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open5gs/src/sgw/sgw-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 "sgw-context.h"
#include "sgw-event.h"
#include "sgw-sm.h"
#include "sgw-gtp-path.h"
#include "sgw-s11-handler.h"
#include "sgw-s5c-handler.h"
static void sgw_handle_echo_request(
ogs_gtp_xact_t *xact, ogs_gtp_echo_request_t *req)
{
ogs_assert(xact);
ogs_assert(req);
ogs_debug("[SGW] Receiving Echo Request");
/* FIXME : Before implementing recovery counter correctly,
* I'll re-use the recovery value in request message */
ogs_gtp_send_echo_response(xact, req->recovery.u8, 0);
}
static void sgw_handle_echo_response(
ogs_gtp_xact_t *s11_xact, ogs_gtp_echo_response_t *rsp)
{
/* Not Implemented */
}
void sgw_state_initial(ogs_fsm_t *s, sgw_event_t *e)
{
sgw_sm_debug(e);
ogs_assert(s);
OGS_FSM_TRAN(s, &sgw_state_operational);
}
void sgw_state_final(ogs_fsm_t *s, sgw_event_t *e)
{
sgw_sm_debug(e);
ogs_assert(s);
}
void sgw_state_operational(ogs_fsm_t *s, sgw_event_t *e)
{
int rv;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp_xact_t *xact = NULL;
ogs_gtp_message_t message;
sgw_ue_t *sgw_ue = NULL;
sgw_sess_t *sess = NULL;
sgw_bearer_t *bearer = NULL;
ogs_gtp_node_t *gnode = NULL;
sgw_sm_debug(e);
ogs_assert(s);
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
rv = sgw_gtp_open();
if (rv != OGS_OK) {
ogs_error("Can't establish SGW path");
break;
}
break;
case OGS_FSM_EXIT_SIG:
sgw_gtp_close();
break;
case SGW_EVT_S11_MESSAGE:
ogs_assert(e);
pkbuf = e->pkbuf;
ogs_assert(pkbuf);
rv = ogs_gtp_parse_msg(&message, pkbuf);
ogs_assert(rv == OGS_OK);
if (message.h.teid_presence && message.h.teid != 0) {
/* Cause is not "Context not found" */
sgw_ue = sgw_ue_find_by_teid(message.h.teid);
}
if (sgw_ue) {
gnode = sgw_ue->gnode;
ogs_assert(gnode);
} else {
gnode = e->gnode;
ogs_assert(gnode);
}
rv = ogs_gtp_xact_receive(gnode, &message.h, &xact);
if (rv != OGS_OK) {
ogs_pkbuf_free(pkbuf);
break;
}
switch(message.h.type) {
case OGS_GTP_ECHO_REQUEST_TYPE:
sgw_handle_echo_request(xact, &message.echo_request);
break;
case OGS_GTP_ECHO_RESPONSE_TYPE:
sgw_handle_echo_response(xact, &message.echo_response);
break;
case OGS_GTP_CREATE_SESSION_REQUEST_TYPE:
if (message.h.teid == 0) {
ogs_assert(!sgw_ue);
sgw_ue = sgw_ue_add_by_message(&message);
if (sgw_ue)
OGS_SETUP_GTP_NODE(sgw_ue, gnode);
}
sgw_s11_handle_create_session_request(xact, sgw_ue,
&message);
break;
case OGS_GTP_MODIFY_BEARER_REQUEST_TYPE:
sgw_s11_handle_modify_bearer_request(xact, sgw_ue,
&message.modify_bearer_request);
break;
case OGS_GTP_DELETE_SESSION_REQUEST_TYPE:
sgw_s11_handle_delete_session_request(xact, sgw_ue,
&message);
break;
case OGS_GTP_CREATE_BEARER_RESPONSE_TYPE:
sgw_s11_handle_create_bearer_response(xact, sgw_ue,
&message);
break;
case OGS_GTP_UPDATE_BEARER_RESPONSE_TYPE:
