1 /* 2 * Bridge multicast support. 3 * 4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the Free 8 * Software Foundation; either version 2 of the License, or (at your option) 9 * any later version. 10 * 11 */ 12 13 #include <linux/err.h> 14 #include <linux/if_ether.h> 15 #include <linux/igmp.h> 16 #include <linux/jhash.h> 17 #include <linux/kernel.h> 18 #include <linux/log2.h> 19 #include <linux/netdevice.h> 20 #include <linux/netfilter_bridge.h> 21 #include <linux/random.h> 22 #include <linux/rculist.h> 23 #include <linux/skbuff.h> 24 #include <linux/slab.h> 25 #include <linux/timer.h> 26 #include <net/ip.h> 27 #if IS_ENABLED(CONFIG_IPV6) 28 #include <net/ipv6.h> 29 #include <net/mld.h> 30 #include <net/addrconf.h> 31 #include <net/ip6_checksum.h> 32 #endif 33 34 #include "br_private.h" 35 36 #define mlock_dereference(X, br) \ 37 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 38 39 static void br_multicast_start_querier(struct net_bridge *br); 40 41 #if IS_ENABLED(CONFIG_IPV6) 42 static inline int ipv6_is_transient_multicast(const struct in6_addr *addr) 43 { 44 if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr)) 45 return 1; 46 return 0; 47 } 48 #endif 49 50 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) 51 { 52 if (a->proto != b->proto) 53 return 0; 54 switch (a->proto) { 55 case htons(ETH_P_IP): 56 return a->u.ip4 == b->u.ip4; 57 #if IS_ENABLED(CONFIG_IPV6) 58 case htons(ETH_P_IPV6): 59 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); 60 #endif 61 } 62 return 0; 63 } 64 65 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip) 66 { 67 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1); 68 } 69 70 #if IS_ENABLED(CONFIG_IPV6) 71 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, 72 const struct in6_addr *ip) 73 { 74 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1); 75 } 76 #endif 77 78 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, 79 struct br_ip *ip) 80 { 81 switch (ip->proto) { 82 case htons(ETH_P_IP): 83 return __br_ip4_hash(mdb, ip->u.ip4); 84 #if IS_ENABLED(CONFIG_IPV6) 85 case htons(ETH_P_IPV6): 86 return __br_ip6_hash(mdb, &ip->u.ip6); 87 #endif 88 } 89 return 0; 90 } 91 92 static struct net_bridge_mdb_entry *__br_mdb_ip_get( 93 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) 94 { 95 struct net_bridge_mdb_entry *mp; 96 struct hlist_node *p; 97 98 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { 99 if (br_ip_equal(&mp->addr, dst)) 100 return mp; 101 } 102 103 return NULL; 104 } 105 106 static struct net_bridge_mdb_entry *br_mdb_ip_get( 107 struct net_bridge_mdb_htable *mdb, struct br_ip *dst) 108 { 109 if (!mdb) 110 return NULL; 111 112 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); 113 } 114 115 static struct net_bridge_mdb_entry *br_mdb_ip4_get( 116 struct net_bridge_mdb_htable *mdb, __be32 dst) 117 { 118 struct br_ip br_dst; 119 120 br_dst.u.ip4 = dst; 121 br_dst.proto = htons(ETH_P_IP); 122 123 return br_mdb_ip_get(mdb, &br_dst); 124 } 125 126 #if IS_ENABLED(CONFIG_IPV6) 127 static struct net_bridge_mdb_entry *br_mdb_ip6_get( 128 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst) 129 { 130 struct br_ip br_dst; 131 132 br_dst.u.ip6 = *dst; 133 br_dst.proto = htons(ETH_P_IPV6); 134 135 return br_mdb_ip_get(mdb, &br_dst); 136 } 137 #endif 138 139 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 140 struct sk_buff *skb) 141 { 142 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb); 143 struct br_ip ip; 144 145 if (br->multicast_disabled) 146 return NULL; 147 148 if (BR_INPUT_SKB_CB(skb)->igmp) 149 return NULL; 150 151 ip.proto = skb->protocol; 152 153 switch (skb->protocol) { 154 case htons(ETH_P_IP): 155 ip.u.ip4 = ip_hdr(skb)->daddr; 156 break; 157 #if IS_ENABLED(CONFIG_IPV6) 158 case htons(ETH_P_IPV6): 159 ip.u.ip6 = ipv6_hdr(skb)->daddr; 160 break; 161 #endif 162 default: 163 return NULL; 164 } 165 166 return br_mdb_ip_get(mdb, &ip); 167 } 168 169 static void br_mdb_free(struct rcu_head *head) 170 { 171 struct net_bridge_mdb_htable *mdb = 172 container_of(head, struct net_bridge_mdb_htable, rcu); 173 struct net_bridge_mdb_htable *old = mdb->old; 174 175 mdb->old = NULL; 176 kfree(old->mhash); 177 kfree(old); 178 } 179 180 static int br_mdb_copy(struct net_bridge_mdb_htable *new, 181 struct net_bridge_mdb_htable *old, 182 int elasticity) 183 { 184 struct net_bridge_mdb_entry *mp; 185 struct hlist_node *p; 186 int maxlen; 187 int len; 188 int i; 189 190 for (i = 0; i < old->max; i++) 191 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver]) 192 hlist_add_head(&mp->hlist[new->ver], 193 &new->mhash[br_ip_hash(new, &mp->addr)]); 194 195 if (!elasticity) 196 return 0; 197 198 maxlen = 0; 199 for (i = 0; i < new->max; i++) { 200 len = 0; 201 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver]) 202 len++; 203 if (len > maxlen) 204 maxlen = len; 205 } 206 207 return maxlen > elasticity ? -EINVAL : 0; 208 } 209 210 static void br_multicast_free_pg(struct rcu_head *head) 211 { 212 struct net_bridge_port_group *p = 213 container_of(head, struct net_bridge_port_group, rcu); 214 215 kfree(p); 216 } 217 218 static void br_multicast_free_group(struct rcu_head *head) 219 { 220 struct net_bridge_mdb_entry *mp = 221 container_of(head, struct net_bridge_mdb_entry, rcu); 222 223 kfree(mp); 224 } 225 226 static void br_multicast_group_expired(unsigned long data) 227 { 228 struct net_bridge_mdb_entry *mp = (void *)data; 229 struct net_bridge *br = mp->br; 230 struct net_bridge_mdb_htable *mdb; 231 232 spin_lock(&br->multicast_lock); 233 if (!netif_running(br->dev) || timer_pending(&mp->timer)) 234 goto out; 235 236 