Checks the packet by the user-settable packet filtering program.

Syntax:

DWORD __stdcall BpfCheckPacket(HANDLE hFtr, LPVOID pPacket, DWORD PacketSize);

Parameters:

hFtr

[in] HNUserFilter object handle.

pPacket

[in] A pointer to the packet.

PacketSize

[in] The packet size.

Return values:

The function returns the values, defined in the BPF program within the BPF_RET instruction, or 0 in case of the wrong instruction.

Description:

Use the BpfCheckPacket function to test your user-settable packet filtering program.

Do the following:

• load (or generate) the packet into memory;
• call the BpfCheckPacket function, passing the packet address and size to it.

Use BpfCheckFilter function to check the user-settable packet filtering program accuracy.