forked from acouzens/open5gs
300 lines
10 KiB
C
300 lines
10 KiB
C
/*
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* Copyright (C) 2019 by Sukchan Lee <acetcom@gmail.com>
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*
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* This file is part of Open5GS.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "s1ap-path.h"
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#include "nas-path.h"
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#include "sgsap-path.h"
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#include "mme-gtp-path.h"
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#include "mme-path.h"
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#include "mme-fd-path.h"
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#include "mme-sm.h"
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void mme_send_delete_session_or_detach(mme_ue_t *mme_ue)
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{
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int r, xact_count;
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ogs_assert(mme_ue);
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xact_count = mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR);
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switch (mme_ue->detach_type) {
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case MME_DETACH_TYPE_REQUEST_FROM_UE:
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ogs_debug("Detach Request from UE");
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mme_gtp_send_delete_all_sessions(
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mme_ue, OGS_GTP_DELETE_SEND_DETACH_ACCEPT);
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if (!MME_SESSION_RELEASE_PENDING(mme_ue) &&
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mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR) ==
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xact_count) {
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r = nas_eps_send_detach_accept(mme_ue);
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ogs_expect(r == OGS_OK);
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ogs_assert(r != OGS_ERROR);
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}
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break;
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/* MME Explicit Detach, ie: O&M Procedures */
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case MME_DETACH_TYPE_MME_EXPLICIT:
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ogs_fatal("Not Implemented : MME_DETACH_TYPE_MME_EXPLICIT");
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ogs_assert_if_reached();
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break;
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/* HSS Explicit Detach, ie: Subscription Withdrawl Cancel Location
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*
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* TS23.401 - V16.10.0
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* Ch 5.3.8 Detach procedure
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* Ch 5.3.8.4 HSS-initiated Detach procedure
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*/
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case MME_DETACH_TYPE_HSS_EXPLICIT:
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ogs_debug("Explicit HSS Detach");
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mme_gtp_send_delete_all_sessions(mme_ue, OGS_GTP_DELETE_NO_ACTION);
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break;
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/* MME Implicit Detach, ie: Lost Communication
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* TS23.401 - V16.10.0
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* Ch 5.3.8.3 MME-initiated Detach procedure (Without Step 1)
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*/
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case MME_DETACH_TYPE_MME_IMPLICIT:
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ogs_debug("Implicit MME Detach");
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mme_gtp_send_delete_all_sessions(mme_ue,
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OGS_GTP_DELETE_SEND_RELEASE_WITH_UE_CONTEXT_REMOVE);
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if (!MME_SESSION_RELEASE_PENDING(mme_ue) &&
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mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR) ==
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xact_count) {
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enb_ue_t *enb_ue = enb_ue_cycle(mme_ue->enb_ue);
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if (enb_ue) {
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ogs_assert(OGS_OK ==
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s1ap_send_ue_context_release_command(enb_ue,
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S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
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S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0));
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} else {
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MME_UE_CHECK(OGS_LOG_WARN, mme_ue);
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mme_ue_remove(mme_ue);
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}
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}
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break;
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/* HSS Implicit Detach, ie: MME-UPDATE-PROCEDURE
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*
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* TS23.401 - V16.10.0
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* Ch 5.3.2 Attach procedure
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* Ch 5.3.2.1 E-UTRAN Initial Attach
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*
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* 9. The HSS sends Cancel Location (IMSI, Cancellation Type)
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* to the old MME. The old MME acknowledges with Cancel Location Ack (IMSI)
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* and removes the MM and bearer contexts. If the ULR-Flags indicates
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* "Initial-Attach-Indicator" and the HSS has the SGSN registration,
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* then the HSS sends Cancel Location (IMSI, Cancellation Type)
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* to the old SGSN. The Cancellation Type indicates the old MME/SGSN
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* to release the old Serving GW resource.
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*/
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case MME_DETACH_TYPE_HSS_IMPLICIT:
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ogs_debug("Implicit HSS Detach");
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mme_gtp_send_delete_all_sessions(mme_ue,
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OGS_GTP_DELETE_SEND_RELEASE_WITH_UE_CONTEXT_REMOVE);
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break;
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default:
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ogs_fatal(" Invalid OGS_NAS_EPS TYPE[%d]", mme_ue->detach_type);
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ogs_assert_if_reached();
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}
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}
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void mme_send_delete_session_or_mme_ue_context_release(mme_ue_t *mme_ue)
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{
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int r, xact_count = 0;
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ogs_assert(mme_ue);
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xact_count = mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR);
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mme_gtp_send_delete_all_sessions(mme_ue,
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OGS_GTP_DELETE_SEND_RELEASE_WITH_UE_CONTEXT_REMOVE);
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if (!MME_SESSION_RELEASE_PENDING(mme_ue) &&
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mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR) ==
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xact_count) {
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enb_ue_t *enb_ue = enb_ue_cycle(mme_ue->enb_ue);
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if (enb_ue) {
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r = s1ap_send_ue_context_release_command(enb_ue,
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S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
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S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0);
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ogs_expect(r == OGS_OK);
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ogs_assert(r != OGS_ERROR);
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} else {
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ogs_warn("[%s] No S1 Context", mme_ue->imsi_bcd);
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}
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}
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}
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void mme_send_release_access_bearer_or_ue_context_release(enb_ue_t *enb_ue)
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{
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int r;
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mme_ue_t *mme_ue = NULL;
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ogs_assert(enb_ue);
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mme_ue = enb_ue->mme_ue;
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if (mme_ue) {
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ogs_debug("[%s] Release access bearer request", mme_ue->imsi_bcd);
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ogs_assert(OGS_OK ==
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mme_gtp_send_release_access_bearers_request(
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mme_ue, OGS_GTP_RELEASE_SEND_UE_CONTEXT_RELEASE_COMMAND));
