Re: [PATCH 2.6.15.4 1/1][RFC] ipt_owner: inode match supporting both incoming and outgoing packets

[Patrick McHardy <kaber@trash.net>]

Török 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.