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 if (!vg) 601 return; 602 603 list_for_each_entry(v, &vg->vlan_list, vlist) 604 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid); 605 } 606 607 static void br_fdb_delete_locals_per_vlan(struct net_bridge *br) 608 { 609 struct net_bridge_port *p; 610 611 ASSERT_RTNL(); 612 613 list_for_each_entry(p, &br->port_list, list) 614 br_fdb_delete_locals_per_vlan_port(br, p); 615 616 br_fdb_delete_locals_per_vlan_port(br, NULL); 617 } 618 619 static int br_fdb_insert_locals_per_vlan_port(struct net_bridge *br, 620 struct net_bridge_port *p, 621 struct netlink_ext_ack *extack) 622 { 623 struct net_bridge_vlan_group *vg; 624 struct net_bridge_vlan *v; 625 struct net_device *dev; 626 int err; 627 628 if (p) { 629 vg = nbp_vlan_group(p); 630 dev = p->dev; 631 } else { 632 vg = br_vlan_group(br); 633 dev = br->dev; 634 } 635 636 if (!vg) 637 return 0; 638 639 list_for_each_entry(v, &vg->vlan_list, vlist) { 640 if (!br_vlan_should_use(v)) 641 continue; 642 643 err = br_fdb_add_local(br, p, dev->dev_addr, v->vid); 644 if (err) 645 return err; 646 } 647 648 return 0; 649 } 650 651 static int br_fdb_insert_locals_per_vlan(struct net_bridge *br, 652 struct netlink_ext_ack *extack) 653 { 654 struct net_bridge_port *p; 655 int err; 656 657 ASSERT_RTNL(); 658 659 list_for_each_entry(p, &br->port_list, list) { 660 err = br_fdb_insert_locals_per_vlan_port(br, p, extack); 661 if (err) 662 goto rollback; 663 } 664 665 err = br_fdb_insert_locals_per_vlan_port(br, NULL, extack); 666 if (err) 667 goto rollback; 668 669 return 0; 670 671 rollback: 672 NL_SET_ERR_MSG_MOD(extack, "fdb_local_vlan_0 toggle: FDB entry insertion failed"); 673 br_fdb_delete_locals_per_vlan(br); 674 return err; 675 } 676 677 int br_fdb_toggle_local_vlan_0(struct net_bridge *br, bool on, 678 struct netlink_ext_ack *extack) 679 { 680 if (!on) 681 return br_fdb_insert_locals_per_vlan(br, extack); 682 683 br_fdb_delete_locals_per_vlan(br); 684 return 0; 685 } 686 687 static bool __fdb_flush_matches(const struct net_bridge *br, 688 const struct net_bridge_fdb_entry *f, 689 const struct net_bridge_fdb_flush_desc *desc) 690 { 691 const struct net_bridge_port *dst = READ_ONCE(f->dst); 692 int port_ifidx = dst ? dst->dev->ifindex : br->dev->ifindex; 693 694 if (desc->vlan_id && desc->vlan_id != f->key.vlan_id) 695 return false; 696 if (desc->port_ifindex && desc->port_ifindex != port_ifidx) 697 return false; 698 if (desc->flags_mask && (f->flags & desc->flags_mask) != desc->flags) 699 return false; 700 701 return true; 702 } 703 704 /* Flush forwarding database entries matching the description */ 705 void br_fdb_flush(struct net_bridge *br, 706 const struct net_bridge_fdb_flush_desc *desc) 707 { 708 struct net_bridge_fdb_entry *f; 709 710 rcu_read_lock(); 711 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 712 if (!__fdb_flush_matches(br, f, desc)) 713 continue; 714 715 spin_lock_bh(&br->hash_lock); 716 if (!hlist_unhashed(&f->fdb_node)) 717 fdb_delete(br, f, true); 718 spin_unlock_bh(&br->hash_lock); 719 } 720 rcu_read_unlock(); 721 } 722 723 static unsigned long __ndm_state_to_fdb_flags(u16 ndm_state) 724 { 725 unsigned long flags = 0; 726 727 if (ndm_state & NUD_PERMANENT) 728 __set_bit(BR_FDB_LOCAL, &flags); 729 if (ndm_state & NUD_NOARP) 730 __set_bit(BR_FDB_STATIC, &flags); 731 732 return flags; 733 } 734 735 static unsigned long __ndm_flags_to_fdb_flags(u8 ndm_flags) 736 { 737 unsigned long flags = 0; 738 739 if (ndm_flags & NTF_USE) 740 __set_bit(BR_FDB_ADDED_BY_USER, &flags); 741 if (ndm_flags & NTF_EXT_LEARNED) 742 __set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &flags); 