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
27 static 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
34 static struct kmem_cache *br_fdb_cache __read_mostly;
35 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
36 const unsigned char *addr, u16 vid);
37 static void fdb_notify(struct net_bridge *br,
38 const struct net_bridge_fdb_entry *, int, bool);
39
br_fdb_init(void)40 int __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
br_fdb_fini(void)52 void br_fdb_fini(void)
53 {
54 kmem_cache_destroy(br_fdb_cache);
55 }
56
br_fdb_hash_init(struct net_bridge * br)57 int br_fdb_hash_init(struct net_bridge *br)
58 {
59 return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params);
60 }
61
br_fdb_hash_fini(struct net_bridge * br)62 void 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 */
hold_time(const struct net_bridge * br)70 static inline unsigned long hold_time(const struct net_bridge *br)
71 {
72 return br->topology_change ? br->forward_delay : br->ageing_time;
73 }
74
has_expired(const struct net_bridge * br,const struct net_bridge_fdb_entry * fdb)75 static 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
fdb_rcu_free(struct rcu_head * head)83 static 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
fdb_find_rcu(struct rhashtable * tbl,const unsigned char * addr,__u16 vid)90 static 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 */
br_fdb_find(struct net_bridge * br,const unsigned char * addr,__u16 vid)105 static 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
br_fdb_find_port(const struct net_device * br_dev,const unsigned char * addr,__u16 vid)120 struct 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 }
142 EXPORT_SYMBOL_GPL(br_fdb_find_port);
143
br_fdb_find_rcu(struct net_bridge * br,const unsigned char * addr,__u16 vid)144 struct 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 */
fdb_add_hw_addr(struct net_bridge * br,const unsigned char * addr)156 static 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;
172 undo:
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 */
fdb_del_hw_addr(struct net_bridge * br,const unsigned char * addr)184 static 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
fdb_delete(struct net_bridge * br,struct net_bridge_fdb_entry * f,bool swdev_notify)196 static 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. */
fdb_delete_local(struct net_bridge * br,const struct net_bridge_port * p,struct net_bridge_fdb_entry * f)212 static 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
br_fdb_find_delete_local(struct net_bridge * br,const struct net_bridge_port * p,const unsigned char * addr,u16 vid)246 void 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
br_fdb_changeaddr(struct net_bridge_port * p,const unsigned char * newaddr)260 void 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
284 insert:
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
298 done:
299 spin_unlock_bh(&br->hash_lock);
300 }
301
br_fdb_change_mac_address(struct net_bridge * br,const u8 * newaddr)302 void 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 }
333 out:
334 spin_unlock_bh(&br->hash_lock);
335 }
336
br_fdb_cleanup(struct work_struct * work)337 void 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.*/
br_fdb_flush(struct net_bridge * br)384 void 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 */
br_fdb_delete_by_port(struct net_bridge * br,const struct net_bridge_port * p,u16 vid,int do_all)401 void 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 */
br_fdb_test_addr(struct net_device * dev,unsigned char * addr)432 int 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 */
br_fdb_fillbuf(struct net_bridge * br,void * buf,unsigned long maxnum,unsigned long skip)457 int 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
fdb_create(struct net_bridge * br,struct net_bridge_port * source,const unsigned char * addr,__u16 vid,unsigned long flags)501 static 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
fdb_insert(struct net_bridge * br,struct net_bridge_port * source,const unsigned char * addr,u16 vid)528 static 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 */
br_fdb_insert(struct net_bridge * br,struct net_bridge_port * source,const unsigned char * addr,u16 vid)559 int 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 */
__fdb_mark_active(struct net_bridge_fdb_entry * fdb)571 static 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
br_fdb_update(struct net_bridge * br,struct net_bridge_port * source,const unsigned char * addr,u16 vid,unsigned long flags)577 void 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
fdb_to_nud(const struct net_bridge * br,const struct net_bridge_fdb_entry * fdb)635 static 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
