| /* Code to manage a subscriber's MSC-A role */ |
| /* |
| * (C) 2019 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de> |
| * All Rights Reserved |
| * |
| * SPDX-License-Identifier: AGPL-3.0+ |
| * |
| * Author: Neels Hofmeyr |
| * |
| * 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/>. |
| */ |
| |
| #include <osmocom/core/utils.h> |
| #include <osmocom/core/tdef.h> |
| #include <osmocom/core/rate_ctr.h> |
| #include <osmocom/core/signal.h> |
| |
| #include <osmocom/msc/gsm_data.h> |
| #include <osmocom/msc/msc_roles.h> |
| #include <osmocom/msc/msub.h> |
| #include <osmocom/msc/msc_a.h> |
| #include <osmocom/msc/msc_t.h> |
| #include <osmocom/msc/msc_i.h> |
| #include <osmocom/msc/paging.h> |
| #include <osmocom/msc/signal.h> |
| #include <osmocom/msc/vlr.h> |
| #include <osmocom/msc/transaction.h> |
| #include <osmocom/msc/ran_peer.h> |
| #include <osmocom/msc/ran_msg_a.h> |
| #include <osmocom/msc/ran_msg_iu.h> |
| #include <osmocom/msc/sgs_iface.h> |
| #include <osmocom/msc/gsm_04_08.h> |
| #include <osmocom/msc/gsm_09_11.h> |
| #include <osmocom/msc/gsm_04_14.h> |
| #include <osmocom/msc/call_leg.h> |
| #include <osmocom/msc/rtp_stream.h> |
| #include <osmocom/msc/msc_ho.h> |
| |
| #define MSC_A_USE_WAIT_CLEAR_COMPLETE "wait-Clear-Complete" |
| |
| static struct osmo_fsm msc_a_fsm; |
| |
| static const struct osmo_tdef_state_timeout msc_a_fsm_timeouts[32] = { |
| [MSC_A_ST_VALIDATE_L3] = { .T = -1 }, |
| [MSC_A_ST_AUTH_CIPH] = { .keep_timer = true }, |
| [MSC_A_ST_WAIT_CLASSMARK_UPDATE] = { .keep_timer = true }, |
| [MSC_A_ST_AUTHENTICATED] = { .keep_timer = true }, |
| [MSC_A_ST_RELEASING] = { .T = -2 }, |
| [MSC_A_ST_RELEASED] = { .T = -2 }, |
| }; |
| |
| /* Transition to a state, using the T timer defined in msc_a_fsm_timeouts. |
| * The actual timeout value is in turn obtained from network->T_defs. |
| * Assumes local variable fi exists. */ |
| #define msc_a_state_chg(msc_a, state) \ |
| osmo_tdef_fsm_inst_state_chg((msc_a)->c.fi, state, msc_a_fsm_timeouts, (msc_a)->c.ran->tdefs, 5) |
| |
| struct gsm_network *msc_a_net(const struct msc_a *msc_a) |
| { |
| return msub_net(msc_a->c.msub); |
| } |
| |
| struct vlr_subscr *msc_a_vsub(const struct msc_a *msc_a) |
| { |
| if (!msc_a) |
| return NULL; |
| return msub_vsub(msc_a->c.msub); |
| } |
| |
| struct msc_i *msc_a_msc_i(const struct msc_a *msc_a) |
| { |
| if (!msc_a) |
| return NULL; |
| return msub_msc_i(msc_a->c.msub); |
| } |
| |
| struct msc_t *msc_a_msc_t(const struct msc_a *msc_a) |
| { |
| if (!msc_a) |
| return NULL; |
| return msub_msc_t(msc_a->c.msub); |
| } |
| |
| struct msc_a *msc_a_fi_priv(struct osmo_fsm_inst *fi) |
| { |
| OSMO_ASSERT(fi); |
| OSMO_ASSERT(fi->fsm == &msc_a_fsm); |
| OSMO_ASSERT(fi->priv); |
| return fi->priv; |
| } |
| |
| static void update_counters(struct osmo_fsm_inst *fi, bool conn_accepted) |
| { |
| struct msc_a *msc_a = fi->priv; |
| struct gsm_network *net = msc_a_net(msc_a); |
| switch (msc_a->complete_layer3_type) { |
| case COMPLETE_LAYER3_LU: |
| rate_ctr_inc(&net->msc_ctrs->ctr[ |
| conn_accepted ? MSC_CTR_LOC_UPDATE_COMPLETED |
| : MSC_CTR_LOC_UPDATE_FAILED]); |
| break; |
| case COMPLETE_LAYER3_CM_SERVICE_REQ: |
| rate_ctr_inc(&net->msc_ctrs->ctr[ |
| conn_accepted ? MSC_CTR_CM_SERVICE_REQUEST_ACCEPTED |
| : MSC_CTR_CM_SERVICE_REQUEST_REJECTED]); |
| break; |
| case COMPLETE_LAYER3_PAGING_RESP: |
| rate_ctr_inc(&net->msc_ctrs->ctr[ |
| conn_accepted ? MSC_CTR_PAGING_RESP_ACCEPTED |
| : MSC_CTR_PAGING_RESP_REJECTED]); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static void evaluate_acceptance_outcome(struct osmo_fsm_inst *fi, bool conn_accepted) |
| { |
| struct msc_a *msc_a = fi->priv; |
| struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| |
| update_counters(fi, conn_accepted); |
| |
| /* Trigger transactions that we paged for */ |
| if (msc_a->complete_layer3_type == COMPLETE_LAYER3_PAGING_RESP) { |
| if (conn_accepted) |
| paging_response(msc_a); |
| else |
| paging_expired(vsub); |
| } |
| |
| if (conn_accepted) |
| osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_ATTACHED, msc_a_vsub(msc_a)); |
| |
| if (msc_a->complete_layer3_type == COMPLETE_LAYER3_LU) |
| msc_a_put(msc_a, MSC_A_USE_LOCATION_UPDATING); |
| } |
| |
| bool msc_a_is_accepted(const struct msc_a *msc_a) |
| { |
| if (!msc_a || !msc_a->c.fi) |
| return false; |
| return msc_a->c.fi->state == MSC_A_ST_AUTHENTICATED |
| || msc_a->c.fi->state == MSC_A_ST_COMMUNICATING; |
| } |
| |
| bool msc_a_in_release(struct msc_a *msc_a) |
| { |
| if (!msc_a) |
| return true; |
| if (msc_a->c.fi->state == MSC_A_ST_RELEASING) |
| return true; |
| if (msc_a->c.fi->state == MSC_A_ST_RELEASED) |
| return true; |
| return false; |
| } |
| |
| static int msc_a_ran_dec(struct msc_a *msc_a, const struct an_apdu *an_apdu, enum msc_role from_role) |
| { |
| int rc; |
| struct msc_a_ran_dec_data d = { |
| .from_role = from_role, |
| .an_apdu = an_apdu, |
| }; |
| msc_a_get(msc_a, __func__); |
| rc = msc_role_ran_decode(msc_a->c.fi, an_apdu, msc_a_ran_decode_cb, &d); |
| msc_a_put(msc_a, __func__); |
| return rc; |
| }; |
| |
| static void msc_a_fsm_validate_l3(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct msc_a *msc_a = fi->priv; |
| const struct an_apdu *an_apdu; |
| |
| switch (event) { |
| case MSC_A_EV_FROM_I_COMPLETE_LAYER_3: |
| case MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST: |
| case MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST: |
| an_apdu = data; |
| msc_a_ran_dec(msc_a, an_apdu, MSC_ROLE_I); |
| return; |
| |
| case MSC_A_EV_COMPLETE_LAYER_3_OK: |
| msc_a_state_chg(msc_a, MSC_A_ST_AUTH_CIPH); |
| return; |
| |
| case MSC_A_EV_MO_CLOSE: |
| case MSC_A_EV_CN_CLOSE: |
| evaluate_acceptance_outcome(fi, false); |
| /* fall through */ |
| case MSC_A_EV_UNUSED: |
| msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| return; |
| |
| default: |
| OSMO_ASSERT(false); |
| } |
| } |
| |
| /* Figure out whether to first send a Classmark Request to the MS to figure out algorithm support. */ |
| static bool msc_a_need_classmark_for_ciphering(struct msc_a *msc_a) |
| { |
| struct gsm_network *net = msc_a_net(msc_a); |
| struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| int i = 0; |
| bool request_classmark = false; |
| |
| /* Only on GERAN-A do we ever need Classmark Information for Ciphering. */ |
| if (msc_a->c.ran->type != OSMO_RAT_GERAN_A) |
| return false; |
| |
| for (i = 0; i < 8; i++) { |
| int supported; |
| |
| /* A5/n permitted by osmo-msc.cfg? */ |
| if (!(net->a5_encryption_mask & (1 << i))) |
| continue; |
| |
| /* A5/n supported by MS? */ |
| supported = osmo_gsm48_classmark_supports_a5(&vsub->classmark, i); |
| if (supported < 0) { |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "For A5/%d, we still need Classmark %d\n", i, -supported); |
