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
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>
19 * General list handling functions
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
)
26 struct netdev_hw_addr
*ha
;
29 if (addr_len
> MAX_ADDR_LEN
)
32 list_for_each_entry(ha
, &list
->list
, list
) {
33 if (!memcmp(ha
->addr
, addr
, addr_len
) &&
34 ha
->type
== addr_type
) {
36 /* check if addr is already used as global */
40 ha
->global_use
= true;
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
);
54 memcpy(ha
->addr
, addr
, addr_len
);
57 ha
->global_use
= global
;
59 list_add_tail_rcu(&ha
->list
, &list
->list
);
64 static int __hw_addr_add(struct netdev_hw_addr_list
*list
, unsigned char *addr
,
65 int addr_len
, unsigned char addr_type
)
67 return __hw_addr_add_ex(list
, addr
, addr_len
, addr_type
, false);
70 static void ha_rcu_free(struct rcu_head
*head
)
72 struct netdev_hw_addr
*ha
;
74 ha
= container_of(head
, struct netdev_hw_addr
, rcu_head
);
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
)
82 struct netdev_hw_addr
*ha
;
84 list_for_each_entry(ha
, &list
->list
, list
) {
85 if (!memcmp(ha
->addr
, addr
, addr_len
) &&
86 (ha
->type
== addr_type
|| !addr_type
)) {
91 ha
->global_use
= false;
95 list_del_rcu(&ha
->list
);
96 call_rcu(&ha
->rcu_head
, ha_rcu_free
);
104 static int __hw_addr_del(struct netdev_hw_addr_list
*list
, unsigned char *addr
,
105 int addr_len
, unsigned char addr_type
)
107 return __hw_addr_del_ex(list
, addr
, addr_len
, addr_type
, false);
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
)
115 struct netdev_hw_addr
*ha
, *ha2
;
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
);
127 list_for_each_entry(ha2
, &from_list
->list
, list
) {
130 type
= addr_type
? addr_type
: ha2
->type
;
131 __hw_addr_del(to_list
, ha2
->addr
, addr_len
, type
);
135 EXPORT_SYMBOL(__hw_addr_add_multiple
);
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
)
141 struct netdev_hw_addr
*ha
;
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
);
149 EXPORT_SYMBOL(__hw_addr_del_multiple
);
151 int __hw_addr_sync(struct netdev_hw_addr_list
*to_list
,
152 struct netdev_hw_addr_list
*from_list
,
156 struct netdev_hw_addr
*ha
, *tmp
;
158 list_for_each_entry_safe(ha
, tmp
, &from_list
->list
, list
) {
160 err
= __hw_addr_add(to_list
, ha
->addr
,
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
);
173 EXPORT_SYMBOL(__hw_addr_sync
);
175 void __hw_addr_unsync(struct netdev_hw_addr_list
*to_list
,
176 struct netdev_hw_addr_list
*from_list
,
179 struct netdev_hw_addr
*ha
, *tmp
;
181 list_for_each_entry_safe(ha
, tmp
, &from_list
->list
, list
) {
183 __hw_addr_del(to_list
, ha
->addr
,
186 __hw_addr_del(from_list
, ha
->addr
,
191 EXPORT_SYMBOL(__hw_addr_unsync
);
193 void __hw_addr_flush(struct netdev_hw_addr_list
*list
)
195 struct netdev_hw_addr
*ha
, *tmp
;
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
);
203 EXPORT_SYMBOL(__hw_addr_flush
);
205 void __hw_addr_init(struct netdev_hw_addr_list
*list
)
207 INIT_LIST_HEAD(&list
->list
);
210 EXPORT_SYMBOL(__hw_addr_init
);
213 * Device addresses handling functions
217 * dev_addr_flush - Flush device address list
220 * Flush device address list and reset ->dev_addr.
222 * The caller must hold the rtnl_mutex.
