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

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Date:   Wed, 6 Mar 2019 14:34:25 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Miller <davem@...emloft.net>, captwiggum@...il.com
Cc:     netdev@...r.kernel.org
Subject: Re: TAHI testing fails for IPv6 Fragments in Kernel 4.9



On 03/06/2019 02:28 PM, David Miller wrote:
> 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.


That was Florian patch that was later reverted, right ?

0ed4229b08c13c84a3c301a08defdc9e7f4467e6 ipv6: defrag: drop non-last frags smaller than min mtu

-> reverted in 

d4289fcc9b16b89619ee1c54f829e05e56de8b9a net: IP6 defrag: use rbtrees for IPv6 defrag