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/*
* Copyright (C) 2019-2023 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 "sbi-path.h"
#include "ngap-path.h"
#include "binding.h"
#include "namf-handler.h"
bool smf_namf_comm_handle_n1_n2_message_transfer(
smf_sess_t *sess, int state, ogs_sbi_message_t *recvmsg)
{
smf_ue_t *smf_ue = NULL;
OpenAPI_n1_n2_message_transfer_rsp_data_t *N1N2MessageTransferRspData;
ogs_assert(sess);
smf_ue = smf_ue_find_by_id(sess->smf_ue_id);
ogs_assert(smf_ue);
ogs_assert(state);
ogs_assert(recvmsg);
switch (state) {
case SMF_UE_REQUESTED_PDU_SESSION_ESTABLISHMENT:
if (recvmsg->res_status == OGS_SBI_HTTP_STATUS_OK) {
smf_qos_flow_binding(sess);
} else {
ogs_error("[%s:%d] HTTP response error [%d]",
smf_ue->supi, sess->psi, recvmsg->res_status);
}
break;
case SMF_NETWORK_TRIGGERED_SERVICE_REQUEST:
case SMF_NETWORK_REQUESTED_QOS_FLOW_MODIFICATION:
N1N2MessageTransferRspData = recvmsg->N1N2MessageTransferRspData;
if (!N1N2MessageTransferRspData) {
ogs_error("No N1N2MessageTransferRspData [status:%d]",
recvmsg->res_status);
break;
}
if (recvmsg->res_status == OGS_SBI_HTTP_STATUS_OK) {
if (N1N2MessageTransferRspData->cause ==
OpenAPI_n1_n2_message_transfer_cause_N1_N2_TRANSFER_INITIATED) {
/* Nothing */
} else {
ogs_error("Not implemented [cause:%d]",
N1N2MessageTransferRspData->cause);
ogs_assert_if_reached();
}
} else if (recvmsg->res_status == OGS_SBI_HTTP_STATUS_ACCEPTED) {
if (N1N2MessageTransferRspData->cause ==
OpenAPI_n1_n2_message_transfer_cause_ATTEMPTING_TO_REACH_UE) {
if (recvmsg->http.location)
smf_sess_set_paging_n1n2message_location(
sess, recvmsg->http.location);
else
ogs_error("No HTTP Location");
} else {
ogs_error("Not implemented [cause:%d]",
N1N2MessageTransferRspData->cause);
ogs_assert_if_reached();
}
} else {
/*
* TODO:
*
* TS23.502 4.2.3.3 Network Triggered Service Request
*
* 3c. [Conditional] SMF responds to the UPF
*
* If the SMF receives an indication from the AMF that the UE is
* unreachable or reachable only for regulatory prioritized service
* and the SMF determines that Extended Buffering does not apply,
* the SMF may, based on network policies, either:
*
* - indicate to the UPF to stop sending Data Notifications;
* - indicate to the UPF to stop buffering DL data and
* discard the buffered data;
* - indicate to the UPF to stop sending Data Notifications and
* stop buffering DL data and discard the buffered data; or
* - refrains from sending further Namf_Communication_N1N2MessageTransfer
* message for DL data to the AMF while the UE is unreachable.
*/
ogs_error("[%s:%d] HTTP response error [status:%d cause:%d]",
smf_ue->supi, sess->psi, recvmsg->res_status,
N1N2MessageTransferRspData->cause);
}
break;
case SMF_NETWORK_REQUESTED_PDU_SESSION_RELEASE:
case SMF_ERROR_INDICATON_RECEIVED_FROM_5G_AN:
N1N2MessageTransferRspData = recvmsg->N1N2MessageTransferRspData;
if (!N1N2MessageTransferRspData) {
ogs_error("No N1N2MessageTransferRspData [status:%d]",
recvmsg->res_status);
break;
}
if (recvmsg->res_status == OGS_SBI_HTTP_STATUS_ACCEPTED) {
/*
* OpenAPI_n1_n2_message_transfer_cause_ATTEMPTING_TO_REACH_UE and
* HTTP_STATUS_ACCEPTED should be handled here when removing PDU session
* due to the change of PDU Session Anchor.
*
* TS23.502
* 4.3.4 PDU Session Release
* 4.3.4.2 UE or network requested PDU Session Release for Non-Roaming
* and Roaming with Local Breakout
*
* 3b. ...
*
* The "skip indicator" tells the AMF whether it may skip sending
* the N1 SM container to the UE (e.g. when the UE is in CM-IDLE state).
