1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Bridge multicast support. 4 * 5 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> 6 */ 7 8 #include <linux/err.h> 9 #include <linux/export.h> 10 #include <linux/if_ether.h> 11 #include <linux/igmp.h> 12 #include <linux/in.h> 13 #include <linux/jhash.h> 14 #include <linux/kernel.h> 15 #include <linux/log2.h> 16 #include <linux/netdevice.h> 17 #include <linux/netfilter_bridge.h> 18 #include <linux/random.h> 19 #include <linux/rculist.h> 20 #include <linux/skbuff.h> 21 #include <linux/slab.h> 22 #include <linux/timer.h> 23 #include <linux/inetdevice.h> 24 #include <linux/mroute.h> 25 #include <net/ip.h> 26 #include <net/switchdev.h> 27 #if IS_ENABLED(CONFIG_IPV6) 28 #include <linux/icmpv6.h> 29 #include <net/ipv6.h> 30 #include <net/mld.h> 31 #include <net/ip6_checksum.h> 32 #include <net/addrconf.h> 33 #endif 34 #include <trace/events/bridge.h> 35 36 #include "br_private.h" 37 #include "br_private_mcast_eht.h" 38 39 static const struct rhashtable_params br_mdb_rht_params = { 40 .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode), 41 .key_offset = offsetof(struct net_bridge_mdb_entry, addr), 42 .key_len = sizeof(struct br_ip), 43 .automatic_shrinking = true, 44 }; 45 46 static const struct rhashtable_params br_sg_port_rht_params = { 47 .head_offset = offsetof(struct net_bridge_port_group, rhnode), 48 .key_offset = offsetof(struct net_bridge_port_group, key), 49 .key_len = sizeof(struct net_bridge_port_group_sg_key), 50 .automatic_shrinking = true, 51 }; 52 53 static void br_multicast_start_querier(struct net_bridge_mcast *brmctx, 54 struct bridge_mcast_own_query *query); 55 static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx, 56 struct net_bridge_mcast_port *pmctx); 57 static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx, 58 struct net_bridge_mcast_port *pmctx, 59 __be32 group, 60 __u16 vid, 61 const unsigned char *src); 62 static void br_multicast_port_group_rexmit(struct timer_list *t); 63 64 static void 65 br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted); 66 static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx, 67 struct net_bridge_mcast_port *pmctx); 68 #if IS_ENABLED(CONFIG_IPV6) 69 static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx, 70 struct net_bridge_mcast_port *pmctx, 71 const struct in6_addr *group, 72 __u16 vid, const unsigned char *src); 73 #endif 74 static struct net_bridge_port_group * 75 __br_multicast_add_group(struct net_bridge_mcast *brmctx, 76 struct net_bridge_mcast_port *pmctx, 77 struct br_ip *group, 78 const unsigned char *src, 79 u8 filter_mode, 80 bool igmpv2_mldv1, 81 bool blocked); 82 static void br_multicast_find_del_pg(struct net_bridge *br, 83 struct net_bridge_port_group *pg); 84 static void __br_multicast_stop(struct net_bridge_mcast *brmctx); 85 86 static int br_mc_disabled_update(struct net_device *dev, bool value, 87 struct netlink_ext_ack *extack); 88 89 static struct net_bridge_port_group * 90 br_sg_port_find(struct net_bridge *br, 91 struct net_bridge_port_group_sg_key *sg_p) 92 { 93 lockdep_assert_held_once(&br->multicast_lock); 94 95 return rhashtable_lookup_fast(&br->sg_port_tbl, sg_p, 96 br_sg_port_rht_params); 97 } 98 99 static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br, 100 struct br_ip *dst) 101 { 102 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params); 103 } 104 105 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br, 106 struct br_ip *dst) 107 { 108 struct net_bridge_mdb_entry *ent; 109 110 lockdep_assert_held_once(&br->multicast_lock); 111 112 rcu_read_lock(); 113 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params); 114 rcu_read_unlock(); 115 116 return ent; 117 } 118 119 static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br, 120 __be32 dst, __u16 vid) 121 { 122 struct br_ip br_dst; 123 124 memset(&br_dst, 0, sizeof(br_dst)); 125 br_dst.dst.ip4 = dst; 126 br_dst.proto = htons(ETH_P_IP); 127 br_dst.vid = vid; 128 129 return br_mdb_ip_get(br, &br_dst); 130 } 131 132 #if IS_ENABLED(CONFIG_IPV6) 133 static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br, 134 const struct in6_addr *dst, 135 __u16 vid) 136 { 137 struct br_ip br_dst; 138 139 memset(&br_dst, 0, sizeof(br_dst)); 140 br_dst.dst.ip6 = *dst; 141 br_dst.proto = htons(ETH_P_IPV6); 142 br_dst.vid = vid; 143 144 return br_mdb_ip_get(br, &br_dst); 145 } 146 #endif 147 148 struct net_bridge_mdb_entry * 149 br_mdb_entry_skb_get(struct net_bridge_mcast *brmctx, struct sk_buff *skb, 150 u16 vid) 151 { 152 struct net_bridge *br = brmctx->br; 153 struct br_ip ip; 154 155 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || 156 br_multicast_ctx_vlan_global_disabled(brmctx)) 157 return NULL; 158 159 if (BR_INPUT_SKB_CB(skb)->igmp) 160 return NULL; 161 162 memset(&ip, 0, sizeof(ip)); 163 ip.proto = skb->protocol; 164 ip.vid = vid; 165 166 switch (skb->protocol) { 167 case htons(ETH_P_IP): 168 ip.dst.ip4 = ip_hdr(skb)->daddr; 169 if (brmctx->multicast_igmp_version == 3) { 170 struct net_bridge_mdb_entry *mdb; 171 172 ip.src.ip4 = ip_hdr(skb)->saddr; 173 mdb = br_mdb_ip_get_rcu(br, &ip); 174 if (mdb) 175 return mdb; 176 ip.src.ip4 = 0; 177 } 178 break; 179 #if IS_ENABLED(CONFIG_IPV6) 180 case htons(ETH_P_IPV6): 181 ip.dst.ip6 = ipv6_hdr(skb)->daddr; 182 if (brmctx->multicast_mld_version == 2) { 183 struct net_bridge_mdb_entry *mdb; 184 185 ip.src.ip6 = ipv6_hdr(skb)->saddr; 186 mdb = br_mdb_ip_get_rcu(br, &ip); 187 if (mdb) 188 return mdb; 189 memset(&ip.src.ip6, 0, sizeof(ip.src.ip6)); 190 } 191 break; 192 #endif 193 default: 194 ip.proto = 0; 195 ether_addr_copy(ip.dst.mac_addr, eth_hdr(skb)->h_dest); 196 } 197 198 return br_mdb_ip_get_rcu(br, &ip); 199 } 200 201 /* IMPORTANT: this function must be used only when the contexts cannot be 202 * passed down (e.g. timer) and must be used for read-only purposes because 203 * the vlan snooping option can change, so it can return any context 204 * (non-vlan or vlan). Its initial intended purpose is to read timer values 205 * from the *current* context based on the option. At worst that could lead 206 * to inconsistent timers when the contexts are changed, i.e. src timer 207 * which needs to re-arm with a specific delay taken from the old context 208 */ 209 static struct net_bridge_mcast_port * 210 br_multicast_pg_to_port_ctx(const struct net_bridge_port_group *pg) 211 { 212 struct net_bridge_mcast_port *pmctx = &pg->key.port->multicast_ctx; 213 struct net_bridge_vlan *vlan; 214 215 lockdep_assert_held_once(&pg->key.port->br->multicast_lock); 216 217 /* if vlan snooping is disabled use the port's multicast context */ 218 if (!pg->key.addr.vid || 219 !br_opt_get(pg->key.port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) 220 goto out; 221 222 /* locking is tricky here, due to different rules for multicast and 223 * vlans we need to take rcu to find the vlan and make sure it has 224 * the BR_VLFLAG_MCAST_ENABLED flag set, it can only change under 225 * multicast_lock which must be already held here, so the vlan's pmctx 226 * can safely be used on return 227 */ 228 rcu_read_lock(); 229 vlan = br_vlan_find(nbp_vlan_group_rcu(pg->key.port), pg->key.addr.vid); 230 if (vlan && !br_multicast_port_ctx_vlan_disabled(&vlan->port_mcast_ctx)) 231 pmctx = &vlan->port_mcast_ctx; 232 else 233 pmctx = NULL; 234 rcu_read_unlock(); 235 out: 236 return pmctx; 237 } 238 239 static struct net_bridge_mcast_port * 240 br_multicast_port_vid_to_port_ctx(struct net_bridge_port *port, u16 vid) 241 { 242 struct net_bridge_mcast_port *pmctx = NULL; 243 struct net_bridge_vlan *vlan; 244 245 lockdep_assert_held_once(&port->br->multicast_lock); 246 247 if (!br_opt_get(port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) 248 return NULL; 249 250 /* Take RCU to access the vlan. */ 251 rcu_read_lock(); 252 253 vlan = br_vlan_find(nbp_vlan_group_rcu(port), vid); 254 if (vlan && !br_multicast_port_ctx_vlan_disabled(&vlan->port_mcast_ctx)) 255 pmctx = &vlan->port_mcast_ctx; 256 257 rcu_read_unlock(); 258 259 return pmctx; 260 } 261 262 /* when snooping we need to check if the contexts should be used 263 * in the following order: 264 * - if pmctx is non-NULL (port), check if it should be used 265 * - if pmctx is NULL (bridge), check if brmctx should be used 266 */ 267 static bool 268 br_multicast_ctx_should_use(const struct net_bridge_mcast *brmctx, 269 const struct net_bridge_mcast_port *pmctx) 270 { 271 if (!netif_running(brmctx->br->dev)) 272 return false; 273 274 if (pmctx) 275 return !br_multicast_port_ctx_state_disabled(pmctx); 276 else 277 return !br_multicast_ctx_vlan_disabled(brmctx); 278 } 279 280 static bool br_port_group_equal(struct net_bridge_port_group *p, 281 struct net_bridge_port *port, 282 const unsigned char *src) 283 { 284 if (p->key.port != port) 285 return false; 286 287 if (!(port->flags & BR_MULTICAST_TO_UNICAST)) 288 return true; 289 290 return ether_addr_equal(src, p->eth_addr); 291 } 292 293 static void __fwd_add_star_excl(struct net_bridge_mcast_port *pmctx, 294 struct net_bridge_port_group *pg, 295 struct br_ip *sg_ip) 296 { 297 struct net_bridge_port_group_sg_key sg_key; 298 struct net_bridge_port_group *src_pg; 299 struct net_bridge_mcast *brmctx; 300 301 memset(&sg_key, 0, sizeof(sg_key)); 302 brmctx = br_multicast_port_ctx_get_global(pmctx); 303 sg_key.port = pg->key.port; 304 sg_key.addr = *sg_ip; 305 if (br_sg_port_find(brmctx->br, &sg_key)) 306 return; 307 308 src_pg = __br_multicast_add_group(brmctx, pmctx, 309 sg_ip, pg->eth_addr, 310 MCAST_INCLUDE, false, false); 311 if (IS_ERR_OR_NULL(src_pg) || 312 src_pg->rt_protocol != RTPROT_KERNEL) 313 return; 314 315 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL; 316 } 317 318 static void __fwd_del_star_excl(struct net_bridge_port_group *pg, 319 struct br_ip *sg_ip) 320 { 321 struct net_bridge_port_group_sg_key sg_key; 322 struct net_bridge *br = pg->key.port->br; 323 struct net_bridge_port_group *src_pg; 324 325 memset(&sg_key, 0, sizeof(sg_key)); 326 sg_key.port = pg->key.port; 327 sg_key.addr = *sg_ip; 328 src_pg = br_sg_port_find(br, &sg_key); 329 if (!src_pg || !(src_pg->flags & MDB_PG_FLAGS_STAR_EXCL) || 330 src_pg->rt_protocol != RTPROT_KERNEL) 331 return; 332 333 br_multicast_find_del_pg(br, src_pg); 334 } 335 336 /* When a port group transitions to (or is added as) EXCLUDE we need to add it 337 * to all other ports' S,G entries which are not blocked by the current group 338 * for proper replication, the assumption is that any S,G blocked entries 339 * are already added so the S,G,port lookup should skip them. 340 * When a port group transitions from EXCLUDE -> INCLUDE mode or is being 341 * deleted we need to remove it from all ports' S,G entries where it was 342 * automatically installed before (i.e. where it's MDB_PG_FLAGS_STAR_EXCL). 343 */ 344 void br_multicast_star_g_handle_mode(struct net_bridge_port_group *pg, 345 u8 filter_mode) 346 { 347 struct net_bridge *br = pg->key.port->br; 348 struct net_bridge_port_group *pg_lst; 349 struct net_bridge_mcast_port *pmctx; 350 struct net_bridge_mdb_entry *mp; 351 struct br_ip sg_ip; 352 353 if (WARN_ON(!br_multicast_is_star_g(&pg->key.addr))) 354 return; 355 356 mp = br_mdb_ip_get(br, &pg->key.addr); 357 if (!mp) 358 return; 359 pmctx = br_multicast_pg_to_port_ctx(pg); 360 if (!pmctx) 361 return; 362 363 memset(&sg_ip, 0, sizeof(sg_ip)); 364 sg_ip = pg->key.addr; 365 366 for (pg_lst = mlock_dereference(mp->ports, br); 367 pg_lst; 368 pg_lst = mlock_dereference(pg_lst->next, br)) { 369 struct net_bridge_group_src *src_ent; 370 371 if (pg_lst == pg) 372 continue; 373 hlist_for_each_entry(src_ent, &pg_lst->src_list, node) { 374 if (!(src_ent->flags & BR_SGRP_F_INSTALLED)) 375 continue; 376 sg_ip.src = src_ent->addr.src; 377 switch (filter_mode) { 378 case MCAST_INCLUDE: 379 __fwd_del_star_excl(pg, &sg_ip); 380 break; 381 case MCAST_EXCLUDE: 382 __fwd_add_star_excl(pmctx, pg, &sg_ip); 383 break; 384 } 385 } 386 } 387 } 388 389 /* called when adding a new S,G with host_joined == false by default */ 390 static void br_multicast_sg_host_state(struct net_bridge_mdb_entry *star_mp, 391 struct net_bridge_port_group *sg) 392 { 393 struct net_bridge_mdb_entry *sg_mp; 394 395 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr))) 396 return; 397 if (!star_mp->host_joined) 398 return; 399 400 sg_mp = br_mdb_ip_get(star_mp->br, &sg->key.addr); 401 if (!sg_mp) 402 return; 403 sg_mp->host_joined = true; 404 } 405 406 /* set the host_joined state of all of *,G's S,G entries */ 407 static void br_multicast_star_g_host_state(struct net_bridge_mdb_entry *star_mp) 408 { 409 struct net_bridge *br = star_mp->br; 410 struct net_bridge_mdb_entry *sg_mp; 411 struct net_bridge_port_group *pg; 412 struct br_ip sg_ip; 413 414 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr))) 415 return; 416 417 memset(&sg_ip, 0, sizeof(sg_ip)); 418 sg_ip = star_mp->addr; 419 for (pg = mlock_dereference(star_mp->ports, br); 420 pg; 421 pg = mlock_dereference(pg->next, br)) { 422 struct net_bridge_group_src *src_ent; 423 424 hlist_for_each_entry(src_ent, &pg->src_list, node) { 425 if (!(src_ent->flags & BR_SGRP_F_INSTALLED)) 426 continue; 427 sg_ip.src = src_ent->addr.src; 428 sg_mp = br_mdb_ip_get(br, &sg_ip); 429 if (!sg_mp) 430 continue; 431 sg_mp->host_joined = star_mp->host_joined; 432 } 433 } 434 } 435 436 static void br_multicast_sg_del_exclude_ports(struct net_bridge_mdb_entry *sgmp) 437 { 438 struct net_bridge_port_group __rcu **pp; 439 struct net_bridge_port_group *p; 440 441 /* *,G exclude ports are only added to S,G entries */ 442 if (WARN_ON(br_multicast_is_star_g(&sgmp->addr))) 443 return; 444 445 /* we need the STAR_EXCLUDE ports if there are non-STAR_EXCLUDE ports 446 * we should ignore perm entries since they're managed by user-space 447 */ 448 for (pp = &sgmp->ports; 449 (p = mlock_dereference(*pp, sgmp->br)) != NULL; 450 pp = &p->next) 451 if (!(p->flags & (MDB_PG_FLAGS_STAR_EXCL | 452 MDB_PG_FLAGS_PERMANENT))) 453 return; 454 455 /* currently the host can only have joined the *,G which means 456 * we treat it as EXCLUDE {}, so for an S,G it's considered a 457 * STAR_EXCLUDE entry and we can safely leave it 458 */ 459 sgmp->host_joined = false; 460 461 for (pp = &sgmp->ports; 462 (p = mlock_dereference(*pp, sgmp->br)) != NULL;) { 463 if (!(p->flags & MDB_PG_FLAGS_PERMANENT)) 464 br_multicast_del_pg(sgmp, p, pp); 465 else 466 pp = &p->next; 467 } 468 } 469 470 void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp, 471 struct net_bridge_port_group *sg) 472 { 473 struct net_bridge_port_group_sg_key sg_key; 474 struct net_bridge *br = star_mp->br; 475 struct net_bridge_mcast_port *pmctx; 476 struct net_bridge_port_group *pg; 477 struct net_bridge_mcast *brmctx; 478 479 if (WARN_ON(br_multicast_is_star_g(&sg->key.addr))) 480 return; 481 if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr))) 482 return; 483 484 br_multicast_sg_host_state(star_mp, sg); 485 memset(&sg_key, 0, sizeof(sg_key)); 486 sg_key.addr = sg->key.addr; 487 /* we need to add all exclude ports to the S,G */ 488 for (pg = mlock_dereference(star_mp->ports, br); 489 pg; 490 pg = mlock_dereference(pg->next, br)) { 491 struct net_bridge_port_group *src_pg; 492 493 if (pg == sg || pg->filter_mode == MCAST_INCLUDE) 494 continue; 495 496 sg_key.port = pg->key.port; 497 if (br_sg_port_find(br, &sg_key)) 498 continue; 499 500 pmctx = br_multicast_pg_to_port_ctx(pg); 501 if (!pmctx) 502 continue; 503 brmctx = br_multicast_port_ctx_get_global(pmctx); 504 505 src_pg = __br_multicast_add_group(brmctx, pmctx, 506 &sg->key.addr, 507 sg->eth_addr, 508 MCAST_INCLUDE, false, false); 509 if (IS_ERR_OR_NULL(src_pg) || 510 src_pg->rt_protocol != RTPROT_KERNEL) 511 continue; 512 src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL; 513 } 514 } 515 516 static void br_multicast_fwd_src_add(struct net_bridge_group_src *src) 517 { 518 struct net_bridge_mdb_entry *star_mp; 519 struct net_bridge_mcast_port *pmctx; 520 struct net_bridge_port_group *sg; 521 struct net_bridge_mcast *brmctx; 522 struct br_ip sg_ip; 523 524 if (src->flags & BR_SGRP_F_INSTALLED) 525 return; 526 527 memset(&sg_ip, 0, sizeof(sg_ip)); 528 pmctx = br_multicast_pg_to_port_ctx(src->pg); 529 if (!pmctx) 530 return; 531 brmctx = br_multicast_port_ctx_get_global(pmctx); 532 sg_ip = src->pg->key.addr; 533 sg_ip.src = src->addr.src; 534 535 sg = __br_multicast_add_group(brmctx, pmctx, &sg_ip, 536 src->pg->eth_addr, MCAST_INCLUDE, false, 537 !timer_pending(&src->timer)); 538 if (IS_ERR_OR_NULL(sg)) 539 return; 540 src->flags |= BR_SGRP_F_INSTALLED; 541 sg->flags &= ~MDB_PG_FLAGS_STAR_EXCL; 542 543 /* if it was added by user-space as perm we can skip next steps */ 544 if (sg->rt_protocol != RTPROT_KERNEL && 545 (sg->flags & MDB_PG_FLAGS_PERMANENT)) 546 return; 547 548 /* the kernel is now responsible for removing this S,G */ 549 timer_delete(&sg->timer); 550 star_mp = br_mdb_ip_get(src->br, &src->pg->key.addr); 551 if (!star_mp) 552 return; 553 554 br_multicast_sg_add_exclude_ports(star_mp, sg); 555 } 556 557 static void br_multicast_fwd_src_remove(struct net_bridge_group_src *src, 558 bool fastleave) 559 { 560 struct net_bridge_port_group *p, *pg = src->pg; 561 struct net_bridge_port_group __rcu **pp; 562 struct net_bridge_mdb_entry *mp; 563 struct br_ip sg_ip; 564 565 memset(&sg_ip, 0, sizeof(sg_ip)); 566 sg_ip = pg->key.addr; 567 sg_ip.src = src->addr.src; 568 569 mp = br_mdb_ip_get(src->br, &sg_ip); 570 if (!mp) 571 return; 572 573 for (pp = &mp->ports; 574 (p = mlock_dereference(*pp, src->br)) != NULL; 575 pp = &p->next) { 576 if (!br_port_group_equal(p, pg->key.port, pg->eth_addr)) 577 continue; 578 579 if (p->rt_protocol != RTPROT_KERNEL && 580 (p->flags & MDB_PG_FLAGS_PERMANENT) && 581 !