135 lines
3 KiB
C
135 lines
3 KiB
C
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/*++
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Copyright (c) 1997 Microsoft Corporation
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Module Name:
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icmp.h
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Abstract:
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Contains declarations for the NAT's ICMP-message manipulation.
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Author:
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Abolade Gbadegesin (t-abolag) 30-July-1997
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Revision History:
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--*/
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#ifndef _NAT_ICMP_H_
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#define _NAT_ICMP_H_
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//
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// Structure: NAT_ICMP_MAPPING
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//
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// This structure stores a mapping created for an ICMP-request message.
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//
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// In order to allow ICMP requests to be associated with replies,
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// we translate the 'Identification' field, which operates in a manner
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// similar to the TCP/UDP port field; the 'Identification' field is the same
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// for a 'session' (e.g. a series of echo-request messages).
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//
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// This means that when an internal machine 'pings' an external machine,
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// we choose a unique 'PublicId' for the 'session' from the point of view
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// of the external machine. Likewise, when an external machine 'pings'
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// an internal machine, we choose a unique 'PrivateId' for the session.
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//
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// Hence, on the outbound path we identify ICMP messages using the tuple
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//
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// <RemoteAddress # PrivateAddress, PrivateId>
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//
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// and on the inbound path we identify using the tuple
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//
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// <RemoteAddress # PublicAddress, PublicId>
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//
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// and these tuples are the composite search keys for the outbound and inbound
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// list of mappings, respectively, for each interface.
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//
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typedef struct _NAT_ICMP_MAPPING {
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LIST_ENTRY Link[NatMaximumDirection];
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ULONG64 PrivateKey;
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ULONG64 PublicKey;
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USHORT PrivateId;
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USHORT PublicId;
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LONG64 LastAccessTime;
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} NAT_ICMP_MAPPING, *PNAT_ICMP_MAPPING;
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//
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// ICMP mapping-key manipulation macros
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//
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#define MAKE_ICMP_KEY(RemoteAddress,OtherAddress) \
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((ULONG)(RemoteAddress) | ((ULONG64)((ULONG)(OtherAddress)) << 32))
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#define ICMP_KEY_REMOTE(Key) ((ULONG)(Key))
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#define ICMP_KEY_PRIVATE(Key) ((ULONG)((Key) >> 32))
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#define ICMP_KEY_PUBLIC(Key) ((ULONG)((Key) >> 32))
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//
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// ICMP mapping allocation macros
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//
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#define ALLOCATE_ICMP_BLOCK() \
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ExAllocateFromNPagedLookasideList(&IcmpLookasideList)
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#define FREE_ICMP_BLOCK(Block) \
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ExFreeToNPagedLookasideList(&IcmpLookasideList,(Block))
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extern NPAGED_LOOKASIDE_LIST IcmpLookasideList;
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extern LIST_ENTRY IcmpMappingList[NatMaximumDirection];
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extern KSPIN_LOCK IcmpMappingLock;
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//
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// ICMP MAPPING MANAGEMENT ROUTINES
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//
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NTSTATUS
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NatCreateIcmpMapping(
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PNAT_INTERFACE Interfacep,
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ULONG RemoteAddress,
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ULONG PrivateAddress,
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ULONG PublicAddress,
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PUSHORT PrivateId,
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PUSHORT PublicId,
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PLIST_ENTRY InboundInsertionPoint,
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PLIST_ENTRY OutboundInsertionPoint,
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PNAT_ICMP_MAPPING* MappingCreated
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);
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VOID
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NatInitializeIcmpManagement(
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VOID
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);
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PNAT_ICMP_MAPPING
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NatLookupInboundIcmpMapping(
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ULONG64 PublicKey,
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USHORT PublicId,
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PLIST_ENTRY* InsertionPoint
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);
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PNAT_ICMP_MAPPING
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NatLookupOutboundIcmpMapping(
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ULONG64 PrivateKey,
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USHORT PrivateId,
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PLIST_ENTRY* InsertionPoint
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);
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VOID
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NatShutdownIcmpManagement(
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VOID
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);
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XLATE_IP_ROUTINE(NatTranslateIcmp)
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#endif // _NAT_ICMP_H_
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