890 lines
22 KiB
C
890 lines
22 KiB
C
/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface
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* 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */
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/* (C) 2008 by Harald Welte <laforge@gnumonks.org>
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* (C) 2008 by Holger Hans Peter Freyther <zecke@selfish.org>
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*
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <time.h>
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#include <netinet/in.h>
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#include <openbsc/db.h>
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#include <openbsc/msgb.h>
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#include <openbsc/debug.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/gsm_subscriber.h>
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#include <openbsc/gsm_04_11.h>
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#include <openbsc/gsm_04_08.h>
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#include <openbsc/abis_rsl.h>
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#include <openbsc/chan_alloc.h>
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#define GSM48_ALLOC_SIZE 1024
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#define GSM48_ALLOC_HEADROOM 128
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static int gsm48_tx_simple(struct gsm_lchan *lchan,
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u_int8_t pdisc, u_int8_t msg_type);
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static void schedule_reject(struct gsm_lchan *lchan);
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struct gsm_lai {
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u_int16_t mcc;
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u_int16_t mnc;
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u_int16_t lac;
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};
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static int authorize_everonye = 0;
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void gsm0408_allow_everyone(int everyone)
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{
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printf("Allowing everyone?\n");
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authorize_everonye = everyone;
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}
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static int reject_cause = 0;
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void gsm0408_set_reject_cause(int cause)
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{
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reject_cause = cause;
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}
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static int authorize_subscriber(struct gsm_loc_updating_operation *loc,
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struct gsm_subscriber *subscriber)
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{
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if (!subscriber)
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return 0;
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/*
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* Do not send accept yet as more information should arrive. Some
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* phones will not send us the information and we will have to check
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* what we want to do with that.
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*/
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if (loc && (loc->waiting_for_imsi || loc->waiting_for_imei))
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return 0;
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if (authorize_everonye)
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return 1;
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return subscriber->authorized;
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}
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static void release_loc_updating_req(struct gsm_lchan *lchan)
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{
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if (!lchan->loc_operation)
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return;
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del_timer(&lchan->loc_operation->updating_timer);
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free(lchan->loc_operation);
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lchan->loc_operation = 0;
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put_lchan(lchan);
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}
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static void allocate_loc_updating_req(struct gsm_lchan *lchan)
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{
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use_lchan(lchan);
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release_loc_updating_req(lchan);
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lchan->loc_operation = (struct gsm_loc_updating_operation *)
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malloc(sizeof(*lchan->loc_operation));
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memset(lchan->loc_operation, 0, sizeof(*lchan->loc_operation));
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}
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static void to_bcd(u_int8_t *bcd, u_int16_t val)
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{
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bcd[2] = val % 10;
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val = val / 10;
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bcd[1] = val % 10;
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val = val / 10;
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bcd[0] = val % 10;
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val = val / 10;
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}
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void gsm0408_generate_lai(struct gsm48_loc_area_id *lai48, u_int16_t mcc,
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u_int16_t mnc, u_int16_t lac)
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{
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u_int8_t bcd[3];
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to_bcd(bcd, mcc);
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lai48->digits[0] = bcd[0] | (bcd[1] << 4);
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lai48->digits[1] = bcd[2];
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to_bcd(bcd, mnc);
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/* FIXME: do we need three-digit MNC? See Table 10.5.3 */
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#if 0
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lai48->digits[1] |= bcd[2] << 4;
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lai48->digits[2] = bcd[0] | (bcd[1] << 4);
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#else
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lai48->digits[1] |= 0xf << 4;
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lai48->digits[2] = bcd[1] | (bcd[2] << 4);
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#endif
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lai48->lac = htons(lac);
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}
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#define TMSI_LEN 5
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#define MID_TMSI_LEN (TMSI_LEN + 2)
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int generate_mid_from_tmsi(u_int8_t *buf, u_int32_t tmsi)
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{
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u_int32_t *tptr = (u_int32_t *) &buf[3];
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buf[0] = GSM48_IE_MOBILE_ID;
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buf[1] = TMSI_LEN;
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buf[2] = 0xf0 | GSM_MI_TYPE_TMSI;
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*tptr = htonl(tmsi);
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return 7;
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}
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struct msgb *gsm48_msgb_alloc(void)
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{
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return msgb_alloc_headroom(GSM48_ALLOC_SIZE, GSM48_ALLOC_HEADROOM);
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}
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int gsm48_sendmsg(struct msgb *msg)
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{
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struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->data;
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if (msg->lchan) {
