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/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */
/*
* (C) 2009-2010 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2009-2010 by On-Waves
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#ifndef OPENBSC_MGCP_H
#define OPENBSC_MGCP_H
#include "msgb.h"
#include <arpa/inet.h>
#define RTP_PORT_DEFAULT 4000
/**
* Calculate the RTP audio port for the given multiplex
* and the direction. This allows a semi static endpoint
* to port calculation removing the need for the BSC
* and the MediaGateway to communicate.
*
* Port usage explained:
* base + (multiplex * 2) + 0 == local port to wait for network packets
* base + (multiplex * 2) + 1 == local port for rtcp
*
* The above port will receive packets from the BTS that need
* to be patched and forwarded to the network.
* The above port will receive packets from the network that
* need to be patched and forwarded to the BTS.
*
* We assume to have a static BTS IP address so we can differentiate
* network and BTS.
*
*/
static inline int rtp_calculate_port(int multiplex, int base)
{
return base + (multiplex * 2);
}
/*
* Handling of MGCP Endpoints and the MGCP Config
*/
struct mgcp_endpoint;
struct mgcp_config;
#define MGCP_ENDP_CRCX 1
#define MGCP_ENDP_DLCX 2
#define MGCP_ENDP_MDCX 3
/*
* what to do with the msg?
* - continue as usual?
* - reject and send a failure code?
* - defer? do not send anything
*/
#define MGCP_POLICY_CONT 4
#define MGCP_POLICY_REJECT 5
#define MGCP_POLICY_DEFER 6
typedef int (*mgcp_change)(struct mgcp_config *cfg, int endpoint, int state, int local_rtp);
typedef int (*mgcp_policy)(struct mgcp_config *cfg, int endpoint, int state, const char *transactio_id);
struct mgcp_config {
int source_port;
char *local_ip;
char *source_addr;
unsigned int number_endpoints;
char *bts_ip;
struct in_addr bts_in;
char *audio_name;
int audio_payload;
int audio_loop;
int early_bind;
int rtp_base_port;
char *forward_ip;
int forward_port;
mgcp_change change_cb;
mgcp_policy policy_cb;
void *data;
struct mgcp_endpoint *endpoints;
unsigned int last_call_id;
};
/* config management */
struct mgcp_config *mgcp_config_alloc(void);
int mgcp_parse_config(const char *config_file, struct mgcp_config *cfg);
int mgcp_vty_init(void);
int mgcp_endpoints_allocate(struct mgcp_config *cfg);
int mgcp_bind_rtp_port(struct mgcp_endpoint *endp, int rtp_port);
void mgcp_free_endp(struct mgcp_endpoint *endp);
/*
* format helper functions
*/
struct msgb *mgcp_handle_message(struct mgcp_config *cfg, struct msgb *msg);
struct msgb *mgcp_create_rsip(void);
struct msgb *mgcp_create_response_with_data(int code, const char *msg, const char *trans, const char *data);
#endif
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