Staging: hv: mousevsc: Cleanup and properly implement reportdesc_callback()
[zen-stable.git] / net / core / dev_addr_lists.c
blobe2e66939ed009df93fe61b22c07d33c892fdeb4e
1 /*
2 * net/core/dev_addr_lists.c - Functions for handling net device lists
3 * Copyright (c) 2010 Jiri Pirko <jpirko@redhat.com>
5 * This file contains functions for working with unicast, multicast and device
6 * addresses lists.
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.
14 #include <linux/netdevice.h>
15 #include <linux/rtnetlink.h>
16 #include <linux/list.h>
17 #include <linux/proc_fs.h>
20 * General list handling functions
23 static 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)
27 struct netdev_hw_addr *ha;
28 int alloc_size;
30 if (addr_len > MAX_ADDR_LEN)
31 return -EINVAL;
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;
43 ha->refcount++;
44 return 0;
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;
65 static int __hw_addr_add(struct netdev_hw_addr_list *list, unsigned char *addr,
66 int addr_len, unsigned char addr_type)
68 return __hw_addr_add_ex(list, addr, addr_len, addr_type, false);
71 static 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)
75 struct netdev_hw_addr *ha;
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;
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;
94 return -ENOENT;
97 static int __hw_addr_del(struct netdev_hw_addr_list *list, unsigned char *addr,
98 int addr_len, unsigned char addr_type)
100 return __hw_addr_del_ex(list, addr, addr_len, addr_type, false);
103 int __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)
107 int err;
108 struct netdev_hw_addr *ha, *ha2;
109 unsigned char type;
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;
117 return 0;
119 unroll:
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);
126 return err;
128 EXPORT_SYMBOL(__hw_addr_add_multiple);
130 void __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)
134 struct netdev_hw_addr *ha;
135 unsigned char type;
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);
142 EXPORT_SYMBOL(__hw_addr_del_multiple);
144 int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
145 struct netdev_hw_addr_list *from_list,
146 int addr_len)
148 int err = 0;
149 struct netdev_hw_addr *ha, *tmp;
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);
164 return err;
166 EXPORT_SYMBOL(__hw_addr_sync);
168 void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
169 struct netdev_hw_addr_list *from_list,
170 int addr_len)
172 struct netdev_hw_addr *ha, *tmp;
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);
184 EXPORT_SYMBOL(__hw_addr_unsync);
186 void __hw_addr_flush(struct netdev_hw_addr_list *list)
188 struct netdev_hw_addr *ha, *tmp;
190 list_for_each_entry_safe(ha, tmp, &list->list, list) {
191 list_del_rcu(&ha->list);
192 kfree_rcu(ha, rcu_head);
194 list->count = 0;
196 EXPORT_SYMBOL(__hw_addr_flush);
198 void __hw_addr_init(struct netdev_hw_addr_list *list)
200 INIT_LIST_HEAD(&list->list);
201 list->count = 0;
203 EXPORT_SYMBOL(__hw_addr_init);
206 * Device addresses handling functions
210 * dev_addr_flush - Flush device address list
211 * @dev: device
213 * Flush device address list and reset ->dev_addr.
215 * The caller must hold the rtnl_mutex.
217 void dev_addr_flush(struct net_device *dev)
219 /* rtnl_mutex must be held here */
221 __hw_addr_flush(&dev->dev_addrs);
222 dev->dev_addr = NULL;
224 EXPORT_SYMBOL(dev_addr_flush);
227 * dev_addr_init - Init device address list
228 * @dev: device
230 * Init device address list and create the first element,
231 * used by ->dev_addr.
233 * The caller must hold the rtnl_mutex.
235 int dev_addr_init(struct net_device *dev)
237 unsigned char addr[MAX_ADDR_LEN];
238 struct netdev_hw_addr *ha;
239 int err;
241 /* rtnl_mutex must be held here */
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) {
249 * Get the first (previously created) address from the list
250 * and set dev_addr pointer to this location.
252 ha = list_first_entry(&dev->dev_addrs.list,
253 struct netdev_hw_addr, list);
254 dev->dev_addr = ha->addr;
256 return err;
258 EXPORT_SYMBOL(dev_addr_init);
261 * dev_addr_add - Add a device address
262 * @dev: device
263 * @addr: address to add
264 * @addr_type: address type
266 * Add a device address to the device or increase the reference count if
267 * it already exists.
