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osmo-bsc/src/osmo-bsc/system_information.c

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/* GSM 04.08 System Information (SI) encoding and decoding
* 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */
/* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org>
* (C) 2012 Holger Hans Peter Freyther
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <netinet/in.h>
#include <stdbool.h>
#include <osmocom/core/bitvec.h>
#include <osmocom/core/utils.h>
#include <osmocom/gsm/sysinfo.h>
#include <osmocom/gsm/gsm48_ie.h>
#include <osmocom/gsm/gsm48_rest_octets.h>
#include <osmocom/gsm/gsm48.h>
#include <osmocom/gsm/gsm48_arfcn_range_encode.h>
#include <osmocom/bsc/debug.h>
#include <osmocom/bsc/gsm_data.h>
#include <osmocom/bsc/abis_rsl.h>
#include <osmocom/bsc/gsm_04_08_rr.h>
#include <osmocom/bsc/acc.h>
#include <osmocom/bsc/neighbor_ident.h>
#include <osmocom/bsc/bts.h>
struct gsm0808_cell_id_list2;
/*
* DCS1800 and PCS1900 have overlapping ARFCNs. We would need to set the
* ARFCN_PCS flag on the 1900 ARFCNs but this would increase cell_alloc
* and other arrays to make sure (ARFCN_PCS + 1024)/8 ARFCNs fit into the
* array. DCS1800 and PCS1900 can not be used at the same time so conserve
* memory and do the below.
*/
int band_compatible(const struct gsm_bts *bts, int arfcn)
{
enum gsm_band band;
if (gsm_arfcn2band_rc(arfcn, &band) < 0) {
LOGP(DRR, LOGL_ERROR, "Invalid arfcn %d detected!\n", arfcn);
return 0;
}
/* normal case */
if (band == bts->band)
return 1;
/* deal with ARFCN_PCS not set */
if (band == GSM_BAND_1800 && bts->band == GSM_BAND_1900)
return 1;
return 0;
}
static int is_dcs_net(const struct gsm_bts *bts)
{
if (bts->band == GSM_BAND_850)
return 0;
if (bts->band == GSM_BAND_1900)
return 0;
return 1;
}
/* Return p(n) for given NR_OF_TDD_CELLS - see Table 9.1.54.1a, 3GPP TS 44.018 */
unsigned range1024_p(unsigned n)
{
switch (n) {
case 0: return 0;
case 1: return 10;
case 2: return 19;
case 3: return 28;
case 4: return 36;
case 5: return 44;
case 6: return 52;
case 7: return 60;
case 8: return 67;
case 9: return 74;
case 10: return 81;
case 11: return 88;
case 12: return 95;
case 13: return 102;
case 14: return 109;
case 15: return 116;
case 16: return 122;
default: return 0;
}
}
/* Return q(m) for given NR_OF_TDD_CELLS - see Table 9.1.54.1b, 3GPP TS 44.018 */
unsigned range512_q(unsigned m)
{
switch (m) {
case 0: return 0;
case 1: return 9;
case 2: return 17;
case 3: return 25;
case 4: return 32;
case 5: return 39;
case 6: return 46;
case 7: return 53;
case 8: return 59;
case 9: return 65;
case 10: return 71;
case 11: return 77;
case 12: return 83;
case 13: return 89;
case 14: return 95;
case 15: return 101;
case 16: return 106;
case 17: return 111;
case 18: return 116;
case 19: return 121;
case 20: return 126;
default: return 0;
}
}
size_t si2q_earfcn_count(const struct osmo_earfcn_si2q *e)
{
unsigned i, ret = 0;
if (!e)
return 0;
for (i = 0; i < e->length; i++)
if (e->arfcn[i] != OSMO_EARFCN_INVALID)
ret++;
return ret;
}
/* generate SI2quater messages, return rest octets length of last generated message or negative error code */
static int make_si2quaters(struct gsm_bts *bts, bool counting)
{
int rc;
bool memory_exceeded = true;
struct gsm48_system_information_type_2quater *si2q;
for (bts->si2q_index = 0; bts->si2q_index < SI2Q_MAX_NUM; bts->si2q_index++) {
si2q = GSM_BTS_SI2Q(bts, bts->si2q_index);
if (counting) { /* that's legitimate if we're called for counting purpose: */
if (bts->si2q_count < bts->si2q_index)
bts->si2q_count = bts->si2q_index;
} else {
memset(si2q, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
si2q->header.l2_plen = GSM48_LEN2PLEN(22);
si2q->header.rr_protocol_discriminator = GSM48_PDISC_RR;
si2q->header.skip_indicator = 0;
si2q->header.system_information = GSM48_MT_RR_SYSINFO_2quater;
}
rc = osmo_gsm48_rest_octets_si2quater_encode(si2q->rest_octets, bts->si2q_index,
bts->si2q_count, bts->si_common.data.uarfcn_list,
&bts->u_offset, bts->si_common.uarfcn_length,
bts->si_common.data.scramble_list,
&bts->si_common.si2quater_neigh_list,
&bts->e_offset);
if (rc < 0)
return rc;
if (bts->u_offset >= bts->si_common.uarfcn_length &&
bts->e_offset >= si2q_earfcn_count(&bts->si_common.si2quater_neigh_list)) {
memory_exceeded = false;
break;
}
}
if (memory_exceeded)
return -ENOMEM;
return rc;
}
/* we generate SI2q rest octets twice to get proper estimation but it's one time cost anyway */
uint8_t si2q_num(struct gsm_bts *bts)
{
int rc = make_si2quaters(bts, true);
uint8_t num = bts->si2q_index + 1; /* number of SI2quater messages */
/* N. B: si2q_num() should NEVER be called during actual SI2q rest octets generation
we're not re-entrant because of the following code: */
bts->u_offset = 0;
bts->e_offset = 0;
if (rc < 0)
return 0xFF; /* return impossible index as an indicator of error in generating SI2quater */
return num;
}
/* 3GPP TS 44.018, Table 9.1.54.1 - prepend diversity bit to scrambling code */
static inline uint16_t encode_fdd(uint16_t scramble, bool diversity)
{
if (diversity)
return scramble | (1 << 9);
return scramble;
}
int bts_earfcn_del(struct gsm_bts *bts, uint16_t earfcn)
{
struct osmo_earfcn_si2q *e = &bts->si_common.si2quater_neigh_list;
int r;
r = osmo_earfcn_del(e, earfcn);
if (r < 0)
return r;
/* If the last earfcn was removed, invlidate common neighbours limitations */
if (si2q_earfcn_count(e) == 0) {
e->thresh_lo_valid = false;
e->qrxlm_valid = false;
e->prio_valid = false;
}
return r;
}
int bts_earfcn_add(struct gsm_bts *bts, uint16_t earfcn, uint8_t thresh_hi, uint8_t thresh_lo, uint8_t prio,
uint8_t qrx, uint8_t meas_bw)
{
struct osmo_earfcn_si2q *e = &bts->si_common.si2quater_neigh_list;
int r;
/* EARFCN may already exist, so we delete it to avoid duplicates */
