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gsm-sm.c
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/*
* Copyright (C) 2019-2022 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 "binding.h"
#include "sbi-path.h"
#include "gn-handler.h"
#include "gx-handler.h"
#include "gy-handler.h"
#include "n4-handler.h"
#include "s5c-handler.h"
#include "nnrf-handler.h"
#include "nsmf-handler.h"
#include "nudm-handler.h"
#include "npcf-handler.h"
#include "namf-handler.h"
#include "gsm-handler.h"
#include "ngap-handler.h"
#include "gtp-path.h"
#include "pfcp-path.h"
#include "ngap-path.h"
#include "fd-path.h"
static uint8_t gtp_cause_from_diameter(uint8_t gtp_version,
const uint32_t dia_err, const uint32_t *dia_exp_err)
{
switch (gtp_version) {
case 1:
switch (dia_err) {
case OGS_DIAM_UNKNOWN_SESSION_ID:
return OGS_GTP1_CAUSE_APN_ACCESS_DENIED;
case ER_DIAMETER_UNABLE_TO_DELIVER:
return OGS_GTP1_CAUSE_USER_AUTHENTICATION_FAILED;
}
break;
case 2:
switch (dia_err) {
case OGS_DIAM_UNKNOWN_SESSION_ID:
return OGS_GTP2_CAUSE_APN_ACCESS_DENIED_NO_SUBSCRIPTION;
case ER_DIAMETER_UNABLE_TO_DELIVER:
return OGS_GTP2_CAUSE_REMOTE_PEER_NOT_RESPONDING;
}
break;
}
ogs_error("Unexpected Diameter Result Code %d/%d, defaulting to severe "
"network failure",
dia_err, dia_exp_err ? *dia_exp_err : -1);
switch (gtp_version) {
case 1:
return OGS_GTP1_CAUSE_USER_AUTHENTICATION_FAILED;
case 2:
default:
return OGS_GTP2_CAUSE_UE_NOT_AUTHORISED_BY_OCS_OR_EXTERNAL_AAA_SERVER;
}
}
static void send_gtp_create_err_msg(const smf_sess_t *sess,
ogs_gtp_xact_t *gtp_xact, uint8_t gtp_cause)
{
if (gtp_xact->gtp_version == 1)
ogs_gtp1_send_error_message(gtp_xact, sess->sgw_s5c_teid,
OGS_GTP1_CREATE_PDP_CONTEXT_RESPONSE_TYPE, gtp_cause);
else
ogs_gtp2_send_error_message(gtp_xact, sess->sgw_s5c_teid,
OGS_GTP2_CREATE_SESSION_RESPONSE_TYPE, gtp_cause);
}
static void send_gtp_delete_err_msg(const smf_sess_t *sess,
ogs_gtp_xact_t *gtp_xact, uint8_t gtp_cause)
{
if (gtp_xact->gtp_version == 1)
ogs_gtp1_send_error_message(gtp_xact, sess->sgw_s5c_teid,
OGS_GTP1_DELETE_PDP_CONTEXT_RESPONSE_TYPE, gtp_cause);
else
ogs_gtp2_send_error_message(gtp_xact, sess->sgw_s5c_teid,
OGS_GTP2_DELETE_SESSION_RESPONSE_TYPE, gtp_cause);
}
static bool send_ccr_init_req_gx_gy(smf_sess_t *sess, smf_event_t *e)
{
int use_gy = smf_use_gy_iface();
if (use_gy == -1) {
ogs_error("No Gy Diameter Peer");
/* TODO: drop Gx connection here,
* possibly move to another "releasing" state! */
uint8_t gtp_cause = (e->gtp_xact->gtp_version == 1) ?
OGS_GTP1_CAUSE_NO_RESOURCES_AVAILABLE :
OGS_GTP2_CAUSE_UE_NOT_AUTHORISED_BY_OCS_OR_EXTERNAL_AAA_SERVER;
send_gtp_create_err_msg(sess, e->gtp_xact, gtp_cause);
return false;
}
sess->sm_data.gx_ccr_init_in_flight = true;
sess->timer_gx_cca = ogs_timer_add(ogs_app()->timer_mgr,
smf_timer_gx_no_cca, e);
ogs_assert(sess->timer_gx_cca);
ogs_timer_start(sess->timer_gx_cca, ogs_app()->time.message.diameter_timeout);
smf_gx_send_ccr(sess, e->gtp_xact,
OGS_DIAM_GX_CC_REQUEST_TYPE_INITIAL_REQUEST);
if (use_gy == 1) {
/* Gy is available,
* set up session for the bearer before accepting it towards the UE */
sess->sm_data.gy_ccr_init_in_flight = true;
sess->timer_gy_cca = ogs_timer_add(ogs_app()->timer_mgr,
smf_timer_gy_no_cca, e);
ogs_assert(sess->timer_gy_cca);
ogs_timer_start(sess->timer_gy_cca, ogs_app()->time.message.diameter_timeout);
smf_gy_send_ccr(sess, e->gtp_xact,
OGS_DIAM_GY_CC_REQUEST_TYPE_INITIAL_REQUEST);
}
return true;
}
static bool send_ccr_termination_req_gx_gy_s6b(smf_sess_t *sess, smf_event_t *e)
{
/* TODO: we should take into account here whether "sess" has an active Gy
session created, not whether one was supposedly created as per policy */
int use_gy = smf_use_gy_iface();
if (use_gy == -1) {
ogs_error("No Gy Diameter Peer");
/* TODO: drop Gx connection here,
* possibly move to another "releasing" state! */
uint8_t gtp_cause = (e->gtp_xact->gtp_version == 1) ?