269 * The caller must hold the rtnl_mutex.
271 int dev_addr_add(struct net_device *dev, unsigned char *addr,
272 unsigned char addr_type)
274 int err;
276 ASSERT_RTNL();
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;
283 EXPORT_SYMBOL(dev_addr_add);
286 * dev_addr_del - Release a device address.
287 * @dev: device
288 * @addr: address to delete
289 * @addr_type: address type
291 * Release reference to a device address and remove it from the device
292 * if the reference count drops to zero.
294 * The caller must hold the rtnl_mutex.
296 int dev_addr_del(struct net_device *dev, unsigned char *addr,
297 unsigned char addr_type)
299 int err;
300 struct netdev_hw_addr *ha;
302 ASSERT_RTNL();
305 * We can not remove the first address from the list because
306 * dev->dev_addr points to that.
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;
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;
319 EXPORT_SYMBOL(dev_addr_del);
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
327 * Add device addresses of the one device to another.
329 * The caller must hold the rtnl_mutex.
331 int dev_addr_add_multiple(struct net_device *to_dev,
332 struct net_device *from_dev,
333 unsigned char addr_type)
335 int err;
337 ASSERT_RTNL();
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;
347 EXPORT_SYMBOL(dev_addr_add_multiple);
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
355 * Deletes addresses in to device by the list of addresses in from device.
357 * The caller must hold the rtnl_mutex.
359 int dev_addr_del_multiple(struct net_device *to_dev,
360 struct net_device *from_dev,
361 unsigned char addr_type)
363 ASSERT_RTNL();
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;
372 EXPORT_SYMBOL(dev_addr_del_multiple);
375 * Unicast list handling functions
379 * dev_uc_add - Add a secondary unicast address
380 * @dev: device
381 * @addr: address to add
383 * Add a secondary unicast address to the device or increase
384 * the reference count if it already exists.
386 int dev_uc_add(struct net_device *dev, unsigned char *addr)
388 int err;
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;
398 EXPORT_SYMBOL(dev_uc_add);
401 * dev_uc_del - Release secondary unicast address.
402 * @dev: device
403 * @addr: address to delete
405 * Release reference to a secondary unicast address and remove it
406 * from the device if the reference count drops to zero.
408 int dev_uc_del(struct net_device *dev, unsigned char *addr)
410 int err;
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;
420 EXPORT_SYMBOL(dev_uc_del);
423 * dev_uc_sync - Synchronize device's unicast list to another device
424 * @to: destination device
425 * @from: source device
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.
431 * This function is intended to be called from the dev->set_rx_mode
432 * function of layered software devices.
434 int dev_uc_sync(struct net_device *to, struct net_device *from)
436 int err = 0;
438 if (to->addr_len != from->addr_len)
439 return -EINVAL;
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;
448 EXPORT_SYMBOL(dev_uc_sync);
451 * dev_uc_unsync - Remove synchronized addresses from the destination device
452 * @to: destination device
453 * @from: source device
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.
459 void dev_uc_unsync(struct net_device *to, struct net_device *from)
461 if (to->addr_len != from->addr_len)
462 return;
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);
471 EXPORT_SYMBOL(dev_uc_unsync);
474 * dev_uc_flush - Flush unicast addresses
475 * @dev: device
477 * Flush unicast addresses.
479 void dev_uc_flush(struct net_device *dev)
481 netif_addr_lock_bh(dev);
482 __hw_addr_flush(&dev->uc);
483 netif_addr_unlock_bh(dev);
485 EXPORT_SYMBOL(dev_uc_flush);
488 * dev_uc_flush - Init unicast address list
489 * @dev: device
491 * Init unicast address list.
493 void dev_uc_init(struct net_device *dev)
495 __hw_addr_init(&dev->uc);
497 EXPORT_SYMBOL(dev_uc_init);
500 * Multicast list handling functions
503 static int __dev_mc_add(struct net_device *dev, unsigned char *addr,
504 bool global)
506 int err;
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;
517 * dev_mc_add - Add a multicast address
518 * @dev: device
519 * @addr: address to add
521 * Add a multicast address to the device or increase
522 * the reference count if it already exists.
