/* Definitions for Address Resolution Protocol.
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Copyright (C) 1997-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Based on the 4.4BSD and Linux version of this file. */
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#ifndef _NET_IF_ARP_H
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#define _NET_IF_ARP_H 1
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <stdint.h>
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__BEGIN_DECLS
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/* Some internals from deep down in the kernel. */
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#define MAX_ADDR_LEN 7
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/* This structure defines an ethernet arp header. */
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/* ARP protocol opcodes. */
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#define ARPOP_REQUEST 1 /* ARP request. */
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#define ARPOP_REPLY 2 /* ARP reply. */
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#define ARPOP_RREQUEST 3 /* RARP request. */
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#define ARPOP_RREPLY 4 /* RARP reply. */
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#define ARPOP_InREQUEST 8 /* InARP request. */
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#define ARPOP_InREPLY 9 /* InARP reply. */
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#define ARPOP_NAK 10 /* (ATM)ARP NAK. */
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/* See RFC 826 for protocol description. ARP packets are variable
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in size; the arphdr structure defines the fixed-length portion.
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Protocol type values are the same as those for 10 Mb/s Ethernet.
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It is followed by the variable-sized fields ar_sha, arp_spa,
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arp_tha and arp_tpa in that order, according to the lengths
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specified. Field names used correspond to RFC 826. */
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struct arphdr
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{
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unsigned short int ar_hrd; /* Format of hardware address. */
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unsigned short int ar_pro; /* Format of protocol address. */
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unsigned char ar_hln; /* Length of hardware address. */
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unsigned char ar_pln; /* Length of protocol address. */
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unsigned short int ar_op; /* ARP opcode (command). */
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#if 0
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/* Ethernet looks like this : This bit is variable sized
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however... */
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unsigned char __ar_sha[ETH_ALEN]; /* Sender hardware address. */
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unsigned char __ar_sip[4]; /* Sender IP address. */
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unsigned char __ar_tha[ETH_ALEN]; /* Target hardware address. */
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unsigned char __ar_tip[4]; /* Target IP address. */
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#endif
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};
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/* ARP protocol HARDWARE identifiers. */
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#define ARPHRD_NETROM 0 /* From KA9Q: NET/ROM pseudo. */
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#define ARPHRD_ETHER 1 /* Ethernet 10/100Mbps. */
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#define ARPHRD_EETHER 2 /* Experimental Ethernet. */
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#define ARPHRD_AX25 3 /* AX.25 Level 2. */
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#define ARPHRD_PRONET 4 /* PROnet token ring. */
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#define ARPHRD_CHAOS 5 /* Chaosnet. */
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#define ARPHRD_IEEE802 6 /* IEEE 802.2 Ethernet/TR/TB. */
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#define ARPHRD_ARCNET 7 /* ARCnet. */
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#define ARPHRD_APPLETLK 8 /* APPLEtalk. */
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#define ARPHRD_DLCI 15 /* Frame Relay DLCI. */
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#define ARPHRD_ATM 19 /* ATM. */
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#define ARPHRD_METRICOM 23 /* Metricom STRIP (new IANA id). */
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#define ARPHRD_IEEE1394 24 /* IEEE 1394 IPv4 - RFC 2734. */
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#define ARPHRD_EUI64 27 /* EUI-64. */
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#define ARPHRD_INFINIBAND 32 /* InfiniBand. */
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/* Dummy types for non ARP hardware */
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#define ARPHRD_SLIP 256
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#define ARPHRD_CSLIP 257
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#define ARPHRD_SLIP6 258
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#define ARPHRD_CSLIP6 259
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#define ARPHRD_RSRVD 260 /* Notional KISS type. */
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#define ARPHRD_ADAPT 264
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#define ARPHRD_ROSE 270
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#define ARPHRD_X25 271 /* CCITT X.25. */
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#define ARPHRD_HWX25 272 /* Boards with X.25 in firmware. */
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#define ARPHRD_PPP 512
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#define ARPHRD_CISCO 513 /* Cisco HDLC. */
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#define ARPHRD_HDLC ARPHRD_CISCO
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#define ARPHRD_LAPB 516 /* LAPB. */
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#define ARPHRD_DDCMP 517 /* Digital's DDCMP. */
