1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * net/core/dev_addr_lists.c - Functions for handling net device lists
4 * Copyright (c) 2010 Jiri Pirko <jpirko@redhat.com>
5 *
6 * This file contains functions for working with unicast, multicast and device
7 * addresses lists.
8 */
9
10 #include <linux/netdevice.h>
11 #include <linux/rtnetlink.h>
12 #include <linux/export.h>
13 #include <linux/list.h>
14
15 /*
16 * General list handling functions
17 */
18
19 static int __hw_addr_create_ex(struct netdev_hw_addr_list *list,
20 const unsigned char *addr, int addr_len,
21 unsigned char addr_type, bool global,
22 bool sync)
23 {
24 struct netdev_hw_addr *ha;
25 int alloc_size;
26
27 alloc_size = sizeof(*ha);
28 if (alloc_size < L1_CACHE_BYTES)
29 alloc_size = L1_CACHE_BYTES;
30 ha = kmalloc(alloc_size, GFP_ATOMIC);
31 if (!ha)
32 return -ENOMEM;
33 memcpy(ha->addr, addr, addr_len);
34 ha->type = addr_type;
35 ha->refcount = 1;
36 ha->global_use = global;
37 ha->synced = sync ? 1 : 0;
38 ha->sync_cnt = 0;
39 list_add_tail_rcu(&ha->list, &list->list);
40 list->count++;
41
42 return 0;
43 }
44
45 static int __hw_addr_add_ex(struct netdev_hw_addr_list *list,
46 const unsigned char *addr, int addr_len,
47 unsigned char addr_type, bool global, bool sync,
48 int sync_count)
49 {
50 struct netdev_hw_addr *ha;
51
52 if (addr_len > MAX_ADDR_LEN)
53 return -EINVAL;
54
55 list_for_each_entry(ha, &list->list, list) {
56 if (ha->type == addr_type &&
57 !memcmp(ha->addr, addr, addr_len)) {
58 if (global) {
59 /* check if addr is already used as global */
60 if (ha->global_use)
61 return 0;
62 else
63 ha->global_use = true;
64 }
65 if (sync) {
66 if (ha->synced && sync_count)
67 return -EEXIST;
68 else
69 ha->synced++;
70 }
71 ha->refcount++;
72 return 0;
73 }
74 }
75
76 return __hw_addr_create_ex(list, addr, addr_len, addr_type, global,
77 sync);
78 }
79
80 static int __hw_addr_add(struct netdev_hw_addr_list *list,
81 const unsigned char *addr, int addr_len,
82 unsigned char addr_type)
83 {
84 return __hw_addr_add_ex(list, addr, addr_len, addr_type, false, false,
85 0);
86 }
87
88 static int __hw_addr_del_entry(struct netdev_hw_addr_list *list,
89 struct netdev_hw_addr *ha, bool global,
90 bool sync)
91 {
92 if (global && !ha->global_use)
93 return -ENOENT;
94
95 if (sync && !ha->synced)
96 return -ENOENT;
97
98 if (global)
99 ha->global_use = false;
100
101 if (sync)
102 ha->synced--;
103
104 if (--ha->refcount)
105 return 0;
106 list_del_rcu(&ha->list);
107 kfree_rcu(ha, rcu_head);
108 list->count--;
109 return 0;
110 }
111
112 static int __hw_addr_del_ex(struct netdev_hw_addr_list *list,
113 const unsigned char *addr, int addr_len,
114 unsigned char addr_type, bool global, bool sync)
115 {
116 struct netdev_hw_addr *ha;
117
118 list_for_each_entry(ha, &list->list, list) {
119 if (!memcmp(ha->addr, addr, addr_len) &&
120 (ha->type == addr_type || !addr_type))
121 return __hw_addr_del_entry(list, ha, global, sync);
122 }
123 return -ENOENT;
124 }
125
126 static int __hw_addr_del(struct netdev_hw_addr_list *list,
127 const unsigned char *addr, int addr_len,
128 unsigned char addr_type)
