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/* (C) 2016 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <osmocom/core/fsm.h>
#include <openbsc/bsc_api.h>
#include <openbsc/debug.h>
#include <openbsc/vlr.h>
#include <openbsc/osmo_msc.h>
#define S(x) (1 << (x))
/* This FSM primarily exists as a root/anchor to the various other FSM's
* that we are starting during the life time of a subscriber_connection.
* By having this FSM as part of the subscriber_connection, the other
* FSMs can interact naturally with it, i.e. signal it on child
* termination, keep a linked list of all child FSMs, ... */
enum subscr_conn_fsm_state {
/* Initial state, most of its lifetime */
SUB_CON_S_INIT,
/* Release has been initiated and is ongoing */
SUB_CON_S_RELEASING,
/* Release completed, connection closed */
SUB_CON_S_CLOSED,
};
static const struct value_string subscr_conn_fsm_event_names[] = {
{ SUB_CON_E_LU_RES, "LU-RES" },
{ SUB_CON_E_PARQ_RES, "PROC-ARQ-RES" },
{ SUB_CON_E_MO_CLOSE, "MO-CLOSE" },
{ SUB_CON_E_CN_CLOSE, "CN-CLOSE" },
{ SUB_CON_E_CLOSE_CONF, "CLOSE-CONF" },
{ 0, NULL }
};
static void subscr_conn_fsm_f_init(struct osmo_fsm_inst *fi,
uint32_t event, void *data)
{
struct gsm_subscriber_connection *conn = fi->priv;
switch (event) {
case SUB_CON_E_LU_RES:
/* LU has completed, drop ref count */
subscr_con_put(conn);
break;
case SUB_CON_E_PARQ_RES:
/* Proc Acc Req has completed, drop ref count */
subscr_con_put(conn);
break;
case SUB_CON_E_MO_CLOSE:
case SUB_CON_E_CN_CLOSE:
/* TODO: move msc_release_connection() here */
msc_release_connection(conn);
osmo_fsm_inst_state_chg(fi, SUB_CON_S_RELEASING, 0, 0);
break;
}
}
static void subscr_conn_fsm_f_releasing(struct osmo_fsm_inst *fi,
uint32_t event, void *data)
{
struct gsm_subscriber_connection *conn = fi->priv;
OSMO_ASSERT(event == SUB_CON_E_CLOSE_CONF);
subscr_conn_free(conn);
osmo_fsm_inst_state_chg(fi, SUB_CON_S_CLOSED, 0, 0);
osmo_fsm_inst_term(fi, OSMO_FSM_TERM_REGULAR, NULL);
}
static const struct osmo_fsm_state subscr_conn_fsm_states[] = {
[SUB_CON_S_INIT] = {
.in_event_mask = S(SUB_CON_E_LU_RES) |
S(SUB_CON_E_PARQ_RES) |
S(SUB_CON_E_MO_CLOSE) |
S(SUB_CON_E_CN_CLOSE),
.out_state_mask = S(SUB_CON_S_RELEASING) |
S(SUB_CON_S_CLOSED),
.name = "INIT",
.action = subscr_conn_fsm_f_init,
},
[SUB_CON_S_RELEASING] = {
.in_event_mask = S(SUB_CON_E_CLOSE_CONF),
.out_state_mask = S(SUB_CON_S_CLOSED),
.name = "RELEASING",
.action = subscr_conn_fsm_f_releasing,
},
[SUB_CON_S_CLOSED] = {
.name = "CLOSED",
},
};
static struct osmo_fsm subscr_conn_fsm = {
.name = "subscr_conn",
.states = subscr_conn_fsm_states,
.num_states = ARRAY_SIZE(subscr_conn_fsm_states),
.log_subsys = DMM,
.event_names = subscr_conn_fsm_event_names,
};
struct osmo_fsm_inst *
msc_create_conn_fsm(struct gsm_subscriber_connection *conn,
const char *id)
{
struct osmo_fsm_inst *fi;
OSMO_ASSERT(!conn->master_fsm);
fi = osmo_fsm_inst_alloc(&subscr_conn_fsm, conn, conn,
LOGL_NOTICE, id);
if (!fi)
return NULL;
fi->priv = conn;
conn->master_fsm = conn;
}
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