(src->flags & BR_SGRP_F_USER_ADDED)) 582 break; 583 584 if (fastleave) 585 p->flags |= MDB_PG_FLAGS_FAST_LEAVE; 586 br_multicast_del_pg(mp, p, pp); 587 break; 588 } 589 src->flags &= ~BR_SGRP_F_INSTALLED; 590 } 591 592 /* install S,G and based on src's timer enable or disable forwarding */ 593 static void br_multicast_fwd_src_handle(struct net_bridge_group_src *src) 594 { 595 struct net_bridge_port_group_sg_key sg_key; 596 struct net_bridge_port_group *sg; 597 u8 old_flags; 598 599 br_multicast_fwd_src_add(src); 600 601 memset(&sg_key, 0, sizeof(sg_key)); 602 sg_key.addr = src->pg->key.addr; 603 sg_key.addr.src = src->addr.src; 604 sg_key.port = src->pg->key.port; 605 606 sg = br_sg_port_find(src->br, &sg_key); 607 if (!sg || (sg->flags & MDB_PG_FLAGS_PERMANENT)) 608 return; 609 610 old_flags = sg->flags; 611 if (timer_pending(&src->timer)) 612 sg->flags &= ~MDB_PG_FLAGS_BLOCKED; 613 else 614 sg->flags |= MDB_PG_FLAGS_BLOCKED; 615 616 if (old_flags != sg->flags) { 617 struct net_bridge_mdb_entry *sg_mp; 618 619 sg_mp = br_mdb_ip_get(src->br, &sg_key.addr); 620 if (!sg_mp) 621 return; 622 br_mdb_notify(src->br->dev, sg_mp, sg, RTM_NEWMDB); 623 } 624 } 625 626 static void br_multicast_destroy_mdb_entry(struct net_bridge_mcast_gc *gc) 627 { 628 struct net_bridge_mdb_entry *mp; 629 630 mp = container_of(gc, struct net_bridge_mdb_entry, mcast_gc); 631 WARN_ON(!hlist_unhashed(&mp->mdb_node)); 632 WARN_ON(mp->ports); 633 634 timer_shutdown_sync(&mp->timer); 635 kfree_rcu(mp, rcu); 636 } 637 638 static void br_multicast_del_mdb_entry(struct net_bridge_mdb_entry *mp) 639 { 640 struct net_bridge *br = mp->br; 641 642 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode, 643 br_mdb_rht_params); 644 hlist_del_init_rcu(&mp->mdb_node); 645 hlist_add_head(&mp->mcast_gc.gc_node, &br->mcast_gc_list); 646 queue_work(system_long_wq, &br->mcast_gc_work); 647 } 648 649 static void br_multicast_group_expired(struct timer_list *t) 650 { 651 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer); 652 struct net_bridge *br = mp->br; 653 654 spin_lock(&br->multicast_lock); 655 if (hlist_unhashed(&mp->mdb_node) || !netif_running(br->dev) || 656 timer_pending(&mp->timer)) 657 goto out; 658 659 br_multicast_host_leave(mp, true); 660 661 if (mp->ports) 662 goto out; 663 br_multicast_del_mdb_entry(mp); 664 out: 665 spin_unlock(&br->multicast_lock); 666 } 667 668 static void br_multicast_destroy_group_src(struct net_bridge_mcast_gc *gc) 669 { 670 struct net_bridge_group_src *src; 671 672 src = container_of(gc, struct net_bridge_group_src, mcast_gc); 673 WARN_ON(!hlist_unhashed(&src->node)); 674 675 timer_shutdown_sync(&src->timer); 676 kfree_rcu(src, rcu); 677 } 678 679 void __br_multicast_del_group_src(struct net_bridge_group_src *src) 680 { 681 struct net_bridge *br = src->pg->key.port->br; 682 683 hlist_del_init_rcu(&src->node); 684 src->pg->src_ents--; 685 hlist_add_head(&src->mcast_gc.gc_node, &br->mcast_gc_list); 686 queue_work(system_long_wq, &br->mcast_gc_work); 687 } 688 689 void br_multicast_del_group_src(struct net_bridge_group_src *src, 690 bool fastleave) 691 { 692 br_multicast_fwd_src_remove(src, fastleave); 693 __br_multicast_del_group_src(src); 694 } 695 696 static int 697 br_multicast_port_ngroups_inc_one(struct net_bridge_mcast_port *pmctx, 698 struct netlink_ext_ack *extack, 699 const char *what) 700 { 701 u32 max = READ_ONCE(pmctx->mdb_max_entries); 702 u32 n = READ_ONCE(pmctx->mdb_n_entries); 703 704 if (max && n >= max) { 705 NL_SET_ERR_MSG_FMT_MOD(extack, "%s is already in %u groups, and mcast_max_groups=%u", 706 what, n, max); 707 return -E2BIG; 708 } 709 710 WRITE_ONCE(pmctx->mdb_n_entries, n + 1); 711 return 0; 712 } 713 714 static void br_multicast_port_ngroups_dec_one(struct net_bridge_mcast_port *pmctx) 715 { 716 u32 n = READ_ONCE(pmctx->mdb_n_entries); 717 718 WARN_ON_ONCE(n == 0); 719 WRITE_ONCE(pmctx->mdb_n_entries, n - 1); 720 } 721 722 static int br_multicast_port_ngroups_inc(struct net_bridge_port *port, 723 const struct br_ip *group, 724 struct netlink_ext_ack *extack) 725 { 726 struct net_bridge_mcast_port *pmctx; 727 int err; 728 729 lockdep_assert_held_once(&port->br->multicast_lock); 730 731 /* Always count on the port context. */ 732 err = br_multicast_port_ngroups_inc_one(&port->multicast_ctx, extack, 733 "Port"); 734 if (err) { 735 trace_br_mdb_full(port->dev, group); 736 return err; 737 } 738 739 /* Only count on the VLAN context if VID is given, and if snooping on 740 * that VLAN is enabled. 741 */ 742 if (!group->vid) 743 return 0; 744 745 pmctx = br_multicast_port_vid_to_port_ctx(port, group->vid); 746 if (!pmctx) 747 return 0; 748 749 err = br_multicast_port_ngroups_inc_one(pmctx, extack, "Port-VLAN"); 750 if (err) { 751 trace_br_mdb_full(port->dev, group); 752 goto dec_one_out; 753 } 754 755 return 0; 756 757 dec_one_out: 758 br_multicast_port_ngroups_dec_one(&port->multicast_ctx); 759 return err; 760 } 761 762 static void br_multicast_port_ngroups_dec(struct net_bridge_port *port, u16 vid) 763 { 764 struct net_bridge_mcast_port *pmctx; 765 766 lockdep_assert_held_once(&port->br->multicast_lock); 767 768 if (vid) { 769 pmctx = br_multicast_port_vid_to_port_ctx(port, vid); 770 if (pmctx) 771 br_multicast_port_ngroups_dec_one(pmctx); 772 } 773 br_multicast_port_ngroups_dec_one(&port->multicast_ctx); 774 } 775 776 u32 br_multicast_ngroups_get(const struct net_bridge_mcast_port *pmctx) 777 { 778 return READ_ONCE(pmctx->mdb_n_entries); 779 } 780 781 void br_multicast_ngroups_set_max(struct net_bridge_mcast_port *pmctx, u32 max) 782 { 783 WRITE_ONCE(pmctx->mdb_max_entries, max); 784 } 785 786 u32 br_multicast_ngroups_get_max(const struct net_bridge_mcast_port *pmctx) 787 { 788 return READ_ONCE(pmctx->mdb_max_entries); 789 } 790 791 static void br_multicast_destroy_port_group(struct net_bridge_mcast_gc *gc) 792 { 793 struct net_bridge_port_group *pg; 794 795 pg = container_of(gc, struct net_bridge_port_group, mcast_gc); 796 WARN_ON(!hlist_unhashed(&pg->mglist)); 797 WARN_ON(!hlist_empty(&pg->src_list)); 798 799 timer_shutdown_sync(&pg->rexmit_timer); 800 timer_shutdown_sync(&pg->timer); 801 kfree_rcu(pg, rcu); 802 } 803 804 void br_multicast_del_pg(struct net_bridge_mdb_entry *mp, 805 struct net_bridge_port_group *pg, 806 struct net_bridge_port_group __rcu **pp) 807 { 808 struct net_bridge *br = pg->key.port->br; 809 struct net_bridge_group_src *ent; 810 struct hlist_node *tmp; 811 812 rcu_assign_pointer(*pp, pg->next); 813 hlist_del_init(&pg->mglist); 814 br_multicast_eht_clean_sets(pg); 815 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) 816 br_multicast_del_group_src(ent, false); 817 br_mdb_notify(br->dev, mp, pg, RTM_DELMDB); 818 if (!br_multicast_is_star_g(&mp->addr)) { 819 rhashtable_remove_fast(&br->sg_port_tbl, &pg->rhnode, 820 br_sg_port_rht_params); 821 br_multicast_sg_del_exclude_ports(mp); 822 } else { 823 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE); 824 } 825 br_multicast_port_ngroups_dec(pg->key.port, pg->key.addr.vid); 826 hlist_add_head(&pg->mcast_gc.gc_node, &br->mcast_gc_list); 827 queue_work(system_long_wq, &br->mcast_gc_work); 828 829 if (!mp->ports && !mp->host_joined && netif_running(br->dev)) 830 mod_timer(&mp->timer, jiffies); 831 } 832 833 static void br_multicast_find_del_pg(struct net_bridge *br, 834 struct net_bridge_port_group *pg) 835 { 836 struct net_bridge_port_group __rcu **pp; 837 struct net_bridge_mdb_entry *mp; 838 struct net_bridge_port_group *p; 839 840 mp = br_mdb_ip_get(br, &pg->key.addr); 841 if (WARN_ON(!mp)) 842 return; 843 844 for (pp = &mp->ports; 845 (p = mlock_dereference(*pp, br)) != NULL; 846 pp = &p->next) { 847 if (p != pg) 848 continue; 849 850 br_multicast_del_pg(mp, pg, pp); 851 return; 852 } 853 854 WARN_ON(1); 855 } 856 857 static void br_multicast_port_group_expired(struct timer_list *t) 858 { 859 struct net_bridge_port_group *pg = from_timer(pg, t, timer); 860 struct net_bridge_group_src *src_ent; 861 struct net_bridge *br = pg->key.port->br; 862 struct hlist_node *tmp; 863 bool changed; 864 865 spin_lock(&br->multicast_lock); 866 if (!netif_running(br->dev) || timer_pending(&pg->timer) || 867 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT) 868 goto out; 869 870 changed = !!(pg->filter_mode == MCAST_EXCLUDE); 871 pg->filter_mode = MCAST_INCLUDE; 872 hlist_for_each_entry_safe(src_ent, tmp, &pg->src_list, node) { 873 if (!timer_pending(&src_ent->timer)) { 874 br_multicast_del_group_src(src_ent, false); 875 changed = true; 876 } 877 } 878 879 if (hlist_empty(&pg->src_list)) { 880 br_multicast_find_del_pg(br, pg); 881 } else if (changed) { 882 struct net_bridge_mdb_entry *mp = br_mdb_ip_get(br, &pg->key.addr); 883 884 if (changed && br_multicast_is_star_g(&pg->key.addr)) 885 br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE); 886 887 if (WARN_ON(!mp)) 888 goto out; 889 br_mdb_notify(br->dev, mp, pg, RTM_NEWMDB); 890 } 891 out: 892 spin_unlock(&br->multicast_lock); 893 } 894 895 static void br_multicast_gc(struct hlist_head *head) 896 { 897 struct net_bridge_mcast_gc *gcent; 898 struct hlist_node *tmp; 899 900 hlist_for_each_entry_safe(gcent, tmp, head, gc_node) { 901 hlist_del_init(&gcent->gc_node); 902 gcent->destroy(gcent); 903 } 904 } 905 906 static void __br_multicast_query_handle_vlan(struct net_bridge_mcast *brmctx, 907 struct net_bridge_mcast_port *pmctx, 908 struct sk_buff *skb) 909 { 910 struct net_bridge_vlan *vlan = NULL; 911 912 if (pmctx && br_multicast_port_ctx_is_vlan(pmctx)) 913 vlan = pmctx->vlan; 914 else if (br_multicast_ctx_is_vlan(brmctx)) 915 vlan = brmctx->vlan; 916 917 if (vlan && !(vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED)) { 918 u16 vlan_proto; 919 920 if (br_vlan_get_proto(brmctx->br->dev, &vlan_proto) != 0) 921 return; 922 __vlan_hwaccel_put_tag(skb, htons(vlan_proto), vlan->vid); 923 } 924 } 925 926 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge_mcast *brmctx, 927 struct net_bridge_mcast_port *pmctx, 928 struct net_bridge_port_group *pg, 929 __be32 ip_dst, __be32 group, 930 bool with_srcs, bool over_lmqt, 931 u8 sflag, u8 *igmp_type, 932 bool *need_rexmit) 933 { 934 struct net_bridge_port *p = pg ? pg->key.port : NULL; 935 struct net_bridge_group_src *ent; 936 size_t pkt_size, igmp_hdr_size; 937 unsigned long now = jiffies; 938 struct igmpv3_query *ihv3; 939 void *csum_start = NULL; 940 __sum16 *csum = NULL; 941 struct sk_buff *skb; 942 struct igmphdr *ih; 943 struct ethhdr *eth; 944 unsigned long lmqt; 945 struct iphdr *iph; 946 u16 lmqt_srcs = 0; 947 948 igmp_hdr_size = sizeof(*ih); 949 if (brmctx->multicast_igmp_version == 3) { 950 igmp_hdr_size = sizeof(*ihv3); 951 if (pg && with_srcs) { 952 lmqt = now + (brmctx->multicast_last_member_interval * 953 brmctx->multicast_last_member_count); 954 hlist_for_each_entry(ent, &pg->src_list, node) { 955 if (over_lmqt == time_after(ent->timer.expires, 956 lmqt) && 957 ent->src_query_rexmit_cnt > 0) 958 lmqt_srcs++; 959 } 960 961 if (!lmqt_srcs) 962 return NULL; 963 igmp_hdr_size += lmqt_srcs * sizeof(__be32); 964 } 965 } 966 967 pkt_size = sizeof(*eth) + sizeof(*iph) + 4 + igmp_hdr_size; 968 if ((p && pkt_size > p->dev->mtu) || 969 pkt_size > brmctx->br->dev->mtu) 970 return NULL; 971 972 skb = netdev_alloc_skb_ip_align(brmctx->br->dev, pkt_size); 973 if (!skb) 974 goto out; 975 976 __br_multicast_query_handle_vlan(brmctx, pmctx, skb); 977 skb->protocol = htons(ETH_P_IP); 978 979 skb_reset_mac_header(skb); 980 eth = eth_hdr(skb); 981 982 ether_addr_copy(eth->h_source, brmctx->br->dev->dev_addr); 983 ip_eth_mc_map(ip_dst, eth->h_dest); 984 eth->h_proto = htons(ETH_P_IP); 985 skb_put(skb, sizeof(*eth)); 986 987 skb_set_network_header(skb, skb->len); 988 iph = ip_hdr(skb); 989 iph->tot_len = htons(pkt_size - sizeof(*eth)); 990 991 iph->version = 4; 992 iph->ihl = 6; 993 iph->tos = 0xc0; 994 iph->id = 0; 995 iph->frag_off = htons(IP_DF); 996 iph->ttl = 1; 997 iph->protocol = IPPROTO_IGMP; 998 iph->saddr = br_opt_get(brmctx->br, BROPT_MULTICAST_QUERY_USE_IFADDR) ? 999 inet_select_addr(brmctx->br->dev, 0, RT_SCOPE_LINK) : 0; 1000 iph->daddr = ip_dst; 1001 ((u8 *)&iph[1])[0] = IPOPT_RA; 1002 ((u8 *)&iph[1])[1] = 4; 1003 ((u8 *)&iph[1])[2] = 0; 1004 ((u8 *)&iph[1])[3] = 0; 1005 ip_send_check(iph); 1006 skb_put(skb, 24); 1007 1008 skb_set_transport_header(skb, skb->len); 1009 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY; 1010 1011 switch (brmctx->multicast_igmp_version) { 1012 case 2: 1013 ih = igmp_hdr(skb); 1014 ih->type = IGMP_HOST_MEMBERSHIP_QUERY; 1015 ih->code = (group ? brmctx->multicast_last_member_interval : 1016 brmctx->multicast_query_response_interval) / 1017 (HZ / IGMP_TIMER_SCALE); 1018 ih->group = group; 1019 ih->csum = 0; 1020 csum = &ih->csum; 1021 csum_start = (void *)ih; 1022 break; 1023 case 3: 1024 ihv3 = igmpv3_query_hdr(skb); 1025 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY; 1026 ihv3->code = (group ? brmctx->multicast_last_member_interval : 1027 brmctx->multicast_query_response_interval) / 1028 (HZ / IGMP_TIMER_SCALE); 1029 ihv3->group = group; 1030 ihv3->qqic = brmctx->multicast_query_interval / HZ; 1031 ihv3->nsrcs = htons(lmqt_srcs); 1032 ihv3->resv = 0; 1033 ihv3->suppress = sflag; 1034 ihv3->qrv = 2; 1035 ihv3->csum = 0; 1036 csum = &ihv3->csum; 1037 csum_start = (void *)ihv3; 1038 if (!pg || !with_srcs) 1039 break; 1040 1041 lmqt_srcs = 0; 1042 hlist_for_each_entry(ent, &pg->src_list, node) { 1043 if (over_lmqt == time_after(ent->timer.expires, 1044 lmqt) && 1045 ent->src_query_rexmit_cnt > 0) { 1046 ihv3->srcs[lmqt_srcs++] = ent->addr.src.ip4; 1047 ent->src_query_rexmit_cnt--; 1048 if (need_rexmit && ent->src_query_rexmit_cnt) 1049 *need_rexmit = true; 1050 } 1051 } 1052 if (WARN_ON(lmqt_srcs != ntohs(ihv3->nsrcs))) { 1053 kfree_skb(skb); 1054 return NULL; 1055 } 1056 break; 1057 } 1058 1059 if (WARN_ON(!csum || !csum_start)) { 1060 kfree_skb(skb); 1061 return NULL; 1062 } 1063 1064 *csum = ip_compute_csum(csum_start, igmp_hdr_size); 1065 skb_put(skb, igmp_hdr_size); 1066 __skb_pull(skb, sizeof(*eth)); 1067 1068 out: 1069 return skb; 1070 } 1071 1072 #if IS_ENABLED(CONFIG_IPV6) 1073 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge_mcast *brmctx, 1074 struct net_bridge_mcast_port *pmctx, 1075 struct net_bridge_port_group *pg, 1076 const struct in6_addr *ip6_dst, 1077 const struct in6_addr *group, 1078 bool with_srcs, bool over_llqt, 1079 u8 sflag, u8 *igmp_type, 1080 bool *need_rexmit) 1081 { 1082 struct net_bridge_port *p = pg ? pg->key.port : NULL; 1083 struct net_bridge_group_src *ent; 1084 size_t pkt_size, mld_hdr_size; 1085 unsigned long now = jiffies; 1086 struct mld2_query *mld2q; 1087 void *csum_start = NULL; 1088 unsigned long interval; 1089 __sum16 *csum = NULL; 1090 struct ipv6hdr *ip6h; 1091 struct mld_msg *mldq; 1092 struct sk_buff *skb; 1093 unsigned long llqt; 1094 struct ethhdr *eth; 1095 u16 llqt_srcs = 0; 1096 u8 *hopopt; 1097 1098 mld_hdr_size = sizeof(*mldq); 1099 if (brmctx->multicast_mld_version == 2) { 1100 mld_hdr_size = sizeof(*mld2q); 1101 if (pg && with_srcs) { 1102 llqt = now + (brmctx->multicast_last_member_interval * 1103 brmctx->multicast_last_member_count); 1104 hlist_for_each_entry(ent, &pg->src_list, node) { 1105 if (over_llqt == time_after(ent->timer.expires, 1106 llqt) && 1107 ent->src_query_rexmit_cnt > 0) 1108 llqt_srcs++; 1109 } 1110 1111 if (!llqt_srcs) 1112 return NULL; 1113 mld_hdr_size += llqt_srcs * sizeof(struct in6_addr); 1114 } 1115 } 1116 1117 pkt_size = sizeof(*eth) + sizeof(*ip6h) + 8 + mld_hdr_size; 1118 if ((p && pkt_size > p->dev->mtu) || 1119 pkt_size > brmctx->br->dev->mtu) 1120 return NULL; 1121 1122 skb = netdev_alloc_skb_ip_align(brmctx->br->dev, pkt_size); 1123 if (!skb) 1124 goto out; 1125 1126 __br_multicast_query_handle_vlan(brmctx, pmctx, skb); 1127 skb->protocol = htons(ETH_P_IPV6); 1128 1129 /* Ethernet header */ 1130 skb_reset_mac_header(skb); 1131 eth = eth_hdr(skb); 1132 1133 ether_addr_copy(eth->h_source, brmctx->br->dev->dev_addr); 1134 eth->h_proto = htons(ETH_P_IPV6); 1135 skb_put(skb, sizeof(*eth)); 1136 1137 /* IPv6 header + HbH option */ 1138 skb_set_network_header(skb, skb->len); 1139 ip6h = ipv6_hdr(skb); 1140 1141 *(__force __be32 *)ip6h = htonl(0x60000000); 1142 ip6h->payload_len = htons(8 + mld_hdr_size); 1143 ip6h->nexthdr = IPPROTO_HOPOPTS; 1144 ip6h->hop_limit = 1; 1145 ip6h->daddr = *ip6_dst; 1146 if (ipv6_dev_get_saddr(dev_net(brmctx->br->dev), brmctx->br->dev, 1147 &ip6h->daddr, 0, &ip6h->saddr)) { 1148 kfree_skb(skb); 1149 br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, false); 1150 return NULL; 1151 } 1152 1153 br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, true); 1154 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 1155 1156 hopopt = (u8 *)(ip6h + 1); 1157 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ 1158 hopopt[1] = 0; /* length of HbH */ 1159 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ 1160 hopopt[3] = 2; /* Length of RA Option */ 1161 hopopt[4] = 0; /* Type = 0x0000 (MLD) */ 1162 hopopt[5] = 0; 1163 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ 1164 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ 1165 1166 skb_put(skb, sizeof(*ip6h) + 8); 1167 1168 /* ICMPv6 */ 1169 skb_set_transport_header(skb, skb->len); 1170 interval = ipv6_addr_any(group) ? 1171 brmctx->multicast_query_response_interval : 1172 brmctx->multicast_last_member_interval; 1173 *igmp_type = ICMPV6_MGM_QUERY; 1174 switch (brmctx->multicast_mld_version) { 1175 case 1: 1176 mldq = (struct mld_msg *)icmp6_hdr(skb); 1177 mldq->mld_type = ICMPV6_MGM_QUERY; 1178 mldq->mld_code = 0; 1179 mldq->mld_cksum = 0; 1180 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); 1181 mldq->mld_reserved = 0; 1182 mldq->mld_mca = *group; 1183 csum = &mldq->mld_cksum; 1184 csum_start = (void *)mldq; 1185 break; 1186 case 2: 1187 mld2q = (struct mld2_query *)icmp6_hdr(skb); 1188 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval)); 1189 mld2q->mld2q_type = ICMPV6_MGM_QUERY; 1190 mld2q->mld2q_code = 0; 1191 mld2q->mld2q_cksum = 0; 1192 mld2q->mld2q_resv1 = 0; 1193 mld2q->mld2q_resv2 = 0; 1194 mld2q->mld2q_suppress = sflag; 1195 mld2q->mld2q_qrv = 2; 1196 mld2q->mld2q_nsrcs = htons(llqt_srcs); 1197 mld2q->mld2q_qqic = brmctx->multicast_query_interval / HZ; 1198 mld2q->mld2q_mca = *group; 1199 csum = &mld2q->mld2q_cksum; 1200 csum_start = (void *)mld2q; 1201 if (!pg || !with_srcs) 1202 break; 1203 1204 llqt_srcs = 0; 1205 hlist_for_each_entry(ent, &pg->src_list, node) { 1206 if (over_llqt == time_after(ent->timer.expires, 1207 llqt) && 1208 ent->src_query_rexmit_cnt > 0) { 1209 mld2q->mld2q_srcs[llqt_srcs++] = ent->addr.src.ip6; 1210 ent->src_query_rexmit_cnt--; 1211 if (need_rexmit && ent->src_query_rexmit_cnt) 1212 *need_rexmit = true; 1213 } 1214 } 1215 if (WARN_ON(llqt_srcs != ntohs(mld2q->mld2q_nsrcs))) { 1216 kfree_skb(skb); 1217 return NULL; 1218 } 1219 break; 1220 } 1221 1222 if (WARN_ON(!csum || !csum_start)) { 1223 kfree_skb(skb); 1224 return NULL; 1225 } 1226 1227 *csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, mld_hdr_size, 1228 IPPROTO_ICMPV6, 1229 csum_partial(csum_start, mld_hdr_size, 0)); 1230 skb_put(skb, mld_hdr_size); 1231 __skb_pull(skb, sizeof(*eth)); 1232 1233 out: 1234 return skb; 1235 } 1236 #endif 1237 1238 static struct sk_buff *br_multicast_alloc_query(struct net_bridge_mcast *brmctx, 1239 struct net_bridge_mcast_port *pmctx, 1240 struct net_bridge_port_group *pg, 1241 struct br_ip *ip_dst, 1242 struct br_ip *group, 1243 bool with_srcs, bool over_lmqt, 1244 u8 sflag, u8 *igmp_type, 1245 bool *need_rexmit) 1246 { 1247 __be32 ip4_dst; 1248 1249 switch (group->proto) { 1250 case htons(ETH_P_IP): 1251 ip4_dst = ip_dst ? ip_dst->dst.ip4 : htonl(INADDR_ALLHOSTS_GROUP); 1252 return br_ip4_multicast_alloc_query(brmctx, pmctx, pg, 1253 ip4_dst, group->dst.ip4, 1254 with_srcs, over_lmqt, 1255 sflag, igmp_type, 1256 need_rexmit); 1257 #if IS_ENABLED(CONFIG_IPV6) 1258 case htons(ETH_P_IPV6): { 1259 struct in6_addr ip6_dst; 1260 1261 if (ip_dst) 1262 ip6_dst = ip_dst->dst.ip6; 1263 else 1264 ipv6_addr_set(&ip6_dst, htonl(0xff020000), 0, 0, 1265 htonl(1)); 1266 1267 return br_ip6_multicast_alloc_query(brmctx, pmctx, pg, 1268 &ip6_dst, &group->dst.ip6, 1269 with_srcs, over_lmqt, 1270 sflag, igmp_type, 1271 need_rexmit); 1272 } 1273 #endif 1274 } 1275 return NULL; 1276 } 1277 1278 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, 1279 struct br_ip *group) 1280 { 1281 struct net_bridge_mdb_entry *mp; 1282 int err; 1283 1284 mp = br_mdb_ip_get(br, group); 1285 if (mp) 1286 return mp; 1287 1288 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) { 1289 trace_br_mdb_full(br->dev, group); 1290 br_mc_disabled_update(br->dev, false, NULL); 1291 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false); 1292 return ERR_PTR(-E2BIG); 1293 } 1294 1295 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 1296 if (unlikely(!mp)) 1297 return ERR_PTR(-ENOMEM); 1298 1299 mp->br = br; 1300 mp->addr = *group; 1301 mp->mcast_gc.destroy = br_multicast_destroy_mdb_entry; 1302 