| /* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface, |
| * rest octet handling according to |
| * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */ |
| |
| /* (C) 2009 by Harald Welte <laforge@gnumonks.org> |
| * |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| * |
| */ |
| |
| #include <string.h> |
| #include <stdlib.h> |
| #include <errno.h> |
| #include <stdbool.h> |
| |
| #include <osmocom/core/bitvec.h> |
| #include <osmocom/gsm/bitvec_gsm.h> |
| #include <osmocom/gsm/sysinfo.h> |
| #include <osmocom/gsm/gsm48_arfcn_range_encode.h> |
| #include <osmocom/gsm/gsm48_rest_octets.h> |
| |
| /* generate SI1 rest octets */ |
| int osmo_gsm48_rest_octets_si1_encode(uint8_t *data, uint8_t *nch_pos, int is1800_net) |
| { |
| struct bitvec bv; |
| |
| memset(&bv, 0, sizeof(bv)); |
| bv.data = data; |
| bv.data_len = 1; |
| |
| if (nch_pos) { |
| bitvec_set_bit(&bv, H); |
| bitvec_set_uint(&bv, *nch_pos, 5); |
| } else { |
| bitvec_set_bit(&bv, L); |
| } |
| |
| if (is1800_net) |
| bitvec_set_bit(&bv, L); |
| else |
| bitvec_set_bit(&bv, H); |
| |
| bitvec_spare_padding(&bv, 6); |
| return bv.data_len; |
| } |
| |
| /* Append Repeated E-UTRAN Neighbour Cell to bitvec: see 3GPP TS 44.018 Table 10.5.2.33b.1 */ |
| static inline bool append_eutran_neib_cell(struct bitvec *bv, const struct osmo_earfcn_si2q *e, size_t *e_offset, |
| uint8_t budget) |
| { |
| unsigned i, skip = 0; |
| int16_t rem = budget - 6; /* account for mandatory stop bit and THRESH_E-UTRAN_high */ |
| uint8_t earfcn_budget; |
| |
| if (budget <= 6) |
| return false; |
| |
| OSMO_ASSERT(budget <= SI2Q_MAX_LEN); |
| |
| /* first we have to properly adjust budget requirements */ |
| if (e->prio_valid) /* E-UTRAN_PRIORITY: 3GPP TS 45.008*/ |
| rem -= 4; |
| else |
| rem--; |
| |
| if (e->thresh_lo_valid) /* THRESH_E-UTRAN_low: */ |
| rem -= 6; |
| else |
| rem--; |
| |
| if (e->qrxlm_valid) /* E-UTRAN_QRXLEVMIN: */ |
| rem -= 6; |
| else |
| rem--; |
| |
| if (rem < 0) |
| return false; |
| |
| /* now we can proceed with actually adding EARFCNs within adjusted budget limit */ |
| for (i = 0; i < e->length; i++) { |
| if (e->arfcn[i] != OSMO_EARFCN_INVALID) { |
| if (skip < *e_offset) { |
| skip++; /* ignore EARFCNs added on previous calls */ |
| } else { |
| earfcn_budget = 17; /* compute budget per-EARFCN */ |
| if (OSMO_EARFCN_MEAS_INVALID == e->meas_bw[i]) |
| earfcn_budget++; |
| else |
| earfcn_budget += 4; |
| |
| if (rem - earfcn_budget < 0) |
| break; |
| else { |
| (*e_offset)++; |
| rem -= earfcn_budget; |
| |
| if (rem < 0) |
| return false; |
| |
| bitvec_set_bit(bv, 1); /* EARFCN: */ |
| bitvec_set_uint(bv, e->arfcn[i], 16); |
| |
| if (OSMO_EARFCN_MEAS_INVALID == e->meas_bw[i]) |
| bitvec_set_bit(bv, 0); |
| else { /* Measurement Bandwidth: 9.1.54 */ |
| bitvec_set_bit(bv, 1); |
| bitvec_set_uint(bv, e->meas_bw[i], 3); |
| } |
| } |
| } |
| } |
| } |
| |
| /* stop bit - end of EARFCN + Measurement Bandwidth sequence */ |
| bitvec_set_bit(bv, 0); |
| |
| /* Note: we don't support different EARFCN arrays each with different priority, threshold etc. */ |
| |
| if (e->prio_valid) { |
| /* E-UTRAN_PRIORITY: 3GPP TS 45.008*/ |
| bitvec_set_bit(bv, 1); |
| bitvec_set_uint(bv, e->prio, 3); |
| } else { |
| bitvec_set_bit(bv, 0); |
| } |
| |
| /* THRESH_E-UTRAN_high */ |
| bitvec_set_uint(bv, e->thresh_hi, 5); |
| |
| if (e->thresh_lo_valid) { |
| /* THRESH_E-UTRAN_low: */ |
| bitvec_set_bit(bv, 1); |
| bitvec_set_uint(bv, e->thresh_lo, 5); |
| } else { |
| bitvec_set_bit(bv, 0); |
| } |
| |
| if (e->qrxlm_valid) { |
| /* E-UTRAN_QRXLEVMIN: */ |
| bitvec_set_bit(bv, 1); |
| bitvec_set_uint(bv, e->qrxlm, 5); |
| } else { |
