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osmo-ttcn3-hacks
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library/GTPv2_Emulation: Patch SeqNr only on outbound initial messages 

Change-Id: I0f13074ccee2bf2d00d2dc2af491b9effc142f22
This commit is contained in:
Pau Espin 2023-12-13 19:11:13 +01:00
parent fa2b384f2a
commit d7ae2c4eb2
1 changed files with 77 additions and 8 deletions
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85
library/GTPv2_Emulation.ttcn
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@ -340,6 +340,73 @@ function f_gtp2c_extract_imsi(PDU_GTPCv2 gtp) return template (omit) hexstring {
return omit;
}
private function f_gtp2c_is_initial_msg(PDU_GTPCv2 msg) return boolean
{
if (ischosen(msg.gtpcv2_pdu.echoRequest) or
ischosen(msg.gtpcv2_pdu.versionNotSupported) or
ischosen(msg.gtpcv2_pdu.createSessionRequest) or
ischosen(msg.gtpcv2_pdu.createBearerRequest) or
ischosen(msg.gtpcv2_pdu.bearerResourceCommand) or
ischosen(msg.gtpcv2_pdu.bearerResourceFailureIndication) or
ischosen(msg.gtpcv2_pdu.modifyBearerRequest) or
ischosen(msg.gtpcv2_pdu.deleteSessionRequest) or
ischosen(msg.gtpcv2_pdu.deleteBearerRequest) or
ischosen(msg.gtpcv2_pdu.downlinkDataNotification) or
ischosen(msg.gtpcv2_pdu.downlinkDataNotificationAcknowledgement) or
ischosen(msg.gtpcv2_pdu.downlinkDataNotificationFailureIndication) or
ischosen(msg.gtpcv2_pdu.deleteIndirectDataForwardingTunnelRequest) or
ischosen(msg.gtpcv2_pdu.modifyBearerCommand) or
ischosen(msg.gtpcv2_pdu.modifyBearerFailureIndication) or
ischosen(msg.gtpcv2_pdu.updateBearerRequest) or
ischosen(msg.gtpcv2_pdu.deleteBearerCommand) or
ischosen(msg.gtpcv2_pdu.createIndirectDataForwardingTunnelRequest) or
ischosen(msg.gtpcv2_pdu.releaseAccessBearersRequest) or
ischosen(msg.gtpcv2_pdu.stopPagingIndication) or
ischosen(msg.gtpcv2_pdu.modifyAccessBearersRequest) or
ischosen(msg.gtpcv2_pdu.remoteUEReportNotification) or
ischosen(msg.gtpcv2_pdu.remoteUEReportAcknowledge) or
ischosen(msg.gtpcv2_pdu.forwardRelocationRequest) or
ischosen(msg.gtpcv2_pdu.forwardRelocationCompleteNotification) or
ischosen(msg.gtpcv2_pdu.forwardRelocationCompleteAcknowledge) or
ischosen(msg.gtpcv2_pdu.contextRequest) or
ischosen(msg.gtpcv2_pdu.contextAcknowledge) or
ischosen(msg.gtpcv2_pdu.identificationRequest) or
ischosen(msg.gtpcv2_pdu.forwardAccessContextNotification) or
ischosen(msg.gtpcv2_pdu.forwardAccessContextAcknowledge) or
ischosen(msg.gtpcv2_pdu.detachNotification) or
ischosen(msg.gtpcv2_pdu.detachAcknowledge) or
ischosen(msg.gtpcv2_pdu.changeNotificationRequest) or
ischosen(msg.gtpcv2_pdu.relocationCancelRequest) or
ischosen(msg.gtpcv2_pdu.configurationTransferTunnel) or
ischosen(msg.gtpcv2_pdu.rAN_InformationRelay) or
ischosen(msg.gtpcv2_pdu.suspendNotification) or
ischosen(msg.gtpcv2_pdu.suspendAcknowledge) or
ischosen(msg.gtpcv2_pdu.resumeNotification) or
ischosen(msg.gtpcv2_pdu.resumeAcknowledge) or
ischosen(msg.gtpcv2_pdu.cSPagingIndication) or
ischosen(msg.gtpcv2_pdu.createForwardingTunnelRequest) or
ischosen(msg.gtpcv2_pdu.deletePDN_ConnectionSetRequest) or
ischosen(msg.gtpcv2_pdu.traceSessionActivation) or
ischosen(msg.gtpcv2_pdu.traceSessionDeactivation) or
ischosen(msg.gtpcv2_pdu.updatePDN_ConnectionSetRequest) or
ischosen(msg.gtpcv2_pdu.pGW_RestartNotification) or
ischosen(msg.gtpcv2_pdu.pGW_RestartNotificationAcknowledge) or
ischosen(msg.gtpcv2_pdu.pGW_DownlinkTriggeringNotification) or
ischosen(msg.gtpcv2_pdu.pGW_DownlinkTriggeringAcknowledge) or
ischosen(msg.gtpcv2_pdu.alertMMENotification) or
ischosen(msg.gtpcv2_pdu.alertMMEAcknowledge) or
ischosen(msg.gtpcv2_pdu.uEActivityNotification) or
ischosen(msg.gtpcv2_pdu.uEActivityAcknowledge) or
ischosen(msg.gtpcv2_pdu.mBMSSessionStartRequest) or
ischosen(msg.gtpcv2_pdu.mBMSSessionUpdateRequest) or
ischosen(msg.gtpcv2_pdu.mBMSSessionStopRequest) or
ischosen(msg.gtpcv2_pdu.iSR_StatusIndication) or
ischosen(msg.gtpcv2_pdu.uE_RegistrationQueryRequest)) {
return true;
}
return false;
}
private template (value) SctpTuple ts_SCTP(template (omit) integer ppid := omit) := {
sinfo_stream := omit,
sinfo_ppid := ppid,
@ -507,10 +574,11 @@ function main(Gtp2EmulationCfg cfg) runs on GTPv2_Emulation_CT {
}
[] TEID0.receive(PDU_GTPCv2:?) -> value g2c sender vc_conn {
/* patch in the next sequence number */
/* FIXME: do this only for outbound requests */
g2c.sequenceNumber := int2oct(g_c_seq_nr, 3);
g_c_seq_nr := g_c_seq_nr + 1;
/* patch in the next sequence number on outbound Initial message */
if (f_gtp2c_is_initial_msg(g2c)) {
g2c.sequenceNumber := int2oct(g_c_seq_nr, 3);
g_c_seq_nr := g_c_seq_nr + 1;
}
/* build Gtp2cUnitdata */
g2c_ud := { peer := g_peer, gtpc := g2c };
GTP2C.send(g2c_ud);
@ -520,10 +588,11 @@ function main(Gtp2EmulationCfg cfg) runs on GTPv2_Emulation_CT {
}
[] CLIENT.receive(PDU_GTPCv2:?) -> value g2c sender vc_conn {
/* patch in the next sequence number */
/* FIXME: do this only for outbound requests */
g2c.sequenceNumber := int2oct(g_c_seq_nr, 3);
g_c_seq_nr := g_c_seq_nr + 1;
/* patch in the next sequence number on outbound Initial message */
if (f_gtp2c_is_initial_msg(g2c)) {
g2c.sequenceNumber := int2oct(g_c_seq_nr, 3);
g_c_seq_nr := g_c_seq_nr + 1;
}
/* build Gtp2cUnitdata */
g2c_ud := { peer := g_peer, gtpc := g2c };
GTP2C.send(g2c_ud);