[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>

LIST_HEAD(x25_neigh_list);
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:
		if (!pskb_may_pull(skb, X25_STD_MIN_LEN + 4))
			break;

		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) {
		read_lock_bh(&x25_neigh_list_lock);
		x25_subscr.extended	     = nb->extended;
		x25_subscr.global_facil_mask = nb->global_facil_mask;
		read_unlock_bh(&x25_neigh_list_lock);
		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;
			write_lock_bh(&x25_neigh_list_lock);
			nb->extended	     = x25_subscr.extended;
			nb->global_facil_mask = x25_subscr.global_facil_mask;
			write_unlock_bh(&x25_neigh_list_lock);
		}
	}
	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) {
		struct net_device *dev;

		nb = list_entry(entry, struct x25_neigh, node);
		dev = nb->dev;
		__x25_remove_neigh(nb);
		dev_put(dev);
	}
	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
5595a1a5	34	LIST_HEAD(x25_neigh_list);
5595a1a5	35	DEFINE_RWLOCK(x25_neigh_list_lock);
1da177e4 LT	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) {
fddc5f3e JP	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:
cb101ed2 MD	93	if (!pskb_may_pull(skb, X25_STD_MIN_LEN + 4))
	94	break;
	95
fddc5f3e JP	96	printk(KERN_WARNING "x25: diagnostic #%d - %02X %02X %02X\n",
	97	skb->data[3], skb->data[4],
	98	skb->data[5], skb->data[6]);
	99	break;
	100
	101	default:
	102	printk(KERN_WARNING "x25: received unknown %02X with LCI 000\n",
	103	frametype);
	104	break;
1da177e4 LT	105	}
	106
	107	if (nb->state == X25_LINK_STATE_3)
	108	while ((skbn = skb_dequeue(&nb->queue)) != NULL)
	109	x25_send_frame(skbn, nb);
	110	}
	111
	112	/*
	113	* This routine is called when a Restart Request is needed
	114	*/
	115	static void x25_transmit_restart_request(struct x25_neigh *nb)
	116	{
	117	unsigned char *dptr;
	118	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN + 2;
	119	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
	120
	121	if (!skb)
	122	return;
	123
	124	skb_reserve(skb, X25_MAX_L2_LEN);
	125
	126	dptr = skb_put(skb, X25_STD_MIN_LEN + 2);
	127
	128	*dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ;
	129	*dptr++ = 0x00;
	130	*dptr++ = X25_RESTART_REQUEST;
	131	*dptr++ = 0x00;
	132	*dptr++ = 0;
	133
	134	skb->sk = NULL;
	135
	136	x25_send_frame(skb, nb);
	137	}
	138
	139	/*
	140	* This routine is called when a Restart Confirmation is needed
	141	*/
	142	static void x25_transmit_restart_confirmation(struct x25_neigh *nb)
	143	{
	144	unsigned char *dptr;
	145	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN;
	146	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
	147
	148	if (!skb)
	149	return;
	150
	151	skb_reserve(skb, X25_MAX_L2_LEN);
	152
	153	dptr = skb_put(skb, X25_STD_MIN_LEN);
	154
	155	*dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ;
	156	*dptr++ = 0x00;
	157	*dptr++ = X25_RESTART_CONFIRMATION;
	158
	159	skb->sk = NULL;
	160
	161	x25_send_frame(skb, nb);
	162	}
	163
	164	/*
	165	* This routine is called when a Clear Request is needed outside of the context
	166	* of a connected socket.
	167	*/
	168	void x25_transmit_clear_request(struct x25_neigh *nb, unsigned int lci,
169	unsigned char cause)
170	{
171	unsigned char *dptr;
172	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN + 2;
173	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
174
175	if (!skb)
176	return;
177
178	skb_reserve(skb, X25_MAX_L2_LEN);
179
180	dptr = skb_put(skb, X25_STD_MIN_LEN + 2);
181
182	*dptr++ = ((lci >> 8) & 0x0F) \| (nb->extended ?