| request_classmark = true; |
| } |
| } |
| |
| return request_classmark; |
| } |
| |
| static int msc_a_ran_enc_ciphering(struct msc_a *msc_a, bool umts_aka, bool retrieve_imeisv); |
| |
| /* VLR callback for ops.set_ciph_mode() */ |
| int msc_a_vlr_set_cipher_mode(void *_msc_a, bool umts_aka, bool retrieve_imeisv) |
| { |
| struct msc_a *msc_a = _msc_a; |
| struct vlr_subscr *vsub; |
| |
| if (!msc_a) { |
| LOGP(DMSC, LOGL_ERROR, "Insufficient info to start ciphering: " |
| "MSC-A role is NULL?!?\n"); |
| return -EINVAL; |
| } |
| |
| vsub = msc_a_vsub(msc_a); |
| if (!vsub || !vsub->last_tuple) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Insufficient info to start ciphering: " |
| "vlr_subscr is NULL?!?\n"); |
| return -EINVAL; |
| } |
| |
| if (msc_a_need_classmark_for_ciphering(msc_a)) { |
| int rc; |
| struct ran_msg msg = { |
| .msg_type = RAN_MSG_CLASSMARK_REQUEST, |
| }; |
| rc = msc_a_ran_down(msc_a, MSC_ROLE_I, &msg); |
| if (rc) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Cannot send Classmark Request\n"); |
| return -EIO; |
| } |
| |
| msc_a->state_before_classmark_update = msc_a->c.fi->state; |
| msc_a->action_on_classmark_update = (struct msc_a_action_on_classmark_update){ |
| .type = MSC_A_CLASSMARK_UPDATE_THEN_CIPHERING, |
| .ciphering = { |
| .umts_aka = umts_aka, |
| .retrieve_imeisv = retrieve_imeisv, |
| }, |
| }; |
| msc_a_state_chg(msc_a, MSC_A_ST_WAIT_CLASSMARK_UPDATE); |
| return 0; |
| } |
| |
| return msc_a_ran_enc_ciphering(msc_a, umts_aka, retrieve_imeisv); |
| } |
| |
| static int msc_a_ran_enc_ciphering(struct msc_a *msc_a, bool umts_aka, bool retrieve_imeisv) |
| { |
| struct gsm_network *net; |
| struct vlr_subscr *vsub; |
| struct ran_msg msg; |
| |
| if (!msc_a) { |
| LOGP(DMSC, LOGL_ERROR, "Insufficient info to start ciphering: " |
| "MSC-A role is NULL?!?\n"); |
| return -EINVAL; |
| } |
| |
| net = msc_a_net(msc_a); |
| vsub = msc_a_vsub(msc_a); |
| |
| if (!net || !vsub || !vsub->last_tuple) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Insufficient info to start ciphering: " |
| "gsm_network and/or vlr_subscr is NULL?!?\n"); |
| return -EINVAL; |
| } |
| |
| msg = (struct ran_msg){ |
| .msg_type = RAN_MSG_CIPHER_MODE_COMMAND, |
| .cipher_mode_command = { |
| .vec = vsub->last_tuple ? &vsub->last_tuple->vec : NULL, |
| .classmark = &vsub->classmark, |
| .geran = { |
| .umts_aka = umts_aka, |
| .retrieve_imeisv = retrieve_imeisv, |
| .a5_encryption_mask = net->a5_encryption_mask, |
| |
| /* for ran_a.c to store the GERAN key that is actually used */ |
| .chosen_key = &msc_a->geran_encr, |
| }, |
| }, |
| }; |
| |
| if (msc_a_ran_down(msc_a, MSC_ROLE_I, &msg)) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Sending Cipher Mode Command failed\n"); |
| /* Returning error to the VLR ops.set_ciph_mode() will cancel the attach. Other callers need to take |
| * care of the return value. */ |
| return -EINVAL; |
| } |
| |
| if (msc_a->geran_encr.key_len) |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "RAN encoding chose ciphering key %s\n", |
| osmo_hexdump_nospc(msc_a->geran_encr.key, msc_a->geran_encr.key_len)); |
| return 0; |
| } |
| |
| static void msc_a_fsm_auth_ciph(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct msc_a *msc_a = fi->priv; |
| |
| /* If accepted, transition the state, all other cases mean failure. */ |
| switch (event) { |
| case MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST: |
| case MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST: |
| msc_a_ran_dec(msc_a, data, MSC_ROLE_I); |
| return; |
| |
| case MSC_A_EV_AUTHENTICATED: |
| msc_a_state_chg(msc_a, MSC_A_ST_AUTHENTICATED); |
| return; |
| |
| case MSC_A_EV_UNUSED: |
| msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| return; |
| |
| case MSC_A_EV_MO_CLOSE: |
| case MSC_A_EV_CN_CLOSE: |
| evaluate_acceptance_outcome(fi, false); |
| msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| return; |
| |
| |
| default: |
| OSMO_ASSERT(false); |
| } |
| } |
| |
| static void msc_a_fsm_wait_classmark_update(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct msc_a *msc_a = fi->priv; |
| |
| switch (event) { |
| case MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST: |
| case MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST: |
| msc_a_ran_dec(msc_a, data, MSC_ROLE_I); |
| return; |
| |
| case MSC_A_EV_CLASSMARK_UPDATE: |
| switch (msc_a->action_on_classmark_update.type) { |
| case MSC_A_CLASSMARK_UPDATE_THEN_CIPHERING: |
| msc_a_state_chg(msc_a, MSC_A_ST_AUTH_CIPH); |
| if (msc_a_ran_enc_ciphering(msc_a, |
| msc_a->action_on_classmark_update.ciphering.umts_aka, |
| msc_a->action_on_classmark_update.ciphering.retrieve_imeisv)) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, |
| "After Classmark Update, still failed to send Cipher Mode Command\n"); |
| msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| } |
| return; |
| |
| default: |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Internal error: After Classmark Update, don't know what to do\n"); |
| msc_a_state_chg(msc_a, msc_a->state_before_classmark_update); |
| return; |
| } |
| |
| case MSC_A_EV_UNUSED: |
| /* Seems something detached / aborted in the middle of auth+ciph. */ |
| evaluate_acceptance_outcome(fi, false); |
| msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| return; |
| |
| case MSC_A_EV_MO_CLOSE: |
| case MSC_A_EV_CN_CLOSE: |
| evaluate_acceptance_outcome(fi, false); |
| msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| return; |
| |
| default: |
| OSMO_ASSERT(false); |
| } |
| } |
| |
| static bool msc_a_fsm_has_active_transactions(struct osmo_fsm_inst *fi) |
| { |
| struct msc_a *msc_a = fi->priv; |
| struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| struct gsm_trans *trans; |
| |
| if (osmo_use_count_by(&msc_a->use_count, MSC_A_USE_SILENT_CALL)) { |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "%s: silent call still active\n", __func__); |
| return true; |
| } |
| |
| if (osmo_use_count_by(&msc_a->use_count, MSC_A_USE_CM_SERVICE_CC)) { |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "%s: still awaiting MO CC request after a CM Service Request\n", |
| __func__); |
| return true; |
| } |
| if (osmo_use_count_by(&msc_a->use_count, MSC_A_USE_CM_SERVICE_SMS)) { |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "%s: still awaiting MO SMS after a CM Service Request\n", |
| __func__); |
| return true; |
| } |
| if (osmo_use_count_by(&msc_a->use_count, MSC_A_USE_CM_SERVICE_SS)) { |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "%s: still awaiting MO SS after a CM Service Request\n", |
| __func__); |
| return true; |
| } |
| |
| if (vsub && !llist_empty(&vsub->cs.requests)) { |
| struct paging_request *pr; |
