84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
*
|
|
* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
|
|
*/
|
|
#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 <linux/uaccess.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
/*
|
|
* The following routines are taken from page 170 of the 7th ARRL Computer
|
|
* Networking Conference paper, as is the whole state machine.
|
|
*/
|
|
|
|
void ax25_std_nr_error_recovery(ax25_cb *ax25)
|
|
{
|
|
ax25_std_establish_data_link(ax25);
|
|
}
|
|
|
|
void ax25_std_establish_data_link(ax25_cb *ax25)
|
|
{
|
|
ax25->condition = 0x00;
|
|
ax25->n2count = 0;
|
|
|
|
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);
|
|
|
|
ax25_calculate_t1(ax25);
|
|
ax25_stop_idletimer(ax25);
|
|
ax25_stop_t3timer(ax25);
|
|
ax25_stop_t2timer(ax25);
|
|
ax25_start_t1timer(ax25);
|
|
}
|
|
|
|
void ax25_std_transmit_enquiry(ax25_cb *ax25)
|
|
{
|
|
if (ax25->condition & AX25_COND_OWN_RX_BUSY)
|
|
ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_COMMAND);
|
|
else
|
|
ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_COMMAND);
|
|
|
|
ax25->condition &= ~AX25_COND_ACK_PENDING;
|
|
|
|
ax25_calculate_t1(ax25);
|
|
ax25_start_t1timer(ax25);
|
|
}
|
|
|
|
void ax25_std_enquiry_response(ax25_cb *ax25)
|
|
{
|
|
if (ax25->condition & AX25_COND_OWN_RX_BUSY)
|
|
ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_RESPONSE);
|
|
else
|
|
ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_RESPONSE);
|
|
|
|
ax25->condition &= ~AX25_COND_ACK_PENDING;
|
|
}
|
|
|
|
void ax25_std_timeout_response(ax25_cb *ax25)
|
|
{
|
|
if (ax25->condition & AX25_COND_OWN_RX_BUSY)
|
|
ax25_send_control(ax25, AX25_RNR, AX25_POLLOFF, AX25_RESPONSE);
|
|
else
|
|
ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
|
|
|
|
ax25->condition &= ~AX25_COND_ACK_PENDING;
|
|
}
|