firmware/arp.h (2342395) - flaneth · BlinkenArea

arp.h

/* 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/ */

#ifndef INC_arp
#define INC_arp

#include "ethernet.h"

// header of an ARP packet
struct ArpHeader {
  unsigned short HwType;
  unsigned short ProtoType;
  unsigned char HwLen;
  unsigned char ProtoLen;
  unsigned short Op;
  unsigned char SrcMac[6];
  unsigned char SrcIp[4];
  unsigned char DestMac[6];
  unsigned char DestIp[4];
};

// an ARP packet
struct ArpPacket {
  struct EthernetHeader EthHdr;
  struct ArpHeader ArpHdr;
};

// initialize
extern void ArpInit(void);

// tick procedure - call every 200ms
extern void ArpTick200(void);

// process a received ARP packet
extern void ArpRecv(unsigned char *pData, unsigned short Length);

// lookup the MAC for an IP address
// returns 0x00 in case of success, 0x01 if the MAC address is unknown
extern unsigned char ArpLookup(unsigned char *pIp, unsigned char *pMac);

#endif // #ifdef INC_arp

flaneth

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