1 files changed, 95 insertions, 0 deletions
diff --git a/include/openbsc/rtp_proxy.h b/include/openbsc/rtp_proxy.h
new file mode 100644
index 000000000..52ffefd27
--- /dev/null
+++ b/include/openbsc/rtp_proxy.h
@@ -0,0 +1,95 @@
+#ifndef _RTP_PROXY_H
+#define _RTP_PROXY_H
+
+/* RTP proxy handling for ip.access nanoBTS */
+
+/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+
+#include <netinet/in.h>
+
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/select.h>
+
+#include <openbsc/mncc.h>
+
+#define RTP_PT_GSM_FULL 3
+#define RTP_PT_GSM_HALF 96
+#define RTP_PT_GSM_EFR 97
+#define RTP_PT_AMR 98
+#define RTP_LEN_GSM_FULL 33
+#define RTP_LEN_GSM_HALF 15
+#define RTP_LEN_GSM_EFR 31
+#define RTP_GSM_DURATION 160
+
+enum rtp_rx_action {
+	RTP_NONE,
+	RTP_PROXY,
+	RTP_RECV_UPSTREAM,
+};
+
+enum rtp_tx_action {
+	RTP_SEND_NONE,
+	RTP_SEND_DOWNSTREAM,
+};
+
+struct rtp_sub_socket {
+	struct sockaddr_in sin_local;
+	struct sockaddr_in sin_remote;
+
+	struct osmo_fd bfd;
+	/* linked list of to-be-transmitted msgb's */
+	struct llist_head tx_queue;
+};
+
+struct rtp_socket {
+	struct llist_head list;
+
+	struct rtp_sub_socket rtp;
+	struct rtp_sub_socket rtcp;
+
+	/* what should we do on receive? */
+	enum rtp_rx_action rx_action;
+	union {
+		struct {
+			struct rtp_socket *other_sock;
+		} proxy;
+		struct {
+			struct gsm_network *net;
+			uint32_t callref;
+		} receive;
+	};
+	enum rtp_tx_action tx_action;
+	struct {
+		uint16_t sequence;
+		uint32_t timestamp;
+		uint32_t ssrc;
+		struct timeval last_tv;
+	} transmit;
+};
+
+struct rtp_socket *rtp_socket_create(void);
+int rtp_socket_bind(struct rtp_socket *rs, uint32_t ip);
+int rtp_socket_connect(struct rtp_socket *rs, uint32_t ip, uint16_t port);
+int rtp_socket_proxy(struct rtp_socket *this, struct rtp_socket *other);
+int rtp_socket_upstream(struct rtp_socket *this, struct gsm_network *net, uint32_t callref);
+int rtp_socket_free(struct rtp_socket *rs);
+int rtp_send_frame(struct rtp_socket *rs, struct gsm_data_frame *frame);
+
+#endif /* _RTP_PROXY_H */