net/bridge/br_fdb.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      Forwarding database
   4  *      Linux ethernet bridge
   5  *
   6  *      Authors:
   7  *      Lennert Buytenhek               <buytenh@gnu.org>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/rculist.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/times.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/etherdevice.h>
  17 #include <linux/jhash.h>
  18 #include <linux/random.h>
  19 #include <linux/slab.h>
  20 #include <linux/atomic.h>
  21 #include <asm/unaligned.h>
  22 #include <linux/if_vlan.h>
  23 #include <net/switchdev.h>
  24 #include <trace/events/bridge.h>
  25 #include "br_private.h"
  26
  27 static const struct rhashtable_params br_fdb_rht_params = {
  28         .head_offset = offsetof(struct net_bridge_fdb_entry, rhnode),
  29         .key_offset = offsetof(struct net_bridge_fdb_entry, key),
  30         .key_len = sizeof(struct net_bridge_fdb_key),
  31         .automatic_shrinking = true,
  32 };
  33
  34 static struct kmem_cache *br_fdb_cache __read_mostly;
  35 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
  36                       const unsigned char *addr, u16 vid);
  37 static void fdb_notify(struct net_bridge *br,
  38                        const struct net_bridge_fdb_entry *, int, bool);
  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         return 0;
  50 }
  51
  52 void br_fdb_fini(void)
  53 {
  54         kmem_cache_destroy(br_fdb_cache);
  55 }
  56
  57 int br_fdb_hash_init(struct net_bridge *br)
  58 {
  59         return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params);
  60 }
  61
  62 void br_fdb_hash_fini(struct net_bridge *br)
  63 {
  64         rhashtable_destroy(&br->fdb_hash_tbl);
  65 }
  66
  67 /* if topology_changing then use forward_delay (default 15 sec)
  68  * otherwise keep longer (default 5 minutes)
  69  */
  70 static inline unsigned long hold_time(const struct net_bridge *br)
  71 {
  72         return br->topology_change ? br->forward_delay : br->ageing_time;
  73 }
  74
  75 static inline int has_expired(const struct net_bridge *br,
  76                                   const struct net_bridge_fdb_entry *fdb)
  77 {
  78         return !test_bit(BR_FDB_STATIC, &fdb->flags) &&
  79                !test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags) &&
  80                time_before_eq(fdb->updated + hold_time(br), jiffies);
  81 }
  82
  83 static void fdb_rcu_free(struct rcu_head *head)
  84 {
  85         struct net_bridge_fdb_entry *ent
  86                 = container_of(head, struct net_bridge_fdb_entry, rcu);
  87         kmem_cache_free(br_fdb_cache, ent);
  88 }
  89
  90 static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl,
  91                                                  const unsigned char *addr,
  92                                                  __u16 vid)
  93 {
  94         struct net_bridge_fdb_key key;
  95
  96         WARN_ON_ONCE(!rcu_read_lock_held());
  97
  98         key.vlan_id = vid;
  99         memcpy(key.addr.addr, addr, sizeof(key.addr.addr));
 100
 101         return rhashtable_lookup(tbl, &key, br_fdb_rht_params);
 102 }
 103
 104 /* requires bridge hash_lock */
 105 static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br,
 106                                                 const unsigned char *addr,
 107                                                 __u16 vid)
 108 {
 109         struct net_bridge_fdb_entry *fdb;
 110
 111         lockdep_assert_held_once(&br->hash_lock);
 112
 113         rcu_read_lock();
 114         fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
 115         rcu_read_unlock();
 116
 117         return fdb;
 118 }
 119
 120 struct net_device *br_fdb_find_port(const struct net_device *br_dev,
 121                                     const unsigned char *addr,
 122                                     __u16 vid)
 123 {
 124         struct net_bridge_fdb_entry *f;
 125         struct net_device *dev = NULL;
 126         struct net_bridge *br;
 127
 128         ASSERT_RTNL();
 129
 130         if (!netif_is_bridge_master(br_dev))
 131                 return NULL;
 132
 133         br = netdev_priv(br_dev);
 134         rcu_read_lock();
 135         f = br_fdb_find_rcu(br, addr, vid);
 136         if (f && f->dst)
 137                 dev = f->dst->dev;
 138         rcu_read_unlock();
 139
 140         return dev;
 141 }
 142 EXPORT_SYMBOL_GPL(br_fdb_find_port);
 143
 144 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
 145                                              const unsigned char *addr,
 146                                              __u16 vid)
 147 {
 148         return fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
 149 }
 150
 151 /* When a static FDB entry is added, the mac address from the entry is
 152  * added to the bridge private HW address list and all required ports
 153  * are then updated with the new information.
 154  * Called under RTNL.
 155  */
 156 static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr)
 157 {
 158         int err;
 159         struct net_bridge_port *p;
 160
 161         ASSERT_RTNL();
 162
 163         list_for_each_entry(p, &br->port_list, list) {
 164                 if (!br_promisc_port(p)) {
 165                         err = dev_uc_add(p->dev, addr);
 166                         if (err)
 167                                 goto undo;
 168                 }
 169         }
 170
 171         return;
 172 undo:
 173         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 174                 if (!br_promisc_port(p))
 175                         dev_uc_del(p->dev, addr);
 176         }
 177 }
 178
 179 /* When a static FDB entry is deleted, the HW address from that entry is
 180  * also removed from the bridge private HW address list and updates all
 181  * the ports with needed information.
 182  * Called under RTNL.
