+always_inline vnet_sw_interface_t *
+vnet_get_sw_interface_safe (vnet_main_t * vnm, u32 sw_if_index)
+{
+ if (!pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
+ return pool_elt_at_index (vnm->interface_main.sw_interfaces, sw_if_index);
+ return (NULL);
+}
+