diff options
Diffstat (limited to 'openbsc/src/libbsc/system_information.c')
| -rw-r--r-- | openbsc/src/libbsc/system_information.c | 1169 |
1 files changed, 0 insertions, 1169 deletions
diff --git a/openbsc/src/libbsc/system_information.c b/openbsc/src/libbsc/system_information.c deleted file mode 100644 index dcabbbdd1..000000000 --- a/openbsc/src/libbsc/system_information.c +++ /dev/null @@ -1,1169 +0,0 @@ -/* GSM 04.08 System Information (SI) encoding and decoding - * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */ - -/* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org> - * (C) 2012 Holger Hans Peter Freyther - * - * All Rights Reserved - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU Affero General Public License as published by - * the Free Software Foundation; either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU Affero General Public License for more details. - * - * You should have received a copy of the GNU Affero General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - * - */ - -#include <errno.h> -#include <string.h> -#include <stdio.h> -#include <netinet/in.h> -#include <stdbool.h> - -#include <osmocom/core/bitvec.h> -#include <osmocom/core/utils.h> -#include <osmocom/gsm/sysinfo.h> - -#include <openbsc/debug.h> -#include <openbsc/gsm_04_08.h> -#include <openbsc/gsm_data.h> -#include <openbsc/abis_rsl.h> -#include <openbsc/rest_octets.h> -#include <openbsc/arfcn_range_encode.h> - -/* - * DCS1800 and PCS1900 have overlapping ARFCNs. We would need to set the - * ARFCN_PCS flag on the 1900 ARFCNs but this would increase cell_alloc - * and other arrays to make sure (ARFCN_PCS + 1024)/8 ARFCNs fit into the - * array. DCS1800 and PCS1900 can not be used at the same time so conserve - * memory and do the below. - */ -static int band_compatible(const struct gsm_bts *bts, int arfcn) -{ - enum gsm_band band = gsm_arfcn2band(arfcn); - - /* normal case */ - if (band == bts->band) - return 1; - /* deal with ARFCN_PCS not set */ - if (band == GSM_BAND_1800 && bts->band == GSM_BAND_1900) - return 1; - - return 0; -} - -static int is_dcs_net(const struct gsm_bts *bts) -{ - if (bts->band == GSM_BAND_850) - return 0; - if (bts->band == GSM_BAND_1900) - return 0; - return 1; -} - -/* Return p(n) for given NR_OF_TDD_CELLS - see Table 9.1.54.1a, 3GPP TS 44.018 */ -unsigned range1024_p(unsigned n) -{ - switch (n) { - case 0: return 0; - case 1: return 10; - case 2: return 19; - case 3: return 28; - case 4: return 36; - case 5: return 44; - case 6: return 52; - case 7: return 60; - case 8: return 67; - case 9: return 74; - case 10: return 81; - case 11: return 88; - case 12: return 95; - case 13: return 102; - case 14: return 109; - case 15: return 116; - case 16: return 122; - default: return 0; - } -} - -/* Return q(m) for given NR_OF_TDD_CELLS - see Table 9.1.54.1b, 3GPP TS 44.018 */ -unsigned range512_q(unsigned m) -{ - switch (m) { - case 0: return 0; - case 1: return 9; - case 2: return 17; - case 3: return 25; - case 4: return 32; - case 5: return 39; - case 6: return 46; - case 7: return 53; - case 8: return 59; - case 9: return 65; - case 10: return 71; - case 11: return 77; - case 12: return 83; - case 13: return 89; - case 14: return 95; - case 15: return 101; - case 16: return 106; - case 17: return 111; - case 18: return 116; - case 19: return 121; - case 20: return 126; - default: return 0; - } -} - -size_t si2q_earfcn_count(const struct osmo_earfcn_si2q *e) -{ - unsigned i, ret = 0; - - if (!e) - return 0; - - for (i = 0; i < e->length; i++) - if (e->arfcn[i] != OSMO_EARFCN_INVALID) - ret++; - - return ret; -} - -/* generate SI2quater messages, return rest octets length of last generated message or negative error code */ -static int make_si2quaters(struct gsm_bts *bts, bool counting) -{ - int rc; - bool memory_exceeded = true; - struct gsm48_system_information_type_2quater *si2q; - - for (bts->si2q_index = 0; bts->si2q_index < SI2Q_MAX_NUM; bts->si2q_index++) { - si2q = GSM_BTS_SI2Q(bts, bts->si2q_index); - if (counting) { /* that's