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open5gs/src/mme/emm-sm.c

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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 "mme-event.h"
#include "mme-timer.h"
#include "s1ap-handler.h"
#include "mme-gn-handler.h"
#include "mme-fd-path.h"
#include "emm-handler.h"
#include "emm-build.h"
#include "esm-handler.h"
#include "nas-path.h"
#include "nas-security.h"
#include "s1ap-path.h"
#include "sgsap-types.h"
#include "sgsap-path.h"
#include "mme-gtp-path.h"
#include "mme-path.h"
#include "mme-sm.h"
#undef OGS_LOG_DOMAIN
#define OGS_LOG_DOMAIN __emm_log_domain
typedef enum {
EMM_COMMON_STATE_DEREGISTERED,
EMM_COMMON_STATE_REGISTERED,
} emm_common_state_e;
static void common_register_state(ogs_fsm_t *s, mme_event_t *e,
emm_common_state_e state);
void emm_state_initial(ogs_fsm_t *s, mme_event_t *e)
{
ogs_assert(s);
mme_sm_debug(e);
OGS_FSM_TRAN(s, &emm_state_de_registered);
}
void emm_state_final(ogs_fsm_t *s, mme_event_t *e)
{
ogs_assert(s);
mme_sm_debug(e);
}
void emm_state_de_registered(ogs_fsm_t *s, mme_event_t *e)
{
int r;
mme_ue_t *mme_ue = NULL;
ogs_assert(e);
mme_sm_debug(e);
mme_ue = e->mme_ue;
ogs_assert(mme_ue);
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
CLEAR_SERVICE_INDICATOR(mme_ue);
CLEAR_MME_UE_ALL_TIMERS(mme_ue);
break;
case OGS_FSM_EXIT_SIG:
break;
case MME_EVENT_EMM_MESSAGE:
common_register_state(s, e, EMM_COMMON_STATE_DEREGISTERED);
break;
case MME_EVENT_EMM_TIMER:
switch (e->timer_id) {
case MME_TIMER_T3470:
if (mme_ue->t3470.retry_count >=
mme_timer_cfg(MME_TIMER_T3470)->max_count) {
ogs_warn("Retransmission of Identity-Request failed. "
"Stop retransmission");
OGS_FSM_TRAN(&mme_ue->sm, &emm_state_exception);
} else {
mme_ue->t3470.retry_count++;
r = nas_eps_send_identity_request(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
break;
default:
ogs_error("Unknown timer[%s:%d]",
mme_timer_get_name(e->timer_id), e->timer_id);
}
break;
default:
ogs_error("Unknown event[%s]", mme_event_get_name(e));
}
}
void emm_state_registered(ogs_fsm_t *s, mme_event_t *e)
{
int r;
mme_ue_t *mme_ue = NULL;
ogs_assert(e);
mme_sm_debug(e);
mme_ue = e->mme_ue;
ogs_assert(mme_ue);
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
break;
case OGS_FSM_EXIT_SIG:
break;
case MME_EVENT_EMM_MESSAGE:
common_register_state(s, e, EMM_COMMON_STATE_REGISTERED);
break;
case MME_EVENT_EMM_TIMER:
switch (e->timer_id) {
case MME_TIMER_T3413:
if (mme_ue->t3413.retry_count >=
mme_timer_cfg(MME_TIMER_T3413)->max_count) {
/* Paging failed */
ogs_warn("Paging to IMSI[%s] failed. Stop paging",
mme_ue->imsi_bcd);
CLEAR_MME_UE_TIMER(mme_ue->t3413);
mme_ue->paging.failed = true;
if (MME_PAGING_ONGOING(mme_ue))
mme_send_after_paging(mme_ue, true);
} else {
mme_ue->t3413.retry_count++;
/*
* If t3413 is timeout, the saved pkbuf is used.
* We don't have to set CNDomain.
* So, we just set CNDomain to 0
*/
r = s1ap_send_paging(mme_ue, 0);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
break;
case MME_TIMER_T3470:
if (mme_ue->t3470.retry_count >=
mme_timer_cfg(MME_TIMER_T3470)->max_count) {
ogs_warn("Retransmission of Identity-Request failed. "
"Stop retransmission");
OGS_FSM_TRAN(&mme_ue->sm, &emm_state_exception);
} else {
mme_ue->t3470.retry_count++;
r = nas_eps_send_identity_request(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
break;
case MME_TIMER_T3422:
if (mme_ue->t3422.retry_count >=
mme_timer_cfg(MME_TIMER_T3422)->max_count) {
ogs_warn("Retransmission of Detach Request failed. "
"Stop retransmission");
OGS_FSM_TRAN(&mme_ue->sm, &emm_state_exception);
} else {
mme_ue->t3422.retry_count++;
r = nas_eps_send_detach_request(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
break;
case MME_TIMER_MOBILE_REACHABLE:
ogs_info("[%s] Mobile Reachable timer expired", mme_ue->imsi_bcd);
CLEAR_MME_UE_TIMER(mme_ue->t_mobile_reachable);
/*
* TS 24.301
* Section 5.3.5
* Handling of the periodic tracking area update timer and
* mobile reachable timer (S1 mode only)
*
* The periodic tracking area updating procedure is used to
* periodically notify the availability of the UE to the network.
* The procedure is controlled in the UE by timer T3412.
* The value of timer T3412 is sent by the network to the UE
* in the ATTACH ACCEPT message and can be sent in the TRACKING AREA
* UPDATE ACCEPT message. The UE shall apply this value in all tracking
* areas of the list of tracking areas assigned to the UE
* until a new value is received.
*
* If timer T3412 received by the UE in an ATTACH ACCEPT or TRACKING
* AREA UPDATE ACCEPT message contains an indication that the timer is
* deactivated or the timer value is zero, then timer T3412 is
* deactivated and the UE shall not perform the periodic tracking area
* updating procedure.
*
* Timer T3412 is reset and started with its initial value,
* when the UE changes from EMM-CONNECTED to EMM-IDLE mode.
*
* Timer T3412 is stopped when the UE enters EMM-CONNECTED mode or
* the EMM-DEREGISTERED state. If the UE is attached for emergency
* bearer services, and timer T3412 expires, the UE shall not initiate
* a periodic tracking area updating procedure, but shall locally detach
* from the network. When the UE is camping on a suitable cell, it may
* re-attach to regain normal service.
*
* When a UE is not attached for emergency bearer services, and timer
* T3412 expires, the periodic tracking area updating procedure shall
* be started and the timer shall be set to its initial value
* for the next start.
*
* If the UE is not attached for emergency bearer services, the mobile
* reachable timer shall be longer than T3412. In this case, by default,
* the mobile reachable timer is 4 minutes greater than timer T3412.
