Pileus Git - ~andy/linux/blob - 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 && !f->added_by_user) {
 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                                                 f->added_by_user = 0;
 251                                                 goto skip_delete;
 252                                         }
 253                                 }
 254                         }
 255
 256                         fdb_delete(br, f);
 257                 skip_delete: ;
 258                 }
 259         }
 260         spin_unlock_bh(&br->hash_lock);
 261 }
 262
 263 /* No locking or refcounting, assumes caller has rcu_read_lock */
 264 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 265                                           const unsigned char *addr,
 266                                           __u16 vid)
 267 {
 268         struct net_bridge_fdb_entry *fdb;
 269
 270         hlist_for_each_entry_rcu(fdb,
 271                                 &br->hash[br_mac_hash(addr, vid)], hlist) {
 272                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 273                     fdb->vlan_id == vid) {
 274                         if (unlikely(has_expired(br, fdb)))
 275                                 break;
 276                         return fdb;
 277                 }
 278         }
 279
 280         return NULL;
 281 }
 282
 283 #if IS_ENABLED(CONFIG_ATM_LANE)
 284 /* Interface used by ATM LANE hook to test
 285  * if an addr is on some other bridge port */
 286 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
 287 {
 288         struct net_bridge_fdb_entry *fdb;
 289         struct net_bridge_port *port;
 290         int ret;
 291
 292         rcu_read_lock();
 293         port = br_port_get_rcu(dev);
 294         if (!port)
 295                 ret = 0;
 296         else {
 297                 fdb = __br_fdb_get(port->br, addr, 0);
 298                 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
 299                         fdb->dst->state == BR_STATE_FORWARDING;
 300         }
 301         rcu_read_unlock();
 302
 303         return ret;
 304 }
 305 #endif /* CONFIG_ATM_LANE */
 306
 307 /*
 308  * Fill buffer with forwarding table records in
 309  * the API format.
 310  */
 311 int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 312                    unsigned long maxnum, unsigned long skip)
 313 {
 314         struct __fdb_entry *fe = buf;
 315         int i, num = 0;
 316         struct net_bridge_fdb_entry *f;
 317
 318         memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
 319
 320         rcu_read_lock();
 321         for (i = 0; i < BR_HASH_SIZE; i++) {
 322                 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
 323                         if (num >= maxnum)
 324                                 goto out;
 325
 326                         if (has_expired(br, f))
 327                                 continue;
 328
 329                         /* ignore pseudo entry for local MAC address */
 330                         if (!f->dst)
 331                                 continue;
 332
 333                         if (skip) {
 334                                 --skip;
 335                                 continue;
 336                         }
 337
 338                         /* convert from internal format to API */
 339                         memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
 340
 341                         /* due to ABI compat need to split into hi/lo */
 342                         fe->port_no = f->dst->port_no;
 343                         fe->port_hi = f->dst->port_no >> 8;
 344
 345                         fe->is_local = f->is_local;
 346                         if (!f->is_static)
 347                                 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
 348                         ++fe;
 349                         ++num;
 350                 }
 351         }
 352
 353  out:
 354         rcu_read_unlock();
 355
 356         return num;
 357 }
 358
 359 static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
 360                                              const unsigned char *addr,
 361                                              __u16 vid)
 362 {
 363         struct net_bridge_fdb_entry *fdb;
 364
 365         hlist_for_each_entry(fdb, head, hlist) {
 366                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 367                     fdb->vlan_id == vid)
 368                         return fdb;
 369         }
 370         return NULL;
 371 }
 372
 373 static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
 374                                                  const unsigned char *addr,
 375                                                  __u16 vid)
 376 {
 377         struct net_bridge_fdb_entry *fdb;
 378
 379         hlist_for_each_entry_rcu(fdb, head, hlist) {
 380                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 381                     fdb->vlan_id == vid)
 382                         return fdb;
 383         }
 384         return NULL;
 385 }
 386
 387 static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
 388                                                struct net_bridge_port *source,
 389                                                const unsigned char *addr,
 390                                                __u16 vid)
 391 {
 392         struct net_bridge_fdb_entry *fdb;
 393
 394         fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
 395         if (fdb) {
 396                 memcpy(fdb->addr.addr, addr, ETH_ALEN);
 397                 fdb->dst = source;
 398                 fdb->vlan_id = vid;
 399                 fdb->is_local = 0;
 400                 fdb->is_static = 0;
 401                 fdb->added_by_user = 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 ? source->dev->name : br->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, bool added_by_user)
 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                         if (unlikely(added_by_user))
 479                                 fdb->added_by_user = 1;
 480                 }
 481         } else {
 482                 spin_lock(&br->hash_lock);
 483                 if (likely(!fdb_find(head, addr, vid))) {
