diff --git a/src/dumm/bridge.c b/src/dumm/bridge.c
index c6068e60c..1230dc0d0 100644
--- a/src/dumm/bridge.c
+++ b/src/dumm/bridge.c
@@ -118,7 +118,7 @@ static void unregister(iface_t *iface)
  */
 static void destroy(private_bridge_t *this)
 {
-	this->ifaces->invoke_function(this->ifaces, (void(*)(void*))unregister);
+	this->ifaces->invoke_function(this->ifaces, (linked_list_invoke_t)unregister);
 	this->ifaces->destroy(this->ifaces);
 	if (br_del_bridge(this->name) != 0)
 	{
diff --git a/src/libstrongswan/utils/linked_list.c b/src/libstrongswan/utils/linked_list.c
index cab6d8635..cd755c4c0 100644
--- a/src/libstrongswan/utils/linked_list.c
+++ b/src/libstrongswan/utils/linked_list.c
@@ -671,14 +671,15 @@ static status_t find_last(private_linked_list_t *this, linked_list_match_t match
 /**
  * Implementation of linked_list_t.invoke_offset.
  */
-static void invoke_offset(private_linked_list_t *this, size_t offset)
+static void invoke_offset(private_linked_list_t *this, size_t offset,
+		void *d1, void *d2, void *d3, void *d4, void *d5)
 {
 	element_t *current = this->first;
 	
 	while (current)
 	{
-		void (**method)(void*) = current->value + offset;
-		(*method)(current->value);
+		linked_list_invoke_t *method = current->value + offset;
+		(*method)(current->value, d1, d2, d3, d4, d5);
 		current = current->next;
 	}
 }
@@ -686,13 +687,14 @@ static void invoke_offset(private_linked_list_t *this, size_t offset)
 /**
  * Implementation of linked_list_t.invoke_function.
  */
-static void invoke_function(private_linked_list_t *this, void(*fn)(void*))
+static void invoke_function(private_linked_list_t *this, linked_list_invoke_t fn,
+		void *d1, void *d2, void *d3, void *d4, void *d5)
 {
 	element_t *current = this->first;
 	
 	while (current)
 	{
-		fn(current->value);
+		fn(current->value, d1, d2, d3, d4, d5);
 		current = current->next;
 	}
 }
@@ -843,8 +845,8 @@ linked_list_t *linked_list_create()
 	this->public.remove_last = (status_t (*) (linked_list_t *, void **item))remove_last;
 	this->public.remove = (int(*)(linked_list_t*, void *item, bool (*compare)(void *,void*)))remove;
 	this->public.remove_at = (void(*)(linked_list_t*, enumerator_t *enumerator))remove_at;
-	this->public.invoke_offset = (void (*)(linked_list_t*,size_t))invoke_offset;
-	this->public.invoke_function = (void (*)(linked_list_t*,void(*)(void*)))invoke_function;
+	this->public.invoke_offset = (void (*)(linked_list_t*,size_t,...))invoke_offset;
+	this->public.invoke_function = (void (*)(linked_list_t*,linked_list_invoke_t,...))invoke_function;
 	this->public.clone_offset = (linked_list_t * (*)(linked_list_t*,size_t))clone_offset;
 	this->public.clone_function = (linked_list_t * (*)(linked_list_t*,void*(*)(void*)))clone_function;
 	this->public.destroy = (void (*) (linked_list_t *))destroy;
diff --git a/src/libstrongswan/utils/linked_list.h b/src/libstrongswan/utils/linked_list.h
index 07d759628..214558c01 100644
--- a/src/libstrongswan/utils/linked_list.h
+++ b/src/libstrongswan/utils/linked_list.h
@@ -45,6 +45,14 @@ typedef struct linked_list_t linked_list_t;
  */
 typedef bool (*linked_list_match_t)(void *item, ...);
 
+/**
+ * Method to be invoked on elements in a linked list (used in invoke_* functions)
+ *
+ * @param item			current list item
+ * @param ...			user supplied data (only pointers, at most 5)
+ */
+typedef void (*linked_list_invoke_t)(void *item, ...);
+
 /**
  * Class implementing a double linked list.
  *
@@ -210,15 +218,17 @@ struct linked_list_t {
 	 * macro, e.g.: list->invoke(list, offsetof(object_t, method));
 	 * 
 	 * @param offset	offset of the method to invoke on objects
+	 * @param ...		user data to supply to called function (limited to 5 arguments)
 	 */
-	void (*invoke_offset) (linked_list_t *this, size_t offset);
+	void (*invoke_offset) (linked_list_t *this, size_t offset, ...);
 	
 	/**
 	 * Invoke a function on all of the contained objects.
 	 * 
-	 * @param offset	offset of the method to invoke on objects
+	 * @param function	offset of the method to invoke on objects
+	 * @param ...		user data to supply to called function (limited to 5 arguments)
 	 */
-	void (*invoke_function) (linked_list_t *this, void (*)(void*));
+	void (*invoke_function) (linked_list_t *this, linked_list_invoke_t function, ...);
 	
 	/**
 	 * Clones a list and its objects using the objects' clone method.