1/* 2 * Forwarding database 3 * Linux ethernet bridge 4 * 5 * Authors: 6 * Lennert Buytenhek <buytenh@gnu.org> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 */ 13 14#include <linux/kernel.h> 15#include <linux/init.h> 16#include <linux/rculist.h> 17#include <linux/spinlock.h> 18#include <linux/times.h> 19#include <linux/netdevice.h> 20#include <linux/etherdevice.h> 21#include <linux/jhash.h> 22#include <linux/random.h> 23#include <linux/slab.h> 24#include <linux/atomic.h> 25#include <asm/unaligned.h> 26#include <linux/if_vlan.h> 27#include "br_private.h" 28 29static struct kmem_cache *br_fdb_cache __read_mostly; 30static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 31 const unsigned char *addr, u16 vid); 32static void fdb_notify(struct net_bridge *br, 33 const struct net_bridge_fdb_entry *, int); 34 35static u32 fdb_salt __read_mostly; 36 37int __init br_fdb_init(void) 38{ 39 br_fdb_cache = kmem_cache_create("bridge_fdb_cache", 40 sizeof(struct net_bridge_fdb_entry), 41 0, 42 SLAB_HWCACHE_ALIGN, NULL); 43 if (!br_fdb_cache) 44 return -ENOMEM; 45 46 get_random_bytes(&fdb_salt, sizeof(fdb_salt)); 47 return 0; 48} 49 50void br_fdb_fini(void) 51{ 52 kmem_cache_destroy(br_fdb_cache); 53} 54 55 56/* if topology_changing then use forward_delay (default 15 sec) 57 * otherwise keep longer (default 5 minutes) 58 */ 59static inline unsigned long hold_time(const struct net_bridge *br) 60{ 61 return br->topology_change ? br->forward_delay : br->ageing_time; 62} 63 64static inline int has_expired(const struct net_bridge *br, 65 const struct net_bridge_fdb_entry *fdb) 66{ 67 return !fdb->is_static && 68 time_before_eq(fdb->updated + hold_time(br), jiffies); 69} 70 71static inline int br_mac_hash(const unsigned char *mac, __u16 vid) 72{ 73 /* use 1 byte of OUI and 3 bytes of NIC */ 74 u32 key = get_unaligned((u32 *)(mac + 2)); 75 return jhash_2words(key, vid, fdb_salt) & (BR_HASH_SIZE - 1); 76} 77 78static void fdb_rcu_free(struct rcu_head *head) 79{ 80 struct net_bridge_fdb_entry *ent 81 = container_of(head, struct net_bridge_fdb_entry, rcu); 82 kmem_cache_free(br_fdb_cache, ent); 83} 84 85static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f) 86{ 87 hlist_del_rcu(&f->hlist); 88 fdb_notify(br, f, RTM_DELNEIGH); 89 call_rcu(&f->rcu, fdb_rcu_free); 90} 91 92void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr) 93{ 94 struct net_bridge *br = p->br; 95 bool no_vlan = (nbp_get_vlan_info(p) == NULL) ? true : false; 96 int i; 97 98 spin_lock_bh(&br->hash_lock); 99 100 /* Search all chains since old address/hash is unknown */ 101 for (i = 0; i < BR_HASH_SIZE; i++) { 102 struct hlist_node *h; 103 hlist_for_each(h, &br->hash[i]) { 104 struct net_bridge_fdb_entry *f; 105 106 f = hlist_entry(h, struct net_bridge_fdb_entry, hlist); 107 if (f->dst == p && f->is_local) { 108 /* maybe another port has same hw addr? */ 109 struct net_bridge_port *op; 110 u16 vid = f->vlan_id; 111 list_for_each_entry(op, &br->port_list, list) { 112 if (op != p && 113 ether_addr_equal(op->dev->dev_addr, 114 f->addr.addr) && 115 nbp_vlan_find(op, vid)) { 116 f->dst = op; 117 goto insert; 118 } 119 } 120 121 /* delete old one */ 122 fdb_delete(br, f); 123insert: 124 /* insert new address, may fail if invalid 125 * address or dup. 126 */ 127 fdb_insert(br, p, newaddr, vid); 128 129 /* if this port has no vlan information 130 * configured, we can safely be done at 131 * this point. 