if (bts_earfcn_del(bts, earfcn) == 0)
LOGP(DRR, LOGL_NOTICE, "EARFCN %u is already in the list, modifying\n", earfcn);
if (meas_bw < EARFCN_MEAS_BW_INVALID)
r = osmo_earfcn_add(e, earfcn, meas_bw);
else
r = osmo_earfcn_add(e, earfcn, OSMO_EARFCN_MEAS_INVALID);
if (r < 0)
return r;
if (e->thresh_hi && thresh_hi != e->thresh_hi)
r = 1;
e->thresh_hi = thresh_hi;
if (thresh_lo != EARFCN_THRESH_LOW_INVALID) {
if (e->thresh_lo_valid && e->thresh_lo != thresh_lo)
r = EARFCN_THRESH_LOW_INVALID;
e->thresh_lo = thresh_lo;
e->thresh_lo_valid = true;
}
if (qrx != EARFCN_QRXLV_INVALID) {
if (e->qrxlm_valid && e->qrxlm != qrx)
r = EARFCN_QRXLV_INVALID + 1;
e->qrxlm = qrx;
e->qrxlm_valid = true;
}
if (prio != EARFCN_PRIO_INVALID) {
if (e->prio_valid && e->prio != prio)
r = EARFCN_PRIO_INVALID;
e->prio = prio;
e->prio_valid = true;
}
return r;
}
/* Scrambling Code as defined in 3GPP TS 25.213 is 9 bit long so number below is unreachable upper bound */
#define SC_BOUND 600
/* Find position for a given UARFCN (take SC into consideration if it's available) in a sorted list
N. B: we rely on the assumption that (uarfcn, scramble) tuple is unique in the lists */
static int uarfcn_sc_pos(const struct gsm_bts *bts, uint16_t uarfcn, uint16_t scramble)
{
const uint16_t *sc = bts->si_common.data.scramble_list;
uint16_t i, scramble0 = encode_fdd(scramble, false), scramble1 = encode_fdd(scramble, true);
for (i = 0; i < bts->si_common.uarfcn_length; i++)
if (uarfcn == bts->si_common.data.uarfcn_list[i]) {
if (scramble < SC_BOUND) {
if (scramble0 == sc[i] || scramble1 == sc[i])
return i;
} else
return i;
}
return -1;
}
int bts_uarfcn_del(struct gsm_bts *bts, uint16_t arfcn, uint16_t scramble)
{
uint16_t *ual = bts->si_common.data.uarfcn_list, *scl = bts->si_common.data.scramble_list;
size_t len = bts->si_common.uarfcn_length;
int pos = uarfcn_sc_pos(bts, arfcn, scramble);
if (pos < 0)
return -EINVAL;
if (pos != len - 1) { /* move the tail if necessary */
memmove(ual + pos, ual + pos + 1, 2 * (len - pos + 1));
memmove(scl + pos, scl + pos + 1, 2 * (len - pos + 1));
}
bts->si_common.uarfcn_length--;
return 0;
}
int bts_uarfcn_add(struct gsm_bts *bts, uint16_t arfcn, uint16_t scramble, bool diversity)
{
size_t len = bts->si_common.uarfcn_length, i;
uint8_t si2q;
int pos = uarfcn_sc_pos(bts, arfcn, scramble);
uint16_t scr = encode_fdd(scramble, diversity),
*ual = bts->si_common.data.uarfcn_list,
*scl = bts->si_common.data.scramble_list;
if (pos >= 0) {
LOGP(DRR, LOGL_NOTICE,
"EARFCN (%u, %u) is already in the list, modifying\n",
arfcn, scramble);
scl[pos] = scr;
return 0;
}
if (len == MAX_EARFCN_LIST)
return -ENOMEM;
/* find the suitable position for arfcn if any */
pos = uarfcn_sc_pos(bts, arfcn, SC_BOUND);
i = (pos < 0) ? len : pos;
/* move the tail to make space for inserting if necessary */
if (i < len) {
memmove(ual + i + 1, ual + i, (len - i) * 2);
memmove(scl + i + 1, scl + i, (len - i) * 2);
}
/* insert into appropriate position */
ual[i] = arfcn;
scl[i] = scr;
bts->si_common.uarfcn_length++;
/* try to generate SI2q */
si2q = si2q_num(bts);
if (si2q <= SI2Q_MAX_NUM) {
bts->si2q_count = si2q - 1;
return 0;
}
/* rollback after unsuccessful generation */
bts_uarfcn_del(bts, arfcn, scramble);
return -ENOSPC;
}
static inline int use_arfcn(const struct gsm_bts *bts, const bool bis, const bool ter,
const bool pgsm, const int arfcn)
{
if (bts->force_combined_si_set ? bts->force_combined_si : bts->model->force_combined_si)
return !bis && !ter;
if (!bis && !ter && band_compatible(bts, arfcn))
return 1;
/* Correct but somehow broken with either the nanoBTS or the iPhone5 */
if (bis && pgsm && band_compatible(bts, arfcn) && (arfcn < 1 || arfcn > 124))
return 1;
if (ter && !band_compatible(bts, arfcn))
return 1;
return 0;
}
/* Frequency Lists as per TS 04.08 10.5.2.13 */
/* 10.5.2.13.2: Bit map 0 format */
static int freq_list_bm0_set_arfcn(uint8_t *chan_list, unsigned int arfcn)
{
unsigned int byte, bit;
if (arfcn > 124 || arfcn < 1) {
LOGP(DRR, LOGL_ERROR, "Bitmap 0 only supports ARFCN 1...124\n");
return -EINVAL;
}
/* the bitmask is from 1..124, not from 0..123 */
arfcn--;
byte = arfcn / 8;
bit = arfcn % 8;
chan_list[GSM48_CELL_CHAN_DESC_SIZE-1-byte] |= (1 << bit);
return 0;
}
/* 10.5.2.13.7: Variable bit map format */
static int freq_list_bmrel_set_arfcn(uint8_t *chan_list, unsigned int arfcn)
{
unsigned int byte, bit;
unsigned int min_arfcn;
unsigned int bitno;
min_arfcn = (chan_list[0] & 1) << 9;
min_arfcn |= chan_list[1] << 1;
min_arfcn |= (chan_list[2] >> 7) & 1;
/* The lower end of our bitmaks is always implicitly included */
if (arfcn == min_arfcn)
return 0;
if (((arfcn - min_arfcn) & 1023) > 111) {
LOGP(DRR, LOGL_ERROR, "arfcn(%u) > min(%u) + 111\n", arfcn, min_arfcn);
return -EINVAL;
}
bitno = (arfcn - min_arfcn) & 1023;
byte = bitno / 8;
bit = bitno % 8;
chan_list[2 + byte] |= 1 << (7 - bit);
return 0;
}
/* generate a variable bitmap */
static inline int enc_freq_lst_var_bitmap(uint8_t *chan_list,
const struct bitvec *bv, const struct gsm_bts *bts,
bool bis, bool ter, int min, bool pgsm)
{
int i;
/* set it to 'Variable bitmap format' */
chan_list[0] = 0x8e;
chan_list[0] |= (min >> 9) & 1;
chan_list[1] = (min >> 1);
chan_list[2] = (min & 1) << 7;
for (i = 0; i < bv->data_len*8; i++) {
/* see notes in bitvec2freq_list */
if (bitvec_get_bit_pos(bv, i)
&& ((!bis && !ter && band_compatible(bts,i))
|| (bis && pgsm && band_compatible(bts,i) && (i < 1 || i > 124))
|| (ter && !band_compatible(bts, i)))) {
int rc = freq_list_bmrel_set_arfcn(chan_list, i);
if (rc < 0)
return rc;
}
}
return 0;
}
int range_encode(enum osmo_gsm48_range r, int *arfcns, int arfcns_used, int *w,
int f0, uint8_t *chan_list)
{
/*
* Manipulate the ARFCN list according to the rules in J4 depending
* on the selected range.
