From mboxrd@z Thu Jan  1 00:00:00 1970
From: Patrick McHardy <kaber@trash.net>
Subject: Re: [PATCH] iptables: add -C to check for existing rules
Date: Tue, 08 Mar 2011 15:57:45 +0100
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References: <20110308115639.GA30013@zirkel.wertarbyte.de>
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Cc: netfilter-devel@vger.kernel.org
To: Stefan Tomanek <stefan.tomanek@wertarbyte.de>
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Am 08.03.2011 12:56, schrieb Stefan Tomanek:
> It is often useful to check whether a specific rule is already present
> in a chain without actually modifying the iptables config.
> 
> Services like fail2ban usually employ techniques like grepping through
> the output of "iptables -L" which is quite error prone.
> 
> This patch adds a new operation -C to the iptables command which mostly
> works like -D; it can detect and indicate the existence of the specified
> rule by modifying the exit code. The new operation TC_CHECK_ENTRY uses
> the same code as the -D operation, whose functions got a dry-run
> parameter appended.

Looks fine to me. I'll apply this if nobody else objects.