| /* |
| * (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> |
| * |
| * 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 <openbsc/gsm_data.h> |
| #include <osmocore/utils.h> |
| #include <osmocore/gsm_utils.h> |
| |
| #include <stdlib.h> |
| #include <stdint.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include <ctype.h> |
| |
| #include "../config.h" |
| |
| /* GSM 03.38 6.2.1 Charachter packing */ |
| int gsm_7bit_decode(char *text, const uint8_t *user_data, uint8_t length) |
| { |
| int i = 0; |
| int l = 0; |
| |
| /* FIXME: We need to account for user data headers here */ |
| i += l; |
| for (; i < length; i ++) |
| *(text ++) = |
| ((user_data[(i * 7 + 7) >> 3] << |
| (7 - ((i * 7 + 7) & 7))) | |
| (user_data[(i * 7) >> 3] >> |
| ((i * 7) & 7))) & 0x7f; |
| *text = '\0'; |
| |
| return i - l; |
| } |
| |
| |
| /* GSM 03.38 6.2.1 Charachter packing */ |
| int gsm_7bit_encode(uint8_t *result, const char *data) |
| { |
| int i,j = 0; |
| unsigned char ch1, ch2; |
| int shift = 0; |
| |
| for ( i=0; i<strlen(data); i++ ) { |
| |
| ch1 = data[i] & 0x7F; |
| ch1 = ch1 >> shift; |
| ch2 = data[(i+1)] & 0x7F; |
| ch2 = ch2 << (7-shift); |
| |
| ch1 = ch1 | ch2; |
| |
| result[j++] = ch1; |
| |
| shift++; |
| |
| if ((shift == 7) && (i+1<strlen(data))) { |
| shift = 0; |
| i++; |
| } |
| } |
| |
| return i; |
| } |
| |
| /* determine power control level for given dBm value, as indicated |
| * by the tables in chapter 4.1.1 of GSM TS 05.05 */ |
| int ms_pwr_ctl_lvl(enum gsm_band band, unsigned int dbm) |
| { |
| switch (band) { |
| case GSM_BAND_450: |
| case GSM_BAND_480: |
| case GSM_BAND_750: |
| case GSM_BAND_900: |
| case GSM_BAND_810: |
| case GSM_BAND_850: |
| if (dbm >= 39) |
| return 0; |
| else if (dbm < 5) |
| return 19; |
| else { |
| /* we are guaranteed to have (5 <= dbm < 39) */ |
| return 2 + ((39 - dbm) / 2); |
| } |
| break; |
| case GSM_BAND_1800: |
| if (dbm >= 36) |
| return 29; |
| else if (dbm >= 34) |
| return 30; |
| else if (dbm >= 32) |
| return 31; |
| else if (dbm == 31) |
| return 0; |
| else { |
| /* we are guaranteed to have (0 <= dbm < 31) */ |
| return (30 - dbm) / 2; |
| } |
| break; |
| case GSM_BAND_1900: |
| if (dbm >= 33) |
| return 30; |
| else if (dbm >= 32) |
| return 31; |
| else if (dbm == 31) |
| return 0; |
| else { |
| /* we are guaranteed to have (0 <= dbm < 31) */ |
| return (30 - dbm) / 2; |
| } |
| break; |
| } |
| return -EINVAL; |
| } |
| |
| int ms_pwr_dbm(enum gsm_band band, uint8_t lvl) |
| { |
| lvl &= 0x1f; |
| |
| switch (band) { |
| case GSM_BAND_450: |
| case GSM_BAND_480: |
| case GSM_BAND_750: |
| case GSM_BAND_900: |
| case GSM_BAND_810: |
| case GSM_BAND_850: |
| if (lvl < 2) |