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#define ARPHRD_RAWHDLC 518 /* Raw HDLC. */
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#define ARPHRD_RAWIP 519 /* Raw IP. */
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#define ARPHRD_TUNNEL 768 /* IPIP tunnel. */
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#define ARPHRD_TUNNEL6 769 /* IPIP6 tunnel. */
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#define ARPHRD_FRAD 770 /* Frame Relay Access Device. */
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#define ARPHRD_SKIP 771 /* SKIP vif. */
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#define ARPHRD_LOOPBACK 772 /* Loopback device. */
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#define ARPHRD_LOCALTLK 773 /* Localtalk device. */
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#define ARPHRD_FDDI 774 /* Fiber Distributed Data Interface. */
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#define ARPHRD_BIF 775 /* AP1000 BIF. */
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#define ARPHRD_SIT 776 /* sit0 device - IPv6-in-IPv4. */
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#define ARPHRD_IPDDP 777 /* IP-in-DDP tunnel. */
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#define ARPHRD_IPGRE 778 /* GRE over IP. */
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#define ARPHRD_PIMREG 779 /* PIMSM register interface. */
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#define ARPHRD_HIPPI 780 /* High Performance Parallel I'face. */
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#define ARPHRD_ASH 781 /* (Nexus Electronics) Ash. */
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#define ARPHRD_ECONET 782 /* Acorn Econet. */
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#define ARPHRD_IRDA 783 /* Linux-IrDA. */
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#define ARPHRD_FCPP 784 /* Point to point fibrechanel. */
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#define ARPHRD_FCAL 785 /* Fibrechanel arbitrated loop. */
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#define ARPHRD_FCPL 786 /* Fibrechanel public loop. */
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#define ARPHRD_FCFABRIC 787 /* Fibrechanel fabric. */
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#define ARPHRD_IEEE802_TR 800 /* Magic type ident for TR. */
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#define ARPHRD_IEEE80211 801 /* IEEE 802.11. */
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#define ARPHRD_IEEE80211_PRISM 802 /* IEEE 802.11 + Prism2 header. */
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#define ARPHRD_IEEE80211_RADIOTAP 803 /* IEEE 802.11 + radiotap header. */
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#define ARPHRD_IEEE802154 804 /* IEEE 802.15.4 header. */
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#define ARPHRD_IEEE802154_PHY 805 /* IEEE 802.15.4 PHY header. */
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#define ARPHRD_VOID 0xFFFF /* Void type, nothing is known. */
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#define ARPHRD_NONE 0xFFFE /* Zero header length. */
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/* ARP ioctl request. */
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struct arpreq
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{
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struct sockaddr arp_pa; /* Protocol address. */
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struct sockaddr arp_ha; /* Hardware address. */
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int arp_flags; /* Flags. */
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struct sockaddr arp_netmask; /* Netmask (only for proxy arps). */
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char arp_dev[16];
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};
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struct arpreq_old
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{
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struct sockaddr arp_pa; /* Protocol address. */
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struct sockaddr arp_ha; /* Hardware address. */
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int arp_flags; /* Flags. */
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struct sockaddr arp_netmask; /* Netmask (only for proxy arps). */
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};
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/* ARP Flag values. */
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#define ATF_COM 0x02 /* Completed entry (ha valid). */
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#define ATF_PERM 0x04 /* Permanent entry. */
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#define ATF_PUBL 0x08 /* Publish entry. */
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#define ATF_USETRAILERS 0x10 /* Has requested trailers. */
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#define ATF_NETMASK 0x20 /* Want to use a netmask (only
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for proxy entries). */
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#define ATF_DONTPUB 0x40 /* Don't answer this addresses. */
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#define ATF_MAGIC 0x80 /* Automatically added entry. */
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/* Support for the user space arp daemon, arpd. */
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#define ARPD_UPDATE 0x01
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#define ARPD_LOOKUP 0x02
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#define ARPD_FLUSH 0x03
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struct arpd_request
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{
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unsigned short int req; /* Request type. */
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uint32_t ip; /* IP address of entry. */
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unsigned long int dev; /* Device entry is tied to. */
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unsigned long int stamp;
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unsigned long int updated;
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unsigned char ha[MAX_ADDR_LEN]; /* Hardware address. */
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};
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__END_DECLS
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#endif /* net/if_arp.h */
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