Difference between revisions of "Unit IP"

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----
 
----
  
−
''To be documented''
+
 
 +
'''IP header'''
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 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PIPHeader = ^TIPHeader;</code>
 +
 
 +
<code>TIPHeader = packed record</code>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
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|-
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|colspan="2"|Note: 20 Bytes unless IP Options are added
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|-
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| <code>VersionLength:Byte;</code>
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| $45 for IPv4 and 20-byte header
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|-
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| <code>TOS:Byte;</code>
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| throughput type of service
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|-
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| <code>TotalLength:Word;</code>
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| Total Size of the Packet (Max 65535) (Network Order)
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|-
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| <code>Id:Word;</code>
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| Incremented with each Packet (Network Order)
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|-
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| <code>FragOffset:Word;</code>
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| and IP Header Flags DF, MF etc (Network Order)
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|-
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| <code>TTL:Byte;</code>
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| Time to Live Seconds / Hops
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|-
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| <code>Protocol:Byte;</code>
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| IPPROTO_IP, IPPROTO_TCP etc
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|-
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| <code>Checksum:Word;</code>
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| 1s Compliment checksum
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|-
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| <code>SourceIP:TInAddr;</code>
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| Source IP (Network Order)
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|-
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| <code>DestIP:TInAddr;</code>
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| Destination IP (Network Order)
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|-
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|}
 +
</div></div> 
 +
 
 +
'''IP timestamp address'''
 +
 
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PIPTimestampAddress = ^TIPTimestampAddress;</code>
 +
 
 +
<code>TIPTimestampAddress = packed record</code>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
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|-
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| <code>Address:TInAddr;</code>
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| style="width: 50%;"|&nbsp;
 +
|-
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| <code>Timestamp:LongWord;</code>
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| &nbsp;
 +
|-
 +
|}
 +
</div></div> 
 +
 +
'''IP timestamp'''
 +
 
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PIPTimestamp = ^TIPTimestamp;</code>
 +
 
 +
<code>TIPTimestamp = packed record</code>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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{| class="wikitable" style="font-size: 14px; background: white;"
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|-
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| <code>Code:Byte;</code>
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| IPOPT_TS
 +
|-
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| <code>Length:Byte;</code>
 +
| Size of structure (Variable)
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|-
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| <code>Index:Byte;</code>
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| Index of current entry
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|-
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| <code>FlagsOverflow:Byte;</code>
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| Flags (4 Bits) Overflow counter (4 Bits)
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|-
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| <code>case Integer of</code>
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| &nbsp;
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|-
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| <code>0:(Timestamp:LongWord);</code>
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| &nbsp;
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|-
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| <code>1:(TimestampAddress:TIPTimestampAddress);</code>
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| &nbsp;
 +
|-
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|}
 +
</div></div> 
 +
 
 +
'''IP pseudo'''
 +
 
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PIPPseudo = ^TIPPseudo;</code>
 +
 
 +
<code>TIPPseudo = packed record</code>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
|colspan="2"|Note: 12 Bytes (Used by UDP/TCP Checksum)
 +
|-
 +
| <code>SourceIP:TInAddr;</code>
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| Source IP Network Order
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|-
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| <code>DestIP:TInAddr;</code>
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| Destination IP Network Order
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|-
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| <code>Mbz:Byte;</code>
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| Must Be Zero
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|-
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| <code>Protocol:Byte;</code>
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| IP Protocol Type IPPROTO_UDP, IPPROTO_TCP etc
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|-
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| <code>Length:Word;</code>
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| Length of UDP/TCP Header and Data
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|-
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|}
 +
</div></div> 
 +
 
 +
'''IP fragment''' 
 +
 
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PIPFragment = ^TIPFragment;</code>
 +
 
 +
<code>TIPFragment = record</code>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
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|-
 +
|colspan="2"|Note: 12 Bytes (Used by Fragment Buffer)
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|-
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| <code>Offset:Word;</code>
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| Offset of this Fragment in the Packet
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|-
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| <code>Size:Word;</code>
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| Size of this Fragment
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|-
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|colspan="2"|&nbsp;
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|-
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| <code>Prev:PIPFragment;</code>
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| Pointer to Prev Fragment
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|-
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| <code>Next:PIPFragment;</code>
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| Pointer to Next Fragment
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|-
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|}
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</div></div> 
 +
 
 +
'''IP packet''' 
 +
 
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PIPPacket = ^TIPPacket;</code>
 +
 
