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 = 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 - 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 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 = READ_ONCE(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 unsigned long delta; 928 int num = 0; 929 930 memset(buf, 0, maxnum*sizeof(struct __fdb_entry)); 931 932 rcu_read_lock(); 933 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 934 if (num >= maxnum) 935 break; 936 937 if (has_expired(br, f)) 938 continue; 939 940 /* ignore pseudo entry for local MAC address */ 941 if (!f->dst) 942 continue; 943 944 if (skip) { 945 --skip; 946 continue; 947 } 948 949 /* convert from internal format to API */ 950 memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN); 951 952 /* due to ABI compat need to split into hi/lo */ 953 fe->port_no = f->dst->port_no; 954 fe->port_hi = f->dst->port_no >> 8; 955 956 fe->is_local = test_bit(BR_FDB_LOCAL, &f->flags); 957 if (!test_bit(BR_FDB_STATIC, &f->flags)) { 958 delta = jiffies - READ_ONCE(f->updated); 959 fe->ageing_timer_value = 960 jiffies_delta_to_clock_t(delta); 961 } 962 ++fe; 963 ++num; 964 } 965 rcu_read_unlock(); 966 967 return num; 968 } 969 970 /* Add entry for local address of interface */ 971 int br_fdb_add_local(struct net_bridge *br, struct net_bridge_port *source, 972 const unsigned char *addr, u16 vid) 973 { 974 int ret; 975 976 spin_lock_bh(&br->hash_lock); 977 ret = fdb_add_local(br, source, addr, vid); 978 spin_unlock_bh(&br->hash_lock); 979 return ret; 980 } 981 982 /* returns true if the fdb was modified */ 983 static bool __fdb_mark_active(struct net_bridge_fdb_entry *fdb) 984 { 985 return !!(test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags) && 986 test_and_clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags)); 987 } 988 989 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 990 const unsigned char *addr, u16 vid, unsigned long flags) 991 { 992 struct net_bridge_fdb_entry *fdb; 993 994 /* some users want to always flood. */ 995 if (hold_time(br) == 0) 996 return; 997 998 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid); 999 if (likely(fdb)) { 1000 /* attempt to update an entry for a local interface */ 1001 if (unlikely(test_bit(BR_FDB_LOCAL, &fdb->flags))) { 1002 if (net_ratelimit()) 1003 br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n", 1004 source->dev->name, addr, vid); 1005 } else { 1006 unsigned long now = jiffies; 1007 bool fdb_modified = false; 1008 1009 if (now != READ_ONCE(fdb->updated)) { 1010 WRITE_ONCE(fdb->updated, now); 1011 fdb_modified = __fdb_mark_active(fdb); 1012 } 1013 1014 /* fastpath: update of existing entry */ 1015 if (unlikely(source != READ_ONCE(fdb->dst) && 1016 !test_bit(BR_FDB_STICKY, &fdb->flags))) { 1017 br_switchdev_fdb_notify(br, fdb, RTM_DELNEIGH); 1018 WRITE_ONCE(fdb->dst, source); 1019 fdb_modified = true; 1020 /* Take over HW learned entry */ 1021 if (unlikely(test_bit(BR_FDB_ADDED_BY_EXT_LEARN, 1022 &fdb->flags))) 1023 clear_bit(BR_FDB_ADDED_BY_EXT_LEARN, 1024 &fdb->flags); 1025 /* Clear locked flag when roaming to an 1026 * unlocked port. 1027 */ 1028 if (unlikely(test_bit(BR_FDB_LOCKED, &fdb->flags))) 1029 clear_bit(BR_FDB_LOCKED, &fdb->flags); 1030 } 1031 1032 if (unlikely(test_bit(BR_FDB_ADDED_BY_USER, &flags))) { 1033 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); 