 183  */
 184 static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
 185 {
 186         struct net_bridge_port *p;
 187
 188         ASSERT_RTNL();
 189
 190         list_for_each_entry(p, &br->port_list, list) {
 191                 if (!br_promisc_port(p))
 192                         dev_uc_del(p->dev, addr);
 193         }
 194 }
 195
 196 static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f,
 197                        bool swdev_notify)
 198 {
 199         trace_fdb_delete(br, f);
 200
 201         if (test_bit(BR_FDB_STATIC, &f->flags))
 202                 fdb_del_hw_addr(br, f->key.addr.addr);
 203
 204         hlist_del_init_rcu(&f->fdb_node);
 205         rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode,
 206                                br_fdb_rht_params);
 207         fdb_notify(br, f, RTM_DELNEIGH, swdev_notify);
 208         call_rcu(&f->rcu, fdb_rcu_free);
 209 }
 210
 211 /* Delete a local entry if no other port had the same address. */
 212 static void fdb_delete_local(struct net_bridge *br,
 213                              const struct net_bridge_port *p,
 214                              struct net_bridge_fdb_entry *f)
 215 {
 216         const unsigned char *addr = f->key.addr.addr;
 217         struct net_bridge_vlan_group *vg;
 218         const struct net_bridge_vlan *v;
 219         struct net_bridge_port *op;
 220         u16 vid = f->key.vlan_id;
 221
 222         /* Maybe another port has same hw addr? */
 223         list_for_each_entry(op, &br->port_list, list) {
 224                 vg = nbp_vlan_group(op);
 225                 if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
 226                     (!vid || br_vlan_find(vg, vid))) {
 227                         f->dst = op;
 228                         clear_bit(BR_FDB_ADDED_BY_USER, &f->flags);
 229                         return;
 230                 }
 231         }
 232
 233         vg = br_vlan_group(br);
 234         v = br_vlan_find(vg, vid);
 235         /* Maybe bridge device has same hw addr? */
 236         if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
 237             (!vid || (v && br_vlan_should_use(v)))) {
 238                 f->dst = NULL;
 239                 clear_bit(BR_FDB_ADDED_BY_USER, &f->flags);
 240                 return;
 241         }
 242
 243         fdb_delete(br, f, true);
 244 }
 245
 246 void br_fdb_find_delete_local(struct net_bridge *br,
 247                               const struct net_bridge_port *p,
 248                               const unsigned char *addr, u16 vid)
 249 {
 250         struct net_bridge_fdb_entry *f;
 251
 252         spin_lock_bh(&br->hash_lock);
 253         f = br_fdb_find(br, addr, vid);
 254         if (f && test_bit(BR_FDB_LOCAL, &f->flags) &&
 255             !test_bit(BR_FDB_ADDED_BY_USER, &f->flags) && f->dst == p)
 256                 fdb_delete_local(br, p, f);
 257         spin_unlock_bh(&br->hash_lock);
 258 }
 259
 260 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
 261 {
 262         struct net_bridge_vlan_group *vg;
 263         struct net_bridge_fdb_entry *f;
 264         struct net_bridge *br = p->br;
 265         struct net_bridge_vlan *v;
 266
 267         spin_lock_bh(&br->hash_lock);
 268         vg = nbp_vlan_group(p);
 269         hlist_for_each_entry(f, &br->fdb_list, fdb_node) {
 270                 if (f->dst == p && test_bit(BR_FDB_LOCAL, &f->flags) &&
 271                     !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) {
 272                         /* delete old one */
 273                         fdb_delete_local(br, p, f);
 274
 275                         /* if this port has no vlan information
 276                          * configured, we can safely be done at
 277                          * this point.
 278                          */
 279                         if (!vg || !vg->num_vlans)
 280                                 goto insert;
 281                 }
 282         }
 283
 284 insert:
 285         /* insert new address,  may fail if invalid address or dup. */
 286         fdb_insert(br, p, newaddr, 0);
 287
 288         if (!vg || !vg->num_vlans)
 289                 goto done;
 290
 291         /* Now add entries for every VLAN configured on the port.
 292          * This function runs under RTNL so the bitmap will not change
 293          * from under us.
 294          */
 295         list_for_each_entry(v, &vg->vlan_list, vlist)
 296                 fdb_insert(br, p, newaddr, v->vid);
 297
 298 done:
 299         spin_unlock_bh(&br->hash_lock);
 300 }
 301
 302 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
 303 {
 304         struct net_bridge_vlan_group *vg;
 305         struct net_bridge_fdb_entry *f;
 306         struct net_bridge_vlan *v;
 307
 308         spin_lock_bh(&br->hash_lock);
 309
 310         /* If old entry was unassociated with any port, then delete it. */
 311         f = br_fdb_find(br, br->dev->dev_addr, 0);
 312         if (f && test_bit(BR_FDB_LOCAL, &f->flags) &&
 313             !f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags))
 314                 fdb_delete_local(br, NULL, f);
 315
 316         fdb_insert(br, NULL, newaddr, 0);
 317         vg = br_vlan_group(br);
 318         if (!vg || !vg->num_vlans)
 319                 goto out;
 320         /* Now remove and add entries for every VLAN configured on the
 321          * bridge.  This function runs under RTNL so the bitmap will not
 322          * change from under us.
