1650 lines
38 KiB
C
1650 lines
38 KiB
C
/*++
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Copyright (c) 1997 - 98, Microsoft Corporation
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Module Name:
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rtmchng.c
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Abstract:
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Contains routines for giving out change
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notification registrations to entities
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registered with the RTM.
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Author:
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Chaitanya Kodeboyina (chaitk) 10-Sep-1998
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Revision History:
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--*/
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#include "pchrtm.h"
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#pragma hdrstop
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DWORD
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WINAPI
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RtmRegisterForChangeNotification (
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IN RTM_ENTITY_HANDLE RtmRegHandle,
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IN RTM_VIEW_SET TargetViews,
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IN RTM_NOTIFY_FLAGS NotifyFlags,
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IN PVOID NotifyContext,
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OUT PRTM_NOTIFY_HANDLE NotifyHandle
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)
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/*++
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Routine Description:
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Creates a new change notification using which the caller can
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receive notifications to changes in best route information.
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Arguments:
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RtmRegHandle - RTM registration handle for calling entity,
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TargetViews - Set of views in which changes are tracked,
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NotifyFlags - Flags that indicate the change types and
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dests (marked or all) caller is interested in,
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NotifyContext - Context for callback to indicate new changes,
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NotifyHandle - Handle to this notification info used in all
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subsequent calls - to get changes and so on.
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Return Value:
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Status of the operation
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--*/
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{
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PADDRFAM_INFO AddrFamInfo;
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PENTITY_INFO Entity;
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PNOTIFY_INFO Notif;
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BOOL LockInited;
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UINT i, j;
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DWORD Status;
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VALIDATE_ENTITY_HANDLE(RtmRegHandle, &Entity);
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AddrFamInfo = Entity->OwningAddrFamily;
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//
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// Is he interested in any change types supported ?
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//
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if ((NotifyFlags & RTM_CHANGE_TYPES_MASK) == 0)
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{
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return ERROR_INVALID_PARAMETER;
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}
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//
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// Is he interested in any non-supported views ?
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//
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if (TargetViews & ~AddrFamInfo->ViewsSupported)
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{
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return ERROR_NOT_SUPPORTED;
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}
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//
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// Create and initialize a change notification block
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//
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Notif = (PNOTIFY_INFO) AllocNZeroObject(sizeof(NOTIFY_INFO) +
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AddrFamInfo->MaxHandlesInEnum *
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sizeof(PDEST_INFO));
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if (Notif == NULL)
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{
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return ERROR_NOT_ENOUGH_MEMORY;
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}
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#if WRN
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Status = ERROR_GEN_FAILURE;
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#endif
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do
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{
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#if DBG_HDL
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Notif->NotifyHeader.ObjectHeader.TypeSign = NOTIFY_ALLOC;
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Notif->NotifyHeader.HandleType = NOTIFY_TYPE;
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#endif
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Notif->OwningEntity = Entity;
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Notif->TargetViews = TargetViews;
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Notif->NumberOfViews = NUMBER_OF_BITS(TargetViews);
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Notif->ChangeTypes = NotifyFlags;
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LockInited = FALSE;
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try
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{
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InitializeCriticalSection(&Notif->NotifyLock);
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LockInited = TRUE;
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}
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except(EXCEPTION_EXECUTE_HANDLER)
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{
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Status = GetLastError();
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break;
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}
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Notif->NotifyContext = NotifyContext;
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InitializeQueue(&Notif->NotifyDests, AddrFamInfo->MaxHandlesInEnum);
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Notif->CNIndex = -1;
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ACQUIRE_NOTIFICATIONS_WRITE_LOCK(AddrFamInfo);
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do
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{
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//
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// Do we have any space for a new change notification ?
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//
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if (AddrFamInfo->NumChangeNotifs >= AddrFamInfo->MaxChangeNotifs)
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{
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Status = ERROR_NO_SYSTEM_RESOURCES;
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break;
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}
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//
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// Search for an unused change notification (CN) slot
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//
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for (i = 0; i < AddrFamInfo->MaxChangeNotifs; i++)
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{
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if (AddrFamInfo->ChangeNotifsDir[i] == 0)
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{
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break;
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}
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}
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ASSERT(i < AddrFamInfo->MaxChangeNotifs);
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//
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// Reserve the CN index in the change notification dir
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//
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Notif->CNIndex = i;
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AddrFamInfo->ChangeNotifsDir[i] = Notif;
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AddrFamInfo->NumChangeNotifs++;
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//
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// Fill in the CN information for this index on AF
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//
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SET_BIT(AddrFamInfo->ChangeNotifRegns, i);
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// Do we indicate changes to marked dests only
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if (NotifyFlags & RTM_NOTIFY_ONLY_MARKED_DESTS)
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{
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SET_BIT(AddrFamInfo->CNsForMarkedDests, i);
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}
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//
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// Mark each view in which CN is interested
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//
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if (TargetViews == RTM_VIEW_MASK_ANY)
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{
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TargetViews = RTM_VIEW_MASK_ALL;
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}
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for (j = 0; TargetViews; j++)
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{
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if (TargetViews & 0x01)
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{
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SET_BIT(AddrFamInfo->CNsForView[j], i);
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}
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TargetViews >>= 1;
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}
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//
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// Mark change types in which CN is interested
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//
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for (j = 0; j < RTM_NUM_CHANGE_TYPES; j++)
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{
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if (NotifyFlags & 0x01)
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{
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SET_BIT(AddrFamInfo->CNsForChangeType[j], i);
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}
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NotifyFlags >>= 1;
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}
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}
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while (FALSE);
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RELEASE_NOTIFICATIONS_WRITE_LOCK(AddrFamInfo);
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if (Notif->CNIndex == -1)
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{
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break;
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}
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#if DBG_HDL
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//
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// Insert into list of handles opened by entity
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//
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ACQUIRE_OPEN_HANDLES_LOCK(Entity);
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InsertTailList(&Entity->OpenHandles, &Notif->NotifyHeader.HandlesLE);
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RELEASE_OPEN_HANDLES_LOCK(Entity);
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#endif
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REFERENCE_ENTITY(Entity, NOTIFY_REF);
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//
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// Make a handle to the notify block and return
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//
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*NotifyHandle = MAKE_HANDLE_FROM_POINTER(Notif);
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return NO_ERROR;
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}
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while (FALSE);
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//
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// Something failed - undo work done and return status
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//
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if (LockInited)
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{
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DeleteCriticalSection(&Notif->NotifyLock);
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}
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#if DBG_HDL
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Notif->NotifyHeader.ObjectHeader.TypeSign = NOTIFY_FREED;
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#endif
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FreeObject(Notif);
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*NotifyHandle = NULL;
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return Status;
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}
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DWORD
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WINAPI
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RtmGetChangedDests (
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IN RTM_ENTITY_HANDLE RtmRegHandle,
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IN RTM_NOTIFY_HANDLE NotifyHandle,
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IN OUT PUINT NumDests,
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OUT PRTM_DEST_INFO ChangedDests
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)
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/*++
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Routine Description:
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Get the next set of destinations whose best route information
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has changed.
