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of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / net / bridge / br_fdb.c
bloba642bb829d09cfd473d5ad17a64b2ba6b76d912e
1 /*
2 * Forwarding database
3 * Linux ethernet bridge
4 *
5 * Authors:
6 * Lennert Buytenhek <buytenh@gnu.org>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/rculist.h>
17 #include <linux/spinlock.h>
18 #include <linux/times.h>
19 #include <linux/netdevice.h>
20 #include <linux/etherdevice.h>
21 #include <linux/jhash.h>
22 #include <linux/random.h>
23 #include <linux/slab.h>
24 #include <linux/atomic.h>
25 #include <asm/unaligned.h>
26 #include <linux/if_vlan.h>
27 #include <net/switchdev.h>
28 #include "br_private.h"
29
30 static struct kmem_cache *br_fdb_cache __read_mostly;
31 static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
32 const unsigned char *addr,
33 __u16 vid);
34 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
35 const unsigned char *addr, u16 vid);
36 static void fdb_notify(struct net_bridge *br,
37 const struct net_bridge_fdb_entry *, int);
38
39 static u32 fdb_salt __read_mostly;
40
41 int __init br_fdb_init(void)
42 {
43 br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
44 sizeof(struct net_bridge_fdb_entry),
45 0,
46 SLAB_HWCACHE_ALIGN, NULL);
47 if (!br_fdb_cache)
48 return -ENOMEM;
49
50 get_random_bytes(&fdb_salt, sizeof(fdb_salt));
51 return 0;
52 }
53
54 void br_fdb_fini(void)
55 {
56 kmem_cache_destroy(br_fdb_cache);
57 }
58
59
60 /* if topology_changing then use forward_delay (default 15 sec)
61 * otherwise keep longer (default 5 minutes)
62 */
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 !fdb->is_static &&
72 time_before_eq(fdb->updated + hold_time(br), jiffies);
73 }
74
75 static inline int br_mac_hash(const unsigned char *mac, __u16 vid)
76 {
77 /* use 1 byte of OUI and 3 bytes of NIC */
78 u32 key = get_unaligned((u32 *)(mac + 2));
79 return jhash_2words(key, vid, fdb_salt) & (BR_HASH_SIZE - 1);
80 }
81
82 static void fdb_rcu_free(struct rcu_head *head)
83 {
84 struct net_bridge_fdb_entry *ent
85 = container_of(head, struct net_bridge_fdb_entry, rcu);
86 kmem_cache_free(br_fdb_cache, ent);
87 }
88
89 /* When a static FDB entry is added, the mac address from the entry is
90 * added to the bridge private HW address list and all required ports
91 * are then updated with the new information.
92 * Called under RTNL.
93 */
94 static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr)
95 {
96 int err;
97 struct net_bridge_port *p;
98
99 ASSERT_RTNL();
100
101 list_for_each_entry(p, &br->port_list, list) {
102 if (!br_promisc_port(p)) {
103 err = dev_uc_add(p->dev, addr);
104 if (err)
105 goto undo;
106 }
107 }
108
109 return;
110 undo:
111 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
112 if (!br_promisc_port(p))
113 dev_uc_del(p->dev, addr);
114 }
115 }
116
117 /* When a static FDB entry is deleted, the HW address from that entry is
118 * also removed from the bridge private HW address list and updates all
119 * the ports with needed information.
120 * Called under RTNL.