 323          */
 324         list_for_each_entry(v, &vg->vlan_list, vlist) {
 325                 if (!br_vlan_should_use(v))
 326                         continue;
 327                 f = br_fdb_find(br, br->dev->dev_addr, v->vid);
 328                 if (f && test_bit(BR_FDB_LOCAL, &f->flags) &&
 329                     !f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags))
 330                         fdb_delete_local(br, NULL, f);
 331                 fdb_insert(br, NULL, newaddr, v->vid);
 332         }
 333 out:
 334         spin_unlock_bh(&br->hash_lock);
 335 }
 336
 337 void br_fdb_cleanup(struct work_struct *work)
 338 {
 339         struct net_bridge *br = container_of(work, struct net_bridge,
 340                                              gc_work.work);
 341         struct net_bridge_fdb_entry *f = NULL;
 342         unsigned long delay = hold_time(br);
 343         unsigned long work_delay = delay;
 344         unsigned long now = jiffies;
 345
 346         /* this part is tricky, in order to avoid blocking learning and
 347          * consequently forwarding, we rely on rcu to delete objects with
 348          * delayed freeing allowing us to continue traversing
 349          */
 350         rcu_read_lock();
 351         hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
 352                 unsigned long this_timer = f->updated + delay;
 353
 354                 if (test_bit(BR_FDB_STATIC, &f->flags) ||
 355                     test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags)) {
 356                         if (test_bit(BR_FDB_NOTIFY, &f->flags)) {
 357                                 if (time_after(this_timer, now))
 358                                         work_delay = min(work_delay,
 359                                                          this_timer - now);
 360                                 else if (!test_and_set_bit(BR_FDB_NOTIFY_INACTIVE,
 361                                                            &f->flags))
 362                                         fdb_notify(br, f, RTM_NEWNEIGH, false);
 363                         }
 364                         continue;
 365                 }
 366
 367                 if (time_after(this_timer, now)) {
 368                         work_delay = min(work_delay, this_timer - now);
 369                 } else {
 370                         spin_lock_bh(&br->hash_lock);
 371                         if (!hlist_unhashed(&f->fdb_node))
 372                                 fdb_delete(br, f, true);
 373                         spin_unlock_bh(&br->hash_lock);
 374                 }
 375         }
 376         rcu_read_unlock();
 377
 378         /* Cleanup minimum 10 milliseconds apart */
 379         work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10));
 380         mod_delayed_work(system_long_wq, &br->gc_work, work_delay);
 381 }
 382
 383 /* Completely flush all dynamic entries in forwarding database.*/
 384 void br_fdb_flush(struct net_bridge *br)
 385 {
 386         struct net_bridge_fdb_entry *f;
 387         struct hlist_node *tmp;
 388
 389         spin_lock_bh(&br->hash_lock);
 390         hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
 391                 if (!test_bit(BR_FDB_STATIC, &f->flags))
 392                         fdb_delete(br, f, true);
 393         }
 394         spin_unlock_bh(&br->hash_lock);
 395 }
 396
 397 /* Flush all entries referring to a specific port.
 398  * if do_all is set also flush static entries
 399  * if vid is set delete all entries that match the vlan_id
 400  */
 401 void br_fdb_delete_by_port(struct net_bridge *br,
 402                            const struct net_bridge_port *p,
 403                            u16 vid,
 404                            int do_all)
 405 {
 406         struct net_bridge_fdb_entry *f;
 407         struct hlist_node *tmp;
 408
 409         spin_lock_bh(&br->hash_lock);
 410         hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
 411                 if (f->dst != p)
 412                         continue;
 413
 414                 if (!do_all)
 415                         if (test_bit(BR_FDB_STATIC, &f->flags) ||
 416                             (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags) &&
 417                              !test_bit(BR_FDB_OFFLOADED, &f->flags)) ||
 418                             (vid && f->key.vlan_id != vid))
 419                                 continue;
 420
 421                 if (test_bit(BR_FDB_LOCAL, &f->flags))
 422                         fdb_delete_local(br, p, f);
 423                 else
 424                         fdb_delete(br, f, true);
 425         }
 426         spin_unlock_bh(&br->hash_lock);
 427 }
 428
 429 #if IS_ENABLED(CONFIG_ATM_LANE)
 430 /* Interface used by ATM LANE hook to test
 431  * if an addr is on some other bridge port */
 432 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
 433 {
 434         struct net_bridge_fdb_entry *fdb;
 435         struct net_bridge_port *port;
 436         int ret;
 437
 438         rcu_read_lock();
 439         port = br_port_get_rcu(dev);
 440         if (!port)
 441                 ret = 0;
 442         else {
 443                 fdb = br_fdb_find_rcu(port->br, addr, 0);
 444                 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
 445                         fdb->dst->state == BR_STATE_FORWARDING;
 446         }
 447         rcu_read_unlock();
 448
 449         return ret;
 450 }
 451 #endif /* CONFIG_ATM_LANE */
 452
 453 /*
 454  * Fill buffer with forwarding table records in
 455  * the API format.