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Arguments:
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RtmRegHandle - RTM registration handle for calling entity,
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NotifyHandle - Handle to the change notification,
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NumDests - Num. of DestInfo's in output is passed in,
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Num. of DestInfo's copied out is returned.
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ChangedDests - Output buffer where destination info is retd.
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Return Value:
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Status of the operation
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--*/
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{
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PADDRFAM_INFO AddrFamInfo;
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PENTITY_INFO Entity;
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PNOTIFY_INFO Notif;
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UINT DestInfoSize;
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UINT DestsInput;
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PDEST_INFO Dest;
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INT CnIndex;
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DWORD Status;
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//
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// Init the output params in case we fail validation
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//
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DestsInput = *NumDests;
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*NumDests = 0;
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//
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// Do some validation checks on the input params
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//
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VALIDATE_ENTITY_HANDLE(RtmRegHandle, &Entity);
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VALIDATE_NOTIFY_HANDLE(NotifyHandle, &Notif);
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AddrFamInfo = Entity->OwningAddrFamily;
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if (DestsInput > AddrFamInfo->MaxHandlesInEnum)
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{
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return ERROR_INVALID_PARAMETER;
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}
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DestInfoSize = RTM_SIZE_OF_DEST_INFO(Notif->NumberOfViews);
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CnIndex = Notif->CNIndex;
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Status = NO_ERROR;
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//
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// Get changed dests from the local queue on CN
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//
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ACQUIRE_CHANGE_NOTIFICATION_LOCK(Notif);
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while (*NumDests < DestsInput)
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{
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//
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// Get the next destination from the queue
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//
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DequeueItem(&Notif->NotifyDests, &Dest);
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if (Dest == NULL)
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{
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break;
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}
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#if DBG_TRACE
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if (TRACING_ENABLED(NOTIFY))
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{
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ULONG TempAddr, TempMask;
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RTM_IPV4_GET_ADDR_AND_MASK(TempAddr, TempMask, &Dest->DestAddress);
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Trace2(NOTIFY,"Returning dest %p to CN %d:", Dest, Notif->CNIndex);
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TracePrintAddress(NOTIFY, TempAddr, TempMask); Trace0(NOTIFY,"\n");
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}
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#endif
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ACQUIRE_DEST_WRITE_LOCK(Dest);
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// The queue bit for this CN should be set
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ASSERT(IS_BIT_SET(Dest->DestOnQueueBits, CnIndex));
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//
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// Do not copy dest if a change was ignored
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// after the dest was put on the queue - in which
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// case both Changed & OnQueue bits are set
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//
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if (IS_BIT_SET(Dest->DestChangedBits, CnIndex))
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{
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RESET_BIT(Dest->DestChangedBits, CnIndex);
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}
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else
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{
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//
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// Copy the dest information to output
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//
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GetDestInfo(Entity,
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Dest,
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RTM_BEST_PROTOCOL,
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Notif->TargetViews,
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ChangedDests);
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(*NumDests)++;
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ChangedDests =
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(PRTM_DEST_INFO) (DestInfoSize + (PUCHAR) ChangedDests);
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}
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// Reset bit as it has been pulled off the queue
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RESET_BIT(Dest->DestOnQueueBits, CnIndex);
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RELEASE_DEST_WRITE_LOCK(Dest);
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DEREFERENCE_DEST(Dest, NOTIFY_REF);
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}
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//
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// Do we have any more destinations in the queue ?
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//
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if ((*NumDests) == 0)
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{
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Status = ERROR_NO_MORE_ITEMS;
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}
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RELEASE_CHANGE_NOTIFICATION_LOCK(Notif);
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return Status;
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}
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DWORD
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WINAPI
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RtmReleaseChangedDests (
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IN RTM_ENTITY_HANDLE RtmRegHandle,
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IN RTM_NOTIFY_HANDLE NotifyHandle,
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IN UINT NumDests,
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IN PRTM_DEST_INFO ChangedDests
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)
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/*++
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Routine Description:
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Releases all handles present in the input dest info structures.
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Arguments:
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RtmRegHandle - RTM registration handle for calling entity,
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NotifyHandle - Handle to the change notification,
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NumDests - Number of dest info structures in buffer,
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ChangedDests - Array of dest info structures being released.
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Return Value:
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Status of the operation
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--*/
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{
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PENTITY_INFO Entity;
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UINT NumViews;
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UINT DestInfoSize;
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UINT i;
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DBG_VALIDATE_ENTITY_HANDLE(RtmRegHandle, &Entity);
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//
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// De-registration could have happened by now
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// so do not validate the notification handle
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//
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UNREFERENCED_PARAMETER(NotifyHandle);
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//
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// Get size of dest info in info array
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//
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NumViews = ((PRTM_DEST_INFO) ChangedDests)->NumberOfViews;
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DestInfoSize = RTM_SIZE_OF_DEST_INFO(NumViews);
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//
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// Dereference each dest info in array
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//
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for (i = 0; i < NumDests; i++)
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{
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RtmReleaseDestInfo(RtmRegHandle, ChangedDests);
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ChangedDests = (PRTM_DEST_INFO) (DestInfoSize + (PUCHAR) ChangedDests);
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}
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return NO_ERROR;
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}
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DWORD
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WINAPI
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RtmIgnoreChangedDests (
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IN RTM_ENTITY_HANDLE RtmRegHandle,
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IN RTM_NOTIFY_HANDLE NotifyHandle,
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IN UINT NumDests,
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IN PRTM_DEST_HANDLE ChangedDests
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)
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/*++
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Routine Description:
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Ignores the next change on each of the input destinations if
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it has already occurred.
