linux-kernel - Re: netfilter spurious ELOOP

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Date:	Wed, 25 Mar 2009 18:07:36 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	David Miller <davem@...emloft.net>
CC:	Francis.Dupont@...pont.fr, linux-kernel@...r.kernel.org,
	coreteam@...filter.org, Francis_Dupont@....org,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: netfilter spurious ELOOP

David Miller wrote:
> From: Francis Dupont <Francis.Dupont@...pont.fr>
> Date: Wed, 25 Mar 2009 00:02:05 +0100
> 
> Adding correct CC:'s
> 
>> summary: iptables command gets spurious ELOOP errors
>>
>> report: when a rule with a target like MARK --set-mark 0x80000001
>> then adding new other rules can failed with "Too many levels of symbolic
>> links" (aka ELOOP) error.
>> The problem is in kernel net/ipv4/netfilter/ip_tables.c in the 
>> mark_source_chains() routine which checks the verdict field of
>> targets even for not standard targets.
>>
>> keywords: netfilter target eloop
>>
>> environment: recent gentoo and fedora. Problem not fixed in
>> linux-2.6.29 (last stable version taken from kernel.org some minutes ago).

Just to clarify: does the problem happens when you have the MARK rule
above in a user-defined chain that has more then one jump leading to
it or does it also happen in other cases?
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