netdev - Re: [PATCH] net: packet: option to only pass skb protocol

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Message-Id: <20100105.155150.232916389.davem@davemloft.net>
Date:	Tue, 05 Jan 2010 15:51:50 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	cfriesen@...tel.com
Cc:	mst@...hat.com, eric.dumazet@...il.com, nhorman@...driver.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net: packet: option to only pass skb protocol

From: "Chris Friesen" <cfriesen@...tel.com>
Date: Tue, 05 Jan 2010 16:13:29 -0600

> If SOCK_RAW packets are being sent, the protocol number is embedded in
> the packet data

Where exactly is that protocol value?  Not every link level protocol
is ethernet.

We support FDDI, HIPPI, wireless, VLAN, PPP, and a host of others.

So you can't know for sure unless you assume ethernet, which you
can't do.
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