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open5gs/src/sgwc/sgwc-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 "s11-handler.h"
#include "s5c-handler.h"
#include "gtp-path.h"
#include "pfcp-path.h"
static void sgwc_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 sgwc_handle_echo_response(
ogs_gtp_xact_t *s11_xact, ogs_gtp_echo_response_t *rsp)
{
/* Not Implemented */
}
void sgwc_state_initial(ogs_fsm_t *s, sgwc_event_t *e)
{
sgwc_sm_debug(e);
ogs_assert(s);
OGS_FSM_TRAN(s, &sgwc_state_operational);
}
void sgwc_state_final(ogs_fsm_t *s, sgwc_event_t *e)
{
sgwc_sm_debug(e);
ogs_assert(s);
}
void sgwc_state_operational(ogs_fsm_t *s, sgwc_event_t *e)
{
int rv;
ogs_pkbuf_t *recvbuf = NULL;
sgwc_ue_t *sgwc_ue = NULL;
sgwc_sess_t *sess = NULL;
ogs_gtp_xact_t *gtp_xact = NULL;
ogs_gtp_message_t gtp_message;
ogs_gtp_node_t *gnode = NULL;
ogs_pfcp_node_t *pfcp_node = NULL;
ogs_pfcp_xact_t *pfcp_xact = NULL;
ogs_pfcp_message_t pfcp_message;
sgwc_sm_debug(e);
ogs_assert(s);
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
break;
case OGS_FSM_EXIT_SIG:
break;
case SGWC_EVT_SXA_MESSAGE:
ogs_assert(e);
recvbuf = e->pkbuf;
ogs_assert(recvbuf);
pfcp_node = e->pfcp_node;
ogs_assert(pfcp_node);
ogs_assert(OGS_FSM_STATE(&pfcp_node->sm));
if (ogs_pfcp_parse_msg(&pfcp_message, recvbuf) != OGS_OK) {
ogs_error("ogs_pfcp_parse_msg() failed");
ogs_pkbuf_free(recvbuf);
break;
}
rv = ogs_pfcp_xact_receive(pfcp_node, &pfcp_message.h, &pfcp_xact);
if (rv != OGS_OK) {
ogs_pkbuf_free(recvbuf);
break;
}
e->pfcp_message = &pfcp_message;
e->pfcp_xact = pfcp_xact;
e->gtp_message = NULL;
if (pfcp_xact->gtpbuf) {
rv = ogs_gtp_parse_msg(&gtp_message, pfcp_xact->gtpbuf);
ogs_pkbuf_free(pfcp_xact->gtpbuf);
e->gtp_message = &gtp_message;
}
ogs_fsm_dispatch(&pfcp_node->sm, e);
if (OGS_FSM_CHECK(&pfcp_node->sm, sgwc_pfcp_state_exception)) {
ogs_error("PFCP state machine exception");
}
ogs_pkbuf_free(recvbuf);
break;
case SGWC_EVT_SXA_TIMER:
case SGWC_EVT_SXA_NO_HEARTBEAT:
ogs_assert(e);
pfcp_node = e->pfcp_node;
ogs_assert(pfcp_node);
ogs_assert(OGS_FSM_STATE(&pfcp_node->sm));
ogs_fsm_dispatch(&pfcp_node->sm, e);
break;
case SGWC_EVT_S11_MESSAGE:
ogs_assert(e);
recvbuf = e->pkbuf;
ogs_assert(recvbuf);
if (ogs_gtp_parse_msg(&gtp_message, recvbuf) != OGS_OK) {
ogs_error("ogs_gtp_parse_msg() failed");
ogs_pkbuf_free(recvbuf);
break;
}
if (gtp_message.h.teid_presence && gtp_message.h.teid != 0) {
/* Cause is not "Context not found" */
sgwc_ue = sgwc_ue_find_by_teid(gtp_message.h.teid);
}
if (sgwc_ue) {
gnode = sgwc_ue->gnode;
ogs_assert(gnode);
} else {
gnode = e->gnode;
ogs_assert(gnode);
}
rv = ogs_gtp_xact_receive(gnode, &gtp_message.h, &gtp_xact);
if (rv != OGS_OK) {
ogs_pkbuf_free(recvbuf);
break;
}
switch(gtp_message.h.type) {
case OGS_GTP_ECHO_REQUEST_TYPE:
sgwc_handle_echo_request(gtp_xact, &gtp_message.echo_request);
break;
case OGS_GTP_ECHO_RESPONSE_TYPE:
sgwc_handle_echo_response(gtp_xact, &gtp_message.echo_response);
break;
case OGS_GTP_CREATE_SESSION_REQUEST_TYPE:
if (gtp_message.h.teid == 0) {
ogs_expect(!sgwc_ue);
sgwc_ue = sgwc_ue_add_by_message(&gtp_message);
if (sgwc_ue)
OGS_SETUP_GTP_NODE(sgwc_ue, gnode);
}
sgwc_s11_handle_create_session_request(
sgwc_ue, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_MODIFY_BEARER_REQUEST_TYPE:
sgwc_s11_handle_modify_bearer_request(
