netdev - Re: [PATCH net v3] ip_tunnel: Set network header properly for IP_ECN

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Date:	Mon, 05 May 2014 09:32:51 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ying Cai <ycai@...gle.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Neal Cardwell <ncardwell@...gle.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: Re: [PATCH net v3] ip_tunnel: Set network header properly for
 IP_ECN_decapsulate()

On Sun, 2014-05-04 at 15:20 -0700, Ying Cai wrote:
> In ip_tunnel_rcv(), set skb->network_header to inner IP header
> before IP_ECN_decapsulate().
> 
> Without the fix, IP_ECN_decapsulate() takes outer IP header as
> inner IP header, possibly causing error messages or packet drops.
> 
> Note that this skb_reset_network_header() call was in this spot when
> the original feature for checking consistency of ECN bits through
> tunnels was added in eccc1bb8d4b4 ("tunnel: drop packet if ECN present
> with not-ECT"). It was only removed from this spot in 3d7b46cd20e3
> ("ip_tunnel: push generic protocol handling to ip_tunnel module.").


Acked-by: Eric Dumazet <edumazet@...gle.com>


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