src/host/layer23/src/common/l1ctl.c

   1 /* Layer1 control code, talking L1CTL protocol with L1 on the phone */
   2
   3 /* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
   4  * (C) 2010 by Harald Welte <laforge@gnumonks.org>
   5  *
   6  * All Rights Reserved
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  *
  22  */
  23
  24 #include <stdio.h>
  25 #include <stdint.h>
  26 #include <string.h>
  27 #include <errno.h>
  28
  29 #include <arpa/inet.h>
  30
  31 #include <l1ctl_proto.h>
  32
  33 #include <osmocore/signal.h>
  34 #include <osmocore/logging.h>
  35 #include <osmocore/timer.h>
  36 #include <osmocore/msgb.h>
  37 #include <osmocore/tlv.h>
  38 #include <osmocore/gsm_utils.h>
  39 #include <osmocore/gsmtap_util.h>
  40 #include <osmocore/protocol/gsm_04_08.h>
  41 #include <osmocore/protocol/gsm_08_58.h>
  42 #include <osmocore/rsl.h>
  43
  44 #include <osmocom/bb/common/l1ctl.h>
  45 #include <osmocom/bb/common/osmocom_data.h>
  46 #include <osmocom/bb/common/l1l2_interface.h>
  47 #include <osmocom/bb/common/lapdm.h>
  48 #include <osmocom/bb/common/logging.h>
  49
  50 static struct msgb *osmo_l1_alloc(uint8_t msg_type)
  51 {
  52         struct l1ctl_hdr *l1h;
  53         struct msgb *msg = msgb_alloc_headroom(256, 4, "osmo_l1");
  54
  55         if (!msg) {
  56                 LOGP(DL1C, LOGL_ERROR, "Failed to allocate memory.\n");
  57                 return NULL;
  58         }
  59
  60         msg->l1h = msgb_put(msg, sizeof(*l1h));
  61         l1h = (struct l1ctl_hdr *) msg->l1h;
  62         l1h->msg_type = msg_type;
  63
  64         return msg;
  65 }
  66
  67
  68 static int osmo_make_band_arfcn(struct osmocom_ms *ms, uint16_t arfcn)
  69 {
  70         /* TODO: Include the band */
  71         return arfcn;
  72 }
  73
  74 static int rx_l1_fbsb_conf(struct osmocom_ms *ms, struct msgb *msg)
  75 {
  76         struct l1ctl_info_dl *dl;
  77         struct l1ctl_fbsb_conf *sb;
  78         struct gsm_time tm;
  79         struct osmobb_fbsb_res fr;
  80
  81         if (msgb_l3len(msg) < sizeof(*dl) + sizeof(*sb)) {
  82                 LOGP(DL1C, LOGL_ERROR, "FBSB RESP: MSG too short %u\n",
  83                         msgb_l3len(msg));
  84                 return -1;
  85         }
  86
  87         dl = (struct l1ctl_info_dl *) msg->l1h;
  88         sb = (struct l1ctl_fbsb_conf *) dl->payload;
  89
  90         LOGP(DL1C, LOGL_INFO, "snr=%04x, arfcn=%u result=%u\n", dl->snr,
  91                 ntohs(dl->band_arfcn), sb->result);
  92
  93         if (sb->result != 0) {
  94                 LOGP(DL1C, LOGL_ERROR, "FBSB RESP: result=%u\n", sb->result);
  95                 dispatch_signal(SS_L1CTL, S_L1CTL_FBSB_ERR, ms);
  96                 return 0;
  97         }
  98
  99         gsm_fn2gsmtime(&tm, ntohl(dl->frame_nr));
 100         DEBUGP(DL1C, "SCH: SNR: %u TDMA: (%.4u/%.2u/%.2u) bsic: %d\n",
 101                 dl->snr, tm.t1, tm.t2, tm.t3, sb->bsic);
 102         fr.ms = ms;
 103         fr.snr = dl->snr;
 104         fr.bsic = sb->bsic;
 105         dispatch_signal(SS_L1CTL, S_L1CTL_FBSB_RESP, &fr);
 106
 107         return 0;
 108 }
 109
 110 static int rx_l1_rach_conf(struct osmocom_ms *ms, struct msgb *msg)
