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Date:   Mon, 3 Aug 2020 17:21:24 -0700
From:   Eric Dumazet <>
To:     Martin KaFai Lau <>
Cc:     bpf <>, Alexei Starovoitov <>,
        Daniel Borkmann <>,
        kernel-team <>,
        Lawrence Brakmo <>,
        Neal Cardwell <>,
        netdev <>,
        Yuchung Cheng <>
Subject: Re: [RFC PATCH v4 bpf-next 04/12] tcp: Add saw_unknown to struct tcp_options_received

On Mon, Aug 3, 2020 at 4:10 PM 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 <>
> ---

Reviewed-by: Eric Dumazet <>

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