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