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Initializing struct flowi4 is useful for drivers that need to emulate routing decisions made by a tunnel interface. Publish the function (appropriately renamed) so that the drivers in question don't need to cut'n'paste it around. Signed-off-by: Petr Machata <petrm@mellanox.com> Reviewed-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>