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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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <openbsc/debug.h>
#include <openbsc/gsm_data.h>
#include <openbsc/gsm_04_08.h>
#include <openbsc/gsm_04_80.h>
#include <openbsc/bsc_api.h>
#include <osmocom/gsm/gsm0480.h>
#include <osmocom/gsm/gsm_utils.h>
#include <osmocom/core/msgb.h>
#include <osmocom/gsm/tlv.h>
/* This function can handle ASN1 length up to 255 which is enough for USSD */
static inline unsigned char *msgb_wrap_with_ASN1_TL(struct msgb *msgb, uint8_t tag)
{
uint16_t origlen = msgb->len;
uint8_t *data = msgb_push(msgb, (origlen > 0x7f) ? 3 : 2);
data[0] = tag;
if (origlen > 0x7f) {
data[1] = 0x81;
data[2] = origlen;
} else {
data[1] = origlen;
}
return data;
}
static inline unsigned char *msgb_wrap_with_TL(struct msgb *msgb, uint8_t tag)
{
uint8_t *data = msgb_push(msgb, 2);
data[0] = tag;
data[1] = msgb->len - 2;
return data;
}
static inline unsigned char *msgb_push_TLV1(struct msgb *msgb, uint8_t tag,
uint8_t value)
{
uint8_t *data = msgb_push(msgb, 3);
data[0] = tag;
data[1] = 1;
data[2] = value;
return data;
}
static inline unsigned char *msgb_wrap_with_L(struct msgb *msgb)
{
uint8_t *data = msgb_push(msgb, 1);
data[0] = msgb->len - 1;
return data;
}
/* Compose universial USSD packet invoke/return_result payload */
struct msgb *gsm0480_compose_ussd_component(struct ss_request* req)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 USSD RSP");
uint8_t *ptr8;
/* First put the payload text into the message */
ptr8 = msgb_put(msg, 0);
memcpy(ptr8, req->ussd_text, req->ussd_text_len);
msgb_put(msg, req->ussd_text_len);
/* Then wrap it as an Octet String */
msgb_wrap_with_ASN1_TL(msg, ASN1_OCTET_STRING_TAG);
/* Pre-pend the DCS octet string */
msgb_push_TLV1(msg, ASN1_OCTET_STRING_TAG, req->ussd_text_language);
/* Then wrap these as a Sequence */
msgb_wrap_with_ASN1_TL(msg, GSM_0480_SEQUENCE_TAG);
if (req->component_type == GSM0480_CTYPE_RETURN_RESULT) {
/* Pre-pend the operation code */
msgb_push_TLV1(msg, GSM0480_OPERATION_CODE, req->opcode);
/* Wrap the operation code and IA5 string as a sequence */
msgb_wrap_with_ASN1_TL(msg, GSM_0480_SEQUENCE_TAG);
/* Pre-pend the invoke ID */
msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, req->invoke_id);
} else if (req->component_type == GSM0480_CTYPE_INVOKE) {
/* Pre-pend the operation code */
msgb_push_TLV1(msg, GSM0480_OPERATION_CODE, req->opcode);
/* Pre-pend the invoke ID */
msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, req->invoke_id);
} else {
abort();
}
/* Wrap this up as an Invoke or a Return Result component */
msgb_wrap_with_ASN1_TL(msg, req->component_type);
return msg;
}
#ifndef NO_GSM0480_SEND_FUNC
int gsm0480_send_component(struct gsm_subscriber_connection *conn,
struct msgb *msg,
struct ss_header* reqhdr)
{
#if 0
struct msgb *msg = gsm48_msgb_alloc();
struct gsm48_hdr *gh;
uint8_t *ptr8;
ptr8 = msgb_put(msg, 0);
memcpy(ptr8, component, reqhdr->component_length);
msgb_put(msg, reqhdr->component_length);
#endif
struct gsm48_hdr *gh;
if (reqhdr->message_type == GSM0480_MTYPE_REGISTER ||
reqhdr->message_type == GSM0480_MTYPE_RELEASE_COMPLETE) {
/* Wrap the component in a Facility message, it's not ASN1 */
msgb_wrap_with_TL(msg, GSM0480_IE_FACILITY);
} else if (reqhdr->message_type == GSM0480_MTYPE_FACILITY) {
/* For GSM0480_MTYPE_FACILITY it's LV not TLV */
msgb_wrap_with_L(msg);
} else {
abort();
}
/* And finally pre-pend the L3 header */
gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh));
gh->proto_discr = GSM48_PDISC_NC_SS | reqhdr->transaction_id
| (1<<7); /* TI direction = 1 */
gh->msg_type = reqhdr->message_type;
