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#ifndef _IP_CONNTRACK_TCP_H
#define _IP_CONNTRACK_TCP_H
/* TCP tracking. */
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,
TCP_CONNTRACK_MAX,
TCP_CONNTRACK_IGNORE
};
/* 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 0x03
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_int8_t td_scale; /* window scale factor */
u_int8_t loose; /* used when connection picked up from the middle */
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 */
};
#endif /* _IP_CONNTRACK_TCP_H */
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