| /* |
| * (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 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 "mgcp.h" |
| |
| #include <sys/types.h> |
| #include <sccp/sccp_types.h> |
| |
| #include <osmocore/select.h> |
| #include <osmocore/msgb.h> |
| #include <osmocore/timer.h> |
| #include <osmocore/write_queue.h> |
| #include <osmocore/statistics.h> |
| |
| #define DIR_BSC 1 |
| #define DIR_MSC 2 |
| |
| #define NAT_IPAC_PROTO_MGCP 0xfc |
| |
| struct bsc_nat; |
| |
| /* |
| * 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 BSC data structure |
| */ |
| struct bsc_connection { |
| struct llist_head list_entry; |
| |
| /* do we know anything about this BSC? */ |
| int authenticated; |
| |
| /* the fd we use to communicate */ |
| struct write_queue write_queue; |
| |
| /* the BSS associated */ |
| struct bsc_config *cfg; |
| |
| /* a timeout node */ |
| struct timer_list id_timeout; |
| |
| /* a back pointer */ |
| struct bsc_nat *nat; |
| }; |
| |
| /* |
| * 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 sccp_source_reference real_ref; |
| struct sccp_source_reference patched_ref; |
| struct sccp_source_reference remote_ref; |
| |
| /* GSM audio handling. That is 32 * multiplex + ts */ |
| int msc_timeslot; |
| int bsc_timeslot; |
| }; |
| |
| /** |
| * Stats per BSC |
| */ |
| struct bsc_config_stats { |
| struct { |
| struct counter *conn; |
| struct counter *calls; |
| } sccp; |
| |
| struct { |
| struct counter *reconn; |
| } net; |
| }; |
| |
| /** |
| * One BSC entry in the config |
| */ |
| struct bsc_config { |
| struct llist_head entry; |
| |
| char *token; |
| unsigned int lac; |
| int nr; |
| |
| struct bsc_nat *nat; |
| |
| struct bsc_config_stats stats; |
| }; |
| |
| /** |
| * BSCs point of view of endpoints |
| */ |
| struct bsc_endpoint { |
| /* the pending transaction id */ |
| char *transaction_id; |
| /* the bsc we are talking to */ |
| struct bsc_connection *bsc; |
| /* pending delete */ |
| int pending_delete; |
| }; |
| |
| /** |
| * Statistic for the nat. |
| */ |
| struct bsc_nat_statistics { |
| struct { |
| struct counter *conn; |
| struct counter *calls; |
| } sccp; |
| |
| struct { |
| struct counter *reconn; |
| struct counter *auth_fail; |
| } bsc; |
| |
| struct { |
| struct counter *reconn; |
| } msc; |
| }; |
| |
| /** |
| * the structure of the "nat" network |
| */ |
| struct bsc_nat { |
| /* active SCCP connections that need patching */ |
| struct llist_head sccp_connections; |
| |
| /* active BSC connections that need patching */ |
| struct llist_head bsc_connections; |
| |
| /* known BSC's */ |
| struct llist_head bsc_configs; |
| int num_bsc; |
| |
| /* MGCP config */ |
| struct mgcp_config *mgcp_cfg; |
| struct write_queue mgcp_queue; |
| u_int8_t mgcp_msg[4096]; |
| int mgcp_length; |
| |
| /* msc things */ |
| int first_contact; |
| |
| struct bsc_endpoint *bsc_endpoints; |
| |
| /* statistics */ |
| struct bsc_nat_statistics stats; |
| }; |
| |
| /* create and init the structures */ |
| struct bsc_config *bsc_config_alloc(struct bsc_nat *nat, const char *token, unsigned int lac); |
| struct bsc_config *bsc_config_num(struct bsc_nat *nat, int num); |
| struct bsc_nat *bsc_nat_alloc(void); |
| struct bsc_connection *bsc_connection_alloc(struct bsc_nat *nat); |
| |
| void sccp_connection_destroy(struct sccp_connections *); |
| |
| /** |
| * 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(int direction, struct msgb *msg, struct bsc_nat_parsed *parsed); |
| int bsc_nat_vty_init(struct bsc_nat *nat); |
| struct bsc_connection *bsc_nat_find_bsc(struct bsc_nat *nat, struct msgb *msg); |
| |
| /** |
| * SCCP patching and handling |
| */ |
| int create_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed); |
| int update_sccp_src_ref(struct sccp_connections *sccp, struct bsc_nat_parsed *parsed); |
| void remove_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed); |
| struct sccp_connections *patch_sccp_src_ref_to_bsc(struct msgb *, struct bsc_nat_parsed *, struct bsc_nat *); |
| struct sccp_connections *patch_sccp_src_ref_to_msc(struct msgb *, struct bsc_nat_parsed *, struct bsc_nat *); |
| |
| /** |
| * MGCP/Audio handling |
| */ |
| int bsc_write_mgcp(struct bsc_connection *bsc, const u_int8_t *data, unsigned int length); |
| int bsc_mgcp_assign(struct sccp_connections *, struct msgb *msg); |
| void bsc_mgcp_clear(struct sccp_connections *); |
| void bsc_mgcp_free_endpoint(struct bsc_nat *nat, int); |
| void bsc_mgcp_free_endpoints(struct bsc_nat *nat); |
| int bsc_mgcp_init(struct bsc_nat *nat); |
| |
| struct bsc_connection *bsc_mgcp_find_con(struct bsc_nat *, int endpoint_number); |
| struct msgb *bsc_mgcp_rewrite(char *input, int length, const char *ip, int port); |
| void bsc_mgcp_forward(struct bsc_connection *bsc, struct msgb *msg); |
| |
| void bsc_mgcp_clear_endpoints_for(struct bsc_connection *bsc); |
| int bsc_mgcp_parse_response(const char *str, int *code, char transaction[60]); |
| int bsc_mgcp_extract_ci(const char *resp); |
| |
| |
| int bsc_write(struct bsc_connection *bsc, struct msgb *msg, int id); |
| |
| #endif |