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 <linux/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 36 int __init br_fdb_init(void) 37 { 38 br_fdb_cache = KMEM_CACHE(net_bridge_fdb_entry, SLAB_HWCACHE_ALIGN); 39 if (!br_fdb_cache) 40 return -ENOMEM; 41 42 return 0; 43 } 44 45 void br_fdb_fini(void) 46 { 47 kmem_cache_destroy(br_fdb_cache); 48 } 49 50 int br_fdb_hash_init(struct net_bridge *br) 51 { 52 return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params); 53 } 54 55 void br_fdb_hash_fini(struct net_bridge *br) 56 { 57 rhashtable_destroy(&br->fdb_hash_tbl); 58 } 59 60 /* if topology_changing then use forward_delay (default 15 sec) 61 * otherwise keep longer (default 5 minutes) 62 */ 63 static inline unsigned long hold_time(const struct net_bridge *br) 64 { 65 return br->topology_change ? br->forward_delay : br->ageing_time; 66 } 67 68 static inline int has_expired(const struct net_bridge *br, 69 const struct net_bridge_fdb_entry *fdb) 70 { 71 return !test_bit(BR_FDB_STATIC, &fdb->flags) && 72 !test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags) && 73 time_before_eq(READ_ONCE(fdb->updated) + hold_time(br), jiffies); 74 } 75 76 static int fdb_to_nud(const struct net_bridge *br, 77 const struct net_bridge_fdb_entry *fdb) 78 { 79 if (test_bit(BR_FDB_LOCAL, &fdb->flags)) 80 return NUD_PERMANENT; 81 else if (test_bit(BR_FDB_STATIC, &fdb->flags)) 82 return NUD_NOARP; 83 else if (has_expired(br, fdb)) 84 return NUD_STALE; 85 else 86 return NUD_REACHABLE; 87 } 88 89 static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br, 90 const struct net_bridge_fdb_entry *fdb, 91 u32 portid, u32 seq, int type, unsigned int flags) 92 { 93 const struct net_bridge_port *dst = br_fdb_dst_port(fdb); 94 unsigned long now = jiffies; 95 struct nda_cacheinfo ci; 96 struct nlmsghdr *nlh; 97 struct ndmsg *ndm; 98 u32 ext_flags = 0; 99 100 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); 101 if (nlh == NULL) 102 return -EMSGSIZE; 103 104 ndm = nlmsg_data(nlh); 105 ndm->ndm_family = AF_BRIDGE; 106 ndm->ndm_pad1 = 0; 107 ndm->ndm_pad2 = 0; 108 ndm->ndm_flags = 0; 109 ndm->ndm_type = 0; 110 ndm->ndm_ifindex = dst ? dst->dev->ifindex : br->dev->ifindex; 111 ndm->ndm_state = fdb_to_nud(br, fdb); 112 113 if (test_bit(BR_FDB_OFFLOADED, &fdb->flags)) 114 ndm->ndm_flags |= NTF_OFFLOADED; 115 if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) 116 ndm->ndm_flags |= NTF_EXT_LEARNED; 117 if (test_bit(BR_FDB_STICKY, &fdb->flags)) 118 ndm->ndm_flags |= NTF_STICKY; 119 if (test_bit(BR_FDB_LOCKED, &fdb->flags)) 120 ext_flags |= NTF_EXT_LOCKED; 121 122 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.addr)) 123 goto nla_put_failure; 124 if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex)) 125 goto nla_put_failure; 126 if (nla_put_u32(skb, NDA_FLAGS_EXT, ext_flags)) 127 goto nla_put_failure; 128 129 ci.ndm_used = jiffies_to_clock_t(now - READ_ONCE(fdb->used)); 130 ci.ndm_confirmed = 0; 131 ci.ndm_updated = jiffies_to_clock_t(now - READ_ONCE(fdb->updated)); 132 ci.ndm_refcnt = 0; 133 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) 134 goto nla_put_failure; 135 136 if (fdb->key.vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16), 137 &fdb->key.vlan_id)) 138 goto nla_put_failure; 139 140 if (test_bit(BR_FDB_NOTIFY, &fdb->flags)) { 141 struct nlattr *nest = nla_nest_start(skb, NDA_FDB_EXT_ATTRS); 142 u8 notify_bits = FDB_NOTIFY_BIT; 143 144 if (!nest) 145 goto nla_put_failure; 146 if (test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags)) 147 notify_bits |= FDB_NOTIFY_INACTIVE_BIT; 148 149 if (nla_put_u8(skb, NFEA_ACTIVITY_NOTIFY, notify_bits)) { 150 nla_nest_cancel(skb, nest); 151 goto nla_put_failure; 152 } 153 154 nla_nest_end(skb, nest); 155 } 156 157 nlmsg_end(skb, nlh); 158 return 0; 159 160 nla_put_failure: 161 nlmsg_cancel(skb, nlh); 162 return -EMSGSIZE; 163 } 164 165 static inline size_t fdb_nlmsg_size(void) 166 { 167 return NLMSG_ALIGN(sizeof(struct ndmsg)) 168 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ 169 + nla_total_size(sizeof(u32)) /* NDA_MASTER */ 170 + nla_total_size(sizeof(u32)) /* NDA_FLAGS_EXT */ 171 + nla_total_size(sizeof(u16)) /* NDA_VLAN */ 172 + nla_total_size(sizeof(struct nda_cacheinfo)) 173 + nla_total_size(0) /* NDA_FDB_EXT_ATTRS */ 174 + nla_total_size(sizeof(u8)); /* NFEA_ACTIVITY_NOTIFY */ 175 } 176 177 static void fdb_notify(struct net_bridge *br, 178 const struct net_bridge_fdb_entry *fdb, int type, 179 bool swdev_notify) 180 { 181 struct net *net = dev_net(br->dev); 182 struct sk_buff *skb; 183 int err = -ENOBUFS; 184 185 if (swdev_notify) 186 br_switchdev_fdb_notify(br, fdb, type); 187 188 skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC); 189 if (skb == NULL) 190 goto errout; 191 192 err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0); 193 if (err < 0) { 194 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */ 195 WARN_ON(err == -EMSGSIZE); 196 kfree_skb(skb); 197 goto errout; 198 } 199 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 200 return; 201 errout: 202 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 203 } 204 205 static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl, 206 const unsigned char *addr, 207 __u16 vid) 208 { 209 struct net_bridge_fdb_key key; 210 211 WARN_ON_ONCE(!rcu_read_lock_held()); 212 213 key.vlan_id = vid; 214 memcpy(key.addr.addr, addr, sizeof(key.addr.addr)); 215 216 return rhashtable_lookup(tbl, &key, br_fdb_rht_params); 217 } 218 219 /* requires bridge hash_lock */ 220 static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br, 221 const unsigned char *addr, 222 __u16 vid) 223 { 224 struct net_bridge_fdb_entry *fdb; 225 226 lockdep_assert_held_once(&br->hash_lock); 227 228 rcu_read_lock(); 229 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid); 230 rcu_read_unlock(); 231 232 return fdb; 233 } 234 235 struct net_device *br_fdb_find_port(const struct net_device *br_dev, 236 const unsigned char *addr, 237 __u16 vid) 238 { 239 const struct net_bridge_port *dst; 240 struct net_bridge_fdb_entry *f; 241 struct net_device *dev = NULL; 242 struct net_bridge *br; 243 244 ASSERT_RTNL(); 245 246 if (!netif_is_bridge_master(br_dev)) 247 return NULL; 248 249 br = netdev_priv(br_dev); 250 rcu_read_lock(); 251 f = br_fdb_find_rcu(br, addr, vid); 252 if (f) { 253 dst = br_fdb_dst_port(f); 254 if (dst) 255 dev = dst->dev; 256 } 257 rcu_read_unlock(); 258 259 return dev; 260 } 261 EXPORT_SYMBOL_GPL(br_fdb_find_port); 262 263 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 264 const unsigned char *addr, 265 __u16 vid) 266 { 267 return fdb_find_rcu(&br->fdb_hash_tbl, addr, vid); 268 } 269 270 /* When a static FDB entry is added, the mac address from the entry is 271 * added to the bridge private HW address list and all required ports 272 * are then updated with the new information. 