timer_setup(&mp->timer, br_multicast_group_expired, 0); 1303 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode, 1304 br_mdb_rht_params); 1305 if (err) { 1306 kfree(mp); 1307 mp = ERR_PTR(err); 1308 } else { 1309 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list); 1310 } 1311 1312 return mp; 1313 } 1314 1315 static void br_multicast_group_src_expired(struct timer_list *t) 1316 { 1317 struct net_bridge_group_src *src = from_timer(src, t, timer); 1318 struct net_bridge_port_group *pg; 1319 struct net_bridge *br = src->br; 1320 1321 spin_lock(&br->multicast_lock); 1322 if (hlist_unhashed(&src->node) || !netif_running(br->dev) || 1323 timer_pending(&src->timer)) 1324 goto out; 1325 1326 pg = src->pg; 1327 if (pg->filter_mode == MCAST_INCLUDE) { 1328 br_multicast_del_group_src(src, false); 1329 if (!hlist_empty(&pg->src_list)) 1330 goto out; 1331 br_multicast_find_del_pg(br, pg); 1332 } else { 1333 br_multicast_fwd_src_handle(src); 1334 } 1335 1336 out: 1337 spin_unlock(&br->multicast_lock); 1338 } 1339 1340 struct net_bridge_group_src * 1341 br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip) 1342 { 1343 struct net_bridge_group_src *ent; 1344 1345 switch (ip->proto) { 1346 case htons(ETH_P_IP): 1347 hlist_for_each_entry(ent, &pg->src_list, node) 1348 if (ip->src.ip4 == ent->addr.src.ip4) 1349 return ent; 1350 break; 1351 #if IS_ENABLED(CONFIG_IPV6) 1352 case htons(ETH_P_IPV6): 1353 hlist_for_each_entry(ent, &pg->src_list, node) 1354 if (!ipv6_addr_cmp(&ent->addr.src.ip6, &ip->src.ip6)) 1355 return ent; 1356 break; 1357 #endif 1358 } 1359 1360 return NULL; 1361 } 1362 1363 struct net_bridge_group_src * 1364 br_multicast_new_group_src(struct net_bridge_port_group *pg, struct br_ip *src_ip) 1365 { 1366 struct net_bridge_group_src *grp_src; 1367 1368 if (unlikely(pg->src_ents >= PG_SRC_ENT_LIMIT)) 1369 return NULL; 1370 1371 switch (src_ip->proto) { 1372 case htons(ETH_P_IP): 1373 if (ipv4_is_zeronet(src_ip->src.ip4) || 1374 ipv4_is_multicast(src_ip->src.ip4)) 1375 return NULL; 1376 break; 1377 #if IS_ENABLED(CONFIG_IPV6) 1378 case htons(ETH_P_IPV6): 1379 if (ipv6_addr_any(&src_ip->src.ip6) || 1380 ipv6_addr_is_multicast(&src_ip->src.ip6)) 1381 return NULL; 1382 break; 1383 #endif 1384 } 1385 1386 grp_src = kzalloc(sizeof(*grp_src), GFP_ATOMIC); 1387 if (unlikely(!grp_src)) 1388 return NULL; 1389 1390 grp_src->pg = pg; 1391 grp_src->br = pg->key.port->br; 1392 grp_src->addr = *src_ip; 1393 grp_src->mcast_gc.destroy = br_multicast_destroy_group_src; 1394 timer_setup(&grp_src->timer, br_multicast_group_src_expired, 0); 1395 1396 hlist_add_head_rcu(&grp_src->node, &pg->src_list); 1397 pg->src_ents++; 1398 1399 return grp_src; 1400 } 1401 1402 struct net_bridge_port_group *br_multicast_new_port_group( 1403 struct net_bridge_port *port, 1404 const struct br_ip *group, 1405 struct net_bridge_port_group __rcu *next, 1406 unsigned char flags, 1407 const unsigned char *src, 1408 u8 filter_mode, 1409 u8 rt_protocol, 1410 struct netlink_ext_ack *extack) 1411 { 1412 struct net_bridge_port_group *p; 1413 int err; 1414 1415 err = br_multicast_port_ngroups_inc(port, group, extack); 1416 if (err) 1417 return NULL; 1418 1419 p = kzalloc(sizeof(*p), GFP_ATOMIC); 1420 if (unlikely(!p)) { 1421 NL_SET_ERR_MSG_MOD(extack, "Couldn't allocate new port group"); 1422 goto dec_out; 1423 } 1424 1425 p->key.addr = *group; 1426 p->key.port = port; 1427 p->flags = flags; 1428 p->filter_mode = filter_mode; 1429 p->rt_protocol = rt_protocol; 1430 p->eht_host_tree = RB_ROOT; 1431 p->eht_set_tree = RB_ROOT; 1432 p->mcast_gc.destroy = br_multicast_destroy_port_group; 1433 INIT_HLIST_HEAD(&p->src_list); 1434 1435 if (!br_multicast_is_star_g(group) && 1436 rhashtable_lookup_insert_fast(&port->br->sg_port_tbl, &p->rhnode, 1437 br_sg_port_rht_params)) { 1438 NL_SET_ERR_MSG_MOD(extack, "Couldn't insert new port group"); 1439 goto free_out; 1440 } 1441 1442 rcu_assign_pointer(p->next, next); 1443 timer_setup(&p->timer, br_multicast_port_group_expired, 0); 1444 timer_setup(&p->rexmit_timer, br_multicast_port_group_rexmit, 0); 1445 hlist_add_head(&p->mglist, &port->mglist); 1446 1447 if (src) 1448 memcpy(p->eth_addr, src, ETH_ALEN); 1449 else 1450 eth_broadcast_addr(p->eth_addr); 1451 1452 return p; 1453 1454 free_out: 1455 kfree(p); 1456 dec_out: 1457 br_multicast_port_ngroups_dec(port, group->vid); 1458 return NULL; 1459 } 1460 1461 void br_multicast_del_port_group(struct net_bridge_port_group *p) 1462 { 1463 struct net_bridge_port *port = p->key.port; 1464 __u16 vid = p->key.addr.vid; 1465 1466 hlist_del_init(&p->mglist); 1467 if (!br_multicast_is_star_g(&p->key.addr)) 1468 rhashtable_remove_fast(&port->br->sg_port_tbl, &p->rhnode, 1469 br_sg_port_rht_params); 1470 kfree(p); 1471 br_multicast_port_ngroups_dec(port, vid); 1472 } 1473 1474 void br_multicast_host_join(const struct net_bridge_mcast *brmctx, 1475 struct net_bridge_mdb_entry *mp, bool notify) 1476 { 1477 if (!mp->host_joined) { 1478 mp->host_joined = true; 1479 if (br_multicast_is_star_g(&mp->addr)) 1480 br_multicast_star_g_host_state(mp); 1481 if (notify) 1482 br_mdb_notify(mp->br->dev, mp, NULL, RTM_NEWMDB); 1483 } 1484 1485 if (br_group_is_l2(&mp->addr)) 1486 return; 1487 1488 mod_timer(&mp->timer, jiffies + brmctx->multicast_membership_interval); 1489 } 1490 1491 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify) 1492 { 1493 if (!mp->host_joined) 1494 return; 1495 1496 mp->host_joined = false; 1497 if (br_multicast_is_star_g(&mp->addr)) 1498 br_multicast_star_g_host_state(mp); 1499 if (notify) 1500 br_mdb_notify(mp->br->dev, mp, NULL, RTM_DELMDB); 1501 } 1502 1503 static struct net_bridge_port_group * 1504 __br_multicast_add_group(struct net_bridge_mcast *brmctx, 1505 struct net_bridge_mcast_port *pmctx, 1506 struct br_ip *group, 1507 const unsigned char *src, 1508 u8 filter_mode, 1509 bool igmpv2_mldv1, 1510 bool blocked) 1511 { 1512 struct net_bridge_port_group __rcu **pp; 1513 struct net_bridge_port_group *p = NULL; 1514 struct net_bridge_mdb_entry *mp; 1515 unsigned long now = jiffies; 1516 1517 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 1518 goto out; 1519 1520 mp = br_multicast_new_group(brmctx->br, group); 1521 if (IS_ERR(mp)) 1522 return ERR_CAST(mp); 1523 1524 if (!pmctx) { 1525 br_multicast_host_join(brmctx, mp, true); 1526 goto out; 1527 } 1528 1529 for (pp = &mp->ports; 1530 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 1531 pp = &p->next) { 1532 if (br_port_group_equal(p, pmctx->port, src)) 1533 goto found; 1534 if ((unsigned long)p->key.port < (unsigned long)pmctx->port) 1535 break; 1536 } 1537 1538 p = br_multicast_new_port_group(pmctx->port, group, *pp, 0, src, 1539 filter_mode, RTPROT_KERNEL, NULL); 1540 if (unlikely(!p)) { 1541 p = ERR_PTR(-ENOMEM); 1542 goto out; 1543 } 1544 rcu_assign_pointer(*pp, p); 1545 if (blocked) 1546 p->flags |= MDB_PG_FLAGS_BLOCKED; 1547 br_mdb_notify(brmctx->br->dev, mp, p, RTM_NEWMDB); 1548 1549 found: 1550 if (igmpv2_mldv1) 1551 mod_timer(&p->timer, 1552 now + brmctx->multicast_membership_interval); 1553 1554 out: 1555 return p; 1556 } 1557 1558 static int br_multicast_add_group(struct net_bridge_mcast *brmctx, 1559 struct net_bridge_mcast_port *pmctx, 1560 struct br_ip *group, 1561 const unsigned char *src, 1562 u8 filter_mode, 1563 bool igmpv2_mldv1) 1564 { 1565 struct net_bridge_port_group *pg; 1566 int err; 1567 1568 spin_lock(&brmctx->br->multicast_lock); 1569 pg = __br_multicast_add_group(brmctx, pmctx, group, src, filter_mode, 1570 igmpv2_mldv1, false); 1571 /* NULL is considered valid for host joined groups */ 1572 err = PTR_ERR_OR_ZERO(pg); 1573 spin_unlock(&brmctx->br->multicast_lock); 1574 1575 return err; 1576 } 1577 1578 static int br_ip4_multicast_add_group(struct net_bridge_mcast *brmctx, 1579 struct net_bridge_mcast_port *pmctx, 1580 __be32 group, 1581 __u16 vid, 1582 const unsigned char *src, 1583 bool igmpv2) 1584 { 1585 struct br_ip br_group; 1586 u8 filter_mode; 1587 1588 if (ipv4_is_local_multicast(group)) 1589 return 0; 1590 1591 memset(&br_group, 0, sizeof(br_group)); 1592 br_group.dst.ip4 = group; 1593 br_group.proto = htons(ETH_P_IP); 1594 br_group.vid = vid; 1595 filter_mode = igmpv2 ? MCAST_EXCLUDE : MCAST_INCLUDE; 1596 1597 return br_multicast_add_group(brmctx, pmctx, &br_group, src, 1598 filter_mode, igmpv2); 1599 } 1600 1601 #if IS_ENABLED(CONFIG_IPV6) 1602 static int br_ip6_multicast_add_group(struct net_bridge_mcast *brmctx, 1603 struct net_bridge_mcast_port *pmctx, 1604 const struct in6_addr *group, 1605 __u16 vid, 1606 const unsigned char *src, 1607 bool mldv1) 1608 { 1609 struct br_ip br_group; 1610 u8 filter_mode; 1611 1612 if (ipv6_addr_is_ll_all_nodes(group)) 1613 return 0; 1614 1615 memset(&br_group, 0, sizeof(br_group)); 1616 br_group.dst.ip6 = *group; 1617 br_group.proto = htons(ETH_P_IPV6); 1618 br_group.vid = vid; 1619 filter_mode = mldv1 ? MCAST_EXCLUDE : MCAST_INCLUDE; 1620 1621 return br_multicast_add_group(brmctx, pmctx, &br_group, src, 1622 filter_mode, mldv1); 1623 } 1624 #endif 1625 1626 static bool br_multicast_rport_del(struct hlist_node *rlist) 1627 { 1628 if (hlist_unhashed(rlist)) 1629 return false; 1630 1631 hlist_del_init_rcu(rlist); 1632 return true; 1633 } 1634 1635 static bool br_ip4_multicast_rport_del(struct net_bridge_mcast_port *pmctx) 1636 { 1637 return br_multicast_rport_del(&pmctx->ip4_rlist); 1638 } 1639 1640 static bool br_ip6_multicast_rport_del(struct net_bridge_mcast_port *pmctx) 1641 { 1642 #if IS_ENABLED(CONFIG_IPV6) 1643 return br_multicast_rport_del(&pmctx->ip6_rlist); 1644 #else 1645 return false; 1646 #endif 1647 } 1648 1649 static void br_multicast_router_expired(struct net_bridge_mcast_port *pmctx, 1650 struct timer_list *t, 1651 struct hlist_node *rlist) 1652 { 1653 struct net_bridge *br = pmctx->port->br; 1654 bool del; 1655 1656 spin_lock(&br->multicast_lock); 1657 if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED || 1658 pmctx->multicast_router == MDB_RTR_TYPE_PERM || 1659 timer_pending(t)) 1660 goto out; 1661 1662 del = br_multicast_rport_del(rlist); 1663 br_multicast_rport_del_notify(pmctx, del); 1664 out: 1665 spin_unlock(&br->multicast_lock); 1666 } 1667 1668 static void br_ip4_multicast_router_expired(struct timer_list *t) 1669 { 1670 struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t, 1671 ip4_mc_router_timer); 1672 1673 br_multicast_router_expired(pmctx, t, &pmctx->ip4_rlist); 1674 } 1675 1676 #if IS_ENABLED(CONFIG_IPV6) 1677 static void br_ip6_multicast_router_expired(struct timer_list *t) 1678 { 1679 struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t, 1680 ip6_mc_router_timer); 1681 1682 br_multicast_router_expired(pmctx, t, &pmctx->ip6_rlist); 1683 } 1684 #endif 1685 1686 static void br_mc_router_state_change(struct net_bridge *p, 1687 bool is_mc_router) 1688 { 1689 struct switchdev_attr attr = { 1690 .orig_dev = p->dev, 1691 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER, 1692 .flags = SWITCHDEV_F_DEFER, 1693 .u.mrouter = is_mc_router, 1694 }; 1695 1696 switchdev_port_attr_set(p->dev, &attr, NULL); 1697 } 1698 1699 static void br_multicast_local_router_expired(struct net_bridge_mcast *brmctx, 1700 struct timer_list *timer) 1701 { 1702 spin_lock(&brmctx->br->multicast_lock); 1703 if (brmctx->multicast_router == MDB_RTR_TYPE_DISABLED || 1704 brmctx->multicast_router == MDB_RTR_TYPE_PERM || 1705 br_ip4_multicast_is_router(brmctx) || 1706 br_ip6_multicast_is_router(brmctx)) 1707 goto out; 1708 1709 br_mc_router_state_change(brmctx->br, false); 1710 out: 1711 spin_unlock(&brmctx->br->multicast_lock); 1712 } 1713 1714 static void br_ip4_multicast_local_router_expired(struct timer_list *t) 1715 { 1716 struct net_bridge_mcast *brmctx = from_timer(brmctx, t, 1717 ip4_mc_router_timer); 1718 1719 br_multicast_local_router_expired(brmctx, t); 1720 } 1721 1722 #if IS_ENABLED(CONFIG_IPV6) 1723 static void br_ip6_multicast_local_router_expired(struct timer_list *t) 1724 { 1725 struct net_bridge_mcast *brmctx = from_timer(brmctx, t, 1726 ip6_mc_router_timer); 1727 1728 br_multicast_local_router_expired(brmctx, t); 1729 } 1730 #endif 1731 1732 static void br_multicast_querier_expired(struct net_bridge_mcast *brmctx, 1733 struct bridge_mcast_own_query *query) 1734 { 1735 spin_lock(&brmctx->br->multicast_lock); 1736 if (!netif_running(brmctx->br->dev) || 1737 br_multicast_ctx_vlan_global_disabled(brmctx) || 1738 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) 1739 goto out; 1740 1741 br_multicast_start_querier(brmctx, query); 1742 1743 out: 1744 spin_unlock(&brmctx->br->multicast_lock); 1745 } 1746 1747 static void br_ip4_multicast_querier_expired(struct timer_list *t) 1748 { 1749 struct net_bridge_mcast *brmctx = from_timer(brmctx, t, 1750 ip4_other_query.timer); 1751 1752 br_multicast_querier_expired(brmctx, &brmctx->ip4_own_query); 1753 } 1754 1755 #if IS_ENABLED(CONFIG_IPV6) 1756 static void br_ip6_multicast_querier_expired(struct timer_list *t) 1757 { 1758 struct net_bridge_mcast *brmctx = from_timer(brmctx, t, 1759 ip6_other_query.timer); 1760 1761 br_multicast_querier_expired(brmctx, &brmctx->ip6_own_query); 1762 } 1763 #endif 1764 1765 static void br_multicast_query_delay_expired(struct timer_list *t) 1766 { 1767 } 1768 1769 static void br_multicast_select_own_querier(struct net_bridge_mcast *brmctx, 1770 struct br_ip *ip, 1771 struct sk_buff *skb) 1772 { 1773 if (ip->proto == htons(ETH_P_IP)) 1774 brmctx->ip4_querier.addr.src.ip4 = ip_hdr(skb)->saddr; 1775 #if IS_ENABLED(CONFIG_IPV6) 1776 else 1777 brmctx->ip6_querier.addr.src.ip6 = ipv6_hdr(skb)->saddr; 1778 #endif 1779 } 1780 1781 static void __br_multicast_send_query(struct net_bridge_mcast *brmctx, 1782 struct net_bridge_mcast_port *pmctx, 1783 struct net_bridge_port_group *pg, 1784 struct br_ip *ip_dst, 1785 struct br_ip *group, 1786 bool with_srcs, 1787 u8 sflag, 1788 bool *need_rexmit) 1789 { 1790 bool over_lmqt = !!sflag; 1791 struct sk_buff *skb; 1792 u8 igmp_type; 1793 1794 if (!br_multicast_ctx_should_use(brmctx, pmctx) || 1795 !br_multicast_ctx_matches_vlan_snooping(brmctx)) 1796 return; 1797 1798 again_under_lmqt: 1799 skb = br_multicast_alloc_query(brmctx, pmctx, pg, ip_dst, group, 1800 with_srcs, over_lmqt, sflag, &igmp_type, 1801 need_rexmit); 1802 if (!skb) 1803 return; 1804 1805 if (pmctx) { 1806 skb->dev = pmctx->port->dev; 1807 br_multicast_count(brmctx->br, pmctx->port, skb, igmp_type, 1808 BR_MCAST_DIR_TX); 1809 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, 1810 dev_net(pmctx->port->dev), NULL, skb, NULL, skb->dev, 1811 br_dev_queue_push_xmit); 1812 1813 if (over_lmqt && with_srcs && sflag) { 1814 over_lmqt = false; 1815 goto again_under_lmqt; 1816 } 1817 } else { 1818 br_multicast_select_own_querier(brmctx, group, skb); 1819 br_multicast_count(brmctx->br, NULL, skb, igmp_type, 1820 BR_MCAST_DIR_RX); 1821 netif_rx(skb); 1822 } 1823 } 1824 1825 static void br_multicast_read_querier(const struct bridge_mcast_querier *querier, 1826 struct bridge_mcast_querier *dest) 1827 { 1828 unsigned int seq; 1829 1830 memset(dest, 0, sizeof(*dest)); 1831 do { 1832 seq = read_seqcount_begin(&querier->seq); 1833 dest->port_ifidx = querier->port_ifidx; 1834 memcpy(&dest->addr, &querier->addr, sizeof(struct br_ip)); 1835 } while (read_seqcount_retry(&querier->seq, seq)); 1836 } 1837 1838 static void br_multicast_update_querier(struct net_bridge_mcast *brmctx, 1839 struct bridge_mcast_querier *querier, 1840 int ifindex, 1841 struct br_ip *saddr) 1842 { 1843 write_seqcount_begin(&querier->seq); 1844 querier->port_ifidx = ifindex; 1845 memcpy(&querier->addr, saddr, sizeof(*saddr)); 1846 write_seqcount_end(&querier->seq); 1847 } 1848 1849 static void br_multicast_send_query(struct net_bridge_mcast *brmctx, 1850 struct net_bridge_mcast_port *pmctx, 1851 struct bridge_mcast_own_query *own_query) 1852 { 1853 struct bridge_mcast_other_query *other_query = NULL; 1854 struct bridge_mcast_querier *querier; 1855 struct br_ip br_group; 1856 unsigned long time; 1857 1858 if (!br_multicast_ctx_should_use(brmctx, pmctx) || 1859 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) || 1860 !brmctx->multicast_querier) 1861 return; 1862 1863 memset(&br_group.dst, 0, sizeof(br_group.dst)); 1864 1865 if (pmctx ? (own_query == &pmctx->ip4_own_query) : 1866 (own_query == &brmctx->ip4_own_query)) { 1867 querier = &brmctx->ip4_querier; 1868 other_query = &brmctx->ip4_other_query; 1869 br_group.proto = htons(ETH_P_IP); 1870 #if IS_ENABLED(CONFIG_IPV6) 1871 } else { 1872 querier = &brmctx->ip6_querier; 1873 other_query = &brmctx->ip6_other_query; 1874 br_group.proto = htons(ETH_P_IPV6); 1875 #endif 1876 } 1877 1878 if (!other_query || timer_pending(&other_query->timer)) 1879 return; 1880 1881 /* we're about to select ourselves as querier */ 1882 if (!pmctx && querier->port_ifidx) { 1883 struct br_ip zeroip = {}; 1884 1885 br_multicast_update_querier(brmctx, querier, 0, &zeroip); 1886 } 1887 1888 __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &br_group, false, 1889 0, NULL); 1890 1891 time = jiffies; 1892 time += own_query->startup_sent < brmctx->multicast_startup_query_count ? 