BlueDataDistributor/firmware/ethernet.c (fd252ce) - bluebox · BlinkenArea

ethernet.c

/* 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"
#include "rtl8019.h"

// process a received ethernet packet
void EthernetRecv( unsigned char * pData, unsigned short Length ) // (extern)
{
  struct EthernetPacket * pEthPack;

// packet too short
  if( Length < sizeof( struct EthernetPacket ) )
    return;

// convert pointer to ethernet packet
  // (this saves us from always casting pData)
  pEthPack = (struct EthernetPacket *)pData;

// branch according to packet type
  switch( pEthPack->EthHdr.Type )
  {
    // ARP
    case htons( 0x0806 ):
      ArpRecv( pData, Length );
      break;
    // IP
    case htons( 0x0800 ):
      IpRecv( pData, Length );
      break;
  }
}

// send an ethernet packet
// pData must point to a struct EthernetPacket with EthHdr.Dest and EthHdr.Type already initialized
void EthernetSend( unsigned char * pData, unsigned short Length ) // (extern)
{
  struct EthernetPacket * pEthPack;

// packet too short
  if( Length < sizeof( struct EthernetPacket ) )
    return;

// convert pointer to ethernet packet
  // (this saves us from always casting pData)
  pEthPack = (struct EthernetPacket *)pData;

// fill in source address
  mac_cpy( pEthPack->EthHdr.Src, ConfigMac );

// send packet
  RtlWriteFrame( pData, Length );
}

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