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We do not take a lock on the notification here as we are not
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serializing this call with other RtmGetChangedDests calls.
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Arguments:
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RtmRegHandle - RTM registration handle for calling entity,
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NotifyHandle - Handle to the change notification,
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NumDests - Number of dest handles in buffer below,
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ChangedDests - Dests whose next change we are ignoring.
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Return Value:
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Status of the operation
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--*/
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{
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PENTITY_INFO Entity;
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PNOTIFY_INFO Notif;
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PDEST_INFO Dest;
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INT CnIndex;
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BOOL ChangedBit;
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BOOL OnQueueBit;
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UINT i;
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DBG_VALIDATE_ENTITY_HANDLE(RtmRegHandle, &Entity);
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VALIDATE_NOTIFY_HANDLE(NotifyHandle, &Notif);
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CnIndex = Notif->CNIndex;
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for (i = 0; i < NumDests; i++)
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{
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Dest = DEST_FROM_HANDLE(ChangedDests[i]);
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ACQUIRE_DEST_WRITE_LOCK(Dest);
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ChangedBit = IS_BIT_SET(Dest->DestChangedBits, CnIndex);
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OnQueueBit = IS_BIT_SET(Dest->DestOnQueueBits, CnIndex);
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if (ChangedBit && !OnQueueBit)
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{
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//
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// Dest on a changed list - reset the changed bit
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//
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RESET_BIT(Dest->DestChangedBits, CnIndex);
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//
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// If there are no more "changed bits" set on dest,
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// it is removed from the change list when the list
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// is processed next (in ProcessChangedDests call)
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//
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}
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else
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if (!ChangedBit && OnQueueBit)
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{
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//
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// Dest on queue - Invalidate by setting changed bit
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//
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SET_BIT(Dest->DestChangedBits, CnIndex);
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}
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RELEASE_DEST_WRITE_LOCK(Dest);
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}
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return NO_ERROR;
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}
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|
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|
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DWORD
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WINAPI
|
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RtmGetChangeStatus (
|
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IN RTM_ENTITY_HANDLE RtmRegHandle,
|
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IN RTM_NOTIFY_HANDLE NotifyHandle,
|
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IN RTM_DEST_HANDLE DestHandle,
|
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OUT PBOOL ChangeStatus
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)
|
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|
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/*++
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|
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Routine Description:
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|
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Checks if there are pending changes to be notified on a dest.
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Arguments:
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RtmRegHandle - RTM registration handle for calling entity,
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|
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NotifyHandle - Handle to the change notification,
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DestHandle - Dest whose change status we are querying,
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ChangedStatus - Change Status of this dest is returned.
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Return Value:
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Status of the operation
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--*/
|
|
|
|
{
|
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PENTITY_INFO Entity;
|
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PNOTIFY_INFO Notif;
|
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PDEST_INFO Dest;
|
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INT CnIndex;
|
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BOOL ChangedBit;
|
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BOOL OnQueueBit;
|
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|
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DBG_VALIDATE_ENTITY_HANDLE(RtmRegHandle, &Entity);
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|
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VALIDATE_NOTIFY_HANDLE(NotifyHandle, &Notif);
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VALIDATE_DEST_HANDLE(DestHandle, &Dest);
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CnIndex = Notif->CNIndex;
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ACQUIRE_DEST_READ_LOCK(Dest);
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ChangedBit = IS_BIT_SET(Dest->DestChangedBits, CnIndex);
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OnQueueBit = IS_BIT_SET(Dest->DestOnQueueBits, CnIndex);
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|
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RELEASE_DEST_READ_LOCK(Dest);
|
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|
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if (ChangedBit)
|
|
{
|
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if (OnQueueBit)
|
|
{
|
|
// The last change has been ignored
|
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|
|
*ChangeStatus = FALSE;
|
|
}
|
|
else
|
|
{
|
|
// A pending change to be notified
|
|
|
|
*ChangeStatus = TRUE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (OnQueueBit)
|
|
{
|
|
// A pending change to be notified
|
|
|
|
*ChangeStatus = TRUE;
|
|
}
|
|
else
|
|
{
|
|
// No changes available on this dest
|
|
|
|
*ChangeStatus = FALSE;
|
|
}
|
|
}
|
|
|
|
return NO_ERROR;
|
|
}
|
|
|
|
|
|
DWORD
|
|
WINAPI
|
|
RtmMarkDestForChangeNotification (
|
|
IN RTM_ENTITY_HANDLE RtmRegHandle,
|
|
IN RTM_NOTIFY_HANDLE NotifyHandle,
|
|
IN RTM_DEST_HANDLE DestHandle,
|
|
IN BOOL MarkDest
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Marks a destination to request notifications to changes to its
|
|
best route information on this change notification.
