You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
437 lines
15 KiB
437 lines
15 KiB
/*++
|
|
|
|
Copyright (c) 1997 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
trie.h
|
|
|
|
Abstract:
|
|
|
|
This module contains declarations common to all
|
|
trie schemes for fast, scalable IP route lookup
|
|
|
|
Author:
|
|
|
|
Chaitanya Kodeboyina (chaitk) 26-Nov-1997
|
|
|
|
Revision History:
|
|
|
|
--*/
|
|
|
|
#ifndef TRIE_H_INCLUDED
|
|
#define TRIE_H_INCLUDED
|
|
|
|
// Dest and Route declarations
|
|
#include "iprtdef.h"
|
|
|
|
#include "misc.h"
|
|
|
|
//
|
|
// Constants
|
|
//
|
|
|
|
// Size of an IP addr
|
|
#define ADDRSIZE 32
|
|
|
|
// Max number of levels
|
|
#define MAXLEVEL 32
|
|
|
|
// Success and Error Codes
|
|
#define TRIE_SUCCESS STATUS_SUCCESS
|
|
|
|
#define ERROR_TRIE_NOT_INITED STATUS_INVALID_PARAMETER_1
|
|
#define ERROR_TRIE_RESOURCES STATUS_INSUFFICIENT_RESOURCES
|
|
#define ERROR_TRIE_BAD_PARAM STATUS_INVALID_PARAMETER
|
|
#define ERROR_TRIE_NO_ROUTES STATUS_NOT_FOUND
|
|
#define ERROR_TRIE_NOT_EMPTY STATUS_INVALID_PARAMETER_2
|
|
|
|
// Trie being accessed
|
|
#define SLOW 0x0100
|
|
#define FAST 0x0200
|
|
|
|
// Trie's Control Flags
|
|
#define TFLAG_FAST_TRIE_ENABLED 0x01
|
|
|
|
// Level of debug print
|
|
#define NONE 0x0000
|
|
#define POOL 0x0001
|
|
#define STAT 0x0002
|
|
#define SUMM 0x000F
|
|
#define TRIE 0x0080
|
|
#define FULL 0x00FF
|
|
|
|
// Control Matching Routes
|
|
#define MATCH_NONE 0x00
|
|
#define MATCH_NHOP 0x01
|
|
#define MATCH_INTF 0x02
|
|
#define MATCH_EXCLUDE_LOCAL 0x04
|
|
|
|
#define MATCH_FULL (MATCH_NHOP|MATCH_INTF)
|
|
|
|
// General Macros
|
|
|
|
#define CALLCONV __fastcall
|
|
|
|
#define TRY_BLOCK { \
|
|
UINT lastError = TRIE_SUCCESS; \
|
|
|
|
#define ERR_BLOCK CleanUp: \
|
|
|
|
#define END_BLOCK return lastError; \
|
|
} \
|
|
|
|
#define SET_ERROR(E) lastError = (E); \
|
|
|
|
#define RECOVER(E) SET_ERROR(E); \
|
|
goto CleanUp; \
|
|
|
|
#define GET_ERROR() (E) \
|
|
|
|
#define Error(S, E) { \
|
|
return( (UINT) E); \
|
|
} \
|
|
|
|
#define Recover(S, E) { \
|
|
RECOVER(E); \
|
|
} \
|
|
|
|
#define Assert(s) ASSERT(s)
|
|
|
|
#define Fatal(S, E) { \
|
|
Print("%s\n", S); \
|
|
Assert(FALSE); \
|
|
} \
|
|
|
|
// Memory Macros
|
|
#define AllocMemory0(nBytes) CTEAllocMemNBoot(nBytes, 'ZICT'); \
|
|
|
|
#define AllocMemory1(pMem, nBytes, nAvail) \
|
|
{ \
|
|
if (nBytes <= nAvail) \
|
|
pMem = CTEAllocMemNBoot(nBytes, \
|
|
'ZICT');\
|
|
else \
|
|
pMem = NULL; \
|
|
\
|
|
if (pMem == NULL) \
|
|
{ \
|
|
Recover( \
|
|
"Unable to Allocate Memory", \
|
|
(UINT)ERROR_TRIE_RESOURCES); \
|
|
} \
|
|
\
|
|
nAvail -= nBytes; \
|
|
}
|
|
|
|
#define AllocMemory2(pMem, nBytes, nAvail) \
|
|
{ \
|
|
if (nBytes <= nAvail) \
|
|
pMem = CTEAllocMem(nBytes); \
|
|
else \
|
|
pMem = NULL; \
|
|
\
|
|
if (pMem == NULL) \
|
|
{ \
|
|
Recover( \
|
|
"Unable to Allocate Memory", \
|
|
(UINT)ERROR_TRIE_RESOURCES); \
|
|
} \
|
|
\
|
|
nAvail -= nBytes; \
|
|
}
|
|
|
|
#define FreeMemory0(pMem) \
|
|
{ \
|
|
Assert(pMem != NULL); \
|
|
CTEFreeMem(pMem); \
|
|
pMem = NULL; \
|
|
} \
|
|
|
|
#define FreeMemory1(pMem, nBytes, nAvail) \