743 if (ndm_flags & NTF_OFFLOADED) 744 __set_bit(BR_FDB_OFFLOADED, &flags); 745 if (ndm_flags & NTF_STICKY) 746 __set_bit(BR_FDB_STICKY, &flags); 747 748 return flags; 749 } 750 751 static int __fdb_flush_validate_ifindex(const struct net_bridge *br, 752 int ifindex, 753 struct netlink_ext_ack *extack) 754 { 755 const struct net_device *dev; 756 757 dev = __dev_get_by_index(dev_net(br->dev), ifindex); 758 if (!dev) { 759 NL_SET_ERR_MSG_MOD(extack, "Unknown flush device ifindex"); 760 return -ENODEV; 761 } 762 if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev)) { 763 NL_SET_ERR_MSG_MOD(extack, "Flush device is not a bridge or bridge port"); 764 return -EINVAL; 765 } 766 if (netif_is_bridge_master(dev) && dev != br->dev) { 767 NL_SET_ERR_MSG_MOD(extack, 768 "Flush bridge device does not match target bridge device"); 769 return -EINVAL; 770 } 771 if (netif_is_bridge_port(dev)) { 772 struct net_bridge_port *p = br_port_get_rtnl(dev); 773 774 if (p->br != br) { 775 NL_SET_ERR_MSG_MOD(extack, "Port belongs to a different bridge device"); 776 return -EINVAL; 777 } 778 } 779 780 return 0; 781 } 782 783 static const struct nla_policy br_fdb_del_bulk_policy[NDA_MAX + 1] = { 784 [NDA_VLAN] = NLA_POLICY_RANGE(NLA_U16, 1, VLAN_N_VID - 2), 785 [NDA_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 1), 786 [NDA_NDM_STATE_MASK] = { .type = NLA_U16 }, 787 [NDA_NDM_FLAGS_MASK] = { .type = NLA_U8 }, 788 }; 789 790 int br_fdb_delete_bulk(struct nlmsghdr *nlh, struct net_device *dev, 791 struct netlink_ext_ack *extack) 792 { 793 struct net_bridge_fdb_flush_desc desc = {}; 794 struct ndmsg *ndm = nlmsg_data(nlh); 795 struct net_bridge_port *p = NULL; 796 struct nlattr *tb[NDA_MAX + 1]; 797 struct net_bridge *br; 798 u8 ndm_flags; 799 int err; 800 801 ndm_flags = ndm->ndm_flags & ~FDB_FLUSH_IGNORED_NDM_FLAGS; 802 803 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, 804 br_fdb_del_bulk_policy, extack); 805 if (err) 806 return err; 807 808 if (netif_is_bridge_master(dev)) { 809 br = netdev_priv(dev); 810 } else { 811 p = br_port_get_rtnl(dev); 812 if (!p) { 813 NL_SET_ERR_MSG_MOD(extack, "Device is not a bridge port"); 814 return -EINVAL; 815 } 816 br = p->br; 817 } 818 819 if (tb[NDA_VLAN]) 820 desc.vlan_id = nla_get_u16(tb[NDA_VLAN]); 821 822 if (ndm_flags & ~FDB_FLUSH_ALLOWED_NDM_FLAGS) { 823 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm flag bits set"); 824 return -EINVAL; 825 } 826 if (ndm->ndm_state & ~FDB_FLUSH_ALLOWED_NDM_STATES) { 827 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm state bits set"); 828 return -EINVAL; 829 } 830 831 desc.flags |= __ndm_state_to_fdb_flags(ndm->ndm_state); 832 desc.flags |= __ndm_flags_to_fdb_flags(ndm_flags); 833 if (tb[NDA_NDM_STATE_MASK]) { 834 u16 ndm_state_mask = nla_get_u16(tb[NDA_NDM_STATE_MASK]); 835 836 desc.flags_mask |= __ndm_state_to_fdb_flags(ndm_state_mask); 837 } 838 if (tb[NDA_NDM_FLAGS_MASK]) { 839 u8 ndm_flags_mask = nla_get_u8(tb[NDA_NDM_FLAGS_MASK]); 840 841 desc.flags_mask |= __ndm_flags_to_fdb_flags(ndm_flags_mask); 842 } 843 if (tb[NDA_IFINDEX]) { 844 int ifidx = nla_get_s32(tb[NDA_IFINDEX]); 845 846 err = __fdb_flush_validate_ifindex(br, ifidx, extack); 847 if (err) 848 return err; 849 desc.port_ifindex = ifidx; 850 } else if (p) { 851 /* flush was invoked with port device and NTF_MASTER */ 852 desc.port_ifindex = p->dev->ifindex; 853 } 854 855 br_debug(br, "flushing port ifindex: %d vlan id: %u flags: 0x%lx flags mask: 0x%lx\n", 856 desc.port_ifindex, desc.vlan_id, desc.flags, desc.flags_mask); 857 858 br_fdb_flush(br, &desc); 859 860 return 0; 861 } 862 863 /* Flush all entries referring to a