Msg File src/inet/linklayer/ieee8022/Ieee8022LlcHeader.msg

Name	Type	Description
Ieee8022LlcHeader	class	ieee 802.2 LLC header
Ieee8022LlcSnapHeader	class	ieee 802.2 LLC header with SNAP extension TODO rename to LlcWithSnap, or let separated Llc and Snap headers

Source code

//
// Copyright (C) OpenSim Ltd.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program; if not, see <http://www.gnu.org/licenses/>.
//

import inet.common.INETDefs;
import inet.common.packet.chunk.Chunk;

namespace inet;

// ieee 802.2 LLC header
class Ieee8022LlcHeader extends FieldsChunk
{
    chunkLength = B(3);
    short dsap = -1;    // 1 byte
    short ssap = -1;    // 1 byte
    int control = -1;    // 1 or 2 byte, control = byte[0]+256*byte[1], two bytes, when (byte[0] & 3) != 3
}

// ieee 802.2 LLC header with SNAP extension
//TODO rename to LlcWithSnap, or let separated Llc and Snap headers
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
}