Revision 412ed94744d16806fbec3bd250fd94e71cde5a1f authored by Isaku Yamahata on 20 December 2012, 15:12:52 UTC, committed by David S. Miller on 21 December 2012, 21:14:00 UTC
ipgre_tunnel_xmit() parses network header as IP unconditionally.
But transmitting packets are not always IP packet. For example such packet
can be sent by packet socket with sockaddr_ll.sll_protocol set.
So make the function check if skb->protocol is IP.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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