 111 {
 112         struct l1ctl_info_dl *dl;
 113
 114         if (msgb_l2len(msg) < sizeof(*dl)) {
 115                 LOGP(DL1C, LOGL_ERROR, "RACH CONF: MSG too short %u\n",
 116                         msgb_l3len(msg));
 117                 msgb_free(msg);
 118                 return -1;
 119         }
 120
 121         dl = (struct l1ctl_info_dl *) msg->l1h;
 122
 123         l2_ph_chan_conf(msg, ms, dl);
 124
 125         return 0;
 126 }
 127
 128 /* Receive L1CTL_DATA_IND (Data Indication from L1) */
 129 static int rx_ph_data_ind(struct osmocom_ms *ms, struct msgb *msg)
 130 {
 131         struct l1ctl_info_dl *dl, dl_cpy;
 132         struct l1ctl_data_ind *ccch;
 133         struct lapdm_entity *le;
 134         struct rx_meas_stat *meas = &ms->meas;
 135         uint8_t chan_type, chan_ts, chan_ss;
 136         uint8_t gsmtap_chan_type;
 137         struct gsm_time tm;
 138
 139         if (msgb_l3len(msg) < sizeof(*ccch)) {
 140                 LOGP(DL1C, LOGL_ERROR, "MSG too short Data Ind: %u\n",
 141                         msgb_l3len(msg));
 142                 msgb_free(msg);
 143                 return -1;
 144         }
 145
 146         dl = (struct l1ctl_info_dl *) msg->l1h;
 147         msg->l2h = dl->payload;
 148         ccch = (struct l1ctl_data_ind *) msg->l2h;
 149
 150         gsm_fn2gsmtime(&tm, ntohl(dl->frame_nr));
 151         rsl_dec_chan_nr(dl->chan_nr, &chan_type, &chan_ss, &chan_ts);
 152         DEBUGP(DL1C, "%s (%.4u/%.2u/%.2u) %d dBm: %s\n",
 153                 rsl_chan_nr_str(dl->chan_nr), tm.t1, tm.t2, tm.t3,
 154                 (int)dl->rx_level-110,
 155                 hexdump(ccch->data, sizeof(ccch->data)));
 156
 157         meas->last_fn = ntohl(dl->frame_nr);
 158         meas->frames++;
 159         meas->snr += dl->snr;
 160         meas->berr += dl->num_biterr;
 161         meas->rxlev += dl->rx_level;
 162
 163         if (dl->num_biterr) {
 164 printf("Dropping frame with %u bit errors\n", dl->num_biterr);
 165                 LOGP(DL1C, LOGL_NOTICE, "Dropping frame with %u bit errors\n",
 166                         dl->num_biterr);
 167                 return 0;
 168         }
 169
 170         /* send CCCH data via GSMTAP */
 171         gsmtap_chan_type = chantype_rsl2gsmtap(chan_type, dl->link_id);
 172         gsmtap_sendmsg(ntohs(dl->band_arfcn), chan_ts, gsmtap_chan_type, chan_ss,
 173                         tm.fn, dl->rx_level-110, dl->snr, ccch->data,
 174                         sizeof(ccch->data));
 175
 176         /* determine LAPDm entity based on SACCH or not */
 177         if (dl->link_id & 0x40)
 178                 le = &ms->l2_entity.lapdm_acch;
 179         else
 180                 le = &ms->l2_entity.lapdm_dcch;
 181         /* make local stack copy of l1ctl_info_dl, as LAPDm will
 182          * overwrite skb hdr */
 183         memcpy(&dl_cpy, dl, sizeof(dl_cpy));
 184
 185         /* pull the L1 header from the msgb */
 186         msgb_pull(msg, msg->l2h - (msg->l1h-sizeof(struct l1ctl_hdr)));
 187         msg->l1h = NULL;
 188
 189         /* send it up into LAPDm */
 190         l2_ph_data_ind(msg, le, &dl_cpy);
 191
 192         return 0;
 193 }
 194
