williamr@2: // Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).
williamr@2: // All rights reserved.
williamr@2: // This component and the accompanying materials are made available
williamr@4: // under the terms of "Eclipse Public License v1.0"
williamr@2: // which accompanies this distribution, and is available
williamr@4: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
williamr@2: //
williamr@2: // Initial Contributors:
williamr@2: // Nokia Corporation - initial contribution.
williamr@2: //
williamr@2: // Contributors:
williamr@2: //
williamr@2: // Description:
williamr@2: // ip4_hdr.h - IPv4 header structure
williamr@2: // Defines the basic classes for accessing the header
williamr@2: // structures within IPv4 packets.
williamr@2: //
williamr@2: 
williamr@2: 
williamr@2: 
williamr@2: /**
williamr@2:  @file ip4_hdr.h
williamr@2:  @ingroup ip_packet_formats
williamr@2:  @publishedAll
williamr@2:  @released
williamr@2: */
williamr@2: 
williamr@2: #ifndef __IP4_HDR_H__
williamr@2: #define __IP4_HDR_H__
williamr@2: 
williamr@2: #include "in_hdr.h"
williamr@2: #include "es_sock.h"		// for ByteOrder only!!!
williamr@2: 
williamr@2: /**
williamr@2: * @addtogroup ip_packet_formats
williamr@2: * @{
williamr@2: */
williamr@2: 
williamr@2: /**
williamr@2: * @name IP v4 constants 
williamr@2: * @since v7.0
williamr@2: * @publishedAll
williamr@2: * @released
williamr@2: */
williamr@4: //@{
williamr@4: const TUint8 KInet4IP_DF = 0x40;	//< Don't Fragment flag
williamr@4: const TUint8 KInet4IP_MF = 0x20;	//< More Fragments flag
williamr@4: const TInt KInetMinMtu = 68;		//< Minimum MTU as defined in RFC-791 
williamr@4: //@}
williamr@2: 
williamr@2: class TInet6HeaderIP4
williamr@2: /**
williamr@2: *	Encapsulates an IPv4 IP header. 
williamr@2: * 
williamr@2: @verbatim
williamr@2:   ************************
williamr@2:   Extract from the RFC-791
williamr@2:   ************************
williamr@2:   0                   1                   2                   3
williamr@2:   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
williamr@2:   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
williamr@2:   |Version|  IHL  |Type of Service|          Total Length         |
williamr@2:   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
williamr@2:   |         Identification        |Flags|      Fragment Offset    |
williamr@2:   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
williamr@2:   |  Time to Live |    Protocol   |         Header Checksum       |
williamr@2:   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
williamr@2:   |                       Source Address                          |
williamr@2:   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
williamr@2:   |                    Destination Address                        |
williamr@2:   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
williamr@2:   |                    Options                    |    Padding    |
williamr@2:   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
williamr@2:   
williamr@2:   Version:  4 bits = 4
williamr@2:   IHL:  4 bits
williamr@2: 
williamr@2:     Internet Header Length is the length of the internet header in 32
williamr@2:     bit words, and thus points to the beginning of the data.  Note that
williamr@2:     the minimum value for a correct header is 5
williamr@2: 
williamr@2:   Type of Service:  8 bits
williamr@2:       Bits 0-2:  Precedence.
williamr@2:       Bit    3:  0 = Normal Delay,      1 = Low Delay.
williamr@2:       Bits   4:  0 = Normal Throughput, 1 = High Throughput.
williamr@2:       Bits   5:  0 = Normal Relibility, 1 = High Relibility.
williamr@2:       Bit  6-7:  Reserved for Future Use.
williamr@2: 
williamr@2: 	  Precedence
williamr@2: 
williamr@2:           111 - Network Control
williamr@2:           110 - Internetwork Control
williamr@2:           101 - CRITIC/ECP
williamr@2:           100 - Flash Override
williamr@2:           011 - Flash
williamr@2:           010 - Immediate
williamr@2:           001 - Priority
williamr@2:           000 - Routine
williamr@2:   Total Length:  16 bits
williamr@2:     Total Length is the length of the datagram, measured in octets,
williamr@2:     including internet header and data.
