1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Bridge multicast support. 4 * 5 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> 6 */ 7 8 #include <linux/err.h> 9 #include <linux/export.h> 10 #include <linux/if_ether.h> 11 #include <linux/igmp.h> 12 #include <linux/in.h> 13 #include <linux/jhash.h> 14 #include <linux/kernel.h> 15 #include <linux/log2.h> 16 #include <linux/netdevice.h> 17 #include <linux/netfilter_bridge.h> 18 #include <linux/random.h> 19 #include <linux/rculist.h> 20 #include <linux/skbuff.h> 21 #include <linux/slab.h> 22 #include <linux/timer.h> 23 #include <linux/inetdevice.h> 24 #include <linux/mroute.h> 25 #include <net/ip.h> 26 #include <net/switchdev.h> 27 #if IS_ENABLED(CONFIG_IPV6) 28 #include <linux/icmpv6.h> 29 #include <net/ipv6.h> 30 #include <net/mld.h> 31 #include <net/ip6_checksum.h> 32 #include <net/addrconf.h> 33 #endif 34 35 #include "br_private.h" 36 37 static const struct rhashtable_params br_mdb_rht_params = { 38 .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode), 39 .key_offset = offsetof(struct net_bridge_mdb_entry, addr), 40 .key_len = sizeof(struct br_ip), 41 .automatic_shrinking = true, 42 }; 43 44 static void br_multicast_start_querier(struct net_bridge *br, 45 struct bridge_mcast_own_query *query); 46 static void br_multicast_add_router(struct net_bridge *br, 47 struct net_bridge_port *port); 48 static void br_ip4_multicast_leave_group(struct net_bridge *br, 49 struct net_bridge_port *port, 50 __be32 group, 51 __u16 vid, 52 const unsigned char *src); 53 static void br_multicast_port_group_rexmit(struct timer_list *t); 54 55 static void __del_port_router(struct net_bridge_port *p); 56 #if IS_ENABLED(CONFIG_IPV6) 57 static void br_ip6_multicast_leave_group(struct net_bridge *br, 58 struct net_bridge_port *port, 59 const struct in6_addr *group, 60 __u16 vid, const unsigned char *src); 61 #endif 62 63 static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br, 64 struct br_ip *dst) 65 { 66 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params); 67 } 68 69 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br, 70 struct br_ip *dst) 71 { 72 struct net_bridge_mdb_entry *ent; 73 74 lockdep_assert_held_once(&br->multicast_lock); 75 76 rcu_read_lock(); 77 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params); 78 rcu_read_unlock(); 79 80 return ent; 81 } 82 83 static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br, 84 __be32 dst, __u16 vid) 85 { 86 struct br_ip br_dst; 87 88 memset(&br_dst, 0, sizeof(br_dst)); 89 br_dst.u.ip4 = dst; 90 br_dst.proto = htons(ETH_P_IP); 91 br_dst.vid = vid; 92 93 return br_mdb_ip_get(br, &br_dst); 94 } 95 96 #if IS_ENABLED(CONFIG_IPV6) 97 static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br, 98 const struct in6_addr *dst, 99 __u16 vid) 100 { 101 struct br_ip br_dst; 102 103 memset(&br_dst, 0, sizeof(br_dst)); 104 br_dst.u.ip6 = *dst; 105 br_dst.proto = htons(ETH_P_IPV6); 106 br_dst.vid = vid; 107 108 return br_mdb_ip_get(br, &br_dst); 109 } 110 #endif 111 112 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 113 struct sk_buff *skb, u16 vid) 114 { 115 struct br_ip ip; 116 117 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 118 return NULL; 119 120 if (BR_INPUT_SKB_CB(skb)->igmp) 121 return NULL; 122 123 memset(&ip, 0, sizeof(ip)); 124 ip.proto = skb->protocol; 125 ip.vid = vid; 126 127 switch (skb->protocol) { 128 case htons(ETH_P_IP): 129 ip.u.ip4 = ip_hdr(skb)->daddr; 130 break; 131 #if IS_ENABLED(CONFIG_IPV6) 132 case htons(ETH_P_IPV6): 133 ip.u.ip6 = ipv6_hdr(skb)->daddr; 134 break; 135 #endif 136 default: 137 return NULL; 138 } 139 140 return br_mdb_ip_get_rcu(br, &ip); 141 } 142 143 static void br_multicast_destroy_mdb_entry(struct net_bridge_mcast_gc *gc) 144 { 145 struct net_bridge_mdb_entry *mp; 146 147 mp = container_of(gc, struct net_bridge_mdb_entry, mcast_gc); 148 WARN_ON(!hlist_unhashed(&mp->mdb_node)); 149 WARN_ON(mp->ports); 150 151 del_timer_sync(&mp->timer); 152 kfree_rcu(mp, rcu); 153 } 154 155 static void br_multicast_del_mdb_entry(struct net_bridge_mdb_entry *mp) 156 { 157 struct net_bridge *br = mp->br; 158 159 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode, 160 br_mdb_rht_params); 161 hlist_del_init_rcu(&mp->mdb_node); 162 hlist_add_head(&mp->mcast_gc.gc_node, &br->mcast_gc_list); 163 queue_work(system_long_wq, &br->mcast_gc_work); 164 } 165 166 static void br_multicast_group_expired(struct timer_list *t) 167 { 168 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer); 169 struct net_bridge *br = mp->br; 170 171 spin_lock(&br->multicast_lock); 172 if (!netif_running(br->dev) || timer_pending(&mp->timer)) 173 goto out; 174 175 br_multicast_host_leave(mp, true); 176 177 if (mp->ports) 178 goto out; 179 br_multicast_del_mdb_entry(mp); 180 out: 181 spin_unlock(&br->multicast_lock); 182 } 183 184 static void br_multicast_destroy_group_src(struct net_bridge_mcast_gc *gc) 185 { 186 struct net_bridge_group_src *src; 187 188 src = container_of(gc, struct net_bridge_group_src, mcast_gc); 189 WARN_ON(!hlist_unhashed(&src->node)); 190 191 del_timer_sync(&src->timer); 192 kfree_rcu(src, rcu); 193 } 194 195 static void br_multicast_del_group_src(struct net_bridge_group_src *src) 196 { 197 struct net_bridge *br = src->pg->port->br; 198 199 hlist_del_init_rcu(&src->node); 200 src->pg->src_ents--; 201 hlist_add_head(&src->mcast_gc.gc_node, &br->mcast_gc_list); 202 queue_work(system_long_wq, &br->mcast_gc_work); 203 } 204 205 static void br_multicast_destroy_port_group(struct net_bridge_mcast_gc *gc) 206 { 207 struct net_bridge_port_group *pg; 208 209 pg = container_of(gc, struct net_bridge_port_group, mcast_gc); 210 WARN_ON(!hlist_unhashed(&pg->mglist)); 211 WARN_ON(!hlist_empty(&pg->src_list)); 212 213 del_timer_sync(&pg->rexmit_timer); 214 del_timer_sync(&pg->timer); 215 kfree_rcu(pg, rcu); 216 } 217 218 void br_multicast_del_pg(struct net_bridge_mdb_entry *mp, 219 struct net_bridge_port_group *pg, 220 struct net_bridge_port_group __rcu **pp) 221 { 222 struct net_bridge *br = pg->port->br; 223 struct net_bridge_group_src *ent; 224 struct hlist_node *tmp; 225 226 rcu_assign_pointer(*pp, pg->next); 227 hlist_del_init(&pg->mglist); 228 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) 229 br_multicast_del_group_src(ent); 230 br_mdb_notify(br->dev, mp, pg, RTM_DELMDB); 231 hlist_add_head(&pg->mcast_gc.gc_node, &br->mcast_gc_list); 232 queue_work(system_long_wq, &br->mcast_gc_work); 233 234 if (!mp->ports && !mp->host_joined && netif_running(br->dev)) 235 mod_timer(&mp->timer, jiffies); 236 } 237 238 static void br_multicast_find_del_pg(struct net_bridge *br, 239 struct net_bridge_port_group *pg) 240 { 241 struct net_bridge_port_group __rcu **pp; 242 struct net_bridge_mdb_entry *mp; 243 struct net_bridge_port_group *p; 244 245 mp = br_mdb_ip_get(br, &pg->addr); 246 if (WARN_ON(!mp)) 247 return; 248 249 for (pp = &mp->ports; 250 (p = mlock_dereference(*pp, br)) != NULL; 251 pp = &p->next) { 252 if (p != pg) 253 continue; 254 255 br_multicast_del_pg(mp, pg, pp); 256 return; 257 } 258 259 WARN_ON(1); 260 } 261 262 static void br_multicast_port_group_expired(struct timer_list *t) 263 { 264 struct net_bridge_port_group *pg = from_timer(pg, t, timer); 265 struct net_bridge_group_src *src_ent; 266 struct net_bridge *br = pg->port->br; 267 struct hlist_node *tmp; 268 bool changed; 269 270 spin_lock(&br->multicast_lock); 271 if (!netif_running(br->dev) || timer_pending(&pg->timer) || 272 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT) 273 goto out; 274 275 changed = !!(pg->filter_mode == MCAST_EXCLUDE); 276 pg->filter_mode = MCAST_INCLUDE; 277 hlist_for_each_entry_safe(src_ent, tmp, &pg->src_list, node) { 278 if (!timer_pending(&src_ent->timer)) { 279 br_multicast_del_group_src(src_ent); 280 changed = true; 281 } 282 } 283 284 if (hlist_empty(&pg->src_list)) { 285 br_multicast_find_del_pg(br, pg); 286 } else if (changed) { 287 struct net_bridge_mdb_entry *mp = br_mdb_ip_get(br, &pg->addr); 288 289 if (WARN_ON(!mp)) 290 goto out; 291 br_mdb_notify(br->dev, mp, pg, RTM_NEWMDB); 292 } 293 out: 294 spin_unlock(&br->multicast_lock); 295 } 296 297 static void br_multicast_gc(struct hlist_head *head) 298 { 299 struct net_bridge_mcast_gc *gcent; 300 struct hlist_node *tmp; 301 302 hlist_for_each_entry_safe(gcent, tmp, head, gc_node) { 303 hlist_del_init(&gcent->gc_node); 304 gcent->destroy(gcent); 305 } 306 } 307 308 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, 309 struct net_bridge_port_group *pg, 310 __be32 ip_dst, __be32 group, 311 bool with_srcs, bool over_lmqt, 312 u8 sflag, u8 *igmp_type, 313 bool *need_rexmit) 314 { 315 struct net_bridge_port *p = pg ? pg->port : NULL; 316 struct net_bridge_group_src *ent; 317 size_t pkt_size, igmp_hdr_size; 318 unsigned long now = jiffies; 319 struct igmpv3_query *ihv3; 320 void *csum_start = NULL; 321 __sum16 *csum = NULL; 322 struct sk_buff *skb; 323 struct igmphdr *ih; 324 struct ethhdr *eth; 325 unsigned long lmqt; 326 struct iphdr *iph; 327 u16 lmqt_srcs = 0; 328 329 igmp_hdr_size = sizeof(*ih); 330 if (br->multicast_igmp_version == 3) { 331 igmp_hdr_size = sizeof(*ihv3); 332 if (pg && with_srcs) { 333 lmqt = now + (br->multicast_last_member_interval * 334 br->multicast_last_member_count); 335 hlist_for_each_entry(ent, &pg->src_list, node) { 336 if (over_lmqt == time_after(ent->timer.expires, 337 lmqt) && 338 ent->src_query_rexmit_cnt > 0) 339 lmqt_srcs++; 340 } 341 342 if (!lmqt_srcs) 343 return NULL; 344 igmp_hdr_size += lmqt_srcs * sizeof(__be32); 345 } 346 } 347 348 pkt_size = sizeof(*eth) + sizeof(*iph) + 4 + igmp_hdr_size; 349 if ((p && pkt_size > p->dev->mtu) || 350 pkt_size > br->dev->mtu) 351 return NULL; 352 353 skb = netdev_alloc_skb_ip_align(br->dev, pkt_size); 354 if (!skb) 355 goto out; 356 357 skb->protocol = htons(ETH_P_IP); 358 359 skb_reset_mac_header(skb); 360 eth = eth_hdr(skb); 361 362 ether_addr_copy(eth->h_source, br->dev->dev_addr); 363 ip_eth_mc_map(ip_dst, eth->h_dest); 364 eth->h_proto = htons(ETH_P_IP); 365 skb_put(skb, sizeof(*eth)); 366 367 skb_set_network_header(skb, skb->len); 368 iph = ip_hdr(skb); 369 iph->tot_len = htons(pkt_size - sizeof(*eth)); 370 371 iph->version = 4; 372 iph->ihl = 6; 373 iph->tos = 0xc0; 374 iph->id = 0; 375 iph->frag_off = htons(IP_DF); 376 iph->ttl = 1; 377 iph->protocol = IPPROTO_IGMP; 378 iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ? 379 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0; 380 iph->daddr = ip_dst; 381 ((u8 *)&iph[1])[0] = IPOPT_RA; 382 ((u8 *)&iph[1])[1] = 4; 383 ((u8 *)&iph[1])[2] = 0; 384 ((u8 *)&iph[1])[3] = 0; 385 ip_send_check(iph); 386 skb_put(skb, 24); 387 388 skb_set_transport_header(skb, skb->len); 389 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY; 390 391 switch (br->multicast_igmp_version) { 392 case 2: 393 ih = igmp_hdr(skb); 394 ih->type = IGMP_HOST_MEMBERSHIP_QUERY; 395 ih->code = (group ? br->multicast_last_member_interval : 396 br->multicast_query_response_interval) / 397 (HZ / IGMP_TIMER_SCALE); 398 ih->group = group; 399 ih->csum = 0; 400 csum = &ih->csum; 401 csum_start = (void *)ih; 402 break; 403 case 3: 404 ihv3 = igmpv3_query_hdr(skb); 405 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY; 406 ihv3->code = (group ? br->multicast_last_member_interval : 407 br->multicast_query_response_interval) / 408 (HZ / IGMP_TIMER_SCALE); 409 ihv3->group = group; 410 ihv3->qqic = br->multicast_query_interval / HZ; 411 ihv3->nsrcs = htons(lmqt_srcs); 412 ihv3->resv = 0; 413 ihv3->suppress = sflag; 414 ihv3->qrv = 2; 415 ihv3->csum = 0; 416 csum = &ihv3->csum; 417 csum_start = (void *)ihv3; 418 if (!pg || !with_srcs) 419 break; 420 421 lmqt_srcs = 0; 422 hlist_for_each_entry(ent, &pg->src_list, node) { 423 if (over_lmqt == time_after(ent->timer.expires, 424 lmqt) && 425 ent->src_query_rexmit_cnt > 0) { 426 ihv3->srcs[lmqt_srcs++] = ent->addr.u.ip4; 427 ent->src_query_rexmit_cnt--; 428 if (need_rexmit && ent->src_query_rexmit_cnt) 429 *need_rexmit = true; 430 } 431 } 432 if (WARN_ON(lmqt_srcs != ntohs(ihv3->nsrcs))) { 433 kfree_skb(skb); 434 return NULL; 435 } 436 break; 437 } 438 439 if (WARN_ON(!csum || !csum_start)) { 440 kfree_skb(skb); 441 return NULL; 442 } 443 444 *csum = ip_compute_csum(csum_start, igmp_hdr_size); 445 skb_put(skb, igmp_hdr_size); 446 __skb_pull(skb, sizeof(*eth)); 447 448 out: 449 return skb; 450 } 451 452 #if IS_ENABLED(CONFIG_IPV6) 453 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, 454 struct net_bridge_port_group *pg, 455 const struct in6_addr *ip6_dst, 456 const struct in6_addr *group, 457 bool with_srcs, bool over_llqt, 458 u8 sflag, u8 *igmp_type, 459 bool *need_rexmit) 460 { 461 struct net_bridge_port *p = pg ? pg->port : NULL; 462 struct net_bridge_group_src *ent; 463 size_t pkt_size, mld_hdr_size; 464 unsigned long now = jiffies; 465 struct mld2_query *mld2q; 466 void *csum_start = NULL; 467 unsigned long interval; 468 __sum16 *csum = NULL; 469 struct ipv6hdr *ip6h; 470 struct mld_msg *mldq; 471 struct sk_buff *skb; 472 unsigned long llqt; 473 struct ethhdr *eth; 474 u16 llqt_srcs = 0; 475 u8 *hopopt; 476 477 mld_hdr_size = sizeof(*mldq); 478 if (br->multicast_mld_version == 2) { 479 mld_hdr_size = sizeof(*mld2q); 480 if (pg && with_srcs) { 481 llqt = now + (br->multicast_last_member_interval * 482 br->multicast_last_member_count); 483 hlist_for_each_entry(ent, &pg->src_list, node) { 484 if (over_llqt == time_after(ent->timer.expires, 485 llqt) && 486 ent->src_query_rexmit_cnt > 0) 487 llqt_srcs++; 488 } 489 490 if (!llqt_srcs) 491 return NULL; 492 mld_hdr_size += llqt_srcs * sizeof(struct in6_addr); 493 } 494 } 495 496 pkt_size = sizeof(*eth) + sizeof(*ip6h) + 8 + mld_hdr_size; 497 if ((p && pkt_size > p->dev->mtu) || 498 pkt_size > br->dev->mtu) 499 return NULL; 500 501 skb = netdev_alloc_skb_ip_align(br->dev, pkt_size); 502 if (!skb) 503 goto out; 504 505 skb->protocol = htons(ETH_P_IPV6); 506 507 /* Ethernet header */ 508 skb_reset_mac_header(skb); 509 eth = eth_hdr(skb); 510 511 ether_addr_copy(eth->h_source, br->dev->dev_addr); 512 eth->h_proto = htons(ETH_P_IPV6); 513 skb_put(skb, sizeof(*eth)); 514 515 /* IPv6 header + HbH option */ 516 skb_set_network_header(skb, skb->len); 517 ip6h = ipv6_hdr(skb); 518 519 *(__force __be32 *)ip6h = htonl(0x60000000); 520 ip6h->payload_len = htons(8 + mld_hdr_size); 521 ip6h->nexthdr = IPPROTO_HOPOPTS; 522 ip6h->hop_limit = 1; 523 ip6h->daddr = *ip6_dst; 524 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, 525 &ip6h->saddr)) { 526 kfree_skb(skb); 527 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false); 528 return NULL; 529 } 530 531 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true); 532 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 533 534 hopopt = (u8 *)(ip6h + 1); 535 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ 536 hopopt[1] = 0; /* length of HbH */ 537 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ 538 hopopt[3] = 2; /* Length of RA Option */ 539 hopopt[4] = 0; /* Type = 0x0000 (MLD) */ 540 hopopt[5] = 0; 541 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ 542 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ 543 544 skb_put(skb, sizeof(*ip6h) + 8); 545 546 /* ICMPv6 */ 547 skb_set_transport_header(skb, skb->len); 548 interval = ipv6_addr_any(group) ? 549 br->multicast_query_response_interval : 550 br->multicast_last_member_interval; 551 *igmp_type = ICMPV6_MGM_QUERY; 552 switch (br->multicast_mld_version) { 553 case 1: 554 mldq = (struct mld_msg *)icmp6_hdr(skb); 555 mldq->mld_type = ICMPV6_MGM_QUERY; 556 mldq->mld_code = 0; 557 mldq->mld_cksum = 0; 558 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); 559 mldq->mld_reserved = 0; 560 mldq->mld_mca = *group; 561 csum = &mldq->mld_cksum; 562 csum_start = (void *)mldq; 563 break; 564 case 2: 565 mld2q = (struct mld2_query *)icmp6_hdr(skb); 566 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval)); 567 mld2q->mld2q_type = ICMPV6_MGM_QUERY; 568 mld2q->mld2q_code = 0; 569 mld2q->mld2q_cksum = 0; 570 mld2q->mld2q_resv1 = 0; 571 mld2q->mld2q_resv2 = 0; 572 mld2q->mld2q_suppress = sflag; 573 mld2q->mld2q_qrv = 2; 574 mld2q->mld2q_nsrcs = htons(llqt_srcs); 575 mld2q->mld2q_qqic = br->multicast_query_interval / HZ; 576 mld2q->mld2q_mca = *group; 577 csum = &mld2q->mld2q_cksum; 578 csum_start = (void *)mld2q; 579 if (!pg || !with_srcs) 580 break; 581 582 llqt_srcs = 0; 583 hlist_for_each_entry(ent, &pg->src_list, node) { 584 if (over_llqt == time_after(ent->timer.expires, 585 llqt) && 586 ent->src_query_rexmit_cnt > 0) { 587 mld2q->mld2q_srcs[llqt_srcs++] = ent->addr.u.ip6; 588 ent->src_query_rexmit_cnt--; 589 if (need_rexmit && ent->src_query_rexmit_cnt) 590 *need_rexmit = true; 591 } 592 } 593 if (WARN_ON(llqt_srcs != ntohs(mld2q->mld2q_nsrcs))) { 594 kfree_skb(skb); 595 return NULL; 596 } 597 break; 598 } 599 600 if (WARN_ON(!csum || !csum_start)) { 601 kfree_skb(skb); 602 return NULL; 603 } 604 605 *csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, mld_hdr_size, 606 IPPROTO_ICMPV6, 607 csum_partial(csum_start, mld_hdr_size, 0)); 608 skb_put(skb, mld_hdr_size); 609 __skb_pull(skb, sizeof(*eth)); 610 611 out: 612 return skb; 613 } 614 #endif 615 616 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, 617 struct net_bridge_port_group *pg, 618 struct br_ip *ip_dst, 619 struct br_ip *group, 620 bool with_srcs, bool over_lmqt, 621 u8 sflag, u8 *igmp_type, 622 bool *need_rexmit) 623 { 624 __be32 ip4_dst; 625 626 switch (group->proto) { 627 case htons(ETH_P_IP): 628 ip4_dst = ip_dst ? ip_dst->u.ip4 : htonl(INADDR_ALLHOSTS_GROUP); 629 return br_ip4_multicast_alloc_query(br, pg, 630 ip4_dst, group->u.ip4, 631 with_srcs, over_lmqt, 632 sflag, igmp_type, 633 need_rexmit); 634 #if IS_ENABLED(CONFIG_IPV6) 635 case htons(ETH_P_IPV6): { 636 struct in6_addr ip6_dst; 637 638 if (ip_dst) 639 ip6_dst = ip_dst->u.ip6; 640 else 641 ipv6_addr_set(&ip6_dst, htonl(0xff020000), 0, 0, 642 htonl(1)); 643 644 return br_ip6_multicast_alloc_query(br, pg, 645 &ip6_dst, &group->u.ip6, 646 with_srcs, over_lmqt, 647 sflag, igmp_type, 648 need_rexmit); 649 } 650 #endif 651 } 652 return NULL; 653 } 654 655 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, 656 struct br_ip *group) 657 { 658 struct net_bridge_mdb_entry *mp; 659 int err; 660 661 mp = br_mdb_ip_get(br, group); 662 if (mp) 663 return mp; 664 665 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) { 666 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false); 667 return ERR_PTR(-E2BIG); 668 } 669 670 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 671 if (unlikely(!mp)) 672 return ERR_PTR(-ENOMEM); 673 674 mp->br = br; 675 mp->addr = *group; 676 mp->mcast_gc.destroy = br_multicast_destroy_mdb_entry; 677 timer_setup(&mp->timer, br_multicast_group_expired, 0); 678 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode, 679 br_mdb_rht_params); 680 if (err) { 681 kfree(mp); 682 mp = ERR_PTR(err); 683 } else { 684 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list); 685 } 686 687 return mp; 688 } 689 690 static void br_multicast_group_src_expired(struct timer_list *t) 691 { 692 struct net_bridge_group_src *src = from_timer(src, t, timer); 693 struct net_bridge_port_group *pg; 694 struct net_bridge *br = src->br; 695 696 spin_lock(&br->multicast_lock); 697 if (hlist_unhashed(&src->node) || !netif_running(br->dev) || 698 timer_pending(&src->timer)) 699 goto out; 700 701 pg = src->pg; 702 if (pg->filter_mode == MCAST_INCLUDE) { 703 br_multicast_del_group_src(src); 704 if (!hlist_empty(&pg->src_list)) 705 goto out; 706 br_multicast_find_del_pg(br, pg); 707 } 708 out: 709 spin_unlock(&br->multicast_lock); 710 } 711 712 static struct net_bridge_group_src * 713 br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip) 714 { 715 struct net_bridge_group_src *ent; 716 717 switch (ip->proto) { 718 case htons(ETH_P_IP): 719 hlist_for_each_entry(ent, &pg->src_list, node) 720 if (ip->u.ip4 == ent->addr.u.ip4) 721 return ent; 722 break; 723 #if IS_ENABLED(CONFIG_IPV6) 724 case htons(ETH_P_IPV6): 725 hlist_for_each_entry(ent, &pg->src_list, node) 726 if (!ipv6_addr_cmp(&ent->addr.u.ip6, &ip->u.ip6)) 727 return ent; 728 break; 729 #endif 730 } 731 732 return NULL; 733 } 734 735 static struct net_bridge_group_src * 736 br_multicast_new_group_src(struct net_bridge_port_group *pg, struct br_ip *src_ip) 737 { 738 struct net_bridge_group_src *grp_src; 739 740 if (unlikely(pg->src_ents >= PG_SRC_ENT_LIMIT)) 741 return NULL; 742 743 switch (src_ip->proto) { 744 case htons(ETH_P_IP): 745 if (ipv4_is_zeronet(src_ip->u.ip4) || 746 ipv4_is_multicast(src_ip->u.ip4)) 747 return NULL; 748 break; 749 #if IS_ENABLED(CONFIG_IPV6) 750 case htons(ETH_P_IPV6): 751 if (ipv6_addr_any(&src_ip->u.ip6) || 752 ipv6_addr_is_multicast(&src_ip->u.ip6)) 753 return NULL; 754 break; 755 #endif 756 } 757 758 grp_src = kzalloc(sizeof(*grp_src), GFP_ATOMIC); 759 if (unlikely(!grp_src)) 760 return NULL; 761 762 grp_src->pg = pg; 763 grp_src->br = pg->port->br; 764 grp_src->addr = *src_ip; 765 grp_src->mcast_gc.destroy = br_multicast_destroy_group_src; 766 timer_setup(&grp_src->timer, br_multicast_group_src_expired, 0); 767 768 hlist_add_head_rcu(&grp_src->node, &pg->src_list); 769 pg->src_ents++; 770 771 return grp_src; 772 } 773 774 struct net_bridge_port_group *br_multicast_new_port_group( 775 struct net_bridge_port *port, 776 struct br_ip *group, 777 struct net_bridge_port_group __rcu *next, 778 unsigned char flags, 779 const unsigned char *src, 780 u8 filter_mode) 781 { 782 struct net_bridge_port_group *p; 783 784 p = kzalloc(sizeof(*p), GFP_ATOMIC); 785 if (unlikely(!p)) 786 return NULL; 787 788 p->addr = *group; 789 p->port = port; 790 p->flags = flags; 791 p->filter_mode = filter_mode; 792 p->mcast_gc.destroy = br_multicast_destroy_port_group; 793 INIT_HLIST_HEAD(&p->src_list); 794 rcu_assign_pointer(p->next, next); 795 timer_setup(&p->timer, br_multicast_port_group_expired, 0); 796 timer_setup(&p->rexmit_timer, br_multicast_port_group_rexmit, 0); 797 hlist_add_head(&p->mglist, &port->mglist); 798 799 if (src) 800 memcpy(p->eth_addr, src, ETH_ALEN); 801 else 802 eth_broadcast_addr(p->eth_addr); 803 804 return p; 805 } 806 807 static bool br_port_group_equal(struct net_bridge_port_group *p, 808 struct net_bridge_port *port, 809 const unsigned char *src) 810 { 811 if (p->port != port) 812 return false; 813 814 if (!(port->flags & BR_MULTICAST_TO_UNICAST)) 815 return true; 816 817 return ether_addr_equal(src, p->eth_addr); 818 } 819 820 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify) 821 { 822 if (!mp->host_joined) { 823 mp->host_joined = true; 824 if (notify) 825 br_mdb_notify(mp->br->dev, mp, NULL, RTM_NEWMDB); 826 } 827 mod_timer(&mp->timer, jiffies + mp->br->multicast_membership_interval); 828 } 829 830 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify) 831 { 832 if (!mp->host_joined) 833 return; 834 835 mp->host_joined = false; 836 if (notify) 837 br_mdb_notify(mp->br->dev, mp, NULL, RTM_DELMDB); 838 } 839 840 static int br_multicast_add_group(struct net_bridge *br, 841 struct net_bridge_port *port, 842 struct br_ip *group, 843 const unsigned char *src, 844 u8 filter_mode, 845 bool igmpv2_mldv1) 846 { 847 struct net_bridge_port_group __rcu **pp; 848 struct net_bridge_port_group *p; 849 struct net_bridge_mdb_entry *mp; 850 unsigned long now = jiffies; 851 int err; 852 853 spin_lock(&br->multicast_lock); 854 if (!netif_running(br->dev) || 855 (port && port->state == BR_STATE_DISABLED)) 856 goto out; 857 858 mp = br_multicast_new_group(br, group); 859 err = PTR_ERR(mp); 860 if (IS_ERR(mp)) 861 goto err; 862 863 if (!port) { 864 br_multicast_host_join(mp, true); 865 goto out; 866 } 867 868 for (pp = &mp->ports; 869 (p = mlock_dereference(*pp, br)) != NULL; 870 pp = &p->next) { 871 if (br_port_group_equal(p, port, src)) 872 goto found; 873 if ((unsigned long)p->port < (unsigned long)port) 874 break; 875 } 876 877 p = br_multicast_new_port_group(port, group, *pp, 0, src, filter_mode); 878 if (unlikely(!p)) 879 goto err; 880 rcu_assign_pointer(*pp, p); 881 br_mdb_notify(br->dev, mp, p, RTM_NEWMDB); 882 883 found: 884 if (igmpv2_mldv1) 885 mod_timer(&p->timer, now + br->multicast_membership_interval); 886 887 out: 888 err = 0; 889 890 err: 891 spin_unlock(&br->multicast_lock); 892 return err; 893 } 894 895 static int br_ip4_multicast_add_group(struct net_bridge *br, 896 struct net_bridge_port *port, 897 __be32 group, 898 __u16 vid, 899 const unsigned char *src, 900 bool igmpv2) 901 { 902 struct br_ip br_group; 903 u8 filter_mode; 904 905 if (ipv4_is_local_multicast(group)) 906 return 0; 907 908 memset(&br_group, 