[mirror_ubuntu-bionic-kernel.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 <linux/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)
{
	refcount_inc(&lapb->refcnt);
}

static __inline__ void lapb_put(struct lapb_cb *lapb)
{
	if (refcount_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);
	}
}
EXPORT_SYMBOL(lapb_register);

/*
 *	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);

	timer_setup(&lapb->t1timer, NULL, 0);
	timer_setup(&lapb->t2timer, NULL, 0);

	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;
	refcount_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;
}
EXPORT_SYMBOL(lapb_unregister);

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;
}
EXPORT_SYMBOL(lapb_getparms);

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;
}
EXPORT_SYMBOL(lapb_setparms);

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;
}
EXPORT_SYMBOL(lapb_connect_request);

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;
}
EXPORT_SYMBOL(lapb_disconnect_request);

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;
}
EXPORT_SYMBOL(lapb_data_request);

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;
}
EXPORT_SYMBOL(lapb_data_received);

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;
}

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	35	#include <net/sock.h>
7c0f6ba6	36	#include <linux/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	{
0408c58b	57	refcount_inc(&lapb->refcnt);
1da177e4 LT	58	}
	59
	60	static __inline__ void lapb_put(struct lapb_cb *lapb)
	61	{
0408c58b	62	if (refcount_dec_and_test(&lapb->refcnt))
1da177e4 LT	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	}
75da1469	76	EXPORT_SYMBOL(lapb_register);
1da177e4 LT	77
	78	/*
	79	* Add a socket to the bound sockets list.
	80	*/
	81	static void __lapb_insert_cb(struct lapb_cb *lapb)
	82	{
	83	list_add(&lapb->node, &lapb_list);
	84	lapb_hold(lapb);
	85	}
	86
	87	static struct lapb_cb __lapb_devtostruct(struct net_device dev)
	88	{
	89	struct list_head *entry;
	90	struct lapb_cb lapb, use = NULL;
	91
	92	list_for_each(entry, &lapb_list) {
	93	lapb = list_entry(entry, struct lapb_cb, node);
	94	if (lapb->dev == dev) {
	95	use = lapb;
	96	break;
	97	}
	98	}
	99
	100	if (use)
	101	lapb_hold(use);
	102
	103	return use;
	104	}
	105
	106	static struct lapb_cb lapb_devtostruct(struct net_device dev)
	107	{
	108	struct lapb_cb *rc;
	109
	110	read_lock_bh(&lapb_list_lock);
	111	rc = __lapb_devtostruct(dev);
	112	read_unlock_bh(&lapb_list_lock);
	113
	114	return rc;
	115	}
	116	/*
	117	* Create an empty LAPB control block.
	118	*/
	119	static struct lapb_cb *lapb_create_cb(void)
	120	{
0da974f4	121	struct lapb_cb lapb = kzalloc(sizeof(lapb), GFP_ATOMIC);
1da177e4 LT	122
	123
	124	if (!lapb)
	125	goto out;
	126
1da177e4 LT	127	skb_queue_head_init(&lapb->write_queue);
	128	skb_queue_head_init(&lapb->ack_queue);
	129
83a37b32 KC	130	timer_setup(&lapb->t1timer, NULL, 0);
83a37b32 KC	131	timer_setup(&lapb->t2timer, NULL, 0);
1da177e4 LT	132
	133	lapb->t1 = LAPB_DEFAULT_T1;
	134	lapb->t2 = LAPB_DEFAULT_T2;
	135	lapb->n2 = LAPB_DEFAULT_N2;
	136	lapb->mode = LAPB_DEFAULT_MODE;
	137	lapb->window = LAPB_DEFAULT_WINDOW;
	138	lapb->state = LAPB_STATE_0;
0408c58b	139	refcount_set(&lapb->refcnt, 1);
1da177e4 LT	140	out:
	141	return lapb;
	142	}
	143
d97a077a	144	int lapb_register(struct net_device *dev,
d97a077a	145	const struct lapb_register_struct *callbacks)
1da177e4 LT	146	{
	147	struct lapb_cb *lapb;
	148	int rc = LAPB_BADTOKEN;
	149
	150	write_lock_bh(&lapb_list_lock);
	151
	152	lapb = __lapb_devtostruct(dev);
	153	if (lapb) {
	154	lapb_put(lapb);
	155	goto out;
