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360 lines
10 KiB
360 lines
10 KiB
/*++
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Copyright (c) 1995 Microsoft Corporation
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Module Name:
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ntos\tdi\isn\fwd\netbios.c
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Abstract:
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Netbios packet processing
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Author:
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Vadim Eydelman
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Revision History:
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--*/
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#include "precomp.h"
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LIST_ENTRY NetbiosQueue;
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KSPIN_LOCK NetbiosQueueLock;
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WORK_QUEUE_ITEM NetbiosWorker;
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BOOLEAN NetbiosWorkerScheduled=FALSE;
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ULONG NetbiosPacketsQuota;
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ULONG MaxNetbiosPacketsQueued = DEF_MAX_NETBIOS_PACKETS_QUEUED;
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/*++
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*******************************************************************
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P r o c e s s N e t b i o s Q u e u e
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Routine Description:
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Process packets in the netbios broadcast queue (sends them on
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all interfaces in sequence)
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Arguments:
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Context - unused
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Return Value:
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None
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*******************************************************************
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--*/
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VOID
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ProcessNetbiosQueue (
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PVOID Context
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) {
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KIRQL oldIRQL;
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LIST_ENTRY tempQueue;
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KeAcquireSpinLock (&NetbiosQueueLock, &oldIRQL);
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// Check if there is something in the queue
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if (!IsListEmpty (&NetbiosQueue)) {
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// Move the queue to local variable
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InsertHeadList (&NetbiosQueue, &tempQueue);
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RemoveEntryList (&NetbiosQueue);
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InitializeListHead (&NetbiosQueue);
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KeReleaseSpinLock (&NetbiosQueueLock, oldIRQL);
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do {
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PLIST_ENTRY cur;
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PPACKET_TAG pktTag;
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cur = RemoveHeadList (&tempQueue);
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pktTag = CONTAINING_RECORD (cur, PACKET_TAG, PT_QueueLink);
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// Check if this packet has to be sent on other
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// interfaces
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if (!(pktTag->PT_Flags&PT_NB_DESTROY)) {
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PINTERFACE_CB dstIf = pktTag->PT_InterfaceReference;
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PUCHAR dataPtr = pktTag->PT_Data;
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UINT rtCount = *(dataPtr+IPXH_XPORTCTL);
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PUCHAR netListPtr;
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UINT i;
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if (dstIf==NULL) {
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// This is a brand new packet: not sent on any
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// interface yet
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USHORT dstSock = GETUSHORT (dataPtr+IPXH_DESTSOCK);
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// Check if we have a static route for this name
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// (offset to name depends on packet dest socket)
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if (dstSock==IPX_NETBIOS_SOCKET)
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dstIf = FindNBDestination (dataPtr+NB_NAME);
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else if (dstSock==IPX_SMB_NAME_SOCKET)
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dstIf = FindNBDestination (dataPtr+SMB_NAME);
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else
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dstIf = NULL;
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if (dstIf!=NULL) {
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// Static route found, make sure this packet
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// won't be sent on any other interface
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pktTag->PT_Flags |= PT_NB_DESTROY;
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InterlockedIncrement (&NetbiosPacketsQuota);
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// Make sure the packet has not traversed
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// this network already
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for (i=0, netListPtr=dataPtr+IPXH_HDRSIZE; i<rtCount; i++,netListPtr+=4) {
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if (GETULONG (netListPtr)==dstIf->ICB_Network)
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break;
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}
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// Make sure we are allowed to send on this
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// interface
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if ((dstIf!=InternalInterface)
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&& (i==rtCount) // Has not already traversed
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// this network
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&& IS_IF_ENABLED (dstIf)
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&& ((dstIf->ICB_NetbiosDeliver==FWD_NB_DELIVER_ALL)
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|| (dstIf->ICB_NetbiosDeliver
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==FWD_NB_DELIVER_STATIC)
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|| ((dstIf->ICB_NetbiosDeliver
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==FWD_NB_DELIVER_IF_UP)
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&& (dstIf->ICB_Stats.OperationalState
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==FWD_OPER_STATE_UP)))) {
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NOTHING;
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}
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else {
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// We have static route, but can't send it,
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// no point to propagate in on other interfaces
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// as well
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ReleaseInterfaceReference (dstIf);
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dstIf = NULL;
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goto FreePacket;
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}
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}
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else { // no static route
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goto FindNextInterface;
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}
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}