0, sizeof(br_group)); 909 br_group.u.ip4 = group; 910 br_group.proto = htons(ETH_P_IP); 911 br_group.vid = vid; 912 filter_mode = igmpv2 ? MCAST_EXCLUDE : MCAST_INCLUDE; 913 914 return br_multicast_add_group(br, port, &br_group, src, filter_mode, 915 igmpv2); 916 } 917 918 #if IS_ENABLED(CONFIG_IPV6) 919 static int br_ip6_multicast_add_group(struct net_bridge *br, 920 struct net_bridge_port *port, 921 const struct in6_addr *group, 922 __u16 vid, 923 const unsigned char *src, 924 bool mldv1) 925 { 926 struct br_ip br_group; 927 u8 filter_mode; 928 929 if (ipv6_addr_is_ll_all_nodes(group)) 930 return 0; 931 932 memset(&br_group, 0, sizeof(br_group)); 933 br_group.u.ip6 = *group; 934 br_group.proto = htons(ETH_P_IPV6); 935 br_group.vid = vid; 936 filter_mode = mldv1 ? MCAST_EXCLUDE : MCAST_INCLUDE; 937 938 return br_multicast_add_group(br, port, &br_group, src, filter_mode, 939 mldv1); 940 } 941 #endif 942 943 static void br_multicast_router_expired(struct timer_list *t) 944 { 945 struct net_bridge_port *port = 946 from_timer(port, t, multicast_router_timer); 947 struct net_bridge *br = port->br; 948 949 spin_lock(&br->multicast_lock); 950 if (port->multicast_router == MDB_RTR_TYPE_DISABLED || 951 port->multicast_router == MDB_RTR_TYPE_PERM || 952 timer_pending(&port->multicast_router_timer)) 953 goto out; 954 955 __del_port_router(port); 956 out: 957 spin_unlock(&br->multicast_lock); 958 } 959 960 static void br_mc_router_state_change(struct net_bridge *p, 961 bool is_mc_router) 962 { 963 struct switchdev_attr attr = { 964 .orig_dev = p->dev, 965 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER, 966 .flags = SWITCHDEV_F_DEFER, 967 .u.mrouter = is_mc_router, 968 }; 969 970 switchdev_port_attr_set(p->dev, &attr); 971 } 972 973 static void br_multicast_local_router_expired(struct timer_list *t) 974 { 975 struct net_bridge *br = from_timer(br, t, multicast_router_timer); 976 977 spin_lock(&br->multicast_lock); 978 if (br->multicast_router == MDB_RTR_TYPE_DISABLED || 979 br->multicast_router == MDB_RTR_TYPE_PERM || 980 timer_pending(&br->multicast_router_timer)) 981 goto out; 982 983 br_mc_router_state_change(br, false); 984 out: 985 spin_unlock(&br->multicast_lock); 986 } 987 988 static void br_multicast_querier_expired(struct net_bridge *br, 989 struct bridge_mcast_own_query *query) 990 { 991 spin_lock(&br->multicast_lock); 992 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED)) 993 goto out; 994 995 br_multicast_start_querier(br, query); 996 997 out: 998 spin_unlock(&br->multicast_lock); 999 } 1000 1001 static void br_ip4_multicast_querier_expired(struct timer_list *t) 1002 { 1003 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer); 1004 1005 br_multicast_querier_expired(br, &br->ip4_own_query); 1006 } 1007 1008 #if IS_ENABLED(CONFIG_IPV6) 1009 static void br_ip6_multicast_querier_expired(struct timer_list *t) 1010 { 1011 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer); 1012 1013 br_multicast_querier_expired(br, &br->ip6_own_query); 1014 } 1015 #endif 1016 1017 static void br_multicast_select_own_querier(struct net_bridge *br, 1018 struct br_ip *ip, 1019 struct sk_buff *skb) 1020 { 1021 if (ip->proto == htons(ETH_P_IP)) 1022 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr; 1023 #if IS_ENABLED(CONFIG_IPV6) 1024 else 1025 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr; 1026 #endif 1027 } 1028 1029 static void __br_multicast_send_query(struct net_bridge *br, 1030 struct net_bridge_port *port, 1031 struct net_bridge_port_group *pg, 1032 struct br_ip *ip_dst, 1033 struct br_ip *group, 1034 bool with_srcs, 1035 u8 sflag, 1036 bool *need_rexmit) 1037 { 1038 bool over_lmqt = !!sflag; 1039 struct sk_buff *skb; 1040 u8 igmp_type; 1041 1042 again_under_lmqt: 1043 skb = br_multicast_alloc_query(br, pg, ip_dst, group, with_srcs, 1044 over_lmqt, sflag, &igmp_type, 1045 need_rexmit); 1046 if (!skb) 1047 return; 1048 1049 if (port) { 1050 skb->dev = port->dev; 1051 br_multicast_count(br, port, skb, igmp_type, 1052 BR_MCAST_DIR_TX); 1053 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, 1054 dev_net(port->dev), NULL, skb, NULL, skb->dev, 1055 br_dev_queue_push_xmit); 1056 1057 if (over_lmqt && with_srcs && sflag) { 1058 over_lmqt = false; 1059 goto again_under_lmqt; 1060 } 1061 } else { 1062 br_multicast_select_own_querier(br, group, skb); 1063 br_multicast_count(br, port, skb, igmp_type, 1064 BR_MCAST_DIR_RX); 1065 netif_rx(skb); 1066 } 1067 } 1068 1069 static void br_multicast_send_query(struct net_bridge *br, 1070 struct net_bridge_port *port, 1071 struct bridge_mcast_own_query *own_query) 1072 { 1073 struct bridge_mcast_other_query *other_query = NULL; 1074 struct br_ip br_group; 1075 unsigned long time; 1076 1077 if (!netif_running(br->dev) || 1078 !br_opt_get(br, BROPT_MULTICAST_ENABLED) || 1079 !br_opt_get(br, BROPT_MULTICAST_QUERIER)) 1080 return; 1081 1082 memset(&br_group.u, 0, sizeof(br_group.u)); 1083 1084 if (port ? (own_query == &port->ip4_own_query) : 1085 (own_query == &br->ip4_own_query)) { 1086 other_query = &br->ip4_other_query; 1087 br_group.proto = htons(ETH_P_IP); 1088 #if IS_ENABLED(CONFIG_IPV6) 1089 } else { 1090 other_query = &br->ip6_other_query; 1091 br_group.proto = htons(ETH_P_IPV6); 1092 #endif 1093 } 1094 1095 if (!other_query || timer_pending(&other_query->timer)) 1096 return; 1097 1098 __br_multicast_send_query(br, port, NULL, NULL, &br_group, false, 0, 1099 NULL); 1100 1101 time = jiffies; 1102 time += own_query->startup_sent < br->multicast_startup_query_count ? 1103 br->multicast_startup_query_interval : 1104 br->multicast_query_interval; 1105 mod_timer(&own_query->timer, time); 1106 } 1107 1108 static void 1109 br_multicast_port_query_expired(struct net_bridge_port *port, 1110 struct bridge_mcast_own_query *query) 1111 { 1112 struct net_bridge *br = port->br; 1113 1114 spin_lock(&br->multicast_lock); 1115 if (port->state == BR_STATE_DISABLED || 1116 port->state == BR_STATE_BLOCKING) 1117 goto out; 1118 1119 if (query->startup_sent < br->multicast_startup_query_count) 1120 query->startup_sent++; 1121 1122 br_multicast_send_query(port->br, port, query); 1123 1124 out: 1125 spin_unlock(&br->multicast_lock); 1126 } 1127 1128 static void br_ip4_multicast_port_query_expired(struct timer_list *t) 1129 { 1130 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer); 1131 1132 br_multicast_port_query_expired(port, &port->ip4_own_query); 1133 } 1134 1135 #if IS_ENABLED(CONFIG_IPV6) 1136 static void br_ip6_multicast_port_query_expired(struct timer_list *t) 1137 { 1138 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer); 1139 1140 br_multicast_port_query_expired(port, &port->ip6_own_query); 1141 } 1142 #endif 1143 1144 static void br_multicast_port_group_rexmit(struct timer_list *t) 1145 { 1146 struct net_bridge_port_group *pg = from_timer(pg, t, rexmit_timer); 1147 struct bridge_mcast_other_query *other_query = NULL; 1148 struct net_bridge *br = pg->port->br; 1149 bool need_rexmit = false; 1150 1151 spin_lock(&br->multicast_lock); 1152 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) || 1153 !br_opt_get(br, BROPT_MULTICAST_ENABLED) || 1154 !br_opt_get(br, BROPT_MULTICAST_QUERIER)) 1155 goto out; 1156 1157 if (pg->addr.proto == htons(ETH_P_IP)) 1158 other_query = &br->ip4_other_query; 1159 #if IS_ENABLED(CONFIG_IPV6) 1160 else 1161 other_query = &br->ip6_other_query; 1162 #endif 1163 1164 if (!other_query || timer_pending(&other_query->timer)) 1165 goto out; 1166 1167 if (pg->grp_query_rexmit_cnt) { 1168 pg->grp_query_rexmit_cnt--; 1169 __br_multicast_send_query(br, pg->port, pg, &pg->addr, 1170 &pg->addr, false, 1, NULL); 1171 } 1172 __br_multicast_send_query(br, pg->port, pg, &pg->addr, 1173 &pg->addr, true, 0, &need_rexmit); 1174 1175 if (pg->grp_query_rexmit_cnt || need_rexmit) 1176 mod_timer(&pg->rexmit_timer, jiffies + 1177 br->multicast_last_member_interval); 1178 out: 1179 spin_unlock(&br->multicast_lock); 1180 } 1181 1182 static void br_mc_disabled_update(struct net_device *dev, bool value) 1183 { 1184 struct switchdev_attr attr = { 1185 .orig_dev = dev, 1186 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED, 1187 .flags = SWITCHDEV_F_DEFER, 1188 .u.mc_disabled = !value, 1189 }; 1190 1191 switchdev_port_attr_set(dev, &attr); 1192 } 1193 1194 int br_multicast_add_port(struct net_bridge_port *port) 1195 { 1196 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1197 1198 timer_setup(&port->multicast_router_timer, 1199 br_multicast_router_expired, 0); 1200 timer_setup(&port->ip4_own_query.timer, 1201 br_ip4_multicast_port_query_expired, 0); 1202 #if IS_ENABLED(CONFIG_IPV6) 1203 timer_setup(&port->ip6_own_query.timer, 1204 br_ip6_multicast_port_query_expired, 0); 1205 #endif 1206 br_mc_disabled_update(port->dev, 1207 br_opt_get(port->br, BROPT_MULTICAST_ENABLED)); 1208 1209 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 1210 if (!port->mcast_stats) 1211 return -ENOMEM; 1212 1213 return 0; 1214 } 1215 1216 void br_multicast_del_port(struct net_bridge_port *port) 1217 { 1218 struct net_bridge *br = port->br; 1219 struct net_bridge_port_group *pg; 1220 HLIST_HEAD(deleted_head); 1221 struct hlist_node *n; 1222 1223 /* Take care of the remaining groups, only perm ones should be left */ 1224 spin_lock_bh(&br->multicast_lock); 1225 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 1226 br_multicast_find_del_pg(br, pg); 1227 hlist_move_list(&br->mcast_gc_list, &deleted_head); 1228 spin_unlock_bh(&br->multicast_lock); 1229 br_multicast_gc(&deleted_head); 1230 del_timer_sync(&port->multicast_router_timer); 1231 free_percpu(port->mcast_stats); 1232 } 1233 1234 static void br_multicast_enable(struct bridge_mcast_own_query *query) 1235 { 1236 query->startup_sent = 0; 1237 1238 if (try_to_del_timer_sync(&query->timer) >= 0 || 1239 del_timer(&query->timer)) 1240 mod_timer(&query->timer, jiffies); 1241 } 1242 1243 static void __br_multicast_enable_port(struct net_bridge_port *port) 1244 { 1245 struct net_bridge *br = port->br; 1246 1247 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev)) 1248 return; 1249 1250 br_multicast_enable(&port->ip4_own_query); 1251 #if IS_ENABLED(CONFIG_IPV6) 1252 br_multicast_enable(&port->ip6_own_query); 1253 #endif 1254 if (port->multicast_router == MDB_RTR_TYPE_PERM && 1255 hlist_unhashed(&port->rlist)) 1256 br_multicast_add_router(br, port); 1257 } 1258 1259 void br_multicast_enable_port(struct net_bridge_port *port) 1260 { 1261 struct net_bridge *br = port->br; 1262 1263 spin_lock(&br->multicast_lock); 1264 __br_multicast_enable_port(port); 1265 spin_unlock(&br->multicast_lock); 1266 } 1267 1268 void br_multicast_disable_port(struct net_bridge_port *port) 1269 { 1270 struct net_bridge *br = port->br; 1271 struct net_bridge_port_group *pg; 1272 struct hlist_node *n; 1273 1274 spin_lock(&br->multicast_lock); 1275 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 1276 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT)) 1277 br_multicast_find_del_pg(br, pg); 1278 1279 __del_port_router(port); 1280 1281 del_timer(&port->multicast_router_timer); 1282 del_timer(&port->ip4_own_query.timer); 1283 #if IS_ENABLED(CONFIG_IPV6) 1284 del_timer(&port->ip6_own_query.timer); 1285 #endif 1286 spin_unlock(&br->multicast_lock); 1287 } 1288 1289 static int __grp_src_delete_marked(struct net_bridge_port_group *pg) 1290 { 1291 struct net_bridge_group_src *ent; 1292 struct hlist_node *tmp; 1293 int deleted = 0; 1294 1295 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) 1296 if (ent->flags & BR_SGRP_F_DELETE) { 1297 br_multicast_del_group_src(ent); 1298 deleted++; 1299 } 1300 1301 return deleted; 1302 } 1303 1304 static void __grp_src_query_marked_and_rexmit(struct net_bridge_port_group *pg) 1305 { 1306 struct bridge_mcast_other_query *other_query = NULL; 1307 struct net_bridge *br = pg->port->br; 1308 u32 lmqc = br->multicast_last_member_count; 1309 unsigned long lmqt, lmi, now = jiffies; 1310 struct net_bridge_group_src *ent; 1311 1312 if (!netif_running(br->dev) || 1313 !br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1314 return; 1315 1316 if (pg->addr.proto == htons(ETH_P_IP)) 1317 other_query = &br->ip4_other_query; 1318 #if IS_ENABLED(CONFIG_IPV6) 1319 else 1320 other_query = &br->ip6_other_query; 1321 #endif 1322 1323 lmqt = now + br_multicast_lmqt(br); 