|
|
|
|
Arguments:
|
|
|
|
RtmRegHandle - RTM registration handle for calling entity,
|
|
|
|
NotifyHandle - Handle to the change notification,
|
|
|
|
DestHandle - Dest that we are marking for notifications,
|
|
|
|
MarkDest - Mark dest if TRUE, Unmark dest if FALSE
|
|
|
|
Return Value:
|
|
|
|
Status of the operation
|
|
|
|
--*/
|
|
|
|
{
|
|
PENTITY_INFO Entity;
|
|
PNOTIFY_INFO Notif;
|
|
PDEST_INFO Dest;
|
|
|
|
DBG_VALIDATE_ENTITY_HANDLE(RtmRegHandle, &Entity);
|
|
|
|
VALIDATE_NOTIFY_HANDLE(NotifyHandle, &Notif);
|
|
|
|
// VALIDATE_DEST_HANDLE(DestHandle, &Dest);
|
|
Dest = DEST_FROM_HANDLE(DestHandle);
|
|
if (!Dest)
|
|
{
|
|
return ERROR_INVALID_HANDLE;
|
|
}
|
|
|
|
//
|
|
// We make this check so that we can avoid taking
|
|
// the dest lock (which is dynamic) unnecessarily
|
|
//
|
|
|
|
if (IS_BIT_SET(Dest->DestMarkedBits, Notif->CNIndex))
|
|
{
|
|
//
|
|
// Reset mark bit on dest for this CN if reqd
|
|
//
|
|
|
|
if (!MarkDest)
|
|
{
|
|
ACQUIRE_DEST_WRITE_LOCK(Dest);
|
|
RESET_BIT(Dest->DestMarkedBits, Notif->CNIndex);
|
|
RELEASE_DEST_WRITE_LOCK(Dest);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// Set mark bit on dest for this CN if reqd
|
|
//
|
|
|
|
if (MarkDest)
|
|
{
|
|
ACQUIRE_DEST_WRITE_LOCK(Dest);
|
|
SET_BIT(Dest->DestMarkedBits, Notif->CNIndex);
|
|
RELEASE_DEST_WRITE_LOCK(Dest);
|
|
}
|
|
}
|
|
|
|
return NO_ERROR;
|
|
}
|
|
|
|
|
|
DWORD
|
|
WINAPI
|
|
RtmIsMarkedForChangeNotification (
|
|
IN RTM_ENTITY_HANDLE RtmRegHandle,
|
|
IN RTM_NOTIFY_HANDLE NotifyHandle,
|
|
IN RTM_DEST_HANDLE DestHandle,
|
|
OUT PBOOL DestMarked
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Checks if a dest has been marked (by a CN handle) for receving
|
|
notifications to changes in its best route information.
|
|
|
|
Arguments:
|
|
|
|
RtmRegHandle - RTM registration handle for calling entity,
|
|
|
|
NotifyHandle - Handle to the change notification,
|
|
|
|
DestHandle - Dest that we want to check is marked or not,
|
|
|
|
DestMarked - TRUE if marked, and FALSE if not.
|
|
|
|
Return Value:
|
|
|
|
Status of the operation
|
|
|
|
--*/
|
|
|
|
{
|
|
PENTITY_INFO Entity;
|
|
PNOTIFY_INFO Notif;
|
|
PDEST_INFO Dest;
|
|
|
|
DBG_VALIDATE_ENTITY_HANDLE(RtmRegHandle, &Entity);
|
|
|
|
VALIDATE_NOTIFY_HANDLE(NotifyHandle, &Notif);
|
|
|
|
// VALIDATE_DEST_HANDLE(DestHandle, &Dest);
|
|
Dest = DEST_FROM_HANDLE(DestHandle);
|
|
if (!Dest)
|
|
{
|
|
return ERROR_INVALID_HANDLE;
|
|
}
|
|
|
|
//
|
|
// Return the state of mark bit on the dest for CN
|
|
//
|
|
|
|
*DestMarked = IS_BIT_SET(Dest->DestMarkedBits, Notif->CNIndex);
|
|
|
|
return NO_ERROR;
|
|
}
|
|
|
|
|
|
DWORD
|
|
WINAPI
|
|
RtmDeregisterFromChangeNotification (
|
|
IN RTM_ENTITY_HANDLE RtmRegHandle,
|
|
IN RTM_NOTIFY_HANDLE NotifyHandle
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Deregisters a change notification and frees all resources
|
|
allocated to it. It also cleans up all information kept
|
|
in the destination for this particular notification index.
|
|
|
|
Arguments:
|
|
|
|
RtmRegHandle - RTM registration handle for calling entity,
|
|
|
|
NotifyHandle - Handle to notification being de-registered.
|
|
|
|
Return Value:
|
|
|
|
Status of the operation
|
|
|
|
--*/
|
|
|
|
{
|
|
PADDRFAM_INFO AddrFamInfo;
|
|
PENTITY_INFO Entity;
|
|
PNOTIFY_INFO Notif;
|
|
PDEST_INFO Dest;
|
|
UINT NumDests;
|
|
INT CNIndex;
|
|
UINT i;
|
|
DWORD Status;
|
|
RTM_NET_ADDRESS NetAddress;
|
|
RTM_VIEW_SET ViewSet;
|
|
PLOOKUP_LINKAGE DestData[DEFAULT_MAX_HANDLES_IN_ENUM];
|
|
|
|
|
|
VALIDATE_ENTITY_HANDLE(RtmRegHandle, &Entity);
|
|
|
|
AddrFamInfo = Entity->OwningAddrFamily;
|
|
|
|
|
|
VALIDATE_NOTIFY_HANDLE(NotifyHandle, &Notif);
|
|
|
|
//
|
|
// Remove this notification from CN regn's mask
|
|
// so that no more bits for this CN will be set
|
|
//
|
|
|
|
ACQUIRE_NOTIFICATIONS_WRITE_LOCK(AddrFamInfo);
|
|
|
|
CNIndex = Notif->CNIndex;
