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1/*
2 * net/core/dev_addr_lists.c - Functions for handling net device lists
3 * Copyright (c) 2010 Jiri Pirko <jpirko@redhat.com>
4 *
5 * This file contains functions for working with unicast, multicast and device
6 * addresses lists.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14#include <linux/netdevice.h>
15#include <linux/rtnetlink.h>
16#include <linux/export.h>
17#include <linux/list.h>
18
19/*
20 * General list handling functions
21 */
22
23static int __hw_addr_create_ex(struct netdev_hw_addr_list *list,
24 const unsigned char *addr, int addr_len,
25 unsigned char addr_type, bool global,
26 bool sync)
27{
28 struct netdev_hw_addr *ha;
29 int alloc_size;
30
31 alloc_size = sizeof(*ha);
32 if (alloc_size < L1_CACHE_BYTES)
33 alloc_size = L1_CACHE_BYTES;
34 ha = kmalloc(alloc_size, GFP_ATOMIC);
35 if (!ha)
36 return -ENOMEM;
37 memcpy(ha->addr, addr, addr_len);
38 ha->type = addr_type;
39 ha->refcount = 1;
40 ha->global_use = global;
41 ha->synced = sync ? 1 : 0;
42 ha->sync_cnt = 0;
43 list_add_tail_rcu(&ha->list, &list->list);
44 list->count++;
45
46 return 0;
47}
48
49static int __hw_addr_add_ex(struct netdev_hw_addr_list *list,
50 const unsigned char *addr, int addr_len,
51 unsigned char addr_type, bool global, bool sync,
52 int sync_count)
53{
54 struct netdev_hw_addr *ha;
55
56 if (addr_len > MAX_ADDR_LEN)
57 return -EINVAL;
58
59 list_for_each_entry(ha, &list->list, list) {
60 if (ha->type == addr_type &&
61 !memcmp(ha->addr, addr, addr_len)) {
62 if (global) {
63 /* check if addr is already used as global */
64 if (ha->global_use)
65 return 0;
66 else
67 ha->global_use = true;
68 }
69 if (sync) {
70 if (ha->synced && sync_count)
71 return -EEXIST;
72 else
73 ha->synced++;
74 }
75 ha->refcount++;
76 return 0;
77 }
78 }
79
80 return __hw_addr_create_ex(list, addr, addr_len, addr_type, global,
81 sync);
82}
83
84static int __hw_addr_add(struct netdev_hw_addr_list *list,
85 const unsigned char *addr, int addr_len,
86 unsigned char addr_type)
87{
88 return __hw_addr_add_ex(list, addr, addr_len, addr_type, false, false,
89 0);
90}
91
92static int __hw_addr_del_entry(struct netdev_hw_addr_list *list,
93 struct netdev_hw_addr *ha, bool global,
94 bool sync)
95{
96 if (global && !ha->global_use)
97 return -ENOENT;
98
99 if (sync && !ha->synced)
100 return -ENOENT;
101
102 if (global)
103 ha->global_use = false;
104
105 if (sync)
106 ha->synced--;
107
108 if (--ha->refcount)
109 return 0;
110 list_del_rcu(&ha->list);
111 kfree_rcu(ha, rcu_head);
112 list->count--;
113 return 0;
114}
115
116static int __hw_addr_del_ex(struct netdev_hw_addr_list *list,
117 const unsigned char *addr, int addr_len,
118 unsigned char addr_type, bool global, bool sync)
119{
120 struct netdev_hw_addr *ha;
121
122 list_for_each_entry(ha, &list->list, list) {
123 if (!memcmp(ha->addr, addr, addr_len) &&
124 (ha->type == addr_type || !addr_type))
125 return __hw_addr_del_entry(list, ha, global, sync);
126 }
127 return -ENOENT;
128}
129
130static int __hw_addr_del(struct netdev_hw_addr_list *list,
131 const unsigned char *addr, int addr_len,
132 unsigned char addr_type)
133{
134 return __hw_addr_del_ex(list, addr, addr_len, addr_type, false, false);
135}
136
137static int __hw_addr_sync_one(struct netdev_hw_addr_list *to_list,
138 struct netdev_hw_addr *ha,
139 int addr_len)
140{
141 int err;
142
143 err = __hw_addr_add_ex(to_list, ha->addr, addr_len, ha->type,
144 false, true, ha->sync_cnt);
145 if (err && err != -EEXIST)
146 return err;
147
148 if (!err) {
149 ha->sync_cnt++;
150 ha->refcount++;
151 }
152
153 return 0;
154}
155
156static void __hw_addr_unsync_one(struct netdev_hw_addr_list *to_list,
157 struct netdev_hw_addr_list *from_list,
158 struct netdev_hw_addr *ha,
159 int addr_len)
160{
161 int err;
162
163 err = __hw_addr_del_ex(to_list, ha->addr, addr_len, ha->type,
164 false, true);
165 if (err)
166 return;
167 ha->sync_cnt--;
168 /* address on from list is not marked synced */
169 __hw_addr_del_entry(from_list, ha, false, false);
170}
171
172static int __hw_addr_sync_multiple(struct netdev_hw_addr_list *to_list,
173 struct netdev_hw_addr_list *from_list,
174 int addr_len)
175{
176 int err = 0;
177 struct netdev_hw_addr *ha, *tmp;
178
179 list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
180 if (ha->sync_cnt == ha->refcount) {
181 __hw_addr_unsync_one(to_list, from_list, ha, addr_len);
182 } else {
183 err = __hw_addr_sync_one(to_list, ha, addr_len);
184 if (err)
185 break;
186 }
187 }
188 return err;
189}
190
191/* This function only works where there is a strict 1-1 relationship
192 * between source and destionation of they synch. If you ever need to
193 * sync addresses to more then 1 destination, you need to use
194 * __hw_addr_sync_multiple().
