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1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
188 lines
5.6 KiB
Groff
188 lines
5.6 KiB
Groff
.\" 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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.\" $FreeBSD$
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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 network 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 clnp 4 ,
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.Xr cltp 4 ,
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.Xr tp 4
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