[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / x25 / x25_link.c

/*
 *	X.25 Packet Layer release 002
 *
 *	This is ALPHA test software. This code may break your machine,
 *	randomly fail to work with new releases, misbehave and/or generally
 *	screw up. It might even work.
 *
 *	This code REQUIRES 2.1.15 or higher
 *
 *	This module:
 *		This module is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 *	History
 *	X.25 001	Jonathan Naylor	  Started coding.
 *	X.25 002	Jonathan Naylor	  New timer architecture.
 *	mar/20/00	Daniela Squassoni Disabling/enabling of facilities
 *					  negotiation.
 *	2000-09-04	Henner Eisen	  dev_hold() / dev_put() for x25_neigh.
 */

#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <asm/uaccess.h>
#include <linux/init.h>
#include <net/x25.h>

static LIST_HEAD(x25_neigh_list);
static DEFINE_RWLOCK(x25_neigh_list_lock);

static void x25_t20timer_expiry(unsigned long);

static void x25_transmit_restart_confirmation(struct x25_neigh *nb);
static void x25_transmit_restart_request(struct x25_neigh *nb);

/*
 *	Linux set/reset timer routines
 */
static inline void x25_start_t20timer(struct x25_neigh *nb)
{
	mod_timer(&nb->t20timer, jiffies + nb->t20);
}

static void x25_t20timer_expiry(unsigned long param)
{
	struct x25_neigh *nb = (struct x25_neigh *)param;

	x25_transmit_restart_request(nb);

	x25_start_t20timer(nb);
}

static inline void x25_stop_t20timer(struct x25_neigh *nb)
{
	del_timer(&nb->t20timer);
}

static inline int x25_t20timer_pending(struct x25_neigh *nb)
{
	return timer_pending(&nb->t20timer);
}

/*
 *	This handles all restart and diagnostic frames.
 */
void x25_link_control(struct sk_buff *skb, struct x25_neigh *nb,
		      unsigned short frametype)
{
	struct sk_buff *skbn;
	int confirm;

	switch (frametype) {
		case X25_RESTART_REQUEST:
			confirm = !x25_t20timer_pending(nb);
			x25_stop_t20timer(nb);
			nb->state = X25_LINK_STATE_3;
			if (confirm)
				x25_transmit_restart_confirmation(nb);
			break;

		case X25_RESTART_CONFIRMATION:
			x25_stop_t20timer(nb);
			nb->state = X25_LINK_STATE_3;
			break;

		case X25_DIAGNOSTIC:
			printk(KERN_WARNING "x25: diagnostic #%d - "
			       "%02X %02X %02X\n",
			       skb->data[3], skb->data[4],
			       skb->data[5], skb->data[6]);
			break;

		default:
			printk(KERN_WARNING "x25: received unknown %02X "
			       "with LCI 000\n", frametype);
			break;
	}

	if (nb->state == X25_LINK_STATE_3)
		while ((skbn = skb_dequeue(&nb->queue)) != NULL)
			x25_send_frame(skbn, nb);
}

/*
 *	This routine is called when a Restart Request is needed
 */
static void x25_transmit_restart_request(struct x25_neigh *nb)
{
	unsigned char *dptr;
	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN + 2;
	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);

	if (!skb)
		return;

	skb_reserve(skb, X25_MAX_L2_LEN);

	dptr = skb_put(skb, X25_STD_MIN_LEN + 2);

	*dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ;
	*dptr++ = 0x00;
	*dptr++ = X25_RESTART_REQUEST;
	*dptr++ = 0x00;
	*dptr++ = 0;

	skb->sk = NULL;

	x25_send_frame(skb, nb);
}

/*
 * This routine is called when a Restart Confirmation is needed
 */
static void x25_transmit_restart_confirmation(struct x25_neigh *nb)
{
	unsigned char *dptr;
	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN;
	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);

	if (!skb)
		return;

	skb_reserve(skb, X25_MAX_L2_LEN);

	dptr = skb_put(skb, X25_STD_MIN_LEN);

