30 May
2025
30 May
'25
4:45 p.m.
pespin has uploaded this change for review. (
https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/40412?usp=email )
Change subject: 5gc: Initial NAS transmitting support
......................................................................
5gc: Initial NAS transmitting support
With this patch it is already possible to transmit the NAS Auth Response
in the test ConnHdlr.
We still lack generating a proper RES to have the response properly
accepted.
Change-Id: I951e98217b0150eed58fabb8e50a4782c1a3b510
---
M 5gc/C5G_Tests.ttcn
M library/NGAP_Emulation.ttcn
M library/NGAP_Functions.ttcn
M library/NG_NAS_Osmo_Templates.ttcn
4 files changed, 98 insertions(+), 48 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/12/40412/1
diff --git a/5gc/C5G_Tests.ttcn b/5gc/C5G_Tests.ttcn
index 320d61f..9b45298 100644
--- a/5gc/C5G_Tests.ttcn
+++ b/5gc/C5G_Tests.ttcn
@@ -275,6 +275,12 @@
var template (present) NAS_KeySetIdentifier kset_id := f_tr_ConnHdlr_kset_id();
[] NGAP.receive(cr_NG_AUTHENTICATION_REQUEST) -> value rx_nas {
log("Rx NAS message: ", rx_nas);
+
+ g_pars.kset_id := rx_nas.authentication_Request.ngNasKeySetId;
+
+ /* TODO: generate proper RES, 3GPP TS 33.501 A.4 */
+ const OCT8 res := '6a91970e838fd079'O;
+ NGAP.send(cs_NG_AUTHENTICATION_RESPONSE(cs_AuthenticationResponseParameter(oct2bit(res))));
}
}
@@ -284,14 +290,12 @@
var template (value) NG_NAS_UL_Message_Type nas_ul_msg;
var NAS_PDU nas_pdu;
-
p_ueLocInf := m_uPTransportLayerInformation_userLocationInformationNR(
m_userLocationInformationNR(
g_pars.ngran_pars[g_pars.c5g_idx].cell_identity.nR_CGI,
ts_ngran_NGAP_TAI(g_pars.ngran_pars[g_pars.c5g_idx])
));
-
nas_ul_msg := cs_NG_REGISTRATION_REQUEST(cs_RegistrationType(tsc_NG_RegistrationInitial,
'1'B),
g_pars.kset_id.nasKeySetId,
g_pars.kset_id.tsc,
@@ -299,17 +303,26 @@
f_SUCI_IMSI()),
p_UESecurityCap := cs_NG_UE_SecurityCapability);
nas_pdu := enc_NG_NAS_UL_Message_Type(valueof(nas_ul_msg));
-
-
tx_pdu := m_ngap_initMsg(m_n2_initialUeMessage(g_pars.c5g_idx,
nas_pdu, /* Registration request */
p_ueLocInf,
mo_Signalling));
-
NGAP.send(tx_pdu);
+
+ /* Expect updated KSI from network following 5G Core standards
+ *(open5gs.git 70310979c58fe186e9eaa06bec9d9a31f24ff7a1): */
+ if (g_pars.kset_id.nasKeySetId != tsc_NasKsi_NoKey) {
+ if (g_pars.kset_id.nasKeySetId == '110'B) {
+ g_pars.kset_id.nasKeySetId := '000'B;
+ } else {
+ g_pars.kset_id.nasKeySetId := int2bit(bit2int(g_pars.kset_id.nasKeySetId) + 1, 3);
+ }
+ }
+
as_ngap_handle_auth();
/* TODO: handle Auth, SecurityModeCommand, InitialContextSetup, PDUSessionresource, */
+ f_sleep(5.0);
}
/* NG Setup procedure to 5GC using a Global gNB ID containing unknown/foreign PLMN.
