| /* GSM Mobile Radio Interface Layer 3 Call Control */ |
| |
| /* (C) 2008-2016 by Harald Welte <laforge@gnumonks.org> |
| * (C) 2008-2012 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Affero General Public License as published by |
| * the Free Software Foundation; either version 3 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU Affero General Public License for more details. |
| * |
| * You should have received a copy of the GNU Affero General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <stdbool.h> |
| #include <errno.h> |
| #include <time.h> |
| #include <netinet/in.h> |
| #include <regex.h> |
| #include <sys/types.h> |
| |
| #include <osmocom/mgcp_client/mgcp_client_endpoint_fsm.h> |
| |
| #include <osmocom/msc/db.h> |
| #include <osmocom/msc/debug.h> |
| #include <osmocom/msc/gsm_data.h> |
| #include <osmocom/msc/gsm_subscriber.h> |
| #include <osmocom/msc/gsm_04_11.h> |
| #include <osmocom/msc/gsm_04_08.h> |
| #include <osmocom/msc/gsm_04_80.h> |
| #include <osmocom/msc/gsm_04_14.h> |
| #include <osmocom/msc/gsm_09_11.h> |
| #include <osmocom/msc/signal.h> |
| #include <osmocom/msc/transaction.h> |
| #include <osmocom/msc/transaction_cc.h> |
| #include <osmocom/msc/silent_call.h> |
| #include <osmocom/msc/mncc_int.h> |
| #include <osmocom/abis/e1_input.h> |
| #include <osmocom/core/bitvec.h> |
| #include <osmocom/msc/vlr.h> |
| #include <osmocom/msc/msub.h> |
| #include <osmocom/msc/msc_a.h> |
| #include <osmocom/msc/paging.h> |
| #include <osmocom/msc/call_leg.h> |
| #include <osmocom/msc/rtp_stream.h> |
| #include <osmocom/msc/mncc_call.h> |
| #include <osmocom/msc/msc_t.h> |
| #include <osmocom/msc/sdp_msg.h> |
| #include <osmocom/msc/codec_mapping.h> |
| |
| #include <osmocom/gsm/gsm48.h> |
| #include <osmocom/gsm/gsm0480.h> |
| #include <osmocom/gsm/gsm_utils.h> |
| #include <osmocom/gsm/protocol/gsm_04_08.h> |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/core/utils.h> |
| #include <osmocom/core/byteswap.h> |
| #include <osmocom/gsm/tlv.h> |
| #include <osmocom/crypt/auth.h> |
| |
| #include <assert.h> |
| |
| static int gsm48_cc_tx_setup(struct gsm_trans *trans, void *arg); |
| static int gsm48_cc_tx_release(struct gsm_trans *trans, void *arg); |
| static int gsm48_cc_tx_disconnect(struct gsm_trans *trans, void *arg); |
| |
| static int trans_tx_gsm48(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->data; |
| gh->proto_discr = GSM48_PDISC_CC | (trans->transaction_id << 4); |
| OMSC_LINKID_CB(msg) = trans->dlci; |
| |
| return msc_a_tx_dtap_to_i(trans->msc_a, msg); |
| } |
| |
| uint32_t msc_cc_next_outgoing_callref() { |
| static uint32_t last_callref = 0x80000000; |
| last_callref++; |
| if (last_callref < 0x80000001) |
| last_callref = 0x80000001; |
| return last_callref; |
| } |
| |
| static void gsm48_cc_guard_timeout(void *arg) |
| { |
| struct gsm_trans *trans = arg; |
| LOG_TRANS(trans, LOGL_DEBUG, "guard timeout expired\n"); |
| trans_free(trans); |
| return; |
| } |
| |
| static void gsm48_stop_guard_timer(struct gsm_trans *trans) |
| { |
| if (osmo_timer_pending(&trans->cc.timer_guard)) { |
| LOG_TRANS(trans, LOGL_DEBUG, "stopping pending guard timer\n"); |
| osmo_timer_del(&trans->cc.timer_guard); |
| } |
| } |
| |
| static void gsm48_start_guard_timer(struct gsm_trans *trans) |
| { |
| /* NOTE: The purpose of this timer is to prevent the cc state machine |
| * from hanging in cases where mncc, gsm48 or both become unresponsive |
| * for some reason. The timer is started initially with the setup from |
| * the gsm48 side and then re-started with every incoming mncc message. |
| * Once the mncc state reaches its active state the timer is stopped. |
| * So if the cc state machine does not show any activity for an |
| * extended amount of time during call setup or teardown the guard |
| * timer will time out and hard-clear the connection. */ |
| if (osmo_timer_pending(&trans->cc.timer_guard)) |
| gsm48_stop_guard_timer(trans); |
| LOG_TRANS(trans, LOGL_DEBUG, "starting guard timer with %d seconds\n", trans->net->mncc_guard_timeout); |
| osmo_timer_setup(&trans->cc.timer_guard, gsm48_cc_guard_timeout, trans); |
| osmo_timer_schedule(&trans->cc.timer_guard, |
| trans->net->mncc_guard_timeout, 0); |
| } |
| |
| /* Call Control */ |
| |
| static void cc_tx_to_mncc(struct gsm_network *net, struct msgb *msg) |
| { |
| net->mncc_recv(net, msg); |
| } |
| |
| int gsm48_cc_tx_notify_ss(struct gsm_trans *trans, const char *message) |
| { |
| struct gsm48_hdr *gh; |
| struct msgb *ss_notify; |
| |
| ss_notify = gsm0480_create_notifySS(message); |
| if (!ss_notify) |
| return -1; |
| |
| gsm0480_wrap_invoke(ss_notify, GSM0480_OP_CODE_NOTIFY_SS, 0); |
| uint8_t *data = msgb_push(ss_notify, 1); |
| data[0] = ss_notify->len - 1; |
| gh = (struct gsm48_hdr *) msgb_push(ss_notify, sizeof(*gh)); |
| gh->msg_type = GSM48_MT_CC_FACILITY; |
| return trans_tx_gsm48(trans, ss_notify); |
| } |
| |
| /* FIXME: this count_statistics is a state machine behaviour. we should convert |
| * the complete call control into a state machine. Afterwards we can move this |
| * code into state transitions. |
| */ |
| static void count_statistics(struct gsm_trans *trans, int new_state) |
| { |
| int old_state = trans->cc.state; |
| struct rate_ctr_group *msc = trans->net->msc_ctrs; |
| |
| if (old_state == new_state) |
| return; |
| |
| /* state incoming */ |
| switch (new_state) { |
| case GSM_CSTATE_ACTIVE: |
| osmo_stat_item_inc(osmo_stat_item_group_get_item(trans->net->statg, MSC_STAT_ACTIVE_CALLS), |
| 1); |
| rate_ctr_inc(rate_ctr_group_get_ctr(msc, MSC_CTR_CALL_ACTIVE)); |
| break; |
| } |
| |
| /* state outgoing */ |
| switch (old_state) { |
| case GSM_CSTATE_ACTIVE: |
| osmo_stat_item_dec(osmo_stat_item_group_get_item(trans->net->statg, MSC_STAT_ACTIVE_CALLS), |
| 1); |
| if (new_state == GSM_CSTATE_DISCONNECT_REQ || |
| new_state == GSM_CSTATE_DISCONNECT_IND) |
| rate_ctr_inc(rate_ctr_group_get_ctr(msc, MSC_CTR_CALL_COMPLETE)); |
| else |
| rate_ctr_inc(rate_ctr_group_get_ctr(msc, MSC_CTR_CALL_INCOMPLETE)); |
| break; |
| } |
| } |
| |
| static void new_cc_state(struct gsm_trans *trans, int state) |
| { |
| if (state > 31 || state < 0) |
| return; |
| |
| LOG_TRANS(trans, LOGL_DEBUG, "new state %s -> %s\n", |
| gsm48_cc_state_name(trans->cc.state), |
| gsm48_cc_state_name(state)); |
| |
| count_statistics(trans, state); |
| trans->cc.state = state; |
| |
| /* Stop the guard timer when a call reaches the active state */ |
| if (state == GSM_CSTATE_ACTIVE) |
| gsm48_stop_guard_timer(trans); |
| } |
| |
| static int gsm48_cc_tx_status(struct gsm_trans *trans, void *arg) |
| { |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC STATUS"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| uint8_t *cause, *call_state; |
| |
| gh->msg_type = GSM48_MT_CC_STATUS; |
| |
| cause = msgb_put(msg, 3); |
| cause[0] = 2; |
| cause[1] = GSM48_CAUSE_CS_GSM | GSM48_CAUSE_LOC_USER; |
| cause[2] = 0x80 | 30; /* response to status inquiry */ |
| |
| call_state = msgb_put(msg, 1); |
| call_state[0] = 0xc0 | 0x00; |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static void gsm48_stop_cc_timer(struct gsm_trans *trans) |
| { |
| if (osmo_timer_pending(&trans->cc.timer)) { |
| LOG_TRANS(trans, LOGL_DEBUG, "stopping pending timer T%x\n", trans->cc.Tcurrent); |
| osmo_timer_del(&trans->cc.timer); |
| trans->cc.Tcurrent = 0; |
| } |
| } |
| |
| /* Log the MNCC tx and rx events. |
| * Depending on msg_type, also log whether RTP information is passed on. |
| * (This is particularly interesting for the doc/sequence_charts/msc_log_to_ladder.py) |
| */ |
| #define log_mncc_rx_tx(ARGS...) _log_mncc_rx_tx(__FILE__, __LINE__, ##ARGS) |
| static void _log_mncc_rx_tx(const char *file, int line, |
| struct gsm_trans *trans, const char *rx_tx, const union mncc_msg *mncc) |
| { |
| const char *sdp = NULL; |
| struct sdp_msg sdp_msg = {}; |
| struct osmo_sockaddr addr = {}; |
| |
| if (!log_check_level(DMNCC, LOGL_DEBUG)) |
| return; |
| |
| switch (mncc->msg_type) { |
| case MNCC_RTP_CREATE: |
| case MNCC_RTP_CONNECT: |
| addr = (struct osmo_sockaddr){ .u.sas = mncc->rtp.addr }; |
| sdp = mncc->rtp.sdp; |
| break; |
| |
| case MNCC_SETUP_IND: |
| case MNCC_SETUP_REQ: |
| case MNCC_SETUP_COMPL_IND: |
| case MNCC_SETUP_COMPL_REQ: |
| case MNCC_SETUP_RSP: |
| case MNCC_SETUP_CNF: |
| case MNCC_CALL_CONF_IND: |
| case MNCC_CALL_PROC_REQ: |
| case MNCC_ALERT_IND: |
| case MNCC_ALERT_REQ: |
| sdp = mncc->signal.sdp; |
| break; |
| |
| default: |
| break; |
| } |
| |
| if (sdp && sdp[0]) { |
| int rc = sdp_msg_from_sdp_str(&sdp_msg, sdp); |
| if (rc != 0) { |
| LOG_TRANS_CAT_SRC(trans, DMNCC, LOGL_ERROR, file, line, "%s %s: invalid SDP message (trying anyway)\n", |
| rx_tx, |
| get_mncc_name(mncc->msg_type)); |
| LOG_TRANS_CAT_SRC(trans, DMNCC, LOGL_DEBUG, file, line, "erratic SDP: %s\n", |
| osmo_quote_cstr_c(OTC_SELECT, sdp, -1)); |
| return; |
| } |
| LOG_TRANS_CAT_SRC(trans, DMNCC, LOGL_DEBUG, file, line, "%s %s (RTP=%s)\n", |
| rx_tx, |
| get_mncc_name(mncc->msg_type), |
| sdp_msg_to_str(&sdp_msg)); |
| return; |
| } |
| |
| if (osmo_sockaddr_is_any(&addr) == 0) { |
| LOG_TRANS_CAT_SRC(trans, DMNCC, LOGL_DEBUG, file, line, "%s %s (RTP=%s)\n", |
| rx_tx, |
| get_mncc_name(mncc->msg_type), |
| osmo_sockaddr_to_str_c(OTC_SELECT, &addr)); |
| return; |
| } |
| |
| LOG_TRANS_CAT_SRC(trans, DMNCC, LOGL_DEBUG, file, line, "%s %s\n", rx_tx, get_mncc_name(mncc->msg_type)); |
| } |
| |
| #define mncc_recvmsg(ARGS...) _mncc_recvmsg(__FILE__, __LINE__, ##ARGS) |
| static int _mncc_recvmsg(const char *file, int line, |
| struct gsm_network *net, struct gsm_trans *trans, int msg_type, struct gsm_mncc *mncc) |
| { |
| struct msgb *msg; |
| unsigned char *data; |
| |
| mncc->msg_type = msg_type; |
| log_mncc_rx_tx(trans, "tx", (union mncc_msg *)mncc); |
| |
| msg = msgb_alloc(sizeof(struct gsm_mncc), "MNCC"); |
| if (!msg) |
| return -ENOMEM; |
| |
| data = msgb_put(msg, sizeof(struct gsm_mncc)); |
| memcpy(data, mncc, sizeof(struct gsm_mncc)); |
| |
| cc_tx_to_mncc(net, msg); |
| /* trans may be NULL when sending an MNCC error reply upon an invalid MNCC request */ |
| if (trans) |
| trans->cc.mncc_initiated = true; |
| |
| return 0; |
| } |
| |
| int mncc_release_ind(struct gsm_network *net, struct gsm_trans *trans, |
| uint32_t callref, int location, int value) |
| { |
| struct gsm_mncc rel; |
| |
| memset(&rel, 0, sizeof(rel)); |
| rel.callref = callref; |
| mncc_set_cause(&rel, location, value); |
| if (trans && trans->cc.state == GSM_CSTATE_RELEASE_REQ) |
| return mncc_recvmsg(net, trans, MNCC_REL_CNF, &rel); |
| return mncc_recvmsg(net, trans, MNCC_REL_IND, &rel); |
| } |
| |
| /* Call Control Specific transaction release. |
| * gets called by trans_free, DO NOT CALL YOURSELF! */ |
| void _gsm48_cc_trans_free(struct gsm_trans *trans) |
| { |
| gsm48_stop_cc_timer(trans); |
| |
| /* send release to L4, if callref still exists */ |
| if (trans->callref) { |
| /* Send MNCC REL.ind (cause='Resource unavailable') */ |
| if (trans->cc.mncc_initiated) { |
| mncc_release_ind(trans->net, trans, trans->callref, |