224 void dev_addr_flush(struct net_device
*dev
)
226 /* rtnl_mutex must be held here */
228 __hw_addr_flush(&dev
->dev_addrs
);
229 dev
->dev_addr
= NULL
;
231 EXPORT_SYMBOL(dev_addr_flush
);
234 * dev_addr_init - Init device address list
237 * Init device address list and create the first element,
238 * used by ->dev_addr.
240 * The caller must hold the rtnl_mutex.
242 int dev_addr_init(struct net_device
*dev
)
244 unsigned char addr
[MAX_ADDR_LEN
];
245 struct netdev_hw_addr
*ha
;
248 /* rtnl_mutex must be held here */
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
);
256 * Get the first (previously created) address from the list
257 * and set dev_addr pointer to this location.
259 ha
= list_first_entry(&dev
->dev_addrs
.list
,
260 struct netdev_hw_addr
, list
);
261 dev
->dev_addr
= ha
->addr
;
265 EXPORT_SYMBOL(dev_addr_init
);
268 * dev_addr_add - Add a device address
270 * @addr: address to add
271 * @addr_type: address type
273 * Add a device address to the device or increase the reference count if
276 * The caller must hold the rtnl_mutex.
278 int dev_addr_add(struct net_device
*dev
, unsigned char *addr
,
279 unsigned char addr_type
)
285 err
= __hw_addr_add(&dev
->dev_addrs
, addr
, dev
->addr_len
, addr_type
);
287 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
290 EXPORT_SYMBOL(dev_addr_add
);
293 * dev_addr_del - Release a device address.
295 * @addr: address to delete
296 * @addr_type: address type
298 * Release reference to a device address and remove it from the device
299 * if the reference count drops to zero.
301 * The caller must hold the rtnl_mutex.
303 int dev_addr_del(struct net_device
*dev
, unsigned char *addr
,
304 unsigned char addr_type
)
307 struct netdev_hw_addr
*ha
;
312 * We can not remove the first address from the list because
313 * dev->dev_addr points to that.
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)
320 err
= __hw_addr_del(&dev
->dev_addrs
, addr
, dev
->addr_len
,
323 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
326 EXPORT_SYMBOL(dev_addr_del
);
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
334 * Add device addresses of the one device to another.
336 * The caller must hold the rtnl_mutex.
338 int dev_addr_add_multiple(struct net_device
*to_dev
,
339 struct net_device
*from_dev
,
340 unsigned char addr_type
)
346 if (from_dev
->addr_len
!= to_dev
->addr_len
)
348 err
= __hw_addr_add_multiple(&to_dev
->dev_addrs
, &from_dev
->dev_addrs
,
349 to_dev
->addr_len
, addr_type
);
351 call_netdevice_notifiers(NETDEV_CHANGEADDR
, to_dev
);
354 EXPORT_SYMBOL(dev_addr_add_multiple
);
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
362 * Deletes addresses in to device by the list of addresses in from device.
364 * The caller must hold the rtnl_mutex.
366 int dev_addr_del_multiple(struct net_device
*to_dev
,
367 struct net_device
*from_dev
,
368 unsigned char addr_type
)
372 if (from_dev
->addr_len
!= to_dev
->addr_len
)
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
);
379 EXPORT_SYMBOL(dev_addr_del_multiple
);
382 * Unicast list handling functions
386 * dev_uc_add - Add a secondary unicast address
388 * @addr: address to add
390 * Add a secondary unicast address to the device or increase
391 * the reference count if it already exists.
393 int dev_uc_add(struct net_device
*dev
, unsigned char *addr
)
397 netif_addr_lock_bh(dev
);
398 err
= __hw_addr_add(&dev
->uc
, addr
, dev
->addr_len
,
399 NETDEV_HW_ADDR_T_UNICAST
);
401 __dev_set_rx_mode(dev
);
402 netif_addr_unlock_bh(dev
);
405 EXPORT_SYMBOL(dev_uc_add
);
408 * dev_uc_del - Release secondary unicast address.
