netdev - RE: [RFC PATCH v4 bpf-next 04/12] tcp: Add saw_unknown to struct tcp_options

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Message-ID: <5f28b65d3148a_62272b02d7c945b439@john-XPS-13-9370.notmuch>
Date:   Mon, 03 Aug 2020 18:14:05 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Martin KaFai Lau <kafai@...com>, bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>, kernel-team@...com,
        Lawrence Brakmo <brakmo@...com>,
        Neal Cardwell <ncardwell@...gle.com>, netdev@...r.kernel.org,
        Yuchung Cheng <ycheng@...gle.com>
Subject: RE: [RFC PATCH v4 bpf-next 04/12] tcp: Add saw_unknown to struct
 tcp_options_received

Martin KaFai Lau wrote:
> In a later patch, the bpf prog only wants to be called to handle
> a header option if that particular header option cannot be handled by
> the kernel.  This unknown option could be written by the peer's bpf-prog.
> It could also be a new standard option that the running kernel does not
> support it while a bpf-prog can handle it.
> 
> This patch adds a "saw_unknown" bit to "struct tcp_options_received"
> and it uses an existing one byte hole to do that.  "saw_unknown" will
> be set in tcp_parse_options() if it sees an option that the kernel
> cannot handle.
> 
> Signed-off-by: Martin KaFai Lau <kafai@...com>
> ---

Acked-by: John Fastabend <john.fastabend@...il.com>