net/bridge/br_fdb.c

   1 /*
   2  *      Forwarding database
   3  *      Linux ethernet bridge
   4  *
   5  *      Authors:
   6  *      Lennert Buytenhek               <buytenh@gnu.org>
   7  *
   8  *      This program is free software; you can redistribute it and/or
   9  *      modify it under the terms of the GNU General Public License
  10  *      as published by the Free Software Foundation; either version
  11  *      2 of the License, or (at your option) any later version.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/rculist.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/times.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/jhash.h>
  22 #include <linux/random.h>
  23 #include <linux/slab.h>
  24 #include <linux/atomic.h>
  25 #include <asm/unaligned.h>
  26 #include <linux/if_vlan.h>
  27 #include "br_private.h"
  28
  29 static struct kmem_cache *br_fdb_cache __read_mostly;
  30 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
  31                       const unsigned char *addr, u16 vid);
  32 static void fdb_notify(struct net_bridge *br,
  33                        const struct net_bridge_fdb_entry *, int);
  34
  35 static u32 fdb_salt __read_mostly;
  36
  37 int __init br_fdb_init(void)
  38 {
  39         br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
  40                                          sizeof(struct net_bridge_fdb_entry),
  41                                          0,
  42                                          SLAB_HWCACHE_ALIGN, NULL);
  43         if (!br_fdb_cache)
  44                 return -ENOMEM;
  45
  46         get_random_bytes(&fdb_salt, sizeof(fdb_salt));
  47         return 0;
  48 }
  49
  50 void br_fdb_fini(void)
  51 {
  52         kmem_cache_destroy(br_fdb_cache);
  53 }
  54
  55
  56 /* if topology_changing then use forward_delay (default 15 sec)
  57  * otherwise keep longer (default 5 minutes)
  58  */
  59 static inline unsigned long hold_time(const struct net_bridge *br)
  60 {
  61         return br->topology_change ? br->forward_delay : br->ageing_time;
  62 }
  63
  64 static inline int has_expired(const struct net_bridge *br,
  65                                   const struct net_bridge_fdb_entry *fdb)
  66 {
  67         return !fdb->is_static &&
  68                 time_before_eq(fdb->updated + hold_time(br), jiffies);
  69 }
  70
  71 static inline int br_mac_hash(const unsigned char *mac, __u16 vid)
  72 {
  73         /* use 1 byte of OUI and 3 bytes of NIC */
  74         u32 key = get_unaligned((u32 *)(mac + 2));
  75         return jhash_2words(key, vid, fdb_salt) & (BR_HASH_SIZE - 1);
  76 }
  77
  78 static void fdb_rcu_free(struct rcu_head *head)
  79 {
  80         struct net_bridge_fdb_entry *ent
  81                 = container_of(head, struct net_bridge_fdb_entry, rcu);
  82         kmem_cache_free(br_fdb_cache, ent);
  83 }
  84
  85 static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
  86 {
  87         hlist_del_rcu(&f->hlist);
  88         fdb_notify(br, f, RTM_DELNEIGH);
  89         call_rcu(&f->rcu, fdb_rcu_free);
  90 }
  91
  92 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
  93 {
  94         struct net_bridge *br = p->br;
  95         bool no_vlan = (nbp_get_vlan_info(p) == NULL) ? true : false;
  96         int i;
  97
  98         spin_lock_bh(&br->hash_lock);
  99
 100         /* Search all chains since old address/hash is unknown */
 101         for (i = 0; i < BR_HASH_SIZE; i++) {
 102                 struct hlist_node *h;
 103                 hlist_for_each(h, &br->hash[i]) {
 104                         struct net_bridge_fdb_entry *f;
 105
 106                         f = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
 107                         if (f->dst == p && f->is_local) {
 108                                 /* maybe another port has same hw addr? */
 109                                 struct net_bridge_port *op;
 110                                 u16 vid = f->vlan_id;
 111                                 list_for_each_entry(op, &br->port_list, list) {
 112                                         if (op != p &&
 113                                             ether_addr_equal(op->dev->dev_addr,
 114                                                              f->addr.addr) &&
 115                                             nbp_vlan_find(op, vid)) {
 116                                                 f->dst = op;
 117                                                 goto insert;
 118                                         }
 119                                 }
 120
 121                                 /* delete old one */
 122                                 fdb_delete(br, f);
 123 insert:
 124                                 /* insert new address,  may fail if invalid
 125                                  * address or dup.
