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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 !test_bit(BR_FDB_STATIC, &fdb->flags) &&
79 !test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags) &&
80 time_before_eq(fdb->updated + hold_time(br), jiffies);
81}
82
83static void fdb_rcu_free(struct rcu_head *head)
84{
85 struct net_bridge_fdb_entry *ent
86 = container_of(head, struct net_bridge_fdb_entry, rcu);
87 kmem_cache_free(br_fdb_cache, ent);
88}
89
90static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl,
91 const unsigned char *addr,
92 __u16 vid)
93{
94 struct net_bridge_fdb_key key;
95
96 WARN_ON_ONCE(!rcu_read_lock_held());
97
98 key.vlan_id = vid;
99 memcpy(key.addr.addr, addr, sizeof(key.addr.addr));
100
101 return rhashtable_lookup(tbl, &key, br_fdb_rht_params);
102}
103
104/* requires bridge hash_lock */
105static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br,
106 const unsigned char *addr,
107 __u16 vid)
108{
109 struct net_bridge_fdb_entry *fdb;
110
111 lockdep_assert_held_once(&br->hash_lock);
112
113 rcu_read_lock();
114 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
115 rcu_read_unlock();
116
117 return fdb;
118}
119
120struct net_device *br_fdb_find_port(const struct net_device *br_dev,
121 const unsigned char *addr,
122 __u16 vid)
123{
124 struct net_bridge_fdb_entry *f;
125 struct net_device *dev = NULL;
126 struct net_bridge *br;
127
128 ASSERT_RTNL();
129
130 if (!netif_is_bridge_master(br_dev))
131 return NULL;
132
133 br = netdev_priv(br_dev);
134 rcu_read_lock();
135 f = br_fdb_find_rcu(br, addr, vid);
136 if (f && f->dst)
137 dev = f->dst->dev;
138 rcu_read_unlock();
139
140 return dev;
141}
142EXPORT_SYMBOL_GPL(br_fdb_find_port);
143
144struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
145 const unsigned char *addr,
146 __u16 vid)
147{
148 return fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
149}
150
151/* When a static FDB entry is added, the mac address from the entry is
152 * added to the bridge private HW address list and all required ports
153 * are then updated with the new information.
154 * Called under RTNL.
155 */
156static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr)
157{
158 int err;
159 struct net_bridge_port *p;
160
161 ASSERT_RTNL();
162
163 list_for_each_entry(p, &br->port_list, list) {
164 if (!br_promisc_port(p)) {
165 err = dev_uc_add(p->dev, addr);
166 if (err)
167 goto undo;
168 }
169 }
170
171 return;
172undo:
173 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
174 if (!br_promisc_port(p))
175 dev_uc_del(p->dev, addr);
176 }
177}
178
179/* When a static FDB entry is deleted, the HW address from that entry is
180 * also removed from the bridge private HW address list and updates all
181 * the ports with needed information.
182 * Called under RTNL.
183 */
184static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
185{
186 struct net_bridge_port *p;
187
188 ASSERT_RTNL();
189
190 list_for_each_entry(p, &br->port_list, list) {
191 if (!br_promisc_port(p))
192 dev_uc_del(p->dev, addr);
193 }
194}
195
196static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f,
197 bool swdev_notify)
198{
199 trace_fdb_delete(br, f);
200
201 if (test_bit(BR_FDB_STATIC, &f->flags))
202 fdb_del_hw_addr(br, f->key.addr.addr);
203
204 hlist_del_init_rcu(&f->fdb_node);
205 rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode,
206 br_fdb_rht_params);
207 fdb_notify(br, f, RTM_DELNEIGH, swdev_notify);
208 call_rcu(&f->rcu, fdb_rcu_free);
209}
210
211/* Delete a local entry if no other port had the same address. */
212static void fdb_delete_local(struct net_bridge *br,
213 const struct net_bridge_port *p,
214 struct net_bridge_fdb_entry *f)
215{
216 const unsigned char *addr = f->key.addr.addr;
217 struct net_bridge_vlan_group *vg;
218 const struct net_bridge_vlan *v;
219 struct net_bridge_port *op;
220 u16 vid = f->key.vlan_id;
221
222 /* Maybe another port has same hw addr? */
223 list_for_each_entry(op, &br->port_list, list) {
224 vg = nbp_vlan_group(op);
225 if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
226 (!vid || br_vlan_find(vg, vid))) {
227 f->dst = op;
228 clear_bit(BR_FDB_ADDED_BY_USER, &f->flags);
229 return;
230 }
231 }
232
233 vg = br_vlan_group(br);
234 v = br_vlan_find(vg, vid);
235 /* Maybe bridge device has same hw addr? */
236 if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
237 (!vid || (v && br_vlan_should_use(v)))) {
238 f->dst = NULL;
239 clear_bit(BR_FDB_ADDED_BY_USER, &f->flags);
240 return;
241 }
242
243 fdb_delete(br, f, true);
244}
245
246void br_fdb_find_delete_local(struct net_bridge *br,
247 const struct net_bridge_port *p,
248 const unsigned char *addr, u16 vid)
249{
250 struct net_bridge_fdb_entry *f;
251
252 spin_lock_bh(&br->hash_lock);
253 f = br_fdb_find(br, addr, vid);
254 if (f && test_bit(BR_FDB_LOCAL, &f->flags) &&
255 !test_bit(BR_FDB_ADDED_BY_USER, &f->flags) && f->dst == p)
256 fdb_delete_local(br, p, f);
257 spin_unlock_bh(&br->hash_lock);
258}
259
260void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
261{
262 struct net_bridge_vlan_group *vg;
263 struct net_bridge_fdb_entry *f;
264 struct net_bridge *br = p->br;
265 struct net_bridge_vlan *v;
266
267 spin_lock_bh(&br->hash_lock);
268 vg = nbp_vlan_group(p);
269 hlist_for_each_entry(f, &br->fdb_list, fdb_node) {
270 if (f->dst == p && test_bit(BR_FDB_LOCAL, &f->flags) &&
271 !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) {
272 /* delete old one */
273 fdb_delete_local(br, p, f);
274
275 /* if this port has no vlan information
276 * configured, we can safely be done at
277 * this point.
278 */
279 if (!vg || !vg->num_vlans)
280 goto insert;
281 }
282 }
283
284insert:
285 /* insert new address, may fail if invalid address or dup. */
286 fdb_insert(br, p, newaddr, 0);
287
288 if (!vg || !vg->num_vlans)
289 goto done;
290
291 /* Now add entries for every VLAN configured on the port.
292 * This function runs under RTNL so the bitmap will not change
293 * from under us.
294 */
295 list_for_each_entry(v, &vg->vlan_list, vlist)
296 fdb_insert(br, p, newaddr, v->vid);
297
298done:
299 spin_unlock_bh(&br->hash_lock);
300}
301
302void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
303{
304 struct net_bridge_vlan_group *vg;
305 struct net_bridge_fdb_entry *f;
306 struct net_bridge_vlan *v;
307
308 spin_lock_bh(&br->hash_lock);
309
310 /* If old entry was unassociated with any port, then delete it. */
311 f = br_fdb_find(br, br->dev->dev_addr, 0);
312 if (f && test_bit(BR_FDB_LOCAL, &f->flags) &&
313 !f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags))
314 fdb_delete_local(br, NULL, f);
315
316 fdb_insert(br, NULL, newaddr, 0);
317 vg = br_vlan_group(br);
318 if (!vg || !vg->num_vlans)
319 goto out;
320 /* Now remove and add entries for every VLAN configured on the
321 * bridge. This function runs under RTNL so the bitmap will not
322 * change from under us.
