linux-kernel - Re: [patch v2.6 4/4] libxt_ipvs: user-space lib for netfilter matcher xt

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Message-ID: <alpine.LSU.2.01.1007211526490.25445@obet.zrqbmnf.qr>
Date:	Wed, 21 Jul 2010 15:28:16 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Simon Horman <horms@...ge.net.au>
cc:	lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, netfilter@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	Malcolm Turnbull <malcolm@...dbalancer.org>,
	Wensong Zhang <wensong@...ux-vs.org>,
	Julius Volz <julius.volz@...il.com>,
	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	Hannes Eder <heder@...gle.com>
Subject: Re: [patch v2.6 4/4] libxt_ipvs: user-space lib for netfilter matcher
 xt_ipvs


On Wednesday 2010-07-21 15:21, Simon Horman wrote:
>> On Wednesday 2010-07-21 03:21, Simon Horman wrote:
>> >> +
>> >> +#define XT_IPVS_IPVS_PROPERTY	(1 << 0) /* all other options imply this one */
>> >> +#define XT_IPVS_PROTO		(1 << 1)
>> >> +#define XT_IPVS_VADDR		(1 << 2)
>> >> +#define XT_IPVS_VPORT		(1 << 3)
>> >> +#define XT_IPVS_DIR		(1 << 4)
>> >> +#define XT_IPVS_METHOD		(1 << 5)
>> >> +#define XT_IPVS_VPORTCTL	(1 << 6)
>> >> +#define XT_IPVS_MASK		((1 << 7) - 1)
>> >> +#define XT_IPVS_ONCE_MASK	(XT_IPVS_MASK & ~XT_IPVS_IPVS_PROPERTY)
>> 
>> Can't these just be an enum?
>
>More than one option can be used at once - they form a mini bitmap -
>so no, I don't think we can use an enum.

An enum does not dictate that you cannot combine values of it with itself.

	enum { A = 1 << 0, B = 1 << 0, };
	unsigned int flags = A | B;

is perfectly fine, which is what other modules do.
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