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} else {
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ogs_debug("No UE Context");
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r = s1ap_send_ue_context_release_command(enb_ue,
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S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
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S1AP_UE_CTX_REL_S1_CONTEXT_REMOVE, 0);
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ogs_expect(r == OGS_OK);
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ogs_assert(r != OGS_ERROR);
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}
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}
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void mme_send_after_paging(mme_ue_t *mme_ue, bool failed)
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{
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int r;
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mme_bearer_t *bearer = NULL;
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ogs_assert(mme_ue);
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switch (mme_ue->paging.type) {
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case MME_PAGING_TYPE_DOWNLINK_DATA_NOTIFICATION:
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bearer = mme_bearer_cycle(mme_ue->paging.data);
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if (!bearer) {
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ogs_error("No Bearer [%d]", mme_ue->paging.type);
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goto cleanup;
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}
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if (failed == true) {
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ogs_assert(OGS_OK ==
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mme_gtp_send_downlink_data_notification_ack(
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bearer, OGS_GTP2_CAUSE_UNABLE_TO_PAGE_UE));
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} else {
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ogs_assert(OGS_OK ==
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mme_gtp_send_downlink_data_notification_ack(
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bearer, OGS_GTP2_CAUSE_REQUEST_ACCEPTED));
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}
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break;
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case MME_PAGING_TYPE_CREATE_BEARER:
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bearer = mme_bearer_cycle(mme_ue->paging.data);
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if (!bearer) {
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ogs_error("No Bearer [%d]", mme_ue->paging.type);
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goto cleanup;
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}
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if (failed == true) {
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ogs_assert(OGS_OK ==
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mme_gtp_send_create_bearer_response(
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bearer, OGS_GTP2_CAUSE_UNABLE_TO_PAGE_UE));
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} else {
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r = nas_eps_send_activate_dedicated_bearer_context_request(bearer);
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ogs_expect(r == OGS_OK);
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ogs_assert(r != OGS_ERROR);
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}
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break;
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case MME_PAGING_TYPE_UPDATE_BEARER:
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bearer = mme_bearer_cycle(mme_ue->paging.data);
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if (!bearer) {
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ogs_error("No Bearer [%d]", mme_ue->paging.type);
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goto cleanup;
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}
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if (failed == true) {
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ogs_assert(OGS_OK ==
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mme_gtp_send_update_bearer_response(
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bearer, OGS_GTP2_CAUSE_UNABLE_TO_PAGE_UE));
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} else {
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ogs_gtp_xact_t *xact = ogs_gtp_xact_cycle(bearer->update.xact);
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if (!xact) {
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ogs_error("No GTP xact");
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goto cleanup;
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}
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r = nas_eps_send_modify_bearer_context_request(bearer,
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(xact->update_flags &
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OGS_GTP_MODIFY_QOS_UPDATE) ? 1 : 0,
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(xact->update_flags &
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OGS_GTP_MODIFY_TFT_UPDATE) ? 1 : 0);
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ogs_expect(r == OGS_OK);
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ogs_assert(r != OGS_ERROR);
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}
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break;
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case MME_PAGING_TYPE_DELETE_BEARER:
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bearer = mme_bearer_cycle(mme_ue->paging.data);
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if (!bearer) {
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ogs_error("No Bearer [%d]", mme_ue->paging.type);
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goto cleanup;
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}
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if (failed == true) {
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ogs_assert(OGS_OK ==
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mme_gtp_send_delete_bearer_response(
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bearer, OGS_GTP2_CAUSE_UNABLE_TO_PAGE_UE));
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} else {
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r = nas_eps_send_deactivate_bearer_context_request(bearer);
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ogs_expect(r == OGS_OK);
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ogs_assert(r != OGS_ERROR);
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}
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break;
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case MME_PAGING_TYPE_CS_CALL_SERVICE:
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if (failed == true) {
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ogs_assert(OGS_OK ==
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sgsap_send_paging_reject(
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mme_ue, SGSAP_SGS_CAUSE_UE_UNREACHABLE));
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} else {
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/* Nothing */
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}
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break;
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case MME_PAGING_TYPE_SMS_SERVICE:
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if (failed == true) {
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ogs_assert(OGS_OK ==
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sgsap_send_paging_reject(
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mme_ue, SGSAP_SGS_CAUSE_UE_UNREACHABLE));
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} else {
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ogs_assert(OGS_OK ==
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sgsap_send_service_request(
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mme_ue, SGSAP_EMM_CONNECTED_MODE));
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}
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break;
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case MME_PAGING_TYPE_DETACH_TO_UE:
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if (failed == true) {
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/* Nothing */
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ogs_warn("MME-initiated Detach cannot be invoked");
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} else {
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r = nas_eps_send_detach_request(mme_ue);
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ogs_expect(r == OGS_OK);
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ogs_assert(r != OGS_ERROR);
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if (MME_P_TMSI_IS_AVAILABLE(mme_ue)) {
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ogs_assert(OGS_OK == sgsap_send_detach_indication(mme_ue));
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} else {
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mme_send_delete_session_or_detach(mme_ue);
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}
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}
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break;
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default:
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ogs_fatal("Invalid Paging Type[%d]", mme_ue->paging.type);
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ogs_assert_if_reached();
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}
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cleanup:
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CLEAR_SERVICE_INDICATOR(mme_ue);
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MME_CLEAR_PAGING_INFO(mme_ue);
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/* the above will clear the failure flag, restore it if we failed */
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if (failed)
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mme_ue->paging.failed = true;
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}
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