nf_conntrack_tcp.h

 1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 2#ifndef _UAPI_NF_CONNTRACK_TCP_H
 3#define _UAPI_NF_CONNTRACK_TCP_H
 4/* TCP tracking. */
 5
 6#include <linux/types.h>
 7
 8/* This is exposed to userspace (ctnetlink) */
 9enum tcp_conntrack {
10	TCP_CONNTRACK_NONE,
11	TCP_CONNTRACK_SYN_SENT,
12	TCP_CONNTRACK_SYN_RECV,
13	TCP_CONNTRACK_ESTABLISHED,
14	TCP_CONNTRACK_FIN_WAIT,
15	TCP_CONNTRACK_CLOSE_WAIT,
16	TCP_CONNTRACK_LAST_ACK,
17	TCP_CONNTRACK_TIME_WAIT,
18	TCP_CONNTRACK_CLOSE,
19	TCP_CONNTRACK_LISTEN,	/* obsolete */
20#define TCP_CONNTRACK_SYN_SENT2	TCP_CONNTRACK_LISTEN
21	TCP_CONNTRACK_MAX,
22	TCP_CONNTRACK_IGNORE,
23	TCP_CONNTRACK_RETRANS,
24	TCP_CONNTRACK_UNACK,
25	TCP_CONNTRACK_TIMEOUT_MAX
26};
27
28/* Window scaling is advertised by the sender */
29#define IP_CT_TCP_FLAG_WINDOW_SCALE		0x01
30
31/* SACK is permitted by the sender */
32#define IP_CT_TCP_FLAG_SACK_PERM		0x02
33
34/* This sender sent FIN first */
35#define IP_CT_TCP_FLAG_CLOSE_INIT		0x04
36
37/* Be liberal in window checking */
38#define IP_CT_TCP_FLAG_BE_LIBERAL		0x08
39
40/* Has unacknowledged data */
41#define IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED	0x10
42
43/* The field td_maxack has been set */
44#define IP_CT_TCP_FLAG_MAXACK_SET		0x20
45
46/* Marks possibility for expected RFC5961 challenge ACK */
47#define IP_CT_EXP_CHALLENGE_ACK 		0x40
48
49/* Simultaneous open initialized */
50#define IP_CT_TCP_SIMULTANEOUS_OPEN		0x80
51
52struct nf_ct_tcp_flags {
53	__u8 flags;
54	__u8 mask;
55};
56
57
58#endif /* _UAPI_NF_CONNTRACK_TCP_H */