linux/include/linux/if_arp.h
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   1/*
   2 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3 *              operating system.  INET is implemented using the  BSD Socket
   4 *              interface as the means of communication with the user level.
   5 *
   6 *              Global definitions for the ARP (RFC 826) protocol.
   7 *
   8 * Version:     @(#)if_arp.h    1.0.1   04/16/93
   9 *
  10 * Authors:     Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
  11 *              Portions taken from the KA9Q/NOS (v2.00m PA0GRI) source.
  12 *              Ross Biro
  13 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  14 *              Florian La Roche,
  15 *              Jonathan Layes <layes@loran.com>
  16 *              Arnaldo Carvalho de Melo <acme@conectiva.com.br> ARPHRD_HWX25
  17 *
  18 *              This program is free software; you can redistribute it and/or
  19 *              modify it under the terms of the GNU General Public License
  20 *              as published by the Free Software Foundation; either version
  21 *              2 of the License, or (at your option) any later version.
  22 */
  23#ifndef _LINUX_IF_ARP_H
  24#define _LINUX_IF_ARP_H
  25
  26#include <linux/netdevice.h>
  27
  28/* ARP protocol HARDWARE identifiers. */
  29#define ARPHRD_NETROM   0               /* from KA9Q: NET/ROM pseudo    */
  30#define ARPHRD_ETHER    1               /* Ethernet 10Mbps              */
  31#define ARPHRD_EETHER   2               /* Experimental Ethernet        */
  32#define ARPHRD_AX25     3               /* AX.25 Level 2                */
  33#define ARPHRD_PRONET   4               /* PROnet token ring            */
  34#define ARPHRD_CHAOS    5               /* Chaosnet                     */
  35#define ARPHRD_IEEE802  6               /* IEEE 802.2 Ethernet/TR/TB    */
  36#define ARPHRD_ARCNET   7               /* ARCnet                       */
  37#define ARPHRD_APPLETLK 8               /* APPLEtalk                    */
  38#define ARPHRD_DLCI     15              /* Frame Relay DLCI             */
  39#define ARPHRD_ATM      19              /* ATM                          */
  40#define ARPHRD_METRICOM 23              /* Metricom STRIP (new IANA id) */
  41#define ARPHRD_IEEE1394 24              /* IEEE 1394 IPv4 - RFC 2734    */
  42#define ARPHRD_EUI64    27              /* EUI-64                       */
  43#define ARPHRD_INFINIBAND 32            /* InfiniBand                   */
  44
  45/* Dummy types for non ARP hardware */
  46#define ARPHRD_SLIP     256
  47#define ARPHRD_CSLIP    257
  48#define ARPHRD_SLIP6    258
  49#define ARPHRD_CSLIP6   259
  50#define ARPHRD_RSRVD    260             /* Notional KISS type           */
  51#define ARPHRD_ADAPT    264
  52#define ARPHRD_ROSE     270
  53#define ARPHRD_X25      271             /* CCITT X.25                   */
  54#define ARPHRD_HWX25    272             /* Boards with X.25 in firmware */
  55#define ARPHRD_CAN      280             /* Controller Area Network      */
  56#define ARPHRD_PPP      512
  57#define ARPHRD_CISCO    513             /* Cisco HDLC                   */
  58#define ARPHRD_HDLC     ARPHRD_CISCO
  59#define ARPHRD_LAPB     516             /* LAPB                         */
  60#define ARPHRD_DDCMP    517             /* Digital's DDCMP protocol     */
  61#define ARPHRD_RAWHDLC  518             /* Raw HDLC                     */
  62
  63#define ARPHRD_TUNNEL   768             /* IPIP tunnel                  */
  64#define ARPHRD_TUNNEL6  769             /* IP6IP6 tunnel                */
  65#define ARPHRD_FRAD     770             /* Frame Relay Access Device    */
  66#define ARPHRD_SKIP     771             /* SKIP vif                     */
  67#define ARPHRD_LOOPBACK 772             /* Loopback device              */
  68#define ARPHRD_LOCALTLK 773             /* Localtalk device             */
  69#define ARPHRD_FDDI     774             /* Fiber Distributed Data Interface */
  70#define ARPHRD_BIF      775             /* AP1000 BIF                   */
  71#define ARPHRD_SIT      776             /* sit0 device - IPv6-in-IPv4   */
  72#define ARPHRD_IPDDP    777             /* IP over DDP tunneller        */
  73#define ARPHRD_IPGRE    778             /* GRE over IP                  */
  74#define ARPHRD_PIMREG   779             /* PIMSM register interface     */
  75#define ARPHRD_HIPPI    780             /* High Performance Parallel Interface */
  76#define ARPHRD_ASH      781             /* Nexus 64Mbps Ash             */
