Filter Engine

The filter engine is a component of the Windows Filtering Platform that stores filters and performs filter arbitration. Filters are added to the filter engine at designated filtering layers so that the filter engine can perform the desired filtering action (permit, drop, or a callout). If a filter in the filter engine specifies a callout for the filter's action, the filter engine calls the callout's classifyFn function so that the callout can process the network data.