 456  */
 457 int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 458                    unsigned long maxnum, unsigned long skip)
 459 {
 460         struct net_bridge_fdb_entry *f;
 461         struct __fdb_entry *fe = buf;
 462         int num = 0;
 463
 464         memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
 465
 466         rcu_read_lock();
 467         hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
 468                 if (num >= maxnum)
 469                         break;
 470
 471                 if (has_expired(br, f))
 472                         continue;
 473
 474                 /* ignore pseudo entry for local MAC address */
 475                 if (!f->dst)
 476                         continue;
 477
 478                 if (skip) {
 479                         --skip;
 480                         continue;
 481                 }
 482
 483                 /* convert from internal format to API */
 484                 memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN);
 485
 486                 /* due to ABI compat need to split into hi/lo */
 487                 fe->port_no = f->dst->port_no;
 488                 fe->port_hi = f->dst->port_no >> 8;
 489
 490                 fe->is_local = test_bit(BR_FDB_LOCAL, &f->flags);
 491                 if (!test_bit(BR_FDB_STATIC, &f->flags))
 492                         fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
 493                 ++fe;
 494                 ++num;
 495         }
 496         rcu_read_unlock();
 497
 498         return num;
 499 }
 500
 501 static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
 502                                                struct net_bridge_port *source,
 503                                                const unsigned char *addr,
 504                                                __u16 vid,
 505                                                unsigned long flags)
 506 {
 507         struct net_bridge_fdb_entry *fdb;
 508
 509         fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
 510         if (fdb) {
 511                 memcpy(fdb->key.addr.addr, addr, ETH_ALEN);
 512                 fdb->dst = source;
 513                 fdb->key.vlan_id = vid;
 514                 fdb->flags = flags;
 515                 fdb->updated = fdb->used = jiffies;
 516                 if (rhashtable_lookup_insert_fast(&br->fdb_hash_tbl,
 517                                                   &fdb->rhnode,
 518                                                   br_fdb_rht_params)) {
 519                         kmem_cache_free(br_fdb_cache, fdb);
 520                         fdb = NULL;
 521                 } else {
 522                         hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list);
 523                 }
 524         }
 525         return fdb;
 526 }
 527
 528 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 529                   const unsigned char *addr, u16 vid)
 530 {
 531         struct net_bridge_fdb_entry *fdb;
 532
 533         if (!is_valid_ether_addr(addr))
 534                 return -EINVAL;
 535
 536         fdb = br_fdb_find(br, addr, vid);
 537         if (fdb) {
 538                 /* it is okay to have multiple ports with same
 539                  * address, just use the first one.
 540                  */
 541                 if (test_bit(BR_FDB_LOCAL, &fdb->flags))
 542                         return 0;
 543                 br_warn(br, "adding interface %s with same address as a received packet (addr:%pM, vlan:%u)\n",
 544                        source ? source->dev->name : br->dev->name, addr, vid);
 545                 fdb_delete(br, fdb, true);
 546         }
 547
 548         fdb = fdb_create(br, source, addr, vid,
 549                          BIT(BR_FDB_LOCAL) | BIT(BR_FDB_STATIC));
 550         if (!fdb)
 551                 return -ENOMEM;
 552
 553         fdb_add_hw_addr(br, addr);
 554         fdb_notify(br, fdb, RTM_NEWNEIGH, true);
 555         return 0;
 556 }
 557
 558 /* Add entry for local address of interface */
 559 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 560                   const unsigned char *addr, u16 vid)
 561 {
 562         int ret;
 563
 564         spin_lock_bh(&br->hash_lock);
 565         ret = fdb_insert(br, source, addr, vid);
 566         spin_unlock_bh(&br->hash_lock);
 567         return ret;
 568 }
 569
 570 /* returns true if the fdb was modified */
 571 static bool __fdb_mark_active(struct net_bridge_fdb_entry *fdb)
 572 {
 573         return !!(test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags) &&
 574                   test_and_clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags));
 575 }
 576
 577 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 578                    const unsigned char *addr, u16 vid, unsigned long flags)
 579 {
 580         struct net_bridge_fdb_entry *fdb;
 581
 582         /* some users want to always flood. */
 583         if (hold_time(br) == 0)
 584                 return;
 585
 586         fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
 587         if (likely(fdb)) {
 588                 /* attempt to update an entry for a local interface */
 589                 if (unlikely(test_bit(BR_FDB_LOCAL, &fdb->flags))) {
 590                         if (net_ratelimit())
 591                                 br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n",
 592                                         source->dev->name, addr, vid);
 593                 } else {
 594                         unsigned long now = jiffies;
 595                         bool fdb_modified = false;
 596
 597                         if (now != fdb->updated) {
 598                                 fdb->updated = now;
 599                                 fdb_modified = __fdb_mark_active(fdb);
 600                         }
 601
 602                         /* fastpath: update of existing entry */
 603                         if (unlikely(source != fdb->dst &&
 604                                      !test_bit(BR_FDB_STICKY, &fdb->flags))) {
 605                                 fdb->dst = source;
 606                                 fdb_modified = true;
 607                                 /* Take over HW learned entry */
 608                                 if (unlikely(test_bit(BR_FDB_ADDED_BY_EXT_LEARN,
 609                                                       &fdb->flags)))
 610                                         clear_bit(BR_FDB_ADDED_BY_EXT_LEARN,
 611                                                   &fdb->flags);
 612                         }
 613
