Unit IPv6

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Description

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Ultibo IPv6 (Internet Protocol version 6) unit

To be documented

Constants

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IPv6 specific constants IP6_TRANSPORT_*

IP6_TRANSPORT_NAME = 'IPV6';

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IPv6 header IP6_HEADER_*

MIN_IP6_PACKET = 40;	Not Counting Adapter Header
MAX_IP6_PACKET = 1500;	Not Counting Adapter Header
MAX_FRAG_LIFE = 32000;	Only wait 32 seconds for the rest of the packet
IP6_HEADER_SIZE = 40;	SizeOf(TIP6Header); Does Not Allow for Extensions

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IPv6 extension header IP6_HEADER_*

See: https://en.wikipedia.org/wiki/List_of_IP_protocol_numbers
IP6_HEADER_HOP = 0;	Hop-by-hop option header
IP6_HEADER_TCP = 6;	Next header is a TCP segment (The payload)
IP6_HEADER_UDP = 17;	Next header is a UDP message (The payload)
IP6_HEADER_IPV6 = 41;	Next header is a IPv6 packet (IPv6 Encapsulation) (The payload)
IP6_HEADER_ROUTING = 43;	Next header is a Routing header
IP6_HEADER_FRAGMENT = 44;	Next header is a Fragmentation/reassembly header
IP6_HEADER_GRE = 47;	Next header is a GRE header
IP6_HEADER_ESP = 50;	Next header is a Encapsulating security payload
IP6_HEADER_AUTH = 51;	Next header is a Authentication header
IP6_HEADER_ICMP = 58;	Next header is a ICMP for IPv6 message
IP6_HEADER_NONE = 59;	There is no next header (Do not process payload)
IP6_HEADER_DEST = 60;	Next header is a Destination options header
IP6_HEADER_SCTP = 132;	Next header is a SCTP message (The payload)
IP6_HEADER_MOBILITY = 135;	Next header is a Mobility header
IP6_MTU = MAX_IP6_PACKET;

Type definitions

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IPv6 header

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PIP6Header = ^TIP6Header;

TIP6Header = packed record

Note: 40 Bytes
VersionClassLabel:LongWord;	Version (4 bits)(Always 6)/Traffic Class (8 bits)/Flow Label (20 bits)
PayloadLength:Word;	The size of the payload in octets, including any extension headers (The length is set to zero when a Hop-by-Hop extension header carries a Jumbo Payload option)
NextHeader:Byte;	Specifies the type of the next header (When extension headers are present in the packet this field indicates which extension header follows)
HopLimit:Byte;	This value is decremented by one at each intermediate node visited by the packet. When the counter reaches 0 the packet is discarded (Replaces the time to live field of IPv4)
SourceIP:TIn6Addr;	Source IP
DestIP:TIn6Addr;	Destination IP

IPv6 extension header

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PIP6ExtensionHeader = ^TIP6ExtensionHeader;

TIP6ExtensionHeader = packed record

Note: 2 Bytes (Common Header of all Extension Headers)
NextHeader:Byte;	Specifies the type of the next header (If zero discard the packet)
ExtensionLength:Byte;

IPv6 pseudo

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PIP6Pseudo = ^TIP6Pseudo;

TIP6Pseudo = packed record

Note: ?? Bytes (Used by UDP/TCP Checksum)
SourceIP:TIn6Addr;	Source IP
DestIP:TIn6Addr;	Destination IP
Mbz:Byte;	Must Be Zero
Protocol:Byte;	IP6 Protocol Type IPPROTO_UDP, IPPROTO_TCP etc
Length:Word;	Length of UDP/TCP Header and Data

IPv6 fragment

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PIP6Fragment = ^TIP6Fragment;

TIP6Fragment = record

Note: ?? Bytes (Used by Fragment Buffer)
Offset:LongWord;	Offset of this Fragment in the Packet
Size:Word;	Size of this Fragment
Prev:PIP6Fragment;	Pointer to Prev Fragment
Next:PIP6Fragment;	Pointer to Next Fragment

IPv6 packet

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PIP6Packet = ^TIP6Packet;

