netdev - Re: [PATCH net 3/3] gre: receive also TEB packets for lwtunnels

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Message-ID: <20160424115433.5c0a63ab@griffin>
Date:	Sun, 24 Apr 2016 11:54:33 +0200
From:	Jiri Benc <jbenc@...hat.com>
To:	pravin shelar <pshelar@....org>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Pravin B Shelar <pshelar@...ira.com>,
	Thomas Graf <tgraf@...g.ch>,
	Simon Horman <simon.horman@...ronome.com>
Subject: Re: [PATCH net 3/3] gre: receive also TEB packets for lwtunnels

On Fri, 22 Apr 2016 20:40:13 -0700, pravin shelar wrote:
> But skb->protocol is not set to ETH_P_TEB anywhere in ip-gre module.
> Am I missing something?

Ah, I see your point. It needs to be solved a bit differently, though,
we need to call __iptunnel_pull_header instead of iptunnel_pull_header
for these packets. I'll rework the patch.

> ip_tunnel_rcv() checks device type (tunnel->dev->type) to perform
> ethernet specific processing on packet. I think that should be changed
> to check packet type.

The current behavior is correct. The Ethernet processing depends on
the interface type, ARPHRD_IPGRE interfaces can't treat Ethernet
headers as L2 headers, that wouldn't match the interface type.

 Jiri