|
|
|
|
ASSERT(AddrFamInfo->ChangeNotifsDir[CNIndex] == Notif);
|
|
|
|
Notif->CNIndex = -1;
|
|
|
|
RESET_BIT(AddrFamInfo->ChangeNotifRegns, CNIndex);
|
|
|
|
//
|
|
// Reset other bits that refer to the CN's state
|
|
//
|
|
|
|
// Unmark state whether this CN need marked dests
|
|
|
|
RESET_BIT(AddrFamInfo->CNsForMarkedDests, CNIndex);
|
|
|
|
// Unmark interest of this CN in each view
|
|
|
|
ViewSet = RTM_VIEW_MASK_ALL;
|
|
|
|
for (i = 0; ViewSet; i++)
|
|
{
|
|
if (ViewSet & 0x01)
|
|
{
|
|
RESET_BIT(AddrFamInfo->CNsForView[i], CNIndex);
|
|
}
|
|
|
|
ViewSet >>= 1;
|
|
}
|
|
|
|
// Unmark CN's interest in each change type
|
|
|
|
for (i = 0; i < RTM_NUM_CHANGE_TYPES; i++)
|
|
{
|
|
RESET_BIT(AddrFamInfo->CNsForChangeType[i], CNIndex);
|
|
}
|
|
|
|
RELEASE_NOTIFICATIONS_WRITE_LOCK(AddrFamInfo);
|
|
|
|
//
|
|
// Cleanup the notification's "DestChanged" bits
|
|
//
|
|
|
|
ProcessChangedDestLists(AddrFamInfo, FALSE);
|
|
|
|
//
|
|
// Reset the CN's marked bits on all the dests
|
|
//
|
|
|
|
ZeroMemory(&NetAddress, sizeof(RTM_NET_ADDRESS));
|
|
|
|
do
|
|
{
|
|
NumDests = DEFAULT_MAX_HANDLES_IN_ENUM;
|
|
|
|
ACQUIRE_ROUTE_TABLE_READ_LOCK(AddrFamInfo);
|
|
|
|
Status = EnumOverTable(AddrFamInfo->RouteTable,
|
|
&NetAddress.NumBits,
|
|
NetAddress.AddrBits,
|
|
NULL,
|
|
0,
|
|
NULL,
|
|
&NumDests,
|
|
DestData);
|
|
|
|
for (i = 0; i < NumDests; i++)
|
|
{
|
|
Dest = CONTAINING_RECORD(DestData[i], DEST_INFO, LookupLinkage);
|
|
|
|
if (IS_BIT_SET(Dest->DestMarkedBits, CNIndex))
|
|
{
|
|
LOCKED_RESET_BIT(Dest->DestMarkedBits, CNIndex);
|
|
}
|
|
}
|
|
|
|
RELEASE_ROUTE_TABLE_READ_LOCK(AddrFamInfo);
|
|
}
|
|
while (SUCCESS(Status));
|
|
|
|
//
|
|
// Now remove the CN completely from dir of CNs
|
|
//
|
|
|
|
ACQUIRE_NOTIFICATIONS_WRITE_LOCK(AddrFamInfo);
|
|
|
|
AddrFamInfo->ChangeNotifsDir[CNIndex] = NULL;
|
|
|
|
AddrFamInfo->NumChangeNotifs--;
|
|
|
|
RELEASE_NOTIFICATIONS_WRITE_LOCK(AddrFamInfo);
|
|
|
|
//
|
|
// Deference any destinations on the CN's queue
|
|
//
|
|
|
|
while (TRUE)
|
|
{
|
|
//
|
|
// Get the next destination from the queue
|
|
//
|
|
|
|
DequeueItem(&Notif->NotifyDests, &Dest);
|
|
|
|
if (Dest == NULL)
|
|
{
|
|
break;
|
|
}
|
|
|
|
// Reset the "on CN's queue" bit on dest
|
|
|
|
if (IS_BIT_SET(Dest->DestOnQueueBits, CNIndex))
|
|
{
|
|
LOCKED_RESET_BIT(Dest->DestOnQueueBits, CNIndex);
|
|
}
|
|
|
|
DEREFERENCE_DEST(Dest, NOTIFY_REF);
|
|
}
|
|
|
|
//
|
|
// Free all resources allocated to this CN
|
|
//
|
|
|
|
DeleteCriticalSection(&Notif->NotifyLock);
|
|
|
|
#if DBG_HDL
|
|
//
|
|
// Remove from the list of handles opened by entity
|
|
//
|
|
|
|
ACQUIRE_OPEN_HANDLES_LOCK(Entity);
|
|
RemoveEntryList(&Notif->NotifyHeader.HandlesLE);
|
|
RELEASE_OPEN_HANDLES_LOCK(Entity);
|
|
#endif
|
|
|
|
DEREFERENCE_ENTITY(Entity, NOTIFY_REF);
|
|
|
|
// Free memory allocated for notification and return
|
|
|
|
#if DBG_HDL
|
|
Notif->NotifyHeader.ObjectHeader.TypeSign = NOTIFY_FREED;
|
|
#endif
|
|
|
|
FreeObject(Notif);
|
|
|
|
return NO_ERROR;
|
|
}
|
|
|
|
|
|
DWORD
|
|
ComputeCNsToBeNotified (
|
|
IN PADDRFAM_INFO AddrFamInfo,
|
|
IN DWORD DestMarkedBits,
|
|
IN DWORD *ViewsForChangeType
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Computes the set of change notification registrations that
|
|
need to be notified when the best route to a particular
|
|
destination changes.
|
|
|
|
Arguments:
|
|
|
|
AddrFamInfo - Address family that has the CN regn info,
|
|
|
|
DestMarkedBits - CN's that marked for changes this dest
|
|
or the dest's parent if it's a new dest
|
|
|
|
ViewsForChangeType
|
|
- Views in which change of a type occurred.
|
|
|
|
Return Value:
|
|
|
|
CNs that need to be notified of this change.
|
|
|
|
Locks:
|
|
|
|
Called with ChangeNotifsLock in AddrFamInfo in READ mode
|
|
as this protects CN regn info from changing while we are
|
|
reading it.
