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/*
* Copyright (C) 2019 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 "s1ap-path.h"
#include "nas-path.h"
#include "sgsap-path.h"
#include "mme-gtp-path.h"
#include "mme-path.h"
#include "mme-fd-path.h"
#include "mme-sm.h"
void mme_send_delete_session_or_detach(mme_ue_t *mme_ue)
{
int r, xact_count;
ogs_assert(mme_ue);
xact_count = mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR);
switch (mme_ue->detach_type) {
case MME_DETACH_TYPE_REQUEST_FROM_UE:
ogs_debug("Detach Request from UE");
mme_gtp_send_delete_all_sessions(
mme_ue, OGS_GTP_DELETE_SEND_DETACH_ACCEPT);
if (!MME_SESSION_RELEASE_PENDING(mme_ue) &&
mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR) ==
xact_count) {
r = nas_eps_send_detach_accept(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
break;
/* MME Explicit Detach, ie: O&M Procedures */
case MME_DETACH_TYPE_MME_EXPLICIT:
ogs_fatal("Not Implemented : MME_DETACH_TYPE_MME_EXPLICIT");
ogs_assert_if_reached();
break;
/* HSS Explicit Detach, ie: Subscription Withdrawl Cancel Location
*
* TS23.401 - V16.10.0
* Ch 5.3.8 Detach procedure
* Ch 5.3.8.4 HSS-initiated Detach procedure
*/
case MME_DETACH_TYPE_HSS_EXPLICIT:
ogs_debug("Explicit HSS Detach");
mme_gtp_send_delete_all_sessions(mme_ue, OGS_GTP_DELETE_NO_ACTION);
break;
/* MME Implicit Detach, ie: Lost Communication
* TS23.401 - V16.10.0
* Ch 5.3.8.3 MME-initiated Detach procedure (Without Step 1)
*/
case MME_DETACH_TYPE_MME_IMPLICIT:
ogs_warn("[%s] Implicit MME Detach", mme_ue->imsi_bcd);
mme_gtp_send_delete_all_sessions(mme_ue,
OGS_GTP_DELETE_SEND_RELEASE_WITH_UE_CONTEXT_REMOVE);
if (!MME_SESSION_RELEASE_PENDING(mme_ue) &&
mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR) ==
xact_count) {
enb_ue_t *enb_ue = enb_ue_find_by_id(mme_ue->enb_ue_id);
if (enb_ue) {
ogs_warn("[%s] UEContextReleaseCommand Sent", mme_ue->imsi_bcd);
ogs_assert(OGS_OK ==
s1ap_send_ue_context_release_command(enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0));
} else {
ogs_warn("[%s] MME-UE Context Removed", mme_ue->imsi_bcd);
mme_ue_remove(mme_ue);
}
}
break;
/* HSS Implicit Detach, ie: MME-UPDATE-PROCEDURE
*
* TS23.401 - V16.10.0
* Ch 5.3.2 Attach procedure
* Ch 5.3.2.1 E-UTRAN Initial Attach
*
* 9. The HSS sends Cancel Location (IMSI, Cancellation Type)
* to the old MME. The old MME acknowledges with Cancel Location Ack (IMSI)
* and removes the MM and bearer contexts. If the ULR-Flags indicates
* "Initial-Attach-Indicator" and the HSS has the SGSN registration,
* then the HSS sends Cancel Location (IMSI, Cancellation Type)
* to the old SGSN. The Cancellation Type indicates the old MME/SGSN
* to release the old Serving GW resource.
*/
case MME_DETACH_TYPE_HSS_IMPLICIT:
ogs_debug("Implicit HSS Detach");
mme_gtp_send_delete_all_sessions(mme_ue,
OGS_GTP_DELETE_SEND_RELEASE_WITH_UE_CONTEXT_REMOVE);
break;
default:
ogs_fatal(" Invalid OGS_NAS_EPS TYPE[%d]", mme_ue->detach_type);
ogs_assert_if_reached();
}
}
void mme_send_delete_session_or_mme_ue_context_release(mme_ue_t *mme_ue)
{
int r, xact_count = 0;
ogs_assert(mme_ue);
xact_count = mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR);
mme_gtp_send_delete_all_sessions(mme_ue,
OGS_GTP_DELETE_SEND_RELEASE_WITH_UE_CONTEXT_REMOVE);
if (!MME_SESSION_RELEASE_PENDING(mme_ue) &&
mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR) ==
xact_count) {
enb_ue_t *enb_ue = enb_ue_find_by_id(mme_ue->enb_ue_id);
if (enb_ue) {
r = s1ap_send_ue_context_release_command(enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
} else {
ogs_warn("[%s] No S1 Context", mme_ue->imsi_bcd);
}
}
}
void mme_send_release_access_bearer_or_ue_context_release(enb_ue_t *enb_ue)
{
int r;
mme_ue_t *mme_ue = NULL;
ogs_assert(enb_ue);
mme_ue = mme_ue_find_by_id(enb_ue->mme_ue_id);
if (mme_ue) {
ogs_debug("[%s] Release access bearer request", mme_ue->imsi_bcd);
ogs_assert(OGS_OK ==
mme_gtp_send_release_access_bearers_request(
