NED File src/simu5g/nodes/CellularNicNdSink.ned

Name	Type	Description
CellularNicNdSink	simple module	WORKAROUND: takes what the IPv6 layer of a base station sends to the cellular NIC, which is no interface of the base station's own network layer: the NIC is wired to the user plane (TrafficFlowFilter, GtpUser), not to the link-layer dispatcher (nl). The NIC stays in the interface table nevertheless, because the address configurator builds the routes of the UEs through it, as their neighbor on the cellular link. The network layer's dispatcher maps the NIC to this module (see eNodeB), which discards IPv6 Neighbor Discovery messages (Router and Neighbor Solicitations and Advertisements, Redirects): IPv6 runs them on every interface, and they reach no one over the cellular NIC. Any other packet is an error.

Source code

//
//                  Simu5G
//
// Authors: Andras Varga (OpenSim Ltd)
//
// This file is part of a software released under the license included in file
// "license.pdf". Please read LICENSE and README files before using it.
// The above files and the present reference are part of the software itself,
// and cannot be removed from it.
//

package simu5g.nodes;

//
// WORKAROUND: takes what the IPv6 layer of a base station sends to the cellular
// NIC, which is no interface of the base station's own network layer: the NIC is
// wired to the user plane (~TrafficFlowFilter, ~GtpUser), not to the link-layer
// dispatcher (nl). The NIC stays in the interface table nevertheless, because the
// address configurator builds the routes of the UEs through it, as their neighbor on
// the cellular link. The network layer's dispatcher maps the NIC to this module
// (see ~eNodeB), which discards IPv6 Neighbor Discovery messages (Router and
// Neighbor Solicitations and Advertisements, Redirects): IPv6 runs them on every
// interface, and they reach no one over the cellular NIC. Any other packet is an
// error.
//
// The proper model, which makes this module unnecessary: a UE's IP link runs to the
// UPF over its PDU session, not to the base station; the address configurator
// cannot express that yet.
//
simple CellularNicNdSink
{
    parameters:
        @display("i=block/sink;is=s");
    gates:
        input in;
        output out;  // Unused: pairs the input at the dispatcher, whose gates come in pairs
}