netdev - Re: [PATCH net] net: Handle negative checksum offset in skb-checksum-help

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Message-ID: <CALnjE+owCFib4oXD5zbJNRR9ZosT508tS=0_YL3UD1xg51hD3g@mail.gmail.com>
Date:	Mon, 21 Sep 2015 18:04:14 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] net: Handle negative checksum offset in skb-checksum-help

On Mon, Sep 21, 2015 at 5:14 PM, David Miller <davem@...emloft.net> wrote:
> From: Pravin B Shelar <pshelar@...ira.com>
> Date: Sun, 20 Sep 2015 23:53:17 -0700
>
>> VXLAN device can receive skb with checksum partial. But the checksum
>> offset could be in outer header which is pulled on receive.
>
> Such a scenerio is a bug.
>
> Anything that pulls off a header should use a utility function such
> as skb_pull_rcsum() or skb_postpull_rcsum() to make sure this gets
> fixed up properly.

skb_postpull_rcsum() does not change checksum-offset. vxlan receive
already calls this function.
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