OGS_GTP1_CAUSE_NO_RESOURCES_AVAILABLE :
OGS_GTP2_CAUSE_UE_NOT_AUTHORISED_BY_OCS_OR_EXTERNAL_AAA_SERVER;
send_gtp_delete_err_msg(sess, e->gtp_xact, gtp_cause);
return false;
}
if (sess->gtp_rat_type == OGS_GTP2_RAT_TYPE_WLAN) {
sess->sm_data.s6b_str_in_flight = true;
smf_s6b_send_str(sess, e->gtp_xact,
OGS_DIAM_TERMINATION_CAUSE_DIAMETER_LOGOUT);
}
sess->sm_data.gx_ccr_term_in_flight = true;
sess->timer_gx_cca = ogs_timer_add(ogs_app()->timer_mgr, smf_timer_gx_no_cca, e);
ogs_assert(sess->timer_gx_cca);
ogs_timer_start(sess->timer_gx_cca, ogs_app()->time.message.diameter_timeout);
smf_gx_send_ccr(sess, e->gtp_xact,
OGS_DIAM_GX_CC_REQUEST_TYPE_TERMINATION_REQUEST);
if (use_gy == 1) {
/* Gy is available,
* set up session for the bearer before accepting it towards the UE */
sess->sm_data.gy_ccr_term_in_flight = true;
sess->timer_gy_cca = ogs_timer_add(ogs_app()->timer_mgr,
smf_timer_gy_no_cca, e);
ogs_assert(sess->timer_gy_cca);
ogs_timer_start(sess->timer_gy_cca, ogs_app()->time.message.diameter_timeout);
smf_gy_send_ccr(sess, e->gtp_xact,
OGS_DIAM_GY_CC_REQUEST_TYPE_TERMINATION_REQUEST);
}
return true;
}
static bool send_sbi_message_from_delete_trigger(
smf_sess_t *sess, ogs_sbi_stream_t *stream, int trigger)
{
ogs_sbi_message_t sendmsg;
ogs_sbi_response_t *response = NULL;
if (trigger == OGS_PFCP_DELETE_TRIGGER_LOCAL_INITIATED) {
/* Nothing */
} else if (trigger == OGS_PFCP_DELETE_TRIGGER_UE_REQUESTED) {
ogs_pkbuf_t *n1smbuf = NULL, *n2smbuf = NULL;
n1smbuf = gsm_build_pdu_session_release_command(
sess, OGS_5GSM_CAUSE_REGULAR_DEACTIVATION);
ogs_assert(n1smbuf);
n2smbuf = ngap_build_pdu_session_resource_release_command_transfer(
sess, SMF_NGAP_STATE_DELETE_TRIGGER_UE_REQUESTED,
NGAP_Cause_PR_nas, NGAP_CauseNas_normal_release);
ogs_assert(n2smbuf);
ogs_assert(stream);
smf_sbi_send_sm_context_updated_data_n1_n2_message(sess, stream,
n1smbuf, OpenAPI_n2_sm_info_type_PDU_RES_REL_CMD, n2smbuf);
} else if (trigger == OGS_PFCP_DELETE_TRIGGER_AMF_UPDATE_SM_CONTEXT ||
trigger == OGS_PFCP_DELETE_TRIGGER_AMF_RELEASE_SM_CONTEXT) {
memset(&sendmsg, 0, sizeof(sendmsg));
response = ogs_sbi_build_response(
&sendmsg, OGS_SBI_HTTP_STATUS_NO_CONTENT);
ogs_assert(response);
ogs_assert(stream);
ogs_assert(true == ogs_sbi_server_send_response(stream, response));
} else if (trigger == OGS_PFCP_DELETE_TRIGGER_PCF_INITIATED) {
smf_n1_n2_message_transfer_param_t param;
memset(¶m, 0, sizeof(param));
param.state = SMF_NETWORK_REQUESTED_PDU_SESSION_RELEASE;
param.n2smbuf =
ngap_build_pdu_session_resource_release_command_transfer(
sess, SMF_NGAP_STATE_DELETE_TRIGGER_PCF_INITIATED,
NGAP_Cause_PR_nas, NGAP_CauseNas_normal_release);
ogs_assert(param.n2smbuf);
param.skip_ind = true;
smf_namf_comm_send_n1_n2_message_transfer(sess, ¶m);
} else {
ogs_fatal("Unknown trigger [%d]", trigger);
ogs_assert_if_reached();
}
return true;
}
void smf_gsm_state_initial(ogs_fsm_t *s, smf_event_t *e)
{
int rv;
char *strerror = NULL;
smf_ue_t *smf_ue = NULL;
smf_sess_t *sess = NULL;
ogs_gtp1_message_t *gtp1_message = NULL;
ogs_gtp2_message_t *gtp2_message = NULL;