*/
int rc, f0_included;
osmo_gsm48_range_enc_filter_arfcns(arfcns, arfcns_used, f0, &f0_included);
rc = osmo_gsm48_range_enc_arfcns(r, arfcns, arfcns_used, w, 0);
if (rc < 0)
return rc;
/* Select the range and the amount of bits needed */
switch (r) {
case OSMO_GSM48_ARFCN_RANGE_128:
return osmo_gsm48_range_enc_128(chan_list, f0, w);
case OSMO_GSM48_ARFCN_RANGE_256:
return osmo_gsm48_range_enc_256(chan_list, f0, w);
case OSMO_GSM48_ARFCN_RANGE_512:
return osmo_gsm48_range_enc_512(chan_list, f0, w);
case OSMO_GSM48_ARFCN_RANGE_1024:
return osmo_gsm48_range_enc_1024(chan_list, f0, f0_included, w);
default:
return -ERANGE;
};
return f0_included;
}
/* generate a frequency list with the range 512 format */
static inline int enc_freq_lst_range(uint8_t *chan_list,
const struct bitvec *bv, const struct gsm_bts *bts,
bool bis, bool ter, bool pgsm)
{
int arfcns[OSMO_GSM48_RANGE_ENC_MAX_ARFCNS];
int w[OSMO_GSM48_RANGE_ENC_MAX_ARFCNS];
int arfcns_used = 0;
int i, range, f0;
/*
* Select ARFCNs according to the rules in bitvec2freq_list
*/
for (i = 0; i < bv->data_len * 8; ++i) {
/* More ARFCNs than the maximum */
if (arfcns_used > ARRAY_SIZE(arfcns))
return -1;
/* Check if we can select it? */
if (bitvec_get_bit_pos(bv, i) && use_arfcn(bts, bis, ter, pgsm, i))
arfcns[arfcns_used++] = i;
}
/*
* Check if the given list of ARFCNs can be encoded.
*/
range = osmo_gsm48_range_enc_determine_range(arfcns, arfcns_used, &f0);
if (range == OSMO_GSM48_ARFCN_RANGE_INVALID)
return -2;
memset(w, 0, sizeof(w));
return range_encode(range, arfcns, arfcns_used, w, f0, chan_list);
}
/* generate a cell channel list as per Section 10.5.2.1b of 04.08 */
static int bitvec2freq_list(uint8_t *chan_list, const struct bitvec *bv,
const struct gsm_bts *bts, bool bis, bool ter)
{
int i, rc, min = -1, max = -1, arfcns = 0;
bool pgsm = false;
memset(chan_list, 0, 16);
/* According to 3GPP TS 44.018, section 10.5.2.1b.2, only ARFCN values
* in range 1..124 can be encoded using the 'bit map 0' format. */
if (bts->band == GSM_BAND_900)
pgsm = true;
/* Check presence of E-GSM ARFCN 0 */
if (pgsm && bitvec_get_bit_pos(bv, 0) == ONE)
pgsm = false;
/* Check presence of R-GSM / E-GSM ARFCNs 955..1023 */
for (i = 955; pgsm && i <= 1023; i++) {
if (bitvec_get_bit_pos(bv, i) == ONE)
pgsm = false;
}
/* P-GSM-only handsets only support 'bit map 0 format' */
if (!bis && !ter && pgsm) {
chan_list[0] = 0;
for (i = 1; i <= 124; i++) {
if (!bitvec_get_bit_pos(bv, i))
continue;
rc = freq_list_bm0_set_arfcn(chan_list, i);
if (rc < 0)
return rc;
}
return 0;
}
for (i = 0; i < bv->data_len*8; i++) {
/* in case of SI2 or SI5 allow all neighbours in same band
* in case of SI*bis, allow neighbours in same band outside pgsm
* in case of SI*ter, allow neighbours in different bands
*/
if (!bitvec_get_bit_pos(bv, i))
continue;
if (!use_arfcn(bts, bis, ter, pgsm, i))
continue;
/* count the arfcns we want to carry */
arfcns += 1;
/* 955..1023 < 0..885 */
if (min < 0)
min = i;
if (i >= 955 && min < 955)
min = i;
if (i >= 955 && min >= 955 && i < min)
min = i;
if (i < 955 && min < 955 && i < min)
min = i;
if (max < 0)
max = i;
if (i < 955 && max >= 955)
max = i;
if (i >= 955 && max >= 955 && i > max)
max = i;
if (i < 955 && max < 955 && i > max)
max = i;
}
if (arfcns == 0) {
/* Empty set, use 'bit map 0 format' */
chan_list[0] = 0;
return 0;
}
/* Now find the best encoding */
if (((max - min) & 1023) <= 111)
return enc_freq_lst_var_bitmap(chan_list, bv, bts, bis,
ter, min, pgsm);
/* Attempt to do the range encoding */
rc = enc_freq_lst_range(chan_list, bv, bts, bis, ter, pgsm);
if (rc >= 0)
return 0;
LOGP(DRR, LOGL_ERROR, "min_arfcn=%u, max_arfcn=%u, arfcns=%d "
"can not generate ARFCN list\n", min, max, arfcns);
return -EINVAL;
}
/* (Re)generate Cell Allocation (basically a bit-vector of all cell channels) */
int generate_cell_chan_alloc(struct gsm_bts *bts)
{
const struct gsm_bts_trx *trx;
unsigned int chan, chan_num;
unsigned int tn;
/* Temporary Cell Allocation bit-vector */
uint8_t ca[1024 / 8] = { 0 };
struct bitvec bv = {
.data_len = sizeof(ca),
.data = &ca[0],
};
/* Calculate a bit-mask of all assigned ARFCNs */
llist_for_each_entry(trx, &bts->trx_list, list) {
/* Always add the TRX's ARFCN */
bitvec_set_bit_pos(&bv, trx->arfcn, 1);
for (tn = 0; tn < ARRAY_SIZE(trx->ts); tn++) {
const struct gsm_bts_trx_ts *ts = &trx->ts[tn];
/* Add any ARFCNs present in hopping channels */
for (chan = 0; chan < sizeof(ca) * 8; chan++) {
if (bitvec_get_bit_pos(&ts->hopping.arfcns, chan) == ONE)
bitvec_set_bit_pos(&bv, chan, ONE);
}
}
}
/* Calculate the overall number of assigned ARFCNs */
for (chan_num = 0, chan = 0; chan < sizeof(ca) * 8; chan++) {
if (bitvec_get_bit_pos(&bv, chan) == ONE)
chan_num++;
}
/* The Mobile Allocation IE may contain up to 64 bits, so here we
* cannot allow more than 64 channels in Cell Allocation. */
if (chan_num > 64) {
LOGP(DRR, LOGL_ERROR, "Failed to (re)generate Cell Allocation: "
"number of channels (%u) exceeds the maximum number of "
"ARFCNs in Mobile Allocation (64)\n", chan_num);
return -E2BIG;
}
/* Commit the new Channel Allocation */
memcpy(&bts->si_common.data.cell_alloc[0], ca, sizeof(ca));
bts->si_common.cell_chan_num = chan_num;
return 0;
}
/* generate a cell channel list as per Section 10.5.2.1b of 04.08 */
int generate_cell_chan_list(uint8_t *chan_list, struct gsm_bts *bts)
{
const struct bitvec *bv = &bts->si_common.cell_alloc;
/* generate a Frequency List from the Cell Allocation */
return bitvec2freq_list(chan_list, bv, bts, false, false);
}
/*! generate a cell channel list as per Section 10.5.2.22 of 04.08
* \param[out] chan_list caller-provided output buffer
* \param[in] bts BTS descriptor used for input data
* \param[in] si5 Are we generating SI5xxx (true) or SI2xxx (false)
* \param[in] bis Are we generating SIXbis (true) or not (false)
* \param[in] ter Are we generating SIXter (true) or not (false)
*/
static int generate_bcch_chan_list(uint8_t *chan_list, struct gsm_bts *bts,
bool si5, bool bis, bool ter)
{
struct gsm_bts *cur_bts;
struct bitvec *bv;
int rc;
/* first we generate a bitvec of the BCCH ARFCN's in our BSC */
if (si5 && bts->neigh_list_manual_mode == NL_MODE_MANUAL_SI5SEP)
bv = &bts->si_common.si5_neigh_list;
else
bv = &bts->si_common.neigh_list;
/* Generate list of neighbor cells if we are in automatic mode */
if (bts->neigh_list_manual_mode == NL_MODE_AUTOMATIC) {
/* Zero-initialize the bit-vector */
memset(bv->data, 0, bv->data_len);
if (llist_empty(&bts->neighbors)) {
/* There are no explicit neighbors, assume all BTS are. */
llist_for_each_entry(cur_bts, &bts->network->bts_list, list) {
if (cur_bts == bts)
continue;
bitvec_set_bit_pos(bv, cur_bts->c0->arfcn, 1);
}
} else {
/* Only add explicit neighbor cells */
struct neighbor *n;
llist_for_each_entry(n, &bts->neighbors, entry) {
if (n->type == NEIGHBOR_TYPE_CELL_ID && n->cell_id.ab_present) {
bitvec_set_bit_pos(bv, n->cell_id.ab.arfcn, 1);
} else {
struct gsm_bts *neigh_bts;
if (resolve_local_neighbor(&neigh_bts, bts, n)) {
LOGP(DHO, LOGL_ERROR,
"Neither local nor remote neighbor: BTS %u -> %s\n",
bts->nr, neighbor_to_str_c(OTC_SELECT, n));
continue;
}
if (neigh_bts->c0)
bitvec_set_bit_pos(bv, neigh_bts->c0->arfcn, 1);
}
}
}
}
/* then we generate a GSM 04.08 frequency list from the bitvec */
rc = bitvec2freq_list(chan_list, bv, bts, bis, ter);
if (rc < 0)
return rc;
/* Set BA-IND depending on whether we're generating SI2 or SI5.