*
* Upon expiry of the mobile reachable timer the network shall start
* the implicit detach timer. The value of the implicit detach timer is
* network dependent. If ISR is activated, the default value of
* the implicit detach timer is 4 minutes greater than timer T3423.
* If the implicit detach timer expires before the UE contacts
* the network, the network shall implicitly detach the UE. If the MME
* includes timer T3346 in the TRACKING AREA UPDATE REJECT message or
* the SERVICE REJECT message and timer T3346 is greater than timer
* T3412, the MME sets the mobile reachable timer and the implicit
* detach timer such that the sum of the timer values is greater than
* timer T3346.
*/
ogs_debug("[%s] Starting Implicit Detach timer",
mme_ue->imsi_bcd);
ogs_timer_start(mme_ue->t_implicit_detach.timer,
ogs_time_from_sec(mme_self()->time.t3412.value + 240));
break;
case MME_TIMER_IMPLICIT_DETACH:
ogs_info("[%s] Implicit Detach timer expired, detaching UE",
mme_ue->imsi_bcd);
CLEAR_MME_UE_TIMER(mme_ue->t_implicit_detach);
/* TS 24.301 5.3.5
* If the implicit detach timer expires before the UE contacts
* the network, the network shall implicitly detach the UE.
*/
mme_ue->detach_type = MME_DETACH_TYPE_MME_IMPLICIT;
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);
}
OGS_FSM_TRAN(s, &emm_state_de_registered);
break;
default:
ogs_error("Unknown timer[%s:%d]",
mme_timer_get_name(e->timer_id), e->timer_id);
}
break;
default:
ogs_error("Unknown event[%s]", mme_event_get_name(e));
}
}
static void common_register_state(ogs_fsm_t *s, mme_event_t *e,
emm_common_state_e state)
{
int r, rv, xact_count = 0;
mme_ue_t *mme_ue = NULL;
enb_ue_t *enb_ue = NULL;
mme_sgsn_t *sgsn = NULL;
ogs_nas_eps_message_t *message = NULL;
ogs_nas_rai_t rai;
ogs_nas_security_header_type_t h;
ogs_assert(e);
mme_sm_debug(e);
mme_ue = e->mme_ue;
ogs_assert(mme_ue);
switch (e->id) {
case MME_EVENT_EMM_MESSAGE:
message = e->nas_message;
ogs_assert(message);
enb_ue = enb_ue_cycle(mme_ue->enb_ue);
ogs_assert(enb_ue);
h.type = e->nas_type;
xact_count = mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR);
if (message->emm.h.security_header_type
== OGS_NAS_SECURITY_HEADER_FOR_SERVICE_REQUEST_MESSAGE) {
ogs_info("[%s] Service request", mme_ue->imsi_bcd);
if (state != EMM_COMMON_STATE_REGISTERED) {
ogs_info("Service request : Not registered[%s]",
mme_ue->imsi_bcd);
r = nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
rv = emm_handle_service_request(
mme_ue, &message->emm.service_request);
if (rv != OGS_OK) {
ogs_error("emm_handle_service_request() failed");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
if (!MME_UE_HAVE_IMSI(mme_ue)) {
ogs_info("Service request : Unknown UE");
r = nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
if (!SECURITY_CONTEXT_IS_VALID(mme_ue)) {
ogs_error("No Security Context : IMSI[%s]", mme_ue->imsi_bcd);
r = nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
if (!SESSION_CONTEXT_IS_AVAILABLE(mme_ue)) {
ogs_error("No Session Context : IMSI[%s]", mme_ue->imsi_bcd);
r = nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
if (!ACTIVE_EPS_BEARERS_IS_AVAIABLE(mme_ue)) {
ogs_error("No active EPS bearers : IMSI[%s]", mme_ue->imsi_bcd);
r = nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_NO_EPS_BEARER_CONTEXT_ACTIVATED);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
/*
* If the OLD ENB_UE is being maintained in MME-UE Context,
* it deletes the S1 Context after exchanging
* the UEContextReleaseCommand/Complete with the eNB
*/
CLEAR_S1_CONTEXT(mme_ue);
r = s1ap_send_initial_context_setup_request(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_registered);
break;
}
switch (message->emm.h.message_type) {
case OGS_NAS_EPS_IDENTITY_RESPONSE:
ogs_info("Identity response");
CLEAR_MME_UE_TIMER(mme_ue->t3470);
rv = emm_handle_identity_response(mme_ue,
&message->emm.identity_response);
if (rv != OGS_OK) {
ogs_error("emm_handle_identity_response() failed");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
if (!MME_UE_HAVE_IMSI(mme_ue)) {
ogs_error("No IMSI");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
mme_gtp_send_delete_all_sessions(mme_ue,
OGS_GTP_DELETE_SEND_AUTHENTICATION_REQUEST);
if (!MME_SESSION_RELEASE_PENDING(mme_ue) &&
mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR) ==
xact_count) {
mme_s6a_send_air(enb_ue, mme_ue, NULL);
}
OGS_FSM_TRAN(s, &emm_state_authentication);
break;
case OGS_NAS_EPS_ATTACH_REQUEST:
ogs_info("[%s] Attach request", mme_ue->imsi_bcd);
rv = emm_handle_attach_request(
mme_ue, &message->emm.attach_request, e->pkbuf);
if (rv != OGS_OK) {
ogs_error("emm_handle_attach_request() failed");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
if (!MME_UE_HAVE_IMSI(mme_ue)) {
CLEAR_MME_UE_TIMER(mme_ue->t3470);
r = nas_eps_send_identity_request(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
break;
}
if (h.integrity_protected && SECURITY_CONTEXT_IS_VALID(mme_ue)) {
/*
* If the OLD ENB_UE is being maintained in MME-UE Context,
* it deletes the S1 Context after exchanging
* the UEContextReleaseCommand/Complete with the eNB
*/
CLEAR_S1_CONTEXT(mme_ue);
mme_gtp_send_delete_all_sessions(mme_ue,
OGS_GTP_DELETE_HANDLE_PDN_CONNECTIVITY_REQUEST);
if (!MME_SESSION_RELEASE_PENDING(mme_ue) &&
mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR) ==
xact_count) {
rv = nas_eps_send_emm_to_esm(mme_ue,
&mme_ue->pdn_connectivity_request);
if (rv != OGS_OK) {
ogs_error("nas_eps_send_emm_to_esm() failed");
r = nas_eps_send_attach_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_PROTOCOL_ERROR_UNSPECIFIED,
