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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> | |
bc3b2d7f | 16 | #include <linux/export.h> |
a748ee24 | 17 | #include <linux/list.h> |
298b9e44 | 18 | #include <linux/proc_fs.h> |
a748ee24 JP |
19 | |
20 | /* | |
21 | * General list handling functions | |
22 | */ | |
23 | ||
12a94634 | 24 | static int __hw_addr_create_ex(struct netdev_hw_addr_list *list, |
6b6e2725 | 25 | const unsigned char *addr, int addr_len, |
12a94634 JF |
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 | ||
22bedad3 | 48 | static int __hw_addr_add_ex(struct netdev_hw_addr_list *list, |
6b6e2725 | 49 | const unsigned char *addr, int addr_len, |
22bedad3 | 50 | unsigned char addr_type, bool global) |
a748ee24 JP |
51 | { |
52 | struct netdev_hw_addr *ha; | |
a748ee24 JP |
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) { | |
22bedad3 JP |
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 | } | |
a748ee24 JP |
67 | ha->refcount++; |
68 | return 0; | |
69 | } | |
70 | } | |
71 | ||
12a94634 | 72 | return __hw_addr_create_ex(list, addr, addr_len, addr_type, global); |
a748ee24 JP |
73 | } |
74 | ||
6b6e2725 | 75 | static int __hw_addr_add(struct netdev_hw_addr_list *list, |
76 | const unsigned char *addr, int addr_len, | |
77 | unsigned char addr_type) | |
22bedad3 JP |
78 | { |
79 | return __hw_addr_add_ex(list, addr, addr_len, addr_type, false); | |
80 | } | |
81 | ||
22bedad3 | 82 | static int __hw_addr_del_ex(struct netdev_hw_addr_list *list, |
6b6e2725 | 83 | const unsigned char *addr, int addr_len, |
22bedad3 | 84 | unsigned char addr_type, bool global) |
a748ee24 JP |
85 | { |
86 | struct netdev_hw_addr *ha; | |
87 | ||
88 | list_for_each_entry(ha, &list->list, list) { | |
89 | if (!memcmp(ha->addr, addr, addr_len) && | |
90 | (ha->type == addr_type || !addr_type)) { | |
22bedad3 JP |
91 | if (global) { |
92 | if (!ha->global_use) | |
93 | break; | |
94 | else | |
95 | ha->global_use = false; | |
96 | } | |
a748ee24 JP |
97 | if (--ha->refcount) |
98 | return 0; | |
99 | list_del_rcu(&ha->list); | |
217f1863 | 100 | kfree_rcu(ha, rcu_head); |
a748ee24 JP |
101 | list->count--; |
102 | return 0; | |
103 | } | |
104 | } | |
105 | return -ENOENT; | |
106 | } | |
107 | ||
6b6e2725 | 108 | static int __hw_addr_del(struct netdev_hw_addr_list *list, |
109 | const unsigned char *addr, int addr_len, | |
110 | unsigned char addr_type) | |
22bedad3 JP |
111 | { |
112 | return __hw_addr_del_ex(list, addr, addr_len, addr_type, false); | |
113 | } | |
114 | ||
115 | int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list, | |
116 | struct netdev_hw_addr_list *from_list, | |
117 | int addr_len, unsigned char addr_type) | |
a748ee24 JP |
118 | { |
119 | int err; | |
120 | struct netdev_hw_addr *ha, *ha2; | |
121 | unsigned char type; | |
122 | ||
123 | list_for_each_entry(ha, &from_list->list, list) { | |
124 | type = addr_type ? addr_type : ha->type; | |
125 | err = __hw_addr_add(to_list, ha->addr, addr_len, type); | |
126 | if (err) | |
127 | goto unroll; | |
128 | } | |
129 | return 0; | |
130 | ||
131 | unroll: | |
132 | list_for_each_entry(ha2, &from_list->list, list) { | |
133 | if (ha2 == ha) | |
134 | break; | |