mp->mglist = false; 237 238 if (mp->ports) 239 goto out; 240 241 mdb = mlock_dereference(br->mdb, br); 242 243 hlist_del_rcu(&mp->hlist[mdb->ver]); 244 mdb->size--; 245 246 call_rcu_bh(&mp->rcu, br_multicast_free_group); 247 248 out: 249 spin_unlock(&br->multicast_lock); 250 } 251 252 static void br_multicast_del_pg(struct net_bridge *br, 253 struct net_bridge_port_group *pg) 254 { 255 struct net_bridge_mdb_htable *mdb; 256 struct net_bridge_mdb_entry *mp; 257 struct net_bridge_port_group *p; 258 struct net_bridge_port_group __rcu **pp; 259 260 mdb = mlock_dereference(br->mdb, br); 261 262 mp = br_mdb_ip_get(mdb, &pg->addr); 263 if (WARN_ON(!mp)) 264 return; 265 266 for (pp = &mp->ports; 267 (p = mlock_dereference(*pp, br)) != NULL; 268 pp = &p->next) { 269 if (p != pg) 270 continue; 271 272 rcu_assign_pointer(*pp, p->next); 273 hlist_del_init(&p->mglist); 274 del_timer(&p->timer); 275 call_rcu_bh(&p->rcu, br_multicast_free_pg); 276 277 if (!mp->ports && !mp->mglist && 278 netif_running(br->dev)) 279 mod_timer(&mp->timer, jiffies); 280 281 return; 282 } 283 284 WARN_ON(1); 285 } 286 287 static void br_multicast_port_group_expired(unsigned long data) 288 { 289 struct net_bridge_port_group *pg = (void *)data; 290 struct net_bridge *br = pg->port->br; 291 292 spin_lock(&br->multicast_lock); 293 if (!netif_running(br->dev) || timer_pending(&pg->timer) || 294 hlist_unhashed(&pg->mglist)) 295 goto out; 296 297 br_multicast_del_pg(br, pg); 298 299 out: 300 spin_unlock(&br->multicast_lock); 301 } 302 303 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, 304 int elasticity) 305 { 306 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); 307 struct net_bridge_mdb_htable *mdb; 308 int err; 309 310 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); 311 if (!mdb) 312 return -ENOMEM; 313 314 mdb->max = max; 315 mdb->old = old; 316 317 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); 318 if (!mdb->mhash) { 319 kfree(mdb); 320 return -ENOMEM; 321 } 322 323 mdb->size = old ? old->size : 0; 324 mdb->ver = old ? old->ver ^ 1 : 0; 325 326 if (!old || elasticity) 327 get_random_bytes(&mdb->secret, sizeof(mdb->secret)); 328 else 329 mdb->secret = old->secret; 330 331 if (!old) 332 goto out; 333 334 err = br_mdb_copy(mdb, old, elasticity); 335 if (err) { 336 kfree(mdb->mhash); 337 kfree(mdb); 338 return err; 339 } 340 341 call_rcu_bh(&mdb->rcu, br_mdb_free); 342 343 out: 344 rcu_assign_pointer(*mdbp, mdb); 345 346 return 0; 347 } 348 349 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, 350 __be32 group) 351 { 352 struct sk_buff *skb; 353 struct igmphdr *ih; 354 struct ethhdr *eth; 355 struct iphdr *iph; 356 357 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + 358 sizeof(*ih) + 4); 359 if (!skb) 360 goto out; 361 362 skb->protocol = htons(ETH_P_IP); 363 364 skb_reset_mac_header(skb); 365 eth = eth_hdr(skb); 366 367 memcpy(eth->h_source, br->dev->dev_addr, 6); 368 eth->h_dest[0] = 1; 369 eth->h_dest[1] = 0; 370 eth->h_dest[2] = 0x5e; 371 eth->h_dest[3] = 0; 372 eth->h_dest[4] = 0; 373 eth->h_dest[5] = 1; 374 eth->h_proto = htons(ETH_P_IP); 375 skb_put(skb, sizeof(*eth)); 376 377 skb_set_network_header(skb, skb->len); 378 iph = ip_hdr(skb); 379 380 iph->version = 4; 381 iph->ihl = 6; 382 iph->tos = 0xc0; 383 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); 384 iph->id = 0; 385 iph->frag_off = htons(IP_DF); 386 iph->ttl = 1; 387 iph->protocol = IPPROTO_IGMP; 388 iph->saddr = 0; 389 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); 390 ((u8 *)&iph[1])[0] = IPOPT_RA; 391 ((u8 *)&iph[1])[1] = 4; 392 ((u8 *)&iph[1])[2] = 0; 393 ((u8 *)&iph[1])[3] = 0; 394 ip_send_check(iph); 395 skb_put(skb, 24); 396 397 skb_set_transport_header(skb, skb->len); 398 ih = igmp_hdr(skb); 399 ih->type = IGMP_HOST_MEMBERSHIP_QUERY; 400 ih->code = (group ? br->multicast_last_member_interval : 401 br->multicast_query_response_interval) / 402 (HZ / IGMP_TIMER_SCALE); 403 ih->group = group; 404 ih->csum = 0; 405 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 406 skb_put(skb, sizeof(*ih)); 407 408 __skb_pull(skb, sizeof(*eth)); 409 410 out: 411 return skb; 412 } 413 414 #if IS_ENABLED(CONFIG_IPV6) 415 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, 416 const struct in6_addr *group) 417 { 418 struct sk_buff *skb; 419 struct ipv6hdr *ip6h; 420 struct mld_msg *mldq; 421 struct ethhdr *eth; 422 u8 *hopopt; 423 unsigned long interval; 424 425 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + 426 8 + sizeof(*mldq)); 427 if (!skb) 428 goto out; 429 430 skb->protocol = htons(ETH_P_IPV6); 431 432 /* Ethernet header */ 433 skb_reset_mac_header(skb); 434 eth = eth_hdr(skb); 435 436 memcpy(eth->h_source, br->dev->dev_addr, 6); 437 eth->h_proto = htons(ETH_P_IPV6); 438 skb_put(skb, sizeof(*eth)); 439 440 /* IPv6 header + HbH option */ 441 skb_set_network_header(skb, skb->len); 442 ip6h = ipv6_hdr(skb); 443 444 *(__force __be32 *)ip6h = htonl(0x60000000); 445 ip6h->payload_len = htons(8 + sizeof(*mldq)); 446 ip6h->nexthdr = IPPROTO_HOPOPTS; 447 ip6h->hop_limit = 1; 448 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); 449 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, 450 &ip6h->saddr)) { 451 kfree_skb(skb); 452 return NULL; 453 } 454 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 455 456 hopopt = (u8 *)(ip6h + 1); 457 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ 458 hopopt[1] = 0; /* length of HbH */ 459 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ 460 hopopt[3] = 2; /* Length of RA Option */ 461 hopopt[4] = 0; /* Type = 0x0000 (MLD) */ 462 hopopt[5] = 0; 463 