src/host/layer23/src/misc/cell_log.c

   1 /* Cell Scanning code for OsmocomBB */
   2
   3 /* (C) 2010 by Andreas Eversberg <jolly@eversberg.eu>
   4  *
   5  * All Rights Reserved
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  */
  22
  23 #include <stdio.h>
  24 #include <stdint.h>
  25 #include <string.h>
  26 #include <stdlib.h>
  27 #include <time.h>
  28 #include <errno.h>
  29
  30 #include <l1ctl_proto.h>
  31
  32 #include <osmocore/logging.h>
  33 #include <osmocore/timer.h>
  34 #include <osmocore/signal.h>
  35 #include <osmocore/msgb.h>
  36 #include <osmocore/gsm_utils.h>
  37 #include <osmocore/protocol/gsm_04_08.h>
  38 #include <osmocore/rsl.h>
  39
  40 #include <osmocom/bb/common/l1ctl.h>
  41 #include <osmocom/bb/common/osmocom_data.h>
  42 #include <osmocom/bb/common/lapdm.h>
  43 #include <osmocom/bb/common/logging.h>
  44 #include <osmocom/bb/common/networks.h>
  45 #include <osmocom/bb/common/gps.h>
  46 #include <osmocom/bb/misc/cell_log.h>
  47 #include "../../../gsmmap/geo.h"
  48
  49 #define READ_WAIT       2, 0
  50 #define RACH_MAX        2
  51 #define RACH_WAIT       0, 900000
  52 #define MIN_RXLEV       -106
  53 #define MAX_DIST        2000
  54
  55 enum {
  56         SCAN_STATE_PM,
  57         SCAN_STATE_SYNC,
  58         SCAN_STATE_READ,
  59         SCAN_STATE_RACH,
  60 };
  61
  62 /* ranges of bands */
  63 static uint16_t band_range[][2] = {{0, 124}, {512, 885}, {955, 1023}, {0, 0}};
  64
  65 #define INFO_FLG_PM     1
  66 #define INFO_FLG_SYNC   2
  67 #define INFO_FLG_SI1    4
  68 #define INFO_FLG_SI2    8
  69 #define INFO_FLG_SI2bis 16
  70 #define INFO_FLG_SI2ter 32
  71 #define INFO_FLG_SI3    64
  72 #define INFO_FLG_SI4    128
  73
  74 static struct osmocom_ms *ms;
  75 static struct timer_list timer;
  76
  77 static struct pm_info {
  78         uint16_t flags;
  79         int8_t rxlev;
  80 } pm[1024];
  81
  82 static int started = 0;
  83 static int state;
  84 static int8_t min_rxlev = MIN_RXLEV;
  85 static int sync_count;
  86 static int pm_index, pm_gps_valid;
  87 static double pm_gps_x, pm_gps_y, pm_gps_z;
  88 static int arfcn;
  89 static int rach_count;
  90 static FILE *logfp = NULL;
  91 static char *logname = "/var/log/osmocom.log";
  92
  93 static struct gsm48_sysinfo sysinfo;
  94
  95 static struct log_si {
  96         uint16_t flags;
  97         uint8_t bsic;
  98         int8_t rxlev;
  99         uint16_t mcc, mnc, lac, cellid;
 100         uint8_t ta;
 101         double latitude, longitude;
 102 } log_si;
 103
 104 struct rach_ref {
 105         uint8_t valid;
 106         uint8_t cr;
 107         uint8_t t1, t2, t3;
 108 } rach_ref;
 109
 110 #define LOGFILE(fmt, args...) \
 111         fprintf(logfp, fmt, ## args);
 112 #define LOGFLUSH() \
 113         fflush(logfp);
 114
 115 static void start_sync(void);
 116 static void start_rach(void);
 117 static void start_pm(void);
 118
 119 static void log_gps(void)
 120 {
 121         if (!gps.enable || !gps.valid)
 122                 return;
 123         LOGFILE("position %.8f %.8f\n", gps.longitude, gps.latitude);
 124 }
 125
 126 static void log_time(void)
 127 {
 128         time_t now;
 129
 130         if (gps.enable && gps.valid)
 131                 now = gps.gmt;
 132         else
 133                 time(&now);
 134         LOGFILE("time %lu\n", now);
 135 }
 136
 137 static void log_frame(char *tag, uint8_t *data)
 138 {
 139         int i;
 140
 141         LOGFILE("%s", tag);
 142         for (i = 0; i < 23; i++)
