275 lines
10 KiB
C
275 lines
10 KiB
C
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// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil -*- (for GNU Emacs)
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//
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// Copyright (c) 1985-2000 Microsoft Corporation
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//
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// This file is part of the Microsoft Research IPv6 Network Protocol Stack.
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// You should have received a copy of the Microsoft End-User License Agreement
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// for this software along with this release; see the file "license.txt".
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// If not, please see http://www.research.microsoft.com/msripv6/license.htm,
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// or write to Microsoft Research, One Microsoft Way, Redmond, WA 98052-6399.
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//
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// Abstract:
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//
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// Link-layer IPv6 interface definitions.
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//
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// This file contains the definitions defining the interface between IPv6
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// and a link layer, such as Ethernet or Token-Ring.
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//
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// Also see Packet6Context and IPv6Packet in ip6imp.h.
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//
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// NB: We implicitly assume that all link-layer addresses that a
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// particular interface will communicate with are the same length,
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// although different interfaces/links may be using addresses of
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// different lengths.
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//
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#ifndef LLIP6IF_INCLUDED
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#define LLIP6IF_INCLUDED
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#define MAX_LINK_LAYER_ADDRESS_LENGTH 64
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//
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// Structure of information passed to IPAddInterface.
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//
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// lip_defmtu must be less than or equal to lip_maxmtu.
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// lip_defmtu and lip_maxmtu do NOT include lip_hdrsize.
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//
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typedef struct LLIPBindInfo {
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void *lip_context; // LL context handle.
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uint lip_maxmtu; // Max MTU that the link can use.
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uint lip_defmtu; // Default MTU for the link.
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uint lip_flags; // Various indicators, defined in ntddip6.h.
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uint lip_type; // What kind of link - defined in ntddip6.h.
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uint lip_hdrsize; // Size of link-layer header.
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uint lip_addrlen; // Length of address in bytes - see max above.
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uchar *lip_addr; // Pointer to interface address.
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uint lip_dadxmit; // Default value for DupAddrDetectTransmits.
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uint lip_pref; // Interface preference for routing decisions.
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//
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// The following five link-layer functions should return quickly.
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// They may be called from DPC context or with spin-locks held.
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//
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//
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// Initializes the interface identifier portion of the Address
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// with the interface identifier of this interface.
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// The interface identifier may depend on state (like the ifindex)
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// that is determined during CreateInterface, so it can't
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// be passed as a parameter to CreateInterface.
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//
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void (*lip_token)(IN void *LlContext, OUT IPv6Addr *Address);
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//
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// Given a pointer to a Source/Target Link-Layer Address Option
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// (see RFC 2461), return a pointer to the link-layer address.
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// Returns NULL if the option is misformatted (eg, the length is bad).
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//
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// lip_rdllopt may be NULL if the interface does not support
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// Neighbor Discovery (IF_FLAG_NEIGHBOR_DISCOVERS).
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//
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const void *(*lip_rdllopt)(IN void *LlContext, IN const uchar *OptionData);
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//
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// Given a pointer to a Source/Target Link-Layer Address Option
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// (see RFC 2461), initializes the option data with the link-layer
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// address and zeroes any padding bytes in the option data.
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// Does not modify the option type/length bytes.
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//
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// lip_wrllopt may be NULL if the interface does not support
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// Neighbor Discovery (IF_FLAG_NEIGHBOR_DISCOVERS).
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//
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void (*lip_wrllopt)(IN void *LlContext, OUT uchar *OptionData,
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IN const void *LinkAddress);
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//
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// Statically converts an IPv6 address into a link-layer address.
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// The return value is a Neighbor Discovery state value.
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// If static conversion is not possible (a common case),
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// returns ND_STATE_INCOMPLETE to indicate the use of Neighbor Discovery.
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// If static conversion is possible (for example with multicast
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// addresses or with a p2p interface), returns (typically)
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// ND_STATE_PERMANENT or ND_STATE_STALE. ND_STATE_STALE indicates
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// that Neighbor Unreachability Detection should be performed.
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//
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ushort (*lip_cvaddr)(IN void *LlContext,
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IN const IPv6Addr *Address,
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OUT void *LinkAddress);
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//
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// Set the default router's link-layer address on an NBMA link,
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// as well as our own link-layer address to use in stateless
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// address configuration, since we may have multiple choices available.
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//
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NTSTATUS (*lip_setrtrlladdr)(IN void *LlContext,
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IN const void *TokenLinkAddress,
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IN const void *RouterLinkAddress);
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//
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// Transmits the packet to the link-layer address.
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// The Offset argument indicates the location of the IPv6 header
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// in the packet. The IPv6 layer guarantees that Offset >= lip_hdrsize,
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// leaving room for the link-layer header.
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//
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// May be called from thread or DPC context, but should not be called
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// with spin-locks held. Calls are not serialized.
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//
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void (*lip_transmit)(IN void *LlContext, IN PNDIS_PACKET Packet,
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IN uint Offset, IN const void *LinkAddress);
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//
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// Sets the multicast address list on the interface.
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// LinkAddresses is an array of link-layer addresses.
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// The first NumKeep addresses were part of the previous
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// multicast list and are to be kept. The next NumAdd
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// addresses are new additions to the multicast address list.
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// The remaining NumDel addresses should be removed
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// from the multicast address list.
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//
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// A NULL lip_mclist function is valid and indicates
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// that the interface does not support link-layer multicast.
