netdev - Re: Passive OS fingerprint xtables match (iptables part)

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Message-ID: <20090215173502.GB19556@ioremap.net>
Date:	Sun, 15 Feb 2009 20:35:03 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>
Subject: Re: Passive OS fingerprint xtables match (iptables part)

On Fri, Feb 13, 2009 at 02:54:25PM +0100, Jan Engelhardt (jengelh@...ozas.de) wrote:
> >'! --genre Linux' means this option was not specified,
> >'--genre ! Linux' means everything but Linux.
> 
> Well not in iptables. Not specifying an option is represented by 
> voidness/absence of any string. (E.g. iptables -d 192.168.0.0/16  vs.
> iptables ! -s 172.16.0.0/12 -d 192.168.0.0/16)
> Also, (!(--genre == "linux")) is eqv. (--genre != "linux")
> is equivalent in boolean logic  ;-)

And that's not what should be :)
In the code it is intended to be:
(--genre && (--genre != Linux))

But I really do not care where to put a '!' sign in the documentation
string :)

-- 
	Evgeniy Polyakov
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