| llist_for_each_entry(pr, &vsub->cs.requests, entry) { |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "%s: still active: %s\n", __func__, pr->label); |
| } |
| return true; |
| } |
| |
| if ((trans = trans_has_conn(msc_a))) { |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "connection still has active transaction: %s\n", |
| trans_type_name(trans->type)); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static void msc_a_fsm_authenticated_enter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| { |
| struct msc_a *msc_a = fi->priv; |
| struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| |
| /* Stop Location Update expiry for this subscriber. While the subscriber |
| * has an open connection the LU expiry timer must remain disabled. |
| * Otherwise we would kick the subscriber off the network when the timer |
| * expires e.g. during a long phone call. |
| * The LU expiry timer will restart once the connection is closed. */ |
| if (vsub) |
| vsub->expire_lu = VLR_SUBSCRIBER_NO_EXPIRATION; |
| |
| evaluate_acceptance_outcome(fi, true); |
| } |
| |
| static void msc_a_fsm_authenticated(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct msc_a *msc_a = fi->priv; |
| |
| switch (event) { |
| case MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST: |
| case MSC_A_EV_FROM_I_PREPARE_SUBSEQUENT_HANDOVER_REQUEST: |
| case MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST: |
| msc_a_ran_dec(msc_a, data, MSC_ROLE_I); |
| return; |
| |
| case MSC_A_EV_COMPLETE_LAYER_3_OK: |
| /* When Authentication is off, we may already be in the Accepted state when the code |
| * evaluates the Compl L3. Simply ignore. This just cosmetically mutes the error log |
| * about the useless event. */ |
| return; |
| |
| case MSC_A_EV_TRANSACTION_ACCEPTED: |
| msc_a_state_chg(msc_a, MSC_A_ST_COMMUNICATING); |
| return; |
| |
| case MSC_A_EV_MO_CLOSE: |
| case MSC_A_EV_CN_CLOSE: |
| case MSC_A_EV_UNUSED: |
| msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| return; |
| |
| default: |
| OSMO_ASSERT(false); |
| } |
| } |
| |
| /* The MGW has given us a local IP address for the RAN side. Ready to start the Assignment of a voice channel. */ |
| static void msc_a_call_leg_ran_local_addr_available(struct msc_a *msc_a) |
| { |
| struct ran_msg msg; |
| struct gsm_trans *cc_trans = msc_a->cc.active_trans; |
| struct gsm0808_channel_type channel_type; |
| |
| /* Once a CI is known, we could also CRCX the CN side of the MGW endpoint, but it makes sense to wait for the |
| * codec to be determined by the Assignment Complete message, first. */ |
| |
| if (mncc_bearer_cap_to_channel_type(&channel_type, &cc_trans->bearer_cap)) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Cannot compose Channel Type from bearer capabilities\n"); |
| /* FIXME: ERROR HANDLING */ |
| return; |
| } |
| |
| /* The RAN side RTP address is known, so the voice Assignment can commence. */ |
| msg = (struct ran_msg){ |
| .msg_type = RAN_MSG_ASSIGNMENT_COMMAND, |
| .assignment_command = { |
| .cn_rtp = &msc_a->cc.call_leg->rtp[RTP_TO_RAN]->local, |
| .channel_type = &channel_type, |
| .osmux_present = msc_a->cc.call_leg->rtp[RTP_TO_RAN]->use_osmux, |
| .osmux_cid = msc_a->cc.call_leg->rtp[RTP_TO_RAN]->local_osmux_cid, |
| }, |
| }; |
| if (msc_a_ran_down(msc_a, MSC_ROLE_I, &msg)) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Cannot send Assignment\n"); |
| /* FIXME: ERROR HANDLING */ |
| return; |
| } |
| } |
| |
| static void msc_a_call_leg_cn_local_addr_available(struct msc_a *msc_a, struct gsm_trans *cc_trans) |
| { |
| if (gsm48_tch_rtp_create(cc_trans)) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Cannot inform MNCC of RTP address\n"); |
| /* FIXME: ERROR HANDLING */ |
| return; |
| } |
| } |
| |
| static struct gsm_trans *find_waiting_call(struct msc_a *msc_a) |
| { |
| struct gsm_trans *trans; |
| struct gsm_network *net = msc_a_net(msc_a); |
| |
| llist_for_each_entry(trans, &net->trans_list, entry) { |
| if (trans->msc_a != msc_a) |
| continue; |
| if (trans->type != TRANS_CC) |
| continue; |
| if (trans->msc_a->cc.active_trans == trans) |
| continue; |
| return trans; |
| } |
| return NULL; |
| } |
| |
| static void msc_a_cleanup_rtp_streams(struct msc_a *msc_a, uint32_t event, void *data) |
| { |
| switch (event) { |
| |
| case MSC_EV_CALL_LEG_TERM: |
| msc_a->cc.call_leg = NULL; |
| if (msc_a->cc.mncc_forwarding_to_remote_ran) |
| msc_a->cc.mncc_forwarding_to_remote_ran->rtps = NULL; |
| |
| if (msc_a->ho.new_cell.mncc_forwarding_to_remote_ran) |
| msc_a->ho.new_cell.mncc_forwarding_to_remote_ran->rtps = NULL; |
| return; |
| |
| case MSC_MNCC_EV_CALL_ENDED: |
| msc_a->cc.mncc_forwarding_to_remote_ran = NULL; |
| return; |
| |
| default: |
| return; |
| } |
| } |
| |
| static void msc_a_fsm_communicating(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct msc_a *msc_a = fi->priv; |
| struct rtp_stream *rtps; |
| struct gsm_trans *waiting_trans; |
| struct an_apdu *an_apdu; |
| |
| msc_a_cleanup_rtp_streams(msc_a, event, data); |
| |
| switch (event) { |
| case MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST: |
| case MSC_A_EV_FROM_I_PREPARE_SUBSEQUENT_HANDOVER_REQUEST: |
| case MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST: |
| an_apdu = data; |
| msc_a_ran_dec(msc_a, an_apdu, MSC_ROLE_I); |
| return; |
| |
| case MSC_A_EV_FROM_T_PREPARE_HANDOVER_RESPONSE: |
| case MSC_A_EV_FROM_T_PREPARE_HANDOVER_FAILURE: |
| case MSC_A_EV_FROM_T_PROCESS_ACCESS_SIGNALLING_REQUEST: |
| case MSC_A_EV_FROM_T_SEND_END_SIGNAL_REQUEST: |
| an_apdu = data; |
| msc_a_ran_dec(msc_a, an_apdu, MSC_ROLE_T); |
| return; |
| |
| case MSC_A_EV_TRANSACTION_ACCEPTED: |
| /* no-op */ |
| return; |
| |
| case MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE: |
| rtps = data; |
| if (!rtps) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Invalid data for %s\n", osmo_fsm_event_name(fi->fsm, event)); |
| return; |
| } |
| LOG_MSC_A(msc_a, LOGL_DEBUG, |
| "MGW endpoint's RTP address available for the CI %s: " OSMO_SOCKADDR_STR_FMT " (osmux=%s:%d)\n", |
| rtp_direction_name(rtps->dir), OSMO_SOCKADDR_STR_FMT_ARGS(&rtps->local), |
| rtps->use_osmux ? "yes" : "no", rtps->local_osmux_cid); |
| switch (rtps->dir) { |
| case RTP_TO_RAN: |
| msc_a_call_leg_ran_local_addr_available(msc_a); |
| return; |
| case RTP_TO_CN: |
| msc_a_call_leg_cn_local_addr_available(msc_a, rtps->for_trans); |
| return; |
| default: |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Invalid data for %s\n", osmo_fsm_event_name(fi->fsm, event)); |
| return; |
| } |
| |
| case MSC_EV_CALL_LEG_RTP_COMPLETE: |
| /* Nothing to do. */ |
| return; |
| |
| case MSC_MNCC_EV_CALL_ENDED: |
| /* Cleaned up above */ |
| return; |
| |
| case MSC_EV_CALL_LEG_TERM: |
| /* RTP streams cleaned up above */ |
| |
| msc_a_get(msc_a, __func__); |
| if (msc_a->cc.active_trans) |