williamr@2: 
williamr@2:   Identification:  16 bits
williamr@2:     An identifying value assigned by the sender to aid in assembling the
williamr@2:     fragments of a datagram.
williamr@2: 
williamr@2:   Flags:  3 bits
williamr@2:     Various Control Flags.
williamr@2: 
williamr@2:       Bit 0: reserved, must be zero
williamr@2:       Bit 1: (DF) 0 = May Fragment,  1 = Don't Fragment.
williamr@2:       Bit 2: (MF) 0 = Last Fragment, 1 = More Fragments.
williamr@2: 
williamr@2:   Fragment Offset:  13 bits
williamr@2: 
williamr@2:     This field indicates where in the datagram this fragment belongs.
williamr@2:     The fragment offset is measured in units of 8 octets (64 bits).  The
williamr@2:     first fragment has offset zero.
williamr@2: 
williamr@2:   Time to Live:  8 bits
williamr@2:   Protocol:  8 bits
williamr@2:   Header Checksum:  16 bits
williamr@2:   Source Address:  32 bits
williamr@2:   Destination Address:  32 bits
williamr@2: @endverbatim
williamr@2: 
williamr@2: @publishedAll
williamr@2: @released
williamr@2: @since v7.0
williamr@2: */
williamr@2: 	{
williamr@2: public:
williamr@2: 	//
williamr@2: 	// Basic
williamr@2: 	//
williamr@2: 	/**
williamr@2: 	* Gets the minimum header length.	
williamr@2: 	* @return Minimum header length (= 20) 
williamr@2: 	* @since v7.0
williamr@2: 	*/
williamr@2: 	inline static TInt MinHeaderLength() {return 4*5; }
williamr@2: 	/**
williamr@2: 	* Gets the maximum header length.
williamr@2: 	* @return Maximum header length (= 60)
williamr@2: 	* @since v7.0
williamr@2: 	*/
williamr@2: 	inline static TInt MaxHeaderLength() {return 4*15; }
williamr@2: 	/**
williamr@2: 	* Gets a pointer to the byte following the header.
williamr@2: 	* @return Pointer to the byte following the header
williamr@2: 	* @since v7.0
williamr@2: 	*/
williamr@2: 	inline TUint8 *EndPtr() {return i + HeaderLength();}
williamr@2: 
williamr@2: 	enum TOffsets
williamr@2: 		{
williamr@2: 		O_TotalLength = 2,
williamr@2: 		O_FragmentOffset = 6,
williamr@2: 		O_TTL = 8,
williamr@2: 		O_Protocol = 9
williamr@2: 		};
williamr@2: 	inline TInt Version() const
williamr@2: 		/**
williamr@2: 		* Gets the IP version from the header.
williamr@2: 		* @return IP version (should be 4 for IPv4)
williamr@2: 		*/ 
williamr@2: 		{
williamr@2: 		return (i[0] >> 4) & 0xf;
williamr@2: 		}
williamr@2: 	inline TInt HeaderLength() const
williamr@2: 		/**
williamr@2: 		* Gets the header length.
williamr@2: 		* @return Header length in bytes (based on IHL field)
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return (i[0] & 0x0f) * 4;	// Note: Returns bytes length!
williamr@2: 		}
williamr@2: 	inline TInt TOS() const
williamr@2: 		/**
williamr@2: 		* Gets the TOS from the header.
williamr@2: 		* @return TOS
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return i[1];
williamr@2: 		}
williamr@2: 	inline TBool EcnIsCongestion()
williamr@2: 		/**
williamr@2: 		* Gets ECN congestion status.
williamr@2: 		*
williamr@2: 		* see RFC-3168 for details.
williamr@2: 		*
williamr@2: 		* @return	True, if CE bit is set on an ECN capable packet.