|
|
|
|
--*/
|
|
|
|
{
|
|
RTM_VIEW_SET ViewSet;
|
|
DWORD FilterCNs;
|
|
DWORD CNsForCT;
|
|
UINT i, j;
|
|
DWORD NotifyCNs;
|
|
|
|
//
|
|
// Either a CN has marked the dest, or wants all changes
|
|
//
|
|
|
|
NotifyCNs = DestMarkedBits | ~AddrFamInfo->CNsForMarkedDests;
|
|
|
|
if (NotifyCNs == 0)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
// The CNs not in this bit-mask should not be notified
|
|
|
|
FilterCNs = NotifyCNs;
|
|
|
|
|
|
NotifyCNs = 0;
|
|
|
|
for (i = 0; i < RTM_NUM_CHANGE_TYPES; i++)
|
|
{
|
|
//
|
|
// For each change type, get all CN's that can be notified
|
|
//
|
|
|
|
// See what views this change type (CT) applies to
|
|
|
|
CNsForCT = 0;
|
|
|
|
ViewSet = ViewsForChangeType[i];
|
|
|
|
for (j = 0; ViewSet; j++)
|
|
{
|
|
// For each view, get all interested CN's
|
|
|
|
if (ViewSet & 0x01)
|
|
{
|
|
CNsForCT |= AddrFamInfo->CNsForView[j];
|
|
}
|
|
|
|
ViewSet >>= 1;
|
|
}
|
|
|
|
// Now see which CNs are actually interested in CT
|
|
|
|
CNsForCT &= AddrFamInfo->CNsForChangeType[i];
|
|
|
|
// Add these CNs to the CNs need to be notified
|
|
|
|
NotifyCNs |= CNsForCT;
|
|
|
|
//
|
|
// If we have to notify all CNs, we are done here
|
|
//
|
|
|
|
if (NotifyCNs == AddrFamInfo->ChangeNotifRegns)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Apply the filer of CNs you stored away earlier
|
|
//
|
|
|
|
NotifyCNs &= FilterCNs;
|
|
|
|
return NotifyCNs;
|
|
}
|
|
|
|
|
|
DWORD
|
|
AddToChangedDestLists (
|
|
IN PADDRFAM_INFO AddrFamInfo,
|
|
IN PDEST_INFO Dest,
|
|
IN DWORD NotifyCNs
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Add a destination to a list of changed dests on address
|
|
family, and sets the appropriate state in dest.
|
|
|
|
Arguments:
|
|
|
|
AddrFamInfo - The address family holding the change-list,
|
|
|
|
Dest - Pointer to the dest that has changed,
|
|
|
|
NotifyCNs - CNs that need to be notified of this change.
|
|
|
|
Return Value:
|
|
|
|
Status of the operation
|
|
|
|
Locks:
|
|
|
|
Called with destination lock held in WRITE mode as we are
|
|
updating the DestChanged and DestOnQueue bits on it. This
|
|
lock also protects the change list linkage.In other words
|
|
you need to have the dest lock for inserting or removing
|
|
from a change list.
|
|
|
|
Also called with ChangeNotifsLock in AddrFamInfo in READ
|
|
mode as this protects CN registration info from changing
|
|
while we are adding to the list. If we do not take this
|
|
lock, we might end up adding to the change list after an
|
|
entity has de-registered from notifications. See code in
|
|
RtmDeregisterFromChangeNotification.
|
|
|
|
--*/
|
|
|
|
{
|
|
SINGLE_LIST_ENTRY *ListPtr;
|
|
UINT ListNum;
|
|
BOOL Success;
|
|
|
|
//
|
|
// Set change bits to 1 if not already on queue
|
|
//
|
|
|
|
Dest->DestChangedBits |= (NotifyCNs & ~Dest->DestOnQueueBits);
|
|
|
|
//
|
|
// Reset change bits to 0 if already on queue
|
|
//
|
|
|
|
Dest->DestChangedBits &= ~(NotifyCNs & Dest->DestOnQueueBits);
|
|
|
|
//
|
|
// Push dest into the change list if it is not
|
|
// already on the list and we have new changes
|
|
//
|
|
|
|
if ((Dest->ChangeListLE.Next == NULL) &&
|
|
(Dest->DestChangedBits & ~Dest->DestOnQueueBits))
|
|
{
|
|
// Get the change list to insert the dest in
|
|
|
|
ListNum = CHANGE_LIST_TO_INSERT(Dest);
|
|
|
|
//
|
|
// Note that we take a lock on changes list
|
|
// only if the dest (which is locked) isn't
|
|
// already on the list, else could deadlock
|
|
// with the code in ProcessChangedDestLists
|
|
//
|
|
|
|
#if DBG_TRACE
|
|
if (TRACING_ENABLED(NOTIFY))
|
|
{
|
|
ULONG TempAddr, TempMask;
|
|
|
|
RTM_IPV4_GET_ADDR_AND_MASK(TempAddr, TempMask, &Dest->DestAddress);
|
|
Trace2(NOTIFY,"Adding dest %p to change list %d: ", Dest, ListNum);
|
|
TracePrintAddress(NOTIFY, TempAddr, TempMask); Trace0(NOTIFY,"\n");
|
|
}
|
|
#endif
|
|
|
|
ACQUIRE_CHANGED_DESTS_LIST_LOCK(AddrFamInfo, ListNum);
|
|
|
|
//
|
|
// Insert the item at the end of the list
|
|
// and update the pointer to the list end
|
|
//
|
|
|
|
ListPtr = AddrFamInfo->ChangeLists[ListNum].ChangedDestsTail;
|
|
|
|
PushEntryList(ListPtr, &Dest->ChangeListLE);
|
|
|
|
AddrFamInfo->ChangeLists[ListNum].ChangedDestsTail =
|
|
&Dest->ChangeListLE;
|
|
|
|
RELEASE_CHANGED_DESTS_LIST_LOCK(AddrFamInfo, ListNum);
|
|
|
|
REFERENCE_DEST(Dest, NOTIFY_REF);
|
|
|
|
//
|
|
// Activate a timer if it is not already done.
|
|
// This is done with the dest lock held so the
|
|
// dest doesn't get removed before this code.
|
|
//
|
|
|
|
if (InterlockedIncrement(&AddrFamInfo->NumChangedDests) == 1)
|
|
{
|
|
//
|
|
// Create a periodic notifications timer
|
|
//
|
|
|
|
ACQUIRE_NOTIF_TIMER_LOCK(AddrFamInfo);
|
|
|
|
ASSERT(AddrFamInfo->ChangeNotifTimer == NULL);
|
|
|
|
do
|
|
{
|
|
Success = CreateTimerQueueTimer(&AddrFamInfo->ChangeNotifTimer,
|
|
AddrFamInfo->NotifTimerQueue,
|
|
ProcessChangedDestLists,
|
|
AddrFamInfo,
|
|
TIMER_CALLBACK_FREQUENCY,
|
|
TIMER_CALLBACK_FREQUENCY,
|
|
0);
|
|
if (Success)
|
|
{
|
|
break;
|
|
}
|
|
|
|
// Should not happen - but try again
|
|
|
|
Sleep(0);
|
|
}
|
|
while (TRUE);
|
|
|
|
RELEASE_NOTIF_TIMER_LOCK(AddrFamInfo);
|
|
}
|
|
}
|
|
|
|
return NO_ERROR;
|
|
}
|
|
|
|
|
|
VOID
|
|
NTAPI
|
|
ProcessChangedDestLists (
|
|
IN PVOID Context,
|
|
IN BOOLEAN TimeOut
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Processes the lists of changes on the address family, and
|
|
populates the per CN queues of changed destinations. If a
|
|
dest is distributed to queues of all interested CNs, it is
|
|
removed from the change list on address family to which it
|
|
belonged.
