NdisGetReceivedPacket doesn't work in NDIS IM ????
- From: "Hien Nguyen" <thuchien@xxxxxxxxx>
- Date: Sat, 16 Apr 2005 14:13:02 -0700
I had try the passthruex part 2, but it not work properly. It doesnt filter
IP packet, event when I try testuiocrl to show the filter status, no IP
packet is proccesssed.
Then I try to modify it to filter ARP packet as follow. It can realize
ARP packet, it's fields. But when I try to modify the ARP packet. The
NdisGetReceivedPacket(pAdapt->BindingHandle, MacReceiveContext) doens't work
well, and I always see "No packet receive!" but the network still work well
and I can see the PtReceivePacket never work. What happens here???
The following is my code. In this FltFilterReceive, I modified to only filt
ARP packet, and I sure it work well. I test the driver in the ethernet
connection with router modem ADSL, the ARP packet of that modem, always add
18 byte as data of ARP packet. I try to modify this packet by strip this 18
bytes, only ARP header is encapsulate.
Thank you very much.
NDIS_STATUS
PtReceive(..)
{
....
[snip]
DbgPrint("===>PtReceive \n");
if ((!pAdapt->MiniportHandle) || (pAdapt->MPDeviceState >
NdisDeviceStateD0))
{
Status = NDIS_STATUS_FAILURE;
}
else do
{
// BEGIN_PTEX_FILTER
ULONG RcvFltAction;
RcvFltAction = FltFilterReceive(
pAdapt,
MacReceiveContext,
HeaderBuffer,
HeaderBufferSize,
LookAheadBuffer,
LookAheadBufferSize,
PacketSize
);
//
// Possibly Block (Drop) Packet
//
if( RcvFltAction & RCV_FLT_BLOCK_PACKET )
{
if (LookAheadBufferSize>sizeof(ArpHdr))
{
ulNewPayload=HeaderBufferSize+sizeof(ArpHdr);
Stt=NdisAllocateMemoryWithTag( &pNewPayload,
ulNewPayload,
TAG);
if (Stt!=NDIS_STATUS_SUCCESS)
{
DbgPrint("Can't Allocate memory ! Drop packet!");
Status=NDIS_STATUS_SUCCESS;
break;
}
memcpy( pNewPayload,
HeaderBuffer,
HeaderBufferSize);
memcpy( pNewPayload+HeaderBufferSize,
LookAheadBuffer,
sizeof(ArpHdr));
}
else DbgPrint("ARP packet have no data!, the length of packet is
%u", LookAheadBufferSize);
}
// END_PTEX_FILTER
Packet = NdisGetReceivedPacket(pAdapt->BindingHandle,
MacReceiveContext);
if (Packet==NULL) DbgPrint("No Packet receive!");
if (Packet != NULL)
{
DbgPrint("Have Packet!");
...[snip]
NdisDprAllocatePacket(&Status,
&MyPacket,
pAdapt->RecvPacketPoolHandle);
if (Status == NDIS_STATUS_SUCCESS)
{
PNDIS_BUFFER pNewNdisBfr;
DbgPrint("Allocate a packet from pool success");
if (pNewPayload==NULL)
{
DbgPrint("The payload do not need to modify");
MyPacket->Private.Head = Packet->Private.Head;
MyPacket->Private.Tail = Packet->Private.Tail;
}
else
{
DbgPrint("Allocate buffer for modified packet!");
NdisAllocateBuffer( &Status,
&pNewNdisBfr,
pAdapt->hRecvBufferPool,
pNewPayload,
ulNewPayload);
if (NDIS_STATUS_SUCCESS!=Status)
{
DbgPrint("PtReceivePacket() failed to get a buffer, drop
it!");
NdisFreeMemory( pNewPayload,
ulNewPayload,
0);
pNewPayload=NULL;
Status=NDIS_STATUS_SUCCESS;
break;
}
DbgPrint("Allocate buffer success!");
NdisChainBufferAtFront( MyPacket,
pNewNdisBfr
);
}
NDIS_SET_ORIGINAL_PACKET(MyPacket,
NDIS_GET_ORIGINAL_PACKET(Packet));
NDIS_SET_PACKET_HEADER_SIZE(MyPacket,
HeaderBufferSize);
NdisGetPacketFlags(MyPacket)=
NdisGetPacketFlags(Packet);
NdisGetPacketFlags(MyPacket) = NdisGetPacketFlags(Packet);
NDIS_SET_PACKET_STATUS(MyPacket, NDIS_STATUS_RESOURCES);
NdisMIndicateReceivePacket(pAdapt->MiniportHandle, &MyPacket, 1);
if (NULL!=pNewPayload) // Have unencapsulated payload?
{
DbgPrint("Success in set OOB data, new payload length is %u",ulNewPayload);
NdisFreeBuffer(pNewNdisBfr);
NdisFreeMemory( pNewPayload,
ulNewPayload,
0);
pNewPayload = NULL;
}
NdisDprFreePacket(MyPacket);
break;
}
}
else
{
//
// The miniport below us uses the old-style (not packet)
// receive indication. Fall through.
//
}
//
// Fall through if the miniport below us has either not
// indicated a packet or we could not allocate one
//
pAdapt->IndicateRcvComplete = TRUE;
....[snip]
.
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