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/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface
* 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */
/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org>
* (C) 2008, 2009, 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2009 by Mike Haben <michael.haben@btinternet.com>
*
* 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 <stdint.h>
#include <errno.h>
#include <osmocom/msc/gsm_04_80.h>
#include <osmocom/msc/msc_ifaces.h>
#include <osmocom/gsm/protocol/gsm_04_80.h>
#include <osmocom/gsm/gsm0480.h>
#include <osmocom/core/msgb.h>
#include <osmocom/gsm/tlv.h>
/*! Send a MT RELEASE COMPLETE message with Reject component
* (see section 3.6.1) and given error code (see section 3.6.7).
*
* \param[in] conn Active RAN connection
* \param[in] transaction_id Transaction ID with TI flag set
* \param[in] invoke_id InvokeID of the request
* \param[in] problem_tag Problem code tag (table 3.13)
* \param[in] problem_code Problem code (tables 3.14-17)
* \return result of \ref msc_tx_dtap
*
* Note: if InvokeID is not available, e.g. when message parsing
* failed, any incorrect value can be passed (0x00 > x > 0xff), so
* the universal NULL-tag (see table 3.6) will be used instead.
*/
int msc_send_ussd_reject(struct ran_conn *conn,
uint8_t transaction_id, int invoke_id,
uint8_t problem_tag, uint8_t problem_code)
{
struct gsm48_hdr *gh;
struct msgb *msg;
msg = gsm0480_gen_reject(invoke_id, problem_tag, problem_code);
if (!msg)
return -1;
/* Wrap the component in a Facility message */
msgb_push_tl(msg, GSM0480_IE_FACILITY);
/* And finally pre-pend the L3 header */
gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh));
gh->proto_discr = GSM48_PDISC_NC_SS;
gh->proto_discr |= transaction_id << 4;
gh->msg_type = GSM0480_MTYPE_RELEASE_COMPLETE;
return msc_tx_dtap(conn, msg);
}
int msc_send_ussd_notify(struct ran_conn *conn, int level, const char *text)
{
struct msgb *msg = gsm0480_create_ussd_notify(level, text);
if (!msg)
return -1;
return msc_tx_dtap(conn, msg);
}
int msc_send_ussd_release_complete(struct ran_conn *conn,
uint8_t transaction_id)
{
struct msgb *msg = gsm0480_create_release_complete(transaction_id);
if (!msg)
return -1;
return msc_tx_dtap(conn, msg);
}
int msc_send_ussd_release_complete_cause(struct ran_conn *conn,
uint8_t transaction_id,
uint8_t cause_loc, uint8_t cause_val)
{
struct msgb *msg;
uint8_t *cause_ie;
msg = gsm0480_create_release_complete(transaction_id);
if (!msg)
return -1;
/* Encode cause IE (see GSM 04.08, section 10.5.4.11)
* with fixed length (2 bytes of TL, 2 bytes of payload).
* NOTE: we don't use gsm48_encode_cause() API because
* it wants gsm_mncc_cause struct from us. */
cause_ie = msgb_put(msg, 2 + 2);
cause_ie[0] = GSM48_IE_CAUSE;
cause_ie[1] = 2;
/* Coding standard defined for the GSM PLMNs,
* location and cause: as given by caller,
* no extension, no diagnostics. */
cause_ie[2] = (1 << 7) | (0x03 << 5) | (cause_loc & 0x0f);
cause_ie[3] = (1 << 7) | cause_val;
return msc_tx_dtap(conn, msg);
}
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