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