1034 if (test_and_clear_bit(BR_FDB_DYNAMIC_LEARNED, 1035 &fdb->flags)) 1036 atomic_dec(&br->fdb_n_learned); 1037 } 1038 if (unlikely(fdb_modified)) { 1039 trace_br_fdb_update(br, source, addr, vid, flags); 1040 fdb_notify(br, fdb, RTM_NEWNEIGH, true); 1041 } 1042 } 1043 } else { 1044 spin_lock(&br->hash_lock); 1045 fdb = fdb_create(br, source, addr, vid, flags); 1046 if (fdb) { 1047 trace_br_fdb_update(br, source, addr, vid, flags); 1048 fdb_notify(br, fdb, RTM_NEWNEIGH, true); 1049 } 1050 /* else we lose race and someone else inserts 1051 * it first, don't bother updating 1052 */ 1053 spin_unlock(&br->hash_lock); 1054 } 1055 } 1056 1057 /* Dump information about entries, in response to GETNEIGH */ 1058 int br_fdb_dump(struct sk_buff *skb, 1059 struct netlink_callback *cb, 1060 struct net_device *dev, 1061 struct net_device *filter_dev, 1062 int *idx) 1063 { 1064 struct ndo_fdb_dump_context *ctx = (void *)cb->ctx; 1065 struct net_bridge *br = netdev_priv(dev); 1066 struct net_bridge_fdb_entry *f; 1067 int err = 0; 1068 1069 if (!netif_is_bridge_master(dev)) 1070 return err; 1071 1072 if (!filter_dev) { 1073 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 1074 if (err < 0) 1075 return err; 1076 } 1077 1078 rcu_read_lock(); 1079 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 1080 if (*idx < ctx->fdb_idx) 1081 goto skip; 1082 if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) { 1083 if (filter_dev != dev) 1084 goto skip; 1085 /* !f->dst is a special case for bridge 1086 * It means the MAC belongs to the bridge 1087 * Therefore need a little more filtering 1088 * we only want to dump the !f->dst case 1089 */ 1090 if (f->dst) 1091 goto skip; 1092 } 1093 if (!filter_dev && f->dst) 1094 goto skip; 1095 1096 err = fdb_fill_info(skb, br, f, 1097 NETLINK_CB(cb->skb).portid, 1098 cb->nlh->nlmsg_seq, 1099 RTM_NEWNEIGH, 1100 NLM_F_MULTI); 1101 if (err < 0) 1102 break; 1103 skip: 1104 *idx += 1; 1105 } 1106 rcu_read_unlock(); 1107 1108 return err; 1109 } 1110 1111 int br_fdb_get(struct sk_buff *skb, 1112 struct nlattr *tb[], 1113 struct net_device *dev, 1114 const unsigned char *addr, 1115 u16 vid, u32 portid, u32 seq, 1116 struct netlink_ext_ack *extack) 1117 { 1118 struct net_bridge *br = netdev_priv(dev); 1119 struct net_bridge_fdb_entry *f; 1120 int err = 0; 1121 1122 rcu_read_lock(); 1123 f = br_fdb_find_rcu(br, addr, vid); 1124 if (!f) { 1125 NL_SET_ERR_MSG(extack, "Fdb entry not found"); 1126 err = -ENOENT; 1127 goto errout; 1128 } 1129 1130 err = fdb_fill_info(skb, br, f, portid, seq, 1131 RTM_NEWNEIGH, 0); 1132 errout: 1133 rcu_read_unlock(); 1134 return err; 1135 } 1136 1137 /* returns true if the fdb is modified */ 1138 static bool fdb_handle_notify(struct net_bridge_fdb_entry *fdb, u8 notify) 1139 { 1140 bool modified = false; 1141 1142 /* allow to mark an entry as inactive, usually done on creation */ 1143 if ((notify & FDB_NOTIFY_INACTIVE_BIT) && 1144 !test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags)) 1145 modified = true; 1146 1147 if ((notify & FDB_NOTIFY_BIT) && 1148 !test_and_set_bit(BR_FDB_NOTIFY, &fdb->flags)) { 1149 /* enabled activity tracking */ 1150 modified = true; 1151 } else if (!