[linux-2.6-block.git] / net / rose / rose_timer.c

/*
 * This program 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.
 *
 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
 * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
 */
#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 <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/rose.h>

static void rose_heartbeat_expiry(unsigned long);
static void rose_timer_expiry(unsigned long);
static void rose_idletimer_expiry(unsigned long);

void rose_start_heartbeat(struct sock *sk)
{
	del_timer(&sk->sk_timer);

	sk->sk_timer.data     = (unsigned long)sk;
	sk->sk_timer.function = &rose_heartbeat_expiry;
	sk->sk_timer.expires  = jiffies + 5 * HZ;

	add_timer(&sk->sk_timer);
}

void rose_start_t1timer(struct sock *sk)
{
	struct rose_sock *rose = rose_sk(sk);

	del_timer(&rose->timer);

	rose->timer.data     = (unsigned long)sk;
	rose->timer.function = &rose_timer_expiry;
	rose->timer.expires  = jiffies + rose->t1;

	add_timer(&rose->timer);
}

void rose_start_t2timer(struct sock *sk)
{
	struct rose_sock *rose = rose_sk(sk);

	del_timer(&rose->timer);

	rose->timer.data     = (unsigned long)sk;
	rose->timer.function = &rose_timer_expiry;
	rose->timer.expires  = jiffies + rose->t2;

	add_timer(&rose->timer);
}

void rose_start_t3timer(struct sock *sk)
{
	struct rose_sock *rose = rose_sk(sk);

	del_timer(&rose->timer);

	rose->timer.data     = (unsigned long)sk;
	rose->timer.function = &rose_timer_expiry;
	rose->timer.expires  = jiffies + rose->t3;

	add_timer(&rose->timer);
}

void rose_start_hbtimer(struct sock *sk)
{
	struct rose_sock *rose = rose_sk(sk);

	del_timer(&rose->timer);

	rose->timer.data     = (unsigned long)sk;
	rose->timer.function = &rose_timer_expiry;
	rose->timer.expires  = jiffies + rose->hb;

	add_timer(&rose->timer);
}

void rose_start_idletimer(struct sock *sk)
{
	struct rose_sock *rose = rose_sk(sk);

	del_timer(&rose->idletimer);

	if (rose->idle > 0) {
		rose->idletimer.data     = (unsigned long)sk;
		rose->idletimer.function = &rose_idletimer_expiry;
		rose->idletimer.expires  = jiffies + rose->idle;

		add_timer(&rose->idletimer);
	}
}

void rose_stop_heartbeat(struct sock *sk)
{
	del_timer(&sk->sk_timer);
}

void rose_stop_timer(struct sock *sk)
{
	del_timer(&rose_sk(sk)->timer);
}

void rose_stop_idletimer(struct sock *sk)
{
	del_timer(&rose_sk(sk)->idletimer);
}

static void rose_heartbeat_expiry(unsigned long param)
{
	struct sock *sk = (struct sock *)param;
	struct rose_sock *rose = rose_sk(sk);

	bh_lock_sock(sk);
	switch (rose->state) {
	case ROSE_STATE_0:
		/* Magic here: If we listen() and a new link dies before it
		   is accepted() it isn't 'dead' so doesn't get removed. */
		if (sock_flag(sk, SOCK_DESTROY) ||
		    (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
			bh_unlock_sock(sk);
			rose_destroy_socket(sk);
			return;
		}
		break;

	case ROSE_STATE_3:
		/*
		 * Check for the state of the receive buffer.
		 */
		if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
		    (rose->condition & ROSE_COND_OWN_RX_BUSY)) {
			rose->condition &= ~ROSE_COND_OWN_RX_BUSY;
			rose->condition &= ~ROSE_COND_ACK_PENDING;
			rose->vl         = rose->vr;
			rose_write_internal(sk, ROSE_RR);
			rose_stop_timer(sk);	/* HB */
			break;
		}
		break;
	}

	rose_start_heartbeat(sk);
	bh_unlock_sock(sk);
}

static void rose_timer_expiry(unsigned long param)
{
	struct sock *sk = (struct sock *)param;
	struct rose_sock *rose = rose_sk(sk);

	bh_lock_sock(sk);
	switch (rose->state) {
	case ROSE_STATE_1:	/* T1 */
	case ROSE_STATE_4:	/* T2 */
		rose_write_internal(sk, ROSE_CLEAR_REQUEST);
		rose->state = ROSE_STATE_2;
		rose_start_t3timer(sk);
		break;

