ISO
Section: Devices and Network Interfaces (4)
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NAME
iso
- ISO
protocol family
SYNOPSIS
Fd #include <sys/types.h>
Fd #include <netiso/iso.h>
DESCRIPTION
The
ISO
protocol family is a collection of protocols
that uses the
ISO
address format.
The
ISO
family provides protocol support for the
SOCK_SEQPACKET
abstraction through the
TP
protocol
( ISO
8073),
for the
SOCK_DGRAM
abstraction through the connectionless transport
protocol
( ISO
8602),
and for the
SOCK_RAW
abstraction
by providing direct access (for debugging) to the
CLNP
( ISO
8473) network layer protocol.
ADDRESSING
ISO
addresses are based upon
ISO
8348/AD2,
"Addendum to the Network Service Definition Covering Network Layer Addressing."
Sockets bound to the OSI protocol family use
the following address structure:
struct iso_addr {
u_char isoa_len; /* length, not including this byte */
char isoa_genaddr[20]; /* general opaque address */
};
struct sockaddr_iso {
u_char siso_len; /* size of this sockaddr */
u_char siso_family; /* addressing domain, AF_ISO */
u_char siso_plen; /* presentation selector length */
u_char siso_slen; /* session selector length */
u_char siso_tlen; /* transport selector length */
struct iso_addr siso_addr; /* network address */
u_char siso_pad[6]; /* space for gosip v2 SELs */
};
#define siso_nlen siso_addr.isoa_len
#define siso_data siso_addr.isoa_genaddr
The fields of this structure are:
- siso_len:
-
Length of the entire address structure, in bytes, which may grow to
be longer than the 32 bytes show above.
- siso_family:
-
Identifies the domain:
AF_ISO
- siso_tlen:
-
Length of the transport selector.
- siso_slen:
-
Length of the session selector.
This is not currently supported by the kernel and is provided as
a convenience for user level programs.
- siso_plen:
-
Length of the presentation selector.
This is not currently supported by the kernel and is provided as
a convenience for user level programs.
- siso_addr:
-
The network part of the address, described below.
TRANSPORT ADDRESSING
An
ISO
transport address is similar to an Internet address in that
it contains a network-address portion and a portion that the
transport layer uses to multiplex its services among clients.
In the Internet domain, this portion of the address is called a
port
In the
ISO
domain, this is called a
transport selector
(also known at one time as a
transport suffix )
While ports are always 16 bits,
transport selectors may be
of (almost) arbitrary size.
Since the C language does not provide conveninent variable
length structures, we have separated the selector lengths
from the data themselves.
The network address and various selectors are stored contiguously,
with the network address first, then the transport selector, and so
on. Thus, if you had a nework address of less then 20 bytes,
the transport selector would encroach on space normally reserved
for the network address.
NETWORK ADDRESSING.
ISO
network addresses are limited to 20 bytes in length.
ISO
network addresses can take any format.
PROTOCOLS
The
ARGO
1.0 implementation of the
ISO
protocol family comprises
the Connectionless-Mode Network Protocol
(CLNP ,
)
and the Transport Protocol
(TP
)
classes 4 and 0,
and
X.25
TP
is used to support the
SOCK_SEQPACKET
abstraction.
A raw interface to
CLNP
is available
by creating an
ISO
socket of type
SOCK_RAW
This is used for
CLNP
debugging only.
SEE ALSO
tp(4),
clnp(4),
cltp(4)
HISTORY
The
protocol family implementation
Ud
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- ADDRESSING
-
- TRANSPORT ADDRESSING
-
- NETWORK ADDRESSING.
-
- PROTOCOLS
-
- SEE ALSO
-
- HISTORY
-
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Time: 06:48:46 GMT, May 19, 2025