flaneth

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/* flaneth - flash and ethernet
   Copyright (C) 2007-2012 Stefan Schuermans <stefan@blinkenarea.org>
   Copyleft: GNU public license V2 - http://www.gnu.org/copyleft/gpl.html
   a BlinkenArea project - http://www.blinkenarea.org/ */
#include "config.h"
#include "checksum.h"
#include "debug.h"
#include "dhcp.h"
#include "ethernet.h"
#include "ip.h"
#include "macros.h"
#include "mcuf_in.h"
#include "nethelp.h"
#include "ser62500.h"
#include "udp.h"
// some kind of "token bucket" for UDP echo
#define UdpEchoTicks 10 // allowed rate of UDP echo replies (in 200ms steps)
unsigned char UdpEchoTickCnt = 0;       // tick counter
#define UdpEchoReliesMax 3      // maximum value for UdpEchoReplies
unsigned char UdpEchoReplies = 0;       // number of UDP echo replies that
                                        // may be sent at the moment
// tick procedure - call every 200ms
void UdpTick200(void)   // (extern)
{
  // count ticks
  UdpEchoTickCnt++;
  // time to allow one reply more
  if (UdpEchoTickCnt >= UdpEchoTicks) {
    UdpEchoTickCnt = 0;
    // increase reply count if not at maximum
    if (UdpEchoReplies < UdpEchoReliesMax)
      UdpEchoReplies++;
  }
}
// process a received UDP echo packet
static void UdpEchoRecv(unsigned char *pData, unsigned short Length)
{
  struct UdpPacket *pUdpPack;
  // convert pointer to UDP packet
  // (this saves us from always casting pData)
  pUdpPack = (struct UdpPacket *)pData;
  // source port is UDP echo port
  if (pUdpPack->UdpHdr.SrcPort == htons(7))
    // ignore this packet
 
 
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