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, 152 insertions, 0 deletions

diff --git a/src/libmsc/silent_call.c b/src/libmsc/silent_call.c
new file mode 100644
index 000000000..590d01bbf
--- /dev/null
+++ b/src/libmsc/silent_call.c
@@ -0,0 +1,152 @@
+/* GSM silent call feature */
+
+/*
+ * (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 <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <osmocom/core/msgb.h>
+#include <openbsc/signal.h>
+#include <openbsc/debug.h>
+#include <openbsc/paging.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/gsm_subscriber.h>
+#include <openbsc/abis_rsl.h>
+#include <openbsc/chan_alloc.h>
+#include <openbsc/osmo_msc.h>
+
+/* paging of the requested subscriber has completed */
+static int paging_cb_silent(unsigned int hooknum, unsigned int event,
+			    struct msgb *msg, void *_conn, void *_data)
+{
+	struct gsm_subscriber_connection *conn = _conn;
+	struct scall_signal_data sigdata;
+	int rc = 0;
+
+	if (hooknum != GSM_HOOK_RR_PAGING)
+		return -EINVAL;
+
+	DEBUGP(DLSMS, "paging_cb_silent: ");
+
+	sigdata.conn = conn;
+	sigdata.data = _data;
+
+	switch (event) {
+	case GSM_PAGING_SUCCEEDED:
+		DEBUGPC(DLSMS, "success, using Timeslot %u on ARFCN %u\n",
+			conn->lchan->ts->nr, conn->lchan->ts->trx->arfcn);
+		conn->silent_call = 1;
+		/* increment lchan reference count */
+		osmo_signal_dispatch(SS_SCALL, S_SCALL_SUCCESS, &sigdata);
+		break;
+	case GSM_PAGING_EXPIRED:
+	case GSM_PAGING_BUSY:
+	case GSM_PAGING_OOM:
+		DEBUGP(DLSMS, "expired\n");
+		osmo_signal_dispatch(SS_SCALL, S_SCALL_EXPIRED, &sigdata);
+		break;
+	default:
+		rc = -EINVAL;
+		break;
+	}
+
+	return rc;
+}
+
+#if 0
+/* receive a layer 3 message from a silent call */
+int silent_call_rx(struct gsm_subscriber_connection *conn, struct msgb *msg)
+{
+	/* FIXME: do something like sending it through a UDP port */
+	LOGP(DLSMS, LOGL_NOTICE, "Discarding L3 message from a silent call.\n");
+	return 0;
+}
+#endif
+
+struct msg_match {
+	uint8_t pdisc;
+	uint8_t msg_type;
+};
+
+/* list of messages that are handled inside OpenBSC, even in a silent call */
+static const struct msg_match silent_call_accept[] = {
+	{ GSM48_PDISC_MM, GSM48_MT_MM_LOC_UPD_REQUEST },
+	{ GSM48_PDISC_MM, GSM48_MT_MM_CM_SERV_REQ },
+};
+
+#if 0
+/* decide if we need to reroute a message as part of a silent call */
+int silent_call_reroute(struct gsm_subscriber_connection *conn, struct msgb *msg)
+{
+	struct gsm48_hdr *gh = msgb_l3(msg);
+	uint8_t pdisc = gsm48_hdr_pdisc(gh);
+	uint8_t msg_type = gsm48_hdr_msg_type(gh);
+	int i;
+
+	/* if we're not part of a silent call, never reroute */
+	if (!conn->silent_call)
+		return 0;
+
+	/* check if we are a special message that is handled in openbsc */
+	for (i = 0; i < ARRAY_SIZE(silent_call_accept); i++) {
+		if (silent_call_accept[i].pdisc == pdisc &&
+		    silent_call_accept[i].msg_type == msg_type)
+			return 0;
+	}
+
+	/* otherwise, reroute */
+	LOGP(DLSMS, LOGL_INFO, "Rerouting L3 message from a silent call.\n");
+	return 1;
+}
+#endif
+
+
+/* initiate a silent call with a given subscriber */
+int gsm_silent_call_start(struct gsm_subscriber *subscr, void *data, int type)
+{
+	struct subscr_request *req;
+
+	req = subscr_request_channel(subscr, type, paging_cb_silent, data);
+	return req != NULL;
+}
+
+/* end a silent call with a given subscriber */
+int gsm_silent_call_stop(struct gsm_subscriber *subscr)
+{
+	struct gsm_subscriber_connection *conn;
+
+	conn = connection_for_subscr(subscr);
+	if (!conn)
+		return -EINVAL;
+
+	/* did we actually establish a silent call for this guy? */
+	if (!conn->silent_call)
+		return -EINVAL;
+
+	DEBUGPC(DLSMS, "Stopping silent call using Timeslot %u on ARFCN %u\n",
+		conn->lchan->ts->nr, conn->lchan->ts->trx->arfcn);
+
+	conn->silent_call = 0;
+	msc_release_connection(conn);
+
+	return 0;
+}