specific port. 864 * if do_all is set also flush static entries 865 * if vid is set delete all entries that match the vlan_id 866 */ 867 void br_fdb_delete_by_port(struct net_bridge *br, 868 const struct net_bridge_port *p, 869 u16 vid, 870 int do_all) 871 { 872 struct net_bridge_fdb_entry *f; 873 struct hlist_node *tmp; 874 875 spin_lock_bh(&br->hash_lock); 876 hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) { 877 if (f->dst != p) 878 continue; 879 880 if (!do_all) 881 if (test_bit(BR_FDB_STATIC, &f->flags) || 882 (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags) && 883 !test_bit(BR_FDB_OFFLOADED, &f->flags)) || 884 (vid && f->key.vlan_id != vid)) 885 continue; 886 887 if (test_bit(BR_FDB_LOCAL, &f->flags)) 888 fdb_delete_local(br, p, f); 889 else 890 fdb_delete(br, f, true); 891 } 892 spin_unlock_bh(&br->hash_lock); 893 } 894 895 #if IS_ENABLED(CONFIG_ATM_LANE) 896 /* Interface used by ATM LANE hook to test 897 * if an addr is on some other bridge port */ 898 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr) 899 { 900 struct net_bridge_fdb_entry *fdb; 901 struct net_bridge_port *port; 902 int ret; 903 904 rcu_read_lock(); 905 port = br_port_get_rcu(dev); 906 if (!port) 907 ret = 0; 908 else { 909 const struct net_bridge_port *dst = NULL; 910 911 fdb = br_fdb_find_rcu(port->br, addr, 0); 912 if (fdb) 913 dst = READ_ONCE(fdb->dst); 914 915 ret = dst && dst->dev != dev && 916 dst->state == BR_STATE_FORWARDING; 917 } 918 rcu_read_unlock(); 919 920 return ret; 921 } 922 #endif /* CONFIG_ATM_LANE */ 923 924 /* 925 * Fill buffer with forwarding table records in 926 * the API format. 927 */ 928 int br_fdb_fillbuf(struct net_bridge *br, void *buf, 929 unsigned long maxnum, unsigned long skip) 930 { 931 struct net_bridge_fdb_entry *f; 932 struct __fdb_entry *fe = buf; 933 unsigned long delta; 934 int num = 0; 935 936 memset(buf, 0, maxnum*sizeof(struct __fdb_entry)); 937 938 rcu_read_lock(); 939 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 940 if (num >= maxnum) 941 break; 942 943 if (has_expired(br, f)) 944 continue; 945 946 /* ignore pseudo entry for local MAC address */ 947 if (!f->dst) 948 continue; 949 950 if (skip) { 951 --skip; 952 continue; 953 } 954 955 /* convert from internal format to API */ 956 memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN); 957 958 /* due to ABI compat need to split into hi/lo */ 959 fe->port_no = f->dst->port_no; 960 fe->port_hi = f->dst->port_no >> 8; 961 962 fe->is_local = test_bit(BR_FDB_LOCAL, &f->flags); 963 if (!test_bit(BR_FDB_STATIC, &f->flags)) { 964 delta = jiffies - READ_ONCE(f->updated); 965 fe->ageing_timer_value = 966 jiffies_delta_to_clock_t(delta); 967 } 968 ++fe; 969 ++num; 970 } 971 rcu_read_unlock(); 972 973 return num; 974 } 975 976 /* Add entry for local address of interface */ 977 int br_fdb_add_local(struct net_bridge *br, struct net_bridge_port *source, 978 const unsigned char *addr, u16 vid) 979 { 980 int ret; 981 982 spin_lock_bh(&br->hash_lock); 983 ret = fdb_add_local(br, source, addr, vid); 984 spin_unlock_bh(&br->hash_lock); 985 return ret; 986 } 987 988 /* returns true if the fdb was modified */ 989 static bool __fdb_mark_active(struct net_bridge_fdb_entry *fdb) 990 { 991 return !!