Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
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osmo-pcu/src/bts_pch_timer.c

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/*
* Copyright (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* Author: Oliver Smith
*
* 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 Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <string.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/tdef.h>
#include <osmocom/core/utils.h>
#include <gprs_debug.h>
#include <gprs_pcu.h>
#include <bts_pch_timer.h>
#include <gprs_ms.h>
static struct bts_pch_timer *bts_pch_timer_get_by_ptmsi(struct gprs_rlcmac_bts *bts, uint32_t ptmsi)
{
struct bts_pch_timer *p;
OSMO_ASSERT(ptmsi != GSM_RESERVED_TMSI);
llist_for_each_entry(p, &bts->pch_timer, entry) {
if (p->ptmsi != GSM_RESERVED_TMSI && p->ptmsi == ptmsi)
return p;
}
return NULL;
}
struct bts_pch_timer *bts_pch_timer_get_by_imsi(struct gprs_rlcmac_bts *bts, const char *imsi)
{
struct bts_pch_timer *p;
llist_for_each_entry(p, &bts->pch_timer, entry) {
if (strcmp(p->imsi, imsi) == 0)
return p;
}
return NULL;
}
static void bts_pch_timer_remove(struct bts_pch_timer *p)
{
osmo_timer_del(&p->T3113);
llist_del(&p->entry);
LOGP(DPCU, LOGL_DEBUG, "PCH paging timer stopped for IMSI=%s\n", p->imsi);
talloc_free(p);
}
static void T3113_callback(void *data)
{
struct bts_pch_timer *p = data;
LOGP(DPCU, LOGL_INFO, "PCH paging timeout for IMSI=%s\n", p->imsi);
bts_do_rate_ctr_inc(p->bts, CTR_PCH_REQUESTS_TIMEDOUT);
bts_pch_timer_remove(p);
}
void bts_pch_timer_start(struct gprs_rlcmac_bts *bts, const struct osmo_mobile_identity *mi_paging,
const char *imsi)
{
struct bts_pch_timer *p;
struct osmo_tdef *tdef;
p = talloc_zero(bts, struct bts_pch_timer);
llist_add_tail(&p->entry, &bts->pch_timer);
p->bts = bts;
OSMO_STRLCPY_ARRAY(p->imsi, imsi);
p->ptmsi = (mi_paging->type == GSM_MI_TYPE_TMSI) ? mi_paging->tmsi : GSM_RESERVED_TMSI;
tdef = osmo_tdef_get_entry(the_pcu->T_defs, 3113);
OSMO_ASSERT(tdef);
osmo_timer_setup(&p->T3113, T3113_callback, p);
osmo_timer_schedule(&p->T3113, tdef->val, 0);
if (log_check_level(DPCU, LOGL_DEBUG)) {
char str[64];
osmo_mobile_identity_to_str_buf(str, sizeof(str), mi_paging);
LOGP(DPCU, LOGL_DEBUG, "PCH paging timer started for MI=%s IMSI=%s\n", str, p->imsi);
}
}
void bts_pch_timer_stop(struct gprs_rlcmac_bts *bts, const struct GprsMs *ms)
{
struct bts_pch_timer *p = NULL;
uint32_t tlli = ms_tlli(ms);
const char *imsi = ms_imsi(ms);
/* First try matching by TMSI if available in MS */
if (tlli != GSM_RESERVED_TMSI)
p = bts_pch_timer_get_by_ptmsi(bts, tlli);
/* Otherwise try matching by IMSI if available in MS */
if (!p && imsi[0] != '\0')
p = bts_pch_timer_get_by_imsi(bts, imsi);
if (p)
bts_pch_timer_remove(p);
}
void bts_pch_timer_stop_all(struct gprs_rlcmac_bts *bts)
{
struct bts_pch_timer *p, *n;
llist_for_each_entry_safe(p, n, &bts->pch_timer, entry) {
bts_pch_timer_remove(p);
}
}