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                                 struct br_mdb_entry e;
  92
  93                                 port = p->port;
  94                                 if (!port)
  95                                         continue;
  96                                 memset(&e, 0, sizeof(e));
  97                                 e.ifindex = port->dev->ifindex;
  98                                 e.vid = p->addr.vid;
  99                                 __mdb_entry_fill_flags(&e, p->flags);
 100                                 if (p->addr.proto == htons(ETH_P_IP))
 101                                         e.addr.u.ip4 = p->addr.u.ip4;
 102 #if IS_ENABLED(CONFIG_IPV6)
 103                                 if (p->addr.proto == htons(ETH_P_IPV6))
 104                                         e.addr.u.ip6 = p->addr.u.ip6;
 105 #endif
 106                                 e.addr.proto = p->addr.proto;
 107                                 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) {
 108                                         nla_nest_cancel(skb, nest2);
 109                                         err = -EMSGSIZE;
 110                                         goto out;
 111                                 }
 112                         }
 113                         nla_nest_end(skb, nest2);
 114                 skip:
 115                         idx++;
 116                 }
 117         }
 118
 119 out:
 120         cb->args[1] = idx;
 121         nla_nest_end(skb, nest);
 122         return err;
 123 }
 124
 125 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
 126 {
 127         struct net_device *dev;
 128         struct net *net = sock_net(skb->sk);
 129         struct nlmsghdr *nlh = NULL;
 130         int idx = 0, s_idx;
 131
 132         s_idx = cb->args[0];
 133
 134         rcu_read_lock();
 135
 136         /* In theory this could be wrapped to 0... */
 137         cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
 138
 139         for_each_netdev_rcu(net, dev) {
 140                 if (dev->priv_flags & IFF_EBRIDGE) {
 141                         struct br_port_msg *bpm;
 142
 143                         if (idx < s_idx)
 144                                 goto skip;
 145
 146                         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
 147                                         cb->nlh->nlmsg_seq, RTM_GETMDB,
 148                                         sizeof(*bpm), NLM_F_MULTI);
 149                         if (nlh == NULL)
 150                                 break;
 151
 152                         bpm = nlmsg_data(nlh);
 153                         memset(bpm, 0, sizeof(*bpm));
 154                         bpm->ifindex = dev->ifindex;
 155                         if (br_mdb_fill_info(skb, cb, dev) < 0)
 156                                 goto out;
 157                         if (br_rports_fill_info(skb, cb, dev) < 0)
 158                                 goto out;
 159
 160                         cb->args[1] = 0;
 161                         nlmsg_end(skb, nlh);
 162                 skip:
 163                         idx++;
 164                 }
 165         }
 166
 167 out:
 168         if (nlh)
 169                 nlmsg_end(skb, nlh);
 170         rcu_read_unlock();
 171         cb->args[0] = idx;
 172         return skb->len;
 173 }
 174
 175 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
 176                                    struct net_device *dev,
 177                                    struct br_mdb_entry *entry, u32 pid,
 178                                    u32 seq, int type, unsigned int flags)
 179 {
 180         struct nlmsghdr *nlh;
 181         struct br_port_msg *bpm;
 182         struct nlattr *nest, *nest2;
 183
 184         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
 185         if (!nlh)
