Crash while running custom scenario

[himanshu3]

I built PacketRusher and was able to test free5GC successfully but while trying custom scenario (without making any modification to scenarios/sample/sample.go) it crashes. Following are the steps:

1. build custom scenario wasm using scenarios/build.sh
2. from $PACKET_RUSHER_HOME execute:
   sudo ./packetrusher custom-scenario --scenario ./scenarios/sample.go.wasm

Following are the logs:
INFO[0000] Selecting 10.73.73.150 for host 10.73.73.150 as AMF's IP address
INFO[0000] Selecting 10.71.71.113 for host 10.71.71.113 as gNodeB's N3/Data IP address
INFO[0000] Selecting 10.71.71.113 for host 10.71.71.113 as gNodeB's N2/Control IP address
INFO[0000] Loaded config at: /home/user1/code/PacketRusher/config/config.yml
INFO[0000] [GNB] SCTP/NGAP service is running
INFO[0000] [GNB] Initiating NG Setup Request
INFO[0000] [GNB][SCTP] Receive message in 0 stream
INFO[0000] [GNB][NGAP] Receive NG Setup Response
INFO[0000] [GNB][AMF] AMF Name: AMF
INFO[0000] [GNB][AMF] State of AMF: Active
INFO[0000] [GNB][AMF] Capacity of AMF: 255
INFO[0000] [GNB][AMF] PLMNs Identities Supported by AMF -- mcc: 315 mnc:010
INFO[0000] [GNB][AMF] List of AMF slices Supported by AMF -- sst:01 sd:010203
INFO[0000] [GNB][AMF] List of AMF slices Supported by AMF -- sst:01 sd:112233
INFO[0001] [GNB] Received incoming connection from new UE
INFO[0001] [GNB] UE MCC: 315 MNC: 010
FATA[0001] func[env.pduSessionRequest] param[1] is unsupported: uint8

I even tried changing argument type of pduSessionRequest in scenarios/sample/sample.go

1. from func pduSessionRequest(uint32, uint32) to func pduSessionRequest(uint32, uint8)
2. for pduSessionId:=uint8(1); pduSessionId<2; pduSessionId++ {
   fmt.Println("Hi, I'm an UE that wants to request PDU Session id: ", pduSessionId)
   pduSessionRequest(ueId, pduSessionId)
   }

but again same result.

I am not sure, if I am missing something here or is it a bug?

• OS: Ubuntu 20.04 [5.15.0-92-generic]
• Commit Id: 2bbcc24

[linouxis9]

Hi @himanshu3,

Thanks a lot for testing the custom scenario WebAssembly feature!
The project has evolved quite a lot since I've started working on this feature and I had not the time to work on it, it's very likely it has not kept with the latest changes.
While I fix this bug, I would recommend you to write your custom scenario by editing the PacketRusher's main scenario directly in PacketRusher's Go source here:

PacketRusher/internal/common/tools/tools.go

Line 112 in 32a08fa

func SimulateSingleUE(simConfig UESimulationConfig, wg *sync.WaitGroup) {

I hope it helps!

Cheers,
Valentin

[himanshu3]

Thanks for pointing to PacketRusher/internal/common/tools/tools.go