524 int dev_mc_add(struct net_device *dev, unsigned char *addr)
526 return __dev_mc_add(dev, addr, false);
528 EXPORT_SYMBOL(dev_mc_add);
531 * dev_mc_add_global - Add a global multicast address
532 * @dev: device
533 * @addr: address to add
535 * Add a global multicast address to the device.
537 int dev_mc_add_global(struct net_device *dev, unsigned char *addr)
539 return __dev_mc_add(dev, addr, true);
541 EXPORT_SYMBOL(dev_mc_add_global);
543 static int __dev_mc_del(struct net_device *dev, unsigned char *addr,
544 bool global)
546 int err;
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;
558 * dev_mc_del - Delete a multicast address.
559 * @dev: device
560 * @addr: address to delete
562 * Release reference to a multicast address and remove it
563 * from the device if the reference count drops to zero.
565 int dev_mc_del(struct net_device *dev, unsigned char *addr)
567 return __dev_mc_del(dev, addr, false);
569 EXPORT_SYMBOL(dev_mc_del);
572 * dev_mc_del_global - Delete a global multicast address.
573 * @dev: device
574 * @addr: address to delete
576 * Release reference to a multicast address and remove it
577 * from the device if the reference count drops to zero.
579 int dev_mc_del_global(struct net_device *dev, unsigned char *addr)
581 return __dev_mc_del(dev, addr, true);
583 EXPORT_SYMBOL(dev_mc_del_global);
586 * dev_mc_sync - Synchronize device's unicast list to another device
587 * @to: destination device
588 * @from: source device
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.
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.
597 int dev_mc_sync(struct net_device *to, struct net_device *from)
599 int err = 0;
601 if (to->addr_len != from->addr_len)
602 return -EINVAL;
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;
611 EXPORT_SYMBOL(dev_mc_sync);
614 * dev_mc_unsync - Remove synchronized addresses from the destination device
615 * @to: destination device
616 * @from: source device
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.
622 void dev_mc_unsync(struct net_device *to, struct net_device *from)
624 if (to->addr_len != from->addr_len)
625 return;
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);
634 EXPORT_SYMBOL(dev_mc_unsync);
637 * dev_mc_flush - Flush multicast addresses
638 * @dev: device
640 * Flush multicast addresses.
642 void dev_mc_flush(struct net_device *dev)
644 netif_addr_lock_bh(dev);
645 __hw_addr_flush(&dev->mc);
646 netif_addr_unlock_bh(dev);
648 EXPORT_SYMBOL(dev_mc_flush);
651 * dev_mc_flush - Init multicast address list
652 * @dev: device
654 * Init multicast address list.
656 void dev_mc_init(struct net_device *dev)
658 __hw_addr_init(&dev->mc);
660 EXPORT_SYMBOL(dev_mc_init);
662 #ifdef CONFIG_PROC_FS
663 #include <linux/seq_file.h>
665 static int dev_mc_seq_show(struct seq_file *seq, void *v)
667 struct netdev_hw_addr *ha;
668 struct net_device *dev = v;
670 if (v == SEQ_START_TOKEN)
671 return 0;
673 netif_addr_lock_bh(dev);
674 netdev_for_each_mc_addr(ha, dev) {
675 int i;
677 seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex,
678 dev->name, ha->refcount, ha->global_use);
680 for (i = 0; i < dev->addr_len; i++)
681 seq_printf(seq, "%02x", ha->addr[i]);
683 seq_putc(seq, '\n');
685 netif_addr_unlock_bh(dev);
686 return 0;
689 static 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,
696 static int dev_mc_seq_open(struct inode *inode, struct file *file)
698 return seq_open_net(inode, file, &dev_mc_seq_ops,
699 sizeof(struct seq_net_private));
702 static 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,
710 #endif
712 static int __net_init dev_mc_net_init(struct net *net)
714 if (!proc_net_fops_create(net, "dev_mcast", 0, &dev_mc_seq_fops))
715 return -ENOMEM;
716 return 0;
719 static void __net_exit dev_mc_net_exit(struct net *net)
721 proc_net_remove(net, "dev_mcast");
724 static struct pernet_operations __net_initdata dev_mc_net_ops = {
725 .init = dev_mc_net_init,
726 .exit = dev_mc_net_exit,
729 void __init dev_mcast_init(void)
731 register_pernet_subsys(&dev_mc_net_ops);