net: skb_mpls_push() modified to allow MPLS header push at start of packet.
The existing skb_mpls_push() implementation always inserts mpls header after the mac header. L2 VPN use cases requires MPLS header to be inserted before the ethernet header as the ethernet packet gets tunnelled inside MPLS header in those cases. Signed-off-by: Martin Varghese <martin.varghese@nokia.com> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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