65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/* Generic SCCP handling across all OsmoBSC users */
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/*
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* (C) 2020 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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*
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* All Rights Reserved
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*
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* Author: Neels Hofmeyr <neels@hofmeyr.de>
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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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*/
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#include <osmocom/bsc/gsm_data.h>
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#include <osmocom/bsc/bsc_msc_data.h>
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#include <osmocom/bsc/lb.h>
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/* We need an unused SCCP conn_id across all SCCP users. */
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int bsc_sccp_inst_next_conn_id(struct osmo_sccp_instance *sccp)
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{
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static uint32_t next_id = 1;
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int i;
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/* This looks really suboptimal, but in most cases the static next_id should indicate exactly the next unused
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* conn_id, and we only iterate all conns once to make super sure that it is not already in use. */
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for (i = 0; i < 0xFFFFFF; i++) {
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struct gsm_subscriber_connection *conn;
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uint32_t conn_id = next_id;
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bool conn_id_already_used = false;
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next_id = (next_id + 1) & 0xffffff;
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llist_for_each_entry(conn, &bsc_gsmnet->subscr_conns, entry) {
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if (conn->sccp.msc && conn->sccp.msc->a.sccp == sccp) {
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if (conn_id == conn->sccp.conn_id) {
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conn_id_already_used = true;
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break;
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}
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}
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if (bsc_gsmnet->smlc->sccp == sccp
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&& conn->lcs.lb.state != SUBSCR_SCCP_ST_NONE) {
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if (conn_id == conn->lcs.lb.conn_id) {
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conn_id_already_used = true;
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break;
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}
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}
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}
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if (!conn_id_already_used)
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return conn_id;
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}
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return -1;
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}
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