author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 26 Jan 2010 15:23:49 +0200 | |
changeset 0 | af10295192d8 |
child 5 | 1422c6cd3f0c |
permissions | -rw-r--r-- |
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// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// in_chk.h - IPv6/IPv4 checksum module |
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// Raw Internet Checksum computation from RMBufChain. |
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// |
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/** |
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@file in_chk.h |
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@publishedAll |
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@released |
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*/ |
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#ifndef __IN_CHK_H__ |
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#define __IN_CHK_H__ |
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#include <nifmbuf.h> |
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#include "in_pkt.h" |
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/** Checksum calculation. |
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@publishedAll |
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@released |
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*/ |
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class TChecksum { |
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public: |
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// TChecksum can be initialized with an old inverted checksum |
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TChecksum(TUint16 aSum = ~0) : iSum((TUint16)~aSum) {} |
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inline void Init(TUint16 aSum = ~0); |
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inline TUint32 Sum(); |
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inline TUint32 Sum32(); |
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inline void Fold(); |
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inline void Reverse(); |
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// Complex Add methods |
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IMPORT_C void Add(RMBufChain &aPacket, TInt aOffset); |
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IMPORT_C void Add(RMBufChain &aPacket, const RMBufPktInfo *aInfo, TInt aOffset); |
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// Inline Add methods |
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inline void Add(const TUint16 *aPtr, TInt aLength); |
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inline void AddHi(TUint8 aByte); |
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inline void AddLo(TUint8 aByte); |
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inline void Add(TUint16 aHalfWord); |
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inline void Add(TUint32 aWord); |
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inline void AddH(TUint16 aHalfWord); |
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inline void AddH(TUint32 aWord); |
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// Static methods |
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static inline TUint32 Fold(TUint32 aSum); |
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static inline TUint16 ComplementedFold(TUint32 aSum); |
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IMPORT_C static TUint32 Calculate(const TUint16 *aPtr, TInt aLength); |
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private: |
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TUint32 iSum; // 32-bit sum in network byte order |
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}; |
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/** |
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// TInet6Checksum Template. |
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// |
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// This template class provides utilitlies to compute and check |
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// IPv6 Upper Layer Checksums |
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// These are not merged with the TInet6Packet class, because that |
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// class is intended (and is used) for all headers, not just upper |
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// layers. |
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// |
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// The template parameter (Header class) must |
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// - have Checksum() method |
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// - have SetChecksum() method |
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// - the checkum in header must be aligned to 16 bit word |
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// |
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// @publishedAll |
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// @released |
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*/ |
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template <class T> |
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class TInet6Checksum : public TInet6Packet<T> |
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{ |
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public: |
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TInet6Checksum() {} |
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TInet6Checksum(RMBufChain &aPacket) : TInet6Packet<T>(aPacket) {} |
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TInet6Checksum(RMBufChain &aPacket, TInt aOffset) : TInet6Packet<T>(aPacket, aOffset) {} |
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void ComputeChecksum(RMBufChain &aPacket, const RMBufPktInfo *aInfo, TInt aOffset = 0); |
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TBool VerifyChecksum(RMBufChain &aPacket, const RMBufPktInfo *aInfo, TInt aOffset = 0); |
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void ComputeChecksum(); |
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TBool VerifyChecksum(); |
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}; |
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// |
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// Inline methods for TChecksum |
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// |
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inline void TChecksum::Init(TUint16 aSum) |
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{ |
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iSum = ~aSum & 0xffff; |
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} |
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109 |
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inline void TChecksum::Add(const TUint16 *aPtr, TInt aLength) |
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111 |
{ |
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iSum += Calculate(aPtr, aLength); |
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} |
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114 |
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inline void TChecksum::AddHi(TUint8 aByte) |
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{ |
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iSum += (aByte << 8); |
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} |
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119 |
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inline void TChecksum::AddLo(TUint8 aByte) |
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121 |
{ |
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iSum += aByte; |
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} |
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124 |
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// Add halfword in network byte order |
