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open5gs/src/amf/nas-path.c

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/*
* Copyright (C) 2019,2020 by Sukchan Lee <acetcom@gmail.com>
*
* This file is part of Open5GS.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "ngap-path.h"
#include "ngap-build.h"
#include "gmm-build.h"
#include "nas-path.h"
int nas_5gs_send_to_gnb(amf_ue_t *amf_ue, ogs_pkbuf_t *pkbuf)
{
int rv;
ogs_assert(pkbuf);
amf_ue = amf_ue_cycle(amf_ue);
if (!amf_ue) {
ogs_error("UE(amf-ue) context has already been removed");
ogs_pkbuf_free(pkbuf);
return OGS_NOTFOUND;
}
rv = ngap_send_to_ran_ue(amf_ue->ran_ue, pkbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_5gs_send_to_downlink_nas_transport(
ran_ue_t *ran_ue, ogs_pkbuf_t *pkbuf)
{
int rv;
ogs_pkbuf_t *ngapbuf = NULL;
ogs_assert(ran_ue_cycle(ran_ue));
ogs_assert(pkbuf);
ngapbuf = ngap_build_downlink_nas_transport(ran_ue, pkbuf, false, false);
if (!ngapbuf) {
ogs_error("ngap_build_downlink_nas_transport() failed");
return OGS_ERROR;
}
rv = ngap_send_to_ran_ue(ran_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_5gs_send_registration_accept(amf_ue_t *amf_ue)
{
int rv;
bool transfer_needed = false;
ran_ue_t *ran_ue = NULL;
ogs_pkbuf_t *ngapbuf = NULL;
ogs_pkbuf_t *gmmbuf = NULL;
if (!amf_ue_cycle(amf_ue)) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
ran_ue = ran_ue_cycle(amf_ue->ran_ue);
if (!ran_ue) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ogs_debug("[%s] Registration accept", amf_ue->supi);
if (amf_ue->next.m_tmsi) {
if (amf_ue->t3550.pkbuf) {
gmmbuf = amf_ue->t3550.pkbuf;
} else {
gmmbuf = gmm_build_registration_accept(amf_ue);
if (!gmmbuf) {
ogs_error("gmm_build_registration_accept() failed");
return OGS_ERROR;
}
}
amf_ue->t3550.pkbuf = ogs_pkbuf_copy(gmmbuf);
if (!amf_ue->t3550.pkbuf) {
ogs_error("ogs_pkbuf_copy(amf_ue->t3550.pkbuf) failed");
ogs_pkbuf_free(gmmbuf);
return OGS_ERROR;
}
ogs_timer_start(amf_ue->t3550.timer,
amf_timer_cfg(AMF_TIMER_T3550)->duration);
} else {
gmmbuf = gmm_build_registration_accept(amf_ue);
if (!gmmbuf) {
ogs_error("gmm_build_registration_accept() failed");
return OGS_ERROR;
}
}
/*
* Previously, AMF would sends PDUSessionResourceSetupRequest
* when the following conditions were met:
* - gNB didn't send UE Context Request IE of InitialUEMessage
* - AMF should send SMF generated TRANSFER message(PDU_RES_SETUP_REQ)
* to the gNB
*
* However, in issues #771, the gNB did not accept
* PDUSessionResourceSetupRequest. Perhaps the gNB engineer thought
* that if gNB needs to send data traffic to the UE, AMF should send
* an InitialContextSetupRequest regardless of UE Context Request IE.
* This is because gNB requires the kgNB security context
* for data connection.
*
* So, in this case, Open5GS-AMF decided to send
* an InitialContexSetupRequest regardless of
* whether it received UE Context Request IE of InitialUEMessage.