 614                         if (unlikely(test_bit(BR_FDB_ADDED_BY_USER, &flags)))
 615                                 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
 616                         if (unlikely(fdb_modified)) {
 617                                 trace_br_fdb_update(br, source, addr, vid, flags);
 618                                 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
 619                         }
 620                 }
 621         } else {
 622                 spin_lock(&br->hash_lock);
 623                 fdb = fdb_create(br, source, addr, vid, flags);
 624                 if (fdb) {
 625                         trace_br_fdb_update(br, source, addr, vid, flags);
 626                         fdb_notify(br, fdb, RTM_NEWNEIGH, true);
 627                 }
 628                 /* else  we lose race and someone else inserts
 629                  * it first, don't bother updating
 630                  */
 631                 spin_unlock(&br->hash_lock);
 632         }
 633 }
 634
 635 static int fdb_to_nud(const struct net_bridge *br,
 636                       const struct net_bridge_fdb_entry *fdb)
 637 {
 638         if (test_bit(BR_FDB_LOCAL, &fdb->flags))
 639                 return NUD_PERMANENT;
 640         else if (test_bit(BR_FDB_STATIC, &fdb->flags))
 641                 return NUD_NOARP;
 642         else if (has_expired(br, fdb))
 643                 return NUD_STALE;
 644         else
 645                 return NUD_REACHABLE;
 646 }
 647
 648 static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
 649                          const struct net_bridge_fdb_entry *fdb,
 650                          u32 portid, u32 seq, int type, unsigned int flags)
 651 {
 652         unsigned long now = jiffies;
 653         struct nda_cacheinfo ci;
 654         struct nlmsghdr *nlh;
 655         struct ndmsg *ndm;
 656
 657         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 658         if (nlh == NULL)
 659                 return -EMSGSIZE;
 660
 661         ndm = nlmsg_data(nlh);
 662         ndm->ndm_family  = AF_BRIDGE;
 663         ndm->ndm_pad1    = 0;
 664         ndm->ndm_pad2    = 0;
 665         ndm->ndm_flags   = 0;
 666         ndm->ndm_type    = 0;
 667         ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
 668         ndm->ndm_state   = fdb_to_nud(br, fdb);
 669
 670         if (test_bit(BR_FDB_OFFLOADED, &fdb->flags))
 671                 ndm->ndm_flags |= NTF_OFFLOADED;
 672         if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
 673                 ndm->ndm_flags |= NTF_EXT_LEARNED;
 674         if (test_bit(BR_FDB_STICKY, &fdb->flags))
 675                 ndm->ndm_flags |= NTF_STICKY;
 676
 677         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.addr))
 678                 goto nla_put_failure;
 679         if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
 680                 goto nla_put_failure;
 681         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 682         ci.ndm_confirmed = 0;
 683         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 684         ci.ndm_refcnt    = 0;
 685         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 686                 goto nla_put_failure;
 687
 688         if (fdb->key.vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16),
 689                                         &fdb->key.vlan_id))
 690                 goto nla_put_failure;
 691
 692         if (test_bit(BR_FDB_NOTIFY, &fdb->flags)) {
 693                 struct nlattr *nest = nla_nest_start(skb, NDA_FDB_EXT_ATTRS);
 694                 u8 notify_bits = FDB_NOTIFY_BIT;
 695
 696                 if (!nest)
 697                         goto nla_put_failure;
 698                 if (test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags))
 699                         notify_bits |= FDB_NOTIFY_INACTIVE_BIT;
 700
 701                 if (nla_put_u8(skb, NFEA_ACTIVITY_NOTIFY, notify_bits)) {
 702                         nla_nest_cancel(skb, nest);
 703                         goto nla_put_failure;
 704                 }
 705
 706                 nla_nest_end(skb, nest);
 707         }
 708
 709         nlmsg_end(skb, nlh);
 710         return 0;
 711
 712 nla_put_failure:
 713         nlmsg_cancel(skb, nlh);
 714         return -EMSGSIZE;
 715 }
 716
 717 static inline size_t fdb_nlmsg_size(void)
 718 {
 719         return NLMSG_ALIGN(sizeof(struct ndmsg))
 720                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 721                 + nla_total_size(sizeof(u32)) /* NDA_MASTER */
 722                 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
 723                 + nla_total_size(sizeof(struct nda_cacheinfo))
 724                 + nla_total_size(0) /* NDA_FDB_EXT_ATTRS */
 725                 + nla_total_size(sizeof(u8)); /* NFEA_ACTIVITY_NOTIFY */
 726 }
 727
 728 static void fdb_notify(struct net_bridge *br,
 729                        const struct net_bridge_fdb_entry *fdb, int type,
 730                        bool swdev_notify)
 731 {
 732         struct net *net = dev_net(br->dev);
 733         struct sk_buff *skb;
 734         int err = -ENOBUFS;
 735
 736         if (swdev_notify)
 737                 br_switchdev_fdb_notify(fdb, type);
 738
 739         skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
 740         if (skb == NULL)
 741                 goto errout;
 742
 743         err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
 744         if (err < 0) {
 745                 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
 746                 WARN_ON(err == -EMSGSIZE);
 747                 kfree_skb(skb);
 748                 goto errout;
 749         }
 750         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 751         return;
 752 errout:
 753         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 754 }
 755
 756 /* Dump information about entries, in response to GETNEIGH */
 757 int br_fdb_dump(struct sk_buff *skb,
 758                 struct netlink_callback *cb,
 759                 struct net_device *dev,
 760                 struct net_device *filter_dev,
 761                 int *idx)
 762 {
 763         struct net_bridge *br = netdev_priv(dev);
 764         struct net_bridge_fdb_entry *f;
 765         int err = 0;
 766
 767         if (!(dev->priv_flags & IFF_EBRIDGE))
 768                 return err;
 769
 770         if (!filter_dev) {
 771                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
 772                 if (err < 0)
 773                         return err;
 774         }
 775
 776         rcu_read_lock();
 777         hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
