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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/net/ax25/ax25_std_subr.c
15109 views
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/*

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 * This program is free software; you can redistribute it and/or modify

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 * it under the terms of the GNU General Public License as published by

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 * the Free Software Foundation; either version 2 of the License, or

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 * (at your option) any later version.

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 *

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 * Copyright (C) Jonathan Naylor G4KLX ([email protected])

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 */

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#include <linux/errno.h>

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#include <linux/types.h>

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#include <linux/socket.h>

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#include <linux/in.h>

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#include <linux/kernel.h>

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#include <linux/timer.h>

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#include <linux/string.h>

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#include <linux/sockios.h>

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#include <linux/net.h>

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#include <net/ax25.h>

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#include <linux/inet.h>

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#include <linux/netdevice.h>

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#include <linux/skbuff.h>

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#include <net/sock.h>

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#include <asm/uaccess.h>

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#include <asm/system.h>

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#include <linux/fcntl.h>

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#include <linux/mm.h>

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#include <linux/interrupt.h>

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/*

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 * The following routines are taken from page 170 of the 7th ARRL Computer

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 * Networking Conference paper, as is the whole state machine.

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 */

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void ax25_std_nr_error_recovery(ax25_cb *ax25)

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{

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	ax25_std_establish_data_link(ax25);

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}

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void ax25_std_establish_data_link(ax25_cb *ax25)

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{

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	ax25->condition = 0x00;

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	ax25->n2count   = 0;

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	if (ax25->modulus == AX25_MODULUS)

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		ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);

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	else

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		ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND);

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	ax25_calculate_t1(ax25);

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	ax25_stop_idletimer(ax25);

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	ax25_stop_t3timer(ax25);

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	ax25_stop_t2timer(ax25);

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	ax25_start_t1timer(ax25);

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}

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void ax25_std_transmit_enquiry(ax25_cb *ax25)

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{

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	if (ax25->condition & AX25_COND_OWN_RX_BUSY)

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		ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_COMMAND);

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	else

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		ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_COMMAND);

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	ax25->condition &= ~AX25_COND_ACK_PENDING;

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	ax25_calculate_t1(ax25);

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	ax25_start_t1timer(ax25);

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}

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void ax25_std_enquiry_response(ax25_cb *ax25)

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{

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	if (ax25->condition & AX25_COND_OWN_RX_BUSY)

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		ax25_send_control(ax25, AX25_RNR, AX25_POLLON, AX25_RESPONSE);

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	else

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		ax25_send_control(ax25, AX25_RR, AX25_POLLON, AX25_RESPONSE);

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	ax25->condition &= ~AX25_COND_ACK_PENDING;

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}

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void ax25_std_timeout_response(ax25_cb *ax25)

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{

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	if (ax25->condition & AX25_COND_OWN_RX_BUSY)

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		ax25_send_control(ax25, AX25_RNR, AX25_POLLOFF, AX25_RESPONSE);

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	else

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		ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);

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	ax25->condition &= ~AX25_COND_ACK_PENDING;

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}

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