Difference between revisions of "Unit ICMP"

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----
 
----
  
−
''To be documented''
+
'''Ultibo ICMP (Internet Control Message Protocol) unit'''
  
 
=== Constants ===
 
=== Constants ===
 
----
 
----
  
−
''To be documented''
+
 
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
 +
<div style="font-size: 14px; padding-left: 12px;">'''ICMP protocol''' <code> ICMP_PROTOCOL_* </code></div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
|colspan="2"|Note: Some ICMP definitions are in the Protocol or IP modules
 +
|-
 +
|colspan="2"|&nbsp;
 +
|-
 +
| <code>ICMP_PROTOCOL_NAME = 'ICMP';</code>
 +
| style="width: 50%;"|&nbsp;
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
 +
<div style="font-size: 14px; padding-left: 12px;">'''ICMP specific constants''' <code> ICMP_* </code></div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
| <code>ICMP_TIMEOUT = 0;</code>
 +
| Wait forever on a ICMP Read
 +
|-
 +
| <code>ICMP_BUFFER_SIZE = 65536;</code>
 +
| ICMP Receive Buffer Size
 +
|-
 +
|colspan="2"|&nbsp;
 +
|-
 +
| <code>ICMP_HEADER_SIZE = 8;</code>
 +
| SizeOf(TICMPHeader); ICMP.Solicit
 +
|-
 +
|colspan="2"|&nbsp;
 +
|-
 +
| <code>ICMP_PACKET_SIZE = 8;</code>
 +
| SizeOf(TICMPPacket)
 +
|-
 +
|colspan="2"|&nbsp;
 +
|-
 +
| <code>ICMP_ROUTER_TIMEOUT = 60000;</code>
 +
| &nbsp;
 +
|-
 +
|}
 +
</div></div>
 +
<br />
  
 
=== Type definitions ===
 
=== Type definitions ===
 
----
 
----
  
−
''To be documented''
 
  
 +
'''ICMP unused header'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPUnusedHeader = ^TICMPUnusedHeader;</code>
 +
 +
<code>TICMPUnusedHeader = packed record  {Unreachable, TimeExceeded, SourceQuench etc}</code>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
|colspan="2"|Note: Some ICMP definitions are in the Protocol or IP modules
 +
|-
 +
| <code>ICMPType:Byte;</code>
 +
| ICMP_UNREACH etc
 +
|-
 +
| <code>Code:Byte;</code>
 +
| ICMP_UNREACH_NET,ICMP_UNREACH_PORT etc
 +
|-
 +
| <code>Checksum:Word;</code>
 +
| 1s Compliment checksum of Structure
 +
|-
 +
| <code>Unused:LongWord;</code>
 +
| 4 Bytes Unused Must be Zero
 +
|-
 +
| <code>IP:TIPHeader;</code>
 +
| IP Header from Original IP Packet
 +
|-
 +
| <code>Data:array[0..7] of Byte;</code>
 +
| 8 Bytes of Original IP Packet Data
 +
|-
 +
|}
 +
</div></div>
 +
 +
'''ICMP unreach header'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPUnreachHeader = ^TICMPUnreachHeader;</code>
 +
 +
<code>TICMPUnreachHeader = TICMPUnusedHeader; </code>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
|colspan="2"|Note: ICMP_UNREACH
 +
|-
 +
| &nbsp;
 +
| style="width: 50%;"|&nbsp;
 +
|-
 +
|}
 +
</div></div>
 +
 +
'''ICMP expire header'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPExpireHeader = ^TICMPExpireHeader;</code>
 +
 +
<code>TICMPExpireHeader = TICMPUnusedHeader;</code>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
|colspan="2"|Note: ICMP_TIMXCEED
 +
|-
 +
| &nbsp;
 +
| style="width: 50%;"|&nbsp;
 +
|-
 +
|}
 +
</div></div>
 +
 +
'''ICMP quench header'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPQuenchHeader = ^TICMPQuenchHeader;</code>
 +
 +
<code>TICMPQuenchHeader = TICMPUnusedHeader;</code>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
|colspan="2"|Note: ICMP_SOURCEQUENCH
 +
|-
 +
| &nbsp;
 +
| style="width: 50%;"|&nbsp;
 +
|-
 +
|}
 +
</div></div>
 +
 +
'''ICMP pointer header'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPPointerHeader = ^TICMPPointerHeader;</code>
 +
 +
<code>TICMPPointerHeader = 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: Param Problem
 +
|-
 +
| <code>ICMPType:Byte;</code>
 +
| ICMP_PARAMPROB etc
 +
|-
 +
| <code>Code:Byte;</code>
 +
| ICMP_PARAMPROB_OPTABSENT etc
 +
|-
 +
| <code>Checksum:Word;</code>
 +
| 1s Compliment checksum of Structure
 +
|-
 +
| <code>Pointer:Byte;</code>
 +
| If Code = 0 Pointer to Byte where Error Occured
 +
|-
 +
| <code>Unused:array[0..2] of Byte;</code>
 +
| 3 Bytes Unused Must be Zero
 +
|-
 +
| <code>IP:TIPHeader;</code>
 +
| IP Header from Original IP Packet
 +
|-
 +
| <code>Data:array[0..7] of Byte;</code>
 +
| 8 Bytes of Original IP Packet Data
 +
|-
 +
|}
 +
</div></div> 
 +
 