1893 brmctx->multicast_startup_query_interval : 1894 brmctx->multicast_query_interval; 1895 mod_timer(&own_query->timer, time); 1896 } 1897 1898 static void 1899 br_multicast_port_query_expired(struct net_bridge_mcast_port *pmctx, 1900 struct bridge_mcast_own_query *query) 1901 { 1902 struct net_bridge *br = pmctx->port->br; 1903 struct net_bridge_mcast *brmctx; 1904 1905 spin_lock(&br->multicast_lock); 1906 if (br_multicast_port_ctx_state_stopped(pmctx)) 1907 goto out; 1908 1909 brmctx = br_multicast_port_ctx_get_global(pmctx); 1910 if (query->startup_sent < brmctx->multicast_startup_query_count) 1911 query->startup_sent++; 1912 1913 br_multicast_send_query(brmctx, pmctx, query); 1914 1915 out: 1916 spin_unlock(&br->multicast_lock); 1917 } 1918 1919 static void br_ip4_multicast_port_query_expired(struct timer_list *t) 1920 { 1921 struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t, 1922 ip4_own_query.timer); 1923 1924 br_multicast_port_query_expired(pmctx, &pmctx->ip4_own_query); 1925 } 1926 1927 #if IS_ENABLED(CONFIG_IPV6) 1928 static void br_ip6_multicast_port_query_expired(struct timer_list *t) 1929 { 1930 struct net_bridge_mcast_port *pmctx = from_timer(pmctx, t, 1931 ip6_own_query.timer); 1932 1933 br_multicast_port_query_expired(pmctx, &pmctx->ip6_own_query); 1934 } 1935 #endif 1936 1937 static void br_multicast_port_group_rexmit(struct timer_list *t) 1938 { 1939 struct net_bridge_port_group *pg = from_timer(pg, t, rexmit_timer); 1940 struct bridge_mcast_other_query *other_query = NULL; 1941 struct net_bridge *br = pg->key.port->br; 1942 struct net_bridge_mcast_port *pmctx; 1943 struct net_bridge_mcast *brmctx; 1944 bool need_rexmit = false; 1945 1946 spin_lock(&br->multicast_lock); 1947 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) || 1948 !br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1949 goto out; 1950 1951 pmctx = br_multicast_pg_to_port_ctx(pg); 1952 if (!pmctx) 1953 goto out; 1954 brmctx = br_multicast_port_ctx_get_global(pmctx); 1955 if (!brmctx->multicast_querier) 1956 goto out; 1957 1958 if (pg->key.addr.proto == htons(ETH_P_IP)) 1959 other_query = &brmctx->ip4_other_query; 1960 #if IS_ENABLED(CONFIG_IPV6) 1961 else 1962 other_query = &brmctx->ip6_other_query; 1963 #endif 1964 1965 if (!other_query || timer_pending(&other_query->timer)) 1966 goto out; 1967 1968 if (pg->grp_query_rexmit_cnt) { 1969 pg->grp_query_rexmit_cnt--; 1970 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 1971 &pg->key.addr, false, 1, NULL); 1972 } 1973 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 1974 &pg->key.addr, true, 0, &need_rexmit); 1975 1976 if (pg->grp_query_rexmit_cnt || need_rexmit) 1977 mod_timer(&pg->rexmit_timer, jiffies + 1978 brmctx->multicast_last_member_interval); 1979 out: 1980 spin_unlock(&br->multicast_lock); 1981 } 1982 1983 static int br_mc_disabled_update(struct net_device *dev, bool value, 1984 struct netlink_ext_ack *extack) 1985 { 1986 struct switchdev_attr attr = { 1987 .orig_dev = dev, 1988 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED, 1989 .flags = SWITCHDEV_F_DEFER, 1990 .u.mc_disabled = !value, 1991 }; 1992 1993 return switchdev_port_attr_set(dev, &attr, extack); 1994 } 1995 1996 void br_multicast_port_ctx_init(struct net_bridge_port *port, 1997 struct net_bridge_vlan *vlan, 1998 struct net_bridge_mcast_port *pmctx) 1999 { 2000 pmctx->port = port; 2001 pmctx->vlan = vlan; 2002 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 2003 timer_setup(&pmctx->ip4_mc_router_timer, 2004 br_ip4_multicast_router_expired, 0); 2005 timer_setup(&pmctx->ip4_own_query.timer, 2006 br_ip4_multicast_port_query_expired, 0); 2007 #if IS_ENABLED(CONFIG_IPV6) 2008 timer_setup(&pmctx->ip6_mc_router_timer, 2009 br_ip6_multicast_router_expired, 0); 2010 timer_setup(&pmctx->ip6_own_query.timer, 2011 br_ip6_multicast_port_query_expired, 0); 2012 #endif 2013 } 2014 2015 void br_multicast_port_ctx_deinit(struct net_bridge_mcast_port *pmctx) 2016 { 2017 #if IS_ENABLED(CONFIG_IPV6) 2018 timer_delete_sync(&pmctx->ip6_mc_router_timer); 2019 #endif 2020 timer_delete_sync(&pmctx->ip4_mc_router_timer); 2021 } 2022 2023 int br_multicast_add_port(struct net_bridge_port *port) 2024 { 2025 int err; 2026 2027 port->multicast_eht_hosts_limit = BR_MCAST_DEFAULT_EHT_HOSTS_LIMIT; 2028 br_multicast_port_ctx_init(port, NULL, &port->multicast_ctx); 2029 2030 err = br_mc_disabled_update(port->dev, 2031 br_opt_get(port->br, 2032 BROPT_MULTICAST_ENABLED), 2033 NULL); 2034 if (err && err != -EOPNOTSUPP) 2035 return err; 2036 2037 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 2038 if (!port->mcast_stats) 2039 return -ENOMEM; 2040 2041 return 0; 2042 } 2043 2044 void br_multicast_del_port(struct net_bridge_port *port) 2045 { 2046 struct net_bridge *br = port->br; 2047 struct net_bridge_port_group *pg; 2048 struct hlist_node *n; 2049 2050 /* Take care of the remaining groups, only perm ones should be left */ 2051 spin_lock_bh(&br->multicast_lock); 2052 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 2053 br_multicast_find_del_pg(br, pg); 2054 spin_unlock_bh(&br->multicast_lock); 2055 flush_work(&br->mcast_gc_work); 2056 br_multicast_port_ctx_deinit(&port->multicast_ctx); 2057 free_percpu(port->mcast_stats); 2058 } 2059 2060 static void br_multicast_enable(struct bridge_mcast_own_query *query) 2061 { 2062 query->startup_sent = 0; 2063 2064 if (timer_delete_sync_try(&query->timer) >= 0 || 2065 timer_delete(&query->timer)) 2066 mod_timer(&query->timer, jiffies); 2067 } 2068 2069 static void __br_multicast_enable_port_ctx(struct net_bridge_mcast_port *pmctx) 2070 { 2071 struct net_bridge *br = pmctx->port->br; 2072 struct net_bridge_mcast *brmctx; 2073 2074 brmctx = br_multicast_port_ctx_get_global(pmctx); 2075 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || 2076 !netif_running(br->dev)) 2077 return; 2078 2079 br_multicast_enable(&pmctx->ip4_own_query); 2080 #if IS_ENABLED(CONFIG_IPV6) 2081 br_multicast_enable(&pmctx->ip6_own_query); 2082 #endif 2083 if (pmctx->multicast_router == MDB_RTR_TYPE_PERM) { 2084 br_ip4_multicast_add_router(brmctx, pmctx); 2085 br_ip6_multicast_add_router(brmctx, pmctx); 2086 } 2087 2088 if (br_multicast_port_ctx_is_vlan(pmctx)) { 2089 struct net_bridge_port_group *pg; 2090 u32 n = 0; 2091 2092 /* The mcast_n_groups counter might be wrong. First, 2093 * BR_VLFLAG_MCAST_ENABLED is toggled before temporary entries 2094 * are flushed, thus mcast_n_groups after the toggle does not 2095 * reflect the true values. And second, permanent entries added 2096 * while BR_VLFLAG_MCAST_ENABLED was disabled, are not reflected 2097 * either. Thus we have to refresh the counter. 2098 */ 2099 2100 hlist_for_each_entry(pg, &pmctx->port->mglist, mglist) { 2101 if (pg->key.addr.vid == pmctx->vlan->vid) 2102 n++; 2103 } 2104 WRITE_ONCE(pmctx->mdb_n_entries, n); 2105 } 2106 } 2107 2108 static void br_multicast_enable_port_ctx(struct net_bridge_mcast_port *pmctx) 2109 { 2110 struct net_bridge *br = pmctx->port->br; 2111 2112 spin_lock_bh(&br->multicast_lock); 2113 if (br_multicast_port_ctx_is_vlan(pmctx) && 2114 !(pmctx->vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) { 2115 spin_unlock_bh(&br->multicast_lock); 2116 return; 2117 } 2118 __br_multicast_enable_port_ctx(pmctx); 2119 spin_unlock_bh(&br->multicast_lock); 2120 } 2121 2122 static void __br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx) 2123 { 2124 struct net_bridge_port_group *pg; 2125 struct hlist_node *n; 2126 bool del = false; 2127 2128 hlist_for_each_entry_safe(pg, n, &pmctx->port->mglist, mglist) 2129 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT) && 2130 (!br_multicast_port_ctx_is_vlan(pmctx) || 2131 pg->key.addr.vid == pmctx->vlan->vid)) 2132 br_multicast_find_del_pg(pmctx->port->br, pg); 2133 2134 del |= br_ip4_multicast_rport_del(pmctx); 2135 timer_delete(&pmctx->ip4_mc_router_timer); 2136 timer_delete(&pmctx->ip4_own_query.timer); 2137 del |= br_ip6_multicast_rport_del(pmctx); 2138 #if IS_ENABLED(CONFIG_IPV6) 2139 timer_delete(&pmctx->ip6_mc_router_timer); 2140 timer_delete(&pmctx->ip6_own_query.timer); 2141 #endif 2142 br_multicast_rport_del_notify(pmctx, del); 2143 } 2144 2145 static void br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx) 2146 { 2147 struct net_bridge *br = pmctx->port->br; 2148 2149 spin_lock_bh(&br->multicast_lock); 2150 if (br_multicast_port_ctx_is_vlan(pmctx) && 2151 !(pmctx->vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) { 2152 spin_unlock_bh(&br->multicast_lock); 2153 return; 2154 } 2155 2156 __br_multicast_disable_port_ctx(pmctx); 2157 spin_unlock_bh(&br->multicast_lock); 2158 } 2159 2160 static void br_multicast_toggle_port(struct net_bridge_port *port, bool on) 2161 { 2162 #if IS_ENABLED(CONFIG_BRIDGE_VLAN_FILTERING) 2163 if (br_opt_get(port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { 2164 struct net_bridge_vlan_group *vg; 2165 struct net_bridge_vlan *vlan; 2166 2167 rcu_read_lock(); 2168 vg = nbp_vlan_group_rcu(port); 2169 if (!vg) { 2170 rcu_read_unlock(); 2171 return; 2172 } 2173 2174 /* iterate each vlan, toggle vlan multicast context */ 2175 list_for_each_entry_rcu(vlan, &vg->vlan_list, vlist) { 2176 struct net_bridge_mcast_port *pmctx = 2177 &vlan->port_mcast_ctx; 2178 u8 state = br_vlan_get_state(vlan); 2179 /* enable vlan multicast context when state is 2180 * LEARNING or FORWARDING 2181 */ 2182 if (on && br_vlan_state_allowed(state, true)) 2183 br_multicast_enable_port_ctx(pmctx); 2184 else 2185 br_multicast_disable_port_ctx(pmctx); 2186 } 2187 rcu_read_unlock(); 2188 return; 2189 } 2190 #endif 2191 /* toggle port multicast context when vlan snooping is disabled */ 2192 if (on) 2193 br_multicast_enable_port_ctx(&port->multicast_ctx); 2194 else 2195 br_multicast_disable_port_ctx(&port->multicast_ctx); 2196 } 2197 2198 void br_multicast_enable_port(struct net_bridge_port *port) 2199 { 2200 br_multicast_toggle_port(port, true); 2201 } 2202 2203 void br_multicast_disable_port(struct net_bridge_port *port) 2204 { 2205 br_multicast_toggle_port(port, false); 2206 } 2207 2208 static int __grp_src_delete_marked(struct net_bridge_port_group *pg) 2209 { 2210 struct net_bridge_group_src *ent; 2211 struct hlist_node *tmp; 2212 int deleted = 0; 2213 2214 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) 2215 if (ent->flags & BR_SGRP_F_DELETE) { 2216 br_multicast_del_group_src(ent, false); 2217 deleted++; 2218 } 2219 2220 return deleted; 2221 } 2222 2223 static void __grp_src_mod_timer(struct net_bridge_group_src *src, 2224 unsigned long expires) 2225 { 2226 mod_timer(&src->timer, expires); 2227 br_multicast_fwd_src_handle(src); 2228 } 2229 2230 static void __grp_src_query_marked_and_rexmit(struct net_bridge_mcast *brmctx, 2231 struct net_bridge_mcast_port *pmctx, 2232 struct net_bridge_port_group *pg) 2233 { 2234 struct bridge_mcast_other_query *other_query = NULL; 2235 u32 lmqc = brmctx->multicast_last_member_count; 2236 unsigned long lmqt, lmi, now = jiffies; 2237 struct net_bridge_group_src *ent; 2238 2239 if (!netif_running(brmctx->br->dev) || 2240 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) 2241 return; 2242 2243 if (pg->key.addr.proto == htons(ETH_P_IP)) 2244 other_query = &brmctx->ip4_other_query; 2245 #if IS_ENABLED(CONFIG_IPV6) 2246 else 2247 other_query = &brmctx->ip6_other_query; 2248 #endif 2249 2250 lmqt = now + br_multicast_lmqt(brmctx); 2251 hlist_for_each_entry(ent, &pg->src_list, node) { 2252 if (ent->flags & BR_SGRP_F_SEND) { 2253 ent->flags &= ~BR_SGRP_F_SEND; 2254 if (ent->timer.expires > lmqt) { 2255 if (brmctx->multicast_querier && 2256 other_query && 2257 !timer_pending(&other_query->timer)) 2258 ent->src_query_rexmit_cnt = lmqc; 2259 __grp_src_mod_timer(ent, lmqt); 2260 } 2261 } 2262 } 2263 2264 if (!brmctx->multicast_querier || 2265 !other_query || timer_pending(&other_query->timer)) 2266 return; 2267 2268 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 2269 &pg->key.addr, true, 1, NULL); 2270 2271 lmi = now + brmctx->multicast_last_member_interval; 2272 if (!timer_pending(&pg->rexmit_timer) || 2273 time_after(pg->rexmit_timer.expires, lmi)) 2274 mod_timer(&pg->rexmit_timer, lmi); 2275 } 2276 2277 static void __grp_send_query_and_rexmit(struct net_bridge_mcast *brmctx, 2278 struct net_bridge_mcast_port *pmctx, 2279 struct net_bridge_port_group *pg) 2280 { 2281 struct bridge_mcast_other_query *other_query = NULL; 2282 unsigned long now = jiffies, lmi; 2283 2284 if (!netif_running(brmctx->br->dev) || 2285 !br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) 2286 return; 2287 2288 if (pg->key.addr.proto == htons(ETH_P_IP)) 2289 other_query = &brmctx->ip4_other_query; 2290 #if IS_ENABLED(CONFIG_IPV6) 2291 else 2292 other_query = &brmctx->ip6_other_query; 2293 #endif 2294 2295 if (brmctx->multicast_querier && 2296 other_query && !timer_pending(&other_query->timer)) { 2297 lmi = now + brmctx->multicast_last_member_interval; 2298 pg->grp_query_rexmit_cnt = brmctx->multicast_last_member_count - 1; 2299 __br_multicast_send_query(brmctx, pmctx, pg, &pg->key.addr, 2300 &pg->key.addr, false, 0, NULL); 2301 if (!timer_pending(&pg->rexmit_timer) || 2302 time_after(pg->rexmit_timer.expires, lmi)) 2303 mod_timer(&pg->rexmit_timer, lmi); 2304 } 2305 2306 if (pg->filter_mode == MCAST_EXCLUDE && 2307 (!timer_pending(&pg->timer) || 2308 time_after(pg->timer.expires, now + br_multicast_lmqt(brmctx)))) 2309 mod_timer(&pg->timer, now + br_multicast_lmqt(brmctx)); 2310 } 2311 2312 /* State Msg type New state Actions 2313 * INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI 2314 * INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI 2315 * EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI 2316 */ 2317 static bool br_multicast_isinc_allow(const struct net_bridge_mcast *brmctx, 2318 struct net_bridge_port_group *pg, void *h_addr, 2319 void *srcs, u32 nsrcs, size_t addr_size, 2320 int grec_type) 2321 { 2322 struct net_bridge_group_src *ent; 2323 unsigned long now = jiffies; 2324 bool changed = false; 2325 struct br_ip src_ip; 2326 u32 src_idx; 2327 2328 memset(&src_ip, 0, sizeof(src_ip)); 2329 src_ip.proto = pg->key.addr.proto; 2330 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2331 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2332 ent = br_multicast_find_group_src(pg, &src_ip); 2333 if (!ent) { 2334 ent = br_multicast_new_group_src(pg, &src_ip); 2335 if (ent) 2336 changed = true; 2337 } 2338 2339 if (ent) 2340 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx)); 2341 } 2342 2343 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2344 grec_type)) 2345 changed = true; 2346 2347 return changed; 2348 } 2349 2350 /* State Msg type New state Actions 2351 * INCLUDE (A) IS_EX (B) EXCLUDE (A*B,B-A) (B-A)=0 2352 * Delete (A-B) 2353 * Group Timer=GMI 2354 */ 2355 static void __grp_src_isexc_incl(const struct net_bridge_mcast *brmctx, 2356 struct net_bridge_port_group *pg, void *h_addr, 2357 void *srcs, u32 nsrcs, size_t addr_size, 2358 int grec_type) 2359 { 2360 struct net_bridge_group_src *ent; 2361 struct br_ip src_ip; 2362 u32 src_idx; 2363 2364 hlist_for_each_entry(ent, &pg->src_list, node) 2365 ent->flags |= BR_SGRP_F_DELETE; 2366 2367 memset(&src_ip, 0, sizeof(src_ip)); 2368 src_ip.proto = pg->key.addr.proto; 2369 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2370 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2371 ent = br_multicast_find_group_src(pg, &src_ip); 2372 if (ent) 2373 ent->flags &= ~BR_SGRP_F_DELETE; 2374 else 2375 ent = br_multicast_new_group_src(pg, &src_ip); 2376 if (ent) 2377 br_multicast_fwd_src_handle(ent); 2378 } 2379 2380 br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2381 grec_type); 2382 2383 __grp_src_delete_marked(pg); 2384 } 2385 2386 /* State Msg type New state Actions 2387 * EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=GMI 2388 * Delete (X-A) 2389 * Delete (Y-A) 2390 * Group Timer=GMI 2391 */ 2392 static bool __grp_src_isexc_excl(const struct net_bridge_mcast *brmctx, 2393 struct net_bridge_port_group *pg, void *h_addr, 2394 void *srcs, u32 nsrcs, size_t addr_size, 2395 int grec_type) 2396 { 2397 struct net_bridge_group_src *ent; 2398 unsigned long now = jiffies; 2399 bool changed = false; 2400 struct br_ip src_ip; 2401 u32 src_idx; 2402 2403 hlist_for_each_entry(ent, &pg->src_list, node) 2404 ent->flags |= BR_SGRP_F_DELETE; 2405 2406 memset(&src_ip, 0, sizeof(src_ip)); 2407 src_ip.proto = pg->key.addr.proto; 2408 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2409 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2410 ent = br_multicast_find_group_src(pg, &src_ip); 2411 if (ent) { 2412 ent->flags &= ~BR_SGRP_F_DELETE; 2413 } else { 2414 ent = br_multicast_new_group_src(pg, &src_ip); 2415 if (ent) { 2416 __grp_src_mod_timer(ent, 2417 now + br_multicast_gmi(brmctx)); 2418 changed = true; 2419 } 2420 } 2421 } 2422 2423 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2424 grec_type)) 2425 changed = true; 2426 2427 if (__grp_src_delete_marked(pg)) 2428 changed = true; 2429 2430 return changed; 2431 } 2432 2433 static bool br_multicast_isexc(const struct net_bridge_mcast *brmctx, 2434 struct net_bridge_port_group *pg, void *h_addr, 2435 void *srcs, u32 nsrcs, size_t addr_size, 2436 int grec_type) 2437 { 2438 bool changed = false; 2439 2440 switch (pg->filter_mode) { 2441 case MCAST_INCLUDE: 2442 __grp_src_isexc_incl(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2443 grec_type); 2444 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE); 2445 changed = true; 2446 break; 2447 case MCAST_EXCLUDE: 2448 changed = __grp_src_isexc_excl(brmctx, pg, h_addr, srcs, nsrcs, 2449 addr_size, grec_type); 2450 break; 2451 } 2452 2453 pg->filter_mode = MCAST_EXCLUDE; 2454 mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx)); 2455 2456 return changed; 2457 } 2458 2459 /* State Msg type New state Actions 2460 * INCLUDE (A) TO_IN (B) INCLUDE (A+B) (B)=GMI 2461 * Send Q(G,A-B) 2462 */ 2463 static bool __grp_src_toin_incl(struct net_bridge_mcast *brmctx, 2464 struct net_bridge_mcast_port *pmctx, 2465 struct net_bridge_port_group *pg, void *h_addr, 2466 void *srcs, u32 nsrcs, size_t addr_size, 2467 int grec_type) 2468 { 2469 u32 src_idx, to_send = pg->src_ents; 2470 struct net_bridge_group_src *ent; 2471 unsigned long now = jiffies; 2472 bool changed = false; 2473 struct br_ip src_ip; 2474 2475 hlist_for_each_entry(ent, &pg->src_list, node) 2476 ent->flags |= BR_SGRP_F_SEND; 2477 2478 memset(&src_ip, 0, sizeof(src_ip)); 2479 src_ip.proto = pg->key.addr.proto; 2480 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2481 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2482 ent = br_multicast_find_group_src(pg, &src_ip); 2483 if (ent) { 2484 ent->flags &= ~BR_SGRP_F_SEND; 2485 to_send--; 2486 } else { 2487 ent = br_multicast_new_group_src(pg, &src_ip); 2488 if (ent) 2489 changed = true; 2490 } 2491 if (ent) 2492 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx)); 2493 } 2494 2495 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2496 grec_type)) 2497 changed = true; 2498 2499 if (to_send) 2500 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2501 2502 return changed; 2503 } 2504 2505 /* State Msg type New state Actions 2506 * EXCLUDE (X,Y) TO_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI 2507 * Send Q(G,X-A) 2508 * Send Q(G) 2509 */ 2510 static bool __grp_src_toin_excl(struct net_bridge_mcast *brmctx, 2511 struct net_bridge_mcast_port *pmctx, 2512 struct net_bridge_port_group *pg, void *h_addr, 2513 void *srcs, u32 nsrcs, size_t addr_size, 2514 int grec_type) 2515 { 2516 u32 src_idx, to_send = pg->src_ents; 2517 struct net_bridge_group_src *ent; 2518 unsigned long now = jiffies; 2519 bool changed = false; 2520 struct br_ip src_ip; 2521 2522 hlist_for_each_entry(ent, &pg->src_list, node) 2523 if (timer_pending(&ent->timer)) 2524 ent->flags |= BR_SGRP_F_SEND; 2525 2526 memset(&src_ip, 0, sizeof(src_ip)); 2527 src_ip.proto = pg->key.addr.proto; 2528 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2529 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2530 ent = br_multicast_find_group_src(pg, &src_ip); 2531 if (ent) { 2532 if (timer_pending(&ent->timer)) { 2533 ent->flags &= ~BR_SGRP_F_SEND; 2534 to_send--; 2535 } 2536 } else { 2537 ent = br_multicast_new_group_src(pg, &src_ip); 2538 if (ent) 2539 changed = true; 2540 } 2541 if (ent) 2542 __grp_src_mod_timer(ent, now + br_multicast_gmi(brmctx)); 2543 } 2544 2545 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2546 grec_type)) 2547 changed = true; 2548 2549 if (to_send) 2550 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2551 2552 __grp_send_query_and_rexmit(brmctx, pmctx, pg); 2553 2554 return changed; 2555 } 2556 2557 static bool br_multicast_toin(struct net_bridge_mcast *brmctx, 2558 struct net_bridge_mcast_port *pmctx, 2559 struct net_bridge_port_group *pg, void *h_addr, 2560 void *srcs, u32 nsrcs, size_t addr_size, 2561 int grec_type) 2562 { 2563 bool changed = false; 2564 2565 switch (pg->filter_mode) { 2566 case MCAST_INCLUDE: 2567 changed = __grp_src_toin_incl(brmctx, pmctx, pg, h_addr, srcs, 2568 nsrcs, addr_size, grec_type); 2569 break; 2570 case MCAST_EXCLUDE: 2571 changed = __grp_src_toin_excl(brmctx, pmctx, pg, h_addr, srcs, 2572 nsrcs, addr_size, grec_type); 2573 break; 2574 } 2575 2576 if (br_multicast_eht_should_del_pg(pg)) { 2577 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE; 2578 br_multicast_find_del_pg(pg->key.port->br, pg); 2579 /* a notification has already been sent and we shouldn't 2580 * access pg after the delete so we have to return false 2581 */ 2582 changed = false; 2583 } 2584 2585 return changed; 2586 } 2587 2588 /* State Msg type New state