 195 /* Receive L1CTL_DATA_CONF (Data Confirm from L1) */
 196 static int rx_ph_data_conf(struct osmocom_ms *ms, struct msgb *msg)
 197 {
 198         struct l1ctl_info_dl *dl;
 199         struct lapdm_entity *le;
 200
 201         dl = (struct l1ctl_info_dl *) msg->l1h;
 202
 203         /* determine LAPDm entity based on SACCH or not */
 204         if (dl->link_id & 0x40)
 205                 le = &ms->l2_entity.lapdm_acch;
 206         else
 207                 le = &ms->l2_entity.lapdm_dcch;
 208
 209         /* send it up into LAPDm */
 210         l2_ph_data_conf(msg, le);
 211
 212         return 0;
 213 }
 214
 215 /* Transmit L1CTL_DATA_REQ */
 216 int l1ctl_tx_data_req(struct osmocom_ms *ms, struct msgb *msg,
 217                       uint8_t chan_nr, uint8_t link_id)
 218 {
 219         struct l1ctl_hdr *l1h;
 220         struct l1ctl_info_ul *l1i_ul;
 221         uint8_t chan_type, chan_ts, chan_ss;
 222         uint8_t gsmtap_chan_type;
 223
 224         DEBUGP(DL1C, "(%s)\n", hexdump(msg->l2h, msgb_l2len(msg)));
 225
 226         if (msgb_l2len(msg) > 23) {
 227                 LOGP(DL1C, LOGL_ERROR, "L1 cannot handle message length "
 228                         "> 23 (%u)\n", msgb_l2len(msg));
 229                 msgb_free(msg);
 230                 return -EINVAL;
 231         } else if (msgb_l2len(msg) < 23)
 232                 LOGP(DL1C, LOGL_ERROR, "L1 message length < 23 (%u) "
 233                         "doesn't seem right!\n", msgb_l2len(msg));
 234
 235         /* send copy via GSMTAP */
 236         rsl_dec_chan_nr(chan_nr, &chan_type, &chan_ss, &chan_ts);
 237         gsmtap_chan_type = chantype_rsl2gsmtap(chan_type, link_id);
 238         gsmtap_sendmsg(0|0x4000, chan_ts, gsmtap_chan_type, chan_ss,
 239                         0, 127, 255, msg->l2h, msgb_l2len(msg));
 240
 241         /* prepend uplink info header */
 242         l1i_ul = (struct l1ctl_info_ul *) msgb_push(msg, sizeof(*l1i_ul));
 243
 244         l1i_ul->chan_nr = chan_nr;
 245         l1i_ul->link_id = link_id;
 246
 247         /* prepend l1 header */
 248         msg->l1h = msgb_push(msg, sizeof(*l1h));
 249         l1h = (struct l1ctl_hdr *) msg->l1h;
 250         l1h->msg_type = L1CTL_DATA_REQ;
 251
 252         return osmo_send_l1(ms, msg);
 253 }
 254
 255 /* Transmit FBSB_REQ */
 256 int l1ctl_tx_fbsb_req(struct osmocom_ms *ms, uint16_t arfcn,
 257                       uint8_t flags, uint16_t timeout, uint8_t sync_info_idx,
 258                       uint8_t ccch_mode)
 259 {
 260         struct msgb *msg;
 261         struct l1ctl_fbsb_req *req;
 262
 263         LOGP(DL1C, LOGL_INFO, "Sync Req\n");
 264
 265         msg = osmo_l1_alloc(L1CTL_FBSB_REQ);
 266         if (!msg)
 267                 return -1;
 268
 269         memset(&ms->meas, 0, sizeof(ms->meas));
 270
 271         req = (struct l1ctl_fbsb_req *) msgb_put(msg, sizeof(*req));
 272         req->band_arfcn = htons(osmo_make_band_arfcn(ms, arfcn));
 273         req->timeout = htons(timeout);
 274         /* Threshold when to consider FB_MODE1: 4kHz - 1kHz */
 275         req->freq_err_thresh1 = htons(4000 - 1000);
 276         /* Threshold when to consider SCH: 1kHz - 200Hz */
