netdev - Re: [PATCH] net-ipv6-ndisc: add support for 'PREF64' dns64 prefix identifier

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Message-Id: <20200326.200621.1074393855940705004.davem@davemloft.net>
Date:   Thu, 26 Mar 2020 20:06:21 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     zenczykowski@...il.com
Cc:     maze@...gle.com, netdev@...r.kernel.org, ek@...gle.com,
        furry@...gle.com, lorenzo@...gle.com, mharo@...gle.com
Subject: Re: [PATCH] net-ipv6-ndisc: add support for 'PREF64' dns64 prefix
 identifier

From: Maciej Żenczykowski <zenczykowski@...il.com>
Date: Mon, 23 Mar 2020 18:10:19 -0700

> From: Maciej Żenczykowski <maze@...gle.com>
> 
> This is trivial since we already have support for the entirely
> identical (from the kernel's point of view) RDNSS, DNSSL, etc. that
> also contain opaque data that needs to be passed down to userspace
> for further processing.
> 
> As specified in draft-ietf-6man-ra-pref64-09 (while it is still a draft,
> it is purely waiting on the RFC Editor for cleanups and publishing):
>   PREF64 option contains lifetime and a (up to) 96-bit IPv6 prefix.
> 
> The 8-bit identifier of the option type as assigned by the IANA is 38.
> 
> Since we lack DNS64/NAT64/CLAT support in kernel at the moment,
> thus this option should also be passed on to userland.
> 
> See:
>   https://tools.ietf.org/html/draft-ietf-6man-ra-pref64-09
>   https://www.iana.org/assignments/icmpv6-parameters/icmpv6-parameters.xhtml#icmpv6-parameters-5
> 
> Cc: Erik Kline <ek@...gle.com>
> Cc: Jen Linkova <furry@...gle.com>
> Cc: Lorenzo Colitti <lorenzo@...gle.com>
> Cc: Michael Haro <mharo@...gle.com>
> Signed-off-by: Maciej Żenczykowski <maze@...gle.com>

Applied to net-next.