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 (vid = find_next_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN, vid);
 165              vid < BR_VLAN_BITMAP_LEN;
 166              vid = find_next_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN, vid+1)) {
 167                 f = __br_fdb_get(br, br->dev->dev_addr, vid);
 168                 if (f && f->is_local && !f->dst)
 169                         fdb_delete(br, f);
 170                 fdb_insert(br, NULL, newaddr, vid);
 171         }
 172 }
 173
 174 void br_fdb_cleanup(unsigned long _data)
 175 {
 176         struct net_bridge *br = (struct net_bridge *)_data;
 177         unsigned long delay = hold_time(br);
 178         unsigned long next_timer = jiffies + br->ageing_time;
 179         int i;
 180
 181         spin_lock(&br->hash_lock);
 182         for (i = 0; i < BR_HASH_SIZE; i++) {
 183                 struct net_bridge_fdb_entry *f;
 184                 struct hlist_node *n;
 185
 186                 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
 187                         unsigned long this_timer;
 188                         if (f->is_static)
 189                                 continue;
 190                         this_timer = f->updated + delay;
 191                         if (time_before_eq(this_timer, jiffies))
 192                                 fdb_delete(br, f);
 193                         else if (time_before(this_timer, next_timer))
 194                                 next_timer = this_timer;
 195                 }
 196         }
 197         spin_unlock(&br->hash_lock);
 198
 199         mod_timer(&br->gc_timer, round_jiffies_up(next_timer));
 200 }
 201
 202 /* Completely flush all dynamic entries in forwarding database.*/
 203 void br_fdb_flush(struct net_bridge *br)
 204 {
 205         int i;
 206
 207         spin_lock_bh(&br->hash_lock);
 208         for (i = 0; i < BR_HASH_SIZE; i++) {
 209                 struct net_bridge_fdb_entry *f;
 210                 struct hlist_node *n;
 211                 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
 212                         if (!f->is_static)
 213                                 fdb_delete(br, f);
 214                 }
 215         }
 216         spin_unlock_bh(&br->hash_lock);
 217 }
 218
 219 /* Flush all entries referring to a specific port.
 220  * if do_all is set also flush static entries
 221  */
 222 void br_fdb_delete_by_port(struct net_bridge *br,
 223                            const struct net_bridge_port *p,
 224                            int do_all)
 225 {
 226         int i;
 227
 228         spin_lock_bh(&br->hash_lock);
 229         for (i = 0; i < BR_HASH_SIZE; i++) {
 230                 struct hlist_node *h, *g;
 231
 232                 hlist_for_each_safe(h, g, &br->hash[i]) {
 233                         struct net_bridge_fdb_entry *f
 234                                 = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
 235                         if (f->dst != p)
 236                                 continue;
 237
 238                         if (f->is_static && !do_all)
 239                                 continue;
 240                         /*
 241                          * if multiple ports all have the same device address
 242                          * then when one port is deleted, assign
 243                          * the local entry to other port
 244                          */
 245                         if (f->is_local) {
 246                                 struct net_bridge_port *op;
 247                                 list_for_each_entry(op, &br->port_list, list) {
 248                                         if (op != p &&
 249                                             ether_addr_equal(op->dev->dev_addr,
 250                                                              f->addr.addr)) {
 251                                                 f->dst = op;
 252                                                 goto skip_delete;
 253                                         }
 254                                 }
 255                         }
 256
 257                         fdb_delete(br, f);
 258                 skip_delete: ;
 259                 }
 260         }
 261         spin_unlock_bh(&br->hash_lock);
 262 }
 263
 264 /* No locking or refcounting, assumes caller has rcu_read_lock */
 265 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 266                                           const unsigned char *addr,
 267                                           __u16 vid)
 268 {
 269         struct net_bridge_fdb_entry *fdb;
 270
 271         hlist_for_each_entry_rcu(fdb,
 272                                 &br->hash[br_mac_hash(addr, vid)], hlist) {
 273                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 274                     fdb->vlan_id == vid) {
 275                         if (unlikely(has_expired(br, fdb)))
 276                                 break;
 277                         return fdb;
 278                 }
 279         }
 280
 281         return NULL;
 282 }
 283
 284 #if IS_ENABLED(CONFIG_ATM_LANE)
 285 /* Interface used by ATM LANE hook to test
 286  * if an addr is on some other bridge port */
 287 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
 288 {
 289         struct net_bridge_fdb_entry *fdb;
 290         struct net_bridge_port *port;
 291         int ret;
 292
 293         rcu_read_lock();
 294         port = br_port_get_rcu(dev);
 295         if (!port)
 296                 ret = 0;
 297         else {
 298                 fdb = __br_fdb_get(port->br, addr, 0);
 299                 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
 300                         fdb->dst->state == BR_STATE_FORWARDING;
 301         }
 302         rcu_read_unlock();
 303
 304         return ret;
 305 }
 306 #endif /* CONFIG_ATM_LANE */
 307
 308 /*
 309  * Fill buffer with forwarding table records in
 310  * the API format.