 +
<code>TIPPacket = record</code>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
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|-
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|colspan="2"|Note: 56 Bytes (Used by Fragment Buffer)
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|-
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| <code>Lock:TMutexHandle;</code>
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| Packet Lock
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|-
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|colspan="2"|&nbsp;
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|-
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| <code>Id:Word;</code>
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| IP Id
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|-
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| <code>Protocol:Word;</code>
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| IP Protocol
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|-
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| <code>Dest:TInAddr;</code>
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| IP Dest
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|-
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| <code>Source:TInAddr;</code>
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| IP Source
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|-
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|colspan="2"|&nbsp;
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|-
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| <code>Data:Pointer;</code>
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| Pointer to Data
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|-
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| <code>Timeout:Int64;</code>
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| Packet Timeout
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|-
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| <code>Total:Word;</code>
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| IP Total Length
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|-
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| <code>Length:Word;</code>
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| IP Header Length
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|-
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| <code>Received:Word;</code>
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| Received Bytes
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|-
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|colspan="2"|&nbsp;
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|-
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| <code>Prev:PIPPacket;</code>
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| Pointer to Prev Packet
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|-
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| <code>Next:PIPPacket;</code>
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| Pointer to Next Packet
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|-
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|colspan="2"|&nbsp;
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|-
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| <code>First:PIPFragment;</code>
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| Pointer to First Fragment
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|-
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| <code>Last:PIPFragment;</code>
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| Pointer to Last Fragment
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|-
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|}
 +
</div></div> 
 +
<br />
  
 
=== Class definitions ===
 
=== Class definitions ===

Revision as of 01:37, 20 January 2017

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Description

Ultibo IP (Internet Protocol) unit

To be documented

Constants


IP specific constants IP_TRANSPORT_NAME*
IP_TRANSPORT_NAME = 'IP';  


IP constants IP_*_SIZE
MIN_IP_PACKET = 20; Not Counting Adapter Header
MAX_IP_PACKET = 65536; Not Counting Adapter Header
 
MAX_FRAG_LIFE = 32000; Only wait 32 seconds for the rest of the packet
 
IP_HEADER_SIZE = 20; SizeOf(TIPHeader); (Does Not Allow for Options)
IP_OPTIONS_SIZE = 40; Maximum Allowed Options
IP_PSEUDO_SIZE = 12; SizeOf(TPseudoHeader);
 
IP_PACKET_SIZE = 56; SizeOf(TIPPacket); (Previously 46)
IP_FRAGMENT_SIZE = 12; SizeOf(TIPFragment);


IP header flags / fragment offset constants IP_*
IP_CE = $8000; Congestion Experienced
IP_DF = $4000; 1 = Don't Fragment 0 = May Fragment
IP_MF = $2000; 1 = More Fragments 0 = Last Fragment
IP_OFFMASK = $1FFF; Fragment Offset Mask


IP header option constants IPOPT_*
IPOPT_EOL = 0; end-of-option list
IPOPT_NOP = 1; no-operation
IPOPT_RR = 7; record packet route
IPOPT_TS = 68; timestamp
IPOPT_SECURITY = 130; provide s,c,h,tcc
IPOPT_LSRR = 131; loose source route
IPOPT_SATID = 136; satnet id
IPOPT_SSRR = 137; strict source route
IPOPT_RA = 148; router alert


IP offset option constants IPOPT_OFFSET*
Offsets to fields in IP Options other than EOL and NOP
 
IPOPT_OPTVAL = 0; option ID
IPOPT_OLEN = 1; option length
IPOPT_OFFSET = 2; offset within option
IPOPT_MINOFF = 4; min value of above


IP TS flag option constants IPOPT_TS_*
Flags for IPOPT_TS Flags
 
IPOPT_TS_TSONLY = 0; timestamps only
IPOPT_TS_TSANDADDR = 1; timestamps and addresses
IPOPT_TS_PRESPEC = 3; specified modules only


IP security flag constants IPOPT_SECUR_*
Flags for IPOPT_SECURITY Flags (Network Order)
 
IPOPT_SECUR_UNCLASS = $0000;  
IPOPT_SECUR_CONFID = $F135;  
IPOPT_SECUR_EFTO = $789A;  
IPOPT_SECUR_MMMM = $BC4D;  
IPOPT_SECUR_RESTR = $AF13;  
IPOPT_SECUR_SECRET = $D788;  
IPOPT_SECUR_TOPSECRET = $6BC5;  


