[linux-block.git] / net / netrom / nr_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 <linux/uaccess.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/netrom.h>

static void nr_heartbeat_expiry(struct timer_list *);
static void nr_t1timer_expiry(struct timer_list *);
static void nr_t2timer_expiry(struct timer_list *);
static void nr_t4timer_expiry(struct timer_list *);
static void nr_idletimer_expiry(struct timer_list *);

void nr_init_timers(struct sock *sk)
{
	struct nr_sock *nr = nr_sk(sk);

	timer_setup(&nr->t1timer, nr_t1timer_expiry, 0);
	timer_setup(&nr->t2timer, nr_t2timer_expiry, 0);
	timer_setup(&nr->t4timer, nr_t4timer_expiry, 0);
	timer_setup(&nr->idletimer, nr_idletimer_expiry, 0);

	/* initialized by sock_init_data */
	sk->sk_timer.function = nr_heartbeat_expiry;
}

void nr_start_t1timer(struct sock *sk)
{
	struct nr_sock *nr = nr_sk(sk);

	mod_timer(&nr->t1timer, jiffies + nr->t1);
}

void nr_start_t2timer(struct sock *sk)
{
	struct nr_sock *nr = nr_sk(sk);

	mod_timer(&nr->t2timer, jiffies + nr->t2);
}

void nr_start_t4timer(struct sock *sk)
{
	struct nr_sock *nr = nr_sk(sk);

	mod_timer(&nr->t4timer, jiffies + nr->t4);
}

void nr_start_idletimer(struct sock *sk)
{
	struct nr_sock *nr = nr_sk(sk);

	if (nr->idle > 0)
		mod_timer(&nr->idletimer, jiffies + nr->idle);
}

void nr_start_heartbeat(struct sock *sk)
{
	mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
}

void nr_stop_t1timer(struct sock *sk)
{
	del_timer(&nr_sk(sk)->t1timer);
}

void nr_stop_t2timer(struct sock *sk)
{
	del_timer(&nr_sk(sk)->t2timer);
}

void nr_stop_t4timer(struct sock *sk)
{
	del_timer(&nr_sk(sk)->t4timer);
}

void nr_stop_idletimer(struct sock *sk)
{
	del_timer(&nr_sk(sk)->idletimer);
}

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

int nr_t1timer_running(struct sock *sk)
{
	return timer_pending(&nr_sk(sk)->t1timer);
}

static void nr_heartbeat_expiry(struct timer_list *t)
{
	struct sock *sk = from_timer(sk, t, sk_timer);
	struct nr_sock *nr = nr_sk(sk);

	bh_lock_sock(sk);
	switch (nr->state) {
	case NR_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))) {
			sock_hold(sk);
			bh_unlock_sock(sk);
			nr_destroy_socket(sk);
			sock_put(sk);
			return;
		}
		break;

	case NR_STATE_3:
		/*
		 * Check for the state of the receive buffer.
		 */
		if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
		    (nr->condition & NR_COND_OWN_RX_BUSY)) {
			nr->condition &= ~NR_COND_OWN_RX_BUSY;
			nr->condition &= ~NR_COND_ACK_PENDING;
			nr->vl         = nr->vr;
			nr_write_internal(sk, NR_INFOACK);
			break;
		}
		break;
	}

	nr_start_heartbeat(sk);
	bh_unlock_sock(sk);
}

static void nr_t2timer_expiry(struct timer_list *t)
{
	struct nr_sock *nr = from_timer(nr, t, t2timer);
	struct sock *sk = &nr->sock;

	bh_lock_sock(sk);
	if (nr->condition & NR_COND_ACK_PENDING) {
		nr->condition &= ~NR_COND_ACK_PENDING;
		nr_enquiry_response(sk);
	}
	bh_unlock_sock(sk);
}

static void nr_t4timer_expiry(struct timer_list *t)
{
	struct nr_sock *nr = from_timer(nr, t, t4timer);
	struct sock *sk = &nr->sock;

	bh_lock_sock(sk);
	nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
	bh_unlock_sock(sk);
}

static void nr_idletimer_expiry(struct timer_list *t)
{
	struct nr_sock *nr = from_timer(nr, t, idletimer);
	struct sock *sk = &nr->sock;

	bh_lock_sock(sk);

	nr_clear_queues(sk);

	nr->n2count = 0;
	nr_write_internal(sk, NR_DISCREQ);
	nr->state = NR_STATE_2;

	nr_start_t1timer(sk);
	nr_stop_t2timer(sk);
	nr_stop_t4timer(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);
}

static void nr_t1timer_expiry(struct timer_list *t)
{
	struct nr_sock *nr = from_timer(nr, t, t1timer);
	struct sock *sk = &nr->sock;