323 */
324 list_for_each_entry(v, &vg->vlan_list, vlist) {
325 if (!br_vlan_should_use(v))
326 continue;
327 f = br_fdb_find(br, br->dev->dev_addr, v->vid);
328 if (f && test_bit(BR_FDB_LOCAL, &f->flags) &&
329 !f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags))
330 fdb_delete_local(br, NULL, f);
331 fdb_insert(br, NULL, newaddr, v->vid);
332 }
333out:
334 spin_unlock_bh(&br->hash_lock);
335}
336
337void br_fdb_cleanup(struct work_struct *work)
338{
339 struct net_bridge *br = container_of(work, struct net_bridge,
340 gc_work.work);
341 struct net_bridge_fdb_entry *f = NULL;
342 unsigned long delay = hold_time(br);
343 unsigned long work_delay = delay;
344 unsigned long now = jiffies;
345
346 /* this part is tricky, in order to avoid blocking learning and
347 * consequently forwarding, we rely on rcu to delete objects with
348 * delayed freeing allowing us to continue traversing
349 */
350 rcu_read_lock();
351 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
352 unsigned long this_timer = f->updated + delay;
353
354 if (test_bit(BR_FDB_STATIC, &f->flags) ||
355 test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags)) {
356 if (test_bit(BR_FDB_NOTIFY, &f->flags)) {
357 if (time_after(this_timer, now))
358 work_delay = min(work_delay,
359 this_timer - now);
360 else if (!test_and_set_bit(BR_FDB_NOTIFY_INACTIVE,
361 &f->flags))
362 fdb_notify(br, f, RTM_NEWNEIGH, false);
363 }
364 continue;
365 }
366
367 if (time_after(this_timer, now)) {
368 work_delay = min(work_delay, this_timer - now);
369 } else {
370 spin_lock_bh(&br->hash_lock);
371 if (!hlist_unhashed(&f->fdb_node))
372 fdb_delete(br, f, true);
373 spin_unlock_bh(&br->hash_lock);
374 }
375 }
376 rcu_read_unlock();
377
378 /* Cleanup minimum 10 milliseconds apart */
379 work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10));
380 mod_delayed_work(system_long_wq, &br->gc_work, work_delay);
381}
382
383/* Completely flush all dynamic entries in forwarding database.*/
384void br_fdb_flush(struct net_bridge *br)
385{
386 struct net_bridge_fdb_entry *f;
387 struct hlist_node *tmp;
388
389 spin_lock_bh(&br->hash_lock);
390 hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
391 if (!test_bit(BR_FDB_STATIC, &f->flags))
392 fdb_delete(br, f, true);
393 }
394 spin_unlock_bh(&br->hash_lock);
395}
396
397/* Flush all entries referring to a specific port.
398 * if do_all is set also flush static entries
399 * if vid is set delete all entries that match the vlan_id
400 */
401void br_fdb_delete_by_port(struct net_bridge *br,
402 const struct net_bridge_port *p,
403 u16 vid,
404 int do_all)
405{
406 struct net_bridge_fdb_entry *f;
407 struct hlist_node *tmp;
408
409 spin_lock_bh(&br->hash_lock);
410 hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
411 if (f->dst != p)
412 continue;
413
414 if (!do_all)
415 if (test_bit(BR_FDB_STATIC, &f->flags) ||
416 (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags) &&
417 !test_bit(BR_FDB_OFFLOADED, &f->flags)) ||
418 (vid && f->key.vlan_id != vid))
419 continue;
420
421 if (test_bit(BR_FDB_LOCAL, &f->flags))
422 fdb_delete_local(br, p, f);
423 else
424 fdb_delete(br, f, true);
425 }
426 spin_unlock_bh(&br->hash_lock);
427}
428
429#if IS_ENABLED(CONFIG_ATM_LANE)
430/* Interface used by ATM LANE hook to test
431 * if an addr is on some other bridge port */
432int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
433{
434 struct net_bridge_fdb_entry *fdb;
435 struct net_bridge_port *port;
436 int ret;
437
438 rcu_read_lock();
439 port = br_port_get_rcu(dev);
440 if (!port)
441 ret = 0;
442 else {
443 fdb = br_fdb_find_rcu(port->br, addr, 0);
444 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
445 fdb->dst->state == BR_STATE_FORWARDING;
446 }
447 rcu_read_unlock();
448
449 return ret;
450}
451#endif /* CONFIG_ATM_LANE */
452
453/*
454 * Fill buffer with forwarding table records in
455 * the API format.
456 */
457int br_fdb_fillbuf(struct net_bridge *br, void *buf,
458 unsigned long maxnum, unsigned long skip)
459{
460 struct net_bridge_fdb_entry *f;
461 struct __fdb_entry *fe = buf;
462 int num = 0;
463
464 memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
465
466 rcu_read_lock();
467 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
468 if (num >= maxnum)
469 break;
470
471 if (has_expired(br, f))
472 continue;
473
474 /* ignore pseudo entry for local MAC address */
475 if (!f->dst)
476 continue;
477
478 if (skip) {
479 --skip;
480 continue;
481 }
482
483 /* convert from internal format to API */
484 memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN);
485
486 /* due to ABI compat need to split into hi/lo */
487 fe->port_no = f->dst->port_no;
488 fe->port_hi = f->dst->port_no >> 8;
489
490 fe->is_local = test_bit(BR_FDB_LOCAL, &f->flags);
491 if (!test_bit(BR_FDB_STATIC, &f->flags))
492 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
493 ++fe;
494 ++num;
495 }
496 rcu_read_unlock();
497
498 return num;
499}
500
501static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
502 struct net_bridge_port *source,
503 const unsigned char *addr,
504 __u16 vid,
505 unsigned long flags)
506{
507 struct net_bridge_fdb_entry *fdb;
508
509 fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
510 if (fdb) {
511 memcpy(fdb->key.addr.addr, addr, ETH_ALEN);
512 fdb->dst = source;
513 fdb->key.vlan_id = vid;
514 fdb->flags = flags;
515 fdb->updated = fdb->used = jiffies;
516 if (rhashtable_lookup_insert_fast(&br->fdb_hash_tbl,
517 &fdb->rhnode,
518 br_fdb_rht_params)) {
519 kmem_cache_free(br_fdb_cache, fdb);
520 fdb = NULL;
521 } else {
522 hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list);
523 }
524 }
525 return fdb;
526}
527
528static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
529 const unsigned char *addr, u16 vid)
530{
531 struct net_bridge_fdb_entry *fdb;
532
533 if (!is_valid_ether_addr(addr))
534 return -EINVAL;
535
536 fdb = br_fdb_find(br, addr, vid);
537 if (fdb) {
538 /* it is okay to have multiple ports with same
539 * address, just use the first one.
540 */
541 if (test_bit(BR_FDB_LOCAL, &fdb->flags))
542 return 0;
543 br_warn(br, "adding interface %s with same address as a received packet (addr:%pM, vlan:%u)\n",
544 source ? source->dev->name : br->dev->name, addr, vid);
545 fdb_delete(br, fdb, true);
546 }
547
548 fdb = fdb_create(br, source, addr, vid,
549 BIT(BR_FDB_LOCAL) | BIT(BR_FDB_STATIC));
550 if (!fdb)
551 return -ENOMEM;
552
553 fdb_add_hw_addr(br, addr);
554 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
555 return 0;
556}
557
558/* Add entry for local address of interface */
559int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
560 const unsigned char *addr, u16 vid)
561{
562 int ret;
563
564 spin_lock_bh(&br->hash_lock);
565 ret = fdb_insert(br, source, addr, vid);
566 spin_unlock_bh(&br->hash_lock);
567 return ret;
568}
569
570/* returns true if the fdb was modified */
571static bool __fdb_mark_active(struct net_bridge_fdb_entry *fdb)
572{
573 return !!(test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags) &&
574 test_and_clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags));
575}
576
577void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
578 const unsigned char *addr, u16 vid, unsigned long flags)
579{
580 struct net_bridge_fdb_entry *fdb;
581
582 /* some users want to always flood. */
583 if (hold_time(br) == 0)
584 return;
585
586 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
587 if (likely(fdb)) {
588 /* attempt to update an entry for a local interface */
589 if (unlikely(test_bit(BR_FDB_LOCAL, &fdb->flags))) {
590 if (net_ratelimit())
591 br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n",
592 source->dev->name, addr, vid);
593 } else {
594 unsigned long now = jiffies;
595 bool fdb_modified = false;
596
597 if (now != fdb->updated) {
598 fdb->updated = now;
599 fdb_modified = __fdb_mark_active(fdb);
600 }
601
602 /* fastpath: update of existing entry */
603 if (unlikely(source != fdb->dst &&
604 !test_bit(BR_FDB_STICKY, &fdb->flags))) {
605 fdb->dst = source;
606 fdb_modified = true;
607 /* Take over HW learned entry */
608 if (unlikely(test_bit(BR_FDB_ADDED_BY_EXT_LEARN,
