Fix nonce comparison in rekey collisions, lowest nonce loses

src/libcharon/sa/tasks/child_rekey.c

@@ -241,12 +241,11 @@ static child_sa_t *handle_collision(private_child_rekey_t *this)
 		/* if we have the lower nonce, delete rekeyed SA. If not, delete
 		 * the redundant. */
 		if (memcmp(this_nonce.ptr, other_nonce.ptr,
-				   min(this_nonce.len, other_nonce.len)) < 0)
+				   min(this_nonce.len, other_nonce.len)) > 0)
 		{
 			child_sa_t *child_sa;
 
-			DBG1(DBG_IKE, "CHILD_SA rekey collision won, "
-				 "deleting rekeyed child");
+			DBG1(DBG_IKE, "CHILD_SA rekey collision won, deleting old child");
 			to_delete = this->child_sa;
 			/* don't touch child other created, it has already been deleted */
 			if (!this->other_child_destroyed)
@@ -259,7 +258,7 @@ static child_sa_t *handle_collision(private_child_rekey_t *this)
 		else
 		{
 			DBG1(DBG_IKE, "CHILD_SA rekey collision lost, "
-				 "deleting redundant child");
+				 "deleting rekeyed child");
 			to_delete = this->child_create->get_child(this->child_create);
 		}
 	}

src/libcharon/sa/tasks/ike_rekey.c

@@ -255,19 +255,20 @@ static status_t process_i(private_ike_rekey_t *this, message_t *message)
 			/* if we have the lower nonce, delete rekeyed SA. If not, delete
 			 * the redundant. */
 			if (memcmp(this_nonce.ptr, other_nonce.ptr,
-						min(this_nonce.len, other_nonce.len)) < 0)
+						min(this_nonce.len, other_nonce.len)) > 0)
 			{
 				/* peer should delete this SA. Add a timeout just in case. */
 				job_t *job = (job_t*)delete_ike_sa_job_create(
 						other->new_sa->get_id(other->new_sa), TRUE);
 				lib->scheduler->schedule_job(lib->scheduler, job, 10);
-				DBG1(DBG_IKE, "IKE_SA rekey collision won, deleting rekeyed IKE_SA");
+				DBG1(DBG_IKE, "IKE_SA rekey collision won, waiting for delete");
 				charon->ike_sa_manager->checkin(charon->ike_sa_manager, other->new_sa);
 				other->new_sa = NULL;
 			}
 			else
 			{
-				DBG1(DBG_IKE, "IKE_SA rekey collision lost, deleting redundant IKE_SA");
+				DBG1(DBG_IKE, "IKE_SA rekey collision lost, "
+					 "deleting redundant IKE_SA");
 				/* apply host for a proper delete */
 				host = this->ike_sa->get_my_host(this->ike_sa);
 				this->new_sa->set_my_host(this->new_sa, host->clone(host));