156 lines
4.9 KiB
Groff
156 lines
4.9 KiB
Groff
.\"
|
|
.\" Copyright (c) 2001-2003
|
|
.\" Fraunhofer Institute for Open Communication Systems (FhG Fokus).
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" Author: Hartmut Brandt <harti@freebsd.org>
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.\" ng_sscfu(4) man page
|
|
.\"
|
|
.Dd October 24, 2003
|
|
.Dt ng_sscfu 4
|
|
.Os FreeBSD
|
|
.Sh NAME
|
|
.Nm ng_sscfu
|
|
.Nd netgraph SSCF at the UNI node type
|
|
.Sh SYNOPSIS
|
|
.Fd #include <netnatm/saal/sscopdef.h>
|
|
.Fd #include <netnatm/saal/sscfudef.h>
|
|
.Fd #include <netgraph/atm/ng_sscfu.h>
|
|
.Sh DESCIPTION
|
|
The
|
|
.Nm
|
|
netgraph node implements ITU-T recommendation Q.2130.
|
|
This recommendation specifies the Service Specific Coordination
|
|
Function at the UNI.
|
|
This is a thin sub-layer between the SSCOP (see
|
|
.Xr ng_sscop 4 )
|
|
and the UNI signalling.
|
|
This node does not really implement a protocol but
|
|
provides a mapping between the signals at the upper layer of the SSCOP and
|
|
the signals, the UNI expectes at its lower layer.
|
|
It also provides default values for the parameters of the SSCOP.
|
|
.Pp
|
|
After creation of the node, the SSCF instance must be created by sending
|
|
an enable message to the node.
|
|
If the node is enabled, default SSCOP parameters
|
|
can be retrieved and and set in the corresponding SSCOP instance.
|
|
.Pp
|
|
The node is shutdown either by a
|
|
.Dv NGM_SHUTDOWN
|
|
message or when all hooks are disconnected.
|
|
.Sh HOOKS
|
|
Each
|
|
.Nm
|
|
node has two hooks with fixed names:
|
|
.Bl -tag -width upper
|
|
.It Dv lower
|
|
This hook is the interface to the SSCOP.
|
|
The interface expected here is exactly
|
|
that which is exported by the
|
|
.Xr ng_sscop 4
|
|
node type.
|
|
.It Dv upper
|
|
This is the interface to the UNI. It uses the following message format:
|
|
.Bd -literal
|
|
struct sscfu_arg {
|
|
uint32_t sig;
|
|
u_char data[];
|
|
};
|
|
.Ed
|
|
.Pp
|
|
.Fa sig
|
|
is one of the following signals:
|
|
.Bd -literal
|
|
enum saal_sig {
|
|
SAAL_ESTABLISH_request, /* U -> SAAL: (UU) */
|
|
SAAL_ESTABLISH_indication, /* SAAL -> U: (UU) */
|
|
SAAL_ESTABLISH_confirm, /* SAAL -> U: (UU) */
|
|
SAAL_RELEASE_request, /* U -> SAAL: (UU) */
|
|
SAAL_RELEASE_confirm, /* SAAL -> U: */
|
|
SAAL_RELEASE_indication, /* SAAL -> U: (UU) */
|
|
SAAL_DATA_request, /* U -> SAAL: (DATA) */
|
|
SAAL_DATA_indication, /* SAAL -> U: (DATA) */
|
|
SAAL_UDATA_request, /* U -> SAAL: (UDATA) */
|
|
SAAL_UDATA_indication, /* SAAL -> U: (UDATA) */
|
|
};
|
|
.Ed
|
|
.Pp
|
|
The arrows in the comment show the direction of the signal whether it
|
|
is a signal that comes out of the node
|
|
.Ql ->
|
|
or is sent by the node user to the node
|
|
.Ql <- .
|
|
The type of data expected for the signal is specified in parantheses.
|
|
This data starts at the
|
|
.Fa data
|
|
field of the message structure.
|
|
.El
|
|
.Pp
|
|
If the
|
|
.Dv lower
|
|
hook is disconnected and the node is enabled, the protocol state is
|
|
reset.
|
|
.Sh CONTROL MESSAGES
|
|
The
|
|
.Nm
|
|
node understands the generic messages plus the following:
|
|
.Bl -tag -width xxx
|
|
.It Dv NGM_SSCFU_GETDEFPARAM
|
|
This message returns a
|
|
.Fa sscop_param
|
|
structure, which contains the default parameters for the SSCOP at the
|
|
UNI.
|
|
This structure should be used for a
|
|
.Dv NGM_SSCOP_SETPARAM
|
|
message to the SSCOP node below the SSCF.
|
|
.It Dv NGM_SSCFU_ENABLE
|
|
This message creates the actual SSCF instance and initializes it.
|
|
Until this is done, parameters may not be retrieved not set and all message
|
|
received on any hook are discarded.
|
|
.It Dv NGM_SSCFU_DISABLE
|
|
Destroy the SSCF instance.
|
|
After this all messages on any hooks are discarded.
|
|
.It Dv NGM_SSCFU_GETDEBUG
|
|
Retrieve the debugging flags in an
|
|
.Vt uint32_t .
|
|
.It Dv NGM_SSCFU_SETDEBUG
|
|
Set debugging flags.
|
|
The argument must be an
|
|
.Vt uint32_t .
|
|
.It Dv NGM_SSCFU_GETSTATE
|
|
Retrieve the current state of the SSCFU instance in an
|
|
.Vt uint32_t .
|
|
If the node has not been enabled, 0 is returned.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr netgraph 4 ,
|
|
.Xr ng_atm 4 ,
|
|
.Xr ng_sscop 4 ,
|
|
.Xr ngctl 8
|
|
.Sh AUTHORS
|
|
.An Harti Brandt Aq harti@freebsd.org
|