flaneth

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/* flaneth - flash and ethernet - dartboard mod
 * version 0.1 date 2008-11-09
 * Copyright (C) 2007-2008 Stefan Schuermans <stefan@schuermans.info>
 * Copyleft: GNU public license V2 - http://www.gnu.org/copyleft/gpl.html
 * a BlinkenArea project - http://www.blinkenarea.org/
 */
#include "arp.h"
#include "config.h"
#include "debug.h"
#include "ethernet.h"
#include "ip.h"
#include "macros.h"
#include "nethelp.h"
// timing parameters
#define ArpTicksMax 150 // maximum age of ARP table entries (in 200ms steps)
#define ArpNoMacTicksMax 50 // maximum age of ARP table entries without MAC (in 200ms steps)
#define ArpRetryTicks 8 // time after which to retry ARP query (must be power of 2, in 200ms steps)
// ARP table
#define ArpTabFlagInUse 0x01
#define ArpTabFlagMacOk 0x02
struct ArpTable
{
  unsigned char Flags; // flags - see constants
  unsigned char Ticks; // age of entry in 200ms steps
  unsigned char Mac[6];
  unsigned char Ip[4];
} ArpTab[12];
// initialize
void ArpInit( void ) // (extern)
{
  unsigned char i;
  // empty ARP tabale
  for( i = 0; i < count( ArpTab ); i++ )
    ArpTab[i].Flags = 0;
}
// send an ARP request
static void ArpSendRequest( unsigned char * pIp )
{
  struct ArpPacket ArpRequest;
  debug_arp_printf( "send req ip=%u.%u.%u.%u",
                    pIp[0], pIp[1], pIp[2], pIp[3] );
  // build ARP request
  ArpRequest.ArpHdr.HwType = htons( 0x0001 ); // ethernet
 
 
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