* The point here is to be able to correlate whether a given MS
* measurement report was using the neighbor cells advertised in
* SI2 or in SI5, as those two could very well be different */
if (si5)
chan_list[0] |= 0x10;
else
chan_list[0] &= ~0x10;
return rc;
}
static int list_arfcn(uint8_t *chan_list, uint8_t mask, char *text)
{
int n = 0, i;
struct gsm_sysinfo_freq freq[1024];
memset(freq, 0, sizeof(freq));
gsm48_decode_freq_list(freq, chan_list, 16, mask, 1);
for (i = 0; i < 1024; i++) {
if (freq[i].mask) {
if (!n)
LOGP(DRR, LOGL_INFO, "%s", text);
LOGPC(DRR, LOGL_INFO, " %d", i);
n++;
}
}
if (n)
LOGPC(DRR, LOGL_INFO, "\n");
return n;
}
static int generate_si1(enum osmo_sysinfo_type t, struct gsm_bts *bts)
{
int rc;
struct gsm48_system_information_type_1 *si1 = (struct gsm48_system_information_type_1 *) GSM_BTS_SI(bts, t);
memset(si1, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
si1->header.l2_plen = GSM48_LEN2PLEN(21);
si1->header.rr_protocol_discriminator = GSM48_PDISC_RR;
si1->header.skip_indicator = 0;
si1->header.system_information = GSM48_MT_RR_SYSINFO_1;
rc = generate_cell_chan_list(si1->cell_channel_description, bts);
if (rc < 0)
return rc;
list_arfcn(si1->cell_channel_description, 0xce, "Serving cell:");
si1->rach_control = bts->si_common.rach_control;
acc_mgr_apply_acc(&bts->acc_mgr, &si1->rach_control);
/*
* SI1 Rest Octets (10.5.2.32), contains NCH position and band
* indicator but that is not in the 04.08.
*/
if (bts->nch.num_blocks) {
rc = osmo_gsm48_si1ro_nch_pos_encode(bts->nch.num_blocks, bts->nch.first_block);
if (rc < 0) {
LOGP(DRR, LOGL_ERROR, "Unable to encode NCH position (num_blocks=%u, first_block=%u)\n",
bts->nch.num_blocks, bts->nch.first_block);
rc = osmo_gsm48_rest_octets_si1_encode(si1->rest_octets, NULL, is_dcs_net(bts));
} else {
uint8_t nch_pos = rc;
rc = osmo_gsm48_rest_octets_si1_encode(si1->rest_octets, &nch_pos, is_dcs_net(bts));
}
} else {
rc = osmo_gsm48_rest_octets_si1_encode(si1->rest_octets, NULL, is_dcs_net(bts));
}
return sizeof(*si1) + rc;
}
static int generate_si2(enum osmo_sysinfo_type t, struct gsm_bts *bts)
{
int rc;
struct gsm48_system_information_type_2 *si2 = (struct gsm48_system_information_type_2 *) GSM_BTS_SI(bts, t);
memset(si2, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
si2->header.l2_plen = GSM48_LEN2PLEN(22);
si2->header.rr_protocol_discriminator = GSM48_PDISC_RR;
si2->header.skip_indicator = 0;
si2->header.system_information = GSM48_MT_RR_SYSINFO_2;
rc = generate_bcch_chan_list(si2->bcch_frequency_list, bts, false, false, false);
if (rc < 0)
return rc;
list_arfcn(si2->bcch_frequency_list, 0xce,
"SI2 Neighbour cells in same band:");
si2->ncc_permitted = bts->si_common.ncc_permitted;
si2->rach_control = bts->si_common.rach_control;
acc_mgr_apply_acc(&bts->acc_mgr, &si2->rach_control);
return sizeof(*si2);
}
/* Generate SI2bis Rest Octests 3GPP TS 44.018 Table 10.5.2.33.1 */
static int rest_octets_si2bis(uint8_t *data)
{
struct bitvec bv;
memset(&bv, 0, sizeof(bv));
bv.data = data;
bv.data_len = 1;
bitvec_spare_padding(&bv, (bv.data_len * 8) - 1);
return bv.data_len;
}
static int generate_si2bis(enum osmo_sysinfo_type t, struct gsm_bts *bts)
{
int rc;
struct gsm48_system_information_type_2bis *si2b =
(struct gsm48_system_information_type_2bis *) GSM_BTS_SI(bts, t);
int n;
memset(si2b, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
si2b->header.l2_plen = GSM48_LEN2PLEN(21);
si2b->header.rr_protocol_discriminator = GSM48_PDISC_RR;
si2b->header.skip_indicator = 0;
si2b->header.system_information = GSM48_MT_RR_SYSINFO_2bis;
rc = generate_bcch_chan_list(si2b->bcch_frequency_list, bts, false, true, false);
if (rc < 0)
return rc;
n = list_arfcn(si2b->bcch_frequency_list, 0xce,
"SI2bis Neighbour cells in same band, but outside P-GSM:");
if (n) {
/* indicate in SI2 and SI2bis: there is an extension */
struct gsm48_system_information_type_2 *si2 =
(struct gsm48_system_information_type_2 *) GSM_BTS_SI(bts, SYSINFO_TYPE_2);
si2->bcch_frequency_list[0] |= 0x20;
si2b->bcch_frequency_list[0] |= 0x20;
} else
bts->si_valid &= ~(1 << SYSINFO_TYPE_2bis);
si2b->rach_control = bts->si_common.rach_control;
acc_mgr_apply_acc(&bts->acc_mgr, &si2b->rach_control);
/* SI2bis Rest Octets as per 3GPP TS 44.018 §10.5.2.33 */
rc = rest_octets_si2bis(si2b->rest_octets);
return sizeof(*si2b) + rc;
}
/* Generate SI2ter Rest Octests 3GPP TS 44.018 Table 10.5.2.33a.1 */
static int rest_octets_si2ter(uint8_t *data)
{
struct bitvec bv;
memset(&bv, 0, sizeof(bv));
bv.data = data;
bv.data_len = 4;
/* No SI2ter_MP_CHANGE_MARK */
bitvec_set_bit(&bv, L);
bitvec_spare_padding(&bv, (bv.data_len * 8) - 1);
return bv.data_len;
}
static int generate_si2ter(enum osmo_sysinfo_type t, struct gsm_bts *bts)
{
int rc;
struct gsm48_system_information_type_2ter *si2t =
(struct gsm48_system_information_type_2ter *) GSM_BTS_SI(bts, t);
int n;
memset(si2t, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
si2t->header.l2_plen = GSM48_LEN2PLEN(18);
si2t->header.rr_protocol_discriminator = GSM48_PDISC_RR;
si2t->header.skip_indicator = 0;
