2010-02-20 19:34:29 +00:00
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/*
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* (C) 2008 by Daniel Willmann <daniel@totalueberwachung.de>
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* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
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2010-03-07 16:50:21 +00:00
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* (C) 2009-2010 by Harald Welte <laforge@gnumonks.org>
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2010-07-09 15:19:12 +00:00
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* (C) 2010 by Nico Golde <nico@ngolde.de>
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2010-02-20 19:34:29 +00:00
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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//#include <openbsc/gsm_data.h>
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#include <osmocore/utils.h>
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#include <osmocore/gsm_utils.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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2010-03-04 09:39:17 +00:00
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#include <ctype.h>
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2010-02-20 19:34:29 +00:00
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#include "../config.h"
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2010-07-09 15:19:12 +00:00
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/* GSM 03.38 6.2.1 Character lookup for decoding */
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static int gsm_septet_lookup(uint8_t ch)
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{
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int i = 0;
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for(; i < sizeof(gsm_7bit_alphabet); i++){
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if(gsm_7bit_alphabet[i] == ch)
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return i;
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}
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return -1;
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}
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/* GSM 03.38 6.2.1 Character unpacking */
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2010-02-20 19:34:29 +00:00
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int gsm_7bit_decode(char *text, const uint8_t *user_data, uint8_t length)
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{
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int i = 0;
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int l = 0;
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2010-07-09 15:19:12 +00:00
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uint8_t *rtext = calloc(length, sizeof(uint8_t));
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uint8_t tmp;
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2010-02-20 19:34:29 +00:00
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2010-07-09 15:19:12 +00:00
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/* FIXME: We need to account for user data headers here */
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2010-02-20 19:34:29 +00:00
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i += l;
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2010-07-09 15:19:12 +00:00
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for (; i < length; i ++){
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rtext[i] =
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2010-02-20 19:34:29 +00:00
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((user_data[(i * 7 + 7) >> 3] <<
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(7 - ((i * 7 + 7) & 7))) |
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(user_data[(i * 7) >> 3] >>
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((i * 7) & 7))) & 0x7f;
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2010-07-09 15:19:12 +00:00
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}
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for(i = 0; i < length; i++){
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/* this is an extension character */
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2010-07-19 18:54:54 +00:00
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if(rtext[i] == 0x1b && i + 1 < length){
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2010-07-09 15:19:12 +00:00
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tmp = rtext[i+1];
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*(text++) = gsm_7bit_alphabet[0x7f + tmp];
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i++;
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continue;
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}
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*(text++) = gsm_septet_lookup(rtext[i]);
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}
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2010-02-20 19:34:29 +00:00
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*text = '\0';
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2010-07-09 15:19:12 +00:00
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free(rtext);
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2010-02-20 19:34:29 +00:00
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2010-07-09 15:19:12 +00:00
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return i;
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2010-02-20 19:34:29 +00:00
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}
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2010-07-09 15:19:12 +00:00
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/* GSM 03.38 6.2.1 Prepare character packing */
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static int gsm_septet_encode(uint8_t *result, const char *data)
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{
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int i, y = 0;
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uint8_t ch;
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for(i = 0; i < strlen(data); i++){
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ch = data[i];
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switch(ch){
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/* fall-through for extension characters */
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case 0x0c:
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case 0x5e:
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case 0x7b:
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case 0x7d:
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case 0x5c:
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case 0x5b:
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case 0x7e:
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case 0x5d:
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case 0x7c:
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result[y++] = 0x1b;
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default:
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result[y] = gsm_7bit_alphabet[ch];
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break;
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}
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y++;
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}
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2010-02-20 19:34:29 +00:00
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2010-07-09 15:19:12 +00:00
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return y;
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}
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/* GSM 03.38 6.2.1 Character packing */
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2010-02-20 19:34:29 +00:00
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int gsm_7bit_encode(uint8_t *result, const char *data)
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{
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2010-07-09 15:19:12 +00:00
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int i,y,z = 0;
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/* prepare for the worst case, every character expanding to two bytes */
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uint8_t *rdata = calloc(strlen(data) * 2, sizeof(uint8_t));