*/
transfer_needed = PDU_RES_SETUP_REQ_TRANSFER_NEEDED(amf_ue);
if (ran_ue->initial_context_setup_request_sent == false &&
(ran_ue->ue_context_requested == true || transfer_needed == true)) {
ngapbuf = ngap_ue_build_initial_context_setup_request(amf_ue, gmmbuf);
if (!ngapbuf) {
ogs_error("ngap_ue_build_initial_context_setup_request() failed");
return OGS_ERROR;
}
rv = nas_5gs_send_to_gnb(amf_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
ran_ue->initial_context_setup_request_sent = true;
} else {
if (transfer_needed == true) {
ngapbuf = ngap_ue_build_pdu_session_resource_setup_request(
amf_ue, gmmbuf);
if (!ngapbuf) {
ogs_error("ngap_ue_build_pdu_session_resource_setup_request()"
" failed");
return OGS_ERROR;
}
rv = nas_5gs_send_to_gnb(amf_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
} else {
ngapbuf = ngap_build_downlink_nas_transport(
ran_ue, gmmbuf, true, true);
if (!ngapbuf) {
ogs_error("ngap_build_downlink_nas_transport() failed");
return OGS_ERROR;
}
rv = nas_5gs_send_to_gnb(amf_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
}
}
return rv;
}
int nas_5gs_send_registration_reject(
ran_ue_t *ran_ue, amf_ue_t *amf_ue, ogs_nas_5gmm_cause_t gmm_cause)
{
int rv;
ogs_pkbuf_t *gmmbuf = NULL;
ogs_assert(ran_ue_cycle(ran_ue));
ogs_assert(amf_ue_cycle(amf_ue));
switch (amf_ue->nas.registration.value) {
case OGS_NAS_5GS_REGISTRATION_TYPE_INITIAL:
amf_metrics_inst_by_cause_add(gmm_cause,
AMF_METR_CTR_RM_REG_INIT_FAIL, 1);
break;
case OGS_NAS_5GS_REGISTRATION_TYPE_MOBILITY_UPDATING:
amf_metrics_inst_by_cause_add(gmm_cause,
AMF_METR_CTR_RM_REG_MOB_FAIL, 1);
break;
case OGS_NAS_5GS_REGISTRATION_TYPE_PERIODIC_UPDATING:
amf_metrics_inst_by_cause_add(gmm_cause,
AMF_METR_CTR_RM_REG_PERIOD_FAIL, 1);
break;
case OGS_NAS_5GS_REGISTRATION_TYPE_EMERGENCY:
amf_metrics_inst_by_cause_add(gmm_cause,
AMF_METR_CTR_RM_REG_EMERG_FAIL, 1);
break;
default:
ogs_error("Unknown reg_type[%d]",
amf_ue->nas.registration.value);
}
ogs_warn("[%s] Registration reject [%d]", amf_ue->suci, gmm_cause);
gmmbuf = gmm_build_registration_reject(amf_ue, gmm_cause);
if (!gmmbuf) {
ogs_error("gmm_build_registration_reject() failed");
return OGS_ERROR;
}
rv = nas_5gs_send_to_downlink_nas_transport(ran_ue, gmmbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_5gs_send_service_accept(amf_ue_t *amf_ue)
{
int rv;
bool transfer_needed = false;
ran_ue_t *ran_ue = NULL;
ogs_pkbuf_t *gmmbuf = NULL;
ogs_pkbuf_t *ngapbuf = NULL;
if (!amf_ue_cycle(amf_ue)) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
ran_ue = ran_ue_cycle(amf_ue->ran_ue);
if (!ran_ue) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ogs_debug("[%s] Service accept", amf_ue->supi);
gmmbuf = gmm_build_service_accept(amf_ue);
if (!gmmbuf) {
ogs_error("gmm_build_registration_reject() failed");
return OGS_ERROR;
}
/*
* Previously, AMF would sends PDUSessionResourceSetupRequest
* when the following conditions were met:
* - gNB didn't send UE Context Request IE of InitialUEMessage
* - AMF should send SMF generated TRANSFER message(PDU_RES_SETUP_REQ)
* to the gNB
*
* However, in issues #771, the gNB did not accept
* PDUSessionResourceSetupRequest. Perhaps the gNB engineer thought
* that if gNB needs to send data traffic to the UE, AMF should send
* an InitialContextSetupRequest regardless of UE Context Request IE.
* This is because gNB requires the kgNB security context
* for data connection.
*
* So, in this case, Open5GS-AMF decided to send
* an InitialContexSetupRequest regardless of
* whether it received UE Context Request IE of InitialUEMessage.