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else { // not a brand new packet (already sent on some
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// interfaces)
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FindNextInterface:
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// Loop through the interface list till we find
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// the one on which we can send
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while ((dstIf=GetNextInterfaceReference (dstIf))!=NULL) {
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// Check if we allowed to send on this interface
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if (IS_IF_ENABLED (dstIf)
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&& ((dstIf->ICB_NetbiosDeliver==FWD_NB_DELIVER_ALL)
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|| ((dstIf->ICB_NetbiosDeliver
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==FWD_NB_DELIVER_IF_UP)
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&& (dstIf->ICB_Stats.OperationalState
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==FWD_OPER_STATE_UP)))) {
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// Make sure the packet has not traversed
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// this network already
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for (i=0, netListPtr=dataPtr+IPXH_HDRSIZE; i<rtCount; i++,netListPtr+=4) {
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if (GETULONG (netListPtr)==dstIf->ICB_Network)
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break;
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}
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// Network was not in the list
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if (i==rtCount)
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break;
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}
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}
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}
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// Save the destination interface in the packet
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pktTag->PT_InterfaceReference = dstIf;
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// Go ahead and send if we have a valid destination
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if (dstIf!=NULL) {
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SendPacket (dstIf, pktTag);
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// The rest does not apply: if the packet was sent or
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// failed, it will be queued back to NetbiosQueue;
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// if it was queued to interface to be connected,
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// a copy of it will be queued to NetbiosQueue
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continue;
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}
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// else no more destinations to send this packet on
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}
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else { // Packet has to be destroyed
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if (pktTag->PT_InterfaceReference!=NULL)
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ReleaseInterfaceReference (pktTag->PT_InterfaceReference);
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}
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FreePacket:
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IpxFwdDbgPrint (DBG_NETBIOS, DBG_INFORMATION,
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("IpxFwd: No more interfaces for nb packet %08lx.\n",
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pktTag));
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if (MeasuringPerformance
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&& (pktTag->PT_PerfCounter!=0)) {
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LARGE_INTEGER PerfCounter = KeQueryPerformanceCounter (NULL);
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PerfCounter.QuadPart -= pktTag->PT_PerfCounter;
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KeAcquireSpinLock (&PerfCounterLock, &oldIRQL);
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PerfBlock.TotalNbPacketProcessingTime += PerfCounter.QuadPart;
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PerfBlock.NbPacketCounter += 1;
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if (PerfBlock.MaxNbPacketProcessingTime < PerfCounter.QuadPart)
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PerfBlock.MaxNbPacketProcessingTime = PerfCounter.QuadPart;
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KeReleaseSpinLock (&PerfCounterLock, oldIRQL);
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}
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if (!(pktTag->PT_Flags&PT_NB_DESTROY))
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InterlockedIncrement (&NetbiosPacketsQuota);
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FreePacket (pktTag);
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} while (!IsListEmpty (&tempQueue));
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KeAcquireSpinLock (&NetbiosQueueLock, &oldIRQL);
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if (IsListEmpty (&NetbiosQueue)
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|| !EnterForwarder ()) {
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NetbiosWorkerScheduled = FALSE;
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}
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else {
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ExQueueWorkItem (&NetbiosWorker, DelayedWorkQueue);
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}
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}
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KeReleaseSpinLock (&NetbiosQueueLock, oldIRQL);
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LeaveForwarder ();
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}
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/*++
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*******************************************************************
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P r o c e s s N e t b i o s P a c k e t
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Routine Description:
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Processes received netbios broadcast packet (checks network list
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and source filter, updates input statistics)
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Arguments:
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srcIf - interfae on which packet was received
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pktTag - netbios packet
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Return Value:
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None
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*******************************************************************
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--*/
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VOID
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ProcessNetbiosPacket (
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PINTERFACE_CB srcIf,
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PPACKET_TAG pktTag
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) {
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PUCHAR dataPtr, dataPtr2;
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UINT rtCount;
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UINT i, j;
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KIRQL oldIRQL;
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ULONG ulNetwork;
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dataPtr = pktTag->PT_Data;
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rtCount = *(dataPtr+IPXH_XPORTCTL);
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//
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// pmay: 264339: Make sure valid networks are listed
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//
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// We used to only verify that the source network was not
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// contained in the list. Now, we verify that 0 and 0xfffffff
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// are also absent.
