bluebox

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/* BlueDataDistributor - data distribution module from ethernet to 32 serial ports
 * version 0.1.1 date 2006-10-07
 * Copyright (C) 2006 Stefan Schuermans <stefan@blinkenarea.org>
 * a BlinkenArea project - http://www.blinkenarea.org/
 */
#include "arp.h"
#include "config.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;
  // build ARP request
  ArpRequest.ArpHdr.HwType = htons( 0x0001 ); // ethernet
  ArpRequest.ArpHdr.ProtoType = htons( 0x0800 ); // IP
  ArpRequest.ArpHdr.HwLen = 0x06; // length of a MAC address
  ArpRequest.ArpHdr.ProtoLen = 0x04; // length of an IP address
  ArpRequest.ArpHdr.Op = htons( 0x0001 ); // ARP request
  mac_cpy( ArpRequest.ArpHdr.SrcMac, ConfigMac ); // own MAC
 
 
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