1 /* $NetBSD: if_arp.h,v 1.24 2003/08/07 16:32:50 agc 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)if_arp.h 8.1 (Berkeley) 6/10/93 32 */ 33 34 #ifndef _NET_IF_ARP_H_ 35 #define _NET_IF_ARP_H_ 36 /* 37 * Address Resolution Protocol. 38 * 39 * See RFC 826 for protocol description. ARP packets are variable 40 * in size; the arphdr structure defines the fixed-length portion. 41 * Protocol type values are the same as those for 10 Mb/s Ethernet. 42 * It is followed by the variable-sized fields ar_sha, arp_spa, 43 * arp_tha and arp_tpa in that order, according to the lengths 44 * specified. Field names used correspond to RFC 826. 45 */ 46 struct arphdr { 47 u_int16_t ar_hrd; /* format of hardware address */ 48 #define ARPHRD_ETHER 1 /* ethernet hardware format */ 49 #define ARPHRD_IEEE802 6 /* IEEE 802 hardware format */ 50 #define ARPHRD_ARCNET 7 /* ethernet hardware format */ 51 #define ARPHRD_FRELAY 15 /* frame relay hardware format */ 52 #define ARPHRD_STRIP 23 /* Ricochet Starmode Radio hardware format */ 53 #define ARPHRD_IEEE1394 24 /* IEEE 1394 (FireWire) hardware format */ 54 u_int16_t ar_pro; /* format of protocol address */ 55 u_int8_t ar_hln; /* length of hardware address */ 56 u_int8_t ar_pln; /* length of protocol address */ 57 u_int16_t ar_op; /* one of: */ 58 #define ARPOP_REQUEST 1 /* request to resolve address */ 59 #define ARPOP_REPLY 2 /* response to previous request */ 60 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */ 61 #define ARPOP_REVREPLY 4 /* response giving protocol address */ 62 #define ARPOP_INVREQUEST 8 /* request to identify peer */ 63 #define ARPOP_INVREPLY 9 /* response identifying peer */ 64 /* 65 * The remaining fields are variable in size, 66 * according to the sizes above. 67 */ 68 #ifdef COMMENT_ONLY 69 u_int8_t ar_sha[]; /* sender hardware address */ 70 u_int8_t ar_spa[]; /* sender protocol address */ 71 u_int8_t ar_tha[]; /* target hardware address */ 72 u_int8_t ar_tpa[]; /* target protocol address */ 73 #endif 74 #define ar_sha(ap) (((caddr_t)((ap)+1))+0) 75 #define ar_spa(ap) (((caddr_t)((ap)+1))+(ap)->ar_hln) 76 #define ar_tha(ap) \ 77 (ntohs((ap)->ar_hrd) == ARPHRD_IEEE1394 \ 78 ? NULL : (((caddr_t)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln)) 79 #define ar_tpa(ap) \ 80 (ntohs((ap)->ar_hrd) == ARPHRD_IEEE1394 \ 81 ? (((caddr_t)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln) \ 82 : (((caddr_t)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln+(ap)->ar_hln)) 83 } __attribute__((__packed__)); 84 85 86 /* 87 * ARP ioctl request 88 */ 89 struct arpreq { 90 struct sockaddr arp_pa; /* protocol address */ 91 struct sockaddr arp_ha; /* hardware address */ 92 int arp_flags; /* flags */ 93 }; 94 /* arp_flags and at_flags field values */ 95 #define ATF_INUSE 0x01 /* entry in use */ 96 #define ATF_COM 0x02 /* completed entry (enaddr valid) */ 97 #define ATF_PERM 0x04 /* permanent entry */ 98 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */ 99 #define ATF_USETRAILERS 0x10 /* has requested trailers */ 100 101 /* 102 * Kernel statistics about arp 103 */ 104 struct arpstat { 105 u_quad_t as_sndtotal; /* total packets sent */ 106 u_quad_t as_sndreply; /* replies sent */ 107 u_quad_t as_sndrequest; /* requests sent */ 108 109 u_quad_t as_rcvtotal; /* total packets received */ 110 u_quad_t as_rcvrequest; /* valid requests received */ 111 u_quad_t as_rcvreply; /* replies received */ 112 u_quad_t as_rcvmcast; /* multicast/broadcast received */ 113 u_quad_t as_rcvbadproto; /* unknown protocol type received */ 114 u_quad_t as_rcvbadlen; /* bad (short) length received */ 115 u_quad_t as_rcvzerotpa; /* received w/ null target ip */ 116 u_quad_t as_rcvzerospa; /* received w/ null src ip */ 117 u_quad_t as_rcvnoint; /* couldn't map to interface */ 118 u_quad_t as_rcvlocalsha; /* received from local hw address */ 119 u_quad_t as_rcvbcastsha; /* received w/ broadcast src */ 120 u_quad_t as_rcvlocalspa; /* received for a local ip [dup!] */ 121 u_quad_t as_rcvoverperm; /* attempts to overwrite static info */ 122 u_quad_t as_rcvoverint; /* attempts to overwrite wrong if */ 123 u_quad_t as_rcvover; /* entries overwritten! */ 124 u_quad_t as_rcvlenchg; /* changes in hw add len */ 125 126 u_quad_t as_dfrtotal; /* deferred pending ARP resolution. */ 127 u_quad_t as_dfrsent; /* deferred, then sent */ 128 u_quad_t as_dfrdropped; /* deferred, then dropped */ 129 130 u_quad_t as_allocfail; /* Failures to allocate llinfo */ 131 }; 132 133 #endif /* _NET_IF_ARP_H_ */ 134