1 /* $NetBSD: if_arp.h,v 1.22 2001/06/12 15:17:27 wiz Exp $ */ 2 3 /* 4 * Copyright (c) 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)if_arp.h 8.1 (Berkeley) 6/10/93 36 */ 37 38 #ifndef _NET_IF_ARP_H_ 39 #define _NET_IF_ARP_H_ 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_int16_t ar_hrd; /* format of hardware address */ 52 #define ARPHRD_ETHER 1 /* ethernet hardware format */ 53 #define ARPHRD_IEEE802 6 /* IEEE 802 hardware format */ 54 #define ARPHRD_ARCNET 7 /* ethernet hardware format */ 55 #define ARPHRD_FRELAY 15 /* frame relay hardware format */ 56 #define ARPHRD_STRIP 23 /* Ricochet Starmode Radio hardware format */ 57 #define ARPHRD_IEEE1394 24 /* IEEE 1394 (FireWire) hardware format */ 58 u_int16_t ar_pro; /* format of protocol address */ 59 u_int8_t ar_hln; /* length of hardware address */ 60 u_int8_t ar_pln; /* length of protocol address */ 61 u_int16_t ar_op; /* one of: */ 62 #define ARPOP_REQUEST 1 /* request to resolve address */ 63 #define ARPOP_REPLY 2 /* response to previous request */ 64 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */ 65 #define ARPOP_REVREPLY 4 /* response giving protocol address */ 66 #define ARPOP_INVREQUEST 8 /* request to identify peer */ 67 #define ARPOP_INVREPLY 9 /* response identifying peer */ 68 /* 69 * The remaining fields are variable in size, 70 * according to the sizes above. 71 */ 72 #ifdef COMMENT_ONLY 73 u_int8_t ar_sha[]; /* sender hardware address */ 74 u_int8_t ar_spa[]; /* sender protocol address */ 75 u_int8_t ar_tha[]; /* target hardware address */ 76 u_int8_t ar_tpa[]; /* target protocol address */ 77 #endif 78 #define ar_sha(ap) (((caddr_t)((ap)+1))+0) 79 #define ar_spa(ap) (((caddr_t)((ap)+1))+ (ap)->ar_hln) 80 #define ar_tha(ap) (((caddr_t)((ap)+1))+ (ap)->ar_hln+(ap)->ar_pln) 81 #define ar_tpa(ap) (((caddr_t)((ap)+1))+2*(ap)->ar_hln+(ap)->ar_pln) 82 } __attribute__((__packed__)); 83 84 85 /* 86 * ARP ioctl request 87 */ 88 struct arpreq { 89 struct sockaddr arp_pa; /* protocol address */ 90 struct sockaddr arp_ha; /* hardware address */ 91 int arp_flags; /* flags */ 92 }; 93 /* arp_flags and at_flags field values */ 94 #define ATF_INUSE 0x01 /* entry in use */ 95 #define ATF_COM 0x02 /* completed entry (enaddr valid) */ 96 #define ATF_PERM 0x04 /* permanent entry */ 97 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */ 98 #define ATF_USETRAILERS 0x10 /* has requested trailers */ 99 100 /* 101 * Kernel statistics about arp 102 */ 103 struct arpstat { 104 u_quad_t as_sndtotal; /* total packets sent */ 105 u_quad_t as_sndreply; /* replies sent */ 106 u_quad_t as_sndrequest; /* requests sent */ 107 108 u_quad_t as_rcvtotal; /* total packets received */ 109 u_quad_t as_rcvrequest; /* valid requests received */ 110 u_quad_t as_rcvreply; /* replies received */ 111 u_quad_t as_rcvmcast; /* multicast/broadcast received */ 112 u_quad_t as_rcvbadproto; /* unknown protocol type received */ 113 u_quad_t as_rcvbadlen; /* bad (short) length received */ 114 u_quad_t as_rcvzerotpa; /* received w/ null target ip */ 115 u_quad_t as_rcvzerospa; /* received w/ null src ip */ 116 u_quad_t as_rcvnoint; /* couldn't map to interface */ 117 u_quad_t as_rcvlocalsha; /* received from local hw address */ 118 u_quad_t as_rcvbcastsha; /* received w/ broadcast src */ 119 u_quad_t as_rcvlocalspa; /* received for a local ip [dup!] */ 120 u_quad_t as_rcvoverperm; /* attempts to overwrite static info */ 121 u_quad_t as_rcvoverint; /* attempts to overwrite wrong if */ 122 u_quad_t as_rcvover; /* entries overwritten! */ 123 u_quad_t as_rcvlenchg; /* changes in hw add len */ 124 125 u_quad_t as_dfrtotal; /* deferred pending ARP resolution. */ 126 u_quad_t as_dfrsent; /* deferred, then sent */ 127 u_quad_t as_dfrdropped; /* deferred, then dropped */ 128 129 u_quad_t as_allocfail; /* Failures to allocate llinfo */ 130 }; 131 132 #endif /* _NET_IF_ARP_H_ */ 133