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rds: simplify a warning message
[linux-2.6.git] / net / bridge / br_fdb.c
blob8117900af4de988a222a12cb49ab1c6d2832f445
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
29 static struct kmem_cache *br_fdb_cache __read_mostly;
30 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
31 const unsigned char *addr, u16 vid);
32 static void fdb_notify(struct net_bridge *br,
33 const struct net_bridge_fdb_entry *, int);
34
35 static u32 fdb_salt __read_mostly;
36
37 int __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
50 void 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 */
59 static inline unsigned long hold_time(const struct net_bridge *br)
60 {
61 return br->topology_change ? br->forward_delay : br->ageing_time;
62 }
63
64 static 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
71 static 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
78 static 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
85 static 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
92 void 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);
123 insert:
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
139 done:
140 spin_unlock_bh(&br->hash_lock);
141 }
142
143 void 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 (vid = find_next_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN, vid);
165 vid < BR_VLAN_BITMAP_LEN;
166 vid = find_next_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN, vid+1)) {
167 f = __br_fdb_get(br, br->dev->dev_addr, vid);
168 if (f && f->is_local && !f->dst)
169 fdb_delete(br, f);
170 fdb_insert(br, NULL, newaddr, vid);
171 }
172 }
173
174 void br_fdb_cleanup(unsigned long _data)
175 {
176 struct net_bridge *br = (struct net_bridge *)_data;
177 unsigned long delay = hold_time(br);
178 unsigned long next_timer = jiffies + br->ageing_time;
179 int i;
180
181 spin_lock(&br->hash_lock);
182 for (i = 0; i < BR_HASH_SIZE; i++) {
183 struct net_bridge_fdb_entry *f;
184 struct hlist_node *h, *n;
185
186 hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
187 unsigned long this_timer;
188 if (f->is_static)
189 continue;
190 this_timer = f->updated + delay;
191 if (time_before_eq(this_timer, jiffies))
192 fdb_delete(br, f);
193 else if (time_before(this_timer, next_timer))
194 next_timer = this_timer;
195 }
196 }
197 spin_unlock(&br->hash_lock);
198
199 mod_timer(&br->gc_timer, round_jiffies_up(next_timer));
200 }
201
202 /* Completely flush all dynamic entries in forwarding database.*/
203 void br_fdb_flush(struct net_bridge *br)
204 {
205 int i;
206
207 spin_lock_bh(&br->hash_lock);
208 for (i = 0; i < BR_HASH_SIZE; i++) {
209 struct net_bridge_fdb_entry *f;
210 struct hlist_node *h, *n;
211 hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
212 if (!f->is_static)
213 fdb_delete(br, f);
214 }
215 }
216 spin_unlock_bh(&br->hash_lock);
217 }
218
219 /* Flush all entries referring to a specific port.
220 * if do_all is set also flush static entries
221 */
222 void br_fdb_delete_by_port(struct net_bridge *br,
223 const struct net_bridge_port *p,
224 int do_all)
225 {
226 int i;
227
228 spin_lock_bh(&br->hash_lock);
229 for (i = 0; i < BR_HASH_SIZE; i++) {
230 struct hlist_node *h, *g;
231
232 hlist_for_each_safe(h, g, &br->hash[i]) {
233 struct net_bridge_fdb_entry *f
234 = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
235 if (f->dst != p)
236 continue;
237
238 if (f->is_static && !do_all)
239 continue;
240 /*
241 * if multiple ports all have the same device address
242 * then when one port is deleted, assign
243 * the local entry to other port
244 */
245 if (f->is_local) {
246 struct net_bridge_port *op;
247 list_for_each_entry(op, &br->port_list, list) {
248 if (op != p &&
249 ether_addr_equal(op->dev->dev_addr,
250 f->addr.addr)) {
251 f->dst = op;
252 goto skip_delete;
253 }
254 }
255 }
256
257 fdb_delete(br, f);
258 skip_delete: ;
259 }
260 }
261 spin_unlock_bh(&br->hash_lock);
262 }