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ 464 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ 465 466 skb_put(skb, sizeof(*ip6h) + 8); 467 468 /* ICMPv6 */ 469 skb_set_transport_header(skb, skb->len); 470 mldq = (struct mld_msg *) icmp6_hdr(skb); 471 472 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval : 473 br->multicast_query_response_interval; 474 475 mldq->mld_type = ICMPV6_MGM_QUERY; 476 mldq->mld_code = 0; 477 mldq->mld_cksum = 0; 478 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); 479 mldq->mld_reserved = 0; 480 mldq->mld_mca = *group; 481 482 /* checksum */ 483 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 484 sizeof(*mldq), IPPROTO_ICMPV6, 485 csum_partial(mldq, 486 sizeof(*mldq), 0)); 487 skb_put(skb, sizeof(*mldq)); 488 489 __skb_pull(skb, sizeof(*eth)); 490 491 out: 492 return skb; 493 } 494 #endif 495 496 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, 497 struct br_ip *addr) 498 { 499 switch (addr->proto) { 500 case htons(ETH_P_IP): 501 return br_ip4_multicast_alloc_query(br, addr->u.ip4); 502 #if IS_ENABLED(CONFIG_IPV6) 503 case htons(ETH_P_IPV6): 504 return br_ip6_multicast_alloc_query(br, &addr->u.ip6); 505 #endif 506 } 507 return NULL; 508 } 509 510 static struct net_bridge_mdb_entry *br_multicast_get_group( 511 struct net_bridge *br, struct net_bridge_port *port, 512 struct br_ip *group, int hash) 513 { 514 struct net_bridge_mdb_htable *mdb; 515 struct net_bridge_mdb_entry *mp; 516 struct hlist_node *p; 517 unsigned int count = 0; 518 unsigned int max; 519 int elasticity; 520 int err; 521 522 mdb = rcu_dereference_protected(br->mdb, 1); 523 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { 524 count++; 525 if (unlikely(br_ip_equal(group, &mp->addr))) 526 return mp; 527 } 528 529 elasticity = 0; 530 max = mdb->max; 531 532 if (unlikely(count > br->hash_elasticity && count)) { 533 if (net_ratelimit()) 534 br_info(br, "Multicast hash table " 535 "chain limit reached: %s\n", 536 port ? port->dev->name : br->dev->name); 537 538 elasticity = br->hash_elasticity; 539 } 540 541 if (mdb->size >= max) { 542 max *= 2; 543 if (unlikely(max > br->hash_max)) { 544 br_warn(br, "Multicast hash table maximum of %d " 545 "reached, disabling snooping: %s\n", 546 br->hash_max, 547 port ? port->dev->name : br->dev->name); 548 err = -E2BIG; 549 disable: 550 br->multicast_disabled = 1; 551 goto err; 552 } 553 } 554 555 if (max > mdb->max || elasticity) { 556 if (mdb->old) { 557 if (net_ratelimit()) 558 br_info(br, "Multicast hash table " 559 "on fire: %s\n", 560 port ? port->dev->name : br->dev->name); 561 err = -EEXIST; 562 goto err; 563 } 564 565 err = br_mdb_rehash(&br->mdb, max, elasticity); 566 if (err) { 567 br_warn(br, "Cannot rehash multicast " 568 "hash table, disabling snooping: %s, %d, %d\n", 569 port ? port->dev->name : br->dev->name, 570 mdb->size, err); 571 goto disable; 572 } 573 574 err = -EAGAIN; 575 goto err; 576 } 577 578 return NULL; 579 580 err: 581 mp = ERR_PTR(err); 582 return mp; 583 } 584 585 static struct net_bridge_mdb_entry *br_multicast_new_group( 586 struct net_bridge *br, struct net_bridge_port *port, 587 struct br_ip *group) 588 { 589 struct net_bridge_mdb_htable *mdb; 590 struct net_bridge_mdb_entry *mp; 591 int hash; 592 int err; 593 594 mdb = rcu_dereference_protected(br->mdb, 1); 595 if (!mdb) { 596 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); 597 if (err) 598 return ERR_PTR(err); 599 goto rehash; 600 } 601 602 hash = br_ip_hash(mdb, group); 603 mp = br_multicast_get_group(br, port, group, hash); 604 switch (PTR_ERR(mp)) { 605 case 0: 606 break; 607 608 case -EAGAIN: 609 rehash: 610 mdb = rcu_dereference_protected(br->mdb, 1); 611 hash = br_ip_hash(mdb, group); 612 break; 613 614 default: 615 goto out; 616 } 617 618 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 619 if (unlikely(!mp)) 620 return ERR_PTR(-ENOMEM); 621 622 mp->br = br; 623 mp->addr = *group; 624 setup_timer(&mp->timer, br_multicast_group_expired, 625 (unsigned long)mp); 626 627 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); 628 mdb->size++; 629 630 out: 631 return mp; 632 } 633 634 static int br_multicast_add_group(struct net_bridge *br, 635 struct net_bridge_port *port, 636 struct br_ip *group) 637 { 638 struct net_bridge_mdb_entry *mp; 639 struct net_bridge_port_group *p; 640 struct net_bridge_port_group __rcu **pp; 641 unsigned long now = jiffies; 642 int err; 643 644 spin_lock(&br->multicast_lock); 645 if (!netif_running(br->dev) || 646 (port && port->state == BR_STATE_DISABLED)) 647 goto out; 648 649 mp = br_multicast_new_group(br, port, group); 650 err = PTR_ERR(mp); 651 if (IS_ERR(mp)) 652 goto err; 653 654 if (!port) { 655 mp->mglist = true; 656 mod_timer(&mp->timer, now + br->multicast_membership_interval); 657 goto out; 658 } 659 660 for (pp = &mp->ports; 661 (p = mlock_dereference(*pp, br)) != NULL; 662 pp = &p->next) { 663 if (p->port == port) 664 goto found; 665 if ((unsigned long)p->port < (unsigned long)port) 666 break; 667 } 668 669 p = kzalloc(sizeof(*p), GFP_ATOMIC); 670 err = -ENOMEM; 671 if (unlikely(!p)) 672 goto err; 673 674 p->addr = *group; 675 p->port = port; 676 p->next = *pp; 677 hlist_add_head(&p->mglist, &port->mglist); 678 setup_timer(&p->timer, br_multicast_port_group_expired, 679 (unsigned long)p); 680 681 rcu_assign_pointer(*pp, p); 682 683 found: 684 mod_timer(&p->timer, now + br->multicast_membership_interval); 685 out: 686 err = 0; 687 688 err: 689 spin_unlock(&br->multicast_lock); 690 return err; 691 } 692 693 static int br_ip4_multicast_add_group(struct net_bridge *br, 694 struct net_bridge_port *port, 695 __be32 group) 696 { 697 struct br_ip br_group; 698 699 if (ipv4_is_local_multicast(group)) 700 return 0; 701 702 br_group.u.ip4 = group; 703 br_group.proto = htons(ETH_P_IP); 704 705 return br_multicast_add_group(br, port, &br_group); 706 } 707 708 #if IS_ENABLED(CONFIG_IPV6) 709 static int br_ip6_multicast_add_group(struct net_bridge *br, 710 struct net_bridge_port *port, 711 const struct in6_addr *group) 712 { 713 struct br_ip br_group; 714 715 if (!ipv6_is_transient_multicast(group)) 716 return 0; 717 718 br_group.u.ip6 = *group; 719 br_group.proto = htons(ETH_P_IPV6); 720 721 return br_multicast_add_group(br, port, &br_group); 722 } 723 #endif 724 725 static void br_multicast_router_expired(unsigned long data) 726 { 727 struct net_bridge_port *port = (void *)data; 728 struct net_bridge *br = port->br; 729 730 spin_lock(&br->multicast_lock); 731 if (port->multicast_router != 1 || 732 timer_pending(&port->multicast_router_timer) || 733 hlist_unhashed(&port->rlist)) 734 goto out; 735 736 hlist_del_init_rcu(&port->rlist); 737 738 out: 739 spin_unlock(&br->multicast_lock); 740 } 741 742 static void br_multicast_local_router_expired(unsigned long data) 743 { 744 } 745 746 static void br_multicast_querier_expired(unsigned long data) 747 { 748 struct net_bridge *br = (void *)data; 749 750 spin_lock(&br->multicast_lock); 751 if (!netif_running(br->dev) || br->multicast_disabled) 752 goto out; 753 754 br_multicast_start_querier(br); 755 756 out: 757 spin_unlock(&br->multicast_lock); 758 } 759 760 static void __br_multicast_send_query(struct net_bridge *br, 761 struct net_bridge_port *port, 762 struct br_ip *ip) 763 { 764 struct sk_buff *skb; 765 766 skb = br_multicast_alloc_query(br, ip); 767 if (!skb) 768 return; 769 770 if (port) { 771 __skb_push(skb, sizeof(struct ethhdr)); 772 skb->dev = port->dev; 773 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, 774 dev_queue_xmit); 775 } else 776 netif_rx(skb); 777 } 778 779 static void br_multicast_send_query(struct net_bridge *br, 780 struct net_bridge_port *port, u32 sent) 781 { 782 unsigned long time; 783 struct br_ip br_group; 784 785 if (!netif_running(br->dev) || br->multicast_disabled || 786 !br->multicast_querier || 787 timer_pending(&br->multicast_querier_timer)) 788 return; 789 790 memset(&br_group.u, 0, sizeof(br_group.u)); 791 792 br_group.proto = htons(ETH_P_IP); 793 __br_multicast_send_query(br, port, &br_group); 794 795 #if IS_ENABLED(CONFIG_IPV6) 796 br_group.proto = htons(ETH_P_IPV6); 797 __br_multicast_send_query(br, port, &br_group); 798 #endif 799 800 time = jiffies; 801 time += sent < br->multicast_startup_query_count ? 802 br->multicast_startup_query_interval : 803 br->multicast_query_interval; 804 mod_timer(port ? &port->multicast_query_timer : 805 &br->multicast_query_timer, time); 806 } 807 808 static void br_multicast_port_query_expired(unsigned long data) 809 { 810 struct net_bridge_port *port = (void *)data; 811 struct net_bridge *br = port->br; 812 813 spin_lock(&br->multicast_lock); 814 if (port->state == BR_STATE_DISABLED || 815 port->state == BR_STATE_BLOCKING) 816 goto out; 817 818 if (port->multicast_startup_queries_sent < 819 br->multicast_startup_query_count) 820 port->multicast_startup_queries_sent++; 821 822 br_multicast_send_query(port->br, port, 823 port->multicast_startup_queries_sent); 824 825 out: 826 spin_unlock(&br->multicast_lock); 827 } 828 829 void br_multicast_add_port(struct net_bridge_port *port) 830 { 831 port->multicast_router = 1; 832 833 setup_timer(&port->multicast_router_timer, br_multicast_router_expired, 834 (unsigned long)port); 835 setup_timer(&port->multicast_query_timer, 836 br_multicast_port_query_expired, (unsigned long)port); 837 } 838 839 void br_multicast_del_port(struct net_bridge_port *port) 840 { 841 del_timer_sync(&port->multicast_router_timer); 842 } 843 844 static void __br_multicast_enable_port(struct net_bridge_port *port) 845 { 846 port->multicast_startup_queries_sent = 0; 847 848 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || 849 del_timer(&port->multicast_query_timer)) 850 mod_timer(&port->multicast_query_timer, jiffies); 851 } 852 853 void br_multicast_enable_port(struct net_bridge_port *port) 854 { 855 struct net_bridge *br = port->br; 856 857 spin_lock(&br->multicast_lock); 858 if (br->multicast_disabled || !netif_running(br->dev)) 859 goto out; 860 861 __br_multicast_enable_port(port); 862 863 out: 864 spin_unlock(&br->multicast_lock); 865 } 866 867 void br_multicast_disable_port(struct net_bridge_port *port) 868 { 869 struct net_bridge *br = port->br; 870 struct net_bridge_port_group *pg; 871 struct hlist_node *p, *n; 872 873 spin_lock(&br->multicast_lock); 874 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist) 875 br_multicast_del_pg(br, pg); 876 877 if (!hlist_unhashed(&port->rlist)) 878 hlist_del_init_rcu(&port->rlist); 879 del_timer(&port->multicast_router_timer); 880 del_timer(&port->multicast_query_timer); 881 spin_unlock(&br->multicast_lock); 882 } 883 884 static int br_ip4_multicast_igmp3_report(struct net_bridge *br, 885 struct net_bridge_port *port, 886 struct sk_buff *skb) 887 { 888 struct igmpv3_report *ih; 889 struct igmpv3_grec *grec; 890 int i; 891 int len; 892 int num; 893 int type; 894 int err = 0; 895 __be32 group; 896 897 if (!pskb_may_pull(skb, sizeof(*ih))) 898 return -EINVAL; 899 900 ih = igmpv3_report_hdr(skb); 901 num = ntohs(ih->ngrec); 902 len = sizeof(*ih); 903 904 for (i = 0; i < num; i++) { 905 len += sizeof(*grec); 906 if (!pskb_may_pull(skb, len)) 907 return -EINVAL; 908 909 grec = (void *)(skb->data + len - sizeof(*grec)); 910 group = grec->grec_mca; 911 