121 */
122 static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
123 {
124 struct net_bridge_port *p;
125
126 ASSERT_RTNL();
127
128 list_for_each_entry(p, &br->port_list, list) {
129 if (!br_promisc_port(p))
130 dev_uc_del(p->dev, addr);
131 }
132 }
133
134 static void fdb_del_external_learn(struct net_bridge_fdb_entry *f)
135 {
136 struct switchdev_obj_port_fdb fdb = {
137 .obj = {
138 .id = SWITCHDEV_OBJ_ID_PORT_FDB,
139 .flags = SWITCHDEV_F_DEFER,
140 },
141 .vid = f->vlan_id,
142 };
143
144 ether_addr_copy(fdb.addr, f->addr.addr);
145 switchdev_port_obj_del(f->dst->dev, &fdb.obj);
146 }
147
148 static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
149 {
150 if (f->is_static)
151 fdb_del_hw_addr(br, f->addr.addr);
152
153 if (f->added_by_external_learn)
154 fdb_del_external_learn(f);
155
156 hlist_del_rcu(&f->hlist);
157 fdb_notify(br, f, RTM_DELNEIGH);
158 call_rcu(&f->rcu, fdb_rcu_free);
159 }
160
161 /* Delete a local entry if no other port had the same address. */
162 static void fdb_delete_local(struct net_bridge *br,
163 const struct net_bridge_port *p,
164 struct net_bridge_fdb_entry *f)
165 {
166 const unsigned char *addr = f->addr.addr;
167 struct net_bridge_vlan_group *vg;
168 const struct net_bridge_vlan *v;
169 struct net_bridge_port *op;
170 u16 vid = f->vlan_id;
171
172 /* Maybe another port has same hw addr? */
173 list_for_each_entry(op, &br->port_list, list) {
174 vg = nbp_vlan_group(op);
175 if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
176 (!vid || br_vlan_find(vg, vid))) {
177 f->dst = op;
178 f->added_by_user = 0;
179 return;
180 }
181 }
182
183 vg = br_vlan_group(br);
184 v = br_vlan_find(vg, vid);
185 /* Maybe bridge device has same hw addr? */
186 if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
187 (!vid || (v && br_vlan_should_use(v)))) {
188 f->dst = NULL;
189 f->added_by_user = 0;
190 return;
191 }
192
193 fdb_delete(br, f);
194 }
195
196 void br_fdb_find_delete_local(struct net_bridge *br,
197 const struct net_bridge_port *p,
198 const unsigned char *addr, u16 vid)
199 {
200 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
201 struct net_bridge_fdb_entry *f;
202
203 spin_lock_bh(&br->hash_lock);
204 f = fdb_find(head, addr, vid);
205 if (f && f->is_local && !f->added_by_user && f->dst == p)
206 fdb_delete_local(br, p, f);
207 spin_unlock_bh(&br->hash_lock);
208 }
209
210 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
211 {
212 struct net_bridge_vlan_group *vg;
213 struct net_bridge *br = p->br;
214 struct net_bridge_vlan *v;
215 int i;
216
217 spin_lock_bh(&br->hash_lock);
218
219 vg = nbp_vlan_group(p);
220 /* Search all chains since old address/hash is unknown */
221 for (i = 0; i < BR_HASH_SIZE; i++) {
222 struct hlist_node *h;
223 hlist_for_each(h, &br->hash[i]) {
224 struct net_bridge_fdb_entry *f;
225
226 f = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
227 if (f->dst == p && f->is_local && !f->added_by_user) {
228 /* delete old one */
229 fdb_delete_local(br, p, f);
230
231 /* if this port has no vlan information
232 * configured, we can safely be done at
233 * this point.
234 */
235 if (!vg || !vg->num_vlans)
236 goto insert;
237 }
238 }
239 }
240
241 insert:
242 /* insert new address, may fail if invalid address or dup. */
243 fdb_insert(br, p, newaddr, 0);
244
245 if (!vg || !vg->num_vlans)
246 goto done;
247
248 /* Now add entries for every VLAN configured on the port.
249 * This function runs under RTNL so the bitmap will not change
250 * from under us.
251 */
252 list_for_each_entry(v, &vg->vlan_list, vlist)
253 fdb_insert(br, p, newaddr, v->vid);
254
255 done:
256 spin_unlock_bh(&br->hash_lock);
257 }
258
259 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
260 {
261 struct net_bridge_vlan_group *vg;
262 struct net_bridge_fdb_entry *f;
263 struct net_bridge_vlan *v;
264
265 spin_lock_bh(&br->hash_lock);
266
267 /* If old entry was unassociated with any port, then delete it. */
268 f = __br_fdb_get(br, br->dev->dev_addr, 0);
269 if (f && f->is_local && !f->dst)
270 fdb_delete_local(br, NULL, f);
271
272 fdb_insert(br, NULL, newaddr, 0);
273 vg = br_vlan_group(br);
274 if (!vg || !vg->num_vlans)
275 goto out;
276 /* Now remove and add entries for every VLAN configured on the
277 * bridge. This function runs under RTNL so the bitmap will not
278 * change from under us.
