600 lines
16 KiB
C
600 lines
16 KiB
C
/* GSM 04.08 System Information (SI) encoding and decoding
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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) 2008-2010 by Harald Welte <laforge@gnumonks.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 <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <openbsc/gsm_04_08.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/abis_rsl.h>
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#include <openbsc/rest_octets.h>
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#include <osmocore/bitvec.h>
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#include <osmocore/utils.h>
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#include <openbsc/debug.h>
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#define GSM48_CELL_CHAN_DESC_SIZE 16
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#define GSM_MACBLOCK_PADDING 0x2b
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/* verify the sizes of the system information type structs */
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/* rest octets are not part of the struct */
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static_assert(sizeof(struct gsm48_system_information_type_header) == 3, _si_header_size);
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static_assert(sizeof(struct gsm48_rach_control) == 3, _si_rach_control);
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static_assert(sizeof(struct gsm48_system_information_type_1) == 22, _si1_size);
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static_assert(sizeof(struct gsm48_system_information_type_2) == 23, _si2_size);
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static_assert(sizeof(struct gsm48_system_information_type_3) == 19, _si3_size);
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static_assert(sizeof(struct gsm48_system_information_type_4) == 13, _si4_size);
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/* bs11 forgot the l2 len, 0-6 rest octets */
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static_assert(sizeof(struct gsm48_system_information_type_5) == 18, _si5_size);
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static_assert(sizeof(struct gsm48_system_information_type_6) == 11, _si6_size);
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static_assert(sizeof(struct gsm48_system_information_type_13) == 3, _si13_size);
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/* Frequency Lists as per TS 04.08 10.5.2.13 */
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/* 10.5.2.13.2: Bit map 0 format */
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static int freq_list_bm0_set_arfcn(u_int8_t *chan_list, unsigned int arfcn)
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{
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unsigned int byte, bit;
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if (arfcn > 124 || arfcn < 1) {
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LOGP(DRR, LOGL_ERROR, "Bitmap 0 only supports ARFCN 1...124\n");
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return -EINVAL;
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}
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/* the bitmask is from 1..124, not from 0..123 */
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arfcn--;
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byte = arfcn / 8;
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bit = arfcn % 8;
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chan_list[GSM48_CELL_CHAN_DESC_SIZE-1-byte] |= (1 << bit);
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return 0;
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}
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/* 10.5.2.13.7: Variable bit map format */
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static int freq_list_bmrel_set_arfcn(u_int8_t *chan_list, unsigned int arfcn)
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{
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unsigned int byte, bit;
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unsigned int min_arfcn;
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unsigned int bitno;
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min_arfcn = (chan_list[0] & 1) << 9;
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min_arfcn |= chan_list[1] << 1;
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min_arfcn |= (chan_list[2] >> 7) & 1;
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/* The lower end of our bitmaks is always implicitly included */
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if (arfcn == min_arfcn)
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return 0;
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if (arfcn < min_arfcn) {
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LOGP(DRR, LOGL_ERROR, "arfcn(%u) < min(%u)\n", arfcn, min_arfcn);
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return -EINVAL;
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}
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if (arfcn > min_arfcn + 111) {
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LOGP(DRR, LOGL_ERROR, "arfcn(%u) > min(%u) + 111\n", arfcn, min_arfcn);
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return -EINVAL;
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}
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bitno = (arfcn - min_arfcn);
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byte = bitno / 8;
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bit = bitno % 8;
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chan_list[2 + byte] |= 1 << (7 - bit);
