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open5gs/src/mme/esm-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 "mme-sm.h"
#include "mme-fd-path.h"
#include "emm-handler.h"
#include "esm-build.h"
#include "esm-handler.h"
#include "mme-s11-handler.h"
#include "s1ap-path.h"
#include "nas-path.h"
#include "mme-gtp-path.h"
#undef OGS_LOG_DOMAIN
#define OGS_LOG_DOMAIN __esm_log_domain
static uint8_t gtp_cause_from_esm(uint8_t esm_cause)
{
switch (esm_cause) {
case ESM_CAUSE_SEMANTIC_ERROR_IN_THE_TFT_OPERATION:
return OGS_GTP2_CAUSE_SEMANTIC_ERROR_IN_THE_TFT_OPERATION;
case ESM_CAUSE_SYNTACTICAL_ERROR_IN_THE_TFT_OPERATION:
return OGS_GTP2_CAUSE_SYNTACTIC_ERROR_IN_THE_TFT_OPERATION;
case ESM_CAUSE_SYNTACTICAL_ERROR_IN_PACKET_FILTERS:
return OGS_GTP2_CAUSE_SYNTACTIC_ERRORS_IN_PACKET_FILTER;
case ESM_CAUSE_SEMANTIC_ERRORS_IN_PACKET_FILTERS:
return OGS_GTP2_CAUSE_SEMANTIC_ERRORS_IN_PACKET_FILTER;
default:
break;
}
return OGS_GTP2_CAUSE_SYSTEM_FAILURE;
}
void esm_state_initial(ogs_fsm_t *s, mme_event_t *e)
{
ogs_assert(s);
mme_sm_debug(e);
OGS_FSM_TRAN(s, &esm_state_inactive);
}
void esm_state_final(ogs_fsm_t *s, mme_event_t *e)
{
ogs_assert(s);
mme_sm_debug(e);
}
void esm_state_inactive(ogs_fsm_t *s, mme_event_t *e)
{
int rv;
mme_ue_t *mme_ue = NULL;
mme_sess_t *sess = NULL;
mme_bearer_t *bearer = NULL;
ogs_nas_eps_message_t *message = NULL;
ogs_nas_security_header_type_t h;
ogs_nas_eps_activate_dedicated_eps_bearer_context_reject_t
*activate_dedicated_eps_bearer_context_reject = NULL;
ogs_assert(s);
ogs_assert(e);
mme_sm_debug(e);
bearer = e->bearer;
ogs_assert(bearer);
sess = bearer->sess;
ogs_assert(sess);
mme_ue = sess->mme_ue;
ogs_assert(mme_ue);
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
CLEAR_BEARER_ALL_TIMERS(bearer);
break;
case OGS_FSM_EXIT_SIG:
break;
case MME_EVT_ESM_MESSAGE:
message = e->nas_message;
ogs_assert(message);
switch (message->esm.h.message_type) {
case OGS_NAS_EPS_PDN_CONNECTIVITY_REQUEST:
ogs_debug("PDN Connectivity request");
ogs_debug(" IMSI[%s] PTI[%d] EBI[%d]",
mme_ue->imsi_bcd, sess->pti, bearer->ebi);
rv = esm_handle_pdn_connectivity_request(
bearer, &message->esm.pdn_connectivity_request,
e->create_action);
if (rv != OGS_OK) {
OGS_FSM_TRAN(s, esm_state_exception);
break;
}
break;
case OGS_NAS_EPS_PDN_DISCONNECT_REQUEST:
ogs_debug("PDN disconnect request");
ogs_debug(" IMSI[%s] PTI[%d] EBI[%d]",
mme_ue->imsi_bcd, sess->pti, bearer->ebi);
if (MME_HAVE_SGW_S1U_PATH(sess)) {
ogs_assert(OGS_OK ==
mme_gtp_send_delete_session_request(sess,
OGS_GTP_DELETE_SEND_DEACTIVATE_BEARER_CONTEXT_REQUEST));
} else {
ogs_assert(OGS_OK ==
nas_eps_send_deactivate_bearer_context_request(bearer));
}
OGS_FSM_TRAN(s, esm_state_pdn_will_disconnect);
break;
case OGS_NAS_EPS_ESM_INFORMATION_RESPONSE:
ogs_debug("ESM information response");
