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/* $Id: ipv6.cpp $ */
/** @file
* IPRT - IPv6 Checksum calculation and validation.
*/
/*
* Copyright (C) 2008-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/net.h>
#include "internal/iprt.h"
#include <iprt/asm.h>
#include <iprt/assert.h>
/**
* @copydoc RTNetIPv6PseudoChecksumBits
*/
DECLINLINE(uint32_t) rtNetIPv6PseudoChecksumBits(PCRTNETADDRIPV6 pSrcAddr, PCRTNETADDRIPV6 pDstAddr,
uint8_t bProtocol, uint32_t cbPkt)
{
uint32_t u32Sum = pSrcAddr->au16[0]
+ pSrcAddr->au16[1]
+ pSrcAddr->au16[2]
+ pSrcAddr->au16[3]
+ pSrcAddr->au16[4]
+ pSrcAddr->au16[5]
+ pSrcAddr->au16[6]
+ pSrcAddr->au16[7]
+ pDstAddr->au16[0]
+ pDstAddr->au16[1]
+ pDstAddr->au16[2]
+ pDstAddr->au16[3]
+ pDstAddr->au16[4]
+ pDstAddr->au16[5]
+ pDstAddr->au16[6]
+ pDstAddr->au16[7]
+ RT_H2BE_U16(RT_HIWORD(cbPkt))
+ RT_H2BE_U16(RT_LOWORD(cbPkt))
+ 0
+ RT_H2BE_U16(RT_MAKE_U16(bProtocol, 0));
return u32Sum;
}
/**
* Calculates the checksum of a pseudo header given an IPv6 header, ASSUMING
* that there are no headers between the IPv6 header and the upper layer header.
*
* Use this method with create care! In most cases you should be using
* RTNetIPv6PseudoChecksumEx.
*
* @returns 32-bit intermediary checksum value.
* @param pIpHdr The IPv6 header (network endian (big)).
*/
RTDECL(uint32_t) RTNetIPv6PseudoChecksum(PCRTNETIPV6 pIpHdr)
{
return rtNetIPv6PseudoChecksumBits(&pIpHdr->ip6_src, &pIpHdr->ip6_dst,
pIpHdr->ip6_nxt, RT_N2H_U16(pIpHdr->ip6_plen));
}
RT_EXPORT_SYMBOL(RTNetIPv6PseudoChecksum);
/**
* Calculates the checksum of a pseudo header given an IPv6 header.
*
* @returns 32-bit intermediary checksum value.
* @param pIpHdr The IPv6 header (network endian (big)).
* @param bProtocol The protocol number. This can be the same as the
* ip6_nxt field, but doesn't need to be.
* @param cbPkt The packet size (host endian of course). This can
* be the same as the ip6_plen field, but as with @a
* bProtocol it won't be when extension headers are
* present. For UDP this will be uh_ulen converted to
* host endian.
*/
RTDECL(uint32_t) RTNetIPv6PseudoChecksumEx(PCRTNETIPV6 pIpHdr, uint8_t bProtocol, uint16_t cbPkt)
{
return rtNetIPv6PseudoChecksumBits(&pIpHdr->ip6_src, &pIpHdr->ip6_dst, bProtocol, cbPkt);
}
RT_EXPORT_SYMBOL(RTNetIPv6PseudoChecksumEx);
/**
* Calculates the checksum of a pseudo header given the individual components.
*
* @returns 32-bit intermediary checksum value.
* @param pSrcAddr Pointer to the source address in network endian.
* @param pDstAddr Pointer to the destination address in network endian.
* @param bProtocol The protocol number. This can be the same as the
* ip6_nxt field, but doesn't need to be.
* @param cbPkt The packet size (host endian of course). This can
* be the same as the ip6_plen field, but as with @a
* bProtocol it won't be when extension headers are
* present. For UDP this will be uh_ulen converted to
* host endian.
*/
RTDECL(uint32_t) RTNetIPv6PseudoChecksumBits(PCRTNETADDRIPV6 pSrcAddr, PCRTNETADDRIPV6 pDstAddr,
uint8_t bProtocol, uint16_t cbPkt)
{
return rtNetIPv6PseudoChecksumBits(pSrcAddr, pDstAddr, bProtocol, cbPkt);
}
RT_EXPORT_SYMBOL(RTNetIPv6PseudoChecksumBits);
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