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/* Copyright (C) 1997-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* Based on the FreeBSD version of this file. Curiously, that file
lacks a copyright in the header. */
#ifndef __NET_ETHERNET_H
#define __NET_ETHERNET_H 1
#include <sys/cdefs.h>
#include <sys/types.h>
#include <stdint.h>
#include <net/if_ether.h> /* IEEE 802.3 Ethernet constants */
__BEGIN_DECLS
/* This is a name for the 48 bit ethernet address available on many
systems. */
struct ether_addr
{
uint8_t ether_addr_octet[ETH_ALEN];
};
/* 10Mb/s ethernet header */
struct ether_header
{
uint8_t ether_dhost[ETH_ALEN]; /* destination eth addr */
uint8_t ether_shost[ETH_ALEN]; /* source ether addr */
uint16_t ether_type; /* packet type ID field */
};
/* Ethernet protocol ID's */
#define ETHERTYPE_PUP 0x0200 /* Xerox PUP */
#define ETHERTYPE_IP 0x0800 /* IP */
#define ETHERTYPE_ARP 0x0806 /* Address resolution */
#define ETHERTYPE_REVARP 0x8035 /* Reverse ARP */
#define ETHER_ADDR_LEN ETH_ALEN /* size of ethernet addr */
#define ETHER_TYPE_LEN 2 /* bytes in type field */
#define ETHER_CRC_LEN 4 /* bytes in CRC field */
#define ETHER_HDR_LEN ETH_HLEN /* total octets in header */
#define ETHER_MIN_LEN (ETH_ZLEN + ETH_CRC_LEN) /* min packet length */
#define ETHER_MAX_LEN (ETH_FRAME_LEN + ETH_CRC_LEN) /* max packet length */
/* make sure ethernet length is valid */
#define ETHER_IS_VALID_LEN(foo) \
((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
/*
* The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
* (type-ETHERTYPE_TRAIL)*512 bytes of data followed
* by an ETHER type (as given above) and then the (variable-length) header.
*/
#define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */
#define ETHERTYPE_NTRAILER 16
#define ETHERMTU ETH_DATA_LEN
#define ETHERMIN (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
__END_DECLS
#endif /* net/ethernet.h */
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