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 " 545 "reached, disabling snooping: %s, %d\n", 546 port ? port->dev->name : br->dev->name, max); 547 err = -E2BIG; 548 disable: 549 br->multicast_disabled = 1; 550 goto err; 551 } 552 } 553 554 if (max > mdb->max || elasticity) { 555 if (mdb->old) { 556 if (net_ratelimit()) 557 br_info(br, "Multicast hash table " 558 "on fire: %s\n", 559 port ? port->dev->name : br->dev->name); 560 err = -EEXIST; 561 goto err; 562 } 563 564 err = br_mdb_rehash(&br->mdb, max, elasticity); 565 if (err) { 566 br_warn(br, "Cannot rehash multicast " 567 "hash table, disabling snooping: %s, %d, %d\n", 568 port ? port->dev->name : br->dev->name, 569 mdb->size, err); 570 goto disable; 571 } 572 573 err = -EAGAIN; 574 goto err; 575 } 576 577 return NULL; 578 579 err: 580 mp = ERR_PTR(err); 581 return mp; 582 } 583 584 static struct net_bridge_mdb_entry *br_multicast_new_group( 585 struct net_bridge *br, struct net_bridge_port *port, 586 struct br_ip *group) 587 { 588 struct net_bridge_mdb_htable *mdb; 589 struct net_bridge_mdb_entry *mp; 590 int hash; 591 int err; 592 593 mdb = rcu_dereference_protected(br->mdb, 1); 594 if (!mdb) { 595 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); 596 if (err) 597 return ERR_PTR(err); 598 goto rehash; 599 } 600 601 hash = br_ip_hash(mdb, group); 602 mp = br_multicast_get_group(br, port, group, hash); 603 switch (PTR_ERR(mp)) { 604 case 0: 605 break; 606 607 case -EAGAIN: 608 rehash: 609 mdb = rcu_dereference_protected(br->mdb, 1); 610 hash = br_ip_hash(mdb, group); 611 break; 612 613 default: 614 goto out; 615 } 616 617 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 618 if (unlikely(!mp)) 619 return ERR_PTR(-ENOMEM); 620 621 mp->br = br; 622 mp->addr = *group; 623 setup_timer(&mp->timer, br_multicast_group_expired, 624 (unsigned long)mp); 625 626 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); 627 mdb->size++; 628 629 out: 630 return mp; 631 } 632 633 static int br_multicast_add_group(struct net_bridge *br, 634 struct net_bridge_port *port, 635 struct br_ip *group) 636 { 637 struct net_bridge_mdb_entry *mp; 638 struct net_bridge_port_group *p; 639 struct net_bridge_port_group __rcu **pp; 640 unsigned long now = jiffies; 641 int err; 642 643 spin_lock(&br->multicast_lock); 644 if (!netif_running(br->dev) || 645 (port && port->state == BR_STATE_DISABLED)) 646 goto out; 647 648 mp = br_multicast_new_group(br, port, group); 649 err = PTR_ERR(mp); 650 if (IS_ERR(mp)) 651 goto err; 652 653 if (!port) { 654 mp->mglist = true; 655 mod_timer(&mp->timer, now + br->multicast_membership_interval); 656 goto out; 657 } 658 659 for (pp = &mp->ports; 660 (p = mlock_dereference(*pp, br)) != NULL; 661 pp = &p->next) { 662 if (p->port == port) 663 goto found; 664 if ((unsigned long)p->port < (unsigned long)port) 665 break; 666 } 667 668 p = kzalloc(sizeof(*p), GFP_ATOMIC); 669 err = -ENOMEM; 670 if (unlikely(!p)) 671 goto err; 672 673 p->addr = *group; 674 p->port = port; 675 p->next = *pp; 676 hlist_add_head(&p->mglist, &port->mglist); 677 setup_timer(&p->timer, br_multicast_port_group_expired, 678 (unsigned long)p); 679 680 rcu_assign_pointer(*pp, p); 681 682 found: 683 mod_timer(&p->timer, now + br->multicast_membership_interval); 684 out: 685 err = 0; 686 687 err: 688 spin_unlock(&br->multicast_lock); 689 return err; 690 } 691 692 static int br_ip4_multicast_add_group(struct net_bridge *br, 693 struct net_bridge_port *port, 694 __be32 group) 695 { 696 struct br_ip br_group; 697 698 if (ipv4_is_local_multicast(group)) 699 return 0; 700 701 br_group.u.ip4 = group; 702 br_group.proto = htons(ETH_P_IP); 703 704 return br_multicast_add_group(br, port, &br_group); 705 } 706 707 #if IS_ENABLED(CONFIG_IPV6) 708 static int br_ip6_multicast_add_group(struct net_bridge *br, 709 struct net_bridge_port *port, 710 const struct in6_addr *group) 711 { 712 struct br_ip br_group; 713 714 if (!ipv6_is_transient_multicast(group)) 