 126                                  */
 127                                 fdb_insert(br, p, newaddr, vid);
 128
 129                                 /* if this port has no vlan information
 130                                  * configured, we can safely be done at
 131                                  * this point.
 132                                  */
 133                                 if (no_vlan)
 134                                         goto done;
 135                         }
 136                 }
 137         }
 138
 139 done:
 140         spin_unlock_bh(&br->hash_lock);
 141 }
 142
 143 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
 144 {
 145         struct net_bridge_fdb_entry *f;
 146         struct net_port_vlans *pv;
 147         u16 vid = 0;
 148
 149         /* If old entry was unassociated with any port, then delete it. */
 150         f = __br_fdb_get(br, br->dev->dev_addr, 0);
 151         if (f && f->is_local && !f->dst)
 152                 fdb_delete(br, f);
 153
 154         fdb_insert(br, NULL, newaddr, 0);
 155
 156         /* Now remove and add entries for every VLAN configured on the
 157          * bridge.  This function runs under RTNL so the bitmap will not
 158          * change from under us.
 159          */
 160         pv = br_get_vlan_info(br);
 161         if (!pv)
 162                 return;
 163
 164         for_each_set_bit_from(vid, pv->vlan_bitmap, VLAN_N_VID) {
 165                 f = __br_fdb_get(br, br->dev->dev_addr, vid);
 166                 if (f && f->is_local && !f->dst)
 167                         fdb_delete(br, f);
 168                 fdb_insert(br, NULL, newaddr, vid);
 169         }
 170 }
 171
 172 void br_fdb_cleanup(unsigned long _data)
 173 {
 174         struct net_bridge *br = (struct net_bridge *)_data;
 175         unsigned long delay = hold_time(br);
 176         unsigned long next_timer = jiffies + br->ageing_time;
 177         int i;
 178
 179         spin_lock(&br->hash_lock);
 180         for (i = 0; i < BR_HASH_SIZE; i++) {
 181                 struct net_bridge_fdb_entry *f;
 182                 struct hlist_node *n;
 183
 184                 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
 185                         unsigned long this_timer;
 186                         if (f->is_static)
 187                                 continue;
 188                         this_timer = f->updated + delay;
 189                         if (time_before_eq(this_timer, jiffies))
 190                                 fdb_delete(br, f);
 191                         else if (time_before(this_timer, next_timer))
 192                                 next_timer = this_timer;
 193                 }
 194         }
 195         spin_unlock(&br->hash_lock);
 196
 197         mod_timer(&br->gc_timer, round_jiffies_up(next_timer));
 198 }
 199
 200 /* Completely flush all dynamic entries in forwarding database.*/
 201 void br_fdb_flush(struct net_bridge *br)
 202 {
 203         int i;
 204
 205         spin_lock_bh(&br->hash_lock);
 206         for (i = 0; i < BR_HASH_SIZE; i++) {
 207                 struct net_bridge_fdb_entry *f;
 208                 struct hlist_node *n;
 209                 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
 210                         if (!f->is_static)
 211                                 fdb_delete(br, f);
 212                 }
 213         }
 214         spin_unlock_bh(&br->hash_lock);
 215 }
 216
 217 /* Flush all entries referring to a specific port.
