linux-kernel - Re: [PATCH] net/tcp: Only produce AO/MD5 logs if there are any keys

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Message-ID: <20240104085855.4c5c5a1f@kernel.org>
Date: Thu, 4 Jan 2024 08:58:55 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Dmitry Safonov <dima@...sta.com>
Cc: Eric Dumazet <edumazet@...gle.com>, "David S. Miller"
 <davem@...emloft.net>, Paolo Abeni <pabeni@...hat.com>, Christian Kujau
 <lists@...dbynature.de>, Salam Noureddine <noureddine@...sta.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Dmitry Safonov
 <0x7f454c46@...il.com>
Subject: Re: [PATCH] net/tcp: Only produce AO/MD5 logs if there are any keys

On Thu, 4 Jan 2024 16:42:05 +0000 Dmitry Safonov wrote:
> >> Keep silent and avoid logging when there aren't any keys in the system.
> >>
> >> Side-note: I also defined static_branch_tcp_*() helpers to avoid more
> >> ifdeffery, going to remove more ifdeffery further with their help.  
> > 
> > Wouldn't we be better off converting the prints to trace points. 
> > The chances for hitting them due to malicious packets feels much
> > higher than dealing with a buggy implementation in the wild.  
> 
> Do you mean a proper stuff like in net/core/net-traces.c or just
> lowering the loglevel to net_dbg_ratelimited() [like Christian
> originally proposed], which in turns becomes runtime enabled/disabled?

I mean proper tracepoints.

> Both seem fine to me, albeit I was a bit reluctant to change it without
> a good reason as even pre- 2717b5adea9e TCP-MD5 messages were logged and
> some userspace may expect them. I guess we can try and see if anyone
> notices/complains over changes to these messages changes or not.

Hm. Perhaps we can do the conversion in net-next. Let me ping Eric :)