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/* Definitions for Address Resolution Protocol.

   Copyright (C) 1997, 1999, 2001 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.  */

#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).  */

/* 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 ARPHDR_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_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_FCPFABRIC 787            /* Fibrechanel fabric.  */

#define ARPHRD_IEEE802_TR 800           /* Magic type ident for TR.  */

#define ARPHRD_IEEE80211 801            /* IEEE 802.11.  */

/* 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.  */

    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 */