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. 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: src/sys/net/if_arp.h,v 1.14.2.3 2002/02/20 23:34:09 fjoe Exp $ 31 * $DragonFly: src/sys/net/if_arp.h,v 1.9 2008/11/24 12:19:14 hasso Exp $ 32 */ 33 34 #ifndef _NET_IF_ARP_H_ 35 #define _NET_IF_ARP_H_ 36 37 #ifndef _SYS_TYPES_H_ 38 #include <sys/types.h> 39 #endif 40 #ifndef _SYS_SOCKET_H_ 41 #include <sys/socket.h> 42 #endif 43 44 /* 45 * Address Resolution Protocol. 46 * 47 * See RFC 826 for protocol description. ARP packets are variable 48 * in size; the arphdr structure defines the fixed-length portion. 49 * Protocol type values are the same as those for 10 Mb/s Ethernet. 50 * It is followed by the variable-sized fields ar_sha, arp_spa, 51 * arp_tha and arp_tpa in that order, according to the lengths 52 * specified. Field names used correspond to RFC 826. 53 */ 54 struct arphdr { 55 u_short ar_hrd; /* format of hardware address */ 56 #define ARPHRD_ETHER 1 /* ethernet hardware format */ 57 #define ARPHRD_IEEE802 6 /* token-ring hardware format */ 58 #define ARPHRD_ARCNET 7 /* arcnet hardware format */ 59 #define ARPHRD_FRELAY 15 /* frame relay hardware format */ 60 #define ARPHRD_IEEE1394 24 /* firewire hardware format */ 61 u_short ar_pro; /* format of protocol address */ 62 u_char ar_hln; /* length of hardware address */ 63 u_char ar_pln; /* length of protocol address */ 64 u_short ar_op; /* one of: */ 65 #define ARPOP_REQUEST 1 /* request to resolve address */ 66 #define ARPOP_REPLY 2 /* response to previous request */ 67 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */ 68 #define ARPOP_REVREPLY 4 /* response giving protocol address */ 69 #define ARPOP_INVREQUEST 8 /* request to identify peer */ 70 #define ARPOP_INVREPLY 9 /* response identifying peer */ 71 /* 72 * The remaining fields are variable in size, 73 * according to the sizes above. 74 */ 75 #ifdef COMMENT_ONLY 76 u_char ar_sha[]; /* sender hardware address */ 77 u_char ar_spa[]; /* sender protocol address */ 78 u_char ar_tha[]; /* target hardware address */ 79 u_char ar_tpa[]; /* target protocol address */ 80 #endif 81 }; 82 83 #define ar_sha(ap) (((caddr_t)((ap)+1)) + 0) 84 #define ar_spa(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln) 85 #define ar_tha(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln + (ap)->ar_pln) 86 #define ar_tpa(ap) (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln) 87 88 #define arphdr_len2(ar_hln, ar_pln) \ 89 (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln)) 90 #define arphdr_len(ap) (arphdr_len2((ap)->ar_hln, (ap)->ar_pln)) 91 92 /* 93 * ARP ioctl request 94 */ 95 struct arpreq { 96 struct sockaddr arp_pa; /* protocol address */ 97 struct sockaddr arp_ha; /* hardware address */ 98 int arp_flags; /* flags */ 99 }; 100 /* arp_flags and at_flags field values */ 101 #define ATF_INUSE 0x01 /* entry in use */ 102 #define ATF_COM 0x02 /* completed entry (enaddr valid) */ 103 #define ATF_PERM 0x04 /* permanent entry */ 104 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */ 105 #define ATF_USETRAILERS 0x10 /* has requested trailers */ 106 107 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 108 #ifndef _NET_IF_VAR_H_ 109 #include <net/if_var.h> 110 #endif 111 112 /* 113 * Structure shared between the ethernet driver modules and 114 * the address resolution code. For example, each ec_softc or il_softc 115 * begins with this structure. 116 */ 117 struct arpcom { 118 /* 119 * The ifnet struct _must_ be at the head of this structure. 120 */ 121 struct ifnet ac_if; /* network-visible interface */ 122 u_char ac_enaddr[6]; /* ethernet hardware address */ 123 int ac_multicnt; /* length of ac_multiaddrs list */ 124 void *ac_netgraph; /* ng_ether(4) netgraph node info */ 125 }; 126 127 #endif 128 129 #endif /* !_NET_IF_ARP_H_ */ 130