kernel: Use a time_t to report use time in query_sa()

src/libhydra/kernel/kernel_interface.c

@@ -208,7 +208,7 @@ METHOD(kernel_interface_t, update_sa, status_t,
 METHOD(kernel_interface_t, query_sa, status_t,
 	private_kernel_interface_t *this, host_t *src, host_t *dst,
 	u_int32_t spi, u_int8_t protocol, mark_t mark,
-	u_int64_t *bytes, u_int64_t *packets, u_int32_t *time)
+	u_int64_t *bytes, u_int64_t *packets, time_t *time)
 {
 	if (!this->ipsec)
 	{

src/libhydra/kernel/kernel_interface.h

@@ -200,12 +200,12 @@ struct kernel_interface_t {
 	 * @param mark			optional mark for this SA
 	 * @param[out] bytes	the number of bytes processed by SA
 	 * @param[out] packets	number of packets processed by SA
-	 * @param[out] time		last time of SA use
+	 * @param[out] time		last (monotonic) time of SA use
 	 * @return				SUCCESS if operation completed
 	 */
 	status_t (*query_sa) (kernel_interface_t *this, host_t *src, host_t *dst,
 						  u_int32_t spi, u_int8_t protocol, mark_t mark,
-						  u_int64_t *bytes, u_int64_t *packets, u_int32_t *time);
+						  u_int64_t *bytes, u_int64_t *packets, time_t *time);
 
 	/**
 	 * Delete a previously installed SA from the SAD.

src/libhydra/kernel/kernel_ipsec.h

@@ -156,12 +156,12 @@ struct kernel_ipsec_t {
 	 * @param mark			optional mark for this SA
 	 * @param[out] bytes	the number of bytes processed by SA
 	 * @param[out] packets	number of packets processed by SA
-	 * @param[out] time		last time of SA use
+	 * @param[out] time		last (monotonic) time of SA use
 	 * @return				SUCCESS if operation completed
 	 */
 	status_t (*query_sa) (kernel_ipsec_t *this, host_t *src, host_t *dst,
 						  u_int32_t spi, u_int8_t protocol, mark_t mark,
-						  u_int64_t *bytes, u_int64_t *packets, u_int32_t *time);
+						  u_int64_t *bytes, u_int64_t *packets, time_t *time);
 
 	/**
 	 * Delete a previusly installed SA from the SAD.