1324 hlist_for_each_entry(ent, &pg->src_list, node) { 1325 if (ent->flags & BR_SGRP_F_SEND) { 1326 ent->flags &= ~BR_SGRP_F_SEND; 1327 if (ent->timer.expires > lmqt) { 1328 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) && 1329 other_query && 1330 !timer_pending(&other_query->timer)) 1331 ent->src_query_rexmit_cnt = lmqc; 1332 mod_timer(&ent->timer, lmqt); 1333 } 1334 } 1335 } 1336 1337 if (!br_opt_get(br, BROPT_MULTICAST_QUERIER) || 1338 !other_query || timer_pending(&other_query->timer)) 1339 return; 1340 1341 __br_multicast_send_query(br, pg->port, pg, &pg->addr, 1342 &pg->addr, true, 1, NULL); 1343 1344 lmi = now + br->multicast_last_member_interval; 1345 if (!timer_pending(&pg->rexmit_timer) || 1346 time_after(pg->rexmit_timer.expires, lmi)) 1347 mod_timer(&pg->rexmit_timer, lmi); 1348 } 1349 1350 static void __grp_send_query_and_rexmit(struct net_bridge_port_group *pg) 1351 { 1352 struct bridge_mcast_other_query *other_query = NULL; 1353 struct net_bridge *br = pg->port->br; 1354 unsigned long now = jiffies, lmi; 1355 1356 if (!netif_running(br->dev) || 1357 !br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1358 return; 1359 1360 if (pg->addr.proto == htons(ETH_P_IP)) 1361 other_query = &br->ip4_other_query; 1362 #if IS_ENABLED(CONFIG_IPV6) 1363 else 1364 other_query = &br->ip6_other_query; 1365 #endif 1366 1367 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) && 1368 other_query && !timer_pending(&other_query->timer)) { 1369 lmi = now + br->multicast_last_member_interval; 1370 pg->grp_query_rexmit_cnt = br->multicast_last_member_count - 1; 1371 __br_multicast_send_query(br, pg->port, pg, &pg->addr, 1372 &pg->addr, false, 0, NULL); 1373 if (!timer_pending(&pg->rexmit_timer) || 1374 time_after(pg->rexmit_timer.expires, lmi)) 1375 mod_timer(&pg->rexmit_timer, lmi); 1376 } 1377 1378 if (pg->filter_mode == MCAST_EXCLUDE && 1379 (!timer_pending(&pg->timer) || 1380 time_after(pg->timer.expires, now + br_multicast_lmqt(br)))) 1381 mod_timer(&pg->timer, now + br_multicast_lmqt(br)); 1382 } 1383 1384 /* State Msg type New state Actions 1385 * INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI 1386 * INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI 1387 * EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI 1388 */ 1389 static bool br_multicast_isinc_allow(struct net_bridge_port_group *pg, 1390 void *srcs, u32 nsrcs, size_t src_size) 1391 { 1392 struct net_bridge *br = pg->port->br; 1393 struct net_bridge_group_src *ent; 1394 unsigned long now = jiffies; 1395 bool changed = false; 1396 struct br_ip src_ip; 1397 u32 src_idx; 1398 1399 memset(&src_ip, 0, sizeof(src_ip)); 1400 src_ip.proto = pg->addr.proto; 1401 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 1402 memcpy(&src_ip.u, srcs, src_size); 1403 ent = br_multicast_find_group_src(pg, &src_ip); 1404 if (!ent) { 1405 ent = br_multicast_new_group_src(pg, &src_ip); 1406 if (ent) 1407 changed = true; 1408 } 1409 1410 if (ent) 1411 mod_timer(&ent->timer, now + br_multicast_gmi(br)); 1412 srcs += src_size; 1413 } 1414 1415 return changed; 1416 } 1417 1418 /* State Msg type New state Actions 1419 * INCLUDE (A) IS_EX (B) EXCLUDE (A*B,B-A) (B-A)=0 1420 * Delete (A-B) 1421 * Group Timer=GMI 1422 */ 1423 static void __grp_src_isexc_incl(struct net_bridge_port_group *pg, 1424 void *srcs, u32 nsrcs, size_t src_size) 1425 { 1426 struct net_bridge_group_src *ent; 1427 struct br_ip src_ip; 1428 u32 src_idx; 1429 1430 hlist_for_each_entry(ent, &pg->src_list, node) 1431 ent->flags |= BR_SGRP_F_DELETE; 1432 1433 memset(&src_ip, 0, sizeof(src_ip)); 1434 src_ip.proto = pg->addr.proto; 1435 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 1436 memcpy(&src_ip.u, srcs, src_size); 1437 ent = br_multicast_find_group_src(pg, &src_ip); 1438 if (ent) 1439 ent->flags &= ~BR_SGRP_F_DELETE; 1440 else 1441 br_multicast_new_group_src(pg, &src_ip); 1442 srcs += src_size; 1443 } 1444 1445 __grp_src_delete_marked(pg); 1446 } 1447 1448 /* State Msg type New state Actions 1449 * EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=GMI 1450 * Delete (X-A) 1451 * Delete (Y-A) 1452 * Group Timer=GMI 1453 */ 1454 static bool __grp_src_isexc_excl(struct net_bridge_port_group *pg, 1455 void *srcs, u32 nsrcs, size_t src_size) 1456 { 1457 struct net_bridge *br = pg->port->br; 1458 struct net_bridge_group_src *ent; 1459 unsigned long now = jiffies; 1460 bool changed = false; 1461 struct br_ip src_ip; 1462 u32 src_idx; 1463 1464 hlist_for_each_entry(ent, &pg->src_list, node) 1465 ent->flags |= BR_SGRP_F_DELETE; 1466 1467 memset(&src_ip, 0, sizeof(src_ip)); 1468 src_ip.proto = pg->addr.proto; 1469 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 1470 memcpy(&src_ip.u, srcs, src_size); 1471 ent = br_multicast_find_group_src(pg, &src_ip); 1472 if (ent) { 1473 ent->flags &= ~BR_SGRP_F_DELETE; 1474 } else { 1475 ent = br_multicast_new_group_src(pg, &src_ip); 1476 if (ent) { 1477 mod_timer(&ent->timer, 1478 now + br_multicast_gmi(br)); 1479 changed = true; 1480 } 1481 } 1482 srcs += src_size; 1483 } 1484 1485 if (__grp_src_delete_marked(pg)) 1486 changed = true; 1487 1488 return changed; 1489 } 1490 1491 static bool br_multicast_isexc(struct net_bridge_port_group *pg, 1492 void *srcs, u32 nsrcs, size_t src_size) 1493 { 1494 struct net_bridge *br = pg->port->br; 1495 bool changed = false; 1496 1497 switch (pg->filter_mode) { 1498 case MCAST_INCLUDE: 1499 __grp_src_isexc_incl(pg, srcs, nsrcs, src_size); 1500 changed = true; 1501 break; 1502 case MCAST_EXCLUDE: 1503 changed = __grp_src_isexc_excl(pg, srcs, nsrcs, src_size); 1504 break; 1505 } 1506 1507 pg->filter_mode = MCAST_EXCLUDE; 1508 mod_timer(&pg->timer, jiffies + br_multicast_gmi(br)); 1509 1510 return changed; 1511 } 1512 1513 /* State Msg type New state Actions 1514 * INCLUDE (A) TO_IN (B) INCLUDE (A+B) (B)=GMI 1515 * Send Q(G,A-B) 1516 */ 1517 static bool __grp_src_toin_incl(struct net_bridge_port_group *pg, 1518 void *srcs, u32 nsrcs, size_t src_size) 1519 { 1520 struct net_bridge *br = pg->port->br; 1521 u32 src_idx, to_send = pg->src_ents; 1522 struct net_bridge_group_src *ent; 1523 unsigned long now = jiffies; 1524 bool changed = false; 1525 struct br_ip src_ip; 1526 1527 hlist_for_each_entry(ent, &pg->src_list, node) 1528 ent->flags |= BR_SGRP_F_SEND; 1529 1530 memset(&src_ip, 0, sizeof(src_ip)); 1531 src_ip.proto = pg->addr.proto; 1532 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 1533 memcpy(&src_ip.u, srcs, src_size); 1534 ent = br_multicast_find_group_src(pg, &src_ip); 1535 if (ent) { 1536 ent->flags &= ~BR_SGRP_F_SEND; 1537 to_send--; 1538 } else { 1539 ent = br_multicast_new_group_src(pg, &src_ip); 1540 if (ent) 1541 changed = true; 1542 } 1543 if (ent) 1544 mod_timer(&ent->timer, now + br_multicast_gmi(br)); 1545 srcs += src_size; 1546 } 1547 1548 if (to_send) 1549 __grp_src_query_marked_and_rexmit(pg); 1550 1551 return changed; 1552 } 1553 1554 /* State Msg type New state Actions 1555 * EXCLUDE (X,Y) TO_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI 1556 * Send Q(G,X-A) 1557 * Send Q(G) 1558 */ 1559 static bool __grp_src_toin_excl(struct net_bridge_port_group *pg, 1560 void *srcs, u32 nsrcs, size_t src_size) 1561 { 1562 struct net_bridge *br = pg->port->br; 1563 u32 src_idx, to_send = pg->src_ents; 1564 struct net_bridge_group_src *ent; 1565 unsigned long now = jiffies; 1566 bool changed = false; 1567 struct br_ip src_ip; 1568 1569 hlist_for_each_entry(ent, &pg->src_list, node) 1570 if (timer_pending(&ent->timer)) 1571 ent->flags |= BR_SGRP_F_SEND; 1572 1573 memset(&src_ip, 0, sizeof(src_ip)); 1574 src_ip.proto = pg->addr.proto; 1575 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 1576 memcpy(&src_ip.u, srcs, src_size); 1577 ent = br_multicast_find_group_src(pg, &src_ip); 1578 if (ent) { 1579 if (timer_pending(&ent->timer)) { 1580 ent->flags &= ~BR_SGRP_F_SEND; 1581 to_send--; 1582 } 1583 } else { 1584 ent = br_multicast_new_group_src(pg, &src_ip); 1585 if (ent) 1586 changed = true; 1587 } 1588 if (ent) 1589 mod_timer(&ent->timer, now + br_multicast_gmi(br)); 1590 srcs += src_size; 1591 } 1592 1593 if (to_send) 1594 __grp_src_query_marked_and_rexmit(pg); 1595 1596 __grp_send_query_and_rexmit(pg); 1597 1598 return changed; 1599 } 1600 1601 static bool br_multicast_toin(struct net_bridge_port_group *pg, 1602 void *srcs, u32 nsrcs, size_t src_size) 1603 { 1604 bool changed = false; 1605 1606 switch (pg->filter_mode) { 1607 case MCAST_INCLUDE: 1608 changed = __grp_src_toin_incl(pg, srcs, nsrcs, src_size); 1609 break; 1610 case MCAST_EXCLUDE: 1611 changed = __grp_src_toin_excl(pg, srcs, nsrcs, src_size); 1612 break; 1613 } 1614 1615 return changed; 1616 } 1617 1618 /* State Msg type New state Actions 1619 * INCLUDE (A) TO_EX (B) EXCLUDE (A*B,B-A) (B-A)=0 1620 * Delete (A-B) 1621 * Send Q(G,A*B) 1622 * Group Timer=GMI 1623 */ 1624 static void __grp_src_toex_incl(struct net_bridge_port_group *pg, 1625 void *srcs, u32 nsrcs, size_t src_size) 1626 { 1627 struct net_bridge_group_src *ent; 1628 u32 src_idx, to_send = 0; 1629 struct br_ip src_ip; 1630 1631 hlist_for_each_entry(ent, &pg->src_list, node) 1632 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE; 1633 1634 memset(&src_ip, 0, sizeof(src_ip)); 1635 src_ip.proto = pg->addr.proto; 1636 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 1637 memcpy(&src_ip.u, srcs, src_size); 1638 ent = br_multicast_find_group_src(pg, &src_ip); 1639 if (ent) { 1640 ent->flags = (ent->flags & ~BR_SGRP_F_DELETE) | 1641 BR_SGRP_F_SEND; 1642 to_send++; 1643 } else { 1644 br_multicast_new_group_src(pg, &src_ip); 1645 } 1646 srcs += src_size; 1647 } 1648 1649 __grp_src_delete_marked(pg); 1650 if (to_send) 1651 __grp_src_query_marked_and_rexmit(pg); 1652 } 1653 1654 /* State Msg type New state Actions 1655 * EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=Group Timer 1656 * Delete (X-A) 1657 * Delete (Y-A) 1658 * Send Q(G,A-Y) 1659 * Group Timer=GMI 1660 */ 1661 static bool __grp_src_toex_excl(struct net_bridge_port_group *pg, 1662 void *srcs, u32 nsrcs, size_t src_size) 1663 { 1664 struct net_bridge_group_src *ent; 1665 u32 src_idx, to_send = 0; 1666 bool changed = false; 1667 struct br_ip src_ip; 1668 1669 hlist_for_each_entry(ent, &pg->src_list, node) 1670 ent->flags = (ent->flags & ~BR_SGRP_F_SEND) | BR_SGRP_F_DELETE; 1671 1672 memset(&src_ip, 0, sizeof(src_ip)); 1673 src_ip.proto = pg->addr.proto; 1674 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 1675 memcpy(&src_ip.u, srcs, src_size); 1676 ent = br_multicast_find_group_src(pg, &src_ip); 1677 if (ent) { 1678 ent->flags &= ~BR_SGRP_F_DELETE; 1679 } else { 1680 ent = br_multicast_new_group_src(pg, &src_ip); 1681 if (ent) { 1682 mod_timer(&ent->timer, pg->timer.expires); 1683 changed = true; 1684 } 1685 } 1686 if (ent && timer_pending(&ent->timer)) { 1687 ent->flags |= BR_SGRP_F_SEND; 1688 to_send++; 1689 } 1690 srcs += src_size; 1691 } 1692 1693 if (__grp_src_delete_marked(pg)) 1694 changed = true; 1695 if (to_send) 1696 __grp_src_query_marked_and_rexmit(pg); 1697 1698 return changed; 1699 } 1700 1701 static bool br_multicast_toex(struct net_bridge_port_group *pg, 1702 void *srcs, u32 nsrcs, size_t src_size) 1703 { 1704 struct net_bridge *br = pg->port->br; 1705 bool changed = false; 1706 1707 switch (pg->filter_mode) { 1708 case MCAST_INCLUDE: 1709 __grp_src_toex_incl(pg, srcs, nsrcs, src_size); 1710 changed = true; 1711 break; 1712 case MCAST_EXCLUDE: 1713 __grp_src_toex_excl(pg, srcs, nsrcs, src_size); 1714 break; 1715 } 1716 1717 pg->filter_mode = MCAST_EXCLUDE; 1718 mod_timer(&pg->timer, jiffies + br_multicast_gmi(br)); 1719 1720 return changed; 1721 } 1722 1723 /* State Msg type New state Actions 1724 * INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B) 1725 */ 1726 static void __grp_src_block_incl(struct net_bridge_port_group *pg, 1727 void *srcs, u32 nsrcs, size_t src_size) 1728 { 1729 struct net_bridge_group_src *ent; 1730 u32 src_idx, to_send = 0; 1731 struct br_ip src_ip; 1732 1733 hlist_for_each_entry(ent, &pg->src_list, node) 1734 ent->flags &= ~BR_SGRP_F_SEND; 1735 1736 memset(&src_ip, 0, sizeof(src_ip)); 1737 src_ip.proto = pg->addr.proto; 1738 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 1739 memcpy(&src_ip.u, srcs, src_size); 1740 ent = br_multicast_find_group_src(pg, &src_ip); 1741 if (ent) { 1742 