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osmo-msc/src/libmsc/gsm_04_08_cc.c

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/* 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/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/codec_sdp_cc_t9n.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 */
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;
}
}
static int mncc_recvmsg(struct gsm_network *net, struct gsm_trans *trans,
int msg_type, struct gsm_mncc *mncc)
{
struct msgb *msg;
unsigned char *data;
LOG_TRANS_CAT(trans, DMNCC, LOGL_DEBUG, "tx %s\n", get_mncc_name(msg_type));
mncc->msg_type = msg_type;
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,
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, bridge->callref[0]);
struct gsm_trans *trans2 = trans_find_by_callref(net, 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->callref, trans1, cl2, trans2->callref, 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, bridge->callref[0]);
struct gsm_trans *trans1 = trans_find_by_callref(net, 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: */
codec_filter_init(&trans->cc.codecs);
codec_filter_set_ran(&trans->cc.codecs, trans->msc_a->c.ran->type);
codec_filter_set_bss(&trans->cc.codecs, &trans->msc_a->cc.compl_l3_codec_list_bss_supported);
if (setup.fields & MNCC_F_BEARER_CAP)
codec_filter_set_ms_from_bc(&trans->cc.codecs, &trans->bearer_cap);
codec_filter_run(&trans->cc.codecs);
LOG_TRANS(trans, setup.emergency ? LOGL_NOTICE : LOGL_INFO, "%sSETUP to %s\n",
setup.emergency ? "EMERGENCY_" : "", setup.called.number);
LOG_TRANS(trans, LOGL_DEBUG, "codecs: %s\n", codec_filter_to_str(&trans->cc.codecs));
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_NULL 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;
}
codec_filter_set_local_rtp(&trans->cc.codecs, rtp_cn_local);
codec_filter_run(&trans->cc.codecs);
sdp = trans->cc.codecs.result.audio_codecs.count ? &trans->cc.codecs.result : 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 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;
/* 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 must not pass bearer_cap to codec_filter_init(), because 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. */
codec_filter_init(&trans->cc.codecs);
codec_filter_set_ran(&trans->cc.codecs, trans->msc_a->c.ran->type);
codec_filter_set_bss(&trans->cc.codecs, &trans->msc_a->cc.compl_l3_codec_list_bss_supported);
/* sdp.remote: if SDP is included in the MNCC, take that as definitive list of remote audio codecs. */
if (setup->sdp[0]) {
rc = sdp_msg_from_sdp_str(&trans->cc.codecs.remote, setup->sdp);
if (rc)
LOG_TRANS(trans, LOGL_ERROR, "Failed to parse remote call leg SDP: %d\n", rc);
}
/* sdp.remote: if there is no SDP information or we failed to parse it, try using the Bearer Capability from
* MNCC, if any. */
if (!trans->cc.codecs.remote.audio_codecs.count && (setup->fields & MNCC_F_BEARER_CAP)) {
trans->cc.codecs.remote = (struct sdp_msg){};
sdp_audio_codecs_from_bearer_cap(&trans->cc.codecs.remote.audio_codecs,
&setup->bearer_cap);
}
LOG_TRANS(trans, LOGL_DEBUG, "codecs: %s\n", codec_filter_to_str(&trans->cc.codecs));
if (!trans->cc.codecs.remote.audio_codecs.count)
LOG_TRANS(trans, LOGL_ERROR,
"Got no information of remote audio codecs: neither SDP nor Bearer Capability. Trying anyway.\n");
/* Compose outgoing Bearer Capabilities: translate SDP to bearer capability Speech Version entries.
