1 /* $KAME: sctp_crc32.c,v 1.12 2005/03/06 16:04:17 itojun Exp $ */ 2 /* $NetBSD: sctp_crc32.c,v 1.2 2016/08/12 19:08:54 jdolecek Exp $ */ 3 4 /* 5 * Copyright (c) 2001, 2002, 2003, 2004 Cisco Systems, Inc. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Cisco Systems, Inc. 19 * 4. Neither the name of the project nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY CISCO SYSTEMS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL CISCO SYSTEMS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: sctp_crc32.c,v 1.2 2016/08/12 19:08:54 jdolecek Exp $"); 38 39 #ifdef _KERNEL_OPT 40 #include "opt_sctp.h" 41 #endif /* _KERNEL_OPT */ 42 43 #include <sys/param.h> 44 #include <netinet/sctp_crc32.h> 45 46 #ifndef SCTP_USE_ADLER32 47 48 #define SCTP_CRC32C_POLY 0x1EDC6F41 49 #define SCTP_CRC32C(c, d) (c = ((c) >> 8) ^ sctp_crc_c[((c) ^ (d)) & 0xFF]) 50 51 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ 52 /* Copyright 2001, D. Otis. Use this program, code or tables */ 53 /* extracted from it, as desired without restriction. */ 54 /* */ 55 /* 32 Bit Reflected CRC table generation for SCTP. */ 56 /* To accommodate serial byte data being shifted out least */ 57 /* significant bit first, the table's 32 bit words are reflected */ 58 /* which flips both byte and bit MS and LS positions. The CRC */ 59 /* is calculated MS bits first from the perspective of the serial*/ 60 /* stream. The x^32 term is implied and the x^0 term may also */ 61 /* be shown as +1. The polynomial code used is 0x1EDC6F41. */ 62 /* Castagnoli93 */ 63 /* x^32+x^28+x^27+x^26+x^25+x^23+x^22+x^20+x^19+x^18+x^14+x^13+ */ 64 /* x^11+x^10+x^9+x^8+x^6+x^0 */ 65 /* Guy Castagnoli Stefan Braeuer and Martin Herrman */ 66 /* "Optimization of Cyclic Redundancy-Check Codes */ 67 /* with 24 and 32 Parity Bits", */ 68 /* IEEE Transactions on Communications, Vol.41, No.6, June 1993 */ 69 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ 70 71 const unsigned long sctp_crc_c[256] = { 72 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L, 73 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL, 74 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL, 75 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L, 76 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL, 77 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L, 78 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L, 79 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL, 80 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL, 81 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L, 82 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L, 83 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL, 84 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L, 85 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL, 86 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL, 87 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L, 88 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L, 89 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L, 90 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L, 91 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L, 92 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L, 93 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L, 94 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L, 95 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L, 96 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L, 97 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L, 98 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L, 99 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L, 100 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L, 101 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L, 102 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L, 103 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L, 104 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL, 105 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L, 106 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L, 107 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL, 108 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L, 109 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL, 110 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL, 111 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L, 112 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L, 113 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL, 114 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL, 115 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L, 116 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL, 117 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L, 118 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L, 119 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL, 120 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L, 121 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL, 122 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL, 123 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L, 124 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL, 125 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L, 126 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L, 127 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL, 128 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL, 129 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L, 130 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L, 131 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL, 132 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L, 133 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL, 134 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL, 135 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L, 136 }; 137 138 u_int32_t 139 update_crc32(u_int32_t crc32c, 140 unsigned char *buffer, 141 unsigned int length) 142 { 143 unsigned int i; 144 145 for (i = 0; i < length; i++) { 146 SCTP_CRC32C(crc32c, buffer[i]); 147 } 148 return (crc32c); 149 } 150 151 152 u_int32_t 153 sctp_csum_finalize(u_int32_t crc32c) 154 { 155 u_int32_t result; 156 #if BYTE_ORDER == BIG_ENDIAN 157 u_int8_t byte0, byte1, byte2, byte3; 158 #endif 159 /* Complement the result */ 160 result = ~crc32c; 161 #if BYTE_ORDER == BIG_ENDIAN 162 /* 163 * For BIG-ENDIAN.. aka Motorola byte order the result is in 164 * little-endian form. So we must manually swap the bytes. Then 165 * we can call htonl() which does nothing... 166 */ 167 byte0 = result & 0x000000ff; 168 byte1 = (result >> 8) & 0x000000ff; 169 byte2 = (result >> 16) & 0x000000ff; 170 byte3 = (result >> 24) & 0x000000ff; 171 result = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3); 172 crc32c = htonl(result); 173 #else 174 /* 175 * For INTEL platforms the result comes out in network order. 176 * No htonl is required or the swap above. So we optimize out 177 * both the htonl and the manual swap above. 178 */ 179 crc32c = result; 180 #endif 181 return (crc32c); 182 } 183 184 #endif 185