[net-next-2.6.git] / net / lapb / lapb_iface.c

/*
 *	LAPB release 002
 *
 *	This code REQUIRES 2.1.15 or higher/ NET3.038
 *
 *	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
 *	LAPB 001	Jonathan Naylor	Started Coding
 *	LAPB 002	Jonathan Naylor	New timer architecture.
 *	2000-10-29	Henner Eisen	lapb_data_indication() return status.
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/inet.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <net/lapb.h>

static LIST_HEAD(lapb_list);
static DEFINE_RWLOCK(lapb_list_lock);

/*
 *	Free an allocated lapb control block.
 */
static void lapb_free_cb(struct lapb_cb *lapb)
{
	kfree(lapb);
}

static __inline__ void lapb_hold(struct lapb_cb *lapb)
{
	atomic_inc(&lapb->refcnt);
}

static __inline__ void lapb_put(struct lapb_cb *lapb)
{
	if (atomic_dec_and_test(&lapb->refcnt))
		lapb_free_cb(lapb);
}

/*
 *	Socket removal during an interrupt is now safe.
 */
static void __lapb_remove_cb(struct lapb_cb *lapb)
{
	if (lapb->node.next) {
		list_del(&lapb->node);
		lapb_put(lapb);
	}
}

/*
 *	Add a socket to the bound sockets list.
 */
static void __lapb_insert_cb(struct lapb_cb *lapb)
{
	list_add(&lapb->node, &lapb_list);
	lapb_hold(lapb);
}

static struct lapb_cb *__lapb_devtostruct(struct net_device *dev)
{
	struct list_head *entry;
	struct lapb_cb *lapb, *use = NULL;

	list_for_each(entry, &lapb_list) {
		lapb = list_entry(entry, struct lapb_cb, node);
		if (lapb->dev == dev) {
			use = lapb;
			break;
		}
	}

	if (use)
		lapb_hold(use);

	return use;
}

static struct lapb_cb *lapb_devtostruct(struct net_device *dev)
{
	struct lapb_cb *rc;

	read_lock_bh(&lapb_list_lock);
	rc = __lapb_devtostruct(dev);
	read_unlock_bh(&lapb_list_lock);

	return rc;
}
/*
 *	Create an empty LAPB control block.
 */
static struct lapb_cb *lapb_create_cb(void)
{
	struct lapb_cb *lapb = kzalloc(sizeof(*lapb), GFP_ATOMIC);


	if (!lapb)
		goto out;

	skb_queue_head_init(&lapb->write_queue);
	skb_queue_head_init(&lapb->ack_queue);

	init_timer(&lapb->t1timer);
	init_timer(&lapb->t2timer);

	lapb->t1      = LAPB_DEFAULT_T1;
	lapb->t2      = LAPB_DEFAULT_T2;
	lapb->n2      = LAPB_DEFAULT_N2;
	lapb->mode    = LAPB_DEFAULT_MODE;
	lapb->window  = LAPB_DEFAULT_WINDOW;
	lapb->state   = LAPB_STATE_0;
	atomic_set(&lapb->refcnt, 1);
out:
	return lapb;
}

int lapb_register(struct net_device *dev, struct lapb_register_struct *callbacks)
{
	struct lapb_cb *lapb;
	int rc = LAPB_BADTOKEN;

	write_lock_bh(&lapb_list_lock);

	lapb = __lapb_devtostruct(dev);
	if (lapb) {
		lapb_put(lapb);
		goto out;
	}

	lapb = lapb_create_cb();
	rc = LAPB_NOMEM;
	if (!lapb)
		goto out;

	lapb->dev       = dev;
	lapb->callbacks = *callbacks;