135 | type = addr_type ? addr_type : ha2->type; | |
136 | __hw_addr_del(to_list, ha2->addr, addr_len, type); | |
137 | } | |
138 | return err; | |
139 | } | |
22bedad3 | 140 | EXPORT_SYMBOL(__hw_addr_add_multiple); |
a748ee24 | 141 | |
22bedad3 JP |
142 | void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list, |
143 | struct netdev_hw_addr_list *from_list, | |
144 | int addr_len, unsigned char addr_type) | |
a748ee24 JP |
145 | { |
146 | struct netdev_hw_addr *ha; | |
147 | unsigned char type; | |
148 | ||
149 | list_for_each_entry(ha, &from_list->list, list) { | |
150 | type = addr_type ? addr_type : ha->type; | |
5aca1a9e | 151 | __hw_addr_del(to_list, ha->addr, addr_len, type); |
a748ee24 JP |
152 | } |
153 | } | |
22bedad3 | 154 | EXPORT_SYMBOL(__hw_addr_del_multiple); |
a748ee24 | 155 | |
22bedad3 JP |
156 | int __hw_addr_sync(struct netdev_hw_addr_list *to_list, |
157 | struct netdev_hw_addr_list *from_list, | |
158 | int addr_len) | |
a748ee24 JP |
159 | { |
160 | int err = 0; | |
161 | struct netdev_hw_addr *ha, *tmp; | |
162 | ||
163 | list_for_each_entry_safe(ha, tmp, &from_list->list, list) { | |
164 | if (!ha->synced) { | |
165 | err = __hw_addr_add(to_list, ha->addr, | |
166 | addr_len, ha->type); | |
167 | if (err) | |
168 | break; | |
169 | ha->synced = true; | |
170 | ha->refcount++; | |
171 | } else if (ha->refcount == 1) { | |
172 | __hw_addr_del(to_list, ha->addr, addr_len, ha->type); | |
173 | __hw_addr_del(from_list, ha->addr, addr_len, ha->type); | |
174 | } | |
175 | } | |
176 | return err; | |
177 | } | |
22bedad3 | 178 | EXPORT_SYMBOL(__hw_addr_sync); |
a748ee24 | 179 | |
22bedad3 JP |
180 | void __hw_addr_unsync(struct netdev_hw_addr_list *to_list, |
181 | struct netdev_hw_addr_list *from_list, | |
182 | int addr_len) | |
a748ee24 JP |
183 | { |
184 | struct netdev_hw_addr *ha, *tmp; | |
185 | ||
186 | list_for_each_entry_safe(ha, tmp, &from_list->list, list) { | |
187 | if (ha->synced) { | |
188 | __hw_addr_del(to_list, ha->addr, | |
189 | addr_len, ha->type); | |
190 | ha->synced = false; | |
191 | __hw_addr_del(from_list, ha->addr, | |
192 | addr_len, ha->type); | |
193 | } | |
194 | } | |
195 | } | |
22bedad3 | 196 | EXPORT_SYMBOL(__hw_addr_unsync); |
a748ee24 | 197 | |
22bedad3 | 198 | void __hw_addr_flush(struct netdev_hw_addr_list *list) |
a748ee24 JP |
199 | { |
200 | struct netdev_hw_addr *ha, *tmp; | |
201 | ||
202 | list_for_each_entry_safe(ha, tmp, &list->list, list) { | |
203 | list_del_rcu(&ha->list); | |
217f1863 | 204 | kfree_rcu(ha, rcu_head); |
a748ee24 JP |
205 | } |
206 | list->count = 0; | |
207 | } | |
22bedad3 | 208 | EXPORT_SYMBOL(__hw_addr_flush); |
a748ee24 | 209 | |
22bedad3 | 210 | void __hw_addr_init(struct netdev_hw_addr_list *list) |
a748ee24 JP |
211 | { |
212 | INIT_LIST_HEAD(&list->list); | |
213 | list->count = 0; | |
214 | } | |
22bedad3 | 215 | EXPORT_SYMBOL(__hw_addr_init); |
a748ee24 JP |
216 | |
217 | /* | |
218 | * Device addresses handling functions | |
219 | */ | |
220 | ||
221 | /** | |
222 | * dev_addr_flush - Flush device address list | |
223 | * @dev: device | |
224 | * | |
225 | * Flush device address list and reset ->dev_addr. | |
226 | * | |
227 | * The caller must hold the rtnl_mutex. | |
