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                                 br_switchdev_fdb_notify(fdb, RTM_DELNEIGH);
 606                                 fdb->dst = source;
 607                                 fdb_modified = true;
 608                                 /* Take over HW learned entry */
 609                                 if (unlikely(test_bit(BR_FDB_ADDED_BY_EXT_LEARN,
 610                                                       &fdb->flags)))
 611                                         clear_bit(BR_FDB_ADDED_BY_EXT_LEARN,
 612                                                   &fdb->flags);
 613                         }
 614
 615                         if (unlikely(test_bit(BR_FDB_ADDED_BY_USER, &flags)))
 616                                 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
 617                         if (unlikely(fdb_modified)) {
 618                                 trace_br_fdb_update(br, source, addr, vid, flags);
 619                                 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
 620                         }
 621                 }
 622         } else {
 623                 spin_lock(&br->hash_lock);
 624                 fdb = fdb_create(br, source, addr, vid, flags);
 625                 if (fdb) {
 626                         trace_br_fdb_update(br, source, addr, vid, flags);
 627                         fdb_notify(br, fdb, RTM_NEWNEIGH, true);
 628                 }
 629                 /* else  we lose race and someone else inserts
 630                  * it first, don't bother updating
 631                  */
 632                 spin_unlock(&br->hash_lock);
 633         }
 634 }
 635
 636 static int fdb_to_nud(const struct net_bridge *br,
 637                       const struct net_bridge_fdb_entry *fdb)
 638 {
 639         if (test_bit(BR_FDB_LOCAL, &fdb->flags))
 640                 return NUD_PERMANENT;
 641         else if (test_bit(BR_FDB_STATIC, &fdb->flags))
 642                 return NUD_NOARP;
 643         else if (has_expired(br, fdb))
 644                 return NUD_STALE;
 645         else
 646                 return NUD_REACHABLE;
 647 }
 648
 649 static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
 650                          const struct net_bridge_fdb_entry *fdb,
 651                          u32 portid, u32 seq, int type, unsigned int flags)
 652 {
 653         unsigned long now = jiffies;
 654         struct nda_cacheinfo ci;
 655         struct nlmsghdr *nlh;
 656         struct ndmsg *ndm;
 657
 658         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 659         if (nlh == NULL)
 660                 return -EMSGSIZE;
 661
 662         ndm = nlmsg_data(nlh);
 663         ndm->ndm_family  = AF_BRIDGE;
 664         ndm->ndm_pad1    = 0;
 665         ndm->ndm_pad2    = 0;
 666         ndm->ndm_flags   = 0;
 667         ndm->ndm_type    = 0;
 668         ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
 669         ndm->ndm_state   = fdb_to_nud(br, fdb);
 670
 671         if (test_bit(BR_FDB_OFFLOADED, &fdb->flags))
 672                 ndm->ndm_flags |= NTF_OFFLOADED;
 673         if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
 674                 ndm->ndm_flags |= NTF_EXT_LEARNED;
 675         if (test_bit(BR_FDB_STICKY, &fdb->flags))
 676                 ndm->ndm_flags |= NTF_STICKY;
 677
 678         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.addr))
 679                 goto nla_put_failure;
 680         if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
 681                 goto nla_put_failure;
 682         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 683         ci.ndm_confirmed = 0;
 684         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 685         ci.ndm_refcnt    = 0;
 686         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 687                 goto nla_put_failure;
 688
 689         if (fdb->key.vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16),
 690                                         &fdb->key.vlan_id))
 691                 goto nla_put_failure;
 692
 693         if (test_bit(BR_FDB_NOTIFY, &fdb->flags)) {
 694                 struct nlattr *nest = nla_nest_start(skb, NDA_FDB_EXT_ATTRS);
 695                 u8 notify_bits = FDB_NOTIFY_BIT;
 696
 697                 if (!nest)
 698                         goto nla_put_failure;
 699                 if (test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags))
 700                         notify_bits |= FDB_NOTIFY_INACTIVE_BIT;
 701
 702                 if (nla_put_u8(skb, NFEA_ACTIVITY_NOTIFY, notify_bits)) {
 703                         nla_nest_cancel(skb, nest);
 704                         goto nla_put_failure;
 705                 }
 706
 707                 nla_nest_end(skb, nest);
 708         }
 709
 710         nlmsg_end(skb, nlh);
 711         return 0;
 712
 713 nla_put_failure:
 714         nlmsg_cancel(skb, nlh);
 715         return -EMSGSIZE;
 716 }
 717
 718 static inline size_t fdb_nlmsg_size(void)
 719 {
 720         return NLMSG_ALIGN(sizeof(struct ndmsg))