129 {
130 return __hw_addr_del_ex(list, addr, addr_len, addr_type, false, false);
131 }
132
133 static int __hw_addr_sync_one(struct netdev_hw_addr_list *to_list,
134 struct netdev_hw_addr *ha,
135 int addr_len)
136 {
137 int err;
138
139 err = __hw_addr_add_ex(to_list, ha->addr, addr_len, ha->type,
140 false, true, ha->sync_cnt);
141 if (err && err != -EEXIST)
142 return err;
143
144 if (!err) {
145 ha->sync_cnt++;
146 ha->refcount++;
147 }
148
149 return 0;
150 }
151
152 static void __hw_addr_unsync_one(struct netdev_hw_addr_list *to_list,
153 struct netdev_hw_addr_list *from_list,
154 struct netdev_hw_addr *ha,
155 int addr_len)
156 {
157 int err;
158
159 err = __hw_addr_del_ex(to_list, ha->addr, addr_len, ha->type,
160 false, true);
161 if (err)
162 return;
163 ha->sync_cnt--;
164 /* address on from list is not marked synced */
165 __hw_addr_del_entry(from_list, ha, false, false);
166 }
167
168 static int __hw_addr_sync_multiple(struct netdev_hw_addr_list *to_list,
169 struct netdev_hw_addr_list *from_list,
170 int addr_len)
171 {
172 int err = 0;
173 struct netdev_hw_addr *ha, *tmp;
174
175 list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
176 if (ha->sync_cnt == ha->refcount) {
177 __hw_addr_unsync_one(to_list, from_list, ha, addr_len);
178 } else {
179 err = __hw_addr_sync_one(to_list, ha, addr_len);
180 if (err)
181 break;
182 }
183 }
184 return err;
185 }
186
187 /* This function only works where there is a strict 1-1 relationship
188 * between source and destionation of they synch. If you ever need to
189 * sync addresses to more then 1 destination, you need to use
190 * __hw_addr_sync_multiple().
191 */
192 int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
193 struct netdev_hw_addr_list *from_list,
194 int addr_len)
195 {
196 int err = 0;
197 struct netdev_hw_addr *ha, *tmp;
198
199 list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
200 if (!ha->sync_cnt) {
201 err = __hw_addr_sync_one(to_list, ha, addr_len);
202 if (err)
203 break;
204 } else if (ha->refcount == 1)
205 __hw_addr_unsync_one(to_list, from_list, ha, addr_len);
206 }
207 return err;
208 }
209 EXPORT_SYMBOL(__hw_addr_sync);
210
211 void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
212 struct netdev_hw_addr_list *from_list,
213 int addr_len)
214 {
215 struct netdev_hw_addr *ha, *tmp;
216
217 list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
218 if (ha->sync_cnt)
219 __hw_addr_unsync_one(to_list, from_list, ha, addr_len);
220 }
221 }
222 EXPORT_SYMBOL(__hw_addr_unsync);
223
224 /**
225 * __hw_addr_sync_dev - Synchonize device's multicast list
226 * @list: address list to syncronize
227 * @dev: device to sync
228 * @sync: function to call if address should be added
229 * @unsync: function to call if address should be removed
230 *
231 * This funciton is intended to be called from the ndo_set_rx_mode
232 * function of devices that require explicit address add/remove
233 * notifications. The unsync function may be NULL in which case
234 * the addresses requiring removal will simply be removed without
235 * any notification to the device.
