1 /* 2 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if_ether.h 8.3 (Berkeley) 5/2/95 30 */ 31 32 #define ETHERMTU 1500 33 34 /* 35 * The number of bytes in an ethernet (MAC) address. 36 */ 37 #define ETHER_ADDR_LEN 6 38 39 /* 40 * Structure of a DEC/Intel/Xerox or 802.3 Ethernet header. 41 */ 42 struct ether_header { 43 uint8_t ether_dhost[ETHER_ADDR_LEN]; 44 uint8_t ether_shost[ETHER_ADDR_LEN]; 45 uint16_t ether_type; 46 }; 47 48 /* 49 * Length of a DEC/Intel/Xerox or 802.3 Ethernet header; note that some 50 * compilers may pad "struct ether_header" to a multiple of 4 bytes, 51 * for example, so "sizeof (struct ether_header)" may not give the right 52 * answer. 53 */ 54 #define ETHER_HDRLEN 14 55