108 lines
1.9 KiB
C
108 lines
1.9 KiB
C
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/*++
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Copyright (c) 1997-2001 Microsoft Corporation
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Module Name:
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NsIcmp.h
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Abstract:
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Declarations for IpSec NAT shim ICMP management
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Author:
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Jonathan Burstein (jonburs) 11-July-2001
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Environment:
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Kernel mode
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Revision History:
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--*/
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#pragma once
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//
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// Structure: NS_ICMP_ENTRY
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//
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// This structure stores the information needed to process ICMP
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// request-response messages. An entry will be created for an
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// inbound request message.
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//
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// If necessary the ICMP logic will translate the ICMP identifier
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// to avoid conflicts.
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//
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// The timer routine removes entries from the ICMP list when they
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// have surpassed the inactivity threshold.
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//
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// All access to the ICMP list or entires must happen while holding
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// the ICMP list lock.
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//
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typedef struct _NS_ICMP_ENTRY
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{
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LIST_ENTRY Link;
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LONG64 l64LastAccessTime;
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ULONG64 ul64AddressKey;
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USHORT usOriginalId;
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USHORT usTranslatedId;
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PVOID pvIpSecContext;
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} NS_ICMP_ENTRY, *PNS_ICMP_ENTRY;
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//
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// Defines the depth of the lookaside list for allocating ICMP entries
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//
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#define NS_ICMP_LOOKASIDE_DEPTH 10
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//
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// Global Variables
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//
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extern LIST_ENTRY NsIcmpList;
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extern KSPIN_LOCK NsIcmpLock;
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extern NPAGED_LOOKASIDE_LIST NsIcmpLookasideList;
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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(&NsIcmpLookasideList)
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#define FREE_ICMP_BLOCK(Block) \
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ExFreeToNPagedLookasideList(&NsIcmpLookasideList,(Block))
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//
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// Function Prototypes
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//
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NTSTATUS
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NsInitializeIcmpManagement(
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VOID
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);
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NTSTATUS
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FASTCALL
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NsProcessIncomingIcmpPacket(
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PNS_PACKET_CONTEXT pContext,
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PVOID pvIpSecContext
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);
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NTSTATUS
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FASTCALL
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NsProcessOutgoingIcmpPacket(
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PNS_PACKET_CONTEXT pContext,
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PVOID *ppvIpSecContext
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);
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VOID
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NsShutdownIcmpManagement(
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VOID
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);
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