1 /* $NetBSD: if_ether.h,v 1.58 2010/05/19 20:41:59 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 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_ether.h 8.1 (Berkeley) 6/10/93 32 */ 33 34 #ifndef _NET_IF_ETHER_H_ 35 #define _NET_IF_ETHER_H_ 36 37 /* 38 * Some basic Ethernet constants. 39 */ 40 #define ETHER_ADDR_LEN 6 /* length of an Ethernet address */ 41 #define ETHER_TYPE_LEN 2 /* length of the Ethernet type field */ 42 #define ETHER_CRC_LEN 4 /* length of the Ethernet CRC */ 43 #define ETHER_HDR_LEN ((ETHER_ADDR_LEN * 2) + ETHER_TYPE_LEN) 44 #define ETHER_MIN_LEN 64 /* minimum frame length, including CRC */ 45 #define ETHER_MAX_LEN 1518 /* maximum frame length, including CRC */ 46 #define ETHER_MAX_LEN_JUMBO 9018 /* maximum jumbo frame len, including CRC */ 47 48 /* 49 * Some Ethernet extensions. 50 */ 51 #define ETHER_VLAN_ENCAP_LEN 4 /* length of 802.1Q VLAN encapsulation */ 52 #define ETHER_PPPOE_ENCAP_LEN 8 /* length of PPPoE encapsulation */ 53 54 /* 55 * Ethernet address - 6 octets 56 * this is only used by the ethers(3) functions. 57 */ 58 struct ether_addr { 59 uint8_t ether_addr_octet[ETHER_ADDR_LEN]; 60 } __packed; 61 62 /* 63 * Structure of a 10Mb/s Ethernet header. 64 */ 65 struct ether_header { 66 uint8_t ether_dhost[ETHER_ADDR_LEN]; 67 uint8_t ether_shost[ETHER_ADDR_LEN]; 68 uint16_t ether_type; 69 } __packed; 70 71 #include <net/ethertypes.h> 72 73 #define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */ 74 #define ETHER_IS_LOCAL(addr) (*(addr) & 0x02) /* is address local? */ 75 76 #define ETHERMTU_JUMBO (ETHER_MAX_LEN_JUMBO - ETHER_HDR_LEN - ETHER_CRC_LEN) 77 #define ETHERMTU (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN) 78 #define ETHERMIN (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN) 79 80 /* 81 * Compute the maximum frame size based on ethertype (i.e. possible 82 * encapsulation) and whether or not an FCS is present. 83 */ 84 #define ETHER_MAX_FRAME(ifp, etype, hasfcs) \ 85 ((ifp)->if_mtu + ETHER_HDR_LEN + \ 86 ((hasfcs) ? ETHER_CRC_LEN : 0) + \ 87 (((etype) == ETHERTYPE_VLAN) ? ETHER_VLAN_ENCAP_LEN : 0) + \ 88 (((etype) == ETHERTYPE_PPPOE) ? ETHER_PPPOE_ENCAP_LEN : 0)) 89 90 /* 91 * Ethernet CRC32 polynomials (big- and little-endian verions). 92 */ 93 #define ETHER_CRC_POLY_LE 0xedb88320 94 #define ETHER_CRC_POLY_BE 0x04c11db6 95 96 /* 97 * Prototype ethers(3) functions. 98 */ 99 #include <sys/cdefs.h> 100 __BEGIN_DECLS 101 char * ether_ntoa(const struct ether_addr *); 102 struct ether_addr * 103 ether_aton(const char *); 104 int ether_ntohost(char *, const struct ether_addr *); 105 int ether_hostton(const char *, struct ether_addr *); 106 int ether_line(const char *, struct ether_addr *, char *); 107 __END_DECLS 108 109 #endif /* !_NET_IF_ETHER_H_ */ 110