273 * Called under RTNL. 274 */ 275 static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr) 276 { 277 int err; 278 struct net_bridge_port *p; 279 280 ASSERT_RTNL(); 281 282 list_for_each_entry(p, &br->port_list, list) { 283 if (!br_promisc_port(p)) { 284 err = dev_uc_add(p->dev, addr); 285 if (err) 286 goto undo; 287 } 288 } 289 290 return; 291 undo: 292 list_for_each_entry_continue_reverse(p, &br->port_list, list) { 293 if (!br_promisc_port(p)) 294 dev_uc_del(p->dev, addr); 295 } 296 } 297 298 /* When a static FDB entry is deleted, the HW address from that entry is 299 * also removed from the bridge private HW address list and updates all 300 * the ports with needed information. 301 * Called under RTNL. 302 */ 303 static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr) 304 { 305 struct net_bridge_port *p; 306 307 ASSERT_RTNL(); 308 309 list_for_each_entry(p, &br->port_list, list) { 310 if (!br_promisc_port(p)) 311 dev_uc_del(p->dev, addr); 312 } 313 } 314 315 static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f, 316 bool swdev_notify) 317 { 318 trace_fdb_delete(br, f, br_fdb_dst_port(f)); 319 320 if (test_bit(BR_FDB_STATIC, &f->flags)) 321 fdb_del_hw_addr(br, f->key.addr.addr); 322 323 hlist_del_init_rcu(&f->fdb_node); 324 rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode, 325 br_fdb_rht_params); 326 if (test_and_clear_bit(BR_FDB_DYNAMIC_LEARNED, &f->flags)) 327 atomic_dec(&br->fdb_n_learned); 328 fdb_notify(br, f, RTM_DELNEIGH, swdev_notify); 329 kfree_rcu(f, rcu); 330 } 331 332 /* Delete a local entry if no other port had the same address. 333 * 334 * This function should only be called on entries with BR_FDB_LOCAL set, 335 * so even with BR_FDB_ADDED_BY_USER cleared we never need to increase 336 * the accounting for dynamically learned entries again. 337 */ 338 static void fdb_delete_local(struct net_bridge *br, 339 const struct net_bridge_port *p, 340 struct net_bridge_fdb_entry *f) 341 { 342 const unsigned char *addr = f->key.addr.addr; 343 struct net_bridge_vlan_group *vg; 344 const struct net_bridge_vlan *v; 345 struct net_bridge_port *op; 346 u16 vid = f->key.vlan_id; 347 348 /* Maybe another port has same hw addr? */ 349 list_for_each_entry(op, &br->port_list, list) { 350 vg = nbp_vlan_group(op); 351 if (op != p && ether_addr_equal(op->dev->dev_addr, addr) && 352 (!vid || br_vlan_find(vg, vid))) { 353 br_fdb_dst_write(f, br_port_to_dst(op)); 354 clear_bit(BR_FDB_ADDED_BY_USER, &f->flags); 355 return; 356 } 357 } 358 359 vg = br_vlan_group(br); 360 v = br_vlan_find(vg, vid); 361 /* Maybe bridge device has same hw addr? */ 362 if (p && ether_addr_equal(br->dev->dev_addr, addr) && 363 (!vid || (v && br_vlan_should_use(v)))) { 364 br_fdb_dst_write(f, br_port_to_dst(NULL)); 365 clear_bit(BR_FDB_ADDED_BY_USER, &f->flags); 366 return; 367 } 368 369 fdb_delete(br, f, true); 370 } 371 372 void br_fdb_find_delete_local(struct net_bridge *br, 373 const struct net_bridge_port *p, 374 const unsigned char *addr, u16 vid) 375 { 376 struct net_bridge_fdb_entry *f; 377 378 spin_lock_bh(&br->hash_lock); 379 f = br_fdb_find(br, addr, vid); 380 if (f && test_bit(BR_FDB_LOCAL, &f->flags) && 381 !test_bit(BR_FDB_ADDED_BY_USER, &f->flags) && 382 br_fdb_dst_port(f) == p) 383 fdb_delete_local(br, p, f); 384 spin_unlock_bh(&br->hash_lock); 385 } 386 387 static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br, 388 struct net_bridge_dst dst, 389 const unsigned char *addr, 390 __u16 vid, 391 unsigned long flags) 392 { 393 bool learned = !test_bit(BR_FDB_ADDED_BY_USER, &flags) && 394 !test_bit(BR_FDB_LOCAL, &flags); 395 u32 max_learned = READ_ONCE(br->fdb_max_learned); 396 struct net_bridge_fdb_entry *fdb; 397 int err; 398 399 if (likely(learned)) { 400 int n_learned = atomic_read(&br->fdb_n_learned); 401 402 if (unlikely(max_learned && n_learned >= max_learned)) 403 return NULL; 404 __set_bit(BR_FDB_DYNAMIC_LEARNED, &flags); 405 } 406 407 fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC); 408 if (!fdb) 409 return NULL; 410 411 memcpy(fdb->key.addr.addr, addr, ETH_ALEN); 412 br_fdb_dst_write(fdb, dst); 413 fdb->key.vlan_id = vid; 414 fdb->flags = flags; 415 fdb->updated = fdb->used = jiffies; 416 err = rhashtable_lookup_insert_fast(&br->fdb_hash_tbl, &fdb->rhnode, 417 br_fdb_rht_params); 418 if (err) { 419 kmem_cache_free(br_fdb_cache, fdb); 420 return NULL; 421 } 422 423 if (likely(learned)) 424 atomic_inc(&br->fdb_n_learned); 425 426 hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list); 427 428 return fdb; 429 } 430 431 static int fdb_add_local(struct net_bridge *br, struct net_bridge_port *source, 432 const unsigned char *addr, u16 vid) 433 { 434 struct net_bridge_fdb_entry *fdb; 435 436 if (!is_valid_ether_addr(addr)) 437 return -EINVAL; 438 439 fdb = br_fdb_find(br, addr, vid); 440 if (fdb) { 441 /* it is okay to have multiple ports with same 442 * address, just use the first one. 443 */ 444 if (test_bit(BR_FDB_LOCAL, &fdb->flags)) 445 return 0; 446 br_warn(br, "adding interface %s with same address as a received packet (addr:%pM, vlan:%u)\n", 447 source ? source->dev->name : br->dev->name, addr, vid); 448 fdb_delete(br, fdb, true); 449 } 450 451 fdb = fdb_create(br, br_port_to_dst(source), addr, vid, 452 BIT(BR_FDB_LOCAL) | BIT(BR_FDB_STATIC)); 453 if (!fdb) 454 return -ENOMEM; 455 456 fdb_add_hw_addr(br, addr); 457 fdb_notify(br, fdb, RTM_NEWNEIGH, true); 458 return 0; 459 } 460 461 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr) 462 { 463 struct net_bridge_vlan_group *vg; 464 struct net_bridge_fdb_entry *f; 465 struct net_bridge *br = p->br; 466 struct net_bridge_vlan *v; 467 bool local_vlan_0; 468 469 local_vlan_0 = br_opt_get(br, BROPT_FDB_LOCAL_VLAN_0); 470 471 spin_lock_bh(&br->hash_lock); 472 vg = nbp_vlan_group(p); 473 hlist_for_each_entry(f, &br->fdb_list, fdb_node) { 474 if (br_fdb_dst_port(f) == p && 475 test_bit(BR_FDB_LOCAL, &f->flags) && 476 !