netdev - Re: [PATCH 3/5] netfilter: add SYNPROXY core/target

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Date:	Thu, 8 Aug 2013 17:07:10 +0200
From:	Jesper Dangaard Brouer <jbrouer@...hat.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	pablo@...filter.org, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org, mph@....com, as@....com
Subject: Re: [PATCH 3/5] netfilter: add SYNPROXY core/target

On Thu, 8 Aug 2013 08:22:55 +0200
Patrick McHardy <kaber@...sh.net> wrote:

> On Wed, Aug 07, 2013 at 10:56:03PM +0200, Patrick McHardy wrote:
> > On Wed, Aug 07, 2013 at 10:26:00PM +0200, Jesper Dangaard Brouer wrote:
> > > On Wed,  7 Aug 2013 19:42:49 +0200
> > > Patrick McHardy <kaber@...sh.net> wrote:
> > > 
> > > Besides when using net->proc_net_stat, then the first entry is usually
> > > "entries" which is not percpu, this will likely confusing the tool:
> > >   lnstat -f synproxy -c 42
> > 
> > I'll look into that.
> 
> Ok right, the first field must contains something that is not per-CPU.
> Unfortunately I don't have anything to put there and I really don't want
> to keep any global state. The two possibilities I see are:
> 
> - a dummy field
> - the number of proxied connections, but not using a global counter but
>   gathered by iterating over the entire conntrack hash.
> 
> Any opinions?

Well, I would of cause be nice to have some "entries" counter, e.g.
listing the number of active conntrack entries created by the SYNPROXY
target, but I don't think it's possible to identify those conntrack
entries, right.
So, I think it would be okay with just a dummy "entries" field which is
always zero.  

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Sr. Network Kernel Developer at Red Hat
  Author of http://www.iptv-analyzer.org
  LinkedIn: http://www.linkedin.com/in/brouer
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