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.\" Copyright (c) 1996-1999 Whistle Communications, Inc.
.\" All rights reserved.
.\"
.\" Subject to the following obligations and disclaimer of warranty, use and
.\" redistribution of this software, in source or object code forms, with or
.\" without modifications are expressly permitted by Whistle Communications;
.\" provided, however, that:
.\" 1. Any and all reproductions of the source or object code must include the
.\" copyright notice above and the following disclaimer of warranties; and
.\" 2. No rights are granted, in any manner or form, to use Whistle
.\" Communications, Inc. trademarks, including the mark "WHISTLE
.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as
.\" such appears in the above copyright notice or in the software.
.\"
.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
.\" OF SUCH DAMAGE.
.\"
.\" Author: Archie Cobbs <archie@whistle.com>
.\"
.\" $FreeBSD$
.\" $Whistle: ng_iface.8,v 1.5 1999/01/25 23:46:26 archie Exp $
.\"
.Dd January 19, 1999
.Dt NG_IFACE 8
.Os FreeBSD 4.0
.Sh NAME
.Nm ng_iface
.Nd interface netgraph node type
.Sh SYNOPSIS
.Fd #include <netgraph/ng_iface.h>
.Sh DESCRIPTION
An
.Nm iface
node is both a netgraph node and a system networking interface. When an
.Nm iface
node is created, a new point-to-point interface appears which is accessible via
.Xr ifconfig 8 .
The new interfaces are named
.Dv ng0 ,
.Dv ng1 ,
etc. The node is assigned the same name as its interface, unless the name
already exists, in which case the node remains unnamed.
.Pp
.Nm Iface
nodes have a single hook corresponding to each supported protocol.
Packets transmitted via the interface flow out the corresponding
protocol-specific hook.
Similarly, packets received on a hook appear on the interface as
packets received in the corresponding protocol.
.Pp
The currently supported protocols are IP, IPX, AppleTalk, and NS.
In the KLD module, only support for IP is compiled in by default.
.Pp
.Nm Iface
nodes support the Berkeley Packet Filter (BPF).
In the KLD module, this support is disabled by default.
.Sh HOOKS
This node type supports the following hooks:
.Pp
.Bl -tag -width foobar
.It Dv inet
Transmission and reception of IP packets.
.It Dv ipx
Transmission and reception of IPX packets.
.It Dv atalk
Transmission and reception of AppleTalk packets.
.It Dv ns
Transmission and reception of NS packets.
.El
.Sh CONTROL MESSAGES
This node type supports the generic control messages, plus the following:
.Bl -tag -width foo
.It Dv NGM_IFACE_GET_IFNAME
Returns the name of the interface corresponding to this node in a
.Dv "struct ng_iface_ifname" :
.Bd -literal -offset 4n
struct ng_iface_ifname {
char ngif_name[NG_IFACE_IFACE_NAME_MAX + 1];
};
.Ed
.It Dv NGM_IFACE_GET_IFADDRS
Returns the list of addresses associated with this interface.
The list is returned in the same format as the
.Dv SIOCGIFCONF
ioctl().
.It Dv NGM_CISCO_GET_IPADDR
This message is defined by the
.Xr ng_cisco 8
node type; see
.Xr ng_cisco 8
for a description.
.El
.Sh SHUTDOWN
Because it is currently not possible to remove a system networking
interface in FreeBSD,
.Nm iface
nodes are
.Em persistent.
That is, once created they are never destroyed.
The receipt of a
.Dv NGM_SHUTDOWN
control message disconnects all hooks but does not remove the node.
.Sh SEE ALSO
.Xr netgraph 4 ,
.Xr bpf 4 ,
.Xr ng_cisco 8 ,
.Xr ng_rfc1490 8 ,
.Xr ngctl 8 ,
.Xr ifconfig 8 .
.Sh AUTHOR
Archie Cobbs <archie@whistle.com>
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