1 /* 2 * Copyright (c) 1986 Regents of the University of California. 3 * 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 * from: @(#)if_arp.h 7.4 (Berkeley) 6/28/90 34 * $Id: if_arp.h,v 1.5 1993/09/05 00:46:54 cassidy Exp $ 35 */ 36 37 #ifndef _NET_IF_ARP_H_ 38 #define _NET_IF_ARP_H_ 39 40 /* 41 * Address Resolution Protocol. 42 * 43 * See RFC 826 for protocol description. ARP packets are variable 44 * in size; the arphdr structure defines the fixed-length portion. 45 * Protocol type values are the same as those for 10 Mb/s Ethernet. 46 * It is followed by the variable-sized fields ar_sha, arp_spa, 47 * arp_tha and arp_tpa in that order, according to the lengths 48 * specified. Field names used correspond to RFC 826. 49 */ 50 struct arphdr { 51 u_short ar_hrd; /* format of hardware address */ 52 #define ARPHRD_ETHER 1 /* ethernet hardware address */ 53 u_short ar_pro; /* format of protocol address */ 54 u_char ar_hln; /* length of hardware address */ 55 u_char ar_pln; /* length of protocol address */ 56 u_short ar_op; /* one of: */ 57 #define ARPOP_REQUEST 1 /* request to resolve address */ 58 #define ARPOP_REPLY 2 /* response to previous request */ 59 #define REVARP_REQUEST 3 /* reverse ARP request */ 60 #define REVARP_REPLY 4 /* reverse ARP reply */ 61 /* 62 * The remaining fields are variable in size, 63 * according to the sizes above. 64 */ 65 /* u_char ar_sha[]; * sender hardware address */ 66 /* u_char ar_spa[]; * sender protocol address */ 67 /* u_char ar_tha[]; * target hardware address */ 68 /* u_char ar_tpa[]; * target protocol address */ 69 }; 70 71 /* 72 * ARP ioctl request 73 */ 74 struct arpreq { 75 struct sockaddr arp_pa; /* protocol address */ 76 struct sockaddr arp_ha; /* hardware address */ 77 int arp_flags; /* flags */ 78 }; 79 /* arp_flags and at_flags field values */ 80 #define ATF_INUSE 0x01 /* entry in use */ 81 #define ATF_COM 0x02 /* completed entry (enaddr valid) */ 82 #define ATF_PERM 0x04 /* permanent entry */ 83 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */ 84 #define ATF_USETRAILERS 0x10 /* has requested trailers */ 85 86 #endif /* !_NET_IF_ARP_H_ */ 87