236 **/
237 int __hw_addr_sync_dev(struct netdev_hw_addr_list *list,
238 struct net_device *dev,
239 int (*sync)(struct net_device *, const unsigned char *),
240 int (*unsync)(struct net_device *,
241 const unsigned char *))
242 {
243 struct netdev_hw_addr *ha, *tmp;
244 int err;
245
246 /* first go through and flush out any stale entries */
247 list_for_each_entry_safe(ha, tmp, &list->list, list) {
248 if (!ha->sync_cnt || ha->refcount != 1)
249 continue;
250
251 /* if unsync is defined and fails defer unsyncing address */
252 if (unsync && unsync(dev, ha->addr))
253 continue;
254
255 ha->sync_cnt--;
256 __hw_addr_del_entry(list, ha, false, false);
257 }
258
259 /* go through and sync new entries to the list */
260 list_for_each_entry_safe(ha, tmp, &list->list, list) {
261 if (ha->sync_cnt)
262 continue;
263
264 err = sync(dev, ha->addr);
265 if (err)
266 return err;
267
268 ha->sync_cnt++;
269 ha->refcount++;
270 }
271
272 return 0;
273 }
274 EXPORT_SYMBOL(__hw_addr_sync_dev);
275
276 /**
277 * __hw_addr_ref_sync_dev - Synchronize device's multicast address list taking
278 * into account references
279 * @list: address list to synchronize
280 * @dev: device to sync
281 * @sync: function to call if address or reference on it should be added
282 * @unsync: function to call if address or some reference on it should removed
283 *
284 * This function is intended to be called from the ndo_set_rx_mode
285 * function of devices that require explicit address or references on it
286 * add/remove notifications. The unsync function may be NULL in which case
287 * the addresses or references on it requiring removal will simply be
288 * removed without any notification to the device. That is responsibility of
289 * the driver to identify and distribute address or references on it between
290 * internal address tables.
291 **/
292 int __hw_addr_ref_sync_dev(struct netdev_hw_addr_list *list,
293 struct net_device *dev,
294 int (*sync)(struct net_device *,
295 const unsigned char *, int),
296 int (*unsync)(struct net_device *,
297 const unsigned char *, int))
298 {
299 struct netdev_hw_addr *ha, *tmp;
300 int err, ref_cnt;
301
302 /* first go through and flush out any unsynced/stale entries */
303 list_for_each_entry_safe(ha, tmp, &list->list, list) {
304 /* sync if address is not used */
305 if ((ha->sync_cnt << 1) <= ha->refcount)
306 continue;
307
308 /* if fails defer unsyncing address */
309 ref_cnt = ha->refcount - ha->sync_cnt;
310 if (unsync && unsync(dev, ha->addr, ref_cnt))
311 continue;
312
313 ha->refcount = (ref_cnt << 1) + 1;
314 ha->sync_cnt = ref_cnt;
315 __hw_addr_del_entry(list, ha, false, false);
316 }
317
318 /* go through and sync updated/new entries to the list */
319 list_for_each_entry_safe(ha, tmp, &list->list, list) {
320 /* sync if address added or reused */
321 if ((ha->sync_cnt << 1) >= ha->refcount)
322 continue;
323
324 ref_cnt = ha->refcount - ha->sync_cnt;
325 err = sync(dev, ha->addr, ref_cnt);
326 if (err)
327 return err;
328
329 ha->refcount = ref_cnt << 1;
330 ha->sync_cnt = ref_cnt;
331 }
332
333 return 0;
334 }
335 EXPORT_SYMBOL(__hw_addr_ref_sync_dev);
336
337 /**
338 * __hw_addr_ref_unsync_dev - Remove synchronized addresses and references on
339 * it from device
340 * @list: address list to remove synchronized addresses (references on it) from
341 * @dev: device to sync
342 * @unsync: function to call if address and references on it should be removed
343 *
344 * Remove all addresses that were added to the device by
345 * __hw_addr_ref_sync_dev(). This function is intended to be called from the
346 * ndo_stop or ndo_open functions on devices that require explicit address (or
347 * references on it) add/remove notifications. If the unsync function pointer
348 * is NULL then this function can be used to just reset the sync_cnt for the
349 * addresses in the list.