279 */
280 list_for_each_entry(v, &vg->vlan_list, vlist) {
281 f = __br_fdb_get(br, br->dev->dev_addr, v->vid);
282 if (f && f->is_local && !f->dst)
283 fdb_delete_local(br, NULL, f);
284 fdb_insert(br, NULL, newaddr, v->vid);
285 }
286 out:
287 spin_unlock_bh(&br->hash_lock);
288 }
289
290 void br_fdb_cleanup(unsigned long _data)
291 {
292 struct net_bridge *br = (struct net_bridge *)_data;
293 unsigned long delay = hold_time(br);
294 unsigned long next_timer = jiffies + br->ageing_time;
295 int i;
296
297 spin_lock(&br->hash_lock);
298 for (i = 0; i < BR_HASH_SIZE; i++) {
299 struct net_bridge_fdb_entry *f;
300 struct hlist_node *n;
301
302 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
303 unsigned long this_timer;
304 if (f->is_static)
305 continue;
306 if (f->added_by_external_learn)
307 continue;
308 this_timer = f->updated + delay;
309 if (time_before_eq(this_timer, jiffies))
310 fdb_delete(br, f);
311 else if (time_before(this_timer, next_timer))
312 next_timer = this_timer;
313 }
314 }
315 spin_unlock(&br->hash_lock);
316
317 mod_timer(&br->gc_timer, round_jiffies_up(next_timer));
318 }
319
320 /* Completely flush all dynamic entries in forwarding database.*/
321 void br_fdb_flush(struct net_bridge *br)
322 {
323 int i;
324
325 spin_lock_bh(&br->hash_lock);
326 for (i = 0; i < BR_HASH_SIZE; i++) {
327 struct net_bridge_fdb_entry *f;
328 struct hlist_node *n;
329 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
330 if (!f->is_static)
331 fdb_delete(br, f);
332 }
333 }
334 spin_unlock_bh(&br->hash_lock);
335 }
336
337 /* Flush all entries referring to a specific port.
338 * if do_all is set also flush static entries
339 * if vid is set delete all entries that match the vlan_id
340 */
341 void br_fdb_delete_by_port(struct net_bridge *br,
342 const struct net_bridge_port *p,
343 u16 vid,
344 int do_all)
345 {
346 int i;
347
348 spin_lock_bh(&br->hash_lock);
349 for (i = 0; i < BR_HASH_SIZE; i++) {
350 struct hlist_node *h, *g;
351
352 hlist_for_each_safe(h, g, &br->hash[i]) {
353 struct net_bridge_fdb_entry *f
354 = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
355 if (f->dst != p)
356 continue;
357
358 if (!do_all)
359 if (f->is_static || (vid && f->vlan_id != vid))
360 continue;
361
362 if (f->is_local)
363 fdb_delete_local(br, p, f);
364 else
365 fdb_delete(br, f);
366 }
367 }
368 spin_unlock_bh(&br->hash_lock);
369 }
370
371 /* No locking or refcounting, assumes caller has rcu_read_lock */
372 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
373 const unsigned char *addr,
374 __u16 vid)
375 {
376 struct net_bridge_fdb_entry *fdb;
377
378 hlist_for_each_entry_rcu(fdb,
379 &br->hash[br_mac_hash(addr, vid)], hlist) {
380 if (ether_addr_equal(fdb->addr.addr, addr) &&
381 fdb->vlan_id == vid) {
382 if (unlikely(has_expired(br, fdb)))
383 break;
384 return fdb;
385 }
386 }
387
388 return NULL;
389 }
390
391 #if IS_ENABLED(CONFIG_ATM_LANE)
392 /* Interface used by ATM LANE hook to test
393 * if an addr is on some other bridge port */
394 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
395 {
396 struct net_bridge_fdb_entry *fdb;
397 struct net_bridge_port *port;
398 int ret;
399
400 rcu_read_lock();
401 port = br_port_get_rcu(dev);
402 if (!port)
403 ret = 0;
404 else {
405 fdb = __br_fdb_get(port->br, addr, 0);
406 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
407 fdb->dst->state == BR_STATE_FORWARDING;
408 }
409 rcu_read_unlock();
410
411 return ret;
412 }
413 #endif /* CONFIG_ATM_LANE */
414
415 /*
416 * Fill buffer with forwarding table records in
417 * the API format.