Actions 2589 * INCLUDE (A) TO_EX (B) EXCLUDE (A*B,B-A) (B-A)=0 2590 * Delete (A-B) 2591 * Send Q(G,A*B) 2592 * Group Timer=GMI 2593 */ 2594 static void __grp_src_toex_incl(struct net_bridge_mcast *brmctx, 2595 struct net_bridge_mcast_port *pmctx, 2596 struct net_bridge_port_group *pg, void *h_addr, 2597 void *srcs, u32 nsrcs, size_t addr_size, 2598 int grec_type) 2599 { 2600 struct net_bridge_group_src *ent; 2601 u32 src_idx, to_send = 0; 2602 struct br_ip src_ip; 2603 2604 hlist_for_each_entry(ent, &pg->src_list, node) 2605 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE; 2606 2607 memset(&src_ip, 0, sizeof(src_ip)); 2608 src_ip.proto = pg->key.addr.proto; 2609 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2610 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2611 ent = br_multicast_find_group_src(pg, &src_ip); 2612 if (ent) { 2613 ent->flags = (ent->flags & ~BR_SGRP_F_DELETE) | 2614 BR_SGRP_F_SEND; 2615 to_send++; 2616 } else { 2617 ent = br_multicast_new_group_src(pg, &src_ip); 2618 } 2619 if (ent) 2620 br_multicast_fwd_src_handle(ent); 2621 } 2622 2623 br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2624 grec_type); 2625 2626 __grp_src_delete_marked(pg); 2627 if (to_send) 2628 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2629 } 2630 2631 /* State Msg type New state Actions 2632 * EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=Group Timer 2633 * Delete (X-A) 2634 * Delete (Y-A) 2635 * Send Q(G,A-Y) 2636 * Group Timer=GMI 2637 */ 2638 static bool __grp_src_toex_excl(struct net_bridge_mcast *brmctx, 2639 struct net_bridge_mcast_port *pmctx, 2640 struct net_bridge_port_group *pg, void *h_addr, 2641 void *srcs, u32 nsrcs, size_t addr_size, 2642 int grec_type) 2643 { 2644 struct net_bridge_group_src *ent; 2645 u32 src_idx, to_send = 0; 2646 bool changed = false; 2647 struct br_ip src_ip; 2648 2649 hlist_for_each_entry(ent, &pg->src_list, node) 2650 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE; 2651 2652 memset(&src_ip, 0, sizeof(src_ip)); 2653 src_ip.proto = pg->key.addr.proto; 2654 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2655 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2656 ent = br_multicast_find_group_src(pg, &src_ip); 2657 if (ent) { 2658 ent->flags &= ~BR_SGRP_F_DELETE; 2659 } else { 2660 ent = br_multicast_new_group_src(pg, &src_ip); 2661 if (ent) { 2662 __grp_src_mod_timer(ent, pg->timer.expires); 2663 changed = true; 2664 } 2665 } 2666 if (ent && timer_pending(&ent->timer)) { 2667 ent->flags |= BR_SGRP_F_SEND; 2668 to_send++; 2669 } 2670 } 2671 2672 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2673 grec_type)) 2674 changed = true; 2675 2676 if (__grp_src_delete_marked(pg)) 2677 changed = true; 2678 if (to_send) 2679 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2680 2681 return changed; 2682 } 2683 2684 static bool br_multicast_toex(struct net_bridge_mcast *brmctx, 2685 struct net_bridge_mcast_port *pmctx, 2686 struct net_bridge_port_group *pg, void *h_addr, 2687 void *srcs, u32 nsrcs, size_t addr_size, 2688 int grec_type) 2689 { 2690 bool changed = false; 2691 2692 switch (pg->filter_mode) { 2693 case MCAST_INCLUDE: 2694 __grp_src_toex_incl(brmctx, pmctx, pg, h_addr, srcs, nsrcs, 2695 addr_size, grec_type); 2696 br_multicast_star_g_handle_mode(pg, MCAST_EXCLUDE); 2697 changed = true; 2698 break; 2699 case MCAST_EXCLUDE: 2700 changed = __grp_src_toex_excl(brmctx, pmctx, pg, h_addr, srcs, 2701 nsrcs, addr_size, grec_type); 2702 break; 2703 } 2704 2705 pg->filter_mode = MCAST_EXCLUDE; 2706 mod_timer(&pg->timer, jiffies + br_multicast_gmi(brmctx)); 2707 2708 return changed; 2709 } 2710 2711 /* State Msg type New state Actions 2712 * INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B) 2713 */ 2714 static bool __grp_src_block_incl(struct net_bridge_mcast *brmctx, 2715 struct net_bridge_mcast_port *pmctx, 2716 struct net_bridge_port_group *pg, void *h_addr, 2717 void *srcs, u32 nsrcs, size_t addr_size, int grec_type) 2718 { 2719 struct net_bridge_group_src *ent; 2720 u32 src_idx, to_send = 0; 2721 bool changed = false; 2722 struct br_ip src_ip; 2723 2724 hlist_for_each_entry(ent, &pg->src_list, node) 2725 ent->flags &= ~BR_SGRP_F_SEND; 2726 2727 memset(&src_ip, 0, sizeof(src_ip)); 2728 src_ip.proto = pg->key.addr.proto; 2729 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2730 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2731 ent = br_multicast_find_group_src(pg, &src_ip); 2732 if (ent) { 2733 ent->flags |= BR_SGRP_F_SEND; 2734 to_send++; 2735 } 2736 } 2737 2738 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2739 grec_type)) 2740 changed = true; 2741 2742 if (to_send) 2743 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2744 2745 return changed; 2746 } 2747 2748 /* State Msg type New state Actions 2749 * EXCLUDE (X,Y) BLOCK (A) EXCLUDE (X+(A-Y),Y) (A-X-Y)=Group Timer 2750 * Send Q(G,A-Y) 2751 */ 2752 static bool __grp_src_block_excl(struct net_bridge_mcast *brmctx, 2753 struct net_bridge_mcast_port *pmctx, 2754 struct net_bridge_port_group *pg, void *h_addr, 2755 void *srcs, u32 nsrcs, size_t addr_size, int grec_type) 2756 { 2757 struct net_bridge_group_src *ent; 2758 u32 src_idx, to_send = 0; 2759 bool changed = false; 2760 struct br_ip src_ip; 2761 2762 hlist_for_each_entry(ent, &pg->src_list, node) 2763 ent->flags &= ~BR_SGRP_F_SEND; 2764 2765 memset(&src_ip, 0, sizeof(src_ip)); 2766 src_ip.proto = pg->key.addr.proto; 2767 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 2768 memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size); 2769 ent = br_multicast_find_group_src(pg, &src_ip); 2770 if (!ent) { 2771 ent = br_multicast_new_group_src(pg, &src_ip); 2772 if (ent) { 2773 __grp_src_mod_timer(ent, pg->timer.expires); 2774 changed = true; 2775 } 2776 } 2777 if (ent && timer_pending(&ent->timer)) { 2778 ent->flags |= BR_SGRP_F_SEND; 2779 to_send++; 2780 } 2781 } 2782 2783 if (br_multicast_eht_handle(brmctx, pg, h_addr, srcs, nsrcs, addr_size, 2784 grec_type)) 2785 changed = true; 2786 2787 if (to_send) 2788 __grp_src_query_marked_and_rexmit(brmctx, pmctx, pg); 2789 2790 return changed; 2791 } 2792 2793 static bool br_multicast_block(struct net_bridge_mcast *brmctx, 2794 struct net_bridge_mcast_port *pmctx, 2795 struct net_bridge_port_group *pg, void *h_addr, 2796 void *srcs, u32 nsrcs, size_t addr_size, int grec_type) 2797 { 2798 bool changed = false; 2799 2800 switch (pg->filter_mode) { 2801 case MCAST_INCLUDE: 2802 changed = __grp_src_block_incl(brmctx, pmctx, pg, h_addr, srcs, 2803 nsrcs, addr_size, grec_type); 2804 break; 2805 case MCAST_EXCLUDE: 2806 changed = __grp_src_block_excl(brmctx, pmctx, pg, h_addr, srcs, 2807 nsrcs, addr_size, grec_type); 2808 break; 2809 } 2810 2811 if ((pg->filter_mode == MCAST_INCLUDE && hlist_empty(&pg->src_list)) || 2812 br_multicast_eht_should_del_pg(pg)) { 2813 if (br_multicast_eht_should_del_pg(pg)) 2814 pg->flags |= MDB_PG_FLAGS_FAST_LEAVE; 2815 br_multicast_find_del_pg(pg->key.port->br, pg); 2816 /* a notification has already been sent and we shouldn't 2817 * access pg after the delete so we have to return false 2818 */ 2819 changed = false; 2820 } 2821 2822 return changed; 2823 } 2824 2825 static struct net_bridge_port_group * 2826 br_multicast_find_port(struct net_bridge_mdb_entry *mp, 2827 struct net_bridge_port *p, 2828 const unsigned char *src) 2829 { 2830 struct net_bridge *br __maybe_unused = mp->br; 2831 struct net_bridge_port_group *pg; 2832 2833 for (pg = mlock_dereference(mp->ports, br); 2834 pg; 2835 pg = mlock_dereference(pg->next, br)) 2836 if (br_port_group_equal(pg, p, src)) 2837 return pg; 2838 2839 return NULL; 2840 } 2841 2842 static int br_ip4_multicast_igmp3_report(struct net_bridge_mcast *brmctx, 2843 struct net_bridge_mcast_port *pmctx, 2844 struct sk_buff *skb, 2845 u16 vid) 2846 { 2847 bool igmpv2 = brmctx->multicast_igmp_version == 2; 2848 struct net_bridge_mdb_entry *mdst; 2849 struct net_bridge_port_group *pg; 2850 const unsigned char *src; 2851 struct igmpv3_report *ih; 2852 struct igmpv3_grec *grec; 2853 int i, len, num, type; 2854 __be32 group, *h_addr; 2855 bool changed = false; 2856 int err = 0; 2857 u16 nsrcs; 2858 2859 ih = igmpv3_report_hdr(skb); 2860 num = ntohs(ih->ngrec); 2861 len = skb_transport_offset(skb) + sizeof(*ih); 2862 2863 for (i = 0; i < num; i++) { 2864 len += sizeof(*grec); 2865 if (!ip_mc_may_pull(skb, len)) 2866 return -EINVAL; 2867 2868 grec = (void *)(skb->data + len - sizeof(*grec)); 2869 group = grec->grec_mca; 2870 type = grec->grec_type; 2871 nsrcs = ntohs(grec->grec_nsrcs); 2872 2873 len += nsrcs * 4; 2874 if (!ip_mc_may_pull(skb, len)) 2875 return -EINVAL; 2876 2877 switch (type) { 2878 case IGMPV3_MODE_IS_INCLUDE: 2879 case IGMPV3_MODE_IS_EXCLUDE: 2880 case IGMPV3_CHANGE_TO_INCLUDE: 2881 case IGMPV3_CHANGE_TO_EXCLUDE: 2882 case IGMPV3_ALLOW_NEW_SOURCES: 2883 case IGMPV3_BLOCK_OLD_SOURCES: 2884 break; 2885 2886 default: 2887 continue; 2888 } 2889 2890 src = eth_hdr(skb)->h_source; 2891 if (nsrcs == 0 && 2892 (type == IGMPV3_CHANGE_TO_INCLUDE || 2893 type == IGMPV3_MODE_IS_INCLUDE)) { 2894 if (!pmctx || igmpv2) { 2895 br_ip4_multicast_leave_group(brmctx, pmctx, 2896 group, vid, src); 2897 continue; 2898 } 2899 } else { 2900 err = br_ip4_multicast_add_group(brmctx, pmctx, group, 2901 vid, src, igmpv2); 2902 if (err) 2903 break; 2904 } 2905 2906 if (!pmctx || igmpv2) 2907 continue; 2908 2909 spin_lock(&brmctx->br->multicast_lock); 2910 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 2911 goto unlock_continue; 2912 2913 mdst = br_mdb_ip4_get(brmctx->br, group, vid); 2914 if (!mdst) 2915 goto unlock_continue; 2916 pg = br_multicast_find_port(mdst, pmctx->port, src); 2917 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT)) 2918 goto unlock_continue; 2919 /* reload grec and host addr */ 2920 grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4)); 2921 h_addr = &ip_hdr(skb)->saddr; 2922 switch (type) { 2923 case IGMPV3_ALLOW_NEW_SOURCES: 2924 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 2925 grec->grec_src, 2926 nsrcs, sizeof(__be32), type); 2927 break; 2928 case IGMPV3_MODE_IS_INCLUDE: 2929 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 2930 grec->grec_src, 2931 nsrcs, sizeof(__be32), type); 2932 break; 2933 case IGMPV3_MODE_IS_EXCLUDE: 2934 changed = br_multicast_isexc(brmctx, pg, h_addr, 2935 grec->grec_src, 2936 nsrcs, sizeof(__be32), type); 2937 break; 2938 case IGMPV3_CHANGE_TO_INCLUDE: 2939 changed = br_multicast_toin(brmctx, pmctx, pg, h_addr, 2940 grec->grec_src, 2941 nsrcs, sizeof(__be32), type); 2942 break; 2943 case IGMPV3_CHANGE_TO_EXCLUDE: 2944 changed = br_multicast_toex(brmctx, pmctx, pg, h_addr, 2945 grec->grec_src, 2946 nsrcs, sizeof(__be32), type); 2947 break; 2948 case IGMPV3_BLOCK_OLD_SOURCES: 2949 changed = br_multicast_block(brmctx, pmctx, pg, h_addr, 2950 grec->grec_src, 2951 nsrcs, sizeof(__be32), type); 2952 break; 2953 } 2954 if (changed) 2955 br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB); 2956 unlock_continue: 2957 spin_unlock(&brmctx->br->multicast_lock); 2958 } 2959 2960 return err; 2961 } 2962 2963 #if IS_ENABLED(CONFIG_IPV6) 2964 static int br_ip6_multicast_mld2_report(struct net_bridge_mcast *brmctx, 2965 struct net_bridge_mcast_port *pmctx, 2966 struct sk_buff *skb, 2967 u16 vid) 2968 { 2969 bool mldv1 = brmctx->multicast_mld_version == 1; 2970 struct net_bridge_mdb_entry *mdst; 2971 struct net_bridge_port_group *pg; 2972 unsigned int nsrcs_offset; 2973 struct mld2_report *mld2r; 2974 const unsigned char *src; 2975 struct in6_addr *h_addr; 2976 struct mld2_grec *grec; 2977 unsigned int grec_len; 2978 bool changed = false; 2979 int i, len, num; 2980 int err = 0; 2981 2982 if (!ipv6_mc_may_pull(skb, sizeof(*mld2r))) 2983 return -EINVAL; 2984 2985 mld2r = (struct mld2_report *)icmp6_hdr(skb); 2986 num = ntohs(mld2r->mld2r_ngrec); 2987 len = skb_transport_offset(skb) + sizeof(*mld2r); 2988 2989 for (i = 0; i < num; i++) { 2990 __be16 *_nsrcs, __nsrcs; 2991 u16 nsrcs; 2992 2993 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs); 2994 2995 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < 2996 nsrcs_offset + sizeof(__nsrcs)) 2997 return -EINVAL; 2998 2999 _nsrcs = skb_header_pointer(skb, nsrcs_offset, 3000 sizeof(__nsrcs), &__nsrcs); 3001 if (!_nsrcs) 3002 return -EINVAL; 3003 3004 nsrcs = ntohs(*_nsrcs); 3005 grec_len = struct_size(grec, grec_src, nsrcs); 3006 3007 if (!ipv6_mc_may_pull(skb, len + grec_len)) 3008 return -EINVAL; 3009 3010 grec = (struct mld2_grec *)(skb->data + len); 3011 len += grec_len; 3012 3013 switch (grec->grec_type) { 3014 case MLD2_MODE_IS_INCLUDE: 3015 case MLD2_MODE_IS_EXCLUDE: 3016 case MLD2_CHANGE_TO_INCLUDE: 3017 case MLD2_CHANGE_TO_EXCLUDE: 3018 case MLD2_ALLOW_NEW_SOURCES: 3019 case MLD2_BLOCK_OLD_SOURCES: 3020 break; 3021 3022 default: 3023 continue; 3024 } 3025 3026 src = eth_hdr(skb)->h_source; 3027 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE || 3028 grec->grec_type == MLD2_MODE_IS_INCLUDE) && 3029 nsrcs == 0) { 3030 if (!pmctx || mldv1) { 3031 br_ip6_multicast_leave_group(brmctx, pmctx, 3032 &grec->grec_mca, 3033 vid, src); 3034 continue; 3035 } 3036 } else { 3037 err = br_ip6_multicast_add_group(brmctx, pmctx, 3038 &grec->grec_mca, vid, 3039 src, mldv1); 3040 if (err) 3041 break; 3042 } 3043 3044 if (!pmctx || mldv1) 3045 continue; 3046 3047 spin_lock(&brmctx->br->multicast_lock); 3048 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3049 goto unlock_continue; 3050 3051 mdst = br_mdb_ip6_get(brmctx->br, &grec->grec_mca, vid); 3052 if (!mdst) 3053 goto unlock_continue; 3054 pg = br_multicast_find_port(mdst, pmctx->port, src); 3055 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT)) 3056 goto unlock_continue; 3057 h_addr = &ipv6_hdr(skb)->saddr; 3058 switch (grec->grec_type) { 3059 case MLD2_ALLOW_NEW_SOURCES: 3060 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 3061 grec->grec_src, nsrcs, 3062 sizeof(struct in6_addr), 3063 grec->grec_type); 3064 break; 3065 case MLD2_MODE_IS_INCLUDE: 3066 changed = br_multicast_isinc_allow(brmctx, pg, h_addr, 3067 grec->grec_src, nsrcs, 3068 sizeof(struct in6_addr), 3069 grec->grec_type); 3070 break; 3071 case MLD2_MODE_IS_EXCLUDE: 3072 changed = br_multicast_isexc(brmctx, pg, h_addr, 3073 grec->grec_src, nsrcs, 3074 sizeof(struct in6_addr), 3075 grec->grec_type); 3076 break; 3077 case MLD2_CHANGE_TO_INCLUDE: 3078 changed = br_multicast_toin(brmctx, pmctx, pg, h_addr, 3079 grec->grec_src, nsrcs, 3080 sizeof(struct in6_addr), 3081 grec->grec_type); 3082 break; 3083 case MLD2_CHANGE_TO_EXCLUDE: 3084 changed = br_multicast_toex(brmctx, pmctx, pg, h_addr, 3085 grec->grec_src, nsrcs, 3086 sizeof(struct in6_addr), 3087 grec->grec_type); 3088 break; 3089 case MLD2_BLOCK_OLD_SOURCES: 3090 changed = br_multicast_block(brmctx, pmctx, pg, h_addr, 3091 grec->grec_src, nsrcs, 3092 sizeof(struct in6_addr), 3093 grec->grec_type); 3094 break; 3095 } 3096 if (changed) 3097 br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB); 3098 unlock_continue: 3099 spin_unlock(&brmctx->br->multicast_lock); 3100 } 3101 3102 return err; 3103 } 3104 #endif 3105 3106 static bool br_multicast_select_querier(struct net_bridge_mcast *brmctx, 3107 struct net_bridge_mcast_port *pmctx, 3108 struct br_ip *saddr) 3109 { 3110 int port_ifidx = pmctx ? pmctx->port->dev->ifindex : 0; 3111 struct timer_list *own_timer, *other_timer; 3112 struct bridge_mcast_querier *querier; 3113 3114 switch (saddr->proto) { 3115 case htons(ETH_P_IP): 3116 querier = &brmctx->ip4_querier; 3117 own_timer = &brmctx->ip4_own_query.timer; 3118 other_timer = &brmctx->ip4_other_query.timer; 3119 if (!querier->addr.src.ip4 || 3120 ntohl(saddr->src.ip4) <= ntohl(querier->addr.src.ip4)) 3121 goto update; 3122 break; 3123 #if IS_ENABLED(CONFIG_IPV6) 3124 case htons(ETH_P_IPV6): 3125 querier = &brmctx->ip6_querier; 3126 own_timer = &brmctx->ip6_own_query.timer; 3127 other_timer = &brmctx->ip6_other_query.timer; 3128 if (ipv6_addr_cmp(&saddr->src.ip6, &querier->addr.src.ip6) <= 0) 3129 goto update; 3130 break; 3131 #endif 3132 default: 3133 return false; 3134 } 3135 3136 if (!timer_pending(own_timer) && !timer_pending(other_timer)) 3137 goto update; 3138 3139 return false; 3140 3141 update: 3142 br_multicast_update_querier(brmctx, querier, port_ifidx, saddr); 3143 3144 return true; 3145 } 3146 3147 static struct net_bridge_port * 3148 __br_multicast_get_querier_port(struct net_bridge *br, 3149 const struct bridge_mcast_querier *querier) 3150 { 3151 int port_ifidx = READ_ONCE(querier->port_ifidx); 3152 struct net_bridge_port *p; 3153 struct net_device *dev; 3154 3155 if (port_ifidx == 0) 3156 return NULL; 3157 3158 dev = dev_get_by_index_rcu(dev_net(br->dev), port_ifidx); 3159 if (!dev) 3160 return NULL; 3161 p = br_port_get_rtnl_rcu(dev); 3162 if (!p || p->br != br) 3163 return NULL; 3164 3165 return p; 3166 } 3167 3168 size_t br_multicast_querier_state_size(void) 3169 { 3170 return nla_total_size(0) + /* nest attribute */ 3171 nla_total_size(sizeof(__be32)) + /* BRIDGE_QUERIER_IP_ADDRESS */ 3172 nla_total_size(sizeof(int)) + /* BRIDGE_QUERIER_IP_PORT */ 3173 nla_total_size_64bit(sizeof(u64)) + /* BRIDGE_QUERIER_IP_OTHER_TIMER */ 3174 #if IS_ENABLED(CONFIG_IPV6) 3175 nla_total_size(sizeof(struct in6_addr)) + /* BRIDGE_QUERIER_IPV6_ADDRESS */ 3176 nla_total_size(sizeof(int)) + /* BRIDGE_QUERIER_IPV6_PORT */ 3177 nla_total_size_64bit(sizeof(u64)) + /* BRIDGE_QUERIER_IPV6_OTHER_TIMER */ 3178 #endif 3179 0; 3180 } 3181 3182 /* protected by rtnl or rcu */ 3183 int br_multicast_dump_querier_state(struct sk_buff *skb, 3184 const struct net_bridge_mcast *brmctx, 3185 int nest_attr) 3186 { 3187 struct bridge_mcast_querier querier = {}; 3188 struct net_bridge_port *p; 3189 struct nlattr *nest; 3190 3191 if (!br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED) || 3192 br_multicast_ctx_vlan_global_disabled(brmctx)) 3193 return 0; 3194 3195 nest = nla_nest_start(skb, nest_attr); 3196 if (!nest) 3197 return -EMSGSIZE; 3198 3199 rcu_read_lock(); 3200 if (!brmctx->multicast_querier && 3201 !timer_pending(&brmctx->ip4_other_query.timer)) 3202 goto out_v6; 3203 3204 br_multicast_read_querier(&brmctx->ip4_querier, &querier); 3205 if (nla_put_in_addr(skb, BRIDGE_QUERIER_IP_ADDRESS, 3206 querier.addr.src.ip4)) { 3207 rcu_read_unlock(); 3208 goto out_err; 3209 } 3210 3211 p = __br_multicast_get_querier_port(brmctx->br, &querier); 3212 if (timer_pending(&brmctx->ip4_other_query.timer) && 3213 (nla_put_u64_64bit(skb, BRIDGE_QUERIER_IP_OTHER_TIMER, 3214 br_timer_value(&brmctx->ip4_other_query.timer), 3215 BRIDGE_QUERIER_PAD) || 3216 (p && nla_put_u32(skb, BRIDGE_QUERIER_IP_PORT, p->dev->ifindex)))) { 3217 rcu_read_unlock(); 3218 goto out_err; 3219 } 3220 3221 out_v6: 3222 #if IS_ENABLED(CONFIG_IPV6) 3223 if (!brmctx->multicast_querier && 3224 !timer_pending(&brmctx->ip6_other_query.timer)) 3225 goto out; 3226 3227 br_multicast_read_querier(&brmctx->ip6_querier, &querier); 3228 if (nla_put_in6_addr(skb, BRIDGE_QUERIER_IPV6_ADDRESS, 3229 &querier.addr.src.ip6)) { 3230 rcu_read_unlock(); 3231 goto out_err; 3232 } 3233 3234 p = __br_multicast_get_querier_port(brmctx->br, &querier); 3235 if (timer_pending(&brmctx->ip6_other_query.timer) && 3236 (nla_put_u64_64bit(skb, BRIDGE_QUERIER_IPV6_OTHER_TIMER, 3237 br_timer_value(&brmctx->ip6_other_query.timer), 3238 BRIDGE_QUERIER_PAD) || 3239 (p && nla_put_u32(skb, BRIDGE_QUERIER_IPV6_PORT, 