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 *h, *n;
 185
 186                 hlist_for_each_entry_safe(f, h, 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 *h, *n;
 211                 hlist_for_each_entry_safe(f, h, 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 hlist_node *h;
 270         struct net_bridge_fdb_entry *fdb;
 271
 272         hlist_for_each_entry_rcu(fdb, h,
 273                                 &br->hash[br_mac_hash(addr, vid)], hlist) {
 274                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 275                     fdb->vlan_id == vid) {
 276                         if (unlikely(has_expired(br, fdb)))
 277                                 break;
 278                         return fdb;
 279                 }
 280         }
 281
 282         return NULL;
 283 }
 284
 285 #if IS_ENABLED(CONFIG_ATM_LANE)
 286 /* Interface used by ATM LANE hook to test
 287  * if an addr is on some other bridge port */
 288 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
 289 {
 290         struct net_bridge_fdb_entry *fdb;
 291         struct net_bridge_port *port;
 292         int ret;
 293
 294         rcu_read_lock();
 295         port = br_port_get_rcu(dev);
 296         if (!port)
 297                 ret = 0;
 298         else {
 299                 fdb = __br_fdb_get(port->br, addr, 0);
 300                 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
 301                         fdb->dst->state == BR_STATE_FORWARDING;
 302         }
 303         rcu_read_unlock();
 304
 305         return ret;
 306 }
 307 #endif /* CONFIG_ATM_LANE */
 308
 309 /*
 310  * Fill buffer with forwarding table records in
 311  * the API format.
 312  */
 313 int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 314                    unsigned long maxnum, unsigned long skip)
 315 {
 316         struct __fdb_entry *fe = buf;
 317         int i, num = 0;
 318         struct hlist_node *h;
 319         struct net_bridge_fdb_entry *f;
 320
 321         memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
 322
 323         rcu_read_lock();
 324         for (i = 0; i < BR_HASH_SIZE; i++) {
 325                 hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
 326                         if (num >= maxnum)
 327                                 goto out;
 328
 329                         if (has_expired(br, f))
 330                                 continue;
 331
 332                         /* ignore pseudo entry for local MAC address */
 333                         if (!f->dst)
 334                                 continue;
 335
 336                         if (skip) {
 337                                 --skip;
 338                                 continue;
 339                         }
 340
 341                         /* convert from internal format to API */
 342                         memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
 343
 344                         /* due to ABI compat need to split into hi/lo */
 345                         fe->port_no = f->dst->port_no;
 346                         fe->port_hi = f->dst->port_no >> 8;
 347
 348                         fe->is_local = f->is_local;
 349                         if (!f->is_static)
 350                                 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
 351                         ++fe;
 352                         ++num;
 353                 }
 354         }
 355
 356  out:
 357         rcu_read_unlock();
 358
 359         return num;
 360 }
 361
 362 static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
 363                                              const unsigned char *addr,
 364                                              __u16 vid)
 365 {
 366         struct hlist_node *h;
 367         struct net_bridge_fdb_entry *fdb;
 368
 369         hlist_for_each_entry(fdb, h, head, hlist) {
 370                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 371                     fdb->vlan_id == vid)
 372                         return fdb;
 373         }
 374         return NULL;
 375 }
 376
 377 static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
 378                                                  const unsigned char *addr,
 379                                                  __u16 vid)
 380 {
 381         struct hlist_node *h;
 382         struct net_bridge_fdb_entry *fdb;
 383
 384         hlist_for_each_entry_rcu(fdb, h, head, hlist) {
 385                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 386                     fdb->vlan_id == vid)
 387                         return fdb;
 388         }
 389         return NULL;
 390 }
 391
 392 static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
 393                                                struct net_bridge_port *source,
 394                                                const unsigned char *addr,
 395                                                __u16 vid)
 396 {
 397         struct net_bridge_fdb_entry *fdb;
 398
 399         fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
 400         if (fdb) {
 401                 memcpy(fdb->addr.addr, addr, ETH_ALEN);
 402                 fdb->dst = source;
 403                 fdb->vlan_id = vid;
 404                 fdb->is_local = 0;
 405                 fdb->is_static = 0;
 406                 fdb->updated = fdb->used = jiffies;
 407                 hlist_add_head_rcu(&fdb->hlist, head);
 408         }
 409         return fdb;
 410 }
 411
 412 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 413                   const unsigned char *addr, u16 vid)
 414 {
 415         struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
 416         struct net_bridge_fdb_entry *fdb;
 417
 418         if (!is_valid_ether_addr(addr))
 419                 return -EINVAL;
 420
 421         fdb = fdb_find(head, addr, vid);
 422         if (fdb) {
 423                 /* it is okay to have multiple ports with same
 424                  * address, just use the first one.
