142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */
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/*
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* (C) 2009-2010 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2009-2010 by On-Waves
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef OPENBSC_MGCP_H
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#define OPENBSC_MGCP_H
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#include <laf0rge1/msgb.h>
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#include <arpa/inet.h>
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#define RTP_PORT_DEFAULT 4000
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/**
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* Calculate the RTP audio port for the given multiplex
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* and the direction. This allows a semi static endpoint
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* to port calculation removing the need for the BSC
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* and the MediaGateway to communicate.
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*
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* Port usage explained:
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* base + (multiplex * 2) + 0 == local port to wait for network packets
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* base + (multiplex * 2) + 1 == local port for rtcp
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*
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* The above port will receive packets from the BTS that need
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* to be patched and forwarded to the network.
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* The above port will receive packets from the network that
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* need to be patched and forwarded to the BTS.
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*
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* We assume to have a static BTS IP address so we can differentiate
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* network and BTS.
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*
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*/
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static inline int rtp_calculate_port(int multiplex, int base)
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{
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return base + (multiplex * 2);
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}
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/*
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* Handling of MGCP Endpoints and the MGCP Config
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*/
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struct mgcp_endpoint;
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struct mgcp_config;
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#define MGCP_ENDP_CRCX 1
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#define MGCP_ENDP_DLCX 2
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#define MGCP_ENDP_MDCX 3
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/*
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* what to do with the msg?
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* - continue as usual?
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* - reject and send a failure code?
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* - defer? do not send anything
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*/
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#define MGCP_POLICY_CONT 4
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#define MGCP_POLICY_REJECT 5
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#define MGCP_POLICY_DEFER 6
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typedef int (*mgcp_change)(struct mgcp_config *cfg, int endpoint, int state, int local_rtp);
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typedef int (*mgcp_policy)(struct mgcp_config *cfg, int endpoint, int state, const char *transactio_id);
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typedef int (*mgcp_reset)(struct mgcp_config *cfg);
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struct mgcp_config {
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/* common configuration */
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int source_port;
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char *local_ip;
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char *source_addr;
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char *bts_ip;
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char *call_agent_addr;
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/* default endpoint data */
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struct in_addr bts_in;
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char *audio_name;
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int audio_payload;
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int audio_loop;
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int early_bind;
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int rtp_base_port;
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int endp_dscp;
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/* only used in forward mode */
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char *forward_ip;
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int forward_port;
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unsigned int last_call_id;
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/* endpoint configuration */
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unsigned int number_endpoints;
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struct mgcp_endpoint *endpoints;
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/* spec handling */
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int force_realloc;
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/* callback functionality */
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mgcp_change change_cb;
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mgcp_policy policy_cb;
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mgcp_reset reset_cb;
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void *data;
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};
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/* config management */
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struct mgcp_config *mgcp_config_alloc(void);
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int mgcp_parse_config(const char *config_file, struct mgcp_config *cfg);
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int mgcp_vty_init(void);
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int mgcp_endpoints_allocate(struct mgcp_config *cfg);
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int mgcp_bind_rtp_port(struct mgcp_endpoint *endp, int rtp_port);
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void mgcp_free_endp(struct mgcp_endpoint *endp);
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/*
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* format helper functions
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*/
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struct msgb *mgcp_handle_message(struct mgcp_config *cfg, struct msgb *msg);
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struct msgb *mgcp_create_response_with_data(int code, const char *msg, const char *trans, const char *data);
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/* adc helper */
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static inline int mgcp_timeslot_to_endpoint(int multiplex, int timeslot)
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{
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if (timeslot == 0)
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timeslot = 1;
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return timeslot + (31 * multiplex);
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}
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#endif
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