[GitHub/mt8127/android_kernel_alcatel_ttab.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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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 <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,
		  const 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);

	lapb_dbg(0, "(%p) S0 -> S1\n", lapb->dev);
	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:
		lapb_dbg(1, "(%p) S1 TX DISC(1)\n", lapb->dev);
		lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev);
		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;

	lapb_dbg(1, "(%p) S3 DISC(1)\n", lapb->dev);
	lapb_dbg(0, "(%p) S3 -> S2\n", lapb->dev);

	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
a508da6c JP	18	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
a508da6c JP	19
1da177e4 LT	20	#include <linux/module.h>
	21	#include <linux/errno.h>
	22	#include <linux/types.h>
	23	#include <linux/socket.h>
	24	#include <linux/in.h>
	25	#include <linux/kernel.h>
	26	#include <linux/jiffies.h>
	27	#include <linux/timer.h>
	28	#include <linux/string.h>
	29	#include <linux/sockios.h>
	30	#include <linux/net.h>
	31	#include <linux/inet.h>
	32	#include <linux/if_arp.h>
	33	#include <linux/skbuff.h>
5a0e3ad6	34	#include <linux/slab.h>
1da177e4 LT	35	#include <net/sock.h>
1da177e4 LT	36	#include <asm/uaccess.h>
1da177e4 LT	37	#include <linux/fcntl.h>
	38	#include <linux/mm.h>
	39	#include <linux/interrupt.h>
	40	#include <linux/stat.h>
	41	#include <linux/init.h>
	42	#include <net/lapb.h>
	43
14d0e7b7	44	static LIST_HEAD(lapb_list);
1da177e4 LT	45	static DEFINE_RWLOCK(lapb_list_lock);
	46
	47	/*
56d6c3d7	48	* Free an allocated lapb control block.
1da177e4 LT	49	*/
	50	static void lapb_free_cb(struct lapb_cb *lapb)
	51	{
	52	kfree(lapb);
	53	}
	54
	55	static __inline__ void lapb_hold(struct lapb_cb *lapb)
	56	{
	57	atomic_inc(&lapb->refcnt);
	58	}
	59
	60	static __inline__ void lapb_put(struct lapb_cb *lapb)
	61	{
	62	if (atomic_dec_and_test(&lapb->refcnt))
	63	lapb_free_cb(lapb);
	64	}
	65
	66	/*
	67	* Socket removal during an interrupt is now safe.
	68	*/
	69	static void __lapb_remove_cb(struct lapb_cb *lapb)
	70	{
	71	if (lapb->node.next) {
	72	list_del(&lapb->node);
	73	lapb_put(lapb);
	74	}
	75	}
	76
	77	/*
	78	* Add a socket to the bound sockets list.
	79	*/
	80	static void __lapb_insert_cb(struct lapb_cb *lapb)
	81	{
	82	list_add(&lapb->node, &lapb_list);
	83	lapb_hold(lapb);
	84	}
	85
	86	static struct lapb_cb __lapb_devtostruct(struct net_device dev)
	87	{
	88	struct list_head *entry;
	89	struct lapb_cb lapb, use = NULL;
	90
	91	list_for_each(entry, &lapb_list) {
	92	lapb = list_entry(entry, struct lapb_cb, node);
	93	if (lapb->dev == dev) {
	94	use = lapb;
	95	break;
	96	}
	97	}
	98
	99	if (use)
	100	lapb_hold(use);
	101
	102	return use;
	103	}
	104
	105	static struct lapb_cb lapb_devtostruct(struct net_device dev)
	106	{
	107	struct lapb_cb *rc;
	108
	109	read_lock_bh(&lapb_list_lock);
	110	rc = __lapb_devtostruct(dev);
	111	read_unlock_bh(&lapb_list_lock);
	112
113	return rc;
114	}
115	/*
116	* Create an empty LAPB control block.