ogs_debug(" IMSI[%s] PTI[%d] EBI[%d]",
mme_ue->imsi_bcd, sess->pti, bearer->ebi);
CLEAR_BEARER_TIMER(bearer->t3489);
h.type = e->nas_type;
if (h.integrity_protected == 0) {
ogs_error("[%s] No Integrity Protected", mme_ue->imsi_bcd);
ogs_assert(OGS_OK ==
nas_eps_send_attach_reject(mme_ue,
EMM_CAUSE_SECURITY_MODE_REJECTED_UNSPECIFIED,
ESM_CAUSE_PROTOCOL_ERROR_UNSPECIFIED));
ogs_assert(mme_ue->enb_ue);
ogs_assert(OGS_OK ==
s1ap_send_ue_context_release_command(mme_ue->enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0));
OGS_FSM_TRAN(s, &esm_state_exception);
break;
}
if (!SECURITY_CONTEXT_IS_VALID(mme_ue)) {
ogs_warn("[%s] No Security Context", mme_ue->imsi_bcd);
ogs_assert(OGS_OK ==
nas_eps_send_attach_reject(mme_ue,
EMM_CAUSE_SECURITY_MODE_REJECTED_UNSPECIFIED,
ESM_CAUSE_PROTOCOL_ERROR_UNSPECIFIED));
ogs_assert(mme_ue->enb_ue);
ogs_assert(OGS_OK ==
s1ap_send_ue_context_release_command(mme_ue->enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0));
OGS_FSM_TRAN(s, &esm_state_exception);
break;
}
rv = esm_handle_information_response(
sess, &message->esm.esm_information_response);
if (rv != OGS_OK) {
OGS_FSM_TRAN(s, esm_state_exception);
break;
}
break;
case OGS_NAS_EPS_ACTIVATE_DEFAULT_EPS_BEARER_CONTEXT_ACCEPT:
ogs_debug("Activate default EPS bearer context accept");
ogs_debug(" IMSI[%s] PTI[%d] EBI[%d]",
mme_ue->imsi_bcd, sess->pti, bearer->ebi);
/* Check if Initial Context Setup Response or
* E-RAB Setup Response is received */
if (MME_HAVE_ENB_S1U_PATH(bearer)) {
ogs_assert(OGS_OK ==
mme_gtp_send_modify_bearer_request(bearer, 0));
}
nas_eps_send_activate_all_dedicated_bearers(bearer);
OGS_FSM_TRAN(s, esm_state_active);
break;
case OGS_NAS_EPS_ACTIVATE_DEDICATED_EPS_BEARER_CONTEXT_ACCEPT:
ogs_debug("Activate dedicated EPS bearer context accept");
ogs_debug(" IMSI[%s] PTI[%d] EBI[%d]",
mme_ue->imsi_bcd, sess->pti, bearer->ebi);
/* Check if Initial Context Setup Response or
* E-RAB Setup Response is received */
if (MME_HAVE_ENB_S1U_PATH(bearer)) {
ogs_assert(OGS_OK ==
mme_gtp_send_create_bearer_response(
bearer, OGS_GTP2_CAUSE_REQUEST_ACCEPTED));
}
OGS_FSM_TRAN(s, esm_state_active);
break;
case OGS_NAS_EPS_ACTIVATE_DEDICATED_EPS_BEARER_CONTEXT_REJECT:
ogs_error("Activate dedicated EPS bearer context reject");
ogs_error(" IMSI[%s] PTI[%d] EBI[%d]",
mme_ue->imsi_bcd, sess->pti, bearer->ebi);
activate_dedicated_eps_bearer_context_reject =
&message->esm.activate_dedicated_eps_bearer_context_reject;
ogs_assert(activate_dedicated_eps_bearer_context_reject);
ogs_assert(OGS_OK ==
mme_gtp_send_create_bearer_response(bearer,
gtp_cause_from_esm(
activate_dedicated_eps_bearer_context_reject->esm_cause)));
OGS_FSM_TRAN(s, esm_state_bearer_deactivated);
break;
default:
ogs_error("Unknown message(type:%d)", message->esm.h.message_type);
break;
}
break;
case MME_EVT_ESM_TIMER:
switch (e->timer_id) {
