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a748ee24 JP |
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/list.h> | |
17 | ||
18 | /* | |
19 | * General list handling functions | |
20 | */ | |
21 | ||
22bedad3 JP |
22 | static int __hw_addr_add_ex(struct netdev_hw_addr_list *list, |
23 | unsigned char *addr, int addr_len, | |
24 | unsigned char addr_type, bool global) | |
a748ee24 JP |
25 | { |
26 | struct netdev_hw_addr *ha; | |
27 | int alloc_size; | |
28 | ||
29 | if (addr_len > MAX_ADDR_LEN) | |
30 | return -EINVAL; | |
31 | ||
32 | list_for_each_entry(ha, &list->list, list) { | |
33 | if (!memcmp(ha->addr, addr, addr_len) && | |
34 | ha->type == addr_type) { | |
22bedad3 JP |
35 | if (global) { |
36 | /* check if addr is already used as global */ | |
37 | if (ha->global_use) | |
38 | return 0; | |
39 | else | |
40 | ha->global_use = true; | |
41 | } | |
a748ee24 JP |
42 | ha->refcount++; |
43 | return 0; | |
44 | } | |
45 | } | |
46 | ||
47 | ||
48 | alloc_size = sizeof(*ha); | |
49 | if (alloc_size < L1_CACHE_BYTES) | |
50 | alloc_size = L1_CACHE_BYTES; | |
51 | ha = kmalloc(alloc_size, GFP_ATOMIC); | |
52 | if (!ha) | |
53 | return -ENOMEM; | |
54 | memcpy(ha->addr, addr, addr_len); | |
55 | ha->type = addr_type; | |
56 | ha->refcount = 1; | |
22bedad3 | 57 | ha->global_use = global; |
a748ee24 JP |
58 | ha->synced = false; |
59 | list_add_tail_rcu(&ha->list, &list->list); | |
60 | list->count++; | |
61 | return 0; | |
62 | } | |
63 | ||
22bedad3 JP |
64 | static int __hw_addr_add(struct netdev_hw_addr_list *list, unsigned char *addr, |
65 | int addr_len, unsigned char addr_type) | |
66 | { | |
67 | return __hw_addr_add_ex(list, addr, addr_len, addr_type, false); | |
68 | } | |
69 | ||
a748ee24 JP |
70 | static void ha_rcu_free(struct rcu_head *head) |
71 | { | |
72 | struct netdev_hw_addr *ha; | |
73 | ||
74 | ha = container_of(head, struct netdev_hw_addr, rcu_head); | |
75 | kfree(ha); | |
76 | } | |
77 | ||
22bedad3 JP |
78 | static int __hw_addr_del_ex(struct netdev_hw_addr_list *list, |
79 | unsigned char *addr, int addr_len, | |
80 | unsigned char addr_type, bool global) | |
a748ee24 JP |
81 | { |
82 | struct netdev_hw_addr *ha; | |
83 | ||
84 | list_for_each_entry(ha, &list->list, list) { | |
85 | if (!memcmp(ha->addr, addr, addr_len) && | |
86 | (ha->type == addr_type || !addr_type)) { | |
22bedad3 JP |
87 | if (global) { |
88 | if (!ha->global_use) | |
89 | break; | |
90 | else | |
91 | ha->global_use = false; | |
92 | } | |
a748ee24 JP |
93 | if (--ha->refcount) |
94 | return 0; | |
95 | list_del_rcu(&ha->list); | |
96 | call_rcu(&ha->rcu_head, ha_rcu_free); | |
97 | list->count--; | |
98 | return 0; | |
99 | } | |
100 | } | |
101 | return -ENOENT; | |
102 | } | |
103 | ||
22bedad3 JP |
104 | static int __hw_addr_del(struct netdev_hw_addr_list *list, unsigned char *addr, |
105 | int addr_len, unsigned char addr_type) | |
106 | { | |
107 | return __hw_addr_del_ex(list, addr, addr_len, addr_type, false); | |
108 | } | |
109 | ||
110 | int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list, | |
111 | struct netdev_hw_addr_list *from_list, | |
112 | int addr_len, unsigned char addr_type) | |
a748ee24 JP |
113 | { |
114 | int err; | |
115 | struct netdev_hw_addr *ha, *ha2; | |
116 | unsigned char type; | |
117 | ||
118 | list_for_each_entry(ha, &from_list->list, list) { | |
119 | type = addr_type ? addr_type : ha->type; | |