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) { 477 /* delete old one */ 478 fdb_delete_local(br, p, f); 479 480 /* if this port has no vlan information configured, or 481 * local entries are only kept on VLAN 0, we can safely 482 * be done at this point. 483 */ 484 if (!vg || !vg->num_vlans || local_vlan_0) 485 goto insert; 486 } 487 } 488 489 insert: 490 /* insert new address, may fail if invalid address or dup. */ 491 fdb_add_local(br, p, newaddr, 0); 492 493 if (!vg || !vg->num_vlans || local_vlan_0) 494 goto done; 495 496 /* Now add entries for every VLAN configured on the port. 497 * This function runs under RTNL so the bitmap will not change 498 * from under us. 499 */ 500 list_for_each_entry(v, &vg->vlan_list, vlist) 501 fdb_add_local(br, p, newaddr, v->vid); 502 503 done: 504 spin_unlock_bh(&br->hash_lock); 505 } 506 507 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) 508 { 509 struct net_bridge_vlan_group *vg; 510 struct net_bridge_fdb_entry *f; 511 struct net_bridge_vlan *v; 512 bool local_vlan_0; 513 514 local_vlan_0 = br_opt_get(br, BROPT_FDB_LOCAL_VLAN_0); 515 516 spin_lock_bh(&br->hash_lock); 517 518 /* If old entry was unassociated with any port, then delete it. */ 519 f = br_fdb_find(br, br->dev->dev_addr, 0); 520 if (f && test_bit(BR_FDB_LOCAL, &f->flags) && 521 !br_fdb_dst_port(f) && 522 !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) 523 fdb_delete_local(br, NULL, f); 524 525 fdb_add_local(br, NULL, newaddr, 0); 526 vg = br_vlan_group(br); 527 if (!vg || !vg->num_vlans || local_vlan_0) 528 goto out; 529 /* Now remove and add entries for every VLAN configured on the 530 * bridge. This function runs under RTNL so the bitmap will not 531 * change from under us. 532 */ 533 list_for_each_entry(v, &vg->vlan_list, vlist) { 534 if (!br_vlan_should_use(v)) 535 continue; 536 f = br_fdb_find(br, br->dev->dev_addr, v->vid); 537 if (f && test_bit(BR_FDB_LOCAL, &f->flags) && 538 !br_fdb_dst_port(f) && 539 !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) 540 fdb_delete_local(br, NULL, f); 541 fdb_add_local(br, NULL, newaddr, v->vid); 542 } 543 out: 544 spin_unlock_bh(&br->hash_lock); 545 } 546 547 void br_fdb_cleanup(struct work_struct *work) 548 { 549 struct net_bridge *br = container_of(work, struct net_bridge, 550 gc_work.work); 551 struct net_bridge_fdb_entry *f = NULL; 552 unsigned long delay = hold_time(br); 553 unsigned long work_delay = delay; 554 unsigned long now = jiffies; 555 556 /* this part is tricky, in order to avoid blocking learning and 557 * consequently forwarding, we rely on rcu to delete objects with 558 * delayed freeing allowing us to continue traversing 559 */ 560 rcu_read_lock(); 561 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 562 unsigned long this_timer = READ_ONCE(f->updated) + delay; 563 564 if (test_bit(BR_FDB_STATIC, &f->flags) || 565 test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags)) { 566 if (test_bit(BR_FDB_NOTIFY, &f->flags)) { 567 if (time_after(this_timer, now)) 568 work_delay = min(work_delay, 569 this_timer - now); 570 else if (!test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, 571 &f->flags)) 572 fdb_notify(br, f, RTM_NEWNEIGH, false); 573 } 574 continue; 575 } 576 577 if (time_after(this_timer, now)) { 578 work_delay = min(work_delay, this_timer - now); 579 } else { 580 spin_lock_bh(&br->hash_lock); 581 if (!hlist_unhashed(&f->fdb_node)) 582 fdb_delete(br, f, true); 583 spin_unlock_bh(&br->hash_lock); 584 } 585 } 586 rcu_read_unlock(); 587 588 /* Cleanup minimum 10 milliseconds apart */ 589 work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10)); 590 mod_delayed_work(system_long_wq, &br->gc_work, work_delay); 591 } 592 593 static void br_fdb_delete_locals_per_vlan_port(struct net_bridge *br, 594 struct net_bridge_port *p) 595 { 596 struct net_bridge_vlan_group *vg; 597 struct net_bridge_vlan *v; 598 struct net_device *dev; 599 600 if (p) { 601 vg = nbp_vlan_group(p); 602 dev = p->dev; 603 } else { 604 vg = br_vlan_group(br); 605 dev = br->dev; 606 } 607 608 if (!vg) 609 return; 610 611 list_for_each_entry(v, &vg->vlan_list, vlist) 612 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid); 613 } 614 615 static void br_fdb_delete_locals_per_vlan(struct net_bridge *br) 616 { 617 struct net_bridge_port *p; 618 619 ASSERT_RTNL(); 620 621 list_for_each_entry(p, &br->port_list, list) 622 br_fdb_delete_locals_per_vlan_port(br, p); 623 624 br_fdb_delete_locals_per_vlan_port(br, NULL); 625 } 626 627 static int br_fdb_insert_locals_per_vlan_port(struct net_bridge *br, 628 struct net_bridge_port *p, 629 struct netlink_ext_ack *extack) 630 { 631 struct net_bridge_vlan_group *vg; 632 struct net_bridge_vlan *v; 633 struct net_device *dev; 634 int err; 635 636 if (p) { 637 vg = nbp_vlan_group(p); 638 dev = p->dev; 639 } else { 640 vg = br_vlan_group(br); 641 dev = br->dev; 642 } 643 644 if (!vg) 645 return 0; 646 647 list_for_each_entry(v, &vg->vlan_list, vlist) { 648 if (!br_vlan_should_use(v)) 649 continue; 650 651 err = br_fdb_add_local(br, p, dev->dev_addr, v->vid); 652 if (err) 653 return err; 654 } 655 656 return 0; 657 } 658 659 static int br_fdb_insert_locals_per_vlan(struct net_bridge *br, 660 struct netlink_ext_ack *extack) 661 { 662 struct net_bridge_port *p; 663 int err; 664 665 ASSERT_RTNL(); 666 667 list_for_each_entry(p, &br->port_list, list) { 