netdev - Re: [PATCH bpf-next v2 3/6] net: remove duplicate reuseport

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Message-ID: <CAN+4W8ijtoew8ouaN3i1NXtg0_G_HHmZyAtf5LsCBb6shCAx2Q@mail.gmail.com>
Date: Wed, 14 Jun 2023 16:25:05 +0100
From: Lorenz Bauer <lmb@...valent.com>
To: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, 
	daniel@...earbox.net, davem@...emloft.net, dsahern@...nel.org, 
	edumazet@...gle.com, haoluo@...gle.com, hemanthmalla@...il.com, 
	joe@...d.net.nz, john.fastabend@...il.com, jolsa@...nel.org, 
	kpsingh@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, martin.lau@...ux.dev, mykolal@...com, 
	netdev@...r.kernel.org, pabeni@...hat.com, sdf@...gle.com, shuah@...nel.org, 
	song@...nel.org, willemdebruijn.kernel@...il.com, yhs@...com
Subject: Re: [PATCH bpf-next v2 3/6] net: remove duplicate reuseport_lookup functions

On Tue, Jun 13, 2023 at 7:57 PM Kuniyuki Iwashima <kuniyu@...zon.com> wrote:
>
>                         else {
>                                 result = sk;
>                         }
>
> The assignment to result below is buggy.  Let's say SO_REUSEPROT group
> have TCP_CLOSE and TCP_ESTABLISHED sockets.

I'm not very familiar with SO_REUSEPORT, I assumed (incorrectly
probably) that such a group would only ever have TCP_CLOSE in UDP case
and TCP_LISTENING in TCP case. Can you explain how I could end up in
this situation?