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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 <asm/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
27static 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
34static struct kmem_cache *br_fdb_cache __read_mostly;
35static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
36 const unsigned char *addr, u16 vid);
37static void fdb_notify(struct net_bridge *br,
38 const struct net_bridge_fdb_entry *, int, bool);
39
40int __init br_fdb_init(void)
41{
42 br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
43 sizeof(struct net_bridge_fdb_entry),
44 0,
45 SLAB_HWCACHE_ALIGN, NULL);
46 if (!br_fdb_cache)
47 return -ENOMEM;
48
49 return 0;
50}
51
52void br_fdb_fini(void)
53{
54 kmem_cache_destroy(br_fdb_cache);
55}
56
57int br_fdb_hash_init(struct net_bridge *br)
58{
59 return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params);
60}
61
62void br_fdb_hash_fini(struct net_bridge *br)
63{
64 rhashtable_destroy(&br->fdb_hash_tbl);
65}
66
67/* if topology_changing then use forward_delay (default 15 sec)
68 * otherwise keep longer (default 5 minutes)
69 */
70static inline unsigned long hold_time(const struct net_bridge *br)
71{
72 return br->topology_change ? br->forward_delay : br->ageing_time;
73}
74
75static inline int has_expired(const struct net_bridge *br,
76 const struct net_bridge_fdb_entry *fdb)
77{
78 return !fdb->is_static && !fdb->added_by_external_learn &&
79 time_before_eq(fdb->updated + hold_time(br), jiffies);
80}
81
82static void fdb_rcu_free(struct rcu_head *head)
83{
84 struct net_bridge_fdb_entry *ent
85 = container_of(head, struct net_bridge_fdb_entry, rcu);
86 kmem_cache_free(br_fdb_cache, ent);
87}
88
89static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl,
90 const unsigned char *addr,
91 __u16 vid)
92{
93 struct net_bridge_fdb_key key;
94
95 WARN_ON_ONCE(!rcu_read_lock_held());
96
97 key.vlan_id = vid;
98 memcpy(key.addr.addr, addr, sizeof(key.addr.addr));
99
100 return rhashtable_lookup(tbl, &key, br_fdb_rht_params);
101}
102
103/* requires bridge hash_lock */
104static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br,
105 const unsigned char *addr,
106 __u16 vid)
107{
108 struct net_bridge_fdb_entry *fdb;
109
110 lockdep_assert_held_once(&br->hash_lock);
111
112 rcu_read_lock();
113 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
114 rcu_read_unlock();
115
116 return fdb;
117}
118
119struct net_device *br_fdb_find_port(const struct net_device *br_dev,
120 const unsigned char *addr,
121 __u16 vid)
122{
123 struct net_bridge_fdb_entry *f;
124 struct net_device *dev = NULL;
125 struct net_bridge *br;
126
127 ASSERT_RTNL();
128
129 if (!netif_is_bridge_master(br_dev))
130 return NULL;
131
132 br = netdev_priv(br_dev);
133 rcu_read_lock();
134 f = br_fdb_find_rcu(br, addr, vid);
135 if (f && f->dst)
136 dev = f->dst->dev;
137 rcu_read_unlock();
138
139 return dev;
140}
141EXPORT_SYMBOL_GPL(br_fdb_find_port);
142
143struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
144 const unsigned char *addr,
145 __u16 vid)
146{
147 return fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
148}
149
150/* When a static FDB entry is added, the mac address from the entry is
151 * added to the bridge private HW address list and all required ports
152 * are then updated with the new information.
153 * Called under RTNL.
154 */
155static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr)
156{
157 int err;
158 struct net_bridge_port *p;
159
160 ASSERT_RTNL();
161
162 list_for_each_entry(p, &br->port_list, list) {
163 if (!br_promisc_port(p)) {
164 err = dev_uc_add(p->dev, addr);
165 if (err)
166 goto undo;
167 }
168 }
169
170 return;
171undo:
172 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
173 if (!br_promisc_port(p))
174 dev_uc_del(p->dev, addr);
175 }
176}
177
178/* When a static FDB entry is deleted, the HW address from that entry is
179 * also removed from the bridge private HW address list and updates all
180 * the ports with needed information.
181 * Called under RTNL.
182 */
183static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
184{
185 struct net_bridge_port *p;
186
187 ASSERT_RTNL();
188
189 list_for_each_entry(p, &br->port_list, list) {
190 if (!br_promisc_port(p))
191 dev_uc_del(p->dev, addr);
192 }
193}
194
195static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f,
196 bool swdev_notify)
197{
198 trace_fdb_delete(br, f);
199
200 if (f->is_static)
201 fdb_del_hw_addr(br, f->key.addr.addr);
202
203 hlist_del_init_rcu(&f->fdb_node);
204 rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode,
205 br_fdb_rht_params);
206 fdb_notify(br, f, RTM_DELNEIGH, swdev_notify);
207 call_rcu(&f->rcu, fdb_rcu_free);
208}
209
210/* Delete a local entry if no other port had the same address. */
211static void fdb_delete_local(struct net_bridge *br,
212 const struct net_bridge_port *p,
213 struct net_bridge_fdb_entry *f)
214{
215 const unsigned char *addr = f->key.addr.addr;
216 struct net_bridge_vlan_group *vg;
217 const struct net_bridge_vlan *v;
218 struct net_bridge_port *op;
219 u16 vid = f->key.vlan_id;
220
221 /* Maybe another port has same hw addr? */
222 list_for_each_entry(op, &br->port_list, list) {
223 vg = nbp_vlan_group(op);
224 if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
225 (!vid || br_vlan_find(vg, vid))) {
226 f->dst = op;
227 f->added_by_user = 0;
228 return;
229 }
230 }
231
232 vg = br_vlan_group(br);
233 v = br_vlan_find(vg, vid);
234 /* Maybe bridge device has same hw addr? */
235 if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
236 (!vid || (v && br_vlan_should_use(v)))) {
237 f->dst = NULL;
238 f->added_by_user = 0;
239 return;
240 }
241
242 fdb_delete(br, f, true);
243}
244
245void br_fdb_find_delete_local(struct net_bridge *br,
246 const struct net_bridge_port *p,
247 const unsigned char *addr, u16 vid)
248{
249 struct net_bridge_fdb_entry *f;
250
251 spin_lock_bh(&br->hash_lock);
252 f = br_fdb_find(br, addr, vid);
253 if (f && f->is_local && !f->added_by_user && f->dst == p)
254 fdb_delete_local(br, p, f);
255 spin_unlock_bh(&br->hash_lock);
256}
257
258void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
259{
260 struct net_bridge_vlan_group *vg;
261 struct net_bridge_fdb_entry *f;
262 struct net_bridge *br = p->br;
263 struct net_bridge_vlan *v;
264
265 spin_lock_bh(&br->hash_lock);
266 vg = nbp_vlan_group(p);
267 hlist_for_each_entry(f, &br->fdb_list, fdb_node) {
268 if (f->dst == p && f->is_local && !f->added_by_user) {
269 /* delete old one */
270 fdb_delete_local(br, p, f);
271
272 /* if this port has no vlan information
273 * configured, we can safely be done at
274 * this point.
275 */
276 if (!vg || !vg->num_vlans)
277 goto insert;
278 }
279 }
280
281insert:
282 /* insert new address, may fail if invalid address or dup. */
283 fdb_insert(br, p, newaddr, 0);
284
285 if (!vg || !vg->num_vlans)
286 goto done;
287
288 /* Now add entries for every VLAN configured on the port.
289 * This function runs under RTNL so the bitmap will not change
290 * from under us.
291 */
292 list_for_each_entry(v, &vg->vlan_list, vlist)
293 fdb_insert(br, p, newaddr, v->vid);
294
295done:
296 spin_unlock_bh(&br->hash_lock);
297}
298
299void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
300{
301 struct net_bridge_vlan_group *vg;
302 struct net_bridge_fdb_entry *f;
303 struct net_bridge_vlan *v;
304
305 spin_lock_bh(&br->hash_lock);
306
307 /* If old entry was unassociated with any port, then delete it. */
308 f = br_fdb_find(br, br->dev->dev_addr, 0);
309 if (f && f->is_local && !f->dst && !f->added_by_user)
310 fdb_delete_local(br, NULL, f);
311
312 fdb_insert(br, NULL, newaddr, 0);
313 vg = br_vlan_group(br);
314 if (!vg || !vg->num_vlans)
315 goto out;
316 /* Now remove and add entries for every VLAN configured on the
317 * bridge. This function runs under RTNL so the bitmap will not
318 * change from under us.
319 */
320 list_for_each_entry(v, &vg->vlan_list, vlist) {
321 if (!br_vlan_should_use(v))
322 continue;
323 f = br_fdb_find(br, br->dev->dev_addr, v->vid);
324 if (f && f->is_local && !f->dst && !f->added_by_user)
325 fdb_delete_local(br, NULL, f);
326 fdb_insert(br, NULL, newaddr, v->vid);
327 }
328out:
329 spin_unlock_bh(&br->hash_lock);
330}
331
332void br_fdb_cleanup(struct work_struct *work)
333{
334 struct net_bridge *br = container_of(work, struct net_bridge,
335 gc_work.work);
336 struct net_bridge_fdb_entry *f = NULL;
337 unsigned long delay = hold_time(br);
338 unsigned long work_delay = delay;
339 unsigned long now = jiffies;
340
341 /* this part is tricky, in order to avoid blocking learning and
342 * consequently forwarding, we rely on rcu to delete objects with
343 * delayed freeing allowing us to continue traversing
344 */
345 rcu_read_lock();
346 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
347 unsigned long this_timer;
348
349 if (f->is_static || f->added_by_external_learn)
350 continue;
351 this_timer = f->updated + delay;
352 if (time_after(this_timer, now)) {
353 work_delay = min(work_delay, this_timer - now);
354 } else {
355 spin_lock_bh(&br->hash_lock);
356 if (!hlist_unhashed(&f->fdb_node))
357 fdb_delete(br, f, true);
358 spin_unlock_bh(&br->hash_lock);
359 }
360 }
361 rcu_read_unlock();
362
363 /* Cleanup minimum 10 milliseconds apart */
364 work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10));
365 mod_delayed_work(system_long_wq, &br->gc_work, work_delay);
366}
367
368/* Completely flush all dynamic entries in forwarding database.*/
369void br_fdb_flush(struct net_bridge *br)
370{
371 struct net_bridge_fdb_entry *f;
372 struct hlist_node *tmp;
373
374 spin_lock_bh(&br->hash_lock);
375 hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
376 if (!f->is_static)
377 fdb_delete(br, f, true);
378 }
379 spin_unlock_bh(&br->hash_lock);
380}
381
382/* Flush all entries referring to a specific port.
