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 u16 nsrcs; 915 916 ih = igmpv3_report_hdr(skb); 917 num = ntohs(ih->ngrec); 918 len = skb_transport_offset(skb) + sizeof(*ih); 919 920 for (i = 0; i < num; i++) { 921 len += sizeof(*grec); 922 if (!ip_mc_may_pull(skb, len)) 923 return -EINVAL; 924 925 grec = (void *)(skb->data + len - sizeof(*grec)); 926 group = grec->grec_mca; 927 type = grec->grec_type; 928 nsrcs = ntohs(grec->grec_nsrcs); 929 930 len += nsrcs * 4; 931 if (!ip_mc_may_pull(skb, len)) 932 return -EINVAL; 933 934 /* We treat this as an IGMPv2 report for now. */ 935 switch (type) { 936 case IGMPV3_MODE_IS_INCLUDE: 937 case IGMPV3_MODE_IS_EXCLUDE: 938 case IGMPV3_CHANGE_TO_INCLUDE: 939 case IGMPV3_CHANGE_TO_EXCLUDE: 940 case IGMPV3_ALLOW_NEW_SOURCES: 941 case IGMPV3_BLOCK_OLD_SOURCES: 942 break; 943 944 default: 945 continue; 946 } 947 948 src = eth_hdr(skb)->h_source; 949 if ((type == IGMPV3_CHANGE_TO_INCLUDE || 950 type == IGMPV3_MODE_IS_INCLUDE) && 951 nsrcs == 0) { 952 br_ip4_multicast_leave_group(br, port, group, vid, src); 953 } else { 954 err = br_ip4_multicast_add_group(br, port, group, vid, 955 src); 956 if (err) 957 break; 958 } 959 } 960 961 return err; 962 } 963 964 #if IS_ENABLED(CONFIG_IPV6) 965 static int br_ip6_multicast_mld2_report(struct net_bridge *br, 966 struct net_bridge_port *port, 967 struct sk_buff *skb, 968 u16 vid) 969 { 970 unsigned int nsrcs_offset; 971 const unsigned char *src; 972 struct icmp6hdr *icmp6h; 973 struct mld2_grec *grec; 974 unsigned int grec_len; 975 int i; 976 int len; 977 int num; 978 int err = 0; 979 980 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h))) 981 return -EINVAL; 982 983 icmp6h = icmp6_hdr(skb); 984 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); 985 len = skb_transport_offset(skb) + sizeof(*icmp6h); 986 987 for (i = 0; i < num; i++) { 988 __be16 *_nsrcs, __nsrcs; 989 u16 nsrcs; 990 991 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs); 992 993 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < 994 nsrcs_offset + sizeof(_nsrcs)) 995 return -EINVAL; 996 997 _nsrcs = skb_header_pointer(skb, nsrcs_offset, 998 sizeof(__nsrcs), &__nsrcs); 999 if (!_nsrcs) 1000 return -EINVAL; 1001 1002 nsrcs = ntohs(*_nsrcs); 1003 grec_len = struct_size(grec, grec_src, nsrcs); 1004 1005 if (!ipv6_mc_may_pull(skb, len + grec_len)) 1006 return -EINVAL; 1007 1008 grec = (struct mld2_grec *)(skb->data + len); 1009 len += grec_len; 1010 1011 /* We treat these as MLDv1 reports for now. */ 1012 switch (grec->grec_type) { 1013 case MLD2_MODE_IS_INCLUDE: 1014 case MLD2_MODE_IS_EXCLUDE: 1015 case MLD2_CHANGE_TO_INCLUDE: 1016 case MLD2_CHANGE_TO_EXCLUDE: 1017 case MLD2_ALLOW_NEW_SOURCES: 1018 case MLD2_BLOCK_OLD_SOURCES: 1019 break; 1020 1021 default: 1022 continue; 1023 } 1024 1025 src = eth_hdr(skb)->h_source; 1026 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE || 1027 grec->grec_type == MLD2_MODE_IS_INCLUDE) && 1028 nsrcs == 0) { 1029 br_ip6_multicast_leave_group(br, port, &grec->grec_mca, 1030 vid, src); 1031 } else { 1032 err = br_ip6_multicast_add_group(br, port, 1033 &grec->grec_mca, vid, 1034 src); 1035 if (err) 1036 break; 1037 } 1038 } 1039 1040 return err; 1041 } 1042 #endif 1043 1044 static bool br_ip4_multicast_select_querier(struct net_bridge *br, 1045 struct net_bridge_port *port, 1046 __be32 saddr) 1047 { 1048 if (!timer_pending(&br->ip4_own_query.timer) && 1049 !timer_pending(&br->ip4_other_query.timer)) 1050 goto update; 1051 1052 if (!br->ip4_querier.addr.u.ip4) 1053 goto update; 1054 1055 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4)) 1056 goto update; 1057 1058 return false; 1059 1060 update: 1061 br->ip4_querier.addr.u.ip4 = saddr; 1062 1063 /* update protected by general multicast_lock by caller */ 1064 rcu_assign_pointer(br->ip4_querier.port, port); 1065 1066 return true; 1067 } 1068 1069 #if IS_ENABLED(CONFIG_IPV6) 1070 static bool br_ip6_multicast_select_querier(struct net_bridge *br, 1071 struct net_bridge_port *port, 1072 struct in6_addr *saddr) 1073 { 1074 if (!timer_pending(&br->ip6_own_query.timer) && 1075 !timer_pending(&br->ip6_other_query.timer)) 1076 goto update; 1077 1078 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0) 1079 goto update; 1080 1081 return false; 1082 1083 update: 1084 br->ip6_querier.addr.u.ip6 = *saddr; 1085 1086 /* update protected by general multicast_lock by caller */ 1087 rcu_assign_pointer(br->ip6_querier.port, port); 1088 1089 return true; 1090 } 1091 #endif 1092 1093 static bool br_multicast_select_querier(struct net_bridge *br, 1094 struct net_bridge_port *port, 1095 struct br_ip *saddr) 1096 { 1097 switch (saddr->proto) { 1098 case htons(ETH_P_IP): 1099 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4); 1100 #if IS_ENABLED(CONFIG_IPV6) 1101 case htons(ETH_P_IPV6): 1102 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6); 1103 #endif 1104 } 1105 1106 return false; 1107 } 1108 1109 static void 1110 br_multicast_update_query_timer(struct net_bridge *br, 1111 struct bridge_mcast_other_query *query, 1112 unsigned long max_delay) 1113 { 1114 if (!timer_pending(&query->timer)) 1115 query->delay_time = jiffies + max_delay; 1116 1117 mod_timer(&query->timer, jiffies + br->multicast_querier_interval); 1118 } 1119 1120 static void br_port_mc_router_state_change(struct net_bridge_port *p, 1121 bool