228 | */ | |
229 | void dev_addr_flush(struct net_device *dev) | |
230 | { | |
231 | /* rtnl_mutex must be held here */ | |
232 | ||
233 | __hw_addr_flush(&dev->dev_addrs); | |
234 | dev->dev_addr = NULL; | |
235 | } | |
236 | EXPORT_SYMBOL(dev_addr_flush); | |
237 | ||
238 | /** | |
239 | * dev_addr_init - Init device address list | |
240 | * @dev: device | |
241 | * | |
242 | * Init device address list and create the first element, | |
243 | * used by ->dev_addr. | |
244 | * | |
245 | * The caller must hold the rtnl_mutex. | |
246 | */ | |
247 | int dev_addr_init(struct net_device *dev) | |
248 | { | |
249 | unsigned char addr[MAX_ADDR_LEN]; | |
250 | struct netdev_hw_addr *ha; | |
251 | int err; | |
252 | ||
253 | /* rtnl_mutex must be held here */ | |
254 | ||
255 | __hw_addr_init(&dev->dev_addrs); | |
256 | memset(addr, 0, sizeof(addr)); | |
257 | err = __hw_addr_add(&dev->dev_addrs, addr, sizeof(addr), | |
258 | NETDEV_HW_ADDR_T_LAN); | |
259 | if (!err) { | |
260 | /* | |
261 | * Get the first (previously created) address from the list | |
262 | * and set dev_addr pointer to this location. | |
263 | */ | |
264 | ha = list_first_entry(&dev->dev_addrs.list, | |
265 | struct netdev_hw_addr, list); | |
266 | dev->dev_addr = ha->addr; | |
267 | } | |
268 | return err; | |
269 | } | |
270 | EXPORT_SYMBOL(dev_addr_init); | |
271 | ||
272 | /** | |
273 | * dev_addr_add - Add a device address | |
274 | * @dev: device | |
275 | * @addr: address to add | |
276 | * @addr_type: address type | |
277 | * | |
278 | * Add a device address to the device or increase the reference count if | |
279 | * it already exists. | |
280 | * | |
281 | * The caller must hold the rtnl_mutex. | |
282 | */ | |
6b6e2725 | 283 | int dev_addr_add(struct net_device *dev, const unsigned char *addr, |
a748ee24 JP |
284 | unsigned char addr_type) |
285 | { | |
286 | int err; | |
287 | ||
288 | ASSERT_RTNL(); | |
289 | ||
290 | err = __hw_addr_add(&dev->dev_addrs, addr, dev->addr_len, addr_type); | |
291 | if (!err) | |
292 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
293 | return err; | |
294 | } | |
295 | EXPORT_SYMBOL(dev_addr_add); | |
296 | ||
297 | /** | |
298 | * dev_addr_del - Release a device address. | |
299 | * @dev: device | |
300 | * @addr: address to delete | |
301 | * @addr_type: address type | |
302 | * | |
303 | * Release reference to a device address and remove it from the device | |
304 | * if the reference count drops to zero. | |
305 | * | |
306 | * The caller must hold the rtnl_mutex. | |
307 | */ | |
6b6e2725 | 308 | int dev_addr_del(struct net_device *dev, const unsigned char *addr, |
a748ee24 JP |
309 | unsigned char addr_type) |
310 | { | |
311 | int err; | |
312 | struct netdev_hw_addr *ha; | |
313 | ||
314 | ASSERT_RTNL(); | |
315 | ||
316 | /* | |
317 | * We can not remove the first address from the list because | |
318 | * dev->dev_addr points to that. | |
319 | */ | |
320 | ha = list_first_entry(&dev->dev_addrs.list, | |
321 | struct netdev_hw_addr, list); | |
a652208e JP |
322 | if (!memcmp(ha->addr, addr, dev->addr_len) && |
323 | ha->type == addr_type && ha->refcount == 1) | |
a748ee24 JP |
324 | return -ENOENT; |
325 | ||
326 | err = __hw_addr_del(&dev->dev_addrs, addr, dev->addr_len, | |
