Network layer of an IPv4 node.

Interfaces to transport layer: TCP, UDP, echo/ping, RSVP

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.

Used in compound modules

Name	Type	Description
LDP_LSR	compound module	An LDP-capable router.
RSVP_LSR	compound module	An RSVP-TE capable router.

Parameters

Name	Type	Default value	Description
proxyARP	bool	true
hasIpsec	bool	false
igmpType	string	"IGMPv2"
arpType	string	"ARP"
interfaceTableModule	string
routingTableModule	string

Properties

Name	Value	Description
display	i=block/fork

Gates

Name	Direction	Size	Description
ifIn [ ]	input
ifOut [ ]	output
transportIn [ ]	input
transportOut [ ]	output
pingIn [ ]	input
pingOut [ ]	output
igmpIn	input
igmpOut	output

Unassigned submodule parameters

Name	Type	Default value	Description
configurator.interfaceTableModule	string		The path to the InterfaceTable module
configurator.networkConfiguratorModule	string	"configurator"	TODO: eventually rename to networkConfigurator
configurator.configureRoutingTable	bool	true	add routing entries to routing table (uses the configurator module)
ip.interfaceTableModule	string		The path to the InterfaceTable module
ip.routingTableModule	string
ip.arpModule	string
ip.icmpModule	string
ip.procDelay	double	0s
ip.timeToLive	int	32
ip.multicastTimeToLive	int	32
ip.fragmentTimeout	double	60s
ip.forceBroadcast	bool	false
icmp.interfaceTableModule	string		The path to the InterfaceTable module
icmp.routingTableModule	string
ipsec.networkProtocolModule	string	"^.ip"
ipsec.spdModule	string	"^.spd"
ipsec.sadModule	string	"^.sad"
ipsec.spdConfig	xml
ipsec.defaultProtection	string	""	if not "": value to use where <Protection> element is absent from the configuration
ipsec.defaultEspMode	string	""	if not "": value to use where <EspMode> element is absent from the configuration
ipsec.defaultEncryptionAlg	string	""	if not "": value to use where <EncryptionAlg> element is absent from the configuration
ipsec.defaultAuthenticationAlg	string	""	if not "": value to use where <defaultAuthenticationAlg> element is absent from the configuration
ipsec.defaultMaxTfcPadLength	int	0	value to use where <MaxTfcPadLength> element is absent from the configuration
ipsec.ahProtectOutDelay	double	0.0s
ipsec.ahProtectInDelay	double	0.0s
ipsec.espProtectOutDelay	double	0.0s
ipsec.espProtectInDelay	double	0.0s

Source code

//
// Network layer of an IPv4 node.
//
// Interfaces to transport layer: TCP, UDP, echo/ping, RSVP
//
module IPv4NetworkLayer like INetworkLayer
{
    parameters:
        bool proxyARP = default(true);
        bool hasIpsec = default(false);
        string igmpType = default("IGMPv2");
        string arpType = default("ARP");
        string interfaceTableModule;
        string routingTableModule;
        *.interfaceTableModule = default(absPath(this.interfaceTableModule));
        *.routingTableModule = default(absPath(this.routingTableModule));
        *.arpModule = default(absPath(".arp"));
        *.icmpModule = default(absPath(".icmp"));
        arp.respondToProxyARP = this.proxyARP;
        @display("i=block/fork");
    gates:
        input ifIn[] @labels(INetworkDatagram);
        output ifOut[] @labels(INetworkDatagram);
        input transportIn[] @labels(IPv4ControlInfo/down);
        output transportOut[] @labels(IPv4ControlInfo/up);
        input pingIn[] @labels(PingPayload/down);
        output pingOut[] @labels(PingPayload/up);
        input igmpIn;
        output igmpOut;

    submodules:
        configurator: IPv4NodeConfigurator {
            @display("p=39,158");
        }
        ip: IPv4 {
            parameters:
                useProxyARP = true; // as routes with unspecified next-hop addr are quite common
                @display("p=85,95;q=queue");
            gates:
                queueIn[sizeof(parent.ifIn)];
                queueOut[sizeof(parent.ifOut)];
        }
        arp: <arpType> like IARP {
            parameters:
                @display("p=165,120;q=pendingQueue;is=s");
        }
        icmp: ICMP {
            parameters:
                @display("p=165,70");
        }
        igmp: <igmpType> like IIGMP {
            parameters:
                @display("p=39,33");
        }
        errorHandling: ErrorHandling {
            parameters:
                @display("p=239,70");
        }

        ipsec: IPsec if hasIpsec {
            @display("p=164,162");
        }
        spd: SecurityPolicyDatabase if hasIpsec {
            @display("p=250,120");
        }
        sad: SecurityAssociationDatabase if hasIpsec {
            @display("p=250,162");
        }
    connections allowunconnected:
        for i=0..sizeof(transportIn)-1 {
            transportIn[i] --> { @display("m=n"); } --> ip.transportIn++;
        }
        for i=0..sizeof(transportOut)-1 {
            ip.transportOut++ --> { @display("m=n"); } --> transportOut[i];
        }

        ip.transportOut++ --> icmp.localIn;
        ip.transportIn++ <-- icmp.sendOut;

        ip.transportOut++ --> igmp.ipIn;
        ip.transportIn++ <-- igmp.ipOut;

        for i=0..sizeof(pingOut)-1 {
            icmp.pingOut++ --> { @display("m=n"); } --> pingOut[i];
        }
        for i=0..sizeof(pingIn)-1 {
            icmp.pingIn++ <-- { @display("m=n"); } <-- pingIn[i];
        }

        icmp.errorOut --> errorHandling.in;

        ip.arpOut --> arp.netwIn;
        ip.arpIn <-- arp.netwOut;

        igmp.routerOut --> igmpOut;
        igmp.routerIn <-- igmpIn;

        for i=0..sizeof(ifIn)-1 {
            ip.queueIn[i] <-- { @display("m=s"); } <-- ifIn[i];
        }
        for i=0..sizeof(ifOut)-1 {
            ip.queueOut[i] --> { @display("m=s"); } --> ifOut[i];
        }
}

File: src/inet/networklayer/ipv4/IPv4NetworkLayer.ned

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