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