140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
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/*++
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Copyright (c) 1990-1995 Microsoft Corporation
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Module Name:
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Loopback.c
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Abstract:
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This file contains the procedures for doing loopback of send
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packets for ndiswan. Loopback is being done in NdisWan because
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the NDIS wrapper could not meet all of the needs of NdisWan.
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Author:
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Tony Bell (TonyBe) January 25, 1996
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Environment:
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Kernel Mode
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Revision History:
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TonyBe 01/25/96 Created
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--*/
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#include "wan.h"
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#define __FILE_SIG__ LOOPBACK_FILESIG
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VOID
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NdisWanIndicateLoopbackPacket(
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PMINIPORTCB MiniportCB,
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PNDIS_PACKET NdisPacket
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)
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{
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ULONG BytesCopied, PacketLength;
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PRECV_DESC RecvDesc;
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PNDIS_PACKET LocalNdisPacket;
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PNDIS_BUFFER NdisBuffer;
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NDIS_STATUS Status;
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PCM_VCCB CmVcCB;
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KIRQL OldIrql;
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NdisWanDbgOut(DBG_TRACE, DBG_LOOPBACK, ("NdisWanIndicateLoopbackPacket: Enter"));
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NdisWanDbgOut(DBG_INFO, DBG_LOOPBACK, ("MiniportCB: 0x%p, NdisPacket: 0x%p",
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MiniportCB, NdisPacket));
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NdisQueryPacket(NdisPacket,
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NULL,
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NULL,
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NULL,
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&PacketLength);
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RecvDesc =
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NdisWanAllocateRecvDesc(PacketLength);
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if (RecvDesc == NULL) {
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return;
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}
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NdisWanCopyFromPacketToBuffer(NdisPacket,
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0,
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PacketLength,
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RecvDesc->StartBuffer,
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&BytesCopied);
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ASSERT(BytesCopied == PacketLength);
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if (MiniportCB->ProtocolType == PROTOCOL_IP) {
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UCHAR x[ETH_LENGTH_OF_ADDRESS];
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//
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// If this is IP we are going to assume
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// that wanarp has set the appropriate
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// bit requiring ndiswan to loopback the
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// packet so we must switch the src/dest
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// contexts.
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ETH_COPY_NETWORK_ADDRESS(x, &RecvDesc->StartBuffer[6]);
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ETH_COPY_NETWORK_ADDRESS(&RecvDesc->StartBuffer[6],
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&RecvDesc->StartBuffer[0]);
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ETH_COPY_NETWORK_ADDRESS(&RecvDesc->StartBuffer[0], x);
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}
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RecvDesc->CurrentLength = PacketLength;
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LocalNdisPacket =
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RecvDesc->NdisPacket;
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NdisBuffer =
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RecvDesc->NdisBuffer;
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//
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// Attach the buffers
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//
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NdisAdjustBufferLength(NdisBuffer,
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RecvDesc->CurrentLength);
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NdisRecalculatePacketCounts(LocalNdisPacket);
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CmVcCB =
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PMINIPORT_RESERVED_FROM_NDIS(NdisPacket)->CmVcCB;
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KeRaiseIrql(DISPATCH_LEVEL, &OldIrql);
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NDIS_SET_PACKET_STATUS(LocalNdisPacket, NDIS_STATUS_RESOURCES);
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INSERT_DBG_RECV(PacketTypeNdis, MiniportCB, NULL, NULL, LocalNdisPacket);
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//
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// Indicate the packet
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//
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if (CmVcCB != NULL) {
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NdisMCoIndicateReceivePacket(CmVcCB->NdisVcHandle,
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&LocalNdisPacket,
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1);
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} else {
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NdisMIndicateReceivePacket(MiniportCB->MiniportHandle,
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&LocalNdisPacket,
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1);
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}
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KeLowerIrql(OldIrql);
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#if DBG
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Status = NDIS_GET_PACKET_STATUS(LocalNdisPacket);
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ASSERT(Status == NDIS_STATUS_RESOURCES);
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#endif
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REMOVE_DBG_RECV(PacketTypeNdis, MiniportCB, LocalNdisPacket);
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NdisWanFreeRecvDesc(RecvDesc);
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NdisWanDbgOut(DBG_TRACE, DBG_LOOPBACK, ("NdisWanIndicateLoopbackPacket: Exit"));
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}
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