263
264 /* No locking or refcounting, assumes caller has rcu_read_lock */
265 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
266 const unsigned char *addr,
267 __u16 vid)
268 {
269 struct hlist_node *h;
270 struct net_bridge_fdb_entry *fdb;
271
272 hlist_for_each_entry_rcu(fdb, h,
273 &br->hash[br_mac_hash(addr, vid)], hlist) {
274 if (ether_addr_equal(fdb->addr.addr, addr) &&
275 fdb->vlan_id == vid) {
276 if (unlikely(has_expired(br, fdb)))
277 break;
278 return fdb;
279 }
280 }
281
282 return NULL;
283 }
284
285 #if IS_ENABLED(CONFIG_ATM_LANE)
286 /* Interface used by ATM LANE hook to test
287 * if an addr is on some other bridge port */
288 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
289 {
290 struct net_bridge_fdb_entry *fdb;
291 struct net_bridge_port *port;
292 int ret;
293
294 rcu_read_lock();
295 port = br_port_get_rcu(dev);
296 if (!port)
297 ret = 0;
298 else {
299 fdb = __br_fdb_get(port->br, addr, 0);
300 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
301 fdb->dst->state == BR_STATE_FORWARDING;
302 }
303 rcu_read_unlock();
304
305 return ret;
306 }
307 #endif /* CONFIG_ATM_LANE */
308
309 /*
310 * Fill buffer with forwarding table records in
311 * the API format.
312 */
313 int br_fdb_fillbuf(struct net_bridge *br, void *buf,
314 unsigned long maxnum, unsigned long skip)
315 {
316 struct __fdb_entry *fe = buf;
317 int i, num = 0;
318 struct hlist_node *h;
319 struct net_bridge_fdb_entry *f;
320
321 memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
322
323 rcu_read_lock();
324 for (i = 0; i < BR_HASH_SIZE; i++) {
325 hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
326 if (num >= maxnum)
327 goto out;
328
329 if (has_expired(br, f))
330 continue;
331
332 /* ignore pseudo entry for local MAC address */
333 if (!f->dst)
334 continue;
335
336 if (skip) {
337 --skip;
338 continue;
339 }
340
341 /* convert from internal format to API */
342 memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
343
344 /* due to ABI compat need to split into hi/lo */
345 fe->port_no = f->dst->port_no;
346 fe->port_hi = f->dst->port_no >> 8;
347
348 fe->is_local = f->is_local;
349 if (!f->is_static)
350 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
351 ++fe;
352 ++num;
353 }
354 }
355
356 out:
357 rcu_read_unlock();
358
359 return num;
360 }
361
362 static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
363 const unsigned char *addr,
364 __u16 vid)
365 {
366 struct hlist_node *h;
367 struct net_bridge_fdb_entry *fdb;
368
369 hlist_for_each_entry(fdb, h, head, hlist) {
370 if (ether_addr_equal(fdb->addr.addr, addr) &&
371 fdb->vlan_id == vid)
372 return fdb;
373 }
374 return NULL;
375 }
376
377 static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
378 const unsigned char *addr,
379 __u16 vid)
380 {
381 struct hlist_node *h;
382 struct net_bridge_fdb_entry *fdb;
383
384 hlist_for_each_entry_rcu(fdb, h, head, hlist) {
385 if (ether_addr_equal(fdb->addr.addr, addr) &&
386 fdb->vlan_id == vid)
387 return fdb;
388 }
389 return NULL;
390 }
391
392 static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
393 struct net_bridge_port *source,
394 const unsigned char *addr,
395 __u16 vid)
396 {
397 struct net_bridge_fdb_entry *fdb;
398
399 fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
400 if (fdb) {
401 memcpy(fdb->addr.addr, addr, ETH_ALEN);
402 fdb->dst = source;
403 fdb->vlan_id = vid;
404 fdb->is_local = 0;
405 fdb->is_static = 0;
406 fdb->updated = fdb->used = jiffies;
407 hlist_add_head_rcu(&fdb->hlist, head);
408 }
409 return fdb;
410 }
411
412 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
413 const unsigned char *addr, u16 vid)
414 {
415 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
416 struct net_bridge_fdb_entry *fdb;
417
418 if (!is_valid_ether_addr(addr))
419 return -EINVAL;
420
421 fdb = fdb_find(head, addr, vid);
422 if (fdb) {
423 /* it is okay to have multiple ports with same
424 * address, just use the first one.
