Namespace inet

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

Extends

Name	Type	Description
Ieee8022LlcHeader	(unknown -- not in documented files)

Fields

Name	Type	Description
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

Packet operations (observed)

action	module
insertAtFront	Ieee80211LlcLpd, Ieee80211Portal

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