[linux.git] / net / ax25 / ax25_std_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) Alan Cox GW4PTS ([email protected])
 * Copyright (C) Jonathan Naylor G4KLX ([email protected])
 * Copyright (C) Joerg Reuter DL1BKE ([email protected])
 * Copyright (C) Frederic Rible F1OAT ([email protected])
 */
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.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 <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>

void ax25_std_heartbeat_expiry(ax25_cb *ax25)
{
	struct sock *sk = ax25->sk;

	if (sk)
		bh_lock_sock(sk);

	switch (ax25->state) {
	case AX25_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 (!sk || sock_flag(sk, SOCK_DESTROY) ||
		    (sk->sk_state == TCP_LISTEN &&
		     sock_flag(sk, SOCK_DEAD))) {
			if (sk) {
				sock_hold(sk);
				ax25_destroy_socket(ax25);
				bh_unlock_sock(sk);
				sock_put(sk);
			} else
				ax25_destroy_socket(ax25);
			return;
		}
		break;

	case AX25_STATE_3:
	case AX25_STATE_4:
		/*
		 * Check the state of the receive buffer.
		 */
		if (sk != NULL) {
			if (atomic_read(&sk->sk_rmem_alloc) <
			    (sk->sk_rcvbuf >> 1) &&
			    (ax25->condition & AX25_COND_OWN_RX_BUSY)) {
				ax25->condition &= ~AX25_COND_OWN_RX_BUSY;
				ax25->condition &= ~AX25_COND_ACK_PENDING;
				ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
				break;
			}
		}
	}

	if (sk)
		bh_unlock_sock(sk);

	ax25_start_heartbeat(ax25);
}

void ax25_std_t2timer_expiry(ax25_cb *ax25)
{
	if (ax25->condition & AX25_COND_ACK_PENDING) {
		ax25->condition &= ~AX25_COND_ACK_PENDING;
		ax25_std_timeout_response(ax25);
	}
}

void ax25_std_t3timer_expiry(ax25_cb *ax25)
{
	ax25->n2count = 0;
	ax25_std_transmit_enquiry(ax25);
	ax25->state   = AX25_STATE_4;
}

void ax25_std_idletimer_expiry(ax25_cb *ax25)
{
	ax25_clear_queues(ax25);

	ax25->n2count = 0;
	ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
	ax25->state   = AX25_STATE_2;

	ax25_calculate_t1(ax25);
	ax25_start_t1timer(ax25);
	ax25_stop_t2timer(ax25);
	ax25_stop_t3timer(ax25);

	if (ax25->sk != NULL) {
		bh_lock_sock(ax25->sk);
		ax25->sk->sk_state     = TCP_CLOSE;
		ax25->sk->sk_err       = 0;
		ax25->sk->sk_shutdown |= SEND_SHUTDOWN;
		if (!sock_flag(ax25->sk, SOCK_DEAD)) {
			ax25->sk->sk_state_change(ax25->sk);
			sock_set_flag(ax25->sk, SOCK_DEAD);
		}
		bh_unlock_sock(ax25->sk);
	}
}

void ax25_std_t1timer_expiry(ax25_cb *ax25)
{
	switch (ax25->state) {
	case AX25_STATE_1:
		if (ax25->n2count == ax25->n2) {
			if (ax25->modulus == AX25_MODULUS) {
				ax25_disconnect(ax25, ETIMEDOUT);
				return;
			} else {
				ax25->modulus = AX25_MODULUS;
				ax25->window  = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
				ax25->n2count = 0;
				ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
			}
		} else {
			ax25->n2count++;
			if (ax25->modulus == AX25_MODULUS)
				ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
			else
				ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND);
		}
		break;

	case AX25_STATE_2:
		if (ax25->n2count == ax25->n2) {
			ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
			ax25_disconnect(ax25, ETIMEDOUT);
			return;
		} else {
			ax25->n2count++;
			ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
		}
		break;

	case AX25_STATE_3:
		ax25->n2count = 1;
		ax25_std_transmit_enquiry(ax25);
		ax25->state   = AX25_STATE_4;
		break;

	case AX25_STATE_4:
		if (ax25->n2count == ax25->n2) {
			ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
			ax25_disconnect(ax25, ETIMEDOUT);
			return;
		} else {
			ax25->n2count++;
			ax25_std_transmit_enquiry(ax25);
		}
		break;
	}

