netdev - Re: [PATCH v2] vti4: Fix a ipip packet processing bug in 'IPCOMP' virtual tunnel

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Date:   Thu, 10 Jan 2019 09:11:15 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Su Yanjun <suyj.fnst@...fujitsu.com>
CC:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <kuznet@....inr.ac.ru>, <yoshfuji@...ux-ipv6.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <suyanjun218@...il.com>
Subject: Re: [PATCH v2] vti4: Fix a ipip packet processing bug in 'IPCOMP'
 virtual tunnel

On Sun, Jan 06, 2019 at 09:31:20PM -0500, Su Yanjun wrote:
> Recently we run a network test over ipcomp virtual tunnel.We find that
> if a ipv4 packet needs fragment, then the peer can't receive
> it.
> 
> We deep into the code and find that when packet need fragment the smaller
> fragment will be encapsulated by ipip not ipcomp. So when the ipip packet
> goes into xfrm, it's skb->dev is not properly set. The ipv4 reassembly code
> always set skb'dev to the last fragment's dev. After ipv4 defrag processing,
> when the kernel rp_filter parameter is set, the skb will be drop by -EXDEV
> error.
> 
> This patch adds compatible support for the ipip process in ipcomp virtual tunnel.
> 
> Signed-off-by: Su Yanjun <suyj.fnst@...fujitsu.com>

Patch applied, thanks!