  77#define ARPHRD_ECONET   782             /* Acorn Econet                 */
  78#define ARPHRD_IRDA     783             /* Linux-IrDA                   */
  79/* ARP works differently on different FC media .. so  */
  80#define ARPHRD_FCPP     784             /* Point to point fibrechannel  */
  81#define ARPHRD_FCAL     785             /* Fibrechannel arbitrated loop */
  82#define ARPHRD_FCPL     786             /* Fibrechannel public loop     */
  83#define ARPHRD_FCFABRIC 787             /* Fibrechannel fabric          */
  84        /* 787->799 reserved for fibrechannel media types */
  85#define ARPHRD_IEEE802_TR 800           /* Magic type ident for TR      */
  86#define ARPHRD_IEEE80211 801            /* IEEE 802.11                  */
  87#define ARPHRD_IEEE80211_PRISM 802      /* IEEE 802.11 + Prism2 header  */
  88#define ARPHRD_IEEE80211_RADIOTAP 803   /* IEEE 802.11 + radiotap header */
  89
  90#define ARPHRD_VOID       0xFFFF        /* Void type, nothing is known */
  91#define ARPHRD_NONE       0xFFFE        /* zero header length */
  92
  93/* ARP protocol opcodes. */
  94#define ARPOP_REQUEST   1               /* ARP request                  */
  95#define ARPOP_REPLY     2               /* ARP reply                    */
  96#define ARPOP_RREQUEST  3               /* RARP request                 */
  97#define ARPOP_RREPLY    4               /* RARP reply                   */
  98#define ARPOP_InREQUEST 8               /* InARP request                */
  99#define ARPOP_InREPLY   9               /* InARP reply                  */
 100#define ARPOP_NAK       10              /* (ATM)ARP NAK                 */
 101
 102
 103/* ARP ioctl request. */
 104struct arpreq {
 105  struct sockaddr       arp_pa;         /* protocol address             */
 106  struct sockaddr       arp_ha;         /* hardware address             */
 107  int                   arp_flags;      /* flags                        */
 108  struct sockaddr       arp_netmask;    /* netmask (only for proxy arps) */
 109  char                  arp_dev[16];
 110};
 111
 112struct arpreq_old {
 113  struct sockaddr       arp_pa;         /* protocol address             */
 114  struct sockaddr       arp_ha;         /* hardware address             */
 115  int                   arp_flags;      /* flags                        */
 116  struct sockaddr       arp_netmask;    /* netmask (only for proxy arps) */
 117};
 118
 119/* ARP Flag values. */
 120#define ATF_COM         0x02            /* completed entry (ha valid)   */
 121#define ATF_PERM        0x04            /* permanent entry              */
 122#define ATF_PUBL        0x08            /* publish entry                */
 123#define ATF_USETRAILERS 0x10            /* has requested trailers       */
 124#define ATF_NETMASK     0x20            /* want to use a netmask (only
 125                                           for proxy entries) */
 126#define ATF_DONTPUB     0x40            /* don't answer this addresses  */
 127
 128/*
 129 *      This structure defines an ethernet arp header.
 130 */
 131
 132struct arphdr
 133{
 134        __be16          ar_hrd;         /* format of hardware address   */
 135        __be16          ar_pro;         /* format of protocol address   */
 136        unsigned char   ar_hln;         /* length of hardware address   */
 137        unsigned char   ar_pln;         /* length of protocol address   */
 138        __be16          ar_op;          /* ARP opcode (command)         */
 139
 140#if 0
 141         /*
 142          *      Ethernet looks like this : This bit is variable sized however...
 143          */
 144        unsigned char           ar_sha[ETH_ALEN];       /* sender hardware address      */
 145        unsigned char           ar_sip[4];              /* sender IP address            */
 146        unsigned char           ar_tha[ETH_ALEN];       /* target hardware address      */
 147        unsigned char           ar_tip[4];              /* target IP address            */
 148#endif
 149
 150};
 151
 152#ifdef __KERNEL__
 153#include <linux/skbuff.h>
 154
 155static inline struct arphdr *arp_hdr(const struct sk_buff *skb)
 156{
 157        return (struct arphdr *)skb_network_header(skb);
 158}
 159
 160static inline int arp_hdr_len(struct net_device *dev)
 161{
 162        /* ARP header, plus 2 device addresses, plus 2 IP addresses. */
 163        return sizeof(struct arphdr) + (dev->addr_len + sizeof(u32)) * 2;
 164}
 165#endif
 166
 167#endif  /* _LINUX_IF_ARP_H */
 168
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