	__lapb_insert_cb(lapb);

	lapb_start_t1timer(lapb);

	rc = LAPB_OK;
out:
	write_unlock_bh(&lapb_list_lock);
	return rc;
}

int lapb_unregister(struct net_device *dev)
{
	struct lapb_cb *lapb;
	int rc = LAPB_BADTOKEN;

	write_lock_bh(&lapb_list_lock);
	lapb = __lapb_devtostruct(dev);
	if (!lapb)
		goto out;

	lapb_stop_t1timer(lapb);
	lapb_stop_t2timer(lapb);

	lapb_clear_queues(lapb);

	__lapb_remove_cb(lapb);

	lapb_put(lapb);
	rc = LAPB_OK;
out:
	write_unlock_bh(&lapb_list_lock);
	return rc;
}

int lapb_getparms(struct net_device *dev, struct lapb_parms_struct *parms)
{
	int rc = LAPB_BADTOKEN;
	struct lapb_cb *lapb = lapb_devtostruct(dev);

	if (!lapb)
		goto out;

	parms->t1      = lapb->t1 / HZ;
	parms->t2      = lapb->t2 / HZ;
	parms->n2      = lapb->n2;
	parms->n2count = lapb->n2count;
	parms->state   = lapb->state;
	parms->window  = lapb->window;
	parms->mode    = lapb->mode;

	if (!timer_pending(&lapb->t1timer))
		parms->t1timer = 0;
	else
		parms->t1timer = (lapb->t1timer.expires - jiffies) / HZ;

	if (!timer_pending(&lapb->t2timer))
		parms->t2timer = 0;
	else
		parms->t2timer = (lapb->t2timer.expires - jiffies) / HZ;

	lapb_put(lapb);
	rc = LAPB_OK;
out:
	return rc;
}

int lapb_setparms(struct net_device *dev, struct lapb_parms_struct *parms)
{
	int rc = LAPB_BADTOKEN;
	struct lapb_cb *lapb = lapb_devtostruct(dev);

	if (!lapb)
		goto out;

	rc = LAPB_INVALUE;
	if (parms->t1 < 1 || parms->t2 < 1 || parms->n2 < 1)
		goto out_put;

	if (lapb->state == LAPB_STATE_0) {
		if (parms->mode & LAPB_EXTENDED) {
			if (parms->window < 1 || parms->window > 127)
				goto out_put;
		} else {
			if (parms->window < 1 || parms->window > 7)
				goto out_put;
		}
		lapb->mode    = parms->mode;
		lapb->window  = parms->window;
	}

	lapb->t1    = parms->t1 * HZ;
	lapb->t2    = parms->t2 * HZ;
	lapb->n2    = parms->n2;

	rc = LAPB_OK;
out_put:
	lapb_put(lapb);
out:
	return rc;
}

int lapb_connect_request(struct net_device *dev)
{
	struct lapb_cb *lapb = lapb_devtostruct(dev);
	int rc = LAPB_BADTOKEN;

	if (!lapb)
		goto out;

	rc = LAPB_OK;
	if (lapb->state == LAPB_STATE_1)
		goto out_put;

	rc = LAPB_CONNECTED;
	if (lapb->state == LAPB_STATE_3 || lapb->state == LAPB_STATE_4)
		goto out_put;

	lapb_establish_data_link(lapb);

#if LAPB_DEBUG > 0
	printk(KERN_DEBUG "lapb: (%p) S0 -> S1\n", lapb->dev);
#endif
	lapb->state = LAPB_STATE_1;

	rc = LAPB_OK;
out_put:
	lapb_put(lapb);
out:
	return rc;
}

int lapb_disconnect_request(struct net_device *dev)
{
	struct lapb_cb *lapb = lapb_devtostruct(dev);
	int rc = LAPB_BADTOKEN;

	if (!lapb)
		goto out;

	switch (lapb->state) {
		case LAPB_STATE_0:
			rc = LAPB_NOTCONNECTED;
			goto out_put;

