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556 lines
14 KiB
556 lines
14 KiB
/*++
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Copyright (c) 1997 - 98, Microsoft Corporation
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Module Name:
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rtmquer.c
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Abstract:
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Contains routines for querying the
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best route information in RTM.
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Author:
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Chaitanya Kodeboyina (chaitk) 24-Aug-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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RtmGetExactMatchDestination (
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IN RTM_ENTITY_HANDLE RtmRegHandle,
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IN PRTM_NET_ADDRESS DestAddress,
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IN ULONG ProtocolId,
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IN RTM_VIEW_SET TargetViews,
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OUT PRTM_DEST_INFO DestInfo
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)
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/*++
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Routine Description:
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Queries the route table for a destination with a particular
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network address.
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Arguments:
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RtmRegHandle - RTM registration handle for calling entity,
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DestAddress - Network Address of the destination we want,
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Protocol Id - Protocol Id that determines the best route
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information returned in 'DestInfo' param,
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TargetViews - Views in which the query is executed (a '0'
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val will eliminate view membership checks),
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DestInfo - Information related to this dest is returned
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in this structure for all the views requested.
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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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PDEST_INFO Dest;
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PLOOKUP_LINKAGE DestData;
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DWORD Status;
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//
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// Validate the input parameters before the search
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//
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VALIDATE_ENTITY_HANDLE(RtmRegHandle, &Entity);
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AddrFamInfo = Entity->OwningAddrFamily;
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ACQUIRE_ROUTE_TABLE_READ_LOCK(AddrFamInfo);
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//
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// Search route table using the dest address
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//
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Status = SearchInTable(AddrFamInfo->RouteTable,
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DestAddress->NumBits,
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DestAddress->AddrBits,
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NULL,
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&DestData);
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if (SUCCESS(Status))
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{
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Dest = CONTAINING_RECORD(DestData, DEST_INFO, LookupLinkage);
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//
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// Check if the destination is in any of the input views
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//
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if ((TargetViews == RTM_VIEW_MASK_ANY) ||
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(Dest->BelongsToViews & TargetViews))
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{
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//
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// Get the destination info from the dest
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//
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GetDestInfo(Entity, Dest, ProtocolId, TargetViews, DestInfo);
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Status = NO_ERROR;
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}
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else
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{
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Status = ERROR_NOT_FOUND;
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}
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}
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RELEASE_ROUTE_TABLE_READ_LOCK(AddrFamInfo);
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return Status;
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}
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DWORD
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WINAPI
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RtmGetMostSpecificDestination (
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IN RTM_ENTITY_HANDLE RtmRegHandle,
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IN PRTM_NET_ADDRESS DestAddress,
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IN ULONG ProtocolId,
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IN RTM_VIEW_SET TargetViews,
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OUT PRTM_DEST_INFO DestInfo
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)
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/*++
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Routine Description:
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Queries the route table for a destination with the best
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(longest) match of a particular network address.
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Arguments:
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RtmRegHandle - RTM registration handle for calling entity,
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DestAddress - Network Address that we are searching for,
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Protocol Id - Protocol Id that determines the best route
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information returned in 'DestInfo' param,
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TargetViews - Views in which the query is executed (a '0'
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val will eliminate view membership checks),
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DestInfo - Information related to this dest is returned
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in this structure for all the views requested.