 311  */
 312 int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 313                    unsigned long maxnum, unsigned long skip)
 314 {
 315         struct __fdb_entry *fe = buf;
 316         int i, num = 0;
 317         struct net_bridge_fdb_entry *f;
 318
 319         memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
 320
 321         rcu_read_lock();
 322         for (i = 0; i < BR_HASH_SIZE; i++) {
 323                 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
 324                         if (num >= maxnum)
 325                                 goto out;
 326
 327                         if (has_expired(br, f))
 328                                 continue;
 329
 330                         /* ignore pseudo entry for local MAC address */
 331                         if (!f->dst)
 332                                 continue;
 333
 334                         if (skip) {
 335                                 --skip;
 336                                 continue;
 337                         }
 338
 339                         /* convert from internal format to API */
 340                         memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
 341
 342                         /* due to ABI compat need to split into hi/lo */
 343                         fe->port_no = f->dst->port_no;
 344                         fe->port_hi = f->dst->port_no >> 8;
 345
 346                         fe->is_local = f->is_local;
 347                         if (!f->is_static)
 348                                 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
 349                         ++fe;
 350                         ++num;
 351                 }
 352         }
 353
 354  out:
 355         rcu_read_unlock();
 356
 357         return num;
 358 }
 359
 360 static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
 361                                              const unsigned char *addr,
 362                                              __u16 vid)
 363 {
 364         struct net_bridge_fdb_entry *fdb;
 365
 366         hlist_for_each_entry(fdb, head, hlist) {
 367                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 368                     fdb->vlan_id == vid)
 369                         return fdb;
 370         }
 371         return NULL;
 372 }
 373
 374 static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
 375                                                  const unsigned char *addr,
 376                                                  __u16 vid)
 377 {
 378         struct net_bridge_fdb_entry *fdb;
 379
 380         hlist_for_each_entry_rcu(fdb, head, hlist) {
 381                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 382                     fdb->vlan_id == vid)
 383                         return fdb;
 384         }
 385         return NULL;
 386 }
 387
 388 static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
 389                                                struct net_bridge_port *source,
 390                                                const unsigned char *addr,
 391                                                __u16 vid)
 392 {
 393         struct net_bridge_fdb_entry *fdb;
 394
 395         fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
 396         if (fdb) {
 397                 memcpy(fdb->addr.addr, addr, ETH_ALEN);
 398                 fdb->dst = source;
 399                 fdb->vlan_id = vid;
 400                 fdb->is_local = 0;
 401                 fdb->is_static = 0;
 402                 fdb->updated = fdb->used = jiffies;
 403                 hlist_add_head_rcu(&fdb->hlist, head);
 404         }
 405         return fdb;
 406 }
 407
 408 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 409                   const unsigned char *addr, u16 vid)
 410 {
 411         struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
 412         struct net_bridge_fdb_entry *fdb;
 413
 414         if (!is_valid_ether_addr(addr))
 415                 return -EINVAL;
 416
 417         fdb = fdb_find(head, addr, vid);
 418         if (fdb) {
 419                 /* it is okay to have multiple ports with same
 420                  * address, just use the first one.
