further work for rekeying:

get liftimes from policy
  added new state
  initiation of rekeying done
proposal redone:
  removed support for AH+ESP proposals

src/charon/config/policies/policy.h

@@ -229,6 +229,25 @@ struct policy_t {
 	 */
 	void (*add_proposal) (policy_t *this, proposal_t *proposal);
 	
+	/**
+	 * @brief Get the lifetime of a policy, before rekeying starts.
+	 * 
+	 * A call to this function automatically adds a jitter to
+	 * avoid simultanous rekeying.
+	 * 
+	 * @param this				policy 
+	 * @return					lifetime in seconds
+	 */
+	u_int32_t (*get_soft_lifetime) (policy_t *this);
+	
+	/**
+	 * @brief Get the lifetime of a policy, before SA gets deleted.
+	 * 
+	 * @param this				policy
+	 * @return					lifetime in seconds
+	 */
+	u_int32_t (*get_hard_lifetime) (policy_t *this);
+	
 	/**
 	 * @brief Clone a policy.
 	 *