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