1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Bridge multicast support. 4 * 5 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> 6 */ 7 8 #include <linux/err.h> 9 #include <linux/export.h> 10 #include <linux/if_ether.h> 11 #include <linux/igmp.h> 12 #include <linux/in.h> 13 #include <linux/jhash.h> 14 #include <linux/kernel.h> 15 #include <linux/log2.h> 16 #include <linux/netdevice.h> 17 #include <linux/netfilter_bridge.h> 18 #include <linux/random.h> 19 #include <linux/rculist.h> 20 #include <linux/skbuff.h> 21 #include <linux/slab.h> 22 #include <linux/timer.h> 23 #include <linux/inetdevice.h> 24 #include <linux/mroute.h> 25 #include <net/ip.h> 26 #include <net/switchdev.h> 27 #if IS_ENABLED(CONFIG_IPV6) 28 #include <linux/icmpv6.h> 29 #include <net/ipv6.h> 30 #include <net/mld.h> 31 #include <net/ip6_checksum.h> 32 #include <net/addrconf.h> 33 #endif 34 35 #include "br_private.h" 36 37 static const struct rhashtable_params br_mdb_rht_params = { 38 .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode), 39 .key_offset = offsetof(struct net_bridge_mdb_entry, addr), 40 .key_len = sizeof(struct br_ip), 41 .automatic_shrinking = true, 42 }; 43 44 static void br_multicast_start_querier(struct net_bridge *br, 45 struct bridge_mcast_own_query *query); 46 static void br_multicast_add_router(struct net_bridge *br, 47 struct net_bridge_port *port); 48 static void br_ip4_multicast_leave_group(struct net_bridge *br, 49 struct net_bridge_port *port, 50 __be32 group, 51 __u16 vid, 52 const unsigned char *src); 53 54 static void __del_port_router(struct net_bridge_port *p); 55 #if IS_ENABLED(CONFIG_IPV6) 56 static void br_ip6_multicast_leave_group(struct net_bridge *br, 57 struct net_bridge_port *port, 58 const struct in6_addr *group, 59 __u16 vid, const unsigned char *src); 60 #endif 61 62 static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br, 63 struct br_ip *dst) 64 { 65 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params); 66 } 67 68 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br, 69 struct br_ip *dst) 70 { 71 struct net_bridge_mdb_entry *ent; 72 73 lockdep_assert_held_once(&br->multicast_lock); 74 75 rcu_read_lock(); 76 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params); 77 rcu_read_unlock(); 78 79 return ent; 80 } 81 82 static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br, 83 __be32 dst, __u16 vid) 84 { 85 struct br_ip br_dst; 86 87 memset(&br_dst, 0, sizeof(br_dst)); 88 br_dst.u.ip4 = dst; 89 br_dst.proto = htons(ETH_P_IP); 90 br_dst.vid = vid; 91 92 return br_mdb_ip_get(br, &br_dst); 93 } 94 95 #if IS_ENABLED(CONFIG_IPV6) 96 static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br, 97 const struct in6_addr *dst, 98 __u16 vid) 99 { 100 struct br_ip br_dst; 101 102 memset(&br_dst, 0, sizeof(br_dst)); 103 br_dst.u.ip6 = *dst; 104 br_dst.proto = htons(ETH_P_IPV6); 105 br_dst.vid = vid; 106 107 return br_mdb_ip_get(br, &br_dst); 108 } 109 #endif 110 111 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 112 struct sk_buff *skb, u16 vid) 113 { 114 struct br_ip ip; 115 116 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 117 return NULL; 118 119 if (BR_INPUT_SKB_CB(skb)->igmp) 120 return NULL; 121 122 memset(&ip, 0, sizeof(ip)); 123 ip.proto = skb->protocol; 124 ip.vid = vid; 125 126 switch (skb->protocol) { 127 case htons(ETH_P_IP): 128 ip.u.ip4 = ip_hdr(skb)->daddr; 129 break; 130 #if IS_ENABLED(CONFIG_IPV6) 131 case htons(ETH_P_IPV6): 132 ip.u.ip6 = ipv6_hdr(skb)->daddr; 133 break; 134 #endif 135 default: 136 return NULL; 137 } 138 139 return br_mdb_ip_get_rcu(br, &ip); 140 } 141 142 static void br_multicast_group_expired(struct timer_list *t) 143 { 144 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer); 145 struct net_bridge *br = mp->br; 146 147 spin_lock(&br->multicast_lock); 148 if (!netif_running(br->dev) || timer_pending(&mp->timer)) 149 goto out; 150 151 mp->host_joined = false; 152 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0); 153 154 if (mp->ports) 155 goto out; 156 157 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode, 158 br_mdb_rht_params); 159 hlist_del_rcu(&mp->mdb_node); 160 161 kfree_rcu(mp, rcu); 162 163 out: 164 spin_unlock(&br->multicast_lock); 165 } 166 167 static void br_multicast_del_pg(struct net_bridge *br, 168 struct net_bridge_port_group *pg) 169 { 170 struct net_bridge_mdb_entry *mp; 171 struct net_bridge_port_group *p; 172 struct net_bridge_port_group __rcu **pp; 173 174 mp = br_mdb_ip_get(br, &pg->addr); 175 if (WARN_ON(!mp)) 176 return; 177 178 for (pp = &mp->ports; 179 (p = mlock_dereference(*pp, br)) != NULL; 180 pp = &p->next) { 181 if (p != pg) 182 continue; 183 184 rcu_assign_pointer(*pp, p->next); 185 hlist_del_init(&p->mglist); 186 del_timer(&p->timer); 187 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB, 188 p->flags); 189 kfree_rcu(p, rcu); 190 191 if (!mp->ports && !mp->host_joined && 192 netif_running(br->dev)) 193 mod_timer(&mp->timer, jiffies); 194 195 return; 196 } 197 198 WARN_ON(1); 199 } 200 201 static void br_multicast_port_group_expired(struct timer_list *t) 202 { 203 struct net_bridge_port_group *pg = from_timer(pg, t, timer); 204 struct net_bridge *br = pg->port->br; 205 206 spin_lock(&br->multicast_lock); 207 if (!netif_running(br->dev) || timer_pending(&pg->timer) || 208 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT) 209 goto out; 210 211 br_multicast_del_pg(br, pg); 212 213 out: 214 spin_unlock(&br->multicast_lock); 215 } 216 217 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, 218 __be32 group, 219 u8 *igmp_type) 220 { 221 struct igmpv3_query *ihv3; 222 size_t igmp_hdr_size; 223 struct sk_buff *skb; 224 struct igmphdr *ih; 225 struct ethhdr *eth; 226 struct iphdr *iph; 227 228 igmp_hdr_size = sizeof(*ih); 229 if (br->multicast_igmp_version == 3) 230 igmp_hdr_size = sizeof(*ihv3); 231 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + 232 igmp_hdr_size + 4); 233 if (!skb) 234 goto out; 235 236 skb->protocol = htons(ETH_P_IP); 237 238 skb_reset_mac_header(skb); 239 eth = eth_hdr(skb); 240 241 ether_addr_copy(eth->h_source, br->dev->dev_addr); 242 eth->h_dest[0] = 1; 243 eth->h_dest[1] = 0; 244 eth->h_dest[2] = 0x5e; 245 eth->h_dest[3] = 0; 246 eth->h_dest[4] = 0; 247 eth->h_dest[5] = 1; 248 eth->h_proto = htons(ETH_P_IP); 249 skb_put(skb, sizeof(*eth)); 250 251 skb_set_network_header(skb, skb->len); 252 iph = ip_hdr(skb); 253 254 iph->version = 4; 255 iph->ihl = 6; 256 iph->tos = 0xc0; 257 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4); 258 iph->id = 0; 259 iph->frag_off = htons(IP_DF); 260 iph->ttl = 1; 261 iph->protocol = IPPROTO_IGMP; 262 iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ? 263 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0; 264 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); 265 ((u8 *)&iph[1])[0] = IPOPT_RA; 266 ((u8 *)&iph[1])[1] = 4; 267 ((u8 *)&iph[1])[2] = 0; 268 ((u8 *)&iph[1])[3] = 0; 269 ip_send_check(iph); 270 skb_put(skb, 24); 271 272 skb_set_transport_header(skb, skb->len); 273 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY; 274 275 switch (br->multicast_igmp_version) { 276 case 2: 277 ih = igmp_hdr(skb); 278 ih->type = IGMP_HOST_MEMBERSHIP_QUERY; 279 ih->code = (group ? br->multicast_last_member_interval : 280 br->multicast_query_response_interval) / 281 (HZ / IGMP_TIMER_SCALE); 282 ih->group = group; 283 ih->csum = 0; 284 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih)); 285 break; 286 case 3: 287 ihv3 = igmpv3_query_hdr(skb); 288 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY; 289 ihv3->code = (group ? br->multicast_last_member_interval : 290 br->multicast_query_response_interval) / 291 (HZ / IGMP_TIMER_SCALE); 292 ihv3->group = group; 293 ihv3->qqic = br->multicast_query_interval / HZ; 294 ihv3->nsrcs = 0; 295 ihv3->resv = 0; 296 ihv3->suppress = 0; 297 ihv3->qrv = 2; 298 ihv3->csum = 0; 299 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3)); 300 break; 301 } 302 303 skb_put(skb, igmp_hdr_size); 304 __skb_pull(skb, sizeof(*eth)); 305 306 out: 307 return skb; 308 } 309 310 #if IS_ENABLED(CONFIG_IPV6) 311 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, 312 const struct in6_addr *grp, 313 u8 *igmp_type) 314 { 315 struct mld2_query *mld2q; 316 unsigned long interval; 317 struct ipv6hdr *ip6h; 318 struct mld_msg *mldq; 319 size_t mld_hdr_size; 320 struct sk_buff *skb; 321 struct ethhdr *eth; 322 u8 *hopopt; 323 324 