350 **/
351 void __hw_addr_ref_unsync_dev(struct netdev_hw_addr_list *list,
352 struct net_device *dev,
353 int (*unsync)(struct net_device *,
354 const unsigned char *, int))
355 {
356 struct netdev_hw_addr *ha, *tmp;
357
358 list_for_each_entry_safe(ha, tmp, &list->list, list) {
359 if (!ha->sync_cnt)
360 continue;
361
362 /* if fails defer unsyncing address */
363 if (unsync && unsync(dev, ha->addr, ha->sync_cnt))
364 continue;
365
366 ha->refcount -= ha->sync_cnt - 1;
367 ha->sync_cnt = 0;
368 __hw_addr_del_entry(list, ha, false, false);
369 }
370 }
371 EXPORT_SYMBOL(__hw_addr_ref_unsync_dev);
372
373 /**
374 * __hw_addr_unsync_dev - Remove synchronized addresses from device
375 * @list: address list to remove synchronized addresses from
376 * @dev: device to sync
377 * @unsync: function to call if address should be removed
378 *
379 * Remove all addresses that were added to the device by __hw_addr_sync_dev().
380 * This function is intended to be called from the ndo_stop or ndo_open
381 * functions on devices that require explicit address add/remove
382 * notifications. If the unsync function pointer is NULL then this function
383 * can be used to just reset the sync_cnt for the addresses in the list.
384 **/
385 void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list,
386 struct net_device *dev,
387 int (*unsync)(struct net_device *,
388 const unsigned char *))
389 {
390 struct netdev_hw_addr *ha, *tmp;
391
392 list_for_each_entry_safe(ha, tmp, &list->list, list) {
393 if (!ha->sync_cnt)
394 continue;
395
396 /* if unsync is defined and fails defer unsyncing address */
397 if (unsync && unsync(dev, ha->addr))
398 continue;
399
400 ha->sync_cnt--;
401 __hw_addr_del_entry(list, ha, false, false);
402 }
403 }
404 EXPORT_SYMBOL(__hw_addr_unsync_dev);
405
406 static void __hw_addr_flush(struct netdev_hw_addr_list *list)
407 {
408 struct netdev_hw_addr *ha, *tmp;
409
410 list_for_each_entry_safe(ha, tmp, &list->list, list) {
411 list_del_rcu(&ha->list);
412 kfree_rcu(ha, rcu_head);
413 }
414 list->count = 0;
415 }
416
417 void __hw_addr_init(struct netdev_hw_addr_list *list)
418 {
419 INIT_LIST_HEAD(&list->list);
420 list->count = 0;
421 }
422 EXPORT_SYMBOL(__hw_addr_init);
423
424 /*
425 * Device addresses handling functions
426 */
427
428 /**
429 * dev_addr_flush - Flush device address list
430 * @dev: device
431 *
432 * Flush device address list and reset ->dev_addr.
433 *
434 * The caller must hold the rtnl_mutex.
435 */
436 void dev_addr_flush(struct net_device *dev)
437 {
438 /* rtnl_mutex must be held here */
439
440 __hw_addr_flush(&dev->dev_addrs);
441 dev->dev_addr = NULL;
442 }
443 EXPORT_SYMBOL(dev_addr_flush);
444
445 /**
446 * dev_addr_init - Init device address list
447 * @dev: device
448 *
449 * Init device address list and create the first element,
450 * used by ->dev_addr.
451 *
452 * The caller must hold the rtnl_mutex.
453 */
454 int dev_addr_init(struct net_device *dev)
455 {
456 unsigned char addr[MAX_ADDR_LEN];
457 struct netdev_hw_addr *ha;
458 int err;
459
460 /* rtnl_mutex must be held here */
461
462 __hw_addr_init(&dev->dev_addrs);
463 memset(addr, 0, sizeof(addr));
464 err = __hw_addr_add(&dev->dev_addrs, addr, sizeof(addr),
465 NETDEV_HW_ADDR_T_LAN);
466 if (!err) {
467 /*
468 * Get the first (previously created) address from the list
469 * and set dev_addr pointer to this location.