| bitvec_set_bit(bv, 0); |
| } |
| |
| return true; |
| } |
| |
| static inline void append_earfcn(struct bitvec *bv, const struct osmo_earfcn_si2q *e, size_t *e_offset, uint8_t budget) |
| { |
| bool appended; |
| unsigned int old = bv->cur_bit; /* save current position to make rollback possible */ |
| int rem = budget - 25; |
| if (rem <= 0) |
| return; |
| |
| OSMO_ASSERT(budget <= SI2Q_MAX_LEN); |
| |
| /* Additions in Rel-5: */ |
| bitvec_set_bit(bv, H); |
| /* No 3G Additional Measurement Param. Descr. */ |
| bitvec_set_bit(bv, 0); |
| /* No 3G ADDITIONAL MEASUREMENT Param. Descr. 2 */ |
| bitvec_set_bit(bv, 0); |
| /* Additions in Rel-6: */ |
| bitvec_set_bit(bv, H); |
| /* 3G_CCN_ACTIVE */ |
| bitvec_set_bit(bv, 0); |
| /* Additions in Rel-7: */ |
| bitvec_set_bit(bv, H); |
| /* No 700_REPORTING_OFFSET */ |
| bitvec_set_bit(bv, 0); |
| /* No 810_REPORTING_OFFSET */ |
| bitvec_set_bit(bv, 0); |
| /* Additions in Rel-8: */ |
| bitvec_set_bit(bv, H); |
| |
| /* Priority and E-UTRAN Parameters Description */ |
| bitvec_set_bit(bv, 1); |
| |
| /* No Serving Cell Priority Parameters Descr. */ |
| bitvec_set_bit(bv, 0); |
| /* No 3G Priority Parameters Description */ |
| bitvec_set_bit(bv, 0); |
| /* E-UTRAN Parameters Description */ |
| bitvec_set_bit(bv, 1); |
| |
| /* E-UTRAN_CCN_ACTIVE */ |
| bitvec_set_bit(bv, 0); |
| /* E-UTRAN_Start: 9.1.54 */ |
| bitvec_set_bit(bv, 1); |
| /* E-UTRAN_Stop: 9.1.54 */ |
| bitvec_set_bit(bv, 1); |
| |
| /* No E-UTRAN Measurement Parameters Descr. */ |
| bitvec_set_bit(bv, 0); |
| /* No GPRS E-UTRAN Measurement Param. Descr. */ |
| bitvec_set_bit(bv, 0); |
| |
| /* Note: each of next 3 "repeated" structures might be repeated any |
| (0, 1, 2...) times - we only support 1 and 0 */ |
| |
| /* Repeated E-UTRAN Neighbour Cells */ |
| bitvec_set_bit(bv, 1); |
| |
| appended = append_eutran_neib_cell(bv, e, e_offset, rem); |
| if (!appended) { /* appending is impossible within current budget: rollback */ |
| bv->cur_bit = old; |
| return; |
| } |
| |
| /* stop bit - end of Repeated E-UTRAN Neighbour Cells sequence: */ |
| bitvec_set_bit(bv, 0); |
| |
| /* Note: following 2 repeated structs are not supported ATM */ |
| /* stop bit - end of Repeated E-UTRAN Not Allowed Cells sequence: */ |
| bitvec_set_bit(bv, 0); |
| /* stop bit - end of Repeated E-UTRAN PCID to TA mapping sequence: */ |
| bitvec_set_bit(bv, 0); |
| |
| /* Priority and E-UTRAN Parameters Description ends here */ |
| /* No 3G CSG Description */ |
| bitvec_set_bit(bv, 0); |
| /* No E-UTRAN CSG Description */ |
| bitvec_set_bit(bv, 0); |
| /* No Additions in Rel-9: */ |
| bitvec_set_bit(bv, L); |
| } |
| |
| static int range_encode(enum osmo_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; |
| |
| osmo_gsm48_range_enc_filter_arfcns(arfcns, arfcns_used, f0, &f0_included); |
| |
| rc = osmo_gsm48_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 OSMO_GSM48_ARFCN_RANGE_128: |
| return osmo_gsm48_range_enc_128(chan_list, f0, w); |
| case OSMO_GSM48_ARFCN_RANGE_256: |
| return osmo_gsm48_range_enc_256(chan_list, f0, w); |
| case OSMO_GSM48_ARFCN_RANGE_512: |
| return osmo_gsm48_range_enc_512(chan_list, f0, w); |
| case OSMO_GSM48_ARFCN_RANGE_1024: |
| return osmo_gsm48_range_enc_1024(chan_list, f0, f0_included, w); |
| default: |
| return -ERANGE; |
| }; |
| |
| return f0_included; |
| } |
| |
| static inline int f0_helper(int *sc, size_t length, uint8_t *chan_list) |
| { |
| int w[OSMO_GSM48_RANGE_ENC_MAX_ARFCNS] = { 0 }; |
| |
| return range_encode(OSMO_GSM48_ARFCN_RANGE_1024, sc, length, w, 0, chan_list); |
| } |
| |
| /* Return p(n) for given NR_OF_TDD_CELLS - see Table 9.1.54.1a, 3GPP TS 44.018 */ |