 721                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 722                 + nla_total_size(sizeof(u32)) /* NDA_MASTER */
 723                 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
 724                 + nla_total_size(sizeof(struct nda_cacheinfo))
 725                 + nla_total_size(0) /* NDA_FDB_EXT_ATTRS */
 726                 + nla_total_size(sizeof(u8)); /* NFEA_ACTIVITY_NOTIFY */
 727 }
 728
 729 static int br_fdb_replay_one(struct notifier_block *nb,
 730                              struct net_bridge_fdb_entry *fdb,
 731                              struct net_device *dev, const void *ctx)
 732 {
 733         struct switchdev_notifier_fdb_info item;
 734         int err;
 735
 736         item.addr = fdb->key.addr.addr;
 737         item.vid = fdb->key.vlan_id;
 738         item.added_by_user = test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
 739         item.offloaded = test_bit(BR_FDB_OFFLOADED, &fdb->flags);
 740         item.is_local = test_bit(BR_FDB_LOCAL, &fdb->flags);
 741         item.info.dev = dev;
 742         item.info.ctx = ctx;
 743
 744         err = nb->notifier_call(nb, SWITCHDEV_FDB_ADD_TO_DEVICE, &item);
 745         return notifier_to_errno(err);
 746 }
 747
 748 int br_fdb_replay(struct net_device *br_dev, struct net_device *dev,
 749                   const void *ctx, struct notifier_block *nb)
 750 {
 751         struct net_bridge_fdb_entry *fdb;
 752         struct net_bridge *br;
 753         int err = 0;
 754
 755         if (!netif_is_bridge_master(br_dev) || !netif_is_bridge_port(dev))
 756                 return -EINVAL;
 757
 758         br = netdev_priv(br_dev);
 759
 760         rcu_read_lock();
 761
 762         hlist_for_each_entry_rcu(fdb, &br->fdb_list, fdb_node) {
 763                 struct net_bridge_port *dst = READ_ONCE(fdb->dst);
 764                 struct net_device *dst_dev;
 765
 766                 dst_dev = dst ? dst->dev : br->dev;
 767                 if (dst_dev != br_dev && dst_dev != dev)
 768                         continue;
 769
 770                 err = br_fdb_replay_one(nb, fdb, dst_dev, ctx);
 771                 if (err)
 772                         break;
 773         }
 774
 775         rcu_read_unlock();
 776
 777         return err;
 778 }
 779 EXPORT_SYMBOL_GPL(br_fdb_replay);
 780
 781 static void fdb_notify(struct net_bridge *br,
 782                        const struct net_bridge_fdb_entry *fdb, int type,
 783                        bool swdev_notify)
 784 {
 785         struct net *net = dev_net(br->dev);
 786         struct sk_buff *skb;
 787         int err = -ENOBUFS;
 788
 789         if (swdev_notify)
 790                 br_switchdev_fdb_notify(fdb, type);
 791
 792         skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
 793         if (skb == NULL)
 794                 goto errout;
 795
 796         err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
 797         if (err < 0) {
 798                 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
 799                 WARN_ON(err == -EMSGSIZE);
 800                 kfree_skb(skb);
 801                 goto errout;
 802         }
 803         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 804         return;
 805 errout:
 806         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 807 }
 808
 809 /* Dump information about entries, in response to GETNEIGH */
 810 int br_fdb_dump(struct sk_buff *skb,
 811                 struct netlink_callback *cb,
 812                 struct net_device *dev,
 813                 struct net_device *filter_dev,
 814                 int *idx)
 815 {
 816         struct net_bridge *br = netdev_priv(dev);
 817         struct net_bridge_fdb_entry *f;
 818         int err = 0;
 819
 820         if (!(dev->priv_flags & IFF_EBRIDGE))
 821                 return err;
 822
 823         if (!filter_dev) {
 824                 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
 825                 if (err < 0)
 826                         return err;
 827         }
 828
 829         rcu_read_lock();
 830         hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
 831                 if (*idx < cb->args[2])
 832                         goto skip;
 833                 if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) {
 834                         if (filter_dev != dev)
 835                                 goto skip;
 836                         /* !f->dst is a special case for bridge
 837                          * It means the MAC belongs to the bridge
 838                          * Therefore need a little more filtering
 839                          * we only want to dump the !f->dst case
 840                          */
 841                         if (f->dst)
 842                                 goto skip;
 843                 }
 844                 if (!filter_dev && f->dst)
 845                         goto skip;
 846
 847                 err = fdb_fill_info(skb, br, f,
 848                                     NETLINK_CB(cb->skb).portid,
 849                                     cb->nlh->nlmsg_seq,
