956 lines
31 KiB
C
956 lines
31 KiB
C
/* The MSC-T role, a transitional RAN connection during Handover. */
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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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#include <inttypes.h>
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#include <osmocom/gsm/gsm48_ie.h>
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#include <osmocom/msc/msc_t.h>
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#include <osmocom/msc/msc_a.h>
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#include <osmocom/msc/msc_a_remote.h>
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#include <osmocom/msc/ran_infra.h>
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#include <osmocom/msc/ran_peer.h>
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#include <osmocom/msc/ran_conn.h>
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#include <osmocom/msc/msub.h>
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#include <osmocom/msc/call_leg.h>
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#include <osmocom/msc/rtp_stream.h>
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#include <osmocom/msc/ran_infra.h>
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#include <osmocom/msc/vlr.h>
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#include <osmocom/msc/msc_i.h>
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#include <osmocom/msc/gsm_data.h>
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static struct osmo_fsm msc_t_fsm;
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static struct msc_t *msc_t_find_by_handover_number(const char *handover_number)
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{
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struct msub *msub;
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llist_for_each_entry(msub, &msub_list, entry) {
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struct msc_t *msc_t = msub_msc_t(msub);
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if (!msc_t)
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continue;
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if (!*msc_t->inter_msc.handover_number)
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continue;
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if (strcmp(msc_t->inter_msc.handover_number, handover_number))
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continue;
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/* Found the assigned Handover Number */
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return msc_t;
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}
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return NULL;
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}
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static uint64_t net_handover_number_next(struct gsm_network *net)
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{
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uint64_t nr;
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if (net->handover_number.next < net->handover_number.range_start
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|| net->handover_number.next > net->handover_number.range_end)
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net->handover_number.next = net->handover_number.range_start;
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nr = net->handover_number.next;
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net->handover_number.next++;
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return nr;
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}
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static int msc_t_assign_handover_number(struct msc_t *msc_t)
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{
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int rc;
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uint64_t started_at;
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uint64_t ho_nr;
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char ho_nr_str[GSM23003_MSISDN_MAX_DIGITS+1];
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struct gsm_network *net = msc_t_net(msc_t);
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bool usable = false;
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started_at = ho_nr = net_handover_number_next(net);
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if (!ho_nr) {
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LOG_MSC_T(msc_t, LOGL_ERROR, "No Handover Number range defined in MSC config\n");
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return -ENOENT;
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}
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do {
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rc = snprintf(ho_nr_str, sizeof(ho_nr_str), "%"PRIu64, ho_nr);
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if (rc <= 0 || rc >= sizeof(ho_nr_str)) {
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LOG_MSC_T(msc_t, LOGL_ERROR, "Cannot compose Handover Number string (rc=%d)\n", rc);
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return -EINVAL;
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}
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if (!msc_t_find_by_handover_number(ho_nr_str)) {
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usable = true;
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break;
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}
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ho_nr = net_handover_number_next(net);
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} while(ho_nr != started_at);
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if (!usable) {
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LOG_MSC_T(msc_t, LOGL_ERROR, "No Handover Number available\n");
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return -EINVAL;
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}
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LOG_MSC_T(msc_t, LOGL_INFO, "Assigning Handover Number %s\n", ho_nr_str);
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OSMO_STRLCPY_ARRAY(msc_t->inter_msc.handover_number, ho_nr_str);
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return 0;
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}
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static struct msc_t *msc_t_priv(struct osmo_fsm_inst *fi)
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{
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OSMO_ASSERT(fi);
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OSMO_ASSERT(fi->fsm == &msc_t_fsm);
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OSMO_ASSERT(fi->priv);
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return fi->priv;
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}
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/* As a macro to log the caller's source file and line.
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* Assumes presence of local msc_t variable. */
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#define msc_t_error(fmt, args...) do { \
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msc_t->ho_success = false; \
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LOG_MSC_T(msc_t, LOGL_ERROR, fmt, ##args); \
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msc_t_clear(msc_t); \
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} while(0)
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static void msc_t_send_handover_failure(struct msc_t *msc_t, enum gsm0808_cause cause)
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{
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struct ran_msg ran_enc_msg = {
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.msg_type = RAN_MSG_HANDOVER_FAILURE,
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.handover_failure = {
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.cause = cause,
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},
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};
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struct an_apdu an_apdu = {
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.an_proto = msc_t->c.ran->an_proto,
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.msg = msc_role_ran_encode(msc_t->c.fi, &ran_enc_msg),
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};
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msc_t->ho_fail_sent = true;
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if (!an_apdu.msg)
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return;
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msub_role_dispatch(msc_t->c.msub, MSC_ROLE_A, MSC_A_EV_FROM_T_PREPARE_HANDOVER_FAILURE, &an_apdu);
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msgb_free(an_apdu.msg);
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}
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static int msc_t_ho_request_decode_and_store_cb(struct osmo_fsm_inst *msc_t_fi, void *data,
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const struct ran_msg *ran_dec)
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{
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struct msc_t *msc_t = msc_t_priv(msc_t_fi);
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if (ran_dec->msg_type != RAN_MSG_HANDOVER_REQUEST) {
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LOG_MSC_T(msc_t, LOGL_DEBUG, "Expected %s in incoming inter-MSC Handover message, got %s\n",
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ran_msg_type_name(RAN_MSG_HANDOVER_REQUEST), ran_msg_type_name(ran_dec->msg_type));
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return -EINVAL;
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}
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msc_t->inter_msc.cell_id_target = ran_dec->handover_request.cell_id_target;
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msc_t->inter_msc.callref = ran_dec->handover_request.call_id;
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/* TODO other parameters...?