 421                  */
 422                 if (fdb->is_local)
 423                         return 0;
 424                 br_warn(br, "adding interface %s with same address "
 425                        "as a received packet\n",
 426                        source->dev->name);
 427                 fdb_delete(br, fdb);
 428         }
 429
 430         fdb = fdb_create(head, source, addr, vid);
 431         if (!fdb)
 432                 return -ENOMEM;
 433
 434         fdb->is_local = fdb->is_static = 1;
 435         fdb_notify(br, fdb, RTM_NEWNEIGH);
 436         return 0;
 437 }
 438
 439 /* Add entry for local address of interface */
 440 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 441                   const unsigned char *addr, u16 vid)
 442 {
 443         int ret;
 444
 445         spin_lock_bh(&br->hash_lock);
 446         ret = fdb_insert(br, source, addr, vid);
 447         spin_unlock_bh(&br->hash_lock);
 448         return ret;
 449 }
 450
 451 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 452                    const unsigned char *addr, u16 vid)
 453 {
 454         struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
 455         struct net_bridge_fdb_entry *fdb;
 456
 457         /* some users want to always flood. */
 458         if (hold_time(br) == 0)
 459                 return;
 460
 461         /* ignore packets unless we are using this port */
 462         if (!(source->state == BR_STATE_LEARNING ||
 463               source->state == BR_STATE_FORWARDING))
 464                 return;
 465
 466         fdb = fdb_find_rcu(head, addr, vid);
 467         if (likely(fdb)) {
 468                 /* attempt to update an entry for a local interface */
 469                 if (unlikely(fdb->is_local)) {
 470                         if (net_ratelimit())
 471                                 br_warn(br, "received packet on %s with "
 472                                         "own address as source address\n",
 473                                         source->dev->name);
 474                 } else {
 475                         /* fastpath: update of existing entry */
 476                         fdb->dst = source;
 477                         fdb->updated = jiffies;
 478                 }
 479         } else {
 480                 spin_lock(&br->hash_lock);
 481                 if (likely(!fdb_find(head, addr, vid))) {
 482                         fdb = fdb_create(head, source, addr, vid);
 483                         if (fdb)
 484                                 fdb_notify(br, fdb, RTM_NEWNEIGH);
 485                 }
 486                 /* else  we lose race and someone else inserts
 487                  * it first, don't bother updating
 488                  */
 489                 spin_unlock(&br->hash_lock);
 490         }
 491 }
 492
 493 static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb)
 494 {
 495         if (fdb->is_local)
 496                 return NUD_PERMANENT;
 497         else if (fdb->is_static)
 498                 return NUD_NOARP;
 499         else if (has_expired(fdb->dst->br, fdb))
 500                 return NUD_STALE;
 501         else
 502                 return NUD_REACHABLE;
 503 }
 504
 505 static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
 506                          const struct net_bridge_fdb_entry *fdb,
 507                          u32 portid, u32 seq, int type, unsigned int flags)
 508 {
 509         unsigned long now = jiffies;
 510         struct nda_cacheinfo ci;
 511         struct nlmsghdr *nlh;
 512         struct ndmsg *ndm;
 513
 514         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 515         if (nlh == NULL)
 516                 return -EMSGSIZE;
 517
 518         ndm = nlmsg_data(nlh);
 519         ndm->ndm_family  = AF_BRIDGE;
 520         ndm->ndm_pad1    = 0;
 521         ndm->ndm_pad2    = 0;
 522         ndm->ndm_flags   = 0;
 523         ndm->ndm_type    = 0;
 524         ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
 525         ndm->ndm_state   = fdb_to_nud(fdb);
 526
 527         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr))
 528                 goto nla_put_failure;
 529         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 530         ci.ndm_confirmed = 0;
 531         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 532         ci.ndm_refcnt    = 0;
 533         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 534                 goto nla_put_failure;
 535
 536         if (nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id))
 537                 goto nla_put_failure;
 538
 539         return nlmsg_end(skb, nlh);
 540
 541 nla_put_failure:
 542         nlmsg_cancel(skb, nlh);
 543         return -EMSGSIZE;
 544 }
 545
 546 static inline size_t fdb_nlmsg_size(void)
 547 {
 548         return NLMSG_ALIGN(sizeof(struct ndmsg))
 549                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 550                 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
 551                 + nla_total_size(sizeof(struct nda_cacheinfo));
 552 }
 553
 554 static void fdb_notify(struct net_bridge *br,
 555                        const struct net_bridge_fdb_entry *fdb, int type)
 556 {
 557         struct net *net = dev_net(br->dev);
 558         struct sk_buff *skb;
 559         int err = -ENOBUFS;
 560
 561         skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
 562         if (skb == NULL)
 563                 goto errout;
 564
 565         err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
 566         if (err < 0) {
 567                 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
 568                 WARN_ON(err == -EMSGSIZE);
 569                 kfree_skb(skb);
 570                 goto errout;
 571         }
