#ifndef __AF_SIMPLE_CONNTRACK_H__
#define __AF_SIMPLE_CONNTRACK_H__

#include <linux/types.h>
#include <linux/list.h>
#define AF_CONN_TIMEOUT 30  
#define AF_CONN_HASH_SIZE 256

extern spinlock_t af_conn_lock;
typedef enum {
    AF_CONN_NEW = 0,
    AF_CONN_ESTABLISHED,
    AF_CONN_DPI_FINISHED,
} af_conn_state_t;

typedef struct {
    struct hlist_node node;     
    u32 src_ip;
    u32 dst_ip;
    u16 src_port;
    u16 dst_port;
    u8  protocol;
    u32 total_pkts;
    u32 app_id;
	u8 client_hello;
    u8  drop;
    u8 ignore;
    af_conn_state_t state;      
    unsigned long last_jiffies;
} af_conn_t;

int af_conn_init(void);

void af_conn_cleanup(void);
af_conn_t* af_conn_add(u32 src_ip, u32 dst_ip, 
                       u16 src_port, u16 dst_port, 
                       u8 protocol);

af_conn_t* af_conn_find(u32 src_ip, u32 dst_ip, 
                       u16 src_port, u16 dst_port, 
                       u8 protocol);

af_conn_t* af_conn_find_and_add(u32 src_ip, u32 dst_ip, 
                       u16 src_port, u16 dst_port, 
                       u8 protocol);

void af_conn_update(af_conn_t *conn, u32 app_id, u8 drop);

void af_conn_clean_timeout(void);


void af_conn_exit(void);
#endif