374 lines
9.3 KiB
C
374 lines
9.3 KiB
C
/*
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* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2010 by On-Waves
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef BSC_NAT_H
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#define BSC_NAT_H
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#include "mgcp.h"
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#include <osmocom/core/select.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/msgfile.h>
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#include <osmocom/core/timer.h>
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#include <osmocom/core/write_queue.h>
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#include <osmocom/core/rate_ctr.h>
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#include <osmocom/core/statistics.h>
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#include <osmocom/gsm/protocol/gsm_04_08.h>
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#include <regex.h>
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#define DIR_BSC 1
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#define DIR_MSC 2
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struct sccp_source_reference;
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struct sccp_connections;
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struct bsc_nat_parsed;
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struct bsc_nat;
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struct bsc_nat_ussd_con;
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enum {
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NAT_CON_TYPE_NONE,
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NAT_CON_TYPE_LU,
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NAT_CON_TYPE_CM_SERV_REQ,
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NAT_CON_TYPE_PAG_RESP,
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NAT_CON_TYPE_SSA,
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NAT_CON_TYPE_LOCAL_REJECT,
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NAT_CON_TYPE_OTHER,
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};
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/*
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* Is this terminated to the MSC, to the local machine (release
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* handling for IMSI filtering) or to a USSD provider?
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*/
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enum {
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NAT_CON_END_MSC,
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NAT_CON_END_LOCAL,
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NAT_CON_END_USSD,
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};
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/*
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* Per BSC data structure
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*/
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struct bsc_connection {
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struct llist_head list_entry;
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/* do we know anything about this BSC? */
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int authenticated;
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/* the fd we use to communicate */
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struct write_queue write_queue;
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/* the BSS associated */
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struct bsc_config *cfg;
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/* a timeout node */
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struct timer_list id_timeout;
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/* pong timeout */
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struct timer_list ping_timeout;
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struct timer_list pong_timeout;
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/* mgcp related code */
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char *_endpoint_status;
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int number_multiplexes;
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int max_endpoints;
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int last_endpoint;
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/* a back pointer */
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struct bsc_nat *nat;
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};
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/**
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* Stats per BSC
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*/
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struct bsc_config_stats {
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struct rate_ctr_group *ctrg;
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};
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enum bsc_cfg_ctr {
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BCFG_CTR_SCCP_CONN,
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BCFG_CTR_SCCP_CALLS,
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BCFG_CTR_NET_RECONN,
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BCFG_CTR_DROPPED_SCCP,
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BCFG_CTR_DROPPED_CALLS,
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BCFG_CTR_REJECTED_CR,
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BCFG_CTR_REJECTED_MSG,
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BCFG_CTR_ILL_PACKET,
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BCFG_CTR_CON_TYPE_LU,
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BCFG_CTR_CON_CMSERV_RQ,
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BCFG_CTR_CON_PAG_RESP,
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BCFG_CTR_CON_SSA,
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BCFG_CTR_CON_OTHER,
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};
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/**
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* One BSC entry in the config
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*/
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struct bsc_config {
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struct llist_head entry;
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char *token;
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int nr;
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char *description;
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/* imsi white and blacklist */
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char *acc_lst_name;
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int forbid_paging;
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/* audio handling */
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int max_endpoints;
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/* backpointer */
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struct bsc_nat *nat;
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struct bsc_config_stats stats;
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struct llist_head lac_list;
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};
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struct bsc_lac_entry {
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struct llist_head entry;
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uint16_t lac;
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};
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/**
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* BSCs point of view of endpoints
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*/
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struct bsc_endpoint {
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/* the operation that is carried out */
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int transaction_state;
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/* the pending transaction id */
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char *transaction_id;
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/* the bsc we are talking to */
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struct bsc_connection *bsc;
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};
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/**
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* Statistic for the nat.