| trans_free(msc_a->cc.active_trans); |
| |
| /* If there is another call still waiting to be activated, this is the time when the mgcp_ctx is |
| * available again and the other call can start assigning. */ |
| waiting_trans = find_waiting_call(msc_a); |
| if (waiting_trans) { |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "(ti %02x) Call waiting: starting Assignment\n", |
| waiting_trans->transaction_id); |
| msc_a_try_call_assignment(waiting_trans); |
| } |
| msc_a_put(msc_a, __func__); |
| return; |
| |
| case MSC_A_EV_HANDOVER_REQUIRED: |
| msc_ho_start(msc_a, (struct ran_handover_required*)data); |
| return; |
| |
| case MSC_A_EV_HANDOVER_END: |
| /* Termination event of the msc_ho_fsm. No action needed, it's all done in the msc_ho_fsm cleanup. This |
| * event only exists because osmo_fsm_inst_alloc_child() requires a parent term event; and maybe |
| * interesting for logging. */ |
| return; |
| |
| case MSC_A_EV_MO_CLOSE: |
| case MSC_A_EV_CN_CLOSE: |
| case MSC_A_EV_UNUSED: |
| msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| return; |
| |
| default: |
| OSMO_ASSERT(false); |
| } |
| } |
| |
| static int msc_a_fsm_timer_cb(struct osmo_fsm_inst *fi) |
| { |
| struct msc_a *msc_a = fi->priv; |
| if (msc_a_in_release(msc_a)) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Timeout while releasing, discarding right now\n"); |
| msc_a_put_all(msc_a, MSC_A_USE_WAIT_CLEAR_COMPLETE); |
| msc_a_state_chg(msc_a, MSC_A_ST_RELEASED); |
| } else { |
| enum gsm48_reject_value cause = GSM48_REJECT_CONGESTION; |
| osmo_fsm_inst_dispatch(fi, MSC_A_EV_CN_CLOSE, &cause); |
| } |
| return 0; |
| } |
| |
| static void msc_a_fsm_releasing_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| { |
| struct msc_a *msc_a = fi->priv; |
| struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| int i; |
| char buf[128]; |
| const char * const use_counts_to_cancel[] = { |
| MSC_A_USE_LOCATION_UPDATING, |
| MSC_A_USE_CM_SERVICE_CC, |
| MSC_A_USE_CM_SERVICE_SMS, |
| MSC_A_USE_CM_SERVICE_SS, |
| MSC_A_USE_PAGING_RESPONSE, |
| }; |
| |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "Releasing: msc_a use is %s\n", |
| osmo_use_count_name_buf(buf, sizeof(buf), &msc_a->use_count)); |
| |
| if (vsub) { |
| vlr_subscr_get(vsub, __func__); |
| |
| /* Cancel all VLR FSMs, if any */ |
| vlr_subscr_cancel_attach_fsm(vsub, OSMO_FSM_TERM_ERROR, GSM48_REJECT_CONGESTION); |
| |
| /* The subscriber has no active connection anymore. |
| * Restart the periodic Location Update expiry timer for this subscriber. */ |
| vlr_subscr_enable_expire_lu(vsub); |
| } |
| |
| /* If we're closing in a middle of a trans, we need to clean up */ |
| trans_conn_closed(msc_a); |
| |
| call_leg_release(msc_a->cc.call_leg); |
| |
| /* Cancel use counts for pending CM Service / Paging */ |
| for (i = 0; i < ARRAY_SIZE(use_counts_to_cancel); i++) { |
| const char *use = use_counts_to_cancel[i]; |
| int32_t count = osmo_use_count_by(&msc_a->use_count, use); |
| if (!count) |
| continue; |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "Releasing: canceling still pending use: %s (%d)\n", use, count); |
| osmo_use_count_get_put(&msc_a->use_count, use, -count); |
| } |
| |
| if (msc_a->c.ran->type == OSMO_RAT_EUTRAN_SGS) { |
| sgs_iface_tx_release(vsub); |
| /* In SGsAP there is no confirmation of a release. */ |
| msc_a_state_chg(msc_a, MSC_A_ST_RELEASED); |
| } else { |
| struct ran_msg msg = { |
| .msg_type = RAN_MSG_CLEAR_COMMAND, |
| .clear_command = { |
| .csfb_ind = (vsub && vsub->sgs_fsm->state == SGS_UE_ST_ASSOCIATED), |
| }, |
| }; |
| msc_a_get(msc_a, MSC_A_USE_WAIT_CLEAR_COMPLETE); |
| msc_a_ran_down(msc_a, MSC_ROLE_I, &msg); |
| } |
| |
| if (vsub) |
| vlr_subscr_put(vsub, __func__); |
| } |
| |
| static void msc_a_fsm_releasing(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| struct msc_a *msc_a = fi->priv; |
| |
| msc_a_cleanup_rtp_streams(msc_a, event, data); |
| |
| switch (event) { |
| case MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST: |
| case MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST: |
| msc_a_ran_dec(msc_a, data, MSC_ROLE_I); |
| return; |
| |
| case MSC_A_EV_MO_CLOSE: |
| case MSC_A_EV_CN_CLOSE: |
| case MSC_A_EV_UNUSED: |
| /* Already releasing */ |
| return; |
| |
| case MSC_EV_CALL_LEG_TERM: |
| case MSC_MNCC_EV_CALL_ENDED: |
| /* RTP streams cleaned up above */ |
| return; |
| |
| case MSC_A_EV_HANDOVER_END: |
| /* msc_ho_fsm does cleanup. */ |
| return; |
| |
| default: |
| OSMO_ASSERT(false); |
| } |
| } |
| |
| |
| static void msc_a_fsm_released_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| { |
| struct msc_a *msc_a = msc_a_fi_priv(fi); |
| char buf[128]; |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "Released: msc_a use is %s\n", |
| osmo_use_count_name_buf(buf, sizeof(buf), &msc_a->use_count)); |
| if (osmo_use_count_total(&msc_a->use_count) == 0) |
| osmo_fsm_inst_term(fi, OSMO_FSM_TERM_REGULAR, fi); |
| } |
| |
| static void msc_a_fsm_released(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| if (event == MSC_A_EV_UNUSED) |
| osmo_fsm_inst_term(fi, OSMO_FSM_TERM_REGULAR, fi); |
| } |
| |
| void msc_a_fsm_allstate_action(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| //struct msc_a *a = msc_a_fi_priv(fi); |
| switch (event) { |
| |
| default: |
| return; |
| } |
| } |
| |
| void msc_a_fsm_cleanup(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause) |
| { |
| struct msc_a *msc_a = msc_a_fi_priv(fi); |
| |
| trans_conn_closed(msc_a); |
| |
| if (msc_a_fsm_has_active_transactions(fi)) |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Deallocating active transactions failed\n"); |
| |
| LOG_MSC_A_CAT(msc_a, DREF, LOGL_DEBUG, "max total use count was %d\n", msc_a->max_total_use_count); |
| } |
| |
| const struct value_string msc_a_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_A_EV_FROM_I_COMPLETE_LAYER_3), |
| OSMO_VALUE_STRING(MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST), |
| OSMO_VALUE_STRING(MSC_A_EV_FROM_I_PREPARE_SUBSEQUENT_HANDOVER_REQUEST), |
| OSMO_VALUE_STRING(MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST), |
| OSMO_VALUE_STRING(MSC_A_EV_FROM_T_PROCESS_ACCESS_SIGNALLING_REQUEST), |
| OSMO_VALUE_STRING(MSC_A_EV_FROM_T_PREPARE_HANDOVER_RESPONSE), |
| OSMO_VALUE_STRING(MSC_A_EV_FROM_T_PREPARE_HANDOVER_FAILURE), |
| OSMO_VALUE_STRING(MSC_A_EV_FROM_T_SEND_END_SIGNAL_REQUEST), |
| OSMO_VALUE_STRING(MSC_A_EV_COMPLETE_LAYER_3_OK), |
| OSMO_VALUE_STRING(MSC_A_EV_CLASSMARK_UPDATE), |
| OSMO_VALUE_STRING(MSC_A_EV_AUTHENTICATED), |
| OSMO_VALUE_STRING(MSC_A_EV_TRANSACTION_ACCEPTED), |
| OSMO_VALUE_STRING(MSC_A_EV_CN_CLOSE), |
| OSMO_VALUE_STRING(MSC_A_EV_MO_CLOSE), |
| OSMO_VALUE_STRING(MSC_A_EV_UNUSED), |
| OSMO_VALUE_STRING(MSC_A_EV_HANDOVER_REQUIRED), |
| OSMO_VALUE_STRING(MSC_A_EV_HANDOVER_END), |