OGS_NAS_ESM_CAUSE_PROTOCOL_ERROR_UNSPECIFIED);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
}
OGS_FSM_TRAN(s, &emm_state_initial_context_setup);
} else {
mme_gtp_send_delete_all_sessions(mme_ue,
OGS_GTP_DELETE_SEND_AUTHENTICATION_REQUEST);
if (!MME_SESSION_RELEASE_PENDING(mme_ue) &&
mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR) ==
xact_count) {
mme_s6a_send_air(enb_ue, mme_ue, NULL);
}
OGS_FSM_TRAN(s, &emm_state_authentication);
}
break;
case OGS_NAS_EPS_TRACKING_AREA_UPDATE_REQUEST:
ogs_info("[%s] Tracking area update request", mme_ue->imsi_bcd);
rv = emm_handle_tau_request(mme_ue,
&message->emm.tracking_area_update_request, e->pkbuf);
if (rv != OGS_OK) {
ogs_error("emm_handle_tau_request() failed");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
if (emm_tau_request_ue_comes_from_gb_or_iu(&message->emm.tracking_area_update_request)) {
ogs_info("TAU request : UE comes from SGSN, attempt retrieving context");
guti_to_rai_ptmsi(&mme_ue->next.guti, &rai, NULL, NULL);
sgsn = mme_sgsn_find_by_routing_address(&rai, 0xffff);
if (!sgsn) {
ogs_plmn_id_t plmn_id;
ogs_nas_to_plmn_id(&plmn_id, &rai.lai.nas_plmn_id);
ogs_warn("No SGSN route matching RAI[MCC:%u MNC:%u LAC:%u RAC:%u]",
ogs_plmn_id_mcc(&plmn_id), ogs_plmn_id_mnc(&plmn_id),
rai.lai.lac, rai.rac);
r = nas_eps_send_tau_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
mme_gtp1_send_sgsn_context_request(sgsn, mme_ue);
/* FIXME: use a specific FSM state here to state we are waiting for resolution from Gn? */
break;
}
if (!MME_UE_HAVE_IMSI(mme_ue)) {
ogs_info("TAU request : Unknown UE");
r = nas_eps_send_tau_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
if (!SESSION_CONTEXT_IS_AVAILABLE(mme_ue)) {
ogs_warn("No PDN Connection : UE[%s]", mme_ue->imsi_bcd);
r = nas_eps_send_tau_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
if (!ACTIVE_EPS_BEARERS_IS_AVAIABLE(mme_ue)) {
ogs_warn("No active EPS bearers : IMSI[%s]", mme_ue->imsi_bcd);
r = nas_eps_send_tau_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_NO_EPS_BEARER_CONTEXT_ACTIVATED);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
if (!h.integrity_protected || !SECURITY_CONTEXT_IS_VALID(mme_ue)) {
mme_s6a_send_air(enb_ue, mme_ue, NULL);
OGS_FSM_TRAN(&mme_ue->sm, &emm_state_authentication);
break;
}
/*
* If the OLD ENB_UE is being maintained in MME-UE Context,
* it deletes the S1 Context after exchanging
* the UEContextReleaseCommand/Complete with the eNB
*/
CLEAR_S1_CONTEXT(mme_ue);
/*
* <EMM-IDLE State>
* 1. InitialUEMessage + Tracking area update request
* Active flag : No bearer establishment requested (0)
* EPS update type : TA updating (0) or Periodic updating (3)
* 2. DownlinkNASTransport + Tracking area update accept
* EPS update result value : TA updated (0)
* 3. UEContextReleaseCommand
* Cause : nas(2) + normal-release(0)
* 4. UEContextReleaseComplete
*
* <EMM-IDLE State>
* 1. InitialUEMessage + Tracking area update request
* Active flag : bearer establishment requested (1)
* EPS update type : Combined TA/LA updating with IMSI attach (2)
* 2. InitialContextSetupRequest + Tracking area update accept
* EPS update result : Combined TA/LA updated (1)
* New GUTI
* 3. InitialContextSetupResponse
* 4. UplinkNASTransport + Tracking area update complete
*
* <De-registered State>
* 1. S1SetupRequest/S1SetupResponse
* 2. InitialUEMessage + Tracking area update request
* Active flag : bearer establishment requested (1)
* EPS update type : Periodic updating (3)
* 3. InitialContextSetupRequest + Tracking area update accept
* EPS update result : TA updated (0)
* No GUTI
* 4. InitialContextSetupResponse
*
* <Handover>
* 1. HandoverNotify (Target)
* 2. UplinkNASTransport + Tracking area update request (Target)
* Active flag : bearer establishment requested (1)
* EPS update type : TA updating (0)
* 3. UEContextReleaseCommand (Source)
* Cause : radioNetwork(0) + successful-handover(2)
* 4. UEcontextReleaseComplete (Source)
* 5. DownlinkNASTransport + Tracking area update accept (Target)
* EPS update result : TA updated (0)
*
* <Handover + EMM-Idle State>
* 1. HandoverNotify (Target)
*
* 2. UEContextReleaseCommand (Source)
* Cause : radioNetwork(0) + successful-handover(2)
* 3. UEcontextReleaseComplete (Source)
* 4. UEContextReleaseRequest (Target)
* Cause : transport(1) + transport-resource-unavailable(0)
* 5. UEContextReleaseCommand (Target)
* Cause : nas(2) + normal-release(0)
* 6. UEcontextReleaseComplete (Target)
*
* 7. InitialUEMessage + Tracking area update request (Target)
* Active flag : bearer establishment requested (1)
* EPS update type : TA updating (0)
* 8. InitialContextSetupRequest + Tracking area update accept
* EPS update result : TA updated (0)
* New GUTI
* 9. InitialContextSetupResponse (Target)
* EPS update result : TA updated (0)
* 10. UplinkNASTransport + Tracking area update complete (Target)
*/
if (e->s1ap_code == S1AP_ProcedureCode_id_initialUEMessage) {
ogs_debug(" Iniital UE Message");
if (mme_ue->nas_eps.update.active_flag) {
/*
* TS33.401
* 7 Security procedures between UE and EPS access network elements
* 7.2 Handling of user-related keys in E-UTRAN
* 7.2.7 Key handling for the TAU procedure when registered in E-UTRAN
*
* If the "active flag" is set in the TAU request message or
* the MME chooses to establish radio bearers when there is pending downlink
* UP data or pending downlink signalling, radio bearers will be established
* as part of the TAU procedure and a KeNB derivation is necessary.
