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 nlattr *nest_ent;
  92                                 struct br_mdb_entry e;
  93
  94                                 port = p->port;
  95                                 if (!port)
  96                                         continue;
  97
  98                                 memset(&e, 0, sizeof(e));
  99                                 e.ifindex = port->dev->ifindex;
 100                                 e.vid = p->addr.vid;
 101                                 __mdb_entry_fill_flags(&e, p->flags);
 102                                 if (p->addr.proto == htons(ETH_P_IP))
 103                                         e.addr.u.ip4 = p->addr.u.ip4;
 104 #if IS_ENABLED(CONFIG_IPV6)
 105                                 if (p->addr.proto == htons(ETH_P_IPV6))
 106                                         e.addr.u.ip6 = p->addr.u.ip6;
 107 #endif
 108                                 e.addr.proto = p->addr.proto;
 109                                 nest_ent = nla_nest_start(skb,
 110                                                           MDBA_MDB_ENTRY_INFO);
 111                                 if (!nest_ent) {
 112                                         nla_nest_cancel(skb, nest2);
 113                                         err = -EMSGSIZE;
 114                                         goto out;
 115                                 }
 116                                 if (nla_put_nohdr(skb, sizeof(e), &e) ||
 117                                     nla_put_u32(skb,
 118                                                 MDBA_MDB_EATTR_TIMER,
 119                                                 br_timer_value(&p->timer))) {
 120                                         nla_nest_cancel(skb, nest_ent);
 121                                         nla_nest_cancel(skb, nest2);
 122                                         err = -EMSGSIZE;
 123                                         goto out;
 124                                 }
 125                                 nla_nest_end(skb, nest_ent);
 126                         }
 127                         nla_nest_end(skb, nest2);
 128                 skip:
 129                         idx++;
 130                 }
 131         }
 132
 133 out:
 134         cb->args[1] = idx;
 135         nla_nest_end(skb, nest);
 136         return err;
 137 }
 138
 139 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
 140 {
 141         struct net_device *dev;
 142         struct net *net = sock_net(skb->sk);
 143         struct nlmsghdr *nlh = NULL;
 144         int idx = 0, s_idx;
 145
 146         s_idx = cb->args[0];
 147
 148         rcu_read_lock();
 149
 150         /* In theory this could be wrapped to 0... */
 151         cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
 152
 153         for_each_netdev_rcu(net, dev) {
 154                 if (dev->priv_flags & IFF_EBRIDGE) {
 155                         struct br_port_msg *bpm;
 156
 157                         if (idx < s_idx)
 158                                 goto skip;
 159
 160                         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
 161                                         cb->nlh->nlmsg_seq, RTM_GETMDB,
 162                                         sizeof(*bpm), NLM_F_MULTI);
 163                         if (nlh == NULL)
 164                                 break;
 165
 166                         bpm = nlmsg_data(nlh);
 167                         memset(bpm, 0, sizeof(*bpm));
 168                         bpm->ifindex = dev->ifindex;
 169                         if (br_mdb_fill_info(skb, cb, dev) < 0)
 170                                 goto out;
 171                         if (br_rports_fill_info(skb, cb, dev) < 0)
 172                                 goto out;
 173
 174                         cb->args[1] = 0;
 175                         nlmsg_end(skb, nlh);
 176                 skip:
 177                         idx++;
 178                 }
 179         }
 180
 181 out:
 182         if (nlh)
 183                 nlmsg_end(skb, nlh);