 425                  */
 426                 if (fdb->is_local)
 427                         return 0;
 428                 br_warn(br, "adding interface %s with same address "
 429                        "as a received packet\n",
 430                        source->dev->name);
 431                 fdb_delete(br, fdb);
 432         }
 433
 434         fdb = fdb_create(head, source, addr, vid);
 435         if (!fdb)
 436                 return -ENOMEM;
 437
 438         fdb->is_local = fdb->is_static = 1;
 439         fdb_notify(br, fdb, RTM_NEWNEIGH);
 440         return 0;
 441 }
 442
 443 /* Add entry for local address of interface */
 444 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 445                   const unsigned char *addr, u16 vid)
 446 {
 447         int ret;
 448
 449         spin_lock_bh(&br->hash_lock);
 450         ret = fdb_insert(br, source, addr, vid);
 451         spin_unlock_bh(&br->hash_lock);
 452         return ret;
 453 }
 454
 455 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 456                    const unsigned char *addr, u16 vid)
 457 {
 458         struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
 459         struct net_bridge_fdb_entry *fdb;
 460
 461         /* some users want to always flood. */
 462         if (hold_time(br) == 0)
 463                 return;
 464
 465         /* ignore packets unless we are using this port */
 466         if (!(source->state == BR_STATE_LEARNING ||
 467               source->state == BR_STATE_FORWARDING))
 468                 return;
 469
 470         fdb = fdb_find_rcu(head, addr, vid);
 471         if (likely(fdb)) {
 472                 /* attempt to update an entry for a local interface */
 473                 if (unlikely(fdb->is_local)) {
 474                         if (net_ratelimit())
 475                                 br_warn(br, "received packet on %s with "
 476                                         "own address as source address\n",
 477                                         source->dev->name);
 478                 } else {
 479                         /* fastpath: update of existing entry */
 480                         fdb->dst = source;
 481                         fdb->updated = jiffies;
 482                 }
 483         } else {
 484                 spin_lock(&br->hash_lock);
 485                 if (likely(!fdb_find(head, addr, vid))) {
 486                         fdb = fdb_create(head, source, addr, vid);
 487                         if (fdb)
 488                                 fdb_notify(br, fdb, RTM_NEWNEIGH);
 489                 }
 490                 /* else  we lose race and someone else inserts
 491                  * it first, don't bother updating
 492                  */
 493                 spin_unlock(&br->hash_lock);
 494         }
 495 }
 496
 497 static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb)
 498 {
 499         if (fdb->is_local)
 500                 return NUD_PERMANENT;
 501         else if (fdb->is_static)
 502                 return NUD_NOARP;
 503         else if (has_expired(fdb->dst->br, fdb))
 504                 return NUD_STALE;
 505         else
 506                 return NUD_REACHABLE;
 507 }
 508
 509 static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
 510                          const struct net_bridge_fdb_entry *fdb,
 511                          u32 portid, u32 seq, int type, unsigned int flags)
 512 {
 513         unsigned long now = jiffies;
 514         struct nda_cacheinfo ci;
 515         struct nlmsghdr *nlh;
 516         struct ndmsg *ndm;
 517
 518         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 519         if (nlh == NULL)
 520                 return -EMSGSIZE;
 521
 522         ndm = nlmsg_data(nlh);
 523         ndm->ndm_family  = AF_BRIDGE;
 524         ndm->ndm_pad1    = 0;
 525         ndm->ndm_pad2    = 0;
 526         ndm->ndm_flags   = 0;
 527         ndm->ndm_type    = 0;
 528         ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
 529         ndm->ndm_state   = fdb_to_nud(fdb);
 530
 531         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr))
 532                 goto nla_put_failure;
 533         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 534         ci.ndm_confirmed = 0;
 535         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 536         ci.ndm_refcnt    = 0;
 537         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 538                 goto nla_put_failure;
 539
 540         if (nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id))
 541                 goto nla_put_failure;
 542
 543         return nlmsg_end(skb, nlh);
 544
 545 nla_put_failure:
 546         nlmsg_cancel(skb, nlh);
 547         return -EMSGSIZE;
 548 }
 549
 550 static inline size_t fdb_nlmsg_size(void)
 551 {
 552         return NLMSG_ALIGN(sizeof(struct ndmsg))
 553                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 554                 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
 555                 + nla_total_size(sizeof(struct nda_cacheinfo));
 556 }
 557
 558 static void fdb_notify(struct net_bridge *br,
 559                        const struct net_bridge_fdb_entry *fdb, int type)
 560 {
 561         struct net *net = dev_net(br->dev);
 562         struct sk_buff *skb;
 563         int err = -ENOBUFS;
 564
 565         skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
 566         if (skb == NULL)
 567                 goto errout;
 568
 569         err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
 570         if (err < 0) {
 571                 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