 +
'''ICMP param header'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPParamHeader = ^TICMPParamHeader;</code>
 +
 +
<code>TICMPParamHeader = TICMPPointerHeader;</code>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
|colspan="2"|Note: ICMP_PARAMPROB
 +
|-
 +
| &nbsp;
 +
| style="width: 50%;"|&nbsp;
 +
|-
 +
|}
 +
</div></div>
 +
 +
'''ICMP IP header
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPIpHeader = ^TICMPIpHeader;</code>
 +
 +
<code>TICMPIpHeader = 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: Redirect
 +
|-
 +
| <code>ICMPType:Byte;</code>
 +
| ICMP_REDIRECT etc
 +
|-
 +
| <code>Code:Byte;</code>
 +
| ICMP_REDIRECT_NET,ICMP_REDIRECT_HOST etc
 +
|-
 +
| <code>Checksum:Word;</code>
 +
| 1s Compliment checksum of Structure
 +
|-
 +
| <code>Gateway:TInAddr;</code>
 +
| Redirect Gateway Address
 +
|-
 +
| <code>IP:TIPHeader;</code>
 +
| IP Header from Original IP Packet
 +
|-
 +
| <code>Data:array[0..7] of Byte;</code>
 +
| 8 Bytes of Original IP Packet Data
 +
|-
 +
|}
 +
</div></div> 
 +
 +
'''ICMP redirect header'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPRedirectHeader = ^TICMPRedirectHeader;</code>
 +
 +
<code>TICMPRedirectHeader = TICMPIpHeader</code>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
|colspan="2"|Note: ICMP_REDIRECT
 +
|-
 +
| &nbsp;
 +
| style="width: 50%;"|&nbsp;
 +
|-
 +
|}
 +
</div></div>
 +
 +
'''ICMP echo header'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPEchoHeader = ^TICMPEchoHeader;</code>
 +
 +
<code>TICMPEchoHeader = 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: Echo Request/Reply
 +
|-
 +
| <code>ICMPType:Byte;</code>
 +
| ICMP_ECHO,ICMP_ECHOREPLY
 +
|-
 +
| <code>Code:Byte;</code>
 +
| Always 0
 +
|-
 +
| <code>Checksum:Word;</code>
 +
| 1s Compliment checksum of Structure
 +
|-
 +
| <code>Identifier:Word;</code>
 +
| Increments with each ICMP_ECHO
 +
|-
 +
| <code>Sequence:Word;</code>
 +
| Sequence within an ICMP_ECHO set
 +
|-
 +
| <code>Data:array[0..((MAX_IP_PACKET - 1) - SizeOf(TIPHeader)) - 8] of Byte;</code>
 +
| &nbsp;
 +
|-
 +
|}
 +
</div></div> 
 +
 +
'''ICMP time stamp header'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPTimestampHeader = ^TICMPTimestampHeader;</code>
 +
 +
<code>TICMPTimestampHeader = 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: Timestamp Request/Reply
 +
|-
 +
| <code>ICMPType:Byte;</code>
 +
| ICMP_TSTAMP,ICMP_TSTAMPREPLY
 +
|-
 +
| <code>Code:Byte;</code>
 +
| Always 0
 +
|-
 +
| <code>Checksum:Word;</code>
 +
| 1s Compliment checksum of Structure
 +
|-
 +
| <code>Identifier:Word;</code>
 +
| Increments with each ICMP_TSTAMP
 +
|-
 +
| <code>Sequence:Word;</code>
 +
| Sequence within an ICMP_TSTAMP set
 +
|-
 +
| <code>Original:LongWord;</code>
 +
| Original Timestamp
 +
|-
 +
| <code>Receive:LongWord;</code>
 +
| Receive Timestamp
 +
|-
 +
| <code>Transmit:LongWord;</code>
 +
| Transmit Timestamp (A sort of Round Trip Time Echo)
 +
|-
 +
|}
 +
</div></div> 
 +
 +
'''ICMP info header'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPInfoHeader = ^TICMPInfoHeader;</code>
 +
 +
<code>TICMPInfoHeader = 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: Info Request/Reply
 +
|-
 +
| <code>ICMPType:Byte;</code>
 +
| ICMP_IREQ,ICMP_IREQREPLY
 +
|-
 +
| <code>Code:Byte;</code>
 +
| Always 0
 +
|-
 +
| <code>Checksum:Word;</code>
 +
| 1s Compliment checksum of Structure
 +
|-
 +
| <code>Identifier:Word;</code>
 +
| Increments with each ICMP_IREQ
 +
|-
 +
| <code>Sequence:Word;</code>
 +
| Sequence within an ICMP_IREQ set (Used to determine Network Number of Local Subnet)
 +
|-
 +
|}
 +
</div></div> 
 +
 +
