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 54 static void __del_port_router(struct net_bridge_port *p); 55 #if IS_ENABLED(CONFIG_IPV6) 56 static void br_ip6_multicast_leave_group(struct net_bridge *br, 57 struct net_bridge_port *port, 58 const struct in6_addr *group, 59 __u16 vid, const unsigned char *src); 60 #endif 61 62 static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br, 63 struct br_ip *dst) 64 { 65 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params); 66 } 67 68 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br, 69 struct br_ip *dst) 70 { 71 struct net_bridge_mdb_entry *ent; 72 73 lockdep_assert_held_once(&br->multicast_lock); 74 75 rcu_read_lock(); 76 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params); 77 rcu_read_unlock(); 78 79 return ent; 80 } 81 82 static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br, 83 __be32 dst, __u16 vid) 84 { 85 struct br_ip br_dst; 86 87 memset(&br_dst, 0, sizeof(br_dst)); 88 br_dst.u.ip4 = dst; 89 br_dst.proto = htons(ETH_P_IP); 90 br_dst.vid = vid; 91 92 return br_mdb_ip_get(br, &br_dst); 93 } 94 95 #if IS_ENABLED(CONFIG_IPV6) 96 static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br, 97 const struct in6_addr *dst, 98 __u16 vid) 99 { 100 struct br_ip br_dst; 101 102 memset(&br_dst, 0, sizeof(br_dst)); 103 br_dst.u.ip6 = *dst; 104 br_dst.proto = htons(ETH_P_IPV6); 105 br_dst.vid = vid; 106 107 return br_mdb_ip_get(br, &br_dst); 108 } 109 #endif 110 111 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 112 struct sk_buff *skb, u16 vid) 113 { 114 struct br_ip ip; 115 116 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 117 return NULL; 118 119 if (BR_INPUT_SKB_CB(skb)->igmp) 120 return NULL; 121 122 memset(&ip, 0, sizeof(ip)); 123 ip.proto = skb->protocol; 124 ip.vid = vid; 125 126 switch (skb->protocol) { 127 case htons(ETH_P_IP): 128 ip.u.ip4 = ip_hdr(skb)->daddr; 129 break; 130 #if IS_ENABLED(CONFIG_IPV6) 131 case htons(ETH_P_IPV6): 132 ip.u.ip6 = ipv6_hdr(skb)->daddr; 133 break; 134 #endif 135 default: 136 return NULL; 137 } 138 139 return br_mdb_ip_get_rcu(br, &ip); 140 } 141 142 static void br_multicast_group_expired(struct timer_list *t) 143 { 144 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer); 145 struct net_bridge *br = mp->br; 146 147 spin_lock(&br->multicast_lock); 148 if (!netif_running(br->dev) || timer_pending(&mp->timer)) 149 goto out; 150 151 br_multicast_host_leave(mp, true); 152 153 if (mp->ports) 154 goto out; 155 156 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode, 157 br_mdb_rht_params); 158 hlist_del_rcu(&mp->mdb_node); 159 160 kfree_rcu(mp, rcu); 161 162 out: 163 spin_unlock(&br->multicast_lock); 164 } 165 166 static void br_multicast_del_pg(struct net_bridge *br, 167 struct net_bridge_port_group *pg) 168 { 169 struct net_bridge_mdb_entry *mp; 170 struct net_bridge_port_group *p; 171 struct net_bridge_port_group __rcu **pp; 172 173 mp = br_mdb_ip_get(br, &pg->addr); 174 if (WARN_ON(!mp)) 175 return; 176 177 for (pp = &mp->ports; 178 (p = mlock_dereference(*pp, br)) != NULL; 179 pp = &p->next) { 180 if (p != pg) 181 continue; 182 183 rcu_assign_pointer(*pp, p->next); 184 hlist_del_init(&p->mglist); 185 del_timer(&p->timer); 186 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB, 187 p->flags); 188 kfree_rcu(p, rcu); 189 190 if (!mp->ports && !mp->host_joined && 191 netif_running(br->dev)) 192 mod_timer(&mp->timer, jiffies); 193 194 return; 195 } 196 197 WARN_ON(1); 198 } 199 200 static void br_multicast_port_group_expired(struct timer_list *t) 201 { 202 struct net_bridge_port_group *pg = from_timer(pg, t, timer); 203 struct net_bridge *br = pg->port->br; 204 205 spin_lock(&br->multicast_lock); 206 if (!netif_running(br->dev) || timer_pending(&pg->timer) || 207 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT) 208 goto out; 209 210 br_multicast_del_pg(br, pg); 211 212 out: 213 spin_unlock(&br->multicast_lock); 214 } 215 216 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, 217 __be32 group, 218 u8 *igmp_type) 219 { 220 struct igmpv3_query *ihv3; 221 size_t igmp_hdr_size; 222 struct sk_buff *skb; 223 struct igmphdr *ih; 224 struct ethhdr *eth; 225 struct iphdr *iph; 226 227 igmp_hdr_size = sizeof(*ih); 228 if (br->multicast_igmp_version == 3) 229 igmp_hdr_size = sizeof(*ihv3); 230 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + 231 igmp_hdr_size + 4); 232 if (!skb) 233 goto out; 234 235 skb->protocol = htons(ETH_P_IP); 236 237 skb_reset_mac_header(skb); 238 eth = eth_hdr(skb); 239 240 ether_addr_copy(eth->h_source, br->dev->dev_addr); 241 eth->h_dest[0] = 1; 242 eth->h_dest[1] = 0; 243 eth->h_dest[2] = 0x5e; 244 eth->h_dest[3] = 0; 245 eth->h_dest[4] = 0; 246 eth->h_dest[5] = 1; 247 eth->h_proto = htons(ETH_P_IP); 248 skb_put(skb, sizeof(*eth)); 249 250 skb_set_network_header(skb, skb->len); 251 iph = ip_hdr(skb); 252 253 iph->version = 4; 254 iph->ihl = 6; 255 iph->tos = 0xc0; 256 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4); 257 iph->id = 0; 258 iph->frag_off = htons(IP_DF); 259 iph->ttl = 1; 260 iph->protocol = IPPROTO_IGMP; 261 iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ? 262 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0; 263 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); 264 ((u8 *)&iph[1])[0] = IPOPT_RA; 265 ((u8 *)&iph[1])[1] = 4; 266 ((u8 *)&iph[1])[2] = 0; 267 ((u8 *)&iph[1])[3] = 0; 268 ip_send_check(iph); 269 skb_put(skb, 24); 270 271 skb_set_transport_header(skb, skb->len); 272 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY; 273 274 switch (br->multicast_igmp_version) { 275 case 2: 276 ih = igmp_hdr(skb); 277 ih->type = IGMP_HOST_MEMBERSHIP_QUERY; 278 ih->code = (group ? br->multicast_last_member_interval : 279 br->multicast_query_response_interval) / 280 (HZ / IGMP_TIMER_SCALE); 281 ih->group = group; 282 ih->csum = 0; 283 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih)); 284 break; 285 case 3: 286 ihv3 = igmpv3_query_hdr(skb); 287 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY; 288 ihv3->code = (group ? br->multicast_last_member_interval : 289 br->multicast_query_response_interval) / 290 (HZ / IGMP_TIMER_SCALE); 291 ihv3->group = group; 292 ihv3->qqic = br->multicast_query_interval / HZ; 293 ihv3->nsrcs = 0; 294 ihv3->resv = 0; 295 ihv3->suppress = 0; 296 ihv3->qrv = 2; 297 ihv3->csum = 0; 298 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3)); 299 break; 300 } 301 302 skb_put(skb, igmp_hdr_size); 303 __skb_pull(skb, sizeof(*eth)); 304 305 out: 306 return skb; 307 } 308 309 #if IS_ENABLED(CONFIG_IPV6) 310 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, 311 const struct in6_addr *grp, 312 u8 *igmp_type) 313 { 314 struct mld2_query *mld2q; 315 unsigned long interval; 316 struct ipv6hdr *ip6h; 317 struct mld_msg *mldq; 318 size_t mld_hdr_size; 319 struct sk_buff *skb; 320 struct ethhdr *eth; 321 u8 *hopopt; 322 323 mld_hdr_size = sizeof(*mldq); 324 if (br->multicast_mld_version == 2) 325 mld_hdr_size = sizeof(*mld2q); 326 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + 327 8 + mld_hdr_size); 328 if (!skb) 329 goto out; 330 331 skb->protocol = htons(ETH_P_IPV6); 332 333 /* Ethernet header */ 334 skb_reset_mac_header(skb); 335 eth = eth_hdr(skb); 336 337 ether_addr_copy(eth->h_source, br->dev->dev_addr); 338 eth->h_proto = htons(ETH_P_IPV6); 339 skb_put(skb, sizeof(*eth)); 340 341 /* IPv6 header + HbH option */ 342 skb_set_network_header(skb, skb->len); 343 ip6h = ipv6_hdr(skb); 344 345 *(__force __be32 *)ip6h = htonl(0x60000000); 346 ip6h->payload_len = htons(8 + mld_hdr_size); 347 ip6h->nexthdr = IPPROTO_HOPOPTS; 348 ip6h->hop_limit = 1; 349 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); 350 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, 351 &ip6h->saddr)) { 352 kfree_skb(skb); 353 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false); 354 return NULL; 355 } 356 357 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true); 358 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 359 360 hopopt = (u8 *)(ip6h + 1); 361 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ 362 hopopt[1] = 0; /* length of HbH */ 363 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ 364 hopopt[3] = 2; /* Length of RA Option */ 365 hopopt[4] = 0; /* Type = 0x0000 (MLD) */ 366 hopopt[5] = 0; 367 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ 368 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ 369 370 skb_put(skb, sizeof(*ip6h) + 8); 371 372 /* ICMPv6 */ 373 skb_set_transport_header(skb, skb->len); 374 interval = ipv6_addr_any(grp) ? 