	156	}
	157
	158	lapb = lapb_create_cb();
	159	rc = LAPB_NOMEM;
	160	if (!lapb)
	161	goto out;
	162
	163	lapb->dev = dev;
d97a077a	164	lapb->callbacks = callbacks;
1da177e4 LT	165
	166	__lapb_insert_cb(lapb);
	167
	168	lapb_start_t1timer(lapb);
	169
	170	rc = LAPB_OK;
	171	out:
	172	write_unlock_bh(&lapb_list_lock);
	173	return rc;
	174	}
	175
	176	int lapb_unregister(struct net_device *dev)
	177	{
	178	struct lapb_cb *lapb;
	179	int rc = LAPB_BADTOKEN;
	180
	181	write_lock_bh(&lapb_list_lock);
	182	lapb = __lapb_devtostruct(dev);
	183	if (!lapb)
	184	goto out;
	185
	186	lapb_stop_t1timer(lapb);
	187	lapb_stop_t2timer(lapb);
	188
	189	lapb_clear_queues(lapb);
	190
	191	__lapb_remove_cb(lapb);
	192
	193	lapb_put(lapb);
	194	rc = LAPB_OK;
	195	out:
	196	write_unlock_bh(&lapb_list_lock);
	197	return rc;
	198	}
75da1469	199	EXPORT_SYMBOL(lapb_unregister);
1da177e4 LT	200
	201	int lapb_getparms(struct net_device dev, struct lapb_parms_struct parms)
	202	{
	203	int rc = LAPB_BADTOKEN;
	204	struct lapb_cb *lapb = lapb_devtostruct(dev);
	205
	206	if (!lapb)
	207	goto out;
	208
	209	parms->t1 = lapb->t1 / HZ;
	210	parms->t2 = lapb->t2 / HZ;
	211	parms->n2 = lapb->n2;
	212	parms->n2count = lapb->n2count;
	213	parms->state = lapb->state;
	214	parms->window = lapb->window;
	215	parms->mode = lapb->mode;
	216
	217	if (!timer_pending(&lapb->t1timer))
	218	parms->t1timer = 0;
	219	else
	220	parms->t1timer = (lapb->t1timer.expires - jiffies) / HZ;
	221
	222	if (!timer_pending(&lapb->t2timer))
	223	parms->t2timer = 0;
	224	else
	225	parms->t2timer = (lapb->t2timer.expires - jiffies) / HZ;
	226
	227	lapb_put(lapb);
	228	rc = LAPB_OK;
	229	out:
	230	return rc;
	231	}
75da1469	232	EXPORT_SYMBOL(lapb_getparms);
1da177e4 LT	233
	234	int lapb_setparms(struct net_device dev, struct lapb_parms_struct parms)
	235	{
	236	int rc = LAPB_BADTOKEN;
	237	struct lapb_cb *lapb = lapb_devtostruct(dev);
	238
	239	if (!lapb)
	240	goto out;
	241
	242	rc = LAPB_INVALUE;
	243	if (parms->t1 < 1 \|\| parms->t2 < 1 \|\| parms->n2 < 1)
	244	goto out_put;
	245
	246	if (lapb->state == LAPB_STATE_0) {
558e10a5 DC	247	if (parms->mode & LAPB_EXTENDED) {
	248	if (parms->window < 1 \|\| parms->window > 127)
	249	goto out_put;
	250	} else {
	251	if (parms->window < 1 \|\| parms->window > 7)
	252	goto out_put;
	253	}
1da177e4 LT	254	lapb->mode = parms->mode;
	255	lapb->window = parms->window;
	256	}
	257
	258	lapb->t1 = parms->t1 * HZ;
	259	lapb->t2 = parms->t2 * HZ;
	260	lapb->n2 = parms->n2;
	261
	262	rc = LAPB_OK;
	263	out_put:
	264	lapb_put(lapb);
	265	out:
	266	return rc;
	267	}
75da1469	268	EXPORT_SYMBOL(lapb_setparms);
1da177e4 LT	269
	270	int lapb_connect_request(struct net_device *dev)
	271	{
	272	struct lapb_cb *lapb = lapb_devtostruct(dev);
	273	int rc = LAPB_BADTOKEN;
	274
	275	if (!lapb)
	276	goto out;
	277
	278	rc = LAPB_OK;
	279	if (lapb->state == LAPB_STATE_1)
	280	goto out_put;
	281
	282	rc = LAPB_CONNECTED;
	283	if (lapb->state == LAPB_STATE_3 \|\| lapb->state == LAPB_STATE_4)
	284	goto out_put;
	285
	286	lapb_establish_data_link(lapb);
	287
a508da6c	288	lapb_dbg(0, "(%p) S0 -> S1\n", lapb->dev);
1da177e4 LT	289	lapb->state = LAPB_STATE_1;
	290
	291	rc = LAPB_OK;
	292	out_put:
	293	lapb_put(lapb);
	294	out:
	295	return rc;
	296	}
75da1469	297	EXPORT_SYMBOL(lapb_connect_request);
1da177e4 LT	298
	299	int lapb_disconnect_request(struct net_device *dev)
	300	{
	301	struct lapb_cb *lapb = lapb_devtostruct(dev);
	302	int rc = LAPB_BADTOKEN;
	303
	304	if (!lapb)
	305	goto out;
	306
	307	switch (lapb->state) {
fcb261f3 JP	308	case LAPB_STATE_0:
	309	rc = LAPB_NOTCONNECTED;
	310	goto out_put;
1da177e4	311