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msg->trx = msg->lchan->ts->trx;
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if ((gh->proto_discr & GSM48_PDISC_MASK) == GSM48_PDISC_CC) {
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/* Send a 04.08 call control message, add transaction
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* ID and TI flag */
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gh->proto_discr |= msg->lchan->call.transaction_id;
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/* GSM 04.07 Section 11.2.3.1.3 */
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switch (msg->lchan->call.type) {
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case GSM_CT_MO:
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gh->proto_discr |= 0x80;
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break;
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case GSM_CT_MT:
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break;
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case GSM_CT_NONE:
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break;
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}
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}
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}
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msg->l3h = msg->data;
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return rsl_data_request(msg, 0);
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}
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/* Chapter 9.2.14 : Send LOCATION UPDATING REJECT */
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int gsm0408_loc_upd_rej(struct gsm_lchan *lchan, u_int8_t cause)
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{
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struct msgb *msg = gsm48_msgb_alloc();
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struct gsm48_hdr *gh;
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msg->lchan = lchan;
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
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gh->proto_discr = GSM48_PDISC_MM;
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gh->msg_type = GSM48_MT_MM_LOC_UPD_REJECT;
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gh->data[0] = cause;
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DEBUGP(DMM, "-> LOCATION UPDATING REJECT on channel: %d\n", lchan->nr);
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//gsm0411_send_sms(lchan, NULL);
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return gsm48_sendmsg(msg);
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}
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/* Chapter 9.2.13 : Send LOCATION UPDATE ACCEPT */
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int gsm0408_loc_upd_acc(struct gsm_lchan *lchan, u_int32_t tmsi)
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{
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struct gsm_bts *bts = lchan->ts->trx->bts;
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struct msgb *msg = gsm48_msgb_alloc();
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struct gsm48_hdr *gh;
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struct gsm48_loc_area_id *lai;
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u_int8_t *mid;
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int ret;
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msg->lchan = lchan;
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
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gh->proto_discr = GSM48_PDISC_MM;
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gh->msg_type = GSM48_MT_MM_LOC_UPD_ACCEPT;
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lai = (struct gsm48_loc_area_id *) msgb_put(msg, sizeof(*lai));
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gsm0408_generate_lai(lai, bts->network->country_code,
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bts->network->network_code, bts->location_area_code);
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mid = msgb_put(msg, MID_TMSI_LEN);
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generate_mid_from_tmsi(mid, tmsi);
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DEBUGP(DMM, "-> LOCATION UPDATE ACCEPT\n");
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ret = gsm48_sendmsg(msg);
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/* return gsm48_cc_tx_setup(lchan); */
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ret = gsm48_tx_mm_info(lchan);
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ret = gsm0411_send_sms(lchan, NULL);
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return ret;
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}
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static char bcd2char(u_int8_t bcd)
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{
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if (bcd < 0xa)
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return '0' + bcd;
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else
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return 'A' + (bcd - 0xa);
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}
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/* 10.5.1.4 */
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static int mi_to_string(char *string, int str_len, u_int8_t *mi, int mi_len)
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{
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int i;
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u_int8_t mi_type;
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char *str_cur = string;
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mi_type = mi[0] & GSM_MI_TYPE_MASK;
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switch (mi_type) {
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case GSM_MI_TYPE_NONE:
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break;
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case GSM_MI_TYPE_TMSI:
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/* skip padding nibble at the beginning, start at offset 1... */
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for (i = 1; i < mi_len; i++) {
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if (str_cur + 2 >= string + str_len)
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return str_cur - string;
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*str_cur++ = bcd2char(mi[i] >> 4);
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*str_cur++ = bcd2char(mi[i] & 0xf);
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}
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break;
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case GSM_MI_TYPE_IMSI:
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case GSM_MI_TYPE_IMEI:
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case GSM_MI_TYPE_IMEISV:
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*str_cur++ = bcd2char(mi[0] >> 4);
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for (i = 1; i < mi_len; i++) {
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if (str_cur + 2 >= string + str_len)
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return str_cur - string;
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*str_cur++ = bcd2char(mi[i] & 0xf);
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/* skip last nibble in last input byte when GSM_EVEN */
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if( (i != mi_len-1) || (mi[0] & GSM_MI_ODD))
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*str_cur++ = bcd2char(mi[i] >> 4);
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}
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break;
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default:
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break;
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}
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*str_cur++ = '\0';
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return str_cur - string;
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}
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/* Chapter 9.2.10 */
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static int mm_tx_identity_req(struct gsm_lchan *lchan, u_int8_t id_type)
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{
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struct msgb *msg = gsm48_msgb_alloc();
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struct gsm48_hdr *gh;
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msg->lchan = lchan;
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
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gh->proto_discr = GSM48_PDISC_MM;
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gh->msg_type = GSM48_MT_MM_ID_REQ;
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gh->data[0] = id_type;
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return gsm48_sendmsg(msg);
