| /* |
| * (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 <osmocore/select.h> |
| #include <osmocore/msgb.h> |
| #include <osmocore/timer.h> |
| #include <osmocore/write_queue.h> |
| #include <osmocore/rate_ctr.h> |
| #include <osmocore/statistics.h> |
| |
| #include <regex.h> |
| |
| #define DIR_BSC 1 |
| #define DIR_MSC 2 |
| |
| #define NAT_IPAC_PROTO_MGCP 0xfc |
| |
| struct sccp_connections; |
| struct bsc_nat_parsed; |
| struct bsc_nat; |
| |
| enum { |
| NAT_CON_TYPE_NONE, |
| NAT_CON_TYPE_LU, |
| NAT_CON_TYPE_CM_SERV_REQ, |
| NAT_CON_TYPE_PAG_RESP, |
| 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 */ |
| int endpoint_status[32]; |
| 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, |
| }; |
| |
| /** |
| * One BSC entry in the config |
| */ |
| struct bsc_config { |
| struct llist_head entry; |
| |
| char *token; |
| unsigned int lac; |
| int nr; |
| |
| char *description; |
| |
| /* imsi white and blacklist */ |
| char *acc_lst_name; |
| |
| int forbid_paging; |
| |
| /* backpointer */ |
| struct bsc_nat *nat; |
| |
| struct bsc_config_stats stats; |
| }; |
| |
| /** |
| * 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 bsc_nat_acc_lst { |
| struct llist_head list; |
| |
| /* 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; |
| |
| /* 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 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); |
| 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 *); |
| |
| /** |
| * MGCP/Audio handling |
| */ |
| 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); |
| |
| /* 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_msc_is_connected(struct bsc_nat *nat); |
| |
| #endif |