668 err = br_fdb_insert_locals_per_vlan_port(br, p, extack); 669 if (err) 670 goto rollback; 671 } 672 673 err = br_fdb_insert_locals_per_vlan_port(br, NULL, extack); 674 if (err) 675 goto rollback; 676 677 return 0; 678 679 rollback: 680 NL_SET_ERR_MSG_MOD(extack, "fdb_local_vlan_0 toggle: FDB entry insertion failed"); 681 br_fdb_delete_locals_per_vlan(br); 682 return err; 683 } 684 685 int br_fdb_toggle_local_vlan_0(struct net_bridge *br, bool on, 686 struct netlink_ext_ack *extack) 687 { 688 if (!on) 689 return br_fdb_insert_locals_per_vlan(br, extack); 690 691 br_fdb_delete_locals_per_vlan(br); 692 return 0; 693 } 694 695 static bool __fdb_flush_matches(const struct net_bridge *br, 696 const struct net_bridge_fdb_entry *f, 697 const struct net_bridge_fdb_flush_desc *desc) 698 { 699 const struct net_bridge_port *dst = br_fdb_dst_port(f); 700 int port_ifidx = dst ? dst->dev->ifindex : br->dev->ifindex; 701 702 if (desc->vlan_id && desc->vlan_id != f->key.vlan_id) 703 return false; 704 if (desc->port_ifindex && desc->port_ifindex != port_ifidx) 705 return false; 706 if (desc->flags_mask && (f->flags & desc->flags_mask) != desc->flags) 707 return false; 708 709 return true; 710 } 711 712 /* Flush forwarding database entries matching the description */ 713 void br_fdb_flush(struct net_bridge *br, 714 const struct net_bridge_fdb_flush_desc *desc) 715 { 716 struct net_bridge_fdb_entry *f; 717 718 rcu_read_lock(); 719 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 720 if (!__fdb_flush_matches(br, f, desc)) 721 continue; 722 723 spin_lock_bh(&br->hash_lock); 724 if (!hlist_unhashed(&f->fdb_node)) 725 fdb_delete(br, f, true); 726 spin_unlock_bh(&br->hash_lock); 727 } 728 rcu_read_unlock(); 729 } 730 731 static unsigned long __ndm_state_to_fdb_flags(u16 ndm_state) 732 { 733 unsigned long flags = 0; 734 735 if (ndm_state & NUD_PERMANENT) 736 __set_bit(BR_FDB_LOCAL, &flags); 737 if (ndm_state & NUD_NOARP) 738 __set_bit(BR_FDB_STATIC, &flags); 739 740 return flags; 741 } 742 743 static unsigned long __ndm_flags_to_fdb_flags(u8 ndm_flags) 744 { 745 unsigned long flags = 0; 746 747 if (ndm_flags & NTF_USE) 748 __set_bit(BR_FDB_ADDED_BY_USER, &flags); 749 if (ndm_flags & NTF_EXT_LEARNED) 750 __set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &flags); 751 if (ndm_flags & NTF_OFFLOADED) 752 __set_bit(BR_FDB_OFFLOADED, &flags); 753 if (ndm_flags & NTF_STICKY) 754 __set_bit(BR_FDB_STICKY, &flags); 755 756 return flags; 757 } 758 759 static int __fdb_flush_validate_ifindex(const struct net_bridge *br, 760 int ifindex, 761 struct netlink_ext_ack *extack) 762 { 763 const struct net_device *dev; 764 765 dev = __dev_get_by_index(dev_net(br->dev), ifindex); 766 if (!dev) { 767 NL_SET_ERR_MSG_MOD(extack, "Unknown flush device ifindex"); 768 return -ENODEV; 769 } 770 if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev)) { 771 NL_SET_ERR_MSG_MOD(extack, "Flush device is not a bridge or bridge port"); 772 return -EINVAL; 773 } 774 if (netif_is_bridge_master(dev) && dev != br->dev) { 775 NL_SET_ERR_MSG_MOD(extack, 776 "Flush bridge device does not match target bridge device"); 777 return -EINVAL; 778 } 779 if (netif_is_bridge_port(dev)) { 780 struct net_bridge_port *p = br_port_get_rtnl(dev); 781 782 if (p->br != br) { 783 NL_SET_ERR_MSG_MOD(extack, "Port belongs to a different bridge device"); 784 return -EINVAL; 785 } 786 } 787 788 return 0; 789 } 790 791 static const struct nla_policy br_fdb_del_bulk_policy[NDA_MAX + 1] = { 792 [NDA_VLAN] = NLA_POLICY_RANGE(NLA_U16, 1, VLAN_N_VID - 2), 793 [NDA_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 1), 794 [NDA_NDM_STATE_MASK] = { .type = NLA_U16 }, 795 [NDA_NDM_FLAGS_MASK] = { .type = NLA_U8 }, 796 }; 797 798 int br_fdb_delete_bulk(struct nlmsghdr *nlh, struct net_device *dev, 799 struct netlink_ext_ack *extack) 800 { 801 struct net_bridge_fdb_flush_desc desc = {}; 802 struct ndmsg *ndm = nlmsg_data(nlh); 803 struct net_bridge_port *p = NULL; 804 struct nlattr *tb[NDA_MAX + 1]; 805 struct net_bridge *br; 806 u8 ndm_flags; 807 int err; 808 809 ndm_flags = ndm->ndm_flags & ~FDB_FLUSH_IGNORED_NDM_FLAGS; 810 811 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, 812 br_fdb_del_bulk_policy, extack); 813 if (err) 814 return err; 815 816 if (netif_is_bridge_master(dev)) { 817 br = netdev_priv(dev); 818 } else { 819 p = br_port_get_rtnl(dev); 820 if (!p) { 821 NL_SET_ERR_MSG_MOD(extack, "Device is not a bridge port"); 822 return -EINVAL; 823 } 824 br = p->br; 825 } 826 827 if (tb[NDA_VLAN]) 828 desc.vlan_id = nla_get_u16(tb[NDA_VLAN]); 829 830 if (ndm_flags & ~FDB_FLUSH_ALLOWED_NDM_FLAGS) { 831 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm flag bits set"); 832 return -EINVAL; 833 } 834 if (ndm->ndm_state & ~FDB_FLUSH_ALLOWED_NDM_STATES) { 835 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm state bits set"); 836 return -EINVAL; 837 } 838 839 desc.flags |= __ndm_state_to_fdb_flags(ndm->ndm_state); 840 desc.flags |= __ndm_flags_to_fdb_flags(ndm_flags); 841 if (tb[NDA_NDM_STATE_MASK]) { 842 u16 ndm_state_mask = nla_get_u16(tb[NDA_NDM_STATE_MASK]); 843 844 desc.flags_mask |= __ndm_state_to_fdb_flags(ndm_state_mask); 845 } 846 if (tb[NDA_NDM_FLAGS_MASK]) { 847 u8 ndm_flags_mask = nla_get_u8(tb[NDA_NDM_FLAGS_MASK]); 848 849 desc.flags_mask |= __ndm_flags_to_fdb_flags(ndm_flags_mask); 850 } 851 if (tb[NDA_IFINDEX]) { 852 int ifidx = nla_get_s32(tb[NDA_IFINDEX]); 853 854 err = __fdb_flush_validate_ifindex(br, ifidx, extack); 855 if (err) 856 return err; 857 desc.port_ifindex = ifidx; 858 } else if (p) { 859 /* flush was invoked with port device and NTF_MASTER */ 860 desc.port_ifindex = p->dev->ifindex; 861 } 862 863 br_debug(br, "flushing port ifindex: %d vlan id: %u flags: 0x%lx flags mask: 0x%lx\n", 864 desc.port_ifindex, desc.vlan_id, desc.flags, desc.flags_mask); 865 866 br_fdb_flush(br, &desc); 867 868 return 0; 869 } 870 871 /* Clean up entries referring to cleanup_dst's port. 872 * If do_all is set ignore vid and entry flags. Otherwise vid selects 873 * the VLAN (0 means all), keeping static and non-offloaded ext learned entries. 