fcb261f3	312	case LAPB_STATE_1:
a508da6c JP	313	lapb_dbg(1, "(%p) S1 TX DISC(1)\n", lapb->dev);
a508da6c JP	314	lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev);
fcb261f3 JP	315	lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
	316	lapb->state = LAPB_STATE_0;
	317	lapb_start_t1timer(lapb);
	318	rc = LAPB_NOTCONNECTED;
	319	goto out_put;
	320
	321	case LAPB_STATE_2:
	322	rc = LAPB_OK;
	323	goto out_put;
1da177e4 LT	324	}
	325
	326	lapb_clear_queues(lapb);
	327	lapb->n2count = 0;
	328	lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
	329	lapb_start_t1timer(lapb);
	330	lapb_stop_t2timer(lapb);
	331	lapb->state = LAPB_STATE_2;
	332
a508da6c JP	333	lapb_dbg(1, "(%p) S3 DISC(1)\n", lapb->dev);
a508da6c JP	334	lapb_dbg(0, "(%p) S3 -> S2\n", lapb->dev);
1da177e4 LT	335
	336	rc = LAPB_OK;
	337	out_put:
	338	lapb_put(lapb);
	339	out:
	340	return rc;
	341	}
75da1469	342	EXPORT_SYMBOL(lapb_disconnect_request);
1da177e4 LT	343
	344	int lapb_data_request(struct net_device dev, struct sk_buff skb)
	345	{
	346	struct lapb_cb *lapb = lapb_devtostruct(dev);
	347	int rc = LAPB_BADTOKEN;
	348
	349	if (!lapb)
	350	goto out;
	351
	352	rc = LAPB_NOTCONNECTED;
	353	if (lapb->state != LAPB_STATE_3 && lapb->state != LAPB_STATE_4)
	354	goto out_put;
	355
	356	skb_queue_tail(&lapb->write_queue, skb);
	357	lapb_kick(lapb);
	358	rc = LAPB_OK;
	359	out_put:
	360	lapb_put(lapb);
	361	out:
	362	return rc;
	363	}
75da1469	364	EXPORT_SYMBOL(lapb_data_request);
1da177e4 LT	365
	366	int lapb_data_received(struct net_device dev, struct sk_buff skb)
	367	{
	368	struct lapb_cb *lapb = lapb_devtostruct(dev);
	369	int rc = LAPB_BADTOKEN;
	370
	371	if (lapb) {
	372	lapb_data_input(lapb, skb);
	373	lapb_put(lapb);
	374	rc = LAPB_OK;
	375	}
	376
	377	return rc;
	378	}
75da1469	379	EXPORT_SYMBOL(lapb_data_received);
1da177e4 LT	380
	381	void lapb_connect_confirmation(struct lapb_cb *lapb, int reason)
	382	{
d97a077a	383	if (lapb->callbacks->connect_confirmation)
d97a077a	384	lapb->callbacks->connect_confirmation(lapb->dev, reason);
1da177e4 LT	385	}
	386
	387	void lapb_connect_indication(struct lapb_cb *lapb, int reason)
	388	{
d97a077a	389	if (lapb->callbacks->connect_indication)
d97a077a	390	lapb->callbacks->connect_indication(lapb->dev, reason);
1da177e4 LT	391	}
	392
	393	void lapb_disconnect_confirmation(struct lapb_cb *lapb, int reason)
	394	{
d97a077a	395	if (lapb->callbacks->disconnect_confirmation)
d97a077a	396	lapb->callbacks->disconnect_confirmation(lapb->dev, reason);
1da177e4 LT	397	}
	398
	399	void lapb_disconnect_indication(struct lapb_cb *lapb, int reason)
	400	{
d97a077a	401	if (lapb->callbacks->disconnect_indication)
d97a077a	402	lapb->callbacks->disconnect_indication(lapb->dev, reason);
1da177e4 LT	403	}
	404
	405	int lapb_data_indication(struct lapb_cb lapb, struct sk_buff skb)
	406	{
d97a077a	407	if (lapb->callbacks->data_indication)
d97a077a	408	return lapb->callbacks->data_indication(lapb->dev, skb);
1da177e4 LT	409
1da177e4 LT	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
d97a077a	418	if (lapb->callbacks->data_transmit) {
d97a077a	419	lapb->callbacks->data_transmit(lapb->dev, skb);
1da177e4 LT	420	used = 1;
	421	}
	422
	423	return used;
	424	}
	425
1da177e4 LT	426	static int __init lapb_init(void)
	427	{
	428	return 0;
	429	}
	430
	431	static void __exit lapb_exit(void)
	432	{
	433	WARN_ON(!list_empty(&lapb_list));
	434	}
	435
	436	MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
	437	MODULE_DESCRIPTION("The X.25 Link Access Procedure B link layer protocol");
	438	MODULE_LICENSE("GPL");
	439
	440	module_init(lapb_init);
	441	module_exit(lapb_exit);