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* Global Call Reference
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*/
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return 0;
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}
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/* On an icoming Handover Request from a remote MSC, we first need to set up an MGW endpoint, because the BSC needs to
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* know our AoIP Transport Layer Address in the Handover Request message (which obviously the remote MSC doesn't send,
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* it needs to be our local RTP address). Creating the MGW endpoint this is asynchronous, so we need to store the
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* Handover Request data to forward to the BSC once the MGW endpoint is known.
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*/
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static int msc_t_decode_and_store_ho_request(struct msc_t *msc_t, const struct an_apdu *an_apdu)
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{
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if (msc_role_ran_decode(msc_t->c.fi, an_apdu, msc_t_ho_request_decode_and_store_cb, NULL)) {
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msc_t_error("Failed to decode Handover Request\n");
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return -ENOTSUP;
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}
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/* Ok, decoding done, and above msc_t_ho_request_decode_and_store_cb() has retrieved what info we need at this
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* point and stored it in msc_t->inter_msc.* */
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/* We're storing this for use after async events, so need to make sure that each and every bit of data is copied
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* and no longer references some msgb that might be deallocated when this returns, nor remains in a local stack
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* variable of some ran_decode implementation. The simplest is to store the entire msgb. */
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msc_t->inter_msc.ho_request = (struct an_apdu) {
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.an_proto = an_apdu->an_proto,
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.msg = msgb_copy(an_apdu->msg, "saved inter-MSC Handover Request"),
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/* A decoded osmo_gsup_message often still references memory of within the msgb the GSUP was received
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* in. So, any info from an_apdu->e_info that would be needed would have to be copied separately.
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* Omit e_info completely. */
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};
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return 0;
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}
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/* On an incoming Handover Request from a remote MSC, the target cell was transmitted in the Handover Request message.
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* Find the RAN peer and assign from the cell id decoded above in msc_t_decode_and_store_ho_request(). */
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static int msc_t_find_ran_peer_from_ho_request(struct msc_t *msc_t)
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{
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struct msc_a *msc_a = msub_msc_a(msc_t->c.msub);
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const struct neighbor_ident_entry *nie;
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struct ran_peer *rp_from_neighbor_ident;
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struct ran_peer *rp;
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switch (msc_ho_find_target_cell(msc_a, &msc_t->inter_msc.cell_id_target,
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&nie, &rp_from_neighbor_ident, &rp)) {
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case MSC_NEIGHBOR_TYPE_REMOTE_MSC:
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msc_t_error("Incoming Handover Request indicated target cell that belongs to a remote MSC:"
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" Cell ID: %s; remote MSC: %s\n",
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gsm0808_cell_id_name(&msc_t->inter_msc.cell_id_target),
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neighbor_ident_addr_name(&nie->addr));
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return -EINVAL;
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case MSC_NEIGHBOR_TYPE_NONE:
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msc_t_error("Incoming Handover Request for unknown cell %s\n",
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gsm0808_cell_id_name(&msc_t->inter_msc.cell_id_target));
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return -EINVAL;
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case MSC_NEIGHBOR_TYPE_LOCAL_RAN_PEER:
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/* That's what is expected: a local RAN peer, e.g. BSC, or a remote BSC from neighbor cfg. */
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if (!rp)
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rp = rp_from_neighbor_ident;
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break;
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}
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OSMO_ASSERT(rp);
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LOG_MSC_T(msc_t, LOGL_DEBUG, "Incoming Handover Request indicates target cell %s,"
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" which belongs to RAN peer %s\n",
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gsm0808_cell_id_name(&msc_t->inter_msc.cell_id_target), rp->fi->id);
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/* Finally we know where to direct the Handover */
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msc_t_set_ran_peer(msc_t, rp);
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return 0;
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}
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static int msc_t_send_stored_ho_request__decode_cb(struct osmo_fsm_inst *msc_t_fi, void *data,
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const struct ran_msg *ran_dec)
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{
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int rc;
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struct an_apdu an_apdu;
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struct msc_t *msc_t = msc_t_priv(msc_t_fi);
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struct osmo_sockaddr_str *rtp_ran_local = data;
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/* Copy ran_dec message to un-const so we can add the AoIP Transport Layer Address. All pointer references still
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* remain on the same memory as ran_dec, which is fine. We're just going to encode it again right away. */
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struct ran_msg ran_enc = *ran_dec;
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if (ran_dec->msg_type != RAN_MSG_HANDOVER_REQUEST) {
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LOG_MSC_T(msc_t, LOGL_DEBUG, "Expected %s in incoming inter-MSC Handover message, got %s\n",
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ran_msg_type_name(RAN_MSG_HANDOVER_REQUEST), ran_msg_type_name(ran_dec->msg_type));
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return -EINVAL;
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}
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/* Insert AoIP Transport Layer Address */
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ran_enc.handover_request.rtp_ran_local = rtp_ran_local;
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/* Finally ready to forward to BSC: encode and send out. */
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an_apdu = (struct an_apdu){
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.an_proto = msc_t->inter_msc.ho_request.an_proto,
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.msg = msc_role_ran_encode(msc_t->c.fi, &ran_enc),
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};
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if (!an_apdu.msg)
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return -EIO;
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rc = msc_t_down_l2_co(msc_t, &an_apdu, true);
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msgb_free(an_apdu.msg);
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return rc;
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}
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/* The MGW endpoint is created, we know our AoIP Transport Layer Address and can send the Handover Request to the RAN
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* peer. */
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static int msc_t_send_stored_ho_request(struct msc_t *msc_t)
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{
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struct osmo_sockaddr_str *rtp_ran_local = call_leg_local_ip(msc_t->inter_msc.call_leg, RTP_TO_RAN);
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if (!rtp_ran_local) {
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msc_t_error("Local RTP address towards RAN is not set up properly, cannot send Handover Request\n");
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return -EINVAL;
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}
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/* The Handover Request received from the remote MSC is fed through, except we need to insert our local AoIP
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* Transport Layer Address, i.e. the RTP IP:port of the MGW towards the RAN side. So we actually need to decode,
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* add the AoIP and re-encode. By nature of decoding, it goes through the decode callback. */
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return msc_role_ran_decode(msc_t->c.fi, &msc_t->inter_msc.ho_request,
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msc_t_send_stored_ho_request__decode_cb, rtp_ran_local);
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}
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static void msc_t_fsm_pending_first_co_initial_msg(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct msc_t *msc_t = msc_t_priv(fi);
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struct msc_a *msc_a = msub_msc_a(msc_t->c.msub);
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struct an_apdu *an_apdu;
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OSMO_ASSERT(msc_a);
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switch (event) {
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case MSC_T_EV_FROM_A_PREPARE_HANDOVER_REQUEST:
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/* For an inter-MSC Handover coming in from a remote MSC, we do not yet know the RAN peer and AoIP
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* Transport Layer Address.
