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 struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
  31                                              const unsigned char *addr,
  32                                              __u16 vid);
  33 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
  34                       const unsigned char *addr, u16 vid);
  35 static void fdb_notify(struct net_bridge *br,
  36                        const struct net_bridge_fdb_entry *, int);
  37
  38 static u32 fdb_salt __read_mostly;
  39
  40 int __init br_fdb_init(void)
  41 {
  42         br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
  43                                          sizeof(struct net_bridge_fdb_entry),
  44                                          0,
  45                                          SLAB_HWCACHE_ALIGN, NULL);
  46         if (!br_fdb_cache)
  47                 return -ENOMEM;
  48
  49         get_random_bytes(&fdb_salt, sizeof(fdb_salt));
  50         return 0;
  51 }
  52
  53 void br_fdb_fini(void)
  54 {
  55         kmem_cache_destroy(br_fdb_cache);
  56 }
  57
  58
  59 /* if topology_changing then use forward_delay (default 15 sec)
  60  * otherwise keep longer (default 5 minutes)
  61  */
  62 static inline unsigned long hold_time(const struct net_bridge *br)
  63 {
  64         return br->topology_change ? br->forward_delay : br->ageing_time;
  65 }
  66
  67 static inline int has_expired(const struct net_bridge *br,
  68                                   const struct net_bridge_fdb_entry *fdb)
  69 {
  70         return !fdb->is_static &&
  71                 time_before_eq(fdb->updated + hold_time(br), jiffies);
  72 }
  73
  74 static inline int br_mac_hash(const unsigned char *mac, __u16 vid)
  75 {
  76         /* use 1 byte of OUI and 3 bytes of NIC */
  77         u32 key = get_unaligned((u32 *)(mac + 2));
  78         return jhash_2words(key, vid, fdb_salt) & (BR_HASH_SIZE - 1);
  79 }
  80
  81 static void fdb_rcu_free(struct rcu_head *head)
  82 {
  83         struct net_bridge_fdb_entry *ent
  84                 = container_of(head, struct net_bridge_fdb_entry, rcu);
  85         kmem_cache_free(br_fdb_cache, ent);
  86 }
  87
  88 static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
  89 {
  90         hlist_del_rcu(&f->hlist);
  91         fdb_notify(br, f, RTM_DELNEIGH);
  92         call_rcu(&f->rcu, fdb_rcu_free);
  93 }
  94
  95 /* Delete a local entry if no other port had the same address. */
  96 static void fdb_delete_local(struct net_bridge *br,
  97                              const struct net_bridge_port *p,
  98                              struct net_bridge_fdb_entry *f)
  99 {
 100         const unsigned char *addr = f->addr.addr;
 101         u16 vid = f->vlan_id;
 102         struct net_bridge_port *op;
 103
 104         /* Maybe another port has same hw addr? */
 105         list_for_each_entry(op, &br->port_list, list) {
 106                 if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
 107                     (!vid || nbp_vlan_find(op, vid))) {
 108                         f->dst = op;
 109                         f->added_by_user = 0;
 110                         return;
 111                 }
 112         }
 113
 114         /* Maybe bridge device has same hw addr? */
 115         if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
 116             (!vid || br_vlan_find(br, vid))) {
 117                 f->dst = NULL;
 118                 f->added_by_user = 0;
 119                 return;
 120         }
 121
 122         fdb_delete(br, f);
 123 }
 124
 125 void br_fdb_find_delete_local(struct net_bridge *br,
 126                               const struct net_bridge_port *p,
 127                               const unsigned char *addr, u16 vid)
 128 {
 129         struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
 130         struct net_bridge_fdb_entry *f;
 131
 132         spin_lock_bh(&br->hash_lock);
 133         f = fdb_find(head, addr, vid);
 134         if (f && f->is_local && !f->added_by_user && f->dst == p)
 135                 fdb_delete_local(br, p, f);
 136         spin_unlock_bh(&br->hash_lock);
 137 }
 138
 139 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
 140 {
 141         struct net_bridge *br = p->br;
 142         struct net_port_vlans *pv = nbp_get_vlan_info(p);
 143         bool no_vlan = !pv;
 144         int i;
 145         u16 vid;
 146
 147         spin_lock_bh(&br->hash_lock);
 148
 149         /* Search all chains since old address/hash is unknown */
 150         for (i = 0; i < BR_HASH_SIZE; i++) {
 151                 struct hlist_node *h;
 152                 hlist_for_each(h, &br->hash[i]) {
 153                         struct net_bridge_fdb_entry *f;
 154
 155                         f = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
 156                         if (f->dst == p && f->is_local && !f->added_by_user) {
 157                                 /* delete old one */
 158                                 fdb_delete_local(br, p, f);
 159
 160                                 /* if this port has no vlan information
 161                                  * configured, we can safely be done at
 162                                  * this point.
