115 lines
3.7 KiB
C
115 lines
3.7 KiB
C
/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface
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* 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */
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/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org>
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* (C) 2008, 2009, 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2009 by Mike Haben <michael.haben@btinternet.com>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <stdint.h>
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#include <errno.h>
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#include <osmocom/msc/gsm_04_80.h>
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#include <osmocom/msc/msc_a.h>
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#include <osmocom/gsm/protocol/gsm_04_80.h>
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#include <osmocom/gsm/gsm0480.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/gsm/tlv.h>
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/*! Send a MT RELEASE COMPLETE message with Reject component
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* (see section 3.6.1) and given error code (see section 3.6.7).
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*
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* \param[in] msc_a Active subscriber
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* \param[in] transaction_id Transaction ID with TI flag set
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* \param[in] invoke_id InvokeID of the request
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* \param[in] problem_tag Problem code tag (table 3.13)
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* \param[in] problem_code Problem code (tables 3.14-17)
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* \return result of \ref msc_tx_dtap
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*
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* Note: if InvokeID is not available, e.g. when message parsing
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* failed, any incorrect value can be passed (0x00 > x > 0xff), so
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* the universal NULL-tag (see table 3.6) will be used instead.
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*/
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int msc_send_ussd_reject(struct msc_a *msc_a, uint8_t transaction_id, int invoke_id,
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uint8_t problem_tag, uint8_t problem_code)
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{
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struct gsm48_hdr *gh;
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struct msgb *msg;
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msg = gsm0480_gen_reject(invoke_id, problem_tag, problem_code);
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if (!msg)
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return -1;
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/* Wrap the component in a Facility message */
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msgb_push_tl(msg, GSM0480_IE_FACILITY);
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/* And finally pre-pend the L3 header */
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gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh));
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gh->proto_discr = GSM48_PDISC_NC_SS;
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gh->proto_discr |= transaction_id << 4;
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gh->msg_type = GSM0480_MTYPE_RELEASE_COMPLETE;
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return msc_a_tx_dtap_to_i(msc_a, msg);
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}
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int msc_send_ussd_notify(struct msc_a *msc_a, int level, const char *text)
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{
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struct msgb *msg = gsm0480_create_ussd_notify(level, text);
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if (!msg)
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return -1;
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return msc_a_tx_dtap_to_i(msc_a, msg);
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}
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int msc_send_ussd_release_complete(struct msc_a *msc_a, uint8_t transaction_id)
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{
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struct msgb *msg = gsm0480_create_release_complete(transaction_id);
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if (!msg)
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return -1;
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return msc_a_tx_dtap_to_i(msc_a, msg);
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}
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int msc_send_ussd_release_complete_cause(struct msc_a *msc_a,
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uint8_t transaction_id,
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uint8_t cause_loc, uint8_t cause_val)
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{
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struct msgb *msg;
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uint8_t *cause_ie;
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msg = gsm0480_create_release_complete(transaction_id);
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if (!msg)
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return -1;
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/* Encode cause IE (see GSM 04.08, section 10.5.4.11)
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* with fixed length (2 bytes of TL, 2 bytes of payload).
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* NOTE: we don't use gsm48_encode_cause() API because
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* it wants gsm_mncc_cause struct from us. */
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cause_ie = msgb_put(msg, 2 + 2);
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cause_ie[0] = GSM48_IE_CAUSE;
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cause_ie[1] = 2;
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/* Coding standard defined for the GSM PLMNs,
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* location and cause: as given by caller,
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* no extension, no diagnostics. */
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cause_ie[2] = (1 << 7) | (0x03 << 5) | (cause_loc & 0x0f);
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cause_ie[3] = (1 << 7) | cause_val;
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return msc_a_tx_dtap_to_i(msc_a, msg);
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}
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