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/export.h> 15 #include <linux/if_ether.h> 16 #include <linux/igmp.h> 17 #include <linux/jhash.h> 18 #include <linux/kernel.h> 19 #include <linux/log2.h> 20 #include <linux/netdevice.h> 21 #include <linux/netfilter_bridge.h> 22 #include <linux/random.h> 23 #include <linux/rculist.h> 24 #include <linux/skbuff.h> 25 #include <linux/slab.h> 26 #include <linux/timer.h> 27 #include <linux/inetdevice.h> 28 #include <linux/mroute.h> 29 #include <net/ip.h> 30 #include <net/switchdev.h> 31 #if IS_ENABLED(CONFIG_IPV6) 32 #include <net/ipv6.h> 33 #include <net/mld.h> 34 #include <net/ip6_checksum.h> 35 #include <net/addrconf.h> 36 #endif 37 38 #include "br_private.h" 39 40 static void br_multicast_start_querier(struct net_bridge *br, 41 struct bridge_mcast_own_query *query); 42 static void br_multicast_add_router(struct net_bridge *br, 43 struct net_bridge_port *port); 44 static void br_ip4_multicast_leave_group(struct net_bridge *br, 45 struct net_bridge_port *port, 46 __be32 group, 47 __u16 vid, 48 const unsigned char *src); 49 50 static void __del_port_router(struct net_bridge_port *p); 51 #if IS_ENABLED(CONFIG_IPV6) 52 static void br_ip6_multicast_leave_group(struct net_bridge *br, 53 struct net_bridge_port *port, 54 const struct in6_addr *group, 55 __u16 vid, const unsigned char *src); 56 #endif 57 unsigned int br_mdb_rehash_seq; 58 59 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b) 60 { 61 if (a->proto != b->proto) 62 return 0; 63 if (a->vid != b->vid) 64 return 0; 65 switch (a->proto) { 66 case htons(ETH_P_IP): 67 return a->u.ip4 == b->u.ip4; 68 #if IS_ENABLED(CONFIG_IPV6) 69 case htons(ETH_P_IPV6): 70 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6); 71 #endif 72 } 73 return 0; 74 } 75 76 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip, 77 __u16 vid) 78 { 79 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1); 80 } 81 82 #if IS_ENABLED(CONFIG_IPV6) 83 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb, 84 const struct in6_addr *ip, 85 __u16 vid) 86 { 87 return jhash_2words(ipv6_addr_hash(ip), vid, 88 mdb->secret) & (mdb->max - 1); 89 } 90 #endif 91 92 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, 93 struct br_ip *ip) 94 { 95 switch (ip->proto) { 96 case htons(ETH_P_IP): 97 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid); 98 #if IS_ENABLED(CONFIG_IPV6) 99 case htons(ETH_P_IPV6): 100 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid); 101 #endif 102 } 103 return 0; 104 } 105 106 static struct net_bridge_mdb_entry *__br_mdb_ip_get( 107 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash) 108 { 109 struct net_bridge_mdb_entry *mp; 110 111 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) { 112 if (br_ip_equal(&mp->addr, dst)) 113 return mp; 114 } 115 116 return NULL; 117 } 118 119 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, 120 struct br_ip *dst) 121 { 122 if (!mdb) 123 return NULL; 124 125 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); 126 } 127 128 static struct net_bridge_mdb_entry *br_mdb_ip4_get( 129 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid) 130 { 131 struct br_ip br_dst; 132 133 br_dst.u.ip4 = dst; 134 br_dst.proto = htons(ETH_P_IP); 135 br_dst.vid = vid; 136 137 return br_mdb_ip_get(mdb, &br_dst); 138 } 139 140 #if IS_ENABLED(CONFIG_IPV6) 141 static struct net_bridge_mdb_entry *br_mdb_ip6_get( 142 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst, 143 __u16 vid) 144 { 145 struct br_ip br_dst; 146 147 br_dst.u.ip6 = *dst; 148 br_dst.proto = htons(ETH_P_IPV6); 149 br_dst.vid = vid; 150 151 return br_mdb_ip_get(mdb, &br_dst); 152 } 153 #endif 154 155 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 156 struct sk_buff *skb, u16 vid) 157 { 158 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb); 159 struct br_ip ip; 160 161 if (br->multicast_disabled) 162 return NULL; 163 164 if (BR_INPUT_SKB_CB(skb)->igmp) 165 return NULL; 166 167 ip.proto = skb->protocol; 168 ip.vid = vid; 169 170 switch (skb->protocol) { 171 case htons(ETH_P_IP): 172 ip.u.ip4 = ip_hdr(skb)->daddr; 173 break; 174 #if IS_ENABLED(CONFIG_IPV6) 175 case htons(ETH_P_IPV6): 176 ip.u.ip6 = ipv6_hdr(skb)->daddr; 177 break; 178 #endif 179 default: 180 return NULL; 181 } 182 183 return br_mdb_ip_get(mdb, &ip); 184 } 185 186 static void br_mdb_free(struct rcu_head *head) 187 { 188 struct net_bridge_mdb_htable *mdb = 189 container_of(head, struct net_bridge_mdb_htable, rcu); 190 struct net_bridge_mdb_htable *old = mdb->old; 191 192 mdb->old = NULL; 193 kfree(old->mhash); 194 kfree(old); 195 } 196 197 static int br_mdb_copy(struct net_bridge_mdb_htable *new, 198 struct net_bridge_mdb_htable *old, 199 int elasticity) 200 { 201 struct net_bridge_mdb_entry *mp; 202 int maxlen; 203 int len; 204 int i; 205 206 for (i = 0; i < old->max; i++) 207 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver]) 208 hlist_add_head(&mp->hlist[new->ver], 209 &new->mhash[br_ip_hash(new, &mp->addr)]); 210 211 if (!elasticity) 212 return 0; 213 214 maxlen = 0; 215 for (i = 0; i < new->max; i++) { 216 len = 0; 217 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver]) 218 len++; 219 if (len > maxlen) 220 maxlen = len; 221 } 222 223 return maxlen > elasticity ? -EINVAL : 0; 224 } 225 226 void br_multicast_free_pg(struct rcu_head *head) 227 { 228 struct net_bridge_port_group *p = 229 container_of(head, struct net_bridge_port_group, rcu); 230 231 kfree(p); 232 } 233 234 static void br_multicast_free_group(struct rcu_head *head) 235 { 236 struct net_bridge_mdb_entry *mp = 237 container_of(head, struct net_bridge_mdb_entry, rcu); 238 239 kfree(mp); 240 } 241 242 static void br_multicast_group_expired(struct timer_list *t) 243 { 244 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer); 245 struct net_bridge *br = mp->br; 246 struct net_bridge_mdb_htable *mdb; 247 248 spin_lock(&br->multicast_lock); 249 if (!netif_running(br->dev) || timer_pending(&mp->timer)) 250 goto out; 251 252 mp->host_joined = false; 253 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0); 254 255 if (mp->ports) 256 goto out; 257 258 mdb = mlock_dereference(br->mdb, br); 259 260 hlist_del_rcu(&mp->hlist[mdb->ver]); 261 mdb->size--; 262 263 call_rcu_bh(&mp->rcu, br_multicast_free_group); 264 265 out: 266 spin_unlock(&br->multicast_lock); 267 } 268 269 static void br_multicast_del_pg(struct net_bridge *br, 270 struct net_bridge_port_group *pg) 271 { 272 struct net_bridge_mdb_htable *mdb; 273 struct net_bridge_mdb_entry *mp; 274 struct net_bridge_port_group *p; 275 struct net_bridge_port_group __rcu **pp; 276 277 mdb = mlock_dereference(br->mdb, br); 278 279 mp = br_mdb_ip_get(mdb, &pg->addr); 280 if (WARN_ON(!mp)) 281 return; 282 283 for (pp = &mp->ports; 284 (p = mlock_dereference(*pp, br)) != NULL; 285 pp = &p->next) { 286 if (p != pg) 287 continue; 288 289 rcu_assign_pointer(*pp, p->next); 290 hlist_del_init(&p->mglist); 291 del_timer(&p->timer); 292 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB, 293 p->flags); 294 call_rcu_bh(&p->rcu, br_multicast_free_pg); 295 296 if (!mp->ports && !mp->host_joined && 297 netif_running(br->dev)) 298 mod_timer(&mp->timer, jiffies); 299 300 return; 301 } 302 303 WARN_ON(1); 304 } 305 306 static void br_multicast_port_group_expired(struct timer_list *t) 307 { 308 struct net_bridge_port_group *pg = from_timer(pg, t, timer); 309 struct net_bridge *br = pg->port->br; 310 311 spin_lock(&br->multicast_lock); 312 if (!netif_running(br->dev) || timer_pending(&pg->timer) || 313 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT) 314 goto out; 315 316 br_multicast_del_pg(br, pg); 317 318 out: 319 spin_unlock(&br->multicast_lock); 320 } 321 322 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max, 323 int elasticity) 324 { 325 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1); 326 struct net_bridge_mdb_htable *mdb; 327 int err; 328 329 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC); 330 if (!mdb) 331 return -ENOMEM; 332 333 mdb->max = max; 334 mdb->old = old; 335 336 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC); 337 if (!mdb->mhash) { 338 kfree(mdb); 339 return -ENOMEM; 340 } 341 342 mdb->size = old ? old->size : 0; 343 mdb->ver = old ? old->ver ^ 1 : 0; 344 345 if (!old || elasticity) 346 get_random_bytes(&mdb->secret, sizeof(mdb->secret)); 347 else 348 mdb->secret = old->secret; 349 350 if (!old) 351 goto out; 352 353 err = br_mdb_copy(mdb, old, elasticity); 354 if (err) { 355 kfree(mdb->mhash); 356 kfree(mdb); 357 return err; 358 } 359 360 br_mdb_rehash_seq++; 361 call_rcu_bh(&mdb->rcu, br_mdb_free); 362 363 out: 364 rcu_assign_pointer(*mdbp, mdb); 365 366 return 0; 367 } 368 369 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, 370 __be32 group, 371 u8 *igmp_type) 372 { 373 struct igmpv3_query *ihv3; 374 size_t igmp_hdr_size; 375 struct sk_buff *skb; 376 struct igmphdr *ih; 377 struct ethhdr *eth; 378 struct iphdr *iph; 379 380 igmp_hdr_size = sizeof(*ih); 381 if (br->multicast_igmp_version == 3) 382 igmp_hdr_size = sizeof(*ihv3); 383 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + 384 igmp_hdr_size + 4); 385 if (!skb) 386 goto out; 387 388 skb->protocol = htons(ETH_P_IP); 389 390 skb_reset_mac_header(skb); 391 eth = eth_hdr(skb); 392 393 ether_addr_copy(eth->h_source, br->dev->dev_addr); 394 eth->h_dest[0] = 1; 395 eth->h_dest[1] = 0; 396 eth->h_dest[2] = 0x5e; 397 eth->h_dest[3] = 0; 398 eth->h_dest[4] = 0; 399 eth->h_dest[5] = 1; 400 eth->h_proto = htons(ETH_P_IP); 401 skb_put(skb, sizeof(*eth)); 402 403 skb_set_network_header(skb, skb->len); 404 iph = ip_hdr(skb); 405 406 iph->version = 4; 407 iph->ihl = 6; 408 iph->tos = 0xc0; 409 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4); 410 iph->id = 0; 411 iph->frag_off = htons(IP_DF); 412 iph->ttl = 1; 413 iph->protocol = IPPROTO_IGMP; 414 iph->saddr = br->multicast_query_use_ifaddr ? 