 850                                     RTM_NEWNEIGH,
 851                                     NLM_F_MULTI);
 852                 if (err < 0)
 853                         break;
 854 skip:
 855                 *idx += 1;
 856         }
 857         rcu_read_unlock();
 858
 859         return err;
 860 }
 861
 862 int br_fdb_get(struct sk_buff *skb,
 863                struct nlattr *tb[],
 864                struct net_device *dev,
 865                const unsigned char *addr,
 866                u16 vid, u32 portid, u32 seq,
 867                struct netlink_ext_ack *extack)
 868 {
 869         struct net_bridge *br = netdev_priv(dev);
 870         struct net_bridge_fdb_entry *f;
 871         int err = 0;
 872
 873         rcu_read_lock();
 874         f = br_fdb_find_rcu(br, addr, vid);
 875         if (!f) {
 876                 NL_SET_ERR_MSG(extack, "Fdb entry not found");
 877                 err = -ENOENT;
 878                 goto errout;
 879         }
 880
 881         err = fdb_fill_info(skb, br, f, portid, seq,
 882                             RTM_NEWNEIGH, 0);
 883 errout:
 884         rcu_read_unlock();
 885         return err;
 886 }
 887
 888 /* returns true if the fdb is modified */
 889 static bool fdb_handle_notify(struct net_bridge_fdb_entry *fdb, u8 notify)
 890 {
 891         bool modified = false;
 892
 893         /* allow to mark an entry as inactive, usually done on creation */
 894         if ((notify & FDB_NOTIFY_INACTIVE_BIT) &&
 895             !test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags))
 896                 modified = true;
 897
 898         if ((notify & FDB_NOTIFY_BIT) &&
 899             !test_and_set_bit(BR_FDB_NOTIFY, &fdb->flags)) {
 900                 /* enabled activity tracking */
 901                 modified = true;
 902         } else if (!(notify & FDB_NOTIFY_BIT) &&
 903                    test_and_clear_bit(BR_FDB_NOTIFY, &fdb->flags)) {
 904                 /* disabled activity tracking, clear notify state */
 905                 clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags);
 906                 modified = true;
 907         }
 908
 909         return modified;
 910 }
 911
 912 /* Update (create or replace) forwarding database entry */
 913 static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
 914                          const u8 *addr, struct ndmsg *ndm, u16 flags, u16 vid,
 915                          struct nlattr *nfea_tb[])
 916 {
 917         bool is_sticky = !!(ndm->ndm_flags & NTF_STICKY);
 918         bool refresh = !nfea_tb[NFEA_DONT_REFRESH];
 919         struct net_bridge_fdb_entry *fdb;
 920         u16 state = ndm->ndm_state;
 921         bool modified = false;
 922         u8 notify = 0;
 923
 924         /* If the port cannot learn allow only local and static entries */
 925         if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
 926             !(source->state == BR_STATE_LEARNING ||
 927               source->state == BR_STATE_FORWARDING))
 928                 return -EPERM;
 929
 930         if (!source && !(state & NUD_PERMANENT)) {
 931                 pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n",
 932                         br->dev->name);
 933                 return -EINVAL;
 934         }
 935
 936         if (is_sticky && (state & NUD_PERMANENT))
 937                 return -EINVAL;
 938
 939         if (nfea_tb[NFEA_ACTIVITY_NOTIFY]) {
 940                 notify = nla_get_u8(nfea_tb[NFEA_ACTIVITY_NOTIFY]);
 941                 if ((notify & ~BR_FDB_NOTIFY_SETTABLE_BITS) ||
 942                     (notify & BR_FDB_NOTIFY_SETTABLE_BITS) == FDB_NOTIFY_INACTIVE_BIT)
 943                         return -EINVAL;
 944         }
 945
 946         fdb = br_fdb_find(br, addr, vid);
 947         if (fdb == NULL) {
 948                 if (!(flags & NLM_F_CREATE))
 949                         return -ENOENT;
 950
 951                 fdb = fdb_create(br, source, addr, vid, 0);
 952                 if (!fdb)
 953                         return -ENOMEM;
 954
 955                 modified = true;
 956         } else {
 957                 if (flags & NLM_F_EXCL)
 958                         return -EEXIST;
 959
 960                 if (fdb->dst != source) {
 961                         fdb->dst = source;
 962                         modified = true;
 963                 }
 964         }
 965
 966         if (fdb_to_nud(br, fdb) != state) {
 967                 if (state & NUD_PERMANENT) {
 968                         set_bit(BR_FDB_LOCAL, &fdb->flags);
 969                         if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags))
 970                                 fdb_add_hw_addr(br, addr);
 971                 } else if (state & NUD_NOARP) {
 972                         clear_bit(BR_FDB_LOCAL, &fdb->flags);
 973                         if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags))
 974                                 fdb_add_hw_addr(br, addr);
 975                 } else {
 976                         clear_bit(BR_FDB_LOCAL, &fdb->flags);
