netdev - Re: [PATCH net] sit: Set skb->protocol properly in ipip6_tunnel

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Message-Id: <20161128.150652.616103157114396212.davem@davemloft.net>
Date:   Mon, 28 Nov 2016 15:06:52 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     alexander.duyck@...il.com, sfr@...b.auug.org.au, elicooper@....com,
        netdev@...r.kernel.org
Subject: Re: [PATCH net] sit: Set skb->protocol properly in
 ipip6_tunnel_xmit()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 28 Nov 2016 10:17:23 -0800

> It appears that Eli changelog was not very precise, because his bug was
> because of XFRM being involved.
> 
> xfrm_output() -> xfrm_output_gso() -> skb_gso_segment()
> 
> So XFRM calls skb_gso_segment() before ip_output() or
> ip6_finish_output2() had a chance to change skb->protocol

I think if we do it in ip6_local_out and ip_local_out, then none of
these hacks will be necessary at all.