inet::Ipv4ProtocolDissector Class Reference

#include <Ipv4ProtocolDissector.h>

Inheritance diagram for inet::Ipv4ProtocolDissector:

Public Member Functions
virtual void	dissect (Packet *packet, const Protocol *protocol, ICallback &callback) const override
	Dissects the packet according to the protocol implemented by this ProtocolDissector. More...

Member Function Documentation

dissect()

void inet::Ipv4ProtocolDissector::dissect ( Packet *  packet, const Protocol *  protocol, ICallback &  callback  ) const

overridevirtual

Dissects the packet according to the protocol implemented by this ProtocolDissector.

Implements inet::ProtocolDissector.

{
    auto trailerPopOffset = packet->getBackOffset();
    auto ipv4EndOffset = packet->getFrontOffset();
    const auto& header = packet->popAtFront<Ipv4Header>();
    ipv4EndOffset += B(header->getTotalLengthField());
    callback.startProtocolDataUnit(&Protocol::ipv4);
    bool incorrect = (ipv4EndOffset > trailerPopOffset || header->getTotalLengthField() <= header->getHeaderLength());
    if (incorrect) {
        callback.markIncorrect();
        ipv4EndOffset = trailerPopOffset;
    }
    callback.visitChunk(header, &Protocol::ipv4);
    packet->setBackOffset(ipv4EndOffset);
    if (header->getFragmentOffset() == 0 && !header->getMoreFragments()) {
        callback.dissectPacket(packet, header->getProtocol());
    }
    else {
        // TODO Fragmentation
        callback.dissectPacket(packet, nullptr);
    }
    if (incorrect && packet->getDataLength() > b(0))
        callback.dissectPacket(packet, nullptr);
    ASSERT(incorrect || packet->getDataLength() == b(0));
    packet->setFrontOffset(ipv4EndOffset);
    packet->setBackOffset(trailerPopOffset);
    callback.endProtocolDataUnit(&Protocol::ipv4);
}

---

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

• Ipv4ProtocolDissector.h
• Ipv4ProtocolDissector.cc