715 return 0; 716 717 br_group.u.ip6 = *group; 718 br_group.proto = htons(ETH_P_IPV6); 719 720 return br_multicast_add_group(br, port, &br_group); 721 } 722 #endif 723 724 static void br_multicast_router_expired(unsigned long data) 725 { 726 struct net_bridge_port *port = (void *)data; 727 struct net_bridge *br = port->br; 728 729 spin_lock(&br->multicast_lock); 730 if (port->multicast_router != 1 || 731 timer_pending(&port->multicast_router_timer) || 732 hlist_unhashed(&port->rlist)) 733 goto out; 734 735 hlist_del_init_rcu(&port->rlist); 736 737 out: 738 spin_unlock(&br->multicast_lock); 739 } 740 741 static void br_multicast_local_router_expired(unsigned long data) 742 { 743 } 744 745 static void br_multicast_querier_expired(unsigned long data) 746 { 747 struct net_bridge *br = (void *)data; 748 749 spin_lock(&br->multicast_lock); 750 if (!netif_running(br->dev) || br->multicast_disabled) 751 goto out; 752 753 br_multicast_start_querier(br); 754 755 out: 756 spin_unlock(&br->multicast_lock); 757 } 758 759 static void __br_multicast_send_query(struct net_bridge *br, 760 struct net_bridge_port *port, 761 struct br_ip *ip) 762 { 763 struct sk_buff *skb; 764 765 skb = br_multicast_alloc_query(br, ip); 766 if (!skb) 767 return; 768 769 if (port) { 770 __skb_push(skb, sizeof(struct ethhdr)); 771 skb->dev = port->dev; 772 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, 773 dev_queue_xmit); 774 } else 775 netif_rx(skb); 776 } 777 778 static void br_multicast_send_query(struct net_bridge *br, 779 struct net_bridge_port *port, u32 sent) 780 { 781 unsigned long time; 782 struct br_ip br_group; 783 784 if (!netif_running(br->dev) || br->multicast_disabled || 785 !br->multicast_querier || 786 timer_pending(&br->multicast_querier_timer)) 787 return; 788 789 memset(&br_group.u, 0, sizeof(br_group.u)); 790 791 br_group.proto = htons(ETH_P_IP); 792 __br_multicast_send_query(br, port, &br_group); 793 794 #if IS_ENABLED(CONFIG_IPV6) 795 br_group.proto = htons(ETH_P_IPV6); 796 __br_multicast_send_query(br, port, &br_group); 797 #endif 798 799 time = jiffies; 800 time += sent < br->multicast_startup_query_count ? 801 br->multicast_startup_query_interval : 802 br->multicast_query_interval; 803 mod_timer(port ? &port->multicast_query_timer : 804 &br->multicast_query_timer, time); 805 } 806 807 static void br_multicast_port_query_expired(unsigned long data) 808 { 809 struct net_bridge_port *port = (void *)data; 810 struct net_bridge *br = port->br; 811 812 spin_lock(&br->multicast_lock); 813 if (port->state == BR_STATE_DISABLED || 814 port->state == BR_STATE_BLOCKING) 815 goto out; 816 817 if (port->multicast_startup_queries_sent < 818 br->multicast_startup_query_count) 819 port->multicast_startup_queries_sent++; 820 821 br_multicast_send_query(port->br, port, 822 port->multicast_startup_queries_sent); 823 824 out: 825 spin_unlock(&br->multicast_lock); 826 } 827 828 void br_multicast_add_port(struct net_bridge_port *port) 829 { 830 port->multicast_router = 1; 831 832 setup_timer(&port->multicast_router_timer, br_multicast_router_expired, 833 (unsigned long)port); 834 setup_timer(&port->multicast_query_timer, 835 br_multicast_port_query_expired, (unsigned long)port); 836 } 837 838 void br_multicast_del_port(struct net_bridge_port *port) 839 { 840 del_timer_sync(&port->multicast_router_timer); 841 } 842 843 static void __br_multicast_enable_port(struct net_bridge_port *port) 844 { 845 port->multicast_startup_queries_sent = 0; 846 847 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || 848 del_timer(&port->multicast_query_timer)) 849 mod_timer(&port->multicast_query_timer, jiffies); 850 } 851 852 void br_multicast_enable_port(struct net_bridge_port *port) 853 { 854 struct net_bridge *br = port->br; 855 856 spin_lock(&br->multicast_lock); 857 if (br->multicast_disabled || !netif_running(br->dev)) 858 goto out; 859 860 __br_multicast_enable_port(port); 861 862 out: 863 