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

- From: Pravin Shelar \<hidden\>
- Date: 2015-09-22 01:04:15 
- List: netdev
- Page: https://ratatoskr.run/netdev/2015/09/10997309
- Thread: https://ratatoskr.run/netdev/2015/09/10997134/t.md

```text
On Mon, Sep 21, 2015 at 5:14 PM, David Miller [ref] wrote:
> From: Pravin B Shelar <redacted>
> 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.
```