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return 0;
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}
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/* generate a cell channel list as per Section 10.5.2.1b of 04.08 */
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static int bitvec2freq_list(u_int8_t *chan_list, struct bitvec *bv,
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const struct gsm_bts *bts)
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{
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int i, rc, min = 1024, max = -1;
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memset(chan_list, 0, 16);
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/* GSM900-only handsets only support 'bit map 0 format' */
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if (bts->band == GSM_BAND_900) {
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chan_list[0] = 0;
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for (i = 0; i < bv->data_len*8; i++) {
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if (bitvec_get_bit_pos(bv, i)) {
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rc = freq_list_bm0_set_arfcn(chan_list, i);
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if (rc < 0)
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return rc;
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}
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}
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return 0;
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}
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/* We currently only support the 'Variable bitmap format' */
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chan_list[0] = 0x8e;
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for (i = 0; i < bv->data_len*8; i++) {
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if (bitvec_get_bit_pos(bv, i)) {
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if (i < min)
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min = i;
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if (i > max)
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max = i;
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}
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}
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if (max == -1) {
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/* Empty set, use 'bit map 0 format' */
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chan_list[0] = 0;
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return 0;
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}
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if ((max - min) > 111) {
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LOGP(DRR, LOGL_ERROR, "min_arfcn=%u, max_arfcn=%u, "
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"distance > 111\n", min, max);
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return -EINVAL;
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}
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chan_list[0] |= (min >> 9) & 1;
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chan_list[1] = (min >> 1);
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chan_list[2] = (min & 1) << 7;
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for (i = 0; i < bv->data_len*8; i++) {
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if (bitvec_get_bit_pos(bv, i)) {
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rc = freq_list_bmrel_set_arfcn(chan_list, i);
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if (rc < 0)
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return rc;
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}
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}
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return 0;
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}
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/* generate a cell channel list as per Section 10.5.2.1b of 04.08 */
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static int generate_cell_chan_list(u_int8_t *chan_list, struct gsm_bts *bts)
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{
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struct gsm_bts_trx *trx;
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struct bitvec *bv = &bts->si_common.cell_alloc;
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/* Zero-initialize the bit-vector */
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memset(bv->data, 0, bv->data_len);
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/* first we generate a bitvec of all TRX ARFCN's in our BTS */
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llist_for_each_entry(trx, &bts->trx_list, list) {
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unsigned int i, j;
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/* Always add the TRX's ARFCN */
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bitvec_set_bit_pos(bv, trx->arfcn, 1);
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for (i = 0; i < ARRAY_SIZE(trx->ts); i++) {
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struct gsm_bts_trx_ts *ts = &trx->ts[i];
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/* Add any ARFCNs present in hopping channels */
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for (j = 0; j < 1024; j++) {
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if (bitvec_get_bit_pos(&ts->hopping.arfcns, j))
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bitvec_set_bit_pos(bv, j, 1);
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}
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}