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* - RAN peer is found by decoding the actual Handover Request message and looking for the Cell
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* Identifier (Target).
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* - To be able to tell the BSC about an AoIP Transport Layer Address, we first need to create an MGW
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* endpoint.
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* For mere inter-BSC Handover, we know all of the above already. Find out which one this is.
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*/
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an_apdu = data;
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if (!msc_a->c.remote_to) {
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/* Inter-BSC */
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osmo_fsm_inst_state_chg(msc_t->c.fi, MSC_T_ST_WAIT_HO_REQUEST_ACK, 0, 0);
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/* Inter-BSC. All should be set up, just forward the message. */
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if (msc_t_down_l2_co(msc_t, an_apdu, true))
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msc_t_error("Failed to send AN-APDU to RAN peer\n");
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} else {
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/* Inter-MSC */
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if (msc_t->ran_conn) {
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msc_t_error("Unexpected state for inter-MSC Handover: RAN peer is already set up\n");
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return;
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}
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if (msc_t_decode_and_store_ho_request(msc_t, an_apdu))
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return;
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if (msc_t_find_ran_peer_from_ho_request(msc_t))
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return;
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/* Relying on timeout of the MGW operations, see onenter() for this state. */
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osmo_fsm_inst_state_chg(msc_t->c.fi, MSC_T_ST_WAIT_LOCAL_RTP, 0, 0);
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}
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return;
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case MSC_T_EV_CN_CLOSE:
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msc_t_clear(msc_t);
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return;
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default:
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OSMO_ASSERT(false);
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}
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}
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void msc_t_fsm_wait_local_rtp_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
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{
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struct msc_t *msc_t = msc_t_priv(fi);
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struct msc_a *msc_a = msub_msc_a(msc_t->c.msub);
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/* This only happens on inter-MSC HO incoming from a remote MSC */
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if (!msc_a->c.remote_to) {
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msc_t_error("Unexpected state: this is not an inter-MSC Handover\n");
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return;
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}
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if (msc_t->inter_msc.call_leg) {
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msc_t_error("Unexpected state: call leg already set up\n");
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return;
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}
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msc_t->inter_msc.call_leg = call_leg_alloc(msc_t->c.fi,
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MSC_EV_CALL_LEG_TERM,
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MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE,
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MSC_EV_CALL_LEG_RTP_COMPLETE);
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if (!msc_t->inter_msc.call_leg
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|| call_leg_ensure_ci(msc_t->inter_msc.call_leg, RTP_TO_RAN, msc_t->inter_msc.callref, NULL, NULL, NULL)
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|| call_leg_ensure_ci(msc_t->inter_msc.call_leg, RTP_TO_CN, msc_t->inter_msc.callref, NULL, NULL, NULL)) {
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msc_t_error("Failed to set up call leg\n");
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return;
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}
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/* Now wait for two MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE, one per RTP connection */
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}
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void msc_t_fsm_wait_local_rtp(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct msc_t *msc_t = msc_t_priv(fi);
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struct rtp_stream *rtps;
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switch (event) {
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case MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE:
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rtps = data;
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if (!rtps) {
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msc_t_error("Invalid data for MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE\n");
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return;
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}
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/* If both to-RAN and to-CN sides have a CI set up, we can continue. */
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if (!call_leg_local_ip(msc_t->inter_msc.call_leg, RTP_TO_RAN)
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|| !call_leg_local_ip(msc_t->inter_msc.call_leg, RTP_TO_CN))
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return;
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osmo_fsm_inst_state_chg(msc_t->c.fi, MSC_T_ST_WAIT_HO_REQUEST_ACK, 0, 0);
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msc_t_send_stored_ho_request(msc_t);
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return;
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case MSC_EV_CALL_LEG_TERM:
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msc_t->inter_msc.call_leg = NULL;
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msc_t_error("Failed to set up MGW endpoint\n");
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return;
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case MSC_MNCC_EV_CALL_ENDED:
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msc_t->inter_msc.mncc_forwarding_to_remote_cn = NULL;
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return;
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case MSC_T_EV_CN_CLOSE:
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case MSC_T_EV_MO_CLOSE:
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msc_t_clear(msc_t);
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return;
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default:
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OSMO_ASSERT(false);
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}
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}
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static int msc_t_patch_and_send_ho_request_ack(struct msc_t *msc_t, const struct an_apdu *incoming_an_apdu,
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const struct ran_msg *ran_dec)
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{
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int rc;
|
|
struct rtp_stream *rtp_ran = msc_t->inter_msc.call_leg? msc_t->inter_msc.call_leg->rtp[RTP_TO_RAN] : NULL;
|
|
struct rtp_stream *rtp_cn = msc_t->inter_msc.call_leg? msc_t->inter_msc.call_leg->rtp[RTP_TO_CN] : NULL;
|
|
/* Since it's BCD, it needs rounded-up half the char* length of an MSISDN plus a type byte.
