798 lines
20 KiB
C
798 lines
20 KiB
C
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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dltyp.h
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Abstract:
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This module includes all internal typedefs and constats
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of data link driver.
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Author:
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Antti Saarenheimo (o-anttis) 17-MAY-1991
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Revision History:
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--*/
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//
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// Design notes:
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// All data structures are designed at first for
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// multiple clients to make the interface very clean.
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// This implements also a simple kernel level interface
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// of data link layer to be used by somebody that needs it.
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//
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struct _LLC_NDIS_PACKET;
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typedef struct _LLC_NDIS_PACKET LLC_NDIS_PACKET, *PLLC_NDIS_PACKET;
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struct _LLC_SAP;
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typedef struct _LLC_SAP LLC_SAP, *PLLC_SAP;
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struct _DATA_LINK;
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typedef struct _DATA_LINK DATA_LINK, *PDATA_LINK;
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struct _ADAPTER_CONTEXT;
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typedef struct _ADAPTER_CONTEXT ADAPTER_CONTEXT, *PADAPTER_CONTEXT;
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//
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// LLC_GENERIC_OBJECT - these fields are common in all LLC objects
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//
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struct _LLC_GENERIC_OBJECT {
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//
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// DEBUG version - we have a 16-byte identifier header for consistency
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// checking and to help when looking at DLC using the kernel debugger
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//
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// DBG_OBJECT_ID;
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//
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// pointer to singly-linked list of same-type structures
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//
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PLLC_OBJECT pNext;
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//
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// ObjectType - SAP, DIRECT or LINK
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//
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UCHAR ObjectType;
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//
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// EthernetType - if we have opened the adapter binding in AUTO mode then
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// for SAPs and Link Stations we need to determine whether to talk 802.3
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// or DIX
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//
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UCHAR EthernetType;
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//
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// usReserved - just aligns to DWORD (not necessary)
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//
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USHORT usReserved;
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PADAPTER_CONTEXT pAdapterContext;
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PBINDING_CONTEXT pLlcBinding;
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//
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// hClientHandle - handle to LINK object in upper layer
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//
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PVOID hClientHandle;
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PLLC_PACKET pCompletionPackets;
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ULONG ReferenceCount;
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};
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typedef struct _LLC_GENERIC_OBJECT LLC_GENERIC_OBJECT, *PLLC_GENERIC_OBJECT;
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//
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// LLC_U_RESPONSE - LLC header for U-type response frame
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//
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typedef struct _LLC_U_RESPONSE {
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UCHAR Dsap; // Destination Service Access Point.
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UCHAR Ssap; // Source Service Access Point.
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UCHAR Command; // command code.
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UCHAR Info[1]; // respomse table
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} LLC_U_RESPONSE, *PLLC_U_RESPONSE;
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//
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// QUEUE_PACKET - generic doubly-linked list header
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//
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typedef struct _QUEUE_PACKET {
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struct _QUEUE_PACKET* pNext;
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struct _QUEUE_PACKET* pPrev;
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} QUEUE_PACKET, *PQUEUE_PACKET;
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//
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// LLC_QUEUE -
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//
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typedef struct _LLC_QUEUE {
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LIST_ENTRY ListEntry;
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LIST_ENTRY ListHead; // the list head
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PVOID pObject; // owner handle (used if element is linked)
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} LLC_QUEUE, *PLLC_QUEUE;
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//
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// This information is a part of the DLC.STATISTICS
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// information for a link station. The whole
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// strcuture can be reseted.
