/* * (C) 2010-2012 by Holger Hans Peter Freyther * (C) 2010-2012 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 . * */ #ifndef BSC_NAT_H #define BSC_NAT_H #include "mgcp.h" #include "bsc_msg_filter.h" #include #include #include #include #include #include #include #include #include #include #define DIR_BSC 1 #define DIR_MSC 2 #define PAGIN_GROUP_UNASSIGNED -1 struct sccp_source_reference; struct nat_sccp_connection; struct bsc_nat_parsed; struct bsc_nat; struct bsc_nat_ussd_con; struct nat_rewrite_rule; /* * Is this terminated to the MSC, to the local machine (release * handling for IMSI filtering) or to a USSD provider? */ enum { NAT_CON_END_MSC, NAT_CON_END_LOCAL, NAT_CON_END_USSD, }; /* * Pending command entry */ struct bsc_cmd_list { struct llist_head list_entry; struct osmo_timer_list timeout; /* The NATed ID used on the bsc_con*/ int nat_id; /* The control connection from which the command originated */ struct ctrl_connection *ccon; /* The command from the control connection */ struct ctrl_cmd *cmd; }; /* * Per BSC data structure */ struct bsc_connection { struct llist_head list_entry; /* do we know anything about this BSC? */ int authenticated; uint8_t last_rand[16]; /* the fd we use to communicate */ struct osmo_wqueue write_queue; /* incoming message buffer */ struct msgb *pending_msg; /* the BSS associated */ struct bsc_config *cfg; /* a timeout node */ struct osmo_timer_list id_timeout; /* pong timeout */ struct osmo_timer_list ping_timeout; struct osmo_timer_list pong_timeout; /* mgcp related code */ char *_endpoint_status; int number_multiplexes; int max_endpoints; int last_endpoint; int next_transaction; uint32_t pending_dlcx_count; struct llist_head pending_dlcx; /* track the pending commands for this BSC */ struct llist_head cmd_pending; int last_id; /* a back pointer */ struct bsc_nat *nat; }; /** * Stats per BSC */ struct bsc_config_stats { struct rate_ctr_group *ctrg; }; enum bsc_cfg_ctr { BCFG_CTR_SCCP_CONN, BCFG_CTR_SCCP_CALLS, BCFG_CTR_NET_RECONN, BCFG_CTR_DROPPED_SCCP, BCFG_CTR_DROPPED_CALLS, BCFG_CTR_REJECTED_CR, BCFG_CTR_REJECTED_MSG, BCFG_CTR_ILL_PACKET, BCFG_CTR_CON_TYPE_LU, BCFG_CTR_CON_CMSERV_RQ, BCFG_CTR_CON_PAG_RESP, BCFG_CTR_CON_SSA, BCFG_CTR_CON_OTHER, }; /** * One BSC entry in the config */ struct bsc_config { struct llist_head entry; uint8_t key[16]; uint8_t key_present; char *token; int nr; char *description; /* imsi white and blacklist */ char *acc_lst_name; int forbid_paging; int paging_group; /* audio handling */ int max_endpoints; /* used internally for reload handling */ bool remove; bool token_updated; /* backpointer */ struct bsc_nat *nat; struct bsc_config_stats stats; struct llist_head lac_list; /* Osmux is enabled/disabled per BSC */ int osmux; }; struct bsc_lac_entry { struct llist_head entry; uint16_t lac; }; struct bsc_nat_paging_group { struct llist_head entry; /* list of lac entries */ struct llist_head lists; int nr; }; /** * BSCs point of view of endpoints */ struct bsc_endpoint { /* the operation that is carried out */ int transaction_state; /* the pending transaction id */ char *transaction_id; /* the bsc we are talking to */ struct bsc_connection *bsc; }; /** * Statistic for the nat. */ struct bsc_nat_statistics { struct { struct osmo_counter *conn; struct osmo_counter *calls; } sccp; struct { struct osmo_counter *reconn; struct osmo_counter *auth_fail; } bsc; struct { struct osmo_counter *reconn; } msc; struct { struct osmo_counter *reconn; } ussd; }; /** * 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; /* access lists */ struct llist_head access_lists; /* paging groups */ struct llist_head paging_groups; /* known BSC's */ struct llist_head bsc_configs; int num_bsc; int bsc_ip_dscp; /* MGCP config */ struct mgcp_config *mgcp_cfg; uint8_t mgcp_msg[4096]; int mgcp_length; int mgcp_ipa; int sdp_ensure_amr_mode_set; /* msc things */ struct llist_head dests; struct bsc_msc_dest *main_dest; struct bsc_msc_connection *msc_con; char *token; /* timeouts */ int auth_timeout; int ping_timeout; int pong_timeout; struct bsc_endpoint *bsc_endpoints; /* path to file with BSC config */ char *include_file; char *include_base; char *resolved_path; /* filter */ char *acc_lst_name; /* Barring of subscribers with a rb tree */ struct rb_root imsi_black_list; char *imsi_black_list_fn; /* number rewriting */ char *num_rewr_name; struct llist_head num_rewr; char *num_rewr_post_name; struct llist_head num_rewr_post; char *smsc_rewr_name; struct llist_head smsc_rewr; char *tpdest_match_name; struct llist_head tpdest_match; char *sms_clear_tp_srr_name; struct llist_head sms_clear_tp_srr; char *sms_num_rewr_name; struct llist_head sms_num_rewr; /* more rewriting */ char *num_rewr_trie_name; struct nat_rewrite *num_rewr_trie; /* USSD messages we want to match */ char *ussd_lst_name; char *ussd_query; regex_t ussd_query_re; char *ussd_token; char *ussd_local; struct osmo_fd ussd_listen; struct bsc_nat_ussd_con *ussd_con; /* for maintainenance */ int blocked; /* statistics */ struct bsc_nat_statistics stats; /* control interface */ struct ctrl_handle *ctrl; }; struct bsc_nat_ussd_con { struct osmo_wqueue queue; struct bsc_nat *nat; int authorized; struct msgb *pending_msg; struct osmo_timer_list auth_timeout; }; /* create and init the structures */ struct bsc_config *bsc_config_alloc(struct bsc_nat *nat, const char *token, unsigned int number); struct bsc_config *bsc_config_num(struct bsc_nat *nat, int num); struct bsc_config *bsc_config_by_token(struct bsc_nat *nat, const char *token, int len); void bsc_config_free(struct bsc_config *); void bsc_config_add_lac(struct bsc_config *cfg, int lac); void bsc_config_del_lac(struct bsc_config *cfg, int lac); int bsc_config_handles_lac(struct bsc_config *cfg, int lac); struct bsc_nat *bsc_nat_alloc(void); struct bsc_connection *bsc_connection_alloc(struct bsc_nat *nat); void bsc_nat_set_msc_ip(struct bsc_nat *bsc, const char *ip); void sccp_connection_destroy(struct nat_sccp_connection *); void bsc_close_connection(struct bsc_connection *); const char *bsc_con_type_to_string(int type); /** * 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); int bsc_nat_find_paging(struct msgb *msg, const uint8_t **,int *len); /** * SCCP patching and handling */ struct nat_sccp_connection *create_sccp_src_ref(struct bsc_connection *bsc, struct bsc_nat_parsed *parsed); int update_sccp_src_ref(struct nat_sccp_connection *sccp, struct bsc_nat_parsed *parsed); void remove_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed); struct nat_sccp_connection *patch_sccp_src_ref_to_bsc(struct msgb *, struct bsc_nat_parsed *, struct bsc_nat *); struct nat_sccp_connection *patch_sccp_src_ref_to_msc(struct msgb *, struct bsc_nat_parsed *, struct bsc_connection *); struct