*/
transfer_needed = PDU_RES_SETUP_REQ_TRANSFER_NEEDED(amf_ue);
if (ran_ue->initial_context_setup_request_sent == false &&
(ran_ue->ue_context_requested == true || transfer_needed == true)) {
ngapbuf = ngap_ue_build_initial_context_setup_request(amf_ue, gmmbuf);
if (!ngapbuf) {
ogs_error("ngap_ue_build_initial_context_setup_request() failed");
return OGS_ERROR;
}
rv = nas_5gs_send_to_gnb(amf_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
ran_ue->initial_context_setup_request_sent = true;
} else {
if (transfer_needed == true) {
ngapbuf = ngap_ue_build_pdu_session_resource_setup_request(
amf_ue, gmmbuf);
if (!ngapbuf) {
ogs_error("ngap_ue_build_pdu_session_resource_setup_request()"
" failed");
return OGS_ERROR;
}
rv = nas_5gs_send_to_gnb(amf_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
} else {
rv = nas_5gs_send_to_downlink_nas_transport(amf_ue->ran_ue, gmmbuf);
ogs_expect(rv == OGS_OK);
}
}
return rv;
}
int nas_5gs_send_service_reject(
ran_ue_t *ran_ue, amf_ue_t *amf_ue, ogs_nas_5gmm_cause_t gmm_cause)
{
int rv;
ogs_pkbuf_t *gmmbuf = NULL;
ogs_assert(ran_ue_cycle(ran_ue));
ogs_assert(amf_ue_cycle(amf_ue));
ogs_debug("[%s] Service reject", amf_ue->supi);
gmmbuf = gmm_build_service_reject(amf_ue, gmm_cause);
if (!gmmbuf) {
ogs_error("gmm_build_registration_reject() failed");
return OGS_ERROR;
}
rv = nas_5gs_send_to_downlink_nas_transport(ran_ue, gmmbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_5gs_send_de_registration_accept(amf_ue_t *amf_ue)
{
int rv;
ran_ue_t *ran_ue = NULL;
ogs_pkbuf_t *gmmbuf = NULL;
if (!amf_ue_cycle(amf_ue)) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
ran_ue = ran_ue_cycle(amf_ue->ran_ue);
if (!ran_ue) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ogs_debug("[%s] De-registration accept", amf_ue->supi);
if (amf_ue->nas.de_registration.switch_off == 0) {
int rv;
gmmbuf = gmm_build_de_registration_accept(amf_ue);
if (!gmmbuf) {
ogs_error("gmm_build_registration_reject() failed");
return OGS_ERROR;
}
rv = nas_5gs_send_to_downlink_nas_transport(amf_ue->ran_ue, gmmbuf);
if (rv != OGS_OK) {
ogs_error("nas_5gs_send_to_downlink_nas_transport() failed");
return rv;
}
}
rv = ngap_send_ran_ue_context_release_command(ran_ue,
NGAP_Cause_PR_nas, NGAP_CauseNas_deregister,
NGAP_UE_CTX_REL_NG_REMOVE_AND_UNLINK, 0);
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_5gs_send_de_registration_request(
amf_ue_t *amf_ue,
OpenAPI_deregistration_reason_e dereg_reason,
ogs_nas_5gmm_cause_t gmm_cause)
{
int rv;
ran_ue_t *ran_ue = NULL;
ogs_pkbuf_t *gmmbuf = NULL;
if (!amf_ue_cycle(amf_ue)) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
ran_ue = ran_ue_cycle(amf_ue->ran_ue);
if (!ran_ue) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ogs_debug("[%s] De-registration request", amf_ue->supi);
if (amf_ue->t3522.pkbuf) {
gmmbuf = amf_ue->t3522.pkbuf;
} else {
gmmbuf = gmm_build_de_registration_request(
amf_ue, dereg_reason, gmm_cause);
if (!gmmbuf) {
ogs_error("gmm_build_de_registration_request() failed");
return OGS_ERROR;
}
}
amf_ue->t3522.pkbuf = ogs_pkbuf_copy(gmmbuf);
if (!amf_ue->t3522.pkbuf) {