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return ((TOS() & 3) == 3);
williamr@2: 		}
williamr@2: 	inline TInt TotalLength() const
williamr@2: 		/**
williamr@2: 		* Gets the Total Length from the header.
williamr@2: 		* @return Total Length (includes IP header and payload)
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return (i[2] << 8) | i[3];
williamr@2: 		}
williamr@2: 	inline TInt Identification() const
williamr@2: 		/**
williamr@2: 		* Gets the Identification from the header.
williamr@2: 		* @return Identification [0..65535]
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return (i[4] << 8) | i[5];
williamr@2: 		}
williamr@2: 	inline TInt Flags() const
williamr@2: 		/**
williamr@2: 		* Gets the Flags from the header.
williamr@2: 		* @note returns flags byte as is, may include bits of fragment offset!
williamr@2: 		* @return Flags
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return i[6];
williamr@2: 		}
williamr@2: 	inline TInt DF() const
williamr@2: 		/**
williamr@2: 		* Gets the DF flag from the header.
williamr@2: 		* @return DF flag (= KInet4IP_DF, if set and zero otherwise)
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return i[6] & KInet4IP_DF;
williamr@2: 		}
williamr@2: 	inline TInt MF() const
williamr@2: 		/**
williamr@2: 		* Gets the MF flag from the header.
williamr@2: 		* @return MF flag (= KInet4IP_MF, if set and zero otherwise)
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return i[6] & KInet4IP_MF;
williamr@2: 		}
williamr@2: 	inline TInt FragmentOffset() const
williamr@2: 		/**
williamr@2: 		* Gets the Fragment Offset from the header.
williamr@2: 		* @return Fragment Offset (raw 8 octet units, not a bytes offset!)
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return ((i[6] & 0x1f) << 8) | i[7];
williamr@2: 		}
williamr@2: 	inline TInt Ttl() const
williamr@2: 		/**
williamr@2: 		* Gets the Time to Live from the header.
williamr@2: 		* @return Time to Live [0..255]
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return i[8];
williamr@2: 		}
williamr@2: 	inline TInt Protocol() const
williamr@2: 		/**
williamr@2: 		* Gets the Protocol from the header.
williamr@2: 		* @return Protocol [0..255]
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return i[9];
williamr@2: 		}
williamr@2: 	inline TInt Checksum() const
williamr@2: 		/**
williamr@2: 		* Gets the Header Checksum from the header.
williamr@2: 		* @return Header Checksum (in NETWORK byte order)
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		// Checksum is used in network byte order
williamr@2: 		return *((TUint16 *)&i[10]);
williamr@2: 		}
williamr@2: 	inline TUint32 SrcAddr() const
williamr@2: 		/**
williamr@2: 		* Gets the source address from the header.
williamr@2: 		* @return Source address (in host byte order)
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return (i[12] << 24) | (i[13] << 16) | (i[14] << 8) | i[15];
williamr@2: 		}
williamr@2: 	inline TUint32 DstAddr() const
williamr@2: 		/**
williamr@2: 		* Gets the destination address from the header.
williamr@2: 		* @return Destination address (in host byte order)
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return (i[16] << 24) | (i[17] << 16) | (i[18] << 8) | i[19];
williamr@2: 		}
williamr@2: 	inline TUint32 &SrcAddrRef() const
williamr@2: 		/**
williamr@2: 		* Gets a raw reference to the source address in network byte order.
williamr@2: 		* @return Raw reference to the source address
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return (TUint32 &)i[12];
williamr@2: 		}
williamr@2: 	inline TUint32 &DstAddrRef() const
williamr@2: 		/**
williamr@2: 		* Gets a raw reference to the destination address in network byte order.
williamr@2: 		* @return Raw reference to the destination address
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return (TUint32 &)i[16];
williamr@2: 		}
williamr@2: 	inline TPtrC8 Options() const
williamr@2: 		/**
williamr@2: 		* Gets the Options from the header (const overload).
williamr@2: 		* @return Options
williamr@2: 		*
williamr@2: 		* @note
williamr@2: 		*	This relies on correct value of IHL! Must not be used with
williamr@2: 		*	corrupt headers (will panic if IHL < 5!).