|
|
{ \
|
|
Assert(pMem != NULL); \
|
|
CTEFreeMem(pMem); \
|
|
pMem = NULL; \
|
|
nAvail += nBytes; \
|
|
} \
|
|
|
|
// Bit Macros
|
|
|
|
#define MaskBits(nb) MaskBitsArr[nb]
|
|
|
|
#define LS(ul, nb) ((ul << nb) & ((nb & ~0x1f) ? 0 : -1))
|
|
|
|
#define ShowMostSigNBits(ul, nb) (ul & ( LS(~0,(ADDRSIZE - nb)) ))
|
|
|
|
#define PickMostSigNBits(ul, nb) ((ul) >> (ADDRSIZE - nb))
|
|
|
|
#define RS(ul, nb) ((ul >> nb) & ((nb & ~0x1f) ? 0 : -1))
|
|
|
|
|
|
_inline
|
|
ULONG PickDistPosition(ULONG ul1, ULONG ul2, ULONG nbits, PULONG ul)
|
|
{
|
|
*ul = ((ul1 ^ ul2) & ~(RS(((ULONG)~0), nbits)));
|
|
return (*ul) ? ADDRSIZE - RtlGetMostSigBitSet(*ul) - 1: nbits;
|
|
}
|
|
|
|
//
|
|
// #define STRUCT_OF(type, address, field) ((type *) \
|
|
// ((PCHAR)(address) - (PCHAR)(&((type *)0)->field)))
|
|
|
|
//
|
|
// Structures
|
|
//
|
|
|
|
typedef struct _STrie STrie;
|
|
typedef struct _FTrie FTrie;
|
|
|
|
// An Trie Data Structure
|
|
|
|
typedef struct _Trie Trie;
|
|
|
|
struct _Trie
|
|
{
|
|
ULONG flags; // Trie's Control Flags
|
|
STrie *sTrie; // Slow Trie Component
|
|
FTrie *fTrie; // Fast Trie Component
|
|
};
|
|
|
|
//
|
|
// Macros
|
|
//
|
|
|
|
/*
|
|
UINT
|
|
SearchRouteInTrie (IN Trie *pTrie,
|
|
IN ULONG routeDest,
|
|
IN ULONG routeMask,
|
|
IN ULONG routeNHop,
|
|
IN PVOID routeOutIF,
|
|
IN ULONG matchFlags,
|
|
OUT Route **ppBestRoute)
|
|
/++
|
|
|
|
Routine Description:
|
|
|
|
Search for a specific route in a trie
|
|
|
|
Arguments:
|
|
|
|
pTrie - Pointer to the trie to search
|
|
routeDest - Dest of route being looked up
|
|
routeMask - Mask of route being looked up
|
|
routeNHop - NHop of route being looked up
|
|
routeOutIF - Outgoing IF for this route
|
|
matchFlags - Flags to control route matching
|
|
ppBestRoute - To return the best route match
|
|
|
|
Return Value:
|
|
|
|
TRIE_SUCCESS or ERROR_TRIE_*
|
|
|
|
--/
|
|
{
|
|
return SearchRouteInSTrie(&pTrie->sTrie, routeDest, routeMask, routeNHop,
|
|
routeOutIF, matchFlags, ppBestRoute);
|
|
}
|
|
*/
|
|
|
|
#define SearchRouteInTrie(_pTrie_, _Dest_, _Mask_, _NHop_, \
|
|
_OutIF_, _matchFlags_, _ppBestRoute_) \
|
|
SearchRouteInSTrie( (_pTrie_)->sTrie, \
|
|
_Dest_, \
|
|
_Mask_, \
|
|
_NHop_, \
|
|
_OutIF_, \
|
|
_matchFlags_, \
|
|
_ppBestRoute_) \
|
|
|
|
/*++
|
|
|
|
Dest *
|
|
SearchAddrInTrie (IN Trie *pTrie,
|
|
IN ULONG Addr)
|
|
|
|
Routine Description:
|
|
|
|
Search for an address in a trie
|
|
|
|
Arguments:
|
|
|
|
pTrie - Pointer to the trie to search
|
|
Addr - Pointer to addr being queried
|
|
|
|
Return Value:
|
|
Return best dest match for this address
|
|
|
|
--*/
|
|
|
|
#if !DBG
|
|
|
|
#define SearchAddrInTrie(_pTrie_, _Addr_) \
|
|
(((_pTrie_)->flags & TFLAG_FAST_TRIE_ENABLED) \
|
|
? SearchAddrInFTrie((_pTrie_)->fTrie, _Addr_) \
|
|
: SearchAddrInSTrie((_pTrie_)->sTrie, _Addr_)) \
|
|
|
|
#endif // !DBG
|
|
|
|
/*
|
|
VOID
|
|
IterateOverTrie (IN Trie *pTrie,
|
|
IN TrieCtxt *pContext,
|
|
OUT Route **ppNextRoute,
|
|
OUT Dest **ppNextDest OPTIONAL,
|
|
OUT UINT *status)
|
|
/++
|
|
|
|
Routine Description:
|
|
|
|
Gets a pointer to the next route in the Trie.