375 br->multicast_query_response_interval : 376 br->multicast_last_member_interval; 377 *igmp_type = ICMPV6_MGM_QUERY; 378 switch (br->multicast_mld_version) { 379 case 1: 380 mldq = (struct mld_msg *)icmp6_hdr(skb); 381 mldq->mld_type = ICMPV6_MGM_QUERY; 382 mldq->mld_code = 0; 383 mldq->mld_cksum = 0; 384 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); 385 mldq->mld_reserved = 0; 386 mldq->mld_mca = *grp; 387 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 388 sizeof(*mldq), IPPROTO_ICMPV6, 389 csum_partial(mldq, 390 sizeof(*mldq), 391 0)); 392 break; 393 case 2: 394 mld2q = (struct mld2_query *)icmp6_hdr(skb); 395 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval)); 396 mld2q->mld2q_type = ICMPV6_MGM_QUERY; 397 mld2q->mld2q_code = 0; 398 mld2q->mld2q_cksum = 0; 399 mld2q->mld2q_resv1 = 0; 400 mld2q->mld2q_resv2 = 0; 401 mld2q->mld2q_suppress = 0; 402 mld2q->mld2q_qrv = 2; 403 mld2q->mld2q_nsrcs = 0; 404 mld2q->mld2q_qqic = br->multicast_query_interval / HZ; 405 mld2q->mld2q_mca = *grp; 406 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 407 sizeof(*mld2q), 408 IPPROTO_ICMPV6, 409 csum_partial(mld2q, 410 sizeof(*mld2q), 411 0)); 412 break; 413 } 414 skb_put(skb, mld_hdr_size); 415 416 __skb_pull(skb, sizeof(*eth)); 417 418 out: 419 return skb; 420 } 421 #endif 422 423 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, 424 struct br_ip *addr, 425 u8 *igmp_type) 426 { 427 switch (addr->proto) { 428 case htons(ETH_P_IP): 429 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type); 430 #if IS_ENABLED(CONFIG_IPV6) 431 case htons(ETH_P_IPV6): 432 return br_ip6_multicast_alloc_query(br, &addr->u.ip6, 433 igmp_type); 434 #endif 435 } 436 return NULL; 437 } 438 439 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, 440 struct br_ip *group) 441 { 442 struct net_bridge_mdb_entry *mp; 443 int err; 444 445 mp = br_mdb_ip_get(br, group); 446 if (mp) 447 return mp; 448 449 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) { 450 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false); 451 return ERR_PTR(-E2BIG); 452 } 453 454 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 455 if (unlikely(!mp)) 456 return ERR_PTR(-ENOMEM); 457 458 mp->br = br; 459 mp->addr = *group; 460 timer_setup(&mp->timer, br_multicast_group_expired, 0); 461 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode, 462 br_mdb_rht_params); 463 if (err) { 464 kfree(mp); 465 mp = ERR_PTR(err); 466 } else { 467 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list); 468 } 469 470 return mp; 471 } 472 473 struct net_bridge_port_group *br_multicast_new_port_group( 474 struct net_bridge_port *port, 475 struct br_ip *group, 476 struct net_bridge_port_group __rcu *next, 477 unsigned char flags, 478 const unsigned char *src) 479 { 480 struct net_bridge_port_group *p; 481 482 p = kzalloc(sizeof(*p), GFP_ATOMIC); 483 if (unlikely(!p)) 484 return NULL; 485 486 p->addr = *group; 487 p->port = port; 488 p->flags = flags; 489 rcu_assign_pointer(p->next, next); 490 hlist_add_head(&p->mglist, &port->mglist); 491 timer_setup(&p->timer, br_multicast_port_group_expired, 0); 492 493 if (src) 494 memcpy(p->eth_addr, src, ETH_ALEN); 495 else 496 eth_broadcast_addr(p->eth_addr); 497 498 return p; 499 } 500 501 static bool br_port_group_equal(struct net_bridge_port_group *p, 502 struct net_bridge_port *port, 503 const unsigned char *src) 504 { 505 if (p->port != port) 506 return false; 507 508 if (!(port->flags & BR_MULTICAST_TO_UNICAST)) 509 return true; 510 511 return ether_addr_equal(src, p->eth_addr); 512 } 513 514 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify) 515 { 516 if (!mp->host_joined) { 517 mp->host_joined = true; 518 if (notify) 519 br_mdb_notify(mp->br->dev, NULL, &mp->addr, 520 RTM_NEWMDB, 0); 521 } 522 mod_timer(&mp->timer, jiffies + mp->br->multicast_membership_interval); 523 } 524 525 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify) 526 { 527 if (!mp->host_joined) 528 return; 529 530 mp->host_joined = false; 531 if (notify) 532 br_mdb_notify(mp->br->dev, NULL, &mp->addr, RTM_DELMDB, 0); 533 } 534 535 static int br_multicast_add_group(struct net_bridge *br, 536 struct net_bridge_port *port, 537 struct br_ip *group, 538 const unsigned char *src) 539 { 540 struct net_bridge_port_group __rcu **pp; 541 struct net_bridge_port_group *p; 542 struct net_bridge_mdb_entry *mp; 543 unsigned long now = jiffies; 544 int err; 545 546 spin_lock(&br->multicast_lock); 547 if (!netif_running(br->dev) || 548 (port && port->state == BR_STATE_DISABLED)) 549 goto out; 550 551 mp = br_multicast_new_group(br, group); 552 err = PTR_ERR(mp); 553 if (IS_ERR(mp)) 554 goto err; 555 556 if (!port) { 557 br_multicast_host_join(mp, true); 558 goto out; 559 } 560 561 for (pp = &mp->ports; 562 (p = mlock_dereference(*pp, br)) != NULL; 563 pp = &p->next) { 564 if (br_port_group_equal(p, port, src)) 565 goto found; 566 if ((unsigned long)p->port < (unsigned long)port) 567 break; 568 } 569 570 p = br_multicast_new_port_group(port, group, *pp, 0, src); 571 if (unlikely(!p)) 572 goto err; 573 rcu_assign_pointer(*pp, p); 574 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0); 575 576 found: 577 mod_timer(&p->timer, now + br->multicast_membership_interval); 578 out: 579 err = 0; 580 581 err: 582 spin_unlock(&br->multicast_lock); 583 return err; 584 } 585 586 static int br_ip4_multicast_add_group(struct net_bridge *br, 587 struct net_bridge_port *port, 588 __be32 group, 589 __u16 vid, 590 const unsigned char *src) 591 { 592 struct br_ip br_group; 593 594 if (ipv4_is_local_multicast(group)) 595 return 0; 596 597 memset(&br_group, 0, sizeof(br_group)); 598 br_group.u.ip4 = group; 599 br_group.proto = htons(ETH_P_IP); 600 br_group.vid = vid; 601 602 return br_multicast_add_group(br, port, &br_group, src); 603 } 604 605 #if IS_ENABLED(CONFIG_IPV6) 606 static int br_ip6_multicast_add_group(struct net_bridge *br, 607 struct net_bridge_port *port, 608 const struct in6_addr *group, 609 __u16 vid, 610 const unsigned char *src) 611 { 612 struct br_ip br_group; 613 614 if (ipv6_addr_is_ll_all_nodes(group)) 615 return 0; 616 617 memset(&br_group, 0, sizeof(br_group)); 618 br_group.u.ip6 = *group; 619 br_group.proto = htons(ETH_P_IPV6); 620 br_group.vid = vid; 621 622 return br_multicast_add_group(br, port, &br_group, src); 623 } 624 #endif 625 626 static void br_multicast_router_expired(struct timer_list *t) 627 { 628 struct net_bridge_port *port = 629 from_timer(port, t, multicast_router_timer); 630 struct net_bridge *br = port->br; 631 632 spin_lock(&br->multicast_lock); 633 if (port->multicast_router == MDB_RTR_TYPE_DISABLED || 634 port->multicast_router == MDB_RTR_TYPE_PERM || 635 timer_pending(&port->multicast_router_timer)) 636 goto out; 637 638 __del_port_router(port); 639 out: 640 spin_unlock(&br->multicast_lock); 641 } 642 643 static void br_mc_router_state_change(struct net_bridge *p, 644 bool is_mc_router) 645 { 646 struct switchdev_attr attr = { 647 .orig_dev = p->dev, 648 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER, 649 .flags = SWITCHDEV_F_DEFER, 650 .u.mrouter = is_mc_router, 651 }; 652 653 switchdev_port_attr_set(p->dev, &attr); 654 } 655 656 static void br_multicast_local_router_expired(struct timer_list *t) 657 { 658 struct net_bridge *br = from_timer(br, t, multicast_router_timer); 659 660 spin_lock(&br->multicast_lock); 661 if (br->multicast_router == MDB_RTR_TYPE_DISABLED || 662 br->multicast_router == MDB_RTR_TYPE_PERM || 663 timer_pending(&br->multicast_router_timer)) 664 goto out; 665 666 br_mc_router_state_change(br, false); 667 out: 668 spin_unlock(&br->multicast_lock); 669 } 670 671 static void br_multicast_querier_expired(struct net_bridge *br, 672 struct bridge_mcast_own_query *query) 673 { 674 spin_lock(&br->multicast_lock); 675 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED)) 676 goto out; 677 678 br_multicast_start_querier(br, query); 679 680 out: 681 spin_unlock(&br->multicast_lock); 682 } 683 684 static void br_ip4_multicast_querier_expired(struct timer_list *t) 685 { 686 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer); 687 688 br_multicast_querier_expired(br, &br->ip4_own_query); 689 } 690 691 #if IS_ENABLED(CONFIG_IPV6) 692 static void br_ip6_multicast_querier_expired(struct timer_list *t) 693 { 694 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer); 695 696 br_multicast_querier_expired(br, &br->ip6_own_query); 697 } 698 #endif 699 700 static void br_multicast_select_own_querier(struct net_bridge *br, 701 struct br_ip *ip, 702 struct sk_buff *skb) 703 { 704 if (ip->proto == htons(ETH_P_IP)) 705 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr; 706 #if IS_ENABLED(CONFIG_IPV6) 707 else 708 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr; 709 #endif 710 } 711 712 static void __br_multicast_send_query(struct net_bridge *br, 713 struct net_bridge_port *port, 714 struct br_ip *ip) 715 { 716 struct sk_buff *skb; 717 u8 igmp_type; 718 719 skb = br_multicast_alloc_query(br, ip, &igmp_type); 720 if (!skb) 721 return; 722 723 if (port) { 724 skb->dev = port->dev; 725 br_multicast_count(br, port, skb, igmp_type, 726 BR_MCAST_DIR_TX); 727 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, 728 dev_net(port->dev), NULL, skb, NULL, skb->dev, 729 br_dev_queue_push_xmit); 730 } else { 731 br_multicast_select_own_querier(br, ip, skb); 732 br_multicast_count(br, port, skb, igmp_type, 733 BR_MCAST_DIR_RX); 734 netif_rx(skb); 735 } 736 } 737 738 static void br_multicast_send_query(struct net_bridge *br, 739 struct net_bridge_port *port, 740 struct bridge_mcast_own_query *own_query) 741 { 742 struct bridge_mcast_other_query *other_query = NULL; 743 struct br_ip br_group; 744 unsigned long time; 745 746 if (!netif_running(br->dev) || 747 !br_opt_get(br, BROPT_MULTICAST_ENABLED) || 748 !br_opt_get(br, BROPT_MULTICAST_QUERIER)) 749 return; 750 751 memset(&br_group.u, 0, sizeof(br_group.u)); 752 753 if (port ? (own_query == &port->ip4_own_query) : 754 (own_query == &br->ip4_own_query)) { 755 other_query = &br->ip4_other_query; 756 br_group.proto = htons(ETH_P_IP); 757 #if IS_ENABLED(CONFIG_IPV6) 758 } else { 759 other_query = &br->ip6_other_query; 760 br_group.proto = htons(ETH_P_IPV6); 761 #endif 762 } 763 764 if (!other_query || timer_pending(&other_query->timer)) 765 return; 766 767 __br_multicast_send_query(br, port, &br_group); 768 769 time = jiffies; 770 time += own_query->startup_sent < br->multicast_startup_query_count ? 771 br->multicast_startup_query_interval : 772 br->multicast_query_interval; 773 mod_timer(&own_query->timer, time); 774 } 775 776 static void 777 br_multicast_port_query_expired(struct net_bridge_port *port, 778 struct bridge_mcast_own_query *query) 779 { 780 struct net_bridge *br = port->br; 781 782 spin_lock(&br->multicast_lock); 783 if (port->state == BR_STATE_DISABLED || 784 port->state == BR_STATE_BLOCKING) 785 goto out; 786 787 if (query->startup_sent < br->multicast_startup_query_count) 788 query->startup_sent++; 789 790 br_multicast_send_query(port->br, port, query); 791 792 out: 793 spin_unlock(&br->multicast_lock); 794 } 795 796 static void br_ip4_multicast_port_query_expired(struct timer_list *t) 797 { 798 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer); 799 800 br_multicast_port_query_expired(port, &port->ip4_own_query); 801 } 802 803 #if IS_ENABLED(CONFIG_IPV6) 804 static void br_ip6_multicast_port_query_expired(struct timer_list *t) 805 { 806 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer); 807 808 br_multicast_port_query_expired(port, &port->ip6_own_query); 809 } 810 #endif 811 812 static void br_mc_disabled_update(struct net_device *dev, bool value) 813 { 814 struct switchdev_attr attr = { 815 .orig_dev = dev, 816 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED, 817 .flags = SWITCHDEV_F_DEFER, 818 .u.mc_disabled = !value, 819 }; 820 821 switchdev_port_attr_set(dev, &attr); 822 } 823 824 int br_multicast_add_port(struct net_bridge_port *port) 825 { 826 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 827 828 timer_setup(&port->multicast_router_timer, 829 br_multicast_router_expired, 0); 830 timer_setup(&port->ip4_own_query.timer, 831 br_ip4_multicast_port_query_expired, 0); 832 #if IS_ENABLED(CONFIG_IPV6) 833 timer_setup(&port->ip6_own_query.timer, 834 br_ip6_multicast_port_query_expired, 0); 835 #endif 836 br_mc_disabled_update(port->dev, 837 br_opt_get(port->br, BROPT_MULTICAST_ENABLED)); 838 839 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 840 if (!port->mcast_stats) 841 return -ENOMEM; 842 843 return 0; 844 } 845 846 void br_multicast_del_port(struct net_bridge_port *port) 847 { 848 struct net_bridge *br = port->br; 849 struct net_bridge_port_group *pg; 850 struct hlist_node *n; 851 852 /* Take care of the remaining groups, only perm ones should be left */ 853 spin_lock_bh(&br->multicast_lock); 854 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 855 br_multicast_del_pg(br, pg); 856 spin_unlock_bh(&br->multicast_lock); 857 del_timer_sync(&port->multicast_router_timer); 858 free_percpu(port->mcast_stats); 859 } 860 861 static void br_multicast_enable(struct bridge_mcast_own_query *query) 862 { 863 query->startup_sent = 0; 864 865 if (try_to_del_timer_sync(&query->timer) >= 0 || 866 del_timer(&query->timer)) 867 mod_timer(&query->timer, jiffies); 868 } 869 870 static void __br_multicast_enable_port(struct net_bridge_port *port) 871 { 872 struct net_bridge *br = port->br; 873 874 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev)) 875 return; 876 877 br_multicast_enable(&port->ip4_own_query); 878 #if IS_ENABLED(CONFIG_IPV6) 879 br_multicast_enable(&port->ip6_own_query); 880 #endif 881 if (port->multicast_router == MDB_RTR_TYPE_PERM && 882 hlist_unhashed(&port->rlist)) 883 br_multicast_add_router(br, port); 884 } 885 886 void br_multicast_enable_port(struct net_bridge_port *port) 887 { 888 struct net_bridge *br = port->br; 889 890 spin_lock(&br->multicast_lock); 891 __br_multicast_enable_port(port); 892 spin_unlock(&br->multicast_lock); 893 } 894 895 void br_multicast_disable_port(struct net_bridge_port *port) 896 { 897 struct net_bridge *br = port->br; 898 struct net_bridge_port_group *pg; 899 struct hlist_node *n; 900 901 spin_lock(&br->multicast_lock); 902 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 903 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT)) 904 br_multicast_del_pg(br, pg); 905 906 __del_port_router(port); 907 908 del_timer(&port->multicast_router_timer); 909 del_timer(&port->ip4_own_query.timer); 910 #if IS_ENABLED(CONFIG_IPV6) 911 del_timer(&port->ip6_own_query.timer); 912 #endif 913 spin_unlock(&br->multicast_lock); 914 } 915 916 static int br_ip4_multicast_igmp3_report(struct net_bridge *br, 917 struct net_bridge_port *port, 918 struct sk_buff *skb, 919 u16 vid) 920 { 921 const unsigned char *src; 922 struct igmpv3_report *ih; 923 struct igmpv3_grec *grec; 924 int i; 925 int len; 926 int num; 927 int type; 928 int err = 0; 929 __be32 group; 930 u16 nsrcs; 931 932 ih = igmpv3_report_hdr(skb); 933 num = ntohs(ih->ngrec); 934 len = skb_transport_offset(skb) + sizeof(*ih); 935 936 for (i = 0; i < num; i++) { 937 len += sizeof(*grec); 938 if (!ip_mc_may_pull(skb, len)) 939 return -EINVAL; 940 941 grec = (void *)(skb->data + len - sizeof(*grec)); 942 group = grec->grec_mca; 943 type = grec->grec_type; 944 nsrcs = ntohs(grec->grec_nsrcs); 945 946 len += nsrcs * 4; 947 if (!ip_mc_may_pull(skb, len)) 948 return -EINVAL; 949 950 /* We treat this as an IGMPv2 report for now. */ 951 switch (type) { 952 case IGMPV3_MODE_IS_INCLUDE: 953 case IGMPV3_MODE_IS_EXCLUDE: 954 case IGMPV3_CHANGE_TO_INCLUDE: 955 case IGMPV3_CHANGE_TO_EXCLUDE: 956 case IGMPV3_ALLOW_NEW_SOURCES: 957 case IGMPV3_BLOCK_OLD_SOURCES: 958 break; 959 960 default: 961 continue; 962 } 963 964 src = eth_hdr(skb)->h_source; 965 if ((type == IGMPV3_CHANGE_TO_INCLUDE || 966 type == IGMPV3_MODE_IS_INCLUDE) && 967 nsrcs == 0) { 968 br_ip4_multicast_leave_group(br, port, group, vid, src); 969 } else { 970 err = br_ip4_multicast_add_group(br, port, group, vid, 971 src); 972 if (err) 973 break; 974 } 975 } 976 977 return err; 978 } 979 980 #if IS_ENABLED(CONFIG_IPV6) 981 static int br_ip6_multicast_mld2_report(struct net_bridge *br, 982 struct net_bridge_port *port, 983 struct sk_buff *skb, 984 u16 vid) 985 { 986 unsigned int nsrcs_offset; 987 const unsigned char *src; 988 struct icmp6hdr *icmp6h; 989 struct mld2_grec *grec; 990 unsigned int grec_len; 991 int i; 992 int len; 993 int num; 994 int err = 0; 995 996 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h))) 997 return -EINVAL; 998 999 icmp6h = icmp6_hdr(skb); 1000 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 1001 len = skb_transport_offset(skb) + sizeof(*icmp6h); 1002 1003 for (i = 0; i < num; i++) { 1004 __be16 *_nsrcs, __nsrcs; 1005 u16 nsrcs; 1006 1007 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs); 1008 1009 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < 1010 nsrcs_offset + sizeof(_nsrcs)) 1011 return -EINVAL; 1012 1013 _nsrcs = skb_header_pointer(skb, nsrcs_offset, 1014 sizeof(__nsrcs), &__nsrcs); 1015 if (!