609 &fdb->flags)))
610 clear_bit(BR_FDB_ADDED_BY_EXT_LEARN,
611 &fdb->flags);
612 }
613
614 if (unlikely(test_bit(BR_FDB_ADDED_BY_USER, &flags)))
615 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
616 if (unlikely(fdb_modified)) {
617 trace_br_fdb_update(br, source, addr, vid, flags);
618 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
619 }
620 }
621 } else {
622 spin_lock(&br->hash_lock);
623 fdb = fdb_create(br, source, addr, vid, flags);
624 if (fdb) {
625 trace_br_fdb_update(br, source, addr, vid, flags);
626 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
627 }
628 /* else we lose race and someone else inserts
629 * it first, don't bother updating
630 */
631 spin_unlock(&br->hash_lock);
632 }
633}
634
635static int fdb_to_nud(const struct net_bridge *br,
636 const struct net_bridge_fdb_entry *fdb)
637{
638 if (test_bit(BR_FDB_LOCAL, &fdb->flags))
639 return NUD_PERMANENT;
640 else if (test_bit(BR_FDB_STATIC, &fdb->flags))
641 return NUD_NOARP;
642 else if (has_expired(br, fdb))
643 return NUD_STALE;
644 else
645 return NUD_REACHABLE;
646}
647
648static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
649 const struct net_bridge_fdb_entry *fdb,
650 u32 portid, u32 seq, int type, unsigned int flags)
651{
652 unsigned long now = jiffies;
653 struct nda_cacheinfo ci;
654 struct nlmsghdr *nlh;
655 struct ndmsg *ndm;
656
657 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
658 if (nlh == NULL)
659 return -EMSGSIZE;
660
661 ndm = nlmsg_data(nlh);
662 ndm->ndm_family = AF_BRIDGE;
663 ndm->ndm_pad1 = 0;
664 ndm->ndm_pad2 = 0;
665 ndm->ndm_flags = 0;
666 ndm->ndm_type = 0;
667 ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
668 ndm->ndm_state = fdb_to_nud(br, fdb);
669
670 if (test_bit(BR_FDB_OFFLOADED, &fdb->flags))
671 ndm->ndm_flags |= NTF_OFFLOADED;
672 if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
673 ndm->ndm_flags |= NTF_EXT_LEARNED;
674 if (test_bit(BR_FDB_STICKY, &fdb->flags))
675 ndm->ndm_flags |= NTF_STICKY;
676
677 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.addr))
678 goto nla_put_failure;
679 if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
680 goto nla_put_failure;
681 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
682 ci.ndm_confirmed = 0;
683 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
684 ci.ndm_refcnt = 0;
685 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
686 goto nla_put_failure;
687
688 if (fdb->key.vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16),
689 &fdb->key.vlan_id))
690 goto nla_put_failure;
691
692 if (test_bit(BR_FDB_NOTIFY, &fdb->flags)) {
693 struct nlattr *nest = nla_nest_start(skb, NDA_FDB_EXT_ATTRS);
694 u8 notify_bits = FDB_NOTIFY_BIT;
695
696 if (!nest)
697 goto nla_put_failure;
698 if (test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags))
699 notify_bits |= FDB_NOTIFY_INACTIVE_BIT;
700
701 if (nla_put_u8(skb, NFEA_ACTIVITY_NOTIFY, notify_bits)) {
702 nla_nest_cancel(skb, nest);
703 goto nla_put_failure;
704 }
705
706 nla_nest_end(skb, nest);
707 }
708
709 nlmsg_end(skb, nlh);
710 return 0;
711
712nla_put_failure:
713 nlmsg_cancel(skb, nlh);
714 return -EMSGSIZE;
715}
716
717static inline size_t fdb_nlmsg_size(void)
718{
719 return NLMSG_ALIGN(sizeof(struct ndmsg))
720 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
721 + nla_total_size(sizeof(u32)) /* NDA_MASTER */
722 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
723 + nla_total_size(sizeof(struct nda_cacheinfo))
724 + nla_total_size(0) /* NDA_FDB_EXT_ATTRS */
725 + nla_total_size(sizeof(u8)); /* NFEA_ACTIVITY_NOTIFY */
726}
727
728static void fdb_notify(struct net_bridge *br,
729 const struct net_bridge_fdb_entry *fdb, int type,
730 bool swdev_notify)
731{
732 struct net *net = dev_net(br->dev);
733 struct sk_buff *skb;
734 int err = -ENOBUFS;
735
736 if (swdev_notify)
737 br_switchdev_fdb_notify(fdb, type);
738
739 skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
740 if (skb == NULL)
741 goto errout;
742
743 err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
744 if (err < 0) {
745 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
746 WARN_ON(err == -EMSGSIZE);
747 kfree_skb(skb);
748 goto errout;
749 }
750 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
751 return;
752errout:
753 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
754}
755
756/* Dump information about entries, in response to GETNEIGH */
757int br_fdb_dump(struct sk_buff *skb,
758 struct netlink_callback *cb,
759 struct net_device *dev,
760 struct net_device *filter_dev,
761 int *idx)
762{
763 struct net_bridge *br = netdev_priv(dev);
764 struct net_bridge_fdb_entry *f;
765 int err = 0;
766
767 if (!(dev->priv_flags & IFF_EBRIDGE))
768 return err;
769
770 if (!filter_dev) {
771 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
772 if (err < 0)
773 return err;
774 }
775
776 rcu_read_lock();
777 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
778 if (*idx < cb->args[2])
779 goto skip;
780 if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) {
781 if (filter_dev != dev)
782 goto skip;
783 /* !f->dst is a special case for bridge
784 * It means the MAC belongs to the bridge
785 * Therefore need a little more filtering
786 * we only want to dump the !f->dst case
787 */
788 if (f->dst)
789 goto skip;
790 }
791 if (!filter_dev && f->dst)
792 goto skip;
793
794 err = fdb_fill_info(skb, br, f,
795 NETLINK_CB(cb->skb).portid,
796 cb->nlh->nlmsg_seq,
797 RTM_NEWNEIGH,
798 NLM_F_MULTI);
799 if (err < 0)
800 break;
801skip:
802 *idx += 1;
803 }
804 rcu_read_unlock();
805
806 return err;
807}
808
809int br_fdb_get(struct sk_buff *skb,
810 struct nlattr *tb[],
811 struct net_device *dev,
812 const unsigned char *addr,
813 u16 vid, u32 portid, u32 seq,
814 struct netlink_ext_ack *extack)
815{
816 struct net_bridge *br = netdev_priv(dev);
817 struct net_bridge_fdb_entry *f;
818 int err = 0;
819
820 rcu_read_lock();
821 f = br_fdb_find_rcu(br, addr, vid);
822 if (!f) {
823 NL_SET_ERR_MSG(extack, "Fdb entry not found");
824 err = -ENOENT;
825 goto errout;
826 }
827
828 err = fdb_fill_info(skb, br, f, portid, seq,
829 RTM_NEWNEIGH, 0);
830errout:
831 rcu_read_unlock();
832 return err;
833}
834
835/* returns true if the fdb is modified */
836static bool fdb_handle_notify(struct net_bridge_fdb_entry *fdb, u8 notify)
837{
838 bool modified = false;
839
840 /* allow to mark an entry as inactive, usually done on creation */
841 if ((notify & FDB_NOTIFY_INACTIVE_BIT) &&
842 !test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags))
843 modified = true;
844
845 if ((notify & FDB_NOTIFY_BIT) &&
846 !test_and_set_bit(BR_FDB_NOTIFY, &fdb->flags)) {
847 /* enabled activity tracking */
848 modified = true;
849 } else if (!(notify & FDB_NOTIFY_BIT) &&
850 test_and_clear_bit(BR_FDB_NOTIFY, &fdb->flags)) {
851 /* disabled activity tracking, clear notify state */
852 clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags);
853 modified = true;
854 }
855
856 return modified;
857}
858
859/* Update (create or replace) forwarding database entry */
860static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
861 const u8 *addr, struct ndmsg *ndm, u16 flags, u16 vid,
862 struct nlattr *nfea_tb[])
863{
864 bool is_sticky = !!(ndm->ndm_flags & NTF_STICKY);
865 bool refresh = !nfea_tb[NFEA_DONT_REFRESH];
866 struct net_bridge_fdb_entry *fdb;
867 u16 state = ndm->ndm_state;
868 bool modified = false;
869 u8 notify = 0;
870
871 /* If the port cannot learn allow only local and static entries */
872 if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
873 !(source->state == BR_STATE_LEARNING ||
874 source->state == BR_STATE_FORWARDING))
875 return -EPERM;
876
877 if (!source && !(state & NUD_PERMANENT)) {
878 pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n",
879 br->dev->name);
880 return -EINVAL;
881 }
882
883 if (is_sticky && (state & NUD_PERMANENT))
884 return -EINVAL;
885
886 if (nfea_tb[NFEA_ACTIVITY_NOTIFY]) {
887 notify = nla_get_u8(nfea_tb[NFEA_ACTIVITY_NOTIFY]);
888 if ((notify & ~BR_FDB_NOTIFY_SETTABLE_BITS) ||
889 (notify & BR_FDB_NOTIFY_SETTABLE_BITS) == FDB_NOTIFY_INACTIVE_BIT)
890 return -EINVAL;
891 }