		case LAPB_STATE_1:
#if LAPB_DEBUG > 1
			printk(KERN_DEBUG "lapb: (%p) S1 TX DISC(1)\n", lapb->dev);
#endif
#if LAPB_DEBUG > 0
			printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->dev);
#endif
			lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
			lapb->state = LAPB_STATE_0;
			lapb_start_t1timer(lapb);
			rc = LAPB_NOTCONNECTED;
			goto out_put;

		case LAPB_STATE_2:
			rc = LAPB_OK;
			goto out_put;
	}

	lapb_clear_queues(lapb);
	lapb->n2count = 0;
	lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
	lapb_start_t1timer(lapb);
	lapb_stop_t2timer(lapb);
	lapb->state = LAPB_STATE_2;

#if LAPB_DEBUG > 1
	printk(KERN_DEBUG "lapb: (%p) S3 DISC(1)\n", lapb->dev);
#endif
#if LAPB_DEBUG > 0
	printk(KERN_DEBUG "lapb: (%p) S3 -> S2\n", lapb->dev);
#endif

	rc = LAPB_OK;
out_put:
	lapb_put(lapb);
out:
	return rc;
}

int lapb_data_request(struct net_device *dev, struct sk_buff *skb)
{
	struct lapb_cb *lapb = lapb_devtostruct(dev);
	int rc = LAPB_BADTOKEN;

	if (!lapb)
		goto out;

	rc = LAPB_NOTCONNECTED;
	if (lapb->state != LAPB_STATE_3 && lapb->state != LAPB_STATE_4)
		goto out_put;

	skb_queue_tail(&lapb->write_queue, skb);
	lapb_kick(lapb);
	rc = LAPB_OK;
out_put:
	lapb_put(lapb);
out:
	return rc;
}

int lapb_data_received(struct net_device *dev, struct sk_buff *skb)
{
	struct lapb_cb *lapb = lapb_devtostruct(dev);
	int rc = LAPB_BADTOKEN;

	if (lapb) {
		lapb_data_input(lapb, skb);
		lapb_put(lapb);
		rc = LAPB_OK;
	}

	return rc;
}

void lapb_connect_confirmation(struct lapb_cb *lapb, int reason)
{
	if (lapb->callbacks.connect_confirmation)
		lapb->callbacks.connect_confirmation(lapb->dev, reason);
}

void lapb_connect_indication(struct lapb_cb *lapb, int reason)
{
	if (lapb->callbacks.connect_indication)
		lapb->callbacks.connect_indication(lapb->dev, reason);
}

void lapb_disconnect_confirmation(struct lapb_cb *lapb, int reason)
{
	if (lapb->callbacks.disconnect_confirmation)
		lapb->callbacks.disconnect_confirmation(lapb->dev, reason);
}

void lapb_disconnect_indication(struct lapb_cb *lapb, int reason)
{
	if (lapb->callbacks.disconnect_indication)
		lapb->callbacks.disconnect_indication(lapb->dev, reason);
}

int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *skb)
{
	if (lapb->callbacks.data_indication)
		return lapb->callbacks.data_indication(lapb->dev, skb);

	kfree_skb(skb);
	return NET_RX_SUCCESS; /* For now; must be != NET_RX_DROP */
}

int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *skb)
{
	int used = 0;

	if (lapb->callbacks.data_transmit) {
		lapb->callbacks.data_transmit(lapb->dev, skb);
		used = 1;
	}

	return used;
}

EXPORT_SYMBOL(lapb_register);
EXPORT_SYMBOL(lapb_unregister);
EXPORT_SYMBOL(lapb_getparms);
EXPORT_SYMBOL(lapb_setparms);
EXPORT_SYMBOL(lapb_connect_request);
EXPORT_SYMBOL(lapb_disconnect_request);
EXPORT_SYMBOL(lapb_data_request);
EXPORT_SYMBOL(lapb_data_received);

