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 #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 */ 87 struct 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 */ 104 struct 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 /* _KERNEL */ 112 113 struct arpstat { 114 /* Normal things that happen: */ 115 u_long txrequests; /* # of ARP requests sent by this host. */ 116 u_long txreplies; /* # of ARP replies sent by this host. */ 117 u_long rxrequests; /* # of ARP requests received by this host. */ 118 u_long rxreplies; /* # of ARP replies received by this host. */ 119 u_long received; /* # of ARP packets received by this host. */ 120 121 u_long arp_spares[4]; /* For either the upper or lower half. */ 122 /* Abnormal event and error counting: */ 123 u_long dropped; /* # of packets dropped waiting for a reply. */ 124 u_long timeouts; /* # of times with entries removed */ 125 /* due to timeout. */ 126 u_long dupips; /* # of duplicate IPs detected. */ 127 }; 128 129 /* 130 * In-kernel consumers can use these accessor macros directly to update 131 * stats. 132 */ 133 #define ARPSTAT_ADD(name, val) V_arpstat.name += (val) 134 #define ARPSTAT_SUB(name, val) V_arpstat.name -= (val) 135 #define ARPSTAT_INC(name) ARPSTAT_ADD(name, 1) 136 #define ARPSTAT_DEC(name) ARPSTAT_SUB(name, 1) 137 138 #endif /* !_NET_IF_ARP_H_ */ 139