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a2d7a353d8b1e01153e0435ab6f235ca9e7c21ab
ueransim/src/gnb/ngap/context.cpp
lai a2d7a353d8 init-version-3.27
2025-08-12 14:15:27 +08:00

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//
// This file is a part of UERANSIM project.
// Copyright (c) 2023 ALİ GÜNGÖR.
//
// https://github.com/aligungr/UERANSIM/
// See README, LICENSE, and CONTRIBUTING files for licensing details.
//
#include "encode.hpp"
#include "task.hpp"
#include "utils.hpp"
#include <gnb/gtp/task.hpp>
#include <gnb/rrc/task.hpp>
#include <asn/ngap/ASN_NGAP_AMF-UE-NGAP-ID.h>
#include <asn/ngap/ASN_NGAP_AssociatedQosFlowItem.h>
#include <asn/ngap/ASN_NGAP_AssociatedQosFlowList.h>
#include <asn/ngap/ASN_NGAP_GTPTunnel.h>
#include <asn/ngap/ASN_NGAP_InitialContextSetupRequest.h>
#include <asn/ngap/ASN_NGAP_InitialContextSetupResponse.h>
#include <asn/ngap/ASN_NGAP_NGAP-PDU.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceFailedToSetupItemCxtRes.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceFailedToSetupItemSURes.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceItemCxtRelReq.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceReleaseCommand.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceReleaseResponse.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceReleaseResponseTransfer.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceReleasedItemRelRes.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceSetupItemCxtReq.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceSetupItemCxtRes.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceSetupItemSUReq.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceSetupItemSURes.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceSetupListCxtReq.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceSetupRequest.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceSetupRequestTransfer.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceSetupResponse.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceSetupResponseTransfer.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceSetupUnsuccessfulTransfer.h>
#include <asn/ngap/ASN_NGAP_PDUSessionResourceToReleaseItemRelCmd.h>
#include <asn/ngap/ASN_NGAP_ProtocolIE-Field.h>
#include <asn/ngap/ASN_NGAP_QosFlowPerTNLInformationItem.h>
#include <asn/ngap/ASN_NGAP_QosFlowPerTNLInformationList.h>
#include <asn/ngap/ASN_NGAP_QosFlowSetupRequestItem.h>
#include <asn/ngap/ASN_NGAP_QosFlowSetupRequestList.h>
#include <asn/ngap/ASN_NGAP_SuccessfulOutcome.h>
#include <asn/ngap/ASN_NGAP_UE-NGAP-ID-pair.h>
#include <asn/ngap/ASN_NGAP_UE-NGAP-IDs.h>
#include <asn/ngap/ASN_NGAP_UEAggregateMaximumBitRate.h>
#include <asn/ngap/ASN_NGAP_UEContextModificationRequest.h>
#include <asn/ngap/ASN_NGAP_UEContextModificationResponse.h>
#include <asn/ngap/ASN_NGAP_UEContextReleaseCommand.h>
#include <asn/ngap/ASN_NGAP_UEContextReleaseComplete.h>
#include <asn/ngap/ASN_NGAP_UEContextReleaseRequest.h>
namespace nr::gnb
{
void NgapTask::receiveInitialContextSetup(int amfId, ASN_NGAP_InitialContextSetupRequest *msg)
{
m_logger->debug("Initial Context Setup Request received");
auto *ue = findUeByNgapIdPair(amfId, ngap_utils::FindNgapIdPair(msg));