case MME_TIMER_T3489:
if (bearer->t3489.retry_count >=
mme_timer_cfg(MME_TIMER_T3489)->max_count) {
ogs_warn("Retransmission of IMSI[%s] failed. "
"Stop retransmission", mme_ue->imsi_bcd);
OGS_FSM_TRAN(&bearer->sm, &esm_state_exception);
ogs_assert(OGS_OK ==
nas_eps_send_pdn_connectivity_reject(sess,
ESM_CAUSE_ESM_INFORMATION_NOT_RECEIVED,
e->create_action));
} else {
rv = nas_eps_send_esm_information_request(bearer);
if (rv == OGS_OK) {
bearer->t3489.retry_count++;
} else {
ogs_error("nas_eps_send_esm_information_request() failed");
OGS_FSM_TRAN(&bearer->sm, &esm_state_exception);
}
}
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 esm_state_active(ogs_fsm_t *s, mme_event_t *e)
{
int rv;
mme_ue_t *mme_ue = NULL;
mme_sess_t *sess = NULL;
mme_bearer_t *bearer = NULL;
ogs_nas_eps_message_t *message = NULL;
ogs_assert(s);
ogs_assert(e);
mme_sm_debug(e);
bearer = e->bearer;
ogs_assert(bearer);
sess = bearer->sess;
ogs_assert(sess);
mme_ue = sess->mme_ue;
ogs_assert(mme_ue);
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
break;
case OGS_FSM_EXIT_SIG:
break;
case MME_EVT_ESM_MESSAGE:
message = e->nas_message;
ogs_assert(message);
switch (message->esm.h.message_type) {
case OGS_NAS_EPS_PDN_CONNECTIVITY_REQUEST:
ogs_debug("PDN Connectivity request");
ogs_debug(" IMSI[%s] PTI[%d] EBI[%d]",
mme_ue->imsi_bcd, sess->pti, bearer->ebi);
rv = esm_handle_pdn_connectivity_request(
bearer, &message->esm.pdn_connectivity_request,
e->create_action);
if (rv != OGS_OK) {
OGS_FSM_TRAN(s, esm_state_exception);
break;
}
OGS_FSM_TRAN(s, esm_state_inactive);
break;
case OGS_NAS_EPS_PDN_DISCONNECT_REQUEST:
ogs_debug("PDN disconnect request");
ogs_debug(" IMSI[%s] PTI[%d] EBI[%d]",
mme_ue->imsi_bcd, sess->pti, bearer->ebi);
if (MME_HAVE_SGW_S1U_PATH(sess)) {
ogs_assert(OGS_OK ==
mme_gtp_send_delete_session_request(sess,
OGS_GTP_DELETE_SEND_DEACTIVATE_BEARER_CONTEXT_REQUEST));
} else {
ogs_assert(OGS_OK ==
nas_eps_send_deactivate_bearer_context_request(bearer));
}
OGS_FSM_TRAN(s, esm_state_pdn_will_disconnect);
break;
case OGS_NAS_EPS_MODIFY_EPS_BEARER_CONTEXT_ACCEPT:
ogs_debug("Modify EPS bearer context accept");
ogs_debug(" IMSI[%s] PTI[%d] EBI[%d]",
mme_ue->imsi_bcd, sess->pti, bearer->ebi);
ogs_assert(OGS_OK ==
mme_gtp_send_update_bearer_response(
bearer, OGS_GTP2_CAUSE_REQUEST_ACCEPTED));
break;
case OGS_NAS_EPS_DEACTIVATE_EPS_BEARER_CONTEXT_ACCEPT:
ogs_debug("Deactivate EPS bearer "
"context accept");
ogs_debug(" IMSI[%s] PTI[%d] EBI[%d]",
mme_ue->imsi_bcd, sess->pti, bearer->ebi);
ogs_assert(OGS_OK ==
mme_gtp_send_delete_bearer_response(
bearer, OGS_GTP2_CAUSE_REQUEST_ACCEPTED));
OGS_FSM_TRAN(s, esm_state_bearer_deactivated);
break;
case OGS_NAS_EPS_BEARER_RESOURCE_ALLOCATION_REQUEST:
ogs_debug("Bearer resource allocation request");
ogs_debug(" IMSI[%s] PTI[%d] EBI[%d]",