uint8_t gtp1_cause, gtp2_cause;
ogs_nas_5gs_message_t *nas_message = NULL;
ogs_sbi_stream_t *stream = NULL;
ogs_sbi_message_t *sbi_message = NULL;
ogs_assert(s);
ogs_assert(e);
smf_sm_debug(e);
sess = e->sess;
ogs_assert(sess);
switch (e->h.id) {
case OGS_FSM_ENTRY_SIG:
/* reset state: */
sess->sm_data.gx_ccr_init_in_flight = false;
sess->sm_data.gy_ccr_init_in_flight = false;
sess->sm_data.gx_cca_init_err = ER_DIAMETER_SUCCESS;
sess->sm_data.gy_cca_init_err = ER_DIAMETER_SUCCESS;
break;
case OGS_FSM_EXIT_SIG:
break;
case SMF_EVT_GN_MESSAGE:
gtp1_message = e->gtp1_message;
ogs_assert(gtp1_message);
switch(gtp1_message->h.type) {
case OGS_GTP1_CREATE_PDP_CONTEXT_REQUEST_TYPE:
gtp1_cause = smf_gn_handle_create_pdp_context_request(sess,
e->gtp_xact,
&e->gtp1_message->create_pdp_context_request);
if (gtp1_cause != OGS_GTP1_CAUSE_REQUEST_ACCEPTED) {
send_gtp_create_err_msg(sess, e->gtp_xact, gtp1_cause);
return;
}
if (send_ccr_init_req_gx_gy(sess, e) == true)
OGS_FSM_TRAN(s, smf_gsm_state_wait_epc_auth_initial);
}
break;
case SMF_EVT_S5C_MESSAGE:
gtp2_message = e->gtp2_message;
ogs_assert(gtp2_message);
switch(gtp2_message->h.type) {
case OGS_GTP2_CREATE_SESSION_REQUEST_TYPE:
gtp2_cause = smf_s5c_handle_create_session_request(sess,
e->gtp_xact,
&e->gtp2_message->create_session_request);
if (gtp2_cause != OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
send_gtp_create_err_msg(sess, e->gtp_xact, gtp2_cause);
return;
}
switch (sess->gtp_rat_type) {
case OGS_GTP2_RAT_TYPE_EUTRAN:
if (send_ccr_init_req_gx_gy(sess, e) == true)
OGS_FSM_TRAN(s, smf_gsm_state_wait_epc_auth_initial);
break;
case OGS_GTP2_RAT_TYPE_WLAN:
sess->timer_gx_cca = ogs_timer_add(ogs_app()->timer_mgr,
smf_timer_gx_no_cca, e);
ogs_assert(sess->timer_gx_cca);
ogs_timer_start(sess->timer_gx_cca, ogs_app()->time.message.diameter_timeout);
smf_s6b_send_aar(sess, e->gtp_xact);
OGS_FSM_TRAN(s, smf_gsm_state_wait_epc_auth_initial);
break;
default:
ogs_error("Unknown RAT Type [%d]", sess->gtp_rat_type);
ogs_assert_if_reached();
}
break;
default:
ogs_error("Not implemented(type:%d)", gtp2_message->h.type);
}
break;
case OGS_EVENT_SBI_SERVER:
sbi_message = e->h.sbi.message;
ogs_assert(sbi_message);
stream = e->h.sbi.data;
ogs_assert(stream);
SWITCH(sbi_message->h.service.name)
CASE(OGS_SBI_SERVICE_NAME_NSMF_PDUSESSION)
SWITCH(sbi_message->h.resource.component[2])
CASE(OGS_SBI_RESOURCE_NAME_MODIFY)
CASE(OGS_SBI_RESOURCE_NAME_RELEASE)
ogs_error("Invalid resource name [%s]",
sbi_message->h.resource.component[2]);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_BAD_REQUEST, sbi_message,
"Invalid resource name [%s]",
sbi_message->h.resource.component[2]));
OGS_FSM_TRAN(s, smf_gsm_state_exception);
break;
DEFAULT
if (smf_nsmf_handle_create_sm_context(
sess, stream, sbi_message) == false) {
ogs_error("smf_nsmf_handle_create_sm_context() failed");
OGS_FSM_TRAN(s, smf_gsm_state_exception);
}
END
break;
DEFAULT
ogs_error("Invalid API name [%s]", sbi_message->h.service.name);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_BAD_REQUEST, sbi_message,
