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/ip6_checksum.h> 31 #endif 32 33 #include "br_private.h" 34 35 static void br_multicast_start_querier(struct net_bridge *br); 36 unsigned int br_mdb_rehash_seq; 37 38 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) 39 { 40 if (a->proto != b->proto) 41 return 0; 42 if (a->vid != b->vid) 43 return 0; 44 switch (a->proto) { 45 case htons(ETH_P_IP): 46 return a->u.ip4 == b->u.ip4; 47 #if IS_ENABLED(CONFIG_IPV6) 48 case htons(ETH_P_IPV6): 49 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); 50 #endif 51 } 52 return 0; 53 } 54 55 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip, 56 __u16 vid) 57 { 58 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1); 59 } 60 61 #if IS_ENABLED(CONFIG_IPV6) 62 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, 63 const struct in6_addr *ip, 64 __u16 vid) 65 { 66 return jhash_2words(ipv6_addr_hash(ip), vid, 67 mdb->secret) & (mdb->max - 1); 68 } 69 #endif 70 71 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, 72 struct br_ip *ip) 73 { 74 switch (ip->proto) { 75 case htons(ETH_P_IP): 76 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid); 77 #if IS_ENABLED(CONFIG_IPV6) 78 case htons(ETH_P_IPV6): 79 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid); 80 #endif 81 } 82 return 0; 83 } 84 85 static struct net_bridge_mdb_entry *__br_mdb_ip_get( 86 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) 87 { 88 struct net_bridge_mdb_entry *mp; 89 90 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) { 91 if (br_ip_equal(&mp->addr, dst)) 92 return mp; 93 } 94 95 return NULL; 96 } 97 98 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, 99 struct br_ip *dst) 100 { 101 if (!mdb) 102 return NULL; 103 104 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); 105 } 106 107 static struct net_bridge_mdb_entry *br_mdb_ip4_get( 108 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid) 109 { 110 struct br_ip br_dst; 111 112 br_dst.u.ip4 = dst; 113 br_dst.proto = htons(ETH_P_IP); 114 br_dst.vid = vid; 115 116 return br_mdb_ip_get(mdb, &br_dst); 117 } 118 119 #if IS_ENABLED(CONFIG_IPV6) 120 static struct net_bridge_mdb_entry *br_mdb_ip6_get( 121 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst, 122 __u16 vid) 123 { 124 struct br_ip br_dst; 125 126 br_dst.u.ip6 = *dst; 127 br_dst.proto = htons(ETH_P_IPV6); 128 br_dst.vid = vid; 129 130 return br_mdb_ip_get(mdb, &br_dst); 131 } 132 #endif 133 134 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 135 struct sk_buff *skb) 136 { 137 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb); 138 struct br_ip ip; 139 140 if (br->multicast_disabled) 141 return NULL; 142 143 if (BR_INPUT_SKB_CB(skb)->igmp) 144 return NULL; 145 146 ip.proto = skb->protocol; 147 148 switch (skb->protocol) { 149 case htons(ETH_P_IP): 150 ip.u.ip4 = ip_hdr(skb)->daddr; 151 break; 152 #if IS_ENABLED(CONFIG_IPV6) 153 case htons(ETH_P_IPV6): 154 ip.u.ip6 = ipv6_hdr(skb)->daddr; 155 break; 156 #endif 157 default: 158 return NULL; 159 } 160 161 return br_mdb_ip_get(mdb, &ip); 162 } 163 164 static void br_mdb_free(struct rcu_head *head) 165 { 166 struct net_bridge_mdb_htable *mdb = 167 container_of(head, struct net_bridge_mdb_htable, rcu); 168 struct net_bridge_mdb_htable *old = mdb->old; 169 170 mdb->old = NULL; 171 kfree(old->mhash); 172 kfree(old); 173 } 174 175 static int br_mdb_copy(struct net_bridge_mdb_htable *new, 176 struct net_bridge_mdb_htable *old, 177 int elasticity) 178 { 179 struct net_bridge_mdb_entry *mp; 180 int maxlen; 181 int len; 182 int i; 183 184 for (i = 0; i < old->max; i++) 185 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver]) 186 hlist_add_head(&mp->hlist[new->ver], 187 &new->mhash[br_ip_hash(new, &mp->addr)]); 188 189 if (!elasticity) 190 return 0; 191 192 maxlen = 0; 193 for (i = 0; i < new->max; i++) { 194 len = 0; 195 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver]) 196 len++; 197 if (len > maxlen) 198 maxlen = len; 199 } 200 201 return maxlen > elasticity ? -EINVAL : 0; 202 } 203 204 void br_multicast_free_pg(struct rcu_head *head) 205 { 206 struct net_bridge_port_group *p = 207 container_of(head, struct net_bridge_port_group, rcu); 208 209 kfree(p); 210 } 211 212 static void br_multicast_free_group(struct rcu_head *head) 213 { 214 struct net_bridge_mdb_entry *mp = 215 container_of(head, struct net_bridge_mdb_entry, rcu); 216 217 kfree(mp); 218 } 219 220 static void br_multicast_group_expired(unsigned long data) 221 { 222 struct net_bridge_mdb_entry *mp = (void *)data; 223 struct net_bridge *br = mp->br; 224 struct net_bridge_mdb_htable *mdb; 225 226 spin_lock(&br->multicast_lock); 227 if (!netif_running(br->dev) || timer_pending(&mp->timer)) 228 goto out; 229 230 mp->mglist = false; 231 232 if (mp->ports) 233 goto out; 234 235 mdb = mlock_dereference(br->mdb, br); 236 237 hlist_del_rcu(&mp->hlist[mdb->ver]); 238 mdb->size--; 239 240 call_rcu_bh(&mp->rcu, br_multicast_free_group); 241 242 out: 243 spin_unlock(&br->multicast_lock); 244 } 245 246 static void br_multicast_del_pg(struct net_bridge *br, 247 struct net_bridge_port_group *pg) 248 { 249 struct net_bridge_mdb_htable *mdb; 250 struct net_bridge_mdb_entry *mp; 251 struct net_bridge_port_group *p; 252 struct net_bridge_port_group __rcu **pp; 253 254 mdb = mlock_dereference(br->mdb, br); 255 256 mp = br_mdb_ip_get(mdb, &pg->addr); 257 if (WARN_ON(!mp)) 258 return; 259 260 for (pp = &mp->ports; 261 (p = mlock_dereference(*pp, br)) != NULL; 262 pp = &p->next) { 263 if (p != pg) 264 continue; 265 266 rcu_assign_pointer(*pp, p->next); 267 hlist_del_init(&p->mglist); 268 del_timer(&p->timer); 269 call_rcu_bh(&p->rcu, br_multicast_free_pg); 270 271 if (!mp->ports && !mp->mglist && 272 netif_running(br->dev)) 273 mod_timer(&mp->timer, jiffies); 274 275 return; 276 } 277 278 WARN_ON(1); 279 } 280 281 static void br_multicast_port_group_expired(unsigned long data) 282 { 283 struct net_bridge_port_group *pg = (void *)data; 284 struct net_bridge *br = pg->port->br; 285 286 spin_lock(&br->multicast_lock); 287 if (!netif_running(br->dev) || timer_pending(&pg->timer) || 288 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT) 289 goto out; 290 291 br_multicast_del_pg(br, pg); 292 293 out: 294 spin_unlock(&br->multicast_lock); 295 } 296 297 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, 298 int elasticity) 299 { 300 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); 301 struct net_bridge_mdb_htable *mdb; 302 int err; 303 304 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); 305 if (!mdb) 306 return -ENOMEM; 307 308 mdb->max = max; 309 mdb->old = old; 310 311 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); 312 if (!mdb->mhash) { 313 kfree(mdb); 314 return -ENOMEM; 315 } 316 317 mdb->size = old ? old->size : 0; 318 mdb->ver = old ? old->ver ^ 1 : 0; 319 320 if (!old || elasticity) 321 get_random_bytes(&mdb->secret, sizeof(mdb->secret)); 322 else 323 mdb->secret = old->secret; 324 325 if (!old) 326 goto out; 327 328 err = br_mdb_copy(mdb, old, elasticity); 329 if (err) { 330 kfree(mdb->mhash); 331 kfree(mdb); 332 return err; 333 } 334 335 br_mdb_rehash_seq++; 336 call_rcu_bh(&mdb->rcu, br_mdb_free); 337 338 out: 339 rcu_assign_pointer(*mdbp, mdb); 340 341 return 0; 342 } 343 344 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, 345 __be32 group) 346 { 347 struct sk_buff *skb; 348 struct igmphdr *ih; 349 struct ethhdr *eth; 350 struct iphdr *iph; 351 352 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + 353 sizeof(*ih) + 4); 354 if (!skb) 355 goto out; 356 357 skb->protocol = htons(ETH_P_IP); 358 359 skb_reset_mac_header(skb); 360 eth = eth_hdr(skb); 361 362 memcpy(eth->h_source, br->dev->dev_addr, 6); 363 eth->h_dest[0] = 1; 364 eth->h_dest[1] = 0; 365 eth->h_dest[2] = 0x5e; 366 eth->h_dest[3] = 0; 367 eth->h_dest[4] = 0; 368 eth->h_dest[5] = 1; 369 eth->h_proto = htons(ETH_P_IP); 370 skb_put(skb, sizeof(*eth)); 371 372 skb_set_network_header(skb, skb->len); 373 iph = ip_hdr(skb); 374 375 iph->version = 4; 376 iph->ihl = 6; 377 iph->tos = 0xc0; 378 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4); 379 iph->id = 0; 380 iph->frag_off = htons(IP_DF); 381 iph->ttl = 1; 382 iph->protocol = IPPROTO_IGMP; 383 iph->saddr = 0; 384 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); 385 ((u8 *)&iph[1])[0] = IPOPT_RA; 386 ((u8 *)&iph[1])[1] = 4; 387 ((u8 *)&iph[1])[2] = 0; 388 ((u8 *)&iph[1])[3] = 0; 389 ip_send_check(iph); 390 skb_put(skb, 24); 391 392 skb_set_transport_header(skb, skb->len); 393 ih = igmp_hdr(skb); 394 ih->type = IGMP_HOST_MEMBERSHIP_QUERY; 395 ih->code = (group ? br->multicast_last_member_interval : 396 br->multicast_query_response_interval) / 397 (HZ / IGMP_TIMER_SCALE); 398 ih->group = group; 399 ih->csum = 0; 400 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 401 skb_put(skb, sizeof(*ih)); 402 403 __skb_pull(skb, sizeof(*eth)); 404 405 out: 406 return skb; 407 } 408 409 #if IS_ENABLED(CONFIG_IPV6) 410 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, 411 const struct in6_addr *group) 412 { 413 struct sk_buff *skb; 414 struct ipv6hdr *ip6h; 415 struct mld_msg *mldq; 416 struct ethhdr *eth; 417 u8 *hopopt; 418 unsigned long interval; 419 420 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + 421 8 + sizeof(*mldq)); 422 if (!skb) 423 goto out; 424 425 skb->protocol = htons(ETH_P_IPV6); 426 427 /* Ethernet header */ 428 skb_reset_mac_header(skb); 429 eth = eth_hdr(skb); 430 431 memcpy(eth->h_source, br->dev->dev_addr, 6); 432 eth->h_proto = htons(ETH_P_IPV6); 433 skb_put(skb, sizeof(*eth)); 434 435 /* IPv6 header + HbH option */ 436 skb_set_network_header(skb, skb->len); 437 ip6h = ipv6_hdr(skb); 438 439 *(__force __be32 *)ip6h = htonl(0x60000000); 440 ip6h->payload_len = htons(8 + sizeof(*mldq)); 441 ip6h->nexthdr = IPPROTO_HOPOPTS; 442 ip6h->hop_limit = 1; 443 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); 444 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, 445 &ip6h->saddr)) { 446 kfree_skb(skb); 447 return NULL; 448 } 449 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 450 451 hopopt = (u8 *)(ip6h + 1); 452 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ 453 hopopt[1] = 0; /* length of HbH */ 454 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ 455 hopopt[3] = 2; /* Length of RA Option */ 456 hopopt[4] = 0; /* Type = 0x0000 (MLD) */ 457 hopopt[5] = 0; 458 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ 459 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ 460 461 skb_put(skb, sizeof(*ip6h) + 8); 462 463 /* ICMPv6 */ 464 skb_set_transport_header(skb, skb->len); 465 mldq = (struct mld_msg *) icmp6_hdr(skb); 466 467 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval : 468 br->multicast_query_response_interval; 469 470 mldq->mld_type = ICMPV6_MGM_QUERY; 471 mldq->mld_code = 0; 472 mldq->mld_cksum = 0; 473 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); 474 mldq->mld_reserved = 0; 475 mldq->mld_mca = *group; 476 477 /* checksum */ 478 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 479 sizeof(*mldq), IPPROTO_ICMPV6, 480 csum_partial(mldq, 481 sizeof(*mldq), 0)); 482 skb_put(skb, sizeof(*mldq)); 483 484 __skb_pull(skb, sizeof(*eth)); 485 486 out: 487 return skb; 488 } 489 #endif 490 491 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, 492 struct br_ip *addr) 493 { 494 switch (addr->proto) { 495 case htons(ETH_P_IP): 