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Date:   Mon, 03 Aug 2020 15:30:24 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] net: gre: recompute gre csum for sctp over gre

From: Lorenzo Bianconi <>
Date: Fri, 31 Jul 2020 20:12:05 +0200

> The GRE tunnel can be used to transport traffic that does not rely on a
> Internet checksum (e.g. SCTP). The issue can be triggered creating a GRE
> or GRETAP tunnel and transmitting SCTP traffic ontop of it where CRC
> offload has been disabled. In order to fix the issue we need to
> recompute the GRE csum in gre_gso_segment() not relying on the inner
> checksum.
> The issue is still present when we have the CRC offload enabled.
> In this case we need to disable the CRC offload if we require GRE
> checksum since otherwise skb_checksum() will report a wrong value.
> Fixes: 4749c09c37030 ("gre: Call gso_make_checksum")
> Signed-off-by: Lorenzo Bianconi <>

Applied with Fixes: tag corrected and queued up for -stable.


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