nf_conntrack_tcp.h

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#ifndef _UAPI_NF_CONNTRACK_TCP_H
#define _UAPI_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 /* _UAPI_NF_CONNTRACK_TCP_H */