wip
Change-Id: Ibc70e0aa00476926dd1f4ea8139c34f31f9cdfa3
diff --git a/include/osmocom/mgcp/iuup_cn_node.h b/include/osmocom/mgcp/iuup_cn_node.h
new file mode 100644
index 0000000..158b6a1
--- /dev/null
+++ b/include/osmocom/mgcp/iuup_cn_node.h
@@ -0,0 +1,46 @@
+/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */
+/* IuUP CN node, minimal implementation */
+
+/* _____IuUP_CN_____
+ * | |
+ * UE <--> RNC --PDU-> osmo_iuup_cn_rx_pdu() -+-> ---+-> rx_payload()
+ * | | |
+ * | <-PDU-- tx_msg() <-------------+-- <-+--- osmo_iuup_cn_tx_payload()
+ * | |
+ * -----------------
+ */
+
+
+#pragma once
+
+struct osmo_iuup_cn;
+struct msgb;
+
+typedef int (*osmo_iuup_data_cb_t)(struct msgb *msg, void *node_priv, void *pdu_priv);
+
+struct osmo_iuup_cn_cfg {
+ void *node_priv;
+
+ /* When an IuUP PDU containing voice payload has been received, this callback is invoked to pass
+ * the voice payload towards the Core Network, msgb_l3() pointing at the payload. */
+ osmo_iuup_data_cb_t rx_payload;
+
+ /* IuUP handler sends a PDU to the IuUP peer (e.g. the RNC) */
+ osmo_iuup_data_cb_t tx_msg;
+};
+
+bool osmo_iuup_cn_is_iuup_init(struct msgb *msg);
+
+struct osmo_iuup_cn *osmo_iuup_cn_init(void *ctx, struct osmo_iuup_cn_cfg *cfg,
+ const char *name_fmt, ...);
+void osmo_iuup_cn_free(struct osmo_iuup_cn *cn);
+
+/* Encapsulate voice stream payload in IuUP and, if appropriate, call the tx_msg() to transmit the
+ * resulting message to the IuUP peer. msgb_l3() should point at the payload data.
+ * pdu_priv is transparently passed on to tx_msg().
+ * Returns 0 on success, negative on error. */
+int osmo_iuup_cn_tx_payload(struct osmo_iuup_cn *cn, struct msgb *payload, void *pdu_priv);
+
+/* Feed a received PDU to the IuUP CN node. This function takes ownership of the msgb, it must not be
+ * freed by the caller. */
+int osmo_iuup_cn_rx_pdu(struct osmo_iuup_cn *cn, struct msgb *pdu, void *pdu_priv);