| GSM48_CAUSE_LOC_PRN_S_LU, |
| (trans->cc.state == GSM_CSTATE_CALL_RECEIVED) ? |
| GSM48_CC_CAUSE_USER_NOTRESPOND : |
| GSM48_CC_CAUSE_RESOURCE_UNAVAIL); |
| } |
| |
| /* FIXME: currently, a CC trans that would not yet be in state GSM_CSTATE_RELEASE_REQ fails to send a |
| * CC Release to the MS if it gets freed here. Hack it to do so. */ |
| if (trans->cc.state != GSM_CSTATE_RELEASE_REQ) { |
| struct gsm_mncc rel = {}; |
| rel.callref = trans->callref; |
| mncc_set_cause(&rel, GSM48_CAUSE_LOC_PRN_S_LU, GSM48_CC_CAUSE_RESOURCE_UNAVAIL); |
| gsm48_cc_tx_release(trans, &rel); |
| } |
| /* This is a final freeing of the transaction. The MNCC release may have triggered the |
| * T308 release timer, but we don't have the luxury of graceful CC Release here. */ |
| gsm48_stop_cc_timer(trans); |
| } |
| if (trans->cc.state != GSM_CSTATE_NULL) |
| new_cc_state(trans, GSM_CSTATE_NULL); |
| |
| gsm48_stop_guard_timer(trans); |
| |
| if (trans->msc_a && trans->msc_a->cc.active_trans == trans) |
| trans->msc_a->cc.active_trans = NULL; |
| } |
| |
| /* call-back from paging the B-end of the connection */ |
| static void cc_paging_cb(struct msc_a *msc_a, struct gsm_trans *trans) |
| { |
| if (trans->msc_a) { |
| LOG_MSC_A_CAT(msc_a, DPAG, LOGL_ERROR, |
| "Handle paging error: transaction already associated with subscriber," |
| " apparently it was already handled. Skip.\n"); |
| return; |
| } |
| |
| if (msc_a) { |
| LOG_TRANS(trans, LOGL_DEBUG, "Paging succeeded\n"); |
| /* Assign conn */ |
| msc_a_get(msc_a, MSC_A_USE_CC); |
| trans->msc_a = msc_a; |
| trans->paging_request = NULL; |
| |
| /* Get the GCR from the MO call leg (if any). */ |
| if (!trans->cc.lcls) |
| trans->cc.lcls = trans_lcls_compose(trans, true); |
| if (trans->cc.lcls && trans->cc.msg.fields & MNCC_F_GCR) { |
| int rc = osmo_dec_gcr(&trans->cc.lcls->gcr, |
| &trans->cc.msg.gcr[0], |
| sizeof(trans->cc.msg.gcr)); |
| if (rc < 0) |
| LOG_TRANS(trans, LOGL_ERROR, "Failed to parse GCR\n"); |
| else |
| trans->cc.lcls->gcr_available = true; |
| } |
| |
| osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_TRANSACTION_ACCEPTED, trans); |
| /* send SETUP request to called party */ |
| gsm48_cc_tx_setup(trans, &trans->cc.msg); |
| } else { |
| LOG_TRANS(trans, LOGL_DEBUG, "Paging expired\n"); |
| /* Temporarily out of order */ |
| mncc_release_ind(trans->net, trans, |
| trans->callref, |
| GSM48_CAUSE_LOC_PRN_S_LU, |
| GSM48_CC_CAUSE_DEST_OOO); |
| trans->callref = 0; |
| trans->paging_request = NULL; |
| trans_free(trans); |
| } |
| } |
| |
| /* bridge channels of two transactions */ |
| static int tch_bridge(struct gsm_network *net, const struct gsm_mncc_bridge *bridge) |
| { |
| struct gsm_trans *trans1 = trans_find_by_callref(net, TRANS_CC, bridge->callref[0]); |
| struct gsm_trans *trans2 = trans_find_by_callref(net, TRANS_CC, bridge->callref[1]); |
| struct call_leg *cl1; |
| struct call_leg *cl2; |
| |
| if (!trans1 || !trans2) { |
| LOG_TRANS(trans1 ? : trans2, LOGL_ERROR, "Cannot MNCC_BRIDGE, one or both call legs are unset\n"); |
| return -EIO; |
| } |
| |
| if (!trans1->msc_a || !trans2->msc_a) { |
| LOG_TRANS(trans1, LOGL_ERROR, "Cannot MNCC_BRIDGE, one or both call legs lack an active connection\n"); |
| LOG_TRANS(trans2, LOGL_ERROR, "Cannot MNCC_BRIDGE, one or both call legs lack an active connection\n"); |
| return -EIO; |
| } |
| |
| LOG_TRANS(trans1, LOGL_DEBUG, "MNCC_BRIDGE: Local bridge to callref 0x%x\n", trans2->callref); |
| LOG_TRANS(trans2, LOGL_DEBUG, "MNCC_BRIDGE: Local bridge to callref 0x%x\n", trans1->callref); |
| |
| /* This call bridging mechanism is only used with the internal MNCC (with external MNCC briding would be done by |
| * the PBX). For inter-MSC Handover scenarios, an external MNCC is mandatory. The conclusion is that in this |
| * code path, there is only one MSC, and the MSC-I role is local, and hence we can directly access the ran_conn. |
| * If we can't, then we must give up. */ |
| cl1 = trans1->msc_a->cc.call_leg; |
| cl2 = trans2->msc_a->cc.call_leg; |
| |
| return call_leg_local_bridge(cl1, trans1->call_id, trans1, cl2, trans2->call_id, trans2); |
| } |
| |
| static int gsm48_cc_rx_status_enq(struct gsm_trans *trans, struct msgb *msg) |
| { |
| LOG_TRANS(trans, LOGL_DEBUG, "-> STATUS ENQ\n"); |
| return gsm48_cc_tx_status(trans, msg); |
| } |
| |
| static void gsm48_cc_timeout(void *arg) |
| { |
| struct gsm_trans *trans = arg; |
| int disconnect = 0, release = 0; |
| int mo_cause = GSM48_CC_CAUSE_RECOVERY_TIMER; |
| int mo_location = GSM48_CAUSE_LOC_USER; |
| int l4_cause = GSM48_CC_CAUSE_NORMAL_UNSPEC; |
| int l4_location = GSM48_CAUSE_LOC_PRN_S_LU; |
| struct gsm_mncc mo_rel, l4_rel; |
| |
| LOG_TRANS(trans, LOGL_INFO, "Timeout of T%x\n", trans->cc.Tcurrent); |
| |
| memset(&mo_rel, 0, sizeof(struct gsm_mncc)); |
| mo_rel.callref = trans->callref; |
| memset(&l4_rel, 0, sizeof(struct gsm_mncc)); |
| l4_rel.callref = trans->callref; |
| |
| switch(trans->cc.Tcurrent) { |
| case 0x303: |
| release = 1; |
| l4_cause = GSM48_CC_CAUSE_USER_NOTRESPOND; |
| break; |
| case 0x310: |
| disconnect = 1; |
| l4_cause = GSM48_CC_CAUSE_USER_NOTRESPOND; |
| break; |
| case 0x313: |
| disconnect = 1; |
| /* unknown, did not find it in the specs */ |
| break; |
| case 0x301: |
| disconnect = 1; |
| l4_cause = GSM48_CC_CAUSE_USER_NOTRESPOND; |
| break; |
| case 0x308: |
| if (!trans->cc.T308_second) { |
| /* restart T308 a second time */ |
| gsm48_cc_tx_release(trans, &trans->cc.msg); |
| trans->cc.T308_second = 1; |
| break; /* stay in release state */ |
| } |
| trans_free(trans); |
| return; |
| case 0x306: |
| release = 1; |
| mo_cause = trans->cc.msg.cause.value; |
| mo_location = trans->cc.msg.cause.location; |
| break; |
| case 0x323: |
| disconnect = 1; |
| break; |
| default: |
| release = 1; |
| } |
| |
| if (release && trans->callref) { |
| /* process release towards layer 4 */ |
| mncc_release_ind(trans->net, trans, trans->callref, |
| l4_location, l4_cause); |
| trans->callref = 0; |
| } |
| |
| if (disconnect && trans->callref) { |
| /* process disconnect towards layer 4 */ |
| mncc_set_cause(&l4_rel, l4_location, l4_cause); |
| mncc_recvmsg(trans->net, trans, MNCC_DISC_IND, &l4_rel); |
| } |
| |
| /* process disconnect towards mobile station */ |
| if (disconnect || release) { |
| mncc_set_cause(&mo_rel, mo_location, mo_cause); |
| mo_rel.cause.diag[0] = ((trans->cc.Tcurrent & 0xf00) >> 8) + '0'; |
| mo_rel.cause.diag[1] = ((trans->cc.Tcurrent & 0x0f0) >> 4) + '0'; |
| mo_rel.cause.diag[2] = (trans->cc.Tcurrent & 0x00f) + '0'; |
| mo_rel.cause.diag_len = 3; |
| |
| if (disconnect) |
| gsm48_cc_tx_disconnect(trans, &mo_rel); |
| if (release) |
| gsm48_cc_tx_release(trans, &mo_rel); |
| } |
| |
| } |
| |
| /* disconnect both calls from the bridge */ |
| static inline void disconnect_bridge(struct gsm_network *net, |
| const struct gsm_mncc_bridge *bridge, int err) |
| { |
| struct gsm_trans *trans0 = trans_find_by_callref(net, TRANS_CC, bridge->callref[0]); |
| struct gsm_trans *trans1 = trans_find_by_callref(net, TRANS_CC, bridge->callref[1]); |
| struct gsm_mncc mx_rel; |
| if (!trans0 || !trans1) |
| return; |
| |
| LOG_TRANS(trans0, LOGL_ERROR, "Failed to bridge TCH for calls %x <-> %x :: %s \n", |
| trans0->callref, trans1->callref, strerror(err)); |
| LOG_TRANS(trans1, LOGL_ERROR, "Failed to bridge TCH for calls %x <-> %x :: %s \n", |
| trans0->callref, trans1->callref, strerror(err)); |
| |
| memset(&mx_rel, 0, sizeof(struct gsm_mncc)); |
| mncc_set_cause(&mx_rel, GSM48_CAUSE_LOC_INN_NET, |
| GSM48_CC_CAUSE_CHAN_UNACCEPT); |
| |
| mx_rel.callref = trans0->callref; |
| gsm48_cc_tx_disconnect(trans0, &mx_rel); |
| |
| mx_rel.callref = trans1->callref; |
| gsm48_cc_tx_disconnect(trans1, &mx_rel); |
| } |
| |
| static void gsm48_start_cc_timer(struct gsm_trans *trans, int current, |
| int sec, int micro) |
| { |
| LOG_TRANS(trans, LOGL_DEBUG, "starting timer T%x with %d seconds\n", current, sec); |
| osmo_timer_setup(&trans->cc.timer, gsm48_cc_timeout, trans); |
| osmo_timer_schedule(&trans->cc.timer, sec, micro); |
| trans->cc.Tcurrent = current; |
| } |
| |
| static int gsm48_cc_rx_setup(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| uint8_t msg_type = gsm48_hdr_msg_type(gh); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| struct tlv_parsed tp; |
| struct gsm_mncc setup; |
| |
| gsm48_start_guard_timer(trans); |
| |
| memset(&setup, 0, sizeof(struct gsm_mncc)); |
| setup.callref = trans->callref; |
| |
| /* New Global Call Reference */ |
| if (!trans->cc.lcls) |
| trans->cc.lcls = trans_lcls_compose(trans, true); |
| |
| /* Pass the LCLS GCR on to the MT call leg via MNCC */ |
| if (trans->cc.lcls) { |
| struct msgb *gcr_msg = msgb_alloc(sizeof(setup.gcr), "MNCC GCR"); |
| const struct osmo_gcr_parsed *gcr = &trans->cc.lcls->gcr; |
| int rc; |
| |
| if (gcr_msg != NULL && (rc = osmo_enc_gcr(gcr_msg, gcr)) > 0) { |
| memcpy(&setup.gcr[0], gcr_msg->data, rc); |
| setup.fields |= MNCC_F_GCR; |
| } else |
| LOG_TRANS(trans, LOGL_ERROR, "Failed to encode GCR\n"); |
| msgb_free(gcr_msg); |
| } |
| |
| OSMO_ASSERT(trans->msc_a); |
| |
| tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); |
| /* emergency setup is identified by msg_type */ |
| if (msg_type == GSM48_MT_CC_EMERG_SETUP) { |
| setup.fields |= MNCC_F_EMERGENCY; |
| setup.emergency = 1; |
| /* use destination number as configured by user (if any) */ |
| if (trans->net->emergency.route_to_msisdn) { |
| setup.fields |= MNCC_F_CALLED; |
| setup.called.type = 0; /* unknown */ |
| setup.called.plan = 0; /* unknown */ |
| OSMO_STRLCPY_ARRAY(setup.called.number, |
| trans->net->emergency.route_to_msisdn); |
| } |
| } |
| |
| /* use subscriber as calling party number */ |
| setup.fields |= MNCC_F_CALLING; |
| OSMO_STRLCPY_ARRAY(setup.calling.number, trans->vsub->msisdn); |
| OSMO_STRLCPY_ARRAY(setup.imsi, trans->vsub->imsi); |
| |
| /* bearer capability */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) { |
| setup.fields |= MNCC_F_BEARER_CAP; |
| gsm48_decode_bearer_cap(&setup.bearer_cap, |
| TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1); |
| |
| /* Create a copy of the bearer capability |
| * in the transaction struct, so we can use |
| * this information later */ |
| memcpy(&trans->bearer_cap, &setup.bearer_cap, |
| sizeof(trans->bearer_cap)); |
| } |
| /* facility */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) { |
| setup.fields |= MNCC_F_FACILITY; |
| gsm48_decode_facility(&setup.facility, |
| TLVP_VAL(&tp, GSM48_IE_FACILITY)-1); |
| } |
| /* called party bcd number */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_CALLED_BCD)) { |
| setup.fields |= MNCC_F_CALLED; |
| gsm48_decode_called(&setup.called, |
| TLVP_VAL(&tp, GSM48_IE_CALLED_BCD)-1); |
| } |
| /* user-user */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) { |
| setup.fields |= MNCC_F_USERUSER; |
| gsm48_decode_useruser(&setup.useruser, |
| TLVP_VAL(&tp, GSM48_IE_USER_USER)-1); |
| } |
| /* ss-version */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) { |