type = grec->grec_type; 912 913 len += ntohs(grec->grec_nsrcs) * 4; 914 if (!pskb_may_pull(skb, len)) 915 return -EINVAL; 916 917 /* We treat this as an IGMPv2 report for now. */ 918 switch (type) { 919 case IGMPV3_MODE_IS_INCLUDE: 920 case IGMPV3_MODE_IS_EXCLUDE: 921 case IGMPV3_CHANGE_TO_INCLUDE: 922 case IGMPV3_CHANGE_TO_EXCLUDE: 923 case IGMPV3_ALLOW_NEW_SOURCES: 924 case IGMPV3_BLOCK_OLD_SOURCES: 925 break; 926 927 default: 928 continue; 929 } 930 931 err = br_ip4_multicast_add_group(br, port, group); 932 if (err) 933 break; 934 } 935 936 return err; 937 } 938 939 #if IS_ENABLED(CONFIG_IPV6) 940 static int br_ip6_multicast_mld2_report(struct net_bridge *br, 941 struct net_bridge_port *port, 942 struct sk_buff *skb) 943 { 944 struct icmp6hdr *icmp6h; 945 struct mld2_grec *grec; 946 int i; 947 int len; 948 int num; 949 int err = 0; 950 951 if (!pskb_may_pull(skb, sizeof(*icmp6h))) 952 return -EINVAL; 953 954 icmp6h = icmp6_hdr(skb); 955 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 956 len = sizeof(*icmp6h); 957 958 for (i = 0; i < num; i++) { 959 __be16 *nsrcs, _nsrcs; 960 961 nsrcs = skb_header_pointer(skb, 962 len + offsetof(struct mld2_grec, 963 grec_nsrcs), 964 sizeof(_nsrcs), &_nsrcs); 965 if (!nsrcs) 966 return -EINVAL; 967 968 if (!pskb_may_pull(skb, 969 len + sizeof(*grec) + 970 sizeof(struct in6_addr) * ntohs(*nsrcs))) 971 return -EINVAL; 972 973 grec = (struct mld2_grec *)(skb->data + len); 974 len += sizeof(*grec) + 975 sizeof(struct in6_addr) * ntohs(*nsrcs); 976 977 /* We treat these as MLDv1 reports for now. */ 978 switch (grec->grec_type) { 979 case MLD2_MODE_IS_INCLUDE: 980 case MLD2_MODE_IS_EXCLUDE: 981 case MLD2_CHANGE_TO_INCLUDE: 982 case MLD2_CHANGE_TO_EXCLUDE: 983 case MLD2_ALLOW_NEW_SOURCES: 984 case MLD2_BLOCK_OLD_SOURCES: 985 break; 986 987 default: 988 continue; 989 } 990 991 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca); 992 if (!err) 993 break; 994 } 995 996 return err; 997 } 998 #endif 999 1000 /* 1001 * Add port to rotuer_list 1002 * list is maintained ordered by pointer value 1003 * and locked by br->multicast_lock and RCU 1004 */ 1005 static void br_multicast_add_router(struct net_bridge *br, 1006 struct net_bridge_port *port) 1007 { 1008 struct net_bridge_port *p; 1009 struct hlist_node *n, *slot = NULL; 1010 1011 hlist_for_each_entry(p, n, &br->router_list, rlist) { 1012 if ((unsigned long) port >= (unsigned long) p) 1013 break; 1014 slot = n; 1015 } 1016 1017 if (slot) 1018 hlist_add_after_rcu(slot, &port->rlist); 1019 else 1020 hlist_add_head_rcu(&port->rlist, &br->router_list); 1021 } 1022 1023 static void br_multicast_mark_router(struct net_bridge *br, 1024 struct net_bridge_port *port) 1025 { 1026 unsigned long now = jiffies; 1027 1028 if (!port) { 1029 if (br->multicast_router == 1) 1030 mod_timer(&br->multicast_router_timer, 1031 now + br->multicast_querier_interval); 1032 return; 1033 } 1034 1035 if (port->multicast_router != 1) 1036 return; 1037 1038 if (!hlist_unhashed(&port->rlist)) 1039 goto timer; 1040 1041 br_multicast_add_router(br, port); 1042 1043 timer: 1044 mod_timer(&port->multicast_router_timer, 1045 now + br->multicast_querier_interval); 1046 } 1047 1048 static void br_multicast_query_received(struct net_bridge *br, 1049 struct net_bridge_port *port, 1050 int saddr) 1051 { 1052 if (saddr) 1053 mod_timer(&br->multicast_querier_timer, 1054 jiffies + br->multicast_querier_interval); 1055 else if (timer_pending(&br->multicast_querier_timer)) 1056 return; 1057 1058 br_multicast_mark_router(br, port); 1059 } 1060 1061 static int br_ip4_multicast_query(struct net_bridge *br, 1062 struct net_bridge_port *port, 1063 struct sk_buff *skb) 1064 { 1065 const struct iphdr *iph = ip_hdr(skb); 1066 struct igmphdr *ih = igmp_hdr(skb); 1067 struct net_bridge_mdb_entry *mp; 1068 struct igmpv3_query *ih3; 1069 struct net_bridge_port_group *p; 1070 struct net_bridge_port_group __rcu **pp; 1071 unsigned long max_delay; 1072 unsigned long now = jiffies; 1073 __be32 group; 1074 int err = 0; 1075 1076 spin_lock(&br->multicast_lock); 1077 if (!netif_running(br->dev) || 1078 (port && port->state == BR_STATE_DISABLED)) 1079 goto out; 1080 1081 br_multicast_query_received(br, port, !!iph->saddr); 1082 1083 group = ih->group; 1084 1085 if (skb->len == sizeof(*ih)) { 1086 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 1087 1088 if (!max_delay) { 1089 max_delay = 10 * HZ; 1090 group = 0; 1091 } 1092 } else { 1093 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) { 1094 err = -EINVAL; 1095 goto out; 1096 } 1097 1098 ih3 = igmpv3_query_hdr(skb); 1099 if (ih3->nsrcs) 1100 goto out; 1101 1102 max_delay = ih3->code ? 1103 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 1104 } 1105 1106 if (!group) 1107 goto out; 1108 1109 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group); 1110 if (!mp) 1111 goto out; 1112 1113 max_delay *= br->multicast_last_member_count; 1114 1115 if (mp->mglist && 1116 (timer_pending(&mp->timer) ? 1117 time_after(mp->timer.expires, now + max_delay) : 1118 try_to_del_timer_sync(&mp->timer) >= 0)) 1119 mod_timer(&mp->timer, now + max_delay); 1120 1121 for (pp = &mp->ports; 1122 (p = mlock_dereference(*pp, br)) != NULL; 1123 pp = &p->next) { 1124 if (timer_pending(&p->timer) ? 