415 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0; 416 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); 417 ((u8 *)&iph[1])[0] = IPOPT_RA; 418 ((u8 *)&iph[1])[1] = 4; 419 ((u8 *)&iph[1])[2] = 0; 420 ((u8 *)&iph[1])[3] = 0; 421 ip_send_check(iph); 422 skb_put(skb, 24); 423 424 skb_set_transport_header(skb, skb->len); 425 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY; 426 427 switch (br->multicast_igmp_version) { 428 case 2: 429 ih = igmp_hdr(skb); 430 ih->type = IGMP_HOST_MEMBERSHIP_QUERY; 431 ih->code = (group ? br->multicast_last_member_interval : 432 br->multicast_query_response_interval) / 433 (HZ / IGMP_TIMER_SCALE); 434 ih->group = group; 435 ih->csum = 0; 436 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih)); 437 break; 438 case 3: 439 ihv3 = igmpv3_query_hdr(skb); 440 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY; 441 ihv3->code = (group ? br->multicast_last_member_interval : 442 br->multicast_query_response_interval) / 443 (HZ / IGMP_TIMER_SCALE); 444 ihv3->group = group; 445 ihv3->qqic = br->multicast_query_interval / HZ; 446 ihv3->nsrcs = 0; 447 ihv3->resv = 0; 448 ihv3->suppress = 0; 449 ihv3->qrv = 2; 450 ihv3->csum = 0; 451 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3)); 452 break; 453 } 454 455 skb_put(skb, igmp_hdr_size); 456 __skb_pull(skb, sizeof(*eth)); 457 458 out: 459 return skb; 460 } 461 462 #if IS_ENABLED(CONFIG_IPV6) 463 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, 464 const struct in6_addr *grp, 465 u8 *igmp_type) 466 { 467 struct mld2_query *mld2q; 468 unsigned long interval; 469 struct ipv6hdr *ip6h; 470 struct mld_msg *mldq; 471 size_t mld_hdr_size; 472 struct sk_buff *skb; 473 struct ethhdr *eth; 474 u8 *hopopt; 475 476 mld_hdr_size = sizeof(*mldq); 477 if (br->multicast_mld_version == 2) 478 mld_hdr_size = sizeof(*mld2q); 479 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + 480 8 + mld_hdr_size); 481 if (!skb) 482 goto out; 483 484 skb->protocol = htons(ETH_P_IPV6); 485 486 /* Ethernet header */ 487 skb_reset_mac_header(skb); 488 eth = eth_hdr(skb); 489 490 ether_addr_copy(eth->h_source, br->dev->dev_addr); 491 eth->h_proto = htons(ETH_P_IPV6); 492 skb_put(skb, sizeof(*eth)); 493 494 /* IPv6 header + HbH option */ 495 skb_set_network_header(skb, skb->len); 496 ip6h = ipv6_hdr(skb); 497 498 *(__force __be32 *)ip6h = htonl(0x60000000); 499 ip6h->payload_len = htons(8 + mld_hdr_size); 500 ip6h->nexthdr = IPPROTO_HOPOPTS; 501 ip6h->hop_limit = 1; 502 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); 503 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, 504 &ip6h->saddr)) { 505 kfree_skb(skb); 506 br->has_ipv6_addr = 0; 507 return NULL; 508 } 509 510 br->has_ipv6_addr = 1; 511 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 512 513 hopopt = (u8 *)(ip6h + 1); 514 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ 515 hopopt[1] = 0; /* length of HbH */ 516 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ 517 hopopt[3] = 2; /* Length of RA Option */ 518 hopopt[4] = 0; /* Type = 0x0000 (MLD) */ 519 hopopt[5] = 0; 520 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ 521 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ 522 523 skb_put(skb, sizeof(*ip6h) + 8); 524 525 /* ICMPv6 */ 526 skb_set_transport_header(skb, skb->len); 527 interval = ipv6_addr_any(grp) ? 528 br->multicast_query_response_interval : 529 br->multicast_last_member_interval; 530 *igmp_type = ICMPV6_MGM_QUERY; 531 switch (br->multicast_mld_version) { 532 case 1: 533 mldq = (struct mld_msg *)icmp6_hdr(skb); 534 mldq->mld_type = ICMPV6_MGM_QUERY; 535 mldq->mld_code = 0; 536 mldq->mld_cksum = 0; 537 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); 538 mldq->mld_reserved = 0; 539 mldq->mld_mca = *grp; 540 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 541 sizeof(*mldq), IPPROTO_ICMPV6, 542 csum_partial(mldq, 543 sizeof(*mldq), 544 0)); 545 break; 546 case 2: 547 mld2q = (struct mld2_query *)icmp6_hdr(skb); 548 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval)); 549 mld2q->mld2q_type = ICMPV6_MGM_QUERY; 550 mld2q->mld2q_code = 0; 551 mld2q->mld2q_cksum = 0; 552 mld2q->mld2q_resv1 = 0; 553 mld2q->mld2q_resv2 = 0; 554 mld2q->mld2q_suppress = 0; 555 mld2q->mld2q_qrv = 2; 556 mld2q->mld2q_nsrcs = 0; 557 mld2q->mld2q_qqic = br->multicast_query_interval / HZ; 558 mld2q->mld2q_mca = *grp; 559 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 560 sizeof(*mld2q), 561 IPPROTO_ICMPV6, 562 csum_partial(mld2q, 563 sizeof(*mld2q), 564 0)); 565 break; 566 } 567 skb_put(skb, mld_hdr_size); 568 569 __skb_pull(skb, sizeof(*eth)); 570 571 out: 572 return skb; 573 } 574 #endif 575 576 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, 577 struct br_ip *addr, 578 u8 *igmp_type) 579 { 580 switch (addr->proto) { 581 case htons(ETH_P_IP): 582 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type); 583 #if IS_ENABLED(CONFIG_IPV6) 584 case htons(ETH_P_IPV6): 585 return br_ip6_multicast_alloc_query(br, &addr->u.ip6, 586 igmp_type); 587 #endif 588 } 589 return NULL; 590 } 591 592 static struct net_bridge_mdb_entry *br_multicast_get_group( 593 struct net_bridge *br, struct net_bridge_port *port, 594 struct br_ip *group, int hash) 595 { 596 struct net_bridge_mdb_htable *mdb; 597 struct net_bridge_mdb_entry *mp; 598 unsigned int count = 0; 599 unsigned int max; 600 int elasticity; 601 int err; 602 603 mdb = rcu_dereference_protected(br->mdb, 1); 604 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) { 605 count++; 606 if (unlikely(br_ip_equal(group, &mp->addr))) 607 return mp; 608 } 609 610 elasticity = 0; 611 max = mdb->max; 612 613 if (unlikely(count > br->hash_elasticity && count)) { 614 if (net_ratelimit()) 615 br_info(br, "Multicast hash table " 616 "chain limit reached: %s\n", 617 port ? port->dev->name : br->dev->name); 618 619 elasticity = br->hash_elasticity; 620 } 621 622 if (mdb->size >= max) { 623 max *= 2; 624 if (unlikely(max > br->hash_max)) { 625 br_warn(br, "Multicast hash table maximum of %d " 626 "reached, disabling snooping: %s\n", 627 br->hash_max, 628 port ? port->dev->name : br->dev->name); 629 err = -E2BIG; 630 disable: 631 br->multicast_disabled = 1; 632 goto err; 633 } 634 } 635 636 if (max > mdb->max || elasticity) { 637 if (mdb->old) { 638 if (net_ratelimit()) 639 br_info(br, "Multicast hash table " 640 "on fire: %s\n", 641 port ? port->dev->name : br->dev->name); 642 err = -EEXIST; 643 goto err; 644 } 645 646 err = br_mdb_rehash(&br->mdb, max, elasticity); 647 if (err) { 648 br_warn(br, "Cannot rehash multicast " 649 "hash table, disabling snooping: %s, %d, %d\n", 650 port ? port->dev->name : br->dev->name, 651 mdb->size, err); 652 goto disable; 653 } 654 655 err = -EAGAIN; 656 goto err; 657 } 658 659 return NULL; 660 661 err: 662 mp = ERR_PTR(err); 663 return mp; 664 } 665 666 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, 667 struct net_bridge_port *p, 668 struct br_ip *group) 669 { 670 struct net_bridge_mdb_htable *mdb; 671 struct net_bridge_mdb_entry *mp; 672 int hash; 673 int err; 674 675 mdb = rcu_dereference_protected(br->mdb, 1); 676 if (!mdb) { 677 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0); 678 if (err) 679 return ERR_PTR(err); 680 goto rehash; 681 } 682 683 hash = br_ip_hash(mdb, group); 684 mp = br_multicast_get_group(br, p, group, hash); 685 switch (PTR_ERR(mp)) { 686 case 0: 687 break; 688 689 case -EAGAIN: 690 rehash: 691 mdb = rcu_dereference_protected(br->mdb, 1); 692 hash = br_ip_hash(mdb, group); 693 break; 694 695 default: 696 goto out; 697 } 698 699 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 700 if (unlikely(!mp)) 701 return ERR_PTR(-ENOMEM); 702 703 mp->br = br; 704 mp->addr = *group; 705 timer_setup(&mp->timer, br_multicast_group_expired, 0); 706 707 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); 708 mdb->size++; 709 710 out: 711 return mp; 712 } 713 714 struct net_bridge_port_group *br_multicast_new_port_group( 715 struct net_bridge_port *port, 716 struct br_ip *group, 717 struct net_bridge_port_group __rcu *next, 718 unsigned char flags, 719 const unsigned char *src) 720 { 721 struct net_bridge_port_group *p; 722 723 p = kzalloc(sizeof(*p), GFP_ATOMIC); 724 if (unlikely(!p)) 725 return NULL; 726 727 p->addr = *group; 728 p->port = port; 729 p->flags = flags; 730 rcu_assign_pointer(p->next, next); 731 hlist_add_head(&p->mglist, &port->mglist); 732 timer_setup(&p->timer, br_multicast_port_group_expired, 0); 733 734 if (src) 735 memcpy(p->eth_addr, src, ETH_ALEN); 736 else 737 memset(p->eth_addr, 0xff, ETH_ALEN); 738 739 return p; 740 } 741 742 static bool br_port_group_equal(struct net_bridge_port_group *p, 743 struct net_bridge_port *port, 744 const unsigned char *src) 745 { 746 if (p->port != port) 747 return false; 748 749 if (!