--- /dev/null
+/* Definitions for Address Resolution Protocol.
+ Copyright (C) 1997-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+/* Based on the 4.4BSD and Linux version of this file. */
+
+#ifndef _NET_IF_ARP_H
+#define _NET_IF_ARP_H 1
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdint.h>
+
+__BEGIN_DECLS
+
+/* Some internals from deep down in the kernel. */
+#define MAX_ADDR_LEN 7
+
+
+/* This structure defines an ethernet arp header. */
+
+/* ARP protocol opcodes. */
+#define ARPOP_REQUEST 1 /* ARP request. */
+#define ARPOP_REPLY 2 /* ARP reply. */
+#define ARPOP_RREQUEST 3 /* RARP request. */
+#define ARPOP_RREPLY 4 /* RARP reply. */
+#define ARPOP_InREQUEST 8 /* InARP request. */
+#define ARPOP_InREPLY 9 /* InARP reply. */
+#define ARPOP_NAK 10 /* (ATM)ARP NAK. */
+
+/* See RFC 826 for protocol description. ARP packets are variable
+ in size; the arphdr structure defines the fixed-length portion.
+ Protocol type values are the same as those for 10 Mb/s Ethernet.
+ It is followed by the variable-sized fields ar_sha, arp_spa,
+ arp_tha and arp_tpa in that order, according to the lengths
+ specified. Field names used correspond to RFC 826. */
+
+struct arphdr
+ {
+ unsigned short int ar_hrd; /* Format of hardware address. */
+ unsigned short int ar_pro; /* Format of protocol address. */
+ unsigned char ar_hln; /* Length of hardware address. */
+ unsigned char ar_pln; /* Length of protocol address. */
+ unsigned short int ar_op; /* ARP opcode (command). */
+#if 0
+ /* Ethernet looks like this : This bit is variable sized
+ however... */
+ unsigned char __ar_sha[ETH_ALEN]; /* Sender hardware address. */
+ unsigned char __ar_sip[4]; /* Sender IP address. */
+ unsigned char __ar_tha[ETH_ALEN]; /* Target hardware address. */
+ unsigned char __ar_tip[4]; /* Target IP address. */
+#endif
+ };
+
+
+/* ARP protocol HARDWARE identifiers. */
+#define ARPHRD_NETROM 0 /* From KA9Q: NET/ROM pseudo. */
+#define ARPHRD_ETHER 1 /* Ethernet 10/100Mbps. */
+#define ARPHRD_EETHER 2 /* Experimental Ethernet. */
+#define ARPHRD_AX25 3 /* AX.25 Level 2. */
+#define ARPHRD_PRONET 4 /* PROnet token ring. */
+#define ARPHRD_CHAOS 5 /* Chaosnet. */
+#define ARPHRD_IEEE802 6 /* IEEE 802.2 Ethernet/TR/TB. */
+#define ARPHRD_ARCNET 7 /* ARCnet. */
+#define ARPHRD_APPLETLK 8 /* APPLEtalk. */
+#define ARPHRD_DLCI 15 /* Frame Relay DLCI. */
+#define ARPHRD_ATM 19 /* ATM. */
+#define ARPHRD_METRICOM 23 /* Metricom STRIP (new IANA id). */
+#define ARPHRD_IEEE1394 24 /* IEEE 1394 IPv4 - RFC 2734. */
+#define ARPHRD_EUI64 27 /* EUI-64. */
+#define ARPHRD_INFINIBAND 32 /* InfiniBand. */
+
+/* Dummy types for non ARP hardware */
+#define ARPHRD_SLIP 256
+#define ARPHRD_CSLIP 257
+#define ARPHRD_SLIP6 258
+#define ARPHRD_CSLIP6 259
+#define ARPHRD_RSRVD 260 /* Notional KISS type. */
+#define ARPHRD_ADAPT 264
+#define ARPHRD_ROSE 270
+#define ARPHRD_X25 271 /* CCITT X.25. */
+#define ARPHRD_HWX25 272 /* Boards with X.25 in firmware. */
+#define ARPHRD_PPP 512
+#define ARPHRD_CISCO 513 /* Cisco HDLC. */
+#define ARPHRD_HDLC ARPHRD_CISCO
+#define ARPHRD_LAPB 516 /* LAPB. */