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*/
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struct bsc_nat_statistics {
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struct {
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struct counter *conn;
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struct counter *calls;
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} sccp;
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struct {
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struct counter *reconn;
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struct counter *auth_fail;
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} bsc;
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struct {
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struct counter *reconn;
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} msc;
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struct {
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struct counter *reconn;
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} ussd;
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};
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enum bsc_nat_acc_ctr {
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ACC_LIST_BSC_FILTER,
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ACC_LIST_NAT_FILTER,
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};
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struct bsc_nat_acc_lst {
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struct llist_head list;
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/* counter */
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struct rate_ctr_group *stats;
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/* the name of the list */
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const char *name;
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struct llist_head fltr_list;
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};
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struct bsc_nat_acc_lst_entry {
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struct llist_head list;
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/* the filter */
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char *imsi_allow;
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regex_t imsi_allow_re;
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char *imsi_deny;
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regex_t imsi_deny_re;
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};
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/**
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* the structure of the "nat" network
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*/
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struct bsc_nat {
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/* active SCCP connections that need patching */
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struct llist_head sccp_connections;
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/* active BSC connections that need patching */
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struct llist_head bsc_connections;
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/* access lists */
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struct llist_head access_lists;
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/* known BSC's */
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struct llist_head bsc_configs;
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int num_bsc;
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int bsc_ip_dscp;
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/* MGCP config */
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struct mgcp_config *mgcp_cfg;
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uint8_t mgcp_msg[4096];
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int mgcp_length;
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/* msc things */
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char *msc_ip;
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int msc_port;
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struct bsc_msc_connection *msc_con;
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char *token;
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/* timeouts */
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int auth_timeout;
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int ping_timeout;
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int pong_timeout;
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struct bsc_endpoint *bsc_endpoints;
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/* filter */
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char *acc_lst_name;
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/* number rewriting */
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char *num_rewr_name;
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struct msg_entries *num_rewr;
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/* USSD messages we want to match */
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char *ussd_lst_name;
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char *ussd_query;
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regex_t ussd_query_re;
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char *ussd_token;
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char *ussd_local;
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struct bsc_fd ussd_listen;
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struct bsc_nat_ussd_con *ussd_con;
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/* statistics */
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struct bsc_nat_statistics stats;
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};
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struct bsc_nat_ussd_con {
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struct write_queue queue;
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struct bsc_nat *nat;
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int authorized;
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struct timer_list auth_timeout;
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};
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/* create and init the structures */
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struct bsc_config *bsc_config_alloc(struct bsc_nat *nat, const char *token);
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struct bsc_config *bsc_config_num(struct bsc_nat *nat, int num);
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void bsc_config_free(struct bsc_config *);
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void bsc_config_add_lac(struct bsc_config *cfg, int lac);
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void bsc_config_del_lac(struct bsc_config *cfg, int lac);
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int bsc_config_handles_lac(struct bsc_config *cfg, int lac);
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struct bsc_nat *bsc_nat_alloc(void);
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struct bsc_connection *bsc_connection_alloc(struct bsc_nat *nat);
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void bsc_nat_set_msc_ip(struct bsc_nat *bsc, const char *ip);
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void sccp_connection_destroy(struct sccp_connections *);
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void bsc_close_connection(struct bsc_connection *);
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const char *bsc_con_type_to_string(int type);
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/**
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* parse the given message into the above structure
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*/
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struct bsc_nat_parsed *bsc_nat_parse(struct msgb *msg);
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/**
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* filter based on IP Access header in both directions
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*/
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int bsc_nat_filter_ipa(int direction, struct msgb *msg, struct bsc_nat_parsed *parsed);
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int bsc_nat_vty_init(struct bsc_nat *nat);
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struct bsc_connection *bsc_nat_find_bsc(struct bsc_nat *nat, struct msgb *msg, int *_lac);
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/**
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* Content filtering.