 163                                  */
 164                                 if (no_vlan)
 165                                         goto insert;
 166                         }
 167                 }
 168         }
 169
 170 insert:
 171         /* insert new address,  may fail if invalid address or dup. */
 172         fdb_insert(br, p, newaddr, 0);
 173
 174         if (no_vlan)
 175                 goto done;
 176
 177         /* Now add entries for every VLAN configured on the port.
 178          * This function runs under RTNL so the bitmap will not change
 179          * from under us.
 180          */
 181         for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
 182                 fdb_insert(br, p, newaddr, vid);
 183
 184 done:
 185         spin_unlock_bh(&br->hash_lock);
 186 }
 187
 188 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
 189 {
 190         struct net_bridge_fdb_entry *f;
 191         struct net_port_vlans *pv;
 192         u16 vid = 0;
 193
 194         /* If old entry was unassociated with any port, then delete it. */
 195         f = __br_fdb_get(br, br->dev->dev_addr, 0);
 196         if (f && f->is_local && !f->dst)
 197                 fdb_delete_local(br, NULL, f);
 198
 199         fdb_insert(br, NULL, newaddr, 0);
 200
 201         /* Now remove and add entries for every VLAN configured on the
 202          * bridge.  This function runs under RTNL so the bitmap will not
 203          * change from under us.
 204          */
 205         pv = br_get_vlan_info(br);
 206         if (!pv)
 207                 return;
 208
 209         for_each_set_bit_from(vid, pv->vlan_bitmap, VLAN_N_VID) {
 210                 f = __br_fdb_get(br, br->dev->dev_addr, vid);
 211                 if (f && f->is_local && !f->dst)
 212                         fdb_delete_local(br, NULL, f);
 213                 fdb_insert(br, NULL, newaddr, vid);
 214         }
 215 }
 216
 217 void br_fdb_cleanup(unsigned long _data)
 218 {
 219         struct net_bridge *br = (struct net_bridge *)_data;
 220         unsigned long delay = hold_time(br);
 221         unsigned long next_timer = jiffies + br->ageing_time;
 222         int i;
 223
 224         spin_lock(&br->hash_lock);
 225         for (i = 0; i < BR_HASH_SIZE; i++) {
 226                 struct net_bridge_fdb_entry *f;
 227                 struct hlist_node *n;
 228
 229                 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
 230                         unsigned long this_timer;
 231                         if (f->is_static)
 232                                 continue;
 233                         this_timer = f->updated + delay;
 234                         if (time_before_eq(this_timer, jiffies))
 235                                 fdb_delete(br, f);
 236                         else if (time_before(this_timer, next_timer))
 237                                 next_timer = this_timer;
 238                 }
 239         }
 240         spin_unlock(&br->hash_lock);
 241
 242         mod_timer(&br->gc_timer, round_jiffies_up(next_timer));
 243 }
 244
 245 /* Completely flush all dynamic entries in forwarding database.*/
 246 void br_fdb_flush(struct net_bridge *br)
 247 {
 248         int i;
 249
 250         spin_lock_bh(&br->hash_lock);
 251         for (i = 0; i < BR_HASH_SIZE; i++) {
 252                 struct net_bridge_fdb_entry *f;
 253                 struct hlist_node *n;
 254                 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
 255                         if (!f->is_static)
 256                                 fdb_delete(br, f);
 257                 }
 258         }
 259         spin_unlock_bh(&br->hash_lock);
 260 }
 261
 262 /* Flush all entries referring to a specific port.
