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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// 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);