netdev - Re: [PATCH net-next 0/4] net: IP defrag: use rbtrees in IPv6 defragmentation

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Date:   Thu, 24 Jan 2019 08:41:19 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Peter Oskolkov <posk@...gle.com>,
        David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     Peter Oskolkov <posk.devel@...il.com>
Subject: Re: [PATCH net-next 0/4] net: IP defrag: use rbtrees in IPv6
 defragmentation



On 01/22/2019 10:02 AM, Peter Oskolkov wrote:
> Currently, IPv6 defragmentation code drops non-last fragments that
> are smaller than 1280 bytes: see
> commit 0ed4229b08c1 ("ipv6: defrag: drop non-last frags smaller than min mtu")
> 
> This behavior is not specified in IPv6 RFCs and appears to break compatibility
> with some IPv6 implementations, as reported here:
> https://www.spinics.net/lists/netdev/msg543846.html
> 
> This patchset contains four patches:
> - patch 1 moves rbtree-related code from IPv4 to files shared b/w
> IPv4/IPv6
> - patch 2 changes IPv6 defragmenation code to use rbtrees for defrag
> queue
> - patch 3 changes nf_conntrack IPv6 defragmentation code to use rbtrees
> - patch 4 changes ip_defrag selftest to test changes made in the
> previous three patches.
> 
> Along the way, the 1280-byte restrictions are removed.

Thanks a lot for following up on this Peter.

Reviewed-by: Eric Dumazet <edumazet@...gle.com>