(test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags) && 992 test_and_clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags)); 993 } 994 995 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 996 const unsigned char *addr, u16 vid, unsigned long flags) 997 { 998 struct net_bridge_fdb_entry *fdb; 999 1000 /* some users want to always flood. */ 1001 if (hold_time(br) == 0) 1002 return; 1003 1004 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid); 1005 if (likely(fdb)) { 1006 /* attempt to update an entry for a local interface */ 1007 if (unlikely(test_bit(BR_FDB_LOCAL, &fdb->flags))) { 1008 if (net_ratelimit()) 1009 br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n", 1010 source->dev->name, addr, vid); 1011 } else { 1012 unsigned long now = jiffies; 1013 bool fdb_modified = false; 1014 1015 if (now != READ_ONCE(fdb->updated)) { 1016 WRITE_ONCE(fdb->updated, now); 1017 fdb_modified = __fdb_mark_active(fdb); 1018 } 1019 1020 /* fastpath: update of existing entry */ 1021 if (unlikely(source != READ_ONCE(fdb->dst) && 1022 !test_bit(BR_FDB_STICKY, &fdb->flags))) { 1023 br_switchdev_fdb_notify(br, fdb, RTM_DELNEIGH); 1024 WRITE_ONCE(fdb->dst, source); 1025 fdb_modified = true; 1026 /* Take over HW learned entry */ 1027 if (unlikely(test_bit(BR_FDB_ADDED_BY_EXT_LEARN, 1028 &fdb->flags))) 1029 clear_bit(BR_FDB_ADDED_BY_EXT_LEARN, 1030 &fdb->flags); 1031 /* Clear locked flag when roaming to an 1032 * unlocked port. 1033 */ 1034 if (unlikely(test_bit(BR_FDB_LOCKED, &fdb->flags))) 1035 clear_bit(BR_FDB_LOCKED, &fdb->flags); 1036 } 1037 1038 if (unlikely(test_bit(BR_FDB_ADDED_BY_USER, &flags))) { 1039 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); 1040 if (test_and_clear_bit(BR_FDB_DYNAMIC_LEARNED, 1041 &fdb->flags)) 1042 atomic_dec(&br->fdb_n_learned); 1043 } 1044 if (unlikely(fdb_modified)) { 1045 trace_br_fdb_update(br, source, addr, vid, flags); 1046 fdb_notify(br, fdb, RTM_NEWNEIGH, true); 1047 } 1048 } 1049 } else { 1050 spin_lock(&br->hash_lock); 1051 fdb = fdb_create(br, source, addr, vid, flags); 1052 if (fdb) { 1053 trace_br_fdb_update(br, source, addr, vid, flags); 1054 fdb_notify(br, fdb, RTM_NEWNEIGH, true); 1055 } 1056 /* else we lose race and someone else inserts 1057 * it first, don't bother updating 1058 */ 1059 spin_unlock(&br->hash_lock); 1060 } 1061 } 1062 1063 /* Dump information about entries, in response to GETNEIGH */ 1064 int br_fdb_dump(struct sk_buff *skb, 1065 struct netlink_callback *cb, 1066 struct net_device *dev, 1067 struct net_device *filter_dev, 1068 int *idx) 1069 { 1070 struct ndo_fdb_dump_context *ctx = (void *)cb->ctx; 1071 struct net_bridge *br = netdev_priv(dev); 1072 struct net_bridge_fdb_entry *f; 1073 int err = 0; 1074 1075 if (!netif_is_bridge_master(dev)) 1076 return err; 1077 1078 if (!filter_dev) { 1079 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); 1080 if (err < 0) 1081 return err; 1082 } 1083 1084 rcu_read_lock(); 1085 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 1086 if (*idx < ctx->fdb_idx) 1087 goto skip; 1088 if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) { 1089 if (filter_dev != dev) 1090 goto skip; 1091 /* !f->dst is a special case for bridge 1092 * It means the MAC belongs to the bridge 1093 * Therefore need a little more filtering 1094 * we only want to dump the !f->dst case 1095 */ 1096 if (f->dst) 1097 goto skip; 1098 } 1099 if (!filter_dev && f->dst) 1100 goto skip; 1101 1102 err = fdb_fill_info(skb, br, f, 1103 NETLINK_CB(cb->skb).portid, 1104 cb->nlh->nlmsg_seq, 1105 RTM_NEWNEIGH, 1106 NLM_F_MULTI); 1107 if (err < 0) 1108 break; 1109 skip: 1110 *idx += 1; 1111 } 1112 rcu_read_unlock(); 1113 1114 return err; 1115 } 1116 1117 int br_fdb_get(struct sk_buff *skb, 1118 struct nlattr *tb[], 1119 struct net_device *dev, 1120 const unsigned char *addr, 1121 u16 vid, u32 portid, u32 seq, 1122 struct netlink_ext_ack *extack) 1123 { 1124 struct net_bridge *br = netdev_priv(dev); 1125 struct net_bridge_fdb_entry *f; 1126 int err = 0; 1127 1128 rcu_read_lock(); 1129 f = br_fdb_find_rcu(br, addr, vid); 