 218  * if do_all is set also flush static entries
 219  */
 220 void br_fdb_delete_by_port(struct net_bridge *br,
 221                            const struct net_bridge_port *p,
 222                            int do_all)
 223 {
 224         int i;
 225
 226         spin_lock_bh(&br->hash_lock);
 227         for (i = 0; i < BR_HASH_SIZE; i++) {
 228                 struct hlist_node *h, *g;
 229
 230                 hlist_for_each_safe(h, g, &br->hash[i]) {
 231                         struct net_bridge_fdb_entry *f
 232                                 = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
 233                         if (f->dst != p)
 234                                 continue;
 235
 236                         if (f->is_static && !do_all)
 237                                 continue;
 238                         /*
 239                          * if multiple ports all have the same device address
 240                          * then when one port is deleted, assign
 241                          * the local entry to other port
 242                          */
 243                         if (f->is_local) {
 244                                 struct net_bridge_port *op;
 245                                 list_for_each_entry(op, &br->port_list, list) {
 246                                         if (op != p &&
 247                                             ether_addr_equal(op->dev->dev_addr,
 248                                                              f->addr.addr)) {
 249                                                 f->dst = op;
 250                                                 goto skip_delete;
 251                                         }
 252                                 }
 253                         }
 254
 255                         fdb_delete(br, f);
 256                 skip_delete: ;
 257                 }
 258         }
 259         spin_unlock_bh(&br->hash_lock);
 260 }
 261
 262 /* No locking or refcounting, assumes caller has rcu_read_lock */
 263 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 264                                           const unsigned char *addr,
 265                                           __u16 vid)
 266 {
 267         struct net_bridge_fdb_entry *fdb;
 268
 269         hlist_for_each_entry_rcu(fdb,
 270                                 &br->hash[br_mac_hash(addr, vid)], hlist) {
 271                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 272                     fdb->vlan_id == vid) {
 273                         if (unlikely(has_expired(br, fdb)))
 274                                 break;
 275                         return fdb;
 276                 }
 277         }
 278
 279         return NULL;
 280 }
 281
 282 #if IS_ENABLED(CONFIG_ATM_LANE)
 283 /* Interface used by ATM LANE hook to test
 284  * if an addr is on some other bridge port */
 285 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
 286 {
 287         struct net_bridge_fdb_entry *fdb;
 288         struct net_bridge_port *port;
 289         int ret;
 290
 291         rcu_read_lock();
 292         port = br_port_get_rcu(dev);
 293         if (!port)
 294                 ret = 0;
 295         else {
 296                 fdb = __br_fdb_get(port->br, addr, 0);
 297                 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
 298                         fdb->dst->state == BR_STATE_FORWARDING;
 299         }
 300         rcu_read_unlock();
 301
 302         return ret;
 303 }
 304 #endif /* CONFIG_ATM_LANE */
 305
 306 /*
 307  * Fill buffer with forwarding table records in
 308  * the API format.
 309  */
 310 int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 311                    unsigned long maxnum, unsigned long skip)
 312 {
 313         struct __fdb_entry *fe = buf;
 314         int i, num = 0;
 315         struct net_bridge_fdb_entry *f;
 316
 317         memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
 318
 319         rcu_read_lock();
 320         for (i = 0; i < BR_HASH_SIZE; i++) {
 321                 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
 322                         if (num >= maxnum)
 323                                 goto out;
 324
 325                         if (has_expired(br, f))
 326                                 continue;
 327
 328                         /* ignore pseudo entry for local MAC address */
 329                         if (!f->dst)
 330                                 continue;
 331
 332                         if (skip) {
 333                                 --skip;
 334                                 continue;
 335                         }
 336
 337                         /* convert from internal format to API */
 338                         memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
 339
 340                         /* due to ABI compat need to split into hi/lo */
 341                         fe->port_no = f->dst->port_no;
 342                         fe->port_hi = f->dst->port_no >> 8;
 343
 344                         fe->is_local = f->is_local;
 345                         if (!f->is_static)
 346                                 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
 347                         ++fe;
 348                         ++num;
 349                 }
 350         }
 351
 352  out:
 353         rcu_read_unlock();
 354
 355         return num;
 356 }
 357
 358 static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
 359                                              const unsigned char *addr,
 360                                              __u16 vid)
 361 {
 362         struct net_bridge_fdb_entry *fdb;
 363
 364         hlist_for_each_entry(fdb, head, hlist) {
 365                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 366                     fdb->vlan_id == vid)
 367                         return fdb;
 368         }
 369         return NULL;
 370 }
 371
 372 static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
 373                                                  const unsigned char *addr,
 374                                                  __u16 vid)
 375 {
 376         struct net_bridge_fdb_entry *fdb;
 377
 378         hlist_for_each_entry_rcu(fdb, head, hlist) {
 379                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 380                     fdb->vlan_id == vid)
 381                         return fdb;
 382         }
 383         return NULL;
 384 }
 385
 386 static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
 387                                                struct net_bridge_port *source,
 388                                                const unsigned char *addr,
 389                                                __u16 vid)
 390 {
 391         struct net_bridge_fdb_entry *fdb;
 392
 393         fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
 394         if (fdb) {
 395                 memcpy(fdb->addr.addr, addr, ETH_ALEN);
 396                 fdb->dst = source;
 397                 fdb->vlan_id = vid;
 398                 fdb->is_local = 0;
 399                 fdb->is_static = 0;
 400                 fdb->updated = fdb->used = jiffies;
 401                 hlist_add_head_rcu(&fdb->hlist, head);
 402         }
 403         return fdb;
 404 }
 405
 406 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 407                   const unsigned char *addr, u16 vid)
 408 {
 409         struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
 410         struct net_bridge_fdb_entry *fdb;
 411
 412         if (!is_valid_ether_addr(addr))
 413                 return -EINVAL;
 414
 415         fdb = fdb_find(head, addr, vid);
 416         if (fdb) {
 417                 /* it is okay to have multiple ports with same
 418                  * address, just use the first one.
