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diff --git a/sysdeps/unix/sysv/linux/net/ethernet.h b/sysdeps/unix/sysv/linux/net/ethernet.h
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+/* Copyright (C) 1997 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+/* 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 <linux/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
+{
+ u_int8_t ether_addr_octet[ETH_ALEN];
+};
+
+/* 10Mb/s ethernet header */
+struct ether_header
+{
+ u_int8_t ether_dhost[ETH_ALEN]; /* destination eth addr */
+ u_int8_t ether_shost[ETH_ALEN]; /* source ether addr */
+ u_int16_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 ethenet 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 */