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}
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/* then we generate a GSM 04.08 frequency list from the bitvec */
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return bitvec2freq_list(chan_list, bv, bts);
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}
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/* generate a cell channel list as per Section 10.5.2.1b of 04.08 */
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static int generate_bcch_chan_list(u_int8_t *chan_list, struct gsm_bts *bts)
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{
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struct gsm_bts *cur_bts;
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struct bitvec *bv = &bts->si_common.neigh_list;
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/* Zero-initialize the bit-vector */
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memset(bv->data, 0, bv->data_len);
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/* first we generate a bitvec of the BCCH ARFCN's in our BSC */
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llist_for_each_entry(cur_bts, &bts->network->bts_list, list) {
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if (cur_bts == bts)
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continue;
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bitvec_set_bit_pos(bv, cur_bts->c0->arfcn, 1);
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}
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/* then we generate a GSM 04.08 frequency list from the bitvec */
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return bitvec2freq_list(chan_list, bv, bts);
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}
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static int generate_si1(u_int8_t *output, struct gsm_bts *bts)
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{
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int rc;
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struct gsm48_system_information_type_1 *si1 =
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(struct gsm48_system_information_type_1 *) output;
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memset(si1, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
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si1->header.l2_plen = (21 << 2) | 1;
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si1->header.rr_protocol_discriminator = GSM48_PDISC_RR;
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si1->header.skip_indicator = 0;
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si1->header.system_information = GSM48_MT_RR_SYSINFO_1;
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rc = generate_cell_chan_list(si1->cell_channel_description, bts);
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if (rc < 0)
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return rc;
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si1->rach_control = bts->si_common.rach_control;
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/* SI1 Rest Octets (10.5.2.32), contains NCH position */
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rc = rest_octets_si1(si1->rest_octets, NULL);
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return sizeof(*si1) + rc;
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}
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static int generate_si2(u_int8_t *output, struct gsm_bts *bts)
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{
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int rc;
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struct gsm48_system_information_type_2 *si2 =
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(struct gsm48_system_information_type_2 *) output;
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memset(si2, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
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si2->header.l2_plen = (22 << 2) | 1;
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si2->header.rr_protocol_discriminator = GSM48_PDISC_RR;
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si2->header.skip_indicator = 0;
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si2->header.system_information = GSM48_MT_RR_SYSINFO_2;
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rc = generate_bcch_chan_list(si2->bcch_frequency_list, bts);
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if (rc < 0)
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return rc;
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si2->ncc_permitted = bts->si_common.ncc_permitted;
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si2->rach_control = bts->si_common.rach_control;
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return sizeof(*si2);
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}
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static struct gsm48_si_ro_info si_info = {
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.selection_params = {
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.present = 0,
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},
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.power_offset = {
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.present = 0,
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},
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.si2ter_indicator = 0,
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.early_cm_ctrl = 1,
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.scheduling = {
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.present = 0,