_nsrcs) 1016 return -EINVAL; 1017 1018 nsrcs = ntohs(*_nsrcs); 1019 grec_len = struct_size(grec, grec_src, nsrcs); 1020 1021 if (!ipv6_mc_may_pull(skb, len + grec_len)) 1022 return -EINVAL; 1023 1024 grec = (struct mld2_grec *)(skb->data + len); 1025 len += grec_len; 1026 1027 /* We treat these as MLDv1 reports for now. */ 1028 switch (grec->grec_type) { 1029 case MLD2_MODE_IS_INCLUDE: 1030 case MLD2_MODE_IS_EXCLUDE: 1031 case MLD2_CHANGE_TO_INCLUDE: 1032 case MLD2_CHANGE_TO_EXCLUDE: 1033 case MLD2_ALLOW_NEW_SOURCES: 1034 case MLD2_BLOCK_OLD_SOURCES: 1035 break; 1036 1037 default: 1038 continue; 1039 } 1040 1041 src = eth_hdr(skb)->h_source; 1042 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE || 1043 grec->grec_type == MLD2_MODE_IS_INCLUDE) && 1044 nsrcs == 0) { 1045 br_ip6_multicast_leave_group(br, port, &grec->grec_mca, 1046 vid, src); 1047 } else { 1048 err = br_ip6_multicast_add_group(br, port, 1049 &grec->grec_mca, vid, 1050 src); 1051 if (err) 1052 break; 1053 } 1054 } 1055 1056 return err; 1057 } 1058 #endif 1059 1060 static bool br_ip4_multicast_select_querier(struct net_bridge *br, 1061 struct net_bridge_port *port, 1062 __be32 saddr) 1063 { 1064 if (!timer_pending(&br->ip4_own_query.timer) && 1065 !timer_pending(&br->ip4_other_query.timer)) 1066 goto update; 1067 1068 if (!br->ip4_querier.addr.u.ip4) 1069 goto update; 1070 1071 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4)) 1072 goto update; 1073 1074 return false; 1075 1076 update: 1077 br->ip4_querier.addr.u.ip4 = saddr; 1078 1079 /* update protected by general multicast_lock by caller */ 1080 rcu_assign_pointer(br->ip4_querier.port, port); 1081 1082 return true; 1083 } 1084 1085 #if IS_ENABLED(CONFIG_IPV6) 1086 static bool br_ip6_multicast_select_querier(struct net_bridge *br, 1087 struct net_bridge_port *port, 1088 struct in6_addr *saddr) 1089 { 1090 if (!timer_pending(&br->ip6_own_query.timer) && 1091 !timer_pending(&br->ip6_other_query.timer)) 1092 goto update; 1093 1094 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0) 1095 goto update; 1096 1097 return false; 1098 1099 update: 1100 br->ip6_querier.addr.u.ip6 = *saddr; 1101 1102 /* update protected by general multicast_lock by caller */ 1103 rcu_assign_pointer(br->ip6_querier.port, port); 1104 1105 return true; 1106 } 1107 #endif 1108 1109 static bool br_multicast_select_querier(struct net_bridge *br, 1110 struct net_bridge_port *port, 1111 struct br_ip *saddr) 1112 { 1113 switch (saddr->proto) { 1114 case htons(ETH_P_IP): 1115 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4); 1116 #if IS_ENABLED(CONFIG_IPV6) 1117 case htons(ETH_P_IPV6): 1118 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6); 1119 #endif 1120 } 1121 1122 return false; 1123 } 1124 1125 static void 1126 br_multicast_update_query_timer(struct net_bridge *br, 1127 struct bridge_mcast_other_query *query, 1128 unsigned long max_delay) 1129 { 1130 if (!timer_pending(&query->timer)) 1131 query->delay_time = jiffies + max_delay; 1132 1133 mod_timer(&query->timer, jiffies + br->multicast_querier_interval); 1134 } 1135 1136 static void br_port_mc_router_state_change(struct net_bridge_port *p, 1137 bool is_mc_router) 1138 { 1139 struct switchdev_attr attr = { 1140 .orig_dev = p->dev, 1141 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER, 1142 .flags = SWITCHDEV_F_DEFER, 1143 .u.mrouter = is_mc_router, 1144 }; 1145 1146 switchdev_port_attr_set(p->dev, &attr); 1147 } 1148 1149 /* 1150 * Add port to router_list 1151 * list is maintained ordered by pointer value 1152 * and locked by br->multicast_lock and RCU 1153 */ 1154 static void br_multicast_add_router(struct net_bridge *br, 1155 struct net_bridge_port *port) 1156 { 1157 struct net_bridge_port *p; 1158 struct hlist_node *slot = NULL; 1159 1160 if (!hlist_unhashed(&port->rlist)) 1161 return; 1162 1163 hlist_for_each_entry(p, &br->router_list, rlist) { 1164 if ((unsigned long) port >= (unsigned long) p) 1165 break; 1166 slot = &p->rlist; 1167 } 1168 1169 if (slot) 1170 hlist_add_behind_rcu(&port->rlist, slot); 1171 else 1172 hlist_add_head_rcu(&port->rlist, &br->router_list); 1173 br_rtr_notify(br->dev, port, RTM_NEWMDB); 1174 br_port_mc_router_state_change(port, true); 1175 } 1176 1177 static void br_multicast_mark_router(struct net_bridge *br, 1178 struct net_bridge_port *port) 1179 { 1180 unsigned long now = jiffies; 1181 1182 if (!port) { 1183 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) { 1184 if (!timer_pending(&br->multicast_router_timer)) 1185 br_mc_router_state_change(br, true); 1186 mod_timer(&br->multicast_router_timer, 1187 now + br->multicast_querier_interval); 1188 } 1189 return; 1190 } 1191 1192 if (port->multicast_router == MDB_RTR_TYPE_DISABLED || 1193 port->multicast_router == MDB_RTR_TYPE_PERM) 1194 return; 1195 1196 br_multicast_add_router(br, port); 1197 1198 mod_timer(&port->multicast_router_timer, 1199 now + br->multicast_querier_interval); 1200 } 1201 1202 static void br_multicast_query_received(struct net_bridge *br, 1203 struct net_bridge_port *port, 1204 struct bridge_mcast_other_query *query, 1205 struct br_ip *saddr, 1206 unsigned long max_delay) 1207 { 1208 if (!br_multicast_select_querier(br, port, saddr)) 1209 return; 1210 1211 br_multicast_update_query_timer(br, query, max_delay); 1212 br_multicast_mark_router(br, port); 1213 } 1214 1215 static void br_ip4_multicast_query(struct net_bridge *br, 1216 struct net_bridge_port *port, 1217 struct sk_buff *skb, 1218 u16 vid) 1219 { 1220 unsigned int transport_len = ip_transport_len(skb); 1221 const struct iphdr *iph = ip_hdr(skb); 1222 struct igmphdr *ih = igmp_hdr(skb); 1223 struct net_bridge_mdb_entry *mp; 1224 struct igmpv3_query *ih3; 1225 struct net_bridge_port_group *p; 1226 struct net_bridge_port_group __rcu **pp; 1227 struct br_ip saddr; 1228 unsigned long max_delay; 1229 unsigned long now = jiffies; 1230 __be32 group; 1231 1232 spin_lock(&br->multicast_lock); 1233 if (!netif_running(br->dev) || 1234 (port && port->state == BR_STATE_DISABLED)) 1235 goto out; 1236 1237 group = ih->group; 1238 1239 if (transport_len == sizeof(*ih)) { 1240 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 1241 1242 if (!max_delay) { 1243 max_delay = 10 * HZ; 1244 group = 0; 1245 } 1246 } else if (transport_len >= sizeof(*ih3)) { 1247 ih3 = igmpv3_query_hdr(skb); 1248 if (ih3->nsrcs) 1249 goto out; 1250 1251 max_delay = ih3->code ? 1252 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 1253 } else { 1254 goto out; 1255 } 1256 1257 if (!group) { 1258 saddr.proto = htons(ETH_P_IP); 1259 saddr.u.ip4 = iph->saddr; 1260 1261 br_multicast_query_received(br, port, &br->ip4_other_query, 1262 &saddr, max_delay); 1263 goto out; 1264 } 1265 1266 mp = br_mdb_ip4_get(br, group, vid); 1267 if (!mp) 1268 goto out; 1269 1270 max_delay *= br->multicast_last_member_count; 1271 1272 if (mp->host_joined && 1273 (timer_pending(&mp->timer) ? 1274 time_after(mp->timer.expires, now + max_delay) : 1275 try_to_del_timer_sync(&mp->timer) >= 0)) 1276 mod_timer(&mp->timer, now + max_delay); 1277 1278 for (pp = &mp->ports; 1279 (p = mlock_dereference(*pp, br)) != NULL; 1280 pp = &p->next) { 1281 if (timer_pending(&p->timer) ? 