[net-next-2.6.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 <asm/system.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>
	31	#include <asm/system.h>
	32	#include <linux/fcntl.h>
	33	#include <linux/mm.h>
	34	#include <linux/interrupt.h>
	35	#include <net/lapb.h>
	36
	37	static void lapb_t1timer_expiry(unsigned long);
	38	static void lapb_t2timer_expiry(unsigned long);
	39
	40	void lapb_start_t1timer(struct lapb_cb *lapb)
	41	{
	42	del_timer(&lapb->t1timer);
	43
	44	lapb->t1timer.data = (unsigned long)lapb;
	45	lapb->t1timer.function = &lapb_t1timer_expiry;
	46	lapb->t1timer.expires = jiffies + lapb->t1;
	47
	48	add_timer(&lapb->t1timer);
	49	}
	50
	51	void lapb_start_t2timer(struct lapb_cb *lapb)
	52	{
	53	del_timer(&lapb->t2timer);
	54
	55	lapb->t2timer.data = (unsigned long)lapb;
	56	lapb->t2timer.function = &lapb_t2timer_expiry;
	57	lapb->t2timer.expires = jiffies + lapb->t2;
	58
	59	add_timer(&lapb->t2timer);
	60	}
	61
	62	void lapb_stop_t1timer(struct lapb_cb *lapb)
	63	{
	64	del_timer(&lapb->t1timer);
65	}
66
67	void lapb_stop_t2timer(struct lapb_cb *lapb)
68	{
69	del_timer(&lapb->t2timer);
70	}
71
72	int lapb_t1timer_running(struct lapb_cb *lapb)
73	{
74	return timer_pending(&lapb->t1timer);
75	}
76
77	static void lapb_t2timer_expiry(unsigned long param)
78	{
79	struct lapb_cb lapb = (struct lapb_cb )param;
80
81	if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
82	lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
83	lapb_timeout_response(lapb);
84	}
85	}
86
87	static void lapb_t1timer_expiry(unsigned long param)
88	{
89	struct lapb_cb lapb = (struct lapb_cb )param;
90
91	switch (lapb->state) {
92
93	/*
94	* If we are a DCE, keep going DM .. DM .. DM
95	*/
96	case LAPB_STATE_0:
97	if (lapb->mode & LAPB_DCE)
98	lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE);
99	break;
100
101	/*
102	* Awaiting connection state, send SABM(E), up to N2 times.
103	*/
56d6c3d7	104	case LAPB_STATE_1:
1da177e4 LT	105	if (lapb->n2count == lapb->n2) {
	106	lapb_clear_queues(lapb);
	107	lapb->state = LAPB_STATE_0;
	108	lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
	109	#if LAPB_DEBUG > 0
	110	printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->dev);
	111	#endif
	112	return;
	113	} else {
	114	lapb->n2count++;
	115	if (lapb->mode & LAPB_EXTENDED) {
	116	#if LAPB_DEBUG > 1
	117	printk(KERN_DEBUG "lapb: (%p) S1 TX SABME(1)\n", lapb->dev);
	118	#endif
	119	lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
	120	} else {
	121	#if LAPB_DEBUG > 1
	122	printk(KERN_DEBUG "lapb: (%p) S1 TX SABM(1)\n", lapb->dev);
	123	#endif
	124	lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
	125	}
	126	}
	127	break;
	128
	129	/*
	130	* Awaiting disconnection state, send DISC, up to N2 times.
	131	*/
	132	case LAPB_STATE_2:
	133	if (lapb->n2count == lapb->n2) {
	134	lapb_clear_queues(lapb);
	135	lapb->state = LAPB_STATE_0;
	136	lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT);
	137	#if LAPB_DEBUG > 0
	138	printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->dev);
	139	#endif
	140	return;
	141	} else {
	142	lapb->n2count++;
	143	#if LAPB_DEBUG > 1
	144	printk(KERN_DEBUG "lapb: (%p) S2 TX DISC(1)\n", lapb->dev);
	145	#endif
	146	lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
	147	}
	148	break;
	149
	150	/*
	151	* Data transfer state, restransmit I frames, up to N2 times.
	152	*/
	153	case LAPB_STATE_3:
	154	if (lapb->n2count == lapb->n2) {
	155	lapb_clear_queues(lapb);
	156	lapb->state = LAPB_STATE_0;
	157	lapb_stop_t2timer(lapb);
	158	lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
	159	#if LAPB_DEBUG > 0
	160	printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->dev);
	161	#endif
	162	return;
	163	} else {
	164	lapb->n2count++;
	165	lapb_requeue_frames(lapb);
	166	}
	167	break;
	168
169	/*
170	* Frame reject state, restransmit FRMR frames, up to N2 times.
171	*/
172	case LAPB_STATE_4:
173	if (lapb->n2count == lapb->n2) {
174	lapb_clear_queues(lapb);
175	lapb->state = LAPB_STATE_0;
176	lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
177	#if LAPB_DEBUG > 0
178	printk(KERN_DEBUG "lapb: (%p) S4 -> S0\n", lapb->dev);
179	#endif
180	return;
181	} else {
182	lapb->n2count++;
183	lapb_transmit_frmr(lapb);
184	}
185	break;
186	}
187
188	lapb_start_t1timer(lapb);
189	}