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