 184         rcu_read_unlock();
 185         cb->args[0] = idx;
 186         return skb->len;
 187 }
 188
 189 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
 190                                    struct net_device *dev,
 191                                    struct br_mdb_entry *entry, u32 pid,
 192                                    u32 seq, int type, unsigned int flags)
 193 {
 194         struct nlmsghdr *nlh;
 195         struct br_port_msg *bpm;
 196         struct nlattr *nest, *nest2;
 197
 198         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
 199         if (!nlh)
 200                 return -EMSGSIZE;
 201
 202         bpm = nlmsg_data(nlh);
 203         memset(bpm, 0, sizeof(*bpm));
 204         bpm->family  = AF_BRIDGE;
 205         bpm->ifindex = dev->ifindex;
 206         nest = nla_nest_start(skb, MDBA_MDB);
 207         if (nest == NULL)
 208                 goto cancel;
 209         nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
 210         if (nest2 == NULL)
 211                 goto end;
 212
 213         if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
 214                 goto end;
 215
 216         nla_nest_end(skb, nest2);
 217         nla_nest_end(skb, nest);
 218         nlmsg_end(skb, nlh);
 219         return 0;
 220
 221 end:
 222         nla_nest_end(skb, nest);
 223 cancel:
 224         nlmsg_cancel(skb, nlh);
 225         return -EMSGSIZE;
 226 }
 227
 228 static inline size_t rtnl_mdb_nlmsg_size(void)
 229 {
 230         return NLMSG_ALIGN(sizeof(struct br_port_msg))
 231                 + nla_total_size(sizeof(struct br_mdb_entry));
 232 }
 233
 234 static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry,
 235                             int type, struct net_bridge_port_group *pg)
 236 {
 237         struct switchdev_obj_port_mdb mdb = {
 238                 .obj = {
 239                         .id = SWITCHDEV_OBJ_ID_PORT_MDB,
 240                         .flags = SWITCHDEV_F_DEFER,
 241                 },
 242                 .vid = entry->vid,
 243         };
 244         struct net_device *port_dev;
 245         struct net *net = dev_net(dev);
 246         struct sk_buff *skb;
 247         int err = -ENOBUFS;
 248
 249         port_dev = __dev_get_by_index(net, entry->ifindex);
 250         if (entry->addr.proto == htons(ETH_P_IP))
 251                 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
 252 #if IS_ENABLED(CONFIG_IPV6)
 253         else
 254                 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
 255 #endif
 256
 257         mdb.obj.orig_dev = port_dev;
 258         if (port_dev && type == RTM_NEWMDB) {
 259                 err = switchdev_port_obj_add(port_dev, &mdb.obj);
 260                 if (!err && pg)
 261                         pg->flags |= MDB_PG_FLAGS_OFFLOAD;
 262         } else if (port_dev && type == RTM_DELMDB) {
 263                 switchdev_port_obj_del(port_dev, &mdb.obj);
 264         }
 265
 266         skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
 267         if (!skb)
 268                 goto errout;
 269
 270         err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
 271         if (err < 0) {
 272                 kfree_skb(skb);
 273                 goto errout;
 274         }
 275
 276         rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
 277         return;
 278 errout:
 279         rtnl_set_sk_err(net, RTNLGRP_MDB, err);
 280 }
 281
 282 void br_mdb_notify(struct net_device *dev, struct net_bridge_port_group *pg,
 283                    int type)
 284 {
 285         struct br_mdb_entry entry;
 286
 287         memset(&entry, 0, sizeof(entry));
 288         entry.ifindex = pg->port->dev->ifindex;
 289         entry.addr.proto = pg->addr.proto;
 290         entry.addr.u.ip4 = pg->addr.u.ip4;
 291 #if IS_ENABLED(CONFIG_IPV6)
 292         entry.addr.u.ip6 = pg->addr.u.ip6;
 293 #endif
 294         entry.vid = pg->addr.vid;
 295         __mdb_entry_fill_flags(&entry, pg->flags);
 296         __br_mdb_notify(dev, &entry, type, pg);
 297 }
 298
 299 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