(port->flags & BR_MULTICAST_TO_UNICAST)) 750 return true; 751 752 return ether_addr_equal(src, p->eth_addr); 753 } 754 755 static int br_multicast_add_group(struct net_bridge *br, 756 struct net_bridge_port *port, 757 struct br_ip *group, 758 const unsigned char *src) 759 { 760 struct net_bridge_port_group __rcu **pp; 761 struct net_bridge_port_group *p; 762 struct net_bridge_mdb_entry *mp; 763 unsigned long now = jiffies; 764 int err; 765 766 spin_lock(&br->multicast_lock); 767 if (!netif_running(br->dev) || 768 (port && port->state == BR_STATE_DISABLED)) 769 goto out; 770 771 mp = br_multicast_new_group(br, port, group); 772 err = PTR_ERR(mp); 773 if (IS_ERR(mp)) 774 goto err; 775 776 if (!port) { 777 if (!mp->host_joined) { 778 mp->host_joined = true; 779 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0); 780 } 781 mod_timer(&mp->timer, now + br->multicast_membership_interval); 782 goto out; 783 } 784 785 for (pp = &mp->ports; 786 (p = mlock_dereference(*pp, br)) != NULL; 787 pp = &p->next) { 788 if (br_port_group_equal(p, port, src)) 789 goto found; 790 if ((unsigned long)p->port < (unsigned long)port) 791 break; 792 } 793 794 p = br_multicast_new_port_group(port, group, *pp, 0, src); 795 if (unlikely(!p)) 796 goto err; 797 rcu_assign_pointer(*pp, p); 798 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0); 799 800 found: 801 mod_timer(&p->timer, now + br->multicast_membership_interval); 802 out: 803 err = 0; 804 805 err: 806 spin_unlock(&br->multicast_lock); 807 return err; 808 } 809 810 static int br_ip4_multicast_add_group(struct net_bridge *br, 811 struct net_bridge_port *port, 812 __be32 group, 813 __u16 vid, 814 const unsigned char *src) 815 { 816 struct br_ip br_group; 817 818 if (ipv4_is_local_multicast(group)) 819 return 0; 820 821 br_group.u.ip4 = group; 822 br_group.proto = htons(ETH_P_IP); 823 br_group.vid = vid; 824 825 return br_multicast_add_group(br, port, &br_group, src); 826 } 827 828 #if IS_ENABLED(CONFIG_IPV6) 829 static int br_ip6_multicast_add_group(struct net_bridge *br, 830 struct net_bridge_port *port, 831 const struct in6_addr *group, 832 __u16 vid, 833 const unsigned char *src) 834 { 835 struct br_ip br_group; 836 837 if (ipv6_addr_is_ll_all_nodes(group)) 838 return 0; 839 840 br_group.u.ip6 = *group; 841 br_group.proto = htons(ETH_P_IPV6); 842 br_group.vid = vid; 843 844 return br_multicast_add_group(br, port, &br_group, src); 845 } 846 #endif 847 848 static void br_multicast_router_expired(struct timer_list *t) 849 { 850 struct net_bridge_port *port = 851 from_timer(port, t, multicast_router_timer); 852 struct net_bridge *br = port->br; 853 854 spin_lock(&br->multicast_lock); 855 if (port->multicast_router == MDB_RTR_TYPE_DISABLED || 856 port->multicast_router == MDB_RTR_TYPE_PERM || 857 timer_pending(&port->multicast_router_timer)) 858 goto out; 859 860 __del_port_router(port); 861 out: 862 spin_unlock(&br->multicast_lock); 863 } 864 865 static void br_mc_router_state_change(struct net_bridge *p, 866 bool is_mc_router) 867 { 868 struct switchdev_attr attr = { 869 .orig_dev = p->dev, 870 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER, 871 .flags = SWITCHDEV_F_DEFER, 872 .u.mrouter = is_mc_router, 873 }; 874 875 switchdev_port_attr_set(p->dev, &attr); 876 } 877 878 static void br_multicast_local_router_expired(struct timer_list *t) 879 { 880 struct net_bridge *br = from_timer(br, t, multicast_router_timer); 881 882 spin_lock(&br->multicast_lock); 883 if (br->multicast_router == MDB_RTR_TYPE_DISABLED || 884 br->multicast_router == MDB_RTR_TYPE_PERM || 885 timer_pending(&br->multicast_router_timer)) 886 goto out; 887 888 br_mc_router_state_change(br, false); 889 out: 890 spin_unlock(&br->multicast_lock); 891 } 892 893 static void br_multicast_querier_expired(struct net_bridge *br, 894 struct bridge_mcast_own_query *query) 895 { 896 spin_lock(&br->multicast_lock); 897 if (!netif_running(br->dev) || br->multicast_disabled) 898 goto out; 899 900 br_multicast_start_querier(br, query); 901 902 out: 903 spin_unlock(&br->multicast_lock); 904 } 905 906 static void br_ip4_multicast_querier_expired(struct timer_list *t) 907 { 908 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer); 909 910 br_multicast_querier_expired(br, &br->ip4_own_query); 911 } 912 913 #if IS_ENABLED(CONFIG_IPV6) 914 static void br_ip6_multicast_querier_expired(struct timer_list *t) 915 { 916 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer); 917 918 br_multicast_querier_expired(br, &br->ip6_own_query); 919 } 920 #endif 921 922 static void br_multicast_select_own_querier(struct net_bridge *br, 923 struct br_ip *ip, 924 struct sk_buff *skb) 925 { 926 if (ip->proto == htons(ETH_P_IP)) 927 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr; 928 #if IS_ENABLED(CONFIG_IPV6) 929 else 930 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr; 931 #endif 932 } 933 934 static void __br_multicast_send_query(struct net_bridge *br, 935 struct net_bridge_port *port, 936 struct br_ip *ip) 937 { 938 struct sk_buff *skb; 939 u8 igmp_type; 940 941 skb = br_multicast_alloc_query(br, ip, &igmp_type); 942 if (!skb) 943 return; 944 945 if (port) { 946 skb->dev = port->dev; 947 br_multicast_count(br, port, skb, igmp_type, 948 BR_MCAST_DIR_TX); 949 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, 950 dev_net(port->dev), NULL, skb, NULL, skb->dev, 951 br_dev_queue_push_xmit); 952 } else { 953 br_multicast_select_own_querier(br, ip, skb); 954 br_multicast_count(br, port, skb, igmp_type, 955 BR_MCAST_DIR_RX); 956 netif_rx(skb); 957 } 958 } 959 960 static void br_multicast_send_query(struct net_bridge *br, 961 struct net_bridge_port *port, 962 struct bridge_mcast_own_query *own_query) 963 { 964 struct bridge_mcast_other_query *other_query = NULL; 965 struct br_ip br_group; 966 unsigned long time; 967 968 if (!netif_running(br->dev) || br->multicast_disabled || 969 !br->multicast_querier) 970 return; 971 972 memset(&br_group.u, 0, sizeof(br_group.u)); 973 974 if (port ? (own_query == &port->ip4_own_query) : 975 (own_query == &br->ip4_own_query)) { 976 other_query = &br->ip4_other_query; 977 br_group.proto = htons(ETH_P_IP); 978 #if IS_ENABLED(CONFIG_IPV6) 979 } else { 980 other_query = &br->ip6_other_query; 981 br_group.proto = htons(ETH_P_IPV6); 982 #endif 983 } 984 985 if (!other_query || timer_pending(&other_query->timer)) 986 return; 987 988 __br_multicast_send_query(br, port, &br_group); 989 990 time = jiffies; 991 time += own_query->startup_sent < br->multicast_startup_query_count ? 