1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/err.h> 3 #include <linux/igmp.h> 4 #include <linux/kernel.h> 5 #include <linux/netdevice.h> 6 #include <linux/rculist.h> 7 #include <linux/skbuff.h> 8 #include <linux/if_ether.h> 9 #include <net/ip.h> 10 #include <net/netlink.h> 11 #include <net/switchdev.h> 12 #if IS_ENABLED(CONFIG_IPV6) 13 #include <net/ipv6.h> 14 #include <net/addrconf.h> 15 #endif 16 17 #include "br_private.h" 18 19 static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb, 20 struct net_device *dev) 21 { 22 struct net_bridge *br = netdev_priv(dev); 23 struct net_bridge_port *p; 24 struct nlattr *nest, *port_nest; 25 26 if (!br->multicast_router || hlist_empty(&br->router_list)) 27 return 0; 28 29 nest = nla_nest_start(skb, MDBA_ROUTER); 30 if (nest == NULL) 31 return -EMSGSIZE; 32 33 hlist_for_each_entry_rcu(p, &br->router_list, rlist) { 34 if (!p) 35 continue; 36 port_nest = nla_nest_start(skb, MDBA_ROUTER_PORT); 37 if (!port_nest) 38 goto fail; 39 if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) || 40 nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER, 41 br_timer_value(&p->multicast_router_timer)) || 42 nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE, 43 p->multicast_router)) { 44 nla_nest_cancel(skb, port_nest); 45 goto fail; 46 } 47 nla_nest_end(skb, port_nest); 48 } 49 50 nla_nest_end(skb, nest); 51 return 0; 52 fail: 53 nla_nest_cancel(skb, nest); 54 return -EMSGSIZE; 55 } 56 57 static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags) 58 { 59 e->state = flags & MDB_PG_FLAGS_PERMANENT; 60 e->flags = 0; 61 if (flags & MDB_PG_FLAGS_OFFLOAD) 62 e->flags |= MDB_FLAGS_OFFLOAD; 63 } 64 65 static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip) 66 { 67 memset(ip, 0, sizeof(struct br_ip)); 68 ip->vid = entry->vid; 69 ip->proto = entry->addr.proto; 70 if (ip->proto == htons(ETH_P_IP)) 71 ip->u.ip4 = entry->addr.u.ip4; 72 #if IS_ENABLED(CONFIG_IPV6) 73 else 74 ip->u.ip6 = entry->addr.u.ip6; 75 #endif 76 } 77 78 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb, 79 struct net_device *dev) 80 { 81 struct net_bridge *br = netdev_priv(dev); 82 struct net_bridge_mdb_htable *mdb; 83 struct nlattr *nest, *nest2; 84 int i, err = 0; 85 int idx = 0, s_idx = cb->args[1]; 86 87 if (br->multicast_disabled) 88 return 0; 89 90 mdb = rcu_dereference(br->mdb); 91 if (!mdb) 92 return 0; 93 94 nest = nla_nest_start(skb, MDBA_MDB); 95 if (nest == NULL) 96 return -EMSGSIZE; 97 98 for (i = 0; i < mdb->max; i++) { 99 struct net_bridge_mdb_entry *mp; 100 struct net_bridge_port_group *p; 101 struct net_bridge_port_group __rcu **pp; 102 struct net_bridge_port *port; 103 104 hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) { 105 if (idx < s_idx) 106 goto skip; 107 108 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY); 109 if (nest2 == NULL) { 110 err = -EMSGSIZE; 111 goto out; 112 } 113 114 for (pp = &mp->ports; 115 (p = rcu_dereference(*pp)) != NULL; 116 pp = &p->next) { 117 struct nlattr *nest_ent; 118 struct br_mdb_entry e; 119 120 port = p->port; 121 if (!port) 122 continue; 123 124 memset(&e, 0, sizeof(e)); 125 e.ifindex = port->dev->ifindex; 126 e.vid = p->addr.vid; 127 __mdb_entry_fill_flags(&e, p->flags); 128 if (p->addr.proto == htons(ETH_P_IP)) 129 e.addr.u.ip4 = p->addr.u.ip4; 130 #if