linux-kernel - Re: [PATCH net] ipv6: distinguish frag queues by device for multicast and link-local packets

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Date:	Tue, 24 Nov 2015 16:46:25 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	mkubecek@...e.cz
Cc:	yoshfuji@...ux-ipv6.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	linux-kernel@...r.kernel.org, kuznet@....inr.ac.ru,
	jmorris@...ei.org, kaber@...sh.net, pablo@...filter.org,
	kadlec@...ckhole.kfki.hu
Subject: Re: [PATCH net] ipv6: distinguish frag queues by device for
 multicast and link-local packets

From: Michal Kubecek <mkubecek@...e.cz>
Date: Tue, 24 Nov 2015 15:07:11 +0100 (CET)

> If a fragmented multicast packet is received on an ethernet device which
> has an active macvlan on top of it, each fragment is duplicated and
> received both on the underlying device and the macvlan. If some
> fragments for macvlan are processed before the whole packet for the
> underlying device is reassembled, the "overlapping fragments" test in
> ip6_frag_queue() discards the whole fragment queue.
> 
> To resolve this, add device ifindex to the search key and require it to
> match reassembling multicast packets and packets to link-local
> addresses.
> 
> Note: similar patch has been already submitted by Yoshifuji Hideaki in
> 
>   http://patchwork.ozlabs.org/patch/220979/
> 
> but got lost and forgotten for some reason.
> 
> Signed-off-by: Michal Kubecek <mkubecek@...e.cz>

This is definitely the right thing to do and matches how ipv4 keys
fragments.

Applied and queued up for -stable, thanks!
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