linux-kernel - Re: [PATCH 18/29] netfilter: notify about NF

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Message-Id: <1172336149.28579.11.camel@lappy>
Date:	Sat, 24 Feb 2007 17:55:49 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	netdev@...r.kernel.org,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Thomas Graf <tgraf@...g.ch>, David Miller <davem@...emloft.net>
Subject: Re: [PATCH 18/29] netfilter: notify about NF_QUEUE
	vs	emergency	skbs

On Sat, 2007-02-24 at 17:40 +0100, Patrick McHardy wrote:
> Peter Zijlstra wrote:
> > On Sat, 2007-02-24 at 17:17 +0100, Patrick McHardy wrote:
> > 
> > 
> >>I don't really see why
> >>queueing is special though, dropping the packets in the ruleset
> >>will break things just as well, as will routing them to a blackhole.
> >>I guess the user just needs to be smart enough not to do this.
> > 
> > 
> > Its user-space and no emergency packet may rely on user-space because it
> > most likely is needed to maintain user-space.
> 
> I believe I might have misunderstood the intention of this patch.
> 
> Assuming the user is smart enough not to queue packets destined
> to a SOCK_VMIO socket, are you worried about unrelated packets
> allocated from the emergency reserve not getting freed fast
> enough because they're sitting in a queue? In that case simply
> dropping the packets would be fine I guess.

OK, that sounds good. I shall make NF_QUEUE a black hole for emergency
packets.

Alas, that leaves no way to warn a user about a SOCK_VMIO bound packet
treated this way, since, as you said, that is unknown at this point in
the chain.

Thanks,
Peter

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