sysdeps/unix/sysv/linux/net/if_arp.h

   1 /* Definitions for Address Resolution Protocol.
   2    Copyright (C) 1997-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 /* Based on the 4.4BSD and Linux version of this file.  */
  21
  22 #ifndef _NET_IF_ARP_H
  23 #define _NET_IF_ARP_H 1
  24
  25 #include <sys/types.h>
  26 #include <sys/socket.h>
  27 #include <stdint.h>
  28
  29 __BEGIN_DECLS
  30
  31 /* Some internals from deep down in the kernel.  */
  32 #define MAX_ADDR_LEN    7
  33
  34
  35 /* This structure defines an ethernet arp header.  */
  36
  37 /* ARP protocol opcodes. */
  38 #define ARPOP_REQUEST   1               /* ARP request.  */
  39 #define ARPOP_REPLY     2               /* ARP reply.  */
  40 #define ARPOP_RREQUEST  3               /* RARP request.  */
  41 #define ARPOP_RREPLY    4               /* RARP reply.  */
  42 #define ARPOP_InREQUEST 8               /* InARP request.  */
  43 #define ARPOP_InREPLY   9               /* InARP reply.  */
  44 #define ARPOP_NAK       10              /* (ATM)ARP NAK.  */
  45
  46 /* See RFC 826 for protocol description.  ARP packets are variable
  47    in size; the arphdr structure defines the fixed-length portion.
  48    Protocol type values are the same as those for 10 Mb/s Ethernet.
  49    It is followed by the variable-sized fields ar_sha, arp_spa,
  50    arp_tha and arp_tpa in that order, according to the lengths
  51    specified.  Field names used correspond to RFC 826.  */
  52
  53 struct arphdr
  54   {
  55     unsigned short int ar_hrd;          /* Format of hardware address.  */
  56     unsigned short int ar_pro;          /* Format of protocol address.  */
  57     unsigned char ar_hln;               /* Length of hardware address.  */
  58     unsigned char ar_pln;               /* Length of protocol address.  */
  59     unsigned short int ar_op;           /* ARP opcode (command).  */
  60 #if 0
  61     /* Ethernet looks like this : This bit is variable sized
  62        however...  */
  63     unsigned char __ar_sha[ETH_ALEN];   /* Sender hardware address.  */
  64     unsigned char __ar_sip[4];          /* Sender IP address.  */
  65     unsigned char __ar_tha[ETH_ALEN];   /* Target hardware address.  */
  66     unsigned char __ar_tip[4];          /* Target IP address.  */
  67 #endif
  68   };
  69
  70
  71 /* ARP protocol HARDWARE identifiers. */
  72 #define ARPHRD_NETROM   0               /* From KA9Q: NET/ROM pseudo. */
  73 #define ARPHRD_ETHER    1               /* Ethernet 10/100Mbps.  */
  74 #define ARPHRD_EETHER   2               /* Experimental Ethernet.  */
  75 #define ARPHRD_AX25     3               /* AX.25 Level 2.  */
  76 #define ARPHRD_PRONET   4               /* PROnet token ring.  */
  77 #define ARPHRD_CHAOS    5               /* Chaosnet.  */
  78 #define ARPHRD_IEEE802  6               /* IEEE 802.2 Ethernet/TR/TB.  */
  79 #define ARPHRD_ARCNET   7               /* ARCnet.  */
  80 #define ARPHRD_APPLETLK 8               /* APPLEtalk.  */
  81 #define ARPHRD_DLCI     15              /* Frame Relay DLCI.  */
  82 #define ARPHRD_ATM      19              /* ATM.  */
  83 #define ARPHRD_METRICOM 23              /* Metricom STRIP (new IANA id).  */
  84 #define ARPHRD_IEEE1394 24              /* IEEE 1394 IPv4 - RFC 2734.  */
  85 #define ARPHRD_EUI64            27              /* EUI-64.  */
  86 #define ARPHRD_INFINIBAND       32              /* InfiniBand.  */
  87
  88 /* Dummy types for non ARP hardware */
  89 #define ARPHRD_SLIP     256
  90 #define ARPHRD_CSLIP    257
  91 #define ARPHRD_SLIP6    258
  92 #define ARPHRD_CSLIP6   259
  93 #define ARPHRD_RSRVD    260             /* Notional KISS type.  */
  94 #define ARPHRD_ADAPT    264
  95 #define ARPHRD_ROSE     270
  96 #define ARPHRD_X25      271             /* CCITT X.25.  */
  97 #define ARPHRD_HWX25    272             /* Boards with X.25 in firmware.  */
  98 #define ARPHRD_PPP      512
  99 #define ARPHRD_CISCO    513             /* Cisco HDLC.  */
 100 #define ARPHRD_HDLC     ARPHRD_CISCO
 101 #define ARPHRD_LAPB     516             /* LAPB.  */
 102 #define ARPHRD_DDCMP    517             /* Digital's DDCMP.  */