1130 if (!f) { 1131 NL_SET_ERR_MSG(extack, "Fdb entry not found"); 1132 err = -ENOENT; 1133 goto errout; 1134 } 1135 1136 err = fdb_fill_info(skb, br, f, portid, seq, 1137 RTM_NEWNEIGH, 0); 1138 errout: 1139 rcu_read_unlock(); 1140 return err; 1141 } 1142 1143 /* returns true if the fdb is modified */ 1144 static bool fdb_handle_notify(struct net_bridge_fdb_entry *fdb, u8 notify) 1145 { 1146 bool modified = false; 1147 1148 /* allow to mark an entry as inactive, usually done on creation */ 1149 if ((notify & FDB_NOTIFY_INACTIVE_BIT) && 1150 !test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags)) 1151 modified = true; 1152 1153 if ((notify & FDB_NOTIFY_BIT) && 1154 !test_and_set_bit(BR_FDB_NOTIFY, &fdb->flags)) { 1155 /* enabled activity tracking */ 1156 modified = true; 1157 } else if (!(notify & FDB_NOTIFY_BIT) && 1158 test_and_clear_bit(BR_FDB_NOTIFY, &fdb->flags)) { 1159 /* disabled activity tracking, clear notify state */ 1160 clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags); 1161 modified = true; 1162 } 1163 1164 return modified; 1165 } 1166 1167 /* Update (create or replace) forwarding database entry */ 1168 static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source, 1169 const u8 *addr, struct ndmsg *ndm, u16 flags, u16 vid, 1170 struct nlattr *nfea_tb[]) 1171 { 1172 bool is_sticky = !!(ndm->ndm_flags & NTF_STICKY); 1173 bool refresh = !nfea_tb[NFEA_DONT_REFRESH]; 1174 struct net_bridge_fdb_entry *fdb; 1175 u16 state = ndm->ndm_state; 1176 bool modified = false; 1177 u8 notify = 0; 1178 1179 /* If the port cannot learn allow only local and static entries */ 1180 if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) && 1181 !(source->state == BR_STATE_LEARNING || 1182 source->state == BR_STATE_FORWARDING)) 1183 return -EPERM; 1184 1185 if (!source && !(state & NUD_PERMANENT)) { 1186 pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n", 1187 br->dev->name); 1188 return -EINVAL; 1189 } 1190 1191 if (is_sticky && (state & NUD_PERMANENT)) 1192 return -EINVAL; 1193 1194 if (nfea_tb[NFEA_ACTIVITY_NOTIFY]) { 1195 notify = nla_get_u8(nfea_tb[NFEA_ACTIVITY_NOTIFY]); 1196 if ((notify & ~BR_FDB_NOTIFY_SETTABLE_BITS) || 1197 (notify & BR_FDB_NOTIFY_SETTABLE_BITS) == FDB_NOTIFY_INACTIVE_BIT) 1198 return -EINVAL; 1199 } 1200 1201 fdb = br_fdb_find(br, addr, vid); 1202 if (fdb == NULL) { 1203 if (!(flags & NLM_F_CREATE)) 1204 return -ENOENT; 1205 1206 fdb = fdb_create(br, source, addr, vid, 1207 BIT(BR_FDB_ADDED_BY_USER)); 1208 if (!fdb) 1209 return -ENOMEM; 1210 1211 modified = true; 1212 } else { 1213 if (flags & NLM_F_EXCL) 1214 return -EEXIST; 1215 1216 if (READ_ONCE(fdb->dst) != source) { 1217 WRITE_ONCE(fdb->dst, source); 1218 modified = true; 1219 } 1220 1221 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); 1222 if (test_and_clear_bit(BR_FDB_DYNAMIC_LEARNED, &fdb->flags)) 1223 atomic_dec(&br->fdb_n_learned); 1224 } 1225 1226 if (fdb_to_nud(br, fdb) != state) { 1227 if (state & NUD_PERMANENT) { 1228 set_bit(BR_FDB_LOCAL, &fdb->flags); 1229 if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags)) 1230 fdb_add_hw_addr(br, addr); 1231 } else if (state & NUD_NOARP) { 1232 clear_bit(BR_FDB_LOCAL, &fdb->flags); 1233 if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags)) 1234 fdb_add_hw_addr(br, addr); 1235 } else { 1236 clear_bit(BR_FDB_LOCAL, &fdb->flags); 1237 if (test_and_clear_bit(BR_FDB_STATIC, &fdb->flags)) 1238 fdb_del_hw_addr(br, addr); 1239 } 1240 1241 modified = true; 1242 } 1243 1244 if (is_sticky != test_bit(BR_FDB_STICKY, &fdb->flags)) { 1245 change_bit(BR_FDB_STICKY, &fdb->flags); 1246 modified = true; 1247 } 1248 