|
|
* But no need to introduce obscure math to save a few stack bytes, just have more. */
|
|
uint8_t msisdn_enc_buf[GSM23003_MSISDN_MAX_DIGITS+1];
|
|
/* Copy an_apdu and an_apdu->e_info in "copy-on-write" method, because they are const and we
|
|
* need to add the Handover Number to e_info. */
|
|
const struct ran_handover_request_ack *r = &ran_dec->handover_request_ack;
|
|
struct ran_msg ran_enc = *ran_dec;
|
|
struct osmo_gsup_message e_info = {};
|
|
struct an_apdu an_apdu = {
|
|
.an_proto = incoming_an_apdu->an_proto,
|
|
.e_info = &e_info,
|
|
};
|
|
if (incoming_an_apdu->e_info)
|
|
e_info = *incoming_an_apdu->e_info;
|
|
|
|
rc = msc_t_assign_handover_number(msc_t);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = gsm48_encode_bcd_number(msisdn_enc_buf, sizeof(msisdn_enc_buf), 0,
|
|
msc_t->inter_msc.handover_number);
|
|
if (rc <= 0)
|
|
return -EINVAL;
|
|
|
|
e_info.msisdn_enc = msisdn_enc_buf;
|
|
e_info.msisdn_enc_len = rc;
|
|
|
|
/* Also need to fetch the RTP IP:port from AoIP Transport Address IE to tell the MGW about it */
|
|
if (rtp_ran) {
|
|
if (osmo_sockaddr_str_is_nonzero(&r->remote_rtp)) {
|
|
LOG_MSC_T(msc_t, LOGL_DEBUG, "From Handover Request Ack, got " OSMO_SOCKADDR_STR_FMT "\n",
|
|
OSMO_SOCKADDR_STR_FMT_ARGS(&r->remote_rtp));
|
|
rtp_stream_set_remote_addr(rtp_ran, &r->remote_rtp);
|
|
} else {
|
|
LOG_MSC_T(msc_t, LOGL_DEBUG, "No RTP IP:port in Handover Request Ack\n");
|
|
}
|
|
if (r->codec_present) {
|
|
LOG_MSC_T(msc_t, LOGL_DEBUG, "From Handover Request Ack, got %s\n",
|
|
osmo_mgcpc_codec_name(r->codec));
|
|
rtp_stream_set_codec(rtp_ran, r->codec);
|
|
if (rtp_cn)
|
|
rtp_stream_set_codec(rtp_cn, r->codec);
|
|
} else {
|
|
LOG_MSC_T(msc_t, LOGL_DEBUG, "No codec in Handover Request Ack\n");
|
|
}
|
|
rtp_stream_commit(rtp_ran);
|
|
} else {
|
|
LOG_MSC_T(msc_t, LOGL_DEBUG, "No RTP to RAN set up yet\n");
|
|
}
|
|
|
|
/* Remove that AoIP Transport Layer IE so it doesn't get sent to the remote MSC */
|
|
ran_enc.handover_request_ack.remote_rtp = (struct osmo_sockaddr_str){};
|
|
|
|
an_apdu.msg = msc_role_ran_encode(msc_t->c.fi, &ran_enc);
|
|
if (!an_apdu.msg)
|
|
return -EIO;
|
|
/* Send to remote MSC via msc_a_remote role */
|
|
rc = msub_role_dispatch(msc_t->c.msub, MSC_ROLE_A, MSC_A_EV_FROM_T_PREPARE_HANDOVER_RESPONSE, &an_apdu);
|
|
msgb_free(an_apdu.msg);
|
|
return rc;
|
|
}
|
|
|
|
static int msc_t_wait_ho_request_ack_decode_cb(struct osmo_fsm_inst *msc_t_fi, void *data,
|
|
const struct ran_msg *ran_dec)
|
|
{
|
|
int rc;
|
|
struct msc_t *msc_t = msc_t_priv(msc_t_fi);
|
|
struct msc_a *msc_a = msub_msc_a(msc_t->c.msub);
|
|
const struct an_apdu *an_apdu = data;
|
|
|
|
switch (ran_dec->msg_type) {
|
|
case RAN_MSG_HANDOVER_REQUEST_ACK:
|
|
if (msc_a->c.remote_to) {
|
|
/* inter-MSC. Add Handover Number, remove AoIP Transport Layer Address. */
|
|
rc = msc_t_patch_and_send_ho_request_ack(msc_t, an_apdu, ran_dec);
|
|
} else {
|
|
/* inter-BSC. Just send as-is, with correct event. */
|
|
rc = msub_role_dispatch(msc_t->c.msub, MSC_ROLE_A, MSC_A_EV_FROM_T_PREPARE_HANDOVER_RESPONSE,
|
|
an_apdu);
|
|
}
|
|
if (rc)
|
|
msc_t_error("Failed to send HO Request Ack\n");
|
|
else
|
|
osmo_fsm_inst_state_chg(msc_t->c.fi, MSC_T_ST_WAIT_HO_COMPLETE, 0, 0);
|
|
return 0;
|
|
|
|
case RAN_MSG_HANDOVER_FAILURE:
|
|
msub_role_dispatch(msc_t->c.msub, MSC_ROLE_A, MSC_A_EV_FROM_T_PREPARE_HANDOVER_FAILURE, an_apdu);
|
|
return 0;
|
|
|
|
case RAN_MSG_CLEAR_REQUEST:
|
|
msub_role_dispatch(msc_t->c.msub, MSC_ROLE_A, MSC_A_EV_FROM_T_PROCESS_ACCESS_SIGNALLING_REQUEST,
|
|
an_apdu);
|
|
return 0;
|
|
|
|
default:
|
|
LOG_MSC_T(msc_t, LOGL_ERROR, "Unexpected message during Prepare Handover procedure: %s\n",
|
|
ran_msg_type_name(ran_dec->msg_type));
|
|
/* Let's just forward anyway. */
|
|
msub_role_dispatch(msc_t->c.msub, MSC_ROLE_A, MSC_A_EV_FROM_T_PROCESS_ACCESS_SIGNALLING_REQUEST,
|
|
an_apdu);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static void msc_t_fsm_wait_ho_request_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data)
|
|
{
|
|
struct msc_t *msc_t = msc_t_priv(fi);
|
|
struct an_apdu *an_apdu;
|
|
|
|
switch (event) {
|
|
|
|
case MSC_EV_FROM_RAN_UP_L2:
|
|
an_apdu = data;
|
|
/* For inter-MSC Handover, we need to examine the message type. Depending on the response, we must
|
|
* dispatch MSC_A_EV_FROM_T_PREPARE_HANDOVER_RESPONSE or MSC_A_EV_FROM_T_PREPARE_HANDOVER_FAILURE, which
|
|
* ensures the correct E-interface message type. And we need to include the Handover Number.
