handover_fsm: send HANDOVER PERFORMED msg on internal ho
When an internal handover is done the specification demands to inform
the MSC about the event.
- Add sending of BSSMAP HANDOVER PERFORMED msg.
Change-Id: If26e5807280e0f75a423b3b04f8e3c698c82a351
Depends: libosmocore I825106858bd89afc9837811b8fed2e8accc82441
Related: OS#3645
diff --git a/src/osmo-bsc/handover_fsm.c b/src/osmo-bsc/handover_fsm.c
index f2836cf..aae50b9 100644
--- a/src/osmo-bsc/handover_fsm.c
+++ b/src/osmo-bsc/handover_fsm.c
@@ -670,6 +670,70 @@
}
}
+static void send_handover_performed(struct gsm_subscriber_connection *conn)
+{
+ struct gsm_lchan *lchan = conn->lchan;
+ struct handover *ho = &conn->ho;
+ struct osmo_cell_global_id *cell;
+ struct gsm0808_handover_performed ho_perf_params = {};
+ struct msgb *msg;
+ struct gsm0808_speech_codec sc;
+ int rc;
+
+ /* Cause 3.2.2.5 */
+ ho_perf_params.cause = GSM0808_CAUSE_HANDOVER_SUCCESSFUL;
+
+ /* Cell Identifier 3.2.2.17 */
+ cell = cgi_for_msc(conn->sccp.msc, conn_get_bts(conn));
+ if (!cell) {
+ LOG_HO(conn, LOGL_ERROR, "Failed to generate Cell Identifier IE, can't send HANDOVER PERFORMED!\n");
+ return;
+ }
+ ho_perf_params.cell_id = (struct gsm0808_cell_id){
+ .id_discr = CELL_IDENT_WHOLE_GLOBAL,
+ .id.global = *cell
+ };
+
+ /* Chosen Channel 3.2.2.33 */
+ ho_perf_params.chosen_channel = gsm0808_chosen_channel(lchan->type, lchan->tch_mode);
+ if (!ho_perf_params.chosen_channel) {
+ LOG_HO(conn, LOGL_ERROR, "Failed to generate Chosen Channel IE, can't send HANDOVER PERFORMED!\n");
+ return;
+ }
+ ho_perf_params.chosen_channel_present = true;
+
+ /* Chosen Encryption Algorithm 3.2.2.44 */
+ ho_perf_params.chosen_encr_alg = lchan->encr.alg_id;
+ ho_perf_params.chosen_encr_alg_present = true;
+
+ if (ho->new_lchan->activate.requires_voice_stream) {
+ /* Speech Version (chosen) 3.2.2.51 */
+ ho_perf_params.speech_version_chosen = gsm0808_permitted_speech(lchan->type, lchan->tch_mode);
+ ho_perf_params.speech_version_chosen_present = true;
+
+ /* Speech Codec (chosen) 3.2.2.104 */
+ if (gscon_is_aoip(conn)) {
+ /* Extrapolate speech codec from speech mode */
+ gsm0808_speech_codec_from_chan_type(&sc, ho_perf_params.speech_version_chosen);
+ sc.cfg = conn->assignment.req.s15_s0;
+ memcpy(&ho_perf_params.speech_codec_chosen, &sc, sizeof(sc));
+ ho_perf_params.speech_codec_chosen_present = true;
+ }
+ }
+
+ msg = gsm0808_create_handover_performed(&ho_perf_params);
+ if (!msg) {
+ LOG_HO(conn, LOGL_ERROR, "Failed to generate message, can't send HANDOVER PERFORMED!\n");
+ return;
+ }
+
+ rc = gscon_sigtran_send(conn, msg);
+ if (rc < 0) {
+ LOG_HO(conn, LOGL_ERROR, "message sending failed, can't send HANDOVER PERFORMED!\n");
+ return;
+ }
+}
+
/* Notify the handover decision algorithm of failure and clear out any handover state. */
void handover_end(struct gsm_subscriber_connection *conn, enum handover_result result)
{
@@ -738,6 +802,10 @@
if (result == HO_RESULT_OK)
conn->ho.created_ci_for_msc = NULL;
+ /* If the performed handover was an INTRA BSC HANDOVER, inform the MSC that a handover has happend */
+ if (result == HO_RESULT_OK && ((ho->scope & HO_INTRA_CELL) || (ho->scope & HO_INTRA_BSC)))
+ send_handover_performed(conn);
+
hdc = handover_decision_callbacks_get(ho->from_hodec_id);
if (hdc && hdc->on_handover_end)
hdc->on_handover_end(conn, result);
diff --git a/tests/handover/handover_test.c b/tests/handover/handover_test.c
index f728c5b..6217ca3 100644
--- a/tests/handover/handover_test.c
+++ b/tests/handover/handover_test.c
@@ -219,6 +219,7 @@
void create_conn(struct gsm_lchan *lchan)
{
static struct bsc_msc_data fake_msc_data = {};
+ fake_msc_data.network = bsc_gsmnet;
static unsigned int next_imsi = 0;
char imsi[sizeof(lchan->conn->bsub->imsi)];
struct gsm_network *net = lchan->ts->trx->bts->network;