[Bug 1410] STATELESS, rules with notrack into a map

[bugzilla-daemon at netfilter.org]

https://bugzilla.netfilter.org/show_bug.cgi?id=1410

--- Comment #6 from Pablo Neira Ayuso <pablo at netfilter.org> ---
(In reply to Pablo Neira Ayuso from comment #5)
> (In reply to Pablo Neira Ayuso from comment #3)
> [...]
> > > snat to ip saddr map { 2.2.2.2 : 1.1.1.1, 2.2.2.3 : 1.1.1.2 }
> > > 
> > > This reads as follows: if packets came _from_ IP address 2.2.2.2, the
> > > rewrite source address to 1.1.1.1 and so on.
> > 
> > nft add rule raw PREROUTING ip saddr set ip saddr map { 1.1.1.1 : 2.2.2.2,
> > 1.1.1.2 : 2.2.2.3 } notrack
> 
> Assuming the legacy table/chains, you can use posrtouting/mangle for the
> stateless dnat 

You will still still to disable conntrack from PREROUTING for stateless dnat,
so this would be:

nft add rule raw PREROUTING ip saddr { 1.1.1.1, 1.1.1.2} notrack

The rule above disables conntrack for traffic coming from 1.1.1.1 and 1.1.1.2,
then:

nft add rule mangle POSTROUTING ip saddr set ip saddr map { 1.1.1.1 : 2.2.2.2,
1.1.1.2 : 2.2.2.3 }

This rule performs the stateless snat.

I can place these examples in the wiki if you like.

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