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//
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for (i = 0, dataPtr += IPXH_HDRSIZE; i < rtCount; i++, dataPtr += 4)
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{
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ulNetwork = GETULONG (dataPtr);
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if ((srcIf->ICB_Network == ulNetwork) ||
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(ulNetwork == 0xffffffff) ||
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(ulNetwork == 0x0))
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{
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break;
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}
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}
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//
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// pmay: 272193
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//
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// nwlnknb on nt4 puts status bits into the first router slot in
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// the type 20 payload. As a consequence, the router has to
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// ignore the first slot when validating the router table so that nt4
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// client bcasts aren't dropped at the router.
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//
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if (rtCount == 0)
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{
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j = 1;
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dataPtr2 = dataPtr + 4;
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}
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else
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{
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j = i;
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dataPtr2 = dataPtr;
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}
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//
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// pmay: 264331
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//
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// Make sure the rest of the networks listed are zero
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//
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for (; j < 8; j++, dataPtr2 += 4)
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{
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ulNetwork = GETULONG (dataPtr2);
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if (ulNetwork != 0x0)
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{
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break;
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}
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}
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// We scaned the whole list and we haven't found it
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if ((i == rtCount) && (j == 8)) {
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FILTER_ACTION action;
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action = FltFilter (pktTag->PT_Data,
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GETUSHORT (pktTag->PT_Data+IPXH_LENGTH),
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srcIf->ICB_FilterInContext, NULL);
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// Apply the input filter
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if (action==FILTER_PERMIT) {
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InterlockedIncrement (&srcIf->ICB_Stats.NetbiosReceived);
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InterlockedIncrement (&srcIf->ICB_Stats.InDelivers);
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PUTULONG (srcIf->ICB_Network, dataPtr);
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*(pktTag->PT_Data+IPXH_XPORTCTL) += 1;
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IPX_NODE_CPY (pktTag->PT_Target.MacAddress, BROADCAST_NODE);
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// Initialize the packet
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pktTag->PT_InterfaceReference = NULL; // not yet sent on any
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// interfaces
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pktTag->PT_Flags = 0; // No flags
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QueueNetbiosPacket (pktTag);
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IpxFwdDbgPrint (DBG_NETBIOS, DBG_INFORMATION,
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("IpxFwd: Queued nb packet %08lx from if %ld.\n",
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pktTag, srcIf->ICB_Index));
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}
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else {
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ASSERT (action==FILTER_DENY_IN);
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IpxFwdDbgPrint (DBG_NETBIOS, DBG_WARNING,
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("IpxFwd: Filtered out nb packet %08lx"
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" from if %ld.\n", pktTag, srcIf->ICB_Index));
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InterlockedIncrement (&NetbiosPacketsQuota);
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InterlockedIncrement (&srcIf->ICB_Stats.InFiltered);
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FreePacket (pktTag);
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}
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}
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else {
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IpxFwdDbgPrint (DBG_NETBIOS, DBG_WARNING,
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("IpxFwd: Source net is already in nb packet %08lx"
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" from if %ld.\n", pktTag, srcIf->ICB_Index));
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InterlockedIncrement (&NetbiosPacketsQuota);
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InterlockedIncrement (&srcIf->ICB_Stats.InDiscards);
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FreePacket (pktTag);
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}
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ReleaseInterfaceReference (srcIf);
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}
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/*++
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*******************************************************************
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D e l e t e N e t b i o s Q u e u e
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Routine Description:
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Deletes the netbios bradcast queue
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Arguments:
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None
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Return Value:
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None
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*******************************************************************
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--*/
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VOID
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DeleteNetbiosQueue (
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void
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) {
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while (!IsListEmpty (&NetbiosQueue)) {
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PPACKET_TAG pktTag = CONTAINING_RECORD (NetbiosQueue.Flink,
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PACKET_TAG,
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PT_QueueLink);
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RemoveEntryList (&pktTag->PT_QueueLink);
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if (pktTag->PT_InterfaceReference!=NULL) {
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ReleaseInterfaceReference (pktTag->PT_InterfaceReference);
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}
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FreePacket (pktTag);
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}
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}
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