Re: [RFC xt-compat] ebtables: full nft translations

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Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> wrote:
> Cc'ing Arturo, he added the ebtables-compat layer so he probably
> remember more details on this.
> 
> On Sat, Mar 31, 2018 at 07:17:41PM +0200, Florian Westphal wrote:
> > This (haycky) patch translates 'ebtables --mark' to a native 'meta mark'
> > and dissects meta mark back to the ebt_mark_m binary representation when
> > parsing back nftables rules.
> > 
> > Plan is to do this for all the ebt matches/watchers/targets so that
> > 1. 'nft list ruleset' shows correct/expected output
> > 2. we can (eventually) remove ebtables support from kernel
> > 3. make iptables install 'ebtables' by default as drop-in replacement.
> > 
> > ebtables is much more feature limited than iptables,
> > nft should already provide all/complete feature set.
> > 
> > Downside: Because we can't (should not) add nftables specific code
> > to libebt_XXX.c, this 'leaks' ebt_mark_m_info struct definition to
> > nft-bridge.c.  I think its okay, we could also eventually remove all
> > the libebt_XXX files and provide everything from nft-bridge.c as builtin
> > functionality.
> > 
> > Does that appear sane to you?
> 
> So far the compat infrastructure uses nft_compat.c, which uses xtables
> matches/targets from the kernel.
> 
> I mean, probably get this working through nft_compat instead?

It already works via nft_compat.

Only issue is that nft list ruleset won't display this correctly
because ebt lacks xlate() functions.

However, I thought ebtables might be a low-hanging fruit to
ditch nft_compat and make it work with nftables directly.

> So probably nft-bridge and ebtables-compat is missing match/target
> support and we get in sync with what we do in iptables-compat?
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