1282 time_after(p->timer.expires, now + max_delay) : 1283 try_to_del_timer_sync(&p->timer) >= 0) 1284 mod_timer(&p->timer, now + max_delay); 1285 } 1286 1287 out: 1288 spin_unlock(&br->multicast_lock); 1289 } 1290 1291 #if IS_ENABLED(CONFIG_IPV6) 1292 static int br_ip6_multicast_query(struct net_bridge *br, 1293 struct net_bridge_port *port, 1294 struct sk_buff *skb, 1295 u16 vid) 1296 { 1297 unsigned int transport_len = ipv6_transport_len(skb); 1298 struct mld_msg *mld; 1299 struct net_bridge_mdb_entry *mp; 1300 struct mld2_query *mld2q; 1301 struct net_bridge_port_group *p; 1302 struct net_bridge_port_group __rcu **pp; 1303 struct br_ip saddr; 1304 unsigned long max_delay; 1305 unsigned long now = jiffies; 1306 unsigned int offset = skb_transport_offset(skb); 1307 const struct in6_addr *group = NULL; 1308 bool is_general_query; 1309 int err = 0; 1310 1311 spin_lock(&br->multicast_lock); 1312 if (!netif_running(br->dev) || 1313 (port && port->state == BR_STATE_DISABLED)) 1314 goto out; 1315 1316 if (transport_len == sizeof(*mld)) { 1317 if (!pskb_may_pull(skb, offset + sizeof(*mld))) { 1318 err = -EINVAL; 1319 goto out; 1320 } 1321 mld = (struct mld_msg *) icmp6_hdr(skb); 1322 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); 1323 if (max_delay) 1324 group = &mld->mld_mca; 1325 } else { 1326 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) { 1327 err = -EINVAL; 1328 goto out; 1329 } 1330 mld2q = (struct mld2_query *)icmp6_hdr(skb); 1331 if (!mld2q->mld2q_nsrcs) 1332 group = &mld2q->mld2q_mca; 1333 1334 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); 1335 } 1336 1337 is_general_query = group && ipv6_addr_any(group); 1338 1339 if (is_general_query) { 1340 saddr.proto = htons(ETH_P_IPV6); 1341 saddr.u.ip6 = ipv6_hdr(skb)->saddr; 1342 1343 br_multicast_query_received(br, port, &br->ip6_other_query, 1344 &saddr, max_delay); 1345 goto out; 1346 } else if (!group) { 1347 goto out; 1348 } 1349 1350 mp = br_mdb_ip6_get(br, group, vid); 1351 if (!mp) 1352 goto out; 1353 1354 max_delay *= br->multicast_last_member_count; 1355 if (mp->host_joined && 1356 (timer_pending(&mp->timer) ? 1357 time_after(mp->timer.expires, now + max_delay) : 1358 try_to_del_timer_sync(&mp->timer) >= 0)) 1359 mod_timer(&mp->timer, now + max_delay); 1360 1361 for (pp = &mp->ports; 1362 (p = mlock_dereference(*pp, br)) != NULL; 1363 pp = &p->next) { 1364 if (timer_pending(&p->timer) ? 1365 time_after(p->timer.expires, now + max_delay) : 1366 try_to_del_timer_sync(&p->timer) >= 0) 1367 mod_timer(&p->timer, now + max_delay); 1368 } 1369 1370 out: 1371 spin_unlock(&br->multicast_lock); 1372 return err; 1373 } 1374 #endif 1375 1376 static void 1377 br_multicast_leave_group(struct net_bridge *br, 1378 struct net_bridge_port *port, 1379 struct br_ip *group, 1380 struct bridge_mcast_other_query *other_query, 1381 struct bridge_mcast_own_query *own_query, 1382 const unsigned char *src) 1383 { 1384 struct net_bridge_mdb_entry *mp; 1385 struct net_bridge_port_group *p; 1386 unsigned long now; 1387 unsigned long time; 1388 1389 spin_lock(&br->multicast_lock); 1390 if (!netif_running(br->dev) || 1391 (port && port->state == BR_STATE_DISABLED)) 1392 goto out; 1393 1394 mp = br_mdb_ip_get(br, group); 1395 if (!mp) 1396 goto out; 1397 1398 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { 1399 struct net_bridge_port_group __rcu **pp; 1400 1401 for (pp = &mp->ports; 1402 (p = mlock_dereference(*pp, br)) != NULL; 1403 pp = &p->next) { 1404 if (!br_port_group_equal(p, port, src)) 1405 continue; 1406 1407 if (p->flags & MDB_PG_FLAGS_PERMANENT) 1408 break; 1409 1410 rcu_assign_pointer(*pp, p->next); 1411 hlist_del_init(&p->mglist); 1412 del_timer(&p->timer); 1413 kfree_rcu(p, rcu); 1414 br_mdb_notify(br->dev, port, group, RTM_DELMDB, 1415 p->flags | MDB_PG_FLAGS_FAST_LEAVE); 1416 1417 if (!mp->ports && !mp->host_joined && 1418 netif_running(br->dev)) 1419 mod_timer(&mp->timer, jiffies); 1420 } 1421 goto out; 1422 } 1423 1424 if (timer_pending(&other_query->timer)) 1425 goto out; 1426 1427 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) { 1428 __br_multicast_send_query(br, port, &mp->addr); 1429 1430 time = jiffies + br->multicast_last_member_count * 1431 br->multicast_last_member_interval; 1432 1433 mod_timer(&own_query->timer, time); 1434 1435 for (p = mlock_dereference(mp->ports, br); 1436 p != NULL; 1437 p = mlock_dereference(p->next, br)) { 1438 if (!br_port_group_equal(p, port, src)) 1439 continue; 1440 1441 if (!hlist_unhashed(&p->mglist) && 1442 (timer_pending(&p->timer) ? 1443 time_after(p->timer.expires, time) : 1444 try_to_del_timer_sync(&p->timer) >= 0)) { 1445 mod_timer(&p->timer, time); 1446 } 1447 1448 break; 1449 } 1450 } 1451 1452 now = jiffies; 1453 time = now + br->multicast_last_member_count * 1454 br->multicast_last_member_interval; 1455 1456 if (!port) { 1457 if (mp->host_joined && 1458 (timer_pending(&mp->timer) ? 1459 time_after(mp->timer.expires, time) : 1460 try_to_del_timer_sync(&mp->timer) >= 0)) { 1461 mod_timer(&mp->timer, time); 1462 } 1463 1464 goto out; 1465 } 1466 1467 for (p = mlock_dereference(mp->ports, br); 1468 p != NULL; 1469 p = mlock_dereference(p->next, br)) { 1470 if (p->port != port) 1471 continue; 1472 1473 if (!hlist_unhashed(&p->mglist) && 1474 (timer_pending(&p->timer) ? 1475 time_after(p->timer.expires, time) : 1476 try_to_del_timer_sync(&p->timer) >= 0)) { 1477 mod_timer(&p->timer, time); 1478 } 1479 1480 break; 1481 } 1482 out: 1483 spin_unlock(&br->multicast_lock); 1484 } 1485 1486 static void br_ip4_multicast_leave_group(struct net_bridge *br, 1487 struct net_bridge_port *port, 1488 __be32 group, 1489 __u16 vid, 1490 const unsigned char *src) 1491 { 1492 struct br_ip br_group; 1493 struct bridge_mcast_own_query *own_query; 1494 1495 if (ipv4_is_local_multicast(group)) 1496 return; 1497 1498 own_query = port ? &port->ip4_own_query : &br->ip4_own_query; 1499 1500 memset(&br_group, 0, sizeof(br_group)); 1501 br_group.u.ip4 = group; 1502 br_group.proto = htons(ETH_P_IP); 1503 br_group.vid = vid; 1504 1505 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query, 1506 own_query, src); 1507 } 1508 1509 #if IS_ENABLED(CONFIG_IPV6) 1510 static void br_ip6_multicast_leave_group(struct net_bridge *br, 1511 struct net_bridge_port *port, 1512 const struct in6_addr *group, 1513 __u16 vid, 1514 const unsigned char *src) 1515 { 1516 struct br_ip br_group; 1517 struct bridge_mcast_own_query *own_query; 1518 1519 if (ipv6_addr_is_ll_all_nodes(group)) 1520 return; 1521 1522 own_query = port ? &port->ip6_own_query : &br->ip6_own_query; 1523 1524 memset(&br_group, 0, sizeof(br_group)); 1525 br_group.u.ip6 = *group; 1526 br_group.proto = htons(ETH_P_IPV6); 1527 br_group.vid = vid; 1528 1529 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query, 1530 own_query, src); 1531 } 1532 #endif 1533 1534 static void br_multicast_err_count(const struct net_bridge *br, 1535 const struct net_bridge_port *p, 1536 __be16 proto) 1537 { 1538 struct bridge_mcast_stats __percpu *stats; 1539 struct bridge_mcast_stats *pstats; 1540 1541 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 1542 return; 1543 1544 if (p) 1545 stats = p->mcast_stats; 1546 else 1547 stats = br->mcast_stats; 1548 if (WARN_ON(!stats)) 1549 return; 1550 1551 pstats = this_cpu_ptr(stats); 1552 1553 u64_stats_update_begin(&pstats->syncp); 1554 switch (proto) { 1555 case htons(ETH_P_IP): 1556 pstats->mstats.igmp_parse_errors++; 1557 break; 1558 #if IS_ENABLED(CONFIG_IPV6) 1559 case htons(ETH_P_IPV6): 1560 pstats->mstats.mld_parse_errors++; 1561 break; 1562 #endif 1563 } 1564 u64_stats_update_end(&pstats->syncp); 1565 } 1566 1567 static void br_multicast_pim(struct net_bridge *br, 1568 struct net_bridge_port *port, 1569 const struct sk_buff *skb) 1570 { 1571 unsigned int offset = skb_transport_offset(skb); 1572 struct pimhdr *pimhdr, _pimhdr; 1573 1574 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr); 1575 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION || 1576 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO) 1577 return; 1578 1579 br_multicast_mark_router(br, port); 1580 } 1581 1582 static int br_ip4_multicast_mrd_rcv(struct net_bridge *br, 1583 struct net_bridge_port *port, 1584 struct sk_buff *skb) 1585 { 1586 if (ip_hdr(skb)->protocol != IPPROTO_IGMP || 1587 igmp_hdr(skb)->type != IGMP_MRDISC_ADV) 1588 return -ENOMSG; 1589 1590 br_multicast_mark_router(br, port); 1591 1592 return 0; 1593 } 1594 1595 static int br_multicast_ipv4_rcv(struct net_bridge *br, 1596 struct net_bridge_port *port, 1597 struct sk_buff *skb, 1598 u16 vid) 1599 { 1600 const unsigned char *src; 1601 struct igmphdr *ih; 1602 int err; 1603 1604 