"Invalid API name", sbi_message->h.service.name));
OGS_FSM_TRAN(s, smf_gsm_state_exception);
END
break;
case SMF_EVT_5GSM_MESSAGE:
nas_message = e->nas.message;
ogs_assert(nas_message);
sess = e->sess;
ogs_assert(sess);
stream = e->h.sbi.data;
ogs_assert(stream);
smf_ue = sess->smf_ue;
ogs_assert(smf_ue);
switch (nas_message->gsm.h.message_type) {
case OGS_NAS_5GS_PDU_SESSION_ESTABLISHMENT_REQUEST:
rv = gsm_handle_pdu_session_establishment_request(sess, stream,
&nas_message->gsm.pdu_session_establishment_request);
if (rv != OGS_OK) {
ogs_error("[%s:%d] Cannot handle NAS message",
smf_ue->supi, sess->psi);
OGS_FSM_TRAN(s, smf_gsm_state_exception);
break;
}
OGS_FSM_TRAN(s, smf_gsm_state_wait_5gc_sm_policy_association);
break;
default:
strerror = ogs_msprintf("Unknown message [%d]",
nas_message->gsm.h.message_type);
ogs_assert(strerror);
ogs_error("%s", strerror);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_BAD_REQUEST, NULL, strerror, NULL));
ogs_free(strerror);
OGS_FSM_TRAN(s, smf_gsm_state_exception);
}
break;
default:
ogs_error("No handler for event %s", smf_event_get_name(e));
break;
}
}
void smf_gsm_state_wait_epc_auth_initial(ogs_fsm_t *s, smf_event_t *e)
{
smf_sess_t *sess = NULL;
ogs_diam_gy_message_t *gy_message = NULL;
ogs_diam_gx_message_t *gx_message = NULL;
uint32_t diam_err;
ogs_assert(s);
ogs_assert(e);
smf_sm_debug(e);
sess = e->sess;
ogs_assert(sess);
switch (e->h.id) {
case SMF_EVT_GX_MESSAGE:
gx_message = e->gx_message;
ogs_assert(gx_message);
switch(gx_message->cmd_code) {
case OGS_DIAM_GX_CMD_CODE_CREDIT_CONTROL:
switch(gx_message->cc_request_type) {
case OGS_DIAM_GX_CC_REQUEST_TYPE_INITIAL_REQUEST:
ogs_assert(e->gtp_xact);
diam_err = smf_gx_handle_cca_initial_request(sess,
gx_message, e->gtp_xact);
sess->sm_data.gx_ccr_init_in_flight = false;
ogs_timer_stop(sess->timer_gx_cca);
ogs_timer_delete(sess->timer_gx_cca);
sess->timer_gx_cca = NULL;
sess->sm_data.gx_cca_init_err = diam_err;
goto test_can_proceed;
}
break;
}
break;
case SMF_EVT_GY_MESSAGE:
gy_message = e->gy_message;
ogs_assert(gy_message);
switch(gy_message->cmd_code) {
case OGS_DIAM_GY_CMD_CODE_CREDIT_CONTROL:
switch(gy_message->cc_request_type) {
case OGS_DIAM_GY_CC_REQUEST_TYPE_INITIAL_REQUEST:
ogs_assert(e->gtp_xact);
diam_err = smf_gy_handle_cca_initial_request(sess,
gy_message, e->gtp_xact);
sess->sm_data.gy_ccr_init_in_flight = false;
ogs_timer_stop(sess->timer_gy_cca);
ogs_timer_delete(sess->timer_gy_cca);
sess->timer_gy_cca = NULL;
sess->sm_data.gy_cca_init_err = diam_err;
goto test_can_proceed;
}
break;
}
break;
case SMF_EVT_DIAMETER_TIMER:
switch(e->h.timer_id) {
case SMF_TIMER_GX_CCA:
ogs_error("Gx timeout waiting for CCA Init");
sess->sm_data.gx_ccr_init_in_flight = false;
ogs_timer_stop(sess->timer_gx_cca);
ogs_timer_delete(sess->timer_gx_cca);
sess->timer_gx_cca = NULL;
sess->sm_data.gx_cca_init_err = ER_DIAMETER_UNABLE_TO_DELIVER;
goto test_can_proceed;
case SMF_TIMER_GY_CCA:
ogs_error("Gy timeout waiting for CCA Init");
sess->sm_data.gy_ccr_init_in_flight = false;