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//
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typedef struct _LINK_STATION_STATISTICS {
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USHORT I_FramesTransmitted;
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USHORT I_FramesReceived;
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UCHAR I_FrameReceiveErrors;
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UCHAR I_FrameTransmissionErrors;
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USHORT T1_ExpirationCount; // not in data xfer mode
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} LINK_STATION_STATISTICS, *PLINK_STATION_STATISTICS;
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typedef struct _SAP_STATISTICS {
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ULONG FramesTransmitted;
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ULONG FramesReceived;
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ULONG FramesDiscardedNoRcv;
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ULONG DataLostCounter;
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} SAP_STATISTICS, *PSAP_STATISTICS;
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struct _LLC_SAP {
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LLC_GENERIC_OBJECT Gen;
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USHORT SourceSap; // THIS MUST OVERLAY ObjectAddress
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USHORT OpenOptions;
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SAP_STATISTICS Statistics;
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//
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// KEEP THIS SAME IN SAP STATION AND GENERIC OBJECT
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//
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DLC_LINK_PARAMETERS DefaultParameters;
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NDIS_SPIN_LOCK FlowControlLock;
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PDATA_LINK pActiveLinks; // all link stations of this sap
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};
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struct _TIMER_TICK;
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typedef struct _TIMER_TICK TIMER_TICK, *PTIMER_TICK;
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typedef struct _LLC_TIMER {
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struct _LLC_TIMER* pNext;
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struct _LLC_TIMER* pPrev;
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PTIMER_TICK pTimerTick;
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ULONG ExpirationTime;
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PVOID hContext;
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#if defined(LOCK_CHECK)
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ULONG Disabled;
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#endif
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} LLC_TIMER, *PLLC_TIMER;
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struct _TIMER_TICK {
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struct _TIMER_TICK* pNext;
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// struct _TIMER_TICK* pPrev;
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PLLC_TIMER pFront;
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UINT DeltaTime;
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USHORT Input;
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USHORT ReferenceCount;
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};
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//
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// DATA_LINK - these 'objects' are from a two level data storage. The hash table
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// provides a very fast access to links, when there are less than 100 links
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// (about 99 % of the cases). The binary tree keeps the search times still quite
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// small, when there are very many connections from/to the same server.
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//
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struct _DATA_LINK {
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LLC_GENERIC_OBJECT Gen;
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//
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// Data link station state machine variables, *2 means the value
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// to be used as 2 increments, because modulo 256 is much easier
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// to handle than modulo 128. UCHAR wraps around automatically.
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//
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SHORT Is_Ct; // Max number of I retries (Update_Va & xxx_Chkpt)
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USHORT Ia_Ct; // Number of LPDU acknowledgements since Ww was incr.
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UCHAR State; // current state of the finite state machine
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UCHAR Ir_Ct; // LPDUs possible to send before next acknowledgement
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UCHAR Vs; // *2, Send state variable (Ns of next sent LPDU)
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UCHAR Vr; // *2, Receive state variable( Nr of next sent LPDU)
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UCHAR Pf; // value of PollFinal bit in last command
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UCHAR Va; // *2, Last valid Nr received (ack state variable)
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UCHAR Vp; // *2, Poll state var. (Ns of last sent cmd with P-bit)
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UCHAR Vb; // Busy state (Vl, Vb, Vlb)
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UCHAR Vc; // Stacked command variable (only DISC is possible)
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UCHAR Vi; // initialization state variable
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//
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// BEGIN OF DLC_LINK_PARAMETERS (same as llc_params struct)
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// DON'T TOUCH !!!!
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//
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UCHAR TimerT1; // Timer T1 value
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UCHAR TimerT2; // Timer T2 value
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UCHAR TimerTi; // Timer Ti value
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UCHAR MaxOut; // *2, maximum transmit window size (MaxOut)
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UCHAR RW; // maximum receive window size (MaxIn)
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UCHAR Nw; // number of LPDUs acknowledged, before Ww is incr.)
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UCHAR N2; // Number of retires allowed (both Polls and I LPDSs)
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UCHAR AccessPrty; // access priority
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USHORT MaxIField; // maximum received info field (not used in LLC)
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//
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// End of DLC_LINK_PARAMETERS
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//
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UCHAR Ww; // *2, working window size
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UCHAR N3; // number of I format LPDUs between acks (with Ir_Ct)
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UCHAR P_Ct; // Poll retry count
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UCHAR Nr; // last Nr of the received frame
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//
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// Variables needed to maintain dynamic response base time for timers.
