1229 return NULL; 1230 } 1231 1232 *csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, mld_hdr_size, 1233 IPPROTO_ICMPV6, 1234 csum_partial(csum_start, mld_hdr_size, 0)); 1235 skb_put(skb, mld_hdr_size); 1236 __skb_pull(skb, sizeof(*eth)); 1237 1238 out: 1239 return skb; 1240 } 1241 #endif 1242 1243 static struct sk_buff *br_multicast_alloc_query(struct net_bridge_mcast *brmctx, 1244 struct net_bridge_mcast_port *pmctx, 1245 struct net_bridge_port_group *pg, 1246 struct br_ip *ip_dst, 1247 struct br_ip *group, 1248 bool with_srcs, bool over_lmqt, 1249 u8 sflag, bool *need_rexmit) 1250 { 1251 __be32 ip4_dst; 1252 1253 switch (group->proto) { 1254 case htons(ETH_P_IP): 1255 ip4_dst = ip_dst ? ip_dst->dst.ip4 : htonl(INADDR_ALLHOSTS_GROUP); 1256 return br_ip4_multicast_alloc_query(brmctx, pmctx, pg, 1257 ip4_dst, group->dst.ip4, 1258 with_srcs, over_lmqt, 1259 sflag, need_rexmit); 1260 #if IS_ENABLED(CONFIG_IPV6) 1261 case htons(ETH_P_IPV6): { 1262 struct in6_addr ip6_dst; 1263 1264 if (ip_dst) 1265 ip6_dst = ip_dst->dst.ip6; 1266 else 1267 ipv6_addr_set(&ip6_dst, htonl(0xff020000), 0, 0, 1268 htonl(1)); 1269 1270 return br_ip6_multicast_alloc_query(brmctx, pmctx, pg, 1271 &ip6_dst, &group->dst.ip6, 1272 with_srcs, over_lmqt, 1273 sflag, need_rexmit); 1274 } 1275 #endif 1276 } 1277 return NULL; 1278 } 1279 1280 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, 1281 struct br_ip *group) 1282 { 1283 struct net_bridge_mdb_entry *mp; 1284 int err; 1285 1286 mp = br_mdb_ip_get(br, group); 1287 if (mp) 1288 return mp; 1289 1290 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) { 1291 trace_br_mdb_full(br->dev, group); 1292 br_mc_disabled_update(br->dev, false, NULL); 1293 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false); 1294 return ERR_PTR(-E2BIG); 1295 } 1296 1297 mp = kzalloc_obj(*mp, GFP_ATOMIC); 1298 if (unlikely(!mp)) 1299 return ERR_PTR(-ENOMEM); 1300 1301 mp->br = br; 1302 mp->addr = *group; 1303 mp->mcast_gc.destroy = br_multicast_destroy_mdb_entry; 1304 timer_setup(&mp->timer, br_multicast_group_expired, 0); 1305 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode, 1306 br_mdb_rht_params); 1307 if (err) { 1308 kfree(mp); 1309 mp = ERR_PTR(err); 1310 } else { 1311 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list); 1312 } 1313 1314 return mp; 1315 } 1316 1317 static void br_multicast_group_src_expired(struct timer_list *t) 1318 { 1319 struct net_bridge_group_src *src = timer_container_of(src, t, timer); 1320 struct net_bridge_port_group *pg; 1321 struct net_bridge *br = src->br; 1322 1323 spin_lock(&br->multicast_lock); 1324 if (hlist_unhashed(&src->node) || !netif_running(br->dev) || 1325 timer_pending(&src->timer)) 1326 goto out; 1327 1328 pg = src->pg; 1329 if (pg->filter_mode == MCAST_INCLUDE) { 1330 br_multicast_del_group_src(src, false); 1331 if (!hlist_empty(&pg->src_list)) 1332 goto out; 1333 br_multicast_find_del_pg(br, pg); 1334 } else { 1335 br_multicast_fwd_src_handle(src); 1336 } 1337 1338 out: 1339 spin_unlock(&br->multicast_lock); 1340 } 1341 1342 struct net_bridge_group_src * 1343 br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip) 1344 { 1345 struct net_bridge_group_src *ent; 1346 1347 switch (ip->proto) { 1348 case htons(ETH_P_IP): 1349 hlist_for_each_entry(ent, &pg->src_list, node) 1350 if (ip->src.ip4 == ent->addr.src.ip4) 1351 return ent; 1352 break; 1353 #if IS_ENABLED(CONFIG_IPV6) 1354 case htons(ETH_P_IPV6): 1355 hlist_for_each_entry(ent, &pg->src_list, node) 1356 if (!ipv6_addr_cmp(&ent->addr.src.ip6, &ip->src.ip6)) 1357 return ent; 1358 break; 1359 #endif 1360 } 1361 1362 return NULL; 1363 } 1364 1365 struct net_bridge_group_src * 1366 br_multicast_new_group_src(struct net_bridge_port_group *pg, struct br_ip *src_ip) 1367 { 1368 struct net_bridge_group_src *grp_src; 1369 1370 if (unlikely(pg->src_ents >= PG_SRC_ENT_LIMIT)) 1371 return NULL; 1372 1373 switch (src_ip->proto) { 1374 case htons(ETH_P_IP): 1375 if (ipv4_is_zeronet(src_ip->src.ip4) || 1376 ipv4_is_multicast(src_ip->src.ip4)) 1377 return NULL; 1378 break; 1379 #if IS_ENABLED(CONFIG_IPV6) 1380 case htons(ETH_P_IPV6): 1381 if (ipv6_addr_any(&src_ip->src.ip6) || 1382 ipv6_addr_is_multicast(&src_ip->src.ip6)) 1383 return NULL; 1384 break; 1385 #endif 1386 } 1387 1388 grp_src = kzalloc_obj(*grp_src, GFP_ATOMIC); 1389 if (unlikely(!grp_src)) 1390 return NULL; 1391 1392 grp_src->pg = pg; 1393 grp_src->br = pg->key.port->br; 1394 grp_src->addr = *src_ip; 1395 grp_src->mcast_gc.destroy = br_multicast_destroy_group_src; 1396 timer_setup(&grp_src->timer, br_multicast_group_src_expired, 0); 1397 1398 hlist_add_head_rcu(&grp_src->node, &pg->src_list); 1399 pg->src_ents++; 1400 1401 return grp_src; 1402 } 1403 1404 struct net_bridge_port_group *br_multicast_new_port_group( 1405 struct net_bridge_port *port, 1406 const struct br_ip *group, 1407 struct net_bridge_port_group __rcu *next, 1408 unsigned char flags, 1409 const unsigned char *src, 1410 u8 filter_mode, 1411 u8 rt_protocol, 1412 struct netlink_ext_ack *extack) 1413 { 1414 struct net_bridge_port_group *p; 1415 int err; 1416 1417 err = br_multicast_port_ngroups_inc(port, group, extack); 1418 if (err) 1419 return NULL; 1420 1421 p = kzalloc_obj(*p, GFP_ATOMIC); 1422 if (unlikely(!p)) { 1423 NL_SET_ERR_MSG_MOD(extack, "Couldn't allocate new port group"); 1424 goto dec_out; 1425 } 1426 1427 p->key.addr = *group; 1428 p->key.port = port; 1429 p->flags = flags; 1430 p->filter_mode = filter_mode; 1431 p->rt_protocol = rt_protocol; 1432 p->eht_host_tree = RB_ROOT; 1433 p->eht_set_tree = RB_ROOT; 1434 p->mcast_gc.destroy = br_multicast_destroy_port_group; 1435 INIT_HLIST_HEAD(&p->src_list); 1436 1437 if (!br_multicast_is_star_g(group) && 1438 rhashtable_lookup_insert_fast(&port->br->sg_port_tbl, &p->rhnode, 1439 br_sg_port_rht_params)) { 1440 NL_SET_ERR_MSG_MOD(extack, "Couldn't insert new port group"); 1441 goto free_out; 1442 } 1443 1444 rcu_assign_pointer(p->next, next); 1445 timer_setup(&p->timer, br_multicast_port_group_expired, 0); 1446 timer_setup(&p->rexmit_timer, br_multicast_port_group_rexmit, 0); 1447 hlist_add_head(&p->mglist, &port->mglist); 1448 1449 if (src) 1450 memcpy(p->eth_addr, src, ETH_ALEN); 1451 else 1452 eth_broadcast_addr(p->eth_addr); 1453 1454 return p; 1455 1456 free_out: 1457 kfree(p); 1458 dec_out: 1459 br_multicast_port_ngroups_dec(port, group->vid); 1460 return NULL; 1461 } 1462 1463 void br_multicast_del_port_group(struct net_bridge_port_group *p) 1464 { 1465 struct net_bridge_port *port = p->key.port; 1466 __u16 vid = p->key.addr.vid; 1467 1468 hlist_del_init(&p->mglist); 1469 if (!br_multicast_is_star_g(&p->key.addr)) 1470 rhashtable_remove_fast(&port->br->sg_port_tbl, &p->rhnode, 1471 br_sg_port_rht_params); 1472 kfree(p); 1473 br_multicast_port_ngroups_dec(port, vid); 1474 } 1475 1476 void br_multicast_host_join(const struct net_bridge_mcast *brmctx, 1477 struct net_bridge_mdb_entry *mp, bool notify) 1478 { 1479 if (!mp->host_joined) { 1480 mp->host_joined = true; 1481 if (br_multicast_is_star_g(&mp->addr)) 1482 br_multicast_star_g_host_state(mp); 1483 if (notify) 1484 br_mdb_notify(mp->br->dev, mp, NULL, RTM_NEWMDB); 1485 } 1486 1487 if (br_group_is_l2(&mp->addr)) 1488 return; 1489 1490 mod_timer(&mp->timer, jiffies + brmctx->multicast_membership_interval); 1491 } 1492 1493 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify) 1494 { 1495 if (!mp->host_joined) 1496 return; 1497 1498 mp->host_joined = false; 1499 if (br_multicast_is_star_g(&mp->addr)) 1500 br_multicast_star_g_host_state(mp); 1501 if (notify) 1502 br_mdb_notify(mp->br->dev, mp, NULL, RTM_DELMDB); 1503 } 1504 1505 static struct net_bridge_port_group * 1506 __br_multicast_add_group(struct net_bridge_mcast *brmctx, 1507 struct net_bridge_mcast_port *pmctx, 1508 struct br_ip *group, 1509 const unsigned char *src, 1510 u8 filter_mode, 1511 bool igmpv2_mldv1, 1512 bool blocked) 1513 { 1514 struct net_bridge_port_group __rcu **pp; 1515 struct net_bridge_port_group *p = NULL; 1516 struct net_bridge_mdb_entry *mp; 1517 unsigned long now = jiffies; 1518 1519 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 1520 goto out; 1521 1522 mp = br_multicast_new_group(brmctx->br, group); 1523 if (IS_ERR(mp)) 1524 return ERR_CAST(mp); 1525 1526 if (!pmctx) { 1527 br_multicast_host_join(brmctx, mp, true); 1528 goto out; 1529 } 1530 1531 for (pp = &mp->ports; 1532 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 1533 pp = &p->next) { 1534 if (br_port_group_equal(p, pmctx->port, src)) 1535 goto found; 1536 if ((unsigned long)p->key.port < (unsigned long)pmctx->port) 1537 break; 1538 } 1539 1540 p = br_multicast_new_port_group(pmctx->port, group, *pp, 0, src, 1541 filter_mode, RTPROT_KERNEL, NULL); 1542 if (unlikely(!p)) { 1543 p = ERR_PTR(-ENOMEM); 1544 goto out; 1545 } 1546 rcu_assign_pointer(*pp, p); 1547 if (blocked) 1548 p->flags |= MDB_PG_FLAGS_BLOCKED; 1549 br_mdb_notify(brmctx->br->dev, mp, p, RTM_NEWMDB); 1550 1551 found: 1552 if (igmpv2_mldv1) 1553 mod_timer(&p->timer, 1554 now + brmctx->multicast_membership_interval); 1555 1556 out: 1557 return p; 1558 } 1559 1560 static int br_multicast_add_group(struct net_bridge_mcast *brmctx, 1561 struct net_bridge_mcast_port *pmctx, 1562 struct br_ip *group, 1563 const unsigned char *src, 1564 u8 filter_mode, 1565 bool igmpv2_mldv1) 1566 { 1567 struct net_bridge_port_group *pg; 1568 int err; 1569 1570 spin_lock(&brmctx->br->multicast_lock); 1571 pg = __br_multicast_add_group(brmctx, pmctx, group, src, filter_mode, 1572 igmpv2_mldv1, false); 1573 /* NULL is considered valid for host joined groups */ 1574 err = PTR_ERR_OR_ZERO(pg); 1575 spin_unlock(&brmctx->br->multicast_lock); 1576 1577 return err; 1578 } 1579 1580 static int br_ip4_multicast_add_group(struct net_bridge_mcast *brmctx, 1581 struct net_bridge_mcast_port *pmctx, 1582 __be32 group, 1583 __u16 vid, 1584 const unsigned char *src, 1585 bool igmpv2) 1586 { 1587 struct br_ip br_group; 1588 u8 filter_mode; 1589 1590 if (ipv4_is_local_multicast(group)) 1591 return 0; 1592 1593 memset(&br_group, 0, sizeof(br_group)); 1594 br_group.dst.ip4 = group; 1595 br_group.proto = htons(ETH_P_IP); 1596 br_group.vid = vid; 1597 filter_mode = igmpv2 ? MCAST_EXCLUDE : MCAST_INCLUDE; 1598 1599 return br_multicast_add_group(brmctx, pmctx, &br_group, src, 1600 filter_mode, igmpv2); 1601 } 1602 1603 #if IS_ENABLED(CONFIG_IPV6) 1604 static int br_ip6_multicast_add_group(struct net_bridge_mcast *brmctx, 1605 struct net_bridge_mcast_port *pmctx, 1606 const struct in6_addr *group, 1607 __u16 vid, 1608 const unsigned char *src, 1609 bool mldv1) 1610 { 1611 struct br_ip br_group; 1612 u8 filter_mode; 1613 1614 if (ipv6_addr_is_ll_all_nodes(group)) 1615 return 0; 1616 1617 memset(&br_group, 0, sizeof(br_group)); 1618 br_group.dst.ip6 = *group; 1619 br_group.proto = htons(ETH_P_IPV6); 1620 br_group.vid = vid; 1621 filter_mode = mldv1 ? MCAST_EXCLUDE : MCAST_INCLUDE; 1622 1623 return br_multicast_add_group(brmctx, pmctx, &br_group, src, 1624 filter_mode, mldv1); 1625 } 1626 #endif 1627 1628 static bool br_multicast_rport_del(struct hlist_node *rlist) 1629 { 1630 if (hlist_unhashed(rlist)) 1631 return false; 1632 1633 hlist_del_init_rcu(rlist); 1634 return true; 1635 } 1636 1637 static bool br_ip4_multicast_rport_del(struct net_bridge_mcast_port *pmctx) 1638 { 1639 return br_multicast_rport_del(&pmctx->ip4_rlist); 1640 } 1641 1642 static bool br_ip6_multicast_rport_del(struct net_bridge_mcast_port *pmctx) 1643 { 1644 #if IS_ENABLED(CONFIG_IPV6) 1645 return br_multicast_rport_del(&pmctx->ip6_rlist); 1646 #else 1647 return false; 1648 #endif 1649 } 1650 1651 static void br_multicast_router_expired(struct net_bridge_mcast_port *pmctx, 1652 struct timer_list *t, 1653 struct hlist_node *rlist) 1654 { 1655 struct net_bridge *br = pmctx->port->br; 1656 bool del; 1657 1658 spin_lock(&br->multicast_lock); 1659 if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED || 1660 pmctx->multicast_router == MDB_RTR_TYPE_PERM || 1661 timer_pending(t)) 1662 goto out; 1663 1664 del = br_multicast_rport_del(rlist); 1665 br_multicast_rport_del_notify(pmctx, del); 1666 out: 1667 spin_unlock(&br->multicast_lock); 1668 } 1669 1670 static void br_ip4_multicast_router_expired(struct timer_list *t) 1671 { 1672 struct net_bridge_mcast_port *pmctx = timer_container_of(pmctx, t, 1673 ip4_mc_router_timer); 1674 1675 br_multicast_router_expired(pmctx, t, &pmctx->ip4_rlist); 1676 } 1677 1678 #if IS_ENABLED(CONFIG_IPV6) 1679 static void br_ip6_multicast_router_expired(struct timer_list *t) 1680 { 1681 struct net_bridge_mcast_port *pmctx = timer_container_of(pmctx, t, 1682 ip6_mc_router_timer); 1683 1684 br_multicast_router_expired(pmctx, t, &pmctx->ip6_rlist); 1685 } 1686 #endif 1687 1688 static void br_mc_router_state_change(struct net_bridge *p, 1689 bool is_mc_router) 1690 { 1691 struct switchdev_attr attr = { 1692 .orig_dev = p->dev, 1693 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER, 1694 .flags = SWITCHDEV_F_DEFER, 1695 .u.mrouter = is_mc_router, 1696 }; 1697 1698 switchdev_port_attr_set(p->dev, &attr, NULL); 1699 } 1700 1701 static void br_multicast_local_router_expired(struct net_bridge_mcast *brmctx, 1702 struct timer_list *timer) 1703 { 1704 spin_lock(&brmctx->br->multicast_lock); 1705 if (brmctx->multicast_router == MDB_RTR_TYPE_DISABLED || 1706 brmctx->multicast_router == MDB_RTR_TYPE_PERM || 1707 br_ip4_multicast_is_router(brmctx) || 1708 br_ip6_multicast_is_router(brmctx)) 1709 goto out; 1710 1711 br_mc_router_state_change(brmctx->br, false); 1712 out: 1713 spin_unlock(&brmctx->br->multicast_lock); 1714 } 1715 1716 static void br_ip4_multicast_local_router_expired(struct timer_list *t) 1717 { 1718 struct net_bridge_mcast *brmctx = timer_container_of(brmctx, t, 1719 ip4_mc_router_timer); 1720 1721 br_multicast_local_router_expired(brmctx, t); 1722 } 1723 1724 #if IS_ENABLED(CONFIG_IPV6) 1725 static void br_ip6_multicast_local_router_expired(struct timer_list *t) 1726 { 1727 struct net_bridge_mcast *brmctx = timer_container_of(brmctx, t, 1728 ip6_mc_router_timer); 1729 1730 br_multicast_local_router_expired(brmctx, t); 1731 } 1732 #endif 1733 1734 static void br_multicast_querier_expired(struct net_bridge_mcast *brmctx, 1735 struct bridge_mcast_own_query *query) 1736 { 1737 spin_lock(&brmctx->br->multicast_lock); 1738 if (!netif_running(brmctx->br->dev) || 1739 br_multicast_ctx_vlan_global_disabled(brmctx) || 1740 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) 1741 goto out; 1742 1743 br_multicast_start_querier(brmctx, query); 1744 1745 out: 1746 spin_unlock(&brmctx->br->multicast_lock); 1747 } 1748 1749 static void br_ip4_multicast_querier_expired(struct timer_list *t) 1750 { 1751 struct net_bridge_mcast *brmctx = timer_container_of(brmctx, t, 1752 ip4_other_query.timer); 1753 1754 br_multicast_querier_expired(brmctx, &brmctx->ip4_own_query); 1755 } 1756 1757 #if IS_ENABLED(CONFIG_IPV6) 1758 static void br_ip6_multicast_querier_expired(struct timer_list *t) 1759 { 1760 struct net_bridge_mcast *brmctx = timer_container_of(brmctx, t, 1761 ip6_other_query.timer); 1762 1763 br_multicast_querier_expired(brmctx, &brmctx->ip6_own_query); 1764 } 1765 #endif 1766 1767 static void br_multicast_query_delay_expired(struct timer_list *t) 1768 { 1769 } 1770 1771 static void br_multicast_select_own_querier(struct net_bridge_mcast *brmctx, 1772 struct br_ip *ip, 1773 struct sk_buff *skb) 1774 { 1775 if (ip->proto == htons(ETH_P_IP)) 1776 brmctx->ip4_querier.addr.src.ip4 = ip_hdr(skb)->saddr; 1777 #if IS_ENABLED(CONFIG_IPV6) 1778 else 1779 brmctx->ip6_querier.addr.src.ip6 = ipv6_hdr(skb)->saddr; 1780 #endif 1781 } 1782 1783 static u8 br_multicast_query_type(const struct sk_buff *skb) 1784 { 1785 return skb->protocol == htons(ETH_P_IP) ? IGMP_HOST_MEMBERSHIP_QUERY : 1786 ICMPV6_MGM_QUERY; 1787 } 1788 1789 static void br_multicast_port_query_queue_work(struct work_struct *work) 1790 { 1791 struct net_bridge_mcast_port *pmctx; 1792 struct sk_buff_head list; 1793 struct sk_buff *skb; 1794 1795 pmctx = container_of(work, struct net_bridge_mcast_port, 1796 query_queue_work); 1797 1798 __skb_queue_head_init(&list); 1799 spin_lock_bh(&pmctx->query_queue.lock); 1800 skb_queue_splice_tail_init(&pmctx->query_queue, &list); 1801 spin_unlock_bh(&pmctx->query_queue.lock); 1802 1803 while ((skb = __skb_dequeue(&list))) { 1804 u8 query_type = br_multicast_query_type(skb); 1805 1806 local_bh_disable(); 1807 br_multicast_count(pmctx->port->br, pmctx->port, skb, 1808 query_type, BR_MCAST_DIR_TX); 1809 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, dev_net(skb->dev), 1810 NULL, skb, NULL, skb->dev, br_dev_queue_push_xmit); 1811 local_bh_enable(); 1812 } 1813 } 1814 1815 static void br_multicast_query_queue_work(struct work_struct *work) 1816 { 1817 struct net_bridge_mcast *brmctx; 1818 struct sk_buff_head list; 1819 struct sk_buff *skb; 1820 1821 brmctx = container_of(work, struct net_bridge_mcast, query_queue_work); 1822 1823 __skb_queue_head_init(&list); 1824 spin_lock_bh(&brmctx->query_queue.lock); 1825 skb_queue_splice_tail_init(&brmctx->query_queue, &list); 1826 spin_unlock_bh(&brmctx->query_queue.lock); 1827 1828 while ((skb = __skb_dequeue(&list))) { 1829 u8 query_type = br_multicast_query_type(skb); 1830 1831 local_bh_disable(); 1832 br_multicast_count(brmctx->br, NULL, skb, query_type, 1833 BR_MCAST_DIR_RX); 1834 netif_rx(skb); 1835 local_bh_enable(); 1836 } 1837 } 1838 1839 #define BR_MULTICAST_QUERY_QUEUE_LEN_MAX 1000 1840 1841 static void __br_multicast_send_query(struct net_bridge_mcast *brmctx, 1842 struct net_bridge_mcast_port *pmctx, 1843 struct net_bridge_port_group *pg, 1844 struct br_ip *ip_dst, 1845 struct br_ip *group, 1846 bool with_srcs, 1847 u8 sflag, 1848 bool *need_rexmit) 1849 { 1850 struct sk_buff_head *queue; 1851 bool over_lmqt = !!sflag; 1852 struct sk_buff *skb; 1853 1854 if (!br_multicast_ctx_should_use(brmctx, pmctx) || 1855 !br_multicast_ctx_matches_vlan_snooping(brmctx)) 1856 return; 1857 1858 queue = pmctx ? &pmctx->query_queue : &brmctx->query_queue; 1859 1860 again_under_lmqt: 1861 if (skb_queue_len_lockless(queue) >= BR_MULTICAST_QUERY_QUEUE_LEN_MAX) 1862 return; 1863 1864 skb = br_multicast_alloc_query(brmctx, pmctx, pg, ip_dst, group, 1865 with_srcs, over_lmqt, sflag, 1866 need_rexmit); 1867 if (!skb) 1868 return; 1869 1870 if (pmctx) { 1871 skb->dev = pmctx->port->dev; 1872 skb_queue_tail(queue, skb); 1873 queue_work(system_highpri_wq, &pmctx->query_queue_work); 1874 1875 if (over_lmqt && with_srcs && sflag) { 1876 over_lmqt = false; 1877 goto again_under_lmqt; 1878 } 1879 } else { 1880 br_multicast_select_own_querier(brmctx, group, skb); 1881 skb_queue_tail(queue, skb); 1882 queue_work(system_highpri_wq, &brmctx->query_queue_work); 1883 } 1884 } 1885 1886 static void br_multicast_read_querier(const struct bridge_mcast_querier *querier, 1887 struct bridge_mcast_querier *dest) 1888 { 1889 unsigned int seq; 1890 1891 memset(dest, 0, sizeof(*dest)); 1892 do { 1893 seq = read_seqcount_begin(&querier->seq); 1894 dest->port_ifidx = querier->port_ifidx; 1895 memcpy(&dest->addr, &querier->addr, sizeof(struct br_ip)); 1896 } while (read_seqcount_retry(&querier->seq, seq)); 1897 } 1898 1899 static void br_multicast_update_querier(struct net_bridge_mcast *brmctx, 1900 struct bridge_mcast_querier *querier, 1901 int ifindex, 1902 struct br_ip *saddr) 1903 { 1904 write_seqcount_begin(&querier->seq); 1905 querier->port_ifidx = ifindex; 1906 memcpy(&querier->addr, saddr, sizeof(*saddr)); 1907 write_seqcount_end(&querier->seq); 1908 } 1909 1910 static void br_multicast_send_query(struct net_bridge_mcast *brmctx, 1911 struct net_bridge_mcast_port *pmctx, 1912 struct bridge_mcast_own_query *own_query) 1913 { 1914 struct bridge_mcast_other_query *other_query = NULL; 1915 struct bridge_mcast_querier *querier; 1916 struct br_ip br_group; 1917 unsigned long time; 1918 1919 if (!br_multicast_ctx_should_use(brmctx, pmctx) || 1920 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) || 1921 !brmctx->multicast_querier) 1922 return; 1923 1924 memset(&br_group.dst, 0, sizeof(br_group.dst)); 1925 1926 if (pmctx ? (own_query == &pmctx->ip4_own_query) : 1927 (own_query == &brmctx->ip4_own_query)) { 1928 querier = &brmctx->ip4_querier; 1929 other_query = &brmctx->ip4_other_query; 1930 br_group.proto = htons(ETH_P_IP); 1931 #if IS_ENABLED(CONFIG_IPV6) 1932 } else { 1933 querier = &brmctx->ip6_querier; 1934 other_query = &brmctx->ip6_other_query; 1935 br_group.proto = htons(ETH_P_IPV6); 1936 #endif 1937 } 1938 1939 if (!other_query || timer_pending(&other_query->timer)) 1940 return; 1941 1942 /* we're about to select ourselves as querier */ 1943 if (!pmctx && querier->port_ifidx) { 1944 struct br_ip zeroip = {}; 1945 1946 br_multicast_update_querier(brmctx, querier, 0, &zeroip); 1947 } 1948 1949 __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &br_group, false, 1950 0, NULL); 1951 1952 time = jiffies; 1953 time += own_query->startup_sent < brmctx->multicast_startup_query_count ? 1954 brmctx->multicast_startup_query_interval : 1955 brmctx->multicast_query_interval; 1956 mod_timer(&own_query->timer, time); 1957 } 1958 1959 static void 1960 br_multicast_port_query_expired(struct net_bridge_mcast_port *pmctx, 1961 struct bridge_mcast_own_query *query) 1962 { 1963 struct net_bridge *br = pmctx->port->br; 1964 struct net_bridge_mcast *brmctx; 1965 1966 spin_lock(&br->multicast_lock); 1967 if (br_multicast_port_ctx_state_stopped(pmctx)) 1968 goto out; 1969 1970 brmctx = br_multicast_port_ctx_get_global(pmctx); 1971 if (query->startup_sent < brmctx->multicast_startup_query_count) 1972 query->startup_sent++; 1973 1974 br_multicast_send_query(brmctx, pmctx, query); 1975 1976 out: 1977 spin_unlock(&br->multicast_lock); 1978 } 1979 1980 static void br_ip4_multicast_port_query_expired(struct timer_list *t) 1981 { 1982 struct net_bridge_mcast_port *pmctx = timer_container_of(pmctx, t, 1983 ip4_own_query.timer); 1984 1985 br_multicast_port_query_expired(pmctx, &pmctx->ip4_own_query); 1986 } 1987 1988 #if IS_ENABLED(CONFIG_IPV6) 1989 static void br_ip6_multicast_port_query_expired(struct timer_list *t) 1990 { 1991 struct net_bridge_mcast_port *pmctx = timer_container_of(pmctx, t, 1992 ip6_own_query.timer); 1993 1994 br_multicast_port_query_expired(pmctx, &pmctx->ip6_own_query); 1995 } 1996 #endif 1997 1998 static void br_multicast_port_group_rexmit(struct timer_list *t) 1999 { 2000 struct net_bridge_port_group *pg = timer_container_of(pg, t, 2001 rexmit_timer); 2002 struct bridge_mcast_other_query *other_query = NULL; 2003 struct net_bridge *br = pg->key.port->br; 2004 struct net_bridge_mcast_port *pmctx; 2005 struct net_bridge_mcast *brmctx; 2006 bool need_rexmit = false; 2007 2008 spin_lock(&br->multicast_lock); 2009 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) || 2010 !br_opt_get(br, BROPT_MULTICAST_ENABLED)) 2011 goto out; 2012 2013 pmctx = br_multicast_pg_to_port_ctx(pg); 2014 if (!pmctx) 2015 goto out; 2016 brmctx = br_multicast_port_ctx_get_global(pmctx); 2017 if (!brmctx->multicast_querier) 2018 goto out; 2019 2020 if (pg->key.addr.proto == htons(ETH_P_IP)) 2021 other_query = &brmctx->ip4_other_query; 2022 #if IS_ENABLED(CONFIG_IPV6) 2023 else 2024 other_query = &brmctx->ip6_other_query; 2025 #endif 2026 2027 if (!other_query || timer_pending(&other_query->timer)) 2028 goto out; 2029 2030 if (pg->grp_query_rexmit_cnt) { 2031 pg->grp_query_rexmit_cnt--; 2032 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 2033 &pg->key.addr, false, 1, NULL); 2034 } 2035 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 2036 &pg->key.addr, true, 0, &need_rexmit); 2037 2038 if (pg->grp_query_rexmit_cnt || need_rexmit) 2039 mod_timer(&pg->rexmit_timer, jiffies + 2040 brmctx->multicast_last_member_interval); 2041 out: 2042 spin_unlock(&br->multicast_lock); 2043 } 2044 2045 static int br_mc_disabled_update(struct net_device *dev, bool value, 2046 struct netlink_ext_ack *extack) 2047 { 2048 struct switchdev_attr attr = { 2049 .orig_dev = dev, 2050 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED, 2051 .flags = SWITCHDEV_F_DEFER, 2052 .u.mc_disabled = !value, 2053 }; 2054 2055 return switchdev_port_attr_set(dev, &attr, extack); 2056 } 2057 2058 void br_multicast_port_ctx_init(struct net_bridge_port *port, 2059 struct net_bridge_vlan *vlan, 2060 struct net_bridge_mcast_port *pmctx) 2061 { 2062 pmctx->port = port; 2063 pmctx->vlan = vlan; 2064 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 2065 2066 skb_queue_head_init(&pmctx->query_queue); 2067 INIT_WORK(&pmctx->query_queue_work, br_multicast_port_query_queue_work); 2068 2069 timer_setup(&pmctx->ip4_mc_router_timer, 2070 br_ip4_multicast_router_expired, 0); 2071 timer_setup(&pmctx->ip4_own_query.timer, 2072 br_ip4_multicast_port_query_expired, 0); 2073 #if IS_ENABLED(CONFIG_IPV6) 2074 timer_setup(&pmctx->ip6_mc_router_timer, 2075 br_ip6_multicast_router_expired, 0); 2076 timer_setup(&pmctx->ip6_own_query.timer, 2077 br_ip6_multicast_port_query_expired, 0); 2078 #endif 2079 /* initialize mdb_n_entries if a new port vlan is being created */ 2080 if (vlan) { 2081 struct net_bridge_port_group *pg; 2082 u32 n = 0; 2083 2084 spin_lock_bh(&port->br->multicast_lock); 2085 hlist_for_each_entry(pg, &port->mglist, mglist) 2086 if (pg->key.addr.vid == vlan->vid) 2087 n++; 2088 WRITE_ONCE(pmctx->mdb_n_entries, n); 2089 spin_unlock_bh(&port->br->multicast_lock); 2090 } 2091 } 2092 2093 void br_multicast_port_ctx_deinit(struct net_bridge_mcast_port *pmctx) 2094 { 2095 struct net_bridge *br = pmctx->port->br; 2096 bool del = false; 2097 2098 #if IS_ENABLED(CONFIG_IPV6) 2099 timer_shutdown_sync(&pmctx->ip6_own_query.timer); 2100 timer_shutdown_sync(&pmctx->ip6_mc_router_timer); 2101 #endif 2102 timer_shutdown_sync(&pmctx->ip4_own_query.timer); 2103 timer_shutdown_sync(&pmctx->ip4_mc_router_timer); 2104 2105 spin_lock_bh(&br->multicast_lock); 2106 del |= br_ip6_multicast_rport_del(pmctx); 2107 del |= br_ip4_multicast_rport_del(pmctx); 2108 br_multicast_rport_del_notify(pmctx, del); 2109 spin_unlock_bh(&br->multicast_lock); 2110 cancel_work_sync(&pmctx->query_queue_work); 2111 __skb_queue_purge(&pmctx->query_queue); 2112 } 2113 2114 int br_multicast_add_port(struct net_bridge_port *port) 2115 { 2116 int err; 2117 2118 port->multicast_eht_hosts_limit = BR_MCAST_DEFAULT_EHT_HOSTS_LIMIT; 2119 br_multicast_port_ctx_init(port, NULL, &port->multicast_ctx); 2120 2121 err = br_mc_disabled_update(port->dev, 2122 br_opt_get(port->br, 2123 BROPT_MULTICAST_ENABLED), 2124 NULL); 2125 if (err && err != -EOPNOTSUPP) 2126 return err; 2127 2128 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 2129 if (!port->mcast_stats) 2130 return -ENOMEM; 2131 2132 return 0; 2133 } 2134 2135 void br_multicast_del_port(struct net_bridge_port *port) 2136 { 2137 struct net_bridge *br = port->br; 2138 struct net_bridge_port_group *pg; 2139 struct hlist_node *n; 2140 2141 /* Take care of the remaining groups, only perm ones should be left */ 2142 spin_lock_bh(&br->multicast_lock); 2143 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 2144 br_multicast_find_del_pg(br, pg); 2145 spin_unlock_bh(&br->multicast_lock); 2146 flush_work(&br->mcast_gc_work); 2147 br_multicast_port_ctx_deinit(&port->multicast_ctx); 2148 free_percpu(port->mcast_stats); 2149 } 2150 2151 static void br_multicast_enable(struct bridge_mcast_own_query *query) 2152 { 2153 query->startup_sent = 0; 2154 2155 if (timer_delete_sync_try(&query->timer) >= 0 || 2156 timer_delete(&query->timer)) 2157 mod_timer(&query->timer, jiffies); 2158 } 2159 2160 static void __br_multicast_enable_port_ctx(struct net_bridge_mcast_port *pmctx) 2161 { 2162 struct net_bridge *br = pmctx->port->br; 2163 struct net_bridge_mcast *brmctx; 2164 2165 brmctx = br_multicast_port_ctx_get_global(pmctx); 2166 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || 2167 !netif_running(br->dev)) 2168 return; 2169 2170 br_multicast_enable(&pmctx->ip4_own_query); 2171 #if IS_ENABLED(CONFIG_IPV6) 2172 br_multicast_enable(&pmctx->ip6_own_query); 2173 #endif 2174 if (pmctx->multicast_router == MDB_RTR_TYPE_PERM) { 2175 br_ip4_multicast_add_router(brmctx, pmctx); 2176 br_ip6_multicast_add_router(brmctx, pmctx); 2177 } 2178 } 2179 2180 static void br_multicast_enable_port_ctx(struct net_bridge_mcast_port *pmctx) 2181 { 2182 struct net_bridge *br = pmctx->port->br; 2183 2184 spin_lock_bh(&br->multicast_lock); 2185 if (br_multicast_port_ctx_is_vlan(pmctx) && 2186 !(pmctx->vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) { 2187 spin_unlock_bh(&br->multicast_lock); 2188 return; 2189 } 2190 __br_multicast_enable_port_ctx(pmctx); 2191 spin_unlock_bh(&br->multicast_lock); 2192 } 2193 2194 static void __br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx) 2195 { 2196 struct net_bridge_port_group *pg; 2197 struct hlist_node *n; 2198 bool del = false; 2199 2200 hlist_for_each_entry_safe(pg, n, &pmctx->port->mglist, mglist) 2201 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT) && 2202 (!br_multicast_port_ctx_is_vlan(pmctx) || 2203 pg->key.addr.vid == pmctx->vlan->vid)) 2204 br_multicast_find_del_pg(pmctx->port->br, pg); 2205 2206 del |= br_ip4_multicast_rport_del(pmctx); 2207 timer_delete(&pmctx->ip4_mc_router_timer); 2208 timer_delete(&pmctx->ip4_own_query.timer); 2209 del |= br_ip6_multicast_rport_del(pmctx); 2210 #if IS_ENABLED(CONFIG_IPV6) 2211 timer_delete(&pmctx->ip6_mc_router_timer); 2212 timer_delete(&pmctx->ip6_own_query.timer); 2213 #endif 2214 br_multicast_rport_del_notify(pmctx, del); 2215 } 2216 2217 static void br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx) 2218 { 2219 struct net_bridge *br = pmctx->port->br; 2220 2221 spin_lock_bh(&br->multicast_lock); 2222 if (br_multicast_port_ctx_is_vlan(pmctx) && 2223 !