sysdeps/mach/hurd/net/if_arp.h

   1 /* Definitions for Address Resolution Protocol.
   2    Copyright (C) 1997-2021 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    <https://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
  24 #define _NET_IF_ARP_H 1
  25 #include <sys/cdefs.h>
  26
  27 #include <sys/types.h>
  28 #include <sys/socket.h>
  29 #include <stdint.h>
  30
  31 __BEGIN_DECLS
  32
  33 /* Some internals from deep down in the kernel.  */
  34 #define MAX_ADDR_LEN    7
  35
  36
  37 /* This structure defines an ethernet arp header.  */
  38
  39 /* ARP protocol opcodes. */
  40 #define ARPOP_REQUEST   1               /* ARP request.  */
  41 #define ARPOP_REPLY     2               /* ARP reply.  */
  42 #define ARPOP_RREQUEST  3               /* RARP request.  */
  43 #define ARPOP_RREPLY    4               /* RARP reply.  */
  44
  45 /* See RFC 826 for protocol description.  ARP packets are variable
  46    in size; the arphdr structure defines the fixed-length portion.
  47    Protocol type values are the same as those for 10 Mb/s Ethernet.
  48    It is followed by the variable-sized fields ar_sha, arp_spa,
  49    arp_tha and arp_tpa in that order, according to the lengths
  50    specified.  Field names used correspond to RFC 826.  */
  51
  52 struct arphdr
  53   {
  54     unsigned short int ar_hrd;          /* Format of hardware address.  */
  55     unsigned short int ar_pro;          /* Format of protocol address.  */
  56     unsigned char ar_hln;               /* Length of hardware address.  */
  57     unsigned char ar_pln;               /* Length of protocol address.  */
  58     unsigned short int ar_op;           /* ARP opcode (command).  */
  59 #if 0
  60     /* Ethernet looks like this : This bit is variable sized
  61        however...  */
  62     unsigned char __ar_sha[ETH_ALEN];   /* Sender hardware address.  */
  63     unsigned char __ar_sip[4];          /* Sender IP address.  */
  64     unsigned char __ar_tha[ETH_ALEN];   /* Target hardware address.  */
  65     unsigned char __ar_tip[4];          /* Target IP address.  */
  66 #endif
  67   };
  68
  69
  70 /* ARP protocol HARDWARE identifiers. */
  71 #define ARPHRD_NETROM   0               /* From KA9Q: NET/ROM pseudo. */
  72 #define ARPHRD_ETHER    1               /* Ethernet 10Mbps.  */
  73 #define ARPHRD_EETHER   2               /* Experimental Ethernet.  */
  74 #define ARPHRD_AX25     3               /* AX.25 Level 2.  */
  75 #define ARPHRD_PRONET   4               /* PROnet token ring.  */
  76 #define ARPHRD_CHAOS    5               /* Chaosnet.  */
  77 #define ARPHRD_IEEE802  6               /* IEEE 802.2 Ethernet/TR/TB.  */
  78 #define ARPHRD_ARCNET   7               /* ARCnet.  */
  79 #define ARPHRD_APPLETLK 8               /* APPLEtalk.  */
  80 #define ARPHRD_DLCI     15              /* Frame Relay DLCI.  */
  81 #define ARPHRD_METRICOM 23              /* Metricom STRIP (new IANA id).  */
  82
  83 /* Dummy types for non ARP hardware */
  84 #define ARPHRD_SLIP     256
  85 #define ARPHRD_CSLIP    257
  86 #define ARPHRD_SLIP6    258
  87 #define ARPHRD_CSLIP6   259
  88 #define ARPHRD_RSRVD    260             /* Notional KISS type.  */
  89 #define ARPHRD_ADAPT    264
  90 #define ARPHRD_ROSE     270
  91 #define ARPHRD_X25      271             /* CCITT X.25.  */
  92 #define ARPHRD_PPP      512
  93 #define ARPHRD_HDLC     513             /* (Cisco) HDLC.  */
  94 #define ARPHRD_LAPB     516             /* LAPB.  */
  95
  96 #define ARPHRD_TUNNEL   768             /* IPIP tunnel.  */
  97 #define ARPHRD_TUNNEL6  769             /* IPIP6 tunnel.  */
  98 #define ARPHRD_FRAD     770             /* Frame Relay Access Device.  */
  99 #define ARPHRD_SKIP     771             /* SKIP vif.  */
 100 #define ARPHRD_LOOPBACK 772             /* Loopback device.  */
 101 #define ARPHRD_LOCALTLK 773             /* Localtalk device.  */
 102 #define ARPHRD_FDDI     774             /* Fiber Distributed Data Interface. */
 103 #define ARPHRD_BIF      775             /* AP1000 BIF.  */
 104 #define ARPHRD_SIT      776             /* sit0 device - IPv6-in-IPv4.  */
 105
 106
 107 /* ARP ioctl request.  */
 108 struct arpreq
 109   {
 110     struct sockaddr arp_pa;             /* Protocol address.  */
 111     struct sockaddr arp_ha;             /* Hardware address.  */
 112     int arp_flags;                      /* Flags.  */
 113     struct sockaddr arp_netmask;        /* Netmask (only for proxy arps).  */
 114     char arp_dev[16];
 115   };
 116
 117 /* ARP Flag values.  */
 118 #define ATF_COM         0x02            /* Completed entry (ha valid).  */
 119 #define ATF_PERM        0x04            /* Permanent entry.  */
 120 #define ATF_PUBL        0x08            /* Publish entry.  */
 121 #define ATF_USETRAILERS 0x10            /* Has requested trailers.  */
 122 #define ATF_NETMASK     0x20            /* Want to use a netmask (only
 123                                            for proxy entries).  */
 124 #define ATF_DONTPUB     0x40            /* Don't answer this addresses.  */
 125 #define ATF_MAGIC       0x80            /* Automatically added entry.  */
 126
 127
 128 /* Support for the user space arp daemon, arpd.  */
 129 #define ARPD_UPDATE     0x01
 130 #define ARPD_LOOKUP     0x02
 131 #define ARPD_FLUSH      0x03
 132
 133 struct arpd_request
 134   {
 135     unsigned short int req;             /* Request type.  */
 136     uint32_t ip;                        /* IP address of entry.  */
 137     unsigned long int dev;              /* Device entry is tied to.  */
 138     unsigned long int stamp;
 139     unsigned long int updated;
 140     unsigned char ha[MAX_ADDR_LEN];     /* Hardware address.  */
 141   };
 142
 143 __END_DECLS
 144
 145 #endif  /* net/if_arp.h */