[deliverable/linux.git] / net / lapb / lapb_timer.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.
 */

#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/skbuff.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/lapb.h>

static void lapb_t1timer_expiry(unsigned long);
static void lapb_t2timer_expiry(unsigned long);

void lapb_start_t1timer(struct lapb_cb *lapb)
{
	del_timer(&lapb->t1timer);

	lapb->t1timer.data     = (unsigned long)lapb;
	lapb->t1timer.function = &lapb_t1timer_expiry;
	lapb->t1timer.expires  = jiffies + lapb->t1;

	add_timer(&lapb->t1timer);
}

void lapb_start_t2timer(struct lapb_cb *lapb)
{
	del_timer(&lapb->t2timer);

	lapb->t2timer.data     = (unsigned long)lapb;
	lapb->t2timer.function = &lapb_t2timer_expiry;
	lapb->t2timer.expires  = jiffies + lapb->t2;

	add_timer(&lapb->t2timer);
}

void lapb_stop_t1timer(struct lapb_cb *lapb)
{
	del_timer(&lapb->t1timer);
}

void lapb_stop_t2timer(struct lapb_cb *lapb)
{
	del_timer(&lapb->t2timer);
}

int lapb_t1timer_running(struct lapb_cb *lapb)
{
	return timer_pending(&lapb->t1timer);
}

static void lapb_t2timer_expiry(unsigned long param)
{
	struct lapb_cb *lapb = (struct lapb_cb *)param;

	if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
		lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
		lapb_timeout_response(lapb);
	}
}

static void lapb_t1timer_expiry(unsigned long param)
{
	struct lapb_cb *lapb = (struct lapb_cb *)param;

	switch (lapb->state) {

		/*
		 *	If we are a DCE, keep going DM .. DM .. DM
		 */
		case LAPB_STATE_0:
			if (lapb->mode & LAPB_DCE)
				lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE);
			break;

		/*
		 *	Awaiting connection state, send SABM(E), up to N2 times.
		 */
		case LAPB_STATE_1:
			if (lapb->n2count == lapb->n2) {
				lapb_clear_queues(lapb);
				lapb->state = LAPB_STATE_0;
				lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
#if LAPB_DEBUG > 0
				printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->dev);
#endif
				return;
			} else {
				lapb->n2count++;
				if (lapb->mode & LAPB_EXTENDED) {
#if LAPB_DEBUG > 1
					printk(KERN_DEBUG "lapb: (%p) S1 TX SABME(1)\n", lapb->dev);
#endif
					lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
				} else {
#if LAPB_DEBUG > 1
					printk(KERN_DEBUG "lapb: (%p) S1 TX SABM(1)\n", lapb->dev);
#endif
					lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
				}
			}
			break;

		/*
		 *	Awaiting disconnection state, send DISC, up to N2 times.
		 */
		case LAPB_STATE_2:
			if (lapb->n2count == lapb->n2) {
				lapb_clear_queues(lapb);
				lapb->state = LAPB_STATE_0;
				lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT);
#if LAPB_DEBUG > 0
				printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->dev);
#endif
				return;
			} else {
				lapb->n2count++;
#if LAPB_DEBUG > 1
				printk(KERN_DEBUG "lapb: (%p) S2 TX DISC(1)\n", lapb->dev);
#endif
				lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
			}
			break;

		/*
		 *	Data transfer state, restransmit I frames, up to N2 times.
		 */
		case LAPB_STATE_3:
			if (lapb->n2count == lapb->n2) {
				lapb_clear_queues(lapb);
				lapb->state = LAPB_STATE_0;
				lapb_stop_t2timer(lapb);
				lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
#if LAPB_DEBUG > 0
				printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->dev);
#endif
				return;
			} else {
				lapb->n2count++;
				lapb_requeue_frames(lapb);
			}
			break;

		/*
		 *	Frame reject state, restransmit FRMR frames, up to N2 times.
		 */
		case LAPB_STATE_4:
			if (lapb->n2count == lapb->n2) {
				lapb_clear_queues(lapb);
				lapb->state = LAPB_STATE_0;
				lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
#if LAPB_DEBUG > 0
				printk(KERN_DEBUG "lapb: (%p) S4 -> S0\n", lapb->dev);
#endif
				return;
			} else {
				lapb->n2count++;
				lapb_transmit_frmr(lapb);
			}
			break;
	}

