mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
128 lines
3.6 KiB
Groff
128 lines
3.6 KiB
Groff
.\" Copyright 2000 The Aerospace Corporation. 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.
|
|
.\" 3. The name of The Aerospace Corporation may not be used to endorse or
|
|
.\" promote products derived from this software.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION "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 AEROSPACE CORPORATION 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: Brooks Davis <brooks@FreeBSD.org>
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd September 18, 2001
|
|
.Dt NG_GIF 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm ng_gif
|
|
.Nd generic tunnel interface netgraph node type
|
|
.Sh SYNOPSIS
|
|
.In netgraph/ng_gif.h
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
netgraph node type allows
|
|
.Xr gif 4
|
|
interfaces to interact with
|
|
the
|
|
.Xr netgraph 4
|
|
networking subsystem.
|
|
Once the
|
|
.Nm
|
|
module is loaded in the kernel, a node is automatically created
|
|
for each
|
|
.Xr gif 4
|
|
interface in the system.
|
|
Each node will attempt to name itself with the same name
|
|
as the associated interface.
|
|
All
|
|
.Nm
|
|
nodes are persistent for as long as the interface itself exists.
|
|
.Pp
|
|
Two hooks are supported:
|
|
.Dv lower
|
|
and
|
|
.Dv orphans .
|
|
The hook name
|
|
.Dv divert
|
|
may be used as an alias for
|
|
.Dv lower ,
|
|
and is provided for compatibility with
|
|
.Xr ng_ether 4 .
|
|
In reality the two names represent the same hook.
|
|
.Pp
|
|
The
|
|
.Dv lower
|
|
hook is a connection to the raw
|
|
.Xr gif 4
|
|
device.
|
|
When connected, all incoming packets are diverted out this hook.
|
|
Writing to this hook results in a raw encapsulated packet being transmitted
|
|
by the device.
|
|
Normal outgoing packets are not affected by
|
|
.Dv lower
|
|
being connected.
|
|
.Pp
|
|
The
|
|
.Dv orphans
|
|
hook is equivalent to
|
|
.Dv lower ,
|
|
except that only unrecognized packets (that would otherwise be discarded)
|
|
are written to the hook, and normal incoming traffic is unaffected.
|
|
At most one of
|
|
.Dv orphans
|
|
and
|
|
.Dv lower
|
|
may be connected at any time.
|
|
.Pp
|
|
In all cases, frames are raw packets with the address family of the
|
|
packet attached to the front.
|
|
.Pp
|
|
When no hooks are connected, packets flow normally upwards and downwards.
|
|
.Sh HOOKS
|
|
This node type supports the following hooks:
|
|
.Pp
|
|
.Bl -tag -width ".Dv orphans"
|
|
.It Dv lower
|
|
Connection to the lower device link layer.
|
|
.It Dv orphans
|
|
Like
|
|
.Dv lower ,
|
|
but only receives unrecognized packets.
|
|
.El
|
|
.Sh CONTROL MESSAGES
|
|
This node type supports only the generic control messages.
|
|
.Sh EXAMPLES
|
|
This command dumps all unrecognized packets received by the
|
|
.Li gif0
|
|
interface to standard output decoded in hex and ASCII:
|
|
.Pp
|
|
.Dl "nghook -a gif0: orphans"
|
|
.Sh SEE ALSO
|
|
.Xr gif 4 ,
|
|
.Xr netgraph 4 ,
|
|
.Xr netintro 4 ,
|
|
.Xr ifconfig 8 ,
|
|
.Xr ngctl 8 ,
|
|
.Xr nghook 8
|
|
.Sh AUTHORS
|
|
.An Brooks Davis Aq brooks@FreeBSD.org
|