spin_unlock(&br->multicast_lock); 864 } 865 866 void br_multicast_disable_port(struct net_bridge_port *port) 867 { 868 struct net_bridge *br = port->br; 869 struct net_bridge_port_group *pg; 870 struct hlist_node *p, *n; 871 872 spin_lock(&br->multicast_lock); 873 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist) 874 br_multicast_del_pg(br, pg); 875 876 if (!hlist_unhashed(&port->rlist)) 877 hlist_del_init_rcu(&port->rlist); 878 del_timer(&port->multicast_router_timer); 879 del_timer(&port->multicast_query_timer); 880 spin_unlock(&br->multicast_lock); 881 } 882 883 static int br_ip4_multicast_igmp3_report(struct net_bridge *br, 884 struct net_bridge_port *port, 885 struct sk_buff *skb) 886 { 887 struct igmpv3_report *ih; 888 struct igmpv3_grec *grec; 889 int i; 890 int len; 891 int num; 892 int type; 893 int err = 0; 894 __be32 group; 895 896 if (!pskb_may_pull(skb, sizeof(*ih))) 897 return -EINVAL; 898 899 ih = igmpv3_report_hdr(skb); 900 num = ntohs(ih->ngrec); 901 len = sizeof(*ih); 902 903 for (i = 0; i < num; i++) { 904 len += sizeof(*grec); 905 if (!pskb_may_pull(skb, len)) 906 return -EINVAL; 907 908 grec = (void *)(skb->data + len - sizeof(*grec)); 909 group = grec->grec_mca; 910 type = grec->grec_type; 911 912 len += ntohs(grec->grec_nsrcs) * 4; 913 if (!pskb_may_pull(skb, len)) 914 return -EINVAL; 915 916 /* We treat this as an IGMPv2 report for now. */ 917 switch (type) { 918 case IGMPV3_MODE_IS_INCLUDE: 919 case IGMPV3_MODE_IS_EXCLUDE: 920 case IGMPV3_CHANGE_TO_INCLUDE: 921 case IGMPV3_CHANGE_TO_EXCLUDE: 922 case IGMPV3_ALLOW_NEW_SOURCES: 923 case IGMPV3_BLOCK_OLD_SOURCES: 924 break; 925 926 default: 927 continue; 928 } 929 930 err = br_ip4_multicast_add_group(br, port, group); 931 if (err) 932 break; 933 } 934 935 return err; 936 } 937 938 #if IS_ENABLED(CONFIG_IPV6) 939 static int br_ip6_multicast_mld2_report(struct net_bridge *br, 940 struct net_bridge_port *port, 941 struct sk_buff *skb) 942 { 943 struct icmp6hdr *icmp6h; 944 struct mld2_grec *grec; 945 int i; 946 int len; 947 int num; 948 int err = 0; 949 950 if (!pskb_may_pull(skb, sizeof(*icmp6h))) 951 return -EINVAL; 952 953 icmp6h = icmp6_hdr(skb); 954 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 955 len = sizeof(*icmp6h); 956 957 for (i = 0; i < num; i++) { 958 __be16 *nsrcs, _nsrcs; 959 960 nsrcs = skb_header_pointer(skb, 961 len + offsetof(struct mld2_grec, 962 grec_nsrcs), 963 sizeof(_nsrcs), &_nsrcs); 964 if (!nsrcs) 965 return -EINVAL; 966 967 if (!pskb_may_pull(skb, 968 len + sizeof(*grec) + 969 sizeof(struct in6_addr) * ntohs(*nsrcs))) 970 return -EINVAL; 971 972 grec = (struct mld2_grec *)(skb->data + len); 973 len += sizeof(*grec) + 974 sizeof(struct in6_addr) * ntohs(*nsrcs); 975 976 /* We treat these as MLDv1 reports for now. */ 977 switch (grec->grec_type) { 978 case MLD2_MODE_IS_INCLUDE: 979 case MLD2_MODE_IS_EXCLUDE: 980 case MLD2_CHANGE_TO_INCLUDE: 981 case MLD2_CHANGE_TO_EXCLUDE: 982 case MLD2_ALLOW_NEW_SOURCES: 983 case MLD2_BLOCK_OLD_SOURCES: 984 break; 985 986 default: 987 continue; 988 } 989 990 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca); 991 if (!err) 992 break; 993 } 994 995 return err; 996 } 997 #endif 998 999 /* 1000 * Add port to rotuer_list 1001 * list is maintained ordered by pointer value 1002 * and locked by br->multicast_lock and RCU 1003 */ 1004 static void br_multicast_add_router(struct net_bridge *br, 1005 struct net_bridge_port *port) 1006 { 1007 struct net_bridge_port *p; 1008 struct hlist_node *n, *slot = NULL; 1009 1010 hlist_for_each_entry(p, n, &br->router_list, rlist) { 1011 if ((unsigned long) port >= (unsigned long) p) 1012 break; 1013 slot = n; 1014 } 1015 1016 if (slot) 1017 hlist_add_after_rcu(slot, &port->rlist); 1018 else 1019 hlist_add_head_rcu(&port->rlist, &br->router_list); 1020 } 1021 1022 static void br_multicast_mark_router(struct net_bridge *br, 1023 struct net_bridge_port *port) 1024 { 1025 unsigned long now = jiffies; 1026 1027 