470 */
471 ha = list_first_entry(&dev->dev_addrs.list,
472 struct netdev_hw_addr, list);
473 dev->dev_addr = ha->addr;
474 }
475 return err;
476 }
477 EXPORT_SYMBOL(dev_addr_init);
478
479 /**
480 * dev_addr_add - Add a device address
481 * @dev: device
482 * @addr: address to add
483 * @addr_type: address type
484 *
485 * Add a device address to the device or increase the reference count if
486 * it already exists.
487 *
488 * The caller must hold the rtnl_mutex.
489 */
490 int dev_addr_add(struct net_device *dev, const unsigned char *addr,
491 unsigned char addr_type)
492 {
493 int err;
494
495 ASSERT_RTNL();
496
497 err = dev_pre_changeaddr_notify(dev, addr, NULL);
498 if (err)
499 return err;
500 err = __hw_addr_add(&dev->dev_addrs, addr, dev->addr_len, addr_type);
501 if (!err)
502 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
503 return err;
504 }
505 EXPORT_SYMBOL(dev_addr_add);
506
507 /**
508 * dev_addr_del - Release a device address.
509 * @dev: device
510 * @addr: address to delete
511 * @addr_type: address type
512 *
513 * Release reference to a device address and remove it from the device
514 * if the reference count drops to zero.
515 *
516 * The caller must hold the rtnl_mutex.
517 */
518 int dev_addr_del(struct net_device *dev, const unsigned char *addr,
519 unsigned char addr_type)
520 {
521 int err;
522 struct netdev_hw_addr *ha;
523
524 ASSERT_RTNL();
525
526 /*
527 * We can not remove the first address from the list because
528 * dev->dev_addr points to that.
529 */
530 ha = list_first_entry(&dev->dev_addrs.list,
531 struct netdev_hw_addr, list);
532 if (!memcmp(ha->addr, addr, dev->addr_len) &&
533 ha->type == addr_type && ha->refcount == 1)
534 return -ENOENT;
535
536 err = __hw_addr_del(&dev->dev_addrs, addr, dev->addr_len,
537 addr_type);
538 if (!err)
539 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
540 return err;
541 }
542 EXPORT_SYMBOL(dev_addr_del);
543
544 /*
545 * Unicast list handling functions
546 */
547
548 /**
549 * dev_uc_add_excl - Add a global secondary unicast address
550 * @dev: device
551 * @addr: address to add
552 */
553 int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr)
554 {
555 struct netdev_hw_addr *ha;
556 int err;
557
558 netif_addr_lock_bh(dev);
559 list_for_each_entry(ha, &dev->uc.list, list) {
560 if (!memcmp(ha->addr, addr, dev->addr_len) &&
561 ha->type == NETDEV_HW_ADDR_T_UNICAST) {
562 err = -EEXIST;
563 goto out;
564 }
565 }
566 err = __hw_addr_create_ex(&dev->uc, addr, dev->addr_len,
567 NETDEV_HW_ADDR_T_UNICAST, true, false);
568 if (!err)
569 __dev_set_rx_mode(dev);
570 out:
571 netif_addr_unlock_bh(dev);
572 return err;
573 }
574 EXPORT_SYMBOL(dev_uc_add_excl);
575
576 /**
577 * dev_uc_add - Add a secondary unicast address
578 * @dev: device
579 * @addr: address to add
580 *
581 * Add a secondary unicast address to the device or increase
582 * the reference count if it already exists.
583 */
584 int dev_uc_add(struct net_device *dev, const unsigned char *addr)
585 {
586 int err;
587
588 netif_addr_lock_bh(dev);
589 err = __hw_addr_add(&dev->uc, addr, dev->addr_len,
590 NETDEV_HW_ADDR_T_UNICAST);
591 if (!err)
592 __dev_set_rx_mode(dev);
593 netif_addr_unlock_bh(dev);
594 return err;
595 }
596 EXPORT_SYMBOL(dev_uc_add);
597
598 /**
599 * dev_uc_del - Release secondary unicast address.
