Added payloads for IKEv1 NAT-Traversal negotiation.

src/libcharon/encoding/payloads/payload.h

@@ -117,6 +117,16 @@ enum payload_type_t {
 	 */
 	CONFIGURATION_V1 = 14,
 
+	/**
+	 * NAT discovery payload (NAT-D).
+	 */
+	NAT_D_V1 = 20,
+
+	/**
+	 * NAT original address payload (NAT-OA)
+	 */
+	NAT_OA_V1 = 21,
+
 	/**
 	 * The security association (SA) payload containing proposals.
 	 */