1125 time_after(p->timer.expires, now + max_delay) : 1126 try_to_del_timer_sync(&p->timer) >= 0) 1127 mod_timer(&p->timer, now + max_delay); 1128 } 1129 1130 out: 1131 spin_unlock(&br->multicast_lock); 1132 return err; 1133 } 1134 1135 #if IS_ENABLED(CONFIG_IPV6) 1136 static int br_ip6_multicast_query(struct net_bridge *br, 1137 struct net_bridge_port *port, 1138 struct sk_buff *skb) 1139 { 1140 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 1141 struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb); 1142 struct net_bridge_mdb_entry *mp; 1143 struct mld2_query *mld2q; 1144 struct net_bridge_port_group *p; 1145 struct net_bridge_port_group __rcu **pp; 1146 unsigned long max_delay; 1147 unsigned long now = jiffies; 1148 const struct in6_addr *group = NULL; 1149 int err = 0; 1150 1151 spin_lock(&br->multicast_lock); 1152 if (!netif_running(br->dev) || 1153 (port && port->state == BR_STATE_DISABLED)) 1154 goto out; 1155 1156 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr)); 1157 1158 if (skb->len == sizeof(*mld)) { 1159 if (!pskb_may_pull(skb, sizeof(*mld))) { 1160 err = -EINVAL; 1161 goto out; 1162 } 1163 mld = (struct mld_msg *) icmp6_hdr(skb); 1164 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); 1165 if (max_delay) 1166 group = &mld->mld_mca; 1167 } else if (skb->len >= sizeof(*mld2q)) { 1168 if (!pskb_may_pull(skb, sizeof(*mld2q))) { 1169 err = -EINVAL; 1170 goto out; 1171 } 1172 mld2q = (struct mld2_query *)icmp6_hdr(skb); 1173 if (!mld2q->mld2q_nsrcs) 1174 group = &mld2q->mld2q_mca; 1175 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1; 1176 } 1177 1178 if (!group) 1179 goto out; 1180 1181 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group); 1182 if (!mp) 1183 goto out; 1184 1185 max_delay *= br->multicast_last_member_count; 1186 if (mp->mglist && 1187 (timer_pending(&mp->timer) ? 1188 time_after(mp->timer.expires, now + max_delay) : 1189 try_to_del_timer_sync(&mp->timer) >= 0)) 1190 mod_timer(&mp->timer, now + max_delay); 1191 1192 for (pp = &mp->ports; 1193 (p = mlock_dereference(*pp, br)) != NULL; 1194 pp = &p->next) { 1195 if (timer_pending(&p->timer) ? 1196 time_after(p->timer.expires, now + max_delay) : 1197 try_to_del_timer_sync(&p->timer) >= 0) 1198 mod_timer(&p->timer, now + max_delay); 1199 } 1200 1201 out: 1202 spin_unlock(&br->multicast_lock); 1203 return err; 1204 } 1205 #endif 1206 1207 static void br_multicast_leave_group(struct net_bridge *br, 1208 struct net_bridge_port *port, 1209 struct br_ip *group) 1210 { 1211 struct net_bridge_mdb_htable *mdb; 1212 struct net_bridge_mdb_entry *mp; 1213 struct net_bridge_port_group *p; 1214 unsigned long now; 1215 unsigned long time; 1216 1217 spin_lock(&br->multicast_lock); 1218 if (!netif_running(br->dev) || 1219 (port && port->state == BR_STATE_DISABLED) || 1220 timer_pending(&br->multicast_querier_timer)) 1221 goto out; 1222 1223 mdb = mlock_dereference(br->mdb, br); 1224 mp = br_mdb_ip_get(mdb, group); 1225 if (!mp) 1226 goto out; 1227 1228 now = jiffies; 1229 time = now + br->multicast_last_member_count * 1230 br->multicast_last_member_interval; 1231 1232 if (!port) { 1233 if (mp->mglist && 1234 (timer_pending(&mp->timer) ? 1235 time_after(mp->timer.expires, time) : 1236 try_to_del_timer_sync(&mp->timer) >= 0)) { 1237 mod_timer(&mp->timer, time); 1238 } 1239 1240 goto out; 1241 } 1242 1243 for (p = mlock_dereference(mp->ports, br); 1244 p != NULL; 1245 p = mlock_dereference(p->next, br)) { 1246 if (p->port != port) 1247 continue; 1248 1249 if (!hlist_unhashed(&p->mglist) && 1250 (timer_pending(&p->timer) ? 1251 time_after(p->timer.expires, time) : 1252 try_to_del_timer_sync(&p->timer) >= 0)) { 1253 mod_timer(&p->timer, time); 1254 } 1255 1256 break; 1257 } 1258 1259 out: 1260 spin_unlock(&br->multicast_lock); 1261 } 1262 1263 static void br_ip4_multicast_leave_group(struct net_bridge *br, 1264 struct net_bridge_port *port, 1265 __be32 group) 1266 { 1267 struct br_ip br_group; 1268 1269 if (ipv4_is_local_multicast(group)) 1270 return; 1271 1272 br_group.u.ip4 = group; 1273 br_group.proto = htons(ETH_P_IP); 1274 1275 br_multicast_leave_group(br, port, &br_group); 1276 } 1277 1278 #if IS_ENABLED(CONFIG_IPV6) 1279 static void br_ip6_multicast_leave_group(struct net_bridge *br, 1280 struct net_bridge_port *port, 1281 const struct in6_addr *group) 1282 { 1283 struct br_ip br_group; 1284 1285 if (!ipv6_is_transient_multicast(group)) 1286 return; 1287 1288 br_group.u.ip6 = *group; 1289 br_group.proto = htons(ETH_P_IPV6); 1290 1291 br_multicast_leave_group(br, port, &br_group); 1292 } 1293 #endif 1294 1295 static int br_multicast_ipv4_rcv(struct net_bridge *br, 1296 struct net_bridge_port *port, 1297 struct sk_buff *skb) 1298 { 1299 struct sk_buff *skb2 = skb; 1300 const struct iphdr *iph; 1301 struct igmphdr *ih; 1302 unsigned int len; 1303 unsigned int offset; 1304 int err; 1305 1306 /* We treat OOM as packet loss for now. */ 1307 if (!pskb_may_pull(skb, sizeof(*iph))) 1308 return -EINVAL; 1309 1310 iph = ip_hdr(skb); 1311 1312 if (iph->ihl < 5 || iph->version != 4) 1313 return -EINVAL; 1314 1315 if (!pskb_may_pull(skb, ip_hdrlen(skb))) 1316 return -EINVAL; 1317 1318 iph = ip_hdr(skb); 1319 1320 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1321 return -EINVAL; 1322 1323 if (iph->protocol != IPPROTO_IGMP) { 1324 if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP) 1325 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1326 return 0; 1327 } 1328 1329 len = ntohs(iph->tot_len); 1330 if (skb->len < len || len < ip_hdrlen(skb)) 1331 return -EINVAL; 1332 1333 if (skb->len > len) { 1334 skb2 = skb_clone(skb, GFP_ATOMIC); 1335 if (!skb2) 1336 return -ENOMEM; 1337 1338 err = pskb_trim_rcsum(skb2, len); 1339 if (err) 1340 goto err_out; 1341 } 1342 1343 len -= ip_hdrlen(skb2); 1344 offset = skb_network_offset(skb2) + ip_hdrlen(skb2); 1345 __skb_pull(skb2, offset); 1346 skb_reset_transport_header(skb2); 1347 1348 err = -EINVAL; 1349 if (!pskb_may_pull(skb2, sizeof(*ih))) 