992 br->multicast_startup_query_interval : 993 br->multicast_query_interval; 994 mod_timer(&own_query->timer, time); 995 } 996 997 static void 998 br_multicast_port_query_expired(struct net_bridge_port *port, 999 struct bridge_mcast_own_query *query) 1000 { 1001 struct net_bridge *br = port->br; 1002 1003 spin_lock(&br->multicast_lock); 1004 if (port->state == BR_STATE_DISABLED || 1005 port->state == BR_STATE_BLOCKING) 1006 goto out; 1007 1008 if (query->startup_sent < br->multicast_startup_query_count) 1009 query->startup_sent++; 1010 1011 br_multicast_send_query(port->br, port, query); 1012 1013 out: 1014 spin_unlock(&br->multicast_lock); 1015 } 1016 1017 static void br_ip4_multicast_port_query_expired(struct timer_list *t) 1018 { 1019 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer); 1020 1021 br_multicast_port_query_expired(port, &port->ip4_own_query); 1022 } 1023 1024 #if IS_ENABLED(CONFIG_IPV6) 1025 static void br_ip6_multicast_port_query_expired(struct timer_list *t) 1026 { 1027 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer); 1028 1029 br_multicast_port_query_expired(port, &port->ip6_own_query); 1030 } 1031 #endif 1032 1033 static void br_mc_disabled_update(struct net_device *dev, bool value) 1034 { 1035 struct switchdev_attr attr = { 1036 .orig_dev = dev, 1037 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED, 1038 .flags = SWITCHDEV_F_DEFER, 1039 .u.mc_disabled = value, 1040 }; 1041 1042 switchdev_port_attr_set(dev, &attr); 1043 } 1044 1045 int br_multicast_add_port(struct net_bridge_port *port) 1046 { 1047 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1048 1049 timer_setup(&port->multicast_router_timer, 1050 br_multicast_router_expired, 0); 1051 timer_setup(&port->ip4_own_query.timer, 1052 br_ip4_multicast_port_query_expired, 0); 1053 #if IS_ENABLED(CONFIG_IPV6) 1054 timer_setup(&port->ip6_own_query.timer, 1055 br_ip6_multicast_port_query_expired, 0); 1056 #endif 1057 br_mc_disabled_update(port->dev, port->br->multicast_disabled); 1058 1059 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 1060 if (!port->mcast_stats) 1061 return -ENOMEM; 1062 1063 return 0; 1064 } 1065 1066 void br_multicast_del_port(struct net_bridge_port *port) 1067 { 1068 struct net_bridge *br = port->br; 1069 struct net_bridge_port_group *pg; 1070 struct hlist_node *n; 1071 1072 /* Take care of the remaining groups, only perm ones should be left */ 1073 spin_lock_bh(&br->multicast_lock); 1074 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 1075 br_multicast_del_pg(br, pg); 1076 spin_unlock_bh(&br->multicast_lock); 1077 del_timer_sync(&port->multicast_router_timer); 1078 free_percpu(port->mcast_stats); 1079 } 1080 1081 static void br_multicast_enable(struct bridge_mcast_own_query *query) 1082 { 1083 query->startup_sent = 0; 1084 1085 if (try_to_del_timer_sync(&query->timer) >= 0 || 1086 del_timer(&query->timer)) 1087 mod_timer(&query->timer, jiffies); 1088 } 1089 1090 static void __br_multicast_enable_port(struct net_bridge_port *port) 1091 { 1092 struct net_bridge *br = port->br; 1093 1094 if (br->multicast_disabled || !netif_running(br->dev)) 1095 return; 1096 1097 br_multicast_enable(&port->ip4_own_query); 1098 #if IS_ENABLED(CONFIG_IPV6) 1099 br_multicast_enable(&port->ip6_own_query); 1100 #endif 1101 if (port->multicast_router == MDB_RTR_TYPE_PERM && 1102 hlist_unhashed(&port->rlist)) 1103 br_multicast_add_router(br, port); 1104 } 1105 1106 void br_multicast_enable_port(struct net_bridge_port *port) 1107 { 1108 struct net_bridge *br = port->br; 1109 1110 spin_lock(&br->multicast_lock); 1111 __br_multicast_enable_port(port); 1112 spin_unlock(&br->multicast_lock); 1113 } 1114 1115 void br_multicast_disable_port(struct net_bridge_port *port) 1116 { 1117 struct net_bridge *br = port->br; 1118 struct net_bridge_port_group *pg; 1119 struct hlist_node *n; 1120 1121 spin_lock(&br->multicast_lock); 1122 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 1123 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT)) 1124 br_multicast_del_pg(br, pg); 1125 1126 __del_port_router(port); 1127 1128 del_timer(&port->multicast_router_timer); 1129 del_timer(&port->ip4_own_query.timer); 1130 #if IS_ENABLED(CONFIG_IPV6) 1131 del_timer(&port->ip6_own_query.timer); 1132 #endif 1133 spin_unlock(&br->multicast_lock); 1134 } 1135 1136 static int br_ip4_multicast_igmp3_report(struct net_bridge *br, 1137 struct net_bridge_port *port, 1138 struct sk_buff *skb, 1139 u16 vid) 1140 { 1141 const unsigned char *src; 1142 struct igmpv3_report *ih; 1143 struct igmpv3_grec *grec; 1144 int i; 1145 int len; 1146 int num; 1147 int type; 1148 int err = 0; 1149 __be32 group; 1150 1151 ih = igmpv3_report_hdr(skb); 1152 num = ntohs(ih->ngrec); 1153 len = skb_transport_offset(skb) + sizeof(*ih); 1154 1155 for (i = 0; i < num; i++) { 1156 len += sizeof(*grec); 1157 if (!pskb_may_pull(skb, len)) 1158 return -EINVAL; 1159 1160 grec = (void *)(skb->data + len - sizeof(*grec)); 1161 group = grec->grec_mca; 1162 type = grec->grec_type; 1163 1164 len += ntohs(grec->grec_nsrcs) * 4; 1165 if (!pskb_may_pull(skb, len)) 1166 return -EINVAL; 1167 1168 /* We treat this as an IGMPv2 report for now. */ 1169 switch (type) { 1170 case IGMPV3_MODE_IS_INCLUDE: 1171 case IGMPV3_MODE_IS_EXCLUDE: 1172 case IGMPV3_CHANGE_TO_INCLUDE: 1173 case IGMPV3_CHANGE_TO_EXCLUDE: 1174 case IGMPV3_ALLOW_NEW_SOURCES: 1175 case IGMPV3_BLOCK_OLD_SOURCES: 1176 break; 1177 1178 default: 1179 continue; 1180 } 1181 1182 src = eth_hdr(skb)->h_source; 1183 if ((type == IGMPV3_CHANGE_TO_INCLUDE || 1184 type == IGMPV3_MODE_IS_INCLUDE) && 1185 ntohs(grec->grec_nsrcs) == 0) { 1186 br_ip4_multicast_leave_group(br, port, group, vid, src); 1187 } else { 1188 err = br_ip4_multicast_add_group(br, port, group, vid, 1189 src); 1190 if (err) 1191 break; 1192 } 1193 } 1194 1195 return err; 1196 } 1197 1198 #if IS_ENABLED(CONFIG_IPV6) 1199 static int br_ip6_multicast_mld2_report(struct net_bridge *br, 1200 struct net_bridge_port *port, 1201 struct sk_buff *skb, 1202 u16 vid) 1203 { 1204 const unsigned char *src; 1205 struct icmp6hdr *icmp6h; 1206 struct mld2_grec *grec; 1207 int i; 1208 int len; 1209 int num; 1210 int err = 0; 1211 1212 if (!pskb_may_pull(skb, sizeof(*icmp6h))) 1213 return -EINVAL; 1214 1215 icmp6h = icmp6_hdr(skb); 1216 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 1217 len = skb_transport_offset(skb) + sizeof(*icmp6h); 1218 1219 for (i = 0; i < num; i++) { 1220 __be16 *nsrcs, _nsrcs; 1221 1222 nsrcs = skb_header_pointer(skb, 1223 len + offsetof(struct mld2_grec, 1224 grec_nsrcs), 1225 sizeof(_nsrcs), &_nsrcs); 1226 if (!nsrcs) 1227 return -EINVAL; 1228 1229 if (!pskb_may_pull(skb, 1230 len + sizeof(*grec) + 1231 sizeof(struct in6_addr) * ntohs(*nsrcs))) 1232 return -EINVAL; 1233 1234 grec = (struct mld2_grec *)(skb->data + len); 1235 len += sizeof(*grec) + 1236 sizeof(struct in6_addr) * ntohs(*nsrcs); 1237 1238 /* We treat these as MLDv1 reports for now. */ 1239 switch (grec->grec_type) { 1240 case MLD2_MODE_IS_INCLUDE: 1241 case MLD2_MODE_IS_EXCLUDE: 1242 case MLD2_CHANGE_TO_INCLUDE: 1243 case MLD2_CHANGE_TO_EXCLUDE: 1244 case MLD2_ALLOW_NEW_SOURCES: 1245 case MLD2_BLOCK_OLD_SOURCES: 1246 break; 1247 1248 default: 1249 continue; 1250 } 1251 1252 src = eth_hdr(skb)->h_source; 1253 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE || 1254 grec->grec_type == MLD2_MODE_IS_INCLUDE) && 1255 ntohs(*nsrcs) == 0) { 1256 br_ip6_multicast_leave_group(br, port, &grec->grec_mca, 1257 vid, src); 1258 } else { 1259 err = br_ip6_multicast_add_group(br, port, 1260 &grec->grec_mca, vid, 1261 src); 1262 if (err) 1263 break; 1264 } 1265 } 1266 1267 return err; 1268 } 1269 #endif 1270 1271 static bool br_ip4_multicast_select_querier(struct net_bridge *br, 1272 struct net_bridge_port *port, 1273 __be32 saddr) 1274 { 1275 if (!timer_pending(&br->ip4_own_query.timer) && 1276 !timer_pending(&br->ip4_other_query.timer)) 1277 goto update; 1278 1279 if (!br->ip4_querier.addr.u.ip4) 1280 goto update; 1281 1282 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4)) 1283 goto update; 1284 1285 return false; 1286 1287 update: 1288 br->ip4_querier.addr.u.ip4 = saddr; 1289 1290 /* update protected by general multicast_lock by caller */ 1291 rcu_assign_pointer(br->ip4_querier.port, port); 1292 1293 return true; 1294 } 1295 1296 #if IS_ENABLED(CONFIG_IPV6) 1297 static bool br_ip6_multicast_select_querier(struct net_bridge *br, 1298 struct net_bridge_port *port, 1299 struct in6_addr *saddr) 1300 { 1301 if (!timer_pending(&br->ip6_own_query.timer) && 1302 !timer_pending(&br->ip6_other_query.timer)) 1303 goto update; 1304 1305 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0) 1306 goto update; 1307 1308 return false; 1309 1310 update: 1311 br->ip6_querier.addr.u.ip6 = *saddr; 1312 1313 /* update protected by general multicast_lock by caller */ 1314 rcu_assign_pointer(br->ip6_querier.port, port); 1315 1316 return true; 1317 } 1318 #endif 1319 1320 static bool br_multicast_select_querier(struct net_bridge *br, 1321 struct net_bridge_port *port, 1322 struct br_ip *saddr) 1323 { 1324 switch (saddr->proto) { 1325 case htons(ETH_P_IP): 1326 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4); 1327 #if IS_ENABLED(CONFIG_IPV6) 1328 case htons(ETH_P_IPV6): 1329 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6); 1330 #endif 1331 } 1332 1333 return false; 1334 } 1335 1336 static void 1337 br_multicast_update_query_timer(struct net_bridge *br, 1338 struct bridge_mcast_other_query *query, 1339 unsigned long max_delay) 1340 { 1341 if (!timer_pending(&query->timer)) 1342 query->delay_time = jiffies + max_delay; 1343 1344 mod_timer(&query->timer, jiffies + br->multicast_querier_interval); 1345 } 1346 1347 static void br_port_mc_router_state_change(struct net_bridge_port *p, 1348 bool is_mc_router) 1349 { 1350 struct switchdev_attr attr = { 1351 .orig_dev = p->dev, 1352 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER, 1353 .flags = SWITCHDEV_F_DEFER, 1354 .u.mrouter = is_mc_router, 1355 }; 1356 1357 switchdev_port_attr_set(p->dev, &attr); 1358 } 1359 1360 /* 1361 * Add port to router_list 1362 * list is maintained