3240 p->dev->ifindex)))) { 3241 rcu_read_unlock(); 3242 goto out_err; 3243 } 3244 out: 3245 #endif 3246 rcu_read_unlock(); 3247 nla_nest_end(skb, nest); 3248 if (!nla_len(nest)) 3249 nla_nest_cancel(skb, nest); 3250 3251 return 0; 3252 3253 out_err: 3254 nla_nest_cancel(skb, nest); 3255 return -EMSGSIZE; 3256 } 3257 3258 static void 3259 br_multicast_update_query_timer(struct net_bridge_mcast *brmctx, 3260 struct bridge_mcast_other_query *query, 3261 unsigned long max_delay) 3262 { 3263 if (!timer_pending(&query->timer)) 3264 mod_timer(&query->delay_timer, jiffies + max_delay); 3265 3266 mod_timer(&query->timer, jiffies + brmctx->multicast_querier_interval); 3267 } 3268 3269 static void br_port_mc_router_state_change(struct net_bridge_port *p, 3270 bool is_mc_router) 3271 { 3272 struct switchdev_attr attr = { 3273 .orig_dev = p->dev, 3274 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER, 3275 .flags = SWITCHDEV_F_DEFER, 3276 .u.mrouter = is_mc_router, 3277 }; 3278 3279 switchdev_port_attr_set(p->dev, &attr, NULL); 3280 } 3281 3282 static struct net_bridge_port * 3283 br_multicast_rport_from_node(struct net_bridge_mcast *brmctx, 3284 struct hlist_head *mc_router_list, 3285 struct hlist_node *rlist) 3286 { 3287 struct net_bridge_mcast_port *pmctx; 3288 3289 #if IS_ENABLED(CONFIG_IPV6) 3290 if (mc_router_list == &brmctx->ip6_mc_router_list) 3291 pmctx = hlist_entry(rlist, struct net_bridge_mcast_port, 3292 ip6_rlist); 3293 else 3294 #endif 3295 pmctx = hlist_entry(rlist, struct net_bridge_mcast_port, 3296 ip4_rlist); 3297 3298 return pmctx->port; 3299 } 3300 3301 static struct hlist_node * 3302 br_multicast_get_rport_slot(struct net_bridge_mcast *brmctx, 3303 struct net_bridge_port *port, 3304 struct hlist_head *mc_router_list) 3305 3306 { 3307 struct hlist_node *slot = NULL; 3308 struct net_bridge_port *p; 3309 struct hlist_node *rlist; 3310 3311 hlist_for_each(rlist, mc_router_list) { 3312 p = br_multicast_rport_from_node(brmctx, mc_router_list, rlist); 3313 3314 if ((unsigned long)port >= (unsigned long)p) 3315 break; 3316 3317 slot = rlist; 3318 } 3319 3320 return slot; 3321 } 3322 3323 static bool br_multicast_no_router_otherpf(struct net_bridge_mcast_port *pmctx, 3324 struct hlist_node *rnode) 3325 { 3326 #if IS_ENABLED(CONFIG_IPV6) 3327 if (rnode != &pmctx->ip6_rlist) 3328 return hlist_unhashed(&pmctx->ip6_rlist); 3329 else 3330 return hlist_unhashed(&pmctx->ip4_rlist); 3331 #else 3332 return true; 3333 #endif 3334 } 3335 3336 /* Add port to router_list 3337 * list is maintained ordered by pointer value 3338 * and locked by br->multicast_lock and RCU 3339 */ 3340 static void br_multicast_add_router(struct net_bridge_mcast *brmctx, 3341 struct net_bridge_mcast_port *pmctx, 3342 struct hlist_node *rlist, 3343 struct hlist_head *mc_router_list) 3344 { 3345 struct hlist_node *slot; 3346 3347 if (!hlist_unhashed(rlist)) 3348 return; 3349 3350 slot = br_multicast_get_rport_slot(brmctx, pmctx->port, mc_router_list); 3351 3352 if (slot) 3353 hlist_add_behind_rcu(rlist, slot); 3354 else 3355 hlist_add_head_rcu(rlist, mc_router_list); 3356 3357 /* For backwards compatibility for now, only notify if we 3358 * switched from no IPv4/IPv6 multicast router to a new 3359 * IPv4 or IPv6 multicast router. 3360 */ 3361 if (br_multicast_no_router_otherpf(pmctx, rlist)) { 3362 br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_NEWMDB); 3363 br_port_mc_router_state_change(pmctx->port, true); 3364 } 3365 } 3366 3367 /* Add port to router_list 3368 * list is maintained ordered by pointer value 3369 * and locked by br->multicast_lock and RCU 3370 */ 3371 static void br_ip4_multicast_add_router(struct net_bridge_mcast *brmctx, 3372 struct net_bridge_mcast_port *pmctx) 3373 { 3374 br_multicast_add_router(brmctx, pmctx, &pmctx->ip4_rlist, 3375 &brmctx->ip4_mc_router_list); 3376 } 3377 3378 /* Add port to router_list 3379 * list is maintained ordered by pointer value 3380 * and locked by br->multicast_lock and RCU 3381 */ 3382 static void br_ip6_multicast_add_router(struct net_bridge_mcast *brmctx, 3383 struct net_bridge_mcast_port *pmctx) 3384 { 3385 #if IS_ENABLED(CONFIG_IPV6) 3386 br_multicast_add_router(brmctx, pmctx, &pmctx->ip6_rlist, 3387 &brmctx->ip6_mc_router_list); 3388 #endif 3389 } 3390 3391 static void br_multicast_mark_router(struct net_bridge_mcast *brmctx, 3392 struct net_bridge_mcast_port *pmctx, 3393 struct timer_list *timer, 3394 struct hlist_node *rlist, 3395 struct hlist_head *mc_router_list) 3396 { 3397 unsigned long now = jiffies; 3398 3399 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3400 return; 3401 3402 if (!pmctx) { 3403 if (brmctx->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) { 3404 if (!br_ip4_multicast_is_router(brmctx) && 3405 !br_ip6_multicast_is_router(brmctx)) 3406 br_mc_router_state_change(brmctx->br, true); 3407 mod_timer(timer, now + brmctx->multicast_querier_interval); 3408 } 3409 return; 3410 } 3411 3412 if (pmctx->multicast_router == MDB_RTR_TYPE_DISABLED || 3413 pmctx->multicast_router == MDB_RTR_TYPE_PERM) 3414 return; 3415 3416 br_multicast_add_router(brmctx, pmctx, rlist, mc_router_list); 3417 mod_timer(timer, now + brmctx->multicast_querier_interval); 3418 } 3419 3420 static void br_ip4_multicast_mark_router(struct net_bridge_mcast *brmctx, 3421 struct net_bridge_mcast_port *pmctx) 3422 { 3423 struct timer_list *timer = &brmctx->ip4_mc_router_timer; 3424 struct hlist_node *rlist = NULL; 3425 3426 if (pmctx) { 3427 timer = &pmctx->ip4_mc_router_timer; 3428 rlist = &pmctx->ip4_rlist; 3429 } 3430 3431 br_multicast_mark_router(brmctx, pmctx, timer, rlist, 3432 &brmctx->ip4_mc_router_list); 3433 } 3434 3435 static void br_ip6_multicast_mark_router(struct net_bridge_mcast *brmctx, 3436 struct net_bridge_mcast_port *pmctx) 3437 { 3438 #if IS_ENABLED(CONFIG_IPV6) 3439 struct timer_list *timer = &brmctx->ip6_mc_router_timer; 3440 struct hlist_node *rlist = NULL; 3441 3442 if (pmctx) { 3443 timer = &pmctx->ip6_mc_router_timer; 3444 rlist = &pmctx->ip6_rlist; 3445 } 3446 3447 br_multicast_mark_router(brmctx, pmctx, timer, rlist, 3448 &brmctx->ip6_mc_router_list); 3449 #endif 3450 } 3451 3452 static void 3453 br_ip4_multicast_query_received(struct net_bridge_mcast *brmctx, 3454 struct net_bridge_mcast_port *pmctx, 3455 struct bridge_mcast_other_query *query, 3456 struct br_ip *saddr, 3457 unsigned long max_delay) 3458 { 3459 if (!br_multicast_select_querier(brmctx, pmctx, saddr)) 3460 return; 3461 3462 br_multicast_update_query_timer(brmctx, query, max_delay); 3463 br_ip4_multicast_mark_router(brmctx, pmctx); 3464 } 3465 3466 #if IS_ENABLED(CONFIG_IPV6) 3467 static void 3468 br_ip6_multicast_query_received(struct net_bridge_mcast *brmctx, 3469 struct net_bridge_mcast_port *pmctx, 3470 struct bridge_mcast_other_query *query, 3471 struct br_ip *saddr, 3472 unsigned long max_delay) 3473 { 3474 if (!br_multicast_select_querier(brmctx, pmctx, saddr)) 3475 return; 3476 3477 br_multicast_update_query_timer(brmctx, query, max_delay); 3478 br_ip6_multicast_mark_router(brmctx, pmctx); 3479 } 3480 #endif 3481 3482 static void br_ip4_multicast_query(struct net_bridge_mcast *brmctx, 3483 struct net_bridge_mcast_port *pmctx, 3484 struct sk_buff *skb, 3485 u16 vid) 3486 { 3487 unsigned int transport_len = ip_transport_len(skb); 3488 const struct iphdr *iph = ip_hdr(skb); 3489 struct igmphdr *ih = igmp_hdr(skb); 3490 struct net_bridge_mdb_entry *mp; 3491 struct igmpv3_query *ih3; 3492 struct net_bridge_port_group *p; 3493 struct net_bridge_port_group __rcu **pp; 3494 struct br_ip saddr = {}; 3495 unsigned long max_delay; 3496 unsigned long now = jiffies; 3497 __be32 group; 3498 3499 spin_lock(&brmctx->br->multicast_lock); 3500 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3501 goto out; 3502 3503 group = ih->group; 3504 3505 if (transport_len == sizeof(*ih)) { 3506 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 3507 3508 if (!max_delay) { 3509 max_delay = 10 * HZ; 3510 group = 0; 3511 } 3512 } else if (transport_len >= sizeof(*ih3)) { 3513 ih3 = igmpv3_query_hdr(skb); 3514 if (ih3->nsrcs || 3515 (brmctx->multicast_igmp_version == 3 && group && 3516 ih3->suppress)) 3517 goto out; 3518 3519 max_delay = ih3->code ? 3520 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 3521 } else { 3522 goto out; 3523 } 3524 3525 if (!group) { 3526 saddr.proto = htons(ETH_P_IP); 3527 saddr.src.ip4 = iph->saddr; 3528 3529 br_ip4_multicast_query_received(brmctx, pmctx, 3530 &brmctx->ip4_other_query, 3531 &saddr, max_delay); 3532 goto out; 3533 } 3534 3535 mp = br_mdb_ip4_get(brmctx->br, group, vid); 3536 if (!mp) 3537 goto out; 3538 3539 max_delay *= brmctx->multicast_last_member_count; 3540 3541 if (mp->host_joined && 3542 (timer_pending(&mp->timer) ? 3543 time_after(mp->timer.expires, now + max_delay) : 3544 timer_delete_sync_try(&mp->timer) >= 0)) 3545 mod_timer(&mp->timer, now + max_delay); 3546 3547 for (pp = &mp->ports; 3548 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 3549 pp = &p->next) { 3550 if (timer_pending(&p->timer) ? 3551 time_after(p->timer.expires, now + max_delay) : 3552 timer_delete_sync_try(&p->timer) >= 0 && 3553 (brmctx->multicast_igmp_version == 2 || 3554 p->filter_mode == MCAST_EXCLUDE)) 3555 mod_timer(&p->timer, now + max_delay); 3556 } 3557 3558 out: 3559 spin_unlock(&brmctx->br->multicast_lock); 3560 } 3561 3562 #if IS_ENABLED(CONFIG_IPV6) 3563 static int br_ip6_multicast_query(struct net_bridge_mcast *brmctx, 3564 struct net_bridge_mcast_port *pmctx, 3565 struct sk_buff *skb, 3566 u16 vid) 3567 { 3568 unsigned int transport_len = ipv6_transport_len(skb); 3569 struct mld_msg *mld; 3570 struct net_bridge_mdb_entry *mp; 3571 struct mld2_query *mld2q; 3572 struct net_bridge_port_group *p; 3573 struct net_bridge_port_group __rcu **pp; 3574 struct br_ip saddr = {}; 3575 unsigned long max_delay; 3576 unsigned long now = jiffies; 3577 unsigned int offset = skb_transport_offset(skb); 3578 const struct in6_addr *group = NULL; 3579 bool is_general_query; 3580 int err = 0; 3581 3582 spin_lock(&brmctx->br->multicast_lock); 3583 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3584 goto out; 3585 3586 if (transport_len == sizeof(*mld)) { 3587 if (!pskb_may_pull(skb, offset + sizeof(*mld))) { 3588 err = -EINVAL; 3589 goto out; 3590 } 3591 mld = (struct mld_msg *) icmp6_hdr(skb); 3592 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); 3593 if (max_delay) 3594 group = &mld->mld_mca; 3595 } else { 3596 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) { 3597 err = -EINVAL; 3598 goto out; 3599 } 3600 mld2q = (struct mld2_query *)icmp6_hdr(skb); 3601 if (!mld2q->mld2q_nsrcs) 3602 group = &mld2q->mld2q_mca; 3603 if (brmctx->multicast_mld_version == 2 && 3604 !ipv6_addr_any(&mld2q->mld2q_mca) && 3605 mld2q->mld2q_suppress) 3606 goto out; 3607 3608 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); 3609 } 3610 3611 is_general_query = group && ipv6_addr_any(group); 3612 3613 if (is_general_query) { 3614 saddr.proto = htons(ETH_P_IPV6); 3615 saddr.src.ip6 = ipv6_hdr(skb)->saddr; 3616 3617 br_ip6_multicast_query_received(brmctx, pmctx, 3618 &brmctx->ip6_other_query, 3619 &saddr, max_delay); 3620 goto out; 3621 } else if (!group) { 3622 goto out; 3623 } 3624 3625 mp = br_mdb_ip6_get(brmctx->br, group, vid); 3626 if (!mp) 3627 goto out; 3628 3629 max_delay *= brmctx->multicast_last_member_count; 3630 if (mp->host_joined && 3631 (timer_pending(&mp->timer) ? 3632 time_after(mp->timer.expires, now + max_delay) : 3633 timer_delete_sync_try(&mp->timer) >= 0)) 3634 mod_timer(&mp->timer, now + max_delay); 3635 3636 for (pp = &mp->ports; 3637 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 3638 pp = &p->next) { 3639 if (timer_pending(&p->timer) ? 3640 time_after(p->timer.expires, now + max_delay) : 3641 timer_delete_sync_try(&p->timer) >= 0 && 3642 (brmctx->multicast_mld_version == 1 || 3643 p->filter_mode == MCAST_EXCLUDE)) 3644 mod_timer(&p->timer, now + max_delay); 3645 } 3646 3647 out: 3648 spin_unlock(&brmctx->br->multicast_lock); 3649 return err; 3650 } 3651 #endif 3652 3653 static void 3654 br_multicast_leave_group(struct net_bridge_mcast *brmctx, 3655 struct net_bridge_mcast_port *pmctx, 3656 struct br_ip *group, 3657 struct bridge_mcast_other_query *other_query, 3658 struct bridge_mcast_own_query *own_query, 3659 const unsigned char *src) 3660 { 3661 struct net_bridge_mdb_entry *mp; 3662 struct net_bridge_port_group *p; 3663 unsigned long now; 3664 unsigned long time; 3665 3666 spin_lock(&brmctx->br->multicast_lock); 3667 if (!br_multicast_ctx_should_use(brmctx, pmctx)) 3668 goto out; 3669 3670 mp = br_mdb_ip_get(brmctx->br, group); 3671 if (!mp) 3672 goto out; 3673 3674 if (pmctx && (pmctx->port->flags & BR_MULTICAST_FAST_LEAVE)) { 3675 struct net_bridge_port_group __rcu **pp; 3676 3677 for (pp = &mp->ports; 3678 (p = mlock_dereference(*pp, brmctx->br)) != NULL; 3679 pp = &p->next) { 3680 if (!br_port_group_equal(p, pmctx->port, src)) 3681 continue; 3682 3683 if (p->flags & MDB_PG_FLAGS_PERMANENT) 3684 break; 3685 3686 p->flags |= MDB_PG_FLAGS_FAST_LEAVE; 3687 br_multicast_del_pg(mp, p, pp); 3688 } 3689 goto out; 3690 } 3691 3692 if (timer_pending(&other_query->timer)) 3693 goto out; 3694 3695 if (brmctx->multicast_querier) { 3696 __br_multicast_send_query(brmctx, pmctx, NULL, NULL, &mp->addr, 3697 false, 0, NULL); 3698 3699 time = jiffies + brmctx->multicast_last_member_count * 3700 brmctx->multicast_last_member_interval; 3701 3702 mod_timer(&own_query->timer, time); 3703 3704 for (p = mlock_dereference(mp->ports, brmctx->br); 3705 p != NULL && pmctx != NULL; 3706 p = mlock_dereference(p->next, brmctx->br)) { 3707 if (!br_port_group_equal(p, pmctx->port, src)) 3708 continue; 3709 3710 if (!hlist_unhashed(&p->mglist) && 3711 (timer_pending(&p->timer) ? 3712 time_after(p->timer.expires, time) : 3713 timer_delete_sync_try(&p->timer) >= 0)) { 3714 mod_timer(&p->timer, time); 3715 } 3716 3717 break; 3718 } 3719 } 3720 3721 now = jiffies; 3722 time = now + brmctx->multicast_last_member_count * 3723 brmctx->multicast_last_member_interval; 3724 3725 if (!pmctx) { 3726 if (mp->host_joined && 3727 (timer_pending(&mp->timer) ? 3728 time_after(mp->timer.expires, time) : 3729 timer_delete_sync_try(&mp->timer) >= 0)) { 3730 mod_timer(&mp->timer, time); 3731 } 3732 3733 goto out; 3734 } 3735 3736 for (p = mlock_dereference(mp->ports, brmctx->br); 3737 p != NULL; 3738 p = mlock_dereference(p->next, brmctx->br)) { 3739 if (p->key.port != pmctx->port) 3740 continue; 3741 3742 if (!hlist_unhashed(&p->mglist) && 3743 (timer_pending(&p->timer) ? 3744 time_after(p->timer.expires, time) : 3745 timer_delete_sync_try(&p->timer) >= 0)) { 3746 mod_timer(&p->timer, time); 3747 } 3748 3749 break; 3750 } 3751 out: 3752 spin_unlock(&brmctx->br->multicast_lock); 3753 } 3754 3755 static void br_ip4_multicast_leave_group(struct net_bridge_mcast *brmctx, 3756 struct net_bridge_mcast_port *pmctx, 3757 __be32 group, 3758 __u16 vid, 3759 const unsigned char *src) 3760 { 3761 struct br_ip br_group; 3762 struct bridge_mcast_own_query *own_query; 3763 3764 if (ipv4_is_local_multicast(group)) 3765 return; 3766 3767 own_query = pmctx ? &pmctx->ip4_own_query : &brmctx->ip4_own_query; 3768 3769 memset(&br_group, 0, sizeof(br_group)); 3770 br_group.dst.ip4 = group; 3771 br_group.proto = htons(ETH_P_IP); 3772 br_group.vid = vid; 3773 3774 br_multicast_leave_group(brmctx, pmctx, &br_group, 3775 &brmctx->ip4_other_query, 3776 own_query, src); 3777 } 3778 3779 #if IS_ENABLED(CONFIG_IPV6) 3780 static void br_ip6_multicast_leave_group(struct net_bridge_mcast *brmctx, 3781 struct net_bridge_mcast_port *pmctx, 3782 const struct in6_addr *group, 3783 __u16 vid, 3784 const unsigned char *src) 3785 { 3786 struct br_ip br_group; 3787 struct bridge_mcast_own_query *own_query; 3788 3789 if (ipv6_addr_is_ll_all_nodes(group)) 3790 return; 3791 3792 own_query = pmctx ? &pmctx->ip6_own_query : &brmctx->ip6_own_query; 3793 3794 memset(&br_group, 0, sizeof(br_group)); 3795 br_group.dst.ip6 = *group; 3796 br_group.proto = htons(ETH_P_IPV6); 3797 br_group.vid = vid; 3798 3799 br_multicast_leave_group(brmctx, pmctx, &br_group, 3800 &brmctx->ip6_other_query, 3801 own_query, src); 3802 } 3803 #endif 3804 3805 static void br_multicast_err_count(const struct net_bridge *br, 3806 const struct net_bridge_port *p, 3807 __be16 proto) 3808 { 3809 struct bridge_mcast_stats __percpu *stats; 3810 struct bridge_mcast_stats *pstats; 3811 3812 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 3813 return; 3814 3815 if (p) 3816 stats = p->mcast_stats; 3817 else 3818 stats = br->mcast_stats; 3819 if (WARN_ON(!stats)) 3820 return; 3821 3822 pstats = this_cpu_ptr(stats); 3823 3824 u64_stats_update_begin(&pstats->syncp); 3825 switch (proto) { 3826 case htons(ETH_P_IP): 3827 pstats->mstats.igmp_parse_errors++; 3828 break; 3829 #if IS_ENABLED(CONFIG_IPV6) 3830 case htons(ETH_P_IPV6): 3831 pstats->mstats.mld_parse_errors++; 3832 break; 3833 #endif 3834 } 3835 u64_stats_update_end(&pstats->syncp); 3836 } 3837 3838 static void br_multicast_pim(struct net_bridge_mcast *brmctx, 3839 struct net_bridge_mcast_port *pmctx, 3840 const struct sk_buff *skb) 3841 { 3842 unsigned int offset = skb_transport_offset(skb); 3843 struct pimhdr *pimhdr, _pimhdr; 3844 3845 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr); 3846 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION || 3847 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO) 3848 return; 3849 3850 spin_lock(&brmctx->br->multicast_lock); 3851 br_ip4_multicast_mark_router(brmctx, pmctx); 3852 spin_unlock(&brmctx->br->multicast_lock); 3853 } 3854 3855 static int br_ip4_multicast_mrd_rcv(struct net_bridge_mcast *brmctx, 3856 struct net_bridge_mcast_port *pmctx, 3857 struct sk_buff *skb) 3858 { 3859 if (ip_hdr(skb)->protocol != IPPROTO_IGMP || 3860 igmp_hdr(skb)->type != IGMP_MRDISC_ADV) 3861 return -ENOMSG; 3862 3863 spin_lock(&brmctx->br->multicast_lock); 3864 br_ip4_multicast_mark_router(brmctx, pmctx); 3865 spin_unlock(&brmctx->br->multicast_lock); 3866 3867 return 0; 3868 } 3869 3870 static int br_multicast_ipv4_rcv(struct net_bridge_mcast *brmctx, 3871 struct net_bridge_mcast_port *pmctx, 3872 struct sk_buff *skb, 3873 u16 vid) 3874 { 3875 struct net_bridge_port *p = pmctx ? pmctx->port : NULL; 3876 const unsigned char *src; 3877 struct igmphdr *ih; 3878 int err; 3879 3880 err = ip_mc_check_igmp(skb); 3881 3882 if (err == -ENOMSG) { 3883 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) { 3884 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 3885 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) { 3886 if (ip_hdr(skb)->protocol == IPPROTO_PIM) 3887 br_multicast_pim(brmctx, pmctx, skb); 3888 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) { 3889 br_ip4_multicast_mrd_rcv(brmctx, pmctx, skb); 3890 } 3891 3892 return 0; 3893 } else if (err < 0) { 3894 br_multicast_err_count(brmctx->br, p, skb->protocol); 3895 return err; 3896 } 3897 3898 ih = igmp_hdr(skb); 3899 src = eth_hdr(skb)->h_source; 3900 BR_INPUT_SKB_CB(skb)->igmp = ih->type; 3901 3902 switch (ih->type) { 3903 case IGMP_HOST_MEMBERSHIP_REPORT: 3904 case IGMPV2_HOST_MEMBERSHIP_REPORT: 3905 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 3906 err = br_ip4_multicast_add_group(brmctx, pmctx, ih->group, vid, 3907 src, true); 3908 break; 3909 case IGMPV3_HOST_MEMBERSHIP_REPORT: 3910 