/* Definitions for Address Resolution Protocol.   Copyright (C) 1997 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, write to the Free   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA.  *//* 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>__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	0x03struct arpd_request  {    unsigned short int req;		/* Request type.  */    u_int32_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 */