|
|
* For mere inter-BSC Handover, we know that our osmo-msc internals don't care much about which event
|
|
* dispatches a Handover Failure or Handover Request Ack, so we could skip the decoding. But it is a
|
|
* premature optimization that complicates comparing an inter-BSC with an inter-MSC HO. */
|
|
msc_role_ran_decode(msc_t->c.fi, an_apdu, msc_t_wait_ho_request_ack_decode_cb, an_apdu);
|
|
/* Action continues in msc_t_wait_ho_request_ack_decode_cb() */
|
|
return;
|
|
|
|
case MSC_EV_FROM_RAN_CONN_RELEASED:
|
|
msc_t_clear(msc_t);
|
|
return;
|
|
|
|
case MSC_T_EV_FROM_A_FORWARD_ACCESS_SIGNALLING_REQUEST:
|
|
an_apdu = data;
|
|
msc_t_down_l2_co(msc_t, an_apdu, false);
|
|
return;
|
|
|
|
case MSC_EV_CALL_LEG_TERM:
|
|
msc_t->inter_msc.call_leg = NULL;
|
|
msc_t_error("Failed to set up MGW endpoint\n");
|
|
return;
|
|
|
|
case MSC_MNCC_EV_CALL_ENDED:
|
|
msc_t->inter_msc.mncc_forwarding_to_remote_cn = NULL;
|
|
return;
|
|
|
|
case MSC_T_EV_CN_CLOSE:
|
|
case MSC_T_EV_MO_CLOSE:
|
|
msc_t_clear(msc_t);
|
|
return;
|
|
|
|
default:
|
|
OSMO_ASSERT(false);
|
|
}
|
|
}
|
|
|
|
static int msc_t_wait_ho_complete_decode_cb(struct osmo_fsm_inst *msc_t_fi, void *data,
|
|
const struct ran_msg *ran_dec)
|
|
{
|
|
struct msc_t *msc_t = msc_t_priv(msc_t_fi);
|
|
struct msc_a *msc_a = msub_msc_a(msc_t->c.msub);
|
|
struct msc_i *msc_i;
|
|
const struct an_apdu *an_apdu = data;
|
|
|
|
switch (ran_dec->msg_type) {
|
|
case RAN_MSG_HANDOVER_COMPLETE:
|
|
msc_t->ho_success = true;
|
|
|
|
/* For both inter-BSC local to this MSC and inter-MSC Handover for a remote MSC-A, forward the Handover
|
|
* Complete message so that the MSC-A can change the MSC-T (transitional) to a proper MSC-I role. */
|
|
msub_role_dispatch(msc_t->c.msub, MSC_ROLE_A, MSC_A_EV_FROM_T_SEND_END_SIGNAL_REQUEST, an_apdu);
|
|
|
|
/* For inter-BSC Handover, the Handover Complete event has already cleaned up this msc_t, and it is
|
|
* already gone and deallocated. */
|
|
if (!msc_a->c.remote_to)
|
|
return 0;
|
|
|
|
/* For inter-MSC Handover, the remote MSC-A only turns its msc_t_remote into an msc_i_remote on
|
|
* the same GSUP link. We are here on the MSC-B side of the GSUP link and have to take care of
|
|
* creating an MSC-I over here to match the msc_i_remote at MSC-A. */
|
|
msc_i = msc_i_alloc(msc_t->c.msub, msc_t->c.ran);
|
|
if (!msc_i) {
|
|
msc_t_error("Failed to create MSC-I role\n");
|
|
return -1;
|
|
}
|
|
|
|
msc_i->inter_msc.mncc_forwarding_to_remote_cn = msc_t->inter_msc.mncc_forwarding_to_remote_cn;
|
|
mncc_call_reparent(msc_i->inter_msc.mncc_forwarding_to_remote_cn,
|
|
msc_i->c.fi, -1, MSC_MNCC_EV_CALL_ENDED, NULL, NULL);
|
|
|
|
msc_i->inter_msc.call_leg = msc_t->inter_msc.call_leg;
|
|
call_leg_reparent(msc_i->inter_msc.call_leg,
|
|
msc_i->c.fi,
|
|
MSC_EV_CALL_LEG_TERM,
|
|
MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE,
|
|
MSC_EV_CALL_LEG_RTP_COMPLETE);
|
|
|
|
/* msc_i_set_ran_conn() properly "steals" the ran_conn from msc_t */
|
|
msc_i_set_ran_conn(msc_i, msc_t->ran_conn);
|
|
|
|
/* Nicked everything worth keeping from MSC-T, discard now. */
|
|
msc_t_clear(msc_t);
|
|
return 0;
|
|
|
|
case RAN_MSG_HANDOVER_FAILURE:
|
|
msub_role_dispatch(msc_t->c.msub, MSC_ROLE_A, MSC_A_EV_FROM_T_PREPARE_HANDOVER_FAILURE, an_apdu);
|
|
return 0;
|
|
|
|
default:
|
|
LOG_MSC_T(msc_t, LOGL_ERROR, "Unexpected message during Prepare Handover procedure: %s\n",
|
|
ran_msg_type_name(ran_dec->msg_type));
|
|
/* Let's just forward anyway. Fall thru */
|
|