 277         req->freq_err_thresh2 = htons(1000 - 200);
 278         /* not used yet! */
 279         req->num_freqerr_avg = 3;
 280         req->flags = flags;
 281         req->sync_info_idx = sync_info_idx;
 282         req->ccch_mode = ccch_mode;
 283
 284         return osmo_send_l1(ms, msg);
 285 }
 286
 287 /* Transmit L1CTL_CCCH_MODE_REQ */
 288 int l1ctl_tx_ccch_mode_req(struct osmocom_ms *ms, uint8_t ccch_mode)
 289 {
 290         struct msgb *msg;
 291         struct l1ctl_ccch_mode_req *req;
 292
 293         LOGP(DL1C, LOGL_INFO, "CCCH Mode Req\n");
 294
 295         msg = osmo_l1_alloc(L1CTL_CCCH_MODE_REQ);
 296         if (!msg)
 297                 return -1;
 298
 299         req = (struct l1ctl_ccch_mode_req *) msgb_put(msg, sizeof(*req));
 300         req->ccch_mode = ccch_mode;
 301
 302         return osmo_send_l1(ms, msg);
 303 }
 304
 305 /* Transmit L1CTL_TCH_MODE_REQ */
 306 int l1ctl_tx_tch_mode_req(struct osmocom_ms *ms, uint8_t tch_mode)
 307 {
 308         struct msgb *msg;
 309         struct l1ctl_tch_mode_req *req;
 310
 311         LOGP(DL1C, LOGL_INFO, "TCH Mode Req\n");
 312
 313         msg = osmo_l1_alloc(L1CTL_TCH_MODE_REQ);
 314         if (!msg)
 315                 return -1;
 316
 317         req = (struct l1ctl_tch_mode_req *) msgb_put(msg, sizeof(*req));
 318         req->tch_mode = tch_mode;
 319
 320         return osmo_send_l1(ms, msg);
 321 }
 322
 323 /* Transmit L1CTL_PARAM_REQ */
 324 int l1ctl_tx_param_req(struct osmocom_ms *ms, uint8_t ta, uint8_t tx_power)
 325 {
 326         struct msgb *msg;
 327         struct l1ctl_info_ul *ul;
 328         struct l1ctl_par_req *req;
 329
 330         msg = osmo_l1_alloc(L1CTL_PARAM_REQ);
 331         if (!msg)
 332                 return -1;
 333
 334         DEBUGP(DL1C, "PARAM Req. ta=%d, tx_power=%d\n", ta, tx_power);
 335         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 336         req = (struct l1ctl_par_req *) msgb_put(msg, sizeof(*req));
 337         req->tx_power = tx_power;
 338         req->ta = ta;
 339
 340         return osmo_send_l1(ms, msg);
 341 }
 342
 343 /* Transmit L1CTL_CRYPTO_REQ */
 344 int l1ctl_tx_crypto_req(struct osmocom_ms *ms, uint8_t algo, uint8_t *key,
 345         uint8_t len)
 346 {
 347         struct msgb *msg;
 348         struct l1ctl_info_ul *ul;
 349         struct l1ctl_crypto_req *req;
 350
 351         msg = osmo_l1_alloc(L1CTL_CRYPTO_REQ);
 352         if (!msg)
 353                 return -1;
 354
 355         DEBUGP(DL1C, "CRYPTO Req. algo=%d, len=%d\n", algo, len);
 356         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 357         req = (struct l1ctl_crypto_req *) msgb_put(msg, sizeof(*req) + len);
 358         req->algo = algo;
 359         if (len)
 360                 memcpy(req->key, key, len);
 361
 362         return osmo_send_l1(ms, msg);
 363 }
 364
 365 /* Transmit L1CTL_RACH_REQ */
 366 int l1ctl_tx_rach_req(struct osmocom_ms *ms, uint8_t ra, uint8_t fn51,
 367         uint8_t mf_off)
 368 {
 369         struct msgb *msg;
 370         struct l1ctl_info_ul *ul;
 371         struct l1ctl_rach_req *req;
 372
 373         msg = osmo_l1_alloc(L1CTL_RACH_REQ);
 374         if (!msg)
 375                 return -1;