IS_ENABLED(CONFIG_IPV6) 131 if (p->addr.proto == htons(ETH_P_IPV6)) 132 e.addr.u.ip6 = p->addr.u.ip6; 133 #endif 134 e.addr.proto = p->addr.proto; 135 nest_ent = nla_nest_start(skb, 136 MDBA_MDB_ENTRY_INFO); 137 if (!nest_ent) { 138 nla_nest_cancel(skb, nest2); 139 err = -EMSGSIZE; 140 goto out; 141 } 142 if (nla_put_nohdr(skb, sizeof(e), &e) || 143 nla_put_u32(skb, 144 MDBA_MDB_EATTR_TIMER, 145 br_timer_value(&p->timer))) { 146 nla_nest_cancel(skb, nest_ent); 147 nla_nest_cancel(skb, nest2); 148 err = -EMSGSIZE; 149 goto out; 150 } 151 nla_nest_end(skb, nest_ent); 152 } 153 nla_nest_end(skb, nest2); 154 skip: 155 idx++; 156 } 157 } 158 159 out: 160 cb->args[1] = idx; 161 nla_nest_end(skb, nest); 162 return err; 163 } 164 165 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb) 166 { 167 struct net_device *dev; 168 struct net *net = sock_net(skb->sk); 169 struct nlmsghdr *nlh = NULL; 170 int idx = 0, s_idx; 171 172 s_idx = cb->args[0]; 173 174 rcu_read_lock(); 175 176 /* In theory this could be wrapped to 0... */ 177 cb->seq = net->dev_base_seq + br_mdb_rehash_seq; 178 179 for_each_netdev_rcu(net, dev) { 180 if (dev->priv_flags & IFF_EBRIDGE) { 181 struct br_port_msg *bpm; 182 183 if (idx < s_idx) 184 goto skip; 185 186 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, 187 cb->nlh->nlmsg_seq, RTM_GETMDB, 188 sizeof(*bpm), NLM_F_MULTI); 189 if (nlh == NULL) 190 break; 191 192 bpm = nlmsg_data(nlh); 193 memset(bpm, 0, sizeof(*bpm)); 194 bpm->ifindex = dev->ifindex; 195 if (br_mdb_fill_info(skb, cb, dev) < 0) 196 goto out; 197 if (br_rports_fill_info(skb, cb, dev) < 0) 198 goto out; 199 200 cb->args[1] = 0; 201 nlmsg_end(skb, nlh); 202 skip: 203 idx++; 204 } 205 } 206 207 out: 208 if (nlh) 209 nlmsg_end(skb, nlh); 210 rcu_read_unlock(); 211 cb->args[0] = idx; 212 return skb->len; 213 } 214 215 static int nlmsg_populate_mdb_fill(struct sk_buff *skb, 216 struct net_device *dev, 217 struct br_mdb_entry *entry, u32 pid, 218 u32 seq, int type, unsigned int flags) 219 { 220 struct nlmsghdr *nlh; 221 struct br_port_msg *bpm; 222 struct nlattr *nest, *nest2; 223 224 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0); 225 if (!nlh) 226 return -EMSGSIZE; 227 228 bpm = nlmsg_data(nlh); 229 memset(bpm, 0, sizeof(*bpm)); 230 bpm->family = AF_BRIDGE; 231 bpm->ifindex = dev->ifindex; 232 nest = nla_nest_start(skb, MDBA_MDB); 233 if (nest == NULL) 234 goto cancel; 235 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY); 236 if (nest2 == NULL) 237 goto end; 238 239 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry)) 240 goto end; 241 242 nla_nest_end(skb, nest2); 243 nla_nest_end(skb, nest); 244 nlmsg_end(skb, nlh); 245 return 0; 246 247 end: 248 nla_nest_end(skb, nest); 249 cancel: 250 nlmsg_cancel(skb, nlh); 251 return -EMSGSIZE; 252 } 253 254 static inline size_t rtnl_mdb_nlmsg_size(void) 255 { 256 return NLMSG_ALIGN(sizeof(struct br_port_msg)) 257 + nla_total_size(sizeof(struct br_mdb_entry)); 258 } 259 260 struct br_mdb_complete_info { 261 struct net_bridge_port *port; 262 struct br_ip ip; 263 }; 264 265 static void br_mdb_complete(struct net_device *dev, int err, void *priv) 266 { 267 struct br_mdb_complete_info *data = priv; 268 struct net_bridge_port_group __rcu **pp; 269 struct net_bridge_port_group *p; 270 struct net_bridge_mdb_htable *mdb; 271 struct net_bridge_mdb_entry *mp; 272 struct net_bridge_port *port = data->port; 273 struct net_bridge *br = port->br; 274 275 if (err) 276 goto err; 277 278 spin_lock_bh(&br->multicast_lock); 279 mdb = mlock_dereference(br->mdb, br); 280 mp = br_mdb_ip_get(mdb, &data->ip); 281 if (!mp) 282 goto out; 283 for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL; 284 pp = &p->next) { 285 if (p->port != port) 286 continue; 287 p->flags |= MDB_PG_FLAGS_OFFLOAD; 288 } 289 out: 290 spin_unlock_bh(&br->multicast_lock); 291 err: 292 kfree(priv); 293 } 294 295 static void br_mdb_switchdev_host_port(struct net_device *dev, 296 struct net_device *lower_dev, 297 struct br_mdb_entry *entry, int type) 298 { 299 struct switchdev_obj_port_mdb mdb = { 300 .obj = { 301 .id = SWITCHDEV_OBJ_ID_HOST_MDB, 302 .flags = SWITCHDEV_F_DEFER, 303 }, 304 .vid = entry->vid, 305 }; 306 307 if (entry->addr.proto == htons(ETH_P_IP)) 308 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr); 309 #if IS_ENABLED(CONFIG_IPV6) 310 else 311 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr); 312 #endif 313 314 mdb.obj.orig_dev = dev; 315 switch (type) { 316 case RTM_NEWMDB: 317 switchdev_port_obj_add(lower_dev, &mdb.obj); 318 break; 319 case RTM_DELMDB: 320 switchdev_port_obj_del(lower_dev, &mdb.obj); 321 break; 322 } 323 } 324 325 static void br_mdb_switchdev_host(struct net_device *dev, 326 struct br_mdb_entry *entry, int type) 327 { 328 struct net_device *lower_dev; 329 struct list_head *iter; 330 331 netdev_for_each_lower_dev(dev, lower_dev, iter) 332 br_mdb_switchdev_host_port(dev, lower_dev, entry, type); 333 } 334 335 static void __br_mdb_notify(struct net_device *dev, struct net_bridge_port *p, 336 struct br_mdb_entry *entry, int type) 337 { 338 struct br_mdb_complete_info *complete_info; 339 struct switchdev_obj_port_mdb mdb = { 340 .obj = { 341 .id = SWITCHDEV_OBJ_ID_PORT_MDB, 342 .flags = SWITCHDEV_F_DEFER, 343 }, 344 .vid = entry->vid, 345 }; 346 struct net_device *port_dev; 347 struct net *net = dev_net(dev); 348 struct sk_buff *skb; 349 int err = -ENOBUFS; 350 351 port_dev = __dev_get_by_index(net, entry->ifindex); 352 if (entry->addr.proto == htons(ETH_P_IP)) 353 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr); 354 #if IS_ENABLED(CONFIG_IPV6) 355 else 356 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr); 357 #endif 358 359 mdb.obj.orig_dev = port_dev; 360 if (p && port_dev && type == RTM_NEWMDB) { 361 complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC); 362 if (complete_info) { 363 complete_info->port = p; 364 __mdb_entry_to_br_ip(entry, &complete_info->ip); 365 mdb.obj.complete_priv = complete_info; 366 mdb.obj.complete = br_mdb_complete; 367 if (switchdev_port_obj_add(port_dev, &mdb.obj)) 368 kfree(complete_info); 369 } 370 } else if (p && port_dev && type == RTM_DELMDB) { 371 switchdev_port_obj_del(port_dev, &mdb.obj); 372 } 373 374 if (!p) 375 br_mdb_switchdev_host(dev, entry, type); 376 377 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC); 378 if (!skb) 379 goto errout; 380 381 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF); 382 if (err < 0) { 383 kfree_skb(skb); 384 goto errout; 385 } 386 387 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC); 388 return; 389 errout: 390 rtnl_set_sk_err(net, RTNLGRP_MDB, err); 