ordered by pointer value 1363 * and locked by br->multicast_lock and RCU 1364 */ 1365 static void br_multicast_add_router(struct net_bridge *br, 1366 struct net_bridge_port *port) 1367 { 1368 struct net_bridge_port *p; 1369 struct hlist_node *slot = NULL; 1370 1371 if (!hlist_unhashed(&port->rlist)) 1372 return; 1373 1374 hlist_for_each_entry(p, &br->router_list, rlist) { 1375 if ((unsigned long) port >= (unsigned long) p) 1376 break; 1377 slot = &p->rlist; 1378 } 1379 1380 if (slot) 1381 hlist_add_behind_rcu(&port->rlist, slot); 1382 else 1383 hlist_add_head_rcu(&port->rlist, &br->router_list); 1384 br_rtr_notify(br->dev, port, RTM_NEWMDB); 1385 br_port_mc_router_state_change(port, true); 1386 } 1387 1388 static void br_multicast_mark_router(struct net_bridge *br, 1389 struct net_bridge_port *port) 1390 { 1391 unsigned long now = jiffies; 1392 1393 if (!port) { 1394 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) { 1395 if (!timer_pending(&br->multicast_router_timer)) 1396 br_mc_router_state_change(br, true); 1397 mod_timer(&br->multicast_router_timer, 1398 now + br->multicast_querier_interval); 1399 } 1400 return; 1401 } 1402 1403 if (port->multicast_router == MDB_RTR_TYPE_DISABLED || 1404 port->multicast_router == MDB_RTR_TYPE_PERM) 1405 return; 1406 1407 br_multicast_add_router(br, port); 1408 1409 mod_timer(&port->multicast_router_timer, 1410 now + br->multicast_querier_interval); 1411 } 1412 1413 static void br_multicast_query_received(struct net_bridge *br, 1414 struct net_bridge_port *port, 1415 struct bridge_mcast_other_query *query, 1416 struct br_ip *saddr, 1417 unsigned long max_delay) 1418 { 1419 if (!br_multicast_select_querier(br, port, saddr)) 1420 return; 1421 1422 br_multicast_update_query_timer(br, query, max_delay); 1423 br_multicast_mark_router(br, port); 1424 } 1425 1426 static int br_ip4_multicast_query(struct net_bridge *br, 1427 struct net_bridge_port *port, 1428 struct sk_buff *skb, 1429 u16 vid) 1430 { 1431 const struct iphdr *iph = ip_hdr(skb); 1432 struct igmphdr *ih = igmp_hdr(skb); 1433 struct net_bridge_mdb_entry *mp; 1434 struct igmpv3_query *ih3; 1435 struct net_bridge_port_group *p; 1436 struct net_bridge_port_group __rcu **pp; 1437 struct br_ip saddr; 1438 unsigned long max_delay; 1439 unsigned long now = jiffies; 1440 unsigned int offset = skb_transport_offset(skb); 1441 __be32 group; 1442 int err = 0; 1443 1444 spin_lock(&br->multicast_lock); 1445 if (!netif_running(br->dev) || 1446 (port && port->state == BR_STATE_DISABLED)) 1447 goto out; 1448 1449 group = ih->group; 1450 1451 if (skb->len == offset + sizeof(*ih)) { 1452 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 1453 1454 if (!max_delay) { 1455 max_delay = 10 * HZ; 1456 group = 0; 1457 } 1458 } else if (skb->len >= offset + sizeof(*ih3)) { 1459 ih3 = igmpv3_query_hdr(skb); 1460 if (ih3->nsrcs) 1461 goto out; 1462 1463 max_delay = ih3->code ? 1464 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 1465 } else { 1466 goto out; 1467 } 1468 1469 if (!group) { 1470 saddr.proto = htons(ETH_P_IP); 1471 saddr.u.ip4 = iph->saddr; 1472 1473 br_multicast_query_received(br, port, &br->ip4_other_query, 1474 &saddr, max_delay); 1475 goto out; 1476 } 1477 1478 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid); 1479 if (!mp) 1480 goto out; 1481 1482 max_delay *= br->multicast_last_member_count; 1483 1484 if (mp->host_joined && 1485 (timer_pending(&mp->timer) ? 1486 time_after(mp->timer.expires, now + max_delay) : 1487 try_to_del_timer_sync(&mp->timer) >= 0)) 1488 mod_timer(&mp->timer, now + max_delay); 1489 1490 for (pp = &mp->ports; 1491 (p = mlock_dereference(*pp, br)) != NULL; 1492 pp = &p->next) { 1493 if (timer_pending(&p->timer) ? 1494 time_after(p->timer.expires, now + max_delay) : 1495 try_to_del_timer_sync(&p->timer) >= 0) 1496 mod_timer(&p->timer, now + max_delay); 1497 } 1498 1499 out: 1500 spin_unlock(&br->multicast_lock); 1501 return err; 1502 } 1503 1504 #if IS_ENABLED(CONFIG_IPV6) 1505 static int br_ip6_multicast_query(struct net_bridge *br, 1506 struct net_bridge_port *port, 1507 struct sk_buff *skb, 1508 u16 vid) 1509 { 1510 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 1511 struct mld_msg *mld; 1512 struct net_bridge_mdb_entry *mp; 1513 struct mld2_query *mld2q; 1514 struct net_bridge_port_group *p; 1515 struct net_bridge_port_group __rcu **pp; 1516 struct br_ip saddr; 1517 unsigned long max_delay; 1518 unsigned long now = jiffies; 1519 unsigned int offset = skb_transport_offset(skb); 1520 const struct in6_addr *group = NULL; 1521 bool is_general_query; 1522 int err = 0; 1523 1524 spin_lock(&br->multicast_lock); 1525 if (!netif_running(br->dev) || 1526 (port && port->state == BR_STATE_DISABLED)) 1527 goto out; 1528 1529 if (skb->len == offset + sizeof(*mld)) { 1530 if (!pskb_may_pull(skb, offset + sizeof(*mld))) { 1531 err = -EINVAL; 1532 goto out; 1533 } 1534 mld = (struct mld_msg *) icmp6_hdr(skb); 1535 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); 1536 if (max_delay) 1537 group = &mld->mld_mca; 1538 } else { 1539 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) { 1540 err = -EINVAL; 1541 goto out; 1542 } 1543 mld2q = (struct mld2_query *)icmp6_hdr(skb); 1544 if (!mld2q->mld2q_nsrcs) 1545 group = &mld2q->mld2q_mca; 1546 1547 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); 1548 } 1549 1550 is_general_query = group && ipv6_addr_any(group); 1551 1552 if (is_general_query) { 1553 saddr.proto = htons(ETH_P_IPV6); 1554 saddr.u.ip6 = ip6h->saddr; 1555 1556 br_multicast_query_received(br, port, &br->ip6_other_query, 1557 &saddr, max_delay); 1558 goto out; 1559 } else if (!group) { 1560 goto out; 1561 } 1562 1563 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid); 1564 if (!mp) 1565 goto out; 1566 1567 max_delay *= br->multicast_last_member_count; 1568 if (mp->host_joined && 1569 (timer_pending(&mp->timer) ? 1570 time_after(mp->timer.expires, now + max_delay) : 1571 try_to_del_timer_sync(&mp->timer) >= 0)) 1572 mod_timer(&mp->timer, now + max_delay); 1573 1574 for (pp = &mp->ports; 1575 (p = mlock_dereference(*pp, br)) != NULL; 1576 pp = &p->next) { 1577 if (timer_pending(&p->timer) ? 1578 time_after(p->timer.expires, now + max_delay) : 1579 try_to_del_timer_sync(&p->timer) >= 0) 1580 mod_timer(&p->timer, now + max_delay); 1581 } 1582 1583 out: 1584 spin_unlock(&br->multicast_lock); 1585 return err; 1586 } 1587 #endif 1588 1589 static void 1590 br_multicast_leave_group(struct net_bridge *br, 1591 struct net_bridge_port *port, 1592 struct br_ip *group, 1593 struct bridge_mcast_other_query *other_query, 1594 struct bridge_mcast_own_query *own_query, 1595 const unsigned char *src) 1596 { 1597 struct net_bridge_mdb_htable *mdb; 1598 struct net_bridge_mdb_entry *mp; 1599 struct net_bridge_port_group *p; 1600 unsigned long now; 1601 unsigned long time; 1602 1603 spin_lock(&br->multicast_lock); 1604 if (!netif_running(br->dev) || 1605 (port && port->state == BR_STATE_DISABLED)) 1606 goto out; 1607 1608 mdb = mlock_dereference(br->mdb, br); 1609 mp = br_mdb_ip_get(mdb, group); 1610 if (!mp) 1611 goto out; 1612 1613 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { 1614 struct net_bridge_port_group __rcu **pp; 1615 1616 for (pp = &mp->ports; 1617 (p = mlock_dereference(*pp, br)) != NULL; 1618 pp = &p->next) { 1619 if (!br_port_group_equal(p, port, src)) 1620 continue; 1621 1622 rcu_assign_pointer(*pp, p->next); 1623 hlist_del_init(&p->mglist); 1624 del_timer(&p->timer); 1625 call_rcu_bh(&p->rcu, br_multicast_free_pg); 1626 br_mdb_notify(br->dev, port, group, RTM_DELMDB, 1627 p->flags); 1628 1629 if (!mp->ports && !mp->host_joined && 1630 netif_running(br->dev)) 1631 mod_timer(&mp->timer, jiffies); 1632 } 1633 goto out; 1634 } 1635 1636 if (timer_pending(&other_query->timer)) 1637 goto out; 1638 1639 if (br->multicast_querier) { 1640 __br_multicast_send_query(br, port, &mp->addr); 1641 1642 time = jiffies + br->multicast_last_member_count * 1643 br->multicast_last_member_interval; 1644 1645 mod_timer(&own_query->timer, time); 1646 1647 for (p = mlock_dereference(mp->ports, br); 1648 p != NULL; 1649 p = mlock_dereference(p->next, br)) { 1650 if (!br_port_group_equal(p, port, src)) 1651 continue; 1652 1653 if (!hlist_unhashed(&p->mglist) && 1654 (timer_pending(&p->timer) ? 1655 time_after(p->timer.expires, time) : 1656 try_to_del_timer_sync(&p->timer) >= 0)) { 1657 mod_timer(&p->timer, time); 1658 } 1659 1660 break; 1661 } 1662 } 1663 1664 now = jiffies; 1665 time = now + br->multicast_last_member_count * 1666 br->multicast_last_member_interval; 1667 1668 if (!port) { 1669 if (mp->host_joined && 1670 (timer_pending(&mp->timer) ? 