281 lines
9.2 KiB
C
281 lines
9.2 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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// Implementation specific definitions for Internet Protocol Version 6.
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//
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// Things we want visible to other kernel modules, yet aren't part of the
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// official specifications (i.e. are implementation specific) go here.
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//
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#ifndef IP6IMP_INCLUDED
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#define IP6IMP_INCLUDED 1
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//
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// These first few definitions (before the include of ip6.h)
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// replicate definitions from winsock2.h and ws2tcpip.h.
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// Unfortunately, those header files are not usable in the kernel.
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//
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typedef unsigned char u_char;
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typedef unsigned short u_short;
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typedef unsigned int u_int;
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typedef unsigned long u_long;
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typedef unsigned __int64 u_int64;
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/* Argument structure for IPV6_JOIN_GROUP and IPV6_LEAVE_GROUP */
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#include <ipexport.h>
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typedef struct ipv6_mreq {
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struct in6_addr ipv6mr_multiaddr; /* IPv6 multicast address */
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unsigned int ipv6mr_interface; /* Interface index */
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} IPV6_MREQ;
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#include <ip6.h>
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//
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// The actual definitions can be found in ip6def.h.
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//
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typedef struct NetTableEntryOrInterface NetTableEntryOrInterface;
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typedef struct Interface Interface;
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//
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// The actual definition of a Security Association Linkage
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// can be found in security.h.
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//
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typedef struct SALinkage SALinkage;
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typedef struct IPv6Packet IPv6Packet;
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typedef struct IPv6PacketAuxiliary IPv6PacketAuxiliary;
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//
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// Structure of packet data we pass around the stack.
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// Exactly one of FlatData and NdisPacket should be non-NULL.
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//
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struct IPv6Packet {
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IPv6Packet *Next; // Next entry on a list of packets.
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uint Position; // Current logical offset into packet.
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void *Data; // Current pointer into packet data.
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uint ContigSize; // Amount of contiguous data remaining.
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uint TotalSize; // Total amount of data remaining.
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NetTableEntryOrInterface *NTEorIF; // NTE or IF we received packet on.
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void *FlatData; // Original flat data pointer (if any).
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PNDIS_PACKET NdisPacket; // Original NDIS Packet (if any).
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long RefCnt; // References held to NdisPacket.
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IPv6PacketAuxiliary *AuxList; // Extra memory allocated by our stack.
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uint Flags; // Various, see below.
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IPv6Header UNALIGNED *IP; // IP header for this packet.
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uint IPPosition; // Offset at which IP header resides.
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IPv6Addr *SrcAddr; // Source/home addr for mobile IP.
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SALinkage *SAPerformed; // Security Associations performed.
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uint NextHeaderPosition; // Offset of recent NextHeader field.
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uint SkippedHeaderLength; // Headers skipped in AH validation.
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};
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// Flags for above.
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#define PACKET_OURS 0x01 // We alloc'd IPv6Packet struct off heap.
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#define PACKET_NOT_LINK_UNICAST 0x02 // Link-level broadcast or multicast.
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#define PACKET_REASSEMBLED 0x04 // Arrived as a bunch of fragments.
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#define PACKET_HOLDS_REF 0x08 // Packet holds an NTE or IF reference.
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#define PACKET_JUMBO_OPTION 0x10 // Packet has a jumbo payload option.
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#define PACKET_ICMP_ERROR 0x20 // Packet is an ICMP error message.
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#define PACKET_SAW_HA_OPT 0x40 // Home Addr Opt modified current IP hdr.
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#define PACKET_TUNNELED 0x80 // Arrived inside an outer IPv6 header.
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#define PACKET_LOOPED_BACK 0x100 // Arrived via internal loopback.
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//
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// Flags that are inherited by a reassembled datagram from its fragments.
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//
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#define PACKET_INHERITED_FLAGS (PACKET_NOT_LINK_UNICAST | \
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PACKET_TUNNELED | \
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PACKET_LOOPED_BACK)
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struct IPv6PacketAuxiliary {
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IPv6PacketAuxiliary *Next; // Next entry on packet's aux list.
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uint Position; // Packet position corresponding to region.
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uint Length; // Length of region in bytes.
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uchar *Data; // Data comprising region.
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};
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//
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// PacketPullup will sometimes copy more than the requested amount,
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// up to this limit.
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//
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#define MAX_EXCESS_PULLUP 128
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//
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// For comparing IPv6 addresseses.
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//
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__inline int
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IP6_ADDR_EQUAL(const IPv6Addr *x, const IPv6Addr *y)
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{
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__int64 UNALIGNED *a;
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__int64 UNALIGNED *b;
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a = (__int64 UNALIGNED *)x;
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b = (__int64 UNALIGNED *)y;
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return (a[1] == b[1]) && (a[0] == b[0]);
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}
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//
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// The actual definition of a route cache entry
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// can be found in route.h.
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//
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typedef struct RouteCacheEntry RouteCacheEntry;
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//
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// Structure of a packet context.
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//
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// The IF field holds a reference if it is non-NULL.
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// The packet holds a reference for the sending interface
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// between IPv6SendLL and IPv6SendComplete.
