reactos/drivers/net/tcpip/include/checksum.h

   1 /*
   2  * COPYRIGHT:   See COPYING in the top level directory
   3  * PROJECT:     ReactOS TCP/IP protocol driver
   4  * FILE:        include/checksum.h
   5  * PURPOSE:     Checksum routine definitions
   6  */
   7 #ifndef __CHECKSUM_H
   8 #define __CHECKSUM_H
   9
  10
  11 ULONG ChecksumFold(
  12   ULONG Sum);
  13
  14 ULONG ChecksumCompute(
  15     PVOID Data,
  16     UINT Count,
  17     ULONG Seed);
  18
  19 unsigned int
  20 csum_partial(
  21   const unsigned char * buff,
  22   int len,
  23   unsigned int sum);
  24
  25 #define IPv4Checksum(Data, Count, Seed)(~ChecksumFold(ChecksumCompute(Data, Count, Seed)))
  26 #define TCPv4Checksum(Data, Count, Seed)(~ChecksumFold(csum_partial(Data, Count, Seed)))
  27 //#define TCPv4Checksum(Data, Count, Seed)(~ChecksumFold(ChecksumCompute(Data, Count, Seed)))
  28
  29 /*
  30  * Macro to check for a correct checksum
  31  * BOOLEAN IPv4CorrectChecksum(PVOID Data, UINT Count)
  32  */
  33 #define IPv4CorrectChecksum(Data, Count) \
  34     (BOOLEAN)(IPv4Checksum(Data, Count, 0) == DH2N(0x0000FFFF))
  35
  36 /*
  37  * Macro to check for a correct checksum
  38  * BOOLEAN TCPv4CorrectChecksum(PTCPv4_PSEUDO_HEADER TcpPseudoHeader,
  39  *   PVOID Data, UINT Count)
  40  */
  41 #define TCPv4CorrectChecksum(TcpPseudoHeader, Data, Count) \
  42     (BOOLEAN)(TCPv4Checksum(Data, Count, \
  43       TCPv4Checksum(TcpPseudoHeader, sizeof(TCPv4_PSEUDO_HEADER), \
  44       0)) == DH2N(0x0000FFFF))
  45
  46 #endif /* __CHECKSUM_H */