Ieee80211DataHeader¶

Namespace: inet

class Ieee80211DataHeader

Format of the 802.11 data frame

Usage diagram¶

Inheritance diagram¶

Extends¶

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

Fields¶

Name	Type	Description
id	int
mutable	bool
complete	bool
correct	bool
properlyRepresented	bool
chunkLength	b
rawBin	string[]
rawHex	string[]
regionTags	SharingRegionTagSet::TagBaseRegionTag[]
chunkLength
type	Ieee80211FrameType	type and subtype
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
chunkLength
transmitterAddress	MacAddress	aka address2 (TA)
chunkLength
address3	MacAddress
fragmentNumber	short
sequenceNumber	SequenceNumberCyclic
chunkLength		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.
type		or ST_DATA_WITH_QOS
address4	MacAddress	optional field, exists when toDS and fromDS are true
ackPolicy	AckPolicy
tid	uint8_t	optional field, exists when type == ST_DATA_WITH_QOS
aMsduPresent	bool	8.2.4.5.9 A-MSDU Present subfield

Properties¶

Name	Value	Description
beforeChange	handleChange()
descriptor	readonly
existingClass
packetData

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_t tid;              // optional field, exists when type == ST_DATA_WITH_QOS
    bool aMsduPresent = false; // 8.2.4.5.9 A-MSDU Present subfield
}

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