120 | err = __hw_addr_add(to_list, ha->addr, addr_len, type); | |
121 | if (err) | |
122 | goto unroll; | |
123 | } | |
124 | return 0; | |
125 | ||
126 | unroll: | |
127 | list_for_each_entry(ha2, &from_list->list, list) { | |
128 | if (ha2 == ha) | |
129 | break; | |
130 | type = addr_type ? addr_type : ha2->type; | |
131 | __hw_addr_del(to_list, ha2->addr, addr_len, type); | |
132 | } | |
133 | return err; | |
134 | } | |
22bedad3 | 135 | EXPORT_SYMBOL(__hw_addr_add_multiple); |
a748ee24 | 136 | |
22bedad3 JP |
137 | void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list, |
138 | struct netdev_hw_addr_list *from_list, | |
139 | int addr_len, unsigned char addr_type) | |
a748ee24 JP |
140 | { |
141 | struct netdev_hw_addr *ha; | |
142 | unsigned char type; | |
143 | ||
144 | list_for_each_entry(ha, &from_list->list, list) { | |
145 | type = addr_type ? addr_type : ha->type; | |
146 | __hw_addr_del(to_list, ha->addr, addr_len, addr_type); | |
147 | } | |
148 | } | |
22bedad3 | 149 | EXPORT_SYMBOL(__hw_addr_del_multiple); |
a748ee24 | 150 | |
22bedad3 JP |
151 | int __hw_addr_sync(struct netdev_hw_addr_list *to_list, |
152 | struct netdev_hw_addr_list *from_list, | |
153 | int addr_len) | |
a748ee24 JP |
154 | { |
155 | int err = 0; | |
156 | struct netdev_hw_addr *ha, *tmp; | |
157 | ||
158 | list_for_each_entry_safe(ha, tmp, &from_list->list, list) { | |
159 | if (!ha->synced) { | |
160 | err = __hw_addr_add(to_list, ha->addr, | |
161 | addr_len, ha->type); | |
162 | if (err) | |
163 | break; | |
164 | ha->synced = true; | |
165 | ha->refcount++; | |
166 | } else if (ha->refcount == 1) { | |
167 | __hw_addr_del(to_list, ha->addr, addr_len, ha->type); | |
168 | __hw_addr_del(from_list, ha->addr, addr_len, ha->type); | |
169 | } | |
170 | } | |
171 | return err; | |
172 | } | |
22bedad3 | 173 | EXPORT_SYMBOL(__hw_addr_sync); |
a748ee24 | 174 | |
22bedad3 JP |
175 | void __hw_addr_unsync(struct netdev_hw_addr_list *to_list, |
176 | struct netdev_hw_addr_list *from_list, | |
177 | int addr_len) | |
a748ee24 JP |
178 | { |
179 | struct netdev_hw_addr *ha, *tmp; | |
180 | ||
181 | list_for_each_entry_safe(ha, tmp, &from_list->list, list) { | |
182 | if (ha->synced) { | |
183 | __hw_addr_del(to_list, ha->addr, | |
184 | addr_len, ha->type); | |
185 | ha->synced = false; | |
186 | __hw_addr_del(from_list, ha->addr, | |
187 | addr_len, ha->type); | |
188 | } | |
189 | } | |
190 | } | |
22bedad3 | 191 | EXPORT_SYMBOL(__hw_addr_unsync); |
a748ee24 | 192 | |
22bedad3 | 193 | void __hw_addr_flush(struct netdev_hw_addr_list *list) |
a748ee24 JP |
194 | { |
195 | struct netdev_hw_addr *ha, *tmp; | |
196 | ||
197 | list_for_each_entry_safe(ha, tmp, &list->list, list) { | |
198 | list_del_rcu(&ha->list); | |
199 | call_rcu(&ha->rcu_head, ha_rcu_free); | |
200 | } | |
201 | list->count = 0; | |
202 | } | |
22bedad3 | 203 | EXPORT_SYMBOL(__hw_addr_flush); |
a748ee24 | 204 | |
22bedad3 | 205 | void __hw_addr_init(struct netdev_hw_addr_list *list) |
a748ee24 JP |
206 | { |
207 | INIT_LIST_HEAD(&list->list); | |
208 | list->count = 0; | |
209 | } | |
22bedad3 | 210 | EXPORT_SYMBOL(__hw_addr_init); |
a748ee24 JP |
211 | |
212 | /* | |
213 | * Device addresses handling functions | |
214 | */ | |
215 | ||
216 | /** | |
217 | * dev_addr_flush - Flush device address list | |
218 | * @dev: device | |
219 | * | |
220 | * Flush device address list and reset ->dev_addr. | |
