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/gprs_ms_storage.cpp

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2.6 KiB

/* gprs_ms_storage.cpp
*
* Copyright (C) 2015 by Sysmocom s.f.m.c. GmbH
* Author: Jacob Erlbeck <jerlbeck@sysmocom.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "gprs_ms_storage.h"
#include "tbf.h"
#include "bts.h"
extern "C" {
#include <osmocom/core/linuxlist.h>
#include <osmocom/gsm/gsm48.h>
}
#define GPRS_UNDEFINED_IMSI "000"
static void ms_storage_ms_idle_cb(struct GprsMs *ms)
{
llist_del(&ms->list);
if (ms->bts)
bts_stat_item_add(ms->bts, STAT_MS_PRESENT, -1);
if (ms_is_idle(ms))
talloc_free(ms);
}
static void ms_storage_ms_active_cb(struct GprsMs *ms)
{
/* Nothing to do */
}
static struct gpr_ms_callback ms_storage_ms_cb = {
.ms_idle = ms_storage_ms_idle_cb,
.ms_active = ms_storage_ms_active_cb,
};
GprsMsStorage::GprsMsStorage(struct gprs_rlcmac_bts *bts) :
m_bts(bts)
{
INIT_LLIST_HEAD(&m_list);
}
GprsMsStorage::~GprsMsStorage()
{
cleanup();
}
void GprsMsStorage::cleanup()
{
struct llist_head *pos, *tmp;
llist_for_each_safe(pos, tmp, &m_list) {
struct GprsMs *ms = llist_entry(pos, typeof(*ms), list);
ms_set_callback(ms, NULL);
ms_storage_ms_idle_cb(ms);
}
}
GprsMs *GprsMsStorage::get_ms(uint32_t tlli, uint32_t old_tlli, const char *imsi) const
{
struct llist_head *tmp;
GprsMs *ms;
if (tlli != GSM_RESERVED_TMSI || old_tlli != GSM_RESERVED_TMSI) {
llist_for_each(tmp, &m_list) {
ms = llist_entry(tmp, typeof(*ms), list);
if (ms_check_tlli(ms, tlli))
return ms;
if (ms_check_tlli(ms, old_tlli))
return ms;
}
}
/* not found by TLLI */
if (imsi && imsi[0] && strcmp(imsi, GPRS_UNDEFINED_IMSI) != 0) {
llist_for_each(tmp, &m_list) {
ms = llist_entry(tmp, typeof(*ms), list);
if (strcmp(imsi, ms_imsi(ms)) == 0)
return ms;
}
}
return NULL;
}
GprsMs *GprsMsStorage::create_ms()
{
GprsMs *ms;
ms = ms_alloc(m_bts, GSM_RESERVED_TMSI);
ms_set_callback(ms, &ms_storage_ms_cb);
llist_add(&ms->list, &m_list);
if (m_bts)
bts_stat_item_add(m_bts, STAT_MS_PRESENT, 1);
return ms;
}