195 */
196int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
197 struct netdev_hw_addr_list *from_list,
198 int addr_len)
199{
200 int err = 0;
201 struct netdev_hw_addr *ha, *tmp;
202
203 list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
204 if (!ha->sync_cnt) {
205 err = __hw_addr_sync_one(to_list, ha, addr_len);
206 if (err)
207 break;
208 } else if (ha->refcount == 1)
209 __hw_addr_unsync_one(to_list, from_list, ha, addr_len);
210 }
211 return err;
212}
213EXPORT_SYMBOL(__hw_addr_sync);
214
215void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
216 struct netdev_hw_addr_list *from_list,
217 int addr_len)
218{
219 struct netdev_hw_addr *ha, *tmp;
220
221 list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
222 if (ha->sync_cnt)
223 __hw_addr_unsync_one(to_list, from_list, ha, addr_len);
224 }
225}
226EXPORT_SYMBOL(__hw_addr_unsync);
227
228/**
229 * __hw_addr_sync_dev - Synchonize device's multicast list
230 * @list: address list to syncronize
231 * @dev: device to sync
232 * @sync: function to call if address should be added
233 * @unsync: function to call if address should be removed
234 *
235 * This funciton is intended to be called from the ndo_set_rx_mode
236 * function of devices that require explicit address add/remove
237 * notifications. The unsync function may be NULL in which case
238 * the addresses requiring removal will simply be removed without
239 * any notification to the device.
240 **/
241int __hw_addr_sync_dev(struct netdev_hw_addr_list *list,
242 struct net_device *dev,
243 int (*sync)(struct net_device *, const unsigned char *),
244 int (*unsync)(struct net_device *,
245 const unsigned char *))
246{
247 struct netdev_hw_addr *ha, *tmp;
248 int err;
249
250 /* first go through and flush out any stale entries */
251 list_for_each_entry_safe(ha, tmp, &list->list, list) {
252 if (!ha->sync_cnt || ha->refcount != 1)
253 continue;
254
255 /* if unsync is defined and fails defer unsyncing address */
256 if (unsync && unsync(dev, ha->addr))
257 continue;
258
259 ha->sync_cnt--;
260 __hw_addr_del_entry(list, ha, false, false);
261 }
262
263 /* go through and sync new entries to the list */
264 list_for_each_entry_safe(ha, tmp, &list->list, list) {
265 if (ha->sync_cnt)
266 continue;
267
268 err = sync(dev, ha->addr);
269 if (err)
270 return err;
271
272 ha->sync_cnt++;
273 ha->refcount++;
274 }
275
276 return 0;
277}
278EXPORT_SYMBOL(__hw_addr_sync_dev);
279
280/**
281 * __hw_addr_unsync_dev - Remove synchronized addresses from device
282 * @list: address list to remove synchronized addresses from
283 * @dev: device to sync
284 * @unsync: function to call if address should be removed
285 *
286 * Remove all addresses that were added to the device by __hw_addr_sync_dev().
287 * This function is intended to be called from the ndo_stop or ndo_open
288 * functions on devices that require explicit address add/remove
289 * notifications. If the unsync function pointer is NULL then this function
290 * can be used to just reset the sync_cnt for the addresses in the list.
291 **/
292void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list,
293 struct net_device *dev,
294 int (*unsync)(struct net_device *,
295 const unsigned char *))
296{
297 struct netdev_hw_addr *ha, *tmp;
298
299 list_for_each_entry_safe(ha, tmp, &list->list, list) {
300 if (!ha->sync_cnt)
301 continue;
302
303 /* if unsync is defined and fails defer unsyncing address */
304 if (unsync && unsync(dev, ha->addr))
305 continue;
306
307 ha->sync_cnt--;
308 __hw_addr_del_entry(list, ha, false, false);
309 }
310}
311EXPORT_SYMBOL(__hw_addr_unsync_dev);
312
313static void __hw_addr_flush(struct netdev_hw_addr_list *list)
314{
315 struct netdev_hw_addr *ha, *tmp;
316
317 list_for_each_entry_safe(ha, tmp, &list->list, list) {
318 list_del_rcu(&ha->list);
319 kfree_rcu(ha, rcu_head);
320 }
321 list->count = 0;
322}
323
324void __hw_addr_init(struct netdev_hw_addr_list *list)
325{
326 INIT_LIST_HEAD(&list->list);
327 list->count = 0;
328}
329EXPORT_SYMBOL(__hw_addr_init);
330
331/*
332 * Device addresses handling functions
333 */
334
335/**
336 * dev_addr_flush - Flush device address list
337 * @dev: device
338 *
339 * Flush device address list and reset ->dev_addr.
340 *
341 * The caller must hold the rtnl_mutex.
342 */
343void dev_addr_flush(struct net_device *dev)
344{
345 /* rtnl_mutex must be held here */
346
347 __hw_addr_flush(&dev->dev_addrs);
348 dev->dev_addr = NULL;
349}
350EXPORT_SYMBOL(dev_addr_flush);
351
352/**
353 * dev_addr_init - Init device address list
354 * @dev: device
355 *
356 * Init device address list and create the first element,
357 * used by ->dev_addr.
358 *
359 * The caller must hold the rtnl_mutex.
360 */
361int dev_addr_init(struct net_device *dev)
362{
363 unsigned char addr[MAX_ADDR_LEN];
364 struct netdev_hw_addr *ha;
365 int err;
366
367 /* rtnl_mutex must be held here */
368
369 __hw_addr_init(&dev->dev_addrs);
370 memset(addr, 0, sizeof(addr));
371 err = __hw_addr_add(&dev->dev_addrs, addr, sizeof(addr),
372 NETDEV_HW_ADDR_T_LAN);
373 if (!err) {
374 /*
375 * Get the first (previously created) address from the list
376 * and set dev_addr pointer to this location.
377 */
378 ha = list_first_entry(&dev->dev_addrs.list,
379 struct netdev_hw_addr, list);
380 dev->dev_addr = ha->addr;
381 }
382 return err;
383}
384EXPORT_SYMBOL(dev_addr_init);
385
386/**
387 * dev_addr_add - Add a device address
388 * @dev: device
389 * @addr: address to add
390 * @addr_type: address type
391 *
392 * Add a device address to the device or increase the reference count if
393 * it already exists.
394 *
395 * The caller must hold the rtnl_mutex.
396 */
397int dev_addr_add(struct net_device *dev, const unsigned char *addr,
398 unsigned char addr_type)
399{
400 int err;
401
402 ASSERT_RTNL();
403
404 err = __hw_addr_add(&dev->dev_addrs, addr, dev->addr_len, addr_type);
405 if (!err)
406 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
407 return err;
408}
409EXPORT_SYMBOL(dev_addr_add);
410
411/**
412 * dev_addr_del - Release a device address.
413 * @dev: device
414 * @addr: address to delete
415 * @addr_type: address type
416 *
417 * Release reference to a device address and remove it from the device
418 * if the reference count drops to zero.
419 *
420 * The caller must hold the rtnl_mutex.
