/* * (C) 2010 by Holger Hans Peter Freyther * (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 . * */ #ifndef BSC_NAT_H #define BSC_NAT_H #include "mgcp.h" #include #include #include #include #include #include #include #include #include #include #define DIR_BSC 1 #define DIR_MSC 2 struct sccp_source_reference; struct sccp_connections; struct bsc_nat_parsed; struct bsc_nat; struct bsc_nat_ussd_con; enum { NAT_CON_TYPE_NONE, NAT_CON_TYPE_LU, NAT_CON_TYPE_CM_SERV_REQ, NAT_CON_TYPE_PAG_RESP, NAT_CON_TYPE_SSA, NAT_CON_TYPE_LOCAL_REJECT, NAT_CON_TYPE_OTHER, }; /* * 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; /* pong timeout */ struct timer_list ping_timeout; struct timer_list pong_timeout; /* mgcp related code */ char *_endpoint_status; int number_multiplexes; int max_endpoints; int last_endpoint; /* 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; char *token; int nr; char *description; /* imsi white and blacklist */ char *acc_lst_name; int forbid_paging; /* audio handling */ int max_endpoints; /* backpointer */ struct bsc_nat *nat; struct bsc_config_stats stats; struct llist_head lac_list; }; struct bsc_lac_entry { struct llist_head entry; uint16_t lac; }; /** * 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 counter *conn; struct counter *calls; } sccp; struct { struct counter *reconn; struct counter *auth_fail; } bsc; struct { struct counter *reconn; } msc; struct { struct counter *reconn; } ussd; }; enum bsc_nat_acc_ctr { ACC_LIST_BSC_FILTER, ACC_LIST_NAT_FILTER, }; struct bsc_nat_acc_lst { struct llist_head list; /* counter */ struct rate_ctr_group *stats; /* the name of the list */ const char *name; struct llist_head fltr_list; }; struct bsc_nat_acc_lst_entry { struct llist_head list; /* the filter */ char *imsi_allow; regex_t imsi_allow_re; char *imsi_deny; regex_t imsi_deny_re; }; /** * 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; /* 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; /* msc things */ char *msc_ip; int msc_port; struct bsc_msc_connection *msc_con; char *token; /* timeouts */ int auth_timeout; int ping_timeout; int pong_timeout; struct bsc_endpoint *bsc_endpoints; /* filter */ char *acc_lst_name; /* number rewriting */ char *num_rewr_name; struct msg_entries *num_rewr; /* USSD messages we want to match */ char *ussd_lst_name; char *ussd_query; char *ussd_token; char *ussd_local; struct bsc_fd ussd_listen; struct bsc_nat_ussd_con *ussd_con; /* statistics */ struct bsc_nat_statistics stats; }; /* create and init the structures */ struct bsc_config *bsc_config_alloc(struct bsc_nat *nat, const char *token); struct bsc_config *bsc_config_num(struct bsc_nat *nat, int num); 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 sccp_connections *); 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); struct bsc_connection *bsc_nat_find_bsc(struct bsc_nat *nat, struct msgb *msg, int *_lac); /** * Content filtering. */ int bsc_nat_filter_sccp_cr(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *, int *con_type, char **imsi); int bsc_nat_filter_dt(struct bsc_connection *bsc, struct msgb *msg, struct sccp_connections *con, struct bsc_nat_parsed *parsed); /** * SCCP patching and handling */ struct sccp_connections *create_sccp_src_ref(struct bsc_connection *bsc, 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_connection *); struct sccp_connections *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 sccp_connections *, struct msgb *msg); void bsc_mgcp_init(struct sccp_connections *); void bsc_mgcp_dlcx(struct sccp_connections *); void bsc_mgcp_free_endpoints(struct bsc_nat *nat); int bsc_mgcp_nat_init(struct bsc_nat *nat); struct sccp_connections *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); 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 write_queue *queue, struct msgb *msg, int id); int bsc_write_msg(struct write_queue *queue, struct msgb *msg); int bsc_write_cb(struct bsc_fd *bfd, struct msgb *msg); /* IMSI allow/deny handling */ void bsc_parse_reg(void *ctx, regex_t *reg, char **imsi, int argc, const char **argv); struct bsc_nat_acc_lst *bsc_nat_acc_lst_find(struct bsc_nat *nat, const char *name); struct bsc_nat_acc_lst *bsc_nat_acc_lst_get(struct bsc_nat *nat, const char *name); void bsc_nat_acc_lst_delete(struct bsc_nat_acc_lst *lst); struct bsc_nat_acc_lst_entry *bsc_nat_acc_lst_entry_create(struct bsc_nat_acc_lst *); int bsc_nat_lst_check_allow(struct bsc_nat_acc_lst *lst, const char *imsi); int bsc_nat_msc_is_connected(struct bsc_nat *nat); int bsc_conn_type_to_ctr(struct sccp_connections *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_check_ussd(struct sccp_connections *con, struct bsc_nat_parsed *parsed, struct msgb *msg); int bsc_close_ussd_connections(struct bsc_nat *nat); struct msgb *bsc_nat_rewrite_setup(struct bsc_nat *nat, struct msgb *msg, struct bsc_nat_parsed *, const char *imsi); #endif