ogs_error("ogs_pkbuf_copy(amf_ue->t3522.pkbuf) failed");
ogs_pkbuf_free(gmmbuf);
return OGS_ERROR;
}
ogs_timer_start(amf_ue->t3522.timer,
amf_timer_cfg(AMF_TIMER_T3522)->duration);
rv = nas_5gs_send_to_downlink_nas_transport(amf_ue->ran_ue, gmmbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_5gs_send_identity_request(amf_ue_t *amf_ue)
{
int rv;
ogs_pkbuf_t *gmmbuf = NULL;
if (!amf_ue_cycle(amf_ue)) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
if (!ran_ue_cycle(amf_ue->ran_ue)) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ogs_debug("Identity request");
if (amf_ue->t3570.pkbuf) {
gmmbuf = amf_ue->t3570.pkbuf;
} else {
gmmbuf = gmm_build_identity_request(amf_ue);
if (!gmmbuf) {
ogs_error("gmm_build_identity_request() failed");
return OGS_ERROR;
}
}
amf_ue->t3570.pkbuf = ogs_pkbuf_copy(gmmbuf);
if (!amf_ue->t3570.pkbuf) {
ogs_error("ogs_pkbuf_copy(amf_ue->t3570.pkbuf) failed");
ogs_pkbuf_free(gmmbuf);
return OGS_ERROR;
}
ogs_timer_start(amf_ue->t3570.timer,
amf_timer_cfg(AMF_TIMER_T3570)->duration);
rv = nas_5gs_send_to_downlink_nas_transport(amf_ue->ran_ue, gmmbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_5gs_send_authentication_request(amf_ue_t *amf_ue)
{
int rv;
ogs_pkbuf_t *gmmbuf = NULL;
if (!amf_ue_cycle(amf_ue)) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
if (!ran_ue_cycle(amf_ue->ran_ue)) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ogs_debug("[%s] Authentication request", amf_ue->suci);
if (amf_ue->t3560.pkbuf) {
gmmbuf = amf_ue->t3560.pkbuf;
} else {
gmmbuf = gmm_build_authentication_request(amf_ue);
if (!gmmbuf) {
ogs_error("gmm_build_authentication_request() failed");
return OGS_ERROR;
}
}
amf_ue->t3560.pkbuf = ogs_pkbuf_copy(gmmbuf);
if (!amf_ue->t3560.pkbuf) {
ogs_error("ogs_pkbuf_copy(amf_ue->t3560.pkbuf) failed");
ogs_pkbuf_free(gmmbuf);
return OGS_ERROR;
}
ogs_timer_start(amf_ue->t3560.timer,
amf_timer_cfg(AMF_TIMER_T3560)->duration);
amf_metrics_inst_global_inc(AMF_METR_GLOB_CTR_AMF_AUTH_REQ);
rv = nas_5gs_send_to_downlink_nas_transport(amf_ue->ran_ue, gmmbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_5gs_send_authentication_reject(amf_ue_t *amf_ue)
{
int rv;
ogs_pkbuf_t *gmmbuf = NULL;
if (!amf_ue_cycle(amf_ue)) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
if (!ran_ue_cycle(amf_ue->ran_ue)) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ogs_warn("[%s] Authentication reject", amf_ue->suci);
gmmbuf = gmm_build_authentication_reject();
if (!gmmbuf) {
ogs_error("gmm_build_authentication_reject() failed");
return OGS_ERROR;
}
amf_metrics_inst_global_inc(AMF_METR_GLOB_CTR_AMF_AUTH_REJECT);
rv = nas_5gs_send_to_downlink_nas_transport(amf_ue->ran_ue, gmmbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_5gs_send_security_mode_command(amf_ue_t *amf_ue)
{
int rv;
ogs_pkbuf_t *gmmbuf = NULL;
if (!amf_ue_cycle(amf_ue)) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
if (!ran_ue_cycle(amf_ue->ran_ue)) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ogs_debug("[%s] Security mode command", amf_ue->supi);
if (amf_ue->t3560.pkbuf) {
gmmbuf = amf_ue->t3560.pkbuf;