if (!port) { 1028 if (br->multicast_router == 1) 1029 mod_timer(&br->multicast_router_timer, 1030 now + br->multicast_querier_interval); 1031 return; 1032 } 1033 1034 if (port->multicast_router != 1) 1035 return; 1036 1037 if (!hlist_unhashed(&port->rlist)) 1038 goto timer; 1039 1040 br_multicast_add_router(br, port); 1041 1042 timer: 1043 mod_timer(&port->multicast_router_timer, 1044 now + br->multicast_querier_interval); 1045 } 1046 1047 static void br_multicast_query_received(struct net_bridge *br, 1048 struct net_bridge_port *port, 1049 int saddr) 1050 { 1051 if (saddr) 1052 mod_timer(&br->multicast_querier_timer, 1053 jiffies + br->multicast_querier_interval); 1054 else if (timer_pending(&br->multicast_querier_timer)) 1055 return; 1056 1057 br_multicast_mark_router(br, port); 1058 } 1059 1060 static int br_ip4_multicast_query(struct net_bridge *br, 1061 struct net_bridge_port *port, 1062 struct sk_buff *skb) 1063 { 1064 const struct iphdr *iph = ip_hdr(skb); 1065 struct igmphdr *ih = igmp_hdr(skb); 1066 struct net_bridge_mdb_entry *mp; 1067 struct igmpv3_query *ih3; 1068 struct net_bridge_port_group *p; 1069 struct net_bridge_port_group __rcu **pp; 1070 unsigned long max_delay; 1071 unsigned long now = jiffies; 1072 __be32 group; 1073 int err = 0; 1074 1075 spin_lock(&br->multicast_lock); 1076 if (!netif_running(br->dev) || 1077 (port && port->state == BR_STATE_DISABLED)) 1078 goto out; 1079 1080 br_multicast_query_received(br, port, !!iph->saddr); 1081 1082 group = ih->group; 1083 1084 if (skb->len == sizeof(*ih)) { 1085 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 1086 1087 if (!max_delay) { 1088 max_delay = 10 * HZ; 1089 group = 0; 1090 } 1091 } else { 1092 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) { 1093 err = -EINVAL; 1094 goto out; 1095 } 1096 1097 ih3 = igmpv3_query_hdr(skb); 1098 if (ih3->nsrcs) 1099 goto out; 1100 1101 max_delay = ih3->code ? 1102 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 1103 } 1104 1105 if (!group) 1106 goto out; 1107 1108 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group); 1109 if (!mp) 1110 goto out; 1111 1112 max_delay *= br->multicast_last_member_count; 1113 1114 if (mp->mglist && 1115 (timer_pending(&mp->timer) ? 1116 time_after(mp->timer.expires, now + max_delay) : 1117 try_to_del_timer_sync(&mp->timer) >= 0)) 1118 mod_timer(&mp->timer, now + max_delay); 1119 1120 for (pp = &mp->ports; 1121 (p = mlock_dereference(*pp, br)) != NULL; 1122 pp = &p->next) { 1123 if (timer_pending(&p->timer) ? 1124 time_after(p->timer.expires, now + max_delay) : 1125 try_to_del_timer_sync(&p->timer) >= 0) 1126 mod_timer(&p->timer, now + max_delay); 1127 } 1128 1129 out: 1130 spin_unlock(&br->multicast_lock); 1131 return err; 1132 } 1133 1134 #if IS_ENABLED(CONFIG_IPV6) 1135 static int br_ip6_multicast_query(struct net_bridge *br, 1136 struct net_bridge_port *port, 1137 struct sk_buff *skb) 1138 { 1139 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 1140 struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb); 1141 struct net_bridge_mdb_entry *mp; 1142 struct mld2_query *mld2q; 1143 struct net_bridge_port_group *p; 1144 struct net_bridge_port_group __rcu **pp; 1145 unsigned long max_delay; 1146 unsigned long now = jiffies; 1147 const struct in6_addr *group = NULL; 1148 int err = 0; 1149 1150 spin_lock(&br->multicast_lock); 1151 if (!netif_running(br->dev) || 1152 (port && port->state == BR_STATE_DISABLED)) 1153 goto out; 1154 1155 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr)); 1156 1157 if (skb->len == sizeof(*mld)) { 1158 if (!pskb_may_pull(skb, sizeof(*mld))) { 1159 err = -EINVAL; 1160 goto out; 1161 } 1162 mld = (struct mld_msg *) icmp6_hdr(skb); 1163 max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay)); 1164 if (max_delay) 1165 group = &mld->mld_mca; 1166 } else if (skb->len >= sizeof(*mld2q)) { 1167 if (!pskb_may_pull(skb, sizeof(*mld2q))) { 1168 err = -EINVAL; 1169 goto out; 1170 } 1171 mld2q = (struct mld2_query *)icmp6_hdr(skb); 1172 if (!mld2q->mld2q_nsrcs) 1173 group = &mld2q->mld2q_mca; 1174 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1; 1175 } 1176 1177 if (!group) 1178 goto out; 1179 1180 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group); 1181 if (!mp) 1182 goto out; 1183 1184 max_delay *= br->multicast_last_member_count; 1185 if (mp->mglist && 1186 (timer_pending(&mp->timer) ? 