netdev - Re: TAHI testing fails for IPv6 Fragments in Kernel 4.9

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Message-Id: <20190306.142818.1045935324715292108.davem@davemloft.net>
Date:   Wed, 06 Mar 2019 14:28:18 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     captwiggum@...il.com
Cc:     netdev@...r.kernel.org
Subject: Re: TAHI testing fails for IPv6 Fragments in Kernel 4.9

From: Captain Wiggum <captwiggum@...il.com>
Date: Wed, 6 Mar 2019 15:26:43 -0700

> We are using the TAHI Self-test tools from IPv6 Ready Logo Program:
> https://www.ipv6ready.org/?page=documents&tag=ipv6-core-protocols
> 
> The test passed up to 4.9.133, then fails ever since.
> 
> The are about 20 failing test cases regarding IPv6 fragments,
> where the kernel is issuing an ICMPv6 parameter problem pointing
> to the Fragmentation Header.
> 
> I see lots of commits regarding improving fragment processing.
> Has anyone else run TAHI tests on kernel 4.9 or later?
> Is there any interest in looking into this to improve
> the IPv6 functionality?

It is intentionally failing those tests to fix a denial of service
issue with ipv6 fragmentation and this will therefore not be changed.