 419                  */
 420                 if (fdb->is_local)
 421                         return 0;
 422                 br_warn(br, "adding interface %s with same address "
 423                        "as a received packet\n",
 424                        source ? source->dev->name : br->dev->name);
 425                 fdb_delete(br, fdb);
 426         }
 427
 428         fdb = fdb_create(head, source, addr, vid);
 429         if (!fdb)
 430                 return -ENOMEM;
 431
 432         fdb->is_local = fdb->is_static = 1;
 433         fdb_notify(br, fdb, RTM_NEWNEIGH);
 434         return 0;
 435 }
 436
 437 /* Add entry for local address of interface */
 438 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 439                   const unsigned char *addr, u16 vid)
 440 {
 441         int ret;
 442
 443         spin_lock_bh(&br->hash_lock);
 444         ret = fdb_insert(br, source, addr, vid);
 445         spin_unlock_bh(&br->hash_lock);
 446         return ret;
 447 }
 448
 449 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 450                    const unsigned char *addr, u16 vid)
 451 {
 452         struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
 453         struct net_bridge_fdb_entry *fdb;
 454
 455         /* some users want to always flood. */
 456         if (hold_time(br) == 0)
 457                 return;
 458
 459         /* ignore packets unless we are using this port */
 460         if (!(source->state == BR_STATE_LEARNING ||
 461               source->state == BR_STATE_FORWARDING))
 462                 return;
 463
 464         fdb = fdb_find_rcu(head, addr, vid);
 465         if (likely(fdb)) {
 466                 /* attempt to update an entry for a local interface */
 467                 if (unlikely(fdb->is_local)) {
 468                         if (net_ratelimit())
 469                                 br_warn(br, "received packet on %s with "
 470                                         "own address as source address\n",
 471                                         source->dev->name);
 472                 } else {
 473                         /* fastpath: update of existing entry */
 474                         fdb->dst = source;
 475                         fdb->updated = jiffies;
 476                 }
 477         } else {
 478                 spin_lock(&br->hash_lock);
 479                 if (likely(!fdb_find(head, addr, vid))) {
 480                         fdb = fdb_create(head, source, addr, vid);
 481                         if (fdb)
 482                                 fdb_notify(br, fdb, RTM_NEWNEIGH);
 483                 }
 484                 /* else  we lose race and someone else inserts
 485                  * it first, don't bother updating
 486                  */
 487                 spin_unlock(&br->hash_lock);
 488         }
 489 }
 490
 491 static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb)
 492 {
 493         if (fdb->is_local)
 494                 return NUD_PERMANENT;
 495         else if (fdb->is_static)
 496                 return NUD_NOARP;
 497         else if (has_expired(fdb->dst->br, fdb))
 498                 return NUD_STALE;
 499         else
 500                 return NUD_REACHABLE;
 501 }
 502
 503 static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
 504                          const struct net_bridge_fdb_entry *fdb,
 505                          u32 portid, u32 seq, int type, unsigned int flags)
 506 {
 507         unsigned long now = jiffies;
 508         struct nda_cacheinfo ci;
 509         struct nlmsghdr *nlh;
 510         struct ndmsg *ndm;
 511
 512         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 513         if (nlh == NULL)
 514                 return -EMSGSIZE;
 515
 516         ndm = nlmsg_data(nlh);
 517         ndm->ndm_family  = AF_BRIDGE;
 518         ndm->ndm_pad1    = 0;
 519         ndm->ndm_pad2    = 0;
 520         ndm->ndm_flags   = 0;
 521         ndm->ndm_type    = 0;
 522         ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
 523         ndm->ndm_state   = fdb_to_nud(fdb);
 524
 525         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr))
 526                 goto nla_put_failure;
 527         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 528         ci.ndm_confirmed = 0;
 529         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 530         ci.ndm_refcnt    = 0;
 531         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 532                 goto nla_put_failure;
 533
 534         if (nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id))
 535                 goto nla_put_failure;
 536
 537         return nlmsg_end(skb, nlh);
 538
 539 nla_put_failure:
 540         nlmsg_cancel(skb, nlh);
 541         return -EMSGSIZE;
 542 }
 543
 544 static inline size_t fdb_nlmsg_size(void)
 545 {
 546         return NLMSG_ALIGN(sizeof(struct ndmsg))
 547                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 548                 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
 549                 + nla_total_size(sizeof(struct nda_cacheinfo));
 550 }
 551