si2t->header.system_information = GSM48_MT_RR_SYSINFO_2ter;
rc = generate_bcch_chan_list(si2t->ext_bcch_frequency_list, bts, false, false, true);
if (rc < 0)
return rc;
n = list_arfcn(si2t->ext_bcch_frequency_list, 0x8e,
"SI2ter Neighbour cells in different band:");
if (!n)
bts->si_valid &= ~(1 << SYSINFO_TYPE_2ter);
/* SI2ter Rest Octets as per 3GPP TS 44.018 §10.5.2.33a */
rc = rest_octets_si2ter(si2t->rest_octets);
return sizeof(*si2t) + rc;
}
/* SI2quater messages are optional - we only generate them when neighbor UARFCNs or EARFCNs are configured */
static inline bool si2quater_not_needed(struct gsm_bts *bts)
{
unsigned i = MAX_EARFCN_LIST;
if (bts->si_common.si2quater_neigh_list.arfcn)
for (i = 0; i < MAX_EARFCN_LIST; i++)
if (bts->si_common.si2quater_neigh_list.arfcn[i] != OSMO_EARFCN_INVALID)
break;
if (!bts->si_common.uarfcn_length && i == MAX_EARFCN_LIST) {
bts->si_valid &= ~(1 << SYSINFO_TYPE_2quater); /* mark SI2q as invalid if no (E|U)ARFCNs are present */
return true;
}
return false;
}
static int generate_si2quater(enum osmo_sysinfo_type t, struct gsm_bts *bts)
{
int rc;
struct gsm48_system_information_type_2quater *si2q;
if (si2quater_not_needed(bts)) /* generate rest_octets for SI2q only when necessary */
return GSM_MACBLOCK_LEN;
bts->u_offset = 0;
bts->e_offset = 0;
bts->si2q_index = 0;
bts->si2q_count = si2q_num(bts) - 1;
rc = make_si2quaters(bts, false);
if (rc < 0)
return rc;
OSMO_ASSERT(bts->si2q_count == bts->si2q_index);
OSMO_ASSERT(bts->si2q_count <= SI2Q_MAX_NUM);
return sizeof(*si2q) + rc;
}
static struct osmo_gsm48_si_ro_info si_info = {
.selection_params = {
.present = 0,
},
.power_offset = {
.present = 0,
},
.si2ter_indicator = false,
.early_cm_ctrl = true,
.scheduling = {
.present = 0,
},
.gprs_ind = {
.si13_position = 0,
.ra_colour = 0,
.present = 1,
},
.early_cm_restrict_3g = false,
.si2quater_indicator = false,
.lsa_params = {
.present = 0,
},
.cell_id = 0, /* FIXME: doesn't the bts have this? */
.break_ind = 0,
};
static int generate_si3(enum osmo_sysinfo_type t, struct gsm_bts *bts)
{
int rc;
struct gsm48_system_information_type_3 *si3 = (struct gsm48_system_information_type_3 *) GSM_BTS_SI(bts, t);
memset(si3, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
si3->header.l2_plen = GSM48_LEN2PLEN(18);
si3->header.rr_protocol_discriminator = GSM48_PDISC_RR;
si3->header.skip_indicator = 0;
si3->header.system_information = GSM48_MT_RR_SYSINFO_3;
/* The value in bts->si_common.chan_desc may get out of sync with the actual value
* in net->T_defs (e.g. after changing it via the VTY), so we need to sync it here. */
bts->si_common.chan_desc.t3212 = osmo_tdef_get(bts->network->T_defs, 3212, OSMO_TDEF_CUSTOM, 0);
si3->cell_identity = htons(bts->cell_identity);
gsm48_generate_lai2(&si3->lai, bts_lai(bts));
si3->control_channel_desc = bts->si_common.chan_desc;
si3->cell_options = bts->si_common.cell_options;
si3->cell_sel_par = bts->si_common.cell_sel_par;
si3->rach_control = bts->si_common.rach_control;
acc_mgr_apply_acc(&bts->acc_mgr, &si3->rach_control);
/* allow/disallow DTXu */
gsm48_set_dtx(&si3->cell_options, bts->dtxu, bts->dtxu, true);
if (GSM_BTS_HAS_SI(bts, SYSINFO_TYPE_2ter)) {
LOGP(DRR, LOGL_INFO, "SI 2ter is included.\n");
si_info.si2ter_indicator = true;
} else {
si_info.si2ter_indicator = false;
}
if (GSM_BTS_HAS_SI(bts, SYSINFO_TYPE_2quater)) {
LOGP(DRR, LOGL_INFO, "SI 2quater is included, based on %zu EARFCNs and %zu UARFCNs.\n",
si2q_earfcn_count(&bts->si_common.si2quater_neigh_list), bts->si_common.uarfcn_length);
si_info.si2quater_indicator = true;
} else {
si_info.si2quater_indicator = false;
}
si_info.early_cm_ctrl = bts->early_classmark_allowed;
si_info.early_cm_restrict_3g = !bts->early_classmark_allowed_3g;
/* SI3 Rest Octets (10.5.2.34), containing
CBQ, CELL_RESELECT_OFFSET, TEMPORARY_OFFSET, PENALTY_TIME
Power Offset, 2ter Indicator, Early Classmark Sending,
Scheduling if and WHERE, GPRS Indicator, SI13 position */
rc = osmo_gsm48_rest_octets_si3_encode(si3->rest_octets, &si_info);
return sizeof(*si3) + rc;
}
static int generate_si4(enum osmo_sysinfo_type t, struct gsm_bts *bts)
{
int rc;
struct gsm48_system_information_type_4 *si4 = (struct gsm48_system_information_type_4 *) GSM_BTS_SI(bts, t);
struct gsm_lchan *cbch_lchan;
uint8_t *tail = si4->data;
/* length of all IEs present except SI4 rest octets and l2_plen */
int l2_plen = sizeof(*si4) - 1;
memset(si4, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
si4->header.rr_protocol_discriminator = GSM48_PDISC_RR;
si4->header.skip_indicator = 0;
si4->header.system_information = GSM48_MT_RR_SYSINFO_4;
gsm48_generate_lai2(&si4->lai, bts_lai(bts));
si4->cell_sel_par = bts->si_common.cell_sel_par;
si4->rach_control = bts->si_common.rach_control;
acc_mgr_apply_acc(&bts->acc_mgr, &si4->rach_control);
/* Optional: CBCH Channel Description + CBCH Mobile Allocation */
cbch_lchan = gsm_bts_get_cbch(bts);
if (cbch_lchan) {
const struct gsm_bts_trx_ts *ts = cbch_lchan->ts;
struct gsm48_chan_desc cd;
/* 10.5.2.5 (TV) CBCH Channel Description IE.
