577 lines
16 KiB
C
577 lines
16 KiB
C
/* A hackish minimal BSC (+MSC +HLR) implementation */
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/* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org>
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* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
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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 Affero General Public License as published by
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* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <osmocom/bsc/gsm_data.h>
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#include <osmocom/gsm/gsm_utils.h>
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#include <osmocom/bsc/abis_rsl.h>
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#include <osmocom/bsc/abis_nm.h>
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#include <osmocom/bsc/debug.h>
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#include <osmocom/bsc/misdn.h>
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#include <osmocom/vty/telnet_interface.h>
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#include <osmocom/vty/ports.h>
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#include <osmocom/bsc/system_information.h>
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#include <osmocom/bsc/paging.h>
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#include <osmocom/bsc/signal.h>
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#include <osmocom/bsc/chan_alloc.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/bsc/ipaccess.h>
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#include <osmocom/gsm/sysinfo.h>
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#include <osmocom/bsc/e1_config.h>
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#include <osmocom/bsc/common_bsc.h>
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#include <osmocom/bsc/pcu_if.h>
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#include <time.h>
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#include <limits.h>
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#include <stdbool.h>
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/* global pointer to the gsm network data structure */
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extern struct gsm_network *bsc_gsmnet;
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/* Callback function for NACK on the OML NM */
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static int oml_msg_nack(struct nm_nack_signal_data *nack)
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{
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if (nack->mt == NM_MT_GET_ATTR_NACK) {
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LOGP(DNM, LOGL_ERROR, "BTS%u does not support Get Attributes "
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"OML message.\n", nack->bts->nr);
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return 0;
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}
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if (nack->mt == NM_MT_SET_BTS_ATTR_NACK)
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LOGP(DNM, LOGL_ERROR, "Failed to set BTS attributes. That is fatal. "
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"Was the bts type and frequency properly specified?\n");
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else
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LOGP(DNM, LOGL_ERROR, "Got %s NACK going to drop the OML links.\n",
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abis_nm_nack_name(nack->mt));
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if (!nack->bts) {
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LOGP(DNM, LOGL_ERROR, "Unknown bts. Can not drop it.\n");
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return 0;
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}
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if (is_ipaccess_bts(nack->bts))
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ipaccess_drop_oml(nack->bts);
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return 0;
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}
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/* Callback function to be called every time we receive a signal from NM */
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static int nm_sig_cb(unsigned int subsys, unsigned int signal,
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void *handler_data, void *signal_data)
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{
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struct nm_nack_signal_data *nack;
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switch (signal) {
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case S_NM_NACK:
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nack = signal_data;
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return oml_msg_nack(nack);
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default:
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break;
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}
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return 0;
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}
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int bsc_shutdown_net(struct gsm_network *net)
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{
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struct gsm_bts *bts;
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llist_for_each_entry(bts, &net->bts_list, list) {
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LOGP(DNM, LOGL_NOTICE, "shutting down OML for BTS %u\n", bts->nr);
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osmo_signal_dispatch(SS_L_GLOBAL, S_GLOBAL_BTS_CLOSE_OM, bts);
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}
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return 0;
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}
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unsigned long long bts_uptime(const struct gsm_bts *bts)
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{
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struct timespec tp;
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if (!bts->uptime || !bts->oml_link) {
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LOGP(DNM, LOGL_ERROR, "BTS %u OML link uptime unavailable\n", bts->nr);
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return 0;
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}
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if (clock_gettime(CLOCK_MONOTONIC, &tp) != 0) {
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LOGP(DNM, LOGL_ERROR, "BTS %u uptime computation failure: %s\n", bts->nr, strerror(errno));