if (ue == nullptr)
return;
auto w = std::make_unique<NmGnbNgapToGtp>(NmGnbNgapToGtp::UE_CONTEXT_UPDATE);
w->update = std::make_unique<GtpUeContextUpdate>(true, ue->ctxId, ue->ueAmbr);
m_base->gtpTask->push(std::move(w));
auto *reqIe = asn::ngap::GetProtocolIe(msg, ASN_NGAP_ProtocolIE_ID_id_UEAggregateMaximumBitRate);
if (reqIe)
{
ue->ueAmbr.dlAmbr = asn::GetUnsigned64(reqIe->UEAggregateMaximumBitRate.uEAggregateMaximumBitRateDL) / 8ull;
ue->ueAmbr.ulAmbr = asn::GetUnsigned64(reqIe->UEAggregateMaximumBitRate.uEAggregateMaximumBitRateUL) / 8ull;
}
std::vector<ASN_NGAP_PDUSessionResourceSetupItemCxtRes *> successList;
std::vector<ASN_NGAP_PDUSessionResourceFailedToSetupItemCxtRes *> failedList;
reqIe = asn::ngap::GetProtocolIe(msg, ASN_NGAP_ProtocolIE_ID_id_PDUSessionResourceSetupListCxtReq);
if (reqIe)
{
auto &list = reqIe->PDUSessionResourceSetupListCxtReq.list;
for (int i = 0; i < list.count; i++)
{
auto &item = list.array[i];
auto *transfer = ngap_encode::Decode<ASN_NGAP_PDUSessionResourceSetupRequestTransfer>(
asn_DEF_ASN_NGAP_PDUSessionResourceSetupRequestTransfer, item->pDUSessionResourceSetupRequestTransfer);
if (transfer == nullptr)
{
m_logger->err(
"Unable to decode a PDU session resource setup request transfer. Ignoring the relevant item");
asn::Free(asn_DEF_ASN_NGAP_PDUSessionResourceSetupRequestTransfer, transfer);
continue;
}
auto *resource = new PduSessionResource(ue->ctxId, static_cast<int>(item->pDUSessionID));
auto *ie = asn::ngap::GetProtocolIe(transfer, ASN_NGAP_ProtocolIE_ID_id_PDUSessionAggregateMaximumBitRate);
if (ie)
{
resource->sessionAmbr.dlAmbr =
asn::GetUnsigned64(ie->PDUSessionAggregateMaximumBitRate.pDUSessionAggregateMaximumBitRateDL) /
8ull;
resource->sessionAmbr.ulAmbr =
asn::GetUnsigned64(ie->PDUSessionAggregateMaximumBitRate.pDUSessionAggregateMaximumBitRateUL) /
8ull;
}
ie = asn::ngap::GetProtocolIe(transfer, ASN_NGAP_ProtocolIE_ID_id_DataForwardingNotPossible);
if (ie)
resource->dataForwardingNotPossible = true;
ie = asn::ngap::GetProtocolIe(transfer, ASN_NGAP_ProtocolIE_ID_id_PDUSessionType);
if (ie)
resource->sessionType = ngap_utils::PduSessionTypeFromAsn(ie->PDUSessionType);
ie = asn::ngap::GetProtocolIe(transfer, ASN_NGAP_ProtocolIE_ID_id_UL_NGU_UP_TNLInformation);
if (ie)
{
resource->upTunnel.teid =
(uint32_t)asn::GetOctet4(ie->UPTransportLayerInformation.choice.gTPTunnel->gTP_TEID);
resource->upTunnel.address =
asn::GetOctetString(ie->UPTransportLayerInformation.choice.gTPTunnel->transportLayerAddress);
}
ie = asn::ngap::GetProtocolIe(transfer, ASN_NGAP_ProtocolIE_ID_id_QosFlowSetupRequestList);
if (ie)
{
auto *ptr = asn::New<ASN_NGAP_QosFlowSetupRequestList>();
asn::DeepCopy(asn_DEF_ASN_NGAP_QosFlowSetupRequestList, ie->QosFlowSetupRequestList, ptr);
resource->qosFlows = asn::WrapUnique(ptr, asn_DEF_ASN_NGAP_QosFlowSetupRequestList);
}
auto error = setupPduSessionResource(ue, resource);
if (error.has_value())
{
auto *tr = asn::New<ASN_NGAP_PDUSessionResourceSetupUnsuccessfulTransfer>();
ngap_utils::ToCauseAsn_Ref(error.value(), tr->cause);
OctetString encodedTr =
ngap_encode::EncodeS(asn_DEF_ASN_NGAP_PDUSessionResourceSetupUnsuccessfulTransfer, tr);
if (encodedTr.length() == 0)