327 | addr_type); | |
328 | if (!err) | |
329 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
330 | return err; | |
331 | } | |
332 | EXPORT_SYMBOL(dev_addr_del); | |
333 | ||
334 | /** | |
335 | * dev_addr_add_multiple - Add device addresses from another device | |
336 | * @to_dev: device to which addresses will be added | |
337 | * @from_dev: device from which addresses will be added | |
338 | * @addr_type: address type - 0 means type will be used from from_dev | |
339 | * | |
340 | * Add device addresses of the one device to another. | |
341 | ** | |
342 | * The caller must hold the rtnl_mutex. | |
343 | */ | |
344 | int dev_addr_add_multiple(struct net_device *to_dev, | |
345 | struct net_device *from_dev, | |
346 | unsigned char addr_type) | |
347 | { | |
348 | int err; | |
349 | ||
350 | ASSERT_RTNL(); | |
351 | ||
352 | if (from_dev->addr_len != to_dev->addr_len) | |
353 | return -EINVAL; | |
354 | err = __hw_addr_add_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs, | |
355 | to_dev->addr_len, addr_type); | |
356 | if (!err) | |
357 | call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev); | |
358 | return err; | |
359 | } | |
360 | EXPORT_SYMBOL(dev_addr_add_multiple); | |
361 | ||
362 | /** | |
363 | * dev_addr_del_multiple - Delete device addresses by another device | |
364 | * @to_dev: device where the addresses will be deleted | |
177b241d GE |
365 | * @from_dev: device supplying the addresses to be deleted |
366 | * @addr_type: address type - 0 means type will be used from from_dev | |
a748ee24 JP |
367 | * |
368 | * Deletes addresses in to device by the list of addresses in from device. | |
369 | * | |
370 | * The caller must hold the rtnl_mutex. | |
371 | */ | |
372 | int dev_addr_del_multiple(struct net_device *to_dev, | |
373 | struct net_device *from_dev, | |
374 | unsigned char addr_type) | |
375 | { | |
376 | ASSERT_RTNL(); | |
377 | ||
378 | if (from_dev->addr_len != to_dev->addr_len) | |
379 | return -EINVAL; | |
380 | __hw_addr_del_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs, | |
381 | to_dev->addr_len, addr_type); | |
382 | call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev); | |
383 | return 0; | |
384 | } | |
385 | EXPORT_SYMBOL(dev_addr_del_multiple); | |
386 | ||
387 | /* | |
388 | * Unicast list handling functions | |
389 | */ | |
390 | ||
12a94634 JF |
391 | /** |
392 | * dev_uc_add_excl - Add a global secondary unicast address | |
393 | * @dev: device | |
394 | * @addr: address to add | |
395 | */ | |
6b6e2725 | 396 | int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr) |
12a94634 JF |
397 | { |
398 | struct netdev_hw_addr *ha; | |
399 | int err; | |
400 | ||
401 | netif_addr_lock_bh(dev); | |
402 | list_for_each_entry(ha, &dev->uc.list, list) { | |
403 | if (!memcmp(ha->addr, addr, dev->addr_len) && | |
404 | ha->type == NETDEV_HW_ADDR_T_UNICAST) { | |
405 | err = -EEXIST; | |
406 | goto out; | |
407 | } | |
408 | } | |
409 | err = __hw_addr_create_ex(&dev->uc, addr, dev->addr_len, | |
410 | NETDEV_HW_ADDR_T_UNICAST, true); | |
411 | if (!err) | |
412 | __dev_set_rx_mode(dev); | |
413 | out: | |
414 | netif_addr_unlock_bh(dev); | |
415 | return err; | |
416 | } | |