ogs_timer_stop(sess->timer_gy_cca);
ogs_timer_delete(sess->timer_gy_cca);
sess->timer_gy_cca = NULL;
sess->sm_data.gy_cca_init_err = ER_DIAMETER_UNABLE_TO_DELIVER;
goto test_can_proceed;
}
break;
}
return;
test_can_proceed:
/* First wait for both Gx and Gy requests to be done: */
if (!sess->sm_data.gx_ccr_init_in_flight &&
!sess->sm_data.gy_ccr_init_in_flight) {
diam_err = ER_DIAMETER_SUCCESS;
if (sess->sm_data.gx_cca_init_err != ER_DIAMETER_SUCCESS)
diam_err = sess->sm_data.gx_cca_init_err;
if (sess->sm_data.gy_cca_init_err != ER_DIAMETER_SUCCESS)
diam_err = sess->sm_data.gy_cca_init_err;
if (diam_err == ER_DIAMETER_SUCCESS) {
OGS_FSM_TRAN(s, &smf_gsm_state_wait_pfcp_establishment);
ogs_assert(OGS_OK ==
smf_epc_pfcp_send_session_establishment_request(
sess, e->gtp_xact));
} else {
/* FIXME: tear down Gx/Gy session
* if its sm_data.*init_err == ER_DIAMETER_SUCCESS */
uint8_t gtp_cause = gtp_cause_from_diameter(
e->gtp_xact->gtp_version, diam_err, NULL);
send_gtp_create_err_msg(sess, e->gtp_xact, gtp_cause);
}
}
}
void smf_gsm_state_wait_5gc_sm_policy_association(ogs_fsm_t *s, smf_event_t *e)
{
char *strerror = NULL;
smf_ue_t *smf_ue = NULL;
smf_sess_t *sess = NULL;
ogs_sbi_stream_t *stream = NULL;
ogs_sbi_message_t *sbi_message = NULL;
int state = 0;
ogs_assert(s);
ogs_assert(e);
smf_sm_debug(e);
sess = e->sess;
ogs_assert(sess);
switch (e->h.id) {
case OGS_FSM_ENTRY_SIG:
break;
case OGS_FSM_EXIT_SIG:
break;
case OGS_EVENT_SBI_CLIENT:
sbi_message = e->h.sbi.message;
ogs_assert(sbi_message);
sess = e->sess;
ogs_assert(sess);
smf_ue = sess->smf_ue;
ogs_assert(smf_ue);
SWITCH(sbi_message->h.service.name)
CASE(OGS_SBI_SERVICE_NAME_NUDM_SDM)
stream = e->h.sbi.data;
ogs_assert(stream);
SWITCH(sbi_message->h.resource.component[1])
CASE(OGS_SBI_RESOURCE_NAME_SM_DATA)
if (sbi_message->res_status != OGS_SBI_HTTP_STATUS_OK) {
strerror = ogs_msprintf("[%s:%d] HTTP response error [%d]",
smf_ue->supi, sess->psi, sbi_message->res_status);
ogs_assert(strerror);
ogs_error("%s", strerror);
ogs_assert(true ==
ogs_sbi_server_send_error(
stream, sbi_message->res_status,
sbi_message, strerror, NULL));
ogs_free(strerror);
OGS_FSM_TRAN(s, smf_gsm_state_exception);
break;
}
if (smf_nudm_sdm_handle_get(
sess, stream, sbi_message) == false) {
ogs_error("smf_nudm_sdm_handle_get() failed");
OGS_FSM_TRAN(s, smf_gsm_state_exception);
}
break;
DEFAULT
strerror = ogs_msprintf("[%s:%d] Invalid resource name [%s]",
smf_ue->supi, sess->psi,
sbi_message->h.resource.component[1]);
ogs_assert(strerror);
ogs_error("%s", strerror);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_BAD_REQUEST,
sbi_message, strerror, NULL));
ogs_free(strerror);
OGS_FSM_TRAN(s, smf_gsm_state_exception);
END
break;
CASE(OGS_SBI_SERVICE_NAME_NPCF_SMPOLICYCONTROL)
stream = e->h.sbi.data;
state = e->h.sbi.state;
SWITCH(sbi_message->h.resource.component[0])
CASE(OGS_SBI_RESOURCE_NAME_SM_POLICIES)
if (sbi_message->h.resource.component[1]) {
strerror = ogs_msprintf("[%s:%d] "
"Unknown resource name [%s]",
smf_ue->supi, sess->psi,
sbi_message->h.resource.component[1]);