 778                 if (*idx < cb->args[2])
 779                         goto skip;
 780                 if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) {
 781                         if (filter_dev != dev)
 782                                 goto skip;
 783                         /* !f->dst is a special case for bridge
 784                          * It means the MAC belongs to the bridge
 785                          * Therefore need a little more filtering
 786                          * we only want to dump the !f->dst case
 787                          */
 788                         if (f->dst)
 789                                 goto skip;
 790                 }
 791                 if (!filter_dev && f->dst)
 792                         goto skip;
 793
 794                 err = fdb_fill_info(skb, br, f,
 795                                     NETLINK_CB(cb->skb).portid,
 796                                     cb->nlh->nlmsg_seq,
 797                                     RTM_NEWNEIGH,
 798                                     NLM_F_MULTI);
 799                 if (err < 0)
 800                         break;
 801 skip:
 802                 *idx += 1;
 803         }
 804         rcu_read_unlock();
 805
 806         return err;
 807 }
 808
 809 int br_fdb_get(struct sk_buff *skb,
 810                struct nlattr *tb[],
 811                struct net_device *dev,
 812                const unsigned char *addr,
 813                u16 vid, u32 portid, u32 seq,
 814                struct netlink_ext_ack *extack)
 815 {
 816         struct net_bridge *br = netdev_priv(dev);
 817         struct net_bridge_fdb_entry *f;
 818         int err = 0;
 819
 820         rcu_read_lock();
 821         f = br_fdb_find_rcu(br, addr, vid);
 822         if (!f) {
 823                 NL_SET_ERR_MSG(extack, "Fdb entry not found");
 824                 err = -ENOENT;
 825                 goto errout;
 826         }
 827
 828         err = fdb_fill_info(skb, br, f, portid, seq,
 829                             RTM_NEWNEIGH, 0);
 830 errout:
 831         rcu_read_unlock();
 832         return err;
 833 }
 834
 835 /* returns true if the fdb is modified */
 836 static bool fdb_handle_notify(struct net_bridge_fdb_entry *fdb, u8 notify)
 837 {
 838         bool modified = false;
 839
 840         /* allow to mark an entry as inactive, usually done on creation */
 841         if ((notify & FDB_NOTIFY_INACTIVE_BIT) &&
 842             !test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags))
 843                 modified = true;
 844
 845         if ((notify & FDB_NOTIFY_BIT) &&
 846             !test_and_set_bit(BR_FDB_NOTIFY, &fdb->flags)) {
 847                 /* enabled activity tracking */
 848                 modified = true;
 849         } else if (!(notify & FDB_NOTIFY_BIT) &&
 850                    test_and_clear_bit(BR_FDB_NOTIFY, &fdb->flags)) {
 851                 /* disabled activity tracking, clear notify state */
 852                 clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags);
 853                 modified = true;
 854         }
 855
 856         return modified;
 857 }
 858
 859 /* Update (create or replace) forwarding database entry */
 860 static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
 861                          const u8 *addr, struct ndmsg *ndm, u16 flags, u16 vid,
 862                          struct nlattr *nfea_tb[])
 863 {
 864         bool is_sticky = !!(ndm->ndm_flags & NTF_STICKY);
 865         bool refresh = !nfea_tb[NFEA_DONT_REFRESH];
 866         struct net_bridge_fdb_entry *fdb;
 867         u16 state = ndm->ndm_state;
 868         bool modified = false;
 869         u8 notify = 0;
 870
 871         /* If the port cannot learn allow only local and static entries */
 872         if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
 873             !(source->state == BR_STATE_LEARNING ||
 874               source->state == BR_STATE_FORWARDING))
 875                 return -EPERM;
 876
 877         if (!source && !(state & NUD_PERMANENT)) {
 878                 pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n",
 879                         br->dev->name);
 880                 return -EINVAL;
 881         }
 882
 883         if (is_sticky && (state & NUD_PERMANENT))
 884                 return -EINVAL;
 885
 886         if (nfea_tb[NFEA_ACTIVITY_NOTIFY]) {
 887                 notify = nla_get_u8(nfea_tb[NFEA_ACTIVITY_NOTIFY]);
 888                 if ((notify & ~BR_FDB_NOTIFY_SETTABLE_BITS) ||
 889                     (notify & BR_FDB_NOTIFY_SETTABLE_BITS) == FDB_NOTIFY_INACTIVE_BIT)
 890                         return -EINVAL;
 891         }
 892
 893         fdb = br_fdb_find(br, addr, vid);
 894         if (fdb == NULL) {
 895                 if (!(flags & NLM_F_CREATE))
 896                         return -ENOENT;
 897
 898                 fdb = fdb_create(br, source, addr, vid, 0);
 899                 if (!fdb)
 900                         return -ENOMEM;
 901
 902                 modified = true;
 903         } else {
 904                 if (flags & NLM_F_EXCL)
 905                         return -EEXIST;
 906
 907                 if (fdb->dst != source) {
 908                         fdb->dst = source;
 909                         modified = true;
 910                 }
 911         }
 912
 913         if (fdb_to_nud(br, fdb) != state) {
 914                 if (state & NUD_PERMANENT) {
 915                         set_bit(BR_FDB_LOCAL, &fdb->flags);
 916                         if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags))
 917                                 fdb_add_hw_addr(br, addr);
 918                 } else if (state & NUD_NOARP) {
 919                         clear_bit(BR_FDB_LOCAL, &fdb->flags);
 920                         if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags))
 921                                 fdb_add_hw_addr(br, addr);
 922                 } else {
 923                         clear_bit(BR_FDB_LOCAL, &fdb->flags);
 924                         if (test_and_clear_bit(BR_FDB_STATIC, &fdb->flags))
 925                                 fdb_del_hw_addr(br, addr);
 926                 }
 927
 928                 modified = true;
 929         }
 930
 931         if (is_sticky != test_bit(BR_FDB_STICKY, &fdb->flags)) {
 932                 change_bit(BR_FDB_STICKY, &fdb->flags);
 933                 modified = true;
 934         }
 935
 936         if (fdb_handle_notify(fdb, notify))
 937                 modified = true;
 938
 939         set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
 940
 941         fdb->used = jiffies;