 186                 return -EMSGSIZE;
 187
 188         bpm = nlmsg_data(nlh);
 189         memset(bpm, 0, sizeof(*bpm));
 190         bpm->family  = AF_BRIDGE;
 191         bpm->ifindex = dev->ifindex;
 192         nest = nla_nest_start(skb, MDBA_MDB);
 193         if (nest == NULL)
 194                 goto cancel;
 195         nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
 196         if (nest2 == NULL)
 197                 goto end;
 198
 199         if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
 200                 goto end;
 201
 202         nla_nest_end(skb, nest2);
 203         nla_nest_end(skb, nest);
 204         nlmsg_end(skb, nlh);
 205         return 0;
 206
 207 end:
 208         nla_nest_end(skb, nest);
 209 cancel:
 210         nlmsg_cancel(skb, nlh);
 211         return -EMSGSIZE;
 212 }
 213
 214 static inline size_t rtnl_mdb_nlmsg_size(void)
 215 {
 216         return NLMSG_ALIGN(sizeof(struct br_port_msg))
 217                 + nla_total_size(sizeof(struct br_mdb_entry));
 218 }
 219
 220 static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry,
 221                             int type, struct net_bridge_port_group *pg)
 222 {
 223         struct switchdev_obj_port_mdb mdb = {
 224                 .obj = {
 225                         .id = SWITCHDEV_OBJ_ID_PORT_MDB,
 226                         .flags = SWITCHDEV_F_DEFER,
 227                 },
 228                 .vid = entry->vid,
 229         };
 230         struct net_device *port_dev;
 231         struct net *net = dev_net(dev);
 232         struct sk_buff *skb;
 233         int err = -ENOBUFS;
 234
 235         port_dev = __dev_get_by_index(net, entry->ifindex);
 236         if (entry->addr.proto == htons(ETH_P_IP))
 237                 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
 238 #if IS_ENABLED(CONFIG_IPV6)
 239         else
 240                 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
 241 #endif
 242
 243         mdb.obj.orig_dev = port_dev;
 244         if (port_dev && type == RTM_NEWMDB) {
 245                 err = switchdev_port_obj_add(port_dev, &mdb.obj);
 246                 if (!err && pg)
 247                         pg->flags |= MDB_PG_FLAGS_OFFLOAD;
 248         } else if (port_dev && type == RTM_DELMDB) {
 249                 switchdev_port_obj_del(port_dev, &mdb.obj);
 250         }
 251
 252         skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
 253         if (!skb)
 254                 goto errout;
 255
 256         err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
 257         if (err < 0) {
 258                 kfree_skb(skb);
 259                 goto errout;
 260         }
 261
 262         rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
 263         return;
 264 errout:
 265         rtnl_set_sk_err(net, RTNLGRP_MDB, err);
 266 }
 267
 268 void br_mdb_notify(struct net_device *dev, struct net_bridge_port_group *pg,
 269                    int type)
 270 {
 271         struct br_mdb_entry entry;
 272
 273         memset(&entry, 0, sizeof(entry));
 274         entry.ifindex = pg->port->dev->ifindex;
 275         entry.addr.proto = pg->addr.proto;
 276         entry.addr.u.ip4 = pg->addr.u.ip4;
 277 #if IS_ENABLED(CONFIG_IPV6)
 278         entry.addr.u.ip6 = pg->addr.u.ip6;
 279 #endif
 280         entry.vid = pg->addr.vid;
 281         __mdb_entry_fill_flags(&entry, pg->flags);
 282         __br_mdb_notify(dev, &entry, type, pg);
 283 }
 284
 285 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
 286                                    struct net_device *dev,
 287                                    int ifindex, u32 pid,
 288                                    u32 seq, int type, unsigned int flags)
 289 {
 290         struct br_port_msg *bpm;
 291         struct nlmsghdr *nlh;
 292         struct nlattr *nest;
 293
 294         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