892
893 fdb = br_fdb_find(br, addr, vid);
894 if (fdb == NULL) {
895 if (!(flags & NLM_F_CREATE))
896 return -ENOENT;
897
898 fdb = fdb_create(br, source, addr, vid, 0);
899 if (!fdb)
900 return -ENOMEM;
901
902 modified = true;
903 } else {
904 if (flags & NLM_F_EXCL)
905 return -EEXIST;
906
907 if (fdb->dst != source) {
908 fdb->dst = source;
909 modified = true;
910 }
911 }
912
913 if (fdb_to_nud(br, fdb) != state) {
914 if (state & NUD_PERMANENT) {
915 set_bit(BR_FDB_LOCAL, &fdb->flags);
916 if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags))
917 fdb_add_hw_addr(br, addr);
918 } else if (state & NUD_NOARP) {
919 clear_bit(BR_FDB_LOCAL, &fdb->flags);
920 if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags))
921 fdb_add_hw_addr(br, addr);
922 } else {
923 clear_bit(BR_FDB_LOCAL, &fdb->flags);
924 if (test_and_clear_bit(BR_FDB_STATIC, &fdb->flags))
925 fdb_del_hw_addr(br, addr);
926 }
927
928 modified = true;
929 }
930
931 if (is_sticky != test_bit(BR_FDB_STICKY, &fdb->flags)) {
932 change_bit(BR_FDB_STICKY, &fdb->flags);
933 modified = true;
934 }
935
936 if (fdb_handle_notify(fdb, notify))
937 modified = true;
938
939 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
940
941 fdb->used = jiffies;
942 if (modified) {
943 if (refresh)
944 fdb->updated = jiffies;
945 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
946 }
947
948 return 0;
949}
950
951static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
952 struct net_bridge_port *p, const unsigned char *addr,
953 u16 nlh_flags, u16 vid, struct nlattr *nfea_tb[])
954{
955 int err = 0;
956
957 if (ndm->ndm_flags & NTF_USE) {
958 if (!p) {
959 pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n",
960 br->dev->name);
961 return -EINVAL;
962 }
963 if (!nbp_state_should_learn(p))
964 return 0;
965
966 local_bh_disable();
967 rcu_read_lock();
968 br_fdb_update(br, p, addr, vid, BIT(BR_FDB_ADDED_BY_USER));
969 rcu_read_unlock();
970 local_bh_enable();
971 } else if (ndm->ndm_flags & NTF_EXT_LEARNED) {
972 err = br_fdb_external_learn_add(br, p, addr, vid, true);
973 } else {
974 spin_lock_bh(&br->hash_lock);
975 err = fdb_add_entry(br, p, addr, ndm, nlh_flags, vid, nfea_tb);
976 spin_unlock_bh(&br->hash_lock);
977 }
978
979 return err;
980}
981
982static const struct nla_policy br_nda_fdb_pol[NFEA_MAX + 1] = {
983 [NFEA_ACTIVITY_NOTIFY] = { .type = NLA_U8 },
984 [NFEA_DONT_REFRESH] = { .type = NLA_FLAG },
985};
986
987/* Add new permanent fdb entry with RTM_NEWNEIGH */
988int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
989 struct net_device *dev,
990 const unsigned char *addr, u16 vid, u16 nlh_flags,
991 struct netlink_ext_ack *extack)
992{
993 struct nlattr *nfea_tb[NFEA_MAX + 1], *attr;
994 struct net_bridge_vlan_group *vg;
995 struct net_bridge_port *p = NULL;
996 struct net_bridge_vlan *v;
997 struct net_bridge *br = NULL;
998 int err = 0;
999
1000 trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags);
1001
1002 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
1003 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
1004 return -EINVAL;
1005 }
1006
1007 if (is_zero_ether_addr(addr)) {
1008 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
1009 return -EINVAL;
1010 }
1011
1012 if (dev->priv_flags & IFF_EBRIDGE) {
1013 br = netdev_priv(dev);
1014 vg = br_vlan_group(br);
1015 } else {
1016 p = br_port_get_rtnl(dev);
1017 if (!p) {
1018 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
1019 dev->name);
1020 return -EINVAL;
1021 }
1022 br = p->br;
1023 vg = nbp_vlan_group(p);
1024 }
1025
1026 if (tb[NDA_FDB_EXT_ATTRS]) {
1027 attr = tb[NDA_FDB_EXT_ATTRS];
1028 err = nla_parse_nested(nfea_tb, NFEA_MAX, attr,
1029 br_nda_fdb_pol, extack);
1030 if (err)
1031 return err;
1032 } else {
1033 memset(nfea_tb, 0, sizeof(struct nlattr *) * (NFEA_MAX + 1));
1034 }
1035
1036 if (vid) {
1037 v = br_vlan_find(vg, vid);
1038 if (!v || !br_vlan_should_use(v)) {
1039 pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1040 return -EINVAL;
1041 }
1042
1043 /* VID was specified, so use it. */
1044 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid, nfea_tb);
1045 } else {
1046 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0, nfea_tb);
1047 if (err || !vg || !vg->num_vlans)
1048 goto out;
1049
1050 /* We have vlans configured on this port and user didn't
1051 * specify a VLAN. To be nice, add/update entry for every
1052 * vlan on this port.
1053 */
1054 list_for_each_entry(v, &vg->vlan_list, vlist) {
1055 if (!br_vlan_should_use(v))
1056 continue;
1057 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid,
1058 nfea_tb);
1059 if (err)
1060 goto out;
1061 }
1062 }
1063
1064out:
1065 return err;
1066}
1067
1068static int fdb_delete_by_addr_and_port(struct net_bridge *br,
1069 const struct net_bridge_port *p,
1070 const u8 *addr, u16 vlan)
1071{
1072 struct net_bridge_fdb_entry *fdb;
1073
1074 fdb = br_fdb_find(br, addr, vlan);
1075 if (!fdb || fdb->dst != p)
1076 return -ENOENT;
1077
1078 fdb_delete(br, fdb, true);
1079
1080 return 0;
1081}
1082
1083static int __br_fdb_delete(struct net_bridge *br,
1084 const struct net_bridge_port *p,
1085 const unsigned char *addr, u16 vid)
1086{
1087 int err;
1088
1089 spin_lock_bh(&br->hash_lock);
1090 err = fdb_delete_by_addr_and_port(br, p, addr, vid);
1091 spin_unlock_bh(&br->hash_lock);
1092
1093 return err;
1094}
1095
1096/* Remove neighbor entry with RTM_DELNEIGH */
1097int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1098 struct net_device *dev,
1099 const unsigned char *addr, u16 vid)
1100{
1101 struct net_bridge_vlan_group *vg;
1102 struct net_bridge_port *p = NULL;
1103 struct net_bridge_vlan *v;
1104 struct net_bridge *br;
1105 int err;
1106
1107 if (dev->priv_flags & IFF_EBRIDGE) {
1108 br = netdev_priv(dev);
1109 vg = br_vlan_group(br);
1110 } else {
1111 p = br_port_get_rtnl(dev);
1112 if (!p) {
1113 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
1114 dev->name);
1115 return -EINVAL;
1116 }
1117 vg = nbp_vlan_group(p);
1118 br = p->br;
1119 }
1120
1121 if (vid) {
1122 v = br_vlan_find(vg, vid);
1123 if (!v) {
1124 pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1125 return -EINVAL;
1126 }
1127
1128 err = __br_fdb_delete(br, p, addr, vid);
1129 } else {
1130 err = -ENOENT;
1131 err &= __br_fdb_delete(br, p, addr, 0);
1132 if (!vg || !vg->num_vlans)
1133 return err;
1134
1135 list_for_each_entry(v, &vg->vlan_list, vlist) {
1136 if (!br_vlan_should_use(v))
1137 continue;
1138 err &= __br_fdb_delete(br, p, addr, v->vid);
1139 }
1140 }
1141
1142 return err;
1143}
1144
1145int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
1146{
1147 struct net_bridge_fdb_entry *f, *tmp;
1148 int err = 0;
1149
1150 ASSERT_RTNL();
1151
1152 /* the key here is that static entries change only under rtnl */
1153 rcu_read_lock();
1154 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1155 /* We only care for static entries */
1156 if (!test_bit(BR_FDB_STATIC, &f->flags))
1157 continue;
1158 err = dev_uc_add(p->dev, f->key.addr.addr);
1159 if (err)
1160 goto rollback;
1161 }
1162done:
1163 rcu_read_unlock();
1164
1165 return err;
1166
1167rollback:
1168 hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) {
1169 /* We only care for static entries */
1170 if (!test_bit(BR_FDB_STATIC, &tmp->flags))
1171 continue;
1172 if (tmp == f)
1173 break;
1174 dev_uc_del(p->dev, tmp->key.addr.addr);
1175 }
1176
1177 goto done;
1178}
1179
1180void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
1181{
1182 struct net_bridge_fdb_entry *f;
1183
1184 ASSERT_RTNL();
1185
1186 rcu_read_lock();
1187 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1188 /* We only care for static entries */
1189 if (!test_bit(BR_FDB_STATIC, &f->flags))
1190 continue;
1191
1192 dev_uc_del(p->dev, f->key.addr.addr);
1193 }
1194 rcu_read_unlock();
1195}
1196
1197int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
1198 const unsigned char *addr, u16 vid,
1199 bool swdev_notify)
1200{
1201 struct net_bridge_fdb_entry *fdb;
1202 bool modified = false;
1203 int err = 0;
1204
1205 trace_br_fdb_external_learn_add(br, p, addr, vid);
1206
1207 spin_lock_bh(&br->hash_lock);
1208