132 */ 133 if (no_vlan) 134 goto done; 135 } 136 } 137 } 138 139done: 140 spin_unlock_bh(&br->hash_lock); 141} 142 143void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) 144{ 145 struct net_bridge_fdb_entry *f; 146 struct net_port_vlans *pv; 147 u16 vid = 0; 148 149 /* If old entry was unassociated with any port, then delete it. */ 150 f = __br_fdb_get(br, br->dev->dev_addr, 0); 151 if (f && f->is_local && !f->dst) 152 fdb_delete(br, f); 153 154 fdb_insert(br, NULL, newaddr, 0); 155 156 /* Now remove and add entries for every VLAN configured on the 157 * bridge. This function runs under RTNL so the bitmap will not 158 * change from under us. 159 */ 160 pv = br_get_vlan_info(br); 161 if (!pv) 162 return; 163 164 for_each_set_bit_from(vid, pv->vlan_bitmap, BR_VLAN_BITMAP_LEN) { 165 f = __br_fdb_get(br, br->dev->dev_addr, vid); 166 if (f && f->is_local && !f->dst) 167 fdb_delete(br, f); 168 fdb_insert(br, NULL, newaddr, vid); 169 } 170} 171 172void br_fdb_cleanup(unsigned long _data) 173{ 174 struct net_bridge *br = (struct net_bridge *)_data; 175 unsigned long delay = hold_time(br); 176 unsigned long next_timer = jiffies + br->ageing_time; 177 int i; 178 179 spin_lock(&br->hash_lock); 180 for (i = 0; i < BR_HASH_SIZE; i++) { 181 struct net_bridge_fdb_entry *f; 182 struct hlist_node *n; 183 184 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) { 185 unsigned long this_timer; 186 if (f->is_static) 187 continue; 188 this_timer = f->updated + delay; 189 if (time_before_eq(this_timer, jiffies)) 190 fdb_delete(br, f); 191 else if (time_before(this_timer, next_timer)) 192 next_timer = this_timer; 193 } 194 } 195 spin_unlock(&br->hash_lock); 196 197 mod_timer(&br->gc_timer, round_jiffies_up(next_timer)); 198} 199 200/* Completely flush all dynamic entries in forwarding database.*/ 201void br_fdb_flush(struct net_bridge *br) 202{ 203 int i; 204 205 spin_lock_bh(&br->hash_lock); 206 for (i = 0; i < BR_HASH_SIZE; i++) { 207 struct net_bridge_fdb_entry *f; 208 struct hlist_node *n; 209 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) { 210 if (!f->is_static) 211 fdb_delete(br, f); 212 } 213 } 214 spin_unlock_bh(&br->hash_lock); 215} 216 217/* Flush all entries referring to a specific port. 218 * if do_all is set also flush static entries 219 */ 220void br_fdb_delete_by_port(struct net_bridge *br, 221 const struct net_bridge_port *p, 222 int do_all) 223{ 224 int i; 225 226 spin_lock_bh(&br->hash_lock); 227 for (i = 0; i < BR_HASH_SIZE; i++) { 228 struct hlist_node *h, *g; 229 230 hlist_for_each_safe(h, g, &br->hash[i]) { 231 struct net_bridge_fdb_entry *f 232 = hlist_entry(h, struct net_bridge_fdb_entry, hlist); 233 if (f->dst != p) 234 continue; 235 236 if (f->is_static && !do_all) 237 continue; 238 /* 239 * if multiple ports all have the same device address 240 * then when one port is deleted, assign 241 * the local entry to other port 242 */ 243 if (f->is_local) { 244 struct net_bridge_port *op; 245 list_for_each_entry(op, &br->port_list, list) { 246 if (op != p && 247 ether_addr_equal(op->dev->dev_addr, 248 f->addr.addr)) { 249 f->dst = op; 250 goto skip_delete; 251 } 252 } 253 } 254 255 fdb_delete(br, f); 256 skip_delete: ; 257 } 258 } 259 spin_unlock_bh(&br->hash_lock); 260} 261 262/* No locking or refcounting, assumes caller has rcu_read_lock */ 263struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, 264 const unsigned char *addr, 265 __u16 vid) 266{ 267 struct net_bridge_fdb_entry *fdb; 268 269 hlist_for_each_entry_rcu(fdb, 270 &br->hash[br_mac_hash(addr, vid)], hlist) { 271 if (ether_addr_equal(fdb->addr.addr, addr) && 272 fdb->vlan_id == vid) { 273 