	lapb_start_t1timer(lapb);
}
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	*/
	16
	17	#include <linux/errno.h>
	18	#include <linux/types.h>
	19	#include <linux/socket.h>
	20	#include <linux/in.h>
	21	#include <linux/kernel.h>
	22	#include <linux/jiffies.h>
	23	#include <linux/timer.h>
	24	#include <linux/string.h>
	25	#include <linux/sockios.h>
	26	#include <linux/net.h>
	27	#include <linux/inet.h>
	28	#include <linux/skbuff.h>
	29	#include <net/sock.h>
	30	#include <asm/uaccess.h>
1da177e4 LT	31	#include <linux/fcntl.h>
	32	#include <linux/mm.h>
	33	#include <linux/interrupt.h>
	34	#include <net/lapb.h>
	35
	36	static void lapb_t1timer_expiry(unsigned long);
	37	static void lapb_t2timer_expiry(unsigned long);
	38
	39	void lapb_start_t1timer(struct lapb_cb *lapb)
	40	{
	41	del_timer(&lapb->t1timer);
	42
	43	lapb->t1timer.data = (unsigned long)lapb;
	44	lapb->t1timer.function = &lapb_t1timer_expiry;
	45	lapb->t1timer.expires = jiffies + lapb->t1;
	46
	47	add_timer(&lapb->t1timer);
	48	}
	49
	50	void lapb_start_t2timer(struct lapb_cb *lapb)
	51	{
	52	del_timer(&lapb->t2timer);
	53
	54	lapb->t2timer.data = (unsigned long)lapb;
	55	lapb->t2timer.function = &lapb_t2timer_expiry;
	56	lapb->t2timer.expires = jiffies + lapb->t2;
	57
	58	add_timer(&lapb->t2timer);
	59	}
	60
	61	void lapb_stop_t1timer(struct lapb_cb *lapb)
	62	{
	63	del_timer(&lapb->t1timer);
	64	}
	65
	66	void lapb_stop_t2timer(struct lapb_cb *lapb)
	67	{
	68	del_timer(&lapb->t2timer);
	69	}
	70
	71	int lapb_t1timer_running(struct lapb_cb *lapb)
	72	{
	73	return timer_pending(&lapb->t1timer);
	74	}
	75
	76	static void lapb_t2timer_expiry(unsigned long param)
	77	{
	78	struct lapb_cb lapb = (struct lapb_cb )param;
	79
	80	if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
	81	lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
	82	lapb_timeout_response(lapb);
	83	}
	84	}
	85
	86	static void lapb_t1timer_expiry(unsigned long param)
	87	{
	88	struct lapb_cb lapb = (struct lapb_cb )param;
	89
	90	switch (lapb->state) {
	91
	92	/*
	93	* If we are a DCE, keep going DM .. DM .. DM
	94	*/
95	case LAPB_STATE_0:
96	if (lapb->mode & LAPB_DCE)
97	lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE);
98	break;
99
100	/*
101	* Awaiting connection state, send SABM(E), up to N2 times.
102	*/
56d6c3d7	103	case LAPB_STATE_1:
1da177e4 LT	104	if (lapb->n2count == lapb->n2) {
	105	lapb_clear_queues(lapb);
	106	lapb->state = LAPB_STATE_0;
	107	lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
	108	#if LAPB_DEBUG > 0
	109	printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->dev);
	110	#endif
	111	return;
	112	} else {
	113	lapb->n2count++;
	114	if (lapb->mode & LAPB_EXTENDED) {
	115	#if LAPB_DEBUG > 1
	116	printk(KERN_DEBUG "lapb: (%p) S1 TX SABME(1)\n", lapb->dev);
	117	#endif
	118	lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
	119	} else {
	120	#if LAPB_DEBUG > 1
	121	printk(KERN_DEBUG "lapb: (%p) S1 TX SABM(1)\n", lapb->dev);
	122	#endif
	123	lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
	124	}
	125	}
	126	break;
	127
	128	/*
	129	* Awaiting disconnection state, send DISC, up to N2 times.
	130	*/
	131	case LAPB_STATE_2:
	132	if (lapb->n2count == lapb->n2) {
	133	lapb_clear_queues(lapb);
	134	lapb->state = LAPB_STATE_0;
	135	lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT);
	136	#if LAPB_DEBUG > 0
	137	printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->dev);
	138	#endif
	139	return;
	140	} else {
	141	lapb->n2count++;
	142	#if LAPB_DEBUG > 1
	143	printk(KERN_DEBUG "lapb: (%p) S2 TX DISC(1)\n", lapb->dev);
	144	#endif
	145	lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
	146	}
	147	break;
	148
	149	/*
	150	* Data transfer state, restransmit I frames, up to N2 times.
	151	*/
	152	case LAPB_STATE_3:
	153	if (lapb->n2count == lapb->n2) {
	154	lapb_clear_queues(lapb);
	155	lapb->state = LAPB_STATE_0;
	156	lapb_stop_t2timer(lapb);
	157	lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
	158	#if LAPB_DEBUG > 0
	159	printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->dev);
	160	#endif
	161	return;
	162	} else {
	163	lapb->n2count++;
	164	lapb_requeue_frames(lapb);
	165	}
	166	break;
	167
168	/*
169	* Frame reject state, restransmit FRMR frames, up to N2 times.
170	*/
171	case LAPB_STATE_4:
172	if (lapb->n2count == lapb->n2) {
173	lapb_clear_queues(lapb);
174	lapb->state = LAPB_STATE_0;
175	lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
176	#if LAPB_DEBUG > 0
177	printk(KERN_DEBUG "lapb: (%p) S4 -> S0\n", lapb->dev);
178	#endif
179	return;
180	} else {
181	lapb->n2count++;
182	lapb_transmit_frmr(lapb);
183	}
184	break;
185	}
186
187	lapb_start_t1timer(lapb);
188	}