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osmocom-bb/src/host/layer23/src/misc/layer3.c

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#include <stdint.h>
#include <errno.h>
#include <stdio.h>
#include <osmocore/msgb.h>
#include <osmocore/rsl.h>
#include <osmocore/tlv.h>
#include <osmocore/gsm48_ie.h>
#include <osmocore/protocol/gsm_04_08.h>
#include <osmocom/bb/common/logging.h>
#include <osmocom/bb/common/lapdm.h>
#include <osmocom/bb/misc/rslms.h>
#include <osmocom/bb/misc/layer3.h>
#include <osmocom/bb/common/osmocom_data.h>
#include <osmocom/bb/common/l1ctl.h>
static struct {
int has_si1;
int ccch_mode;
int ccch_enabled;
int rach_count;
struct gsm_sysinfo_freq cell_arfcns[1024];
} app_state;
static void dump_bcch(struct osmocom_ms *ms, uint8_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");
#ifdef BCCH_TC_CHECK
if (tc != 0)
fprintf(stderr, " on wrong TC");
#endif
if (!app_state.has_si1) {
struct gsm48_system_information_type_1 *si1 =
(struct gsm48_system_information_type_1 *)data;
gsm48_decode_freq_list(&app_state.cell_arfcns,
si1->cell_channel_description,
sizeof(si1->cell_channel_description),
0xff, 0x01);
app_state.has_si1 = 1;
}
break;
case GSM48_MT_RR_SYSINFO_2:
fprintf(stderr, "\tSI2");
#ifdef BCCH_TC_CHECK
if (tc != 1)
fprintf(stderr, " on wrong TC");
#endif
break;
case GSM48_MT_RR_SYSINFO_3:
fprintf(stderr, "\tSI3");
#ifdef BCCH_TC_CHECK
if (tc != 2 && tc != 6)
fprintf(stderr, " on wrong TC");
#endif
if (app_state.ccch_mode == CCCH_MODE_NONE) {
struct gsm48_system_information_type_3 *si3 =
(struct gsm48_system_information_type_3 *)data;
if (si3->control_channel_desc.ccch_conf == RSL_BCCH_CCCH_CONF_1_C)
app_state.ccch_mode = CCCH_MODE_COMBINED;
else
app_state.ccch_mode = CCCH_MODE_NON_COMBINED;
l1ctl_tx_ccch_mode_req(ms, app_state.ccch_mode);
}
break;
case GSM48_MT_RR_SYSINFO_4:
fprintf(stderr, "\tSI4");
#ifdef BCCH_TC_CHECK
if (tc != 3 && tc != 7)
fprintf(stderr, " on wrong TC");
#endif
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");
#ifdef BCCH_TC_CHECK
if (tc != 7)
fprintf(stderr, " on wrong TC");
#endif
break;
case GSM48_MT_RR_SYSINFO_8:
fprintf(stderr, "\tSI8");
#ifdef BCCH_TC_CHECK
if (tc != 3)
fprintf(stderr, " on wrong TC");
#endif
break;
case GSM48_MT_RR_SYSINFO_9:
fprintf(stderr, "\tSI9");
#ifdef BCCH_TC_CHECK
if (tc != 4)
fprintf(stderr, " on wrong TC");
#endif
break;
case GSM48_MT_RR_SYSINFO_13:
fprintf(stderr, "\tSI13");
#ifdef BCCH_TC_CHECK
if (tc != 4 && tc != 0)
fprintf(stderr, " on wrong TC");
#endif
break;
case GSM48_MT_RR_SYSINFO_16:
fprintf(stderr, "\tSI16");
#ifdef BCCH_TC_CHECK
if (tc != 6)
fprintf(stderr, " on wrong TC");
#endif
break;
case GSM48_MT_RR_SYSINFO_17:
fprintf(stderr, "\tSI17");
#ifdef BCCH_TC_CHECK
if (tc != 2)
fprintf(stderr, " on wrong TC");
#endif
break;
case GSM48_MT_RR_SYSINFO_2bis:
fprintf(stderr, "\tSI2bis");
#ifdef BCCH_TC_CHECK
if (tc != 5)
fprintf(stderr, " on wrong TC");
#endif
break;
case GSM48_MT_RR_SYSINFO_2ter:
fprintf(stderr, "\tSI2ter");
#ifdef BCCH_TC_CHECK
if (tc != 5 && tc != 4)
fprintf(stderr, " on wrong TC");
#endif
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");
}
/* send location updating request * (as part of RSLms EST IND /
LAPDm SABME) */
static int gsm48_tx_loc_upd_req(struct osmocom_ms *ms, uint8_t chan_nr)
{
struct msgb *msg = msgb_alloc_headroom(256, 16, "loc_upd_req");
struct gsm48_hdr *gh;
struct gsm48_loc_upd_req *lu_r;
DEBUGP(DMM, "chan_nr=%u\n", chan_nr);
