// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// which accompanies this distribution, and is available

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// arp_hdr.h - ARP header structure

// ARP header structure.

//

/**

 @file arp_hdr.h

 @ingroup ip_packet_formats

 @publishedAll

 @released

*/

#ifndef __ARP_HDR_H__

#define __ARP_HDR_H__

#include "in_hdr.h"

/**

* @addtogroup  ip_packet_formats

* @{

*/

/**

* "Fake" protocol number for ARP.

*

* This protocol value is only used to recognize the ARP packets

* coming from the interface. There is no "real" ARP.PRT.

*/

const TUint KProtocolArp		= 0xFAD;	// (get some better value)

const TUint16 KArpProtocolType_IP = 0x0800;	// Protocol Type value for IPv4

//

// Hardware types listed only as example, it is assumed that the

// driver knows its own type...

//

const TUint16 KArpHarwareType_ETHERNET = 1;

const TUint16 KArpHarwareType_IEEE_802 = 6;

/**

@publishedAll

@released

*/

enum TArpOperation	// from RFC-1700

	{

	EArpOperation_REQUEST = 1,			// RFC-826

	EArpOperation_REPLY = 2,			// RFC-826

	EArpOperation_REQUEST_REVERSE = 3,	// RFC-903

	EArpOperation_REPLY_REVERSE = 4,	// RFC-903

	EArpOperation_DRARP_REQUEST = 5,	//

	EArpOperation_DRARP_REPLY = 6,

	EArpOperation_DRARP_ERROR = 7,

	EArpOperation_INARP_REQUEST = 8,	// RFC-1293

	EArpOperation_INARP_REPLY = 9,		// RFC-1293

	EArpOperation_ARP_NAK = 10

	};

class TInet6HeaderArp

	/**

	* ARP Header.

	*

@verbatim

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |        Hardware Type          |         Protocol Type         |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |  HwAddrLen    |   PrAddrLen   |         ARP Operation         |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |         Sender's physical hardware address                    |

   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

 |         Sender's protocol address                             |

   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

 |         Target's physical hardware address                    |

   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

 |         Target's protocol address                             |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

@endverbatim

	* @note

	* This definition covers only the fixed portion of the

	* message. DO NOT DECLARE A VARIABLE WITH THIS CLASS!

	* @publishedAll

	* @released

	*/

	{

public:

	inline static TInt MinHeaderLength() {return 8; }

	inline static TInt MaxHeaderLength() {return 128; }	

	inline TUint8* EndPtr() { return i + HeaderLength(); }

	inline TInt HeaderLength() const { return 8 + 2 * HwAddrLen() + 2 * PrAddrLen(); } // Return true byte length

	// Access methods

	inline TInt HardwareType() const	// Return hardware type value in host order

		{

		return i[0] << 8 | i[1];

		}

	inline TInt ProtocolType() const	// Return protocol type value in host order

		{

		return i[2] << 8 | i[3];

		}

	inline TInt HwAddrLen()	const		// Return hardware address length (in bytes)

		{

		return i[4];

		}

	inline TInt PrAddrLen()	const		// Return protocol address length (in bytes)

		{

		return i[5];

		}

	inline TInt Operation() const

		{

		return i[6] << 8 | i[7];

		}

	// Access/Modify

	inline TPtr8 SenderHwAddr()

		{

		return TPtr8(&i[8], HwAddrLen(), HwAddrLen());

		}

	inline TPtr8 SenderPrAddr()

		{

		return TPtr8(&i[8] + HwAddrLen(), PrAddrLen(), PrAddrLen());

		}

	inline TPtr8 TargetHwAddr()

		{

		return TPtr8(&i[8] + HwAddrLen() + PrAddrLen(), HwAddrLen(), HwAddrLen());

		}

	inline TPtr8 TargetPrAddr()

		{

		return TPtr8(&i[8] + 2*HwAddrLen() + PrAddrLen(), PrAddrLen(), PrAddrLen());

		}

	// Modify

	inline void SetHardwareType(TInt aType)	// Set hardware type value

		{

		i[1] = (TUint8)aType;

		i[0] = (TUint8)(aType >> 8);

		}

	inline void SetProtocolType(TInt aType)	// Set protocol type value

		{

		i[3] = (TUint8)aType;

		i[2] = (TUint8)(aType >> 8);

		}

	inline void SetHwAddrLen(TInt aLength)	// Set hardware address length (in bytes)

		{

		i[4] = (TUint8)aLength;

		}

	inline void SetPrAddrLen(TInt aLength)	// Set protocol address length (in bytes)

		{

		i[5] = (TUint8)aLength;

		}

	inline void SetOperation(TInt aOperation)

		{

		i[7] = (TUint8)aOperation;

		i[6] = (TUint8)(aOperation >> 8);

		}

private:

	union

		{

		TUint8 i[8];

		TUint32 iAlign;	// A dummy member to force the 4 byte alignment

		};

	};

/** @} */

#endif