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/* Group Call Register (GCR) */
/*
* (C) 2023 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* SPDX-License-Identifier: AGPL-3.0+
*
* Author: Andreas Eversberg
*
* 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 <osmocom/msc/gsm_data.h>
#include <osmocom/msc/transaction.h>
#include <osmocom/msc/asci_gcr.h>
#define GCR_DEFAULT_TIMEOUT 60
static uint32_t pow10[9] = { 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000 };
/* Add cell to BSS list. */
struct gcr_cell *gcr_add_cell(struct gcr_bss *bss, uint16_t cell_id)
{
struct gcr_cell *c;
c = talloc_zero(bss, struct gcr_cell);
if (!c)
return NULL;
c->cell_id = cell_id;
llist_add_tail(&c->list, &bss->cell_list);
return c;
}
/* Find cell entry in BSS list. */
struct gcr_cell *gcr_find_cell(struct gcr_bss *bss, uint16_t cell_id)
{
struct gcr_cell *c;
llist_for_each_entry(c, &bss->cell_list, list) {
if (c->cell_id == cell_id)
return c;
}
return NULL;
}
/* Remove cell entry from BSS list. */
void gcr_rm_cell(struct gcr_bss *bss, uint16_t cell_id)
{
struct gcr_cell *c = gcr_find_cell(bss, cell_id);
if (c) {
llist_del(&c->list);
talloc_free(c);
}
}
/* Add BSS to GCR list. */
struct gcr_bss *gcr_add_bss(struct gcr *gcr, int pc)
{
struct gcr_bss *b;
b = talloc_zero(gcr, struct gcr_bss);
if (!b)
return NULL;
INIT_LLIST_HEAD(&b->cell_list);
b->pc = pc;
llist_add_tail(&b->list, &gcr->bss_list);
return b;
}
/* Find BSS entry in GCR list. */
struct gcr_bss *gcr_find_bss(struct gcr *gcr, int pc)
{
struct gcr_bss *b;
llist_for_each_entry(b, &gcr->bss_list, list) {
if (b->pc == pc)
return b;
}
return NULL;
}
/* Remove BSS entry from GCR list. */
void gcr_rm_bss(struct gcr *gcr, int pc)
{
struct gcr_bss *b = gcr_find_bss(gcr, pc);
if (b) {
/* All cell definitons will be removed, as they are attached to BSS. */
llist_del(&b->list);
talloc_free(b);
}
}
/* Create a new (empty) GCR list. */
struct gcr *gcr_create(struct gsm_network *gsmnet, enum trans_type trans_type, const char *group_id)
{
struct gcr *gcr;
gcr = talloc_zero(gsmnet, struct gcr);
if (!gcr)
return NULL;
INIT_LLIST_HEAD(&gcr->bss_list);
gcr->trans_type = trans_type;
gcr->timeout = GCR_DEFAULT_TIMEOUT;
gcr->mute_talker = true;
osmo_strlcpy(gcr->group_id, group_id, sizeof(gcr->group_id));
llist_add_tail(&gcr->list, &gsmnet->asci.gcr_lists);
return gcr;
}
/* Destroy a GCR list. */
void gcr_destroy(struct gcr *gcr)
{
/* All BSS definitons will be removed, as they are attached to GCR. */
llist_del(&gcr->list);
talloc_free(gcr);
}
/* Find GCR list by group ID. */
struct gcr *gcr_by_group_id(struct gsm_network *gsmnet, enum trans_type trans_type, const char *group_id)
{
struct gcr *gcr;
llist_for_each_entry(gcr, &gsmnet->asci.gcr_lists, list) {
if (gcr->trans_type == trans_type && !strcmp(gcr->group_id, group_id))
return gcr;
}
return NULL;
}
/* Find GCR list by callref. */
struct gcr *gcr_by_callref(struct gsm_network *gsmnet, enum trans_type trans_type, uint32_t callref)
{
struct gcr *most_specific_gcr = NULL, *gcr;
int a, b;
size_t most_specific_len = 0, l;
llist_for_each_entry(gcr, &gsmnet->asci.gcr_lists, list) {
/* Compare only the digits in Group ID with the digits in callref.
* callref is an integer. Only the remainder, based on Group ID length, is checked. */
l = strlen(gcr->group_id);
a = atoi(gcr->group_id);
OSMO_ASSERT(l < ARRAY_SIZE(pow10));
b = callref % pow10[l];
if (gcr->trans_type == trans_type && a == b) {
/* Get most specific GROUP ID, no matter what order they are stored. */
if (l > most_specific_len) {
most_specific_gcr = gcr;
most_specific_len = l;
}
}
}
return most_specific_gcr;
}
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