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// For example, a point-to-point or NBMA interface.
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// If lip_mclist is non-NULL, then lip_cvaddr must be non-NULL
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// and it should return ND_STATE_PERMANENT for multicast addresses.
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//
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// Called only from thread context; may block or otherwise
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// take a long time. The IPv6 layer serializes its calls.
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// Also see RestartLinkLayerMulticast below.
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//
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NDIS_STATUS (*lip_mclist)(IN void *LlContext, IN const void *LinkAddresses,
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IN uint NumKeep, IN uint NumAdd, IN uint NumDel);
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//
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// Initiate shut down of the link-layer connection.
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// The link layer should release its reference(s) for the IPv6 interface.
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// However, the IPv6 interface is not freed until after the call
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// to lip_cleanup and the link layer can make some use of it until then.
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//
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// Called only from thread context; may block or otherwise
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// take a long time. The IPv6 layer will only call once.
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//
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void (*lip_close)(IN void *LlContext);
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//
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// Final cleanup of the link-layer connection.
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// Called by the IPv6 layer when there are no more references.
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//
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// Called only from thread context; may block or otherwise
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// take a long time. The IPv6 layer will only call once,
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// after lip_close has returned.
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//
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// Up until the call to lip_cleanup, the IPv6 layer
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// may still make calls down to the link layer.
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// In lip_cleanup, the link layer should release any references
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// that it has for lower-layer data structures and
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// free its own context structure.
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//
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void (*lip_cleanup)(IN void *LlContext);
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} LLIPBindInfo;
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//
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// These values should agree with definitions also
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// found in ip6def.h and ntddip6.h.
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//
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#define IF_TYPE_LOOPBACK 0
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#define IF_TYPE_ETHERNET 1
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#define IF_TYPE_FDDI 2
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#define IF_TYPE_TUNNEL_AUTO 3
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#define IF_TYPE_TUNNEL_6OVER4 4
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#define IF_TYPE_TUNNEL_V6V4 5
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#define IF_TYPE_TUNNEL_6TO4 6
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#define IF_TYPE_TUNNEL_TEREDO 7
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//
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// These values should agree with definitions also
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// found in ip6def.h and ntddip6.h.
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//
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#define IF_FLAG_PSEUDO 0x00000001
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#define IF_FLAG_P2P 0x00000002
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#define IF_FLAG_NEIGHBOR_DISCOVERS 0x00000004
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#define IF_FLAG_FORWARDS 0x00000008
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#define IF_FLAG_ADVERTISES 0x00000010
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#define IF_FLAG_MULTICAST 0x00000020
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#define IF_FLAG_ROUTER_DISCOVERS 0x00000040
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#define IF_FLAG_PERIODICMLD 0x00000080
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#define IF_FLAG_MEDIA_DISCONNECTED 0x00001000
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//
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// Return values for lip_cvaddr.
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// These definitions are also in ip6def.h.
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//
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#define ND_STATE_INCOMPLETE 0
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#define ND_STATE_PROBE 1
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#define ND_STATE_DELAY 2
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#define ND_STATE_STALE 3
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#define ND_STATE_REACHABLE 4
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#define ND_STATE_PERMANENT 5
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//
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// The link-layer code calls these IPv6 functions.
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// See the function definitions for explanatory comments.
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//
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extern NTSTATUS
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CreateInterface(IN const GUID *Guid, IN const LLIPBindInfo *BindInfo,
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OUT void **IpContext);
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extern void *
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AdjustPacketBuffer(IN PNDIS_PACKET Packet,
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IN uint SpaceAvail, IN uint SpaceNeeded);
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extern void
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UndoAdjustPacketBuffer(IN PNDIS_PACKET Packet);
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extern void
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IPv6ReceiveComplete(void);
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//
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// The packet itself holds a reference for the IPv6 interface,
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// so the link layer does not need to hold another reference.
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//
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extern void
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IPv6SendComplete(IN void *IpContext,
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IN PNDIS_PACKET Packet, IN IP_STATUS Status);
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//
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// The following calls must be made before lip_cleanup
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// returns. Normally they require a reference for the IPv6 interface,
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// but between lip_close and lip_cleanup the link layer may call them
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// without holding a reference for the IPv6 interface.
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//
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// NB: IPv6Receive does not take IpContext (the IPv6 interface)
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// as an explicit argument. Instead it is passed as Packet->NTEorIF.
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//
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extern int
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IPv6Receive(IN IPv6Packet *Packet);
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extern void
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SetInterfaceLinkStatus(IN void *IpContext, IN int MediaConnected);
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extern void
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DestroyInterface(IN void *IpContext);
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//
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// This function asks the IPv6 layer to call lip_mclist again,
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// adding all the link-layer multicast addresses to the interface
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// as if for the first time. In other words, with NumKeep zero.
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// The ResetDone function is called under a lock that serializes
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// the ResetDone call with lip_mclist calls on this interface.
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// Hence the link layer can know at what point in the sequence
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// of lip_mclist calls the reset took place.
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//
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extern void
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RestartLinkLayerMulticast(IN void *IpContext,
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IN void (*ResetDone)(IN void *LlContext));
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//
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// The link layer must hold a reference
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// for the IPv6 interface to make the following calls.
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//
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extern void
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ReleaseInterface(IN void *IpContext);
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#endif // LLIP6IF_INCLUDED
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