421 */
422int dev_addr_del(struct net_device *dev, const unsigned char *addr,
423 unsigned char addr_type)
424{
425 int err;
426 struct netdev_hw_addr *ha;
427
428 ASSERT_RTNL();
429
430 /*
431 * We can not remove the first address from the list because
432 * dev->dev_addr points to that.
433 */
434 ha = list_first_entry(&dev->dev_addrs.list,
435 struct netdev_hw_addr, list);
436 if (!memcmp(ha->addr, addr, dev->addr_len) &&
437 ha->type == addr_type && ha->refcount == 1)
438 return -ENOENT;
439
440 err = __hw_addr_del(&dev->dev_addrs, addr, dev->addr_len,
441 addr_type);
442 if (!err)
443 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
444 return err;
445}
446EXPORT_SYMBOL(dev_addr_del);
447
448/*
449 * Unicast list handling functions
450 */
451
452/**
453 * dev_uc_add_excl - Add a global secondary unicast address
454 * @dev: device
455 * @addr: address to add
456 */
457int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr)
458{
459 struct netdev_hw_addr *ha;
460 int err;
461
462 netif_addr_lock_bh(dev);
463 list_for_each_entry(ha, &dev->uc.list, list) {
464 if (!memcmp(ha->addr, addr, dev->addr_len) &&
465 ha->type == NETDEV_HW_ADDR_T_UNICAST) {
466 err = -EEXIST;
467 goto out;
468 }
469 }
470 err = __hw_addr_create_ex(&dev->uc, addr, dev->addr_len,
471 NETDEV_HW_ADDR_T_UNICAST, true, false);
472 if (!err)
473 __dev_set_rx_mode(dev);
474out:
475 netif_addr_unlock_bh(dev);
476 return err;
477}
478EXPORT_SYMBOL(dev_uc_add_excl);
479
480/**
481 * dev_uc_add - Add a secondary unicast address
482 * @dev: device
483 * @addr: address to add
484 *
485 * Add a secondary unicast address to the device or increase
486 * the reference count if it already exists.
487 */
488int dev_uc_add(struct net_device *dev, const unsigned char *addr)
489{
490 int err;
491
492 netif_addr_lock_bh(dev);
493 err = __hw_addr_add(&dev->uc, addr, dev->addr_len,
494 NETDEV_HW_ADDR_T_UNICAST);
495 if (!err)
496 __dev_set_rx_mode(dev);
497 netif_addr_unlock_bh(dev);
498 return err;
499}
500EXPORT_SYMBOL(dev_uc_add);
501
502/**
503 * dev_uc_del - Release secondary unicast address.
504 * @dev: device
505 * @addr: address to delete
506 *
507 * Release reference to a secondary unicast address and remove it
508 * from the device if the reference count drops to zero.
509 */
510int dev_uc_del(struct net_device *dev, const unsigned char *addr)
511{
512 int err;
513
514 netif_addr_lock_bh(dev);
515 err = __hw_addr_del(&dev->uc, addr, dev->addr_len,
516 NETDEV_HW_ADDR_T_UNICAST);
517 if (!err)
518 __dev_set_rx_mode(dev);
519 netif_addr_unlock_bh(dev);
520 return err;
521}
522EXPORT_SYMBOL(dev_uc_del);
523
524/**
525 * dev_uc_sync - Synchronize device's unicast list to another device
526 * @to: destination device
527 * @from: source device
528 *
529 * Add newly added addresses to the destination device and release
530 * addresses that have no users left. The source device must be
531 * locked by netif_addr_lock_bh.
532 *
533 * This function is intended to be called from the dev->set_rx_mode
534 * function of layered software devices. This function assumes that
535 * addresses will only ever be synced to the @to devices and no other.
536 */
537int dev_uc_sync(struct net_device *to, struct net_device *from)
538{
539 int err = 0;
540
541 if (to->addr_len != from->addr_len)
542 return -EINVAL;
543
544 netif_addr_lock_nested(to);
545 err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len);
546 if (!err)
547 __dev_set_rx_mode(to);
548 netif_addr_unlock(to);
549 return err;
550}
551EXPORT_SYMBOL(dev_uc_sync);
552
553/**
554 * dev_uc_sync_multiple - Synchronize device's unicast list to another
555 * device, but allow for multiple calls to sync to multiple devices.
556 * @to: destination device
557 * @from: source device
558 *
559 * Add newly added addresses to the destination device and release
560 * addresses that have been deleted from the source. The source device
561 * must be locked by netif_addr_lock_bh.
562 *
563 * This function is intended to be called from the dev->set_rx_mode
564 * function of layered software devices. It allows for a single source
565 * device to be synced to multiple destination devices.
566 */
567int dev_uc_sync_multiple(struct net_device *to, struct net_device *from)
568{
569 int err = 0;
570
571 if (to->addr_len != from->addr_len)
572 return -EINVAL;
573
574 netif_addr_lock_nested(to);
575 err = __hw_addr_sync_multiple(&to->uc, &from->uc, to->addr_len);
576 if (!err)
577 __dev_set_rx_mode(to);
578 netif_addr_unlock(to);
579 return err;
580}
581EXPORT_SYMBOL(dev_uc_sync_multiple);
582
583/**
584 * dev_uc_unsync - Remove synchronized addresses from the destination device
585 * @to: destination device
586 * @from: source device
587 *
588 * Remove all addresses that were added to the destination device by
589 * dev_uc_sync(). This function is intended to be called from the
590 * dev->stop function of layered software devices.
591 */
592void dev_uc_unsync(struct net_device *to, struct net_device *from)
593{
594 if (to->addr_len != from->addr_len)
595 return;
596
597 netif_addr_lock_bh(from);
598 netif_addr_lock_nested(to);
599 __hw_addr_unsync(&to->uc, &from->uc, to->addr_len);
600 __dev_set_rx_mode(to);
601 netif_addr_unlock(to);
602 netif_addr_unlock_bh(from);
603}
604EXPORT_SYMBOL(dev_uc_unsync);
605
606/**
607 * dev_uc_flush - Flush unicast addresses
608 * @dev: device
609 *
610 * Flush unicast addresses.
611 */
612void dev_uc_flush(struct net_device *dev)
613{
614 netif_addr_lock_bh(dev);
615 __hw_addr_flush(&dev->uc);
616 netif_addr_unlock_bh(dev);
617}
618EXPORT_SYMBOL(dev_uc_flush);
619
620/**
621 * dev_uc_flush - Init unicast address list
622 * @dev: device
623 *
624 * Init unicast address list.