'''ICMP mask header'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPMaskHeader = ^TICMPMaskHeader;</code>
 +
 +
<code>TICMPMaskHeader = 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: Mask Request/Reply
 +
|-
 +
| <code>ICMPType:Byte;</code>
 +
| ICMP_MASKREQ,ICMP_MASKREPLY
 +
|-
 +
| <code>Code:Byte;</code>
 +
| Always 0
 +
|-
 +
| <code>Checksum:Word;</code>
 +
| 1s Compliment checksum of Structure
 +
|-
 +
| <code>Identifier:Word;</code>
 +
| Increments with each ICMP_MASKREQ
 +
|-
 +
| <code>Sequence:Word;</code>
 +
| Sequence within an ICMP_MASKREQ set
 +
|-
 +
| <code>Mask:TInAddr;</code>
 +
| Subnet Mask of Local Subnet (Used to determine Subnet Mask of Local Subnet)
 +
|-
 +
|}
 +
</div></div> 
 +
 +
'''ICMP router address'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPRouterAddress = ^TICMPRouterAddress;</code>
 +
 +
<code>TICMPRouterAddress = packed record</code>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
| <code>Address:TInAddr;</code>
 +
| The address of the Router on this subnet
 +
|-
 +
| <code>Level:LongInt;</code>
 +
| The level of preference, higher is better
 +
|-
 +
|}
 +
</div></div> 
 +
 +
'''ICMP advert header'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPAdvertHeader = ^TICMPAdvertHeader;</code>
 +
 +
<code>TICMPAdvertHeader = packed record</code>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
| <code>ICMPType:Byte;</code>
 +
| ICMP_ROUTERADVERT
 +
|-
 +
| <code>Code:Byte;</code>
 +
| Always 0
 +
|-
 +
| <code>Checksum:Word;</code>
 +
| 1s Compliment checksum of Structure
 +
|-
 +
| <code>EntryCount:Byte;</code>
 +
| Number of Router Address entries
 +
|-
 +
| <code>EntrySize:Byte;</code>
 +
| Size of each Router Address entry
 +
|-
 +
| <code>Lifetime:Word;</code>
 +
| Lifetime of entries in seconds
 +
|-
 +
| <code>Routers:array[1..EntryCount] of TICMPRouterAddress;</code>
 +
| Used to advertise routers
 +
|-
 +
|}
 +
</div></div> 
 +
 +
'''ICMP solicit header'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPSolicitHeader = ^TICMPSolicitHeader;</code>
 +
 +
<code>TICMPSolicitHeader = packed record</code>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
| <code>ICMPType:Byte;</code>
 +
| ICMP_ROUTERSOLICIT
 +
|-
 +
| <code>Code:Byte;</code>
 +
| Always 0
 +
|-
 +
| <code>Checksum:Word;</code>
 +
| 1s Compliment checksum of Structure
 +
|-
 +
| <code>Reserved:LongWord;</code>
 +
| Always 0 (Used to solicit routers)
 +
|-
 +
|}
 +
</div></div> 
 +
 +
'''ICMP header'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPHeader = ^TICMPHeader;</code>
 +
 +
<code>TICMPHeader = packed record</code>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
| <code>case Integer of</code>
 +
| style="width: 50%;"|&nbsp;
 +
|-
 +
| <code>0:(Unused:TICMPUnusedHeader);</code>
 +
| &nbsp;
 +
|-
 +
| <code>1:(Unreach:TICMPUnreachHeader);</code>
 +
| &nbsp;
 +
|-
 +
| <code>2:(Expire:TICMPExpireHeader);</code>
 +
| &nbsp;
 +
|-
 +
| <code>3:(Quench:TICMPQuenchHeader);</code>
 +
| &nbsp;
 +
|-
 +
| <code>4:(Pointer:TICMPPointerHeader);</code>
 +
| &nbsp;
 +
|-
 +
| <code>5:(Param:TICMPParamHeader);</code>
 +
| &nbsp;
 +
|-
 +
| <code>6:(Ip:TICMPIpHeader);</code>
 +
| &nbsp;
 +
|-
 +
| <code>7:(Redirect:TICMPRedirectHeader);</code>
 +
| &nbsp;
 +
|-
 +
| <code>8:(Echo:TICMPEchoHeader);</code>
 +
| &nbsp;
 +
|-
 +
| <code>9:(Timestamp:TICMPTimestampHeader);</code>
 +
| &nbsp;
 +
|-
 +
| <code>10:(Info:TICMPInfoHeader);</code>
 +
| &nbsp;
 +
|-
 +
| <code>11:(Mask:TICMPMaskHeader);</code>
 +
| &nbsp;
 +
|-
 +
| <code>12:(Advert:TICMPAdvertHeader);</code>
 +
| &nbsp;
 +
|-
 +
| <code>13:(Solicit:TICMPSolicitHeader);</code>
 +
| &nbsp;
 +
|-
 +
|}
 +
</div></div> 
 +
 
