1#ifndef _UAPI_NF_CONNTRACK_TCP_H
2#define _UAPI_NF_CONNTRACK_TCP_H
3/* TCP tracking. */
4
5#include <linux/types.h>
6
7/* This is exposed to userspace (ctnetlink) */
8enum tcp_conntrack {
9	TCP_CONNTRACK_NONE,
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,
17	TCP_CONNTRACK_CLOSE,
18	TCP_CONNTRACK_LISTEN,	/* obsolete */
19#define TCP_CONNTRACK_SYN_SENT2	TCP_CONNTRACK_LISTEN
20	TCP_CONNTRACK_MAX,
21	TCP_CONNTRACK_IGNORE,
22	TCP_CONNTRACK_RETRANS,
23	TCP_CONNTRACK_UNACK,
24	TCP_CONNTRACK_TIMEOUT_MAX
25};
26
27/* Window scaling is advertised by the sender */
28#define IP_CT_TCP_FLAG_WINDOW_SCALE		0x01
29
30/* SACK is permitted by the sender */
31#define IP_CT_TCP_FLAG_SACK_PERM		0x02
32
33/* This sender sent FIN first */
34#define IP_CT_TCP_FLAG_CLOSE_INIT		0x04
35
36/* Be liberal in window checking */
37#define IP_CT_TCP_FLAG_BE_LIBERAL		0x08
38
39/* Has unacknowledged data */
40#define IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED	0x10
41
42/* The field td_maxack has been set */
43#define IP_CT_TCP_FLAG_MAXACK_SET		0x20
44
45/* Marks possibility for expected RFC5961 challenge ACK */
46#define IP_CT_EXP_CHALLENGE_ACK 		0x40
47
48struct nf_ct_tcp_flags {
49	__u8 flags;
50	__u8 mask;
51};
52
53
54#endif /* _UAPI_NF_CONNTRACK_TCP_H */
55