| /* 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 q(m) 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; |
| } |
| } |
| |
| unsigned earfcn_size(const struct osmo_earfcn_si2q *e) |
| { |
| /* account for all the constant bits in append_earfcn() */ |
| return 25 + osmo_earfcn_bit_size(e); |
| } |
| |
| unsigned uarfcn_size(const uint16_t *u, const uint16_t *sc, size_t u_len) |
| { |
| /*account for all the constant bits in append_uarfcn() */ |
| return 29 + range1024_p(u_len); |
| } |
| |
| /* 3GPP TS 44.018, Table 9.1.54.1 - prepend diversity bit to scrambling code */ |
| uint16_t encode_fdd(uint16_t scramble, bool diversity) |
| { |
| if (diversity) |
| return scramble | (1 << 9); |
| return scramble; |
| } |
| |
| 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; |
| 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, 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++; |
| return 0; |
| } |
| |
| 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; |
| } |
| |
| /* 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 f0_included = 0; |
| int arfcns_used = 0; |
| int i, rc, 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; |
| |
| /* |
| * Manipulate the ARFCN list according to the rules in J4 depending |
| * on the selected range. |
| */ |
| arfcns_used = range_enc_filter_arfcns(arfcns, arfcns_used, |
| f0, &f0_included); |
| |
| memset(w, 0, sizeof(w)); |
| rc = range_enc_arfcns(range, arfcns, arfcns_used, w, 0); |
| if (rc != 0) |
| return -3; |
| |
| /* Select the range and the amount of bits needed */ |
| switch (range) { |
| case ARFCN_RANGE_128: |
| return range_enc_range128(chan_list, f0, w); |
| break; |
| case ARFCN_RANGE_256: |
| return range_enc_range256(chan_list, f0, w); |
| break; |
| case ARFCN_RANGE_512: |
| return range_enc_range512(chan_list, f0, w); |
| break; |
| case ARFCN_RANGE_1024: |
| return range_enc_range1024(chan_list, f0, f0_included, w); |
| break; |
| default: |
| return -4; |
| }; |
| } |
| |
| /* 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(uint8_t *output, struct gsm_bts *bts) |
| { |
| int rc; |
| struct gsm48_system_information_type_1 *si1 = |
| (struct gsm48_system_information_type_1 *) output; |
| |
| memset(si1, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); |
| |
| si1->header.l2_plen = (21 << 2) | 1; |
| 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(uint8_t *output, struct gsm_bts *bts) |
| { |
| int rc; |
| struct gsm48_system_information_type_2 *si2 = |
| (struct gsm48_system_information_type_2 *) output; |
| |
| memset(si2, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); |
| |
| si2->header.l2_plen = (22 << 2) | 1; |
| 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(uint8_t *output, struct gsm_bts *bts) |
| { |
| int rc; |
| struct gsm48_system_information_type_2bis *si2b = |
| (struct gsm48_system_information_type_2bis *) output; |
| int n; |
| |
| memset(si2b, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); |
| |
| si2b->header.l2_plen = (22 << 2) | 1; |
| 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 *) |
| bts->si_buf[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(uint8_t *output, struct gsm_bts *bts) |
| { |
| int rc; |
| struct gsm48_system_information_type_2ter *si2t = |
| (struct gsm48_system_information_type_2ter *) output; |
| int n; |
| |
| memset(si2t, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); |
| |
| si2t->header.l2_plen = (22 << 2) | 1; |
| 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); |
| } |
| |
| static int generate_si2quater(uint8_t *output, struct gsm_bts *bts) |
| { |
| int rc; |
| struct gsm48_system_information_type_2quater *si2q = |
| (struct gsm48_system_information_type_2quater *) output; |
| |
| 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->si_common.si2quater_neigh_list, |
| bts->si_common.data.uarfcn_list, |
| bts->si_common.data.scramble_list, |
| bts->si_common.uarfcn_length); |
| if (rc < 0) |
| return rc; |
| |
| 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(uint8_t *output, struct gsm_bts *bts) |
| { |
| int rc; |
| struct gsm48_system_information_type_3 *si3 = |
| (struct gsm48_system_information_type_3 *) output; |
| |
| memset(si3, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN); |
| |
| si3->header.l2_plen = (18 << 2) | 1; |
| 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; |
| |
| if ((bts->si_valid & (1 << SYSINFO_TYPE_2ter))) { |
| LOGP(DRR, LOGL_INFO, "SI 2ter is included.\n"); |
| si_info.si2ter_indicator = 1; |
| } else { |
| si_info.si2ter_indicator = 0; |
| } |
| if ((bts->si_valid & (1 << SYSINFO_TYPE_2quater))) { |
| LOGP(DRR, LOGL_INFO, "SI 2quater is included.\n"); |
| si_info.si2quater_indicator = 1; |
| } else { |
| si_info.si2quater_indicator = 0; |
| } |
| /* 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(uint8_t *output, struct gsm_bts *bts) |
| { |
| int rc; |
| struct gsm48_system_information_type_4 *si4 = |
| (struct gsm48_system_information_type_4 *) output; |
| 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 = (l2_plen << 2) | 1; |
| |
| /* 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, output + GSM_MACBLOCK_LEN - restoct); |
| |
| return l2_plen + 1 + rc; |
| } |
| |
| static int generate_si5(uint8_t *output, struct gsm_bts *bts) |
| { |
| struct gsm48_system_information_type_5 *si5; |
| 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_OSMO_SYSMO: |
| *output++ = (l2_plen << 2) | 1; |
| l2_plen++; |
| break; |
| default: |
| break; |
| } |
| |
| si5 = (struct gsm48_system_information_type_5 *) output; |
| |
| /* 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(uint8_t *output, struct gsm_bts *bts) |
| { |
| struct gsm48_system_information_type_5bis *si5b; |
| 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_OSMO_SYSMO: |
| *output++ = (l2_plen << 2) | 1; |
| l2_plen++; |
| break; |
| default: |
| break; |
| } |
| |
| si5b = (struct gsm48_system_information_type_5bis *) output; |
| |
| /* 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 *) |
| bts->si_buf[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(uint8_t *output, struct gsm_bts *bts) |
| { |
| struct gsm48_system_information_type_5ter *si5t; |
| 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_OSMO_SYSMO: |
| *output++ = (l2_plen << 2) | 1; |
| l2_plen++; |
| break; |
| default: |
| break; |
| } |
| |
| si5t = (struct gsm48_system_information_type_5ter *) output; |
| |
| /* 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(uint8_t *output, struct gsm_bts *bts) |
| { |
| struct gsm48_system_information_type_6 *si6; |
| int l2_plen = 11; |
| |
| 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_OSMO_SYSMO: |
| *output++ = (l2_plen << 2) | 1; |
| l2_plen++; |
| break; |
| default: |
| break; |
| } |
| |
| si6 = (struct gsm48_system_information_type_6 *) output; |
| |
| /* 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; |
| |
| /* SI6 Rest Octets: 10.5.2.35a: PCH / NCH info, VBS/VGCS options */ |
| |
| return l2_plen; |
| } |
| |
| 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, |
| .ext_info_present = 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(uint8_t *output, struct gsm_bts *bts) |
| { |
| struct gsm48_system_information_type_13 *si13 = |
| (struct gsm48_system_information_type_13 *) output; |
| 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; |
| |
| /* Information about the other SIs */ |
| si13_default.bcch_change_mark = bts->bcch_change_mark; |
| |
| 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)(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_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(bts->si_buf[si_type], bts); |
| } |