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open5gs/src/mme/mme-s6a-handler.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 "nas-path.h"
#include "s1ap-path.h"
#include "sgsap-path.h"
#include "mme-path.h"
#include "mme-sm.h"
#include "mme-s6a-handler.h"
/* Unfortunately fd doesn't distinguish
* between result-code and experimental-result-code.
*
* However, e.g. 5004 has different meaning
* if used in result-code than in experimental-result-code */
static uint8_t emm_cause_from_diameter(
const uint32_t *dia_err, const uint32_t *dia_exp_err);
static uint8_t mme_ue_session_from_slice_data(mme_ue_t *mme_ue,
ogs_slice_data_t *slice_data);
uint8_t mme_s6a_handle_aia(
mme_ue_t *mme_ue, ogs_diam_s6a_message_t *s6a_message)
{
int r;
ogs_diam_s6a_aia_message_t *aia_message = NULL;
ogs_diam_e_utran_vector_t *e_utran_vector = NULL;
ogs_assert(mme_ue);
ogs_assert(s6a_message);
aia_message = &s6a_message->aia_message;
ogs_assert(aia_message);
e_utran_vector = &aia_message->e_utran_vector;
ogs_assert(e_utran_vector);
if (s6a_message->result_code != ER_DIAMETER_SUCCESS) {
ogs_warn("Authentication Information failed [%d]",
s6a_message->result_code);
return emm_cause_from_diameter(s6a_message->err, s6a_message->exp_err);
}
mme_ue->xres_len = e_utran_vector->xres_len;
memcpy(mme_ue->xres, e_utran_vector->xres, mme_ue->xres_len);
memcpy(mme_ue->kasme, e_utran_vector->kasme, OGS_SHA256_DIGEST_SIZE);
memcpy(mme_ue->rand, e_utran_vector->rand, OGS_RAND_LEN);
memcpy(mme_ue->autn, e_utran_vector->autn, OGS_AUTN_LEN);
CLEAR_MME_UE_TIMER(mme_ue->t3460);
if (mme_ue->nas_eps.ksi == OGS_NAS_KSI_NO_KEY_IS_AVAILABLE)
mme_ue->nas_eps.ksi = 0;
r = nas_eps_send_authentication_request(mme_ue);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
return OGS_NAS_EMM_CAUSE_REQUEST_ACCEPTED;
}
uint8_t mme_s6a_handle_ula(
mme_ue_t *mme_ue, ogs_diam_s6a_message_t *s6a_message)
{
ogs_diam_s6a_ula_message_t *ula_message = NULL;
ogs_subscription_data_t *subscription_data = NULL;
ogs_slice_data_t *slice_data = NULL;
int r, rv, num_of_session;
ogs_assert(mme_ue);
ogs_assert(s6a_message);
ula_message = &s6a_message->ula_message;
ogs_assert(ula_message);
subscription_data = &ula_message->subscription_data;
ogs_assert(subscription_data);
if (s6a_message->result_code != ER_DIAMETER_SUCCESS) {
ogs_error("Update Location failed [%d]", s6a_message->result_code);
return emm_cause_from_diameter(s6a_message->err, s6a_message->exp_err);
}
ogs_assert(subscription_data->num_of_slice == 1);
slice_data = &subscription_data->slice[0];
memcpy(&mme_ue->ambr, &subscription_data->ambr, sizeof(ogs_bitrate_t));
mme_session_remove_all(mme_ue);
num_of_session = mme_ue_session_from_slice_data(mme_ue, slice_data);
if (num_of_session == 0) {
ogs_error("No Session");
return OGS_NAS_EMM_CAUSE_SEVERE_NETWORK_FAILURE;
}
mme_ue->num_of_session = num_of_session;
mme_ue->context_identifier = slice_data->context_identifier;
if (mme_ue->nas_eps.type == MME_EPS_TYPE_ATTACH_REQUEST) {
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");
return OGS_NAS_EMM_CAUSE_PROTOCOL_ERROR_UNSPECIFIED;
}
} else if (mme_ue->nas_eps.type == MME_EPS_TYPE_TAU_REQUEST) {