391 } 392 393 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 394 struct br_ip *group, int type, u8 flags) 395 { 396 struct br_mdb_entry entry; 397 398 memset(&entry, 0, sizeof(entry)); 399 if (port) 400 entry.ifindex = port->dev->ifindex; 401 else 402 entry.ifindex = dev->ifindex; 403 entry.addr.proto = group->proto; 404 entry.addr.u.ip4 = group->u.ip4; 405 #if IS_ENABLED(CONFIG_IPV6) 406 entry.addr.u.ip6 = group->u.ip6; 407 #endif 408 entry.vid = group->vid; 409 __mdb_entry_fill_flags(&entry, flags); 410 __br_mdb_notify(dev, port, &entry, type); 411 } 412 413 static int nlmsg_populate_rtr_fill(struct sk_buff *skb, 414 struct net_device *dev, 415 int ifindex, u32 pid, 416 u32 seq, int type, unsigned int flags) 417 { 418 struct br_port_msg *bpm; 419 struct nlmsghdr *nlh; 420 struct nlattr *nest; 421 422 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI); 423 if (!nlh) 424 return -EMSGSIZE; 425 426 bpm = nlmsg_data(nlh); 427 memset(bpm, 0, sizeof(*bpm)); 428 bpm->family = AF_BRIDGE; 429 bpm->ifindex = dev->ifindex; 430 nest = nla_nest_start(skb, MDBA_ROUTER); 431 if (!nest) 432 goto cancel; 433 434 if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex)) 435 goto end; 436 437 nla_nest_end(skb, nest); 438 nlmsg_end(skb, nlh); 439 return 0; 440 441 end: 442 nla_nest_end(skb, nest); 443 cancel: 444 nlmsg_cancel(skb, nlh); 445 return -EMSGSIZE; 446 } 447 448 static inline size_t rtnl_rtr_nlmsg_size(void) 449 { 450 return NLMSG_ALIGN(sizeof(struct br_port_msg)) 451 + nla_total_size(sizeof(__u32)); 452 } 453 454 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 455 int type) 456 { 457 struct net *net = dev_net(dev); 458 struct sk_buff *skb; 459 int err = -ENOBUFS; 460 int ifindex; 461 462 ifindex = port ? port->dev->ifindex : 0; 463 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC); 464 if (!skb) 465 goto errout; 466 467 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF); 468 if (err < 0) { 469 kfree_skb(skb); 470 goto errout; 471 } 472 473 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC); 474 return; 475 476 errout: 477 rtnl_set_sk_err(net, RTNLGRP_MDB, err); 478 } 479 480 static bool is_valid_mdb_entry(struct br_mdb_entry *entry) 481 { 482 if (entry->ifindex == 0) 483 return false; 484 485 if (entry->addr.proto == htons(ETH_P_IP)) { 486 if (!ipv4_is_multicast(entry->addr.u.ip4)) 487 return false; 488 if (ipv4_is_local_multicast(entry->addr.u.ip4)) 489 return false; 490 #if IS_ENABLED(CONFIG_IPV6) 491 } else if (entry->addr.proto == htons(ETH_P_IPV6)) { 492 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6)) 493 return false; 494 #endif 495 } else 496 return false; 497 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY) 498 return false; 499 if (entry->vid >= VLAN_VID_MASK) 500 return false; 501 502 return true; 503 } 504 505 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh, 506 struct net_device **pdev, struct br_mdb_entry **pentry) 507 { 508 struct net *net = sock_net(skb->sk); 509 struct br_mdb_entry *entry; 510 struct br_port_msg *bpm; 511 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1]; 512 struct net_device *dev; 513 int err; 514 515 err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL, 516 NULL); 517 if (err < 0) 518 return err; 519 520 bpm = nlmsg_data(nlh); 521 if (bpm->ifindex == 0) { 522 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n"); 523 return -EINVAL; 524 } 525 526 dev = __dev_get_by_index(net, bpm->ifindex); 527 if (dev == NULL) { 528 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n"); 529 return -ENODEV; 530 } 531 532 if (!