	*dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ;
	*dptr++ = 0x00;
	*dptr++ = X25_RESTART_CONFIRMATION;

	skb->sk = NULL;

	x25_send_frame(skb, nb);
}

/*
 *	This routine is called when a Clear Request is needed outside of the context
 *	of a connected socket.
 */
void x25_transmit_clear_request(struct x25_neigh *nb, unsigned int lci,
				unsigned char cause)
{
	unsigned char *dptr;
	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN + 2;
	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);

	if (!skb)
		return;

	skb_reserve(skb, X25_MAX_L2_LEN);

	dptr = skb_put(skb, X25_STD_MIN_LEN + 2);

	*dptr++ = ((lci >> 8) & 0x0F) | (nb->extended ?
					 X25_GFI_EXTSEQ :
					 X25_GFI_STDSEQ);
	*dptr++ = (lci >> 0) & 0xFF;
	*dptr++ = X25_CLEAR_REQUEST;
	*dptr++ = cause;
	*dptr++ = 0x00;

	skb->sk = NULL;

	x25_send_frame(skb, nb);
}

void x25_transmit_link(struct sk_buff *skb, struct x25_neigh *nb)
{
	switch (nb->state) {
		case X25_LINK_STATE_0:
			skb_queue_tail(&nb->queue, skb);
			nb->state = X25_LINK_STATE_1;
			x25_establish_link(nb);
			break;
		case X25_LINK_STATE_1:
		case X25_LINK_STATE_2:
			skb_queue_tail(&nb->queue, skb);
			break;
		case X25_LINK_STATE_3:
			x25_send_frame(skb, nb);
			break;
	}
}

/*
 *	Called when the link layer has become established.
 */
void x25_link_established(struct x25_neigh *nb)
{
	switch (nb->state) {
		case X25_LINK_STATE_0:
			nb->state = X25_LINK_STATE_2;
			break;
		case X25_LINK_STATE_1:
			x25_transmit_restart_request(nb);
			nb->state = X25_LINK_STATE_2;
			x25_start_t20timer(nb);
			break;
	}
}

/*
 *	Called when the link layer has terminated, or an establishment
 *	request has failed.
 */

void x25_link_terminated(struct x25_neigh *nb)
{
	nb->state = X25_LINK_STATE_0;
	/* Out of order: clear existing virtual calls (X.25 03/93 4.6.3) */
	x25_kill_by_neigh(nb);
}

/*
 *	Add a new device.
 */
void x25_link_device_up(struct net_device *dev)
{
	struct x25_neigh *nb = kmalloc(sizeof(*nb), GFP_ATOMIC);

	if (!nb)
		return;

	skb_queue_head_init(&nb->queue);
	setup_timer(&nb->t20timer, x25_t20timer_expiry, (unsigned long)nb);

	dev_hold(dev);
	nb->dev      = dev;
	nb->state    = X25_LINK_STATE_0;
	nb->extended = 0;
	/*
	 * Enables negotiation
	 */
	nb->global_facil_mask = X25_MASK_REVERSE |
				       X25_MASK_THROUGHPUT |
				       X25_MASK_PACKET_SIZE |
				       X25_MASK_WINDOW_SIZE;
	nb->t20      = sysctl_x25_restart_request_timeout;
	atomic_set(&nb->refcnt, 1);

	write_lock_bh(&x25_neigh_list_lock);
	list_add(&nb->node, &x25_neigh_list);
	write_unlock_bh(&x25_neigh_list_lock);
}

/**
 *	__x25_remove_neigh - remove neighbour from x25_neigh_list
 *	@nb - neigh to remove
 *
 *	Remove neighbour from x25_neigh_list. If it was there.
 *	Caller must hold x25_neigh_list_lock.
 */
static void __x25_remove_neigh(struct x25_neigh *nb)
{
	skb_queue_purge(&nb->queue);
	x25_stop_t20timer(nb);

	if (nb->node.next) {
		list_del(&nb->node);
		x25_neigh_put(nb);
	}
}

/*
 *	A device has been removed, remove its links.
 */
void x25_link_device_down(struct net_device *dev)
{
	struct x25_neigh *nb;
	struct list_head *entry, *tmp;