 376
 377         DEBUGP(DL1C, "RACH Req. fn51=%d, mf_off=%d\n", fn51, mf_off);
 378         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 379         req = (struct l1ctl_rach_req *) msgb_put(msg, sizeof(*req));
 380         req->ra = ra;
 381         req->fn51 = fn51;
 382         req->mf_off = mf_off;
 383
 384         return osmo_send_l1(ms, msg);
 385 }
 386
 387 /* Transmit L1CTL_DM_EST_REQ */
 388 int l1ctl_tx_dm_est_req_h0(struct osmocom_ms *ms, uint16_t band_arfcn,
 389                            uint8_t chan_nr, uint8_t tsc, uint8_t tch_mode)
 390 {
 391         struct msgb *msg;
 392         struct l1ctl_info_ul *ul;
 393         struct l1ctl_dm_est_req *req;
 394
 395         msg = osmo_l1_alloc(L1CTL_DM_EST_REQ);
 396         if (!msg)
 397                 return -1;
 398
 399         LOGP(DL1C, LOGL_INFO, "Tx Dedic.Mode Est Req (arfcn=%u, "
 400                 "chan_nr=0x%02x)\n", band_arfcn, chan_nr);
 401
 402         memset(&ms->meas, 0, sizeof(ms->meas));
 403
 404         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 405         ul->chan_nr = chan_nr;
 406         ul->link_id = 0;
 407
 408         req = (struct l1ctl_dm_est_req *) msgb_put(msg, sizeof(*req));
 409         req->tsc = tsc;
 410         req->h = 0;
 411         req->h0.band_arfcn = htons(band_arfcn);
 412         req->tch_mode = tch_mode;
 413
 414         return osmo_send_l1(ms, msg);
 415 }
 416
 417 int l1ctl_tx_dm_est_req_h1(struct osmocom_ms *ms, uint8_t maio, uint8_t hsn,
 418                            uint16_t *ma, uint8_t ma_len,
 419                            uint8_t chan_nr, uint8_t tsc, uint8_t tch_mode)
 420 {
 421         struct msgb *msg;
 422         struct l1ctl_info_ul *ul;
 423         struct l1ctl_dm_est_req *req;
 424         int i;
 425
 426         msg = osmo_l1_alloc(L1CTL_DM_EST_REQ);
 427         if (!msg)
 428                 return -1;
 429
 430         LOGP(DL1C, LOGL_INFO, "Tx Dedic.Mode Est Req (maio=%u, hsn=%u, "
 431                 "chan_nr=0x%02x)\n", maio, hsn, chan_nr);
 432
 433         memset(&ms->meas, 0, sizeof(ms->meas));
 434
 435         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 436         ul->chan_nr = chan_nr;
 437         ul->link_id = 0;
 438
 439         req = (struct l1ctl_dm_est_req *) msgb_put(msg, sizeof(*req));
 440         req->tsc = tsc;
 441         req->h = 1;
 442         req->h1.maio = maio;
 443         req->h1.hsn = hsn;
 444         req->h1.n = ma_len;
 445         for (i = 0; i < ma_len; i++)
 446                 req->h1.ma[i] = htons(ma[i]);
 447         req->tch_mode = tch_mode;
 448
 449         return osmo_send_l1(ms, msg);
 450 }
 451
 452 /* Transmit L1CTL_DM_FREQ_REQ */
 453 int l1ctl_tx_dm_freq_req_h0(struct osmocom_ms *ms, uint16_t band_arfcn,
 454                             uint8_t tsc, uint16_t fn)
 455 {
 456         struct msgb *msg;
 457         struct l1ctl_info_ul *ul;
 458         struct l1ctl_dm_freq_req *req;
 459
 460         msg = osmo_l1_alloc(L1CTL_DM_FREQ_REQ);
 461         if (!msg)
 462                 return -1;
 463
 464         LOGP(DL1C, LOGL_INFO, "Tx Dedic.Mode Freq Req (arfcn=%u, fn=%d)\n",
 465                 band_arfcn, fn);
 466