1209 fdb = br_fdb_find(br, addr, vid);
1210 if (!fdb) {
1211 unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN);
1212
1213 if (swdev_notify)
1214 flags |= BIT(BR_FDB_ADDED_BY_USER);
1215 fdb = fdb_create(br, p, addr, vid, flags);
1216 if (!fdb) {
1217 err = -ENOMEM;
1218 goto err_unlock;
1219 }
1220 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1221 } else {
1222 fdb->updated = jiffies;
1223
1224 if (fdb->dst != p) {
1225 fdb->dst = p;
1226 modified = true;
1227 }
1228
1229 if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) {
1230 /* Refresh entry */
1231 fdb->used = jiffies;
1232 } else if (!test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags)) {
1233 /* Take over SW learned entry */
1234 set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags);
1235 modified = true;
1236 }
1237
1238 if (swdev_notify)
1239 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
1240
1241 if (modified)
1242 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1243 }
1244
1245err_unlock:
1246 spin_unlock_bh(&br->hash_lock);
1247
1248 return err;
1249}
1250
1251int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
1252 const unsigned char *addr, u16 vid,
1253 bool swdev_notify)
1254{
1255 struct net_bridge_fdb_entry *fdb;
1256 int err = 0;
1257
1258 spin_lock_bh(&br->hash_lock);
1259
1260 fdb = br_fdb_find(br, addr, vid);
1261 if (fdb && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
1262 fdb_delete(br, fdb, swdev_notify);
1263 else
1264 err = -ENOENT;
1265
1266 spin_unlock_bh(&br->hash_lock);
1267
1268 return err;
1269}
1270
1271void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
1272 const unsigned char *addr, u16 vid, bool offloaded)
1273{
1274 struct net_bridge_fdb_entry *fdb;
1275
1276 spin_lock_bh(&br->hash_lock);
1277
1278 fdb = br_fdb_find(br, addr, vid);
1279 if (fdb && offloaded != test_bit(BR_FDB_OFFLOADED, &fdb->flags))
1280 change_bit(BR_FDB_OFFLOADED, &fdb->flags);
1281
1282 spin_unlock_bh(&br->hash_lock);
1283}
1284
1285void br_fdb_clear_offload(const struct net_device *dev, u16 vid)
1286{
1287 struct net_bridge_fdb_entry *f;
1288 struct net_bridge_port *p;
1289
1290 ASSERT_RTNL();
1291
1292 p = br_port_get_rtnl(dev);
1293 if (!p)
1294 return;
1295
1296 spin_lock_bh(&p->br->hash_lock);
1297 hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) {
1298 if (f->dst == p && f->key.vlan_id == vid)
1299 clear_bit(BR_FDB_OFFLOADED, &f->flags);
1300 }
1301 spin_unlock_bh(&p->br->hash_lock);
1302}
1303EXPORT_SYMBOL_GPL(br_fdb_clear_offload);
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 <net/switchdev.h>
28#include "br_private.h"
29
30static struct kmem_cache *br_fdb_cache __read_mostly;
31static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
32 const unsigned char *addr,
33 __u16 vid);
34static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
35 const unsigned char *addr, u16 vid);
36static void fdb_notify(struct net_bridge *br,
37 const struct net_bridge_fdb_entry *, int);
38
39static u32 fdb_salt __read_mostly;
40
41int __init br_fdb_init(void)
42{
43 br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
44 sizeof(struct net_bridge_fdb_entry),
45 0,
46 SLAB_HWCACHE_ALIGN, NULL);
47 if (!br_fdb_cache)
48 return -ENOMEM;
49
50 get_random_bytes(&fdb_salt, sizeof(fdb_salt));
51 return 0;
52}
53
54void br_fdb_fini(void)
55{
56 kmem_cache_destroy(br_fdb_cache);
57}
58
59
60/* if topology_changing then use forward_delay (default 15 sec)
61 * otherwise keep longer (default 5 minutes)
62 */
63static inline unsigned long hold_time(const struct net_bridge *br)
64{
65 return br->topology_change ? br->forward_delay : br->ageing_time;
66}
67
68static inline int has_expired(const struct net_bridge *br,
69 const struct net_bridge_fdb_entry *fdb)
70{
71 return !fdb->is_static &&
72 time_before_eq(fdb->updated + hold_time(br), jiffies);
73}
74
75static inline int br_mac_hash(const unsigned char *mac, __u16 vid)
76{
77 /* use 1 byte of OUI and 3 bytes of NIC */
78 u32 key = get_unaligned((u32 *)(mac + 2));
79 return jhash_2words(key, vid, fdb_salt) & (BR_HASH_SIZE - 1);
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
89/* When a static FDB entry is added, the mac address from the entry is
90 * added to the bridge private HW address list and all required ports
91 * are then updated with the new information.
92 * Called under RTNL.
93 */
94static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr)
95{
96 int err;
97 struct net_bridge_port *p;
98
99 ASSERT_RTNL();
100
101 list_for_each_entry(p, &br->port_list, list) {
102 if (!br_promisc_port(p)) {
103 err = dev_uc_add(p->dev, addr);
104 if (err)
105 goto undo;
106 }
107 }
108
109 return;
110undo:
111 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
112 if (!br_promisc_port(p))
113 dev_uc_del(p->dev, addr);
114 }
115}
116
117/* When a static FDB entry is deleted, the HW address from that entry is
118 * also removed from the bridge private HW address list and updates all
119 * the ports with needed information.
120 * Called under RTNL.
121 */
122static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
123{
124 struct net_bridge_port *p;
125
126 ASSERT_RTNL();
127
128 list_for_each_entry(p, &br->port_list, list) {
129 if (!br_promisc_port(p))
130 dev_uc_del(p->dev, addr);
131 }
132}
133
134static void fdb_del_external_learn(struct net_bridge_fdb_entry *f)
135{
136 struct switchdev_obj_port_fdb fdb = {
137 .obj = {
138 .orig_dev = f->dst->dev,
139 .id = SWITCHDEV_OBJ_ID_PORT_FDB,
140 .flags = SWITCHDEV_F_DEFER,
141 },
142 .vid = f->vlan_id,
143 };
144
145 ether_addr_copy(fdb.addr, f->addr.addr);
146 switchdev_port_obj_del(f->dst->dev, &fdb.obj);
147}
148
149static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
150{
151 if (f->is_static)
152 fdb_del_hw_addr(br, f->addr.addr);
153
154 if (f->added_by_external_learn)
155 fdb_del_external_learn(f);
156
157 hlist_del_rcu(&f->hlist);
158 fdb_notify(br, f, RTM_DELNEIGH);
159 call_rcu(&f->rcu, fdb_rcu_free);
160}
161
162/* Delete a local entry if no other port had the same address. */
163static void fdb_delete_local(struct net_bridge *br,
164 const struct net_bridge_port *p,
165 struct net_bridge_fdb_entry *f)
166{
167 const unsigned char *addr = f->addr.addr;
168 struct net_bridge_vlan_group *vg;
169 const struct net_bridge_vlan *v;
170 struct net_bridge_port *op;
171 u16 vid = f->vlan_id;
172
173 /* Maybe another port has same hw addr? */
174 list_for_each_entry(op, &br->port_list, list) {
175 vg = nbp_vlan_group(op);
176 if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
177 (!vid || br_vlan_find(vg, vid))) {
178 f->dst = op;
179 f->added_by_user = 0;
180 return;
181 }
182 }
183
184 vg = br_vlan_group(br);
185 v = br_vlan_find(vg, vid);
186 /* Maybe bridge device has same hw addr? */
187 if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
188 (!vid || (v && br_vlan_should_use(v)))) {
189 f->dst = NULL;
190 f->added_by_user = 0;
191 return;
192 }
193
194 fdb_delete(br, f);
195}
196
197void br_fdb_find_delete_local(struct net_bridge *br,
198 const struct net_bridge_port *p,
199 const unsigned char *addr, u16 vid)
200{
201 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
202 struct net_bridge_fdb_entry *f;
203
204 spin_lock_bh(&br->hash_lock);
205 f = fdb_find(head, addr, vid);
206 if (f && f->is_local && !f->added_by_user && f->dst == p)
207 fdb_delete_local(br, p, f);
208 spin_unlock_bh(&br->hash_lock);
209}
210
211void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
212{
213 struct net_bridge_vlan_group *vg;
214 struct net_bridge *br = p->br;
215 struct net_bridge_vlan *v;
216 int i;
217
218 spin_lock_bh(&br->hash_lock);
219
220 vg = nbp_vlan_group(p);
221 /* Search all chains since old address/hash is unknown */
222 for (i = 0; i < BR_HASH_SIZE; i++) {
223 struct hlist_node *h;
224 hlist_for_each(h, &br->hash[i]) {
225 struct net_bridge_fdb_entry *f;
226
227 f = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
228 if (f->dst == p && f->is_local && !f->added_by_user) {
229 /* delete old one */
230 fdb_delete_local(br, p, f);
231
232 /* if this port has no vlan information
233 * configured, we can safely be done at
234 * this point.