383 * if do_all is set also flush static entries
384 * if vid is set delete all entries that match the vlan_id
385 */
386void br_fdb_delete_by_port(struct net_bridge *br,
387 const struct net_bridge_port *p,
388 u16 vid,
389 int do_all)
390{
391 struct net_bridge_fdb_entry *f;
392 struct hlist_node *tmp;
393
394 spin_lock_bh(&br->hash_lock);
395 hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
396 if (f->dst != p)
397 continue;
398
399 if (!do_all)
400 if (f->is_static || (vid && f->key.vlan_id != vid))
401 continue;
402
403 if (f->is_local)
404 fdb_delete_local(br, p, f);
405 else
406 fdb_delete(br, f, true);
407 }
408 spin_unlock_bh(&br->hash_lock);
409}
410
411#if IS_ENABLED(CONFIG_ATM_LANE)
412/* Interface used by ATM LANE hook to test
413 * if an addr is on some other bridge port */
414int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
415{
416 struct net_bridge_fdb_entry *fdb;
417 struct net_bridge_port *port;
418 int ret;
419
420 rcu_read_lock();
421 port = br_port_get_rcu(dev);
422 if (!port)
423 ret = 0;
424 else {
425 fdb = br_fdb_find_rcu(port->br, addr, 0);
426 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
427 fdb->dst->state == BR_STATE_FORWARDING;
428 }
429 rcu_read_unlock();
430
431 return ret;
432}
433#endif /* CONFIG_ATM_LANE */
434
435/*
436 * Fill buffer with forwarding table records in
437 * the API format.
438 */
439int br_fdb_fillbuf(struct net_bridge *br, void *buf,
440 unsigned long maxnum, unsigned long skip)
441{
442 struct net_bridge_fdb_entry *f;
443 struct __fdb_entry *fe = buf;
444 int num = 0;
445
446 memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
447
448 rcu_read_lock();
449 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
450 if (num >= maxnum)
451 break;
452
453 if (has_expired(br, f))
454 continue;
455
456 /* ignore pseudo entry for local MAC address */
457 if (!f->dst)
458 continue;
459
460 if (skip) {
461 --skip;
462 continue;
463 }
464
465 /* convert from internal format to API */
466 memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN);
467
468 /* due to ABI compat need to split into hi/lo */
469 fe->port_no = f->dst->port_no;
470 fe->port_hi = f->dst->port_no >> 8;
471
472 fe->is_local = f->is_local;
473 if (!f->is_static)
474 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
475 ++fe;
476 ++num;
477 }
478 rcu_read_unlock();
479
480 return num;
481}
482
483static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
484 struct net_bridge_port *source,
485 const unsigned char *addr,
486 __u16 vid,
487 unsigned char is_local,
488 unsigned char is_static)
489{
490 struct net_bridge_fdb_entry *fdb;
491
492 fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
493 if (fdb) {
494 memcpy(fdb->key.addr.addr, addr, ETH_ALEN);
495 fdb->dst = source;
496 fdb->key.vlan_id = vid;
497 fdb->is_local = is_local;
498 fdb->is_static = is_static;
499 fdb->added_by_user = 0;
500 fdb->added_by_external_learn = 0;
501 fdb->offloaded = 0;
502 fdb->is_sticky = 0;
503 fdb->updated = fdb->used = jiffies;
504 if (rhashtable_lookup_insert_fast(&br->fdb_hash_tbl,
505 &fdb->rhnode,
506 br_fdb_rht_params)) {
507 kmem_cache_free(br_fdb_cache, fdb);
508 fdb = NULL;
509 } else {
510 hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list);
511 }
512 }
513 return fdb;
514}
515
516static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
517 const unsigned char *addr, u16 vid)
518{
519 struct net_bridge_fdb_entry *fdb;
520
521 if (!is_valid_ether_addr(addr))
522 return -EINVAL;
523
524 fdb = br_fdb_find(br, addr, vid);
525 if (fdb) {
526 /* it is okay to have multiple ports with same
527 * address, just use the first one.
528 */
529 if (fdb->is_local)
530 return 0;
531 br_warn(br, "adding interface %s with same address as a received packet (addr:%pM, vlan:%u)\n",
532 source ? source->dev->name : br->dev->name, addr, vid);
533 fdb_delete(br, fdb, true);
534 }
535
536 fdb = fdb_create(br, source, addr, vid, 1, 1);
537 if (!fdb)
538 return -ENOMEM;
539
540 fdb_add_hw_addr(br, addr);
541 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
542 return 0;
543}
544
545/* Add entry for local address of interface */
546int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
547 const unsigned char *addr, u16 vid)
548{
549 int ret;
550
551 spin_lock_bh(&br->hash_lock);
552 ret = fdb_insert(br, source, addr, vid);
553 spin_unlock_bh(&br->hash_lock);
554 return ret;
555}
556
557void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
558 const unsigned char *addr, u16 vid, bool added_by_user)
559{
560 struct net_bridge_fdb_entry *fdb;
561 bool fdb_modified = false;
562
563 /* some users want to always flood. */
564 if (hold_time(br) == 0)
565 return;
566
567 /* ignore packets unless we are using this port */
568 if (!(source->state == BR_STATE_LEARNING ||
569 source->state == BR_STATE_FORWARDING))
570 return;
571
572 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
573 if (likely(fdb)) {
574 /* attempt to update an entry for a local interface */
575 if (unlikely(fdb->is_local)) {
576 if (net_ratelimit())
577 br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n",
578 source->dev->name, addr, vid);
579 } else {
580 unsigned long now = jiffies;
581
582 /* fastpath: update of existing entry */
583 if (unlikely(source != fdb->dst && !fdb->is_sticky)) {
584 fdb->dst = source;
585 fdb_modified = true;
586 /* Take over HW learned entry */
587 if (unlikely(fdb->added_by_external_learn))
588 fdb->added_by_external_learn = 0;
589 }
590 if (now != fdb->updated)
591 fdb->updated = now;
592 if (unlikely(added_by_user))
593 fdb->added_by_user = 1;
594 if (unlikely(fdb_modified)) {
595 trace_br_fdb_update(br, source, addr, vid, added_by_user);
596 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
597 }
598 }
599 } else {
600 spin_lock(&br->hash_lock);
601 fdb = fdb_create(br, source, addr, vid, 0, 0);
602 if (fdb) {
603 if (unlikely(added_by_user))
604 fdb->added_by_user = 1;
605 trace_br_fdb_update(br, source, addr, vid,
606 added_by_user);
607 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
608 }
609 /* else we lose race and someone else inserts
610 * it first, don't bother updating
611 */
612 spin_unlock(&br->hash_lock);
613 }
614}
615
616static int fdb_to_nud(const struct net_bridge *br,
617 const struct net_bridge_fdb_entry *fdb)
618{
619 if (fdb->is_local)
620 return NUD_PERMANENT;
621 else if (fdb->is_static)
622 return NUD_NOARP;
623 else if (has_expired(br, fdb))
624 return NUD_STALE;
625 else
626 return NUD_REACHABLE;
627}
628
629static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
630 const struct net_bridge_fdb_entry *fdb,
631 u32 portid, u32 seq, int type, unsigned int flags)
632{
633 unsigned long now = jiffies;
634 struct nda_cacheinfo ci;
635 struct nlmsghdr *nlh;
636 struct ndmsg *ndm;
637
638 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
639 if (nlh == NULL)
640 return -EMSGSIZE;
641
642 ndm = nlmsg_data(nlh);
643 ndm->ndm_family = AF_BRIDGE;
644 ndm->ndm_pad1 = 0;
645 ndm->ndm_pad2 = 0;
646 ndm->ndm_flags = 0;
647 ndm->ndm_type = 0;
648 ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
649 ndm->ndm_state = fdb_to_nud(br, fdb);
650
651 if (fdb->offloaded)
652 ndm->ndm_flags |= NTF_OFFLOADED;
653 if (fdb->added_by_external_learn)
654 ndm->ndm_flags |= NTF_EXT_LEARNED;
655 if (fdb->is_sticky)
656 ndm->ndm_flags |= NTF_STICKY;
657
658 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.addr))
659 goto nla_put_failure;
660 if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
661 goto nla_put_failure;
662 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
663 ci.ndm_confirmed = 0;
664 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
665 ci.ndm_refcnt = 0;
666 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
667 goto nla_put_failure;
668
669 if (fdb->key.vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16),
670 &fdb->key.vlan_id))
671 goto nla_put_failure;
672
673 nlmsg_end(skb, nlh);
674 return 0;
675
676nla_put_failure:
677 nlmsg_cancel(skb, nlh);
678 return -EMSGSIZE;
679}
680
681static inline size_t fdb_nlmsg_size(void)
682{
683 return NLMSG_ALIGN(sizeof(struct ndmsg))
684 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
685 + nla_total_size(sizeof(u32)) /* NDA_MASTER */
686 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
687 + nla_total_size(sizeof(struct nda_cacheinfo));
688}
689
690static void fdb_notify(struct net_bridge *br,
691 const struct net_bridge_fdb_entry *fdb, int type,
692 bool swdev_notify)
693{
694 struct net *net = dev_net(br->dev);
695 struct sk_buff *skb;
696 int err = -ENOBUFS;
697
698 if (swdev_notify)
699 br_switchdev_fdb_notify(fdb, type);
700
701 skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
702 if (skb == NULL)
703 goto errout;
704
705 err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
706 if (err < 0) {
707 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
708 WARN_ON(err == -EMSGSIZE);
709 kfree_skb(skb);
710 goto errout;
711 }
712 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
713 return;
714errout:
715 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
716}
717
718/* Dump information about entries, in response to GETNEIGH */
719int br_fdb_dump(struct sk_buff *skb,
720 struct netlink_callback *cb,
721 struct net_device *dev,
722 struct net_device *filter_dev,
723 int *idx)
724{
725 struct net_bridge *br = netdev_priv(dev);
726 struct net_bridge_fdb_entry *f;