| setup.fields |= MNCC_F_SSVERSION; |
| gsm48_decode_ssversion(&setup.ssversion, |
| TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1); |
| } |
| /* CLIR suppression */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_CLIR_SUPP)) |
| setup.clir.sup = 1; |
| /* CLIR invocation */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_CLIR_INVOC)) |
| setup.clir.inv = 1; |
| /* cc cap */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_CC_CAP)) { |
| setup.fields |= MNCC_F_CCCAP; |
| gsm48_decode_cccap(&setup.cccap, |
| TLVP_VAL(&tp, GSM48_IE_CC_CAP)-1); |
| } |
| |
| /* MO call leg starting, gather all codec information so far known: */ |
| trans_cc_filter_init(trans); |
| trans_cc_filter_set_ran(trans, trans->msc_a->c.ran->type); |
| trans_cc_filter_set_bss(trans, trans->msc_a); |
| if (setup.fields & MNCC_F_BEARER_CAP) |
| trans_cc_filter_set_ms_from_bc(trans, &trans->bearer_cap); |
| trans_cc_filter_run(trans); |
| |
| LOG_TRANS(trans, setup.emergency ? LOGL_NOTICE : LOGL_INFO, "%sSETUP to %s\n", |
| setup.emergency ? "EMERGENCY_" : "", setup.called.number); |
| |
| rate_ctr_inc(rate_ctr_group_get_ctr(trans->net->msc_ctrs, MSC_CTR_CALL_MO_SETUP)); |
| |
| new_cc_state(trans, GSM_CSTATE_INITIATED); |
| |
| /* To complete the MNCC_SETUP_IND, we need to provide an RTP address and port. First instruct the MGW to create |
| * a CN-side RTP conn, and continue with MNCC_SETUP_IND once that is done. Leave trans.cc in GSM_CSTATE_NULL and |
| * note down the msg_type to indicate that we indeed composed an MNCC_SETUP_IND for later. */ |
| setup.msg_type = MNCC_SETUP_IND; |
| trans->cc.msg = setup; |
| return msc_a_try_call_assignment(trans); |
| /* continue in gsm48_cc_rx_setup_cn_local_rtp_port_known() */ |
| } |
| |
| /* Callback for MNCC_SETUP_IND waiting for the core network RTP port to be established by the MGW (via msc_a) */ |
| void gsm48_cc_rx_setup_cn_local_rtp_port_known(struct gsm_trans *trans) |
| { |
| struct msc_a *msc_a = trans->msc_a; |
| struct gsm_mncc setup = trans->cc.msg; |
| struct osmo_sockaddr_str *rtp_cn_local; |
| struct sdp_msg *sdp; |
| int rc; |
| |
| if (trans->cc.state != GSM_CSTATE_INITIATED |
| || setup.msg_type != MNCC_SETUP_IND) { |
| LOG_TRANS(trans, LOGL_ERROR, |
| "Unexpected CC state. Expected GSM_CSTATE_INITIATED and a buffered MNCC_SETUP_IND message," |
| " found CC state %d and msg_type %s\n", |
| trans->cc.state, get_mncc_name(setup.msg_type)); |
| trans->callref = 0; |
| trans_free(trans); |
| return; |
| } |
| |
| if (!msc_a) { |
| LOG_TRANS(trans, LOGL_ERROR, "No connection for CC trans\n"); |
| trans->callref = 0; |
| trans_free(trans); |
| return; |
| } |
| |
| /* 'setup' above has taken the value of trans->cc.msg, we can now clear that. */ |
| trans->cc.msg = (struct gsm_mncc){}; |
| |
| /* Insert the CN side RTP port now available into SDP and compose SDP string */ |
| rtp_cn_local = call_leg_local_ip(msc_a->cc.call_leg, RTP_TO_CN); |
| if (!osmo_sockaddr_str_is_nonzero(rtp_cn_local)) { |
| LOG_TRANS(trans, LOGL_ERROR, "Cannot compose SDP for MNCC_SETUP_IND: no RTP set up for the CN side\n"); |
| trans_free(trans); |
| return; |
| } |
| trans->cc.local.rtp = *rtp_cn_local; |
| |
| sdp = trans->cc.local.audio_codecs.count ? &trans->cc.local : NULL; |
| rc = sdp_msg_to_sdp_str_buf(setup.sdp, sizeof(setup.sdp), sdp); |
| if (rc >= sizeof(setup.sdp)) { |
| LOG_TRANS(trans, LOGL_ERROR, "MNCC_SETUP_IND: SDP too long (%d > %zu bytes)\n", rc, sizeof(setup.sdp)); |
| trans_free(trans); |
| return; |
| } |
| |
| /* indicate setup to MNCC */ |
| mncc_recvmsg(trans->net, trans, MNCC_SETUP_IND, &setup); |
| } |
| |
| static void rx_mncc_sdp(struct gsm_trans *trans, uint32_t mncc_msg_type, const char *sdp, |
| const struct gsm_mncc_bearer_cap *bcap) |
| { |
| struct codec_filter *codecs = &trans->cc.codecs; |
| struct call_leg *cl = trans->msc_a ? trans->msc_a->cc.call_leg : NULL; |
| struct rtp_stream *rtp_cn = cl ? cl->rtp[RTP_TO_CN] : NULL; |
| |
| if (sdp[0]) { |
| int rc = sdp_msg_from_sdp_str(&trans->cc.remote, sdp); |
| if (rc) |
| LOG_TRANS_CAT(trans, DMNCC, LOGL_ERROR, "rx %s: Failed to parse SDP: %d. Trying anyway.\n", |
| get_mncc_name(mncc_msg_type), rc); |
| } |
| |
| /* if there is no SDP information or we failed to parse it, try using the Bearer Cap from MNCC, if any. */ |
| if (!trans->cc.remote.audio_codecs.count && bcap) { |
| trans->cc.remote = (struct sdp_msg){}; |
| trans_cc_set_remote_from_bc(trans, bcap); |
| LOG_TRANS_CAT(trans, DMNCC, LOGL_DEBUG, "rx %s Bearer Cap: remote=%s\n", |
| get_mncc_name(mncc_msg_type), sdp_msg_to_str(&trans->cc.remote)); |
| } |
| |
| if (!trans->cc.remote.audio_codecs.count) |
| LOG_TRANS(trans, LOGL_INFO, |
| "Got no information of remote audio codecs: neither SDP nor Bearer Capability. Trying anyway.\n"); |
| |
| trans_cc_filter_run(trans); |
| if (rtp_cn) { |
| rtp_stream_set_remote_addr_and_codecs(rtp_cn, &trans->cc.remote); |
| rtp_stream_commit(rtp_cn); |
| } |
| |
| /* See if we need to switch codecs to maintain TFO: has the remote side changed the codecs information? If we |
| * have already assigned a specific codec here, but the remote call leg has now chosen a different codec, we |
| * need to re-assign this call leg to match the remote leg. */ |
| if (!sdp_audio_codec_is_set(&codecs->assignment)) { |
| /* Voice channel assignment has not completed. Do not interfere. */ |
| return; |
| } |
| if (!trans->cc.remote.audio_codecs.count) { |
| /* Don't know remote codecs, nothing to do. */ |
| return; |
| } |
| if (sdp_audio_codecs_by_descr(&trans->cc.remote.audio_codecs, &codecs->assignment)) { |
| /* The assigned codec is part of the remote codec set. All is well. */ |
| /* TODO: maybe this should require exactly the *first* remote codec to match, because we cannot flexibly |
| * transcode, and assume the actual payload we will receive is listed in the first place? */ |
| return; |
| } |
| |
| /* We've already completed Assignment of a voice channel (some time ago), and now the remote side has changed |
| * to a mismatching codec (list). Try to re-assign this side to a matching codec. */ |
| LOG_TRANS(trans, LOGL_INFO, "Remote call leg mismatches assigned codec: %s\n", |
| codec_filter_to_str(&trans->cc.codecs, &trans->cc.local, &trans->cc.remote)); |
| msc_a_tx_assignment_cmd(trans->msc_a); |
| } |
| |
| static int gsm48_cc_tx_setup(struct gsm_trans *trans, void *arg) |
| { |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC SETUP"); |
| struct gsm48_hdr *gh; |
| struct gsm_mncc *setup = arg; |
| int rc, trans_id; |
| struct gsm_mncc_bearer_cap bearer_cap; |
| |
| gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| /* transaction id must not be assigned */ |
| if (trans->transaction_id != TRANS_ID_UNASSIGNED) { |
| LOG_TRANS(trans, LOGL_DEBUG, "TX Setup with assigned transaction. " |
| "This is not allowed!\n"); |
| /* Temporarily out of order */ |
| rc = mncc_release_ind(trans->net, trans, trans->callref, |
| GSM48_CAUSE_LOC_PRN_S_LU, |
| GSM48_CC_CAUSE_RESOURCE_UNAVAIL); |
| trans->callref = 0; |
| trans_free(trans); |
| msgb_free(msg); |
| return rc; |
| } |
| |
| /* Get free transaction_id */ |
| trans_id = trans_assign_trans_id(trans->net, trans->vsub, TRANS_CC); |
| if (trans_id < 0) { |
| /* no free transaction ID */ |
| rc = mncc_release_ind(trans->net, trans, trans->callref, |
| GSM48_CAUSE_LOC_PRN_S_LU, |
| GSM48_CC_CAUSE_RESOURCE_UNAVAIL); |
| trans->callref = 0; |
| trans_free(trans); |
| msgb_free(msg); |
| return rc; |
| } |
| trans->transaction_id = trans_id; |
| |
| gh->msg_type = GSM48_MT_CC_SETUP; |
| |
| gsm48_start_cc_timer(trans, 0x303, GSM48_T303); |
| |
| /* MT call leg is starting. Gather all codecs information so far known. |
| * (Usually) paging has succeeded, and now we're processing the MNCC Setup from the remote MO call leg. |
| * Initialize the codecs filter with this side's BSS' codec list, received at Complete Layer 3. |
| * We haven't received the MT MS's Bearer Capabilities yet; the Bearer Capabilities handled here are |
| * actually the remote call leg's Bearer Capabilities. */ |
| trans_cc_filter_init(trans); |
| trans_cc_filter_set_ran(trans, trans->msc_a->c.ran->type); |
| trans_cc_filter_set_bss(trans, trans->msc_a); |
| if (setup->fields & MNCC_F_BEARER_CAP) |
| trans->bearer_cap.transfer = setup->bearer_cap.transfer; |
| |
| switch (trans->bearer_cap.transfer) { |
| case GSM48_BCAP_ITCAP_SPEECH: |
| /* if SDP is included in the MNCC, take that as definitive list of remote audio codecs. */ |
| rx_mncc_sdp(trans, setup->msg_type, setup->sdp, |
| (setup->fields & MNCC_F_BEARER_CAP) ? &setup->bearer_cap : NULL); |
| /* rx_mncc_sdp() has called trans_cc_filter_run(trans); */ |
| break; |
| case GSM48_BCAP_ITCAP_3k1_AUDIO: |
| case GSM48_BCAP_ITCAP_FAX_G3: |
| case GSM48_BCAP_ITCAP_UNR_DIG_INF: |
| if (setup->fields & MNCC_F_BEARER_CAP) { |
| trans->cc.remote = (struct sdp_msg){}; |
| trans_cc_set_remote_from_bc(trans, &setup->bearer_cap); |
| LOG_TRANS_CAT(trans, DMNCC, LOGL_DEBUG, "rx %s Bearer Cap: remote=%s\n", |
| get_mncc_name(setup->msg_type), sdp_msg_to_str(&trans->cc.remote)); |
| } else { |
| LOG_TRANS(trans, LOGL_INFO, |
| "Got no information of remote Bearer Capability. Trying anyway.\n"); |
| sdp_audio_codecs_set_csd(&trans->cc.codecs.ms); |
| } |
| trans_cc_filter_run(trans); |
| break; |
| default: |
| LOG_TRANS(trans, LOGL_ERROR, "Handling of information transfer capability %d not implemented\n", |
| trans->bearer_cap.transfer); |
| break; |
| } |
| |
| /* Compose Bearer Capability information that reflects only the codecs (Speech Versions) / CSD bearer services |
| * remaining after intersecting MS, BSS and remote call leg restrictions. To store in trans for later use, and |
| * to include in the outgoing CC Setup message. */ |
| switch (trans->bearer_cap.transfer) { |
| case GSM48_BCAP_ITCAP_SPEECH: |
| bearer_cap = (struct gsm_mncc_bearer_cap){ |
| .speech_ver = { -1 }, |
| }; |
| sdp_audio_codecs_to_bearer_cap(&bearer_cap, &trans->cc.local.audio_codecs); |
| rc = bearer_cap_set_radio(&bearer_cap); |
| if (rc) { |
| LOG_TRANS(trans, LOGL_ERROR, "Error composing Bearer Capability for CC Setup\n"); |
| trans_free(trans); |
| msgb_free(msg); |
| return rc; |
| } |
| /* If no resulting codecs remain, error out. We cannot find a codec that matches both call legs. If the MGW were |
| * able to transcode, we could use non-identical codecs on each conn of the MGW endpoint, but we are aiming for |
| * finding a matching codec. */ |
| if (bearer_cap.speech_ver[0] == -1) { |
| LOG_TRANS(trans, LOGL_ERROR, "%s: no codec match possible: %s\n", |
| get_mncc_name(setup->msg_type), |
| codec_filter_to_str(&trans->cc.codecs, &trans->cc.local, &trans->cc.remote)); |
| |
| /* incompatible codecs */ |
| rc = mncc_release_ind(trans->net, trans, trans->callref, |
| GSM48_CAUSE_LOC_PRN_S_LU, |
| GSM48_CC_CAUSE_INCOMPAT_DEST /* TODO: correct cause code? */); |
| trans->callref = 0; |
| trans_free(trans); |
| msgb_free(msg); |
| return rc; |
| } |
| break; |
| case GSM48_BCAP_ITCAP_3k1_AUDIO: |
| case GSM48_BCAP_ITCAP_FAX_G3: |