496 return br_ip4_multicast_alloc_query(br, addr->u.ip4); 497 #if IS_ENABLED(CONFIG_IPV6) 498 case htons(ETH_P_IPV6): 499 return br_ip6_multicast_alloc_query(br, &addr->u.ip6); 500 #endif 501 } 502 return NULL; 503 } 504 505 static struct net_bridge_mdb_entry *br_multicast_get_group( 506 struct net_bridge *br, struct net_bridge_port *port, 507 struct br_ip *group, int hash) 508 { 509 struct net_bridge_mdb_htable *mdb; 510 struct net_bridge_mdb_entry *mp; 511 unsigned int count = 0; 512 unsigned int max; 513 int elasticity; 514 int err; 515 516 mdb = rcu_dereference_protected(br->mdb, 1); 517 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) { 518 count++; 519 if (unlikely(br_ip_equal(group, &mp->addr))) 520 return mp; 521 } 522 523 elasticity = 0; 524 max = mdb->max; 525 526 if (unlikely(count > br->hash_elasticity && count)) { 527 if (net_ratelimit()) 528 br_info(br, "Multicast hash table " 529 "chain limit reached: %s\n", 530 port ? port->dev->name : br->dev->name); 531 532 elasticity = br->hash_elasticity; 533 } 534 535 if (mdb->size >= max) { 536 max *= 2; 537 if (unlikely(max > br->hash_max)) { 538 br_warn(br, "Multicast hash table maximum of %d " 539 "reached, disabling snooping: %s\n", 540 br->hash_max, 541 port ? port->dev->name : br->dev->name); 542 err = -E2BIG; 543 disable: 544 br->multicast_disabled = 1; 545 goto err; 546 } 547 } 548 549 if (max > mdb->max || elasticity) { 550 if (mdb->old) { 551 if (net_ratelimit()) 552 br_info(br, "Multicast hash table " 553 "on fire: %s\n", 554 port ? port->dev->name : br->dev->name); 555 err = -EEXIST; 556 goto err; 557 } 558 559 err = br_mdb_rehash(&br->mdb, max, elasticity); 560 if (err) { 561 br_warn(br, "Cannot rehash multicast " 562 "hash table, disabling snooping: %s, %d, %d\n", 563 port ? port->dev->name : br->dev->name, 564 mdb->size, err); 565 goto disable; 566 } 567 568 err = -EAGAIN; 569 goto err; 570 } 571 572 return NULL; 573 574 err: 575 mp = ERR_PTR(err); 576 return mp; 577 } 578 579 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, 580 struct net_bridge_port *port, struct br_ip *group) 581 { 582 struct net_bridge_mdb_htable *mdb; 583 struct net_bridge_mdb_entry *mp; 584 int hash; 585 int err; 586 587 mdb = rcu_dereference_protected(br->mdb, 1); 588 if (!mdb) { 589 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); 590 if (err) 591 return ERR_PTR(err); 592 goto rehash; 593 } 594 595 hash = br_ip_hash(mdb, group); 596 mp = br_multicast_get_group(br, port, group, hash); 597 switch (PTR_ERR(mp)) { 598 case 0: 599 break; 600 601 case -EAGAIN: 602 rehash: 603 mdb = rcu_dereference_protected(br->mdb, 1); 604 hash = br_ip_hash(mdb, group); 605 break; 606 607 default: 608 goto out; 609 } 610 611 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 612 if (unlikely(!mp)) 613 return ERR_PTR(-ENOMEM); 614 615 mp->br = br; 616 mp->addr = *group; 617 setup_timer(&mp->timer, br_multicast_group_expired, 618 (unsigned long)mp); 619 620 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); 621 mdb->size++; 622 623 out: 624 return mp; 625 } 626 627 struct net_bridge_port_group *br_multicast_new_port_group( 628 struct net_bridge_port *port, 629 struct br_ip *group, 630 struct net_bridge_port_group __rcu *next, 631 unsigned char state) 632 { 633 struct net_bridge_port_group *p; 634 635 p = kzalloc(sizeof(*p), GFP_ATOMIC); 636 if (unlikely(!p)) 637 return NULL; 638 639 p->addr = *group; 640 p->port = port; 641 p->state = state; 642 rcu_assign_pointer(p->next, next); 643 hlist_add_head(&p->mglist, &port->mglist); 644 setup_timer(&p->timer, br_multicast_port_group_expired, 645 (unsigned long)p); 646 return p; 647 } 648 649 static int br_multicast_add_group(struct net_bridge *br, 650 struct net_bridge_port *port, 651 struct br_ip *group) 652 { 653 struct net_bridge_mdb_entry *mp; 654 struct net_bridge_port_group *p; 655 struct net_bridge_port_group __rcu **pp; 656 unsigned long now = jiffies; 657 int err; 658 659 spin_lock(&br->multicast_lock); 660 if (!netif_running(br->dev) || 661 (port && port->state == BR_STATE_DISABLED)) 662 goto out; 663 664 mp = br_multicast_new_group(br, port, group); 665 err = PTR_ERR(mp); 666 if (IS_ERR(mp)) 667 goto err; 668 669 if (!port) { 670 mp->mglist = true; 671 mod_timer(&mp->timer, now + br->multicast_membership_interval); 672 goto out; 673 } 674 675 for (pp = &mp->ports; 676 (p = mlock_dereference(*pp, br)) != NULL; 677 pp = &p->next) { 678 if (p->port == port) 679 goto found; 680 if ((unsigned long)p->port < (unsigned long)port) 681 break; 682 } 683 684 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY); 685 if (unlikely(!p)) 686 goto err; 687 rcu_assign_pointer(*pp, p); 688 br_mdb_notify(br->dev, port, group, RTM_NEWMDB); 689 690 found: 691 mod_timer(&p->timer, now + br->multicast_membership_interval); 692 out: 693 err = 0; 694 695 err: 696 spin_unlock(&br->multicast_lock); 697 return err; 698 } 699 700 static int br_ip4_multicast_add_group(struct net_bridge *br, 701 struct net_bridge_port *port, 702 __be32 group, 703 __u16 vid) 704 { 705 struct br_ip br_group; 706 707 if (ipv4_is_local_multicast(group)) 708 return 0; 709 710 br_group.u.ip4 = group; 711 br_group.proto = htons(ETH_P_IP); 712 br_group.vid = vid; 713 714 return br_multicast_add_group(br, port, &br_group); 715 } 716 717 #if IS_ENABLED(CONFIG_IPV6) 718 static int br_ip6_multicast_add_group(struct net_bridge *br, 719 struct net_bridge_port *port, 720 const struct in6_addr *group, 721 __u16 vid) 722 { 723 struct br_ip br_group; 724 725 if (!ipv6_is_transient_multicast(group)) 726 return 0; 727 728 br_group.u.ip6 = *group; 729 br_group.proto = htons(ETH_P_IPV6); 730 br_group.vid = vid; 731 732 return br_multicast_add_group(br, port, &br_group); 