425 */
426 if (fdb->is_local)
427 return 0;
428 br_warn(br, "adding interface %s with same address "
429 "as a received packet\n",
430 source->dev->name);
431 fdb_delete(br, fdb);
432 }
433
434 fdb = fdb_create(head, source, addr, vid);
435 if (!fdb)
436 return -ENOMEM;
437
438 fdb->is_local = fdb->is_static = 1;
439 fdb_notify(br, fdb, RTM_NEWNEIGH);
440 return 0;
441 }
442
443 /* Add entry for local address of interface */
444 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
445 const unsigned char *addr, u16 vid)
446 {
447 int ret;
448
449 spin_lock_bh(&br->hash_lock);
450 ret = fdb_insert(br, source, addr, vid);
451 spin_unlock_bh(&br->hash_lock);
452 return ret;
453 }
454
455 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
456 const unsigned char *addr, u16 vid)
457 {
458 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
459 struct net_bridge_fdb_entry *fdb;
460
461 /* some users want to always flood. */
462 if (hold_time(br) == 0)
463 return;
464
465 /* ignore packets unless we are using this port */
466 if (!(source->state == BR_STATE_LEARNING ||
467 source->state == BR_STATE_FORWARDING))
468 return;
469
470 fdb = fdb_find_rcu(head, addr, vid);
471 if (likely(fdb)) {
472 /* attempt to update an entry for a local interface */
473 if (unlikely(fdb->is_local)) {
474 if (net_ratelimit())
475 br_warn(br, "received packet on %s with "
476 "own address as source address\n",
477 source->dev->name);
478 } else {
479 /* fastpath: update of existing entry */
480 fdb->dst = source;
481 fdb->updated = jiffies;
482 }
483 } else {
484 spin_lock(&br->hash_lock);
485 if (likely(!fdb_find(head, addr, vid))) {
486 fdb = fdb_create(head, source, addr, vid);
487 if (fdb)
488 fdb_notify(br, fdb, RTM_NEWNEIGH);
489 }
490 /* else we lose race and someone else inserts
491 * it first, don't bother updating
492 */
493 spin_unlock(&br->hash_lock);
494 }
495 }
496
497 static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb)
498 {
499 if (fdb->is_local)
500 return NUD_PERMANENT;
501 else if (fdb->is_static)
502 return NUD_NOARP;
503 else if (has_expired(fdb->dst->br, fdb))
504 return NUD_STALE;
505 else
506 return NUD_REACHABLE;
507 }
508
509 static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
510 const struct net_bridge_fdb_entry *fdb,
511 u32 portid, u32 seq, int type, unsigned int flags)
512 {
513 unsigned long now = jiffies;
514 struct nda_cacheinfo ci;
515 struct nlmsghdr *nlh;
516 struct ndmsg *ndm;
517
518 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
519 if (nlh == NULL)
520 return -EMSGSIZE;
521
522 ndm = nlmsg_data(nlh);
523 ndm->ndm_family = AF_BRIDGE;
524 ndm->ndm_pad1 = 0;
525 ndm->ndm_pad2 = 0;
526 ndm->ndm_flags = 0;
527 ndm->ndm_type = 0;
528 ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
529 ndm->ndm_state = fdb_to_nud(fdb);
530
531 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr))
532 goto nla_put_failure;
533 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
534 ci.ndm_confirmed = 0;
535 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
536 ci.ndm_refcnt = 0;
537 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
538 goto nla_put_failure;
539
540 if (nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id))
541 goto nla_put_failure;
542
543 return nlmsg_end(skb, nlh);
544
545 nla_put_failure:
546 nlmsg_cancel(skb, nlh);
547 return -EMSGSIZE;
548 }
549
550 static inline size_t fdb_nlmsg_size(void)
551 {
552 return NLMSG_ALIGN(sizeof(struct ndmsg))
553 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
554 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
555 + nla_total_size(sizeof(struct nda_cacheinfo));
556 }
557
558 static void fdb_notify(struct net_bridge *br,
559 const struct net_bridge_fdb_entry *fdb, int type)
560 {
561 struct net *net = dev_net(br->dev);
562 struct sk_buff *skb;
563 int err = -ENOBUFS;
564
565 skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
566 if (skb == NULL)
567 goto errout;
568
