1 /* 2 * Copyright (c) 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)if_arp.h 8.1 (Berkeley) 6/10/93 34 * $Id: if_arp.h,v 1.4 1994/11/15 14:41:38 bde Exp $ 35 */ 36 37 #ifndef _NET_IF_ARP_H_ 38 #define _NET_IF_ARP_H_ 39 40 #include <sys/socket.h> /* for struct sockaddr */ 41 42 /* 43 * Address Resolution Protocol. 44 * 45 * See RFC 826 for protocol description. ARP packets are variable 46 * in size; the arphdr structure defines the fixed-length portion. 47 * Protocol type values are the same as those for 10 Mb/s Ethernet. 48 * It is followed by the variable-sized fields ar_sha, arp_spa, 49 * arp_tha and arp_tpa in that order, according to the lengths 50 * specified. Field names used correspond to RFC 826. 51 */ 52 struct arphdr { 53 u_short ar_hrd; /* format of hardware address */ 54 #define ARPHRD_ETHER 1 /* ethernet hardware format */ 55 #define ARPHRD_FRELAY 15 /* frame relay hardware format */ 56 u_short ar_pro; /* format of protocol address */ 57 u_char ar_hln; /* length of hardware address */ 58 u_char ar_pln; /* length of protocol address */ 59 u_short ar_op; /* one of: */ 60 #define ARPOP_REQUEST 1 /* request to resolve address */ 61 #define ARPOP_REPLY 2 /* response to previous request */ 62 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */ 63 #define ARPOP_REVREPLY 4 /* response giving protocol address */ 64 #define ARPOP_INVREQUEST 8 /* request to identify peer */ 65 #define ARPOP_INVREPLY 9 /* response identifying peer */ 66 /* 67 * The remaining fields are variable in size, 68 * according to the sizes above. 69 */ 70 #ifdef COMMENT_ONLY 71 u_char ar_sha[]; /* sender hardware address */ 72 u_char ar_spa[]; /* sender protocol address */ 73 u_char ar_tha[]; /* target hardware address */ 74 u_char ar_tpa[]; /* target protocol address */ 75 #endif 76 }; 77 78 /* 79 * ARP ioctl request 80 */ 81 struct arpreq { 82 struct sockaddr arp_pa; /* protocol address */ 83 struct sockaddr arp_ha; /* hardware address */ 84 int arp_flags; /* flags */ 85 }; 86 /* arp_flags and at_flags field values */ 87 #define ATF_INUSE 0x01 /* entry in use */ 88 #define ATF_COM 0x02 /* completed entry (enaddr valid) */ 89 #define ATF_PERM 0x04 /* permanent entry */ 90 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */ 91 #define ATF_USETRAILERS 0x10 /* has requested trailers */ 92 93 #endif /* !_NET_IF_ARP_H_ */ 94