(dev->priv_flags & IFF_EBRIDGE)) { 533 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n"); 534 return -EOPNOTSUPP; 535 } 536 537 *pdev = dev; 538 539 if (!tb[MDBA_SET_ENTRY] || 540 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) { 541 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n"); 542 return -EINVAL; 543 } 544 545 entry = nla_data(tb[MDBA_SET_ENTRY]); 546 if (!is_valid_mdb_entry(entry)) { 547 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n"); 548 return -EINVAL; 549 } 550 551 *pentry = entry; 552 return 0; 553 } 554 555 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port, 556 struct br_ip *group, unsigned char state) 557 { 558 struct net_bridge_mdb_entry *mp; 559 struct net_bridge_port_group *p; 560 struct net_bridge_port_group __rcu **pp; 561 struct net_bridge_mdb_htable *mdb; 562 unsigned long now = jiffies; 563 int err; 564 565 mdb = mlock_dereference(br->mdb, br); 566 mp = br_mdb_ip_get(mdb, group); 567 if (!mp) { 568 mp = br_multicast_new_group(br, port, group); 569 err = PTR_ERR_OR_ZERO(mp); 570 if (err) 571 return err; 572 } 573 574 for (pp = &mp->ports; 575 (p = mlock_dereference(*pp, br)) != NULL; 576 pp = &p->next) { 577 if (p->port == port) 578 return -EEXIST; 579 if ((unsigned long)p->port < (unsigned long)port) 580 break; 581 } 582 583 p = br_multicast_new_port_group(port, group, *pp, state, NULL); 584 if (unlikely(!p)) 585 return -ENOMEM; 586 rcu_assign_pointer(*pp, p); 587 if (state == MDB_TEMPORARY) 588 mod_timer(&p->timer, now + br->multicast_membership_interval); 589 590 return 0; 591 } 592 593 static int __br_mdb_add(struct net *net, struct net_bridge *br, 594 struct br_mdb_entry *entry) 595 { 596 struct br_ip ip; 597 struct net_device *dev; 598 struct net_bridge_port *p; 599 int ret; 600 601 if (!netif_running(br->dev) || br->multicast_disabled) 602 return -EINVAL; 603 604 dev = __dev_get_by_index(net, entry->ifindex); 605 if (!dev) 606 return -ENODEV; 607 608 p = br_port_get_rtnl(dev); 609 if (!p || p->br != br || p->state == BR_STATE_DISABLED) 610 return -EINVAL; 611 612 __mdb_entry_to_br_ip(entry, &ip); 613 614 spin_lock_bh(&br->multicast_lock); 615 ret = br_mdb_add_group(br, p, &ip, entry->state); 616 spin_unlock_bh(&br->multicast_lock); 617 return ret; 618 } 619 620 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, 621 struct netlink_ext_ack *extack) 622 { 623 struct net *net = sock_net(skb->sk); 624 struct net_bridge_vlan_group *vg; 625 struct net_device *dev, *pdev; 626 struct br_mdb_entry *entry; 627 struct net_bridge_port *p; 628 struct net_bridge_vlan *v; 629 struct net_bridge *br; 630 int err; 631 632 err = br_mdb_parse(skb, nlh, &dev, &entry); 633 if (err < 0) 634 return err; 635 636 br = netdev_priv(dev); 637 638 /* If vlan filtering is enabled and VLAN is not specified 639 * install mdb entry on all vlans configured on the port. 640 */ 641 pdev = __dev_get_by_index(net, entry->ifindex); 642 if (!pdev) 643 return -ENODEV; 644 645 p = br_port_get_rtnl(pdev); 646 if (!p || p->br != br || p->state == BR_STATE_DISABLED) 