move openbsc/* to repos root

This is the first step in creating this repository from the legacy openbsc.git.

Like all other Osmocom repositories, keep the autoconf and automake files in
the repository root. openbsc.git has been the sole exception, which ends now.

Change-Id: I9c6f2a448d9cb1cc088cf1cf6918b69d7e69b4e7

1 files changed, 139 insertions, 0 deletions

diff --git a/src/libbsc/bsc_rll.c b/src/libbsc/bsc_rll.c
new file mode 100644
index 000000000..bb488da15
--- /dev/null
+++ b/src/libbsc/bsc_rll.c
@@ -0,0 +1,139 @@
+/* GSM BSC Radio Link Layer API
+ * 3GPP TS 08.58 version 8.6.0 Release 1999 / ETSI TS 100 596 V8.6.0 */
+
+/* (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 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 Affero 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 <errno.h>
+
+#include <openbsc/debug.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/core/linuxlist.h>
+#include <openbsc/bsc_rll.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/chan_alloc.h>
+#include <openbsc/abis_rsl.h>
+#include <openbsc/signal.h>
+
+struct bsc_rll_req {
+	struct llist_head list;
+	struct osmo_timer_list timer;
+
+	struct gsm_lchan *lchan;
+	uint8_t link_id;
+
+	void (*cb)(struct gsm_lchan *lchan, uint8_t link_id,
+		   void *data, enum bsc_rllr_ind);
+	void *data;
+};
+
+/* we only compare C1, C2 and SAPI */
+#define LINKID_MASK	0xC7
+
+static LLIST_HEAD(bsc_rll_reqs);
+
+static void complete_rllr(struct bsc_rll_req *rllr, enum bsc_rllr_ind type)
+{
+	llist_del(&rllr->list);
+	rllr->cb(rllr->lchan, rllr->link_id, rllr->data, type);
+	talloc_free(rllr);
+}
+
+static void timer_cb(void *_rllr)
+{
+	struct bsc_rll_req *rllr = _rllr;
+
+	complete_rllr(rllr, BSC_RLLR_IND_TIMEOUT);
+}
+
+/* establish a RLL connection with given SAPI / priority */
+int rll_establish(struct gsm_lchan *lchan, uint8_t sapi,
+		  void (*cb)(struct gsm_lchan *, uint8_t, void *,
+			     enum bsc_rllr_ind),
+		  void *data)
+{
+	struct bsc_rll_req *rllr = talloc_zero(tall_bsc_ctx, struct bsc_rll_req);
+	uint8_t link_id;
+	if (!rllr)
+		return -ENOMEM;
+
+	link_id = sapi;
+
+	/* If we are a TCH and not in signalling mode, we need to
+	 * indicate that the new RLL connection is to be made on the SACCH */
+	if ((lchan->type == GSM_LCHAN_TCH_F ||
+	     lchan->type == GSM_LCHAN_TCH_H) && sapi != 0)
+		link_id |= 0x40;
+
+	rllr->lchan = lchan;
+	rllr->link_id = link_id;
+	rllr->cb = cb;
+	rllr->data = data;
+
+	llist_add(&rllr->list, &bsc_rll_reqs);
+
+	osmo_timer_setup(&rllr->timer, timer_cb, rllr);
+	osmo_timer_schedule(&rllr->timer, 7, 0);
+
+	/* send the RSL RLL ESTablish REQuest */
+	return rsl_establish_request(rllr->lchan, rllr->link_id);
+}
+
+/* Called from RSL code in case we have received an indication regarding
+ * any RLL link */
+void rll_indication(struct gsm_lchan *lchan, uint8_t link_id, uint8_t type)
+{
+	struct bsc_rll_req *rllr, *rllr2;
+
+	llist_for_each_entry_safe(rllr, rllr2, &bsc_rll_reqs, list) {
+		if (rllr->lchan == lchan &&
+		    (rllr->link_id & LINKID_MASK) == (link_id & LINKID_MASK)) {
+			osmo_timer_del(&rllr->timer);
+			complete_rllr(rllr, type);
+			return;
+		}
+	}
+}
+
+static int rll_lchan_signal(unsigned int subsys, unsigned int signal,
+			    void *handler_data, void *signal_data)
+{
+	struct challoc_signal_data *challoc;
+	struct bsc_rll_req *rllr, *rllr2;
+
+	if (subsys != SS_CHALLOC || signal != S_CHALLOC_FREED)
+		return 0;
+
+	challoc = (struct challoc_signal_data *) signal_data;
+
+	llist_for_each_entry_safe(rllr, rllr2, &bsc_rll_reqs, list) {
+		if (rllr->lchan == challoc->lchan) {
+			osmo_timer_del(&rllr->timer);
+			complete_rllr(rllr, BSC_RLLR_IND_ERR_IND);
+		}
+	}
+
+	return 0;
+}
+
+static __attribute__((constructor)) void on_dso_load_rll(void)
+{
+	osmo_signal_register_handler(SS_CHALLOC, rll_lchan_signal, NULL);
+}