*/
ogs_kdf_kenb(mme_ue->kasme, mme_ue->ul_count.i32,
mme_ue->kenb);
ogs_kdf_nh_enb(mme_ue->kasme, mme_ue->kenb, mme_ue->nh);
mme_ue->nhcc = 1;
r = nas_eps_send_tau_accept(mme_ue,
S1AP_ProcedureCode_id_InitialContextSetup);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
} else {
r = nas_eps_send_tau_accept(mme_ue,
S1AP_ProcedureCode_id_downlinkNASTransport);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
} else if (e->s1ap_code ==
S1AP_ProcedureCode_id_uplinkNASTransport) {
ogs_debug(" Uplink NAS Transport");
r = nas_eps_send_tau_accept(mme_ue,
S1AP_ProcedureCode_id_downlinkNASTransport);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
} else {
ogs_fatal("Invalid Procedure Code[%d]", (int)e->s1ap_code);
}
if (!mme_ue->nas_eps.update.active_flag)
mme_send_release_access_bearer_or_ue_context_release(enb_ue);
if (mme_ue->next.m_tmsi) {
ogs_fatal("MME does not create new GUTI");
ogs_assert_if_reached();
OGS_FSM_TRAN(s, &emm_state_initial_context_setup);
} else {
OGS_FSM_TRAN(s, &emm_state_registered);
}
break;
case OGS_NAS_EPS_EXTENDED_SERVICE_REQUEST:
ogs_info("[%s] Extended service request", mme_ue->imsi_bcd);
rv = emm_handle_extended_service_request(
mme_ue, &message->emm.extended_service_request);
if (rv != OGS_OK) {
ogs_error("emm_handle_extended_service_request() failed");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
if (!MME_UE_HAVE_IMSI(mme_ue)) {
ogs_warn("Extended Service request : Unknown UE");
r = nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
if (!SESSION_CONTEXT_IS_AVAILABLE(mme_ue)) {
ogs_warn("No PDN Connection : UE[%s]", mme_ue->imsi_bcd);
r = nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
if (!SECURITY_CONTEXT_IS_VALID(mme_ue)) {
ogs_error("No Security Context : IMSI[%s]", mme_ue->imsi_bcd);
r = nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
/*
* If the OLD ENB_UE is being maintained in MME-UE Context,
* it deletes the S1 Context after exchanging
* the UEContextReleaseCommand/Complete with the eNB
*/
CLEAR_S1_CONTEXT(mme_ue);
if (e->s1ap_code == S1AP_ProcedureCode_id_initialUEMessage) {
ogs_debug(" Initial UE Message");
if (!MME_P_TMSI_IS_AVAILABLE(mme_ue)) {
ogs_warn("No P-TMSI : UE[%s]", mme_ue->imsi_bcd);
r = nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
mme_send_release_access_bearer_or_ue_context_release(
enb_ue);
break;
}
if (mme_ue->nas_eps.service.value ==
OGS_NAS_SERVICE_TYPE_CS_FALLBACK_FROM_UE ||
mme_ue->nas_eps.service.value ==
OGS_NAS_SERVICE_TYPE_CS_FALLBACK_EMERGENCY_CALL_FROM_UE) {
ogs_debug(" MO-CSFB-INDICATION[%d]",
mme_ue->nas_eps.service.value);
ogs_assert(OGS_OK ==
sgsap_send_mo_csfb_indication(mme_ue));
} else if (mme_ue->nas_eps.service.value ==
OGS_NAS_SERVICE_TYPE_CS_FALLBACK_TO_UE) {
ogs_debug(" SERVICE_REQUEST[%d]",
mme_ue->nas_eps.service.value);
ogs_assert(OGS_OK ==
sgsap_send_service_request(mme_ue, SGSAP_EMM_IDLE_MODE)
);
} else {
ogs_warn(" Unknown CSFB Service Type[%d]",
mme_ue->nas_eps.service.value);
r = nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
r = s1ap_send_initial_context_setup_request(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
} else if (e->s1ap_code ==
S1AP_ProcedureCode_id_uplinkNASTransport) {
ogs_debug(" Uplink NAS Transport");
if (!MME_P_TMSI_IS_AVAILABLE(mme_ue)) {
ogs_warn("No P-TMSI : UE[%s]", mme_ue->imsi_bcd);
r = nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
break;
}
if (mme_ue->nas_eps.service.value ==
OGS_NAS_SERVICE_TYPE_CS_FALLBACK_FROM_UE ||
mme_ue->nas_eps.service.value ==
OGS_NAS_SERVICE_TYPE_CS_FALLBACK_EMERGENCY_CALL_FROM_UE) {
ogs_debug(" MO-CSFB-INDICATION[%d]",
mme_ue->nas_eps.service.value);
ogs_assert(OGS_OK ==
sgsap_send_mo_csfb_indication(mme_ue));
} else if (mme_ue->nas_eps.service.value ==
OGS_NAS_SERVICE_TYPE_CS_FALLBACK_TO_UE) {
ogs_debug(" SERVICE_REQUEST[%d]",
mme_ue->nas_eps.service.value);
ogs_assert(OGS_OK ==
sgsap_send_service_request(
mme_ue, SGSAP_EMM_CONNECTED_MODE));
} else {
ogs_warn(" Unknown CSFB Service Type[%d]",
mme_ue->nas_eps.service.value);
r = nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
r = s1ap_send_ue_context_modification_request(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
} else {
ogs_error("Invalid Procedure Code[%d]", (int)e->s1ap_code);
}
break;
case OGS_NAS_EPS_EMM_STATUS:
ogs_warn("EMM STATUS : IMSI[%s] Cause[%d]",
mme_ue->imsi_bcd, message->emm.emm_status.emm_cause);
break;
case OGS_NAS_EPS_DETACH_REQUEST:
ogs_info("[%s] Detach request", mme_ue->imsi_bcd);
rv = emm_handle_detach_request(
mme_ue, &message->emm.detach_request_from_ue);
if (rv != OGS_OK) {
ogs_error("emm_handle_detach_request() failed");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
if (!MME_UE_HAVE_IMSI(mme_ue)) {
ogs_warn("Detach request : Unknown UE");
ogs_assert(OGS_OK ==
nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK));
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
if (!SECURITY_CONTEXT_IS_VALID(mme_ue)) {
ogs_error("No Security Context : IMSI[%s]", mme_ue->imsi_bcd);
ogs_assert(OGS_OK ==
nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK));
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
/*
* If the OLD ENB_UE is being maintained in MME-UE Context,
* it deletes the S1 Context after exchanging
* the UEContextReleaseCommand/Complete with the eNB
*/
CLEAR_S1_CONTEXT(mme_ue);
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);
}
OGS_FSM_TRAN(s, &emm_state_de_registered);
break;
case OGS_NAS_EPS_DETACH_ACCEPT:
ogs_info("[%s] Detach accept", mme_ue->imsi_bcd);
CLEAR_MME_UE_TIMER(mme_ue->t3422);
r = s1ap_send_ue_context_release_command(enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_detach,
S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_de_registered);
break;
case OGS_NAS_EPS_UPLINK_NAS_TRANSPORT:
ogs_debug("Uplink NAS Transport");
ogs_debug(" IMSI[%s]", mme_ue->imsi_bcd);
if (MME_SGSAP_IS_CONNECTED(mme_ue)) {
ogs_assert(OGS_OK ==
sgsap_send_uplink_unitdata(mme_ue, &message->emm.