727 int err = 0;
728
729 if (!(dev->priv_flags & IFF_EBRIDGE))
730 return err;
731
732 if (!filter_dev) {
733 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
734 if (err < 0)
735 return err;
736 }
737
738 rcu_read_lock();
739 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
740 if (*idx < cb->args[2])
741 goto skip;
742 if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) {
743 if (filter_dev != dev)
744 goto skip;
745 /* !f->dst is a special case for bridge
746 * It means the MAC belongs to the bridge
747 * Therefore need a little more filtering
748 * we only want to dump the !f->dst case
749 */
750 if (f->dst)
751 goto skip;
752 }
753 if (!filter_dev && f->dst)
754 goto skip;
755
756 err = fdb_fill_info(skb, br, f,
757 NETLINK_CB(cb->skb).portid,
758 cb->nlh->nlmsg_seq,
759 RTM_NEWNEIGH,
760 NLM_F_MULTI);
761 if (err < 0)
762 break;
763skip:
764 *idx += 1;
765 }
766 rcu_read_unlock();
767
768 return err;
769}
770
771int br_fdb_get(struct sk_buff *skb,
772 struct nlattr *tb[],
773 struct net_device *dev,
774 const unsigned char *addr,
775 u16 vid, u32 portid, u32 seq,
776 struct netlink_ext_ack *extack)
777{
778 struct net_bridge *br = netdev_priv(dev);
779 struct net_bridge_fdb_entry *f;
780 int err = 0;
781
782 rcu_read_lock();
783 f = br_fdb_find_rcu(br, addr, vid);
784 if (!f) {
785 NL_SET_ERR_MSG(extack, "Fdb entry not found");
786 err = -ENOENT;
787 goto errout;
788 }
789
790 err = fdb_fill_info(skb, br, f, portid, seq,
791 RTM_NEWNEIGH, 0);
792errout:
793 rcu_read_unlock();
794 return err;
795}
796
797/* Update (create or replace) forwarding database entry */
798static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
799 const u8 *addr, u16 state, u16 flags, u16 vid,
800 u8 ndm_flags)
801{
802 u8 is_sticky = !!(ndm_flags & NTF_STICKY);
803 struct net_bridge_fdb_entry *fdb;
804 bool modified = false;
805
806 /* If the port cannot learn allow only local and static entries */
807 if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
808 !(source->state == BR_STATE_LEARNING ||
809 source->state == BR_STATE_FORWARDING))
810 return -EPERM;
811
812 if (!source && !(state & NUD_PERMANENT)) {
813 pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n",
814 br->dev->name);
815 return -EINVAL;
816 }
817
818 if (is_sticky && (state & NUD_PERMANENT))
819 return -EINVAL;
820
821 fdb = br_fdb_find(br, addr, vid);
822 if (fdb == NULL) {
823 if (!(flags & NLM_F_CREATE))
824 return -ENOENT;
825
826 fdb = fdb_create(br, source, addr, vid, 0, 0);
827 if (!fdb)
828 return -ENOMEM;
829
830 modified = true;
831 } else {
832 if (flags & NLM_F_EXCL)
833 return -EEXIST;
834
835 if (fdb->dst != source) {
836 fdb->dst = source;
837 modified = true;
838 }
839 }
840
841 if (fdb_to_nud(br, fdb) != state) {
842 if (state & NUD_PERMANENT) {
843 fdb->is_local = 1;
844 if (!fdb->is_static) {
845 fdb->is_static = 1;
846 fdb_add_hw_addr(br, addr);
847 }
848 } else if (state & NUD_NOARP) {
849 fdb->is_local = 0;
850 if (!fdb->is_static) {
851 fdb->is_static = 1;
852 fdb_add_hw_addr(br, addr);
853 }
854 } else {
855 fdb->is_local = 0;
856 if (fdb->is_static) {
857 fdb->is_static = 0;
858 fdb_del_hw_addr(br, addr);
859 }
860 }
861
862 modified = true;
863 }
864
865 if (is_sticky != fdb->is_sticky) {
866 fdb->is_sticky = is_sticky;
867 modified = true;
868 }
869
870 fdb->added_by_user = 1;
871
872 fdb->used = jiffies;
873 if (modified) {
874 fdb->updated = jiffies;
875 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
876 }
877
878 return 0;
879}
880
881static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
882 struct net_bridge_port *p, const unsigned char *addr,
883 u16 nlh_flags, u16 vid)
884{
885 int err = 0;
886
887 if (ndm->ndm_flags & NTF_USE) {
888 if (!p) {
889 pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n",
890 br->dev->name);
891 return -EINVAL;
892 }
893 local_bh_disable();
894 rcu_read_lock();
895 br_fdb_update(br, p, addr, vid, true);
896 rcu_read_unlock();
897 local_bh_enable();
898 } else if (ndm->ndm_flags & NTF_EXT_LEARNED) {
899 err = br_fdb_external_learn_add(br, p, addr, vid, true);
900 } else {
901 spin_lock_bh(&br->hash_lock);
902 err = fdb_add_entry(br, p, addr, ndm->ndm_state,
903 nlh_flags, vid, ndm->ndm_flags);
904 spin_unlock_bh(&br->hash_lock);
905 }
906
907 return err;
908}
909
910/* Add new permanent fdb entry with RTM_NEWNEIGH */
911int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
912 struct net_device *dev,
913 const unsigned char *addr, u16 vid, u16 nlh_flags,
914 struct netlink_ext_ack *extack)
915{
916 struct net_bridge_vlan_group *vg;
917 struct net_bridge_port *p = NULL;
918 struct net_bridge_vlan *v;
919 struct net_bridge *br = NULL;
920 int err = 0;
921
922 trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags);
923
924 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
925 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
926 return -EINVAL;
927 }
928
929 if (is_zero_ether_addr(addr)) {
930 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
931 return -EINVAL;
932 }
933
934 if (dev->priv_flags & IFF_EBRIDGE) {
935 br = netdev_priv(dev);
936 vg = br_vlan_group(br);
937 } else {
938 p = br_port_get_rtnl(dev);
939 if (!p) {
940 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
941 dev->name);
942 return -EINVAL;
943 }
944 br = p->br;
945 vg = nbp_vlan_group(p);
946 }
947
948 if (vid) {
949 v = br_vlan_find(vg, vid);
950 if (!v || !br_vlan_should_use(v)) {
951 pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
952 return -EINVAL;
953 }
954
955 /* VID was specified, so use it. */
956 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid);
957 } else {
958 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0);
959 if (err || !vg || !vg->num_vlans)
960 goto out;
961
962 /* We have vlans configured on this port and user didn't
963 * specify a VLAN. To be nice, add/update entry for every
964 * vlan on this port.
965 */
966 list_for_each_entry(v, &vg->vlan_list, vlist) {
967 if (!br_vlan_should_use(v))
968 continue;
969 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid);
970 if (err)
971 goto out;
972 }
973 }
974
975out:
976 return err;
977}
978
979static int fdb_delete_by_addr_and_port(struct net_bridge *br,
980 const struct net_bridge_port *p,
981 const u8 *addr, u16 vlan)
982{
983 struct net_bridge_fdb_entry *fdb;
984
985 fdb = br_fdb_find(br, addr, vlan);
986 if (!fdb || fdb->dst != p)
987 return -ENOENT;
988
989 fdb_delete(br, fdb, true);
990
991 return 0;
992}
993
994static int __br_fdb_delete(struct net_bridge *br,
995 const struct net_bridge_port *p,
996 const unsigned char *addr, u16 vid)
997{
998 int err;
999
1000 spin_lock_bh(&br->hash_lock);
1001 err = fdb_delete_by_addr_and_port(br, p, addr, vid);
1002 spin_unlock_bh(&br->hash_lock);
1003
1004 return err;
1005}
1006
1007/* Remove neighbor entry with RTM_DELNEIGH */
1008int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1009 struct net_device *dev,
1010 const unsigned char *addr, u16 vid)
1011{
1012 struct net_bridge_vlan_group *vg;
1013 struct net_bridge_port *p = NULL;
1014 struct net_bridge_vlan *v;
1015 struct net_bridge *br;
1016 int err;
1017
1018 if (dev->priv_flags & IFF_EBRIDGE) {
1019 br = netdev_priv(dev);
1020 vg = br_vlan_group(br);
1021 } else {
1022 p = br_port_get_rtnl(dev);
1023 if (!p) {
1024 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
1025 dev->name);
1026 return -EINVAL;
1027 }
1028 vg = nbp_vlan_group(p);
1029 br = p->br;
1030 }
1031
1032 if (vid) {
1033 v = br_vlan_find(vg, vid);
1034 if (!v) {
1035 pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1036 return -EINVAL;
1037 }
1038
1039 err = __br_fdb_delete(br, p, addr, vid);
1040 } else {
1041 err = -ENOENT;
1042 err &= __br_fdb_delete(br, p, addr, 0);
1043 if (!vg || !vg->num_vlans)
1044 return err;
1045
1046 list_for_each_entry(v, &vg->vlan_list, vlist) {
1047 if (!br_vlan_should_use(v))
1048 continue;
1049 err &= __br_fdb_delete(br, p, addr, v->vid);
1050 }
1051 }
1052
1053 return err;
1054}
1055
1056int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
1057{
1058 struct net_bridge_fdb_entry *f, *tmp;
1059 int err = 0;
1060
1061 ASSERT_RTNL();
1062
1063 /* the key here is that static entries change only under rtnl */
1064 rcu_read_lock();
1065 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1066 /* We only care for static entries */
1067 if (!f->is_static)
1068 continue;
1069 err = dev_uc_add(p->dev, f->key.addr.addr);
1070 if (err)
1071 goto rollback;
1072 }
1073done:
1074 rcu_read_unlock();
1075
1076 return err;
1077
1078rollback:
1079 hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) {
1080 /* We only care for static entries */
1081 if (!tmp->is_static)
1082 continue;
1083 if (tmp == f)
1084 break;
1085 dev_uc_del(p->dev, tmp->key.addr.addr);
1086 }
1087
1088 goto done;
1089}
1090
1091void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
1092{
1093 struct net_bridge_fdb_entry *f;
1094
1095 ASSERT_RTNL();
1096
1097 rcu_read_lock();
1098 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1099 /* We only care for static entries */
1100 if (!f->is_static)
1101 continue;
1102
1103 dev_uc_del(p->dev, f->key.addr.addr);
1104 }
1105 rcu_read_unlock();
1106}
1107
1108int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
1109 const unsigned char *addr, u16 vid,
1110 bool swdev_notify)
1111{
1112 struct net_bridge_fdb_entry *fdb;
1113 bool modified = false;
1114 int err = 0;
1115