* CBCH is never in VAMOS mode, so just pass allow_osmo_cbits == false. */
if (gsm48_lchan_and_pchan2chan_desc(&cd, cbch_lchan, cbch_lchan->ts->pchan_from_config,
gsm_ts_tsc(cbch_lchan->ts), false))
return -EINVAL;
tail = tv_fixed_put(tail, GSM48_IE_CBCH_CHAN_DESC,
sizeof(cd), (uint8_t *) &cd);
l2_plen += 1 + sizeof(cd);
/* 10.5.2.21 (TLV) CBCH Mobile Allocation IE */
if (ts->hopping.enabled) {
/* Prevent potential buffer overflow */
if (ts->hopping.ma_len > 2)
return -ENOMEM;
tail = tlv_put(tail, GSM48_IE_CBCH_MOB_AL,
ts->hopping.ma_len,
ts->hopping.ma_data);
l2_plen += 2 + ts->hopping.ma_len;
}
}
si4->header.l2_plen = GSM48_LEN2PLEN(l2_plen);
/* SI4 Rest Octets (10.5.2.35), containing
Optional Power offset, GPRS Indicator,
Cell Identity, LSA ID, Selection Parameter */
rc = osmo_gsm48_rest_octets_si4_encode(tail, &si_info, (uint8_t *)GSM_BTS_SI(bts, t) + GSM_MACBLOCK_LEN - tail);
return l2_plen + 1 + rc;
}
static int generate_si5(enum osmo_sysinfo_type t, struct gsm_bts *bts)
{
struct gsm48_system_information_type_5 *si5;
uint8_t *output = GSM_BTS_SI(bts, t);
int rc, l2_plen = 18;
memset(output, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
/* Abis/IP needs l2_plen!! */
if (is_ipa_abisip_bts(bts)) {
*output++ = GSM48_LEN2PLEN(l2_plen);
l2_plen++;
}
si5 = (struct gsm48_system_information_type_5 *) output;
/* l2 pseudo length, not part of msg: 18 */
si5->rr_protocol_discriminator = GSM48_PDISC_RR;
si5->skip_indicator = 0;
si5->system_information = GSM48_MT_RR_SYSINFO_5;
rc = generate_bcch_chan_list(si5->bcch_frequency_list, bts, true, false, false);
if (rc < 0)
return rc;
list_arfcn(si5->bcch_frequency_list, 0xce,
"SI5 Neighbour cells in same band:");
/* 04.08 9.1.37: L2 Pseudo Length of 18 */
return l2_plen;
}
static int generate_si5bis(enum osmo_sysinfo_type t, struct gsm_bts *bts)
{
struct gsm48_system_information_type_5bis *si5b;
uint8_t *output = GSM_BTS_SI(bts, t);
int rc, l2_plen = 18;
int n;
memset(output, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
/* Abis/IP needs l2_plen!! */
if (is_ipa_abisip_bts(bts)) {
*output++ = GSM48_LEN2PLEN(l2_plen);
l2_plen++;
}
si5b = (struct gsm48_system_information_type_5bis *) output;
/* l2 pseudo length, not part of msg: 18 */
si5b->rr_protocol_discriminator = GSM48_PDISC_RR;
si5b->skip_indicator = 0;
si5b->system_information = GSM48_MT_RR_SYSINFO_5bis;
rc = generate_bcch_chan_list(si5b->bcch_frequency_list, bts, true, true, false);
if (rc < 0)
return rc;
n = list_arfcn(si5b->bcch_frequency_list, 0xce,
"SI5bis Neighbour cells in same band, but outside P-GSM:");
if (n) {
/* indicate in SI5 and SI5bis: there is an extension */
struct gsm48_system_information_type_5 *si5 =
(struct gsm48_system_information_type_5 *) GSM_BTS_SI(bts, SYSINFO_TYPE_5)+1;
si5->bcch_frequency_list[0] |= 0x20;
si5b->bcch_frequency_list[0] |= 0x20;
} else
bts->si_valid &= ~(1 << SYSINFO_TYPE_5bis);
/* 04.08 9.1.37: L2 Pseudo Length of 18 */
return l2_plen;
}
static int generate_si5ter(enum osmo_sysinfo_type t, struct gsm_bts *bts)
{
struct gsm48_system_information_type_5ter *si5t;
uint8_t *output = GSM_BTS_SI(bts, t);
int rc, l2_plen = 18;
int n;
memset(output, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
/* Abis/IP needs l2_plen!! */
if (is_ipa_abisip_bts(bts)) {
*output++ = GSM48_LEN2PLEN(l2_plen);
l2_plen++;
}
si5t = (struct gsm48_system_information_type_5ter *) output;
/* l2 pseudo length, not part of msg: 18 */
si5t->rr_protocol_discriminator = GSM48_PDISC_RR;
si5t->skip_indicator = 0;
si5t->system_information = GSM48_MT_RR_SYSINFO_5ter;
rc = generate_bcch_chan_list(si5t->bcch_frequency_list, bts, true, false, true);
if (rc < 0)
return rc;
n = list_arfcn(si5t->bcch_frequency_list, 0x8e,
"SI5ter Neighbour cells in different band:");
if (!n)
bts->si_valid &= ~(1 << SYSINFO_TYPE_5ter);
/* 04.08 9.1.37: L2 Pseudo Length of 18 */
return l2_plen;
}
static int generate_si6(enum osmo_sysinfo_type t, struct gsm_bts *bts)
{
struct gsm48_system_information_type_6 *si6;
struct osmo_gsm48_si6_ro_info si6_ro_info;
uint8_t *output = GSM_BTS_SI(bts, t);
int l2_plen = 11;
int rc;
memset(output, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
memset(&si6_ro_info, 0, sizeof(si6_ro_info));
/* Abis/IP needs l2_plen!! */
if (is_ipa_abisip_bts(bts)) {
*output++ = GSM48_LEN2PLEN(l2_plen);
l2_plen++;
}
si6 = (struct gsm48_system_information_type_6 *) output;
/* l2 pseudo length, not part of msg: 11 */
si6->rr_protocol_discriminator = GSM48_PDISC_RR;
si6->skip_indicator = 0;
si6->system_information = GSM48_MT_RR_SYSINFO_6;
si6->cell_identity = htons(bts->cell_identity);
gsm48_generate_lai2(&si6->lai, bts_lai(bts));
si6->cell_options = bts->si_common.cell_options;
si6->ncc_permitted = bts->si_common.ncc_permitted;
/* allow/disallow DTXu */
gsm48_set_dtx(&si6->cell_options, bts->dtxu, bts->dtxu, false);
/* SI6 Rest Octets: 10.5.2.35a: PCH / NCH info, VBS/VGCS options */
si6_ro_info.band_indicator_1900 = !is_dcs_net(bts);
rc = osmo_gsm48_rest_octets_si6_encode(si6->rest_octets, &si6_ro_info);
return l2_plen + rc;
}
static int si10_rest_octets_encode(struct gsm_bts *s_bts, struct bitvec *bv, struct gsm_bts *n_bts, uint8_t index)
{
/* The BA-IND must be equal to the BA-IND in SI5*. */
/* <BA ind : bit(1)> */
bitvec_set_bit(bv, 1);
/* Do we have neighbor cells ? */
/* { L <spare padding> | H <neighbour information> } */
if (!n_bts)
return 0;
bitvec_set_bit(bv, H);
/* <first frequency: bit(5)> */
bitvec_set_uint(bv, index, 5);
/* <bsic : bit(6)> */
bitvec_set_uint(bv, n_bts->bsic, 6);
/* We do not provide empty cell information. */
/* { H <cell parameters> | L } */
bitvec_set_bit(bv, H);
/* If cell is barred, we do not need further cell info. */
/* <cell barred> | L <further cell info> */
