/*

* Copyright (c) 2003 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: IKE message header class

*

*/

#ifndef _IKE_MSG_HEADER_H_

#define _IKE_MSG_HEADER_H_

#include <e32base.h>

#define ISAKMP_COOKIE_SIZE 8

#define IKEV2_SPI_SIZE     8

typedef TBuf8<ISAKMP_COOKIE_SIZE> TCookie;

typedef TBuf8<IKEV2_SPI_SIZE> TIkeSPI;

#define ISAKMP_HDR_SIZE sizeof(ThdrISAKMP)

#define IKEV2_HDR_SIZE  sizeof(ThdrISAKMP)

#define IKE_PORT                  500

#define FLOATED_IKE_PORT          4500     

#define NON_ESP_MARKER            0x0     

#define NON_ESP_MARKER_SIZE       4   // Corresponds IPSEC SPI size

//

//  NAT flags

//

#define LOCAL_END_NAT       0x1

#define REMOTE_END_NAT      0x2

#define MOBIKE_USED         0x4

//

// These macro definitions takes care of 16- and 32-bit data packing and

// unpacking.

// The following assumptions are in use for macros:

// -- The connection memory is a little-endian configured (= Intel format)

// -- A macro does always an unconditional conversion for the parameter data

//    PUTxx(d, s) = Source data is supposed to be in "Network order". Data

//                  is stored to *p as little-endian.

//    GETxx(s)    = Source data is supposed to be in memory as little-endian.

//                  Macro return data in "Network order"

//

#define PUT16(d, s)  \

   (*(unsigned char*)((unsigned char*)(d)+1)) = (unsigned char)((s) & 0xff);\

   (*(unsigned char*)(d))                     = (unsigned char)(((s) >> 8 ) & 0xff)

#define PUT32(d, s)  \

    (*(unsigned char*)((unsigned char*)(d)+3)) = (unsigned char)((s) & 0xff);\

    (*(unsigned char*)((unsigned char*)(d)+2)) = (unsigned char)(((s) >> 8 ) & 0xff);\

    (*(unsigned char*)((unsigned char*)(d)+1)) = (unsigned char)(((s) >> 16) & 0xff);\

    (*(unsigned char*)(d))                     = (unsigned char)(((s) >> 24) & 0xff)

#define GET16(s)  \

     (((unsigned short)(*((unsigned char*)(s)+1)))     | \

      ((unsigned short)(*(unsigned char*)(s)) << 8 ))

#define GET32(s)  \

     (((unsigned int)(*((unsigned char*)(s)+3)))         | \

     (((unsigned int)(*((unsigned char*)(s)+2))) << 8  ) | \

     (((unsigned int)(*((unsigned char*)(s)+1))) << 16 ) | \

      ((unsigned int)(*(unsigned char*)(s)) << 24 ))

//

//   IKEv2 MESSAGE FIXED HEADER

//                       1                   2                   3

//   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

//   !                       IKE_SA Initiator's SPI                  !

//   !                                                               !

//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

//   !                       IKE_SA Responder's SPI                  !

//   !                                                               !

//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

//   !  Next Payload ! MjVer ! MnVer ! Exchange Type !     Flags     !

//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

//   !                          Message ID                           !

//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

//   !                            Length                             !

//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

//

//   IKEv1 MESSAGE FIXED HEADER

//

//                     1                   2                   3

//   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

//   !                          Initiator                            !

//   !                            Cookie                             !

//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

//   !                          Responder                            !

//   !                            Cookie                             !

//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

//   !  Next Payload ! MjVer ! MnVer ! Exchange Type !     Flags     !

//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

//   !                          Message ID                           !

//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

//   !                            Length                             !

//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

//

class ThdrISAKMP

{

public:

    static inline const ThdrISAKMP* Ptr(const TDes8& aMsg, TInt aOffset) { return (ThdrISAKMP*)(aMsg.Ptr() + aOffset); }

    static inline const ThdrISAKMP* Ptr(const TDes8& aMsg) { return (ThdrISAKMP*)aMsg.Ptr(); }

	static inline TInt Size() { return sizeof(ThdrISAKMP); }	

    inline const ThdrISAKMP* GotoOffset(TUint8 aOffset) const { return (const ThdrISAKMP*)((char*)this + aOffset); }

    inline TUint8* Next() const { return (TUint8*)((char*)this + sizeof(ThdrISAKMP)); }

	inline TCookie GetCookieI() const

		{ TCookie c;

          c.Copy(&u.iData8[0],ISAKMP_COOKIE_SIZE);

	      return c;

		}

	inline void GetSPI_I(TIkeSPI& aSPI) const { aSPI.Copy(&u.iData8[0], IKEV2_SPI_SIZE); }

	inline TUint32 GetSPI_I_Low32() const  { return GET32(&u.iData32[1]); }

	inline TUint32 GetNegotiationID_I() const  { return GET32(&u.iData32[0]); }

	inline TCookie GetCookieR() const

		{ TCookie c;

	      c.Copy(&u.iData8[8],ISAKMP_COOKIE_SIZE);

	      return c;

		}

	inline void GetSPI_R(TIkeSPI& aSPI) const { aSPI.Copy(&u.iData8[8], IKEV2_SPI_SIZE); }

	inline TUint32 GetSPI_R_Low32() const  { return GET32(&u.iData32[3]); }	

	inline TUint32 GetNegotiationID_R() const  { return GET32(&u.iData32[2]); }

	inline void SetCookieI(const TCookie& aCookie)

		{ Mem::Copy(&u.iData8[0], aCookie.Ptr(), ISAKMP_COOKIE_SIZE); }

	inline void SetSPI_I(const TIkeSPI& aSPI)	{Mem::Copy(&u.iData8[0],aSPI.Ptr(),IKEV2_SPI_SIZE); }

	inline void SetCookieR(const TCookie& aCookie)

		{ Mem::Copy(&u.iData8[8],aCookie.Ptr(),ISAKMP_COOKIE_SIZE); }

	inline void SetSPI_R(const TIkeSPI& aSPI)	{ Mem::Copy(&u.iData8[8],aSPI.Ptr(),IKEV2_SPI_SIZE); }

	inline TUint8 GetPayload() const { return u.iData8[16]; }

	inline void SetPayload(TUint8 aPayload) { u.iData8[16] = aPayload; }

	inline TUint8 GetVersion() const { return u.iData8[17]; }

	inline TUint8 GetMajorVersion() const { return (TUint8)(u.iData8[17] >> 4); }

	inline TUint8 GetMinorVersion() const { return (TUint8)(u.iData8[17] & 0xf); }		

	inline void SetVersion(TUint8 aVersion) { u.iData8[17] = aVersion; }

	inline TUint8 GetExchange() const { return u.iData8[18]; }

	inline void SetExchange(TUint8 aType) { u.iData8[18] = aType; }

	inline TUint8 GetFlags() const { return u.iData8[19]; }

	inline void SetFlags(TUint8 aFlags) { u.iData8[19] = aFlags; }

	inline TUint32 GetMessageId() const { return GET32(&u.iData32[5]); }

	inline void SetMessageId(TUint32 aId) { PUT32(&u.iData32[5], aId); }

	inline TUint32 GetLength() const { return GET32(&u.iData32[6]); }

	inline void SetLength(TUint32 aLength) { PUT32(&u.iData32[6], aLength); }

private:

    union

        {

        TUint32 iData32[7];

        TUint16 iData16[14];

        TUint8  iData8[28];

        } u;

};

#endif