fdb_fill_info(struct sk_buff * skb,const struct net_bridge * br,const struct net_bridge_fdb_entry * fdb,u32 portid,u32 seq,int type,unsigned int flags)648 static 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
712 nla_put_failure:
713 nlmsg_cancel(skb, nlh);
714 return -EMSGSIZE;
715 }
716
fdb_nlmsg_size(void)717 static 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
fdb_notify(struct net_bridge * br,const struct net_bridge_fdb_entry * fdb,int type,bool swdev_notify)728 static 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;
752 errout:
753 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
754 }
755
756 /* Dump information about entries, in response to GETNEIGH */
br_fdb_dump(struct sk_buff * skb,struct netlink_callback * cb,struct net_device * dev,struct net_device * filter_dev,int * idx)757 int 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;
801 skip:
802 *idx += 1;
803 }
804 rcu_read_unlock();
805
806 return err;
807 }
808
br_fdb_get(struct sk_buff * skb,struct nlattr * tb[],struct net_device * dev,const unsigned char * addr,u16 vid,u32 portid,u32 seq,struct netlink_ext_ack * extack)809 int 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);
830 errout:
831 rcu_read_unlock();
832 return err;
833 }
834
835 /* returns true if the fdb is modified */
fdb_handle_notify(struct net_bridge_fdb_entry * fdb,u8 notify)836 static 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 */
fdb_add_entry(struct net_bridge * br,struct net_bridge_port * source,const u8 * addr,struct ndmsg * ndm,u16 flags,u16 vid,struct nlattr * nfea_tb[])860 static 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
__br_fdb_add(struct ndmsg * ndm,struct net_bridge * br,struct net_bridge_port * p,const unsigned char * addr,u16 nlh_flags,u16 vid,struct nlattr * nfea_tb[],struct netlink_ext_ack * extack)951 static 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 struct netlink_ext_ack *extack)
955 {
956 int err = 0;
957
958 if (ndm->ndm_flags & NTF_USE) {
959 if (!p) {
960 pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n",
961 br->dev->name);
962 return -EINVAL;
963 }
964 if (!nbp_state_should_learn(p))
965 return 0;
966
967 local_bh_disable();
968 rcu_read_lock();
969 br_fdb_update(br, p, addr, vid, BIT(BR_FDB_ADDED_BY_USER));
970 rcu_read_unlock();
971 local_bh_enable();
972 } else if (ndm->ndm_flags & NTF_EXT_LEARNED) {
973 if (!p && !(ndm->ndm_state & NUD_PERMANENT)) {
974 NL_SET_ERR_MSG_MOD(extack,
975 "FDB entry towards bridge must be permanent");
976 return -EINVAL;
977 }
978 err = br_fdb_external_learn_add(br, p, addr, vid, true);
979 } else {
980 spin_lock_bh(&br->hash_lock);
981 err = fdb_add_entry(br, p, addr, ndm, nlh_flags, vid, nfea_tb);
982 spin_unlock_bh(&br->hash_lock);
983 }
984
985 return err;
986 }
987
988 static const struct nla_policy br_nda_fdb_pol[NFEA_MAX + 1] = {
989 [NFEA_ACTIVITY_NOTIFY] = { .type = NLA_U8 },
990 [NFEA_DONT_REFRESH] = { .type = NLA_FLAG },
991 };
992
993 /* Add new permanent fdb entry with RTM_NEWNEIGH */
br_fdb_add(struct ndmsg * ndm,struct nlattr * tb[],struct net_device * dev,const unsigned char * addr,u16 vid,u16 nlh_flags,struct netlink_ext_ack * extack)994 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
995 struct net_device *dev,
996 const unsigned char *addr, u16 vid, u16 nlh_flags,
997 struct netlink_ext_ack *extack)
998 {
999 struct nlattr *nfea_tb[NFEA_MAX + 1], *attr;
1000 struct net_bridge_vlan_group *vg;
1001 struct net_bridge_port *p = NULL;
1002 struct net_bridge_vlan *v;
1003 struct net_bridge *br = NULL;
1004 int err = 0;
1005
1006 trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags);
1007
1008 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
1009 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
1010 return -EINVAL;
1011 }
1012
1013 if (is_zero_ether_addr(addr)) {
1014 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
1015 return -EINVAL;
1016 }
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_NEWNEIGH %s not a bridge port\n",
1025 dev->name);
1026 return -EINVAL;
1027 }
1028 br = p->br;
1029 vg = nbp_vlan_group(p);
1030 }
1031
1032 if (tb[NDA_FDB_EXT_ATTRS]) {
1033 attr = tb[NDA_FDB_EXT_ATTRS];
1034 err = nla_parse_nested(nfea_tb, NFEA_MAX, attr,
1035 br_nda_fdb_pol, extack);
1036 if (err)
1037 return err;
1038 } else {
1039 memset(nfea_tb, 0, sizeof(struct nlattr *) * (NFEA_MAX + 1));
1040 }
1041
1042 if (vid) {
1043 v = br_vlan_find(vg, vid);
1044 if (!v || !br_vlan_should_use(v)) {
1045 pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1046 return -EINVAL;
1047 }
1048
1049 /* VID was specified, so use it. */
1050 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid, nfea_tb,
1051 extack);
1052 } else {
1053 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0, nfea_tb,
1054 extack);
1055 if (err || !vg || !vg->num_vlans)
1056 goto out;
1057
1058 /* We have vlans configured on this port and user didn't
1059 * specify a VLAN. To be nice, add/update entry for every
1060 * vlan on this port.