733 } 734 #endif 735 736 static void br_multicast_router_expired(unsigned long data) 737 { 738 struct net_bridge_port *port = (void *)data; 739 struct net_bridge *br = port->br; 740 741 spin_lock(&br->multicast_lock); 742 if (port->multicast_router != 1 || 743 timer_pending(&port->multicast_router_timer) || 744 hlist_unhashed(&port->rlist)) 745 goto out; 746 747 hlist_del_init_rcu(&port->rlist); 748 749 out: 750 spin_unlock(&br->multicast_lock); 751 } 752 753 static void br_multicast_local_router_expired(unsigned long data) 754 { 755 } 756 757 static void br_multicast_querier_expired(unsigned long data) 758 { 759 struct net_bridge *br = (void *)data; 760 761 spin_lock(&br->multicast_lock); 762 if (!netif_running(br->dev) || br->multicast_disabled) 763 goto out; 764 765 br_multicast_start_querier(br); 766 767 out: 768 spin_unlock(&br->multicast_lock); 769 } 770 771 static void __br_multicast_send_query(struct net_bridge *br, 772 struct net_bridge_port *port, 773 struct br_ip *ip) 774 { 775 struct sk_buff *skb; 776 777 skb = br_multicast_alloc_query(br, ip); 778 if (!skb) 779 return; 780 781 if (port) { 782 __skb_push(skb, sizeof(struct ethhdr)); 783 skb->dev = port->dev; 784 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, 785 dev_queue_xmit); 786 } else 787 netif_rx(skb); 788 } 789 790 static void br_multicast_send_query(struct net_bridge *br, 791 struct net_bridge_port *port, u32 sent) 792 { 793 unsigned long time; 794 struct br_ip br_group; 795 796 if (!netif_running(br->dev) || br->multicast_disabled || 797 !br->multicast_querier || 798 timer_pending(&br->multicast_querier_timer)) 799 return; 800 801 memset(&br_group.u, 0, sizeof(br_group.u)); 802 803 br_group.proto = htons(ETH_P_IP); 804 __br_multicast_send_query(br, port, &br_group); 805 806 #if IS_ENABLED(CONFIG_IPV6) 807 br_group.proto = htons(ETH_P_IPV6); 808 __br_multicast_send_query(br, port, &br_group); 809 #endif 810 811 time = jiffies; 812 time += sent < br->multicast_startup_query_count ? 813 br->multicast_startup_query_interval : 814 br->multicast_query_interval; 815 mod_timer(port ? &port->multicast_query_timer : 816 &br->multicast_query_timer, time); 817 } 818 819 static void br_multicast_port_query_expired(unsigned long data) 820 { 821 struct net_bridge_port *port = (void *)data; 822 struct net_bridge *br = port->br; 823 824 spin_lock(&br->multicast_lock); 825 if (port->state == BR_STATE_DISABLED || 826 port->state == BR_STATE_BLOCKING) 827 goto out; 828 829 if (port->multicast_startup_queries_sent < 830 br->multicast_startup_query_count) 831 port->multicast_startup_queries_sent++; 832 833 br_multicast_send_query(port->br, port, 834 port->multicast_startup_queries_sent); 835 836 out: 837 spin_unlock(&br->multicast_lock); 838 } 839 840 void br_multicast_add_port(struct net_bridge_port *port) 841 { 842 port->multicast_router = 1; 843 844 setup_timer(&port->multicast_router_timer, br_multicast_router_expired, 845 (unsigned long)port); 846 setup_timer(&port->multicast_query_timer, 847 br_multicast_port_query_expired, (unsigned long)port); 848 } 849 850 void br_multicast_del_port(struct net_bridge_port *port) 851 { 852 del_timer_sync(&port->multicast_router_timer); 853 } 854 855 static void __br_multicast_enable_port(struct net_bridge_port *port) 856 { 857 port->multicast_startup_queries_sent = 0; 858 859 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || 860 del_timer(&port->multicast_query_timer)) 861 mod_timer(&port->multicast_query_timer, jiffies); 862 } 863 864 void br_multicast_enable_port(struct net_bridge_port *port) 865 { 866 struct net_bridge *br = port->br; 867 868 spin_lock(&br->multicast_lock); 869 if (br->multicast_disabled || !netif_running(br->dev)) 870 goto out; 871 872 __br_multicast_enable_port(port); 873 874 out: 875 spin_unlock(&br->multicast_lock); 876 } 877 878 void br_multicast_disable_port(struct net_bridge_port *port) 879 { 880 struct net_bridge *br = port->br; 881 struct net_bridge_port_group *pg; 882 struct hlist_node *n; 883 884 spin_lock(&br->multicast_lock); 885 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 886 br_multicast_del_pg(br, pg); 887 888 if (!hlist_unhashed(&port->rlist)) 889 hlist_del_init_rcu(&port->rlist); 890 del_timer(&port->multicast_router_timer); 891 del_timer(&port->multicast_query_timer); 892 spin_unlock(&br->multicast_lock); 893 } 894 895 static int br_ip4_multicast_igmp3_report(struct net_bridge *br, 896 struct net_bridge_port *port, 897 struct sk_buff *skb) 898 { 899 struct igmpv3_report *ih; 900 struct igmpv3_grec *grec; 901 int i; 902 int len; 903 int num; 904 int type; 905 int err = 0; 906 __be32 group; 907 u16 vid = 0; 908 909 if (!pskb_may_pull(skb, sizeof(*ih))) 910 return -EINVAL; 911 912 br_vlan_get_tag(skb, &vid); 913 ih = igmpv3_report_hdr(skb); 914 num = ntohs(ih->ngrec); 915 len = sizeof(*ih); 916 917 for (i = 0; i < num; i++) { 918 len += sizeof(*grec); 919 if (!pskb_may_pull(skb, len)) 920 return -EINVAL; 921 922 grec = (void *)(skb->data + len - sizeof(*grec)); 923 group = grec->grec_mca; 924 type = grec->grec_type; 925 926 len += ntohs(grec->grec_nsrcs) * 4; 927 if (!pskb_may_pull(skb, len)) 928 return -EINVAL; 929 930 /* We treat this as an IGMPv2 report for now. */ 931 switch (type) { 932 case IGMPV3_MODE_IS_INCLUDE: 933 case IGMPV3_MODE_IS_EXCLUDE: 934 case IGMPV3_CHANGE_TO_INCLUDE: 935 case IGMPV3_CHANGE_TO_EXCLUDE: 936 case IGMPV3_ALLOW_NEW_SOURCES: 937 case IGMPV3_BLOCK_OLD_SOURCES: 938 break; 939 940 default: 941 continue; 942 } 943 944 err = br_ip4_multicast_add_group(br, port, group, vid); 945 if (err) 946 break; 947 } 948 949 return err; 950 } 951 952 #if IS_ENABLED(CONFIG_IPV6) 953 static int