Winpkfilter 90%

// Open filter device HANDLE hFilter = CreateFile(L"\\\\.\\PKTFLT", ...);

WinpkFilter inserts itself into the Windows network stack immediately below the network protocol drivers (such as TCP/IP) and directly above the Network Interface Card (NIC) miniport drivers. winpkfilter

While most developers turn to WinPcap, NPcap, or raw sockets, (from NTKernel) offers something unique: ✅ Kernel-level filtering before Windows networking stack processing ✅ Low overhead – ideal for firewalls, port blockers, or custom IDS ✅ No dependency on a separate driver like NDIS (it's a lightweight filter) // Open filter device HANDLE hFilter = CreateFile(L"\\\\

// Define the filter function NTSTATUS FilterPacket(PFILTER_PACKET packet) // Check if the packet's source IP address matches the filter criteria if (packet->IpHeader->SourceAddress == 0xC0A80001) // Drop the packet return FILTER_PACKET_DROP; or raw sockets