221 | * | |
222 | * The caller must hold the rtnl_mutex. | |
223 | */ | |
224 | void dev_addr_flush(struct net_device *dev) | |
225 | { | |
226 | /* rtnl_mutex must be held here */ | |
227 | ||
228 | __hw_addr_flush(&dev->dev_addrs); | |
229 | dev->dev_addr = NULL; | |
230 | } | |
231 | EXPORT_SYMBOL(dev_addr_flush); | |
232 | ||
233 | /** | |
234 | * dev_addr_init - Init device address list | |
235 | * @dev: device | |
236 | * | |
237 | * Init device address list and create the first element, | |
238 | * used by ->dev_addr. | |
239 | * | |
240 | * The caller must hold the rtnl_mutex. | |
241 | */ | |
242 | int dev_addr_init(struct net_device *dev) | |
243 | { | |
244 | unsigned char addr[MAX_ADDR_LEN]; | |
245 | struct netdev_hw_addr *ha; | |
246 | int err; | |
247 | ||
248 | /* rtnl_mutex must be held here */ | |
249 | ||
250 | __hw_addr_init(&dev->dev_addrs); | |
251 | memset(addr, 0, sizeof(addr)); | |
252 | err = __hw_addr_add(&dev->dev_addrs, addr, sizeof(addr), | |
253 | NETDEV_HW_ADDR_T_LAN); | |
254 | if (!err) { | |
255 | /* | |
256 | * Get the first (previously created) address from the list | |
257 | * and set dev_addr pointer to this location. | |
258 | */ | |
259 | ha = list_first_entry(&dev->dev_addrs.list, | |
260 | struct netdev_hw_addr, list); | |
261 | dev->dev_addr = ha->addr; | |
262 | } | |
263 | return err; | |
264 | } | |
265 | EXPORT_SYMBOL(dev_addr_init); | |
266 | ||
267 | /** | |
268 | * dev_addr_add - Add a device address | |
269 | * @dev: device | |
270 | * @addr: address to add | |
271 | * @addr_type: address type | |
272 | * | |
273 | * Add a device address to the device or increase the reference count if | |
274 | * it already exists. | |
275 | * | |
276 | * The caller must hold the rtnl_mutex. | |
277 | */ | |
278 | int dev_addr_add(struct net_device *dev, unsigned char *addr, | |
279 | unsigned char addr_type) | |
280 | { | |
281 | int err; | |
282 | ||
283 | ASSERT_RTNL(); | |
284 | ||
285 | err = __hw_addr_add(&dev->dev_addrs, addr, dev->addr_len, addr_type); | |
286 | if (!err) | |
287 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
288 | return err; | |
289 | } | |
290 | EXPORT_SYMBOL(dev_addr_add); | |
291 | ||
292 | /** | |
293 | * dev_addr_del - Release a device address. | |
294 | * @dev: device | |
295 | * @addr: address to delete | |
296 | * @addr_type: address type | |
297 | * | |
298 | * Release reference to a device address and remove it from the device | |
299 | * if the reference count drops to zero. | |
300 | * | |
301 | * The caller must hold the rtnl_mutex. | |
302 | */ | |
303 | int dev_addr_del(struct net_device *dev, unsigned char *addr, | |
304 | unsigned char addr_type) | |
305 | { | |
306 | int err; | |
307 | struct netdev_hw_addr *ha; | |
308 | ||
309 | ASSERT_RTNL(); | |
310 | ||
311 | /* | |
312 | * We can not remove the first address from the list because | |
313 | * dev->dev_addr points to that. | |
314 | */ | |
315 | ha = list_first_entry(&dev->dev_addrs.list, | |
316 | struct netdev_hw_addr, list); | |
317 | if (ha->addr == dev->dev_addr && ha->refcount == 1) | |
318 | return -ENOENT; | |
319 | ||
320 | err = __hw_addr_del(&dev->dev_addrs, addr, dev->addr_len, | |
321 | addr_type); | |
322 | if (!err) | |
323 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
324 | return err; | |
325 | } | |
326 | EXPORT_SYMBOL(dev_addr_del); | |
327 | ||
328 | /** | |