 467         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 468         ul->chan_nr = 0;
 469         ul->link_id = 0;
 470
 471         req = (struct l1ctl_dm_freq_req *) msgb_put(msg, sizeof(*req));
 472         req->fn = htons(fn);
 473         req->tsc = tsc;
 474         req->h = 0;
 475         req->h0.band_arfcn = htons(band_arfcn);
 476
 477         return osmo_send_l1(ms, msg);
 478 }
 479
 480 int l1ctl_tx_dm_freq_req_h1(struct osmocom_ms *ms, uint8_t maio, uint8_t hsn,
 481                             uint16_t *ma, uint8_t ma_len,
 482                             uint8_t tsc, uint16_t fn)
 483 {
 484         struct msgb *msg;
 485         struct l1ctl_info_ul *ul;
 486         struct l1ctl_dm_freq_req *req;
 487         int i;
 488
 489         msg = osmo_l1_alloc(L1CTL_DM_FREQ_REQ);
 490         if (!msg)
 491                 return -1;
 492
 493         LOGP(DL1C, LOGL_INFO, "Tx Dedic.Mode Freq Req (maio=%u, hsn=%u, "
 494                 "fn=%d)\n", maio, hsn, fn);
 495
 496         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 497         ul->chan_nr = 0;
 498         ul->link_id = 0;
 499
 500         req = (struct l1ctl_dm_freq_req *) msgb_put(msg, sizeof(*req));
 501         req->fn = htons(fn);
 502         req->tsc = tsc;
 503         req->h = 1;
 504         req->h1.maio = maio;
 505         req->h1.hsn = hsn;
 506         req->h1.n = ma_len;
 507         for (i = 0; i < ma_len; i++)
 508                 req->h1.ma[i] = htons(ma[i]);
 509
 510         return osmo_send_l1(ms, msg);
 511 }
 512
 513 /* Transmit L1CTL_DM_REL_REQ */
 514 int l1ctl_tx_dm_rel_req(struct osmocom_ms *ms)
 515 {
 516         struct msgb *msg;
 517         struct l1ctl_info_ul *ul;
 518
 519         msg = osmo_l1_alloc(L1CTL_DM_REL_REQ);
 520         if (!msg)
 521                 return -1;
 522
 523         LOGP(DL1C, LOGL_INFO, "Tx Dedic.Mode Rel Req\n");
 524
 525         memset(&ms->meas, 0, sizeof(ms->meas));
 526
 527         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 528
 529         return osmo_send_l1(ms, msg);
 530 }
 531
 532 int l1ctl_tx_echo_req(struct osmocom_ms *ms, unsigned int len)
 533 {
 534         struct msgb *msg;
 535         uint8_t *data;
 536         unsigned int i;
 537
 538         msg = osmo_l1_alloc(L1CTL_ECHO_REQ);
 539         if (!msg)
 540                 return -1;
 541
 542         data = msgb_put(msg, len);
 543         for (i = 0; i < len; i++)
 544                 data[i] = i % 8;
 545
 546         return osmo_send_l1(ms, msg);
 547 }
 548
 549 int l1ctl_tx_sim_req(struct osmocom_ms *ms, uint8_t *data, uint16_t length)
 550 {
 551         struct msgb *msg;
 552         uint8_t *dat;
 553
 554         msg = osmo_l1_alloc(L1CTL_SIM_REQ);
 555         if (!msg)
 556                 return -1;
 557
 558         dat = msgb_put(msg, length);
 559         memcpy(dat, data, length);
 560
 561         return osmo_send_l1(ms, msg);
 562 }
 563
 564 /* just forward the SIM response to the SIM handler */
 565 static int rx_l1_sim_conf(struct osmocom_ms *ms, struct msgb *msg)
 566 {
 567         uint16_t len = msg->len - sizeof(struct l1ctl_hdr);
 568         uint8_t *data = msg->data + sizeof(struct l1ctl_hdr);
 569
