简单的防火墙驱动程序

/*++ Copyright(c) 1992-2000 Microsoft Corporation Module Name: protocol.c Abstract: Ndis Intermediate Miniport driver sample. This is a passthru driver. Author: Environment: Revision History: --*/ #include "precomp.h" #pragma hdrstop #define MAX_PACKET_POOL_SIZE 0x0000FFFF #define MIN_PACKET_POOL_SIZE 0x000000FF NDIS_STATUS AnalysisPacket(PNDIS_PACKET Packet, BOOLEAN bRecOrSend); // // NDIS version as 0xMMMMmmmm, where M=Major/m=minor (0x00050001 = 5.1); // initially unknown (0) // ULONG NdisDotSysVersion = 0x0; #define NDIS_SYS_VERSION_51 0x00050001 VOID PtBindAdapter( OUT PNDIS_STATUS Status, IN NDIS_HANDLE BindContext, IN PNDIS_STRING DeviceName, IN PVOID SystemSpecific1, IN PVOID SystemSpecific2 ) /*++ Routine Description: Called by NDIS to bind to a miniport below. Arguments: Status - Return status of bind here. BindContext - Can be passed to NdisCompleteBindAdapter if this call is pended. DeviceName - Device name to bind to. This is passed to NdisOpenAdapter. SystemSpecific1 - Can be passed to NdisOpenProtocolConfiguration to read per-binding information SystemSpecific2 - Unused Return Value: NDIS_STATUS_PENDING if this call is pended. In this case call NdisCompleteBindAdapter to complete. Anything else Completes this call synchronously --*/ { NDIS_HANDLE ConfigHandle = NULL; PNDIS_CONFIGURATION_PARAMETER Param; NDIS_STRING DeviceStr = NDIS_STRING_CONST("UpperBindings"); NDIS_STRING NdisVersionStr = NDIS_STRING_CONST("NdisVersion"); PADAPT pAdapt = NULL; NDIS_STATUS Sts; UINT MediumIndex; ULONG TotalSize; BOOLEAN NoCleanUpNeeded = FALSE; UNREFERENCED_PARAMETER(BindContext); UNREFERENCED_PARAMETER(SystemSpecific2); DBGPRINT(("==> Protocol BindAdapter\n")); do { // // Access the configuration section for our binding-specific // parameters. // NdisOpenProtocolConfiguration(Status, &ConfigHandle, SystemSpecific1); if (*Status != NDIS_STATUS_SUCCESS) { break; } if (NdisDotSysVersion == 0) { NdisReadConfiguration(Status, &Param, ConfigHandle, &NdisVersionStr, // "NdisVersion" NdisParameterInteger); if (*Status != NDIS_STATUS_SUCCESS) { break; } NdisDotSysVersion = Param->ParameterData.IntegerData; } // // Read the "UpperBindings" reserved key that contains a list // of device names representing our miniport instances corresponding // to this lower binding. Since this is a 1:1 IM driver, this key // contains exactly one name. // // If we want to implement a N:1 mux driver (N adapter instances // over a single lower binding), then UpperBindings will be a // MULTI_SZ containing a list of device names - we would loop through // this list, calling NdisIMInitializeDeviceInstanceEx once for // each name in it. // NdisReadConfiguration(Status, &Param, ConfigHandle, &DeviceStr, NdisParameterString); if (*Status != NDIS_STATUS_SUCCESS) { break; } // // Allocate memory for the Adapter structure. This represents both the // protocol context as well as the adapter structure when the miniport // is initialized. // // In addition to the base structure, allocate space for the device // instance string. // TotalSize = sizeof(ADAPT) + Param->ParameterData.StringData.MaximumLength; NdisAllocateMemoryWithTag(&pAdapt, TotalSize, TAG); if (pAdapt == NULL) { *Status = NDIS_STATUS_RESOURCES; break; } // // Initialize the adapter structure. We copy in the IM device // name as well, because we may need to use it in a call to // NdisIMCancelInitializeDeviceInstance. The string returned // by NdisReadConfiguration is active (i.e. available) only // for the duration of this call to our BindAdapter handler. // NdisZeroMemory(pAdapt, TotalSize); pAdapt->DeviceName.MaximumLength = Param->ParameterData.StringData.MaximumLength; pAdapt->DeviceName.Length = Param->ParameterData.StringData.Length; pAdapt->DeviceName.Buffer = (PWCHAR)((ULONG_PTR)pAdapt + sizeof(ADAPT)); NdisMoveMemory(pAdapt->DeviceName.Buffer, Param->ParameterData.StringData.Buffer, Param->ParameterData.StringData.MaximumLength); NdisInitializeEvent(&pAdapt->Event); NdisAllocateSpinLock(&pAdapt->Lock); // // Allocate a packet pool for sends. We need this to pass sends down. // We cannot use the same packet descriptor that came down to our send // handler (see also NDIS 5.1 packet stacking). // NdisAllocatePacketPoolEx(Status, &pAdapt->SendPacketPoolHandle, MIN_PACKET_POOL_SIZE, MAX_PACKET_POOL_SIZE - MIN_PACKET_POOL_SIZE, sizeof(SEND_RSVD)); if (*Status != NDIS_STATUS_SUCCESS) { break; } // // Allocate a packet pool for receives. We need this to indicate receives. // Same consideration as sends (see also NDIS 5.1 packet stacking). // NdisAllocatePacketPoolEx(Status, &pAdapt->RecvPacketPoolHandle, MIN_PACKET_POOL_SIZE, MAX_PACKET_POOL_SIZE - MIN_PACKET_POOL_SIZE, PROTOCOL_RESERVED_SIZE_IN_PACKET); if (*Status != NDIS_STATUS_SUCCESS) { break; } // // Now open the adapter below and complete the initialization // NdisOpenAdapter(Status, &Sts, &pAdapt->BindingHandle, &MediumIndex, MediumArray, sizeof(MediumArray)/sizeof(NDIS_MEDIUM), ProtHandle, pAdapt, DeviceName, 0, NULL); if (*Status == NDIS_STATUS_PENDING) { NdisWaitEvent(&pAdapt->Event, 0); *Status = pAdapt->Status; } if (*Status != NDIS_STATUS_SUCCESS) { break; } PtReferenceAdapt(pAdapt); #pragma prefast(suppress: __WARNING_POTENTIAL_BUFFER_OVERFLOW, "Ndis guarantees MediumIndex to be within bounds"); pAdapt->Medium = MediumArray[MediumIndex]; // // Now ask NDIS to initialize our miniport (upper) edge. // Set the flag below to synchronize with a