329 | * dev_addr_add_multiple - Add device addresses from another device | |
330 | * @to_dev: device to which addresses will be added | |
331 | * @from_dev: device from which addresses will be added | |
332 | * @addr_type: address type - 0 means type will be used from from_dev | |
333 | * | |
334 | * Add device addresses of the one device to another. | |
335 | ** | |
336 | * The caller must hold the rtnl_mutex. | |
337 | */ | |
338 | int dev_addr_add_multiple(struct net_device *to_dev, | |
339 | struct net_device *from_dev, | |
340 | unsigned char addr_type) | |
341 | { | |
342 | int err; | |
343 | ||
344 | ASSERT_RTNL(); | |
345 | ||
346 | if (from_dev->addr_len != to_dev->addr_len) | |
347 | return -EINVAL; | |
348 | err = __hw_addr_add_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs, | |
349 | to_dev->addr_len, addr_type); | |
350 | if (!err) | |
351 | call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev); | |
352 | return err; | |
353 | } | |
354 | EXPORT_SYMBOL(dev_addr_add_multiple); | |
355 | ||
356 | /** | |
357 | * dev_addr_del_multiple - Delete device addresses by another device | |
358 | * @to_dev: device where the addresses will be deleted | |
359 | * @from_dev: device by which addresses the addresses will be deleted | |
360 | * @addr_type: address type - 0 means type will used from from_dev | |
361 | * | |
362 | * Deletes addresses in to device by the list of addresses in from device. | |
363 | * | |
364 | * The caller must hold the rtnl_mutex. | |
365 | */ | |
366 | int dev_addr_del_multiple(struct net_device *to_dev, | |
367 | struct net_device *from_dev, | |
368 | unsigned char addr_type) | |
369 | { | |
370 | ASSERT_RTNL(); | |
371 | ||
372 | if (from_dev->addr_len != to_dev->addr_len) | |
373 | return -EINVAL; | |
374 | __hw_addr_del_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs, | |
375 | to_dev->addr_len, addr_type); | |
376 | call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev); | |
377 | return 0; | |
378 | } | |
379 | EXPORT_SYMBOL(dev_addr_del_multiple); | |
380 | ||
381 | /* | |
382 | * Unicast list handling functions | |
383 | */ | |
384 | ||
385 | /** | |
386 | * dev_uc_add - Add a secondary unicast address | |
387 | * @dev: device | |
388 | * @addr: address to add | |
389 | * | |
390 | * Add a secondary unicast address to the device or increase | |
391 | * the reference count if it already exists. | |
392 | */ | |
393 | int dev_uc_add(struct net_device *dev, unsigned char *addr) | |
394 | { | |
395 | int err; | |
396 | ||
397 | netif_addr_lock_bh(dev); | |
398 | err = __hw_addr_add(&dev->uc, addr, dev->addr_len, | |
399 | NETDEV_HW_ADDR_T_UNICAST); | |
400 | if (!err) | |
401 | __dev_set_rx_mode(dev); | |
402 | netif_addr_unlock_bh(dev); | |
403 | return err; | |
404 | } | |
405 | EXPORT_SYMBOL(dev_uc_add); | |
406 | ||
407 | /** | |
408 | * dev_uc_del - Release secondary unicast address. | |
409 | * @dev: device | |
410 | * @addr: address to delete | |
411 | * | |
412 | * Release reference to a secondary unicast address and remove it | |
413 | * from the device if the reference count drops to zero. | |
414 | */ | |
415 | int dev_uc_del(struct net_device *dev, unsigned char *addr) | |
416 | { | |
417 | int err; | |
418 | ||
419 | netif_addr_lock_bh(dev); | |
420 | err = __hw_addr_del(&dev->uc, addr, dev->addr_len, | |
421 | NETDEV_HW_ADDR_T_UNICAST); | |
422 | if (!err) | |