 484                         fdb = fdb_create(head, source, addr, vid);
 485                         if (fdb) {
 486                                 if (unlikely(added_by_user))
 487                                         fdb->added_by_user = 1;
 488                                 fdb_notify(br, fdb, RTM_NEWNEIGH);
 489                         }
 490                 }
 491                 /* else  we lose race and someone else inserts
 492                  * it first, don't bother updating
 493                  */
 494                 spin_unlock(&br->hash_lock);
 495         }
 496 }
 497
 498 static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb)
 499 {
 500         if (fdb->is_local)
 501                 return NUD_PERMANENT;
 502         else if (fdb->is_static)
 503                 return NUD_NOARP;
 504         else if (has_expired(fdb->dst->br, fdb))
 505                 return NUD_STALE;
 506         else
 507                 return NUD_REACHABLE;
 508 }
 509
 510 static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
 511                          const struct net_bridge_fdb_entry *fdb,
 512                          u32 portid, u32 seq, int type, unsigned int flags)
 513 {
 514         unsigned long now = jiffies;
 515         struct nda_cacheinfo ci;
 516         struct nlmsghdr *nlh;
 517         struct ndmsg *ndm;
 518
 519         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 520         if (nlh == NULL)
 521                 return -EMSGSIZE;
 522
 523         ndm = nlmsg_data(nlh);
 524         ndm->ndm_family  = AF_BRIDGE;
 525         ndm->ndm_pad1    = 0;
 526         ndm->ndm_pad2    = 0;
 527         ndm->ndm_flags   = 0;
 528         ndm->ndm_type    = 0;
 529         ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
 530         ndm->ndm_state   = fdb_to_nud(fdb);
 531
 532         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr))
 533                 goto nla_put_failure;
 534         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 535         ci.ndm_confirmed = 0;
 536         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 537         ci.ndm_refcnt    = 0;
 538         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 539                 goto nla_put_failure;
 540
 541         if (nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id))
 542                 goto nla_put_failure;
 543
 544         return nlmsg_end(skb, nlh);
 545
 546 nla_put_failure:
 547         nlmsg_cancel(skb, nlh);
 548         return -EMSGSIZE;
 549 }
 550
 551 static inline size_t fdb_nlmsg_size(void)
 552 {
 553         return NLMSG_ALIGN(sizeof(struct ndmsg))
 554                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 555                 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
 556                 + nla_total_size(sizeof(struct nda_cacheinfo));
 557 }
 558
 559 static void fdb_notify(struct net_bridge *br,
 560                        const struct net_bridge_fdb_entry *fdb, int type)
 561 {
 562         struct net *net = dev_net(br->dev);
 563         struct sk_buff *skb;
 564         int err = -ENOBUFS;
 565
 566         skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
 567         if (skb == NULL)
 568                 goto errout;
 569
 570         err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
 571         if (err < 0) {
 572                 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
 573                 WARN_ON(err == -EMSGSIZE);
 574                 kfree_skb(skb);
 575                 goto errout;
 576         }
 577         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 578         return;
 579 errout:
 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 net_bridge_fdb_entry *f;
 597
 598                 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
 599                         if (idx < cb->args[0])
 600                                 goto skip;
 601
 602                         if (fdb_fill_info(skb, br, f,
 603                                           NETLINK_CB(cb->skb).portid,
 604                                           cb->nlh->nlmsg_seq,
 605                                           RTM_NEWNEIGH,
 606                                           NLM_F_MULTI) < 0)
 607                                 break;
 608 skip:
 609                         ++idx;
 610                 }
 611         }
 612
 613 out:
 614         return idx;
 615 }
 616
 617 /* Update (create or replace) forwarding database entry */
 618 static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
 619                          __u16 state, __u16 flags, __u16 vid)
 620 {
 621         struct net_bridge *br = source->br;
 622         struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
 623         struct net_bridge_fdb_entry *fdb;
 624         bool modified = false;
 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
 635                 modified = true;
 636         } else {
 637                 if (flags & NLM_F_EXCL)
 638                         return -EEXIST;
 639
 640                 if (fdb->dst != source) {
 641                         fdb->dst = source;
 642                         modified = true;
 643                 }
 644         }
 645
 646         if (fdb_to_nud(fdb) != state) {
 647                 if (state & NUD_PERMANENT)
 648                         fdb->is_local = fdb->is_static = 1;
 649                 else if (state & NUD_NOARP) {
 650                         fdb->is_local = 0;
 651                         fdb->is_static = 1;
 652                 } else
 653                         fdb->is_local = fdb->is_static = 0;
 654
 655                 modified = true;
 656         }
 657         fdb->added_by_user = 1;
 658
 659         fdb->used = jiffies;
 660         if (modified) {
 661                 fdb->updated = jiffies;
 662                 fdb_notify(br, fdb, RTM_NEWNEIGH);
 663         }
 664
 665         return 0;
 666 }
 667
 668 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p,
 669                const unsigned char *addr, u16 nlh_flags, u16 vid)
 670 {
 671         int err = 0;
 672
 673         if (ndm->ndm_flags & NTF_USE) {
 674                 rcu_read_lock();
 675                 br_fdb_update(p->br, p, addr, vid, true);
 676                 rcu_read_unlock();
