Unit ICMPv6

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Description

Ultibo ICMPv6 (Internet Control Message Protocol version 6) unit

To be documented

Constants


ICMPv6 protocol ICMP6_PROTOCOL_*
Note: Some ICMPV6 definitions are in the Protocol or IPv6 modules
 
ICMP6_PROTOCOL_NAME = 'ICMPV6';  


ICMPv6 specific constants ICMP6_*
ICMP6_TIMEOUT = 0; Wait forever on a ICMP6 Read
ICMP6_BUFFER_SIZE = 65536; ICMP6 Receive Buffer Size
 
ICMP6_HEADER_SIZE = 5; SizeOf(TICMP6Header);
 
ICMP6_PACKET_SIZE = 8; SizeOf(TICMP6Packet)


Type definitions


ICMPv6 header

PICMP6Header = ^TICMP6Header;

TICMP6Header = packed record

Note: Some ICMPv6 definitions are in the Protocol or IPv6 modules
ICMP6Type:Byte; ICMP_UNREACH etc
Code:Byte; ICMP_UNREACH_NET,ICMP_UNREACH_PORT etc
Checksum:Word; 1s Compliment checksum of Structure
CurrentHopLimit:Byte;  

ICMPv6 packet

PICMP6Packet = ^TICMP6Packet;

TICMP6Packet = record

Note: 8 Bytes (Used by ICMP6Buffer)
Size:LongWord; LongWord to keep size even
Next:PICMP6Packet; Followed by RemoteAddress (4 or 16 Bytes)


Class definitions


ICMPv6 protocol transport

TICMP6ProtocolTransport = class(TProtocolTransport)

constructor Create;  
destructor Destroy; override;  
public
Socket:TICMP6Socket; Socket for sending replies

ICMPv6 protocol

TICMP6Protocol = class(TNetworkProtocol)

constructor Create(AManager:TProtocolManager; const AName:String);  
destructor Destroy; override;  
private
FNextICMP6Id:Word;  
FNextICMP6Lock:TMutexHandle;  
 
function PacketHandler(AHandle:THandle; ASource,ADest,APacket:Pointer; ASize:Integer; ABroadcast:Boolean):Boolean;  
function ControlHandler(AHandle:THandle; ASource,ADest:Pointer; AProtocol,ACommand,ACode:Word; AAddress,AData:Pointer; ASize:Integer):Boolean;  
 
function GetNextICMP6Id(AIncrement:Boolean):Word;  
protected
function SelectCheck(ASource,ADest:PFDSet; ACode:Integer):Integer; override;  
function SelectWait(ASocket:TProtocolSocket; ACode:Integer; ATimeout:LongWord):Integer; override;  
 
function SendPacket(ASocket:TProtocolSocket; ASource,ADest:Pointer; ASourcePort,ADestPort:Word; APacket:PPacketFragment; ASize,AFlags:Integer):Integer; override;  
public
function Accept(ASocket:TProtocolSocket; ASockAddr:PSockAddr; AAddrLength:PInteger):TProtocolSocket; override;  
function Bind(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; AAddrLength:Integer):Integer; override;  
function CloseSocket(ASocket:TProtocolSocket):Integer; override;  
function Connect(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; AAddrLength:Integer):Integer; override;  
function IoctlSocket(ASocket:TProtocolSocket; ACmd:DWORD; var AArg:u_long):Integer; override;  
function GetPeerName(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; var AAddrLength:Integer):Integer; override;  
function GetSockName(ASocket:TProtocolSocket; var ASockAddr:TSockAddr; var AAddrLength:Integer):Integer; override;  
function GetSockOpt(ASocket:TProtocolSocket; ALevel,AOptName:Integer; AOptValue:PChar; var AOptLength:Integer):Integer; override;  
function Listen(ASocket:TProtocolSocket; ABacklog:Integer):Integer; override;  
function Recv(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer):Integer; override;  
function RecvFrom(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer; var AFromAddr:TSockAddr; var AFromLength:Integer):Integer; override;  
function Select(ANfds:Integer; AReadfds,AWritefds,AExceptfds:PFDSet; ATimeout:PTimeVal):LongInt; override;  
function Send(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer):Integer; override;  
function SendTo(ASocket:TProtocolSocket; var ABuffer; ALength,AFlags:Integer; var AToAddr:TSockAddr; AToLength:Integer):Integer; override;  
function SetSockOpt(ASocket:TProtocolSocket; ALevel,AOptName:Integer; AOptValue:PChar; AOptLength:Integer):Integer; override;  
function Shutdown(ASocket:TProtocolSocket; AHow:Integer):Integer; override;  
function Socket(AFamily,AStruct,AProtocol:Integer):TProtocolSocket; override;  
 