mme_ue, OGS_GTP_RELEASE_SEND_UE_CONTEXT_RELEASE_COMMAND));
} else {
ogs_debug("No UE Context");
r = s1ap_send_ue_context_release_command(enb_ue,
enb_ue->relcause.group, enb_ue->relcause.cause,
S1AP_UE_CTX_REL_S1_CONTEXT_REMOVE, 0);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
}
void mme_send_after_paging(mme_ue_t *mme_ue, bool failed)
{
int r;
mme_bearer_t *bearer = NULL;
ogs_assert(mme_ue);
switch (mme_ue->paging.type) {
case MME_PAGING_TYPE_DOWNLINK_DATA_NOTIFICATION:
bearer = mme_bearer_find_by_id(
OGS_POINTER_TO_UINT(mme_ue->paging.data));
if (!bearer) {
ogs_error("No Bearer [%d]", mme_ue->paging.type);
goto cleanup;
}
if (failed == true) {
ogs_assert(OGS_OK ==
mme_gtp_send_downlink_data_notification_ack(
bearer, OGS_GTP2_CAUSE_UNABLE_TO_PAGE_UE));
} else {
ogs_assert(OGS_OK ==
mme_gtp_send_downlink_data_notification_ack(
bearer, OGS_GTP2_CAUSE_REQUEST_ACCEPTED));
}
break;
case MME_PAGING_TYPE_CREATE_BEARER:
bearer = mme_bearer_find_by_id(
OGS_POINTER_TO_UINT(mme_ue->paging.data));
if (!bearer) {
ogs_error("No Bearer [%d]", mme_ue->paging.type);
goto cleanup;
}
if (failed == true) {
ogs_assert(OGS_OK ==
mme_gtp_send_create_bearer_response(
bearer, OGS_GTP2_CAUSE_UNABLE_TO_PAGE_UE));
} else {
r = nas_eps_send_activate_dedicated_bearer_context_request(bearer);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
break;
case MME_PAGING_TYPE_UPDATE_BEARER:
bearer = mme_bearer_find_by_id(
OGS_POINTER_TO_UINT(mme_ue->paging.data));
if (!bearer) {
ogs_error("No Bearer [%d]", mme_ue->paging.type);
goto cleanup;
}
if (failed == true) {
ogs_assert(OGS_OK ==
mme_gtp_send_update_bearer_response(
bearer, OGS_GTP2_CAUSE_UNABLE_TO_PAGE_UE));
} else {
ogs_gtp_xact_t *xact = NULL;
/* Get the first Entry */
ogs_list_for_each_entry(
&bearer->update.xact_list, xact, to_update_node) {
break;
}
if (!xact) {
ogs_error("No GTP xact");
goto cleanup;
}
/*
* MME must wait for Modify Bearer Context Accept
* before sending Update Bearer Response,
* To check this, start a peer timer to check it.
*/
ogs_timer_start(xact->tm_peer,
ogs_local_conf()->time.message.gtp.t3_response_duration);
r = nas_eps_send_modify_bearer_context_request(bearer,
(xact->update_flags &
OGS_GTP_MODIFY_QOS_UPDATE) ? 1 : 0,
(xact->update_flags &
OGS_GTP_MODIFY_TFT_UPDATE) ? 1 : 0);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
break;
case MME_PAGING_TYPE_DELETE_BEARER:
bearer = mme_bearer_find_by_id(
OGS_POINTER_TO_UINT(mme_ue->paging.data));
if (!bearer) {
ogs_error("No Bearer [%d]", mme_ue->paging.type);
goto cleanup;
}
if (failed == true) {
ogs_assert(OGS_OK ==
mme_gtp_send_delete_bearer_response(
bearer, OGS_GTP2_CAUSE_UNABLE_TO_PAGE_UE));
} else {
r = nas_eps_send_deactivate_bearer_context_request(bearer);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
break;
case MME_PAGING_TYPE_CS_CALL_SERVICE:
if (failed == true) {
ogs_assert(OGS_OK ==
sgsap_send_paging_reject(
mme_ue, SGSAP_SGS_CAUSE_UE_UNREACHABLE));
} else {
/* Nothing */
}
break;
case MME_PAGING_TYPE_SMS_SERVICE:
if (failed == true) {
ogs_assert(OGS_OK ==
sgsap_send_paging_reject(
mme_ue, SGSAP_SGS_CAUSE_UE_UNREACHABLE));
} else {
ogs_assert(OGS_OK ==
sgsap_send_service_request(
mme_ue, SGSAP_EMM_CONNECTED_MODE));
}
break;
case MME_PAGING_TYPE_DETACH_TO_UE:
if (failed == true) {
/* Nothing */
ogs_warn("MME-initiated Detach cannot be invoked");
} else {
r = nas_eps_send_detach_request(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
if (MME_P_TMSI_IS_AVAILABLE(mme_ue)) {
ogs_assert(OGS_OK == sgsap_send_detach_indication(mme_ue));
} else {
mme_send_delete_session_or_detach(mme_ue);
}
}
break;
default:
ogs_fatal("Invalid Paging Type[%d]", mme_ue->paging.type);
ogs_assert_if_reached();
}
cleanup:
CLEAR_SERVICE_INDICATOR(mme_ue);
MME_CLEAR_PAGING_INFO(mme_ue);
/* the above will clear the failure flag, restore it if we failed */
if (failed)
mme_ue->paging.failed = true;
}
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