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return 0;
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}
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/* monotonic clock helps to ensure that the conversion is valid */
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return difftime(tp.tv_sec, bts->uptime);
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}
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static int rsl_si(struct gsm_bts_trx *trx, enum osmo_sysinfo_type i, int si_len)
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{
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struct gsm_bts *bts = trx->bts;
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int rc, j;
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if (si_len) {
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DEBUGP(DRR, "SI%s: %s\n", get_value_string(osmo_sitype_strs, i),
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osmo_hexdump(GSM_BTS_SI(bts, i), GSM_MACBLOCK_LEN));
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} else
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DEBUGP(DRR, "SI%s: OFF\n", get_value_string(osmo_sitype_strs, i));
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switch (i) {
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case SYSINFO_TYPE_5:
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case SYSINFO_TYPE_5bis:
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case SYSINFO_TYPE_5ter:
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case SYSINFO_TYPE_6:
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rc = rsl_sacch_filling(trx, osmo_sitype2rsl(i),
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si_len ? GSM_BTS_SI(bts, i) : NULL, si_len);
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break;
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case SYSINFO_TYPE_2quater:
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if (si_len == 0) {
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rc = rsl_bcch_info(trx, i, NULL, 0);
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break;
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}
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rc = 0;
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for (j = 0; j <= bts->si2q_count; j++)
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rc = rsl_bcch_info(trx, i, (const uint8_t *)GSM_BTS_SI2Q(bts, j), GSM_MACBLOCK_LEN);
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break;
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default:
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rc = rsl_bcch_info(trx, i, si_len ? GSM_BTS_SI(bts, i) : NULL, si_len);
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break;
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}
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return rc;
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}
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/* set all system information types for a TRX */
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int gsm_bts_trx_set_system_infos(struct gsm_bts_trx *trx)
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{
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int i, rc;
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struct gsm_bts *bts = trx->bts;
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uint8_t gen_si[_MAX_SYSINFO_TYPE], n_si = 0, n;
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int si_len[_MAX_SYSINFO_TYPE];
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bts->si_common.cell_sel_par.ms_txpwr_max_ccch =
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ms_pwr_ctl_lvl(bts->band, bts->ms_max_power);
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bts->si_common.cell_sel_par.neci = bts->network->neci;
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/* Zero/forget the state of the dynamically computed SIs, leeping the static ones */
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bts->si_valid = bts->si_mode_static;
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/* First, we determine which of the SI messages we actually need */
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if (trx == bts->c0) {
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/* 1...4 are always present on a C0 TRX */
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gen_si[n_si++] = SYSINFO_TYPE_1;
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gen_si[n_si++] = SYSINFO_TYPE_2;
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gen_si[n_si++] = SYSINFO_TYPE_2bis;
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gen_si[n_si++] = SYSINFO_TYPE_2ter;
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gen_si[n_si++] = SYSINFO_TYPE_2quater;
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gen_si[n_si++] = SYSINFO_TYPE_3;
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gen_si[n_si++] = SYSINFO_TYPE_4;
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/* 13 is always present on a C0 TRX of a GPRS BTS */
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if (bts->gprs.mode != BTS_GPRS_NONE)
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gen_si[n_si++] = SYSINFO_TYPE_13;
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}
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/* 5 and 6 are always present on every TRX */
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gen_si[n_si++] = SYSINFO_TYPE_5;
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gen_si[n_si++] = SYSINFO_TYPE_5bis;
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gen_si[n_si++] = SYSINFO_TYPE_5ter;
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gen_si[n_si++] = SYSINFO_TYPE_6;
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/* Second, we generate the selected SI via RSL */
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for (n = 0; n < n_si; n++) {
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i = gen_si[n];
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/* Only generate SI if this SI is not in "static" (user-defined) mode */
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if (!(bts->si_mode_static & (1 << i))) {
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/* Set SI as being valid. gsm_generate_si() might unset
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* it, if SI is not required. */
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bts->si_valid |= (1 << i);
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rc = gsm_generate_si(bts, i);
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if (rc < 0)
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goto err_out;
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si_len[i] = rc;
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} else {
