1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93 32 * $FreeBSD$ 33 */ 34 35static inline u_int32_t 36ether_crc32_le_update(u_int32_t crc, const u_int8_t *buf, size_t len) 37{ 38 static const u_int32_t crctab[] = { 39 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 40 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 41 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 42 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 43 }; 44 size_t i; 45 46 for (i = 0; i < len; i++) { 47 crc ^= buf[i]; 48 crc = (crc >> 4) ^ crctab[crc & 0xf]; 49 crc = (crc >> 4) ^ crctab[crc & 0xf]; 50 } 51 52 return (crc); 53} 54 55 56static inline u_int32_t 57ether_crc32_be_update(u_int32_t crc, const u_int8_t *buf, size_t len) 58{ 59 static const u_int8_t rev[] = { 60 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe, 61 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf 62 }; 63 static const u_int32_t crctab[] = { 64 0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 65 0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005, 66 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61, 67 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd 68 }; 69 size_t i; 70 u_int8_t data; 71 72 for (i = 0; i < len; i++) { 73 data = buf[i]; 74 crc = (crc << 4) ^ crctab[(crc >> 28) ^ rev[data & 0xf]]; 75 crc = (crc << 4) ^ crctab[(crc >> 28) ^ rev[data >> 4]]; 76 } 77 78 return (crc); 79} 80