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148 lines
3.5 KiB
148 lines
3.5 KiB
/*++
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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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VOID
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NdisWanQueueLoopbackPacket(
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PADAPTERCB AdapterCB,
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PNDIS_PACKET NdisPacket
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)
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{
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PLOOPBACK_DESC LoopbackDesc;
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ULONG AllocationSize, BufferLength;
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NdisWanDbgOut(DBG_TRACE, DBG_LOOPBACK, ("NdisWanQueueLoopbackPacket: Enter"));
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NdisWanDbgOut(DBG_INFO, DBG_LOOPBACK, ("AdapterCB: 0x%8.8x, NdisPacket: 0x%8.8x",
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AdapterCB, NdisPacket));
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//
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// Create a loopback descriptor
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//
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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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&BufferLength);
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AllocationSize = BufferLength + sizeof(LOOPBACK_DESC);
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NdisWanAllocateMemory(&LoopbackDesc, AllocationSize);
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if (LoopbackDesc != NULL) {
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ULONG BytesCopied;
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PDEFERRED_DESC DeferredDesc;
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//
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// For loopback we do not care about the bundlecb/protocolcb
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// states so they will remain NULL.
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//
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LoopbackDesc->AllocationSize = (USHORT)AllocationSize;
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LoopbackDesc->BufferLength = (USHORT)BufferLength;
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LoopbackDesc->Buffer = (PUCHAR)LoopbackDesc + sizeof(LOOPBACK_DESC);
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//
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// Copy the current packet
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//
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NdisWanCopyFromPacketToBuffer(NdisPacket,
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0,
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0xFFFFFFFF,
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LoopbackDesc->Buffer,
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&BytesCopied);
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ASSERT(BytesCopied == BufferLength);
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NdisAcquireSpinLock(&AdapterCB->Lock);
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NdisWanGetDeferredDesc(AdapterCB, &DeferredDesc);
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ASSERT(DeferredDesc != NULL);
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DeferredDesc->Context = (PVOID)LoopbackDesc;
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InsertTailDeferredQueue(&AdapterCB->DeferredQueue[Loopback], DeferredDesc);
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NdisWanSetDeferred(AdapterCB);
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NdisReleaseSpinLock(&AdapterCB->Lock);
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} else {
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NdisWanDbgOut(DBG_FAILURE, DBG_LOOPBACK, ("NdisWanQueueLoopbackPacket: Memory allocation failure!"));
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}
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}
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VOID
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NdisWanProcessLoopbacks(
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PADAPTERCB AdapterCB
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)
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{
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RECV_DESC RecvDesc;
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NdisWanDbgOut(DBG_TRACE, DBG_LOOPBACK, ("NdisWanIndicateLoopback: Enter"));
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NdisWanDbgOut(DBG_TRACE, DBG_LOOPBACK, ("NdisWanIndicateLoopback: AdapterCB 0x%8.8x", AdapterCB));
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while (!IsDeferredQueueEmpty(&AdapterCB->DeferredQueue[Loopback])) {
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PDEFERRED_DESC ReturnDesc;
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PLOOPBACK_DESC LoopbackDesc;
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ReturnDesc = RemoveHeadDeferredQueue(&AdapterCB->DeferredQueue[Loopback]);
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NdisReleaseSpinLock(&AdapterCB->Lock);
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LoopbackDesc = ReturnDesc->Context;
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NdisWanDbgOut(DBG_INFO, DBG_LOOPBACK, ("NdisWanIndicateLoopback: Desc 0x%8.8x", LoopbackDesc));
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RecvDesc.Flags = 0x4c4F4F50;
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RecvDesc.WanHeader = LoopbackDesc->Buffer;
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RecvDesc.WanHeaderLength = 14;
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RecvDesc.LookAhead = NULL;
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RecvDesc.LookAheadLength = 0;
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RecvDesc.CurrentBuffer = LoopbackDesc->Buffer + 14;
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RecvDesc.CurrentBufferLength = LoopbackDesc->BufferLength - 14;
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ASSERT((LONG)RecvDesc.CurrentBufferLength > 0);
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NdisMEthIndicateReceive(AdapterCB->hMiniportHandle,
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&RecvDesc,
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LoopbackDesc->Buffer,
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14,
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LoopbackDesc->Buffer + 14,
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LoopbackDesc->BufferLength - 14,
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LoopbackDesc->BufferLength - 14);
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NdisWanFreeMemory(LoopbackDesc);
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NdisAcquireSpinLock(&AdapterCB->Lock);
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AdapterCB->Flags |= RECEIVE_COMPLETE;
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InsertHeadDeferredQueue(&AdapterCB->FreeDeferredQueue, ReturnDesc);
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}
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}
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