417 | EXPORT_SYMBOL(dev_uc_add_excl); | |
418 | ||
a748ee24 JP |
419 | /** |
420 | * dev_uc_add - Add a secondary unicast address | |
421 | * @dev: device | |
422 | * @addr: address to add | |
423 | * | |
424 | * Add a secondary unicast address to the device or increase | |
425 | * the reference count if it already exists. | |
426 | */ | |
6b6e2725 | 427 | int dev_uc_add(struct net_device *dev, const unsigned char *addr) |
a748ee24 JP |
428 | { |
429 | int err; | |
430 | ||
431 | netif_addr_lock_bh(dev); | |
432 | err = __hw_addr_add(&dev->uc, addr, dev->addr_len, | |
433 | NETDEV_HW_ADDR_T_UNICAST); | |
434 | if (!err) | |
435 | __dev_set_rx_mode(dev); | |
436 | netif_addr_unlock_bh(dev); | |
437 | return err; | |
438 | } | |
439 | EXPORT_SYMBOL(dev_uc_add); | |
440 | ||
441 | /** | |
442 | * dev_uc_del - Release secondary unicast address. | |
443 | * @dev: device | |
444 | * @addr: address to delete | |
445 | * | |
446 | * Release reference to a secondary unicast address and remove it | |
447 | * from the device if the reference count drops to zero. | |
448 | */ | |
6b6e2725 | 449 | int dev_uc_del(struct net_device *dev, const unsigned char *addr) |
a748ee24 JP |
450 | { |
451 | int err; | |
452 | ||
453 | netif_addr_lock_bh(dev); | |
454 | err = __hw_addr_del(&dev->uc, addr, dev->addr_len, | |
455 | NETDEV_HW_ADDR_T_UNICAST); | |
456 | if (!err) | |
457 | __dev_set_rx_mode(dev); | |
458 | netif_addr_unlock_bh(dev); | |
459 | return err; | |
460 | } | |
461 | EXPORT_SYMBOL(dev_uc_del); | |
462 | ||
463 | /** | |
464 | * dev_uc_sync - Synchronize device's unicast list to another device | |
465 | * @to: destination device | |
466 | * @from: source device | |
467 | * | |
468 | * Add newly added addresses to the destination device and release | |
469 | * addresses that have no users left. The source device must be | |
ab16ebf3 | 470 | * locked by netif_addr_lock_bh. |
a748ee24 JP |
471 | * |
472 | * This function is intended to be called from the dev->set_rx_mode | |
473 | * function of layered software devices. | |
474 | */ | |
475 | int dev_uc_sync(struct net_device *to, struct net_device *from) | |
476 | { | |
477 | int err = 0; | |
478 | ||
479 | if (to->addr_len != from->addr_len) | |
480 | return -EINVAL; | |
481 | ||
2429f7ac | 482 | netif_addr_lock_nested(to); |
a748ee24 JP |
483 | err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len); |
484 | if (!err) | |
485 | __dev_set_rx_mode(to); | |
2429f7ac | 486 | netif_addr_unlock(to); |
a748ee24 JP |
487 | return err; |
488 | } | |
489 | EXPORT_SYMBOL(dev_uc_sync); | |
490 | ||
491 | /** | |
492 | * dev_uc_unsync - Remove synchronized addresses from the destination device | |
493 | * @to: destination device | |
494 | * @from: source device | |
495 | * | |
496 | * Remove all addresses that were added to the destination device by | |
497 | * dev_uc_sync(). This function is intended to be called from the | |
498 | * dev->stop function of layered software devices. | |
499 | */ | |
500 | void dev_uc_unsync(struct net_device *to, struct net_device *from) | |
501 | { | |
502 | if (to->addr_len != from->addr_len) | |
503 | return; | |
504 | ||
505 | netif_addr_lock_bh(from); | |
2429f7ac | 506 | netif_addr_lock_nested(to); |
