bridge: Pull ip header into skb->data before looking into ip header.
If lower layer driver leaves the ip header in the skb fragment, it needs to be first pulled into skb->data before inspecting ip header length or ip version number. Signed-off-by: NSarveshwar Bandi <sarveshwar.bandi@emulex.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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