1187 time_after(mp->timer.expires, now + max_delay) : 1188 try_to_del_timer_sync(&mp->timer) >= 0)) 1189 mod_timer(&mp->timer, now + max_delay); 1190 1191 for (pp = &mp->ports; 1192 (p = mlock_dereference(*pp, br)) != NULL; 1193 pp = &p->next) { 1194 if (timer_pending(&p->timer) ? 1195 time_after(p->timer.expires, now + max_delay) : 1196 try_to_del_timer_sync(&p->timer) >= 0) 1197 mod_timer(&p->timer, now + max_delay); 1198 } 1199 1200 out: 1201 spin_unlock(&br->multicast_lock); 1202 return err; 1203 } 1204 #endif 1205 1206 static void br_multicast_leave_group(struct net_bridge *br, 1207 struct net_bridge_port *port, 1208 struct br_ip *group) 1209 { 1210 struct net_bridge_mdb_htable *mdb; 1211 struct net_bridge_mdb_entry *mp; 1212 struct net_bridge_port_group *p; 1213 unsigned long now; 1214 unsigned long time; 1215 1216 spin_lock(&br->multicast_lock); 1217 if (!netif_running(br->dev) || 1218 (port && port->state == BR_STATE_DISABLED) || 1219 timer_pending(&br->multicast_querier_timer)) 1220 goto out; 1221 1222 mdb = mlock_dereference(br->mdb, br); 1223 mp = br_mdb_ip_get(mdb, group); 1224 if (!mp) 1225 goto out; 1226 1227 now = jiffies; 1228 time = now + br->multicast_last_member_count * 1229 br->multicast_last_member_interval; 1230 1231 if (!port) { 1232 if (mp->mglist && 1233 (timer_pending(&mp->timer) ? 1234 time_after(mp->timer.expires, time) : 1235 try_to_del_timer_sync(&mp->timer) >= 0)) { 1236 mod_timer(&mp->timer, time); 1237 } 1238 1239 goto out; 1240 } 1241 1242 for (p = mlock_dereference(mp->ports, br); 1243 p != NULL; 1244 p = mlock_dereference(p->next, br)) { 1245 if (p->port != port) 1246 continue; 1247 1248 if (!hlist_unhashed(&p->mglist) && 1249 (timer_pending(&p->timer) ? 1250 time_after(p->timer.expires, time) : 1251 try_to_del_timer_sync(&p->timer) >= 0)) { 1252 mod_timer(&p->timer, time); 1253 } 1254 1255 break; 1256 } 1257 1258 out: 1259 spin_unlock(&br->multicast_lock); 1260 } 1261 1262 static void br_ip4_multicast_leave_group(struct net_bridge *br, 1263 struct net_bridge_port *port, 1264 __be32 group) 1265 { 1266 struct br_ip br_group; 1267 1268 if (ipv4_is_local_multicast(group)) 1269 return; 1270 1271 br_group.u.ip4 = group; 1272 br_group.proto = htons(ETH_P_IP); 1273 1274 br_multicast_leave_group(br, port, &br_group); 1275 } 1276 1277 #if IS_ENABLED(CONFIG_IPV6) 1278 static void br_ip6_multicast_leave_group(struct net_bridge *br, 1279 struct net_bridge_port *port, 1280 const struct in6_addr *group) 1281 { 1282 struct br_ip br_group; 1283 1284 if (!ipv6_is_transient_multicast(group)) 1285 return; 1286 1287 br_group.u.ip6 = *group; 1288 br_group.proto = htons(ETH_P_IPV6); 1289 1290 br_multicast_leave_group(br, port, &br_group); 1291 } 1292 #endif 1293 1294 static int br_multicast_ipv4_rcv(struct net_bridge *br, 1295 struct net_bridge_port *port, 1296 struct sk_buff *skb) 1297 { 1298 struct sk_buff *skb2 = skb; 1299 const struct iphdr *iph; 1300 struct igmphdr *ih; 1301 unsigned int len; 1302 unsigned int offset; 1303 int err; 1304 1305 /* We treat OOM as packet loss for now. */ 1306 if (!pskb_may_pull(skb, sizeof(*iph))) 1307 return -EINVAL; 1308 1309 iph = ip_hdr(skb); 1310 1311 if (iph->ihl < 5 || iph->version != 4) 1312 return -EINVAL; 1313 1314 if (!pskb_may_pull(skb, ip_hdrlen(skb))) 1315 return -EINVAL; 1316 1317 iph = ip_hdr(skb); 1318 1319 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1320 return -EINVAL; 1321 1322 if (iph->protocol != IPPROTO_IGMP) { 1323 if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP) 