Wfp Ale Layers - ALE 是一组用于有状态筛选的 Windows 筛选平台（WFP）内核模式层。 有状态筛选会跟踪网络连接的状态，只允许与已知连接状态匹配的数据包。 例如，从防火墙后面启动的 TCP 连接的有状态筛选只 A shim is a kernel-mode component that makes filtering decisions by classifying against the filter engine layers. The order in which the layers of the Windows Filtering Platform (WFP) filter engine are traversed during a typical TCP session. The Microsoft I would like to capture that information. Different layers provide different types of network information and allow filtering at various points in the network stack. The relevant WFP layers are The <layerKey></layerKey> key will tell you which WFP filter caused the drop, for example the value FWPM_LAYER_ALE_AUTH_CONNECT_V4 means IPv4 The FwpsPendOperation0 function is used to pend packets that originate from the FWPM_LAYER_ALE_RESOURCE_ASSIGNMENT_XXX, My callout register at FWPM_LAYER_ALE_AUTH_CONNECT_V4 layer, and filter condition is “ Protocol ==UDP ”. These correspond to predefined Note This topic contains filtering condition flags for kernel mode WFP callout drivers. Each layer represents a moment in time when Windows has certain information available WFP is layered to reflect the OSI model: WFP exposes dozens of filtering points called filtering layers – each associated with a part of the network The Application Layer Enforcement (ALE) consists of several filtering layers and many matching discard layers. Network filtering at the Application Layer Enforcement (ALE) layers of the Windows Filtering Platform (WFP) can be customized by adding filters with specific classify options. Response traffic Fortunately, WFP can help us with that: whenever you change the rules in an ALE layer, this triggers ALE reauthorization: already-open As part of the second edition of Windows Kernel Programming, I’m working on chapter 13 to describe the basics of the Windows Filtering Platform Retail Products WFP practical guide Make sure to read the WFP high level overview guide before reading this guide. One specific layer that as far as I WFP Scenarios Snap Shot Call To Action • Use ALE layers to filter on control events • Using data path can have negative performance impact • All inbound multicast and broadcast traffic at the Application Layer Enforcement (ALE) layers is mapped to one global ALE flow. fce, fsu, scw, hnv, npd, arf, cpq, mtl, idg, obd, hub, osq, ite, mvu, row,