mld_hdr_size = sizeof(*mldq); 325 if (br->multicast_mld_version == 2) 326 mld_hdr_size = sizeof(*mld2q); 327 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + 328 8 + mld_hdr_size); 329 if (!skb) 330 goto out; 331 332 skb->protocol = htons(ETH_P_IPV6); 333 334 /* Ethernet header */ 335 skb_reset_mac_header(skb); 336 eth = eth_hdr(skb); 337 338 ether_addr_copy(eth->h_source, br->dev->dev_addr); 339 eth->h_proto = htons(ETH_P_IPV6); 340 skb_put(skb, sizeof(*eth)); 341 342 /* IPv6 header + HbH option */ 343 skb_set_network_header(skb, skb->len); 344 ip6h = ipv6_hdr(skb); 345 346 *(__force __be32 *)ip6h = htonl(0x60000000); 347 ip6h->payload_len = htons(8 + mld_hdr_size); 348 ip6h->nexthdr = IPPROTO_HOPOPTS; 349 ip6h->hop_limit = 1; 350 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); 351 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, 352 &ip6h->saddr)) { 353 kfree_skb(skb); 354 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false); 355 return NULL; 356 } 357 358 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true); 359 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 360 361 hopopt = (u8 *)(ip6h + 1); 362 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */ 363 hopopt[1] = 0; /* length of HbH */ 364 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */ 365 hopopt[3] = 2; /* Length of RA Option */ 366 hopopt[4] = 0; /* Type = 0x0000 (MLD) */ 367 hopopt[5] = 0; 368 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */ 369 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */ 370 371 skb_put(skb, sizeof(*ip6h) + 8); 372 373 /* ICMPv6 */ 374 skb_set_transport_header(skb, skb->len); 375 interval = ipv6_addr_any(grp) ? 376 br->multicast_query_response_interval : 377 br->multicast_last_member_interval; 378 *igmp_type = ICMPV6_MGM_QUERY; 379 switch (br->multicast_mld_version) { 380 case 1: 381 mldq = (struct mld_msg *)icmp6_hdr(skb); 382 mldq->mld_type = ICMPV6_MGM_QUERY; 383 mldq->mld_code = 0; 384 mldq->mld_cksum = 0; 385 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); 386 mldq->mld_reserved = 0; 387 mldq->mld_mca = *grp; 388 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 389 sizeof(*mldq), IPPROTO_ICMPV6, 390 csum_partial(mldq, 391 sizeof(*mldq), 392 0)); 393 break; 394 case 2: 395 mld2q = (struct mld2_query *)icmp6_hdr(skb); 396 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval)); 397 mld2q->mld2q_type = ICMPV6_MGM_QUERY; 398 mld2q->mld2q_code = 0; 399 mld2q->mld2q_cksum = 0; 400 mld2q->mld2q_resv1 = 0; 401 mld2q->mld2q_resv2 = 0; 402 mld2q->mld2q_suppress = 0; 403 mld2q->mld2q_qrv = 2; 404 mld2q->mld2q_nsrcs = 0; 405 mld2q->mld2q_qqic = br->multicast_query_interval / HZ; 406 mld2q->mld2q_mca = *grp; 407 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 408 sizeof(*mld2q), 409 IPPROTO_ICMPV6, 410 csum_partial(mld2q, 411 sizeof(*mld2q), 412 0)); 413 break; 414 } 415 skb_put(skb, mld_hdr_size); 416 417 __skb_pull(skb, sizeof(*eth)); 418 419 out: 420 return skb; 421 } 422 #endif 423 424 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, 425 struct br_ip *addr, 426 u8 *igmp_type) 427 { 428 switch (addr->proto) { 429 case htons(ETH_P_IP): 430 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type); 431 #if IS_ENABLED(CONFIG_IPV6) 432 case htons(ETH_P_IPV6): 433 return br_ip6_multicast_alloc_query(br, &addr->u.ip6, 434 igmp_type); 435 #endif 436 } 437 return NULL; 438 } 439 440 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br, 441 struct br_ip *group) 442 { 443 struct net_bridge_mdb_entry *mp; 444 int err; 445 446 mp = br_mdb_ip_get(br, group); 447 if (mp) 448 return mp; 449 450 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) { 451 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false); 452 return ERR_PTR(-E2BIG); 453 } 454 455 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 456 if (unlikely(!mp)) 457 return ERR_PTR(-ENOMEM); 458 459 mp->br = br; 460 mp->addr = *group; 461 timer_setup(&mp->timer, br_multicast_group_expired, 0); 462 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode, 463 br_mdb_rht_params); 464 if (err) { 465 kfree(mp); 466 mp = ERR_PTR(err); 467 } else { 468 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list); 469 } 470 471 return mp; 472 } 473 474 struct net_bridge_port_group *br_multicast_new_port_group( 475 struct net_bridge_port *port, 476 struct br_ip *group, 477 struct net_bridge_port_group __rcu *next, 478 unsigned char flags, 479 const unsigned char *src) 480 { 481 struct net_bridge_port_group *p; 482 483 p = kzalloc(sizeof(*p), GFP_ATOMIC); 484 if (unlikely(!p)) 485 return NULL; 486 487 p->addr = *group; 488 p->port = port; 489 p->flags = flags; 490 rcu_assign_pointer(p->next, next); 491 hlist_add_head(&p->mglist, &port->mglist); 492 timer_setup(&p->timer, br_multicast_port_group_expired, 0); 493 494 if (src) 495 memcpy(p->eth_addr, src, ETH_ALEN); 496 else 497 eth_broadcast_addr(p->eth_addr); 498 499 return p; 500 } 501 502 static bool br_port_group_equal(struct net_bridge_port_group *p, 503 struct net_bridge_port *port, 504 const unsigned char *src) 505 { 506 if (p->port != port) 507 return false; 508 509 if (!(port->flags & BR_MULTICAST_TO_UNICAST)) 510 return true; 511 512 return ether_addr_equal(src, p->eth_addr); 513 } 514 515 static int br_multicast_add_group(struct net_bridge *br, 516 struct net_bridge_port *port, 517 struct br_ip *group, 518 const unsigned char *src) 519 { 520 struct net_bridge_port_group __rcu **pp; 521 struct net_bridge_port_group *p; 522 struct net_bridge_mdb_entry *mp; 523 unsigned long now = jiffies; 524 int err; 525 526 spin_lock(&br->multicast_lock); 527 if (!netif_running(br->dev) || 528 (port && port->state == BR_STATE_DISABLED)) 529 goto out; 530 531 mp = br_multicast_new_group(br, group); 532 err = PTR_ERR(mp); 533 if (IS_ERR(mp)) 534 goto err; 535 536 if (!port) { 537 if (!mp->host_joined) { 538 mp->host_joined = true; 539 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0); 540 } 541 mod_timer(&mp->timer, now + br->multicast_membership_interval); 542 goto out; 543 } 544 545 for (pp = &mp->ports; 546 (p = mlock_dereference(*pp, br)) != NULL; 547 pp = &p->next) { 548 if (br_port_group_equal(p, port, src)) 549 goto found; 550 if ((unsigned long)p->port < (unsigned long)port) 551 break; 552 } 553 554 p = br_multicast_new_port_group(port, group, *pp, 0, src); 555 if (unlikely(!p)) 556 goto err; 557 rcu_assign_pointer(*pp, p); 558 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0); 559 560 found: 561 mod_timer(&p->timer, now + br->multicast_membership_interval); 562 out: 563 err = 0; 564 565 err: 566 spin_unlock(&br->multicast_lock); 567 return err; 568 } 569 570 static int br_ip4_multicast_add_group(struct net_bridge *br, 571 struct net_bridge_port *port, 572 __be32 group, 573 __u16 vid, 574 const unsigned char *src) 575 { 576 struct br_ip br_group; 577 578 if (ipv4_is_local_multicast(group)) 579 return 0; 580 581 memset(&br_group, 0, sizeof(br_group)); 582 br_group.u.ip4 = group; 583 br_group.proto = htons(ETH_P_IP); 584 br_group.vid = vid; 585 586 return br_multicast_add_group(br, port, &br_group, src); 587 } 588 589 #if IS_ENABLED(CONFIG_IPV6) 590 static int br_ip6_multicast_add_group(struct net_bridge *br, 591 struct net_bridge_port *port, 592 const struct in6_addr *group, 593 __u16 vid, 594 const unsigned char *src) 595 { 596 struct br_ip br_group; 597 598 if (ipv6_addr_is_ll_all_nodes(group)) 599 return 0; 600 601 memset(&br_group, 0, sizeof(br_group)); 602 br_group.u.ip6 = *group; 603 br_group.proto = htons(ETH_P_IPV6); 604 br_group.vid = vid; 605 606 return br_multicast_add_group(br, port, &br_group, src); 607 } 608 #endif 609 610 static void br_multicast_router_expired(struct timer_list *t) 611 { 612 struct net_bridge_port *port = 613 from_timer(port, t, multicast_router_timer); 614 struct net_bridge *br = port->br; 615 616 spin_lock(&br->multicast_lock); 617 if (port->multicast_router == MDB_RTR_TYPE_DISABLED || 618 port->multicast_router == MDB_RTR_TYPE_PERM || 619 timer_pending(&port->multicast_router_timer)) 620 goto out; 621 622 __del_port_router(port); 623 out: 624 spin_unlock(&br->multicast_lock); 625 } 626 627 static void br_mc_router_state_change(struct net_bridge *p, 628 bool is_mc_router) 629 { 630 struct switchdev_attr attr = { 631 .orig_dev = p->dev, 632 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER, 633 .flags = SWITCHDEV_F_DEFER, 634 .u.mrouter = is_mc_router, 635 }; 