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}
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#define MI_SIZE 32
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/* Chapter 9.2.11 */
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static int mm_rx_id_resp(struct msgb *msg)
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{
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struct gsm48_hdr *gh = msgb_l3(msg);
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struct gsm_lchan *lchan = msg->lchan;
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u_int8_t mi_type = gh->data[1] & GSM_MI_TYPE_MASK;
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char mi_string[MI_SIZE];
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u_int32_t tmsi;
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mi_to_string(mi_string, sizeof(mi_string), &gh->data[1], gh->data[0]);
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DEBUGP(DMM, "IDENTITY RESPONSE: mi_type=0x%02x MI(%s)\n",
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mi_type, mi_string);
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/*
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* Rogue messages could trick us but so is life
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*/
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put_lchan(lchan);
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switch (mi_type) {
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case GSM_MI_TYPE_IMSI:
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if (!lchan->subscr)
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lchan->subscr = db_create_subscriber(mi_string);
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if (lchan->loc_operation)
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lchan->loc_operation->waiting_for_imsi = 0;
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break;
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case GSM_MI_TYPE_IMEI:
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case GSM_MI_TYPE_IMEISV:
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/* update subscribe <-> IMEI mapping */
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if (lchan->subscr)
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db_subscriber_assoc_imei(lchan->subscr, mi_string);
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if (lchan->loc_operation)
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lchan->loc_operation->waiting_for_imei = 0;
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break;
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}
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/* Check if we can let the mobile station enter */
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if (authorize_subscriber(lchan->loc_operation, lchan->subscr)) {
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db_subscriber_alloc_tmsi(lchan->subscr);
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tmsi = strtoul(lchan->subscr->tmsi, NULL, 10);
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release_loc_updating_req(lchan);
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return gsm0408_loc_upd_acc(msg->lchan, tmsi);
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}
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return 0;
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}
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static void loc_upd_rej_cb(void *data)
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{
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struct gsm_lchan *lchan = data;
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release_loc_updating_req(lchan);
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gsm0408_loc_upd_rej(lchan, reject_cause);
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lchan_auto_release(lchan);
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}
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static void schedule_reject(struct gsm_lchan *lchan)
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{
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lchan->loc_operation->updating_timer.cb = loc_upd_rej_cb;
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lchan->loc_operation->updating_timer.data = lchan;
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schedule_timer(&lchan->loc_operation->updating_timer, 5, 0);
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}
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#define MI_SIZE 32
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/* Chapter 9.2.15 */
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static int mm_rx_loc_upd_req(struct msgb *msg)
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{
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struct gsm48_hdr *gh = msgb_l3(msg);
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struct gsm_bts *bts = msg->trx->bts;
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struct gsm48_loc_upd_req *lu;
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struct gsm_subscriber *subscr;
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struct gsm_lchan *lchan = msg->lchan;
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u_int8_t mi_type;
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u_int32_t tmsi;
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char mi_string[MI_SIZE];
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int rc;
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lu = (struct gsm48_loc_upd_req *) gh->data;
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mi_type = lu->mi[0] & GSM_MI_TYPE_MASK;
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mi_to_string(mi_string, sizeof(mi_string), lu->mi, lu->mi_len);
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DEBUGP(DMM, "LUPDREQ: mi_type=0x%02x MI(%s)\n", mi_type, mi_string);
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allocate_loc_updating_req(lchan);
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switch (mi_type) {
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case GSM_MI_TYPE_IMSI:
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/* we always want the IMEI, too */
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use_lchan(lchan);
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rc = mm_tx_identity_req(lchan, GSM_MI_TYPE_IMEISV);
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lchan->loc_operation->waiting_for_imei = 1;
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/* look up subscriber based on IMSI */
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subscr = db_create_subscriber(mi_string);
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break;
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case GSM_MI_TYPE_TMSI:
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/* we always want the IMEI, too */
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use_lchan(lchan);
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rc = mm_tx_identity_req(lchan, GSM_MI_TYPE_IMEISV);
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lchan->loc_operation->waiting_for_imei = 1;
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/* look up the subscriber based on TMSI, request IMSI if it fails */
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subscr = subscr_get_by_tmsi((char *)lu->mi);
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if (!subscr) {
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/* send IDENTITY REQUEST message to get IMSI */
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use_lchan(lchan);
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rc = mm_tx_identity_req(lchan, GSM_MI_TYPE_IMSI);
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lchan->loc_operation->waiting_for_imsi = 1;
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}
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break;
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case GSM_MI_TYPE_IMEI:
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case GSM_MI_TYPE_IMEISV:
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/* no sim card... FIXME: what to do ? */
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fprintf(stderr, "Unimplemented mobile identity type\n");
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break;
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default:
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fprintf(stderr, "Unknown mobile identity type\n");
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break;
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}
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lchan->subscr = subscr;
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/*
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* Schedule the reject timer and check if we can let the
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* subscriber into our network immediately or if we need to wait
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* for identity responses.