} else {
gmmbuf = gmm_build_security_mode_command(amf_ue);
if (!gmmbuf) {
ogs_error("gmm_build_security_mode_command() failed");
return OGS_ERROR;
}
}
amf_ue->t3560.pkbuf = ogs_pkbuf_copy(gmmbuf);
if (!amf_ue->t3560.pkbuf) {
ogs_error("ogs_pkbuf_copy(amf_ue->t3560.pkbuf) failed");
ogs_pkbuf_free(gmmbuf);
return OGS_ERROR;
}
ogs_timer_start(amf_ue->t3560.timer,
amf_timer_cfg(AMF_TIMER_T3560)->duration);
rv = nas_5gs_send_to_downlink_nas_transport(amf_ue->ran_ue, gmmbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_5gs_send_configuration_update_command(
amf_ue_t *amf_ue, gmm_configuration_update_command_param_t *param)
{
int rv;
ogs_pkbuf_t *gmmbuf = NULL;
if (!amf_ue_cycle(amf_ue)) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
if (!ran_ue_cycle(amf_ue->ran_ue)) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ogs_info("[%s] Configuration update command", amf_ue->supi);
if (amf_ue->t3555.pkbuf) {
gmmbuf = amf_ue->t3555.pkbuf;
amf_ue->t3555.pkbuf = ogs_pkbuf_copy(gmmbuf);
if (!amf_ue->t3555.pkbuf) {
ogs_error("ogs_pkbuf_copy(amf_ue->t3555.pkbuf) failed");
ogs_pkbuf_free(gmmbuf);
return OGS_ERROR;
}
ogs_timer_start(amf_ue->t3555.timer,
amf_timer_cfg(AMF_TIMER_T3555)->duration);
} else {
if (!param) {
ogs_error("No param");
return OGS_ERROR;
}
gmmbuf = gmm_build_configuration_update_command(amf_ue, param);
if (!gmmbuf) {
ogs_error("gmm_build_configuration_update_command() failed");
return OGS_ERROR;
}
if (param->acknowledgement_requested) {
amf_ue->t3555.pkbuf = ogs_pkbuf_copy(gmmbuf);
if (!amf_ue->t3555.pkbuf) {
ogs_error("ogs_pkbuf_copy(amf_ue->t3555.pkbuf) failed");
ogs_pkbuf_free(gmmbuf);
return OGS_ERROR;
}
ogs_timer_start(amf_ue->t3555.timer,
amf_timer_cfg(AMF_TIMER_T3555)->duration);
}
}
amf_metrics_inst_global_inc(AMF_METR_GLOB_CTR_MM_CONF_UPDATE);
rv = nas_5gs_send_to_downlink_nas_transport(amf_ue->ran_ue, gmmbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_send_pdu_session_setup_request(amf_sess_t *sess,
ogs_pkbuf_t *n1smbuf, ogs_pkbuf_t *n2smbuf)
{
int rv;
amf_ue_t *amf_ue = NULL;
ran_ue_t *ran_ue = NULL;
ogs_pkbuf_t *gmmbuf = NULL;
ogs_pkbuf_t *ngapbuf = NULL;
ogs_assert(sess);
amf_ue = amf_ue_cycle(sess->amf_ue);
if (!amf_ue) {
ogs_error("UE(amf-ue) context has already been removed");
if (n1smbuf) ogs_pkbuf_free(n1smbuf);
ogs_pkbuf_free(n2smbuf);
return OGS_NOTFOUND;
}
ran_ue = ran_ue_cycle(amf_ue->ran_ue);
if (!ran_ue) {
ogs_warn("NG context has already been removed");
if (n1smbuf) ogs_pkbuf_free(n1smbuf);
ogs_pkbuf_free(n2smbuf);
return OGS_NOTFOUND;
}
if (n1smbuf) {
gmmbuf = gmm_build_dl_nas_transport(sess,
OGS_NAS_PAYLOAD_CONTAINER_N1_SM_INFORMATION, n1smbuf, 0, 0);
if (!gmmbuf) {
ogs_error("gmm_build_dl_nas_transport() failed");
return OGS_ERROR;
}
}
if (ran_ue->ue_context_requested == true &&
ran_ue->initial_context_setup_request_sent == false) {
ngapbuf = ngap_sess_build_initial_context_setup_request(
ran_ue, sess, gmmbuf, n2smbuf);
if (!ngapbuf) {
ogs_error("ngap_sess_build_initial_context_setup_request() failed");
return OGS_ERROR;
}
rv = ngap_send_to_ran_ue(ran_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