 570         LOGP(DL1C, LOGL_INFO, "SIM %s\n", hexdump(data, len));
 571
 572         /* pull the L1 header from the msgb */
 573         msgb_pull(msg, sizeof(struct l1ctl_hdr));
 574         msg->l1h = NULL;
 575
 576         sim_apdu_resp(ms, msg);
 577
 578         return 0;
 579 }
 580
 581 /* Transmit L1CTL_PM_REQ */
 582 int l1ctl_tx_pm_req_range(struct osmocom_ms *ms, uint16_t arfcn_from,
 583                           uint16_t arfcn_to)
 584 {
 585         struct msgb *msg;
 586         struct l1ctl_pm_req *pm;
 587
 588         msg = osmo_l1_alloc(L1CTL_PM_REQ);
 589         if (!msg)
 590                 return -1;
 591
 592         LOGP(DL1C, LOGL_INFO, "Tx PM Req (%u-%u)\n", arfcn_from, arfcn_to);
 593         pm = (struct l1ctl_pm_req *) msgb_put(msg, sizeof(*pm));
 594         pm->type = 1;
 595         pm->range.band_arfcn_from = htons(arfcn_from);
 596         pm->range.band_arfcn_to = htons(arfcn_to);
 597
 598         return osmo_send_l1(ms, msg);
 599 }
 600
 601 /* Transmit L1CTL_RESET_REQ */
 602 int l1ctl_tx_reset_req(struct osmocom_ms *ms, uint8_t type)
 603 {
 604         struct msgb *msg;
 605         struct l1ctl_reset *res;
 606
 607         msg = osmo_l1_alloc(L1CTL_RESET_REQ);
 608         if (!msg)
 609                 return -1;
 610
 611         LOGP(DL1C, LOGL_INFO, "Tx Reset Req (%u)\n", type);
 612         res = (struct l1ctl_reset *) msgb_put(msg, sizeof(*res));
 613         res->type = type;
 614
 615         return osmo_send_l1(ms, msg);
 616 }
 617
 618 /* Receive L1CTL_RESET_IND */
 619 static int rx_l1_reset(struct osmocom_ms *ms)
 620 {
 621         LOGP(DL1C, LOGL_INFO, "Layer1 Reset indication\n");
 622         dispatch_signal(SS_L1CTL, S_L1CTL_RESET, ms);
 623
 624         return 0;
 625 }
 626
 627 /* Receive L1CTL_PM_CONF */
 628 static int rx_l1_pm_conf(struct osmocom_ms *ms, struct msgb *msg)
 629 {
 630         struct l1ctl_pm_conf *pmr;
 631
 632         for (pmr = (struct l1ctl_pm_conf *) msg->l1h;
 633              (uint8_t *) pmr < msg->tail; pmr++) {
 634                 struct osmobb_meas_res mr;
 635                 DEBUGP(DL1C, "PM MEAS: ARFCN: %4u RxLev: %3d %3d\n",
 636                         ntohs(pmr->band_arfcn), pmr->pm[0], pmr->pm[1]);
 637                 mr.band_arfcn = ntohs(pmr->band_arfcn);
 638                 mr.rx_lev = pmr->pm[0];
 639                 mr.ms = ms;
 640                 dispatch_signal(SS_L1CTL, S_L1CTL_PM_RES, &mr);
 641         }
 642         return 0;
 643 }
 644
 645 /* Receive L1CTL_CCCH_MODE_CONF */
 646 static int rx_l1_ccch_mode_conf(struct osmocom_ms *ms, struct msgb *msg)
 647 {
 648         struct osmobb_ccch_mode_conf mc;
 649         struct l1ctl_ccch_mode_conf *conf;
 650
 651         if (msgb_l3len(msg) < sizeof(*conf)) {
 652                 LOGP(DL1C, LOGL_ERROR, "CCCH MODE CONF: MSG too short %u\n",
 653                         msgb_l3len(msg));
 654                 return -1;
 655         }
 656
 657         conf = (struct l1ctl_ccch_mode_conf *) msg->l1h;
 658
 659         LOGP(DL1C, LOGL_INFO, "CCCH MODE CONF: mode=%u\n", conf->ccch_mode);
 660
 661         mc.ccch_mode = conf->ccch_mode;
 662         mc.ms = ms;
 663         dispatch_signal(SS_L1CTL, S_L1CTL_CCCH_MODE_CONF, &mc);