625 */
626void dev_uc_init(struct net_device *dev)
627{
628 __hw_addr_init(&dev->uc);
629}
630EXPORT_SYMBOL(dev_uc_init);
631
632/*
633 * Multicast list handling functions
634 */
635
636/**
637 * dev_mc_add_excl - Add a global secondary multicast address
638 * @dev: device
639 * @addr: address to add
640 */
641int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr)
642{
643 struct netdev_hw_addr *ha;
644 int err;
645
646 netif_addr_lock_bh(dev);
647 list_for_each_entry(ha, &dev->mc.list, list) {
648 if (!memcmp(ha->addr, addr, dev->addr_len) &&
649 ha->type == NETDEV_HW_ADDR_T_MULTICAST) {
650 err = -EEXIST;
651 goto out;
652 }
653 }
654 err = __hw_addr_create_ex(&dev->mc, addr, dev->addr_len,
655 NETDEV_HW_ADDR_T_MULTICAST, true, false);
656 if (!err)
657 __dev_set_rx_mode(dev);
658out:
659 netif_addr_unlock_bh(dev);
660 return err;
661}
662EXPORT_SYMBOL(dev_mc_add_excl);
663
664static int __dev_mc_add(struct net_device *dev, const unsigned char *addr,
665 bool global)
666{
667 int err;
668
669 netif_addr_lock_bh(dev);
670 err = __hw_addr_add_ex(&dev->mc, addr, dev->addr_len,
671 NETDEV_HW_ADDR_T_MULTICAST, global, false, 0);
672 if (!err)
673 __dev_set_rx_mode(dev);
674 netif_addr_unlock_bh(dev);
675 return err;
676}
677/**
678 * dev_mc_add - Add a multicast address
679 * @dev: device
680 * @addr: address to add
681 *
682 * Add a multicast address to the device or increase
683 * the reference count if it already exists.
684 */
685int dev_mc_add(struct net_device *dev, const unsigned char *addr)
686{
687 return __dev_mc_add(dev, addr, false);
688}
689EXPORT_SYMBOL(dev_mc_add);
690
691/**
692 * dev_mc_add_global - Add a global multicast address
693 * @dev: device
694 * @addr: address to add
695 *
696 * Add a global multicast address to the device.
697 */
698int dev_mc_add_global(struct net_device *dev, const unsigned char *addr)
699{
700 return __dev_mc_add(dev, addr, true);
701}
702EXPORT_SYMBOL(dev_mc_add_global);
703
704static int __dev_mc_del(struct net_device *dev, const unsigned char *addr,
705 bool global)
706{
707 int err;
708
709 netif_addr_lock_bh(dev);
710 err = __hw_addr_del_ex(&dev->mc, addr, dev->addr_len,
711 NETDEV_HW_ADDR_T_MULTICAST, global, false);
712 if (!err)
713 __dev_set_rx_mode(dev);
714 netif_addr_unlock_bh(dev);
715 return err;
716}
717
718/**
719 * dev_mc_del - Delete a multicast address.
720 * @dev: device
721 * @addr: address to delete
722 *
723 * Release reference to a multicast address and remove it
724 * from the device if the reference count drops to zero.
725 */
726int dev_mc_del(struct net_device *dev, const unsigned char *addr)
727{
728 return __dev_mc_del(dev, addr, false);
729}
730EXPORT_SYMBOL(dev_mc_del);
731
732/**
733 * dev_mc_del_global - Delete a global multicast address.
734 * @dev: device
735 * @addr: address to delete
736 *
737 * Release reference to a multicast address and remove it
738 * from the device if the reference count drops to zero.
739 */
740int dev_mc_del_global(struct net_device *dev, const unsigned char *addr)
741{
742 return __dev_mc_del(dev, addr, true);
743}
744EXPORT_SYMBOL(dev_mc_del_global);
745
746/**
747 * dev_mc_sync - Synchronize device's multicast list to another device
748 * @to: destination device
749 * @from: source device
750 *
751 * Add newly added addresses to the destination device and release
752 * addresses that have no users left. The source device must be
753 * locked by netif_addr_lock_bh.
754 *
755 * This function is intended to be called from the ndo_set_rx_mode
756 * function of layered software devices.
757 */
758int dev_mc_sync(struct net_device *to, struct net_device *from)
759{
760 int err = 0;
761
762 if (to->addr_len != from->addr_len)
763 return -EINVAL;
764
765 netif_addr_lock_nested(to);
766 err = __hw_addr_sync(&to->mc, &from->mc, to->addr_len);
767 if (!err)
768 __dev_set_rx_mode(to);
769 netif_addr_unlock(to);
770 return err;
771}
772EXPORT_SYMBOL(dev_mc_sync);
773
774/**
775 * dev_mc_sync_multiple - Synchronize device's multicast list to another
776 * device, but allow for multiple calls to sync to multiple devices.
777 * @to: destination device
778 * @from: source device
779 *
780 * Add newly added addresses to the destination device and release
781 * addresses that have no users left. The source device must be
782 * locked by netif_addr_lock_bh.
783 *
784 * This function is intended to be called from the ndo_set_rx_mode
785 * function of layered software devices. It allows for a single
786 * source device to be synced to multiple destination devices.
787 */
788int dev_mc_sync_multiple(struct net_device *to, struct net_device *from)
789{
790 int err = 0;
791
792 if (to->addr_len != from->addr_len)
793 return -EINVAL;
794
795 netif_addr_lock_nested(to);
796 err = __hw_addr_sync_multiple(&to->mc, &from->mc, to->addr_len);
797 if (!err)
798 __dev_set_rx_mode(to);
799 netif_addr_unlock(to);
800 return err;
801}
802EXPORT_SYMBOL(dev_mc_sync_multiple);
803
804/**
805 * dev_mc_unsync - Remove synchronized addresses from the destination device
806 * @to: destination device
807 * @from: source device
808 *
809 * Remove all addresses that were added to the destination device by
810 * dev_mc_sync(). This function is intended to be called from the
811 * dev->stop function of layered software devices.