| {} |
| }; |
| |
| #define S(x) (1 << (x)) |
| |
| static const struct osmo_fsm_state msc_a_fsm_states[] = { |
| [MSC_A_ST_VALIDATE_L3] = { |
| .name = OSMO_STRINGIFY(MSC_A_ST_VALIDATE_L3), |
| .in_event_mask = 0 |
| | S(MSC_A_EV_FROM_I_COMPLETE_LAYER_3) |
| | S(MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST) |
| | S(MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST) |
| | S(MSC_A_EV_COMPLETE_LAYER_3_OK) |
| | S(MSC_A_EV_MO_CLOSE) |
| | S(MSC_A_EV_CN_CLOSE) |
| | S(MSC_A_EV_UNUSED) |
| , |
| .out_state_mask = 0 |
| | S(MSC_A_ST_VALIDATE_L3) |
| | S(MSC_A_ST_AUTH_CIPH) |
| | S(MSC_A_ST_RELEASING) |
| , |
| .action = msc_a_fsm_validate_l3, |
| }, |
| [MSC_A_ST_AUTH_CIPH] = { |
| .name = OSMO_STRINGIFY(MSC_A_ST_AUTH_CIPH), |
| .in_event_mask = 0 |
| | S(MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST) |
| | S(MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST) |
| | S(MSC_A_EV_AUTHENTICATED) |
| | S(MSC_A_EV_MO_CLOSE) |
| | S(MSC_A_EV_CN_CLOSE) |
| | S(MSC_A_EV_UNUSED) |
| , |
| .out_state_mask = 0 |
| | S(MSC_A_ST_WAIT_CLASSMARK_UPDATE) |
| | S(MSC_A_ST_AUTHENTICATED) |
| | S(MSC_A_ST_RELEASING) |
| , |
| .action = msc_a_fsm_auth_ciph, |
| }, |
| [MSC_A_ST_WAIT_CLASSMARK_UPDATE] = { |
| .name = OSMO_STRINGIFY(MSC_A_ST_WAIT_CLASSMARK_UPDATE), |
| .in_event_mask = 0 |
| | S(MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST) |
| | S(MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST) |
| | S(MSC_A_EV_CLASSMARK_UPDATE) |
| | S(MSC_A_EV_MO_CLOSE) |
| | S(MSC_A_EV_CN_CLOSE) |
| , |
| .out_state_mask = 0 |
| | S(MSC_A_ST_AUTH_CIPH) |
| | S(MSC_A_ST_RELEASING) |
| , |
| .action = msc_a_fsm_wait_classmark_update, |
| }, |
| [MSC_A_ST_AUTHENTICATED] = { |
| .name = OSMO_STRINGIFY(MSC_A_ST_AUTHENTICATED), |
| /* allow everything to release for any odd behavior */ |
| .in_event_mask = 0 |
| | S(MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST) |
| | S(MSC_A_EV_FROM_I_PREPARE_SUBSEQUENT_HANDOVER_REQUEST) |
| | S(MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST) |
| | S(MSC_A_EV_TRANSACTION_ACCEPTED) |
| | S(MSC_A_EV_MO_CLOSE) |
| | S(MSC_A_EV_CN_CLOSE) |
| | S(MSC_A_EV_UNUSED) |
| , |
| .out_state_mask = 0 |
| | S(MSC_A_ST_RELEASING) |
| | S(MSC_A_ST_COMMUNICATING) |
| , |
| .onenter = msc_a_fsm_authenticated_enter, |
| .action = msc_a_fsm_authenticated, |
| }, |
| [MSC_A_ST_COMMUNICATING] = { |
| .name = OSMO_STRINGIFY(MSC_A_ST_COMMUNICATING), |
| /* allow everything to release for any odd behavior */ |
| .in_event_mask = 0 |
| | S(MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST) |
| | S(MSC_A_EV_FROM_I_PREPARE_SUBSEQUENT_HANDOVER_REQUEST) |
| | S(MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST) |
| | S(MSC_A_EV_FROM_T_PREPARE_HANDOVER_RESPONSE) |
| | S(MSC_A_EV_FROM_T_PREPARE_HANDOVER_FAILURE) |
| | S(MSC_A_EV_FROM_T_PROCESS_ACCESS_SIGNALLING_REQUEST) |
| | S(MSC_A_EV_FROM_T_SEND_END_SIGNAL_REQUEST) |
| | S(MSC_A_EV_TRANSACTION_ACCEPTED) |
| | S(MSC_A_EV_MO_CLOSE) |
| | S(MSC_A_EV_CN_CLOSE) |
| | S(MSC_A_EV_UNUSED) |
| | S(MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE) |
| | S(MSC_EV_CALL_LEG_RTP_COMPLETE) |
| | S(MSC_EV_CALL_LEG_TERM) |
| | S(MSC_MNCC_EV_CALL_ENDED) |
| | S(MSC_A_EV_HANDOVER_REQUIRED) |
| | S(MSC_A_EV_HANDOVER_END) |
| , |
| .out_state_mask = 0 |
| | S(MSC_A_ST_RELEASING) |
| , |
| .action = msc_a_fsm_communicating, |
| }, |
| [MSC_A_ST_RELEASING] = { |
| .name = OSMO_STRINGIFY(MSC_A_ST_RELEASING), |
| .in_event_mask = 0 |
| | S(MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST) |
| | S(MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST) |
| | S(MSC_A_EV_UNUSED) |
| | S(MSC_EV_CALL_LEG_TERM) |
| | S(MSC_MNCC_EV_CALL_ENDED) |
| | S(MSC_A_EV_HANDOVER_END) |
| , |
| .out_state_mask = 0 |
| | S(MSC_A_ST_RELEASED) |
| , |
| .onenter = msc_a_fsm_releasing_onenter, |
| .action = msc_a_fsm_releasing, |
| }, |
| [MSC_A_ST_RELEASED] = { |
| .name = OSMO_STRINGIFY(MSC_A_ST_RELEASED), |
| .in_event_mask = 0 |
| | S(MSC_A_EV_UNUSED) |
| , |
| .onenter = msc_a_fsm_released_onenter, |
| .action = msc_a_fsm_released, |
| }, |
| }; |
| |
| static struct osmo_fsm msc_a_fsm = { |
| .name = "msc_a", |
| .states = msc_a_fsm_states, |
| .num_states = ARRAY_SIZE(msc_a_fsm_states), |
| .log_subsys = DMSC, |
| .event_names = msc_a_fsm_event_names, |
| .allstate_action = msc_a_fsm_allstate_action, |
| .allstate_event_mask = 0 |
| , |
| .timer_cb = msc_a_fsm_timer_cb, |
| .cleanup = msc_a_fsm_cleanup, |
| }; |
| |
| static __attribute__((constructor)) void msc_a_fsm_init() |
| { |
| OSMO_ASSERT(osmo_fsm_register(&msc_a_fsm) == 0); |
| } |
| |
| static int msc_a_use_cb(struct osmo_use_count_entry *e, int32_t old_use_count, const char *file, int line) |
| { |
| struct msc_a *msc_a = e->use_count->talloc_object; |
| char buf[128]; |
| int32_t total; |
| int level; |
| |
| if (!e->use) |
| return -EINVAL; |
| |
| total = osmo_use_count_total(&msc_a->use_count); |
| |
| if (total == 0 |
| || (total == 1 && old_use_count == 0 && e->count == 1)) |
| level = LOGL_INFO; |
| else |
| level = LOGL_DEBUG; |
| |
| LOG_MSC_A_CAT_SRC(msc_a, DREF, level, file, line, "%s %s: now used by %s\n", |
| (e->count - old_use_count) > 0? "+" : "-", e->use, |
| osmo_use_count_name_buf(buf, sizeof(buf), &msc_a->use_count)); |
| |
| if (e->count < 0) |
| return -ERANGE; |
| |
| msc_a->max_total_use_count = OSMO_MAX(msc_a->max_total_use_count, total); |
| |
| if (total == 0) |
| osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_UNUSED, NULL); |
| return 0; |
| } |
| |
| struct msc_a *msc_a_alloc(struct msub *msub, struct ran_infra *ran) |
| { |
| struct msc_a *msc_a = msub_role_alloc(msub, MSC_ROLE_A, &msc_a_fsm, struct msc_a, ran); |
| msc_a->use_count = (struct osmo_use_count){ |
| .talloc_object = msc_a, |
| .use_cb = msc_a_use_cb, |
| }; |
| osmo_use_count_make_static_entries(&msc_a->use_count, msc_a->use_count_buf, ARRAY_SIZE(msc_a->use_count_buf)); |
| /* Start timeout for first state */ |
| msc_a_state_chg(msc_a, MSC_A_ST_VALIDATE_L3); |
| return msc_a; |
| } |
| |
| bool msc_a_is_establishing_auth_ciph(const struct msc_a *msc_a) |
| { |
| if (!msc_a || !msc_a->c.fi) |
| return false; |
| return msc_a->c.fi->state == MSC_A_ST_AUTH_CIPH; |
| } |
| |
| const struct value_string complete_layer3_type_names[] = { |
| { COMPLETE_LAYER3_NONE, "NONE" }, |
| { COMPLETE_LAYER3_LU, "LU" }, |
| { COMPLETE_LAYER3_CM_SERVICE_REQ, "CM_SERVICE_REQ" }, |
| { COMPLETE_LAYER3_PAGING_RESP, "PAGING_RESP" }, |
| { 0, NULL } |
| }; |
| |
| #define _msc_a_update_id(MSC_A, FMT, ARGS ...) \ |
| do { \ |
| if (osmo_fsm_inst_update_id_f(msc_a->c.fi, FMT ":%s:%s", \ |
| ## ARGS, \ |
| msub_ran_conn_name(msc_a->c.msub), \ |
| complete_layer3_type_name(msc_a->complete_layer3_type)) \ |
| == 0) { \ |
| struct vlr_subscr *_vsub = msc_a_vsub(MSC_A); \ |