1116 trace_br_fdb_external_learn_add(br, p, addr, vid);
1117
1118 spin_lock_bh(&br->hash_lock);
1119
1120 fdb = br_fdb_find(br, addr, vid);
1121 if (!fdb) {
1122 fdb = fdb_create(br, p, addr, vid, 0, 0);
1123 if (!fdb) {
1124 err = -ENOMEM;
1125 goto err_unlock;
1126 }
1127 if (swdev_notify)
1128 fdb->added_by_user = 1;
1129 fdb->added_by_external_learn = 1;
1130 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1131 } else {
1132 fdb->updated = jiffies;
1133
1134 if (fdb->dst != p) {
1135 fdb->dst = p;
1136 modified = true;
1137 }
1138
1139 if (fdb->added_by_external_learn) {
1140 /* Refresh entry */
1141 fdb->used = jiffies;
1142 } else if (!fdb->added_by_user) {
1143 /* Take over SW learned entry */
1144 fdb->added_by_external_learn = 1;
1145 modified = true;
1146 }
1147
1148 if (swdev_notify)
1149 fdb->added_by_user = 1;
1150
1151 if (modified)
1152 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1153 }
1154
1155err_unlock:
1156 spin_unlock_bh(&br->hash_lock);
1157
1158 return err;
1159}
1160
1161int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
1162 const unsigned char *addr, u16 vid,
1163 bool swdev_notify)
1164{
1165 struct net_bridge_fdb_entry *fdb;
1166 int err = 0;
1167
1168 spin_lock_bh(&br->hash_lock);
1169
1170 fdb = br_fdb_find(br, addr, vid);
1171 if (fdb && fdb->added_by_external_learn)
1172 fdb_delete(br, fdb, swdev_notify);
1173 else
1174 err = -ENOENT;
1175
1176 spin_unlock_bh(&br->hash_lock);
1177
1178 return err;
1179}
1180
1181void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
1182 const unsigned char *addr, u16 vid, bool offloaded)
1183{
1184 struct net_bridge_fdb_entry *fdb;
1185
1186 spin_lock_bh(&br->hash_lock);
1187
1188 fdb = br_fdb_find(br, addr, vid);
1189 if (fdb)
1190 fdb->offloaded = offloaded;
1191
1192 spin_unlock_bh(&br->hash_lock);
1193}
1194
1195void br_fdb_clear_offload(const struct net_device *dev, u16 vid)
1196{
1197 struct net_bridge_fdb_entry *f;
1198 struct net_bridge_port *p;
1199
1200 ASSERT_RTNL();
1201
1202 p = br_port_get_rtnl(dev);
1203 if (!p)
1204 return;
1205
1206 spin_lock_bh(&p->br->hash_lock);
1207 hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) {
1208 if (f->dst == p && f->key.vlan_id == vid)
1209 f->offloaded = 0;
1210 }
1211 spin_unlock_bh(&p->br->hash_lock);
1212}
1213EXPORT_SYMBOL_GPL(br_fdb_clear_offload);
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 <asm/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
27static 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
34static struct kmem_cache *br_fdb_cache __read_mostly;
35
36int __init br_fdb_init(void)
37{
38 br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
39 sizeof(struct net_bridge_fdb_entry),
40 0,
41 SLAB_HWCACHE_ALIGN, NULL);
42 if (!br_fdb_cache)
43 return -ENOMEM;
44
45 return 0;
46}
47
48void br_fdb_fini(void)
49{
50 kmem_cache_destroy(br_fdb_cache);
51}
52
53int br_fdb_hash_init(struct net_bridge *br)
54{
55 return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params);
56}
57
58void br_fdb_hash_fini(struct net_bridge *br)
59{
60 rhashtable_destroy(&br->fdb_hash_tbl);
61}
62
63/* if topology_changing then use forward_delay (default 15 sec)
64 * otherwise keep longer (default 5 minutes)
65 */
66static inline unsigned long hold_time(const struct net_bridge *br)
67{
68 return br->topology_change ? br->forward_delay : br->ageing_time;
69}
70
71static inline int has_expired(const struct net_bridge *br,
72 const struct net_bridge_fdb_entry *fdb)
73{
74 return !test_bit(BR_FDB_STATIC, &fdb->flags) &&
75 !test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags) &&
76 time_before_eq(fdb->updated + hold_time(br), jiffies);
77}
78
79static void fdb_rcu_free(struct rcu_head *head)
80{
81 struct net_bridge_fdb_entry *ent
82 = container_of(head, struct net_bridge_fdb_entry, rcu);
83 kmem_cache_free(br_fdb_cache, ent);
84}
85
86static int fdb_to_nud(const struct net_bridge *br,
87 const struct net_bridge_fdb_entry *fdb)
88{
89 if (test_bit(BR_FDB_LOCAL, &fdb->flags))
90 return NUD_PERMANENT;
91 else if (test_bit(BR_FDB_STATIC, &fdb->flags))
92 return NUD_NOARP;
93 else if (has_expired(br, fdb))
94 return NUD_STALE;
95 else
96 return NUD_REACHABLE;
97}
98
99static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
100 const struct net_bridge_fdb_entry *fdb,
101 u32 portid, u32 seq, int type, unsigned int flags)
102{
103 const struct net_bridge_port *dst = READ_ONCE(fdb->dst);
104 unsigned long now = jiffies;
105 struct nda_cacheinfo ci;
106 struct nlmsghdr *nlh;
107 struct ndmsg *ndm;
108 u32 ext_flags = 0;
109
110 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
111 if (nlh == NULL)
112 return -EMSGSIZE;
113
114 ndm = nlmsg_data(nlh);
115 ndm->ndm_family = AF_BRIDGE;
116 ndm->ndm_pad1 = 0;
117 ndm->ndm_pad2 = 0;
118 ndm->ndm_flags = 0;
119 ndm->ndm_type = 0;
120 ndm->ndm_ifindex = dst ? dst->dev->ifindex : br->dev->ifindex;
121 ndm->ndm_state = fdb_to_nud(br, fdb);
122
123 if (test_bit(BR_FDB_OFFLOADED, &fdb->flags))
124 ndm->ndm_flags |= NTF_OFFLOADED;
125 if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
126 ndm->ndm_flags |= NTF_EXT_LEARNED;
127 if (test_bit(BR_FDB_STICKY, &fdb->flags))
128 ndm->ndm_flags |= NTF_STICKY;
129 if (test_bit(BR_FDB_LOCKED, &fdb->flags))
130 ext_flags |= NTF_EXT_LOCKED;
131
132 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.addr))
133 goto nla_put_failure;
134 if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
135 goto nla_put_failure;
136 if (nla_put_u32(skb, NDA_FLAGS_EXT, ext_flags))
137 goto nla_put_failure;
138
139 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
140 ci.ndm_confirmed = 0;
141 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
142 ci.ndm_refcnt = 0;
143 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
144 goto nla_put_failure;
145
146 if (fdb->key.vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16),
147 &fdb->key.vlan_id))
148 goto nla_put_failure;
149
150 if (test_bit(BR_FDB_NOTIFY, &fdb->flags)) {
151 struct nlattr *nest = nla_nest_start(skb, NDA_FDB_EXT_ATTRS);
152 u8 notify_bits = FDB_NOTIFY_BIT;
153
154 if (!nest)
155 goto nla_put_failure;
156 if (test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags))
157 notify_bits |= FDB_NOTIFY_INACTIVE_BIT;
158
159 if (nla_put_u8(skb, NFEA_ACTIVITY_NOTIFY, notify_bits)) {
160 nla_nest_cancel(skb, nest);
161 goto nla_put_failure;
162 }
163
164 nla_nest_end(skb, nest);
165 }
166
167 nlmsg_end(skb, nlh);
168 return 0;
169
170nla_put_failure:
171 nlmsg_cancel(skb, nlh);
172 return -EMSGSIZE;
173}
174
175static inline size_t fdb_nlmsg_size(void)
176{
177 return NLMSG_ALIGN(sizeof(struct ndmsg))
178 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
179 + nla_total_size(sizeof(u32)) /* NDA_MASTER */
180 + nla_total_size(sizeof(u32)) /* NDA_FLAGS_EXT */
181 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
182 + nla_total_size(sizeof(struct nda_cacheinfo))
183 + nla_total_size(0) /* NDA_FDB_EXT_ATTRS */
184 + nla_total_size(sizeof(u8)); /* NFEA_ACTIVITY_NOTIFY */
185}
186
187static void fdb_notify(struct net_bridge *br,
188 const struct net_bridge_fdb_entry *fdb, int type,
189 bool swdev_notify)
190{
191 struct net *net = dev_net(br->dev);
192 struct sk_buff *skb;
193 int err = -ENOBUFS;
194
195 if (swdev_notify)
196 br_switchdev_fdb_notify(br, fdb, type);
197
198 skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
199 if (skb == NULL)
200 goto errout;
201
202 err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
203 if (err < 0) {
204 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
205 WARN_ON(err == -EMSGSIZE);
206 kfree_skb(skb);
207 goto errout;
208 }
209 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
210 return;
211errout:
212 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
213}
214
215static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl,
216 const unsigned char *addr,
217 __u16 vid)
218{
219 struct net_bridge_fdb_key key;
220
221 WARN_ON_ONCE(!rcu_read_lock_held());
222
223 key.vlan_id = vid;
224 memcpy(key.addr.addr, addr, sizeof(key.addr.addr));
225
226 return rhashtable_lookup(tbl, &key, br_fdb_rht_params);
227}
228
229/* requires bridge hash_lock */
230static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br,
231 const unsigned char *addr,
232 __u16 vid)
233{
234 struct net_bridge_fdb_entry *fdb;
235
236 lockdep_assert_held_once(&br->hash_lock);
237
238 rcu_read_lock();
239 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
240 rcu_read_unlock();
241
242 return fdb;
243}
244
245struct net_device *br_fdb_find_port(const struct net_device *br_dev,
246 const unsigned char *addr,
247 __u16 vid)
248{
249 struct net_bridge_fdb_entry *f;
250 struct net_device *dev = NULL;
251 struct net_bridge *br;
252
253 ASSERT_RTNL();
254
255 if (!netif_is_bridge_master(br_dev))
256 return NULL;
257
258 br = netdev_priv(br_dev);
259 rcu_read_lock();
260 f = br_fdb_find_rcu(br, addr, vid);
261 if (f && f->dst)
262 dev = f->dst->dev;
263 rcu_read_unlock();
264
265 return dev;
266}
267EXPORT_SYMBOL_GPL(br_fdb_find_port);
268
269struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
270 const unsigned char *addr,
271 __u16 vid)
272{
273 return fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
274}
275
276/* When a static FDB entry is added, the mac address from the entry is
277 * added to the bridge private HW address list and all required ports
278 * are then updated with the new information.
