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Document SIOCDELLABEL, link among MPLS drivers

Use of the IOCTL section losely adopted from bridge(4),
the list of ioctls however is still incomplete.

mpw(4) and mpip(4) could use a reference to mpe(4) IOCTL or so,
but this is good enough for starters.

Feedback OK claudio

.\"	$OpenBSD: mpip.4,v 1.3 2021/03/18 14:22:04 kn Exp $
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.\" Copyright (C) 2019 David Gwynne <dlg@openbsd.org>
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.Dd $Mdocdate: March 18 2021 $
.Dt MPIP 4
.Os
.Sh NAME
.Nm mpip
.Nd MPLS IP layer 2 pseudowire
.Sh SYNOPSIS
.Cd "pseudo-device mpip"
.Sh DESCRIPTION
The
.Nm
interface is used to create an MPLS IP layer 2 tunnel between two points.
.Pp
An
.Nm
interface can be created at runtime using the
.Sy ifconfig Nm Ns Ar N Cm create
command, or by setting up a
.Xr hostname.if 5
configuration file for
.Xr netstart 8 .
The interface itself can be configured with
.Xr ifconfig 8 .
.Pp
The local MPLS label, the remote MPLS label and neighbor, use of
pseudowire control words, or flow-aware transport are normally
configured after negotiation with a remote system using
.Xr ldpd 8 ,
but it is also possible to configure them manually using
.Xr ifconfig 8 .
.Sh EXAMPLES
Create a pseudowire with local label 20 and remote label 21 on
neighbor 10.254.0.1:
.Bd -literal -offset indent
# ifconfig mpip5 create
# ifconfig mpip5 mplslabel 20 pweneighbor 21 10.254.0.1
# ifconfig mpip5 up
.Ed
.Pp
Disable the use of the Pseudowire Emulation Edge-to-Edge (PWE3)
Control Word, and enable the use of a Flow label for Flow-Aware
Transport of Pseudowires:
.Bd -literal -offset indent
# ifconfig mpip5 -pwecw pwefat
.Ed
.Sh SEE ALSO
.Xr mpe 4 ,
.Xr mpw 4 ,
.Xr hostname.if 5 ,
.Xr ifconfig 8 ,
.Xr ldpd 8 ,
.Xr netstart 8
.Sh STANDARDS
.Rs
.%A S. Bryant
.%A P. Pate
.%D March 2005
.%R RFC 3985
.%T Pseudo Wire Emulation Edge-to-Edge (PWE3) Architecture
.Re
.Pp
.Rs
.%A S. Bryant
.%A G. Swallow
.%A L. Martini
.%D February 2005
.%R RFC 4385
.%T Pseudowire Emulation Edge-to-Edge (PWE3) Control Word \
for Use over an MPLS PSN
.Re
.Pp
.Rs
.%A S. Bryant
.%A C. Filsfils
.%A U. Drafz
.%A V. Kompella
.%A J. Regan
.%A S. Amante
.%D November 2011
.%R RFC 6391
.%T Flow-Aware Transport of Pseudowires over an MPLS Packet Switched Network
.Re
.Sh HISTORY
The
.Nm
kernel interface first appeared in
.Ox 6.5 .