	case ROSE_STATE_2:	/* T3 */
		rose->neighbour->use--;
		rose_disconnect(sk, ETIMEDOUT, -1, -1);
		break;

	case ROSE_STATE_3:	/* HB */
		if (rose->condition & ROSE_COND_ACK_PENDING) {
			rose->condition &= ~ROSE_COND_ACK_PENDING;
			rose_enquiry_response(sk);
		}
		break;
	}
	bh_unlock_sock(sk);
}

static void rose_idletimer_expiry(unsigned long param)
{
	struct sock *sk = (struct sock *)param;

	bh_lock_sock(sk);
	rose_clear_queues(sk);

	rose_write_internal(sk, ROSE_CLEAR_REQUEST);
	rose_sk(sk)->state = ROSE_STATE_2;

	rose_start_t3timer(sk);

	sk->sk_state     = TCP_CLOSE;
	sk->sk_err       = 0;
	sk->sk_shutdown |= SEND_SHUTDOWN;

	if (!sock_flag(sk, SOCK_DEAD)) {
		sk->sk_state_change(sk);
		sock_set_flag(sk, SOCK_DEAD);
	}
	bh_unlock_sock(sk);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License as published by
	4	* the Free Software Foundation; either version 2 of the License, or
	5	* (at your option) any later version.
	6	*
	7	* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
	8	* Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
	9	*/
	10	#include <linux/errno.h>
	11	#include <linux/types.h>
	12	#include <linux/socket.h>
	13	#include <linux/in.h>
	14	#include <linux/kernel.h>
	15	#include <linux/jiffies.h>
	16	#include <linux/timer.h>
	17	#include <linux/string.h>
	18	#include <linux/sockios.h>
	19	#include <linux/net.h>
	20	#include <net/ax25.h>
	21	#include <linux/inet.h>
	22	#include <linux/netdevice.h>
	23	#include <linux/skbuff.h>
	24	#include <net/sock.h>
c752f073	25	#include <net/tcp_states.h>
1da177e4 LT	26	#include <asm/system.h>
	27	#include <linux/fcntl.h>
	28	#include <linux/mm.h>
	29	#include <linux/interrupt.h>
	30	#include <net/rose.h>
	31
	32	static void rose_heartbeat_expiry(unsigned long);
	33	static void rose_timer_expiry(unsigned long);
	34	static void rose_idletimer_expiry(unsigned long);
	35
	36	void rose_start_heartbeat(struct sock *sk)
	37	{
	38	del_timer(&sk->sk_timer);
	39
	40	sk->sk_timer.data = (unsigned long)sk;
	41	sk->sk_timer.function = &rose_heartbeat_expiry;
	42	sk->sk_timer.expires = jiffies + 5 * HZ;
	43
	44	add_timer(&sk->sk_timer);
	45	}
	46
	47	void rose_start_t1timer(struct sock *sk)
	48	{
	49	struct rose_sock *rose = rose_sk(sk);
	50
	51	del_timer(&rose->timer);
	52
	53	rose->timer.data = (unsigned long)sk;
	54	rose->timer.function = &rose_timer_expiry;
	55	rose->timer.expires = jiffies + rose->t1;
	56
	57	add_timer(&rose->timer);
	58	}
	59
	60	void rose_start_t2timer(struct sock *sk)
	61	{
	62	struct rose_sock *rose = rose_sk(sk);
	63
	64	del_timer(&rose->timer);
	65
	66	rose->timer.data = (unsigned long)sk;
	67	rose->timer.function = &rose_timer_expiry;
	68	rose->timer.expires = jiffies + rose->t2;
	69
	70	add_timer(&rose->timer);
	71	}
	72
	73	void rose_start_t3timer(struct sock *sk)
	74	{
	75	struct rose_sock *rose = rose_sk(sk);
	76
	77	del_timer(&rose->timer);
	78
	79	rose->timer.data = (unsigned long)sk;
	80	rose->timer.function = &rose_timer_expiry;
	81	rose->timer.expires = jiffies + rose->t3;
	82
	83	add_timer(&rose->timer);
	84	}
	85
	86	void rose_start_hbtimer(struct sock *sk)
	87	{
	88	struct rose_sock *rose = rose_sk(sk);
	89
90	del_timer(&rose->timer);