err = ip_mc_check_igmp(skb); 1605 1606 if (err == -ENOMSG) { 1607 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) { 1608 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1609 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) { 1610 if (ip_hdr(skb)->protocol == IPPROTO_PIM) 1611 br_multicast_pim(br, port, skb); 1612 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) { 1613 br_ip4_multicast_mrd_rcv(br, port, skb); 1614 } 1615 1616 return 0; 1617 } else if (err < 0) { 1618 br_multicast_err_count(br, port, skb->protocol); 1619 return err; 1620 } 1621 1622 ih = igmp_hdr(skb); 1623 src = eth_hdr(skb)->h_source; 1624 BR_INPUT_SKB_CB(skb)->igmp = ih->type; 1625 1626 switch (ih->type) { 1627 case IGMP_HOST_MEMBERSHIP_REPORT: 1628 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1629 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1630 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src); 1631 break; 1632 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1633 err = br_ip4_multicast_igmp3_report(br, port, skb, vid); 1634 break; 1635 case IGMP_HOST_MEMBERSHIP_QUERY: 1636 br_ip4_multicast_query(br, port, skb, vid); 1637 break; 1638 case IGMP_HOST_LEAVE_MESSAGE: 1639 br_ip4_multicast_leave_group(br, port, ih->group, vid, src); 1640 break; 1641 } 1642 1643 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp, 1644 BR_MCAST_DIR_RX); 1645 1646 return err; 1647 } 1648 1649 #if IS_ENABLED(CONFIG_IPV6) 1650 static int br_ip6_multicast_mrd_rcv(struct net_bridge *br, 1651 struct net_bridge_port *port, 1652 struct sk_buff *skb) 1653 { 1654 int ret; 1655 1656 if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6) 1657 return -ENOMSG; 1658 1659 ret = ipv6_mc_check_icmpv6(skb); 1660 if (ret < 0) 1661 return ret; 1662 1663 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV) 1664 return -ENOMSG; 1665 1666 br_multicast_mark_router(br, port); 1667 1668 return 0; 1669 } 1670 1671 static int br_multicast_ipv6_rcv(struct net_bridge *br, 1672 struct net_bridge_port *port, 1673 struct sk_buff *skb, 1674 u16 vid) 1675 { 1676 const unsigned char *src; 1677 struct mld_msg *mld; 1678 int err; 1679 1680 err = ipv6_mc_check_mld(skb); 1681 1682 if (err == -ENOMSG) { 1683 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr)) 1684 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1685 1686 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) { 1687 err = br_ip6_multicast_mrd_rcv(br, port, skb); 1688 1689 if (err < 0 && err != -ENOMSG) { 1690 br_multicast_err_count(br, port, skb->protocol); 1691 return err; 1692 } 1693 } 1694 1695 return 0; 1696 } else if (err < 0) { 1697 br_multicast_err_count(br, port, skb->protocol); 1698 return err; 1699 } 1700 1701 mld = (struct mld_msg *)skb_transport_header(skb); 1702 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type; 1703 1704 switch (mld->mld_type) { 1705 case ICMPV6_MGM_REPORT: 1706 src = eth_hdr(skb)->h_source; 1707 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1708 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid, 1709 src); 1710 break; 1711 case ICMPV6_MLD2_REPORT: 1712 err = br_ip6_multicast_mld2_report(br, port, skb, vid); 1713 break; 1714 case ICMPV6_MGM_QUERY: 1715 err = br_ip6_multicast_query(br, port, skb, vid); 1716 break; 1717 case ICMPV6_MGM_REDUCTION: 1718 src = eth_hdr(skb)->h_source; 1719 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src); 1720 break; 1721 } 1722 1723 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp, 1724 BR_MCAST_DIR_RX); 1725 1726 return err; 1727 } 1728 #endif 1729 1730 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 1731 struct sk_buff *skb, u16 vid) 1732 { 1733 int ret = 0; 1734 1735 BR_INPUT_SKB_CB(skb)->igmp = 0; 1736 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 1737 1738 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1739 return 0; 1740 1741 switch (skb->protocol) { 1742 case htons(ETH_P_IP): 1743 ret = br_multicast_ipv4_rcv(br, port, skb, vid); 1744 break; 1745 #if IS_ENABLED(CONFIG_IPV6) 1746 case htons(ETH_P_IPV6): 1747 ret = br_multicast_ipv6_rcv(br, port, skb, vid); 1748 break; 1749 #endif 1750 } 1751 1752 return ret; 1753 } 1754 1755 static void br_multicast_query_expired(struct net_bridge *br, 1756 struct bridge_mcast_own_query *query, 1757 struct bridge_mcast_querier *querier) 1758 { 1759 spin_lock(&br->multicast_lock); 1760 if (query->startup_sent < br->multicast_startup_query_count) 1761 query->startup_sent++; 1762 1763 RCU_INIT_POINTER(querier->port, NULL); 1764 br_multicast_send_query(br, NULL, query); 1765 spin_unlock(&br->multicast_lock); 1766 } 1767 1768 static void br_ip4_multicast_query_expired(struct timer_list *t) 1769 { 1770 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer); 1771 1772 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier); 1773 } 1774 1775 #if IS_ENABLED(CONFIG_IPV6) 1776 static void br_ip6_multicast_query_expired(struct timer_list *t) 1777 { 1778 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer); 1779 1780 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier); 1781 } 1782 #endif 1783 1784 void br_multicast_init(struct net_bridge *br) 1785 { 1786 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX; 1787 1788 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1789 br->multicast_last_member_count = 2; 1790 br->multicast_startup_query_count = 2; 1791 1792 br->multicast_last_member_interval = HZ; 1793 br->multicast_query_response_interval = 10 * HZ; 1794 br->multicast_startup_query_interval = 125 * HZ / 4; 1795 br->multicast_query_interval = 125 * HZ; 1796 br->multicast_querier_interval = 255 * HZ; 1797 br->multicast_membership_interval = 260 * HZ; 1798 1799 br->ip4_other_query.delay_time = 0; 1800 br->ip4_querier.port = NULL; 1801 br->multicast_igmp_version = 2; 1802 #if IS_ENABLED(CONFIG_IPV6) 1803 br->multicast_mld_version = 1; 1804 br->ip6_other_query.delay_time = 0; 1805 br->ip6_querier.port = NULL; 1806 #endif 1807 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true); 1808 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true); 1809 1810 spin_lock_init(&br->multicast_lock); 1811 timer_setup(&br->multicast_router_timer, 1812 br_multicast_local_router_expired, 0); 1813 timer_setup(&br->ip4_other_query.timer, 1814 br_ip4_multicast_querier_expired, 0); 1815 timer_setup(&br->ip4_own_query.timer, 1816 br_ip4_multicast_query_expired, 0); 1817 #if IS_ENABLED(CONFIG_IPV6) 1818 timer_setup(&br->ip6_other_query.timer, 1819 br_ip6_multicast_querier_expired, 0); 1820 timer_setup(&br->ip6_own_query.timer, 1821 br_ip6_multicast_query_expired, 0); 1822 #endif 1823 INIT_HLIST_HEAD(&br->mdb_list); 1824 } 1825 1826 static void br_ip4_multicast_join_snoopers(struct net_bridge *br) 1827 { 1828 struct in_device *in_dev = in_dev_get(br->dev); 1829 1830 if (!in_dev) 1831 return; 1832 1833 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 1834 in_dev_put(in_dev); 1835 } 1836 1837 #if IS_ENABLED(CONFIG_IPV6) 1838 static void br_ip6_multicast_join_snoopers(struct net_bridge *br) 1839 { 1840 struct in6_addr addr; 1841 1842 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 1843 ipv6_dev_mc_inc(br->dev, &addr); 1844 } 1845 #else 1846 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br) 1847 { 1848 } 1849 #endif 1850 1851 static void br_multicast_join_snoopers(struct net_bridge *br) 1852 { 1853 br_ip4_multicast_join_snoopers(br); 1854 br_ip6_multicast_join_snoopers(br); 1855 } 1856 1857 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br) 1858 { 1859 struct in_device *in_dev = in_dev_get(br->dev); 1860 1861 if (WARN_ON(!in_dev)) 1862 return; 1863 1864 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 1865 in_dev_put(in_dev); 1866 } 1867 1868 #if IS_ENABLED(CONFIG_IPV6) 1869 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 1870 { 1871 struct in6_addr addr; 1872 1873 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 1874 ipv6_dev_mc_dec(br->dev, &addr); 1875 } 1876 #else 1877 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 1878 { 1879 } 1880 #endif 1881 1882 static void br_multicast_leave_snoopers(struct net_bridge *br) 1883 { 1884 br_ip4_multicast_leave_snoopers(br); 1885 br_ip6_multicast_leave_snoopers(br); 1886 } 1887 1888 static void __br_multicast_open(struct net_bridge *br, 1889 struct bridge_mcast_own_query *query) 1890 { 