if (!SESSION_CONTEXT_IS_AVAILABLE(mme_ue)) {
ogs_warn("No PDN Connection : UE[%s]", mme_ue->imsi_bcd);
return OGS_NAS_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK;
}
if (!ACTIVE_EPS_BEARERS_IS_AVAIABLE(mme_ue)) {
ogs_warn("No active EPS bearers : IMSI[%s]", mme_ue->imsi_bcd);
return OGS_NAS_EMM_CAUSE_NO_EPS_BEARER_CONTEXT_ACTIVATED;
}
r = nas_eps_send_tau_accept(mme_ue,
S1AP_ProcedureCode_id_InitialContextSetup);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
} else {
ogs_error("Invalid Type[%d]", mme_ue->nas_eps.type);
return OGS_NAS_EMM_CAUSE_PROTOCOL_ERROR_UNSPECIFIED;
}
return OGS_NAS_EMM_CAUSE_REQUEST_ACCEPTED;
}
uint8_t mme_s6a_handle_pua(
mme_ue_t *mme_ue, ogs_diam_s6a_message_t *s6a_message)
{
ogs_diam_s6a_pua_message_t *pua_message = NULL;
ogs_assert(mme_ue);
ogs_assert(s6a_message);
pua_message = &s6a_message->pua_message;
ogs_assert(pua_message);
if (s6a_message->result_code != ER_DIAMETER_SUCCESS) {
ogs_error("Purge UE failed for IMSI[%s] [%d]", mme_ue->imsi_bcd,
s6a_message->result_code);
MME_UE_CHECK(OGS_LOG_ERROR, mme_ue);
mme_ue_remove(mme_ue);
return OGS_ERROR;
}
if (pua_message->pua_flags & OGS_DIAM_S6A_PUA_FLAGS_FREEZE_MTMSI)
ogs_debug("Freeze M-TMSI requested but not implemented.");
MME_UE_CHECK(OGS_LOG_DEBUG, mme_ue);
mme_ue_remove(mme_ue);
return OGS_OK;
}
uint8_t mme_s6a_handle_idr(
mme_ue_t *mme_ue, ogs_diam_s6a_message_t *s6a_message)
{
ogs_diam_s6a_idr_message_t *idr_message = NULL;
ogs_subscription_data_t *subscription_data = NULL;
ogs_slice_data_t *slice_data = NULL;
int num_of_session;
ogs_assert(mme_ue);
ogs_assert(s6a_message);
idr_message = &s6a_message->idr_message;
ogs_assert(idr_message);
subscription_data = &idr_message->subscription_data;
ogs_assert(subscription_data);
if (idr_message->subdatamask & OGS_DIAM_S6A_SUBDATA_UEAMBR) {
memcpy(&mme_ue->ambr, &subscription_data->ambr, sizeof(ogs_bitrate_t));
}
if (idr_message->subdatamask & OGS_DIAM_S6A_SUBDATA_APN_CONFIG) {
ogs_assert(subscription_data->num_of_slice == 1);
slice_data = &subscription_data->slice[0];
if (slice_data->all_apn_config_inc ==
OGS_ALL_APN_CONFIGURATIONS_INCLUDED) {
mme_session_remove_all(mme_ue);
num_of_session = mme_ue_session_from_slice_data(mme_ue, slice_data);
if (num_of_session == 0) {
ogs_error("No Session");
return OGS_ERROR;
}
mme_ue->num_of_session = num_of_session;
} else {
ogs_error ("[%d] Partial APN-Configuration Not Supported in IDR.",
slice_data->all_apn_config_inc);
return OGS_ERROR;
}
mme_ue->context_identifier = slice_data->context_identifier;
}
return OGS_OK;
}
void mme_s6a_handle_clr(mme_ue_t *mme_ue, ogs_diam_s6a_message_t *s6a_message)
{
int r;
ogs_diam_s6a_clr_message_t *clr_message = NULL;
ogs_assert(mme_ue);
ogs_assert(s6a_message);
clr_message = &s6a_message->clr_message;
ogs_assert(clr_message);
mme_ue = mme_ue_cycle(mme_ue);
if (!mme_ue) {
ogs_warn("UE(mme-ue) context has already been removed");
return;
}
/*
* This causes issues in this scenario:
* 1. UE attaches
* 2. UE detaches (Airplane Mode)
* 3. Cancel Location is triggered by HSS
*
* If Cancel Locations are performed, UE(mme-ue) context must be removed.