+#define ARPHRD_DDCMP 517 /* Digital's DDCMP. */
+#define ARPHRD_RAWHDLC 518 /* Raw HDLC. */
+#define ARPHRD_RAWIP 519 /* Raw IP. */
+
+#define ARPHRD_TUNNEL 768 /* IPIP tunnel. */
+#define ARPHRD_TUNNEL6 769 /* IPIP6 tunnel. */
+#define ARPHRD_FRAD 770 /* Frame Relay Access Device. */
+#define ARPHRD_SKIP 771 /* SKIP vif. */
+#define ARPHRD_LOOPBACK 772 /* Loopback device. */
+#define ARPHRD_LOCALTLK 773 /* Localtalk device. */
+#define ARPHRD_FDDI 774 /* Fiber Distributed Data Interface. */
+#define ARPHRD_BIF 775 /* AP1000 BIF. */
+#define ARPHRD_SIT 776 /* sit0 device - IPv6-in-IPv4. */
+#define ARPHRD_IPDDP 777 /* IP-in-DDP tunnel. */
+#define ARPHRD_IPGRE 778 /* GRE over IP. */
+#define ARPHRD_PIMREG 779 /* PIMSM register interface. */
+#define ARPHRD_HIPPI 780 /* High Performance Parallel I'face. */
+#define ARPHRD_ASH 781 /* (Nexus Electronics) Ash. */
+#define ARPHRD_ECONET 782 /* Acorn Econet. */
+#define ARPHRD_IRDA 783 /* Linux-IrDA. */
+#define ARPHRD_FCPP 784 /* Point to point fibrechanel. */
+#define ARPHRD_FCAL 785 /* Fibrechanel arbitrated loop. */
+#define ARPHRD_FCPL 786 /* Fibrechanel public loop. */
+#define ARPHRD_FCFABRIC 787 /* Fibrechanel fabric. */
+#define ARPHRD_IEEE802_TR 800 /* Magic type ident for TR. */
+#define ARPHRD_IEEE80211 801 /* IEEE 802.11. */
+#define ARPHRD_IEEE80211_PRISM 802 /* IEEE 802.11 + Prism2 header. */
+#define ARPHRD_IEEE80211_RADIOTAP 803 /* IEEE 802.11 + radiotap header. */
+#define ARPHRD_IEEE802154 804 /* IEEE 802.15.4 header. */
+#define ARPHRD_IEEE802154_PHY 805 /* IEEE 802.15.4 PHY header. */
+
+#define ARPHRD_VOID 0xFFFF /* Void type, nothing is known. */
+#define ARPHRD_NONE 0xFFFE /* Zero header length. */
+
+
+/* ARP ioctl request. */
+struct arpreq
+ {
+ struct sockaddr arp_pa; /* Protocol address. */
+ struct sockaddr arp_ha; /* Hardware address. */
+ int arp_flags; /* Flags. */
+ struct sockaddr arp_netmask; /* Netmask (only for proxy arps). */
+ char arp_dev[16];
+ };
+
+struct arpreq_old
+ {
+ struct sockaddr arp_pa; /* Protocol address. */
+ struct sockaddr arp_ha; /* Hardware address. */
+ int arp_flags; /* Flags. */
+ struct sockaddr arp_netmask; /* Netmask (only for proxy arps). */
+ };
+
+/* ARP Flag values. */
+#define ATF_COM 0x02 /* Completed entry (ha valid). */
+#define ATF_PERM 0x04 /* Permanent entry. */
+#define ATF_PUBL 0x08 /* Publish entry. */
+#define ATF_USETRAILERS 0x10 /* Has requested trailers. */
+#define ATF_NETMASK 0x20 /* Want to use a netmask (only
+ for proxy entries). */
+#define ATF_DONTPUB 0x40 /* Don't answer this addresses. */
+#define ATF_MAGIC 0x80 /* Automatically added entry. */
+
+
+/* Support for the user space arp daemon, arpd. */
+#define ARPD_UPDATE 0x01
+#define ARPD_LOOKUP 0x02
+#define ARPD_FLUSH 0x03
+
+struct arpd_request
+ {
+ unsigned short int req; /* Request type. */
+ uint32_t ip; /* IP address of entry. */
+ unsigned long int dev; /* Device entry is tied to. */
+ unsigned long int stamp;
+ unsigned long int updated;
+ unsigned char ha[MAX_ADDR_LEN]; /* Hardware address. */
+ };
+
+__END_DECLS
+
+#endif /* net/if_arp.h */
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