	write_lock_bh(&x25_neigh_list_lock);

	list_for_each_safe(entry, tmp, &x25_neigh_list) {
		nb = list_entry(entry, struct x25_neigh, node);

		if (nb->dev == dev) {
			__x25_remove_neigh(nb);
			dev_put(dev);
		}
	}

	write_unlock_bh(&x25_neigh_list_lock);
}

/*
 *	Given a device, return the neighbour address.
 */
struct x25_neigh *x25_get_neigh(struct net_device *dev)
{
	struct x25_neigh *nb, *use = NULL;
	struct list_head *entry;

	read_lock_bh(&x25_neigh_list_lock);
	list_for_each(entry, &x25_neigh_list) {
		nb = list_entry(entry, struct x25_neigh, node);

		if (nb->dev == dev) {
			use = nb;
			break;
		}
	}

	if (use)
		x25_neigh_hold(use);
	read_unlock_bh(&x25_neigh_list_lock);
	return use;
}

/*
 *	Handle the ioctls that control the subscription functions.
 */
int x25_subscr_ioctl(unsigned int cmd, void __user *arg)
{
	struct x25_subscrip_struct x25_subscr;
	struct x25_neigh *nb;
	struct net_device *dev;
	int rc = -EINVAL;

	if (cmd != SIOCX25GSUBSCRIP && cmd != SIOCX25SSUBSCRIP)
		goto out;

	rc = -EFAULT;
	if (copy_from_user(&x25_subscr, arg, sizeof(x25_subscr)))
		goto out;

	rc = -EINVAL;
	if ((dev = x25_dev_get(x25_subscr.device)) == NULL)
		goto out;

	if ((nb = x25_get_neigh(dev)) == NULL)
		goto out_dev_put;

	dev_put(dev);

	if (cmd == SIOCX25GSUBSCRIP) {
		x25_subscr.extended	     = nb->extended;
		x25_subscr.global_facil_mask = nb->global_facil_mask;
		rc = copy_to_user(arg, &x25_subscr,
				  sizeof(x25_subscr)) ? -EFAULT : 0;
	} else {
		rc = -EINVAL;
		if (!(x25_subscr.extended && x25_subscr.extended != 1)) {
			rc = 0;
			nb->extended	     = x25_subscr.extended;
			nb->global_facil_mask = x25_subscr.global_facil_mask;
		}
	}
	x25_neigh_put(nb);
out:
	return rc;
out_dev_put:
	dev_put(dev);
	goto out;
}


/*
 *	Release all memory associated with X.25 neighbour structures.
 */
void __exit x25_link_free(void)
{
	struct x25_neigh *nb;
	struct list_head *entry, *tmp;

	write_lock_bh(&x25_neigh_list_lock);