423 | __dev_set_rx_mode(dev); | |
424 | netif_addr_unlock_bh(dev); | |
425 | return err; | |
426 | } | |
427 | EXPORT_SYMBOL(dev_uc_del); | |
428 | ||
429 | /** | |
430 | * dev_uc_sync - Synchronize device's unicast list to another device | |
431 | * @to: destination device | |
432 | * @from: source device | |
433 | * | |
434 | * Add newly added addresses to the destination device and release | |
435 | * addresses that have no users left. The source device must be | |
436 | * locked by netif_tx_lock_bh. | |
437 | * | |
438 | * This function is intended to be called from the dev->set_rx_mode | |
439 | * function of layered software devices. | |
440 | */ | |
441 | int dev_uc_sync(struct net_device *to, struct net_device *from) | |
442 | { | |
443 | int err = 0; | |
444 | ||
445 | if (to->addr_len != from->addr_len) | |
446 | return -EINVAL; | |
447 | ||
448 | netif_addr_lock_bh(to); | |
449 | err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len); | |
450 | if (!err) | |
451 | __dev_set_rx_mode(to); | |
452 | netif_addr_unlock_bh(to); | |
453 | return err; | |
454 | } | |
455 | EXPORT_SYMBOL(dev_uc_sync); | |
456 | ||
457 | /** | |
458 | * dev_uc_unsync - Remove synchronized addresses from the destination device | |
459 | * @to: destination device | |
460 | * @from: source device | |
461 | * | |
462 | * Remove all addresses that were added to the destination device by | |
463 | * dev_uc_sync(). This function is intended to be called from the | |
464 | * dev->stop function of layered software devices. | |
465 | */ | |
466 | void dev_uc_unsync(struct net_device *to, struct net_device *from) | |
467 | { | |
468 | if (to->addr_len != from->addr_len) | |
469 | return; | |
470 | ||
471 | netif_addr_lock_bh(from); | |
472 | netif_addr_lock(to); | |
473 | __hw_addr_unsync(&to->uc, &from->uc, to->addr_len); | |
474 | __dev_set_rx_mode(to); | |
475 | netif_addr_unlock(to); | |
476 | netif_addr_unlock_bh(from); | |
477 | } | |
478 | EXPORT_SYMBOL(dev_uc_unsync); | |
479 | ||
480 | /** | |
481 | * dev_uc_flush - Flush unicast addresses | |
482 | * @dev: device | |
483 | * | |
484 | * Flush unicast addresses. | |
485 | */ | |
486 | void dev_uc_flush(struct net_device *dev) | |
487 | { | |
488 | netif_addr_lock_bh(dev); | |
489 | __hw_addr_flush(&dev->uc); | |
490 | netif_addr_unlock_bh(dev); | |
491 | } | |
492 | EXPORT_SYMBOL(dev_uc_flush); | |
493 | ||
494 | /** | |
495 | * dev_uc_flush - Init unicast address list | |
496 | * @dev: device | |
497 | * | |
498 | * Init unicast address list. | |
499 | */ | |
500 | void dev_uc_init(struct net_device *dev) | |
501 | { | |
502 | __hw_addr_init(&dev->uc); | |
503 | } | |
504 | EXPORT_SYMBOL(dev_uc_init); | |
505 | ||
506 | /* | |
507 | * Multicast list handling functions | |
508 | */ | |
509 | ||
22bedad3 JP |
510 | static int __dev_mc_add(struct net_device *dev, unsigned char *addr, |
511 | bool global) | |
512 | { | |
513 | int err; | |
514 | ||
515 | netif_addr_lock_bh(dev); | |
516 | err = __hw_addr_add_ex(&dev->mc, addr, dev->addr_len, | |
517 | NETDEV_HW_ADDR_T_MULTICAST, global); | |
518 | if (!err) | |
519 | __dev_set_rx_mode(dev); | |
520 | netif_addr_unlock_bh(dev); | |
521 | return err; | |
522 | } | |
523 | /** | |
524 | * dev_mc_add - Add a multicast address | |
525 | * @dev: device | |
526 | * @addr: address to add | |
527 | * | |
528 | * Add a multicast address to the device or increase | |