ent->flags |= BR_SGRP_F_SEND; 1743 to_send++; 1744 } 1745 srcs += src_size; 1746 } 1747 1748 if (to_send) 1749 __grp_src_query_marked_and_rexmit(pg); 1750 1751 if (pg->filter_mode == MCAST_INCLUDE && hlist_empty(&pg->src_list)) 1752 br_multicast_find_del_pg(pg->port->br, pg); 1753 } 1754 1755 /* State Msg type New state Actions 1756 * EXCLUDE (X,Y) BLOCK (A) EXCLUDE (X+(A-Y),Y) (A-X-Y)=Group Timer 1757 * Send Q(G,A-Y) 1758 */ 1759 static bool __grp_src_block_excl(struct net_bridge_port_group *pg, 1760 void *srcs, u32 nsrcs, size_t src_size) 1761 { 1762 struct net_bridge_group_src *ent; 1763 u32 src_idx, to_send = 0; 1764 bool changed = false; 1765 struct br_ip src_ip; 1766 1767 hlist_for_each_entry(ent, &pg->src_list, node) 1768 ent->flags &= ~BR_SGRP_F_SEND; 1769 1770 memset(&src_ip, 0, sizeof(src_ip)); 1771 src_ip.proto = pg->addr.proto; 1772 for (src_idx = 0; src_idx < nsrcs; src_idx++) { 1773 memcpy(&src_ip.u, srcs, src_size); 1774 ent = br_multicast_find_group_src(pg, &src_ip); 1775 if (!ent) { 1776 ent = br_multicast_new_group_src(pg, &src_ip); 1777 if (ent) { 1778 mod_timer(&ent->timer, pg->timer.expires); 1779 changed = true; 1780 } 1781 } 1782 if (ent && timer_pending(&ent->timer)) { 1783 ent->flags |= BR_SGRP_F_SEND; 1784 to_send++; 1785 } 1786 srcs += src_size; 1787 } 1788 1789 if (to_send) 1790 __grp_src_query_marked_and_rexmit(pg); 1791 1792 return changed; 1793 } 1794 1795 static bool br_multicast_block(struct net_bridge_port_group *pg, 1796 void *srcs, u32 nsrcs, size_t src_size) 1797 { 1798 bool changed = false; 1799 1800 switch (pg->filter_mode) { 1801 case MCAST_INCLUDE: 1802 __grp_src_block_incl(pg, srcs, nsrcs, src_size); 1803 break; 1804 case MCAST_EXCLUDE: 1805 changed = __grp_src_block_excl(pg, srcs, nsrcs, src_size); 1806 break; 1807 } 1808 1809 return changed; 1810 } 1811 1812 static struct net_bridge_port_group * 1813 br_multicast_find_port(struct net_bridge_mdb_entry *mp, 1814 struct net_bridge_port *p, 1815 const unsigned char *src) 1816 { 1817 struct net_bridge *br __maybe_unused = mp->br; 1818 struct net_bridge_port_group *pg; 1819 1820 for (pg = mlock_dereference(mp->ports, br); 1821 pg; 1822 pg = mlock_dereference(pg->next, br)) 1823 if (br_port_group_equal(pg, p, src)) 1824 return pg; 1825 1826 return NULL; 1827 } 1828 1829 static int br_ip4_multicast_igmp3_report(struct net_bridge *br, 1830 struct net_bridge_port *port, 1831 struct sk_buff *skb, 1832 u16 vid) 1833 { 1834 bool igmpv2 = br->multicast_igmp_version == 2; 1835 struct net_bridge_mdb_entry *mdst; 1836 struct net_bridge_port_group *pg; 1837 const unsigned char *src; 1838 struct igmpv3_report *ih; 1839 struct igmpv3_grec *grec; 1840 int i, len, num, type; 1841 bool changed = false; 1842 __be32 group; 1843 int err = 0; 1844 u16 nsrcs; 1845 1846 ih = igmpv3_report_hdr(skb); 1847 num = ntohs(ih->ngrec); 1848 len = skb_transport_offset(skb) + sizeof(*ih); 1849 1850 for (i = 0; i < num; i++) { 1851 len += sizeof(*grec); 1852 if (!ip_mc_may_pull(skb, len)) 1853 return -EINVAL; 1854 1855 grec = (void *)(skb->data + len - sizeof(*grec)); 1856 group = grec->grec_mca; 1857 type = grec->grec_type; 1858 nsrcs = ntohs(grec->grec_nsrcs); 1859 1860 len += nsrcs * 4; 1861 if (!ip_mc_may_pull(skb, len)) 1862 return -EINVAL; 1863 1864 switch (type) { 1865 case IGMPV3_MODE_IS_INCLUDE: 1866 case IGMPV3_MODE_IS_EXCLUDE: 1867 case IGMPV3_CHANGE_TO_INCLUDE: 1868 case IGMPV3_CHANGE_TO_EXCLUDE: 1869 case IGMPV3_ALLOW_NEW_SOURCES: 1870 case IGMPV3_BLOCK_OLD_SOURCES: 1871 break; 1872 1873 default: 1874 continue; 1875 } 1876 1877 src = eth_hdr(skb)->h_source; 1878 if (nsrcs == 0 && 1879 (type == IGMPV3_CHANGE_TO_INCLUDE || 1880 type == IGMPV3_MODE_IS_INCLUDE)) { 1881 if (!port || igmpv2) { 1882 br_ip4_multicast_leave_group(br, port, group, vid, src); 1883 continue; 1884 } 1885 } else { 1886 err = br_ip4_multicast_add_group(br, port, group, vid, 1887 src, igmpv2); 1888 if (err) 1889 break; 1890 } 1891 1892 if (!port || igmpv2) 1893 continue; 1894 1895 spin_lock_bh(&br->multicast_lock); 1896 mdst = br_mdb_ip4_get(br, group, vid); 1897 if (!mdst) 1898 goto unlock_continue; 1899 pg = br_multicast_find_port(mdst, port, src); 1900 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT)) 1901 goto unlock_continue; 1902 /* reload grec */ 1903 grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4)); 1904 switch (type) { 1905 case IGMPV3_ALLOW_NEW_SOURCES: 1906 changed = br_multicast_isinc_allow(pg, grec->grec_src, 1907 nsrcs, sizeof(__be32)); 1908 break; 1909 case IGMPV3_MODE_IS_INCLUDE: 1910 changed = br_multicast_isinc_allow(pg, grec->grec_src, nsrcs, 1911 sizeof(__be32)); 1912 break; 1913 case IGMPV3_MODE_IS_EXCLUDE: 1914 changed = br_multicast_isexc(pg, grec->grec_src, nsrcs, 1915 sizeof(__be32)); 1916 break; 1917 case IGMPV3_CHANGE_TO_INCLUDE: 1918 changed = br_multicast_toin(pg, grec->grec_src, nsrcs, 1919 sizeof(__be32)); 1920 break; 1921 case IGMPV3_CHANGE_TO_EXCLUDE: 1922 changed = br_multicast_toex(pg, grec->grec_src, nsrcs, 1923 sizeof(__be32)); 1924 break; 1925 case IGMPV3_BLOCK_OLD_SOURCES: 1926 changed = br_multicast_block(pg, grec->grec_src, nsrcs, 1927 sizeof(__be32)); 1928 break; 1929 } 1930 if (changed) 1931 br_mdb_notify(br->dev, mdst, pg, RTM_NEWMDB); 1932 unlock_continue: 1933 spin_unlock_bh(&br->multicast_lock); 1934 } 1935 1936 return err; 1937 } 1938 1939 #if IS_ENABLED(CONFIG_IPV6) 1940 static int br_ip6_multicast_mld2_report(struct net_bridge *br, 1941 struct net_bridge_port *port, 1942 struct sk_buff *skb, 1943 u16 vid) 1944 { 1945 bool mldv1 = br->multicast_mld_version == 1; 1946 struct net_bridge_mdb_entry *mdst; 1947 struct net_bridge_port_group *pg; 1948 unsigned int nsrcs_offset; 1949 const unsigned char *src; 1950 struct icmp6hdr *icmp6h; 1951 struct mld2_grec *grec; 1952 unsigned int grec_len; 1953 bool changed = false; 1954 int i, len, num; 1955 int err = 0; 1956 1957 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h))) 1958 return -EINVAL; 1959 1960 icmp6h = icmp6_hdr(skb); 1961 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 1962 len = skb_transport_offset(skb) + sizeof(*icmp6h); 1963 1964 for (i = 0; i < num; i++) { 1965 __be16 *_nsrcs, __nsrcs; 1966 u16 nsrcs; 1967 1968 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs); 1969 1970 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < 1971 nsrcs_offset + sizeof(__nsrcs)) 1972 return -EINVAL; 1973 1974 _nsrcs = skb_header_pointer(skb, nsrcs_offset, 1975 sizeof(__nsrcs), &__nsrcs); 1976 if (!_nsrcs) 1977 return -EINVAL; 1978 1979 nsrcs = ntohs(*_nsrcs); 1980 grec_len = struct_size(grec, grec_src, nsrcs); 1981 1982 if (!ipv6_mc_may_pull(skb, len + grec_len)) 1983 return -EINVAL; 1984 1985 grec = (struct mld2_grec *)(skb->data + len); 1986 len += grec_len; 1987 1988 switch (grec->grec_type) { 1989 case MLD2_MODE_IS_INCLUDE: 1990 case MLD2_MODE_IS_EXCLUDE: 1991 case MLD2_CHANGE_TO_INCLUDE: 1992 case MLD2_CHANGE_TO_EXCLUDE: 1993 case MLD2_ALLOW_NEW_SOURCES: 1994 case MLD2_BLOCK_OLD_SOURCES: 1995 break; 1996 1997 default: 1998 continue; 1999 } 2000 2001 src = eth_hdr(skb)->h_source; 2002 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE || 2003 grec->grec_type == MLD2_MODE_IS_INCLUDE) && 2004 nsrcs == 0) { 2005 if (!port || mldv1) { 2006 br_ip6_multicast_leave_group(br, port, 2007 &grec->grec_mca, 2008 vid, src); 2009 continue; 2010 } 2011 } else { 2012 err = br_ip6_multicast_add_group(br, port, 2013 &grec->grec_mca, vid, 2014 src, mldv1); 2015 if (err) 2016 break; 2017 } 2018 2019 if (!port || mldv1) 2020 continue; 2021 2022 spin_lock_bh(&br->multicast_lock); 2023 mdst = br_mdb_ip6_get(br, &grec->grec_mca, vid); 2024 if (!mdst) 2025 goto unlock_continue; 2026 pg = br_multicast_find_port(mdst, port, src); 2027 if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT)) 2028 goto unlock_continue; 2029 switch (grec->grec_type) { 2030 case MLD2_ALLOW_NEW_SOURCES: 2031 changed = br_multicast_isinc_allow(pg, grec->grec_src, 2032 nsrcs, 2033 sizeof(struct in6_addr)); 2034 break; 2035 case MLD2_MODE_IS_INCLUDE: 2036 changed = br_multicast_isinc_allow(pg, grec->grec_src, nsrcs, 2037 sizeof(struct in6_addr)); 2038 break; 2039 case MLD2_MODE_IS_EXCLUDE: 2040 changed = br_multicast_isexc(pg, grec->grec_src, nsrcs, 2041 sizeof(struct in6_addr)); 2042 break; 2043 case MLD2_CHANGE_TO_INCLUDE: 2044 changed = br_multicast_toin(pg, grec->grec_src, nsrcs, 2045 sizeof(struct in6_addr)); 2046 break; 2047 case MLD2_CHANGE_TO_EXCLUDE: 2048 changed = br_multicast_toex(pg, grec->grec_src, nsrcs, 2049 sizeof(struct in6_addr)); 2050 break; 2051 case MLD2_BLOCK_OLD_SOURCES: 2052 changed = br_multicast_block(pg, grec->grec_src, nsrcs, 2053 sizeof(struct in6_addr)); 2054 break; 2055 } 2056 if (changed) 2057 br_mdb_notify(br->dev, mdst, pg, RTM_NEWMDB); 2058 unlock_continue: 2059 spin_unlock_bh(&br->multicast_lock); 2060 } 2061 2062 return err; 2063 } 2064 #endif 2065 2066 static bool br_ip4_multicast_select_querier(struct net_bridge *br, 2067 struct net_bridge_port *port, 2068 __be32 saddr) 2069 { 2070 if (!timer_pending(&br->ip4_own_query.timer) && 2071 !timer_pending(&br->ip4_other_query.timer)) 2072 goto update; 2073 2074 if (!br->ip4_querier.addr.u.ip4) 2075 goto update; 2076 2077 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4)) 2078 goto update; 2079 2080 return false; 2081 2082 update: 2083 br->ip4_querier.addr.u.ip4 = saddr; 2084 2085 /* update protected by general multicast_lock by caller */ 2086 rcu_assign_pointer(br->ip4_querier.port, port); 2087 2088 return true; 2089 } 2090 2091 #if IS_ENABLED(CONFIG_IPV6) 2092 static bool br_ip6_multicast_select_querier(struct net_bridge *br, 2093 struct net_bridge_port *port, 2094 struct in6_addr *saddr) 2095 { 2096 if (!timer_pending(&br->ip6_own_query.timer) && 2097 !timer_pending(&br->ip6_other_query.timer)) 2098 goto update; 2099 2100 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0) 2101 goto update; 2102 2103 return false; 2104 2105 update: 2106 br->ip6_querier.addr.u.ip6 = *saddr; 2107 2108 /* update protected by general multicast_lock by caller */ 2109 rcu_assign_pointer(br->ip6_querier.port, port); 2110 2111 return true; 2112 } 2113 #endif 2114 2115 static bool br_multicast_select_querier(struct net_bridge *br, 2116 struct net_bridge_port *port, 2117 struct br_ip *saddr) 2118 { 2119 switch (saddr->proto) { 2120 case htons(ETH_P_IP): 2121 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4); 2122 #if IS_ENABLED(CONFIG_IPV6) 2123 case htons(ETH_P_IPV6): 2124 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6); 2125 #endif 2126 } 2127 2128 return false; 2129 } 2130 2131 static void 2132 br_multicast_update_query_timer(struct net_bridge *br, 2133 struct bridge_mcast_other_query *query, 2134 unsigned long max_delay) 2135 { 2136 if (!timer_pending(&query->timer)) 2137 query->delay_time = jiffies + max_delay; 2138 2139 mod_timer(&query->timer, jiffies + br->multicast_querier_interval); 2140 } 2141 2142 static void br_port_mc_router_state_change(struct net_bridge_port *p, 2143 bool is_mc_router) 2144 { 2145 struct switchdev_attr attr = { 2146 .orig_dev = p->dev, 2147 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER, 2148 .flags = SWITCHDEV_F_DEFER, 2149 .u.mrouter = is_mc_router, 2150 }; 2151 2152 switchdev_port_attr_set(p->dev, &attr); 2153 } 2154 2155 /* 2156 * Add port to router_list 2157 * list is maintained ordered by pointer value 2158 * and locked by br->multicast_lock and RCU 2159 */ 2160 static void br_multicast_add_router(struct net_bridge *br, 2161 struct net_bridge_port *port) 2162 { 2163 struct net_bridge_port *p; 2164 struct hlist_node *slot = NULL; 2165 2166 if (!hlist_unhashed(&port->rlist)) 2167 return; 2168 2169 hlist_for_each_entry(p, &br->router_list, rlist) { 2170 if ((unsigned long) port >= (unsigned long) p) 2171 break; 2172 slot = &p->rlist; 2173 } 2174 2175 if (slot) 2176 hlist_add_behind_rcu(&port->rlist, slot); 2177 else 2178 hlist_add_head_rcu(&port->rlist, &br->router_list); 2179 br_rtr_notify(br->dev, port, RTM_NEWMDB); 2180 br_port_mc_router_state_change(port, true); 2181 } 2182 2183 static void br_multicast_mark_router(struct net_bridge *br, 2184 struct net_bridge_port *port) 2185 { 2186 unsigned long now = jiffies; 2187 2188 if (!port) { 2189 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) { 2190 if (!timer_pending(&br->multicast_router_timer)) 