[mirror_ubuntu-eoan-kernel.git] / net / netrom / nr_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/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);

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

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

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

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

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

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

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

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

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

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

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

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

void nr_stop_heartbeat(struct sock *sk)
{
	sk_stop_timer(sk, &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
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>
dc8e5416	23	#include <linux/uaccess.h>
1da177e4 LT	24	#include <linux/fcntl.h>
	25	#include <linux/mm.h>
	26	#include <linux/interrupt.h>
	27	#include <net/netrom.h>
	28
99767f27 KC	29	static void nr_heartbeat_expiry(struct timer_list *);
	30	static void nr_t1timer_expiry(struct timer_list *);
	31	static void nr_t2timer_expiry(struct timer_list *);
	32	static void nr_t4timer_expiry(struct timer_list *);
	33	static void nr_idletimer_expiry(struct timer_list *);
1da177e4 LT	34
	35	void nr_init_timers(struct sock *sk)
	36	{
	37	struct nr_sock *nr = nr_sk(sk);
	38
99767f27 KC	39	timer_setup(&nr->t1timer, nr_t1timer_expiry, 0);
	40	timer_setup(&nr->t2timer, nr_t2timer_expiry, 0);
	41	timer_setup(&nr->t4timer, nr_t4timer_expiry, 0);
	42	timer_setup(&nr->idletimer, nr_idletimer_expiry, 0);
1da177e4 LT	43
1da177e4 LT	44	/* initialized by sock_init_data */
841b86f3	45	sk->sk_timer.function = nr_heartbeat_expiry;
1da177e4 LT	46	}
	47
	48	void nr_start_t1timer(struct sock *sk)
	49	{
	50	struct nr_sock *nr = nr_sk(sk);
	51
63346650	52	sk_reset_timer(sk, &nr->t1timer, jiffies + nr->t1);
1da177e4 LT	53	}
	54
	55	void nr_start_t2timer(struct sock *sk)
	56	{
	57	struct nr_sock *nr = nr_sk(sk);
	58
63346650	59	sk_reset_timer(sk, &nr->t2timer, jiffies + nr->t2);
1da177e4 LT	60	}
	61
	62	void nr_start_t4timer(struct sock *sk)
	63	{
	64	struct nr_sock *nr = nr_sk(sk);
	65
63346650	66	sk_reset_timer(sk, &nr->t4timer, jiffies + nr->t4);
1da177e4 LT	67	}
	68
	69	void nr_start_idletimer(struct sock *sk)
	70	{
	71	struct nr_sock *nr = nr_sk(sk);
	72
	73	if (nr->idle > 0)
63346650	74	sk_reset_timer(sk, &nr->idletimer, jiffies + nr->idle);
1da177e4 LT	75	}
	76
	77	void nr_start_heartbeat(struct sock *sk)
	78	{
63346650	79	sk_reset_timer(sk, &sk->sk_timer, jiffies + 5 * HZ);
1da177e4 LT	80	}
	81
	82	void nr_stop_t1timer(struct sock *sk)
	83	{
63346650	84	sk_stop_timer(sk, &nr_sk(sk)->t1timer);
1da177e4 LT	85	}
	86
	87	void nr_stop_t2timer(struct sock *sk)
	88	{
63346650	89	sk_stop_timer(sk, &nr_sk(sk)->t2timer);
1da177e4 LT	90	}
	91
	92	void nr_stop_t4timer(struct sock *sk)
	93	{
63346650	94	sk_stop_timer(sk, &nr_sk(sk)->t4timer);
1da177e4 LT	95	}
	96
	97	void nr_stop_idletimer(struct sock *sk)
	98	{
63346650	99	sk_stop_timer(sk, &nr_sk(sk)->idletimer);
1da177e4 LT	100	}
	101
	102	void nr_stop_heartbeat(struct sock *sk)
	103	{
63346650	104	sk_stop_timer(sk, &sk->sk_timer);
1da177e4 LT	105	}
	106
	107	int nr_t1timer_running(struct sock *sk)
	108	{
	109	return timer_pending(&nr_sk(sk)->t1timer);
	110	}