1350 goto out; 1351 1352 switch (skb2->ip_summed) { 1353 case CHECKSUM_COMPLETE: 1354 if (!csum_fold(skb2->csum)) 1355 break; 1356 /* fall through */ 1357 case CHECKSUM_NONE: 1358 skb2->csum = 0; 1359 if (skb_checksum_complete(skb2)) 1360 goto out; 1361 } 1362 1363 err = 0; 1364 1365 BR_INPUT_SKB_CB(skb)->igmp = 1; 1366 ih = igmp_hdr(skb2); 1367 1368 switch (ih->type) { 1369 case IGMP_HOST_MEMBERSHIP_REPORT: 1370 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1371 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1372 err = br_ip4_multicast_add_group(br, port, ih->group); 1373 break; 1374 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1375 err = br_ip4_multicast_igmp3_report(br, port, skb2); 1376 break; 1377 case IGMP_HOST_MEMBERSHIP_QUERY: 1378 err = br_ip4_multicast_query(br, port, skb2); 1379 break; 1380 case IGMP_HOST_LEAVE_MESSAGE: 1381 br_ip4_multicast_leave_group(br, port, ih->group); 1382 break; 1383 } 1384 1385 out: 1386 __skb_push(skb2, offset); 1387 err_out: 1388 if (skb2 != skb) 1389 kfree_skb(skb2); 1390 return err; 1391 } 1392 1393 #if IS_ENABLED(CONFIG_IPV6) 1394 static int br_multicast_ipv6_rcv(struct net_bridge *br, 1395 struct net_bridge_port *port, 1396 struct sk_buff *skb) 1397 { 1398 struct sk_buff *skb2; 1399 const struct ipv6hdr *ip6h; 1400 u8 icmp6_type; 1401 u8 nexthdr; 1402 __be16 frag_off; 1403 unsigned int len; 1404 int offset; 1405 int err; 1406 1407 if (!pskb_may_pull(skb, sizeof(*ip6h))) 1408 return -EINVAL; 1409 1410 ip6h = ipv6_hdr(skb); 1411 1412 /* 1413 * We're interested in MLD messages only. 1414 * - Version is 6 1415 * - MLD has always Router Alert hop-by-hop option 1416 * - But we do not support jumbrograms. 1417 */ 1418 if (ip6h->version != 6 || 1419 ip6h->nexthdr != IPPROTO_HOPOPTS || 1420 ip6h->payload_len == 0) 1421 return 0; 1422 1423 len = ntohs(ip6h->payload_len) + sizeof(*ip6h); 1424 if (skb->len < len) 1425 return -EINVAL; 1426 1427 nexthdr = ip6h->nexthdr; 1428 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off); 1429 1430 if (offset < 0 || nexthdr != IPPROTO_ICMPV6) 1431 return 0; 1432 1433 /* Okay, we found ICMPv6 header */ 1434 skb2 = skb_clone(skb, GFP_ATOMIC); 1435 if (!skb2) 1436 return -ENOMEM; 1437 1438 err = -EINVAL; 1439 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr))) 1440 goto out; 1441 1442 len -= offset - skb_network_offset(skb2); 1443 1444 __skb_pull(skb2, offset); 1445 skb_reset_transport_header(skb2); 1446 skb_postpull_rcsum(skb2, skb_network_header(skb2), 1447 skb_network_header_len(skb2)); 1448 1449 icmp6_type = icmp6_hdr(skb2)->icmp6_type; 1450 1451 switch (icmp6_type) { 1452 case ICMPV6_MGM_QUERY: 1453 case ICMPV6_MGM_REPORT: 1454 case ICMPV6_MGM_REDUCTION: 1455 case ICMPV6_MLD2_REPORT: 1456 break; 1457 default: 1458 err = 0; 1459 goto out; 1460 } 1461 1462 /* Okay, we found MLD message. Check further. */ 1463 if (skb2->len > len) { 1464 err = pskb_trim_rcsum(skb2, len); 1465 if (err) 1466 goto out; 1467 err = -EINVAL; 1468 } 1469 1470 ip6h = ipv6_hdr(skb2); 1471 1472 switch (skb2->ip_summed) { 1473 case CHECKSUM_COMPLETE: 1474 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len, 1475 IPPROTO_ICMPV6, skb2->csum)) 1476 break; 1477 /*FALLTHROUGH*/ 1478 case CHECKSUM_NONE: 1479 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, 1480 &ip6h->daddr, 1481 skb2->len, 1482 IPPROTO_ICMPV6, 0)); 1483 if (__skb_checksum_complete(skb2)) 1484 goto out; 1485 } 1486 1487 err = 0; 1488 1489 BR_INPUT_SKB_CB(skb)->igmp = 1; 1490 1491 switch (icmp6_type) { 1492 case ICMPV6_MGM_REPORT: 1493 { 1494 struct mld_msg *mld; 1495 if (!pskb_may_pull(skb2, sizeof(*mld))) { 1496 err = -EINVAL; 1497 goto out; 1498 } 1499 mld = (struct mld_msg *)skb_transport_header(skb2); 1500 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1501 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca); 1502 break; 1503 } 1504 case ICMPV6_MLD2_REPORT: 1505 err = br_ip6_multicast_mld2_report(br, port, skb2); 1506 break; 1507 case ICMPV6_MGM_QUERY: 1508 err = br_ip6_multicast_query(br, port, skb2); 1509 break; 1510 case ICMPV6_MGM_REDUCTION: 1511 { 1512 struct mld_msg *mld; 1513 if (!pskb_may_pull(skb2, sizeof(*mld))) { 1514 err = -EINVAL; 1515 goto out; 1516 } 1517 mld = (struct mld_msg *)skb_transport_header(skb2); 1518 br_ip6_multicast_leave_group(br, port, &mld->mld_mca); 1519 } 1520 } 1521 1522 out: 1523 kfree_skb(skb2); 1524 return err; 1525 } 1526 #endif 1527 1528 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 1529 struct sk_buff *skb) 1530 { 1531 BR_INPUT_SKB_CB(skb)->igmp = 0; 1532 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 1533 1534 if (br->multicast_disabled) 1535 return 0; 1536 1537 switch (skb->protocol) { 1538 case htons(ETH_P_IP): 1539 return br_multicast_ipv4_rcv(br, port, skb); 1540 #if IS_ENABLED(CONFIG_IPV6) 1541 case htons(ETH_P_IPV6): 1542 return br_multicast_ipv6_rcv(br, port, skb); 1543 #endif 1544 } 1545 1546 return 0; 1547 } 1548 1549 static void br_multicast_query_expired(unsigned long data) 1550 { 1551 struct net_bridge *br = (void *)data; 1552 1553 spin_lock(&br->multicast_lock); 1554 if (br->multicast_startup_queries_sent < 1555 br->multicast_startup_query_count) 1556 br->multicast_startup_queries_sent++; 1557 1558 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent); 1559 1560 spin_unlock(&br->multicast_lock); 1561 } 1562 1563 void br_multicast_init(struct net_bridge *br) 1564 { 1565 br->hash_elasticity = 4; 1566 br->hash_max = 512; 1567 1568 br->multicast_router = 1; 1569 br->multicast_querier = 0; 1570 br->multicast_last_member_count = 2; 1571 br->multicast_startup_query_count = 2; 1572 1573 