77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
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/* Copyright (C) 1997-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Based on the FreeBSD version of this file. Curiously, that file
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lacks a copyright in the header. */
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#ifndef __NET_ETHERNET_H
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#define __NET_ETHERNET_H 1
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <net/if_ether.h> /* IEEE 802.3 Ethernet constants */
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__BEGIN_DECLS
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/* This is a name for the 48 bit ethernet address available on many
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systems. */
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struct ether_addr
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{
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uint8_t ether_addr_octet[ETH_ALEN];
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};
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/* 10Mb/s ethernet header */
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struct ether_header
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{
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uint8_t ether_dhost[ETH_ALEN]; /* destination eth addr */
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uint8_t ether_shost[ETH_ALEN]; /* source ether addr */
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uint16_t ether_type; /* packet type ID field */
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};
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/* Ethernet protocol ID's */
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#define ETHERTYPE_PUP 0x0200 /* Xerox PUP */
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#define ETHERTYPE_IP 0x0800 /* IP */
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#define ETHERTYPE_ARP 0x0806 /* Address resolution */
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#define ETHERTYPE_REVARP 0x8035 /* Reverse ARP */
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#define ETHER_ADDR_LEN ETH_ALEN /* size of ethernet addr */
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#define ETHER_TYPE_LEN 2 /* bytes in type field */
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#define ETHER_CRC_LEN 4 /* bytes in CRC field */
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#define ETHER_HDR_LEN ETH_HLEN /* total octets in header */
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#define ETHER_MIN_LEN (ETH_ZLEN + ETH_CRC_LEN) /* min packet length */
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#define ETHER_MAX_LEN (ETH_FRAME_LEN + ETH_CRC_LEN) /* max packet length */
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/* make sure ethernet length is valid */
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#define ETHER_IS_VALID_LEN(foo) \
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((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
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/*
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* The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
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* (type-ETHERTYPE_TRAIL)*512 bytes of data followed
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* by an ETHER type (as given above) and then the (variable-length) header.
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*/
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#define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */
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#define ETHERTYPE_NTRAILER 16
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#define ETHERMTU ETH_DATA_LEN
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#define ETHERMIN (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
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__END_DECLS
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#endif /* net/ethernet.h */
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