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