Namespace inet

EthernetFcs

class

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 | +---------------------------------------------------------------+

Extends

Name	Type	Description
FieldsChunk	(unknown -- not in documented files)

Fields

Name	Type	Description
chunkLength
fcs	uint32_t	actual value may be omitted depending on the selected fcsMode
fcsMode	FcsMode	meta information, not represented directly in the frame

Packet operations (observed)

action	module
insertAtBack	EthernetCsmaMac, EthernetEncapsulation, EthernetMac, EthernetFcsInserter, Ieee80211Portal
peekAtBack	EthernetCsmaMac, EthernetMac, EthernetFcsChecker
popAtBack	PcapRecorder, EthernetEncapsulation, EthernetCutthroughSource, EthernetFcsChecker, Ieee80211Portal, MultiFieldClassifier, StreamThroughReceiver
removeAtBack	EthernetCsmaMac, EthernetMac

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

    FcsMode fcsMode = FCS_MODE_UNDEFINED; // meta information, not represented directly in the frame
}

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