| 1 | /* $NetBSD: if_arp.h,v 1.30 2015/08/31 08:05:20 ozaki-r 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 | uint16_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 | uint16_t ar_pro; /* format of protocol address */ |
| 55 | uint8_t ar_hln; /* length of hardware address */ |
| 56 | uint8_t ar_pln; /* length of protocol address */ |
| 57 | uint16_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 | uint8_t ar_sha[]; /* sender hardware address */ |
| 70 | uint8_t ar_spa[]; /* sender protocol address */ |
| 71 | uint8_t ar_tha[]; /* target hardware address */ |
| 72 | uint8_t ar_tpa[]; /* target protocol address */ |
| 73 | #endif |
| 74 | #define ar_sha(ap) (((char *)((ap)+1))+0) |
| 75 | #define ar_spa(ap) (((char *)((ap)+1))+(ap)->ar_hln) |
| 76 | #define ar_tha(ap) \ |
| 77 | (ntohs((ap)->ar_hrd) == ARPHRD_IEEE1394 \ |
| 78 | ? NULL : (((char *)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln)) |
| 79 | #define ar_tpa(ap) \ |
| 80 | (ntohs((ap)->ar_hrd) == ARPHRD_IEEE1394 \ |
| 81 | ? (((char *)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln) \ |
| 82 | : (((char *)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln+(ap)->ar_hln)) |
| 83 | } __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 | #define ARP_STAT_SNDTOTAL 0 /* total packets sent */ |
| 105 | #define ARP_STAT_SNDREPLY 1 /* replies sent */ |
| 106 | #define ARP_STAT_SENDREQUEST 2 /* requests sent */ |
| 107 | #define ARP_STAT_RCVTOTAL 3 /* total packets received */ |
| 108 | #define ARP_STAT_RCVREQUEST 4 /* valid requests received */ |
| 109 | #define ARP_STAT_RCVREPLY 5 /* replies received */ |
| 110 | #define ARP_STAT_RCVMCAST 6 /* multicast/broadcast received */ |
| 111 | #define ARP_STAT_RCVBADPROTO 7 /* unknown protocol type received */ |
| 112 | #define ARP_STAT_RCVBADLEN 8 /* bad (short) length received */ |
| 113 | #define ARP_STAT_RCVZEROTPA 9 /* received w/ null target ip */ |
| 114 | #define ARP_STAT_RCVZEROSPA 10 /* received w/ null source ip */ |
| 115 | #define ARP_STAT_RCVNOINT 11 /* couldn't map to interface */ |
| 116 | #define ARP_STAT_RCVLOCALSHA 12 /* received from local hw address */ |
| 117 | #define ARP_STAT_RCVBCASTSHA 13 /* received w/ broadcast src */ |
| 118 | #define ARP_STAT_RCVLOCALSPA 14 /* received for a local ip [dup!] */ |
| 119 | #define ARP_STAT_RCVOVERPERM 15 /* attempts to overwrite static info */ |
| 120 | #define ARP_STAT_RCVOVERINT 16 /* attempts to overwrite wrong if */ |
| 121 | #define ARP_STAT_RCVOVER 17 /* entries overwritten! */ |
| 122 | #define ARP_STAT_RCVLENCHG 18 /* changes in hw address len */ |
| 123 | #define ARP_STAT_DFRTOTAL 19 /* deferred pending ARP resolution */ |
| 124 | #define ARP_STAT_DFRSENT 20 /* deferred, then sent */ |
| 125 | #define ARP_STAT_DFRDROPPED 21 /* deferred, then dropped */ |
| 126 | #define ARP_STAT_ALLOCFAIL 22 /* failures to allocate llinfo */ |
| 127 | |
| 128 | #define ARP_NSTATS 23 |
| 129 | |
| 130 | void arp_stat_add(int, uint64_t); |
| 131 | |
| 132 | #endif /* !_NET_IF_ARP_H_ */ |
| 133 | |