|
|
|
|
Arguments:
|
|
|
|
AddrFamInfo - The address family holding the change-list.
|
|
|
|
TimeOut - TRUE if called from a timer, FALSE if not
|
|
|
|
Return Value:
|
|
|
|
None
|
|
|
|
--*/
|
|
|
|
{
|
|
PADDRFAM_INFO AddrFamInfo;
|
|
RTM_ENTITY_HANDLE EntityHandle;
|
|
PSINGLE_LIST_ENTRY ListPtr, TempList;
|
|
PSINGLE_LIST_ENTRY Prev, Curr;
|
|
RTM_EVENT_CALLBACK NotifyCallback;
|
|
PNOTIFY_INFO Notif;
|
|
PDEST_INFO Dest;
|
|
UINT ListNum;
|
|
UINT NumDests, i;
|
|
INT NumDestsRemoved;
|
|
DWORD ActualChangedBits;
|
|
DWORD NotifyChanges;
|
|
BOOL QueueEmpty, QueueFull;
|
|
ULONG ThreadId;
|
|
PLONG ListInUse;
|
|
BOOL Success;
|
|
|
|
UNREFERENCED_PARAMETER(TimeOut);
|
|
DBG_UNREFERENCED_LOCAL_VARIABLE(ThreadId);
|
|
|
|
#if DBG_TRACE
|
|
ThreadId = HandleToUlong(NtCurrentTeb()->ClientId.UniqueThread);
|
|
|
|
if (TRACING_ENABLED(NOTIFY))
|
|
{
|
|
Trace1(NOTIFY, "Entering ProcessChangedDestLists: %lu", ThreadId);
|
|
}
|
|
#endif
|
|
|
|
AddrFamInfo = (PADDRFAM_INFO) Context;
|
|
|
|
NotifyChanges = 0;
|
|
|
|
NumDestsRemoved = 0;
|
|
|
|
ACQUIRE_NOTIFICATIONS_READ_LOCK(AddrFamInfo);
|
|
|
|
for (ListNum = 0; ListNum < NUM_CHANGED_DEST_LISTS; ListNum++)
|
|
{
|
|
//
|
|
// Check if this list is already being processed
|
|
//
|
|
|
|
ListInUse = &AddrFamInfo->ChangeLists[ListNum].ChangesListInUse;
|
|
|
|
if (InterlockedIncrement(ListInUse) != 1)
|
|
{
|
|
InterlockedDecrement(ListInUse);
|
|
continue;
|
|
}
|
|
|
|
//
|
|
// Move all items in the list to a temp list
|
|
//
|
|
|
|
ListPtr = &AddrFamInfo->ChangeLists[ListNum].ChangedDestsHead;
|
|
|
|
ACQUIRE_CHANGED_DESTS_LIST_LOCK(AddrFamInfo, ListNum);
|
|
|
|
TempList = ListPtr->Next;
|
|
|
|
ListPtr->Next = ListPtr;
|
|
|
|
AddrFamInfo->ChangeLists[ListNum].ChangedDestsTail = ListPtr;
|
|
|
|
RELEASE_CHANGED_DESTS_LIST_LOCK(AddrFamInfo, ListNum);
|
|
|
|
//
|
|
// Process each destination in the temp list
|
|
//
|
|
|
|
Prev = CONTAINING_RECORD(&TempList, SINGLE_LIST_ENTRY, Next);
|
|
|
|
Curr = Prev->Next;
|
|
|
|
NumDests = 0;
|
|
|
|
while (Curr != ListPtr)
|
|
{
|
|
// Get the next destination on the list
|
|
|
|
Dest = CONTAINING_RECORD(Curr, DEST_INFO, ChangeListLE);
|
|
|
|
#if DBG_TRACE
|
|
if (TRACING_ENABLED(NOTIFY))
|
|
{
|
|
ULONG Addr, Mask;
|
|
|
|
RTM_IPV4_GET_ADDR_AND_MASK(Addr, Mask, &Dest->DestAddress);
|
|
Trace2(NOTIFY, "Next dest %p in list %d: ", Dest, ListNum);
|
|
TracePrintAddress(NOTIFY, Addr, Mask); Trace0(NOTIFY,"\n");
|
|
}
|
|
#endif
|
|
ACQUIRE_DEST_WRITE_LOCK(Dest);
|
|
|
|
//
|
|
// Note that this dest can have no "changed bits" set,
|
|
// yet be on the list because the changes were ignored
|
|
// or because one of the entities deregistered its CN
|
|
//
|
|
|
|
// Remove bits obsoleted by any CN deregistrations
|
|
|
|
Dest->DestChangedBits &= AddrFamInfo->ChangeNotifRegns;
|
|
|
|
//
|
|
// Process all CNs whose DestChanged bit is set on dest
|
|
//
|
|
|
|
ActualChangedBits = Dest->DestChangedBits & ~Dest->DestOnQueueBits;
|
|
|
|
for (i = 0; i < AddrFamInfo->MaxChangeNotifs; i++)
|
|
{
|
|
if (!ActualChangedBits)
|
|
{
|
|
break;
|
|
}
|
|
|
|
if (IS_BIT_SET(ActualChangedBits, i))
|
|
{
|
|
Notif = AddrFamInfo->ChangeNotifsDir[i];
|
|
|
|
//
|
|
// Note that we take a lock on notify block
|
|
// only if the dest (which is locked) isn't
|
|
// already on the queue - otherwise we will
|
|
// deadlock with code in RtmGetChangedDests
|
|
//
|
|
|
|
ACQUIRE_CHANGE_NOTIFICATION_LOCK(Notif);
|
|
|
|
QueueEmpty = IsQueueEmpty(&Notif->NotifyDests);
|
|
|
|
//
|
|
// Enqueue this destination if the
|
|
// the CN's queue is not yet full
|
|
//
|
|
|
|
EnqueueItem(&Notif->NotifyDests, Dest, QueueFull);
|
|
|
|
if (!QueueFull)
|
|
{
|
|
//
|
|
// If we are adding changes to an
|
|
// empty queue, signal this event
|
|
//
|
|
|
|
if (QueueEmpty)
|
|
{
|
|
SET_BIT(NotifyChanges, i);
|
|
}
|
|
|
|
//
|
|
// Adjust dest change and queue bits
|
|
//
|
|
|
|
SET_BIT(Dest->DestOnQueueBits, i);
|
|
|
|
RESET_BIT(Dest->DestChangedBits, i);
|
|
|
|
RESET_BIT(ActualChangedBits, i);
|
|
|
|
REFERENCE_DEST(Dest, NOTIFY_REF);
|
|
}
|
|
|
|
RELEASE_CHANGE_NOTIFICATION_LOCK(Notif);
|
|
}
|
|
}
|
|
|
|
//
|
|
// Do we have any more changes to process on dest ?