nat_sccp_connection *bsc_nat_find_con_by_bsc(struct bsc_nat *, struct sccp_source_reference *); /** * MGCP/Audio handling */ int bsc_mgcp_nr_multiplexes(int max_endpoints); int bsc_write_mgcp(struct bsc_connection *bsc, const uint8_t *data, unsigned int length); int bsc_mgcp_assign_patch(struct nat_sccp_connection *, struct msgb *msg); void bsc_mgcp_init(struct nat_sccp_connection *); void bsc_mgcp_dlcx(struct nat_sccp_connection *); void bsc_mgcp_free_endpoints(struct bsc_nat *nat); int bsc_mgcp_nat_init(struct bsc_nat *nat); struct nat_sccp_connection *bsc_mgcp_find_con(struct bsc_nat *, int endpoint_number); struct msgb *bsc_mgcp_rewrite(char *input, int length, int endp, const char *ip, int port, int osmux, int *first_payload_type, int mode_set); 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]); uint32_t bsc_mgcp_extract_ci(const char *resp); int bsc_write(struct bsc_connection *bsc, struct msgb *msg, int id); int bsc_do_write(struct osmo_wqueue *queue, struct msgb *msg, int id); int bsc_write_msg(struct osmo_wqueue *queue, struct msgb *msg); int bsc_write_cb(struct osmo_fd *bfd, struct msgb *msg); int bsc_nat_msc_is_connected(struct bsc_nat *nat); int bsc_conn_type_to_ctr(struct nat_sccp_connection *conn); struct gsm48_hdr *bsc_unpack_dtap(struct bsc_nat_parsed *parsed, struct msgb *msg, uint32_t *len); /** USSD filtering */ int bsc_ussd_init(struct bsc_nat *nat); int bsc_ussd_check(struct nat_sccp_connection *con, struct bsc_nat_parsed *parsed, struct msgb *msg); int bsc_ussd_close_connections(struct bsc_nat *nat); struct msgb *bsc_nat_rewrite_msg(struct bsc_nat *nat, struct msgb *msg, struct bsc_nat_parsed *, const char *imsi); /** paging group handling */ struct bsc_nat_paging_group *bsc_nat_paging_group_num(struct bsc_nat *nat, int group); struct bsc_nat_paging_group *bsc_nat_paging_group_create(struct bsc_nat *nat, int group); void bsc_nat_paging_group_delete(struct bsc_nat_paging_group *); void bsc_nat_paging_group_add_lac(struct bsc_nat_paging_group *grp, int lac); void bsc_nat_paging_group_del_lac(struct bsc_nat_paging_group *grp, int lac); /** * Number rewriting support below */ struct bsc_nat_num_rewr_entry { struct llist_head list; regex_t msisdn_reg; regex_t num_reg; char *replace; uint8_t is_prefix_lookup; }; void bsc_nat_num_rewr_entry_adapt(void *ctx, struct llist_head *head, const struct osmo_config_list *); void bsc_nat_send_mgcp_to_msc(struct bsc_nat *bsc_nat, struct msgb *msg); void bsc_nat_handle_mgcp(struct bsc_nat *bsc, struct msgb *msg); struct ctrl_handle *bsc_nat_controlif_setup(struct bsc_nat *nat, const char *bind_addr, int port); void bsc_nat_ctrl_del_pending(struct bsc_cmd_list *pending); int bsc_nat_handle_ctrlif_msg(struct bsc_connection *bsc, struct msgb *msg); int bsc_nat_extract_lac(struct bsc_connection *bsc, struct nat_sccp_connection *con, struct bsc_nat_parsed *parsed, struct msgb *msg); int bsc_nat_filter_sccp_cr(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *, int *con_type, char **imsi, struct bsc_filter_reject_cause *cause); int bsc_nat_filter_dt(struct bsc_connection *bsc, struct msgb *msg, struct nat_sccp_connection *con, struct bsc_nat_parsed *parsed, struct bsc_filter_reject_cause *cause); /** * CTRL interface helper */ void bsc_nat_inform_reject(struct bsc_connection *bsc, const char *imsi); /* * Use for testing */ void bsc_nat_free(struct bsc_nat *nat); #endif