183	X25_GFI_EXTSEQ :
184	X25_GFI_STDSEQ);
185	*dptr++ = (lci >> 0) & 0xFF;
186	*dptr++ = X25_CLEAR_REQUEST;
187	*dptr++ = cause;
188	*dptr++ = 0x00;
189
190	skb->sk = NULL;
191
192	x25_send_frame(skb, nb);
193	}
194
195	void x25_transmit_link(struct sk_buff skb, struct x25_neigh nb)
196	{
197	switch (nb->state) {
fddc5f3e JP	198	case X25_LINK_STATE_0:
	199	skb_queue_tail(&nb->queue, skb);
	200	nb->state = X25_LINK_STATE_1;
	201	x25_establish_link(nb);
	202	break;
	203	case X25_LINK_STATE_1:
	204	case X25_LINK_STATE_2:
	205	skb_queue_tail(&nb->queue, skb);
	206	break;
	207	case X25_LINK_STATE_3:
	208	x25_send_frame(skb, nb);
	209	break;
1da177e4 LT	210	}
	211	}
	212
	213	/*
	214	* Called when the link layer has become established.
	215	*/
	216	void x25_link_established(struct x25_neigh *nb)
	217	{
	218	switch (nb->state) {
fddc5f3e JP	219	case X25_LINK_STATE_0:
	220	nb->state = X25_LINK_STATE_2;
	221	break;
	222	case X25_LINK_STATE_1:
	223	x25_transmit_restart_request(nb);
	224	nb->state = X25_LINK_STATE_2;
	225	x25_start_t20timer(nb);
	226	break;
1da177e4 LT	227	}
	228	}
	229
	230	/*
	231	* Called when the link layer has terminated, or an establishment
	232	* request has failed.
	233	*/
	234
	235	void x25_link_terminated(struct x25_neigh *nb)
	236	{
	237	nb->state = X25_LINK_STATE_0;
	238	/* Out of order: clear existing virtual calls (X.25 03/93 4.6.3) */
	239	x25_kill_by_neigh(nb);
	240	}
	241
	242	/*
	243	* Add a new device.
	244	*/
	245	void x25_link_device_up(struct net_device *dev)
	246	{
	247	struct x25_neigh nb = kmalloc(sizeof(nb), GFP_ATOMIC);
	248
	249	if (!nb)
	250	return;
	251
	252	skb_queue_head_init(&nb->queue);
b24b8a24	253	setup_timer(&nb->t20timer, x25_t20timer_expiry, (unsigned long)nb);
1da177e4 LT	254
	255	dev_hold(dev);
	256	nb->dev = dev;
	257	nb->state = X25_LINK_STATE_0;
	258	nb->extended = 0;
	259	/*
	260	* Enables negotiation
	261	*/
	262	nb->global_facil_mask = X25_MASK_REVERSE \|
	263	X25_MASK_THROUGHPUT \|
	264	X25_MASK_PACKET_SIZE \|
	265	X25_MASK_WINDOW_SIZE;
	266	nb->t20 = sysctl_x25_restart_request_timeout;
	267	atomic_set(&nb->refcnt, 1);
	268
	269	write_lock_bh(&x25_neigh_list_lock);
	270	list_add(&nb->node, &x25_neigh_list);
	271	write_unlock_bh(&x25_neigh_list_lock);
	272	}
	273
	274	/**
	275	* __x25_remove_neigh - remove neighbour from x25_neigh_list
	276	* @nb - neigh to remove
	277	*
	278	* Remove neighbour from x25_neigh_list. If it was there.
	279	* Caller must hold x25_neigh_list_lock.
	280	*/
	281	static void __x25_remove_neigh(struct x25_neigh *nb)
	282	{
	283	skb_queue_purge(&nb->queue);
	284	x25_stop_t20timer(nb);
	285
	286	if (nb->node.next) {
	287	list_del(&nb->node);
	288	x25_neigh_put(nb);
	289	}
	290	}
	291
	292	/*
	293	* A device has been removed, remove its links.
