1/* Copyright (C) 1996-2025 Free Software Foundation, Inc.
  2   This file is part of the GNU C Library.
  3
  4   The GNU C Library is free software; you can redistribute it and/or
  5   modify it under the terms of the GNU Lesser General Public
  6   License as published by the Free Software Foundation; either
  7   version 2.1 of the License, or (at your option) any later version.
  8
  9   The GNU C Library is distributed in the hope that it will be useful,
 10   but WITHOUT ANY WARRANTY; without even the implied warranty of
 11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 12   Lesser General Public License for more details.
 13
 14   You should have received a copy of the GNU Lesser General Public
 15   License along with the GNU C Library; if not, see
 16   <https://www.gnu.org/licenses/>.  */
 17
 18#ifndef __NETINET_IF_ETHER_H
 19
 20#define __NETINET_IF_ETHER_H	1
 21#include <features.h>
 22#include <sys/types.h>
 23
 24/* Get definitions from kernel header file.  */
 25#include <linux/if_ether.h>
 26
 27#ifdef __USE_MISC
 28/*
 29 * Copyright (c) 1982, 1986, 1993
 30 *	The Regents of the University of California.  All rights reserved.
 31 *
 32 * Redistribution and use in source and binary forms, with or without
 33 * modification, are permitted provided that the following conditions
 34 * are met:
 35 * 1. Redistributions of source code must retain the above copyright
 36 *    notice, this list of conditions and the following disclaimer.
 37 * 2. Redistributions in binary form must reproduce the above copyright
 38 *    notice, this list of conditions and the following disclaimer in the
 39 *    documentation and/or other materials provided with the distribution.
 40 * 4. Neither the name of the University nor the names of its contributors
 41 *    may be used to endorse or promote products derived from this software
 42 *    without specific prior written permission.
 43 *
 44 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 45 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 47 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 48 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 49 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 50 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 51 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 52 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 53 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 54 * SUCH DAMAGE.
 55 *
 56 *	@(#)if_ether.h	8.3 (Berkeley) 5/2/95
 57 *	$FreeBSD$
 58 */
 59
 60#include <net/ethernet.h>
 61#include <net/if_arp.h>
 62
 63__BEGIN_DECLS
 64/*
 65 * Ethernet Address Resolution Protocol.
 66 *
 67 * See RFC 826 for protocol description.  Structure below is adapted
 68 * to resolving internet addresses.  Field names used correspond to
 69 * RFC 826.
 70 */
 71struct	ether_arp {
 72	struct	arphdr ea_hdr;		/* fixed-size header */
 73	uint8_t arp_sha[ETH_ALEN];	/* sender hardware address */
 74	uint8_t arp_spa[4];		/* sender protocol address */
 75	uint8_t arp_tha[ETH_ALEN];	/* target hardware address */
 76	uint8_t arp_tpa[4];		/* target protocol address */
 77};
 78#define	arp_hrd	ea_hdr.ar_hrd
 79#define	arp_pro	ea_hdr.ar_pro
 80#define	arp_hln	ea_hdr.ar_hln
 81#define	arp_pln	ea_hdr.ar_pln
 82#define	arp_op	ea_hdr.ar_op
 83
 84/*
 85 * Macro to map an IP multicast address to an Ethernet multicast address.
 86 * The high-order 25 bits of the Ethernet address are statically assigned,
 87 * and the low-order 23 bits are taken from the low end of the IP address.
 88 */
 89#define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
 90	/* struct in_addr *ipaddr; */ \
 91	/* uint8_t enaddr[ETH_ALEN]; */ \
 92{ \
 93	(enaddr)[0] = 0x01; \
 94	(enaddr)[1] = 0x00; \
 95	(enaddr)[2] = 0x5e; \
 96	(enaddr)[3] = ((uint8_t *)ipaddr)[1] & 0x7f; \
 97	(enaddr)[4] = ((uint8_t *)ipaddr)[2]; \
 98	(enaddr)[5] = ((uint8_t *)ipaddr)[3]; \
 99}
100
101__END_DECLS
102#endif /* __USE_MISC */
103
104#endif /* netinet/if_ether.h */