function AddTransport(ATransport:TNetworkTransport):Boolean; override;  
function RemoveTransport(ATransport:TNetworkTransport):Boolean; override;  
 
function FindSocket(AFamily,AStruct,AProtocol:Word; ALocalAddress,ARemoteAddress:Pointer; ALocalPort,ARemotePort:Word; ABroadcast,AListen,ALock:Boolean; AState:LongWord):TProtocolSocket; override;  
procedure FlushSockets(All:Boolean); override;  
 
function StartProtocol:Boolean; override;  
function StopProtocol:Boolean; override;  
function ProcessProtocol:Boolean; override;  

ICMPv6 socket

TICMP6Socket = class(TProtocolSocket)

Note: SOCK_RAW
 
constructor Create(AProtocol:TNetworkProtocol; ATransport:TNetworkTransport);  
destructor Destroy; override;  
private
FRecvData:TICMP6Buffer;  
public
property RecvData:TICMP6Buffer read FRecvData;  
 
function IoCtl(ACommand:DWORD; var AArgument:u_long):Integer; override;  
 
function IsConnected(ALocalAddress,ARemoteAddress:Pointer; ALocalPort,ARemotePort:Word; ABroadcast:Boolean):Boolean; override;  
function IsListening(ALocalAddress,ARemoteAddress:Pointer; ALocalPort,ARemotePort:Word; ABroadcast:Boolean):Boolean; override;  

ICMPv6 buffer

TICMP6Buffer = class(TSocketBuffer)

constructor Create(ASocket:TTransportSocket);  
destructor Destroy; override;  
private
FOffset:Word; Offset to RemoteAddress
FLength:Word; Length of RemoteAddress
 
FRead:Pointer; Pointer to Next Read from Buffer
FWrite:Pointer; Pointer to Next Write to Buffer
 
FCount:LongWord; Number of Packets in Buffer
 
FFirst:PICMP6Packet; Pointer to First Packet
FLast:PICMP6Packet; Pointer to Last Packet
 
function AddPacket(ASize:Integer):Boolean;  
function RemovePacket:Boolean;  
procedure FlushPackets;  
protected
procedure SetSize(ASize:LongWord); override;  
public
function GetNext:Integer;  
function GetCount:LongWord;  
 
function ReadBuffer(var ABuffer; var ASize:Integer; ARemoteAddress:Pointer; AFlags:Integer):Boolean;  
function WriteBuffer(var ABuffer; ASize:Integer; ARemoteAddress:Pointer):Boolean;  


Public variables

None defined

Function declarations


Initialization functions 

procedure ICMP6Init;
Description: To be documented
Note None documented


ICMPv6 functions 

function CheckICMP6(AFamily:Word; ABuffer:Pointer):Boolean;
Description: Verify that the packet is a valid ICMP6 packet
Buffer The complete packet including Transport header 


function GetICMP6HeaderOffset(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
Buffer The complete packet including Transport header 


function GetICMP6HeaderLength(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
Buffer The complete packet including Transport header 


function GetICMP6DataOffset(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
Buffer The complete packet including Transport header 


function GetICMP6DataLength(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
Buffer The complete packet including Transport header 


function ChecksumICMP6(AFamily:Word; ABuffer:Pointer; AOffset,ALength:Word):Word;
Description: Checksum the ICMP6 Header on Send/Validate the Checksum on Receive
Note None documented


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