EthernetFcs¶

Namespace: inet

class EthernetFcs

This class represents an Ethernet FCS as defined in the section 3.2.9 Frame Check Sequence (FCS) field of the IEEE Std 802.3-2018, IEEE Standard for Ethernet.

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

| FCS | +—————————————————————+

Usage diagram¶

Inheritance diagram¶

Extends¶

Name	Type	Description
FieldsChunk	class	(no description)

Known subclasses¶

Name	Type	Description
EthernetFragmentFcs	class	This class represents an Ethernet fragment FCS as defined in the section 3.2.9 Frame Check Sequence (FCS) field of the IEEE Std 802.3-2018, IEEE Standard for Ethernet.

Fields¶

Name	Type	Description
id	int
mutable	bool
complete	bool
correct	bool
properlyRepresented	bool
chunkLength	b
rawBin	string[]
rawHex	string[]
regionTags	SharingRegionTagSet::TagBaseRegionTag[]
chunkLength
fcs	uint32_t	actual value may be omitted depending on the selected fcsMode
fcsMode	ChecksumMode	meta information, not represented directly in the frame; NOTE: should be FcsMode, but OMMeT++ bug #1351 prevents that (fixed in OMNeT++ 6.2)

Properties¶

Name	Value	Description
beforeChange	handleChange()
descriptor	readonly
existingClass
packetData

Source code¶

//
// This class represents an Ethernet FCS as defined in the section 3.2.9 Frame
// Check Sequence (FCS) field of the IEEE Std 802.3-2018, IEEE Standard for
// Ethernet.
//
//  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
// +---------------------------------------------------------------+
// |                              FCS                              |
// +---------------------------------------------------------------+
//
class EthernetFcs extends FieldsChunk
{
    chunkLength = B(4);
    uint32_t fcs; // actual value may be omitted depending on the selected fcsMode

    ChecksumMode fcsMode = FCS_MODE_UNDEFINED; // meta information, not represented directly in the frame; NOTE: should be FcsMode, but OMMeT++ bug #1351 prevents that (fixed in OMNeT++ 6.2)
}

File: src/inet/linklayer/ethernet/common/EthernetMacHeader.msg