874 * For a port-VLAN dst, vid must match its VLAN ID. Always clean up its local 875 * entry unless user-added and fall back to the port dst for retained entries. 876 */ 877 void br_fdb_cleanup_by_dst(struct net_bridge *br, 878 struct net_bridge_dst cleanup_dst, u16 vid, 879 int do_all) 880 { 881 const struct net_bridge_vlan *vlan = br_dst_vlan(cleanup_dst); 882 const struct net_bridge_port *p = br_dst_port(cleanup_dst); 883 struct net_bridge_fdb_entry *f; 884 struct hlist_node *tmp; 885 886 spin_lock_bh(&br->hash_lock); 887 hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) { 888 struct net_bridge_dst dst = br_fdb_dst_read(f); 889 890 if (br_dst_port(dst) != p) 891 continue; 892 893 if (vlan && f->key.vlan_id == vlan->vid && 894 test_bit(BR_FDB_LOCAL, &f->flags) && 895 !test_bit(BR_FDB_ADDED_BY_USER, &f->flags) && 896 ether_addr_equal(f->key.addr.addr, p->dev->dev_addr)) { 897 fdb_delete_local(br, p, f); 898 continue; 899 } 900 901 if (!do_all) { 902 if (vid && f->key.vlan_id != vid) 903 continue; 904 905 if (test_bit(BR_FDB_STATIC, &f->flags) || 906 (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags) && 907 !test_bit(BR_FDB_OFFLOADED, &f->flags))) { 908 /* The entry outlives the VLAN, so it must fall 909 * back to the raw port destination 910 */ 911 if (vlan && br_dst_vlan(dst) == vlan) 912 br_fdb_dst_replace(f, dst, 913 br_port_to_dst(p)); 914 continue; 915 } 916 } 917 918 if (test_bit(BR_FDB_LOCAL, &f->flags)) 919 fdb_delete_local(br, p, f); 920 else 921 fdb_delete(br, f, true); 922 } 923 spin_unlock_bh(&br->hash_lock); 924 } 925 926 /* 927 * Fill buffer with forwarding table records in 928 * the API format. 929 */ 930 int br_fdb_fillbuf(struct net_bridge *br, void *buf, 931 unsigned long maxnum, unsigned long skip) 932 { 933 const struct net_bridge_port *dst; 934 struct net_bridge_fdb_entry *f; 935 struct __fdb_entry *fe = buf; 936 unsigned long delta; 937 int num = 0; 938 939 memset(buf, 0, maxnum*sizeof(struct __fdb_entry)); 940 941 rcu_read_lock(); 942 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 943 if (num >= maxnum) 944 break; 945 946 if (has_expired(br, f)) 947 continue; 948 949 /* ignore pseudo entry for local MAC address */ 950 dst = br_fdb_dst_port(f); 951 if (!dst) 952 continue; 953 954 if (skip) { 955 --skip; 956 continue; 957 } 958 959 /* convert from internal format to API */ 960 memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN); 961 962 /* due to ABI compat need to split into hi/lo */ 963 fe->port_no = dst->port_no; 964 fe->port_hi = dst->port_no >> 8; 965 966 fe->is_local = test_bit(BR_FDB_LOCAL, &f->flags); 967 if (!test_bit(BR_FDB_STATIC, &f->flags)) { 968 delta = jiffies - READ_ONCE(f->updated); 969 fe->ageing_timer_value = 970 jiffies_delta_to_clock_t(delta); 971 } 972 ++fe; 973 ++num; 974 } 975 rcu_read_unlock(); 976 977 return num; 978 } 979 980 /* Add entry for local address of interface */ 981 int br_fdb_add_local(struct net_bridge *br, struct net_bridge_port *source, 982 const unsigned char *addr, u16 vid) 983 { 984 int ret; 985 986 spin_lock_bh(&br->hash_lock); 987 ret = fdb_add_local(br, source, addr, vid); 988 spin_unlock_bh(&br->hash_lock); 989 return ret; 990 } 991 992 /* returns true if the fdb was modified */ 993 static bool __fdb_mark_active(struct net_bridge_fdb_entry *fdb) 994 { 995 return !!(test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags) && 996 test_and_clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags)); 997 } 998 999 static void __fdb_update(struct net_bridge *br, 1000 struct net_bridge_fdb_entry *fdb, 1001 struct net_bridge_port *source, 1002 struct net_bridge_dst dst, 1003 unsigned long flags) 1004 { 1005 struct net_bridge_port *old_port; 1006 struct net_bridge_dst old_dst; 1007 bool fdb_modified = false; 1008 unsigned long now; 1009 1010 /* attempt to update an entry for a local interface */ 1011 if (unlikely(test_bit(BR_FDB_LOCAL, &fdb->flags))) { 1012 if (net_ratelimit()) 1013 br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n", 1014 source->dev->name, fdb->key.addr.addr, 1015 fdb->key.vlan_id); 1016 return; 1017 } 1018 1019 now = jiffies; 1020 if (now != READ_ONCE(fdb->updated)) { 1021 WRITE_ONCE(fdb->updated, now); 1022 fdb_modified = __fdb_mark_active(fdb); 1023 } 1024 1025 old_dst = br_fdb_dst_read(fdb); 1026 old_port = br_dst_port(old_dst); 1027 /* fastpath: update of existing entry */ 1028 if (unlikely(!br_dst_equal(dst, old_dst) && 1029 (source == old_port || 1030 !test_bit(BR_FDB_STICKY, &fdb->flags)))) { 1031 if (source != old_port) { 1032 br_switchdev_fdb_notify(br, fdb, RTM_DELNEIGH); 1033 br_fdb_dst_write(fdb, dst); 1034 fdb_modified = true; 1035 /* take over HW learned entry */ 1036 if (unlikely(test_bit(BR_FDB_ADDED_BY_EXT_LEARN, 1037 &fdb->flags))) 1038 clear_bit(BR_FDB_ADDED_BY_EXT_LEARN, 1039 &fdb->flags); 1040 /* clear locked flag when roaming to an unlocked port */ 1041 if (unlikely(test_bit(BR_FDB_LOCKED, &fdb->flags))) 1042 clear_bit(BR_FDB_LOCKED, &fdb->flags); 1043 } else { 1044 /* raw port-to-VLAN promotion shouldn't overwrite a 1045 * concurrent roam to another port 1046 */ 1047 br_fdb_dst_replace(fdb, old_dst, dst); 1048 } 1049 } 1050 1051 if (unlikely(test_bit(BR_FDB_ADDED_BY_USER, &flags))) { 1052 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); 1053 if (test_and_clear_bit(BR_FDB_DYNAMIC_LEARNED, &fdb->flags)) 1054 atomic_dec(&br->fdb_n_learned); 1055 } 1056 1057 if (unlikely(fdb_modified)) { 1058 trace_br_fdb_update(br, source, fdb->key.addr.addr, 1059 fdb->key.vlan_id, flags); 1060 fdb_notify(br, fdb, RTM_NEWNEIGH, true); 1061 } 1062 } 1063 1064 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 1065 struct net_bridge_vlan *vlan, const unsigned char *addr, 1066 unsigned long flags) 1067 { 1068 struct net_bridge_dst dst = vlan ? br_vlan_to_dst(vlan) : 1069 br_port_to_dst(source); 1070 struct net_bridge_fdb_entry *fdb; 1071 u16 vid = vlan ? vlan->vid : 0; 1072 1073 /* some users want to always flood. */ 