235 */
236 if (!vg || !vg->num_vlans)
237 goto insert;
238 }
239 }
240 }
241
242insert:
243 /* insert new address, may fail if invalid address or dup. */
244 fdb_insert(br, p, newaddr, 0);
245
246 if (!vg || !vg->num_vlans)
247 goto done;
248
249 /* Now add entries for every VLAN configured on the port.
250 * This function runs under RTNL so the bitmap will not change
251 * from under us.
252 */
253 list_for_each_entry(v, &vg->vlan_list, vlist)
254 fdb_insert(br, p, newaddr, v->vid);
255
256done:
257 spin_unlock_bh(&br->hash_lock);
258}
259
260void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
261{
262 struct net_bridge_vlan_group *vg;
263 struct net_bridge_fdb_entry *f;
264 struct net_bridge_vlan *v;
265
266 spin_lock_bh(&br->hash_lock);
267
268 /* If old entry was unassociated with any port, then delete it. */
269 f = __br_fdb_get(br, br->dev->dev_addr, 0);
270 if (f && f->is_local && !f->dst)
271 fdb_delete_local(br, NULL, f);
272
273 fdb_insert(br, NULL, newaddr, 0);
274 vg = br_vlan_group(br);
275 if (!vg || !vg->num_vlans)
276 goto out;
277 /* Now remove and add entries for every VLAN configured on the
278 * bridge. This function runs under RTNL so the bitmap will not
279 * change from under us.
280 */
281 list_for_each_entry(v, &vg->vlan_list, vlist) {
282 f = __br_fdb_get(br, br->dev->dev_addr, v->vid);
283 if (f && f->is_local && !f->dst)
284 fdb_delete_local(br, NULL, f);
285 fdb_insert(br, NULL, newaddr, v->vid);
286 }
287out:
288 spin_unlock_bh(&br->hash_lock);
289}
290
291void br_fdb_cleanup(unsigned long _data)
292{
293 struct net_bridge *br = (struct net_bridge *)_data;
294 unsigned long delay = hold_time(br);
295 unsigned long next_timer = jiffies + br->ageing_time;
296 int i;
297
298 spin_lock(&br->hash_lock);
299 for (i = 0; i < BR_HASH_SIZE; i++) {
300 struct net_bridge_fdb_entry *f;
301 struct hlist_node *n;
302
303 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
304 unsigned long this_timer;
305 if (f->is_static)
306 continue;
307 if (f->added_by_external_learn)
308 continue;
309 this_timer = f->updated + delay;
310 if (time_before_eq(this_timer, jiffies))
311 fdb_delete(br, f);
312 else if (time_before(this_timer, next_timer))
313 next_timer = this_timer;
314 }
315 }
316 spin_unlock(&br->hash_lock);
317
318 mod_timer(&br->gc_timer, round_jiffies_up(next_timer));
319}
320
321/* Completely flush all dynamic entries in forwarding database.*/
322void br_fdb_flush(struct net_bridge *br)
323{
324 int i;
325
326 spin_lock_bh(&br->hash_lock);
327 for (i = 0; i < BR_HASH_SIZE; i++) {
328 struct net_bridge_fdb_entry *f;
329 struct hlist_node *n;
330 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
331 if (!f->is_static)
332 fdb_delete(br, f);
333 }
334 }
335 spin_unlock_bh(&br->hash_lock);
336}
337
338/* Flush all entries referring to a specific port.
339 * if do_all is set also flush static entries
340 * if vid is set delete all entries that match the vlan_id
341 */
342void br_fdb_delete_by_port(struct net_bridge *br,
343 const struct net_bridge_port *p,
344 u16 vid,
345 int do_all)
346{
347 int i;
348
349 spin_lock_bh(&br->hash_lock);
350 for (i = 0; i < BR_HASH_SIZE; i++) {
351 struct hlist_node *h, *g;
352
353 hlist_for_each_safe(h, g, &br->hash[i]) {
354 struct net_bridge_fdb_entry *f
355 = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
356 if (f->dst != p)
357 continue;
358
359 if (!do_all)
360 if (f->is_static || (vid && f->vlan_id != vid))
361 continue;
362
363 if (f->is_local)
364 fdb_delete_local(br, p, f);
365 else
366 fdb_delete(br, f);
367 }
368 }
369 spin_unlock_bh(&br->hash_lock);
370}
371
372/* No locking or refcounting, assumes caller has rcu_read_lock */
373struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
374 const unsigned char *addr,
375 __u16 vid)
376{
377 struct net_bridge_fdb_entry *fdb;
378
379 hlist_for_each_entry_rcu(fdb,
380 &br->hash[br_mac_hash(addr, vid)], hlist) {
381 if (ether_addr_equal(fdb->addr.addr, addr) &&
382 fdb->vlan_id == vid) {
383 if (unlikely(has_expired(br, fdb)))
384 break;
385 return fdb;
386 }
387 }
388
389 return NULL;
390}
391
392#if IS_ENABLED(CONFIG_ATM_LANE)
393/* Interface used by ATM LANE hook to test
394 * if an addr is on some other bridge port */
395int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
396{
397 struct net_bridge_fdb_entry *fdb;
398 struct net_bridge_port *port;
399 int ret;
400
401 rcu_read_lock();
402 port = br_port_get_rcu(dev);
403 if (!port)
404 ret = 0;
405 else {
406 fdb = __br_fdb_get(port->br, addr, 0);
407 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
408 fdb->dst->state == BR_STATE_FORWARDING;
409 }
410 rcu_read_unlock();
411
412 return ret;
413}
414#endif /* CONFIG_ATM_LANE */
415
416/*
417 * Fill buffer with forwarding table records in
418 * the API format.
419 */
420int br_fdb_fillbuf(struct net_bridge *br, void *buf,
421 unsigned long maxnum, unsigned long skip)
422{
423 struct __fdb_entry *fe = buf;
424 int i, num = 0;
425 struct net_bridge_fdb_entry *f;
426
427 memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
428
429 rcu_read_lock();
430 for (i = 0; i < BR_HASH_SIZE; i++) {
431 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
432 if (num >= maxnum)
433 goto out;
434
435 if (has_expired(br, f))
436 continue;
437
438 /* ignore pseudo entry for local MAC address */
439 if (!f->dst)
440 continue;
441
442 if (skip) {
443 --skip;
444 continue;
445 }
446
447 /* convert from internal format to API */
448 memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
449
450 /* due to ABI compat need to split into hi/lo */
451 fe->port_no = f->dst->port_no;
452 fe->port_hi = f->dst->port_no >> 8;
453
454 fe->is_local = f->is_local;
455 if (!f->is_static)
456 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
457 ++fe;
458 ++num;
459 }
460 }
461
462 out:
463 rcu_read_unlock();
464
465 return num;
466}
467
468static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
469 const unsigned char *addr,
470 __u16 vid)
471{
472 struct net_bridge_fdb_entry *fdb;
473
474 hlist_for_each_entry(fdb, head, hlist) {
475 if (ether_addr_equal(fdb->addr.addr, addr) &&
476 fdb->vlan_id == vid)
477 return fdb;
478 }
479 return NULL;
480}
481
482static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
483 const unsigned char *addr,
484 __u16 vid)
485{
486 struct net_bridge_fdb_entry *fdb;
487
488 hlist_for_each_entry_rcu(fdb, head, hlist) {
489 if (ether_addr_equal(fdb->addr.addr, addr) &&
490 fdb->vlan_id == vid)
491 return fdb;
492 }
493 return NULL;
494}
495
496static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
497 struct net_bridge_port *source,
498 const unsigned char *addr,
499 __u16 vid,
500 unsigned char is_local,
501 unsigned char is_static)
502{
503 struct net_bridge_fdb_entry *fdb;
504
505 fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
506 if (fdb) {
507 memcpy(fdb->addr.addr, addr, ETH_ALEN);
508 fdb->dst = source;
509 fdb->vlan_id = vid;
510 fdb->is_local = is_local;
511 fdb->is_static = is_static;
512 fdb->added_by_user = 0;
513 fdb->added_by_external_learn = 0;
514 fdb->updated = fdb->used = jiffies;
515 hlist_add_head_rcu(&fdb->hlist, head);
516 }
517 return fdb;
518}
519
520static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
521 const unsigned char *addr, u16 vid)
522{
523 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
524 struct net_bridge_fdb_entry *fdb;
525
526 if (!is_valid_ether_addr(addr))
527 return -EINVAL;
528
529 fdb = fdb_find(head, addr, vid);
530 if (fdb) {
531 /* it is okay to have multiple ports with same
532 * address, just use the first one.
