14e22ae790
behaviour lost in the change from 4.x style netgraph tee nodes. Alter the tee node to use the new method. Document the behaviour. Step the ABI version number... old netgraph klds will refuse to load. Better than just crashing. Submitted by: Gleb Smirnoff <glebius@cell.sick.ru>
135 lines
3.8 KiB
Groff
135 lines
3.8 KiB
Groff
.\" Copyright (c) 1996-1999 Whistle Communications, Inc.
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.\" All rights reserved.
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.\"
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.\" Subject to the following obligations and disclaimer of warranty, use and
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.\" redistribution of this software, in source or object code forms, with or
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.\" without modifications are expressly permitted by Whistle Communications;
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.\" provided, however, that:
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.\" 1. Any and all reproductions of the source or object code must include the
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.\" copyright notice above and the following disclaimer of warranties; and
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.\" 2. No rights are granted, in any manner or form, to use Whistle
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.\" Communications, Inc. trademarks, including the mark "WHISTLE
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.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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.\" such appears in the above copyright notice or in the software.
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.\"
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.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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.\" OF SUCH DAMAGE.
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.\"
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.\" Author: Archie Cobbs <archie@FreeBSD.org>
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.\"
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.\" $FreeBSD$
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.\" $Whistle: ng_tee.8,v 1.4 1999/01/25 23:46:27 archie Exp $
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.\"
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.Dd May 28, 2004
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.Dt NG_TEE 4
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.Os
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.Sh NAME
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.Nm ng_tee
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.Nd netgraph ``tee'' node type
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.Sh SYNOPSIS
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.In netgraph/ng_tee.h
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.Sh DESCRIPTION
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The
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.Nm tee
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node type has a purpose similar to the
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.Xr tee 1
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command.
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.Nm Tee
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nodes are useful for debugging or
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.Dq snooping
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on a connection
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between two netgraph nodes.
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.Nm Tee
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nodes have four hooks,
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.Dv right ,
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.Dv left ,
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.Dv right2left ,
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and
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.Dv left2right .
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All data received on
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.Dv right
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is sent unmodified to
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.Em both
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hooks
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.Dv left
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and
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.Dv right2left .
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Similarly, all data received on
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.Dv left
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is sent unmodified to both
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.Dv right
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and
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.Dv left2right .
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.Pp
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Packets may also be received on
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.Dv right2left
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and
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.Dv left2right ;
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if so, they are forwarded unchanged out hooks
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.Dv right
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and
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.Dv left ,
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respectively.
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.Sh HOOKS
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This node type supports the following hooks:
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.Pp
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.Bl -tag -width foobarbarfoo
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.It Dv right
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The connection to the node on the right.
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.It Dv left
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The connection to the node on the left.
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.It Dv right2left
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Tap for right to left traffic.
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.It Dv left2right
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Tap for left to right traffic.
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.El
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.Sh CONTROL MESSAGES
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This node type supports the generic control messages, plus the following.
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.Bl -tag -width foo
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.It Dv NGM_TEE_GET_STATS
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Get statistics, returned as a
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.Dv "struct ng_tee_stats" .
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.It Dv NGM_TEE_CLR_STATS
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Clear statistics.
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.El
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.Sh SHUTDOWN
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This node shuts down upon receipt of an
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.Dv NGM_SHUTDOWN
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control message, or when all hooks have been disconnected.
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If both
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.Dv right
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and
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.Dv left
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hooks are present, node removes itself from the chain gently,
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connecting
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.Dv right
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and
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.Dv left
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together.
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.Sh SEE ALSO
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.Xr tee 1 ,
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.Xr netgraph 4 ,
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.Xr ngctl 8
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.Sh HISTORY
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The
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.Nm
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node type was implemented in
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.Fx 4.0 .
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.Sh AUTHORS
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.An Julian Elischer Aq julian@FreeBSD.org
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