nf_conntrack_tcp.h

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#ifndef _NF_CONNTRACK_TCP_H
#define _NF_CONNTRACK_TCP_H

#include <uapi/linux/netfilter/nf_conntrack_tcp.h>


struct ip_ct_tcp_state {
    u_int32_t   td_end;     /* max of seq + len */
    u_int32_t   td_maxend;  /* max of ack + max(win, 1) */
    u_int32_t   td_maxwin;  /* max(win) */
    u_int32_t   td_maxack;  /* max of ack */
    u_int8_t    td_scale;   /* window scale factor */
    u_int8_t    flags;      /* per direction options */
};

struct ip_ct_tcp {
    struct ip_ct_tcp_state seen[2]; /* connection parameters per direction */
    u_int8_t    state;      /* state of the connection (enum tcp_conntrack) */
    /* For detecting stale connections */
    u_int8_t    last_dir;   /* Direction of the last packet (enum ip_conntrack_dir) */
    u_int8_t    retrans;    /* Number of retransmitted packets */
    u_int8_t    last_index; /* Index of the last packet */
    u_int32_t   last_seq;   /* Last sequence number seen in dir */
    u_int32_t   last_ack;   /* Last sequence number seen in opposite dir */
    u_int32_t   last_end;   /* Last seq + len */
    u_int16_t   last_win;   /* Last window advertisement seen in dir */
    /* For SYN packets while we may be out-of-sync */
    u_int8_t    last_wscale;    /* Last window scaling factor seen */
    u_int8_t    last_flags; /* Last flags set */
};

#endif /* _NF_CONNTRACK_TCP_H */