This module provides a network layer for the next hop forwarding.

Usage diagram

The following diagram shows usage relationships between types. Unresolved types are missing from the diagram.

Inheritance diagram

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram.

Parameters

Name	Type	Default value	Description
forwarding	bool	false
multicastForwarding	bool	false
interfaceTableModule	string

Properties

Name	Value	Description
display	i=block/fork

Gates

Name	Direction	Size	Description
ifIn	input
ifOut	output
transportIn	input
transportOut	output

Unassigned submodule parameters

Name	Type	Default value	Description
routingTable.interfaceTableModule	string		The path to the InterfaceTable module
routingTable.addressType	string	"modulepath"
routingTable.routerId	string	"auto"	for routers, the router id using address dotted notation; specify "auto" to select the highest interface address; should be left empty ("") for hosts
routingTable.forwarding	bool	true	turns IP forwarding on/off
routingTable.multicastForwarding	bool	false	turns multicast forwarding on/off
up.displayStringTextFormat	string	"processed %p pk (%l)"	determines the text that is written on top of the submodule
up.forwardServiceRegistration	bool	true
up.forwardProtocolRegistration	bool	true
arp.interfaceTableModule	string		path to the InterfaceTable module
arp.addressType	string	"ipv4"
nextHop.interfaceTableModule	string		The path to the InterfaceTable module
nextHop.routingTableModule	string
nextHop.arpModule	string
nextHop.procDelay	double	0s
nextHop.hopLimit	int	32
nextHop.headerLength	int	10B
lp.displayStringTextFormat	string	"processed %p pk (%l)"	determines the text that is written on top of the submodule
lp.forwardServiceRegistration	bool	true
lp.forwardProtocolRegistration	bool	true

Source code

//
// This module provides a network layer for the next hop forwarding.
//
module NextHopNetworkLayer like INetworkLayer
{
    parameters:
        bool forwarding = default(false);
        bool multicastForwarding = default(false);
        string interfaceTableModule;
        *.forwarding = this.forwarding;
        *.multicastForwarding = this.multicastForwarding;
        *.interfaceTableModule = default(absPath(this.interfaceTableModule));
        *.routingTableModule = default(absPath(".routingTable"));
        *.arpModule = default(absPath(".arp"));
        @display("i=block/fork");
    gates:
        input ifIn @labels(INetworkHeader);
        output ifOut @labels(INetworkHeader);
        input transportIn @labels(Ipv4ControlInfo/down);
        output transportOut @labels(Ipv4ControlInfo/up);

    submodules:
        routingTable: NextHopRoutingTable {
            parameters:
                @display("p=100,100;is=s");
        }
        echo: EchoProtocol {
            parameters:
                @display("p=600,100");
        }
        up: MessageDispatcher {
            parameters:
                @display("p=450,200;b=480,5");
        }
        arp: GlobalArp {
            parameters:
                @display("p=300,300;q=pendingQueue");
        }
        nextHop: NextHopForwarding {
            parameters:
                @display("p=600,300;q=queue");
        }
        lp: MessageDispatcher {
            parameters:
                @display("p=450,400;b=480,5");
        }

    connections allowunconnected:
        up.out++ --> { @display("m=n"); } --> transportOut;
        up.in++ <-- { @display("m=n"); } <-- transportIn;

        nextHop.transportOut --> up.in++;
        nextHop.transportIn <-- up.out++;

        up.out++ --> echo.ipIn;
        up.in++ <-- echo.ipOut;

        lp.out++ --> arp.ifIn;
        lp.in++ <-- arp.ifOut;

        lp.out++ --> nextHop.queueIn;
        lp.in++ <-- nextHop.queueOut;

        lp.in++ <-- { @display("m=s"); } <-- ifIn;
        lp.out++ --> { @display("m=s"); } --> ifOut;
}

File: src/inet/networklayer/nexthop/NextHopNetworkLayer.ned

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