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50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS TCP/IP protocol driver
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* FILE: include/checksum.h
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* PURPOSE: Checksum routine definitions
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*/
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#pragma once
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ULONG ChecksumFold(
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ULONG Sum);
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ULONG ChecksumCompute(
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PVOID Data,
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UINT Count,
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ULONG Seed);
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unsigned int
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csum_partial(
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const unsigned char * buff,
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int len,
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unsigned int sum);
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ULONG
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UDPv4ChecksumCalculate(
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PIPv4_HEADER IPHeader,
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PUCHAR PacketBuffer,
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ULONG DataLength);
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#define IPv4Checksum(Data, Count, Seed)(~ChecksumFold(ChecksumCompute(Data, Count, Seed)))
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#define TCPv4Checksum(Data, Count, Seed)(~ChecksumFold(csum_partial(Data, Count, Seed)))
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//#define TCPv4Checksum(Data, Count, Seed)(~ChecksumFold(ChecksumCompute(Data, Count, Seed)))
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/*
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* Macro to check for a correct checksum
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* BOOLEAN IPv4CorrectChecksum(PVOID Data, UINT Count)
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*/
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#define IPv4CorrectChecksum(Data, Count) \
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(BOOLEAN)(IPv4Checksum(Data, Count, 0) == DH2N(0x0000FFFF))
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/*
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* Macro to check for a correct checksum
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* BOOLEAN TCPv4CorrectChecksum(PTCPv4_PSEUDO_HEADER TcpPseudoHeader,
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* PVOID Data, UINT Count)
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*/
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#define TCPv4CorrectChecksum(TcpPseudoHeader, Data, Count) \
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(BOOLEAN)(TCPv4Checksum(Data, Count, \
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TCPv4Checksum(TcpPseudoHeader, sizeof(TCPv4_PSEUDO_HEADER), \
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0)) == DH2N(0x0000FFFF))
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