| /* 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 |