	list_for_each_safe(entry, tmp, &x25_neigh_list) {
		nb = list_entry(entry, struct x25_neigh, node);
		__x25_remove_neigh(nb);
	}
	write_unlock_bh(&x25_neigh_list_lock);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* X.25 Packet Layer release 002
	3	*
	4	* This is ALPHA test software. This code may break your machine,
	5	* randomly fail to work with new releases, misbehave and/or generally
f8e1d201	6	* screw up. It might even work.
1da177e4 LT	7	*
	8	* This code REQUIRES 2.1.15 or higher
	9	*
	10	* This module:
	11	* This module is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* as published by the Free Software Foundation; either version
	14	* 2 of the License, or (at your option) any later version.
	15	*
	16	* History
	17	* X.25 001 Jonathan Naylor Started coding.
	18	* X.25 002 Jonathan Naylor New timer architecture.
f8e1d201	19	* mar/20/00 Daniela Squassoni Disabling/enabling of facilities
1da177e4 LT	20	* negotiation.
	21	* 2000-09-04 Henner Eisen dev_hold() / dev_put() for x25_neigh.
	22	*/
	23
	24	#include <linux/kernel.h>
	25	#include <linux/jiffies.h>
	26	#include <linux/timer.h>
5a0e3ad6	27	#include <linux/slab.h>
1da177e4 LT	28	#include <linux/netdevice.h>
	29	#include <linux/skbuff.h>
	30	#include <asm/uaccess.h>
	31	#include <linux/init.h>
	32	#include <net/x25.h>
	33
0e3cf7e9	34	static LIST_HEAD(x25_neigh_list);
1da177e4 LT	35	static DEFINE_RWLOCK(x25_neigh_list_lock);
	36
	37	static void x25_t20timer_expiry(unsigned long);
	38
	39	static void x25_transmit_restart_confirmation(struct x25_neigh *nb);
	40	static void x25_transmit_restart_request(struct x25_neigh *nb);
	41
	42	/*
	43	* Linux set/reset timer routines
	44	*/
	45	static inline void x25_start_t20timer(struct x25_neigh *nb)
	46	{
	47	mod_timer(&nb->t20timer, jiffies + nb->t20);
	48	}
	49
	50	static void x25_t20timer_expiry(unsigned long param)
	51	{
	52	struct x25_neigh nb = (struct x25_neigh )param;
	53
	54	x25_transmit_restart_request(nb);
	55
	56	x25_start_t20timer(nb);
	57	}
	58
	59	static inline void x25_stop_t20timer(struct x25_neigh *nb)
	60	{
	61	del_timer(&nb->t20timer);
	62	}
	63
	64	static inline int x25_t20timer_pending(struct x25_neigh *nb)
	65	{
	66	return timer_pending(&nb->t20timer);
	67	}
	68
	69	/*
	70	* This handles all restart and diagnostic frames.
	71	*/
	72	void x25_link_control(struct sk_buff skb, struct x25_neigh nb,
	73	unsigned short frametype)
	74	{
	75	struct sk_buff *skbn;
	76	int confirm;
	77
	78	switch (frametype) {
	79	case X25_RESTART_REQUEST:
	80	confirm = !x25_t20timer_pending(nb);
	81	x25_stop_t20timer(nb);
	82	nb->state = X25_LINK_STATE_3;
	83	if (confirm)
	84	x25_transmit_restart_confirmation(nb);
	85	break;
	86
	87	case X25_RESTART_CONFIRMATION:
	88	x25_stop_t20timer(nb);
	89	nb->state = X25_LINK_STATE_3;
	90	break;
	91
	92	case X25_DIAGNOSTIC:
	93	printk(KERN_WARNING "x25: diagnostic #%d - "
	94	"%02X %02X %02X\n",
	95	skb->data[3], skb->data[4],
	96	skb->data[5], skb->data[6]);
	97	break;
f8e1d201	98
1da177e4 LT	99	default:
	100	printk(KERN_WARNING "x25: received unknown %02X "
	101	"with LCI 000\n", frametype);
	102	break;
	103	}
	104
	105	if (nb->state == X25_LINK_STATE_3)
	106	while ((skbn = skb_dequeue(&nb->queue)) != NULL)
	107	x25_send_frame(skbn, nb);
	108	}
	109
	110	/*
	111	* This routine is called when a Restart Request is needed
	112	*/
	113	static void x25_transmit_restart_request(struct x25_neigh *nb)
	114	{
	115	unsigned char *dptr;