is_mc_router) 1122 { 1123 struct switchdev_attr attr = { 1124 .orig_dev = p->dev, 1125 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER, 1126 .flags = SWITCHDEV_F_DEFER, 1127 .u.mrouter = is_mc_router, 1128 }; 1129 1130 switchdev_port_attr_set(p->dev, &attr); 1131 } 1132 1133 /* 1134 * Add port to router_list 1135 * list is maintained ordered by pointer value 1136 * and locked by br->multicast_lock and RCU 1137 */ 1138 static void br_multicast_add_router(struct net_bridge *br, 1139 struct net_bridge_port *port) 1140 { 1141 struct net_bridge_port *p; 1142 struct hlist_node *slot = NULL; 1143 1144 if (!hlist_unhashed(&port->rlist)) 1145 return; 1146 1147 hlist_for_each_entry(p, &br->router_list, rlist) { 1148 if ((unsigned long) port >= (unsigned long) p) 1149 break; 1150 slot = &p->rlist; 1151 } 1152 1153 if (slot) 1154 hlist_add_behind_rcu(&port->rlist, slot); 1155 else 1156 hlist_add_head_rcu(&port->rlist, &br->router_list); 1157 br_rtr_notify(br->dev, port, RTM_NEWMDB); 1158 br_port_mc_router_state_change(port, true); 1159 } 1160 1161 static void br_multicast_mark_router(struct net_bridge *br, 1162 struct net_bridge_port *port) 1163 { 1164 unsigned long now = jiffies; 1165 1166 if (!port) { 1167 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) { 1168 if (!timer_pending(&br->multicast_router_timer)) 1169 br_mc_router_state_change(br, true); 1170 mod_timer(&br->multicast_router_timer, 1171 now + br->multicast_querier_interval); 1172 } 1173 return; 1174 } 1175 1176 if (port->multicast_router == MDB_RTR_TYPE_DISABLED || 1177 port->multicast_router == MDB_RTR_TYPE_PERM) 1178 return; 1179 1180 br_multicast_add_router(br, port); 1181 1182 mod_timer(&port->multicast_router_timer, 1183 now + br->multicast_querier_interval); 1184 } 1185 1186 static void br_multicast_query_received(struct net_bridge *br, 1187 struct net_bridge_port *port, 1188 struct bridge_mcast_other_query *query, 1189 struct br_ip *saddr, 1190 unsigned long max_delay) 1191 { 1192 if (!br_multicast_select_querier(br, port, saddr)) 1193 return; 1194 1195 br_multicast_update_query_timer(br, query, max_delay); 1196 br_multicast_mark_router(br, port); 1197 } 1198 1199 static void br_ip4_multicast_query(struct net_bridge *br, 1200 struct net_bridge_port *port, 1201 struct sk_buff *skb, 1202 u16 vid) 1203 { 1204 unsigned int transport_len = ip_transport_len(skb); 1205 const struct iphdr *iph = ip_hdr(skb); 1206 struct igmphdr *ih = igmp_hdr(skb); 1207 struct net_bridge_mdb_entry *mp; 1208 struct igmpv3_query *ih3; 1209 struct net_bridge_port_group *p; 1210 struct net_bridge_port_group __rcu **pp; 1211 struct br_ip saddr; 1212 unsigned long max_delay; 1213 unsigned long now = jiffies; 1214 __be32 group; 1215 1216 spin_lock(&br->multicast_lock); 1217 if (!netif_running(br->dev) || 1218 (port && port->state == BR_STATE_DISABLED)) 1219 goto out; 1220 1221 group = ih->group; 1222 1223 if (transport_len == sizeof(*ih)) { 1224 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); 1225 1226 if (!max_delay) { 1227 max_delay = 10 * HZ; 1228 group = 0; 1229 } 1230 } else if (transport_len >= sizeof(*ih3)) { 1231 ih3 = igmpv3_query_hdr(skb); 1232 if (ih3->nsrcs) 1233 goto out; 1234 1235 max_delay = ih3->code ? 1236 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; 1237 } else { 1238 goto out; 1239 } 1240 1241 if (!group) { 1242 saddr.proto = htons(ETH_P_IP); 1243 saddr.u.ip4 = iph->saddr; 1244 1245 br_multicast_query_received(br, port, &br->ip4_other_query, 1246 &saddr, max_delay); 1247 goto out; 1248 } 1249 1250 mp = br_mdb_ip4_get(br, group, vid); 1251 if (!mp) 1252 goto out; 1253 1254 max_delay *= br->multicast_last_member_count; 1255 1256 if (mp->host_joined && 1257 (timer_pending(&mp->timer) ? 1258 time_after(mp->timer.expires, now + max_delay) : 1259 try_to_del_timer_sync(&mp->timer) >= 0)) 1260 mod_timer(&mp->timer, now + max_delay); 1261 1262 for (pp = &mp->ports; 1263 (p = mlock_dereference(*pp, br)) != NULL; 1264 pp = &p->next) { 1265 if (timer_pending(&p->timer) ? 1266 time_after(p->timer.expires, now + max_delay) : 1267 try_to_del_timer_sync(&p->timer) >= 0) 1268 mod_timer(&p->timer, now + max_delay); 1269 } 1270 1271 out: 1272 spin_unlock(&br->multicast_lock); 1273 } 1274 1275 #if IS_ENABLED(CONFIG_IPV6) 1276 static int br_ip6_multicast_query(struct net_bridge *br, 1277 struct net_bridge_port *port, 1278 struct sk_buff *skb, 1279 u16 vid) 1280 { 1281 unsigned int transport_len = ipv6_transport_len(skb); 1282 struct mld_msg *mld; 1283 struct net_bridge_mdb_entry *mp; 1284 struct mld2_query *mld2q; 1285 struct net_bridge_port_group *p; 1286 struct net_bridge_port_group __rcu **pp; 1287 struct br_ip saddr; 1288 unsigned long max_delay; 1289 unsigned long now = jiffies; 1290 unsigned int offset = skb_transport_offset(skb); 1291 const struct in6_addr *group = NULL; 1292 bool is_general_query; 1293 int err = 0; 1294 1295 spin_lock(&br->multicast_lock); 1296 if (!netif_running(br->dev) || 1297 (port && port->state == BR_STATE_DISABLED)) 1298 goto out; 1299 1300 if (transport_len == sizeof(*mld)) { 1301 if (!pskb_may_pull(skb, offset + sizeof(*mld))) { 1302 err = -EINVAL; 1303 goto out; 1304 } 1305 mld = (struct mld_msg *) icmp6_hdr(skb); 1306 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); 1307 if (max_delay) 1308 group = &mld->mld_mca; 1309 } else { 1310 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) { 1311 err = -EINVAL; 1312 goto out; 1313 } 1314 mld2q = (struct mld2_query *)icmp6_hdr(skb); 1315 if (!mld2q->mld2q_nsrcs) 1316 group = &mld2q->mld2q_mca; 1317 1318 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL); 1319 } 1320 1321 is_general_query = group && ipv6_addr_any(group); 1322 1323 if (is_general_query) { 1324 saddr.proto = htons(ETH_P_IPV6); 1325 saddr.u.ip6 = ipv6_hdr(skb)->saddr; 1326 1327 br_multicast_query_received(br, port, &br->ip6_other_query, 1328 &saddr, max_delay); 1329 goto out; 1330 } else if (!group) { 1331 goto out; 1332 } 1333 1334 mp = br_mdb_ip6_get(br, group, vid); 1335 if (!mp) 1336 goto out; 1337 1338 max_delay *= br->multicast_last_member_count; 1339 if (mp->host_joined && 1340 (timer_pending(&mp->timer) ? 