1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)if_arp.h 8.1 (Berkeley) 6/10/93 32 * $FreeBSD$ 33 */ 34 35 #ifndef _NET_IF_ARP_H_ 36 #define _NET_IF_ARP_H_ 37 38 /* 39 * Address Resolution Protocol. 40 * 41 * See RFC 826 for protocol description. ARP packets are variable 42 * in size; the arphdr structure defines the fixed-length portion. 43 * Protocol type values are the same as those for 10 Mb/s Ethernet. 44 * It is followed by the variable-sized fields ar_sha, arp_spa, 45 * arp_tha and arp_tpa in that order, according to the lengths 46 * specified. Field names used correspond to RFC 826. 47 */ 48 struct arphdr { 49 u_short ar_hrd; /* format of hardware address */ 50 #define ARPHRD_ETHER 1 /* ethernet hardware format */ 51 #define ARPHRD_IEEE802 6 /* token-ring hardware format */ 52 #define ARPHRD_FRELAY 15 /* frame relay hardware format */ 53 #define ARPHRD_IEEE1394 24 /* firewire hardware format */ 54 #define ARPHRD_INFINIBAND 32 /* infiniband hardware format */ 55 u_short ar_pro; /* format of protocol address */ 56 u_char ar_hln; /* length of hardware address */ 57 u_char ar_pln; /* length of protocol address */ 58 u_short ar_op; /* one of: */ 59 #define ARPOP_REQUEST 1 /* request to resolve address */ 60 #define ARPOP_REPLY 2 /* response to previous request */ 61 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */ 62 #define ARPOP_REVREPLY 4 /* response giving protocol address */ 63 #define ARPOP_INVREQUEST 8 /* request to identify peer */ 64 #define ARPOP_INVREPLY 9 /* response identifying peer */ 65 /* 66 * The remaining fields are variable in size, 67 * according to the sizes above. 68 */ 69 #ifdef COMMENT_ONLY 70 u_char ar_sha[]; /* sender hardware address */ 71 u_char ar_spa[]; /* sender protocol address */ 72 u_char ar_tha[]; /* target hardware address */ 73 u_char ar_tpa[]; /* target protocol address */ 74 #endif 75 }; 76 77 #define ar_sha(ap) (((caddr_t)((ap)+1)) + 0) 78 #define ar_spa(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln) 79 #define ar_tha(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln + (ap)->ar_pln) 80 #define ar_tpa(ap) (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln) 81 82 #define arphdr_len2(ar_hln, ar_pln) \ 83 (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln)) 84 #define arphdr_len(ap) (arphdr_len2((ap)->ar_hln, (ap)->ar_pln)) 85 86 /* 87 * ARP ioctl request 88 */ 89 struct arpreq { 90 struct sockaddr arp_pa; /* protocol address */ 91 struct sockaddr arp_ha; /* hardware address */ 92 int arp_flags; /* flags */ 93 }; 94 /* arp_flags and at_flags field values */ 95 #define ATF_INUSE 0x01 /* entry in use */ 96 #define ATF_COM 0x02 /* completed entry (enaddr valid) */ 97 #define ATF_PERM 0x04 /* permanent entry */ 98 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */ 99 #define ATF_USETRAILERS 0x10 /* has requested trailers */ 100 101 struct arpstat { 102 /* Normal things that happen: */ 103 uint64_t txrequests; /* # of ARP requests sent by this host. */ 104 uint64_t txreplies; /* # of ARP replies sent by this host. */ 105 uint64_t rxrequests; /* # of ARP requests received by this host. */ 106 uint64_t rxreplies; /* # of ARP replies received by this host. */ 107 uint64_t received; /* # of ARP packets received by this host. */ 108 uint64_t txerrors; /* # of ARP requests failed to send. */ 109 110 uint64_t arp_spares[3]; /* For either the upper or lower half. */ 111 /* Abnormal event and error counting: */ 112 uint64_t dropped; /* # of packets dropped waiting for a reply. */ 113 uint64_t timeouts; /* # of times with entries removed */ 114 /* due to timeout. */ 115 uint64_t dupips; /* # of duplicate IPs detected. */ 116 }; 117 118 #ifdef _KERNEL 119 #include <sys/counter.h> 120 #include <net/vnet.h> 121 122 VNET_PCPUSTAT_DECLARE(struct arpstat, arpstat); 123 /* 124 * In-kernel consumers can use these accessor macros directly to update 125 * stats. 126 */ 127 #define ARPSTAT_ADD(name, val) \ 128 VNET_PCPUSTAT_ADD(struct arpstat, arpstat, name, (val)) 129 #define ARPSTAT_SUB(name, val) ARPSTAT_ADD(name, -(val)) 130 #define ARPSTAT_INC(name) ARPSTAT_ADD(name, 1) 131 #define ARPSTAT_DEC(name) ARPSTAT_SUB(name, 1) 132 133 #endif /* _KERNEL */ 134 135 #endif /* !_NET_IF_ARP_H_ */ 136