(notify & FDB_NOTIFY_BIT) && 1152 test_and_clear_bit(BR_FDB_NOTIFY, &fdb->flags)) { 1153 /* disabled activity tracking, clear notify state */ 1154 clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags); 1155 modified = true; 1156 } 1157 1158 return modified; 1159 } 1160 1161 /* Update (create or replace) forwarding database entry */ 1162 static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source, 1163 const u8 *addr, struct ndmsg *ndm, u16 flags, u16 vid, 1164 struct nlattr *nfea_tb[]) 1165 { 1166 bool is_sticky = !!(ndm->ndm_flags & NTF_STICKY); 1167 bool refresh = !nfea_tb[NFEA_DONT_REFRESH]; 1168 struct net_bridge_fdb_entry *fdb; 1169 u16 state = ndm->ndm_state; 1170 bool modified = false; 1171 u8 notify = 0; 1172 1173 /* If the port cannot learn allow only local and static entries */ 1174 if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) && 1175 !(source->state == BR_STATE_LEARNING || 1176 source->state == BR_STATE_FORWARDING)) 1177 return -EPERM; 1178 1179 if (!source && !(state & NUD_PERMANENT)) { 1180 pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n", 1181 br->dev->name); 1182 return -EINVAL; 1183 } 1184 1185 if (is_sticky && (state & NUD_PERMANENT)) 1186 return -EINVAL; 1187 1188 if (nfea_tb[NFEA_ACTIVITY_NOTIFY]) { 1189 notify = nla_get_u8(nfea_tb[NFEA_ACTIVITY_NOTIFY]); 1190 if ((notify & ~BR_FDB_NOTIFY_SETTABLE_BITS) || 1191 (notify & BR_FDB_NOTIFY_SETTABLE_BITS) == FDB_NOTIFY_INACTIVE_BIT) 1192 return -EINVAL; 1193 } 1194 1195 fdb = br_fdb_find(br, addr, vid); 1196 if (fdb == NULL) { 1197 if (!(flags & NLM_F_CREATE)) 1198 return -ENOENT; 1199 1200 fdb = fdb_create(br, source, addr, vid, 1201 BIT(BR_FDB_ADDED_BY_USER)); 1202 if (!fdb) 1203 return -ENOMEM; 1204 1205 modified = true; 1206 } else { 1207 if (flags & NLM_F_EXCL) 1208 return -EEXIST; 1209 1210 if (READ_ONCE(fdb->dst) != source) { 1211 WRITE_ONCE(fdb->dst, source); 1212 modified = true; 1213 } 1214 1215 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); 1216 if (test_and_clear_bit(BR_FDB_DYNAMIC_LEARNED, &fdb->flags)) 1217 atomic_dec(&br->fdb_n_learned); 1218 } 1219 1220 if (fdb_to_nud(br, fdb) != state) { 1221 if (state & NUD_PERMANENT) { 1222 set_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 if (state & NUD_NOARP) { 1226 clear_bit(BR_FDB_LOCAL, &fdb->flags); 1227 if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags)) 1228 fdb_add_hw_addr(br, addr); 1229 } else { 1230 clear_bit(BR_FDB_LOCAL, &fdb->flags); 1231 if (test_and_clear_bit(BR_FDB_STATIC, &fdb->flags)) 1232 fdb_del_hw_addr(br, addr); 1233 } 1234 1235 modified = true; 1236 } 1237 1238 if (is_sticky != test_bit(BR_FDB_STICKY, &fdb->flags)) { 1239 change_bit(BR_FDB_STICKY, &fdb->flags); 1240 modified = true; 1241 } 1242 1243 if (test_and_clear_bit(BR_FDB_LOCKED, &fdb->flags)) 1244 modified = true; 1245 1246 if (fdb_handle_notify(fdb, notify)) 1247 modified = true; 1248 1249 WRITE_ONCE(fdb->used, jiffies); 1250 if (modified) { 1251 if (refresh) 1252 WRITE_ONCE(fdb->updated, jiffies); 1253 fdb_notify(br, fdb, RTM_NEWNEIGH, true); 1254 } 1255 1256 return 0; 1257 } 1258 1259 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br, 1260 struct net_bridge_port *p, const unsigned char *addr, 1261 u16 nlh_flags, u16 vid, struct nlattr *nfea_tb[], 1262 bool *notified, struct netlink_ext_ack *extack) 1263 { 1264 int err = 0; 1265 1266 if (ndm->ndm_flags & NTF_USE) { 1267 if (!p) { 1268 pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n", 1269 br->dev->name); 1270 return -EINVAL; 1271 } 1272 if (!nbp_state_should_learn(p)) 1273 return 0; 1274 1275 local_bh_disable(); 1276 rcu_read_lock(); 1277 br_fdb_update(br, p, addr, vid, BIT(BR_FDB_ADDED_BY_USER)); 1278 rcu_read_unlock(); 1279 local_bh_enable(); 1280 } else if (ndm->ndm_flags & NTF_EXT_LEARNED) { 1281 if (!p && !