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

[Jan Engelhardt <jengelh@xxxxxxxxxx>]

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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