[mirror_ubuntu-artful-kernel.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 (alan@lxorguk.ukuu.org.uk)
 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
 */
#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 <asm/system.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:
		if (!sk ||
		    sock_flag(sk, SOCK_DESTROY) ||
		    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 (alan@lxorguk.ukuu.org.uk)
	8	* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
	9	* Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
	10	* Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
	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 LT	27	#include <asm/uaccess.h>
	28	#include <asm/system.h>
	29	#include <linux/fcntl.h>
	30	#include <linux/mm.h>
	31	#include <linux/interrupt.h>
	32
	33	void ax25_std_heartbeat_expiry(ax25_cb *ax25)
	34	{
f16f3026	35	struct sock *sk = ax25->sk;
528930b9	36
1da177e4 LT	37	if (sk)
	38	bh_lock_sock(sk);
	39
	40	switch (ax25->state) {
	41	case AX25_STATE_0:
30902dc3 DM	42	if (!sk \|\|
	43	sock_flag(sk, SOCK_DESTROY) \|\|
	44	sock_flag(sk, SOCK_DEAD)) {
1da177e4 LT	45	if (sk) {
	46	sock_hold(sk);
	47	ax25_destroy_socket(ax25);
	48	bh_unlock_sock(sk);
	49	sock_put(sk);
	50	} else
	51	ax25_destroy_socket(ax25);
	52	return;
	53	}
	54	break;
	55
	56	case AX25_STATE_3:
	57	case AX25_STATE_4:
	58	/*
	59	* Check the state of the receive buffer.
	60	*/
	61	if (sk != NULL) {
	62	if (atomic_read(&sk->sk_rmem_alloc) <
f16f3026	63	(sk->sk_rcvbuf >> 1) &&
1da177e4 LT	64	(ax25->condition & AX25_COND_OWN_RX_BUSY)) {
	65	ax25->condition &= ~AX25_COND_OWN_RX_BUSY;
	66	ax25->condition &= ~AX25_COND_ACK_PENDING;
	67	ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
	68	break;
	69	}
	70	}
	71	}
	72
	73	if (sk)
	74	bh_unlock_sock(sk);
	75
	76	ax25_start_heartbeat(ax25);
	77	}
	78
	79	void ax25_std_t2timer_expiry(ax25_cb *ax25)
	80	{
	81	if (ax25->condition & AX25_COND_ACK_PENDING) {
	82	ax25->condition &= ~AX25_COND_ACK_PENDING;
	83	ax25_std_timeout_response(ax25);
	84	}
	85	}
	86
	87	void ax25_std_t3timer_expiry(ax25_cb *ax25)
	88	{
	89	ax25->n2count = 0;
	90	ax25_std_transmit_enquiry(ax25);
	91	ax25->state = AX25_STATE_4;
	92	}
	93
	94	void ax25_std_idletimer_expiry(ax25_cb *ax25)
	95	{
	96	ax25_clear_queues(ax25);
	97
	98	ax25->n2count = 0;
	99	ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
	100	ax25->state = AX25_STATE_2;
	101
	102	ax25_calculate_t1(ax25);
	103	ax25_start_t1timer(ax25);
	104	ax25_stop_t2timer(ax25);
	105	ax25_stop_t3timer(ax25);
	106
	107	if (ax25->sk != NULL) {
	108	bh_lock_sock(ax25->sk);
	109	ax25->sk->sk_state = TCP_CLOSE;
	110	ax25->sk->sk_err = 0;
	111	ax25->sk->sk_shutdown \|= SEND_SHUTDOWN;
	112	if (!sock_flag(ax25->sk, SOCK_DEAD)) {
	113	ax25->sk->sk_state_change(ax25->sk);
	114	sock_set_flag(ax25->sk, SOCK_DEAD);
	115	}
	116	bh_unlock_sock(ax25->sk);
	117	}
	118	}
	119
	120	void ax25_std_t1timer_expiry(ax25_cb *ax25)
	121	{
	122	switch (ax25->state) {
	123	case AX25_STATE_1:
	124	if (ax25->n2count == ax25->n2) {
	125	if (ax25->modulus == AX25_MODULUS) {
	126	ax25_disconnect(ax25, ETIMEDOUT);
	127	return;
128	} else {
129	ax25->modulus = AX25_MODULUS;
130	ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
131	ax25->n2count = 0;
132	ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
133	}
134	} else {
135	ax25->n2count++;
136	if (ax25->modulus == AX25_MODULUS)
137	ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
138	else
139	ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND);
140	}
141	break;
142
143	case AX25_STATE_2:
144	if (ax25->n2count == ax25->n2) {
145	ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
146	ax25_disconnect(ax25, ETIMEDOUT);
147	return;
148	} else {
149	ax25->n2count++;
150	ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
151	}
152	break;
153
154	case AX25_STATE_3:
155	ax25->n2count = 1;
156	ax25_std_transmit_enquiry(ax25);
157	ax25->state = AX25_STATE_4;
158	break;
159
160	case AX25_STATE_4:
161	if (ax25->n2count == ax25->n2) {
162	ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
163	ax25_disconnect(ax25, ETIMEDOUT);
164	return;
165	} else {
166	ax25->n2count++;
167	ax25_std_transmit_enquiry(ax25);
168	}
169	break;
170	}
171
172	ax25_calculate_t1(ax25);
173	ax25_start_t1timer(ax25);
174	}