| static 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; |
| } |
| } |
| |
| /* Estimate how many bits it'll take to append single FDD UARFCN */ |
| static inline int append_utran_fdd_length(uint16_t u, const int *sc, size_t sc_len, size_t length) |
| { |
| uint8_t chan_list[16] = { 0 }; |
| int tmp[sc_len], f0; |
| |
| memcpy(tmp, sc, sizeof(tmp)); |
| |
| f0 = f0_helper(tmp, length, chan_list); |
| if (f0 < 0) |
| return f0; |
| |
| return 21 + range1024_p(length); |
| } |
| |
| /* Append single FDD UARFCN */ |
| static inline int append_utran_fdd(struct bitvec *bv, uint16_t u, int *sc, size_t length) |
| { |
| uint8_t chan_list[16] = { 0 }; |
| int f0 = f0_helper(sc, length, chan_list); |
| |
| if (f0 < 0) |
| return f0; |
| |
| /* Repeated UTRAN FDD Neighbour Cells */ |
| bitvec_set_bit(bv, 1); |
| |
| /* FDD-ARFCN */ |
| bitvec_set_bit(bv, 0); |
| bitvec_set_uint(bv, u, 14); |
| |
| /* FDD_Indic0: parameter value '0000000000' is a member of the set? */ |
| bitvec_set_bit(bv, f0); |
| /* NR_OF_FDD_CELLS */ |
| bitvec_set_uint(bv, length, 5); |
| |
| f0 = bv->cur_bit; |
| bitvec_add_range1024(bv, (struct gsm48_range_1024 *)chan_list); |
| bv->cur_bit = f0 + range1024_p(length); |
| |
| return 21 + range1024_p(length); |
| } |
| |
| static inline int try_adding_uarfcn(struct bitvec *bv, uint16_t *scramble_list, |
| size_t uarfcn_length, size_t *u_offset, |
| uint16_t uarfcn, uint8_t num_sc, uint8_t start_pos, uint8_t budget) |
| { |
| int i, k, rc, a[uarfcn_length]; |
| |
| if (budget < 23) |
| return -ENOMEM; |
| |
| /* copy corresponding Scrambling Codes: range encoder make in-place modifications */ |
| for (i = start_pos, k = 0; i < num_sc; a[k++] = scramble_list[i++]); |
| |
| /* estimate bit length requirements */ |
| rc = append_utran_fdd_length(uarfcn, a, uarfcn_length, k); |
| if (rc < 0) |
| return rc; /* range encoder failure */ |
| |
| if (budget - rc <= 0) |
| return -ENOMEM; /* we have ran out of budget in current SI2q */ |
| |
| /* compute next offset */ |
| *u_offset += k; |
| |
| return budget - append_utran_fdd(bv, uarfcn, a, k); |
| } |
| |
| /* Append multiple FDD UARFCNs */ |
| static inline void append_uarfcns(struct bitvec *bv, const uint16_t *uarfcn_list, size_t *u_offset, |
| size_t uarfcn_length, uint16_t *scramble_list, uint8_t budget) |
| { |
| int i, rem = budget - 7, st = *u_offset; /* account for constant bits right away */ |
| uint16_t cu = uarfcn_list[*u_offset]; /* caller ensures that length is positive */ |
| |
| OSMO_ASSERT(budget <= SI2Q_MAX_LEN); |
| |
| if (budget <= 7) |
| return; |
| |
| /* 3G Neighbour Cell Description */ |
| bitvec_set_bit(bv, 1); |
| /* No Index_Start_3G */ |
| bitvec_set_bit(bv, 0); |
| /* No Absolute_Index_Start_EMR */ |
| bitvec_set_bit(bv, 0); |
| |
| /* UTRAN FDD Description */ |
| bitvec_set_bit(bv, 1); |
| /* No Bandwidth_FDD */ |
| bitvec_set_bit(bv, 0); |
| |
| for (i = *u_offset; i <= uarfcn_length; i++) |
| if (uarfcn_list[i] != cu) { /* we've reached new UARFCN */ |
| rem = try_adding_uarfcn(bv, scramble_list, uarfcn_length, u_offset, cu, i, st, rem); |
| if (rem < 0) |
| break; |
| |
| if (i < uarfcn_length) { |
| cu = uarfcn_list[i]; |
| st = i; |
| } else { |
| break; |
| } |
| } |
| |
| /* stop bit - end of Repeated UTRAN FDD Neighbour Cells */ |
| bitvec_set_bit(bv, 0); |
| |
| /* UTRAN TDD Description */ |
| bitvec_set_bit(bv, 0); |
| } |
| |
| static 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 rest octets: 3GPP TS 44.018 § 10.5.2.33b */ |
| int osmo_gsm48_rest_octets_si2quater_encode(uint8_t *data, uint8_t si2q_index, uint8_t si2q_count, |
| const uint16_t *uarfcn_list, size_t *u_offset, |