600 * @dev: device
601 * @addr: address to delete
602 *
603 * Release reference to a secondary unicast address and remove it
604 * from the device if the reference count drops to zero.
605 */
606 int dev_uc_del(struct net_device *dev, const unsigned char *addr)
607 {
608 int err;
609
610 netif_addr_lock_bh(dev);
611 err = __hw_addr_del(&dev->uc, addr, dev->addr_len,
612 NETDEV_HW_ADDR_T_UNICAST);
613 if (!err)
614 __dev_set_rx_mode(dev);
615 netif_addr_unlock_bh(dev);
616 return err;
617 }
618 EXPORT_SYMBOL(dev_uc_del);
619
620 /**
621 * dev_uc_sync - Synchronize device's unicast list to another device
622 * @to: destination device
623 * @from: source device
624 *
625 * Add newly added addresses to the destination device and release
626 * addresses that have no users left. The source device must be
627 * locked by netif_addr_lock_bh.
628 *
629 * This function is intended to be called from the dev->set_rx_mode
630 * function of layered software devices. This function assumes that
631 * addresses will only ever be synced to the @to devices and no other.
632 */
633 int dev_uc_sync(struct net_device *to, struct net_device *from)
634 {
635 int err = 0;
636
637 if (to->addr_len != from->addr_len)
638 return -EINVAL;
639
640 netif_addr_lock(to);
641 err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len);
642 if (!err)
643 __dev_set_rx_mode(to);
644 netif_addr_unlock(to);
645 return err;
646 }
647 EXPORT_SYMBOL(dev_uc_sync);
648
649 /**
650 * dev_uc_sync_multiple - Synchronize device's unicast list to another
651 * device, but allow for multiple calls to sync to multiple devices.
652 * @to: destination device
653 * @from: source device
654 *
655 * Add newly added addresses to the destination device and release
656 * addresses that have been deleted from the source. The source device
657 * must be locked by netif_addr_lock_bh.
658 *
659 * This function is intended to be called from the dev->set_rx_mode
660 * function of layered software devices. It allows for a single source
661 * device to be synced to multiple destination devices.
662 */
663 int dev_uc_sync_multiple(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(to);
671 err = __hw_addr_sync_multiple(&to->uc, &from->uc, to->addr_len);
672 if (!err)
673 __dev_set_rx_mode(to);
674 netif_addr_unlock(to);
675 return err;
676 }
677 EXPORT_SYMBOL(dev_uc_sync_multiple);
678
679 /**
680 * dev_uc_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_uc_sync(). This function is intended to be called from the
686 * dev->stop function of layered software devices.
687 */
688 void dev_uc_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() uses lockdep subclass 0, this is okay for two
694 * reasons:
695 * 1) This is always called without any addr_list_lock, so as the
696 * outermost one here, it must be 0.
697 * 2) This is called by some callers after unlinking the upper device,
698 * so the dev->lower_level becomes 1 again.
699 * Therefore, the subclass for 'from' is 0, for 'to' is either 1 or
700 * larger.
701 */
702 netif_addr_lock_bh(from);
703 netif_addr_lock(to);
704 __hw_addr_unsync(&to->uc, &from->uc, to->addr_len);
705 __dev_set_rx_mode(to);
706 netif_addr_unlock(to);
707 netif_addr_unlock_bh(from);
708 }
709 EXPORT_SYMBOL(dev_uc_unsync);
710
711 /**
712 * dev_uc_flush - Flush unicast addresses
713 * @dev: device
714 *
715 * Flush unicast addresses.
