lynxis lazus has uploaded this change for review.

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iu_client: add a new event NEW_LAC_RAC

When the IU client learns a new LAC/RAC or
the LAC/RAC has moved from one RNC to another RNC,
inform the user via an event.

Allows the SGSN to track RACs which uses Iu.

Change-Id: I8b1b8c58bf72b00e2705ca87a89a91481bac3470
---
M include/osmocom/ranap/iu_client.h
M src/iu_client.c
2 files changed, 21 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-iuh refs/changes/47/38947/1

diff --git a/include/osmocom/ranap/iu_client.h b/include/osmocom/ranap/iu_client.h
index e2bf8a9..1588b08 100644
--- a/include/osmocom/ranap/iu_client.h
+++ b/include/osmocom/ranap/iu_client.h
@@ -37,11 +37,17 @@
 	struct osmo_timer_list release_timeout;
 };
 
+struct ranap_iu_event_new_lac_rac {
+	const struct osmo_rnc_id *rnc_id;
+	const struct osmo_routing_area_id *rai;
+};
+
 enum ranap_iu_event_type {
 	RANAP_IU_EVENT_RAB_ASSIGN,
 	RANAP_IU_EVENT_SECURITY_MODE_COMPLETE,
 	RANAP_IU_EVENT_IU_RELEASE, /* An actual Iu Release message was received */
 	RANAP_IU_EVENT_LINK_INVALIDATED, /* A SUA link was lost or closed down */
+	RANAP_IU_EVENT_NEW_LAC_RAC, /* Either a new LAC/RAC has been detected */
 };
 
 extern const struct value_string ranap_iu_event_type_names[];
diff --git a/src/iu_client.c b/src/iu_client.c
index 75c7640..c30c237 100644
--- a/src/iu_client.c
+++ b/src/iu_client.c
@@ -112,6 +112,7 @@
 	OSMO_VALUE_STRING(RANAP_IU_EVENT_SECURITY_MODE_COMPLETE),
 	OSMO_VALUE_STRING(RANAP_IU_EVENT_IU_RELEASE),
 	OSMO_VALUE_STRING(RANAP_IU_EVENT_LINK_INVALIDATED),
+	OSMO_VALUE_STRING(RANAP_IU_EVENT_NEW_LAC_RAC),
 	{ 0, NULL }
 };
 
@@ -122,7 +123,7 @@
 	if (!global_iu_event_cb)
 		return 0;
 
-	if (!ue_ctx->notification)
+	if (ue_ctx && !ue_ctx->notification)
 		return 0;
 
 	LOGPIU(LOGL_DEBUG, "Submit Iu event to upper layer: %s\n", ranap_iu_event_type_str(type));
@@ -130,6 +131,17 @@
 	return global_iu_event_cb(ue_ctx, type, data);
 }
 
+static void global_iu_event_new_rac(const struct osmo_rnc_id *rnc_id, const struct osmo_routing_area_id *rai)
+{
+	struct ranap_iu_event_new_lac_rac new_lac_rac = (struct ranap_iu_event_new_lac_rac) {
+	    .rnc_id = rnc_id,
+	    .rai = rai,
+	};
+
+	global_iu_event(NULL, RANAP_IU_EVENT_NEW_LAC_RAC, &new_lac_rac);
+}
+
+
 static void ue_conn_ctx_release_timeout_cb(void *ctx_)
 {
 	struct ranap_ue_conn_ctx *ctx = (struct ranap_ue_conn_ctx *)ctx_;
@@ -326,12 +338,14 @@
 
 		llist_del(&lre->entry);
 		llist_add(&lre->entry, &rnc->lac_rac_list);
+		global_iu_event_new_rac(rnc_id, rai);
 	} else if (!old_rnc) {
 		/* LAC, RAC not recorded yet */
 		LOGPIU(LOGL_NOTICE, "RNC %s: new LAC/RAC %s\n", osmo_rnc_id_name(rnc_id), osmo_rai_name2(rai));
 		lre = talloc_zero(rnc, struct iu_lac_rac_entry);
 		lre->rai = *rai;
 		llist_add(&lre->entry, &rnc->lac_rac_list);
+		global_iu_event_new_rac(rnc_id, rai);
 	}
 	/* else, LAC,RAC already recorded with the current RNC. */
 

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