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if (i == SYSINFO_TYPE_5 || i == SYSINFO_TYPE_5bis
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|| i == SYSINFO_TYPE_5ter)
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si_len[i] = 18;
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else if (i == SYSINFO_TYPE_6)
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si_len[i] = 11;
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else
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si_len[i] = 23;
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}
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}
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/* Third, we send the selected SI via RSL */
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for (n = 0; n < n_si; n++) {
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i = gen_si[n];
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/* if we don't currently have this SI, we send a zero-length
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* RSL BCCH FILLING / SACCH FILLING * in order to deactivate
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* the SI, in case it might have previously been active */
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if (!GSM_BTS_HAS_SI(bts, i))
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rc = rsl_si(trx, i, 0);
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else
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rc = rsl_si(trx, i, si_len[i]);
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if (rc < 0)
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return rc;
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}
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/* Make sure the PCU is aware (in case anything GPRS related has
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* changed in SI */
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pcu_info_update(bts);
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return 0;
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err_out:
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LOGP(DRR, LOGL_ERROR, "Cannot generate SI%s for BTS %u: error <%s>, "
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"most likely a problem with neighbor cell list generation\n",
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get_value_string(osmo_sitype_strs, i), bts->nr, strerror(-rc));
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return rc;
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}
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/* set all system information types for a BTS */
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int gsm_bts_set_system_infos(struct gsm_bts *bts)
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{
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struct gsm_bts_trx *trx;
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/* Generate a new ID */
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bts->bcch_change_mark += 1;
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bts->bcch_change_mark %= 0x7;
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llist_for_each_entry(trx, &bts->trx_list, list) {
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int rc;
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rc = gsm_bts_trx_set_system_infos(trx);
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if (rc != 0)
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return rc;
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}
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return 0;
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}
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/* Produce a MA as specified in 10.5.2.21 */
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static int generate_ma_for_ts(struct gsm_bts_trx_ts *ts)
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{
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/* we have three bitvecs: the per-timeslot ARFCNs, the cell chan ARFCNs
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* and the MA */
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struct bitvec *cell_chan = &ts->trx->bts->si_common.cell_alloc;
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struct bitvec *ts_arfcn = &ts->hopping.arfcns;
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struct bitvec *ma = &ts->hopping.ma;
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unsigned int num_cell_arfcns, bitnum, n_chan;
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int i;
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/* re-set the MA to all-zero */
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ma->cur_bit = 0;
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ts->hopping.ma_len = 0;
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memset(ma->data, 0, ma->data_len);
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if (!ts->hopping.enabled)
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return 0;
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/* count the number of ARFCNs in the cell channel allocation */
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num_cell_arfcns = 0;
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for (i = 0; i < 1024; i++) {
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if (bitvec_get_bit_pos(cell_chan, i))
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num_cell_arfcns++;
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}
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/* pad it to octet-aligned number of bits */
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ts->hopping.ma_len = num_cell_arfcns / 8;
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if (num_cell_arfcns % 8)
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ts->hopping.ma_len++;
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n_chan = 0;
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for (i = 0; i < 1024; i++) {
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if (!bitvec_get_bit_pos(cell_chan, i))
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continue;
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/* set the corresponding bit in the MA */
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bitnum = (ts->hopping.ma_len * 8) - 1 - n_chan;
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if (bitvec_get_bit_pos(ts_arfcn, i))
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bitvec_set_bit_pos(ma, bitnum, 1);
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else
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bitvec_set_bit_pos(ma, bitnum, 0);
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n_chan++;