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*/
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schedule_reject(lchan);
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if (!authorize_subscriber(lchan->loc_operation, subscr))
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return 0;
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db_subscriber_alloc_tmsi(subscr);
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subscr_update(subscr, bts);
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tmsi = strtoul(subscr->tmsi, NULL, 10);
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release_loc_updating_req(lchan);
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return gsm0408_loc_upd_acc(lchan, tmsi);
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}
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/* Section 9.2.15a */
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int gsm48_tx_mm_info(struct gsm_lchan *lchan)
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{
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struct msgb *msg = gsm48_msgb_alloc();
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struct gsm48_hdr *gh;
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struct gsm_network *net = lchan->ts->trx->bts->network;
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u_int8_t *ptr8;
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u_int16_t *ptr16;
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int name_len;
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int i;
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msg->lchan = lchan;
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
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gh->proto_discr = GSM48_PDISC_MM;
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gh->msg_type = GSM48_MT_MM_INFO;
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if (net->name_long) {
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name_len = strlen(net->name_long);
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/* 10.5.3.5a */
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ptr8 = msgb_put(msg, 3);
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ptr8[0] = GSM48_IE_NAME_LONG;
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ptr8[1] = name_len*2 +1;
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ptr8[2] = 0x90; /* UCS2, no spare bits, no CI */
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ptr16 = (u_int16_t *) msgb_put(msg, name_len*2);
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for (i = 0; i < name_len; i++)
|
|
ptr16[i] = htons(net->name_long[i]);
|
|
|
|
/* FIXME: Use Cell Broadcast, not UCS-2, since
|
|
* UCS-2 is only supported by later revisions of the spec */
|
|
}
|
|
|
|
if (net->name_short) {
|
|
name_len = strlen(net->name_short);
|
|
/* 10.5.3.5a */
|
|
ptr8 = (u_int8_t *) msgb_put(msg, 3);