	111
99767f27	112	static void nr_heartbeat_expiry(struct timer_list *t)
1da177e4	113	{
99767f27	114	struct sock *sk = from_timer(sk, t, sk_timer);
1da177e4 LT	115	struct nr_sock *nr = nr_sk(sk);
	116
	117	bh_lock_sock(sk);
	118	switch (nr->state) {
	119	case NR_STATE_0:
	120	/* Magic here: If we listen() and a new link dies before it
	121	is accepted() it isn't 'dead' so doesn't get removed. */
	122	if (sock_flag(sk, SOCK_DESTROY) \|\|
	123	(sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
	124	sock_hold(sk);
1da177e4	125	bh_unlock_sock(sk);
8bf2b7b1	126	nr_destroy_socket(sk);
1da177e4 LT	127	sock_put(sk);
	128	return;
	129	}
	130	break;
	131
	132	case NR_STATE_3:
	133	/*
	134	* Check for the state of the receive buffer.
	135	*/
	136	if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
	137	(nr->condition & NR_COND_OWN_RX_BUSY)) {
	138	nr->condition &= ~NR_COND_OWN_RX_BUSY;
	139	nr->condition &= ~NR_COND_ACK_PENDING;
	140	nr->vl = nr->vr;
	141	nr_write_internal(sk, NR_INFOACK);
	142	break;
	143	}
	144	break;
	145	}
	146
	147	nr_start_heartbeat(sk);
	148	bh_unlock_sock(sk);
	149	}
	150
99767f27	151	static void nr_t2timer_expiry(struct timer_list *t)
1da177e4	152	{
99767f27 KC	153	struct nr_sock *nr = from_timer(nr, t, t2timer);
99767f27 KC	154	struct sock *sk = &nr->sock;
1da177e4 LT	155
	156	bh_lock_sock(sk);
	157	if (nr->condition & NR_COND_ACK_PENDING) {
	158	nr->condition &= ~NR_COND_ACK_PENDING;
	159	nr_enquiry_response(sk);
	160	}
	161	bh_unlock_sock(sk);
	162	}
	163
99767f27	164	static void nr_t4timer_expiry(struct timer_list *t)
1da177e4	165	{
99767f27 KC	166	struct nr_sock *nr = from_timer(nr, t, t4timer);
99767f27 KC	167	struct sock *sk = &nr->sock;
1da177e4 LT	168
	169	bh_lock_sock(sk);
	170	nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
	171	bh_unlock_sock(sk);
	172	}
	173
99767f27	174	static void nr_idletimer_expiry(struct timer_list *t)
1da177e4	175	{
99767f27 KC	176	struct nr_sock *nr = from_timer(nr, t, idletimer);
99767f27 KC	177	struct sock *sk = &nr->sock;
1da177e4 LT	178
	179	bh_lock_sock(sk);
	180
	181	nr_clear_queues(sk);
	182
	183	nr->n2count = 0;
	184	nr_write_internal(sk, NR_DISCREQ);
	185	nr->state = NR_STATE_2;
	186
	187	nr_start_t1timer(sk);
	188	nr_stop_t2timer(sk);
	189	nr_stop_t4timer(sk);
	190
	191	sk->sk_state = TCP_CLOSE;
	192	sk->sk_err = 0;
	193	sk->sk_shutdown \|= SEND_SHUTDOWN;
	194
	195	if (!sock_flag(sk, SOCK_DEAD)) {
	196	sk->sk_state_change(sk);
	197	sock_set_flag(sk, SOCK_DEAD);
	198	}
	199	bh_unlock_sock(sk);
	200	}
	201
99767f27	202	static void nr_t1timer_expiry(struct timer_list *t)
1da177e4	203	{
99767f27 KC	204	struct nr_sock *nr = from_timer(nr, t, t1timer);
99767f27 KC	205	struct sock *sk = &nr->sock;
1da177e4 LT	206
	207	bh_lock_sock(sk);
	208	switch (nr->state) {
	209	case NR_STATE_1:
	210	if (nr->n2count == nr->n2) {
	211	nr_disconnect(sk, ETIMEDOUT);
	212	bh_unlock_sock(sk);
	213	return;
	214	} else {
	215	nr->n2count++;
	216	nr_write_internal(sk, NR_CONNREQ);
	217	}
	218	break;
	219
	220	case NR_STATE_2:
	221	if (nr->n2count == nr->n2) {
	222	nr_disconnect(sk, ETIMEDOUT);
	223	bh_unlock_sock(sk);
	224	return;
	225	} else {
	226	nr->n2count++;
	227	nr_write_internal(sk, NR_DISCREQ);
	228	}
	229	break;
	230
	231	case NR_STATE_3:
	232	if (nr->n2count == nr->n2) {
	233	nr_disconnect(sk, ETIMEDOUT);
	234	bh_unlock_sock(sk);
	235	return;
	236	} else {
	237	nr->n2count++;
	238	nr_requeue_frames(sk);
	239	}
	240	break;
	241	}
	242
	243	nr_start_t1timer(sk);
	244	bh_unlock_sock(sk);
	245	}