716 */
717 void dev_uc_flush(struct net_device *dev)
718 {
719 netif_addr_lock_bh(dev);
720 __hw_addr_flush(&dev->uc);
721 netif_addr_unlock_bh(dev);
722 }
723 EXPORT_SYMBOL(dev_uc_flush);
724
725 /**
726 * dev_uc_flush - Init unicast address list
727 * @dev: device
728 *
729 * Init unicast address list.
730 */
731 void dev_uc_init(struct net_device *dev)
732 {
733 __hw_addr_init(&dev->uc);
734 }
735 EXPORT_SYMBOL(dev_uc_init);
736
737 /*
738 * Multicast list handling functions
739 */
740
741 /**
742 * dev_mc_add_excl - Add a global secondary multicast address
743 * @dev: device
744 * @addr: address to add
745 */
746 int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr)
747 {
748 struct netdev_hw_addr *ha;
749 int err;
750
751 netif_addr_lock_bh(dev);
752 list_for_each_entry(ha, &dev->mc.list, list) {
753 if (!memcmp(ha->addr, addr, dev->addr_len) &&
754 ha->type == NETDEV_HW_ADDR_T_MULTICAST) {
755 err = -EEXIST;
756 goto out;
757 }
758 }
759 err = __hw_addr_create_ex(&dev->mc, addr, dev->addr_len,
760 NETDEV_HW_ADDR_T_MULTICAST, true, false);
761 if (!err)
762 __dev_set_rx_mode(dev);
763 out:
764 netif_addr_unlock_bh(dev);
765 return err;
766 }
767 EXPORT_SYMBOL(dev_mc_add_excl);
768
769 static int __dev_mc_add(struct net_device *dev, const unsigned char *addr,
770 bool global)
771 {
772 int err;
773
774 netif_addr_lock_bh(dev);
775 err = __hw_addr_add_ex(&dev->mc, addr, dev->addr_len,
776 NETDEV_HW_ADDR_T_MULTICAST, global, false, 0);
777 if (!err)
778 __dev_set_rx_mode(dev);
779 netif_addr_unlock_bh(dev);
780 return err;
781 }
782 /**
783 * dev_mc_add - Add a multicast address
784 * @dev: device
785 * @addr: address to add
786 *
787 * Add a multicast address to the device or increase
788 * the reference count if it already exists.
789 */
790 int dev_mc_add(struct net_device *dev, const unsigned char *addr)
791 {
792 return __dev_mc_add(dev, addr, false);
793 }
794 EXPORT_SYMBOL(dev_mc_add);
795
796 /**
797 * dev_mc_add_global - Add a global multicast address
798 * @dev: device
799 * @addr: address to add
800 *
801 * Add a global multicast address to the device.
802 */
803 int dev_mc_add_global(struct net_device *dev, const unsigned char *addr)
804 {
805 return __dev_mc_add(dev, addr, true);
806 }
807 EXPORT_SYMBOL(dev_mc_add_global);
808
809 static int __dev_mc_del(struct net_device *dev, const unsigned char *addr,
810 bool global)
811 {
812 int err;
813
814 netif_addr_lock_bh(dev);
815 err = __hw_addr_del_ex(&dev->mc, addr, dev->addr_len,
816 NETDEV_HW_ADDR_T_MULTICAST, global, false);
817 if (!err)
818 __dev_set_rx_mode(dev);
819 netif_addr_unlock_bh(dev);
820 return err;
821 }
822
823 /**
824 * dev_mc_del - Delete a multicast address.
825 * @dev: device
826 * @addr: address to delete
827 *
828 * Release reference to a multicast address and remove it
829 * from the device if the reference count drops to zero.
830 */
831 int dev_mc_del(struct net_device *dev, const unsigned char *addr)
832 {
833 return __dev_mc_del(dev, addr, false);
834 }
835 EXPORT_SYMBOL(dev_mc_del);
836
837 /**
838 * dev_mc_del_global - Delete a global multicast address.
839 * @dev: device
840 * @addr: address to delete
841 *
842 * Release reference to a multicast address and remove it
843 * from the device if the reference count drops to zero.
