Difference between revisions of "Unit IGMP"
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| − | '' | + | |
| + | '''IGMP header''' | ||
| + | |||
| + | <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;"> | ||
| + | <code>PIGMPHeader = ^TIGMPHeader;</code> | ||
| + | |||
| + | <code>TIGMPHeader = packed record</code> | ||
| + | <div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;"> | ||
| + | {| class="wikitable" style="font-size: 14px; background: white;" | ||
| + | |- | ||
| + | Note: Some IGMP definitions are in the Protocol or IP modules | ||
| + | |- | ||
| + | | <code>IGMPType:Byte;</code> | ||
| + | | type of IGMP message | ||
| + | |- | ||
| + | | <code>RespTime:Byte;</code> | ||
| + | | Query only otherwise 0 (Always zero in Version 1 (Assume 100)) | ||
| + | |- | ||
| + | | <code>Checksum:Word;</code> | ||
| + | | 1s Compliment IP-style checksum | ||
| + | |- | ||
| + | | <code>Address:TInAddr;</code> | ||
| + | | group address being reported or queried (zero for "General" queries) | ||
| + | |- | ||
| + | |} | ||
| + | </div></div> | ||
| + | |||
| + | '''IGMP packet''' | ||
| + | |||
| + | <div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;"> | ||
| + | <code>PIGMPPacket = ^TIGMPPacket;</code> | ||
| + | |||
| + | <code>TIGMPPacket = 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 IGMPBuffer) | ||
| + | |- | ||
| + | | <code>Size:LongWord;</code> | ||
| + | | LongWord to keep size even | ||
| + | |- | ||
| + | | <code>Next:PIGMPPacket;</code> | ||
| + | | Followed by RemoteAddress (4 or 16 Bytes) | ||
| + | |- | ||
| + | |} | ||
| + | </div></div> | ||
| + | <br /> | ||
=== Class definitions === | === Class definitions === | ||
Revision as of 00:38, 20 January 2017
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Contents
Description
Ultibo IGMP (Internet Group Management Protocol) unit
To be documented
Constants
IGMP specific constants
IGMP_PROTOCOL_* | Note: Some IGMP definitions are in the Protocol or IP modules | |
IGMP_PROTOCOL_NAME = 'IGMP';
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IGMP constants
IGMP_* IGMP_TIMEOUT = 0;
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Wait forever on a IGMP Read |
IGMP_BUFFER_SIZE = 65536;
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IGMP Receive Buffer Size |
IGMP_HEADER_SIZE = 8;
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SizeOf(TIGMPHeader); |
IGMP_PACKET_SIZE = 8;
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SizeOf(TIGMPPacket) |
IGMP_QUERY_TIMEOUT = 5000;
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IGMP_REPORT_TIMEOUT = 5000;
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IGMP_TRANSMIT_COUNT = 3;
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Type definitions
IGMP header
PIGMPHeader = ^TIGMPHeader;
TIGMPHeader = packed record
IGMPType:Byte;
|
type of IGMP message |
RespTime:Byte;
|
Query only otherwise 0 (Always zero in Version 1 (Assume 100)) |
Checksum:Word;
|
1s Compliment IP-style checksum |
Address:TInAddr;
|
group address being reported or queried (zero for "General" queries) |
IGMP packet
PIGMPPacket = ^TIGMPPacket;
TIGMPPacket = record
| Note: 8 Bytes (Used by IGMPBuffer) | |
Size:LongWord;
|
LongWord to keep size even |
Next:PIGMPPacket;
|
Followed by RemoteAddress (4 or 16 Bytes) |
Class definitions
To be documented
Public variables
None defined
Function declarations
Initialization functions
procedure IGMPInit;
Description: To be documented
| Note | None documented |
|---|
IGMP functions
function CheckIGMP(AFamily:Word; ABuffer:Pointer):Boolean;
Description: Verify that the packet is a valid IGMP packet
| Buffer | The complete packet including Transport header |
|---|
function GetIGMPHeaderOffset(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer | The complete packet including Transport header |
|---|
function GetIGMPHeaderLength(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer | The complete packet including Transport header |
|---|
function GetIGMPDataOffset(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer | The complete packet including Transport header |
|---|
function GetIGMPDataLength(AFamily:Word; ABuffer:Pointer):Word;
Description: To be documented
| Buffer | The complete packet including Transport header |
|---|
function ChecksumIGMP(AFamily:Word; ABuffer:Pointer; AOffset,ALength:Word):Word;
Description: Checksum the IGMP Header on Send / Validate the Checksum on Receive
| Note | Checksum is calculated on the whole packet (Header and Data) |
|---|
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