/*- * Copyright (c) 1982, 1989, 1993 *	The Regents of the University of California.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors *    may be used to endorse or promote products derived from this software *    without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * *	@(#)if_ethersubr.c	8.1 (Berkeley) 6/10/93 * $FreeBSD: src/sys/net/if_ethersubr.c,v 1.177.2.14 2008/02/12 22:27:27 emaste Exp $ */#include "types.h"/*  * From FreeBSD sys/net/ethernet.h * Ethernet CRC32 polynomials (big- and little-endian verions). */#define ETHER_CRC_POLY_LE       0xedb88320#define ETHER_CRC_POLY_BE       0x04c11db6/* FreeBSD has a faster version but it uses more memory - we're using the reference version */uint32_tether_crc32_le(const uint8_t *buf, size_t len){	size_t i;	uint32_t crc, carry;	int bit;	uint8_t data;	crc = 0xffffffff;	/* initial value */	for (i = 0; i < len; i++) {		for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1)			carry = (crc ^ data) & 1;			crc >>= 1;			if (carry)				crc = (crc ^ ETHER_CRC_POLY_LE);	}	return (crc);}