br_ip6_multicast_mld2_report(struct net_bridge *br, 954 struct net_bridge_port *port, 955 struct sk_buff *skb) 956 { 957 struct icmp6hdr *icmp6h; 958 struct mld2_grec *grec; 959 int i; 960 int len; 961 int num; 962 int err = 0; 963 u16 vid = 0; 964 965 if (!pskb_may_pull(skb, sizeof(*icmp6h))) 966 return -EINVAL; 967 968 br_vlan_get_tag(skb, &vid); 969 icmp6h = icmp6_hdr(skb); 970 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 971 len = sizeof(*icmp6h); 972 973 for (i = 0; i < num; i++) { 974 __be16 *nsrcs, _nsrcs; 975 976 nsrcs = skb_header_pointer(skb, 977 len + offsetof(struct mld2_grec, 978 grec_nsrcs), 979 sizeof(_nsrcs), &_nsrcs); 980 if (!nsrcs) 981 return -EINVAL; 982 983 if (!pskb_may_pull(skb, 984 len + sizeof(*grec) + 985 sizeof(struct in6_addr) * ntohs(*nsrcs))) 986 return -EINVAL; 987 988 grec = (struct mld2_grec *)(skb->data + len); 989 len += sizeof(*grec) + 990 sizeof(struct in6_addr) * ntohs(*nsrcs); 991 992 /* We treat these as MLDv1 reports for now. */ 993 switch (grec->grec_type) { 994 case MLD2_MODE_IS_INCLUDE: 995 case MLD2_MODE_IS_EXCLUDE: 996 case MLD2_CHANGE_TO_INCLUDE: 997 case MLD2_CHANGE_TO_EXCLUDE: 998 case MLD2_ALLOW_NEW_SOURCES: 999 case MLD2_BLOCK_OLD_SOURCES: 1000 break; 1001 1002 default: 1003 continue; 1004 } 1005 1006 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca, 1007 vid); 1008 if (!err) 1009 break; 1010 } 1011 1012 return err; 1013 } 1014 #endif 1015 1016 /* 1017 * Add port to rotuer_list 1018 * list is maintained ordered by pointer value 1019 * and locked by br->multicast_lock and RCU 1020 */ 1021 static void br_multicast_add_router(struct net_bridge *br, 1022 struct net_bridge_port *port) 1023 { 1024 struct net_bridge_port *p; 1025 struct hlist_node *slot = NULL; 1026 1027 hlist_for_each_entry(p, &br->router_list, rlist) { 1028 if ((unsigned long) port >= (unsigned long) p) 1029 break; 1030 slot = &p->rlist; 1031 } 1032 1033 if (slot) 1034 hlist_add_after_rcu(slot, &port->rlist); 1035 else 1036 hlist_add_head_rcu(&port->rlist, &br->router_list); 1037 } 1038 1039 static void br_multicast_mark_router(struct net_bridge *br, 1040 struct net_bridge_port *port) 1041 { 1042 unsigned long now = jiffies; 1043 1044 if (!port) { 1045 if (br->multicast_router == 1) 1046 mod_timer(&br->multicast_router_timer, 1047 now + br->multicast_querier_interval); 1048 return; 1049 } 1050 1051 if (port->multicast_router != 1) 1052 return; 1053 1054 if (!hlist_unhashed(&port->rlist)) 1055 goto timer; 1056 1057 br_multicast_add_router(br, port); 1058 1059 timer: 1060 mod_timer(&port->multicast_router_timer, 1061 now + br->multicast_querier_interval); 1062 } 1063 1064 static void br_multicast_query_received(struct net_bridge *br, 1065 struct net_bridge_port *port, 1066 int saddr) 1067 { 1068 if (saddr) 1069 mod_timer(&br->multicast_querier_timer, 1070 jiffies + br->multicast_querier_interval); 1071 else if (timer_pending(&br->multicast_querier_timer)) 1072 return; 1073 1074 br_multicast_mark_router(br, port); 1075 } 1076 1077 static int br_ip4_multicast_query(struct net_bridge *br, 1078 struct net_bridge_port *port, 1079 struct sk_buff *skb) 1080 { 1081 const struct iphdr *iph = ip_hdr(skb); 1082 struct igmphdr *ih = igmp_hdr(skb); 1083 struct net_bridge_mdb_entry *mp; 1084 struct igmpv3_query *ih3; 1085 struct net_bridge_port_group *p; 1086 struct net_bridge_port_group __rcu **pp; 1087 unsigned long max_delay; 1088 unsigned long now = jiffies; 1089 __be32 group; 1090 int err = 0; 1091 u16 vid = 0; 1092 1093 spin_lock(&br->multicast_lock); 1094 if (!netif_running(br->dev) || 1095 (port && port->state == BR_STATE_DISABLED)) 1096 goto out; 1097 1098 br_multicast_query_received(br, port, !!iph->saddr); 1099 1100 group = ih->group; 1101 1102 if (skb->len == sizeof(*ih)) { 1103 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 1104 1105 if (!max_delay) { 1106 max_delay = 10 * HZ; 1107 group = 0; 1108 } 1109 } else { 1110 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) { 1111 err = -EINVAL; 1112 goto out; 1113 } 1114 1115 ih3 = igmpv3_query_hdr(skb); 1116 if (ih3->nsrcs) 1117 goto out; 1118 1119 max_delay = ih3->code ? 1120 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 1121 } 1122 1123 if (!group) 1124 goto out; 1125 1126 br_vlan_get_tag(skb, &vid); 1127 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid); 1128 if (!mp) 1129 goto out; 1130 1131 max_delay *= br->multicast_last_member_count; 1132 1133 if (mp->mglist && 1134 (timer_pending(&mp->timer) ? 1135 time_after(mp->timer.expires, now + max_delay) : 1136 try_to_del_timer_sync(&mp->timer) >= 0)) 1137 mod_timer(&mp->timer, now + max_delay); 1138 1139 for (pp = &mp->ports; 1140 (p = mlock_dereference(*pp, br)) != NULL; 1141 pp = &p->next) { 1142 if (timer_pending(&p->timer) ? 1143 time_after(p->timer.expires, now + max_delay) : 1144 try_to_del_timer_sync(&p->timer) >= 0) 1145 mod_timer(&p->timer, now + max_delay); 1146 } 1147 1148 out: 1149 spin_unlock(&br->multicast_lock); 1150 return err; 1151 } 1152 1153 #if IS_ENABLED(CONFIG_IPV6) 1154 static int br_ip6_multicast_query(struct net_bridge *br, 1155 struct net_bridge_port *port, 1156 struct sk_buff *skb) 1157 { 1158 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 1159 struct mld_msg *mld; 1160 struct net_bridge_mdb_entry *mp; 1161 struct mld2_query *mld2q; 1162 struct net_bridge_port_group *p; 1163 struct net_bridge_port_group __rcu **pp; 1164 unsigned long max_delay; 1165 unsigned long now = jiffies; 1166 const struct in6_addr *group = NULL; 1167 int err = 0; 1168 u16 vid = 0; 1169 1170 spin_lock(&br->multicast_lock); 1171 if (!netif_running(br->dev) || 1172 (port && port->state == BR_STATE_DISABLED)) 1173 goto out; 1174 1175 