osmux: Rename function and pass msgb directly to it

The new prefix now matches other related functions acting on an osmux
connection.
Pass the msgb to it so simplify new msgb copy.

Change-Id: I8c0121485d0c96f70fe8bcbdb150793d428183ff

include/osmocom/mgcp/osmux.h

@@ -15,7 +15,7 @@ int osmux_init_conn(struct mgcp_conn_rtp *conn);
 int conn_osmux_enable(struct mgcp_conn_rtp *conn);
 void conn_osmux_disable(struct mgcp_conn_rtp *conn);
 int conn_osmux_event_rx_crcx_mdcx(struct mgcp_conn_rtp *conn);
-int osmux_xfrm_to_osmux(char *buf, int buf_len, struct mgcp_conn_rtp *conn);
+int conn_osmux_send_rtp(struct mgcp_conn_rtp *conn, struct msgb *msg);
 int osmux_send_dummy(struct mgcp_conn_rtp *conn);
 
 void osmux_cid_pool_get(uint8_t osmux_cid);

src/libosmo-mgcp/mgcp_network.c

@@ -1020,7 +1020,7 @@ static int mgcp_conn_rtp_dispatch_rtp(struct mgcp_conn_rtp *conn_dst, struct msg
 		LOGPENDP(endp, DRTP, LOGL_DEBUG,
 			 "endpoint type is MGCP_RTP_OSMUX, "
 			 "using osmux_xfrm_to_osmux() to forward data through OSMUX\n");
-		return osmux_xfrm_to_osmux((char*)msgb_data(msg), msgb_length(msg), conn_dst);
+		return conn_osmux_send_rtp(conn_dst, msg);
 	case MGCP_RTP_IUUP:
 		if (proto == MGCP_PROTO_RTP) {
 			LOGPENDP(endp, DRTP, LOGL_DEBUG,

src/libosmo-mgcp/mgcp_osmux.c

@@ -201,14 +201,13 @@ osmux_handle_find_or_create(const struct mgcp_trunk *trunk, const struct osmo_so
 }
 
 /*! send RTP packet through OSMUX connection.
- *  \param[in] buf rtp data
- *  \param[in] buf_len length of rtp data
  *  \param[in] conn associated RTP connection
+ *  \param[in] msg msgb containing an RTP AMR packet
  *  \returns 0 on success, -1 on ERROR */
-int osmux_xfrm_to_osmux(char *buf, int buf_len, struct mgcp_conn_rtp *conn)
+int conn_osmux_send_rtp(struct mgcp_conn_rtp *conn, struct msgb *msg)
 {
 	int ret;
-	struct msgb *msg;
+	struct msgb *msg2;
 
 	if (!conn->end.output_enabled) {
 		rtpconn_osmux_rate_ctr_inc(conn, OSMUX_RTP_PACKETS_TX_DROPPED_CTR);
@@ -222,14 +221,13 @@ int osmux_xfrm_to_osmux(char *buf, int buf_len, struct mgcp_conn_rtp *conn)
 		return -1;
 	}
 
-	msg = msgb_alloc(4096, "RTP");
-	if (!msg)
+	/* msg is not owned by us and will be freed by the caller stack upon return: */
+	msg2 = msgb_copy_c(conn->conn, msg, "osmux-rtp-send");
+	if (!msg2)
 		return -1;
 
-	memcpy(msg->data, buf, buf_len);
-	msgb_put(msg, buf_len);
 
-	while ((ret = osmux_xfrm_input(conn->osmux.in, msg, conn->osmux.remote_cid)) > 0) {
+	while ((ret = osmux_xfrm_input(conn->osmux.in, msg2, conn->osmux.remote_cid)) > 0) {
 		/* batch full, build and deliver it */
 		osmux_xfrm_input_deliver(conn->osmux.in);
 	}
@@ -237,7 +235,7 @@ int osmux_xfrm_to_osmux(char *buf, int buf_len, struct mgcp_conn_rtp *conn)
 		rtpconn_osmux_rate_ctr_inc(conn, OSMUX_RTP_PACKETS_TX_DROPPED_CTR);
 	} else {
 		rtpconn_osmux_rate_ctr_inc(conn, OSMUX_RTP_PACKETS_TX_CTR);
-		rtpconn_osmux_rate_ctr_add(conn, OSMUX_AMR_OCTETS_TX_CTR, buf_len - sizeof(struct rtp_hdr));
+		rtpconn_osmux_rate_ctr_add(conn, OSMUX_AMR_OCTETS_TX_CTR, msgb_length(msg2) - sizeof(struct rtp_hdr));
 	}
 	return 0;
 }