mme_ue->imsi_bcd, sess->pti, bearer->ebi);
esm_handle_bearer_resource_allocation_request(bearer, message);
break;
case OGS_NAS_EPS_BEARER_RESOURCE_MODIFICATION_REQUEST:
ogs_debug("Bearer resource modification request");
ogs_debug(" IMSI[%s] PTI[%d] EBI[%d]",
mme_ue->imsi_bcd, sess->pti, bearer->ebi);
esm_handle_bearer_resource_modification_request(bearer, message);
break;
default:
ogs_error("Unknown message(type:%d)",
message->esm.h.message_type);
break;
}
break;
default:
ogs_error("Unknown event %s", mme_event_get_name(e));
break;
}
}
void esm_state_pdn_will_disconnect(ogs_fsm_t *s, mme_event_t *e)
{
int rv;
mme_ue_t *mme_ue = NULL;
mme_sess_t *sess = NULL;
mme_bearer_t *bearer = NULL;
ogs_nas_eps_message_t *message = NULL;
ogs_assert(s);
ogs_assert(e);
mme_sm_debug(e);
bearer = e->bearer;
ogs_assert(bearer);
sess = bearer->sess;
ogs_assert(sess);
mme_ue = sess->mme_ue;
ogs_assert(mme_ue);
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
break;
case OGS_FSM_EXIT_SIG:
break;
case MME_EVT_ESM_MESSAGE:
message = e->nas_message;
ogs_assert(message);
switch (message->esm.h.message_type) {
case OGS_NAS_EPS_DEACTIVATE_EPS_BEARER_CONTEXT_ACCEPT:
ogs_debug("[D] Deactivate EPS bearer "
"context accept");
ogs_debug(" IMSI[%s] PTI[%d] EBI[%d]",
mme_ue->imsi_bcd, sess->pti, bearer->ebi);
OGS_FSM_TRAN(s, esm_state_pdn_did_disconnect);
break;
case OGS_NAS_EPS_PDN_CONNECTIVITY_REQUEST:
ogs_debug("PDN Connectivity request");
ogs_debug(" IMSI[%s] PTI[%d] EBI[%d]",
mme_ue->imsi_bcd, sess->pti, bearer->ebi);
rv = esm_handle_pdn_connectivity_request(
bearer, &message->esm.pdn_connectivity_request,
e->create_action);
if (rv != OGS_OK) {
OGS_FSM_TRAN(s, esm_state_exception);
break;
}
OGS_FSM_TRAN(s, esm_state_inactive);
break;
default:
ogs_error("Unknown message(type:%d)",
message->esm.h.message_type);
break;
}
break;
default:
ogs_error("Unknown event %s", mme_event_get_name(e));
break;
}
}
void esm_state_pdn_did_disconnect(ogs_fsm_t *s, mme_event_t *e)
{
ogs_assert(e);
mme_sm_debug(e);
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
break;
case OGS_FSM_EXIT_SIG:
break;
default:
ogs_error("Unknown event %s", mme_event_get_name(e));
break;
}
}
void esm_state_bearer_deactivated(ogs_fsm_t *s, mme_event_t *e)
{
ogs_assert(e);
mme_sm_debug(e);
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
break;
case OGS_FSM_EXIT_SIG:
break;
default:
ogs_error("Unknown event %s", mme_event_get_name(e));
break;
}
}
void esm_state_exception(ogs_fsm_t *s, mme_event_t *e)
{
mme_bearer_t *bearer = NULL;
ogs_assert(e);
mme_sm_debug(e);
bearer = e->bearer;
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
CLEAR_BEARER_ALL_TIMERS(bearer);
break;
case OGS_FSM_EXIT_SIG:
break;
default:
ogs_error("Unknown event %s", mme_event_get_name(e));
break;
}
}
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