812 */
813void dev_mc_unsync(struct net_device *to, struct net_device *from)
814{
815 if (to->addr_len != from->addr_len)
816 return;
817
818 netif_addr_lock_bh(from);
819 netif_addr_lock_nested(to);
820 __hw_addr_unsync(&to->mc, &from->mc, to->addr_len);
821 __dev_set_rx_mode(to);
822 netif_addr_unlock(to);
823 netif_addr_unlock_bh(from);
824}
825EXPORT_SYMBOL(dev_mc_unsync);
826
827/**
828 * dev_mc_flush - Flush multicast addresses
829 * @dev: device
830 *
831 * Flush multicast addresses.
832 */
833void dev_mc_flush(struct net_device *dev)
834{
835 netif_addr_lock_bh(dev);
836 __hw_addr_flush(&dev->mc);
837 netif_addr_unlock_bh(dev);
838}
839EXPORT_SYMBOL(dev_mc_flush);
840
841/**
842 * dev_mc_init - Init multicast address list
843 * @dev: device
844 *
845 * Init multicast address list.
846 */
847void dev_mc_init(struct net_device *dev)
848{
849 __hw_addr_init(&dev->mc);
850}
851EXPORT_SYMBOL(dev_mc_init);
1/*
2 * net/core/dev_addr_lists.c - Functions for handling net device lists
3 * Copyright (c) 2010 Jiri Pirko <jpirko@redhat.com>
4 *
5 * This file contains functions for working with unicast, multicast and device
6 * addresses lists.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14#include <linux/netdevice.h>
15#include <linux/rtnetlink.h>
16#include <linux/export.h>
17#include <linux/list.h>
18#include <linux/proc_fs.h>
19
20/*
21 * General list handling functions
22 */
23
24static int __hw_addr_create_ex(struct netdev_hw_addr_list *list,
25 unsigned char *addr, int addr_len,
26 unsigned char addr_type, bool global)
27{
28 struct netdev_hw_addr *ha;
29 int alloc_size;
30
31 alloc_size = sizeof(*ha);
32 if (alloc_size < L1_CACHE_BYTES)
33 alloc_size = L1_CACHE_BYTES;
34 ha = kmalloc(alloc_size, GFP_ATOMIC);
35 if (!ha)
36 return -ENOMEM;
37 memcpy(ha->addr, addr, addr_len);
38 ha->type = addr_type;
39 ha->refcount = 1;
40 ha->global_use = global;
41 ha->synced = false;
42 list_add_tail_rcu(&ha->list, &list->list);
43 list->count++;
44
45 return 0;
46}
47
48static int __hw_addr_add_ex(struct netdev_hw_addr_list *list,
49 unsigned char *addr, int addr_len,
50 unsigned char addr_type, bool global)
51{
52 struct netdev_hw_addr *ha;
53
54 if (addr_len > MAX_ADDR_LEN)
55 return -EINVAL;
56
57 list_for_each_entry(ha, &list->list, list) {
58 if (!memcmp(ha->addr, addr, addr_len) &&
59 ha->type == addr_type) {
60 if (global) {
61 /* check if addr is already used as global */
62 if (ha->global_use)
63 return 0;
64 else
65 ha->global_use = true;
66 }
67 ha->refcount++;
68 return 0;
69 }
70 }
71
72 return __hw_addr_create_ex(list, addr, addr_len, addr_type, global);
73}
74
75static int __hw_addr_add(struct netdev_hw_addr_list *list, unsigned char *addr,
76 int addr_len, unsigned char addr_type)
77{
78 return __hw_addr_add_ex(list, addr, addr_len, addr_type, false);
79}
80
81static int __hw_addr_del_ex(struct netdev_hw_addr_list *list,
82 unsigned char *addr, int addr_len,
83 unsigned char addr_type, bool global)
84{
85 struct netdev_hw_addr *ha;
86
87 list_for_each_entry(ha, &list->list, list) {
88 if (!memcmp(ha->addr, addr, addr_len) &&
89 (ha->type == addr_type || !addr_type)) {
90 if (global) {
91 if (!ha->global_use)
92 break;
93 else
94 ha->global_use = false;
95 }
96 if (--ha->refcount)
97 return 0;
98 list_del_rcu(&ha->list);
99 kfree_rcu(ha, rcu_head);
100 list->count--;
101 return 0;
102 }
103 }
104 return -ENOENT;
105}
106
107static int __hw_addr_del(struct netdev_hw_addr_list *list, unsigned char *addr,
108 int addr_len, unsigned char addr_type)
109{
110 return __hw_addr_del_ex(list, addr, addr_len, addr_type, false);
111}
112
113int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
114 struct netdev_hw_addr_list *from_list,
115 int addr_len, unsigned char addr_type)
116{
117 int err;
118 struct netdev_hw_addr *ha, *ha2;
119 unsigned char type;
120
121 list_for_each_entry(ha, &from_list->list, list) {
122 type = addr_type ? addr_type : ha->type;
123 err = __hw_addr_add(to_list, ha->addr, addr_len, type);
124 if (err)
125 goto unroll;
126 }
127 return 0;
128
129unroll:
130 list_for_each_entry(ha2, &from_list->list, list) {
131 if (ha2 == ha)
132 break;
133 type = addr_type ? addr_type : ha2->type;
134 __hw_addr_del(to_list, ha2->addr, addr_len, type);
135 }
136 return err;
137}
138EXPORT_SYMBOL(__hw_addr_add_multiple);
139
140void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
141 struct netdev_hw_addr_list *from_list,
142 int addr_len, unsigned char addr_type)
143{
144 struct netdev_hw_addr *ha;
145 unsigned char type;
146
147 list_for_each_entry(ha, &from_list->list, list) {
148 type = addr_type ? addr_type : ha->type;
149 __hw_addr_del(to_list, ha->addr, addr_len, type);
150 }
151}
152EXPORT_SYMBOL(__hw_addr_del_multiple);
153
154int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
155 struct netdev_hw_addr_list *from_list,
156 int addr_len)
157{
158 int err = 0;
159 struct netdev_hw_addr *ha, *tmp;
160
161 list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
162 if (!ha->synced) {
163 err = __hw_addr_add(to_list, ha->addr,
164 addr_len, ha->type);
165 if (err)
166 break;
167 ha->synced = true;
168 ha->refcount++;
169 } else if (ha->refcount == 1) {
170 __hw_addr_del(to_list, ha->addr, addr_len, ha->type);
171 __hw_addr_del(from_list, ha->addr, addr_len, ha->type);
172 }
173 }
174 return err;
175}
176EXPORT_SYMBOL(__hw_addr_sync);
177
178void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
179 struct netdev_hw_addr_list *from_list,
180 int addr_len)
181{
182 struct netdev_hw_addr *ha, *tmp;
183
184 list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
185 if (ha->synced) {
186 __hw_addr_del(to_list, ha->addr,
187 addr_len, ha->type);
188 ha->synced = false;
189 __hw_addr_del(from_list, ha->addr,
190 addr_len, ha->type);
191 }
192 }
193}
194EXPORT_SYMBOL(__hw_addr_unsync);
195
196void __hw_addr_flush(struct netdev_hw_addr_list *list)
197{
198 struct netdev_hw_addr *ha, *tmp;
199
200 list_for_each_entry_safe(ha, tmp, &list->list, list) {
201 list_del_rcu(&ha->list);
202 kfree_rcu(ha, rcu_head);
203 }
204 list->count = 0;
205}
206EXPORT_SYMBOL(__hw_addr_flush);
207
208void __hw_addr_init(struct netdev_hw_addr_list *list)
209{
210 INIT_LIST_HEAD(&list->list);
211 list->count = 0;
212}
213EXPORT_SYMBOL(__hw_addr_init);
214
215/*
216 * Device addresses handling functions
217 */
218
219/**
220 * dev_addr_flush - Flush device address list
221 * @dev: device
222 *
223 * Flush device address list and reset ->dev_addr.