throw std::runtime_error("PDUSessionResourceSetupUnsuccessfulTransfer encoding failed");
asn::Free(asn_DEF_ASN_NGAP_PDUSessionResourceSetupUnsuccessfulTransfer, tr);
auto *res = asn::New<ASN_NGAP_PDUSessionResourceFailedToSetupItemCxtRes>();
res->pDUSessionID = resource->psi;
asn::SetOctetString(res->pDUSessionResourceSetupUnsuccessfulTransfer, encodedTr);
failedList.push_back(res);
}
else
{
auto *tr = asn::New<ASN_NGAP_PDUSessionResourceSetupResponseTransfer>();
auto &qosList = resource->qosFlows->list;
for (int iQos = 0; iQos < qosList.count; iQos++)
{
auto *associatedQosFlowItem = asn::New<ASN_NGAP_AssociatedQosFlowItem>();
associatedQosFlowItem->qosFlowIdentifier = qosList.array[iQos]->qosFlowIdentifier;
asn::SequenceAdd(tr->dLQosFlowPerTNLInformation.associatedQosFlowList, associatedQosFlowItem);
}
auto &upInfo = tr->dLQosFlowPerTNLInformation.uPTransportLayerInformation;
upInfo.present = ASN_NGAP_UPTransportLayerInformation_PR_gTPTunnel;
upInfo.choice.gTPTunnel = asn::New<ASN_NGAP_GTPTunnel>();
asn::SetBitString(upInfo.choice.gTPTunnel->transportLayerAddress, resource->downTunnel.address);
asn::SetOctetString4(upInfo.choice.gTPTunnel->gTP_TEID, (octet4)resource->downTunnel.teid);
OctetString encodedTr =
ngap_encode::EncodeS(asn_DEF_ASN_NGAP_PDUSessionResourceSetupResponseTransfer, tr);
if (encodedTr.length() == 0)
throw std::runtime_error("PDUSessionResourceSetupResponseTransfer encoding failed");
asn::Free(asn_DEF_ASN_NGAP_PDUSessionResourceSetupResponseTransfer, tr);
auto *res = asn::New<ASN_NGAP_PDUSessionResourceSetupItemCxtRes>();
res->pDUSessionID = resource->psi;
asn::SetOctetString(res->pDUSessionResourceSetupResponseTransfer, encodedTr);
successList.push_back(res);
}
asn::Free(asn_DEF_ASN_NGAP_PDUSessionResourceSetupRequestTransfer, transfer);
}
}
reqIe = asn::ngap::GetProtocolIe(msg, ASN_NGAP_ProtocolIE_ID_id_NAS_PDU);
if (reqIe)
deliverDownlinkNas(ue->ctxId, asn::GetOctetString(reqIe->NAS_PDU));
std::vector<ASN_NGAP_InitialContextSetupResponseIEs *> responseIes;
if (!successList.empty())
{
auto *ie = asn::New<ASN_NGAP_InitialContextSetupResponseIEs>();
ie->id = ASN_NGAP_ProtocolIE_ID_id_PDUSessionResourceSetupListCxtRes;
ie->criticality = ASN_NGAP_Criticality_ignore;
ie->value.present = ASN_NGAP_InitialContextSetupResponseIEs__value_PR_PDUSessionResourceSetupListCxtRes;
for (auto &item : successList)
asn::SequenceAdd(ie->value.choice.PDUSessionResourceSetupListCxtRes, item);
responseIes.push_back(ie);
}
if (!failedList.empty())
{
auto *ie = asn::New<ASN_NGAP_InitialContextSetupResponseIEs>();
ie->id = ASN_NGAP_ProtocolIE_ID_id_PDUSessionResourceFailedToSetupListCxtRes;
ie->criticality = ASN_NGAP_Criticality_ignore;
ie->value.present = ASN_NGAP_InitialContextSetupResponseIEs__value_PR_PDUSessionResourceFailedToSetupListCxtRes;
for (auto &item : failedList)
asn::SequenceAdd(ie->value.choice.PDUSessionResourceFailedToSetupListCxtRes, item);
responseIes.push_back(ie);
}
auto *response = asn::ngap::NewMessagePdu<ASN_NGAP_InitialContextSetupResponse>(responseIes);
sendNgapUeAssociated(ue->ctxId, response);
}
void NgapTask::receiveContextRelease(int amfId, ASN_NGAP_UEContextReleaseCommand *msg)
{
