The filters operate on a per-application basis. A callout (see below) may implement any other action as required. It matches the data within a packet – as exposed by the shims – against filtering rules, and either blocks or permits the packet. Filtering engine, which spans both kernel-mode and user-mode, providing basic filtering capabilities.Internet Control Message Protocol (ICMP) shim.Application Layer Enforcement (ALE) shim.WFP comes with a set of shims users can register shims for other protocols using the API. Different shims exist for protocols at different layers. ![]() ![]() Shims, which expose the internal structure of a packet as properties.The filtering platform includes the following components:
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