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},
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.gprs_ind = {
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.si13_position = 0,
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.ra_colour = 0,
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.present = 1,
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},
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.lsa_params = {
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.present = 0,
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},
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.cell_id = 0, /* FIXME: doesn't the bts have this? */
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.break_ind = 0,
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};
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static int generate_si3(u_int8_t *output, struct gsm_bts *bts)
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{
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int rc;
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struct gsm48_system_information_type_3 *si3 =
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(struct gsm48_system_information_type_3 *) output;
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memset(si3, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
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si3->header.l2_plen = (18 << 2) | 1;
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si3->header.rr_protocol_discriminator = GSM48_PDISC_RR;
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si3->header.skip_indicator = 0;
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si3->header.system_information = GSM48_MT_RR_SYSINFO_3;
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si3->cell_identity = htons(bts->cell_identity);
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gsm48_generate_lai(&si3->lai, bts->network->country_code,
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bts->network->network_code,
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bts->location_area_code);
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si3->control_channel_desc = bts->si_common.chan_desc;
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si3->cell_options = bts->si_common.cell_options;
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si3->cell_sel_par = bts->si_common.cell_sel_par;
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si3->rach_control = bts->si_common.rach_control;
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/* SI3 Rest Octets (10.5.2.34), containing
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CBQ, CELL_RESELECT_OFFSET, TEMPORARY_OFFSET, PENALTY_TIME
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Power Offset, 2ter Indicator, Early Classmark Sending,
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Scheduling if and WHERE, GPRS Indicator, SI13 position */
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rc = rest_octets_si3(si3->rest_octets, &si_info);
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return sizeof(*si3) + rc;
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}
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static int generate_si4(u_int8_t *output, struct gsm_bts *bts)
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{
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int rc;
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struct gsm48_system_information_type_4 *si4 =
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(struct gsm48_system_information_type_4 *) output;
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/* length of all IEs present except SI4 rest octets and l2_plen */
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int l2_plen = sizeof(*si4) - 1;
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memset(si4, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
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si4->header.rr_protocol_discriminator = GSM48_PDISC_RR;
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si4->header.skip_indicator = 0;
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si4->header.system_information = GSM48_MT_RR_SYSINFO_4;
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gsm48_generate_lai(&si4->lai, bts->network->country_code,
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bts->network->network_code,
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bts->location_area_code);
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si4->cell_sel_par = bts->si_common.cell_sel_par;
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si4->rach_control = bts->si_common.rach_control;
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/* Optional: CBCH Channel Description + CBCH Mobile Allocation */
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si4->header.l2_plen = (l2_plen << 2) | 1;
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/* SI4 Rest Octets (10.5.2.35), containing
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Optional Power offset, GPRS Indicator,
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Cell Identity, LSA ID, Selection Parameter */
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rc = rest_octets_si4(si4->data, &si_info);
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return sizeof(*si4) + rc;
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}
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static int generate_si5(u_int8_t *output, struct gsm_bts *bts)
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{
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struct gsm48_system_information_type_5 *si5;