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uint8_t cb, nb;
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2010-02-20 19:34:29 +00:00
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int shift = 0;
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2010-07-09 15:19:12 +00:00
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y = gsm_septet_encode(rdata, data);
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2010-02-20 19:34:29 +00:00
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2010-07-09 15:19:12 +00:00
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for(i = 0; i < y; i++) {
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if(shift == 7 && i + 1 < y){
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shift = 0;
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continue;
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}
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2010-02-20 19:34:29 +00:00
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2010-07-09 15:19:12 +00:00
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cb = (rdata[i] & 0x7f) >> shift;
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if(i + 1 < y){
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nb = (rdata[i + 1] & 0x7f) << (7 - shift);
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cb = cb | nb;
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}
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2010-02-20 19:34:29 +00:00
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2010-07-09 15:19:12 +00:00
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result[z++] = cb;
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2010-02-20 19:34:29 +00:00
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shift++;
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}
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2010-07-09 15:19:12 +00:00
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free(rdata);
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2010-02-20 19:34:29 +00:00
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return i;
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}
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/* determine power control level for given dBm value, as indicated
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* by the tables in chapter 4.1.1 of GSM TS 05.05 */
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int ms_pwr_ctl_lvl(enum gsm_band band, unsigned int dbm)
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{
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switch (band) {
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case GSM_BAND_450:
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case GSM_BAND_480:
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case GSM_BAND_750:
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case GSM_BAND_900:
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case GSM_BAND_810:
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case GSM_BAND_850:
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if (dbm >= 39)
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return 0;
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else if (dbm < 5)
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return 19;
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else {
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/* we are guaranteed to have (5 <= dbm < 39) */
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return 2 + ((39 - dbm) / 2);
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}
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break;
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case GSM_BAND_1800:
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if (dbm >= 36)
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return 29;
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else if (dbm >= 34)
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return 30;
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else if (dbm >= 32)
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return 31;
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else if (dbm == 31)
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return 0;
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else {
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/* we are guaranteed to have (0 <= dbm < 31) */
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return (30 - dbm) / 2;
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}
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break;
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case GSM_BAND_1900:
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if (dbm >= 33)
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return 30;
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else if (dbm >= 32)
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return 31;
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else if (dbm == 31)
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return 0;
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else {
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/* we are guaranteed to have (0 <= dbm < 31) */
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return (30 - dbm) / 2;
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}
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break;
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}
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return -EINVAL;
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}
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int ms_pwr_dbm(enum gsm_band band, uint8_t lvl)
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{
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lvl &= 0x1f;
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switch (band) {
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case GSM_BAND_450:
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case GSM_BAND_480:
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case GSM_BAND_750:
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case GSM_BAND_900:
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case GSM_BAND_810:
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case GSM_BAND_850:
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if (lvl < 2)
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return 39;
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else if (lvl < 20)
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return 39 - ((lvl - 2) * 2) ;
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else
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return 5;
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break;
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case GSM_BAND_1800:
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if (lvl < 16)
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return 30 - (lvl * 2);
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else if (lvl < 29)
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return 0;
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else
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return 36 - ((lvl - 29) * 2);
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break;
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case GSM_BAND_1900:
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if (lvl < 16)
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return 30 - (lvl * 2);
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else if (lvl < 30)
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return -EINVAL;
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else
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return 33 - (lvl - 30);
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break;
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}
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return -EINVAL;
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}
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/* According to TS 08.05 Chapter 8.1.4 */
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int rxlev2dbm(uint8_t rxlev)
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{
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if (rxlev > 63)
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rxlev = 63;
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return -110 + rxlev;