1061 */
1062 list_for_each_entry(v, &vg->vlan_list, vlist) {
1063 if (!br_vlan_should_use(v))
1064 continue;
1065 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid,
1066 nfea_tb, extack);
1067 if (err)
1068 goto out;
1069 }
1070 }
1071
1072 out:
1073 return err;
1074 }
1075
fdb_delete_by_addr_and_port(struct net_bridge * br,const struct net_bridge_port * p,const u8 * addr,u16 vlan)1076 static int fdb_delete_by_addr_and_port(struct net_bridge *br,
1077 const struct net_bridge_port *p,
1078 const u8 *addr, u16 vlan)
1079 {
1080 struct net_bridge_fdb_entry *fdb;
1081
1082 fdb = br_fdb_find(br, addr, vlan);
1083 if (!fdb || fdb->dst != p)
1084 return -ENOENT;
1085
1086 fdb_delete(br, fdb, true);
1087
1088 return 0;
1089 }
1090
__br_fdb_delete(struct net_bridge * br,const struct net_bridge_port * p,const unsigned char * addr,u16 vid)1091 static int __br_fdb_delete(struct net_bridge *br,
1092 const struct net_bridge_port *p,
1093 const unsigned char *addr, u16 vid)
1094 {
1095 int err;
1096
1097 spin_lock_bh(&br->hash_lock);
1098 err = fdb_delete_by_addr_and_port(br, p, addr, vid);
1099 spin_unlock_bh(&br->hash_lock);
1100
1101 return err;
1102 }
1103
1104 /* Remove neighbor entry with RTM_DELNEIGH */
br_fdb_delete(struct ndmsg * ndm,struct nlattr * tb[],struct net_device * dev,const unsigned char * addr,u16 vid)1105 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1106 struct net_device *dev,
1107 const unsigned char *addr, u16 vid)
1108 {
1109 struct net_bridge_vlan_group *vg;
1110 struct net_bridge_port *p = NULL;
1111 struct net_bridge_vlan *v;
1112 struct net_bridge *br;
1113 int err;
1114
1115 if (dev->priv_flags & IFF_EBRIDGE) {
1116 br = netdev_priv(dev);
1117 vg = br_vlan_group(br);
1118 } else {
1119 p = br_port_get_rtnl(dev);
1120 if (!p) {
1121 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
1122 dev->name);
1123 return -EINVAL;
1124 }
1125 vg = nbp_vlan_group(p);
1126 br = p->br;
1127 }
1128
1129 if (vid) {
1130 v = br_vlan_find(vg, vid);
1131 if (!v) {
1132 pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1133 return -EINVAL;
1134 }
1135
1136 err = __br_fdb_delete(br, p, addr, vid);
1137 } else {
1138 err = -ENOENT;
1139 err &= __br_fdb_delete(br, p, addr, 0);
1140 if (!vg || !vg->num_vlans)
1141 return err;
1142
1143 list_for_each_entry(v, &vg->vlan_list, vlist) {
1144 if (!br_vlan_should_use(v))
1145 continue;
1146 err &= __br_fdb_delete(br, p, addr, v->vid);
1147 }
1148 }
1149
1150 return err;
1151 }
1152
br_fdb_sync_static(struct net_bridge * br,struct net_bridge_port * p)1153 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
1154 {
1155 struct net_bridge_fdb_entry *f, *tmp;
1156 int err = 0;
1157
1158 ASSERT_RTNL();
1159
1160 /* the key here is that static entries change only under rtnl */
1161 rcu_read_lock();
1162 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1163 /* We only care for static entries */
1164 if (!test_bit(BR_FDB_STATIC, &f->flags))
1165 continue;
1166 err = dev_uc_add(p->dev, f->key.addr.addr);
1167 if (err)
1168 goto rollback;
1169 }
1170 done:
1171 rcu_read_unlock();
1172
1173 return err;
1174
1175 rollback:
1176 hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) {
1177 /* We only care for static entries */
1178 if (!test_bit(BR_FDB_STATIC, &tmp->flags))
1179 continue;
1180 if (tmp == f)
1181 break;
1182 dev_uc_del(p->dev, tmp->key.addr.addr);
1183 }
1184
1185 goto done;
1186 }
1187
br_fdb_unsync_static(struct net_bridge * br,struct net_bridge_port * p)1188 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
1189 {
1190 struct net_bridge_fdb_entry *f;
1191
1192 ASSERT_RTNL();
1193
1194 rcu_read_lock();