|
|
ptr8[0] = GSM48_IE_NAME_LONG;
|
|
ptr8[1] = name_len*2 + 1;
|
|
ptr8[2] = 0x90; /* UCS2, no spare bits, no CI */
|
|
|
|
ptr16 = (u_int16_t *) msgb_put(msg, name_len*2);
|
|
for (i = 0; i < name_len; i++)
|
|
ptr16[i] = htons(net->name_short[i]);
|
|
}
|
|
|
|
#if 0
|
|
/* move back to the top */
|
|
time_t cur_t;
|
|
struct tm* cur_time;
|
|
int tz15min;
|
|
/* Section 10.5.3.9 */
|
|
cur_t = time(NULL);
|
|
cur_time = gmtime(cur_t);
|
|
ptr8 = msgb_put(msg, 8);
|
|
ptr8[0] = GSM48_IE_NET_TIME_TZ;
|
|
ptr8[1] = to_bcd8(cur_time->tm_year % 100);
|
|
ptr8[2] = to_bcd8(cur_time->tm_mon);
|
|
ptr8[3] = to_bcd8(cur_time->tm_mday);
|
|
ptr8[4] = to_bcd8(cur_time->tm_hour);
|
|
ptr8[5] = to_bcd8(cur_time->tm_min);
|
|
ptr8[6] = to_bcd8(cur_time->tm_sec);
|
|
/* 02.42: coded as BCD encoded signed value in units of 15 minutes */
|
|
tz15min = (cur_time->tm_gmtoff)/(60*15);
|
|
ptr8[6] = to_bcd8(tz15min);
|
|
if (tz15min < 0)
|
|
ptr8[6] |= 0x80;
|
|
#endif
|
|
|
|
return gsm48_sendmsg(msg);
|
|
}
|
|
|
|
static int gsm48_tx_mm_serv_ack(struct gsm_lchan *lchan)
|
|
{
|
|
DEBUGP(DMM, "-> CM SERVICE ACK\n");
|
|
return gsm48_tx_simple(lchan, GSM48_PDISC_MM, GSM48_MT_MM_CM_SERV_ACC);
|
|
}
|
|
|
|
static int gsm48_rx_mm_serv_req(struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
u_int8_t serv_type = gh->data[0] & 0x0f;
|
|
|
|
DEBUGP(DMM, "<- CM SERVICE REQUEST serv_type=0x%02x\n", serv_type);
|
|
|
|
return gsm48_tx_mm_serv_ack(msg->lchan);
|
|
}
|
|
|
|
static int gsm0408_rcv_mm(struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
int rc;
|
|
|
|
switch (gh->msg_type & 0xbf) {
|
|
case GSM48_MT_MM_LOC_UPD_REQUEST:
|
|
DEBUGP(DMM, "LOCATION UPDATING REQUEST\n");
|
|
rc = mm_rx_loc_upd_req(msg);
|
|
break;
|
|
case GSM48_MT_MM_ID_RESP:
|
|
rc = mm_rx_id_resp(msg);
|
|
break;
|
|
case GSM48_MT_MM_CM_SERV_REQ:
|
|
rc = gsm48_rx_mm_serv_req(msg);
|
|
break;
|
|
case GSM48_MT_MM_STATUS:
|
|
DEBUGP(DMM, "MM STATUS: FIXME parse error cond.\n");
|
|
break;
|
|
case GSM48_MT_MM_CM_REEST_REQ:
|
|
case GSM48_MT_MM_TMSI_REALL_COMPL:
|
|
case GSM48_MT_MM_AUTH_RESP:
|
|
case GSM48_MT_MM_IMSI_DETACH_IND:
|
|
fprintf(stderr, "Unimplemented GSM 04.08 MM msg type 0x%02x\n",
|
|
gh->msg_type);
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Unknown GSM 04.08 MM msg type 0x%02x\n",
|
|
gh->msg_type);
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
static int gsm0408_rcv_rr(struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
|
|
switch (gh->msg_type) {
|
|
case GSM48_MT_RR_CLSM_CHG:
|
|
DEBUGP(DRR, "CLASSMARK CHANGE\n");
|
|
/* FIXME: what to do ?!? */
|
|
break;
|
|
case GSM48_MT_RR_GPRS_SUSP_REQ:
|
|
DEBUGP(DRR, "GRPS SUSPEND REQUEST\n");
|
|
break;
|
|
case GSM48_MT_RR_PAG_RESP:
|
|
default:
|
|
fprintf(stderr, "Unimplemented GSM 04.08 msg type 0x%02x\n",
|
|
gh->msg_type);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Call Control */
|
|
|
|