 143                 LOGFILE(" %02x", *data++);
 144         LOGFILE("\n");
 145 }
 146
 147 static void log_pm(void)
 148 {
 149         int count = 0, i;
 150
 151         LOGFILE("[power]\n");
 152         log_time();
 153         log_gps();
 154         for (i = 0; i <= 1023; i++) {
 155                 if ((pm[i].flags & INFO_FLG_PM)) {
 156                         if (!count)
 157                                 LOGFILE("arfcn %d", i);
 158                         LOGFILE(" %d", pm[i].rxlev);
 159                         count++;
 160                         if (count == 12) {
 161                                 LOGFILE("\n");
 162                                 count = 0;
 163                         }
 164                 } else {
 165                         if (count) {
 166                                 LOGFILE("\n");
 167                                 count = 0;
 168                         }
 169                 }
 170         }
 171         if (count)
 172                 LOGFILE("\n");
 173
 174         LOGFILE("\n");
 175         LOGFLUSH();
 176 }
 177
 178 static void log_sysinfo(void)
 179 {
 180         struct rx_meas_stat *meas = &ms->meas;
 181         struct gsm48_sysinfo *s = &sysinfo;
 182         int8_t rxlev;
 183         char ta_str[32] = "";
 184
 185         if (log_si.ta != 0xff)
 186                 sprintf(ta_str, " TA=%d", log_si.ta);
 187
 188         LOGP(DSUM, LOGL_INFO, "Cell: ARFCN=%d MCC=%s MNC=%s (%s, %s)%s\n",
 189                 arfcn, gsm_print_mcc(s->mcc), gsm_print_mnc(s->mnc),
 190                 gsm_get_mcc(s->mcc), gsm_get_mnc(s->mcc, s->mnc), ta_str);
 191
 192         LOGFILE("[sysinfo]\n");
 193         LOGFILE("arfcn %d\n", s->arfcn);
 194         log_time();
 195         log_gps();
 196         LOGFILE("bsic %d,%d\n", s->bsic >> 3, s->bsic & 7);
 197         rxlev = meas->rxlev / meas->frames - 110;
 198         LOGFILE("rxlev %d\n", rxlev);
 199         if (s->si1)
 200                 log_frame("si1", s->si1_msg);
 201         if (s->si2)
 202                 log_frame("si2", s->si2_msg);
 203         if (s->si2bis)
 204                 log_frame("si2bis", s->si2b_msg);
 205         if (s->si2ter)
 206                 log_frame("si2ter", s->si2t_msg);
 207         if (s->si3)
 208                 log_frame("si3", s->si3_msg);
 209         if (s->si4)
 210                 log_frame("si4", s->si4_msg);
 211         if (log_si.ta != 0xff)
 212                 LOGFILE("ta %d\n", log_si.ta);
 213
 214         LOGFILE("\n");
 215         LOGFLUSH();
 216 }
 217
 218 static void timeout_cb(void *arg)
 219 {
 220         switch (state) {
 221         case SCAN_STATE_READ:
 222                 LOGP(DRR, LOGL_INFO, "Timeout reading BCCH\n");
 223                 start_sync();
 224                 break;
 225         case SCAN_STATE_RACH:
 226                 LOGP(DRR, LOGL_INFO, "Timeout on RACH\n");
 227                 rach_count++;
 228                 start_rach();
 229                 break;
 230         }
 231 }
 232
 233 static void stop_timer(void)
 234 {
 235         if (bsc_timer_pending(&timer))
 236                 bsc_del_timer(&timer);
 237 }
 238
 239 static void start_timer(int sec, int micro)
 240 {
 241         stop_timer();
 242         timer.cb = timeout_cb;
 243         timer.data = ms;
 244         bsc_schedule_timer(&timer, sec, micro);
 245 }
 246
 247 static void start_rach(void)
 248 {
 249         struct gsm48_sysinfo *s = &sysinfo;
 250         uint8_t chan_req_val, chan_req_mask;
