Subject: Re: [PATCH net-next 1/1] net_sched: Introduce skbmod action

From: Daniel Borkmann <[email-masked]>
Date: Tue, 19 Jul 2016 17:03:40 +0200

On 07/19/2016 03:56 PM, Jamal Hadi Salim wrote:
[...]
>> But apart from this,
>> neither pedit nor tcf_skbmod_run() here handle checksum complete, so you'll
>> potentially get false positives wrt csum corruption and drops as a result
>> when using either of the two.
>
> pedit maybe tricky. Any suggestions?
> On tcf_skbmod_run, mostly ignorance: while doing only ethernet updates;
> is it still needed to do the checksum complete?

Well, what Cong recently fixed with mirred was related to mac header ...

You probably need skb_postpull_rcsum(), skb_postpush_rcsum() pair.

Also, what about skb_try_make_writable()?