 572         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 573         return;
 574 errout:
 575         if (err < 0)
 576                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 577 }
 578
 579 /* Dump information about entries, in response to GETNEIGH */
 580 int br_fdb_dump(struct sk_buff *skb,
 581                 struct netlink_callback *cb,
 582                 struct net_device *dev,
 583                 int idx)
 584 {
 585         struct net_bridge *br = netdev_priv(dev);
 586         int i;
 587
 588         if (!(dev->priv_flags & IFF_EBRIDGE))
 589                 goto out;
 590
 591         for (i = 0; i < BR_HASH_SIZE; i++) {
 592                 struct net_bridge_fdb_entry *f;
 593
 594                 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
 595                         if (idx < cb->args[0])
 596                                 goto skip;
 597
 598                         if (fdb_fill_info(skb, br, f,
 599                                           NETLINK_CB(cb->skb).portid,
 600                                           cb->nlh->nlmsg_seq,
 601                                           RTM_NEWNEIGH,
 602                                           NLM_F_MULTI) < 0)
 603                                 break;
 604 skip:
 605                         ++idx;
 606                 }
 607         }
 608
 609 out:
 610         return idx;
 611 }
 612
 613 /* Update (create or replace) forwarding database entry */
 614 static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
 615                          __u16 state, __u16 flags, __u16 vid)
 616 {
 617         struct net_bridge *br = source->br;
 618         struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
 619         struct net_bridge_fdb_entry *fdb;
 620
 621         fdb = fdb_find(head, addr, vid);
 622         if (fdb == NULL) {
 623                 if (!(flags & NLM_F_CREATE))
 624                         return -ENOENT;
 625
 626                 fdb = fdb_create(head, source, addr, vid);
 627                 if (!fdb)
 628                         return -ENOMEM;
 629                 fdb_notify(br, fdb, RTM_NEWNEIGH);
 630         } else {
 631                 if (flags & NLM_F_EXCL)
 632                         return -EEXIST;
 633         }
 634
 635         if (fdb_to_nud(fdb) != state) {
 636                 if (state & NUD_PERMANENT)
 637                         fdb->is_local = fdb->is_static = 1;
 638                 else if (state & NUD_NOARP) {
 639                         fdb->is_local = 0;
 640                         fdb->is_static = 1;
 641                 } else
 642                         fdb->is_local = fdb->is_static = 0;
 643
 644                 fdb->updated = fdb->used = jiffies;
 645                 fdb_notify(br, fdb, RTM_NEWNEIGH);
 646         }
 647
 648         return 0;
 649 }
 650
 651 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p,
 652                const unsigned char *addr, u16 nlh_flags, u16 vid)
 653 {
 654         int err = 0;
 655
 656         if (ndm->ndm_flags & NTF_USE) {
 657                 rcu_read_lock();
 658                 br_fdb_update(p->br, p, addr, vid);
 659                 rcu_read_unlock();
 660         } else {
 661                 spin_lock_bh(&p->br->hash_lock);
 662                 err = fdb_add_entry(p, addr, ndm->ndm_state,
 663                                     nlh_flags, vid);
 664                 spin_unlock_bh(&p->br->hash_lock);
 665         }
 666
 667         return err;
 668 }
 669
 670 /* Add new permanent fdb entry with RTM_NEWNEIGH */
 671 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 672                struct net_device *dev,
 673                const unsigned char *addr, u16 nlh_flags)
 674 {
 675         struct net_bridge_port *p;
 676         int err = 0;
 677         struct net_port_vlans *pv;
 678         unsigned short vid = VLAN_N_VID;
 679
 680         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
 681                 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
 682                 return -EINVAL;
 683         }
 684
 685         if (tb[NDA_VLAN]) {
 686                 if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) {
 687                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n");
 688                         return -EINVAL;
 689                 }
 690
 691                 vid = nla_get_u16(tb[NDA_VLAN]);
 692
 693                 if (vid >= VLAN_N_VID) {
 694                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n",
 695                                 vid);
 696                         return -EINVAL;
 697                 }
 698         }
 699
 700         p = br_port_get_rtnl(dev);
 701         if (p == NULL) {
 702                 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
 703                         dev->name);
 704                 return -EINVAL;
 705         }
 706
 707         pv = nbp_get_vlan_info(p);
 708         if (vid != VLAN_N_VID) {
 709                 if (!pv || !test_bit(vid, pv->vlan_bitmap)) {
 710                         pr_info("bridge: RTM_NEWNEIGH with unconfigured "
 711                                 "vlan %d on port %s\n", vid, dev->name);
 712                         return -EINVAL;
 713                 }
 714
 715                 /* VID was specified, so use it. */
 716                 err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
 717         } else {
 718                 if (!pv || bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN)) {
 719                         err = __br_fdb_add(ndm, p, addr, nlh_flags, 0);
 720                         goto out;
 721                 }
 722
 723                 /* We have vlans configured on this port and user didn't
 724                  * specify a VLAN.  To be nice, add/update entry for every
 725                  * vlan on this port.