| case GSM48_BCAP_ITCAP_UNR_DIG_INF: |
| if (csd_bs_list_to_bearer_cap(&bearer_cap, &trans->cc.local.bearer_services) == 0) { |
| LOG_TRANS(trans, LOGL_ERROR, "Error composing Bearer Capability for CC Setup\n"); |
| |
| /* incompatible codecs */ |
| rc = mncc_release_ind(trans->net, trans, trans->callref, |
| GSM48_CAUSE_LOC_PRN_S_LU, |
| GSM48_CC_CAUSE_INCOMPAT_DEST /* TODO: correct cause code? */); |
| trans->callref = 0; |
| trans_free(trans); |
| msgb_free(msg); |
| return rc; |
| } |
| break; |
| } |
| |
| /* Create a copy of the bearer capability in the transaction struct, so we can use this information later */ |
| trans->bearer_cap = bearer_cap; |
| |
| gsm48_encode_bearer_cap(msg, 0, &bearer_cap); |
| |
| /* facility */ |
| if (setup->fields & MNCC_F_FACILITY) |
| gsm48_encode_facility(msg, 0, &setup->facility); |
| /* progress */ |
| if (setup->fields & MNCC_F_PROGRESS) |
| gsm48_encode_progress(msg, 0, &setup->progress); |
| /* calling party BCD number */ |
| if (setup->fields & MNCC_F_CALLING) |
| gsm48_encode_calling(msg, &setup->calling); |
| /* called party BCD number */ |
| if (setup->fields & MNCC_F_CALLED) |
| gsm48_encode_called(msg, &setup->called); |
| /* user-user */ |
| if (setup->fields & MNCC_F_USERUSER) |
| gsm48_encode_useruser(msg, 0, &setup->useruser); |
| /* redirecting party BCD number */ |
| if (setup->fields & MNCC_F_REDIRECTING) |
| gsm48_encode_redirecting(msg, &setup->redirecting); |
| /* signal */ |
| if (setup->fields & MNCC_F_SIGNAL) |
| gsm48_encode_signal(msg, setup->signal); |
| |
| new_cc_state(trans, GSM_CSTATE_CALL_PRESENT); |
| |
| rate_ctr_inc(rate_ctr_group_get_ctr(trans->net->msc_ctrs, MSC_CTR_CALL_MT_SETUP)); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_rx_call_conf(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| struct tlv_parsed tp; |
| struct gsm_mncc call_conf; |
| int rc; |
| |
| gsm48_stop_cc_timer(trans); |
| gsm48_start_cc_timer(trans, 0x310, GSM48_T310); |
| |
| memset(&call_conf, 0, sizeof(struct gsm_mncc)); |
| call_conf.callref = trans->callref; |
| |
| tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); |
| #if 0 |
| /* repeat */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_REPEAT_CIR)) |
| call_conf.repeat = 1; |
| if (TLVP_PRESENT(&tp, GSM48_IE_REPEAT_SEQ)) |
| call_conf.repeat = 2; |
| #endif |
| /* bearer capability */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) { |
| call_conf.fields |= MNCC_F_BEARER_CAP; |
| gsm48_decode_bearer_cap(&call_conf.bearer_cap, |
| TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1); |
| |
| /* Create a copy of the bearer capability |
| * in the transaction struct, so we can use |
| * this information later */ |
| memcpy(&trans->bearer_cap, &call_conf.bearer_cap, |
| sizeof(trans->bearer_cap)); |
| |
| /* This is the MT call leg's Call Conf, containing the MS Bearer Capabilities of the MT MS. |
| * Store in codecs filter. */ |
| trans_cc_filter_set_ms_from_bc(trans, &call_conf.bearer_cap); |
| } |
| |
| /* cause */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) { |
| call_conf.fields |= MNCC_F_CAUSE; |
| gsm48_decode_cause(&call_conf.cause, |
| TLVP_VAL(&tp, GSM48_IE_CAUSE)-1); |
| } |
| /* cc cap */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_CC_CAP)) { |
| call_conf.fields |= MNCC_F_CCCAP; |
| gsm48_decode_cccap(&call_conf.cccap, |
| TLVP_VAL(&tp, GSM48_IE_CC_CAP)-1); |
| } |
| |
| /* IMSI of called subscriber */ |
| OSMO_STRLCPY_ARRAY(call_conf.imsi, trans->vsub->imsi); |
| |
| /* Assign call (if not done yet) */ |
| rc = msc_a_try_call_assignment(trans); |
| |
| /* don't continue, if there were problems with |
| * the call assignment. */ |
| if (rc) |
| return rc; |
| |
| /* Directly ack with MNCC_CALL_CONF_IND, not yet containing SDP or RTP IP:port information. */ |
| new_cc_state(trans, GSM_CSTATE_MO_TERM_CALL_CONF); |
| return mncc_recvmsg(trans->net, trans, MNCC_CALL_CONF_IND, &call_conf); |
| } |
| |
| static int mncc_recv_rtp(struct gsm_network *net, struct gsm_trans *trans, uint32_t callref, |
| int cmd, struct osmo_sockaddr_str *rtp_addr, uint32_t payload_type, |
| uint32_t payload_msg_type, const struct sdp_msg *sdp); |
| |
| static int gsm48_cc_mt_rtp_port_and_codec_known(struct gsm_trans *trans) |
| { |
| struct msc_a *msc_a = trans->msc_a; |
| struct osmo_sockaddr_str *rtp_cn_local; |
| struct gsm_mncc_rtp; |
| |
| if (!msc_a) { |
| LOG_TRANS(trans, LOGL_ERROR, "No connection for CC trans\n"); |
| trans->callref = 0; |
| trans_free(trans); |
| return -EINVAL; |
| } |
| |
| /* Insert the CN side RTP port now available into SDP */ |
| rtp_cn_local = call_leg_local_ip(msc_a->cc.call_leg, RTP_TO_CN); |
| if (!rtp_cn_local) { |
| LOG_TRANS(trans, LOGL_ERROR, "Cannot compose SDP for MNCC_RTP_CREATE: no RTP set up for the CN side\n"); |
| trans_free(trans); |
| return -EINVAL; |
| } |
| trans->cc.local.rtp = *rtp_cn_local; |
| |
| trans_cc_filter_run(trans); |
| |
| /* If we haven't completed Assignment yet, don't sent MNCC_RTP_CREATE */ |
| if (!sdp_audio_codec_is_set(&trans->cc.codecs.assignment)) { |
| LOG_TRANS(trans, LOGL_DEBUG, "no codec confirmed by Assignment yet\n"); |
| return 0; |
| } |
| |
| return mncc_recv_rtp(msc_a_net(msc_a), trans, trans->callref, MNCC_RTP_CREATE, rtp_cn_local, 0, 0, |
| &trans->cc.local); |
| } |
| |
| static int gsm48_cc_tx_call_proc_and_assign(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *proceeding = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC PROC"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| int rc; |
| |
| gh->msg_type = GSM48_MT_CC_CALL_PROC; |
| |
| new_cc_state(trans, GSM_CSTATE_MO_CALL_PROC); |
| |
| /* bearer capability */ |
| if (proceeding->fields & MNCC_F_BEARER_CAP) { |
| /* MNCC should not switch from e.g. CSD to speech */ |
| if (proceeding->bearer_cap.transfer != trans->bearer_cap.transfer) { |
| LOG_TRANS(trans, LOGL_ERROR, "Unexpected Information Transfer Capability %d from MNCC," |
| " transaction has %d\n", |
| proceeding->bearer_cap.transfer, |
| trans->bearer_cap.transfer); |
| return -EINVAL; |
| } |
| gsm48_encode_bearer_cap(msg, 0, &proceeding->bearer_cap); |
| memcpy(&trans->bearer_cap, &proceeding->bearer_cap, sizeof(trans->bearer_cap)); |
| } |
| /* facility */ |
| if (proceeding->fields & MNCC_F_FACILITY) |
| gsm48_encode_facility(msg, 0, &proceeding->facility); |
| /* progress */ |
| if (proceeding->fields & MNCC_F_PROGRESS) |
| gsm48_encode_progress(msg, 0, &proceeding->progress); |
| |
| rc = trans_tx_gsm48(trans, msg); |
| if (rc) |
| return rc; |
| |
| /* Assign call (if not done yet) */ |
| return msc_a_try_call_assignment(trans); |
| } |
| |
| static int gsm48_cc_rx_alerting(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| struct tlv_parsed tp; |
| struct gsm_mncc alerting; |
| int rc; |
| |
| gsm48_stop_cc_timer(trans); |
| gsm48_start_cc_timer(trans, 0x301, GSM48_T301); |
| |
| memset(&alerting, 0, sizeof(struct gsm_mncc)); |
| alerting.callref = trans->callref; |
| tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); |
| /* facility */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) { |
| alerting.fields |= MNCC_F_FACILITY; |
| gsm48_decode_facility(&alerting.facility, |
| TLVP_VAL(&tp, GSM48_IE_FACILITY)-1); |
| } |
| |
| /* progress */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_PROGR_IND)) { |
| alerting.fields |= MNCC_F_PROGRESS; |
| gsm48_decode_progress(&alerting.progress, |
| TLVP_VAL(&tp, GSM48_IE_PROGR_IND)-1); |
| } |
| /* ss-version */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) { |
| alerting.fields |= MNCC_F_SSVERSION; |
| gsm48_decode_ssversion(&alerting.ssversion, |
| TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1); |
| } |
| |
| new_cc_state(trans, GSM_CSTATE_CALL_RECEIVED); |
| |
| trans_cc_filter_run(trans); |
| rc = sdp_msg_to_sdp_str_buf(alerting.sdp, sizeof(alerting.sdp), &trans->cc.local); |
| if (rc >= sizeof(alerting.sdp)) { |
| LOG_TRANS(trans, LOGL_ERROR, "MNCC_ALERT_IND: SDP too long (%d > %zu bytes)\n", |
| rc, sizeof(alerting.sdp)); |
| trans_free(trans); |
| return -EINVAL; |
| } |
| |
| return mncc_recvmsg(trans->net, trans, MNCC_ALERT_IND, |
| &alerting); |
| } |
| |
| static int gsm48_cc_tx_alerting(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *alerting = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC ALERT"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| int rc; |
| |
| gh->msg_type = GSM48_MT_CC_ALERTING; |
| |
| /* facility */ |
| if (alerting->fields & MNCC_F_FACILITY) |
| gsm48_encode_facility(msg, 0, &alerting->facility); |
| /* progress */ |
| if (alerting->fields & MNCC_F_PROGRESS) |
| gsm48_encode_progress(msg, 0, &alerting->progress); |
| /* user-user */ |
| if (alerting->fields & MNCC_F_USERUSER) |
| gsm48_encode_useruser(msg, 0, &alerting->useruser); |
| |
| new_cc_state(trans, GSM_CSTATE_CALL_DELIVERED); |
| |
| if (alerting->sdp[0]) |
| rx_mncc_sdp(trans, alerting->msg_type, alerting->sdp, |
| (alerting->fields & MNCC_F_BEARER_CAP) ? &alerting->bearer_cap : NULL); |
| |
| /* handle the MNCC event */ |
| rc = trans_tx_gsm48(trans, msg); |
| return rc; |
| } |
| |
| static int gsm48_cc_tx_progress(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *progress = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC PROGRESS"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_PROGRESS; |
| |
| /* progress */ |
| gsm48_encode_progress(msg, 1, &progress->progress); |
| /* user-user */ |
| if (progress->fields & MNCC_F_USERUSER) |
| gsm48_encode_useruser(msg, 0, &progress->useruser); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_tx_connect(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *connect = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSN 04.08 CC CON"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_CONNECT; |
| |
| gsm48_stop_cc_timer(trans); |
| gsm48_start_cc_timer(trans, 0x313, GSM48_T313); |
| |
| /* facility */ |
| if (connect->fields & MNCC_F_FACILITY) |
| gsm48_encode_facility(msg, 0, &connect->facility); |
| /* progress */ |
| if (connect->fields & MNCC_F_PROGRESS) |
| gsm48_encode_progress(msg, 0, &connect->progress); |
| /* connected number */ |
| if (connect->fields & MNCC_F_CONNECTED) |
| gsm48_encode_connected(msg, &connect->connected); |
| /* user-user */ |
| if (connect->fields & MNCC_F_USERUSER) |
| gsm48_encode_useruser(msg, 0, &connect->useruser); |
| |
| new_cc_state(trans, GSM_CSTATE_CONNECT_IND); |
| |
| if (connect->sdp[0]) |
| rx_mncc_sdp(trans, connect->msg_type, connect->sdp, |
| (connect->fields & MNCC_F_BEARER_CAP) ? &connect->bearer_cap : NULL); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_rx_connect(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| struct tlv_parsed tp; |
| struct gsm_mncc connect; |
| |
| gsm48_stop_cc_timer(trans); |
| |
| memset(&connect, 0, sizeof(struct gsm_mncc)); |
| connect.callref = trans->callref; |
| tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); |
| /* use subscriber as connected party number */ |
| connect.fields |= MNCC_F_CONNECTED; |
| OSMO_STRLCPY_ARRAY(connect.connected.number, trans->vsub->msisdn); |