static int gsm48_cc_tx_status(struct gsm_lchan *lchan)
|
|
{
|
|
struct msgb *msg = gsm48_msgb_alloc();
|
|
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
|
|
u_int8_t *cause, *call_state;
|
|
|
|
gh->proto_discr = GSM48_PDISC_CC;
|
|
|
|
msg->lchan = lchan;
|
|
|
|
gh->msg_type = GSM48_MT_CC_STATUS;
|
|
|
|
cause = msgb_put(msg, 3);
|
|
cause[0] = 2;
|
|
cause[1] = GSM48_CAUSE_CS_GSM | GSM48_CAUSE_LOC_USER;
|
|
cause[2] = 0x80 | 30; /* response to status inquiry */
|
|
|
|
call_state = msgb_put(msg, 1);
|
|
call_state[0] = 0xc0 | 0x00;
|
|
|
|
return gsm48_sendmsg(msg);
|
|
}
|
|
|
|
static int gsm48_tx_simple(struct gsm_lchan *lchan,
|
|
u_int8_t pdisc, u_int8_t msg_type)
|
|
{
|
|
struct msgb *msg = gsm48_msgb_alloc();
|
|
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
|
|
|
|
msg->lchan = lchan;
|
|
|
|
gh->proto_discr = pdisc;
|
|
gh->msg_type = msg_type;
|
|
|
|
return gsm48_sendmsg(msg);
|
|
}
|
|
|
|
static int gsm48_cc_rx_status_enq(struct msgb *msg)
|
|
{
|
|
return gsm48_cc_tx_status(msg->lchan);
|
|
}
|
|
|
|
#if 0
|
|
static int gsm48_cc_rx_setup(struct msgb *msg)
|
|
{
|
|
return gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
|
|
GSM48_MT_CC_CALL_CONF);
|
|
}
|
|
#endif
|
|
|
|
int gsm48_cc_tx_setup(struct gsm_lchan *lchan)
|
|
{
|
|
struct msgb *msg = gsm48_msgb_alloc();
|
|
struct gsm48_hdr *gh;
|
|
struct gsm_call *call = &lchan->call;
|
|
|
|
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 8);
|
|
|
|
call->type = GSM_CT_MT;
|
|
msg->lchan = lchan;
|
|
|
|
gh->proto_discr = GSM48_PDISC_CC;
|
|
gh->msg_type = GSM48_MT_CC_SETUP;
|
|
gh->data[0] = 0x34;
|
|
gh->data[1] = 0x00;
|
|
gh->data[2] = 0x5c;
|
|
gh->data[3] = 0x04;
|
|
gh->data[4] = 0xb9;
|
|
gh->data[5] = 0x83;
|
|
gh->data[6] = 0x32;
|
|
gh->data[7] = 0x24;
|
|
|
|
DEBUGP(DCC, "Sending SETUP\n");
|
|
|
|
return gsm48_sendmsg(msg);
|
|
}
|
|
|
|
static int gsm0408_rcv_cc(struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
u_int8_t msg_type = gh->msg_type & 0xbf;
|
|
struct gsm_call *call = &msg->lchan->call;
|
|
int rc = 0;
|
|
|
|
switch (msg_type) {
|
|
case GSM48_MT_CC_CALL_CONF:
|
|
/* Response to SETUP */
|
|
DEBUGP(DCC, "CALL CONFIRM\n");
|
|
break;
|
|
case GSM48_MT_CC_RELEASE_COMPL:
|
|
/* Answer from MS to RELEASE */
|
|
DEBUGP(DCC, "RELEASE COMPLETE (state->NULL)\n");
|
|
call->state = GSM_CSTATE_NULL;
|
|
break;
|
|
case GSM48_MT_CC_ALERTING:
|
|
DEBUGP(DCC, "ALERTING\n");
|
|
break;
|
|
case GSM48_MT_CC_CONNECT:
|
|
DEBUGP(DCC, "CONNECT\n");
|
|
/* MT: need to respond with CONNECT_ACK */
|
|
rc = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
|
|
GSM48_MT_CC_CONNECT_ACK);
|
|
break;
|
|
case GSM48_MT_CC_CONNECT_ACK:
|
|
/* MO: Answer to CONNECT */
|
|
call->state = GSM_CSTATE_ACTIVE;
|
|
DEBUGP(DCC, "CONNECT_ACK (state->ACTIVE)\n");
|
|
break;
|
|
case GSM48_MT_CC_RELEASE:
|
|
DEBUGP(DCC, "RELEASE\n");
|
|
/* need to respond with RELEASE_COMPLETE */
|
|
break;
|
|