418 */
419 int br_fdb_fillbuf(struct net_bridge *br, void *buf,
420 unsigned long maxnum, unsigned long skip)
421 {
422 struct __fdb_entry *fe = buf;
423 int i, num = 0;
424 struct net_bridge_fdb_entry *f;
425
426 memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
427
428 rcu_read_lock();
429 for (i = 0; i < BR_HASH_SIZE; i++) {
430 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
431 if (num >= maxnum)
432 goto out;
433
434 if (has_expired(br, f))
435 continue;
436
437 /* ignore pseudo entry for local MAC address */
438 if (!f->dst)
439 continue;
440
441 if (skip) {
442 --skip;
443 continue;
444 }
445
446 /* convert from internal format to API */
447 memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
448
449 /* due to ABI compat need to split into hi/lo */
450 fe->port_no = f->dst->port_no;
451 fe->port_hi = f->dst->port_no >> 8;
452
453 fe->is_local = f->is_local;
454 if (!f->is_static)
455 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
456 ++fe;
457 ++num;
458 }
459 }
460
461 out:
462 rcu_read_unlock();
463
464 return num;
465 }
466
467 static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
468 const unsigned char *addr,
469 __u16 vid)
470 {
471 struct net_bridge_fdb_entry *fdb;
472
473 hlist_for_each_entry(fdb, head, hlist) {
474 if (ether_addr_equal(fdb->addr.addr, addr) &&
475 fdb->vlan_id == vid)
476 return fdb;
477 }
478 return NULL;
479 }
480
481 static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
482 const unsigned char *addr,
483 __u16 vid)
484 {
485 struct net_bridge_fdb_entry *fdb;
486
487 hlist_for_each_entry_rcu(fdb, head, hlist) {
488 if (ether_addr_equal(fdb->addr.addr, addr) &&
489 fdb->vlan_id == vid)
490 return fdb;
491 }
492 return NULL;
493 }
494
495 static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
496 struct net_bridge_port *source,
497 const unsigned char *addr,
498 __u16 vid,
499 unsigned char is_local,
500 unsigned char is_static)
501 {
502 struct net_bridge_fdb_entry *fdb;
503
504 fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
505 if (fdb) {
506 memcpy(fdb->addr.addr, addr, ETH_ALEN);
507 fdb->dst = source;
508 fdb->vlan_id = vid;
509 fdb->is_local = is_local;
510 fdb->is_static = is_static;
511 fdb->added_by_user = 0;
512 fdb->added_by_external_learn = 0;
513 fdb->updated = fdb->used = jiffies;
514 hlist_add_head_rcu(&fdb->hlist, head);
515 }
516 return fdb;
517 }
518
519 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
520 const unsigned char *addr, u16 vid)
521 {
522 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
523 struct net_bridge_fdb_entry *fdb;
524
525 if (!is_valid_ether_addr(addr))
526 return -EINVAL;
527
528 fdb = fdb_find(head, addr, vid);
529 if (fdb) {
530 /* it is okay to have multiple ports with same
531 * address, just use the first one.
532 */
533 if (fdb->is_local)
534 return 0;
535 br_warn(br, "adding interface %s with same address "
536 "as a received packet\n",
537 source ? source->dev->name : br->dev->name);
538 fdb_delete(br, fdb);
539 }
540
541 fdb = fdb_create(head, source, addr, vid, 1, 1);
542 if (!fdb)
543 return -ENOMEM;
544
545 fdb_add_hw_addr(br, addr);
546 fdb_notify(br, fdb, RTM_NEWNEIGH);
547 return 0;
548 }
549
550 /* Add entry for local address of interface */
551 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
552 const unsigned char *addr, u16 vid)
553 {
554 int ret;
555
556 spin_lock_bh(&br->hash_lock);
557 ret = fdb_insert(br, source, addr, vid);
558 spin_unlock_bh(&br->hash_lock);
559 return ret;
560 }
561
562 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
563 const unsigned char *addr, u16 vid, bool added_by_user)
564 {
565 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
566 struct net_bridge_fdb_entry *fdb;
567 bool fdb_modified = false;
568
569 /* some users want to always flood. */
570 if (hold_time(br) == 0)
571 return;
572
573 /* ignore packets unless we are using this port */
574 if (!(source->state == BR_STATE_LEARNING ||
575 source->state == BR_STATE_FORWARDING))
576 return;
577
578 fdb = fdb_find_rcu(head, addr, vid);
579 if (likely(fdb)) {
580 /* attempt to update an entry for a local interface */
581 if (unlikely(fdb->is_local)) {
582 if (net_ratelimit())
583 br_warn(br, "received packet on %s with "