1324 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1325 return 0; 1326 } 1327 1328 len = ntohs(iph->tot_len); 1329 if (skb->len < len || len < ip_hdrlen(skb)) 1330 return -EINVAL; 1331 1332 if (skb->len > len) { 1333 skb2 = skb_clone(skb, GFP_ATOMIC); 1334 if (!skb2) 1335 return -ENOMEM; 1336 1337 err = pskb_trim_rcsum(skb2, len); 1338 if (err) 1339 goto err_out; 1340 } 1341 1342 len -= ip_hdrlen(skb2); 1343 offset = skb_network_offset(skb2) + ip_hdrlen(skb2); 1344 __skb_pull(skb2, offset); 1345 skb_reset_transport_header(skb2); 1346 1347 err = -EINVAL; 1348 if (!pskb_may_pull(skb2, sizeof(*ih))) 1349 goto out; 1350 1351 switch (skb2->ip_summed) { 1352 case CHECKSUM_COMPLETE: 1353 if (!csum_fold(skb2->csum)) 1354 break; 1355 /* fall through */ 1356 case CHECKSUM_NONE: 1357 skb2->csum = 0; 1358 if (skb_checksum_complete(skb2)) 1359 goto out; 1360 } 1361 1362 err = 0; 1363 1364 BR_INPUT_SKB_CB(skb)->igmp = 1; 1365 ih = igmp_hdr(skb2); 1366 1367 switch (ih->type) { 1368 case IGMP_HOST_MEMBERSHIP_REPORT: 1369 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1370 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1371 err = br_ip4_multicast_add_group(br, port, ih->group); 1372 break; 1373 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1374 err = br_ip4_multicast_igmp3_report(br, port, skb2); 1375 break; 1376 case IGMP_HOST_MEMBERSHIP_QUERY: 1377 err = br_ip4_multicast_query(br, port, skb2); 1378 break; 1379 case IGMP_HOST_LEAVE_MESSAGE: 1380 br_ip4_multicast_leave_group(br, port, ih->group); 1381 break; 1382 } 1383 1384 out: 1385 __skb_push(skb2, offset); 1386 err_out: 1387 if (skb2 != skb) 1388 kfree_skb(skb2); 1389 return err; 1390 } 1391 1392 #if IS_ENABLED(CONFIG_IPV6) 1393 static int br_multicast_ipv6_rcv(struct net_bridge *br, 1394 struct net_bridge_port *port, 1395 struct sk_buff *skb) 1396 { 1397 struct sk_buff *skb2; 1398 const struct ipv6hdr *ip6h; 1399 u8 icmp6_type; 1400 u8 nexthdr; 1401 __be16 frag_off; 1402 unsigned int len; 1403 int offset; 1404 int err; 1405 1406 if (!pskb_may_pull(skb, sizeof(*ip6h))) 1407 return -EINVAL; 1408 1409 ip6h = ipv6_hdr(skb); 1410 1411 /* 1412 * We're interested in MLD messages only. 1413 * - Version is 6 1414 * - MLD has always Router Alert hop-by-hop option 1415 * - But we do not support jumbrograms. 1416 */ 1417 if (ip6h->version != 6 || 1418 ip6h->nexthdr != IPPROTO_HOPOPTS || 1419 ip6h->payload_len == 0) 1420 return 0; 1421 1422 len = ntohs(ip6h->payload_len) + sizeof(*ip6h); 1423 if (skb->len < len) 1424 return -EINVAL; 1425 1426 nexthdr = ip6h->nexthdr; 1427 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off); 1428 1429 if (offset < 0 || nexthdr != IPPROTO_ICMPV6) 1430 return 0; 1431 1432 /* Okay, we found ICMPv6 header */ 1433 skb2 = skb_clone(skb, GFP_ATOMIC); 1434 if (!skb2) 1435 return -ENOMEM; 1436 1437 err = -EINVAL; 1438 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr))) 1439 goto out; 1440 1441 len -= offset - skb_network_offset(skb2); 1442 1443 __skb_pull(skb2, offset); 1444 skb_reset_transport_header(skb2); 1445 skb_postpull_rcsum(skb2, skb_network_header(skb2), 1446 skb_network_header_len(skb2)); 1447 1448 icmp6_type = icmp6_hdr(skb2)->icmp6_type; 1449 1450 switch (icmp6_type) { 1451 case ICMPV6_MGM_QUERY: 1452 case ICMPV6_MGM_REPORT: 1453 case ICMPV6_MGM_REDUCTION: 1454 case ICMPV6_MLD2_REPORT: 1455 break; 1456 default: 1457 err = 0; 1458 goto out; 1459 } 1460 1461 /* Okay, we found MLD message. Check further. */ 1462 if (skb2->len > len) { 1463 err = pskb_trim_rcsum(skb2, len); 1464 if (err) 1465 goto out; 1466 err = -EINVAL; 1467 } 1468 1469 ip6h = ipv6_hdr(skb2); 1470 1471 switch (skb2->ip_summed) { 1472 case CHECKSUM_COMPLETE: 1473 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len, 1474 IPPROTO_ICMPV6, skb2->csum)) 1475 break; 1476 /*FALLTHROUGH*/ 1477 case CHECKSUM_NONE: 1478 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, 1479 &ip6h->daddr, 1480 skb2->len, 1481 