uplink_nas_transport.nas_message_container));
} else {
S1AP_MME_UE_S1AP_ID_t MME_UE_S1AP_ID;
S1AP_ENB_UE_S1AP_ID_t ENB_UE_S1AP_ID;
ogs_warn("No connection of MSC/VLR");
MME_UE_S1AP_ID = enb_ue->mme_ue_s1ap_id;
ENB_UE_S1AP_ID = enb_ue->enb_ue_s1ap_id;
r = s1ap_send_error_indication(enb_ue->enb,
&MME_UE_S1AP_ID, &ENB_UE_S1AP_ID,
S1AP_Cause_PR_transport,
S1AP_CauseTransport_transport_resource_unavailable);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
break;
case OGS_NAS_EPS_ATTACH_COMPLETE:
ogs_error("[%s] Attach complete in INVALID-STATE",
mme_ue->imsi_bcd);
break;
case OGS_NAS_EPS_TRACKING_AREA_UPDATE_COMPLETE:
ogs_error("[%s] Tracking area update complete in INVALID-STATE",
mme_ue->imsi_bcd);
break;
default:
ogs_warn("Unknown message[%d]", message->emm.h.message_type);
}
break;
default:
ogs_fatal("Unknown event[%s]", mme_event_get_name(e));
ogs_assert_if_reached();
}
}
void emm_state_authentication(ogs_fsm_t *s, mme_event_t *e)
{
int r, rv;
mme_ue_t *mme_ue = NULL;
enb_ue_t *enb_ue = NULL;
ogs_nas_eps_message_t *message = NULL;
ogs_assert(s);
ogs_assert(e);
mme_sm_debug(e);
mme_ue = e->mme_ue;
ogs_assert(mme_ue);
MME_UE_CHECK(OGS_LOG_DEBUG, mme_ue);
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
break;
case OGS_FSM_EXIT_SIG:
break;
case MME_EVENT_EMM_MESSAGE:
message = e->nas_message;
ogs_assert(message);
enb_ue = enb_ue_cycle(mme_ue->enb_ue);
ogs_assert(enb_ue);
switch (message->emm.h.message_type) {
case OGS_NAS_EPS_AUTHENTICATION_RESPONSE:
{
ogs_nas_eps_authentication_response_t *authentication_response =
&message->emm.authentication_response;
ogs_nas_authentication_response_parameter_t
*authentication_response_parameter =
&authentication_response->
authentication_response_parameter;
ogs_debug("Authentication response");
ogs_debug(" IMSI[%s]", mme_ue->imsi_bcd);
CLEAR_MME_UE_TIMER(mme_ue->t3460);
if (authentication_response_parameter->length == 0 ||
memcmp(authentication_response_parameter->res,
mme_ue->xres,
authentication_response_parameter->length) != 0) {
ogs_log_hexdump(OGS_LOG_WARN,
authentication_response_parameter->res,
authentication_response_parameter->length);
ogs_log_hexdump(OGS_LOG_WARN,
mme_ue->xres, OGS_MAX_RES_LEN);
r = nas_eps_send_authentication_reject(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(&mme_ue->sm, &emm_state_exception);
} else {
OGS_FSM_TRAN(&mme_ue->sm, &emm_state_security_mode);
}
break;
}
case OGS_NAS_EPS_AUTHENTICATION_FAILURE:
{
ogs_nas_eps_authentication_failure_t *authentication_failure =
&message->emm.authentication_failure;
ogs_nas_authentication_failure_parameter_t
*authentication_failure_parameter =
&authentication_failure->
authentication_failure_parameter;
ogs_debug("Authentication failure");
ogs_debug(" IMSI[%s] OGS_NAS_EMM_CAUSE[%d]", mme_ue->imsi_bcd,
authentication_failure->emm_cause);
CLEAR_MME_UE_TIMER(mme_ue->t3460);
switch (authentication_failure->emm_cause) {
case OGS_NAS_EMM_CAUSE_MAC_FAILURE:
ogs_warn("Authentication failure(MAC failure)");
break;
case OGS_NAS_EMM_CAUSE_NON_EPS_AUTHENTICATION_UNACCEPTABLE:
ogs_error("Authentication failure"
"(Non-EPS authentication unacceptable)");
break;
case OGS_NAS_EMM_CAUSE_SYNCH_FAILURE:
ogs_info("Authentication failure(Synch failure)");
mme_s6a_send_air(enb_ue, mme_ue,
authentication_failure_parameter);
return;
default:
ogs_error("Unknown OGS_NAS_EMM_CAUSE{%d] in Authentication"
" failure",
authentication_failure->emm_cause);
break;
}
r = nas_eps_send_authentication_reject(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(&mme_ue->sm, &emm_state_exception);
break;
}
case OGS_NAS_EPS_ATTACH_REQUEST:
ogs_warn("[%s] Attach request", mme_ue->imsi_bcd);
rv = emm_handle_attach_request(
mme_ue, &message->emm.attach_request, e->pkbuf);
if (rv != OGS_OK) {
ogs_error("emm_handle_attach_request() failed");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
mme_s6a_send_air(enb_ue, mme_ue, NULL);
OGS_FSM_TRAN(s, &emm_state_authentication);
break;
case OGS_NAS_EPS_EMM_STATUS:
ogs_warn("EMM STATUS : IMSI[%s] Cause[%d]",
mme_ue->imsi_bcd, message->emm.emm_status.emm_cause);
break;
case OGS_NAS_EPS_DETACH_REQUEST:
ogs_warn("[%s] Detach request", mme_ue->imsi_bcd);
rv = emm_handle_detach_request(
mme_ue, &message->emm.detach_request_from_ue);
if (rv != OGS_OK) {
ogs_error("emm_handle_detach_request() failed");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
if (!MME_UE_HAVE_IMSI(mme_ue)) {
ogs_warn("Detach request : Unknown UE");
ogs_assert(OGS_OK ==
nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK));
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
if (!SECURITY_CONTEXT_IS_VALID(mme_ue)) {
ogs_error("No Security Context : IMSI[%s]", mme_ue->imsi_bcd);
ogs_assert(OGS_OK ==
nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK));
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
/*
* If the OLD ENB_UE is being maintained in MME-UE Context,
* it deletes the S1 Context after exchanging
* the UEContextReleaseCommand/Complete with the eNB
*/
