netdev - Re: [PATCH RFC 0/4] net: add bpfilter

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Message-ID: <20180219151555.GA23857@breakpoint.cc>
Date:   Mon, 19 Feb 2018 16:15:55 +0100
From:   Florian Westphal <fw@...len.de>
To:     David Miller <davem@...emloft.net>
Cc:     fw@...len.de, daniel@...earbox.net, laforge@...monks.org,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        alexei.starovoitov@...il.com
Subject: Re: [PATCH RFC 0/4] net: add bpfilter

David Miller <davem@...emloft.net> wrote:
> From: Florian Westphal <fw@...len.de>
> Date: Mon, 19 Feb 2018 15:59:35 +0100
> 
> > David Miller <davem@...emloft.net> wrote:
> >> It also means that the scope of developers who can contribute and work
> >> on the translater is much larger.
> > 
> > How so?  Translator is in userspace in nftables case too?
> 
> Florian, first of all, the whole "change the iptables binary" idea is
> a non-starter.  For the many reasons I have described in the various
> postings I have made today.
> 
> It is entirely impractical.

???????
You suggest:

iptables -> setsockopt -> umh (xtables -> ebpf) -> kernel

How is this different from

iptables -> setsockopt -> umh (Xtables -> nftables -> kernel

?
EBPF can be placed within nftables either userspace or kernel,
there is nothing that prevents this.

> Anything designed in that nature must be distributed completely in the
> kernel tree, so that the iptables kernel ABI is provided without any
> externel dependencies.

Would you be willing to merge nftables into kernel tools directory then?