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//
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USHORT LastTimeWhenCmdPollWasSent;
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USHORT AverageResponseTime;
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UCHAR cbLanHeaderLength;
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UCHAR VrDuringLocalBusy;
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UCHAR Flags;
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UCHAR TW; // dynamic MaxOut value
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USHORT FullWindowTransmits; // succeeded Polls of full window xmits
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UCHAR T1_Timeouts; // T1 timeouts after I-c1
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UCHAR RemoteOpen;
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//
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// The link status flags contains these status bits:
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//
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// DLC_WAITING_RESPONSE_TO_POLL
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// DLC_FIRST_POLL
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// DLC_ACTIVE_REMOTE_CONECT_REQUEST
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// DLC_COMMAND_POLL_PENDING_IN_NDIS;
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// DLC_SEND_DISABLED
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// DLC_SEND_ACTIVE
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// DLC_LOCAL_BUSY_BUFFER
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// DLC_LOCAL_BUSY_USER
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//
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//
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// the timer objects
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//
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LLC_TIMER T1;
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LLC_TIMER T2;
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LLC_TIMER Ti;
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LLC_QUEUE SendQueue; // untransmitted queue for the I frames
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LIST_ENTRY SentQueue; // the sent but not acknowledged I- frames
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PDATA_LINK pNextNode; // for the hash table
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LAN802_ADDRESS LinkAddr;// 64 bit lan address of the link
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PLLC_SAP pSap; // link to the SAP object of this link
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DLC_STATUS_TABLE DlcStatus;
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//
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// Resetable link station statistics counters
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//
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LINK_STATION_STATISTICS Statistics;
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UCHAR LastCmdOrRespSent;
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UCHAR LastCmdOrRespReceived;
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UCHAR Dsap; // Destination SAP
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UCHAR Ssap; // Source SAP
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//
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// some link statistics (don't reset this)
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//
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ULONG BufferCommitment;
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//
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// FramingType - type of framing (802.3/DIX/don't care) that we should use
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// for this connection. Required because in AUTO mode, the actual framing
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// type may be different than that in the BINDING_CONTEXT, and since the
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// BINDING_CONTEXT is per-adapter, we cannot rely on it (this whole thing
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// is screwed up)
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//
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ULONG FramingType;
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//
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// Network frame header (includes the full address information)
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//
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UCHAR auchLanHeader[1];
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//
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// LAN HEADER OVERFLOWS HERE !!!!
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//
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};
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typedef struct _LLC_STATION_OBJECT {
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LLC_GENERIC_OBJECT Gen;
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USHORT ObjectAddress;
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USHORT OpenOptions;
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SAP_STATISTICS Statistics;
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} LLC_STATION_OBJECT, *PLLC_STATION_OBJECT;
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union _LLC_OBJECT {
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//
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// KEEP THIS SAME AS DIRECT AND SAP STATIONS
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//
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LLC_GENERIC_OBJECT Gen;
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DATA_LINK Link;
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LLC_SAP Sap;
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LLC_STATION_OBJECT Group;
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LLC_STATION_OBJECT Dix;
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LLC_STATION_OBJECT Dir;
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};
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//*****************************************************************
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typedef struct _NDIS_MAC_PACKET {
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NDIS_PACKET_PRIVATE private;
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UCHAR auchMacReserved[16];
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} NDIS_MAC_PACKET;
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struct _LLC_NDIS_PACKET {
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NDIS_PACKET_PRIVATE private; // we accesss this also directly
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UCHAR auchMacReserved[16];
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PMDL pMdl; // MDL for LAN and LLC headers
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//
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// request handle and command completion handler are saved to
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// the packet until NDIS has completed the command
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//
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PLLC_PACKET pCompletionPacket;
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#if LLC_DBG
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ULONG ReferenceCount;
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#endif
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UCHAR auchLanHeader[LLC_MAX_LAN_HEADER + sizeof(LLC_U_HEADER) + sizeof(LLC_RESPONSE_INFO)];
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};
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typedef struct _LLC_TRANSFER_PACKET {
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NDIS_PACKET_PRIVATE private;
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UCHAR auchMacReserved[16];
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PLLC_PACKET pPacket;
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} LLC_TRANSFER_PACKET, *PLLC_TRANSFER_PACKET;
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typedef struct _EVENT_PACKET {
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struct _EVENT_PACKET* pNext;
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struct _EVENT_PACKET* pPrev;
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PBINDING_CONTEXT pBinding;
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PVOID hClientHandle;
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PVOID pEventInformation;
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UINT Event;
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UINT SecondaryInfo;
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} EVENT_PACKET, *PEVENT_PACKET;
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//
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// The next structure is used only in the allocating packets to the pool
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//
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typedef union _UNITED_PACKETS {
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QUEUE_PACKET queue;
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EVENT_PACKET event;
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LLC_PACKET XmitPacket;
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UCHAR auchLanHeader[LLC_MAX_LAN_HEADER];
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} UNITED_PACKETS, *PUNITED_PACKETS;
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//
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// NODE_ADDRESS - 6 byte MAC address expressed as bytes or ULONG & USHORT for
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// minimal comparisons/moves on 32-bit architecture
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//
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typedef union {
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UCHAR Bytes[6];
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struct {