if (unlikely(has_expired(br, fdb))) 274 break; 275 return fdb; 276 } 277 } 278 279 return NULL; 280} 281 282#if IS_ENABLED(CONFIG_ATM_LANE) 283/* Interface used by ATM LANE hook to test 284 * if an addr is on some other bridge port */ 285int br_fdb_test_addr(struct net_device *dev, unsigned char *addr) 286{ 287 struct net_bridge_fdb_entry *fdb; 288 struct net_bridge_port *port; 289 int ret; 290 291 rcu_read_lock(); 292 port = br_port_get_rcu(dev); 293 if (!port) 294 ret = 0; 295 else { 296 fdb = __br_fdb_get(port->br, addr, 0); 297 ret = fdb && fdb->dst && fdb->dst->dev != dev && 298 fdb->dst->state == BR_STATE_FORWARDING; 299 } 300 rcu_read_unlock(); 301 302 return ret; 303} 304#endif /* CONFIG_ATM_LANE */ 305 306/* 307 * Fill buffer with forwarding table records in 308 * the API format. 309 */ 310int br_fdb_fillbuf(struct net_bridge *br, void *buf, 311 unsigned long maxnum, unsigned long skip) 312{ 313 struct __fdb_entry *fe = buf; 314 int i, num = 0; 315 struct net_bridge_fdb_entry *f; 316 317 memset(buf, 0, maxnum*sizeof(struct __fdb_entry)); 318 319 rcu_read_lock(); 320 for (i = 0; i < BR_HASH_SIZE; i++) { 321 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) { 322 if (num >= maxnum) 323 goto out; 324 325 if (has_expired(br, f)) 326 continue; 327 328 /* ignore pseudo entry for local MAC address */ 329 if (!f->dst) 330 continue; 331 332 if (skip) { 333 --skip; 334 continue; 335 } 336 337 /* convert from internal format to API */ 338 memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN); 339 340 /* due to ABI compat need to split into hi/lo */ 341 fe->port_no = f->dst->port_no; 342 fe->port_hi = f->dst->port_no >> 8; 343 344 fe->is_local = f->is_local; 345 if (!f->is_static) 346 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated); 347 ++fe; 348 ++num; 349 } 350 } 351 352 out: 353 rcu_read_unlock(); 354 355 return num; 356} 357 358static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head, 359 const unsigned char *addr, 360 __u16 vid) 361{ 362 struct net_bridge_fdb_entry *fdb; 363 364 hlist_for_each_entry(fdb, head, hlist) { 365 if (ether_addr_equal(fdb->addr.addr, addr) && 366 fdb->vlan_id == vid) 367 return fdb; 368 } 369 return NULL; 370} 371 372static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head, 373 const unsigned char *addr, 374 __u16 vid) 375{ 376 struct net_bridge_fdb_entry *fdb; 377 378 hlist_for_each_entry_rcu(fdb, head, hlist) { 379 if (ether_addr_equal(fdb->addr.addr, addr) && 380 fdb->vlan_id == vid) 381 return fdb; 382 } 383 return NULL; 384} 385 386static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head, 387 struct net_bridge_port *source, 388 const unsigned char *addr, 389 __u16 vid) 390{ 391 struct net_bridge_fdb_entry *fdb; 392 393 fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC); 394 if (fdb) { 395 memcpy(fdb->addr.addr, addr, ETH_ALEN); 396 fdb->dst = source; 397 fdb->vlan_id = vid; 398 fdb->is_local = 0; 399 fdb->is_static = 0; 400 fdb->updated = fdb->used = jiffies; 401 hlist_add_head_rcu(&fdb->hlist, head); 402 } 403 return fdb; 404} 405 406static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 407 const unsigned char *addr, u16 vid) 408{ 409 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; 410 struct net_bridge_fdb_entry *fdb; 411 412 if (!is_valid_ether_addr(addr)) 413 return -EINVAL; 414 415 fdb = fdb_find(head, addr, vid); 416 if (fdb) { 417 /* it is okay to have multiple ports with same 418 * address, just use the first one. 419 */ 420 if (fdb->is_local) 421 return 0; 