if (n_bts->si_common.rach_control.cell_bar) {
/* H */
bitvec_set_bit(bv, H);
/* We are done with the first cell info. */
return 0;
}
bitvec_set_bit(bv, L);
/* If LA is different for serving cell, we need to add CRH. */
/* { H <cell reselect hysteresis : bit(3)> | L } */
if (s_bts->location_area_code != n_bts->location_area_code) {
bitvec_set_bit(bv, H);
bitvec_set_uint(bv, n_bts->si_common.cell_sel_par.cell_resel_hyst, 3);
} else
bitvec_set_bit(bv, L);
/* <ms txpwr max cch : bit(5)> */
bitvec_set_uint(bv, n_bts->si_common.cell_sel_par.ms_txpwr_max_ccch, 5);
/* <rxlev access min : bit(6)> */
bitvec_set_uint(bv, n_bts->si_common.cell_sel_par.rxlev_acc_min, 6);
/* <cell reselect offset : bit(6)> */
if (n_bts->si_common.cell_ro_sel_par.present)
bitvec_set_uint(bv, n_bts->si_common.cell_ro_sel_par.cell_resel_off, 6);
else
bitvec_set_uint(bv, 0, 6);
/* <temporary offset : bit(3)> */
if (n_bts->si_common.cell_ro_sel_par.present)
bitvec_set_uint(bv, n_bts->si_common.cell_ro_sel_par.temp_offs, 3);
else
bitvec_set_uint(bv, 0, 3);
/* <penalty time : bit(5)> */
if (n_bts->si_common.cell_ro_sel_par.present)
bitvec_set_uint(bv, n_bts->si_common.cell_ro_sel_par.penalty_time, 5);
else
bitvec_set_uint(bv, 0, 5);
/* We are done with the first cell info. */
return 0;
}
static int si10_rest_octets_encode_other(struct gsm_bts *s_bts, struct bitvec *bv, struct gsm_bts *l_bts,
struct gsm_bts *n_bts, uint8_t last_index, uint8_t index)
{
int rc;
/* If the bv buffer would overflow, then the bits are not written. Each bitvec_set_* call will return
* an error code. This error is returned with this function. */
/* { H <info field> } */
bitvec_set_bit(bv, H);
/* How many frequency indices do we skip? */
/* <next frequency>** L <differential cell info> */
while ((last_index = (last_index + 1) & 0x1f) != index) {
/* H */
bitvec_set_bit(bv, H);
}
bitvec_set_bit(bv, L);
/* If NCC is equal, just send BCC, otherwise send complete BSIC. */
/* { H <BCC : bit(3)> | L <bsic : bit(6)> } */
if ((l_bts->bsic & 0x38) == (n_bts->bsic & 0x38))
bitvec_set_uint(bv, n_bts->bsic & 0x07, 3);
else
bitvec_set_uint(bv, n_bts->bsic, 6);
/* We do not provide empty cell information. */
/* { H <cell parameters> | L } */
bitvec_set_bit(bv, H);
/* If cell is barred, we do not need further cell info. */
/* <cell barred> | L <further cell info> */
if (n_bts->si_common.rach_control.cell_bar) {
/* H */
rc = bitvec_set_bit(bv, H);
/* We are done with the other cell info. */
return rc;
}
bitvec_set_bit(bv, L);
/* If LA is different for serving cell, we need to add CRH. */
/* { H <cell reselect hysteresis : bit(3)> | L } */
if (s_bts->location_area_code != n_bts->location_area_code) {
bitvec_set_bit(bv, H);
bitvec_set_uint(bv, n_bts->si_common.cell_sel_par.cell_resel_hyst, 3);
} else
bitvec_set_bit(bv, L);
/* { H <ms txpwr max cch : bit(5)> | L } */
if (l_bts->si_common.cell_sel_par.ms_txpwr_max_ccch != n_bts->si_common.cell_sel_par.ms_txpwr_max_ccch) {
bitvec_set_bit(bv, H);
bitvec_set_uint(bv, n_bts->si_common.cell_sel_par.ms_txpwr_max_ccch, 5);
} else
bitvec_set_bit(bv, L);
/* { H <rxlev access min : bit(6)> | L } */
if (l_bts->si_common.cell_sel_par.rxlev_acc_min != n_bts->si_common.cell_sel_par.rxlev_acc_min) {
bitvec_set_bit(bv, H);
bitvec_set_uint(bv, n_bts->si_common.cell_sel_par.rxlev_acc_min, 6);
} else
bitvec_set_bit(bv, L);
/* { H <cell reselect offset : bit(6)> | L } */
if (l_bts->si_common.cell_ro_sel_par.present != n_bts->si_common.cell_ro_sel_par.present ||
(n_bts->si_common.cell_ro_sel_par.present &&
l_bts->si_common.cell_ro_sel_par.cell_resel_off != n_bts->si_common.cell_ro_sel_par.cell_resel_off)) {
bitvec_set_bit(bv, H);
if (n_bts->si_common.cell_ro_sel_par.present)
bitvec_set_uint(bv, n_bts->si_common.cell_ro_sel_par.cell_resel_off, 6);
else
bitvec_set_uint(bv, 0, 6);
} else
bitvec_set_bit(bv, L);
/* { H <temporary offset : bit(3)> | L } */
if (l_bts->si_common.cell_ro_sel_par.present != n_bts->si_common.cell_ro_sel_par.present ||
(n_bts->si_common.cell_ro_sel_par.present &&
l_bts->si_common.cell_ro_sel_par.temp_offs != n_bts->si_common.cell_ro_sel_par.temp_offs)) {
bitvec_set_bit(bv, H);
if (n_bts->si_common.cell_ro_sel_par.present)
bitvec_set_uint(bv, n_bts->si_common.cell_ro_sel_par.temp_offs, 3);
else
bitvec_set_uint(bv, 0, 3);
} else
bitvec_set_bit(bv, L);
/* { H <penalty time : bit(5)> | L } */
if (l_bts->si_common.cell_ro_sel_par.present != n_bts->si_common.cell_ro_sel_par.present ||
(n_bts->si_common.cell_ro_sel_par.present &&
l_bts->si_common.cell_ro_sel_par.penalty_time != n_bts->si_common.cell_ro_sel_par.penalty_time)) {
bitvec_set_bit(bv, H);
if (n_bts->si_common.cell_ro_sel_par.present)
rc = bitvec_set_uint(bv, n_bts->si_common.cell_ro_sel_par.penalty_time, 5);
else
rc = bitvec_set_uint(bv, 0, 5);
} else
rc = bitvec_set_bit(bv, L);
/* We are done with the other cell info. */
return rc;
}
/* Generate SI 10 and return the number of bits used in the rest octet. */
int gsm_generate_si10(struct gsm48_system_information_type_10 *si10, size_t len,
const struct gsm_subscriber_connection *conn)
{
struct bitvec *nbv;
struct gsm_bts *s_bts = conn->lchan->ts->trx->bts, *l_bts = NULL;
int i, last_i = -1;
bool any_neighbor = false;
int rc;
struct bitvec bv = {
.data_len = len - sizeof(*si10),
.data = si10->rest_octets,
};
si10->rr_short_pd = 0; /* 3GPP TS 24.007 §11.3.2.1 */
si10->msg_type = GSM48_MT_RR_SH_SI10;
si10->l2_header = 0; /* 3GPP TS 44.006 §6.4a */
/* If we have gernerated SI5 with separate SI5 list, the used frequency indexes refer to it. */
if (s_bts->neigh_list_manual_mode == NL_MODE_MANUAL_SI5SEP)
nbv = &s_bts->si_common.si5_neigh_list;
else
nbv = &s_bts->si_common.neigh_list;
/* Get up to 32 possible neighbor frequencies that SI10 can refer to. */