529 | * the reference count if it already exists. | |
530 | */ | |
531 | int dev_mc_add(struct net_device *dev, unsigned char *addr) | |
532 | { | |
533 | return __dev_mc_add(dev, addr, false); | |
534 | } | |
535 | EXPORT_SYMBOL(dev_mc_add); | |
536 | ||
537 | /** | |
538 | * dev_mc_add_global - Add a global multicast address | |
539 | * @dev: device | |
540 | * @addr: address to add | |
541 | * | |
542 | * Add a global multicast address to the device. | |
543 | */ | |
544 | int dev_mc_add_global(struct net_device *dev, unsigned char *addr) | |
545 | { | |
546 | return __dev_mc_add(dev, addr, true); | |
547 | } | |
548 | EXPORT_SYMBOL(dev_mc_add_global); | |
549 | ||
550 | static int __dev_mc_del(struct net_device *dev, unsigned char *addr, | |
551 | bool global) | |
552 | { | |
553 | int err; | |
554 | ||
555 | netif_addr_lock_bh(dev); | |
556 | err = __hw_addr_del_ex(&dev->mc, addr, dev->addr_len, | |
557 | NETDEV_HW_ADDR_T_MULTICAST, global); | |
558 | if (!err) | |
559 | __dev_set_rx_mode(dev); | |
560 | netif_addr_unlock_bh(dev); | |
561 | return err; | |
562 | } | |
563 | ||
564 | /** | |
565 | * dev_mc_del - Delete a multicast address. | |
566 | * @dev: device | |
567 | * @addr: address to delete | |
568 | * | |
569 | * Release reference to a multicast address and remove it | |
570 | * from the device if the reference count drops to zero. | |
571 | */ | |
572 | int dev_mc_del(struct net_device *dev, unsigned char *addr) | |
573 | { | |
574 | return __dev_mc_del(dev, addr, false); | |
575 | } | |
576 | EXPORT_SYMBOL(dev_mc_del); | |
577 | ||
578 | /** | |
579 | * dev_mc_del_global - Delete a global multicast address. | |
580 | * @dev: device | |
581 | * @addr: address to delete | |
582 | * | |
583 | * Release reference to a multicast address and remove it | |
584 | * from the device if the reference count drops to zero. | |
585 | */ | |
586 | int dev_mc_del_global(struct net_device *dev, unsigned char *addr) | |
587 | { | |
588 | return __dev_mc_del(dev, addr, true); | |
589 | } | |
590 | EXPORT_SYMBOL(dev_mc_del_global); | |
591 | ||
592 | /** | |
593 | * dev_mc_sync - Synchronize device's unicast list to another device | |
594 | * @to: destination device | |
595 | * @from: source device | |
596 | * | |
597 | * Add newly added addresses to the destination device and release | |
598 | * addresses that have no users left. The source device must be | |
599 | * locked by netif_tx_lock_bh. | |
600 | * | |
601 | * This function is intended to be called from the dev->set_multicast_list | |
602 | * or dev->set_rx_mode function of layered software devices. | |
603 | */ | |
604 | int dev_mc_sync(struct net_device *to, struct net_device *from) | |
605 | { | |
606 | int err = 0; | |
607 | ||
608 | if (to->addr_len != from->addr_len) | |
609 | return -EINVAL; | |
610 | ||
611 | netif_addr_lock_bh(to); | |
612 | err = __hw_addr_sync(&to->mc, &from->mc, to->addr_len); | |
613 | if (!err) | |
614 | __dev_set_rx_mode(to); | |
615 | netif_addr_unlock_bh(to); | |
616 | return err; | |
617 | } | |
618 | EXPORT_SYMBOL(dev_mc_sync); | |
619 | ||
620 | /** | |
621 | * dev_mc_unsync - Remove synchronized addresses from the destination device | |
622 | * @to: destination device | |
623 | * @from: source device | |
624 | * | |
625 | * Remove all addresses that were added to the destination device by | |
626 | * dev_mc_sync(). This function is intended to be called from the | |
