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