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//
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// The Flags field uses NDIS Flag bits (notably NDIS_FLAGS_MULTICAST_PACKET,
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// NDIS_FLAGS_LOOPBACK_ONLY, and NDIS_FLAGS_DONT_LOOPBACK)
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// but it is NOT the same as the Private.Flags field,
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// which NDIS uses.
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//
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typedef struct Packet6Context {
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PNDIS_PACKET pc_link; // For lists of packets.
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Interface *IF; // Interface sending the packet.
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uint pc_offset; // Offset of IPv6 header.
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// pc_adjust is used by link layers when sending packets.
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// pc_nucast is used in link layers when receiving transfer-data packets.
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// pc_drop is used in NeighborCacheTimeout.
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union {
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uint pc_adjust; // See AdjustPacketBuffer.
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uint pc_nucast; // Used in lan.c transfer-data.
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int pc_drop; // See NeighborCacheTimeout.
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};
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void (*CompletionHandler)( // Called on event completion.
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PNDIS_PACKET Packet,
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IP_STATUS Status);
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void *CompletionData; // Data for completion handler.
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uint Flags;
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IPv6Addr DiscoveryAddress; // Source address for ND.
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} Packet6Context;
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//
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// The ProtocolReserved field (extra bytes after normal NDIS Packet fields)
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// is structured as a Packet6Context.
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//
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// NB: Only packets created by IPv6 have an IPv6 Packet6Context.
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// Packets that NDIS hands up to us do NOT have a Packet6Context.
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//
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__inline Packet6Context *
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PC(NDIS_PACKET *Packet)
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{
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return (Packet6Context *)Packet->ProtocolReserved;
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}
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__inline void
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InitializeNdisPacket(NDIS_PACKET *Packet)
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{
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RtlZeroMemory(PC(Packet), sizeof *PC(Packet));
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}
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//
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// Global variables exported by the IPv6 driver for use by other
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// NT kernel modules.
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//
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extern NDIS_HANDLE IPv6PacketPool, IPv6BufferPool;
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//
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// Functions exported by the IPv6 driver for use by other
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// NT kernel modules.
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//
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void
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IPv6RegisterULProtocol(uchar Protocol, void *RecvHandler, void *CtrlHandler);
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extern void
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IPv6SendComplete(void *, PNDIS_PACKET, IP_STATUS);
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extern int
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IPv6Receive(IPv6Packet *);
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extern void
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IPv6ReceiveComplete(void);
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extern void
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IPv6ProviderReady(void);
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extern void
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InitializePacketFromNdis(IPv6Packet *Packet,
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PNDIS_PACKET NdisPacket, uint Offset);
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extern uint
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GetPacketPositionFromPointer(IPv6Packet *Packet, uchar *Pointer);
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extern uint
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PacketPullupSubr(IPv6Packet *Packet, uint Needed,
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uint AlignMultiple, uint AlignOffset);
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__inline int
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PacketPullup(IPv6Packet *Packet, uint Needed,
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uint AlignMultiple, uint AlignOffset)
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{
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return (((Needed <= Packet->ContigSize) &&
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((PtrToUint(Packet->Data) & (AlignMultiple-1)) == AlignOffset)) ||
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(PacketPullupSubr(Packet, Needed,
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AlignMultiple, AlignOffset) != 0));
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}
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extern void
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PacketPullupCleanup(IPv6Packet *Packet);
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extern void
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AdjustPacketParams(IPv6Packet *Packet, uint BytesToSkip);
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extern void
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PositionPacketAt(IPv6Packet *Packet, uint NewPosition);
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extern uint
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CopyToBufferChain(PNDIS_BUFFER DstBuffer, uint DstOffset,
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PNDIS_PACKET SrcPacket, uint SrcOffset, uchar *SrcData,
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uint Length);
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extern uint
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CopyPacketToNdis(PNDIS_BUFFER DestBuf, IPv6Packet *Packet, uint Size,
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uint DestOffset, uint RcvOffset);
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extern void
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CopyPacketToBuffer(uchar *DestBuf, IPv6Packet *SrcPkt, uint Size, uint Offset);
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extern int
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CopyToNdisSafe(PNDIS_BUFFER DestBuf, PNDIS_BUFFER * ppNextBuf,
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uchar * SrcBuf, uint Size, uint * StartOffset);
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extern PNDIS_BUFFER
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CopyFlatToNdis(PNDIS_BUFFER DestBuf, uchar *SrcBuf, uint Size, uint *Offset,
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uint *BytesCopied);
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extern int
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CopyNdisToFlat(void *DstData, PNDIS_BUFFER SrcBuffer, uint SrcOffset,
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uint Length, PNDIS_BUFFER *NextBuffer, uint *NextOffset);
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extern NDIS_STATUS
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IPv6AllocatePacket(uint Length, PNDIS_PACKET *pPacket, void **pMemory);
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extern void
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IPv6FreePacket(PNDIS_PACKET Packet);
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extern void
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IPv6PacketComplete(PNDIS_PACKET Packet, IP_STATUS Status);
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#endif // IP6IMP_INCLUDED
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