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		// *NOTE* This includes the padding bytes, or can be empty!
williamr@2: 		return TPtrC8((TUint8 *)&i[20], HeaderLength() - 20);
williamr@2: 		}
williamr@2: 	inline TPtr8 Options()
williamr@2: 		/**
williamr@2: 		* Gets the Options from the header.
williamr@2: 		* @return Options
williamr@2: 		*
williamr@2: 		* @note
williamr@2: 		*	This relies on correct value of IHL! Must not be used with
williamr@2: 		*	corrupt headers (will panic if IHL < 5!).
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		// It is yet unclear what will be the best way to build
williamr@2: 		// the options into the header. For the time being this
williamr@2: 		// method returns a modifiable Ptr8 to the the available
williamr@2: 		// option space. For this to work, the application must
williamr@2: 		// have used the SetHeaderLength() to fix the current
williamr@2: 		// available length.
williamr@2: 		return TPtr8((TUint8 *)&i[20], HeaderLength() - 20);
williamr@2: 		}
williamr@2: 
williamr@2: 	inline void Init(TInt aTOS = 0)
williamr@2: 		/**
williamr@2: 		* Initialises the IPv4 header to basic initial values.
williamr@2: 		*
williamr@2: 		* @li	Version = 4
williamr@2: 		* @li	IHL = 5
williamr@2: 		* @li	Total Length = 20
williamr@2: 		* @li	Identification = 0
williamr@2: 		* @li	Fragment Offset = 0
williamr@2: 		* @li	Flags = 0
williamr@2: 		* @li	TTL = 0
williamr@2: 		* @li	Checksum = 0
williamr@2: 		* @li	TOS = aTOS (optional parameter, default = 0)
williamr@2: 		*
williamr@2: 		* However, address fields are not touched, because
williamr@2: 		* they are most often set separately in any case.
williamr@2: 		*
williamr@2: 		* @param	aTOS	initial value for TOS (= 0)
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		i[0] = 0x45;			// Version=4, IHL=5 (= 20 bytes)
williamr@2: 		i[1] = (TUint8)aTOS;	// TOS
williamr@2: 		i[2] = 0;
williamr@2: 		i[3] = 20;				// Total length = 20
williamr@2: 		*((TInt32 *)&i[4]) = 0;	// Identification = 0, flags=0, Fragment offset = 0;
williamr@2: 		*((TInt32 *)&i[8]) = 0;	// TTL=0,Protocol=0,Checksum=0
williamr@2: 		}
williamr@2: 	//
williamr@2: 	// Build, set IP header field values into the packet
williamr@2: 	//
williamr@2: 
williamr@2: 	inline void SetVersion(TInt aVersion)
williamr@2: 		/**
williamr@2: 		* Sets the IP version in the header.
williamr@2: 		* @param	aVersion the value to be set [0..15]
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		i[0] = (TUint8)((i[0] & 0x0f) | ((aVersion << 4) & 0xf0));
williamr@2: 		}
williamr@2: 	inline void SetHeaderLength(TInt aLength)
williamr@2: 		/**
williamr@2: 		* Sets the header length (IHL).
williamr@2: 		*
williamr@2: 		* @param aLength
williamr@2: 		*	the length of the IPv4 header in BYTES. The
williamr@2: 		*	IHL is computed from this, without any sanity
williamr@2: 		*	checks. The valid range is [20..60].
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		i[0] =  (TUint8)((i[0] & 0xf0) | ((aLength >> 2) & 0x0f));
williamr@2: 		}
williamr@2: 	inline void SetTOS(TInt aTos)
williamr@2: 		/**
williamr@2: 		* Sets the TOS in the header.
williamr@2: 		* @param	aTos	The TOS value to set [0..255]
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		i[1] = (TUint8)aTos;
williamr@2: 		}
williamr@2: 	inline void SetTotalLength(TInt aLength)
williamr@2: 		/**
williamr@2: 		* Sets the Total Length in the header.
williamr@2: 		*
williamr@2: 		* @param	aLength the length of combined header and
williamr@2: 		*			payload in bytes (no sanity checks, but the
williamr@2: 		*			value should be in range [20..65535]). Only
williamr@2: 		*			16 least significant bits used.