1341 time_after(mp->timer.expires, now + max_delay) : 1342 try_to_del_timer_sync(&mp->timer) >= 0)) 1343 mod_timer(&mp->timer, now + max_delay); 1344 1345 for (pp = &mp->ports; 1346 (p = mlock_dereference(*pp, br)) != NULL; 1347 pp = &p->next) { 1348 if (timer_pending(&p->timer) ? 1349 time_after(p->timer.expires, now + max_delay) : 1350 try_to_del_timer_sync(&p->timer) >= 0) 1351 mod_timer(&p->timer, now + max_delay); 1352 } 1353 1354 out: 1355 spin_unlock(&br->multicast_lock); 1356 return err; 1357 } 1358 #endif 1359 1360 static void 1361 br_multicast_leave_group(struct net_bridge *br, 1362 struct net_bridge_port *port, 1363 struct br_ip *group, 1364 struct bridge_mcast_other_query *other_query, 1365 struct bridge_mcast_own_query *own_query, 1366 const unsigned char *src) 1367 { 1368 struct net_bridge_mdb_entry *mp; 1369 struct net_bridge_port_group *p; 1370 unsigned long now; 1371 unsigned long time; 1372 1373 spin_lock(&br->multicast_lock); 1374 if (!netif_running(br->dev) || 1375 (port && port->state == BR_STATE_DISABLED)) 1376 goto out; 1377 1378 mp = br_mdb_ip_get(br, group); 1379 if (!mp) 1380 goto out; 1381 1382 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) { 1383 struct net_bridge_port_group __rcu **pp; 1384 1385 for (pp = &mp->ports; 1386 (p = mlock_dereference(*pp, br)) != NULL; 1387 pp = &p->next) { 1388 if (!br_port_group_equal(p, port, src)) 1389 continue; 1390 1391 rcu_assign_pointer(*pp, p->next); 1392 hlist_del_init(&p->mglist); 1393 del_timer(&p->timer); 1394 kfree_rcu(p, rcu); 1395 br_mdb_notify(br->dev, port, group, RTM_DELMDB, 1396 p->flags); 1397 1398 if (!mp->ports && !mp->host_joined && 1399 netif_running(br->dev)) 1400 mod_timer(&mp->timer, jiffies); 1401 } 1402 goto out; 1403 } 1404 1405 if (timer_pending(&other_query->timer)) 1406 goto out; 1407 1408 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) { 1409 __br_multicast_send_query(br, port, &mp->addr); 1410 1411 time = jiffies + br->multicast_last_member_count * 1412 br->multicast_last_member_interval; 1413 1414 mod_timer(&own_query->timer, time); 1415 1416 for (p = mlock_dereference(mp->ports, br); 1417 p != NULL; 1418 p = mlock_dereference(p->next, br)) { 1419 if (!br_port_group_equal(p, port, src)) 1420 continue; 1421 1422 if (!hlist_unhashed(&p->mglist) && 1423 (timer_pending(&p->timer) ? 1424 time_after(p->timer.expires, time) : 1425 try_to_del_timer_sync(&p->timer) >= 0)) { 1426 mod_timer(&p->timer, time); 1427 } 1428 1429 break; 1430 } 1431 } 1432 1433 now = jiffies; 1434 time = now + br->multicast_last_member_count * 1435 br->multicast_last_member_interval; 1436 1437 if (!port) { 1438 if (mp->host_joined && 1439 (timer_pending(&mp->timer) ? 1440 time_after(mp->timer.expires, time) : 1441 try_to_del_timer_sync(&mp->timer) >= 0)) { 1442 mod_timer(&mp->timer, time); 1443 } 1444 1445 goto out; 1446 } 1447 1448 for (p = mlock_dereference(mp->ports, br); 1449 p != NULL; 1450 p = mlock_dereference(p->next, br)) { 1451 if (p->port != port) 1452 continue; 1453 1454 if (!hlist_unhashed(&p->mglist) && 1455 (timer_pending(&p->timer) ? 1456 time_after(p->timer.expires, time) : 1457 try_to_del_timer_sync(&p->timer) >= 0)) { 1458 mod_timer(&p->timer, time); 1459 } 1460 1461 break; 1462 } 1463 out: 1464 spin_unlock(&br->multicast_lock); 1465 } 1466 1467 static void br_ip4_multicast_leave_group(struct net_bridge *br, 1468 struct net_bridge_port *port, 1469 __be32 group, 1470 __u16 vid, 1471 const unsigned char *src) 1472 { 1473 struct br_ip br_group; 1474 struct bridge_mcast_own_query *own_query; 1475 1476 if (ipv4_is_local_multicast(group)) 1477 return; 1478 1479 own_query = port ? &port->ip4_own_query : &br->ip4_own_query; 1480 1481 memset(&br_group, 0, sizeof(br_group)); 1482 br_group.u.ip4 = group; 1483 br_group.proto = htons(ETH_P_IP); 1484 br_group.vid = vid; 1485 1486 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query, 1487 own_query, src); 1488 } 1489 1490 #if IS_ENABLED(CONFIG_IPV6) 1491 static void br_ip6_multicast_leave_group(struct net_bridge *br, 1492 struct net_bridge_port *port, 1493 const struct in6_addr *group, 1494 __u16 vid, 1495 const unsigned char *src) 1496 { 1497 struct br_ip br_group; 1498 struct bridge_mcast_own_query *own_query; 1499 1500 if (ipv6_addr_is_ll_all_nodes(group)) 1501 return; 1502 1503 own_query = port ? &port->ip6_own_query : &br->ip6_own_query; 1504 1505 memset(&br_group, 0, sizeof(br_group)); 1506 br_group.u.ip6 = *group; 1507 br_group.proto = htons(ETH_P_IPV6); 1508 br_group.vid = vid; 1509 1510 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query, 