netdev - Re: Regarding UDP-Lite deprecation and removal

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Date: Mon, 18 Mar 2024 15:10:25 +0100
From: Florian Westphal <fw@...len.de>
To: Lynne <dev@...ne.ee>
Cc: Netdev <netdev@...r.kernel.org>, Kuniyu <kuniyu@...zon.com>,
	Willemdebruijn Kernel <willemdebruijn.kernel@...il.com>
Subject: Re: Regarding UDP-Lite deprecation and removal

Lynne <dev@...ne.ee> wrote:
> UDP-Lite was scheduled to be removed in 2025 in commit
> be28c14ac8bbe1ff due to a lack of real-world users, and
> a long-outstanding security bug being left undiscovered.
> 
> I would like to open a discussion to perhaps either avoid this,
> or delay it, conditionally.

Is there any evidence UDP-Lite works in practice?

I am not aware of any HW that will peek into L3/L4 payload to figure out
that the 'udplite' payload should be passed up even though it has bad csum.

So, AFAIU L2 FCS/CRC essentially renders entire 'partial csum' premise moot,
stack will never receive udplite frames that are damaged.

Did things change?