netdev - Re: [PATCH 1/3] netfilter: xt_ipvs (netfilter matcher for IPVS)

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Date:	Wed, 2 Sep 2009 18:05:54 +0200
From:	Hannes Eder <heder@...gle.com>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	Patrick McHardy <kaber@...sh.net>, lvs-devel@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	Fabien Duchêne <mad_fab@...net.be>,
	Jean-Luc Fortemaison <jl.fortemaison@...ouvain.be>,
	Julian Anastasov <ja@....bg>,
	Julius Volz <julius.volz@...il.com>,
	Laurent Grawet <laurent.grawet@...ouvain.be>,
	Simon Horman <horms@...ge.net.au>,
	Wensong Zhang <wensong@...ux-vs.org>
Subject: Re: [PATCH 1/3] netfilter: xt_ipvs (netfilter matcher for IPVS)

On Wed, Sep 2, 2009 at 17:49, Jan Engelhardt<jengelh@...ozas.de> wrote:
>
> On Wednesday 2009-09-02 17:36, Patrick McHardy wrote:
>>>
>>> Nice, I'll use par->family.
>>>
>>> So in theory I do not even need a check like the following in the beginning?
>>>
>>>      if (family != NFPROTO_IPV4
>>> #ifdef CONFIG_IP_VS_IPV6
>>>          && family != NFPROTO_IPV6
>>> #endif
>>>              ) {
>>>              match = false;
>>>              goto out;
>>>      }
>>
>>With the AF_UNSPEC registration of your match, it might be used
>
> par->family always contains the NFPROTO of the invoking implementation,
> which can never be UNSPEC (except, in future, xtables2 ;-)
>
> par->match->family however may be UNSPEC if the module works that way.
> Which is why we have par->family.
>

I'll a check_entry function:

static bool ipvs_mt_check(const struct xt_mtchk_param *par)
{
	if (par->family != NFPROTO_IPV4
#ifdef CONFIG_IP_VS_IPV6
	    && par->family != NFPROTO_IPV6
#endif
		)
		return false;

	return true;
}

and remove the runtime check in ipvs_mt.
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