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

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Message-ID: <b1ae75ac-82b5-aa24-c59a-3988d94d6a10@iogearbox.net>
Date:   Tue, 8 Sep 2020 00:11:22 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Laura García Liébana <nevola@...il.com>
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

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 ...