legitimate if we're called for counting purpose: */ - if (bts->si2q_count < bts->si2q_index) - bts->si2q_count = bts->si2q_index; - } else { - memset(si2q, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); - - si2q->header.l2_plen = GSM48_LEN2PLEN(22); - si2q->header.rr_protocol_discriminator = GSM48_PDISC_RR; - si2q->header.skip_indicator = 0; - si2q->header.system_information = GSM48_MT_RR_SYSINFO_2quater; - } - - rc = rest_octets_si2quater(si2q->rest_octets, bts); - if (rc < 0) - return rc; - - if (bts->u_offset >= bts->si_common.uarfcn_length && - bts->e_offset >= si2q_earfcn_count(&bts->si_common.si2quater_neigh_list)) { - memory_exceeded = false; - break; - } - } - - if (memory_exceeded) - return -ENOMEM; - - return rc; -} - -/* we generate SI2q rest octets twice to get proper estimation but it's one time cost anyway */ -uint8_t si2q_num(struct gsm_bts *bts) -{ - int rc = make_si2quaters(bts, true); - uint8_t num = bts->si2q_index + 1; /* number of SI2quater messages */ - - /* N. B: si2q_num() should NEVER be called during actualSI2q rest octets generation - we're not re-entrant because of the following code: */ - bts->u_offset = 0; - bts->e_offset = 0; - - if (rc < 0) - return 0xFF; /* return impossible index as an indicator of error in generating SI2quater */ - - return num; -} - -/* 3GPP TS 44.018, Table 9.1.54.1 - prepend diversity bit to scrambling code */ -static inline uint16_t encode_fdd(uint16_t scramble, bool diversity) -{ - if (diversity) - return scramble | (1 << 9); - return scramble; -} - -int bts_earfcn_add(struct gsm_bts *bts, uint16_t earfcn, uint8_t thresh_hi, uint8_t thresh_lo, uint8_t prio, - uint8_t qrx, uint8_t meas_bw) -{ - struct osmo_earfcn_si2q *e = &bts->si_common.si2quater_neigh_list; - int r = osmo_earfcn_add(e, earfcn, (meas_bw < EARFCN_MEAS_BW_INVALID) ? meas_bw : OSMO_EARFCN_MEAS_INVALID); - - if (r < 0) - return r; - - if (e->thresh_hi && thresh_hi != e->thresh_hi) - r = 1; - - e->thresh_hi = thresh_hi; - - if (thresh_lo != EARFCN_THRESH_LOW_INVALID) { - if (e->thresh_lo_valid && e->thresh_lo != thresh_lo) - r = EARFCN_THRESH_LOW_INVALID; - e->thresh_lo = thresh_lo; - e->thresh_lo_valid = true; - } - - if (qrx != EARFCN_QRXLV_INVALID) { - if (e->qrxlm_valid && e->qrxlm != qrx) - r = EARFCN_QRXLV_INVALID + 1; - e->qrxlm = qrx; - e->qrxlm_valid = true; - } - - if (prio != EARFCN_PRIO_INVALID) { - if (e->prio_valid && e->prio != prio) - r = EARFCN_PRIO_INVALID; - e->prio = prio; - e->prio_valid = true; - } - - return r; -} - -int bts_uarfcn_del(struct gsm_bts *bts, uint16_t arfcn, uint16_t scramble) -{ - uint16_t sc0 = encode_fdd(scramble, false), sc1 = encode_fdd(scramble, true), - *ual = bts->si_common.data.uarfcn_list, - *scl = bts->si_common.data.scramble_list; - size_t len = bts->si_common.uarfcn_length, i; - for (i = 0; i < len; i++) { - if (arfcn == ual[i] && (sc0 == scl[i] || sc1 == scl[i])) { - /* we rely on the assumption that (uarfcn, scramble) - tuple is unique in the lists */ - if (i != len - 1) { /* move the tail if necessary */ - memmove(ual + i, ual + i + 1, 2 * (len - i + 1)); - memmove(scl + i, scl + i + 1, 2 * (len - i + 1)); - } - break; - } - } - - if (i == len) - return -EINVAL; - - bts->si_common.uarfcn_length--; - return 0; -} - -int bts_uarfcn_add(struct gsm_bts *bts, uint16_t arfcn, uint16_t scramble, bool diversity) -{ - size_t len = bts->si_common.uarfcn_length, i, k = 0; - uint16_t scr, chk, - *ual = bts->si_common.data.uarfcn_list, - *scl = bts->si_common.data.scramble_list, - scramble1 = encode_fdd(scramble, true), - scramble0 = encode_fdd(scramble, false); - - scr = diversity ? scramble1 : scramble0; - chk = diversity ? scramble0 : scramble1; - - if (len == MAX_EARFCN_LIST) - return -ENOMEM; - - for (i = 0; i < len; i++) /* find the position of arfcn if any */ - if (arfcn == ual[i]) - break; - - for (k = 0; i < len; i++) { - if (arfcn == ual[i] && (scr == scl[i] || chk == scl[i])) - return -EADDRINUSE; - if (scr > scl[i]) - k = i + 1; - } - /* we keep lists sorted by scramble code: - insert into appropriate position and move the tail */ - if (len - k) { - memmove(ual + k + 1, ual + k, (len - k) * 2); - memmove(scl + k + 1, scl + k, (len - k) * 2); - } - - ual[k] = arfcn; - scl[k] = scr; - bts->si_common.uarfcn_length++; - - if (si2q_num(bts) <= SI2Q_MAX_NUM) { - bts->si2q_count = si2q_num(bts) - 1; - return 0; - } - - bts_uarfcn_del(bts, arfcn, scramble); - return -ENOSPC; -} - -static inline int use_arfcn(const struct gsm_bts *bts, const bool bis, const bool ter, - const bool pgsm, const int arfcn) -{ - if (bts->force_combined_si) - return !bis && !ter; - if (!bis && !ter && band_compatible(bts, arfcn)) - return 1; - /* Correct but somehow broken with either the nanoBTS or the iPhone5 */ - if (bis && pgsm && band_compatible(bts, arfcn) && (arfcn < 1 || arfcn > 124)) - return 1; - if (ter && !band_compatible(bts, arfcn)) - return 1; - return 0; -} - -/* Frequency Lists as per TS 04.08 10.5.2.13 */ - -/* 10.5.2.13.2: Bit map 0 format */ -static int freq_list_bm0_set_arfcn(uint8_t *chan_list, unsigned int arfcn) -{ - unsigned int byte, bit; - - if (arfcn > 124 || arfcn < 1) { - LOGP(DRR, LOGL_ERROR, "Bitmap 0 only supports ARFCN 1...124\n"); - return -EINVAL; - } - - /* the bitmask is from 1..124, not from 0..123 */ - arfcn--; - - byte = arfcn / 8; - bit = arfcn % 8; - - chan_list[GSM48_CELL_CHAN_DESC_SIZE-1-byte] |= (1 << bit); - - return 0; -} - -/* 10.5.2.13.7: Variable bit map format */ -static int freq_list_bmrel_set_arfcn(uint8_t *chan_list, unsigned int arfcn) -{ - unsigned int byte, bit; - unsigned int min_arfcn; - unsigned int bitno; - - min_arfcn = (chan_list[0] & 1) << 9; - min_arfcn |= chan_list[1] << 1; - min_arfcn |= (chan_list[2] >> 7) & 1; - - /* The lower end of our bitmaks is always implicitly included */ - if (arfcn == min_arfcn) - return 0; - - if (((arfcn - min_arfcn) & 1023) > 111) { - LOGP(DRR, LOGL_ERROR, "arfcn(%u) > min(%u) + 111\n", arfcn, min_arfcn); - return -EINVAL; - } - - bitno = (arfcn - min_arfcn) & 1023; - byte = bitno / 8; - bit = bitno % 8; - - chan_list[2 + byte] |= 1 << (7 - bit); - - return 0; -} - -/* generate a variable bitmap */ -static inline int enc_freq_lst_var_bitmap(uint8_t *chan_list, - struct bitvec *bv, const struct gsm_bts *bts, - bool bis, bool ter, int min, bool pgsm) -{ - int i; - - /* set it to 'Variable bitmap format' */ - chan_list[0] = 0x8e; - - chan_list[0] |= (min >> 9) & 1; - chan_list[1] = (min >> 1); - chan_list[2] = (min & 1) << 7; - - for (i = 0; i < bv->data_len*8; i++) { - /* see notes in bitvec2freq_list */ - if (bitvec_get_bit_pos(bv, i) - && ((!bis && !ter && band_compatible(bts,i)) - || (bis && pgsm && band_compatible(bts,i) && (i < 1 || i > 124)) - || (ter && !band_compatible(bts, i)))) { - int rc = freq_list_bmrel_set_arfcn(chan_list, i); - if (rc < 0) - return rc; - } - } - - return 0; -} - -int range_encode(enum gsm48_range r, int *arfcns, int arfcns_used, int *w, - int f0, uint8_t *chan_list) -{ - /* - * Manipulate the ARFCN list according to the rules in J4 depending - * on the selected range. - */ - int rc, f0_included; - - range_enc_filter_arfcns(arfcns, arfcns_used, f0, &f0_included); - - rc = range_enc_arfcns(r, arfcns, arfcns_used, w, 0); - if (rc < 0) - return rc; - - /* Select the range and the amount of bits needed */ - switch (r) { - case ARFCN_RANGE_128: - return range_enc_range128(chan_list, f0, w); - case ARFCN_RANGE_256: - return range_enc_range256(chan_list, f0, w); - case ARFCN_RANGE_512: - return range_enc_range512(chan_list, f0, w); - case ARFCN_RANGE_1024: - return range_enc_range1024(chan_list, f0, f0_included, w); - default: - return -ERANGE; - }; - - return f0_included; -} - -/* generate a frequency list with the range 512 format */ -static inline int enc_freq_lst_range(uint8_t *chan_list, - struct bitvec *bv, const struct gsm_bts *bts, - bool bis, bool ter, bool pgsm) -{ - int arfcns[RANGE_ENC_MAX_ARFCNS]; - int w[RANGE_ENC_MAX_ARFCNS]; - int arfcns_used = 0; - int i, range, f0; - - /* - * Select ARFCNs according to the rules in bitvec2freq_list - */ - for (i = 0; i < bv->data_len * 8; ++i) { - /* More ARFCNs than the maximum */ - if (arfcns_used > ARRAY_SIZE(arfcns)) - return -1; - /* Check if we can select it? */ - if (bitvec_get_bit_pos(bv, i) && use_arfcn(bts, bis, ter, pgsm, i)) - arfcns[arfcns_used++] = i; - } - - /* - * Check if the given list of ARFCNs can be encoded. - */ - range = range_enc_determine_range(arfcns, arfcns_used, &f0); - if (range == ARFCN_RANGE_INVALID) - return -2; - - memset(w, 0, sizeof(w)); - return range_encode(range, arfcns, arfcns_used, w, f0, chan_list); -} - -/* generate a cell channel list as per Section 10.5.2.1b of 04.08 */ -static int bitvec2freq_list(uint8_t *chan_list, struct bitvec *bv, - const struct gsm_bts *bts, bool bis, bool ter) -{ - int i, rc, min = -1, max = -1, arfcns = 0; - bool pgsm = false; - memset(chan_list, 0, 16); - - if (bts->band == GSM_BAND_900 - && bts->c0->arfcn >= 1 && bts->c0->arfcn <= 124) - pgsm = true; - /* P-GSM-only handsets only support 'bit map 0 format' */ - if (!bis && !ter && pgsm) { - chan_list[0] = 0; - - for (i = 0; i < bv->data_len*8; i++) { - if (i >= 1 && i <= 124 - && bitvec_get_bit_pos(bv, i)) { - rc = freq_list_bm0_set_arfcn(chan_list, i); - if (rc < 0) - return rc; - } - } - return 0; - } - - for (i = 0; i < bv->data_len*8; i++) { - /* in case of SI2 or SI5 allow all neighbours in same band - * in case of SI*bis, allow neighbours in same band ouside pgsm - * in case of SI*ter, allow neighbours in different bands - */ - if (!bitvec_get_bit_pos(bv, i)) - continue; - if (!use_arfcn(bts, bis, ter, pgsm, i)) - continue; - /* count the arfcns we want to carry */ - arfcns += 1; - - /* 955..1023 < 0..885 */ - if (min < 0) - min = i; - if (i >= 955 && min < 955) - min = i; - if (i >= 955 && min >= 955 && i < min) - min = i; - if (i < 955 && min < 955 && i < min) - min = i; - if (max < 0) - max = i; - if (i < 955 && max >= 955) - max = i; - if (i >= 955 && max >= 955 && i > max) - max = i; - if (i < 955 && max < 955 && i > max) - max = i; - } - - if (max == -1) { - /* Empty set, use 'bit map 0 format' */ - chan_list[0] = 0; - return 0; - } - - /* Now find the best encoding */ - if (((max - min) & 1023) <= 111) - return enc_freq_lst_var_bitmap(chan_list, bv, bts, bis, - ter, min, pgsm); - - /* Attempt to do the range encoding */ - rc = enc_freq_lst_range(chan_list, bv, bts, bis, ter, pgsm); - if (rc >= 0) - return 0; - - LOGP(DRR, LOGL_ERROR, "min_arfcn=%u, max_arfcn=%u, arfcns=%d " - "can not generate ARFCN list", min, max, arfcns); - return -EINVAL; -} - -/* generate a cell channel list as per Section 10.5.2.1b of 04.08 */ -/* static*/ int generate_cell_chan_list(uint8_t *chan_list, struct gsm_bts *bts) -{ - struct gsm_bts_trx *trx; - struct bitvec *bv = &bts->si_common.cell_alloc; - - /* Zero-initialize the bit-vector */ - memset(bv->data, 0, bv->data_len); - - /* first we generate a bitvec of all TRX ARFCN's in our BTS */ - llist_for_each_entry(trx, &bts->trx_list, list) { - unsigned int i, j; - /* Always add the TRX's ARFCN */ - bitvec_set_bit_pos(bv, trx->arfcn, 1); - for (i = 0; i < ARRAY_SIZE(trx->ts); i++) { - struct gsm_bts_trx_ts *ts = &trx->ts[i]; - /* Add any ARFCNs present in hopping channels */ - for (j = 0; j < 1024; j++) { - if (bitvec_get_bit_pos(&ts->hopping.arfcns, j)) - bitvec_set_bit_pos(bv, j, 1); - } - } - } - - /* then we generate a GSM 04.08 frequency list from the bitvec */ - return bitvec2freq_list(chan_list, bv, bts, false, false); -} - -/* generate a cell channel list as per Section 10.5.2.1b of 04.08 */ -static int generate_bcch_chan_list(uint8_t *chan_list, struct gsm_bts *bts, - bool si5, bool bis, bool ter) -{ - struct gsm_bts *cur_bts; - struct bitvec *bv; - - if (si5 && bts->neigh_list_manual_mode == NL_MODE_MANUAL_SI5SEP) - bv = &bts->si_common.si5_neigh_list; - else - bv = &bts->si_common.neigh_list; - - /* Generate list of neighbor cells if we are in automatic mode */ - if (bts->neigh_list_manual_mode == NL_MODE_AUTOMATIC) { - /* Zero-initialize the bit-vector */ - memset(bv->data, 