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inline void TChecksum::Add(TUint16 aHalfWord) |
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127 |
{ |
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iSum += aHalfWord; |
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} |
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130 |
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// Add word in network byte order |
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inline void TChecksum::Add(TUint32 aWord) |
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{ |
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iSum += aWord >> 16; |
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iSum += aWord & 0xffff; |
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} |
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137 |
|
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// Add halfword in host byte order |
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inline void TChecksum::AddH(TUint16 aHalfWord) |
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{ |
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__DEBUG_ONLY (const TInt one = 1;) |
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ASSERT(*(TUint8*)&one); //check that we are little-endian |
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143 |
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iSum += ((aHalfWord << 8) | (aHalfWord >> 8)) & 0xffff; |
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} |
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146 |
|
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// Add word in host byte order |
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inline void TChecksum::AddH(TUint32 aWord) |
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{ |
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__DEBUG_ONLY (const TInt one = 1;) |
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ASSERT(*(TUint8*)&one); //check that we are little-endian |
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152 |
|
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iSum += (aWord >> 24); // add octet 3 |
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iSum += (aWord >> 8) & 0xffff, // add octets 2-1 |
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iSum += (aWord << 8) & 0xff00; // add octet 0 |
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} |
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157 |
|
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// Fold 32-bit sum into 16 bits |
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inline void TChecksum::Fold() |
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{ |
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iSum = Fold(iSum); |
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} |
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|
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// Return 16-bit inverted checksum |
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inline TUint32 TChecksum::Sum() |
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{ |
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return Fold(iSum) ^ 0xffff; |
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} |
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169 |
|
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// Return 32-bit intermediate sum |
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inline TUint32 TChecksum::Sum32() |
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{ |
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return iSum; |
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} |
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175 |
|
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// Reverse checksum direction. Can be used to back out partial sums. |
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inline void TChecksum::Reverse() |
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{ |
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iSum = Sum(); |
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} |
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181 |
|
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inline TUint32 TChecksum::Fold(TUint32 aSum) |
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{ |
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aSum = (aSum >> 16) + (aSum & 0xffff); // Max: 0x0001fffe |
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aSum += (aSum >> 16); // Max: 0x0001ffff |
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return aSum & 0xffff; // Truncate to 16 bits |
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} |
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|
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inline TUint16 TChecksum::ComplementedFold(TUint32 aSum) |
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{ |
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return (TUint16)~Fold(aSum); |
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} |
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193 |
|
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template <class T> |
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void TInet6Checksum<T>::ComputeChecksum(RMBufChain &aPacket, const RMBufPktInfo *aInfo, TInt aOffset) |
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{ |
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TChecksum sum; |
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this->iHdr->SetChecksum(0); |
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sum.Add(aPacket, aInfo, aOffset); |
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this->iHdr->SetChecksum(sum.Sum()); |
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} |
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202 |
|
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template <class T> |
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TBool TInet6Checksum<T>::VerifyChecksum(RMBufChain &aPacket, const RMBufPktInfo *aInfo, TInt aOffset) |
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{ |
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TChecksum sum; |
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sum.Add(aPacket, aInfo, aOffset); |
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return !sum.Sum(); |
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} |
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// |
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// The following are mainly for the IPv4 Header checksum |
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// |
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template <class T> |
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void TInet6Checksum<T>::ComputeChecksum() |
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{ |
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TChecksum sum; |
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this->iHdr->SetChecksum(0); |
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sum.Add((TUint16 *)(this->iHdr), this->iHdr->HeaderLength()); |
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this->iHdr->SetChecksum(sum.Sum()); |
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} |
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|
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template <class T> |
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TBool TInet6Checksum<T>::VerifyChecksum() |
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{ |
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TChecksum sum; |
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sum.Add((TUint16*)(this->iHdr), this->iHdr->HeaderLength()); |
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return !sum.Sum(); |
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} |
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#endif |