IP type of service constants IPTOS_*
IPTOS_LOWDELAY = $10;  
IPTOS_THROUGHPUT = $08;  
IPTOS_RELIABILITY = $04;  
IPTOS_MINCOST = $02;  


Type definitions


IP header

PIPHeader = ^TIPHeader;

TIPHeader = packed record

Note: 20 Bytes unless IP Options are added
VersionLength:Byte; $45 for IPv4 and 20-byte header
TOS:Byte; throughput type of service
TotalLength:Word; Total Size of the Packet (Max 65535) (Network Order)
Id:Word; Incremented with each Packet (Network Order)
FragOffset:Word; and IP Header Flags DF, MF etc (Network Order)
TTL:Byte; Time to Live Seconds / Hops
Protocol:Byte; IPPROTO_IP, IPPROTO_TCP etc
Checksum:Word; 1s Compliment checksum
SourceIP:TInAddr; Source IP (Network Order)
DestIP:TInAddr; Destination IP (Network Order)

IP timestamp address

PIPTimestampAddress = ^TIPTimestampAddress;

TIPTimestampAddress = packed record

Address:TInAddr;  
Timestamp:LongWord;  

IP timestamp

PIPTimestamp = ^TIPTimestamp;

TIPTimestamp = packed record

Code:Byte; IPOPT_TS
Length:Byte; Size of structure (Variable)
Index:Byte; Index of current entry
FlagsOverflow:Byte; Flags (4 Bits) Overflow counter (4 Bits)
case Integer of  
0:(Timestamp:LongWord);  
1:(TimestampAddress:TIPTimestampAddress);  

IP pseudo

PIPPseudo = ^TIPPseudo;

TIPPseudo = packed record

Note: 12 Bytes (Used by UDP/TCP Checksum)
SourceIP:TInAddr; Source IP Network Order
DestIP:TInAddr; Destination IP Network Order
Mbz:Byte; Must Be Zero
Protocol:Byte; IP Protocol Type IPPROTO_UDP, IPPROTO_TCP etc
Length:Word; Length of UDP/TCP Header and Data

IP fragment

PIPFragment = ^TIPFragment;

TIPFragment = record

Note: 12 Bytes (Used by Fragment Buffer)
Offset:Word; Offset of this Fragment in the Packet
Size:Word; Size of this Fragment
 
Prev:PIPFragment; Pointer to Prev Fragment
Next:PIPFragment; Pointer to Next Fragment

IP packet

PIPPacket = ^TIPPacket;

TIPPacket = record

Note: 56 Bytes (Used by Fragment Buffer)
Lock:TMutexHandle; Packet Lock
 
Id:Word; IP Id
Protocol:Word; IP Protocol
Dest:TInAddr; IP Dest
Source:TInAddr; IP 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:PIPPacket; Pointer to Prev Packet
Next:PIPPacket; Pointer to Next Packet
 
First:PIPFragment; Pointer to First Fragment
Last:PIPFragment; Pointer to Last Fragment


Class definitions

To be documented

Public variables

None defined

Function declarations


Initialization functions 

procedure IPInit;
Description: To be documented
Note None documented


IP functions 

function CheckIP(ABuffer:Pointer):Boolean;
Description: Verify that the packet is a valid IP packet
Buffer Complete packet without Adapter header 


function GetIPHeaderOffset(ABuffer:Pointer):Word;
Description: Return Start of the IP Header (Start of Packet)
Buffer Complete packet including Transport header 


function GetIPHeaderLength(ABuffer:Pointer):Word;
Description: Return Size of IP Header (Including Options)
Buffer Complete packet including Transport header 


function GetIPOptionsLength(ABuffer:Pointer):Word;
Description: Return Size of IP Options (Header - IP_HEADER_SIZE)
Buffer Complete packet including Transport header 


function GetIPDataOffset(ABuffer:Pointer):Word;
Description: Return Start of IP Packet Data (Length of IP Header)
Buffer Complete packet including Transport header 


function GetIPDataLength(ABuffer:Pointer):Word;
Description: Return Size of IP Packet Data (IP TotalLength - IP Header)
Buffer Complete packet including Transport header 


function ChecksumIPRecv(ABuffer:Pointer; AOffset,ALength:Word):Word;
Description: Validate the IP Header and Options Checksum on Receive
Buffer Complete packet including Transport header 


function ChecksumIPSend(AHeader,AOptions:Pointer; ALength:Word):Word;
Description: Checksum the IP Header and Options on Send
Buffer Complete packet including Transport header


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