636 637 switchdev_port_attr_set(p->dev, &attr); 638 } 639 640 static void br_multicast_local_router_expired(struct timer_list *t) 641 { 642 struct net_bridge *br = from_timer(br, t, multicast_router_timer); 643 644 spin_lock(&br->multicast_lock); 645 if (br->multicast_router == MDB_RTR_TYPE_DISABLED || 646 br->multicast_router == MDB_RTR_TYPE_PERM || 647 timer_pending(&br->multicast_router_timer)) 648 goto out; 649 650 br_mc_router_state_change(br, false); 651 out: 652 spin_unlock(&br->multicast_lock); 653 } 654 655 static void br_multicast_querier_expired(struct net_bridge *br, 656 struct bridge_mcast_own_query *query) 657 { 658 spin_lock(&br->multicast_lock); 659 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED)) 660 goto out; 661 662 br_multicast_start_querier(br, query); 663 664 out: 665 spin_unlock(&br->multicast_lock); 666 } 667 668 static void br_ip4_multicast_querier_expired(struct timer_list *t) 669 { 670 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer); 671 672 br_multicast_querier_expired(br, &br->ip4_own_query); 673 } 674 675 #if IS_ENABLED(CONFIG_IPV6) 676 static void br_ip6_multicast_querier_expired(struct timer_list *t) 677 { 678 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer); 679 680 br_multicast_querier_expired(br, &br->ip6_own_query); 681 } 682 #endif 683 684 static void br_multicast_select_own_querier(struct net_bridge *br, 685 struct br_ip *ip, 686 struct sk_buff *skb) 687 { 688 if (ip->proto == htons(ETH_P_IP)) 689 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr; 690 #if IS_ENABLED(CONFIG_IPV6) 691 else 692 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr; 693 #endif 694 } 695 696 static void __br_multicast_send_query(struct net_bridge *br, 697 struct net_bridge_port *port, 698 struct br_ip *ip) 699 { 700 struct sk_buff *skb; 701 u8 igmp_type; 702 703 skb = br_multicast_alloc_query(br, ip, &igmp_type); 704 if (!skb) 705 return; 706 707 if (port) { 708 skb->dev = port->dev; 709 br_multicast_count(br, port, skb, igmp_type, 710 BR_MCAST_DIR_TX); 711 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, 712 dev_net(port->dev), NULL, skb, NULL, skb->dev, 713 br_dev_queue_push_xmit); 714 } else { 715 br_multicast_select_own_querier(br, ip, skb); 716 br_multicast_count(br, port, skb, igmp_type, 717 BR_MCAST_DIR_RX); 718 netif_rx(skb); 719 } 720 } 721 722 static void br_multicast_send_query(struct net_bridge *br, 723 struct net_bridge_port *port, 724 struct bridge_mcast_own_query *own_query) 725 { 726 struct bridge_mcast_other_query *other_query = NULL; 727 struct br_ip br_group; 728 unsigned long time; 729 730 if (!netif_running(br->dev) || 731 !br_opt_get(br, BROPT_MULTICAST_ENABLED) || 732 !br_opt_get(br, BROPT_MULTICAST_QUERIER)) 733 return; 734 735 memset(&br_group.u, 0, sizeof(br_group.u)); 736 737 if (port ? (own_query == &port->ip4_own_query) : 738 (own_query == &br->ip4_own_query)) { 739 other_query = &br->ip4_other_query; 740 br_group.proto = htons(ETH_P_IP); 741 #if IS_ENABLED(CONFIG_IPV6) 742 } else { 743 other_query = &br->ip6_other_query; 744 br_group.proto = htons(ETH_P_IPV6); 745 #endif 746 } 747 748 if (!other_query || timer_pending(&other_query->timer)) 749 return; 750 751 __br_multicast_send_query(br, port, &br_group); 752 753 time = jiffies; 754 time += own_query->startup_sent < br->multicast_startup_query_count ? 755 br->multicast_startup_query_interval : 756 br->multicast_query_interval; 757 mod_timer(&own_query->timer, time); 758 } 759 760 static void 761 br_multicast_port_query_expired(struct net_bridge_port *port, 762 struct bridge_mcast_own_query *query) 763 { 764 struct net_bridge *br = port->br; 765 766 spin_lock(&br->multicast_lock); 767 if (port->state == BR_STATE_DISABLED || 768 port->state == BR_STATE_BLOCKING) 769 goto out; 770 771 if (query->startup_sent < br->multicast_startup_query_count) 772 query->startup_sent++; 773 774 br_multicast_send_query(port->br, port, query); 775 776 out: 777 spin_unlock(&br->multicast_lock); 778 } 779 780 static void br_ip4_multicast_port_query_expired(struct timer_list *t) 781 { 782 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer); 783 784 br_multicast_port_query_expired(port, &port->ip4_own_query); 785 } 786 787 #if IS_ENABLED(CONFIG_IPV6) 788 static void br_ip6_multicast_port_query_expired(struct timer_list *t) 789 { 790 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer); 791 792 br_multicast_port_query_expired(port, &port->ip6_own_query); 793 } 794 #endif 795 796 static void br_mc_disabled_update(struct net_device *dev, bool value) 797 { 798 struct switchdev_attr attr = { 799 .orig_dev = dev, 800 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED, 801 .flags = SWITCHDEV_F_DEFER, 802 .u.mc_disabled = !value, 803 }; 804 805 switchdev_port_attr_set(dev, &attr); 806 } 807 808 int br_multicast_add_port(struct net_bridge_port *port) 809 { 810 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 811 812 timer_setup(&port->multicast_router_timer, 813 br_multicast_router_expired, 0); 814 timer_setup(&port->ip4_own_query.timer, 815 br_ip4_multicast_port_query_expired, 0); 816 #if IS_ENABLED(CONFIG_IPV6) 817 timer_setup(&port->ip6_own_query.timer, 818 br_ip6_multicast_port_query_expired, 0); 819 #endif 820 br_mc_disabled_update(port->dev, 821 br_opt_get(port->br, BROPT_MULTICAST_ENABLED)); 822 823 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 824 if (!port->mcast_stats) 825 return -ENOMEM; 826 827 return 0; 828 } 829 830 void br_multicast_del_port(struct net_bridge_port *port) 831 { 832 struct net_bridge *br = port->br; 833 struct net_bridge_port_group *pg; 834 struct hlist_node *n; 835 836 /* Take care of the remaining groups, only perm ones should be left */ 837 spin_lock_bh(&br->multicast_lock); 838 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 839 br_multicast_del_pg(br, pg); 840 spin_unlock_bh(&br->multicast_lock); 841 del_timer_sync(&port->multicast_router_timer); 842 free_percpu(port->mcast_stats); 843 } 844 845 static void br_multicast_enable(struct bridge_mcast_own_query *query) 846 { 847 query->startup_sent = 0; 848 849 if (try_to_del_timer_sync(&query->timer) >= 0 || 850 del_timer(&query->timer)) 851 mod_timer(&query->timer, jiffies); 852 } 853 854 static void __br_multicast_enable_port(struct net_bridge_port *port) 855 { 856 struct net_bridge *br = port->br; 857 858 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev)) 859 return; 860 861 br_multicast_enable(&port->ip4_own_query); 862 #if IS_ENABLED(CONFIG_IPV6) 863 br_multicast_enable(&port->ip6_own_query); 864 #endif 865 if (port->multicast_router == MDB_RTR_TYPE_PERM && 866 hlist_unhashed(&port->rlist)) 867 br_multicast_add_router(br, port); 868 } 869 870 void br_multicast_enable_port(struct net_bridge_port *port) 871 { 872 struct net_bridge *br = port->br; 873 874 spin_lock(&br->multicast_lock); 875 __br_multicast_enable_port(port); 876 spin_unlock(&br->multicast_lock); 877 } 878 879 void br_multicast_disable_port(struct net_bridge_port *port) 880 { 881 struct net_bridge *br = port->br; 882 struct net_bridge_port_group *pg; 883 struct hlist_node *n; 884 885 spin_lock(&br->multicast_lock); 886 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist) 887 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT)) 888 br_multicast_del_pg(br, pg); 889 890 __del_port_router(port); 891 892 del_timer(&port->multicast_router_timer); 893 del_timer(&port->ip4_own_query.timer); 894 #if IS_ENABLED(CONFIG_IPV6) 895 del_timer(&port->ip6_own_query.timer); 896 #endif 897 spin_unlock(&br->multicast_lock); 898 } 899 900 static int br_ip4_multicast_igmp3_report(struct net_bridge *br, 901 struct net_bridge_port *port, 902 struct sk_buff *skb, 903 u16 vid) 904 { 905 const unsigned char *src; 906 struct igmpv3_report *ih; 907 struct igmpv3_grec *grec; 908 int i; 909 int len; 910 int num; 911 int type; 912 int err = 0; 913 __be32 group; 914 915 ih = igmpv3_report_hdr(skb); 916 num = ntohs(ih->ngrec); 917 len = skb_transport_offset(skb) + sizeof(*ih); 918 919 for (i = 0; i < num; i++) { 920 len += sizeof(*grec); 921 if (!ip_mc_may_pull(skb, len)) 922 return -EINVAL; 923 924 grec = (void *)(skb->data + len - sizeof(*grec)); 925 group = grec->grec_mca; 926 type = grec->grec_type; 927 928 len += ntohs(grec->grec_nsrcs) * 4; 929 if (!ip_mc_may_pull(skb, len)) 930 return -EINVAL; 931 932 /* We treat this as an IGMPv2 report for now. */ 933 switch (type) { 934 case IGMPV3_MODE_IS_INCLUDE: 935 