case GSM48_MT_CC_STATUS_ENQ:
|
|
rc = gsm48_cc_rx_status_enq(msg);
|
|
break;
|
|
case GSM48_MT_CC_DISCONNECT:
|
|
/* Section 5.4.3.2 */
|
|
DEBUGP(DCC, "DISCONNECT (state->RELEASE_REQ)\n");
|
|
call->state = GSM_CSTATE_RELEASE_REQ;
|
|
/* FIXME: clear the network connection */
|
|
rc = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
|
|
GSM48_MT_CC_RELEASE);
|
|
break;
|
|
case GSM48_MT_CC_SETUP:
|
|
call->type = GSM_CT_MO;
|
|
call->state = GSM_CSTATE_INITIATED;
|
|
call->transaction_id = gh->proto_discr & 0xf0;
|
|
DEBUGP(DCC, "SETUP(tid=0x%02x)\n", call->transaction_id);
|
|
rc = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
|
|
GSM48_MT_CC_CONNECT);
|
|
/* FIXME: continue with CALL_PROCEEDING, ALERTING, CONNECT, RELEASE_COMPLETE */
|
|
break;
|
|
case GSM48_MT_CC_EMERG_SETUP:
|
|
DEBUGP(DCC, "EMERGENCY SETUP\n");
|
|
/* FIXME: continue with CALL_PROCEEDING, ALERTING, CONNECT, RELEASE_COMPLETE */
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Unimplemented GSM 04.08 msg type 0x%02x\n",
|
|
msg_type);
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* here we pass in a msgb from the RSL->RLL. We expect the l3 pointer to be set */
|
|
int gsm0408_rcvmsg(struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
u_int8_t pdisc = gh->proto_discr & 0x0f;
|
|
int rc = 0;
|
|
|
|
switch (pdisc) {
|
|
case GSM48_PDISC_CC:
|
|
rc = gsm0408_rcv_cc(msg);
|
|
break;
|
|
case GSM48_PDISC_MM:
|
|
rc = gsm0408_rcv_mm(msg);
|
|
break;
|
|
case GSM48_PDISC_RR:
|
|
rc = gsm0408_rcv_rr(msg);
|
|
break;
|
|
case GSM48_PDISC_SMS:
|
|
rc = gsm0411_rcv_sms(msg);
|
|
break;
|
|
case GSM48_PDISC_MM_GPRS:
|
|
case GSM48_PDISC_SM_GPRS:
|
|
fprintf(stderr, "Unimplemented GSM 04.08 discriminator 0x%02d\n",
|
|
pdisc);
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Unknown GSM 04.08 discriminator 0x%02d\n",
|
|
pdisc);
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
enum chreq_type {
|
|
CHREQ_T_EMERG_CALL,
|
|
CHREQ_T_CALL_REEST_TCH_F,
|
|
CHREQ_T_CALL_REEST_TCH_H,
|
|
CHREQ_T_CALL_REEST_TCH_H_DBL,
|
|
CHREQ_T_SDCCH,
|
|
CHREQ_T_TCH_F,
|
|
CHREQ_T_VOICE_CALL_TCH_H,
|
|
CHREQ_T_DATA_CALL_TCH_H,
|
|
CHREQ_T_LOCATION_UPD,
|
|
CHREQ_T_PAG_R_ANY,
|
|
CHREQ_T_PAG_R_TCH_F,
|
|
CHREQ_T_PAG_R_TCH_FH,
|
|
};
|
|
|
|
/* Section 9.1.8 / Table 9.9 */
|
|
struct chreq {
|
|
u_int8_t val;
|
|
u_int8_t mask;
|
|
enum chreq_type type;
|
|
};
|
|
|
|
/* If SYSTEM INFORMATION TYPE 4 NECI bit == 1 */
|
|
static const struct chreq chreq_type_neci1[] = {
|
|
{ 0xa0, 0xe0, CHREQ_T_EMERG_CALL },
|
|
{ 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_F },
|
|
{ 0x68, 0xfc, CHREQ_T_CALL_REEST_TCH_H },
|
|
{ 0x6c, 0xfc, CHREQ_T_CALL_REEST_TCH_H_DBL },
|
|
{ 0xe0, 0xe0, CHREQ_T_SDCCH },
|
|
{ 0x40, 0xf0, CHREQ_T_VOICE_CALL_TCH_H },
|
|
{ 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H },
|
|
{ 0x00, 0xf0, CHREQ_T_LOCATION_UPD },
|
|
{ 0x10, 0xf0, CHREQ_T_SDCCH },
|
|
{ 0x80, 0xe0, CHREQ_T_PAG_R_ANY },