1511 own_query, src); 1512 } 1513 #endif 1514 1515 static void br_multicast_err_count(const struct net_bridge *br, 1516 const struct net_bridge_port *p, 1517 __be16 proto) 1518 { 1519 struct bridge_mcast_stats __percpu *stats; 1520 struct bridge_mcast_stats *pstats; 1521 1522 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 1523 return; 1524 1525 if (p) 1526 stats = p->mcast_stats; 1527 else 1528 stats = br->mcast_stats; 1529 if (WARN_ON(!stats)) 1530 return; 1531 1532 pstats = this_cpu_ptr(stats); 1533 1534 u64_stats_update_begin(&pstats->syncp); 1535 switch (proto) { 1536 case htons(ETH_P_IP): 1537 pstats->mstats.igmp_parse_errors++; 1538 break; 1539 #if IS_ENABLED(CONFIG_IPV6) 1540 case htons(ETH_P_IPV6): 1541 pstats->mstats.mld_parse_errors++; 1542 break; 1543 #endif 1544 } 1545 u64_stats_update_end(&pstats->syncp); 1546 } 1547 1548 static void br_multicast_pim(struct net_bridge *br, 1549 struct net_bridge_port *port, 1550 const struct sk_buff *skb) 1551 { 1552 unsigned int offset = skb_transport_offset(skb); 1553 struct pimhdr *pimhdr, _pimhdr; 1554 1555 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr); 1556 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION || 1557 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO) 1558 return; 1559 1560 br_multicast_mark_router(br, port); 1561 } 1562 1563 static int br_ip4_multicast_mrd_rcv(struct net_bridge *br, 1564 struct net_bridge_port *port, 1565 struct sk_buff *skb) 1566 { 1567 if (ip_hdr(skb)->protocol != IPPROTO_IGMP || 1568 igmp_hdr(skb)->type != IGMP_MRDISC_ADV) 1569 return -ENOMSG; 1570 1571 br_multicast_mark_router(br, port); 1572 1573 return 0; 1574 } 1575 1576 static int br_multicast_ipv4_rcv(struct net_bridge *br, 1577 struct net_bridge_port *port, 1578 struct sk_buff *skb, 1579 u16 vid) 1580 { 1581 const unsigned char *src; 1582 struct igmphdr *ih; 1583 int err; 1584 1585 err = ip_mc_check_igmp(skb); 1586 1587 if (err == -ENOMSG) { 1588 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) { 1589 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1590 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) { 1591 if (ip_hdr(skb)->protocol == IPPROTO_PIM) 1592 br_multicast_pim(br, port, skb); 1593 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) { 1594 br_ip4_multicast_mrd_rcv(br, port, skb); 1595 } 1596 1597 return 0; 1598 } else if (err < 0) { 1599 br_multicast_err_count(br, port, skb->protocol); 1600 return err; 1601 } 1602 1603 ih = igmp_hdr(skb); 1604 src = eth_hdr(skb)->h_source; 1605 BR_INPUT_SKB_CB(skb)->igmp = ih->type; 1606 1607 switch (ih->type) { 1608 case IGMP_HOST_MEMBERSHIP_REPORT: 1609 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1610 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1611 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src); 1612 break; 1613 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1614 err = br_ip4_multicast_igmp3_report(br, port, skb, vid); 1615 break; 1616 case IGMP_HOST_MEMBERSHIP_QUERY: 1617 br_ip4_multicast_query(br, port, skb, vid); 1618 break; 1619 case IGMP_HOST_LEAVE_MESSAGE: 1620 br_ip4_multicast_leave_group(br, port, ih->group, vid, src); 1621 break; 1622 } 1623 1624 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp, 1625 BR_MCAST_DIR_RX); 1626 1627 return err; 1628 } 1629 1630 #if IS_ENABLED(CONFIG_IPV6) 1631 static int br_ip6_multicast_mrd_rcv(struct net_bridge *br, 1632 struct net_bridge_port *port, 1633 struct sk_buff *skb) 1634 { 1635 int ret; 1636 1637 if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6) 1638 return -ENOMSG; 1639 1640 ret = ipv6_mc_check_icmpv6(skb); 1641 if (ret < 0) 1642 return ret; 1643 1644 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV) 1645 return -ENOMSG; 1646 1647 br_multicast_mark_router(br, port); 1648 1649 return 0; 1650 } 1651 1652 static int br_multicast_ipv6_rcv(struct net_bridge *br, 1653 struct net_bridge_port *port, 1654 struct sk_buff *skb, 1655 u16 vid) 1656 { 1657 const unsigned char *src; 1658 struct mld_msg *mld; 1659 int err; 1660 1661 err = ipv6_mc_check_mld(skb); 1662 1663 if (err == -ENOMSG) { 1664 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr)) 1665 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1666 1667 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) { 1668 err = br_ip6_multicast_mrd_rcv(br, port, skb); 1669 1670 if (err < 0 && err != -ENOMSG) { 1671 br_multicast_err_count(br, port, skb->protocol); 1672 return err; 1673 } 1674 } 1675 1676 return 0; 1677 } else if (err < 0) { 1678 br_multicast_err_count(br, port, skb->protocol); 1679 return err; 1680 } 1681 1682 mld = (struct mld_msg *)skb_transport_header(skb); 1683 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type; 1684 1685 switch (mld->mld_type) { 1686 case ICMPV6_MGM_REPORT: 1687 src = eth_hdr(skb)->h_source; 1688 BR_INPUT_SKB_CB(skb)->mrouters_only = 1; 1689 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid, 1690 src); 1691 break; 1692 case ICMPV6_MLD2_REPORT: 1693 err = br_ip6_multicast_mld2_report(br, port, skb, vid); 1694 break; 1695 case ICMPV6_MGM_QUERY: 1696 err = br_ip6_multicast_query(br, port, skb, vid); 1697 break; 1698 case ICMPV6_MGM_REDUCTION: 1699 src = eth_hdr(skb)->h_source; 1700 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src); 1701 break; 1702 } 1703 1704 