189 lines
5.6 KiB
Groff
189 lines
5.6 KiB
Groff
.\" $NetBSD: iso.4,v 1.3 1994/11/30 16:22:20 jtc Exp $
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.\"
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.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)iso.4 8.2 (Berkeley) 11/30/93
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.\"
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.Dd November 30, 1993
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.Dt ISO 4
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.Os
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.Sh NAME
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.Nm iso
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.Nd
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.Tn ISO
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protocol family
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <netiso/iso.h>
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.Sh DESCRIPTION
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The
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.Tn ISO
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protocol family is a collection of protocols
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that uses the
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.Tn ISO
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address format.
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The
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.Tn ISO
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family provides protocol support for the
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.Dv SOCK_SEQPACKET
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abstraction through the
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.Tn TP
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protocol
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.Pf ( Tn ISO
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8073),
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for the
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.Dv SOCK_DGRAM
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abstraction through the connectionless transport
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protocol
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.Pf ( Tn ISO
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8602),
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and for the
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.Dv SOCK_RAW
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abstraction
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by providing direct access (for debugging) to the
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.Tn CLNP
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.Pf ( Tn ISO
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8473) network layer protocol.
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.Sh ADDRESSING
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.Tn ISO
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addresses are based upon
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.Tn ISO
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8348/AD2,
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.%T "Addendum to the Network Service Definition Covering Network Layer Addressing."
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.Pp
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Sockets bound to the OSI protocol family use
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the following address structure:
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.Bd -literal
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struct iso_addr {
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u_char isoa_len; /* length, not including this byte */
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char isoa_genaddr[20]; /* general opaque address */
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};
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struct sockaddr_iso {
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u_char siso_len; /* size of this sockaddr */
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u_char siso_family; /* addressing domain, AF_ISO */
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u_char siso_plen; /* presentation selector length */
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u_char siso_slen; /* session selector length */
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u_char siso_tlen; /* transport selector length */
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struct iso_addr siso_addr; /* network address */
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u_char siso_pad[6]; /* space for gosip v2 SELs */
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};
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#define siso_nlen siso_addr.isoa_len
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#define siso_data siso_addr.isoa_genaddr
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.Ed
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.Pp
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The fields of this structure are:
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.Bl -tag -width Ds
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.It Ar siso_len:
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Length of the entire address structure, in bytes, which may grow to
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be longer than the 32 bytes shown above.
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.It Ar siso_family:
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Identifies the domain:
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.Dv AF_ISO .
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.It Ar siso_tlen:
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Length of the transport selector.
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.It Ar siso_slen:
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Length of the session selector.
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This is not currently supported by the kernel and is provided as
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a convenience for user level programs.
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.It Ar siso_plen:
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Length of the presentation selector.
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This is not currently supported by the kernel and is provided as
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a convenience for user level programs.
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.It Ar siso_addr:
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The network part of the address, described below.
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.El
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.Sh TRANSPORT ADDRESSING
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.Pp
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An
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.Tn ISO
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transport address is similar to an Internet address in that
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it contains a network-address portion and a portion that the
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transport layer uses to multiplex its services among clients.
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In the Internet domain, this portion of the address is called a
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.Em port .
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In the
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.Tn ISO
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domain, this is called a
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.Em transport selector
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(also known at one time as a
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.Em transport suffix ) .
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While ports are always 16 bits,
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transport selectors may be
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of (almost) arbitrary size.
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.Pp
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Since the C language does not provide convenient variable
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length structures, we have separated the selector lengths
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from the data themselves.
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The network address and various selectors are stored contiguously,
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with the network address first, then the transport selector, and so
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on. Thus, if you had a nework address of less then 20 bytes,
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the transport selector would encroach on space normally reserved
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for the network address.
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.Pp
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.Sh NETWORK ADDRESSING.
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.Tn ISO
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network addresses are limited to 20 bytes in length.
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.Tn ISO
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network addresses can take any format.
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.Sh PROTOCOLS
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The
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.Tn ARGO
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1.0 implementation of the
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.Tn ISO
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protocol family comprises
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the Connectionless-Mode Network Protocol
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.Pq Tn CLNP ,
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and the Transport Protocol
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.Pq Tn TP ,
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classes 4 and 0,
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and
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.Tn X.25 .
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.Tn TP
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is used to support the
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.Dv SOCK_SEQPACKET
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abstraction.
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A raw interface to
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.Tn CLNP
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is available
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by creating an
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.Tn ISO
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socket of type
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.Dv SOCK_RAW .
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This is used for
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.Tn CLNP
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debugging only.
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.Sh SEE ALSO
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.Xr tp 4 ,
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.Xr clnp 4 ,
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.Xr cltp 4
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