 251         struct msgb *nmsg;
 252         struct abis_rsl_cchan_hdr *ncch;
 253
 254         if (rach_count == RACH_MAX) {
 255                 log_sysinfo();
 256                 start_sync();
 257                 return;
 258         }
 259
 260         state = SCAN_STATE_RACH;
 261
 262         if (s->neci) {
 263                 chan_req_mask = 0x0f;
 264                 chan_req_val = 0x01;
 265                 LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x "
 266                         "(OTHER with NECI)\n", chan_req_val);
 267         } else {
 268                 chan_req_mask = 0x1f;
 269                 chan_req_val = 0xe0;
 270                 LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x (OTHER no NECI)\n",
 271                         chan_req_val);
 272         }
 273
 274         rach_ref.valid = 0;
 275         rach_ref.cr = random();
 276         rach_ref.cr &= chan_req_mask;
 277         rach_ref.cr |= chan_req_val;
 278
 279         nmsg = msgb_alloc_headroom(RSL_ALLOC_SIZE+RSL_ALLOC_HEADROOM,
 280                 RSL_ALLOC_HEADROOM, "GSM 04.06 RSL");
 281         if (!nmsg)
 282                 return;
 283         nmsg->l2h = nmsg->data;
 284         ncch = (struct abis_rsl_cchan_hdr *) msgb_put(nmsg, sizeof(*ncch)
 285                                                         + 4 + 2 + 2);
 286         rsl_init_cchan_hdr(ncch, RSL_MT_CHAN_RQD);
 287         ncch->chan_nr = RSL_CHAN_RACH;
 288         ncch->data[0] = RSL_IE_REQ_REFERENCE;
 289         ncch->data[1] = rach_ref.cr;
 290         ncch->data[2] = (s->ccch_conf == 1) << 7;
 291         ncch->data[3] = 0;
 292         ncch->data[4] = RSL_IE_ACCESS_DELAY;
 293         ncch->data[5] = 0; /* no delay */
 294         ncch->data[6] = RSL_IE_MS_POWER;
 295         ncch->data[7] = 0; /* full power */
 296
 297         start_timer(RACH_WAIT);
 298
 299         rslms_recvmsg(nmsg, ms);
 300 }
 301
 302 static void start_sync(void)
 303 {
 304         int rxlev = -128;
 305         int i, dist = 0;
 306         char dist_str[32] = "";
 307
 308         arfcn = 0xffff;
 309         for (i = 0; i <= 1023; i++) {
 310                 if ((pm[i].flags & INFO_FLG_PM)
 311                  && !(pm[i].flags & INFO_FLG_SYNC)) {
 312                         if (pm[i].rxlev > rxlev) {
 313                                 rxlev = pm[i].rxlev;
 314                                 arfcn = i;
 315                         }
 316                 }
 317         }
 318         if (pm_gps_valid && gps.valid) {
 319                 double x, y, z;
 320
 321                 geo2space(&x, &y, &z, gps.longitude, gps.latitude);
 322                 dist = distinspace(pm_gps_x, pm_gps_y, pm_gps_z, x, y, z);
 323                 sprintf(dist_str, "  dist %d", (int)dist);
 324         }
 325         if (dist > MAX_DIST || arfcn == 0xffff || rxlev < min_rxlev) {
 326                 memset(pm, 0, sizeof(pm));
 327                 pm_index = 0;
 328                 sync_count = 0;
 329                 start_pm();
 330                 return;
 331         }
 332         pm[arfcn].flags |= INFO_FLG_SYNC;
 333         LOGP(DSUM, LOGL_INFO, "Sync ARFCN %d (rxlev %d, %d syncs "
 334                 "left)%s\n", arfcn, pm[arfcn].rxlev, sync_count--, dist_str);
 335         memset(&sysinfo, 0, sizeof(sysinfo));
 336         sysinfo.arfcn = arfcn;
 337         state = SCAN_STATE_SYNC;
 338         l1ctl_tx_reset_req(ms, L1CTL_RES_T_FULL);
 339         l1ctl_tx_fbsb_req(ms, arfcn, L1CTL_FBSB_F_FB01SB, 100, 0,