117	*/
118	static struct lapb_cb *lapb_create_cb(void)
119	{
0da974f4	120	struct lapb_cb lapb = kzalloc(sizeof(lapb), GFP_ATOMIC);
1da177e4 LT	121
	122
	123	if (!lapb)
	124	goto out;
	125
1da177e4 LT	126	skb_queue_head_init(&lapb->write_queue);
	127	skb_queue_head_init(&lapb->ack_queue);
	128
	129	init_timer(&lapb->t1timer);
	130	init_timer(&lapb->t2timer);
	131
	132	lapb->t1 = LAPB_DEFAULT_T1;
	133	lapb->t2 = LAPB_DEFAULT_T2;
	134	lapb->n2 = LAPB_DEFAULT_N2;
	135	lapb->mode = LAPB_DEFAULT_MODE;
	136	lapb->window = LAPB_DEFAULT_WINDOW;
	137	lapb->state = LAPB_STATE_0;
	138	atomic_set(&lapb->refcnt, 1);
	139	out:
	140	return lapb;
	141	}
	142
d97a077a	143	int lapb_register(struct net_device *dev,
d97a077a	144	const struct lapb_register_struct *callbacks)
1da177e4 LT	145	{
	146	struct lapb_cb *lapb;
	147	int rc = LAPB_BADTOKEN;
	148
	149	write_lock_bh(&lapb_list_lock);
	150
	151	lapb = __lapb_devtostruct(dev);
	152	if (lapb) {
	153	lapb_put(lapb);
	154	goto out;
	155	}
	156
	157	lapb = lapb_create_cb();
	158	rc = LAPB_NOMEM;
	159	if (!lapb)
	160	goto out;
	161
	162	lapb->dev = dev;
d97a077a	163	lapb->callbacks = callbacks;
1da177e4 LT	164
	165	__lapb_insert_cb(lapb);
	166
	167	lapb_start_t1timer(lapb);
	168
	169	rc = LAPB_OK;
	170	out:
	171	write_unlock_bh(&lapb_list_lock);
	172	return rc;
	173	}
	174
	175	int lapb_unregister(struct net_device *dev)
	176	{
	177	struct lapb_cb *lapb;
	178	int rc = LAPB_BADTOKEN;
	179
	180	write_lock_bh(&lapb_list_lock);
	181	lapb = __lapb_devtostruct(dev);
	182	if (!lapb)
	183	goto out;
	184
	185	lapb_stop_t1timer(lapb);
	186	lapb_stop_t2timer(lapb);
	187
	188	lapb_clear_queues(lapb);
	189
	190	__lapb_remove_cb(lapb);
	191
	192	lapb_put(lapb);
	193	rc = LAPB_OK;
	194	out:
	195	write_unlock_bh(&lapb_list_lock);
	196	return rc;
	197	}
	198
	199	int lapb_getparms(struct net_device dev, struct lapb_parms_struct parms)
	200	{
	201	int rc = LAPB_BADTOKEN;
	202	struct lapb_cb *lapb = lapb_devtostruct(dev);
	203
	204	if (!lapb)
	205	goto out;
	206
	207	parms->t1 = lapb->t1 / HZ;
	208	parms->t2 = lapb->t2 / HZ;
	209	parms->n2 = lapb->n2;
	210	parms->n2count = lapb->n2count;
	211	parms->state = lapb->state;
	212	parms->window = lapb->window;
	213	parms->mode = lapb->mode;
	214
	215	if (!timer_pending(&lapb->t1timer))
	216	parms->t1timer = 0;
	217	else
	218	parms->t1timer = (lapb->t1timer.expires - jiffies) / HZ;
	219
	220	if (!timer_pending(&lapb->t2timer))
	221	parms->t2timer = 0;
	222	else
	223	parms->t2timer = (lapb->t2timer.expires - jiffies) / HZ;
	224
	225	lapb_put(lapb);
	226	rc = LAPB_OK;
	227	out:
228	return rc;
229	}
230
231	int lapb_setparms(struct net_device dev, struct lapb_parms_struct parms)
232	{
233	int rc = LAPB_BADTOKEN;
234	struct lapb_cb *lapb = lapb_devtostruct(dev);
235
236	if (!lapb)
237	goto out;
238
239	rc = LAPB_INVALUE;
240	if (parms->t1 < 1 \|\| parms->t2 < 1 \|\| parms->n2 < 1)
241	goto out_put;
242
243	if (lapb->state == LAPB_STATE_0) {
558e10a5 DC	244	if (parms->mode & LAPB_EXTENDED) {
	245	if (parms->window < 1 \|\| parms->window > 127)
	246	goto out_put;
	247	} else {
	248	if (parms->window < 1 \|\| parms->window > 7)
	249	goto out_put;
	250	}
1da177e4 LT	251	lapb->mode = parms->mode;
	252	lapb->window = parms->window;
	253	}
	254
	255	lapb->t1 = parms->t1 * HZ;
	256	lapb->t2 = parms->t2 * HZ;
	257	lapb->n2 = parms->n2;
	258
	259	rc = LAPB_OK;
	260	out_put:
	261	lapb_put(lapb);
	262	out:
	263	return rc;
	264	}
	265
	266	int lapb_connect_request(struct net_device *dev)
	267	{
	268	struct lapb_cb *lapb = lapb_devtostruct(dev);
	269	int rc = LAPB_BADTOKEN;
	270
	271	if (!lapb)
	272	goto out;
	273
	274	rc = LAPB_OK;
	275	if (lapb->state == LAPB_STATE_1)
	276	goto out_put;
	277
	278	rc = LAPB_CONNECTED;
	279	if (lapb->state == LAPB_STATE_3 \|\| lapb->state == LAPB_STATE_4)
	280	goto out_put;
	281
	282	lapb_establish_data_link(lapb);
	283
a508da6c	284	lapb_dbg(0, "(%p) S0 -> S1\n", lapb->dev);
1da177e4 LT	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) {