279 * Called under RTNL.
280 */
281static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr)
282{
283 int err;
284 struct net_bridge_port *p;
285
286 ASSERT_RTNL();
287
288 list_for_each_entry(p, &br->port_list, list) {
289 if (!br_promisc_port(p)) {
290 err = dev_uc_add(p->dev, addr);
291 if (err)
292 goto undo;
293 }
294 }
295
296 return;
297undo:
298 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
299 if (!br_promisc_port(p))
300 dev_uc_del(p->dev, addr);
301 }
302}
303
304/* When a static FDB entry is deleted, the HW address from that entry is
305 * also removed from the bridge private HW address list and updates all
306 * the ports with needed information.
307 * Called under RTNL.
308 */
309static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
310{
311 struct net_bridge_port *p;
312
313 ASSERT_RTNL();
314
315 list_for_each_entry(p, &br->port_list, list) {
316 if (!br_promisc_port(p))
317 dev_uc_del(p->dev, addr);
318 }
319}
320
321static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f,
322 bool swdev_notify)
323{
324 trace_fdb_delete(br, f);
325
326 if (test_bit(BR_FDB_STATIC, &f->flags))
327 fdb_del_hw_addr(br, f->key.addr.addr);
328
329 hlist_del_init_rcu(&f->fdb_node);
330 rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode,
331 br_fdb_rht_params);
332 if (test_and_clear_bit(BR_FDB_DYNAMIC_LEARNED, &f->flags))
333 atomic_dec(&br->fdb_n_learned);
334 fdb_notify(br, f, RTM_DELNEIGH, swdev_notify);
335 call_rcu(&f->rcu, fdb_rcu_free);
336}
337
338/* Delete a local entry if no other port had the same address.
339 *
340 * This function should only be called on entries with BR_FDB_LOCAL set,
341 * so even with BR_FDB_ADDED_BY_USER cleared we never need to increase
342 * the accounting for dynamically learned entries again.
343 */
344static void fdb_delete_local(struct net_bridge *br,
345 const struct net_bridge_port *p,
346 struct net_bridge_fdb_entry *f)
347{
348 const unsigned char *addr = f->key.addr.addr;
349 struct net_bridge_vlan_group *vg;
350 const struct net_bridge_vlan *v;
351 struct net_bridge_port *op;
352 u16 vid = f->key.vlan_id;
353
354 /* Maybe another port has same hw addr? */
355 list_for_each_entry(op, &br->port_list, list) {
356 vg = nbp_vlan_group(op);
357 if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
358 (!vid || br_vlan_find(vg, vid))) {
359 f->dst = op;
360 clear_bit(BR_FDB_ADDED_BY_USER, &f->flags);
361 return;
362 }
363 }
364
365 vg = br_vlan_group(br);
366 v = br_vlan_find(vg, vid);
367 /* Maybe bridge device has same hw addr? */
368 if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
369 (!vid || (v && br_vlan_should_use(v)))) {
370 f->dst = NULL;
371 clear_bit(BR_FDB_ADDED_BY_USER, &f->flags);
372 return;
373 }
374
375 fdb_delete(br, f, true);
376}
377
378void br_fdb_find_delete_local(struct net_bridge *br,
379 const struct net_bridge_port *p,
380 const unsigned char *addr, u16 vid)
381{
382 struct net_bridge_fdb_entry *f;
383
384 spin_lock_bh(&br->hash_lock);
385 f = br_fdb_find(br, addr, vid);
386 if (f && test_bit(BR_FDB_LOCAL, &f->flags) &&
387 !test_bit(BR_FDB_ADDED_BY_USER, &f->flags) && f->dst == p)
388 fdb_delete_local(br, p, f);
389 spin_unlock_bh(&br->hash_lock);
390}
391
392static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
393 struct net_bridge_port *source,
394 const unsigned char *addr,
395 __u16 vid,
396 unsigned long flags)
397{
398 bool learned = !test_bit(BR_FDB_ADDED_BY_USER, &flags) &&
399 !test_bit(BR_FDB_LOCAL, &flags);
400 u32 max_learned = READ_ONCE(br->fdb_max_learned);
401 struct net_bridge_fdb_entry *fdb;
402 int err;
403
404 if (likely(learned)) {
405 int n_learned = atomic_read(&br->fdb_n_learned);
406
407 if (unlikely(max_learned && n_learned >= max_learned))
408 return NULL;
409 __set_bit(BR_FDB_DYNAMIC_LEARNED, &flags);
410 }
411
412 fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
413 if (!fdb)
414 return NULL;
415
416 memcpy(fdb->key.addr.addr, addr, ETH_ALEN);
417 WRITE_ONCE(fdb->dst, source);
418 fdb->key.vlan_id = vid;
419 fdb->flags = flags;
420 fdb->updated = fdb->used = jiffies;
421 err = rhashtable_lookup_insert_fast(&br->fdb_hash_tbl, &fdb->rhnode,
422 br_fdb_rht_params);
423 if (err) {
424 kmem_cache_free(br_fdb_cache, fdb);
425 return NULL;
426 }
427
428 if (likely(learned))
429 atomic_inc(&br->fdb_n_learned);
430
431 hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list);
432
433 return fdb;
434}
435
436static int fdb_add_local(struct net_bridge *br, struct net_bridge_port *source,
437 const unsigned char *addr, u16 vid)
438{
439 struct net_bridge_fdb_entry *fdb;
440
441 if (!is_valid_ether_addr(addr))
442 return -EINVAL;
443
444 fdb = br_fdb_find(br, addr, vid);
445 if (fdb) {
446 /* it is okay to have multiple ports with same
447 * address, just use the first one.
448 */
449 if (test_bit(BR_FDB_LOCAL, &fdb->flags))
450 return 0;
451 br_warn(br, "adding interface %s with same address as a received packet (addr:%pM, vlan:%u)\n",
452 source ? source->dev->name : br->dev->name, addr, vid);
453 fdb_delete(br, fdb, true);
454 }
455
456 fdb = fdb_create(br, source, addr, vid,
457 BIT(BR_FDB_LOCAL) | BIT(BR_FDB_STATIC));
458 if (!fdb)
459 return -ENOMEM;
460
461 fdb_add_hw_addr(br, addr);
462 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
463 return 0;
464}
465
466void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
467{
468 struct net_bridge_vlan_group *vg;
469 struct net_bridge_fdb_entry *f;
470 struct net_bridge *br = p->br;
471 struct net_bridge_vlan *v;
472
473 spin_lock_bh(&br->hash_lock);
474 vg = nbp_vlan_group(p);
475 hlist_for_each_entry(f, &br->fdb_list, fdb_node) {
476 if (f->dst == p && test_bit(BR_FDB_LOCAL, &f->flags) &&
477 !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) {
478 /* delete old one */
479 fdb_delete_local(br, p, f);
480
481 /* if this port has no vlan information
482 * configured, we can safely be done at
483 * this point.
484 */
485 if (!vg || !vg->num_vlans)
486 goto insert;
487 }
488 }
489
490insert:
491 /* insert new address, may fail if invalid address or dup. */
492 fdb_add_local(br, p, newaddr, 0);
493
494 if (!vg || !vg->num_vlans)
495 goto done;
496
497 /* Now add entries for every VLAN configured on the port.
498 * This function runs under RTNL so the bitmap will not change
499 * from under us.