	bh_lock_sock(sk);
	switch (nr->state) {
	case NR_STATE_1:
		if (nr->n2count == nr->n2) {
			nr_disconnect(sk, ETIMEDOUT);
			bh_unlock_sock(sk);
			return;
		} else {
			nr->n2count++;
			nr_write_internal(sk, NR_CONNREQ);
		}
		break;

	case NR_STATE_2:
		if (nr->n2count == nr->n2) {
			nr_disconnect(sk, ETIMEDOUT);
			bh_unlock_sock(sk);
			return;
		} else {
			nr->n2count++;
			nr_write_internal(sk, NR_DISCREQ);
		}
		break;

	case NR_STATE_3:
		if (nr->n2count == nr->n2) {
			nr_disconnect(sk, ETIMEDOUT);
			bh_unlock_sock(sk);
			return;
		} else {
			nr->n2count++;
			nr_requeue_frames(sk);
		}
		break;
	}

	nr_start_t1timer(sk);
	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>
dc8e5416	26	#include <linux/uaccess.h>
1da177e4 LT	27	#include <linux/fcntl.h>
	28	#include <linux/mm.h>
	29	#include <linux/interrupt.h>
	30	#include <net/netrom.h>
	31
99767f27 KC	32	static void nr_heartbeat_expiry(struct timer_list *);
	33	static void nr_t1timer_expiry(struct timer_list *);
	34	static void nr_t2timer_expiry(struct timer_list *);
	35	static void nr_t4timer_expiry(struct timer_list *);
	36	static void nr_idletimer_expiry(struct timer_list *);
1da177e4 LT	37
	38	void nr_init_timers(struct sock *sk)
	39	{
	40	struct nr_sock *nr = nr_sk(sk);
	41
99767f27 KC	42	timer_setup(&nr->t1timer, nr_t1timer_expiry, 0);
	43	timer_setup(&nr->t2timer, nr_t2timer_expiry, 0);
	44	timer_setup(&nr->t4timer, nr_t4timer_expiry, 0);
	45	timer_setup(&nr->idletimer, nr_idletimer_expiry, 0);
1da177e4 LT	46
1da177e4 LT	47	/* initialized by sock_init_data */
841b86f3	48	sk->sk_timer.function = nr_heartbeat_expiry;
1da177e4 LT	49	}
	50
	51	void nr_start_t1timer(struct sock *sk)
	52	{
	53	struct nr_sock *nr = nr_sk(sk);
	54
	55	mod_timer(&nr->t1timer, jiffies + nr->t1);
	56	}
	57
	58	void nr_start_t2timer(struct sock *sk)
	59	{
	60	struct nr_sock *nr = nr_sk(sk);
	61
	62	mod_timer(&nr->t2timer, jiffies + nr->t2);
	63	}
	64
	65	void nr_start_t4timer(struct sock *sk)
	66	{
	67	struct nr_sock *nr = nr_sk(sk);
	68
	69	mod_timer(&nr->t4timer, jiffies + nr->t4);
	70	}
	71
	72	void nr_start_idletimer(struct sock *sk)
	73	{
	74	struct nr_sock *nr = nr_sk(sk);
	75
	76	if (nr->idle > 0)
	77	mod_timer(&nr->idletimer, jiffies + nr->idle);
	78	}
	79
	80	void nr_start_heartbeat(struct sock *sk)
	81	{
	82	mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
	83	}
	84
	85	void nr_stop_t1timer(struct sock *sk)
	86	{
	87	del_timer(&nr_sk(sk)->t1timer);
	88	}
	89
	90	void nr_stop_t2timer(struct sock *sk)
	91	{
	92	del_timer(&nr_sk(sk)->t2timer);
	93	}
	94
	95	void nr_stop_t4timer(struct sock *sk)
	96	{
	97	del_timer(&nr_sk(sk)->t4timer);
	98	}
	99
	100	void nr_stop_idletimer(struct sock *sk)
	101	{
	102	del_timer(&nr_sk(sk)->idletimer);
	103	}
	104
	105	void nr_stop_heartbeat(struct sock *sk)
	106	{
	107	del_timer(&sk->sk_timer);
	108	}
	109
	110	int nr_t1timer_running(struct sock *sk)
	111	{
	112	return timer_pending(&nr_sk(sk)->t1timer);
113	}
114
99767f27	115	static void nr_heartbeat_expiry(struct timer_list *t)
1da177e4	116	{
99767f27	117	struct sock *sk = from_timer(sk, t, sk_timer);
1da177e4 LT	118	struct nr_sock *nr = nr_sk(sk);
	119
	120	bh_lock_sock(sk);
	121	switch (nr->state) {
	122	case NR_STATE_0:
