EthFilterIndicateReceive

This function is called by an NIC driver to indicate a received packet to all filter library database bindings associated with an Ethernet address.

At a Glance

Header file:	Ndis.h
Windows CE versions:	2.0 and later

Syntax

VOID EthFilterIndicateReceive( IN PETH_FILTER Filter,
IN NDIS_HANDLE MacReceiveContext, IN PCHAR Address,
IN PVOID HeaderBuffer, IN UINT HeaderBufferSize,
IN PVOID LookaheadBuffer, IN UINT LookaheadBufferSize,
IN UINT PacketSize );

Parameters

Filter: Pointer to a previously created and initialized filter library database.
MacReceiveContext: Specifies a context that the NIC driver associates with a packet received from the network.
Address: Pointer to the destination address that the NIC driver has already extracted from the received packet.
HeaderBuffer: Pointer to the virtual address of the virtually contiguous buffer containing the packet header. The buffer is valid only within the current call to this function.
HeaderBufferSize: Indicates the length, in bytes, of the packet header.
LookaheadBuffer: Pointer to the virtual address of the virtually contiguous buffer containing the first bytes of packet data. The packet buffer is valid only for the current call to this function.
LookaheadBufferSize: Specifies the size, in bytes, of the look-ahead buffer.
PacketSize: Specifies the size, in bytes, of the received packet data. This parameter number is not related to the look-ahead buffer, but rather indicates the size of the received packet data. This allows a protocol driver to call the NdisTransferData function and to transfer data in the packet, as necessary. The data length does not include the packet header length.

Remarks

Instead of calling NdisIndicateReceive without filtering, the NIC driver calls this function to filter a received packet so that only the appropriate bindings receive it. This function then calls the ProtocolReceive function of each protocol driver to which the binding filter applies.

In its calls to ProtocolReceive, this function passes each protocol driver a pointer to the packet header as well as a pointer to some or all of the packet data. The protocol driver can inspect the header and data in the packet, optionally copy as much of the header or data as is visible, or optionally call NdisTransferData to instruct the NIC driver to copy the data into a protocol-supplied packet.

A driver that calls this function runs at IRQL <= DISPATCH_LEVEL.