CLEAR_S1_CONTEXT(mme_ue);
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);
}
OGS_FSM_TRAN(s, &emm_state_de_registered);
break;
default:
ogs_warn("Unknown message[%d]", message->emm.h.message_type);
break;
}
break;
case MME_EVENT_EMM_TIMER:
switch (e->timer_id) {
case MME_TIMER_T3460:
if (mme_ue->t3460.retry_count >=
mme_timer_cfg(MME_TIMER_T3460)->max_count) {
ogs_warn("Retransmission of IMSI[%s] failed. "
"Stop retransmission", mme_ue->imsi_bcd);
OGS_FSM_TRAN(&mme_ue->sm, &emm_state_exception);
r = nas_eps_send_authentication_reject(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
} else {
mme_ue->t3460.retry_count++;
r = nas_eps_send_authentication_request(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
break;
default:
ogs_error("Unknown timer[%s:%d]",
mme_timer_get_name(e->timer_id), e->timer_id);
break;
}
break;
default:
ogs_error("Unknown event[%s]", mme_event_get_name(e));
break;
}
}
void emm_state_security_mode(ogs_fsm_t *s, mme_event_t *e)
{
int r, rv;
mme_ue_t *mme_ue = NULL;
enb_ue_t *enb_ue = NULL;
ogs_nas_eps_message_t *message = NULL;
ogs_nas_security_header_type_t h;
ogs_assert(s);
ogs_assert(e);
mme_sm_debug(e);
mme_ue = e->mme_ue;
ogs_assert(mme_ue);
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
CLEAR_MME_UE_TIMER(mme_ue->t3460);
r = nas_eps_send_security_mode_command(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
break;
case OGS_FSM_EXIT_SIG:
break;
case MME_EVENT_EMM_MESSAGE:
message = e->nas_message;
ogs_assert(message);
enb_ue = enb_ue_cycle(mme_ue->enb_ue);
ogs_assert(enb_ue);
if (message->emm.h.security_header_type
== OGS_NAS_SECURITY_HEADER_FOR_SERVICE_REQUEST_MESSAGE) {
ogs_debug("Service request");
r = nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_SECURITY_MODE_REJECTED_UNSPECIFIED);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
switch (message->emm.h.message_type) {
case OGS_NAS_EPS_SECURITY_MODE_COMPLETE:
ogs_debug("Security mode complete");
ogs_debug(" IMSI[%s]", mme_ue->imsi_bcd);
CLEAR_MME_UE_TIMER(mme_ue->t3460);
/*
* TS24.301
* Section 4.4.4.3
* Integrity checking of NAS signalling messages in the MME:
*
* Once the secure exchange of NAS messages has been established
* for the NAS signalling connection, the receiving EMM or ESM entity
* in the MME shall not process any NAS signalling messages
* unless they have been successfully integrity checked by the NAS.
* If any NAS signalling message, having not successfully passed
* the integrity check, is received, then the NAS in the MME shall
* discard that message. If any NAS signalling message is received,
* as not integrity protected even though the secure exchange
* of NAS messages has been established, then the NAS shall discard
* this message.
*/
h.type = e->nas_type;
if (h.integrity_protected == 0) {
ogs_error("[%s] No Integrity Protected", mme_ue->imsi_bcd);
break;
}
if (!SECURITY_CONTEXT_IS_VALID(mme_ue)) {
ogs_error("[%s] No Security Context", mme_ue->imsi_bcd);
break;
}
/*
* If the OLD ENB_UE is being maintained in MME-UE Context,
* it deletes the S1 Context after exchanging
* the UEContextReleaseCommand/Complete with the eNB
*/
CLEAR_S1_CONTEXT(mme_ue);
emm_handle_security_mode_complete(
mme_ue, &message->emm.security_mode_complete);
ogs_kdf_kenb(mme_ue->kasme, mme_ue->ul_count.i32,
mme_ue->kenb);
ogs_kdf_nh_enb(mme_ue->kasme, mme_ue->kenb, mme_ue->nh);
mme_ue->nhcc = 1;
/* Create New GUTI */
mme_ue_new_guti(mme_ue);
mme_s6a_send_ulr(enb_ue, mme_ue);
if (mme_ue->next.m_tmsi) {
OGS_FSM_TRAN(s, &emm_state_initial_context_setup);
} else {
ogs_fatal("MME always creates new GUTI");
ogs_assert_if_reached();
OGS_FSM_TRAN(s, &emm_state_registered);
}
break;
case OGS_NAS_EPS_SECURITY_MODE_REJECT:
ogs_warn("Security mode reject : IMSI[%s] Cause[%d]",
mme_ue->imsi_bcd,
message->emm.security_mode_reject.emm_cause);
CLEAR_MME_UE_TIMER(mme_ue->t3460);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
case OGS_NAS_EPS_ATTACH_REQUEST:
ogs_warn("[%s] Attach request", mme_ue->imsi_bcd);
rv = emm_handle_attach_request(
mme_ue, &message->emm.attach_request, e->pkbuf);
if (rv != OGS_OK) {
ogs_error("emm_handle_attach_request() failed");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
mme_s6a_send_air(enb_ue, mme_ue, NULL);
OGS_FSM_TRAN(s, &emm_state_authentication);
break;
case OGS_NAS_EPS_TRACKING_AREA_UPDATE_REQUEST:
ogs_debug("Tracking area update request");
r = nas_eps_send_tau_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_SECURITY_MODE_REJECTED_UNSPECIFIED);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
case OGS_NAS_EPS_EMM_STATUS:
ogs_warn("EMM STATUS : IMSI[%s] Cause[%d]",
mme_ue->imsi_bcd, message->emm.emm_status.emm_cause);
break;
case OGS_NAS_EPS_DETACH_REQUEST:
ogs_warn("[%s] Detach request", mme_ue->imsi_bcd);
rv = emm_handle_detach_request(
mme_ue, &message->emm.detach_request_from_ue);
if (rv != OGS_OK) {
ogs_error("emm_handle_detach_request() failed");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
if (!MME_UE_HAVE_IMSI(mme_ue)) {