569 err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
570 if (err < 0) {
571 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
572 WARN_ON(err == -EMSGSIZE);
573 kfree_skb(skb);
574 goto errout;
575 }
576 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
577 return;
578 errout:
579 if (err < 0)
580 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
581 }
582
583 /* Dump information about entries, in response to GETNEIGH */
584 int br_fdb_dump(struct sk_buff *skb,
585 struct netlink_callback *cb,
586 struct net_device *dev,
587 int idx)
588 {
589 struct net_bridge *br = netdev_priv(dev);
590 int i;
591
592 if (!(dev->priv_flags & IFF_EBRIDGE))
593 goto out;
594
595 for (i = 0; i < BR_HASH_SIZE; i++) {
596 struct hlist_node *h;
597 struct net_bridge_fdb_entry *f;
598
599 hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
600 if (idx < cb->args[0])
601 goto skip;
602
603 if (fdb_fill_info(skb, br, f,
604 NETLINK_CB(cb->skb).portid,
605 cb->nlh->nlmsg_seq,
606 RTM_NEWNEIGH,
607 NLM_F_MULTI) < 0)
608 break;
609 skip:
610 ++idx;
611 }
612 }
613
614 out:
615 return idx;
616 }
617
618 /* Update (create or replace) forwarding database entry */
619 static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
620 __u16 state, __u16 flags, __u16 vid)
621 {
622 struct net_bridge *br = source->br;
623 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
624 struct net_bridge_fdb_entry *fdb;
625
626 fdb = fdb_find(head, addr, vid);
627 if (fdb == NULL) {
628 if (!(flags & NLM_F_CREATE))
629 return -ENOENT;
630
631 fdb = fdb_create(head, source, addr, vid);
632 if (!fdb)
633 return -ENOMEM;
634 fdb_notify(br, fdb, RTM_NEWNEIGH);
635 } else {
636 if (flags & NLM_F_EXCL)
637 return -EEXIST;
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 fdb->updated = fdb->used = jiffies;
650 fdb_notify(br, fdb, RTM_NEWNEIGH);
651 }
652
653 return 0;
654 }
655
656 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p,
657 const unsigned char *addr, u16 nlh_flags, u16 vid)
658 {
659 int err = 0;
660
661 if (ndm->ndm_flags & NTF_USE) {
662 rcu_read_lock();
663 br_fdb_update(p->br, p, addr, vid);
664 rcu_read_unlock();
665 } else {
666 spin_lock_bh(&p->br->hash_lock);
667 err = fdb_add_entry(p, addr, ndm->ndm_state,
668 nlh_flags, vid);
669 spin_unlock_bh(&p->br->hash_lock);
670 }
671
672 return err;
673 }
674
675 /* Add new permanent fdb entry with RTM_NEWNEIGH */
676 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
677 struct net_device *dev,
678 const unsigned char *addr, u16 nlh_flags)
679 {
680 struct net_bridge_port *p;
681 int err = 0;
682 struct net_port_vlans *pv;
683 unsigned short vid = VLAN_N_VID;
684
685 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
686 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
687 return -EINVAL;
688 }
689
690 if (tb[NDA_VLAN]) {
691 if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) {
692 pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n");
693 return -EINVAL;
694 }
695
696 vid = nla_get_u16(tb[NDA_VLAN]);
697
698 if (vid >= VLAN_N_VID) {
699 pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n",
700 vid);
701 return -EINVAL;
702 }
703 }
704
705 p = br_port_get_rtnl(dev);
706 if (p == NULL) {
707 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
708 dev->name);
709 return -EINVAL;
710 }
711
712 pv = nbp_get_vlan_info(p);
713 if (vid != VLAN_N_VID) {
714 if (!pv || !test_bit(vid, pv->vlan_bitmap)) {
715 pr_info("bridge: RTM_NEWNEIGH with unconfigured "
716 "vlan %d on port %s\n", vid, dev->name);
717 return -EINVAL;
718 }
719
720 /* VID was specified, so use it. */
721 err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
722 } else {
723 if (!pv || bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN)) {
724 err = __br_fdb_add(ndm, p, addr, nlh_flags, 0);
725 goto out;
726 }
727
728 /* We have vlans configured on this port and user didn't
729 * specify a VLAN. To be nice, add/update entry for every
730 * vlan on this port.
