deprecate RIP

Per https://wiki.freebsd.org/DeprecationPlan, deprecate RIP in 15.0R,
with the intention of removing it in 16.0R.

Add a note to the manpages of routed(8), rdisc(8), rtquery(8),
route6d(8) and rip6query(8) noting that they will be removed
in a future release.

RIP has been obsolete for over 20 years and no one is running it on
modern networks.  If someone really needs RIP, there are alternatives
such as 'bird' or 'quagga' available from ports; there is no need to
ship it in base.

Relnotes:	yes
Reviewed by:	des
Approved by:	des (mentor)
Differential Revision:	https://reviews.freebsd.org/D50292

(cherry picked from commit 4b7cdb5a420f518fbe1968a6916b6d017f54025d)

4 files changed, 27 insertions, 4 deletions

diff --git a/sbin/routed/routed.8 b/sbin/routed/routed.8
index 08d39041cdf9..828960d920ff 100644
--- a/sbin/routed/routed.8
+++ b/sbin/routed/routed.8
@@ -29,13 +29,20 @@
 .\"
 .\"     @(#)routed.8	8.2 (Berkeley) 12/11/93
 .\"
-.Dd June 27, 2022
+.Dd May 20, 2025
 .Dt ROUTED 8
 .Os
 .Sh NAME
 .Nm routed ,
 .Nm rdisc
 .Nd network RIP and router discovery routing daemon
+.Sh DEPRECATION NOTICE
+The
+.Nm routed
+and
+.Nm rdisc
+utilities are deprecated and will be removed in
+.Fx 16.0 .
 .Sh SYNOPSIS
 .Nm
 .Op Fl isqdghmpAtv
diff --git a/sbin/routed/rtquery/rtquery.8 b/sbin/routed/rtquery/rtquery.8
index de5e1fc7cf96..ff46a3414dcf 100644
--- a/sbin/routed/rtquery/rtquery.8
+++ b/sbin/routed/rtquery/rtquery.8
@@ -1,11 +1,16 @@
 .\" $Revision: 2.27 $
 .\"
-.Dd June 1, 1996
+.Dd May 20, 2025
 .Dt RTQUERY 8
 .Os
 .Sh NAME
 .Nm rtquery
 .Nd query routing daemons for their routing tables
+.Sh DEPRECATION NOTICE
+The
+.Nm
+utility is deprecated and will be removed in
+.Fx 16.0 .
 .Sh SYNOPSIS
 .Nm
 .Op Fl np1
diff --git a/usr.sbin/rip6query/rip6query.8 b/usr.sbin/rip6query/rip6query.8
index 856a59138bc1..92e49f5ade58 100644
--- a/usr.sbin/rip6query/rip6query.8
+++ b/usr.sbin/rip6query/rip6query.8
@@ -29,13 +29,19 @@
 .\"
 .\"     $Id: rip6query.8,v 1.2 2000/01/19 06:24:55 itojun Exp $
 .\"
-.Dd October 7, 1999
+.Dd May 20, 2025
 .Dt RIP6QUERY 8
 .Os
 .Sh NAME
 .Nm rip6query
 .Nd RIPng debugging tool
 .\"
+.Sh DEPRECATION NOTICE
+The
+.Nm
+utility is deprecated and will be removed in
+.Fx 16.0 .
+.\"
 .Sh SYNOPSIS
 .Nm
 .Op Fl I Ar interface
diff --git a/usr.sbin/route6d/route6d.8 b/usr.sbin/route6d/route6d.8
index 3a7bc8721923..e9ad3266ba26 100644
--- a/usr.sbin/route6d/route6d.8
+++ b/usr.sbin/route6d/route6d.8
@@ -14,12 +14,17 @@
 .\" LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 .\" A PARTICULAR PURPOSE.
 .\"
-.Dd November 18, 2012
+.Dd May 20, 2025
 .Dt ROUTE6D 8
 .Os
 .Sh NAME
 .Nm route6d
 .Nd RIP6 Routing Daemon
+.Sh DEPRECATION NOTICE
+The
+.Nm
+utility is deprecated and will be removed in
+.Fx 16.0 .
 .Sh SYNOPSIS
 .Nm
 .Op Fl adDhlnqsS