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