From: Jonathan Matthew <jonathan@d14n.org>
Subject: Re: rad(8): track vltime / pltime for "auto prefix"es
To: Bjorn Ketelaars <bket@openbsd.org>
Cc: Florian Obser <florian@openbsd.org>, tech@openbsd.org
Date: Sun, 26 May 2024 10:37:48 +1000

On Thu, May 23, 2024 at 06:32:49AM +0200, Bjorn Ketelaars wrote:
> On Mon 20/05/2024 14:16, Florian Obser wrote:
> > Prefixes delegated via DHCPv6 have a lifetime, honour it.
> > 
> > The "auto prefix" feature derives the prefix to announce from a
> > configured IPv6 address. If that address has a vltime / pltime use
> > that value in router advertisements instead of statically configured
> > values.
> > 
> > We also need to count down the vltime / pltime as time progresses.
> > 
> > This is on top of "rad(8): reduce calls to getifaddrs(3)" and also needs
> > "send RTM_CHGADDRATTR for vltime / pltime changes" to work correctly.
> > 
> > OK?
> 
> Tested this on top of "rad(8) reduce calls to getifaddrs(3)" and "send
> RTM_CHGADDRATTR for vltime / pltime changes".  No issues observed in a
> dual-stack setup, and no complaining clients.
> 
> "send RTM_CHGADDRATTR for vltime / pltime changes" is already in. FWIW,
> ok bket@ for the 2 rad(8) diffs.

I've been running these diffs with a dhcpcd delegated prefix for a few
days and everything is working nicely.  ok jmatthew@ also.