| return 39; |
| else if (lvl < 20) |
| return 39 - ((lvl - 2) * 2) ; |
| else |
| return 5; |
| break; |
| case GSM_BAND_1800: |
| if (lvl < 16) |
| return 30 - (lvl * 2); |
| else if (lvl < 29) |
| return 0; |
| else |
| return 36 - ((lvl - 29) * 2); |
| break; |
| case GSM_BAND_1900: |
| if (lvl < 16) |
| return 30 - (lvl * 2); |
| else if (lvl < 30) |
| return -EINVAL; |
| else |
| return 33 - (lvl - 30); |
| break; |
| } |
| return -EINVAL; |
| } |
| |
| /* According to TS 08.05 Chapter 8.1.4 */ |
| int rxlev2dbm(uint8_t rxlev) |
| { |
| if (rxlev > 63) |
| rxlev = 63; |
| |
| return -110 + rxlev; |
| } |
| |
| /* According to TS 08.05 Chapter 8.1.4 */ |
| uint8_t dbm2rxlev(int dbm) |
| { |
| int rxlev = dbm + 110; |
| |
| if (rxlev > 63) |
| rxlev = 63; |
| else if (rxlev < 0) |
| rxlev = 0; |
| |
| return rxlev; |
| } |
| |
| const char *gsm_band_name(enum gsm_band band) |
| { |
| switch (band) { |
| case GSM_BAND_450: |
| return "GSM450"; |
| case GSM_BAND_480: |
| return "GSM450"; |
| case GSM_BAND_750: |
| return "GSM750"; |
| case GSM_BAND_810: |
| return "GSM810"; |
| case GSM_BAND_850: |
| return "GSM850"; |
| case GSM_BAND_900: |
| return "GSM900"; |
| case GSM_BAND_1800: |
| return "DCS1800"; |
| case GSM_BAND_1900: |
| return "PCS1900"; |
| } |
| return "invalid"; |
| } |
| |
| enum gsm_band gsm_band_parse(const char* mhz) |
| { |
| while (*mhz && !isdigit(*mhz)) |
| mhz++; |
| |
| if (*mhz == '\0') |
| return -EINVAL; |
| |
| switch (strtol(mhz, NULL, 10)) { |
| case 450: |
| return GSM_BAND_450; |
| case 480: |
| return GSM_BAND_480; |
| case 750: |
| return GSM_BAND_750; |
| case 810: |
| return GSM_BAND_810; |
| case 850: |
| return GSM_BAND_850; |
| case 900: |
| return GSM_BAND_900; |
| case 1800: |
| return GSM_BAND_1800; |
| case 1900: |
| return GSM_BAND_1900; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| |
| #ifdef HAVE_EXECINFO_H |
| #include <execinfo.h> |
| void generate_backtrace() |
| { |
| int i, nptrs; |
| void *buffer[100]; |
| char **strings; |
| |
| nptrs = backtrace(buffer, ARRAY_SIZE(buffer)); |
| printf("backtrace() returned %d addresses\n", nptrs); |
| |
| strings = backtrace_symbols(buffer, nptrs); |
| if (!strings) |
| return; |
| |
| for (i = 1; i < nptrs; i++) |
| printf("%s\n", strings[i]); |
| |
| free(strings); |
| } |
| #endif |
| |
| enum gsm_band gsm_arfcn2band(uint16_t arfcn) |
| { |
| if (arfcn & ARFCN_PCS) |
| return GSM_BAND_1900; |
| else if (arfcn <= 124) |
| return GSM_BAND_900; |
| else if (arfcn >= 955 && arfcn <= 1023) |
| return GSM_BAND_900; |
| else if (arfcn >= 128 && arfcn <= 251) |
| return GSM_BAND_850; |
| else if (arfcn >= 512 && arfcn <= 885) |
| return GSM_BAND_1800; |