 942         if (modified) {
 943                 if (refresh)
 944                         fdb->updated = jiffies;
 945                 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
 946         }
 947
 948         return 0;
 949 }
 950
 951 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
 952                         struct net_bridge_port *p, const unsigned char *addr,
 953                         u16 nlh_flags, u16 vid, struct nlattr *nfea_tb[])
 954 {
 955         int err = 0;
 956
 957         if (ndm->ndm_flags & NTF_USE) {
 958                 if (!p) {
 959                         pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n",
 960                                 br->dev->name);
 961                         return -EINVAL;
 962                 }
 963                 if (!nbp_state_should_learn(p))
 964                         return 0;
 965
 966                 local_bh_disable();
 967                 rcu_read_lock();
 968                 br_fdb_update(br, p, addr, vid, BIT(BR_FDB_ADDED_BY_USER));
 969                 rcu_read_unlock();
 970                 local_bh_enable();
 971         } else if (ndm->ndm_flags & NTF_EXT_LEARNED) {
 972                 err = br_fdb_external_learn_add(br, p, addr, vid, true);
 973         } else {
 974                 spin_lock_bh(&br->hash_lock);
 975                 err = fdb_add_entry(br, p, addr, ndm, nlh_flags, vid, nfea_tb);
 976                 spin_unlock_bh(&br->hash_lock);
 977         }
 978
 979         return err;
 980 }
 981
 982 static const struct nla_policy br_nda_fdb_pol[NFEA_MAX + 1] = {
 983         [NFEA_ACTIVITY_NOTIFY]  = { .type = NLA_U8 },
 984         [NFEA_DONT_REFRESH]     = { .type = NLA_FLAG },
 985 };
 986
 987 /* Add new permanent fdb entry with RTM_NEWNEIGH */
 988 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 989                struct net_device *dev,
 990                const unsigned char *addr, u16 vid, u16 nlh_flags,
 991                struct netlink_ext_ack *extack)
 992 {
 993         struct nlattr *nfea_tb[NFEA_MAX + 1], *attr;
 994         struct net_bridge_vlan_group *vg;
 995         struct net_bridge_port *p = NULL;
 996         struct net_bridge_vlan *v;
 997         struct net_bridge *br = NULL;
 998         int err = 0;
 999
1000         trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags);
1001
1002         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
1003                 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
1004                 return -EINVAL;
1005         }
1006
1007         if (is_zero_ether_addr(addr)) {
1008                 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
1009                 return -EINVAL;
1010         }
1011
1012         if (dev->priv_flags & IFF_EBRIDGE) {
1013                 br = netdev_priv(dev);
1014                 vg = br_vlan_group(br);
1015         } else {
1016                 p = br_port_get_rtnl(dev);
1017                 if (!p) {
1018                         pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
1019                                 dev->name);
1020                         return -EINVAL;
1021                 }
1022                 br = p->br;
1023                 vg = nbp_vlan_group(p);
1024         }
1025
1026         if (tb[NDA_FDB_EXT_ATTRS]) {
1027                 attr = tb[NDA_FDB_EXT_ATTRS];
1028                 err = nla_parse_nested(nfea_tb, NFEA_MAX, attr,
1029                                        br_nda_fdb_pol, extack);
1030                 if (err)
1031                         return err;
1032         } else {
1033                 memset(nfea_tb, 0, sizeof(struct nlattr *) * (NFEA_MAX + 1));
1034         }
1035
1036         if (vid) {
1037                 v = br_vlan_find(vg, vid);
1038                 if (!v || !br_vlan_should_use(v)) {
1039                         pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1040                         return -EINVAL;
1041                 }
1042
1043                 /* VID was specified, so use it. */
1044                 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid, nfea_tb);
1045         } else {
1046                 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0, nfea_tb);
1047                 if (err || !vg || !vg->num_vlans)
1048                         goto out;
1049
1050                 /* We have vlans configured on this port and user didn't
1051                  * specify a VLAN.  To be nice, add/update entry for every
1052                  * vlan on this port.
1053                  */
1054                 list_for_each_entry(v, &vg->vlan_list, vlist) {
1055                         if (!br_vlan_should_use(v))
1056                                 continue;
1057                         err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid,
1058                                            nfea_tb);
1059                         if (err)
1060                                 goto out;
1061                 }
1062         }
1063
1064 out:
1065         return err;
1066 }
1067
1068 static int fdb_delete_by_addr_and_port(struct net_bridge *br,
1069                                        const struct net_bridge_port *p,
1070                                        const u8 *addr, u16 vlan)
1071 {
1072         struct net_bridge_fdb_entry *fdb;
1073
1074         fdb = br_fdb_find(br, addr, vlan);
1075         if (!fdb || fdb->dst != p)
1076                 return -ENOENT;
1077
1078         fdb_delete(br, fdb, true);
1079
1080         return 0;
1081 }
1082
1083 static int __br_fdb_delete(struct net_bridge *br,
1084                            const struct net_bridge_port *p,
1085                            const unsigned char *addr, u16 vid)
1086 {
1087         int err;
1088
1089         spin_lock_bh(&br->hash_lock);
1090         err = fdb_delete_by_addr_and_port(br, p, addr, vid);
1091         spin_unlock_bh(&br->hash_lock);
1092
1093         return err;
1094 }
1095
1096 /* Remove neighbor entry with RTM_DELNEIGH */
1097 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1098                   struct net_device *dev,
1099                   const unsigned char *addr, u16 vid)
1100 {
1101         struct net_bridge_vlan_group *vg;
1102         struct net_bridge_port *p = NULL;
1103         struct net_bridge_vlan *v;
1104         struct net_bridge *br;
1105         int err;
1106
1107         if (dev->priv_flags & IFF_EBRIDGE) {
1108                 br = netdev_priv(dev);
1109                 vg = br_vlan_group(br);
1110         } else {
1111                 p = br_port_get_rtnl(dev);
1112                 if (!p) {
1113                         pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