DEBUGP(DSS, "Sending SS to mobile: %s\n", msgb_hexdump(msg));
return gsm0808_submit_dtap(conn, msg, 0, 0);
}
#if 0
/* Compose universial SS packet except Reject opcodes */
int gsm0480_send_ussd(struct gsm_subscriber_connection *conn,
struct ss_request* req)
{
struct msgb *msg = gsm48_msgb_alloc();
struct gsm48_hdr *gh;
uint8_t *ptr8;
/* First put the payload text into the message */
ptr8 = msgb_put(msg, 0);
memcpy(ptr8, req->ussd_text, req->ussd_text_len);
msgb_put(msg, req->ussd_text_len);
/* Then wrap it as an Octet String */
msgb_wrap_with_ASN1_TL(msg, ASN1_OCTET_STRING_TAG);
/* Pre-pend the DCS octet string */
msgb_push_TLV1(msg, ASN1_OCTET_STRING_TAG, req->ussd_text_language);
/* Then wrap these as a Sequence */
msgb_wrap_with_ASN1_TL(msg, GSM_0480_SEQUENCE_TAG);
if (req->component_type == GSM0480_CTYPE_RETURN_RESULT) {
/* Pre-pend the operation code */
msgb_push_TLV1(msg, GSM0480_OPERATION_CODE, req->opcode);
/* Wrap the operation code and IA5 string as a sequence */
msgb_wrap_with_ASN1_TL(msg, GSM_0480_SEQUENCE_TAG);
/* Pre-pend the invoke ID */
msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, req->invoke_id);
} else if (req->component_type == GSM0480_CTYPE_INVOKE) {
/* Pre-pend the operation code */
msgb_push_TLV1(msg, GSM0480_OPERATION_CODE, req->opcode);
/* Pre-pend the invoke ID */
msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, req->invoke_id);
} else {
abort();
}
/* Wrap this up as an Invoke or a Return Result component */
msgb_wrap_with_ASN1_TL(msg, req->component_type);
if (req->message_type == GSM0480_MTYPE_REGISTER ||
req->message_type == GSM0480_MTYPE_RELEASE_COMPLETE) {
/* Wrap the component in a Facility message, it's not ASN1 */
msgb_wrap_with_TL(msg, GSM0480_IE_FACILITY);
} else if (req->message_type == GSM0480_MTYPE_FACILITY) {
/* For GSM0480_MTYPE_FACILITY it's LV not TLV */
msgb_wrap_with_L(msg);
} else {
abort();
}
/* And finally pre-pend the L3 header */
gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh));
gh->proto_discr = GSM48_PDISC_NC_SS | req->transaction_id
| (1<<7); /* TI direction = 1 */
gh->msg_type = req->message_type;
DEBUGP(DSS, "Sending USSD to mobile: %s\n", msgb_hexdump(msg));
return gsm0808_submit_dtap(conn, msg, 0, 0);
}
#endif
int gsm0480_send_ussd_reject(struct gsm_subscriber_connection *conn,
uint8_t invoke_id,
uint8_t transaction_id)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 USSD REJ");
struct ss_header ssh;
/* First insert the problem code */
msgb_push_TLV1(msg, GSM_0480_PROBLEM_CODE_TAG_GENERAL,
GSM_0480_GEN_PROB_CODE_UNRECOGNISED);
/* Before it insert the invoke ID */
msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, invoke_id);
/* Wrap this up as a Reject component */
msgb_wrap_with_ASN1_TL(msg, GSM0480_CTYPE_REJECT);
/* Prepare data for L3 header */
ssh.transaction_id = transaction_id;
ssh.message_type = GSM0480_MTYPE_RELEASE_COMPLETE;
return gsm0480_send_component(conn, msg, &ssh);
#if 0
/* Wrap the component in a Facility message */
msgb_wrap_with_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 | (1<<7); /* TI direction = 1 */
gh->msg_type = GSM0480_MTYPE_RELEASE_COMPLETE;
return gsm0808_submit_dtap(conn, msg, 0, 0);
#endif
}
int msc_send_ussd_notify(struct gsm_subscriber_connection *conn, int level, const char *text)
{
struct msgb *msg = gsm0480_create_ussd_notify(level, text);
if (!msg)
return -1;
return gsm0808_submit_dtap(conn, msg, 0, 0);
}
int msc_send_ussd_release_complete(struct gsm_subscriber_connection *conn)
{
struct msgb *msg = gsm0480_create_ussd_release_complete();
if (!msg)
return -1;
return gsm0808_submit_dtap(conn, msg, 0, 0);
}
#endif
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