| else if (arfcn >= 259 && arfcn <= 293) |
| return GSM_BAND_450; |
| else if (arfcn >= 306 && arfcn <= 340) |
| return GSM_BAND_480; |
| else if (arfcn >= 350 && arfcn <= 425) |
| return GSM_BAND_810; |
| else if (arfcn >= 438 && arfcn <= 511) |
| return GSM_BAND_750; |
| else |
| return GSM_BAND_1800; |
| } |
| |
| /* Convert an ARFCN to the frequency in MHz * 10 */ |
| uint16_t gsm_arfcn2freq10(uint16_t arfcn, int uplink) |
| { |
| uint16_t freq10_ul; |
| uint16_t freq10_dl; |
| |
| if (arfcn & ARFCN_PCS) { |
| /* DCS 1900 */ |
| arfcn &= ~ARFCN_PCS; |
| freq10_ul = 18502 + 2 * (arfcn-512); |
| freq10_dl = freq10_ul + 800; |
| } else if (arfcn <= 124) { |
| /* Primary GSM + ARFCN 0 of E-GSM */ |
| freq10_ul = 8900 + 2 * arfcn; |
| freq10_dl = freq10_ul + 450; |
| } else if (arfcn >= 955 && arfcn <= 1023) { |
| /* E-GSM and R-GSM */ |
| freq10_ul = 8900 + 2 * (arfcn - 1024); |
| freq10_dl = freq10_ul + 450; |
| } else if (arfcn >= 128 && arfcn <= 251) { |
| /* GSM 850 */ |
| freq10_ul = 8242 + 2 * (arfcn - 128); |
| freq10_dl = freq10_ul + 450; |
| } else if (arfcn >= 512 && arfcn <= 885) { |
| /* DCS 1800 */ |
| freq10_ul = 17102 + 2 * (arfcn - 512); |
| freq10_dl = freq10_ul + 950; |
| } else if (arfcn >= 259 && arfcn <= 293) { |
| /* GSM 450 */ |
| freq10_ul = 4506 + 2 * (arfcn - 259); |
| freq10_dl = freq10_ul + 100; |
| } else if (arfcn >= 306 && arfcn <= 340) { |
| /* GSM 480 */ |
| freq10_ul = 4790 + 2 * (arfcn - 306); |
| freq10_dl = freq10_ul + 100; |
| } else if (arfcn >= 350 && arfcn <= 425) { |
| /* GSM 810 */ |
| freq10_ul = 8060 + 2 * (arfcn - 350); |
| freq10_dl = freq10_ul + 450; |
| } else if (arfcn >= 438 && arfcn <= 511) { |
| /* GSM 750 */ |
| freq10_ul = 7472 + 2 * (arfcn - 438); |
| freq10_dl = freq10_ul + 300; |
| } else |
| return 0xffff; |
| |
| if (uplink) |
| return freq10_ul; |
| else |
| return freq10_dl; |
| } |
| |
| void gsm_fn2gsmtime(struct gsm_time *time, uint32_t fn) |
| { |
| time->fn = fn; |
| time->t1 = time->fn / (26*51); |
| time->t2 = time->fn % 26; |
| time->t3 = time->fn % 51; |
| time->tc = (time->fn / 51) % 8; |
| } |
| |
| uint32_t gsm_gsmtime2fn(struct gsm_time *time) |
| { |
| /* TS 05.02 Chapter 4.3.3 TDMA frame number */ |
| return (51 * ((time->t3 - time->t2 + 26) % 26) + time->t3 + (26 * 51 * time->t1)); |
| } |
| |
| /* TS 03.03 Chapter 2.6 */ |
| int gprs_tlli_type(uint32_t tlli) |
| { |
| if ((tlli & 0xc0000000) == 0xc0000000) |
| return TLLI_LOCAL; |
| else if ((tlli & 0xc0000000) == 0x80000000) |
| return TLLI_FOREIGN; |
| else if ((tlli & 0xf8000000) == 0x78000000) |
| return TLLI_RANDOM; |
| else if ((tlli & 0xf8000000) == 0x70000000) |
| return TLLI_AUXILIARY; |
| |
| return TLLI_RESERVED; |
| } |