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp, 1705 BR_MCAST_DIR_RX); 1706 1707 return err; 1708 } 1709 #endif 1710 1711 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 1712 struct sk_buff *skb, u16 vid) 1713 { 1714 int ret = 0; 1715 1716 BR_INPUT_SKB_CB(skb)->igmp = 0; 1717 BR_INPUT_SKB_CB(skb)->mrouters_only = 0; 1718 1719 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1720 return 0; 1721 1722 switch (skb->protocol) { 1723 case htons(ETH_P_IP): 1724 ret = br_multicast_ipv4_rcv(br, port, skb, vid); 1725 break; 1726 #if IS_ENABLED(CONFIG_IPV6) 1727 case htons(ETH_P_IPV6): 1728 ret = br_multicast_ipv6_rcv(br, port, skb, vid); 1729 break; 1730 #endif 1731 } 1732 1733 return ret; 1734 } 1735 1736 static void br_multicast_query_expired(struct net_bridge *br, 1737 struct bridge_mcast_own_query *query, 1738 struct bridge_mcast_querier *querier) 1739 { 1740 spin_lock(&br->multicast_lock); 1741 if (query->startup_sent < br->multicast_startup_query_count) 1742 query->startup_sent++; 1743 1744 RCU_INIT_POINTER(querier->port, NULL); 1745 br_multicast_send_query(br, NULL, query); 1746 spin_unlock(&br->multicast_lock); 1747 } 1748 1749 static void br_ip4_multicast_query_expired(struct timer_list *t) 1750 { 1751 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer); 1752 1753 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier); 1754 } 1755 1756 #if IS_ENABLED(CONFIG_IPV6) 1757 static void br_ip6_multicast_query_expired(struct timer_list *t) 1758 { 1759 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer); 1760 1761 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier); 1762 } 1763 #endif 1764 1765 void br_multicast_init(struct net_bridge *br) 1766 { 1767 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX; 1768 1769 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1770 br->multicast_last_member_count = 2; 1771 br->multicast_startup_query_count = 2; 1772 1773 br->multicast_last_member_interval = HZ; 1774 br->multicast_query_response_interval = 10 * HZ; 1775 br->multicast_startup_query_interval = 125 * HZ / 4; 1776 br->multicast_query_interval = 125 * HZ; 1777 br->multicast_querier_interval = 255 * HZ; 1778 br->multicast_membership_interval = 260 * HZ; 1779 1780 br->ip4_other_query.delay_time = 0; 1781 br->ip4_querier.port = NULL; 1782 br->multicast_igmp_version = 2; 1783 #if IS_ENABLED(CONFIG_IPV6) 1784 br->multicast_mld_version = 1; 1785 br->ip6_other_query.delay_time = 0; 1786 br->ip6_querier.port = NULL; 1787 #endif 1788 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true); 1789 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true); 1790 1791 spin_lock_init(&br->multicast_lock); 1792 timer_setup(&br->multicast_router_timer, 1793 br_multicast_local_router_expired, 0); 1794 timer_setup(&br->ip4_other_query.timer, 1795 br_ip4_multicast_querier_expired, 0); 1796 timer_setup(&br->ip4_own_query.timer, 1797 br_ip4_multicast_query_expired, 0); 1798 #if IS_ENABLED(CONFIG_IPV6) 1799 timer_setup(&br->ip6_other_query.timer, 1800 br_ip6_multicast_querier_expired, 0); 1801 timer_setup(&br->ip6_own_query.timer, 1802 br_ip6_multicast_query_expired, 0); 1803 #endif 1804 INIT_HLIST_HEAD(&br->mdb_list); 1805 } 1806 1807 static void br_ip4_multicast_join_snoopers(struct net_bridge *br) 1808 { 1809 struct in_device *in_dev = in_dev_get(br->dev); 1810 1811 if (!in_dev) 1812 return; 1813 1814 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 1815 in_dev_put(in_dev); 1816 } 1817 1818 #if IS_ENABLED(CONFIG_IPV6) 1819 static void br_ip6_multicast_join_snoopers(struct net_bridge *br) 1820 { 1821 struct in6_addr addr; 1822 1823 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 1824 ipv6_dev_mc_inc(br->dev, &addr); 1825 } 1826 #else 1827 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br) 1828 { 1829 } 1830 #endif 1831 1832 static void br_multicast_join_snoopers(struct net_bridge *br) 1833 { 1834 br_ip4_multicast_join_snoopers(br); 1835 br_ip6_multicast_join_snoopers(br); 1836 } 1837 1838 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br) 1839 { 1840 struct in_device *in_dev = in_dev_get(br->dev); 1841 1842 if (WARN_ON(!in_dev)) 1843 return; 1844 1845 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC); 1846 in_dev_put(in_dev); 1847 } 1848 1849 #if IS_ENABLED(CONFIG_IPV6) 1850 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 1851 { 1852 struct in6_addr addr; 1853 1854 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a)); 1855 ipv6_dev_mc_dec(br->dev, &addr); 1856 } 1857 #else 1858 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br) 1859 { 1860 } 1861 #endif 1862 1863 static void br_multicast_leave_snoopers(struct net_bridge *br) 1864 { 1865 br_ip4_multicast_leave_snoopers(br); 1866 br_ip6_multicast_leave_snoopers(br); 1867 } 1868 1869 static void __br_multicast_open(struct net_bridge *br, 1870 struct bridge_mcast_own_query *query) 1871 { 1872 query->startup_sent = 0; 1873 1874 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1875 return; 1876 1877 mod_timer(&query->timer, jiffies); 1878 } 1879 1880 void br_multicast_open(struct net_bridge *br) 1881 { 1882 if (br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1883 br_multicast_join_snoopers(br); 1884 1885 __br_multicast_open(br, &br->ip4_own_query); 1886 #if IS_ENABLED(CONFIG_IPV6) 1887 __br_multicast_open(br, &br->ip6_own_query); 1888 #endif 1889 } 1890 1891 void