 552 static void fdb_notify(struct net_bridge *br,
 553                        const struct net_bridge_fdb_entry *fdb, int type)
 554 {
 555         struct net *net = dev_net(br->dev);
 556         struct sk_buff *skb;
 557         int err = -ENOBUFS;
 558
 559         skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
 560         if (skb == NULL)
 561                 goto errout;
 562
 563         err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
 564         if (err < 0) {
 565                 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
 566                 WARN_ON(err == -EMSGSIZE);
 567                 kfree_skb(skb);
 568                 goto errout;
 569         }
 570         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 571         return;
 572 errout:
 573         if (err < 0)
 574                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 575 }
 576
 577 /* Dump information about entries, in response to GETNEIGH */
 578 int br_fdb_dump(struct sk_buff *skb,
 579                 struct netlink_callback *cb,
 580                 struct net_device *dev,
 581                 int idx)
 582 {
 583         struct net_bridge *br = netdev_priv(dev);
 584         int i;
 585
 586         if (!(dev->priv_flags & IFF_EBRIDGE))
 587                 goto out;
 588
 589         for (i = 0; i < BR_HASH_SIZE; i++) {
 590                 struct net_bridge_fdb_entry *f;
 591
 592                 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
 593                         if (idx < cb->args[0])
 594                                 goto skip;
 595
 596                         if (fdb_fill_info(skb, br, f,
 597                                           NETLINK_CB(cb->skb).portid,
 598                                           cb->nlh->nlmsg_seq,
 599                                           RTM_NEWNEIGH,
 600                                           NLM_F_MULTI) < 0)
 601                                 break;
 602 skip:
 603                         ++idx;
 604                 }
 605         }
 606
 607 out:
 608         return idx;
 609 }
 610
 611 /* Update (create or replace) forwarding database entry */
 612 static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
 613                          __u16 state, __u16 flags, __u16 vid)
 614 {
 615         struct net_bridge *br = source->br;
 616         struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
 617         struct net_bridge_fdb_entry *fdb;
 618         bool modified = false;
 619
 620         fdb = fdb_find(head, addr, vid);
 621         if (fdb == NULL) {
 622                 if (!(flags & NLM_F_CREATE))
 623                         return -ENOENT;
 624
 625                 fdb = fdb_create(head, source, addr, vid);
 626                 if (!fdb)
 627                         return -ENOMEM;
 628
 629                 modified = true;
 630         } else {
 631                 if (flags & NLM_F_EXCL)
 632                         return -EEXIST;
 633
 634                 if (fdb->dst != source) {
 635                         fdb->dst = source;
 636                         modified = true;
 637                 }
 638         }
 639
 640         if (fdb_to_nud(fdb) != state) {
 641                 if (state & NUD_PERMANENT)
 642                         fdb->is_local = fdb->is_static = 1;
 643                 else if (state & NUD_NOARP) {
 644                         fdb->is_local = 0;
 645                         fdb->is_static = 1;
 646                 } else
 647                         fdb->is_local = fdb->is_static = 0;
 648
 649                 modified = true;
 650         }
 651
 652         fdb->used = jiffies;
 653         if (modified) {
 654                 fdb->updated = jiffies;
 655                 fdb_notify(br, fdb, RTM_NEWNEIGH);
 656         }
 657
 658         return 0;
 659 }
 660
 661 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p,
 662                const unsigned char *addr, u16 nlh_flags, u16 vid)
 663 {
 664         int err = 0;
 665
 666         if (ndm->ndm_flags & NTF_USE) {
 667                 rcu_read_lock();
 668                 br_fdb_update(p->br, p, addr, vid);
 669                 rcu_read_unlock();
 670         } else {
 671                 spin_lock_bh(&p->br->hash_lock);
 672                 err = fdb_add_entry(p, addr, ndm->ndm_state,
 673                                     nlh_flags, vid);
 674                 spin_unlock_bh(&p->br->hash_lock);
 675         }
 676
 677         return err;
 678 }
 679
 680 /* Add new permanent fdb entry with RTM_NEWNEIGH */
 681 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 682                struct net_device *dev,
 683                const unsigned char *addr, u16 nlh_flags)
 684 {
 685         struct net_bridge_port *p;
 686         int err = 0;
 687         struct net_port_vlans *pv;
 688         unsigned short vid = VLAN_N_VID;
 689
 690         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
 691                 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
 692                 return -EINVAL;
 693         }
 694
 695         if (tb[NDA_VLAN]) {
