[mirror_ubuntu-bionic-kernel.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 <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/rose.h>

static void rose_heartbeat_expiry(struct timer_list *t);
static void rose_timer_expiry(struct timer_list *);
static void rose_idletimer_expiry(struct timer_list *);

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

	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.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.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.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.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.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(struct timer_list *t)
{
	struct sock *sk = from_timer(sk, t, sk_timer);
	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(struct timer_list *t)
{
	struct rose_sock *rose = from_timer(rose, t, timer);
	struct sock *sk = &rose->sock;

	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(struct timer_list *t)
{
	struct rose_sock *rose = from_timer(rose, t, idletimer);
	struct sock *sk = &rose->sock;

	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 <linux/fcntl.h>
	27	#include <linux/mm.h>
	28	#include <linux/interrupt.h>
	29	#include <net/rose.h>
	30
99767f27	31	static void rose_heartbeat_expiry(struct timer_list *t);
4966babd KC	32	static void rose_timer_expiry(struct timer_list *);
4966babd KC	33	static void rose_idletimer_expiry(struct timer_list *);
1da177e4 LT	34
	35	void rose_start_heartbeat(struct sock *sk)
	36	{
	37	del_timer(&sk->sk_timer);
	38
841b86f3	39	sk->sk_timer.function = rose_heartbeat_expiry;
1da177e4 LT	40	sk->sk_timer.expires = jiffies + 5 * HZ;
	41
	42	add_timer(&sk->sk_timer);
	43	}
	44
	45	void rose_start_t1timer(struct sock *sk)
	46	{
	47	struct rose_sock *rose = rose_sk(sk);
	48
	49	del_timer(&rose->timer);
	50
841b86f3	51	rose->timer.function = rose_timer_expiry;
1da177e4 LT	52	rose->timer.expires = jiffies + rose->t1;
	53
	54	add_timer(&rose->timer);
	55	}
	56
	57	void rose_start_t2timer(struct sock *sk)
	58	{
	59	struct rose_sock *rose = rose_sk(sk);
	60
	61	del_timer(&rose->timer);
	62
841b86f3	63	rose->timer.function = rose_timer_expiry;
1da177e4 LT	64	rose->timer.expires = jiffies + rose->t2;
	65
	66	add_timer(&rose->timer);
	67	}
	68
	69	void rose_start_t3timer(struct sock *sk)
	70	{
	71	struct rose_sock *rose = rose_sk(sk);
	72
	73	del_timer(&rose->timer);
	74
841b86f3	75	rose->timer.function = rose_timer_expiry;
1da177e4 LT	76	rose->timer.expires = jiffies + rose->t3;
	77
	78	add_timer(&rose->timer);
	79	}
	80
	81	void rose_start_hbtimer(struct sock *sk)
	82	{
	83	struct rose_sock *rose = rose_sk(sk);
	84
	85	del_timer(&rose->timer);
	86
841b86f3	87	rose->timer.function = rose_timer_expiry;
1da177e4 LT	88	rose->timer.expires = jiffies + rose->hb;
	89
	90	add_timer(&rose->timer);
	91	}
	92
	93	void rose_start_idletimer(struct sock *sk)
	94	{
	95	struct rose_sock *rose = rose_sk(sk);
	96
	97	del_timer(&rose->idletimer);
	98
	99	if (rose->idle > 0) {
841b86f3	100	rose->idletimer.function = rose_idletimer_expiry;
1da177e4 LT	101	rose->idletimer.expires = jiffies + rose->idle;
	102
	103	add_timer(&rose->idletimer);
	104	}
	105	}
	106
	107	void rose_stop_heartbeat(struct sock *sk)
	108	{
	109	del_timer(&sk->sk_timer);
	110	}
	111
	112	void rose_stop_timer(struct sock *sk)
	113	{
	114	del_timer(&rose_sk(sk)->timer);
	115	}
	116
	117	void rose_stop_idletimer(struct sock *sk)
	118	{
	119	del_timer(&rose_sk(sk)->idletimer);
	120	}
	121
99767f27	122	static void rose_heartbeat_expiry(struct timer_list *t)
1da177e4	123	{
99767f27	124	struct sock *sk = from_timer(sk, t, sk_timer);
1da177e4 LT	125	struct rose_sock *rose = rose_sk(sk);
	126
	127	bh_lock_sock(sk);
	128	switch (rose->state) {
	129	case ROSE_STATE_0:
	130	/* Magic here: If we listen() and a new link dies before it
	131	is accepted() it isn't 'dead' so doesn't get removed. */
	132	if (sock_flag(sk, SOCK_DESTROY) \|\|
	133	(sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
a3d7a9d7	134	bh_unlock_sock(sk);
1da177e4 LT	135	rose_destroy_socket(sk);
	136	return;
	137	}
	138	break;
	139
	140	case ROSE_STATE_3:
	141	/*
	142	* Check for the state of the receive buffer.
	143	*/
	144	if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
	145	(rose->condition & ROSE_COND_OWN_RX_BUSY)) {
	146	rose->condition &= ~ROSE_COND_OWN_RX_BUSY;
	147	rose->condition &= ~ROSE_COND_ACK_PENDING;
	148	rose->vl = rose->vr;
	149	rose_write_internal(sk, ROSE_RR);
	150	rose_stop_timer(sk); /* HB */
	151	break;
	152	}
	153	break;
	154	}
	155
	156	rose_start_heartbeat(sk);
	157	bh_unlock_sock(sk);
	158	}
	159
4966babd	160	static void rose_timer_expiry(struct timer_list *t)
1da177e4	161	{
4966babd KC	162	struct rose_sock *rose = from_timer(rose, t, timer);
4966babd KC	163	struct sock *sk = &rose->sock;
1da177e4 LT	164
	165	bh_lock_sock(sk);
	166	switch (rose->state) {
	167	case ROSE_STATE_1: /* T1 */
	168	case ROSE_STATE_4: /* T2 */
	169	rose_write_internal(sk, ROSE_CLEAR_REQUEST);
	170	rose->state = ROSE_STATE_2;
	171	rose_start_t3timer(sk);
	172	break;
	173
	174	case ROSE_STATE_2: /* T3 */
	175	rose->neighbour->use--;
	176	rose_disconnect(sk, ETIMEDOUT, -1, -1);
	177	break;
	178
	179	case ROSE_STATE_3: /* HB */
	180	if (rose->condition & ROSE_COND_ACK_PENDING) {
	181	rose->condition &= ~ROSE_COND_ACK_PENDING;
	182	rose_enquiry_response(sk);
	183	}
	184	break;
	185	}
	186	bh_unlock_sock(sk);
	187	}
	188
4966babd	189	static void rose_idletimer_expiry(struct timer_list *t)
1da177e4	190	{
4966babd KC	191	struct rose_sock *rose = from_timer(rose, t, idletimer);
4966babd KC	192	struct sock *sk = &rose->sock;
1da177e4 LT	193
	194	bh_lock_sock(sk);
	195	rose_clear_queues(sk);
	196
	197	rose_write_internal(sk, ROSE_CLEAR_REQUEST);
	198	rose_sk(sk)->state = ROSE_STATE_2;
	199
	200	rose_start_t3timer(sk);
	201
	202	sk->sk_state = TCP_CLOSE;
	203	sk->sk_err = 0;
	204	sk->sk_shutdown \|= SEND_SHUTDOWN;
	205
	206	if (!sock_flag(sk, SOCK_DEAD)) {
	207	sk->sk_state_change(sk);
	208	sock_set_flag(sk, SOCK_DEAD);
	209	}
	210	bh_unlock_sock(sk);
	211	}