netdev - Re: [net-next v2 3/3] cfg80211: add MPLS and 802.21 classification

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Date:	Mon, 17 Feb 2014 14:06:53 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	mathias.kretschmer@...us.fraunhofer.de
Cc:	arend@...adcom.com, sw@...onwunderlich.de, netdev@...r.kernel.org,
	linux-wireless@...r.kernel.org
Subject: Re: [net-next v2 3/3] cfg80211: add MPLS and 802.21 classification

From: "Kretschmer, Mathias" <mathias.kretschmer@...us.fraunhofer.de>
Date: Mon, 17 Feb 2014 17:34:34 +0000

> Thought so, as well. But it seems that skb->protocol is not properly
> set when the packet originates from a packet socket.  And in our
> case we cannot set it to a fixed etherType in the bind() call since
> we use three different etherTypes on the same socket.

So many things break if the skb->protocol isn't set correctly that I
would consider such SKBs mal-formed.

You can specify the protocol number in the msghdr passed into the
send.
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