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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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PDEST_INFO Dest;
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PLOOKUP_LINKAGE DestData;
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DWORD Status;
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//
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// Validate the input parameters before the search
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//
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VALIDATE_ENTITY_HANDLE(RtmRegHandle, &Entity);
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AddrFamInfo = Entity->OwningAddrFamily;
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Status = ERROR_NOT_FOUND;
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ACQUIRE_ROUTE_TABLE_READ_LOCK(AddrFamInfo);
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//
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// Search the table for the best match in tree
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//
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SearchInTable(AddrFamInfo->RouteTable,
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DestAddress->NumBits,
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DestAddress->AddrBits,
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NULL,
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&DestData);
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while (DestData)
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{
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Dest = CONTAINING_RECORD(DestData, DEST_INFO, LookupLinkage);
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//
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// Check if the destination is in any of the input views
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//
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if ((TargetViews == RTM_VIEW_MASK_ANY) ||
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(Dest->BelongsToViews & TargetViews))
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{
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//
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// Get the destination info from the dest
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//
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GetDestInfo(Entity, Dest, ProtocolId, TargetViews, DestInfo);
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Status = NO_ERROR;
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break;
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}
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//
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// Get the next best prefix, and see if it is in view
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//
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NextMatchInTable(AddrFamInfo->RouteTable,
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DestData,
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&DestData);
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}
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RELEASE_ROUTE_TABLE_READ_LOCK(AddrFamInfo);
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return Status;
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}
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DWORD
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WINAPI
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RtmGetLessSpecificDestination (
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IN RTM_ENTITY_HANDLE RtmRegHandle,
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IN RTM_DEST_HANDLE DestHandle,
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IN ULONG ProtocolId,
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IN RTM_VIEW_SET TargetViews,
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OUT PRTM_DEST_INFO DestInfo
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)
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/*++
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Routine Description:
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Queries the route table for a destination with the next best
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match (longest) prefix. (for a destination given by handle).
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Arguments:
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RtmRegHandle - RTM registration handle for calling entity,
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DestHandle - Destination whose next best match we want,
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Protocol Id - Protocol Id that determines the best route
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information returned in 'DestInfo' param,
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TargetViews - Views in which the query is executed (a '0'
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val will eliminate view membership checks),
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DestInfo - Information related to this dest is returned
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in this structure for all the views requested.
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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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PDEST_INFO Dest;
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PLOOKUP_LINKAGE DestData;
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DWORD Status;
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//
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// Validate the input parameters before the search
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//
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VALIDATE_ENTITY_HANDLE(RtmRegHandle, &Entity);
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AddrFamInfo = Entity->OwningAddrFamily;
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VALIDATE_DEST_HANDLE(DestHandle, &Dest);
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DestData = &Dest->LookupLinkage;
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Status = ERROR_NOT_FOUND;
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ACQUIRE_ROUTE_TABLE_READ_LOCK(AddrFamInfo);
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//
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// Go up the prefix tree till you have a dest in views
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//
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do
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{
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//
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// Get the next best prefix, and see if it is in views
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//
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NextMatchInTable(AddrFamInfo->RouteTable,
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DestData,
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&DestData);
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if (DestData == NULL)
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{
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break;
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}
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Dest = CONTAINING_RECORD(DestData, DEST_INFO, LookupLinkage);
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//
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// Check if the destination is in any of the input views
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//
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if ((TargetViews == RTM_VIEW_MASK_ANY) ||
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(Dest->BelongsToViews & TargetViews))
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{
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//
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// Get the destination info from the dest
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//
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GetDestInfo(Entity, Dest, ProtocolId, TargetViews, DestInfo);
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Status = NO_ERROR;
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break;
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}
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}
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while (TRUE);
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RELEASE_ROUTE_TABLE_READ_LOCK(AddrFamInfo);
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return Status;
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}
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DWORD
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WINAPI
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RtmGetExactMatchRoute (
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IN RTM_ENTITY_HANDLE RtmRegHandle,
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IN PRTM_NET_ADDRESS DestAddress,
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IN RTM_MATCH_FLAGS MatchingFlags,
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IN OUT PRTM_ROUTE_INFO RouteInfo,
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IN ULONG InterfaceIndex,
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IN RTM_VIEW_SET TargetViews,
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OUT PRTM_ROUTE_HANDLE RouteHandle
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)
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/*++
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Routine Description:
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Queries the route table for a route that matches certain
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criteria - a network address, preference and/or nexthop.