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}
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/* According to TS 08.05 Chapter 8.1.4 */
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uint8_t dbm2rxlev(int dbm)
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{
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int rxlev = dbm + 110;
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if (rxlev > 63)
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rxlev = 63;
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else if (rxlev < 0)
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rxlev = 0;
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return rxlev;
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}
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2010-03-22 00:28:44 +00:00
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const char *gsm_band_name(enum gsm_band band)
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2010-03-04 09:39:17 +00:00
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{
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switch (band) {
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case GSM_BAND_450:
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return "GSM450";
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case GSM_BAND_480:
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2010-07-04 09:41:36 +00:00
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return "GSM480";
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2010-03-04 09:39:17 +00:00
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case GSM_BAND_750:
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return "GSM750";
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case GSM_BAND_810:
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return "GSM810";
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case GSM_BAND_850:
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return "GSM850";
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case GSM_BAND_900:
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return "GSM900";
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case GSM_BAND_1800:
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return "DCS1800";
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case GSM_BAND_1900:
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return "PCS1900";
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}
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return "invalid";
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}
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enum gsm_band gsm_band_parse(const char* mhz)
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{
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while (*mhz && !isdigit(*mhz))
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mhz++;
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if (*mhz == '\0')
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return -EINVAL;
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2010-03-07 17:23:47 +00:00
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switch (strtol(mhz, NULL, 10)) {
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2010-03-04 09:39:17 +00:00
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case 450:
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return GSM_BAND_450;
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case 480:
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return GSM_BAND_480;
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case 750:
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return GSM_BAND_750;
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case 810:
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return GSM_BAND_810;
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case 850:
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return GSM_BAND_850;
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case 900:
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return GSM_BAND_900;
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case 1800:
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return GSM_BAND_1800;
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case 1900:
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return GSM_BAND_1900;
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default:
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return -EINVAL;
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}
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}
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2010-02-20 19:34:29 +00:00
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#ifdef HAVE_EXECINFO_H
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#include <execinfo.h>
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void generate_backtrace()
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{
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int i, nptrs;
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void *buffer[100];
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char **strings;
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nptrs = backtrace(buffer, ARRAY_SIZE(buffer));
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printf("backtrace() returned %d addresses\n", nptrs);
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strings = backtrace_symbols(buffer, nptrs);
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if (!strings)
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return;
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for (i = 1; i < nptrs; i++)
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printf("%s\n", strings[i]);
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free(strings);
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}
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#endif
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2010-03-07 16:50:21 +00:00
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enum gsm_band gsm_arfcn2band(uint16_t arfcn)
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{
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if (arfcn & ARFCN_PCS)
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return GSM_BAND_1900;
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else if (arfcn <= 124)
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return GSM_BAND_900;
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else if (arfcn >= 955 && arfcn <= 1023)
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return GSM_BAND_900;
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else if (arfcn >= 128 && arfcn <= 251)
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return GSM_BAND_850;
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else if (arfcn >= 512 && arfcn <= 885)
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return GSM_BAND_1800;
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else if (arfcn >= 259 && arfcn <= 293)
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return GSM_BAND_450;
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else if (arfcn >= 306 && arfcn <= 340)
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return GSM_BAND_480;
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else if (arfcn >= 350 && arfcn <= 425)
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return GSM_BAND_810;
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else if (arfcn >= 438 && arfcn <= 511)
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return GSM_BAND_750;
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else
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return GSM_BAND_1800;
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}
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/* Convert an ARFCN to the frequency in MHz * 10 */
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uint16_t gsm_arfcn2freq10(uint16_t arfcn, int uplink)
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{
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uint16_t freq10_ul;
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|
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));
|
|
|
|
}
|
2010-05-01 09:59:42 +00:00
|
|
|
|
|
|
|
/* 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;
|
|
|
|
}
|
2010-06-01 08:47:07 +00:00
|
|
|
|
|
|
|
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;
|
|
|
|
}
|