netdev - Re: [RFD] First draft of RDNSS-in-RA support for IPv6 DNS autoconfiguration

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Message-ID: <467D4D10.20002@simon.arlott.org.uk>
Date:	Sat, 23 Jun 2007 17:40:48 +0100
From:	Simon Arlott <simon@...e.lp0.eu>
To:	"C. Scott Ananian" <cscott@...top.org>
CC:	Rémi Denis-Courmont <rdenis@...phalempin.com>,
	David Stevens <dlstevens@...ibm.com>, netdev@...r.kernel.org
Subject: Re: [RFD] First draft of RDNSS-in-RA support for IPv6 DNS autoconfiguration

On 23/06/07 15:47, C. Scott Ananian wrote:
> Advertisements it received.  I considered storing the *complete*
> Router Advertisement messages received and pushing them unparsed to
> userland, just to get around the bogus "DNS in the kernel" politics
> (hint: it's not a resolver in the kernel, it's just nameserver
> addresses being stored).  Does anyone really suggest that this would
> be a better solution?

Yes, but I don't think it should be completely unparsed - it should be
possible to retrieve the data for a specific attribute type with
expiration information and with notification of changes.

The kernel has to read RAs anyway, why shouldn't it store them in a way
that userspace can access it on demand? A /proc file which is in
resolv.conf format is definitely *wrong*, and while I'd argue for DNS
being special enough to export its attributes is it really too much to
have the kernel provide everything from the last valid message in a
partially parsed format? Applications would then parse the data section
for RA attributes they understand.

-- 
Simon Arlott
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