linux-kernel - Re: [PATCHv4] extensions: libxt

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Message-ID: <4C3F282F.3010006@trash.net>
Date:	Thu, 15 Jul 2010 17:24:31 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	"Daniel P. Berrange" <berrange@...hat.com>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jan Engelhardt <jengelh@...ozas.de>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCHv4] extensions: libxt_CHECKSUM extension

Am 15.07.2010 13:52, schrieb Michael S. Tsirkin:
> This adds a `CHECKSUM' target, which can be used in the iptables mangle
> table.
> 
> You can use this target to compute and fill in the checksum in
> a packet that lacks a checksum.  This is particularly useful,
> if you need to work around old applications such as dhcp clients,
> that do not work well with checksum offloads, but don't want to disable
> checksum offload in your device.
> 
> The problem happens in the field with virtualized applications.
> For reference, see Red Hat bz 605555, as well as
> http://www.spinics.net/lists/kvm/msg37660.html
> 
> Typical expected use (helps old dhclient binary running in a VM):
> iptables -A POSTROUTING -t mangle -p udp --dport bootpc \
> -j CHECKSUM --checksum-fill

Applied to iptables-next, thanks.
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