netdev - Re: [PATCH nf-next v3 3/3] netfilter: Introduce egress hook

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Message-ID: <CAF90-WjhAS6V_UFYpsnxUDH=sH+1j_2y+Sz2RHU7CWo4iPiC7w@mail.gmail.com>
Date:   Tue, 8 Sep 2020 08:19:31 +0200
From:   Laura García Liébana <nevola@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Lukas Wunner <lukas@...ner.de>,
        John Fastabend <john.fastabend@...il.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Netfilter Development Mailing list 
        <netfilter-devel@...r.kernel.org>, coreteam@...filter.org,
        netdev@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Thomas Graf <tgraf@...g.ch>, David Miller <davem@...emloft.net>
Subject: Re: [PATCH nf-next v3 3/3] netfilter: Introduce egress hook

Hi Daniel,

On Tue, Sep 8, 2020 at 12:11 AM Daniel Borkmann <daniel@...earbox.net> wrote:
>
> On 9/5/20 1:18 PM, Laura García Liébana wrote:
> > On Fri, Sep 4, 2020 at 11:14 PM Daniel Borkmann <daniel@...earbox.net> wrote:
> [...]
> > Something like this seems more trivial to me:
> >
> > table netdev mytable {
> >      chain mychain {
> >          type filter hook egress device "eth0" priority 100; policy drop;
> >          meta protocol != 0x419C accept
> >      }
> > }
>
> Sure, different frontends, so what?! You could also wrap that code into a
> simple a.out or have nft style syntax jit to bpf ...

Not only syntax but get rid of bpf and tc from the application stack
and only maintain 1 interface.

Thanks!