1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Global definitions for the ARP (RFC 826) protocol.
8 *
9 * Version: @(#)if_arp.h 1.0.1 04/16/93
10 *
11 * Authors: Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
12 * Portions taken from the KA9Q/NOS (v2.00m PA0GRI) source.
13 * Ross Biro
14 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
15 * Florian La Roche,
16 * Jonathan Layes <layes@loran.com>
17 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> ARPHRD_HWX25
18 *
19 * This program is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU General Public License
21 * as published by the Free Software Foundation; either version
22 * 2 of the License, or (at your option) any later version.
23 */
24#ifndef _LINUX_IF_ARP_H
25#define _LINUX_IF_ARP_H
26
27#include <linux/netdevice.h>
28
29/* ARP protocol HARDWARE identifiers. */
30#define ARPHRD_NETROM 0 /* from KA9Q: NET/ROM pseudo */
31#define ARPHRD_ETHER 1 /* Ethernet 10Mbps */
32#define ARPHRD_EETHER 2 /* Experimental Ethernet */
33#define ARPHRD_AX25 3 /* AX.25 Level 2 */
34#define ARPHRD_PRONET 4 /* PROnet token ring */
35#define ARPHRD_CHAOS 5 /* Chaosnet */
36#define ARPHRD_IEEE802 6 /* IEEE 802.2 Ethernet/TR/TB */
37#define ARPHRD_ARCNET 7 /* ARCnet */
38#define ARPHRD_APPLETLK 8 /* APPLEtalk */
39#define ARPHRD_DLCI 15 /* Frame Relay DLCI */
40#define ARPHRD_ATM 19 /* ATM */
41#define ARPHRD_METRICOM 23 /* Metricom STRIP (new IANA id) */
42#define ARPHRD_IEEE1394 24 /* IEEE 1394 IPv4 - RFC 2734 */
43#define ARPHRD_EUI64 27 /* EUI-64 */
44#define ARPHRD_INFINIBAND 32 /* InfiniBand */
45
46/* Dummy types for non ARP hardware */
47#define ARPHRD_SLIP 256
48#define ARPHRD_CSLIP 257
49#define ARPHRD_SLIP6 258
50#define ARPHRD_CSLIP6 259
51#define ARPHRD_RSRVD 260 /* Notional KISS type */
52#define ARPHRD_ADAPT 264
53#define ARPHRD_ROSE 270
54#define ARPHRD_X25 271 /* CCITT X.25 */
55#define ARPHRD_HWX25 272 /* Boards with X.25 in firmware */
56#define ARPHRD_CAN 280 /* Controller Area Network */
57#define ARPHRD_MCTP 290
58#define ARPHRD_PPP 512
59#define ARPHRD_CISCO 513 /* Cisco HDLC */
60#define ARPHRD_HDLC ARPHRD_CISCO
61#define ARPHRD_LAPB 516 /* LAPB */
62#define ARPHRD_DDCMP 517 /* Digital's DDCMP protocol */
63#define ARPHRD_RAWHDLC 518 /* Raw HDLC */
64#define ARPHRD_RAWIP 519 /* Raw IP */
65
66#define ARPHRD_TUNNEL 768 /* IPIP tunnel */
67#define ARPHRD_TUNNEL6 769 /* IP6IP6 tunnel */
68#define ARPHRD_FRAD 770 /* Frame Relay Access Device */
69#define ARPHRD_SKIP 771 /* SKIP vif */
70#define ARPHRD_LOOPBACK 772 /* Loopback device */
71#define ARPHRD_LOCALTLK 773 /* Localtalk device */
72#define ARPHRD_FDDI 774 /* Fiber Distributed Data Interface */
73#define ARPHRD_BIF 775 /* AP1000 BIF */
74#define ARPHRD_SIT 776 /* sit0 device - IPv6-in-IPv4 */
75#define ARPHRD_IPDDP 777 /* IP over DDP tunneller */
76#define ARPHRD_IPGRE 778 /* GRE over IP */
77#define ARPHRD_PIMREG 779 /* PIMSM register interface */
78#define ARPHRD_HIPPI 780 /* High Performance Parallel Interface */
79#define ARPHRD_ASH 781 /* Nexus 64Mbps Ash */
80#define ARPHRD_ECONET 782 /* Acorn Econet */
81#define ARPHRD_IRDA 783 /* Linux-IrDA */
82/* ARP works differently on different FC media .. so */