584 "own address as source address\n",
585 source->dev->name);
586 } else {
587 /* fastpath: update of existing entry */
588 if (unlikely(source != fdb->dst)) {
589 fdb->dst = source;
590 fdb_modified = true;
591 }
592 fdb->updated = jiffies;
593 if (unlikely(added_by_user))
594 fdb->added_by_user = 1;
595 if (unlikely(fdb_modified))
596 fdb_notify(br, fdb, RTM_NEWNEIGH);
597 }
598 } else {
599 spin_lock(&br->hash_lock);
600 if (likely(!fdb_find(head, addr, vid))) {
601 fdb = fdb_create(head, source, addr, vid, 0, 0);
602 if (fdb) {
603 if (unlikely(added_by_user))
604 fdb->added_by_user = 1;
605 fdb_notify(br, fdb, RTM_NEWNEIGH);
606 }
607 }
608 /* else we lose race and someone else inserts
609 * it first, don't bother updating
610 */
611 spin_unlock(&br->hash_lock);
612 }
613 }
614
615 static int fdb_to_nud(const struct net_bridge *br,
616 const struct net_bridge_fdb_entry *fdb)
617 {
618 if (fdb->is_local)
619 return NUD_PERMANENT;
620 else if (fdb->is_static)
621 return NUD_NOARP;
622 else if (has_expired(br, fdb))
623 return NUD_STALE;
624 else
625 return NUD_REACHABLE;
626 }
627
628 static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
629 const struct net_bridge_fdb_entry *fdb,
630 u32 portid, u32 seq, int type, unsigned int flags)
631 {
632 unsigned long now = jiffies;
633 struct nda_cacheinfo ci;
634 struct nlmsghdr *nlh;
635 struct ndmsg *ndm;
636
637 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
638 if (nlh == NULL)
639 return -EMSGSIZE;
640
641 ndm = nlmsg_data(nlh);
642 ndm->ndm_family = AF_BRIDGE;
643 ndm->ndm_pad1 = 0;
644 ndm->ndm_pad2 = 0;
645 ndm->ndm_flags = fdb->added_by_external_learn ? NTF_EXT_LEARNED : 0;
646 ndm->ndm_type = 0;
647 ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
648 ndm->ndm_state = fdb_to_nud(br, fdb);
649
650 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr))
651 goto nla_put_failure;
652 if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
653 goto nla_put_failure;
654 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
655 ci.ndm_confirmed = 0;
656 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
657 ci.ndm_refcnt = 0;
658 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
659 goto nla_put_failure;
660
661 if (fdb->vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id))
662 goto nla_put_failure;
663
664 nlmsg_end(skb, nlh);
665 return 0;
666
667 nla_put_failure:
668 nlmsg_cancel(skb, nlh);
669 return -EMSGSIZE;
670 }
671
672 static inline size_t fdb_nlmsg_size(void)
673 {
674 return NLMSG_ALIGN(sizeof(struct ndmsg))
675 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
676 + nla_total_size(sizeof(u32)) /* NDA_MASTER */
677 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
678 + nla_total_size(sizeof(struct nda_cacheinfo));
679 }
680
681 static void fdb_notify(struct net_bridge *br,
682 const struct net_bridge_fdb_entry *fdb, int type)
683 {
684 struct net *net = dev_net(br->dev);
685 struct sk_buff *skb;
686 int err = -ENOBUFS;
687
688 skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
689 if (skb == NULL)
690 goto errout;
691
692 err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
693 if (err < 0) {
694 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
695 WARN_ON(err == -EMSGSIZE);
696 kfree_skb(skb);
697 goto errout;
698 }
699 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
700 return;
701 errout:
702 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
703 }
704
705 /* Dump information about entries, in response to GETNEIGH */
706 int br_fdb_dump(struct sk_buff *skb,
707 struct netlink_callback *cb,
708 struct net_device *dev,
709 struct net_device *filter_dev,
710 int idx)
711 {
712 struct net_bridge *br = netdev_priv(dev);
713 int i;
714
715 if (!(dev->priv_flags & IFF_EBRIDGE))
716 goto out;
717
718 if (!filter_dev)
719 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
720
721 for (i = 0; i < BR_HASH_SIZE; i++) {
722 struct net_bridge_fdb_entry *f;
723
724 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
725 if (idx < cb->args[0])
726 goto skip;
727
728 if (filter_dev &&
729 (!f->dst || f->dst->dev != filter_dev)) {
730 if (filter_dev != dev)
731 goto skip;
732 /* !f->dst is a special case for bridge