	123	/* Magic here: If we listen() and a new link dies before it
	124	is accepted() it isn't 'dead' so doesn't get removed. */
	125	if (sock_flag(sk, SOCK_DESTROY) \|\|
	126	(sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
	127	sock_hold(sk);
1da177e4	128	bh_unlock_sock(sk);
8bf2b7b1	129	nr_destroy_socket(sk);
1da177e4 LT	130	sock_put(sk);
	131	return;
	132	}
	133	break;
	134
	135	case NR_STATE_3:
	136	/*
	137	* Check for the state of the receive buffer.
	138	*/
	139	if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
	140	(nr->condition & NR_COND_OWN_RX_BUSY)) {
	141	nr->condition &= ~NR_COND_OWN_RX_BUSY;
	142	nr->condition &= ~NR_COND_ACK_PENDING;
	143	nr->vl = nr->vr;
	144	nr_write_internal(sk, NR_INFOACK);
	145	break;
	146	}
	147	break;
	148	}
	149
	150	nr_start_heartbeat(sk);
	151	bh_unlock_sock(sk);
	152	}
	153
99767f27	154	static void nr_t2timer_expiry(struct timer_list *t)
1da177e4	155	{
99767f27 KC	156	struct nr_sock *nr = from_timer(nr, t, t2timer);
99767f27 KC	157	struct sock *sk = &nr->sock;
1da177e4 LT	158
	159	bh_lock_sock(sk);
	160	if (nr->condition & NR_COND_ACK_PENDING) {
	161	nr->condition &= ~NR_COND_ACK_PENDING;
	162	nr_enquiry_response(sk);
	163	}
	164	bh_unlock_sock(sk);
	165	}
	166
99767f27	167	static void nr_t4timer_expiry(struct timer_list *t)
1da177e4	168	{
99767f27 KC	169	struct nr_sock *nr = from_timer(nr, t, t4timer);
99767f27 KC	170	struct sock *sk = &nr->sock;
1da177e4 LT	171
	172	bh_lock_sock(sk);
	173	nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
	174	bh_unlock_sock(sk);
	175	}
	176
99767f27	177	static void nr_idletimer_expiry(struct timer_list *t)
1da177e4	178	{
99767f27 KC	179	struct nr_sock *nr = from_timer(nr, t, idletimer);
99767f27 KC	180	struct sock *sk = &nr->sock;
1da177e4 LT	181
	182	bh_lock_sock(sk);
	183
	184	nr_clear_queues(sk);
	185
	186	nr->n2count = 0;
	187	nr_write_internal(sk, NR_DISCREQ);
	188	nr->state = NR_STATE_2;
	189
	190	nr_start_t1timer(sk);
	191	nr_stop_t2timer(sk);
	192	nr_stop_t4timer(sk);
	193
	194	sk->sk_state = TCP_CLOSE;
	195	sk->sk_err = 0;
	196	sk->sk_shutdown \|= SEND_SHUTDOWN;
	197
	198	if (!sock_flag(sk, SOCK_DEAD)) {
	199	sk->sk_state_change(sk);
	200	sock_set_flag(sk, SOCK_DEAD);
	201	}
	202	bh_unlock_sock(sk);
	203	}
	204
99767f27	205	static void nr_t1timer_expiry(struct timer_list *t)
1da177e4	206	{
99767f27 KC	207	struct nr_sock *nr = from_timer(nr, t, t1timer);
99767f27 KC	208	struct sock *sk = &nr->sock;
1da177e4 LT	209
	210	bh_lock_sock(sk);
	211	switch (nr->state) {
	212	case NR_STATE_1:
	213	if (nr->n2count == nr->n2) {
	214	nr_disconnect(sk, ETIMEDOUT);
	215	bh_unlock_sock(sk);
	216	return;
	217	} else {
	218	nr->n2count++;
	219	nr_write_internal(sk, NR_CONNREQ);
	220	}
	221	break;
	222
	223	case NR_STATE_2:
	224	if (nr->n2count == nr->n2) {
	225	nr_disconnect(sk, ETIMEDOUT);
	226	bh_unlock_sock(sk);
	227	return;
	228	} else {
	229	nr->n2count++;
	230	nr_write_internal(sk, NR_DISCREQ);
	231	}
	232	break;
	233
	234	case NR_STATE_3:
	235	if (nr->n2count == nr->n2) {
	236	nr_disconnect(sk, ETIMEDOUT);
	237	bh_unlock_sock(sk);
	238	return;
	239	} else {
	240	nr->n2count++;
	241	nr_requeue_frames(sk);
	242	}
	243	break;
	244	}
	245
	246	nr_start_t1timer(sk);
	247	bh_unlock_sock(sk);
	248	}