Eric Lee / smarc-fsl-linux-kernel

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net/ax25/ax25_std_subr.c 2.27 KB
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1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  /*
   * 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)
   */
  #include <linux/errno.h>
  #include <linux/types.h>
  #include <linux/socket.h>
  #include <linux/in.h>
  #include <linux/kernel.h>
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  #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 <asm/uaccess.h>
  #include <asm/system.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;
  }