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ULONG Top4;
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USHORT Bottom2;
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} Words;
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} NODE_ADDRESS, *PNODE_ADDRESS;
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//
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// FRAMING_DISCOVERY_CACHE_ENTRY - the solution to the LLC_ETHERNET_TYPE_AUTO
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// problem (where we can end up proliferating TEST/XIDs and SABME/UAs) is to
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// keep a cache of destinations we have 'ping'ed with TEST/XID/SABME. We send
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// both frame types - DIX and 802.3. We indicate the first received response
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// and create a cache entry, recording the remote MAC address and the framing
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// type. If another response frame arrives from the cached MAC address with
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// the other framing type, it is discarded
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//
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typedef struct {
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NODE_ADDRESS NodeAddress; // the remote MAC address
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BOOLEAN InUse; // TRUE if in use (could use TimeStamp == 0)
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UCHAR FramingType; // DIX or 802.3
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LARGE_INTEGER TimeStamp; // used for LRU throw-out
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} FRAMING_DISCOVERY_CACHE_ENTRY, *PFRAMING_DISCOVERY_CACHE_ENTRY;
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#define FRAMING_TYPE_DIX 0x1d // arbitrary value
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#define FRAMING_TYPE_802_3 0x83 // " "
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//
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// BINDING_CONTEXT - one of these created for each client (app/open driver
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// handle instance) opening the adapter. We only perform an open adapter at
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// NDIS level once, which creates the ADAPTER_CONTEXT for the NDIS open
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// adapter instance. Subsequent open adapter requests from processes cause
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// a BINDING_CONTEXT to be created and linked to the ADAPTER_CONTEXT
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//
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struct _BINDING_CONTEXT {
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//
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// DEBUG version - we have a 16-byte identifier header for consistency
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// checking and to help when looking at DLC using the kernel debugger
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//
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// DBG_OBJECT_ID;
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//
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// pointer to singly-linked list of BINDING_CONTEXT structures for this
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// ADAPTER_CONTEXT
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//
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struct _BINDING_CONTEXT* pNext;
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//
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// pointer to ADAPTER_CONTEXT structure for this BINDING_CONTEXT
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//
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PADAPTER_CONTEXT pAdapterContext;
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//
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// handle of/pointer to FILE_CONTEXT structure
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//
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PVOID hClientContext;
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//
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// pointers to command completion, receive and event indication functions
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//
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PFLLC_COMMAND_COMPLETE pfCommandComplete;
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PFLLC_RECEIVE_INDICATION pfReceiveIndication;
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PFLLC_EVENT_INDICATION pfEventIndication;
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//
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// Functional - functional address applied to this binding by the app
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//
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TR_BROADCAST_ADDRESS Functional;
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//
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// ulFunctionalZeroBits - mask of bits which should be off for functional
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// address/multicast address
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//
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ULONG ulFunctionalZeroBits;
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//
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// 0.5 second timer used for DIR.TIMER functions
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//
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LLC_TIMER DlcTimer;
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//
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// NdisMedium - the actual medium that the adapter to which we are bound talks
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//
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UINT NdisMedium;
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//
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// AddressTranslation - how the bits in addresses should be represented at
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// the top and bottom edges of LLC
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//
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USHORT AddressTranslation;
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//
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// BroadCastAddress - 6 byte broadcast address treated as USHORT and ULONG
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// entities. Used for checking promiscuous packets
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//
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USHORT usBroadcastAddress;
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ULONG ulBroadcastAddress;
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//
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// InternalAddressTranslation -
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//
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USHORT InternalAddressTranslation;
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//
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// EthernetType - value which determines the format of an Ethernet frame.
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// Different for 802.3 vs. DIX vs. ...
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//
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USHORT EthernetType;
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//
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// SwapCopiedLanAddresses - TRUE if we bit-swap LAN addresses when copying
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// up or down the layers
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//
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BOOLEAN SwapCopiedLanAddresses;
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//
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// The big substructures should be in the end
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// to produce optimal code for x86
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//
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LLC_TRANSFER_PACKET TransferDataPacket;
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//
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// FramingDiscoveryCacheEntries - maximum number of elements that can be
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// in DiscoveryFramingCache. Will be zero if the adapter is not ethernet and
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// LLC_ETHERNET_TYPE_AUTO was not requested, else number determined from
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// registry or default value. Number from registry may also be 0, indicating
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// caching is not to be used (old semantics)
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//
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ULONG FramingDiscoveryCacheEntries;
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//
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// FramingDiscoveryCache - if this EthernetType == LLC_ETHERNET_TYPE_AUTO,
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// we create a cache of destination MAC addresses and the DIX/802.3 framing
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// type they use. This array is FramingDiscoveryCacheEntries long
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//
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FRAMING_DISCOVERY_CACHE_ENTRY FramingDiscoveryCache[];
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};
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//
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// ADAPTER_CONTEXT - the device context of an NDIS driver. It includes links to
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// all dynamic data structures of the data link driver.
