VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/checksum/ipv6.cpp@ 81106

Last change on this file since 81106 was 76553, checked in by vboxsync, 6 years ago

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File size: 5.2 KB
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1/* $Id: ipv6.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2/** @file
3 * IPRT - IPv6 Checksum calculation and validation.
4 */
5
6/*
7 * Copyright (C) 2008-2019 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*********************************************************************************************************************************
29* Header Files *
30*********************************************************************************************************************************/
31#include <iprt/net.h>
32#include "internal/iprt.h"
33
34#include <iprt/asm.h>
35#include <iprt/assert.h>
36
37
38/**
39 * @copydoc RTNetIPv6PseudoChecksumBits
40 */
41DECLINLINE(uint32_t) rtNetIPv6PseudoChecksumBits(PCRTNETADDRIPV6 pSrcAddr, PCRTNETADDRIPV6 pDstAddr,
42 uint8_t bProtocol, uint32_t cbPkt)
43{
44 uint32_t u32Sum = pSrcAddr->au16[0]
45 + pSrcAddr->au16[1]
46 + pSrcAddr->au16[2]
47 + pSrcAddr->au16[3]
48 + pSrcAddr->au16[4]
49 + pSrcAddr->au16[5]
50 + pSrcAddr->au16[6]
51 + pSrcAddr->au16[7]
52 + pDstAddr->au16[0]
53 + pDstAddr->au16[1]
54 + pDstAddr->au16[2]
55 + pDstAddr->au16[3]
56 + pDstAddr->au16[4]
57 + pDstAddr->au16[5]
58 + pDstAddr->au16[6]
59 + pDstAddr->au16[7]
60 + RT_H2BE_U16(RT_HIWORD(cbPkt))
61 + RT_H2BE_U16(RT_LOWORD(cbPkt))
62 + 0
63 + RT_H2BE_U16(RT_MAKE_U16(bProtocol, 0));
64 return u32Sum;
65}
66
67
68/**
69 * Calculates the checksum of a pseudo header given an IPv6 header, ASSUMING
70 * that there are no headers between the IPv6 header and the upper layer header.
71 *
72 * Use this method with create care! In most cases you should be using
73 * RTNetIPv6PseudoChecksumEx.
74 *
75 * @returns 32-bit intermediary checksum value.
76 * @param pIpHdr The IPv6 header (network endian (big)).
77 */
78RTDECL(uint32_t) RTNetIPv6PseudoChecksum(PCRTNETIPV6 pIpHdr)
79{
80 return rtNetIPv6PseudoChecksumBits(&pIpHdr->ip6_src, &pIpHdr->ip6_dst,
81 pIpHdr->ip6_nxt, RT_N2H_U16(pIpHdr->ip6_plen));
82}
83RT_EXPORT_SYMBOL(RTNetIPv6PseudoChecksum);
84
85
86/**
87 * Calculates the checksum of a pseudo header given an IPv6 header.
88 *
89 * @returns 32-bit intermediary checksum value.
90 * @param pIpHdr The IPv6 header (network endian (big)).
91 * @param bProtocol The protocol number. This can be the same as the
92 * ip6_nxt field, but doesn't need to be.
93 * @param cbPkt The packet size (host endian of course). This can
94 * be the same as the ip6_plen field, but as with @a
95 * bProtocol it won't be when extension headers are
96 * present. For UDP this will be uh_ulen converted to
97 * host endian.
98 */
99RTDECL(uint32_t) RTNetIPv6PseudoChecksumEx(PCRTNETIPV6 pIpHdr, uint8_t bProtocol, uint16_t cbPkt)
100{
101 return rtNetIPv6PseudoChecksumBits(&pIpHdr->ip6_src, &pIpHdr->ip6_dst, bProtocol, cbPkt);
102}
103RT_EXPORT_SYMBOL(RTNetIPv6PseudoChecksumEx);
104
105
106/**
107 * Calculates the checksum of a pseudo header given the individual components.
108 *
109 * @returns 32-bit intermediary checksum value.
110 * @param pSrcAddr Pointer to the source address in network endian.
111 * @param pDstAddr Pointer to the destination address in network endian.
112 * @param bProtocol The protocol number. This can be the same as the
113 * ip6_nxt field, but doesn't need to be.
114 * @param cbPkt The packet size (host endian of course). This can
115 * be the same as the ip6_plen field, but as with @a
116 * bProtocol it won't be when extension headers are
117 * present. For UDP this will be uh_ulen converted to
118 * host endian.
119 */
120RTDECL(uint32_t) RTNetIPv6PseudoChecksumBits(PCRTNETADDRIPV6 pSrcAddr, PCRTNETADDRIPV6 pDstAddr,
121 uint8_t bProtocol, uint16_t cbPkt)
122{
123 return rtNetIPv6PseudoChecksumBits(pSrcAddr, pDstAddr, bProtocol, cbPkt);
124}
125RT_EXPORT_SYMBOL(RTNetIPv6PseudoChecksumBits);
126
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