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.
267 lines
6.4 KiB
267 lines
6.4 KiB
/*++
|
|
|
|
Copyright (c) 1997, Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
pptp.h
|
|
|
|
Abstract:
|
|
|
|
This module contains declarations for the NAT's PPTP-support routines.
|
|
|
|
Author:
|
|
|
|
Abolade Gbadegesin (t-abolag) 18-Aug-1997
|
|
|
|
Revision History:
|
|
|
|
--*/
|
|
|
|
|
|
#ifndef _NAT_PPTP_H_
|
|
#define _NAT_PPTP_H_
|
|
|
|
//
|
|
// Structure: NAT_PPTP_MAPPING
|
|
//
|
|
// This structure stores a mapping created for a PPTP tunnel.
|
|
//
|
|
// Any PPTP tunnel is uniquely identified by the quadruple
|
|
//
|
|
// <PrivateAddress, RemoteAddress, PrivateCallID, RemoteCallID>
|
|
//
|
|
// We need to ensure that the 'PrivateCallID's are unique for all the machines
|
|
// behind the NAT.
|
|
//
|
|
// Hence, the NAT watches all PPTP control sessions (TCP port 1723), and for
|
|
// any PPTP call detected, allocates a call ID to replace the ID chosen by
|
|
// the private-network PPTP endpoint.
|
|
//
|
|
// The allocation is recorded by creating an entry in a list of PPTP mappings,
|
|
// which is sorted for outbound-tunnel-message searching on
|
|
//
|
|
// <RemoteAddress # PrivateAddress, RemoteCallId>
|
|
//
|
|
// and sorted for inbound-tunnel-message searching on
|
|
//
|
|
// <RemoteAddress # PublicAddress, PublicCallId>.
|
|
//
|
|
// When a mapping is first created, it is marked half-open and is inserted
|
|
// only in the inbound-list, since no remote-call-ID is available to serve
|
|
// as the secondary key in the outbound list. Later, when the call-reply
|
|
// is received, the mapping is also placed on the outbound list.
|
|
//
|
|
// Access to the list of PPTP mappings is granted by 'PptpMappingLock'.
|
|
//
|
|
// N.B. On the rare occasions when 'MappingLock' must be held at the same time
|
|
// as one of 'InterfaceLock', 'EditorLock', and 'DirectorLock', 'MappingLock'
|
|
// must always be acquired first.
|
|
//
|
|
|
|
typedef struct _NAT_PPTP_MAPPING {
|
|
LIST_ENTRY Link[NatMaximumDirection];
|
|
ULONG64 PrivateKey;
|
|
ULONG64 PublicKey;
|
|
ULONG64 PortKey;
|
|
USHORT PrivateCallId;
|
|
USHORT PublicCallId;
|
|
USHORT RemoteCallId;
|
|
ULONG Flags;
|
|
LONG64 LastAccessTime;
|
|
} NAT_PPTP_MAPPING, *PNAT_PPTP_MAPPING;
|
|
|
|
//
|
|
// PPTP mapping flags
|
|
//
|
|
|
|
#define NAT_PPTP_FLAG_HALF_OPEN 0x00000001
|
|
#define NAT_PPTP_FLAG_DISCONNECTED 0x00000002
|
|
|
|
#define NAT_PPTP_HALF_OPEN(m) \
|
|
((m)->Flags & NAT_PPTP_FLAG_HALF_OPEN)
|
|
|
|
#define NAT_PPTP_DISCONNECTED(m) \
|
|
((m)->Flags & NAT_PPTP_FLAG_DISCONNECTED)
|
|
|
|
//
|
|
// PPTP key-manipulation macros
|
|
//
|
|
|
|
#define MAKE_PPTP_KEY(RemoteAddress,OtherAddress) \
|
|
((ULONG)(RemoteAddress) | ((ULONG64)((ULONG)(OtherAddress)) << 32))
|
|
|
|
#define PPTP_KEY_REMOTE(Key) ((ULONG)(Key))
|
|
#define PPTP_KEY_PRIVATE(Key) ((ULONG)((Key) >> 32))
|
|
#define PPTP_KEY_PUBLIC(Key) ((ULONG)((Key) >> 32))
|
|
|
|
#define MAKE_PPTP_PORT_KEY(PrivatePort,PublicPort,RemotePort) \
|
|
((PrivatePort) | \
|
|
((ULONG64)((PublicPort) & 0xFFFF) << 16) | \
|
|
((ULONG64)((RemotePort) & 0xFFFF) << 32))
|
|
|
|
#define PPTP_PORT_KEY_REMOTE(Key) ((USHORT)(((Key) >> 32) & 0xFFFF))
|
|
#define PPTP_PORT_KEY_PUBLIC(Key) ((USHORT)(((Key) >> 16) & 0xFFFF))
|
|
#define PPTP_PORT_KEY_PRIVATE(Key) ((USHORT)(Key))
|
|
|
|
//
|
|
// PPTP mapping allocation macros
|
|
//
|
|
|
|
#define ALLOCATE_PPTP_BLOCK() \
|
|
