176 lines
4.3 KiB
C
176 lines
4.3 KiB
C
/* Group Call Register (GCR) */
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/*
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* (C) 2023 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* SPDX-License-Identifier: AGPL-3.0+
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*
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* Author: Andreas Eversberg
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <osmocom/msc/gsm_data.h>
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#include <osmocom/msc/transaction.h>
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#include <osmocom/msc/asci_gcr.h>
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#define GCR_DEFAULT_TIMEOUT 60
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static uint32_t pow10[9] = { 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000 };
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/* Add cell to BSS list. */
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struct gcr_cell *gcr_add_cell(struct gcr_bss *bss, uint16_t cell_id)
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{
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struct gcr_cell *c;
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c = talloc_zero(bss, struct gcr_cell);
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if (!c)
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return NULL;
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c->cell_id = cell_id;
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llist_add_tail(&c->list, &bss->cell_list);
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return c;
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}
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/* Find cell entry in BSS list. */
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struct gcr_cell *gcr_find_cell(struct gcr_bss *bss, uint16_t cell_id)
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{
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struct gcr_cell *c;
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llist_for_each_entry(c, &bss->cell_list, list) {
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if (c->cell_id == cell_id)
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return c;
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}
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return NULL;
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}
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/* Remove cell entry from BSS list. */
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void gcr_rm_cell(struct gcr_bss *bss, uint16_t cell_id)
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{
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struct gcr_cell *c = gcr_find_cell(bss, cell_id);
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if (c) {
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llist_del(&c->list);
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talloc_free(c);
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}
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}
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/* Add BSS to GCR list. */
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struct gcr_bss *gcr_add_bss(struct gcr *gcr, int pc)
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{
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struct gcr_bss *b;
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b = talloc_zero(gcr, struct gcr_bss);
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if (!b)
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return NULL;
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INIT_LLIST_HEAD(&b->cell_list);
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b->pc = pc;
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llist_add_tail(&b->list, &gcr->bss_list);
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return b;
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}
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/* Find BSS entry in GCR list. */
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struct gcr_bss *gcr_find_bss(struct gcr *gcr, int pc)
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{
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struct gcr_bss *b;
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llist_for_each_entry(b, &gcr->bss_list, list) {
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if (b->pc == pc)
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return b;
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}
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return NULL;
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}
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/* Remove BSS entry from GCR list. */
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void gcr_rm_bss(struct gcr *gcr, int pc)
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{
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struct gcr_bss *b = gcr_find_bss(gcr, pc);
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if (b) {
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/* All cell definitons will be removed, as they are attached to BSS. */
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llist_del(&b->list);
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talloc_free(b);
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}
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}
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/* Create a new (empty) GCR list. */
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struct gcr *gcr_create(struct gsm_network *gsmnet, enum trans_type trans_type, const char *group_id)
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{
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struct gcr *gcr;
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gcr = talloc_zero(gsmnet, struct gcr);
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if (!gcr)
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return NULL;
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INIT_LLIST_HEAD(&gcr->bss_list);
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gcr->trans_type = trans_type;
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gcr->timeout = GCR_DEFAULT_TIMEOUT;
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gcr->mute_talker = true;
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osmo_strlcpy(gcr->group_id, group_id, sizeof(gcr->group_id));
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llist_add_tail(&gcr->list, &gsmnet->asci.gcr_lists);
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return gcr;
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}
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/* Destroy a GCR list. */
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void gcr_destroy(struct gcr *gcr)
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{
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/* All BSS definitons will be removed, as they are attached to GCR. */
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llist_del(&gcr->list);
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talloc_free(gcr);
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}
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/* Find GCR list by group ID. */
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struct gcr *gcr_by_group_id(struct gsm_network *gsmnet, enum trans_type trans_type, const char *group_id)
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{
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struct gcr *gcr;
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llist_for_each_entry(gcr, &gsmnet->asci.gcr_lists, list) {
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if (gcr->trans_type == trans_type && !strcmp(gcr->group_id, group_id))
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return gcr;
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}
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return NULL;
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}
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/* Find GCR list by callref. */
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struct gcr *gcr_by_callref(struct gsm_network *gsmnet, enum trans_type trans_type, uint32_t callref)
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{
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struct gcr *most_specific_gcr = NULL, *gcr;
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int a, b;
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size_t most_specific_len = 0, l;
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llist_for_each_entry(gcr, &gsmnet->asci.gcr_lists, list) {
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/* Compare only the digits in Group ID with the digits in callref.
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* callref is an integer. Only the remainder, based on Group ID length, is checked. */
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l = strlen(gcr->group_id);
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a = atoi(gcr->group_id);
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OSMO_ASSERT(l < ARRAY_SIZE(pow10));
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b = callref % pow10[l];
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if (gcr->trans_type == trans_type && a == b) {
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/* Get most specific GROUP ID, no matter what order they are stored. */
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if (l > most_specific_len) {
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most_specific_gcr = gcr;
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most_specific_len = l;
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}
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}
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}
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return most_specific_gcr;
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}
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