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//
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// This version does not support the group SAPs
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||
//
|
||
|
||
#define LINK_HASH_SIZE 128
|
||
|
||
struct _ADAPTER_CONTEXT {
|
||
|
||
//
|
||
// DEBUG version - we have a 16-byte identifier header for consistency
|
||
// checking and to help when looking at DLC using the kernel debugger
|
||
//
|
||
|
||
// DBG_OBJECT_ID;
|
||
|
||
//
|
||
// pointer to singly-linked list of ADAPTER_CONTEXT structures opened by
|
||
// all clients of this driver
|
||
//
|
||
|
||
struct _ADAPTER_CONTEXT* pNext;
|
||
|
||
#if !defined(DLC_UNILOCK)
|
||
|
||
NDIS_SPIN_LOCK SendSpinLock; // locked when accessing send queues
|
||
NDIS_SPIN_LOCK ObjectDataBase; // used also with sap/direct create
|
||
|
||
#endif
|
||
|
||
PLLC_STATION_OBJECT pDirectStation; // link list of direct stations
|
||
PBINDING_CONTEXT pBindings; // link list of all bindings
|
||
NDIS_HANDLE NdisBindingHandle;
|
||
PVOID hLinkPool; // pool for link station structs
|
||
PVOID hPacketPool; // pool for usr/small LLC packets
|
||
|
||
//
|
||
// circular link list is free NDIS packets for send (initially maybe 5)
|
||
//
|
||
|
||
PLLC_NDIS_PACKET pNdisPacketPool;
|
||
NDIS_HANDLE hNdisPacketPool;
|
||
|
||
//
|
||
// Some stuff for asynchronous receive indications
|
||
//
|
||
|
||
PVOID hReceiveCompletionRequest;
|
||
PLLC_PACKET pResetPackets;
|
||
NDIS_HANDLE MacReceiveContext;
|
||
|
||
//
|
||
// pHeadBuf - pointer to the MAC header buffer, containing:
|
||
//
|
||
// FDDI:
|
||
// 1 Byte Frame Control (FDDI)
|
||
// 6 Bytes Destination MAC Address (ALL)
|
||
// 6 Bytes Source MAC Address (ALL)
|
||
//
|
||
// Token Ring:
|
||
// 1 Byte Access Control (Token Ring)
|
||
// 1 Byte Frame Control (Token Ring)
|
||
// 6 Bytes Destination MAC Address (ALL)
|
||
// 6 Bytes Source MAC Address (ALL)
|
||
// 0-18 Bytes Source Routing
|
||
//
|
||
// Ethernet:
|
||
// 6 Bytes Destination MAC Address (ALL)
|
||
// 6 Bytes Source MAC Address (ALL)
|
||
// 2 Bytes Length or DIX Type
|
||
//
|
||
|
||
PUCHAR pHeadBuf;
|
||
|
||
//
|
||
// cbHeadBuf - number of bytes in pHeadBuf
|
||
//
|
||
|
||
UINT cbHeadBuf;
|
||
|
||
//
|
||
// pLookBuf - pointer to the MAC look-ahead buffer which contains the rest
|
||
// of the data for this frame or as much as the MAC could fit into the look
|
||
// ahead buffer (in which case NdisTransferData must be used to get the
|
||
// rest)
|
||
//
|
||
|
||
PUCHAR pLookBuf;
|
||
|
||
//
|
||
// cbLookBuf - number of bytes in pLookBuf
|
||
//
|
||
|
||
UINT cbLookBuf;
|
||
|
||
//
|
||
// cbPacketSize - actual size of the whole frame. Calculated from information
|
||
// in the header or supplied by the MAC, depending on the medium
|
||
//
|
||
|
||
UINT cbPacketSize;
|
||
|
||
//
|
||
// IsSnaDixFrame - true if the frame just received (on ethernet) is a DIX
|
||
// frame and the DIX identifier is 0x80D5 (big-endian)
|
||
//
|
||
|
||
UINT IsSnaDixFrame;
|
||
LAN802_ADDRESS Adapter;
|
||
ULONG MaxFrameSize;
|
||