(pmctx->vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) { 2224 spin_unlock_bh(&br->multicast_lock); 2225 return; 2226 } 2227 2228 __br_multicast_disable_port_ctx(pmctx); 2229 spin_unlock_bh(&br->multicast_lock); 2230 } 2231 2232 static void br_multicast_toggle_port(struct net_bridge_port *port, bool on) 2233 { 2234 #if IS_ENABLED(CONFIG_BRIDGE_VLAN_FILTERING) 2235 if (br_opt_get(port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { 2236 struct net_bridge_vlan_group *vg; 2237 struct net_bridge_vlan *vlan; 2238 2239 rcu_read_lock(); 2240 vg = nbp_vlan_group_rcu(port); 2241 if (!vg) { 2242 rcu_read_unlock(); 2243 return; 2244 } 2245 2246 /* iterate each vlan, toggle vlan multicast context */ 2247 list_for_each_entry_rcu(vlan, &vg->vlan_list, vlist) { 2248 struct net_bridge_mcast_port *pmctx = 2249 &vlan->port_mcast_ctx; 2250 u8 state = br_vlan_get_state(vlan); 2251 /* enable vlan multicast context when state is 2252 * LEARNING or FORWARDING 2253 */ 2254 if (on && br_vlan_state_allowed(state, true)) 2255 br_multicast_enable_port_ctx(pmctx); 2256 else 2257 br_multicast_disable_port_ctx(pmctx); 2258 } 2259 rcu_read_unlock(); 2260 return; 2261 } 2262 #endif 2263 /* toggle port multicast context when vlan snooping is disabled */ 2264 if (on) 2265 br_multicast_enable_port_ctx(&port->multicast_ctx); 2266 else 2267 br_multicast_disable_port_ctx(&port->multicast_ctx); 2268 } 2269 2270 void br_multicast_enable_port(struct net_bridge_port *port) 2271 { 2272 br_multicast_toggle_port(port, true); 2273 } 2274 2275 void br_multicast_disable_port(struct net_bridge_port *port) 2276 { 2277 br_multicast_toggle_port(port, false); 2278 } 2279 2280 static int __grp_src_delete_marked(struct net_bridge_port_group *pg) 2281 { 2282 struct net_bridge_group_src *ent; 2283 struct hlist_node *tmp; 2284 int deleted = 0; 2285 2286 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) 2287 if (ent->flags & BR_SGRP_F_DELETE) { 2288 br_multicast_del_group_src(ent, false); 2289 deleted++; 2290 } 2291 2292 return deleted; 2293 } 2294 2295 static void __grp_src_mod_timer(struct net_bridge_group_src *src, 2296 unsigned long expires) 2297 { 2298 mod_timer(&src->timer, expires); 2299 br_multicast_fwd_src_handle(src); 2300 } 2301 2302 static void __grp_src_query_marked_and_rexmit(struct net_bridge_mcast *brmctx, 2303 struct net_bridge_mcast_port *pmctx, 2304 struct net_bridge_port_group *pg) 2305 { 2306 struct bridge_mcast_other_query *other_query = NULL; 2307 u32 lmqc = brmctx->multicast_last_member_count; 2308 unsigned long lmqt, lmi, now = jiffies; 2309 struct net_bridge_group_src *ent; 2310 2311 if (!netif_running(brmctx->br->dev) || 2312 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) 2313 return; 2314 2315 if (pg->key.addr.proto == htons(ETH_P_IP)) 2316 other_query = &brmctx->ip4_other_query; 2317 #if IS_ENABLED(CONFIG_IPV6) 2318 else 2319 other_query = &brmctx->ip6_other_query; 2320 #endif 2321 2322 lmqt = now + br_multicast_lmqt(brmctx); 2323 hlist_for_each_entry(ent, &pg->src_list, node) { 2324 if (ent->flags & BR_SGRP_F_SEND) { 2325 ent->flags &= ~BR_SGRP_F_SEND; 2326 if (ent->timer.expires > lmqt) { 2327 if (brmctx->multicast_querier && 2328 other_query && 2329 !timer_pending(&other_query->timer)) 2330 ent->src_query_rexmit_cnt = lmqc; 2331 __grp_src_mod_timer(ent, lmqt); 2332 } 2333 } 2334 } 2335 2336 if (!brmctx->multicast_querier || 2337 !other_query || timer_pending(&other_query->timer)) 2338 return; 2339 2340 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 2341 &pg->key.addr, true, 1, NULL); 2342 2343 lmi = now + brmctx->multicast_last_member_interval; 2344 if (!timer_pending(&pg->rexmit_timer) || 2345 time_after(pg->rexmit_timer.expires, lmi)) 2346 mod_timer(&pg->rexmit_timer, lmi); 2347 } 2348 2349 static void __grp_send_query_and_rexmit(struct net_bridge_mcast *brmctx, 2350 struct net_bridge_mcast_port *pmctx, 2351 struct net_bridge_port_group *pg) 2352 { 2353 struct bridge_mcast_other_query *other_query = NULL; 2354 unsigned long now = jiffies, lmi; 2355 2356 if (!netif_running(brmctx->br->dev) || 2357 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) 2358 return; 2359 2360 if (pg->key.addr.proto == htons(ETH_P_IP)) 2361 other_query = &brmctx->ip4_other_query; 2362 #if IS_ENABLED(CONFIG_IPV6) 2363 else 2364 other_query = &brmctx->ip6_other_query; 2365 #endif 2366 2367 if (brmctx->multicast_querier && 2368 other_query && !timer_pending(&other_query->timer)) { 2369 lmi = now + brmctx->multicast_last_member_interval; 2370 pg->grp_query_rexmit_cnt = brmctx->multicast_last_member_count - 1; 2371 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 2372 &pg->key.addr, false, 0, NULL); 2373 if (!timer_pending(&pg->rexmit_timer) || 2374 time_after(pg->rexmit_timer.expires, lmi)) 2375 mod_timer(&pg->rexmit_timer, lmi); 2376 } 2377 2378 if (pg->filter_mode == MCAST_EXCLUDE && 2379 (!timer_pending(&pg->timer) || 2380 time_after(pg->timer.expires, now + br_multicast_lmqt(brmctx)))) 2381 mod_timer(&pg->timer, now + br_multicast_lmqt(brmctx)); 2382 } 2383 2384 /* State Msg type New state Actions 2385 * INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI 2386 * INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI 2387 * EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI 2388 */ 2389 static bool br_multicast_isinc_allow(const struct net_bridge_mcast *brmctx, 2390 struct net_bridge_port_group *pg, void *h_addr, 2391 void *srcs, u32 nsrcs, size_t addr_size, 2392 int grec_type) 2393 { 2394 struct net_bridge_group_src *ent; 2395 unsigned long now = jiffies; 2396 bool changed = false; 2397 struct br_ip src_ip; 2398 u32 src_idx; 2399 2400 memset(&src_ip, 0, sizeof(src_ip)); 2401 src_ip.proto = pg->key.addr.proto; 2402 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2403 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2404 ent = br_multicast_find_group_src(pg, &src_ip); 2405 if (!ent) { 2406 ent = br_multicast_new_group_src(pg, &src_ip); 2407 if (ent) 2408 changed = true; 2409 } 2410 2411 if (ent) 2412 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx)); 2413 } 2414 2415 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2416 grec_type)) 2417 changed = true; 2418 2419 return changed; 2420 } 2421 2422 /* State Msg type New state Actions 2423 * INCLUDE (A) IS_EX (B) EXCLUDE (A*B,B-A) (B-A)=0 2424 * Delete (A-B) 2425 * Group Timer=GMI 2426 */ 2427 static void __grp_src_isexc_incl(const struct net_bridge_mcast *brmctx, 2428 struct net_bridge_port_group *pg, void *h_addr, 2429 void *srcs, u32 nsrcs, size_t addr_size, 2430 int grec_type) 2431 { 2432 struct net_bridge_group_src *ent; 2433 struct br_ip src_ip; 2434 u32 src_idx; 2435 2436 hlist_for_each_entry(ent, &pg->src_list, node) 2437 ent->flags |= BR_SGRP_F_DELETE; 2438 2439 memset(&src_ip, 0, sizeof(src_ip)); 2440 src_ip.proto = pg->key.addr.proto; 2441 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2442 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2443 ent = br_multicast_find_group_src(pg, &src_ip); 2444 if (ent) 2445 ent->flags &= ~BR_SGRP_F_DELETE; 2446 else 2447 ent = br_multicast_new_group_src(pg, &src_ip); 2448 if (ent) 2449 br_multicast_fwd_src_handle(ent); 2450 } 2451 2452 br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2453 grec_type); 2454 2455 __grp_src_delete_marked(pg); 2456 } 2457 2458 /* State Msg type New state Actions 2459 * EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=GMI 2460 * Delete (X-A) 2461 * Delete (Y-A) 2462 * Group Timer=GMI 2463 */ 2464 static bool __grp_src_isexc_excl(const struct net_bridge_mcast *brmctx, 2465 struct net_bridge_port_group *pg, void *h_addr, 2466 void *srcs, u32 nsrcs, size_t addr_size, 2467 int grec_type) 2468 { 2469 struct net_bridge_group_src *ent; 2470 unsigned long now = jiffies; 2471 bool changed = false; 2472 struct br_ip src_ip; 2473 u32 src_idx; 2474 2475 hlist_for_each_entry(ent, &pg->src_list, node) 2476 ent->flags |= BR_SGRP_F_DELETE; 2477 2478 memset(&src_ip, 0, sizeof(src_ip)); 2479 src_ip.proto = pg->key.addr.proto; 2480 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2481 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2482 ent = br_multicast_find_group_src(pg, &src_ip); 2483 if (ent) { 2484 ent->flags &= ~BR_SGRP_F_DELETE; 2485 } else { 2486 ent = br_multicast_new_group_src(pg, &src_ip); 2487 if (ent) { 2488 __grp_src_mod_timer(ent, 2489 now + br_multicast_gmi(brmctx)); 2490 changed = true; 2491 } 2492 } 2493 } 2494 2495 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2496 grec_type)) 2497 changed = true; 2498 2499 if (__grp_src_delete_marked(pg)) 2500 changed = true; 2501 2502 return changed; 2503 } 2504 2505 static bool br_multicast_isexc(const struct net_bridge_mcast *brmctx, 2506 struct net_bridge_port_group *pg, void *h_addr, 2507 void *srcs, u32 nsrcs, size_t addr_size, 2508 int grec_type) 2509 { 2510 bool changed = false; 2511 2512 switch (pg->filter_mode) { 2513 case MCAST_INCLUDE: 2514 __grp_src_isexc_incl(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2515 grec_type); 2516 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE); 2517 changed = true; 2518 break; 2519 case MCAST_EXCLUDE: 2520 changed = __grp_src_isexc_excl(brmctx, pg, h_addr, srcs, nsrcs, 2521 addr_size, grec_type); 2522 break; 2523 } 2524 2525 pg->filter_mode = MCAST_EXCLUDE; 2526 mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx)); 2527 2528 return changed; 2529 } 2530 2531 /* State Msg type New state Actions 2532 * INCLUDE (A) TO_IN (B) INCLUDE (A+B) (B)=GMI 2533 * Send Q(G,A-B) 2534 */ 2535 static bool __grp_src_toin_incl(struct net_bridge_mcast *brmctx, 2536 struct net_bridge_mcast_port *pmctx, 2537 struct net_bridge_port_group *pg, void *h_addr, 2538 void *srcs, u32 nsrcs, size_t addr_size, 2539 int grec_type) 2540 { 2541 u32 src_idx, to_send = pg->src_ents; 2542 struct net_bridge_group_src *ent; 2543 unsigned long now = jiffies; 2544 bool changed = false; 2545 struct br_ip src_ip; 2546 2547 hlist_for_each_entry(ent, &pg->src_list, node) 2548 ent->flags |= BR_SGRP_F_SEND; 2549 2550 memset(&src_ip, 0, sizeof(src_ip)); 2551 src_ip.proto = pg->key.addr.proto; 2552 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2553 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2554 ent = br_multicast_find_group_src(pg, &src_ip); 2555 if (ent) { 2556 ent->flags &= ~BR_SGRP_F_SEND; 2557 to_send--; 2558 } else { 2559 ent = br_multicast_new_group_src(pg, &src_ip); 2560 if (ent) 2561 changed = true; 2562 } 2563 if (ent) 2564 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx)); 2565 } 2566 2567 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2568 grec_type)) 2569 changed = true; 2570 2571 if (to_send) 2572 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2573 2574 return changed; 2575 } 2576 2577 /* State Msg type New state Actions 2578 * EXCLUDE (X,Y) TO_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI 2579 * Send Q(G,X-A) 2580 * Send Q(G) 2581 */ 2582 static bool __grp_src_toin_excl(struct net_bridge_mcast *brmctx, 2583 struct net_bridge_mcast_port *pmctx, 2584 struct net_bridge_port_group *pg, void *h_addr, 2585 void *srcs, u32 nsrcs, size_t addr_size, 2586 int grec_type) 2587 { 2588 u32 src_idx, to_send = pg->src_ents; 2589 struct net_bridge_group_src *ent; 2590 unsigned long now = jiffies; 2591 bool changed = false; 2592 struct br_ip src_ip; 2593 2594 hlist_for_each_entry(ent, &pg->src_list, node) 2595 if (timer_pending(&ent->timer)) 2596 ent->flags |= BR_SGRP_F_SEND; 2597 2598 memset(&src_ip, 0, sizeof(src_ip)); 2599 src_ip.proto = pg->key.addr.proto; 2600 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2601 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2602 ent = br_multicast_find_group_src(pg, &src_ip); 2603 if (ent) { 2604 if (timer_pending(&ent->timer)) { 2605 ent->flags &= ~BR_SGRP_F_SEND; 2606 to_send--; 2607 } 2608 } else { 2609 ent = br_multicast_new_group_src(pg, &src_ip); 2610 if (ent) 2611 changed = true; 2612 } 2613 if (ent) 2614 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx)); 2615 } 2616 2617 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2618 grec_type)) 2619 changed = true; 2620 2621 if (to_send) 2622 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2623 2624 __grp_send_query_and_rexmit(brmctx, pmctx, pg); 2625 2626 return changed; 2627 } 2628 2629 static bool br_multicast_toin(struct net_bridge_mcast *brmctx, 2630 struct net_bridge_mcast_port *pmctx, 2631 struct net_bridge_port_group *pg, void *h_addr, 2632 void *srcs, u32 nsrcs, size_t addr_size, 2633 int grec_type) 2634 { 2635 bool changed = false; 2636 2637 switch (pg->filter_mode) { 2638 case MCAST_INCLUDE: 2639 changed = __grp_src_toin_incl(brmctx, pmctx, pg, h_addr, srcs, 2640 nsrcs, addr_size, grec_type); 2641 break; 2642 case MCAST_EXCLUDE: 2643 changed = __grp_src_toin_excl(brmctx, pmctx, pg, h_addr, srcs, 2644 nsrcs, addr_size, grec_type); 2645 break; 2646 } 2647 2648 if (br_multicast_eht_should_del_pg(pg)) { 2649 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE; 2650 br_multicast_find_del_pg(pg->key.port->br, pg); 2651 /* a notification has already been sent and we shouldn't 2652 * access pg after the delete so we have to return false 2653 */ 2654 changed = false; 2655 } 2656 2657 return changed; 2658 } 2659 2660 /* State Msg type New state Actions 2661 * INCLUDE (A) TO_EX (B) EXCLUDE (A*B,B-A) (B-A)=0 2662 * Delete (A-B) 2663 * Send Q(G,A*B) 2664 * Group Timer=GMI 2665 */ 2666 static void __grp_src_toex_incl(struct net_bridge_mcast *brmctx, 2667 struct net_bridge_mcast_port *pmctx, 2668 struct net_bridge_port_group *pg, void *h_addr, 2669 void *srcs, u32 nsrcs, size_t addr_size, 2670 int grec_type) 2671 { 2672 struct net_bridge_group_src *ent; 2673 u32 src_idx, to_send = 0; 2674 struct br_ip src_ip; 2675 2676 hlist_for_each_entry(ent, &pg->src_list, node) 2677 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE; 2678 2679 memset(&src_ip, 0, sizeof(src_ip)); 2680 src_ip.proto = pg->key.addr.proto; 2681 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2682 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2683 ent = br_multicast_find_group_src(pg, &src_ip); 2684 if (ent) { 2685 ent->flags = (ent->flags & ~BR_SGRP_F_DELETE) | 2686 BR_SGRP_F_SEND; 2687 to_send++; 2688 } else { 2689 ent = br_multicast_new_group_src(pg, &src_ip); 2690 } 2691 if (ent) 2692 br_multicast_fwd_src_handle(ent); 2693 } 2694 2695 br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2696 grec_type); 2697 2698 __grp_src_delete_marked(pg); 2699 if (to_send) 2700 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2701 } 2702 2703 /* State Msg type New state Actions 2704 * EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=Group Timer 2705 * Delete (X-A) 2706 * Delete (Y-A) 2707 * Send Q(G,A-Y) 2708 * Group Timer=GMI 2709 */ 2710 static bool __grp_src_toex_excl(struct net_bridge_mcast *brmctx, 2711 struct net_bridge_mcast_port *pmctx, 2712 struct net_bridge_port_group *pg, void *h_addr, 2713 void *srcs, u32 nsrcs, size_t addr_size, 2714 int grec_type) 2715 { 2716 struct net_bridge_group_src *ent; 2717 u32 src_idx, to_send = 0; 2718 bool changed = false; 2719 struct br_ip src_ip; 2720 2721 hlist_for_each_entry(ent, &pg->src_list, node) 2722 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE; 2723 2724 memset(&src_ip, 0, sizeof(src_ip)); 2725 src_ip.proto = pg->key.addr.proto; 2726 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2727 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2728 ent = br_multicast_find_group_src(pg, &src_ip); 2729 if (ent) { 2730 ent->flags &= ~BR_SGRP_F_DELETE; 2731 } else { 2732 ent = br_multicast_new_group_src(pg, &src_ip); 2733 if (ent) { 2734 __grp_src_mod_timer(ent, pg->timer.expires); 2735 changed = true; 2736 } 2737 } 2738 if (ent && timer_pending(&ent->timer)) { 2739 ent->flags |= BR_SGRP_F_SEND; 2740 to_send++; 2741 } 2742 } 2743 2744 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2745 grec_type)) 2746 changed = true; 2747 2748 if (__grp_src_delete_marked(pg)) 2749 changed = true; 2750 if (to_send) 2751 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2752 2753 return changed; 2754 } 2755 2756 static bool br_multicast_toex(struct net_bridge_mcast *brmctx, 2757 struct net_bridge_mcast_port *pmctx, 2758 struct net_bridge_port_group *pg, void *h_addr, 2759 void *srcs, u32 nsrcs, size_t addr_size, 2760 int grec_type) 2761 { 2762 bool changed = false; 2763 2764 switch (pg->filter_mode) { 2765 case MCAST_INCLUDE: 2766 __grp_src_toex_incl(brmctx, pmctx, pg, h_addr, srcs, nsrcs, 2767 addr_size, grec_type); 2768 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE); 2769 changed = true; 2770 break; 2771 case MCAST_EXCLUDE: 2772 changed = __grp_src_toex_excl(brmctx, pmctx, pg, h_addr, srcs, 2773 nsrcs, addr_size, grec_type); 2774 break; 2775 } 2776 2777 pg->filter_mode = MCAST_EXCLUDE; 2778 mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx)); 2779 2780 return changed; 2781 } 2782 2783 /* State Msg type New state Actions 2784 * INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B) 2785 */ 2786 static bool __grp_src_block_incl(struct net_bridge_mcast *brmctx, 2787 struct net_bridge_mcast_port *pmctx, 2788 struct net_bridge_port_group *pg, void *h_addr, 2789 void *srcs, u32 nsrcs, size_t addr_size, int grec_type) 2790 { 2791 struct net_bridge_group_src *ent; 2792 u32 src_idx, to_send = 0; 2793 bool changed = false; 2794 struct br_ip src_ip; 2795 2796 hlist_for_each_entry(ent, &pg->src_list, node) 2797 ent->flags &= ~BR_SGRP_F_SEND; 2798 2799 memset(&src_ip, 0, sizeof(src_ip)); 2800 src_ip.proto = pg->key.addr.proto; 2801 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2802 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2803 ent = br_multicast_find_group_src(pg, &src_ip); 2804 if (ent) { 2805 ent->flags |= BR_SGRP_F_SEND; 2806 to_send++; 2807 } 2808 } 2809 2810 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2811 grec_type)) 2812 changed = true; 2813 2814 if (to_send) 2815 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2816 2817 return changed; 2818 } 2819 2820 /* State Msg type New state Actions 2821 * EXCLUDE (X,Y) BLOCK (A) EXCLUDE (X+(A-Y),Y) (A-X-Y)=Group Timer 2822 * Send Q(G,A-Y) 2823 */ 2824 static bool __grp_src_block_excl(struct net_bridge_mcast *brmctx, 2825 struct net_bridge_mcast_port *pmctx, 2826 struct net_bridge_port_group *pg, void *h_addr, 2827 void *srcs, u32 nsrcs, size_t addr_size, int grec_type) 2828 { 2829 struct net_bridge_group_src *ent; 2830 u32 src_idx, to_send = 0; 2831 bool changed = false; 2832 struct br_ip src_ip; 2833 2834 hlist_for_each_entry(ent, &pg->src_list, node) 2835 ent->flags &= ~BR_SGRP_F_SEND; 2836 2837 memset(&src_ip, 0, sizeof(src_ip)); 2838 src_ip.proto = pg->key.addr.proto; 2839 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2840 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2841 ent = br_multicast_find_group_src(pg, &src_ip); 2842 if (!ent) { 2843 ent = br_multicast_new_group_src(pg, &src_ip); 2844 if (ent) { 2845 __grp_src_mod_timer(ent, pg->timer.expires); 2846 changed = true; 2847 } 2848 } 2849 if (ent && timer_pending(&ent->timer)) { 2850 ent->flags |= BR_SGRP_F_SEND; 2851 to_send++; 2852 } 2853 } 2854 2855 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2856 grec_type)) 2857 changed = true; 2858 2859 if (to_send) 2860 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2861 2862 return changed; 2863 } 2864 2865 static bool br_multicast_block(struct net_bridge_mcast *brmctx, 2866 struct net_bridge_mcast_port *pmctx, 2867 struct net_bridge_port_group *pg, void *h_addr, 2868 void *srcs, u32 nsrcs, size_t addr_size, int grec_type) 2869 { 2870 bool changed = false; 2871 2872 switch (pg->filter_mode) { 2873 case MCAST_INCLUDE: 2874 changed = __grp_src_block_incl(brmctx, pmctx, pg, h_addr, srcs, 2875 nsrcs, addr_size, grec_type); 2876 break; 2877 case MCAST_EXCLUDE: 2878 changed = __grp_src_block_excl(brmctx, pmctx, pg, h_addr, srcs, 2879 nsrcs, addr_size, grec_type); 2880 break; 2881 } 2882 2883 if ((pg->filter_mode == MCAST_INCLUDE && hlist_empty(&pg->src_list)) || 2884 br_multicast_eht_should_del_pg(pg)) { 2885 if (br_multicast_eht_should_del_pg(pg)) 2886 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE; 2887 br_multicast_find_del_pg(pg->key.port->br, pg); 2888 /* a notification has already been sent and we shouldn't 2889 * access pg after the delete so we have to return false 2890 */ 2891 changed = false; 2892 } 2893 2894 return changed; 2895 } 2896 2897 static struct net_bridge_port_group * 2898 br_multicast_find_port(struct net_bridge_mdb_entry *mp, 2899 struct net_bridge_port *p, 2900 const unsigned char *src) 2901 { 2902 struct net_bridge *br __maybe_unused = mp->br; 2903 struct net_bridge_port_group *pg; 2904 2905 for (pg = mlock_dereference(mp->ports, br); 2906 pg; 2907 pg = mlock_dereference(pg->next, br)) 2908 if (br_port_group_equal(pg, p, src)) 2909 return pg; 2910 2911 return NULL; 2912 } 2913 2914 static int br_ip4_multicast_igmp3_report(struct net_bridge_mcast *brmctx, 2915 struct net_bridge_mcast_port *pmctx, 2916 struct sk_buff *skb, 2917 u16 vid) 2918 { 2919 bool igmpv2 = brmctx->multicast_igmp_version == 2; 2920 struct net_bridge_mdb_entry *mdst; 2921 struct net_bridge_port_group *pg; 2922 const unsigned char *src; 2923 struct igmpv3_report *ih; 2924 struct igmpv3_grec *grec; 2925 int i, len, num, type; 2926 __be32 group, *h_addr; 2927 bool changed = false; 2928 int err = 0; 2929 u16 nsrcs; 2930 2931 ih = igmpv3_report_hdr(skb); 2932 num = ntohs(ih->ngrec); 2933 len = skb_transport_offset(skb) + sizeof(*ih); 2934 2935 for (i = 0; i < num; i++) { 2936 len += sizeof(*grec); 2937 if (!ip_mc_may_pull(skb, len)) 2938 return -EINVAL; 2939 2940 grec = (void *)(skb->data + len - sizeof(*grec)); 2941 group = grec->grec_mca; 2942 type = grec->grec_type; 2943 nsrcs = ntohs(grec->grec_nsrcs); 2944 2945 len += nsrcs * 4; 2946 if (!ip_mc_may_pull(skb, len)) 2947 return -EINVAL; 2948 2949 switch (type) { 2950 case IGMPV3_MODE_IS_INCLUDE: 2951 case IGMPV3_MODE_IS_EXCLUDE: 2952 case IGMPV3_CHANGE_TO_INCLUDE: 2953 case IGMPV3_CHANGE_TO_EXCLUDE: 2954 case IGMPV3_ALLOW_NEW_SOURCES: 2955 case IGMPV3_BLOCK_OLD_SOURCES: 2956 break; 2957 2958 default: 2959 continue; 2960 } 2961 2962 src = eth_hdr(skb)->h_source; 2963 if (nsrcs == 0 && 2964 (type == IGMPV3_CHANGE_TO_INCLUDE || 2965 type == IGMPV3_MODE_IS_INCLUDE)) { 2966 if (!pmctx || igmpv2) { 2967 br_ip4_multicast_leave_group(brmctx, pmctx, 2968 group, vid, src); 2969 continue; 2970 } 2971 } else { 2972 err = br_ip4_multicast_add_group(brmctx, pmctx, group, 2973 vid, src, igmpv2); 2974 if (err) 2975 break; 2976 } 2977 2978 if (!pmctx || igmpv2) 2979 continue; 2980 2981 spin_lock(&brmctx->br->multicast_lock); 2982 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 2983 goto unlock_continue; 2984 2985 mdst = br_mdb_ip4_get(brmctx->br, group, vid); 2986 if (!mdst) 2987 goto unlock_continue; 2988 pg = br_multicast_find_port(mdst, pmctx->port, src); 2989 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT)) 2990 goto unlock_continue; 2991 /* reload grec and host addr */ 2992 grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4)); 2993 h_addr = &ip_hdr(skb)->saddr; 2994 switch (type) { 2995 case IGMPV3_ALLOW_NEW_SOURCES: 2996 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 2997 grec->grec_src, 2998 nsrcs, sizeof(__be32), type); 2999 break; 3000 case IGMPV3_MODE_IS_INCLUDE: 3001 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 3002 grec->grec_src, 3003 nsrcs, sizeof(__be32), type); 3004 break; 3005 case IGMPV3_MODE_IS_EXCLUDE: 3006 changed = br_multicast_isexc(brmctx, pg, h_addr, 3007 grec->grec_src, 3008 nsrcs, sizeof(__be32), type); 3009 break; 3010 case IGMPV3_CHANGE_TO_INCLUDE: 3011 changed = br_multicast_toin(brmctx, pmctx, pg, h_addr, 3012 grec->grec_src, 3013 nsrcs, sizeof(__be32), type); 3014 break; 3015 case IGMPV3_CHANGE_TO_EXCLUDE: 3016 changed = br_multicast_toex(brmctx, pmctx, pg, h_addr, 3017 grec->grec_src, 3018 nsrcs, sizeof(__be32), type); 3019 break; 3020 case IGMPV3_BLOCK_OLD_SOURCES: 3021 changed = br_multicast_block(brmctx, pmctx, pg, h_addr, 3022 grec->grec_src, 3023 nsrcs, sizeof(__be32), type); 3024 break; 3025 } 3026 if (changed) 3027 br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB); 3028 unlock_continue: 3029 spin_unlock(&brmctx->br->multicast_lock); 3030 } 3031 3032 return err; 3033 } 3034 3035 #if IS_ENABLED(CONFIG_IPV6) 3036 static int br_ip6_multicast_mld2_report(struct net_bridge_mcast *brmctx, 3037 struct net_bridge_mcast_port *pmctx, 3038 struct sk_buff *skb, 3039 u16 vid) 3040 { 3041 bool mldv1 = brmctx->multicast_mld_version == 1; 3042 struct net_bridge_mdb_entry *mdst; 3043 struct net_bridge_port_group *pg; 3044 unsigned int nsrcs_offset; 3045 struct mld2_report *mld2r; 3046 const unsigned char *src; 3047 struct in6_addr *h_addr; 3048 struct mld2_grec *grec; 3049 unsigned int grec_len; 3050 bool changed = false; 3051 int i, len, num; 3052 int err = 0; 3053 3054 if (!ipv6_mc_may_pull(skb, sizeof(*mld2r))) 3055 return -EINVAL; 3056 3057 mld2r = (struct mld2_report *)icmp6_hdr(skb); 3058 num = ntohs(mld2r->mld2r_ngrec); 3059 len = skb_transport_offset(skb) + sizeof(*mld2r); 3060 3061 for (i = 0; i < num; i++) { 3062 __be16 *_nsrcs, __nsrcs; 3063 u16 nsrcs; 3064 3065 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs); 3066 3067 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < 3068 nsrcs_offset + sizeof(__nsrcs)) 3069 return -EINVAL; 3070 3071 _nsrcs = skb_header_pointer(skb, nsrcs_offset, 3072 sizeof(__nsrcs), &__nsrcs); 3073 if (!_nsrcs) 3074 return -EINVAL; 3075 3076 nsrcs = ntohs(*_nsrcs); 3077 grec_len = struct_size(grec, grec_src, nsrcs); 3078 3079 if (!ipv6_mc_may_pull(skb, len + grec_len)) 3080 return -EINVAL; 3081 3082 grec = (struct mld2_grec *)(skb->data + len); 3083 len += grec_len; 3084 3085 switch (grec->grec_type) { 3086 case MLD2_MODE_IS_INCLUDE: 3087 case MLD2_MODE_IS_EXCLUDE: 3088 case MLD2_CHANGE_TO_INCLUDE: 3089 case MLD2_CHANGE_TO_EXCLUDE: 3090 case MLD2_ALLOW_NEW_SOURCES: 3091 case MLD2_BLOCK_OLD_SOURCES: 3092 break; 3093 3094 default: 3095 continue; 3096 } 3097 3098 src = eth_hdr(skb)->h_source; 3099 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE || 3100 grec->grec_type == MLD2_MODE_IS_INCLUDE) && 3101 nsrcs == 0) { 3102 if (!pmctx || mldv1) { 3103 br_ip6_multicast_leave_group(brmctx, pmctx, 3104 &grec->grec_mca, 3105 vid, src); 3106 continue; 3107 } 3108 } else { 3109 err = br_ip6_multicast_add_group(brmctx, pmctx, 3110 &grec->grec_mca, vid, 3111 src, mldv1); 3112 if (err) 3113 break; 3114 } 3115 3116 if (!pmctx || mldv1) 3117 continue; 3118 3119 spin_lock(&brmctx->br->multicast_lock); 3120 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3121 goto unlock_continue; 3122 3123 mdst = br_mdb_ip6_get(brmctx->br, &grec->grec_mca, vid); 3124 if (!mdst) 3125 goto unlock_continue; 3126 pg = br_multicast_find_port(mdst, pmctx->port, src); 3127 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT)) 3128 goto unlock_continue; 3129 h_addr = &ipv6_hdr(skb)->saddr; 3130 switch (grec->grec_type) { 3131 case MLD2_ALLOW_NEW_SOURCES: 3132 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 3133 grec->grec_src, nsrcs, 3134 sizeof(struct in6_addr), 3135 grec->grec_type); 3136 break; 3137 case MLD2_MODE_IS_INCLUDE: 3138 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 3139 grec->grec_src, nsrcs, 3140 sizeof(struct in6_addr), 3141 grec->grec_type); 3142 break; 3143 case MLD2_MODE_IS_EXCLUDE: 3144 changed = br_multicast_isexc(brmctx, pg, h_addr, 3145 grec->grec_src, nsrcs, 3146 sizeof(struct in6_addr), 3147 grec->grec_type); 3148 break; 3149 case MLD2_CHANGE_TO_INCLUDE: 3150 changed = br_multicast_toin(brmctx, pmctx, pg, h_addr, 3151 grec->grec_src, nsrcs, 3152 sizeof(struct in6_addr), 3153 grec->grec_type); 3154 break; 3155 case MLD2_CHANGE_TO_EXCLUDE: 3156 changed = br_multicast_toex(brmctx, pmctx, pg, h_addr, 3157 grec->grec_src, nsrcs, 3158 sizeof(struct in6_addr), 3159 grec->grec_type); 3160 break; 3161 case MLD2_BLOCK_OLD_SOURCES: 3162 changed = br_multicast_block(brmctx, pmctx, pg, h_addr, 3163 grec->grec_src, nsrcs, 3164 sizeof(struct in6_addr), 3165 grec->grec_type); 3166 break; 3167 } 3168 if (changed) 3169 br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB); 3170 unlock_continue: 3171 spin_unlock(&brmctx->br->multicast_lock); 3172 } 3173 3174 return err; 3175 } 3176 #endif 3177 3178 static bool br_multicast_select_querier(struct net_bridge_mcast *brmctx, 3179 struct net_bridge_mcast_port *pmctx, 3180 struct br_ip *saddr) 3181 { 3182 int port_ifidx = pmctx ? pmctx->port->dev->ifindex : 0; 3183 struct timer_list *own_timer, *other_timer; 3184 struct bridge_mcast_querier *querier; 3185 3186 switch (saddr->proto) { 3187 case htons(ETH_P_IP): 3188 querier = &brmctx->ip4_querier; 3189 own_timer = &brmctx->ip4_own_query.timer; 3190 other_timer = &brmctx->ip4_other_query.timer; 3191 if (!querier->addr.src.ip4 || 3192 ntohl(saddr->src.ip4) <= ntohl(querier->addr.src.ip4)) 3193 goto update; 3194 break; 3195 #if IS_ENABLED(CONFIG_IPV6) 3196 case htons(ETH_P_IPV6): 3197 querier = &brmctx->ip6_querier; 3198 own_timer = &brmctx->ip6_own_query.timer; 3199 other_timer = &brmctx->ip6_other_query.timer; 3200 if (ipv6_addr_cmp(&saddr->src.ip6, &querier->addr.src.ip6) <= 0) 3201 goto update; 3202 break; 3203 #endif 3204 default: 3205 return false; 3206 } 3207 3208 if (!timer_pending(own_timer) && !timer_pending(other_timer)) 3209 goto update; 3210 3211 return false; 3212 3213 update: 3214 br_multicast_update_querier(brmctx, querier, port_ifidx, saddr); 3215 3216 return true; 3217 } 3218 3219 static struct net_bridge_port * 3220 __br_multicast_get_querier_port(struct net_bridge *br, 3221 const struct bridge_mcast_querier *querier) 3222 { 3223 int port_ifidx = READ_ONCE(querier->port_ifidx); 3224 struct net_bridge_port *p; 3225 struct net_device *dev; 3226 3227 if (port_ifidx == 0) 3228 return NULL; 3229 3230 dev = dev_get_by_index_rcu(dev_net(br->dev), port_ifidx); 3231 if (!dev) 3232 return NULL; 3233 p = br_port_get_rtnl_rcu(dev); 3234 if (!p || p->br != br) 3235 return NULL; 3236 3237 return p; 3238 } 3239 3240 size_t br_multicast_querier_state_size(void) 3241 { 3242 return nla_total_size(0) + /* nest attribute */ 3243 nla_total_size(sizeof(__be32)) + /* BRIDGE_QUERIER_IP_ADDRESS */ 3244 nla_total_size(sizeof(int)) + /* BRIDGE_QUERIER_IP_PORT */ 3245 nla_total_size_64bit(sizeof(u64)) + /* BRIDGE_QUERIER_IP_OTHER_TIMER */ 3246 #if IS_ENABLED(CONFIG_IPV6) 3247 nla_total_size(sizeof(struct in6_addr)) + /* BRIDGE_QUERIER_IPV6_ADDRESS */ 3248 nla_total_size(sizeof(int)) + /* BRIDGE_QUERIER_IPV6_PORT */ 3249 nla_total_size_64bit(sizeof(u64)) + /* BRIDGE_QUERIER_IPV6_OTHER_TIMER */ 3250 #endif 3251 0; 3252 } 3253 3254 /* protected by rtnl or rcu */ 3255 int br_multicast_dump_querier_state(struct sk_buff *skb, 3256 const struct net_bridge_mcast *brmctx, 3257 int nest_attr) 3258 { 3259 struct bridge_mcast_querier querier = {}; 3260 struct net_bridge_port *p; 3261 struct nlattr *nest; 3262 3263 if (!br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) || 3264 br_multicast_ctx_vlan_global_disabled(brmctx)) 3265 return 0; 3266 3267 nest = nla_nest_start(skb, nest_attr); 