static int __init lapb_init(void)
{
	return 0;
}

static void __exit lapb_exit(void)
{
	WARN_ON(!list_empty(&lapb_list));
}

MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
MODULE_DESCRIPTION("The X.25 Link Access Procedure B link layer protocol");
MODULE_LICENSE("GPL");

module_init(lapb_init);
module_exit(lapb_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* LAPB release 002
	3	*
	4	* This code REQUIRES 2.1.15 or higher/ NET3.038
	5	*
	6	* This module:
	7	* This module is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*
	12	* History
	13	* LAPB 001 Jonathan Naylor Started Coding
	14	* LAPB 002 Jonathan Naylor New timer architecture.
	15	* 2000-10-29 Henner Eisen lapb_data_indication() return status.
	16	*/
56d6c3d7	17
1da177e4 LT	18	#include <linux/module.h>
	19	#include <linux/errno.h>
	20	#include <linux/types.h>
	21	#include <linux/socket.h>
	22	#include <linux/in.h>
	23	#include <linux/kernel.h>
	24	#include <linux/jiffies.h>
	25	#include <linux/timer.h>
	26	#include <linux/string.h>
	27	#include <linux/sockios.h>
	28	#include <linux/net.h>
	29	#include <linux/inet.h>
	30	#include <linux/if_arp.h>
	31	#include <linux/skbuff.h>
5a0e3ad6	32	#include <linux/slab.h>
1da177e4 LT	33	#include <net/sock.h>
	34	#include <asm/uaccess.h>
	35	#include <asm/system.h>
	36	#include <linux/fcntl.h>
	37	#include <linux/mm.h>
	38	#include <linux/interrupt.h>
	39	#include <linux/stat.h>
	40	#include <linux/init.h>
	41	#include <net/lapb.h>
	42
14d0e7b7	43	static LIST_HEAD(lapb_list);
1da177e4 LT	44	static DEFINE_RWLOCK(lapb_list_lock);
	45
	46	/*
56d6c3d7	47	* Free an allocated lapb control block.
1da177e4 LT	48	*/
	49	static void lapb_free_cb(struct lapb_cb *lapb)
	50	{
	51	kfree(lapb);
	52	}
	53
	54	static __inline__ void lapb_hold(struct lapb_cb *lapb)
	55	{
	56	atomic_inc(&lapb->refcnt);
	57	}
	58
	59	static __inline__ void lapb_put(struct lapb_cb *lapb)
	60	{
	61	if (atomic_dec_and_test(&lapb->refcnt))
	62	lapb_free_cb(lapb);
	63	}
	64
	65	/*
	66	* Socket removal during an interrupt is now safe.
	67	*/
	68	static void __lapb_remove_cb(struct lapb_cb *lapb)
	69	{
	70	if (lapb->node.next) {
	71	list_del(&lapb->node);
	72	lapb_put(lapb);
	73	}
	74	}
	75
	76	/*
	77	* Add a socket to the bound sockets list.
	78	*/
	79	static void __lapb_insert_cb(struct lapb_cb *lapb)
	80	{
	81	list_add(&lapb->node, &lapb_list);
	82	lapb_hold(lapb);
	83	}
	84
	85	static struct lapb_cb __lapb_devtostruct(struct net_device dev)
	86	{
	87	struct list_head *entry;
	88	struct lapb_cb lapb, use = NULL;
	89
	90	list_for_each(entry, &lapb_list) {
	91	lapb = list_entry(entry, struct lapb_cb, node);
	92	if (lapb->dev == dev) {
	93	use = lapb;
	94	break;
	95	}
	96	}
	97
	98	if (use)
	99	lapb_hold(use);
	100
	101	return use;
	102	}
	103