ULONG LinkSpeed;
|
||
|
||
//
|
||
// We use UINTs, because (Move mem, ULONG) may not be an
|
||
// atomic operation (in theory)
|
||
//
|
||
|
||
UINT NdisMedium;
|
||
UINT XidTestResponses;
|
||
ULONG ObjectCount; // must be zero, when adapter closed
|
||
|
||
//
|
||
// ConfigInfo - holds the SwapAddressBits and UseDixOverEthernet flags and
|
||
// the timer tick values
|
||
//
|
||
|
||
ADAPTER_CONFIGURATION_INFO ConfigInfo;
|
||
|
||
//
|
||
// the original node addresses
|
||
//
|
||
|
||
ULONG ulBroadcastAddress;
|
||
|
||
USHORT usBroadcastAddress;
|
||
USHORT BackgroundProcessRequests;
|
||
|
||
UCHAR NodeAddress[6]; // Current network format
|
||
USHORT cbMaxFrameHeader;
|
||
|
||
UCHAR PermanentAddress[6];
|
||
USHORT OpenOptions;
|
||
|
||
USHORT AddressTranslationMode;
|
||
USHORT FrameType;
|
||
|
||
USHORT usRcvMask;
|
||
USHORT EthernetType;
|
||
|
||
USHORT RcvLanHeaderLength;
|
||
USHORT BindingCount;
|
||
|
||
USHORT usHighFunctionalBits;
|
||
|
||
//
|
||
// Keep UCHAR alignment
|
||
//
|
||
|
||
BOOLEAN boolTranferDataNotComplete;
|
||
BOOLEAN IsDirty;
|
||
BOOLEAN ResetInProgress;
|
||
UCHAR Unused1;
|
||
|
||
UCHAR AdapterNumber;
|
||
UCHAR IsBroadcast;
|
||
BOOLEAN SendProcessIsActive;
|
||
BOOLEAN LlcPacketInSendQueue;
|
||
|
||
//
|
||
// We keep the big structures and tables in the end,
|
||
// that makes most x86 offsets 1 byte instead of 4.
|
||
// The compiler aligns the fields naturally, whenever
|
||
// it is necessary.
|
||
//
|
||
|
||
//
|
||
// the next elements will be linked to circular
|
||
// end process link list, if there are any frames to send
|
||
//
|
||
|
||
LIST_ENTRY NextSendTask; // pointer to active sends
|
||
LIST_ENTRY QueueEvents;
|
||
LIST_ENTRY QueueCommands;
|
||
LLC_QUEUE QueueI;
|
||
LLC_QUEUE QueueDirAndU;
|
||
LLC_QUEUE QueueExpidited;
|
||
UNICODE_STRING Name; // current adapter name
|
||
PTIMER_TICK pTimerTicks;
|
||
|
||
NDIS_STATUS AsyncOpenStatus; // used to wait async open
|
||
NDIS_STATUS AsyncCloseResetStatus; // used to wait async close
|
||
NDIS_STATUS OpenCompleteStatus; // used to wait the first open
|
||
NDIS_STATUS LinkRcvStatus; // link state machine ret status
|
||
NDIS_STATUS NdisRcvStatus; // NdisRcvIndication ret status
|
||
NDIS_STATUS OpenErrorStatus; // special adapter open status
|
||
|
||
//
|
||
// NDIS calls back when adapter open completes. Use a Kernel Event to
|
||
// synchronize LLC with NDIS
|
||
//
|
||
|
||
KEVENT Event;
|
||
|
||
//
|
||
// the following are reasonably large arrays (like 256 pointers to SAP
|
||
// objects...)
|
||
//
|
||
|
||
PLLC_SAP apSapBindings[256]; // the clients bound to the SAPs
|
||
PDATA_LINK aLinkHash[LINK_HASH_SIZE]; // hash table to links
|
||
PLLC_STATION_OBJECT aDixStations[MAX_DIX_TABLE];
|
||
LLC_TRANSFER_PACKET TransferDataPacket;
|
||
|
||
#if DBG
|
||
|
||
//
|
||
// memory usage counters for memory owned by this ADAPTER_CONTEXT
|
||
//
|
||
|
||
MEMORY_USAGE MemoryUsage;
|
||
MEMORY_USAGE StringUsage;
|
||
|
||
#endif
|
||
|
||
};
|
||
|
||
typedef PLLC_PACKET (*PF_GET_PACKET)(IN PADAPTER_CONTEXT pAdapterContext);
|