1074 if (hold_time(br) == 0) 1075 return; 1076 1077 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid); 1078 if (likely(fdb)) { 1079 __fdb_update(br, fdb, source, dst, flags); 1080 } else { 1081 spin_lock(&br->hash_lock); 1082 fdb = fdb_create(br, dst, addr, vid, flags); 1083 if (fdb) { 1084 trace_br_fdb_update(br, source, addr, vid, flags); 1085 fdb_notify(br, fdb, RTM_NEWNEIGH, true); 1086 } 1087 spin_unlock(&br->hash_lock); 1088 } 1089 } 1090 1091 /* Dump information about entries, in response to GETNEIGH */ 1092 int br_fdb_dump(struct sk_buff *skb, 1093 struct netlink_callback *cb, 1094 struct net_device *dev, 1095 struct net_device *filter_dev, 1096 int *idx) 1097 { 1098 struct ndo_fdb_dump_context *ctx = (void *)cb->ctx; 1099 struct net_bridge *br = netdev_priv(dev); 1100 struct net_bridge_fdb_entry *f; 1101 int err = 0; 1102 1103 if (!netif_is_bridge_master(dev)) 1104 return err; 1105 1106 if (!filter_dev) { 1107 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 1108 if (err < 0) 1109 return err; 1110 } 1111 1112 rcu_read_lock(); 1113 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 1114 const struct net_bridge_port *dst = br_fdb_dst_port(f); 1115 1116 if (*idx < ctx->fdb_idx) 1117 goto skip; 1118 if (filter_dev && (!dst || dst->dev != filter_dev)) { 1119 if (filter_dev != dev) 1120 goto skip; 1121 /* A NULL destination is a special case for bridge 1122 * It means the MAC belongs to the bridge 1123 * Therefore need a little more filtering 1124 * we only want to dump the NULL destination case 1125 */ 1126 if (dst) 1127 goto skip; 1128 } 1129 if (!filter_dev && dst) 1130 goto skip; 1131 1132 err = fdb_fill_info(skb, br, f, 1133 NETLINK_CB(cb->skb).portid, 1134 cb->nlh->nlmsg_seq, 1135 RTM_NEWNEIGH, 1136 NLM_F_MULTI); 1137 if (err < 0) 1138 break; 1139 skip: 1140 *idx += 1; 1141 } 1142 rcu_read_unlock(); 1143 1144 return err; 1145 } 1146 1147 int br_fdb_get(struct sk_buff *skb, 1148 struct nlattr *tb[], 1149 struct net_device *dev, 1150 const unsigned char *addr, 1151 u16 vid, u32 portid, u32 seq, 1152 struct netlink_ext_ack *extack) 1153 { 1154 struct net_bridge *br = netdev_priv(dev); 1155 struct net_bridge_fdb_entry *f; 1156 int err = 0; 1157 1158 rcu_read_lock(); 1159 f = br_fdb_find_rcu(br, addr, vid); 1160 if (!f) { 1161 NL_SET_ERR_MSG(extack, "Fdb entry not found"); 1162 err = -ENOENT; 1163 goto errout; 1164 } 1165 1166 err = fdb_fill_info(skb, br, f, portid, seq, 1167 RTM_NEWNEIGH, 0); 1168 errout: 1169 rcu_read_unlock(); 1170 return err; 1171 } 1172 1173 /* returns true if the fdb is modified */ 1174 static bool fdb_handle_notify(struct net_bridge_fdb_entry *fdb, u8 notify) 1175 { 1176 bool modified = false; 1177 1178 /* allow to mark an entry as inactive, usually done on creation */ 1179 if ((notify & FDB_NOTIFY_INACTIVE_BIT) && 1180 !test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags)) 1181 modified = true; 1182 1183 if ((notify & FDB_NOTIFY_BIT) && 1184 !test_and_set_bit(BR_FDB_NOTIFY, &fdb->flags)) { 1185 /* enabled activity tracking */ 1186 modified = true; 1187 } else if (!(notify & FDB_NOTIFY_BIT) && 1188 test_and_clear_bit(BR_FDB_NOTIFY, &fdb->flags)) { 1189 /* disabled activity tracking, clear notify state */ 1190 clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags); 1191 modified = true; 1192 } 1193 1194 return modified; 1195 } 1196 1197 static bool fdb_update_dst(struct net_bridge_fdb_entry *fdb, 1198 struct net_bridge_dst old_dst, 1199 struct net_bridge_dst dst) 1200 { 1201 if (br_dst_equal(old_dst, dst)) 1202 return false; 1203 1204 if (br_dst_port(old_dst) == br_dst_port(dst)) { 1205 br_fdb_dst_replace(fdb, old_dst, dst); 1206 return false; 1207 } 1208 1209 br_fdb_dst_write(fdb, dst); 1210 return true; 1211 } 1212 1213 /* Update (create or replace) forwarding database entry */ 1214 static int fdb_add_entry(struct net_bridge *br, struct net_bridge_dst dst, 1215 const u8 *addr, struct ndmsg *ndm, u16 flags, u16 vid, 1216 struct nlattr *nfea_tb[]) 1217 { 1218 struct net_bridge_port *source = br_dst_port(dst); 1219 bool is_sticky = !!(ndm->ndm_flags & NTF_STICKY); 1220 bool refresh = !nfea_tb[NFEA_DONT_REFRESH]; 1221 struct net_bridge_fdb_entry *fdb; 1222 u16 state = ndm->ndm_state; 1223 bool modified = false; 1224 u8 notify = 0; 1225 1226 /* If the port cannot learn allow only local and static entries */ 1227 if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) && 1228 !(source->state == BR_STATE_LEARNING || 1229 source->state == BR_STATE_FORWARDING)) 1230 return -EPERM; 1231 1232 if (!source && !(state & NUD_PERMANENT)) { 1233 pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n", 1234 br->dev->name); 1235 return -EINVAL; 1236 } 1237 1238 if (is_sticky && (state & NUD_PERMANENT)) 1239 return -EINVAL; 1240 1241 if (nfea_tb[NFEA_ACTIVITY_NOTIFY]) { 1242 notify = nla_get_u8(nfea_tb[NFEA_ACTIVITY_NOTIFY]); 1243 if ((notify & ~BR_FDB_NOTIFY_SETTABLE_BITS) || 1244 (notify & BR_FDB_NOTIFY_SETTABLE_BITS) == FDB_NOTIFY_INACTIVE_BIT) 1245 return -EINVAL; 1246 } 1247 1248 fdb = br_fdb_find(br, addr, vid); 1249 if (fdb == NULL) { 1250 if (!(flags & NLM_F_CREATE)) 1251 return -ENOENT; 1252 1253 fdb = fdb_create(br, dst, addr, vid, 1254 BIT(BR_FDB_ADDED_BY_USER)); 1255 if (!fdb) 1256 return -ENOMEM; 1257 1258 modified = true; 1259 } else { 1260 struct net_bridge_dst old_dst; 1261 1262 if (flags & NLM_F_EXCL) 1263 return -EEXIST; 1264 1265 old_dst = br_fdb_dst_read(fdb); 1266 modified = fdb_update_dst(fdb, old_dst, dst); 1267 1268 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); 1269 if (test_and_clear_bit(BR_FDB_DYNAMIC_LEARNED, &fdb->flags)) 1270 atomic_dec(&br->fdb_n_learned); 1271 } 1272 1273 if (fdb_to_nud(br, fdb) != state) { 1274 if (state & NUD_PERMANENT) { 1275 set_bit(BR_FDB_LOCAL, &fdb->flags); 1276 if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags)) 1277 fdb_add_hw_addr(br, addr); 1278 } else if (state & NUD_NOARP) { 1279 clear_bit(BR_FDB_LOCAL, &fdb->flags); 1280 if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags)) 1281 fdb_add_hw_addr(br, addr); 