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Initial Context Setup Failure

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NGAP Failure message - Initial Context Setup Failure.
When an Initial Context Setup Request is received with the UE context as null, it triggers Initial Context Setup failure.
This commit is contained in:
Madhuri.G
2024-12-13 15:35:43 +05:30
parent c942fe43a9
commit 7cfa482107
6 changed files with 143 additions and 7 deletions
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openair3/NGAP/ngap_gNB.c
+4
View File
@@ -328,6 +328,10 @@ void *ngap_gNB_process_itti_msg(void *notUsed) {
ngap_gNB_initial_ctxt_resp(instance, &NGAP_INITIAL_CONTEXT_SETUP_RESP(received_msg));
break;
case NGAP_INITIAL_CONTEXT_SETUP_FAIL:
ngap_gNB_initial_ctxt_fail(instance, &NGAP_INITIAL_CONTEXT_SETUP_FAIL(received_msg));
break;
case NGAP_PDUSESSION_SETUP_RESP:
ngap_gNB_pdusession_setup_resp(instance, &NGAP_PDUSESSION_SETUP_RESP(received_msg));
break;
openair3/NGAP/ngap_gNB_nas_procedures.c
+109
View File
@@ -749,6 +749,115 @@ int ngap_gNB_initial_ctxt_resp(instance_t instance, ngap_initial_context_setup_r
return 0;
}
//---------------------------------------------------------------------------------------------------------
int ngap_gNB_initial_ctxt_fail(instance_t instance, ngap_initial_context_setup_fail_t *initial_ctxt_fail)
//---------------------------------------------------------------------------------------------------------
{
ngap_gNB_instance_t *ngap_gNB_instance_p = NULL;
struct ngap_gNB_ue_context_s *ue_context_p = NULL;
NGAP_NGAP_PDU_t pdu;
uint8_t *buffer = NULL;
uint32_t length;
/* Retrieve the NGAP gNB instance associated with Mod_id */
ngap_gNB_instance_p = ngap_gNB_get_instance(instance);
DevAssert(initial_ctxt_fail != NULL);
DevAssert(ngap_gNB_instance_p != NULL);
if ((ue_context_p = ngap_get_ue_context(initial_ctxt_fail->gNB_ue_ngap_id)) == NULL) {
/* The context for this gNB ue ngap id doesn't exist in the map of gNB UEs */
NGAP_WARN("Failed to find ue context associated with gNB ue ngap id: 0x%08x\n", initial_ctxt_fail->gNB_ue_ngap_id);
return -1;
}
/* Uplink NAS transport can occur either during an ngap connected state
* or during initial attach (for example: NAS authentication).
*/
if (!(ue_context_p->ue_state == NGAP_UE_CONNECTED || ue_context_p->ue_state == NGAP_UE_WAITING_CSR)) {
NGAP_WARN(
"You are attempting to send NAS data over non-connected "
"gNB ue ngap id: %08x, current state: %d\n",
initial_ctxt_fail->gNB_ue_ngap_id,
ue_context_p->ue_state);
return -1;
}
/* Prepare the NGAP message to encode */
memset(&pdu, 0, sizeof(pdu));
pdu.present = NGAP_NGAP_PDU_PR_unsuccessfulOutcome;
asn1cCalloc(pdu.choice.unsuccessfulOutcome, out);
out->procedureCode = NGAP_ProcedureCode_id_InitialContextSetup;
out->criticality = NGAP_Criticality_reject;
out->value.present = NGAP_UnsuccessfulOutcome__value_PR_InitialContextSetupFailure;
NGAP_InitialContextSetupFailure_t *fail = &out->value.choice.InitialContextSetupFailure;
/* mandatory */
{
asn1cSequenceAdd(fail->protocolIEs.list, NGAP_InitialContextSetupFailureIEs_t, ie);