| if (_vsub) { \ |
| if (_vsub->lu_fsm) \ |
| osmo_fsm_inst_update_id(_vsub->lu_fsm, (MSC_A)->c.fi->id); \ |
| if (_vsub->auth_fsm) \ |
| osmo_fsm_inst_update_id(_vsub->auth_fsm, (MSC_A)->c.fi->id); \ |
| if (_vsub->proc_arq_fsm) \ |
| osmo_fsm_inst_update_id(_vsub->proc_arq_fsm, (MSC_A)->c.fi->id); \ |
| } \ |
| LOG_MSC_A(MSC_A, LOGL_DEBUG, "Updated ID\n"); \ |
| } \ |
| /* otherwise osmo_fsm_inst_update_id_f() will log an error. */ \ |
| } while (0) |
| |
| |
| /* Compose an ID almost like gsm48_mi_to_string(), but print the MI type along, and print a TMSI as hex. */ |
| void msc_a_update_id_from_mi(struct msc_a *msc_a, const uint8_t mi[], uint8_t mi_len) |
| { |
| _msc_a_update_id(msc_a, "%s", osmo_mi_name(mi, mi_len)); |
| } |
| |
| /* Update msc_a->fi id string from current msc_a->vsub and msc_a->complete_layer3_type. */ |
| void msc_a_update_id(struct msc_a *msc_a) |
| { |
| _msc_a_update_id(msc_a, "%s", vlr_subscr_name(msc_a_vsub(msc_a))); |
| } |
| |
| /* Iterate all msc_a instances that are relevant for this subscriber, and update FSM ID strings for all of the FSM |
| * instances. */ |
| void msc_a_update_id_for_vsub(struct vlr_subscr *for_vsub) |
| { |
| struct msub *msub; |
| llist_for_each_entry(msub, &msub_list, entry) { |
| struct vlr_subscr *vsub = msub_vsub(msub); |
| if (vsub != for_vsub) |
| continue; |
| msc_a_update_id(msub_msc_a(msub)); |
| } |
| } |
| |
| static bool msg_is_initially_permitted(const struct gsm48_hdr *hdr) |
| { |
| uint8_t pdisc = gsm48_hdr_pdisc(hdr); |
| uint8_t msg_type = gsm48_hdr_msg_type(hdr); |
| |
| switch (pdisc) { |
| case GSM48_PDISC_MM: |
| switch (msg_type) { |
| case GSM48_MT_MM_LOC_UPD_REQUEST: |
| case GSM48_MT_MM_CM_SERV_REQ: |
| case GSM48_MT_MM_CM_REEST_REQ: |
| case GSM48_MT_MM_AUTH_RESP: |
| case GSM48_MT_MM_AUTH_FAIL: |
| case GSM48_MT_MM_ID_RESP: |
| case GSM48_MT_MM_TMSI_REALL_COMPL: |
| case GSM48_MT_MM_IMSI_DETACH_IND: |
| return true; |
| default: |
| break; |
| } |
| break; |
| case GSM48_PDISC_RR: |
| switch (msg_type) { |
| /* GSM48_MT_RR_CIPH_M_COMPL is actually handled in bssmap_rx_ciph_compl() and gets redirected in the |
| * BSSAP layer to ran_conn_cipher_mode_compl() (before this here is reached) */ |
| case GSM48_MT_RR_PAG_RESP: |
| case GSM48_MT_RR_CIPH_M_COMPL: |
| return true; |
| default: |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| |
| return false; |
| } |
| |
| /* Main entry point for GSM 04.08/44.008 Layer 3 data (e.g. from the BSC). */ |
| int msc_a_up_l3(struct msc_a *msc_a, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh; |
| uint8_t pdisc; |
| int rc; |
| struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| int is_r99; |
| |
| OSMO_ASSERT(msg->l3h); |
| OSMO_ASSERT(msg); |
| |
| gh = msgb_l3(msg); |
| pdisc = gsm48_hdr_pdisc(gh); |
| |
| LOG_MSC_A_CAT(msc_a, DRLL, LOGL_DEBUG, "Dispatching 04.08 message: %s %s\n", |
| gsm48_pdisc_name(pdisc), gsm48_pdisc_msgtype_name(pdisc, gsm48_hdr_msg_type(gh))); |
| |
| /* To evaluate the 3GPP TS 24.007 Duplicate Detection, we need Classmark information on whether the MS is R99 |
| * capable. If the subscriber is already actively connected, the Classmark information is stored with the |
| * vlr_subscr. Otherwise, this *must* be a Complete Layer 3 with Classmark info. */ |
| if (vsub) |
| is_r99 = osmo_gsm48_classmark_is_r99(&vsub->classmark) ? 1 : 0; |
| else |
| is_r99 = compl_l3_msg_is_r99(msg); |
| |
| if (is_r99 < 0) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, |
| "No Classmark Information, dropping non-Complete-Layer3 message: %s\n", |
| gsm48_pdisc_msgtype_name(pdisc, gsm48_hdr_msg_type(gh))); |
| return -EACCES; |
| } |
| |
| if (is_r99 >= 0 |
| && ran_dec_dtap_undup_is_duplicate(msc_a->c.fi, msc_a->n_sd_next, is_r99 ? true : false, msg)) { |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "Dropping duplicate message" |
| " (3GPP TS 24.007 11.2.3.2 Message Type Octet / Duplicate Detection)\n"); |
| return 0; |
| } |
| |
| if (!msc_a_is_accepted(msc_a) |
| && !msg_is_initially_permitted(gh)) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, |
| "Message not permitted for initial conn: %s\n", |
| gsm48_pdisc_msgtype_name(pdisc, gsm48_hdr_msg_type(gh))); |
| return -EACCES; |
| } |
| |
| if (vsub && vsub->cs.attached_via_ran != msc_a->c.ran->type) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, |
| "Illegal situation: RAN type mismatch:" |
| " attached via %s, received message via %s\n", |
| osmo_rat_type_name(vsub->cs.attached_via_ran), |
| osmo_rat_type_name(msc_a->c.ran->type)); |
| return -EACCES; |
| } |
| |
| #if 0 |
| if (silent_call_reroute(conn, msg)) |
| return silent_call_rx(conn, msg); |
| #endif |
| |
| switch (pdisc) { |
| case GSM48_PDISC_CC: |
| rc = gsm0408_rcv_cc(msc_a, msg); |
| break; |
| case GSM48_PDISC_MM: |
| rc = gsm0408_rcv_mm(msc_a, msg); |
| break; |
| case GSM48_PDISC_RR: |
| rc = gsm0408_rcv_rr(msc_a, msg); |
| break; |
| case GSM48_PDISC_SMS: |
| rc = gsm0411_rcv_sms(msc_a, msg); |
| break; |
| case GSM48_PDISC_MM_GPRS: |
| case GSM48_PDISC_SM_GPRS: |
| LOG_MSC_A_CAT(msc_a, DRLL, LOGL_NOTICE, "Unimplemented " |
| "GSM 04.08 discriminator 0x%02x\n", pdisc); |
| rc = -ENOTSUP; |
| break; |
| case GSM48_PDISC_NC_SS: |
| rc = gsm0911_rcv_nc_ss(msc_a, msg); |
| break; |
| case GSM48_PDISC_TEST: |
| rc = gsm0414_rcv_test(msc_a, msg); |
| break; |
| default: |
| LOG_MSC_A_CAT(msc_a, DRLL, LOGL_NOTICE, "Unknown " |
| "GSM 04.08 discriminator 0x%02x\n", pdisc); |
| rc = -EINVAL; |
| break; |
| } |
| |
| return rc; |
| } |
| |
| static void msc_a_up_call_assignment_complete(struct msc_a *msc_a, const struct ran_msg *ac) |
| { |
| struct gsm_trans *cc_trans = msc_a->cc.active_trans; |
| struct rtp_stream *rtps_to_ran = msc_a->cc.call_leg ? msc_a->cc.call_leg->rtp[RTP_TO_RAN] : NULL; |
| |
| if (!rtps_to_ran) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Rx Assignment Complete, but no RTP stream is set up\n"); |
| return; |
| } |
| if (!cc_trans) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Rx Assignment Complete, but CC transaction is active\n"); |
| return; |
| } |
| |
| if (rtps_to_ran->use_osmux != ac->assignment_complete.osmux_present) { |
| LOG_MSC_A_CAT(msc_a, DCC, LOGL_ERROR, "Osmux usage ass request and complete don't match: %d vs %d\n", |
| rtps_to_ran->use_osmux, ac->assignment_complete.osmux_present); |
| call_leg_release(msc_a->cc.call_leg); |
| return; |
| } |
| |
| /* Update RAN-side endpoint CI: */ |
| rtp_stream_set_codec(rtps_to_ran, ac->assignment_complete.codec); |
| rtp_stream_set_remote_addr(rtps_to_ran, &ac->assignment_complete.remote_rtp); |
| if (rtps_to_ran->use_osmux) |
| rtp_stream_set_remote_osmux_cid(rtps_to_ran, |
| ac->assignment_complete.osmux_cid); |
| |
| rtp_stream_commit(rtps_to_ran); |
| |
| /* Setup CN side endpoint CI: |