ogs_assert(strerror);
ogs_error("%s", strerror);
if (stream)
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_BAD_REQUEST,
sbi_message, strerror, NULL));
ogs_free(strerror);
OGS_FSM_TRAN(s, smf_gsm_state_exception);
} else {
ogs_assert(stream);
if (sbi_message->res_status !=
OGS_SBI_HTTP_STATUS_CREATED) {
strerror = ogs_msprintf(
"[%s:%d] HTTP response error [%d]",
smf_ue->supi, sess->psi,
sbi_message->res_status);
ogs_assert(strerror);
ogs_error("%s", strerror);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
sbi_message->res_status,
sbi_message, strerror, NULL));
ogs_free(strerror);
OGS_FSM_TRAN(s, smf_gsm_state_exception);
break;
}
if (smf_npcf_smpolicycontrol_handle_create(
sess, stream, state, sbi_message) == true) {
OGS_FSM_TRAN(s,
&smf_gsm_state_wait_pfcp_establishment);
} else {
ogs_error(
"smf_npcf_smpolicycontrol_handle_create() failed");
OGS_FSM_TRAN(s, smf_gsm_state_exception);
}
}
break;
DEFAULT
strerror = ogs_msprintf("[%s:%d] Invalid resource name [%s]",
smf_ue->supi, sess->psi,
sbi_message->h.resource.component[0]);
ogs_assert(strerror);
ogs_error("%s", strerror);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_BAD_REQUEST,
sbi_message, strerror, NULL));
ogs_free(strerror);
OGS_FSM_TRAN(s, smf_gsm_state_exception);
END
break;
DEFAULT
ogs_error("[%s:%d] Invalid API name [%s]",
smf_ue->supi, sess->psi, sbi_message->h.service.name);
ogs_assert_if_reached();
END
break;
default:
ogs_error("No handler for event %s", smf_event_get_name(e));
break;
}
}
void smf_gsm_state_wait_pfcp_establishment(ogs_fsm_t *s, smf_event_t *e)
{
smf_sess_t *sess = NULL;
uint8_t pfcp_cause, gtp_cause;
smf_n1_n2_message_transfer_param_t param;
ogs_pfcp_xact_t *pfcp_xact = NULL;
ogs_pfcp_message_t *pfcp_message = NULL;
int rv;
ogs_gtp_xact_t *gtp_xact = NULL;
ogs_assert(s);
ogs_assert(e);
smf_sm_debug(e);
sess = e->sess;
ogs_assert(sess);
switch (e->h.id) {
case SMF_EVT_N4_MESSAGE:
pfcp_xact = e->pfcp_xact;
ogs_assert(pfcp_xact);
pfcp_message = e->pfcp_message;
ogs_assert(pfcp_message);
switch (pfcp_message->h.type) {
case OGS_PFCP_SESSION_ESTABLISHMENT_RESPONSE_TYPE:
if (pfcp_xact->epc) {
ogs_gtp_xact_t *gtp_xact = pfcp_xact->assoc_xact;
ogs_assert(gtp_xact);
pfcp_cause = smf_epc_n4_handle_session_establishment_response(
sess, pfcp_xact,
&pfcp_message->pfcp_session_establishment_response);
if (pfcp_cause != OGS_PFCP_CAUSE_REQUEST_ACCEPTED) {
/* FIXME: tear down Gy and Gx */
gtp_cause = gtp_cause_from_pfcp(
pfcp_cause, gtp_xact->gtp_version);
send_gtp_create_err_msg(sess, e->gtp_xact, gtp_cause);
return;
}
switch (gtp_xact->gtp_version) {
case 1:
rv = smf_gtp1_send_create_pdp_context_response(sess, gtp_xact);
break;
case 2:
rv = smf_gtp2_send_create_session_response(sess, gtp_xact);
break;
default:
rv = OGS_ERROR;
break;
}
/* If no CreatePDPCtxResp can be sent, then tear down the session: */
if (rv != OGS_OK) {
OGS_FSM_TRAN(s, &smf_gsm_state_wait_pfcp_deletion);
return;
}
if (sess->gtp_rat_type == OGS_GTP2_RAT_TYPE_WLAN) {
/*
* TS23.214
* 6.3.1.7 Procedures with modification of bearer
* p50
* 2. ...
