netdev - Re: [PATCH 1/4] netfilter: xt_connlimit: fix daddr connlimit in SNAT scenario

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Message-ID: <alpine.LNX.2.01.1103150302310.27019@obet.zrqbmnf.qr>
Date:	Tue, 15 Mar 2011 03:05:21 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Changli Gao <xiaosuo@...il.com>
cc:	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/4] netfilter: xt_connlimit: fix daddr connlimit in SNAT
 scenario

On Tuesday 2011-03-15 02:30, Changli Gao wrote:

>On Tue, Mar 15, 2011 at 9:16 AM, Jan Engelhardt <jengelh@...ozas.de> wrote:
>>
>>
>> The original tuple may not be updated, but the reply tuple is.
>> And we are taking the reply tuple in
>>
>>        tuple_ptr = &ct->tuplehash[IP_CT_DIR_REPLY].tuple;
>>
>> which is subsequently copied to conn->tuple on the first invocation.
>>
>> Afterwards, SNAT will update ct->tuplehash[reply].tuple, and so
>> conn->tuple is outdated. Calling nf_conntrack_find_get(conn->tuple)
>> in count_them would then fail, would it not?
>>
>
>After my patch, tuple is only used to look up the corresponding
>conntrack.

Ok, the patch may be applied. Somehow I was under the impression
addr was extracted from tuple_ptr, but it is, in fact, not.
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