netdev - Re: [PATCH v2 -next] netfilter: don't use per-destination incrementing ports in nat random mode

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Date:	Sat, 21 Dec 2013 13:26:17 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	Daniel Borkmann <dborkman@...hat.com>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	kaber@...sh.net
Subject: Re: [PATCH v2 -next] netfilter: don't use per-destination incrementing ports in nat random mode

On Sat, Dec 21, 2013 at 01:17:59PM +0100, Pablo Neira Ayuso wrote:
> > diff --git a/include/uapi/linux/netfilter/nf_nat.h b/include/uapi/linux/netfilter/nf_nat.h
> > index bf0cc37..1ad3659 100644
> > --- a/include/uapi/linux/netfilter/nf_nat.h
> > +++ b/include/uapi/linux/netfilter/nf_nat.h
> 
> This is exposed to userspace.
> 
> > @@ -4,10 +4,14 @@
> >  #include <linux/netfilter.h>
> >  #include <linux/netfilter/nf_conntrack_tuple_common.h>
> >  
> > -#define NF_NAT_RANGE_MAP_IPS		1
> > -#define NF_NAT_RANGE_PROTO_SPECIFIED	2
> > -#define NF_NAT_RANGE_PROTO_RANDOM	4
> > -#define NF_NAT_RANGE_PERSISTENT		8
> > +#define NF_NAT_RANGE_MAP_IPS			(1 << 0)
> > +#define NF_NAT_RANGE_PROTO_SPECIFIED		(1 << 1)
> > +#define NF_NAT_RANGE_PROTO_RANDOM		(1 << 2)
> > +#define NF_NAT_RANGE_PERSISTENT			(1 << 3)
> > +#define NF_NAT_RANGE_PROTO_RANDOM_FULLY		(1 << 4)
> 
> So you cannot change it. It would break old iptables binaries.

There are no semantic changes besides the addition of
NF_NAT_RANGE_PROTO_RANDOM_FULLY. Otherwise just the notation is changed,
which looks sane to me.

> BTW, please send me the userspace part.

Daniel has the patch ready, I think he will submit it later today.

Thanks,

  Hannes

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