TIP6Packet = record

Note: ?? Bytes (Used by Fragment Buffer)
Lock:TMutexHandle;	Packet Lock
Id:LongWord;	IP6 Id
Dest:TIn6Addr;	IP6 Dest
Source:TIn6Addr;	IP6 Source
Data:Pointer;	Pointer to Data
Timeout:Int64;	Packet Timeout
Total:Word;	IP Total Length
Length:Word;	IP Header Length
Received:Word;	Received Bytes
Prev:PIP6Packet;	Pointer to Prev Packet
Next:PIP6Packet;	Pointer to Next Packet
First:PIP6Fragment;	Pointer to First Fragment
Last:PIP6Fragment;	Pointer to Last Fragment

Class definitions

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IPv6 buffer

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TIP6Buffer = class(TTransportBufferEx)

Note: Different to Socket Buffer.
constructor Create(ATransport:TNetworkTransport);
destructor Destroy; override;
private
FFirst:PIP6Packet;
FLast:PIP6Packet;
function GetFragment(APacket:PIP6Packet; AOffset:LongWord; ASize:Word):PIP6Fragment;
function AddFragment(APacket:PIP6Packet; AOffset:LongWord; ASize:Word):PIP6Fragment;
function RemoveFragment(APacket:PIP6Packet):Boolean;
procedure FlushFragments(APacket:PIP6Packet);
public
function GetPacket(AId:LongWord; const ASource,ADest:TIn6Addr; ALock:Boolean):PIP6Packet;
function AddPacket(AId:LongWord; const ASource,ADest:TIn6Addr; ALock:Boolean):PIP6Packet;
function RemovePacket(APacket:PIP6Packet):Boolean;
function UnlockPacket(APacket:PIP6Packet):Boolean;
procedure FlushPackets(All:Boolean);
function PutHeader(APacket:PIP6Packet; ABuffer:Pointer; ALength:Word):Boolean;
function PutFragment(APacket:PIP6Packet; ABuffer:Pointer; AOffset,ASize,AFlags:Word):Boolean;

IPv6 transport adapter

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TIP6TransportAdapter = class(TTransportAdapter)

constructor Create;
private
Address:TIn6Addr;
Netmask:TIn6Addr;
Gateway:TIn6Addr;
Network:TIn6Addr;
Directed:TIn6Addr;
Server:TIn6Addr;	DHCP Server
LeaseTime:LongWord;	DHCP Lease Time
RetryTime:Int64;	DHCP Retry Time
ExpiryTime:Int64;	DHCP Expiry Time
RenewalTime:Int64;	DHCP Renewal Time
RebindingTime:Int64;	DHCP Rebinding Time
ConfigDefault:Word;	BOOTP/DHCP/RARP/STATIC/PSEUDO/LOOPBACK
ConfigAddress:TIn6Addr;
ConfigNetmask:TIn6Addr;
ConfigGateway:TIn6Addr;
ConfigServer:TIn6Addr;

IPv6 transport binding

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TIP6TransportBinding = class(TTransportBinding)

constructor Create;
public
Address:TIn6Addr;
Netmask:TIn6Addr;
Gateway:TIn6Addr;
Network:TIn6Addr;
Directed:TIn6Addr;
Server:TIn6Addr;	DHCP Server
LeaseTime:LongWord;	DHCP Lease Time
RetryTime:Int64;	DHCP Retry Time
ExpiryTime:Int64;	DHCP Expiry Time
RenewalTime:Int64;	DHCP Renewal Time
RebindingTime:Int64;	DHCP Rebinding Time
ConfigDefault:Word;	BOOTP/DHCP/RARP/STATIC/PSEUDO/LOOPBACK
ConfigAddress:TIn6Addr;
ConfigNetmask:TIn6Addr;
ConfigGateway:TIn6Addr;
ConfigServer:TIn6Addr;