 263  * if do_all is set also flush static entries
 264  */
 265 void br_fdb_delete_by_port(struct net_bridge *br,
 266                            const struct net_bridge_port *p,
 267                            int do_all)
 268 {
 269         int i;
 270
 271         spin_lock_bh(&br->hash_lock);
 272         for (i = 0; i < BR_HASH_SIZE; i++) {
 273                 struct hlist_node *h, *g;
 274
 275                 hlist_for_each_safe(h, g, &br->hash[i]) {
 276                         struct net_bridge_fdb_entry *f
 277                                 = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
 278                         if (f->dst != p)
 279                                 continue;
 280
 281                         if (f->is_static && !do_all)
 282                                 continue;
 283
 284                         if (f->is_local)
 285                                 fdb_delete_local(br, p, f);
 286                         else
 287                                 fdb_delete(br, f);
 288                 }
 289         }
 290         spin_unlock_bh(&br->hash_lock);
 291 }
 292
 293 /* No locking or refcounting, assumes caller has rcu_read_lock */
 294 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 295                                           const unsigned char *addr,
 296                                           __u16 vid)
 297 {
 298         struct net_bridge_fdb_entry *fdb;
 299
 300         hlist_for_each_entry_rcu(fdb,
 301                                 &br->hash[br_mac_hash(addr, vid)], hlist) {
 302                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 303                     fdb->vlan_id == vid) {
 304                         if (unlikely(has_expired(br, fdb)))
 305                                 break;
 306                         return fdb;
 307                 }
 308         }
 309
 310         return NULL;
 311 }
 312
 313 #if IS_ENABLED(CONFIG_ATM_LANE)
 314 /* Interface used by ATM LANE hook to test
 315  * if an addr is on some other bridge port */
 316 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
 317 {
 318         struct net_bridge_fdb_entry *fdb;
 319         struct net_bridge_port *port;
 320         int ret;
 321
 322         rcu_read_lock();
 323         port = br_port_get_rcu(dev);
 324         if (!port)
 325                 ret = 0;
 326         else {
 327                 fdb = __br_fdb_get(port->br, addr, 0);
 328                 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
 329                         fdb->dst->state == BR_STATE_FORWARDING;
 330         }
 331         rcu_read_unlock();
 332
 333         return ret;
 334 }
 335 #endif /* CONFIG_ATM_LANE */
 336
 337 /*
 338  * Fill buffer with forwarding table records in
 339  * the API format.