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Arguments:
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RtmRegHandle - RTM registration handle for calling entity,
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DestAddress - Network Address of the route we want,
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MatchingFlags - Flags that tell how to match a route,
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RouteInfo - Criteria that we need to match against,
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IntefaceIndex - Interface on which route should be present
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in case RTM_MATCH_INTERFACE is specified,
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TargetViews - Views in which the query is executed (a '0'
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val will eliminate view membership checks),
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RouteHandle - Route handle (if an exact match exists),
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RouteInfo - Information related to this route 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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PDEST_INFO Dest;
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PROUTE_INFO Route;
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PLOOKUP_LINKAGE DestData;
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PLIST_ENTRY p;
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DWORD Status;
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//
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// Validate the input parameters before the search
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//
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VALIDATE_ENTITY_HANDLE(RtmRegHandle, &Entity);
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AddrFamInfo = Entity->OwningAddrFamily;
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ACQUIRE_ROUTE_TABLE_READ_LOCK(AddrFamInfo);
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//
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// Search route table using the dest address
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//
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Status = SearchInTable(AddrFamInfo->RouteTable,
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DestAddress->NumBits,
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DestAddress->AddrBits,
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NULL,
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&DestData);
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if (SUCCESS(Status))
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{
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Dest = CONTAINING_RECORD(DestData, DEST_INFO, LookupLinkage);
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Status = ERROR_NOT_FOUND;
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//
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// Check if the destination matches any input views
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//
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if ((TargetViews == RTM_VIEW_MASK_ANY) ||
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(Dest->BelongsToViews & TargetViews))
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{
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#if DBG
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REFERENCE_DEST(Dest, TEMP_USE_REF);
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#endif
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//
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// At this point, we have the dest. So take the
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// dest lock, and release the route table lock.
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//
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ACQUIRE_DEST_READ_LOCK(Dest);
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RELEASE_ROUTE_TABLE_READ_LOCK(AddrFamInfo);
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//
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// Search routes on dest for a matching route
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//
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for (p = Dest->RouteList.Flink; p != &Dest->RouteList; p= p->Flink)
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{
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Route = CONTAINING_RECORD(p, ROUTE_INFO, DestLE);
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// Check if this route matches any input views
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if ((TargetViews != RTM_VIEW_MASK_ANY) &&
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(Route->RouteInfo.BelongsToViews & TargetViews) == 0)
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{
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continue;
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}
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// Check if this route matches input criteria
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if (MatchingFlags &&
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!MatchRouteWithCriteria(Route,
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MatchingFlags,
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RouteInfo,
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InterfaceIndex))
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{
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continue;
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}
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//
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// Found a matching route - copy the route info
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//
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REFERENCE_ROUTE(Route, HANDLE_REF);
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*RouteHandle = MAKE_HANDLE_FROM_POINTER(Route);
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if (ARGUMENT_PRESENT(RouteInfo))
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{
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GetRouteInfo(Dest, Route, RouteInfo);
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}
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Status = NO_ERROR;
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break;
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}
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RELEASE_DEST_READ_LOCK(Dest);
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#if DBG
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DEREFERENCE_DEST(Dest, TEMP_USE_REF);
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#endif
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return Status;
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}
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}
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RELEASE_ROUTE_TABLE_READ_LOCK(AddrFamInfo);
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return Status;
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}
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DWORD
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WINAPI
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RtmIsBestRoute (
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IN RTM_ENTITY_HANDLE RtmRegHandle,
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IN RTM_ROUTE_HANDLE RouteHandle,
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OUT PRTM_VIEW_SET BestInViews
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)
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/*++
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Routine Description:
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Gives the set of views in which the route is the best route
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to its destination.
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Arguments:
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RtmRegHandle - RTM registration handle for calling entity,
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RouteHandle - Handle to the route whose info we want,
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BestInViews - Views that route is the best one in 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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PENTITY_INFO Entity;
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PDEST_INFO Dest;
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PROUTE_INFO Route;
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UINT i;
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*BestInViews = 0;
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VALIDATE_ENTITY_HANDLE(RtmRegHandle, &Entity);
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VALIDATE_ROUTE_HANDLE(RouteHandle, &Route);
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Dest = DEST_FROM_HANDLE(Route->RouteInfo.DestHandle);
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//
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// Set the bit in mask if the route is the best in the corr view
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//
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ACQUIRE_DEST_READ_LOCK(Dest);
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for (i = 0; i < Entity->OwningAddrFamily->NumberOfViews; i++)
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{
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if (Dest->ViewInfo[i].BestRoute == Route)
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{
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*BestInViews |=
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VIEW_MASK(Entity->OwningAddrFamily->ViewIdFromIndex[i]);
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}
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}
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RELEASE_DEST_READ_LOCK(Dest);
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return NO_ERROR;
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}
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