	116	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN + 2;
	117	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
	118
	119	if (!skb)
	120	return;
	121
	122	skb_reserve(skb, X25_MAX_L2_LEN);
	123
	124	dptr = skb_put(skb, X25_STD_MIN_LEN + 2);
	125
	126	*dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ;
	127	*dptr++ = 0x00;
	128	*dptr++ = X25_RESTART_REQUEST;
	129	*dptr++ = 0x00;
	130	*dptr++ = 0;
	131
	132	skb->sk = NULL;
	133
	134	x25_send_frame(skb, nb);
	135	}
	136
	137	/*
	138	* This routine is called when a Restart Confirmation is needed
	139	*/
	140	static void x25_transmit_restart_confirmation(struct x25_neigh *nb)
	141	{
	142	unsigned char *dptr;
	143	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN;
	144	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
	145
	146	if (!skb)
	147	return;
	148
	149	skb_reserve(skb, X25_MAX_L2_LEN);
	150
	151	dptr = skb_put(skb, X25_STD_MIN_LEN);
	152
	153	*dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ;
	154	*dptr++ = 0x00;
	155	*dptr++ = X25_RESTART_CONFIRMATION;
	156
	157	skb->sk = NULL;
	158
	159	x25_send_frame(skb, nb);
	160	}
	161
	162	/*
163	* This routine is called when a Clear Request is needed outside of the context
164	* of a connected socket.
165	*/
166	void x25_transmit_clear_request(struct x25_neigh *nb, unsigned int lci,
167	unsigned char cause)
168	{
169	unsigned char *dptr;
170	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN + 2;
171	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
172
173	if (!skb)
174	return;
175
176	skb_reserve(skb, X25_MAX_L2_LEN);
177
178	dptr = skb_put(skb, X25_STD_MIN_LEN + 2);
179
180	*dptr++ = ((lci >> 8) & 0x0F) \| (nb->extended ?
181	X25_GFI_EXTSEQ :
182	X25_GFI_STDSEQ);
183	*dptr++ = (lci >> 0) & 0xFF;
184	*dptr++ = X25_CLEAR_REQUEST;
185	*dptr++ = cause;
186	*dptr++ = 0x00;
187
188	skb->sk = NULL;
189
190	x25_send_frame(skb, nb);
191	}
192
193	void x25_transmit_link(struct sk_buff skb, struct x25_neigh nb)
194	{
195	switch (nb->state) {
196	case X25_LINK_STATE_0:
197	skb_queue_tail(&nb->queue, skb);
198	nb->state = X25_LINK_STATE_1;
199	x25_establish_link(nb);
200	break;
201	case X25_LINK_STATE_1:
202	case X25_LINK_STATE_2:
203	skb_queue_tail(&nb->queue, skb);
204	break;
205	case X25_LINK_STATE_3:
206	x25_send_frame(skb, nb);
207	break;
208	}
209	}
210
211	/*
212	* Called when the link layer has become established.
213	*/
214	void x25_link_established(struct x25_neigh *nb)
215	{
216	switch (nb->state) {
217	case X25_LINK_STATE_0:
218	nb->state = X25_LINK_STATE_2;
219	break;
220	case X25_LINK_STATE_1:
221	x25_transmit_restart_request(nb);
222	nb->state = X25_LINK_STATE_2;
223	x25_start_t20timer(nb);
224	break;
225	}
226	}
227
228	/*
229	* Called when the link layer has terminated, or an establishment
230	* request has failed.
231	*/
232
233	void x25_link_terminated(struct x25_neigh *nb)
234	{
235	nb->state = X25_LINK_STATE_0;
236	/* Out of order: clear existing virtual calls (X.25 03/93 4.6.3) */
237	x25_kill_by_neigh(nb);
238	}
239
240	/*
241	* Add a new device.
242	*/
243	void x25_link_device_up(struct net_device *dev)
244	{
245	struct x25_neigh nb = kmalloc(sizeof(nb), GFP_ATOMIC);
246
247	if (!nb)
248	return;
249
250	skb_queue_head_init(&nb->queue);
b24b8a24	251	setup_timer(&nb->t20timer, x25_t20timer_expiry, (unsigned long)nb);
1da177e4 LT	252
	253	dev_hold(dev);
	254	nb->dev = dev;
	255	nb->state = X25_LINK_STATE_0;
	256	nb->extended = 0;
	257	/*