	104	static struct lapb_cb lapb_devtostruct(struct net_device dev)
	105	{
	106	struct lapb_cb *rc;
	107
	108	read_lock_bh(&lapb_list_lock);
	109	rc = __lapb_devtostruct(dev);
	110	read_unlock_bh(&lapb_list_lock);
	111
112	return rc;
113	}
114	/*
115	* Create an empty LAPB control block.
116	*/
117	static struct lapb_cb *lapb_create_cb(void)
118	{
0da974f4	119	struct lapb_cb lapb = kzalloc(sizeof(lapb), GFP_ATOMIC);
1da177e4 LT	120
	121
	122	if (!lapb)
	123	goto out;
	124
1da177e4 LT	125	skb_queue_head_init(&lapb->write_queue);
	126	skb_queue_head_init(&lapb->ack_queue);
	127
	128	init_timer(&lapb->t1timer);
	129	init_timer(&lapb->t2timer);
	130
	131	lapb->t1 = LAPB_DEFAULT_T1;
	132	lapb->t2 = LAPB_DEFAULT_T2;
	133	lapb->n2 = LAPB_DEFAULT_N2;
	134	lapb->mode = LAPB_DEFAULT_MODE;
	135	lapb->window = LAPB_DEFAULT_WINDOW;
	136	lapb->state = LAPB_STATE_0;
	137	atomic_set(&lapb->refcnt, 1);
	138	out:
	139	return lapb;
	140	}
	141
	142	int lapb_register(struct net_device dev, struct lapb_register_struct callbacks)
	143	{
	144	struct lapb_cb *lapb;
	145	int rc = LAPB_BADTOKEN;
	146
	147	write_lock_bh(&lapb_list_lock);
	148
	149	lapb = __lapb_devtostruct(dev);
	150	if (lapb) {
	151	lapb_put(lapb);
	152	goto out;
	153	}
	154
	155	lapb = lapb_create_cb();
	156	rc = LAPB_NOMEM;
	157	if (!lapb)
	158	goto out;
	159
	160	lapb->dev = dev;
	161	lapb->callbacks = *callbacks;
	162
	163	__lapb_insert_cb(lapb);
	164
	165	lapb_start_t1timer(lapb);
	166
	167	rc = LAPB_OK;
	168	out:
	169	write_unlock_bh(&lapb_list_lock);
	170	return rc;
	171	}
	172
	173	int lapb_unregister(struct net_device *dev)
	174	{
	175	struct lapb_cb *lapb;
	176	int rc = LAPB_BADTOKEN;
	177
	178	write_lock_bh(&lapb_list_lock);
	179	lapb = __lapb_devtostruct(dev);
	180	if (!lapb)
	181	goto out;
	182
	183	lapb_stop_t1timer(lapb);
	184	lapb_stop_t2timer(lapb);
	185
	186	lapb_clear_queues(lapb);
	187
	188	__lapb_remove_cb(lapb);
189
190	lapb_put(lapb);
191	rc = LAPB_OK;
192	out:
193	write_unlock_bh(&lapb_list_lock);
194	return rc;
195	}
196
197	int lapb_getparms(struct net_device dev, struct lapb_parms_struct parms)
198	{
199	int rc = LAPB_BADTOKEN;
200	struct lapb_cb *lapb = lapb_devtostruct(dev);
201
202	if (!lapb)
203	goto out;
204
205	parms->t1 = lapb->t1 / HZ;
206	parms->t2 = lapb->t2 / HZ;
207	parms->n2 = lapb->n2;
208	parms->n2count = lapb->n2count;
209	parms->state = lapb->state;
210	parms->window = lapb->window;
211	parms->mode = lapb->mode;
212
213	if (!timer_pending(&lapb->t1timer))
214	parms->t1timer = 0;
215	else
216	parms->t1timer = (lapb->t1timer.expires - jiffies) / HZ;
217
218	if (!timer_pending(&lapb->t2timer))
219	parms->t2timer = 0;
220	else
221	parms->t2timer = (lapb->t2timer.expires - jiffies) / HZ;
222
223	lapb_put(lapb);
224	rc = LAPB_OK;
225	out:
226	return rc;
227	}
228
229	int lapb_setparms(struct net_device dev, struct lapb_parms_struct parms)
230	{
231	int rc = LAPB_BADTOKEN;
232	struct lapb_cb *lapb = lapb_devtostruct(dev);
233
234	if (!lapb)
235	goto out;
236
237	rc = LAPB_INVALUE;
238	if (parms->t1 < 1 \|\| parms->t2 < 1 \|\| parms->n2 < 1)
239	goto out_put;
240
241	if (lapb->state == LAPB_STATE_0) {
558e10a5 DC	242	if (parms->mode & LAPB_EXTENDED) {
	243	if (parms->window < 1 \|\| parms->window > 127)
	244	goto out_put;
	245	} else {
	246	if (parms->window < 1 \|\| parms->window > 7)
	247	goto out_put;
	248	}
1da177e4 LT	249	lapb->mode = parms->mode;
	250	lapb->window = parms->window;
	251	}
	252
	253	lapb->t1 = parms->t1 * HZ;
	254	lapb->t2 = parms->t2 * HZ;
	255	lapb->n2 = parms->n2;
	256
	257	rc = LAPB_OK;
	258	out_put:
	259	lapb_put(lapb);
	260	out:
	261	return rc;
	262	}
	263
	264	int lapb_connect_request(struct net_device *dev)
	265	{
	266	struct lapb_cb *lapb = lapb_devtostruct(dev);
	267	int rc = LAPB_BADTOKEN;
	268
	269	if (!lapb)
	270	goto out;
	271
	272	rc = LAPB_OK;
	273	if (lapb->state == LAPB_STATE_1)
	274	goto out_put;
	275
	276	rc = LAPB_CONNECTED;
	277	if (lapb->state == LAPB_STATE_3 \|\| lapb->state == LAPB_STATE_4)
	278	goto out_put;
	279
	280	lapb_establish_data_link(lapb);
	281
	282	#if LAPB_DEBUG > 0
	283	printk(KERN_DEBUG "lapb: (%p) S0 -> S1\n", lapb->dev);
	284	#endif
	285	lapb->state = LAPB_STATE_1;
	286
	287	rc = LAPB_OK;
	288	out_put:
	289	lapb_put(lapb);
	290	out:
	291	return rc;
	292	}
	293
	294	int lapb_disconnect_request(struct net_device *dev)
	295	{
	296	struct lapb_cb *lapb = lapb_devtostruct(dev);
	297	int rc = LAPB_BADTOKEN;
	298
	299	if (!lapb)
	300	goto out;
	301
	302	switch (lapb->state) {
	303	case LAPB_STATE_0:
	304	rc = LAPB_NOTCONNECTED;
	305	goto out_put;
	306
	307	case LAPB_STATE_1:
	308	#if LAPB_DEBUG > 1
	309	printk(KERN_DEBUG "lapb: (%p) S1 TX DISC(1)\n", lapb->dev);
	310	#endif
	311	#if LAPB_DEBUG > 0
	312	printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->dev);
313	#endif
314	lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
315	lapb->state = LAPB_STATE_0;
316	lapb_start_t1timer(lapb);
317	rc = LAPB_NOTCONNECTED;
318	goto out_put;
319
320	case LAPB_STATE_2:
321	rc = LAPB_OK;
322	goto out_put;
323	}
324
325	lapb_clear_queues(lapb);
326	lapb->n2count = 0;
327	lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
328	lapb_start_t1timer(lapb);
329	lapb_stop_t2timer(lapb);
330	lapb->state = LAPB_STATE_2;
331
332	#if LAPB_DEBUG > 1
333	printk(KERN_DEBUG "lapb: (%p) S3 DISC(1)\n", lapb->dev);
334	#endif
335	#if LAPB_DEBUG > 0
336	printk(KERN_DEBUG "lapb: (%p) S3 -> S2\n", lapb->dev);
337	#endif
338
339	rc = LAPB_OK;
340	out_put:
341	lapb_put(lapb);
342	out:
343	return rc;
344	}
345
