osmo-msc/openbsc/src/bsc_api.c

/* GSM 08.08 like API for OpenBSC. The bridge from MSC to BSC */

/* (C) 2010 by Holger Hans Peter Freyther
 * (C) 2010 by On Waves
 * (C) 2009 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 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

#include <openbsc/bsc_api.h>
#include <openbsc/gsm_data.h>
#include <openbsc/signal.h>
#include <openbsc/abis_rsl.h>

#include <osmocore/talloc.h>

int bsc_api_init(struct gsm_network *network, struct bsc_api *api)
{
	network->bsc_api = api;
	return 0;
}

int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
			struct msgb *msg, int link_id)
{
	msg->lchan = conn->lchan;
	msg->trx = msg->lchan->ts->trx;
	return rsl_data_request(msg, link_id);
}

/* dequeue messages to layer 4 */
int bsc_upqueue(struct gsm_network *net)
{
	struct gsm_mncc *mncc;
	struct msgb *msg;
	int work = 0;

	if (net)
		while ((msg = msgb_dequeue(&net->upqueue))) {
			mncc = (struct gsm_mncc *)msg->data;
			if (net->mncc_recv)
				net->mncc_recv(net, mncc->msg_type, mncc);
			work = 1; /* work done */
			talloc_free(msg);
		}

	return work;
}

static int bsc_handle_lchan_signal(unsigned int subsys, unsigned int signal,
				   void *handler_data, void *signal_data)
{
	struct bsc_api *bsc;
	struct gsm_lchan *lchan;

	if (subsys != SS_LCHAN || signal != S_LCHAN_UNEXPECTED_RELEASE)
		return 0;

	lchan = (struct gsm_lchan *)signal_data;
	if (!lchan)
		return 0;


	bsc = lchan->ts->trx->bts->network->bsc_api;
	if (!bsc || !bsc->clear_request)
		return 0;

	bsc->clear_request(&lchan->conn, 0);
	return 0;
}

static __attribute__((constructor)) void on_dso_load_bsc(void)
{
	register_signal_handler(SS_LCHAN, bsc_handle_lchan_signal, NULL);
}