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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 <sys/types.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;
+
+ /* 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 sccp_connections {
+ 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_type;
+ int con_local;
+ int imsi_checked;
+ char *imsi;
+
+ /*
+ * 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