(ndm->ndm_state & NUD_PERMANENT)) { 1282 NL_SET_ERR_MSG_MOD(extack, 1283 "FDB entry towards bridge must be permanent"); 1284 return -EINVAL; 1285 } 1286 err = br_fdb_external_learn_add(br, p, addr, vid, false, true); 1287 } else { 1288 spin_lock_bh(&br->hash_lock); 1289 err = fdb_add_entry(br, p, addr, ndm, nlh_flags, vid, nfea_tb); 1290 spin_unlock_bh(&br->hash_lock); 1291 } 1292 1293 if (!err) 1294 *notified = true; 1295 return err; 1296 } 1297 1298 static const struct nla_policy br_nda_fdb_pol[NFEA_MAX + 1] = { 1299 [NFEA_ACTIVITY_NOTIFY] = { .type = NLA_U8 }, 1300 [NFEA_DONT_REFRESH] = { .type = NLA_FLAG }, 1301 }; 1302 1303 /* Add new permanent fdb entry with RTM_NEWNEIGH */ 1304 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 1305 struct net_device *dev, 1306 const unsigned char *addr, u16 vid, u16 nlh_flags, 1307 bool *notified, struct netlink_ext_ack *extack) 1308 { 1309 struct nlattr *nfea_tb[NFEA_MAX + 1], *attr; 1310 struct net_bridge_vlan_group *vg; 1311 struct net_bridge_port *p = NULL; 1312 struct net_bridge_vlan *v; 1313 struct net_bridge *br = NULL; 1314 u32 ext_flags = 0; 1315 int err = 0; 1316 1317 trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags); 1318 1319 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) { 1320 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state); 1321 return -EINVAL; 1322 } 1323 1324 if (is_zero_ether_addr(addr)) { 1325 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n"); 1326 return -EINVAL; 1327 } 1328 1329 if (netif_is_bridge_master(dev)) { 1330 br = netdev_priv(dev); 1331 vg = br_vlan_group(br); 1332 } else { 1333 p = br_port_get_rtnl(dev); 1334 if (!p) { 1335 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n", 1336 dev->name); 1337 return -EINVAL; 1338 } 1339 br = p->br; 1340 vg = nbp_vlan_group(p); 1341 } 1342 1343 if (tb[NDA_FLAGS_EXT]) 1344 ext_flags = nla_get_u32(tb[NDA_FLAGS_EXT]); 1345 1346 if (ext_flags & NTF_EXT_LOCKED) { 1347 NL_SET_ERR_MSG_MOD(extack, "Cannot add FDB entry with \"locked\" flag set"); 1348 return -EINVAL; 1349 } 1350 1351 if (tb[NDA_FDB_EXT_ATTRS]) { 1352 attr = tb[NDA_FDB_EXT_ATTRS]; 1353 err = nla_parse_nested(nfea_tb, NFEA_MAX, attr, 1354 br_nda_fdb_pol, extack); 1355 if (err) 1356 return err; 1357 } else { 1358 memset(nfea_tb, 0, sizeof(struct nlattr *) * (NFEA_MAX + 1)); 1359 } 1360 1361 if (vid) { 1362 v = br_vlan_find(vg, vid); 1363 if (!v || !br_vlan_should_use(v)) { 1364 pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name); 1365 return -EINVAL; 1366 } 1367 1368 /* VID was specified, so use it. */ 1369 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid, nfea_tb, 1370 notified, extack); 1371 } else { 1372 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0, nfea_tb, 1373 notified, extack); 1374 if (err || !vg || !vg->num_vlans) 1375 goto out; 1376 1377 /* We have vlans configured on this port and user didn't 1378 * specify a VLAN. To be nice, add/update entry for every 1379 * vlan on this port. 1380 */ 1381 list_for_each_entry(v, &vg->vlan_list, vlist) { 1382 if (!br_vlan_should_use(v)) 1383 continue; 1384 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid, 