| size_t uarfcn_length, uint16_t *scramble_list, |
| struct osmo_earfcn_si2q *si2quater_neigh_list, |
| size_t *e_offset) |
| { |
| int rc; |
| struct bitvec bv; |
| |
| if (si2q_count < si2q_index) |
| return -EINVAL; |
| |
| bv.data = data; |
| bv.data_len = 20; |
| bitvec_zero(&bv); |
| |
| /* BA_IND: Set to '0' as that's what we use for SI2xxx type, |
| * whereas '1' is used for SI5xxx type messages. The point here |
| * is to be able to correlate whether a given MS measurement |
| * report was using the neighbor cells advertised in SI2 or in |
| * SI5, as those two could very well be different */ |
| bitvec_set_bit(&bv, 0); |
| /* 3G_BA_IND */ |
| bitvec_set_bit(&bv, 1); |
| /* MP_CHANGE_MARK */ |
| bitvec_set_bit(&bv, 0); |
| |
| /* SI2quater_INDEX */ |
| bitvec_set_uint(&bv, si2q_index, 4); |
| /* SI2quater_COUNT */ |
| bitvec_set_uint(&bv, si2q_count, 4); |
| |
| /* No Measurement_Parameters Description */ |
| bitvec_set_bit(&bv, 0); |
| /* No GPRS_Real Time Difference Description */ |
| bitvec_set_bit(&bv, 0); |
| /* No GPRS_BSIC Description */ |
| bitvec_set_bit(&bv, 0); |
| /* No GPRS_REPORT PRIORITY Description */ |
| bitvec_set_bit(&bv, 0); |
| /* No GPRS_MEASUREMENT_Parameters Description */ |
| bitvec_set_bit(&bv, 0); |
| /* No NC Measurement Parameters */ |
| bitvec_set_bit(&bv, 0); |
| /* No extension (length) */ |
| bitvec_set_bit(&bv, 0); |
| |
| rc = SI2Q_MAX_LEN - (bv.cur_bit + 3); |
| if (rc > 0 && uarfcn_length - *u_offset > 0) |
| append_uarfcns(&bv, uarfcn_list, u_offset, uarfcn_length, scramble_list, rc); |
| else /* No 3G Neighbour Cell Description */ |
| bitvec_set_bit(&bv, 0); |
| |
| /* No 3G Measurement Parameters Description */ |
| bitvec_set_bit(&bv, 0); |
| /* No GPRS_3G_MEASUREMENT Parameters Descr. */ |
| bitvec_set_bit(&bv, 0); |
| |
| rc = SI2Q_MAX_LEN - bv.cur_bit; |
| if (rc > 0 && si2q_earfcn_count(si2quater_neigh_list) - *e_offset > 0) |
| append_earfcn(&bv, si2quater_neigh_list, e_offset, rc); |
| else /* No Additions in Rel-5: */ |
| bitvec_set_bit(&bv, L); |
| |
| bitvec_spare_padding(&bv, (bv.data_len * 8) - 1); |
| return bv.data_len; |
| } |
| |
| /* Append selection parameters to bitvec */ |
| static void append_selection_params(struct bitvec *bv, |
| const struct osmo_gsm48_si_selection_params *sp) |
| { |
| if (sp->present) { |
| bitvec_set_bit(bv, H); |
| bitvec_set_bit(bv, sp->cbq); |
| bitvec_set_uint(bv, sp->cell_resel_off, 6); |
| bitvec_set_uint(bv, sp->temp_offs, 3); |
| bitvec_set_uint(bv, sp->penalty_time, 5); |
| } else { |
| bitvec_set_bit(bv, L); |
| } |
| } |
| |
| /* Append power offset to bitvec */ |
| static void append_power_offset(struct bitvec *bv, |
| const struct osmo_gsm48_si_power_offset *po) |
| { |
| if (po->present) { |
| bitvec_set_bit(bv, H); |
| bitvec_set_uint(bv, po->power_offset, 2); |
| } else { |
| bitvec_set_bit(bv, L); |
| } |
| } |
| |
| /* Append GPRS indicator to bitvec */ |
| static void append_gprs_ind(struct bitvec *bv, |
| const struct osmo_gsm48_si3_gprs_ind *gi) |
| { |
| if (gi->present) { |
| bitvec_set_bit(bv, H); |
| bitvec_set_uint(bv, gi->ra_colour, 3); |
| /* 0 == SI13 in BCCH Norm, 1 == SI13 sent on BCCH Ext */ |
| bitvec_set_bit(bv, gi->si13_position); |
| } else { |
| bitvec_set_bit(bv, L); |
| } |
| } |
| |
| /* Generate SI3 Rest Octests (Chapter 10.5.2.34 / Table 10.4.72) */ |
| int osmo_gsm48_rest_octets_si3_encode(uint8_t *data, const struct osmo_gsm48_si_ro_info *si3) |
| { |
| struct bitvec bv; |
| |
| memset(&bv, 0, sizeof(bv)); |
| bv.data = data; |
| bv.data_len = 4; |
| |
| /* Optional Selection Parameters */ |
| append_selection_params(&bv, &si3->selection_params); |
| |
| /* Optional Power Offset */ |