br->multicast_last_member_interval = HZ; 1574 br->multicast_query_response_interval = 10 * HZ; 1575 br->multicast_startup_query_interval = 125 * HZ / 4; 1576 br->multicast_query_interval = 125 * HZ; 1577 br->multicast_querier_interval = 255 * HZ; 1578 br->multicast_membership_interval = 260 * HZ; 1579 1580 spin_lock_init(&br->multicast_lock); 1581 setup_timer(&br->multicast_router_timer, 1582 br_multicast_local_router_expired, 0); 1583 setup_timer(&br->multicast_querier_timer, 1584 br_multicast_querier_expired, (unsigned long)br); 1585 setup_timer(&br->multicast_query_timer, br_multicast_query_expired, 1586 (unsigned long)br); 1587 } 1588 1589 void br_multicast_open(struct net_bridge *br) 1590 { 1591 br->multicast_startup_queries_sent = 0; 1592 1593 if (br->multicast_disabled) 1594 return; 1595 1596 mod_timer(&br->multicast_query_timer, jiffies); 1597 } 1598 1599 void br_multicast_stop(struct net_bridge *br) 1600 { 1601 struct net_bridge_mdb_htable *mdb; 1602 struct net_bridge_mdb_entry *mp; 1603 struct hlist_node *p, *n; 1604 u32 ver; 1605 int i; 1606 1607 del_timer_sync(&br->multicast_router_timer); 1608 del_timer_sync(&br->multicast_querier_timer); 1609 del_timer_sync(&br->multicast_query_timer); 1610 1611 spin_lock_bh(&br->multicast_lock); 1612 mdb = mlock_dereference(br->mdb, br); 1613 if (!mdb) 1614 goto out; 1615 1616 br->mdb = NULL; 1617 1618 ver = mdb->ver; 1619 for (i = 0; i < mdb->max; i++) { 1620 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i], 1621 hlist[ver]) { 1622 del_timer(&mp->timer); 1623 call_rcu_bh(&mp->rcu, br_multicast_free_group); 1624 } 1625 } 1626 1627 if (mdb->old) { 1628 spin_unlock_bh(&br->multicast_lock); 1629 rcu_barrier_bh(); 1630 spin_lock_bh(&br->multicast_lock); 1631 WARN_ON(mdb->old); 1632 } 1633 1634 mdb->old = mdb; 1635 call_rcu_bh(&mdb->rcu, br_mdb_free); 1636 1637 out: 1638 spin_unlock_bh(&br->multicast_lock); 1639 } 1640 1641 int br_multicast_set_router(struct net_bridge *br, unsigned long val) 1642 { 1643 int err = -ENOENT; 1644 1645 spin_lock_bh(&br->multicast_lock); 1646 if (!netif_running(br->dev)) 1647 goto unlock; 1648 1649 switch (val) { 1650 case 0: 1651 case 2: 1652 del_timer(&br->multicast_router_timer); 1653 /* fall through */ 1654 case 1: 1655 br->multicast_router = val; 1656 err = 0; 1657 break; 1658 1659 default: 1660 err = -EINVAL; 1661 break; 1662 } 1663 1664 unlock: 1665 spin_unlock_bh(&br->multicast_lock); 1666 1667 return err; 1668 } 1669 1670 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) 1671 { 1672 struct net_bridge *br = p->br; 1673 int err = -ENOENT; 1674 1675 spin_lock(&br->multicast_lock); 1676 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) 1677 goto unlock; 1678 1679 switch (val) { 1680 case 0: 1681 case 1: 1682 case 2: 1683 p->multicast_router = val; 1684 err = 0; 1685 1686 if (val < 2 && !hlist_unhashed(&p->rlist)) 1687 hlist_del_init_rcu(&p->rlist); 1688 1689 if (val == 1) 1690 break; 1691 1692 del_timer(&p->multicast_router_timer); 1693 1694 if (val == 0) 1695 break; 1696 1697 br_multicast_add_router(br, p); 1698 break; 1699 1700 default: 1701 err = -EINVAL; 1702 break; 1703 } 1704 1705 unlock: 1706 spin_unlock(&br->multicast_lock); 1707 1708 return err; 1709 } 1710 1711 static void br_multicast_start_querier(struct net_bridge *br) 1712 { 1713 struct net_bridge_port *port; 1714 1715 br_multicast_open(br); 1716 1717 list_for_each_entry(port, &br->port_list, list) { 1718 if (port->state == BR_STATE_DISABLED || 1719 port->state == BR_STATE_BLOCKING) 1720 continue; 1721 1722 __br_multicast_enable_port(port); 1723 } 1724 } 1725 1726 int br_multicast_toggle(struct net_bridge *br, unsigned long val) 1727 { 1728 int err = 0; 1729 struct net_bridge_mdb_htable *mdb; 1730 1731 spin_lock_bh(&br->multicast_lock); 1732 if (br->multicast_disabled == !val) 1733 goto unlock; 1734 1735 br->multicast_disabled = !val; 1736 if (br->multicast_disabled) 1737 goto unlock; 1738 1739 if (!netif_running(br->dev)) 1740 goto unlock; 1741 1742 mdb = mlock_dereference(br->mdb, br); 1743 if (mdb) { 1744 if (mdb->old) { 1745 err = -EEXIST; 1746 rollback: 1747 br->multicast_disabled = !!val; 1748 goto unlock; 1749 } 1750 1751 err = br_mdb_rehash(&br->mdb, mdb->max, 1752 br->hash_elasticity); 1753 if (err) 1754 goto rollback; 1755 } 1756 1757 br_multicast_start_querier(br); 1758 1759 unlock: 1760 spin_unlock_bh(&br->multicast_lock); 1761 1762 return err; 1763 } 1764 1765 int br_multicast_set_querier(struct net_bridge *br, unsigned long val) 1766 { 1767 val = !!val; 1768 1769 spin_lock_bh(&br->multicast_lock); 1770 if (br->multicast_querier == val) 1771 goto unlock; 1772 1773 br->multicast_querier = val; 1774 if (val) 1775 br_multicast_start_querier(br); 1776 1777 unlock: 1778 spin_unlock_bh(&br->multicast_lock); 1779 1780 return 0; 1781 } 1782 1783 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) 1784 { 1785 int err = -ENOENT; 1786 u32 old; 1787 struct net_bridge_mdb_htable *mdb; 1788 1789 spin_lock(&br->multicast_lock); 1790 if (!netif_running(br->dev)) 1791 goto unlock; 1792 1793 err = -EINVAL; 1794 if (!is_power_of_2(val)) 1795 goto unlock; 1796 1797 mdb = mlock_dereference(br->mdb, br); 1798 if (mdb && val < mdb->size) 1799 goto unlock; 1800 1801 err = 0; 1802 1803 old = br->hash_max; 1804 br->hash_max = val; 1805 1806 if (mdb) { 1807 if (mdb->old) { 1808 err = -EEXIST; 1809 rollback: 1810 br->hash_max = old; 1811 goto unlock; 1812 } 1813 1814 err = br_mdb_rehash(&br->mdb, br->hash_max, 1815 br->hash_elasticity); 1816 if (err) 1817 goto rollback; 1818 } 1819 1820 unlock: 1821 spin_unlock(&br->multicast_lock); 1822 1823 return err; 1824 } 1825