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int rc, l2_plen = 18;
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memset(output, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
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/* ip.access nanoBTS needs l2_plen!! */
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if (is_ipaccess_bts(bts)) {
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*output++ = (l2_plen << 2) | 1;
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l2_plen++;
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}
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si5 = (struct gsm48_system_information_type_5 *) output;
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/* l2 pseudo length, not part of msg: 18 */
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si5->rr_protocol_discriminator = GSM48_PDISC_RR;
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si5->skip_indicator = 0;
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si5->system_information = GSM48_MT_RR_SYSINFO_5;
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rc = generate_bcch_chan_list(si5->bcch_frequency_list, bts);
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if (rc < 0)
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return rc;
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/* 04.08 9.1.37: L2 Pseudo Length of 18 */
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return l2_plen;
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}
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static int generate_si6(u_int8_t *output, struct gsm_bts *bts)
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{
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struct gsm48_system_information_type_6 *si6;
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int l2_plen = 11;
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memset(output, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
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/* ip.access nanoBTS needs l2_plen!! */
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if (is_ipaccess_bts(bts)) {
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*output++ = (l2_plen << 2) | 1;
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l2_plen++;
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}
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si6 = (struct gsm48_system_information_type_6 *) output;
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/* l2 pseudo length, not part of msg: 11 */
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si6->rr_protocol_discriminator = GSM48_PDISC_RR;
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si6->skip_indicator = 0;
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si6->system_information = GSM48_MT_RR_SYSINFO_6;
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si6->cell_identity = htons(bts->cell_identity);
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gsm48_generate_lai(&si6->lai, bts->network->country_code,
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bts->network->network_code,
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bts->location_area_code);
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si6->cell_options = bts->si_common.cell_options;
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si6->ncc_permitted = bts->si_common.ncc_permitted;
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/* SI6 Rest Octets: 10.5.2.35a: PCH / NCH info, VBS/VGCS options */
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return l2_plen;
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}
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static struct gsm48_si13_info si13_default = {
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.cell_opts = {
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.nmo = GPRS_NMO_II,
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.t3168 = 2000,
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.t3192 = 200,
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.drx_timer_max = 3,
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.bs_cv_max = 15,
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.ext_info_present = 1,
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.ext_info = {
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/* The values below are just guesses ! */
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.egprs_supported = 0,
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.use_egprs_p_ch_req = 1,
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.bep_period = 5,
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.pfc_supported = 0,
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.dtm_supported = 0,
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.bss_paging_coordination = 0,
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},
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},
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.pwr_ctrl_pars = {
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.alpha = 10, /* a = 1.0 */
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.t_avg_w = 16,
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.t_avg_t = 16,
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.pc_meas_chan = 0, /* downling measured on CCCH */
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.n_avg_i = 8,
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},
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.bcch_change_mark = 1,
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.si_change_field = 0,
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.pbcch_present = 0,