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr)); 1176 1177 if (skb->len == sizeof(*mld)) { 1178 if (!pskb_may_pull(skb, sizeof(*mld))) { 1179 err = -EINVAL; 1180 goto out; 1181 } 1182 mld = (struct mld_msg *) icmp6_hdr(skb); 1183 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); 1184 if (max_delay) 1185 group = &mld->mld_mca; 1186 } else if (skb->len >= sizeof(*mld2q)) { 1187 if (!pskb_may_pull(skb, sizeof(*mld2q))) { 1188 err = -EINVAL; 1189 goto out; 1190 } 1191 mld2q = (struct mld2_query *)icmp6_hdr(skb); 1192 if (!mld2q->mld2q_nsrcs) 1193 group = &mld2q->mld2q_mca; 1194 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(ntohs(mld2q->mld2q_mrc)) : 1; 1195 } 1196 1197 if (!group) 1198 goto out; 1199 1200 br_vlan_get_tag(skb, &vid); 1201 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid); 1202 if (!mp) 1203 goto out; 1204 1205 max_delay *= br->multicast_last_member_count; 1206 if (mp->mglist && 1207 (timer_pending(&mp->timer) ? 1208 time_after(mp->timer.expires, now + max_delay) : 1209 try_to_del_timer_sync(&mp->timer) >= 0)) 1210 mod_timer(&mp->timer, now + max_delay); 1211 1212 for (pp = &mp->ports; 1213 (p = mlock_dereference(*pp, br)) != NULL; 1214 pp = &p->next) { 1215 if (timer_pending(&p->timer) ? 1216 time_after(p->timer.expires, now + max_delay) : 1217 try_to_del_timer_sync(&p->timer) >= 0) 1218 mod_timer(&p->timer, now + max_delay); 1219 } 1220 1221 out: 1222 spin_unlock(&br->multicast_lock); 1223 return err; 1224 } 1225 #endif 1226 1227 static void br_multicast_leave_group(struct net_bridge *br, 1228 struct net_bridge_port *port, 1229 struct br_ip *group) 1230 { 1231 struct net_bridge_mdb_htable *mdb; 1232 struct net_bridge_mdb_entry *mp; 1233 struct net_bridge_port_group *p; 1234 unsigned long now; 1235 unsigned long time; 1236 1237 spin_lock(&br->multicast_lock); 1238 if (!netif_running(br->dev) || 1239 (port && port->state == BR_STATE_DISABLED) || 1240 timer_pending(&br->multicast_querier_timer)) 1241 goto out; 1242 1243 mdb = mlock_dereference(br->mdb, br); 1244 mp = br_mdb_ip_get(mdb, group); 1245 if (!mp) 1246 goto out; 1247 1248 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { 1249 struct net_bridge_port_group __rcu **pp; 1250 1251 for (pp = &mp->ports; 1252 (p = mlock_dereference(*pp, br)) != NULL; 1253 pp = &p->next) { 1254 if (p->port != port) 1255 continue; 1256 1257 rcu_assign_pointer(*pp, p->next); 1258 hlist_del_init(&p->mglist); 1259 del_timer(&p->timer); 1260 call_rcu_bh(&p->rcu, br_multicast_free_pg); 1261 br_mdb_notify(br->dev, port, group, RTM_DELMDB); 1262 1263 if (!mp->ports && !mp->mglist && 1264 netif_running(br->dev)) 1265 mod_timer(&mp->timer, jiffies); 1266 } 1267 goto out; 1268 } 1269 1270 now = jiffies; 1271 time = now + br->multicast_last_member_count * 1272 br->multicast_last_member_interval; 1273 1274 if (!port) { 1275 if (mp->mglist && 1276 (timer_pending(&mp->timer) ? 1277 time_after(mp->timer.expires, time) : 1278 try_to_del_timer_sync(&mp->timer) >= 0)) { 1279 mod_timer(&mp->timer, time); 1280 } 1281 1282 goto out; 1283 } 1284 1285 for (p = mlock_dereference(mp->ports, br); 1286 p != NULL; 1287 p = mlock_dereference(p->next, br)) { 1288 if (p->port != port) 1289 continue; 1290 1291 if (!hlist_unhashed(&p->mglist) && 1292 (timer_pending(&p->timer) ? 1293 time_after(p->timer.expires, time) : 1294 try_to_del_timer_sync(&p->timer) >= 0)) { 1295 mod_timer(&p->timer, time); 1296 } 1297 1298 break; 1299 } 1300 1301 out: 1302 spin_unlock(&br->multicast_lock); 1303 } 1304 1305 static void br_ip4_multicast_leave_group(struct net_bridge *br, 1306 struct net_bridge_port *port, 1307 __be32 group, 1308 __u16 vid) 1309 { 1310 struct br_ip br_group; 1311 1312 if (ipv4_is_local_multicast(group)) 1313 return; 1314 1315 br_group.u.ip4 = group; 1316 br_group.proto = htons(ETH_P_IP); 1317 br_group.vid = vid; 1318 1319 br_multicast_leave_group(br, port, &br_group); 1320 } 1321 1322 #if IS_ENABLED(CONFIG_IPV6) 1323 static void br_ip6_multicast_leave_group(struct net_bridge *br, 1324 struct net_bridge_port *port, 1325 const struct in6_addr *group, 1326 __u16 vid) 1327 { 1328 struct br_ip br_group; 1329 1330 if (!ipv6_is_transient_multicast(group)) 1331 return; 1332 1333 br_group.u.ip6 = *group; 1334 br_group.proto = htons(ETH_P_IPV6); 1335 br_group.vid = vid; 1336 1337 br_multicast_leave_group(br, port, &br_group); 1338 } 1339 #endif 1340 1341 static int br_multicast_ipv4_rcv(struct net_bridge *br, 1342 struct net_bridge_port *port, 1343 struct sk_buff *skb) 1344 { 1345 struct sk_buff *skb2 = skb; 1346 const struct iphdr *iph; 1347 struct igmphdr *ih; 1348 unsigned int len; 1349 unsigned int offset; 1350 int err; 1351 u16 vid = 0; 1352 1353 /* We treat OOM as packet loss for now. */ 1354 if (!pskb_may_pull(skb, sizeof(*iph))) 1355 return -EINVAL; 1356 1357 iph = ip_hdr(skb); 1358 1359 if (iph->ihl < 5 || iph->version != 4) 1360 return -EINVAL; 1361 1362 if (!pskb_may_pull(skb, ip_hdrlen(skb))) 1363 return -EINVAL; 1364 1365 iph = ip_hdr(skb); 1366 1367 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1368 return -EINVAL; 1369 1370 if (iph->protocol != IPPROTO_IGMP) { 1371 if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP) 1372 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1373 return 0; 1374 } 1375 1376 len = ntohs(iph->tot_len); 1377 if (skb->len < len || len < ip_hdrlen(skb)) 1378 return -EINVAL; 1379 1380 if (skb->len > len) { 1381 skb2 = skb_clone(skb, GFP_ATOMIC); 1382 if (!skb2) 1383 return -ENOMEM; 1384 1385 err = pskb_trim_rcsum(skb2, len); 1386 if (err) 1387 goto err_out; 1388 } 1389 1390 len -= ip_hdrlen(skb2); 1391 offset = skb_network_offset(skb2) + ip_hdrlen(skb2); 1392 __skb_pull(skb2, offset); 1393 skb_reset_transport_header(skb2); 