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		i[3] = (TUint8)aLength;
williamr@2: 		i[2] = (TUint8)(aLength >> 8);
williamr@2: 		}
williamr@2: 	inline void SetIdentification(TInt aId)
williamr@2: 		/**
williamr@2: 		* Sets the Identification in the header.
williamr@2: 		*
williamr@2: 		* @param	aId	the value to be set (only 16 least significant
williamr@2: 		*			bits are used, rest is ignored).
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		i[5] = (TUint8)aId;
williamr@2: 		i[4] = (TUint8)(aId >> 8);
williamr@2: 		}
williamr@2: 
williamr@2: 	inline void SetFlags(TUint8 aFlags)
williamr@2: 		/**
williamr@2: 		* Sets the Flags in the header.
williamr@2: 		*
williamr@2: 		* Flags are assumed to be in the three most significant bits
williamr@2: 		* of aFlags, in their proper positions.
williamr@2: 		* (No individual settings provided, if you need to set a flag
williamr@2: 		* without affecting others, use Flags() to get old values,
williamr@2: 		* update and store the result with SetFlags()).
williamr@2: 		*
williamr@2: 		* @param	aFlags	contains the new flags
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		i[6] = (TUint8)((i[6] & 0x1f) | (aFlags & 0xe0));
williamr@2: 		}
williamr@2: 	inline void SetFragmentOffset(TUint16 aOffset)
williamr@2: 		/**
williamr@2: 		* Sets the Fragment Offset in the header.
williamr@2: 		* @param aOffset Fragment Offset (8 octet units, not in bytes)
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		i[6] = (TUint8)((i[6] & 0xe0) | ((aOffset >> 8) & 0x1f));
williamr@2: 		i[7] = (TUint8)aOffset;
williamr@2: 		}
williamr@2: 	inline void SetTtl(TInt aTTL)
williamr@2: 		/**
williamr@2: 		* Sets the Time to Live in the header.
williamr@2: 		* @param aTTL Time to Live [0..255]
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		i[8] = (TUint8)aTTL;
williamr@2: 		}
williamr@2: 	inline void SetProtocol(TInt aProtocol)
williamr@2: 		/**
williamr@2: 		* Sets the Protocol in the header.
williamr@2: 		* @param aProtocol Protocol [0..255]
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		i[9] = (TUint8)aProtocol;
williamr@2: 		}
williamr@2: 	inline void SetChecksum(TInt aSum)
williamr@2: 		/**
williamr@2: 		* Sets the Header Checksum in the header.
williamr@2: 		* @param aSum Header Checksum [0..65535]
williamr@2: 		*	(16 least significant bits stored
williamr@2: 		*	as is (assumed to be in NETWORK byte order).					
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		// Checksum is used in network byte order
williamr@2: 		*((TUint16 *)&i[10]) = (TUint16)aSum;
williamr@2: 		}
williamr@2: 
williamr@2: 	inline void SetSrcAddr(TUint32 aAddr)
williamr@2: 		/**
williamr@2: 		* Sets the source address in the header.
williamr@2: 		* @param aAddr Source address (IPv4, 32 bit integer in host byte order)
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		i[15] = (TUint8)aAddr;
williamr@2: 		i[14] = (TUint8)(aAddr >> 8);
williamr@2: 		i[13] = (TUint8)(aAddr >> 16);
williamr@2: 		i[12] = (TUint8)(aAddr >> 24);
williamr@2: 		}
williamr@2: 
williamr@2: 	inline void SetDstAddr(TUint32 aAddr)
williamr@2: 		/**
williamr@2: 		* Sets the destination address in the header.
williamr@2: 		* @param aAddr Destination IPv4 address (32 bit integer) in host byte order
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		i[19] = (TUint8)aAddr;
williamr@2: 		i[18] = (TUint8)(aAddr >> 8);
williamr@2: 		i[17] = (TUint8)(aAddr >> 16);
williamr@2: 		i[16] = (TUint8)(aAddr >> 24);
williamr@2: 		}
williamr@2: 
williamr@2: 	//
williamr@2: 	// The old IPv4 stack leaves IP header in packet when passing it upwards,
williamr@2: 	// but this header is swapped into host order. As upper layers really don't
williamr@2: 	// need this stuff much, only few "compatibility" methods is defined here
williamr@2: 	//
williamr@2: 
williamr@2: 	inline TInt HostHeaderLength() const
williamr@2: 		{
williamr@2: 		/**
williamr@2: 		* Gets the Header Length from a header that is in Host byte order.
