1 #ifndef _NF_CONNTRACK_TCP_H
2 #define _NF_CONNTRACK_TCP_H
5 /* This is exposed to userspace (ctnetlink) */
8 TCP_CONNTRACK_SYN_SENT,
9 TCP_CONNTRACK_SYN_RECV,
10 TCP_CONNTRACK_ESTABLISHED,
11 TCP_CONNTRACK_FIN_WAIT,
12 TCP_CONNTRACK_CLOSE_WAIT,
13 TCP_CONNTRACK_LAST_ACK,
14 TCP_CONNTRACK_TIME_WAIT,
21 /* Window scaling is advertised by the sender */
22 #define IP_CT_TCP_FLAG_WINDOW_SCALE 0x01
24 /* SACK is permitted by the sender */
25 #define IP_CT_TCP_FLAG_SACK_PERM 0x02
27 /* This sender sent FIN first */
28 #define IP_CT_TCP_FLAG_CLOSE_INIT 0x04
30 /* Be liberal in window checking */
31 #define IP_CT_TCP_FLAG_BE_LIBERAL 0x08
35 struct ip_ct_tcp_state {
36 u_int32_t td_end; /* max of seq + len */
37 u_int32_t td_maxend; /* max of ack + max(win, 1) */
38 u_int32_t td_maxwin; /* max(win) */
39 u_int8_t td_scale; /* window scale factor */
40 u_int8_t flags; /* per direction options */
45 struct ip_ct_tcp_state seen[2]; /* connection parameters per direction */
46 u_int8_t state; /* state of the connection (enum tcp_conntrack) */
47 /* For detecting stale connections */
48 u_int8_t last_dir; /* Direction of the last packet (enum ip_conntrack_dir) */
49 u_int8_t retrans; /* Number of retransmitted packets */
50 u_int8_t last_index; /* Index of the last packet */
51 u_int32_t last_seq; /* Last sequence number seen in dir */
52 u_int32_t last_ack; /* Last sequence number seen in opposite dir */
53 u_int32_t last_end; /* Last seq + len */
54 u_int16_t last_win; /* Last window advertisement seen in dir */
57 #endif /* __KERNEL__ */
59 #endif /* _NF_CONNTRACK_TCP_H */