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UDP tunnel sockets are always opened unbound to a specific device. This patch allow the socket to be bound on a custom device, which incidentally makes UDP tunnels VRF-aware if binding to an l3mdev. Signed-off-by: Alexis Bauvin <abauvin@scaleway.com> Reviewed-by: Amine Kherbouche <akherbouche@scaleway.com> Tested-by: Amine Kherbouche <akherbouche@scaleway.com> Signed-off-by: David S. Miller <davem@davemloft.net>