williamr@2: 		* @return Header Length
williamr@2: 		*
williamr@2: 		* @deprecated There is no reason to use swapped headers
williamr@2: 		*/
williamr@2: 		return (i[3] & 0x0f) * 4;
williamr@2: 		}
williamr@2: 	inline TInt HostProtocol() const
williamr@2: 		/**
williamr@2: 		* Gets the Protocol from a header that is in Host byte order.
williamr@2: 		* @return Protocol
williamr@2: 		* @deprecated There is no reason to use swapped headers
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		return i[10];
williamr@2: 		}
williamr@2: 
williamr@2: 	inline void Swap()
williamr@2: 		/**
williamr@2: 		* Swaps the byte order in the header.
williamr@2: 		* @deprecated There is no reason to use swapped headers
williamr@2: 		*/
williamr@2: 		{
williamr@2: 		*(TUint32 *)(&i[0]) = ByteOrder::Swap32(*(TUint32 *)(&i[0]));
williamr@2: 		*(TUint32 *)(&i[4]) = ByteOrder::Swap32(*(TUint32 *)(&i[4]));
williamr@2: 		*(TUint32 *)(&i[8]) = ByteOrder::Swap32(*(TUint32 *)(&i[8]));
williamr@2: 		*(TUint32 *)(&i[12]) = ByteOrder::Swap32(*(TUint32 *)(&i[12]));
williamr@2: 		*(TUint32 *)(&i[16]) = ByteOrder::Swap32(*(TUint32 *)(&i[16]));
williamr@2: 		}
williamr@2: 				
williamr@2: private:
williamr@2: 	union
williamr@2: 		{
williamr@4: 		TUint8 i[4*15];	//< This allocates maximum length (60 bytes)
williamr@4: 		TUint32 iAlign;	//< A dummy member to force the 4 byte alignment
williamr@2: 		};
williamr@2: 	};
williamr@2: 
williamr@2: /**
williamr@2: * @name IP v4 Option constants
williamr@2: * @since v7.0
williamr@2: * @publishedAll
williamr@2: * @released
williamr@2: */
williamr@4: //@{
williamr@2: const TUint8 KInet4Option_End			= 0x00;
williamr@2: const TUint8 KInet4Option_Nop			= 0x01;
williamr@2: 
williamr@2: const TUint8 KInet4OptionFlag_Copy		= 0x80;
williamr@4: //@}
williamr@2: 
williamr@2: //
williamr@2: //	ICMP v4 constants
williamr@2: //	=================
williamr@2: //
williamr@2: /**
williamr@2: * @name ICMP v4 constants 
williamr@2: * @since v7.0
williamr@2: * @publishedAll
williamr@2: * @released
williamr@2: */
williamr@4: //@{
williamr@2: /** Echo Reply. See TInet6HeaderICMP_Echo (IPv4 and IPv6 use the same format). */
williamr@2: const TUint8 KInet4ICMP_EchoReply		=  0;
williamr@2: const TUint8 KInet4ICMP_Unreachable		=  3;
williamr@2: const TUint8 KInet4ICMP_SourceQuench	=  4;
williamr@2: const TUint8 KInet4ICMP_Redirect		=  5;
williamr@2: /** Echo Request. See TInet6HeaderICMP_Echo (IPv4 and IPv6 use the same format). */
williamr@2: const TUint8 KInet4ICMP_Echo			=  8;
williamr@2: const TUint8 KInet4ICMP_TimeExceeded	= 11;
williamr@2: const TUint8 KInet4ICMP_ParameterProblem = 12;
williamr@2: const TUint8 KInet4ICMP_TimeStamp		= 13;
williamr@2: const TUint8 KInet4ICMP_TimeStampReply	= 14;
williamr@4: //@}
williamr@2: 
williamr@4: //@}
williamr@2: #endif