 340                 CCCH_MODE_NONE);
 341 }
 342
 343 static void start_pm(void)
 344 {
 345         uint16_t from, to;
 346
 347         state = SCAN_STATE_PM;
 348         from = band_range[pm_index][0];
 349         to = band_range[pm_index][1];
 350
 351         if (from == 0 && to == 0) {
 352                 LOGP(DSUM, LOGL_INFO, "Measurement done\n");
 353                 pm_gps_valid = gps.enable && gps.valid;
 354                 if (pm_gps_valid)
 355                         geo2space(&pm_gps_x, &pm_gps_y, &pm_gps_z,
 356                                 gps.longitude, gps.latitude);
 357                 log_pm();
 358                 start_sync();
 359                 return;
 360         }
 361         LOGP(DSUM, LOGL_INFO, "Measure from %d to %d\n", from, to);
 362         l1ctl_tx_reset_req(ms, L1CTL_RES_T_FULL);
 363         l1ctl_tx_pm_req_range(ms, from, to);
 364 }
 365
 366 static int signal_cb(unsigned int subsys, unsigned int signal,
 367                      void *handler_data, void *signal_data)
 368 {
 369         struct osmobb_meas_res *mr;
 370         struct osmobb_fbsb_res *fr;
 371         uint16_t index;
 372
 373         if (subsys != SS_L1CTL)
 374                 return 0;
 375
 376         switch (signal) {
 377         case S_L1CTL_PM_RES:
 378                 mr = signal_data;
 379                 index = mr->band_arfcn & 0x3ff;
 380                 pm[index].flags |= INFO_FLG_PM;
 381                 pm[index].rxlev = mr->rx_lev - 110;
 382                 if (pm[index].rxlev >= min_rxlev)
 383                         sync_count++;
 384 //              printf("rxlev %d = %d (sync_count %d)\n", index, pm[index].rxlev, sync_count);
 385                 break;
 386         case S_L1CTL_PM_DONE:
 387                 pm_index++;
 388                 start_pm();
 389                 break;
 390         case S_L1CTL_FBSB_RESP:
 391                 fr = signal_data;
 392                 sysinfo.bsic = fr->bsic;
 393                 state = SCAN_STATE_READ;
 394                 memset(&ms->meas, 0, sizeof(ms->meas));
 395                 memset(&log_si, 0, sizeof(log_si));
 396                 log_si.flags |= INFO_FLG_SYNC;
 397                 log_si.ta = 0xff; /* invalid */
 398                 start_timer(READ_WAIT);
 399                 LOGP(DRR, LOGL_INFO, "Synchronized, start reading\n");
 400                 break;
 401         case S_L1CTL_FBSB_ERR:
 402                 LOGP(DRR, LOGL_INFO, "Sync failed\n");
 403                 start_sync();
 404                 break;
 405         case S_L1CTL_RESET:
 406                 if (started)
 407                         break;
 408                 started = 1;
 409                 memset(pm, 0, sizeof(pm));
 410                 pm_index = 0;
 411                 sync_count = 0;
 412                 start_pm();
 413         }
 414         return 0;
 415 }
 416
 417 static int ta_result(uint8_t ta)
 418 {
 419         stop_timer();
 420
 421         if (ta == 0xff)
 422                 LOGP(DSUM, LOGL_INFO, "Got assignment reject\n");
 423         else {
 424                 LOGP(DSUM, LOGL_DEBUG, "Got assignment TA = %d\n", ta);
 425                 log_si.ta = ta;
 426         }
 427
 428         log_sysinfo();
 429         start_sync();
 430
 431         return 0;
 432 }
 433
 434 /* match request reference agains request */
 435 static int match_ra(struct osmocom_ms *ms, struct gsm48_req_ref *ref)
 436 {
 437         uint8_t ia_t1, ia_t2, ia_t3;
 438
