// 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:

// icmp6_hdr.h - ICMPv6 header structure

// This module defines the basic classes for accessing the header

// structures within ICMPv6 packets.

//

/**

 @file icmp6_hdr.h

 @ingroup ip_packet_formats

 @publishedAll

 @released

*/

#ifndef __ICMP6_HDR_H__

#define __ICMP6_HDR_H__

#include <e32def.h>

#include "in_hdr.h"

#include <in_sock.h> // IPv6 enhanced in_sock.h

/**

* @addtogroup ip_packet_formats

*/

//@{

// TInet6HeaderICMP

class TInet6HeaderICMP

/**

* ICMPv6 header common part layout.

*

* The basic ICMP header format only covers the common part (4 bytes)

* and 4 bytes of the Message Body (can be accesses as "Parameter")

@verbatim

Extract from RFC-2462: General format of ICMP message

 0                   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

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

|     Type      |     Code      |          Checksum             |

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

|                                                               |

+                         Message Body                          +

|                                                               |

@endverbatim

* @publishedAll

* @released

*/

	{

public:

	inline TInt HeaderLength() const

		/**

		* Gets the header length.	

		* 

		* @note

		*	This length is not the true length of the

		*	ICMP header. This only covers the fixed part.

		* 

		* @return	Header length.

		*/

		{return 4;}

	inline static TInt MinHeaderLength()

		/**

		* Gets the minimum header length.

		* 

		* @return	Minimum header length

		*/

		{return 4; }

	inline static TInt MaxHeaderLength()

		/**

		* Gets the maximum header length.

		* 

		* @note

		*	This length is not the true length of the

		*	ICMP header. This only covers the fixed part.

		* 

		* @return	Maximum header length

		*/

		{return 4; }

	inline TUint8 *EndPtr() const

		/**

		* Gets a pointer to the byte following the header.

		* 

		* @return

		*	Pointer to the byte following the minimum

		*	fixed header

		*/

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

	//

	// Access, get ICMP header field values from the packet

	//

	inline TUint8 Type() const

		/**

		* Gets the ICMPv6 type from the header.

		* @return ICMPv6 type [0..255]

		*/

		{

		return i[0];

		}

	inline TUint8 Code() const

		/**

		* Gets the ICMPv6 code from the header.

		* @return ICMPv6 code [0..255]

		*/

		{

		return i[1];

		}

	inline TInt Checksum() const

		/**

		* Gets the Checksum from the header.

		* @return Header Checksum (TUint16 in NETWORK byte order)

		*/

		{

		// Checksum is used in network byte order

		return *((TUint16 *)&i[2]);

		}

	inline TUint32 Parameter() const

		/**

		* Gets the ICMPv6 Parameter.

		*

		* Accesses the first 4 bytes of ICMP message body, and assumes

		* they form a 32 bit integer in network byte order. Returns

		* this integer in host order.

		*

		* @return ICMPv6 Parameter (as an integer)

		*/

		{

		return (i[4] << 24) | (i[5] << 16) | (i[6] << 8) | i[7];

		}

	//

	// Build, set IP header field values into the packet

	//

	inline void SetType(TUint8 aType)

		/**

		* Sets the ICMPv6 type.

		* @param aType ICMPv6 type [0..255]

		*/

		{

		i[0] = aType;

		}

	inline void SetCode(TUint8 aCode)

		/**

		* Sets the ICMPv6 code.

		* @param aCode ICMPv6 code [0..255]

		*/

		{

		i[1] = aCode;

		}

	inline void SetChecksum(TInt aSum)

		/**

		* Sets the Checksum.

		*

		* @param aSum

		*	The Checksum [0..65535] (16 least significant bits

		*	stored as is (assumed to be in NETWORK byte order).					

		*/

		{

		*((TUint16 *)&i[2]) = (TUint16)aSum;

		}

	inline void SetParameter(TUint32 aValue)

		/**

		* Sets the ICMPv6 Parameter.

