Ieee8022LlcSnapHeader

class

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

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the 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
chunkLength	b
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
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
id	int
mutable	bool
complete	bool
correct	bool
properlyRepresented	bool
rawBin	string[]
rawHex	string[]
regionTags	SharingRegionTagSet::TagBaseRegionTag[]

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