1671 time_after(mp->timer.expires, time) : 1672 try_to_del_timer_sync(&mp->timer) >= 0)) { 1673 mod_timer(&mp->timer, time); 1674 } 1675 1676 goto out; 1677 } 1678 1679 for (p = mlock_dereference(mp->ports, br); 1680 p != NULL; 1681 p = mlock_dereference(p->next, br)) { 1682 if (p->port != port) 1683 continue; 1684 1685 if (!hlist_unhashed(&p->mglist) && 1686 (timer_pending(&p->timer) ? 1687 time_after(p->timer.expires, time) : 1688 try_to_del_timer_sync(&p->timer) >= 0)) { 1689 mod_timer(&p->timer, time); 1690 } 1691 1692 break; 1693 } 1694 out: 1695 spin_unlock(&br->multicast_lock); 1696 } 1697 1698 static void br_ip4_multicast_leave_group(struct net_bridge *br, 1699 struct net_bridge_port *port, 1700 __be32 group, 1701 __u16 vid, 1702 const unsigned char *src) 1703 { 1704 struct br_ip br_group; 1705 struct bridge_mcast_own_query *own_query; 1706 1707 if (ipv4_is_local_multicast(group)) 1708 return; 1709 1710 own_query = port ? &port->ip4_own_query : &br->ip4_own_query; 1711 1712 br_group.u.ip4 = group; 1713 br_group.proto = htons(ETH_P_IP); 1714 br_group.vid = vid; 1715 1716 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query, 1717 own_query, src); 1718 } 1719 1720 #if IS_ENABLED(CONFIG_IPV6) 1721 static void br_ip6_multicast_leave_group(struct net_bridge *br, 1722 struct net_bridge_port *port, 1723 const struct in6_addr *group, 1724 __u16 vid, 1725 const unsigned char *src) 1726 { 1727 struct br_ip br_group; 1728 struct bridge_mcast_own_query *own_query; 1729 1730 if (ipv6_addr_is_ll_all_nodes(group)) 1731 return; 1732 1733 own_query = port ? &port->ip6_own_query : &br->ip6_own_query; 1734 1735 br_group.u.ip6 = *group; 1736 br_group.proto = htons(ETH_P_IPV6); 1737 br_group.vid = vid; 1738 1739 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query, 1740 own_query, src); 1741 } 1742 #endif 1743 1744 static void br_multicast_err_count(const struct net_bridge *br, 1745 const struct net_bridge_port *p, 1746 __be16 proto) 1747 { 1748 struct bridge_mcast_stats __percpu *stats; 1749 struct bridge_mcast_stats *pstats; 1750 1751 if (!br->multicast_stats_enabled) 1752 return; 1753 1754 if (p) 1755 stats = p->mcast_stats; 1756 else 1757 stats = br->mcast_stats; 1758 if (WARN_ON(!stats)) 1759 return; 1760 1761 pstats = this_cpu_ptr(stats); 1762 1763 u64_stats_update_begin(&pstats->syncp); 1764 switch (proto) { 1765 case htons(ETH_P_IP): 1766 pstats->mstats.igmp_parse_errors++; 1767 break; 1768 #if IS_ENABLED(CONFIG_IPV6) 1769 case htons(ETH_P_IPV6): 1770 pstats->mstats.mld_parse_errors++; 1771 break; 1772 #endif 1773 } 1774 u64_stats_update_end(&pstats->syncp); 1775 } 1776 1777 static void br_multicast_pim(struct net_bridge *br, 1778 struct net_bridge_port *port, 1779 const struct sk_buff *skb) 1780 { 1781 unsigned int offset = skb_transport_offset(skb); 1782 struct pimhdr *pimhdr, _pimhdr; 1783 1784 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr); 1785 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION || 1786 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO) 1787 return; 1788 1789 br_multicast_mark_router(br, port); 1790 } 1791 1792 static int br_multicast_ipv4_rcv(struct net_bridge *br, 1793 struct net_bridge_port *port, 1794 struct sk_buff *skb, 1795 u16 vid) 1796 { 1797 struct sk_buff *skb_trimmed = NULL; 1798 const unsigned char *src; 1799 struct igmphdr *ih; 1800 int err; 1801 1802 err = ip_mc_check_igmp(skb, &skb_trimmed); 1803 1804 if (err == -ENOMSG) { 1805 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) { 1806 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1807 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) { 1808 if (ip_hdr(skb)->protocol == IPPROTO_PIM) 1809 br_multicast_pim(br, port, skb); 1810 } 1811 return 0; 1812 } else if (err < 0) { 1813 br_multicast_err_count(br, port, skb->protocol); 1814 return err; 1815 } 1816 1817 ih = igmp_hdr(skb); 1818 src = eth_hdr(skb)->h_source; 1819 BR_INPUT_SKB_CB(skb)->igmp = ih->type; 1820 1821 switch (ih->type) { 1822 case IGMP_HOST_MEMBERSHIP_REPORT: 1823 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1824 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1825 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src); 1826 break; 1827 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1828 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid); 1829 break; 1830 case IGMP_HOST_MEMBERSHIP_QUERY: 1831 err = br_ip4_multicast_query(br, port, skb_trimmed, vid); 1832 break; 1833 case IGMP_HOST_LEAVE_MESSAGE: 1834 br_ip4_multicast_leave_group(br, port, ih->group, vid, src); 1835 break; 1836 } 1837 1838 if (skb_trimmed && skb_trimmed != skb) 1839 kfree_skb(skb_trimmed); 1840 1841 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp, 1842 BR_MCAST_DIR_RX); 1843 1844 return err; 1845 } 1846 1847 #if IS_ENABLED(CONFIG_IPV6) 1848 static int br_multicast_ipv6_rcv(struct net_bridge *br, 1849 struct net_bridge_port *port, 1850 struct sk_buff *skb, 1851 u16 vid) 1852 { 1853 struct sk_buff *skb_trimmed = NULL; 1854 const unsigned char *src; 1855 struct mld_msg *mld; 1856 int err; 1857 1858 err = ipv6_mc_check_mld(skb, &skb_trimmed); 1859 1860 if (err == -ENOMSG) { 1861 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr)) 1862 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1863 return 0; 1864 } else if (err < 0) { 1865 br_multicast_err_count(br, port, skb->protocol); 1866 return err; 1867 } 1868 1869 mld = (struct mld_msg *)skb_transport_header(skb); 1870 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type; 1871 1872 switch (mld->mld_type) { 1873 case ICMPV6_MGM_REPORT: 1874 src = eth_hdr(skb)->h_source; 1875 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1876 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid, 1877 src); 1878 break; 1879 case ICMPV6_MLD2_REPORT: 1880 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid); 1881 break; 1882 case ICMPV6_MGM_QUERY: 1883 err = br_ip6_multicast_query(br, port, skb_trimmed, vid); 1884 break; 1885 case ICMPV6_MGM_REDUCTION: 1886 src = eth_hdr(skb)->h_source; 1887 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src); 1888 break; 1889 } 1890 1891 if (skb_trimmed && skb_trimmed != skb) 1892 kfree_skb(skb_trimmed); 1893 1894 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp, 1895 BR_MCAST_DIR_RX); 1896 1897 return err; 1898 } 1899 #endif 1900 1901 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 1902 struct sk_buff *skb, u16 vid) 1903 { 1904 int ret = 0; 1905 1906 BR_INPUT_SKB_CB(skb)->igmp = 0; 1907 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 1908 1909 if (br->multicast_disabled) 1910 return 0; 1911 1912 switch (skb->protocol) { 1913 case htons(ETH_P_IP): 1914 ret = br_multicast_ipv4_rcv(br, port, skb, vid); 1915 break; 1916 #if IS_ENABLED(CONFIG_IPV6) 1917 case htons(ETH_P_IPV6): 1918 ret = br_multicast_ipv6_rcv(br, port, skb, vid); 1919 break; 1920 #endif 1921 } 1922 1923 return ret; 1924 } 1925 1926 static void br_multicast_query_expired(struct net_bridge *br, 1927 struct bridge_mcast_own_query *query, 1928 struct bridge_mcast_querier *querier) 1929 { 1930 spin_lock(&br->multicast_lock); 1931 if (query->startup_sent < br->multicast_startup_query_count) 1932 query->startup_sent++; 1933 1934 RCU_INIT_POINTER(querier->port, NULL); 1935 br_multicast_send_query(br, NULL, query); 1936 spin_unlock(&br->multicast_lock); 1937 } 1938 1939 static void br_ip4_multicast_query_expired(struct timer_list *t) 1940 { 1941 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer); 1942 1943 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier); 1944 } 1945 1946 #if IS_ENABLED(CONFIG_IPV6) 1947 static void br_ip6_multicast_query_expired(struct timer_list *t) 1948 { 1949 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer); 1950 1951 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier); 1952 } 1953 #endif 1954 1955 void br_multicast_init(struct net_bridge *br) 1956 { 1957 br->hash_elasticity = 4; 1958 br->hash_max = 512; 1959 1960 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1961 br->multicast_querier = 0; 1962 br->multicast_query_use_ifaddr = 0; 1963 br->multicast_last_member_count = 2; 1964 br->multicast_startup_query_count = 2; 1965 1966 br->multicast_last_member_interval = HZ; 1967 br->multicast_query_response_interval = 10 * HZ; 1968 br->multicast_startup_query_interval = 125 * HZ / 4; 1969 br->multicast_query_interval = 125 * HZ; 1970 br->multicast_querier_interval = 255 * HZ; 1971 br->multicast_membership_interval = 260 * HZ; 1972 1973 br->ip4_other_query.delay_time = 0; 1974 br->ip4_querier.port = NULL; 1975 br->multicast_igmp_version = 2; 1976 #if IS_ENABLED(CONFIG_IPV6) 1977 br->multicast_mld_version = 1; 1978 br->ip6_other_query.delay_time = 0; 1979 br->ip6_querier.port = NULL; 1980 #endif 1981 br->has_ipv6_addr = 1; 1982 1983 spin_lock_init(&br->multicast_lock); 1984 timer_setup(&br->multicast_router_timer, 1985 br_multicast_local_router_expired, 0); 1986 timer_setup(&br->ip4_other_query.timer, 1987 br_ip4_multicast_querier_expired, 0); 1988 