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/*
* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2010 by on-waves.com
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#ifndef BSC_NAT_H
#define BSC_NAT_H
#include <sys/types.h>
#include <sccp/sccp_types.h>
#include "msgb.h"
#define FILTER_NONE 0
#define FILTER_TO_BSC 1
#define FILTER_TO_MSC 2
#define FILTER_TO_BOTH 3
/*
* 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;
/* 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;
};
/**
* parse the given message into the above structure
*/
struct bsc_nat_parsed *bsc_nat_parse(struct msgb *msg);
/**
* filter based on IP Access header in both directions
*/
int bsc_nat_filter_ipa(struct msgb *msg, struct bsc_nat_parsed *parsed);
#endif
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