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[Xen-devel] Re: [netfilter-core] Re: [PATCH] Avoid unncessary checksum v

To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: [Xen-devel] Re: [netfilter-core] Re: [PATCH] Avoid unncessary checksum validation in TCP/UDP netfilter
From: Patrick McHardy <kaber@xxxxxxxxx>
Date: Sun, 12 Jun 2005 17:06:03 +0200
Cc: Phil Oester <kernel@xxxxxxxxxxxx>, cedric@xxxxxxxxxxxxxxxxxx, coreteam@xxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
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Keir Fraser wrote:
> On 27 May 2005, at 12:20, Phil Oester wrote:
>> On Fri, May 27, 2005 at 12:03:08PM +0100, Keir Fraser wrote:
>>> The TCP/UDP connection-tracking code in netfilter validates the
>>> checksum of incoming packets, to prevent nastier errors further down
>>> the road. This check is unnecessary if the skb is marked as
>> It seems at least part of this has already been merged in 2.6.12-rc
> It would be great if the UDP code also would observe
> CHECKSUM_UNNECESSARY. I'll wait for 2.6.12 to appear and then submit a
> new patch if UDP has been missed.

TCP was changed to fix a regression with loopback packets. I've added
the UDP part of your patch to my 2.6.13 tree.


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