3268 if (!nest) 3269 return -EMSGSIZE; 3270 3271 rcu_read_lock(); 3272 if (!brmctx->multicast_querier && 3273 !timer_pending(&brmctx->ip4_other_query.timer)) 3274 goto out_v6; 3275 3276 br_multicast_read_querier(&brmctx->ip4_querier, &querier); 3277 if (nla_put_in_addr(skb, BRIDGE_QUERIER_IP_ADDRESS, 3278 querier.addr.src.ip4)) { 3279 rcu_read_unlock(); 3280 goto out_err; 3281 } 3282 3283 p = __br_multicast_get_querier_port(brmctx->br, &querier); 3284 if (timer_pending(&brmctx->ip4_other_query.timer) && 3285 (nla_put_u64_64bit(skb, BRIDGE_QUERIER_IP_OTHER_TIMER, 3286 br_timer_value(&brmctx->ip4_other_query.timer), 3287 BRIDGE_QUERIER_PAD) || 3288 (p && nla_put_u32(skb, BRIDGE_QUERIER_IP_PORT, p->dev->ifindex)))) { 3289 rcu_read_unlock(); 3290 goto out_err; 3291 } 3292 3293 out_v6: 3294 #if IS_ENABLED(CONFIG_IPV6) 3295 if (!brmctx->multicast_querier && 3296 !timer_pending(&brmctx->ip6_other_query.timer)) 3297 goto out; 3298 3299 br_multicast_read_querier(&brmctx->ip6_querier, &querier); 3300 if (nla_put_in6_addr(skb, BRIDGE_QUERIER_IPV6_ADDRESS, 3301 &querier.addr.src.ip6)) { 3302 rcu_read_unlock(); 3303 goto out_err; 3304 } 3305 3306 p = __br_multicast_get_querier_port(brmctx->br, &querier); 3307 if (timer_pending(&brmctx->ip6_other_query.timer) && 3308 (nla_put_u64_64bit(skb, BRIDGE_QUERIER_IPV6_OTHER_TIMER, 3309 br_timer_value(&brmctx->ip6_other_query.timer), 3310 BRIDGE_QUERIER_PAD) || 3311 (p && nla_put_u32(skb, BRIDGE_QUERIER_IPV6_PORT, 3312 p->dev->ifindex)))) { 3313 rcu_read_unlock(); 3314 goto out_err; 3315 } 3316 out: 3317 #endif 3318 rcu_read_unlock(); 3319 nla_nest_end(skb, nest); 3320 if (!nla_len(nest)) 3321 nla_nest_cancel(skb, nest); 3322 3323 return 0; 3324 3325 out_err: 3326 nla_nest_cancel(skb, nest); 3327 return -EMSGSIZE; 3328 } 3329 3330 static void 3331 br_multicast_update_query_timer(struct net_bridge_mcast *brmctx, 3332 struct bridge_mcast_other_query *query, 3333 unsigned long max_delay) 3334 { 3335 if (!timer_pending(&query->timer)) 3336 mod_timer(&query->delay_timer, jiffies + max_delay); 3337 3338 mod_timer(&query->timer, jiffies + brmctx->multicast_querier_interval); 3339 } 3340 3341 static void br_port_mc_router_state_change(struct net_bridge_port *p, 3342 bool is_mc_router) 3343 { 3344 struct switchdev_attr attr = { 3345 .orig_dev = p->dev, 3346 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER, 3347 .flags = SWITCHDEV_F_DEFER, 3348 .u.mrouter = is_mc_router, 3349 }; 3350 3351 switchdev_port_attr_set(p->dev, &attr, NULL); 3352 } 3353 3354 static struct net_bridge_port * 3355 br_multicast_rport_from_node(struct net_bridge_mcast *brmctx, 3356 struct hlist_head *mc_router_list, 3357 struct hlist_node *rlist) 3358 { 3359 struct net_bridge_mcast_port *pmctx; 3360 3361 #if IS_ENABLED(CONFIG_IPV6) 3362 if (mc_router_list == &brmctx->ip6_mc_router_list) 3363 pmctx = hlist_entry(rlist, struct net_bridge_mcast_port, 3364 ip6_rlist); 3365 else 3366 #endif 3367 pmctx = hlist_entry(rlist, struct net_bridge_mcast_port, 3368 ip4_rlist); 3369 3370 return pmctx->port; 3371 } 3372 3373 static struct hlist_node * 3374 br_multicast_get_rport_slot(struct net_bridge_mcast *brmctx, 3375 struct net_bridge_port *port, 3376 struct hlist_head *mc_router_list) 3377 3378 { 3379 struct hlist_node *slot = NULL; 3380 struct net_bridge_port *p; 3381 struct hlist_node *rlist; 3382 3383 hlist_for_each(rlist, mc_router_list) { 3384 p = br_multicast_rport_from_node(brmctx, mc_router_list, rlist); 3385 3386 if ((unsigned long)port >= (unsigned long)p) 3387 break; 3388 3389 slot = rlist; 3390 } 3391 3392 return slot; 3393 } 3394 3395 static bool br_multicast_no_router_otherpf(struct net_bridge_mcast_port *pmctx, 3396 struct hlist_node *rnode) 3397 { 3398 #if IS_ENABLED(CONFIG_IPV6) 3399 if (rnode != &pmctx->ip6_rlist) 3400 return hlist_unhashed(&pmctx->ip6_rlist); 3401 else 3402 return hlist_unhashed(&pmctx->ip4_rlist); 3403 #else 3404 return true; 3405 #endif 3406 } 3407 3408 /* Add port to router_list 3409 * list is maintained ordered by pointer value 3410 * and locked by br->multicast_lock and RCU 3411 */ 3412 static void br_multicast_add_router(struct net_bridge_mcast *brmctx, 3413 struct net_bridge_mcast_port *pmctx, 3414 struct hlist_node *rlist, 3415 struct hlist_head *mc_router_list) 3416 { 3417 struct hlist_node *slot; 3418 3419 if (!hlist_unhashed(rlist)) 3420 return; 3421 3422 slot = br_multicast_get_rport_slot(brmctx, pmctx->port, mc_router_list); 3423 3424 if (slot) 3425 hlist_add_behind_rcu(rlist, slot); 3426 else 3427 hlist_add_head_rcu(rlist, mc_router_list); 3428 3429 /* For backwards compatibility for now, only notify if we 3430 * switched from no IPv4/IPv6 multicast router to a new 3431 * IPv4 or IPv6 multicast router. 3432 */ 3433 if (br_multicast_no_router_otherpf(pmctx, rlist)) { 3434 br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_NEWMDB); 3435 br_port_mc_router_state_change(pmctx->port, true); 3436 } 3437 } 3438 3439 /* Add port to router_list 3440 * list is maintained ordered by pointer value 3441 * and locked by br->multicast_lock and RCU 3442 */ 3443 static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx, 3444 struct net_bridge_mcast_port *pmctx) 3445 { 3446 br_multicast_add_router(brmctx, pmctx, &pmctx->ip4_rlist, 3447 &brmctx->ip4_mc_router_list); 3448 } 3449 3450 /* Add port to router_list 3451 * list is maintained ordered by pointer value 3452 * and locked by br->multicast_lock and RCU 3453 */ 3454 static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx, 3455 struct net_bridge_mcast_port *pmctx) 3456 { 3457 #if IS_ENABLED(CONFIG_IPV6) 3458 br_multicast_add_router(brmctx, pmctx, &pmctx->ip6_rlist, 3459 &brmctx->ip6_mc_router_list); 3460 #endif 3461 } 3462 3463 static void br_multicast_mark_router(struct net_bridge_mcast *brmctx, 3464 struct net_bridge_mcast_port *pmctx, 3465 struct timer_list *timer, 3466 struct hlist_node *rlist, 3467 struct hlist_head *mc_router_list) 3468 { 3469 unsigned long now = jiffies; 3470 3471 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3472 return; 3473 3474 if (!pmctx) { 3475 if (brmctx->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) { 3476 if (!br_ip4_multicast_is_router(brmctx) && 3477 !br_ip6_multicast_is_router(brmctx)) 3478 br_mc_router_state_change(brmctx->br, true); 3479 mod_timer(timer, now + brmctx->multicast_querier_interval); 3480 } 3481 return; 3482 } 3483 3484 if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED || 3485 pmctx->multicast_router == MDB_RTR_TYPE_PERM) 3486 return; 3487 3488 br_multicast_add_router(brmctx, pmctx, rlist, mc_router_list); 3489 mod_timer(timer, now + brmctx->multicast_querier_interval); 3490 } 3491 3492 static void br_ip4_multicast_mark_router(struct net_bridge_mcast *brmctx, 3493 struct net_bridge_mcast_port *pmctx) 3494 { 3495 struct timer_list *timer = &brmctx->ip4_mc_router_timer; 3496 struct hlist_node *rlist = NULL; 3497 3498 if (pmctx) { 3499 timer = &pmctx->ip4_mc_router_timer; 3500 rlist = &pmctx->ip4_rlist; 3501 } 3502 3503 br_multicast_mark_router(brmctx, pmctx, timer, rlist, 3504 &brmctx->ip4_mc_router_list); 3505 } 3506 3507 static void br_ip6_multicast_mark_router(struct net_bridge_mcast *brmctx, 3508 struct net_bridge_mcast_port *pmctx) 3509 { 3510 #if IS_ENABLED(CONFIG_IPV6) 3511 struct timer_list *timer = &brmctx->ip6_mc_router_timer; 3512 struct hlist_node *rlist = NULL; 3513 3514 if (pmctx) { 3515 timer = &pmctx->ip6_mc_router_timer; 3516 rlist = &pmctx->ip6_rlist; 3517 } 3518 3519 br_multicast_mark_router(brmctx, pmctx, timer, rlist, 3520 &brmctx->ip6_mc_router_list); 3521 #endif 3522 } 3523 3524 static void 3525 br_ip4_multicast_query_received(struct net_bridge_mcast *brmctx, 3526 struct net_bridge_mcast_port *pmctx, 3527 struct bridge_mcast_other_query *query, 3528 struct br_ip *saddr, 3529 unsigned long max_delay) 3530 { 3531 if (!br_multicast_select_querier(brmctx, pmctx, saddr)) 3532 return; 3533 3534 br_multicast_update_query_timer(brmctx, query, max_delay); 3535 br_ip4_multicast_mark_router(brmctx, pmctx); 3536 } 3537 3538 #if IS_ENABLED(CONFIG_IPV6) 3539 static void 3540 br_ip6_multicast_query_received(struct net_bridge_mcast *brmctx, 3541 struct net_bridge_mcast_port *pmctx, 3542 struct bridge_mcast_other_query *query, 3543 struct br_ip *saddr, 3544 unsigned long max_delay) 3545 { 3546 if (!br_multicast_select_querier(brmctx, pmctx, saddr)) 3547 return; 3548 3549 br_multicast_update_query_timer(brmctx, query, max_delay); 3550 br_ip6_multicast_mark_router(brmctx, pmctx); 3551 } 3552 #endif 3553 3554 static void br_ip4_multicast_query(struct net_bridge_mcast *brmctx, 3555 struct net_bridge_mcast_port *pmctx, 3556 struct sk_buff *skb, 3557 u16 vid) 3558 { 3559 unsigned int transport_len = ip_transport_len(skb); 3560 const struct iphdr *iph = ip_hdr(skb); 3561 struct igmphdr *ih = igmp_hdr(skb); 3562 struct net_bridge_mdb_entry *mp; 3563 struct igmpv3_query *ih3; 3564 struct net_bridge_port_group *p; 3565 struct net_bridge_port_group __rcu **pp; 3566 struct br_ip saddr = {}; 3567 unsigned long max_delay; 3568 unsigned long now = jiffies; 3569 __be32 group; 3570 3571 spin_lock(&brmctx->br->multicast_lock); 3572 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3573 goto out; 3574 3575 group = ih->group; 3576 3577 if (transport_len == sizeof(*ih)) { 3578 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 3579 3580 if (!max_delay) { 3581 max_delay = 10 * HZ; 3582 group = 0; 3583 } 3584 } else if (transport_len >= sizeof(*ih3)) { 3585 ih3 = igmpv3_query_hdr(skb); 3586 if (ih3->nsrcs || 3587 (brmctx->multicast_igmp_version == 3 && group && 3588 ih3->suppress)) 3589 goto out; 3590 3591 max_delay = ih3->code ? 3592 igmpv3_mrt(ih3) * (HZ / IGMP_TIMER_SCALE) : 1; 3593 } else { 3594 goto out; 3595 } 3596 3597 if (!group) { 3598 saddr.proto = htons(ETH_P_IP); 3599 saddr.src.ip4 = iph->saddr; 3600 3601 br_ip4_multicast_query_received(brmctx, pmctx, 3602 &brmctx->ip4_other_query, 3603 &saddr, max_delay); 3604 goto out; 3605 } 3606 3607 mp = br_mdb_ip4_get(brmctx->br, group, vid); 3608 if (!mp) 3609 goto out; 3610 3611 max_delay *= brmctx->multicast_last_member_count; 3612 3613 if (mp->host_joined && 3614 (timer_pending(&mp->timer) ? 3615 time_after(mp->timer.expires, now + max_delay) : 3616 timer_delete_sync_try(&mp->timer) >= 0)) 3617 mod_timer(&mp->timer, now + max_delay); 3618 3619 for (pp = &mp->ports; 3620 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 3621 pp = &p->next) { 3622 if (timer_pending(&p->timer) ? 3623 time_after(p->timer.expires, now + max_delay) : 3624 timer_delete_sync_try(&p->timer) >= 0 && 3625 (brmctx->multicast_igmp_version == 2 || 3626 p->filter_mode == MCAST_EXCLUDE)) 3627 mod_timer(&p->timer, now + max_delay); 3628 } 3629 3630 out: 3631 spin_unlock(&brmctx->br->multicast_lock); 3632 } 3633 3634 #if IS_ENABLED(CONFIG_IPV6) 3635 static int br_ip6_multicast_query(struct net_bridge_mcast *brmctx, 3636 struct net_bridge_mcast_port *pmctx, 3637 struct sk_buff *skb, 3638 u16 vid) 3639 { 3640 unsigned int transport_len = ipv6_transport_len(skb); 3641 struct mld_msg *mld; 3642 struct net_bridge_mdb_entry *mp; 3643 struct mld2_query *mld2q; 3644 struct net_bridge_port_group *p; 3645 struct net_bridge_port_group __rcu **pp; 3646 struct br_ip saddr = {}; 3647 unsigned long max_delay; 3648 unsigned long now = jiffies; 3649 unsigned int offset = skb_transport_offset(skb); 3650 const struct in6_addr *group = NULL; 3651 bool is_general_query; 3652 int err = 0; 3653 3654 spin_lock(&brmctx->br->multicast_lock); 3655 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3656 goto out; 3657 3658 if (transport_len == sizeof(*mld)) { 3659 if (!pskb_may_pull(skb, offset + sizeof(*mld))) { 3660 err = -EINVAL; 3661 goto out; 3662 } 3663 mld = (struct mld_msg *) icmp6_hdr(skb); 3664 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); 3665 if (max_delay) 3666 group = &mld->mld_mca; 3667 } else { 3668 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) { 3669 err = -EINVAL; 3670 goto out; 3671 } 3672 mld2q = (struct mld2_query *)icmp6_hdr(skb); 3673 if (!mld2q->mld2q_nsrcs) 3674 group = &mld2q->mld2q_mca; 3675 if (brmctx->multicast_mld_version == 2 && 3676 !ipv6_addr_any(&mld2q->mld2q_mca) && 3677 mld2q->mld2q_suppress) 3678 goto out; 3679 3680 max_delay = max(msecs_to_jiffies(mldv2_mrd(mld2q)), 1UL); 3681 } 3682 3683 is_general_query = group && ipv6_addr_any(group); 3684 3685 if (is_general_query) { 3686 saddr.proto = htons(ETH_P_IPV6); 3687 saddr.src.ip6 = ipv6_hdr(skb)->saddr; 3688 3689 br_ip6_multicast_query_received(brmctx, pmctx, 3690 &brmctx->ip6_other_query, 3691 &saddr, max_delay); 3692 goto out; 3693 } else if (!group) { 3694 goto out; 3695 } 3696 3697 mp = br_mdb_ip6_get(brmctx->br, group, vid); 3698 if (!mp) 3699 goto out; 3700 3701 max_delay *= brmctx->multicast_last_member_count; 3702 if (mp->host_joined && 3703 (timer_pending(&mp->timer) ? 3704 time_after(mp->timer.expires, now + max_delay) : 3705 timer_delete_sync_try(&mp->timer) >= 0)) 3706 mod_timer(&mp->timer, now + max_delay); 3707 3708 for (pp = &mp->ports; 3709 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 3710 pp = &p->next) { 3711 if (timer_pending(&p->timer) ? 3712 time_after(p->timer.expires, now + max_delay) : 3713 timer_delete_sync_try(&p->timer) >= 0 && 3714 (brmctx->multicast_mld_version == 1 || 3715 p->filter_mode == MCAST_EXCLUDE)) 3716 mod_timer(&p->timer, now + max_delay); 3717 } 3718 3719 out: 3720 spin_unlock(&brmctx->br->multicast_lock); 3721 return err; 3722 } 3723 #endif 3724 3725 static void 3726 br_multicast_leave_group(struct net_bridge_mcast *brmctx, 3727 struct net_bridge_mcast_port *pmctx, 3728 struct br_ip *group, 3729 struct bridge_mcast_other_query *other_query, 3730 struct bridge_mcast_own_query *own_query, 3731 const unsigned char *src) 3732 { 3733 struct net_bridge_mdb_entry *mp; 3734 struct net_bridge_port_group *p; 3735 unsigned long now; 3736 unsigned long time; 3737 3738 spin_lock(&brmctx->br->multicast_lock); 3739 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3740 goto out; 3741 3742 mp = br_mdb_ip_get(brmctx->br, group); 3743 if (!mp) 3744 goto out; 3745 3746 if (pmctx && 3747 test_bit(BR_MULTICAST_FAST_LEAVE_BIT, &pmctx->port->flags)) { 3748 struct net_bridge_port_group __rcu **pp; 3749 3750 for (pp = &mp->ports; 3751 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 3752 pp = &p->next) { 3753 if (!br_port_group_equal(p, pmctx->port, src)) 3754 continue; 3755 3756 if (p->flags & MDB_PG_FLAGS_PERMANENT) 3757 break; 3758 3759 p->flags |= MDB_PG_FLAGS_FAST_LEAVE; 3760 br_multicast_del_pg(mp, p, pp); 3761 break; 3762 } 3763 goto out; 3764 } 3765 3766 if (timer_pending(&other_query->timer)) 3767 goto out; 3768 3769 if (brmctx->multicast_querier) { 3770 __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &mp->addr, 3771 false, 0, NULL); 3772 3773 time = jiffies + brmctx->multicast_last_member_count * 3774 brmctx->multicast_last_member_interval; 3775 3776 mod_timer(&own_query->timer, time); 3777 3778 for (p = mlock_dereference(mp->ports, brmctx->br); 3779 p != NULL && pmctx != NULL; 3780 p = mlock_dereference(p->next, brmctx->br)) { 3781 if (!br_port_group_equal(p, pmctx->port, src)) 3782 continue; 3783 3784 if (!hlist_unhashed(&p->mglist) && 3785 (timer_pending(&p->timer) ? 