1385 nfea_tb, notified, extack); 1386 if (err) 1387 goto out; 1388 } 1389 } 1390 1391 out: 1392 return err; 1393 } 1394 1395 static int fdb_delete_by_addr_and_port(struct net_bridge *br, 1396 const struct net_bridge_port *p, 1397 const u8 *addr, u16 vlan, bool *notified) 1398 { 1399 struct net_bridge_fdb_entry *fdb; 1400 1401 fdb = br_fdb_find(br, addr, vlan); 1402 if (!fdb || READ_ONCE(fdb->dst) != p) 1403 return -ENOENT; 1404 1405 fdb_delete(br, fdb, true); 1406 *notified = true; 1407 1408 return 0; 1409 } 1410 1411 static int __br_fdb_delete(struct net_bridge *br, 1412 const struct net_bridge_port *p, 1413 const unsigned char *addr, u16 vid, bool *notified) 1414 { 1415 int err; 1416 1417 spin_lock_bh(&br->hash_lock); 1418 err = fdb_delete_by_addr_and_port(br, p, addr, vid, notified); 1419 spin_unlock_bh(&br->hash_lock); 1420 1421 return err; 1422 } 1423 1424 /* Remove neighbor entry with RTM_DELNEIGH */ 1425 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 1426 struct net_device *dev, 1427 const unsigned char *addr, u16 vid, bool *notified, 1428 struct netlink_ext_ack *extack) 1429 { 1430 struct net_bridge_vlan_group *vg; 1431 struct net_bridge_port *p = NULL; 1432 struct net_bridge *br; 1433 int err; 1434 1435 if (netif_is_bridge_master(dev)) { 1436 br = netdev_priv(dev); 1437 vg = br_vlan_group(br); 1438 } else { 1439 p = br_port_get_rtnl(dev); 1440 if (!p) { 1441 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n", 1442 dev->name); 1443 return -EINVAL; 1444 } 1445 vg = nbp_vlan_group(p); 1446 br = p->br; 1447 } 1448 1449 if (vid) { 1450 err = __br_fdb_delete(br, p, addr, vid, notified); 1451 } else { 1452 struct net_bridge_vlan *v; 1453 1454 err = -ENOENT; 1455 err &= __br_fdb_delete(br, p, addr, 0, notified); 1456 if (!vg || !vg->num_vlans) 1457 return err; 1458 1459 list_for_each_entry(v, &vg->vlan_list, vlist) { 1460 if (!br_vlan_should_use(v)) 1461 continue; 1462 err &= __br_fdb_delete(br, p, addr, v->vid, notified); 1463 } 1464 } 1465 1466 return err; 1467 } 1468 1469 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p) 1470 { 1471 struct net_bridge_fdb_entry *f, *tmp; 1472 int err = 0; 1473 1474 ASSERT_RTNL(); 1475 1476 /* the key here is that static entries change only under rtnl */ 1477 rcu_read_lock(); 1478 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 1479 /* We only care for static entries */ 1480 if (!test_bit(BR_FDB_STATIC, &f->flags)) 1481 continue; 1482 err = dev_uc_add(p->dev, f->key.addr.addr); 1483 if (err) 1484 goto rollback; 1485 } 1486 done: 1487 rcu_read_unlock(); 1488 1489 return err; 1490 1491 rollback: 1492 hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) { 1493 /* We only care for static entries */ 1494 if (!test_bit(BR_FDB_STATIC, &tmp->flags)) 1495 continue; 1496 if (tmp == f) 1497 break; 1498 dev_uc_del(p->dev, tmp->key.addr.addr); 1499 } 1500 1501 goto done; 1502 } 1503 1504 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p) 1505 { 1506 struct net_bridge_fdb_entry *f; 1507 1508 ASSERT_RTNL(); 1509 1510 rcu_read_lock(); 1511 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 1512 /* We only care for static entries */ 1513 if (!test_bit(BR_FDB_STATIC, &f->flags)) 1514 continue; 1515 1516 dev_uc_del(p->dev, f->key.addr.addr); 1517 } 1518 rcu_read_unlock(); 1519 } 1520 1521 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 1522 const unsigned char *addr, u16 vid, bool locked, 1523 bool swdev_notify) 1524 { 1525 struct net_bridge_fdb_entry *fdb; 1526 bool modified = false; 1527 int err = 0; 1528 1529 trace_br_fdb_external_learn_add(br, p, addr, vid); 1530 1531 if (locked && (!p || !