	258	* Enables negotiation
	259	*/
	260	nb->global_facil_mask = X25_MASK_REVERSE \|
	261	X25_MASK_THROUGHPUT \|
	262	X25_MASK_PACKET_SIZE \|
	263	X25_MASK_WINDOW_SIZE;
	264	nb->t20 = sysctl_x25_restart_request_timeout;
	265	atomic_set(&nb->refcnt, 1);
	266
	267	write_lock_bh(&x25_neigh_list_lock);
	268	list_add(&nb->node, &x25_neigh_list);
	269	write_unlock_bh(&x25_neigh_list_lock);
	270	}
	271
	272	/**
	273	* __x25_remove_neigh - remove neighbour from x25_neigh_list
	274	* @nb - neigh to remove
	275	*
	276	* Remove neighbour from x25_neigh_list. If it was there.
	277	* Caller must hold x25_neigh_list_lock.
	278	*/
	279	static void __x25_remove_neigh(struct x25_neigh *nb)
	280	{
	281	skb_queue_purge(&nb->queue);
	282	x25_stop_t20timer(nb);
	283
	284	if (nb->node.next) {
	285	list_del(&nb->node);
	286	x25_neigh_put(nb);
	287	}
	288	}
	289
	290	/*
	291	* A device has been removed, remove its links.
	292	*/
	293	void x25_link_device_down(struct net_device *dev)
	294	{
	295	struct x25_neigh *nb;
	296	struct list_head entry, tmp;
	297
	298	write_lock_bh(&x25_neigh_list_lock);
	299
	300	list_for_each_safe(entry, tmp, &x25_neigh_list) {
	301	nb = list_entry(entry, struct x25_neigh, node);
	302
	303	if (nb->dev == dev) {
	304	__x25_remove_neigh(nb);
	305	dev_put(dev);
	306	}
	307	}
	308
	309	write_unlock_bh(&x25_neigh_list_lock);
	310	}
	311
	312	/*
	313	* Given a device, return the neighbour address.
	314	*/
	315	struct x25_neigh x25_get_neigh(struct net_device dev)
316	{
317	struct x25_neigh nb, use = NULL;
318	struct list_head *entry;
319
320	read_lock_bh(&x25_neigh_list_lock);
321	list_for_each(entry, &x25_neigh_list) {
322	nb = list_entry(entry, struct x25_neigh, node);
323
324	if (nb->dev == dev) {
325	use = nb;
326	break;
327	}
328	}
329
330	if (use)
331	x25_neigh_hold(use);
332	read_unlock_bh(&x25_neigh_list_lock);
333	return use;
334	}
335
336	/*
337	* Handle the ioctls that control the subscription functions.
338	*/
339	int x25_subscr_ioctl(unsigned int cmd, void __user *arg)
340	{
341	struct x25_subscrip_struct x25_subscr;
342	struct x25_neigh *nb;
343	struct net_device *dev;
344	int rc = -EINVAL;
345
346	if (cmd != SIOCX25GSUBSCRIP && cmd != SIOCX25SSUBSCRIP)
347	goto out;
348
349	rc = -EFAULT;
350	if (copy_from_user(&x25_subscr, arg, sizeof(x25_subscr)))
351	goto out;
352
353	rc = -EINVAL;
354	if ((dev = x25_dev_get(x25_subscr.device)) == NULL)
355	goto out;
356
357	if ((nb = x25_get_neigh(dev)) == NULL)
358	goto out_dev_put;
359
360	dev_put(dev);
361
362	if (cmd == SIOCX25GSUBSCRIP) {
363	x25_subscr.extended = nb->extended;
364	x25_subscr.global_facil_mask = nb->global_facil_mask;
365	rc = copy_to_user(arg, &x25_subscr,
366	sizeof(x25_subscr)) ? -EFAULT : 0;
367	} else {
368	rc = -EINVAL;
369	if (!(x25_subscr.extended && x25_subscr.extended != 1)) {
370	rc = 0;
371	nb->extended = x25_subscr.extended;
372	nb->global_facil_mask = x25_subscr.global_facil_mask;
373	}
374	}
375	x25_neigh_put(nb);
376	out:
377	return rc;
378	out_dev_put:
379	dev_put(dev);
380	goto out;
381	}
382
383
384	/*
385	* Release all memory associated with X.25 neighbour structures.
386	*/
387	void __exit x25_link_free(void)
388	{
389	struct x25_neigh *nb;
390	struct list_head entry, tmp;
391
392	write_lock_bh(&x25_neigh_list_lock);
393
394	list_for_each_safe(entry, tmp, &x25_neigh_list) {
395	nb = list_entry(entry, struct x25_neigh, node);
396	__x25_remove_neigh(nb);
397	}
398	write_unlock_bh(&x25_neigh_list_lock);
399	}