2191 br_mc_router_state_change(br, true); 2192 mod_timer(&br->multicast_router_timer, 2193 now + br->multicast_querier_interval); 2194 } 2195 return; 2196 } 2197 2198 if (port->multicast_router == MDB_RTR_TYPE_DISABLED || 2199 port->multicast_router == MDB_RTR_TYPE_PERM) 2200 return; 2201 2202 br_multicast_add_router(br, port); 2203 2204 mod_timer(&port->multicast_router_timer, 2205 now + br->multicast_querier_interval); 2206 } 2207 2208 static void br_multicast_query_received(struct net_bridge *br, 2209 struct net_bridge_port *port, 2210 struct bridge_mcast_other_query *query, 2211 struct br_ip *saddr, 2212 unsigned long max_delay) 2213 { 2214 if (!br_multicast_select_querier(br, port, saddr)) 2215 return; 2216 2217 br_multicast_update_query_timer(br, query, max_delay); 2218 br_multicast_mark_router(br, port); 2219 } 2220 2221 static void br_ip4_multicast_query(struct net_bridge *br, 2222 struct net_bridge_port *port, 2223 struct sk_buff *skb, 2224 u16 vid) 2225 { 2226 unsigned int transport_len = ip_transport_len(skb); 2227 const struct iphdr *iph = ip_hdr(skb); 2228 struct igmphdr *ih = igmp_hdr(skb); 2229 struct net_bridge_mdb_entry *mp; 2230 struct igmpv3_query *ih3; 2231 struct net_bridge_port_group *p; 2232 struct net_bridge_port_group __rcu **pp; 2233 struct br_ip saddr; 2234 unsigned long max_delay; 2235 unsigned long now = jiffies; 2236 __be32 group; 2237 2238 spin_lock(&br->multicast_lock); 2239 if (!netif_running(br->dev) || 2240 (port && port->state == BR_STATE_DISABLED)) 2241 goto out; 2242 2243 group = ih->group; 2244 2245 if (transport_len == sizeof(*ih)) { 2246 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 2247 2248 if (!max_delay) { 2249 max_delay = 10 * HZ; 2250 group = 0; 2251 } 2252 } else if (transport_len >= sizeof(*ih3)) { 2253 ih3 = igmpv3_query_hdr(skb); 2254 if (ih3->nsrcs || 2255 (br->multicast_igmp_version == 3 && group && ih3->suppress)) 2256 goto out; 2257 2258 max_delay = ih3->code ? 2259 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 2260 } else { 2261 goto out; 2262 } 2263 2264 if (!group) { 2265 saddr.proto = htons(ETH_P_IP); 2266 saddr.u.ip4 = iph->saddr; 2267 2268 br_multicast_query_received(br, port, &br->ip4_other_query, 2269 &saddr, max_delay); 2270 goto out; 2271 } 2272 2273 mp = br_mdb_ip4_get(br, group, vid); 2274 if (!mp) 2275 goto out; 2276 2277 max_delay *= br->multicast_last_member_count; 2278 2279 if (mp->host_joined && 2280 (timer_pending(&mp->timer) ? 2281 time_after(mp->timer.expires, now + max_delay) : 2282 try_to_del_timer_sync(&mp->timer) >= 0)) 2283 mod_timer(&mp->timer, now + max_delay); 2284 2285 for (pp = &mp->ports; 2286 (p = mlock_dereference(*pp, br)) != NULL; 2287 pp = &p->next) { 2288 if (timer_pending(&p->timer) ? 2289 time_after(p->timer.expires, now + max_delay) : 2290 try_to_del_timer_sync(&p->timer) >= 0 && 2291 (br->multicast_igmp_version == 2 || 2292 p->filter_mode == MCAST_EXCLUDE)) 2293 mod_timer(&p->timer, now + max_delay); 2294 } 2295 2296 out: 2297 spin_unlock(&br->multicast_lock); 2298 } 2299 2300 #if IS_ENABLED(CONFIG_IPV6) 2301 static int br_ip6_multicast_query(struct net_bridge *br, 2302 struct net_bridge_port *port, 2303 struct sk_buff *skb, 2304 u16 vid) 2305 { 2306 unsigned int transport_len = ipv6_transport_len(skb); 2307 struct mld_msg *mld; 2308 struct net_bridge_mdb_entry *mp; 2309 struct mld2_query *mld2q; 2310 struct net_bridge_port_group *p; 2311 struct net_bridge_port_group __rcu **pp; 2312 struct br_ip saddr; 2313 unsigned long max_delay; 2314 unsigned long now = jiffies; 2315 unsigned int offset = skb_transport_offset(skb); 2316 const struct in6_addr *group = NULL; 2317 bool is_general_query; 2318 int err = 0; 2319 2320 spin_lock(&br->multicast_lock); 2321 if (!netif_running(br->dev) || 2322 (port && port->state == BR_STATE_DISABLED)) 2323 goto out; 2324 2325 if (transport_len == sizeof(*mld)) { 2326 if (!pskb_may_pull(skb, offset + sizeof(*mld))) { 2327 err = -EINVAL; 2328 goto out; 2329 } 2330 mld = (struct mld_msg *) icmp6_hdr(skb); 2331 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); 2332 if (max_delay) 2333 group = &mld->mld_mca; 2334 } else { 2335 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) { 2336 err = -EINVAL; 2337 goto out; 2338 } 2339 mld2q = (struct mld2_query *)icmp6_hdr(skb); 2340 if (!mld2q->mld2q_nsrcs) 2341 group = &mld2q->mld2q_mca; 2342 if (br->multicast_mld_version == 2 && 2343 !ipv6_addr_any(&mld2q->mld2q_mca) && 2344 mld2q->mld2q_suppress) 2345 goto out; 2346 2347 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); 2348 } 2349 2350 is_general_query = group && ipv6_addr_any(group); 2351 2352 if (is_general_query) { 2353 saddr.proto = htons(ETH_P_IPV6); 2354 saddr.u.ip6 = ipv6_hdr(skb)->saddr; 2355 2356 br_multicast_query_received(br, port, &br->ip6_other_query, 2357 &saddr, max_delay); 2358 goto out; 2359 } else if (!group) { 2360 goto out; 2361 } 2362 2363 mp = br_mdb_ip6_get(br, group, vid); 2364 if (!mp) 2365 goto out; 2366 2367 max_delay *= br->multicast_last_member_count; 2368 if (mp->host_joined && 2369 (timer_pending(&mp->timer) ? 2370 time_after(mp->timer.expires, now + max_delay) : 2371 try_to_del_timer_sync(&mp->timer) >= 0)) 2372 mod_timer(&mp->timer, now + max_delay); 2373 2374 for (pp = &mp->ports; 2375 (p = mlock_dereference(*pp, br)) != NULL; 2376 pp = &p->next) { 2377 if (timer_pending(&p->timer) ? 2378 time_after(p->timer.expires, now + max_delay) : 2379 try_to_del_timer_sync(&p->timer) >= 0 && 2380 (br->multicast_mld_version == 1 || 2381 p->filter_mode == MCAST_EXCLUDE)) 2382 mod_timer(&p->timer, now + max_delay); 2383 } 2384 2385 out: 2386 spin_unlock(&br->multicast_lock); 2387 return err; 2388 } 2389 #endif 2390 2391 static void 2392 br_multicast_leave_group(struct net_bridge *br, 2393 struct net_bridge_port *port, 2394 struct br_ip *group, 2395 struct bridge_mcast_other_query *other_query, 2396 struct bridge_mcast_own_query *own_query, 2397 const unsigned char *src) 2398 { 2399 struct net_bridge_mdb_entry *mp; 2400 struct net_bridge_port_group *p; 2401 unsigned long now; 2402 unsigned long time; 2403 2404 spin_lock(&br->multicast_lock); 2405 if (!netif_running(br->dev) || 2406 (port && port->state == BR_STATE_DISABLED)) 2407 goto out; 2408 2409 mp = br_mdb_ip_get(br, group); 2410 if (!mp) 2411 goto out; 2412 2413 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { 2414 struct net_bridge_port_group __rcu **pp; 2415 2416 for (pp = &mp->ports; 2417 (p = mlock_dereference(*pp, br)) != NULL; 2418 pp = &p->next) { 2419 if (!br_port_group_equal(p, port, src)) 2420 continue; 2421 2422 if (p->flags & MDB_PG_FLAGS_PERMANENT) 2423 break; 2424 2425 p->flags |= MDB_PG_FLAGS_FAST_LEAVE; 2426 br_multicast_del_pg(mp, p, pp); 2427 } 2428 goto out; 2429 } 2430 2431 if (timer_pending(&other_query->timer)) 2432 goto out; 2433 2434 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) { 2435 __br_multicast_send_query(br, port, NULL, NULL, &mp->addr, 2436 false, 0, NULL); 2437 2438 time = jiffies + br->multicast_last_member_count * 2439 br->multicast_last_member_interval; 2440 2441 mod_timer(&own_query->timer, time); 2442 2443 for (p = mlock_dereference(mp->ports, br); 2444 p != NULL; 2445 p = mlock_dereference(p->next, br)) { 2446 if (!br_port_group_equal(p, port, src)) 2447 continue; 2448 2449 if (!hlist_unhashed(&p->mglist) && 2450 (timer_pending(&p->timer) ? 2451 time_after(p->timer.expires, time) : 2452 try_to_del_timer_sync(&p->timer) >= 0)) { 2453 mod_timer(&p->timer, time); 2454 } 2455 2456 break; 2457 } 2458 } 2459 2460 now = jiffies; 2461 time = now + br->multicast_last_member_count * 2462 br->multicast_last_member_interval; 2463 2464 if (!port) { 2465 if (mp->host_joined && 2466 (timer_pending(&mp->timer) ? 2467 time_after(mp->timer.expires, time) : 2468 try_to_del_timer_sync(&mp->timer) >= 0)) { 2469 mod_timer(&mp->timer, time); 2470 } 2471 2472 goto out; 2473 } 2474 2475 for (p = mlock_dereference(mp->ports, br); 2476 p != NULL; 2477 p = mlock_dereference(p->next, br)) { 2478 if (p->port != port) 2479 continue; 2480 2481 if (!hlist_unhashed(&p->mglist) && 2482 (timer_pending(&p->timer) ? 2483 time_after(p->timer.expires, time) : 2484 try_to_del_timer_sync(&p->timer) >= 0)) { 2485 mod_timer(&p->timer, time); 2486 } 2487 2488 break; 2489 } 2490 out: 2491 spin_unlock(&br->multicast_lock); 2492 } 2493 2494 static void br_ip4_multicast_leave_group(struct net_bridge *br, 2495 struct net_bridge_port *port, 2496 __be32 group, 2497 __u16 vid, 2498 const unsigned char *src) 2499 { 2500 struct br_ip br_group; 2501 struct bridge_mcast_own_query *own_query; 2502 2503 if (ipv4_is_local_multicast(group)) 2504 return; 2505 2506 own_query = port ? &port->ip4_own_query : &br->ip4_own_query; 2507 2508 memset(&br_group, 0, sizeof(br_group)); 2509 br_group.u.ip4 = group; 2510 br_group.proto = htons(ETH_P_IP); 2511 br_group.vid = vid; 2512 2513 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query, 2514 own_query, src); 2515 } 2516 2517 #if IS_ENABLED(CONFIG_IPV6) 2518 static void br_ip6_multicast_leave_group(struct net_bridge *br, 2519 struct net_bridge_port *port, 2520 const struct in6_addr *group, 2521 __u16 vid, 2522 const unsigned char *src) 2523 { 2524 struct br_ip br_group; 2525 struct bridge_mcast_own_query *own_query; 2526 2527 if (ipv6_addr_is_ll_all_nodes(group)) 2528 return; 2529 2530 own_query = port ? &port->ip6_own_query : &br->ip6_own_query; 2531 2532 memset(&br_group, 0, sizeof(br_group)); 2533 br_group.u.ip6 = *group; 2534 br_group.proto = htons(ETH_P_IPV6); 2535 br_group.vid = vid; 2536 2537 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query, 2538 own_query, src); 2539 } 2540 #endif 2541 2542 static void br_multicast_err_count(const struct net_bridge *br, 2543 const struct net_bridge_port *p, 2544 __be16 proto) 2545 { 2546 struct bridge_mcast_stats __percpu *stats; 2547 struct bridge_mcast_stats *pstats; 2548 2549 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 2550 return; 2551 2552 if (p) 2553 stats = p->mcast_stats; 2554 else 2555 stats = br->mcast_stats; 2556 if (WARN_ON(!stats)) 2557 return; 2558 2559 pstats = this_cpu_ptr(stats); 2560 2561 u64_stats_update_begin(&pstats->syncp); 2562 switch (proto) { 2563 case htons(ETH_P_IP): 2564 pstats->mstats.igmp_parse_errors++; 2565 break; 2566 #if IS_ENABLED(CONFIG_IPV6) 2567 case htons(ETH_P_IPV6): 2568 pstats->mstats.mld_parse_errors++; 2569 break; 2570 #endif 2571 } 2572 u64_stats_update_end(&pstats->syncp); 2573 } 2574 2575 static void br_multicast_pim(struct net_bridge *br, 2576 struct net_bridge_port *port, 2577 const struct sk_buff *skb) 2578 { 2579 unsigned int offset = skb_transport_offset(skb); 2580 struct pimhdr *pimhdr, _pimhdr; 2581 2582 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr); 2583 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION || 2584 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO) 2585 return; 2586 2587 br_multicast_mark_router(br, port); 2588 } 2589 2590 static int br_ip4_multicast_mrd_rcv(struct net_bridge *br, 2591 struct net_bridge_port *port, 2592 struct sk_buff *skb) 2593 { 2594 if (ip_hdr(skb)->protocol != IPPROTO_IGMP || 2595 igmp_hdr(skb)->type != IGMP_MRDISC_ADV) 2596 return -ENOMSG; 2597 2598 br_multicast_mark_router(br, port); 2599 2600 return 0; 2601 } 2602 2603 static int br_multicast_ipv4_rcv(struct net_bridge *br, 2604 struct net_bridge_port *port, 2605 struct sk_buff *skb, 2606 u16 vid) 2607 { 2608 const unsigned char *src; 2609 struct igmphdr *ih; 2610 int err; 2611 2612 err = ip_mc_check_igmp(skb); 2613 2614 if (err == -ENOMSG) { 2615 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) { 2616 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 2617 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) { 2618 if (ip_hdr(skb)->protocol == IPPROTO_PIM) 2619 br_multicast_pim(br, port, skb); 2620 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) { 2621 br_ip4_multicast_mrd_rcv(br, port, skb); 2622 } 2623 2624 return 0; 2625 } else if (err < 0) { 2626 br_multicast_err_count(br, port, skb->protocol); 2627 return err; 2628 } 2629 2630 ih = igmp_hdr(skb); 2631 src = eth_hdr(skb)->h_source; 2632 BR_INPUT_SKB_CB(skb)->igmp = ih->type; 2633 2634 switch (ih->type) { 2635 case IGMP_HOST_MEMBERSHIP_REPORT: 2636 case IGMPV2_HOST_MEMBERSHIP_REPORT: 2637 