 439         /* filter confirmed RACH requests only */
 440         if (rach_ref.valid && ref->ra == rach_ref.cr) {
 441                 ia_t1 = ref->t1;
 442                 ia_t2 = ref->t2;
 443                 ia_t3 = (ref->t3_high << 3) | ref->t3_low;
 444                 if (ia_t1 == rach_ref.t1 && ia_t2 == rach_ref.t2
 445                          && ia_t3 == rach_ref.t3) {
 446                         LOGP(DRR, LOGL_INFO, "request %02x matches "
 447                                 "(fn=%d,%d,%d)\n", ref->ra, ia_t1, ia_t2,
 448                                         ia_t3);
 449                         return 1;
 450                 } else
 451                         LOGP(DRR, LOGL_INFO, "request %02x matches but not "
 452                                 "frame number (IMM.ASS fn=%d,%d,%d != RACH "
 453                                 "fn=%d,%d,%d)\n", ref->ra, ia_t1, ia_t2, ia_t3,
 454                                 rach_ref.t1, rach_ref.t2, rach_ref.t3);
 455         }
 456
 457         return 0;
 458 }
 459
 460 /* 9.1.18 IMMEDIATE ASSIGNMENT is received */
 461 static int imm_ass(struct osmocom_ms *ms, struct msgb *msg)
 462 {
 463         struct gsm48_imm_ass *ia = msgb_l3(msg);
 464
 465         LOGP(DRR, LOGL_INFO, "IMMEDIATE ASSIGNMENT:\n");
 466
 467         if (state != SCAN_STATE_RACH) {
 468                 LOGP(DRR, LOGL_INFO, "Not for us, no request.\n");
 469                 return 0;
 470         }
 471
 472         /* request ref */
 473         if (match_ra(ms, &ia->req_ref)) {
 474                 return ta_result(ia->timing_advance);
 475         }
 476         LOGP(DRR, LOGL_INFO, "Request, but not for us.\n");
 477
 478         return 0;
 479 }
 480
 481 /* 9.1.19 IMMEDIATE ASSIGNMENT EXTENDED is received */
 482 static int imm_ass_ext(struct osmocom_ms *ms, struct msgb *msg)
 483 {
 484         struct gsm48_imm_ass_ext *ia = msgb_l3(msg);
 485
 486         LOGP(DRR, LOGL_INFO, "IMMEDIATE ASSIGNMENT EXTENDED:\n");
 487
 488         if (state != SCAN_STATE_RACH) {
 489                 LOGP(DRR, LOGL_INFO, "Not for us, no request.\n");
 490                 return 0;
 491         }
 492
 493         /* request ref 1 */
 494         if (match_ra(ms, &ia->req_ref1)) {
 495                 return ta_result(ia->timing_advance1);
 496         }
 497         /* request ref 2 */
 498         if (match_ra(ms, &ia->req_ref2)) {
 499                 return ta_result(ia->timing_advance2);
 500         }
 501         LOGP(DRR, LOGL_INFO, "Request, but not for us.\n");
 502
 503         return 0;
 504 }
 505
 506 /* 9.1.20 IMMEDIATE ASSIGNMENT REJECT is received */
 507 static int imm_ass_rej(struct osmocom_ms *ms, struct msgb *msg)
 508 {
 509         struct gsm48_imm_ass_rej *ia = msgb_l3(msg);
 510         int i;
 511         struct gsm48_req_ref *req_ref;
 512
 513         LOGP(DRR, LOGL_INFO, "IMMEDIATE ASSIGNMENT REJECT:\n");
 514
 515         if (state != SCAN_STATE_RACH) {
 516                 LOGP(DRR, LOGL_INFO, "Not for us, no request.\n");
 517                 return 0;
 518         }
 519
 520         for (i = 0; i < 4; i++) {
 521                 /* request reference */
 522                 req_ref = (struct gsm48_req_ref *)
 523                                 (((uint8_t *)&ia->req_ref1) + i * 4);
 524                 LOGP(DRR, LOGL_INFO, "IMMEDIATE ASSIGNMENT REJECT "
 525                         "(ref 0x%02x)\n", req_ref->ra);
 526                 if (match_ra(ms, req_ref)) {
 527                         return ta_result(0xff);
 528                 }