| OSMO_STRLCPY_ARRAY(connect.imsi, trans->vsub->imsi); |
| |
| /* facility */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) { |
| connect.fields |= MNCC_F_FACILITY; |
| gsm48_decode_facility(&connect.facility, |
| TLVP_VAL(&tp, GSM48_IE_FACILITY)-1); |
| } |
| /* user-user */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) { |
| connect.fields |= MNCC_F_USERUSER; |
| gsm48_decode_useruser(&connect.useruser, |
| TLVP_VAL(&tp, GSM48_IE_USER_USER)-1); |
| } |
| /* ss-version */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) { |
| connect.fields |= MNCC_F_SSVERSION; |
| gsm48_decode_ssversion(&connect.ssversion, |
| TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1); |
| } |
| |
| new_cc_state(trans, GSM_CSTATE_CONNECT_REQUEST); |
| rate_ctr_inc(rate_ctr_group_get_ctr(trans->net->msc_ctrs, MSC_CTR_CALL_MT_CONNECT)); |
| |
| trans_cc_filter_run(trans); |
| sdp_msg_to_sdp_str_buf(connect.sdp, sizeof(connect.sdp), &trans->cc.local); |
| return mncc_recvmsg(trans->net, trans, MNCC_SETUP_CNF, &connect); |
| } |
| |
| |
| static int gsm48_cc_rx_connect_ack(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm_mncc connect_ack; |
| |
| gsm48_stop_cc_timer(trans); |
| |
| new_cc_state(trans, GSM_CSTATE_ACTIVE); |
| rate_ctr_inc(rate_ctr_group_get_ctr(trans->net->msc_ctrs, MSC_CTR_CALL_MO_CONNECT_ACK)); |
| |
| memset(&connect_ack, 0, sizeof(struct gsm_mncc)); |
| connect_ack.callref = trans->callref; |
| |
| return mncc_recvmsg(trans->net, trans, MNCC_SETUP_COMPL_IND, |
| &connect_ack); |
| } |
| |
| static int gsm48_cc_tx_connect_ack(struct gsm_trans *trans, void *arg) |
| { |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC CON ACK"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_CONNECT_ACK; |
| |
| new_cc_state(trans, GSM_CSTATE_ACTIVE); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_rx_disconnect(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| struct tlv_parsed tp; |
| struct gsm_mncc disc; |
| |
| gsm48_stop_cc_timer(trans); |
| |
| new_cc_state(trans, GSM_CSTATE_DISCONNECT_REQ); |
| |
| memset(&disc, 0, sizeof(struct gsm_mncc)); |
| disc.callref = trans->callref; |
| tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_CAUSE, 0); |
| /* cause */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) { |
| disc.fields |= MNCC_F_CAUSE; |
| gsm48_decode_cause(&disc.cause, |
| TLVP_VAL(&tp, GSM48_IE_CAUSE)-1); |
| } |
| /* facility */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) { |
| disc.fields |= MNCC_F_FACILITY; |
| gsm48_decode_facility(&disc.facility, |
| TLVP_VAL(&tp, GSM48_IE_FACILITY)-1); |
| } |
| /* user-user */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) { |
| disc.fields |= MNCC_F_USERUSER; |
| gsm48_decode_useruser(&disc.useruser, |
| TLVP_VAL(&tp, GSM48_IE_USER_USER)-1); |
| } |
| /* ss-version */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) { |
| disc.fields |= MNCC_F_SSVERSION; |
| gsm48_decode_ssversion(&disc.ssversion, |
| TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1); |
| } |
| |
| return mncc_recvmsg(trans->net, trans, MNCC_DISC_IND, &disc); |
| } |
| |
| static struct gsm_mncc_cause default_cause = { |
| .location = GSM48_CAUSE_LOC_PRN_S_LU, |
| .coding = 0, |
| .rec = 0, |
| .rec_val = 0, |
| .value = GSM48_CC_CAUSE_NORMAL_UNSPEC, |
| .diag_len = 0, |
| .diag = { 0 }, |
| }; |
| |
| static int gsm48_cc_tx_disconnect(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *disc = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC DISC"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_DISCONNECT; |
| |
| gsm48_stop_cc_timer(trans); |
| gsm48_start_cc_timer(trans, 0x306, GSM48_T306); |
| |
| /* cause */ |
| if (disc->fields & MNCC_F_CAUSE) |
| gsm48_encode_cause(msg, 1, &disc->cause); |
| else |
| gsm48_encode_cause(msg, 1, &default_cause); |
| |
| /* facility */ |
| if (disc->fields & MNCC_F_FACILITY) |
| gsm48_encode_facility(msg, 0, &disc->facility); |
| /* progress */ |
| if (disc->fields & MNCC_F_PROGRESS) |
| gsm48_encode_progress(msg, 0, &disc->progress); |
| /* user-user */ |
| if (disc->fields & MNCC_F_USERUSER) |
| gsm48_encode_useruser(msg, 0, &disc->useruser); |
| |
| /* store disconnect cause for T306 expiry */ |
| memcpy(&trans->cc.msg, disc, sizeof(struct gsm_mncc)); |
| |
| new_cc_state(trans, GSM_CSTATE_DISCONNECT_IND); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_rx_release(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| struct tlv_parsed tp; |
| struct gsm_mncc rel; |
| int rc; |
| |
| gsm48_stop_cc_timer(trans); |
| |
| memset(&rel, 0, sizeof(struct gsm_mncc)); |
| rel.callref = trans->callref; |
| tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); |
| /* cause */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) { |
| rel.fields |= MNCC_F_CAUSE; |
| gsm48_decode_cause(&rel.cause, |
| TLVP_VAL(&tp, GSM48_IE_CAUSE)-1); |
| } |
| /* facility */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) { |
| rel.fields |= MNCC_F_FACILITY; |
| gsm48_decode_facility(&rel.facility, |
| TLVP_VAL(&tp, GSM48_IE_FACILITY)-1); |
| } |
| /* user-user */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) { |
| rel.fields |= MNCC_F_USERUSER; |
| gsm48_decode_useruser(&rel.useruser, |
| TLVP_VAL(&tp, GSM48_IE_USER_USER)-1); |
| } |
| /* ss-version */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) { |
| rel.fields |= MNCC_F_SSVERSION; |
| gsm48_decode_ssversion(&rel.ssversion, |
| TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1); |
| } |
| |
| if (trans->cc.state == GSM_CSTATE_RELEASE_REQ) { |
| /* release collision 5.4.5 */ |
| rc = mncc_recvmsg(trans->net, trans, MNCC_REL_CNF, &rel); |
| } else { |
| rc = gsm48_tx_simple(trans->msc_a, |
| GSM48_PDISC_CC | (trans->transaction_id << 4), |
| GSM48_MT_CC_RELEASE_COMPL); |
| rc = mncc_recvmsg(trans->net, trans, MNCC_REL_IND, &rel); |
| } |
| |
| new_cc_state(trans, GSM_CSTATE_NULL); |
| |
| trans->callref = 0; |
| trans_free(trans); |
| |
| return rc; |
| } |
| |
| static int gsm48_cc_tx_release(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *rel = arg; |
| struct msgb *msg; |
| struct gsm48_hdr *gh; |
| |
| if (!trans->msc_a) { |
| LOG_TRANS(trans, LOGL_DEBUG, "Cannot send CC REL, there is no MSC-A connection\n"); |
| return -EINVAL; |
| } |
| |
| msg = gsm48_msgb_alloc_name("GSM 04.08 CC REL"); |
| gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_RELEASE; |
| |
| gsm48_stop_cc_timer(trans); |
| gsm48_start_cc_timer(trans, 0x308, GSM48_T308); |
| |
| /* cause */ |
| if (rel->fields & MNCC_F_CAUSE) |
| gsm48_encode_cause(msg, 0, &rel->cause); |
| /* facility */ |
| if (rel->fields & MNCC_F_FACILITY) |
| gsm48_encode_facility(msg, 0, &rel->facility); |
| /* user-user */ |
| if (rel->fields & MNCC_F_USERUSER) |
| gsm48_encode_useruser(msg, 0, &rel->useruser); |
| |
| trans->cc.T308_second = 0; |
| memcpy(&trans->cc.msg, rel, sizeof(struct gsm_mncc)); |
| |
| if (trans->cc.state != GSM_CSTATE_RELEASE_REQ) |
| new_cc_state(trans, GSM_CSTATE_RELEASE_REQ); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_rx_release_compl(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| struct tlv_parsed tp; |
| struct gsm_mncc rel; |
| int rc = 0; |
| |
| gsm48_stop_cc_timer(trans); |
| |
| memset(&rel, 0, sizeof(struct gsm_mncc)); |
| rel.callref = trans->callref; |
| tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); |
| /* cause */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) { |
| rel.fields |= MNCC_F_CAUSE; |
| gsm48_decode_cause(&rel.cause, |
| TLVP_VAL(&tp, GSM48_IE_CAUSE)-1); |
| } |
| /* facility */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) { |
| rel.fields |= MNCC_F_FACILITY; |
| gsm48_decode_facility(&rel.facility, |
| TLVP_VAL(&tp, GSM48_IE_FACILITY)-1); |
| } |
| /* user-user */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) { |
| rel.fields |= MNCC_F_USERUSER; |
| gsm48_decode_useruser(&rel.useruser, |
| TLVP_VAL(&tp, GSM48_IE_USER_USER)-1); |
| } |
| /* ss-version */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) { |
| rel.fields |= MNCC_F_SSVERSION; |
| gsm48_decode_ssversion(&rel.ssversion, |
| TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1); |
| } |
| |
| if (trans->callref) { |
| switch (trans->cc.state) { |
| case GSM_CSTATE_CALL_PRESENT: |
| rc = mncc_recvmsg(trans->net, trans, |
| MNCC_REJ_IND, &rel); |
| break; |
| case GSM_CSTATE_RELEASE_REQ: |
| rc = mncc_recvmsg(trans->net, trans, |
| MNCC_REL_CNF, &rel); |
| break; |
| default: |
| rc = mncc_recvmsg(trans->net, trans, |
| MNCC_REL_IND, &rel); |
| } |
| } |
| |
| trans->callref = 0; |
| trans_free(trans); |
| |
| return rc; |
| } |
| |
| static int gsm48_cc_tx_release_compl(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *rel = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC REL COMPL"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| int ret; |
| |
| gh->msg_type = GSM48_MT_CC_RELEASE_COMPL; |
| |
| trans->callref = 0; |
| |
| gsm48_stop_cc_timer(trans); |
| |
| /* cause */ |
| if (rel->fields & MNCC_F_CAUSE) |
| gsm48_encode_cause(msg, 0, &rel->cause); |
| /* facility */ |
| if (rel->fields & MNCC_F_FACILITY) |
| gsm48_encode_facility(msg, 0, &rel->facility); |
| /* user-user */ |
| if (rel->fields & MNCC_F_USERUSER) |
| gsm48_encode_useruser(msg, 0, &rel->useruser); |
| |
| ret = trans_tx_gsm48(trans, msg); |
| |
| trans_free(trans); |
| |
| return ret; |
| } |
| |
| static int gsm48_cc_rx_facility(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| struct tlv_parsed tp; |
| struct gsm_mncc fac; |
| |
| memset(&fac, 0, sizeof(struct gsm_mncc)); |
| fac.callref = trans->callref; |
| tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_FACILITY, 0); |
| /* facility */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) { |
| fac.fields |= MNCC_F_FACILITY; |
| gsm48_decode_facility(&fac.facility, |
| TLVP_VAL(&tp, GSM48_IE_FACILITY)-1); |
| } |
| /* ss-version */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) { |
| fac.fields |= MNCC_F_SSVERSION; |
| gsm48_decode_ssversion(&fac.ssversion, |
| TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1); |
| } |
| |
| return mncc_recvmsg(trans->net, trans, MNCC_FACILITY_IND, &fac); |
| } |
| |
| static int gsm48_cc_tx_facility(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *fac = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC FAC"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_FACILITY; |
| |
| /* facility */ |
| gsm48_encode_facility(msg, 1, &fac->facility); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_rx_hold(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm_mncc hold; |
| |
| memset(&hold, 0, sizeof(struct gsm_mncc)); |
| hold.callref = trans->callref; |
| return mncc_recvmsg(trans->net, trans, MNCC_HOLD_IND, &hold); |
| } |
| |
| static int gsm48_cc_tx_hold_ack(struct gsm_trans *trans, void *arg) |
| { |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC HLD ACK"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_HOLD_ACK; |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_tx_hold_rej(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *hold_rej = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC HLD REJ"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_HOLD_REJ; |
