netdev - Re: [PATCH] core/dev: set pkt_type after eth_type_trans() in dev_forward

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Date:	Tue, 02 Jul 2013 16:00:05 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	yamahata@...inux.co.jp
Cc:	netdev@...r.kernel.org, murphy.mccauley@...il.com,
	jasowang@...hat.com, mst@...hat.com, edumazet@...gle.com,
	kaber@...sh.net, honkiko@...il.com, ramirose@...il.com,
	tparkin@...alix.com, xiyou.wangcong@...il.com, pshelar@...ira.com,
	jesse@...ira.com, dev@...nvswitch.org
Subject: Re: [PATCH] core/dev: set pkt_type after eth_type_trans() in
 dev_forward_skb()

From: Isaku Yamahata <yamahata@...inux.co.jp>
Date: Tue,  2 Jul 2013 20:30:10 +0900

> The dev_forward_skb() assignment of pkt_type should be done
> after the call to eth_type_trans().
> 
> ip-encapsulated packets can be handled by localhost. But skb->pkt_type
> can be PACKET_OTHERHOST when packet comes via veth into ip tunnel device.
> In that case, the packet is dropped by ip_rcv().
> Although this example uses gretap. l2tp-eth also has same issue.
> For l2tp-eth case, add dummy device for ip address and ip l2tp command.
 ...
> Signed-off-by: Isaku Yamahata <yamahata@...inux.co.jp>

Applied, but I had to adjust the patch because in net-next we use
a new helper function (skb_scrub_packet()) to clear things out from
dev_forward_skb().
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