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*/
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int bsc_nat_filter_sccp_cr(struct bsc_connection *bsc, struct msgb *msg,
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struct bsc_nat_parsed *, int *con_type, char **imsi);
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int bsc_nat_filter_dt(struct bsc_connection *bsc, struct msgb *msg,
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struct sccp_connections *con, struct bsc_nat_parsed *parsed);
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/**
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* SCCP patching and handling
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*/
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struct sccp_connections *create_sccp_src_ref(struct bsc_connection *bsc, struct bsc_nat_parsed *parsed);
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int update_sccp_src_ref(struct sccp_connections *sccp, struct bsc_nat_parsed *parsed);
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void remove_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed);
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struct sccp_connections *patch_sccp_src_ref_to_bsc(struct msgb *, struct bsc_nat_parsed *, struct bsc_nat *);
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struct sccp_connections *patch_sccp_src_ref_to_msc(struct msgb *, struct bsc_nat_parsed *, struct bsc_connection *);
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struct sccp_connections *bsc_nat_find_con_by_bsc(struct bsc_nat *, struct sccp_source_reference *);
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/**
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* MGCP/Audio handling
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*/
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int bsc_mgcp_nr_multiplexes(int max_endpoints);
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int bsc_write_mgcp(struct bsc_connection *bsc, const uint8_t *data, unsigned int length);
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int bsc_mgcp_assign_patch(struct sccp_connections *, struct msgb *msg);
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void bsc_mgcp_init(struct sccp_connections *);
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void bsc_mgcp_dlcx(struct sccp_connections *);
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void bsc_mgcp_free_endpoints(struct bsc_nat *nat);
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int bsc_mgcp_nat_init(struct bsc_nat *nat);
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struct sccp_connections *bsc_mgcp_find_con(struct bsc_nat *, int endpoint_number);
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struct msgb *bsc_mgcp_rewrite(char *input, int length, int endp, const char *ip, int port);
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void bsc_mgcp_forward(struct bsc_connection *bsc, struct msgb *msg);
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void bsc_mgcp_clear_endpoints_for(struct bsc_connection *bsc);
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int bsc_mgcp_parse_response(const char *str, int *code, char transaction[60]);
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uint32_t bsc_mgcp_extract_ci(const char *resp);
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int bsc_write(struct bsc_connection *bsc, struct msgb *msg, int id);
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int bsc_do_write(struct write_queue *queue, struct msgb *msg, int id);
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int bsc_write_msg(struct write_queue *queue, struct msgb *msg);
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int bsc_write_cb(struct bsc_fd *bfd, struct msgb *msg);
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/* IMSI allow/deny handling */
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int bsc_parse_reg(void *ctx, regex_t *reg, char **imsi, int argc, const char **argv) __attribute__ ((warn_unused_result));
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struct bsc_nat_acc_lst *bsc_nat_acc_lst_find(struct bsc_nat *nat, const char *name);
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struct bsc_nat_acc_lst *bsc_nat_acc_lst_get(struct bsc_nat *nat, const char *name);
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void bsc_nat_acc_lst_delete(struct bsc_nat_acc_lst *lst);
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struct bsc_nat_acc_lst_entry *bsc_nat_acc_lst_entry_create(struct bsc_nat_acc_lst *);
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int bsc_nat_lst_check_allow(struct bsc_nat_acc_lst *lst, const char *imsi);
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int bsc_nat_msc_is_connected(struct bsc_nat *nat);
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int bsc_conn_type_to_ctr(struct sccp_connections *conn);
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struct gsm48_hdr *bsc_unpack_dtap(struct bsc_nat_parsed *parsed, struct msgb *msg, uint32_t *len);
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/** USSD filtering */
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int bsc_ussd_init(struct bsc_nat *nat);
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int bsc_check_ussd(struct sccp_connections *con, struct bsc_nat_parsed *parsed, struct msgb *msg);
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int bsc_close_ussd_connections(struct bsc_nat *nat);
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struct msgb *bsc_nat_rewrite_setup(struct bsc_nat *nat, struct msgb *msg, struct bsc_nat_parsed *, const char *imsi);
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#endif
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