The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/modules/netgraph/tee/ng_tee.4

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    1 .\" Copyright (c) 1996-1999 Whistle Communications, Inc.
    2 .\" All rights reserved.
    3 .\" 
    4 .\" Subject to the following obligations and disclaimer of warranty, use and
    5 .\" redistribution of this software, in source or object code forms, with or
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   11 .\"    Communications, Inc. trademarks, including the mark "WHISTLE
   12 .\"    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   13 .\"    such appears in the above copyright notice or in the software.
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   15 .\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   16 .\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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   22 .\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   23 .\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   24 .\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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   32 .\" 
   33 .\" Author: Archie Cobbs <archie@freebsd.org>
   34 .\"
   35 .\" $FreeBSD: stable/3/sys/modules/netgraph/tee/ng_tee.4 67528 2000-10-24 22:35:27Z julian $
   36 .\" $Whistle: ng_tee.8,v 1.4 1999/01/25 23:46:27 archie Exp $
   37 .\"
   38 .Dd January 19, 1999
   39 .Dt NG_TEE 4
   40 .Os FreeBSD
   41 .Sh NAME
   42 .Nm ng_tee
   43 .Nd netgraph ``tee'' node type
   44 .Sh SYNOPSIS
   45 .Fd #include <netgraph/ng_tee.h>
   46 .Sh DESCRIPTION
   47 The
   48 .Nm tee
   49 node type has a purpose similar to the
   50 .Xr tee 1
   51 command.
   52 .Nm Tee
   53 nodes are useful for debugging or
   54 .Dq snooping
   55 on a connection
   56 between two netgraph nodes.
   57 .Nm Tee
   58 nodes have four hooks,
   59 .Dv right ,
   60 .Dv left ,
   61 .Dv right2left ,
   62 and
   63 .Dv left2right .
   64 All data received on
   65 .Dv right
   66 is sent unmodified to
   67 .Em both
   68 hooks
   69 .Dv left
   70 and
   71 .Dv right2left .
   72 Similarly, all data received on
   73 .Dv left
   74 is sent unmodified to both
   75 .Dv right
   76 and
   77 .Dv left2right .
   78 .Pp
   79 Packets may also be received on
   80 .Dv right2left
   81 and
   82 .Dv left2right ;
   83 if so, they are forwarded unchanged out hooks
   84 .Dv left
   85 and
   86 .Dv right ,
   87 respectively.
   88 .Sh HOOKS
   89 This node type supports the following hooks:
   90 .Pp
   91 .Bl -tag -width foobarbarfoo
   92 .It Dv right
   93 The connection to the node on the right.
   94 .It Dv left
   95 The connection to the node on the left.
   96 .It Dv right2left
   97 Tap for right to left traffic.
   98 .It Dv left2right
   99 Tap for left to right traffic.
  100 .El
  101 .Sh CONTROL MESSAGES
  102 This node type supports the generic control messages, plus the following.
  103 .Bl -tag -width foo
  104 .It Dv NGM_TEE_GET_STATS
  105 Get statistics, returned as a
  106 .Dv "struct ng_tee_stats" .
  107 .It Dv NGM_TEE_CLR_STATS
  108 Clear statistics.
  109 .El
  110 .Sh SHUTDOWN
  111 This node shuts down upon receipt of a
  112 .Dv NGM_SHUTDOWN
  113 control message, or when all hooks have been disconnected.
  114 .Sh SEE ALSO
  115 .Xr tee 1 ,
  116 .Xr netgraph 4 ,
  117 .Xr ngctl 8
  118 .Sh HISTORY
  119 The
  120 .Nm
  121 node type was implemented in
  122 .Fx 4.0 .
  123 .Sh AUTHORS
  124 .An Julian Elischer Aq julian@freebsd.org

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