ikev2: Handle REDIRECT notifies during IKE_SA_INIT

src/libcharon/sa/ike_sa.h

@@ -847,6 +847,16 @@ struct ike_sa_t {
 	 */
 	void (*send_keepalive) (ike_sa_t *this, bool scheduled);
 
+	/**
+	 * Handle a redirect request.
+	 *
+	 * The behavior is different depending on the state of the IKE_SA.
+	 *
+	 * @param gateway		gateway ID (IP or FQDN) of the target
+	 * @return				FALSE if redirect not possible, TRUE otherwise
+	 */
+	bool (*handle_redirect)(ike_sa_t *this, identification_t *gateway);
+
 	/**
 	 * Get the keying material of this IKE_SA.
 	 *