 977                         if (test_and_clear_bit(BR_FDB_STATIC, &fdb->flags))
 978                                 fdb_del_hw_addr(br, addr);
 979                 }
 980
 981                 modified = true;
 982         }
 983
 984         if (is_sticky != test_bit(BR_FDB_STICKY, &fdb->flags)) {
 985                 change_bit(BR_FDB_STICKY, &fdb->flags);
 986                 modified = true;
 987         }
 988
 989         if (fdb_handle_notify(fdb, notify))
 990                 modified = true;
 991
 992         set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
 993
 994         fdb->used = jiffies;
 995         if (modified) {
 996                 if (refresh)
 997                         fdb->updated = jiffies;
 998                 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
 999         }
1000
1001         return 0;
1002 }
1003
1004 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
1005                         struct net_bridge_port *p, const unsigned char *addr,
1006                         u16 nlh_flags, u16 vid, struct nlattr *nfea_tb[])
1007 {
1008         int err = 0;
1009
1010         if (ndm->ndm_flags & NTF_USE) {
1011                 if (!p) {
1012                         pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n",
1013                                 br->dev->name);
1014                         return -EINVAL;
1015                 }
1016                 if (!nbp_state_should_learn(p))
1017                         return 0;
1018
1019                 local_bh_disable();
1020                 rcu_read_lock();
1021                 br_fdb_update(br, p, addr, vid, BIT(BR_FDB_ADDED_BY_USER));
1022                 rcu_read_unlock();
1023                 local_bh_enable();
1024         } else if (ndm->ndm_flags & NTF_EXT_LEARNED) {
1025                 err = br_fdb_external_learn_add(br, p, addr, vid, true);
1026         } else {
1027                 spin_lock_bh(&br->hash_lock);
1028                 err = fdb_add_entry(br, p, addr, ndm, nlh_flags, vid, nfea_tb);
1029                 spin_unlock_bh(&br->hash_lock);
1030         }
1031
1032         return err;
1033 }
1034
1035 static const struct nla_policy br_nda_fdb_pol[NFEA_MAX + 1] = {
1036         [NFEA_ACTIVITY_NOTIFY]  = { .type = NLA_U8 },
1037         [NFEA_DONT_REFRESH]     = { .type = NLA_FLAG },
1038 };
1039
1040 /* Add new permanent fdb entry with RTM_NEWNEIGH */
1041 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1042                struct net_device *dev,
1043                const unsigned char *addr, u16 vid, u16 nlh_flags,
1044                struct netlink_ext_ack *extack)
1045 {
1046         struct nlattr *nfea_tb[NFEA_MAX + 1], *attr;
1047         struct net_bridge_vlan_group *vg;
1048         struct net_bridge_port *p = NULL;
1049         struct net_bridge_vlan *v;
1050         struct net_bridge *br = NULL;
1051         int err = 0;
1052
1053         trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags);
1054
1055         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
1056                 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
1057                 return -EINVAL;
1058         }
1059
1060         if (is_zero_ether_addr(addr)) {
1061                 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
1062                 return -EINVAL;
1063         }
1064
1065         if (dev->priv_flags & IFF_EBRIDGE) {
1066                 br = netdev_priv(dev);
1067                 vg = br_vlan_group(br);
1068         } else {
1069                 p = br_port_get_rtnl(dev);
1070                 if (!p) {
1071                         pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
1072                                 dev->name);
1073                         return -EINVAL;
1074                 }
1075                 br = p->br;
1076                 vg = nbp_vlan_group(p);
1077         }
1078
1079         if (tb[NDA_FDB_EXT_ATTRS]) {
1080                 attr = tb[NDA_FDB_EXT_ATTRS];
1081                 err = nla_parse_nested(nfea_tb, NFEA_MAX, attr,
1082                                        br_nda_fdb_pol, extack);
1083                 if (err)
1084                         return err;
1085         } else {
1086                 memset(nfea_tb, 0, sizeof(struct nlattr *) * (NFEA_MAX + 1));
1087         }
1088
1089         if (vid) {
1090                 v = br_vlan_find(vg, vid);
1091                 if (!v || !br_vlan_should_use(v)) {
1092                         pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1093                         return -EINVAL;
1094                 }
1095
1096                 /* VID was specified, so use it. */
1097                 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid, nfea_tb);
1098         } else {
1099                 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0, nfea_tb);
1100                 if (err || !vg || !vg->num_vlans)
1101                         goto out;
1102
1103                 /* We have vlans configured on this port and user didn't
1104                  * specify a VLAN.  To be nice, add/update entry for every
1105                  * vlan on this port.