 340  */
 341 int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 342                    unsigned long maxnum, unsigned long skip)
 343 {
 344         struct __fdb_entry *fe = buf;
 345         int i, num = 0;
 346         struct net_bridge_fdb_entry *f;
 347
 348         memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
 349
 350         rcu_read_lock();
 351         for (i = 0; i < BR_HASH_SIZE; i++) {
 352                 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
 353                         if (num >= maxnum)
 354                                 goto out;
 355
 356                         if (has_expired(br, f))
 357                                 continue;
 358
 359                         /* ignore pseudo entry for local MAC address */
 360                         if (!f->dst)
 361                                 continue;
 362
 363                         if (skip) {
 364                                 --skip;
 365                                 continue;
 366                         }
 367
 368                         /* convert from internal format to API */
 369                         memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
 370
 371                         /* due to ABI compat need to split into hi/lo */
 372                         fe->port_no = f->dst->port_no;
 373                         fe->port_hi = f->dst->port_no >> 8;
 374
 375                         fe->is_local = f->is_local;
 376                         if (!f->is_static)
 377                                 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
 378                         ++fe;
 379                         ++num;
 380                 }
 381         }
 382
 383  out:
 384         rcu_read_unlock();
 385
 386         return num;
 387 }
 388
 389 static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
 390                                              const unsigned char *addr,
 391                                              __u16 vid)
 392 {
 393         struct net_bridge_fdb_entry *fdb;
 394
 395         hlist_for_each_entry(fdb, head, hlist) {
 396                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 397                     fdb->vlan_id == vid)
 398                         return fdb;
 399         }
 400         return NULL;
 401 }
 402
 403 static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
 404                                                  const unsigned char *addr,
 405                                                  __u16 vid)
 406 {
 407         struct net_bridge_fdb_entry *fdb;
 408
 409         hlist_for_each_entry_rcu(fdb, head, hlist) {
 410                 if (ether_addr_equal(fdb->addr.addr, addr) &&
 411                     fdb->vlan_id == vid)
 412                         return fdb;
 413         }
 414         return NULL;
 415 }
 416
 417 static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
 418                                                struct net_bridge_port *source,
 419                                                const unsigned char *addr,
 420                                                __u16 vid)
 421 {
 422         struct net_bridge_fdb_entry *fdb;
 423
 424         fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
 425         if (fdb) {
 426                 memcpy(fdb->addr.addr, addr, ETH_ALEN);
 427                 fdb->dst = source;
 428                 fdb->vlan_id = vid;
 429                 fdb->is_local = 0;
 430                 fdb->is_static = 0;
 431                 fdb->added_by_user = 0;
 432                 fdb->updated = fdb->used = jiffies;
 433                 hlist_add_head_rcu(&fdb->hlist, head);
 434         }
 435         return fdb;
 436 }
 437
 438 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 439                   const unsigned char *addr, u16 vid)
 440 {
 441         struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
 442         struct net_bridge_fdb_entry *fdb;
 443
 444         if (!is_valid_ether_addr(addr))
 445                 return -EINVAL;
 446
 447         fdb = fdb_find(head, addr, vid);
 448         if (fdb) {
 449                 /* it is okay to have multiple ports with same
 450                  * address, just use the first one.
 451                  */
 452                 if (fdb->is_local)
 453                         return 0;
 454                 br_warn(br, "adding interface %s with same address "
 455                        "as a received packet\n",
 456                        source ? source->dev->name : br->dev->name);
 457                 fdb_delete(br, fdb);
 458         }
 459
 460         fdb = fdb_create(head, source, addr, vid);
 461         if (!fdb)
 462                 return -ENOMEM;
 463
 464         fdb->is_local = fdb->is_static = 1;
 465         fdb_notify(br, fdb, RTM_NEWNEIGH);
 466         return 0;
 467 }
 468
 469 /* Add entry for local address of interface */
 470 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 471                   const unsigned char *addr, u16 vid)
 472 {
 473         int ret;
 474
 475         spin_lock_bh(&br->hash_lock);
 476         ret = fdb_insert(br, source, addr, vid);
 477         spin_unlock_bh(&br->hash_lock);
 478         return ret;
 479 }
 480
 481 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 482                    const unsigned char *addr, u16 vid, bool added_by_user)
 483 {
 484         struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
 485         struct net_bridge_fdb_entry *fdb;
 486
 487         /* some users want to always flood. */
