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#ifndef _NF_CONNTRACK_TCP_H

#define _NF_CONNTRACK_TCP_H

/* TCP tracking. */

#include <linux/types.h>

/* This is exposed to userspace (ctnetlink) */

enum tcp_conntrack {

        TCP_CONNTRACK_NONE,

        TCP_CONNTRACK_SYN_SENT,

        TCP_CONNTRACK_SYN_RECV,

        TCP_CONNTRACK_ESTABLISHED,

        TCP_CONNTRACK_FIN_WAIT,

        TCP_CONNTRACK_CLOSE_WAIT,

        TCP_CONNTRACK_LAST_ACK,

        TCP_CONNTRACK_TIME_WAIT,

        TCP_CONNTRACK_CLOSE,

        TCP_CONNTRACK_LISTEN,   /* obsolete */

#define TCP_CONNTRACK_SYN_SENT2 TCP_CONNTRACK_LISTEN

        TCP_CONNTRACK_MAX,

        TCP_CONNTRACK_IGNORE,

        TCP_CONNTRACK_RETRANS,

        TCP_CONNTRACK_UNACK,

        TCP_CONNTRACK_TIMEOUT_MAX

};

/* Window scaling is advertised by the sender */

#define IP_CT_TCP_FLAG_WINDOW_SCALE             0x01

/* SACK is permitted by the sender */

#define IP_CT_TCP_FLAG_SACK_PERM                0x02

/* This sender sent FIN first */

#define IP_CT_TCP_FLAG_CLOSE_INIT               0x04

/* Be liberal in window checking */

#define IP_CT_TCP_FLAG_BE_LIBERAL               0x08

/* Has unacknowledged data */

#define IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED      0x10

/* The field td_maxack has been set */

#define IP_CT_TCP_FLAG_MAXACK_SET               0x20

struct nf_ct_tcp_flags {

        __u8 flags;

        __u8 mask;

};

#endif /* _NF_CONNTRACK_TCP_H */