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