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/* BTS support code common to all supported BTS models */
/* (C) 2011 by Andreas Eversberg <jolly@eversberg.eu>
* (C) 2011 by Harald Welte <laforge@gnumonks.org>
*
* 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 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 <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <osmocom/core/select.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/talloc.h>
#include <osmocom/gsm/protocol/gsm_12_21.h>
#include <osmocom/gsm/lapdm.h>
#include <osmocom/trau/osmo_ortp.h>
#include <osmo-bts/logging.h>
#include <osmo-bts/abis.h>
#include <osmo-bts/bts.h>
#include <osmo-bts/bts_model.h>
#include <osmo-bts/rsl.h>
#include <osmo-bts/oml.h>
struct gsm_network bts_gsmnet = {
.bts_list = { &bts_gsmnet.bts_list, &bts_gsmnet.bts_list },
.num_bts = 0,
};
void *tall_bts_ctx;
int bts_init(struct gsm_bts *bts)
{
struct gsm_bts_role_bts *btsb;
struct gsm_bts_trx *trx;
int rc;
/* add to list of BTSs */
llist_add_tail(&bts->list, &bts_gsmnet.bts_list);
bts->band = GSM_BAND_1800;
bts->role = btsb = talloc_zero(bts, struct gsm_bts_role_bts);
INIT_LLIST_HEAD(&btsb->agch_queue);
/* configurable via VTY */
btsb->paging_state = paging_init(btsb, 200, 0);
/* configurable via OML */
btsb->load.ccch.load_ind_period = 112;
load_timer_start(bts);
btsb->rtp_jitter_buf_ms = 100;
btsb->max_ta = 63;
/* default RADIO_LINK_TIMEOUT */
btsb->radio_link_timeout = 32;
/* set BTS to dependency */
oml_mo_state_init(&bts->mo, -1, NM_AVSTATE_DEPENDENCY);
oml_mo_state_init(&bts->gprs.nse.mo, -1, NM_AVSTATE_DEPENDENCY);
oml_mo_state_init(&bts->gprs.cell.mo, -1, NM_AVSTATE_DEPENDENCY);
oml_mo_state_init(&bts->gprs.nsvc[0].mo, -1, NM_AVSTATE_DEPENDENCY);
oml_mo_state_init(&bts->gprs.nsvc[1].mo, -1, NM_AVSTATE_DEPENDENCY);
/* initialize bts data structure */
llist_for_each_entry(trx, &bts->trx_list, list) {
int i;
for (i = 0; i < ARRAY_SIZE(trx->ts); i++) {
struct gsm_bts_trx_ts *ts = &trx->ts[i];
int k;
for (k = 0; k < ARRAY_SIZE(ts->lchan); k++) {
struct gsm_lchan *lchan = &ts->lchan[k];
INIT_LLIST_HEAD(&lchan->dl_tch_queue);
}
}
}
osmo_rtp_init(tall_bts_ctx);
rc = bts_model_init(bts);
if (rc < 0) {
llist_del(&bts->list);
return rc;
}
bts_gsmnet.num_bts++;
return rc;
}
static void shutdown_timer_cb(void *data)
{
fprintf(stderr, "Shutdown timer expired\n");
exit(42);
}
static struct osmo_timer_list shutdown_timer = {
.cb = &shutdown_timer_cb,
};
void bts_shutdown(struct gsm_bts *bts, const char *reason)
{
struct gsm_bts_trx *trx;
if (osmo_timer_pending(&shutdown_timer)) {
LOGP(DOML, LOGL_NOTICE,
"BTS is already being shutdown.\n");
return;
}
LOGP(DOML, LOGL_NOTICE, "Shutting down BTS %u, Reason %s\n",
bts->nr, reason);
llist_for_each_entry(trx, &bts->trx_list, list) {
bts_model_trx_deact_rf(trx);
bts_model_trx_close(trx);
}
/* shedule a timer to make sure select loop logic can run again
* to dispatch any pending primitives */
osmo_timer_schedule(&shutdown_timer, 3, 0);
}
/* main link is established, send status report */
int bts_link_estab(struct gsm_bts *bts)
{
int i, j;
LOGP(DSUM, LOGL_INFO, "Main link established, sending Status'.\n");
/* BTS and SITE MGR are EAABLED, BTS is DEPENDENCY */
oml_tx_state_changed(&bts->site_mgr.mo);
oml_tx_state_changed(&bts->mo);
/* those should all be in DEPENDENCY */
oml_tx_state_changed(&bts->gprs.nse.mo);
oml_tx_state_changed(&bts->gprs.cell.mo);
oml_tx_state_changed(&bts->gprs.nsvc[0].mo);
oml_tx_state_changed(&bts->gprs.nsvc[1].mo);
/* All other objects start off-line until the BTS Model code says otherwise */
for (i = 0; i < bts->num_trx; i++) {
struct gsm_bts_trx *trx = gsm_bts_trx_num(bts, i);
oml_tx_state_changed(&trx->mo);
oml_tx_state_changed(&trx->bb_transc.mo);
for (j = 0; j < ARRAY_SIZE(trx->ts); j++) {
struct gsm_bts_trx_ts *ts = &trx->ts[j];
oml_tx_state_changed(&ts->mo);
}
}
return bts_model_oml_estab(bts);
}
/* RSL link is established, send status report */
int trx_link_estab(struct gsm_bts_trx *trx)
{
struct e1inp_sign_link *link = trx->rsl_link;
uint8_t radio_state = link ? NM_OPSTATE_ENABLED : NM_OPSTATE_DISABLED;
LOGP(DSUM, LOGL_INFO, "RSL link (TRX %02x) state changed to %s, sending Status'.\n",
trx->nr, link ? "up" : "down");
oml_mo_state_chg(&trx->mo, radio_state, NM_AVSTATE_OK);
if (link)
rsl_tx_rf_res(trx);
return 0;
}
int lchan_init_lapdm(struct gsm_lchan *lchan)
{
struct lapdm_channel *lc = &lchan->lapdm_ch;
lapdm_channel_init(lc, LAPDM_MODE_BTS);
lapdm_channel_set_flags(lc, LAPDM_ENT_F_POLLING_ONLY);
lapdm_channel_set_l1(lc, NULL, lchan);
lapdm_channel_set_l3(lc, lapdm_rll_tx_cb, lchan);
return 0;
}
int bts_agch_enqueue(struct gsm_bts *bts, struct msgb *msg)
{
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
/* FIXME: implement max queue length */
msgb_enqueue(&btsb->agch_queue, msg);
return 0;
}
struct msgb *bts_agch_dequeue(struct gsm_bts *bts)
{
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
return msgb_dequeue(&btsb->agch_queue);
}
int bts_supports_cipher(struct gsm_bts_role_bts *bts, int rsl_cipher)
{
int sup;
if (rsl_cipher < 1 || rsl_cipher > 8)
return -ENOTSUP;
/* No encryption is always supported */
if (rsl_cipher == 1)
return 1;
sup = (1 << (rsl_cipher - 2)) & bts->support.ciphers;
return sup > 0;
}
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