sgw_s11_handle_update_bearer_response(xact, sgw_ue,
&message);
break;
case OGS_GTP_DELETE_BEARER_RESPONSE_TYPE:
sgw_s11_handle_delete_bearer_response(xact, sgw_ue,
&message);
break;
case OGS_GTP_RELEASE_ACCESS_BEARERS_REQUEST_TYPE:
sgw_s11_handle_release_access_bearers_request(xact, sgw_ue,
&message.release_access_bearers_request);
break;
case OGS_GTP_DOWNLINK_DATA_NOTIFICATION_ACKNOWLEDGE_TYPE:
sgw_s11_handle_downlink_data_notification_ack(xact, sgw_ue,
&message.downlink_data_notification_acknowledge);
break;
case OGS_GTP_CREATE_INDIRECT_DATA_FORWARDING_TUNNEL_REQUEST_TYPE:
sgw_s11_handle_create_indirect_data_forwarding_tunnel_request(
xact, sgw_ue,
&message.create_indirect_data_forwarding_tunnel_request);
break;
case OGS_GTP_DELETE_INDIRECT_DATA_FORWARDING_TUNNEL_REQUEST_TYPE:
sgw_s11_handle_delete_indirect_data_forwarding_tunnel_request(
xact, sgw_ue);
break;
case OGS_GTP_BEARER_RESOURCE_COMMAND_TYPE:
sgw_s11_handle_bearer_resource_command(xact, sgw_ue, &message);
break;
default:
ogs_warn("Not implemented(type:%d)", message.h.type);
break;
}
ogs_pkbuf_free(pkbuf);
break;
case SGW_EVT_S5C_MESSAGE:
ogs_assert(e);
pkbuf = e->pkbuf;
ogs_assert(pkbuf);
rv = ogs_gtp_parse_msg(&message, pkbuf);
ogs_assert(rv == OGS_OK);
if (message.h.teid_presence && message.h.teid != 0) {
sess = sgw_sess_find_by_teid(message.h.teid);
}
if (sess) {
gnode = sess->gnode;
ogs_assert(gnode);
} else {
gnode = e->gnode;
ogs_assert(gnode);
}
rv = ogs_gtp_xact_receive(gnode, &message.h, &xact);
if (rv != OGS_OK) {
ogs_pkbuf_free(pkbuf);
break;
}
switch(message.h.type) {
case OGS_GTP_ECHO_REQUEST_TYPE:
sgw_handle_echo_request(xact, &message.echo_request);
break;
case OGS_GTP_ECHO_RESPONSE_TYPE:
sgw_handle_echo_response(xact, &message.echo_response);
break;
case OGS_GTP_CREATE_SESSION_RESPONSE_TYPE:
sgw_s5c_handle_create_session_response(xact, sess,
&message);
break;
case OGS_GTP_DELETE_SESSION_RESPONSE_TYPE:
sgw_s5c_handle_delete_session_response(xact, sess,
&message);
break;
case OGS_GTP_CREATE_BEARER_REQUEST_TYPE:
sgw_s5c_handle_create_bearer_request(xact, sess,
&message);
break;
case OGS_GTP_UPDATE_BEARER_REQUEST_TYPE:
sgw_s5c_handle_update_bearer_request(xact, sess,
&message);
break;
case OGS_GTP_DELETE_BEARER_REQUEST_TYPE:
sgw_s5c_handle_delete_bearer_request(xact, sess,
&message);
break;
case OGS_GTP_BEARER_RESOURCE_FAILURE_INDICATION_TYPE:
sgw_s5c_handle_bearer_resource_failure_indication(xact, sess,
&message);
break;
default:
ogs_warn("Not implmeneted(type:%d)", message.h.type);
break;
}
ogs_pkbuf_free(pkbuf);
break;
case SGW_EVT_LO_DLDATA_NOTI:
ogs_assert(e);
bearer = e->bearer;
ogs_assert(bearer);
sgw_s11_handle_lo_dldata_notification(bearer);
break;
default:
ogs_error("No handler for event %s", sgw_event_get_name(e));
break;
}
}
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