IPv6 transport protocol

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TIP6TransportProtocol = class(TTransportProtocol)

private

public

IPv6 transport filter

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TIP6TransportFilter = class(TTransportFilter)

private

public

IPv6 transport configuration

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TIP6TransportConfig = class(TTransportConfig)

private

public

IPv6 transport

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TIP6Transport = class(TNetworkTransport)

constructor Create(AManager:TTransportManager; const AName:String);
destructor Destroy; override;
private
FNextIP6Id:Word;
FNextIP6Lock:TMutexHandle;
FFragments:TIP6Buffer;
FHosts:TNetworkList;
FServs:TNetworkList;
FProtos:TNetworkList;
FRoutes:TNetworkList;
FNetworks:TNetworkList;
FAddresses:TNetworkList;
FDefaultAddress:TIn6Addr;
FLoopbackAddress:TIn6Addr;
FBroadcastAddress:TIn6Addr;
FNameservers:TIP6Nameservers;	(Part of TNetworkList)
FNameserverLock:TMutexHandle;
FDefaultHopLimit:LongWord;
FAutoRelease:Boolean;
function PacketHandler(AHandle:THandle; ASource,ADest,APacket:Pointer; ASize:Integer; ABroadcast:Boolean):Boolean;
function FragmentHandler(ASource,ADest,APacket:Pointer; ASize:Integer; ABroadcast:Boolean):Boolean;
function CheckFragment(ABuffer:Pointer):Boolean;
function GetNextIP6Id(AIncrement:Boolean):Word;
function GetIP6Nameserver(ACount:LongWord):TIn6Addr;
function GetAdapterConfigType(const AName:String):Word;
function GetAdapterConfigAddress(const AName:String):TIn6Addr;
function GetAdapterConfigNetmask(const AName:String):TIn6Addr;
function GetAdapterConfigGateway(const AName:String):TIn6Addr;
function GetAdapterConfigServer(const AName:String):TIn6Addr;
protected
function FilterPacket(ASource,ADest,APacket:Pointer; ASize:Integer; ABroadcast:Boolean):Boolean; override;
function ForwardPacket(AAdapter:TTransportAdapter; ASource,ADest,APacket:Pointer; ASize:Integer; ABroadcast:Boolean):Boolean; override;
public
property Nameservers:TIP6Nameservers read FNameservers;
property DefaultHopLimit:LongWord read FDefaultHopLimit write FDefaultHopLimit;
property AutoRelease:Boolean read FAutoRelease write FAutoRelease;
function AddAdapter(AAdapter:TNetworkAdapter; AConfigType:Word; AAddress,ANetmask,AGateway,AServer:Pointer):Boolean; override;
function RemoveAdapter(AAdapter:TNetworkAdapter):Boolean; override;
function AddProtocol(AProtocol:Word; APacketHandler:TTransportPacketHandler; AControlHandler:TTransportControlHandler):THandle; override;
function RemoveProtocol(AHandle:THandle; AProtocol:Word):Boolean; override;
function AddFilter(AProtocol:Word; AFilterHandler:TTransportFilterHandler):THandle; override;
function RemoveFilter(AHandle:THandle; AProtocol:Word):Boolean; override;
function AddConfig(AConfigType:Word; AConfigAuto:Boolean; AConfigHandler:TTransportConfigHandler):THandle; override;
function RemoveConfig(AHandle:THandle; AConfigType:Word):Boolean; override;
function SendPacket(ASocket:TTransportSocket; ASource,ADest:Pointer; APacket:PPacketFragment; ASize,AFlags:Integer):Integer; override;
function SendControl(ASource,ADest:Pointer; AProtocol,ACommand,ACode:Word; AAddress,AData:Pointer; ASize:Integer):Boolean; override;
function GetSockOpt(ASocket:TTransportSocket; ALevel,AOptName:Integer; AOptValue:PChar; var AOptLength:Integer):Integer; override;
