netdev - Re: [PATCH net-2.6.25] Add packet filtering based on process'ssecurity context.

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Message-Id: <200711302359.GGF60963.LtFFFHQVJOSOOM@I-love.SAKURA.ne.jp>
Date:	Fri, 30 Nov 2007 23:59:13 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	sam@...ack.fr
Cc:	jmorris@...ei.org, herbert@...dor.apana.org.au,
	netdev@...r.kernel.org, davem@...emloft.net,
	linux-security-module@...r.kernel.org, kaber@...sh.net,
	netfilter-devel@...r.kernel.org, sds@...ho.nsa.gov
Subject: Re: [PATCH net-2.6.25] Add packet filtering based on process'ssecurity context.

Hello.

Samir Bellabes wrote:
> at security_socket_accept(), the user only accept the fact that the
> application is able to go to sock->ops->accept(). That's the purpose of
> this hook.
Yes. This hook can't perform filtering.

> After, when packet are coming, we can catch them with
> libnetfilter_queue, and deal with filtering packets.
Is this performed inside sock->ops->accept()?

> here we agree. *but* in my module, the user don't judge before
> sock->ops->accept(). He judges when packets are coming, throught the
> libnetfilter_queue API, in userspace, and reinject packet if it's ok.
I didn't understand what is happening.
Is there a hook which can perform filtering inside sock->ops->accept()?

Regards.

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