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 2638 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src, 2639 true); 2640 break; 2641 case IGMPV3_HOST_MEMBERSHIP_REPORT: 2642 err = br_ip4_multicast_igmp3_report(br, port, skb, vid); 2643 break; 2644 case IGMP_HOST_MEMBERSHIP_QUERY: 2645 br_ip4_multicast_query(br, port, skb, vid); 2646 break; 2647 case IGMP_HOST_LEAVE_MESSAGE: 2648 br_ip4_multicast_leave_group(br, port, ih->group, vid, src); 2649 break; 2650 } 2651 2652 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp, 2653 BR_MCAST_DIR_RX); 2654 2655 return err; 2656 } 2657 2658 #if IS_ENABLED(CONFIG_IPV6) 2659 static int br_ip6_multicast_mrd_rcv(struct net_bridge *br, 2660 struct net_bridge_port *port, 2661 struct sk_buff *skb) 2662 { 2663 int ret; 2664 2665 if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6) 2666 return -ENOMSG; 2667 2668 ret = ipv6_mc_check_icmpv6(skb); 2669 if (ret < 0) 2670 return ret; 2671 2672 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV) 2673 return -ENOMSG; 2674 2675 br_multicast_mark_router(br, port); 2676 2677 return 0; 2678 } 2679 2680 static int br_multicast_ipv6_rcv(struct net_bridge *br, 2681 struct net_bridge_port *port, 2682 struct sk_buff *skb, 2683 u16 vid) 2684 { 2685 const unsigned char *src; 2686 struct mld_msg *mld; 2687 int err; 2688 2689 err = ipv6_mc_check_mld(skb); 2690 2691 if (err == -ENOMSG) { 2692 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr)) 2693 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 2694 2695 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) { 2696 err = br_ip6_multicast_mrd_rcv(br, port, skb); 2697 2698 if (err < 0 && err != -ENOMSG) { 2699 br_multicast_err_count(br, port, skb->protocol); 2700 return err; 2701 } 2702 } 2703 2704 return 0; 2705 } else if (err < 0) { 2706 br_multicast_err_count(br, port, skb->protocol); 2707 return err; 2708 } 2709 2710 mld = (struct mld_msg *)skb_transport_header(skb); 2711 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type; 2712 2713 switch (mld->mld_type) { 2714 case ICMPV6_MGM_REPORT: 2715 src = eth_hdr(skb)->h_source; 2716 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 2717 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid, 2718 src, true); 2719 break; 2720 case ICMPV6_MLD2_REPORT: 2721 err = br_ip6_multicast_mld2_report(br, port, skb, vid); 2722 break; 2723 case ICMPV6_MGM_QUERY: 2724 err = br_ip6_multicast_query(br, port, skb, vid); 2725 break; 2726 case ICMPV6_MGM_REDUCTION: 2727 src = eth_hdr(skb)->h_source; 2728 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src); 2729 break; 2730 } 2731 2732 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp, 2733 BR_MCAST_DIR_RX); 2734 2735 return err; 2736 } 2737 #endif 2738 2739 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 2740 struct sk_buff *skb, u16 vid) 2741 { 2742 int ret = 0; 2743 2744 BR_INPUT_SKB_CB(skb)->igmp = 0; 2745 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 2746 2747 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 2748 return 0; 2749 2750 switch (skb->protocol) { 2751 case htons(ETH_P_IP): 2752 ret = br_multicast_ipv4_rcv(br, port, skb, vid); 2753 break; 2754 #if IS_ENABLED(CONFIG_IPV6) 2755 case htons(ETH_P_IPV6): 2756 ret = br_multicast_ipv6_rcv(br, port, skb, vid); 2757 break; 2758 #endif 2759 } 2760 2761 return ret; 2762 } 2763 2764 static void br_multicast_query_expired(struct net_bridge *br, 2765 struct bridge_mcast_own_query *query, 2766 struct bridge_mcast_querier *querier) 2767 { 2768 spin_lock(&br->multicast_lock); 2769 if (query->startup_sent < br->multicast_startup_query_count) 2770 query->startup_sent++; 2771 2772 RCU_INIT_POINTER(querier->port, NULL); 2773 br_multicast_send_query(br, NULL, query); 2774 spin_unlock(&br->multicast_lock); 2775 } 2776 2777 static void br_ip4_multicast_query_expired(struct timer_list *t) 2778 { 2779 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer); 2780 2781 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier); 2782 } 2783 2784 #if IS_ENABLED(CONFIG_IPV6) 2785 static void br_ip6_multicast_query_expired(struct timer_list *t) 2786 { 2787 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer); 2788 2789 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier); 2790 } 2791 #endif 2792 2793 static void br_multicast_gc_work(struct work_struct *work) 2794 { 2795 struct net_bridge *br = container_of(work, struct net_bridge, 2796 mcast_gc_work); 2797 HLIST_HEAD(deleted_head); 2798 2799 spin_lock_bh(&br->multicast_lock); 2800 hlist_move_list(&br->mcast_gc_list, &deleted_head); 2801 spin_unlock_bh(&br->multicast_lock); 2802 2803 br_multicast_gc(&deleted_head); 2804 } 2805 2806 void br_multicast_init(struct net_bridge *br) 2807 { 2808 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX; 2809 2810 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 2811 br->multicast_last_member_count = 2; 2812 br->multicast_startup_query_count = 2; 2813 2814 br->multicast_last_member_interval = HZ; 2815 br->multicast_query_response_interval = 10 * HZ; 2816 br->multicast_startup_query_interval = 125 * HZ / 4; 2817 br->multicast_query_interval = 125 * HZ; 2818 br->multicast_querier_interval = 255 * HZ; 2819 br->multicast_membership_interval = 260 * HZ; 2820 2821 br->ip4_other_query.delay_time = 0; 2822 br->ip4_querier.port = NULL; 2823 br->multicast_igmp_version = 2; 2824 #if IS_ENABLED(CONFIG_IPV6) 2825 br->multicast_mld_version = 1; 2826 br->ip6_other_query.delay_time = 0; 2827 br->ip6_querier.port = NULL; 2828 #endif 2829 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true); 2830 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true); 2831 2832 spin_lock_init(&br->multicast_lock); 2833 timer_setup(&br->multicast_router_timer, 2834 br_multicast_local_router_expired, 0); 2835 timer_setup(&br->ip4_other_query.timer, 2836 br_ip4_multicast_querier_expired, 0); 2837 timer_setup(&br->ip4_own_query.timer, 2838 br_ip4_multicast_query_expired, 0); 2839 #if IS_ENABLED(CONFIG_IPV6) 2840 timer_setup(&br->ip6_other_query.timer, 2841 br_ip6_multicast_querier_expired, 0); 2842 timer_setup(&br->ip6_own_query.timer, 2843 br_ip6_multicast_query_expired, 0); 2844 #endif 2845 INIT_HLIST_HEAD(&br->mdb_list); 2846 INIT_HLIST_HEAD(&br->mcast_gc_list); 2847 INIT_WORK(&br->mcast_gc_work, br_multicast_gc_work); 2848 } 2849 2850 static void br_ip4_multicast_join_snoopers(struct net_bridge *br) 2851 { 2852 struct in_device *in_dev = in_dev_get(br->dev); 2853 2854 if (!in_dev) 2855 return; 2856 2857 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 2858 in_dev_put(in_dev); 2859 } 2860 2861 #if IS_ENABLED(CONFIG_IPV6) 2862 static void br_ip6_multicast_join_snoopers(struct net_bridge *br) 2863 { 2864 struct in6_addr addr; 2865 2866 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 2867 ipv6_dev_mc_inc(br->dev, &addr); 2868 } 2869 #else 2870 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br) 2871 { 2872 } 2873 #endif 2874 2875 static void br_multicast_join_snoopers(struct net_bridge *br) 2876 { 2877 br_ip4_multicast_join_snoopers(br); 2878 br_ip6_multicast_join_snoopers(br); 2879 } 2880 2881 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br) 2882 { 2883 struct in_device *in_dev = in_dev_get(br->dev); 2884 2885 if (WARN_ON(!in_dev)) 2886 return; 2887 2888 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 2889 in_dev_put(in_dev); 2890 } 2891 2892 #if IS_ENABLED(CONFIG_IPV6) 2893 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 2894 { 2895 struct in6_addr addr; 2896 2897 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 2898 ipv6_dev_mc_dec(br->dev, &addr); 2899 } 2900 #else 2901 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 2902 { 2903 } 2904 #endif 2905 2906 static void br_multicast_leave_snoopers(struct net_bridge *br) 2907 { 2908 br_ip4_multicast_leave_snoopers(br); 2909 br_ip6_multicast_leave_snoopers(br); 2910 } 2911 2912 static void __br_multicast_open(struct net_bridge *br, 2913 struct bridge_mcast_own_query *query) 2914 { 2915 query->startup_sent = 0; 2916 2917 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 2918 return; 2919 2920 mod_timer(&query->timer, jiffies); 2921 } 2922 2923 void br_multicast_open(struct net_bridge *br) 2924 { 2925 if (br_opt_get(br, BROPT_MULTICAST_ENABLED)) 2926 br_multicast_join_snoopers(br); 2927 2928 __br_multicast_open(br, &br->ip4_own_query); 2929 #if IS_ENABLED(CONFIG_IPV6) 2930 __br_multicast_open(br, &br->ip6_own_query); 2931 #endif 2932 } 2933 2934 void br_multicast_stop(struct net_bridge *br) 2935 { 2936 del_timer_sync(&br->multicast_router_timer); 2937 del_timer_sync(&br->ip4_other_query.timer); 2938 del_timer_sync(&br->ip4_own_query.timer); 2939 #if IS_ENABLED(CONFIG_IPV6) 2940 del_timer_sync(&br->ip6_other_query.timer); 2941 del_timer_sync(&br->ip6_own_query.timer); 2942 #endif 2943 2944 if (br_opt_get(br, BROPT_MULTICAST_ENABLED)) 2945 br_multicast_leave_snoopers(br); 2946 } 2947 2948 void br_multicast_dev_del(struct net_bridge *br) 2949 { 2950 struct net_bridge_mdb_entry *mp; 2951 HLIST_HEAD(deleted_head); 2952 struct hlist_node *tmp; 2953 2954 spin_lock_bh(&br->multicast_lock); 2955 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) 2956 br_multicast_del_mdb_entry(mp); 2957 hlist_move_list(&br->mcast_gc_list, &deleted_head); 2958 spin_unlock_bh(&br->multicast_lock); 2959 2960 br_multicast_gc(&deleted_head); 2961 cancel_work_sync(&br->mcast_gc_work); 2962 2963 rcu_barrier(); 2964 } 2965 2966 int br_multicast_set_router(struct net_bridge *br, unsigned long val) 2967 { 2968 int err = -EINVAL; 2969 2970 spin_lock_bh(&br->multicast_lock); 2971 2972 switch (val) { 2973 case MDB_RTR_TYPE_DISABLED: 2974 case MDB_RTR_TYPE_PERM: 2975 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM); 2976 del_timer(&br->multicast_router_timer); 2977 br->multicast_router = val; 2978 err = 0; 2979 break; 2980 case MDB_RTR_TYPE_TEMP_QUERY: 2981 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY) 2982 br_mc_router_state_change(br, false); 2983 br->multicast_router = val; 2984 err = 0; 2985 break; 2986 } 2987 2988 spin_unlock_bh(&br->multicast_lock); 2989 2990 return err; 2991 } 2992 2993 static void __del_port_router(struct net_bridge_port *p) 2994 { 2995 if (hlist_unhashed(&p->rlist)) 2996 return; 2997 hlist_del_init_rcu(&p->rlist); 2998 br_rtr_notify(p->br->dev, p, RTM_DELMDB); 2999 br_port_mc_router_state_change(p, false); 3000 3001 /* don't allow timer refresh */ 3002 if (p->multicast_router == MDB_RTR_TYPE_TEMP) 3003 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 3004 } 3005 3006 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) 3007 { 3008 struct net_bridge *br = p->br; 3009 unsigned long now = jiffies; 3010 int err = -EINVAL; 3011 3012 spin_lock(&br->multicast_lock); 3013 if (p->multicast_router == val) { 3014 /* Refresh the temp router port timer */ 3015 if (p->multicast_router == MDB_RTR_TYPE_TEMP) 3016 mod_timer(&p->multicast_router_timer, 3017 now + br->multicast_querier_interval); 3018 err = 0; 3019 goto unlock; 3020 } 3021 switch (val) { 3022 case MDB_RTR_TYPE_DISABLED: 3023 p->multicast_router = MDB_RTR_TYPE_DISABLED; 3024 __del_port_router(p); 3025 del_timer(&p->multicast_router_timer); 3026 break; 3027 case MDB_RTR_TYPE_TEMP_QUERY: 3028 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 3029 __del_port_router(p); 3030 break; 3031 case MDB_RTR_TYPE_PERM: 3032 p->multicast_router = MDB_RTR_TYPE_PERM; 3033 del_timer(&p->multicast_router_timer); 3034 br_multicast_add_router(br, p); 3035 break; 3036 case MDB_RTR_TYPE_TEMP: 3037 p->multicast_router = MDB_RTR_TYPE_TEMP; 3038 br_multicast_mark_router(br, p); 3039 break; 3040 default: 3041 goto unlock; 3042 } 3043 err = 0; 3044 unlock: 3045 spin_unlock(&br->multicast_lock); 3046 3047 return err; 3048 } 3049 3050 static void br_multicast_start_querier(struct net_bridge *br, 3051 struct bridge_mcast_own_query *query) 3052 { 3053 struct net_bridge_port *port; 3054 3055 __br_multicast_open(br, query); 3056 3057 rcu_read_lock(); 3058 list_for_each_entry_rcu(port, &br->port_list, list) { 3059 if (port->state == BR_STATE_DISABLED || 3060 port->state == BR_STATE_BLOCKING) 3061 continue; 3062 3063 if (query == &br->ip4_own_query) 3064 br_multicast_enable(&port->ip4_own_query); 3065 #if IS_ENABLED(CONFIG_IPV6) 3066 else 3067 br_multicast_enable(&port->ip6_own_query); 