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/* (C) 2009-2011 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2009-2011 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 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 <osmocom/gsm/gsm48.h>
#include <osmocom/bsc/osmo_bsc.h>
#include <osmocom/bsc/bsc_msc_data.h>
#include <osmocom/bsc/gsm_04_80.h>
#include <osmocom/bsc/gsm_04_08_rr.h>
#include <osmocom/bsc/bsc_subscriber.h>
#include <osmocom/bsc/debug.h>
#include <osmocom/bsc/paging.h>
#include <osmocom/bsc/gsm_04_08_rr.h>
#include <stdlib.h>
static int send_welcome_ussd(struct gsm_subscriber_connection *conn)
{
if (!conn->sccp.msc->ussd_welcome_txt) {
LOGP(DMSC, LOGL_DEBUG, "No USSD Welcome text defined.\n");
return 0;
}
return BSS_SEND_USSD;
}
static int bsc_patch_mm_info(struct gsm_subscriber_connection *conn,
uint8_t *data, unsigned int length)
{
struct tlv_parsed tp;
int parse_res;
struct gsm_bts *bts = conn_get_bts(conn);
int tzunits;
uint8_t tzbsd = 0;
uint8_t dst = 0;
parse_res = tlv_parse(&tp, &gsm48_mm_att_tlvdef, data, length, 0, 0);
if (parse_res <= 0 && parse_res != -3)
/* FIXME: -3 means unknown IE error, so this accepts messages
* with unknown IEs. But parsing has aborted with the unknown
* IE and the message is broken or parsed incompletely. */
return 0;
/* Is TZ patching enabled? */
struct gsm_tz *tz = &bts->network->tz;
if (!tz->override)
return 0;
/* Convert tz.hr and tz.mn to units */
if (tz->hr < 0) {
tzunits = -tz->hr*4;
tzbsd |= 0x08;
} else
tzunits = tz->hr*4;
tzunits = tzunits + (tz->mn/15);
tzbsd |= (tzunits % 10)*0x10 + (tzunits / 10);
/* Convert DST value */
if (tz->dst >= 0 && tz->dst <= 2)
dst = tz->dst;
if (TLVP_PRESENT(&tp, GSM48_IE_UTC)) {
LOGP(DMSC, LOGL_DEBUG,
"Changing 'Local time zone' from 0x%02x to 0x%02x.\n",
TLVP_VAL(&tp, GSM48_IE_UTC)[6], tzbsd);
((uint8_t *)(TLVP_VAL(&tp, GSM48_IE_UTC)))[0] = tzbsd;
}
if (TLVP_PRESENT(&tp, GSM48_IE_NET_TIME_TZ)) {
LOGP(DMSC, LOGL_DEBUG,
"Changing 'Universal time and local time zone' TZ from "
"0x%02x to 0x%02x.\n",
TLVP_VAL(&tp, GSM48_IE_NET_TIME_TZ)[6], tzbsd);
((uint8_t *)(TLVP_VAL(&tp, GSM48_IE_NET_TIME_TZ)))[6] = tzbsd;
}
#ifdef GSM48_IE_NET_DST
if (TLVP_PRESENT(&tp, GSM48_IE_NET_DST)) {
LOGP(DMSC, LOGL_DEBUG,
"Changing 'Network daylight saving time' from "
"0x%02x to 0x%02x.\n",
TLVP_VAL(&tp, GSM48_IE_NET_DST)[0], dst);
((uint8_t *)(TLVP_VAL(&tp, GSM48_IE_NET_DST)))[0] = dst;
}
#endif
return 0;
}
static int has_core_identity(struct bsc_msc_data *msc)
{
if (msc->core_plmn.mnc != GSM_MCC_MNC_INVALID)
return 1;
if (msc->core_plmn.mcc != GSM_MCC_MNC_INVALID)
return 1;
if (msc->core_lac != -1)
return 1;
if (msc->core_ci != -1)
return 1;
return 0;
}
/**
* Messages coming back from the MSC.
*/
int bsc_scan_msc_msg(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct bsc_msc_data *msc;
struct gsm48_loc_area_id *lai;
struct gsm48_hdr *gh;
uint8_t pdisc;
uint8_t mtype;
int length = msgb_l3len(msg);
if (length < sizeof(*gh)) {
LOGP(DMSC, LOGL_ERROR, "GSM48 header does not fit.\n");
return -1;
}
gh = (struct gsm48_hdr *) msgb_l3(msg);
length -= (const char *)&gh->data[0] - (const char *)gh;
pdisc = gsm48_hdr_pdisc(gh);
if (pdisc != GSM48_PDISC_MM)
return 0;
mtype = gsm48_hdr_msg_type(gh);
msc = conn->sccp.msc;
if (mtype == GSM48_MT_MM_LOC_UPD_ACCEPT) {
if (has_core_identity(msc)) {
if (msgb_l3len(msg) >= sizeof(*gh) + sizeof(*lai)) {
/* overwrite LAI in the message */
lai = (struct gsm48_loc_area_id *) &gh->data[0];
gsm48_generate_lai2(lai, bts_lai(conn_get_bts(conn)));
}
}
if (conn->new_subscriber)
return send_welcome_ussd(conn);
return 0;
} else if (mtype == GSM48_MT_MM_INFO) {
bsc_patch_mm_info(conn, &gh->data[0], length);
}
return 0;
}
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