| |
| /* cause */ |
| if (hold_rej->fields & MNCC_F_CAUSE) |
| gsm48_encode_cause(msg, 1, &hold_rej->cause); |
| else |
| gsm48_encode_cause(msg, 1, &default_cause); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_rx_retrieve(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm_mncc retrieve; |
| |
| memset(&retrieve, 0, sizeof(struct gsm_mncc)); |
| retrieve.callref = trans->callref; |
| return mncc_recvmsg(trans->net, trans, MNCC_RETRIEVE_IND, |
| &retrieve); |
| } |
| |
| static int gsm48_cc_tx_retrieve_ack(struct gsm_trans *trans, void *arg) |
| { |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC RETR ACK"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_RETR_ACK; |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_tx_retrieve_rej(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *retrieve_rej = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC RETR REJ"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_RETR_REJ; |
| |
| /* cause */ |
| if (retrieve_rej->fields & MNCC_F_CAUSE) |
| gsm48_encode_cause(msg, 1, &retrieve_rej->cause); |
| else |
| gsm48_encode_cause(msg, 1, &default_cause); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_rx_start_dtmf(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| struct tlv_parsed tp; |
| struct gsm_mncc dtmf; |
| |
| memset(&dtmf, 0, sizeof(struct gsm_mncc)); |
| dtmf.callref = trans->callref; |
| tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); |
| /* keypad facility */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_KPD_FACILITY)) { |
| dtmf.fields |= MNCC_F_KEYPAD; |
| gsm48_decode_keypad(&dtmf.keypad, |
| TLVP_VAL(&tp, GSM48_IE_KPD_FACILITY)-1); |
| } |
| |
| return mncc_recvmsg(trans->net, trans, MNCC_START_DTMF_IND, &dtmf); |
| } |
| |
| static int gsm48_cc_tx_start_dtmf_ack(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *dtmf = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DTMF ACK"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_START_DTMF_ACK; |
| |
| /* keypad */ |
| if (dtmf->fields & MNCC_F_KEYPAD) |
| gsm48_encode_keypad(msg, dtmf->keypad); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_tx_start_dtmf_rej(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *dtmf = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DTMF REJ"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_START_DTMF_REJ; |
| |
| /* cause */ |
| if (dtmf->fields & MNCC_F_CAUSE) |
| gsm48_encode_cause(msg, 1, &dtmf->cause); |
| else |
| gsm48_encode_cause(msg, 1, &default_cause); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_tx_stop_dtmf_ack(struct gsm_trans *trans, void *arg) |
| { |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DTMF STP ACK"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_STOP_DTMF_ACK; |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_rx_stop_dtmf(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm_mncc dtmf; |
| |
| memset(&dtmf, 0, sizeof(struct gsm_mncc)); |
| dtmf.callref = trans->callref; |
| |
| return mncc_recvmsg(trans->net, trans, MNCC_STOP_DTMF_IND, &dtmf); |
| } |
| |
| static int gsm48_cc_rx_modify(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| struct tlv_parsed tp; |
| struct gsm_mncc modify; |
| |
| memset(&modify, 0, sizeof(struct gsm_mncc)); |
| modify.callref = trans->callref; |
| tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_BEARER_CAP, 0); |
| /* bearer capability */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) { |
| modify.fields |= MNCC_F_BEARER_CAP; |
| gsm48_decode_bearer_cap(&modify.bearer_cap, |
| TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1); |
| |
| /* Create a copy of the bearer capability |
| * in the transaction struct, so we can use |
| * this information later */ |
| memcpy(&trans->bearer_cap,&modify.bearer_cap, |
| sizeof(trans->bearer_cap)); |
| } |
| |
| new_cc_state(trans, GSM_CSTATE_MO_ORIG_MODIFY); |
| |
| return mncc_recvmsg(trans->net, trans, MNCC_MODIFY_IND, &modify); |
| } |
| |
| static int gsm48_cc_tx_modify(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *modify = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC MOD"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_MODIFY; |
| |
| gsm48_start_cc_timer(trans, 0x323, GSM48_T323); |
| |
| /* bearer capability */ |
| gsm48_encode_bearer_cap(msg, 1, &modify->bearer_cap); |
| memcpy(&trans->bearer_cap, &modify->bearer_cap, sizeof(trans->bearer_cap)); |
| |
| new_cc_state(trans, GSM_CSTATE_MO_TERM_MODIFY); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_rx_modify_complete(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| struct tlv_parsed tp; |
| struct gsm_mncc modify; |
| |
| gsm48_stop_cc_timer(trans); |
| |
| memset(&modify, 0, sizeof(struct gsm_mncc)); |
| modify.callref = trans->callref; |
| tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_BEARER_CAP, 0); |
| /* bearer capability */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) { |
| modify.fields |= MNCC_F_BEARER_CAP; |
| gsm48_decode_bearer_cap(&modify.bearer_cap, |
| TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1); |
| |
| /* Create a copy of the bearer capability |
| * in the transaction struct, so we can use |
| * this information later */ |
| memcpy(&trans->bearer_cap,&modify.bearer_cap, |
| sizeof(trans->bearer_cap)); |
| } |
| |
| new_cc_state(trans, GSM_CSTATE_ACTIVE); |
| |
| return mncc_recvmsg(trans->net, trans, MNCC_MODIFY_CNF, &modify); |
| } |
| |
| static int gsm48_cc_tx_modify_complete(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *modify = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC MOD COMPL"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_MODIFY_COMPL; |
| |
| /* bearer capability */ |
| gsm48_encode_bearer_cap(msg, 1, &modify->bearer_cap); |
| memcpy(&trans->bearer_cap, &modify->bearer_cap, sizeof(trans->bearer_cap)); |
| |
| new_cc_state(trans, GSM_CSTATE_ACTIVE); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_rx_modify_reject(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| struct tlv_parsed tp; |
| struct gsm_mncc modify; |
| |
| gsm48_stop_cc_timer(trans); |
| |
| memset(&modify, 0, sizeof(struct gsm_mncc)); |
| modify.callref = trans->callref; |
| tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_BEARER_CAP, GSM48_IE_CAUSE); |
| /* bearer capability */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) { |
| modify.fields |= GSM48_IE_BEARER_CAP; |
| gsm48_decode_bearer_cap(&modify.bearer_cap, |
| TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1); |
| |
| /* Create a copy of the bearer capability |
| * in the transaction struct, so we can use |
| * this information later */ |
| memcpy(&trans->bearer_cap,&modify.bearer_cap, |
| sizeof(trans->bearer_cap)); |
| } |
| /* cause */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) { |
| modify.fields |= MNCC_F_CAUSE; |
| gsm48_decode_cause(&modify.cause, |
| TLVP_VAL(&tp, GSM48_IE_CAUSE)-1); |
| } |
| |
| new_cc_state(trans, GSM_CSTATE_ACTIVE); |
| |
| return mncc_recvmsg(trans->net, trans, MNCC_MODIFY_REJ, &modify); |
| } |
| |
| static int gsm48_cc_tx_modify_reject(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *modify = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC MOD REJ"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_MODIFY_REJECT; |
| |
| /* bearer capability */ |
| gsm48_encode_bearer_cap(msg, 1, &modify->bearer_cap); |
| memcpy(&trans->bearer_cap, &modify->bearer_cap, sizeof(trans->bearer_cap)); |
| /* cause */ |
| gsm48_encode_cause(msg, 1, &modify->cause); |
| |
| new_cc_state(trans, GSM_CSTATE_ACTIVE); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_tx_notify(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *notify = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC NOT"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_NOTIFY; |
| |
| /* notify */ |
| gsm48_encode_notify(msg, notify->notify); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_rx_notify(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| // struct tlv_parsed tp; |
| struct gsm_mncc notify; |
| |
| memset(¬ify, 0, sizeof(struct gsm_mncc)); |
| notify.callref = trans->callref; |
| // tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len); |
| if (payload_len >= 1) |
| gsm48_decode_notify(¬ify.notify, gh->data); |
| |
| return mncc_recvmsg(trans->net, trans, MNCC_NOTIFY_IND, ¬ify); |
| } |
| |
| static int gsm48_cc_tx_userinfo(struct gsm_trans *trans, void *arg) |
| { |
| struct gsm_mncc *user = arg; |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 USR INFO"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->msg_type = GSM48_MT_CC_USER_INFO; |
| |
| /* user-user */ |
| if (user->fields & MNCC_F_USERUSER) |
| gsm48_encode_useruser(msg, 1, &user->useruser); |
| /* more data */ |
| if (user->more) |
| gsm48_encode_more(msg); |
| |
| return trans_tx_gsm48(trans, msg); |
| } |
| |
| static int gsm48_cc_rx_userinfo(struct gsm_trans *trans, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| struct tlv_parsed tp; |
| struct gsm_mncc user; |
| |
| memset(&user, 0, sizeof(struct gsm_mncc)); |
| user.callref = trans->callref; |
| tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_USER_USER, 0); |
| /* user-user */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) { |
| user.fields |= MNCC_F_USERUSER; |
| gsm48_decode_useruser(&user.useruser, |
| TLVP_VAL(&tp, GSM48_IE_USER_USER)-1); |
| } |
| /* more data */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_MORE_DATA)) |
| user.more = 1; |
| |
| return mncc_recvmsg(trans->net, trans, MNCC_USERINFO_IND, &user); |
| } |
| |
| static int mncc_recv_rtp(struct gsm_network *net, struct gsm_trans *trans, uint32_t callref, |
| int cmd, struct osmo_sockaddr_str *rtp_addr, uint32_t payload_type, |
| uint32_t payload_msg_type, const struct sdp_msg *sdp) |
| { |
| uint8_t data[sizeof(struct gsm_mncc)]; |
| struct gsm_mncc_rtp *rtp; |
| |
| memset(&data, 0, sizeof(data)); |
| rtp = (struct gsm_mncc_rtp *) &data[0]; |
| |
| rtp->callref = callref; |
| rtp->msg_type = cmd; |
| if (rtp_addr) { |
| if (osmo_sockaddr_str_to_sockaddr(rtp_addr, &rtp->addr) < 0) |
| return -EINVAL; |
| } |
| rtp->payload_type = payload_type; |
| rtp->payload_msg_type = payload_msg_type; |
| if (sdp) |
| sdp_msg_to_sdp_str_buf(rtp->sdp, sizeof(rtp->sdp), sdp); |
| return mncc_recvmsg(net, trans, cmd, (struct gsm_mncc *)data); |
| } |
| |
| static void mncc_recv_rtp_err(struct gsm_network *net, struct gsm_trans *trans, uint32_t callref, int cmd) |
| { |
| mncc_recv_rtp(net, trans, callref, cmd, NULL, 0, 0, NULL); |
| } |
| |
| static int tch_rtp_create(struct gsm_network *net, const struct gsm_mncc_rtp *rtp) |
| { |
| struct gsm_trans *trans; |
| |
| /* Find callref */ |
| trans = trans_find_by_callref(net, TRANS_CC, rtp->callref); |
| if (!trans) { |
| LOG_TRANS_CAT(trans, DMNCC, LOGL_ERROR, "RTP create for non-existing trans\n"); |
| mncc_recv_rtp_err(net, trans, rtp->callref, MNCC_RTP_CREATE); |
