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Implement RFC 8781 PREF64 router advertisement option.

With this clients can learn the presence and used prefix for Network
Address and Protocol Translation between IPv6 and IPv4 (NAT64).

Apparently there is support in mobile devices as well as in macOS.

This option, together with the the dhcp "IPv6-only preferred"
option (108) enables the Customer-side transLATor (CLAT) on macOS so
IPv4 literals can be used in IPv6-only networks.

Input & OK kn

.\"	$OpenBSD: rad.8,v 1.7 2022/10/15 13:26:15 florian Exp $
.\"
.\" Copyright (c) 2018 Florian Obser <florian@openbsd.org>
.\" Copyright (c) 2016 Kenneth R Westerback <kwesterback@gmail.com>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: October 15 2022 $
.Dt RAD 8
.Os
.Sh NAME
.Nm rad
.Nd router advertisement daemon
.Sh SYNOPSIS
.Nm
.Op Fl dnv
.Op Fl f Ar file
.Op Fl s Ar socket
.Sh DESCRIPTION
.Nm
is an IPv6 router advertisement daemon.
It periodically sends IPv6 router advertisement messages with prefix
and default router information.
Clients like
.Xr slaacd 8
use these to configure IPv6 addresses on network interfaces and set default
routes.
Additionally it listens for IPv6 router solicitation messages and responds
with router advertisements.
.Pp
To have
.Nm
enabled at boot time, use
.Dq rcctl enable rad ,
which sets
.Pp
.Dl rad_flags=\(dq\(dq
.Pp
in
.Xr rc.conf.local 8 .
.Pp
A running
.Nm
can be controlled with the
.Xr ractl 8
utility.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl d
Do not daemonize.
If this option is specified,
.Nm
will run in the foreground and log to
.Em stderr .
.It Fl f Ar file
Specify an alternative configuration file.
.It Fl n
Configtest mode.
Only check the configuration file for validity.
.It Fl s Ar socket
Use an alternate location for the default control socket.
.It Fl v
Produce more verbose output.
.El
.Sh FILES
.Bl -tag -width "/var/run/rad.sockXX" -compact
.It Pa /etc/rad.conf
Default
.Nm
configuration file.
.It Pa /var/run/rad.sock
.Ux Ns -domain
socket used for communication with
.Xr ractl 8 .
.El
.Sh SEE ALSO
.Xr rad.conf 5 ,
.Xr ractl 8 ,
.Xr slaacd 8
.Sh STANDARDS
.Rs
.%A R. Draves
.%A D. Thaler
.%D November 2005
.%R RFC 4191
.%T Default Router Preferences and More-Specific Routes
.Re
.Pp
.Rs
.%A R. Hinden
.%A S. Deering
.%D February 2006
.%R RFC 4291
.%T IP Version 6 Addressing Architecture
.Re
.Pp
.Rs
.%A T. Narten
.%A E. Nordmark
.%A W. Simpson
.%A H. Soliman
.%D September 2007
.%R RFC 4861
.%T Neighbor Discovery for IP version 6 (IPv6)
.Re
.Pp
.Rs
.%A A. Yourtchenko
.%A L. Colitti
.%D February 2016
.%R RFC 7772
.%T Reducing Energy Consumption of Router Advertisements
.Re
.Pp
.Rs
.%A J. Jeong
.%A S. Park
.%A L. Beloeil
.%A S. Madanapalli
.%D March 2017
.%R RFC 8106
.%T IPv6 Router Advertisement Options for DNS Configuration
.Re
.Pp
.Rs
.%A L. Colitti
.%A J. Linkova
.%D April 2020
.%R RFC 8781
.%T Discovering PREF64 in Router Advertisements
.Re
.Sh HISTORY
The
.Nm
program first appeared in
.Ox 6.4 .
.Sh AUTHORS
.An -nosplit
The
.Nm
program was written by
.An Florian Obser Aq Mt florian@openbsd.org .