3786 time_after(p->timer.expires, time) : 3787 timer_delete_sync_try(&p->timer) >= 0)) { 3788 mod_timer(&p->timer, time); 3789 } 3790 3791 break; 3792 } 3793 } 3794 3795 now = jiffies; 3796 time = now + brmctx->multicast_last_member_count * 3797 brmctx->multicast_last_member_interval; 3798 3799 if (!pmctx) { 3800 if (mp->host_joined && 3801 (timer_pending(&mp->timer) ? 3802 time_after(mp->timer.expires, time) : 3803 timer_delete_sync_try(&mp->timer) >= 0)) { 3804 mod_timer(&mp->timer, time); 3805 } 3806 3807 goto out; 3808 } 3809 3810 for (p = mlock_dereference(mp->ports, brmctx->br); 3811 p != NULL; 3812 p = mlock_dereference(p->next, brmctx->br)) { 3813 if (p->key.port != pmctx->port) 3814 continue; 3815 3816 if (!hlist_unhashed(&p->mglist) && 3817 (timer_pending(&p->timer) ? 3818 time_after(p->timer.expires, time) : 3819 timer_delete_sync_try(&p->timer) >= 0)) { 3820 mod_timer(&p->timer, time); 3821 } 3822 3823 break; 3824 } 3825 out: 3826 spin_unlock(&brmctx->br->multicast_lock); 3827 } 3828 3829 static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx, 3830 struct net_bridge_mcast_port *pmctx, 3831 __be32 group, 3832 __u16 vid, 3833 const unsigned char *src) 3834 { 3835 struct br_ip br_group; 3836 struct bridge_mcast_own_query *own_query; 3837 3838 if (ipv4_is_local_multicast(group)) 3839 return; 3840 3841 own_query = pmctx ? &pmctx->ip4_own_query : &brmctx->ip4_own_query; 3842 3843 memset(&br_group, 0, sizeof(br_group)); 3844 br_group.dst.ip4 = group; 3845 br_group.proto = htons(ETH_P_IP); 3846 br_group.vid = vid; 3847 3848 br_multicast_leave_group(brmctx, pmctx, &br_group, 3849 &brmctx->ip4_other_query, 3850 own_query, src); 3851 } 3852 3853 #if IS_ENABLED(CONFIG_IPV6) 3854 static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx, 3855 struct net_bridge_mcast_port *pmctx, 3856 const struct in6_addr *group, 3857 __u16 vid, 3858 const unsigned char *src) 3859 { 3860 struct br_ip br_group; 3861 struct bridge_mcast_own_query *own_query; 3862 3863 if (ipv6_addr_is_ll_all_nodes(group)) 3864 return; 3865 3866 own_query = pmctx ? &pmctx->ip6_own_query : &brmctx->ip6_own_query; 3867 3868 memset(&br_group, 0, sizeof(br_group)); 3869 br_group.dst.ip6 = *group; 3870 br_group.proto = htons(ETH_P_IPV6); 3871 br_group.vid = vid; 3872 3873 br_multicast_leave_group(brmctx, pmctx, &br_group, 3874 &brmctx->ip6_other_query, 3875 own_query, src); 3876 } 3877 #endif 3878 3879 static void br_multicast_err_count(const struct net_bridge *br, 3880 const struct net_bridge_port *p, 3881 __be16 proto) 3882 { 3883 struct bridge_mcast_stats __percpu *stats; 3884 struct bridge_mcast_stats *pstats; 3885 3886 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 3887 return; 3888 3889 if (p) 3890 stats = p->mcast_stats; 3891 else 3892 stats = br->mcast_stats; 3893 if (WARN_ON(!stats)) 3894 return; 3895 3896 pstats = this_cpu_ptr(stats); 3897 3898 u64_stats_update_begin(&pstats->syncp); 3899 switch (proto) { 3900 case htons(ETH_P_IP): 3901 pstats->mstats.igmp_parse_errors++; 3902 break; 3903 #if IS_ENABLED(CONFIG_IPV6) 3904 case htons(ETH_P_IPV6): 3905 pstats->mstats.mld_parse_errors++; 3906 break; 3907 #endif 3908 } 3909 u64_stats_update_end(&pstats->syncp); 3910 } 3911 3912 static void br_multicast_pim(struct net_bridge_mcast *brmctx, 3913 struct net_bridge_mcast_port *pmctx, 3914 const struct sk_buff *skb) 3915 { 3916 unsigned int offset = skb_transport_offset(skb); 3917 struct pimhdr *pimhdr, _pimhdr; 3918 3919 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr); 3920 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION || 3921 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO) 3922 return; 3923 3924 spin_lock(&brmctx->br->multicast_lock); 3925 br_ip4_multicast_mark_router(brmctx, pmctx); 3926 spin_unlock(&brmctx->br->multicast_lock); 3927 } 3928 3929 static int br_ip4_multicast_mrd_rcv(struct net_bridge_mcast *brmctx, 3930 struct net_bridge_mcast_port *pmctx, 3931 struct sk_buff *skb) 3932 { 3933 if (ip_hdr(skb)->protocol != IPPROTO_IGMP || 3934 igmp_hdr(skb)->type != IGMP_MRDISC_ADV) 3935 return -ENOMSG; 3936 3937 spin_lock(&brmctx->br->multicast_lock); 3938 br_ip4_multicast_mark_router(brmctx, pmctx); 3939 spin_unlock(&brmctx->br->multicast_lock); 3940 3941 return 0; 3942 } 3943 3944 static int br_multicast_ipv4_rcv(struct net_bridge_mcast *brmctx, 3945 struct net_bridge_mcast_port *pmctx, 3946 struct sk_buff *skb, 3947 u16 vid) 3948 { 3949 struct net_bridge_port *p = pmctx ? pmctx->port : NULL; 3950 const unsigned char *src; 3951 struct igmphdr *ih; 3952 int err; 3953 3954 err = ip_mc_check_igmp(skb); 3955 3956 if (err == -ENOMSG) { 3957 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) { 3958 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 3959 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) { 3960 if (ip_hdr(skb)->protocol == IPPROTO_PIM) 3961 br_multicast_pim(brmctx, pmctx, skb); 3962 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) { 3963 br_ip4_multicast_mrd_rcv(brmctx, pmctx, skb); 3964 } 3965 3966 return 0; 3967 } else if (err < 0) { 3968 br_multicast_err_count(brmctx->br, p, skb->protocol); 3969 return err; 3970 } 3971 3972 ih = igmp_hdr(skb); 3973 src = eth_hdr(skb)->h_source; 3974 BR_INPUT_SKB_CB(skb)->igmp = ih->type; 3975 3976 switch (ih->type) { 3977 case IGMP_HOST_MEMBERSHIP_REPORT: 3978 case IGMPV2_HOST_MEMBERSHIP_REPORT: 3979 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 3980 err = br_ip4_multicast_add_group(brmctx, pmctx, ih->group, vid, 3981 src, true); 3982 break; 3983 case IGMPV3_HOST_MEMBERSHIP_REPORT: 3984 err = br_ip4_multicast_igmp3_report(brmctx, pmctx, skb, vid); 3985 break; 3986 case IGMP_HOST_MEMBERSHIP_QUERY: 3987 br_ip4_multicast_query(brmctx, pmctx, skb, vid); 3988 break; 3989 case IGMP_HOST_LEAVE_MESSAGE: 3990 br_ip4_multicast_leave_group(brmctx, pmctx, ih->group, vid, src); 3991 break; 3992 } 3993 3994 br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp, 3995 BR_MCAST_DIR_RX); 3996 3997 return err; 3998 } 3999 4000 #if IS_ENABLED(CONFIG_IPV6) 4001 static void br_ip6_multicast_mrd_rcv(struct net_bridge_mcast *brmctx, 4002 struct net_bridge_mcast_port *pmctx, 4003 struct sk_buff *skb) 4004 { 4005 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV) 4006 return; 4007 4008 spin_lock(&brmctx->br->multicast_lock); 4009 br_ip6_multicast_mark_router(brmctx, pmctx); 4010 spin_unlock(&brmctx->br->multicast_lock); 4011 } 4012 4013 static int br_multicast_ipv6_rcv(struct net_bridge_mcast *brmctx, 4014 struct net_bridge_mcast_port *pmctx, 4015 struct sk_buff *skb, 4016 u16 vid) 4017 { 4018 struct net_bridge_port *p = pmctx ? pmctx->port : NULL; 4019 const unsigned char *src; 4020 struct mld_msg *mld; 4021 int err; 4022 4023 err = ipv6_mc_check_mld(skb); 4024 4025 if (err == -ENOMSG || err == -ENODATA) { 4026 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr)) 4027 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 4028 if (err == -ENODATA && 4029 ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) 4030 br_ip6_multicast_mrd_rcv(brmctx, pmctx, skb); 4031 4032 return 0; 4033 } else if (err < 0) { 4034 br_multicast_err_count(brmctx->br, p, skb->protocol); 4035 return err; 4036 } 4037 4038 mld = (struct mld_msg *)skb_transport_header(skb); 4039 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type; 4040 4041 switch (mld->mld_type) { 4042 case ICMPV6_MGM_REPORT: 4043 src = eth_hdr(skb)->h_source; 4044 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 4045 err = br_ip6_multicast_add_group(brmctx, pmctx, &mld->mld_mca, 4046 vid, src, true); 4047 break; 4048 case ICMPV6_MLD2_REPORT: 4049 err = br_ip6_multicast_mld2_report(brmctx, pmctx, skb, vid); 4050 break; 4051 case ICMPV6_MGM_QUERY: 4052 err = br_ip6_multicast_query(brmctx, pmctx, skb, vid); 4053 break; 4054 case ICMPV6_MGM_REDUCTION: 4055 src = eth_hdr(skb)->h_source; 4056 br_ip6_multicast_leave_group(brmctx, pmctx, &mld->mld_mca, vid, 4057 src); 4058 break; 4059 } 4060 4061 br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp, 4062 BR_MCAST_DIR_RX); 4063 4064 return err; 4065 } 4066 #endif 4067 4068 int br_multicast_rcv(struct net_bridge_mcast **brmctx, 4069 struct net_bridge_mcast_port **pmctx, 4070 struct net_bridge_vlan *vlan, 4071 struct sk_buff *skb, u16 vid) 4072 { 4073 int ret = 0; 4074 4075 BR_INPUT_SKB_CB(skb)->igmp = 0; 4076 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 4077 4078 if (!br_opt_get((*brmctx)->br, BROPT_MULTICAST_ENABLED)) 4079 return 0; 4080 4081 if (br_opt_get((*brmctx)->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) && vlan) { 4082 const struct net_bridge_vlan *masterv; 4083 4084 /* the vlan has the master flag set only when transmitting 4085 * through the bridge device 4086 */ 4087 if (br_vlan_is_master(vlan)) { 4088 masterv = vlan; 4089 *brmctx = &vlan->br_mcast_ctx; 4090 *pmctx = NULL; 4091 } else { 4092 masterv = vlan->brvlan; 4093 *brmctx = &vlan->brvlan->br_mcast_ctx; 4094 *pmctx = &vlan->port_mcast_ctx; 4095 } 4096 4097 if (!(masterv->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED)) 4098 return 0; 4099 } 4100 4101 switch (skb->protocol) { 4102 case htons(ETH_P_IP): 4103 ret = br_multicast_ipv4_rcv(*brmctx, *pmctx, skb, vid); 4104 break; 4105 #if IS_ENABLED(CONFIG_IPV6) 4106 case htons(ETH_P_IPV6): 4107 ret = br_multicast_ipv6_rcv(*brmctx, *pmctx, skb, vid); 4108 break; 4109 #endif 4110 } 4111 4112 return ret; 4113 } 4114 4115 static void br_multicast_query_expired(struct net_bridge_mcast *brmctx, 4116 struct bridge_mcast_own_query *query) 4117 { 4118 spin_lock(&brmctx->br->multicast_lock); 4119 if (br_multicast_ctx_vlan_disabled(brmctx)) 4120 goto out; 4121 4122 if (query->startup_sent < brmctx->multicast_startup_query_count) 4123 query->startup_sent++; 4124 4125 br_multicast_send_query(brmctx, NULL, query); 4126 out: 4127 spin_unlock(&brmctx->br->multicast_lock); 4128 } 4129 4130 static void br_ip4_multicast_query_expired(struct timer_list *t) 4131 { 4132 struct net_bridge_mcast *brmctx = timer_container_of(brmctx, t, 4133 ip4_own_query.timer); 4134 4135 br_multicast_query_expired(brmctx, &brmctx->ip4_own_query); 4136 } 4137 4138 #if IS_ENABLED(CONFIG_IPV6) 4139 static void br_ip6_multicast_query_expired(struct timer_list *t) 4140 { 4141 struct net_bridge_mcast *brmctx = timer_container_of(brmctx, t, 4142 ip6_own_query.timer); 4143 4144 br_multicast_query_expired(brmctx, &brmctx->ip6_own_query); 4145 } 4146 #endif 4147 4148 static void br_multicast_gc_work(struct work_struct *work) 4149 { 4150 struct net_bridge *br = container_of(work, struct net_bridge, 4151 mcast_gc_work); 4152 HLIST_HEAD(deleted_head); 4153 4154 spin_lock_bh(&br->multicast_lock); 4155 hlist_move_list(&br->mcast_gc_list, &deleted_head); 4156 spin_unlock_bh(&br->multicast_lock); 4157 4158 br_multicast_gc(&deleted_head); 4159 } 4160 4161 void br_multicast_ctx_init(struct net_bridge *br, 4162 struct net_bridge_vlan *vlan, 4163 struct net_bridge_mcast *brmctx) 4164 { 4165 brmctx->br = br; 4166 brmctx->vlan = vlan; 4167 brmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 4168 brmctx->multicast_last_member_count = 2; 4169 brmctx->multicast_startup_query_count = 2; 4170 4171 brmctx->multicast_last_member_interval = HZ; 4172 brmctx->multicast_query_response_interval = 10 * HZ; 4173 brmctx->multicast_startup_query_interval = 125 * HZ / 4; 4174 brmctx->multicast_query_interval = 125 * HZ; 4175 brmctx->multicast_querier_interval = 255 * HZ; 4176 brmctx->multicast_membership_interval = 260 * HZ; 4177 4178 brmctx->ip4_querier.port_ifidx = 0; 4179 seqcount_spinlock_init(&brmctx->ip4_querier.seq, &br->multicast_lock); 4180 brmctx->multicast_igmp_version = 2; 4181 #if IS_ENABLED(CONFIG_IPV6) 4182 brmctx->multicast_mld_version = 1; 4183 brmctx->ip6_querier.port_ifidx = 0; 4184 seqcount_spinlock_init(&brmctx->ip6_querier.seq, &br->multicast_lock); 4185 #endif 4186 4187 skb_queue_head_init(&brmctx->query_queue); 4188 INIT_WORK(&brmctx->query_queue_work, br_multicast_query_queue_work); 4189 4190 timer_setup(&brmctx->ip4_mc_router_timer, 4191 br_ip4_multicast_local_router_expired, 0); 4192 timer_setup(&brmctx->ip4_other_query.timer, 4193 br_ip4_multicast_querier_expired, 0); 4194 timer_setup(&brmctx->ip4_other_query.delay_timer, 4195 br_multicast_query_delay_expired, 0); 4196 timer_setup(&brmctx->ip4_own_query.timer, 4197 br_ip4_multicast_query_expired, 0); 4198 #if IS_ENABLED(CONFIG_IPV6) 4199 timer_setup(&brmctx->ip6_mc_router_timer, 4200 br_ip6_multicast_local_router_expired, 0); 4201 timer_setup(&brmctx->ip6_other_query.timer, 4202 br_ip6_multicast_querier_expired, 0); 4203 timer_setup(&brmctx->ip6_other_query.delay_timer, 4204 br_multicast_query_delay_expired, 0); 4205 timer_setup(&brmctx->ip6_own_query.timer, 4206 br_ip6_multicast_query_expired, 0); 4207 #endif 4208 } 4209 4210 void br_multicast_ctx_deinit(struct net_bridge_mcast *brmctx) 4211 { 4212 __br_multicast_stop(brmctx); 4213 cancel_work_sync(&brmctx->query_queue_work); 4214 __skb_queue_purge(&brmctx->query_queue); 4215 } 4216 4217 void br_multicast_init(struct net_bridge *br) 4218 { 4219 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX; 4220 4221 br_multicast_ctx_init(br, NULL, &br->multicast_ctx); 4222 4223 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true); 4224 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true); 4225 4226 spin_lock_init(&br->multicast_lock); 4227 INIT_HLIST_HEAD(&br->mdb_list); 4228 INIT_HLIST_HEAD(&br->mcast_gc_list); 4229 INIT_WORK(&br->mcast_gc_work, br_multicast_gc_work); 4230 } 4231 4232 static void br_ip4_multicast_join_snoopers(struct net_bridge *br) 4233 { 4234 struct in_device *in_dev = in_dev_get(br->dev); 4235 4236 if (!in_dev) 4237 return; 4238 4239 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 4240 in_dev_put(in_dev); 4241 } 4242 4243 #if IS_ENABLED(CONFIG_IPV6) 4244 static void br_ip6_multicast_join_snoopers(struct net_bridge *br) 4245 { 4246 struct in6_addr addr; 4247 4248 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 4249 ipv6_dev_mc_inc(br->dev, &addr); 4250 } 4251 #else 4252 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br) 4253 { 4254 } 4255 #endif 4256 4257 void br_multicast_join_snoopers(struct net_bridge *br) 4258 { 4259 br_ip4_multicast_join_snoopers(br); 4260 br_ip6_multicast_join_snoopers(br); 4261 } 4262 4263 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br) 4264 { 4265 struct in_device *in_dev = in_dev_get(br->dev); 4266 4267 if (WARN_ON(!in_dev)) 4268 return; 4269 4270 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 4271 in_dev_put(in_dev); 4272 } 4273 4274 #if IS_ENABLED(CONFIG_IPV6) 4275 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 4276 { 4277 struct in6_addr addr; 4278 4279 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 4280 ipv6_dev_mc_dec(br->dev, &addr); 4281 } 4282 #else 4283 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 4284 { 4285 } 4286 #endif 4287 4288 void br_multicast_leave_snoopers(struct net_bridge *br) 4289 { 4290 br_ip4_multicast_leave_snoopers(br); 4291 br_ip6_multicast_leave_snoopers(br); 4292 } 4293 4294 static void __br_multicast_open_query(struct net_bridge *br, 4295 struct bridge_mcast_own_query *query) 4296 { 4297 query->startup_sent = 0; 4298 4299 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 4300 return; 4301 4302 mod_timer(&query->timer, jiffies); 4303 } 4304 4305 static void __br_multicast_open(struct net_bridge_mcast *brmctx) 4306 { 4307 __br_multicast_open_query(brmctx->br, &brmctx->ip4_own_query); 4308 #if IS_ENABLED(CONFIG_IPV6) 4309 __br_multicast_open_query(brmctx->br, &brmctx->ip6_own_query); 4310 #endif 4311 } 4312 4313 void br_multicast_open(struct net_bridge *br) 4314 { 4315 ASSERT_RTNL(); 4316 4317 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { 4318 struct net_bridge_vlan_group *vg; 4319 struct net_bridge_vlan *vlan; 4320 4321 vg = br_vlan_group(br); 4322 if (vg) { 4323 list_for_each_entry(vlan, &vg->vlan_list, vlist) { 4324 struct net_bridge_mcast *brmctx; 4325 4326 brmctx = &vlan->br_mcast_ctx; 4327 if (br_vlan_is_brentry(vlan) && 4328 !br_multicast_ctx_vlan_disabled(brmctx)) 4329 __br_multicast_open(&vlan->br_mcast_ctx); 4330 } 4331 } 4332 } else { 4333 __br_multicast_open(&br->multicast_ctx); 4334 } 4335 } 4336 4337 static void __br_multicast_stop(struct net_bridge_mcast *brmctx) 4338 { 4339 timer_delete_sync(&brmctx->ip4_mc_router_timer); 4340 timer_delete_sync(&brmctx->ip4_other_query.timer); 4341 timer_delete_sync(&brmctx->ip4_other_query.delay_timer); 4342 timer_delete_sync(&brmctx->ip4_own_query.timer); 4343 #if IS_ENABLED(CONFIG_IPV6) 4344 timer_delete_sync(&brmctx->ip6_mc_router_timer); 4345 timer_delete_sync(&brmctx->ip6_other_query.timer); 4346 timer_delete_sync(&brmctx->ip6_other_query.delay_timer); 4347 timer_delete_sync(&brmctx->ip6_own_query.timer); 4348 #endif 4349 } 4350 4351 void br_multicast_update_vlan_mcast_ctx(struct net_bridge_vlan *v, u8 state) 4352 { 4353 #if IS_ENABLED(CONFIG_BRIDGE_VLAN_FILTERING) 4354 struct net_bridge *br; 4355 4356 if (!br_vlan_should_use(v)) 4357 return; 4358 4359 if (br_vlan_is_master(v)) 4360 return; 4361 4362 br = v->port->br; 4363 4364 if (!br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) 4365 return; 4366 4367 if (br_vlan_state_allowed(state, true)) 4368 br_multicast_enable_port_ctx(&v->port_mcast_ctx); 4369 4370 /* Multicast is not disabled for the vlan when it goes in 4371 * blocking state because the timers will expire and stop by 4372 * themselves without sending more queries. 