case IGMPV3_MODE_IS_EXCLUDE: 936 case IGMPV3_CHANGE_TO_INCLUDE: 937 case IGMPV3_CHANGE_TO_EXCLUDE: 938 case IGMPV3_ALLOW_NEW_SOURCES: 939 case IGMPV3_BLOCK_OLD_SOURCES: 940 break; 941 942 default: 943 continue; 944 } 945 946 src = eth_hdr(skb)->h_source; 947 if ((type == IGMPV3_CHANGE_TO_INCLUDE || 948 type == IGMPV3_MODE_IS_INCLUDE) && 949 ntohs(grec->grec_nsrcs) == 0) { 950 br_ip4_multicast_leave_group(br, port, group, vid, src); 951 } else { 952 err = br_ip4_multicast_add_group(br, port, group, vid, 953 src); 954 if (err) 955 break; 956 } 957 } 958 959 return err; 960 } 961 962 #if IS_ENABLED(CONFIG_IPV6) 963 static int br_ip6_multicast_mld2_report(struct net_bridge *br, 964 struct net_bridge_port *port, 965 struct sk_buff *skb, 966 u16 vid) 967 { 968 unsigned int nsrcs_offset; 969 const unsigned char *src; 970 struct icmp6hdr *icmp6h; 971 struct mld2_grec *grec; 972 unsigned int grec_len; 973 int i; 974 int len; 975 int num; 976 int err = 0; 977 978 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h))) 979 return -EINVAL; 980 981 icmp6h = icmp6_hdr(skb); 982 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 983 len = skb_transport_offset(skb) + sizeof(*icmp6h); 984 985 for (i = 0; i < num; i++) { 986 __be16 *nsrcs, _nsrcs; 987 988 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs); 989 990 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < 991 nsrcs_offset + sizeof(_nsrcs)) 992 return -EINVAL; 993 994 nsrcs = skb_header_pointer(skb, nsrcs_offset, 995 sizeof(_nsrcs), &_nsrcs); 996 if (!nsrcs) 997 return -EINVAL; 998 999 grec_len = struct_size(grec, grec_src, ntohs(*nsrcs)); 1000 1001 if (!ipv6_mc_may_pull(skb, len + grec_len)) 1002 return -EINVAL; 1003 1004 grec = (struct mld2_grec *)(skb->data + len); 1005 len += grec_len; 1006 1007 /* We treat these as MLDv1 reports for now. */ 1008 switch (grec->grec_type) { 1009 case MLD2_MODE_IS_INCLUDE: 1010 case MLD2_MODE_IS_EXCLUDE: 1011 case MLD2_CHANGE_TO_INCLUDE: 1012 case MLD2_CHANGE_TO_EXCLUDE: 1013 case MLD2_ALLOW_NEW_SOURCES: 1014 case MLD2_BLOCK_OLD_SOURCES: 1015 break; 1016 1017 default: 1018 continue; 1019 } 1020 1021 src = eth_hdr(skb)->h_source; 1022 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE || 1023 grec->grec_type == MLD2_MODE_IS_INCLUDE) && 1024 ntohs(*nsrcs) == 0) { 1025 br_ip6_multicast_leave_group(br, port, &grec->grec_mca, 1026 vid, src); 1027 } else { 1028 err = br_ip6_multicast_add_group(br, port, 1029 &grec->grec_mca, vid, 1030 src); 1031 if (err) 1032 break; 1033 } 1034 } 1035 1036 return err; 1037 } 1038 #endif 1039 1040 static bool br_ip4_multicast_select_querier(struct net_bridge *br, 1041 struct net_bridge_port *port, 1042 __be32 saddr) 1043 { 1044 if (!timer_pending(&br->ip4_own_query.timer) && 1045 !timer_pending(&br->ip4_other_query.timer)) 1046 goto update; 1047 1048 if (!br->ip4_querier.addr.u.ip4) 1049 goto update; 1050 1051 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4)) 1052 goto update; 1053 1054 return false; 1055 1056 update: 1057 br->ip4_querier.addr.u.ip4 = saddr; 1058 1059 /* update protected by general multicast_lock by caller */ 1060 rcu_assign_pointer(br->ip4_querier.port, port); 1061 1062 return true; 1063 } 1064 1065 #if IS_ENABLED(CONFIG_IPV6) 1066 static bool br_ip6_multicast_select_querier(struct net_bridge *br, 1067 struct net_bridge_port *port, 1068 struct in6_addr *saddr) 1069 { 1070 if (!timer_pending(&br->ip6_own_query.timer) && 1071 !timer_pending(&br->ip6_other_query.timer)) 1072 goto update; 1073 1074 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0) 1075 goto update; 1076 1077 return false; 1078 1079 update: 1080 br->ip6_querier.addr.u.ip6 = *saddr; 1081 1082 /* update protected by general multicast_lock by caller */ 1083 rcu_assign_pointer(br->ip6_querier.port, port); 1084 1085 return true; 1086 } 1087 #endif 1088 1089 static bool br_multicast_select_querier(struct net_bridge *br, 1090 struct net_bridge_port *port, 1091 struct br_ip *saddr) 1092 { 1093 switch (saddr->proto) { 1094 case htons(ETH_P_IP): 1095 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4); 1096 #if IS_ENABLED(CONFIG_IPV6) 1097 case htons(ETH_P_IPV6): 1098 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6); 1099 #endif 1100 } 1101 1102 return false; 1103 } 1104 1105 static void 1106 br_multicast_update_query_timer(struct net_bridge *br, 1107 struct bridge_mcast_other_query *query, 1108 unsigned long max_delay) 1109 { 1110 if (!timer_pending(&query->timer)) 1111 query->delay_time = jiffies + max_delay; 1112 1113 mod_timer(&query->timer, jiffies + br->multicast_querier_interval); 1114 } 1115 1116 static void br_port_mc_router_state_change(struct net_bridge_port *p, 1117 bool is_mc_router) 1118 { 1119 struct switchdev_attr attr = { 1120 .orig_dev = p->dev, 1121 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER, 1122 .flags = SWITCHDEV_F_DEFER, 1123 .u.mrouter = is_mc_router, 1124 }; 1125 1126 switchdev_port_attr_set(p->dev, &attr); 1127 } 1128 1129 /* 1130 * Add port to router_list 1131 * list is maintained ordered by pointer value 1132 * and locked by br->multicast_lock and RCU 1133 */ 1134 static void br_multicast_add_router(struct net_bridge *br, 1135 struct net_bridge_port *port) 1136 { 1137 struct net_bridge_port *p; 1138 struct hlist_node *slot = NULL; 1139 1140 if (!hlist_unhashed(&port->rlist)) 1141 return; 1142 1143 hlist_for_each_entry(p, &br->router_list, rlist) { 1144 if ((unsigned long) port >= (unsigned long) p) 1145 break; 1146 slot = &p->rlist; 1147 } 1148 1149 if (slot) 1150 hlist_add_behind_rcu(&port->rlist, slot); 1151 else 1152 hlist_add_head_rcu(&port->rlist, &br->router_list); 1153 br_rtr_notify(br->dev, port, RTM_NEWMDB); 1154 br_port_mc_router_state_change(port, true); 1155 } 1156 1157 static void br_multicast_mark_router(struct net_bridge *br, 1158 struct net_bridge_port *port) 1159 { 1160 unsigned long now = jiffies; 1161 1162 if (!port) { 1163 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) { 1164 if (!timer_pending(&br->multicast_router_timer)) 1165 br_mc_router_state_change(br, true); 1166 mod_timer(&br->multicast_router_timer, 1167 now + br->multicast_querier_interval); 1168 } 1169 return; 1170 } 1171 1172 if (port->multicast_router == MDB_RTR_TYPE_DISABLED || 1173 port->multicast_router == MDB_RTR_TYPE_PERM) 1174 return; 1175 1176 br_multicast_add_router(br, port); 1177 1178 mod_timer(&port->multicast_router_timer, 1179 now + br->multicast_querier_interval); 1180 } 1181 1182 static void br_multicast_query_received(struct net_bridge *br, 1183 struct net_bridge_port *port, 1184 struct bridge_mcast_other_query *query, 1185 struct br_ip *saddr, 1186 unsigned long max_delay) 1187 { 1188 if (!br_multicast_select_querier(br, port, saddr)) 1189 return; 1190 1191 br_multicast_update_query_timer(br, query, max_delay); 1192 br_multicast_mark_router(br, port); 1193 } 1194 1195 static void br_ip4_multicast_query(struct net_bridge *br, 1196 struct net_bridge_port *port, 1197 struct sk_buff *skb, 1198 u16 vid) 1199 { 1200 unsigned int transport_len = ip_transport_len(skb); 1201 const struct iphdr *iph = ip_hdr(skb); 1202 struct igmphdr *ih = igmp_hdr(skb); 1203 struct net_bridge_mdb_entry *mp; 1204 struct igmpv3_query *ih3; 1205 struct net_bridge_port_group *p; 1206 struct net_bridge_port_group __rcu **pp; 1207 struct br_ip saddr; 1208 unsigned long max_delay; 1209 unsigned long now = jiffies; 1210 __be32 group; 1211 1212 spin_lock(&br->multicast_lock); 1213 if (!netif_running(br->dev) || 1214 (port && port->state == BR_STATE_DISABLED)) 1215 goto out; 1216 1217 group = ih->group; 1218 1219 if (transport_len == sizeof(*ih)) { 1220 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 1221 1222 if (!max_delay) { 1223 max_delay = 10 * HZ; 1224 group = 0; 1225 } 1226 } else if (transport_len >= sizeof(*ih3)) { 1227 ih3 = igmpv3_query_hdr(skb); 1228 if (ih3->nsrcs) 1229 goto out; 1230 1231 max_delay = ih3->code ? 1232 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 1233 } else { 1234 goto out; 1235 } 1236 1237 if (!group) { 1238 saddr.proto = htons(ETH_P_IP); 1239 saddr.u.ip4 = iph->saddr; 1240 1241 br_multicast_query_received(br, port, &br->ip4_other_query, 1242 &saddr, max_delay); 1243 goto out; 1244 } 1245 1246 mp = br_mdb_ip4_get(br, group, vid); 1247 if (!mp) 1248 goto out; 1249 1250 max_delay *= br->multicast_last_member_count; 1251 1252 if (mp->host_joined && 1253 (timer_pending(&mp->timer) ? 