| append_power_offset(&bv, &si3->power_offset); |
| |
| /* Do we have a SI2ter on the BCCH? */ |
| if (si3->si2ter_indicator) |
| bitvec_set_bit(&bv, H); |
| else |
| bitvec_set_bit(&bv, L); |
| |
| /* Early Classmark Sending Control */ |
| if (si3->early_cm_ctrl) |
| bitvec_set_bit(&bv, H); |
| else |
| bitvec_set_bit(&bv, L); |
| |
| /* Do we have a SI Type 9 on the BCCH? */ |
| if (si3->scheduling.present) { |
| bitvec_set_bit(&bv, H); |
| bitvec_set_uint(&bv, si3->scheduling.where, 3); |
| } else { |
| bitvec_set_bit(&bv, L); |
| } |
| |
| /* GPRS Indicator */ |
| append_gprs_ind(&bv, &si3->gprs_ind); |
| |
| /* 3G Early Classmark Sending Restriction. If H, then controlled by |
| * early_cm_ctrl above */ |
| if (si3->early_cm_restrict_3g) |
| bitvec_set_bit(&bv, H); |
| else |
| bitvec_set_bit(&bv, L); |
| |
| if (si3->si2quater_indicator) { |
| bitvec_set_bit(&bv, H); /* indicator struct present */ |
| bitvec_set_uint(&bv, 0, 1); /* message is sent on BCCH Norm */ |
| } |
| |
| bitvec_spare_padding(&bv, (bv.data_len*8)-1); |
| return bv.data_len; |
| } |
| |
| static int append_lsa_params(struct bitvec *bv, |
| const struct osmo_gsm48_lsa_params *lsa_params) |
| { |
| /* FIXME */ |
| return -1; |
| } |
| |
| /* Generate SI4 Rest Octets (Chapter 10.5.2.35) */ |
| int osmo_gsm48_rest_octets_si4_encode(uint8_t *data, const struct osmo_gsm48_si_ro_info *si4, int len) |
| { |
| struct bitvec bv; |
| |
| memset(&bv, 0, sizeof(bv)); |
| bv.data = data; |
| bv.data_len = len; |
| |
| /* SI4 Rest Octets O */ |
| append_selection_params(&bv, &si4->selection_params); |
| append_power_offset(&bv, &si4->power_offset); |
| append_gprs_ind(&bv, &si4->gprs_ind); |
| |
| if (0 /* FIXME */) { |
| /* H and SI4 Rest Octets S */ |
| bitvec_set_bit(&bv, H); |
| |
| /* LSA Parameters */ |
| if (si4->lsa_params.present) { |
| bitvec_set_bit(&bv, H); |
| append_lsa_params(&bv, &si4->lsa_params); |
| } else { |
| bitvec_set_bit(&bv, L); |
| } |
| |
| /* Cell Identity */ |
| if (1) { |
| bitvec_set_bit(&bv, H); |
| bitvec_set_uint(&bv, si4->cell_id, 16); |
| } else { |
| bitvec_set_bit(&bv, L); |
| } |
| |
| /* LSA ID Information */ |
| if (0) { |
| bitvec_set_bit(&bv, H); |
| /* FIXME */ |
| } else { |
| bitvec_set_bit(&bv, L); |
| } |
| } else { |
| /* L and break indicator */ |
| bitvec_set_bit(&bv, L); |
| bitvec_set_bit(&bv, si4->break_ind ? H : L); |
| } |
| |
| return bv.data_len; |
| } |
| |
| |
| /* GSM 04.18 ETSI TS 101 503 V8.27.0 (2006-05) |
| |
| <SI6 rest octets> ::= |
| {L | H <PCH and NCH info>} |
| {L | H <VBS/VGCS options : bit(2)>} |
| { < DTM_support : bit == L > I < DTM_support : bit == H > |
| < RAC : bit (8) > |
| < MAX_LAPDm : bit (3) > } |
| < Band indicator > |
| { L | H < GPRS_MS_TXPWR_MAX_CCH : bit (5) > } |
| <implicit spare >; |
| */ |
| int osmo_gsm48_rest_octets_si6_encode(uint8_t *data, const struct osmo_gsm48_si6_ro_info *in) |
| { |
| struct bitvec bv; |
| |
| memset(&bv, 0, sizeof(bv)); |
| bv.data = data; |
| bv.data_len = 1; |
| |
| if (in->pch_nch_info.present) { |
| bitvec_set_bit(&bv, H); |
| bitvec_set_bit(&bv, !!in->pch_nch_info.paging_channel_restructuring); |
| bitvec_set_uint(&bv, in->pch_nch_info.nln_sacch, 2); |
| if (in->pch_nch_info.call_priority_present) { |
| bitvec_set_bit(&bv, 1); |
| bitvec_set_uint(&bv, in->pch_nch_info.call_priority, 3); |
| } else { |
| bitvec_set_bit(&bv, 0); |
| } |
| bitvec_set_bit(&bv, !!in->pch_nch_info.nln_status_sacch); |
| } else { |
| bitvec_set_bit(&bv, L); |
| } |
| |
| if (in->vbs_vgcs_options.present) { |
| bitvec_set_bit(&bv, H); |
| bitvec_set_bit(&bv, !!in->vbs_vgcs_options.inband_notifications); |
| bitvec_set_bit(&bv, !!in->vbs_vgcs_options.inband_pagings); |