1394 1395 err = -EINVAL; 1396 if (!pskb_may_pull(skb2, sizeof(*ih))) 1397 goto out; 1398 1399 switch (skb2->ip_summed) { 1400 case CHECKSUM_COMPLETE: 1401 if (!csum_fold(skb2->csum)) 1402 break; 1403 /* fall through */ 1404 case CHECKSUM_NONE: 1405 skb2->csum = 0; 1406 if (skb_checksum_complete(skb2)) 1407 goto out; 1408 } 1409 1410 err = 0; 1411 1412 br_vlan_get_tag(skb2, &vid); 1413 BR_INPUT_SKB_CB(skb)->igmp = 1; 1414 ih = igmp_hdr(skb2); 1415 1416 switch (ih->type) { 1417 case IGMP_HOST_MEMBERSHIP_REPORT: 1418 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1419 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1420 err = br_ip4_multicast_add_group(br, port, ih->group, vid); 1421 break; 1422 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1423 err = br_ip4_multicast_igmp3_report(br, port, skb2); 1424 break; 1425 case IGMP_HOST_MEMBERSHIP_QUERY: 1426 err = br_ip4_multicast_query(br, port, skb2); 1427 break; 1428 case IGMP_HOST_LEAVE_MESSAGE: 1429 br_ip4_multicast_leave_group(br, port, ih->group, vid); 1430 break; 1431 } 1432 1433 out: 1434 __skb_push(skb2, offset); 1435 err_out: 1436 if (skb2 != skb) 1437 kfree_skb(skb2); 1438 return err; 1439 } 1440 1441 #if IS_ENABLED(CONFIG_IPV6) 1442 static int br_multicast_ipv6_rcv(struct net_bridge *br, 1443 struct net_bridge_port *port, 1444 struct sk_buff *skb) 1445 { 1446 struct sk_buff *skb2; 1447 const struct ipv6hdr *ip6h; 1448 u8 icmp6_type; 1449 u8 nexthdr; 1450 __be16 frag_off; 1451 unsigned int len; 1452 int offset; 1453 int err; 1454 u16 vid = 0; 1455 1456 if (!pskb_may_pull(skb, sizeof(*ip6h))) 1457 return -EINVAL; 1458 1459 ip6h = ipv6_hdr(skb); 1460 1461 /* 1462 * We're interested in MLD messages only. 1463 * - Version is 6 1464 * - MLD has always Router Alert hop-by-hop option 1465 * - But we do not support jumbrograms. 1466 */ 1467 if (ip6h->version != 6 || 1468 ip6h->nexthdr != IPPROTO_HOPOPTS || 1469 ip6h->payload_len == 0) 1470 return 0; 1471 1472 len = ntohs(ip6h->payload_len) + sizeof(*ip6h); 1473 if (skb->len < len) 1474 return -EINVAL; 1475 1476 nexthdr = ip6h->nexthdr; 1477 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off); 1478 1479 if (offset < 0 || nexthdr != IPPROTO_ICMPV6) 1480 return 0; 1481 1482 /* Okay, we found ICMPv6 header */ 1483 skb2 = skb_clone(skb, GFP_ATOMIC); 1484 if (!skb2) 1485 return -ENOMEM; 1486 1487 err = -EINVAL; 1488 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr))) 1489 goto out; 1490 1491 len -= offset - skb_network_offset(skb2); 1492 1493 __skb_pull(skb2, offset); 1494 skb_reset_transport_header(skb2); 1495 skb_postpull_rcsum(skb2, skb_network_header(skb2), 1496 skb_network_header_len(skb2)); 1497 1498 icmp6_type = icmp6_hdr(skb2)->icmp6_type; 1499 1500 switch (icmp6_type) { 1501 case ICMPV6_MGM_QUERY: 1502 case ICMPV6_MGM_REPORT: 1503 case ICMPV6_MGM_REDUCTION: 1504 case ICMPV6_MLD2_REPORT: 1505 break; 1506 default: 1507 err = 0; 1508 goto out; 1509 } 1510 1511 /* Okay, we found MLD message. Check further. */ 1512 if (skb2->len > len) { 1513 err = pskb_trim_rcsum(skb2, len); 1514 if (err) 1515 goto out; 1516 err = -EINVAL; 1517 } 1518 1519 ip6h = ipv6_hdr(skb2); 1520 1521 switch (skb2->ip_summed) { 1522 case CHECKSUM_COMPLETE: 1523 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len, 1524 IPPROTO_ICMPV6, skb2->csum)) 1525 break; 1526 /*FALLTHROUGH*/ 1527 case CHECKSUM_NONE: 1528 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, 1529 &ip6h->daddr, 1530 skb2->len, 1531 IPPROTO_ICMPV6, 0)); 1532 if (__skb_checksum_complete(skb2)) 1533 goto out; 1534 } 1535 1536 err = 0; 1537 1538 br_vlan_get_tag(skb, &vid); 1539 BR_INPUT_SKB_CB(skb)->igmp = 1; 1540 1541 switch (icmp6_type) { 1542 case ICMPV6_MGM_REPORT: 1543 { 1544 struct mld_msg *mld; 1545 if (!pskb_may_pull(skb2, sizeof(*mld))) { 1546 err = -EINVAL; 1547 goto out; 1548 } 1549 mld = (struct mld_msg *)skb_transport_header(skb2); 1550 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1551 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid); 1552 break; 1553 } 1554 case ICMPV6_MLD2_REPORT: 1555 err = br_ip6_multicast_mld2_report(br, port, skb2); 1556 break; 1557 case ICMPV6_MGM_QUERY: 1558 err = br_ip6_multicast_query(br, port, skb2); 1559 break; 1560 case ICMPV6_MGM_REDUCTION: 1561 { 1562 struct mld_msg *mld; 1563 if (!pskb_may_pull(skb2, sizeof(*mld))) { 1564 err = -EINVAL; 1565 goto out; 1566 } 1567 mld = (struct mld_msg *)skb_transport_header(skb2); 1568 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid); 1569 } 1570 } 1571 1572 out: 1573 kfree_skb(skb2); 1574 return err; 1575 } 1576 #endif 1577 1578 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 1579 struct sk_buff *skb) 1580 { 1581 BR_INPUT_SKB_CB(skb)->igmp = 0; 1582 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 1583 1584 if (br->multicast_disabled) 1585 return 0; 1586 1587 switch (skb->protocol) { 1588 case htons(ETH_P_IP): 1589 return br_multicast_ipv4_rcv(br, port, skb); 1590 #if IS_ENABLED(CONFIG_IPV6) 1591 case htons(ETH_P_IPV6): 1592 return br_multicast_ipv6_rcv(br, port, skb); 1593 #endif 1594 } 1595 1596 return 0; 1597 } 1598 1599 static void br_multicast_query_expired(unsigned long data) 1600 { 1601 struct net_bridge *br = (void *)data; 1602 1603 spin_lock(&br->multicast_lock); 1604 if (br->multicast_startup_queries_sent < 1605 br->multicast_startup_query_count) 1606 br->multicast_startup_queries_sent++; 1607 1608 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent); 1609 1610 spin_unlock(&br->multicast_lock); 1611 } 1612 1613 void br_multicast_init(struct net_bridge *br) 1614 { 1615 br->hash_elasticity = 4; 1616 br->hash_max = 512; 1617 1618 br->multicast_router = 1; 1619 br->multicast_querier = 0; 1620 