1 #ifndef _NF_CONNTRACK_TCP_H
2 #define _NF_CONNTRACK_TCP_H
5 #include <linux/types.h>
7 /* This is exposed to userspace (ctnetlink) */
10 TCP_CONNTRACK_SYN_SENT
,
11 TCP_CONNTRACK_SYN_RECV
,
12 TCP_CONNTRACK_ESTABLISHED
,
13 TCP_CONNTRACK_FIN_WAIT
,
14 TCP_CONNTRACK_CLOSE_WAIT
,
15 TCP_CONNTRACK_LAST_ACK
,
16 TCP_CONNTRACK_TIME_WAIT
,
18 TCP_CONNTRACK_LISTEN
, /* obsolete */
19 #define TCP_CONNTRACK_SYN_SENT2 TCP_CONNTRACK_LISTEN
24 /* Window scaling is advertised by the sender */
25 #define IP_CT_TCP_FLAG_WINDOW_SCALE 0x01
27 /* SACK is permitted by the sender */
28 #define IP_CT_TCP_FLAG_SACK_PERM 0x02
30 /* This sender sent FIN first */
31 #define IP_CT_TCP_FLAG_CLOSE_INIT 0x04
33 /* Be liberal in window checking */
34 #define IP_CT_TCP_FLAG_BE_LIBERAL 0x08
36 /* Has unacknowledged data */
37 #define IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED 0x10
39 /* The field td_maxack has been set */
40 #define IP_CT_TCP_FLAG_MAXACK_SET 0x20
42 struct nf_ct_tcp_flags
{
49 struct ip_ct_tcp_state
{
50 u_int32_t td_end
; /* max of seq + len */
51 u_int32_t td_maxend
; /* max of ack + max(win, 1) */
52 u_int32_t td_maxwin
; /* max(win) */
53 u_int32_t td_maxack
; /* max of ack */
54 u_int8_t td_scale
; /* window scale factor */
55 u_int8_t flags
; /* per direction options */
60 struct ip_ct_tcp_state seen
[2]; /* connection parameters per direction */
61 u_int8_t state
; /* state of the connection (enum tcp_conntrack) */
62 /* For detecting stale connections */
63 u_int8_t last_dir
; /* Direction of the last packet (enum ip_conntrack_dir) */
64 u_int8_t retrans
; /* Number of retransmitted packets */
65 u_int8_t last_index
; /* Index of the last packet */
66 u_int32_t last_seq
; /* Last sequence number seen in dir */
67 u_int32_t last_ack
; /* Last sequence number seen in opposite dir */
68 u_int32_t last_end
; /* Last seq + len */
69 u_int16_t last_win
; /* Last window advertisement seen in dir */
72 #endif /* __KERNEL__ */
74 #endif /* _NF_CONNTRACK_TCP_H */