Message-ID: <43F77571.7020100@trash.net>
Date: Sat, 18 Feb 2006 20:28:49 +0100
From: Patrick McHardy <kaber@trash.net>
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To: =?ISO-8859-1?Q?T=F6r=F6k_Edwin?= <edwin@gurde.com>
CC: netfilter-devel@lists.netfilter.org, fireflier-devel@lists.sourceforge.net,
       linux-kernel@vger.kernel.org, martinmaurer@gmx.at
Subject: Re: [PATCH 2.6.15.4 1/1][RFC] ipt_owner: inode match supporting both
 incoming and outgoing packets
References: <200602181420.02791.edwin@gurde.com>
In-Reply-To: <200602181420.02791.edwin@gurde.com>
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T?r?k Edwin wrote:
> First of all this is what I'd like to achieve:
> - filter packets by the program who sent the packet
> - filter packets by the program who is going to receive the packet
> - when multiple programs share a socket (i.e. they listen on the same socket), 
> allow the packet only if all programs are allowed to receive the packet

Besides the tasklist_lock issues, there is no 1:1 relationship between
sockets and processes, which is why this can never work. You don't know
which process is going to receive a packet until it calls recvmsg().

There is some work in progress to solve this problem in a different way,
by adding new hooks to the protocols that get the socket as context,
and using SElinux labels instead of process names/inodes/whatever for
matching.
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