geneve: Make dst-port configurable.

Add netlink interface to configure Geneve UDP port number.
So that user can configure it for a Gevene device.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Reviewed-by: Jesse Gross <jesse@nicira.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Acked-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 2d13dd4..9d73c31 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -410,6 +410,7 @@
 	IFLA_GENEVE_REMOTE,
 	IFLA_GENEVE_TTL,
 	IFLA_GENEVE_TOS,
+	IFLA_GENEVE_PORT,	/* destination port */
 	__IFLA_GENEVE_MAX
 };
 #define IFLA_GENEVE_MAX	(__IFLA_GENEVE_MAX - 1)