FreeBSD/Linux Kernel Cross Reference
sys/modules/netgraph/iface/ng_iface.4

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    .\" Author: Archie Cobbs <archie@freebsd.org>
    .\"
    .\" $FreeBSD$
    .\" $Whistle: ng_iface.8,v 1.5 1999/01/25 23:46:26 archie Exp $
    .\"
    .Dd January 19, 1999
    .Dt NG_IFACE 4
    .Os FreeBSD
    .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
    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
    An
    .Nm
    node has 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
    An
    .Nm
    node supports the Berkeley Packet Filter (BPF). 
    .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
   .Fn ioctl .
   .It Dv NGM_CISCO_GET_IPADDR
   This message is defined by the
   .Xr ng_cisco 4
   node type; see
   .Xr ng_cisco 4
   for a description.
   .El
   .Sh SHUTDOWN
   Because it is currently not possible to remove a system networking
   interface in
   .Fx ,
   .Nm
   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 bpf 4 ,
   .Xr netgraph 4 ,
   .Xr ng_cisco 4 ,
   .Xr ifconfig 8 ,
   .Xr ngctl 8
   .Sh HISTORY
   The
   .Nm
   node type was implemented in
   .Fx 4.0 .
   .Sh AUTHORS
   .An Archie Cobbs Aq archie@freebsd.org

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