 +
'''ICMP packet'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PICMPPacket = ^TICMPPacket;</code>
 +
 +
<code>TICMPPacket = 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: 8 Bytes (Used by ICMPBuffer)
 +
|-
 +
| <code>Size:LongWord;</code>
 +
| LongWord to keep size even
 +
|-
 +
| <code>Next:PICMPPacket;</code>
 +
| Followed by RemoteAddress (4 or 16 Bytes)
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
 +
=== Class definitions ===
 +
----
 +
 +
 +
'''ICMP specific classes'''
 +
 +
{| class="wikitable" style="font-size: 14px; text-align: left; width: 100%; height: 50px;"
 +
|-
 +
| [[TICMPProtocolTransport|<code>TICMPProtocolTransport = class(TProtocolTransport)</code>]]
 +
|-
 +
|}
 +
{| class="wikitable" style="font-size: 14px; text-align: left; width: 100%; height: 50px;"
 +
|-
 +
| [[TICMPProtocol|<code>TICMPProtocol = class(TNetworkProtocol)</code>]]
 +
|-
 +
|}
 +
{| class="wikitable" style="font-size: 14px; text-align: left; width: 100%; height: 50px;"
 +
|-
 +
| [[TICMPSocket|<code>TICMPSocket = class(TProtocolSocket)</code>]]
 +
|-
 +
|}
 +
{| class="wikitable" style="font-size: 14px; text-align: left; width: 100%; height: 50px;"
 +
|-
 +
| [[TICMPBuffer|<code>TICMPBuffer = class(TSocketBuffer)</code>]]
 +
|-
 +
|}
 +
<br />
 
