195 lines
4.8 KiB
C
195 lines
4.8 KiB
C
/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */
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/*
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* (C) 2009-2011 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2009-2011 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 Affero General Public License as published by
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* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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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 <osmocom/core/msgb.h>
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#include <osmocom/core/write_queue.h>
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#include "debug.h"
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#include <arpa/inet.h>
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#define RTP_PORT_DEFAULT 4000
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#define RTP_PORT_NET_DEFAULT 16000
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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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struct mgcp_trunk_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_realloc)(struct mgcp_trunk_config *cfg, int endpoint);
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typedef int (*mgcp_change)(struct mgcp_trunk_config *cfg, int endpoint, int state);
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typedef int (*mgcp_policy)(struct mgcp_trunk_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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#define PORT_ALLOC_STATIC 0
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#define PORT_ALLOC_DYNAMIC 1
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/**
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* This holds information on how to allocate ports
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*/
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struct mgcp_port_range {
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int mode;
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/* pre-allocated from a base? */
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int base_port;
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/* dynamically allocated */
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int range_start;
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int range_end;
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int last_port;
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};
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struct mgcp_trunk_config {
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struct llist_head entry;
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struct mgcp_config *cfg;
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int trunk_nr;
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int trunk_type;
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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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/* spec handling */
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int force_realloc;
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unsigned int number_endpoints;
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struct mgcp_endpoint *endpoints;
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};
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struct mgcp_config {
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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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struct in_addr bts_in;
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/* transcoder handling */
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char *transcoder_ip;
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struct in_addr transcoder_in;
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int transcoder_remote_base;
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struct write_queue gw_fd;
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struct mgcp_port_range bts_ports;
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struct mgcp_port_range net_ports;
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struct mgcp_port_range transcoder_ports;
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int endp_dscp;
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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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mgcp_realloc realloc_cb;
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void *data;
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uint32_t last_call_id;
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/* trunk handling */
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struct mgcp_trunk_config trunk;
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struct llist_head trunks;
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/* only used for start with a static configuration */
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int last_net_port;
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int last_bts_port;
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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_trunk_config *cfg);
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void mgcp_free_endp(struct mgcp_endpoint *endp);
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int mgcp_reset_transcoder(struct mgcp_config *cfg);
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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 *txt, 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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LOGP(DMGCP, LOGL_ERROR, "Timeslot should not be 0\n");
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timeslot = 255;
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}
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return timeslot + (32 * multiplex);
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}
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static inline void mgcp_endpoint_to_timeslot(int endpoint, int *multiplex, int *timeslot)
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{
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*multiplex = endpoint / 32;
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*timeslot = endpoint % 32;
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}
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#endif
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