IPPROTO_ICMPV6, 0)); 1482 if (__skb_checksum_complete(skb2)) 1483 goto out; 1484 } 1485 1486 err = 0; 1487 1488 BR_INPUT_SKB_CB(skb)->igmp = 1; 1489 1490 switch (icmp6_type) { 1491 case ICMPV6_MGM_REPORT: 1492 { 1493 struct mld_msg *mld; 1494 if (!pskb_may_pull(skb2, sizeof(*mld))) { 1495 err = -EINVAL; 1496 goto out; 1497 } 1498 mld = (struct mld_msg *)skb_transport_header(skb2); 1499 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1500 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca); 1501 break; 1502 } 1503 case ICMPV6_MLD2_REPORT: 1504 err = br_ip6_multicast_mld2_report(br, port, skb2); 1505 break; 1506 case ICMPV6_MGM_QUERY: 1507 err = br_ip6_multicast_query(br, port, skb2); 1508 break; 1509 case ICMPV6_MGM_REDUCTION: 1510 { 1511 struct mld_msg *mld; 1512 if (!pskb_may_pull(skb2, sizeof(*mld))) { 1513 err = -EINVAL; 1514 goto out; 1515 } 1516 mld = (struct mld_msg *)skb_transport_header(skb2); 1517 br_ip6_multicast_leave_group(br, port, &mld->mld_mca); 1518 } 1519 } 1520 1521 out: 1522 kfree_skb(skb2); 1523 return err; 1524 } 1525 #endif 1526 1527 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 1528 struct sk_buff *skb) 1529 { 1530 BR_INPUT_SKB_CB(skb)->igmp = 0; 1531 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 1532 1533 if (br->multicast_disabled) 1534 return 0; 1535 1536 switch (skb->protocol) { 1537 case htons(ETH_P_IP): 1538 return br_multicast_ipv4_rcv(br, port, skb); 1539 #if IS_ENABLED(CONFIG_IPV6) 1540 case htons(ETH_P_IPV6): 1541 return br_multicast_ipv6_rcv(br, port, skb); 1542 #endif 1543 } 1544 1545 return 0; 1546 } 1547 1548 static void br_multicast_query_expired(unsigned long data) 1549 { 1550 struct net_bridge *br = (void *)data; 1551 1552 spin_lock(&br->multicast_lock); 1553 if (br->multicast_startup_queries_sent < 1554 br->multicast_startup_query_count) 1555 br->multicast_startup_queries_sent++; 1556 1557 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent); 1558 1559 spin_unlock(&br->multicast_lock); 1560 } 1561 1562 void br_multicast_init(struct net_bridge *br) 1563 { 1564 br->hash_elasticity = 4; 1565 br->hash_max = 512; 1566 1567 br->multicast_router = 1; 1568 br->multicast_querier = 0; 1569 br->multicast_last_member_count = 2; 1570 br->multicast_startup_query_count = 2; 1571 1572 br->multicast_last_member_interval = HZ; 1573 br->multicast_query_response_interval = 10 * HZ; 1574 br->multicast_startup_query_interval = 125 * HZ / 4; 1575 br->multicast_query_interval = 125 * HZ; 1576 br->multicast_querier_interval = 255 * HZ; 1577 br->multicast_membership_interval = 260 * HZ; 1578 1579 spin_lock_init(&br->multicast_lock); 1580 setup_timer(&br->multicast_router_timer, 1581 br_multicast_local_router_expired, 0); 1582 setup_timer(&br->multicast_querier_timer, 1583 br_multicast_querier_expired, (unsigned long)br); 1584 setup_timer(&br->multicast_query_timer, br_multicast_query_expired, 1585 (unsigned long)br); 1586 } 1587 1588 void br_multicast_open(struct net_bridge *br) 1589 { 1590 br->multicast_startup_queries_sent = 0; 1591 1592 if (br->multicast_disabled) 1593 return; 1594 1595 mod_timer(&br->multicast_query_timer, jiffies); 1596 } 1597 1598 void br_multicast_stop(struct net_bridge *br) 1599 { 1600 struct net_bridge_mdb_htable *mdb; 1601 struct net_bridge_mdb_entry *mp; 1602 struct hlist_node *p, *n; 1603 u32 ver; 1604 int i; 1605 1606 del_timer_sync(&br->multicast_router_timer); 1607 del_timer_sync(&br->multicast_querier_timer); 1608 del_timer_sync(&br->multicast_query_timer); 1609 1610 spin_lock_bh(&br->multicast_lock); 1611 mdb = mlock_dereference(br->mdb, br); 1612 if (!mdb) 1613 goto out; 1614 1615 br->mdb = NULL; 1616 1617 ver = mdb->ver; 1618 for (i = 0; i < mdb->max; i++) { 1619 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i], 1620 hlist[ver]) { 1621 del_timer(&mp->timer); 1622 call_rcu_bh(&mp->rcu, br_multicast_free_group); 1623 } 1624 } 1625 1626 if (mdb->old) { 1627 spin_unlock_bh(&br->multicast_lock); 