 529         }
 530
 531         return 0;
 532 }
 533
 534 /* receive CCCH at RR layer */
 535 static int pch_agch(struct osmocom_ms *ms, struct msgb *msg)
 536 {
 537         struct gsm48_system_information_type_header *sih = msgb_l3(msg);
 538
 539         switch (sih->system_information) {
 540         case GSM48_MT_RR_PAG_REQ_1:
 541         case GSM48_MT_RR_PAG_REQ_2:
 542         case GSM48_MT_RR_PAG_REQ_3:
 543                 return 0;
 544         case GSM48_MT_RR_IMM_ASS:
 545                 return imm_ass(ms, msg);
 546         case GSM48_MT_RR_IMM_ASS_EXT:
 547                 return imm_ass_ext(ms, msg);
 548         case GSM48_MT_RR_IMM_ASS_REJ:
 549                 return imm_ass_rej(ms, msg);
 550         default:
 551                 return -EINVAL;
 552         }
 553 }
 554
 555 /* check if sysinfo is complete, change to RACH state */
 556 static int new_sysinfo(void)
 557 {
 558         struct gsm48_sysinfo *s = &sysinfo;
 559
 560         /* restart timer */
 561         start_timer(READ_WAIT);
 562
 563         /* mandatory */
 564         if (!s->si1 || !s->si2 || !s->si3 || !s->si4) {
 565                 LOGP(DRR, LOGL_INFO, "not all mandatory SI received\n");
 566                 return 0;
 567         }
 568
 569         /* extended band */
 570         if (s->nb_ext_ind_si2 && !s->si2bis) {
 571                 LOGP(DRR, LOGL_INFO, "extended ba, but si2bis not received\n");
 572                 return 0;
 573         }
 574
 575         /* 2ter */
 576         if (s->si2ter_ind && !s->si2ter) {
 577                 LOGP(DRR, LOGL_INFO, "si2ter_ind, but si2ter not received\n");
 578                 return 0;
 579         }
 580
 581         LOGP(DRR, LOGL_INFO, "Sysinfo complete\n");
 582
 583         stop_timer();
 584
 585         rach_count = 0;
 586         start_rach();
 587
 588         return 0;
 589 }
 590
 591 /* receive BCCH at RR layer */
 592 static int bcch(struct osmocom_ms *ms, struct msgb *msg)
 593 {
 594         struct gsm48_sysinfo *s = &sysinfo;
 595         struct gsm48_system_information_type_header *sih = msgb_l3(msg);
 596         uint8_t ccch_mode;
 597
 598         if (msgb_l3len(msg) != 23) {
 599                 LOGP(DRR, LOGL_NOTICE, "Invalid BCCH message length\n");
 600                 return -EINVAL;
 601         }
 602         switch (sih->system_information) {
 603         case GSM48_MT_RR_SYSINFO_1:
 604                 if (!memcmp(sih, s->si1_msg, sizeof(s->si1_msg)))
 605                         return 0;
 606                 LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 1\n");
 607                 gsm48_decode_sysinfo1(s,
 608                         (struct gsm48_system_information_type_1 *) sih,
 609                         msgb_l3len(msg));
 610                 return new_sysinfo();
 611         case GSM48_MT_RR_SYSINFO_2:
 612                 if (!memcmp(sih, s->si2_msg, sizeof(s->si2_msg)))
 613                         return 0;
 614                 LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 2\n");
 615                 gsm48_decode_sysinfo2(s,
 616                         (struct gsm48_system_information_type_2 *) sih,
 617                         msgb_l3len(msg));
 618                 return new_sysinfo();
 619         case GSM48_MT_RR_SYSINFO_2bis:
 620                 if (!memcmp(sih, s->si2b_msg, sizeof(s->si2b_msg)))
 621                         return 0;
 622                 LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 2bis\n");
