| /* |
| * (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. |
| * |
| */ |
| |
| //#include <openbsc/gsm_data.h> |
| #include <osmocom/core/utils.h> |
| #include <osmocom/gsm/gsm_utils.h> |
| |
| #include <stdlib.h> |
| #include <stdint.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include <ctype.h> |
| |
| #include "../../config.h" |
| |
| /* 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 |
| */ |
| static 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 |
| }; |
| |
| /* GSM 03.38 6.2.1 Character lookup for decoding */ |
| static int gsm_septet_lookup(uint8_t ch) |
| { |
| int i = 0; |
| for(; i < sizeof(gsm_7bit_alphabet); i++){ |
| if(gsm_7bit_alphabet[i] == ch) |
| return i; |
| } |
| return -1; |
| } |
| |
| /* GSM 03.38 6.2.1 Character unpacking */ |
| int gsm_7bit_decode(char *text, const uint8_t *user_data, uint8_t length) |
| { |
| int i = 0; |
| int l = 0; |
| int septet_l = (length * 8) / 7; |
| uint8_t *rtext = calloc(septet_l, sizeof(uint8_t)); |
| uint8_t tmp; |
| |
| /* FIXME: We need to account for user data headers here */ |
| i += l; |
| for (; i < septet_l; i++){ |
| rtext[i] = |
| ((user_data[(i * 7 + 7) >> 3] << |
| (7 - ((i * 7 + 7) & 7))) | |
| (user_data[(i * 7) >> 3] >> |
| ((i * 7) & 7))) & 0x7f; |
| } |
| |
| for(i = 0; i < septet_l; i++){ |
| /* this is an extension character */ |
| if(rtext[i] == 0x1b && i + 1 < length){ |
| tmp = rtext[i+1]; |
| *(text++) = gsm_7bit_alphabet[0x7f + tmp]; |
| i++; |
| continue; |
| } |
| |
| *(text++) = gsm_septet_lookup(rtext[i]); |
| } |
| |
| *text = '\0'; |
| free(rtext); |
| |
| return i; |
| } |
| |
| /* GSM 03.38 6.2.1 Prepare character packing */ |
| static int gsm_septet_encode(uint8_t *result, const char *data) |
| { |
| int i, y = 0; |
| uint8_t ch; |
| for(i = 0; i < strlen(data); i++){ |
| ch = data[i]; |
| switch(ch){ |
| /* fall-through for extension characters */ |
| case 0x0c: |
| case 0x5e: |
| case 0x7b: |
| case 0x7d: |
| case 0x5c: |
| case 0x5b: |
| case 0x7e: |
| case 0x5d: |
| case 0x7c: |
| result[y++] = 0x1b; |
| default: |
| result[y] = gsm_7bit_alphabet[ch]; |
| break; |
| } |
| y++; |
| } |
| |
| return y; |
| } |
| |
| /* GSM 03.38 6.2.1 Character packing */ |
| int gsm_7bit_encode(uint8_t *result, const char *data) |
| { |
| int i,y,z = 0; |
| /* prepare for the worst case, every character expanding to two bytes */ |
| uint8_t *rdata = calloc(strlen(data) * 2, sizeof(uint8_t)); |
| uint8_t cb, nb; |
| int shift = 0; |
| |
| y = gsm_septet_encode(rdata, data); |
| |
| for(i = 0; i < y; i++) { |
| if(shift == 7 && i + 1 < y){ |
| shift = 0; |
| continue; |
| } |
| |
| cb = (rdata[i] & 0x7f) >> shift; |
| if(i + 1 < y){ |
| nb = (rdata[i + 1] & 0x7f) << (7 - shift); |
| cb = cb | nb; |
| } |
| |
| result[z++] = cb; |
| |
| shift++; |
| } |
| |
| free(rdata); |
| return z; |
| } |
| |
| /* convert power class to dBm according to GSM TS 05.05 */ |
| unsigned int ms_class_gmsk_dbm(enum gsm_band band, int class) |
| { |
| 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 (class == 1) |
| return 43; /* 20W */ |
| if (class == 2) |
| return 39; /* 8W */ |
| if (class == 3) |
| return 37; /* 5W */ |
| if (class == 4) |
| return 33; /* 2W */ |
| if (class == 5) |
| return 29; /* 0.8W */ |
| break; |
| case GSM_BAND_1800: |
| if (class == 1) |
| return 30; /* 1W */ |
| if (class == 2) |
| return 24; /* 0.25W */ |
| if (class == 3) |
| return 36; /* 4W */ |
| break; |
| case GSM_BAND_1900: |
| if (class == 1) |
| return 30; /* 1W */ |
| if (class == 2) |
| return 24; /* 0.25W */ |
| if (class == 3) |
| return 33; /* 2W */ |
| break; |
| } |
| return -EINVAL; |
| } |
| |
| /* 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 "GSM480"; |
| 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; |
| } |
| } |
| |
| enum gsm_band gsm_arfcn2band(uint16_t arfcn) |
| { |
| int is_pcs = arfcn & ARFCN_PCS; |
| |
| arfcn &= ~ARFCN_FLAG_MASK; |
| |
| if (is_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; |
| int is_pcs = arfcn & ARFCN_PCS; |
| |
| arfcn &= ~ARFCN_FLAG_MASK; |
| |
| if (is_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; |
| } |
| |
| uint32_t gprs_tmsi2tlli(uint32_t p_tmsi, enum gprs_tlli_type type) |
| { |
| uint32_t tlli; |
| switch (type) { |
| case TLLI_LOCAL: |
| tlli = p_tmsi | 0xc0000000; |
| break; |
| case TLLI_FOREIGN: |
| tlli = (p_tmsi & 0x3fffffff) | 0x80000000; |
| break; |
| default: |
| tlli = 0; |
| break; |
| } |
| return tlli; |
| } |