 295         if (!nlh)
 296                 return -EMSGSIZE;
 297
 298         bpm = nlmsg_data(nlh);
 299         memset(bpm, 0, sizeof(*bpm));
 300         bpm->family = AF_BRIDGE;
 301         bpm->ifindex = dev->ifindex;
 302         nest = nla_nest_start(skb, MDBA_ROUTER);
 303         if (!nest)
 304                 goto cancel;
 305
 306         if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
 307                 goto end;
 308
 309         nla_nest_end(skb, nest);
 310         nlmsg_end(skb, nlh);
 311         return 0;
 312
 313 end:
 314         nla_nest_end(skb, nest);
 315 cancel:
 316         nlmsg_cancel(skb, nlh);
 317         return -EMSGSIZE;
 318 }
 319
 320 static inline size_t rtnl_rtr_nlmsg_size(void)
 321 {
 322         return NLMSG_ALIGN(sizeof(struct br_port_msg))
 323                 + nla_total_size(sizeof(__u32));
 324 }
 325
 326 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 327                    int type)
 328 {
 329         struct net *net = dev_net(dev);
 330         struct sk_buff *skb;
 331         int err = -ENOBUFS;
 332         int ifindex;
 333
 334         ifindex = port ? port->dev->ifindex : 0;
 335         skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
 336         if (!skb)
 337                 goto errout;
 338
 339         err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
 340         if (err < 0) {
 341                 kfree_skb(skb);
 342                 goto errout;
 343         }
 344
 345         rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
 346         return;
 347
 348 errout:
 349         rtnl_set_sk_err(net, RTNLGRP_MDB, err);
 350 }
 351
 352 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
 353 {
 354         if (entry->ifindex == 0)
 355                 return false;
 356
 357         if (entry->addr.proto == htons(ETH_P_IP)) {
 358                 if (!ipv4_is_multicast(entry->addr.u.ip4))
 359                         return false;
 360                 if (ipv4_is_local_multicast(entry->addr.u.ip4))
 361                         return false;
 362 #if IS_ENABLED(CONFIG_IPV6)
 363         } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
 364                 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
 365                         return false;
 366 #endif
 367         } else
 368                 return false;
 369         if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
 370                 return false;
 371         if (entry->vid >= VLAN_VID_MASK)
 372                 return false;
 373
 374         return true;
 375 }
 376
 377 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
 378                         struct net_device **pdev, struct br_mdb_entry **pentry)
 379 {
 380         struct net *net = sock_net(skb->sk);
 381         struct br_mdb_entry *entry;
 382         struct br_port_msg *bpm;
 383         struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
 384         struct net_device *dev;
 385         int err;
 386
 387         err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL);
 388         if (err < 0)
 389                 return err;
 390
 391         bpm = nlmsg_data(nlh);
 392         if (bpm->ifindex == 0) {
 393                 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
 394                 return -EINVAL;
 395         }
 396
 397         dev = __dev_get_by_index(net, bpm->ifindex);
 398         if (dev == NULL) {
 399                 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
 400                 return -ENODEV;
 401         }
 402
 403         if (!(dev->priv_flags & IFF_EBRIDGE)) {
 404                 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
 405                 return -EOPNOTSUPP;
 406         }
 407
 408         *pdev = dev;
 409
 410         if (!tb[MDBA_SET_ENTRY] ||
 411             nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
