/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ /* * (C) 2009-2012 by Holger Hans Peter Freyther * (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 . * */ #ifndef OPENBSC_MGCP_H #define OPENBSC_MGCP_H #include #include #include #include "debug.h" #include #include #include #include #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; /* addr or NULL to fall-back to default */ char *bind_addr; /* 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_send_name; int audio_loop; int no_audio_transcoding; 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; /* addr to bind the server to */ char *osmux_addr; /* 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; /* Pad circuit with dummy messages until we see the first voice * message. */ uint16_t osmux_dummy; }; /* 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