[mirror_ubuntu-jammy-kernel.git] / net / rose / rose_timer.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *
 * 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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4	2	/*
1da177e4 LT	3	*
	4	* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
	5	* Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
	6	*/
	7	#include <linux/errno.h>
	8	#include <linux/types.h>
	9	#include <linux/socket.h>
	10	#include <linux/in.h>
	11	#include <linux/kernel.h>
	12	#include <linux/jiffies.h>
	13	#include <linux/timer.h>
	14	#include <linux/string.h>
	15	#include <linux/sockios.h>
	16	#include <linux/net.h>
	17	#include <net/ax25.h>
	18	#include <linux/inet.h>
	19	#include <linux/netdevice.h>
	20	#include <linux/skbuff.h>
	21	#include <net/sock.h>
c752f073	22	#include <net/tcp_states.h>
1da177e4 LT	23	#include <linux/fcntl.h>
	24	#include <linux/mm.h>
	25	#include <linux/interrupt.h>
	26	#include <net/rose.h>
	27
99767f27	28	static void rose_heartbeat_expiry(struct timer_list *t);
4966babd KC	29	static void rose_timer_expiry(struct timer_list *);
4966babd KC	30	static void rose_idletimer_expiry(struct timer_list *);
1da177e4 LT	31
	32	void rose_start_heartbeat(struct sock *sk)
	33	{
	34	del_timer(&sk->sk_timer);
	35
841b86f3	36	sk->sk_timer.function = rose_heartbeat_expiry;
1da177e4 LT	37	sk->sk_timer.expires = jiffies + 5 * HZ;
	38
	39	add_timer(&sk->sk_timer);
	40	}
	41
	42	void rose_start_t1timer(struct sock *sk)
	43	{
	44	struct rose_sock *rose = rose_sk(sk);
	45
	46	del_timer(&rose->timer);
	47
841b86f3	48	rose->timer.function = rose_timer_expiry;
1da177e4 LT	49	rose->timer.expires = jiffies + rose->t1;
	50
	51	add_timer(&rose->timer);
	52	}
	53
	54	void rose_start_t2timer(struct sock *sk)
	55	{
	56	struct rose_sock *rose = rose_sk(sk);
	57
	58	del_timer(&rose->timer);
	59
841b86f3	60	rose->timer.function = rose_timer_expiry;
1da177e4 LT	61	rose->timer.expires = jiffies + rose->t2;
	62
	63	add_timer(&rose->timer);
	64	}
	65
	66	void rose_start_t3timer(struct sock *sk)
	67	{
	68	struct rose_sock *rose = rose_sk(sk);
	69
	70	del_timer(&rose->timer);
	71
841b86f3	72	rose->timer.function = rose_timer_expiry;
1da177e4 LT	73	rose->timer.expires = jiffies + rose->t3;
	74
	75	add_timer(&rose->timer);
	76	}
	77
	78	void rose_start_hbtimer(struct sock *sk)
	79	{
	80	struct rose_sock *rose = rose_sk(sk);
	81
	82	del_timer(&rose->timer);
	83
841b86f3	84	rose->timer.function = rose_timer_expiry;
1da177e4 LT	85	rose->timer.expires = jiffies + rose->hb;
	86
	87	add_timer(&rose->timer);
	88	}
	89
	90	void rose_start_idletimer(struct sock *sk)
	91	{
	92	struct rose_sock *rose = rose_sk(sk);
	93
	94	del_timer(&rose->idletimer);
	95
	96	if (rose->idle > 0) {
841b86f3	97	rose->idletimer.function = rose_idletimer_expiry;
1da177e4 LT	98	rose->idletimer.expires = jiffies + rose->idle;
	99
	100	add_timer(&rose->idletimer);
	101	}
	102	}
	103
	104	void rose_stop_heartbeat(struct sock *sk)
	105	{
	106	del_timer(&sk->sk_timer);
	107	}
	108
	109	void rose_stop_timer(struct sock *sk)
	110	{
	111	del_timer(&rose_sk(sk)->timer);
	112	}
	113
	114	void rose_stop_idletimer(struct sock *sk)
	115	{
	116	del_timer(&rose_sk(sk)->idletimer);
	117	}
	118
99767f27	119	static void rose_heartbeat_expiry(struct timer_list *t)
1da177e4	120	{
99767f27	121	struct sock *sk = from_timer(sk, t, sk_timer);
1da177e4 LT	122	struct rose_sock *rose = rose_sk(sk);
	123
	124	bh_lock_sock(sk);
	125	switch (rose->state) {
	126	case ROSE_STATE_0:
	127	/* Magic here: If we listen() and a new link dies before it
	128	is accepted() it isn't 'dead' so doesn't get removed. */
	129	if (sock_flag(sk, SOCK_DESTROY) \|\|
	130	(sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
a3d7a9d7	131	bh_unlock_sock(sk);
1da177e4 LT	132	rose_destroy_socket(sk);
	133	return;
	134	}
	135	break;
	136
	137	case ROSE_STATE_3:
	138	/*
	139	* Check for the state of the receive buffer.