diff --git a/library/NGAP_Emulation.ttcn b/library/NGAP_Emulation.ttcn
index 46f1d63..12487ae 100644
--- a/library/NGAP_Emulation.ttcn
+++ b/library/NGAP_Emulation.ttcn
@@ -144,9 +144,8 @@
type record AssociationData {
NGAP_ConnHdlr comp_ref, /* component handling this UE connection */
uint32_t ran_ue_ngap_id optional, /* eNB side NGAP ID */
- uint40_t amf_ue_ngap_id optional//, /* AMF side NGAP ID */
- //EUTRAN_CGI cgi optional,
- //TAI tai optional,
+ uint40_t amf_ue_ngap_id optional, /* AMF side NGAP ID */
+ UserLocationInformation uli optional
//NAS_UE_State nus
};
@@ -329,8 +328,7 @@
for (var integer i := 0; i < sizeof(NGapAssociationTable); i := i+1) {
NGapAssociationTable[i].amf_ue_ngap_id := omit;
NGapAssociationTable[i].ran_ue_ngap_id := omit;
- //NGapAssociationTable[i].cgi := omit;
- //NGapAssociationTable[i].tai := omit;
+ NGapAssociationTable[i].uli := omit;
//NGapAssociationTable[i].nus := valueof(t_NAS_UE_State(g_pars.role));
NGapAssociationTable[i].comp_ref := null;
}
@@ -356,26 +354,27 @@
}
function handle_NGAP_UeContextReleaseCmd(template (present) NGAP_PDU rel_cmd) runs on
NGAP_Emulation_CT {
-// if
(ispresent(rel_cmd.initiatingMessage.value_.uEContextReleaseCommand.protocolIEs[0].value_.uE_NGAP_IDs.uE_NGAP_ID_pair))
{
-// var template AMF_UE_NGAP_ID amf_ue_id;
-// var template RAN_UE_NGAP_ID ran_ue_id;
-// var integer assoc_id;
-// var NGAP_ConnHdlr vc_conn
-//
-// amf_ue_id :=
rel_cmd.initiatingMessage.value_.uEContextReleaseCommand.protocolIEs[0].value_.uE_NGAP_IDs.uE_NGAP_ID_pair.mME_UE_NGAP_ID;
-// ran_ue_id :=
rel_cmd.initiatingMessage.value_.uEContextReleaseCommand.protocolIEs[0].value_.uE_NGAP_IDs.uE_NGAP_ID_pair.eNB_UE_NGAP_ID;
-//
-// assoc_id := f_assoc_id_by_ngap_ids(amf_ue_id, ran_ue_id);
-// vc_conn := NGapAssociationTable[assoc_id].comp_ref;
-//
-// f_ngap_id_table_del(vc_conn, valueof(ran_ue_id));
-// } else {
-// /* TODO: The UE CONTEXT RELEASE COMMAND (see also: 3GPP TS 36.413, section 9.1.4.6),
may identify the
-// * context by either an uE_NGAP_ID_pair (AMF_UE_NGAP_ID and RAN_UE_NGAP_ID) or an
AMF_UE_NGAP_ID alone.
-// * The latter case is not implemented here yet. */
-// setverdict(fail, "complete implementation of UeContextReleaseCmd
handling");
-// mtc.stop;
-// }
+ if
(ispresent(rel_cmd.initiatingMessage.value_.uEContextReleaseCommand.protocolIEs[0].value_.uE_NGAP_IDs.uE_NGAP_ID_pair))
{
+ var UE_NGAP_ID_pair ids :=
valueof(rel_cmd.initiatingMessage.value_.uEContextReleaseCommand.protocolIEs[0].value_.uE_NGAP_IDs.uE_NGAP_ID_pair);
+ var template AMF_UE_NGAP_ID amf_ue_id;
+ var template RAN_UE_NGAP_ID ran_ue_id;
+ var integer assoc_id;
+ var NGAP_ConnHdlr vc_conn
+
+ amf_ue_id := ids.aMF_UE_NGAP_ID;
+ ran_ue_id := ids.rAN_UE_NGAP_ID;
+
+ assoc_id := f_assoc_id_by_ngap_ids(amf_ue_id, ran_ue_id);
+ vc_conn := NGapAssociationTable[assoc_id].comp_ref;
+
+ f_ngap_id_table_del(vc_conn, valueof(ran_ue_id));
+ } else {
+ /* TODO: The UE CONTEXT RELEASE COMMAND (see also: 3GPP TS 36.413, section 9.1.4.6),
may identify the
+ * context by either an uE_NGAP_ID_pair (AMF_UE_NGAP_ID and RAN_UE_NGAP_ID) or an
AMF_UE_NGAP_ID alone.
