141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/* GSM 08.08 like API for OpenBSC. The bridge from MSC to BSC */
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/* (C) 2010 by Holger Hans Peter Freyther
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* (C) 2010 by On Waves
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* (C) 2009 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <openbsc/bsc_api.h>
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#include <openbsc/bsc_rll.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/signal.h>
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#include <openbsc/abis_rsl.h>
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#include <osmocore/talloc.h>
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static void rll_ind_cb(struct gsm_lchan *, uint8_t, void *, enum bsc_rllr_ind);
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static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id);
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int bsc_api_init(struct gsm_network *network, struct bsc_api *api)
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{
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network->bsc_api = api;
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return 0;
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}
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int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
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struct msgb *msg, int link_id)
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{
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uint8_t sapi = link_id & 0x7;
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msg->lchan = conn->lchan;
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msg->trx = msg->lchan->ts->trx;
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if (conn->lchan->sapis[sapi] == LCHAN_SAPI_UNUSED) {
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OBSC_LINKID_CB(msg) = link_id;
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if (rll_establish(msg->lchan, sapi, rll_ind_cb, msg) != 0) {
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msgb_free(msg);
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send_sapi_reject(conn, link_id);
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return -1;
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}
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return 0;
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} else {
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return rsl_data_request(msg, link_id);
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}
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}
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int gsm0808_page(struct gsm_bts *bts, unsigned int page_group, unsigned int mi_len,
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uint8_t *mi, int chan_type)
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{
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return rsl_paging_cmd(bts, page_group, mi_len, mi, chan_type);
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}
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/* dequeue messages to layer 4 */
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int bsc_upqueue(struct gsm_network *net)
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{
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struct gsm_mncc *mncc;
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struct msgb *msg;
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int work = 0;
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if (net)
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while ((msg = msgb_dequeue(&net->upqueue))) {
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mncc = (struct gsm_mncc *)msg->data;
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if (net->mncc_recv)
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net->mncc_recv(net, mncc->msg_type, mncc);
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work = 1; /* work done */
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talloc_free(msg);
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}
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return work;
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}
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static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id)
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{
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struct bsc_api *api;
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api = conn->bts->network->bsc_api;
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if (!api || !api->sapi_n_reject)
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return;
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api->sapi_n_reject(conn, link_id);
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}
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static void rll_ind_cb(struct gsm_lchan *lchan, uint8_t link_id, void *_data, enum bsc_rllr_ind rllr_ind)
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{
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struct msgb *msg = _data;
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switch (rllr_ind) {
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case BSC_RLLR_IND_EST_CONF:
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rsl_data_request(msg, OBSC_LINKID_CB(msg));
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break;
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case BSC_RLLR_IND_REL_IND:
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case BSC_RLLR_IND_ERR_IND:
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case BSC_RLLR_IND_TIMEOUT:
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send_sapi_reject(&lchan->conn, OBSC_LINKID_CB(msg));
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msgb_free(msg);
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break;
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}
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}
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static int bsc_handle_lchan_signal(unsigned int subsys, unsigned int signal,
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void *handler_data, void *signal_data)
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{
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struct bsc_api *bsc;
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struct gsm_lchan *lchan;
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if (subsys != SS_LCHAN || signal != S_LCHAN_UNEXPECTED_RELEASE)
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return 0;
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lchan = (struct gsm_lchan *)signal_data;
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if (!lchan)
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return 0;
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bsc = lchan->ts->trx->bts->network->bsc_api;
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if (!bsc || !bsc->clear_request)
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return 0;
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bsc->clear_request(&lchan->conn, 0);
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return 0;
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}
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static __attribute__((constructor)) void on_dso_load_bsc(void)
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{
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register_signal_handler(SS_LCHAN, bsc_handle_lchan_signal, NULL);
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}
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