| * Now that |
| * - the first CI has been created and a definitive endpoint name is assigned to the call_leg's MGW |
| * endpoint, |
| * - the Assignment has chosen a speech codec |
| * go on to create the CN side RTP stream's CI. */ |
| if (call_leg_ensure_ci(msc_a->cc.call_leg, RTP_TO_CN, cc_trans->callref, cc_trans, |
| &ac->assignment_complete.codec, NULL)) { |
| LOG_MSC_A_CAT(msc_a, DCC, LOGL_ERROR, "Error creating MGW CI towards CN\n"); |
| call_leg_release(msc_a->cc.call_leg); |
| return; |
| } |
| } |
| |
| static void msc_a_up_call_assignment_failure(struct msc_a *msc_a, const struct ran_msg *af) |
| { |
| struct gsm_trans *trans; |
| |
| /* For a normal voice call, there will be an rtp_stream FSM. */ |
| if (msc_a->cc.call_leg && msc_a->cc.call_leg->rtp[RTP_TO_RAN]) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Assignment Failure, releasing call\n"); |
| rtp_stream_release(msc_a->cc.call_leg->rtp[RTP_TO_RAN]); |
| return; |
| } |
| |
| /* Otherwise, a silent call might be active */ |
| trans = trans_find_by_type(msc_a, TRANS_SILENT_CALL); |
| if (trans) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Assignment Failure, releasing silent call\n"); |
| trans_free(trans); |
| return; |
| } |
| |
| /* Neither a voice call nor silent call assignment. Assume the worst and detach. */ |
| msc_a_release_cn(msc_a); |
| } |
| |
| static void msc_a_up_classmark_update(struct msc_a *msc_a, const struct osmo_gsm48_classmark *classmark, |
| struct osmo_gsm48_classmark *dst) |
| { |
| if (!dst) { |
| struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| |
| if (!vsub) |
| dst = &msc_a->temporary_classmark; |
| else |
| dst = &vsub->classmark; |
| } |
| |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "A5 capabilities recived from Classmark Update: %s\n", |
| osmo_gsm48_classmark_a5_name(classmark)); |
| osmo_gsm48_classmark_update(dst, classmark); |
| |
| /* bump subscr conn FSM in case it is waiting for a Classmark Update */ |
| if (msc_a->c.fi->state == MSC_A_ST_WAIT_CLASSMARK_UPDATE) |
| osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_CLASSMARK_UPDATE, NULL); |
| } |
| |
| static void msc_a_up_sapi_n_reject(struct msc_a *msc_a, const struct ran_msg *msg) |
| { |
| int sapi = msg->sapi_n_reject.dlci & 0x7; |
| if (sapi == UM_SAPI_SMS) |
| gsm411_sapi_n_reject(msc_a); |
| } |
| |
| static int msc_a_up_ho(struct msc_a *msc_a, const struct msc_a_ran_dec_data *d, uint32_t ho_fi_event) |
| { |
| if (!msc_a->ho.fi) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Rx Handover message, but no Handover ongoing: %s\n", d->ran_dec->msg_name); |
| return -EINVAL; |
| } |
| return osmo_fsm_inst_dispatch(msc_a->ho.fi, ho_fi_event, (void*)d); |
| } |
| |
| int msc_a_ran_dec_from_msc_i(struct msc_a *msc_a, struct msc_a_ran_dec_data *d) |
| { |
| struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| const struct ran_msg *msg = d->ran_dec; |
| int rc = -99; |
| |
| switch (msg->msg_type) { |
| |
| case RAN_MSG_COMPL_L3: |
| msc_a->via_cell = (struct osmo_cell_global_id){ |
| .lai.plmn = msc_a_net(msc_a)->plmn, |
| }; |
| gsm0808_cell_id_to_cgi(&msc_a->via_cell, msg->compl_l3.cell_id); |
| rc = msc_a_up_l3(msc_a, msg->compl_l3.msg); |
| if (!rc) { |
| struct ran_conn *conn = msub_ran_conn(msc_a->c.msub); |
| if (conn) |
| ran_peer_cells_seen_add(conn->ran_peer, msg->compl_l3.cell_id); |
| } |
| break; |
| |
| case RAN_MSG_DTAP: |
| rc = msc_a_up_l3(msc_a, msg->dtap); |
| break; |
| |
| case RAN_MSG_CLEAR_REQUEST: |
| rc = osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_MO_CLOSE, NULL); |
| break; |
| |
| case RAN_MSG_CLEAR_COMPLETE: |
| switch (msc_a->c.fi->state) { |
| case MSC_A_ST_RELEASING: |
| msc_a_put_all(msc_a, MSC_A_USE_WAIT_CLEAR_COMPLETE); |
| msc_a_state_chg(msc_a, MSC_A_ST_RELEASED); |
| break; |
| case MSC_A_ST_RELEASED: |
| break; |
| default: |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Received Clear Complete event, but did not send Clear Command\n"); |
| msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| break; |
| } |
| rc = 0; |
| break; |
| |
| case RAN_MSG_CLASSMARK_UPDATE: |
| msc_a_up_classmark_update(msc_a, msg->classmark_update.classmark, NULL); |
| rc = 0; |
| break; |
| |
| case RAN_MSG_CIPHER_MODE_COMPLETE: |
| /* Remember what Ciphering was negotiated (e.g. for Handover) */ |
| if (msg->cipher_mode_complete.alg_id) { |
| msc_a->geran_encr.alg_id = msg->cipher_mode_complete.alg_id; |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "Cipher Mode Complete: chosen encryption algorithm: A5/%u\n", |
| msc_a->geran_encr.alg_id - 1); |
| }; |
| vlr_subscr_rx_ciph_res(vsub, VLR_CIPH_COMPL); |
| rc = 0; |
| break; |
| |
| case RAN_MSG_CIPHER_MODE_REJECT: |
| vlr_subscr_rx_ciph_res(vsub, VLR_CIPH_REJECT); |
| rc = 0; |
| break; |
| |
| case RAN_MSG_ASSIGNMENT_COMPLETE: |
| msc_a_up_call_assignment_complete(msc_a, msg); |
| rc = 0; |
| break; |
| |
| case RAN_MSG_ASSIGNMENT_FAILURE: |
| msc_a_up_call_assignment_failure(msc_a, msg); |
| rc = 0; |
| break; |
| |
| case RAN_MSG_SAPI_N_REJECT: |
| msc_a_up_sapi_n_reject(msc_a, msg); |
| rc = 0; |
| break; |
| |
| case RAN_MSG_HANDOVER_PERFORMED: |
| /* The BSS lets us know that a handover happened within the BSS, which doesn't concern us. */ |
| LOG_MSC_A(msc_a, LOGL_ERROR, "'Handover Performed' handling not implemented\n"); |
| break; |
| |
| case RAN_MSG_HANDOVER_REQUIRED: |
| /* The BSS lets us know that it wants to handover to a different cell */ |
| rc = osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_HANDOVER_REQUIRED, (void*)&msg->handover_required); |
| break; |
| |
| case RAN_MSG_HANDOVER_FAILURE: |
| rc = msc_a_up_ho(msc_a, d, MSC_HO_EV_RX_FAILURE); |
| break; |
| |
| default: |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Message from MSC-I not implemented: %s\n", ran_msg_type_name(msg->msg_type)); |
| rc = -ENOTSUP; |
| break; |
| } |
| return rc; |
| } |
| |
| static int msc_a_ran_dec_from_msc_t(struct msc_a *msc_a, struct msc_a_ran_dec_data *d) |
| { |
| struct msc_t *msc_t = msc_a_msc_t(msc_a); |
| int rc = -99; |
| |
| if (!msc_t) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Rx message from MSC-T role, but I have no active MSC-T role.\n"); |
| return -EINVAL; |
| } |
| |
| OSMO_ASSERT(d->ran_dec); |
| |
| switch (d->ran_dec->msg_type) { |
| |
| case RAN_MSG_CLEAR_REQUEST: |
| rc = osmo_fsm_inst_dispatch(msc_t->c.fi, MSC_T_EV_MO_CLOSE, NULL); |
| break; |
| |
| case RAN_MSG_CLEAR_COMPLETE: |
| rc = osmo_fsm_inst_dispatch(msc_t->c.fi, MSC_T_EV_CLEAR_COMPLETE, NULL); |
| break; |
| |
| case RAN_MSG_CLASSMARK_UPDATE: |
| msc_a_up_classmark_update(msc_a, d->ran_dec->classmark_update.classmark, &msc_t->classmark); |
| rc = 0; |
| break; |
| |
| case RAN_MSG_HANDOVER_REQUEST_ACK: |
| /* new BSS accepts Handover */ |