1195 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1196 /* We only care for static entries */
1197 if (!test_bit(BR_FDB_STATIC, &f->flags))
1198 continue;
1199
1200 dev_uc_del(p->dev, f->key.addr.addr);
1201 }
1202 rcu_read_unlock();
1203 }
1204
br_fdb_external_learn_add(struct net_bridge * br,struct net_bridge_port * p,const unsigned char * addr,u16 vid,bool swdev_notify)1205 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
1206 const unsigned char *addr, u16 vid,
1207 bool swdev_notify)
1208 {
1209 struct net_bridge_fdb_entry *fdb;
1210 bool modified = false;
1211 int err = 0;
1212
1213 trace_br_fdb_external_learn_add(br, p, addr, vid);
1214
1215 spin_lock_bh(&br->hash_lock);
1216
1217 fdb = br_fdb_find(br, addr, vid);
1218 if (!fdb) {
1219 unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN);
1220
1221 if (swdev_notify)
1222 flags |= BIT(BR_FDB_ADDED_BY_USER);
1223
1224 if (!p)
1225 flags |= BIT(BR_FDB_LOCAL);
1226
1227 fdb = fdb_create(br, p, addr, vid, flags);
1228 if (!fdb) {
1229 err = -ENOMEM;
1230 goto err_unlock;
1231 }
1232 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1233 } else {
1234 fdb->updated = jiffies;
1235
1236 if (fdb->dst != p) {
1237 fdb->dst = p;
1238 modified = true;
1239 }
1240
1241 if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) {
1242 /* Refresh entry */
1243 fdb->used = jiffies;
1244 } else if (!test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags)) {
1245 /* Take over SW learned entry */
1246 set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags);
1247 modified = true;
1248 }
1249
1250 if (swdev_notify)
1251 set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
1252
1253 if (!p)
1254 set_bit(BR_FDB_LOCAL, &fdb->flags);
1255
1256 if (modified)
1257 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1258 }
1259
1260 err_unlock:
1261 spin_unlock_bh(&br->hash_lock);
1262
1263 return err;
1264 }
1265
br_fdb_external_learn_del(struct net_bridge * br,struct net_bridge_port * p,const unsigned char * addr,u16 vid,bool swdev_notify)1266 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
1267 const unsigned char *addr, u16 vid,
1268 bool swdev_notify)
1269 {
1270 struct net_bridge_fdb_entry *fdb;
1271 int err = 0;
1272
1273 spin_lock_bh(&br->hash_lock);
1274
1275 fdb = br_fdb_find(br, addr, vid);
1276 if (fdb && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
1277 fdb_delete(br, fdb, swdev_notify);
1278 else
1279 err = -ENOENT;
1280
1281 spin_unlock_bh(&br->hash_lock);
1282
1283 return err;
1284 }
1285
br_fdb_offloaded_set(struct net_bridge * br,struct net_bridge_port * p,const unsigned char * addr,u16 vid,bool offloaded)1286 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
1287 const unsigned char *addr, u16 vid, bool offloaded)
1288 {
1289 struct net_bridge_fdb_entry *fdb;
1290
1291 spin_lock_bh(&br->hash_lock);
1292
1293 fdb = br_fdb_find(br, addr, vid);
1294 if (fdb && offloaded != test_bit(BR_FDB_OFFLOADED, &fdb->flags))
1295 change_bit(BR_FDB_OFFLOADED, &fdb->flags);
1296
1297 spin_unlock_bh(&br->hash_lock);
1298 }
1299
br_fdb_clear_offload(const struct net_device * dev,u16 vid)1300 void br_fdb_clear_offload(const struct net_device *dev, u16 vid)
1301 {
1302 struct net_bridge_fdb_entry *f;
1303 struct net_bridge_port *p;
1304
1305 ASSERT_RTNL();
1306
1307 p = br_port_get_rtnl(dev);
1308 if (!p)
1309 return;
1310
1311 spin_lock_bh(&p->br->hash_lock);
1312 hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) {
1313 if (f->dst == p && f->key.vlan_id == vid)
1314 clear_bit(BR_FDB_OFFLOADED, &f->flags);
1315 }
1316 spin_unlock_bh(&p->br->hash_lock);
1317 }
1318 EXPORT_SYMBOL_GPL(br_fdb_clear_offload);
1319