 300                                    struct net_device *dev,
 301                                    int ifindex, u32 pid,
 302                                    u32 seq, int type, unsigned int flags)
 303 {
 304         struct br_port_msg *bpm;
 305         struct nlmsghdr *nlh;
 306         struct nlattr *nest;
 307
 308         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
 309         if (!nlh)
 310                 return -EMSGSIZE;
 311
 312         bpm = nlmsg_data(nlh);
 313         memset(bpm, 0, sizeof(*bpm));
 314         bpm->family = AF_BRIDGE;
 315         bpm->ifindex = dev->ifindex;
 316         nest = nla_nest_start(skb, MDBA_ROUTER);
 317         if (!nest)
 318                 goto cancel;
 319
 320         if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
 321                 goto end;
 322
 323         nla_nest_end(skb, nest);
 324         nlmsg_end(skb, nlh);
 325         return 0;
 326
 327 end:
 328         nla_nest_end(skb, nest);
 329 cancel:
 330         nlmsg_cancel(skb, nlh);
 331         return -EMSGSIZE;
 332 }
 333
 334 static inline size_t rtnl_rtr_nlmsg_size(void)
 335 {
 336         return NLMSG_ALIGN(sizeof(struct br_port_msg))
 337                 + nla_total_size(sizeof(__u32));
 338 }
 339
 340 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 341                    int type)
 342 {
 343         struct net *net = dev_net(dev);
 344         struct sk_buff *skb;
 345         int err = -ENOBUFS;
 346         int ifindex;
 347
 348         ifindex = port ? port->dev->ifindex : 0;
 349         skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
 350         if (!skb)
 351                 goto errout;
 352
 353         err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
 354         if (err < 0) {
 355                 kfree_skb(skb);
 356                 goto errout;
 357         }
 358
 359         rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
 360         return;
 361
 362 errout:
 363         rtnl_set_sk_err(net, RTNLGRP_MDB, err);
 364 }
 365
 366 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
 367 {
 368         if (entry->ifindex == 0)
 369                 return false;
 370
 371         if (entry->addr.proto == htons(ETH_P_IP)) {
 372                 if (!ipv4_is_multicast(entry->addr.u.ip4))
 373                         return false;
 374                 if (ipv4_is_local_multicast(entry->addr.u.ip4))
 375                         return false;
 376 #if IS_ENABLED(CONFIG_IPV6)
 377         } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
 378                 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
 379                         return false;
 380 #endif
 381         } else
 382                 return false;
 383         if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
 384                 return false;
 385         if (entry->vid >= VLAN_VID_MASK)
 386                 return false;
 387
 388         return true;
 389 }
 390
 391 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
 392                         struct net_device **pdev, struct br_mdb_entry **pentry)
 393 {
 394         struct net *net = sock_net(skb->sk);
 395         struct br_mdb_entry *entry;
 396         struct br_port_msg *bpm;
 397         struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
 398         struct net_device *dev;
 399         int err;
 400
 401         err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL);
 402         if (err < 0)
 403                 return err;
 404
 405         bpm = nlmsg_data(nlh);
 406         if (bpm->ifindex == 0) {
 407                 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
 408                 return -EINVAL;
 409         }
 410
 411         dev = __dev_get_by_index(net, bpm->ifindex);
 412         if (dev == NULL) {
 413                 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
 414                 return -ENODEV;
 415         }
 416
 417         if (!(dev->priv_flags & IFF_EBRIDGE)) {
 418                 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
