120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/* (C) 2009-2010 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2009-2010 by On-Waves
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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 General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <openbsc/osmo_bsc.h>
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#include <openbsc/osmo_msc_data.h>
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#include <openbsc/gsm_04_80.h>
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#include <openbsc/debug.h>
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static void handle_lu_request(struct gsm_subscriber_connection *conn,
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struct msgb *msg)
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{
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struct gsm48_hdr *gh;
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struct gsm48_loc_upd_req *lu;
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struct gsm48_loc_area_id lai;
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struct gsm_network *net;
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if (msgb_l3len(msg) < sizeof(*gh) + sizeof(*lu)) {
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LOGP(DMSC, LOGL_ERROR, "LU too small to look at: %u\n", msgb_l3len(msg));
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return;
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}
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net = conn->bts->network;
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gh = msgb_l3(msg);
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lu = (struct gsm48_loc_upd_req *) gh->data;
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gsm48_generate_lai(&lai, net->country_code, net->network_code,
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conn->bts->location_area_code);
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if (memcmp(&lai, &lu->lai, sizeof(lai)) != 0) {
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LOGP(DMSC, LOGL_DEBUG, "Marking con for welcome USSD.\n");
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conn->sccp_con->new_subscriber = 1;
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}
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}
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/**
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* This is used to scan a message for extra functionality of the BSC. This
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* includes scanning for location updating requests/acceptd and then send
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* a welcome USSD message to the subscriber.
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*/
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int bsc_scan_bts_msg(struct gsm_subscriber_connection *conn, struct msgb *msg)
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{
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struct gsm48_hdr *gh = msgb_l3(msg);
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uint8_t pdisc = gh->proto_discr & 0x0f;
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uint8_t mtype = gh->msg_type & 0xbf;
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if (pdisc == GSM48_PDISC_MM) {
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if (mtype == GSM48_MT_MM_LOC_UPD_REQUEST)
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handle_lu_request(conn, msg);
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}
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return 0;
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}
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static void send_welcome_ussd(struct gsm_subscriber_connection *conn)
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{
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struct gsm_network *net;
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net = conn->bts->network;
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if (!net->msc_data->ussd_welcome_txt)
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return;
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gsm0480_send_ussdNotify(conn, 1, net->msc_data->ussd_welcome_txt);
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gsm0480_send_releaseComplete(conn);
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}
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/**
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* Messages coming back from the MSC.
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*/
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int bsc_scan_msc_msg(struct gsm_subscriber_connection *conn, struct msgb *msg)
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{
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struct gsm_network *net;
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struct gsm48_loc_area_id *lai;
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struct gsm48_hdr *gh;
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uint8_t mtype;
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if (msgb_l3len(msg) < sizeof(*gh)) {
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LOGP(DMSC, LOGL_ERROR, "GSM48 header does not fit.\n");
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return -1;
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}
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gh = (struct gsm48_hdr *) msgb_l3(msg);
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mtype = gh->msg_type & 0xbf;
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net = conn->bts->network;
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if (mtype == GSM48_MT_MM_LOC_UPD_ACCEPT) {
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if (net->msc_data->core_ncc != -1 ||
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net->msc_data->core_mcc != -1) {
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if (msgb_l3len(msg) >= sizeof(*gh) + sizeof(*lai)) {
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lai = (struct gsm48_loc_area_id *) &gh->data[0];
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gsm48_generate_lai(lai, net->country_code,
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net->network_code,
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conn->bts->location_area_code);
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}
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}
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if (conn->sccp_con->new_subscriber)
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send_welcome_ussd(conn);
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}
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return 0;
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}
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