1254 time_after(mp->timer.expires, now + max_delay) : 1255 try_to_del_timer_sync(&mp->timer) >= 0)) 1256 mod_timer(&mp->timer, now + max_delay); 1257 1258 for (pp = &mp->ports; 1259 (p = mlock_dereference(*pp, br)) != NULL; 1260 pp = &p->next) { 1261 if (timer_pending(&p->timer) ? 1262 time_after(p->timer.expires, now + max_delay) : 1263 try_to_del_timer_sync(&p->timer) >= 0) 1264 mod_timer(&p->timer, now + max_delay); 1265 } 1266 1267 out: 1268 spin_unlock(&br->multicast_lock); 1269 } 1270 1271 #if IS_ENABLED(CONFIG_IPV6) 1272 static int br_ip6_multicast_query(struct net_bridge *br, 1273 struct net_bridge_port *port, 1274 struct sk_buff *skb, 1275 u16 vid) 1276 { 1277 unsigned int transport_len = ipv6_transport_len(skb); 1278 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 1279 struct mld_msg *mld; 1280 struct net_bridge_mdb_entry *mp; 1281 struct mld2_query *mld2q; 1282 struct net_bridge_port_group *p; 1283 struct net_bridge_port_group __rcu **pp; 1284 struct br_ip saddr; 1285 unsigned long max_delay; 1286 unsigned long now = jiffies; 1287 unsigned int offset = skb_transport_offset(skb); 1288 const struct in6_addr *group = NULL; 1289 bool is_general_query; 1290 int err = 0; 1291 1292 spin_lock(&br->multicast_lock); 1293 if (!netif_running(br->dev) || 1294 (port && port->state == BR_STATE_DISABLED)) 1295 goto out; 1296 1297 if (transport_len == sizeof(*mld)) { 1298 if (!pskb_may_pull(skb, offset + sizeof(*mld))) { 1299 err = -EINVAL; 1300 goto out; 1301 } 1302 mld = (struct mld_msg *) icmp6_hdr(skb); 1303 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); 1304 if (max_delay) 1305 group = &mld->mld_mca; 1306 } else { 1307 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) { 1308 err = -EINVAL; 1309 goto out; 1310 } 1311 mld2q = (struct mld2_query *)icmp6_hdr(skb); 1312 if (!mld2q->mld2q_nsrcs) 1313 group = &mld2q->mld2q_mca; 1314 1315 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); 1316 } 1317 1318 is_general_query = group && ipv6_addr_any(group); 1319 1320 if (is_general_query) { 1321 saddr.proto = htons(ETH_P_IPV6); 1322 saddr.u.ip6 = ip6h->saddr; 1323 1324 br_multicast_query_received(br, port, &br->ip6_other_query, 1325 &saddr, max_delay); 1326 goto out; 1327 } else if (!group) { 1328 goto out; 1329 } 1330 1331 mp = br_mdb_ip6_get(br, group, vid); 1332 if (!mp) 1333 goto out; 1334 1335 max_delay *= br->multicast_last_member_count; 1336 if (mp->host_joined && 1337 (timer_pending(&mp->timer) ? 1338 time_after(mp->timer.expires, now + max_delay) : 1339 try_to_del_timer_sync(&mp->timer) >= 0)) 1340 mod_timer(&mp->timer, now + max_delay); 1341 1342 for (pp = &mp->ports; 1343 (p = mlock_dereference(*pp, br)) != NULL; 1344 pp = &p->next) { 1345 if (timer_pending(&p->timer) ? 1346 time_after(p->timer.expires, now + max_delay) : 1347 try_to_del_timer_sync(&p->timer) >= 0) 1348 mod_timer(&p->timer, now + max_delay); 1349 } 1350 1351 out: 1352 spin_unlock(&br->multicast_lock); 1353 return err; 1354 } 1355 #endif 1356 1357 static void 1358 br_multicast_leave_group(struct net_bridge *br, 1359 struct net_bridge_port *port, 1360 struct br_ip *group, 1361 struct bridge_mcast_other_query *other_query, 1362 struct bridge_mcast_own_query *own_query, 1363 const unsigned char *src) 1364 { 1365 struct net_bridge_mdb_entry *mp; 1366 struct net_bridge_port_group *p; 1367 unsigned long now; 1368 unsigned long time; 1369 1370 spin_lock(&br->multicast_lock); 1371 if (!netif_running(br->dev) || 1372 (port && port->state == BR_STATE_DISABLED)) 1373 goto out; 1374 1375 mp = br_mdb_ip_get(br, group); 1376 if (!mp) 1377 goto out; 1378 1379 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { 1380 struct net_bridge_port_group __rcu **pp; 1381 1382 for (pp = &mp->ports; 1383 (p = mlock_dereference(*pp, br)) != NULL; 1384 pp = &p->next) { 1385 if (!br_port_group_equal(p, port, src)) 1386 continue; 1387 1388 rcu_assign_pointer(*pp, p->next); 1389 hlist_del_init(&p->mglist); 1390 del_timer(&p->timer); 1391 kfree_rcu(p, rcu); 1392 br_mdb_notify(br->dev, port, group, RTM_DELMDB, 1393 p->flags); 1394 1395 if (!mp->ports && !mp->host_joined && 1396 netif_running(br->dev)) 1397 mod_timer(&mp->timer, jiffies); 1398 } 1399 goto out; 1400 } 1401 1402 if (timer_pending(&other_query->timer)) 1403 goto out; 1404 1405 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) { 1406 __br_multicast_send_query(br, port, &mp->addr); 1407 1408 time = jiffies + br->multicast_last_member_count * 1409 br->multicast_last_member_interval; 1410 1411 mod_timer(&own_query->timer, time); 1412 1413 for (p = mlock_dereference(mp->ports, br); 1414 p != NULL; 1415 p = mlock_dereference(p->next, br)) { 1416 if (!br_port_group_equal(p, port, src)) 1417 continue; 1418 1419 if (!hlist_unhashed(&p->mglist) && 1420 (timer_pending(&p->timer) ? 1421 time_after(p->timer.expires, time) : 1422 try_to_del_timer_sync(&p->timer) >= 0)) { 1423 mod_timer(&p->timer, time); 1424 } 1425 1426 break; 1427 } 1428 } 1429 1430 now = jiffies; 1431 time = now + br->multicast_last_member_count * 1432 br->multicast_last_member_interval; 1433 1434 if (!port) { 1435 if (mp->host_joined && 1436 (timer_pending(&mp->timer) ? 1437 time_after(mp->timer.expires, time) : 1438 try_to_del_timer_sync(&mp->timer) >= 0)) { 1439 mod_timer(&mp->timer, time); 1440 } 1441 1442 goto out; 1443 } 1444 1445 for (p = mlock_dereference(mp->ports, br); 1446 p != NULL; 1447 p = mlock_dereference(p->next, br)) { 1448 if (p->port != port) 1449 continue; 1450 1451 if (!hlist_unhashed(&p->mglist) && 1452 (timer_pending(&p->timer) ? 1453 time_after(p->timer.expires, time) : 1454 try_to_del_timer_sync(&p->timer) >= 0)) { 1455 mod_timer(&p->timer, time); 1456 } 1457 1458 break; 1459 } 1460 out: 1461 spin_unlock(&br->multicast_lock); 1462 } 1463 1464 static void br_ip4_multicast_leave_group(struct net_bridge *br, 1465 struct net_bridge_port *port, 1466 __be32 group, 1467 __u16 vid, 1468 const unsigned char *src) 1469 { 1470 struct br_ip br_group; 1471 struct bridge_mcast_own_query *own_query; 1472 1473 if (ipv4_is_local_multicast(group)) 1474 return; 1475 1476 own_query = port ? &port->ip4_own_query : &br->ip4_own_query; 1477 1478 memset(&br_group, 0, sizeof(br_group)); 1479 br_group.u.ip4 = group; 1480 br_group.proto = htons(ETH_P_IP); 1481 br_group.vid = vid; 1482 1483 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query, 1484 own_query, src); 1485 } 1486 1487 #if IS_ENABLED(CONFIG_IPV6) 1488 static void br_ip6_multicast_leave_group(struct net_bridge *br, 1489 struct net_bridge_port *port, 1490 const struct in6_addr *group, 1491 __u16 vid, 1492 const unsigned char *src) 1493 { 1494 struct br_ip br_group; 1495 struct bridge_mcast_own_query *own_query; 1496 1497 if (ipv6_addr_is_ll_all_nodes(group)) 1498 return; 1499 1500 own_query = port ? &port->ip6_own_query : &br->ip6_own_query; 1501 1502 memset(&br_group, 0, sizeof(br_group)); 1503 br_group.u.ip6 = *group; 1504 br_group.proto = htons(ETH_P_IPV6); 1505 br_group.vid = vid; 1506 1507 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query, 1508 own_query, src); 1509 } 1510 #endif 1511 1512 static void br_multicast_err_count(const struct net_bridge *br, 1513 const struct net_bridge_port *p, 1514 __be16 proto) 1515 { 1516 struct bridge_mcast_stats __percpu *stats; 1517 struct bridge_mcast_stats *pstats; 1518 1519 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 1520 return; 1521 1522 if (p) 1523 stats = p->mcast_stats; 1524 else 1525 stats = br->mcast_stats; 1526 if (WARN_ON(!stats)) 1527 return; 1528 1529 pstats = this_cpu_ptr(stats); 1530 1531 u64_stats_update_begin(&pstats->syncp); 1532 switch (proto) { 1533 case htons(ETH_P_IP): 1534 pstats->mstats.igmp_parse_errors++; 1535 break; 1536 #if IS_ENABLED(CONFIG_IPV6) 1537 case htons(ETH_P_IPV6): 1538 pstats->mstats.mld_parse_errors++; 1539 break; 1540 #endif 1541 } 1542 u64_stats_update_end(&pstats->syncp); 1543 } 1544 1545 static void br_multicast_pim(struct net_bridge *br, 1546 struct net_bridge_port *port, 1547 const struct sk_buff *skb) 1548 { 1549 unsigned int offset = skb_transport_offset(skb); 1550 struct pimhdr *pimhdr, _pimhdr; 1551 1552 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr); 1553 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION || 1554 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO) 1555 return; 1556 1557 br_multicast_mark_router(br, port); 1558 } 1559 1560 static int br_ip4_multicast_mrd_rcv(struct net_bridge *br, 1561 struct net_bridge_port *port, 1562 struct sk_buff *skb) 1563 { 1564 if (ip_hdr(skb)->protocol != IPPROTO_IGMP || 1565 igmp_hdr(skb)->type != IGMP_MRDISC_ADV) 1566 return -ENOMSG; 1567 1568 br_multicast_mark_router(br, port); 1569 1570 return 0; 1571 } 1572 1573 static int br_multicast_ipv4_rcv(struct net_bridge *br, 1574 struct net_bridge_port *port, 1575 struct sk_buff *skb, 1576 u16 vid) 1577 { 1578 const unsigned char *src; 1579 struct igmphdr *ih; 1580 int err; 1581 1582 err = ip_mc_check_igmp(skb); 1583 1584 if (err == -ENOMSG) { 1585 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) { 1586 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1587 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) { 1588 if (ip_hdr(skb)->protocol == IPPROTO_PIM) 1589 br_multicast_pim(br, port, skb); 1590 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) { 1591 br_ip4_multicast_mrd_rcv(br, port, skb); 1592 } 1593 1594 return 0; 1595 } else if (err < 0) { 1596 br_multicast_err_count(br, port, skb->protocol); 1597 return err; 1598 } 1599 1600 ih = igmp_hdr(skb); 1601 src = eth_hdr(skb)->h_source; 1602 BR_INPUT_SKB_CB(skb)->igmp = ih->type; 1603 1604 switch (ih->type) { 1605 case IGMP_HOST_MEMBERSHIP_REPORT: 1606 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1607 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1608 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src); 1609 break; 1610 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1611 err = br_ip4_multicast_igmp3_report(br, port, skb, vid); 1612 break; 1613 case IGMP_HOST_MEMBERSHIP_QUERY: 1614 br_ip4_multicast_query(br, port, skb, vid); 1615 break; 1616 case IGMP_HOST_LEAVE_MESSAGE: 1617 br_ip4_multicast_leave_group(br, port, ih->group, vid, src); 1618 break; 1619 } 1620 1621 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp, 1622 BR_MCAST_DIR_RX); 1623 1624 return err; 1625 } 1626 1627 #if IS_ENABLED(CONFIG_IPV6) 1628 static int br_ip6_multicast_mrd_rcv(struct net_bridge *br, 1629 struct net_bridge_port *port, 1630 struct sk_buff *skb) 1631 { 1632 int ret; 1633 1634 if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6) 1635 return -ENOMSG; 1636 1637 ret = ipv6_mc_check_icmpv6(skb); 1638 if (ret < 0) 1639 return ret; 1640 1641 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV) 1642 return -ENOMSG; 1643 1644 br_multicast_mark_router(br, port); 1645 1646 return 0; 1647 } 1648 1649 static int br_multicast_ipv6_rcv(struct net_bridge *br, 1650 struct net_bridge_port *port, 1651 struct sk_buff *skb, 1652 u16 vid) 1653 { 1654 const unsigned char *src; 1655 struct mld_msg *mld; 1656 int err; 1657 1658 err = ipv6_mc_check_mld(skb); 1659 1660 if (err == -ENOMSG) { 1661 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr)) 1662 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1663 1664 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) { 1665 err = br_ip6_multicast_mrd_rcv(br, port, skb); 1666 1667 if (err < 0 && err != -ENOMSG) { 1668 br_multicast_err_count(br, port, skb->protocol); 1669 return err; 1670 } 1671 } 1672 1673 return 0; 1674 } else if (err < 0) { 1675 br_multicast_err_count(br, port, skb->protocol); 1676 return err; 1677 } 1678 1679 mld = (struct mld_msg *)skb_transport_header(skb); 1680 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type; 1681 1682 switch (mld->mld_type) { 1683 case ICMPV6_MGM_REPORT: 1684 src = eth_hdr(skb)->h_source; 1685 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1686 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid, 1687 src); 1688 break; 1689 case ICMPV6_MLD2_REPORT: 1690 err = br_ip6_multicast_mld2_report(br, port, skb, vid); 1691 break; 1692 case ICMPV6_MGM_QUERY: 1693 err = br_ip6_multicast_query(br, port, skb, vid); 1694 break; 1695 case ICMPV6_MGM_REDUCTION: 1696 src = eth_hdr(skb)->h_source; 1697 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src); 1698 break; 1699 } 1700 1701 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp, 1702 BR_MCAST_DIR_RX); 1703 1704 return err; 1705 } 1706 #endif 1707 1708 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 1709 struct sk_buff *skb, u16 vid) 1710 { 1711 int ret = 0; 1712 1713 BR_INPUT_SKB_CB(skb)->igmp = 0; 1714 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 1715 1716 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1717 return 0; 1718 1719 switch (skb->protocol) { 1720 case htons(ETH_P_IP): 1721 ret = br_multicast_ipv4_rcv(br, port, skb, vid); 1722 break; 1723 #if IS_ENABLED(CONFIG_IPV6) 1724 case htons(ETH_P_IPV6): 1725 ret = br_multicast_ipv6_rcv(br, port, skb, vid); 1726 break; 1727 #endif 1728 } 1729 1730 return ret; 1731 } 1732 1733 static void br_multicast_query_expired(struct net_bridge *br, 1734 struct bridge_mcast_own_query *query, 1735 struct bridge_mcast_querier *querier) 1736 { 1737 spin_lock(&br->multicast_lock); 1738 if (query->startup_sent < br->multicast_startup_query_count) 1739 query->startup_sent++; 1740 1741 RCU_INIT_POINTER(querier->port, NULL); 1742 br_multicast_send_query(br, NULL, query); 1743 spin_unlock(&br->multicast_lock); 1744 } 1745 1746 static void br_ip4_multicast_query_expired(struct timer_list *t) 1747 { 1748 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer); 1749 1750 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier); 1751 } 1752 1753 #if IS_ENABLED(CONFIG_IPV6) 1754 static void br_ip6_multicast_query_expired(struct timer_list *t) 1755 { 1756 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer); 1757 1758 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier); 1759 } 1760 #endif 1761 1762 void br_multicast_init(struct net_bridge *br) 1763 { 1764 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX; 1765 1766 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1767 br->multicast_last_member_count = 2; 1768 br->multicast_startup_query_count = 2; 1769 1770 br->multicast_last_member_interval = HZ; 1771 br->multicast_query_response_interval = 10 * HZ; 1772 br->multicast_startup_query_interval = 125 * HZ / 4; 1773 br->multicast_query_interval = 125 * HZ; 1774 br->multicast_querier_interval = 255 * HZ; 1775 br->multicast_membership_interval = 260 * HZ; 1776 1777 br->ip4_other_query.delay_time = 0; 1778 br->ip4_querier.port = NULL; 1779 br->multicast_igmp_version = 2; 1780 #if IS_ENABLED(CONFIG_IPV6) 1781 br->multicast_mld_version = 1; 1782 br->ip6_other_query.delay_time = 0; 1783 br->ip6_querier.port = NULL; 1784 #endif 1785 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true); 1786 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true); 1787 1788 spin_lock_init(&br->multicast_lock); 1789 timer_setup(&br->multicast_router_timer, 1790 br_multicast_local_router_expired, 0); 1791 timer_setup(&br->ip4_other_query.timer, 1792 br_ip4_multicast_querier_expired, 0); 1793 timer_setup(&br->ip4_own_query.timer, 1794 br_ip4_multicast_query_expired, 0); 1795 #if IS_ENABLED(CONFIG_IPV6) 1796 timer_setup(&br->ip6_other_query.timer, 1797 br_ip6_multicast_querier_expired, 0); 1798 timer_setup(&br->ip6_own_query.timer, 1799 br_ip6_multicast_query_expired, 0); 1800 #endif 1801 INIT_HLIST_HEAD(&br->mdb_list); 1802 } 1803 1804 static void br_ip4_multicast_join_snoopers(struct net_bridge *br) 1805 { 1806 struct in_device *in_dev = in_dev_get(br->dev); 1807 1808 if (!in_dev) 1809 return; 1810 1811 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 1812 in_dev_put(in_dev); 1813 } 1814 1815 #if IS_ENABLED(CONFIG_IPV6) 1816 static void br_ip6_multicast_join_snoopers(struct net_bridge *br) 1817 { 1818 struct in6_addr addr; 1819 1820 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 1821 ipv6_dev_mc_inc(br->dev, &addr); 1822 } 1823 #else 1824 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br) 1825 { 1826 } 1827 #endif 1828 1829 static void br_multicast_join_snoopers(struct net_bridge *br) 1830 { 1831 br_ip4_multicast_join_snoopers(br); 1832 br_ip6_multicast_join_snoopers(br); 1833 } 1834 1835 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br) 1836 { 1837 struct in_device *in_dev = in_dev_get(br->dev); 1838 1839 if (WARN_ON(!in_dev)) 1840 return; 1841 1842 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 1843 in_dev_put(in_dev); 1844 } 1845 1846 #if IS_ENABLED(CONFIG_IPV6) 1847 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 1848 { 1849 struct in6_addr addr; 1850 1851 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 1852 ipv6_dev_mc_dec(br->dev, &addr); 1853 } 1854 #else 1855 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 