| return -EIO; |
| } |
| log_set_context(LOG_CTX_VLR_SUBSCR, trans->vsub); |
| if (!trans->msc_a) { |
| LOG_TRANS_CAT(trans, DMNCC, LOGL_NOTICE, "RTP create for trans without conn\n"); |
| mncc_recv_rtp_err(net, trans, rtp->callref, MNCC_RTP_CREATE); |
| return 0; |
| } |
| log_mncc_rx_tx(trans, "rx", (const union mncc_msg *)rtp); |
| |
| /* Assign call (if not done yet) */ |
| return msc_a_try_call_assignment(trans); |
| } |
| |
| int cc_on_cn_local_rtp_port_known(struct gsm_trans *cc_trans) |
| { |
| /* Depending on MO or MT call, dispatch the event differently */ |
| switch (cc_trans->cc.state) { |
| case GSM_CSTATE_INITIATED: |
| if (cc_trans->cc.msg.msg_type != MNCC_SETUP_IND) { |
| LOG_TRANS(cc_trans, LOGL_ERROR, "Assuming MO call, expected MNCC_SETUP_IND to be prepared\n"); |
| return -EINVAL; |
| } |
| /* This is the MO call leg, waiting for a CN RTP be able to send initial MNCC_SETUP_IND. */ |
| gsm48_cc_rx_setup_cn_local_rtp_port_known(cc_trans); |
| return 0; |
| |
| case GSM_CSTATE_MO_TERM_CALL_CONF: |
| /* This is the MT call leg, waiting for a CN RTP to be able to send MNCC_CALL_CONF_IND. */ |
| return gsm48_cc_mt_rtp_port_and_codec_known(cc_trans); |
| |
| default: |
| LOG_TRANS(cc_trans, LOGL_ERROR, "CN RTP address available, but in unexpected state %d\n", |
| cc_trans->cc.state); |
| return -EINVAL; |
| } |
| } |
| |
| int cc_on_assignment_done(struct gsm_trans *trans) |
| { |
| struct msc_a *msc_a = trans->msc_a; |
| |
| switch (trans->cc.state) { |
| case GSM_CSTATE_INITIATED: |
| case GSM_CSTATE_MO_CALL_PROC: |
| /* MO call, send ACK in form of an MNCC_RTP_CREATE (below) */ |
| break; |
| |
| case GSM_CSTATE_CALL_RECEIVED: |
| case GSM_CSTATE_MO_TERM_CALL_CONF: |
| /* MT call, send ACK in form of an MNCC_RTP_CREATE (below) */ |
| break; |
| |
| case GSM_CSTATE_ACTIVE: |
| /* already active. We decided to re-assign later on during the call - at time of writing this never |
| * happens. */ |
| case GSM_CSTATE_CALL_DELIVERED: |
| case GSM_CSTATE_CONNECT_IND: |
| /* MNCC has progressed past the initial assignment. Usually it means that this happened: after |
| * MNCC_ALERT_REQ, MO has triggered a re-assignment, to adjust MO's codec to MT's codec. */ |
| LOG_TRANS(trans, LOGL_DEBUG, "Re-Assignment complete\n"); |
| return 0; |
| |
| default: |
| LOG_TRANS(trans, LOGL_ERROR, "Assignment done in unexpected CC state: %d\n", trans->cc.state); |
| return -EINVAL; |
| } |
| |
| if (!call_leg_local_ip(msc_a->cc.call_leg, RTP_TO_CN)) { |
| LOG_TRANS(trans, LOGL_DEBUG, |
| "Assignment complete, but still waiting for the CRCX OK on the CN side RTP\n"); |
| return 0; |
| } |
| return gsm48_tch_rtp_create(trans); |
| } |
| |
| /* Trigger TCH_RTP_CREATE acknowledgement */ |
| int gsm48_tch_rtp_create(struct gsm_trans *trans) |
| { |
| /* This function is called as soon as the port, on which the |
| * mgcp-gw expects the incoming RTP stream from the remote |
| * end (e.g. Asterisk) is known. */ |
| struct msc_a *msc_a = trans->msc_a; |
| struct gsm_network *net = msc_a_net(msc_a); |
| struct call_leg *cl = msc_a->cc.call_leg; |
| struct osmo_sockaddr_str *rtp_cn_local; |
| struct rtp_stream *rtp_cn = cl ? cl->rtp[RTP_TO_CN] : NULL; |
| int mncc_payload_msg_type; |
| struct sdp_audio_codec *codec; |
| const struct codec_mapping *m; |
| struct sdp_audio_codecs *codecs; |
| |
| if (!rtp_cn) { |
| LOG_TRANS_CAT(trans, DMNCC, LOGL_ERROR, "Cannot RTP CREATE to MNCC, no RTP set up for the CN side\n"); |
| return -EINVAL; |
| } |
| |
| trans_cc_filter_run(trans); |
| codecs = &trans->cc.local.audio_codecs; |
| if (!codecs->count) { |
| LOG_TRANS_CAT(trans, DMNCC, LOGL_ERROR, |
| "Cannot RTP CREATE to MNCC, there is no codec available\n"); |
| return -EINVAL; |
| } |
| |
| /* Populate the legacy MNCC codec elements: payload_type and payload_msg_type */ |
| codec = &codecs->codec[0]; |
| m = codec_mapping_by_subtype_name(codec->subtype_name); |
| mncc_payload_msg_type = m ? m->mncc_payload_msg_type : 0; |
| |
| rtp_cn_local = call_leg_local_ip(cl, RTP_TO_CN); |
| if (!rtp_cn_local) { |
| LOG_TRANS_CAT(trans, DMNCC, LOGL_ERROR, "Cannot RTP CREATE to MNCC, no local RTP IP:port to CN set up\n"); |
| return -EINVAL; |
| } |
| |
| return mncc_recv_rtp(net, trans, trans->callref, MNCC_RTP_CREATE, rtp_cn_local, |
| codec->payload_type, mncc_payload_msg_type, &trans->cc.local); |
| } |
| |
| static int tch_rtp_connect(struct gsm_network *net, const struct gsm_mncc_rtp *rtp) |
| { |
| struct gsm_trans *trans; |
| struct call_leg *cl; |
| struct rtp_stream *rtps; |
| |
| /* Find callref */ |
| trans = trans_find_by_callref(net, TRANS_CC, rtp->callref); |
| if (!trans) { |
| LOG_TRANS_CAT(trans, DMNCC, LOGL_ERROR, "RTP connect for non-existing trans\n"); |
| mncc_recv_rtp_err(net, trans, rtp->callref, MNCC_RTP_CONNECT); |
| return -EIO; |
| } |
| log_set_context(LOG_CTX_VLR_SUBSCR, trans->vsub); |
| if (!trans->msc_a) { |
| LOG_TRANS_CAT(trans, DMNCC, LOGL_ERROR, "RTP connect for trans without conn\n"); |
| mncc_recv_rtp_err(net, trans, rtp->callref, MNCC_RTP_CONNECT); |
| return -EIO; |
| } |
| |
| log_mncc_rx_tx(trans, "rx", (const union mncc_msg *)rtp); |
| |
| rx_mncc_sdp(trans, rtp->msg_type, rtp->sdp, NULL); |
| |
| cl = trans->msc_a->cc.call_leg; |
| rtps = cl ? cl->rtp[RTP_TO_CN] : NULL; |
| if (rtps && !osmo_sockaddr_str_is_nonzero(&rtps->remote)) { |
| /* Didn't get an IP address from SDP. Try legacy MNCC IP address */ |
| struct osmo_sockaddr_str rtp_addr; |
| if (osmo_sockaddr_str_from_sockaddr(&rtp_addr, &rtp->addr) < 0) { |
| LOG_TRANS_CAT(trans, DMNCC, LOGL_ERROR, "RTP connect with invalid IP addr\n"); |
| mncc_recv_rtp_err(net, trans, rtp->callref, MNCC_RTP_CONNECT); |
| return -EINVAL; |
| } |
| rtp_stream_set_remote_addr(rtps, &rtp_addr); |
| rtp_stream_commit(rtps); |
| } |
| return 0; |
| } |
| |
| static struct downstate { |
| uint32_t states; |
| int type; |
| int (*rout) (struct gsm_trans *trans, void *arg); |
| } downstatelist[] = { |
| /* mobile originating call establishment */ |
| {SBIT(GSM_CSTATE_INITIATED), /* 5.2.1.2 */ |
| MNCC_CALL_PROC_REQ, gsm48_cc_tx_call_proc_and_assign}, |
| {SBIT(GSM_CSTATE_INITIATED) | SBIT(GSM_CSTATE_MO_CALL_PROC), /* 5.2.1.2 | 5.2.1.5 */ |
| MNCC_ALERT_REQ, gsm48_cc_tx_alerting}, |
| {SBIT(GSM_CSTATE_INITIATED) | SBIT(GSM_CSTATE_MO_CALL_PROC) | SBIT(GSM_CSTATE_CALL_DELIVERED), /* 5.2.1.2 | 5.2.1.6 | 5.2.1.6 */ |
| MNCC_SETUP_RSP, gsm48_cc_tx_connect}, |
| {SBIT(GSM_CSTATE_MO_CALL_PROC), /* 5.2.1.4.2 */ |
| MNCC_PROGRESS_REQ, gsm48_cc_tx_progress}, |
| /* mobile terminating call establishment */ |
| {SBIT(GSM_CSTATE_NULL), /* 5.2.2.1 */ |
| MNCC_SETUP_REQ, gsm48_cc_tx_setup}, |
| {SBIT(GSM_CSTATE_CONNECT_REQUEST), |
| MNCC_SETUP_COMPL_REQ, gsm48_cc_tx_connect_ack}, |
| /* signalling during call */ |
| {SBIT(GSM_CSTATE_ACTIVE), |
| MNCC_NOTIFY_REQ, gsm48_cc_tx_notify}, |
| {ALL_STATES - SBIT(GSM_CSTATE_NULL) - SBIT(GSM_CSTATE_RELEASE_REQ), |
| MNCC_FACILITY_REQ, gsm48_cc_tx_facility}, |
| {ALL_STATES, |
| MNCC_START_DTMF_RSP, gsm48_cc_tx_start_dtmf_ack}, |
| {ALL_STATES, |
| MNCC_START_DTMF_REJ, gsm48_cc_tx_start_dtmf_rej}, |
| {ALL_STATES, |
| MNCC_STOP_DTMF_RSP, gsm48_cc_tx_stop_dtmf_ack}, |
| {SBIT(GSM_CSTATE_ACTIVE), |
| MNCC_HOLD_CNF, gsm48_cc_tx_hold_ack}, |
| {SBIT(GSM_CSTATE_ACTIVE), |
| MNCC_HOLD_REJ, gsm48_cc_tx_hold_rej}, |
| {SBIT(GSM_CSTATE_ACTIVE), |
| MNCC_RETRIEVE_CNF, gsm48_cc_tx_retrieve_ack}, |
| {SBIT(GSM_CSTATE_ACTIVE), |
| MNCC_RETRIEVE_REJ, gsm48_cc_tx_retrieve_rej}, |
| {SBIT(GSM_CSTATE_ACTIVE), |
| MNCC_MODIFY_REQ, gsm48_cc_tx_modify}, |
| {SBIT(GSM_CSTATE_MO_ORIG_MODIFY), |
| MNCC_MODIFY_RSP, gsm48_cc_tx_modify_complete}, |
| {SBIT(GSM_CSTATE_MO_ORIG_MODIFY), |
| MNCC_MODIFY_REJ, gsm48_cc_tx_modify_reject}, |
| {SBIT(GSM_CSTATE_ACTIVE), |
| MNCC_USERINFO_REQ, gsm48_cc_tx_userinfo}, |
| /* clearing */ |
| {SBIT(GSM_CSTATE_INITIATED), |
| MNCC_REJ_REQ, gsm48_cc_tx_release_compl}, |
| {ALL_STATES - SBIT(GSM_CSTATE_NULL) - SBIT(GSM_CSTATE_DISCONNECT_IND) - SBIT(GSM_CSTATE_RELEASE_REQ) - SBIT(GSM_CSTATE_DISCONNECT_REQ), /* 5.4.4 */ |
| MNCC_DISC_REQ, gsm48_cc_tx_disconnect}, |
| {ALL_STATES - SBIT(GSM_CSTATE_NULL) - SBIT(GSM_CSTATE_RELEASE_REQ), /* 5.4.3.2 */ |
| MNCC_REL_REQ, gsm48_cc_tx_release}, |
| }; |
| |
| #define DOWNSLLEN \ |
| (sizeof(downstatelist) / sizeof(struct downstate)) |
| |
| |
| static int mncc_tx_to_gsm_cc(struct gsm_network *net, const union mncc_msg *msg) |
| { |
| int i, rc = 0; |
| struct msc_a *msc_a = NULL; |
| struct gsm_trans *trans = NULL; |
| const struct gsm_mncc *data; |
| |
| /* handle special messages */ |
| switch(msg->msg_type) { |
| case MNCC_BRIDGE: |
| rc = tch_bridge(net, &msg->bridge); |
| if (rc < 0) |
| disconnect_bridge(net, &msg->bridge, -rc); |
| return rc; |
| case MNCC_RTP_CREATE: |
| return tch_rtp_create(net, &msg->rtp); |
| case MNCC_RTP_CONNECT: |
| return tch_rtp_connect(net, &msg->rtp); |
| case MNCC_RTP_FREE: |
| /* unused right now */ |
| return -EIO; |
| |
| case MNCC_FRAME_DROP: |
| case MNCC_FRAME_RECV: |
| case GSM_TCHF_FRAME: |
| case GSM_TCHF_FRAME_EFR: |
| case GSM_TCHH_FRAME: |
| case GSM_TCH_FRAME_AMR: |
| LOG_TRANS_CAT(trans, DMNCC, LOGL_ERROR, "RTP streams must be handled externally; %s not supported.\n", |
| get_mncc_name(msg->msg_type)); |
| return -ENOTSUP; |
| } |
| |
| data = &msg->signal; |
| |
| /* Find callref */ |
| trans = trans_find_by_callref(net, TRANS_CC, data->callref); |
| |
| /* Callref unknown */ |
| if (!trans) { |
| struct vlr_subscr *vsub; |
| |
| if (msg->msg_type != MNCC_SETUP_REQ) { |
| LOG_TRANS_CAT(trans, DCC, LOGL_ERROR, "Unknown call reference for %s\n", |
| get_mncc_name(msg->msg_type)); |
| /* Invalid call reference */ |
| return mncc_release_ind(net, NULL, data->callref, |
| GSM48_CAUSE_LOC_PRN_S_LU, |
| GSM48_CC_CAUSE_INVAL_TRANS_ID); |
| } |
| if (!data->called.number[0] && !data->imsi[0]) { |
| LOG_TRANS_CAT(trans, DCC, LOGL_ERROR, "Neither number nor IMSI in %s\n", |
| get_mncc_name(msg->msg_type)); |
| /* Invalid number */ |
| return mncc_release_ind(net, NULL, data->callref, |
| GSM48_CAUSE_LOC_PRN_S_LU, |
| GSM48_CC_CAUSE_INV_NR_FORMAT); |
| } |
| /* New transaction due to setup, find subscriber */ |
| if (data->called.number[0]) { |
| vsub = vlr_subscr_find_by_msisdn(net->vlr, data->called.number, __func__); |
| if (!vsub) |
| LOG_TRANS_CAT(trans, DCC, LOGL_ERROR, "rx %s for unknown subscriber number '%s'\n", |
| get_mncc_name(msg->msg_type), data->called.number); |
| } else { |
| vsub = vlr_subscr_find_by_imsi(net->vlr, data->imsi, __func__); |
| if (!vsub) |
| LOG_TRANS_CAT(trans, DCC, LOGL_ERROR, "rx %s for unknown subscriber IMSI '%s'\n", |
| get_mncc_name(msg->msg_type), data->imsi); |
| } |
| if (!vsub) |
| return mncc_release_ind(net, NULL, data->callref, GSM48_CAUSE_LOC_PRN_S_LU, |
| GSM48_CC_CAUSE_USER_NOTRESPOND); |
| /* update the subscriber we deal with */ |
| log_set_context(LOG_CTX_VLR_SUBSCR, vsub); |
| |
| /* If subscriber is not "attached" */ |
| if (!vsub->lu_complete) { |
| LOG_TRANS_CAT(trans, DCC, LOGL_ERROR, "rx %s for subscriber that is not attached: %s\n", |