err = br_ip4_multicast_igmp3_report(brmctx, pmctx, skb, vid); 3911 break; 3912 case IGMP_HOST_MEMBERSHIP_QUERY: 3913 br_ip4_multicast_query(brmctx, pmctx, skb, vid); 3914 break; 3915 case IGMP_HOST_LEAVE_MESSAGE: 3916 br_ip4_multicast_leave_group(brmctx, pmctx, ih->group, vid, src); 3917 break; 3918 } 3919 3920 br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp, 3921 BR_MCAST_DIR_RX); 3922 3923 return err; 3924 } 3925 3926 #if IS_ENABLED(CONFIG_IPV6) 3927 static void br_ip6_multicast_mrd_rcv(struct net_bridge_mcast *brmctx, 3928 struct net_bridge_mcast_port *pmctx, 3929 struct sk_buff *skb) 3930 { 3931 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV) 3932 return; 3933 3934 spin_lock(&brmctx->br->multicast_lock); 3935 br_ip6_multicast_mark_router(brmctx, pmctx); 3936 spin_unlock(&brmctx->br->multicast_lock); 3937 } 3938 3939 static int br_multicast_ipv6_rcv(struct net_bridge_mcast *brmctx, 3940 struct net_bridge_mcast_port *pmctx, 3941 struct sk_buff *skb, 3942 u16 vid) 3943 { 3944 struct net_bridge_port *p = pmctx ? pmctx->port : NULL; 3945 const unsigned char *src; 3946 struct mld_msg *mld; 3947 int err; 3948 3949 err = ipv6_mc_check_mld(skb); 3950 3951 if (err == -ENOMSG || err == -ENODATA) { 3952 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr)) 3953 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 3954 if (err == -ENODATA && 3955 ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) 3956 br_ip6_multicast_mrd_rcv(brmctx, pmctx, skb); 3957 3958 return 0; 3959 } else if (err < 0) { 3960 br_multicast_err_count(brmctx->br, p, skb->protocol); 3961 return err; 3962 } 3963 3964 mld = (struct mld_msg *)skb_transport_header(skb); 3965 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type; 3966 3967 switch (mld->mld_type) { 3968 case ICMPV6_MGM_REPORT: 3969 src = eth_hdr(skb)->h_source; 3970 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 3971 err = br_ip6_multicast_add_group(brmctx, pmctx, &mld->mld_mca, 3972 vid, src, true); 3973 break; 3974 case ICMPV6_MLD2_REPORT: 3975 err = br_ip6_multicast_mld2_report(brmctx, pmctx, skb, vid); 3976 break; 3977 case ICMPV6_MGM_QUERY: 3978 err = br_ip6_multicast_query(brmctx, pmctx, skb, vid); 3979 break; 3980 case ICMPV6_MGM_REDUCTION: 3981 src = eth_hdr(skb)->h_source; 3982 br_ip6_multicast_leave_group(brmctx, pmctx, &mld->mld_mca, vid, 3983 src); 3984 break; 3985 } 3986 3987 br_multicast_count(brmctx->br, p, skb, BR_INPUT_SKB_CB(skb)->igmp, 3988 BR_MCAST_DIR_RX); 3989 3990 return err; 3991 } 3992 #endif 3993 3994 int br_multicast_rcv(struct net_bridge_mcast **brmctx, 3995 struct net_bridge_mcast_port **pmctx, 3996 struct net_bridge_vlan *vlan, 3997 struct sk_buff *skb, u16 vid) 3998 { 3999 int ret = 0; 4000 4001 BR_INPUT_SKB_CB(skb)->igmp = 0; 4002 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 4003 4004 if (!br_opt_get((*brmctx)->br, BROPT_MULTICAST_ENABLED)) 4005 return 0; 4006 4007 if (br_opt_get((*brmctx)->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) && vlan) { 4008 const struct net_bridge_vlan *masterv; 4009 4010 /* the vlan has the master flag set only when transmitting 4011 * through the bridge device 4012 */ 4013 if (br_vlan_is_master(vlan)) { 4014 masterv = vlan; 4015 *brmctx = &vlan->br_mcast_ctx; 4016 *pmctx = NULL; 4017 } else { 4018 masterv = vlan->brvlan; 4019 *brmctx = &vlan->brvlan->br_mcast_ctx; 4020 *pmctx = &vlan->port_mcast_ctx; 4021 } 4022 4023 if (!(masterv->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED)) 4024 return 0; 4025 } 4026 4027 switch (skb->protocol) { 4028 case htons(ETH_P_IP): 4029 ret = br_multicast_ipv4_rcv(*brmctx, *pmctx, skb, vid); 4030 break; 4031 #if IS_ENABLED(CONFIG_IPV6) 4032 case htons(ETH_P_IPV6): 4033 ret = br_multicast_ipv6_rcv(*brmctx, *pmctx, skb, vid); 4034 break; 4035 #endif 4036 } 4037 4038 return ret; 4039 } 4040 4041 static void br_multicast_query_expired(struct net_bridge_mcast *brmctx, 4042 struct bridge_mcast_own_query *query, 4043 struct bridge_mcast_querier *querier) 4044 { 4045 spin_lock(&brmctx->br->multicast_lock); 4046 if (br_multicast_ctx_vlan_disabled(brmctx)) 4047 goto out; 4048 4049 if (query->startup_sent < brmctx->multicast_startup_query_count) 4050 query->startup_sent++; 4051 4052 br_multicast_send_query(brmctx, NULL, query); 4053 out: 4054 spin_unlock(&brmctx->br->multicast_lock); 4055 } 4056 4057 static void br_ip4_multicast_query_expired(struct timer_list *t) 4058 { 4059 struct net_bridge_mcast *brmctx = from_timer(brmctx, t, 4060 ip4_own_query.timer); 4061 4062 br_multicast_query_expired(brmctx, &brmctx->ip4_own_query, 4063 &brmctx->ip4_querier); 4064 } 4065 4066 #if IS_ENABLED(CONFIG_IPV6) 4067 static void br_ip6_multicast_query_expired(struct timer_list *t) 4068 { 4069 struct net_bridge_mcast *brmctx = from_timer(brmctx, t, 4070 ip6_own_query.timer); 4071 4072 br_multicast_query_expired(brmctx, &brmctx->ip6_own_query, 4073 &brmctx->ip6_querier); 4074 } 4075 #endif 4076 4077 static void br_multicast_gc_work(struct work_struct *work) 4078 { 4079 struct net_bridge *br = container_of(work, struct net_bridge, 4080 mcast_gc_work); 4081 HLIST_HEAD(deleted_head); 4082 4083 spin_lock_bh(&br->multicast_lock); 4084 hlist_move_list(&br->mcast_gc_list, &deleted_head); 4085 spin_unlock_bh(&br->multicast_lock); 4086 4087 br_multicast_gc(&deleted_head); 4088 } 4089 4090 void br_multicast_ctx_init(struct net_bridge *br, 4091 struct net_bridge_vlan *vlan, 4092 struct net_bridge_mcast *brmctx) 4093 { 4094 brmctx->br = br; 4095 brmctx->vlan = vlan; 4096 brmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 4097 brmctx->multicast_last_member_count = 2; 4098 brmctx->multicast_startup_query_count = 2; 4099 4100 brmctx->multicast_last_member_interval = HZ; 4101 brmctx->multicast_query_response_interval = 10 * HZ; 4102 brmctx->multicast_startup_query_interval = 125 * HZ / 4; 4103 brmctx->multicast_query_interval = 125 * HZ; 4104 brmctx->multicast_querier_interval = 255 * HZ; 4105 brmctx->multicast_membership_interval = 260 * HZ; 4106 4107 brmctx->ip4_querier.port_ifidx = 0; 4108 seqcount_spinlock_init(&brmctx->ip4_querier.seq, &br->multicast_lock); 4109 brmctx->multicast_igmp_version = 2; 4110 #if IS_ENABLED(CONFIG_IPV6) 4111 brmctx->multicast_mld_version = 1; 4112 brmctx->ip6_querier.port_ifidx = 0; 4113 seqcount_spinlock_init(&brmctx->ip6_querier.seq, &br->multicast_lock); 4114 #endif 4115 4116 timer_setup(&brmctx->ip4_mc_router_timer, 4117 br_ip4_multicast_local_router_expired, 0); 4118 timer_setup(&brmctx->ip4_other_query.timer, 4119 br_ip4_multicast_querier_expired, 0); 4120 timer_setup(&brmctx->ip4_other_query.delay_timer, 4121 br_multicast_query_delay_expired, 0); 4122 timer_setup(&brmctx->ip4_own_query.timer, 4123 br_ip4_multicast_query_expired, 0); 4124 #if IS_ENABLED(CONFIG_IPV6) 4125 timer_setup(&brmctx->ip6_mc_router_timer, 4126 br_ip6_multicast_local_router_expired, 0); 4127 timer_setup(&brmctx->ip6_other_query.timer, 4128 br_ip6_multicast_querier_expired, 0); 4129 timer_setup(&brmctx->ip6_other_query.delay_timer, 4130 br_multicast_query_delay_expired, 0); 4131 timer_setup(&brmctx->ip6_own_query.timer, 4132 br_ip6_multicast_query_expired, 0); 4133 #endif 4134 } 4135 4136 void br_multicast_ctx_deinit(struct net_bridge_mcast *brmctx) 4137 { 4138 __br_multicast_stop(brmctx); 4139 } 4140 4141 void br_multicast_init(struct net_bridge *br) 4142 { 4143 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX; 4144 4145 br_multicast_ctx_init(br, NULL, &br->multicast_ctx); 4146 4147 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true); 4148 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true); 4149 4150 spin_lock_init(&br->multicast_lock); 4151 INIT_HLIST_HEAD(&br->mdb_list); 4152 INIT_HLIST_HEAD(&br->mcast_gc_list); 4153 INIT_WORK(&br->mcast_gc_work, br_multicast_gc_work); 4154 } 4155 4156 static void br_ip4_multicast_join_snoopers(struct net_bridge *br) 4157 { 4158 struct in_device *in_dev = in_dev_get(br->dev); 4159 4160 if (!in_dev) 4161 return; 4162 4163 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 4164 in_dev_put(in_dev); 4165 } 4166 4167 #if IS_ENABLED(CONFIG_IPV6) 4168 static void br_ip6_multicast_join_snoopers(struct net_bridge *br) 4169 { 4170 struct in6_addr addr; 4171 4172 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 4173 ipv6_dev_mc_inc(br->dev, &addr); 4174 } 4175 #else 4176 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br) 4177 { 4178 } 4179 #endif 4180 4181 void br_multicast_join_snoopers(struct net_bridge *br) 4182 { 4183 br_ip4_multicast_join_snoopers(br); 4184 br_ip6_multicast_join_snoopers(br); 4185 } 4186 4187 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br) 4188 { 4189 struct in_device *in_dev = in_dev_get(br->dev); 4190 4191 if (WARN_ON(!in_dev)) 4192 return; 4193 4194 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 4195 in_dev_put(in_dev); 4196 } 4197 4198 #if IS_ENABLED(CONFIG_IPV6) 4199 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 4200 { 4201 struct in6_addr addr; 4202 4203 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 4204 ipv6_dev_mc_dec(br->dev, &addr); 4205 } 4206 #else 4207 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 4208 { 4209 } 4210 #endif 4211 4212 void br_multicast_leave_snoopers(struct net_bridge *br) 4213 { 4214 br_ip4_multicast_leave_snoopers(br); 4215 br_ip6_multicast_leave_snoopers(br); 4216 } 4217 4218 static void __br_multicast_open_query(struct net_bridge *br, 4219 struct bridge_mcast_own_query *query) 4220 { 4221 query->startup_sent = 0; 4222 4223 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 4224 return; 4225 4226 mod_timer(&query->timer, jiffies); 4227 } 4228 4229 static void __br_multicast_open(struct net_bridge_mcast *brmctx) 4230 { 4231 __br_multicast_open_query(brmctx->br, &brmctx->ip4_own_query); 4232 #if IS_ENABLED(CONFIG_IPV6) 4233 __br_multicast_open_query(brmctx->br, &brmctx->ip6_own_query); 4234 #endif 4235 } 4236 4237 void br_multicast_open(struct net_bridge *br) 4238 { 4239 ASSERT_RTNL(); 4240 4241 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { 4242 struct net_bridge_vlan_group *vg; 4243 struct net_bridge_vlan *vlan; 4244 4245 vg = br_vlan_group(br); 4246 if (vg) { 4247 list_for_each_entry(vlan, &vg->vlan_list, vlist) { 4248 struct net_bridge_mcast *brmctx; 4249 4250 brmctx = &vlan->br_mcast_ctx; 4251 if (br_vlan_is_brentry(vlan) && 4252 !br_multicast_ctx_vlan_disabled(brmctx)) 4253 __br_multicast_open(&vlan->br_mcast_ctx); 4254 } 4255 } 4256 } else { 4257 __br_multicast_open(&br->multicast_ctx); 4258 } 4259 } 4260 4261 static void __br_multicast_stop(struct net_bridge_mcast *brmctx) 4262 { 4263 timer_delete_sync(&brmctx->ip4_mc_router_timer); 4264 timer_delete_sync(&brmctx->ip4_other_query.timer); 4265 timer_delete_sync(&brmctx->ip4_other_query.delay_timer); 4266 timer_delete_sync(&brmctx->ip4_own_query.timer); 4267 #if IS_ENABLED(CONFIG_IPV6) 4268 timer_delete_sync(&brmctx->ip6_mc_router_timer); 4269 timer_delete_sync(&brmctx->ip6_other_query.timer); 4270 timer_delete_sync(&brmctx->ip6_other_query.delay_timer); 4271 timer_delete_sync(&brmctx->ip6_own_query.timer); 4272 #endif 4273 } 4274 4275 void br_multicast_update_vlan_mcast_ctx(struct net_bridge_vlan *v, u8 state) 4276 { 4277 #if IS_ENABLED(CONFIG_BRIDGE_VLAN_FILTERING) 4278 struct net_bridge *br; 4279 4280 if (!br_vlan_should_use(v)) 4281 return; 4282 4283 if (br_vlan_is_master(v)) 4284 return; 4285 4286 br = v->port->br; 4287 4288 if (!br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) 4289 return; 4290 4291 if (br_vlan_state_allowed(state, true)) 4292 br_multicast_enable_port_ctx(&v->port_mcast_ctx); 4293 4294 /* Multicast is not disabled for the vlan when it goes in 4295 * blocking state because the timers will expire and stop by 4296 * themselves without sending more queries. 4297 */ 4298 #endif 4299 } 4300 4301 void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on) 4302 { 4303 struct net_bridge *br; 4304 4305 /* it's okay to check for the flag without the multicast lock because it 4306 * can only change under RTNL -> multicast_lock, we need the latter to 4307 * sync with timers and packets 4308 */ 4309 if (on == !!(vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) 4310 return; 4311 4312 if (br_vlan_is_master(vlan)) { 4313 br = vlan->br; 4314 4315 if (!br_vlan_is_brentry(vlan) || 4316 (on && 4317 br_multicast_ctx_vlan_global_disabled(&vlan->br_mcast_ctx))) 4318 return; 4319 4320 spin_lock_bh(&br->multicast_lock); 4321 vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED; 4322 spin_unlock_bh(&br->multicast_lock); 4323 4324 if (on) 4325 __br_multicast_open(&vlan->br_mcast_ctx); 4326 else 4327 __br_multicast_stop(&vlan->br_mcast_ctx); 4328 } else { 4329 struct net_bridge_mcast *brmctx; 4330 4331 brmctx = br_multicast_port_ctx_get_global(&vlan->port_mcast_ctx); 4332 if (on && br_multicast_ctx_vlan_global_disabled(brmctx)) 4333 return; 4334 4335 br = vlan->port->br; 4336 spin_lock_bh(&br->multicast_lock); 4337 vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED; 4338 if (on) 4339 __br_multicast_enable_port_ctx(&vlan->port_mcast_ctx); 4340 else 4341 __br_multicast_disable_port_ctx(&vlan->port_mcast_ctx); 4342 spin_unlock_bh(&br->multicast_lock); 4343 } 4344 } 4345 4346 static void br_multicast_toggle_vlan(struct net_bridge_vlan *vlan, bool on) 4347 { 4348 struct net_bridge_port *p; 4349 4350 if (WARN_ON_ONCE(!br_vlan_is_master(vlan))) 4351 return; 4352 4353 list_for_each_entry(p, &vlan->br->port_list, list) { 4354 struct net_bridge_vlan *vport; 4355 4356 vport = br_vlan_find(nbp_vlan_group(p), vlan->vid); 4357 if (!vport) 4358 continue; 4359 br_multicast_toggle_one_vlan(vport, on); 4360 } 4361 4362 if (br_vlan_is_brentry(vlan)) 4363 br_multicast_toggle_one_vlan(vlan, on); 4364 } 4365 4366 int br_multicast_toggle_vlan_snooping(struct net_bridge *br, bool on, 4367 struct netlink_ext_ack *extack) 4368 { 4369 struct net_bridge_vlan_group *vg; 4370 struct net_bridge_vlan *vlan; 4371 struct net_bridge_port *p; 4372 4373 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) == on) 4374 return 0; 4375 4376 if (on && !br_opt_get(br, BROPT_VLAN_ENABLED)) { 4377 NL_SET_ERR_MSG_MOD(extack, "Cannot enable multicast vlan snooping with vlan filtering disabled"); 4378 return -EINVAL; 4379 } 4380 4381 vg = br_vlan_group(br); 4382 if (!vg) 4383 return 0; 4384 4385 br_opt_toggle(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED, on); 4386 4387 /* disable/enable non-vlan mcast contexts based on vlan snooping */ 4388 if (on) 4389 __br_multicast_stop(&br->multicast_ctx); 4390 else 4391 __br_multicast_open(&br->multicast_ctx); 4392 list_for_each_entry(p, &br->port_list, list) { 4393 if (on) 4394 br_multicast_disable_port_ctx(&p->multicast_ctx); 4395 else 4396 br_multicast_enable_port_ctx(&p->multicast_ctx); 4397 } 4398 4399 list_for_each_entry(vlan, &vg->vlan_list, vlist) 4400 br_multicast_toggle_vlan(vlan, on); 4401 4402 return 0; 4403 } 4404 4405 bool br_multicast_toggle_global_vlan(struct net_bridge_vlan *vlan, bool on) 4406 { 4407 ASSERT_RTNL(); 4408 4409 /* BR_VLFLAG_GLOBAL_MCAST_ENABLED relies on eventual consistency and 4410 * requires only RTNL to change 4411 */ 4412 if (on == !!(vlan->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED)) 4413 return false; 4414 4415 vlan->priv_flags ^= BR_VLFLAG_GLOBAL_MCAST_ENABLED; 4416 br_multicast_toggle_vlan(vlan, on); 4417 4418 return true; 4419 } 4420 4421 void br_multicast_stop(struct net_bridge *br) 4422 { 4423 ASSERT_RTNL(); 4424 4425 if (br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { 4426 struct net_bridge_vlan_group *vg; 4427 struct net_bridge_vlan *vlan; 4428 4429 vg = br_vlan_group(br); 4430 if (vg) { 4431 list_for_each_entry(vlan, &vg->vlan_list, vlist) { 4432 struct net_bridge_mcast *brmctx; 4433 4434 brmctx = &vlan->br_mcast_ctx; 4435 if (br_vlan_is_brentry(vlan) && 4436 !br_multicast_ctx_vlan_disabled(brmctx)) 4437 __br_multicast_stop(&vlan->br_mcast_ctx); 4438 } 4439 } 4440 } else { 4441 __br_multicast_stop(&br->multicast_ctx); 4442 } 4443 } 4444 4445 void br_multicast_dev_del(struct net_bridge *br) 4446 { 4447 struct net_bridge_mdb_entry *mp; 4448 HLIST_HEAD(deleted_head); 4449 struct hlist_node *tmp; 4450 4451 spin_lock_bh(&br->multicast_lock); 4452 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) 4453 br_multicast_del_mdb_entry(mp); 4454 hlist_move_list(&br->mcast_gc_list, &deleted_head); 4455 spin_unlock_bh(&br->multicast_lock); 4456 4457 br_multicast_ctx_deinit(&br->multicast_ctx); 4458 br_multicast_gc(&deleted_head); 4459 cancel_work_sync(&br->mcast_gc_work); 4460 4461 rcu_barrier(); 4462 } 4463 4464 int br_multicast_set_router(struct net_bridge_mcast *brmctx, unsigned long val) 4465 { 4466 int err = -EINVAL; 4467 4468 spin_lock_bh(&brmctx->br->multicast_lock); 4469 4470 switch (val) { 4471 case MDB_RTR_TYPE_DISABLED: 4472 case MDB_RTR_TYPE_PERM: 4473 br_mc_router_state_change(brmctx->br, val == MDB_RTR_TYPE_PERM); 4474 timer_delete(&brmctx->ip4_mc_router_timer); 4475 #if IS_ENABLED(CONFIG_IPV6) 4476 timer_delete(&brmctx->ip6_mc_router_timer); 4477 #endif 4478 brmctx->multicast_router = val; 4479 err = 0; 4480 break; 4481 case MDB_RTR_TYPE_TEMP_QUERY: 4482 if (brmctx->multicast_router != MDB_RTR_TYPE_TEMP_QUERY) 4483 br_mc_router_state_change(brmctx->br, false); 4484 brmctx->multicast_router = val; 4485 err = 0; 4486 break; 4487 } 4488 4489 spin_unlock_bh(&brmctx->br->multicast_lock); 4490 4491 return err; 4492 } 4493 4494 static void 4495 br_multicast_rport_del_notify(struct net_bridge_mcast_port *pmctx, bool deleted) 4496 { 4497 if (!deleted) 4498 return; 4499 4500 /* For backwards compatibility for now, only notify if there is 4501 * no multicast router anymore for both IPv4 and IPv6. 