1 /* $NetBSD: if_arp.h,v 1.44 2026/01/08 15:39:07 nia 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 #include <sys/endian.h> /* ntohs(3) */ 38 39 /* 40 * Address Resolution Protocol. 41 * 42 * See RFC 826 for protocol description. ARP packets are variable 43 * in size; the arphdr structure defines the fixed-length portion. 44 * Protocol type values are the same as those for 10 Mb/s Ethernet. 45 * It is followed by the variable-sized fields ar_sha, arp_spa, 46 * arp_tha and arp_tpa in that order, according to the lengths 47 * specified. Field names used correspond to RFC 826. 48 */ 49 struct arphdr { 50 uint16_t ar_hrd; /* format of hardware address */ 51 #define ARPHRD_ETHER 1 /* ethernet hardware format */ 52 #define ARPHRD_IEEE802 6 /* IEEE 802 hardware format */ 53 #define ARPHRD_ARCNET 7 /* ethernet hardware format */ 54 #define ARPHRD_FRELAY 15 /* frame relay hardware format */ 55 #define ARPHRD_STRIP 23 /* Ricochet Starmode Radio hardware format */ 56 #define ARPHRD_IEEE1394 24 /* IEEE 1394 (FireWire) hardware format */ 57 uint16_t ar_pro; /* format of protocol address */ 58 uint8_t ar_hln; /* length of hardware address */ 59 uint8_t ar_pln; /* length of protocol address */ 60 uint16_t ar_op; /* one of: */ 61 #define ARPOP_REQUEST 1 /* request to resolve address */ 62 #define ARPOP_REPLY 2 /* response to previous request */ 63 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */ 64 #define ARPOP_REVREPLY 4 /* response giving protocol address */ 65 #define ARPOP_INVREQUEST 8 /* request to identify peer */ 66 #define ARPOP_INVREPLY 9 /* response identifying peer */ 67 /* 68 * The remaining fields are variable in size, 69 * according to the sizes above. 70 */ 71 #ifdef COMMENT_ONLY 72 uint8_t ar_sha[]; /* sender hardware address */ 73 uint8_t ar_spa[]; /* sender protocol address */ 74 uint8_t ar_tha[]; /* target hardware address (!IEEE1394) */ 75 uint8_t ar_tpa[]; /* target protocol address */ 76 #endif 77 }; 78 79 static __inline uint8_t * 80 ar_data(struct arphdr *ap) 81 { 82 return (uint8_t *)(void *)(ap + 1); 83 } 84 85 static __inline uint8_t * 86 ar_sha(struct arphdr *ap) 87 { 88 return ar_data(ap) + 0; 89 } 90 91 static __inline uint8_t * 92 ar_spa(struct arphdr *ap) 93 { 94 return ar_data(ap) + ap->ar_hln; 95 } 96 97 static __inline uint8_t * 98 ar_tha(struct arphdr *ap) 99 { 100 if (ntohs(ap->ar_hrd) == ARPHRD_IEEE1394) { 101 return NULL; 102 } else { 103 return ar_data(ap) + ap->ar_hln + ap->ar_pln; 104 } 105 } 106 107 static __inline uint8_t * 108 ar_tpa(struct arphdr *ap) 109 { 110 if (ntohs(ap->ar_hrd) == ARPHRD_IEEE1394) { 111 return ar_data(ap) + ap->ar_hln + ap->ar_pln; 112 } else { 113 return ar_data(ap) + ap->ar_hln + ap->ar_pln + ap->ar_hln; 114 } 115 } 116 117 /* 118 * ARP ioctl request 119 */ 120 struct arpreq { 121 struct sockaddr arp_pa; /* protocol address */ 122 struct sockaddr arp_ha; /* hardware address */ 123 int arp_flags; /* flags */ 124 }; 125 /* arp_flags and at_flags field values */ 126 #define ATF_INUSE 0x01 /* entry in use */ 127 #define ATF_COM 0x02 /* completed entry (enaddr valid) */ 128 #define ATF_PERM 0x04 /* permanent entry */ 129 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */ 130 #define ATF_USETRAILERS 0x10 /* has requested trailers */ 131 132 /* 133 * Kernel statistics about arp 134 */ 135 #define ARP_STAT_SNDTOTAL 0 /* total packets sent */ 136 #define ARP_STAT_SNDREPLY 1 /* replies sent */ 137 #define ARP_STAT_SENDREQUEST 2 /* requests sent */ 138 #define ARP_STAT_RCVTOTAL 3 /* total packets received */ 139 #define ARP_STAT_RCVREQUEST 4 /* valid requests received */ 140 #define ARP_STAT_RCVREPLY 5 /* replies received */ 141 #define ARP_STAT_RCVMCAST 6 /* multicast/broadcast received */ 142 #define ARP_STAT_RCVBADPROTO 7 /* unknown protocol type received */ 143 #define ARP_STAT_RCVBADLEN 8 /* bad (short) length received */ 144 #define ARP_STAT_RCVZEROTPA 9 /* received w/ null target ip */ 145 #define ARP_STAT_RCVZEROSPA 10 /* received w/ null source ip */ 146 #define ARP_STAT_RCVNOINT 11 /* couldn't map to interface */ 147 #define ARP_STAT_RCVLOCALSHA 12 /* received from local hw address */ 148 #define ARP_STAT_RCVBCASTSHA 13 /* received w/ broadcast src */ 149 #define ARP_STAT_RCVLOCALSPA 14 /* received for a local ip [dup!] */ 150 #define ARP_STAT_RCVOVERPERM 15 /* attempts to overwrite static info */ 151 #define ARP_STAT_RCVOVERINT 16 /* attempts to overwrite wrong if */ 152 #define ARP_STAT_RCVOVER 17 /* entries overwritten! */ 153 #define ARP_STAT_RCVLENCHG 18 /* changes in hw address len */ 154 #define ARP_STAT_DFRTOTAL 19 /* deferred pending ARP resolution */ 155 #define ARP_STAT_DFRSENT 20 /* deferred, then sent */ 156 #define ARP_STAT_DFRDROPPED 21 /* deferred, then dropped */ 157 #define ARP_STAT_ALLOCFAIL 22 /* failures to allocate llinfo */ 158 159 #define ARP_NSTATS 23 160 161 void arp_stat_add(int, uint64_t); 162 163 #endif /* !_NET_IF_ARP_H_ */ 164
Indexes created Sat Feb 21 08:20:20 UTC 2026