netdev - Re: Linux IPv6 DAD not full conform to RFC 4862 ?

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Message-Id: <20080109.155544.136768603.davem@davemloft.net>
Date:	Wed, 09 Jan 2008 15:55:44 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	yoshfuji@...ux-ipv6.org
Cc:	kkeil@...e.de, netdev@...r.kernel.org
Subject: Re: Linux IPv6 DAD not full conform to RFC 4862 ?

From: YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@...ux-ipv6.org>
Date: Thu, 10 Jan 2008 08:46:55 +0900 (JST)

> In article <20080109.153212.144388472.davem@...emloft.net> (at Wed, 09 Jan 2008 15:32:12 -0800 (PST)), David Miller <davem@...emloft.net> says:
> 
> > I question any RFC mandate that shuts down IP communication on a node
> > because of packets received from remote systems.
> 
> RFC4862 tell us that we SHOULD disable IP communication.
> (IP means IPv6 here; IPv4 is out of scope.)
> In IETF term, a SHOULD is almost a MUST.  We are required to follow
> unless we have very good reason to ignore it.

A DoS by definition is a very good reason.

> > If the TAHI test can trigger this, so can a compromised system on your
> > network and won't that be fun? :-)
> 
> So, I know the specification, but I have ignored it.
> I think it is fine to implent in some way, but I do think we must have
> a switch not to do this.

Because of the above, the existing behavior must still stay the
default.  I hope this is your plan.

By default Linux will not implement this SHOULD, it's a security
issue.

I more and more do not like these conformance tests, they leave no
room whatsoever for handling bugs or ill-specified features in the
specification.
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