733 * It means the MAC belongs to the bridge
734 * Therefore need a little more filtering
735 * we only want to dump the !f->dst case
736 */
737 if (f->dst)
738 goto skip;
739 }
740 if (!filter_dev && f->dst)
741 goto skip;
742
743 if (fdb_fill_info(skb, br, f,
744 NETLINK_CB(cb->skb).portid,
745 cb->nlh->nlmsg_seq,
746 RTM_NEWNEIGH,
747 NLM_F_MULTI) < 0)
748 break;
749 skip:
750 ++idx;
751 }
752 }
753
754 out:
755 return idx;
756 }
757
758 /* Update (create or replace) forwarding database entry */
759 static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
760 __u16 state, __u16 flags, __u16 vid)
761 {
762 struct net_bridge *br = source->br;
763 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
764 struct net_bridge_fdb_entry *fdb;
765 bool modified = false;
766
767 /* If the port cannot learn allow only local and static entries */
768 if (!(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
769 !(source->state == BR_STATE_LEARNING ||
770 source->state == BR_STATE_FORWARDING))
771 return -EPERM;
772
773 fdb = fdb_find(head, addr, vid);
774 if (fdb == NULL) {
775 if (!(flags & NLM_F_CREATE))
776 return -ENOENT;
777
778 fdb = fdb_create(head, source, addr, vid, 0, 0);
779 if (!fdb)
780 return -ENOMEM;
781
782 modified = true;
783 } else {
784 if (flags & NLM_F_EXCL)
785 return -EEXIST;
786
787 if (fdb->dst != source) {
788 fdb->dst = source;
789 modified = true;
790 }
791 }
792
793 if (fdb_to_nud(br, fdb) != state) {
794 if (state & NUD_PERMANENT) {
795 fdb->is_local = 1;
796 if (!fdb->is_static) {
797 fdb->is_static = 1;
798 fdb_add_hw_addr(br, addr);
799 }
800 } else if (state & NUD_NOARP) {
801 fdb->is_local = 0;
802 if (!fdb->is_static) {
803 fdb->is_static = 1;
804 fdb_add_hw_addr(br, addr);
805 }
806 } else {
807 fdb->is_local = 0;
808 if (fdb->is_static) {
809 fdb->is_static = 0;
810 fdb_del_hw_addr(br, addr);
811 }
812 }
813
814 modified = true;
815 }
816 fdb->added_by_user = 1;
817
818 fdb->used = jiffies;
819 if (modified) {
820 fdb->updated = jiffies;
821 fdb_notify(br, fdb, RTM_NEWNEIGH);
822 }
823
824 return 0;
825 }
826
827 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p,
828 const unsigned char *addr, u16 nlh_flags, u16 vid)
829 {
830 int err = 0;
831
832 if (ndm->ndm_flags & NTF_USE) {
833 local_bh_disable();
834 rcu_read_lock();
835 br_fdb_update(p->br, p, addr, vid, true);
836 rcu_read_unlock();
837 local_bh_enable();
838 } else {
839 spin_lock_bh(&p->br->hash_lock);
840 err = fdb_add_entry(p, addr, ndm->ndm_state,
841 nlh_flags, vid);
842 spin_unlock_bh(&p->br->hash_lock);
843 }
844
845 return err;
846 }
847
848 /* Add new permanent fdb entry with RTM_NEWNEIGH */
849 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
850 struct net_device *dev,
851 const unsigned char *addr, u16 vid, u16 nlh_flags)
852 {
853 struct net_bridge_vlan_group *vg;
854 struct net_bridge_port *p = NULL;
855 struct net_bridge_vlan *v;
856 struct net_bridge *br = NULL;
857 int err = 0;
858
859 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
860 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
861 return -EINVAL;
862 }
863
864 if (is_zero_ether_addr(addr)) {
865 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
866 return -EINVAL;
867 }
868
869 if (dev->priv_flags & IFF_EBRIDGE) {
870 br = netdev_priv(dev);
871 vg = br_vlan_group(br);
872 } else {
873 p = br_port_get_rtnl(dev);
874 if (!p) {
875 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
876 dev->name);
877 return -EINVAL;
878 }
879 vg = nbp_vlan_group(p);
880 }
881
882 if (vid) {
883 v = br_vlan_find(vg, vid);
884 if (!v || !br_vlan_should_use(v)) {
885 pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
886 return -EINVAL;
887 }
888
889 /* VID was specified, so use it. */
890 if (dev->priv_flags & IFF_EBRIDGE)
891 err = br_fdb_insert(br, NULL, addr, vid);
892 else
893 err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
894 } else {
895 if (dev->priv_flags & IFF_EBRIDGE)
896 err = br_fdb_insert(br, NULL, addr, 0);
897 else
898 err = __br_fdb_add(ndm, p, addr, nlh_flags, 0);
899 if (err || !vg || !vg->num_vlans)
900 goto out;
901
902 /* We have vlans configured on this port and user didn't
903 * specify a VLAN. To be nice, add/update entry for every
904 * vlan on this port.