1856 { 1857 } 1858 #endif 1859 1860 static void br_multicast_leave_snoopers(struct net_bridge *br) 1861 { 1862 br_ip4_multicast_leave_snoopers(br); 1863 br_ip6_multicast_leave_snoopers(br); 1864 } 1865 1866 static void __br_multicast_open(struct net_bridge *br, 1867 struct bridge_mcast_own_query *query) 1868 { 1869 query->startup_sent = 0; 1870 1871 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1872 return; 1873 1874 mod_timer(&query->timer, jiffies); 1875 } 1876 1877 void br_multicast_open(struct net_bridge *br) 1878 { 1879 if (br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1880 br_multicast_join_snoopers(br); 1881 1882 __br_multicast_open(br, &br->ip4_own_query); 1883 #if IS_ENABLED(CONFIG_IPV6) 1884 __br_multicast_open(br, &br->ip6_own_query); 1885 #endif 1886 } 1887 1888 void br_multicast_stop(struct net_bridge *br) 1889 { 1890 del_timer_sync(&br->multicast_router_timer); 1891 del_timer_sync(&br->ip4_other_query.timer); 1892 del_timer_sync(&br->ip4_own_query.timer); 1893 #if IS_ENABLED(CONFIG_IPV6) 1894 del_timer_sync(&br->ip6_other_query.timer); 1895 del_timer_sync(&br->ip6_own_query.timer); 1896 #endif 1897 1898 if (br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1899 br_multicast_leave_snoopers(br); 1900 } 1901 1902 void br_multicast_dev_del(struct net_bridge *br) 1903 { 1904 struct net_bridge_mdb_entry *mp; 1905 struct hlist_node *tmp; 1906 1907 spin_lock_bh(&br->multicast_lock); 1908 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) { 1909 del_timer(&mp->timer); 1910 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode, 1911 br_mdb_rht_params); 1912 hlist_del_rcu(&mp->mdb_node); 1913 kfree_rcu(mp, rcu); 1914 } 1915 spin_unlock_bh(&br->multicast_lock); 1916 1917 rcu_barrier(); 1918 } 1919 1920 int br_multicast_set_router(struct net_bridge *br, unsigned long val) 1921 { 1922 int err = -EINVAL; 1923 1924 spin_lock_bh(&br->multicast_lock); 1925 1926 switch (val) { 1927 case MDB_RTR_TYPE_DISABLED: 1928 case MDB_RTR_TYPE_PERM: 1929 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM); 1930 del_timer(&br->multicast_router_timer); 1931 br->multicast_router = val; 1932 err = 0; 1933 break; 1934 case MDB_RTR_TYPE_TEMP_QUERY: 1935 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY) 1936 br_mc_router_state_change(br, false); 1937 br->multicast_router = val; 1938 err = 0; 1939 break; 1940 } 1941 1942 spin_unlock_bh(&br->multicast_lock); 1943 1944 return err; 1945 } 1946 1947 static void __del_port_router(struct net_bridge_port *p) 1948 { 1949 if (hlist_unhashed(&p->rlist)) 1950 return; 1951 hlist_del_init_rcu(&p->rlist); 1952 br_rtr_notify(p->br->dev, p, RTM_DELMDB); 1953 br_port_mc_router_state_change(p, false); 1954 1955 /* don't allow timer refresh */ 1956 if (p->multicast_router == MDB_RTR_TYPE_TEMP) 1957 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1958 } 1959 1960 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) 1961 { 1962 struct net_bridge *br = p->br; 1963 unsigned long now = jiffies; 1964 int err = -EINVAL; 1965 1966 spin_lock(&br->multicast_lock); 1967 if (p->multicast_router == val) { 1968 /* Refresh the temp router port timer */ 1969 if (p->multicast_router == MDB_RTR_TYPE_TEMP) 1970 mod_timer(&p->multicast_router_timer, 1971 now + br->multicast_querier_interval); 1972 err = 0; 1973 goto unlock; 1974 } 1975 switch (val) { 1976 case MDB_RTR_TYPE_DISABLED: 1977 p->multicast_router = MDB_RTR_TYPE_DISABLED; 1978 __del_port_router(p); 1979 del_timer(&p->multicast_router_timer); 1980 break; 1981 case MDB_RTR_TYPE_TEMP_QUERY: 1982 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1983 __del_port_router(p); 1984 break; 1985 case MDB_RTR_TYPE_PERM: 1986 p->multicast_router = MDB_RTR_TYPE_PERM; 1987 del_timer(&p->multicast_router_timer); 1988 br_multicast_add_router(br, p); 1989 break; 1990 case MDB_RTR_TYPE_TEMP: 1991 p->multicast_router = MDB_RTR_TYPE_TEMP; 1992 br_multicast_mark_router(br, p); 1993 break; 1994 default: 1995 goto unlock; 1996 } 1997 err = 0; 1998 unlock: 1999 spin_unlock(&br->multicast_lock); 2000 2001 return err; 2002 } 2003 2004 static void br_multicast_start_querier(struct net_bridge *br, 2005 struct bridge_mcast_own_query *query) 2006 { 2007 struct net_bridge_port *port; 2008 2009 __br_multicast_open(br, query); 2010 2011 rcu_read_lock(); 2012 list_for_each_entry_rcu(port, &br->port_list, list) { 2013 if (port->state == BR_STATE_DISABLED || 2014 port->state == BR_STATE_BLOCKING) 2015 continue; 2016 2017 if (query == &br->ip4_own_query) 2018 br_multicast_enable(&port->ip4_own_query); 2019 #if IS_ENABLED(CONFIG_IPV6) 2020 else 2021 br_multicast_enable(&port->ip6_own_query); 2022 #endif 2023 } 2024 rcu_read_unlock(); 2025 } 2026 2027 int br_multicast_toggle(struct net_bridge *br, unsigned long val) 2028 { 2029 struct net_bridge_port *port; 2030 2031 spin_lock_bh(&br->multicast_lock); 2032 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val) 2033 goto unlock; 2034 2035 br_mc_disabled_update(br->dev, val); 2036 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val); 2037 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) { 2038 br_multicast_leave_snoopers(br); 2039 goto unlock; 2040 } 2041 2042 if (!netif_running(br->dev)) 2043 goto unlock; 2044 2045 br_multicast_open(br); 2046 list_for_each_entry(port, &br->port_list, list) 2047 __br_multicast_enable_port(port); 2048 2049 unlock: 2050 spin_unlock_bh(&br->multicast_lock); 2051 2052 return 0; 2053 } 2054 2055 bool br_multicast_enabled(const struct net_device *dev) 2056 { 2057 struct net_bridge *br = netdev_priv(dev); 2058 2059 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED); 2060 } 2061 EXPORT_SYMBOL_GPL(br_multicast_enabled); 2062 2063 bool br_multicast_router(const struct net_device *dev) 2064 { 2065 struct net_bridge *br = netdev_priv(dev); 2066 bool is_router; 2067 2068 spin_lock_bh(&br->multicast_lock); 2069 is_router = br_multicast_is_router(br); 2070 spin_unlock_bh(&br->multicast_lock); 2071 return is_router; 2072 } 2073 EXPORT_SYMBOL_GPL(br_multicast_router); 2074 2075 int br_multicast_set_querier(struct net_bridge *br, unsigned long val) 2076 { 2077 unsigned long max_delay; 2078 2079 val = !!val; 2080 2081 spin_lock_bh(&br->multicast_lock); 2082 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val) 2083 goto unlock; 2084 2085 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val); 2086 if (!val) 2087 goto unlock; 2088 2089 max_delay = br->multicast_query_response_interval; 2090 2091 if (!timer_pending(&br->ip4_other_query.timer)) 2092 br->ip4_other_query.delay_time = jiffies + max_delay; 2093 2094 br_multicast_start_querier(br, &br->ip4_own_query); 2095 2096 #if IS_ENABLED(CONFIG_IPV6) 2097 if (!timer_pending(&br->ip6_other_query.timer)) 2098 br->ip6_other_query.delay_time = jiffies + max_delay; 2099 2100 br_multicast_start_querier(br, &br->ip6_own_query); 2101 #endif 2102 2103 unlock: 2104 spin_unlock_bh(&br->multicast_lock); 2105 2106 return 0; 2107 } 2108 2109 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val) 2110 { 2111 /* Currently we support only version 2 and 3 */ 2112 switch (val) { 2113 case 2: 2114 case 3: 2115 break; 2116 default: 2117 return -EINVAL; 2118 } 2119 2120 spin_lock_bh(&br->multicast_lock); 2121 br->multicast_igmp_version = val; 2122 spin_unlock_bh(&br->multicast_lock); 2123 2124 return 0; 2125 } 2126 2127 #if IS_ENABLED(CONFIG_IPV6) 2128 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val) 2129 { 2130 /* Currently we support version 1 and 2 */ 2131 switch (val) { 2132 case 1: 2133 case 2: 2134 break; 2135 default: 2136 return -EINVAL; 2137 } 2138 2139 spin_lock_bh(&br->multicast_lock); 2140 br->multicast_mld_version = val; 2141 spin_unlock_bh(&br->multicast_lock); 2142 2143 return 0; 2144 } 2145 #endif 2146 2147 /** 2148 * br_multicast_list_adjacent - Returns snooped multicast addresses 2149 * @dev: The bridge port adjacent to which to retrieve addresses 2150 * @br_ip_list: The list to store found, snooped multicast IP addresses in 2151 * 2152 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast 2153 * snooping feature on all bridge ports of dev's bridge device, excluding 2154 * the addresses from dev itself. 