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