* SMF includes the "skip indicator"
* in the Namf_Communication_N1N2MessageTransfer
* except when the procedure is triggered to change PDU Session Anchor
* of a PDU Session with SSC mode 2.
*
* Related Issue #2396
*/
if (N1N2MessageTransferRspData->cause ==
OpenAPI_n1_n2_message_transfer_cause_ATTEMPTING_TO_REACH_UE) {
/* Nothing */
} else {
ogs_error("Not implemented [cause:%d]",
N1N2MessageTransferRspData->cause);
ogs_assert_if_reached();
}
} else if (recvmsg->res_status == OGS_SBI_HTTP_STATUS_OK) {
if (N1N2MessageTransferRspData->cause ==
OpenAPI_n1_n2_message_transfer_cause_N1_MSG_NOT_TRANSFERRED) {
smf_n1_n2_message_transfer_param_t param;
memset(¶m, 0, sizeof(param));
param.state = SMF_NETWORK_TRIGGERED_SERVICE_REQUEST;
param.n2smbuf =
ngap_build_pdu_session_resource_setup_request_transfer(
sess);
ogs_assert(param.n2smbuf);
param.n1n2_failure_txf_notif_uri = true;
smf_namf_comm_send_n1_n2_message_transfer(sess, ¶m);
} else if (N1N2MessageTransferRspData->cause ==
OpenAPI_n1_n2_message_transfer_cause_N1_N2_TRANSFER_INITIATED) {
/* Nothing */
} else {
ogs_error("Not implemented [cause:%d]",
N1N2MessageTransferRspData->cause);
ogs_assert_if_reached();
}
} else {
ogs_error("[%s:%d] HTTP response error [status:%d cause:%d]",
smf_ue->supi, sess->psi, recvmsg->res_status,
N1N2MessageTransferRspData->cause);
}
break;
default:
ogs_fatal("Unexpected state [%d]", state);
ogs_assert_if_reached();
}
return true;
}
bool smf_namf_comm_handle_n1_n2_message_transfer_failure_notify(
ogs_sbi_stream_t *stream, ogs_sbi_message_t *recvmsg)
{
OpenAPI_n1_n2_msg_txfr_failure_notification_t
*N1N2MsgTxfrFailureNotification = NULL;
smf_sess_t *sess = NULL;
ogs_assert(stream);
ogs_assert(recvmsg);
N1N2MsgTxfrFailureNotification = recvmsg->N1N2MsgTxfrFailureNotification;
if (!N1N2MsgTxfrFailureNotification) {
ogs_error("No N1N2MsgTxfrFailureNotification");
ogs_assert(true ==
ogs_sbi_server_send_error(stream, OGS_SBI_HTTP_STATUS_BAD_REQUEST,
recvmsg, "No N1N2MsgTxfrFailureNotification", NULL, NULL));
return false;
}
if (!N1N2MsgTxfrFailureNotification->cause) {
ogs_error("No Cause");
ogs_assert(true ==
ogs_sbi_server_send_error(stream, OGS_SBI_HTTP_STATUS_BAD_REQUEST,
recvmsg, "No Cause", NULL, NULL));
return false;
}
if (!N1N2MsgTxfrFailureNotification->n1n2_msg_data_uri) {
ogs_error("No n1n2MsgDataUri");
ogs_assert(true ==
ogs_sbi_server_send_error(stream, OGS_SBI_HTTP_STATUS_BAD_REQUEST,
recvmsg, "No n1n2MsgDataUri", NULL, NULL));
return false;
}
sess = smf_sess_find_by_paging_n1n2message_location(
N1N2MsgTxfrFailureNotification->n1n2_msg_data_uri);
if (!sess) {
ogs_error("Not found");
ogs_assert(true ==
ogs_sbi_server_send_error(stream, OGS_SBI_HTTP_STATUS_NOT_FOUND,
recvmsg, N1N2MsgTxfrFailureNotification->n1n2_msg_data_uri,
NULL, NULL));
return false;
}
/*
* TODO:
*
* TS23.502 4.2.3.3 Network Triggered Service Request
*
* 5. [Conditional] AMF to SMF:
* Namf_Communication_N1N2Transfer Failure Notification.
*
* When a Namf_Communication_N1N2Transfer Failure Notification
* is received, SMF informs the UPF (if applicable).
*
* Procedure for pause of charging at SMF is specified in clause 4.4.4.
*/
ogs_assert(true == ogs_sbi_send_http_status_no_content(stream));
return true;
}
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