a748ee24 JP |
507 | __hw_addr_unsync(&to->uc, &from->uc, to->addr_len); |
508 | __dev_set_rx_mode(to); | |
509 | netif_addr_unlock(to); | |
510 | netif_addr_unlock_bh(from); | |
511 | } | |
512 | EXPORT_SYMBOL(dev_uc_unsync); | |
513 | ||
514 | /** | |
515 | * dev_uc_flush - Flush unicast addresses | |
516 | * @dev: device | |
517 | * | |
518 | * Flush unicast addresses. | |
519 | */ | |
520 | void dev_uc_flush(struct net_device *dev) | |
521 | { | |
522 | netif_addr_lock_bh(dev); | |
523 | __hw_addr_flush(&dev->uc); | |
524 | netif_addr_unlock_bh(dev); | |
525 | } | |
526 | EXPORT_SYMBOL(dev_uc_flush); | |
527 | ||
528 | /** | |
529 | * dev_uc_flush - Init unicast address list | |
530 | * @dev: device | |
531 | * | |
532 | * Init unicast address list. | |
533 | */ | |
534 | void dev_uc_init(struct net_device *dev) | |
535 | { | |
536 | __hw_addr_init(&dev->uc); | |
537 | } | |
538 | EXPORT_SYMBOL(dev_uc_init); | |
539 | ||
540 | /* | |
541 | * Multicast list handling functions | |
542 | */ | |
543 | ||
12a94634 JF |
544 | /** |
545 | * dev_mc_add_excl - Add a global secondary multicast address | |
546 | * @dev: device | |
547 | * @addr: address to add | |
548 | */ | |
6b6e2725 | 549 | int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr) |
12a94634 JF |
550 | { |
551 | struct netdev_hw_addr *ha; | |
552 | int err; | |
553 | ||
554 | netif_addr_lock_bh(dev); | |
555 | list_for_each_entry(ha, &dev->mc.list, list) { | |
556 | if (!memcmp(ha->addr, addr, dev->addr_len) && | |
557 | ha->type == NETDEV_HW_ADDR_T_MULTICAST) { | |
558 | err = -EEXIST; | |
559 | goto out; | |
560 | } | |
561 | } | |
562 | err = __hw_addr_create_ex(&dev->mc, addr, dev->addr_len, | |
563 | NETDEV_HW_ADDR_T_MULTICAST, true); | |
564 | if (!err) | |
565 | __dev_set_rx_mode(dev); | |
566 | out: | |
567 | netif_addr_unlock_bh(dev); | |
568 | return err; | |
569 | } | |
570 | EXPORT_SYMBOL(dev_mc_add_excl); | |
571 | ||
6b6e2725 | 572 | static int __dev_mc_add(struct net_device *dev, const unsigned char *addr, |
22bedad3 JP |
573 | bool global) |
574 | { | |
575 | int err; | |
576 | ||
577 | netif_addr_lock_bh(dev); | |
578 | err = __hw_addr_add_ex(&dev->mc, addr, dev->addr_len, | |
579 | NETDEV_HW_ADDR_T_MULTICAST, global); | |
580 | if (!err) | |
581 | __dev_set_rx_mode(dev); | |
582 | netif_addr_unlock_bh(dev); | |
583 | return err; | |
584 | } | |
585 | /** | |
586 | * dev_mc_add - Add a multicast address | |
587 | * @dev: device | |
588 | * @addr: address to add | |
589 | * | |
590 | * Add a multicast address to the device or increase | |
591 | * the reference count if it already exists. | |
592 | */ | |
6b6e2725 | 593 | int dev_mc_add(struct net_device *dev, const unsigned char *addr) |
22bedad3 JP |
594 | { |
595 | return __dev_mc_add(dev, addr, false); | |
596 | } | |
597 | EXPORT_SYMBOL(dev_mc_add); | |
598 | ||
599 | /** | |
600 | * dev_mc_add_global - Add a global multicast address | |
601 | * @dev: device | |
602 | * @addr: address to add | |
603 | * | |
604 | * Add a global multicast address to the device. | |
605 | */ | |
6b6e2725 | 606 | int dev_mc_add_global(struct net_device *dev, const unsigned char *addr) |
22bedad3 JP |
607 | { |
608 | return __dev_mc_add(dev, addr, true); | |