0, bv->data_len); - - /* first we generate a bitvec of the BCCH ARFCN's in our BSC */ - llist_for_each_entry(cur_bts, &bts->network->bts_list, list) { - if (cur_bts == bts) - continue; - bitvec_set_bit_pos(bv, cur_bts->c0->arfcn, 1); - } - } - - /* then we generate a GSM 04.08 frequency list from the bitvec */ - return bitvec2freq_list(chan_list, bv, bts, bis, ter); -} - -static int list_arfcn(uint8_t *chan_list, uint8_t mask, char *text) -{ - int n = 0, i; - struct gsm_sysinfo_freq freq[1024]; - - memset(freq, 0, sizeof(freq)); - gsm48_decode_freq_list(freq, chan_list, 16, 0xce, 1); - for (i = 0; i < 1024; i++) { - if (freq[i].mask) { - if (!n) - LOGP(DRR, LOGL_INFO, "%s", text); - LOGPC(DRR, LOGL_INFO, " %d", i); - n++; - } - } - if (n) - LOGPC(DRR, LOGL_INFO, "\n"); - - return n; -} - -static int generate_si1(enum osmo_sysinfo_type t, struct gsm_bts *bts) -{ - int rc; - struct gsm48_system_information_type_1 *si1 = (struct gsm48_system_information_type_1 *) GSM_BTS_SI(bts, t); - - memset(si1, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); - - si1->header.l2_plen = GSM48_LEN2PLEN(21); - si1->header.rr_protocol_discriminator = GSM48_PDISC_RR; - si1->header.skip_indicator = 0; - si1->header.system_information = GSM48_MT_RR_SYSINFO_1; - - rc = generate_cell_chan_list(si1->cell_channel_description, bts); - if (rc < 0) - return rc; - list_arfcn(si1->cell_channel_description, 0xce, "Serving cell:"); - - si1->rach_control = bts->si_common.rach_control; - - /* - * SI1 Rest Octets (10.5.2.32), contains NCH position and band - * indicator but that is not in the 04.08. - */ - rc = rest_octets_si1(si1->rest_octets, NULL, is_dcs_net(bts)); - - return sizeof(*si1) + rc; -} - -static int generate_si2(enum osmo_sysinfo_type t, struct gsm_bts *bts) -{ - int rc; - struct gsm48_system_information_type_2 *si2 = (struct gsm48_system_information_type_2 *) GSM_BTS_SI(bts, t); - - memset(si2, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); - - si2->header.l2_plen = GSM48_LEN2PLEN(22); - si2->header.rr_protocol_discriminator = GSM48_PDISC_RR; - si2->header.skip_indicator = 0; - si2->header.system_information = GSM48_MT_RR_SYSINFO_2; - - rc = generate_bcch_chan_list(si2->bcch_frequency_list, bts, false, false, false); - if (rc < 0) - return rc; - list_arfcn(si2->bcch_frequency_list, 0xce, - "SI2 Neighbour cells in same band:"); - - si2->ncc_permitted = bts->si_common.ncc_permitted; - si2->rach_control = bts->si_common.rach_control; - - return sizeof(*si2); -} - -static int generate_si2bis(enum osmo_sysinfo_type t, struct gsm_bts *bts) -{ - int rc; - struct gsm48_system_information_type_2bis *si2b = - (struct gsm48_system_information_type_2bis *) GSM_BTS_SI(bts, t); - int n; - - memset(si2b, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); - - si2b->header.l2_plen = GSM48_LEN2PLEN(22); - si2b->header.rr_protocol_discriminator = GSM48_PDISC_RR; - si2b->header.skip_indicator = 0; - si2b->header.system_information = GSM48_MT_RR_SYSINFO_2bis; - - rc = generate_bcch_chan_list(si2b->bcch_frequency_list, bts, false, true, false); - if (rc < 0) - return rc; - n = list_arfcn(si2b->bcch_frequency_list, 0xce, - "Neighbour cells in same band, but outside P-GSM:"); - if (n) { - /* indicate in SI2 and SI2bis: there is an extension */ - struct gsm48_system_information_type_2 *si2 = - (struct gsm48_system_information_type_2 *) GSM_BTS_SI(bts, SYSINFO_TYPE_2); - si2->bcch_frequency_list[0] |= 0x20; - si2b->bcch_frequency_list[0] |= 0x20; - } else - bts->si_valid &= ~(1 << SYSINFO_TYPE_2bis); - - si2b->rach_control = bts->si_common.rach_control; - - return sizeof(*si2b); -} - -static int generate_si2ter(enum osmo_sysinfo_type t, struct gsm_bts *bts) -{ - int rc; - struct gsm48_system_information_type_2ter *si2t = - (struct gsm48_system_information_type_2ter *) GSM_BTS_SI(bts, t); - int n; - - memset(si2t, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); - - si2t->header.l2_plen = GSM48_LEN2PLEN(22); - si2t->header.rr_protocol_discriminator = GSM48_PDISC_RR; - si2t->header.skip_indicator = 0; - si2t->header.system_information = GSM48_MT_RR_SYSINFO_2ter; - - rc = generate_bcch_chan_list(si2t->ext_bcch_frequency_list, bts, false, false, true); - if (rc < 0) - return rc; - n = list_arfcn(si2t->ext_bcch_frequency_list, 0x8e, - "Neighbour cells in different band:"); - if (!n) - bts->si_valid &= ~(1 << SYSINFO_TYPE_2ter); - - return sizeof(*si2t); -} - -/* SI2quater messages are optional - we only generate them when neighbor UARFCNs or EARFCNs are configured */ -static inline bool si2quater_not_needed(struct gsm_bts *bts) -{ - unsigned i = MAX_EARFCN_LIST; - - if (bts->si_common.si2quater_neigh_list.arfcn) - for (i = 0; i < MAX_EARFCN_LIST; i++) - if (bts->si_common.si2quater_neigh_list.arfcn[i] != OSMO_EARFCN_INVALID) - break; - - if (!bts->si_common.uarfcn_length && i == MAX_EARFCN_LIST) { - bts->si_valid &= ~(1 << SYSINFO_TYPE_2quater); /* mark SI2q as invalid if no (E|U)ARFCNs are present */ - return true; - } - - return false; -} - -static int generate_si2quater(enum osmo_sysinfo_type t, struct gsm_bts *bts) -{ - int rc; - struct gsm48_system_information_type_2quater *si2q; - - if (si2quater_not_needed(bts)) /* generate rest_octets for SI2q only when necessary */ - return GSM_MACBLOCK_LEN; - - bts->u_offset = 0; - bts->e_offset = 0; - bts->si2q_index = 0; - bts->si2q_count = si2q_num(bts) - 1; - - rc = make_si2quaters(bts, false); - if (rc < 0) - return rc; - - OSMO_ASSERT(bts->si2q_count == bts->si2q_index); - OSMO_ASSERT(bts->si2q_count <= SI2Q_MAX_NUM); - - return sizeof(*si2q) + rc; -} - -static struct gsm48_si_ro_info si_info = { - .selection_params = { - .present = 0, - }, - .power_offset = { - .present = 0, - }, - .si2ter_indicator = 0, - .early_cm_ctrl = 1, - .scheduling = { - .present = 0, - }, - .gprs_ind = { - .si13_position = 0, - .ra_colour = 0, - .present = 1, - }, - .si2quater_indicator = 0, - .lsa_params = { - .present = 0, - }, - .cell_id = 0, /* FIXME: doesn't the bts have this? */ - .break_ind = 0, -}; - -static int generate_si3(enum osmo_sysinfo_type t, struct gsm_bts *bts) -{ - int rc; - struct gsm48_system_information_type_3 *si3 = (struct gsm48_system_information_type_3 *) GSM_BTS_SI(bts, t); - - memset(si3, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); - - si3->header.l2_plen = GSM48_LEN2PLEN(18); - si3->header.rr_protocol_discriminator = GSM48_PDISC_RR; - si3->header.skip_indicator = 0; - si3->header.system_information = GSM48_MT_RR_SYSINFO_3; - - si3->cell_identity = htons(bts->cell_identity); - gsm48_generate_lai(&si3->lai, bts->network->country_code, - bts->network->network_code, - bts->location_area_code); - si3->control_channel_desc = bts->si_common.chan_desc; - si3->cell_options = bts->si_common.cell_options; - si3->cell_sel_par = bts->si_common.cell_sel_par; - si3->rach_control = bts->si_common.rach_control; - - /* allow/disallow DTXu */ - gsm48_set_dtx(&si3->cell_options, bts->dtxu, bts->dtxu, true); - - if (GSM_BTS_HAS_SI(bts, SYSINFO_TYPE_2ter)) { - LOGP(DRR, LOGL_INFO, "SI 2ter is included.\n"); - si_info.si2ter_indicator = 1; - } else { - si_info.si2ter_indicator = 0; - } - if (GSM_BTS_HAS_SI(bts, SYSINFO_TYPE_2quater)) { - LOGP(DRR, LOGL_INFO, "SI 2quater is included, based on %zu EARFCNs and %zu UARFCNs.\n", - si2q_earfcn_count(&bts->si_common.si2quater_neigh_list), bts->si_common.uarfcn_length); - si_info.si2quater_indicator = 1; - } else { - si_info.si2quater_indicator = 0; - } - si_info.early_cm_ctrl = bts->early_classmark_allowed; - - /* SI3 Rest Octets (10.5.2.34), containing - CBQ, CELL_RESELECT_OFFSET, TEMPORARY_OFFSET, PENALTY_TIME - Power Offset, 2ter Indicator, Early Classmark Sending, - Scheduling if and WHERE, GPRS Indicator, SI13 position */ - rc = rest_octets_si3(si3->rest_octets, &si_info); - - return sizeof(*si3) + rc; -} - -static int generate_si4(enum osmo_sysinfo_type t, struct gsm_bts *bts) -{ - int rc; - struct gsm48_system_information_type_4 *si4 = (struct gsm48_system_information_type_4 *) GSM_BTS_SI(bts, t); - struct gsm_lchan *cbch_lchan; - uint8_t *restoct = si4->data; - - /* length of all IEs present except SI4 rest octets and l2_plen */ - int l2_plen = sizeof(*si4) - 1; - - memset(si4, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); - - si4->header.rr_protocol_discriminator = GSM48_PDISC_RR; - si4->header.skip_indicator = 0; - si4->header.system_information = GSM48_MT_RR_SYSINFO_4; - - gsm48_generate_lai(&si4->lai, bts->network->country_code, - bts->network->network_code, - bts->location_area_code); - si4->cell_sel_par = bts->si_common.cell_sel_par; - si4->rach_control = bts->si_common.rach_control; - - /* Optional: CBCH Channel Description + CBCH Mobile Allocation */ - cbch_lchan = gsm_bts_get_cbch(bts); - if (cbch_lchan) { - struct gsm48_chan_desc cd; - gsm48_lchan2chan_desc(&cd, cbch_lchan); - tv_fixed_put(si4->data, GSM48_IE_CBCH_CHAN_DESC, 3, - (uint8_t *) &cd); - l2_plen += 3 + 1; - restoct += 3 + 1; - /* we don't use hopping and thus don't need a CBCH MA */ - } - - si4->header.l2_plen = GSM48_LEN2PLEN(l2_plen); - - /* SI4 Rest Octets (10.5.2.35), containing - Optional Power offset, GPRS Indicator, - Cell Identity, LSA ID, Selection Parameter */ - rc = rest_octets_si4(restoct, &si_info, (uint8_t *)GSM_BTS_SI(bts, t) + GSM_MACBLOCK_LEN - restoct); - - return l2_plen + 1 + rc; -} - -static int generate_si5(enum osmo_sysinfo_type t, struct gsm_bts *bts) -{ - struct gsm48_system_information_type_5 *si5; - uint8_t *output = GSM_BTS_SI(bts, t); - int rc, l2_plen = 18; - - memset(output, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); - - /* ip.access nanoBTS needs l2_plen!! */ - switch (bts->type) { - case GSM_BTS_TYPE_NANOBTS: - case GSM_BTS_TYPE_OSMOBTS: - *output++ = GSM48_LEN2PLEN(l2_plen); - l2_plen++; - break; - default: - break; - } - - si5 = (struct gsm48_system_information_type_5 *) GSM_BTS_SI(bts, t); - - /* l2 pseudo length, not part of msg: 18 */ - si5->rr_protocol_discriminator = GSM48_PDISC_RR; - si5->skip_indicator = 0; - si5->system_information = GSM48_MT_RR_SYSINFO_5; - rc = generate_bcch_chan_list(si5->bcch_frequency_list, bts, true, false, false); - if (rc < 0) - return rc; - list_arfcn(si5->bcch_frequency_list, 0xce, - "SI5 Neighbour cells in same band:"); - - /* 04.08 9.1.37: L2 Pseudo Length of 18 */ - return l2_plen; -} - -static int generate_si5bis(enum osmo_sysinfo_type t, struct gsm_bts *bts) -{ - struct gsm48_system_information_type_5bis *si5b; - uint8_t *output = GSM_BTS_SI(bts, t); - int rc, l2_plen = 18; - int n; - - memset(output, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); - - /* ip.access nanoBTS needs l2_plen!! */ - switch (bts->type) { - case GSM_BTS_TYPE_NANOBTS: - case GSM_BTS_TYPE_OSMOBTS: - *output++ = GSM48_LEN2PLEN(l2_plen); - l2_plen++; - break; - default: - break; - } - - si5b = (struct gsm48_system_information_type_5bis *) GSM_BTS_SI(bts, t); - - /* l2 pseudo length, not part of msg: 18 */ - si5b->rr_protocol_discriminator = GSM48_PDISC_RR; - si5b->skip_indicator = 0; - si5b->system_information = GSM48_MT_RR_SYSINFO_5bis; - rc = generate_bcch_chan_list(si5b->bcch_frequency_list, bts, true, true, false); - if (rc < 0) - return rc; - n = list_arfcn(si5b->bcch_frequency_list, 0xce, - "Neighbour cells in same band, but outside P-GSM:"); - if (n) { - /* indicate in SI5 and SI5bis: there is an extension */ - struct gsm48_system_information_type_5 *si5 = - (struct gsm48_system_information_type_5 *) GSM_BTS_SI(bts, SYSINFO_TYPE_5); - si5->bcch_frequency_list[0] |= 0x20; - si5b->bcch_frequency_list[0] |= 0x20; - } else - bts->si_valid &= ~(1 << SYSINFO_TYPE_5bis); - - /* 04.08 9.1.37: L2 Pseudo Length of 18 */ - return l2_plen; -} - -static int generate_si5ter(enum osmo_sysinfo_type t, struct gsm_bts *bts) -{ - struct gsm48_system_information_type_5ter *si5t; - uint8_t *output = GSM_BTS_SI(bts, t); - int rc, l2_plen = 18; - int n; - - memset(output, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); - - /* ip.access nanoBTS needs l2_plen!! */ - switch (bts->type) { - case GSM_BTS_TYPE_NANOBTS: - case GSM_BTS_TYPE_OSMOBTS: - *output++ = GSM48_LEN2PLEN(l2_plen); - l2_plen++; - break; - default: - break; - } - - si5t = (struct gsm48_system_information_type_5ter *) GSM_BTS_SI(bts, t); - - /* l2 pseudo length, not part of msg: 18 */ - si5t->rr_protocol_discriminator = GSM48_PDISC_RR; - si5t->skip_indicator = 0; - si5t->system_information = GSM48_MT_RR_SYSINFO_5ter; - rc = generate_bcch_chan_list(si5t->bcch_frequency_list, bts, true, false, true); - if (rc < 0) - return rc; - n = list_arfcn(si5t->bcch_frequency_list, 0x8e, - "Neighbour cells in different band:"); - if (!n) - bts->si_valid &= ~(1 << SYSINFO_TYPE_5ter); - - /* 04.08 9.1.37: L2 Pseudo Length of 18 */ - return l2_plen; -} - -static int generate_si6(enum osmo_sysinfo_type t, struct gsm_bts *bts) -{ - struct gsm48_system_information_type_6 *si6; - uint8_t *output = GSM_BTS_SI(bts, t); - int l2_plen = 11; - int rc; - - memset(output, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); - - /* ip.access nanoBTS needs l2_plen!! */ - switch (bts->type) { - case GSM_BTS_TYPE_NANOBTS: - case GSM_BTS_TYPE_OSMOBTS: - *output++ = GSM48_LEN2PLEN(l2_plen); - l2_plen++; - break; - default: - break; - } - - si6 = (struct gsm48_system_information_type_6 *) GSM_BTS_SI(bts, t); - - /* l2 pseudo length, not part of msg: 11 */ - si6->rr_protocol_discriminator = GSM48_PDISC_RR; - si6->skip_indicator = 0; - si6->system_information = GSM48_MT_RR_SYSINFO_6; - si6->cell_identity = htons(bts->cell_identity); - gsm48_generate_lai(&si6->lai, bts->network->country_code, - bts->network->network_code, - bts->location_area_code); - si6->cell_options = bts->si_common.cell_options; - si6->ncc_permitted = bts->si_common.ncc_permitted; - /* allow/disallow DTXu */ - gsm48_set_dtx(&si6->cell_options, bts->dtxu, bts->dtxu, false); - - /* SI6 Rest Octets: 10.5.2.35a: PCH / NCH info, VBS/VGCS options */ - rc = rest_octets_si6(si6->rest_octets, is_dcs_net(bts)); - - return l2_plen + rc; -} - -static struct gsm48_si13_info si13_default = { - .cell_opts = { - .nmo = GPRS_NMO_II, - .t3168 = 2000, - .t3192 = 1500, - .drx_timer_max = 3, - .bs_cv_max = 15, - .ctrl_ack_type_use_block = true, - .ext_info_present = 0, - .supports_egprs_11bit_rach = 0, - .ext_info = { - /* The values below are just guesses ! */ - .egprs_supported = 0, - .use_egprs_p_ch_req = 1, - .bep_period = 5, - .pfc_supported = 0, - .dtm_supported = 0, - .bss_paging_coordination = 0, - }, - }, - .pwr_ctrl_pars = { - .alpha = 0, /* a = 0.0 */ - .t_avg_w = 16, - .t_avg_t = 16, - .pc_meas_chan = 0, /* downling measured on CCCH */ - .n_avg_i = 8, - }, - .bcch_change_mark = 1, - .si_change_field = 0, - .pbcch_present = 0, - { - .no_pbcch = { - .rac = 0, /* needs to be patched */ - .spgc_ccch_sup = 0, - .net_ctrl_ord = 0, - .prio_acc_thr = 6, - }, - }, -}; - -static int generate_si13(enum osmo_sysinfo_type t, struct gsm_bts *bts) -{ - struct gsm48_system_information_type_13 *si13 = - (struct gsm48_system_information_type_13 *) GSM_BTS_SI(bts, t); - int ret; - - memset(si13, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); - - 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; - si13_default.no_pbcch.net_ctrl_ord = bts->gprs.net_ctrl_ord; - - si13_default.cell_opts.ctrl_ack_type_use_block = - bts->gprs.ctrl_ack_type_use_block; - - /* Information about the other SIs */ - si13_default.bcch_change_mark = bts->bcch_change_mark; - si13_default.cell_opts.supports_egprs_11bit_rach = - bts->gprs.supports_egprs_11bit_rach; - - 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; -} - -typedef int (*gen_si_fn_t)(enum osmo_sysinfo_type t, 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_2bis] = &generate_si2bis, - [SYSINFO_TYPE_2ter] = &generate_si2ter, - [SYSINFO_TYPE_2quater] = &generate_si2quater, - [SYSINFO_TYPE_3] = &generate_si3, - [SYSINFO_TYPE_4] = &generate_si4, - [SYSINFO_TYPE_5] = &generate_si5, - [SYSINFO_TYPE_5bis] = &generate_si5bis, - [SYSINFO_TYPE_5ter] = &generate_si5ter, - [SYSINFO_TYPE_6] = &generate_si6, - [SYSINFO_TYPE_13] = &generate_si13, -}; - -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(si_type, bts); -} |