144 lines
5.0 KiB
C
144 lines
5.0 KiB
C
/* Handle an MNCC managed call (external MNCC). */
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/*
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* (C) 2019 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* SPDX-License-Identifier: AGPL-3.0+
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*
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* Author: Neels Hofmeyr
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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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#pragma once
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#include <osmocom/mgcp_client/mgcp_client.h>
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#include <osmocom/msc/mncc.h>
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#include <osmocom/msc/mncc_call.h>
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struct osmo_fsm_inst;
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struct rtp_stream;
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#define LOG_MNCC_CALL(MNCC, LEVEL, FMT, ARGS...) \
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LOGPFSML((MNCC) ? (MNCC)->fi : NULL, LEVEL, FMT, ##ARGS)
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enum mncc_call_fsm_event {
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/* An MNCC message was received from the MNCC socket. The data argument is a const union mncc_msg* pointing at
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* the message contents. */
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MNCC_CALL_EV_RX_MNCC_MSG,
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/* The user has invoked mncc_call_outgoing_start(); this event exists to ensure that the FSM is in a state that
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* allows starting a new outgoing call. */
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MNCC_CALL_EV_OUTGOING_START,
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/* The MNCC server has sent an MNCC_ALERT_REQ. */
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MNCC_CALL_EV_OUTGOING_ALERTING,
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/* The MNCC server has confirmed call setup with an MNCC_SETUP_RSP, we have sent an MNCC_SETUP_COMPL_IND. */
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MNCC_CALL_EV_OUTGOING_SETUP_COMPLETE,
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/* The user has invoked mncc_call_incoming_start(); this event exists to ensure that the FSM is in a state that
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* allows starting a new incoming call. */
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MNCC_CALL_EV_INCOMING_START,
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/* MNCC server sent an MNCC_SETUP_REQ */
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MNCC_CALL_EV_INCOMING_SETUP,
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/* MNCC server confirmed call setup with an MNCC_SETUP_COMPL_REQ */
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MNCC_CALL_EV_INCOMING_SETUP_COMPLETE,
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/* MNCC server requests call release (Rx MNCC_DISC_REQ) */
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MNCC_CALL_EV_CN_RELEASE,
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/* osmo-msc should request call release (Tx MNCC_DISC_IND) */
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MNCC_CALL_EV_MS_RELEASE,
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};
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/* The typical progression of outgoing and incoming calls via MNCC is shown by doc/sequence_charts/mncc_call_fsm.msc */
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enum mncc_call_fsm_state {
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MNCC_CALL_ST_NOT_STARTED = 0,
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MNCC_CALL_ST_OUTGOING_WAIT_PROCEEDING,
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MNCC_CALL_ST_OUTGOING_WAIT_COMPLETE,
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MNCC_CALL_ST_INCOMING_WAIT_COMPLETE,
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MNCC_CALL_ST_TALKING,
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MNCC_CALL_ST_WAIT_RELEASE_ACK,
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};
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struct mncc_call_incoming_req {
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bool bearer_cap_present;
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struct gsm_mncc_bearer_cap bearer_cap;
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bool cccap_present;
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struct gsm_mncc_cccap cccap;
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struct gsm_mncc setup_req_msg;
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};
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struct mncc_call;
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typedef void (* mncc_call_message_cb_t )(struct mncc_call *mncc_call, const union mncc_msg *mncc_msg, void *data);
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struct mncc_call {
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struct llist_head entry;
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struct osmo_fsm_inst *fi;
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struct vlr_subscr *vsub;
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struct gsm_network *net;
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/* Details originally passed to mncc_call_outgoing_start(), if any. */
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struct gsm_mncc outgoing_req;
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uint32_t callref;
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bool remote_msisdn_present;
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struct gsm_mncc_number remote_msisdn;
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bool local_msisdn_present;
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struct gsm_mncc_number local_msisdn;
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struct rtp_stream *rtps;
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bool received_rtp_create;
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mncc_call_message_cb_t message_cb;
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void *forward_cb_data;
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/* Event to dispatch to the FSM inst parent when the call is complete. Omit event dispatch when negative. See
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* mncc_call_alloc()'s arg of same name. */
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int parent_event_call_setup_complete;
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};
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void mncc_call_fsm_init(struct gsm_network *net);
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struct mncc_call *mncc_call_alloc(struct vlr_subscr *vsub,
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struct osmo_fsm_inst *parent,
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int parent_event_call_setup_complete,
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uint32_t parent_event_call_released,
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mncc_call_message_cb_t message_cb, void *forward_cb_data);
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void mncc_call_reparent(struct mncc_call *mncc_call,
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struct osmo_fsm_inst *new_parent,
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int parent_event_call_setup_complete,
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uint32_t parent_event_call_released,
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mncc_call_message_cb_t message_cb, void *forward_cb_data);
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int mncc_call_outgoing_start(struct mncc_call *mncc_call, const struct gsm_mncc *outgoing_req);
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int mncc_call_incoming_start(struct mncc_call *mncc_call, const struct mncc_call_incoming_req *incoming_req);
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int mncc_call_incoming_tx_setup_cnf(struct mncc_call *mncc_call, const struct gsm_mncc_number *connected_number);
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int mncc_call_set_rtp_stream(struct mncc_call *mncc_call, struct rtp_stream *rtps);
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void mncc_call_detach_rtp_stream(struct mncc_call *mncc_call);
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void mncc_call_rx(struct mncc_call *mncc_call, const union mncc_msg *mncc_msg);
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int mncc_call_tx(struct mncc_call *mncc_call, union mncc_msg *mncc_msg);
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int mncc_call_tx_msgt(struct mncc_call *mncc_call, uint32_t msg_type);
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struct mncc_call *mncc_call_find_by_callref(uint32_t callref);
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void mncc_call_release(struct mncc_call *mncc_call);
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uint32_t mgcp_codec_to_mncc_payload_msg_type(enum mgcp_codecs codec);
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