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Description
Ultibo IPv6 (Internet Protocol Version 6) unit
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;
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Not Counting Adapter Header
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MAX_IP6_PACKET = 1500;
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Not Counting Adapter Header
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MAX_FRAG_LIFE = 32000;
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Only wait 32 seconds for the rest of the packet
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IP6_HEADER_SIZE = 40;
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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
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IP6_HEADER_HOP = 0;
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Hop-by-hop option header
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IP6_HEADER_TCP = 6;
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Next header is a TCP segment (The payload)
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IP6_HEADER_UDP = 17;
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Next header is a UDP message (The payload)
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IP6_HEADER_IPV6 = 41;
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Next header is a IPv6 packet (IPv6 Encapsulation) (The payload)
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IP6_HEADER_ROUTING = 43;
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Next header is a Routing header
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IP6_HEADER_FRAGMENT = 44;
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Next header is a Fragmentation/reassembly header
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IP6_HEADER_GRE = 47;
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Next header is a GRE header
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IP6_HEADER_ESP = 50;
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Next header is a Encapsulating security payload
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IP6_HEADER_AUTH = 51;
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Next header is a Authentication header
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IP6_HEADER_ICMP = 58;
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Next header is a ICMP for IPv6 message
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IP6_HEADER_NONE = 59;
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There is no next header (Do not process payload)
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IP6_HEADER_DEST = 60;
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Next header is a Destination options header
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IP6_HEADER_SCTP = 132;
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Next header is a SCTP message (The payload)
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IP6_HEADER_MOBILITY = 135;
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Next header is a Mobility header
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IP6_MTU = MAX_IP6_PACKET;
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Type definitions
IPv6 header
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PIP6Header = ^TIP6Header;
TIP6Header = packed record
| Note: 40 Bytes
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VersionClassLabel:LongWord;
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Version (4 bits)(Always 6)/Traffic Class (8 bits)/Flow Label (20 bits)
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PayloadLength:Word;
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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)
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NextHeader:Byte;
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Specifies the type of the next header (When extension headers are present in the packet this field indicates which extension header follows)
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HopLimit:Byte;
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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)
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SourceIP:TIn6Addr;
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Source IP
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DestIP:TIn6Addr;
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Destination IP
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IPv6 extension header
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PIP6ExtensionHeader = ^TIP6ExtensionHeader;
TIP6ExtensionHeader = packed record
| Note: 2 Bytes (Common Header of all Extension Headers)
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NextHeader:Byte;
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Specifies the type of the next header (If zero discard the packet)
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ExtensionLength:Byte;
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IPv6 pseudo
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PIP6Pseudo = ^TIP6Pseudo;
TIP6Pseudo = packed record
| Note: ?? Bytes (Used by UDP/TCP Checksum)
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SourceIP:TIn6Addr;
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Source IP
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DestIP:TIn6Addr;
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Destination IP
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Mbz:Byte;
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Must Be Zero
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Protocol:Byte;
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IP6 Protocol Type IPPROTO_UDP, IPPROTO_TCP etc
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Length:Word;
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Length of UDP/TCP Header and Data
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IPv6 fragment
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PIP6Fragment = ^TIP6Fragment;
TIP6Fragment = record
| Note: ?? Bytes (Used by Fragment Buffer)
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Offset:LongWord;
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Offset of this Fragment in the Packet
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Size:Word;
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Size of this Fragment
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Prev:PIP6Fragment;
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Pointer to Prev Fragment
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Next:PIP6Fragment;
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Pointer to Next Fragment
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IPv6 packet
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PIP6Packet = ^TIP6Packet;
TIP6Packet = record
| Note: ?? Bytes (Used by Fragment Buffer)
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Lock:TMutexHandle;
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Packet Lock
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Id:LongWord;
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IP6 Id
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Dest:TIn6Addr;
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IP6 Dest
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Source:TIn6Addr;
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IP6 Source
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Data:Pointer;
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Pointer to Data
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Timeout:Int64;
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Packet Timeout
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Total:Word;
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IP Total Length
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Length:Word;
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IP Header Length
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Received:Word;
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Received Bytes
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Prev:PIP6Packet;
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Pointer to Prev Packet
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Next:PIP6Packet;
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Pointer to Next Packet
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First:PIP6Fragment;
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Pointer to First Fragment
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Last:PIP6Fragment;
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Pointer to Last Fragment
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Class definitions
IPv6 specific classes
Public variables
None defined
Function declarations
Initialization functions
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procedure IP6Init;
Description: To be documented
IPv6 functions
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function CheckIP6(ABuffer:Pointer):Boolean;
Description: Verify that the packet is a valid IP6 packet
| Buffer
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Complete packet without Adapter header
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function GetIP6Protocol(ABuffer:Pointer):Byte;
Description: To be documented
| Buffer
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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
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Complete packet including Transport header
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function GetIP6HeaderLength(ABuffer:Pointer):Word;
Description: Return Size of IP6 Header (Including Options)
| Buffer
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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
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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
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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
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Complete packet including Transport header
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