		*

		* The value is converted into network byte order and

		* stored as the first 4 bytes of the ICMP message body.

		*

		* @param aValue

		*	The parameter.

		*/

		{

		i[7] = (TUint8)aValue;

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

		i[5] = (TUint8)(aValue >> 16);

		i[4] = (TUint8)(aValue >> 24);

		}

protected:

	union

		{

		TUint8 i[8];

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

		};

	};

//

// TInet6HeaderICMP_Echo

//

class TInet6HeaderICMP_Echo : public TInet6HeaderICMP

/**

* ICMPv6 Echo Request and Echo Reply layout.

*

* Describes the ICMP Echo Request and Replay layout. The space for

* Identifier and Sequence is already covered by the base class.

*

@verbatim

RFC-2463:

 0                   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

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

|     Type      |     Code      |          Checksum             |

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

|           Identifier          |        Sequence Number        |

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

|     Data ...

+-+-+-+-+-

@endverbatim

@publishedAll

@released

*/

	{

public:

	//

	// General

	//

	inline TInt HeaderLength() const

		/**

		* Gets the header length.

		* @return The length

		*/

		{return 8;}

	inline static TInt MinHeaderLength()

		/**

		* Gets the minimum header length.	

		* @return The length

		*/

		{return 8; }

	inline static TInt MaxHeaderLength()

		/**

		* Gets the maximum header length.	

		* @return The length

		*/

		{return 8; }

	//

	// Access, get ICMP header field values from the packet

	//

	inline TInt Identifier() const

		/**

		* Gets the Idenfifier

		* @return The Identifier

		*/

		{

		return (i[4] << 8) + i[5];

		}

	inline TInt Sequence() const

		/**

		* Gets the Sequence Number

		* @return The number

		*/

		{

		return (i[6] << 8) + i[7];

		}

	//

	// Build, set IP header field values into the packet

	//

	inline void SetIdentifier(TUint16 aIdentifier)

		/**

		* Sets the Idenfifier

		* @param aIdentifier The Identifier

		*/

		{

		i[4] = (TUint8)(aIdentifier >> 8);

		i[5] = (TUint8)aIdentifier;

		}

	inline void SetSequence(TUint16 aSequence)

		/**

		* Sets the Sequence Number

		* @param aSequence The number

		*/

		{

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

		i[7] = (TUint8)aSequence;

		}

private:

	};

class TInet6HeaderICMP_RouterSol: public TInet6HeaderICMP

/**

* ICMPv6 Router Solicitation layout.

*

@verbatim

Router Solicitation Message Format (from RFC-2461)

 0                   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

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

|     Type      |     Code      |          Checksum             |

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

|                            Reserved                           |

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

|   Options ...

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

@endverbatim

* Aside from the fields provided by the base class, there is nothing

* else here.

*

* Valid options:

*

* - #KInet6OptionICMP_SourceLink

*

* @publishedAll

* @released

*/

	{

public:

	inline static TInt MinHeaderLength() {return 8; }

	inline static TInt MaxHeaderLength() {return 8; }

	inline TInt HeaderLength() const {return 8;}

	};

// Router Advertisement Message Format from RFC-2461

class TInet6HeaderICMP_RouterAdv : public TInet6HeaderICMP

/**

* ICMPv6 Router Advertisement layout.

*

* (Neighbour Discovery for IP version 6)

* (+ Home Agent flag from draft-ietf-mobileip-ipv6-08)

@verbatim

Type=134, Code=0

 0                   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

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

|     Type      |     Code      |          Checksum             |

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

| Cur Hop Limit |M|O|H|Prf|Rsrvd|       Router Lifetime         |

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

|                         Reachable Time                        |

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

|                          Retrans Timer                        |

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

|   Options ...

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

@endverbatim

*

* @note

*	Above is longer thant what is declared in the base class

*	i-member. The user must verify the sufficient length of

*	the packet, when using this.