905 */
906 list_for_each_entry(v, &vg->vlan_list, vlist) {
907 if (!br_vlan_should_use(v))
908 continue;
909 if (dev->priv_flags & IFF_EBRIDGE)
910 err = br_fdb_insert(br, NULL, addr, v->vid);
911 else
912 err = __br_fdb_add(ndm, p, addr, nlh_flags,
913 v->vid);
914 if (err)
915 goto out;
916 }
917 }
918
919 out:
920 return err;
921 }
922
923 static int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr,
924 u16 vid)
925 {
926 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
927 struct net_bridge_fdb_entry *fdb;
928
929 fdb = fdb_find(head, addr, vid);
930 if (!fdb)
931 return -ENOENT;
932
933 fdb_delete(br, fdb);
934 return 0;
935 }
936
937 static int __br_fdb_delete_by_addr(struct net_bridge *br,
938 const unsigned char *addr, u16 vid)
939 {
940 int err;
941
942 spin_lock_bh(&br->hash_lock);
943 err = fdb_delete_by_addr(br, addr, vid);
944 spin_unlock_bh(&br->hash_lock);
945
946 return err;
947 }
948
949 static int fdb_delete_by_addr_and_port(struct net_bridge_port *p,
950 const u8 *addr, u16 vlan)
951 {
952 struct net_bridge *br = p->br;
953 struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)];
954 struct net_bridge_fdb_entry *fdb;
955
956 fdb = fdb_find(head, addr, vlan);
957 if (!fdb || fdb->dst != p)
958 return -ENOENT;
959
960 fdb_delete(br, fdb);
961 return 0;
962 }
963
964 static int __br_fdb_delete(struct net_bridge_port *p,
965 const unsigned char *addr, u16 vid)
966 {
967 int err;
968
969 spin_lock_bh(&p->br->hash_lock);
970 err = fdb_delete_by_addr_and_port(p, addr, vid);
971 spin_unlock_bh(&p->br->hash_lock);
972
973 return err;
974 }
975
976 /* Remove neighbor entry with RTM_DELNEIGH */
977 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
978 struct net_device *dev,
979 const unsigned char *addr, u16 vid)
980 {
981 struct net_bridge_vlan_group *vg;
982 struct net_bridge_port *p = NULL;
983 struct net_bridge_vlan *v;
984 struct net_bridge *br = NULL;
985 int err;
986
987 if (dev->priv_flags & IFF_EBRIDGE) {
988 br = netdev_priv(dev);
989 vg = br_vlan_group(br);
990 } else {
991 p = br_port_get_rtnl(dev);
992 if (!p) {
993 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
994 dev->name);
995 return -EINVAL;
996 }
997 vg = nbp_vlan_group(p);
998 }
999
1000 if (vid) {
1001 v = br_vlan_find(vg, vid);
1002 if (!v) {
1003 pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1004 return -EINVAL;
1005 }
1006
1007 if (dev->priv_flags & IFF_EBRIDGE)
1008 err = __br_fdb_delete_by_addr(br, addr, vid);
1009 else
1010 err = __br_fdb_delete(p, addr, vid);
1011 } else {
1012 err = -ENOENT;
1013 if (dev->priv_flags & IFF_EBRIDGE)
1014 err = __br_fdb_delete_by_addr(br, addr, 0);
1015 else
1016 err &= __br_fdb_delete(p, addr, 0);
1017
1018 if (!vg || !vg->num_vlans)
1019 goto out;
1020
1021 list_for_each_entry(v, &vg->vlan_list, vlist) {
1022 if (!br_vlan_should_use(v))
1023 continue;
1024 if (dev->priv_flags & IFF_EBRIDGE)