1282 } else { 1283 clear_bit(BR_FDB_LOCAL, &fdb->flags); 1284 if (test_and_clear_bit(BR_FDB_STATIC, &fdb->flags)) 1285 fdb_del_hw_addr(br, addr); 1286 } 1287 1288 modified = true; 1289 } 1290 1291 if (is_sticky != test_bit(BR_FDB_STICKY, &fdb->flags)) { 1292 change_bit(BR_FDB_STICKY, &fdb->flags); 1293 modified = true; 1294 } 1295 1296 if (test_and_clear_bit(BR_FDB_LOCKED, &fdb->flags)) 1297 modified = true; 1298 1299 if (fdb_handle_notify(fdb, notify)) 1300 modified = true; 1301 1302 WRITE_ONCE(fdb->used, jiffies); 1303 if (modified) { 1304 if (refresh) 1305 WRITE_ONCE(fdb->updated, jiffies); 1306 fdb_notify(br, fdb, RTM_NEWNEIGH, true); 1307 } 1308 1309 return 0; 1310 } 1311 1312 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br, 1313 struct net_bridge_port *p, const unsigned char *addr, 1314 u16 nlh_flags, struct net_bridge_vlan *vlan, 1315 struct nlattr *nfea_tb[], 1316 bool *notified, struct netlink_ext_ack *extack) 1317 { 1318 u16 vid = vlan ? vlan->vid : 0; 1319 struct net_bridge_dst dst; 1320 int err = 0; 1321 1322 if (ndm->ndm_flags & NTF_USE) { 1323 if (!p) { 1324 pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n", 1325 br->dev->name); 1326 return -EINVAL; 1327 } 1328 if (!nbp_state_should_learn(p)) 1329 return 0; 1330 1331 local_bh_disable(); 1332 rcu_read_lock(); 1333 br_fdb_update(br, p, vlan, addr, BIT(BR_FDB_ADDED_BY_USER)); 1334 rcu_read_unlock(); 1335 local_bh_enable(); 1336 } else if (ndm->ndm_flags & NTF_EXT_LEARNED) { 1337 if (!p && !(ndm->ndm_state & NUD_PERMANENT)) { 1338 NL_SET_ERR_MSG_MOD(extack, 1339 "FDB entry towards bridge must be permanent"); 1340 return -EINVAL; 1341 } 1342 err = br_fdb_external_learn_add(br, p, addr, vid, false, true); 1343 } else { 1344 dst = p && vlan ? br_vlan_to_dst(vlan) : br_port_to_dst(p); 1345 spin_lock_bh(&br->hash_lock); 1346 err = fdb_add_entry(br, dst, addr, ndm, nlh_flags, vid, 1347 nfea_tb); 1348 spin_unlock_bh(&br->hash_lock); 1349 } 1350 1351 if (!err) 1352 *notified = true; 1353 return err; 1354 } 1355 1356 static const struct nla_policy br_nda_fdb_pol[NFEA_MAX + 1] = { 1357 [NFEA_ACTIVITY_NOTIFY] = { .type = NLA_U8 }, 1358 [NFEA_DONT_REFRESH] = { .type = NLA_FLAG }, 1359 }; 1360 1361 /* Add new permanent fdb entry with RTM_NEWNEIGH */ 1362 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 1363 struct net_device *dev, 1364 const unsigned char *addr, u16 vid, u16 nlh_flags, 1365 bool *notified, struct netlink_ext_ack *extack) 1366 { 1367 struct nlattr *nfea_tb[NFEA_MAX + 1], *attr; 1368 struct net_bridge_vlan_group *vg; 1369 struct net_bridge_port *p = NULL; 1370 struct net_bridge_vlan *v; 1371 struct net_bridge *br = NULL; 1372 u32 ext_flags = 0; 1373 int err = 0; 1374 1375 trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags); 1376 1377 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) { 1378 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state); 1379 return -EINVAL; 1380 } 1381 1382 if (is_zero_ether_addr(addr)) { 1383 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n"); 1384 return -EINVAL; 1385 } 1386 1387 if (netif_is_bridge_master(dev)) { 1388 br = netdev_priv(dev); 1389 vg = br_vlan_group(br); 1390 } else { 1391 p = br_port_get_rtnl(dev); 1392 if (!p) { 1393 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n", 1394 dev->name); 1395 return -EINVAL; 1396 } 1397 br = p->br; 1398 vg = nbp_vlan_group(p); 1399 } 1400 1401 if (tb[NDA_FLAGS_EXT]) 1402 ext_flags = nla_get_u32(tb[NDA_FLAGS_EXT]); 1403 1404 if (ext_flags & NTF_EXT_LOCKED) { 1405 NL_SET_ERR_MSG_MOD(extack, "Cannot add FDB entry with \"locked\" flag set"); 1406 return -EINVAL; 1407 } 1408 1409 if (tb[NDA_FDB_EXT_ATTRS]) { 1410 attr = tb[NDA_FDB_EXT_ATTRS]; 1411 err = nla_parse_nested(nfea_tb, NFEA_MAX, attr, 1412 br_nda_fdb_pol, extack); 1413 if (err) 1414 return err; 1415 } else { 1416 memset(nfea_tb, 0, sizeof(struct nlattr *) * (NFEA_MAX + 1)); 1417 } 1418 1419 if (vid) { 1420 v = br_vlan_find(vg, vid); 1421 if (!v || !br_vlan_should_use(v)) { 1422 pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name); 1423 return -EINVAL; 1424 } 1425 1426 /* VID was specified, so use it. */ 1427 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v, nfea_tb, 1428 notified, extack); 1429 } else { 1430 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, NULL, nfea_tb, 1431 notified, extack); 1432 if (err || !vg || !vg->num_vlans) 1433 goto out; 1434 1435 /* We have vlans configured on this port and user didn't 1436 * specify a VLAN. To be nice, add/update entry for every 1437 * vlan on this port. 1438 */ 1439 list_for_each_entry(v, &vg->vlan_list, vlist) { 1440 if (!br_vlan_should_use(v)) 1441 continue; 1442 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v, 1443 nfea_tb, notified, extack); 1444 if (err) 1445 goto out; 1446 } 1447 } 1448 1449 out: 1450 return err; 1451 } 1452 1453 static int fdb_delete_by_addr_and_port(struct net_bridge *br, 1454 const struct net_bridge_port *p, 1455 const u8 *addr, u16 vlan, bool *notified) 1456 { 1457 struct net_bridge_fdb_entry *fdb; 1458 1459 fdb = br_fdb_find(br, addr, vlan); 1460 if (!fdb || br_fdb_dst_port(fdb) != p) 1461 return -ENOENT; 1462 1463 fdb_delete(br, fdb, true); 1464 *notified = true; 1465 1466 return 0; 1467 } 1468 1469 static int __br_fdb_delete(struct net_bridge *br, 1470 const struct net_bridge_port *p, 1471 const unsigned char *addr, u16 vid, bool *notified) 1472 { 1473 int err; 1474 1475 spin_lock_bh(&br->hash_lock); 1476 err = fdb_delete_by_addr_and_port(br, p, addr, vid, notified); 1477 spin_unlock_bh(&br->hash_lock); 1478 1479 return err; 1480 } 1481 1482 /* Remove neighbor entry with RTM_DELNEIGH */ 1483 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 1484 struct net_device *dev, 1485 const unsigned char *addr, u16 vid, bool *notified, 1486 struct netlink_ext_ack *extack) 1487 { 1488 struct net_bridge_vlan_group *vg; 1489 struct net_bridge_port *p = NULL; 1490 struct net_bridge *br; 1491 int err; 1492 1493 if (netif_is_bridge_master(dev)) { 1494 br = netdev_priv(dev); 1495 vg = br_vlan_group(br); 1496 } else { 1497 p = br_port_get_rtnl(dev); 1498 if (!p) { 1499 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n", 1500 dev->name); 1501 return -EINVAL; 1502 } 1503 vg = nbp_vlan_group(p); 1504 br = p->br; 1505 } 1506 1507 if (vid) { 1508 err = __br_fdb_delete(br, p, addr, vid, notified); 1509 } else { 1510 struct net_bridge_vlan *v; 1511 1512 err = -ENOENT; 1513 err &= __br_fdb_delete(br, p, addr, 0, notified); 1514 if (!vg || !vg->num_vlans) 1515 return err; 1516 1517 list_for_each_entry(v, &vg->vlan_list, vlist) { 1518 if (!br_vlan_should_use(v)) 1519 continue; 1520 err &= __br_fdb_delete(br, p, addr, v->vid, notified); 1521 } 1522 } 1523 1524 return err; 1525 } 1526 1527 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p) 1528 { 1529 struct net_bridge_fdb_entry *f, *tmp; 1530 int err = 0; 1531 1532 ASSERT_RTNL(); 1533 1534 /* the key here is that static entries change only under rtnl */ 1535 rcu_read_lock(); 1536 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 1537 /* We only care for static entries */ 1538 if (!test_bit(BR_FDB_STATIC, &f->flags)) 1539 continue; 1540 err = dev_uc_add(p->dev, f->key.addr.addr); 1541 if (err) 1542 goto rollback; 1543 } 1544 done: 1545 rcu_read_unlock(); 1546 1547 return err; 1548 1549 rollback: 1550 hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) { 1551 /* We only care for static entries */ 1552 if (!test_bit(BR_FDB_STATIC, &tmp->flags)) 1553 continue; 1554 if (tmp == f) 1555 break; 1556 dev_uc_del(p->dev, tmp->key.addr.addr); 1557 } 1558 1559 goto done; 1560 } 1561 1562 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p) 1563 { 1564 struct net_bridge_fdb_entry *f; 1565 1566 ASSERT_RTNL(); 1567 1568 rcu_read_lock(); 1569 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 1570 /* We only care for static entries */ 1571 if (!test_bit(BR_FDB_STATIC, &f->flags)) 1572 continue; 1573 1574 dev_uc_del(p->dev, f->key.addr.addr); 1575 } 1576 rcu_read_unlock(); 1577 } 1578 1579 static struct net_bridge_dst br_fdb_resolve_dst(const struct net_bridge_port *p, 1580 u16 vid) 1581 { 1582 struct net_bridge_dst dst = br_port_to_dst(p); 1583 struct net_bridge_vlan *v; 1584 1585 lockdep_assert(rcu_read_lock_held() || lockdep_rtnl_is_held()); 1586 1587 if (!p || !vid) 1588 return dst; 1589 1590 rcu_read_lock(); 1591 v = br_vlan_find(nbp_vlan_group_rcu(p), vid); 1592 if (v) 1593 dst = br_vlan_to_dst(v); 1594 rcu_read_unlock(); 1595 1596 return dst; 1597 } 1598 1599 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 1600 const unsigned char *addr, u16 vid, bool locked, 1601 bool swdev_notify) 1602 { 1603 struct net_bridge_dst dst = br_fdb_resolve_dst(p, vid); 1604 struct net_bridge_fdb_entry *fdb; 1605 bool modified = false; 1606 int err = 0; 1607 1608 trace_br_fdb_external_learn_add(br, p, addr, vid); 1609 1610 if (locked && (!p || !test_bit(BR_PORT_MAB_BIT, &p->flags))) 1611 return -EINVAL; 1612 1613 spin_lock_bh(&br->hash_lock); 1614 1615 fdb = br_fdb_find(br, addr, vid); 1616 if (!fdb) { 1617 unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN); 1618 1619 if (swdev_notify) 1620 flags |= BIT(BR_FDB_ADDED_BY_USER); 1621 1622 if (!p) 1623 flags |= BIT(BR_FDB_LOCAL); 1624 1625 if (locked) 1626 flags |= BIT(BR_FDB_LOCKED); 1627 1628 fdb = fdb_create(br, dst, addr, vid, flags); 1629 if (!fdb) { 1630 err = -ENOMEM; 1631 goto err_unlock; 1632 } 1633 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify); 1634 } else { 1635 struct net_bridge_dst old_dst; 1636 1637 old_dst = br_fdb_dst_read(fdb); 1638 if (locked && 1639 (!test_bit(BR_FDB_LOCKED, &fdb->flags) || 1640 br_dst_port(old_dst) != p)) { 1641 err = -EINVAL; 1642 goto err_unlock; 1643 } 1644 1645 WRITE_ONCE(fdb->updated, jiffies); 1646 1647 modified = fdb_update_dst(fdb, old_dst, dst); 1648 1649 if (test_and_set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) { 1650 /* Refresh entry */ 1651 WRITE_ONCE(fdb->used, jiffies); 1652 } else { 1653 modified = true; 1654 } 1655 1656 if (locked != test_bit(BR_FDB_LOCKED, &fdb->flags)) { 1657 change_bit(BR_FDB_LOCKED, &fdb->flags); 1658 modified = true; 1659 } 1660 1661 if (swdev_notify) 1662 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); 1663 1664 if (!p) 1665 set_bit(BR_FDB_LOCAL, &fdb->flags); 1666 1667 if ((swdev_notify || !p) && 1668 test_and_clear_bit(BR_FDB_DYNAMIC_LEARNED, &fdb->flags)) 1669 atomic_dec(&br->fdb_n_learned); 1670 1671 if (modified) 1672 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify); 1673 } 1674 1675 err_unlock: 1676 spin_unlock_bh(&br->hash_lock); 1677 1678 return err; 1679 } 1680 1681 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 1682 const unsigned char *addr, u16 vid, 1683 bool swdev_notify) 1684 { 1685 struct net_bridge_fdb_entry *fdb; 1686 int err = 0; 1687 1688 spin_lock_bh(&br->hash_lock); 1689 1690 fdb = br_fdb_find(br, addr, vid); 1691 if (fdb && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) 1692 fdb_delete(br, fdb, swdev_notify); 1693 else 1694 err = -ENOENT; 1695 1696 spin_unlock_bh(&br->hash_lock); 1697 1698 return err; 1699 } 1700 1701 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 1702 const unsigned char *addr, u16 vid, bool offloaded) 1703 { 1704 struct net_bridge_fdb_entry *fdb; 1705 1706 spin_lock_bh(&br->hash_lock); 1707 1708 fdb = br_fdb_find(br, addr, vid); 1709 if (fdb && offloaded != test_bit(BR_FDB_OFFLOADED, &fdb->flags)) 1710 change_bit(BR_FDB_OFFLOADED, &fdb->flags); 1711 1712 spin_unlock_bh(&br->hash_lock); 1713 } 1714 1715 void br_fdb_clear_offload(const struct net_device *dev, u16 vid) 1716 { 1717 struct net_bridge_fdb_entry *f; 1718 struct net_bridge_port *p; 1719 1720 ASSERT_RTNL(); 1721 1722 p = br_port_get_rtnl(dev); 1723 if (!p) 1724 return; 1725 1726 spin_lock_bh(&p->br->hash_lock); 1727 hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) { 1728 if (br_fdb_dst_port(f) == p && f->key.vlan_id == vid) 1729 clear_bit(BR_FDB_OFFLOADED, &f->flags); 1730 } 1731 spin_unlock_bh(&p->br->hash_lock); 1732 } 1733 EXPORT_SYMBOL_GPL(br_fdb_clear_offload); 1734