1114                                 dev->name);
1115                         return -EINVAL;
1116                 }
1117                 vg = nbp_vlan_group(p);
1118                 br = p->br;
1119         }
1120
1121         if (vid) {
1122                 v = br_vlan_find(vg, vid);
1123                 if (!v) {
1124                         pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1125                         return -EINVAL;
1126                 }
1127
1128                 err = __br_fdb_delete(br, p, addr, vid);
1129         } else {
1130                 err = -ENOENT;
1131                 err &= __br_fdb_delete(br, p, addr, 0);
1132                 if (!vg || !vg->num_vlans)
1133                         return err;
1134
1135                 list_for_each_entry(v, &vg->vlan_list, vlist) {
1136                         if (!br_vlan_should_use(v))
1137                                 continue;
1138                         err &= __br_fdb_delete(br, p, addr, v->vid);
1139                 }
1140         }
1141
1142         return err;
1143 }
1144
1145 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
1146 {
1147         struct net_bridge_fdb_entry *f, *tmp;
1148         int err = 0;
1149
1150         ASSERT_RTNL();
1151
1152         /* the key here is that static entries change only under rtnl */
1153         rcu_read_lock();
1154         hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1155                 /* We only care for static entries */
1156                 if (!test_bit(BR_FDB_STATIC, &f->flags))
1157                         continue;
1158                 err = dev_uc_add(p->dev, f->key.addr.addr);
1159                 if (err)
1160                         goto rollback;
1161         }
1162 done:
1163         rcu_read_unlock();
1164
1165         return err;
1166
1167 rollback:
1168         hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) {
1169                 /* We only care for static entries */
1170                 if (!test_bit(BR_FDB_STATIC, &tmp->flags))
1171                         continue;
1172                 if (tmp == f)
1173                         break;
1174                 dev_uc_del(p->dev, tmp->key.addr.addr);
1175         }
1176
1177         goto done;
1178 }
1179
1180 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
1181 {
1182         struct net_bridge_fdb_entry *f;
1183
1184         ASSERT_RTNL();
1185
1186         rcu_read_lock();
1187         hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1188                 /* We only care for static entries */
1189                 if (!test_bit(BR_FDB_STATIC, &f->flags))
1190                         continue;
1191
1192                 dev_uc_del(p->dev, f->key.addr.addr);
1193         }
1194         rcu_read_unlock();
1195 }
1196
1197 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
1198                               const unsigned char *addr, u16 vid,
1199                               bool swdev_notify)
1200 {
1201         struct net_bridge_fdb_entry *fdb;
1202         bool modified = false;
1203         int err = 0;
1204
1205         trace_br_fdb_external_learn_add(br, p, addr, vid);
1206
1207         spin_lock_bh(&br->hash_lock);
1208
1209         fdb = br_fdb_find(br, addr, vid);
1210         if (!fdb) {
1211                 unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN);
1212
1213                 if (swdev_notify)
1214                         flags |= BIT(BR_FDB_ADDED_BY_USER);
1215                 fdb = fdb_create(br, p, addr, vid, flags);
1216                 if (!fdb) {
1217                         err = -ENOMEM;
1218                         goto err_unlock;
1219                 }
1220                 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1221         } else {
1222                 fdb->updated = jiffies;
1223
1224                 if (fdb->dst != p) {
1225                         fdb->dst = p;
1226                         modified = true;
1227                 }
1228
1229                 if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) {
1230                         /* Refresh entry */
1231                         fdb->used = jiffies;
1232                 } else if (!test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags)) {
1233                         /* Take over SW learned entry */
1234                         set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags);
1235                         modified = true;
1236                 }
1237
1238                 if (swdev_notify)
1239                         set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
1240
1241                 if (modified)
1242                         fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1243         }
1244
1245 err_unlock:
1246         spin_unlock_bh(&br->hash_lock);
1247
1248         return err;
1249 }
1250
1251 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
1252                               const unsigned char *addr, u16 vid,
1253                               bool swdev_notify)
1254 {
1255         struct net_bridge_fdb_entry *fdb;
1256         int err = 0;
1257
1258         spin_lock_bh(&br->hash_lock);
1259
1260         fdb = br_fdb_find(br, addr, vid);
1261         if (fdb && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
1262                 fdb_delete(br, fdb, swdev_notify);
1263         else
1264                 err = -ENOENT;
1265
1266         spin_unlock_bh(&br->hash_lock);
1267
1268         return err;
1269 }
1270
1271 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
1272                           const unsigned char *addr, u16 vid, bool offloaded)
1273 {
1274         struct net_bridge_fdb_entry *fdb;
1275
1276         spin_lock_bh(&br->hash_lock);
1277
1278         fdb = br_fdb_find(br, addr, vid);
1279         if (fdb && offloaded != test_bit(BR_FDB_OFFLOADED, &fdb->flags))
1280                 change_bit(BR_FDB_OFFLOADED, &fdb->flags);
1281
1282         spin_unlock_bh(&br->hash_lock);
1283 }
1284
1285 void br_fdb_clear_offload(const struct net_device *dev, u16 vid)
1286 {
1287         struct net_bridge_fdb_entry *f;
1288         struct net_bridge_port *p;
1289
1290         ASSERT_RTNL();
1291
1292         p = br_port_get_rtnl(dev);
1293         if (!p)
1294                 return;
1295
1296         spin_lock_bh(&p->br->hash_lock);
1297         hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) {
1298                 if (f->dst == p && f->key.vlan_id == vid)
1299                         clear_bit(BR_FDB_OFFLOADED, &f->flags);
1300         }
1301         spin_unlock_bh(&p->br->hash_lock);
1302 }
1303 EXPORT_SYMBOL_GPL(br_fdb_clear_offload);