| } else { |
| bitvec_set_bit(&bv, L); |
| } |
| |
| if (in->dtm_support.present) { |
| bitvec_set_bit(&bv, H); |
| bitvec_set_uint(&bv, in->dtm_support.rac, 8); |
| bitvec_set_uint(&bv, in->dtm_support.max_lapdm, 3); |
| } else { |
| bitvec_set_bit(&bv, L); |
| } |
| |
| if (in->band_indicator_1900) |
| bitvec_set_bit(&bv, H); |
| else |
| bitvec_set_bit(&bv, L); |
| |
| if (in->gprs_ms_txpwr_max_ccch.present) { |
| bitvec_set_bit(&bv, H); |
| bitvec_set_uint(&bv, in->gprs_ms_txpwr_max_ccch.max_txpwr, 5); |
| } else { |
| bitvec_set_bit(&bv, L); |
| } |
| |
| bitvec_spare_padding(&bv, (bv.data_len * 8) - 1); |
| return bv.data_len; |
| } |
| |
| /* GPRS Mobile Allocation as per TS 04.60 Chapter 12.10a: |
| < GPRS Mobile Allocation IE > ::= |
| < HSN : bit (6) > |
| { 0 | 1 < RFL number list : < RFL number list struct > > } |
| { 0 < MA_LENGTH : bit (6) > |
| < MA_BITMAP: bit (val(MA_LENGTH) + 1) > |
| | 1 { 0 | 1 <ARFCN index list : < ARFCN index list struct > > } } ; |
| |
| < RFL number list struct > :: = |
| < RFL_NUMBER : bit (4) > |
| { 0 | 1 < RFL number list struct > } ; |
| < ARFCN index list struct > ::= |
| < ARFCN_INDEX : bit(6) > |
| { 0 | 1 < ARFCN index list struct > } ; |
| */ |
| static int append_gprs_mobile_alloc(struct bitvec *bv) |
| { |
| /* Hopping Sequence Number */ |
| bitvec_set_uint(bv, 0, 6); |
| |
| if (0) { |
| /* We want to use a RFL number list */ |
| bitvec_set_bit(bv, 1); |
| /* FIXME: RFL number list */ |
| } else { |
| bitvec_set_bit(bv, 0); |
| } |
| |
| if (0) { |
| /* We want to use a MA_BITMAP */ |
| bitvec_set_bit(bv, 0); |
| /* FIXME: MA_LENGTH, MA_BITMAP, ... */ |
| } else { |
| bitvec_set_bit(bv, 1); |
| if (0) { |
| /* We want to provide an ARFCN index list */ |
| bitvec_set_bit(bv, 1); |
| /* FIXME */ |
| } else { |
| bitvec_set_bit(bv, 0); |
| } |
| } |
| return 0; |
| } |
| |
| static int encode_t3192(unsigned int t3192) |
| { |
| /* See also 3GPP TS 44.060 |
| Table 12.24.2: GPRS Cell Options information element details */ |
| if (t3192 == 0) |
| return 3; |
| else if (t3192 <= 80) |
| return 4; |
| else if (t3192 <= 120) |
| return 5; |
| else if (t3192 <= 160) |
| return 6; |
| else if (t3192 <= 200) |
| return 7; |
| else if (t3192 <= 500) |
| return 0; |
| else if (t3192 <= 1000) |
| return 1; |
| else if (t3192 <= 1500) |
| return 2; |
| else |
| return -EINVAL; |
| } |
| |
| static int encode_drx_timer(unsigned int drx) |
| { |
| if (drx == 0) |
| return 0; |
| else if (drx == 1) |
| return 1; |
| else if (drx == 2) |
| return 2; |
| else if (drx <= 4) |
| return 3; |
| else if (drx <= 8) |
| return 4; |
| else if (drx <= 16) |
| return 5; |
| else if (drx <= 32) |
| return 6; |
| else if (drx <= 64) |
| return 7; |
| else |
| return -EINVAL; |
| } |
| |
| /* GPRS Cell Options as per TS 04.60 Chapter 12.24 |
| < GPRS Cell Options IE > ::= |
| < NMO : bit(2) > |
| < T3168 : bit(3) > |
| < T3192 : bit(3) > |
| < DRX_TIMER_MAX: bit(3) > |
| < ACCESS_BURST_TYPE: bit > |
| < CONTROL_ACK_TYPE : bit > |
| < BS_CV_MAX: bit(4) > |
| { 0 | 1 < PAN_DEC : bit(3) > |
| < PAN_INC : bit(3) > |
| < PAN_MAX : bit(3) > |
| { 0 | 1 < Extension Length : bit(6) > |
| < bit (val(Extension Length) + 1 |
| & { < Extension Information > ! { bit ** = <no string> } } ; |
| < Extension Information > ::= |
| { 0 | 1 < EGPRS_PACKET_CHANNEL_REQUEST : bit > |
| < BEP_PERIOD : bit(4) > } |
| < PFC_FEATURE_MODE : bit > |
| < DTM_SUPPORT : bit > |
| <BSS_PAGING_COORDINATION: bit > |
| <spare bit > ** ; |
| */ |
| static int append_gprs_cell_opt(struct bitvec *bv, |
| const struct osmo_gprs_cell_options *gco) |
| { |
| int t3192, drx_timer_max; |
| |