timer_setup(&br->ip4_own_query.timer, 1989 br_ip4_multicast_query_expired, 0); 1990 #if IS_ENABLED(CONFIG_IPV6) 1991 timer_setup(&br->ip6_other_query.timer, 1992 br_ip6_multicast_querier_expired, 0); 1993 timer_setup(&br->ip6_own_query.timer, 1994 br_ip6_multicast_query_expired, 0); 1995 #endif 1996 } 1997 1998 static void __br_multicast_open(struct net_bridge *br, 1999 struct bridge_mcast_own_query *query) 2000 { 2001 query->startup_sent = 0; 2002 2003 if (br->multicast_disabled) 2004 return; 2005 2006 mod_timer(&query->timer, jiffies); 2007 } 2008 2009 void br_multicast_open(struct net_bridge *br) 2010 { 2011 __br_multicast_open(br, &br->ip4_own_query); 2012 #if IS_ENABLED(CONFIG_IPV6) 2013 __br_multicast_open(br, &br->ip6_own_query); 2014 #endif 2015 } 2016 2017 void br_multicast_stop(struct net_bridge *br) 2018 { 2019 del_timer_sync(&br->multicast_router_timer); 2020 del_timer_sync(&br->ip4_other_query.timer); 2021 del_timer_sync(&br->ip4_own_query.timer); 2022 #if IS_ENABLED(CONFIG_IPV6) 2023 del_timer_sync(&br->ip6_other_query.timer); 2024 del_timer_sync(&br->ip6_own_query.timer); 2025 #endif 2026 } 2027 2028 void br_multicast_dev_del(struct net_bridge *br) 2029 { 2030 struct net_bridge_mdb_htable *mdb; 2031 struct net_bridge_mdb_entry *mp; 2032 struct hlist_node *n; 2033 u32 ver; 2034 int i; 2035 2036 spin_lock_bh(&br->multicast_lock); 2037 mdb = mlock_dereference(br->mdb, br); 2038 if (!mdb) 2039 goto out; 2040 2041 br->mdb = NULL; 2042 2043 ver = mdb->ver; 2044 for (i = 0; i < mdb->max; i++) { 2045 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i], 2046 hlist[ver]) { 2047 del_timer(&mp->timer); 2048 call_rcu_bh(&mp->rcu, br_multicast_free_group); 2049 } 2050 } 2051 2052 if (mdb->old) { 2053 spin_unlock_bh(&br->multicast_lock); 2054 rcu_barrier_bh(); 2055 spin_lock_bh(&br->multicast_lock); 2056 WARN_ON(mdb->old); 2057 } 2058 2059 mdb->old = mdb; 2060 call_rcu_bh(&mdb->rcu, br_mdb_free); 2061 2062 out: 2063 spin_unlock_bh(&br->multicast_lock); 2064 } 2065 2066 int br_multicast_set_router(struct net_bridge *br, unsigned long val) 2067 { 2068 int err = -EINVAL; 2069 2070 spin_lock_bh(&br->multicast_lock); 2071 2072 switch (val) { 2073 case MDB_RTR_TYPE_DISABLED: 2074 case MDB_RTR_TYPE_PERM: 2075 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM); 2076 del_timer(&br->multicast_router_timer); 2077 br->multicast_router = val; 2078 err = 0; 2079 break; 2080 case MDB_RTR_TYPE_TEMP_QUERY: 2081 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY) 2082 br_mc_router_state_change(br, false); 2083 br->multicast_router = val; 2084 err = 0; 2085 break; 2086 } 2087 2088 spin_unlock_bh(&br->multicast_lock); 2089 2090 return err; 2091 } 2092 2093 static void __del_port_router(struct net_bridge_port *p) 2094 { 2095 if (hlist_unhashed(&p->rlist)) 2096 return; 2097 hlist_del_init_rcu(&p->rlist); 2098 br_rtr_notify(p->br->dev, p, RTM_DELMDB); 2099 br_port_mc_router_state_change(p, false); 2100 2101 /* don't allow timer refresh */ 2102 if (p->multicast_router == MDB_RTR_TYPE_TEMP) 2103 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 2104 } 2105 2106 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) 2107 { 2108 struct net_bridge *br = p->br; 2109 unsigned long now = jiffies; 2110 int err = -EINVAL; 2111 2112 spin_lock(&br->multicast_lock); 2113 if (p->multicast_router == val) { 2114 /* Refresh the temp router port timer */ 2115 if (p->multicast_router == MDB_RTR_TYPE_TEMP) 2116 mod_timer(&p->multicast_router_timer, 2117 now + br->multicast_querier_interval); 2118 err = 0; 2119 goto unlock; 2120 } 2121 switch (val) { 2122 case MDB_RTR_TYPE_DISABLED: 2123 p->multicast_router = MDB_RTR_TYPE_DISABLED; 2124 __del_port_router(p); 2125 del_timer(&p->multicast_router_timer); 2126 break; 2127 case MDB_RTR_TYPE_TEMP_QUERY: 2128 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 2129 __del_port_router(p); 2130 break; 2131 case MDB_RTR_TYPE_PERM: 2132 p->multicast_router = MDB_RTR_TYPE_PERM; 2133 del_timer(&p->multicast_router_timer); 2134 br_multicast_add_router(br, p); 2135 break; 2136 case MDB_RTR_TYPE_TEMP: 2137 p->multicast_router = MDB_RTR_TYPE_TEMP; 2138 br_multicast_mark_router(br, p); 2139 break; 2140 default: 2141 goto unlock; 2142 } 2143 err = 0; 2144 unlock: 2145 spin_unlock(&br->multicast_lock); 2146 2147 return err; 2148 } 2149 2150 static void br_multicast_start_querier(struct net_bridge *br, 2151 struct bridge_mcast_own_query *query) 2152 { 2153 struct net_bridge_port *port; 2154 2155 __br_multicast_open(br, query); 2156 2157 list_for_each_entry(port, &br->port_list, list) { 2158 if (port->state == BR_STATE_DISABLED || 2159 port->state == BR_STATE_BLOCKING) 2160 continue; 2161 2162 if (query == &br->ip4_own_query) 2163 br_multicast_enable(&port->ip4_own_query); 2164 #if IS_ENABLED(CONFIG_IPV6) 2165 else 2166 br_multicast_enable(&port->ip6_own_query); 2167 #endif 2168 } 2169 } 2170 2171 int br_multicast_toggle(struct net_bridge *br, unsigned long val) 2172 { 2173 struct net_bridge_mdb_htable *mdb; 2174 struct net_bridge_port *port; 2175 int err = 0; 2176 2177 spin_lock_bh(&br->multicast_lock); 2178 if (br->multicast_disabled == !val) 2179 goto unlock; 2180 2181 br_mc_disabled_update(br->dev, !val); 2182 br->multicast_disabled = !val; 2183 if (br->multicast_disabled) 2184 goto unlock; 2185 2186 if (!netif_running(br->dev)) 2187 goto unlock; 2188 2189 mdb = mlock_dereference(br->mdb, br); 2190 if (mdb) { 2191 if (mdb->old) { 2192 err = -EEXIST; 2193 rollback: 2194 br->multicast_disabled = !!val; 2195 goto unlock; 2196 } 2197 2198 err = br_mdb_rehash(&br->mdb, mdb->max, 2199 br->hash_elasticity); 2200 if (err) 2201 goto rollback; 2202 } 2203 2204 br_multicast_open(br); 2205 list_for_each_entry(port, &br->port_list, list) 2206 __br_multicast_enable_port(port); 2207 2208 unlock: 2209 spin_unlock_bh(&br->multicast_lock); 2210 2211 return err; 2212 } 2213 2214 bool br_multicast_enabled(const struct net_device *dev) 2215 { 2216 struct net_bridge *br = netdev_priv(dev); 2217 2218 return !br->multicast_disabled; 2219 } 2220 EXPORT_SYMBOL_GPL(br_multicast_enabled); 2221 2222 bool br_multicast_router(const struct net_device *dev) 2223 { 2224 struct net_bridge *br = netdev_priv(dev); 2225 bool is_router; 2226 2227 spin_lock_bh(&br->multicast_lock); 2228 is_router = br_multicast_is_router(br); 2229 spin_unlock_bh(&br->multicast_lock); 2230 return is_router; 2231 } 2232 EXPORT_SYMBOL_GPL(br_multicast_router); 2233 2234 int br_multicast_set_querier(struct net_bridge *br, unsigned long val) 2235 { 2236 unsigned long max_delay; 2237 2238 val = !!val; 2239 2240 spin_lock_bh(&br->multicast_lock); 2241 if (br->multicast_querier == val) 2242 goto unlock; 2243 2244 br->multicast_querier = val; 2245 if (!val) 2246 goto unlock; 2247 2248 max_delay = br->multicast_query_response_interval; 2249 2250 if (!timer_pending(&br->ip4_other_query.timer)) 2251 br->ip4_other_query.delay_time = jiffies + max_delay; 2252 2253 br_multicast_start_querier(br, &br->ip4_own_query); 2254 2255 #if IS_ENABLED(CONFIG_IPV6) 2256 if (!timer_pending(&br->ip6_other_query.timer)) 2257 br->ip6_other_query.delay_time = jiffies + max_delay; 2258 2259 br_multicast_start_querier(br, &br->ip6_own_query); 2260 #endif 2261 2262 unlock: 2263 spin_unlock_bh(&br->multicast_lock); 2264 2265 return 0; 2266 } 2267 2268 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) 2269 { 2270 int err = -EINVAL; 2271 u32 old; 2272 struct net_bridge_mdb_htable *mdb; 2273 2274 spin_lock_bh(&br->multicast_lock); 2275 if (!is_power_of_2(val)) 2276 goto unlock; 2277 2278 mdb = mlock_dereference(br->mdb, br); 2279 if (mdb && val < mdb->size) 2280 goto unlock; 2281 2282 err = 0; 2283 2284 old = br->hash_max; 2285 br->hash_max = val; 2286 2287 if (mdb) { 2288 if (mdb->old) { 2289 err = -EEXIST; 2290 rollback: 2291 br->hash_max = old; 2292 goto unlock; 2293 } 2294 2295 err = br_mdb_rehash(&br->mdb, br->hash_max, 2296 br->hash_elasticity); 2297 if (err) 2298 goto rollback; 2299 } 2300 2301 unlock: 2302 spin_unlock_bh(&br->multicast_lock); 2303 2304 return err; 2305 } 2306 2307 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val) 2308 { 2309 /* Currently we support only version 2 and 3 */ 2310 switch (val) { 2311 case 2: 2312 case 3: 2313 break; 2314 default: 2315 return -EINVAL; 2316 } 2317 2318 spin_lock_bh(&br->multicast_lock); 2319 br->multicast_igmp_version = val; 2320 spin_unlock_bh(&br->multicast_lock); 2321 2322 return 0; 2323 } 2324 2325 #if IS_ENABLED(CONFIG_IPV6) 2326 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val) 2327 { 2328 /* Currently we support version 1 and 2 */ 2329 switch (val) { 2330 case 1: 2331 case 2: 2332 break; 2333 default: 2334 return -EINVAL; 2335 } 2336 2337 spin_lock_bh(&br->multicast_lock); 2338 br->multicast_mld_version = val; 2339 spin_unlock_bh(&br->multicast_lock); 2340 2341 return 0; 2342 } 2343 #endif 2344 2345 /** 2346 * br_multicast_list_adjacent - Returns snooped multicast addresses 2347 * @dev: The bridge port adjacent to which to retrieve addresses 2348 * @br_ip_list: The list to store found, snooped multicast IP addresses in 2349 * 2350 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast 2351 * snooping feature on all bridge ports of dev's bridge device, excluding 2352 * the addresses from dev itself. 