*

* Valid options:

*

* - #KInet6OptionICMP_SourceLink

* - #KInet6OptionICMP_Mtu

* - #KInet6OptionICMP_Prefix

* - #KInet6OptionICMP_RouteInformation (draft)

*

* @publishedAll

* @released

*/

	{

public:

	//

	// General

	//

	inline static TInt MinHeaderLength() {return 16; }

	inline static TInt MaxHeaderLength() {return 16; }

	inline TInt HeaderLength() const {return 16;}

	//

	// Access, get ICMP header field values from the packet

	//

	inline TInt CurHopLimit() const

		/**

		* Gets Cur Hop Limit.

		* @return Hop Limit

		*/

		{

		return i[4];

		}

	inline TInt Flags() const

		/**

		* Gets flags byte

		* @return Flags (M, O, H, Prf and Rsrvd)

		*/

		{

		return i[5];		// M + O + Reserved as one unit

		}

	inline TInt M() const

		/** Gets Managed Address Configuration (M) flag */

		{

		return i[5] & 0x80;

		}

	inline TInt O() const

		/** Gets Other Address Configuartion (O) flag */

		{

		return i[5] & 0x40;

		}

	inline TInt H() const

		/** Gets Home Agent Configuration (H) flag */

		{

		return i[5] & 0x20;

		}

#if 1

	inline TInt Prf() const

		/**

		* Gets default route preference.

		*

		* Experimental: draft-draves-ipngwg-router-selection-01.txt

		* Default Router Preferences and More-Specific Routes

		*/

		{

		return (i[5] >> 3) & 0x3;	// should be treated as 2bit signed int

		}

#endif

	inline TInt RouterLifetime() const

		/**

		* Gets the lifetime of the defaul route.

		*

		* If non-zero, specifies how long (in seconds) this

		* router is willing to act as a default router.

		*

		* @return The life time of the default route.

		*

		* @note

		*	This is badly named. The parameter controls

		*	only the default route processing. The value

		*	ZERO does not mean that the sender is not a

		*	router.

		*/

		{

		return (i[6] << 8) + i[7];

		}

	inline TUint32 ReachableTime() const

		/**

		* Gets the value of reachable timer.

		*/

		{

		return (i[8] << 24) | (i[9] << 16) | (i[10] << 8) | i[11];

		}

	inline TUint32 RetransTimer() const

		/**

		* Gets the value of retransmit timer.

		*/

		{

		return (i[12] << 24) | (i[13] << 16) | (i[14] << 8) | i[15];

		}

	//

	// Build, set IP header field values into the packet

	//

	inline void SetCurHopLimit(TInt aLimit)

		/**

		* Sets the Cur Hoplimit.

		* @param	aLimit	The Hoplimit [0..255]

		*/

		{

		i[4] = (TUint8)aLimit;

		}

	inline void SetFlags(TInt aFlags)

		/**

		* Sets the flags.

		* @param	aFlags	The flags bits [0..255].

		*/

		{

		i[5] = (TUint8)aFlags;

		}

	inline void SetRouterLifetime(TInt aTime)

		/**

		* Sets the lifetime of the default route.

		* @param aTime The lifetime.

		*/

		{

		i[7] = (TUint8)aTime;

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

		}

	inline void SetReachableTime(TUint32 aTime)

		/**

		* Sets the value of reachable timer

		* @param aTime The timer value

		*/

		{

		i[11] = (TUint8)aTime;

		i[10] = (TUint8)(aTime >> 8);

		i[9] = (TUint8)(aTime >> 16);

		i[8] = (TUint8)(aTime >> 24);

		}

	inline void SetRetransTimer(TUint32 aTimer)

		/**

		* Sets the value of the retransmit timer

		* @param aTimer The timer value

		*/

		{

		i[15] = (TUint8)aTimer;

		i[14] = (TUint8)(aTimer >> 8);

		i[13] = (TUint8)(aTimer >> 16);

		i[12] = (TUint8)(aTimer >> 24);

		}

private:

	};

class TInet6HeaderICMP_NeighborSol : public TInet6HeaderICMP

/**