if_arp.h revision 152315
1/*- 2 * Copyright (c) 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if_arp.h 8.1 (Berkeley) 6/10/93 30 * $FreeBSD: head/sys/net/if_arp.h 152315 2005-11-11 16:04:59Z ru $ 31 */ 32 33#ifndef _NET_IF_ARP_H_ 34#define _NET_IF_ARP_H_ 35 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 */ 46struct arphdr { 47 u_short ar_hrd; /* format of hardware address */ 48#define ARPHRD_ETHER 1 /* ethernet hardware format */ 49#define ARPHRD_IEEE802 6 /* token-ring hardware format */ 50#define ARPHRD_ARCNET 7 /* arcnet hardware format */ 51#define ARPHRD_FRELAY 15 /* frame relay hardware format */ 52#define ARPHRD_IEEE1394 24 /* firewire hardware format */ 53 u_short ar_pro; /* format of protocol address */ 54 u_char ar_hln; /* length of hardware address */ 55 u_char ar_pln; /* length of protocol address */ 56 u_short ar_op; /* one of: */ 57#define ARPOP_REQUEST 1 /* request to resolve address */ 58#define ARPOP_REPLY 2 /* response to previous request */ 59#define ARPOP_REVREQUEST 3 /* request protocol address given hardware */ 60#define ARPOP_REVREPLY 4 /* response giving protocol address */ 61#define ARPOP_INVREQUEST 8 /* request to identify peer */ 62#define ARPOP_INVREPLY 9 /* response identifying peer */ 63/* 64 * The remaining fields are variable in size, 65 * according to the sizes above. 66 */ 67#ifdef COMMENT_ONLY 68 u_char ar_sha[]; /* sender hardware address */ 69 u_char ar_spa[]; /* sender protocol address */ 70 u_char ar_tha[]; /* target hardware address */ 71 u_char ar_tpa[]; /* target protocol address */ 72#endif 73}; 74 75#define ar_sha(ap) (((caddr_t)((ap)+1)) + 0) 76#define ar_spa(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln) 77#define ar_tha(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln + (ap)->ar_pln) 78#define ar_tpa(ap) (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln) 79 80#define arphdr_len2(ar_hln, ar_pln) \ 81 (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln)) 82#define arphdr_len(ap) (arphdr_len2((ap)->ar_hln, (ap)->ar_pln)) 83 84/* 85 * ARP ioctl request 86 */ 87struct arpreq { 88 struct sockaddr arp_pa; /* protocol address */ 89 struct sockaddr arp_ha; /* hardware address */ 90 int arp_flags; /* flags */ 91}; 92/* arp_flags and at_flags field values */ 93#define ATF_INUSE 0x01 /* entry in use */ 94#define ATF_COM 0x02 /* completed entry (enaddr valid) */ 95#define ATF_PERM 0x04 /* permanent entry */ 96#define ATF_PUBL 0x08 /* publish entry (respond for other host) */ 97#define ATF_USETRAILERS 0x10 /* has requested trailers */ 98 99#ifdef _KERNEL 100/* 101 * Structure shared between the ethernet driver modules and 102 * the address resolution code. 103 */ 104struct arpcom { 105 struct ifnet *ac_ifp; /* network-visible interface */ 106 void *ac_netgraph; /* ng_ether(4) netgraph node info */ 107}; 108#define IFP2AC(ifp) ((struct arpcom *)(ifp->if_l2com)) 109#define AC2IFP(ac) ((ac)->ac_ifp) 110 111#endif 112 113#endif /* !_NET_IF_ARP_H_ */ 114