[net-next-2.6.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 <asm/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/netrom.h>

static void nr_heartbeat_expiry(unsigned long);
static void nr_t1timer_expiry(unsigned long);
static void nr_t2timer_expiry(unsigned long);
static void nr_t4timer_expiry(unsigned long);
static void nr_idletimer_expiry(unsigned long);

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

	setup_timer(&nr->t1timer, nr_t1timer_expiry, (unsigned long)sk);
	setup_timer(&nr->t2timer, nr_t2timer_expiry, (unsigned long)sk);
	setup_timer(&nr->t4timer, nr_t4timer_expiry, (unsigned long)sk);
	setup_timer(&nr->idletimer, nr_idletimer_expiry, (unsigned long)sk);

	/* initialized by sock_init_data */
	sk->sk_timer.data     = (unsigned long)sk;
	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(unsigned long param)
{
	struct sock *sk = (struct sock *)param;
	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(unsigned long param)
{
	struct sock *sk = (struct sock *)param;
	struct nr_sock *nr = nr_sk(sk);

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

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

static void nr_idletimer_expiry(unsigned long param)
{
	struct sock *sk = (struct sock *)param;
	struct nr_sock *nr = nr_sk(sk);

	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(unsigned long param)
{
	struct sock *sk = (struct sock *)param;
	struct nr_sock *nr = nr_sk(sk);