	294	*/
	295	void x25_link_device_down(struct net_device *dev)
	296	{
	297	struct x25_neigh *nb;
	298	struct list_head entry, tmp;
	299
	300	write_lock_bh(&x25_neigh_list_lock);
	301
	302	list_for_each_safe(entry, tmp, &x25_neigh_list) {
	303	nb = list_entry(entry, struct x25_neigh, node);
	304
	305	if (nb->dev == dev) {
	306	__x25_remove_neigh(nb);
	307	dev_put(dev);
	308	}
	309	}
	310
	311	write_unlock_bh(&x25_neigh_list_lock);
	312	}
	313
	314	/*
	315	* Given a device, return the neighbour address.
	316	*/
	317	struct x25_neigh x25_get_neigh(struct net_device dev)
318	{
319	struct x25_neigh nb, use = NULL;
320	struct list_head *entry;
321
322	read_lock_bh(&x25_neigh_list_lock);
323	list_for_each(entry, &x25_neigh_list) {
324	nb = list_entry(entry, struct x25_neigh, node);
325
326	if (nb->dev == dev) {
327	use = nb;
328	break;
329	}
330	}
331
332	if (use)
333	x25_neigh_hold(use);
334	read_unlock_bh(&x25_neigh_list_lock);
335	return use;
336	}
337
338	/*
339	* Handle the ioctls that control the subscription functions.
340	*/
341	int x25_subscr_ioctl(unsigned int cmd, void __user *arg)
342	{
343	struct x25_subscrip_struct x25_subscr;
344	struct x25_neigh *nb;
345	struct net_device *dev;
346	int rc = -EINVAL;
347
348	if (cmd != SIOCX25GSUBSCRIP && cmd != SIOCX25SSUBSCRIP)
349	goto out;
350
351	rc = -EFAULT;
352	if (copy_from_user(&x25_subscr, arg, sizeof(x25_subscr)))
353	goto out;
354
355	rc = -EINVAL;
356	if ((dev = x25_dev_get(x25_subscr.device)) == NULL)
357	goto out;
358
359	if ((nb = x25_get_neigh(dev)) == NULL)
360	goto out_dev_put;
361
362	dev_put(dev);
363
364	if (cmd == SIOCX25GSUBSCRIP) {
5595a1a5	365	read_lock_bh(&x25_neigh_list_lock);
1da177e4 LT	366	x25_subscr.extended = nb->extended;
1da177e4 LT	367	x25_subscr.global_facil_mask = nb->global_facil_mask;
5595a1a5	368	read_unlock_bh(&x25_neigh_list_lock);
1da177e4 LT	369	rc = copy_to_user(arg, &x25_subscr,
	370	sizeof(x25_subscr)) ? -EFAULT : 0;
	371	} else {
	372	rc = -EINVAL;
	373	if (!(x25_subscr.extended && x25_subscr.extended != 1)) {
	374	rc = 0;
5595a1a5	375	write_lock_bh(&x25_neigh_list_lock);
1da177e4 LT	376	nb->extended = x25_subscr.extended;
1da177e4 LT	377	nb->global_facil_mask = x25_subscr.global_facil_mask;
5595a1a5	378	write_unlock_bh(&x25_neigh_list_lock);
1da177e4 LT	379	}
	380	}
	381	x25_neigh_put(nb);
	382	out:
	383	return rc;
	384	out_dev_put:
	385	dev_put(dev);
	386	goto out;
	387	}
	388
	389
	390	/*
	391	* Release all memory associated with X.25 neighbour structures.
	392	*/
	393	void __exit x25_link_free(void)
	394	{
	395	struct x25_neigh *nb;
	396	struct list_head entry, tmp;
	397
	398	write_lock_bh(&x25_neigh_list_lock);
	399
	400	list_for_each_safe(entry, tmp, &x25_neigh_list) {
96642d42 DM	401	struct net_device *dev;
96642d42 DM	402
1da177e4	403	nb = list_entry(entry, struct x25_neigh, node);
96642d42	404	dev = nb->dev;
1da177e4	405	__x25_remove_neigh(nb);
96642d42	406	dev_put(dev);
1da177e4 LT	407	}
	408	write_unlock_bh(&x25_neigh_list_lock);
	409	}