107 lines
3.9 KiB
C++
107 lines
3.9 KiB
C++
/*
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* Copyright (c) 2017, Matias Fontanini
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef TINS_CHECKSUM_UTILS_H
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#define TINS_CHECKSUM_UTILS_H
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#include <stdint.h>
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#include <tins/macros.h>
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namespace Tins {
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class IPv4Address;
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class IPv6Address;
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namespace Utils {
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/**
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* \brief Does the 16 bits sum of all 2 bytes elements between start and end.
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*
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* This is the checksum used by IP, UDP and TCP. If there's and odd number of
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* bytes, the last one is padded and added to the checksum.
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* \param start The pointer to the start of the buffer.
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* \param end The pointer to the end of the buffer(excluding the last element).
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* \return Returns the checksum between start and end (non inclusive)
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* in network endian
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*/
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TINS_API uint32_t do_checksum(const uint8_t* start, const uint8_t* end);
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/**
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* \brief Computes the 16 bit sum of the input buffer.
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*
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* If there's and odd number of bytes in the buffer, the last one is padded and
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* added to the checksum.
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* \param start The pointer to the start of the buffer.
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* \param end The pointer to the end of the buffer(excluding the last element).
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* \return Returns the checksum between start and end (non inclusive)
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* in network endian
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*/
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TINS_API uint16_t sum_range(const uint8_t* start, const uint8_t* end);
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/**
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* \brief Performs the pseudo header checksum used in TCP and UDP PDUs.
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*
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* \param source_ip The source ip address.
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* \param dest_ip The destination ip address.
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* \param len The length to be included in the pseudo header.
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* \param flag The flag to use in the protocol field of the pseudo header.
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* \return The pseudo header checksum.
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*/
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TINS_API uint32_t pseudoheader_checksum(IPv4Address source_ip,
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IPv4Address dest_ip,
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uint16_t len,
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uint16_t flag);
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/**
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* \brief Performs the pseudo header checksum used in TCP and UDP PDUs.
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*
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* \param source_ip The source ip address.
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* \param dest_ip The destination ip address.
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* \param len The length to be included in the pseudo header.
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* \param flag The flag to use in the protocol field of the pseudo header.
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* \return The pseudo header checksum.
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*/
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TINS_API uint32_t pseudoheader_checksum(IPv6Address source_ip,
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IPv6Address dest_ip,
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uint16_t len,
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uint16_t flag);
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/**
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* \brief Returns the 32 bit crc of the given buffer.
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*
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* \param data The input buffer.
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* \param data_size The size of the input buffer.
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*/
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TINS_API uint32_t crc32(const uint8_t* data, uint32_t data_size);
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} // Utils
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} // Tins
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#endif // TINS_CHECKSUM_UTILS_H
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