sccp: Notify users of point code available/unavailable

* add N-PCSTATE.ind and N-STATE.ind definitions to SCCP user SAP
* add minimal SCMG (SCCP Management) and LBCS (Local Broadcast)
* generate MTP-PAUSE.ind/MTP-RESUME.ind based on received xUA DUNA/DAVA
* generate N-PCSTATE.ind towards the local SCCP users

Change-Id: Idb799f7d7ab329ad12f07b7cbe6336da0891ae92
Related: OS#2623, OS#3403, OS#4701

1 files changed, 68 insertions, 0 deletions

diff --git a/src/sccp_lbcs.c b/src/sccp_lbcs.c
new file mode 100644
index 0000000..3aa4f7a
--- /dev/null
+++ b/src/sccp_lbcs.c
@@ -0,0 +1,68 @@
+/* SCCP Local Broadcast (LBCS) according to ITU-T Q.713/Q.714 */
+
+/* (C) 2021 by Harald Welte <laforge@gnumonks.org>
+ * All Rights reserved
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <string.h>
+
+#include <osmocom/core/utils.h>
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/core/fsm.h>
+
+#include <osmocom/sigtran/sccp_sap.h>
+#include <osmocom/sigtran/protocol/sua.h>
+#include <osmocom/sccp/sccp_types.h>
+
+#include "xua_internal.h"
+#include "sccp_internal.h"
+
+/* perform a "local broadcast" of a N-PCSTATE.ind */
+void sccp_lbcs_local_bcast_pcstate(struct osmo_sccp_instance *inst,
+				   const struct osmo_scu_pcstate_param *pcstate)
+{
+	struct osmo_sccp_user *scu;
+
+	llist_for_each_entry(scu, &inst->users, list) {
+		struct msgb *upmsg = sccp_msgb_alloc(__func__);
+		struct osmo_scu_prim *prim = (struct osmo_scu_prim *) msgb_put(upmsg, sizeof(*prim));
+		osmo_prim_init(&prim->oph, SCCP_SAP_USER, OSMO_SCU_PRIM_N_PCSTATE,
+				PRIM_OP_INDICATION, upmsg);
+		prim->u.pcstate = *pcstate;
+		sccp_user_prim_up(scu, prim);
+	}
+}
+
+/* perform a "local broadcast" of a N-STATE.ind */
+void sccp_lbcs_local_bcast_state(struct osmo_sccp_instance *inst,
+				 const struct osmo_scu_state_param *state)
+{
+	struct osmo_sccp_user *scu;
+
+	llist_for_each_entry(scu, &inst->users, list) {
+		struct msgb *upmsg = sccp_msgb_alloc(__func__);
+		struct osmo_scu_prim *prim = (struct osmo_scu_prim *) msgb_put(upmsg, sizeof(*prim));
+		osmo_prim_init(&prim->oph, SCCP_SAP_USER, OSMO_SCU_PRIM_N_STATE,
+				PRIM_OP_INDICATION, upmsg);
+		prim->u.state = *state;
+		sccp_user_prim_up(scu, prim);
+	}
+}