 696                 if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) {
 697                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n");
 698                         return -EINVAL;
 699                 }
 700
 701                 vid = nla_get_u16(tb[NDA_VLAN]);
 702
 703                 if (vid >= VLAN_N_VID) {
 704                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n",
 705                                 vid);
 706                         return -EINVAL;
 707                 }
 708         }
 709
 710         p = br_port_get_rtnl(dev);
 711         if (p == NULL) {
 712                 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
 713                         dev->name);
 714                 return -EINVAL;
 715         }
 716
 717         pv = nbp_get_vlan_info(p);
 718         if (vid != VLAN_N_VID) {
 719                 if (!pv || !test_bit(vid, pv->vlan_bitmap)) {
 720                         pr_info("bridge: RTM_NEWNEIGH with unconfigured "
 721                                 "vlan %d on port %s\n", vid, dev->name);
 722                         return -EINVAL;
 723                 }
 724
 725                 /* VID was specified, so use it. */
 726                 err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
 727         } else {
 728                 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID)) {
 729                         err = __br_fdb_add(ndm, p, addr, nlh_flags, 0);
 730                         goto out;
 731                 }
 732
 733                 /* We have vlans configured on this port and user didn't
 734                  * specify a VLAN.  To be nice, add/update entry for every
 735                  * vlan on this port.
 736                  */
 737                 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
 738                         err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
 739                         if (err)
 740                                 goto out;
 741                 }
 742         }
 743
 744 out:
 745         return err;
 746 }
 747
 748 int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr,
 749                        u16 vlan)
 750 {
 751         struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)];
 752         struct net_bridge_fdb_entry *fdb;
 753
 754         fdb = fdb_find(head, addr, vlan);
 755         if (!fdb)
 756                 return -ENOENT;
 757
 758         fdb_delete(br, fdb);
 759         return 0;
 760 }
 761
 762 static int __br_fdb_delete(struct net_bridge_port *p,
 763                            const unsigned char *addr, u16 vid)
 764 {
 765         int err;
 766
 767         spin_lock_bh(&p->br->hash_lock);
 768         err = fdb_delete_by_addr(p->br, addr, vid);
 769         spin_unlock_bh(&p->br->hash_lock);
 770
 771         return err;
 772 }
 773
 774 /* Remove neighbor entry with RTM_DELNEIGH */
 775 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 776                   struct net_device *dev,
 777                   const unsigned char *addr)
 778 {
 779         struct net_bridge_port *p;
 780         int err;
 781         struct net_port_vlans *pv;
 782         unsigned short vid = VLAN_N_VID;
 783
 784         if (tb[NDA_VLAN]) {
 785                 if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) {
 786                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n");
 787                         return -EINVAL;
 788                 }
 789
 790                 vid = nla_get_u16(tb[NDA_VLAN]);
 791
 792                 if (vid >= VLAN_N_VID) {
 793                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n",
 794                                 vid);
 795                         return -EINVAL;
 796                 }
 797         }
 798         p = br_port_get_rtnl(dev);
 799         if (p == NULL) {
 800                 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
 801                         dev->name);
 802                 return -EINVAL;
 803         }
 804
 805         pv = nbp_get_vlan_info(p);
 806         if (vid != VLAN_N_VID) {
 807                 if (!pv || !test_bit(vid, pv->vlan_bitmap)) {
 808                         pr_info("bridge: RTM_DELNEIGH with unconfigured "
 809                                 "vlan %d on port %s\n", vid, dev->name);
 810                         return -EINVAL;
 811                 }
 812
 813                 err = __br_fdb_delete(p, addr, vid);
 814         } else {
 815                 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID)) {
 816                         err = __br_fdb_delete(p, addr, 0);
 817                         goto out;
 818                 }
 819
 820                 /* We have vlans configured on this port and user didn't
 821                  * specify a VLAN.  To be nice, add/update entry for every
 822                  * vlan on this port.
 823                  */
 824                 err = -ENOENT;
 825                 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
 826                         err &= __br_fdb_delete(p, addr, vid);
 827                 }
 828         }
 829 out:
 830         return err;
 831 }