|
|
//
|
|
|
|
if (ActualChangedBits == 0)
|
|
{
|
|
// Splice this dest from the changed list
|
|
Prev->Next = Curr->Next;
|
|
|
|
NumDestsRemoved++;
|
|
|
|
// "Next" == NULL means it is not on list
|
|
Curr->Next = NULL;
|
|
}
|
|
|
|
RELEASE_DEST_WRITE_LOCK(Dest);
|
|
|
|
//
|
|
// Do we have any more changes to process on dest ?
|
|
//
|
|
|
|
if (ActualChangedBits == 0)
|
|
{
|
|
DEREFERENCE_DEST(Dest, NOTIFY_REF);
|
|
}
|
|
else
|
|
{
|
|
// Advance the pointer to next dest in list
|
|
Prev = Curr;
|
|
}
|
|
|
|
Curr = Prev->Next;
|
|
|
|
if ((++NumDests == MAX_DESTS_TO_PROCESS_ONCE) ||
|
|
(Curr == ListPtr))
|
|
{
|
|
//
|
|
// Do we have any changes to inform to entities
|
|
//
|
|
|
|
for (i = 0; NotifyChanges != 0; i++)
|
|
{
|
|
if (NotifyChanges & 0x01)
|
|
{
|
|
Notif = AddrFamInfo->ChangeNotifsDir[i];
|
|
|
|
NotifyCallback = Notif->OwningEntity->EventCallback;
|
|
|
|
EntityHandle =
|
|
MAKE_HANDLE_FROM_POINTER(Notif->OwningEntity);
|
|
|
|
#if DBG_TRACE
|
|
if (TRACING_ENABLED(NOTIFY))
|
|
{
|
|
Trace1(NOTIFY, "Notifying CN %d BEGIN", i);
|
|
}
|
|
#endif
|
|
NotifyCallback(EntityHandle,
|
|
RTM_CHANGE_NOTIFICATION,
|
|
MAKE_HANDLE_FROM_POINTER(Notif),
|
|
Notif->NotifyContext);
|
|
#if DBG_TRACE
|
|
if (TRACING_ENABLED(NOTIFY))
|
|
{
|
|
Trace1(NOTIFY, "Notifying CN %d END\n", i);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
NotifyChanges >>= 1;
|
|
}
|
|
|
|
// Reset counter for number of dests processed
|
|
NumDests = 0;
|
|
}
|
|
}
|
|
|
|
if (TempList != ListPtr)
|
|
{
|
|
//
|
|
// Merge back what is left of the temp list
|
|
//
|
|
|
|
ASSERT(Prev->Next == ListPtr);
|
|
|
|
ACQUIRE_CHANGED_DESTS_LIST_LOCK(AddrFamInfo, ListNum);
|
|
|
|
if (ListPtr->Next == ListPtr)
|
|
{
|
|
AddrFamInfo->ChangeLists[ListNum].ChangedDestsTail = Prev;
|
|
}
|
|
|
|
Prev->Next = ListPtr->Next;
|
|
|
|
ListPtr->Next = TempList;
|
|
|
|
RELEASE_CHANGED_DESTS_LIST_LOCK(AddrFamInfo, ListNum);
|
|
}
|
|
|
|
InterlockedDecrement(ListInUse);
|
|
}
|
|
|
|
//
|
|
// Update number of destinations left to process on change list
|
|
//
|
|
|
|
if (NumDestsRemoved)
|
|
{
|
|
//
|
|
// Do we have any more destinations to process ?
|
|
//
|
|
|
|
ACQUIRE_NOTIF_TIMER_LOCK(AddrFamInfo);
|
|
|
|
if (InterlockedExchangeAdd(&AddrFamInfo->NumChangedDests,
|
|
(-1) * NumDestsRemoved) == NumDestsRemoved)
|
|
{
|
|
//
|
|
// Delete timer as we have no items on change list
|
|
//
|
|
|
|
ASSERT(AddrFamInfo->ChangeNotifTimer);
|
|
|
|
Success = DeleteTimerQueueTimer(AddrFamInfo->NotifTimerQueue,
|
|
AddrFamInfo->ChangeNotifTimer,
|
|
NULL);
|
|
// ASSERT(Success);
|
|
|
|
AddrFamInfo->ChangeNotifTimer = NULL;
|
|
}
|
|
|
|
RELEASE_NOTIF_TIMER_LOCK(AddrFamInfo);
|
|
}
|
|
|
|
RELEASE_NOTIFICATIONS_READ_LOCK(AddrFamInfo);
|
|
|
|
#if DBG_TRACE
|
|
if (TRACING_ENABLED(NOTIFY))
|
|
{
|
|
Trace1(NOTIFY, "Leaving ProcessChangedDestLists: %lu\n", ThreadId);
|
|
}
|
|
#endif
|
|
|
|
return;
|
|
}
|