ogs_warn("Detach request : Unknown UE");
ogs_assert(OGS_OK ==
nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK));
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
if (!SECURITY_CONTEXT_IS_VALID(mme_ue)) {
ogs_error("No Security Context : IMSI[%s]", mme_ue->imsi_bcd);
ogs_assert(OGS_OK ==
nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK));
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
/*
* If the OLD ENB_UE is being maintained in MME-UE Context,
* it deletes the S1 Context after exchanging
* the UEContextReleaseCommand/Complete with the eNB
*/
CLEAR_S1_CONTEXT(mme_ue);
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);
}
OGS_FSM_TRAN(s, &emm_state_de_registered);
break;
default:
ogs_warn("Unknown message[%d]", message->emm.h.message_type);
break;
}
break;
case MME_EVENT_EMM_TIMER:
switch (e->timer_id) {
case MME_TIMER_T3460:
if (mme_ue->t3460.retry_count >=
mme_timer_cfg(MME_TIMER_T3460)->max_count) {
ogs_warn("Retransmission of IMSI[%s] failed. "
"Stop retransmission", mme_ue->imsi_bcd);
OGS_FSM_TRAN(&mme_ue->sm, &emm_state_exception);
r = nas_eps_send_attach_reject(mme_ue->enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_SECURITY_MODE_REJECTED_UNSPECIFIED,
OGS_NAS_ESM_CAUSE_PROTOCOL_ERROR_UNSPECIFIED);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
} else {
mme_ue->t3460.retry_count++;
r = nas_eps_send_security_mode_command(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
break;
default:
ogs_error("Unknown timer[%s:%d]",
mme_timer_get_name(e->timer_id), e->timer_id);
break;
}
break;
default:
ogs_error("Unknown event[%s]", mme_event_get_name(e));
break;
}
}
void emm_state_initial_context_setup(ogs_fsm_t *s, mme_event_t *e)
{
int r, rv, xact_count;
mme_ue_t *mme_ue = NULL;
enb_ue_t *enb_ue = NULL;
ogs_nas_eps_message_t *message = NULL;
ogs_nas_security_header_type_t h;
ogs_assert(s);
ogs_assert(e);
mme_sm_debug(e);
mme_ue = e->mme_ue;
ogs_assert(mme_ue);
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
break;
case OGS_FSM_EXIT_SIG:
break;
case MME_EVENT_EMM_MESSAGE:
message = e->nas_message;
ogs_assert(message);
enb_ue = enb_ue_cycle(mme_ue->enb_ue);
ogs_assert(enb_ue);
xact_count = mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR);
if (message->emm.h.security_header_type
== OGS_NAS_SECURITY_HEADER_FOR_SERVICE_REQUEST_MESSAGE) {
ogs_debug("Service request");
r = nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
switch (message->emm.h.message_type) {
case OGS_NAS_EPS_ATTACH_COMPLETE:
ogs_info("[%s] Attach complete", mme_ue->imsi_bcd);
/*
* TS24.301
* Section 4.4.4.3
* Integrity checking of NAS signalling messages in the MME:
*
* Once the secure exchange of NAS messages has been established
* for the NAS signalling connection, the receiving EMM or ESM entity
* in the MME shall not process any NAS signalling messages
* unless they have been successfully integrity checked by the NAS.
* If any NAS signalling message, having not successfully passed
* the integrity check, is received, then the NAS in the MME shall
* discard that message. If any NAS signalling message is received,
* as not integrity protected even though the secure exchange
* of NAS messages has been established, then the NAS shall discard
* this message.
*/
h.type = e->nas_type;
if (h.integrity_protected == 0) {
ogs_error("[%s] No Integrity Protected", mme_ue->imsi_bcd);
break;
}
if (!SECURITY_CONTEXT_IS_VALID(mme_ue)) {
ogs_error("[%s] No Security Context", mme_ue->imsi_bcd);
break;
}
/*
* If the OLD ENB_UE is being maintained in MME-UE Context,
* it deletes the S1 Context after exchanging
* the UEContextReleaseCommand/Complete with the eNB
*/
CLEAR_S1_CONTEXT(mme_ue);
CLEAR_MME_UE_TIMER(mme_ue->t3450);
rv = emm_handle_attach_complete(
mme_ue, &message->emm.attach_complete);
if (rv != OGS_OK) {
ogs_error("emm_handle_attach_complete() failed "
"in emm_state_initial_context_setup");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
/* Confirm GUTI */
if (mme_ue->next.m_tmsi)
mme_ue_confirm_guti(mme_ue);
if (MME_P_TMSI_IS_AVAILABLE(mme_ue))
ogs_assert(OGS_OK ==
sgsap_send_tmsi_reallocation_complete(mme_ue));
OGS_FSM_TRAN(s, &emm_state_registered);
break;
case OGS_NAS_EPS_TRACKING_AREA_UPDATE_COMPLETE:
ogs_debug("[%s] Tracking area update complete", mme_ue->imsi_bcd);
/*
* TS24.301
* Section 4.4.4.3
* Integrity checking of NAS signalling messages in the MME:
*
* Once the secure exchange of NAS messages has been established
* for the NAS signalling connection, the receiving EMM or ESM entity
* in the MME shall not process any NAS signalling messages
* unless they have been successfully integrity checked by the NAS.
* If any NAS signalling message, having not successfully passed
* the integrity check, is received, then the NAS in the MME shall
* discard that message. If any NAS signalling message is received,
* as not integrity protected even though the secure exchange
* of NAS messages has been established, then the NAS shall discard
* this message.