609 | } | |
610 | EXPORT_SYMBOL(dev_mc_add_global); | |
611 | ||
6b6e2725 | 612 | static int __dev_mc_del(struct net_device *dev, const unsigned char *addr, |
22bedad3 JP |
613 | bool global) |
614 | { | |
615 | int err; | |
616 | ||
617 | netif_addr_lock_bh(dev); | |
618 | err = __hw_addr_del_ex(&dev->mc, addr, dev->addr_len, | |
619 | NETDEV_HW_ADDR_T_MULTICAST, global); | |
620 | if (!err) | |
621 | __dev_set_rx_mode(dev); | |
622 | netif_addr_unlock_bh(dev); | |
623 | return err; | |
624 | } | |
625 | ||
626 | /** | |
627 | * dev_mc_del - Delete a multicast address. | |
628 | * @dev: device | |
629 | * @addr: address to delete | |
630 | * | |
631 | * Release reference to a multicast address and remove it | |
632 | * from the device if the reference count drops to zero. | |
633 | */ | |
6b6e2725 | 634 | int dev_mc_del(struct net_device *dev, const unsigned char *addr) |
22bedad3 JP |
635 | { |
636 | return __dev_mc_del(dev, addr, false); | |
637 | } | |
638 | EXPORT_SYMBOL(dev_mc_del); | |
639 | ||
640 | /** | |
641 | * dev_mc_del_global - Delete a global multicast address. | |
642 | * @dev: device | |
643 | * @addr: address to delete | |
644 | * | |
645 | * Release reference to a multicast address and remove it | |
646 | * from the device if the reference count drops to zero. | |
647 | */ | |
6b6e2725 | 648 | int dev_mc_del_global(struct net_device *dev, const unsigned char *addr) |
22bedad3 JP |
649 | { |
650 | return __dev_mc_del(dev, addr, true); | |
651 | } | |
652 | EXPORT_SYMBOL(dev_mc_del_global); | |
653 | ||
654 | /** | |
655 | * dev_mc_sync - Synchronize device's unicast list to another device | |
656 | * @to: destination device | |
657 | * @from: source device | |
658 | * | |
659 | * Add newly added addresses to the destination device and release | |
660 | * addresses that have no users left. The source device must be | |
ab16ebf3 | 661 | * locked by netif_addr_lock_bh. |
22bedad3 | 662 | * |
b81693d9 JP |
663 | * This function is intended to be called from the ndo_set_rx_mode |
664 | * function of layered software devices. | |
22bedad3 JP |
665 | */ |
666 | int dev_mc_sync(struct net_device *to, struct net_device *from) | |
667 | { | |
668 | int err = 0; | |
669 | ||
670 | if (to->addr_len != from->addr_len) | |
671 | return -EINVAL; | |
672 | ||
2429f7ac | 673 | netif_addr_lock_nested(to); |
22bedad3 JP |
674 | err = __hw_addr_sync(&to->mc, &from->mc, to->addr_len); |
675 | if (!err) | |
676 | __dev_set_rx_mode(to); | |
2429f7ac | 677 | netif_addr_unlock(to); |
22bedad3 JP |
678 | return err; |
679 | } | |
680 | EXPORT_SYMBOL(dev_mc_sync); | |
681 | ||
682 | /** | |
683 | * dev_mc_unsync - Remove synchronized addresses from the destination device | |
684 | * @to: destination device | |
685 | * @from: source device | |
686 | * | |
687 | * Remove all addresses that were added to the destination device by | |
688 | * dev_mc_sync(). This function is intended to be called from the | |
689 | * dev->stop function of layered software devices. | |
690 | */ | |
691 | void dev_mc_unsync(struct net_device *to, struct net_device *from) | |
692 | { | |
693 | if (to->addr_len != from->addr_len) | |
694 | return; | |
695 | ||
696 | netif_addr_lock_bh(from); | |
