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Description
Ultibo IP (Internet Protocol) unit
Constants
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IP specific constants IP_TRANSPORT_NAME*
IP_TRANSPORT_NAME = 'IP';
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IP size IP_*_SIZE
MIN_IP_PACKET = 20;
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Not Counting Adapter Header
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MAX_IP_PACKET = 65536;
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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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IP_HEADER_SIZE = 20;
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SizeOf(TIPHeader); (Does Not Allow for Options)
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IP_OPTIONS_SIZE = 40;
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Maximum Allowed Options
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IP_PSEUDO_SIZE = 12;
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SizeOf(TPseudoHeader);
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IP_PACKET_SIZE = 56;
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SizeOf(TIPPacket); (Previously 46)
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IP_FRAGMENT_SIZE = 12;
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SizeOf(TIPFragment);
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[Expand]
IP header flags/fragment offset IP_*
IP_CE = $8000;
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Congestion Experienced
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IP_DF = $4000;
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1 = Don't Fragment 0 = May Fragment
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IP_MF = $2000;
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1 = More Fragments 0 = Last Fragment
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IP_OFFMASK = $1FFF;
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Fragment Offset Mask
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[Expand]
IP header options IPOPT_*
IPOPT_EOL = 0;
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end-of-option list
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IPOPT_NOP = 1;
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no-operation
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IPOPT_RR = 7;
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record packet route
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IPOPT_TS = 68;
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timestamp
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IPOPT_SECURITY = 130;
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provide s,c,h,tcc
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IPOPT_LSRR = 131;
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loose source route
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IPOPT_SATID = 136;
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satnet Id
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IPOPT_SSRR = 137;
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strict source route
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IPOPT_RA = 148;
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router alert
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[Expand]
IP offset options IPOPT_OFFSET*
| Offsets to fields in IP Options other than EOL and NOP
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IPOPT_OPTVAL = 0;
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option ID
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IPOPT_OLEN = 1;
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option length
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IPOPT_OFFSET = 2;
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offset within option
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IPOPT_MINOFF = 4;
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min value of above
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[Expand]
IP TS flag options IPOPT_TS_*
| Flags for IPOPT_TS Flags
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IPOPT_TS_TSONLY = 0;
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timestamps only
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IPOPT_TS_TSANDADDR = 1;
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timestamps and addresses
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IPOPT_TS_PRESPEC = 3;
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specified modules only
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[Expand]
IP security flag IPOPT_SECUR_*
| Flags for IPOPT_SECURITY Flags (Network Order)
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IPOPT_SECUR_UNCLASS = $0000;
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IPOPT_SECUR_CONFID = $F135;
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IPOPT_SECUR_EFTO = $789A;
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IPOPT_SECUR_MMMM = $BC4D;
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IPOPT_SECUR_RESTR = $AF13;
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IPOPT_SECUR_SECRET = $D788;
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IPOPT_SECUR_TOPSECRET = $6BC5;
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[Expand]
IP type of service IPTOS_*
IPTOS_LOWDELAY = $10;
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IPTOS_THROUGHPUT = $08;
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IPTOS_RELIABILITY = $04;
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IPTOS_MINCOST = $02;
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Type definitions
IP header
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PIPHeader = ^TIPHeader;
TIPHeader = packed record
| Note: 20 Bytes unless IP Options are added
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VersionLength:Byte;
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$45 for IPv4 and 20-byte header
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TOS:Byte;
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throughput type of service
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TotalLength:Word;
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Total Size of the Packet (Max 65535) (Network Order)
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Id:Word;
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Incremented with each Packet (Network Order)
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FragOffset:Word;
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and IP Header Flags DF, MF etc (Network Order)
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TTL:Byte;
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Time to Live Seconds/Hops
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Protocol:Byte;
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IPPROTO_IP, IPPROTO_TCP etc
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Checksum:Word;
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1s Compliment checksum
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SourceIP:TInAddr;
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Source IP (Network Order)
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DestIP:TInAddr;
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Destination IP (Network Order)
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IP timestamp address
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PIPTimestampAddress = ^TIPTimestampAddress;
TIPTimestampAddress = packed record
Address:TInAddr;
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Timestamp:LongWord;
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IP timestamp
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PIPTimestamp = ^TIPTimestamp;
TIPTimestamp = packed record
Code:Byte;
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IPOPT_TS
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Length:Byte;
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Size of structure (Variable)
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Index:Byte;
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Index of current entry
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FlagsOverflow:Byte;
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Flags (4 Bits) Overflow counter (4 Bits)
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case Integer of
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0:(Timestamp:LongWord);
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1:(TimestampAddress:TIPTimestampAddress);
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IP pseudo
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PIPPseudo = ^TIPPseudo;
TIPPseudo = packed record
| Note: 12 Bytes (Used by UDP/TCP Checksum)
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SourceIP:TInAddr;
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Source IP Network Order
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DestIP:TInAddr;
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Destination IP Network Order
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Mbz:Byte;
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Must Be Zero
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Protocol:Byte;
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IP 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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IP fragment
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PIPFragment = ^TIPFragment;
TIPFragment = record
| Note: 12 Bytes (Used by Fragment Buffer)
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Offset:Word;
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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:PIPFragment;
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Pointer to Prev Fragment
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Next:PIPFragment;
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Pointer to Next Fragment
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IP packet
[Expand]
PIPPacket = ^TIPPacket;
TIPPacket = record
| Note: 56 Bytes (Used by Fragment Buffer)
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Lock:TMutexHandle;
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Packet Lock
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Id:Word;
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IP Id
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Protocol:Word;
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IP Protocol
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Dest:TInAddr;
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IP Dest
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Source:TInAddr;
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IP 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:PIPPacket;
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Pointer to Prev Packet
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Next:PIPPacket;
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Pointer to Next Packet
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First:PIPFragment;
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Pointer to First Fragment
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Last:PIPFragment;
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Pointer to Last Fragment
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Class definitions
IP specific classes
Public variables
None defined
Function declarations
Initialization functions
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procedure IPInit;
Description: To be documented
IP functions
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function CheckIP(ABuffer:Pointer):Boolean;
Description: Verify that the packet is a valid IP packet
| Buffer
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Complete packet without Adapter header
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function GetIPHeaderOffset(ABuffer:Pointer):Word;
Description: Return Start of the IP Header (Start of Packet)
| Buffer
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Complete packet including Transport header
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function GetIPHeaderLength(ABuffer:Pointer):Word;
Description: Return Size of IP Header (Including Options)
| Buffer
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Complete packet including Transport header
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function GetIPOptionsLength(ABuffer:Pointer):Word;
Description: Return Size of IP Options (Header - IP_HEADER_SIZE)
| Buffer
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Complete packet including Transport header
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function GetIPDataOffset(ABuffer:Pointer):Word;
Description: Return Start of IP Packet Data (Length of IP Header)
| Buffer
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Complete packet including Transport header
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[Expand]
function GetIPDataLength(ABuffer:Pointer):Word;
Description: Return Size of IP Packet Data (IP TotalLength - IP Header)
| Buffer
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Complete packet including Transport header
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[Expand]
function ChecksumIPRecv(ABuffer:Pointer; AOffset,ALength:Word):Word;
Description: Validate the IP Header and Options Checksum on Receive
| Buffer
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Complete packet including Transport header
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[Expand]
function ChecksumIPSend(AHeader,AOptions:Pointer; ALength:Word):Word;
Description: Checksum the IP Header and Options on Send
| Buffer
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Complete packet including Transport header
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