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 32#ifndef _NET_IF_ARP_H_ 33#define _NET_IF_ARP_H_ 34 35/* 36 * Address Resolution Protocol. 37 * 38 * See RFC 826 for protocol description. ARP packets are variable 39 * in size; the arphdr structure defines the fixed-length portion. 40 * Protocol type values are the same as those for 10 Mb/s Ethernet. 41 * It is followed by the variable-sized fields ar_sha, arp_spa, 42 * arp_tha and arp_tpa in that order, according to the lengths 43 * specified. Field names used correspond to RFC 826. 44 */ 45struct arphdr { 46 u_short ar_hrd; /* format of hardware address */ 47#define ARPHRD_ETHER 1 /* ethernet hardware format */ 48#define ARPHRD_IEEE802 6 /* 802.2 networks (ethernet/tb/tr) */ 49#define ARPHRD_FRELAY 15 /* frame relay hardware format */ 50#define ARPHRD_IEEE1394 24 /* firewire hardware format */ 51#define ARPHRD_INFINIBAND 32 /* infiniband hardware format */ 52 u_short ar_pro; /* format of protocol address */ 53 u_char ar_hln; /* length of hardware address */ 54 u_char ar_pln; /* length of protocol address */ 55 u_short ar_op; /* one of: */ 56#define ARPOP_REQUEST 1 /* request to resolve address */ 57#define ARPOP_REPLY 2 /* response to previous request */ 58#define ARPOP_REVREQUEST 3 /* request protocol address given hardware */ 59#define ARPOP_REVREPLY 4 /* response giving protocol address */ 60#define ARPOP_INVREQUEST 8 /* request to identify peer */ 61#define ARPOP_INVREPLY 9 /* response identifying peer */ 62/* 63 * The remaining fields are variable in size, 64 * according to the sizes above. 65 */ 66#ifdef COMMENT_ONLY 67 u_char ar_sha[]; /* sender hardware address */ 68 u_char ar_spa[]; /* sender protocol address */ 69 u_char ar_tha[]; /* target hardware address */ 70 u_char ar_tpa[]; /* target protocol address */ 71#endif 72}; 73 74#define ar_sha(ap) (((caddr_t)((ap)+1)) + 0) 75#define ar_spa(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln) 76#define ar_tha(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln + (ap)->ar_pln) 77#define ar_tpa(ap) (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln) 78 79#define arphdr_len2(ar_hln, ar_pln) \ 80 (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln)) 81#define arphdr_len(ap) (arphdr_len2((ap)->ar_hln, (ap)->ar_pln)) 82 83/* 84 * ARP ioctl request 85 */ 86struct arpreq { 87 struct sockaddr arp_pa; /* protocol address */ 88 struct sockaddr arp_ha; /* hardware address */ 89 int arp_flags; /* flags */ 90}; 91/* arp_flags and at_flags field values */ 92#define ATF_INUSE 0x01 /* entry in use */ 93#define ATF_COM 0x02 /* completed entry (enaddr valid) */ 94#define ATF_PERM 0x04 /* permanent entry */ 95#define ATF_PUBL 0x08 /* publish entry (respond for other host) */ 96#define ATF_USETRAILERS 0x10 /* has requested trailers */ 97 98struct arpstat { 99 /* Normal things that happen: */ 100 uint64_t txrequests; /* # of ARP requests sent by this host. */ 101 uint64_t txreplies; /* # of ARP replies sent by this host. */ 102 uint64_t rxrequests; /* # of ARP requests received by this host. */ 103 uint64_t rxreplies; /* # of ARP replies received by this host. */ 104 uint64_t received; /* # of ARP packets received by this host. */ 105 uint64_t txerrors; /* # of ARP requests failed to send. */ 106 107 uint64_t arp_spares[3]; /* For either the upper or lower half. */ 108 /* Abnormal event and error counting: */ 109 uint64_t dropped; /* # of packets dropped waiting for a reply. */ 110 uint64_t timeouts; /* # of times with entries removed */ 111 /* due to timeout. */ 112 uint64_t dupips; /* # of duplicate IPs detected. */ 113}; 114 115#ifdef _KERNEL 116#include <sys/counter.h> 117#include <net/vnet.h> 118 119VNET_PCPUSTAT_DECLARE(struct arpstat, arpstat); 120/* 121 * In-kernel consumers can use these accessor macros directly to update 122 * stats. 123 */ 124#define ARPSTAT_ADD(name, val) \ 125 VNET_PCPUSTAT_ADD(struct arpstat, arpstat, name, (val)) 126#define ARPSTAT_SUB(name, val) ARPSTAT_ADD(name, -(val)) 127#define ARPSTAT_INC(name) ARPSTAT_ADD(name, 1) 128#define ARPSTAT_DEC(name) ARPSTAT_SUB(name, 1) 129 130#endif /* _KERNEL */ 131 132#endif /* !_NET_IF_ARP_H_ */ 133