4373 */ 4374 #endif 4375 } 4376 4377 void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on) 4378 { 4379 struct net_bridge *br; 4380 4381 /* it's okay to check for the flag without the multicast lock because it 4382 * can only change under RTNL -> multicast_lock, we need the latter to 4383 * sync with timers and packets 4384 */ 4385 if (on == !!(vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) 4386 return; 4387 4388 if (br_vlan_is_master(vlan)) { 4389 br = vlan->br; 4390 4391 if (on && 4392 (!br_vlan_is_brentry(vlan) || 4393 br_multicast_ctx_vlan_global_disabled(&vlan->br_mcast_ctx))) 4394 return; 4395 4396 spin_lock_bh(&br->multicast_lock); 4397 vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED; 4398 spin_unlock_bh(&br->multicast_lock); 4399 4400 if (on) 4401 __br_multicast_open(&vlan->br_mcast_ctx); 4402 else 4403 __br_multicast_stop(&vlan->br_mcast_ctx); 4404 } else { 4405 struct net_bridge_mcast *brmctx; 4406 4407 brmctx = br_multicast_port_ctx_get_global(&vlan->port_mcast_ctx); 4408 if (on && br_multicast_ctx_vlan_global_disabled(brmctx)) 4409 return; 4410 4411 br = vlan->port->br; 4412 spin_lock_bh(&br->multicast_lock); 4413 vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED; 4414 if (on) 4415 __br_multicast_enable_port_ctx(&vlan->port_mcast_ctx); 4416 else 4417 __br_multicast_disable_port_ctx(&vlan->port_mcast_ctx); 4418 spin_unlock_bh(&br->multicast_lock); 4419 } 4420 } 4421 4422 static void br_multicast_toggle_vlan(struct net_bridge_vlan *vlan, bool on) 4423 { 4424 struct net_bridge_port *p; 4425 4426 if (WARN_ON_ONCE(!br_vlan_is_master(vlan))) 4427 return; 4428 4429 list_for_each_entry(p, &vlan->br->port_list, list) { 4430 struct net_bridge_vlan *vport; 4431 4432 vport = br_vlan_find(nbp_vlan_group(p), vlan->vid); 4433 if (!vport) 4434 continue; 4435 br_multicast_toggle_one_vlan(vport, on); 4436 } 4437 4438 if (br_vlan_is_brentry(vlan)) 4439 br_multicast_toggle_one_vlan(vlan, on); 4440 } 4441 4442 int br_multicast_toggle_vlan_snooping(struct net_bridge *br, bool on, 4443 struct netlink_ext_ack *extack) 4444 { 4445 struct net_bridge_vlan_group *vg; 4446 struct net_bridge_vlan *vlan; 4447 struct net_bridge_port *p; 4448 4449 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) == on) 4450 return 0; 4451 4452 if (on && !br_opt_get(br, BROPT_VLAN_ENABLED)) { 4453 NL_SET_ERR_MSG_MOD(extack, "Cannot enable multicast vlan snooping with vlan filtering disabled"); 4454 return -EINVAL; 4455 } 4456 4457 vg = br_vlan_group(br); 4458 if (!vg) 4459 return 0; 4460 4461 br_opt_toggle(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED, on); 4462 4463 /* disable/enable non-vlan mcast contexts based on vlan snooping */ 4464 if (on) 4465 __br_multicast_stop(&br->multicast_ctx); 4466 else 4467 __br_multicast_open(&br->multicast_ctx); 4468 list_for_each_entry(p, &br->port_list, list) { 4469 if (on) 4470 br_multicast_disable_port_ctx(&p->multicast_ctx); 4471 else 4472 br_multicast_enable_port_ctx(&p->multicast_ctx); 4473 } 4474 4475 list_for_each_entry(vlan, &vg->vlan_list, vlist) 4476 br_multicast_toggle_vlan(vlan, on); 4477 4478 return 0; 4479 } 4480 4481 bool br_multicast_toggle_global_vlan(struct net_bridge_vlan *vlan, bool on) 4482 { 4483 ASSERT_RTNL(); 4484 4485 /* BR_VLFLAG_GLOBAL_MCAST_ENABLED relies on eventual consistency and 4486 * requires only RTNL to change 4487 */ 4488 if (on == !!(vlan->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED)) 4489 return false; 4490 4491 vlan->priv_flags ^= BR_VLFLAG_GLOBAL_MCAST_ENABLED; 4492 br_multicast_toggle_vlan(vlan, on); 4493 4494 return true; 4495 } 4496 4497 void br_multicast_stop(struct net_bridge *br) 4498 { 4499 ASSERT_RTNL(); 4500 4501 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { 4502 struct net_bridge_vlan_group *vg; 4503 struct net_bridge_vlan *vlan; 4504 4505 vg = br_vlan_group(br); 4506 if (vg) { 4507 list_for_each_entry(vlan, &vg->vlan_list, vlist) { 4508 struct net_bridge_mcast *brmctx; 4509 4510 brmctx = &vlan->br_mcast_ctx; 4511 if (br_vlan_is_brentry(vlan) && 4512 !br_multicast_ctx_vlan_disabled(brmctx)) 4513 __br_multicast_stop(&vlan->br_mcast_ctx); 4514 } 4515 } 4516 } else { 4517 __br_multicast_stop(&br->multicast_ctx); 4518 } 4519 } 4520 4521 void br_multicast_dev_del(struct net_bridge *br) 4522 { 4523 struct net_bridge_mdb_entry *mp; 4524 HLIST_HEAD(deleted_head); 4525 struct hlist_node *tmp; 4526 4527 spin_lock_bh(&br->multicast_lock); 4528 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) 4529 br_multicast_del_mdb_entry(mp); 4530 hlist_move_list(&br->mcast_gc_list, &deleted_head); 4531 spin_unlock_bh(&br->multicast_lock); 4532 4533 br_multicast_ctx_deinit(&br->multicast_ctx); 4534 br_multicast_gc(&deleted_head); 4535 cancel_work_sync(&br->mcast_gc_work); 4536 } 4537 4538 int br_multicast_set_router(struct net_bridge_mcast *brmctx, unsigned long val) 4539 { 4540 int err = -EINVAL; 4541 4542 spin_lock_bh(&brmctx->br->multicast_lock); 4543 4544 switch (val) { 4545 case MDB_RTR_TYPE_DISABLED: 4546 case MDB_RTR_TYPE_PERM: 4547 br_mc_router_state_change(brmctx->br, val == MDB_RTR_TYPE_PERM); 4548 timer_delete(&brmctx->ip4_mc_router_timer); 4549 #if IS_ENABLED(CONFIG_IPV6) 4550 timer_delete(&brmctx->ip6_mc_router_timer); 4551 #endif 4552 brmctx->multicast_router = val; 4553 err = 0; 4554 break; 4555 case MDB_RTR_TYPE_TEMP_QUERY: 4556 if (brmctx->multicast_router != MDB_RTR_TYPE_TEMP_QUERY) 4557 br_mc_router_state_change(brmctx->br, false); 4558 brmctx->multicast_router = val; 4559 err = 0; 4560 break; 4561 } 4562 4563 spin_unlock_bh(&brmctx->br->multicast_lock); 4564 4565 return err; 4566 } 4567 4568 static void 4569 br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted) 4570 { 4571 if (!deleted) 4572 return; 4573 4574 /* For backwards compatibility for now, only notify if there is 4575 * no multicast router anymore for both IPv4 and IPv6. 4576 */ 4577 if (!hlist_unhashed(&pmctx->ip4_rlist)) 4578 return; 4579 #if IS_ENABLED(CONFIG_IPV6) 4580 if (!hlist_unhashed(&pmctx->ip6_rlist)) 4581 return; 4582 #endif 4583 4584 br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_DELMDB); 4585 br_port_mc_router_state_change(pmctx->port, false); 4586 4587 /* don't allow timer refresh */ 4588 if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP) 4589 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 4590 } 4591 4592 int br_multicast_set_port_router(struct net_bridge_mcast_port *pmctx, 4593 unsigned long val) 4594 { 4595 struct net_bridge_mcast *brmctx; 4596 unsigned long now = jiffies; 4597 int err = -EINVAL; 4598 bool del = false; 4599 4600 brmctx = br_multicast_port_ctx_get_global(pmctx); 4601 spin_lock_bh(&brmctx->br->multicast_lock); 4602 if (pmctx->multicast_router == val) { 4603 /* Refresh the temp router port timer */ 4604 if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP) { 4605 mod_timer(&pmctx->ip4_mc_router_timer, 4606 now + brmctx->multicast_querier_interval); 4607 #if IS_ENABLED(CONFIG_IPV6) 4608 mod_timer(&pmctx->ip6_mc_router_timer, 4609 now + brmctx->multicast_querier_interval); 4610 #endif 4611 } 4612 err = 0; 4613 goto unlock; 4614 } 4615 switch (val) { 4616 case MDB_RTR_TYPE_DISABLED: 4617 pmctx->multicast_router = MDB_RTR_TYPE_DISABLED; 4618 del |= br_ip4_multicast_rport_del(pmctx); 4619 timer_delete(&pmctx->ip4_mc_router_timer); 4620 del |= br_ip6_multicast_rport_del(pmctx); 4621 #if IS_ENABLED(CONFIG_IPV6) 4622 timer_delete(&pmctx->ip6_mc_router_timer); 4623 #endif 4624 br_multicast_rport_del_notify(pmctx, del); 4625 break; 4626 case MDB_RTR_TYPE_TEMP_QUERY: 4627 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 4628 del |= br_ip4_multicast_rport_del(pmctx); 4629 del |= br_ip6_multicast_rport_del(pmctx); 4630 br_multicast_rport_del_notify(pmctx, del); 4631 break; 4632 case MDB_RTR_TYPE_PERM: 4633 pmctx->multicast_router = MDB_RTR_TYPE_PERM; 4634 timer_delete(&pmctx->ip4_mc_router_timer); 4635 br_ip4_multicast_add_router(brmctx, pmctx); 4636 #if IS_ENABLED(CONFIG_IPV6) 4637 timer_delete(&pmctx->ip6_mc_router_timer); 4638 #endif 4639 br_ip6_multicast_add_router(brmctx, pmctx); 4640 break; 4641 case MDB_RTR_TYPE_TEMP: 4642 pmctx->multicast_router = MDB_RTR_TYPE_TEMP; 4643 br_ip4_multicast_mark_router(brmctx, pmctx); 4644 br_ip6_multicast_mark_router(brmctx, pmctx); 4645 break; 4646 default: 4647 goto unlock; 4648 } 4649 err = 0; 4650 unlock: 4651 spin_unlock_bh(&brmctx->br->multicast_lock); 4652 4653 return err; 4654 } 4655 4656 int br_multicast_set_vlan_router(struct net_bridge_vlan *v, u8 mcast_router) 4657 { 4658 int err; 4659 4660 if (br_vlan_is_master(v)) 4661 err = br_multicast_set_router(&v->br_mcast_ctx, mcast_router); 4662 else 4663 err = br_multicast_set_port_router(&v->port_mcast_ctx, 4664 mcast_router); 4665 4666 return err; 4667 } 4668 4669 static void br_multicast_start_querier(struct net_bridge_mcast *brmctx, 4670 struct bridge_mcast_own_query *query) 4671 { 4672 struct net_bridge_port *port; 4673 4674 if (!br_multicast_ctx_matches_vlan_snooping(brmctx)) 4675 return; 4676 4677 __br_multicast_open_query(brmctx->br, query); 4678 4679 rcu_read_lock(); 4680 list_for_each_entry_rcu(port, &brmctx->br->port_list, list) { 4681 struct bridge_mcast_own_query *ip4_own_query; 4682 #if IS_ENABLED(CONFIG_IPV6) 4683 struct bridge_mcast_own_query *ip6_own_query; 4684 #endif 4685 4686 if (br_multicast_port_ctx_state_stopped(&port->multicast_ctx)) 4687 continue; 4688 4689 if (br_multicast_ctx_is_vlan(brmctx)) { 4690 struct net_bridge_vlan *vlan; 4691 4692 vlan = br_vlan_find(nbp_vlan_group_rcu(port), 4693 brmctx->vlan->vid); 4694 if (!vlan || 4695 br_multicast_port_ctx_state_stopped(&vlan->port_mcast_ctx)) 4696 continue; 4697 4698 ip4_own_query = &vlan->port_mcast_ctx.ip4_own_query; 4699 #if IS_ENABLED(CONFIG_IPV6) 4700 ip6_own_query = &vlan->port_mcast_ctx.ip6_own_query; 4701 #endif 4702 } else { 4703 ip4_own_query = &port->multicast_ctx.ip4_own_query; 4704 #if IS_ENABLED(CONFIG_IPV6) 4705 ip6_own_query = &port->multicast_ctx.ip6_own_query; 4706 #endif 4707 } 4708 4709 if (query == &brmctx->ip4_own_query) 4710 br_multicast_enable(ip4_own_query); 4711 #if IS_ENABLED(CONFIG_IPV6) 4712 else 4713 br_multicast_enable(ip6_own_query); 4714 #endif 4715 } 4716 rcu_read_unlock(); 4717 } 4718 4719 static void br_multicast_enable_all_ports(struct net_bridge *br) 4720 { 4721 struct net_bridge_port *port; 4722 4723 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) 4724 return; 4725 4726 list_for_each_entry(port, &br->port_list, list) 4727 __br_multicast_enable_port_ctx(&port->multicast_ctx); 4728 } 4729 4730 static void br_multicast_disable_all_ports(struct net_bridge *br) 4731 { 4732 struct net_bridge_port *port; 4733 4734 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) 4735 return; 4736 4737 list_for_each_entry(port, &br->port_list, list) 4738 __br_multicast_disable_port_ctx(&port->multicast_ctx); 4739 } 4740 4741 int br_multicast_toggle(struct net_bridge *br, unsigned long val, 4742 struct netlink_ext_ack *extack) 4743 { 4744 bool change_snoopers = false; 4745 int err = 0; 4746 4747 spin_lock_bh(&br->multicast_lock); 4748 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val) 4749 goto unlock; 4750 4751 err = br_mc_disabled_update(br->dev, val, extack); 4752 if (err == -EOPNOTSUPP) 4753 err = 0; 4754 if (err) 4755 goto unlock; 4756 4757 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val); 4758 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) { 4759 change_snoopers = true; 4760 br_multicast_disable_all_ports(br); 4761 goto unlock; 4762 } 4763 4764 if (!netif_running(br->dev)) 4765 goto unlock; 4766 4767 br_multicast_open(br); 4768 br_multicast_enable_all_ports(br); 4769 4770 change_snoopers = true; 4771 4772 unlock: 4773 spin_unlock_bh(&br->multicast_lock); 4774 4775 /* br_multicast_join_snoopers has the potential to cause 4776 * an MLD Report/Leave to be delivered to br_multicast_rcv, 4777 * which would in turn call br_multicast_add_group, which would 4778 * attempt to acquire multicast_lock. This function should be 4779 * called after the lock has been released to avoid deadlocks on 4780 * multicast_lock. 4781 * 4782 * br_multicast_leave_snoopers does not have the problem since 4783 * br_multicast_rcv first checks BROPT_MULTICAST_ENABLED, and 4784 * returns without calling br_multicast_ipv4/6_rcv if it's not 4785 * enabled. Moved both functions out just for symmetry. 