case RAN_MSG_HANDOVER_DETECT:
|
|
case RAN_MSG_CLEAR_REQUEST:
|
|
msub_role_dispatch(msc_t->c.msub, MSC_ROLE_A, MSC_A_EV_FROM_T_PROCESS_ACCESS_SIGNALLING_REQUEST,
|
|
an_apdu);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static void msc_t_fsm_wait_ho_complete(struct osmo_fsm_inst *fi, uint32_t event, void *data)
|
|
{
|
|
struct msc_t *msc_t = msc_t_priv(fi);
|
|
struct an_apdu *an_apdu;
|
|
|
|
switch (event) {
|
|
|
|
case MSC_EV_FROM_RAN_UP_L2:
|
|
an_apdu = data;
|
|
/* We need to catch the Handover Complete message in order to send it as a SendEndSignal Request */
|
|
msc_role_ran_decode(msc_t->c.fi, an_apdu, msc_t_wait_ho_complete_decode_cb, an_apdu);
|
|
return;
|
|
|
|
case MSC_EV_FROM_RAN_CONN_RELEASED:
|
|
msc_t_clear(msc_t);
|
|
return;
|
|
|
|
case MSC_T_EV_FROM_A_FORWARD_ACCESS_SIGNALLING_REQUEST:
|
|
an_apdu = data;
|
|
msc_t_down_l2_co(msc_t, an_apdu, false);
|
|
return;
|
|
|
|
case MSC_EV_CALL_LEG_TERM:
|
|
msc_t->inter_msc.call_leg = NULL;
|
|
msc_t_error("Failed to set up MGW endpoint\n");
|
|
return;
|
|
|
|
case MSC_MNCC_EV_CALL_ENDED:
|
|
msc_t->inter_msc.mncc_forwarding_to_remote_cn = NULL;
|
|
return;
|
|
|
|
case MSC_T_EV_CN_CLOSE:
|
|
case MSC_T_EV_MO_CLOSE:
|
|
msc_t_clear(msc_t);
|
|
return;
|
|
|
|
default:
|
|
OSMO_ASSERT(false);
|
|
}
|
|
}
|
|
|
|
void msc_t_mncc_cb(struct mncc_call *mncc_call, const union mncc_msg *mncc_msg, void *data)
|
|
{
|
|
struct msc_t *msc_t = data;
|
|
struct gsm_mncc_number nr = {
|
|
.plan = 1,
|
|
};
|
|
OSMO_STRLCPY_ARRAY(nr.number, msc_t->inter_msc.handover_number);
|
|
|
|
switch (mncc_msg->msg_type) {
|
|
case MNCC_RTP_CREATE:
|
|
mncc_call_incoming_tx_setup_cnf(mncc_call, &nr);
|
|
return;
|
|
default:
|
|
return;
|
|
}
|
|
}
|
|
|
|
struct mncc_call *msc_t_check_call_to_handover_number(const struct gsm_mncc *msg)
|
|
{
|
|
struct msc_t *msc_t;
|
|
const char *handover_number;
|
|
struct mncc_call_incoming_req req;
|
|
struct mncc_call *mncc_call;
|
|
|
|
if (!(msg->fields & MNCC_F_CALLED))
|
|
return NULL;
|
|
|
|
handover_number = msg->called.number;
|
|
msc_t = msc_t_find_by_handover_number(handover_number);
|
|
|
|
if (!msc_t)
|
|
return NULL;
|
|
|
|
if (msc_t->inter_msc.mncc_forwarding_to_remote_cn) {
|
|
LOG_MSC_T(msc_t, LOGL_ERROR, "Incoming call for inter-MSC call forwarding,"
|
|
" but this MSC-T role already has an MNCC FSM set up\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (!msc_t->inter_msc.call_leg
|
|
|| !msc_t->inter_msc.call_leg->rtp[RTP_TO_CN]) {
|
|
LOG_MSC_T(msc_t, LOGL_ERROR, "Incoming call for inter-MSC call forwarding,"
|
|
" but this MSC-T has no RTP stream ready for MNCC\n");
|
|
return NULL;
|
|
}
|
|
|
|
mncc_call = mncc_call_alloc(msc_t_vsub(msc_t),
|
|
msc_t->c.fi,
|
|
MSC_MNCC_EV_CALL_COMPLETE,
|
|
MSC_MNCC_EV_CALL_ENDED,
|
|
msc_t_mncc_cb, msc_t);
|
|
if (!mncc_call) {
|
|
LOG_MSC_T(msc_t, LOGL_ERROR, "Failed to set up call forwarding from remote MSC\n");
|
|
return NULL;
|
|
}
|
|
msc_t->inter_msc.mncc_forwarding_to_remote_cn = mncc_call;
|
|
|
|
if (mncc_call_set_rtp_stream(mncc_call, msc_t->inter_msc.call_leg->rtp[RTP_TO_CN])) {
|
|
LOG_MSC_T(msc_t, LOGL_ERROR, "Failed to set up call forwarding from remote MSC\n");
|
|
osmo_fsm_inst_term(mncc_call->fi, OSMO_FSM_TERM_REGULAR, NULL);
|
|
return NULL;
|
|
}
|
|
|
|
req = (struct mncc_call_incoming_req){
|
|
.setup_req_msg = *msg,
|
|
.bearer_cap_present = true,
|
|
.bearer_cap = {
|
|
/* TODO derive values from actual config */
|
|
/* FIXME are there no defines or enums for these numbers!? */