224 *
225 * The caller must hold the rtnl_mutex.
226 */
227void dev_addr_flush(struct net_device *dev)
228{
229 /* rtnl_mutex must be held here */
230
231 __hw_addr_flush(&dev->dev_addrs);
232 dev->dev_addr = NULL;
233}
234EXPORT_SYMBOL(dev_addr_flush);
235
236/**
237 * dev_addr_init - Init device address list
238 * @dev: device
239 *
240 * Init device address list and create the first element,
241 * used by ->dev_addr.
242 *
243 * The caller must hold the rtnl_mutex.
244 */
245int dev_addr_init(struct net_device *dev)
246{
247 unsigned char addr[MAX_ADDR_LEN];
248 struct netdev_hw_addr *ha;
249 int err;
250
251 /* rtnl_mutex must be held here */
252
253 __hw_addr_init(&dev->dev_addrs);
254 memset(addr, 0, sizeof(addr));
255 err = __hw_addr_add(&dev->dev_addrs, addr, sizeof(addr),
256 NETDEV_HW_ADDR_T_LAN);
257 if (!err) {
258 /*
259 * Get the first (previously created) address from the list
260 * and set dev_addr pointer to this location.
261 */
262 ha = list_first_entry(&dev->dev_addrs.list,
263 struct netdev_hw_addr, list);
264 dev->dev_addr = ha->addr;
265 }
266 return err;
267}
268EXPORT_SYMBOL(dev_addr_init);
269
270/**
271 * dev_addr_add - Add a device address
272 * @dev: device
273 * @addr: address to add
274 * @addr_type: address type
275 *
276 * Add a device address to the device or increase the reference count if
277 * it already exists.
278 *
279 * The caller must hold the rtnl_mutex.
280 */
281int dev_addr_add(struct net_device *dev, unsigned char *addr,
282 unsigned char addr_type)
283{
284 int err;
285
286 ASSERT_RTNL();
287
288 err = __hw_addr_add(&dev->dev_addrs, addr, dev->addr_len, addr_type);
289 if (!err)
290 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
291 return err;
292}
293EXPORT_SYMBOL(dev_addr_add);
294
295/**
296 * dev_addr_del - Release a device address.
297 * @dev: device
298 * @addr: address to delete
299 * @addr_type: address type
300 *
301 * Release reference to a device address and remove it from the device
302 * if the reference count drops to zero.
303 *
304 * The caller must hold the rtnl_mutex.
305 */
306int dev_addr_del(struct net_device *dev, unsigned char *addr,
307 unsigned char addr_type)
308{
309 int err;
310 struct netdev_hw_addr *ha;
311
312 ASSERT_RTNL();
313
314 /*
315 * We can not remove the first address from the list because
316 * dev->dev_addr points to that.
317 */
318 ha = list_first_entry(&dev->dev_addrs.list,
319 struct netdev_hw_addr, list);
320 if (ha->addr == dev->dev_addr && ha->refcount == 1)
321 return -ENOENT;
322
323 err = __hw_addr_del(&dev->dev_addrs, addr, dev->addr_len,
324 addr_type);
325 if (!err)
326 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
327 return err;
328}
329EXPORT_SYMBOL(dev_addr_del);
330
331/**
332 * dev_addr_add_multiple - Add device addresses from another device
333 * @to_dev: device to which addresses will be added
334 * @from_dev: device from which addresses will be added
335 * @addr_type: address type - 0 means type will be used from from_dev
336 *
337 * Add device addresses of the one device to another.
338 **
339 * The caller must hold the rtnl_mutex.
340 */
341int dev_addr_add_multiple(struct net_device *to_dev,
342 struct net_device *from_dev,
343 unsigned char addr_type)
344{
345 int err;
346
347 ASSERT_RTNL();
348
349 if (from_dev->addr_len != to_dev->addr_len)
350 return -EINVAL;
351 err = __hw_addr_add_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs,
352 to_dev->addr_len, addr_type);
353 if (!err)
354 call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev);
355 return err;
356}
357EXPORT_SYMBOL(dev_addr_add_multiple);
358
359/**
360 * dev_addr_del_multiple - Delete device addresses by another device
361 * @to_dev: device where the addresses will be deleted
362 * @from_dev: device supplying the addresses to be deleted
363 * @addr_type: address type - 0 means type will be used from from_dev
364 *
365 * Deletes addresses in to device by the list of addresses in from device.
366 *
367 * The caller must hold the rtnl_mutex.
