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