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
6.\" without modifications are expressly permitted by Whistle Communications;
7.\" provided, however, that:
8.\" 1. Any and all reproductions of the source or object code must include the

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29.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
31.\" OF SUCH DAMAGE.
32.\"
33.\" Authors: Julian Elischer <julian@FreeBSD.org>
34.\" Archie Cobbs <archie@FreeBSD.org>
35.\"
36.\" $Whistle: netgraph.4,v 1.7 1999/01/28 23:54:52 julian Exp $
37.\" $FreeBSD: head/share/man/man4/netgraph.4 179315 2008-05-26 10:40:09Z bz $
38.\"
39.Dd May 25, 2008
40.Dt NETGRAPH 4
41.Os
42.Sh NAME
43.Nm netgraph
44.Nd "graph based kernel networking subsystem"
45.Sh DESCRIPTION
46The
47.Nm

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684C and D.
685The nodes would use
686.Em "direct hook pointer"
687addressing to route the messages.
688The message may have travelled from
689.Dq Li Frame1:
690to B
691as a synchronous reply, saving time and cycles.
692.Ss Netgraph Structures
693Structures are defined in
694.In netgraph/netgraph.h
695(for kernel structures only of interest to nodes)
696and
697.In netgraph/ng_message.h
698(for message definitions also of interest to user programs).
699.Pp

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