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