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/* Layer2 handling code... LAPD and stuff
*
* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <osmocom/osmocom_layer2.h>
#include <osmocom/osmocom_data.h>
#include <osmocom/debug.h>
#include <osmocom/gsm_04_08.h>
#include <stdio.h>
#include <stdint.h>
#include <l1a_l23_interface.h>
static struct msgb *osmo_l1_alloc(uint8_t msg_type)
{
struct l1_info_ul *ul;
struct msgb *msg = msgb_alloc_headroom(256, 4, "osmo_l1");
if (!msg) {
fprintf(stderr, "Failed to allocate memory.\n");
return NULL;
}
ul = (struct l1_info_ul *) msgb_put(msg, sizeof(*ul));
ul->msg_type = msg_type;
return msg;
}
static int osmo_make_band_arfcn(struct osmocom_ms *ms)
{
/* TODO: Include the band */
return ms->arfcn;
}
static int osmo_l2_ccch_resp(struct osmocom_ms *ms, struct msgb *msg)
{
struct l1_info_dl *dl;
struct l1_sync_new_ccch_resp *sb;
if (msgb_l3len(msg) < sizeof(*sb)) {
fprintf(stderr, "MSG too short for CCCH RESP: %u\n", msgb_l3len(msg));
return -1;
}
dl = (struct l1_info_dl *) msg->l2h;
sb = (struct l1_sync_new_ccch_resp *) msg->l3h;
printf("Found sync burst: SNR: %u TDMA: (%.4u/%.2u/%.2u) bsic: %d\n",
dl->snr[0], dl->time.t1, dl->time.t2, dl->time.t3, sb->bsic);
return 0;
}
static void dump_bcch(u_int8_t tc, const uint8_t *data)
{
struct gsm48_system_information_type_header *si_hdr;
si_hdr = (struct gsm48_system_information_type_header *) data;;
/* GSM 05.02 §6.3.1.3 Mapping of BCCH data */
switch (si_hdr->system_information) {
case GSM48_MT_RR_SYSINFO_1:
fprintf(stderr, "\tSI1");
if (tc != 0)
fprintf(stderr, " on wrong TC");
break;
case GSM48_MT_RR_SYSINFO_2:
fprintf(stderr, "\tSI2");
if (tc != 1)
fprintf(stderr, " on wrong TC");
break;
case GSM48_MT_RR_SYSINFO_3:
fprintf(stderr, "\tSI3");
if (tc != 2 && tc != 6)
fprintf(stderr, " on wrong TC");
break;
case GSM48_MT_RR_SYSINFO_4:
fprintf(stderr, "\tSI4");
if (tc != 3 && tc != 7)
fprintf(stderr, " on wrong TC");
break;
case GSM48_MT_RR_SYSINFO_5:
fprintf(stderr, "\tSI5");
break;
case GSM48_MT_RR_SYSINFO_6:
fprintf(stderr, "\tSI6");
break;
case GSM48_MT_RR_SYSINFO_7:
fprintf(stderr, "\tSI7");
if (tc != 7)
fprintf(stderr, " on wrong TC");
break;
case GSM48_MT_RR_SYSINFO_8:
fprintf(stderr, "\tSI8");
if (tc != 3)
fprintf(stderr, " on wrong TC");
break;
case GSM48_MT_RR_SYSINFO_9:
fprintf(stderr, "\tSI9");
if (tc != 4)
fprintf(stderr, " on wrong TC");
break;
case GSM48_MT_RR_SYSINFO_13:
fprintf(stderr, "\tSI13");
if (tc != 4 && tc != 0)
fprintf(stderr, " on wrong TC");
break;
case GSM48_MT_RR_SYSINFO_16:
fprintf(stderr, "\tSI16");
if (tc != 6)
fprintf(stderr, " on wrong TC");
break;
case GSM48_MT_RR_SYSINFO_17:
fprintf(stderr, "\tSI17");
if (tc != 2)
fprintf(stderr, " on wrong TC");
break;
case GSM48_MT_RR_SYSINFO_2bis:
fprintf(stderr, "\tSI2bis");
if (tc != 5)
fprintf(stderr, " on wrong TC");
break;
case GSM48_MT_RR_SYSINFO_2ter:
fprintf(stderr, "\tSI2ter");
if (tc != 5 && tc != 4)
fprintf(stderr, " on wrong TC");
break;
case GSM48_MT_RR_SYSINFO_5bis:
fprintf(stderr, "\tSI5bis");
break;
case GSM48_MT_RR_SYSINFO_5ter:
fprintf(stderr, "\tSI5ter");
break;
default:
fprintf(stderr, "\tUnknown SI");
break;
};
fprintf(stderr, "\n");
}
static int osmo_l2_ccch_data(struct osmocom_ms *ms, struct msgb *msg)
{
struct l1_info_dl *dl;
struct l1_ccch_info_ind *ccch;
if (msgb_l3len(msg) < sizeof(*ccch)) {
fprintf(stderr, "MSG too short CCCH Data Ind: %u\n", msgb_l3len(msg));
return -1;
}
dl = (struct l1_info_dl *) msg->l2h;
ccch = (struct l1_ccch_info_ind *) msg->l3h;
printf("Found CCCH burst(s): TDMA: (%.4u/%.2u/%.2u) tc:%d %s si: 0x%x\n",
dl->time.t1, dl->time.t2, dl->time.t3, dl->time.tc,
hexdump(ccch->data, sizeof(ccch->data)), ccch->data[2]);
dump_bcch(dl->time.tc, ccch->data);
return 0;
}
static int osmo_l1_reset(struct osmocom_ms *ms)
{
struct msgb *msg;
struct l1_sync_new_ccch_req *req;
msg = osmo_l1_alloc(SYNC_NEW_CCCH_REQ);
if (!msg)
return -1;
printf("Layer1 Reset.\n");
req = (struct l1_sync_new_ccch_req *) msgb_put(msg, sizeof(*req));
req->band_arfcn = osmo_make_band_arfcn(ms);
return osmo_send_l1(ms, msg);
}
int osmo_recv(struct osmocom_ms *ms, struct msgb *msg)
{
int rc = 0;
struct l1_info_dl *dl;
if (msgb_l2len(msg) < sizeof(*dl)) {
fprintf(stderr, "Short Layer2 message: %u\n", msgb_l2len(msg));
return -1;
}
dl = (struct l1_info_dl *) msg->l2h;
msg->l3h = &msg->l2h[0] + sizeof(*dl);
switch (dl->msg_type) {
case SYNC_NEW_CCCH_RESP:
rc = osmo_l2_ccch_resp(ms, msg);
break;
case CCCH_INFO_IND:
rc = osmo_l2_ccch_data(ms, msg);
break;
case LAYER1_RESET:
rc = osmo_l1_reset(ms);
break;
default:
fprintf(stderr, "Unknown MSG: %u\n", dl->msg_type);
break;
}
return rc;
}
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