368 */
369int dev_addr_del_multiple(struct net_device *to_dev,
370 struct net_device *from_dev,
371 unsigned char addr_type)
372{
373 ASSERT_RTNL();
374
375 if (from_dev->addr_len != to_dev->addr_len)
376 return -EINVAL;
377 __hw_addr_del_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs,
378 to_dev->addr_len, addr_type);
379 call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev);
380 return 0;
381}
382EXPORT_SYMBOL(dev_addr_del_multiple);
383
384/*
385 * Unicast list handling functions
386 */
387
388/**
389 * dev_uc_add_excl - Add a global secondary unicast address
390 * @dev: device
391 * @addr: address to add
392 */
393int dev_uc_add_excl(struct net_device *dev, unsigned char *addr)
394{
395 struct netdev_hw_addr *ha;
396 int err;
397
398 netif_addr_lock_bh(dev);
399 list_for_each_entry(ha, &dev->uc.list, list) {
400 if (!memcmp(ha->addr, addr, dev->addr_len) &&
401 ha->type == NETDEV_HW_ADDR_T_UNICAST) {
402 err = -EEXIST;
403 goto out;
404 }
405 }
406 err = __hw_addr_create_ex(&dev->uc, addr, dev->addr_len,
407 NETDEV_HW_ADDR_T_UNICAST, true);
408 if (!err)
409 __dev_set_rx_mode(dev);
410out:
411 netif_addr_unlock_bh(dev);
412 return err;
413}
414EXPORT_SYMBOL(dev_uc_add_excl);
415
416/**
417 * dev_uc_add - Add a secondary unicast address
418 * @dev: device
419 * @addr: address to add
420 *
421 * Add a secondary unicast address to the device or increase
422 * the reference count if it already exists.
423 */
424int dev_uc_add(struct net_device *dev, unsigned char *addr)
425{
426 int err;
427
428 netif_addr_lock_bh(dev);
429 err = __hw_addr_add(&dev->uc, addr, dev->addr_len,
430 NETDEV_HW_ADDR_T_UNICAST);
431 if (!err)
432 __dev_set_rx_mode(dev);
433 netif_addr_unlock_bh(dev);
434 return err;
435}
436EXPORT_SYMBOL(dev_uc_add);
437
438/**
439 * dev_uc_del - Release secondary unicast address.
440 * @dev: device
441 * @addr: address to delete
442 *
443 * Release reference to a secondary unicast address and remove it
444 * from the device if the reference count drops to zero.
445 */
446int dev_uc_del(struct net_device *dev, unsigned char *addr)
447{
448 int err;
449
450 netif_addr_lock_bh(dev);
451 err = __hw_addr_del(&dev->uc, addr, dev->addr_len,
452 NETDEV_HW_ADDR_T_UNICAST);
453 if (!err)
454 __dev_set_rx_mode(dev);
455 netif_addr_unlock_bh(dev);
456 return err;
457}
458EXPORT_SYMBOL(dev_uc_del);
459
460/**
461 * dev_uc_sync - Synchronize device's unicast list to another device
462 * @to: destination device
463 * @from: source device
464 *
465 * Add newly added addresses to the destination device and release
466 * addresses that have no users left. The source device must be
467 * locked by netif_addr_lock_bh.
468 *
469 * This function is intended to be called from the dev->set_rx_mode
470 * function of layered software devices.
471 */
472int dev_uc_sync(struct net_device *to, struct net_device *from)
473{
474 int err = 0;
475
476 if (to->addr_len != from->addr_len)
477 return -EINVAL;
478
479 netif_addr_lock_nested(to);
480 err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len);
481 if (!err)
482 __dev_set_rx_mode(to);
483 netif_addr_unlock(to);
484 return err;
485}
486EXPORT_SYMBOL(dev_uc_sync);
487
488/**
489 * dev_uc_unsync - Remove synchronized addresses from the destination device
490 * @to: destination device
491 * @from: source device
492 *
493 * Remove all addresses that were added to the destination device by
494 * dev_uc_sync(). This function is intended to be called from the
495 * dev->stop function of layered software devices.
496 */
497void dev_uc_unsync(struct net_device *to, struct net_device *from)
498{
499 if (to->addr_len != from->addr_len)
500 return;
501
502 netif_addr_lock_bh(from);
503 netif_addr_lock_nested(to);
504 __hw_addr_unsync(&to->uc, &from->uc, to->addr_len);
505 __dev_set_rx_mode(to);
506 netif_addr_unlock(to);
507 netif_addr_unlock_bh(from);
508}
509EXPORT_SYMBOL(dev_uc_unsync);
510
511/**
512 * dev_uc_flush - Flush unicast addresses
513 * @dev: device
514 *
515 * Flush unicast addresses.
516 */
517void dev_uc_flush(struct net_device *dev)
518{
519 netif_addr_lock_bh(dev);
520 __hw_addr_flush(&dev->uc);
521 netif_addr_unlock_bh(dev);
522}
523EXPORT_SYMBOL(dev_uc_flush);
524
525/**
526 * dev_uc_flush - Init unicast address list
527 * @dev: device
528 *
529 * Init unicast address list.
530 */
531void dev_uc_init(struct net_device *dev)
532{
533 __hw_addr_init(&dev->uc);
534}
535EXPORT_SYMBOL(dev_uc_init);
536
537/*
538 * Multicast list handling functions
539 */
540
541/**
542 * dev_mc_add_excl - Add a global secondary multicast address
543 * @dev: device
544 * @addr: address to add
545 */
546int dev_mc_add_excl(struct net_device *dev, unsigned char *addr)
547{
548 struct netdev_hw_addr *ha;
549 int err;
550
551 netif_addr_lock_bh(dev);
552 list_for_each_entry(ha, &dev->mc.list, list) {
553 if (!memcmp(ha->addr, addr, dev->addr_len) &&
554 ha->type == NETDEV_HW_ADDR_T_MULTICAST) {
555 err = -EEXIST;
556 goto out;
557 }
558 }
559 err = __hw_addr_create_ex(&dev->mc, addr, dev->addr_len,
560 NETDEV_HW_ADDR_T_MULTICAST, true);
561 if (!err)
562 __dev_set_rx_mode(dev);
563out:
564 netif_addr_unlock_bh(dev);
565 return err;
566}
567EXPORT_SYMBOL(dev_mc_add_excl);
568
569static int __dev_mc_add(struct net_device *dev, unsigned char *addr,
570 bool global)
571{
572 int err;
573
574 netif_addr_lock_bh(dev);
575 err = __hw_addr_add_ex(&dev->mc, addr, dev->addr_len,
576 NETDEV_HW_ADDR_T_MULTICAST, global);
577 if (!err)
578 __dev_set_rx_mode(dev);
579 netif_addr_unlock_bh(dev);
580 return err;
581}
582/**
583 * dev_mc_add - Add a multicast address
584 * @dev: device
585 * @addr: address to add
586 *
587 * Add a multicast address to the device or increase
588 * the reference count if it already exists.
