/* $NetBSD: if_arp.h,v 1.44 2026/01/08 15:39:07 nia Exp $ */ /* * Copyright (c) 1986, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)if_arp.h 8.1 (Berkeley) 6/10/93 */ #ifndef _NET_IF_ARP_H_ #define _NET_IF_ARP_H_ #include <sys/endian.h> /* ntohs(3) */ /* * Address Resolution Protocol. * * See RFC 826 for protocol description. ARP packets are variable * in size; the arphdr structure defines the fixed-length portion. * Protocol type values are the same as those for 10 Mb/s Ethernet. * It is followed by the variable-sized fields ar_sha, arp_spa, * arp_tha and arp_tpa in that order, according to the lengths * specified. Field names used correspond to RFC 826. */ struct arphdr { uint16_t ar_hrd; /* format of hardware address */ #define ARPHRD_ETHER 1 /* ethernet hardware format */ #define ARPHRD_IEEE802 6 /* IEEE 802 hardware format */ #define ARPHRD_ARCNET 7 /* ethernet hardware format */ #define ARPHRD_FRELAY 15 /* frame relay hardware format */ #define ARPHRD_STRIP 23 /* Ricochet Starmode Radio hardware format */ #define ARPHRD_IEEE1394 24 /* IEEE 1394 (FireWire) hardware format */ uint16_t ar_pro; /* format of protocol address */ uint8_t ar_hln; /* length of hardware address */ uint8_t ar_pln; /* length of protocol address */ uint16_t ar_op; /* one of: */ #define ARPOP_REQUEST 1 /* request to resolve address */ #define ARPOP_REPLY 2 /* response to previous request */ #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */ #define ARPOP_REVREPLY 4 /* response giving protocol address */ #define ARPOP_INVREQUEST 8 /* request to identify peer */ #define ARPOP_INVREPLY 9 /* response identifying peer */ /* * The remaining fields are variable in size, * according to the sizes above. */ #ifdef COMMENT_ONLY uint8_t ar_sha[]; /* sender hardware address */ uint8_t ar_spa[]; /* sender protocol address */ uint8_t ar_tha[]; /* target hardware address (!IEEE1394) */ uint8_t ar_tpa[]; /* target protocol address */ #endif }; static __inline uint8_t * ar_data(struct arphdr *ap) { return (uint8_t *)(void *)(ap + 1); } static __inline uint8_t * ar_sha(struct arphdr *ap) { return ar_data(ap) + 0; } static __inline uint8_t * ar_spa(struct arphdr *ap) { return ar_data(ap) + ap->ar_hln; } static __inline uint8_t * ar_tha(struct arphdr *ap) { if (ntohs(ap->ar_hrd) == ARPHRD_IEEE1394) { return NULL; } else { return ar_data(ap) + ap->ar_hln + ap->ar_pln; } } static __inline uint8_t * ar_tpa(struct arphdr *ap) { if (ntohs(ap->ar_hrd) == ARPHRD_IEEE1394) { return ar_data(ap) + ap->ar_hln + ap->ar_pln; } else { return ar_data(ap) + ap->ar_hln + ap->ar_pln + ap->ar_hln; } } /* * ARP ioctl request */ struct arpreq { struct sockaddr arp_pa; /* protocol address */ struct sockaddr arp_ha; /* hardware address */ int arp_flags; /* flags */ }; /* arp_flags and at_flags field values */ #define ATF_INUSE 0x01 /* entry in use */ #define ATF_COM 0x02 /* completed entry (enaddr valid) */ #define ATF_PERM 0x04 /* permanent entry */ #define ATF_PUBL 0x08 /* publish entry (respond for other host) */ #define ATF_USETRAILERS 0x10 /* has requested trailers */ /* * Kernel statistics about arp */ #define ARP_STAT_SNDTOTAL 0 /* total packets sent */ #define ARP_STAT_SNDREPLY 1 /* replies sent */ #define ARP_STAT_SENDREQUEST 2 /* requests sent */ #define ARP_STAT_RCVTOTAL 3 /* total packets received */ #define ARP_STAT_RCVREQUEST 4 /* valid requests received */ #define ARP_STAT_RCVREPLY 5 /* replies received */ #define ARP_STAT_RCVMCAST 6 /* multicast/broadcast received */ #define ARP_STAT_RCVBADPROTO 7 /* unknown protocol type received */ #define ARP_STAT_RCVBADLEN 8 /* bad (short) length received */ #define ARP_STAT_RCVZEROTPA 9 /* received w/ null target ip */ #define ARP_STAT_RCVZEROSPA 10 /* received w/ null source ip */ #define ARP_STAT_RCVNOINT 11 /* couldn't map to interface */ #define ARP_STAT_RCVLOCALSHA 12 /* received from local hw address */ #define ARP_STAT_RCVBCASTSHA 13 /* received w/ broadcast src */ #define ARP_STAT_RCVLOCALSPA 14 /* received for a local ip [dup!] */ #define ARP_STAT_RCVOVERPERM 15 /* attempts to overwrite static info */ #define ARP_STAT_RCVOVERINT 16 /* attempts to overwrite wrong if */ #define ARP_STAT_RCVOVER 17 /* entries overwritten! */ #define ARP_STAT_RCVLENCHG 18 /* changes in hw address len */ #define ARP_STAT_DFRTOTAL 19 /* deferred pending ARP resolution */ #define ARP_STAT_DFRSENT 20 /* deferred, then sent */ #define ARP_STAT_DFRDROPPED 21 /* deferred, then dropped */ #define ARP_STAT_ALLOCFAIL 22 /* failures to allocate llinfo */ #define ARP_NSTATS 23 void arp_stat_add(int, uint64_t); #endif /* !_NET_IF_ARP_H_ */