br_multicast_stop(struct net_bridge *br) 1892 { 1893 del_timer_sync(&br->multicast_router_timer); 1894 del_timer_sync(&br->ip4_other_query.timer); 1895 del_timer_sync(&br->ip4_own_query.timer); 1896 #if IS_ENABLED(CONFIG_IPV6) 1897 del_timer_sync(&br->ip6_other_query.timer); 1898 del_timer_sync(&br->ip6_own_query.timer); 1899 #endif 1900 1901 if (br_opt_get(br, BROPT_MULTICAST_ENABLED)) 1902 br_multicast_leave_snoopers(br); 1903 } 1904 1905 void br_multicast_dev_del(struct net_bridge *br) 1906 { 1907 struct net_bridge_mdb_entry *mp; 1908 struct hlist_node *tmp; 1909 1910 spin_lock_bh(&br->multicast_lock); 1911 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) { 1912 del_timer(&mp->timer); 1913 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode, 1914 br_mdb_rht_params); 1915 hlist_del_rcu(&mp->mdb_node); 1916 kfree_rcu(mp, rcu); 1917 } 1918 spin_unlock_bh(&br->multicast_lock); 1919 1920 rcu_barrier(); 1921 } 1922 1923 int br_multicast_set_router(struct net_bridge *br, unsigned long val) 1924 { 1925 int err = -EINVAL; 1926 1927 spin_lock_bh(&br->multicast_lock); 1928 1929 switch (val) { 1930 case MDB_RTR_TYPE_DISABLED: 1931 case MDB_RTR_TYPE_PERM: 1932 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM); 1933 del_timer(&br->multicast_router_timer); 1934 br->multicast_router = val; 1935 err = 0; 1936 break; 1937 case MDB_RTR_TYPE_TEMP_QUERY: 1938 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY) 1939 br_mc_router_state_change(br, false); 1940 br->multicast_router = val; 1941 err = 0; 1942 break; 1943 } 1944 1945 spin_unlock_bh(&br->multicast_lock); 1946 1947 return err; 1948 } 1949 1950 static void __del_port_router(struct net_bridge_port *p) 1951 { 1952 if (hlist_unhashed(&p->rlist)) 1953 return; 1954 hlist_del_init_rcu(&p->rlist); 1955 br_rtr_notify(p->br->dev, p, RTM_DELMDB); 1956 br_port_mc_router_state_change(p, false); 1957 1958 /* don't allow timer refresh */ 1959 if (p->multicast_router == MDB_RTR_TYPE_TEMP) 1960 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1961 } 1962 1963 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) 1964 { 1965 struct net_bridge *br = p->br; 1966 unsigned long now = jiffies; 1967 int err = -EINVAL; 1968 1969 spin_lock(&br->multicast_lock); 1970 if (p->multicast_router == val) { 1971 /* Refresh the temp router port timer */ 1972 if (p->multicast_router == MDB_RTR_TYPE_TEMP) 1973 mod_timer(&p->multicast_router_timer, 1974 now + br->multicast_querier_interval); 1975 err = 0; 1976 goto unlock; 1977 } 1978 switch (val) { 1979 case MDB_RTR_TYPE_DISABLED: 1980 p->multicast_router = MDB_RTR_TYPE_DISABLED; 1981 __del_port_router(p); 1982 del_timer(&p->multicast_router_timer); 1983 break; 1984 case MDB_RTR_TYPE_TEMP_QUERY: 1985 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; 1986 __del_port_router(p); 1987 break; 1988 case MDB_RTR_TYPE_PERM: 1989 p->multicast_router = MDB_RTR_TYPE_PERM; 1990 del_timer(&p->multicast_router_timer); 1991 br_multicast_add_router(br, p); 1992 break; 1993 case MDB_RTR_TYPE_TEMP: 1994 p->multicast_router = MDB_RTR_TYPE_TEMP; 1995 br_multicast_mark_router(br, p); 1996 break; 1997 default: 1998 goto unlock; 1999 } 2000 err = 0; 2001 unlock: 2002 spin_unlock(&br->multicast_lock); 2003 2004 return err; 2005 } 2006 2007 static void br_multicast_start_querier(struct net_bridge *br, 2008 struct bridge_mcast_own_query *query) 2009 { 2010 struct net_bridge_port *port; 2011 2012 __br_multicast_open(br, query); 2013 2014 rcu_read_lock(); 2015 list_for_each_entry_rcu(port, &br->port_list, list) { 2016 if (port->state == BR_STATE_DISABLED || 2017 port->state == BR_STATE_BLOCKING) 2018 continue; 2019 2020 if (query == &br->ip4_own_query) 2021 br_multicast_enable(&port->ip4_own_query); 2022 #if IS_ENABLED(CONFIG_IPV6) 2023 else 2024 br_multicast_enable(&port->ip6_own_query); 2025 #endif 2026 } 2027 rcu_read_unlock(); 2028 } 2029 2030 int br_multicast_toggle(struct net_bridge *br, unsigned long val) 2031 { 2032 struct net_bridge_port *port; 2033 2034 spin_lock_bh(&br->multicast_lock); 2035 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val) 2036 goto unlock; 2037 2038 br_mc_disabled_update(br->dev, val); 2039 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val); 2040 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) { 2041 br_multicast_leave_snoopers(br); 2042 goto unlock; 2043 } 2044 2045 if (!netif_running(br->dev)) 2046 goto unlock; 2047 2048 br_multicast_open(br); 2049 list_for_each_entry(port, &br->port_list, list) 2050 __br_multicast_enable_port(port); 2051 2052 unlock: 2053 spin_unlock_bh(&br->multicast_lock); 2054 2055 return 0; 2056 } 2057 2058 bool br_multicast_enabled(const struct net_device *dev) 2059 { 2060 struct net_bridge *br = netdev_priv(dev); 2061 2062 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED); 2063 } 2064 EXPORT_SYMBOL_GPL(br_multicast_enabled); 2065 2066 bool br_multicast_router(const struct net_device *dev) 2067 { 2068 struct net_bridge *br = netdev_priv(dev); 2069 bool is_router; 2070 2071 spin_lock_bh(&br->multicast_lock); 2072 is_router = br_multicast_is_router(br); 2073 spin_unlock_bh(&br->multicast_lock); 2074 return is_router; 2075 } 2076 EXPORT_SYMBOL_GPL(br_multicast_router); 2077 2078 int br_multicast_set_querier(struct net_bridge *br, unsigned long val) 2079 { 2080 unsigned long max_delay; 2081 2082 val = !!val; 