346	int lapb_data_request(struct net_device dev, struct sk_buff skb)
347	{
348	struct lapb_cb *lapb = lapb_devtostruct(dev);
349	int rc = LAPB_BADTOKEN;
350
351	if (!lapb)
352	goto out;
353
354	rc = LAPB_NOTCONNECTED;
355	if (lapb->state != LAPB_STATE_3 && lapb->state != LAPB_STATE_4)
356	goto out_put;
357
358	skb_queue_tail(&lapb->write_queue, skb);
359	lapb_kick(lapb);
360	rc = LAPB_OK;
361	out_put:
362	lapb_put(lapb);
363	out:
364	return rc;
365	}
366
367	int lapb_data_received(struct net_device dev, struct sk_buff skb)
368	{
369	struct lapb_cb *lapb = lapb_devtostruct(dev);
370	int rc = LAPB_BADTOKEN;
371
372	if (lapb) {
373	lapb_data_input(lapb, skb);
374	lapb_put(lapb);
375	rc = LAPB_OK;
376	}
377
378	return rc;
379	}
380
381	void lapb_connect_confirmation(struct lapb_cb *lapb, int reason)
382	{
383	if (lapb->callbacks.connect_confirmation)
384	lapb->callbacks.connect_confirmation(lapb->dev, reason);
385	}
386
387	void lapb_connect_indication(struct lapb_cb *lapb, int reason)
388	{
389	if (lapb->callbacks.connect_indication)
390	lapb->callbacks.connect_indication(lapb->dev, reason);
391	}
392
393	void lapb_disconnect_confirmation(struct lapb_cb *lapb, int reason)
394	{
395	if (lapb->callbacks.disconnect_confirmation)
396	lapb->callbacks.disconnect_confirmation(lapb->dev, reason);
397	}
398
399	void lapb_disconnect_indication(struct lapb_cb *lapb, int reason)
400	{
401	if (lapb->callbacks.disconnect_indication)
402	lapb->callbacks.disconnect_indication(lapb->dev, reason);
403	}
404
405	int lapb_data_indication(struct lapb_cb lapb, struct sk_buff skb)
406	{
407	if (lapb->callbacks.data_indication)
408	return lapb->callbacks.data_indication(lapb->dev, skb);
409
410	kfree_skb(skb);
0e8635a8	411	return NET_RX_SUCCESS; /* For now; must be != NET_RX_DROP */
1da177e4 LT	412	}
	413
	414	int lapb_data_transmit(struct lapb_cb lapb, struct sk_buff skb)
	415	{
	416	int used = 0;
	417
	418	if (lapb->callbacks.data_transmit) {
	419	lapb->callbacks.data_transmit(lapb->dev, skb);
	420	used = 1;
	421	}
	422
	423	return used;
	424	}
	425
	426	EXPORT_SYMBOL(lapb_register);
	427	EXPORT_SYMBOL(lapb_unregister);
	428	EXPORT_SYMBOL(lapb_getparms);
	429	EXPORT_SYMBOL(lapb_setparms);
	430	EXPORT_SYMBOL(lapb_connect_request);
	431	EXPORT_SYMBOL(lapb_disconnect_request);
	432	EXPORT_SYMBOL(lapb_data_request);
	433	EXPORT_SYMBOL(lapb_data_received);
	434
	435	static int __init lapb_init(void)
	436	{
	437	return 0;
	438	}
	439
	440	static void __exit lapb_exit(void)
	441	{
	442	WARN_ON(!list_empty(&lapb_list));
	443	}
	444
	445	MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
	446	MODULE_DESCRIPTION("The X.25 Link Access Procedure B link layer protocol");
	447	MODULE_LICENSE("GPL");
	448
	449	module_init(lapb_init);
	450	module_exit(lapb_exit);