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.\" Author: Julian Elischer <julian@FreeBSD.org>
.\"
.\" $FreeBSD: releng/12.0/share/man/man4/ng_split.4 267938 2014-06-26 21:46:14Z bapt $
.\"
.Dd February 19, 2001
.Dt NG_SPLIT 4
.Os
.Sh NAME
.Nm ng_split
.Nd netgraph node to separate incoming and outgoing flows
.Sh SYNOPSIS
.In netgraph/ng_split.h
.Sh DESCRIPTION
The
.Nm split
node type is used to split a bidirectional stream of packets into
two separate unidirectional streams of packets.
.Sh HOOKS
This node type supports the following three hooks:
.Bl -tag -width ".Va mixed"
.It Va in
Packets received on
.Em in
are forwarded to
.Em mixed .
.It Va out
Packets received on
.Em out
will be discarded as illegal.
.It Va mixed
Packets received on
.Em mixed
are forwarded to
.Em out .
.El
.Sh CONTROL MESSAGES
This node type supports only the generic control messages.
.Sh SHUTDOWN
This node shuts down upon receipt of a
.Dv NGM_SHUTDOWN
control message, or when all hooks have been disconnected.
.Sh SEE ALSO
.Xr netgraph 4 ,
.Xr ngctl 8
.Sh HISTORY
The
.Nm
node type was implemented in
.Fx 3.5
but incorporated into
.Fx
in
.Fx 5.0 .
.Sh AUTHORS
.An Julian Elischer Aq Mt julian@FreeBSD.org
.An Vitaly V. Belekhov Aq Mt vitaly@riss-telecom.ru