ie->id = NGAP_ProtocolIE_ID_id_AMF_UE_NGAP_ID;
ie->criticality = NGAP_Criticality_ignore;
ie->value.present = NGAP_InitialContextSetupFailureIEs__value_PR_AMF_UE_NGAP_ID;
// ie->value.choice.AMF_UE_NGAP_ID = ue_context_p->amf_ue_ngap_id;
asn_uint642INTEGER(&ie->value.choice.AMF_UE_NGAP_ID, ue_context_p->amf_ue_ngap_id);
}
/* mandatory */
{
asn1cSequenceAdd(fail->protocolIEs.list, NGAP_InitialContextSetupFailureIEs_t, ie);
ie->id = NGAP_ProtocolIE_ID_id_RAN_UE_NGAP_ID;
ie->criticality = NGAP_Criticality_ignore;
ie->value.present = NGAP_InitialContextSetupFailureIEs__value_PR_RAN_UE_NGAP_ID;
ie->value.choice.RAN_UE_NGAP_ID = initial_ctxt_fail->gNB_ue_ngap_id;
}
/* mandatory */
{
asn1cSequenceAdd(fail->protocolIEs.list, NGAP_InitialContextSetupFailureIEs_t, ie);
ie->id = NGAP_ProtocolIE_ID_id_Cause;
ie->criticality = NGAP_Criticality_ignore;
ie->value.present = NGAP_InitialContextSetupFailureIEs__value_PR_Cause;
switch (initial_ctxt_fail->cause) {
case NGAP_CAUSE_RADIO_NETWORK:
ie->value.choice.Cause.present = NGAP_Cause_PR_radioNetwork;
ie->value.choice.Cause.choice.radioNetwork = initial_ctxt_fail->cause_value;
break;
case NGAP_CAUSE_TRANSPORT:
ie->value.choice.Cause.present = NGAP_Cause_PR_transport;
ie->value.choice.Cause.choice.transport = initial_ctxt_fail->cause_value;
break;
case NGAP_CAUSE_NAS:
ie->value.choice.Cause.present = NGAP_Cause_PR_nas;
ie->value.choice.Cause.choice.nas = initial_ctxt_fail->cause_value;
break;
case NGAP_CAUSE_PROTOCOL:
ie->value.choice.Cause.present = NGAP_Cause_PR_protocol;
ie->value.choice.Cause.choice.protocol = initial_ctxt_fail->cause_value;
break;
case NGAP_CAUSE_MISC:
ie->value.choice.Cause.present = NGAP_Cause_PR_misc;
ie->value.choice.Cause.choice.misc = initial_ctxt_fail->cause_value;
break;
case NGAP_CAUSE_NOTHING:
default:
AssertFatal(false, "Unknown NGAP Initial Context Setup failure cause %d\n", initial_ctxt_fail->cause);
break;
}
}
if (asn1_xer_print) {
xer_fprint(stdout, &asn_DEF_NGAP_NGAP_PDU, &pdu);
}
if (ngap_gNB_encode_pdu(&pdu, &buffer, &length) < 0) {
NGAP_ERROR("Failed to encode InitialContextSetupFailure\n");
/* Encode procedure has failed... */
return -1;
}
/* UE associated signalling -> use the allocated stream */
LOG_I(NR_RRC, "Send message to sctp: NGAP_InitialContextSetupFailure\n");
ngap_gNB_itti_send_sctp_data_req(ngap_gNB_instance_p->instance,
ue_context_p->amf_ref->assoc_id,
buffer,
length,
ue_context_p->tx_stream);
return 0;
}
//------------------------------------------------------------------------------
int ngap_gNB_ue_capabilities(instance_t instance, ngap_ue_cap_info_ind_t *ue_cap_info_ind_p)
//------------------------------------------------------------------------------
openair3/NGAP/ngap_gNB_nas_procedures.h
+2
View File
@@ -49,6 +49,8 @@ int ngap_gNB_handle_nas_first_req(
int ngap_gNB_initial_ctxt_resp(
instance_t instance, ngap_initial_context_setup_resp_t *initial_ctxt_resp_p);
int ngap_gNB_initial_ctxt_fail(instance_t instance, ngap_initial_context_setup_fail_t *initial_ctxt_fail);
int ngap_gNB_ue_capabilities(instance_t instance,
ngap_ue_cap_info_ind_t *ue_cap_info_ind_p);