sgwc_ue, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_DELETE_SESSION_REQUEST_TYPE:
sgwc_s11_handle_delete_session_request(
sgwc_ue, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_CREATE_BEARER_RESPONSE_TYPE:
sgwc_s11_handle_create_bearer_response(
sgwc_ue, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_UPDATE_BEARER_RESPONSE_TYPE:
sgwc_s11_handle_update_bearer_response(
sgwc_ue, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_DELETE_BEARER_RESPONSE_TYPE:
sgwc_s11_handle_delete_bearer_response(
sgwc_ue, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_RELEASE_ACCESS_BEARERS_REQUEST_TYPE:
sgwc_s11_handle_release_access_bearers_request(
sgwc_ue, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_DOWNLINK_DATA_NOTIFICATION_ACKNOWLEDGE_TYPE:
sgwc_s11_handle_downlink_data_notification_ack(
sgwc_ue, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_CREATE_INDIRECT_DATA_FORWARDING_TUNNEL_REQUEST_TYPE:
sgwc_s11_handle_create_indirect_data_forwarding_tunnel_request(
sgwc_ue, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_DELETE_INDIRECT_DATA_FORWARDING_TUNNEL_REQUEST_TYPE:
sgwc_s11_handle_delete_indirect_data_forwarding_tunnel_request(
sgwc_ue, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_BEARER_RESOURCE_COMMAND_TYPE:
sgwc_s11_handle_bearer_resource_command(
sgwc_ue, gtp_xact, recvbuf, &gtp_message);
break;
default:
ogs_warn("Not implemented(type:%d)", gtp_message.h.type);
break;
}
ogs_pkbuf_free(recvbuf);
break;
case SGWC_EVT_S5C_MESSAGE:
ogs_assert(e);
recvbuf = e->pkbuf;
ogs_assert(recvbuf);
if (ogs_gtp_parse_msg(&gtp_message, recvbuf) != OGS_OK) {
ogs_error("ogs_gtp_parse_msg() failed");
ogs_pkbuf_free(recvbuf);
break;
}
if (gtp_message.h.teid_presence && gtp_message.h.teid != 0) {
sess = sgwc_sess_find_by_teid(gtp_message.h.teid);
}
if (sess) {
gnode = sess->gnode;
ogs_assert(gnode);
} else {
gnode = e->gnode;
ogs_assert(gnode);
}
rv = ogs_gtp_xact_receive(gnode, &gtp_message.h, &gtp_xact);
if (rv != OGS_OK) {
ogs_pkbuf_free(recvbuf);
break;
}
switch(gtp_message.h.type) {
case OGS_GTP_ECHO_REQUEST_TYPE:
sgwc_handle_echo_request(gtp_xact, &gtp_message.echo_request);
break;
case OGS_GTP_ECHO_RESPONSE_TYPE:
sgwc_handle_echo_response(gtp_xact, &gtp_message.echo_response);
break;
case OGS_GTP_CREATE_SESSION_RESPONSE_TYPE:
sgwc_s5c_handle_create_session_response(
sess, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_DELETE_SESSION_RESPONSE_TYPE:
sgwc_s5c_handle_delete_session_response(
sess, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_MODIFY_BEARER_RESPONSE_TYPE:
sgwc_s5c_handle_modify_bearer_response(
sess, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_CREATE_BEARER_REQUEST_TYPE:
sgwc_s5c_handle_create_bearer_request(
sess, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_UPDATE_BEARER_REQUEST_TYPE:
sgwc_s5c_handle_update_bearer_request(
sess, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_DELETE_BEARER_REQUEST_TYPE:
sgwc_s5c_handle_delete_bearer_request(
sess, gtp_xact, recvbuf, &gtp_message);
break;
case OGS_GTP_BEARER_RESOURCE_FAILURE_INDICATION_TYPE:
sgwc_s5c_handle_bearer_resource_failure_indication(
sess, gtp_xact, recvbuf, &gtp_message);
break;
default:
ogs_warn("Not implmeneted(type:%d)", gtp_message.h.type);
break;
}
ogs_pkbuf_free(recvbuf);
break;
default:
ogs_error("No handler for event %s", sgwc_event_get_name(e));
break;
}
}
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