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#ifndef _IP_CONNTRACK_FTP_H
#define _IP_CONNTRACK_FTP_H
/* FTP tracking. */

#ifdef __KERNEL__

#include <linux/netfilter_ipv4/lockhelp.h>

/* Protects ftp part of conntracks */
DECLARE_LOCK_EXTERN(ip_ftp_lock);

#define FTP_PORT        21

#endif /* __KERNEL__ */

enum ip_ct_ftp_type
{
        /* PORT command from client */
        IP_CT_FTP_PORT,
        /* PASV response from server */
        IP_CT_FTP_PASV,
        /* EPRT command from client */
        IP_CT_FTP_EPRT,
        /* EPSV response from server */
        IP_CT_FTP_EPSV,
};

/* This structure is per expected connection */
struct ip_ct_ftp_expect
{
        /* We record seq number and length of ftp ip/port text here: all in
         * host order. */

        /* sequence number of IP address in packet is in ip_conntrack_expect */
        u_int32_t len;                  /* length of IP address */
        enum ip_ct_ftp_type ftptype;    /* PORT or PASV ? */
        u_int16_t port;                 /* TCP port that was to be used */
};

/* This structure exists only once per master */
struct ip_ct_ftp_master {
        /* Next valid seq position for cmd matching after newline */
        u_int32_t seq_aft_nl[IP_CT_DIR_MAX];
        /* 0 means seq_match_aft_nl not set */
        int seq_aft_nl_set[IP_CT_DIR_MAX];
};

#endif /* _IP_CONNTRACK_FTP_H */