|
|
{ 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F },
|
|
{ 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH },
|
|
};
|
|
|
|
/* If SYSTEM INFORMATION TYPE 4 NECI bit == 0 */
|
|
static const struct chreq chreq_type_neci0[] = {
|
|
{ 0xa0, 0xe0, CHREQ_T_EMERG_CALL },
|
|
{ 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_H },
|
|
{ 0xe0, 0xe0, CHREQ_T_TCH_F },
|
|
{ 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H },
|
|
{ 0x00, 0xe0, CHREQ_T_LOCATION_UPD },
|
|
{ 0x80, 0xe0, CHREQ_T_PAG_R_ANY },
|
|
{ 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F },
|
|
{ 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH },
|
|
};
|
|
|
|
static const enum gsm_chan_t ctype_by_chreq[] = {
|
|
[CHREQ_T_EMERG_CALL] = GSM_LCHAN_TCH_F,
|
|
[CHREQ_T_CALL_REEST_TCH_F] = GSM_LCHAN_TCH_F,
|
|
[CHREQ_T_CALL_REEST_TCH_H] = GSM_LCHAN_TCH_H,
|
|
[CHREQ_T_CALL_REEST_TCH_H_DBL] = GSM_LCHAN_TCH_H,
|
|
[CHREQ_T_SDCCH] = GSM_LCHAN_SDCCH,
|
|
[CHREQ_T_TCH_F] = GSM_LCHAN_TCH_F,
|
|
[CHREQ_T_VOICE_CALL_TCH_H] = GSM_LCHAN_TCH_H,
|
|
[CHREQ_T_DATA_CALL_TCH_H] = GSM_LCHAN_TCH_H,
|
|
[CHREQ_T_LOCATION_UPD] = GSM_LCHAN_SDCCH,
|
|
[CHREQ_T_PAG_R_ANY] = GSM_LCHAN_SDCCH,
|
|
[CHREQ_T_PAG_R_TCH_F] = GSM_LCHAN_TCH_F,
|
|
[CHREQ_T_PAG_R_TCH_FH] = GSM_LCHAN_TCH_F,
|
|
};
|
|
|
|
static const enum gsm_chreq_reason_t reason_by_chreq[] = {
|
|
[CHREQ_T_EMERG_CALL] = GSM_CHREQ_REASON_EMERG,
|
|
[CHREQ_T_CALL_REEST_TCH_F] = GSM_CHREQ_REASON_CALL,
|
|
[CHREQ_T_CALL_REEST_TCH_H] = GSM_CHREQ_REASON_CALL,
|
|
[CHREQ_T_CALL_REEST_TCH_H_DBL] = GSM_CHREQ_REASON_CALL,
|
|
[CHREQ_T_SDCCH] = GSM_CHREQ_REASON_OTHER,
|
|
[CHREQ_T_TCH_F] = GSM_CHREQ_REASON_OTHER,
|
|
[CHREQ_T_VOICE_CALL_TCH_H] = GSM_CHREQ_REASON_OTHER,
|
|
[CHREQ_T_DATA_CALL_TCH_H] = GSM_CHREQ_REASON_OTHER,
|
|
[CHREQ_T_LOCATION_UPD] = GSM_CHREQ_REASON_LOCATION_UPD,
|
|
[CHREQ_T_PAG_R_ANY] = GSM_CHREQ_REASON_PAG,
|
|
[CHREQ_T_PAG_R_TCH_F] = GSM_CHREQ_REASON_PAG,
|
|
[CHREQ_T_PAG_R_TCH_FH] = GSM_CHREQ_REASON_PAG,
|
|
};
|
|
|
|
enum gsm_chan_t get_ctype_by_chreq(struct gsm_bts *bts, u_int8_t ra)
|
|
{
|
|
int i;
|
|
/* FIXME: determine if we set NECI = 0 in the BTS SI4 */
|
|
|
|
for (i = 0; i < ARRAY_SIZE(chreq_type_neci0); i++) {
|
|
const struct chreq *chr = &chreq_type_neci0[i];
|
|
if ((ra & chr->mask) == chr->val)
|
|
return ctype_by_chreq[chr->type];
|
|
}
|
|
fprintf(stderr, "Unknown CHANNEL REQUEST RQD 0x%02x\n", ra);
|
|
return GSM_LCHAN_SDCCH;
|
|
}
|
|
|
|
enum gsm_chreq_reason_t get_reason_by_chreq(struct gsm_bts *bts, u_int8_t ra)
|
|
{
|
|
int i;
|
|
/* FIXME: determine if we set NECI = 0 in the BTS SI4 */
|
|
|
|
for (i = 0; i < ARRAY_SIZE(chreq_type_neci0); i++) {
|
|
const struct chreq *chr = &chreq_type_neci0[i];
|
|
if ((ra & chr->mask) == chr->val)
|
|
return reason_by_chreq[chr->type];
|
|
}
|
|
fprintf(stderr, "Unknown CHANNEL REQUEST REASON 0x%02x\n", ra);
|
|
return GSM_CHREQ_REASON_OTHER;
|
|
}
|