 103 #define ARPHRD_RAWHDLC  518             /* Raw HDLC.  */
 104 #define ARPHRD_RAWIP    519             /* Raw IP.  */
 105
 106 #define ARPHRD_TUNNEL   768             /* IPIP tunnel.  */
 107 #define ARPHRD_TUNNEL6  769             /* IPIP6 tunnel.  */
 108 #define ARPHRD_FRAD     770             /* Frame Relay Access Device.  */
 109 #define ARPHRD_SKIP     771             /* SKIP vif.  */
 110 #define ARPHRD_LOOPBACK 772             /* Loopback device.  */
 111 #define ARPHRD_LOCALTLK 773             /* Localtalk device.  */
 112 #define ARPHRD_FDDI     774             /* Fiber Distributed Data Interface. */
 113 #define ARPHRD_BIF      775             /* AP1000 BIF.  */
 114 #define ARPHRD_SIT      776             /* sit0 device - IPv6-in-IPv4.  */
 115 #define ARPHRD_IPDDP    777             /* IP-in-DDP tunnel.  */
 116 #define ARPHRD_IPGRE    778             /* GRE over IP.  */
 117 #define ARPHRD_PIMREG   779             /* PIMSM register interface.  */
 118 #define ARPHRD_HIPPI    780             /* High Performance Parallel I'face. */
 119 #define ARPHRD_ASH      781             /* (Nexus Electronics) Ash.  */
 120 #define ARPHRD_ECONET   782             /* Acorn Econet.  */
 121 #define ARPHRD_IRDA     783             /* Linux-IrDA.  */
 122 #define ARPHRD_FCPP     784             /* Point to point fibrechanel.  */
 123 #define ARPHRD_FCAL     785             /* Fibrechanel arbitrated loop.  */
 124 #define ARPHRD_FCPL     786             /* Fibrechanel public loop.  */
 125 #define ARPHRD_FCFABRIC 787             /* Fibrechanel fabric.  */
 126 #define ARPHRD_IEEE802_TR 800           /* Magic type ident for TR.  */
 127 #define ARPHRD_IEEE80211 801            /* IEEE 802.11.  */
 128 #define ARPHRD_IEEE80211_PRISM 802      /* IEEE 802.11 + Prism2 header.  */
 129 #define ARPHRD_IEEE80211_RADIOTAP 803   /* IEEE 802.11 + radiotap header.  */
 130 #define ARPHRD_IEEE802154 804           /* IEEE 802.15.4 header.  */
 131 #define ARPHRD_IEEE802154_PHY 805       /* IEEE 802.15.4 PHY header.  */
 132
 133 #define ARPHRD_VOID       0xFFFF        /* Void type, nothing is known.  */
 134 #define ARPHRD_NONE       0xFFFE        /* Zero header length.  */
 135
 136
 137 /* ARP ioctl request.  */
 138 struct arpreq
 139   {
 140     struct sockaddr arp_pa;             /* Protocol address.  */
 141     struct sockaddr arp_ha;             /* Hardware address.  */
 142     int arp_flags;                      /* Flags.  */
 143     struct sockaddr arp_netmask;        /* Netmask (only for proxy arps).  */
 144     char arp_dev[16];
 145   };
 146
 147 struct arpreq_old
 148   {
 149     struct sockaddr arp_pa;             /* Protocol address.  */
 150     struct sockaddr arp_ha;             /* Hardware address.  */
 151     int arp_flags;                      /* Flags.  */
 152     struct sockaddr arp_netmask;        /* Netmask (only for proxy arps).  */
 153   };
 154
 155 /* ARP Flag values.  */
 156 #define ATF_COM         0x02            /* Completed entry (ha valid).  */
 157 #define ATF_PERM        0x04            /* Permanent entry.  */
 158 #define ATF_PUBL        0x08            /* Publish entry.  */
 159 #define ATF_USETRAILERS 0x10            /* Has requested trailers.  */
 160 #define ATF_NETMASK     0x20            /* Want to use a netmask (only
 161                                            for proxy entries).  */
 162 #define ATF_DONTPUB     0x40            /* Don't answer this addresses.  */
 163 #define ATF_MAGIC       0x80            /* Automatically added entry.  */
 164
 165
 166 /* Support for the user space arp daemon, arpd.  */
 167 #define ARPD_UPDATE     0x01
 168 #define ARPD_LOOKUP     0x02
 169 #define ARPD_FLUSH      0x03
 170
 171 struct arpd_request
 172   {
 173     unsigned short int req;             /* Request type.  */
 174     uint32_t ip;                        /* IP address of entry.  */
 175     unsigned long int dev;              /* Device entry is tied to.  */
 176     unsigned long int stamp;
 177     unsigned long int updated;
 178     unsigned char ha[MAX_ADDR_LEN];     /* Hardware address.  */
 179   };
 180
 181 __END_DECLS
 182
 183 #endif  /* net/if_arp.h */