1106                  */
1107                 list_for_each_entry(v, &vg->vlan_list, vlist) {
1108                         if (!br_vlan_should_use(v))
1109                                 continue;
1110                         err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid,
1111                                            nfea_tb);
1112                         if (err)
1113                                 goto out;
1114                 }
1115         }
1116
1117 out:
1118         return err;
1119 }
1120
1121 static int fdb_delete_by_addr_and_port(struct net_bridge *br,
1122                                        const struct net_bridge_port *p,
1123                                        const u8 *addr, u16 vlan)
1124 {
1125         struct net_bridge_fdb_entry *fdb;
1126
1127         fdb = br_fdb_find(br, addr, vlan);
1128         if (!fdb || fdb->dst != p)
1129                 return -ENOENT;
1130
1131         fdb_delete(br, fdb, true);
1132
1133         return 0;
1134 }
1135
1136 static int __br_fdb_delete(struct net_bridge *br,
1137                            const struct net_bridge_port *p,
1138                            const unsigned char *addr, u16 vid)
1139 {
1140         int err;
1141
1142         spin_lock_bh(&br->hash_lock);
1143         err = fdb_delete_by_addr_and_port(br, p, addr, vid);
1144         spin_unlock_bh(&br->hash_lock);
1145
1146         return err;
1147 }
1148
1149 /* Remove neighbor entry with RTM_DELNEIGH */
1150 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1151                   struct net_device *dev,
1152                   const unsigned char *addr, u16 vid)
1153 {
1154         struct net_bridge_vlan_group *vg;
1155         struct net_bridge_port *p = NULL;
1156         struct net_bridge_vlan *v;
1157         struct net_bridge *br;
1158         int err;
1159
1160         if (dev->priv_flags & IFF_EBRIDGE) {
1161                 br = netdev_priv(dev);
1162                 vg = br_vlan_group(br);
1163         } else {
1164                 p = br_port_get_rtnl(dev);
1165                 if (!p) {
1166                         pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
1167                                 dev->name);
1168                         return -EINVAL;
1169                 }
1170                 vg = nbp_vlan_group(p);
1171                 br = p->br;
1172         }
1173
1174         if (vid) {
1175                 v = br_vlan_find(vg, vid);
1176                 if (!v) {
1177                         pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1178                         return -EINVAL;
1179                 }
1180
1181                 err = __br_fdb_delete(br, p, addr, vid);
1182         } else {
1183                 err = -ENOENT;
1184                 err &= __br_fdb_delete(br, p, addr, 0);
1185                 if (!vg || !vg->num_vlans)
1186                         return err;
1187
1188                 list_for_each_entry(v, &vg->vlan_list, vlist) {
1189                         if (!br_vlan_should_use(v))
1190                                 continue;
1191                         err &= __br_fdb_delete(br, p, addr, v->vid);
1192                 }
1193         }
1194
1195         return err;
1196 }
1197
1198 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
1199 {
1200         struct net_bridge_fdb_entry *f, *tmp;
1201         int err = 0;
1202
1203         ASSERT_RTNL();
1204
1205         /* the key here is that static entries change only under rtnl */
1206         rcu_read_lock();
1207         hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1208                 /* We only care for static entries */
1209                 if (!test_bit(BR_FDB_STATIC, &f->flags))
1210                         continue;
1211                 err = dev_uc_add(p->dev, f->key.addr.addr);
1212                 if (err)
1213                         goto rollback;
1214         }
1215 done:
1216         rcu_read_unlock();
1217
1218         return err;
1219
1220 rollback:
1221         hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) {
1222                 /* We only care for static entries */
1223                 if (!test_bit(BR_FDB_STATIC, &tmp->flags))
1224                         continue;
1225                 if (tmp == f)
1226                         break;
1227                 dev_uc_del(p->dev, tmp->key.addr.addr);
1228         }
1229
1230         goto done;