1628 rcu_barrier_bh(); 1629 spin_lock_bh(&br->multicast_lock); 1630 WARN_ON(mdb->old); 1631 } 1632 1633 mdb->old = mdb; 1634 call_rcu_bh(&mdb->rcu, br_mdb_free); 1635 1636 out: 1637 spin_unlock_bh(&br->multicast_lock); 1638 } 1639 1640 int br_multicast_set_router(struct net_bridge *br, unsigned long val) 1641 { 1642 int err = -ENOENT; 1643 1644 spin_lock_bh(&br->multicast_lock); 1645 if (!netif_running(br->dev)) 1646 goto unlock; 1647 1648 switch (val) { 1649 case 0: 1650 case 2: 1651 del_timer(&br->multicast_router_timer); 1652 /* fall through */ 1653 case 1: 1654 br->multicast_router = val; 1655 err = 0; 1656 break; 1657 1658 default: 1659 err = -EINVAL; 1660 break; 1661 } 1662 1663 unlock: 1664 spin_unlock_bh(&br->multicast_lock); 1665 1666 return err; 1667 } 1668 1669 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) 1670 { 1671 struct net_bridge *br = p->br; 1672 int err = -ENOENT; 1673 1674 spin_lock(&br->multicast_lock); 1675 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) 1676 goto unlock; 1677 1678 switch (val) { 1679 case 0: 1680 case 1: 1681 case 2: 1682 p->multicast_router = val; 1683 err = 0; 1684 1685 if (val < 2 && !hlist_unhashed(&p->rlist)) 1686 hlist_del_init_rcu(&p->rlist); 1687 1688 if (val == 1) 1689 break; 1690 1691 del_timer(&p->multicast_router_timer); 1692 1693 if (val == 0) 1694 break; 1695 1696 br_multicast_add_router(br, p); 1697 break; 1698 1699 default: 1700 err = -EINVAL; 1701 break; 1702 } 1703 1704 unlock: 1705 spin_unlock(&br->multicast_lock); 1706 1707 return err; 1708 } 1709 1710 static void br_multicast_start_querier(struct net_bridge *br) 1711 { 1712 struct net_bridge_port *port; 1713 1714 br_multicast_open(br); 1715 1716 list_for_each_entry(port, &br->port_list, list) { 1717 if (port->state == BR_STATE_DISABLED || 1718 port->state == BR_STATE_BLOCKING) 1719 continue; 1720 1721 __br_multicast_enable_port(port); 1722 } 1723 } 1724 1725 int br_multicast_toggle(struct net_bridge *br, unsigned long val) 1726 { 1727 int err = 0; 1728 struct net_bridge_mdb_htable *mdb; 1729 1730 spin_lock_bh(&br->multicast_lock); 1731 if (br->multicast_disabled == !val) 1732 goto unlock; 1733 1734 br->multicast_disabled = !val; 1735 if (br->multicast_disabled) 1736 goto unlock; 1737 1738 if (!netif_running(br->dev)) 1739 goto unlock; 1740 1741 mdb = mlock_dereference(br->mdb, br); 1742 if (mdb) { 1743 if (mdb->old) { 1744 err = -EEXIST; 1745 rollback: 1746 br->multicast_disabled = !!val; 1747 goto unlock; 1748 } 1749 1750 err = br_mdb_rehash(&br->mdb, mdb->max, 1751 br->hash_elasticity); 1752 if (err) 1753 goto rollback; 1754 } 1755 1756 br_multicast_start_querier(br); 1757 1758 unlock: 1759 spin_unlock_bh(&br->multicast_lock); 1760 1761 return err; 1762 } 1763 1764 int br_multicast_set_querier(struct net_bridge *br, unsigned long val) 1765 { 1766 val = !!val; 1767 1768 spin_lock_bh(&br->multicast_lock); 1769 if (br->multicast_querier == val) 1770 goto unlock; 1771 1772 br->multicast_querier = val; 1773 if (val) 1774 br_multicast_start_querier(br); 1775 1776 unlock: 1777 spin_unlock_bh(&br->multicast_lock); 1778 1779 return 0; 1780 } 1781 1782 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) 1783 { 1784 int err = -ENOENT; 1785 u32 old; 1786 struct net_bridge_mdb_htable *mdb; 1787 1788 spin_lock(&br->multicast_lock); 1789 if (!netif_running(br->dev)) 1790 goto unlock; 1791 1792 err = -EINVAL; 1793 if (!is_power_of_2(val)) 1794 goto unlock; 1795 1796 mdb = mlock_dereference(br->mdb, br); 1797 if (mdb && val < mdb->size) 1798 goto unlock; 1799 1800 err = 0; 1801 1802 old = br->hash_max; 1803 br->hash_max = val; 1804 1805 if (mdb) { 1806 if (mdb->old) { 1807 err = -EEXIST; 1808 rollback: 1809 br->hash_max = old; 1810 goto unlock; 1811 } 1812 1813 err = br_mdb_rehash(&br->mdb, br->hash_max, 1814 br->hash_elasticity); 1815 if (err) 1816 goto rollback; 1817 } 1818 1819 unlock: 1820 spin_unlock(&br->multicast_lock); 1821 1822 return err; 1823 } 1824