|
|
/* Table 10.5.102/3GPP TS 24.008: Bearer capability information element:
|
|
* octet 3 of bearer cap for speech says 3 = "1 1 dual rate support MS/full rate speech version
|
|
* 1 preferred, half rate speech version 1 also supported" */
|
|
.radio = 3,
|
|
/* Table 10.5.103/3GPP TS 24.008 Bearer capability information element:
|
|
* 0: FR1, 2: FR2, 4: FR3, 1: HR1, 5: HR3, actually in this order. -1 marks the end of the list. */
|
|
.speech_ver = { 0, 2, 4, 1, 5, -1 },
|
|
},
|
|
};
|
|
if (mncc_call_incoming_start(mncc_call, &req)) {
|
|
LOG_MSC_T(msc_t, LOGL_ERROR, "Failed to set up call forwarding from remote MSC\n");
|
|
osmo_fsm_inst_term(mncc_call->fi, OSMO_FSM_TERM_REGULAR, NULL);
|
|
return NULL;
|
|
}
|
|
return mncc_call;
|
|
}
|
|
|
|
static void msc_t_fsm_cleanup(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause)
|
|
{
|
|
struct msc_t *msc_t = msc_t_priv(fi);
|
|
|
|
if (!msc_t->ho_success && !msc_t->ho_fail_sent)
|
|
msc_t_send_handover_failure(msc_t, GSM0808_CAUSE_EQUIPMENT_FAILURE);
|
|
|
|
if (msc_t->ran_conn)
|
|
ran_conn_msc_role_gone(msc_t->ran_conn, msc_t->c.fi);
|
|
}
|
|
|
|
#define S(x) (1 << (x))
|
|
|
|
static const struct osmo_fsm_state msc_t_fsm_states[] = {
|
|
[MSC_T_ST_PENDING_FIRST_CO_INITIAL_MSG] = {
|
|
.name = "PENDING_FIRST_CO_INITIAL_MSG",
|
|
.action = msc_t_fsm_pending_first_co_initial_msg,
|
|
.in_event_mask = 0
|
|
| S(MSC_T_EV_FROM_A_PREPARE_HANDOVER_REQUEST)
|
|
| S(MSC_T_EV_CN_CLOSE)
|
|
,
|
|
.out_state_mask = 0
|
|
| S(MSC_T_ST_WAIT_LOCAL_RTP)
|
|
| S(MSC_T_ST_WAIT_HO_REQUEST_ACK)
|
|
,
|
|
},
|
|
[MSC_T_ST_WAIT_LOCAL_RTP] = {
|
|
.name = "WAIT_LOCAL_RTP",
|
|
.onenter = msc_t_fsm_wait_local_rtp_onenter,
|
|
.action = msc_t_fsm_wait_local_rtp,
|
|
.in_event_mask = 0
|
|
| S(MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE)
|
|
| S(MSC_EV_CALL_LEG_TERM)
|
|
| S(MSC_MNCC_EV_CALL_ENDED)
|
|
| S(MSC_T_EV_CN_CLOSE)
|
|
,
|
|
.out_state_mask = 0
|
|
| S(MSC_T_ST_WAIT_HO_REQUEST_ACK)
|
|
,
|
|
},
|
|
[MSC_T_ST_WAIT_HO_REQUEST_ACK] = {
|
|
.name = "WAIT_HO_REQUEST_ACK",
|
|
.action = msc_t_fsm_wait_ho_request_ack,
|
|
.in_event_mask = 0
|
|
| S(MSC_EV_FROM_RAN_UP_L2)
|
|
| S(MSC_EV_FROM_RAN_CONN_RELEASED)
|
|
| S(MSC_EV_CALL_LEG_TERM)
|
|
| S(MSC_MNCC_EV_CALL_ENDED)
|
|
| S(MSC_T_EV_FROM_A_FORWARD_ACCESS_SIGNALLING_REQUEST)
|
|
| S(MSC_T_EV_CN_CLOSE)
|
|
| S(MSC_T_EV_MO_CLOSE)
|
|
,
|
|
.out_state_mask = 0
|
|
| S(MSC_T_ST_WAIT_HO_COMPLETE)
|
|
,
|
|
},
|
|
[MSC_T_ST_WAIT_HO_COMPLETE] = {
|
|
.name = "WAIT_HO_COMPLETE",
|
|
.action = msc_t_fsm_wait_ho_complete,
|
|
.in_event_mask = 0
|
|
| S(MSC_EV_FROM_RAN_UP_L2)
|
|
| S(MSC_EV_FROM_RAN_CONN_RELEASED)
|
|
| S(MSC_EV_CALL_LEG_TERM)
|
|
| S(MSC_MNCC_EV_CALL_ENDED)
|
|
| S(MSC_T_EV_FROM_A_FORWARD_ACCESS_SIGNALLING_REQUEST)
|
|
| S(MSC_T_EV_CN_CLOSE)
|
|
| S(MSC_T_EV_MO_CLOSE)
|
|
,
|
|
},
|
|
};
|
|
|
|
const struct value_string msc_t_fsm_event_names[] = {
|
|
OSMO_VALUE_STRING(MSC_REMOTE_EV_RX_GSUP),
|
|
OSMO_VALUE_STRING(MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE),
|
|
OSMO_VALUE_STRING(MSC_EV_CALL_LEG_RTP_COMPLETE),
|
|
OSMO_VALUE_STRING(MSC_EV_CALL_LEG_TERM),
|
|
OSMO_VALUE_STRING(MSC_MNCC_EV_NEED_LOCAL_RTP),
|
|
OSMO_VALUE_STRING(MSC_MNCC_EV_CALL_PROCEEDING),
|
|
OSMO_VALUE_STRING(MSC_MNCC_EV_CALL_COMPLETE),
|
|
OSMO_VALUE_STRING(MSC_MNCC_EV_CALL_ENDED),
|
|
|
|
OSMO_VALUE_STRING(MSC_EV_FROM_RAN_COMPLETE_LAYER_3),
|
|
OSMO_VALUE_STRING(MSC_EV_FROM_RAN_UP_L2),
|
|
OSMO_VALUE_STRING(MSC_EV_FROM_RAN_CONN_RELEASED),
|
|
