| /* 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> |
| |
| 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; |
| } |
| |
| |
| /* Send response to a mobile-originated ProcessUnstructuredSS-Request */ |
| int gsm0480_send_ussd_response(struct gsm_subscriber_connection *conn, |
| const struct msgb *in_msg, const char *response_text, |
| const struct ss_request *req) |
| { |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 USSD RSP"); |
| struct gsm48_hdr *gh; |
| uint8_t *ptr8; |
| int response_len; |
| |
| /* First put the payload text into the message */ |
| ptr8 = msgb_put(msg, 0); |
| gsm_7bit_encode_n_ussd(ptr8, msgb_tailroom(msg), response_text, &response_len); |
| msgb_put(msg, response_len); |
| |
| /* Then wrap it as an Octet String */ |
| msgb_wrap_with_TL(msg, ASN1_OCTET_STRING_TAG); |
| |
| /* Pre-pend the DCS octet string */ |
| msgb_push_TLV1(msg, ASN1_OCTET_STRING_TAG, 0x0F); |
| |
| /* Then wrap these as a Sequence */ |
| msgb_wrap_with_TL(msg, GSM_0480_SEQUENCE_TAG); |
| |
| /* Pre-pend the operation code */ |
| msgb_push_TLV1(msg, GSM0480_OPERATION_CODE, |
| GSM0480_OP_CODE_PROCESS_USS_REQ); |
| |
| /* Wrap the operation code and IA5 string as a sequence */ |
| msgb_wrap_with_TL(msg, GSM_0480_SEQUENCE_TAG); |
| |
| /* Pre-pend the invoke ID */ |
| msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, req->invoke_id); |
| |
| /* Wrap this up as a Return Result component */ |
| msgb_wrap_with_TL(msg, GSM0480_CTYPE_RETURN_RESULT); |
| |
| /* 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 | req->transaction_id |
| | (1<<7); /* TI direction = 1 */ |
| gh->msg_type = GSM0480_MTYPE_RELEASE_COMPLETE; |
| |
| return gsm0808_submit_dtap(conn, msg, 0, 0); |
| } |
| |
| int gsm0480_send_ussd_reject(struct gsm_subscriber_connection *conn, |
| const struct msgb *in_msg, |
| const struct ss_request *req) |
| { |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 USSD REJ"); |
| struct gsm48_hdr *gh; |
| |
| /* 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, req->invoke_id); |
| |
| /* Wrap this up as a Reject component */ |
| msgb_wrap_with_TL(msg, GSM0480_CTYPE_REJECT); |
| |
| /* 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 |= req->transaction_id | (1<<7); /* TI direction = 1 */ |
| gh->msg_type = GSM0480_MTYPE_RELEASE_COMPLETE; |
| |
| return gsm0808_submit_dtap(conn, msg, 0, 0); |
| } |
| |
| 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); |
| } |