589 */
590int dev_mc_add(struct net_device *dev, unsigned char *addr)
591{
592 return __dev_mc_add(dev, addr, false);
593}
594EXPORT_SYMBOL(dev_mc_add);
595
596/**
597 * dev_mc_add_global - Add a global multicast address
598 * @dev: device
599 * @addr: address to add
600 *
601 * Add a global multicast address to the device.
602 */
603int dev_mc_add_global(struct net_device *dev, unsigned char *addr)
604{
605 return __dev_mc_add(dev, addr, true);
606}
607EXPORT_SYMBOL(dev_mc_add_global);
608
609static int __dev_mc_del(struct net_device *dev, unsigned char *addr,
610 bool global)
611{
612 int err;
613
614 netif_addr_lock_bh(dev);
615 err = __hw_addr_del_ex(&dev->mc, addr, dev->addr_len,
616 NETDEV_HW_ADDR_T_MULTICAST, global);
617 if (!err)
618 __dev_set_rx_mode(dev);
619 netif_addr_unlock_bh(dev);
620 return err;
621}
622
623/**
624 * dev_mc_del - Delete a multicast address.
625 * @dev: device
626 * @addr: address to delete
627 *
628 * Release reference to a multicast address and remove it
629 * from the device if the reference count drops to zero.
630 */
631int dev_mc_del(struct net_device *dev, unsigned char *addr)
632{
633 return __dev_mc_del(dev, addr, false);
634}
635EXPORT_SYMBOL(dev_mc_del);
636
637/**
638 * dev_mc_del_global - Delete a global multicast address.
639 * @dev: device
640 * @addr: address to delete
641 *
642 * Release reference to a multicast address and remove it
643 * from the device if the reference count drops to zero.
644 */
645int dev_mc_del_global(struct net_device *dev, unsigned char *addr)
646{
647 return __dev_mc_del(dev, addr, true);
648}
649EXPORT_SYMBOL(dev_mc_del_global);
650
651/**
652 * dev_mc_sync - Synchronize device's unicast list to another device
653 * @to: destination device
654 * @from: source device
655 *
656 * Add newly added addresses to the destination device and release
657 * addresses that have no users left. The source device must be
658 * locked by netif_addr_lock_bh.
659 *
660 * This function is intended to be called from the ndo_set_rx_mode
661 * function of layered software devices.
662 */
663int dev_mc_sync(struct net_device *to, struct net_device *from)
664{
665 int err = 0;
666
667 if (to->addr_len != from->addr_len)
668 return -EINVAL;
669
670 netif_addr_lock_nested(to);
671 err = __hw_addr_sync(&to->mc, &from->mc, to->addr_len);
672 if (!err)
673 __dev_set_rx_mode(to);
674 netif_addr_unlock(to);
675 return err;
676}
677EXPORT_SYMBOL(dev_mc_sync);
678
679/**
680 * dev_mc_unsync - Remove synchronized addresses from the destination device
681 * @to: destination device
682 * @from: source device
683 *
684 * Remove all addresses that were added to the destination device by
685 * dev_mc_sync(). This function is intended to be called from the
686 * dev->stop function of layered software devices.
687 */
688void dev_mc_unsync(struct net_device *to, struct net_device *from)
689{
690 if (to->addr_len != from->addr_len)
691 return;
692
693 netif_addr_lock_bh(from);
694 netif_addr_lock_nested(to);
695 __hw_addr_unsync(&to->mc, &from->mc, to->addr_len);
696 __dev_set_rx_mode(to);
697 netif_addr_unlock(to);
698 netif_addr_unlock_bh(from);
699}
700EXPORT_SYMBOL(dev_mc_unsync);
701
702/**
703 * dev_mc_flush - Flush multicast addresses
704 * @dev: device
705 *
706 * Flush multicast addresses.
707 */
708void dev_mc_flush(struct net_device *dev)
709{
710 netif_addr_lock_bh(dev);
711 __hw_addr_flush(&dev->mc);
712 netif_addr_unlock_bh(dev);
713}
714EXPORT_SYMBOL(dev_mc_flush);
715
716/**
717 * dev_mc_flush - Init multicast address list
718 * @dev: device
719 *
720 * Init multicast address list.
721 */
722void dev_mc_init(struct net_device *dev)
723{
724 __hw_addr_init(&dev->mc);
725}
726EXPORT_SYMBOL(dev_mc_init);
727
728#ifdef CONFIG_PROC_FS
729#include <linux/seq_file.h>
730
731static int dev_mc_seq_show(struct seq_file *seq, void *v)
732{
733 struct netdev_hw_addr *ha;
734 struct net_device *dev = v;
735
736 if (v == SEQ_START_TOKEN)
737 return 0;
738
739 netif_addr_lock_bh(dev);
740 netdev_for_each_mc_addr(ha, dev) {
741 int i;
742
743 seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex,
744 dev->name, ha->refcount, ha->global_use);
745
746 for (i = 0; i < dev->addr_len; i++)
747 seq_printf(seq, "%02x", ha->addr[i]);
748
749 seq_putc(seq, '\n');
750 }
751 netif_addr_unlock_bh(dev);
752 return 0;
753}
754
755static const struct seq_operations dev_mc_seq_ops = {
756 .start = dev_seq_start,
757 .next = dev_seq_next,
758 .stop = dev_seq_stop,
759 .show = dev_mc_seq_show,
760};
761
762static int dev_mc_seq_open(struct inode *inode, struct file *file)
763{
764 return seq_open_net(inode, file, &dev_mc_seq_ops,
765 sizeof(struct seq_net_private));
766}
767
768static const struct file_operations dev_mc_seq_fops = {
769 .owner = THIS_MODULE,
770 .open = dev_mc_seq_open,
771 .read = seq_read,
772 .llseek = seq_lseek,
773 .release = seq_release_net,
774};
775
776#endif
777
778static int __net_init dev_mc_net_init(struct net *net)
779{
780 if (!proc_net_fops_create(net, "dev_mcast", 0, &dev_mc_seq_fops))
781 return -ENOMEM;
782 return 0;
783}
784
785static void __net_exit dev_mc_net_exit(struct net *net)
786{
787 proc_net_remove(net, "dev_mcast");
788}
789
790static struct pernet_operations __net_initdata dev_mc_net_ops = {
791 .init = dev_mc_net_init,
792 .exit = dev_mc_net_exit,
793};
794
795void __init dev_mcast_init(void)
796{
797 register_pernet_subsys(&dev_mc_net_ops);
798}
799