| t3192 = encode_t3192(gco->t3192); |
| if (t3192 < 0) |
| return t3192; |
| |
| drx_timer_max = encode_drx_timer(gco->drx_timer_max); |
| if (drx_timer_max < 0) |
| return drx_timer_max; |
| |
| bitvec_set_uint(bv, gco->nmo, 2); |
| |
| /* See also 3GPP TS 44.060 |
| Table 12.24.2: GPRS Cell Options information element details */ |
| bitvec_set_uint(bv, gco->t3168 / 500 - 1, 3); |
| |
| bitvec_set_uint(bv, t3192, 3); |
| bitvec_set_uint(bv, drx_timer_max, 3); |
| /* ACCESS_BURST_TYPE: Hard-code 8bit */ |
| bitvec_set_bit(bv, 0); |
| /* CONTROL_ACK_TYPE: */ |
| bitvec_set_bit(bv, gco->ctrl_ack_type_use_block); |
| bitvec_set_uint(bv, gco->bs_cv_max, 4); |
| |
| if (0) { |
| /* hard-code no PAN_{DEC,INC,MAX} */ |
| bitvec_set_bit(bv, 0); |
| } else { |
| /* copied from ip.access BSC protocol trace */ |
| bitvec_set_bit(bv, 1); |
| bitvec_set_uint(bv, 1, 3); /* DEC */ |
| bitvec_set_uint(bv, 1, 3); /* INC */ |
| bitvec_set_uint(bv, 15, 3); /* MAX */ |
| } |
| |
| if (!gco->ext_info_present) { |
| /* no extension information */ |
| bitvec_set_bit(bv, 0); |
| } else { |
| /* extension information */ |
| bitvec_set_bit(bv, 1); |
| if (!gco->ext_info.egprs_supported) { |
| /* 6bit length of extension */ |
| bitvec_set_uint(bv, (1 + 3)-1, 6); |
| /* EGPRS supported in the cell */ |
| bitvec_set_bit(bv, 0); |
| } else { |
| /* 6bit length of extension */ |
| bitvec_set_uint(bv, (1 + 5 + 3)-1, 6); |
| /* EGPRS supported in the cell */ |
| bitvec_set_bit(bv, 1); |
| |
| /* 1bit EGPRS PACKET CHANNEL REQUEST */ |
| if (gco->supports_egprs_11bit_rach == 0) { |
| bitvec_set_bit(bv, |
| gco->ext_info.use_egprs_p_ch_req); |
| } else { |
| bitvec_set_bit(bv, 0); |
| } |
| |
| /* 4bit BEP PERIOD */ |
| bitvec_set_uint(bv, gco->ext_info.bep_period, 4); |
| } |
| bitvec_set_bit(bv, gco->ext_info.pfc_supported); |
| bitvec_set_bit(bv, gco->ext_info.dtm_supported); |
| bitvec_set_bit(bv, gco->ext_info.bss_paging_coordination); |
| } |
| |
| return 0; |
| } |
| |
| static void append_gprs_pwr_ctrl_pars(struct bitvec *bv, |
| const struct osmo_gprs_power_ctrl_pars *pcp) |
| { |
| bitvec_set_uint(bv, pcp->alpha, 4); |
| bitvec_set_uint(bv, pcp->t_avg_w, 5); |
| bitvec_set_uint(bv, pcp->t_avg_t, 5); |
| bitvec_set_uint(bv, pcp->pc_meas_chan, 1); |
| bitvec_set_uint(bv, pcp->n_avg_i, 4); |
| } |
| |
| /* Generate SI13 Rest Octests (04.08 Chapter 10.5.2.37b) */ |
| int osmo_gsm48_rest_octets_si13_encode(uint8_t *data, const struct osmo_gsm48_si13_info *si13) |
| { |
| struct bitvec bv; |
| |
| memset(&bv, 0, sizeof(bv)); |
| bv.data = data; |
| bv.data_len = 20; |
| |
| if (0) { |
| /* No rest octets */ |
| bitvec_set_bit(&bv, L); |
| } else { |
| bitvec_set_bit(&bv, H); |
| bitvec_set_uint(&bv, si13->bcch_change_mark, 3); |
| bitvec_set_uint(&bv, si13->si_change_field, 4); |
| if (1) { |
| bitvec_set_bit(&bv, 0); |
| } else { |
| bitvec_set_bit(&bv, 1); |
| bitvec_set_uint(&bv, si13->bcch_change_mark, 2); |
| append_gprs_mobile_alloc(&bv); |
| } |
| /* PBCCH not present in cell: |
| it shall never be indicated according to 3GPP TS 44.018 Table 10.5.2.37b.1 */ |
| bitvec_set_bit(&bv, 0); |
| bitvec_set_uint(&bv, si13->rac, 8); |
| bitvec_set_bit(&bv, si13->spgc_ccch_sup); |
| bitvec_set_uint(&bv, si13->prio_acc_thr, 3); |
| bitvec_set_uint(&bv, si13->net_ctrl_ord, 2); |
| append_gprs_cell_opt(&bv, &si13->cell_opts); |
| append_gprs_pwr_ctrl_pars(&bv, &si13->pwr_ctrl_pars); |
| |
| /* 3GPP TS 44.018 Release 6 / 10.5.2.37b */ |
| bitvec_set_bit(&bv, H); /* added Release 99 */ |
| /* claim our SGSN is compatible with Release 99, as EDGE and EGPRS |
| * was only added in this Release */ |
| bitvec_set_bit(&bv, 1); |
| } |
| bitvec_spare_padding(&bv, (bv.data_len*8)-1); |