1891 query->startup_sent = 0; 1892 1893 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1894 return; 1895 1896 mod_timer(&query->timer, jiffies); 1897 } 1898 1899 void br_multicast_open(struct net_bridge *br) 1900 { 1901 if (br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1902 br_multicast_join_snoopers(br); 1903 1904 __br_multicast_open(br, &br->ip4_own_query); 1905 #if IS_ENABLED(CONFIG_IPV6) 1906 __br_multicast_open(br, &br->ip6_own_query); 1907 #endif 1908 } 1909 1910 void br_multicast_stop(struct net_bridge *br) 1911 { 1912 del_timer_sync(&br->multicast_router_timer); 1913 del_timer_sync(&br->ip4_other_query.timer); 1914 del_timer_sync(&br->ip4_own_query.timer); 1915 #if IS_ENABLED(CONFIG_IPV6) 1916 del_timer_sync(&br->ip6_other_query.timer); 1917 del_timer_sync(&br->ip6_own_query.timer); 1918 #endif 1919 1920 if (br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1921 br_multicast_leave_snoopers(br); 1922 } 1923 1924 void br_multicast_dev_del(struct net_bridge *br) 1925 { 1926 struct net_bridge_mdb_entry *mp; 1927 struct hlist_node *tmp; 1928 1929 spin_lock_bh(&br->multicast_lock); 1930 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) { 1931 del_timer(&mp->timer); 1932 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode, 1933 br_mdb_rht_params); 1934 hlist_del_rcu(&mp->mdb_node); 1935 kfree_rcu(mp, rcu); 1936 } 1937 spin_unlock_bh(&br->multicast_lock); 1938 1939 rcu_barrier(); 1940 } 1941 1942 int br_multicast_set_router(struct net_bridge *br, unsigned long val) 1943 { 1944 int err = -EINVAL; 1945 1946 spin_lock_bh(&br->multicast_lock); 1947 1948 switch (val) { 1949 case MDB_RTR_TYPE_DISABLED: 1950 case MDB_RTR_TYPE_PERM: 1951 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM); 1952 del_timer(&br->multicast_router_timer); 1953 br->multicast_router = val; 1954 err = 0; 1955 break; 1956 case MDB_RTR_TYPE_TEMP_QUERY: 1957 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY) 1958 br_mc_router_state_change(br, false); 1959 br->multicast_router = val; 1960 err = 0; 1961 break; 1962 } 1963 1964 spin_unlock_bh(&br->multicast_lock); 1965 1966 return err; 1967 } 1968 1969 static void __del_port_router(struct net_bridge_port *p) 1970 { 1971 if (hlist_unhashed(&p->rlist)) 1972 return; 1973 hlist_del_init_rcu(&p->rlist); 1974 br_rtr_notify(p->br->dev, p, RTM_DELMDB); 1975 br_port_mc_router_state_change(p, false); 1976 1977 /* don't allow timer refresh */ 1978 if (p->multicast_router == MDB_RTR_TYPE_TEMP) 1979 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1980 } 1981 1982 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) 1983 { 1984 struct net_bridge *br = p->br; 1985 unsigned long now = jiffies; 1986 int err = -EINVAL; 1987 1988 spin_lock(&br->multicast_lock); 1989 if (p->multicast_router == val) { 1990 /* Refresh the temp router port timer */ 1991 if (p->multicast_router == MDB_RTR_TYPE_TEMP) 1992 mod_timer(&p->multicast_router_timer, 1993 now + br->multicast_querier_interval); 1994 err = 0; 1995 goto unlock; 1996 } 1997 switch (val) { 1998 case MDB_RTR_TYPE_DISABLED: 1999 p->multicast_router = MDB_RTR_TYPE_DISABLED; 2000 __del_port_router(p); 2001 del_timer(&p->multicast_router_timer); 2002 break; 2003 case MDB_RTR_TYPE_TEMP_QUERY: 2004 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 2005 __del_port_router(p); 2006 break; 2007 case MDB_RTR_TYPE_PERM: 2008 p->multicast_router = MDB_RTR_TYPE_PERM; 2009 del_timer(&p->multicast_router_timer); 2010 br_multicast_add_router(br, p); 2011 break; 2012 case MDB_RTR_TYPE_TEMP: 2013 p->multicast_router = MDB_RTR_TYPE_TEMP; 2014 br_multicast_mark_router(br, p); 2015 break; 2016 default: 2017 goto unlock; 2018 } 2019 err = 0; 2020 unlock: 2021 spin_unlock(&br->multicast_lock); 2022 2023 return err; 2024 } 2025 2026 static void br_multicast_start_querier(struct net_bridge *br, 2027 struct bridge_mcast_own_query *query) 2028 { 2029 struct net_bridge_port *port; 2030 2031 __br_multicast_open(br, query); 2032 2033 rcu_read_lock(); 2034 list_for_each_entry_rcu(port, &br->port_list, list) { 2035 if (port->state == BR_STATE_DISABLED || 2036 port->state == BR_STATE_BLOCKING) 2037 continue; 2038 2039 if (query == &br->ip4_own_query) 2040 br_multicast_enable(&port->ip4_own_query); 2041 #if IS_ENABLED(CONFIG_IPV6) 2042 else 2043 br_multicast_enable(&port->ip6_own_query); 2044 #endif 2045 } 2046 rcu_read_unlock(); 2047 } 2048 2049 int br_multicast_toggle(struct net_bridge *br, unsigned long val) 2050 { 2051 struct net_bridge_port *port; 2052 2053 spin_lock_bh(&br->multicast_lock); 2054 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val) 2055 goto unlock; 2056 2057 br_mc_disabled_update(br->dev, val); 2058 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val); 2059 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) { 2060 br_multicast_leave_snoopers(br); 2061 goto unlock; 2062 } 2063 2064 if (!netif_running(br->dev)) 2065 goto unlock; 2066 2067 br_multicast_open(br); 2068 list_for_each_entry(port, &br->port_list, list) 2069 __br_multicast_enable_port(port); 2070 2071 unlock: 2072 spin_unlock_bh(&br->multicast_lock); 2073 2074 return 0; 2075 } 2076 2077 bool br_multicast_enabled(const struct net_device *dev) 2078 { 2079 struct net_bridge *br = netdev_priv(dev); 2080 2081 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED); 2082 } 2083 EXPORT_SYMBOL_GPL(br_multicast_enabled); 2084 2085 bool br_multicast_router(const struct net_device *dev) 2086 { 2087 struct net_bridge *br = netdev_priv(dev); 2088 bool is_router; 2089 2090 spin_lock_bh(&br->multicast_lock); 2091 is_router = br_multicast_is_router(br); 2092 spin_unlock_bh(&br->multicast_lock); 2093 return is_router; 2094 } 2095 EXPORT_SYMBOL_GPL(br_multicast_router); 2096 2097 int br_multicast_set_querier(struct net_bridge *br, unsigned long val) 2098 { 2099 unsigned long max_delay; 2100 2101 val = !!val; 2102 2103 spin_lock_bh(&br->multicast_lock); 2104 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val) 2105 goto unlock; 2106 2107 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val); 2108 if (!val) 2109 goto unlock; 2110 2111 max_delay = br->multicast_query_response_interval; 2112 2113 if (!timer_pending(&br->ip4_other_query.timer)) 2114 br->ip4_other_query.delay_time = jiffies + max_delay; 2115 2116 br_multicast_start_querier(br, &br->ip4_own_query); 2117 2118 #if IS_ENABLED(CONFIG_IPV6) 2119 if (!timer_pending(&br->ip6_other_query.timer)) 2120 br->ip6_other_query.delay_time = jiffies + max_delay; 2121 2122 br_multicast_start_querier(br, &br->ip6_own_query); 2123 #endif 2124 2125 unlock: 2126 spin_unlock_bh(&br->multicast_lock); 2127 2128 return 0; 2129 } 2130 2131 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val) 2132 { 2133 /* Currently we support only version 2 and 3 */ 2134 switch (val) { 2135 case 2: 2136 case 3: 2137 break; 2138 default: 2139 return -EINVAL; 2140 } 2141 2142 spin_lock_bh(&br->multicast_lock); 2143 br->multicast_igmp_version = val; 2144 spin_unlock_bh(&br->multicast_lock); 2145 2146 return 0; 2147 } 2148 2149 #if IS_ENABLED(CONFIG_IPV6) 2150 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val) 2151 { 2152 /* Currently we support version 1 and 2 */ 2153 switch (val) { 2154 case 1: 2155 case 2: 2156 break; 2157 default: 2158 return -EINVAL; 2159 } 2160 2161 spin_lock_bh(&br->multicast_lock); 2162 br->multicast_mld_version = val; 2163 spin_unlock_bh(&br->multicast_lock); 2164 2165 return 0; 2166 } 2167 #endif 2168 2169 /** 2170 * br_multicast_list_adjacent - Returns snooped multicast addresses 2171 * @dev: The bridge port adjacent to which to retrieve addresses 2172 * @br_ip_list: The list to store found, snooped multicast IP addresses in 2173 * 2174 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast 2175 * snooping feature on all bridge ports of dev's bridge device, excluding 2176 * the addresses from dev itself. 