*/
h.type = e->nas_type;
if (h.integrity_protected == 0) {
ogs_error("[%s] No Integrity Protected", mme_ue->imsi_bcd);
break;
}
if (!SECURITY_CONTEXT_IS_VALID(mme_ue)) {
ogs_error("[%s] No Security Context", mme_ue->imsi_bcd);
break;
}
/*
* If the OLD ENB_UE is being maintained in MME-UE Context,
* it deletes the S1 Context after exchanging
* the UEContextReleaseCommand/Complete with the eNB
*/
CLEAR_S1_CONTEXT(mme_ue);
CLEAR_MME_UE_TIMER(mme_ue->t3450);
/* Confirm GUTI */
if (mme_ue->next.m_tmsi)
mme_ue_confirm_guti(mme_ue);
OGS_FSM_TRAN(s, &emm_state_registered);
break;
case OGS_NAS_EPS_ATTACH_REQUEST:
ogs_warn("[%s] Attach request", mme_ue->imsi_bcd);
rv = emm_handle_attach_request(
mme_ue, &message->emm.attach_request, e->pkbuf);
if (rv != OGS_OK) {
ogs_error("emm_handle_attach_request() failed");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
mme_gtp_send_delete_all_sessions(mme_ue,
OGS_GTP_DELETE_SEND_AUTHENTICATION_REQUEST);
if (!MME_SESSION_RELEASE_PENDING(mme_ue) &&
mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR) ==
xact_count) {
mme_s6a_send_air(enb_ue, mme_ue, NULL);
}
OGS_FSM_TRAN(s, &emm_state_authentication);
break;
case OGS_NAS_EPS_EMM_STATUS:
ogs_warn("EMM STATUS : IMSI[%s] Cause[%d]",
mme_ue->imsi_bcd, message->emm.emm_status.emm_cause);
break;
case OGS_NAS_EPS_DETACH_REQUEST:
ogs_warn("[%s] Detach request", mme_ue->imsi_bcd);
rv = emm_handle_detach_request(
mme_ue, &message->emm.detach_request_from_ue);
if (rv != OGS_OK) {
ogs_error("emm_handle_detach_request() failed");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
if (!MME_UE_HAVE_IMSI(mme_ue)) {
ogs_warn("Detach request : Unknown UE");
ogs_assert(OGS_OK ==
nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK));
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
if (!SECURITY_CONTEXT_IS_VALID(mme_ue)) {
ogs_error("No Security Context : IMSI[%s]", mme_ue->imsi_bcd);
ogs_assert(OGS_OK ==
nas_eps_send_service_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK));
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
/*
* If the OLD ENB_UE is being maintained in MME-UE Context,
* it deletes the S1 Context after exchanging
* the UEContextReleaseCommand/Complete with the eNB
*/
CLEAR_S1_CONTEXT(mme_ue);
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);
}
OGS_FSM_TRAN(s, &emm_state_de_registered);
break;
case OGS_NAS_EPS_SECURITY_MODE_COMPLETE:
ogs_warn("[%s] Duplicated : Security mode complete",
mme_ue->imsi_bcd);
break;
default:
ogs_warn("Unknown message[%d]", message->emm.h.message_type);
break;
}
break;
case MME_EVENT_EMM_TIMER:
switch (e->timer_id) {
case MME_TIMER_T3450:
if (mme_ue->t3450.retry_count >=
mme_timer_cfg(MME_TIMER_T3450)->max_count) {
ogs_warn("Retransmission of IMSI[%s] failed. "
"Stop retransmission", mme_ue->imsi_bcd);
OGS_FSM_TRAN(&mme_ue->sm, &emm_state_exception);
} else {
ogs_pkbuf_t *emmbuf = NULL;
mme_ue->t3450.retry_count++;
emmbuf = mme_ue->t3450.pkbuf;
if (!emmbuf) {
ogs_error("No emmbuf");
return;
}
mme_ue->t3450.pkbuf = ogs_pkbuf_copy(emmbuf);
if (!mme_ue->t3450.pkbuf) {
ogs_error("ogs_pkbuf_copy() failed");
ogs_pkbuf_free(emmbuf);
return;
}
ogs_timer_start(mme_ue->t3450.timer,
mme_timer_cfg(MME_TIMER_T3450)->duration);
r = nas_eps_send_to_downlink_nas_transport(
mme_ue->enb_ue, emmbuf);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
break;
default:
ogs_error("Unknown timer[%s:%d]",
mme_timer_get_name(e->timer_id), e->timer_id);
break;
}
break;
default:
ogs_error("Unknown event[%s]", mme_event_get_name(e));
break;
}
}
void emm_state_exception(ogs_fsm_t *s, mme_event_t *e)
{
int r, rv, xact_count;
mme_ue_t *mme_ue = NULL;
enb_ue_t *enb_ue = NULL;
ogs_nas_eps_message_t *message = NULL;
ogs_nas_security_header_type_t h;
ogs_assert(e);
mme_sm_debug(e);
mme_ue = e->mme_ue;
ogs_assert(mme_ue);
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
CLEAR_SERVICE_INDICATOR(mme_ue);
CLEAR_MME_UE_ALL_TIMERS(mme_ue);
break;
case OGS_FSM_EXIT_SIG:
break;
case MME_EVENT_EMM_MESSAGE:
message = e->nas_message;
ogs_assert(message);
enb_ue = enb_ue_cycle(mme_ue->enb_ue);
ogs_assert(enb_ue);
h.type = e->nas_type;
xact_count = mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR);
switch (message->emm.h.message_type) {
case OGS_NAS_EPS_ATTACH_REQUEST:
ogs_warn("[%s] Attach request", mme_ue->imsi_bcd);
rv = emm_handle_attach_request(
mme_ue, &message->emm.attach_request, e->pkbuf);
if (rv != OGS_OK) {
ogs_error("emm_handle_attach_request() failed");
OGS_FSM_TRAN(s, emm_state_exception);
break;
}
if (!MME_UE_HAVE_IMSI(mme_ue)) {
CLEAR_MME_UE_TIMER(mme_ue->t3470);
r = nas_eps_send_identity_request(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_de_registered);
break;
}
if (h.integrity_protected && SECURITY_CONTEXT_IS_VALID(mme_ue)) {
/*
* If the OLD ENB_UE is being maintained in MME-UE Context,
* it deletes the S1 Context after exchanging
* the UEContextReleaseCommand/Complete with the eNB
*/
CLEAR_S1_CONTEXT(mme_ue);
mme_gtp_send_delete_all_sessions(mme_ue,
OGS_GTP_DELETE_HANDLE_PDN_CONNECTIVITY_REQUEST);
if (!MME_SESSION_RELEASE_PENDING(mme_ue) &&
mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR) ==
xact_count) {
rv = nas_eps_send_emm_to_esm(mme_ue,
&mme_ue->pdn_connectivity_request);
if (rv != OGS_OK) {
ogs_error("nas_eps_send_emm_to_esm() failed");
r = nas_eps_send_attach_reject(enb_ue, mme_ue,
OGS_NAS_EMM_CAUSE_PROTOCOL_ERROR_UNSPECIFIED,
OGS_NAS_ESM_CAUSE_PROTOCOL_ERROR_UNSPECIFIED);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
OGS_FSM_TRAN(s, &emm_state_exception);
break;
}
}
OGS_FSM_TRAN(s, &emm_state_initial_context_setup);
} else {
mme_gtp_send_delete_all_sessions(mme_ue,
OGS_GTP_DELETE_SEND_AUTHENTICATION_REQUEST);
if (!MME_SESSION_RELEASE_PENDING(mme_ue) &&
mme_ue_xact_count(mme_ue, OGS_GTP_LOCAL_ORIGINATOR) ==
xact_count) {
mme_s6a_send_air(enb_ue, mme_ue, NULL);
}
OGS_FSM_TRAN(s, &emm_state_authentication);
}
break;
default:
ogs_warn("Unknown message[%d]", message->emm.h.message_type);
}
break;
default:
ogs_error("Unknown event[%s]", mme_event_get_name(e));
}
}
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