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/* TS 23.060 § 6.1.2 Mobility Management States (Iu mode) */
/*
* (C) 2019 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* SPDX-License-Identifier: AGPL-3.0+
*
* Author: Pau Espin Pedrol <pespin@sysmocom.de>
*
* 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 <arpa/inet.h>
#include <osmocom/core/tdef.h>
#include <osmocom/sgsn/gprs_mm_state_iu_fsm.h>
#include <osmocom/sgsn/debug.h>
#include <osmocom/sgsn/sgsn.h>
#include <osmocom/sgsn/gprs_ranap.h>
#include <osmocom/sgsn/gtp.h>
#include <osmocom/sgsn/pdpctx.h>
#define X(s) (1 << (s))
static const struct osmo_tdef_state_timeout mm_state_iu_fsm_timeouts[32] = {
[ST_PMM_DETACHED] = { },
[ST_PMM_CONNECTED] = { },
[ST_PMM_IDLE] = { },
};
#define mm_state_iu_fsm_state_chg(fi, NEXT_STATE) \
osmo_tdef_fsm_inst_state_chg(fi, NEXT_STATE, mm_state_iu_fsm_timeouts, sgsn->cfg.T_defs, -1)
static void mmctx_change_gtpu_endpoints_to_sgsn(struct sgsn_mm_ctx *mm_ctx)
{
char buf[INET_ADDRSTRLEN];
struct sgsn_pdp_ctx *pdp;
llist_for_each_entry(pdp, &mm_ctx->pdp_list, list) {
LOGMMCTXP(LOGL_INFO, mm_ctx, "Changing GTP-U endpoints %s -> %s\n",
sgsn_gtp_ntoa(&pdp->lib->gsnlu),
inet_ntop(AF_INET, &sgsn->cfg.gtp_listenaddr.sin_addr, buf, sizeof(buf)));
sgsn_pdp_upd_gtp_u(pdp,
&sgsn->cfg.gtp_listenaddr.sin_addr,
sizeof(sgsn->cfg.gtp_listenaddr.sin_addr));
}
}
static void st_pmm_detached(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
switch(event) {
case E_PMM_PS_ATTACH:
mm_state_iu_fsm_state_chg(fi, ST_PMM_CONNECTED);
break;
case E_PMM_PS_DETACH:
break;
}
}
static void st_pmm_connected(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
struct sgsn_mm_ctx *ctx = fi->priv;
switch(event) {
case E_PMM_PS_CONN_RELEASE:
sgsn_ranap_iu_free(ctx);
mm_state_iu_fsm_state_chg(fi, ST_PMM_IDLE);
break;
case E_PMM_PS_DETACH:
sgsn_ranap_iu_release_free(ctx, NULL);
mm_state_iu_fsm_state_chg(fi, ST_PMM_DETACHED);
break;
case E_PMM_RA_UPDATE:
break;
}
}
static void st_pmm_idle_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state)
{
struct sgsn_mm_ctx *ctx = fi->priv;
mmctx_change_gtpu_endpoints_to_sgsn(ctx);
}
static void st_pmm_idle(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
switch(event) {
case E_PMM_PS_ATTACH:
case E_PMM_PS_CONN_ESTABLISH:
mm_state_iu_fsm_state_chg(fi, ST_PMM_CONNECTED);
break;
case E_PMM_PS_DETACH:
mm_state_iu_fsm_state_chg(fi, ST_PMM_DETACHED);
break;
}
}
static struct osmo_fsm_state mm_state_iu_fsm_states[] = {
[ST_PMM_DETACHED] = {
.in_event_mask = X(E_PMM_PS_ATTACH) | X(E_PMM_PS_DETACH),
.out_state_mask = X(ST_PMM_CONNECTED),
.name = "Detached",
.action = st_pmm_detached,
},
[ST_PMM_CONNECTED] = {
.in_event_mask =
X(E_PMM_PS_CONN_RELEASE) |
X(E_PMM_RA_UPDATE) |
X(E_PMM_PS_DETACH),
.out_state_mask = X(ST_PMM_DETACHED) | X(ST_PMM_IDLE),
.name = "Connected",
.action = st_pmm_connected,
},
[ST_PMM_IDLE] = {
.in_event_mask =
X(E_PMM_PS_DETACH) |
X(E_PMM_PS_CONN_ESTABLISH) |
X(E_PMM_PS_ATTACH),
.out_state_mask = X(ST_PMM_DETACHED) | X(ST_PMM_CONNECTED),
.name = "Idle",
.onenter = st_pmm_idle_on_enter,
.action = st_pmm_idle,
},
};
const struct value_string mm_state_iu_fsm_event_names[] = {
OSMO_VALUE_STRING(E_PMM_PS_ATTACH),
OSMO_VALUE_STRING(E_PMM_PS_CONN_RELEASE),
OSMO_VALUE_STRING(E_PMM_PS_CONN_ESTABLISH),
OSMO_VALUE_STRING(E_PMM_PS_DETACH),
OSMO_VALUE_STRING(E_PMM_RA_UPDATE),
{ 0, NULL }
};
struct osmo_fsm mm_state_iu_fsm = {
.name = "MM_STATE_Iu",
.states = mm_state_iu_fsm_states,
.num_states = ARRAY_SIZE(mm_state_iu_fsm_states),
.event_names = mm_state_iu_fsm_event_names,
.log_subsys = DMM,
};
static __attribute__((constructor)) void mm_state_iu_fsm_init(void)
{
OSMO_ASSERT(osmo_fsm_register(&mm_state_iu_fsm) == 0);
}
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