410 * @addr: address to delete
412 * Release reference to a secondary unicast address and remove it
413 * from the device if the reference count drops to zero.
415 int dev_uc_del(struct net_device
*dev
, unsigned char *addr
)
419 netif_addr_lock_bh(dev
);
420 err
= __hw_addr_del(&dev
->uc
, addr
, dev
->addr_len
,
421 NETDEV_HW_ADDR_T_UNICAST
);
423 __dev_set_rx_mode(dev
);
424 netif_addr_unlock_bh(dev
);
427 EXPORT_SYMBOL(dev_uc_del
);
430 * dev_uc_sync - Synchronize device's unicast list to another device
431 * @to: destination device
432 * @from: source device
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.
438 * This function is intended to be called from the dev->set_rx_mode
439 * function of layered software devices.
441 int dev_uc_sync(struct net_device
*to
, struct net_device
*from
)
445 if (to
->addr_len
!= from
->addr_len
)
448 netif_addr_lock_bh(to
);
449 err
= __hw_addr_sync(&to
->uc
, &from
->uc
, to
->addr_len
);
451 __dev_set_rx_mode(to
);
452 netif_addr_unlock_bh(to
);
455 EXPORT_SYMBOL(dev_uc_sync
);
458 * dev_uc_unsync - Remove synchronized addresses from the destination device
459 * @to: destination device
460 * @from: source device
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.
466 void dev_uc_unsync(struct net_device
*to
, struct net_device
*from
)
468 if (to
->addr_len
!= from
->addr_len
)
471 netif_addr_lock_bh(from
);
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
);
478 EXPORT_SYMBOL(dev_uc_unsync
);
481 * dev_uc_flush - Flush unicast addresses
484 * Flush unicast addresses.
486 void dev_uc_flush(struct net_device
*dev
)
488 netif_addr_lock_bh(dev
);
489 __hw_addr_flush(&dev
->uc
);
490 netif_addr_unlock_bh(dev
);
492 EXPORT_SYMBOL(dev_uc_flush
);
495 * dev_uc_flush - Init unicast address list
498 * Init unicast address list.
500 void dev_uc_init(struct net_device
*dev
)
502 __hw_addr_init(&dev
->uc
);
504 EXPORT_SYMBOL(dev_uc_init
);
507 * Multicast list handling functions
510 static int __dev_mc_add(struct net_device
*dev
, unsigned char *addr
,
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
);
519 __dev_set_rx_mode(dev
);
520 netif_addr_unlock_bh(dev
);
524 * dev_mc_add - Add a multicast address
526 * @addr: address to add
528 * Add a multicast address to the device or increase
529 * the reference count if it already exists.
531 int dev_mc_add(struct net_device
*dev
, unsigned char *addr
)
533 return __dev_mc_add(dev
, addr
, false);
535 EXPORT_SYMBOL(dev_mc_add
);
538 * dev_mc_add_global - Add a global multicast address
540 * @addr: address to add
542 * Add a global multicast address to the device.
544 int dev_mc_add_global(struct net_device
*dev
, unsigned char *addr
)
546 return __dev_mc_add(dev
, addr
, true);
548 EXPORT_SYMBOL(dev_mc_add_global
);
550 static int __dev_mc_del(struct net_device
*dev
, unsigned char *addr
,
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
);
559 __dev_set_rx_mode(dev
);
560 netif_addr_unlock_bh(dev
);
565 * dev_mc_del - Delete a multicast address.
567 * @addr: address to delete
569 * Release reference to a multicast address and remove it
570 * from the device if the reference count drops to zero.
572 int dev_mc_del(struct net_device
*dev
, unsigned char *addr
)
574 return __dev_mc_del(dev
, addr
, false);
576 EXPORT_SYMBOL(dev_mc_del
);
579 * dev_mc_del_global - Delete a global multicast address.