msg->l3h = msgb_put(msg, sizeof(*gh));
gh = (struct gsm48_hdr *) msg->l3h;
gh->proto_discr = GSM48_PDISC_MM;
gh->msg_type = GSM48_MT_MM_LOC_UPD_REQUEST;
lu_r = (struct gsm48_loc_upd_req *) msgb_put(msg, sizeof(*lu_r));
lu_r->type = GSM48_LUPD_IMSI_ATT;
lu_r->key_seq = 0;
/* FIXME: set LAI and CM1 */
/* FIXME: set MI */
lu_r->mi_len = 0;
return rslms_tx_rll_req_l3(ms, RSL_MT_EST_REQ, chan_nr, 0, msg);
}
static int gsm48_rx_imm_ass(struct msgb *msg, struct osmocom_ms *ms)
{
struct gsm48_imm_ass *ia = msgb_l3(msg);
uint8_t ch_type, ch_subch, ch_ts;
int rv;
/* Discard packet TBF assignement */
if (ia->page_mode & 0xf0)
return 0;
/* FIXME: compare RA and GSM time with when we sent RACH req */
rsl_dec_chan_nr(ia->chan_desc.chan_nr, &ch_type, &ch_subch, &ch_ts);
if (!ia->chan_desc.h0.h) {
/* Non-hopping */
uint16_t arfcn;
arfcn = ia->chan_desc.h0.arfcn_low | (ia->chan_desc.h0.arfcn_high << 8);
DEBUGP(DRR, "GSM48 IMM ASS (ra=0x%02x, chan_nr=0x%02x, "
"ARFCN=%u, TS=%u, SS=%u, TSC=%u) ", ia->req_ref.ra,
ia->chan_desc.chan_nr, arfcn, ch_ts, ch_subch,
ia->chan_desc.h0.tsc);
/* request L1 to go to dedicated mode on assigned channel */
rv = l1ctl_tx_dm_est_req_h0(ms,
arfcn, ia->chan_desc.chan_nr, ia->chan_desc.h0.tsc,
GSM48_CMODE_SIGN);
} else {
/* Hopping */
uint8_t maio, hsn, ma_len;
uint16_t ma[64], arfcn;
int i, j, k;
hsn = ia->chan_desc.h1.hsn;
maio = ia->chan_desc.h1.maio_low | (ia->chan_desc.h1.maio_high << 2);
DEBUGP(DRR, "GSM48 IMM ASS (ra=0x%02x, chan_nr=0x%02x, "
"HSN=%u, MAIO=%u, TS=%u, SS=%u, TSC=%u) ", ia->req_ref.ra,
ia->chan_desc.chan_nr, hsn, maio, ch_ts, ch_subch,
ia->chan_desc.h1.tsc);
/* decode mobile allocation */
ma_len = 0;
for (i=1, j=0; i<=1024; i++) {
arfcn = i & 1023;
if (app_state.cell_arfcns[arfcn].mask & 0x01) {
k = ia->mob_alloc_len - (j>>3) - 1;
if (ia->mob_alloc[k] & (1 << (j&7))) {
ma[ma_len++] = arfcn;
}
j++;
}
}
/* request L1 to go to dedicated mode on assigned channel */
rv = l1ctl_tx_dm_est_req_h1(ms,
maio, hsn, ma, ma_len,
ia->chan_desc.chan_nr, ia->chan_desc.h1.tsc,
GSM48_CMODE_SIGN);
}
DEBUGPC(DRR, "\n");
rv = gsm48_tx_loc_upd_req(ms, ia->chan_desc.chan_nr);
return rv;
}
int gsm48_rx_ccch(struct msgb *msg, struct osmocom_ms *ms)
{
struct gsm48_system_information_type_header *sih = msgb_l3(msg);
int rc = 0;
if (sih->rr_protocol_discriminator != GSM48_PDISC_RR)
LOGP(DRR, LOGL_ERROR, "PCH pdisc != RR\n");
switch (sih->system_information) {
case GSM48_MT_RR_PAG_REQ_1:
case GSM48_MT_RR_PAG_REQ_2:
case GSM48_MT_RR_PAG_REQ_3:
/* FIXME: implement decoding of paging request */
break;
case GSM48_MT_RR_IMM_ASS:
rc = gsm48_rx_imm_ass(msg, ms);
break;
default:
LOGP(DRR, LOGL_NOTICE, "unknown PCH/AGCH type 0x%02x\n",
sih->system_information);
rc = -EINVAL;
}
return rc;
}
int gsm48_rx_bcch(struct msgb *msg, struct osmocom_ms *ms)
{
/* FIXME: we have lost the gsm frame time until here, need to store it
* in some msgb context */
//dump_bcch(dl->time.tc, ccch->data);
dump_bcch(ms, 0, msg->l3h);
/* Req channel logic */
if (app_state.ccch_enabled && (app_state.rach_count < 2)) {
l1ctl_tx_rach_req(ms, app_state.rach_count, 0,
app_state.ccch_mode == CCCH_MODE_COMBINED);
app_state.rach_count++;
}
return 0;
}
void layer3_app_reset(void)
{
/* Reset state */
app_state.has_si1 = 0;
app_state.ccch_mode = CCCH_MODE_NONE;
app_state.ccch_enabled = 0;
app_state.rach_count = 0;
memset(&app_state.cell_arfcns, 0x00, sizeof(app_state.cell_arfcns));
}
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