 623                 gsm48_decode_sysinfo2bis(s,
 624                         (struct gsm48_system_information_type_2bis *) sih,
 625                         msgb_l3len(msg));
 626                 return new_sysinfo();
 627         case GSM48_MT_RR_SYSINFO_2ter:
 628                 if (!memcmp(sih, s->si2t_msg, sizeof(s->si2t_msg)))
 629                         return 0;
 630                 LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 2ter\n");
 631                 gsm48_decode_sysinfo2ter(s,
 632                         (struct gsm48_system_information_type_2ter *) sih,
 633                         msgb_l3len(msg));
 634                 return new_sysinfo();
 635         case GSM48_MT_RR_SYSINFO_3:
 636                 if (!memcmp(sih, s->si3_msg, sizeof(s->si3_msg)))
 637                         return 0;
 638                 LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 3\n");
 639                 gsm48_decode_sysinfo3(s,
 640                         (struct gsm48_system_information_type_3 *) sih,
 641                         msgb_l3len(msg));
 642                 ccch_mode = (s->ccch_conf == 1) ? CCCH_MODE_COMBINED :
 643                         CCCH_MODE_NON_COMBINED;
 644                 LOGP(DRR, LOGL_INFO, "Changing CCCH_MODE to %d\n", ccch_mode);
 645                 l1ctl_tx_ccch_mode_req(ms, ccch_mode);
 646                 return new_sysinfo();
 647         case GSM48_MT_RR_SYSINFO_4:
 648                 if (!memcmp(sih, s->si4_msg, sizeof(s->si4_msg)))
 649                         return 0;
 650                 LOGP(DRR, LOGL_INFO, "New SYSTEM INFORMATION 4\n");
 651                 gsm48_decode_sysinfo4(s,
 652                         (struct gsm48_system_information_type_4 *) sih,
 653                         msgb_l3len(msg));
 654                 return new_sysinfo();
 655         default:
 656                 return -EINVAL;
 657         }
 658 }
 659
 660 static int unit_data_ind(struct osmocom_ms *ms, struct msgb *msg)
 661 {
 662         struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
 663         struct tlv_parsed tv;
 664         uint8_t ch_type, ch_subch, ch_ts;
 665
 666         DEBUGP(DRSL, "RSLms UNIT DATA IND chan_nr=0x%02x link_id=0x%02x\n",
 667                 rllh->chan_nr, rllh->link_id);
 668
 669         rsl_tlv_parse(&tv, rllh->data, msgb_l2len(msg)-sizeof(*rllh));
 670         if (!TLVP_PRESENT(&tv, RSL_IE_L3_INFO)) {
 671                 DEBUGP(DRSL, "UNIT_DATA_IND without L3 INFO ?!?\n");
 672                 return -EIO;
 673         }
 674         msg->l3h = (uint8_t *) TLVP_VAL(&tv, RSL_IE_L3_INFO);
 675
 676         if (state != SCAN_STATE_READ && state != SCAN_STATE_RACH) {
 677                 return -EINVAL;
 678         }
 679
 680         rsl_dec_chan_nr(rllh->chan_nr, &ch_type, &ch_subch, &ch_ts);
 681         switch (ch_type) {
 682         case RSL_CHAN_PCH_AGCH:
 683                 return pch_agch(ms, msg);
 684         case RSL_CHAN_BCCH:
 685                 return bcch(ms, msg);
 686 #if 0
 687         case RSL_CHAN_Bm_ACCHs:
 688         case RSL_CHAN_Lm_ACCHs:
 689         case RSL_CHAN_SDCCH4_ACCH:
 690         case RSL_CHAN_SDCCH8_ACCH:
 691                 return rx_acch(ms, msg);
 692 #endif
 693         default:
 694                 LOGP(DRSL, LOGL_NOTICE, "RSL with chan_nr 0x%02x unknown.\n",
 695                         rllh->chan_nr);
 696                 return -EINVAL;
 697         }
 698 }
 699
 700 static int rcv_rll(struct osmocom_ms *ms, struct msgb *msg)
 701 {
