update usetime only if usebytes increase

src/charon/plugins/stroke/stroke_list.c

@@ -175,6 +175,8 @@ static void log_child_sa(FILE *out, child_sa_t *child_sa, bool all)
 		
 		if (all)
 		{
+			bool change;
+
 			fprintf(out, "\n%12s{%d}:  ", child_sa->get_name(child_sa), 
 					child_sa->get_reqid(child_sa));
 			
@@ -207,22 +209,22 @@ static void log_child_sa(FILE *out, child_sa_t *child_sa, bool all)
 				}
 			}
 
-			bytes_in = child_sa->get_usebytes(child_sa, TRUE);
+			bytes_in = child_sa->get_usebytes(child_sa, TRUE, &change);
 			fprintf(out, ", %lu bytes_i", bytes_in);
 			if (bytes_in)
 			{
-				use_in = child_sa->get_usetime(child_sa, TRUE);
+				use_in = child_sa->get_usetime(child_sa, TRUE, change);
 				if (use_in)
 				{
 					fprintf(out, " (%ds ago)", now - use_in);
 				}
 			}
 
-			bytes_out = child_sa->get_usebytes(child_sa, FALSE);
+			bytes_out = child_sa->get_usebytes(child_sa, FALSE, &change);
 			fprintf(out, ", %lu bytes_o", bytes_out);
 			if (bytes_out)
 			{
-				use_out = child_sa->get_usetime(child_sa, FALSE);
+				use_out = child_sa->get_usetime(child_sa, FALSE, change);
 				if (use_out)
 				{
 					fprintf(out, " (%ds ago)", now - use_out);

src/charon/sa/child_sa.c

@@ -136,6 +136,26 @@ struct private_child_sa_t {
 	 * config used to create this child
 	 */
 	child_cfg_t *config;
+
+	/**
+	 * time of last use in seconds (inbound)
+	 */
+	u_int32_t my_usetime;
+
+	/**
+	 * time of last use in seconds (outbound)
+	 */
+	u_int32_t other_usetime;
+
+	/**
+	 * last number of inbound bytes
+	 */
+	u_int64_t my_usebytes;
+
+	/**
+	 * last number of outbound bytes
+	 */
+	u_int64_t other_usebytes;
 };
 
 /**
@@ -357,12 +377,17 @@ static enumerator_t* create_policy_enumerator(private_child_sa_t *this)
 /**
  * Implementation of child_sa_t.get_usetime
  */
-static u_int32_t get_usetime(private_child_sa_t *this, bool inbound)
+static u_int32_t get_usetime(private_child_sa_t *this, bool inbound, bool update)
 {
 	enumerator_t *enumerator;
 	traffic_selector_t *my_ts, *other_ts;
 	u_int32_t last_use = 0;
 
+	if (!update)
+	{
+		return (inbound) ? this->my_usetime : this->other_usetime;
+	}
+
 	enumerator = create_policy_enumerator(this);
 	while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
 	{
@@ -394,17 +419,26 @@ static u_int32_t get_usetime(private_child_sa_t *this, bool inbound)
 		}
 	}
 	enumerator->destroy(enumerator);
+	if (inbound)
+	{
+		this->my_usetime = last_use;
+	}
+	else
+	{
+		this->other_usetime = last_use;
+	}
 	return last_use;
 }
 
 /**
  * Implementation of child_sa_t.get_usebytes
  */
-static u_int64_t get_usebytes(private_child_sa_t *this, bool inbound)
+static u_int64_t get_usebytes(private_child_sa_t *this, bool inbound, bool *change)
 {
-	status_t status = NOT_SUPPORTED;
+	status_t status;
 	u_int64_t bytes;
 
