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

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Message-ID: <1442888056.29850.70.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 21 Sep 2015 19:14:16 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pravin Shelar <pshelar@...ira.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] net: Handle negative checksum offset in
 skb-checksum-help

On Mon, 2015-09-21 at 18:04 -0700, Pravin Shelar wrote:
> 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.

Then the bug is here.

Otherwise we might have to 'fix' other places.


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