sys/netinet/sctp_crc32.c

   1 /*      $KAME: sctp_crc32.c,v 1.11 2004/08/17 04:06:16 itojun Exp $     */
   2 /*      $DragonFly: src/sys/netinet/sctp_crc32.c,v 1.1 2005/07/15 14:46:16 eirikn 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 #ifdef __APPLE__
  36 #include <sctp.h>
  37 #elif !defined(__OpenBSD__)
  38 #include "opt_sctp.h"
  39 #endif
  40 #include <sys/param.h>
  41 #include <netinet/sctp_crc32.h>
  42
  43 #ifndef SCTP_USE_ADLER32
  44
  45 #define SCTP_CRC32C_POLY 0x1EDC6F41
  46 #define SCTP_CRC32C(c, d) (c = ((c) >> 8) ^ sctp_crc_c[((c) ^ (d)) & 0xFF])
  47
  48 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  49 /* Copyright 2001, D. Otis.  Use this program, code or tables    */
  50 /* extracted from it, as desired without restriction.            */
  51 /*                                                               */
  52 /* 32 Bit Reflected CRC table generation for SCTP.               */
  53 /* To accommodate serial byte data being shifted out least       */
  54 /* significant bit first, the table's 32 bit words are reflected */
  55 /* which flips both byte and bit MS and LS positions.  The CRC   */
  56 /* is calculated MS bits first from the perspective of the serial*/
  57 /* stream.  The x^32 term is implied and the x^0 term may also   */
  58 /* be shown as +1.  The polynomial code used is 0x1EDC6F41.      */
  59 /* Castagnoli93                                                  */
  60 /* x^32+x^28+x^27+x^26+x^25+x^23+x^22+x^20+x^19+x^18+x^14+x^13+  */
  61 /* x^11+x^10+x^9+x^8+x^6+x^0                                     */
  62 /* Guy Castagnoli Stefan Braeuer and Martin Herrman              */
  63 /* "Optimization of Cyclic Redundancy-Check Codes                */
  64 /* with 24 and 32 Parity Bits",                                  */
  65 /* IEEE Transactions on Communications, Vol.41, No.6, June 1993  */
  66 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  67
  68 unsigned long  sctp_crc_c[256] = {
  69         0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
  70         0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
  71         0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
  72         0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
  73         0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
  74         0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
  75         0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
  76         0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
  77         0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
  78         0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
  79         0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
  80         0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
  81         0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
  82         0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
  83         0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
  84         0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
  85         0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
  86         0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
  87         0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
  88         0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
  89         0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
  90         0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
  91         0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
  92         0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
  93         0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
  94         0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
  95         0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
  96         0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
  97         0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
  98         0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
  99         0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
 100         0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
 101         0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
 102         0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
 103         0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
 104         0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
 105         0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
 106         0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
 107         0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
 108         0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
 109         0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
 110         0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
 111         0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
 112         0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
 113         0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
 114         0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
 115         0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
 116         0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
 117         0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
 118         0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
 119         0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
 120         0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
 121         0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
 122         0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
 123         0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
 124         0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
 125         0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
 126         0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
 127         0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
 128         0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
 129         0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
 130         0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
 131         0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
 132         0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L,
 133 };
 134
 135 u_int32_t
 136 update_crc32(u_int32_t crc32,
 137              unsigned char *buffer,
 138              unsigned int length)
 139 {
 140         unsigned int i;
 141
 142         for (i = 0; i < length; i++) {
 143                 SCTP_CRC32C(crc32, buffer[i]);
 144         }
 145         return (crc32);
 146 }
 147
 148
 149 u_int32_t
 150 sctp_csum_finalize(u_int32_t crc32)
 151 {
 152         u_int32_t result;
 153 #if BYTE_ORDER == BIG_ENDIAN
 154         u_int8_t byte0, byte1, byte2, byte3;
 155 #endif
 156         /* Complement the result */
 157         result = ~crc32;
 158 #if BYTE_ORDER == BIG_ENDIAN
 159         /*
 160          * For BIG-ENDIAN.. aka Motorola byte order the result is in
 161          * little-endian form. So we must manually swap the bytes. Then
 162          * we can call htonl() which does nothing...
 163          */
 164         byte0 = result & 0x000000ff;
 165         byte1 = (result >> 8) & 0x000000ff;
 166         byte2 = (result >> 16) & 0x000000ff;
 167         byte3 = (result >> 24) & 0x000000ff;
 168         result = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
 169         crc32 = htonl(result);
 170 #else
 171         /*
 172          * For INTEL platforms the result comes out in network order.
 173          * No htonl is required or the swap above. So we optimize out
 174          * both the htonl and the manual swap above.
 175          */
 176         crc32 = result;
 177 #endif
 178         return (crc32);
 179 }
 180
 181 #endif