(p->flags & BR_PORT_MAB))) 1532 return -EINVAL; 1533 1534 spin_lock_bh(&br->hash_lock); 1535 1536 fdb = br_fdb_find(br, addr, vid); 1537 if (!fdb) { 1538 unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN); 1539 1540 if (swdev_notify) 1541 flags |= BIT(BR_FDB_ADDED_BY_USER); 1542 1543 if (!p) 1544 flags |= BIT(BR_FDB_LOCAL); 1545 1546 if (locked) 1547 flags |= BIT(BR_FDB_LOCKED); 1548 1549 fdb = fdb_create(br, p, addr, vid, flags); 1550 if (!fdb) { 1551 err = -ENOMEM; 1552 goto err_unlock; 1553 } 1554 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify); 1555 } else { 1556 if (locked && 1557 (!test_bit(BR_FDB_LOCKED, &fdb->flags) || 1558 READ_ONCE(fdb->dst) != p)) { 1559 err = -EINVAL; 1560 goto err_unlock; 1561 } 1562 1563 WRITE_ONCE(fdb->updated, jiffies); 1564 1565 if (READ_ONCE(fdb->dst) != p) { 1566 WRITE_ONCE(fdb->dst, p); 1567 modified = true; 1568 } 1569 1570 if (test_and_set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) { 1571 /* Refresh entry */ 1572 WRITE_ONCE(fdb->used, jiffies); 1573 } else { 1574 modified = true; 1575 } 1576 1577 if (locked != test_bit(BR_FDB_LOCKED, &fdb->flags)) { 1578 change_bit(BR_FDB_LOCKED, &fdb->flags); 1579 modified = true; 1580 } 1581 1582 if (swdev_notify) 1583 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); 1584 1585 if (!p) 1586 set_bit(BR_FDB_LOCAL, &fdb->flags); 1587 1588 if ((swdev_notify || !p) && 1589 test_and_clear_bit(BR_FDB_DYNAMIC_LEARNED, &fdb->flags)) 1590 atomic_dec(&br->fdb_n_learned); 1591 1592 if (modified) 1593 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify); 1594 } 1595 1596 err_unlock: 1597 spin_unlock_bh(&br->hash_lock); 1598 1599 return err; 1600 } 1601 1602 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 1603 const unsigned char *addr, u16 vid, 1604 bool swdev_notify) 1605 { 1606 struct net_bridge_fdb_entry *fdb; 1607 int err = 0; 1608 1609 spin_lock_bh(&br->hash_lock); 1610 1611 fdb = br_fdb_find(br, addr, vid); 1612 if (fdb && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) 1613 fdb_delete(br, fdb, swdev_notify); 1614 else 1615 err = -ENOENT; 1616 1617 spin_unlock_bh(&br->hash_lock); 1618 1619 return err; 1620 } 1621 1622 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 1623 const unsigned char *addr, u16 vid, bool offloaded) 1624 { 1625 struct net_bridge_fdb_entry *fdb; 1626 1627 spin_lock_bh(&br->hash_lock); 1628 1629 fdb = br_fdb_find(br, addr, vid); 1630 if (fdb && offloaded != test_bit(BR_FDB_OFFLOADED, &fdb->flags)) 1631 change_bit(BR_FDB_OFFLOADED, &fdb->flags); 1632 1633 spin_unlock_bh(&br->hash_lock); 1634 } 1635 1636 void br_fdb_clear_offload(const struct net_device *dev, u16 vid) 1637 { 1638 struct net_bridge_fdb_entry *f; 1639 struct net_bridge_port *p; 1640 1641 ASSERT_RTNL(); 1642 1643 p = br_port_get_rtnl(dev); 1644 if (!p) 1645 return; 1646 1647 spin_lock_bh(&p->br->hash_lock); 1648 hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) { 1649 if (f->dst == p && f->key.vlan_id == vid) 1650 clear_bit(BR_FDB_OFFLOADED, &f->flags); 1651 } 1652 spin_unlock_bh(&p->br->hash_lock); 1653 } 1654 EXPORT_SYMBOL_GPL(br_fdb_clear_offload); 1655