ran_ue->initial_context_setup_request_sent = true;
} else {
ngapbuf = ngap_sess_build_pdu_session_resource_setup_request(
ran_ue, sess, gmmbuf, n2smbuf);
if (!ngapbuf) {
ogs_error("ngap_sess_build_initial_context_setup_request() failed");
return OGS_ERROR;
}
rv = ngap_send_to_ran_ue(ran_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
}
return rv;
}
int nas_send_pdu_session_modification_command(amf_sess_t *sess,
ogs_pkbuf_t *n1smbuf, ogs_pkbuf_t *n2smbuf)
{
int rv;
amf_ue_t *amf_ue = NULL;
ran_ue_t *ran_ue = NULL;
ogs_pkbuf_t *gmmbuf = NULL;
ogs_pkbuf_t *ngapbuf = NULL;
ogs_assert(sess);
amf_ue = amf_ue_cycle(sess->amf_ue);
if (!amf_ue) {
ogs_error("UE(amf-ue) context has already been removed");
if (n1smbuf) ogs_pkbuf_free(n1smbuf);
ogs_pkbuf_free(n2smbuf);
return OGS_NOTFOUND;
}
ran_ue = ran_ue_cycle(amf_ue->ran_ue);
if (!ran_ue) {
ogs_warn("[%s] NG context has already been removed", amf_ue->supi);
if (n1smbuf) ogs_pkbuf_free(n1smbuf);
ogs_pkbuf_free(n2smbuf);
return OGS_NOTFOUND;
}
if (n1smbuf) {
gmmbuf = gmm_build_dl_nas_transport(sess,
OGS_NAS_PAYLOAD_CONTAINER_N1_SM_INFORMATION, n1smbuf, 0, 0);
if (!gmmbuf) {
ogs_error("gmm_build_dl_nas_transport() failed");
return OGS_ERROR;
}
}
/*
* Issues #1925
*
* We should not check an activated PSI mask to send DownlinkNASTransport.
*
* PDUSessionResourceModifyRequest needs to activate QoSFlow with
* AddOrModifyQosFlow in the message.
*
* So, we should always use PDUSessionResourceModifyRequest instead of
* send with DownlinkNASTransport.
*/
ngapbuf = ngap_build_pdu_session_resource_modify_request(
sess, gmmbuf, n2smbuf);
if (!ngapbuf) {
ogs_error("ngap_build_pdu_session_resource_modify_request() failed");
return OGS_ERROR;
}
rv = nas_5gs_send_to_gnb(amf_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_send_pdu_session_release_command(amf_sess_t *sess,
ogs_pkbuf_t *n1smbuf, ogs_pkbuf_t *n2smbuf)
{
int rv;
amf_ue_t *amf_ue = NULL;
ran_ue_t *ran_ue = NULL;
ogs_pkbuf_t *gmmbuf = NULL;
ogs_pkbuf_t *ngapbuf = NULL;
ogs_assert(n2smbuf);
ogs_assert(sess);
amf_ue = amf_ue_cycle(sess->amf_ue);
if (!amf_ue) {
ogs_error("UE(amf-ue) context has already been removed");
if (n1smbuf) ogs_pkbuf_free(n1smbuf);
ogs_pkbuf_free(n2smbuf);
return OGS_NOTFOUND;
}
ran_ue = ran_ue_cycle(amf_ue->ran_ue);
if (!ran_ue) {
ogs_warn("NG context has already been removed");
if (n1smbuf) ogs_pkbuf_free(n1smbuf);
ogs_pkbuf_free(n2smbuf);
return OGS_NOTFOUND;
}
if (n1smbuf) {
gmmbuf = gmm_build_dl_nas_transport(sess,
OGS_NAS_PAYLOAD_CONTAINER_N1_SM_INFORMATION, n1smbuf, 0, 0);
if (!gmmbuf) {
ogs_error("gmm_build_dl_nas_transport() failed");
return OGS_ERROR;
}
}
/*
* Issues #1925
*
* We should CHECK an activated PSI mask to send DownlinkNASTransport.
*
* - RAN removed the PDU Session Resource in the following process..
* 1. UEContextReleaseRequest
* 2. UEContextReleaseCommand
* 3. UEContextReleaseComplete.
*
* - If Service Request has no UpdateDataStatus while waking up UE,
* 1. ServiceRequest
* 2. InitialContextSetupRequest
* 3. InitialContextSetupResponse
*
* - In this case, we should use the DownlinkNASTransport.