500 */
501 list_for_each_entry(v, &vg->vlan_list, vlist)
502 fdb_add_local(br, p, newaddr, v->vid);
503
504done:
505 spin_unlock_bh(&br->hash_lock);
506}
507
508void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
509{
510 struct net_bridge_vlan_group *vg;
511 struct net_bridge_fdb_entry *f;
512 struct net_bridge_vlan *v;
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)
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 }
539out:
540 spin_unlock_bh(&br->hash_lock);
541}
542
543void 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 = 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
589static bool __fdb_flush_matches(const struct net_bridge *br,
590 const struct net_bridge_fdb_entry *f,
591 const struct net_bridge_fdb_flush_desc *desc)
592{
593 const struct net_bridge_port *dst = READ_ONCE(f->dst);
594 int port_ifidx = dst ? dst->dev->ifindex : br->dev->ifindex;
595
596 if (desc->vlan_id && desc->vlan_id != f->key.vlan_id)
597 return false;
598 if (desc->port_ifindex && desc->port_ifindex != port_ifidx)
599 return false;
600 if (desc->flags_mask && (f->flags & desc->flags_mask) != desc->flags)
601 return false;
602
603 return true;
604}
605
606/* Flush forwarding database entries matching the description */
607void br_fdb_flush(struct net_bridge *br,
608 const struct net_bridge_fdb_flush_desc *desc)
609{
610 struct net_bridge_fdb_entry *f;
611
612 rcu_read_lock();
613 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
614 if (!__fdb_flush_matches(br, f, desc))
615 continue;
616
617 spin_lock_bh(&br->hash_lock);
618 if (!hlist_unhashed(&f->fdb_node))
619 fdb_delete(br, f, true);
620 spin_unlock_bh(&br->hash_lock);
621 }
622 rcu_read_unlock();
623}
624
625static unsigned long __ndm_state_to_fdb_flags(u16 ndm_state)
626{
627 unsigned long flags = 0;
628
629 if (ndm_state & NUD_PERMANENT)
630 __set_bit(BR_FDB_LOCAL, &flags);
631 if (ndm_state & NUD_NOARP)
632 __set_bit(BR_FDB_STATIC, &flags);
633
634 return flags;
635}
636
637static unsigned long __ndm_flags_to_fdb_flags(u8 ndm_flags)
638{
639 unsigned long flags = 0;
640
641 if (ndm_flags & NTF_USE)
642 __set_bit(BR_FDB_ADDED_BY_USER, &flags);
643 if (ndm_flags & NTF_EXT_LEARNED)
644 __set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &flags);
645 if (ndm_flags & NTF_OFFLOADED)
646 __set_bit(BR_FDB_OFFLOADED, &flags);
647 if (ndm_flags & NTF_STICKY)
648 __set_bit(BR_FDB_STICKY, &flags);
649
650 return flags;
651}
652
653static int __fdb_flush_validate_ifindex(const struct net_bridge *br,
654 int ifindex,
655 struct netlink_ext_ack *extack)
656{
657 const struct net_device *dev;
658
659 dev = __dev_get_by_index(dev_net(br->dev), ifindex);
660 if (!dev) {
661 NL_SET_ERR_MSG_MOD(extack, "Unknown flush device ifindex");
662 return -ENODEV;
663 }
664 if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev)) {
665 NL_SET_ERR_MSG_MOD(extack, "Flush device is not a bridge or bridge port");
666 return -EINVAL;
667 }
668 if (netif_is_bridge_master(dev) && dev != br->dev) {
669 NL_SET_ERR_MSG_MOD(extack,
670 "Flush bridge device does not match target bridge device");
671 return -EINVAL;
672 }
673 if (netif_is_bridge_port(dev)) {
674 struct net_bridge_port *p = br_port_get_rtnl(dev);
675
676 if (p->br != br) {
677 NL_SET_ERR_MSG_MOD(extack, "Port belongs to a different bridge device");
678 return -EINVAL;
679 }
680 }
681
682 return 0;
683}
684
685static const struct nla_policy br_fdb_del_bulk_policy[NDA_MAX + 1] = {
686 [NDA_VLAN] = NLA_POLICY_RANGE(NLA_U16, 1, VLAN_N_VID - 2),
687 [NDA_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 1),
688 [NDA_NDM_STATE_MASK] = { .type = NLA_U16 },
689 [NDA_NDM_FLAGS_MASK] = { .type = NLA_U8 },
690};
691
692int br_fdb_delete_bulk(struct nlmsghdr *nlh, struct net_device *dev,
693 struct netlink_ext_ack *extack)
694{
695 struct net_bridge_fdb_flush_desc desc = {};
696 struct ndmsg *ndm = nlmsg_data(nlh);
697 struct net_bridge_port *p = NULL;
698 struct nlattr *tb[NDA_MAX + 1];
699 struct net_bridge *br;
700 u8 ndm_flags;
701 int err;
702
703 ndm_flags = ndm->ndm_flags & ~FDB_FLUSH_IGNORED_NDM_FLAGS;
704
705 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX,
706 br_fdb_del_bulk_policy, extack);
707 if (err)
708 return err;
709
710 if (netif_is_bridge_master(dev)) {
711 br = netdev_priv(dev);
712 } else {
713 p = br_port_get_rtnl(dev);
714 if (!p) {
715 NL_SET_ERR_MSG_MOD(extack, "Device is not a bridge port");
716 return -EINVAL;
717 }
718 br = p->br;
719 }
720
721 if (tb[NDA_VLAN])
722 desc.vlan_id = nla_get_u16(tb[NDA_VLAN]);
723
724 if (ndm_flags & ~FDB_FLUSH_ALLOWED_NDM_FLAGS) {
725 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm flag bits set");
726 return -EINVAL;
727 }
728 if (ndm->ndm_state & ~FDB_FLUSH_ALLOWED_NDM_STATES) {
729 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm state bits set");
730 return -EINVAL;
731 }
732
733 desc.flags |= __ndm_state_to_fdb_flags(ndm->ndm_state);
734 desc.flags |= __ndm_flags_to_fdb_flags(ndm_flags);
735 if (tb[NDA_NDM_STATE_MASK]) {
736 u16 ndm_state_mask = nla_get_u16(tb[NDA_NDM_STATE_MASK]);
737
738 desc.flags_mask |= __ndm_state_to_fdb_flags(ndm_state_mask);
739 }
740 if (tb[NDA_NDM_FLAGS_MASK]) {
741 u8 ndm_flags_mask = nla_get_u8(tb[NDA_NDM_FLAGS_MASK]);
742
743 desc.flags_mask |= __ndm_flags_to_fdb_flags(ndm_flags_mask);
744 }
745 if (tb[NDA_IFINDEX]) {
746 int ifidx = nla_get_s32(tb[NDA_IFINDEX]);
747
748 err = __fdb_flush_validate_ifindex(br, ifidx, extack);
749 if (err)
750 return err;
751 desc.port_ifindex = ifidx;
752 } else if (p) {
753 /* flush was invoked with port device and NTF_MASTER */
754 desc.port_ifindex = p->dev->ifindex;
755 }
756
757 br_debug(br, "flushing port ifindex: %d vlan id: %u flags: 0x%lx flags mask: 0x%lx\n",
758 desc.port_ifindex, desc.vlan_id, desc.flags, desc.flags_mask);
759
760 br_fdb_flush(br, &desc);
761
762 return 0;
763}
764
765/* Flush all entries referring to a specific port.
766 * if do_all is set also flush static entries
767 * if vid is set delete all entries that match the vlan_id
768 */
769void br_fdb_delete_by_port(struct net_bridge *br,
770 const struct net_bridge_port *p,
771 u16 vid,
772 int do_all)
773{
774 struct net_bridge_fdb_entry *f;
775 struct hlist_node *tmp;
776
777 spin_lock_bh(&br->hash_lock);
778 hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
779 if (f->dst != p)
780 continue;
781
782 if (!do_all)
783 if (test_bit(BR_FDB_STATIC, &f->flags) ||
784 (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags) &&
785 !test_bit(BR_FDB_OFFLOADED, &f->flags)) ||
786 (vid && f->key.vlan_id != vid))
787 continue;
788
789 if (test_bit(BR_FDB_LOCAL, &f->flags))
790 fdb_delete_local(br, p, f);
791 else
792 fdb_delete(br, f, true);
793 }
794 spin_unlock_bh(&br->hash_lock);
795}
796
797#if IS_ENABLED(CONFIG_ATM_LANE)
798/* Interface used by ATM LANE hook to test
799 * if an addr is on some other bridge port */
800int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
801{
802 struct net_bridge_fdb_entry *fdb;
803 struct net_bridge_port *port;
804 int ret;
805
806 rcu_read_lock();
807 port = br_port_get_rcu(dev);
808 if (!port)
809 ret = 0;
810 else {
811 const struct net_bridge_port *dst = NULL;
812
813 fdb = br_fdb_find_rcu(port->br, addr, 0);
814 if (fdb)
815 dst = READ_ONCE(fdb->dst);
816
817 ret = dst && dst->dev != dev &&
818 dst->state == BR_STATE_FORWARDING;
819 }
820 rcu_read_unlock();
821
822 return ret;
823}
824#endif /* CONFIG_ATM_LANE */
825
826/*
827 * Fill buffer with forwarding table records in
828 * the API format.
829 */
830int br_fdb_fillbuf(struct net_bridge *br, void *buf,
831 unsigned long maxnum, unsigned long skip)
832{
833 struct net_bridge_fdb_entry *f;
834 struct __fdb_entry *fe = buf;
835 int num = 0;
836
837 memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
838
839 rcu_read_lock();
840 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
841 if (num >= maxnum)
842 break;
843
844 if (has_expired(br, f))
845 continue;
846
847 /* ignore pseudo entry for local MAC address */
848 if (!f->dst)
849 continue;
850
851 if (skip) {
852 --skip;
853 continue;
854 }
855
856 /* convert from internal format to API */
857 memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN);
858
859 /* due to ABI compat need to split into hi/lo */
860 fe->port_no = f->dst->port_no;
861 fe->port_hi = f->dst->port_no >> 8;
862
863 fe->is_local = test_bit(BR_FDB_LOCAL, &f->flags);
864 if (!test_bit(BR_FDB_STATIC, &f->flags))
865 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
866 ++fe;
867 ++num;
868 }
869 rcu_read_unlock();
870
871 return num;
872}
873
874/* Add entry for local address of interface */
875int br_fdb_add_local(struct net_bridge *br, struct net_bridge_port *source,
876 const unsigned char *addr, u16 vid)
877{
878 int ret;
879
880 spin_lock_bh(&br->hash_lock);
881 ret = fdb_add_local(br, source, addr, vid);
882 spin_unlock_bh(&br->hash_lock);
883 return ret;
884}
885
886/* returns true if the fdb was modified */
887static bool __fdb_mark_active(struct net_bridge_fdb_entry *fdb)
888{
889 return !!(test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags) &&
890 test_and_clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags));
891}
892
893void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
894 const unsigned char *addr, u16 vid, unsigned long flags)
895{
896 struct net_bridge_fdb_entry *fdb;
897
898 /* some users want to always flood. */
899 if (hold_time(br) == 0)
900 return;
901
902 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
903 if (likely(fdb)) {
904 /* attempt to update an entry for a local interface */
905 if (unlikely(test_bit(BR_FDB_LOCAL, &fdb->flags))) {
906 if (net_ratelimit())
907 br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n",
908 source->dev->name, addr, vid);
909 } else {
910 unsigned long now = jiffies;
911 bool fdb_modified = false;
912
913 if (now != fdb->updated) {
914 fdb->updated = now;
915 fdb_modified = __fdb_mark_active(fdb);
916 }
917
918 /* fastpath: update of existing entry */
919 if (unlikely(source != READ_ONCE(fdb->dst) &&
920 !test_bit(BR_FDB_STICKY, &fdb->flags))) {
921 br_switchdev_fdb_notify(br, fdb, RTM_DELNEIGH);
922 WRITE_ONCE(fdb->dst, source);
923 fdb_modified = true;
924 /* Take over HW learned entry */
925 if (unlikely(test_bit(BR_FDB_ADDED_BY_EXT_LEARN,
926 &fdb->flags)))
927 clear_bit(BR_FDB_ADDED_BY_EXT_LEARN,
928 &fdb->flags);
929 /* Clear locked flag when roaming to an
930 * unlocked port.