 419                 return -EOPNOTSUPP;
 420         }
 421
 422         *pdev = dev;
 423
 424         if (!tb[MDBA_SET_ENTRY] ||
 425             nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
 426                 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
 427                 return -EINVAL;
 428         }
 429
 430         entry = nla_data(tb[MDBA_SET_ENTRY]);
 431         if (!is_valid_mdb_entry(entry)) {
 432                 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
 433                 return -EINVAL;
 434         }
 435
 436         *pentry = entry;
 437         return 0;
 438 }
 439
 440 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
 441                             struct br_ip *group, unsigned char state,
 442                             struct net_bridge_port_group **pg)
 443 {
 444         struct net_bridge_mdb_entry *mp;
 445         struct net_bridge_port_group *p;
 446         struct net_bridge_port_group __rcu **pp;
 447         struct net_bridge_mdb_htable *mdb;
 448         unsigned long now = jiffies;
 449         int err;
 450
 451         mdb = mlock_dereference(br->mdb, br);
 452         mp = br_mdb_ip_get(mdb, group);
 453         if (!mp) {
 454                 mp = br_multicast_new_group(br, port, group);
 455                 err = PTR_ERR_OR_ZERO(mp);
 456                 if (err)
 457                         return err;
 458         }
 459
 460         for (pp = &mp->ports;
 461              (p = mlock_dereference(*pp, br)) != NULL;
 462              pp = &p->next) {
 463                 if (p->port == port)
 464                         return -EEXIST;
 465                 if ((unsigned long)p->port < (unsigned long)port)
 466                         break;
 467         }
 468
 469         p = br_multicast_new_port_group(port, group, *pp, state);
 470         if (unlikely(!p))
 471                 return -ENOMEM;
 472         rcu_assign_pointer(*pp, p);
 473         *pg = p;
 474         if (state == MDB_TEMPORARY)
 475                 mod_timer(&p->timer, now + br->multicast_membership_interval);
 476
 477         return 0;
 478 }
 479
 480 static int __br_mdb_add(struct net *net, struct net_bridge *br,
 481                         struct br_mdb_entry *entry,
 482                         struct net_bridge_port_group **pg)
 483 {
 484         struct br_ip ip;
 485         struct net_device *dev;
 486         struct net_bridge_port *p;
 487         int ret;
 488
 489         if (!netif_running(br->dev) || br->multicast_disabled)
 490                 return -EINVAL;
 491
 492         dev = __dev_get_by_index(net, entry->ifindex);
 493         if (!dev)
 494                 return -ENODEV;
 495
 496         p = br_port_get_rtnl(dev);
 497         if (!p || p->br != br || p->state == BR_STATE_DISABLED)
 498                 return -EINVAL;
 499
 500         memset(&ip, 0, sizeof(ip));
 501         ip.vid = entry->vid;
 502         ip.proto = entry->addr.proto;
 503         if (ip.proto == htons(ETH_P_IP))
 504                 ip.u.ip4 = entry->addr.u.ip4;
 505 #if IS_ENABLED(CONFIG_IPV6)
 506         else
 507                 ip.u.ip6 = entry->addr.u.ip6;
 508 #endif
 509
 510         spin_lock_bh(&br->multicast_lock);
 511         ret = br_mdb_add_group(br, p, &ip, entry->state, pg);
 512         spin_unlock_bh(&br->multicast_lock);
 513         return ret;
 514 }
 515
 516 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
 517 {
 518         struct net *net = sock_net(skb->sk);
 519         struct net_bridge_port_group *pg;
 520         struct net_bridge_vlan_group *vg;
 521         struct net_device *dev, *pdev;
 522         struct br_mdb_entry *entry;
 523         struct net_bridge_port *p;
 524         struct net_bridge_vlan *v;
 525         struct net_bridge *br;
 526         int err;
 527
 528         err = br_mdb_parse(skb, nlh, &dev, &entry);
 529         if (err < 0)
 530                 return err;
 531
 532         br = netdev_priv(dev);
 533
 534         /* If vlan filtering is enabled and VLAN is not specified
 535          * install mdb entry on all vlans configured on the port.