 677         } else {
 678                 spin_lock_bh(&p->br->hash_lock);
 679                 err = fdb_add_entry(p, addr, ndm->ndm_state,
 680                                     nlh_flags, vid);
 681                 spin_unlock_bh(&p->br->hash_lock);
 682         }
 683
 684         return err;
 685 }
 686
 687 /* Add new permanent fdb entry with RTM_NEWNEIGH */
 688 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 689                struct net_device *dev,
 690                const unsigned char *addr, u16 nlh_flags)
 691 {
 692         struct net_bridge_port *p;
 693         int err = 0;
 694         struct net_port_vlans *pv;
 695         unsigned short vid = VLAN_N_VID;
 696
 697         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
 698                 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
 699                 return -EINVAL;
 700         }
 701
 702         if (tb[NDA_VLAN]) {
 703                 if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) {
 704                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n");
 705                         return -EINVAL;
 706                 }
 707
 708                 vid = nla_get_u16(tb[NDA_VLAN]);
 709
 710                 if (!vid || vid >= VLAN_VID_MASK) {
 711                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n",
 712                                 vid);
 713                         return -EINVAL;
 714                 }
 715         }
 716
 717         if (is_zero_ether_addr(addr)) {
 718                 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
 719                 return -EINVAL;
 720         }
 721
 722         p = br_port_get_rtnl(dev);
 723         if (p == NULL) {
 724                 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
 725                         dev->name);
 726                 return -EINVAL;
 727         }
 728
 729         pv = nbp_get_vlan_info(p);
 730         if (vid != VLAN_N_VID) {
 731                 if (!pv || !test_bit(vid, pv->vlan_bitmap)) {
 732                         pr_info("bridge: RTM_NEWNEIGH with unconfigured "
 733                                 "vlan %d on port %s\n", vid, dev->name);
 734                         return -EINVAL;
 735                 }
 736
 737                 /* VID was specified, so use it. */
 738                 err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
 739         } else {
 740                 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID)) {
 741                         err = __br_fdb_add(ndm, p, addr, nlh_flags, 0);
 742                         goto out;
 743                 }
 744
 745                 /* We have vlans configured on this port and user didn't
 746                  * specify a VLAN.  To be nice, add/update entry for every
 747                  * vlan on this port.
 748                  */
 749                 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
 750                         err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
 751                         if (err)
 752                                 goto out;
 753                 }
 754         }
 755
 756 out:
 757         return err;
 758 }
 759
 760 int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr,
 761                        u16 vlan)
 762 {
 763         struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)];
 764         struct net_bridge_fdb_entry *fdb;
 765
 766         fdb = fdb_find(head, addr, vlan);
 767         if (!fdb)
 768                 return -ENOENT;
 769
 770         fdb_delete(br, fdb);
 771         return 0;
 772 }
 773
 774 static int __br_fdb_delete(struct net_bridge_port *p,
 775                            const unsigned char *addr, u16 vid)
 776 {
 777         int err;
 778
 779         spin_lock_bh(&p->br->hash_lock);
 780         err = fdb_delete_by_addr(p->br, addr, vid);
 781         spin_unlock_bh(&p->br->hash_lock);
 782
 783         return err;
 784 }
 785
 786 /* Remove neighbor entry with RTM_DELNEIGH */
 787 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 788                   struct net_device *dev,
 789                   const unsigned char *addr)
 790 {
 791         struct net_bridge_port *p;
 792         int err;
 793         struct net_port_vlans *pv;
 794         unsigned short vid = VLAN_N_VID;
 795
 796         if (tb[NDA_VLAN]) {
 797                 if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) {
 798                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n");
 799                         return -EINVAL;
 800                 }
 801
 802                 vid = nla_get_u16(tb[NDA_VLAN]);
 803
 804                 if (!vid || vid >= VLAN_VID_MASK) {
 805                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n",
 806                                 vid);
 807                         return -EINVAL;
 808                 }
 809         }
 810         p = br_port_get_rtnl(dev);
 811         if (p == NULL) {
 812                 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
 813                         dev->name);
 814                 return -EINVAL;
 815         }
 816
 817         pv = nbp_get_vlan_info(p);
 818         if (vid != VLAN_N_VID) {
 819                 if (!pv || !test_bit(vid, pv->vlan_bitmap)) {
 820                         pr_info("bridge: RTM_DELNEIGH with unconfigured "
 821                                 "vlan %d on port %s\n", vid, dev->name);
 822                         return -EINVAL;
 823                 }
 824
 825                 err = __br_fdb_delete(p, addr, vid);
 826         } else {
 827                 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID)) {
 828                         err = __br_fdb_delete(p, addr, 0);
 829                         goto out;
 830                 }
 831
 832                 /* We have vlans configured on this port and user didn't
 833                  * specify a VLAN.  To be nice, add/update entry for every
 834                  * vlan on this port.
 835                  */
 836                 err = -ENOENT;
 837                 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
 838                         err &= __br_fdb_delete(p, addr, vid);
 839                 }
 840         }
 841 out:
 842         return err;
 843 }