netdev - Re: [PATCH nf-next v4 5/5] af_packet: Introduce egress hook

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Message-ID: <CA+FuTSfuLfh3H45HnvtJPocxj+E7maGwzkgYsfktna2+cJi9zQ@mail.gmail.com>
Date:   Fri, 22 Jan 2021 11:13:19 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        netfilter-devel <netfilter-devel@...r.kernel.org>,
        coreteam@...filter.org,
        Network Development <netdev@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Thomas Graf <tgraf@...g.ch>,
        Laura Garcia Liebana <nevola@...il.com>,
        John Fastabend <john.fastabend@...il.com>
Subject: Re: [PATCH nf-next v4 5/5] af_packet: Introduce egress hook

On Fri, Jan 22, 2021 at 4:44 AM Lukas Wunner <lukas@...ner.de> wrote:
>
> From: Pablo Neira Ayuso <pablo@...filter.org>
>
> Add egress hook for AF_PACKET sockets that have the PACKET_QDISC_BYPASS
> socket option set to on, which allows packets to escape without being
> filtered in the egress path.
>
> This patch only updates the AF_PACKET path, it does not update
> dev_direct_xmit() so the XDP infrastructure has a chance to bypass
> Netfilter.
>
> Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
> [lukas: acquire rcu_read_lock, fix typos, rebase]
> Signed-off-by: Lukas Wunner <lukas@...ner.de>

Isn't the point of PACKET_QDISC_BYPASS to skip steps like this?