4502 */ 4503 if (!hlist_unhashed(&pmctx->ip4_rlist)) 4504 return; 4505 #if IS_ENABLED(CONFIG_IPV6) 4506 if (!hlist_unhashed(&pmctx->ip6_rlist)) 4507 return; 4508 #endif 4509 4510 br_rtr_notify(pmctx->port->br->dev, pmctx, RTM_DELMDB); 4511 br_port_mc_router_state_change(pmctx->port, false); 4512 4513 /* don't allow timer refresh */ 4514 if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP) 4515 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 4516 } 4517 4518 int br_multicast_set_port_router(struct net_bridge_mcast_port *pmctx, 4519 unsigned long val) 4520 { 4521 struct net_bridge_mcast *brmctx; 4522 unsigned long now = jiffies; 4523 int err = -EINVAL; 4524 bool del = false; 4525 4526 brmctx = br_multicast_port_ctx_get_global(pmctx); 4527 spin_lock_bh(&brmctx->br->multicast_lock); 4528 if (pmctx->multicast_router == val) { 4529 /* Refresh the temp router port timer */ 4530 if (pmctx->multicast_router == MDB_RTR_TYPE_TEMP) { 4531 mod_timer(&pmctx->ip4_mc_router_timer, 4532 now + brmctx->multicast_querier_interval); 4533 #if IS_ENABLED(CONFIG_IPV6) 4534 mod_timer(&pmctx->ip6_mc_router_timer, 4535 now + brmctx->multicast_querier_interval); 4536 #endif 4537 } 4538 err = 0; 4539 goto unlock; 4540 } 4541 switch (val) { 4542 case MDB_RTR_TYPE_DISABLED: 4543 pmctx->multicast_router = MDB_RTR_TYPE_DISABLED; 4544 del |= br_ip4_multicast_rport_del(pmctx); 4545 timer_delete(&pmctx->ip4_mc_router_timer); 4546 del |= br_ip6_multicast_rport_del(pmctx); 4547 #if IS_ENABLED(CONFIG_IPV6) 4548 timer_delete(&pmctx->ip6_mc_router_timer); 4549 #endif 4550 br_multicast_rport_del_notify(pmctx, del); 4551 break; 4552 case MDB_RTR_TYPE_TEMP_QUERY: 4553 pmctx->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 4554 del |= br_ip4_multicast_rport_del(pmctx); 4555 del |= br_ip6_multicast_rport_del(pmctx); 4556 br_multicast_rport_del_notify(pmctx, del); 4557 break; 4558 case MDB_RTR_TYPE_PERM: 4559 pmctx->multicast_router = MDB_RTR_TYPE_PERM; 4560 timer_delete(&pmctx->ip4_mc_router_timer); 4561 br_ip4_multicast_add_router(brmctx, pmctx); 4562 #if IS_ENABLED(CONFIG_IPV6) 4563 timer_delete(&pmctx->ip6_mc_router_timer); 4564 #endif 4565 br_ip6_multicast_add_router(brmctx, pmctx); 4566 break; 4567 case MDB_RTR_TYPE_TEMP: 4568 pmctx->multicast_router = MDB_RTR_TYPE_TEMP; 4569 br_ip4_multicast_mark_router(brmctx, pmctx); 4570 br_ip6_multicast_mark_router(brmctx, pmctx); 4571 break; 4572 default: 4573 goto unlock; 4574 } 4575 err = 0; 4576 unlock: 4577 spin_unlock_bh(&brmctx->br->multicast_lock); 4578 4579 return err; 4580 } 4581 4582 int br_multicast_set_vlan_router(struct net_bridge_vlan *v, u8 mcast_router) 4583 { 4584 int err; 4585 4586 if (br_vlan_is_master(v)) 4587 err = br_multicast_set_router(&v->br_mcast_ctx, mcast_router); 4588 else 4589 err = br_multicast_set_port_router(&v->port_mcast_ctx, 4590 mcast_router); 4591 4592 return err; 4593 } 4594 4595 static void br_multicast_start_querier(struct net_bridge_mcast *brmctx, 4596 struct bridge_mcast_own_query *query) 4597 { 4598 struct net_bridge_port *port; 4599 4600 if (!br_multicast_ctx_matches_vlan_snooping(brmctx)) 4601 return; 4602 4603 __br_multicast_open_query(brmctx->br, query); 4604 4605 rcu_read_lock(); 4606 list_for_each_entry_rcu(port, &brmctx->br->port_list, list) { 4607 struct bridge_mcast_own_query *ip4_own_query; 4608 #if IS_ENABLED(CONFIG_IPV6) 4609 struct bridge_mcast_own_query *ip6_own_query; 4610 #endif 4611 4612 if (br_multicast_port_ctx_state_stopped(&port->multicast_ctx)) 4613 continue; 4614 4615 if (br_multicast_ctx_is_vlan(brmctx)) { 4616 struct net_bridge_vlan *vlan; 4617 4618 vlan = br_vlan_find(nbp_vlan_group_rcu(port), 4619 brmctx->vlan->vid); 4620 if (!vlan || 4621 br_multicast_port_ctx_state_stopped(&vlan->port_mcast_ctx)) 4622 continue; 4623 4624 ip4_own_query = &vlan->port_mcast_ctx.ip4_own_query; 4625 #if IS_ENABLED(CONFIG_IPV6) 4626 ip6_own_query = &vlan->port_mcast_ctx.ip6_own_query; 4627 #endif 4628 } else { 4629 ip4_own_query = &port->multicast_ctx.ip4_own_query; 4630 #if IS_ENABLED(CONFIG_IPV6) 4631 ip6_own_query = &port->multicast_ctx.ip6_own_query; 4632 #endif 4633 } 4634 4635 if (query == &brmctx->ip4_own_query) 4636 br_multicast_enable(ip4_own_query); 4637 #if IS_ENABLED(CONFIG_IPV6) 4638 else 4639 br_multicast_enable(ip6_own_query); 4640 #endif 4641 } 4642 rcu_read_unlock(); 4643 } 4644 4645 int br_multicast_toggle(struct net_bridge *br, unsigned long val, 4646 struct netlink_ext_ack *extack) 4647 { 4648 struct net_bridge_port *port; 4649 bool change_snoopers = false; 4650 int err = 0; 4651 4652 spin_lock_bh(&br->multicast_lock); 4653 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val) 4654 goto unlock; 4655 4656 err = br_mc_disabled_update(br->dev, val, extack); 4657 if (err == -EOPNOTSUPP) 4658 err = 0; 4659 if (err) 4660 goto unlock; 4661 4662 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val); 4663 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) { 4664 change_snoopers = true; 4665 goto unlock; 4666 } 4667 4668 if (!netif_running(br->dev)) 4669 goto unlock; 4670 4671 br_multicast_open(br); 4672 list_for_each_entry(port, &br->port_list, list) 4673 __br_multicast_enable_port_ctx(&port->multicast_ctx); 4674 4675 change_snoopers = true; 4676 4677 unlock: 4678 spin_unlock_bh(&br->multicast_lock); 4679 4680 /* br_multicast_join_snoopers has the potential to cause 4681 * an MLD Report/Leave to be delivered to br_multicast_rcv, 4682 * which would in turn call br_multicast_add_group, which would 4683 * attempt to acquire multicast_lock. This function should be 4684 * called after the lock has been released to avoid deadlocks on 4685 * multicast_lock. 4686 * 4687 * br_multicast_leave_snoopers does not have the problem since 4688 * br_multicast_rcv first checks BROPT_MULTICAST_ENABLED, and 4689 * returns without calling br_multicast_ipv4/6_rcv if it's not 4690 * enabled. Moved both functions out just for symmetry. 4691 */ 4692 if (change_snoopers) { 4693 if (br_opt_get(br, BROPT_MULTICAST_ENABLED)) 4694 br_multicast_join_snoopers(br); 4695 else 4696 br_multicast_leave_snoopers(br); 4697 } 4698 4699 return err; 4700 } 4701 4702 bool br_multicast_enabled(const struct net_device *dev) 4703 { 4704 struct net_bridge *br = netdev_priv(dev); 4705 4706 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED); 4707 } 4708 EXPORT_SYMBOL_GPL(br_multicast_enabled); 4709 4710 bool br_multicast_router(const struct net_device *dev) 4711 { 4712 struct net_bridge *br = netdev_priv(dev); 4713 bool is_router; 4714 4715 spin_lock_bh(&br->multicast_lock); 4716 is_router = br_multicast_is_router(&br->multicast_ctx, NULL); 4717 spin_unlock_bh(&br->multicast_lock); 4718 return is_router; 4719 } 4720 EXPORT_SYMBOL_GPL(br_multicast_router); 4721 4722 int br_multicast_set_querier(struct net_bridge_mcast *brmctx, unsigned long val) 4723 { 4724 unsigned long max_delay; 4725 4726 val = !!val; 4727 4728 spin_lock_bh(&brmctx->br->multicast_lock); 4729 if (brmctx->multicast_querier == val) 4730 goto unlock; 4731 4732 WRITE_ONCE(brmctx->multicast_querier, val); 4733 if (!val) 4734 goto unlock; 4735 4736 max_delay = brmctx->multicast_query_response_interval; 4737 4738 if (!timer_pending(&brmctx->ip4_other_query.timer)) 4739 mod_timer(&brmctx->ip4_other_query.delay_timer, 4740 jiffies + max_delay); 4741 4742 br_multicast_start_querier(brmctx, &brmctx->ip4_own_query); 4743 4744 #if IS_ENABLED(CONFIG_IPV6) 4745 if (!timer_pending(&brmctx->ip6_other_query.timer)) 4746 mod_timer(&brmctx->ip6_other_query.delay_timer, 4747 jiffies + max_delay); 4748 4749 br_multicast_start_querier(brmctx, &brmctx->ip6_own_query); 4750 #endif 4751 4752 unlock: 4753 spin_unlock_bh(&brmctx->br->multicast_lock); 4754 4755 return 0; 4756 } 4757 4758 int br_multicast_set_igmp_version(struct net_bridge_mcast *brmctx, 4759 unsigned long val) 4760 { 4761 /* Currently we support only version 2 and 3 */ 4762 switch (val) { 4763 case 2: 4764 case 3: 4765 break; 4766 default: 4767 return -EINVAL; 4768 } 4769 4770 spin_lock_bh(&brmctx->br->multicast_lock); 4771 brmctx->multicast_igmp_version = val; 4772 spin_unlock_bh(&brmctx->br->multicast_lock); 4773 4774 return 0; 4775 } 4776 4777 #if IS_ENABLED(CONFIG_IPV6) 4778 int br_multicast_set_mld_version(struct net_bridge_mcast *brmctx, 4779 unsigned long val) 4780 { 4781 /* Currently we support version 1 and 2 */ 4782 switch (val) { 4783 case 1: 4784 case 2: 4785 break; 4786 default: 4787 return -EINVAL; 4788 } 4789 4790 spin_lock_bh(&brmctx->br->multicast_lock); 4791 brmctx->multicast_mld_version = val; 4792 spin_unlock_bh(&brmctx->br->multicast_lock); 4793 4794 return 0; 4795 } 4796 #endif 4797 4798 void br_multicast_set_query_intvl(struct net_bridge_mcast *brmctx, 4799 unsigned long val) 4800 { 4801 unsigned long intvl_jiffies = clock_t_to_jiffies(val); 4802 4803 if (intvl_jiffies < BR_MULTICAST_QUERY_INTVL_MIN) { 4804 br_info(brmctx->br, 4805 "trying to set multicast query interval below minimum, setting to %lu (%ums)\n", 4806 jiffies_to_clock_t(BR_MULTICAST_QUERY_INTVL_MIN), 4807 jiffies_to_msecs(BR_MULTICAST_QUERY_INTVL_MIN)); 4808 intvl_jiffies = BR_MULTICAST_QUERY_INTVL_MIN; 4809 } 4810 4811 brmctx->multicast_query_interval = intvl_jiffies; 4812 } 4813 4814 void br_multicast_set_startup_query_intvl(struct net_bridge_mcast *brmctx, 4815 unsigned long val) 4816 { 4817 unsigned long intvl_jiffies = clock_t_to_jiffies(val); 4818 4819 if (intvl_jiffies < BR_MULTICAST_STARTUP_QUERY_INTVL_MIN) { 4820 br_info(brmctx->br, 4821 "trying to set multicast startup query interval below minimum, setting to %lu (%ums)\n", 4822 jiffies_to_clock_t(BR_MULTICAST_STARTUP_QUERY_INTVL_MIN), 4823 jiffies_to_msecs(BR_MULTICAST_STARTUP_QUERY_INTVL_MIN)); 4824 intvl_jiffies = BR_MULTICAST_STARTUP_QUERY_INTVL_MIN; 4825 } 4826 4827 brmctx->multicast_startup_query_interval = intvl_jiffies; 4828 } 4829 4830 /** 4831 * br_multicast_list_adjacent - Returns snooped multicast addresses 4832 * @dev: The bridge port adjacent to which to retrieve addresses 4833 * @br_ip_list: The list to store found, snooped multicast IP addresses in 4834 * 4835 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast 4836 * snooping feature on all bridge ports of dev's bridge device, excluding 4837 * the addresses from dev itself. 4838 * 4839 * Returns the number of items added to br_ip_list. 4840 * 4841 * Notes: 4842 * - br_ip_list needs to be initialized by caller 4843 * - br_ip_list might contain duplicates in the end 4844 * (needs to be taken care of by caller) 4845 * - br_ip_list needs to be freed by caller 4846 */ 4847 int br_multicast_list_adjacent(struct net_device *dev, 4848 struct list_head *br_ip_list) 4849 { 4850 struct net_bridge *br; 4851 struct net_bridge_port *port; 4852 struct net_bridge_port_group *group; 4853 struct br_ip_list *entry; 4854 int count = 0; 4855 4856 rcu_read_lock(); 4857 if (!br_ip_list || !netif_is_bridge_port(dev)) 4858 goto unlock; 4859 4860 port = br_port_get_rcu(dev); 4861 if (!port || !port->br) 4862 goto unlock; 4863 4864 br = port->br; 4865 4866 list_for_each_entry_rcu(port, &br->port_list, list) { 4867 if (!port->dev || port->dev == dev) 4868 continue; 4869 4870 hlist_for_each_entry_rcu(group, &port->mglist, mglist) { 4871 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 4872 if (!entry) 4873 goto unlock; 4874 4875 entry->addr = group->key.addr; 4876 list_add(&entry->list, br_ip_list); 4877 count++; 4878 } 4879 } 4880 4881 unlock: 4882 rcu_read_unlock(); 4883 return count; 4884 } 4885 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); 4886 4887 /** 4888 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge 4889 * @dev: The bridge port providing the bridge on which to check for a querier 4890 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 4891 * 4892 * Checks whether the given interface has a bridge on top and if so returns 4893 * true if a valid querier exists anywhere on the bridged link layer. 4894 * Otherwise returns false. 4895 */ 4896 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto) 4897 { 4898 struct net_bridge *br; 4899 struct net_bridge_port *port; 4900 struct ethhdr eth; 4901 bool ret = false; 4902 4903 rcu_read_lock(); 4904 if (!netif_is_bridge_port(dev)) 4905 goto unlock; 4906 4907 port = br_port_get_rcu(dev); 4908 if (!port || !port->br) 4909 goto unlock; 4910 4911 br = port->br; 4912 4913 memset(ð, 0, sizeof(eth)); 4914 eth.h_proto = htons(proto); 4915 4916 ret = br_multicast_querier_exists(&br->multicast_ctx, ð, NULL); 4917 4918 unlock: 4919 rcu_read_unlock(); 4920 return ret; 4921 } 4922 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere); 4923 4924 /** 4925 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port 4926 * @dev: The bridge port adjacent to which to check for a querier 4927 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 4928 * 4929 * Checks whether the given interface has a bridge on top and if so returns 4930 * true if a selected querier is behind one of the other ports of this 4931 * bridge. Otherwise returns false. 4932 */ 4933 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) 4934 { 4935 struct net_bridge_mcast *brmctx; 4936 struct net_bridge *br; 4937 struct net_bridge_port *port; 4938 bool ret = false; 4939 int port_ifidx; 4940 4941 rcu_read_lock(); 4942 if (!netif_is_bridge_port(dev)) 4943 goto unlock; 4944 4945 port = br_port_get_rcu(dev); 4946 if (!port || !port->br) 4947 goto unlock; 4948 4949 br = port->br; 4950 brmctx = &br->multicast_ctx; 4951 4952 switch (proto) { 4953 case ETH_P_IP: 4954 port_ifidx = brmctx->ip4_querier.port_ifidx; 4955 if (!timer_pending(&brmctx->ip4_other_query.timer) || 4956 port_ifidx == port->dev->ifindex) 4957 goto unlock; 4958 break; 4959 #if IS_ENABLED(CONFIG_IPV6) 4960 case ETH_P_IPV6: 4961 port_ifidx = brmctx->ip6_querier.port_ifidx; 4962 if (!timer_pending(&brmctx->ip6_other_query.timer) || 4963 port_ifidx == port->dev->ifindex) 4964 goto unlock; 4965 break; 4966 #endif 4967 default: 4968 goto unlock; 4969 } 4970 4971 ret = true; 4972 unlock: 4973 rcu_read_unlock(); 4974 return ret; 4975 } 4976 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); 4977 4978 /** 4979 * br_multicast_has_router_adjacent - Checks for a router behind a bridge port 4980 * @dev: The bridge port adjacent to which to check for a multicast router 4981 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 4982 * 4983 * Checks whether the given interface has a bridge on top and if so returns 4984 * true if a multicast router is behind one of the other ports of this 4985 * bridge. Otherwise returns false. 4986 */ 4987 bool br_multicast_has_router_adjacent(struct net_device *dev, int proto) 4988 { 4989 struct net_bridge_mcast_port *pmctx; 4990 struct net_bridge_mcast *brmctx; 4991 struct net_bridge_port *port; 4992 bool ret = false; 4993 4994 rcu_read_lock(); 4995 port = br_port_get_check_rcu(dev); 4996 if (!port) 4997 goto unlock; 4998 4999 brmctx = &port->br->multicast_ctx; 5000 switch (proto) { 5001 case ETH_P_IP: 5002 hlist_for_each_entry_rcu(pmctx, &brmctx->ip4_mc_router_list, 5003 ip4_rlist) { 5004 if (pmctx->port == port) 5005 continue; 5006 5007 ret = true; 5008 goto unlock; 5009 } 5010 break; 5011 #if IS_ENABLED(CONFIG_IPV6) 5012 case ETH_P_IPV6: 5013 hlist_for_each_entry_rcu(pmctx, &brmctx->ip6_mc_router_list, 5014 ip6_rlist) { 5015 if (pmctx->port == port) 5016 continue; 5017 5018 ret = true; 5019 goto unlock; 5020 } 5021 break; 5022 #endif 5023 default: 5024 /* when compiled without IPv6 support, be conservative and 5025 * always assume presence of an IPv6 multicast router 5026 */ 5027 ret = true; 5028 } 5029 5030 unlock: 5031 rcu_read_unlock(); 5032 return ret; 5033 } 5034 EXPORT_SYMBOL_GPL(br_multicast_has_router_adjacent); 5035 5036 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats, 5037 const struct sk_buff *skb, u8 type, u8 dir) 5038 { 5039 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats); 5040 __be16 proto = skb->protocol; 5041 unsigned int t_len; 5042 5043 u64_stats_update_begin(&pstats->syncp); 5044 switch (proto) { 5045 case htons(ETH_P_IP): 5046 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); 5047 switch (type) { 5048 case IGMP_HOST_MEMBERSHIP_REPORT: 5049 pstats->mstats.igmp_v1reports[dir]++; 5050 break; 5051 case IGMPV2_HOST_MEMBERSHIP_REPORT: 5052 pstats->mstats.igmp_v2reports[dir]++; 5053 break; 5054 case IGMPV3_HOST_MEMBERSHIP_REPORT: 5055 pstats->mstats.igmp_v3reports[dir]++; 5056 break; 5057 case IGMP_HOST_MEMBERSHIP_QUERY: 5058 if (t_len != sizeof(struct igmphdr)) { 5059 pstats->mstats.igmp_v3queries[dir]++; 5060 } else { 5061 unsigned int offset = skb_transport_offset(skb); 5062 struct igmphdr *ih, _ihdr; 5063 5064 ih = skb_header_pointer(skb, offset, 5065 sizeof(_ihdr), &_ihdr); 5066 if (!ih) 5067 break; 5068 if (!ih->code) 5069 pstats->mstats.igmp_v1queries[dir]++; 5070 else 5071 pstats->mstats.igmp_v2queries[dir]++; 5072 } 5073 break; 5074 case IGMP_HOST_LEAVE_MESSAGE: 5075 pstats->mstats.igmp_leaves[dir]++; 5076 break; 5077 } 5078 break; 5079 #if IS_ENABLED(CONFIG_IPV6) 5080 case htons(ETH_P_IPV6): 5081 t_len = ntohs(ipv6_hdr(skb)->payload_len) + 5082 sizeof(struct ipv6hdr); 5083 t_len -= skb_network_header_len(skb); 5084 switch (type) { 5085 case ICMPV6_MGM_REPORT: 5086 pstats->mstats.mld_v1reports[dir]++; 5087 break; 5088 case ICMPV6_MLD2_REPORT: 5089 pstats->mstats.mld_v2reports[dir]++; 5090 break; 5091 case ICMPV6_MGM_QUERY: 5092 if (t_len != sizeof(struct mld_msg)) 5093 pstats->mstats.mld_v2queries[dir]++; 5094 else 5095 pstats->mstats.mld_v1queries[dir]++; 5096 break; 5097 case ICMPV6_MGM_REDUCTION: 5098 pstats->mstats.mld_leaves[dir]++; 5099 break; 5100 } 5101 break; 5102 #endif /* CONFIG_IPV6 */ 5103 } 5104 u64_stats_update_end(&pstats->syncp); 5105 } 5106 5107 void br_multicast_count(struct net_bridge *br, 5108 const struct net_bridge_port *p, 5109 const struct sk_buff *skb, u8 type, u8 dir) 5110 { 5111 struct bridge_mcast_stats __percpu *stats; 5112 5113 /* if multicast_disabled is true then igmp type can't be set */ 5114 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 5115 return; 5116 5117 if (p) 5118 stats = p->mcast_stats; 5119 else 5120 stats = br->mcast_stats; 5121 if (WARN_ON(!stats)) 5122 return; 5123 5124 br_mcast_stats_add(stats, skb, type, dir); 5125 } 5126 5127 int br_multicast_init_stats(struct net_bridge *br) 5128 { 5129 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 5130 if (!br->mcast_stats) 5131 return -ENOMEM; 5132 5133 return 0; 5134 } 5135 5136 void br_multicast_uninit_stats(struct net_bridge *br) 5137 { 5138 free_percpu(br->mcast_stats); 5139 } 5140 5141 /* noinline for https://llvm.org/pr45802#c9 */ 5142 static noinline_for_stack void mcast_stats_add_dir(u64 *dst, u64 *src) 5143 { 5144 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX]; 5145 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX]; 5146 } 5147 5148 void br_multicast_get_stats(const struct net_bridge *br, 5149 const struct net_bridge_port *p, 5150 struct br_mcast_stats *dest) 5151 { 5152 struct bridge_mcast_stats __percpu *stats; 5153 struct br_mcast_stats tdst; 5154 int i; 5155 5156 memset(dest, 0, sizeof(*dest)); 5157 if (p) 5158 stats = p->mcast_stats; 5159 else 5160 stats = br->mcast_stats; 5161 if (WARN_ON(!stats)) 5162 return; 5163 5164 memset(&tdst, 0, sizeof(tdst)); 5165 for_each_possible_cpu(i) { 5166 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i); 5167 struct br_mcast_stats temp; 5168 unsigned int start; 5169 5170 do { 5171 start = u64_stats_fetch_begin(&cpu_stats->syncp); 5172 memcpy(&temp, &cpu_stats->mstats, sizeof(temp)); 5173 } while (u64_stats_fetch_retry(&cpu_stats->syncp, start)); 5174 5175 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries); 5176 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries); 5177 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries); 5178 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves); 5179 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports); 5180 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports); 5181 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports); 5182 tdst.igmp_parse_errors += temp.igmp_parse_errors; 5183 5184 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries); 5185 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries); 5186 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves); 5187 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports); 5188 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports); 5189 tdst.mld_parse_errors += temp.mld_parse_errors; 5190 } 5191 memcpy(dest, &tdst, sizeof(*dest)); 5192 } 5193 5194 int br_mdb_hash_init(struct net_bridge *br) 5195 { 5196 int err; 5197 5198 err = rhashtable_init(&br->sg_port_tbl, &br_sg_port_rht_params); 5199 if (err) 5200 return err; 5201 5202 err = rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params); 5203 if (err) { 5204 rhashtable_destroy(&br->sg_port_tbl); 5205 return err; 5206 } 5207 5208 return 0; 5209 } 5210 5211 void br_mdb_hash_fini(struct net_bridge *br) 5212 { 5213 rhashtable_destroy(&br->sg_port_tbl); 5214 rhashtable_destroy(&br->mdb_hash_tbl); 5215 } 5216