 726                  */
 727                 vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN);
 728                 while (vid < BR_VLAN_BITMAP_LEN) {
 729                         err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
 730                         if (err)
 731                                 goto out;
 732                         vid = find_next_bit(pv->vlan_bitmap,
 733                                             BR_VLAN_BITMAP_LEN, vid+1);
 734                 }
 735         }
 736
 737 out:
 738         return err;
 739 }
 740
 741 int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr,
 742                        u16 vlan)
 743 {
 744         struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)];
 745         struct net_bridge_fdb_entry *fdb;
 746
 747         fdb = fdb_find(head, addr, vlan);
 748         if (!fdb)
 749                 return -ENOENT;
 750
 751         fdb_delete(br, fdb);
 752         return 0;
 753 }
 754
 755 static int __br_fdb_delete(struct net_bridge_port *p,
 756                            const unsigned char *addr, u16 vid)
 757 {
 758         int err;
 759
 760         spin_lock_bh(&p->br->hash_lock);
 761         err = fdb_delete_by_addr(p->br, addr, vid);
 762         spin_unlock_bh(&p->br->hash_lock);
 763
 764         return err;
 765 }
 766
 767 /* Remove neighbor entry with RTM_DELNEIGH */
 768 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 769                   struct net_device *dev,
 770                   const unsigned char *addr)
 771 {
 772         struct net_bridge_port *p;
 773         int err;
 774         struct net_port_vlans *pv;
 775         unsigned short vid = VLAN_N_VID;
 776
 777         if (tb[NDA_VLAN]) {
 778                 if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) {
 779                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n");
 780                         return -EINVAL;
 781                 }
 782
 783                 vid = nla_get_u16(tb[NDA_VLAN]);
 784
 785                 if (vid >= VLAN_N_VID) {
 786                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n",
 787                                 vid);
 788                         return -EINVAL;
 789                 }
 790         }
 791         p = br_port_get_rtnl(dev);
 792         if (p == NULL) {
 793                 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
 794                         dev->name);
 795                 return -EINVAL;
 796         }
 797
 798         pv = nbp_get_vlan_info(p);
 799         if (vid != VLAN_N_VID) {
 800                 if (!pv || !test_bit(vid, pv->vlan_bitmap)) {
 801                         pr_info("bridge: RTM_DELNEIGH with unconfigured "
 802                                 "vlan %d on port %s\n", vid, dev->name);
 803                         return -EINVAL;
 804                 }
 805
 806                 err = __br_fdb_delete(p, addr, vid);
 807         } else {
 808                 if (!pv || bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN)) {
 809                         err = __br_fdb_delete(p, addr, 0);
 810                         goto out;
 811                 }
 812
 813                 /* We have vlans configured on this port and user didn't
 814                  * specify a VLAN.  To be nice, add/update entry for every
 815                  * vlan on this port.
 816                  */
 817                 err = -ENOENT;
 818                 vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN);
 819                 while (vid < BR_VLAN_BITMAP_LEN) {
 820                         err &= __br_fdb_delete(p, addr, vid);
 821                         vid = find_next_bit(pv->vlan_bitmap,
 822                                             BR_VLAN_BITMAP_LEN, vid+1);
 823                 }
 824         }
 825 out:
 826         return err;
 827 }