2083 2084 spin_lock_bh(&br->multicast_lock); 2085 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val) 2086 goto unlock; 2087 2088 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val); 2089 if (!val) 2090 goto unlock; 2091 2092 max_delay = br->multicast_query_response_interval; 2093 2094 if (!timer_pending(&br->ip4_other_query.timer)) 2095 br->ip4_other_query.delay_time = jiffies + max_delay; 2096 2097 br_multicast_start_querier(br, &br->ip4_own_query); 2098 2099 #if IS_ENABLED(CONFIG_IPV6) 2100 if (!timer_pending(&br->ip6_other_query.timer)) 2101 br->ip6_other_query.delay_time = jiffies + max_delay; 2102 2103 br_multicast_start_querier(br, &br->ip6_own_query); 2104 #endif 2105 2106 unlock: 2107 spin_unlock_bh(&br->multicast_lock); 2108 2109 return 0; 2110 } 2111 2112 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val) 2113 { 2114 /* Currently we support only version 2 and 3 */ 2115 switch (val) { 2116 case 2: 2117 case 3: 2118 break; 2119 default: 2120 return -EINVAL; 2121 } 2122 2123 spin_lock_bh(&br->multicast_lock); 2124 br->multicast_igmp_version = val; 2125 spin_unlock_bh(&br->multicast_lock); 2126 2127 return 0; 2128 } 2129 2130 #if IS_ENABLED(CONFIG_IPV6) 2131 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val) 2132 { 2133 /* Currently we support version 1 and 2 */ 2134 switch (val) { 2135 case 1: 2136 case 2: 2137 break; 2138 default: 2139 return -EINVAL; 2140 } 2141 2142 spin_lock_bh(&br->multicast_lock); 2143 br->multicast_mld_version = val; 2144 spin_unlock_bh(&br->multicast_lock); 2145 2146 return 0; 2147 } 2148 #endif 2149 2150 /** 2151 * br_multicast_list_adjacent - Returns snooped multicast addresses 2152 * @dev: The bridge port adjacent to which to retrieve addresses 2153 * @br_ip_list: The list to store found, snooped multicast IP addresses in 2154 * 2155 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast 2156 * snooping feature on all bridge ports of dev's bridge device, excluding 2157 * the addresses from dev itself. 2158 * 2159 * Returns the number of items added to br_ip_list. 2160 * 2161 * Notes: 2162 * - br_ip_list needs to be initialized by caller 2163 * - br_ip_list might contain duplicates in the end 2164 * (needs to be taken care of by caller) 2165 * - br_ip_list needs to be freed by caller 2166 */ 2167 int br_multicast_list_adjacent(struct net_device *dev, 2168 struct list_head *br_ip_list) 2169 { 2170 struct net_bridge *br; 2171 struct net_bridge_port *port; 2172 struct net_bridge_port_group *group; 2173 struct br_ip_list *entry; 2174 int count = 0; 2175 2176 rcu_read_lock(); 2177 if (!br_ip_list || !netif_is_bridge_port(dev)) 2178 goto unlock; 2179 2180 port = br_port_get_rcu(dev); 2181 if (!port || !port->br) 2182 goto unlock; 2183 2184 br = port->br; 2185 2186 list_for_each_entry_rcu(port, &br->port_list, list) { 2187 if (!port->dev || port->dev == dev) 2188 continue; 2189 2190 hlist_for_each_entry_rcu(group, &port->mglist, mglist) { 2191 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 2192 if (!entry) 2193 goto unlock; 2194 2195 entry->addr = group->addr; 2196 list_add(&entry->list, br_ip_list); 2197 count++; 2198 } 2199 } 2200 2201 unlock: 2202 rcu_read_unlock(); 2203 return count; 2204 } 2205 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent); 2206 2207 /** 2208 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge 2209 * @dev: The bridge port providing the bridge on which to check for a querier 2210 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 2211 * 2212 * Checks whether the given interface has a bridge on top and if so returns 2213 * true if a valid querier exists anywhere on the bridged link layer. 2214 * Otherwise returns false. 2215 */ 2216 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto) 2217 { 2218 struct net_bridge *br; 2219 struct net_bridge_port *port; 2220 struct ethhdr eth; 2221 bool ret = false; 2222 2223 rcu_read_lock(); 2224 if (!netif_is_bridge_port(dev)) 2225 goto unlock; 2226 2227 port = br_port_get_rcu(dev); 2228 if (!port || !port->br) 2229 goto unlock; 2230 2231 br = port->br; 2232 2233 memset(ð, 0, sizeof(eth)); 2234 eth.h_proto = htons(proto); 2235 2236 ret = br_multicast_querier_exists(br, ð); 2237 2238 unlock: 2239 rcu_read_unlock(); 2240 return ret; 2241 } 2242 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere); 2243 2244 /** 2245 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port 2246 * @dev: The bridge port adjacent to which to check for a querier 2247 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6 2248 * 2249 * Checks whether the given interface has a bridge on top and if so returns 2250 * true if a selected querier is behind one of the other ports of this 2251 * bridge. Otherwise returns false. 