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}
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/* ARFCN 0 is special: It is coded last in the bitmask */
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if (bitvec_get_bit_pos(cell_chan, 0)) {
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n_chan++;
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/* set the corresponding bit in the MA */
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bitnum = (ts->hopping.ma_len * 8) - 1 - n_chan;
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if (bitvec_get_bit_pos(ts_arfcn, 0))
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bitvec_set_bit_pos(ma, bitnum, 1);
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else
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bitvec_set_bit_pos(ma, bitnum, 0);
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}
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return 0;
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}
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static void bootstrap_rsl(struct gsm_bts_trx *trx)
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{
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unsigned int i;
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LOGP(DRSL, LOGL_NOTICE, "bootstrapping RSL for BTS/TRX (%u/%u) "
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"on ARFCN %u using MCC=%u MNC=%u LAC=%u CID=%u BSIC=%u\n",
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trx->bts->nr, trx->nr, trx->arfcn, bsc_gsmnet->country_code,
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bsc_gsmnet->network_code, trx->bts->location_area_code,
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trx->bts->cell_identity, trx->bts->bsic);
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if (trx->bts->type == GSM_BTS_TYPE_NOKIA_SITE) {
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rsl_nokia_si_begin(trx);
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}
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gsm_bts_trx_set_system_infos(trx);
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if (trx->bts->type == GSM_BTS_TYPE_NOKIA_SITE) {
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/* channel unspecific, power reduction in 2 dB steps */
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rsl_bs_power_control(trx, 0xFF, trx->max_power_red / 2);
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rsl_nokia_si_end(trx);
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}
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for (i = 0; i < ARRAY_SIZE(trx->ts); i++)
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generate_ma_for_ts(&trx->ts[i]);
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}
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/* Callback function to be called every time we receive a signal from INPUT */
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static int inp_sig_cb(unsigned int subsys, unsigned int signal,
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void *handler_data, void *signal_data)
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{
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struct input_signal_data *isd = signal_data;
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struct gsm_bts_trx *trx = isd->trx;
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int ts_no, lchan_no;
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/* N. B: we rely on attribute order when parsing response in abis_nm_rx_get_attr_resp() */
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const uint8_t bts_attr[] = { NM_ATT_MANUF_ID, NM_ATT_SW_CONFIG, };
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const uint8_t trx_attr[] = { NM_ATT_MANUF_STATE, NM_ATT_SW_CONFIG, };
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/* we should not request more attributes than we're ready to handle */
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OSMO_ASSERT(sizeof(bts_attr) < MAX_BTS_ATTR);
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OSMO_ASSERT(sizeof(trx_attr) < MAX_BTS_ATTR);
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if (subsys != SS_L_INPUT)
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return -EINVAL;
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LOGP(DLMI, LOGL_DEBUG, "%s(): Input signal '%s' received\n", __func__,
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get_value_string(e1inp_signal_names, signal));
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switch (signal) {
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case S_L_INP_TEI_UP:
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if (isd->link_type == E1INP_SIGN_OML) {
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/* TODO: this is required for the Nokia BTS, hopping is configured
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during OML, other MA is not set. */
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struct gsm_bts_trx *cur_trx;
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/* was static in system_information.c */
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extern int generate_cell_chan_list(uint8_t *chan_list, struct gsm_bts *bts);
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uint8_t ca[20];
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/* has to be called before generate_ma_for_ts to
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set bts->si_common.cell_alloc */
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generate_cell_chan_list(ca, trx->bts);
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/* Request generic BTS-level attributes */
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abis_nm_get_attr(trx->bts, NM_OC_BTS, 0xFF, 0xFF, 0xFF, bts_attr, sizeof(bts_attr));
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llist_for_each_entry(cur_trx, &trx->bts->trx_list, list) {
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int i;
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/* Request TRX-level attributes */
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abis_nm_get_attr(cur_trx->bts, NM_OC_BASEB_TRANSC, 0, cur_trx->nr, 0xFF,
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trx_attr, sizeof(trx_attr));
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for (i = 0; i < ARRAY_SIZE(cur_trx->ts); i++)
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generate_ma_for_ts(&cur_trx->ts[i]);
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}
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}
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if (isd->link_type == E1INP_SIGN_RSL)
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bootstrap_rsl(trx);
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break;
