Osmocom's Base Station Controller for 2G mobile networks https://osmocom.org/projects/osmobsc
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osmo-bsc/include/openbsc/bsc_nat_sccp.h

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/* NAT utilities using SCCP types */
/*
* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2010 by On-Waves
* 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/>.
*
*/
#ifndef BSC_NAT_SCCP_H
#define BSC_NAT_SCCP_H
#include "bsc_msg_filter.h"
#include <osmocom/sccp/sccp_types.h>
/*
* For the NAT we will need to analyze and later patch
* the received message. This would require us to parse
* the IPA and SCCP header twice. Instead of doing this
* we will have one analyze structure and have the patching
* and filter operate on the same structure.
*/
struct bsc_nat_parsed {
/* ip access prototype */
int ipa_proto;
/* source local reference */
struct sccp_source_reference *src_local_ref;
/* destination local reference */
struct sccp_source_reference *dest_local_ref;
/* original value */
struct sccp_source_reference original_dest_ref;
/* called ssn number */
int called_ssn;
/* calling ssn number */
int calling_ssn;
/* sccp message type */
int sccp_type;
/* bssap type, e.g. 0 for BSS Management */
int bssap;
/* the gsm0808 message type */
int gsm_type;
};
/*
* Per SCCP source local reference patch table. It needs to
* be updated on new SCCP connections, connection confirm and reject,
* and on the loss of the BSC connection.
*/
struct nat_sccp_connection {
struct llist_head list_entry;
struct bsc_connection *bsc;
struct bsc_msc_connection *msc_con;
struct sccp_source_reference real_ref;
struct sccp_source_reference patched_ref;
struct sccp_source_reference remote_ref;
int has_remote_ref;
/* status */
int con_local;
int authorized;
struct bsc_filter_state filter_state;
uint16_t lac;
uint16_t ci;
/* remember which Transactions we run over the bypass */
char ussd_ti[8];
/*
* audio handling. Remember if we have ever send a CRCX,
* remember the endpoint used by the MSC and BSC.
*/
int msc_endp;
int bsc_endp;
/* timeout handling */
struct timespec creation_time;
};
#endif