ExAllocateFromNPagedLookasideList(&PptpLookasideList)
|
|
|
|
#define FREE_PPTP_BLOCK(Block) \
|
|
ExFreeToNPagedLookasideList(&PptpLookasideList,(Block))
|
|
|
|
//
|
|
// Define the depth of the lookaside list for allocating PPTP mappings
|
|
//
|
|
|
|
#define PPTP_LOOKASIDE_DEPTH 10
|
|
|
|
|
|
//
|
|
// Global data declarations
|
|
//
|
|
|
|
extern NPAGED_LOOKASIDE_LIST PptpLookasideList;
|
|
extern LIST_ENTRY PptpMappingList[NatMaximumDirection];
|
|
extern KSPIN_LOCK PptpMappingLock;
|
|
extern IP_NAT_REGISTER_EDITOR PptpRegisterEditorClient;
|
|
extern IP_NAT_REGISTER_EDITOR PptpRegisterEditorServer;
|
|
|
|
|
|
//
|
|
// PPTP mapping management routines
|
|
//
|
|
|
|
NTSTATUS
|
|
NatAllocatePublicPptpCallId(
|
|
ULONG64 PublicKey,
|
|
PUSHORT CallIdp,
|
|
PLIST_ENTRY *InsertionPoint OPTIONAL
|
|
);
|
|
|
|
NTSTATUS
|
|
NatCreatePptpMapping(
|
|
ULONG RemoteAddress,
|
|
ULONG PrivateAddress,
|
|
USHORT PrivateCallId,
|
|
ULONG PublicAddress,
|
|
PUSHORT CallIdp,
|
|
IP_NAT_DIRECTION Direction,
|
|
USHORT PrivatePort,
|
|
USHORT PublicPort,
|
|
USHORT RemotePort,
|
|
PNAT_PPTP_MAPPING* MappingCreated
|
|
);
|
|
|
|
NTSTATUS
|
|
NatInitializePptpManagement(
|
|
VOID
|
|
);
|
|
|
|
PNAT_PPTP_MAPPING
|
|
NatLookupInboundPptpMapping(
|
|
ULONG64 PublicKey,
|
|
USHORT PrivateCallId,
|
|
PLIST_ENTRY* InsertionPoint
|
|
);
|
|
|
|
PNAT_PPTP_MAPPING
|
|
NatLookupOutboundPptpMapping(
|
|
ULONG64 PrivateKey,
|
|
USHORT RemoteCallId,
|
|
PLIST_ENTRY* InsertionPoint
|
|
);
|
|
|
|
VOID
|
|
NatShutdownPptpManagement(
|
|
VOID
|
|
);
|
|
|
|
|
|
//
|
|
// PPTP control-connection editor routines
|
|
//
|
|
|
|
NTSTATUS
|
|
NatClientToServerDataHandlerPptp(
|
|
IN PVOID InterfaceHandle,
|
|
IN PVOID SessionHandle,
|
|
IN PVOID DataHandle,
|
|
IN PVOID EditorContext,
|
|
IN PVOID EditorSessionContext,
|
|
IN PVOID ReceiveBuffer,
|
|
IN ULONG DataOffset,
|
|
IN IP_NAT_DIRECTION Direction
|
|
);
|
|
|
|
NTSTATUS
|
|
NatDeleteHandlerPptp(
|
|
IN PVOID InterfaceHandle,
|
|
IN PVOID SessionHandle,
|
|
IN PVOID EditorContext,
|
|
IN PVOID EditorSessionContext
|
|
);
|
|
|
|
NTSTATUS
|
|
NatInboundDataHandlerPptpClient(
|
|
IN PVOID InterfaceHandle,
|
|
IN PVOID SessionHandle,
|
|
IN PVOID DataHandle,
|
|
IN PVOID EditorContext,
|
|
IN PVOID EditorSessionContext,
|
|
IN PVOID RecvBuffer,
|
|
IN ULONG DataOffset
|
|
);
|
|
|
|
NTSTATUS
|
|
NatInboundDataHandlerPptpServer(
|
|
IN PVOID InterfaceHandle,
|
|
IN PVOID SessionHandle,
|
|
IN PVOID DataHandle,
|
|
IN PVOID EditorContext,
|
|
IN PVOID EditorSessionContext,
|
|
IN PVOID RecvBuffer,
|
|
IN ULONG DataOffset
|
|
);
|
|
|
|
NTSTATUS
|
|
NatOutboundDataHandlerPptpClient(
|
|
IN PVOID InterfaceHandle,
|
|
IN PVOID SessionHandle,
|
|
IN PVOID DataHandle,
|
|
IN PVOID EditorContext,
|
|
IN PVOID EditorSessionContext,
|
|
IN PVOID RecvBuffer,
|
|
IN ULONG DataOffset
|
|
);
|
|
|
|
NTSTATUS
|
|
NatOutboundDataHandlerPptpServer(
|
|
IN PVOID InterfaceHandle,
|
|
IN PVOID SessionHandle,
|
|
IN PVOID DataHandle,
|
|
IN PVOID EditorContext,
|
|
IN PVOID EditorSessionContext,
|
|
IN PVOID RecvBuffer,
|
|
IN ULONG DataOffset
|
|
);
|
|
|
|
NTSTATUS
|
|
NatServerToClientDataHandlerPptp(
|
|
IN PVOID InterfaceHandle,
|
|
IN PVOID SessionHandle,
|
|
IN PVOID DataHandle,
|
|
IN PVOID EditorContext,
|
|
IN PVOID EditorSessionContext,
|
|
IN PVOID ReceiveBuffer,
|
|
IN ULONG DataOffset,
|
|
IN IP_NAT_DIRECTION Direction
|
|
);
|
|
|
|
XLATE_IP_ROUTINE(NatTranslatePptp)
|
|
|
|
#endif // _NAT_PPTP_H_
|