function SetSockOpt(ASocket:TTransportSocket; ALevel,AOptName:Integer; AOptValue:PChar; AOptLength:Integer):Integer; override;
function StartTransport:Boolean; override;
function StopTransport:Boolean; override;
function ProcessTransport:Boolean; override;
function BindTransport(AAdapter:TNetworkAdapter):Boolean; override;
function UnbindTransport(AAdapter:TNetworkAdapter):Boolean; override;
function AddNameserver(const AAddress:TIn6Addr):Boolean;
function RemoveNameserver(const AAddress:TIn6Addr):Boolean;
function GetHostByName(const AName:String; ALock:Boolean):TIP6HostEntry;
function GetHostByAddress(const AAddress:TIn6Addr; ALock:Boolean):TIP6HostEntry;
function GetHostByNext(APrevious:TIP6HostEntry; ALock,AUnlock:Boolean):TIP6HostEntry;
function AddHost(const AAddress:TIn6Addr; const AName:String; AType:Word; ALock:Boolean):TIP6HostEntry;
function RemoveHost(const AAddress:TIn6Addr):Boolean;
procedure FlushHosts(All:Boolean);
function GetRouteByAddress(const AAddress:TIn6Addr; ALock:Boolean; AState:LongWord):TIP6RouteEntry;
function GetRouteByNetwork(const ANetwork,AAddress:TIn6Addr; ALock:Boolean; AState:LongWord):TIP6RouteEntry;
function GetRouteByNext(APrevious:TIP6RouteEntry; ALock,AUnlock:Boolean; AState:LongWord):TIP6RouteEntry;
function AddRoute(const ANetwork,ANetmask,AGateway,AAddress:TIn6Addr; AType:Word; ALock:Boolean; AState:LongWord):TIP6RouteEntry;
function RemoveRoute(const ANetwork,AAddress:TIn6Addr):Boolean;
procedure FlushRoutes(All:Boolean);
function GetAddressByAddress(const AAddress:TIn6Addr; ALock:Boolean; AState:LongWord):TIP6AddressEntry;
function GetAddressByNext(APrevious:TIP6AddressEntry; ALock,AUnlock:Boolean; AState:LongWord):TIP6AddressEntry;
function AddAddress(const AAddress:TIn6Addr; AType:Word; AAdapter:TNetworkAdapter; ALock:Boolean; AState:LongWord):TIP6AddressEntry;
function RemoveAddress(const AAddress:TIn6Addr):Boolean;
procedure FlushAddresses(All:Boolean);
function GetNetworkByName(const AName:String; ALock:Boolean):TIP6NetworkEntry;
function GetNetworkByAddress(const ANetwork:TIn6Addr; ALock:Boolean):TIP6NetworkEntry;
function AddNetwork(const AName:String; const ANetwork:TIn6Addr; ALock:Boolean):TIP6NetworkEntry;
function RemoveNetwork(const AName:String):Boolean;
function GetServByName(const AName,AProtocol:String; ALock:Boolean):TIP6ServEntry;
function GetServByPort(APort:Word; const AProtocol:String; ALock:Boolean):TIP6ServEntry;
function AddServ(const AName,AProtocol:String; APort:Word; ALock:Boolean):TIP6ServEntry;
function RemoveServ(const AName,AProtocol:String):Boolean;
function GetProtoByName(const AName:String; ALock:Boolean):TIP6ProtoEntry;
function GetProtoByNumber(ANumber:Word; ALock:Boolean):TIP6ProtoEntry;
function AddProto(const AName:String; ANumber:Word; ALock:Boolean):TIP6ProtoEntry;
function RemoveProto(const AName:String):Boolean;
function CompareLocal(const AAddress:TIn6Addr):Boolean;
function CompareDefault(const AAddress:TIn6Addr):Boolean;
function CompareLoopback(const AAddress:TIn6Addr):Boolean;
function CompareDirected(const AAddress:TIn6Addr):Boolean;
function CompareBroadcast(const AAddress:TIn6Addr):Boolean;
function CompareMulticast(const AAddress:TIn6Addr):Boolean;
function CompareAddress(const AAddress1,AAddress2:TIn6Addr):Boolean;
function CompareSubnet(const AAddress,ANetwork,ANetmask:TIn6Addr):Boolean;