=== Public variables ===
 
=== Public variables ===
 
----
 
----
  
−
''To be documented''
+
''None defined''
  
 
=== Function declarations ===
 
=== Function declarations ===
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<pre style="border: 0; padding-bottom:0px;">function ChecksumICMP(AFamily:Word; ABuffer:Pointer; AOffset,ALength:Word):Word;</pre>
 
<pre style="border: 0; padding-bottom:0px;">function ChecksumICMP(AFamily:Word; ABuffer:Pointer; AOffset,ALength:Word):Word;</pre>
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<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Checksum the ICMP Header on Send / Validate the Checksum on Receive</div>
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<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Checksum the ICMP Header on Send/Validate the Checksum on Receive</div>
 
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Latest revision as of 05:24, 31 August 2021

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Description

Ultibo ICMP (Internet Control Message Protocol) unit

Constants


ICMP protocol ICMP_PROTOCOL_*
Note: Some ICMP definitions are in the Protocol or IP modules
 
ICMP_PROTOCOL_NAME = 'ICMP';  


ICMP specific constants ICMP_*
ICMP_TIMEOUT = 0; Wait forever on a ICMP Read
ICMP_BUFFER_SIZE = 65536; ICMP Receive Buffer Size
 
ICMP_HEADER_SIZE = 8; SizeOf(TICMPHeader); ICMP.Solicit
 
ICMP_PACKET_SIZE = 8; SizeOf(TICMPPacket)
 
ICMP_ROUTER_TIMEOUT = 60000;  


Type definitions


ICMP unused header

PICMPUnusedHeader = ^TICMPUnusedHeader;

TICMPUnusedHeader = packed record {Unreachable, TimeExceeded, SourceQuench etc}

Note: Some ICMP definitions are in the Protocol or IP modules
ICMPType:Byte; ICMP_UNREACH etc
Code:Byte; ICMP_UNREACH_NET,ICMP_UNREACH_PORT etc
Checksum:Word; 1s Compliment checksum of Structure
Unused:LongWord; 4 Bytes Unused Must be Zero
IP:TIPHeader; IP Header from Original IP Packet
Data:array[0..7] of Byte; 8 Bytes of Original IP Packet Data

ICMP unreach header

PICMPUnreachHeader = ^TICMPUnreachHeader;

TICMPUnreachHeader = TICMPUnusedHeader;

Note: ICMP_UNREACH
   

ICMP expire header

PICMPExpireHeader = ^TICMPExpireHeader;

TICMPExpireHeader = TICMPUnusedHeader;

Note: ICMP_TIMXCEED
   

ICMP quench header

PICMPQuenchHeader = ^TICMPQuenchHeader;

TICMPQuenchHeader = TICMPUnusedHeader;

Note: ICMP_SOURCEQUENCH
   

ICMP pointer header

PICMPPointerHeader = ^TICMPPointerHeader;

TICMPPointerHeader = packed record

Note: Param Problem
ICMPType:Byte; ICMP_PARAMPROB etc
Code:Byte; ICMP_PARAMPROB_OPTABSENT etc
Checksum:Word; 1s Compliment checksum of Structure
Pointer:Byte; If Code = 0 Pointer to Byte where Error Occured
Unused:array[0..2] of Byte; 3 Bytes Unused Must be Zero
IP:TIPHeader; IP Header from Original IP Packet
Data:array[0..7] of Byte; 8 Bytes of Original IP Packet Data

ICMP param header

PICMPParamHeader = ^TICMPParamHeader;

TICMPParamHeader = TICMPPointerHeader;

Note: ICMP_PARAMPROB
   

ICMP IP header

PICMPIpHeader = ^TICMPIpHeader;

TICMPIpHeader = packed record

Note: Redirect
ICMPType:Byte; ICMP_REDIRECT etc
Code:Byte; ICMP_REDIRECT_NET,ICMP_REDIRECT_HOST etc
Checksum:Word; 1s Compliment checksum of Structure
Gateway:TInAddr; Redirect Gateway Address
IP:TIPHeader; IP Header from Original IP Packet
Data:array[0..7] of Byte; 8 Bytes of Original IP Packet Data

ICMP redirect header

PICMPRedirectHeader = ^TICMPRedirectHeader;

TICMPRedirectHeader = TICMPIpHeader

Note: ICMP_REDIRECT
   

ICMP echo header

PICMPEchoHeader = ^TICMPEchoHeader;

TICMPEchoHeader = packed record

Note: Echo Request/Reply
ICMPType:Byte; ICMP_ECHO,ICMP_ECHOREPLY
Code:Byte; Always 0
Checksum:Word; 1s Compliment checksum of Structure
Identifier:Word; Increments with each ICMP_ECHO
Sequence:Word; Sequence within an ICMP_ECHO set
Data:array[0..((MAX_IP_PACKET - 1) - SizeOf(TIPHeader)) - 8] of Byte;  

