net/bridge/br_mdb.c

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