533 */
534 if (fdb->is_local)
535 return 0;
536 br_warn(br, "adding interface %s with same address "
537 "as a received packet\n",
538 source ? source->dev->name : br->dev->name);
539 fdb_delete(br, fdb);
540 }
541
542 fdb = fdb_create(head, source, addr, vid, 1, 1);
543 if (!fdb)
544 return -ENOMEM;
545
546 fdb_add_hw_addr(br, addr);
547 fdb_notify(br, fdb, RTM_NEWNEIGH);
548 return 0;
549}
550
551/* Add entry for local address of interface */
552int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
553 const unsigned char *addr, u16 vid)
554{
555 int ret;
556
557 spin_lock_bh(&br->hash_lock);
558 ret = fdb_insert(br, source, addr, vid);
559 spin_unlock_bh(&br->hash_lock);
560 return ret;
561}
562
563void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
564 const unsigned char *addr, u16 vid, bool added_by_user)
565{
566 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
567 struct net_bridge_fdb_entry *fdb;
568 bool fdb_modified = false;
569
570 /* some users want to always flood. */
571 if (hold_time(br) == 0)
572 return;
573
574 /* ignore packets unless we are using this port */
575 if (!(source->state == BR_STATE_LEARNING ||
576 source->state == BR_STATE_FORWARDING))
577 return;
578
579 fdb = fdb_find_rcu(head, addr, vid);
580 if (likely(fdb)) {
581 /* attempt to update an entry for a local interface */
582 if (unlikely(fdb->is_local)) {
583 if (net_ratelimit())
584 br_warn(br, "received packet on %s with "
585 "own address as source address\n",
586 source->dev->name);
587 } else {
588 /* fastpath: update of existing entry */
589 if (unlikely(source != fdb->dst)) {
590 fdb->dst = source;
591 fdb_modified = true;
592 }
593 fdb->updated = jiffies;
594 if (unlikely(added_by_user))
595 fdb->added_by_user = 1;
596 if (unlikely(fdb_modified))
597 fdb_notify(br, fdb, RTM_NEWNEIGH);
598 }
599 } else {
600 spin_lock(&br->hash_lock);
601 if (likely(!fdb_find(head, addr, vid))) {
602 fdb = fdb_create(head, source, addr, vid, 0, 0);
603 if (fdb) {
604 if (unlikely(added_by_user))
605 fdb->added_by_user = 1;
606 fdb_notify(br, fdb, RTM_NEWNEIGH);
607 }
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 = fdb->added_by_external_learn ? NTF_EXT_LEARNED : 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 (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr))
652 goto nla_put_failure;
653 if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
654 goto nla_put_failure;
655 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
656 ci.ndm_confirmed = 0;
657 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
658 ci.ndm_refcnt = 0;
659 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
660 goto nla_put_failure;
661
662 if (fdb->vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id))
663 goto nla_put_failure;
664
665 nlmsg_end(skb, nlh);
666 return 0;
667
668nla_put_failure:
669 nlmsg_cancel(skb, nlh);
670 return -EMSGSIZE;
671}
672
673static inline size_t fdb_nlmsg_size(void)
674{
675 return NLMSG_ALIGN(sizeof(struct ndmsg))
676 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
677 + nla_total_size(sizeof(u32)) /* NDA_MASTER */
678 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
679 + nla_total_size(sizeof(struct nda_cacheinfo));
680}
681
682static void fdb_notify(struct net_bridge *br,
683 const struct net_bridge_fdb_entry *fdb, int type)
684{
685 struct net *net = dev_net(br->dev);
686 struct sk_buff *skb;
687 int err = -ENOBUFS;
688
689 skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
690 if (skb == NULL)
691 goto errout;
692
693 err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
694 if (err < 0) {
695 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
696 WARN_ON(err == -EMSGSIZE);
697 kfree_skb(skb);
698 goto errout;
699 }
700 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
701 return;
702errout:
703 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
704}
705
706/* Dump information about entries, in response to GETNEIGH */
707int br_fdb_dump(struct sk_buff *skb,
708 struct netlink_callback *cb,
709 struct net_device *dev,
710 struct net_device *filter_dev,
711 int idx)
712{
713 struct net_bridge *br = netdev_priv(dev);
714 int i;
715
716 if (!(dev->priv_flags & IFF_EBRIDGE))
717 goto out;
718
719 if (!filter_dev)
720 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
721
722 for (i = 0; i < BR_HASH_SIZE; i++) {
723 struct net_bridge_fdb_entry *f;
724
725 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
726 int err;
727
728 if (idx < cb->args[0])
729 goto skip;
730
731 if (filter_dev &&
732 (!f->dst || f->dst->dev != filter_dev)) {
733 if (filter_dev != dev)
734 goto skip;
735 /* !f->dst is a special case for bridge
736 * It means the MAC belongs to the bridge
737 * Therefore need a little more filtering
738 * we only want to dump the !f->dst case
739 */
740 if (f->dst)
741 goto skip;
742 }
743 if (!filter_dev && f->dst)
744 goto skip;
745
746 err = fdb_fill_info(skb, br, f,
747 NETLINK_CB(cb->skb).portid,
748 cb->nlh->nlmsg_seq,
749 RTM_NEWNEIGH,
750 NLM_F_MULTI);
751 if (err < 0) {
752 cb->args[1] = err;
753 break;
754 }
755skip:
756 ++idx;
757 }
758 }
759
760out:
761 return idx;
762}
763
764/* Update (create or replace) forwarding database entry */
765static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
766 __u16 state, __u16 flags, __u16 vid)
767{
768 struct net_bridge *br = source->br;
769 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
770 struct net_bridge_fdb_entry *fdb;
771 bool modified = false;
772
773 /* If the port cannot learn allow only local and static entries */
774 if (!(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
775 !(source->state == BR_STATE_LEARNING ||
776 source->state == BR_STATE_FORWARDING))
777 return -EPERM;
778
779 fdb = fdb_find(head, addr, vid);
780 if (fdb == NULL) {
781 if (!(flags & NLM_F_CREATE))
782 return -ENOENT;
783
784 fdb = fdb_create(head, source, addr, vid, 0, 0);
785 if (!fdb)
786 return -ENOMEM;
787
788 modified = true;
789 } else {
790 if (flags & NLM_F_EXCL)
791 return -EEXIST;
792
793 if (fdb->dst != source) {
794 fdb->dst = source;
795 modified = true;
796 }
797 }
798
799 if (fdb_to_nud(br, fdb) != state) {
800 if (state & NUD_PERMANENT) {
801 fdb->is_local = 1;
802 if (!fdb->is_static) {
803 fdb->is_static = 1;
804 fdb_add_hw_addr(br, addr);
805 }
806 } else if (state & NUD_NOARP) {
807 fdb->is_local = 0;
808 if (!fdb->is_static) {
809 fdb->is_static = 1;
810 fdb_add_hw_addr(br, addr);
811 }
812 } else {
813 fdb->is_local = 0;
814 if (fdb->is_static) {
815 fdb->is_static = 0;
816 fdb_del_hw_addr(br, addr);
817 }
818 }
819
820 modified = true;
821 }
822 fdb->added_by_user = 1;
823
824 fdb->used = jiffies;
825 if (modified) {
826 fdb->updated = jiffies;
827 fdb_notify(br, fdb, RTM_NEWNEIGH);
828 }
829
830 return 0;
831}
832
833static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p,
834 const unsigned char *addr, u16 nlh_flags, u16 vid)
835{
836 int err = 0;
837
838 if (ndm->ndm_flags & NTF_USE) {
839 local_bh_disable();
840 rcu_read_lock();
841 br_fdb_update(p->br, p, addr, vid, true);
842 rcu_read_unlock();
843 local_bh_enable();
844 } else {
845 spin_lock_bh(&p->br->hash_lock);
846 err = fdb_add_entry(p, addr, ndm->ndm_state,
847 nlh_flags, vid);
848 spin_unlock_bh(&p->br->hash_lock);
849 }
850
851 return err;
852}
853
854/* Add new permanent fdb entry with RTM_NEWNEIGH */
855int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
856 struct net_device *dev,
857 const unsigned char *addr, u16 vid, u16 nlh_flags)
858{
859 struct net_bridge_vlan_group *vg;
860 struct net_bridge_port *p = NULL;
861 struct net_bridge_vlan *v;
862 struct net_bridge *br = NULL;
863 int err = 0;
864
865 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
866 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
867 return -EINVAL;
868 }
869
870 if (is_zero_ether_addr(addr)) {
871 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
872 return -EINVAL;
873 }
874
875 if (dev->priv_flags & IFF_EBRIDGE) {
876 br = netdev_priv(dev);
877 vg = br_vlan_group(br);
878 } else {
879 p = br_port_get_rtnl(dev);
880 if (!p) {
881 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
882 dev->name);
883 return -EINVAL;
884 }
885 vg = nbp_vlan_group(p);
886 }
887
888 if (vid) {
889 v = br_vlan_find(vg, vid);
890 if (!v || !br_vlan_should_use(v)) {
891 pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
892 return -EINVAL;
893 }
894
895 /* VID was specified, so use it. */
896 if (dev->priv_flags & IFF_EBRIDGE)
897 err = br_fdb_insert(br, NULL, addr, vid);
898 else
899 err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
900 } else {
901 if (dev->priv_flags & IFF_EBRIDGE)
902 err = br_fdb_insert(br, NULL, addr, 0);
903 else
904 err = __br_fdb_add(ndm, p, addr, nlh_flags, 0);
905 if (err || !vg || !vg->num_vlans)
906 goto out;
907
908 /* We have vlans configured on this port and user didn't
909 * specify a VLAN. To be nice, add/update entry for every
910 * vlan on this port.