 412                 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
 413                 return -EINVAL;
 414         }
 415
 416         entry = nla_data(tb[MDBA_SET_ENTRY]);
 417         if (!is_valid_mdb_entry(entry)) {
 418                 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
 419                 return -EINVAL;
 420         }
 421
 422         *pentry = entry;
 423         return 0;
 424 }
 425
 426 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
 427                             struct br_ip *group, unsigned char state,
 428                             struct net_bridge_port_group **pg)
 429 {
 430         struct net_bridge_mdb_entry *mp;
 431         struct net_bridge_port_group *p;
 432         struct net_bridge_port_group __rcu **pp;
 433         struct net_bridge_mdb_htable *mdb;
 434         unsigned long now = jiffies;
 435         int err;
 436
 437         mdb = mlock_dereference(br->mdb, br);
 438         mp = br_mdb_ip_get(mdb, group);
 439         if (!mp) {
 440                 mp = br_multicast_new_group(br, port, group);
 441                 err = PTR_ERR(mp);
 442                 if (IS_ERR(mp))
 443                         return err;
 444         }
 445
 446         for (pp = &mp->ports;
 447              (p = mlock_dereference(*pp, br)) != NULL;
 448              pp = &p->next) {
 449                 if (p->port == port)
 450                         return -EEXIST;
 451                 if ((unsigned long)p->port < (unsigned long)port)
 452                         break;
 453         }
 454
 455         p = br_multicast_new_port_group(port, group, *pp, state);
 456         if (unlikely(!p))
 457                 return -ENOMEM;
 458         rcu_assign_pointer(*pp, p);
 459         *pg = p;
 460         if (state == MDB_TEMPORARY)
 461                 mod_timer(&p->timer, now + br->multicast_membership_interval);
 462
 463         return 0;
 464 }
 465
 466 static int __br_mdb_add(struct net *net, struct net_bridge *br,
 467                         struct br_mdb_entry *entry,
 468                         struct net_bridge_port_group **pg)
 469 {
 470         struct br_ip ip;
 471         struct net_device *dev;
 472         struct net_bridge_port *p;
 473         int ret;
 474
 475         if (!netif_running(br->dev) || br->multicast_disabled)
 476                 return -EINVAL;
 477
 478         dev = __dev_get_by_index(net, entry->ifindex);
 479         if (!dev)
 480                 return -ENODEV;
 481
 482         p = br_port_get_rtnl(dev);
 483         if (!p || p->br != br || p->state == BR_STATE_DISABLED)
 484                 return -EINVAL;
 485
 486         memset(&ip, 0, sizeof(ip));
 487         ip.vid = entry->vid;
 488         ip.proto = entry->addr.proto;
 489         if (ip.proto == htons(ETH_P_IP))
 490                 ip.u.ip4 = entry->addr.u.ip4;
 491 #if IS_ENABLED(CONFIG_IPV6)
 492         else
 493                 ip.u.ip6 = entry->addr.u.ip6;
 494 #endif
 495
 496         spin_lock_bh(&br->multicast_lock);
 497         ret = br_mdb_add_group(br, p, &ip, entry->state, pg);
 498         spin_unlock_bh(&br->multicast_lock);
 499         return ret;
 500 }
 501
 502 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
 503 {
 504         struct net *net = sock_net(skb->sk);
 505         struct net_bridge_port_group *pg;
 506         struct net_bridge_vlan_group *vg;
 507         struct net_device *dev, *pdev;
 508         struct br_mdb_entry *entry;
 509         struct net_bridge_port *p;
 510         struct net_bridge_vlan *v;
 511         struct net_bridge *br;
 512         int err;
 513
 514         err = br_mdb_parse(skb, nlh, &dev, &entry);
 515         if (err < 0)
 516                 return err;
 517
 518         br = netdev_priv(dev);
 519
 520         /* If vlan filtering is enabled and VLAN is not specified
 521          * install mdb entry on all vlans configured on the port.
