Re: [PATCH 1/1] netfilter: Add possibility to turn off netfilters defrag per netns

[Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>]

On Wed, 4 Jan 2012, Pablo Neira Ayuso wrote:

> On Wed, Jan 04, 2012 at 12:48:35PM +0100, Hans Schillstrom wrote:
> > I like that idea, an "early" table at prio -500 with PREROUTING.
> > There is also a need for a new flag "--allfrags"
> > i.e. all fragments needs to be sorted out and sent to same dest for defrag.
> > 
> > ex.
> > iptables -t early -A PREROUTING -i eth0 --allfrags -j NOTRACK
> 
> New tables add too much overhead. We have discussed this before with
> Patrick.
> 
> Since this still remains specific to your needs, I think you can
> remove nf_conntrack module in your setup.
> 
> I don't come with one sane setup that may want selectively defragment
> some traffic yes and other not.
> 
> Am I missing anything else?

I agree. If you don't want defragmentation at all, then make sure you 
don't load the nf_conntrack module directly/indirectly. Conntrack doesn't 
work without defragmentation anyway.

The only thing what such a really-early table could buy at the moment is 
to specify which flows not to defragment at layer 3 level.

If we had dynamic hooks registration and hook priorities at table level, 
that'd come handy now.

Best regards,
Jozsef
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