3068 #endif 3069 } 3070 rcu_read_unlock(); 3071 } 3072 3073 int br_multicast_toggle(struct net_bridge *br, unsigned long val) 3074 { 3075 struct net_bridge_port *port; 3076 3077 spin_lock_bh(&br->multicast_lock); 3078 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val) 3079 goto unlock; 3080 3081 br_mc_disabled_update(br->dev, val); 3082 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val); 3083 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) { 3084 br_multicast_leave_snoopers(br); 3085 goto unlock; 3086 } 3087 3088 if (!netif_running(br->dev)) 3089 goto unlock; 3090 3091 br_multicast_open(br); 3092 list_for_each_entry(port, &br->port_list, list) 3093 __br_multicast_enable_port(port); 3094 3095 unlock: 3096 spin_unlock_bh(&br->multicast_lock); 3097 3098 return 0; 3099 } 3100 3101 bool br_multicast_enabled(const struct net_device *dev) 3102 { 3103 struct net_bridge *br = netdev_priv(dev); 3104 3105 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED); 3106 } 3107 EXPORT_SYMBOL_GPL(br_multicast_enabled); 3108 3109 bool br_multicast_router(const struct net_device *dev) 3110 { 3111 struct net_bridge *br = netdev_priv(dev); 3112 bool is_router; 3113 3114 spin_lock_bh(&br->multicast_lock); 3115 is_router = br_multicast_is_router(br); 3116 spin_unlock_bh(&br->multicast_lock); 3117 return is_router; 3118 } 3119 EXPORT_SYMBOL_GPL(br_multicast_router); 3120 3121 int br_multicast_set_querier(struct net_bridge *br, unsigned long val) 3122 { 3123 unsigned long max_delay; 3124 3125 val = !!val; 3126 3127 spin_lock_bh(&br->multicast_lock); 3128 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val) 3129 goto unlock; 3130 3131 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val); 3132 if (!val) 3133 goto unlock; 3134 3135 max_delay = br->multicast_query_response_interval; 3136 3137 if (!timer_pending(&br->ip4_other_query.timer)) 3138 br->ip4_other_query.delay_time = jiffies + max_delay; 3139 3140 br_multicast_start_querier(br, &br->ip4_own_query); 3141 3142 #if IS_ENABLED(CONFIG_IPV6) 3143 if (!timer_pending(&br->ip6_other_query.timer)) 3144 br->ip6_other_query.delay_time = jiffies + max_delay; 3145 3146 br_multicast_start_querier(br, &br->ip6_own_query); 3147 #endif 3148 3149 unlock: 3150 spin_unlock_bh(&br->multicast_lock); 3151 3152 return 0; 3153 } 3154 3155 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val) 3156 { 3157 /* Currently we support only version 2 and 3 */ 3158 switch (val) { 3159 case 2: 3160 case 3: 3161 break; 3162 default: 3163 return -EINVAL; 3164 } 3165 3166 spin_lock_bh(&br->multicast_lock); 3167 br->multicast_igmp_version = val; 3168 spin_unlock_bh(&br->multicast_lock); 3169 3170 return 0; 3171 } 3172 3173 #if IS_ENABLED(CONFIG_IPV6) 3174 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val) 3175 { 3176 /* Currently we support version 1 and 2 */ 3177 switch (val) { 3178 case 1: 3179 case 2: 3180 break; 3181 default: 3182 return -EINVAL; 3183 } 3184 3185 spin_lock_bh(&br->multicast_lock); 3186 br->multicast_mld_version = val; 3187 spin_unlock_bh(&br->multicast_lock); 3188 3189 return 0; 3190 } 3191 #endif 3192 3193 /** 3194 * br_multicast_list_adjacent - Returns snooped multicast addresses 3195 * @dev: The bridge port adjacent to which to retrieve addresses 3196 * @br_ip_list: The list to store found, snooped multicast IP addresses in 3197 * 3198 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast 3199 * snooping feature on all bridge ports of dev's bridge device, excluding 3200 * the addresses from dev itself. 3201 * 3202 * Returns the number of items added to br_ip_list. 3203 * 3204 * Notes: 3205 * - br_ip_list needs to be initialized by caller 3206 * - br_ip_list might contain duplicates in the end 3207 * (needs to be taken care of by caller) 3208 * - br_ip_list needs to be freed by caller 3209 */ 3210 int br_multicast_list_adjacent(struct net_device *dev, 3211 struct list_head *br_ip_list) 3212 { 3213 struct net_bridge *br; 3214 struct net_bridge_port *port; 3215 struct net_bridge_port_group *group; 3216 struct br_ip_list *entry; 3217 int count = 0; 3218 3219 rcu_read_lock(); 3220 if (!br_ip_list || !netif_is_bridge_port(dev)) 3221 goto unlock; 3222 3223 port = br_port_get_rcu(dev); 3224 if (!port || !port->br) 3225 goto unlock; 3226 3227 br = port->br; 3228 3229 list_for_each_entry_rcu(port, &br->port_list, list) { 3230 if (!port->dev || port->dev == dev) 3231 continue; 3232 3233 hlist_for_each_entry_rcu(group, &port->mglist, mglist) { 3234 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 3235 if (!entry) 3236 goto unlock; 3237 3238 entry->addr = group->addr; 3239 list_add(&entry->list, br_ip_list); 3240 count++; 3241 } 3242 } 3243 3244 unlock: 3245 rcu_read_unlock(); 3246 return count; 3247 } 3248 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); 3249 3250 /** 3251 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge 3252 * @dev: The bridge port providing the bridge on which to check for a querier 3253 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 3254 * 3255 * Checks whether the given interface has a bridge on top and if so returns 3256 * true if a valid querier exists anywhere on the bridged link layer. 3257 * Otherwise returns false. 3258 */ 3259 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto) 3260 { 3261 struct net_bridge *br; 3262 struct net_bridge_port *port; 3263 struct ethhdr eth; 3264 bool ret = false; 3265 3266 rcu_read_lock(); 3267 if (!netif_is_bridge_port(dev)) 3268 goto unlock; 3269 3270 port = br_port_get_rcu(dev); 3271 if (!port || !port->br) 3272 goto unlock; 3273 3274 br = port->br; 3275 3276 memset(ð, 0, sizeof(eth)); 3277 eth.h_proto = htons(proto); 3278 3279 ret = br_multicast_querier_exists(br, ð); 3280 3281 unlock: 3282 rcu_read_unlock(); 3283 return ret; 3284 } 3285 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere); 3286 3287 /** 3288 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port 3289 * @dev: The bridge port adjacent to which to check for a querier 3290 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 3291 * 3292 * Checks whether the given interface has a bridge on top and if so returns 3293 * true if a selected querier is behind one of the other ports of this 3294 * bridge. Otherwise returns false. 3295 */ 3296 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) 3297 { 3298 struct net_bridge *br; 3299 struct net_bridge_port *port; 3300 bool ret = false; 3301 3302 rcu_read_lock(); 3303 if (!netif_is_bridge_port(dev)) 3304 goto unlock; 3305 3306 port = br_port_get_rcu(dev); 3307 if (!port || !port->br) 3308 goto unlock; 3309 3310 br = port->br; 3311 3312 switch (proto) { 3313 case ETH_P_IP: 3314 if (!timer_pending(&br->ip4_other_query.timer) || 3315 rcu_dereference(br->ip4_querier.port) == port) 3316 goto unlock; 3317 break; 3318 #if IS_ENABLED(CONFIG_IPV6) 3319 case ETH_P_IPV6: 3320 if (!timer_pending(&br->ip6_other_query.timer) || 3321 rcu_dereference(br->ip6_querier.port) == port) 3322 goto unlock; 3323 break; 3324 #endif 3325 default: 3326 goto unlock; 3327 } 3328 3329 ret = true; 3330 unlock: 3331 rcu_read_unlock(); 3332 return ret; 3333 } 3334 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); 3335 3336 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats, 3337 const struct sk_buff *skb, u8 type, u8 dir) 3338 { 3339 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats); 3340 __be16 proto = skb->protocol; 3341 unsigned int t_len; 3342 3343 u64_stats_update_begin(&pstats->syncp); 3344 switch (proto) { 3345 case htons(ETH_P_IP): 3346 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); 3347 switch (type) { 3348 case IGMP_HOST_MEMBERSHIP_REPORT: 3349 pstats->mstats.igmp_v1reports[dir]++; 3350 break; 3351 case IGMPV2_HOST_MEMBERSHIP_REPORT: 3352 pstats->mstats.igmp_v2reports[dir]++; 3353 break; 3354 case IGMPV3_HOST_MEMBERSHIP_REPORT: 3355 pstats->mstats.igmp_v3reports[dir]++; 3356 break; 3357 case IGMP_HOST_MEMBERSHIP_QUERY: 3358 if (t_len != sizeof(struct igmphdr)) { 3359 pstats->mstats.igmp_v3queries[dir]++; 3360 } else { 3361 unsigned int offset = skb_transport_offset(skb); 3362 struct igmphdr *ih, _ihdr; 3363 3364 ih = skb_header_pointer(skb, offset, 3365 sizeof(_ihdr), &_ihdr); 3366 if (!ih) 3367 break; 3368 if (!ih->code) 3369 pstats->mstats.igmp_v1queries[dir]++; 3370 else 3371 pstats->mstats.igmp_v2queries[dir]++; 3372 } 3373 break; 3374 case IGMP_HOST_LEAVE_MESSAGE: 3375 pstats->mstats.igmp_leaves[dir]++; 3376 break; 3377 } 3378 break; 3379 #if IS_ENABLED(CONFIG_IPV6) 3380 case htons(ETH_P_IPV6): 3381 t_len = ntohs(ipv6_hdr(skb)->payload_len) + 3382 sizeof(struct ipv6hdr); 3383 t_len -= skb_network_header_len(skb); 3384 switch (type) { 3385 case ICMPV6_MGM_REPORT: 3386 pstats->mstats.mld_v1reports[dir]++; 3387 break; 3388 case ICMPV6_MLD2_REPORT: 3389 pstats->mstats.mld_v2reports[dir]++; 3390 break; 3391 case ICMPV6_MGM_QUERY: 3392 if (t_len != sizeof(struct mld_msg)) 3393 pstats->mstats.mld_v2queries[dir]++; 3394 else 3395 pstats->mstats.mld_v1queries[dir]++; 3396 break; 3397 case ICMPV6_MGM_REDUCTION: 3398 pstats->mstats.mld_leaves[dir]++; 3399 break; 3400 } 3401 break; 3402 #endif /* CONFIG_IPV6 */ 3403 } 3404 u64_stats_update_end(&pstats->syncp); 3405 } 3406 3407 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 3408 const struct sk_buff *skb, u8 type, u8 dir) 3409 { 3410 struct bridge_mcast_stats __percpu *stats; 3411 3412 /* if multicast_disabled is true then igmp type can't be set */ 3413 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 3414 return; 3415 3416 if (p) 3417 stats = p->mcast_stats; 3418 else 3419 stats = br->mcast_stats; 3420 if (WARN_ON(!stats)) 3421 return; 3422 3423 br_mcast_stats_add(stats, skb, type, dir); 3424 } 3425 3426 int br_multicast_init_stats(struct net_bridge *br) 3427 { 3428 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 3429 if (!br->mcast_stats) 3430 return -ENOMEM; 3431 3432 return 0; 3433 } 3434 3435 void br_multicast_uninit_stats(struct net_bridge *br) 3436 { 3437 free_percpu(br->mcast_stats); 3438 } 3439 3440 /* noinline for https://bugs.llvm.org/show_bug.cgi?id=45802#c9 */ 3441 static noinline_for_stack void mcast_stats_add_dir(u64 *dst, u64 *src) 3442 { 3443 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX]; 3444 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX]; 3445 } 3446 3447 void br_multicast_get_stats(const struct net_bridge *br, 3448 const struct net_bridge_port *p, 3449 struct br_mcast_stats *dest) 3450 { 3451 struct bridge_mcast_stats __percpu *stats; 3452 struct br_mcast_stats tdst; 3453 int i; 3454 3455 memset(dest, 0, sizeof(*dest)); 3456 if (p) 3457 stats = p->mcast_stats; 3458 else 3459 stats = br->mcast_stats; 3460 if (WARN_ON(!stats)) 3461 return; 3462 3463 memset(&tdst, 0, sizeof(tdst)); 3464 for_each_possible_cpu(i) { 3465 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i); 3466 struct br_mcast_stats temp; 3467 unsigned int start; 3468 3469 do { 3470 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); 3471 memcpy(&temp, &cpu_stats->mstats, sizeof(temp)); 3472 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); 3473 3474 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries); 3475 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries); 3476 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries); 3477 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves); 3478 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports); 3479 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports); 3480 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports); 3481 tdst.igmp_parse_errors += temp.igmp_parse_errors; 3482 3483 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries); 3484 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries); 3485 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves); 3486 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports); 3487 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports); 3488 tdst.mld_parse_errors += temp.mld_parse_errors; 3489 } 3490 memcpy(dest, &tdst, sizeof(*dest)); 3491 } 3492 3493 int br_mdb_hash_init(struct net_bridge *br) 3494 { 3495 return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params); 3496 } 3497 3498 void br_mdb_hash_fini(struct net_bridge *br) 3499 { 3500 rhashtable_destroy(&br->mdb_hash_tbl); 3501 } 3502