1249 if (test_and_clear_bit(BR_FDB_LOCKED, &fdb->flags)) 1250 modified = true; 1251 1252 if (fdb_handle_notify(fdb, notify)) 1253 modified = true; 1254 1255 WRITE_ONCE(fdb->used, jiffies); 1256 if (modified) { 1257 if (refresh) 1258 WRITE_ONCE(fdb->updated, jiffies); 1259 fdb_notify(br, fdb, RTM_NEWNEIGH, true); 1260 } 1261 1262 return 0; 1263 } 1264 1265 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br, 1266 struct net_bridge_port *p, const unsigned char *addr, 1267 u16 nlh_flags, u16 vid, struct nlattr *nfea_tb[], 1268 bool *notified, struct netlink_ext_ack *extack) 1269 { 1270 int err = 0; 1271 1272 if (ndm->ndm_flags & NTF_USE) { 1273 if (!p) { 1274 pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n", 1275 br->dev->name); 1276 return -EINVAL; 1277 } 1278 if (!nbp_state_should_learn(p)) 1279 return 0; 1280 1281 local_bh_disable(); 1282 rcu_read_lock(); 1283 br_fdb_update(br, p, addr, vid, BIT(BR_FDB_ADDED_BY_USER)); 1284 rcu_read_unlock(); 1285 local_bh_enable(); 1286 } else if (ndm->ndm_flags & NTF_EXT_LEARNED) { 1287 if (!p && !(ndm->ndm_state & NUD_PERMANENT)) { 1288 NL_SET_ERR_MSG_MOD(extack, 1289 "FDB entry towards bridge must be permanent"); 1290 return -EINVAL; 1291 } 1292 err = br_fdb_external_learn_add(br, p, addr, vid, false, true); 1293 } else { 1294 spin_lock_bh(&br->hash_lock); 1295 err = fdb_add_entry(br, p, addr, ndm, nlh_flags, vid, nfea_tb); 1296 spin_unlock_bh(&br->hash_lock); 1297 } 1298 1299 if (!err) 1300 *notified = true; 1301 return err; 1302 } 1303 1304 static const struct nla_policy br_nda_fdb_pol[NFEA_MAX + 1] = { 1305 [NFEA_ACTIVITY_NOTIFY] = { .type = NLA_U8 }, 1306 [NFEA_DONT_REFRESH] = { .type = NLA_FLAG }, 1307 }; 1308 1309 /* Add new permanent fdb entry with RTM_NEWNEIGH */ 1310 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 1311 struct net_device *dev, 1312 const unsigned char *addr, u16 vid, u16 nlh_flags, 1313 bool *notified, struct netlink_ext_ack *extack) 1314 { 1315 struct nlattr *nfea_tb[NFEA_MAX + 1], *attr; 1316 struct net_bridge_vlan_group *vg; 1317 struct net_bridge_port *p = NULL; 1318 struct net_bridge_vlan *v; 1319 struct net_bridge *br = NULL; 1320 u32 ext_flags = 0; 1321 int err = 0; 1322 1323 trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags); 1324 1325 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) { 1326 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state); 1327 return -EINVAL; 1328 } 1329 1330 if (is_zero_ether_addr(addr)) { 1331 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n"); 1332 return -EINVAL; 1333 } 1334 1335 if (netif_is_bridge_master(dev)) { 1336 br = netdev_priv(dev); 1337 vg = br_vlan_group(br); 1338 } else { 1339 p = br_port_get_rtnl(dev); 1340 if (!p) { 1341 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n", 1342 dev->name); 1343 return -EINVAL; 1344 } 1345 br = p->br; 1346 vg = nbp_vlan_group(p); 1347 } 1348 1349 if (tb[NDA_FLAGS_EXT]) 1350 ext_flags = nla_get_u32(tb[NDA_FLAGS_EXT]); 1351 1352 if (ext_flags & NTF_EXT_LOCKED) { 1353 NL_SET_ERR_MSG_MOD(extack, "Cannot add FDB entry with \"locked\" flag set"); 1354 return -EINVAL; 1355 } 1356 1357 if (tb[NDA_FDB_EXT_ATTRS]) { 1358 attr = tb[NDA_FDB_EXT_ATTRS]; 1359 err = nla_parse_nested(nfea_tb, NFEA_MAX, attr, 1360 br_nda_fdb_pol, extack); 1361 if (err) 1362 return err; 1363 } else { 1364 memset(nfea_tb, 0, sizeof(struct nlattr *) * (NFEA_MAX + 1)); 1365 } 1366 1367 if (vid) { 1368 v = br_vlan_find(vg, vid); 1369 if (!v || !br_vlan_should_use(v)) { 1370 pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name); 1371 return -EINVAL; 1372 } 1373 1374 /* VID was specified, so use it. */ 1375 