netdev - Re: [PATCH] iptables: document IPv6 TOS mangling bug in old Linux kernels

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Message-ID: <4DFACE41.5010906@trash.net>
Date:	Fri, 17 Jun 2011 05:47:13 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Fernando Luis V�zquez Cao 
	<fernando@....ntt.co.jp>
CC:	Jan Engelhardt <jengelh@...ozas.de>,
	Maciej <zenczykowski@...il.com>,
	Pablo Neira Aysuo <pablo@...filter.org>,
	Netfilter Developer Mailing List 
	<netfilter-devel@...r.kernel.org>,
	Linux Networking Developer Mailing List 
	<netdev@...r.kernel.org>
Subject: Re: [PATCH] iptables: document IPv6 TOS mangling bug in old Linux
 kernels

On 17.06.2011 03:14, Fernando Luis V�zquez Cao wrote:
> In Linux kernels up to and including 2.6.38, with the exception of longterm
> releases 2.6.32.42 (or later) and 2.6.33.15 (or later), there is a bug (*) whereby
> IPv6 TOS mangling does not behave as documented and differs from the IPv4
> version. The TOS mask indicates the bits one wants to zero out, so it needs to
> be inverted before applying it to the original TOS field. However, the
> aformentioned kernels forgo the inversion which breaks --set-tos and its
> mnemonics.
> 
> (*) Fixed by upstream commit:
>     1ed2f73d90fb49bcf5704aee7e9084adb882bfc5 (netfilter: IPv6: fix DSCP mangle code)
> 

Applied, thanks.
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