linux-kernel - Re: [PATCH] netfilter: add CHECKSUM target

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Message-ID: <20100711131928.GB3461@redhat.com>
Date:	Sun, 11 Jul 2010 16:19:28 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Jan Engelhardt <jengelh@...ozas.de>,
	Patrick McHardy <kaber@...sh.net>,
	"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 Sun, Jul 11, 2010 at 08:45:01PM +0800, Changli Gao wrote:
> On Sun, Jul 11, 2010 at 8:27 PM, Michael S. Tsirkin <mst@...hat.com> wrote:
> > On Fri, Jul 09, 2010 at 11:56:26AM +0200, Jan Engelhardt wrote:
> >>
> >> On Friday 2010-07-09 00:29, Michael S. Tsirkin wrote:
> >> >
> >> > include/linux/netfilter_ipv4/ipt_CHECKSUM.h |   18 +++++++
> >> > net/ipv4/netfilter/Kconfig                  |   16 ++++++
> >> > net/ipv4/netfilter/Makefile                 |    1 +
> >> > net/ipv4/netfilter/ipt_CHECKSUM.c           |   72 +++++++++++++++++++++++++++
> >>
> >> New modules should use xt.
> >
> > I tried moving the module to xt_CHECKSUM but now
> >        iptables -A POSTROUTING -t mangle -p udp --dport 68 -j CHECKSUM --checksum-fill
> > does not to load the module.
> > It seems that xt_request_find_target in x_tables uses the prefix 'ip' for a module.
> > What am I missing?
> >
> 
> You should add MODULE_ALIAS clause, i.e.
> 
> MODULE_ALIAS("ipt_CHECKSUM");

This worked, thanks!

> -- 
> Regards,
> Changli Gao(xiaosuo@...il.com)
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