llsk: Add APIs to interact with llsk->link

This also clarifies the type of available uses/features.

Change-Id: I7723467d34670f89710f55c0c6731e2e38560f35

include/osmocom/hnodeb/llsk.h

@@ -30,6 +30,8 @@ struct hnb;
 struct rtp_conn;
 
 int hnb_llsk_alloc(struct hnb *hnb);
+void hnb_llsk_free(struct hnb *hnb);
+int hnb_llsk_start_listen(struct hnb *hnb);
 bool hnb_llsk_connected(const struct hnb *hnb);
 bool hnb_llsk_can_be_configured(struct hnb *hnb);
 

src/osmo-hnodeb/hnb.c

@@ -88,9 +88,7 @@ void hnb_free(struct hnb *hnb)
 	}
 	hnb_iuh_free(hnb);
 
-	osmo_timer_del(&hnb->llsk.defer_configure_ind_timer);
-	osmo_prim_srv_link_free(hnb->llsk.link);
-	hnb->llsk.link = NULL;
+	hnb_llsk_free(hnb);
 
 	hnb_gtp_unbind(hnb);
 

src/osmo-hnodeb/llsk.c

@@ -219,3 +219,15 @@ int hnb_llsk_alloc(struct hnb *hnb)
 	osmo_timer_setup(&hnb->llsk.defer_configure_ind_timer, llsk_defer_configure_ind_timer_cb, hnb);
 	return 0;
 }
+
+void hnb_llsk_free(struct hnb *hnb)
+{
+	osmo_timer_del(&hnb->llsk.defer_configure_ind_timer);
+	osmo_prim_srv_link_free(hnb->llsk.link);
+	hnb->llsk.link = NULL;
+}
+
+int hnb_llsk_start_listen(struct hnb *hnb)
+{
+	return osmo_prim_srv_link_open(g_hnb->llsk.link);
+}

src/osmo-hnodeb/main.c

@@ -275,7 +275,7 @@ int main(int argc, char **argv)
 	}
 
 	/* Start listening on lower layer unix domain socket: */
-	rc = osmo_prim_srv_link_open(g_hnb->llsk.link);
+	rc = hnb_llsk_start_listen(g_hnb);
 	if (rc < 0) {
 		perror("Error opening lower layer socket");
 		exit(1);