2177 * 2178 * Returns the number of items added to br_ip_list. 2179 * 2180 * Notes: 2181 * - br_ip_list needs to be initialized by caller 2182 * - br_ip_list might contain duplicates in the end 2183 * (needs to be taken care of by caller) 2184 * - br_ip_list needs to be freed by caller 2185 */ 2186 int br_multicast_list_adjacent(struct net_device *dev, 2187 struct list_head *br_ip_list) 2188 { 2189 struct net_bridge *br; 2190 struct net_bridge_port *port; 2191 struct net_bridge_port_group *group; 2192 struct br_ip_list *entry; 2193 int count = 0; 2194 2195 rcu_read_lock(); 2196 if (!br_ip_list || !netif_is_bridge_port(dev)) 2197 goto unlock; 2198 2199 port = br_port_get_rcu(dev); 2200 if (!port || !port->br) 2201 goto unlock; 2202 2203 br = port->br; 2204 2205 list_for_each_entry_rcu(port, &br->port_list, list) { 2206 if (!port->dev || port->dev == dev) 2207 continue; 2208 2209 hlist_for_each_entry_rcu(group, &port->mglist, mglist) { 2210 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 2211 if (!entry) 2212 goto unlock; 2213 2214 entry->addr = group->addr; 2215 list_add(&entry->list, br_ip_list); 2216 count++; 2217 } 2218 } 2219 2220 unlock: 2221 rcu_read_unlock(); 2222 return count; 2223 } 2224 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); 2225 2226 /** 2227 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge 2228 * @dev: The bridge port providing the bridge on which to check for a querier 2229 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 2230 * 2231 * Checks whether the given interface has a bridge on top and if so returns 2232 * true if a valid querier exists anywhere on the bridged link layer. 2233 * Otherwise returns false. 2234 */ 2235 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto) 2236 { 2237 struct net_bridge *br; 2238 struct net_bridge_port *port; 2239 struct ethhdr eth; 2240 bool ret = false; 2241 2242 rcu_read_lock(); 2243 if (!netif_is_bridge_port(dev)) 2244 goto unlock; 2245 2246 port = br_port_get_rcu(dev); 2247 if (!port || !port->br) 2248 goto unlock; 2249 2250 br = port->br; 2251 2252 memset(ð, 0, sizeof(eth)); 2253 eth.h_proto = htons(proto); 2254 2255 ret = br_multicast_querier_exists(br, ð); 2256 2257 unlock: 2258 rcu_read_unlock(); 2259 return ret; 2260 } 2261 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere); 2262 2263 /** 2264 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port 2265 * @dev: The bridge port adjacent to which to check for a querier 2266 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 2267 * 2268 * Checks whether the given interface has a bridge on top and if so returns 2269 * true if a selected querier is behind one of the other ports of this 2270 * bridge. Otherwise returns false. 2271 */ 2272 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) 2273 { 2274 struct net_bridge *br; 2275 struct net_bridge_port *port; 2276 bool ret = false; 2277 2278 rcu_read_lock(); 2279 if (!netif_is_bridge_port(dev)) 2280 goto unlock; 2281 2282 port = br_port_get_rcu(dev); 2283 if (!port || !port->br) 2284 goto unlock; 2285 2286 br = port->br; 2287 2288 switch (proto) { 2289 case ETH_P_IP: 2290 if (!timer_pending(&br->ip4_other_query.timer) || 2291 rcu_dereference(br->ip4_querier.port) == port) 2292 goto unlock; 2293 break; 2294 #if IS_ENABLED(CONFIG_IPV6) 2295 case ETH_P_IPV6: 2296 if (!timer_pending(&br->ip6_other_query.timer) || 2297 rcu_dereference(br->ip6_querier.port) == port) 2298 goto unlock; 2299 break; 2300 #endif 2301 default: 2302 goto unlock; 2303 } 2304 2305 ret = true; 2306 unlock: 2307 rcu_read_unlock(); 2308 return ret; 2309 } 2310 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); 2311 2312 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats, 2313 const struct sk_buff *skb, u8 type, u8 dir) 2314 { 2315 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats); 2316 __be16 proto = skb->protocol; 2317 unsigned int t_len; 2318 2319 u64_stats_update_begin(&pstats->syncp); 2320 switch (proto) { 2321 case htons(ETH_P_IP): 2322 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); 2323 switch (type) { 2324 case IGMP_HOST_MEMBERSHIP_REPORT: 2325 pstats->mstats.igmp_v1reports[dir]++; 2326 break; 2327 case IGMPV2_HOST_MEMBERSHIP_REPORT: 2328 pstats->mstats.igmp_v2reports[dir]++; 2329 break; 2330 case IGMPV3_HOST_MEMBERSHIP_REPORT: 2331 pstats->mstats.igmp_v3reports[dir]++; 2332 break; 2333 case IGMP_HOST_MEMBERSHIP_QUERY: 2334 if (t_len != sizeof(struct igmphdr)) { 2335 pstats->mstats.igmp_v3queries[dir]++; 2336 } else { 2337 unsigned int offset = skb_transport_offset(skb); 2338 struct igmphdr *ih, _ihdr; 2339 2340 ih = skb_header_pointer(skb, offset, 2341 sizeof(_ihdr), &_ihdr); 2342 if (!ih) 2343 break; 2344 if (!ih->code) 2345 pstats->mstats.igmp_v1queries[dir]++; 2346 else 2347 pstats->mstats.igmp_v2queries[dir]++; 2348 } 2349 break; 2350 case IGMP_HOST_LEAVE_MESSAGE: 2351 pstats->mstats.igmp_leaves[dir]++; 2352 break; 2353 } 2354 break; 2355 #if IS_ENABLED(CONFIG_IPV6) 2356 case htons(ETH_P_IPV6): 2357 t_len = ntohs(ipv6_hdr(skb)->payload_len) + 2358 sizeof(struct ipv6hdr); 2359 t_len -= skb_network_header_len(skb); 2360 switch (type) { 2361 case ICMPV6_MGM_REPORT: 2362 pstats->mstats.mld_v1reports[dir]++; 2363 break; 2364 case ICMPV6_MLD2_REPORT: 2365 pstats->mstats.mld_v2reports[dir]++; 2366 break; 2367 case ICMPV6_MGM_QUERY: 2368 if (t_len != sizeof(struct mld_msg)) 2369 pstats->mstats.mld_v2queries[dir]++; 2370 else 2371 pstats->mstats.mld_v1queries[dir]++; 2372 break; 2373 case ICMPV6_MGM_REDUCTION: 2374 pstats->mstats.mld_leaves[dir]++; 2375 break; 2376 } 2377 break; 2378 #endif /* CONFIG_IPV6 */ 2379 } 2380 u64_stats_update_end(&pstats->syncp); 2381 } 2382 2383 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 2384 const struct sk_buff *skb, u8 type, u8 dir) 2385 { 2386 struct bridge_mcast_stats __percpu *stats; 2387 2388 /* if multicast_disabled is true then igmp type can't be set */ 2389 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 2390 return; 2391 2392 if (p) 2393 stats = p->mcast_stats; 2394 else 2395 stats = br->mcast_stats; 2396 if (WARN_ON(!stats)) 2397 return; 2398 2399 br_mcast_stats_add(stats, skb, type, dir); 2400 } 2401 2402 int br_multicast_init_stats(struct net_bridge *br) 2403 { 2404 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 2405 if (!br->mcast_stats) 2406 return -ENOMEM; 2407 2408 return 0; 2409 } 2410 2411 void br_multicast_uninit_stats(struct net_bridge *br) 2412 { 2413 free_percpu(br->mcast_stats); 2414 } 2415 2416 /* noinline for https://bugs.llvm.org/show_bug.cgi?id=45802#c9 */ 2417 static noinline_for_stack void mcast_stats_add_dir(u64 *dst, u64 *src) 2418 { 2419 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX]; 2420 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX]; 2421 } 2422 2423 void br_multicast_get_stats(const struct net_bridge *br, 2424 const struct net_bridge_port *p, 2425 struct br_mcast_stats *dest) 2426 { 2427 struct bridge_mcast_stats __percpu *stats; 2428 struct br_mcast_stats tdst; 2429 int i; 2430 2431 memset(dest, 0, sizeof(*dest)); 2432 if (p) 2433 stats = p->mcast_stats; 2434 else 2435 stats = br->mcast_stats; 2436 if (WARN_ON(!stats)) 2437 return; 2438 2439 memset(&tdst, 0, sizeof(tdst)); 2440 for_each_possible_cpu(i) { 2441 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i); 2442 struct br_mcast_stats temp; 2443 unsigned int start; 2444 2445 do { 2446 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); 2447 memcpy(&temp, &cpu_stats->mstats, sizeof(temp)); 2448 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); 2449 2450 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries); 2451 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries); 2452 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries); 2453 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves); 2454 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports); 2455 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports); 2456 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports); 2457 tdst.igmp_parse_errors += temp.igmp_parse_errors; 2458 2459 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries); 2460 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries); 2461 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves); 2462 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports); 2463 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports); 2464 tdst.mld_parse_errors += temp.mld_parse_errors; 2465 } 2466 memcpy(dest, &tdst, sizeof(*dest)); 2467 } 2468 2469 int br_mdb_hash_init(struct net_bridge *br) 2470 { 2471 return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params); 2472 } 2473 2474 void br_mdb_hash_fini(struct net_bridge *br) 2475 { 2476 rhashtable_destroy(&br->mdb_hash_tbl); 2477 } 2478