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{
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.no_pbcch = {
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.rac = 0, /* needs to be patched */
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.spgc_ccch_sup = 0,
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.net_ctrl_ord = 0,
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.prio_acc_thr = 6,
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},
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},
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};
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static int generate_si13(u_int8_t *output, struct gsm_bts *bts)
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{
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struct gsm48_system_information_type_13 *si13 =
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(struct gsm48_system_information_type_13 *) output;
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int ret;
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memset(si13, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
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si13->header.rr_protocol_discriminator = GSM48_PDISC_RR;
|
|
si13->header.skip_indicator = 0;
|
|
si13->header.system_information = GSM48_MT_RR_SYSINFO_13;
|
|
|
|
si13_default.no_pbcch.rac = bts->gprs.rac;
|
|
|
|
ret = rest_octets_si13(si13->rest_octets, &si13_default);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* length is coded in bit 2 an up */
|
|
si13->header.l2_plen = 0x01;
|
|
|
|
return sizeof (*si13) + ret;
|
|
}
|
|
|
|
static const uint8_t sitype2rsl[_MAX_SYSINFO_TYPE] = {
|
|
[SYSINFO_TYPE_1] = RSL_SYSTEM_INFO_1,
|
|
[SYSINFO_TYPE_2] = RSL_SYSTEM_INFO_2,
|
|
[SYSINFO_TYPE_3] = RSL_SYSTEM_INFO_3,
|
|
[SYSINFO_TYPE_4] = RSL_SYSTEM_INFO_4,
|
|
[SYSINFO_TYPE_5] = RSL_SYSTEM_INFO_5,
|
|
[SYSINFO_TYPE_6] = RSL_SYSTEM_INFO_6,
|
|
[SYSINFO_TYPE_7] = RSL_SYSTEM_INFO_7,
|
|
[SYSINFO_TYPE_8] = RSL_SYSTEM_INFO_8,
|
|
[SYSINFO_TYPE_9] = RSL_SYSTEM_INFO_9,
|
|
[SYSINFO_TYPE_10] = RSL_SYSTEM_INFO_10,
|
|
[SYSINFO_TYPE_13] = RSL_SYSTEM_INFO_13,
|
|
[SYSINFO_TYPE_16] = RSL_SYSTEM_INFO_16,
|
|
[SYSINFO_TYPE_17] = RSL_SYSTEM_INFO_17,
|
|
[SYSINFO_TYPE_18] = RSL_SYSTEM_INFO_18,
|
|
[SYSINFO_TYPE_19] = RSL_SYSTEM_INFO_19,
|
|
[SYSINFO_TYPE_20] = RSL_SYSTEM_INFO_20,
|
|
[SYSINFO_TYPE_2bis] = RSL_SYSTEM_INFO_2bis,
|
|
[SYSINFO_TYPE_2ter] = RSL_SYSTEM_INFO_2ter,
|
|
[SYSINFO_TYPE_2quater] = RSL_SYSTEM_INFO_2quater,
|
|
[SYSINFO_TYPE_5bis] = RSL_SYSTEM_INFO_5bis,
|
|
[SYSINFO_TYPE_5ter] = RSL_SYSTEM_INFO_5ter,
|
|
};
|
|
|
|
static const uint8_t rsl2sitype[0xff] = {
|
|
[RSL_SYSTEM_INFO_1] = SYSINFO_TYPE_1,
|
|
[RSL_SYSTEM_INFO_2] = SYSINFO_TYPE_2,
|
|
[RSL_SYSTEM_INFO_3] = SYSINFO_TYPE_3,
|
|
[RSL_SYSTEM_INFO_4] = SYSINFO_TYPE_4,
|
|
[RSL_SYSTEM_INFO_5] = SYSINFO_TYPE_5,
|
|
[RSL_SYSTEM_INFO_6] = SYSINFO_TYPE_6,
|
|
[RSL_SYSTEM_INFO_7] = SYSINFO_TYPE_7,
|
|
[RSL_SYSTEM_INFO_8] = SYSINFO_TYPE_8,
|
|
[RSL_SYSTEM_INFO_9] = SYSINFO_TYPE_9,
|
|
[RSL_SYSTEM_INFO_10] = SYSINFO_TYPE_10,
|
|
[RSL_SYSTEM_INFO_13] = SYSINFO_TYPE_13,
|
|
[RSL_SYSTEM_INFO_16] = SYSINFO_TYPE_16,
|
|
[RSL_SYSTEM_INFO_17] = SYSINFO_TYPE_17,
|
|
[RSL_SYSTEM_INFO_18] = SYSINFO_TYPE_18,
|
|
[RSL_SYSTEM_INFO_19] = SYSINFO_TYPE_19,
|
|
[RSL_SYSTEM_INFO_20] = SYSINFO_TYPE_20,
|
|
[RSL_SYSTEM_INFO_2bis] = SYSINFO_TYPE_2bis,
|
|
[RSL_SYSTEM_INFO_2ter] = SYSINFO_TYPE_2ter,
|
|
[RSL_SYSTEM_INFO_2quater] = SYSINFO_TYPE_2quater,
|
|
[RSL_SYSTEM_INFO_5bis] = SYSINFO_TYPE_5bis,
|
|
[RSL_SYSTEM_INFO_5ter] = SYSINFO_TYPE_5ter,
|
|
};
|
|
|
|
typedef int (*gen_si_fn_t)(uint8_t *output, struct gsm_bts *bts);
|
|
|
|
static const gen_si_fn_t gen_si_fn[_MAX_SYSINFO_TYPE] = {
|
|
[SYSINFO_TYPE_1] = &generate_si1,
|
|
[SYSINFO_TYPE_2] = &generate_si2,
|
|
[SYSINFO_TYPE_3] = &generate_si3,
|
|
[SYSINFO_TYPE_4] = &generate_si4,
|
|
[SYSINFO_TYPE_5] = &generate_si5,
|
|
[SYSINFO_TYPE_6] = &generate_si6,
|
|
[SYSINFO_TYPE_13] = &generate_si13,
|
|
};
|
|
|
|
const struct value_string osmo_sitype_strs[_MAX_SYSINFO_TYPE] = {
|
|
{ SYSINFO_TYPE_1, "1" },
|
|
{ SYSINFO_TYPE_2, "2" },
|
|
{ SYSINFO_TYPE_3, "3" },
|
|
{ SYSINFO_TYPE_4, "4" },
|
|
{ SYSINFO_TYPE_5, "5" },
|
|
{ SYSINFO_TYPE_6, "6" },
|
|
{ SYSINFO_TYPE_7, "7" },
|
|
{ SYSINFO_TYPE_8, "8" },
|
|
{ SYSINFO_TYPE_9, "9" },
|
|
{ SYSINFO_TYPE_10, "10" },
|
|
{ SYSINFO_TYPE_13, "13" },
|
|
{ SYSINFO_TYPE_16, "16" },
|
|
{ SYSINFO_TYPE_17, "17" },
|
|
{ SYSINFO_TYPE_18, "18" },
|
|
{ SYSINFO_TYPE_19, "19" },
|
|
{ SYSINFO_TYPE_20, "20" },
|
|
{ SYSINFO_TYPE_2bis, "2bis" },
|
|
{ SYSINFO_TYPE_2ter, "2ter" },
|
|
{ SYSINFO_TYPE_2quater, "2quater" },
|
|
{ SYSINFO_TYPE_5bis, "5bis" },
|
|
{ SYSINFO_TYPE_5ter, "5ter" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
uint8_t gsm_sitype2rsl(enum osmo_sysinfo_type si_type)
|
|
{
|
|
return sitype2rsl[si_type];
|
|
}
|
|
|
|
const char *gsm_sitype_name(enum osmo_sysinfo_type si_type)
|
|
{
|
|
return get_value_string(osmo_sitype_strs, si_type);
|
|
}
|
|
|
|
int gsm_generate_si(struct gsm_bts *bts, enum osmo_sysinfo_type si_type)
|
|
{
|
|
gen_si_fn_t gen_si;
|
|
|
|
switch (bts->gprs.mode) {
|
|
case BTS_GPRS_EGPRS:
|
|
si13_default.cell_opts.ext_info_present = 1;
|
|
si13_default.cell_opts.ext_info.egprs_supported = 1;
|
|
/* fallthrough */
|
|
case BTS_GPRS_GPRS:
|
|
si_info.gprs_ind.present = 1;
|
|
break;
|
|
case BTS_GPRS_NONE:
|
|
si_info.gprs_ind.present = 0;
|
|
break;
|
|
}
|
|
|
|
memcpy(&si_info.selection_params,
|
|
&bts->si_common.cell_ro_sel_par,
|
|
sizeof(struct gsm48_si_selection_params));
|
|
|
|
gen_si = gen_si_fn[si_type];
|
|
if (!gen_si)
|
|
return -EINVAL;
|
|
|
|
return gen_si(bts->si_buf[si_type], bts);
|
|
}
|