+ * The latter case is not implemented here yet. */
+ setverdict(fail, "complete implementation of UeContextReleaseCmd handling");
+ mtc.stop;
+ }
}
private function SendToNGapExpectTableProc(NGAP_PDU msg) runs on NGAP_Emulation_CT {
@@ -446,7 +445,7 @@
while (true) {
var NGAP_ConnHdlr vc_conn;
- //var PDU_NAS_EPS nas;
+ var NG_NAS_UL_Message_Type ul_nas_msg;
var AMF_UE_NGAP_ID amf_id;
var RAN_UE_NGAP_ID ran_id;
var integer procedureCode;
@@ -461,12 +460,24 @@
[] NGAP_CLIENT.receive(mw_ngap_initMsg(mw_n2_initialUeMessage)) -> value msg sender
vc_conn {
/* create a table entry about this connection */
ai := f_ngap_id_table_add(vc_conn, omit, valueof(f_NGAP_get_RAN_UE_NGAP_ID(msg)));
- /* Store CGI + TAI so we can use it for generating UlNasTransport from NAS */
-// NGapAssociationTable[ai].tai :=
msg.initiatingMessage.value_.InitialUEMessage.protocolIEs[2].value_.TAI;
-// NGapAssociationTable[ai].cgi :=
msg.initiatingMessage.value_.InitialUEMessage.protocolIEs[3].value_.EUTRAN_CGI;
+ /* Store ULI so we can use it for generating UlNasTransport from NAS */
+ NGapAssociationTable[ai].uli :=
msg.initiatingMessage.value_.InitialUEMessage.protocolIEs[2].value_.userLocationInformation;
// /* Pass message through */
NGAP.send(t_NGAP_Send(g_ngap_conn_id, msg));
}
+ /* NAS from client: Wrap in NGAP Uplink NAS Transport */
+ [] NGAP_CLIENT.receive(NG_NAS_UL_Message_Type:?) -> value ul_nas_msg sender vc_conn
{
+ var integer assoc_id := f_assoc_id_by_comp(vc_conn);
+ var AssociationData ad := NGapAssociationTable[assoc_id];
+ //ul_nas_msg := f_nas_encaps(NGapAssociationTable[assoc_id].nus, ul_nas_msg);
+ var NAS_PDU nas_enc := enc_NG_NAS_UL_Message_Type(ul_nas_msg);
+ NGAP.send(t_NGAP_Send(g_ngap_conn_id,
+ m_ngap_initMsg(
+ m_n2_UplinkNASTransport(ad.amf_ue_ngap_id,
+ ad.ran_ue_ngap_id,
+ nas_enc,
+ ad.uli))));
+ }
/* NGAP from client: pass on transparently */
[] NGAP_CLIENT.receive(NGAP_PDU:?) -> value msg sender vc_conn {
/* Pass message through */
diff --git a/library/NGAP_Functions.ttcn b/library/NGAP_Functions.ttcn
index 1323ab9..70d8941 100644
--- a/library/NGAP_Functions.ttcn
+++ b/library/NGAP_Functions.ttcn
@@ -25,10 +25,8 @@
case (mw_n2_DownlinkNASTransport) {
return im.value_.downlinkNASTransport.protocolIEs[0].value_.aMF_UE_NGAP_ID;
}
- case (?) {
- return omit;
- /* TODO */
- /* return im.value_.InitialUEMessage.protocolIEs[0].value_.AMF_UE_NGAP_ID; */
+ case (mw_n2_UEContextReleaseCommand) {
+ return
im.value_.uEContextReleaseCommand.protocolIEs[0].value_.uE_NGAP_IDs.uE_NGAP_ID_pair.aMF_UE_NGAP_ID;
}
/* TODO */
}
@@ -67,6 +65,9 @@
case (mw_n2_DownlinkNASTransport) {
return im.value_.downlinkNASTransport.protocolIEs[1].value_.RAN_UE_NGAP_ID;
}
+ case (mw_n2_UEContextReleaseCommand) {
+ return
im.value_.uEContextReleaseCommand.protocolIEs[0].value_.uE_NGAP_IDs.uE_NGAP_ID_pair.rAN_UE_NGAP_ID;