	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>
1da177e4 LT	26	#include <asm/uaccess.h>
	27	#include <asm/system.h>
	28	#include <linux/fcntl.h>
	29	#include <linux/mm.h>
	30	#include <linux/interrupt.h>
	31	#include <net/netrom.h>
	32
	33	static void nr_heartbeat_expiry(unsigned long);
	34	static void nr_t1timer_expiry(unsigned long);
	35	static void nr_t2timer_expiry(unsigned long);
	36	static void nr_t4timer_expiry(unsigned long);
	37	static void nr_idletimer_expiry(unsigned long);
	38
	39	void nr_init_timers(struct sock *sk)
	40	{
	41	struct nr_sock *nr = nr_sk(sk);
	42
b24b8a24 PE	43	setup_timer(&nr->t1timer, nr_t1timer_expiry, (unsigned long)sk);
	44	setup_timer(&nr->t2timer, nr_t2timer_expiry, (unsigned long)sk);
	45	setup_timer(&nr->t4timer, nr_t4timer_expiry, (unsigned long)sk);
	46	setup_timer(&nr->idletimer, nr_idletimer_expiry, (unsigned long)sk);
1da177e4 LT	47
	48	/* initialized by sock_init_data */
	49	sk->sk_timer.data = (unsigned long)sk;
	50	sk->sk_timer.function = &nr_heartbeat_expiry;
	51	}
	52
	53	void nr_start_t1timer(struct sock *sk)
	54	{
	55	struct nr_sock *nr = nr_sk(sk);
	56
	57	mod_timer(&nr->t1timer, jiffies + nr->t1);
	58	}
	59
	60	void nr_start_t2timer(struct sock *sk)
	61	{
	62	struct nr_sock *nr = nr_sk(sk);
	63
	64	mod_timer(&nr->t2timer, jiffies + nr->t2);
	65	}
	66
	67	void nr_start_t4timer(struct sock *sk)
	68	{
	69	struct nr_sock *nr = nr_sk(sk);
	70
	71	mod_timer(&nr->t4timer, jiffies + nr->t4);
	72	}
	73
	74	void nr_start_idletimer(struct sock *sk)
	75	{
	76	struct nr_sock *nr = nr_sk(sk);
	77
	78	if (nr->idle > 0)
	79	mod_timer(&nr->idletimer, jiffies + nr->idle);
	80	}
	81
	82	void nr_start_heartbeat(struct sock *sk)
	83	{
	84	mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
	85	}
	86
	87	void nr_stop_t1timer(struct sock *sk)
	88	{
	89	del_timer(&nr_sk(sk)->t1timer);
	90	}
	91
	92	void nr_stop_t2timer(struct sock *sk)
	93	{
	94	del_timer(&nr_sk(sk)->t2timer);
	95	}
	96
	97	void nr_stop_t4timer(struct sock *sk)
	98	{
	99	del_timer(&nr_sk(sk)->t4timer);
	100	}
	101
	102	void nr_stop_idletimer(struct sock *sk)
	103	{
	104	del_timer(&nr_sk(sk)->idletimer);
	105	}
	106
	107	void nr_stop_heartbeat(struct sock *sk)
	108	{
	109	del_timer(&sk->sk_timer);
	110	}
111
112	int nr_t1timer_running(struct sock *sk)
113	{
114	return timer_pending(&nr_sk(sk)->t1timer);
115	}
116
117	static void nr_heartbeat_expiry(unsigned long param)
118	{
119	struct sock sk = (struct sock )param;
120	struct nr_sock *nr = nr_sk(sk);
121
122	bh_lock_sock(sk);
123	switch (nr->state) {
124	case NR_STATE_0:
125	/* Magic here: If we listen() and a new link dies before it
126	is accepted() it isn't 'dead' so doesn't get removed. */
127	if (sock_flag(sk, SOCK_DESTROY) \|\|
128	(sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
129	sock_hold(sk);
1da177e4	130	bh_unlock_sock(sk);
8bf2b7b1	131	nr_destroy_socket(sk);
1da177e4 LT	132	sock_put(sk);
	133	return;
	134	}
	135	break;
	136
	137	case NR_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	(nr->condition & NR_COND_OWN_RX_BUSY)) {
	143	nr->condition &= ~NR_COND_OWN_RX_BUSY;
	144	nr->condition &= ~NR_COND_ACK_PENDING;
	145	nr->vl = nr->vr;
	146	nr_write_internal(sk, NR_INFOACK);
	147	break;
	148	}
	149	break;
	150	}
	151
	152	nr_start_heartbeat(sk);
	153	bh_unlock_sock(sk);
	154	}
	155
	156	static void nr_t2timer_expiry(unsigned long param)
	157	{
	158	struct sock sk = (struct sock )param;
	159	struct nr_sock *nr = nr_sk(sk);
	160
	161	bh_lock_sock(sk);
	162	if (nr->condition & NR_COND_ACK_PENDING) {
	163	nr->condition &= ~NR_COND_ACK_PENDING;
	164	nr_enquiry_response(sk);
	165	}
	166	bh_unlock_sock(sk);
	167	}
	168
	169	static void nr_t4timer_expiry(unsigned long param)
	170	{
	171	struct sock sk = (struct sock )param;
	172
	173	bh_lock_sock(sk);
	174	nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
	175	bh_unlock_sock(sk);
	176	}
	177
	178	static void nr_idletimer_expiry(unsigned long param)
	179	{
	180	struct sock sk = (struct sock )param;
	181	struct nr_sock *nr = nr_sk(sk);
	182
	183	bh_lock_sock(sk);
	184
	185	nr_clear_queues(sk);
	186
	187	nr->n2count = 0;
	188	nr_write_internal(sk, NR_DISCREQ);
	189	nr->state = NR_STATE_2;
	190
	191	nr_start_t1timer(sk);
	192	nr_stop_t2timer(sk);
	193	nr_stop_t4timer(sk);
	194
	195	sk->sk_state = TCP_CLOSE;
196	sk->sk_err = 0;
197	sk->sk_shutdown \|= SEND_SHUTDOWN;
198
199	if (!sock_flag(sk, SOCK_DEAD)) {
200	sk->sk_state_change(sk);
201	sock_set_flag(sk, SOCK_DEAD);
202	}
203	bh_unlock_sock(sk);
204	}
205
206	static void nr_t1timer_expiry(unsigned long param)
207	{
208	struct sock sk = (struct sock )param;
209	struct nr_sock *nr = nr_sk(sk);
210
211	bh_lock_sock(sk);
212	switch (nr->state) {
213	case NR_STATE_1:
214	if (nr->n2count == nr->n2) {
215	nr_disconnect(sk, ETIMEDOUT);
216	bh_unlock_sock(sk);
217	return;
218	} else {
219	nr->n2count++;
220	nr_write_internal(sk, NR_CONNREQ);
221	}
222	break;
223
224	case NR_STATE_2:
225	if (nr->n2count == nr->n2) {
226	nr_disconnect(sk, ETIMEDOUT);
227	bh_unlock_sock(sk);
228	return;
229	} else {
230	nr->n2count++;
231	nr_write_internal(sk, NR_DISCREQ);
232	}
233	break;
234
235	case NR_STATE_3:
236	if (nr->n2count == nr->n2) {
237	nr_disconnect(sk, ETIMEDOUT);
238	bh_unlock_sock(sk);
239	return;
240	} else {
241	nr->n2count++;
242	nr_requeue_frames(sk);
243	}
244	break;
245	}
246
247	nr_start_t1timer(sk);
248	bh_unlock_sock(sk);
249	}