647 return -EINVAL; 648 649 vg = nbp_vlan_group(p); 650 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) { 651 list_for_each_entry(v, &vg->vlan_list, vlist) { 652 entry->vid = v->vid; 653 err = __br_mdb_add(net, br, entry); 654 if (err) 655 break; 656 __br_mdb_notify(dev, p, entry, RTM_NEWMDB); 657 } 658 } else { 659 err = __br_mdb_add(net, br, entry); 660 if (!err) 661 __br_mdb_notify(dev, p, entry, RTM_NEWMDB); 662 } 663 664 return err; 665 } 666 667 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry) 668 { 669 struct net_bridge_mdb_htable *mdb; 670 struct net_bridge_mdb_entry *mp; 671 struct net_bridge_port_group *p; 672 struct net_bridge_port_group __rcu **pp; 673 struct br_ip ip; 674 int err = -EINVAL; 675 676 if (!netif_running(br->dev) || br->multicast_disabled) 677 return -EINVAL; 678 679 __mdb_entry_to_br_ip(entry, &ip); 680 681 spin_lock_bh(&br->multicast_lock); 682 mdb = mlock_dereference(br->mdb, br); 683 684 mp = br_mdb_ip_get(mdb, &ip); 685 if (!mp) 686 goto unlock; 687 688 for (pp = &mp->ports; 689 (p = mlock_dereference(*pp, br)) != NULL; 690 pp = &p->next) { 691 if (!p->port || p->port->dev->ifindex != entry->ifindex) 692 continue; 693 694 if (p->port->state == BR_STATE_DISABLED) 695 goto unlock; 696 697 __mdb_entry_fill_flags(entry, p->flags); 698 rcu_assign_pointer(*pp, p->next); 699 hlist_del_init(&p->mglist); 700 del_timer(&p->timer); 701 call_rcu_bh(&p->rcu, br_multicast_free_pg); 702 err = 0; 703 704 if (!mp->ports && !mp->host_joined && 705 netif_running(br->dev)) 706 mod_timer(&mp->timer, jiffies); 707 break; 708 } 709 710 unlock: 711 spin_unlock_bh(&br->multicast_lock); 712 return err; 713 } 714 715 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, 716 struct netlink_ext_ack *extack) 717 { 718 struct net *net = sock_net(skb->sk); 719 struct net_bridge_vlan_group *vg; 720 struct net_device *dev, *pdev; 721 struct br_mdb_entry *entry; 722 struct net_bridge_port *p; 723 struct net_bridge_vlan *v; 724 struct net_bridge *br; 725 int err; 726 727 err = br_mdb_parse(skb, nlh, &dev, &entry); 728 if (err < 0) 729 return err; 730 731 br = netdev_priv(dev); 732 733 /* If vlan filtering is enabled and VLAN is not specified 734 * delete mdb entry on all vlans configured on the port. 735 */ 736 pdev = __dev_get_by_index(net, entry->ifindex); 737 if (!pdev) 738 return -ENODEV; 739 740 p = br_port_get_rtnl(pdev); 741 if (!p || p->br != br || p->state == BR_STATE_DISABLED) 742 return -EINVAL; 743 744 vg = nbp_vlan_group(p); 745 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) { 746 list_for_each_entry(v, &vg->vlan_list, vlist) { 747 entry->vid = v->vid; 748 err = __br_mdb_del(br, entry); 749 if (!err) 750 __br_mdb_notify(dev, p, entry, RTM_DELMDB); 751 } 752 } else { 753 err = __br_mdb_del(br, entry); 754 if (!err) 755 __br_mdb_notify(dev, p, entry, RTM_DELMDB); 756 } 757 758 return err; 759 } 760 761 void br_mdb_init(void) 762 { 763 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0); 764 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0); 765 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0); 766 } 767 768 void br_mdb_uninit(void) 769 { 770 rtnl_unregister(PF_BRIDGE, RTM_GETMDB); 771 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB); 772 rtnl_unregister(PF_BRIDGE, RTM_DELMDB); 773 } 774