 572                 WARN_ON(err == -EMSGSIZE);
 573                 kfree_skb(skb);
 574                 goto errout;
 575         }
 576         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 577         return;
 578 errout:
 579         if (err < 0)
 580                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 581 }
 582
 583 /* Dump information about entries, in response to GETNEIGH */
 584 int br_fdb_dump(struct sk_buff *skb,
 585                 struct netlink_callback *cb,
 586                 struct net_device *dev,
 587                 int idx)
 588 {
 589         struct net_bridge *br = netdev_priv(dev);
 590         int i;
 591
 592         if (!(dev->priv_flags & IFF_EBRIDGE))
 593                 goto out;
 594
 595         for (i = 0; i < BR_HASH_SIZE; i++) {
 596                 struct hlist_node *h;
 597                 struct net_bridge_fdb_entry *f;
 598
 599                 hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
 600                         if (idx < cb->args[0])
 601                                 goto skip;
 602
 603                         if (fdb_fill_info(skb, br, f,
 604                                           NETLINK_CB(cb->skb).portid,
 605                                           cb->nlh->nlmsg_seq,
 606                                           RTM_NEWNEIGH,
 607                                           NLM_F_MULTI) < 0)
 608                                 break;
 609 skip:
 610                         ++idx;
 611                 }
 612         }
 613
 614 out:
 615         return idx;
 616 }
 617
 618 /* Update (create or replace) forwarding database entry */
 619 static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
 620                          __u16 state, __u16 flags, __u16 vid)
 621 {
 622         struct net_bridge *br = source->br;
 623         struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
 624         struct net_bridge_fdb_entry *fdb;
 625
 626         fdb = fdb_find(head, addr, vid);
 627         if (fdb == NULL) {
 628                 if (!(flags & NLM_F_CREATE))
 629                         return -ENOENT;
 630
 631                 fdb = fdb_create(head, source, addr, vid);
 632                 if (!fdb)
 633                         return -ENOMEM;
 634                 fdb_notify(br, fdb, RTM_NEWNEIGH);
 635         } else {
 636                 if (flags & NLM_F_EXCL)
 637                         return -EEXIST;
 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                 fdb->updated = fdb->used = jiffies;
 650                 fdb_notify(br, fdb, RTM_NEWNEIGH);
 651         }
 652
 653         return 0;
 654 }
 655
 656 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p,
 657                const unsigned char *addr, u16 nlh_flags, u16 vid)
 658 {
 659         int err = 0;
 660
 661         if (ndm->ndm_flags & NTF_USE) {
 662                 rcu_read_lock();
 663                 br_fdb_update(p->br, p, addr, vid);
 664                 rcu_read_unlock();
 665         } else {
 666                 spin_lock_bh(&p->br->hash_lock);
 667                 err = fdb_add_entry(p, addr, ndm->ndm_state,
 668                                     nlh_flags, vid);
 669                 spin_unlock_bh(&p->br->hash_lock);
 670         }
 671
 672         return err;
 673 }
 674
 675 /* Add new permanent fdb entry with RTM_NEWNEIGH */
 676 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 677                struct net_device *dev,
 678                const unsigned char *addr, u16 nlh_flags)
 679 {
 680         struct net_bridge_port *p;
 681         int err = 0;
 682         struct net_port_vlans *pv;
 683         unsigned short vid = VLAN_N_VID;
 684
 685         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
 686                 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
 687                 return -EINVAL;
 688         }
 689
 690         if (tb[NDA_VLAN]) {
 691                 if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) {
 692                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n");
 693                         return -EINVAL;
 694                 }
 695
 696                 vid = nla_get_u16(tb[NDA_VLAN]);
 697
 698                 if (vid >= VLAN_N_VID) {
 699                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n",
 700                                 vid);
 701                         return -EINVAL;
 702                 }
 703         }
 704
 705         p = br_port_get_rtnl(dev);
 706         if (p == NULL) {
 707                 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
 708                         dev->name);
 709                 return -EINVAL;
 710         }
 711
 712         pv = nbp_get_vlan_info(p);
 713         if (vid != VLAN_N_VID) {
 714                 if (!pv || !test_bit(vid, pv->vlan_bitmap)) {
 715                         pr_info("bridge: RTM_NEWNEIGH with unconfigured "
 716                                 "vlan %d on port %s\n", vid, dev->name);
 717                         return -EINVAL;
 718                 }
 719
 720                 /* VID was specified, so use it. */
 721                 err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
 722         } else {
 723                 if (!pv || bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN)) {
 724                         err = __br_fdb_add(ndm, p, addr, nlh_flags, 0);
 725                         goto out;
 726                 }
 727
 728                 /* We have vlans configured on this port and user didn't
 729                  * specify a VLAN.  To be nice, add/update entry for every
 730                  * vlan on this port.