 702         struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
 703         int msg_type = rllh->c.msg_type;
 704
 705         if (msg_type == RSL_MT_UNIT_DATA_IND) {
 706                 unit_data_ind(ms, msg);
 707         } else
 708                 LOGP(DRSL, LOGL_NOTICE, "RSLms message unhandled\n");
 709
 710         msgb_free(msg);
 711
 712         return 0;
 713 }
 714
 715 int chan_conf(struct osmocom_ms *ms, struct msgb *msg)
 716 {
 717         struct abis_rsl_cchan_hdr *ch = msgb_l2(msg);
 718         struct gsm48_req_ref *ref = (struct gsm48_req_ref *) (ch->data + 1);
 719
 720         if (msgb_l2len(msg) < sizeof(*ch) + sizeof(*ref)) {
 721                 LOGP(DRR, LOGL_ERROR, "CHAN_CNF too slort\n");
 722                 return -EINVAL;
 723         }
 724
 725         rach_ref.valid = 1;
 726         rach_ref.t1 = ref->t1;
 727         rach_ref.t2 = ref->t2;
 728         rach_ref.t3 = ref->t3_low | (ref->t3_high << 3);
 729
 730         return 0;
 731 }
 732
 733 static int rcv_cch(struct osmocom_ms *ms, struct msgb *msg)
 734 {
 735         struct abis_rsl_cchan_hdr *ch = msgb_l2(msg);
 736         int msg_type = ch->c.msg_type;
 737         int rc;
 738
 739         LOGP(DRSL, LOGL_INFO, "Received '%s' from layer1\n",
 740                 get_rsl_name(msg_type));
 741
 742         if (state == SCAN_STATE_RACH && msg_type == RSL_MT_CHAN_CONF) {
 743                 rc = chan_conf(ms, msg);
 744                 msgb_free(msg);
 745                 return rc;
 746         }
 747
 748         LOGP(DRSL, LOGL_NOTICE, "RSLms message unhandled\n");
 749         msgb_free(msg);
 750         return 0;
 751 }
 752
 753 static int rcv_rsl(struct msgb *msg, struct osmocom_ms *ms)
 754 {
 755         struct abis_rsl_common_hdr *rslh = msgb_l2(msg);
 756         int rc = 0;
 757
 758         switch (rslh->msg_discr & 0xfe) {
 759         case ABIS_RSL_MDISC_RLL:
 760                 rc = rcv_rll(ms, msg);
 761                 break;
 762         case ABIS_RSL_MDISC_COM_CHAN:
 763                 rc = rcv_cch(ms, msg);
 764                 break;
 765         default:
 766                 LOGP(DRSL, LOGL_NOTICE, "unknown RSLms msg_discr 0x%02x\n",
 767                         rslh->msg_discr);
 768                 msgb_free(msg);
 769                 rc = -EINVAL;
 770                 break;
 771         }
 772
 773         return rc;
 774 }
 775
 776 int scan_init(struct osmocom_ms *_ms)
 777 {
 778         ms = _ms;
 779         register_signal_handler(SS_L1CTL, &signal_cb, NULL);
 780         memset(&timer, 0, sizeof(timer));
 781         osmol2_register_handler(ms, &rcv_rsl);
 782         gps.enable = 1;
 783         gps_init();
 784         if (gps_open())
 785                 gps.enable = 0;
 786
 787         if (!strcmp(logname, "-"))
 788                 logfp = stdout;
 789         else
 790                 logfp = fopen(logname, "a");
 791         if (!logfp) {
 792                 fprintf(stderr, "Failed to open logfile '%s'\n", logname);
 793                 scan_exit();
 794                 return -errno;
 795         }
 796         LOGP(DSUM, LOGL_INFO, "Scanner initialized\n");
 797
 798         return 0;
 799 }
 800
 801 int scan_exit(void)
 802 {
 803         LOGP(DSUM, LOGL_INFO, "Scanner exit\n");
 804         if (gps.valid)
 805                 gps_close();
 806         if (logfp)
 807                 fclose(logfp);
 808         unregister_signal_handler(SS_L1CTL, &signal_cb, NULL);
 809         stop_timer();
 810
 811         return 0;
 812 }