1025 err = __br_fdb_delete_by_addr(br, addr, v->vid);
1026 else
1027 err &= __br_fdb_delete(p, addr, v->vid);
1028 }
1029 }
1030 out:
1031 return err;
1032 }
1033
1034 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
1035 {
1036 struct net_bridge_fdb_entry *fdb, *tmp;
1037 int i;
1038 int err;
1039
1040 ASSERT_RTNL();
1041
1042 for (i = 0; i < BR_HASH_SIZE; i++) {
1043 hlist_for_each_entry(fdb, &br->hash[i], hlist) {
1044 /* We only care for static entries */
1045 if (!fdb->is_static)
1046 continue;
1047
1048 err = dev_uc_add(p->dev, fdb->addr.addr);
1049 if (err)
1050 goto rollback;
1051 }
1052 }
1053 return 0;
1054
1055 rollback:
1056 for (i = 0; i < BR_HASH_SIZE; i++) {
1057 hlist_for_each_entry(tmp, &br->hash[i], hlist) {
1058 /* If we reached the fdb that failed, we can stop */
1059 if (tmp == fdb)
1060 break;
1061
1062 /* We only care for static entries */
1063 if (!tmp->is_static)
1064 continue;
1065
1066 dev_uc_del(p->dev, tmp->addr.addr);
1067 }
1068 }
1069 return err;
1070 }
1071
1072 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
1073 {
1074 struct net_bridge_fdb_entry *fdb;
1075 int i;
1076
1077 ASSERT_RTNL();
1078
1079 for (i = 0; i < BR_HASH_SIZE; i++) {
1080 hlist_for_each_entry_rcu(fdb, &br->hash[i], hlist) {
1081 /* We only care for static entries */
1082 if (!fdb->is_static)
1083 continue;
1084
1085 dev_uc_del(p->dev, fdb->addr.addr);
1086 }
1087 }
1088 }
1089
1090 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
1091 const unsigned char *addr, u16 vid)
1092 {
1093 struct hlist_head *head;
1094 struct net_bridge_fdb_entry *fdb;
1095 int err = 0;
1096
1097 ASSERT_RTNL();
1098 spin_lock_bh(&br->hash_lock);
1099
1100 head = &br->hash[br_mac_hash(addr, vid)];
1101 fdb = fdb_find(head, addr, vid);
1102 if (!fdb) {
1103 fdb = fdb_create(head, p, addr, vid, 0, 0);
1104 if (!fdb) {
1105 err = -ENOMEM;
1106 goto err_unlock;
1107 }
1108 fdb->added_by_external_learn = 1;
1109 fdb_notify(br, fdb, RTM_NEWNEIGH);
1110 } else if (fdb->added_by_external_learn) {
1111 /* Refresh entry */
1112 fdb->updated = fdb->used = jiffies;
1113 } else if (!fdb->added_by_user) {
1114 /* Take over SW learned entry */
1115 fdb->added_by_external_learn = 1;
1116 fdb->updated = jiffies;
1117 fdb_notify(br, fdb, RTM_NEWNEIGH);
1118 }
1119
1120 err_unlock:
1121 spin_unlock_bh(&br->hash_lock);
1122
1123 return err;
1124 }
1125
1126 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
1127 const unsigned char *addr, u16 vid)
1128 {
1129 struct hlist_head *head;
1130 struct net_bridge_fdb_entry *fdb;
1131 int err = 0;
1132
1133 ASSERT_RTNL();
1134 spin_lock_bh(&br->hash_lock);
1135
1136 head = &br->hash[br_mac_hash(addr, vid)];
1137 fdb = fdb_find(head, addr, vid);
1138 if (fdb && fdb->added_by_external_learn)
1139 fdb_delete(br, fdb);
1140 else
1141 err = -ENOENT;
1142
1143 spin_unlock_bh(&br->hash_lock);
1144
1145 return err;
1146 }
Linux with added FPC-III support