* Send only codecs that remain according to the codec filter. */
/* Create a copy of the bearer capability in the transaction struct, so we
* can use this information later */
codec_filter_run(&trans->cc.codecs);
LOG_TRANS(trans, LOGL_DEBUG, "codecs: %s\n", codec_filter_to_str(&trans->cc.codecs));
bearer_cap = (struct gsm_mncc_bearer_cap){
.speech_ver = { -1 },
};
sdp_audio_codecs_to_bearer_cap(&bearer_cap, &trans->cc.codecs.result.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;
}
/* (As earlier code did, keep a copy in trans->bearer_cap) */
trans->bearer_cap = bearer_cap;
/* If no resulting codecs remain, error out. If the MGW were able to transcode, we would just use unidentical
* codecs on each conn of the MGW endpoint. */
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));
/* 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_free(trans);
msgb_free(msg);
return rc;
}
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));
gsm48_start_cc_timer(trans, 0x303, GSM48_T303);
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. */
codec_filter_set_ms_from_bc(&trans->cc.codecs, &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);
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;
}
codec_filter_set_local_rtp(&trans->cc.codecs, rtp_cn_local);
codec_filter_run(&trans->cc.codecs);
LOG_TRANS(trans, LOGL_DEBUG, "codecs: %s\n", codec_filter_to_str(&trans->cc.codecs));
if (!sdp_audio_codec_is_set(&trans->cc.codecs.assignment))
return 0;
return mncc_recv_rtp(msc_a_net(msc_a), trans, trans->callref, MNCC_RTP_CREATE, rtp_cn_local, 0, 0,
&trans->cc.codecs.result);
}
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) {
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);
codec_filter_run(&trans->cc.codecs);
LOG_TRANS(trans, LOGL_DEBUG, "codecs: %s\n", codec_filter_to_str(&trans->cc.codecs));
rc = sdp_msg_to_sdp_str_buf(alerting.sdp, sizeof(alerting.sdp), &trans->cc.codecs.result);
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));
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]) {
struct call_leg *cl = trans->msc_a->cc.call_leg;
struct rtp_stream *rtp_cn = cl ? cl->rtp[RTP_TO_CN] : NULL;
codec_filter_set_remote(&trans->cc.codecs, alerting->sdp);
codec_filter_run(&trans->cc.codecs);
LOG_TRANS(trans, LOGL_DEBUG, "%s codecs: %s\n",
get_mncc_name(alerting->msg_type), codec_filter_to_str(&trans->cc.codecs));
if (rtp_cn) {
rtp_stream_set_remote_addr_and_codecs(rtp_cn, &trans->cc.codecs.remote);
rtp_stream_commit(rtp_cn);
}
}
return trans_tx_gsm48(trans, msg);
}
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);
/* Received an MNCC_SETUP_RSP with the remote leg's SDP information. Apply codec choice. */
if (connect->sdp[0]) {
struct call_leg *cl = trans->msc_a->cc.call_leg;
struct rtp_stream *rtp_cn = cl ? cl->rtp[RTP_TO_CN] : NULL;
sdp_msg_from_sdp_str(&trans->cc.codecs.remote, connect->sdp);
LOG_TRANS(trans, LOGL_DEBUG, "%s codecs: %s\n",
get_mncc_name(connect->msg_type),
codec_filter_to_str(&trans->cc.codecs));
if (rtp_cn) {
rtp_stream_set_remote_addr_and_codecs(rtp_cn, &trans->cc.codecs.remote);
rtp_stream_commit(rtp_cn);
}
}
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));
codec_filter_run(&trans->cc.codecs);
sdp_msg_to_sdp_str_buf(connect.sdp, sizeof(connect.sdp), &trans->cc.codecs.result);
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(&notify, 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(&notify.notify, gh->data);
return mncc_recvmsg(trans->net, trans, MNCC_NOTIFY_IND, &notify);
}
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) {
LOG_TRANS(trans, LOGL_DEBUG, "%s SDP: %s\n", get_mncc_name(rtp->msg_type), sdp_msg_to_str(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, uint32_t callref)
{
struct gsm_trans *trans;
/* Find callref */
trans = trans_find_by_callref(net, callref);
if (!trans) {
LOG_TRANS_CAT(trans, DMNCC, LOGL_ERROR, "RTP create for non-existing trans\n");
mncc_recv_rtp_err(net, trans, 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, callref, MNCC_RTP_CREATE);
return 0;
}