 488         if (hold_time(br) == 0)
 489                 return;
 490
 491         /* ignore packets unless we are using this port */
 492         if (!(source->state == BR_STATE_LEARNING ||
 493               source->state == BR_STATE_FORWARDING))
 494                 return;
 495
 496         fdb = fdb_find_rcu(head, addr, vid);
 497         if (likely(fdb)) {
 498                 /* attempt to update an entry for a local interface */
 499                 if (unlikely(fdb->is_local)) {
 500                         if (net_ratelimit())
 501                                 br_warn(br, "received packet on %s with "
 502                                         "own address as source address\n",
 503                                         source->dev->name);
 504                 } else {
 505                         /* fastpath: update of existing entry */
 506                         fdb->dst = source;
 507                         fdb->updated = jiffies;
 508                         if (unlikely(added_by_user))
 509                                 fdb->added_by_user = 1;
 510                 }
 511         } else {
 512                 spin_lock(&br->hash_lock);
 513                 if (likely(!fdb_find(head, addr, vid))) {
 514                         fdb = fdb_create(head, source, addr, vid);
 515                         if (fdb) {
 516                                 if (unlikely(added_by_user))
 517                                         fdb->added_by_user = 1;
 518                                 fdb_notify(br, fdb, RTM_NEWNEIGH);
 519                         }
 520                 }
 521                 /* else  we lose race and someone else inserts
 522                  * it first, don't bother updating
 523                  */
 524                 spin_unlock(&br->hash_lock);
 525         }
 526 }
 527
 528 static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb)
 529 {
 530         if (fdb->is_local)
 531                 return NUD_PERMANENT;
 532         else if (fdb->is_static)
 533                 return NUD_NOARP;
 534         else if (has_expired(fdb->dst->br, fdb))
 535                 return NUD_STALE;
 536         else
 537                 return NUD_REACHABLE;
 538 }
 539
 540 static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
 541                          const struct net_bridge_fdb_entry *fdb,
 542                          u32 portid, u32 seq, int type, unsigned int flags)
 543 {
 544         unsigned long now = jiffies;
 545         struct nda_cacheinfo ci;
 546         struct nlmsghdr *nlh;
 547         struct ndmsg *ndm;
 548
 549         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 550         if (nlh == NULL)
 551                 return -EMSGSIZE;
 552
 553         ndm = nlmsg_data(nlh);
 554         ndm->ndm_family  = AF_BRIDGE;
 555         ndm->ndm_pad1    = 0;
 556         ndm->ndm_pad2    = 0;
 557         ndm->ndm_flags   = 0;
 558         ndm->ndm_type    = 0;
 559         ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
 560         ndm->ndm_state   = fdb_to_nud(fdb);
 561
 562         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr))
 563                 goto nla_put_failure;
 564         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 565         ci.ndm_confirmed = 0;
 566         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 567         ci.ndm_refcnt    = 0;
 568         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 569                 goto nla_put_failure;
 570
 571         if (nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id))
 572                 goto nla_put_failure;
 573
 574         return nlmsg_end(skb, nlh);
 575
 576 nla_put_failure:
 577         nlmsg_cancel(skb, nlh);
 578         return -EMSGSIZE;
 579 }
 580
 581 static inline size_t fdb_nlmsg_size(void)
 582 {
 583         return NLMSG_ALIGN(sizeof(struct ndmsg))
 584                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 585                 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
 586                 + nla_total_size(sizeof(struct nda_cacheinfo));
 587 }
 588
 589 static void fdb_notify(struct net_bridge *br,
 590                        const struct net_bridge_fdb_entry *fdb, int type)
 591 {
 592         struct net *net = dev_net(br->dev);
 593         struct sk_buff *skb;
 594         int err = -ENOBUFS;
 595
 596         skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
 597         if (skb == NULL)
 598                 goto errout;
 599
 600         err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
 601         if (err < 0) {
 602                 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
 603                 WARN_ON(err == -EMSGSIZE);
 604                 kfree_skb(skb);
 605                 goto errout;
 606         }
 607         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 608         return;
 609 errout:
 610         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 611 }
 612
 613 /* Dump information about entries, in response to GETNEIGH */
 614 int br_fdb_dump(struct sk_buff *skb,
 615                 struct netlink_callback *cb,
 616                 struct net_device *dev,
 617                 int idx)
 618 {
 619         struct net_bridge *br = netdev_priv(dev);
 620         int i;
 621
 622         if (!(dev->priv_flags & IFF_EBRIDGE))
 623                 goto out;
 624
 625         for (i = 0; i < BR_HASH_SIZE; i++) {
 626                 struct net_bridge_fdb_entry *f;
 627
 628                 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
