netdev - Re: Fwd: RFC 6980 on Security Implications of IPv6 Fragmentation with IPv6 Neighbor Discovery

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Message-ID: <20130815102507.GA24122@order.stressinduktion.org>
Date:	Thu, 15 Aug 2013 12:25:07 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Loganaden Velvindron <loganaden@...il.com>
Cc:	Fernando Gont <fernando@...t.com.ar>,
	netdev <netdev@...r.kernel.org>
Subject: Re: Fwd: RFC 6980 on Security Implications of IPv6 Fragmentation with IPv6 Neighbor Discovery

On Thu, Aug 15, 2013 at 02:14:46PM +0400, Loganaden Velvindron wrote:
> I'm not sure if you got my previous mails, but I'd like to know a
> couple of things:

Ah, you asked me off-list. So, for a wider audience, I copy & paste my answers
from the just answered mail. ;)

> 1) How can I test this diff ?

Actually, nothing should change at all.

Myself, I used scapy to construct some packets and send it to a system
with the patched kernel and had some printks sprinkeled in the source
while watching tcpdump.

> 2) It's developed against which git brach ? linux-next ?

Yes, I targeted linux-next. But it should apply to older kernels
without too much fuzz as well.

> 3) What will/could break with this diff in a production environment ?

RA messages could get fragmented if a speaker puts lots of options in it. I
hope all RA speakers already spread the options over multiple RAs, but I don't
know. In case the RA is fragmented it will now be dropped silently.

Thanks,

  Hannes

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