731 */
732 vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN);
733 while (vid < BR_VLAN_BITMAP_LEN) {
734 err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
735 if (err)
736 goto out;
737 vid = find_next_bit(pv->vlan_bitmap,
738 BR_VLAN_BITMAP_LEN, vid+1);
739 }
740 }
741
742 out:
743 return err;
744 }
745
746 int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr,
747 u16 vlan)
748 {
749 struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)];
750 struct net_bridge_fdb_entry *fdb;
751
752 fdb = fdb_find(head, addr, vlan);
753 if (!fdb)
754 return -ENOENT;
755
756 fdb_delete(br, fdb);
757 return 0;
758 }
759
760 static int __br_fdb_delete(struct net_bridge_port *p,
761 const unsigned char *addr, u16 vid)
762 {
763 int err;
764
765 spin_lock_bh(&p->br->hash_lock);
766 err = fdb_delete_by_addr(p->br, addr, vid);
767 spin_unlock_bh(&p->br->hash_lock);
768
769 return err;
770 }
771
772 /* Remove neighbor entry with RTM_DELNEIGH */
773 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
774 struct net_device *dev,
775 const unsigned char *addr)
776 {
777 struct net_bridge_port *p;
778 int err;
779 struct net_port_vlans *pv;
780 unsigned short vid = VLAN_N_VID;
781
782 if (tb[NDA_VLAN]) {
783 if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) {
784 pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n");
785 return -EINVAL;
786 }
787
788 vid = nla_get_u16(tb[NDA_VLAN]);
789
790 if (vid >= VLAN_N_VID) {
791 pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n",
792 vid);
793 return -EINVAL;
794 }
795 }
796 p = br_port_get_rtnl(dev);
797 if (p == NULL) {
798 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
799 dev->name);
800 return -EINVAL;
801 }
802
803 pv = nbp_get_vlan_info(p);
804 if (vid != VLAN_N_VID) {
805 if (!pv || !test_bit(vid, pv->vlan_bitmap)) {
806 pr_info("bridge: RTM_DELNEIGH with unconfigured "
807 "vlan %d on port %s\n", vid, dev->name);
808 return -EINVAL;
809 }
810
811 err = __br_fdb_delete(p, addr, vid);
812 } else {
813 if (!pv || bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN)) {
814 err = __br_fdb_delete(p, addr, 0);
815 goto out;
816 }
817
818 /* We have vlans configured on this port and user didn't
819 * specify a VLAN. To be nice, add/update entry for every
820 * vlan on this port.
821 */
822 err = -ENOENT;
823 vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN);
824 while (vid < BR_VLAN_BITMAP_LEN) {
825 err &= __br_fdb_delete(p, addr, vid);
826 vid = find_next_bit(pv->vlan_bitmap,
827 BR_VLAN_BITMAP_LEN, vid+1);
828 }
829 }
830 out:
831 return err;
832 }
Linus' kernel tree