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 1.7 2006/05/21 03:43:45 dillon 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 #ifndef _NET_IF_H_ 48 #include <net/if.h> 49 #endif 50 #ifndef _NET_IF_VAR_H_ 51 #include <net/if_var.h> 52 #endif 53 54 /* 55 * Address Resolution Protocol. 56 * 57 * See RFC 826 for protocol description. ARP packets are variable 58 * in size; the arphdr structure defines the fixed-length portion. 59 * Protocol type values are the same as those for 10 Mb/s Ethernet. 60 * It is followed by the variable-sized fields ar_sha, arp_spa, 61 * arp_tha and arp_tpa in that order, according to the lengths 62 * specified. Field names used correspond to RFC 826. 63 */ 64 struct arphdr { 65 u_short ar_hrd; /* format of hardware address */ 66 #define ARPHRD_ETHER 1 /* ethernet hardware format */ 67 #define ARPHRD_IEEE802 6 /* token-ring hardware format */ 68 #define ARPHRD_ARCNET 7 /* arcnet hardware format */ 69 #define ARPHRD_FRELAY 15 /* frame relay hardware format */ 70 u_short ar_pro; /* format of protocol address */ 71 u_char ar_hln; /* length of hardware address */ 72 u_char ar_pln; /* length of protocol address */ 73 u_short ar_op; /* one of: */ 74 #define ARPOP_REQUEST 1 /* request to resolve address */ 75 #define ARPOP_REPLY 2 /* response to previous request */ 76 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */ 77 #define ARPOP_REVREPLY 4 /* response giving protocol address */ 78 #define ARPOP_INVREQUEST 8 /* request to identify peer */ 79 #define ARPOP_INVREPLY 9 /* response identifying peer */ 80 /* 81 * The remaining fields are variable in size, 82 * according to the sizes above. 83 */ 84 #ifdef COMMENT_ONLY 85 u_char ar_sha[]; /* sender hardware address */ 86 u_char ar_spa[]; /* sender protocol address */ 87 u_char ar_tha[]; /* target hardware address */ 88 u_char ar_tpa[]; /* target protocol address */ 89 #endif 90 }; 91 92 #define ar_sha(ap) (((caddr_t)((ap)+1)) + 0) 93 #define ar_spa(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln) 94 #define ar_tha(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln + (ap)->ar_pln) 95 #define ar_tpa(ap) (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln) 96 97 #define arphdr_len2(ar_hln, ar_pln) \ 98 (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln)) 99 #define arphdr_len(ap) (arphdr_len2((ap)->ar_hln, (ap)->ar_pln)) 100 101 /* 102 * ARP ioctl request 103 */ 104 struct arpreq { 105 struct sockaddr arp_pa; /* protocol address */ 106 struct sockaddr arp_ha; /* hardware address */ 107 int arp_flags; /* flags */ 108 }; 109 /* arp_flags and at_flags field values */ 110 #define ATF_INUSE 0x01 /* entry in use */ 111 #define ATF_COM 0x02 /* completed entry (enaddr valid) */ 112 #define ATF_PERM 0x04 /* permanent entry */ 113 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */ 114 #define ATF_USETRAILERS 0x10 /* has requested trailers */ 115 116 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 117 118 /* 119 * Structure shared between the ethernet driver modules and 120 * the address resolution code. For example, each ec_softc or il_softc 121 * begins with this structure. 122 */ 123 struct arpcom { 124 /* 125 * The ifnet struct _must_ be at the head of this structure. 126 */ 127 struct ifnet ac_if; /* network-visible interface */ 128 u_char ac_enaddr[6]; /* ethernet hardware address */ 129 int ac_multicnt; /* length of ac_multiaddrs list */ 130 void *ac_netgraph; /* ng_ether(4) netgraph node info */ 131 }; 132 133 #endif 134 135 #endif /* !_NET_IF_ARP_H_ */ 136