|
|
OSMO_VALUE_STRING(MSC_T_EV_FROM_A_PREPARE_HANDOVER_REQUEST),
|
|
OSMO_VALUE_STRING(MSC_T_EV_FROM_A_FORWARD_ACCESS_SIGNALLING_REQUEST),
|
|
OSMO_VALUE_STRING(MSC_T_EV_CN_CLOSE),
|
|
OSMO_VALUE_STRING(MSC_T_EV_MO_CLOSE),
|
|
OSMO_VALUE_STRING(MSC_T_EV_CLEAR_COMPLETE),
|
|
{}
|
|
};
|
|
|
|
static struct osmo_fsm msc_t_fsm = {
|
|
.name = "msc_t",
|
|
.states = msc_t_fsm_states,
|
|
.num_states = ARRAY_SIZE(msc_t_fsm_states),
|
|
.log_subsys = DMSC,
|
|
.event_names = msc_t_fsm_event_names,
|
|
.cleanup = msc_t_fsm_cleanup,
|
|
};
|
|
|
|
static __attribute__((constructor)) void msc_t_fsm_init(void)
|
|
{
|
|
OSMO_ASSERT(osmo_fsm_register(&msc_t_fsm) == 0);
|
|
}
|
|
|
|
/* Send connection-oriented L3 message to RAN peer (MSC->[BSC|RNC]) */
|
|
int msc_t_down_l2_co(struct msc_t *msc_t, const struct an_apdu *an_apdu, bool initial)
|
|
{
|
|
int rc;
|
|
if (!msc_t->ran_conn) {
|
|
LOG_MSC_T(msc_t, LOGL_ERROR, "Cannot Tx L2 message: no RAN conn\n");
|
|
return -EIO;
|
|
}
|
|
|
|
if (an_apdu->an_proto != msc_t->c.ran->an_proto) {
|
|
LOG_MSC_T(msc_t, LOGL_ERROR, "Mismatching AN-APDU proto: %s -- Dropping message\n",
|
|
an_proto_name(an_apdu->an_proto));
|
|
return -EIO;
|
|
}
|
|
|
|
rc = ran_conn_down_l2_co(msc_t->ran_conn, an_apdu->msg, initial);
|
|
if (rc)
|
|
LOG_MSC_T(msc_t, LOGL_ERROR, "Failed to transfer message down to new RAN peer (rc=%d)\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
struct gsm_network *msc_t_net(const struct msc_t *msc_t)
|
|
{
|
|
return msub_net(msc_t->c.msub);
|
|
}
|
|
|
|
struct vlr_subscr *msc_t_vsub(const struct msc_t *msc_t)
|
|
{
|
|
if (!msc_t)
|
|
return NULL;
|
|
return msub_vsub(msc_t->c.msub);
|
|
}
|
|
|
|
struct msc_t *msc_t_alloc_without_ran_peer(struct msub *msub, struct ran_infra *ran)
|
|
{
|
|
struct msc_t *msc_t;
|
|
|
|
msub_role_alloc(msub, MSC_ROLE_T, &msc_t_fsm, struct msc_t, ran);
|
|
msc_t = msub_msc_t(msub);
|
|
if (!msc_t)
|
|
return NULL;
|
|
|
|
return msc_t;
|
|
}
|
|
|
|
int msc_t_set_ran_peer(struct msc_t *msc_t, struct ran_peer *ran_peer)
|
|
{
|
|
if (!ran_peer || !ran_peer->sri || !ran_peer->sri->ran) {
|
|
LOG_MSC_T(msc_t, LOGL_ERROR, "Invalid RAN peer: %s\n", ran_peer ? ran_peer->fi->id : "NULL");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ran_peer->sri->ran != msc_t->c.ran) {
|
|
LOG_MSC_T(msc_t, LOGL_ERROR, "This MSC-T was set up for %s, cannot assign RAN peer for %s\n",
|
|
osmo_rat_type_name(msc_t->c.ran->type), osmo_rat_type_name(ran_peer->sri->ran->type));
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Create a new ran_conn with a fresh conn_id for the outgoing initial message. The msc_t FSM definition ensures
|
|
* that the first message sent or received is a Connection-Oriented Initial message. */
|
|
msc_t->ran_conn = ran_conn_create_outgoing(ran_peer);
|
|
if (!msc_t->ran_conn) {
|
|
LOG_MSC_T(msc_t, LOGL_ERROR, "Failed to create outgoing RAN conn\n");
|
|
return -EINVAL;
|
|
}
|
|
msc_t->ran_conn->msc_role = msc_t->c.fi;
|
|
msub_update_id(msc_t->c.msub);
|
|
return 0;
|
|
}
|
|
|
|
struct msc_t *msc_t_alloc(struct msub *msub, struct ran_peer *ran_peer)
|
|
{
|
|
struct msc_t *msc_t = msc_t_alloc_without_ran_peer(msub, ran_peer->sri->ran);
|
|
if (!msc_t)
|
|
return NULL;
|
|
if (msc_t_set_ran_peer(msc_t, ran_peer)) {
|
|
msc_t_clear(msc_t);
|
|
return NULL;
|
|
}
|
|
return msc_t;
|
|
}
|
|
|
|
void msc_t_clear(struct msc_t *msc_t)
|
|
{
|
|
if (!msc_t)
|
|
return;
|
|
osmo_fsm_inst_term(msc_t->c.fi, OSMO_FSM_TERM_REGULAR, msc_t->c.fi);
|
|
}
|