netdev - Re: Some netfilter compile errors when CONFIG

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Date:	Tue, 14 May 2013 05:10:18 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Cong Wang <amwang@...hat.com>
Cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: Some netfilter compile errors when CONFIG_IPV6=m

On Tue, May 14, 2013 at 10:48:22AM +0800, Cong Wang wrote:
> On Tue, 2013-05-14 at 10:45 +0800, Cong Wang wrote:
> > net/built-in.o: In function `tproxy_tg_init':
> > /home/wangcong/linux/net/netfilter/xt_TPROXY.c:415: undefined reference
> > to `nf_defrag_ipv6_enable'
> > net/built-in.o: In function `socket_mt_init':
> > /home/wangcong/linux/net/netfilter/xt_socket.c:366: undefined reference
> > to `nf_defrag_ipv6_enable'
> 
> I don't know why we keep an empty definition for
> nf_defrag_ipv6_enable(), so I make a patch to remove it, not sure if it
> makes sense.

It's there to enforce the dependency between nf_conntrack and
nf_defrag. We cannot run nf_conntrack without it.
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