IPv6 state

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TIP6State = class(TTransportState)

constructor Create;
private
FLocalAddress:TIn6Addr;
FRemoteAddress:TIn6Addr;
procedure SetLocalAddress(const ALocalAddress:TIn6Addr);
procedure SetRemoteAddress(const ARemoteAddress:TIn6Addr);
public
property LocalAddress:TIn6Addr read FLocalAddress write SetLocalAddress;
property RemoteAddress:TIn6Addr read FRemoteAddress write SetRemoteAddress;

IPv6 options

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TIP6Options = class(TTransportOptions)

constructor Create;
destructor Destroy; override;
private
FHopLimit:Byte;	Hop Limit
procedure SetHopLimit(AHopLimit:Byte);
public
property HopLimit:Byte read FHopLimit write SetHopLimit;

IPv6 host entry

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TIP6HostEntry = class(THostEntry)

constructor Create;
private
FAddresses:array[0..MAX_HOST_ALIASES - 1] of TIn6Addr;
function GetAddress:TIn6Addr;
procedure SetAddress(const AAddress:TIn6Addr);
function GetAddresses(Index:Integer):TIn6Addr;
public
property Address:TIn6Addr read GetAddress write SetAddress;
property Addresses[Index:Integer]:TIn6Addr read GetAddresses;
function FindAddress(const AAddress:TIn6Addr):Boolean;
function AddAddress(const AAddress:TIn6Addr):Boolean;
function RemoveAddress(const AAddress:TIn6Addr):Boolean;

IPv6 route entry

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TIP6RouteEntry = class(TRouteEntry)

constructor Create;
private
FNetwork:TIn6Addr;
FNetmask:TIn6Addr;
FGateway:TIn6Addr;
FAddress:TIn6Addr;
procedure SetNetwork(const ANetwork:TIn6Addr);
procedure SetNetmask(const ANetmask:TIn6Addr);
procedure SetGateway(const AGateway:TIn6Addr);
procedure SetAddress(const AAddress:TIn6Addr);
public
property Network:TIn6Addr read FNetwork write SetNetwork;
property Netmask:TIn6Addr read FNetmask write SetNetmask;
property Gateway:TIn6Addr read FGateway write SetGateway;
property Address:TIn6Addr read FAddress write SetAddress;

IPv6 address entry

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TIP6AddressEntry = class(TAddressEntry)

Note: Used for secondary addresses.
constructor Create;
private
FAddress:TIn6Addr;
procedure SetAddress(const AAddress:TIn6Addr);
public
property Address:TIn6Addr read FAddress write SetAddress;

IPv6 network entry

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TIP6NetworkEntry = class(TNetworkEntry)

constructor Create;
private
FNetwork:TIn6Addr;
procedure SetNetwork(const ANetwork:TIn6Addr);
public
property Network:TIn6Addr read FNetwork write SetNetwork;

IPv6 service entry

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TIP6ServEntry = class(TServEntry)

constructor Create;
private
public

IPv6 protocol entry

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TIP6ProtoEntry = class(TProtoEntry)

constructor Create;
private
public

Public variables

---

None defined

Function declarations

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Initialization functions

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procedure IP6Init;

Description: To be documented

Note	None documented

IPv6 functions

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function CheckIP6(ABuffer:Pointer):Boolean;

Description: Verify that the packet is a valid IP6 packet

Buffer	Complete packet without Adapter header

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function GetIP6Protocol(ABuffer:Pointer):Byte;

Description: To be documented

Buffer	Complete packet including Transport header

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function GetIP6HeaderOffset(ABuffer:Pointer):Word;

Description: Return Start of the IP6 Header (Start of Packet)

Buffer	Complete packet including Transport header

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function GetIP6HeaderLength(ABuffer:Pointer):Word;

Description: Return Size of IP6 Header (Including Options)

Buffer	Complete packet including Transport header

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function GetIP6DataOffset(ABuffer:Pointer):Word;

Description: Return Start of IP6 Packet Data (Length of IP6 Header)

Buffer	Complete packet including Transport header

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function GetIP6DataLength(ABuffer:Pointer):Word;

Description: Return Size of IP6 Packet Data (IP6 TotalLength - IP6 Header)

Buffer	Complete packet including Transport header

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function ChecksumIP6(ABuffer:Pointer; AOffset,ALength:Word):Word;

Description: Validate the IP6 Header and Options Checksum on Receive

Buffer	Complete packet including Transport header

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