91
92	rose->timer.data = (unsigned long)sk;
93	rose->timer.function = &rose_timer_expiry;
94	rose->timer.expires = jiffies + rose->hb;
95
96	add_timer(&rose->timer);
97	}
98
99	void rose_start_idletimer(struct sock *sk)
100	{
101	struct rose_sock *rose = rose_sk(sk);
102
103	del_timer(&rose->idletimer);
104
105	if (rose->idle > 0) {
106	rose->idletimer.data = (unsigned long)sk;
107	rose->idletimer.function = &rose_idletimer_expiry;
108	rose->idletimer.expires = jiffies + rose->idle;
109
110	add_timer(&rose->idletimer);
111	}
112	}
113
114	void rose_stop_heartbeat(struct sock *sk)
115	{
116	del_timer(&sk->sk_timer);
117	}
118
119	void rose_stop_timer(struct sock *sk)
120	{
121	del_timer(&rose_sk(sk)->timer);
122	}
123
124	void rose_stop_idletimer(struct sock *sk)
125	{
126	del_timer(&rose_sk(sk)->idletimer);
127	}
128
129	static void rose_heartbeat_expiry(unsigned long param)
130	{
131	struct sock sk = (struct sock )param;
132	struct rose_sock *rose = rose_sk(sk);
133
134	bh_lock_sock(sk);
135	switch (rose->state) {
136	case ROSE_STATE_0:
137	/* Magic here: If we listen() and a new link dies before it
138	is accepted() it isn't 'dead' so doesn't get removed. */
139	if (sock_flag(sk, SOCK_DESTROY) \|\|
140	(sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
a3d7a9d7	141	bh_unlock_sock(sk);
1da177e4 LT	142	rose_destroy_socket(sk);
	143	return;
	144	}
	145	break;
	146
	147	case ROSE_STATE_3:
	148	/*
	149	* Check for the state of the receive buffer.
	150	*/
	151	if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
	152	(rose->condition & ROSE_COND_OWN_RX_BUSY)) {
	153	rose->condition &= ~ROSE_COND_OWN_RX_BUSY;
	154	rose->condition &= ~ROSE_COND_ACK_PENDING;
	155	rose->vl = rose->vr;
	156	rose_write_internal(sk, ROSE_RR);
	157	rose_stop_timer(sk); /* HB */
	158	break;
	159	}
	160	break;
	161	}
	162
	163	rose_start_heartbeat(sk);
	164	bh_unlock_sock(sk);
	165	}
	166
	167	static void rose_timer_expiry(unsigned long param)
	168	{
	169	struct sock sk = (struct sock )param;
	170	struct rose_sock *rose = rose_sk(sk);
	171
	172	bh_lock_sock(sk);
	173	switch (rose->state) {
	174	case ROSE_STATE_1: /* T1 */
	175	case ROSE_STATE_4: /* T2 */
	176	rose_write_internal(sk, ROSE_CLEAR_REQUEST);
	177	rose->state = ROSE_STATE_2;
	178	rose_start_t3timer(sk);
	179	break;
	180
	181	case ROSE_STATE_2: /* T3 */
	182	rose->neighbour->use--;
	183	rose_disconnect(sk, ETIMEDOUT, -1, -1);
	184	break;
	185
	186	case ROSE_STATE_3: /* HB */
	187	if (rose->condition & ROSE_COND_ACK_PENDING) {
	188	rose->condition &= ~ROSE_COND_ACK_PENDING;
	189	rose_enquiry_response(sk);
	190	}
	191	break;
	192	}
	193	bh_unlock_sock(sk);
	194	}
	195
	196	static void rose_idletimer_expiry(unsigned long param)
	197	{
	198	struct sock sk = (struct sock )param;
	199
	200	bh_lock_sock(sk);
	201	rose_clear_queues(sk);
	202
	203	rose_write_internal(sk, ROSE_CLEAR_REQUEST);
	204	rose_sk(sk)->state = ROSE_STATE_2;
	205
206	rose_start_t3timer(sk);
207
208	sk->sk_state = TCP_CLOSE;
209	sk->sk_err = 0;
210	sk->sk_shutdown \|= SEND_SHUTDOWN;
211
212	if (!sock_flag(sk, SOCK_DEAD)) {
213	sk->sk_state_change(sk);
214	sock_set_flag(sk, SOCK_DEAD);
215	}
216	bh_unlock_sock(sk);
217	}