root/include/linux/netfilter/nf_conntrack_tcp.h

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INCLUDED FROM

#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 */
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