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid, nfea_tb, 1376 notified, extack); 1377 } else { 1378 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0, nfea_tb, 1379 notified, extack); 1380 if (err || !vg || !vg->num_vlans) 1381 goto out; 1382 1383 /* We have vlans configured on this port and user didn't 1384 * specify a VLAN. To be nice, add/update entry for every 1385 * vlan on this port. 1386 */ 1387 list_for_each_entry(v, &vg->vlan_list, vlist) { 1388 if (!br_vlan_should_use(v)) 1389 continue; 1390 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid, 1391 nfea_tb, notified, extack); 1392 if (err) 1393 goto out; 1394 } 1395 } 1396 1397 out: 1398 return err; 1399 } 1400 1401 static int fdb_delete_by_addr_and_port(struct net_bridge *br, 1402 const struct net_bridge_port *p, 1403 const u8 *addr, u16 vlan, bool *notified) 1404 { 1405 struct net_bridge_fdb_entry *fdb; 1406 1407 fdb = br_fdb_find(br, addr, vlan); 1408 if (!fdb || READ_ONCE(fdb->dst) != p) 1409 return -ENOENT; 1410 1411 fdb_delete(br, fdb, true); 1412 *notified = true; 1413 1414 return 0; 1415 } 1416 1417 static int __br_fdb_delete(struct net_bridge *br, 1418 const struct net_bridge_port *p, 1419 const unsigned char *addr, u16 vid, bool *notified) 1420 { 1421 int err; 1422 1423 spin_lock_bh(&br->hash_lock); 1424 err = fdb_delete_by_addr_and_port(br, p, addr, vid, notified); 1425 spin_unlock_bh(&br->hash_lock); 1426 1427 return err; 1428 } 1429 1430 /* Remove neighbor entry with RTM_DELNEIGH */ 1431 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 1432 struct net_device *dev, 1433 const unsigned char *addr, u16 vid, bool *notified, 1434 struct netlink_ext_ack *extack) 1435 { 1436 struct net_bridge_vlan_group *vg; 1437 struct net_bridge_port *p = NULL; 1438 struct net_bridge *br; 1439 int err; 1440 1441 if (netif_is_bridge_master(dev)) { 1442 br = netdev_priv(dev); 1443 vg = br_vlan_group(br); 1444 } else { 1445 p = br_port_get_rtnl(dev); 1446 if (!p) { 1447 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n", 1448 dev->name); 1449 return -EINVAL; 1450 } 1451 vg = nbp_vlan_group(p); 1452 br = p->br; 1453 } 1454 1455 if (vid) { 1456 err = __br_fdb_delete(br, p, addr, vid, notified); 1457 } else { 1458 struct net_bridge_vlan *v; 1459 1460 err = -ENOENT; 1461 err &= __br_fdb_delete(br, p, addr, 0, notified); 1462 if (!vg || !vg->num_vlans) 1463 return err; 1464 1465 list_for_each_entry(v, &vg->vlan_list, vlist) { 1466 if (!br_vlan_should_use(v)) 1467 continue; 1468 err &= __br_fdb_delete(br, p, addr, v->vid, notified); 1469 } 1470 } 1471 1472 return err; 1473 } 1474 1475 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p) 1476 { 1477 struct net_bridge_fdb_entry *f, *tmp; 1478 int err = 0; 1479 1480 ASSERT_RTNL(); 1481 1482 /* the key here is that static entries change only under rtnl */ 1483 rcu_read_lock(); 1484 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 1485 /* We only care for static entries */ 1486 if (!test_bit(BR_FDB_STATIC, &f->flags)) 1487 continue; 1488 err = dev_uc_add(p->dev, f->key.addr.addr); 1489 if (err) 1490 goto rollback; 1491 } 1492 done: 1493 rcu_read_unlock(); 1494 1495 return err; 1496 1497 rollback: 1498 hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) { 1499 /* We only care for static entries */ 1500 if (!test_bit(BR_FDB_STATIC, &tmp->flags)) 1501 continue; 1502 if (tmp == f) 1503 break; 1504 dev_uc_del(p->dev, tmp->key.addr.addr); 1505 } 1506 1507 goto done; 1508 } 1509 1510 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p) 1511 { 1512 struct net_bridge_fdb_entry *f; 1513 1514 ASSERT_RTNL(); 1515 1516 rcu_read_lock(); 1517 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { 1518 /* We only care for static entries */ 1519 if (!test_bit(BR_FDB_STATIC, &f->flags)) 1520 continue; 1521 1522 dev_uc_del(p->dev, f->key.addr.addr); 1523 } 1524 rcu_read_unlock(); 1525 } 1526 1527 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 1528 const unsigned char *addr, u16 vid, bool locked, 1529 bool swdev_notify) 1530 { 1531 struct net_bridge_fdb_entry *fdb; 1532 bool modified = false; 1533 int err = 0; 1534 1535 trace_br_fdb_external_learn_add(br, p, addr, vid); 1536 1537 if (locked && (!p || !