Re: [nft PATCH v2 0/4] xt: Implement dump and restore support

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On Fri, Nov 18, 2022 at 11:11:42AM +0100, Pablo Neira Ayuso wrote:
> Merging threads.
> 
> On Fri, Nov 18, 2022 at 10:55:04AM +0100, Phil Sutter wrote:
> [...]
> > > I think this more or less a summary of what we discussed in the NFWS.
> >
> > Pablo, I think you're mixing up two things here:
> >
> > This "support dump and load of compat expression" feature is to sanitize
> > the current situation with up to date iptables and nftables.
> 
> OK, then the problem we discuss is mixing iptables-nft and nftables.
> 
> On Fri, Nov 18, 2022 at 10:47:48AM +0100, Phil Sutter wrote:
> [...]
> > > At this time I'd rather like a time machine to prevent nft_compat.c from
> > > getting merged :-(
> >
> > If you do, please convince Pablo to not push iptables commit 384958620a.
> > I think it opened the can of worms we're trying to confine here.
> 
> It could be worst, if iptables-nft would not be in place, then old
> iptables-legacy and new nftables rules would have no visibility each
> other.
> 
> With iptables-nft we have a way to move forward:
> 
> - Replace nft_compat by native expressions from iptables-nft.
> - Extend iptables-nft to understand more complex expressions, worst
>   case dump a native representation.
> 
> Why don't we just move ahead this path instead of spinning around the
> compat layer? This only requires userspace updates on iptables-nft.

Sure! I'm just picking low hanging fruits first. With even translation
support being still incomplete, I fear it will take a while until the
tools are fluent enough for this to not matter anymore. And then there's
still nftables without libxtables support.

Cheers, Phil



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