*/
if (OGS_FSM_CHECK(&mme_ue->sm, emm_state_de_registered)) {
ogs_warn("UE has already been de-registered");
MME_UE_CHECK(OGS_LOG_ERROR, mme_ue);
mme_ue_remove(mme_ue);
return;
}
/* Set EPS Detach */
memset(&mme_ue->nas_eps.detach, 0, sizeof(ogs_nas_detach_type_t));
if (clr_message->clr_flags & OGS_DIAM_S6A_CLR_FLAGS_REATTACH_REQUIRED)
mme_ue->nas_eps.detach.value =
OGS_NAS_DETACH_TYPE_TO_UE_RE_ATTACH_REQUIRED;
else
mme_ue->nas_eps.detach.value =
OGS_NAS_DETACH_TYPE_TO_UE_RE_ATTACH_NOT_REQUIRED;
/* 1. MME initiated detach request to the UE.
* (nas_eps.type = MME_EPS_TYPE_DETACH_REQUEST_TO_UE)
* 2. If UE is IDLE, Paging sent to the UE
* 3. If UE is wake-up, UE will send Server Request.
* (nas_eps.type = MME_EPS_TYPE_SERVICE_REQUEST)
*
* So, we will lose the MME_EPS_TYPE_DETACH_REQUEST_TO_UE.
*
* We need more variable(detach_type)
* to keep Detach-Type whether UE-initiated or MME-initiaed. */
mme_ue->nas_eps.type = MME_EPS_TYPE_DETACH_REQUEST_TO_UE;
ogs_debug(" OGS_NAS_EPS TYPE[%d]", mme_ue->nas_eps.type);
switch (clr_message->cancellation_type) {
case OGS_DIAM_S6A_CT_SUBSCRIPTION_WITHDRAWL:
mme_ue->detach_type = MME_DETACH_TYPE_HSS_EXPLICIT;
/*
* Before sending Detach-Request,
* we need to check whether UE is IDLE or not.
*/
if (ECM_IDLE(mme_ue)) {
MME_STORE_PAGING_INFO(mme_ue,
MME_PAGING_TYPE_DETACH_TO_UE, NULL);
r = s1ap_send_paging(mme_ue, S1AP_CNDomain_ps);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
} else {
MME_CLEAR_PAGING_INFO(mme_ue);
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;
case OGS_DIAM_S6A_CT_MME_UPDATE_PROCEDURE:
case OGS_DIAM_S6A_CT_SGSN_UPDATE_PROCEDURE:
mme_ue->detach_type = MME_DETACH_TYPE_HSS_IMPLICIT;
/* 3GPP TS 23.401 D.3.5.5 8), 3GPP TS 23.060 6.9.1.2.2 8):
* "When the timer described in step 2 is running, the MM and PDP/EPS
* Bearer Contexts and any affected S-GW resources are removed when the
* timer expires and the SGSN received a Cancel Location".
*/
if (mme_ue->gn.t_gn_holding->running) {
ogs_debug("Gn Holding Timer is running, delay removing UE resources");
break;
}
/*
* There is no need to send NAS or S1AP message to the UE.
* So, we don't have to check whether UE is IDLE or not.