911 */
912 list_for_each_entry(v, &vg->vlan_list, vlist) {
913 if (!br_vlan_should_use(v))
914 continue;
915 if (dev->priv_flags & IFF_EBRIDGE)
916 err = br_fdb_insert(br, NULL, addr, v->vid);
917 else
918 err = __br_fdb_add(ndm, p, addr, nlh_flags,
919 v->vid);
920 if (err)
921 goto out;
922 }
923 }
924
925out:
926 return err;
927}
928
929static int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr,
930 u16 vid)
931{
932 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
933 struct net_bridge_fdb_entry *fdb;
934
935 fdb = fdb_find(head, addr, vid);
936 if (!fdb)
937 return -ENOENT;
938
939 fdb_delete(br, fdb);
940 return 0;
941}
942
943static int __br_fdb_delete_by_addr(struct net_bridge *br,
944 const unsigned char *addr, u16 vid)
945{
946 int err;
947
948 spin_lock_bh(&br->hash_lock);
949 err = fdb_delete_by_addr(br, addr, vid);
950 spin_unlock_bh(&br->hash_lock);
951
952 return err;
953}
954
955static int fdb_delete_by_addr_and_port(struct net_bridge_port *p,
956 const u8 *addr, u16 vlan)
957{
958 struct net_bridge *br = p->br;
959 struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)];
960 struct net_bridge_fdb_entry *fdb;
961
962 fdb = fdb_find(head, addr, vlan);
963 if (!fdb || fdb->dst != p)
964 return -ENOENT;
965
966 fdb_delete(br, fdb);
967 return 0;
968}
969
970static int __br_fdb_delete(struct net_bridge_port *p,
971 const unsigned char *addr, u16 vid)
972{
973 int err;
974
975 spin_lock_bh(&p->br->hash_lock);
976 err = fdb_delete_by_addr_and_port(p, addr, vid);
977 spin_unlock_bh(&p->br->hash_lock);
978
979 return err;
980}
981
982/* Remove neighbor entry with RTM_DELNEIGH */
983int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
984 struct net_device *dev,
985 const unsigned char *addr, u16 vid)
986{
987 struct net_bridge_vlan_group *vg;
988 struct net_bridge_port *p = NULL;
989 struct net_bridge_vlan *v;
990 struct net_bridge *br = NULL;
991 int err;
992
993 if (dev->priv_flags & IFF_EBRIDGE) {
994 br = netdev_priv(dev);
995 vg = br_vlan_group(br);
996 } else {
997 p = br_port_get_rtnl(dev);
998 if (!p) {
999 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
1000 dev->name);
1001 return -EINVAL;
1002 }
1003 vg = nbp_vlan_group(p);
1004 }
1005
1006 if (vid) {
1007 v = br_vlan_find(vg, vid);
1008 if (!v) {
1009 pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1010 return -EINVAL;
1011 }
1012
1013 if (dev->priv_flags & IFF_EBRIDGE)
1014 err = __br_fdb_delete_by_addr(br, addr, vid);
1015 else
1016 err = __br_fdb_delete(p, addr, vid);
1017 } else {
1018 err = -ENOENT;
1019 if (dev->priv_flags & IFF_EBRIDGE)
1020 err = __br_fdb_delete_by_addr(br, addr, 0);
1021 else
1022 err &= __br_fdb_delete(p, addr, 0);
1023
1024 if (!vg || !vg->num_vlans)
1025 goto out;
1026
1027 list_for_each_entry(v, &vg->vlan_list, vlist) {
1028 if (!br_vlan_should_use(v))
1029 continue;
1030 if (dev->priv_flags & IFF_EBRIDGE)
1031 err = __br_fdb_delete_by_addr(br, addr, v->vid);
1032 else
1033 err &= __br_fdb_delete(p, addr, v->vid);
1034 }
1035 }
1036out:
1037 return err;
1038}
1039
1040int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
1041{
1042 struct net_bridge_fdb_entry *fdb, *tmp;
1043 int i;
1044 int err;
1045
1046 ASSERT_RTNL();
1047
1048 for (i = 0; i < BR_HASH_SIZE; i++) {
1049 hlist_for_each_entry(fdb, &br->hash[i], hlist) {
1050 /* We only care for static entries */
1051 if (!fdb->is_static)
1052 continue;
1053
1054 err = dev_uc_add(p->dev, fdb->addr.addr);
1055 if (err)
1056 goto rollback;
1057 }
1058 }
1059 return 0;
1060
1061rollback:
1062 for (i = 0; i < BR_HASH_SIZE; i++) {
1063 hlist_for_each_entry(tmp, &br->hash[i], hlist) {
1064 /* If we reached the fdb that failed, we can stop */
1065 if (tmp == fdb)
1066 break;
1067
1068 /* We only care for static entries */
1069 if (!tmp->is_static)
1070 continue;
1071
1072 dev_uc_del(p->dev, tmp->addr.addr);
1073 }
1074 }
1075 return err;
1076}
1077
1078void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
1079{
1080 struct net_bridge_fdb_entry *fdb;
1081 int i;
1082
1083 ASSERT_RTNL();
1084
1085 for (i = 0; i < BR_HASH_SIZE; i++) {
1086 hlist_for_each_entry_rcu(fdb, &br->hash[i], hlist) {
1087 /* We only care for static entries */
1088 if (!fdb->is_static)
1089 continue;
1090
1091 dev_uc_del(p->dev, fdb->addr.addr);
1092 }
1093 }
1094}
1095
1096int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
1097 const unsigned char *addr, u16 vid)
1098{
1099 struct hlist_head *head;
1100 struct net_bridge_fdb_entry *fdb;
1101 int err = 0;
1102
1103 ASSERT_RTNL();
1104 spin_lock_bh(&br->hash_lock);
1105
1106 head = &br->hash[br_mac_hash(addr, vid)];
1107 fdb = fdb_find(head, addr, vid);
1108 if (!fdb) {
1109 fdb = fdb_create(head, p, addr, vid, 0, 0);
1110 if (!fdb) {
1111 err = -ENOMEM;
1112 goto err_unlock;
1113 }
1114 fdb->added_by_external_learn = 1;
1115 fdb_notify(br, fdb, RTM_NEWNEIGH);
1116 } else if (fdb->added_by_external_learn) {
1117 /* Refresh entry */
1118 fdb->updated = fdb->used = jiffies;
1119 } else if (!fdb->added_by_user) {
1120 /* Take over SW learned entry */
1121 fdb->added_by_external_learn = 1;
1122 fdb->updated = jiffies;
1123 fdb_notify(br, fdb, RTM_NEWNEIGH);
1124 }
1125
1126err_unlock:
1127 spin_unlock_bh(&br->hash_lock);
1128
1129 return err;
1130}
1131
1132int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
1133 const unsigned char *addr, u16 vid)
1134{
1135 struct hlist_head *head;
1136 struct net_bridge_fdb_entry *fdb;
1137 int err = 0;
1138
1139 ASSERT_RTNL();
1140 spin_lock_bh(&br->hash_lock);
1141
1142 head = &br->hash[br_mac_hash(addr, vid)];
1143 fdb = fdb_find(head, addr, vid);
1144 if (fdb && fdb->added_by_external_learn)
1145 fdb_delete(br, fdb);
1146 else
1147 err = -ENOENT;
1148
1149 spin_unlock_bh(&br->hash_lock);
1150
1151 return err;
1152}