157 lines
4.9 KiB
Groff
157 lines
4.9 KiB
Groff
.\"
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.\" Copyright (c) 2001-2003
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.\" Fraunhofer Institute for Open Communication Systems (FhG Fokus).
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.\" 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.\" Author: Hartmut Brandt <harti@freebsd.org>
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.\"
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.\" $FreeBSD$
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.\"
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.\" ng_sscfu(4) man page
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.\"
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.Dd October 24, 2003
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.Dt NG_SSCFU 4
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.Os
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.Sh NAME
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.Nm ng_sscfu
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.Nd netgraph SSCF at the UNI node type
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.Sh SYNOPSIS
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.Fd #include <netnatm/saal/sscopdef.h>
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.Fd #include <netnatm/saal/sscfudef.h>
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.Fd #include <netgraph/atm/ng_sscfu.h>
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.Sh DESCIPTION
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The
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.Nm
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netgraph node implements ITU-T recommendation Q.2130.
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This recommendation specifies the Service Specific Coordination
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Function at the UNI.
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This is a thin sub-layer between the SSCOP (see
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.Xr ng_sscop 4 )
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and the UNI signalling.
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This node does not really implement a protocol but
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provides a mapping between the signals at the upper layer of the SSCOP and
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the signals, the UNI expects at its lower layer.
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It also provides default values for the parameters of the SSCOP.
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.Pp
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After creation of the node, the SSCF instance must be created by sending
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an enable message to the node.
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If the node is enabled, default SSCOP parameters
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can be retrieved and and set in the corresponding SSCOP instance.
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.Pp
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The node is shutdown either by a
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.Dv NGM_SHUTDOWN
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message or when all hooks are disconnected.
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.Sh HOOKS
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Each
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.Nm
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node has two hooks with fixed names:
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.Bl -tag -width upper
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.It Dv lower
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This hook is the interface to the SSCOP.
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The interface expected here is exactly
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that which is exported by the
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.Xr ng_sscop 4
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node type.
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.It Dv upper
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This is the interface to the UNI.
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It uses the following message format:
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.Bd -literal
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struct sscfu_arg {
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uint32_t sig;
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u_char data[];
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};
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.Ed
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.Pp
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.Fa sig
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is one of the following signals:
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.Bd -literal
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enum saal_sig {
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SAAL_ESTABLISH_request, /* U -> SAAL: (UU) */
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SAAL_ESTABLISH_indication, /* SAAL -> U: (UU) */
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SAAL_ESTABLISH_confirm, /* SAAL -> U: (UU) */
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SAAL_RELEASE_request, /* U -> SAAL: (UU) */
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SAAL_RELEASE_confirm, /* SAAL -> U: */
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SAAL_RELEASE_indication, /* SAAL -> U: (UU) */
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SAAL_DATA_request, /* U -> SAAL: (DATA) */
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SAAL_DATA_indication, /* SAAL -> U: (DATA) */
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SAAL_UDATA_request, /* U -> SAAL: (UDATA) */
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SAAL_UDATA_indication, /* SAAL -> U: (UDATA) */
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};
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.Ed
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.Pp
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The arrows in the comment show the direction of the signal whether it
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is a signal that comes out of the node
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.Ql ->
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or is sent by the node user to the node
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.Ql <- .
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The type of data expected for the signal is specified in parentheses.
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This data starts at the
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.Fa data
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field of the message structure.
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.El
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.Pp
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If the
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.Dv lower
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hook is disconnected and the node is enabled, the protocol state is
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reset.
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.Sh CONTROL MESSAGES
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The
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.Nm
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node understands the generic messages plus the following:
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.Bl -tag -width xxx
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.It Dv NGM_SSCFU_GETDEFPARAM
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This message returns a
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.Fa sscop_param
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structure, which contains the default parameters for the SSCOP at the
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UNI.
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This structure should be used for a
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.Dv NGM_SSCOP_SETPARAM
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message to the SSCOP node below the SSCF.
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.It Dv NGM_SSCFU_ENABLE
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This message creates the actual SSCF instance and initializes it.
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Until this is done, parameters may not be retrieved not set and all message
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received on any hook are discarded.
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.It Dv NGM_SSCFU_DISABLE
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Destroy the SSCF instance.
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After this all messages on any hooks are discarded.
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.It Dv NGM_SSCFU_GETDEBUG
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Retrieve the debugging flags in an
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.Vt uint32_t .
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.It Dv NGM_SSCFU_SETDEBUG
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Set debugging flags.
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The argument must be an
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.Vt uint32_t .
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.It Dv NGM_SSCFU_GETSTATE
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Retrieve the current state of the SSCFU instance in an
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.Vt uint32_t .
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If the node has not been enabled, 0 is returned.
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.El
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.Sh SEE ALSO
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.Xr netgraph 4 ,
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.Xr ng_atm 4 ,
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.Xr ng_sscop 4 ,
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.Xr ngctl 8
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.Sh AUTHORS
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.An Harti Brandt Aq harti@freebsd.org
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