encoding: Add getter for IKE SPIs in IKEv1 DELETE payloads

src/libcharon/encoding/payloads/delete_payload.h

@@ -1,4 +1,5 @@
 /*
+ * Copyright (C) 2015 Tobias Brunner
  * Copyright (C) 2005-2006 Martin Willi
  * Copyright (C) 2005 Jan Hutter
  * Hochschule fuer Technik Rapperswil
@@ -60,6 +61,15 @@ struct delete_payload_t {
 	 */
 	void (*set_ike_spi)(delete_payload_t *this, u_int64_t spi_i, u_int64_t spi_r);
 
+	/**
+	 * Get the IKE SPIs from an IKEv1 delete.
+	 *
+	 * @param spi_i			initiator SPI
+	 * @param spi_r			responder SPI
+	 * @return				TRUE if SPIs extracted successfully
+	 */
+	bool (*get_ike_spi)(delete_payload_t *this, u_int64_t *spi_i, u_int64_t *spi_r);
+
 	/**
 	 * Get an enumerator over the SPIs in network order.
 	 *