m_logger->debug("UE Context Release Command received");
auto *ue = findUeByNgapIdPair(amfId, ngap_utils::FindNgapIdPairFromUeNgapIds(msg));
if (ue == nullptr)
return;
// Notify RRC task
auto w1 = std::make_unique<NmGnbNgapToRrc>(NmGnbNgapToRrc::AN_RELEASE);
w1->ueId = ue->ctxId;
m_base->rrcTask->push(std::move(w1));
// Notify GTP task
auto w2 = std::make_unique<NmGnbNgapToGtp>(NmGnbNgapToGtp::UE_CONTEXT_RELEASE);
w2->ueId = ue->ctxId;
m_base->gtpTask->push(std::move(w2));
auto *response = asn::ngap::NewMessagePdu<ASN_NGAP_UEContextReleaseComplete>({});
sendNgapUeAssociated(ue->ctxId, response);
deleteUeContext(ue->ctxId);
}
void NgapTask::receiveContextModification(int amfId, ASN_NGAP_UEContextModificationRequest *msg)
{
m_logger->debug("UE Context Modification Request received");
auto *ue = findUeByNgapIdPair(amfId, ngap_utils::FindNgapIdPair(msg));
if (ue == nullptr)
return;
auto *ie = asn::ngap::GetProtocolIe(msg, ASN_NGAP_ProtocolIE_ID_id_UEAggregateMaximumBitRate);
if (ie)
{
ue->ueAmbr.dlAmbr = asn::GetUnsigned64(ie->UEAggregateMaximumBitRate.uEAggregateMaximumBitRateDL);
ue->ueAmbr.ulAmbr = asn::GetUnsigned64(ie->UEAggregateMaximumBitRate.uEAggregateMaximumBitRateUL);
}
ie = asn::ngap::GetProtocolIe(msg, ASN_NGAP_ProtocolIE_ID_id_NewAMF_UE_NGAP_ID);
if (ie)
{
int64_t old = ue->amfUeNgapId;
ue->amfUeNgapId = asn::GetSigned64(ie->AMF_UE_NGAP_ID_1);
m_logger->debug("AMF-UE-NGAP-ID changed from %ld to %ld", old, ue->amfUeNgapId);
}
auto *response = asn::ngap::NewMessagePdu<ASN_NGAP_UEContextModificationResponse>({});
sendNgapUeAssociated(ue->ctxId, response);
auto w = std::make_unique<NmGnbNgapToGtp>(NmGnbNgapToGtp::UE_CONTEXT_UPDATE);
w->update = std::make_unique<GtpUeContextUpdate>(false, ue->ctxId, ue->ueAmbr);
m_base->gtpTask->push(std::move(w));
}
void NgapTask::sendContextRelease(int ueId, NgapCause cause)
{
m_logger->debug("Sending UE Context release request (NG-RAN node initiated)");
auto *ue = findUeContext(ueId);
if (ue == nullptr)
return;
std::vector<ASN_NGAP_UEContextReleaseRequest_IEs *> ies;
if (!ue->pduSessions.empty())
{
auto *ieSessionList = asn::New<ASN_NGAP_UEContextReleaseRequest_IEs>();
ieSessionList->id = ASN_NGAP_ProtocolIE_ID_id_PDUSessionResourceListCxtRelReq;
ieSessionList->criticality = ASN_NGAP_Criticality_reject;
ieSessionList->value.present = ASN_NGAP_UEContextReleaseRequest_IEs__value_PR_PDUSessionResourceListCxtRelReq;
for (int psi : ue->pduSessions)
{
auto *sessionItem = asn::New<ASN_NGAP_PDUSessionResourceItemCxtRelReq>();
sessionItem->pDUSessionID = static_cast<ASN_NGAP_PDUSessionID_t>(psi);
asn::SequenceAdd(ieSessionList->value.choice.PDUSessionResourceListCxtRelReq, sessionItem);
}
ies.push_back(ieSessionList);
}
auto *ieCause = asn::New<ASN_NGAP_UEContextReleaseRequest_IEs>();
ieCause->id = ASN_NGAP_ProtocolIE_ID_id_Cause;
ieCause->criticality = ASN_NGAP_Criticality_ignore;
ieCause->value.present = ASN_NGAP_UEContextReleaseRequest_IEs__value_PR_Cause;
ngap_utils::ToCauseAsn_Ref(cause, ieCause->value.choice.Cause);
ies.push_back(ieCause);
auto *pdu = asn::ngap::NewMessagePdu<ASN_NGAP_UEContextReleaseRequest>(ies);
sendNgapUeAssociated(ueId, pdu);
}
} // namespace nr::gnb
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