 522          */
 523         pdev = __dev_get_by_index(net, entry->ifindex);
 524         if (!pdev)
 525                 return -ENODEV;
 526
 527         p = br_port_get_rtnl(pdev);
 528         if (!p || p->br != br || p->state == BR_STATE_DISABLED)
 529                 return -EINVAL;
 530
 531         vg = nbp_vlan_group(p);
 532         if (br_vlan_enabled(br) && vg && entry->vid == 0) {
 533                 list_for_each_entry(v, &vg->vlan_list, vlist) {
 534                         entry->vid = v->vid;
 535                         err = __br_mdb_add(net, br, entry, &pg);
 536                         if (err)
 537                                 break;
 538                         __br_mdb_notify(dev, entry, RTM_NEWMDB, pg);
 539                 }
 540         } else {
 541                 err = __br_mdb_add(net, br, entry, &pg);
 542                 if (!err)
 543                         __br_mdb_notify(dev, entry, RTM_NEWMDB, pg);
 544         }
 545
 546         return err;
 547 }
 548
 549 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
 550 {
 551         struct net_bridge_mdb_htable *mdb;
 552         struct net_bridge_mdb_entry *mp;
 553         struct net_bridge_port_group *p;
 554         struct net_bridge_port_group __rcu **pp;
 555         struct br_ip ip;
 556         int err = -EINVAL;
 557
 558         if (!netif_running(br->dev) || br->multicast_disabled)
 559                 return -EINVAL;
 560
 561         memset(&ip, 0, sizeof(ip));
 562         ip.vid = entry->vid;
 563         ip.proto = entry->addr.proto;
 564         if (ip.proto == htons(ETH_P_IP))
 565                 ip.u.ip4 = entry->addr.u.ip4;
 566 #if IS_ENABLED(CONFIG_IPV6)
 567         else
 568                 ip.u.ip6 = entry->addr.u.ip6;
 569 #endif
 570
 571         spin_lock_bh(&br->multicast_lock);
 572         mdb = mlock_dereference(br->mdb, br);
 573
 574         mp = br_mdb_ip_get(mdb, &ip);
 575         if (!mp)
 576                 goto unlock;
 577
 578         for (pp = &mp->ports;
 579              (p = mlock_dereference(*pp, br)) != NULL;
 580              pp = &p->next) {
 581                 if (!p->port || p->port->dev->ifindex != entry->ifindex)
 582                         continue;
 583
 584                 if (p->port->state == BR_STATE_DISABLED)
 585                         goto unlock;
 586
 587                 __mdb_entry_fill_flags(entry, p->flags);
 588                 rcu_assign_pointer(*pp, p->next);
 589                 hlist_del_init(&p->mglist);
 590                 del_timer(&p->timer);
 591                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
 592                 err = 0;
 593
 594                 if (!mp->ports && !mp->mglist &&
 595                     netif_running(br->dev))
 596                         mod_timer(&mp->timer, jiffies);
 597                 break;
 598         }
 599
 600 unlock:
 601         spin_unlock_bh(&br->multicast_lock);
 602         return err;
 603 }
 604
 605 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
 606 {
 607         struct net *net = sock_net(skb->sk);
 608         struct net_bridge_vlan_group *vg;
 609         struct net_device *dev, *pdev;
 610         struct br_mdb_entry *entry;
 611         struct net_bridge_port *p;
 612         struct net_bridge_vlan *v;
 613         struct net_bridge *br;
 614         int err;
 615
 616         err = br_mdb_parse(skb, nlh, &dev, &entry);
 617         if (err < 0)
 618                 return err;
 619
 620         br = netdev_priv(dev);
 621
 622         /* If vlan filtering is enabled and VLAN is not specified
 623          * delete mdb entry on all vlans configured on the port.
 624          */
 625         pdev = __dev_get_by_index(net, entry->ifindex);
 626         if (!pdev)
 627                 return -ENODEV;
 628
 629         p = br_port_get_rtnl(pdev);
 630         if (!p || p->br != br || p->state == BR_STATE_DISABLED)
 631                 return -EINVAL;
 632
 633         vg = nbp_vlan_group(p);
 634         if (br_vlan_enabled(br) && vg && entry->vid == 0) {
 635                 list_for_each_entry(v, &vg->vlan_list, vlist) {
 636                         entry->vid = v->vid;
 637                         err = __br_mdb_del(br, entry);
 638                         if (!err)
 639                                 __br_mdb_notify(dev, entry, RTM_DELMDB, NULL);
 640                 }
 641         } else {
 642                 err = __br_mdb_del(br, entry);
 643                 if (!err)
 644                         __br_mdb_notify(dev, entry, RTM_DELMDB, NULL);
 645         }
 646
 647         return err;
 648 }
 649
 650 void br_mdb_init(void)
 651 {
 652         rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
 653         rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
 654         rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
 655 }
 656
 657 void br_mdb_uninit(void)
 658 {
 659         rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
 660         rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
 661         rtnl_unregister(PF_BRIDGE, RTM_DELMDB);
 662 }