2252 */ 2253 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) 2254 { 2255 struct net_bridge *br; 2256 struct net_bridge_port *port; 2257 bool ret = false; 2258 2259 rcu_read_lock(); 2260 if (!netif_is_bridge_port(dev)) 2261 goto unlock; 2262 2263 port = br_port_get_rcu(dev); 2264 if (!port || !port->br) 2265 goto unlock; 2266 2267 br = port->br; 2268 2269 switch (proto) { 2270 case ETH_P_IP: 2271 if (!timer_pending(&br->ip4_other_query.timer) || 2272 rcu_dereference(br->ip4_querier.port) == port) 2273 goto unlock; 2274 break; 2275 #if IS_ENABLED(CONFIG_IPV6) 2276 case ETH_P_IPV6: 2277 if (!timer_pending(&br->ip6_other_query.timer) || 2278 rcu_dereference(br->ip6_querier.port) == port) 2279 goto unlock; 2280 break; 2281 #endif 2282 default: 2283 goto unlock; 2284 } 2285 2286 ret = true; 2287 unlock: 2288 rcu_read_unlock(); 2289 return ret; 2290 } 2291 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); 2292 2293 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats, 2294 const struct sk_buff *skb, u8 type, u8 dir) 2295 { 2296 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats); 2297 __be16 proto = skb->protocol; 2298 unsigned int t_len; 2299 2300 u64_stats_update_begin(&pstats->syncp); 2301 switch (proto) { 2302 case htons(ETH_P_IP): 2303 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); 2304 switch (type) { 2305 case IGMP_HOST_MEMBERSHIP_REPORT: 2306 pstats->mstats.igmp_v1reports[dir]++; 2307 break; 2308 case IGMPV2_HOST_MEMBERSHIP_REPORT: 2309 pstats->mstats.igmp_v2reports[dir]++; 2310 break; 2311 case IGMPV3_HOST_MEMBERSHIP_REPORT: 2312 pstats->mstats.igmp_v3reports[dir]++; 2313 break; 2314 case IGMP_HOST_MEMBERSHIP_QUERY: 2315 if (t_len != sizeof(struct igmphdr)) { 2316 pstats->mstats.igmp_v3queries[dir]++; 2317 } else { 2318 unsigned int offset = skb_transport_offset(skb); 2319 struct igmphdr *ih, _ihdr; 2320 2321 ih = skb_header_pointer(skb, offset, 2322 sizeof(_ihdr), &_ihdr); 2323 if (!ih) 2324 break; 2325 if (!ih->code) 2326 pstats->mstats.igmp_v1queries[dir]++; 2327 else 2328 pstats->mstats.igmp_v2queries[dir]++; 2329 } 2330 break; 2331 case IGMP_HOST_LEAVE_MESSAGE: 2332 pstats->mstats.igmp_leaves[dir]++; 2333 break; 2334 } 2335 break; 2336 #if IS_ENABLED(CONFIG_IPV6) 2337 case htons(ETH_P_IPV6): 2338 t_len = ntohs(ipv6_hdr(skb)->payload_len) + 2339 sizeof(struct ipv6hdr); 2340 t_len -= skb_network_header_len(skb); 2341 switch (type) { 2342 case ICMPV6_MGM_REPORT: 2343 pstats->mstats.mld_v1reports[dir]++; 2344 break; 2345 case ICMPV6_MLD2_REPORT: 2346 pstats->mstats.mld_v2reports[dir]++; 2347 break; 2348 case ICMPV6_MGM_QUERY: 2349 if (t_len != sizeof(struct mld_msg)) 2350 pstats->mstats.mld_v2queries[dir]++; 2351 else 2352 pstats->mstats.mld_v1queries[dir]++; 2353 break; 2354 case ICMPV6_MGM_REDUCTION: 2355 pstats->mstats.mld_leaves[dir]++; 2356 break; 2357 } 2358 break; 2359 #endif /* CONFIG_IPV6 */ 2360 } 2361 u64_stats_update_end(&pstats->syncp); 2362 } 2363 2364 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 2365 const struct sk_buff *skb, u8 type, u8 dir) 2366 { 2367 struct bridge_mcast_stats __percpu *stats; 2368 2369 /* if multicast_disabled is true then igmp type can't be set */ 2370 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) 2371 return; 2372 2373 if (p) 2374 stats = p->mcast_stats; 2375 else 2376 stats = br->mcast_stats; 2377 if (WARN_ON(!stats)) 2378 return; 2379 2380 br_mcast_stats_add(stats, skb, type, dir); 2381 } 2382 2383 int br_multicast_init_stats(struct net_bridge *br) 2384 { 2385 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats); 2386 if (!br->mcast_stats) 2387 return -ENOMEM; 2388 2389 return 0; 2390 } 2391 2392 void br_multicast_uninit_stats(struct net_bridge *br) 2393 { 2394 free_percpu(br->mcast_stats); 2395 } 2396 2397 static void mcast_stats_add_dir(u64 *dst, u64 *src) 2398 { 2399 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX]; 2400 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX]; 2401 } 2402 2403 void br_multicast_get_stats(const struct net_bridge *br, 2404 const struct net_bridge_port *p, 2405 struct br_mcast_stats *dest) 2406 { 2407 struct bridge_mcast_stats __percpu *stats; 2408 struct br_mcast_stats tdst; 2409 int i; 2410 2411 memset(dest, 0, sizeof(*dest)); 2412 if (p) 2413 stats = p->mcast_stats; 2414 else 2415 stats = br->mcast_stats; 2416 if (WARN_ON(!stats)) 2417 return; 2418 2419 memset(&tdst, 0, sizeof(tdst)); 2420 for_each_possible_cpu(i) { 2421 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i); 2422 struct br_mcast_stats temp; 2423 unsigned int start; 2424 2425 do { 2426 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); 2427 memcpy(&temp, &cpu_stats->mstats, sizeof(temp)); 2428 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); 2429 2430 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries); 2431 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries); 2432 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries); 2433 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves); 2434 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports); 2435 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports); 2436 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports); 2437 tdst.igmp_parse_errors += temp.igmp_parse_errors; 2438 2439 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries); 2440 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries); 2441 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves); 2442 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports); 2443 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports); 2444 tdst.mld_parse_errors += temp.mld_parse_errors; 2445 } 2446 memcpy(dest, &tdst, sizeof(*dest)); 2447 } 2448 2449 int br_mdb_hash_init(struct net_bridge *br) 2450 { 2451 return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params); 2452 } 2453 2454 void br_mdb_hash_fini(struct net_bridge *br) 2455 { 2456 rhashtable_destroy(&br->mdb_hash_tbl); 2457 } 2458