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/* 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/bsc_rll.h>
#include <openbsc/gsm_data.h>
#include <openbsc/signal.h>
#include <openbsc/abis_rsl.h>
#include <openbsc/chan_alloc.h>
#include <osmocore/talloc.h>
static void rll_ind_cb(struct gsm_lchan *, uint8_t, void *, enum bsc_rllr_ind);
static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id);
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)
{
uint8_t sapi = link_id & 0x7;
msg->lchan = conn->lchan;
msg->trx = msg->lchan->ts->trx;
msg->l3h = msg->data;
if (conn->lchan->sapis[sapi] == LCHAN_SAPI_UNUSED) {
OBSC_LINKID_CB(msg) = link_id;
if (rll_establish(msg->lchan, sapi, rll_ind_cb, msg) != 0) {
msgb_free(msg);
send_sapi_reject(conn, link_id);
return -1;
}
return 0;
} else {
return rsl_data_request(msg, link_id);
}
}
int gsm0808_page(struct gsm_bts *bts, unsigned int page_group, unsigned int mi_len,
uint8_t *mi, int chan_type)
{
return rsl_paging_cmd(bts, page_group, mi_len, mi, chan_type);
}
/* 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;
}
int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id)
{
int rc;
struct bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api;
struct gsm_lchan *lchan;
lchan = msg->lchan;
if (lchan->conn) {
api->dtap(lchan->conn, msg);
} else {
rc = BSC_API_CONN_POL_REJECT;
lchan->conn = subscr_con_allocate(msg->lchan);
if (lchan->conn)
rc = api->compl_l3(lchan->conn, msg, 0);
if (rc != BSC_API_CONN_POL_ACCEPT) {
subscr_con_free(lchan->conn);
lchan_auto_release(lchan);
}
}
return 0;
}
static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id)
{
struct bsc_api *api;
if (!conn)
return;
api = conn->bts->network->bsc_api;
if (!api || !api->sapi_n_reject)
return;
api->sapi_n_reject(conn, link_id);
}
static void rll_ind_cb(struct gsm_lchan *lchan, uint8_t link_id, void *_data, enum bsc_rllr_ind rllr_ind)
{
struct msgb *msg = _data;
switch (rllr_ind) {
case BSC_RLLR_IND_EST_CONF:
rsl_data_request(msg, OBSC_LINKID_CB(msg));
break;
case BSC_RLLR_IND_REL_IND:
case BSC_RLLR_IND_ERR_IND:
case BSC_RLLR_IND_TIMEOUT:
send_sapi_reject(lchan->conn, OBSC_LINKID_CB(msg));
msgb_free(msg);
break;
}
}
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 || !lchan->conn)
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);
}
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