* instead of PDUSessionResourceReleaseCommand
*/
if (ran_ue->psimask.activated & (1 << sess->psi)) {
ngapbuf = ngap_build_pdu_session_resource_release_command(
sess, gmmbuf, n2smbuf);
if (!ngapbuf) {
ogs_error(
"ngap_build_pdu_session_resource_release_command() failed");
return OGS_ERROR;
}
rv = nas_5gs_send_to_gnb(amf_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
} else if (gmmbuf) {
ogs_pkbuf_free(n2smbuf);
ngapbuf = ngap_build_downlink_nas_transport(
ran_ue, gmmbuf, false, false);
if (!ngapbuf) {
ogs_error("ngap_build_downlink_nas_transport() failed");
return OGS_ERROR;
}
rv = nas_5gs_send_to_gnb(amf_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
} else {
/*
* TS23.527
* 5.3 Restoration Procedures upon Loss of GTP-U contexts
* 5.3.2 Procedure for GTP-U Error Indication received from 5G-AN
*
* 1. gNB sent TP-U Error Indication to the UPF.
* 2. UPF sent PFCP Report to SMF.
* 3. SMF sent N1N2Transfer to AMF to release PDU Session
* 4. In AMF, there is no Activated Session.
*
* Since AMF does not yet have an activated PDU Session,
* it ignores it without requesting PDU release from gNB.
*/
ogs_error("No session and N1 message");
ogs_error(" ACTIVATED[0x%x] N1[%p], SUPI[%s] PSI[%d]",
ran_ue->psimask.activated, gmmbuf, amf_ue->supi, sess->psi);
ogs_pkbuf_free(n2smbuf);
rv = OGS_OK;
}
return rv;
}
int nas_5gs_send_gmm_status(amf_ue_t *amf_ue, ogs_nas_5gmm_cause_t cause)
{
int rv;
ogs_pkbuf_t *gmmbuf = NULL;
if (!amf_ue_cycle(amf_ue)) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
if (!ran_ue_cycle(amf_ue->ran_ue)) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ogs_debug("[%s] 5GMM status", amf_ue->supi);
gmmbuf = gmm_build_status(amf_ue, cause);
if (!gmmbuf) {
ogs_error("gmm_build_status() failed");
return OGS_ERROR;
}
rv = nas_5gs_send_to_downlink_nas_transport(amf_ue->ran_ue, gmmbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_5gs_send_gmm_reject(
ran_ue_t *ran_ue, amf_ue_t *amf_ue, ogs_nas_5gmm_cause_t gmm_cause)
{
int rv;
amf_ue = amf_ue_cycle(amf_ue);
if (!amf_ue) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
ran_ue = ran_ue_cycle(ran_ue);
if (!ran_ue) {
ogs_error("[%s] NG context has already been removed", amf_ue->supi);
return OGS_NOTFOUND;
}
switch(amf_ue->nas.message_type) {
case OGS_NAS_5GS_REGISTRATION_REQUEST:
rv = nas_5gs_send_registration_reject(ran_ue, amf_ue, gmm_cause);
ogs_expect(rv == OGS_OK);
break;
case OGS_NAS_5GS_SERVICE_REQUEST:
rv = nas_5gs_send_service_reject(ran_ue, amf_ue, gmm_cause);
ogs_expect(rv == OGS_OK);
break;
default:
ogs_error("Unknown message type [%d]", amf_ue->nas.message_type);
rv = OGS_ERROR;
}
return rv;
}
static ogs_nas_5gmm_cause_t gmm_cause_from_sbi(int status)
{
ogs_nas_5gmm_cause_t gmm_cause;
switch(status) {
case OGS_SBI_HTTP_STATUS_NOT_FOUND:
gmm_cause = OGS_5GMM_CAUSE_PLMN_NOT_ALLOWED;
break;
case OGS_SBI_HTTP_STATUS_GATEWAY_TIMEOUT:
gmm_cause = OGS_5GMM_CAUSE_PAYLOAD_WAS_NOT_FORWARDED;
break;
case OGS_SBI_HTTP_STATUS_BAD_REQUEST:
gmm_cause = OGS_5GMM_CAUSE_SEMANTICALLY_INCORRECT_MESSAGE;
break;
case OGS_SBI_HTTP_STATUS_INTERNAL_SERVER_ERROR:
gmm_cause =
OGS_5GMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK;
break;
default:
gmm_cause = OGS_5GMM_CAUSE_PROTOCOL_ERROR_UNSPECIFIED;
}
return gmm_cause;
}
int nas_5gs_send_gmm_reject_from_sbi(amf_ue_t *amf_ue, int status)
