netdev - Re: [PATCH net] ipv6: stop sending PTB packets for MTU

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Date:	Mon, 19 Jan 2015 14:51:42 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	hagen@...u.net
Cc:	netdev@...r.kernel.org, hannes@...essinduktion.org,
	stable@...r.kernel.org, fgont@...networks.com
Subject: Re: [PATCH net] ipv6: stop sending PTB packets for MTU < 1280

From: Hagen Paul Pfeifer <hagen@...u.net>
Date: Thu, 15 Jan 2015 22:34:25 +0100

> Reduce the attack vector and stop generating IPv6 Fragment Header for
> paths with an MTU smaller than the minimum required IPv6 MTU
> size (1280 byte) - called atomic fragments.
> 
> See IETF I-D "Deprecating the Generation of IPv6 Atomic Fragments" [1]
> for more information and how this "feature" can be misused.
> 
> [1] https://tools.ietf.org/html/draft-ietf-6man-deprecate-atomfrag-generation-00
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Fernando Gont <fgont@...networks.com>
> Signed-off-by: Hagen Paul Pfeifer <hagen@...u.net>

Applied, thanks.

But any follow-ups to get rid of RTAX_FEATURE_ALLFRAG altogether are
not to be seriously considered in my opinion.
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