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      1 /*	$KAME: sctp_crc32.c,v 1.12 2005/03/06 16:04:17 itojun Exp $	*/
      2 /*	$NetBSD: sctp_crc32.c,v 1.3 2019/08/13 19:55:40 rjs 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 1.3 2019/08/13 19:55:40 rjs 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 #define SCTP_CRC32C_POLY 0x1EDC6F41
     47 #define SCTP_CRC32C(c, d) (c = ((c) >> 8) ^ sctp_crc_c[((c) ^ (d)) & 0xFF])
     48 
     49 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
     50 /* Copyright 2001, D. Otis.  Use this program, code or tables    */
     51 /* extracted from it, as desired without restriction.            */
     52 /*                                                               */
     53 /* 32 Bit Reflected CRC table generation for SCTP.               */
     54 /* To accommodate serial byte data being shifted out least       */
     55 /* significant bit first, the table's 32 bit words are reflected */
     56 /* which flips both byte and bit MS and LS positions.  The CRC   */
     57 /* is calculated MS bits first from the perspective of the serial*/
     58 /* stream.  The x^32 term is implied and the x^0 term may also   */
     59 /* be shown as +1.  The polynomial code used is 0x1EDC6F41.      */
     60 /* Castagnoli93                                                  */
     61 /* x^32+x^28+x^27+x^26+x^25+x^23+x^22+x^20+x^19+x^18+x^14+x^13+  */
     62 /* x^11+x^10+x^9+x^8+x^6+x^0                                     */
     63 /* Guy Castagnoli Stefan Braeuer and Martin Herrman              */
     64 /* "Optimization of Cyclic Redundancy-Check Codes                */
     65 /* with 24 and 32 Parity Bits",                                  */
     66 /* IEEE Transactions on Communications, Vol.41, No.6, June 1993  */
     67 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
     68 
     69 const unsigned long  sctp_crc_c[256] = {
     70 	0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
     71 	0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
     72 	0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
     73 	0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
     74 	0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
     75 	0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
     76 	0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
     77 	0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
     78 	0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
     79 	0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
     80 	0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
     81 	0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
     82 	0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
     83 	0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
     84 	0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
     85 	0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
     86 	0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
     87 	0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
     88 	0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
     89 	0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
     90 	0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
     91 	0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
     92 	0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
     93 	0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
     94 	0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
     95 	0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
     96 	0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
     97 	0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
     98 	0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
     99 	0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
    100 	0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
    101 	0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
    102 	0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
    103 	0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
    104 	0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
    105 	0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
    106 	0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
    107 	0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
    108 	0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
    109 	0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
    110 	0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
    111 	0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
    112 	0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
    113 	0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
    114 	0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
    115 	0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
    116 	0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
    117 	0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
    118 	0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
    119 	0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
    120 	0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
    121 	0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
    122 	0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
    123 	0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
    124 	0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
    125 	0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
    126 	0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
    127 	0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
    128 	0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
    129 	0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
    130 	0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
    131 	0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
    132 	0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
    133 	0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L,
    134 };
    135 
    136 u_int32_t
    137 update_crc32(u_int32_t crc32c,
    138 	     unsigned char *buffer,
    139 	     unsigned int length)
    140 {
    141 	unsigned int i;
    142 
    143 	for (i = 0; i < length; i++) {
    144 		SCTP_CRC32C(crc32c, buffer[i]);
    145 	}
    146 	return (crc32c);
    147 }
    148 
    149 
    150 u_int32_t
    151 sctp_csum_finalize(u_int32_t crc32c)
    152 {
    153 	u_int32_t result;
    154 #if BYTE_ORDER == BIG_ENDIAN
    155 	u_int8_t byte0, byte1, byte2, byte3;
    156 #endif
    157 	/* Complement the result */
    158 	result = ~crc32c;
    159 #if BYTE_ORDER == BIG_ENDIAN
    160 	/*
    161 	 * For BIG-ENDIAN.. aka Motorola byte order the result is in
    162 	 * little-endian form. So we must manually swap the bytes. Then
    163 	 * we can call htonl() which does nothing...
    164 	 */
    165 	byte0 = result & 0x000000ff;
    166 	byte1 = (result >> 8) & 0x000000ff;
    167 	byte2 = (result >> 16) & 0x000000ff;
    168 	byte3 = (result >> 24) & 0x000000ff;
    169 	result = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
    170 	crc32c = htonl(result);
    171 #else
    172 	/*
    173 	 * For INTEL platforms the result comes out in network order.
    174 	 * No htonl is required or the swap above. So we optimize out
    175 	 * both the htonl and the manual swap above.
    176 	 */
    177 	crc32c = result;
    178 #endif
    179 	return (crc32c);
    180 }
    181 
    182