| /* GSM utility functions, e.g. coding and decoding */ |
| /* |
| * (C) 2008 by Daniel Willmann <daniel@totalueberwachung.de> |
| * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * (C) 2009-2010 by Harald Welte <laforge@gnumonks.org> |
| * (C) 2010 by Nico Golde <nico@ngolde.de> |
| * |
| * 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. |
| * |
| */ |
| |
| #ifndef GSM_UTILS_H |
| #define GSM_UTILS_H |
| |
| #include <stdint.h> |
| |
| #define ADD_MODULO(sum, delta, modulo) do { \ |
| if ((sum += delta) >= modulo) \ |
| sum -= modulo; \ |
| } while (0) |
| |
| #define GSM_MAX_FN (26*51*2048) |
| |
| struct gsm_time { |
| uint32_t fn; /* FN count */ |
| uint16_t t1; /* FN div (26*51) */ |
| uint8_t t2; /* FN modulo 26 */ |
| uint8_t t3; /* FN modulo 51 */ |
| uint8_t tc; |
| }; |
| |
| enum gsm_band { |
| GSM_BAND_850 = 1, |
| GSM_BAND_900 = 2, |
| GSM_BAND_1800 = 4, |
| GSM_BAND_1900 = 8, |
| GSM_BAND_450 = 0x10, |
| GSM_BAND_480 = 0x20, |
| GSM_BAND_750 = 0x40, |
| GSM_BAND_810 = 0x80, |
| }; |
| |
| /* ETSI GSM 03.38 6.2.1 and 6.2.1.1 default alphabet |
| * Greek symbols at hex positions 0x10 and 0x12-0x1a |
| * left out as they can't be handled with a char and |
| * since most phones don't display or write these |
| * characters this would only needlessly make the code |
| * more complex |
| */ |
| unsigned char gsm_7bit_alphabet[] = { |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x0a, 0xff, 0xff, 0x0d, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0x20, 0x21, 0x22, 0x23, 0x02, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, |
| 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, |
| 0x3c, 0x3d, 0x3e, 0x3f, 0x00, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, |
| 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, |
| 0x5a, 0x3c, 0x2f, 0x3e, 0x14, 0x11, 0xff, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, |
| 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, |
| 0x78, 0x79, 0x7a, 0x28, 0x40, 0x29, 0x3d, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0x0c, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x5e, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x40, 0xff, 0x01, 0xff, |
| 0x03, 0xff, 0x7b, 0x7d, 0xff, 0xff, 0xff, 0xff, 0xff, 0x5c, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x5b, 0x7e, 0x5d, 0xff, 0x7c, 0xff, 0xff, 0xff, |
| 0xff, 0x5b, 0x0e, 0x1c, 0x09, 0xff, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x5d, |
| 0xff, 0xff, 0xff, 0xff, 0x5c, 0xff, 0x0b, 0xff, 0xff, 0xff, 0x5e, 0xff, 0xff, 0x1e, 0x7f, |
| 0xff, 0xff, 0xff, 0x7b, 0x0f, 0x1d, 0xff, 0x04, 0x05, 0xff, 0xff, 0x07, 0xff, 0xff, 0xff, |
| 0xff, 0x7d, 0x08, 0xff, 0xff, 0xff, 0x7c, 0xff, 0x0c, 0x06, 0xff, 0xff, 0x7e, 0xff, 0xff |
| }; |
| |
| const char *gsm_band_name(enum gsm_band band); |
| enum gsm_band gsm_band_parse(const char *mhz); |
| |
| int gsm_7bit_decode(char *decoded, const uint8_t *user_data, uint8_t length); |
| int gsm_7bit_encode(uint8_t *result, const char *data); |
| |
| int ms_pwr_ctl_lvl(enum gsm_band band, unsigned int dbm); |
| int ms_pwr_dbm(enum gsm_band band, uint8_t lvl); |
| |
| /* According to TS 08.05 Chapter 8.1.4 */ |
| int rxlev2dbm(uint8_t rxlev); |
| uint8_t dbm2rxlev(int dbm); |
| |
| /* According to GSM 04.08 Chapter 10.5.1.6 */ |
| static inline int ms_cm2_a5n_support(uint8_t *cm2, int n) { |
| switch (n) { |
| case 0: return 1; |
| case 1: return (cm2[0] & (1<<3)) ? 0 : 1; |
| case 2: return (cm2[2] & (1<<0)) ? 1 : 0; |
| case 3: return (cm2[2] & (1<<1)) ? 1 : 0; |
| default: |
| return 0; |
| } |
| } |
| |
| /* According to GSM 04.08 Chapter 10.5.2.29 */ |
| static inline int rach_max_trans_val2raw(int val) { return (val >> 1) & 3; } |
| static inline int rach_max_trans_raw2val(int raw) { |
| const int tbl[4] = { 1, 2, 4, 7 }; |
| return tbl[raw & 3]; |
| } |
| |
| #define ARFCN_PCS 0x8000 |
| #define ARFCN_UPLINK 0x4000 |
| |
| enum gsm_band gsm_arfcn2band(uint16_t arfcn); |
| |
| /* Convert an ARFCN to the frequency in MHz * 10 */ |
| uint16_t gsm_arfcn2freq10(uint16_t arfcn, int uplink); |
| |
| /* Convert from frame number to GSM time */ |
| void gsm_fn2gsmtime(struct gsm_time *time, uint32_t fn); |
| |
| /* Convert from GSM time to frame number */ |
| uint32_t gsm_gsmtime2fn(struct gsm_time *time); |
| |
| /* GSM TS 03.03 Chapter 2.6 */ |
| enum gprs_tlli_type { |
| TLLI_LOCAL, |
| TLLI_FOREIGN, |
| TLLI_RANDOM, |
| TLLI_AUXILIARY, |
| TLLI_RESERVED, |
| }; |
| |
| /* TS 03.03 Chapter 2.6 */ |
| int gprs_tlli_type(uint32_t tlli); |
| |
| uint32_t gprs_tmsi2tlli(uint32_t p_tmsi, enum gprs_tlli_type type); |
| |
| void generate_backtrace(); |
| #endif |