inet::UdpCrcInsertionHook Class Reference

#include <Udp.h>

Inheritance diagram for inet::UdpCrcInsertionHook:

Public Member Functions
virtual Result	datagramPreRoutingHook (Packet *packet) override
	This is the first hook called by the network protocol before it routes a datagram that was received from the lower layer. More...
virtual Result	datagramForwardHook (Packet *packet) override
	This is the second hook called by the network protocol before it sends a datagram to the lower layer. More...
virtual Result	datagramPostRoutingHook (Packet *packet) override
	This is the last hook called by the network protocol before it sends a datagram to the lower layer. More...
virtual Result	datagramLocalInHook (Packet *packet) override
	This is the last hook called by the network protocol before it sends a datagram to the upper layer. More...
virtual Result	datagramLocalOutHook (Packet *packet) override
	This is the first hook called by the network protocol before it routes a datagram that was received from the upper layer. More...
Public Member Functions inherited from inet::NetfilterBase::HookBase
virtual	~HookBase ()
void	registeredTo (INetfilter *nf)
void	unregisteredFrom (INetfilter *nf)
bool	isRegisteredHook (INetfilter *nf)
Public Member Functions inherited from inet::INetfilter::IHook
virtual	~IHook ()

Additional Inherited Members
Public Types inherited from inet::INetfilter::IHook
enum	Type {   PREROUTING, LOCALIN, FORWARD, POSTROUTING,   LOCALOUT }
enum	Result { ACCEPT, DROP, QUEUE, STOLEN }
Protected Attributes inherited from inet::NetfilterBase::HookBase
std::vector< INetfilter * >	netfilters

Member Function Documentation

datagramForwardHook()

virtual Result inet::UdpCrcInsertionHook::datagramForwardHook ( Packet *  datagram )

inlineoverridevirtual

This is the second hook called by the network protocol before it sends a datagram to the lower layer.

This is done after the datagramPreRoutingHook or the datagramLocalInHook is called and the datagram is routed.

Implements inet::INetfilter::IHook.

{ return ACCEPT; }

datagramLocalInHook()

virtual Result inet::UdpCrcInsertionHook::datagramLocalInHook ( Packet *  datagram )

inlineoverridevirtual

This is the last hook called by the network protocol before it sends a datagram to the upper layer.

This is done after the datagramPreRoutingHook is called and the datagram is routed.

Implements inet::INetfilter::IHook.

{ return ACCEPT; }

datagramLocalOutHook()

virtual Result inet::UdpCrcInsertionHook::datagramLocalOutHook ( Packet *  datagram )

inlineoverridevirtual

This is the first hook called by the network protocol before it routes a datagram that was received from the upper layer.

The nextHopAddress is ignored when the outputNetworkInterface is a nullptr. After this is done

Implements inet::INetfilter::IHook.

{ return ACCEPT; }

datagramPostRoutingHook()

INetfilter::IHook::Result inet::UdpCrcInsertionHook::datagramPostRoutingHook ( Packet *  datagram )

overridevirtual

This is the last hook called by the network protocol before it sends a datagram to the lower layer.

Implements inet::INetfilter::IHook.

{
    Enter_Method("datagramPostRoutingHook");
 
    if (packet->findTag<InterfaceInd>())
        return ACCEPT; // FORWARD
 
    auto networkProtocol = packet->getTag<PacketProtocolTag>()->getProtocol();
    const auto& networkHeader = getNetworkProtocolHeader(packet);
    if (networkHeader->getProtocol() == &Protocol::udp) {
        ASSERT(!networkHeader->isFragment());
        packet->eraseAtFront(networkHeader->getChunkLength());
        auto udpHeader = packet->removeAtFront<UdpHeader>();
        ASSERT(udpHeader->getCrcMode() == CRC_COMPUTED);
        const L3Address& srcAddress = networkHeader->getSourceAddress();
        const L3Address& destAddress = networkHeader->getDestinationAddress();
        Udp::insertCrc(networkProtocol, srcAddress, destAddress, udpHeader, packet);
        packet->insertAtFront(udpHeader);
        packet->insertAtFront(networkHeader);
    }
 
    return ACCEPT;
}

datagramPreRoutingHook()

virtual Result inet::UdpCrcInsertionHook::datagramPreRoutingHook ( Packet *  datagram )

inlineoverridevirtual

This is the first hook called by the network protocol before it routes a datagram that was received from the lower layer.

The nextHopAddress is ignored when the outputNetworkInterface is nullptr.

Implements inet::INetfilter::IHook.

{ return ACCEPT; }

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

• Udp.h
• Udp.cc