931 */
932 if (unlikely(test_bit(BR_FDB_LOCKED, &fdb->flags)))
933 clear_bit(BR_FDB_LOCKED, &fdb->flags);
934 }
935
936 if (unlikely(test_bit(BR_FDB_ADDED_BY_USER, &flags))) {
937 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
938 if (test_and_clear_bit(BR_FDB_DYNAMIC_LEARNED,
939 &fdb->flags))
940 atomic_dec(&br->fdb_n_learned);
941 }
942 if (unlikely(fdb_modified)) {
943 trace_br_fdb_update(br, source, addr, vid, flags);
944 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
945 }
946 }
947 } else {
948 spin_lock(&br->hash_lock);
949 fdb = fdb_create(br, source, addr, vid, flags);
950 if (fdb) {
951 trace_br_fdb_update(br, source, addr, vid, flags);
952 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
953 }
954 /* else we lose race and someone else inserts
955 * it first, don't bother updating
956 */
957 spin_unlock(&br->hash_lock);
958 }
959}
960
961/* Dump information about entries, in response to GETNEIGH */
962int br_fdb_dump(struct sk_buff *skb,
963 struct netlink_callback *cb,
964 struct net_device *dev,
965 struct net_device *filter_dev,
966 int *idx)
967{
968 struct net_bridge *br = netdev_priv(dev);
969 struct net_bridge_fdb_entry *f;
970 int err = 0;
971
972 if (!netif_is_bridge_master(dev))
973 return err;
974
975 if (!filter_dev) {
976 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
977 if (err < 0)
978 return err;
979 }
980
981 rcu_read_lock();
982 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
983 if (*idx < cb->args[2])
984 goto skip;
985 if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) {
986 if (filter_dev != dev)
987 goto skip;
988 /* !f->dst is a special case for bridge
989 * It means the MAC belongs to the bridge
990 * Therefore need a little more filtering
991 * we only want to dump the !f->dst case
992 */
993 if (f->dst)
994 goto skip;
995 }
996 if (!filter_dev && f->dst)
997 goto skip;
998
999 err = fdb_fill_info(skb, br, f,
1000 NETLINK_CB(cb->skb).portid,
1001 cb->nlh->nlmsg_seq,
1002 RTM_NEWNEIGH,
1003 NLM_F_MULTI);
1004 if (err < 0)
1005 break;
1006skip:
1007 *idx += 1;
1008 }
1009 rcu_read_unlock();
1010
1011 return err;
1012}
1013
1014int br_fdb_get(struct sk_buff *skb,
1015 struct nlattr *tb[],
1016 struct net_device *dev,
1017 const unsigned char *addr,
1018 u16 vid, u32 portid, u32 seq,
1019 struct netlink_ext_ack *extack)
1020{
1021 struct net_bridge *br = netdev_priv(dev);
1022 struct net_bridge_fdb_entry *f;
1023 int err = 0;
1024
1025 rcu_read_lock();
1026 f = br_fdb_find_rcu(br, addr, vid);
1027 if (!f) {
1028 NL_SET_ERR_MSG(extack, "Fdb entry not found");
1029 err = -ENOENT;
1030 goto errout;
1031 }
1032
1033 err = fdb_fill_info(skb, br, f, portid, seq,
1034 RTM_NEWNEIGH, 0);
1035errout:
1036 rcu_read_unlock();
1037 return err;
1038}
1039
1040/* returns true if the fdb is modified */
1041static bool fdb_handle_notify(struct net_bridge_fdb_entry *fdb, u8 notify)
1042{
1043 bool modified = false;
1044
1045 /* allow to mark an entry as inactive, usually done on creation */
1046 if ((notify & FDB_NOTIFY_INACTIVE_BIT) &&
1047 !test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags))
1048 modified = true;
1049
1050 if ((notify & FDB_NOTIFY_BIT) &&
1051 !test_and_set_bit(BR_FDB_NOTIFY, &fdb->flags)) {
1052 /* enabled activity tracking */
1053 modified = true;
1054 } else if (!(notify & FDB_NOTIFY_BIT) &&
1055 test_and_clear_bit(BR_FDB_NOTIFY, &fdb->flags)) {
1056 /* disabled activity tracking, clear notify state */
1057 clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags);
1058 modified = true;
1059 }
1060
1061 return modified;
1062}
1063
1064/* Update (create or replace) forwarding database entry */
1065static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
1066 const u8 *addr, struct ndmsg *ndm, u16 flags, u16 vid,
1067 struct nlattr *nfea_tb[])
1068{
1069 bool is_sticky = !!(ndm->ndm_flags & NTF_STICKY);
1070 bool refresh = !nfea_tb[NFEA_DONT_REFRESH];
1071 struct net_bridge_fdb_entry *fdb;
1072 u16 state = ndm->ndm_state;
1073 bool modified = false;
1074 u8 notify = 0;
1075
1076 /* If the port cannot learn allow only local and static entries */
1077 if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
1078 !(source->state == BR_STATE_LEARNING ||
1079 source->state == BR_STATE_FORWARDING))
1080 return -EPERM;
1081
1082 if (!source && !(state & NUD_PERMANENT)) {
1083 pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n",
1084 br->dev->name);
1085 return -EINVAL;
1086 }
1087
1088 if (is_sticky && (state & NUD_PERMANENT))
1089 return -EINVAL;
1090
1091 if (nfea_tb[NFEA_ACTIVITY_NOTIFY]) {
1092 notify = nla_get_u8(nfea_tb[NFEA_ACTIVITY_NOTIFY]);
1093 if ((notify & ~BR_FDB_NOTIFY_SETTABLE_BITS) ||
1094 (notify & BR_FDB_NOTIFY_SETTABLE_BITS) == FDB_NOTIFY_INACTIVE_BIT)
1095 return -EINVAL;
1096 }
1097
1098 fdb = br_fdb_find(br, addr, vid);
1099 if (fdb == NULL) {
1100 if (!(flags & NLM_F_CREATE))
1101 return -ENOENT;
1102
1103 fdb = fdb_create(br, source, addr, vid,
1104 BIT(BR_FDB_ADDED_BY_USER));
1105 if (!fdb)
1106 return -ENOMEM;
1107
1108 modified = true;
1109 } else {
1110 if (flags & NLM_F_EXCL)
1111 return -EEXIST;
1112
1113 if (READ_ONCE(fdb->dst) != source) {
1114 WRITE_ONCE(fdb->dst, source);
1115 modified = true;
1116 }
1117
1118 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
1119 if (test_and_clear_bit(BR_FDB_DYNAMIC_LEARNED, &fdb->flags))
1120 atomic_dec(&br->fdb_n_learned);
1121 }
1122
1123 if (fdb_to_nud(br, fdb) != state) {
1124 if (state & NUD_PERMANENT) {
1125 set_bit(BR_FDB_LOCAL, &fdb->flags);
1126 if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags))
1127 fdb_add_hw_addr(br, addr);
1128 } else if (state & NUD_NOARP) {
1129 clear_bit(BR_FDB_LOCAL, &fdb->flags);
1130 if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags))
1131 fdb_add_hw_addr(br, addr);
1132 } else {
1133 clear_bit(BR_FDB_LOCAL, &fdb->flags);
1134 if (test_and_clear_bit(BR_FDB_STATIC, &fdb->flags))
1135 fdb_del_hw_addr(br, addr);
1136 }
1137
1138 modified = true;
1139 }
1140
1141 if (is_sticky != test_bit(BR_FDB_STICKY, &fdb->flags)) {
1142 change_bit(BR_FDB_STICKY, &fdb->flags);
1143 modified = true;
1144 }
1145
1146 if (test_and_clear_bit(BR_FDB_LOCKED, &fdb->flags))
1147 modified = true;
1148
1149 if (fdb_handle_notify(fdb, notify))
1150 modified = true;
1151
1152 fdb->used = jiffies;
1153 if (modified) {
1154 if (refresh)
1155 fdb->updated = jiffies;
1156 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
1157 }
1158
1159 return 0;
1160}
1161
1162static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
1163 struct net_bridge_port *p, const unsigned char *addr,
1164 u16 nlh_flags, u16 vid, struct nlattr *nfea_tb[],
1165 struct netlink_ext_ack *extack)
1166{
1167 int err = 0;
1168
1169 if (ndm->ndm_flags & NTF_USE) {
1170 if (!p) {
1171 pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n",
1172 br->dev->name);
1173 return -EINVAL;
1174 }
1175 if (!nbp_state_should_learn(p))
1176 return 0;
1177
1178 local_bh_disable();
1179 rcu_read_lock();
1180 br_fdb_update(br, p, addr, vid, BIT(BR_FDB_ADDED_BY_USER));
1181 rcu_read_unlock();
1182 local_bh_enable();
1183 } else if (ndm->ndm_flags & NTF_EXT_LEARNED) {
1184 if (!p && !(ndm->ndm_state & NUD_PERMANENT)) {
1185 NL_SET_ERR_MSG_MOD(extack,
1186 "FDB entry towards bridge must be permanent");
1187 return -EINVAL;
1188 }
1189 err = br_fdb_external_learn_add(br, p, addr, vid, false, true);
1190 } else {
1191 spin_lock_bh(&br->hash_lock);
1192 err = fdb_add_entry(br, p, addr, ndm, nlh_flags, vid, nfea_tb);
1193 spin_unlock_bh(&br->hash_lock);
1194 }
1195
1196 return err;
1197}
1198
1199static const struct nla_policy br_nda_fdb_pol[NFEA_MAX + 1] = {
1200 [NFEA_ACTIVITY_NOTIFY] = { .type = NLA_U8 },
1201 [NFEA_DONT_REFRESH] = { .type = NLA_FLAG },
1202};
1203
1204/* Add new permanent fdb entry with RTM_NEWNEIGH */
1205int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1206 struct net_device *dev,
1207 const unsigned char *addr, u16 vid, u16 nlh_flags,
1208 struct netlink_ext_ack *extack)
1209{
1210 struct nlattr *nfea_tb[NFEA_MAX + 1], *attr;
1211 struct net_bridge_vlan_group *vg;
1212 struct net_bridge_port *p = NULL;
1213 struct net_bridge_vlan *v;
1214 struct net_bridge *br = NULL;
1215 u32 ext_flags = 0;
1216 int err = 0;
1217
1218 trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags);
1219
1220 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
1221 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
1222 return -EINVAL;
1223 }
1224
1225 if (is_zero_ether_addr(addr)) {
1226 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
1227 return -EINVAL;
1228 }
1229
1230 if (netif_is_bridge_master(dev)) {
1231 br = netdev_priv(dev);
1232 vg = br_vlan_group(br);
1233 } else {
1234 p = br_port_get_rtnl(dev);
1235 if (!p) {
1236 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
1237 dev->name);
1238 return -EINVAL;
1239 }
1240 br = p->br;
1241 vg = nbp_vlan_group(p);
1242 }
1243
1244 if (tb[NDA_FLAGS_EXT])
1245 ext_flags = nla_get_u32(tb[NDA_FLAGS_EXT]);
1246
1247 if (ext_flags & NTF_EXT_LOCKED) {
1248 NL_SET_ERR_MSG_MOD(extack, "Cannot add FDB entry with \"locked\" flag set");
1249 return -EINVAL;
1250 }
1251
1252 if (tb[NDA_FDB_EXT_ATTRS]) {
1253 attr = tb[NDA_FDB_EXT_ATTRS];
1254 err = nla_parse_nested(nfea_tb, NFEA_MAX, attr,
1255 br_nda_fdb_pol, extack);
1256 if (err)
1257 return err;
1258 } else {
1259 memset(nfea_tb, 0, sizeof(struct nlattr *) * (NFEA_MAX + 1));
1260 }
1261
1262 if (vid) {
1263 v = br_vlan_find(vg, vid);
1264 if (!v || !br_vlan_should_use(v)) {
1265 pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1266 return -EINVAL;
1267 }
1268
1269 /* VID was specified, so use it. */
1270 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid, nfea_tb,
1271 extack);
1272 } else {
1273 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0, nfea_tb,
1274 extack);
1275 if (err || !vg || !vg->num_vlans)
1276 goto out;
1277
1278 /* We have vlans configured on this port and user didn't
1279 * specify a VLAN. To be nice, add/update entry for every
1280 * vlan on this port.
