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 * $FreeBSD$ 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 */ 46 struct 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 u_short ar_pro; /* format of protocol address */ 53 u_char ar_hln; /* length of hardware address */ 54 u_char ar_pln; /* length of protocol address */ 55 u_short ar_op; /* one of: */ 56 #define ARPOP_REQUEST 1 /* request to resolve address */ 57 #define ARPOP_REPLY 2 /* response to previous request */ 58 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */ 59 #define ARPOP_REVREPLY 4 /* response giving protocol address */ 60 #define ARPOP_INVREQUEST 8 /* request to identify peer */ 61 #define ARPOP_INVREPLY 9 /* response identifying peer */ 62 /* 63 * The remaining fields are variable in size, 64 * according to the sizes above. 65 */ 66 #ifdef COMMENT_ONLY 67 u_char ar_sha[]; /* sender hardware address */ 68 u_char ar_spa[]; /* sender protocol address */ 69 u_char ar_tha[]; /* target hardware address */ 70 u_char ar_tpa[]; /* target protocol address */ 71 #endif 72 }; 73 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) (((caddr_t)((ap)+1)) + (ap)->ar_hln + (ap)->ar_pln) 77 #define ar_tpa(ap) (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln) 78 79 #define arphdr_len2(ar_hln, ar_pln) \ 80 (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln)) 81 #define arphdr_len(ap) (arphdr_len2((ap)->ar_hln, (ap)->ar_pln)) 82 83 /* 84 * ARP ioctl request 85 */ 86 struct arpreq { 87 struct sockaddr arp_pa; /* protocol address */ 88 struct sockaddr arp_ha; /* hardware address */ 89 int arp_flags; /* flags */ 90 }; 91 /* arp_flags and at_flags field values */ 92 #define ATF_INUSE 0x01 /* entry in use */ 93 #define ATF_COM 0x02 /* completed entry (enaddr valid) */ 94 #define ATF_PERM 0x04 /* permanent entry */ 95 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */ 96 #define ATF_USETRAILERS 0x10 /* has requested trailers */ 97 98 #ifdef _KERNEL 99 /* 100 * Structure shared between the ethernet driver modules and 101 * the address resolution code. For example, each ec_softc or il_softc 102 * begins with this structure. 103 * The code is written so that each *_softc _must_ begin with a 104 * struct arpcom, which in turn _must_ begin with a struct ifnet. 105 */ 106 struct arpcom { 107 /* 108 * The ifnet struct _must_ be at the head of this structure. 109 */ 110 struct ifnet ac_if; /* network-visible interface */ 111 u_char ac_enaddr[6]; /* ethernet hardware address */ 112 int now_unused; /* XXX was length of ac_multiaddrs list */ 113 void *ac_netgraph; /* ng_ether(4) netgraph node info */ 114 }; 115 #define IFP2AC(ifp) ((struct arpcom *)(ifp)) 116 117 #endif 118 119 #endif /* !_NET_IF_ARP_H_ */ 120