844 */
845 int dev_mc_del_global(struct net_device *dev, const unsigned char *addr)
846 {
847 return __dev_mc_del(dev, addr, true);
848 }
849 EXPORT_SYMBOL(dev_mc_del_global);
850
851 /**
852 * dev_mc_sync - Synchronize device's multicast list to another device
853 * @to: destination device
854 * @from: source device
855 *
856 * Add newly added addresses to the destination device and release
857 * addresses that have no users left. The source device must be
858 * locked by netif_addr_lock_bh.
859 *
860 * This function is intended to be called from the ndo_set_rx_mode
861 * function of layered software devices.
862 */
863 int dev_mc_sync(struct net_device *to, struct net_device *from)
864 {
865 int err = 0;
866
867 if (to->addr_len != from->addr_len)
868 return -EINVAL;
869
870 netif_addr_lock(to);
871 err = __hw_addr_sync(&to->mc, &from->mc, to->addr_len);
872 if (!err)
873 __dev_set_rx_mode(to);
874 netif_addr_unlock(to);
875 return err;
876 }
877 EXPORT_SYMBOL(dev_mc_sync);
878
879 /**
880 * dev_mc_sync_multiple - Synchronize device's multicast list to another
881 * device, but allow for multiple calls to sync to multiple devices.
882 * @to: destination device
883 * @from: source device
884 *
885 * Add newly added addresses to the destination device and release
886 * addresses that have no users left. The source device must be
887 * locked by netif_addr_lock_bh.
888 *
889 * This function is intended to be called from the ndo_set_rx_mode
890 * function of layered software devices. It allows for a single
891 * source device to be synced to multiple destination devices.
892 */
893 int dev_mc_sync_multiple(struct net_device *to, struct net_device *from)
894 {
895 int err = 0;
896
897 if (to->addr_len != from->addr_len)
898 return -EINVAL;
899
900 netif_addr_lock(to);
901 err = __hw_addr_sync_multiple(&to->mc, &from->mc, to->addr_len);
902 if (!err)
903 __dev_set_rx_mode(to);
904 netif_addr_unlock(to);
905 return err;
906 }
907 EXPORT_SYMBOL(dev_mc_sync_multiple);
908
909 /**
910 * dev_mc_unsync - Remove synchronized addresses from the destination device
911 * @to: destination device
912 * @from: source device
913 *
914 * Remove all addresses that were added to the destination device by
915 * dev_mc_sync(). This function is intended to be called from the
916 * dev->stop function of layered software devices.
917 */
918 void dev_mc_unsync(struct net_device *to, struct net_device *from)
919 {
920 if (to->addr_len != from->addr_len)
921 return;
922
923 /* See the above comments inside dev_uc_unsync(). */
924 netif_addr_lock_bh(from);
925 netif_addr_lock(to);
926 __hw_addr_unsync(&to->mc, &from->mc, to->addr_len);
927 __dev_set_rx_mode(to);
928 netif_addr_unlock(to);
929 netif_addr_unlock_bh(from);
930 }
931 EXPORT_SYMBOL(dev_mc_unsync);
932
933 /**
934 * dev_mc_flush - Flush multicast addresses
935 * @dev: device
936 *
937 * Flush multicast addresses.
938 */
939 void dev_mc_flush(struct net_device *dev)
940 {
941 netif_addr_lock_bh(dev);
942 __hw_addr_flush(&dev->mc);
943 netif_addr_unlock_bh(dev);
944 }
945 EXPORT_SYMBOL(dev_mc_flush);
946
947 /**
948 * dev_mc_init - Init multicast address list
949 * @dev: device
950 *
951 * Init multicast address list.
952 */
953 void dev_mc_init(struct net_device *dev)
954 {
955 __hw_addr_init(&dev->mc);
956 }
957 EXPORT_SYMBOL(dev_mc_init);
958
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