netdev - Re: [PATCH net-2.6.26] netlink: make socket filters work on netlink

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Date:	Tue, 01 Apr 2008 10:04:06 -0400
From:	jamal <hadi@...erus.ca>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	David Miller <davem@...emloft.net>, shemminger@...tta.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-2.6.26] netlink: make socket filters work on netlink

On Tue, 2008-01-04 at 13:52 +0200, Patrick McHardy wrote:

> Isn't that what nlmsg_pid already contains?

would work only on the case of user<->user.
On kernel->user it is supposed to be owned by the kernel and set to 0.

OTOH, one could use the nlmsg seq as a "cookie" (since that is untouched
by the kernel) with the hope that no other process will use that same
cookie - then you can filter events based on the cookie. Note this is
only useful if you can guarantee that all processes running on a system
guarantee such uniqueness of such cookies amongst each other; which is
typically a bad assumption for a generic solution but would work.

cheers,
jamal

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