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osmo-msc/include/osmocom/msc/call_leg.h

81 lines
2.7 KiB

#pragma once
#include <stdint.h>
#include <stdbool.h>
#include <osmocom/core/tdef.h>
struct osmo_fsm_inst;
struct osmo_sockaddr_str;
struct osmo_mgcpc_ep;
struct gsm_network;
struct gsm_trans;
struct rtp_stream;
enum rtp_direction;
extern struct osmo_tdef g_mgw_tdefs[];
/* All sides of an MGW endpoint, connecting remote RTP peers via the MGW.
*
* BSC MGW PBX
* CI CI
* [MGW-endpoint]
* [--rtp_stream--] [--rtp_stream--]
* [----------------call_leg----------------]
*
*/
struct call_leg {
struct osmo_fsm_inst *fi;
struct osmo_mgcpc_ep *mgw_endpoint;
/* Array indexed by enum rtp_direction. */
struct rtp_stream *rtp[2];
/* Array indexed by enum rtp_direction. */
enum mgcp_connection_mode crcx_conn_mode[2];
uint32_t parent_event_rtp_addr_available;
uint32_t parent_event_rtp_complete;
uint32_t parent_event_rtp_released;
/* For internal MNCC, if RTP addresses for endpoints become assigned by the MGW, implicitly notify the other
* call leg's RTP_TO_CN side rtp_stream with rtp_stream_remote_addr_available(). */
struct call_leg *local_bridge;
/* Prevent events from deallocating for certain release code paths, to prevent use-after-free problems. */
bool deallocating;
};
enum call_leg_event {
CALL_LEG_EV_RTP_STREAM_ADDR_AVAILABLE,
CALL_LEG_EV_RTP_STREAM_ESTABLISHED,
CALL_LEG_EV_RTP_STREAM_GONE,
CALL_LEG_EV_MGW_ENDPOINT_GONE,
};
void call_leg_init(struct gsm_network *net);
struct call_leg *call_leg_alloc(struct osmo_fsm_inst *parent_fi,
uint32_t parent_event_term,
uint32_t parent_event_rtp_addr_available,
uint32_t parent_event_rtp_complete,
uint32_t parent_event_rtp_released);
void call_leg_reparent(struct call_leg *cl,
struct osmo_fsm_inst *parent_fi,
uint32_t parent_event_term,
uint32_t parent_event_rtp_addr_available,
uint32_t parent_event_rtp_complete,
uint32_t parent_event_rtp_released);
int call_leg_local_bridge(struct call_leg *cl1, uint32_t call_id1, struct gsm_trans *trans1,
struct call_leg *cl2, uint32_t call_id2, struct gsm_trans *trans2);
int call_leg_ensure_rtp_alloc(struct call_leg *cl, enum rtp_direction dir, uint32_t call_id,
struct gsm_trans *for_trans);
int call_leg_ensure_ci(struct call_leg *cl, enum rtp_direction dir, uint32_t call_id, struct gsm_trans *for_trans,
const enum mgcp_codecs *codec_if_known, const struct osmo_sockaddr_str *remote_port_if_known);
struct osmo_sockaddr_str *call_leg_local_ip(struct call_leg *cl, enum rtp_direction dir);
void call_leg_rtp_stream_gone(struct call_leg *cl, struct rtp_stream *rtps);
void call_leg_release(struct call_leg *cl);