stru_NetSim_ICMP_DestinationUnreachableMessage Struct Reference

#include <ICMP.h>

Data Fields
char	Type
char	code
unsigned short int	Checksum
unsigned int	unused
void *	InternetHeader

Detailed Description

 As per RFC 792 page 3  :
 Destination Unreachable Message
 
 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|     Type      |     Code      |          Checksum             |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                             unused                            |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|      Internet Header + 64 bits of Original Data Datagram      |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Definition at line 60 of file ICMP.h.

Field Documentation

Checksum

unsigned short int stru_NetSim_ICMP_DestinationUnreachableMessage::Checksum

The checksum is the 16-bit ones's complement of the one's complement sum of the ICMP message starting with the ICMP Type. For computing the checksum , the checksum field should be zero. This checksum may be replaced in the future.

Definition at line 73 of file ICMP.h.

code

char stru_NetSim_ICMP_DestinationUnreachableMessage::code

0 = net unreachable;
1 = host unreachable;
2 = protocol unreachable;
3 = port unreachable;
4 = fragmentation needed and DF set;
5 = source route failed.

Definition at line 63 of file ICMP.h.

InternetHeader

void* stru_NetSim_ICMP_DestinationUnreachableMessage::InternetHeader

The internet header plus the first 64 bits of the original datagram's data. This data is used by the host to match the message to the appropriate process. If a higher level protocol uses port numbers, they are assumed to be in the first 64 data bits of the original datagram's data.

Definition at line 80 of file ICMP.h.

Type

char stru_NetSim_ICMP_DestinationUnreachableMessage::Type

Definition at line 62 of file ICMP.h.

unused

unsigned int stru_NetSim_ICMP_DestinationUnreachableMessage::unused

Definition at line 79 of file ICMP.h.

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The documentation for this struct was generated from the following file:

• ICMP.h