[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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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);
				lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev);
				return;
			} else {
				lapb->n2count++;
				if (lapb->mode & LAPB_EXTENDED) {
					lapb_dbg(1, "(%p) S1 TX SABME(1)\n",
						 lapb->dev);
					lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
				} else {
					lapb_dbg(1, "(%p) S1 TX SABM(1)\n",
						 lapb->dev);
					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);
				lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev);
				return;
			} else {
				lapb->n2count++;
				lapb_dbg(1, "(%p) S2 TX DISC(1)\n", lapb->dev);
				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);
				lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev);
				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);
				lapb_dbg(0, "(%p) S4 -> S0\n", lapb->dev);
				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
a508da6c JP	17	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
a508da6c JP	18
1da177e4 LT	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/skbuff.h>
	31	#include <net/sock.h>
	32	#include <asm/uaccess.h>
1da177e4 LT	33	#include <linux/fcntl.h>
	34	#include <linux/mm.h>
	35	#include <linux/interrupt.h>
	36	#include <net/lapb.h>
	37
	38	static void lapb_t1timer_expiry(unsigned long);
	39	static void lapb_t2timer_expiry(unsigned long);
	40
	41	void lapb_start_t1timer(struct lapb_cb *lapb)
	42	{
	43	del_timer(&lapb->t1timer);
	44
	45	lapb->t1timer.data = (unsigned long)lapb;
	46	lapb->t1timer.function = &lapb_t1timer_expiry;
	47	lapb->t1timer.expires = jiffies + lapb->t1;
	48
	49	add_timer(&lapb->t1timer);
	50	}
	51
	52	void lapb_start_t2timer(struct lapb_cb *lapb)
	53	{
	54	del_timer(&lapb->t2timer);
	55
	56	lapb->t2timer.data = (unsigned long)lapb;
	57	lapb->t2timer.function = &lapb_t2timer_expiry;
	58	lapb->t2timer.expires = jiffies + lapb->t2;
	59
	60	add_timer(&lapb->t2timer);
	61	}
	62
	63	void lapb_stop_t1timer(struct lapb_cb *lapb)
	64	{
	65	del_timer(&lapb->t1timer);
	66	}
	67
	68	void lapb_stop_t2timer(struct lapb_cb *lapb)
	69	{
	70	del_timer(&lapb->t2timer);
	71	}
	72
	73	int lapb_t1timer_running(struct lapb_cb *lapb)
	74	{
	75	return timer_pending(&lapb->t1timer);
	76	}
	77
	78	static void lapb_t2timer_expiry(unsigned long param)
	79	{
	80	struct lapb_cb lapb = (struct lapb_cb )param;
	81
	82	if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
	83	lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
	84	lapb_timeout_response(lapb);
	85	}
	86	}
	87
	88	static void lapb_t1timer_expiry(unsigned long param)
	89	{
	90	struct lapb_cb lapb = (struct lapb_cb )param;
	91
	92	switch (lapb->state) {
	93
	94	/*
	95	* If we are a DCE, keep going DM .. DM .. DM
	96	*/
97	case LAPB_STATE_0:
98	if (lapb->mode & LAPB_DCE)
99	lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE);
100	break;
101
102	/*
103	* Awaiting connection state, send SABM(E), up to N2 times.
104	*/
56d6c3d7	105	case LAPB_STATE_1:
1da177e4 LT	106	if (lapb->n2count == lapb->n2) {
	107	lapb_clear_queues(lapb);
	108	lapb->state = LAPB_STATE_0;
	109	lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
a508da6c	110	lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev);
1da177e4 LT	111	return;
	112	} else {
	113	lapb->n2count++;
	114	if (lapb->mode & LAPB_EXTENDED) {
a508da6c JP	115	lapb_dbg(1, "(%p) S1 TX SABME(1)\n",
a508da6c JP	116	lapb->dev);
1da177e4 LT	117	lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
1da177e4 LT	118	} else {
a508da6c JP	119	lapb_dbg(1, "(%p) S1 TX SABM(1)\n",
a508da6c JP	120	lapb->dev);
1da177e4 LT	121	lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
	122	}
	123	}
	124	break;
	125
	126	/*
	127	* Awaiting disconnection state, send DISC, up to N2 times.
	128	*/
	129	case LAPB_STATE_2:
	130	if (lapb->n2count == lapb->n2) {
	131	lapb_clear_queues(lapb);
	132	lapb->state = LAPB_STATE_0;
	133	lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT);
a508da6c	134	lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev);
1da177e4 LT	135	return;
	136	} else {
	137	lapb->n2count++;
a508da6c	138	lapb_dbg(1, "(%p) S2 TX DISC(1)\n", lapb->dev);
1da177e4 LT	139	lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
	140	}
	141	break;
	142
	143	/*
	144	* Data transfer state, restransmit I frames, up to N2 times.
	145	*/
	146	case LAPB_STATE_3:
	147	if (lapb->n2count == lapb->n2) {
	148	lapb_clear_queues(lapb);
	149	lapb->state = LAPB_STATE_0;
	150	lapb_stop_t2timer(lapb);
	151	lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
a508da6c	152	lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev);
1da177e4 LT	153	return;
	154	} else {
	155	lapb->n2count++;
	156	lapb_requeue_frames(lapb);
	157	}
	158	break;
	159
	160	/*
	161	* Frame reject state, restransmit FRMR frames, up to N2 times.
	162	*/
	163	case LAPB_STATE_4:
	164	if (lapb->n2count == lapb->n2) {
	165	lapb_clear_queues(lapb);
	166	lapb->state = LAPB_STATE_0;
	167	lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
a508da6c	168	lapb_dbg(0, "(%p) S4 -> S0\n", lapb->dev);
1da177e4 LT	169	return;
	170	} else {
	171	lapb->n2count++;
	172	lapb_transmit_frmr(lapb);
	173	}
	174	break;
	175	}
	176
	177	lapb_start_t1timer(lapb);
	178	}