2353 * 2354 * Returns the number of items added to br_ip_list. 2355 * 2356 * Notes: 2357 * - br_ip_list needs to be initialized by caller 2358 * - br_ip_list might contain duplicates in the end 2359 * (needs to be taken care of by caller) 2360 * - br_ip_list needs to be freed by caller 2361 */ 2362 int br_multicast_list_adjacent(struct net_device *dev, 2363 struct list_head *br_ip_list) 2364 { 2365 struct net_bridge *br; 2366 struct net_bridge_port *port; 2367 struct net_bridge_port_group *group; 2368 struct br_ip_list *entry; 2369 int count = 0; 2370 2371 rcu_read_lock(); 2372 if (!br_ip_list || !br_port_exists(dev)) 2373 goto unlock; 2374 2375 port = br_port_get_rcu(dev); 2376 if (!port || !port->br) 2377 goto unlock; 2378 2379 br = port->br; 2380 2381 list_for_each_entry_rcu(port, &br->port_list, list) { 2382 if (!port->dev || port->dev == dev) 2383 continue; 2384 2385 hlist_for_each_entry_rcu(group, &port->mglist, mglist) { 2386 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 2387 if (!entry) 2388 goto unlock; 2389 2390 entry->addr = group->addr; 2391 list_add(&entry->list, br_ip_list); 2392 count++; 2393 } 2394 } 2395 2396 unlock: 2397 rcu_read_unlock(); 2398 return count; 2399 } 2400 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); 2401 2402 /** 2403 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge 2404 * @dev: The bridge port providing the bridge on which to check for a querier 2405 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 2406 * 2407 * Checks whether the given interface has a bridge on top and if so returns 2408 * true if a valid querier exists anywhere on the bridged link layer. 2409 * Otherwise returns false. 2410 */ 2411 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto) 2412 { 2413 struct net_bridge *br; 2414 struct net_bridge_port *port; 2415 struct ethhdr eth; 2416 bool ret = false; 2417 2418 rcu_read_lock(); 2419 if (!br_port_exists(dev)) 2420 goto unlock; 2421 2422 port = br_port_get_rcu(dev); 2423 if (!port || !port->br) 2424 goto unlock; 2425 2426 br = port->br; 2427 2428 memset(ð, 0, sizeof(eth)); 2429 eth.h_proto = htons(proto); 2430 2431 ret = br_multicast_querier_exists(br, ð); 2432 2433 unlock: 2434 rcu_read_unlock(); 2435 return ret; 2436 } 2437 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere); 2438 2439 /** 2440 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port 2441 * @dev: The bridge port adjacent to which to check for a querier 2442 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 2443 * 2444 * Checks whether the given interface has a bridge on top and if so returns 2445 * true if a selected querier is behind one of the other ports of this 2446 * bridge. Otherwise returns false. 2447 */ 2448 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) 2449 { 2450 struct net_bridge *br; 2451 struct net_bridge_port *port; 2452 bool ret = false; 2453 2454 rcu_read_lock(); 2455 if (!br_port_exists(dev)) 2456 goto unlock; 2457 2458 port = br_port_get_rcu(dev); 2459 if (!port || !port->br) 2460 goto unlock; 2461 2462 br = port->br; 2463 2464 switch (proto) { 2465 case ETH_P_IP: 2466 if (!timer_pending(&br->ip4_other_query.timer) || 2467 rcu_dereference(br->ip4_querier.port) == port) 2468 goto unlock; 2469 break; 2470 #if IS_ENABLED(CONFIG_IPV6) 2471 case ETH_P_IPV6: 2472 if (!timer_pending(&br->ip6_other_query.timer) || 2473 rcu_dereference(br->ip6_querier.port) == port) 2474 goto unlock; 2475 break; 2476 #endif 2477 default: 2478 goto unlock; 2479 } 2480 2481 ret = true; 2482 unlock: 2483 rcu_read_unlock(); 2484 return ret; 2485 } 2486 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); 2487 2488 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats, 2489 const struct sk_buff *skb, u8 type, u8 dir) 2490 { 2491 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats); 2492 __be16 proto = skb->protocol; 2493 unsigned int t_len; 2494 2495 u64_stats_update_begin(&pstats->syncp); 2496 switch (proto) { 2497 case htons(ETH_P_IP): 2498 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); 2499 switch (type) { 2500 case IGMP_HOST_MEMBERSHIP_REPORT: 2501 pstats->mstats.igmp_v1reports[dir]++; 2502 break; 2503 case IGMPV2_HOST_MEMBERSHIP_REPORT: 2504 pstats->mstats.igmp_v2reports[dir]++; 2505 break; 2506 case IGMPV3_HOST_MEMBERSHIP_REPORT: 2507 pstats->mstats.igmp_v3reports[dir]++; 2508 break; 2509 case IGMP_HOST_MEMBERSHIP_QUERY: 2510 if (t_len != sizeof(struct igmphdr)) { 2511 pstats->mstats.igmp_v3queries[dir]++; 2512 } else { 2513 unsigned int offset = skb_transport_offset(skb); 2514 struct igmphdr *ih, _ihdr; 2515 2516 ih = skb_header_pointer(skb, offset, 2517 sizeof(_ihdr), &_ihdr); 2518 if (!ih) 2519 break; 2520 if (!ih->code) 2521 pstats->mstats.igmp_v1queries[dir]++; 2522 else 2523 pstats->mstats.igmp_v2queries[dir]++; 2524 } 2525 break; 2526 case IGMP_HOST_LEAVE_MESSAGE: 2527 pstats->mstats.igmp_leaves[dir]++; 2528 break; 2529 } 2530 break; 2531 #if IS_ENABLED(CONFIG_IPV6) 2532 case htons(ETH_P_IPV6): 2533 t_len = ntohs(ipv6_hdr(skb)->payload_len) + 2534 sizeof(struct ipv6hdr); 2535 t_len -= skb_network_header_len(skb); 2536 switch (type) { 2537 case ICMPV6_MGM_REPORT: 2538 pstats->mstats.mld_v1reports[dir]++; 2539 break; 2540 case ICMPV6_MLD2_REPORT: 2541 pstats->mstats.mld_v2reports[dir]++; 2542 break; 2543 case ICMPV6_MGM_QUERY: 2544 if (t_len != sizeof(struct mld_msg)) 2545 pstats->mstats.mld_v2queries[dir]++; 2546 else 2547 pstats->mstats.mld_v1queries[dir]++; 2548 break; 2549 case ICMPV6_MGM_REDUCTION: 2550 pstats->mstats.mld_leaves[dir]++; 2551 break; 2552 } 2553 break; 2554 #endif /* CONFIG_IPV6 */ 2555 } 2556 u64_stats_update_end(&pstats->syncp); 2557 } 2558 2559 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 2560 const struct sk_buff *skb, u8 type, u8 dir) 2561 { 2562 struct bridge_mcast_stats __percpu *stats; 2563 2564 /* if multicast_disabled is true then igmp type can't be set */ 2565 if (!type || !br->multicast_stats_enabled) 2566 return; 2567 2568 if (p) 2569 stats = p->mcast_stats; 2570 else 2571 stats = br->mcast_stats; 2572 if (WARN_ON(!stats)) 2573 return; 2574 2575 br_mcast_stats_add(stats, skb, type, dir); 2576 } 2577 2578 int br_multicast_init_stats(struct net_bridge *br) 2579 { 2580 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 2581 if (!br->mcast_stats) 2582 return -ENOMEM; 2583 2584 return 0; 2585 } 2586 2587 void br_multicast_uninit_stats(struct net_bridge *br) 2588 { 2589 free_percpu(br->mcast_stats); 2590 } 2591 2592 static void mcast_stats_add_dir(u64 *dst, u64 *src) 2593 { 2594 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX]; 2595 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX]; 2596 } 2597 2598 void br_multicast_get_stats(const struct net_bridge *br, 2599 const struct net_bridge_port *p, 2600 struct br_mcast_stats *dest) 2601 { 2602 struct bridge_mcast_stats __percpu *stats; 2603 struct br_mcast_stats tdst; 2604 int i; 2605 2606 memset(dest, 0, sizeof(*dest)); 2607 if (p) 2608 stats = p->mcast_stats; 2609 else 2610 stats = br->mcast_stats; 2611 if (WARN_ON(!stats)) 2612 return; 2613 2614 memset(&tdst, 0, sizeof(tdst)); 2615 for_each_possible_cpu(i) { 2616 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i); 2617 struct br_mcast_stats temp; 2618 unsigned int start; 2619 2620 do { 2621 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); 2622 memcpy(&temp, &cpu_stats->mstats, sizeof(temp)); 2623 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); 2624 2625 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries); 2626 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries); 2627 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries); 2628 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves); 2629 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports); 2630 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports); 2631 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports); 2632 tdst.igmp_parse_errors += temp.igmp_parse_errors; 2633 2634 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries); 2635 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries); 2636 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves); 2637 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports); 2638 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports); 2639 tdst.mld_parse_errors += temp.mld_parse_errors; 2640 } 2641 memcpy(dest, &tdst, sizeof(*dest)); 2642 } 2643