 629                         if (idx < cb->args[0])
 630                                 goto skip;
 631
 632                         if (fdb_fill_info(skb, br, f,
 633                                           NETLINK_CB(cb->skb).portid,
 634                                           cb->nlh->nlmsg_seq,
 635                                           RTM_NEWNEIGH,
 636                                           NLM_F_MULTI) < 0)
 637                                 break;
 638 skip:
 639                         ++idx;
 640                 }
 641         }
 642
 643 out:
 644         return idx;
 645 }
 646
 647 /* Update (create or replace) forwarding database entry */
 648 static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
 649                          __u16 state, __u16 flags, __u16 vid)
 650 {
 651         struct net_bridge *br = source->br;
 652         struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
 653         struct net_bridge_fdb_entry *fdb;
 654         bool modified = false;
 655
 656         fdb = fdb_find(head, addr, vid);
 657         if (fdb == NULL) {
 658                 if (!(flags & NLM_F_CREATE))
 659                         return -ENOENT;
 660
 661                 fdb = fdb_create(head, source, addr, vid);
 662                 if (!fdb)
 663                         return -ENOMEM;
 664
 665                 modified = true;
 666         } else {
 667                 if (flags & NLM_F_EXCL)
 668                         return -EEXIST;
 669
 670                 if (fdb->dst != source) {
 671                         fdb->dst = source;
 672                         modified = true;
 673                 }
 674         }
 675
 676         if (fdb_to_nud(fdb) != state) {
 677                 if (state & NUD_PERMANENT)
 678                         fdb->is_local = fdb->is_static = 1;
 679                 else if (state & NUD_NOARP) {
 680                         fdb->is_local = 0;
 681                         fdb->is_static = 1;
 682                 } else
 683                         fdb->is_local = fdb->is_static = 0;
 684
 685                 modified = true;
 686         }
 687         fdb->added_by_user = 1;
 688
 689         fdb->used = jiffies;
 690         if (modified) {
 691                 fdb->updated = jiffies;
 692                 fdb_notify(br, fdb, RTM_NEWNEIGH);
 693         }
 694
 695         return 0;
 696 }
 697
 698 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p,
 699                const unsigned char *addr, u16 nlh_flags, u16 vid)
 700 {
 701         int err = 0;
 702
 703         if (ndm->ndm_flags & NTF_USE) {
 704                 rcu_read_lock();
 705                 br_fdb_update(p->br, p, addr, vid, true);
 706                 rcu_read_unlock();
 707         } else {
 708                 spin_lock_bh(&p->br->hash_lock);
 709                 err = fdb_add_entry(p, addr, ndm->ndm_state,
 710                                     nlh_flags, vid);
 711                 spin_unlock_bh(&p->br->hash_lock);
 712         }
 713
 714         return err;
 715 }
 716
 717 /* Add new permanent fdb entry with RTM_NEWNEIGH */
 718 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 719                struct net_device *dev,
 720                const unsigned char *addr, u16 nlh_flags)
 721 {
 722         struct net_bridge_port *p;
 723         int err = 0;
 724         struct net_port_vlans *pv;
 725         unsigned short vid = VLAN_N_VID;
 726
 727         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
 728                 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
 729                 return -EINVAL;
 730         }
 731
 732         if (tb[NDA_VLAN]) {
 733                 if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) {
 734                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n");
 735                         return -EINVAL;
 736                 }
 737
 738                 vid = nla_get_u16(tb[NDA_VLAN]);
 739
 740                 if (!vid || vid >= VLAN_VID_MASK) {
 741                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n",
 742                                 vid);
 743                         return -EINVAL;
 744                 }
 745         }
 746
 747         if (is_zero_ether_addr(addr)) {
 748                 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
 749                 return -EINVAL;
 750         }
 751
 752         p = br_port_get_rtnl(dev);
 753         if (p == NULL) {
 754                 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
 755                         dev->name);
 756                 return -EINVAL;
 757         }
 758
 759         pv = nbp_get_vlan_info(p);
 760         if (vid != VLAN_N_VID) {
 761                 if (!pv || !test_bit(vid, pv->vlan_bitmap)) {
 762                         pr_info("bridge: RTM_NEWNEIGH with unconfigured "
 763                                 "vlan %d on port %s\n", vid, dev->name);
 764                         return -EINVAL;
 765                 }
 766
 767                 /* VID was specified, so use it. */
 768                 err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
 769         } else {
 770                 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID)) {
 771                         err = __br_fdb_add(ndm, p, addr, nlh_flags, 0);
 772                         goto out;
 773                 }
 774
 775                 /* We have vlans configured on this port and user didn't
 776                  * specify a VLAN.  To be nice, add/update entry for every
 777                  * vlan on this port.