 731                  */
 732                 vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN);
 733                 while (vid < BR_VLAN_BITMAP_LEN) {
 734                         err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
 735                         if (err)
 736                                 goto out;
 737                         vid = find_next_bit(pv->vlan_bitmap,
 738                                             BR_VLAN_BITMAP_LEN, vid+1);
 739                 }
 740         }
 741
 742 out:
 743         return err;
 744 }
 745
 746 int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr,
 747                        u16 vlan)
 748 {
 749         struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)];
 750         struct net_bridge_fdb_entry *fdb;
 751
 752         fdb = fdb_find(head, addr, vlan);
 753         if (!fdb)
 754                 return -ENOENT;
 755
 756         fdb_delete(br, fdb);
 757         return 0;
 758 }
 759
 760 static int __br_fdb_delete(struct net_bridge_port *p,
 761                            const unsigned char *addr, u16 vid)
 762 {
 763         int err;
 764
 765         spin_lock_bh(&p->br->hash_lock);
 766         err = fdb_delete_by_addr(p->br, addr, vid);
 767         spin_unlock_bh(&p->br->hash_lock);
 768
 769         return err;
 770 }
 771
 772 /* Remove neighbor entry with RTM_DELNEIGH */
 773 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 774                   struct net_device *dev,
 775                   const unsigned char *addr)
 776 {
 777         struct net_bridge_port *p;
 778         int err;
 779         struct net_port_vlans *pv;
 780         unsigned short vid = VLAN_N_VID;
 781
 782         if (tb[NDA_VLAN]) {
 783                 if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) {
 784                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n");
 785                         return -EINVAL;
 786                 }
 787
 788                 vid = nla_get_u16(tb[NDA_VLAN]);
 789
 790                 if (vid >= VLAN_N_VID) {
 791                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n",
 792                                 vid);
 793                         return -EINVAL;
 794                 }
 795         }
 796         p = br_port_get_rtnl(dev);
 797         if (p == NULL) {
 798                 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
 799                         dev->name);
 800                 return -EINVAL;
 801         }
 802
 803         pv = nbp_get_vlan_info(p);
 804         if (vid != VLAN_N_VID) {
 805                 if (!pv || !test_bit(vid, pv->vlan_bitmap)) {
 806                         pr_info("bridge: RTM_DELNEIGH with unconfigured "
 807                                 "vlan %d on port %s\n", vid, dev->name);
 808                         return -EINVAL;
 809                 }
 810
 811                 err = __br_fdb_delete(p, addr, vid);
 812         } else {
 813                 if (!pv || bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN)) {
 814                         err = __br_fdb_delete(p, addr, 0);
 815                         goto out;
 816                 }
 817
 818                 /* We have vlans configured on this port and user didn't
 819                  * specify a VLAN.  To be nice, add/update entry for every
 820                  * vlan on this port.
 821                  */
 822                 err = -ENOENT;
 823                 vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN);
 824                 while (vid < BR_VLAN_BITMAP_LEN) {
 825                         err &= __br_fdb_delete(p, addr, vid);
 826                         vid = find_next_bit(pv->vlan_bitmap,
 827                                             BR_VLAN_BITMAP_LEN, vid+1);
 828                 }
 829         }
 830 out:
 831         return err;
 832 }