--- /dev/null
+/*!\file net/if_arp.h
+ * ARP definitions.
+ */
+
+/* $NetBSD: if_arp.h,v 1.12 1997/09/08 02:06:30 mikel Exp $ */
+
+/*
+ * Copyright (c) 1986, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)if_arp.h 8.1 (Berkeley) 6/10/93
+ */
+
+#ifndef __NET_IF_ARP_H
+#define __NET_IF_ARP_H
+/*
+ * Address Resolution Protocol.
+ *
+ * See RFC 826 for protocol description. ARP packets are variable
+ * in size; the arphdr structure defines the fixed-length portion.
+ * Protocol type values are the same as those for 10 Mb/s Ethernet.
+ * It is followed by the variable-sized fields ar_sha, arp_spa,
+ * arp_tha and arp_tpa in that order, according to the lengths
+ * specified. Field names used correspond to RFC 826.
+ */
+
+#include <sys/packon.h>
+
+struct arphdr {
+ u_int16_t ar_hrd; /* format of hardware address */
+#define ARPHRD_ETHER 1 /* ethernet hardware format */
+#define ARPHRD_TOKEN 6 /* TokenRing hardware format */
+#define ARPHRD_ARCNET 7 /* ethernet hardware format */
+#define ARPHRD_FRELAY 15 /* frame relay hardware format */
+#define ARPHRD_STRIP 23 /* Ricochet Starmode Radio hardware format */
+ u_int16_t ar_pro; /* format of protocol address */
+ u_int8_t ar_hln; /* length of hardware address */
+ u_int8_t ar_pln; /* length of protocol address */
+ u_int16_t ar_op; /* one of: */
+#define ARPOP_REQUEST 1 /* request to resolve address */
+#define ARPOP_REPLY 2 /* response to previous request */
+#define ARPOP_REVREQUEST 3 /* request protocol address given hardware */
+#define ARPOP_REVREPLY 4 /* response giving protocol address */
+#define ARPOP_INVREQUEST 8 /* request to identify peer */
+#define ARPOP_INVREPLY 9 /* response identifying peer */
+/*
+ * The remaining fields are variable in size,
+ * according to the sizes above.
+ */
+#ifdef COMMENT_ONLY
+ u_int8_t ar_sha[]; /* sender hardware address */
+ u_int8_t ar_spa[]; /* sender protocol address */
+ u_int8_t ar_tha[]; /* target hardware address */
+ u_int8_t ar_tpa[]; /* target protocol address */
+#endif
+#ifdef __GNUC__ /* only GNU C allows zero arrays */
+ u_int8_t ar_remain[0]; /* minimum size, normally bigger */
+ #define ar_sha(ap) (((ap)->ar_remain)+0)
+ #define ar_spa(ap) (((ap)->ar_remain)+(ap)->ar_hln)
+ #define ar_tha(ap) (((ap)->ar_remain)+(ap)->ar_hln+(ap)->ar_pln)
+ #define ar_tpa(ap) (((ap)->ar_remain)+2*(ap)->ar_hln+(ap)->ar_pln)
+#else
+ #define ar_sha(ap) (((ap)->ar_op)+2)
+ #define ar_spa(ap) (((ap)->ar_op)+2+(ap)->ar_hln)
+ #define ar_tha(ap) (((ap)->ar_op)+2+(ap)->ar_hln+(ap)->ar_pln)
+ #define ar_tpa(ap) (((ap)->ar_op)+2+2*(ap)->ar_hln+(ap)->ar_pln)
+#endif
+};
+
+
+/*
+ * ARP ioctl request
+ */
+struct arpreq {
+ struct sockaddr arp_pa; /* protocol address */
+ struct sockaddr arp_ha; /* hardware address */
+ int arp_flags; /* flags */
+};
+
+#include <sys/packoff.h>
+
+/* arp_flags and at_flags field values */
+#define ATF_INUSE 0x01 /* entry in use */
+#define ATF_COM 0x02 /* completed entry (enaddr valid) */
+#define ATF_PERM 0x04 /* permanent entry */
+#define ATF_PUBL 0x08 /* publish entry (respond for other host) */
+#define ATF_USETRAILERS 0x10 /* has requested trailers */
+
+#endif
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