1 files changed, 37 insertions, 0 deletions
diff --git a/src/host/virt_phy/include/osmocom/bb/virtphy/virtual_um.h b/src/host/virt_phy/include/osmocom/bb/virtphy/virtual_um.h
new file mode 100644
index 00000000..fe060929
--- /dev/null
+++ b/src/host/virt_phy/include/osmocom/bb/virtphy/virtual_um.h
@@ -0,0 +1,37 @@
+#pragma once
+
+/* the "Virtual Um instance" encapsulates the multicast UDP sockets as
+ * well as the encoding and decoding of GSMTAP messages towards the
+ * virtual radio interface. It receives DL messages via GSMTAP from any
+ * number of BTSs transmitting to GSMTAP, and transmits UL messages via
+ * GSMTAP to those BTSs in another multicast group */
+
+#include <osmocom/core/select.h>
+#include <osmocom/core/msgb.h>
+#include "osmo_mcast_sock.h"
+
+/* We use multicast group addresses from the 239.192.0.0/14 rage, as
+ * those are designated by RFC2365 as "IPv4 Organization Local Scope,
+ * "... the space from which an organization should allocate sub-
+ *  ranges when defining scopes for private use." */
+
+#define VIRT_UM_MSGB_SIZE	256
+#define DEFAULT_MS_MCAST_GROUP	"239.193.23.1"
+#define DEFAULT_MS_MCAST_PORT 4729 /* IANA-registered port for GSMTAP */
+#define DEFAULT_BTS_MCAST_GROUP	"239.193.23.2"
+#define DEFAULT_BTS_MCAST_PORT 4729 /* IANA-registered port for GSMTAP */
+
+struct virt_um_inst {
+	void *priv;
+	struct mcast_bidir_sock *mcast_sock;
+	void (*recv_cb)(struct virt_um_inst *vui, struct msgb *msg);
+};
+
+struct virt_um_inst *virt_um_init(
+                void *ctx, char *tx_mcast_group, uint16_t tx_mcast_port,
+                char *rx_mcast_group, uint16_t rx_mcast_port, int ttl, const char *dev_name,
+                void (*recv_cb)(struct virt_um_inst *vui, struct msgb *msg));
+
+void virt_um_destroy(struct virt_um_inst *vui);
+
+int virt_um_write_msg(struct virt_um_inst *vui, struct msgb *msg);