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/* Definitions for Address Resolution Protocol.
Copyright (C) 1997-2019 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/cdefs.h>
#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. */
/* 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 10Mbps. */
#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_METRICOM 23 /* Metricom STRIP (new IANA id). */
/* 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_PPP 512
#define ARPHRD_HDLC 513 /* (Cisco) HDLC. */
#define ARPHRD_LAPB 516 /* LAPB. */
#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. */
/* 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];
};
/* 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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