 536          */
 537         pdev = __dev_get_by_index(net, entry->ifindex);
 538         if (!pdev)
 539                 return -ENODEV;
 540
 541         p = br_port_get_rtnl(pdev);
 542         if (!p || p->br != br || p->state == BR_STATE_DISABLED)
 543                 return -EINVAL;
 544
 545         vg = nbp_vlan_group(p);
 546         if (br_vlan_enabled(br) && vg && entry->vid == 0) {
 547                 list_for_each_entry(v, &vg->vlan_list, vlist) {
 548                         entry->vid = v->vid;
 549                         err = __br_mdb_add(net, br, entry, &pg);
 550                         if (err)
 551                                 break;
 552                         __br_mdb_notify(dev, entry, RTM_NEWMDB, pg);
 553                 }
 554         } else {
 555                 err = __br_mdb_add(net, br, entry, &pg);
 556                 if (!err)
 557                         __br_mdb_notify(dev, entry, RTM_NEWMDB, pg);
 558         }
 559
 560         return err;
 561 }
 562
 563 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
 564 {
 565         struct net_bridge_mdb_htable *mdb;
 566         struct net_bridge_mdb_entry *mp;
 567         struct net_bridge_port_group *p;
 568         struct net_bridge_port_group __rcu **pp;
 569         struct br_ip ip;
 570         int err = -EINVAL;
 571
 572         if (!netif_running(br->dev) || br->multicast_disabled)
 573                 return -EINVAL;
 574
 575         memset(&ip, 0, sizeof(ip));
 576         ip.vid = entry->vid;
 577         ip.proto = entry->addr.proto;
 578         if (ip.proto == htons(ETH_P_IP))
 579                 ip.u.ip4 = entry->addr.u.ip4;
 580 #if IS_ENABLED(CONFIG_IPV6)
 581         else
 582                 ip.u.ip6 = entry->addr.u.ip6;
 583 #endif
 584
 585         spin_lock_bh(&br->multicast_lock);
 586         mdb = mlock_dereference(br->mdb, br);
 587
 588         mp = br_mdb_ip_get(mdb, &ip);
 589         if (!mp)
 590                 goto unlock;
 591
 592         for (pp = &mp->ports;
 593              (p = mlock_dereference(*pp, br)) != NULL;
 594              pp = &p->next) {
 595                 if (!p->port || p->port->dev->ifindex != entry->ifindex)
 596                         continue;
 597
 598                 if (p->port->state == BR_STATE_DISABLED)
 599                         goto unlock;
 600
 601                 __mdb_entry_fill_flags(entry, p->flags);
 602                 rcu_assign_pointer(*pp, p->next);
 603                 hlist_del_init(&p->mglist);
 604                 del_timer(&p->timer);
 605                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
 606                 err = 0;
 607
 608                 if (!mp->ports && !mp->mglist &&
 609                     netif_running(br->dev))
 610                         mod_timer(&mp->timer, jiffies);
 611                 break;
 612         }
 613
 614 unlock:
 615         spin_unlock_bh(&br->multicast_lock);
 616         return err;
 617 }
 618
 619 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
 620 {
 621         struct net *net = sock_net(skb->sk);
 622         struct net_bridge_vlan_group *vg;
 623         struct net_device *dev, *pdev;
 624         struct br_mdb_entry *entry;
 625         struct net_bridge_port *p;
 626         struct net_bridge_vlan *v;
 627         struct net_bridge *br;
 628         int err;
 629
 630         err = br_mdb_parse(skb, nlh, &dev, &entry);
 631         if (err < 0)
 632                 return err;
 633
 634         br = netdev_priv(dev);
 635
 636         /* If vlan filtering is enabled and VLAN is not specified
 637          * delete mdb entry on all vlans configured on the port.
 638          */
 639         pdev = __dev_get_by_index(net, entry->ifindex);
 640         if (!pdev)
 641                 return -ENODEV;
 642
 643         p = br_port_get_rtnl(pdev);
 644         if (!p || p->br != br || p->state == BR_STATE_DISABLED)
 645                 return -EINVAL;
 646
 647         vg = nbp_vlan_group(p);
 648         if (br_vlan_enabled(br) && vg && entry->vid == 0) {
 649                 list_for_each_entry(v, &vg->vlan_list, vlist) {
 650                         entry->vid = v->vid;
 651                         err = __br_mdb_del(br, entry);
 652                         if (!err)
 653                                 __br_mdb_notify(dev, entry, RTM_DELMDB, NULL);
 654                 }
 655         } else {
 656                 err = __br_mdb_del(br, entry);
 657                 if (!err)
 658                         __br_mdb_notify(dev, entry, RTM_DELMDB, NULL);
 659         }
 660
 661         return err;
 662 }
 663
 664 void br_mdb_init(void)
 665 {
 666         rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
 667         rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
 668         rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
 669 }
 670
 671 void br_mdb_uninit(void)
 672 {
 673         rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
 674         rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
 675         rtnl_unregister(PF_BRIDGE, RTM_DELMDB);
 676 }