|
|
|
|
The first time this function is called, the
|
|
context structure should be zeroed, and not
|
|
touched thereafter until all routes are read
|
|
at which point status is set to TRIE_SUCCESS
|
|
|
|
Arguments:
|
|
|
|
pTrie - Pointer to trie to iterate over
|
|
pContext - Pointer to iterator context
|
|
ppNextRoute - To return the next trie route
|
|
ppNextDest - If specified, the routine iterates over destinations
|
|
instead of over routes.
|
|
status - Iterate Operation's return status
|
|
|
|
Return Value:
|
|
TRIE_SUCCESS or ERROR_TRIE_*
|
|
|
|
--/
|
|
{
|
|
*status =
|
|
IterateOverSTrie(&pTrie->sTrie, pContext, ppNextRoute, ppNextDest);
|
|
}
|
|
*/
|
|
|
|
#define IterateOverTrie(_pTrie_, _pContext_, _ppNextRoute_, _ppNextDest_) \
|
|
IterateOverSTrie( \
|
|
(_pTrie_)->sTrie, _pContext_, _ppNextRoute_, _ppNextDest_)
|
|
|
|
/*
|
|
INLINE
|
|
UINT
|
|
CALLCONV
|
|
IsTrieIteratorValid (IN Trie *pTrie,
|
|
IN TrieCtxt *pContext)
|
|
/++
|
|
|
|
Routine Description:
|
|
|
|
Validates an iterator context & returns status
|
|
|
|
Arguments:
|
|
|
|
pTrie - Pointer to trie to iterate over
|
|
pContext - Pointer to iterator context
|
|
|
|
Return Value:
|
|
TRIE_SUCCESS or ERROR_TRIE_*
|
|
|
|
--/
|
|
{
|
|
return IsSTrieIteratorValid(&pTrie->sTrie, pContext);
|
|
}
|
|
*/
|
|
|
|
#define IsTrieIteratorValid(_pTrie_, _pContext_) \
|
|
IsSTrieIteratorValid( (_pTrie_)->sTrie, _pContext_)
|
|
|
|
|
|
/*
|
|
VOID
|
|
FreeRouteInTrie (IN Trie *pTrie,
|
|
IN Route *pRoute)
|
|
/++
|
|
Routine Description:
|
|
|
|
Frees memory for a route
|
|
|
|
Arguments:
|
|
|
|
IN -
|
|
pTrie - Pointer to trie that owns the route
|
|
Route - The Route to be freed
|
|
|
|
Return Value:
|
|
|
|
None
|
|
|
|
--/
|
|
{
|
|
FreeRouteInSTrie(&pTrie->sTrie, pRoute);
|
|
}
|
|
*/
|
|
|
|
#define FreeRouteInTrie(_pTrie_, _pRoute_) FreeRouteInSTrie( (_pTrie_)->sTrie, _pRoute_)
|
|
|
|
// Wrapper Functions
|
|
|
|
UINT
|
|
CreateTrie (IN ULONG levels,
|
|
IN ULONG flags,
|
|
IN ULONG maxSTMemory,
|
|
IN ULONG maxFTMemory,
|
|
OUT Trie **pTrie);
|
|
|
|
VOID
|
|
DestroyTrie (IN Trie *pTrie,
|
|
OUT UINT *status);
|
|
|
|
UINT
|
|
CALLCONV
|
|
InsertIntoTrie (IN Trie *pTrie,
|
|
IN Route *pIncRoute,
|
|
IN ULONG matchFlags,
|
|
OUT Route **ppInsRoute,
|
|
OUT Route **ppOldBestRoute,
|
|
OUT Route **ppNewBestRoute);
|
|
|
|
UINT
|
|
CALLCONV
|
|
DeleteFromTrie (IN Trie *pTrie,
|
|
IN Route *pIncRoute,
|
|
IN ULONG matchFlags,
|
|
OUT Route **ppDelRoute,
|
|
OUT Route **ppOldBestRoute,
|
|
OUT Route **ppNewBestRoute);
|
|
|
|
#if DBG
|
|
|
|
Dest *
|
|
SearchAddrInTrie (IN Trie *pTrie,
|
|
IN ULONG Addr);
|
|
|
|
VOID
|
|
PrintTrie (IN Trie *pTrie,
|
|
IN UINT flags);
|
|
|
|
VOID
|
|
PrintRoute (IN Route *route);
|
|
|
|
VOID
|
|
PrintDest (IN Dest *dest);
|
|
|
|
VOID
|
|
PrintIPAddr (IN ULONG *addr);
|
|
|
|
#endif
|
|
|
|
//
|
|
// Extern Variables
|
|
//
|
|
|
|
extern const ULONG MaskBitsArr[];
|
|
|
|
#endif // TRIE_H_INCLUDED
|
|
|