netdev - Re: [PATCH] netfilter: add CHECKSUM target

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Date:	Fri, 9 Jul 2010 18:26:34 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Patrick McHardy <kaber@...sh.net>
cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	netfilter@...r.kernel.org, coreteam@...filter.org,
	netdev@...r.kernel.org, herbert.xu@...hat.com, kvm@...r.kernel.org
Subject: Re: [PATCH] netfilter: add CHECKSUM target


On Friday 2010-07-09 17:17, Patrick McHardy wrote:
>
>> 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
>> an IP 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.
>
>I'm not sure this is something we want to merge upstream and
>support indefinitely.

We could put it into Xtables-addons. That would also be consistent
with Dave's suggestion.

>Dave suggested this as a temporary
>out-of-tree workaround until the majority of guest dhcp clients
>are fixed. Has anything changed that makes this course of
>action impractical?
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