* For "PGW/MME initiated bearer deactivation procedure",
* PGW-C shall indicate PGW-U to stop counting and stop
* forwarding downlink packets for the affected bearer(s).
*/
ogs_assert(OGS_OK ==
smf_epc_pfcp_send_deactivation(sess,
OGS_GTP2_CAUSE_RAT_CHANGED_FROM_3GPP_TO_NON_3GPP));
}
smf_bearer_binding(sess);
} else {
pfcp_cause = smf_5gc_n4_handle_session_establishment_response(
sess, pfcp_xact,
&pfcp_message->pfcp_session_establishment_response);
if (pfcp_cause != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
return;
memset(¶m, 0, sizeof(param));
param.state = SMF_UE_REQUESTED_PDU_SESSION_ESTABLISHMENT;
param.n1smbuf =
gsm_build_pdu_session_establishment_accept(sess);
ogs_assert(param.n1smbuf);
param.n2smbuf =
ngap_build_pdu_session_resource_setup_request_transfer(
sess);
ogs_assert(param.n2smbuf);
smf_namf_comm_send_n1_n2_message_transfer(sess, ¶m);
}
OGS_FSM_TRAN(s, &smf_gsm_state_operational);
break;
default:
ogs_error("cannot handle PFCP message type[%d]",
pfcp_message->h.type);
}
break;
case SMF_EVT_PFCP_TIMEOUT:
switch(e->h.timer_id) {
case SMF_TIMEOUT_PFCP_SER:
ogs_error("PFCP timeout waiting for Session Establishment Response");
gtp_xact = (ogs_gtp_xact_t *) sess->timeout_xact->assoc_xact;
switch (gtp_xact->gtp_version) {
case 1:
gtp_cause = OGS_GTP1_CAUSE_NETWORK_FAILURE;
break;
case 2:
gtp_cause = OGS_GTP2_CAUSE_REMOTE_PEER_NOT_RESPONDING;
break;
}
send_gtp_create_err_msg(sess, gtp_xact, gtp_cause);
break;
default:
ogs_error("Unknown SMF_EVT_PFCP_TIMEOUT timer id [%d]", e->h.timer_id);
}
}
}
void smf_gsm_state_operational(ogs_fsm_t *s, smf_event_t *e)
{
int rv, ngap_state;
char *strerror = NULL;
smf_ue_t *smf_ue = NULL;
smf_sess_t *sess = NULL;
ogs_pkbuf_t *pkbuf = NULL;
ogs_pfcp_xact_t *pfcp_xact = NULL;
ogs_pfcp_message_t *pfcp_message = NULL;
ogs_nas_5gs_message_t *nas_message = NULL;
ogs_sbi_stream_t *stream = NULL;
ogs_sbi_message_t *sbi_message = NULL;
ogs_gtp1_message_t *gtp1_message = NULL;
ogs_gtp2_message_t *gtp2_message = NULL;
uint8_t gtp1_cause, gtp2_cause;
bool release;
ogs_assert(s);
ogs_assert(e);
smf_sm_debug(e);
sess = e->sess;
ogs_assert(sess);
switch (e->h.id) {
case OGS_FSM_ENTRY_SIG:
sess->pfcp_established = true;
break;
case OGS_FSM_EXIT_SIG:
sess->pfcp_established = false;
break;
case SMF_EVT_GN_MESSAGE:
gtp1_message = e->gtp1_message;
ogs_assert(gtp1_message);
switch(gtp1_message->h.type) {
case OGS_GTP1_DELETE_PDP_CONTEXT_REQUEST_TYPE:
gtp1_cause = smf_gn_handle_delete_pdp_context_request(sess,
e->gtp_xact,
>p1_message->delete_pdp_context_request);
if (gtp1_cause != OGS_GTP1_CAUSE_REQUEST_ACCEPTED) {
ogs_gtp1_send_error_message(e->gtp_xact, sess->sgw_s5c_teid,
OGS_GTP1_DELETE_PDP_CONTEXT_RESPONSE_TYPE, gtp1_cause);
return;
}
OGS_FSM_TRAN(s, &smf_gsm_state_wait_pfcp_deletion);
}
break;
case SMF_EVT_S5C_MESSAGE:
gtp2_message = e->gtp2_message;
ogs_assert(gtp2_message);
switch(gtp2_message->h.type) {
case OGS_GTP2_DELETE_SESSION_REQUEST_TYPE:
gtp2_cause = smf_s5c_handle_delete_session_request(
sess, e->gtp_xact,
>p2_message->delete_session_request);
if (gtp2_cause != OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
ogs_gtp2_send_error_message(e->gtp_xact, sess->sgw_s5c_teid,
OGS_GTP2_DELETE_SESSION_RESPONSE_TYPE, gtp2_cause);
return;
}
OGS_FSM_TRAN(s, &smf_gsm_state_wait_pfcp_deletion);
