[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / x25 / x25_timer.c

/*
 *	X.25 Packet Layer release 002
 *
 *	This is ALPHA test software. This code may break your machine,
 *	randomly fail to work with new releases, misbehave and/or generally
 *	screw up. It might even work.
 *
 *	This code REQUIRES 2.1.15 or higher
 *
 *	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
 *	X.25 001	Jonathan Naylor	Started coding.
 *	X.25 002	Jonathan Naylor	New timer architecture.
 *					Centralised disconnection processing.
 */

#include <linux/errno.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <net/x25.h>

static void x25_heartbeat_expiry(unsigned long);
static void x25_timer_expiry(unsigned long);

void x25_init_timers(struct sock *sk)
{
	struct x25_sock *x25 = x25_sk(sk);

	setup_timer(&x25->timer, x25_timer_expiry, (unsigned long)sk);

	/* initialized by sock_init_data */
	sk->sk_timer.data     = (unsigned long)sk;
	sk->sk_timer.function = &x25_heartbeat_expiry;
}

void x25_start_heartbeat(struct sock *sk)
{
	mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
}

void x25_stop_heartbeat(struct sock *sk)
{
	del_timer(&sk->sk_timer);
}

void x25_start_t2timer(struct sock *sk)
{
	struct x25_sock *x25 = x25_sk(sk);

	mod_timer(&x25->timer, jiffies + x25->t2);
}

void x25_start_t21timer(struct sock *sk)
{
	struct x25_sock *x25 = x25_sk(sk);

	mod_timer(&x25->timer, jiffies + x25->t21);
}

void x25_start_t22timer(struct sock *sk)
{
	struct x25_sock *x25 = x25_sk(sk);

	mod_timer(&x25->timer, jiffies + x25->t22);
}

void x25_start_t23timer(struct sock *sk)
{
	struct x25_sock *x25 = x25_sk(sk);

	mod_timer(&x25->timer, jiffies + x25->t23);
}

void x25_stop_timer(struct sock *sk)
{
	del_timer(&x25_sk(sk)->timer);
}

unsigned long x25_display_timer(struct sock *sk)
{
	struct x25_sock *x25 = x25_sk(sk);

	if (!timer_pending(&x25->timer))
		return 0;

	return x25->timer.expires - jiffies;
}

static void x25_heartbeat_expiry(unsigned long param)
{
	struct sock *sk = (struct sock *)param;

	bh_lock_sock(sk);
	if (sock_owned_by_user(sk)) /* can currently only occur in state 3 */
		goto restart_heartbeat;

	switch (x25_sk(sk)->state) {

		case X25_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);
				x25_destroy_socket_from_timer(sk);
				return;
			}
			break;

		case X25_STATE_3:
			/*
			 * Check for the state of the receive buffer.
			 */
			x25_check_rbuf(sk);
			break;
	}
restart_heartbeat:
	x25_start_heartbeat(sk);
	bh_unlock_sock(sk);
}

/*
 *	Timer has expired, it may have been T2, T21, T22, or T23. We can tell
 *	by the state machine state.
 */
static inline void x25_do_timer_expiry(struct sock * sk)
{
	struct x25_sock *x25 = x25_sk(sk);

	switch (x25->state) {

		case X25_STATE_3:	/* T2 */
			if (x25->condition & X25_COND_ACK_PENDING) {
				x25->condition &= ~X25_COND_ACK_PENDING;
				x25_enquiry_response(sk);
			}
			break;

		case X25_STATE_1:	/* T21 */
		case X25_STATE_4:	/* T22 */
			x25_write_internal(sk, X25_CLEAR_REQUEST);
			x25->state = X25_STATE_2;
			x25_start_t23timer(sk);
			break;

		case X25_STATE_2:	/* T23 */
			x25_disconnect(sk, ETIMEDOUT, 0, 0);
			break;
	}
}

static void x25_timer_expiry(unsigned long param)
{
	struct sock *sk = (struct sock *)param;