 664
 665         return 0;
 666 }
 667
 668 /* Receive L1CTL_TCH_MODE_CONF */
 669 static int rx_l1_tch_mode_conf(struct osmocom_ms *ms, struct msgb *msg)
 670 {
 671         struct osmobb_tch_mode_conf mc;
 672         struct l1ctl_tch_mode_conf *conf;
 673
 674         if (msgb_l3len(msg) < sizeof(*conf)) {
 675                 LOGP(DL1C, LOGL_ERROR, "TCH MODE CONF: MSG too short %u\n",
 676                         msgb_l3len(msg));
 677                 return -1;
 678         }
 679
 680         conf = (struct l1ctl_tch_mode_conf *) msg->l1h;
 681
 682         LOGP(DL1C, LOGL_INFO, "TCH MODE CONF: mode=%u\n", conf->tch_mode);
 683
 684         mc.tch_mode = conf->tch_mode;
 685         mc.ms = ms;
 686         dispatch_signal(SS_L1CTL, S_L1CTL_TCH_MODE_CONF, &mc);
 687
 688         return 0;
 689 }
 690
 691 /* Receive incoming data from L1 using L1CTL format */
 692 int l1ctl_recv(struct osmocom_ms *ms, struct msgb *msg)
 693 {
 694         int rc = 0;
 695         struct l1ctl_hdr *l1h;
 696         struct l1ctl_info_dl *dl;
 697
 698         if (msgb_l2len(msg) < sizeof(*dl)) {
 699                 LOGP(DL1C, LOGL_ERROR, "Short Layer2 message: %u\n",
 700                         msgb_l2len(msg));
 701                 msgb_free(msg);
 702                 return -1;
 703         }
 704
 705         l1h = (struct l1ctl_hdr *) msg->l1h;
 706
 707         /* move the l1 header pointer to point _BEHIND_ l1ctl_hdr,
 708            as the l1ctl header is of no interest to subsequent code */
 709         msg->l1h = l1h->data;
 710
 711         switch (l1h->msg_type) {
 712         case L1CTL_FBSB_CONF:
 713                 rc = rx_l1_fbsb_conf(ms, msg);
 714                 msgb_free(msg);
 715                 break;
 716         case L1CTL_DATA_IND:
 717                 rc = rx_ph_data_ind(ms, msg);
 718                 break;
 719         case L1CTL_DATA_CONF:
 720                 rc = rx_ph_data_conf(ms, msg);
 721                 break;
 722         case L1CTL_RESET_IND:
 723         case L1CTL_RESET_CONF:
 724                 rc = rx_l1_reset(ms);
 725                 msgb_free(msg);
 726                 break;
 727         case L1CTL_PM_CONF:
 728                 rc = rx_l1_pm_conf(ms, msg);
 729                 msgb_free(msg);
 730                 if (l1h->flags & L1CTL_F_DONE)
 731                         dispatch_signal(SS_L1CTL, S_L1CTL_PM_DONE, ms);
 732                 break;
 733         case L1CTL_RACH_CONF:
 734                 rc = rx_l1_rach_conf(ms, msg);
 735                 break;
 736         case L1CTL_CCCH_MODE_CONF:
 737                 rc = rx_l1_ccch_mode_conf(ms, msg);
 738                 msgb_free(msg);
 739                 break;
 740         case L1CTL_TCH_MODE_CONF:
 741                 rc = rx_l1_tch_mode_conf(ms, msg);
 742                 msgb_free(msg);
 743                 break;
 744         case L1CTL_SIM_CONF:
 745                 rc = rx_l1_sim_conf(ms, msg);
 746                 break;
 747         default:
 748                 LOGP(DL1C, LOGL_ERROR, "Unknown MSG: %u\n", l1h->msg_type);
 749                 msgb_free(msg);
 750                 break;
 751         }
 752
 753         return rc;
 754 }