| /* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ |
| |
| /* |
| * (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * (C) 2009-2012 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 <osmocom/core/msgb.h> |
| #include <osmocom/core/write_queue.h> |
| #include <osmocom/core/timer.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; |
| struct mgcp_rtp_end; |
| |
| #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_trunk_config *cfg); |
| typedef int (*mgcp_rqnt)(struct mgcp_endpoint *endp, char tone); |
| |
| /** |
| * Return: |
| * < 0 in case no audio was processed |
| * >= 0 in case audio was processed. The remaining payload |
| * length will be returned. |
| */ |
| typedef int (*mgcp_processing)(struct mgcp_endpoint *endp, |
| struct mgcp_rtp_end *dst_end, |
| char *data, int *len, int buf_size); |
| typedef int (*mgcp_processing_setup)(struct mgcp_endpoint *endp, |
| struct mgcp_rtp_end *dst_end, |
| struct mgcp_rtp_end *src_end); |
| |
| typedef void (*mgcp_get_format)(struct mgcp_endpoint *endp, |
| int *payload_type, |
| const char**subtype_name, |
| const char**fmtp_extra); |
| |
| #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; |
| }; |
| |
| #define MGCP_KEEPALIVE_ONCE (-1) |
| |
| struct mgcp_trunk_config { |
| struct llist_head entry; |
| |
| struct mgcp_config *cfg; |
| |
| int trunk_nr; |
| int trunk_type; |
| |
| char *audio_fmtp_extra; |
| char *audio_name; |
| int audio_payload; |
| int audio_send_ptime; |
| int audio_loop; |
| |
| int omit_rtcp; |
| int keepalive_interval; |
| |
| /* RTP patching */ |
| int force_constant_ssrc; /* 0: don't, 1: once */ |
| int force_aligned_timing; |
| |
| /* spec handling */ |
| int force_realloc; |
| |
| /* timer */ |
| struct osmo_timer_list keepalive_timer; |
| |
| unsigned int number_endpoints; |
| struct mgcp_endpoint *endpoints; |
| }; |
| |
| enum mgcp_role { |
| MGCP_BSC = 0, |
| MGCP_BSC_NAT, |
| }; |
| |
| 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; |
| |
| /* RTP processing */ |
| mgcp_processing rtp_processing_cb; |
| mgcp_processing_setup setup_rtp_processing_cb; |
| |
| mgcp_get_format get_net_downlink_format_cb; |
| |
| struct osmo_wqueue gw_fd; |
| |
| struct mgcp_port_range bts_ports; |
| struct mgcp_port_range net_ports; |
| struct mgcp_port_range transcoder_ports; |
| int endp_dscp; |
| |
| int bts_force_ptime; |
| |
| mgcp_change change_cb; |
| mgcp_policy policy_cb; |
| mgcp_reset reset_cb; |
| mgcp_realloc realloc_cb; |
| mgcp_rqnt rqnt_cb; |
| void *data; |
| |
| uint32_t last_call_id; |
| |
| /* trunk handling */ |
| struct mgcp_trunk_config trunk; |
| struct llist_head trunks; |
| |
| /* only used for start with a static configuration */ |
| int last_net_port; |
| int last_bts_port; |
| |
| enum mgcp_role role; |
| |
| /* osmux translator: 0 means disabled, 1 means enabled */ |
| int osmux; |
| /* The BSC-NAT may ask for enabling osmux on demand. This tells us if |
| * the osmux socket is already initialized. |
| */ |
| int osmux_init; |
| /* osmux batch factor: from 1 to 4 maximum */ |
| int osmux_batch; |
| /* osmux batch size (in bytes) */ |
| int osmux_batch_size; |
| /* osmux port */ |
| uint16_t osmux_port; |
| }; |
| |
| /* config management */ |
| struct mgcp_config *mgcp_config_alloc(void); |
| int mgcp_parse_config(const char *config_file, struct mgcp_config *cfg, |
| enum mgcp_role role); |
| int mgcp_vty_init(void); |
| int mgcp_endpoints_allocate(struct mgcp_trunk_config *cfg); |
| void mgcp_release_endp(struct mgcp_endpoint *endp); |
| void mgcp_initialize_endp(struct mgcp_endpoint *endp); |
| int mgcp_reset_transcoder(struct mgcp_config *cfg); |
| void mgcp_format_stats(struct mgcp_endpoint *endp, char *stats, size_t size); |
| int mgcp_parse_stats(struct msgb *msg, uint32_t *ps, uint32_t *os, uint32_t *pr, uint32_t *_or, int *loss, uint32_t *jitter); |
| |
| void mgcp_trunk_set_keepalive(struct mgcp_trunk_config *tcfg, int interval); |
| |
| /* |
| * format helper functions |
| */ |
| struct msgb *mgcp_handle_message(struct mgcp_config *cfg, struct msgb *msg); |
| |
| /* 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; |
| } |
| |
| int mgcp_send_reset_ep(struct mgcp_endpoint *endp, int endpoint); |
| int mgcp_send_reset_all(struct mgcp_config *cfg); |
| |
| |
| int mgcp_create_bind(const char *source_addr, struct osmo_fd *fd, int port); |
| int mgcp_send(struct mgcp_endpoint *endp, int dest, int is_rtp, struct sockaddr_in *addr, char *buf, int rc); |
| int mgcp_udp_send(int fd, struct in_addr *addr, int port, char *buf, int len); |
| |
| #endif |