 778                  */
 779                 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
 780                         err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
 781                         if (err)
 782                                 goto out;
 783                 }
 784         }
 785
 786 out:
 787         return err;
 788 }
 789
 790 static int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, u16 vlan)
 791 {
 792         struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)];
 793         struct net_bridge_fdb_entry *fdb;
 794
 795         fdb = fdb_find(head, addr, vlan);
 796         if (!fdb)
 797                 return -ENOENT;
 798
 799         fdb_delete(br, fdb);
 800         return 0;
 801 }
 802
 803 static int __br_fdb_delete(struct net_bridge_port *p,
 804                            const unsigned char *addr, u16 vid)
 805 {
 806         int err;
 807
 808         spin_lock_bh(&p->br->hash_lock);
 809         err = fdb_delete_by_addr(p->br, addr, vid);
 810         spin_unlock_bh(&p->br->hash_lock);
 811
 812         return err;
 813 }
 814
 815 /* Remove neighbor entry with RTM_DELNEIGH */
 816 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 817                   struct net_device *dev,
 818                   const unsigned char *addr)
 819 {
 820         struct net_bridge_port *p;
 821         int err;
 822         struct net_port_vlans *pv;
 823         unsigned short vid = VLAN_N_VID;
 824
 825         if (tb[NDA_VLAN]) {
 826                 if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) {
 827                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n");
 828                         return -EINVAL;
 829                 }
 830
 831                 vid = nla_get_u16(tb[NDA_VLAN]);
 832
 833                 if (!vid || vid >= VLAN_VID_MASK) {
 834                         pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n",
 835                                 vid);
 836                         return -EINVAL;
 837                 }
 838         }
 839         p = br_port_get_rtnl(dev);
 840         if (p == NULL) {
 841                 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
 842                         dev->name);
 843                 return -EINVAL;
 844         }
 845
 846         pv = nbp_get_vlan_info(p);
 847         if (vid != VLAN_N_VID) {
 848                 if (!pv || !test_bit(vid, pv->vlan_bitmap)) {
 849                         pr_info("bridge: RTM_DELNEIGH with unconfigured "
 850                                 "vlan %d on port %s\n", vid, dev->name);
 851                         return -EINVAL;
 852                 }
 853
 854                 err = __br_fdb_delete(p, addr, vid);
 855         } else {
 856                 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID)) {
 857                         err = __br_fdb_delete(p, addr, 0);
 858                         goto out;
 859                 }
 860
 861                 /* We have vlans configured on this port and user didn't
 862                  * specify a VLAN.  To be nice, add/update entry for every
 863                  * vlan on this port.
 864                  */
 865                 err = -ENOENT;
 866                 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
 867                         err &= __br_fdb_delete(p, addr, vid);
 868                 }
 869         }
 870 out:
 871         return err;
 872 }