| get_mncc_name(msg->msg_type), vlr_subscr_name(vsub)); |
| vlr_subscr_put(vsub, __func__); |
| /* Temporarily out of order */ |
| return mncc_release_ind(net, NULL, data->callref, |
| GSM48_CAUSE_LOC_PRN_S_LU, |
| GSM48_CC_CAUSE_DEST_OOO); |
| } |
| |
| /* Find valid conn */ |
| msc_a = msc_a_for_vsub(vsub, true); |
| |
| /* If subscriber is BUSY and we do not DO call in call aka "call-waiting" */ |
| if (!net->call_waiting && msc_a) { |
| struct gsm_trans *existing_cc_trans = trans_find_by_type(msc_a, TRANS_CC); |
| if (existing_cc_trans && existing_cc_trans->cc.state != GSM_CSTATE_NULL) { |
| LOG_TRANS_CAT(existing_cc_trans, DCC, LOGL_NOTICE, |
| "rx '%s' for subscriber %s with trans state (%s)" |
| " rejecting with USER_BUSY\n", |
| get_mncc_name(msg->msg_type), data->called.number, |
| gsm48_cc_state_name(existing_cc_trans->cc.state)); |
| return mncc_release_ind(net, NULL, data->callref, |
| GSM48_CAUSE_LOC_PRN_S_LU, |
| GSM48_CC_CAUSE_USER_BUSY); |
| } |
| } |
| |
| /* Create transaction */ |
| trans = trans_alloc(net, vsub, TRANS_CC, |
| TRANS_ID_UNASSIGNED, data->callref); |
| if (!trans) { |
| LOG_TRANS(trans, LOGL_ERROR, "No memory for trans.\n"); |
| vlr_subscr_put(vsub, __func__); |
| /* Resource unavailable */ |
| mncc_release_ind(net, NULL, data->callref, |
| GSM48_CAUSE_LOC_PRN_S_LU, |
| GSM48_CC_CAUSE_RESOURCE_UNAVAIL); |
| return -ENOMEM; |
| } |
| |
| /* Remember remote SDP, if any */ |
| rx_mncc_sdp(trans, data->msg_type, data->sdp, |
| (data->fields & MNCC_F_BEARER_CAP) ? &data->bearer_cap : NULL); |
| |
| /* If subscriber has no conn */ |
| if (!msc_a) { |
| /* This condition will return before the common logging of the received MNCC message below, so |
| * log it now. */ |
| log_mncc_rx_tx(trans, "rx", msg); |
| |
| /* store setup information until paging succeeds */ |
| memcpy(&trans->cc.msg, data, sizeof(struct gsm_mncc)); |
| |
| /* Request a channel. If Paging already started, paging_request_start() will append the new |
| * trans to the already ongoing Paging. */ |
| trans->paging_request = paging_request_start(vsub, PAGING_CAUSE_CALL_CONVERSATIONAL, |
| cc_paging_cb, trans, "MNCC: establish call"); |
| if (!trans->paging_request) { |
| LOG_TRANS(trans, LOGL_ERROR, "Failed to allocate paging token.\n"); |
| trans_free(trans); |
| } |
| vlr_subscr_put(vsub, __func__); |
| return 0; |
| } |
| |
| /* Assign conn */ |
| trans->msc_a = msc_a; |
| msc_a_get(msc_a, MSC_A_USE_CC); |
| trans->dlci = 0x00; /* SAPI=0, not SACCH */ |
| vlr_subscr_put(vsub, __func__); |
| } else { |
| /* update the subscriber we deal with */ |
| log_set_context(LOG_CTX_VLR_SUBSCR, trans->vsub); |
| } |
| |
| log_mncc_rx_tx(trans, "rx", msg); |
| |
| /* |
| * The step of gsm48_start_guard_timer() needs to be done for |
| * major state-impacting MNCC messages, but not for those |
| * that are a mere pass-through to CC messages to MS. |
| */ |
| switch (msg->msg_type) { |
| case MNCC_PROGRESS_REQ: |
| case MNCC_NOTIFY_REQ: |
| case MNCC_FACILITY_REQ: |
| case MNCC_START_DTMF_RSP: |
| case MNCC_START_DTMF_REJ: |
| case MNCC_STOP_DTMF_RSP: |
| case MNCC_HOLD_CNF: |
| case MNCC_HOLD_REJ: |
| case MNCC_RETRIEVE_CNF: |
| case MNCC_RETRIEVE_REJ: |
| case MNCC_USERINFO_REQ: |
| break; |
| default: |
| gsm48_start_guard_timer(trans); |
| } |
| trans->cc.mncc_initiated = true; |
| |
| if (trans->msc_a) |
| msc_a = trans->msc_a; |
| |
| /* if paging did not respond yet */ |
| if (!msc_a) { |
| struct gsm_mncc rel = { |
| .callref = data->callref, |
| }; |
| LOG_TRANS(trans, LOGL_DEBUG, "still paging\n"); |
| mncc_set_cause(&rel, GSM48_CAUSE_LOC_PRN_S_LU, |
| GSM48_CC_CAUSE_NORM_CALL_CLEAR); |
| if (msg->msg_type == MNCC_REL_REQ) |
| rc = mncc_recvmsg(net, trans, MNCC_REL_CNF, &rel); |
| else |
| rc = mncc_recvmsg(net, trans, MNCC_REL_IND, &rel); |
| trans->callref = 0; |
| trans_free(trans); |
| return rc; |
| } |
| |
| /* Find function for current state and message */ |
| for (i = 0; i < DOWNSLLEN; i++) |
| if ((msg->msg_type == downstatelist[i].type) |
| && ((1 << trans->cc.state) & downstatelist[i].states)) |
| break; |
| if (i == DOWNSLLEN) { |
| LOG_TRANS(trans, LOGL_DEBUG, "Message '%s' unhandled at state '%s'\n", |
| get_mncc_name(msg->msg_type), gsm48_cc_state_name(trans->cc.state)); |
| return 0; |
| } |
| |
| rc = downstatelist[i].rout(trans, (void*)msg); |
| |
| return rc; |
| } |
| |
| struct mncc_call *mncc_find_by_callref_from_msg(const union mncc_msg *msg) |
| { |
| uint32_t callref; |
| |
| switch (msg->msg_type) { |
| case MNCC_BRIDGE: |
| callref = msg->bridge.callref[0]; |
| break; |
| case MNCC_RTP_CREATE: |
| case MNCC_RTP_CONNECT: |
| callref = msg->rtp.callref; |
| break; |
| |
| case MNCC_RTP_FREE: |
| case MNCC_FRAME_DROP: |
| case MNCC_FRAME_RECV: |
| case GSM_TCHF_FRAME: |
| case GSM_TCHF_FRAME_EFR: |
| case GSM_TCHH_FRAME: |
| case GSM_TCH_FRAME_AMR: |
| return NULL; |
| |
| default: |
| callref = msg->signal.callref; |
| break; |
| } |
| |
| return mncc_call_find_by_callref(callref); |
| } |
| |
| /* Demux incoming genuine calls to GSM CC from MNCC forwarding for inter-MSC handover */ |
| int mncc_tx_to_cc(struct gsm_network *net, void *arg) |
| { |
| const union mncc_msg *msg = arg; |
| struct mncc_call *mncc_call = NULL; |
| |
| if (msg->msg_type == MNCC_SETUP_REQ) { |
| /* Incoming call to forward for inter-MSC Handover? */ |
| mncc_call = msc_t_check_call_to_handover_number(&msg->signal); |
| if (mncc_call) |
| LOG_MNCC_CALL(mncc_call, LOGL_DEBUG, |
| "Incoming call matches pending inter-MSC Handover Number\n"); |
| } |
| if (!mncc_call) { |
| /* Find already active MNCC FSM for this callref. |
| * Currently only for inter-MSC call forwarding, but mncc_fsm could at some point also be used for direct |
| * MNCC<->GSM-CC call handling. */ |
| mncc_call = mncc_find_by_callref_from_msg(msg); |
| } |
| if (mncc_call) { |
| mncc_call_rx(mncc_call, msg); |
| return 0; |
| } |
| |
| /* None of the above? Then it must be a normal GSM CC call related message. */ |
| return mncc_tx_to_gsm_cc(net, msg); |
| } |
| |
| static struct datastate { |
| uint32_t states; |
| int type; |
| int (*rout) (struct gsm_trans *trans, struct msgb *msg); |
| } datastatelist[] = { |
| /* mobile originating call establishment */ |
| {SBIT(GSM_CSTATE_NULL), /* 5.2.1.2 */ |
| GSM48_MT_CC_SETUP, gsm48_cc_rx_setup}, |
| {SBIT(GSM_CSTATE_NULL), /* 5.2.1.2 */ |
| GSM48_MT_CC_EMERG_SETUP, gsm48_cc_rx_setup}, |
| {SBIT(GSM_CSTATE_CONNECT_IND), /* 5.2.1.2 */ |
| GSM48_MT_CC_CONNECT_ACK, gsm48_cc_rx_connect_ack}, |
| /* mobile terminating call establishment */ |
| {SBIT(GSM_CSTATE_CALL_PRESENT), /* 5.2.2.3.2 */ |
| GSM48_MT_CC_CALL_CONF, gsm48_cc_rx_call_conf}, |
| {SBIT(GSM_CSTATE_CALL_PRESENT) | SBIT(GSM_CSTATE_MO_TERM_CALL_CONF), /* ???? | 5.2.2.3.2 */ |
| GSM48_MT_CC_ALERTING, gsm48_cc_rx_alerting}, |
| {SBIT(GSM_CSTATE_CALL_PRESENT) | SBIT(GSM_CSTATE_MO_TERM_CALL_CONF) | SBIT(GSM_CSTATE_CALL_RECEIVED), /* (5.2.2.6) | 5.2.2.6 | 5.2.2.6 */ |
| GSM48_MT_CC_CONNECT, gsm48_cc_rx_connect}, |
| /* signalling during call */ |
| {ALL_STATES - SBIT(GSM_CSTATE_NULL), |
| GSM48_MT_CC_FACILITY, gsm48_cc_rx_facility}, |
| {SBIT(GSM_CSTATE_ACTIVE), |
| GSM48_MT_CC_NOTIFY, gsm48_cc_rx_notify}, |
| {ALL_STATES, |
| GSM48_MT_CC_START_DTMF, gsm48_cc_rx_start_dtmf}, |
| {ALL_STATES, |
| GSM48_MT_CC_STOP_DTMF, gsm48_cc_rx_stop_dtmf}, |
| {ALL_STATES, |
| GSM48_MT_CC_STATUS_ENQ, gsm48_cc_rx_status_enq}, |
| {SBIT(GSM_CSTATE_ACTIVE), |
| GSM48_MT_CC_HOLD, gsm48_cc_rx_hold}, |
| {SBIT(GSM_CSTATE_ACTIVE), |
| GSM48_MT_CC_RETR, gsm48_cc_rx_retrieve}, |
| {SBIT(GSM_CSTATE_ACTIVE), |
| GSM48_MT_CC_MODIFY, gsm48_cc_rx_modify}, |
| {SBIT(GSM_CSTATE_MO_TERM_MODIFY), |
| GSM48_MT_CC_MODIFY_COMPL, gsm48_cc_rx_modify_complete}, |
| {SBIT(GSM_CSTATE_MO_TERM_MODIFY), |
| GSM48_MT_CC_MODIFY_REJECT, gsm48_cc_rx_modify_reject}, |
| {SBIT(GSM_CSTATE_ACTIVE), |
| GSM48_MT_CC_USER_INFO, gsm48_cc_rx_userinfo}, |
| /* clearing */ |
| {ALL_STATES - SBIT(GSM_CSTATE_NULL) - SBIT(GSM_CSTATE_RELEASE_REQ), /* 5.4.3.2 */ |
| GSM48_MT_CC_DISCONNECT, gsm48_cc_rx_disconnect}, |
| {ALL_STATES - SBIT(GSM_CSTATE_NULL), /* 5.4.4.1.2.2 */ |
| GSM48_MT_CC_RELEASE, gsm48_cc_rx_release}, |
| {ALL_STATES, /* 5.4.3.4 */ |
| GSM48_MT_CC_RELEASE_COMPL, gsm48_cc_rx_release_compl}, |
| }; |
| |
| #define DATASLLEN \ |
| (sizeof(datastatelist) / sizeof(struct datastate)) |
| |
| int gsm0408_rcv_cc(struct msc_a *msc_a, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| uint8_t msg_type = gsm48_hdr_msg_type(gh); |
| uint8_t transaction_id = gsm48_hdr_trans_id_flip_ti(gh); |
| struct gsm_trans *trans = NULL; |
| struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| struct gsm_network *net = msc_a_net(msc_a); |
| int i, rc = 0; |
| |
| if (msg_type & 0x80) { |
| LOG_TRANS(trans, LOGL_DEBUG, "MSG 0x%2x not defined for PD error\n", msg_type); |
| return -EINVAL; |
| } |
| |
| if (!vsub) { |
| LOG_TRANS(trans, LOGL_ERROR, "Invalid conn: no subscriber\n"); |
| return -EINVAL; |
| } |
| |
| /* Find transaction */ |
| trans = trans_find_by_id(msc_a, TRANS_CC, transaction_id); |
| |
| /* Create transaction */ |
| if (!trans) { |
| /* Create transaction */ |
| trans = trans_alloc(net, vsub, |
| TRANS_CC, |
| transaction_id, msc_cc_next_outgoing_callref()); |
| if (!trans) { |
| LOG_TRANS(trans, LOGL_ERROR, "No memory for trans.\n"); |
| rc = gsm48_tx_simple(msc_a, |
| GSM48_PDISC_CC | (transaction_id << 4), |
| GSM48_MT_CC_RELEASE_COMPL); |
| return -ENOMEM; |
| } |
| if (osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_TRANSACTION_ACCEPTED, trans)) { |
| LOG_MSC_A(msc_a, LOGL_ERROR, "Not allowed to accept CC transaction\n"); |
| trans_free(trans); |
| return -EINVAL; |
| } |
| |
| /* Assign transaction */ |
| msc_a_get(msc_a, MSC_A_USE_CC); |
| trans->msc_a = msc_a; |
| trans->dlci = OMSC_LINKID_CB(msg); /* DLCI as received from BSC */ |
| |
| /* An earlier CM Service Request for this CC message now has concluded */ |
| if (!osmo_use_count_by(&msc_a->use_count, MSC_A_USE_CM_SERVICE_CC)) |
| LOG_MSC_A(msc_a, LOGL_ERROR, |
| "Creating new CC transaction without prior CM Service Request\n"); |
| else |
| msc_a_put(msc_a, MSC_A_USE_CM_SERVICE_CC); |
| } |
| |
| LOG_TRANS(trans, LOGL_DEBUG, "rx %s in state %s\n", gsm48_cc_msg_name(msg_type), |
| gsm48_cc_state_name(trans->cc.state)); |
| |
| /* find function for current state and message */ |
| for (i = 0; i < DATASLLEN; i++) |
| if ((msg_type == datastatelist[i].type) |
| && ((1 << trans->cc.state) & datastatelist[i].states)) |
| break; |
| if (i == DATASLLEN) { |
| LOG_TRANS(trans, LOGL_ERROR, "Message unhandled at this state.\n"); |
| |
| /* If a transaction was just now created, it was a bogus transaction ID, and we need to clean up the |
| * transaction right away. */ |
| if (trans->cc.state == GSM_CSTATE_NULL) { |
| LOG_TRANS(trans, LOGL_ERROR, "Unknown transaction ID for non-SETUP message is not allowed" |
| " -- disarding new CC transaction right away\n"); |
| trans_free(trans); |
| } |
| return 0; |
| } |
| |
| assert(trans->vsub); |
| |
| rc = datastatelist[i].rout(trans, msg); |
| |
| return rc; |
| } |