	ax25_calculate_t1(ax25);
	ax25_start_t1timer(ax25);
}
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) Alan Cox GW4PTS ([email protected])
	8	* Copyright (C) Jonathan Naylor G4KLX ([email protected])
	9	* Copyright (C) Joerg Reuter DL1BKE ([email protected])
	10	* Copyright (C) Frederic Rible F1OAT ([email protected])
	11	*/
	12	#include <linux/errno.h>
	13	#include <linux/types.h>
	14	#include <linux/socket.h>
	15	#include <linux/in.h>
	16	#include <linux/kernel.h>
1da177e4 LT	17	#include <linux/timer.h>
	18	#include <linux/string.h>
	19	#include <linux/sockios.h>
	20	#include <linux/net.h>
	21	#include <net/ax25.h>
	22	#include <linux/inet.h>
	23	#include <linux/netdevice.h>
	24	#include <linux/skbuff.h>
	25	#include <net/sock.h>
c752f073	26	#include <net/tcp_states.h>
1da177e4	27	#include <asm/uaccess.h>
1da177e4 LT	28	#include <linux/fcntl.h>
	29	#include <linux/mm.h>
	30	#include <linux/interrupt.h>
	31
	32	void ax25_std_heartbeat_expiry(ax25_cb *ax25)
	33	{
f16f3026	34	struct sock *sk = ax25->sk;
528930b9	35
1da177e4 LT	36	if (sk)
	37	bh_lock_sock(sk);
	38
	39	switch (ax25->state) {
	40	case AX25_STATE_0:
88a944ee DM	41	/* Magic here: If we listen() and a new link dies before it
	42	is accepted() it isn't 'dead' so doesn't get removed. */
	43	if (!sk \|\| sock_flag(sk, SOCK_DESTROY) \|\|
	44	(sk->sk_state == TCP_LISTEN &&
	45	sock_flag(sk, SOCK_DEAD))) {
1da177e4 LT	46	if (sk) {
	47	sock_hold(sk);
	48	ax25_destroy_socket(ax25);
	49	bh_unlock_sock(sk);
	50	sock_put(sk);
	51	} else
	52	ax25_destroy_socket(ax25);
	53	return;
	54	}
	55	break;
	56
	57	case AX25_STATE_3:
	58	case AX25_STATE_4:
	59	/*
	60	* Check the state of the receive buffer.
	61	*/
	62	if (sk != NULL) {
	63	if (atomic_read(&sk->sk_rmem_alloc) <
f16f3026	64	(sk->sk_rcvbuf >> 1) &&
1da177e4 LT	65	(ax25->condition & AX25_COND_OWN_RX_BUSY)) {
	66	ax25->condition &= ~AX25_COND_OWN_RX_BUSY;
	67	ax25->condition &= ~AX25_COND_ACK_PENDING;
	68	ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
	69	break;
	70	}
	71	}
	72	}
	73
	74	if (sk)
	75	bh_unlock_sock(sk);
	76
	77	ax25_start_heartbeat(ax25);
	78	}
	79
	80	void ax25_std_t2timer_expiry(ax25_cb *ax25)
	81	{
	82	if (ax25->condition & AX25_COND_ACK_PENDING) {
	83	ax25->condition &= ~AX25_COND_ACK_PENDING;
	84	ax25_std_timeout_response(ax25);
	85	}
	86	}
	87
	88	void ax25_std_t3timer_expiry(ax25_cb *ax25)
	89	{
	90	ax25->n2count = 0;
	91	ax25_std_transmit_enquiry(ax25);
	92	ax25->state = AX25_STATE_4;
	93	}
	94
	95	void ax25_std_idletimer_expiry(ax25_cb *ax25)
	96	{
	97	ax25_clear_queues(ax25);
	98
	99	ax25->n2count = 0;
	100	ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
	101	ax25->state = AX25_STATE_2;
	102
	103	ax25_calculate_t1(ax25);
	104	ax25_start_t1timer(ax25);
	105	ax25_stop_t2timer(ax25);
	106	ax25_stop_t3timer(ax25);
	107
	108	if (ax25->sk != NULL) {
	109	bh_lock_sock(ax25->sk);
	110	ax25->sk->sk_state = TCP_CLOSE;
	111	ax25->sk->sk_err = 0;
	112	ax25->sk->sk_shutdown \|= SEND_SHUTDOWN;
	113	if (!sock_flag(ax25->sk, SOCK_DEAD)) {
	114	ax25->sk->sk_state_change(ax25->sk);
	115	sock_set_flag(ax25->sk, SOCK_DEAD);
	116	}
	117	bh_unlock_sock(ax25->sk);
	118	}
	119	}
	120
	121	void ax25_std_t1timer_expiry(ax25_cb *ax25)
	122	{
	123	switch (ax25->state) {
	124	case AX25_STATE_1:
	125	if (ax25->n2count == ax25->n2) {
	126	if (ax25->modulus == AX25_MODULUS) {
	127	ax25_disconnect(ax25, ETIMEDOUT);
	128	return;
129	} else {
130	ax25->modulus = AX25_MODULUS;
131	ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
132	ax25->n2count = 0;
133	ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
134	}
135	} else {
136	ax25->n2count++;
137	if (ax25->modulus == AX25_MODULUS)
138	ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
139	else
140	ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND);
141	}
142	break;
143
144	case AX25_STATE_2:
145	if (ax25->n2count == ax25->n2) {
146	ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
147	ax25_disconnect(ax25, ETIMEDOUT);
148	return;
149	} else {
150	ax25->n2count++;
151	ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
152	}
153	break;
154
155	case AX25_STATE_3:
156	ax25->n2count = 1;
157	ax25_std_transmit_enquiry(ax25);
158	ax25->state = AX25_STATE_4;
159	break;
160
161	case AX25_STATE_4:
162	if (ax25->n2count == ax25->n2) {
163	ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
164	ax25_disconnect(ax25, ETIMEDOUT);
165	return;
166	} else {
167	ax25->n2count++;
168	ax25_std_transmit_enquiry(ax25);
169	}
170	break;
171	}
172
173	ax25_calculate_t1(ax25);
174	ax25_start_t1timer(ax25);
175	}