581 * @addr: address to delete
583 * Release reference to a multicast address and remove it
584 * from the device if the reference count drops to zero.
586 int dev_mc_del_global(struct net_device
*dev
, unsigned char *addr
)
588 return __dev_mc_del(dev
, addr
, true);
590 EXPORT_SYMBOL(dev_mc_del_global
);
593 * dev_mc_sync - Synchronize device's unicast list to another device
594 * @to: destination device
595 * @from: source device
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.
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.
604 int dev_mc_sync(struct net_device
*to
, struct net_device
*from
)
608 if (to
->addr_len
!= from
->addr_len
)
611 netif_addr_lock_bh(to
);
612 err
= __hw_addr_sync(&to
->mc
, &from
->mc
, to
->addr_len
);
614 __dev_set_rx_mode(to
);
615 netif_addr_unlock_bh(to
);
618 EXPORT_SYMBOL(dev_mc_sync
);
621 * dev_mc_unsync - Remove synchronized addresses from the destination device
622 * @to: destination device
623 * @from: source device
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.
629 void dev_mc_unsync(struct net_device
*to
, struct net_device
*from
)
631 if (to
->addr_len
!= from
->addr_len
)
634 netif_addr_lock_bh(from
);
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
);
641 EXPORT_SYMBOL(dev_mc_unsync
);
644 * dev_mc_flush - Flush multicast addresses
647 * Flush multicast addresses.
649 void dev_mc_flush(struct net_device
*dev
)
651 netif_addr_lock_bh(dev
);
652 __hw_addr_flush(&dev
->mc
);
653 netif_addr_unlock_bh(dev
);
655 EXPORT_SYMBOL(dev_mc_flush
);
658 * dev_mc_flush - Init multicast address list
661 * Init multicast address list.
663 void dev_mc_init(struct net_device
*dev
)
665 __hw_addr_init(&dev
->mc
);
667 EXPORT_SYMBOL(dev_mc_init
);
669 #ifdef CONFIG_PROC_FS
670 #include <linux/proc_fs.h>
671 #include <linux/seq_file.h>
673 static int dev_mc_seq_show(struct seq_file
*seq
, void *v
)
675 struct netdev_hw_addr
*ha
;
676 struct net_device
*dev
= v
;
678 if (v
== SEQ_START_TOKEN
)
681 netif_addr_lock_bh(dev
);
682 netdev_for_each_mc_addr(ha
, dev
) {
685 seq_printf(seq
, "%-4d %-15s %-5d %-5d ", dev
->ifindex
,
686 dev
->name
, ha
->refcount
, ha
->global_use
);
688 for (i
= 0; i
< dev
->addr_len
; i
++)
689 seq_printf(seq
, "%02x", ha
->addr
[i
]);
693 netif_addr_unlock_bh(dev
);
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
,
704 static int dev_mc_seq_open(struct inode
*inode
, struct file
*file
)
706 return seq_open_net(inode
, file
, &dev_mc_seq_ops
,
707 sizeof(struct seq_net_private
));
710 static const struct file_operations dev_mc_seq_fops
= {
711 .owner
= THIS_MODULE
,
712 .open
= dev_mc_seq_open
,
715 .release
= seq_release_net
,
720 static int __net_init
dev_mc_net_init(struct net
*net
)
722 if (!proc_net_fops_create(net
, "dev_mcast", 0, &dev_mc_seq_fops
))
727 static void __net_exit
dev_mc_net_exit(struct net
*net
)
729 proc_net_remove(net
, "dev_mcast");
732 static struct pernet_operations __net_initdata dev_mc_net_ops
= {
733 .init
= dev_mc_net_init
,
734 .exit
= dev_mc_net_exit
,
737 void __init
dev_mcast_init(void)
739 register_pernet_subsys(&dev_mc_net_ops
);