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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)if_arp.h 8.1 (Berkeley) 6/10/93 34 * $FreeBSD: src/sys/net/if_arp.h,v 1.14.2.3 2002/02/20 23:34:09 fjoe Exp $ 35 * $DragonFly: src/sys/net/if_arp.h,v 1.8 2006/07/31 12:17:39 corecode Exp $ 36 */ 37 38 #ifndef _NET_IF_ARP_H_ 39 #define _NET_IF_ARP_H_ 40 41 #ifndef _SYS_TYPES_H_ 42 #include <sys/types.h> 43 #endif 44 #ifndef _SYS_SOCKET_H_ 45 #include <sys/socket.h> 46 #endif 47 48 /* 49 * Address Resolution Protocol. 50 * 51 * See RFC 826 for protocol description. ARP packets are variable 52 * in size; the arphdr structure defines the fixed-length portion. 53 * Protocol type values are the same as those for 10 Mb/s Ethernet. 54 * It is followed by the variable-sized fields ar_sha, arp_spa, 55 * arp_tha and arp_tpa in that order, according to the lengths 56 * specified. Field names used correspond to RFC 826. 57 */ 58 struct arphdr { 59 u_short ar_hrd; /* format of hardware address */ 60 #define ARPHRD_ETHER 1 /* ethernet hardware format */ 61 #define ARPHRD_IEEE802 6 /* token-ring hardware format */ 62 #define ARPHRD_ARCNET 7 /* arcnet hardware format */ 63 #define ARPHRD_FRELAY 15 /* frame relay hardware format */ 64 u_short ar_pro; /* format of protocol address */ 65 u_char ar_hln; /* length of hardware address */ 66 u_char ar_pln; /* length of protocol address */ 67 u_short ar_op; /* one of: */ 68 #define ARPOP_REQUEST 1 /* request to resolve address */ 69 #define ARPOP_REPLY 2 /* response to previous request */ 70 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */ 71 #define ARPOP_REVREPLY 4 /* response giving protocol address */ 72 #define ARPOP_INVREQUEST 8 /* request to identify peer */ 73 #define ARPOP_INVREPLY 9 /* response identifying peer */ 74 /* 75 * The remaining fields are variable in size, 76 * according to the sizes above. 77 */ 78 #ifdef COMMENT_ONLY 79 u_char ar_sha[]; /* sender hardware address */ 80 u_char ar_spa[]; /* sender protocol address */ 81 u_char ar_tha[]; /* target hardware address */ 82 u_char ar_tpa[]; /* target protocol address */ 83 #endif 84 }; 85 86 #define ar_sha(ap) (((caddr_t)((ap)+1)) + 0) 87 #define ar_spa(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln) 88 #define ar_tha(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln + (ap)->ar_pln) 89 #define ar_tpa(ap) (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln) 90 91 #define arphdr_len2(ar_hln, ar_pln) \ 92 (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln)) 93 #define arphdr_len(ap) (arphdr_len2((ap)->ar_hln, (ap)->ar_pln)) 94 95 /* 96 * ARP ioctl request 97 */ 98 struct arpreq { 99 struct sockaddr arp_pa; /* protocol address */ 100 struct sockaddr arp_ha; /* hardware address */ 101 int arp_flags; /* flags */ 102 }; 103 /* arp_flags and at_flags field values */ 104 #define ATF_INUSE 0x01 /* entry in use */ 105 #define ATF_COM 0x02 /* completed entry (enaddr valid) */ 106 #define ATF_PERM 0x04 /* permanent entry */ 107 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */ 108 #define ATF_USETRAILERS 0x10 /* has requested trailers */ 109 110 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 111 #ifndef _NET_IF_VAR_H_ 112 #include <net/if_var.h> 113 #endif 114 115 /* 116 * Structure shared between the ethernet driver modules and 117 * the address resolution code. For example, each ec_softc or il_softc 118 * begins with this structure. 119 */ 120 struct arpcom { 121 /* 122 * The ifnet struct _must_ be at the head of this structure. 123 */ 124 struct ifnet ac_if; /* network-visible interface */ 125 u_char ac_enaddr[6]; /* ethernet hardware address */ 126 int ac_multicnt; /* length of ac_multiaddrs list */ 127 void *ac_netgraph; /* ng_ether(4) netgraph node info */ 128 }; 129 130 #endif 131 132 #endif /* !_NET_IF_ARP_H_ */ 133