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.\" Author: Archie Cobbs <archie@whistle.com>
.\"
.\" $FreeBSD$
.\"
.Dd November 15, 1999
.Dt NG_KSOCKET 8
.Os FreeBSD
.Sh NAME
.Nm ng_ksocket
.Nd kernel socket netgraph node type
.Sh SYNOPSIS
.Fd #include <netgraph/ng_ksocket.h>
.Sh DESCRIPTION
A
.Nm ksocket
node is both a netgraph node and a BSD socket.  The
.Nm ksocket
node type allows one to open a socket inside the kernel and have
it appear as a Netgraph node.  The
.Nm ksocket
node type is the reverse of the socket node type (see
.Xr ng_socket 8 "):"
whereas the socket node type enables the user-level manipulation (via
a socket) of a kernel-level entity (the associated Netgraph node), the
.Nm ksocket
node type enables the kernel-level manipulation (via a Netgraph node) of
a user-level entity (the associated socket).
.Pp
A
.Nm ksocket
node allows at most one hook connection.  Connecting to the node is
equivalent to opening the associated socket.  The name given to the hook
determines what kind of socket the node will act like (see below).
When the hook is disconnected and/or the node is shutdown, the
associated socket is closed.
.Sh HOOKS
This node type supports a single hook connection at a time.
The name of the hook must be of the form
.Dv Em <family>/<type>/<proto> ,
where the
.Dv Em family ,
.Dv Em type ,
and
.Dv Em proto
are the decimal equivalent of the same arguments to
.Xr socket 2 .
Alternately, aliases for the commonly used values are accepted as
well.  For example
.Dv inet/dgram/udp
is a more readable but equivalent version of 
.Dv 2/2/17 .
.Sh CONTROL MESSAGES
This node type supports the generic control messages, plus the following:
.Bl -tag -width foo
.It Dv NGM_KSOCKET_BIND
This functions exactly like the
.Xr bind 2
system call.  The
.Dv "struct sockaddr"
socket address parameter should be supplied as an argument.
.It Dv NGM_KSOCKET_LISTEN
This functions exactly like the
.Xr listen 2
system call.  The backlog paramter (a single
.Dv int )
should be supplied as an argument.
.It Dv NGM_KSOCKET_CONNECT
This functions exactly like the
.Xr connect 2
system call.  The
.Dv "struct sockaddr"
socket address parameter should be supplied as an argument.
.It Dv NGM_KSOCKET_ACCEPT
Currently unimplemented.
.It Dv NGM_KSOCKET_GETNAME
Currently unimplemented.
.It Dv NGM_KSOCKET_GETPEERNAME
Currently unimplemented.
.It Dv NGM_KSOCKET_SETOPT
Currently unimplemented.
.It Dv NGM_KSOCKET_GETOPT
Currently unimplemented.
.El
.Pp
.Sh SHUTDOWN
This node shuts down upon receipt of a
.Dv NGM_SHUTDOWN
control message, or when the hook is disconnected.
Shutdown of the node closes the associated socket.
.Sh SEE ALSO
.Xr socket 2 ,
.Xr netgraph 4 ,
.Xr ng_socket 8 ,
.Xr ngctl 8 .
.Sh AUTHOR
Archie Cobbs <archie@whistle.com>