*/
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("Unsupported Cancellation-Type [%d]",
clr_message->cancellation_type);
ogs_assert_if_reached();
break;
}
}
static uint8_t mme_ue_session_from_slice_data(mme_ue_t *mme_ue,
ogs_slice_data_t *slice_data)
{
int i;
for (i = 0; i < slice_data->num_of_session; i++) {
if (i >= OGS_MAX_NUM_OF_SESS) {
ogs_warn("Ignore max session count overflow [%d>=%d]",
slice_data->num_of_session, OGS_MAX_NUM_OF_SESS);
break;
}
if (slice_data->session[i].name) {
mme_ue->session[i].name = ogs_strdup(slice_data->session[i].name);
ogs_assert(mme_ue->session[i].name);
}
mme_ue->session[i].context_identifier =
slice_data->session[i].context_identifier;
if (slice_data->session[i].session_type == OGS_PDU_SESSION_TYPE_IPV4 ||
slice_data->session[i].session_type == OGS_PDU_SESSION_TYPE_IPV6 ||
slice_data->session[i].session_type ==
OGS_PDU_SESSION_TYPE_IPV4V6) {
mme_ue->session[i].session_type =
slice_data->session[i].session_type;
} else {
ogs_error("Invalid PDN_TYPE[%d]",
slice_data->session[i].session_type);
if (mme_ue->session[i].name)
ogs_free(mme_ue->session[i].name);
break;
}
memcpy(&mme_ue->session[i].paa, &slice_data->session[i].paa,
sizeof(mme_ue->session[i].paa));
memcpy(&mme_ue->session[i].qos, &slice_data->session[i].qos,
sizeof(mme_ue->session[i].qos));
memcpy(&mme_ue->session[i].ambr, &slice_data->session[i].ambr,
sizeof(mme_ue->session[i].ambr));
memcpy(&mme_ue->session[i].smf_ip, &slice_data->session[i].smf_ip,
sizeof(mme_ue->session[i].smf_ip));
memcpy(&mme_ue->session[i].charging_characteristics,
&slice_data->session[i].charging_characteristics,
sizeof(mme_ue->session[i].charging_characteristics));
mme_ue->session[i].charging_characteristics_presence =
slice_data->session[i].charging_characteristics_presence;
}
return i;
}
/* 3GPP TS 29.272 Annex A; Table A.1:
* Mapping from S6a error codes to NAS Cause Codes */
static uint8_t emm_cause_from_diameter(
const uint32_t *dia_err, const uint32_t *dia_exp_err)
{
if (dia_exp_err) {
switch (*dia_exp_err) {
case OGS_DIAM_S6A_ERROR_USER_UNKNOWN: /* 5001 */
return OGS_NAS_EMM_CAUSE_PLMN_NOT_ALLOWED;
case OGS_DIAM_S6A_ERROR_UNKNOWN_EPS_SUBSCRIPTION: /* 5420 */
/* FIXME: Error diagnostic? */
return OGS_NAS_EMM_CAUSE_NO_SUITABLE_CELLS_IN_TRACKING_AREA;
case OGS_DIAM_S6A_ERROR_RAT_NOT_ALLOWED: /* 5421 */
return OGS_NAS_EMM_CAUSE_ROAMING_NOT_ALLOWED_IN_THIS_TRACKING_AREA;
case OGS_DIAM_S6A_ERROR_ROAMING_NOT_ALLOWED: /* 5004 */
return OGS_NAS_EMM_CAUSE_PLMN_NOT_ALLOWED;
/* return OGS_NAS_EMM_CAUSE_EPS_SERVICES_NOT_ALLOWED_IN_THIS_PLMN;
* (ODB_HPLMN_APN) */
/* return OGS_NAS_EMM_CAUSE_ESM_FAILURE; (ODB_ALL_APN) */
case OGS_DIAM_S6A_AUTHENTICATION_DATA_UNAVAILABLE: /* 4181 */
return OGS_NAS_EMM_CAUSE_NETWORK_FAILURE;
}
}
if (dia_err) {
switch (*dia_err) {
case ER_DIAMETER_AUTHORIZATION_REJECTED: /* 5003 */
case ER_DIAMETER_UNABLE_TO_DELIVER: /* 3002 */
case ER_DIAMETER_REALM_NOT_SERVED: /* 3003 */
return OGS_NAS_EMM_CAUSE_NO_SUITABLE_CELLS_IN_TRACKING_AREA;
case ER_DIAMETER_UNABLE_TO_COMPLY: /* 5012 */
case ER_DIAMETER_INVALID_AVP_VALUE: /* 5004 */
case ER_DIAMETER_AVP_UNSUPPORTED: /* 5001 */
case ER_DIAMETER_MISSING_AVP: /* 5005 */
case ER_DIAMETER_RESOURCES_EXCEEDED: /* 5006 */
case ER_DIAMETER_AVP_OCCURS_TOO_MANY_TIMES: /* 5009 */
return OGS_NAS_EMM_CAUSE_NETWORK_FAILURE;
}
}
ogs_error("Unexpected Diameter Result Code %d/%d, defaulting to severe "
"network failure",
dia_err ? *dia_err : -1, dia_exp_err ? *dia_exp_err : -1);
return OGS_NAS_EMM_CAUSE_SEVERE_NETWORK_FAILURE;
}
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