2429f7ac | 697 | netif_addr_lock_nested(to); |
22bedad3 JP |
698 | __hw_addr_unsync(&to->mc, &from->mc, to->addr_len); |
699 | __dev_set_rx_mode(to); | |
700 | netif_addr_unlock(to); | |
701 | netif_addr_unlock_bh(from); | |
702 | } | |
703 | EXPORT_SYMBOL(dev_mc_unsync); | |
704 | ||
705 | /** | |
706 | * dev_mc_flush - Flush multicast addresses | |
707 | * @dev: device | |
708 | * | |
709 | * Flush multicast addresses. | |
710 | */ | |
711 | void dev_mc_flush(struct net_device *dev) | |
712 | { | |
713 | netif_addr_lock_bh(dev); | |
714 | __hw_addr_flush(&dev->mc); | |
715 | netif_addr_unlock_bh(dev); | |
716 | } | |
717 | EXPORT_SYMBOL(dev_mc_flush); | |
718 | ||
719 | /** | |
720 | * dev_mc_flush - Init multicast address list | |
721 | * @dev: device | |
722 | * | |
723 | * Init multicast address list. | |
724 | */ | |
725 | void dev_mc_init(struct net_device *dev) | |
726 | { | |
727 | __hw_addr_init(&dev->mc); | |
728 | } | |
729 | EXPORT_SYMBOL(dev_mc_init); | |
730 | ||
731 | #ifdef CONFIG_PROC_FS | |
22bedad3 JP |
732 | #include <linux/seq_file.h> |
733 | ||
734 | static int dev_mc_seq_show(struct seq_file *seq, void *v) | |
735 | { | |
736 | struct netdev_hw_addr *ha; | |
737 | struct net_device *dev = v; | |
738 | ||
739 | if (v == SEQ_START_TOKEN) | |
740 | return 0; | |
741 | ||
742 | netif_addr_lock_bh(dev); | |
743 | netdev_for_each_mc_addr(ha, dev) { | |
744 | int i; | |
745 | ||
746 | seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex, | |
747 | dev->name, ha->refcount, ha->global_use); | |
748 | ||
749 | for (i = 0; i < dev->addr_len; i++) | |
750 | seq_printf(seq, "%02x", ha->addr[i]); | |
751 | ||
752 | seq_putc(seq, '\n'); | |
753 | } | |
754 | netif_addr_unlock_bh(dev); | |
755 | return 0; | |
756 | } | |
757 | ||
758 | static const struct seq_operations dev_mc_seq_ops = { | |
759 | .start = dev_seq_start, | |
760 | .next = dev_seq_next, | |
761 | .stop = dev_seq_stop, | |
762 | .show = dev_mc_seq_show, | |
763 | }; | |
764 | ||
765 | static int dev_mc_seq_open(struct inode *inode, struct file *file) | |
766 | { | |
2def16ae ED |
767 | return seq_open_net(inode, file, &dev_mc_seq_ops, |
768 | sizeof(struct seq_net_private)); | |
22bedad3 JP |
769 | } |
770 | ||
771 | static const struct file_operations dev_mc_seq_fops = { | |
772 | .owner = THIS_MODULE, | |
773 | .open = dev_mc_seq_open, | |
774 | .read = seq_read, | |
775 | .llseek = seq_lseek, | |
776 | .release = seq_release_net, | |
777 | }; | |
778 | ||
779 | #endif | |
780 | ||
781 | static int __net_init dev_mc_net_init(struct net *net) | |
782 | { | |
d4beaa66 | 783 | if (!proc_create("dev_mcast", 0, net->proc_net, &dev_mc_seq_fops)) |
22bedad3 JP |
784 | return -ENOMEM; |
785 | return 0; | |
786 | } | |
787 | ||
788 | static void __net_exit dev_mc_net_exit(struct net *net) | |
789 | { | |
ece31ffd | 790 | remove_proc_entry("dev_mcast", net->proc_net); |
22bedad3 JP |
791 | } |
792 | ||
793 | static struct pernet_operations __net_initdata dev_mc_net_ops = { | |
794 | .init = dev_mc_net_init, | |
795 | .exit = dev_mc_net_exit, | |
796 | }; | |
797 | ||
798 | void __init dev_mcast_init(void) | |
799 | { | |
800 | register_pernet_subsys(&dev_mc_net_ops); | |
801 | } | |
802 |