627 | * dev->stop function of layered software devices. | |
628 | */ | |
629 | void dev_mc_unsync(struct net_device *to, struct net_device *from) | |
630 | { | |
631 | if (to->addr_len != from->addr_len) | |
632 | return; | |
633 | ||
634 | netif_addr_lock_bh(from); | |
635 | netif_addr_lock(to); | |
636 | __hw_addr_unsync(&to->mc, &from->mc, to->addr_len); | |
637 | __dev_set_rx_mode(to); | |
638 | netif_addr_unlock(to); | |
639 | netif_addr_unlock_bh(from); | |
640 | } | |
641 | EXPORT_SYMBOL(dev_mc_unsync); | |
642 | ||
643 | /** | |
644 | * dev_mc_flush - Flush multicast addresses | |
645 | * @dev: device | |
646 | * | |
647 | * Flush multicast addresses. | |
648 | */ | |
649 | void dev_mc_flush(struct net_device *dev) | |
650 | { | |
651 | netif_addr_lock_bh(dev); | |
652 | __hw_addr_flush(&dev->mc); | |
653 | netif_addr_unlock_bh(dev); | |
654 | } | |
655 | EXPORT_SYMBOL(dev_mc_flush); | |
656 | ||
657 | /** | |
658 | * dev_mc_flush - Init multicast address list | |
659 | * @dev: device | |
660 | * | |
661 | * Init multicast address list. | |
662 | */ | |
663 | void dev_mc_init(struct net_device *dev) | |
664 | { | |
665 | __hw_addr_init(&dev->mc); | |
666 | } | |
667 | EXPORT_SYMBOL(dev_mc_init); | |
668 | ||
669 | #ifdef CONFIG_PROC_FS | |
670 | #include <linux/proc_fs.h> | |
671 | #include <linux/seq_file.h> | |
672 | ||
673 | static int dev_mc_seq_show(struct seq_file *seq, void *v) | |
674 | { | |
675 | struct netdev_hw_addr *ha; | |
676 | struct net_device *dev = v; | |
677 | ||
678 | if (v == SEQ_START_TOKEN) | |
679 | return 0; | |
680 | ||
681 | netif_addr_lock_bh(dev); | |
682 | netdev_for_each_mc_addr(ha, dev) { | |
683 | int i; | |
684 | ||
685 | seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex, | |
686 | dev->name, ha->refcount, ha->global_use); | |
687 | ||
688 | for (i = 0; i < dev->addr_len; i++) | |
689 | seq_printf(seq, "%02x", ha->addr[i]); | |
690 | ||
691 | seq_putc(seq, '\n'); | |
692 | } | |
693 | netif_addr_unlock_bh(dev); | |
694 | return 0; | |
695 | } | |
696 | ||
697 | static const struct seq_operations dev_mc_seq_ops = { | |
698 | .start = dev_seq_start, | |
699 | .next = dev_seq_next, | |
700 | .stop = dev_seq_stop, | |
701 | .show = dev_mc_seq_show, | |
702 | }; | |
703 | ||
704 | static int dev_mc_seq_open(struct inode *inode, struct file *file) | |
705 | { | |
706 | return seq_open_net(inode, file, &dev_mc_seq_ops, | |
707 | sizeof(struct seq_net_private)); | |
708 | } | |
709 | ||
710 | static const struct file_operations dev_mc_seq_fops = { | |
711 | .owner = THIS_MODULE, | |
712 | .open = dev_mc_seq_open, | |
713 | .read = seq_read, | |
714 | .llseek = seq_lseek, | |
715 | .release = seq_release_net, | |
716 | }; | |
717 | ||
718 | #endif | |
719 | ||
720 | static int __net_init dev_mc_net_init(struct net *net) | |
721 | { | |
722 | if (!proc_net_fops_create(net, "dev_mcast", 0, &dev_mc_seq_fops)) | |
723 | return -ENOMEM; | |
724 | return 0; | |
725 | } | |
726 | ||
727 | static void __net_exit dev_mc_net_exit(struct net *net) | |
728 | { | |
729 | proc_net_remove(net, "dev_mcast"); | |
730 | } | |
731 | ||
732 | static struct pernet_operations __net_initdata dev_mc_net_ops = { | |
733 | .init = dev_mc_net_init, | |
734 | .exit = dev_mc_net_exit, | |
735 | }; | |
736 | ||
737 | void __init dev_mcast_init(void) | |
738 | { | |
739 | register_pernet_subsys(&dev_mc_net_ops); | |
740 | } | |
741 |