| return bv.data_len; |
| } |
| |
| |
| /*********************************************************************** |
| * Decoder |
| ***********************************************************************/ |
| |
| /*! Decode SI3 Rest Octests (Chapter 10.5.2.34 / Table 10.4.72). |
| * \param[out] si3 decoded SI3 rest octets |
| * \param[in] encoded SI3 rest octets, 4 octets long */ |
| void osmo_gsm48_rest_octets_si3_decode(struct osmo_gsm48_si_ro_info *si3, const uint8_t *data) |
| { |
| struct osmo_gsm48_si_selection_params *sp = &si3->selection_params; |
| struct osmo_gsm48_si_power_offset *po = &si3->power_offset; |
| struct osmo_gsm48_si3_gprs_ind *gi = &si3->gprs_ind; |
| struct bitvec bv; |
| |
| memset(&bv, 0, sizeof(bv)); |
| bv.data = (uint8_t *) data; |
| bv.data_len = 4; |
| |
| memset(si3, 0, sizeof(*si3)); |
| |
| /* Optional Selection Parameters */ |
| if (bitvec_get_bit_high(&bv) == H) { |
| sp->present = 1; |
| sp->cbq = bitvec_get_uint(&bv, 1); |
| sp->cell_resel_off = bitvec_get_uint(&bv, 6); |
| sp->temp_offs = bitvec_get_uint(&bv, 3); |
| sp->penalty_time = bitvec_get_uint(&bv, 5); |
| } else { |
| sp->present = 0; |
| } |
| |
| /* Optional Power Offset */ |
| if (bitvec_get_bit_high(&bv) == H) { |
| po->present = 1; |
| po->power_offset = bitvec_get_uint(&bv, 2); |
| } else { |
| po->present = 0; |
| } |
| |
| /* System Information 2ter Indicator */ |
| if (bitvec_get_bit_high(&bv) == H) |
| si3->si2ter_indicator = 1; |
| else |
| si3->si2ter_indicator = 0; |
| |
| /* Early Classmark Sending Control */ |
| if (bitvec_get_bit_high(&bv) == H) |
| si3->early_cm_ctrl = 1; |
| else |
| si3->early_cm_ctrl = 0; |
| |
| /* Scheduling if and where */ |
| if (bitvec_get_bit_high(&bv) == H) { |
| si3->scheduling.present = 1; |
| si3->scheduling.where = bitvec_get_uint(&bv, 3); |
| } else { |
| si3->scheduling.present = 0; |
| } |
| |
| /* GPRS Indicator */ |
| if (bitvec_get_bit_high(&bv) == H) { |
| gi->present = 1; |
| gi->ra_colour = bitvec_get_uint(&bv, 3); |
| gi->si13_position = bitvec_get_uint(&bv, 1); |
| } else { |
| gi->present = 0; |
| } |
| |
| /* 3G Early Classmark Sending Restriction. If H, then controlled by |
| * early_cm_ctrl above */ |
| if (bitvec_get_bit_high(&bv) == H) |
| si3->early_cm_restrict_3g = 1; |
| else |
| si3->early_cm_restrict_3g = 0; |
| |
| if (bitvec_get_bit_high(&bv) == H) |
| si3->si2quater_indicator = 1; |
| else |
| si3->si2quater_indicator = 0; |
| } |
| |
| |
| void osmo_gsm48_rest_octets_si4_decode(struct osmo_gsm48_si_ro_info *si4, const uint8_t *data, int len) |
| { |
| struct osmo_gsm48_si_selection_params *sp = &si4->selection_params; |
| struct osmo_gsm48_si_power_offset *po = &si4->power_offset; |
| struct osmo_gsm48_si3_gprs_ind *gi = &si4->gprs_ind; |
| struct bitvec bv; |
| |
| memset(&bv, 0, sizeof(bv)); |
| bv.data = (uint8_t *) data; |
| bv.data_len = len; |
| |
| memset(si4, 0, sizeof(*si4)); |
| |
| /* Optional Selection Parameters */ |
| if (bitvec_get_bit_high(&bv) == H) { |
| sp->present = 1; |
| sp->cbq = bitvec_get_uint(&bv, 1); |
| sp->cell_resel_off = bitvec_get_uint(&bv, 6); |
| sp->temp_offs = bitvec_get_uint(&bv, 3); |
| sp->penalty_time = bitvec_get_uint(&bv, 5); |
| } else { |
| sp->present = 0; |
| } |
| |
| /* Optional Power Offset */ |
| if (bitvec_get_bit_high(&bv) == H) { |
| po->present = 1; |
| po->power_offset = bitvec_get_uint(&bv, 2); |
| } else { |
| po->present = 0; |
| } |
| |
| /* GPRS Indicator */ |
| if (bitvec_get_bit_high(&bv) == H) { |
| gi->present = 1; |
| gi->ra_colour = bitvec_get_uint(&bv, 3); |
| gi->si13_position = bitvec_get_uint(&bv, 1); |
| } else { |
| gi->present = 0; |
| } |
| } |