{
int rv;
ogs_assert(amf_ue);
rv = nas_5gs_send_gmm_reject(
amf_ue->ran_ue, amf_ue, gmm_cause_from_sbi(status));
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_5gs_send_dl_nas_transport(ran_ue_t *ran_ue, amf_sess_t *sess,
uint8_t payload_container_type, ogs_pkbuf_t *payload_container,
ogs_nas_5gmm_cause_t cause, uint8_t backoff_time)
{
int rv;
ogs_pkbuf_t *gmmbuf = NULL;
amf_ue_t *amf_ue = NULL;
ogs_assert(sess);
sess = amf_sess_cycle(sess);
if (!sess) {
ogs_error("Session has already been removed");
return OGS_NOTFOUND;
}
amf_ue = amf_ue_cycle(sess->amf_ue);
if (!amf_ue) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
ran_ue = ran_ue_cycle(ran_ue);
if (!ran_ue) {
ogs_error("[%s] NG context has already been removed", amf_ue->supi);
return OGS_NOTFOUND;
}
ogs_assert(payload_container_type);
ogs_assert(payload_container);
ogs_warn("[%s] DL NAS transport", amf_ue->suci);
gmmbuf = gmm_build_dl_nas_transport(sess,
payload_container_type, payload_container, cause, backoff_time);
if (!gmmbuf) {
ogs_error("gmm_build_dl_nas_transport() failed");
return OGS_ERROR;
}
rv = nas_5gs_send_to_downlink_nas_transport(ran_ue, gmmbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
/*
* TS24.501
* 8.2.11 DL NAS transport
* 8.2.11.4 5GMM cause
*
* The AMF shall include this IE when the Payload container IE
* contains an uplink payload which was not forwarded and
* the Payload container type IE is not set to "Multiple payloads".
*
* -0-
* As such, this function 'nas_5gs_send_gsm_reject()' must be used
* only when an N1 SM message has been forwarded to the SMF.
*/
int nas_5gs_send_gsm_reject(ran_ue_t *ran_ue, amf_sess_t *sess,
uint8_t payload_container_type, ogs_pkbuf_t *payload_container)
{
int rv;
amf_ue_t *amf_ue = NULL;
ogs_assert(sess);
sess = amf_sess_cycle(sess);
if (!sess) {
ogs_error("Session has already been removed");
return OGS_NOTFOUND;
}
amf_ue = amf_ue_cycle(sess->amf_ue);
if (!amf_ue) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
ran_ue = ran_ue_cycle(ran_ue);
if (!ran_ue) {
ogs_error("[%s] NG context has already been removed", amf_ue->supi);
return OGS_NOTFOUND;
}
ogs_assert(payload_container_type);
ogs_assert(payload_container);
rv = nas_5gs_send_dl_nas_transport(
ran_ue, sess, payload_container_type, payload_container, 0, 0);
ogs_expect(rv == OGS_OK);
return rv;
}
int nas_5gs_send_back_gsm_message(
ran_ue_t *ran_ue, amf_sess_t *sess,
ogs_nas_5gmm_cause_t cause, uint8_t backoff_time)
{
int rv;
ogs_pkbuf_t *pbuf = NULL;
amf_ue_t *amf_ue = NULL;
ogs_assert(sess);
sess = amf_sess_cycle(sess);
if (!sess) {
ogs_error("Session has already been removed");
return OGS_NOTFOUND;
}
amf_ue = amf_ue_cycle(sess->amf_ue);
if (!amf_ue) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
ran_ue = ran_ue_cycle(ran_ue);
if (!ran_ue) {
ogs_error("[%s] NG context has already been removed", amf_ue->supi);
return OGS_NOTFOUND;
}
ogs_assert(sess->payload_container_type);
ogs_assert(sess->payload_container);
pbuf = ogs_pkbuf_copy(sess->payload_container);
if (!pbuf) {
ogs_error("ogs_pkbuf_copy(pbuf) failed");
return OGS_ERROR;
}
rv = nas_5gs_send_dl_nas_transport(
ran_ue, sess, sess->payload_container_type, pbuf,
cause, backoff_time);
ogs_expect(rv == OGS_OK);
return rv;
}
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