br->multicast_last_member_count = 2; 1621 br->multicast_startup_query_count = 2; 1622 1623 br->multicast_last_member_interval = HZ; 1624 br->multicast_query_response_interval = 10 * HZ; 1625 br->multicast_startup_query_interval = 125 * HZ / 4; 1626 br->multicast_query_interval = 125 * HZ; 1627 br->multicast_querier_interval = 255 * HZ; 1628 br->multicast_membership_interval = 260 * HZ; 1629 1630 spin_lock_init(&br->multicast_lock); 1631 setup_timer(&br->multicast_router_timer, 1632 br_multicast_local_router_expired, 0); 1633 setup_timer(&br->multicast_querier_timer, 1634 br_multicast_querier_expired, (unsigned long)br); 1635 setup_timer(&br->multicast_query_timer, br_multicast_query_expired, 1636 (unsigned long)br); 1637 } 1638 1639 void br_multicast_open(struct net_bridge *br) 1640 { 1641 br->multicast_startup_queries_sent = 0; 1642 1643 if (br->multicast_disabled) 1644 return; 1645 1646 mod_timer(&br->multicast_query_timer, jiffies); 1647 } 1648 1649 void br_multicast_stop(struct net_bridge *br) 1650 { 1651 struct net_bridge_mdb_htable *mdb; 1652 struct net_bridge_mdb_entry *mp; 1653 struct hlist_node *n; 1654 u32 ver; 1655 int i; 1656 1657 del_timer_sync(&br->multicast_router_timer); 1658 del_timer_sync(&br->multicast_querier_timer); 1659 del_timer_sync(&br->multicast_query_timer); 1660 1661 spin_lock_bh(&br->multicast_lock); 1662 mdb = mlock_dereference(br->mdb, br); 1663 if (!mdb) 1664 goto out; 1665 1666 br->mdb = NULL; 1667 1668 ver = mdb->ver; 1669 for (i = 0; i < mdb->max; i++) { 1670 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i], 1671 hlist[ver]) { 1672 del_timer(&mp->timer); 1673 call_rcu_bh(&mp->rcu, br_multicast_free_group); 1674 } 1675 } 1676 1677 if (mdb->old) { 1678 spin_unlock_bh(&br->multicast_lock); 1679 rcu_barrier_bh(); 1680 spin_lock_bh(&br->multicast_lock); 1681 WARN_ON(mdb->old); 1682 } 1683 1684 mdb->old = mdb; 1685 call_rcu_bh(&mdb->rcu, br_mdb_free); 1686 1687 out: 1688 spin_unlock_bh(&br->multicast_lock); 1689 } 1690 1691 int br_multicast_set_router(struct net_bridge *br, unsigned long val) 1692 { 1693 int err = -ENOENT; 1694 1695 spin_lock_bh(&br->multicast_lock); 1696 if (!netif_running(br->dev)) 1697 goto unlock; 1698 1699 switch (val) { 1700 case 0: 1701 case 2: 1702 del_timer(&br->multicast_router_timer); 1703 /* fall through */ 1704 case 1: 1705 br->multicast_router = val; 1706 err = 0; 1707 break; 1708 1709 default: 1710 err = -EINVAL; 1711 break; 1712 } 1713 1714 unlock: 1715 spin_unlock_bh(&br->multicast_lock); 1716 1717 return err; 1718 } 1719 1720 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) 1721 { 1722 struct net_bridge *br = p->br; 1723 int err = -ENOENT; 1724 1725 spin_lock(&br->multicast_lock); 1726 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) 1727 goto unlock; 1728 1729 switch (val) { 1730 case 0: 1731 case 1: 1732 case 2: 1733 p->multicast_router = val; 1734 err = 0; 1735 1736 if (val < 2 && !hlist_unhashed(&p->rlist)) 1737 hlist_del_init_rcu(&p->rlist); 1738 1739 if (val == 1) 1740 break; 1741 1742 del_timer(&p->multicast_router_timer); 1743 1744 if (val == 0) 1745 break; 1746 1747 br_multicast_add_router(br, p); 1748 break; 1749 1750 default: 1751 err = -EINVAL; 1752 break; 1753 } 1754 1755 unlock: 1756 spin_unlock(&br->multicast_lock); 1757 1758 return err; 1759 } 1760 1761 static void br_multicast_start_querier(struct net_bridge *br) 1762 { 1763 struct net_bridge_port *port; 1764 1765 br_multicast_open(br); 1766 1767 list_for_each_entry(port, &br->port_list, list) { 1768 if (port->state == BR_STATE_DISABLED || 1769 port->state == BR_STATE_BLOCKING) 1770 continue; 1771 1772 __br_multicast_enable_port(port); 1773 } 1774 } 1775 1776 int br_multicast_toggle(struct net_bridge *br, unsigned long val) 1777 { 1778 int err = 0; 1779 struct net_bridge_mdb_htable *mdb; 1780 1781 spin_lock_bh(&br->multicast_lock); 1782 if (br->multicast_disabled == !val) 1783 goto unlock; 1784 1785 br->multicast_disabled = !val; 1786 if (br->multicast_disabled) 1787 goto unlock; 1788 1789 if (!netif_running(br->dev)) 1790 goto unlock; 1791 1792 mdb = mlock_dereference(br->mdb, br); 1793 if (mdb) { 1794 if (mdb->old) { 1795 err = -EEXIST; 1796 rollback: 1797 br->multicast_disabled = !!val; 1798 goto unlock; 1799 } 1800 1801 err = br_mdb_rehash(&br->mdb, mdb->max, 1802 br->hash_elasticity); 1803 if (err) 1804 goto rollback; 1805 } 1806 1807 br_multicast_start_querier(br); 1808 1809 unlock: 1810 spin_unlock_bh(&br->multicast_lock); 1811 1812 return err; 1813 } 1814 1815 int br_multicast_set_querier(struct net_bridge *br, unsigned long val) 1816 { 1817 val = !!val; 1818 1819 spin_lock_bh(&br->multicast_lock); 1820 if (br->multicast_querier == val) 1821 goto unlock; 1822 1823 br->multicast_querier = val; 1824 if (val) 1825 br_multicast_start_querier(br); 1826 1827 unlock: 1828 spin_unlock_bh(&br->multicast_lock); 1829 1830 return 0; 1831 } 1832 1833 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) 1834 { 1835 int err = -ENOENT; 1836 u32 old; 1837 struct net_bridge_mdb_htable *mdb; 1838 1839 spin_lock(&br->multicast_lock); 1840 if (!netif_running(br->dev)) 1841 goto unlock; 1842 1843 err = -EINVAL; 1844 if (!is_power_of_2(val)) 1845 goto unlock; 1846 1847 mdb = mlock_dereference(br->mdb, br); 1848 if (mdb && val < mdb->size) 1849 goto unlock; 1850 1851 err = 0; 1852 1853 old = br->hash_max; 1854 br->hash_max = val; 1855 1856 if (mdb) { 1857 if (mdb->old) { 1858 err = -EEXIST; 1859 rollback: 1860 br->hash_max = old; 1861 goto unlock; 1862 } 1863 1864 err = br_mdb_rehash(&br->mdb, br->hash_max, 1865 br->hash_elasticity); 1866 if (err) 1867 goto rollback; 1868 } 1869 1870 unlock: 1871 spin_unlock(&br->multicast_lock); 1872 1873 return err; 1874 } 1875