+ }
/* TODO */
}
} else if (ischosen(ngap.successfulOutcome)) {
diff --git a/library/NG_NAS_Osmo_Templates.ttcn b/library/NG_NAS_Osmo_Templates.ttcn
index a22c542..1108947 100644
--- a/library/NG_NAS_Osmo_Templates.ttcn
+++ b/library/NG_NAS_Osmo_Templates.ttcn
@@ -31,10 +31,11 @@
}
return len;
}
-template (value) NG_UE_SecurityCapability cs_NG_UE_SecurityCapability(template (value)
O1_Type ngeaCap := 'f0'O,
- template (value) O1_Type ngiaCap := '70'O,
- template (omit) O1_Type eeaCap := omit,
- template (omit) O1_Type eiaCap := omit) :=
+template (value) NG_UE_SecurityCapability
+cs_NG_UE_SecurityCapability(template (value) O1_Type ngeaCap := 'f0'O,
+ template (value) O1_Type ngiaCap := '70'O,
+ template (omit) O1_Type eeaCap := omit,
+ template (omit) O1_Type eiaCap := omit) :=
{
iei := '2E'O,
iel := int2oct(f_cs_NG_UE_SecurityCapability_length(eeaCap, eiaCap), 1),
@@ -45,14 +46,23 @@
spare := omit
};
+template (value) AuthenticationResponseParameter
+cs_AuthenticationResponseParameter(template (value) B32_128_Type p_ExpectedRES) :=
+{
+ iei := '2D'O,
+ iel := int2oct(lengthof(bit2oct(valueof(p_ExpectedRES))), 1),
+ res := p_ExpectedRES
+}
+
/* 24.501 cl. 8.2.1 */
-template (present) NG_NAS_DL_Message_Type cr_NG_AUTHENTICATION_REQUEST(template (present)
NAS_KsiValue p_KeySetId := ?,
- template (present) ABBA p_ABBA := ?,
- template RAND p_RAND := *,
- template AUTN p_AUTN := *,
- template EAP_Message p_EAP := *
- ) :=
+template (present) NG_NAS_DL_Message_Type
+cr_NG_AUTHENTICATION_REQUEST(template (present) NAS_KsiValue p_KeySetId := ?,
+ template (present) ABBA p_ABBA := ?,
+ template RAND p_RAND := *,
+ template AUTN p_AUTN := *,
+ template EAP_Message p_EAP := *
+ ) :=
{ /* 24.501 cl. 8.2.1 */
authentication_Request := {
protocolDiscriminator := tsc_EPD_GMM, /* cl. 9.2 M V 1
*/
@@ -68,4 +78,19 @@
}
}
+/* 24.501 cl. 8.2.2 */
+template (value) NG_NAS_UL_Message_Type
+cs_NG_AUTHENTICATION_RESPONSE(template (value) AuthenticationResponseParameter p_Res,
+ template (omit) EAP_Message p_EAP := omit) :=
+{
+ authentication_Response := {
+ protocolDiscriminator := tsc_EPD_GMM, /* cl. 9.2 M V 1 */
+ spareHalfOctet := tsc_SpareHalfOctet, /* cl. 9.3 M V 1/2 */
+ securityHeaderType := tsc_SHT_NoSecurityProtection,
+ messageType := tsc_MT_NG_AuthenticationResponse, /* cl. 9.7 M V 1 */
+ authResponseParam := p_Res, /* cl. 9.11.3.17 O TLV 18 IEI=2D */
+ eapMessage := p_EAP /* cl. 9.11.2.2 O TLV-E 7-1503 IEI=78 */
+}
+}
+
}
--
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Gerrit-MessageType: newchange
Gerrit-Project: osmo-ttcn3-hacks
Gerrit-Branch: master
Gerrit-Change-Id: I951e98217b0150eed58fabb8e50a4782c1a3b510
Gerrit-Change-Number: 40412
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <pespin(a)sysmocom.de>