aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/unix/sysv/linux/net/if_arp.h
blob: b1cd18360ec40f553545af2192e748f741f0d937 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/* Definitions for Address Resolution Protocol.
   Copyright (C) 1997 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  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.  */

/* 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 10Mbps.  */
#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_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 ARPHRD_PPP	512

#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.  */


/* 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 */