diff options
Diffstat (limited to 'include/openbsc/bsc_nat_sccp.h')
-rw-r--r-- | include/openbsc/bsc_nat_sccp.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/include/openbsc/bsc_nat_sccp.h b/include/openbsc/bsc_nat_sccp.h new file mode 100644 index 000000000..082466408 --- /dev/null +++ b/include/openbsc/bsc_nat_sccp.h @@ -0,0 +1,105 @@ +/* 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 |