| /* 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, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| |
| #include <string.h> |
| #include <stdlib.h> |
| #include <errno.h> |
| |
| #include <openbsc/gsm_data.h> |
| #include <osmocore/bitvec.h> |
| #include <openbsc/rest_octets.h> |
| |
| /* generate SI1 rest octets */ |
| int rest_octets_si1(u_int8_t *data, u_int8_t *nch_pos) |
| { |
| 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); |
| |
| bitvec_spare_padding(&bv, 7); |
| return bv.data_len; |
| } |
| |
| /* Append selection parameters to bitvec */ |
| static void append_selection_params(struct bitvec *bv, |
| const struct 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 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 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 rest_octets_si3(u_int8_t *data, const struct 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); |
| |
| bitvec_spare_padding(&bv, (bv.data_len*8)-1); |
| return bv.data_len; |
| } |
| |
| static int append_lsa_params(struct bitvec *bv, |
| const struct gsm48_lsa_params *lsa_params) |
| { |
| /* FIXME */ |
| return -1; |
| } |
| |
| /* Generate SI4 Rest Octets (Chapter 10.5.2.35) */ |
| int rest_octets_si4(u_int8_t *data, const struct gsm48_si_ro_info *si4) |
| { |
| struct bitvec bv; |
| |
| memset(&bv, 0, sizeof(bv)); |
| bv.data = data; |
| bv.data_len = 10; /* FIXME: up to ? */ |
| |
| /* 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; |
| } |
| |
| /* 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) |
| { |
| 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 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); |
| bitvec_set_uint(bv, gco->t3168 / 500, 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: Hard-code to RLC/MAC control block */ |
| bitvec_set_bit(bv, 1); |
| bitvec_set_uint(bv, gco->bs_cv_max, 4); |
| |
| /* hard-code no PAN_{DEC,INC,MAX} */ |
| bitvec_set_bit(bv, 0); |
| |
| 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 */ |
| bitvec_set_bit(bv, gco->ext_info.use_egprs_p_ch_req); |
| /* 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 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 rest_octets_si13(u_int8_t *data, const struct 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); |
| } |
| if (!si13->pbcch_present) { |
| /* PBCCH not present in cell */ |
| bitvec_set_bit(&bv, 0); |
| bitvec_set_uint(&bv, si13->no_pbcch.rac, 8); |
| bitvec_set_bit(&bv, si13->no_pbcch.spgc_ccch_sup); |
| bitvec_set_uint(&bv, si13->no_pbcch.prio_acc_thr, 3); |
| bitvec_set_uint(&bv, si13->no_pbcch.net_ctrl_ord, 2); |
| append_gprs_cell_opt(&bv, &si13->cell_opts); |
| append_gprs_pwr_ctrl_pars(&bv, &si13->pwr_ctrl_pars); |
| } else { |
| /* PBCCH present in cell */ |
| bitvec_set_bit(&bv, 1); |
| bitvec_set_uint(&bv, si13->pbcch.psi1_rep_per, 4); |
| /* PBCCH Descripiton */ |
| bitvec_set_uint(&bv, si13->pbcch.pb, 4); |
| bitvec_set_uint(&bv, si13->pbcch.tsc, 3); |
| bitvec_set_uint(&bv, si13->pbcch.tn, 3); |
| switch (si13->pbcch.carrier_type) { |
| case PBCCH_BCCH: |
| bitvec_set_bit(&bv, 0); |
| bitvec_set_bit(&bv, 0); |
| break; |
| case PBCCH_ARFCN: |
| bitvec_set_bit(&bv, 0); |
| bitvec_set_bit(&bv, 1); |
| bitvec_set_uint(&bv, si13->pbcch.arfcn, 10); |
| break; |
| case PBCCH_MAIO: |
| bitvec_set_bit(&bv, 1); |
| bitvec_set_uint(&bv, si13->pbcch.maio, 6); |
| break; |
| } |
| } |
| /* 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; |
| } |