-int dhcp_client_config (vlib_main_t * vm,
- u32 sw_if_index,
- u8 * hostname,
- u8 * client_id,
- u32 is_add,
- u32 client_index,
- void *event_callback, u8 set_broadcast_flag, u32 pid);
+/**
+ * Add/Delete DHCP clients
+ */
+extern int dhcp_client_config (u32 is_add,
+ u32 client_index,
+ vlib_main_t * vm,
+ u32 sw_if_index,
+ u8 * hostname,
+ u8 * client_id,
+ dhcp_event_cb_t event_callback,
+ u8 set_broadcast_flag, u32 pid);
+
+/**
+ * callback function for clients walking the DHCP client configurations
+ *
+ * @param client The client being visitsed
+ * @param data The data passed during the call to 'walk'
+ * @return !0 to continue walking 0 to stop.
+ */
+typedef int (*dhcp_client_walk_cb_t) (const dhcp_client_t * client,
+ void *data);
+
+/**
+ * Walk (visit each) DHCP client configuration
+ *
+ * @param cb The callback function invoked as each client is visited
+ * @param ctx Context data passed back to the client in the invocation of
+ * the callback.
+ */
+extern void dhcp_client_walk (dhcp_client_walk_cb_t cb, void *ctx);