fcb261f3 JP	303	case LAPB_STATE_0:
	304	rc = LAPB_NOTCONNECTED;
	305	goto out_put;
1da177e4	306
fcb261f3	307	case LAPB_STATE_1:
a508da6c JP	308	lapb_dbg(1, "(%p) S1 TX DISC(1)\n", lapb->dev);
a508da6c JP	309	lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev);
fcb261f3 JP	310	lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
	311	lapb->state = LAPB_STATE_0;
	312	lapb_start_t1timer(lapb);
	313	rc = LAPB_NOTCONNECTED;
	314	goto out_put;
	315
	316	case LAPB_STATE_2:
	317	rc = LAPB_OK;
	318	goto out_put;
1da177e4 LT	319	}
	320
	321	lapb_clear_queues(lapb);
	322	lapb->n2count = 0;
	323	lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
	324	lapb_start_t1timer(lapb);
	325	lapb_stop_t2timer(lapb);
	326	lapb->state = LAPB_STATE_2;
	327
a508da6c JP	328	lapb_dbg(1, "(%p) S3 DISC(1)\n", lapb->dev);
a508da6c JP	329	lapb_dbg(0, "(%p) S3 -> S2\n", lapb->dev);
1da177e4 LT	330
	331	rc = LAPB_OK;
	332	out_put:
	333	lapb_put(lapb);
	334	out:
	335	return rc;
	336	}
	337
	338	int lapb_data_request(struct net_device dev, struct sk_buff skb)
	339	{
	340	struct lapb_cb *lapb = lapb_devtostruct(dev);
	341	int rc = LAPB_BADTOKEN;
	342
	343	if (!lapb)
	344	goto out;
	345
	346	rc = LAPB_NOTCONNECTED;
	347	if (lapb->state != LAPB_STATE_3 && lapb->state != LAPB_STATE_4)
	348	goto out_put;
	349
	350	skb_queue_tail(&lapb->write_queue, skb);
	351	lapb_kick(lapb);
	352	rc = LAPB_OK;
	353	out_put:
	354	lapb_put(lapb);
	355	out:
	356	return rc;
	357	}
	358
	359	int lapb_data_received(struct net_device dev, struct sk_buff skb)
	360	{
	361	struct lapb_cb *lapb = lapb_devtostruct(dev);
	362	int rc = LAPB_BADTOKEN;
	363
	364	if (lapb) {
	365	lapb_data_input(lapb, skb);
	366	lapb_put(lapb);
	367	rc = LAPB_OK;
	368	}
	369
	370	return rc;
	371	}
	372
	373	void lapb_connect_confirmation(struct lapb_cb *lapb, int reason)
	374	{
d97a077a	375	if (lapb->callbacks->connect_confirmation)
d97a077a	376	lapb->callbacks->connect_confirmation(lapb->dev, reason);
1da177e4 LT	377	}
	378
	379	void lapb_connect_indication(struct lapb_cb *lapb, int reason)
	380	{
d97a077a	381	if (lapb->callbacks->connect_indication)
d97a077a	382	lapb->callbacks->connect_indication(lapb->dev, reason);
1da177e4 LT	383	}
	384
	385	void lapb_disconnect_confirmation(struct lapb_cb *lapb, int reason)
	386	{
d97a077a	387	if (lapb->callbacks->disconnect_confirmation)
d97a077a	388	lapb->callbacks->disconnect_confirmation(lapb->dev, reason);
1da177e4 LT	389	}
	390
	391	void lapb_disconnect_indication(struct lapb_cb *lapb, int reason)
	392	{
d97a077a	393	if (lapb->callbacks->disconnect_indication)
d97a077a	394	lapb->callbacks->disconnect_indication(lapb->dev, reason);
1da177e4 LT	395	}
	396
	397	int lapb_data_indication(struct lapb_cb lapb, struct sk_buff skb)
	398	{
d97a077a	399	if (lapb->callbacks->data_indication)
d97a077a	400	return lapb->callbacks->data_indication(lapb->dev, skb);
1da177e4 LT	401
1da177e4 LT	402	kfree_skb(skb);
0e8635a8	403	return NET_RX_SUCCESS; /* For now; must be != NET_RX_DROP */
1da177e4 LT	404	}
	405
	406	int lapb_data_transmit(struct lapb_cb lapb, struct sk_buff skb)
	407	{
	408	int used = 0;
	409
d97a077a	410	if (lapb->callbacks->data_transmit) {
d97a077a	411	lapb->callbacks->data_transmit(lapb->dev, skb);
1da177e4 LT	412	used = 1;
	413	}
	414
	415	return used;
	416	}
	417
	418	EXPORT_SYMBOL(lapb_register);
	419	EXPORT_SYMBOL(lapb_unregister);
	420	EXPORT_SYMBOL(lapb_getparms);
	421	EXPORT_SYMBOL(lapb_setparms);
	422	EXPORT_SYMBOL(lapb_connect_request);
	423	EXPORT_SYMBOL(lapb_disconnect_request);
	424	EXPORT_SYMBOL(lapb_data_request);
	425	EXPORT_SYMBOL(lapb_data_received);
	426
	427	static int __init lapb_init(void)
	428	{
	429	return 0;
	430	}
	431
	432	static void __exit lapb_exit(void)
	433	{
	434	WARN_ON(!list_empty(&lapb_list));
	435	}
	436
	437	MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
	438	MODULE_DESCRIPTION("The X.25 Link Access Procedure B link layer protocol");
	439	MODULE_LICENSE("GPL");
	440
	441	module_init(lapb_init);
	442	module_exit(lapb_exit);