ICMP time stamp header

PICMPTimestampHeader = ^TICMPTimestampHeader;

TICMPTimestampHeader = packed record

Note: Timestamp Request/Reply
ICMPType:Byte; ICMP_TSTAMP,ICMP_TSTAMPREPLY
Code:Byte; Always 0
Checksum:Word; 1s Compliment checksum of Structure
Identifier:Word; Increments with each ICMP_TSTAMP
Sequence:Word; Sequence within an ICMP_TSTAMP set
Original:LongWord; Original Timestamp
Receive:LongWord; Receive Timestamp
Transmit:LongWord; Transmit Timestamp (A sort of Round Trip Time Echo)

ICMP info header

PICMPInfoHeader = ^TICMPInfoHeader;

TICMPInfoHeader = packed record

Note: Info Request/Reply
ICMPType:Byte; ICMP_IREQ,ICMP_IREQREPLY
Code:Byte; Always 0
Checksum:Word; 1s Compliment checksum of Structure
Identifier:Word; Increments with each ICMP_IREQ
Sequence:Word; Sequence within an ICMP_IREQ set (Used to determine Network Number of Local Subnet)

ICMP mask header

PICMPMaskHeader = ^TICMPMaskHeader;

TICMPMaskHeader = packed record

Note: Mask Request/Reply
ICMPType:Byte; ICMP_MASKREQ,ICMP_MASKREPLY
Code:Byte; Always 0
Checksum:Word; 1s Compliment checksum of Structure
Identifier:Word; Increments with each ICMP_MASKREQ
Sequence:Word; Sequence within an ICMP_MASKREQ set
Mask:TInAddr; Subnet Mask of Local Subnet (Used to determine Subnet Mask of Local Subnet)

ICMP router address

PICMPRouterAddress = ^TICMPRouterAddress;

TICMPRouterAddress = packed record

Address:TInAddr; The address of the Router on this subnet
Level:LongInt; The level of preference, higher is better

ICMP advert header

PICMPAdvertHeader = ^TICMPAdvertHeader;

TICMPAdvertHeader = packed record

ICMPType:Byte; ICMP_ROUTERADVERT
Code:Byte; Always 0
Checksum:Word; 1s Compliment checksum of Structure
EntryCount:Byte; Number of Router Address entries
EntrySize:Byte; Size of each Router Address entry
Lifetime:Word; Lifetime of entries in seconds
Routers:array[1..EntryCount] of TICMPRouterAddress; Used to advertise routers

ICMP solicit header

PICMPSolicitHeader = ^TICMPSolicitHeader;

TICMPSolicitHeader = packed record

ICMPType:Byte; ICMP_ROUTERSOLICIT
Code:Byte; Always 0
Checksum:Word; 1s Compliment checksum of Structure
Reserved:LongWord; Always 0 (Used to solicit routers)

ICMP header

PICMPHeader = ^TICMPHeader;

TICMPHeader = packed record

case Integer of  
0:(Unused:TICMPUnusedHeader);  
1:(Unreach:TICMPUnreachHeader);  
2:(Expire:TICMPExpireHeader);  
3:(Quench:TICMPQuenchHeader);  
4:(Pointer:TICMPPointerHeader);  
5:(Param:TICMPParamHeader);  
6:(Ip:TICMPIpHeader);  
7:(Redirect:TICMPRedirectHeader);  
8:(Echo:TICMPEchoHeader);  
9:(Timestamp:TICMPTimestampHeader);  
10:(Info:TICMPInfoHeader);  
11:(Mask:TICMPMaskHeader);  
12:(Advert:TICMPAdvertHeader);  
13:(Solicit:TICMPSolicitHeader);  

ICMP packet

PICMPPacket = ^TICMPPacket;

TICMPPacket = record

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


Class definitions


ICMP specific classes

TICMPProtocolTransport = class(TProtocolTransport)
TICMPProtocol = class(TNetworkProtocol)
TICMPSocket = class(TProtocolSocket)
TICMPBuffer = class(TSocketBuffer)


Public variables

None defined

Function declarations


Initialization functions 

procedure ICMPInit;
Description: To be documented
Note None documented


ICMP functions 

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


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


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


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


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


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


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