+	*change = FALSE;
 	if (inbound) 
 	{
 		if (this->my_spi)
@@ -412,7 +446,14 @@ static u_int64_t get_usebytes(private_child_sa_t *this, bool inbound)
 			status = charon->kernel_interface->query_sa(charon->kernel_interface,
 									this->other_addr, this->my_addr,
 									this->my_spi, this->protocol, &bytes);
+			if (status == SUCCESS && bytes > this->my_usebytes)
+			{
+				*change = TRUE;
+				this->my_usebytes = bytes;
+				return bytes;
+			}
 		}
+		return this->my_usebytes;
 	}
 	else
 	{
@@ -421,9 +462,15 @@ static u_int64_t get_usebytes(private_child_sa_t *this, bool inbound)
 			status = charon->kernel_interface->query_sa(charon->kernel_interface,
 									this->my_addr, this->other_addr,
 						 			this->other_spi, this->protocol, &bytes);
+			if (status == SUCCESS && bytes > this->other_usebytes)
+			{
+				*change = TRUE;
+				this->other_usebytes = bytes;
+				return bytes;
+			}
 		}
+		return this->other_usebytes;
 	}
-	return (status == SUCCESS) ? bytes : 0;
 }
 
 /**
@@ -805,7 +852,7 @@ child_sa_t * child_sa_create(host_t *me, host_t* other,
 	this->public.set_proposal = (void(*)(child_sa_t*, proposal_t *proposal))set_proposal;
 	this->public.get_lifetime = (u_int32_t(*)(child_sa_t*, bool))get_lifetime;
 	this->public.get_usetime = (u_int32_t(*)(child_sa_t*, bool))get_usetime;
-	this->public.get_usebytes = (u_int64_t(*)(child_sa_t*, bool))get_usebytes;
+	this->public.get_usebytes = (u_int64_t(*)(child_sa_t*, bool, bool*))get_usebytes;
 	this->public.has_encap = (bool(*)(child_sa_t*))has_encap;
 	this->public.get_ipcomp = (ipcomp_transform_t(*)(child_sa_t*))get_ipcomp;
 	this->public.set_ipcomp = (void(*)(child_sa_t*,ipcomp_transform_t))set_ipcomp;
@@ -828,6 +875,10 @@ child_sa_t * child_sa_create(host_t *me, host_t* other,
 	this->encap = encap;
 	this->ipcomp = IPCOMP_NONE;
 	this->state = CHILD_CREATED;
+	this->my_usetime = 0;
+	this->other_usetime = 0;
+	this->my_usebytes = 0;
+	this->other_usebytes = 0;
 	/* reuse old reqid if we are rekeying an existing CHILD_SA */
 	this->reqid = rekey ? rekey : ++reqid;
 	this->my_ts = linked_list_create();

src/charon/sa/child_sa.h

@@ -240,17 +240,19 @@ struct child_sa_t {
 	 * Get last use time of the CHILD_SA.
 	 *
 	 * @param inbound	TRUE for inbound traffic, FALSE for outbound
+	 * @param update	update time of last use via kernel query	
 	 * @return			time of last use in seconds
 	 */
-	u_int32_t (*get_usetime)(child_sa_t *this, bool inbound);
+	u_int32_t (*get_usetime)(child_sa_t *this, bool inbound, bool update);
 	
 	/**
 	 * Get number of bytes processed by CHILD_SA.
 	 *
-	 * @param inbound	TRUE for inbound traffic, FALSE for outbound
+	 * @param inbound		TRUE for inbound traffic, FALSE for outbound
-	 * @return			number of processed bytes
+	 * @param[out] change	TRUE if change since last query, FALSE else
+	 * @return				number of processed bytes
 	 */
-	u_int64_t (*get_usebytes)(child_sa_t *this, bool inbound);
+	u_int64_t (*get_usebytes)(child_sa_t *this, bool inbound, bool *change);
 
 	/**
 	 * Get the traffic selectors list added for one side.

src/charon/sa/ike_sa.c

@@ -273,7 +273,11 @@ static time_t get_use_time(private_ike_sa_t* this, bool inbound)
 	enumerator = this->child_sas->create_enumerator(this->child_sas);
 	while (enumerator->enumerate(enumerator, &child_sa))
 	{
-		use_time = max(use_time, child_sa->get_usetime(child_sa, inbound));
+		u_int64_t use_bytes;
+		bool change;
+
+		use_bytes = child_sa->get_usebytes(child_sa, inbound, &change);
+		use_time = max(use_time, child_sa->get_usetime(child_sa, inbound, change));
 	}
 	enumerator->destroy(enumerator);