inet::ieee80211::MsduDeaggregation Class Reference

#include <MsduDeaggregation.h>

Inheritance diagram for inet::ieee80211::MsduDeaggregation:

Public Member Functions
virtual std::vector< Packet * > *	deaggregateFrame (Packet *frame) override
Public Member Functions inherited from inet::ieee80211::IMsduDeaggregation
virtual	~IMsduDeaggregation ()

Protected Member Functions
virtual void	setExplodedFrameAddress (const Ptr< Ieee80211DataHeader > &header, const Ptr< const Ieee80211MsduSubframeHeader > &subframe, const Ptr< const Ieee80211DataHeader > &aMsduHeader)

Member Function Documentation

deaggregateFrame()

std::vector< Packet * > * inet::ieee80211::MsduDeaggregation::deaggregateFrame ( Packet *  frame )

overridevirtual

Implements inet::ieee80211::IMsduDeaggregation.

{
    EV_DEBUG << "Deaggregating A-MSDU " << *aggregatedFrame << " into multiple packets.\n";
    std::vector<Packet *> *frames = new std::vector<Packet *>();
    const auto& amsduHeader = aggregatedFrame->popAtFront<Ieee80211DataHeader>();
    aggregatedFrame->popAtBack<Ieee80211MacTrailer>(B(4));
    int tid = amsduHeader->getTid();
    int paddingLength = 0;
    cStringTokenizer tokenizer(aggregatedFrame->getName(), "+");
    while (aggregatedFrame->getDataLength() > b(0)) {
        aggregatedFrame->setFrontOffset(aggregatedFrame->getFrontOffset() + B(paddingLength == 4 ? 0 : paddingLength));
        const auto& msduSubframeHeader = aggregatedFrame->popAtFront<Ieee80211MsduSubframeHeader>();
        const auto& msdu = aggregatedFrame->peekDataAt(b(0), B(msduSubframeHeader->getLength()));
        paddingLength = 4 - B(msduSubframeHeader->getChunkLength() + msdu->getChunkLength()).get() % 4;
        aggregatedFrame->setFrontOffset(aggregatedFrame->getFrontOffset() + msdu->getChunkLength());
        auto frame = new Packet();
        frame->setName(tokenizer.nextToken());
        frame->insertAtBack(msdu);
        auto header = makeShared<Ieee80211DataHeader>();
        header->setType(ST_DATA_WITH_QOS);
        header->addChunkLength(QOSCONTROL_PART_LENGTH);
        header->setToDS(amsduHeader->getToDS());
        header->setFromDS(amsduHeader->getFromDS());
        header->setTid(tid);
        header->setSequenceNumber(SequenceNumberCyclic(0));
        setExplodedFrameAddress(header, msduSubframeHeader, amsduHeader);
        frame->insertAtFront(header);
        frame->insertAtBack(makeShared<Ieee80211MacTrailer>());
        EV_TRACE << "Created " << *frame << " from A-MSDU.\n";
        frames->push_back(frame);
    }
    delete aggregatedFrame;
    EV_TRACE << "Created " << frames->size() << " packets from A-MSDU.\n";
    return frames;
}

setExplodedFrameAddress()

void inet::ieee80211::MsduDeaggregation::setExplodedFrameAddress ( const Ptr< Ieee80211DataHeader > &  header, const Ptr< const Ieee80211MsduSubframeHeader > &  subframe, const Ptr< const Ieee80211DataHeader > &  aMsduHeader  )

protectedvirtual

{
    bool toDS = aMsduHeader->getToDS();
    bool fromDS = aMsduHeader->getFromDS();
    if (fromDS == 0 && toDS == 0) { // STA to STA
        header->setTransmitterAddress(aMsduHeader->getTransmitterAddress());
        header->setReceiverAddress(aMsduHeader->getReceiverAddress());
    }
    else if (fromDS == 1 && toDS == 0) { // AP to STA
        header->setTransmitterAddress(aMsduHeader->getTransmitterAddress());
        header->setReceiverAddress(subframeHeader->getDa());
        header->setAddress3(subframeHeader->getSa());
    }
    else if (fromDS == 0 && toDS == 1) { // STA to AP
        header->setTransmitterAddress(subframeHeader->getSa());
        header->setReceiverAddress(aMsduHeader->getReceiverAddress());
        header->setAddress3(subframeHeader->getDa());
    }
    else if (fromDS == 1 && toDS == 1) { // AP to AP
        header->setReceiverAddress(aMsduHeader->getReceiverAddress());
        header->setTransmitterAddress(aMsduHeader->getTransmitterAddress());
        header->setAddress3(subframeHeader->getDa());
        header->setAddress4(subframeHeader->getSa());
    }
    ASSERT(!header->getReceiverAddress().isUnspecified());
    ASSERT(!header->getTransmitterAddress().isUnspecified());
}

Referenced by deaggregateFrame().

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The documentation for this class was generated from the following files:

• MsduDeaggregation.h
• MsduDeaggregation.cc