	140	*/
	141	if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
	142	(rose->condition & ROSE_COND_OWN_RX_BUSY)) {
	143	rose->condition &= ~ROSE_COND_OWN_RX_BUSY;
	144	rose->condition &= ~ROSE_COND_ACK_PENDING;
	145	rose->vl = rose->vr;
	146	rose_write_internal(sk, ROSE_RR);
	147	rose_stop_timer(sk); /* HB */
	148	break;
	149	}
	150	break;
	151	}
	152
	153	rose_start_heartbeat(sk);
	154	bh_unlock_sock(sk);
	155	}
	156
4966babd	157	static void rose_timer_expiry(struct timer_list *t)
1da177e4	158	{
4966babd KC	159	struct rose_sock *rose = from_timer(rose, t, timer);
4966babd KC	160	struct sock *sk = &rose->sock;
1da177e4 LT	161
	162	bh_lock_sock(sk);
	163	switch (rose->state) {
	164	case ROSE_STATE_1: /* T1 */
	165	case ROSE_STATE_4: /* T2 */
	166	rose_write_internal(sk, ROSE_CLEAR_REQUEST);
	167	rose->state = ROSE_STATE_2;
	168	rose_start_t3timer(sk);
	169	break;
	170
	171	case ROSE_STATE_2: /* T3 */
	172	rose->neighbour->use--;
	173	rose_disconnect(sk, ETIMEDOUT, -1, -1);
	174	break;
	175
	176	case ROSE_STATE_3: /* HB */
	177	if (rose->condition & ROSE_COND_ACK_PENDING) {
	178	rose->condition &= ~ROSE_COND_ACK_PENDING;
	179	rose_enquiry_response(sk);
	180	}
	181	break;
	182	}
	183	bh_unlock_sock(sk);
	184	}
	185
4966babd	186	static void rose_idletimer_expiry(struct timer_list *t)
1da177e4	187	{
4966babd KC	188	struct rose_sock *rose = from_timer(rose, t, idletimer);
4966babd KC	189	struct sock *sk = &rose->sock;
1da177e4 LT	190
	191	bh_lock_sock(sk);
	192	rose_clear_queues(sk);
	193
	194	rose_write_internal(sk, ROSE_CLEAR_REQUEST);
	195	rose_sk(sk)->state = ROSE_STATE_2;
	196
	197	rose_start_t3timer(sk);
	198
	199	sk->sk_state = TCP_CLOSE;
	200	sk->sk_err = 0;
	201	sk->sk_shutdown \|= SEND_SHUTDOWN;
	202
	203	if (!sock_flag(sk, SOCK_DEAD)) {
	204	sk->sk_state_change(sk);
	205	sock_set_flag(sk, SOCK_DEAD);
	206	}
	207	bh_unlock_sock(sk);
	208	}