Ieee8022LlcSnapHeader¶

Namespace: inet

class Ieee8022LlcSnapHeader

This chunk represents an IEEE 802.2 LLC header with SNAP extension as defined by the section 9.2.4 OUI Extended EtherType of the IEEE Std 802-2014, IEEE Standard for Local and Metropolitan Area Networks: Overview and Architecture.

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

| DSAP | SSAP | CONTROL | OUI | +—————+—————+—————+—————+ | OUI | PROTOCOLID | +——————————-+——————————-+

Inheritance diagram¶

Extends¶

Name	Type	Description
Ieee8022LlcHeader	class	This chunk represents an IEEE 802.2 LLC header as defined by the ANSI/IEEE Std 802.2, 1998, IEEE Standard for Information technology, Telecommunications and information exchange between systems, Local and metropolitan area networks.

Fields¶

Name	Type	Description
id	int
mutable	bool
complete	bool
correct	bool
properlyRepresented	bool
chunkLength	b
rawBin	string[]
rawHex	string[]
regionTags	SharingRegionTagSet::TagBaseRegionTag[]
chunkLength
dsap	short	1 byte
ssap	short	1 byte
control	int	1 or 2 byte, control = byte[0]+256*byte[1], two bytes, when (byte[0] & 3) != 3
chunkLength
dsap
ssap
control
oui	int	organizationally unique identifier (OUI); 0 for protocols that have an EtherType (ARP, IPv4, IPv6, etc.), 3 bytes
protocolId	int	protocol identifier (PID); stores EtherType if orgCode is 0, 2 bytes

Properties¶

Name	Value	Description
beforeChange	handleChange()
descriptor	readonly
existingClass
packetData

Source code¶

//
// This chunk represents an IEEE 802.2 LLC header with SNAP extension as defined
// by the section 9.2.4 OUI Extended EtherType of the IEEE Std 802-2014, IEEE
// Standard for Local and Metropolitan Area Networks: Overview and Architecture.
//
//  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
// +---------------+---------------+---------------+---------------+
// |      DSAP     |      SSAP     |    CONTROL    |      OUI      |
// +---------------+---------------+---------------+---------------+
// |              OUI              |           PROTOCOLID          |
// +-------------------------------+-------------------------------+
//
class Ieee8022LlcSnapHeader extends Ieee8022LlcHeader
{
    chunkLength = B(8);
    dsap = 0xAA;
    ssap = 0xAA;
    control = 0x03;
    int oui = -1;   // organizationally unique identifier (OUI); 0 for protocols that have an EtherType (ARP, IPv4, IPv6, etc.), 3 bytes
    int protocolId = -1; // protocol identifier (PID); stores ~EtherType if orgCode is 0, 2 bytes
}

File: src/inet/linklayer/ieee8022/Ieee8022SnapHeader.msg