83#define ARPHRD_FCPP 784 /* Point to point fibrechannel */
84#define ARPHRD_FCAL 785 /* Fibrechannel arbitrated loop */
85#define ARPHRD_FCPL 786 /* Fibrechannel public loop */
86#define ARPHRD_FCFABRIC 787 /* Fibrechannel fabric */
87 /* 787->799 reserved for fibrechannel media types */
88#define ARPHRD_IEEE802_TR 800 /* Magic type ident for TR */
89#define ARPHRD_IEEE80211 801 /* IEEE 802.11 */
90#define ARPHRD_IEEE80211_PRISM 802 /* IEEE 802.11 + Prism2 header */
91#define ARPHRD_IEEE80211_RADIOTAP 803 /* IEEE 802.11 + radiotap header */
92#define ARPHRD_IEEE802154 804
93#define ARPHRD_IEEE802154_MONITOR 805 /* IEEE 802.15.4 network monitor */
94
95#define ARPHRD_PHONET 820 /* PhoNet media type */
96#define ARPHRD_PHONET_PIPE 821 /* PhoNet pipe header */
97#define ARPHRD_CAIF 822 /* CAIF media type */
98#define ARPHRD_IP6GRE 823 /* GRE over IPv6 */
99#define ARPHRD_NETLINK 824 /* Netlink header */
100#define ARPHRD_6LOWPAN 825 /* IPv6 over LoWPAN */
101#define ARPHRD_VSOCKMON 826 /* Vsock monitor header */
102
103#define ARPHRD_VOID 0xFFFF /* Void type, nothing is known */
104#define ARPHRD_NONE 0xFFFE /* zero header length */
105
106/* ARP protocol opcodes. */
107#define ARPOP_REQUEST 1 /* ARP request */
108#define ARPOP_REPLY 2 /* ARP reply */
109#define ARPOP_RREQUEST 3 /* RARP request */
110#define ARPOP_RREPLY 4 /* RARP reply */
111#define ARPOP_InREQUEST 8 /* InARP request */
112#define ARPOP_InREPLY 9 /* InARP reply */
113#define ARPOP_NAK 10 /* (ATM)ARP NAK */
114
115
116/* ARP ioctl request. */
117struct arpreq {
118 struct sockaddr arp_pa; /* protocol address */
119 struct sockaddr arp_ha; /* hardware address */
120 int arp_flags; /* flags */
121 struct sockaddr arp_netmask; /* netmask (only for proxy arps) */
122 char arp_dev[IFNAMSIZ];
123};
124
125struct arpreq_old {
126 struct sockaddr arp_pa; /* protocol address */
127 struct sockaddr arp_ha; /* hardware address */
128 int arp_flags; /* flags */
129 struct sockaddr arp_netmask; /* netmask (only for proxy arps) */
130};
131
132/* ARP Flag values. */
133#define ATF_COM 0x02 /* completed entry (ha valid) */
134#define ATF_PERM 0x04 /* permanent entry */
135#define ATF_PUBL 0x08 /* publish entry */
136#define ATF_USETRAILERS 0x10 /* has requested trailers */
137#define ATF_NETMASK 0x20 /* want to use a netmask (only
138 for proxy entries) */
139#define ATF_DONTPUB 0x40 /* don't answer this addresses */
140
141/*
142 * This structure defines an ethernet arp header.
143 */
144
145struct arphdr {
146 __be16 ar_hrd; /* format of hardware address */
147 __be16 ar_pro; /* format of protocol address */
148 unsigned char ar_hln; /* length of hardware address */
149 unsigned char ar_pln; /* length of protocol address */
150 __be16 ar_op; /* ARP opcode (command) */
151
152#if 0
153 /*
154 * Ethernet looks like this : This bit is variable sized however...
155 */
156 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
157 unsigned char ar_sip[4]; /* sender IP address */
158 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
159 unsigned char ar_tip[4]; /* target IP address */
160#endif
161
162};
163
164
165#endif /* _LINUX_IF_ARP_H */
166

source code of include/linux/if_arp.h