include/linux/if_arp.h

   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. */
 104 struct 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
 112 struct 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
 132 struct 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
 155 static inline struct arphdr *arp_hdr(const struct sk_buff *skb)
 156 {
 157         return (struct arphdr *)skb_network_header(skb);
 158 }
 159
 160 static 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 */