Ieee80211DataHeader

class

Format of the 802.11 data frame

Usage diagram

The following diagram shows usage relationships between types. Unresolved types are missing from the diagram.

Inheritance diagram

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram.

Extends

Name	Type	Description
Ieee80211DataOrMgmtHeader	class	Common base class for 802.11 data and management frames

Fields

Name	Type	Description
chunkLength	b
type	Ieee80211FrameType	type and subtype
address4	MacAddress	optional field, exists when toDS and fromDS are true
ackPolicy	AckPolicy
tid	uint8	optional field, exists when type == ST_DATA_WITH_QOS
aMsduPresent	bool	8.2.4.5.9 A-MSDU Present subfield
address3	MacAddress
fragmentNumber	short
sequenceNumber	SequenceNumber
transmitterAddress	MacAddress	aka address2 (TA)
toDS	bool
fromDS	bool
moreFragments	bool
retry	bool
powerMgmt	bool	unused
moreData	bool	unused
protectedFrame	bool	unused
order	bool	unused
durationField	simtime_t	"duration" in the Duration/ID field (-1=no duration)
AID	short	"id" (Association ID) in the Duration/ID field (-1=no ID)
receiverAddress	MacAddress	aka address1 (RA)
MACArrive	simtime_t	FIXME remove it, technical data, used inside of MAC module
mutable	bool
complete	bool
correct	bool
properlyRepresented	bool
rawBin	string[]
rawHex	string[]
tags	RegionTagSet::cObjectRegionTag[]

Source code

//
// Format of the 802.11 data frame
//
class Ieee80211DataHeader extends Ieee80211DataOrMgmtHeader
{
    //  The presence of the Address 4 field is determined by the setting of the To DS and From DS subfields of
    //  the Frame Control field (see below). The QoS Control field is present when the QoS subfield of the Subtype
    //  field is set to 1 (8.3.2.1 Data frame format)
    //  FIXME: chunkLength is not a constant value DATAFRAME_HEADER_MINLENGTH (24 bytes).
    //  For example, with Address 4 and without QoS the correct length is 30 bytes.
    //  Without Address 4 and QoS the correct value is indeed 24 bytes.
    //  With Address 4 and QoS the correct value is indeed 32 bytes.
    chunkLength = DATAFRAME_HEADER_MINLENGTH;
    type = ST_DATA;         // or ST_DATA_WITH_QOS
    MacAddress address4;    // optional field, exists when toDS and fromDS are true
    AckPolicy ackPolicy = NORMAL_ACK;
    uint8 tid;              // optional field, exists when type == ST_DATA_WITH_QOS
    bool aMsduPresent = false; // 8.2.4.5.9 A-MSDU Present subfield
}

//TODO this can be introduced when the SNAP header 
//class Ieee80211QoSDataHeader extends Ieee80211DataHeader
//{
//    type = ST_DATA_WITH_QOS;
//    chunkLength = DATAFRAME_HEADER_MINLENGTH + QOSCONTROL_PART_LENGTH;
//    AckPolicy ackPolicy = NORMAL_ACK; //FIXME in real life this is part of the optional qos field above...
//    uint8 tid;
//    // TODO: other QoS control field parts
//}

File: src/inet/linklayer/ieee80211/mac/Ieee80211Frame.msg