LOG_TRANS_CAT(trans, DMNCC, LOGL_DEBUG, "rx %s\n", get_mncc_name(MNCC_RTP_CREATE));
/* Assign call (if not done yet) */
return msc_a_try_call_assignment(trans);
}
int cc_cn_local_rtp_port_known(struct gsm_trans *cc_trans)
{
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_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 */
break;
case GSM_CSTATE_CALL_RECEIVED:
case GSM_CSTATE_MO_TERM_CALL_CONF:
/* MT call */
break;
case GSM_CSTATE_ACTIVE:
/* already active. MNCC finished before Abis completed the Assignment. */
break;
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;
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;
}
codec_filter_run(&trans->cc.codecs);
LOG_TRANS(trans, LOGL_DEBUG, "codecs: %s\n", codec_filter_to_str(&trans->cc.codecs));
if (!trans->cc.codecs.result.audio_codecs.count) {
LOG_TRANS_CAT(trans, DMNCC, LOGL_ERROR,
"Cannot RTP CREATE to MNCC, there is no codec available\n");
return -EINVAL;
}
/* Modify the MGW endpoint if necessary, usually this should already match and not cause MGCP. */
rtp_stream_set_codecs(rtp_cn, &trans->cc.codecs.result.audio_codecs);
rtp_stream_commit(rtp_cn);
/* Populate the legacy MNCC codec elements: payload_type and payload_msg_type */
codec = &rtp_cn->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 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.codecs.result);
}
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;
char ipbuf[INET6_ADDRSTRLEN];
/* FIXME: in *rtp we should get the codec information of the remote
* leg. We will have to populate trans->conn->rtp.codec_cn with a
* meaningful value based on this information but unfortunately we
* can't do that yet because the mncc API can not signal dynamic
* payload types yet. This must be fixed first. Also there may be
* additional members necessary in trans->conn->rtp because we
* somehow need to deal with dynamic payload types that do not
* comply to 3gpp's assumptions of payload type numbers on the A
* interface. See also related tickets: OS#3399 and OS1683 */
/* Find callref */
trans = trans_find_by_callref(net, 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_TRANS_CAT(trans, DMNCC, LOGL_DEBUG, "rx %s %s:%u\n", get_mncc_name(rtp->msg_type),
osmo_sockaddr_ntop((const struct sockaddr*)&rtp->addr, ipbuf),
osmo_sockaddr_port((const struct sockaddr*)&rtp->addr));
cl = trans->msc_a->cc.call_leg;
rtps = cl ? cl->rtp[RTP_TO_CN] : NULL;
if (!rtps) {
LOG_TRANS_CAT(trans, DMNCC, LOGL_ERROR, "RTP connect for trans without ongoing call\n");
mncc_recv_rtp_err(net, trans, rtp->callref, MNCC_RTP_CONNECT);
return -EINVAL;
}
if (rtp->sdp[0]) {
sdp_msg_from_sdp_str(&trans->cc.codecs.remote, rtp->sdp);
LOG_TRANS(trans, LOGL_DEBUG, "%s contained SDP %s\n",
get_mncc_name(rtp->msg_type),
sdp_msg_to_str(&trans->cc.codecs.remote));
}
rtp_stream_set_remote_addr_and_codecs(rtps, &trans->cc.codecs.remote);
if (!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.callref);
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, 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 */
if (data->sdp[0]) {
if (sdp_msg_from_sdp_str(&trans->cc.codecs.remote, data->sdp)) {
LOG_TRANS(trans, LOGL_ERROR, "Failed to parse incoming SDP: %s\n",
osmo_quote_str(data->sdp, -1));
vlr_subscr_put(vsub, __func__);
mncc_release_ind(net, NULL, data->callref,
GSM48_CAUSE_LOC_PRN_S_LU,
GSM48_CC_CAUSE_NORMAL_UNSPEC);
return -EINVAL;
}
}
/* 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_TRANS_CAT(trans, DMNCC, LOGL_DEBUG, "rx %s\n", get_mncc_name(msg->msg_type));
/* 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_TRANS_CAT(trans, DMNCC, LOGL_DEBUG, "rx %s\n", get_mncc_name(msg->msg_type));
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, "rx %s in paging state\n", get_mncc_name(msg->msg_type));
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;
} else {
LOG_TRANS(trans, LOGL_DEBUG, "rx %s in state %s\n",
get_mncc_name(msg->msg_type), gsm48_cc_state_name(trans->cc.state));
}
/* 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;
}
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