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