break;
case OGS_GTP2_DELETE_BEARER_RESPONSE_TYPE:
release = smf_s5c_handle_delete_bearer_response(
sess, e->gtp_xact, &e->gtp2_message->delete_bearer_response);
if (release) {
e->gtp_xact = NULL;
OGS_FSM_TRAN(s, &smf_gsm_state_wait_pfcp_deletion);
}
break;
case OGS_GTP2_CREATE_SESSION_REQUEST_TYPE:
ogs_warn("received Create Session Request for preexisting session");
gtp2_cause = smf_s5c_handle_create_session_request(sess,
e->gtp_xact,
&e->gtp2_message->create_session_request);
if (gtp2_cause != OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
send_gtp_create_err_msg(sess, e->gtp_xact, gtp2_cause);
return;
}
switch (sess->gtp_rat_type) {
case OGS_GTP2_RAT_TYPE_EUTRAN:
if (send_ccr_init_req_gx_gy(sess, e) == true)
OGS_FSM_TRAN(s, smf_gsm_state_wait_epc_auth_initial);
break;
case OGS_GTP2_RAT_TYPE_WLAN:
smf_s6b_send_aar(sess, e->gtp_xact);
OGS_FSM_TRAN(s, smf_gsm_state_wait_epc_auth_initial);
break;
default:
ogs_error("Unknown RAT Type [%d]", sess->gtp_rat_type);
ogs_assert_if_reached();
}
break;
default:
ogs_error("Not implemented(type:%d)", gtp2_message->h.type);
}
break;
case OGS_EVENT_SBI_SERVER:
sbi_message = e->h.sbi.message;
ogs_assert(sbi_message);
stream = e->h.sbi.data;
ogs_assert(stream);
SWITCH(sbi_message->h.service.name)
CASE(OGS_SBI_SERVICE_NAME_NSMF_PDUSESSION)
SWITCH(sbi_message->h.resource.component[2])
CASE(OGS_SBI_RESOURCE_NAME_MODIFY)
smf_nsmf_handle_update_sm_context(sess, stream, sbi_message);
break;
CASE(OGS_SBI_RESOURCE_NAME_RELEASE)
smf_nsmf_handle_release_sm_context(sess, stream, sbi_message);
break;
DEFAULT
ogs_error("Invalid resource name [%s]",
sbi_message->h.resource.component[2]);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_BAD_REQUEST, sbi_message,
"Invalid resource name [%s]",
sbi_message->h.resource.component[2]));
OGS_FSM_TRAN(s, smf_gsm_state_exception);
END
break;
DEFAULT
ogs_error("Invalid API name [%s]", sbi_message->h.service.name);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_BAD_REQUEST, sbi_message,
"Invalid API name", sbi_message->h.service.name));
OGS_FSM_TRAN(s, smf_gsm_state_exception);
END
break;
case OGS_EVENT_SBI_CLIENT:
sbi_message = e->h.sbi.message;
ogs_assert(sbi_message);
sess = e->sess;
ogs_assert(sess);
smf_ue = sess->smf_ue;
ogs_assert(smf_ue);
SWITCH(sbi_message->h.service.name)
CASE(OGS_SBI_SERVICE_NAME_NPCF_SMPOLICYCONTROL)
stream = e->h.sbi.data;
SWITCH(sbi_message->h.resource.component[0])
CASE(OGS_SBI_RESOURCE_NAME_SM_POLICIES)
if (!sbi_message->h.resource.component[1]) {
ogs_assert(stream);
strerror = ogs_msprintf(
"[%s:%d] HTTP response error [%d]",
smf_ue->supi, sess->psi,
sbi_message->res_status);
ogs_assert(strerror);
ogs_error("%s", strerror);
ogs_assert(true ==
ogs_sbi_server_send_error(
stream, sbi_message->res_status,
sbi_message, strerror, NULL));
ogs_free(strerror);
OGS_FSM_TRAN(s, smf_gsm_state_exception);
break;
} else {
SWITCH(sbi_message->h.resource.component[2])
CASE(OGS_SBI_RESOURCE_NAME_DELETE)
if (sbi_message->res_status !=
OGS_SBI_HTTP_STATUS_NO_CONTENT) {
strerror = ogs_msprintf(
"[%s:%d] HTTP response error [%d]",
smf_ue->supi, sess->psi,
sbi_message->res_status);
ogs_assert(strerror);
ogs_error("%s", strerror);
ogs_free(strerror);
OGS_FSM_TRAN(s, smf_gsm_state_exception);
break;