forked from cellular-infrastructure/osmo-bsc-nat
160 lines
3.8 KiB
C
160 lines
3.8 KiB
C
/* (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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* Author: Oliver Smith <osmith@sysmocom.de>
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/lienses/>.
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*
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*/
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#include "config.h"
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#include <osmocom/core/fsm.h>
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#include <osmocom/sigtran/sccp_sap.h>
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#include <osmocom/bsc_nat/bsc_nat.h>
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#include <osmocom/bsc_nat/bssap.h>
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#include <osmocom/bsc_nat/logging.h>
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#include <osmocom/bsc_nat/msc.h>
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#define X(s) (1 << (s))
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enum msc_fsm_states {
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MSC_FSM_ST_DISCONNECTED,
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MSC_FSM_ST_CONNECTING,
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MSC_FSM_ST_CONNECTED,
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};
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enum msc_fsm_events {
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MSC_FSM_EV_TX_RESET,
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MSC_FSM_EV_RX_RESET_ACK,
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MSC_FSM_EV_DISCONNECT
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};
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static void st_connecting(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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switch (event) {
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case MSC_FSM_EV_RX_RESET_ACK:
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osmo_fsm_inst_state_chg(fi, MSC_FSM_ST_CONNECTED, 0, 0);
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break;
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default:
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OSMO_ASSERT(false);
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}
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}
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static void st_disconnected_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_stat)
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{
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osmo_fsm_inst_dispatch(fi, MSC_FSM_EV_TX_RESET, NULL);
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}
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static void st_disconnected(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct msc *msc = fi->priv;
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switch (event) {
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case MSC_FSM_EV_TX_RESET:
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LOGP(DMAIN, LOGL_DEBUG, "Tx RESET to %s\n", talloc_get_name(msc));
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if (bssap_tx_reset(g_bsc_nat->cn.sccp_inst, &msc->addr) < 0) {
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LOGP(DMAIN, LOGL_ERROR, "Could not send RESET to MSC (SCCP not up yet?)\n");
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}
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/* Retry in 3s if RESET ACK was not received from MSC */
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osmo_fsm_inst_state_chg(fi, MSC_FSM_ST_CONNECTING, 3, 0);
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break;
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default:
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OSMO_ASSERT(false);
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}
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}
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int msc_fsm_timer_cb(struct osmo_fsm_inst *fi)
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{
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switch (fi->state) {
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case MSC_FSM_ST_CONNECTING:
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osmo_fsm_inst_state_chg(fi, MSC_FSM_ST_DISCONNECTED, 0, 0);
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break;
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default:
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OSMO_ASSERT(false);
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}
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return 0;
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}
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static struct osmo_fsm_state msc_fsm_states[] = {
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[MSC_FSM_ST_DISCONNECTED] = {
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.name = "DISCONNECTED",
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.in_event_mask = 0
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| X(MSC_FSM_EV_TX_RESET)
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,
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.out_state_mask = 0
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| X(MSC_FSM_ST_CONNECTING)
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,
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.action = st_disconnected,
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.onenter = st_disconnected_on_enter,
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},
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[MSC_FSM_ST_CONNECTING] = {
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.name = "CONNECTING",
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.in_event_mask = 0
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| X(MSC_FSM_EV_RX_RESET_ACK)
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,
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.out_state_mask = 0
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| X(MSC_FSM_ST_CONNECTED)
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| X(MSC_FSM_ST_DISCONNECTED)
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,
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.action = st_connecting,
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},
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[MSC_FSM_ST_CONNECTED] = {
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.name = "CONNECTED",
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.in_event_mask = 0
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| X(MSC_FSM_EV_DISCONNECT)
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,
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.out_state_mask = 0
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| X(MSC_FSM_ST_DISCONNECTED)
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,
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},
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};
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const struct value_string msc_fsm_event_names[] = {
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OSMO_VALUE_STRING(MSC_FSM_EV_TX_RESET),
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OSMO_VALUE_STRING(MSC_FSM_EV_RX_RESET_ACK),
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OSMO_VALUE_STRING(MSC_FSM_EV_DISCONNECT),
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{ 0, NULL }
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};
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struct osmo_fsm msc_fsm = {
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.name = "MSC",
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.states = msc_fsm_states,
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.num_states = ARRAY_SIZE(msc_fsm_states),
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.log_subsys = DMAIN,
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.event_names = msc_fsm_event_names,
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.timer_cb = msc_fsm_timer_cb,
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};
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static __attribute__((constructor)) void msc_fsm_init(void)
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{
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OSMO_ASSERT(osmo_fsm_register(&msc_fsm) == 0);
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}
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void msc_tx_reset(struct msc *msc)
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{
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osmo_fsm_inst_dispatch(msc->fi, MSC_FSM_EV_TX_RESET, NULL);
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}
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void msc_rx_reset_ack(struct msc *msc)
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{
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osmo_fsm_inst_dispatch(msc->fi, MSC_FSM_EV_RX_RESET_ACK, NULL);
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}
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bool msc_is_connected(struct msc *msc)
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{
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return msc->fi->state == MSC_FSM_ST_CONNECTED;
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}
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