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case S_L_INP_TEI_DN:
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LOGP(DLMI, LOGL_ERROR, "Lost some E1 TEI link: %d %p\n", isd->link_type, trx);
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if (isd->link_type == E1INP_SIGN_OML)
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rate_ctr_inc(&trx->bts->bts_ctrs->ctr[BTS_CTR_BTS_OML_FAIL]);
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else if (isd->link_type == E1INP_SIGN_RSL)
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rate_ctr_inc(&trx->bts->bts_ctrs->ctr[BTS_CTR_BTS_RSL_FAIL]);
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/*
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* free all allocated channels. change the nm_state so the
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* trx and trx_ts becomes unusable and chan_alloc.c can not
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* allocate from it.
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*/
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for (ts_no = 0; ts_no < ARRAY_SIZE(trx->ts); ++ts_no) {
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struct gsm_bts_trx_ts *ts = &trx->ts[ts_no];
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for (lchan_no = 0; lchan_no < ARRAY_SIZE(ts->lchan); ++lchan_no) {
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if (ts->lchan[lchan_no].state != LCHAN_S_NONE)
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lchan_free(&ts->lchan[lchan_no]);
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lchan_reset(&ts->lchan[lchan_no]);
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}
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}
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gsm_bts_mo_reset(trx->bts);
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abis_nm_clear_queue(trx->bts);
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break;
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default:
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break;
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}
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return 0;
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}
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static int bootstrap_bts(struct gsm_bts *bts)
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{
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int i, n;
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if (!bts->model)
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return -EFAULT;
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if (bts->model->start && !bts->model->started) {
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int ret = bts->model->start(bts->network);
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if (ret < 0)
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return ret;
|
|
|
|
bts->model->started = true;
|
|
}
|
|
|
|
/* FIXME: What about secondary TRX of a BTS? What about a BTS that has TRX
|
|
* in different bands? Why is 'band' a parameter of the BTS and not of the TRX? */
|
|
switch (bts->band) {
|
|
case GSM_BAND_1800:
|
|
if (bts->c0->arfcn < 512 || bts->c0->arfcn > 885) {
|
|
LOGP(DNM, LOGL_ERROR, "GSM1800 channel must be between 512-885.\n");
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
case GSM_BAND_1900:
|
|
if (bts->c0->arfcn < 512 || bts->c0->arfcn > 810) {
|
|
LOGP(DNM, LOGL_ERROR, "GSM1900 channel must be between 512-810.\n");
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
case GSM_BAND_900:
|
|
if ((bts->c0->arfcn > 124 && bts->c0->arfcn < 955) ||
|
|
bts->c0->arfcn > 1023) {
|
|
LOGP(DNM, LOGL_ERROR, "GSM900 channel must be between 0-124, 955-1023.\n");
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
case GSM_BAND_850:
|
|
if (bts->c0->arfcn < 128 || bts->c0->arfcn > 251) {
|
|
LOGP(DNM, LOGL_ERROR, "GSM850 channel must be between 128-251.\n");
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
default:
|
|
LOGP(DNM, LOGL_ERROR, "Unsupported frequency band.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Control Channel Description is set from vty/config */
|
|
|
|
/* T3212 is set from vty/config */
|
|
|
|
/* Set ccch config by looking at ts config */
|
|
for (n=0, i=0; i<8; i++)
|
|
n += bts->c0->ts[i].pchan == GSM_PCHAN_CCCH ? 1 : 0;
|
|
|
|
/* Indicate R99 MSC in SI3 */
|
|
bts->si_common.chan_desc.mscr = 1;
|
|
|
|
switch (n) {
|
|
case 0:
|
|
bts->si_common.chan_desc.ccch_conf = RSL_BCCH_CCCH_CONF_1_C;
|
|
/* Limit reserved block to 2 on combined channel according to
|
|
3GPP TS 44.018 Table 10.5.2.11.1 */
|
|
if (bts->si_common.chan_desc.bs_ag_blks_res > 2) {
|
|
LOGP(DNM, LOGL_NOTICE, "CCCH is combined with SDCCHs, "
|
|
"reducing BS-AG-BLKS-RES value %d -> 2\n",
|
|
bts->si_common.chan_desc.bs_ag_blks_res);
|
|
bts->si_common.chan_desc.bs_ag_blks_res = 2;
|
|
}
|
|
break;
|
|
case 1:
|
|
bts->si_common.chan_desc.ccch_conf = RSL_BCCH_CCCH_CONF_1_NC;
|
|
break;
|
|
case 2:
|
|
bts->si_common.chan_desc.ccch_conf = RSL_BCCH_CCCH_CONF_2_NC;
|
|
break;
|
|
case 3:
|
|
bts->si_common.chan_desc.ccch_conf = RSL_BCCH_CCCH_CONF_3_NC;
|
|
break;
|
|
case 4:
|
|
bts->si_common.chan_desc.ccch_conf = RSL_BCCH_CCCH_CONF_4_NC;
|
|
break;
|
|
default:
|
|
LOGP(DNM, LOGL_ERROR, "Unsupported CCCH timeslot configuration\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
bts->si_common.cell_options.pwrc = 0; /* PWRC not set */
|
|
|
|
bts->si_common.cell_sel_par.acs = 0;
|
|
|
|
bts->si_common.ncc_permitted = 0xff;
|
|
|
|
/* Initialize the BTS state */
|
|
gsm_bts_mo_reset(bts);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int bsc_network_alloc(void)
|
|
{
|
|
/* initialize our data structures */
|
|
bsc_gsmnet = bsc_network_init(tall_bsc_ctx, 1, 1);
|
|
if (!bsc_gsmnet)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int bsc_network_configure(const char *config_file)
|
|
{
|
|
struct gsm_bts *bts;
|
|
int rc;
|
|
|
|
rc = vty_read_config_file(config_file, NULL);
|
|
if (rc < 0) {
|
|
LOGP(DNM, LOGL_FATAL, "Failed to parse the config file: '%s'\n", config_file);
|
|
return rc;
|
|
}
|
|
|
|
/* start telnet after reading config for vty_get_bind_addr() */
|
|
rc = telnet_init_dynif(tall_bsc_ctx, bsc_gsmnet, vty_get_bind_addr(),
|
|
OSMO_VTY_PORT_NITB_BSC);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
osmo_signal_register_handler(SS_NM, nm_sig_cb, NULL);
|
|
osmo_signal_register_handler(SS_L_INPUT, inp_sig_cb, NULL);
|
|
|
|
llist_for_each_entry(bts, &bsc_gsmnet->bts_list, list) {
|
|
rc = bootstrap_bts(bts);
|
|
if (rc < 0) {
|
|
LOGP(DNM, LOGL_FATAL, "Error bootstrapping BTS\n");
|
|
return rc;
|
|
}
|
|
rc = e1_reconfig_bts(bts);
|
|
if (rc < 0) {
|
|
LOGP(DNM, LOGL_FATAL, "Error enabling E1 input driver\n");
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|