/* Everything related to the BSC connection */
/*
 * (C) 2010-2011 by Holger Hans Peter Freyther <zecke@selfish.org>
 * (C) 2010-2011 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 <http://www.gnu.org/licenses/>.
 *
 */

#ifndef BSC_DATA_H
#define BSC_DATA_H

#include "mtp_data.h"

#include <osmocore/linuxlist.h>
#include <osmocore/select.h>
#include <osmocore/timer.h>
#include <osmocore/write_queue.h>

#include <osmocore/protocol/gsm_04_08.h>

#include <osmocom/sccp/sccp.h>


#include <netinet/in.h>
#include <arpa/inet.h>

struct bsc_data;
struct snmp_mtp_session;

/**
 * Struct holding the BSC to MSC forwarding state.
 */
struct bsc_msc_forward {
	/* back pointer */
	struct bsc_data *bsc_data;

	/* the linkset we are using here */
	struct mtp_link_set *bsc;

	/* MSC */
	char *msc_address;
	struct write_queue msc_connection;
	struct timer_list reconnect_timer;
	int first_contact;
	int msc_time;
	struct timer_list msc_timeout;
	int msc_ip_dscp;

	int msc_link_down;
	struct llist_head sccp_connections;
	int reset_count;

	/* LAC of the cell */
	struct gsm48_loc_area_id lai;
	uint16_t mcc;
	uint16_t mnc;
	uint16_t lac;

	const char *token;

	/* timeouts for the msc connection */
	int ping_time;
	int pong_time;
	struct timer_list ping_timeout;
	struct timer_list pong_timeout;
	struct timer_list reset_timeout;

	/* mgcp messgaes */
	struct write_queue mgcp_agent;

	/* do nothing with the data coming from the MSC */
	int forward_only;
};

struct mtp_udp_data {
	struct write_queue write_queue;
	struct timer_list snmp_poll;

	struct llist_head links;
};

struct mtp_udp_link {
	/* subclass */
	struct mtp_link base;

	/* UDP specific stuff */
	struct bsc_data *bsc;
	int link_index;
	int reset_timeout;

	struct sockaddr_in remote;

	struct mtp_udp_data *data;
	struct llist_head entry;

	/* snmp for controlling the link */
	struct snmp_mtp_session *session;
};

enum {
	APP_CELLMGR,
	APP_RELAY,
	APP_STP,
};

struct bsc_data {
	int app;

	struct timer_list start_timer;
	int setup;
	int pcap_fd;
	int udp_reset_timeout;
	struct llist_head links;

	/* udp code */
	struct mtp_udp_data udp_data;

	int dpc;
	int opc;
	int sccp_opc;
	int isup_opc;
	int src_port;
	int udp_port;
	char *udp_ip;
	int udp_nr_links;
	int once;

	/* the network header to use */
	int ni_ni;
	int ni_spare;

	/* isup handling */
	int isup_pass;


	/* inject */
	int allow_inject;
	struct bsc_fd inject_fd;
	struct llist_head inject_list;

	/* MSC related data... currently only one is supported */
	struct bsc_msc_forward msc_forward;
};

/* bsc related functions */
void release_bsc_resources(struct bsc_msc_forward *fw);

void mtp_linkset_down(struct mtp_link_set *);
void mtp_linkset_up(struct mtp_link_set *);

/* msc related functions */
int msc_init(struct bsc_msc_forward *bsc, int mgcp);
void msc_send_rlc(struct bsc_msc_forward *bsc, struct sccp_source_reference *src, struct sccp_source_reference *dest);
void msc_send_reset(struct bsc_msc_forward *bsc);
void msc_send_msg(struct bsc_msc_forward *bsc, int rc, struct sccp_parse_result *, struct msgb *msg);
void msc_send_direct(struct bsc_msc_forward *bsc, struct msgb *msg);
void msc_close_connection(struct bsc_msc_forward *data);

/* connection tracking and action */
void update_con_state(struct bsc_msc_forward *fw, int rc, struct sccp_parse_result *result, struct msgb *msg, int from_msc, int sls);

/* udp init */
int link_global_init(struct mtp_udp_data *data, int src_port);
int link_udp_init(struct mtp_udp_link *data, char *dest_ip, int port);
struct mtp_link_set *link_init(struct bsc_data *bsc);
int link_shutdown_all(struct mtp_link_set *);
int link_reset_all(struct mtp_link_set *);
int link_clear_all(struct mtp_link_set *);

/* MGCP */
void mgcp_forward(struct bsc_msc_forward *bsc, const uint8_t *data, unsigned int length);

/* pcap */
enum {
	NET_IN,
	NET_OUT,
};
int mtp_handle_pcap(struct mtp_link *, int dir, const uint8_t *data, int length);

#endif