	bh_lock_sock(sk);
	if (sock_owned_by_user(sk)) { /* can currently only occur in state 3 */
		if (x25_sk(sk)->state == X25_STATE_3)
			x25_start_t2timer(sk);
	} else
		x25_do_timer_expiry(sk);
	bh_unlock_sock(sk);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* X.25 Packet Layer release 002
	3	*
	4	* This is ALPHA test software. This code may break your machine,
	5	* randomly fail to work with new releases, misbehave and/or generally
f8e1d201	6	* screw up. It might even work.
1da177e4 LT	7	*
	8	* This code REQUIRES 2.1.15 or higher
	9	*
	10	* This module:
	11	* This module is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* as published by the Free Software Foundation; either version
	14	* 2 of the License, or (at your option) any later version.
	15	*
	16	* History
	17	* X.25 001 Jonathan Naylor Started coding.
	18	* X.25 002 Jonathan Naylor New timer architecture.
	19	* Centralised disconnection processing.
	20	*/
	21
	22	#include <linux/errno.h>
	23	#include <linux/jiffies.h>
	24	#include <linux/timer.h>
	25	#include <net/sock.h>
c752f073	26	#include <net/tcp_states.h>
1da177e4 LT	27	#include <net/x25.h>
	28
	29	static void x25_heartbeat_expiry(unsigned long);
	30	static void x25_timer_expiry(unsigned long);
	31
	32	void x25_init_timers(struct sock *sk)
	33	{
	34	struct x25_sock *x25 = x25_sk(sk);
	35
b24b8a24	36	setup_timer(&x25->timer, x25_timer_expiry, (unsigned long)sk);
1da177e4 LT	37
	38	/* initialized by sock_init_data */
	39	sk->sk_timer.data = (unsigned long)sk;
	40	sk->sk_timer.function = &x25_heartbeat_expiry;
	41	}
	42
	43	void x25_start_heartbeat(struct sock *sk)
	44	{
	45	mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
	46	}
	47
	48	void x25_stop_heartbeat(struct sock *sk)
	49	{
	50	del_timer(&sk->sk_timer);
	51	}
	52
	53	void x25_start_t2timer(struct sock *sk)
	54	{
	55	struct x25_sock *x25 = x25_sk(sk);
	56
	57	mod_timer(&x25->timer, jiffies + x25->t2);
	58	}
	59
	60	void x25_start_t21timer(struct sock *sk)
	61	{
	62	struct x25_sock *x25 = x25_sk(sk);
	63
	64	mod_timer(&x25->timer, jiffies + x25->t21);
	65	}
	66
	67	void x25_start_t22timer(struct sock *sk)
	68	{
	69	struct x25_sock *x25 = x25_sk(sk);
	70
	71	mod_timer(&x25->timer, jiffies + x25->t22);
	72	}
	73
	74	void x25_start_t23timer(struct sock *sk)
	75	{
	76	struct x25_sock *x25 = x25_sk(sk);
	77
	78	mod_timer(&x25->timer, jiffies + x25->t23);
	79	}
	80
	81	void x25_stop_timer(struct sock *sk)
	82	{
	83	del_timer(&x25_sk(sk)->timer);
	84	}
	85
	86	unsigned long x25_display_timer(struct sock *sk)
	87	{
	88	struct x25_sock *x25 = x25_sk(sk);
	89
	90	if (!timer_pending(&x25->timer))
	91	return 0;
	92
	93	return x25->timer.expires - jiffies;
	94	}
	95
	96	static void x25_heartbeat_expiry(unsigned long param)
	97	{
	98	struct sock sk = (struct sock )param;
	99
f8e1d201 YH	100	bh_lock_sock(sk);
f8e1d201 YH	101	if (sock_owned_by_user(sk)) /* can currently only occur in state 3 */
1da177e4 LT	102	goto restart_heartbeat;
	103
	104	switch (x25_sk(sk)->state) {
	105
	106	case X25_STATE_0:
	107	/*
	108	* Magic here: If we listen() and a new link dies
	109	* before it is accepted() it isn't 'dead' so doesn't
	110	* get removed.
	111	*/
	112	if (sock_flag(sk, SOCK_DESTROY) \|\|
	113	(sk->sk_state == TCP_LISTEN &&
	114	sock_flag(sk, SOCK_DEAD))) {
43dff98b	115	bh_unlock_sock(sk);
14ebaf81	116	x25_destroy_socket_from_timer(sk);
43dff98b	117	return;
1da177e4 LT	118	}
	119	break;
	120
	121	case X25_STATE_3:
	122	/*
	123	* Check for the state of the receive buffer.
	124	*/
	125	x25_check_rbuf(sk);
	126	break;
	127	}
	128	restart_heartbeat:
	129	x25_start_heartbeat(sk);
1da177e4 LT	130	bh_unlock_sock(sk);
	131	}
	132
	133	/*
	134	* Timer has expired, it may have been T2, T21, T22, or T23. We can tell
	135	* by the state machine state.
	136	*/
	137	static inline void x25_do_timer_expiry(struct sock * sk)
	138	{
	139	struct x25_sock *x25 = x25_sk(sk);
	140
	141	switch (x25->state) {
	142
	143	case X25_STATE_3: /* T2 */
	144	if (x25->condition & X25_COND_ACK_PENDING) {
	145	x25->condition &= ~X25_COND_ACK_PENDING;
	146	x25_enquiry_response(sk);
	147	}
	148	break;
	149
	150	case X25_STATE_1: /* T21 */
	151	case X25_STATE_4: /* T22 */
	152	x25_write_internal(sk, X25_CLEAR_REQUEST);
	153	x25->state = X25_STATE_2;
	154	x25_start_t23timer(sk);
	155	break;
	156
	157	case X25_STATE_2: /* T23 */
	158	x25_disconnect(sk, ETIMEDOUT, 0, 0);
	159	break;
	160	}
	161	}
	162
	163	static void x25_timer_expiry(unsigned long param)
	164	{
	165	struct sock sk = (struct sock )param;
	166
	167	bh_lock_sock(sk);
	168	if (sock_owned_by_user(sk)) { /* can currently only occur in state 3 */
	169	if (x25_sk(sk)->state == X25_STATE_3)
	170	x25_start_t2timer(sk);
	171	} else
	172	x25_do_timer_expiry(sk);
	173	bh_unlock_sock(sk);
	174	}