1231 }
1232
1233 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
1234 {
1235         struct net_bridge_fdb_entry *f;
1236
1237         ASSERT_RTNL();
1238
1239         rcu_read_lock();
1240         hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1241                 /* We only care for static entries */
1242                 if (!test_bit(BR_FDB_STATIC, &f->flags))
1243                         continue;
1244
1245                 dev_uc_del(p->dev, f->key.addr.addr);
1246         }
1247         rcu_read_unlock();
1248 }
1249
1250 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
1251                               const unsigned char *addr, u16 vid,
1252                               bool swdev_notify)
1253 {
1254         struct net_bridge_fdb_entry *fdb;
1255         bool modified = false;
1256         int err = 0;
1257
1258         trace_br_fdb_external_learn_add(br, p, addr, vid);
1259
1260         spin_lock_bh(&br->hash_lock);
1261
1262         fdb = br_fdb_find(br, addr, vid);
1263         if (!fdb) {
1264                 unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN);
1265
1266                 if (swdev_notify)
1267                         flags |= BIT(BR_FDB_ADDED_BY_USER);
1268                 fdb = fdb_create(br, p, addr, vid, flags);
1269                 if (!fdb) {
1270                         err = -ENOMEM;
1271                         goto err_unlock;
1272                 }
1273                 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1274         } else {
1275                 fdb->updated = jiffies;
1276
1277                 if (fdb->dst != p) {
1278                         fdb->dst = p;
1279                         modified = true;
1280                 }
1281
1282                 if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) {
1283                         /* Refresh entry */
1284                         fdb->used = jiffies;
1285                 } else if (!test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags)) {
1286                         /* Take over SW learned entry */
1287                         set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags);
1288                         modified = true;
1289                 }
1290
1291                 if (swdev_notify)
1292                         set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
1293
1294                 if (modified)
1295                         fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1296         }
1297
1298 err_unlock:
1299         spin_unlock_bh(&br->hash_lock);
1300
1301         return err;
1302 }
1303
1304 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
1305                               const unsigned char *addr, u16 vid,
1306                               bool swdev_notify)
1307 {
1308         struct net_bridge_fdb_entry *fdb;
1309         int err = 0;
1310
1311         spin_lock_bh(&br->hash_lock);
1312
1313         fdb = br_fdb_find(br, addr, vid);
1314         if (fdb && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
1315                 fdb_delete(br, fdb, swdev_notify);
1316         else
1317                 err = -ENOENT;
1318
1319         spin_unlock_bh(&br->hash_lock);
1320
1321         return err;
1322 }
1323
1324 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
1325                           const unsigned char *addr, u16 vid, bool offloaded)
1326 {
1327         struct net_bridge_fdb_entry *fdb;
1328
1329         spin_lock_bh(&br->hash_lock);
1330
1331         fdb = br_fdb_find(br, addr, vid);
1332         if (fdb && offloaded != test_bit(BR_FDB_OFFLOADED, &fdb->flags))
1333                 change_bit(BR_FDB_OFFLOADED, &fdb->flags);
1334
1335         spin_unlock_bh(&br->hash_lock);
1336 }
1337
1338 void br_fdb_clear_offload(const struct net_device *dev, u16 vid)
1339 {
1340         struct net_bridge_fdb_entry *f;
1341         struct net_bridge_port *p;
1342
1343         ASSERT_RTNL();
1344
1345         p = br_port_get_rtnl(dev);
1346         if (!p)
1347                 return;
1348
1349         spin_lock_bh(&p->br->hash_lock);
1350         hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) {
1351                 if (f->dst == p && f->key.vlan_id == vid)
1352                         clear_bit(BR_FDB_OFFLOADED, &f->flags);
1353         }
1354         spin_unlock_bh(&p->br->hash_lock);
1355 }
1356 EXPORT_SYMBOL_GPL(br_fdb_clear_offload);