for (i = 0; i < 32; i++) {
struct gsm_bts *c_bts, *n_bts;
struct gsm_subscriber_connection *c;
unsigned int save_cur_bit;
int16_t arfcn;
arfcn = neigh_list_get_arfcn(s_bts, nbv, i);
/* End of list */
if (arfcn < 0)
break;
/* Is this neighbour used for this group call? */
n_bts = NULL;
llist_for_each_entry(c, &conn->vgcs_chan.call->vgcs_call.chan_list, vgcs_chan.list) {
if (c == conn)
continue;
if (!c->lchan)
continue;
c_bts = c->lchan->ts->trx->bts;
if (c_bts->c0->arfcn != arfcn)
continue;
n_bts = c_bts;
break;
}
if (n_bts) {
if (!any_neighbor) {
/* First neighbor, so generate rest octets with first cell info. */
LOGP(DRR, LOGL_INFO, "SI 10 with cell ID %d.\n", n_bts->cell_identity);
rc = si10_rest_octets_encode(s_bts, &bv, n_bts, i);
if (rc < 0)
return rc;
any_neighbor = true;
} else {
/* Save current position, so we can restore to last position in case of failure. */
save_cur_bit = bv.cur_bit;
/* Nth neighbor, so add rest octets with differential cell info. */
LOGP(DRR, LOGL_INFO, "Append cell ID %d to SI 10.\n", n_bts->cell_identity);
OSMO_ASSERT(l_bts && last_i >= 0);
rc = si10_rest_octets_encode_other(s_bts, &bv, l_bts, n_bts, last_i, i);
if (rc < 0) {
LOGP(DRR, LOGL_INFO, "Skip cell ID %d, SI 10 would overflow.\n",
n_bts->cell_identity);
/* Resore last position. */
bv.cur_bit = save_cur_bit;
break;
}
}
last_i = i;
l_bts = n_bts;
}
}
/* If no neighbor exists, generate rest octets without any neighbor info. */
if (!any_neighbor) {
LOGP(DRR, LOGL_INFO, "SI 10 without any neighbor cell.\n");
rc = si10_rest_octets_encode(s_bts, &bv, NULL, 0);
if (rc < 0)
return rc;
}
/* Do spare padding. We cannot do it earlier, because encoding might corrupt it if differential cell info
* does not fit into the message. */
while ((bv.cur_bit & 7))
bitvec_set_bit(&bv, L);
memset(bv.data + bv.cur_bit / 8, GSM_MACBLOCK_PADDING, bv.data_len - bv.cur_bit / 8);
return len;
}
static int generate_si13(enum osmo_sysinfo_type t, struct gsm_bts *bts)
{
struct gsm48_system_information_type_13 *si13 =
(struct gsm48_system_information_type_13 *) GSM_BTS_SI(bts, t);
struct osmo_gsm48_si13_info si13_info;
int ret;
memset(si13, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
si13->header.rr_protocol_discriminator = GSM48_PDISC_RR;
si13->header.skip_indicator = 0;
si13->header.system_information = GSM48_MT_RR_SYSINFO_13;
si13_info = (struct osmo_gsm48_si13_info){
.cell_opts = {
.nmo = GPRS_NMO_II,
.t3168 = 2000,
.t3192 = 1500,
/* 3GPP TS 45.002 6.5.6:
* "On BCCH, the operator should limit DRX_TIMER_MAX [...] to 4 seconds" */
.drx_timer_max = 4,
.bs_cv_max = 15,
.ctrl_ack_type_use_block = bts->gprs.ctrl_ack_type_use_block,
.ext_info_present = true,
.ext_info = {
.egprs_supported = 0, /* overridden below */
.use_egprs_p_ch_req = 0, /* overridden below */
.bep_period = 5,
.pfc_supported = 0,
.dtm_supported = 0,
.bss_paging_coordination = 0, /* overridden below */
.ccn_active = false, /* overridden below */
},
},
.pwr_ctrl_pars = {
.alpha = bts->gprs.pwr_ctrl.alpha, /* a = 0.0 */
.t_avg_w = 16,
.t_avg_t = 16,
.pc_meas_chan = 0, /* downling measured on CCCH */
.n_avg_i = 8,
},
.bcch_change_mark = bts->bcch_change_mark, /* Information about the other SIs */
.si_change_field = 0,
.rac = bts->gprs.rac,
.spgc_ccch_sup = 0,
.net_ctrl_ord = bts->gprs.net_ctrl_ord,
.prio_acc_thr = 6,
};
switch (bts->gprs.mode) {
case BTS_GPRS_EGPRS:
si13_info.cell_opts.ext_info.egprs_supported = 1;
/* Whether EGPRS capable MSs shall use EGPRS PACKET CHANNEL REQUEST */
if (bts->gprs.egprs_pkt_chan_request)
si13_info.cell_opts.ext_info.use_egprs_p_ch_req = 1;
else
si13_info.cell_opts.ext_info.use_egprs_p_ch_req = 0;
break;
case BTS_GPRS_GPRS:
case BTS_GPRS_NONE:
si13_info.cell_opts.ext_info.egprs_supported = 0;
si13_info.cell_opts.ext_info.use_egprs_p_ch_req = 0;
break;
}
if (osmo_bts_has_feature(&bts->features, BTS_FEAT_PAGING_COORDINATION))
si13_info.cell_opts.ext_info.bss_paging_coordination = 1;
else
si13_info.cell_opts.ext_info.bss_paging_coordination = 0;
si13_info.cell_opts.ext_info.ccn_active = bts->gprs.ccn.forced_vty ?
bts->gprs.ccn.active :
osmo_bts_has_feature(&bts->features, BTS_FEAT_CCN);
ret = osmo_gsm48_rest_octets_si13_encode(si13->rest_octets, &si13_info);
if (ret < 0)
return ret;
/* length is coded in bit 2 an up */
si13->header.l2_plen = 0x01;
return sizeof (*si13) + ret;
}
typedef int (*gen_si_fn_t)(enum osmo_sysinfo_type t, struct gsm_bts *bts);
static const gen_si_fn_t gen_si_fn[_MAX_SYSINFO_TYPE] = {
[SYSINFO_TYPE_1] = &generate_si1,
[SYSINFO_TYPE_2] = &generate_si2,
[SYSINFO_TYPE_2bis] = &generate_si2bis,
[SYSINFO_TYPE_2ter] = &generate_si2ter,
[SYSINFO_TYPE_2quater] = &generate_si2quater,
[SYSINFO_TYPE_3] = &generate_si3,
[SYSINFO_TYPE_4] = &generate_si4,
[SYSINFO_TYPE_5] = &generate_si5,
[SYSINFO_TYPE_5bis] = &generate_si5bis,
[SYSINFO_TYPE_5ter] = &generate_si5ter,
[SYSINFO_TYPE_6] = &generate_si6,
[SYSINFO_TYPE_13] = &generate_si13,
};
int gsm_generate_si(struct gsm_bts *bts, enum osmo_sysinfo_type si_type)
{
int rc;
gen_si_fn_t gen_si;
switch (bts->gprs.mode) {
case BTS_GPRS_EGPRS:
case BTS_GPRS_GPRS:
si_info.gprs_ind.present = 1;
break;
case BTS_GPRS_NONE:
si_info.gprs_ind.present = 0;
break;
}
memcpy(&si_info.selection_params,
&bts->si_common.cell_ro_sel_par,
sizeof(struct osmo_gsm48_si_selection_params));
gen_si = gen_si_fn[si_type];
if (!gen_si) {
LOGP(DRR, LOGL_ERROR, "bts %u: no gen_si_fn() for SI%s\n",
bts->nr, get_value_string(osmo_sitype_strs, si_type));
return -EINVAL;
}
rc = gen_si(si_type, bts);
if (rc < 0)
LOGP(DRR, LOGL_ERROR, "bts %u: Error while generating SI%s: %s (%d)\n",
bts->nr, get_value_string(osmo_sitype_strs, si_type), strerror(-rc), rc);
return rc;
}
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