| /* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ |
| |
| /* |
| * (C) 2009-2011 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * (C) 2009-2011 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 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/>. |
| * |
| */ |
| |
| #ifndef OPENBSC_MGCP_H |
| #define OPENBSC_MGCP_H |
| |
| #include <osmocore/msgb.h> |
| #include <osmocore/write_queue.h> |
| |
| #include "debug.h" |
| |
| #include <arpa/inet.h> |
| |
| #define RTP_PORT_DEFAULT 4000 |
| #define RTP_PORT_NET_DEFAULT 16000 |
| |
| /** |
| * 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; |
| struct mgcp_trunk_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_realloc)(struct mgcp_trunk_config *cfg, int endpoint); |
| typedef int (*mgcp_change)(struct mgcp_trunk_config *cfg, int endpoint, int state); |
| typedef int (*mgcp_policy)(struct mgcp_trunk_config *cfg, int endpoint, int state, const char *transactio_id); |
| typedef int (*mgcp_reset)(struct mgcp_config *cfg); |
| |
| #define PORT_ALLOC_STATIC 0 |
| #define PORT_ALLOC_DYNAMIC 1 |
| |
| /** |
| * This holds information on how to allocate ports |
| */ |
| struct mgcp_port_range { |
| int mode; |
| |
| /* pre-allocated from a base? */ |
| int base_port; |
| |
| /* dynamically allocated */ |
| int range_start; |
| int range_end; |
| int last_port; |
| }; |
| |
| struct mgcp_trunk_config { |
| struct llist_head entry; |
| |
| struct mgcp_config *cfg; |
| |
| int trunk_nr; |
| int trunk_type; |
| |
| char *audio_name; |
| int audio_payload; |
| int audio_loop; |
| |
| /* spec handling */ |
| int force_realloc; |
| |
| unsigned int number_endpoints; |
| struct mgcp_endpoint *endpoints; |
| }; |
| |
| struct mgcp_config { |
| int source_port; |
| char *local_ip; |
| char *source_addr; |
| char *bts_ip; |
| char *call_agent_addr; |
| |
| struct in_addr bts_in; |
| |
| /* transcoder handling */ |
| char *transcoder_ip; |
| struct in_addr transcoder_in; |
| int transcoder_remote_base; |
| |
| struct write_queue gw_fd; |
| |
| struct mgcp_port_range bts_ports; |
| struct mgcp_port_range net_ports; |
| struct mgcp_port_range transcoder_ports; |
| int endp_dscp; |
| |
| mgcp_change change_cb; |
| mgcp_policy policy_cb; |
| mgcp_reset reset_cb; |
| mgcp_realloc realloc_cb; |
| void *data; |
| |
| uint32_t last_call_id; |
| |
| /* trunk handling */ |
| struct mgcp_trunk_config trunk; |
| struct llist_head trunks; |
| }; |
| |
| /* 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_trunk_config *cfg); |
| void mgcp_free_endp(struct mgcp_endpoint *endp); |
| int mgcp_reset_transcoder(struct mgcp_config *cfg); |
| |
| /* |
| * format helper functions |
| */ |
| struct msgb *mgcp_handle_message(struct mgcp_config *cfg, struct msgb *msg); |
| struct msgb *mgcp_create_response_with_data(int code, const char *txt, const char *msg, const char *trans, const char *data); |
| |
| /* adc helper */ |
| static inline int mgcp_timeslot_to_endpoint(int multiplex, int timeslot) |
| { |
| if (timeslot == 0) { |
| LOGP(DMGCP, LOGL_ERROR, "Timeslot should not be 0\n"); |
| timeslot = 255; |
| } |
| |
| return timeslot + (32 * multiplex); |
| } |
| |
| static inline void mgcp_endpoint_to_timeslot(int endpoint, int *multiplex, int *timeslot) |
| { |
| *multiplex = endpoint / 32; |
| *timeslot = endpoint % 32; |
| } |
| |
| |
| #endif |