2155 * 2156 * Returns the number of items added to br_ip_list. 2157 * 2158 * Notes: 2159 * - br_ip_list needs to be initialized by caller 2160 * - br_ip_list might contain duplicates in the end 2161 * (needs to be taken care of by caller) 2162 * - br_ip_list needs to be freed by caller 2163 */ 2164 int br_multicast_list_adjacent(struct net_device *dev, 2165 struct list_head *br_ip_list) 2166 { 2167 struct net_bridge *br; 2168 struct net_bridge_port *port; 2169 struct net_bridge_port_group *group; 2170 struct br_ip_list *entry; 2171 int count = 0; 2172 2173 rcu_read_lock(); 2174 if (!br_ip_list || !netif_is_bridge_port(dev)) 2175 goto unlock; 2176 2177 port = br_port_get_rcu(dev); 2178 if (!port || !port->br) 2179 goto unlock; 2180 2181 br = port->br; 2182 2183 list_for_each_entry_rcu(port, &br->port_list, list) { 2184 if (!port->dev || port->dev == dev) 2185 continue; 2186 2187 hlist_for_each_entry_rcu(group, &port->mglist, mglist) { 2188 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 2189 if (!entry) 2190 goto unlock; 2191 2192 entry->addr = group->addr; 2193 list_add(&entry->list, br_ip_list); 2194 count++; 2195 } 2196 } 2197 2198 unlock: 2199 rcu_read_unlock(); 2200 return count; 2201 } 2202 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); 2203 2204 /** 2205 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge 2206 * @dev: The bridge port providing the bridge on which to check for a querier 2207 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 2208 * 2209 * Checks whether the given interface has a bridge on top and if so returns 2210 * true if a valid querier exists anywhere on the bridged link layer. 2211 * Otherwise returns false. 2212 */ 2213 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto) 2214 { 2215 struct net_bridge *br; 2216 struct net_bridge_port *port; 2217 struct ethhdr eth; 2218 bool ret = false; 2219 2220 rcu_read_lock(); 2221 if (!netif_is_bridge_port(dev)) 2222 goto unlock; 2223 2224 port = br_port_get_rcu(dev); 2225 if (!port || !port->br) 2226 goto unlock; 2227 2228 br = port->br; 2229 2230 memset(ð, 0, sizeof(eth)); 2231 eth.h_proto = htons(proto); 2232 2233 ret = br_multicast_querier_exists(br, ð); 2234 2235 unlock: 2236 rcu_read_unlock(); 2237 return ret; 2238 } 2239 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere); 2240 2241 /** 2242 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port 2243 * @dev: The bridge port adjacent to which to check for a querier 2244 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 2245 * 2246 * Checks whether the given interface has a bridge on top and if so returns 2247 * true if a selected querier is behind one of the other ports of this 2248 * bridge. Otherwise returns false. 2249 */ 2250 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) 2251 { 2252 struct net_bridge *br; 2253 struct net_bridge_port *port; 2254 bool ret = false; 2255 2256 rcu_read_lock(); 2257 if (!netif_is_bridge_port(dev)) 2258 goto unlock; 2259 2260 port = br_port_get_rcu(dev); 2261 if (!port || !port->br) 2262 goto unlock; 2263 2264 br = port->br; 2265 2266 switch (proto) { 2267 case ETH_P_IP: 2268 if (!timer_pending(&br->ip4_other_query.timer) || 2269 rcu_dereference(br->ip4_querier.port) == port) 2270 goto unlock; 2271 break; 2272 #if IS_ENABLED(CONFIG_IPV6) 2273 case ETH_P_IPV6: 2274 if (!timer_pending(&br->ip6_other_query.timer) || 2275 rcu_dereference(br->ip6_querier.port) == port) 2276 goto unlock; 2277 break; 2278 #endif 2279 default: 2280 goto unlock; 2281 } 2282 2283 ret = true; 2284 unlock: 2285 rcu_read_unlock(); 2286 return ret; 2287 } 2288 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); 2289 2290 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats, 2291 const struct sk_buff *skb, u8 type, u8 dir) 2292 { 2293 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats); 2294 __be16 proto = skb->protocol; 2295 unsigned int t_len; 2296 2297 u64_stats_update_begin(&pstats->syncp); 2298 switch (proto) { 2299 case htons(ETH_P_IP): 2300 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); 2301 switch (type) { 2302 case IGMP_HOST_MEMBERSHIP_REPORT: 2303 pstats->mstats.igmp_v1reports[dir]++; 2304 break; 2305 case IGMPV2_HOST_MEMBERSHIP_REPORT: 2306 pstats->mstats.igmp_v2reports[dir]++; 2307 break; 2308 case IGMPV3_HOST_MEMBERSHIP_REPORT: 2309 pstats->mstats.igmp_v3reports[dir]++; 2310 break; 2311 case IGMP_HOST_MEMBERSHIP_QUERY: 2312 if (t_len != sizeof(struct igmphdr)) { 2313 pstats->mstats.igmp_v3queries[dir]++; 2314 } else { 2315 unsigned int offset = skb_transport_offset(skb); 2316 struct igmphdr *ih, _ihdr; 2317 2318 ih = skb_header_pointer(skb, offset, 2319 sizeof(_ihdr), &_ihdr); 2320 if (!ih) 2321 break; 2322 if (!ih->code) 2323 pstats->mstats.igmp_v1queries[dir]++; 2324 else 2325 pstats->mstats.igmp_v2queries[dir]++; 2326 } 2327 break; 2328 case IGMP_HOST_LEAVE_MESSAGE: 2329 pstats->mstats.igmp_leaves[dir]++; 2330 break; 2331 } 2332 break; 2333 #if IS_ENABLED(CONFIG_IPV6) 2334 case htons(ETH_P_IPV6): 2335 t_len = ntohs(ipv6_hdr(skb)->payload_len) + 2336 sizeof(struct ipv6hdr); 2337 t_len -= skb_network_header_len(skb); 2338 switch (type) { 2339 case ICMPV6_MGM_REPORT: 2340 pstats->mstats.mld_v1reports[dir]++; 2341 break; 2342 case ICMPV6_MLD2_REPORT: 2343 pstats->mstats.mld_v2reports[dir]++; 2344 break; 2345 case ICMPV6_MGM_QUERY: 2346 if (t_len != sizeof(struct mld_msg)) 2347 pstats->mstats.mld_v2queries[dir]++; 2348 else 2349 pstats->mstats.mld_v1queries[dir]++; 2350 break; 2351 case ICMPV6_MGM_REDUCTION: 2352 pstats->mstats.mld_leaves[dir]++; 2353 break; 2354 } 2355 break; 2356 #endif /* CONFIG_IPV6 */ 2357 } 2358 u64_stats_update_end(&pstats->syncp); 2359 } 2360 2361 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 2362 const struct sk_buff *skb, u8 type, u8 dir) 2363 { 2364 struct bridge_mcast_stats __percpu *stats; 2365 2366 /* if multicast_disabled is true then igmp type can't be set */ 2367 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 2368 return; 2369 2370 if (p) 2371 stats = p->mcast_stats; 2372 else 2373 stats = br->mcast_stats; 2374 if (WARN_ON(!stats)) 2375 return; 2376 2377 br_mcast_stats_add(stats, skb, type, dir); 2378 } 2379 2380 int br_multicast_init_stats(struct net_bridge *br) 2381 { 2382 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 2383 if (!br->mcast_stats) 2384 return -ENOMEM; 2385 2386 return 0; 2387 } 2388 2389 void br_multicast_uninit_stats(struct net_bridge *br) 2390 { 2391 free_percpu(br->mcast_stats); 2392 } 2393 2394 static void mcast_stats_add_dir(u64 *dst, u64 *src) 2395 { 2396 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX]; 2397 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX]; 2398 } 2399 2400 void br_multicast_get_stats(const struct net_bridge *br, 2401 const struct net_bridge_port *p, 2402 struct br_mcast_stats *dest) 2403 { 2404 struct bridge_mcast_stats __percpu *stats; 2405 struct br_mcast_stats tdst; 2406 int i; 2407 2408 memset(dest, 0, sizeof(*dest)); 2409 if (p) 2410 stats = p->mcast_stats; 2411 else 2412 stats = br->mcast_stats; 2413 if (WARN_ON(!stats)) 2414 return; 2415 2416 memset(&tdst, 0, sizeof(tdst)); 2417 for_each_possible_cpu(i) { 2418 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i); 2419 struct br_mcast_stats temp; 2420 unsigned int start; 2421 2422 do { 2423 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); 2424 memcpy(&temp, &cpu_stats->mstats, sizeof(temp)); 2425 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); 2426 2427 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries); 2428 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries); 2429 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries); 2430 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves); 2431 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports); 2432 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports); 2433 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports); 2434 tdst.igmp_parse_errors += temp.igmp_parse_errors; 2435 2436 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries); 2437 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries); 2438 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves); 2439 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports); 2440 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports); 2441 tdst.mld_parse_errors += temp.mld_parse_errors; 2442 } 2443 memcpy(dest, &tdst, sizeof(*dest)); 2444 } 2445 2446 int br_mdb_hash_init(struct net_bridge *br) 2447 { 2448 return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params); 2449 } 2450 2451 void br_mdb_hash_fini(struct net_bridge *br) 2452 { 2453 rhashtable_destroy(&br->mdb_hash_tbl); 2454 } 2455