netdev - SO_ATTACH_REUSEPORT_EBPF and TCP_DEFER

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Message-ID: <CAJO99Tn411oPCLG0pSc6CKBiaBb0n_LAz=7uc+xF-jOPGfwcFg@mail.gmail.com>
Date: Fri, 22 Sep 2023 12:02:49 +0200
From: Bjørnar Ness <bjornar.ness@...il.com>
To: netdev <netdev@...r.kernel.org>
Subject: SO_ATTACH_REUSEPORT_EBPF and TCP_DEFER_ACCEPT

Hi

I was hoping and trying to peek into TLS client hello packet from
reuseport ebpf when setting
TCP_DEFER_ACCEPT, but unfortunately this is not the case.

Is there any technical reason for needing to "route" the SYN packet to
a listening socket
(except for fastopen), or could this decision potentially be deferred
by introducing a EAGAIN
return from ebpf?

-- 
Bj(/)rnar