1281 */
1282 list_for_each_entry(v, &vg->vlan_list, vlist) {
1283 if (!br_vlan_should_use(v))
1284 continue;
1285 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid,
1286 nfea_tb, extack);
1287 if (err)
1288 goto out;
1289 }
1290 }
1291
1292out:
1293 return err;
1294}
1295
1296static int fdb_delete_by_addr_and_port(struct net_bridge *br,
1297 const struct net_bridge_port *p,
1298 const u8 *addr, u16 vlan)
1299{
1300 struct net_bridge_fdb_entry *fdb;
1301
1302 fdb = br_fdb_find(br, addr, vlan);
1303 if (!fdb || READ_ONCE(fdb->dst) != p)
1304 return -ENOENT;
1305
1306 fdb_delete(br, fdb, true);
1307
1308 return 0;
1309}
1310
1311static int __br_fdb_delete(struct net_bridge *br,
1312 const struct net_bridge_port *p,
1313 const unsigned char *addr, u16 vid)
1314{
1315 int err;
1316
1317 spin_lock_bh(&br->hash_lock);
1318 err = fdb_delete_by_addr_and_port(br, p, addr, vid);
1319 spin_unlock_bh(&br->hash_lock);
1320
1321 return err;
1322}
1323
1324/* Remove neighbor entry with RTM_DELNEIGH */
1325int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1326 struct net_device *dev,
1327 const unsigned char *addr, u16 vid,
1328 struct netlink_ext_ack *extack)
1329{
1330 struct net_bridge_vlan_group *vg;
1331 struct net_bridge_port *p = NULL;
1332 struct net_bridge_vlan *v;
1333 struct net_bridge *br;
1334 int err;
1335
1336 if (netif_is_bridge_master(dev)) {
1337 br = netdev_priv(dev);
1338 vg = br_vlan_group(br);
1339 } else {
1340 p = br_port_get_rtnl(dev);
1341 if (!p) {
1342 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
1343 dev->name);
1344 return -EINVAL;
1345 }
1346 vg = nbp_vlan_group(p);
1347 br = p->br;
1348 }
1349
1350 if (vid) {
1351 v = br_vlan_find(vg, vid);
1352 if (!v) {
1353 pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1354 return -EINVAL;
1355 }
1356
1357 err = __br_fdb_delete(br, p, addr, vid);
1358 } else {
1359 err = -ENOENT;
1360 err &= __br_fdb_delete(br, p, addr, 0);
1361 if (!vg || !vg->num_vlans)
1362 return err;
1363
1364 list_for_each_entry(v, &vg->vlan_list, vlist) {
1365 if (!br_vlan_should_use(v))
1366 continue;
1367 err &= __br_fdb_delete(br, p, addr, v->vid);
1368 }
1369 }
1370
1371 return err;
1372}
1373
1374int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
1375{
1376 struct net_bridge_fdb_entry *f, *tmp;
1377 int err = 0;
1378
1379 ASSERT_RTNL();
1380
1381 /* the key here is that static entries change only under rtnl */
1382 rcu_read_lock();
1383 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1384 /* We only care for static entries */
1385 if (!test_bit(BR_FDB_STATIC, &f->flags))
1386 continue;
1387 err = dev_uc_add(p->dev, f->key.addr.addr);
1388 if (err)
1389 goto rollback;
1390 }
1391done:
1392 rcu_read_unlock();
1393
1394 return err;
1395
1396rollback:
1397 hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) {
1398 /* We only care for static entries */
1399 if (!test_bit(BR_FDB_STATIC, &tmp->flags))
1400 continue;
1401 if (tmp == f)
1402 break;
1403 dev_uc_del(p->dev, tmp->key.addr.addr);
1404 }
1405
1406 goto done;
1407}
1408
1409void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
1410{
1411 struct net_bridge_fdb_entry *f;
1412
1413 ASSERT_RTNL();
1414
1415 rcu_read_lock();
1416 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1417 /* We only care for static entries */
1418 if (!test_bit(BR_FDB_STATIC, &f->flags))
1419 continue;
1420
1421 dev_uc_del(p->dev, f->key.addr.addr);
1422 }
1423 rcu_read_unlock();
1424}
1425
1426int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
1427 const unsigned char *addr, u16 vid, bool locked,
1428 bool swdev_notify)
1429{
1430 struct net_bridge_fdb_entry *fdb;
1431 bool modified = false;
1432 int err = 0;
1433
1434 trace_br_fdb_external_learn_add(br, p, addr, vid);
1435
1436 if (locked && (!p || !(p->flags & BR_PORT_MAB)))
1437 return -EINVAL;
1438
1439 spin_lock_bh(&br->hash_lock);
1440
1441 fdb = br_fdb_find(br, addr, vid);
1442 if (!fdb) {
1443 unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN);
1444
1445 if (swdev_notify)
1446 flags |= BIT(BR_FDB_ADDED_BY_USER);
1447
1448 if (!p)
1449 flags |= BIT(BR_FDB_LOCAL);
1450
1451 if (locked)
1452 flags |= BIT(BR_FDB_LOCKED);
1453
1454 fdb = fdb_create(br, p, addr, vid, flags);
1455 if (!fdb) {
1456 err = -ENOMEM;
1457 goto err_unlock;
1458 }
1459 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1460 } else {
1461 if (locked &&
1462 (!test_bit(BR_FDB_LOCKED, &fdb->flags) ||
1463 READ_ONCE(fdb->dst) != p)) {
1464 err = -EINVAL;
1465 goto err_unlock;
1466 }
1467
1468 fdb->updated = jiffies;
1469
1470 if (READ_ONCE(fdb->dst) != p) {
1471 WRITE_ONCE(fdb->dst, p);
1472 modified = true;
1473 }
1474
1475 if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) {
1476 /* Refresh entry */
1477 fdb->used = jiffies;
1478 } else if (!test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags)) {
1479 /* Take over SW learned entry */
1480 set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags);
1481 modified = true;
1482 }
1483
1484 if (locked != test_bit(BR_FDB_LOCKED, &fdb->flags)) {
1485 change_bit(BR_FDB_LOCKED, &fdb->flags);
1486 modified = true;
1487 }
1488
1489 if (swdev_notify)
1490 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
1491
1492 if (!p)
1493 set_bit(BR_FDB_LOCAL, &fdb->flags);
1494
1495 if ((swdev_notify || !p) &&
1496 test_and_clear_bit(BR_FDB_DYNAMIC_LEARNED, &fdb->flags))
1497 atomic_dec(&br->fdb_n_learned);
1498
1499 if (modified)
1500 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1501 }
1502
1503err_unlock:
1504 spin_unlock_bh(&br->hash_lock);
1505
1506 return err;
1507}
1508
1509int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
1510 const unsigned char *addr, u16 vid,
1511 bool swdev_notify)
1512{
1513 struct net_bridge_fdb_entry *fdb;
1514 int err = 0;
1515
1516 spin_lock_bh(&br->hash_lock);
1517
1518 fdb = br_fdb_find(br, addr, vid);
1519 if (fdb && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
1520 fdb_delete(br, fdb, swdev_notify);
1521 else
1522 err = -ENOENT;
1523
1524 spin_unlock_bh(&br->hash_lock);
1525
1526 return err;
1527}
1528
1529void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
1530 const unsigned char *addr, u16 vid, bool offloaded)
1531{
1532 struct net_bridge_fdb_entry *fdb;
1533
1534 spin_lock_bh(&br->hash_lock);
1535
1536 fdb = br_fdb_find(br, addr, vid);
1537 if (fdb && offloaded != test_bit(BR_FDB_OFFLOADED, &fdb->flags))
1538 change_bit(BR_FDB_OFFLOADED, &fdb->flags);
1539
1540 spin_unlock_bh(&br->hash_lock);
1541}
1542
1543void br_fdb_clear_offload(const struct net_device *dev, u16 vid)
1544{
1545 struct net_bridge_fdb_entry *f;
1546 struct net_bridge_port *p;
1547
1548 ASSERT_RTNL();
1549
1550 p = br_port_get_rtnl(dev);
1551 if (!p)
1552 return;
1553
1554 spin_lock_bh(&p->br->hash_lock);
1555 hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) {
1556 if (f->dst == p && f->key.vlan_id == vid)
1557 clear_bit(BR_FDB_OFFLOADED, &f->flags);
1558 }
1559 spin_unlock_bh(&p->br->hash_lock);
1560}
1561EXPORT_SYMBOL_GPL(br_fdb_clear_offload);