(p->flags & BR_PORT_MAB))) 1538 return -EINVAL; 1539 1540 spin_lock_bh(&br->hash_lock); 1541 1542 fdb = br_fdb_find(br, addr, vid); 1543 if (!fdb) { 1544 unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN); 1545 1546 if (swdev_notify) 1547 flags |= BIT(BR_FDB_ADDED_BY_USER); 1548 1549 if (!p) 1550 flags |= BIT(BR_FDB_LOCAL); 1551 1552 if (locked) 1553 flags |= BIT(BR_FDB_LOCKED); 1554 1555 fdb = fdb_create(br, p, addr, vid, flags); 1556 if (!fdb) { 1557 err = -ENOMEM; 1558 goto err_unlock; 1559 } 1560 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify); 1561 } else { 1562 if (locked && 1563 (!test_bit(BR_FDB_LOCKED, &fdb->flags) || 1564 READ_ONCE(fdb->dst) != p)) { 1565 err = -EINVAL; 1566 goto err_unlock; 1567 } 1568 1569 WRITE_ONCE(fdb->updated, jiffies); 1570 1571 if (READ_ONCE(fdb->dst) != p) { 1572 WRITE_ONCE(fdb->dst, p); 1573 modified = true; 1574 } 1575 1576 if (test_and_set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) { 1577 /* Refresh entry */ 1578 WRITE_ONCE(fdb->used, jiffies); 1579 } else { 1580 modified = true; 1581 } 1582 1583 if (locked != test_bit(BR_FDB_LOCKED, &fdb->flags)) { 1584 change_bit(BR_FDB_LOCKED, &fdb->flags); 1585 modified = true; 1586 } 1587 1588 if (swdev_notify) 1589 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); 1590 1591 if (!p) 1592 set_bit(BR_FDB_LOCAL, &fdb->flags); 1593 1594 if ((swdev_notify || !p) && 1595 test_and_clear_bit(BR_FDB_DYNAMIC_LEARNED, &fdb->flags)) 1596 atomic_dec(&br->fdb_n_learned); 1597 1598 if (modified) 1599 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify); 1600 } 1601 1602 err_unlock: 1603 spin_unlock_bh(&br->hash_lock); 1604 1605 return err; 1606 } 1607 1608 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 1609 const unsigned char *addr, u16 vid, 1610 bool swdev_notify) 1611 { 1612 struct net_bridge_fdb_entry *fdb; 1613 int err = 0; 1614 1615 spin_lock_bh(&br->hash_lock); 1616 1617 fdb = br_fdb_find(br, addr, vid); 1618 if (fdb && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) 1619 fdb_delete(br, fdb, swdev_notify); 1620 else 1621 err = -ENOENT; 1622 1623 spin_unlock_bh(&br->hash_lock); 1624 1625 return err; 1626 } 1627 1628 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 1629 const unsigned char *addr, u16 vid, bool offloaded) 1630 { 1631 struct net_bridge_fdb_entry *fdb; 1632 1633 spin_lock_bh(&br->hash_lock); 1634 1635 fdb = br_fdb_find(br, addr, vid); 1636 if (fdb && offloaded != test_bit(BR_FDB_OFFLOADED, &fdb->flags)) 1637 change_bit(BR_FDB_OFFLOADED, &fdb->flags); 1638 1639 spin_unlock_bh(&br->hash_lock); 1640 } 1641 1642 void br_fdb_clear_offload(const struct net_device *dev, u16 vid) 1643 { 1644 struct net_bridge_fdb_entry *f; 1645 struct net_bridge_port *p; 1646 1647 ASSERT_RTNL(); 1648 1649 p = br_port_get_rtnl(dev); 1650 if (!p) 1651 return; 1652 1653 spin_lock_bh(&p->br->hash_lock); 1654 hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) { 1655 if (f->dst == p && f->key.vlan_id == vid) 1656 clear_bit(BR_FDB_OFFLOADED, &f->flags); 1657 } 1658 spin_unlock_bh(&p->br->hash_lock); 1659 } 1660 EXPORT_SYMBOL_GPL(br_fdb_clear_offload); 1661