| rc = msc_a_up_ho(msc_a, d, MSC_HO_EV_RX_REQUEST_ACK); |
| break; |
| |
| case RAN_MSG_HANDOVER_DETECT: |
| /* new BSS signals the MS is DETECTed on the new lchan */ |
| rc = msc_a_up_ho(msc_a, d, MSC_HO_EV_RX_DETECT); |
| break; |
| |
| case RAN_MSG_HANDOVER_COMPLETE: |
| /* new BSS signals the MS has fully moved to the new lchan */ |
| rc = msc_a_up_ho(msc_a, d, MSC_HO_EV_RX_COMPLETE); |
| break; |
| |
| case RAN_MSG_HANDOVER_FAILURE: |
| rc = msc_a_up_ho(msc_a, d, MSC_HO_EV_RX_FAILURE); |
| break; |
| |
| default: |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Message from MSC-T not implemented: %s\n", |
| ran_msg_type_name(d->ran_dec->msg_type)); |
| rc = -ENOTSUP; |
| break; |
| } |
| return rc; |
| } |
| |
| int msc_a_ran_decode_cb(struct osmo_fsm_inst *msc_a_fi, void *data, const struct ran_msg *msg) |
| { |
| struct msc_a *msc_a = msc_a_fi_priv(msc_a_fi); |
| struct msc_a_ran_dec_data *d = data; |
| int rc = -99; |
| |
| d->ran_dec = msg; |
| |
| switch (d->from_role) { |
| case MSC_ROLE_I: |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "RAN decode: %s\n", msg->msg_name ? : ran_msg_type_name(msg->msg_type)); |
| rc = msc_a_ran_dec_from_msc_i(msc_a, d); |
| break; |
| |
| case MSC_ROLE_T: |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "RAN decode from MSC-T: %s\n", |
| msg->msg_name ? : ran_msg_type_name(msg->msg_type)); |
| rc = msc_a_ran_dec_from_msc_t(msc_a, d); |
| break; |
| |
| default: |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Message from invalid role %s: %s\n", msc_role_name(d->from_role), |
| ran_msg_type_name(msg->msg_type)); |
| return -ENOTSUP; |
| } |
| |
| if (rc) |
| LOG_MSC_A(msc_a, LOGL_ERROR, "RAN decode error (rc=%d) for %s from %s\n", rc, ran_msg_type_name(msg->msg_type), |
| msc_role_name(d->from_role)); |
| return rc; |
| } |
| |
| /* Your typical DTAP via FORWARD_ACCESS_SIGNALLING_REQUEST */ |
| int _msc_a_ran_down(struct msc_a *msc_a, enum msc_role to_role, const struct ran_msg *ran_msg, |
| const char *file, int line) |
| { |
| return _msc_a_msg_down(msc_a, to_role, msub_role_to_role_event(msc_a->c.msub, MSC_ROLE_A, to_role), |
| ran_msg, file, line); |
| } |
| |
| /* To transmit more complex events than just FORWARD_ACCESS_SIGNALLING_REQUEST, e.g. an |
| * MSC_T_EV_FROM_A_PREPARE_HANDOVER_REQUEST */ |
| int _msc_a_msg_down(struct msc_a *msc_a, enum msc_role to_role, uint32_t to_role_event, |
| const struct ran_msg *ran_msg, |
| const char *file, int line) |
| { |
| struct an_apdu an_apdu = { |
| .an_proto = msc_a->c.ran->an_proto, |
| .msg = msc_role_ran_encode(msc_a->c.fi, ran_msg), |
| }; |
| int rc; |
| if (!an_apdu.msg) |
| return -EIO; |
| rc = _msub_role_dispatch(msc_a->c.msub, to_role, to_role_event, &an_apdu, file, line); |
| msgb_free(an_apdu.msg); |
| return rc; |
| } |
| |
| int msc_a_tx_dtap_to_i(struct msc_a *msc_a, struct msgb *dtap) |
| { |
| struct ran_msg ran_msg; |
| |
| if (msc_a->c.ran->type == OSMO_RAT_EUTRAN_SGS) { |
| /* The SGs connection to the MME always is at the MSC-A. */ |
| return sgs_iface_tx_dtap_ud(msc_a, dtap); |
| } |
| |
| ran_msg = (struct ran_msg){ |
| .msg_type = RAN_MSG_DTAP, |
| .dtap = dtap, |
| }; |
| return msc_a_ran_down(msc_a, MSC_ROLE_I, &ran_msg); |
| } |
| |
| struct msc_a *msc_a_for_vsub(const struct vlr_subscr *vsub, bool valid_conn_only) |
| { |
| struct msc_a *msc_a = msub_msc_a(msub_for_vsub(vsub)); |
| if (valid_conn_only && !msc_a_is_accepted(msc_a)) |
| return NULL; |
| return msc_a; |
| } |
| |
| int msc_tx_common_id(struct msc_a *msc_a, enum msc_role to_role) |
| { |
| struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| struct ran_msg msg = { |
| .msg_type = RAN_MSG_COMMON_ID, |
| .common_id = { |
| .imsi = vsub->imsi, |
| }, |
| }; |
| |
| return msc_a_ran_down(msc_a, to_role, &msg); |
| } |
| |
| static int msc_a_start_assignment(struct msc_a *msc_a, struct gsm_trans *cc_trans) |
| { |
| struct call_leg *cl = msc_a->cc.call_leg; |
| struct msc_i *msc_i = msc_a_msc_i(msc_a); |
| struct gsm_network *net = msc_a_net(msc_a); |
| |
| OSMO_ASSERT(!msc_a->cc.active_trans); |
| msc_a->cc.active_trans = cc_trans; |
| |
| OSMO_ASSERT(cc_trans && cc_trans->type == TRANS_CC); |
| |
| if (!cl) { |
| cl = msc_a->cc.call_leg = call_leg_alloc(msc_a->c.fi, |
| MSC_EV_CALL_LEG_TERM, |
| MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE, |
| MSC_EV_CALL_LEG_RTP_COMPLETE); |
| OSMO_ASSERT(cl); |
| |
| /* HACK: We put the connection in loopback mode at the beginnig to |
| * trick the hNodeB into doing the IuUP negotiation with itself. |
| * This is a hack we need because osmo-mgw does not support IuUP yet, see OS#2459. */ |
| if (msc_a->c.ran->type == OSMO_RAT_UTRAN_IU) |
| cl->crcx_conn_mode[RTP_TO_RAN] = MGCP_CONN_LOOPBACK; |
| } |
| |
| if (net->use_osmux != OSMUX_USAGE_OFF) { |
| msc_i = msc_a_msc_i(msc_a); |
| if (msc_i->c.remote_to) { |
| /* TODO: investigate what to do in this case */ |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Osmux not yet supported for inter-MSC"); |
| } else { |
| cl->ran_peer_supports_osmux = msc_i->ran_conn->ran_peer->remote_supports_osmux; |
| } |
| } |
| |
| /* This will lead to either MSC_EV_CALL_LEG_LOCAL_ADDR_AVAILABLE or MSC_EV_CALL_LEG_TERM. |
| * If the local address is already known, then immediately trigger. */ |
| if (call_leg_local_ip(cl, RTP_TO_RAN)) |
| return osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE, cl->rtp[RTP_TO_RAN]); |
| else |
| return call_leg_ensure_ci(msc_a->cc.call_leg, RTP_TO_RAN, cc_trans->callref, cc_trans, NULL, NULL); |
| } |
| |
| int msc_a_try_call_assignment(struct gsm_trans *cc_trans) |
| { |
| struct msc_a *msc_a = cc_trans->msc_a; |
| OSMO_ASSERT(cc_trans->type == TRANS_CC); |
| |
| if (msc_a->cc.active_trans == cc_trans) { |
| /* Assignment for this trans already started earlier. */ |
| return 0; |
| } |
| |
| if (msc_a->cc.active_trans) { |
| LOG_MSC_A(msc_a, LOGL_INFO, "Another call is already ongoing, not assigning yet\n"); |
| return 0; |
| } |
| |
| LOG_MSC_A(msc_a, LOGL_DEBUG, "Starting call assignment\n"); |
| return msc_a_start_assignment(msc_a, cc_trans); |
| } |
| |
| const char *msc_a_cm_service_type_to_use(enum osmo_cm_service_type cm_service_type) |
| { |
| switch (cm_service_type) { |
| case GSM48_CMSERV_MO_CALL_PACKET: |
| case GSM48_CMSERV_EMERGENCY: |
| return MSC_A_USE_CM_SERVICE_CC; |
| |
| case GSM48_CMSERV_SMS: |
| return MSC_A_USE_CM_SERVICE_SMS; |
| |
| case GSM48_CMSERV_SUP_SERV: |
| return MSC_A_USE_CM_SERVICE_SS; |
| |
| default: |
| return NULL; |
| } |
| } |
| |
| void msc_a_release_cn(struct msc_a *msc_a) |
| { |
| osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_CN_CLOSE, NULL); |
| } |
| |
| void msc_a_release_mo(struct msc_a *msc_a, enum gsm48_gsm_cause gsm_cause) |
| { |
| osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_MO_CLOSE, NULL); |
| } |