4786 */ 4787 if (change_snoopers) { 4788 if (br_opt_get(br, BROPT_MULTICAST_ENABLED)) 4789 br_multicast_join_snoopers(br); 4790 else 4791 br_multicast_leave_snoopers(br); 4792 } 4793 4794 return err; 4795 } 4796 4797 bool br_multicast_enabled(const struct net_device *dev) 4798 { 4799 struct net_bridge *br = netdev_priv(dev); 4800 4801 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED); 4802 } 4803 EXPORT_SYMBOL_GPL(br_multicast_enabled); 4804 4805 bool br_multicast_router(const struct net_device *dev) 4806 { 4807 struct net_bridge *br = netdev_priv(dev); 4808 bool is_router; 4809 4810 spin_lock_bh(&br->multicast_lock); 4811 is_router = br_multicast_is_router(&br->multicast_ctx, NULL); 4812 spin_unlock_bh(&br->multicast_lock); 4813 return is_router; 4814 } 4815 EXPORT_SYMBOL_GPL(br_multicast_router); 4816 4817 int br_multicast_set_querier(struct net_bridge_mcast *brmctx, unsigned long val) 4818 { 4819 unsigned long max_delay; 4820 4821 val = !!val; 4822 4823 spin_lock_bh(&brmctx->br->multicast_lock); 4824 if (brmctx->multicast_querier == val) 4825 goto unlock; 4826 4827 WRITE_ONCE(brmctx->multicast_querier, val); 4828 if (!val) 4829 goto unlock; 4830 4831 max_delay = brmctx->multicast_query_response_interval; 4832 4833 if (!timer_pending(&brmctx->ip4_other_query.timer)) 4834 mod_timer(&brmctx->ip4_other_query.delay_timer, 4835 jiffies + max_delay); 4836 4837 br_multicast_start_querier(brmctx, &brmctx->ip4_own_query); 4838 4839 #if IS_ENABLED(CONFIG_IPV6) 4840 if (!timer_pending(&brmctx->ip6_other_query.timer)) 4841 mod_timer(&brmctx->ip6_other_query.delay_timer, 4842 jiffies + max_delay); 4843 4844 br_multicast_start_querier(brmctx, &brmctx->ip6_own_query); 4845 #endif 4846 4847 unlock: 4848 spin_unlock_bh(&brmctx->br->multicast_lock); 4849 4850 return 0; 4851 } 4852 4853 int br_multicast_set_igmp_version(struct net_bridge_mcast *brmctx, 4854 unsigned long val) 4855 { 4856 /* Currently we support only version 2 and 3 */ 4857 switch (val) { 4858 case 2: 4859 case 3: 4860 break; 4861 default: 4862 return -EINVAL; 4863 } 4864 4865 spin_lock_bh(&brmctx->br->multicast_lock); 4866 brmctx->multicast_igmp_version = val; 4867 spin_unlock_bh(&brmctx->br->multicast_lock); 4868 4869 return 0; 4870 } 4871 4872 #if IS_ENABLED(CONFIG_IPV6) 4873 int br_multicast_set_mld_version(struct net_bridge_mcast *brmctx, 4874 unsigned long val) 4875 { 4876 /* Currently we support version 1 and 2 */ 4877 switch (val) { 4878 case 1: 4879 case 2: 4880 break; 4881 default: 4882 return -EINVAL; 4883 } 4884 4885 spin_lock_bh(&brmctx->br->multicast_lock); 4886 brmctx->multicast_mld_version = val; 4887 spin_unlock_bh(&brmctx->br->multicast_lock); 4888 4889 return 0; 4890 } 4891 #endif 4892 4893 void br_multicast_set_query_intvl(struct net_bridge_mcast *brmctx, 4894 unsigned long val) 4895 { 4896 unsigned long intvl_jiffies = clock_t_to_jiffies(val); 4897 4898 if (intvl_jiffies < BR_MULTICAST_QUERY_INTVL_MIN) { 4899 br_info(brmctx->br, 4900 "trying to set multicast query interval below minimum, setting to %lu (%ums)\n", 4901 jiffies_to_clock_t(BR_MULTICAST_QUERY_INTVL_MIN), 4902 jiffies_to_msecs(BR_MULTICAST_QUERY_INTVL_MIN)); 4903 intvl_jiffies = BR_MULTICAST_QUERY_INTVL_MIN; 4904 } 4905 4906 if (intvl_jiffies > BR_MULTICAST_QUERY_INTVL_MAX) { 4907 br_info(brmctx->br, 4908 "trying to set multicast query interval above maximum, setting to %lu (%ums)\n", 4909 jiffies_to_clock_t(BR_MULTICAST_QUERY_INTVL_MAX), 4910 jiffies_to_msecs(BR_MULTICAST_QUERY_INTVL_MAX)); 4911 intvl_jiffies = BR_MULTICAST_QUERY_INTVL_MAX; 4912 } 4913 4914 brmctx->multicast_query_interval = intvl_jiffies; 4915 } 4916 4917 void br_multicast_set_startup_query_intvl(struct net_bridge_mcast *brmctx, 4918 unsigned long val) 4919 { 4920 unsigned long intvl_jiffies = clock_t_to_jiffies(val); 4921 4922 if (intvl_jiffies < BR_MULTICAST_STARTUP_QUERY_INTVL_MIN) { 4923 br_info(brmctx->br, 4924 "trying to set multicast startup query interval below minimum, setting to %lu (%ums)\n", 4925 jiffies_to_clock_t(BR_MULTICAST_STARTUP_QUERY_INTVL_MIN), 4926 jiffies_to_msecs(BR_MULTICAST_STARTUP_QUERY_INTVL_MIN)); 4927 intvl_jiffies = BR_MULTICAST_STARTUP_QUERY_INTVL_MIN; 4928 } 4929 4930 if (intvl_jiffies > BR_MULTICAST_STARTUP_QUERY_INTVL_MAX) { 4931 br_info(brmctx->br, 4932 "trying to set multicast startup query interval above maximum, setting to %lu (%ums)\n", 4933 jiffies_to_clock_t(BR_MULTICAST_STARTUP_QUERY_INTVL_MAX), 4934 jiffies_to_msecs(BR_MULTICAST_STARTUP_QUERY_INTVL_MAX)); 4935 intvl_jiffies = BR_MULTICAST_STARTUP_QUERY_INTVL_MAX; 4936 } 4937 4938 brmctx->multicast_startup_query_interval = intvl_jiffies; 4939 } 4940 4941 /** 4942 * br_multicast_list_adjacent - Returns snooped multicast addresses 4943 * @dev: The bridge port adjacent to which to retrieve addresses 4944 * @br_ip_list: The list to store found, snooped multicast IP addresses in 4945 * 4946 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast 4947 * snooping feature on all bridge ports of dev's bridge device, excluding 4948 * the addresses from dev itself. 4949 * 4950 * Returns the number of items added to br_ip_list. 4951 * 4952 * Notes: 4953 * - br_ip_list needs to be initialized by caller 4954 * - br_ip_list might contain duplicates in the end 4955 * (needs to be taken care of by caller) 4956 * - br_ip_list needs to be freed by caller 4957 */ 4958 int br_multicast_list_adjacent(struct net_device *dev, 4959 struct list_head *br_ip_list) 4960 { 4961 struct net_bridge *br; 4962 struct net_bridge_port *port; 4963 struct net_bridge_port_group *group; 4964 struct br_ip_list *entry; 4965 int count = 0; 4966 4967 rcu_read_lock(); 4968 if (!br_ip_list || !netif_is_bridge_port(dev)) 4969 goto unlock; 4970 4971 port = br_port_get_rcu(dev); 4972 if (!port || !port->br) 4973 goto unlock; 4974 4975 br = port->br; 4976 4977 list_for_each_entry_rcu(port, &br->port_list, list) { 4978 if (!port->dev || port->dev == dev) 4979 continue; 4980 4981 hlist_for_each_entry_rcu(group, &port->mglist, mglist) { 4982 entry = kmalloc_obj(*entry, GFP_ATOMIC); 4983 if (!entry) 4984 goto unlock; 4985 4986 entry->addr = group->key.addr; 4987 list_add(&entry->list, br_ip_list); 4988 count++; 4989 } 4990 } 4991 4992 unlock: 4993 rcu_read_unlock(); 4994 return count; 4995 } 4996 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); 4997 4998 /** 4999 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge 5000 * @dev: The bridge port providing the bridge on which to check for a querier 5001 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 5002 * 5003 * Checks whether the given interface has a bridge on top and if so returns 5004 * true if a valid querier exists anywhere on the bridged link layer. 5005 * Otherwise returns false. 5006 */ 5007 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto) 5008 { 5009 struct net_bridge *br; 5010 struct net_bridge_port *port; 5011 struct ethhdr eth; 5012 bool ret = false; 5013 5014 rcu_read_lock(); 5015 if (!netif_is_bridge_port(dev)) 5016 goto unlock; 5017 5018 port = br_port_get_rcu(dev); 5019 if (!port || !port->br) 5020 goto unlock; 5021 5022 br = port->br; 5023 5024 memset(ð, 0, sizeof(eth)); 5025 eth.h_proto = htons(proto); 5026 5027 ret = br_multicast_querier_exists(&br->multicast_ctx, ð, NULL); 5028 5029 unlock: 5030 rcu_read_unlock(); 5031 return ret; 5032 } 5033 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere); 5034 5035 /** 5036 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port 5037 * @dev: The bridge port adjacent to which to check for a querier 5038 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 5039 * 5040 * Checks whether the given interface has a bridge on top and if so returns 5041 * true if a selected querier is behind one of the other ports of this 5042 * bridge. Otherwise returns false. 5043 */ 5044 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) 5045 { 5046 struct net_bridge_mcast *brmctx; 5047 struct net_bridge *br; 5048 struct net_bridge_port *port; 5049 bool ret = false; 5050 int port_ifidx; 5051 5052 rcu_read_lock(); 5053 if (!netif_is_bridge_port(dev)) 5054 goto unlock; 5055 5056 port = br_port_get_rcu(dev); 5057 if (!port || !port->br) 5058 goto unlock; 5059 5060 br = port->br; 5061 brmctx = &br->multicast_ctx; 5062 5063 switch (proto) { 5064 case ETH_P_IP: 5065 port_ifidx = brmctx->ip4_querier.port_ifidx; 5066 if (!timer_pending(&brmctx->ip4_other_query.timer) || 5067 port_ifidx == port->dev->ifindex) 5068 goto unlock; 5069 break; 5070 #if IS_ENABLED(CONFIG_IPV6) 5071 case ETH_P_IPV6: 5072 port_ifidx = brmctx->ip6_querier.port_ifidx; 5073 if (!timer_pending(&brmctx->ip6_other_query.timer) || 5074 port_ifidx == port->dev->ifindex) 5075 goto unlock; 5076 break; 5077 #endif 5078 default: 5079 goto unlock; 5080 } 5081 5082 ret = true; 5083 unlock: 5084 rcu_read_unlock(); 5085 return ret; 5086 } 5087 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); 5088 5089 /** 5090 * br_multicast_has_router_adjacent - Checks for a router behind a bridge port 5091 * @dev: The bridge port adjacent to which to check for a multicast router 5092 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 5093 * 5094 * Checks whether the given interface has a bridge on top and if so returns 5095 * true if a multicast router is behind one of the other ports of this 5096 * bridge. Otherwise returns false. 5097 */ 5098 bool br_multicast_has_router_adjacent(struct net_device *dev, int proto) 5099 { 5100 struct net_bridge_mcast_port *pmctx; 5101 struct net_bridge_mcast *brmctx; 5102 struct net_bridge_port *port; 5103 bool ret = false; 5104 5105 rcu_read_lock(); 5106 port = br_port_get_check_rcu(dev); 5107 if (!port) 5108 goto unlock; 5109 5110 brmctx = &port->br->multicast_ctx; 5111 switch (proto) { 5112 case ETH_P_IP: 5113 hlist_for_each_entry_rcu(pmctx, &brmctx->ip4_mc_router_list, 5114 ip4_rlist) { 5115 if (pmctx->port == port) 5116 continue; 5117 5118 ret = true; 5119 goto unlock; 5120 } 5121 break; 5122 #if IS_ENABLED(CONFIG_IPV6) 5123 case ETH_P_IPV6: 5124 hlist_for_each_entry_rcu(pmctx, &brmctx->ip6_mc_router_list, 5125 ip6_rlist) { 5126 if (pmctx->port == port) 5127 continue; 5128 5129 ret = true; 5130 goto unlock; 5131 } 5132 break; 5133 #endif 5134 default: 5135 /* when compiled without IPv6 support, be conservative and 5136 * always assume presence of an IPv6 multicast router 5137 */ 5138 ret = true; 5139 } 5140 5141 unlock: 5142 rcu_read_unlock(); 5143 return ret; 5144 } 5145 EXPORT_SYMBOL_GPL(br_multicast_has_router_adjacent); 5146 5147 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats, 5148 const struct sk_buff *skb, u8 type, u8 dir) 5149 { 5150 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats); 5151 __be16 proto = skb->protocol; 5152 unsigned int t_len; 5153 5154 u64_stats_update_begin(&pstats->syncp); 5155 switch (proto) { 5156 case htons(ETH_P_IP): 5157 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); 5158 switch (type) { 5159 case IGMP_HOST_MEMBERSHIP_REPORT: 5160 pstats->mstats.igmp_v1reports[dir]++; 5161 break; 5162 case IGMPV2_HOST_MEMBERSHIP_REPORT: 5163 pstats->mstats.igmp_v2reports[dir]++; 5164 break; 5165 case IGMPV3_HOST_MEMBERSHIP_REPORT: 5166 pstats->mstats.igmp_v3reports[dir]++; 5167 break; 5168 case IGMP_HOST_MEMBERSHIP_QUERY: 5169 if (t_len != sizeof(struct igmphdr)) { 5170 pstats->mstats.igmp_v3queries[dir]++; 5171 } else { 5172 unsigned int offset = skb_transport_offset(skb); 5173 struct igmphdr *ih, _ihdr; 5174 5175 ih = skb_header_pointer(skb, offset, 5176 sizeof(_ihdr), &_ihdr); 5177 if (!ih) 5178 break; 5179 if (!ih->code) 5180 pstats->mstats.igmp_v1queries[dir]++; 5181 else 5182 pstats->mstats.igmp_v2queries[dir]++; 5183 } 5184 break; 5185 case IGMP_HOST_LEAVE_MESSAGE: 5186 pstats->mstats.igmp_leaves[dir]++; 5187 break; 5188 } 5189 break; 5190 #if IS_ENABLED(CONFIG_IPV6) 5191 case htons(ETH_P_IPV6): 5192 t_len = ntohs(ipv6_hdr(skb)->payload_len) + 5193 sizeof(struct ipv6hdr); 5194 t_len -= skb_network_header_len(skb); 5195 switch (type) { 5196 case ICMPV6_MGM_REPORT: 5197 pstats->mstats.mld_v1reports[dir]++; 5198 break; 5199 case ICMPV6_MLD2_REPORT: 5200 pstats->mstats.mld_v2reports[dir]++; 5201 break; 5202 case ICMPV6_MGM_QUERY: 5203 if (t_len != sizeof(struct mld_msg)) 5204 pstats->mstats.mld_v2queries[dir]++; 5205 else 5206 pstats->mstats.mld_v1queries[dir]++; 5207 break; 5208 case ICMPV6_MGM_REDUCTION: 5209 pstats->mstats.mld_leaves[dir]++; 5210 break; 5211 } 5212 break; 5213 #endif /* CONFIG_IPV6 */ 5214 } 5215 u64_stats_update_end(&pstats->syncp); 5216 } 5217 5218 void br_multicast_count(struct net_bridge *br, 5219 const struct net_bridge_port *p, 5220 const struct sk_buff *skb, u8 type, u8 dir) 5221 { 5222 struct bridge_mcast_stats __percpu *stats; 5223 5224 /* if multicast_disabled is true then igmp type can't be set */ 5225 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 5226 return; 5227 5228 if (p) 5229 stats = p->mcast_stats; 5230 else 5231 stats = br->mcast_stats; 5232 if (WARN_ON(!stats)) 5233 return; 5234 5235 br_mcast_stats_add(stats, skb, type, dir); 5236 } 5237 5238 int br_multicast_init_stats(struct net_bridge *br) 5239 { 5240 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 5241 if (!br->mcast_stats) 5242 return -ENOMEM; 5243 5244 return 0; 5245 } 5246 5247 void br_multicast_uninit_stats(struct net_bridge *br) 5248 { 5249 free_percpu(br->mcast_stats); 5250 } 5251 5252 /* noinline for https://llvm.org/pr45802#c9 */ 5253 static noinline_for_stack void mcast_stats_add_dir(u64 *dst, u64 *src) 5254 { 5255 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX]; 5256 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX]; 5257 } 5258 5259 void br_multicast_get_stats(const struct net_bridge *br, 5260 const struct net_bridge_port *p, 5261 struct br_mcast_stats *dest) 5262 { 5263 struct bridge_mcast_stats __percpu *stats; 5264 struct br_mcast_stats tdst; 5265 int i; 5266 5267 memset(dest, 0, sizeof(*dest)); 5268 if (p) 5269 stats = p->mcast_stats; 5270 else 5271 stats = br->mcast_stats; 5272 if (WARN_ON(!stats)) 5273 return; 5274 5275 memset(&tdst, 0, sizeof(tdst)); 5276 for_each_possible_cpu(i) { 5277 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i); 5278 struct br_mcast_stats temp; 5279 unsigned int start; 5280 5281 do { 5282 start = u64_stats_fetch_begin(&cpu_stats->syncp); 5283 u64_stats_copy(&temp, &cpu_stats->mstats, sizeof(temp)); 5284 } while (u64_stats_fetch_retry(&cpu_stats->syncp, start)); 5285 5286 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries); 5287 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries); 5288 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries); 5289 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves); 5290 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports); 5291 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports); 5292 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports); 5293 tdst.igmp_parse_errors += temp.igmp_parse_errors; 5294 5295 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries); 5296 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries); 5297 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves); 5298 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports); 5299 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports); 5300 tdst.mld_parse_errors += temp.mld_parse_errors; 5301 } 5302 memcpy(dest, &tdst, sizeof(*dest)); 5303 } 5304 5305 int br_mdb_hash_init(struct net_bridge *br) 5306 { 5307 int err; 5308 5309 err = rhashtable_init(&br->sg_port_tbl, &br_sg_port_rht_params); 5310 if (err) 5311 return err; 5312 5313 err = rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params); 5314 if (err) { 5315 rhashtable_destroy(&br->sg_port_tbl); 5316 return err; 5317 } 5318 5319 return 0; 5320 } 5321 5322 void br_mdb_hash_fini(struct net_bridge *br) 5323 { 5324 rhashtable_destroy(&br->sg_port_tbl); 5325 rhashtable_destroy(&br->mdb_hash_tbl); 5326 } 5327