422 br_warn(br, "adding interface %s with same address " 423 "as a received packet\n", 424 source ? source->dev->name : br->dev->name); 425 fdb_delete(br, fdb); 426 } 427 428 fdb = fdb_create(head, source, addr, vid); 429 if (!fdb) 430 return -ENOMEM; 431 432 fdb->is_local = fdb->is_static = 1; 433 fdb_notify(br, fdb, RTM_NEWNEIGH); 434 return 0; 435} 436 437/* Add entry for local address of interface */ 438int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 439 const unsigned char *addr, u16 vid) 440{ 441 int ret; 442 443 spin_lock_bh(&br->hash_lock); 444 ret = fdb_insert(br, source, addr, vid); 445 spin_unlock_bh(&br->hash_lock); 446 return ret; 447} 448 449void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 450 const unsigned char *addr, u16 vid) 451{ 452 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; 453 struct net_bridge_fdb_entry *fdb; 454 455 /* some users want to always flood. */ 456 if (hold_time(br) == 0) 457 return; 458 459 /* ignore packets unless we are using this port */ 460 if (!(source->state == BR_STATE_LEARNING || 461 source->state == BR_STATE_FORWARDING)) 462 return; 463 464 fdb = fdb_find_rcu(head, addr, vid); 465 if (likely(fdb)) { 466 /* attempt to update an entry for a local interface */ 467 if (unlikely(fdb->is_local)) { 468 if (net_ratelimit()) 469 br_warn(br, "received packet on %s with " 470 "own address as source address\n", 471 source->dev->name); 472 } else { 473 /* fastpath: update of existing entry */ 474 fdb->dst = source; 475 fdb->updated = jiffies; 476 } 477 } else { 478 spin_lock(&br->hash_lock); 479 if (likely(!fdb_find(head, addr, vid))) { 480 fdb = fdb_create(head, source, addr, vid); 481 if (fdb) 482 fdb_notify(br, fdb, RTM_NEWNEIGH); 483 } 484 /* else we lose race and someone else inserts 485 * it first, don't bother updating 486 */ 487 spin_unlock(&br->hash_lock); 488 } 489} 490 491static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb) 492{ 493 if (fdb->is_local) 494 return NUD_PERMANENT; 495 else if (fdb->is_static) 496 return NUD_NOARP; 497 else if (has_expired(fdb->dst->br, fdb)) 498 return NUD_STALE; 499 else 500 return NUD_REACHABLE; 501} 502 503static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br, 504 const struct net_bridge_fdb_entry *fdb, 505 u32 portid, u32 seq, int type, unsigned int flags) 506{ 507 unsigned long now = jiffies; 508 struct nda_cacheinfo ci; 509 struct nlmsghdr *nlh; 510 struct ndmsg *ndm; 511 512 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); 513 if (nlh == NULL) 514 return -EMSGSIZE; 515 516 ndm = nlmsg_data(nlh); 517 ndm->ndm_family = AF_BRIDGE; 518 ndm->ndm_pad1 = 0; 519 ndm->ndm_pad2 = 0; 520 ndm->ndm_flags = 0; 521 ndm->ndm_type = 0; 522 ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex; 523 ndm->ndm_state = fdb_to_nud(fdb); 524 525 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr)) 526 goto nla_put_failure; 527 ci.ndm_used = jiffies_to_clock_t(now - fdb->used); 528 ci.ndm_confirmed = 0; 529 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); 530 ci.ndm_refcnt = 0; 531 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) 532 goto nla_put_failure; 533 534 if (nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id)) 535 goto nla_put_failure; 536 537 return nlmsg_end(skb, nlh); 538 539nla_put_failure: 540 nlmsg_cancel(skb, nlh); 541 return -EMSGSIZE; 542} 543 544static inline size_t fdb_nlmsg_size(void) 545{ 546 return NLMSG_ALIGN(sizeof(struct ndmsg)) 547 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ 548 + nla_total_size(sizeof(u16)) /* NDA_VLAN */ 549 + nla_total_size(sizeof(struct nda_cacheinfo)); 550} 551 552static void fdb_notify(struct net_bridge *br, 553 const struct net_bridge_fdb_entry *fdb, int type) 554{ 555 struct net *net = dev_net(br->dev); 556 struct sk_buff *skb; 557 int err = -ENOBUFS; 558 559 skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC); 560 if (skb == NULL) 561 goto errout; 562 563 err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0); 564 if (err < 0) { 565 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */ 566 WARN_ON(err == -EMSGSIZE); 567 kfree_skb(skb); 568 goto errout; 569 } 570 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 571 return; 572errout: 573 if (err < 0) 574 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 575} 576 577/* Dump information about entries, in response to GETNEIGH */ 578int br_fdb_dump(struct sk_buff *skb, 579 struct netlink_callback *cb, 580 struct net_device *dev, 581 int idx) 582{ 583 struct net_bridge *br = netdev_priv(dev); 584 int i; 585 586 if (!(dev->priv_flags & IFF_EBRIDGE)) 587 goto out; 588 589 for (i = 0; i < BR_HASH_SIZE; i++) { 590 struct net_bridge_fdb_entry *f; 591 592 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) { 593 if (idx < cb->args[0]) 594 goto skip; 595 596 if (fdb_fill_info(skb, br, f, 597 NETLINK_CB(cb->skb).portid, 598 cb->nlh->nlmsg_seq, 599 RTM_NEWNEIGH, 600 NLM_F_MULTI) < 0) 601 break; 602skip: 603 ++idx; 604 } 605 } 606 607out: 608 return idx; 609} 610 611/* Update (create or replace) forwarding database entry */ 612static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr, 613 __u16 state, __u16 flags, __u16 vid) 614{ 615 struct net_bridge *br = source->br; 616 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; 617 struct net_bridge_fdb_entry *fdb; 618 bool modified = false; 619 620 fdb = fdb_find(head, addr, vid); 621 if (fdb == NULL) { 622 if (!(flags & NLM_F_CREATE)) 623 return -ENOENT; 624 625 fdb = fdb_create(head, source, addr, vid); 626 if (!fdb) 627 return -ENOMEM; 628 629 modified = true; 630 } else { 631 if (flags & NLM_F_EXCL) 632 return -EEXIST; 633 634 if (fdb->dst != source) { 635 fdb->dst = source; 636 modified = true; 637 } 638 } 639 640 if (fdb_to_nud(fdb) != state) { 641 if (state & NUD_PERMANENT) 642 fdb->is_local = fdb->is_static = 1; 643 else if (state & NUD_NOARP) { 644 fdb->is_local = 0; 645 fdb->is_static = 1; 646 } else 647 fdb->is_local = fdb->is_static = 0; 648 649 modified = true; 650 } 651 652 fdb->used = jiffies; 653 if (modified) { 654 fdb->updated = jiffies; 655 fdb_notify(br, fdb, RTM_NEWNEIGH); 656 } 657 658 return 0; 659} 660 661static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p, 662 const unsigned char *addr, u16 nlh_flags, u16 vid) 663{ 664 int err = 0; 665 666 if (ndm->ndm_flags & NTF_USE) { 667 rcu_read_lock(); 668 br_fdb_update(p->br, p, addr, vid); 669 rcu_read_unlock(); 670 } else { 671 spin_lock_bh(&p->br->hash_lock); 672 err = fdb_add_entry(p, addr, ndm->ndm_state, 673 nlh_flags, vid); 674 spin_unlock_bh(&p->br->hash_lock); 675 } 676 677 return err; 678} 679 680/* Add new permanent fdb entry with RTM_NEWNEIGH */ 681int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 682 struct net_device *dev, 683 const unsigned char *addr, u16 nlh_flags) 684{ 685 struct net_bridge_port *p; 686 int err = 0; 687 struct net_port_vlans *pv; 688 unsigned short vid = VLAN_N_VID; 689 690 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) { 691 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state); 692 return -EINVAL; 693 } 694 695 if (tb[NDA_VLAN]) { 696 if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) { 697 pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n"); 698 return -EINVAL; 699 } 700 701 vid = nla_get_u16(tb[NDA_VLAN]); 702 703 if (vid >= VLAN_N_VID) { 704 pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n", 705 vid); 706 return -EINVAL; 707 } 708 } 709 710 p = br_port_get_rtnl(dev); 711 if (p == NULL) { 712 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n", 713 dev->name); 714 return -EINVAL; 715 } 716 717 pv = nbp_get_vlan_info(p); 718 if (vid != VLAN_N_VID) { 719 if (!pv || !test_bit(vid, pv->vlan_bitmap)) { 720 pr_info("bridge: RTM_NEWNEIGH with unconfigured " 721 "vlan %d on port %s\n", vid, dev->name); 722 return -EINVAL; 723 } 724 725 /* VID was specified, so use it. */ 726 err = __br_fdb_add(ndm, p, addr, nlh_flags, vid); 727 } else { 728 if (!pv || bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN)) { 729 err = __br_fdb_add(ndm, p, addr, nlh_flags, 0); 730 goto out; 731 } 732 733 /* We have vlans configured on this port and user didn't 734 * specify a VLAN. To be nice, add/update entry for every 735 * vlan on this port. 736 */ 737 for_each_set_bit(vid, pv->vlan_bitmap, BR_VLAN_BITMAP_LEN) { 738 err = __br_fdb_add(ndm, p, addr, nlh_flags, vid); 739 if (err) 740 goto out; 741 } 742 } 743 744out: 745 return err; 746} 747 748int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, 749 u16 vlan) 750{ 751 struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)]; 752 struct net_bridge_fdb_entry *fdb; 753 754 fdb = fdb_find(head, addr, vlan); 755 if (!fdb) 756 return -ENOENT; 757 758 fdb_delete(br, fdb); 759 return 0; 760} 761 762static int __br_fdb_delete(struct net_bridge_port *p, 763 const unsigned char *addr, u16 vid) 764{ 765 int err; 766 767 spin_lock_bh(&p->br->hash_lock); 768 err = fdb_delete_by_addr(p->br, addr, vid); 769 spin_unlock_bh(&p->br->hash_lock); 770 771 return err; 772} 773 774/* Remove neighbor entry with RTM_DELNEIGH */ 775int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 776 struct net_device *dev, 777 const unsigned char *addr) 778{ 779 struct net_bridge_port *p; 780 int err; 781 struct net_port_vlans *pv; 782 unsigned short vid = VLAN_N_VID; 783 784 if (tb[NDA_VLAN]) { 785 if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) { 786 pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n"); 787 return -EINVAL; 788 } 789 790 vid = nla_get_u16(tb[NDA_VLAN]); 791 792 if (vid >= VLAN_N_VID) { 793 pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n", 794 vid); 795 return -EINVAL; 796 } 797 } 798 p = br_port_get_rtnl(dev); 799 if (p == NULL) { 800 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n", 801 dev->name); 802 return -EINVAL; 803 } 804 805 pv = nbp_get_vlan_info(p); 806 if (vid != VLAN_N_VID) { 807 if (!pv || !test_bit(vid, pv->vlan_bitmap)) { 808 pr_info("bridge: RTM_DELNEIGH with unconfigured " 809 "vlan %d on port %s\n", vid, dev->name); 810 return -EINVAL; 811 } 812 813 err = __br_fdb_delete(p, addr, vid); 814 } else { 815 if (!pv || bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN)) { 816 err = __br_fdb_delete(p, addr, 0); 817 goto out; 818 } 819 820 /* We have vlans configured on this port and user didn't 821 * specify a VLAN. To be nice, add/update entry for every 822 * vlan on this port. 823 */ 824 err = -ENOENT; 825 for_each_set_bit(vid, pv->vlan_bitmap, BR_VLAN_BITMAP_LEN) { 826 err &= __br_fdb_delete(p, addr, vid); 827 } 828 } 829out: 830 return err; 831} 832