1#ifndef _UAPI_NF_CONNTRACK_COMMON_H
2#define _UAPI_NF_CONNTRACK_COMMON_H
3/* Connection state tracking for netfilter.  This is separated from,
4   but required by, the NAT layer; it can also be used by an iptables
5   extension. */
6enum ip_conntrack_info {
7	/* Part of an established connection (either direction). */
8	IP_CT_ESTABLISHED,
9
10	/* Like NEW, but related to an existing connection, or ICMP error
11	   (in either direction). */
12	IP_CT_RELATED,
13
14	/* Started a new connection to track (only
15           IP_CT_DIR_ORIGINAL); may be a retransmission. */
16	IP_CT_NEW,
17
18	/* >= this indicates reply direction */
19	IP_CT_IS_REPLY,
20
21	IP_CT_ESTABLISHED_REPLY = IP_CT_ESTABLISHED + IP_CT_IS_REPLY,
22	IP_CT_RELATED_REPLY = IP_CT_RELATED + IP_CT_IS_REPLY,
23	/* No NEW in reply direction. */
24
25	/* Number of distinct IP_CT types. */
26	IP_CT_NUMBER,
27
28	/* only for userspace compatibility */
29#ifndef __KERNEL__
30	IP_CT_NEW_REPLY = IP_CT_NUMBER,
31#endif
32};
33
34#define NF_CT_STATE_INVALID_BIT			(1 << 0)
35#define NF_CT_STATE_BIT(ctinfo)			(1 << ((ctinfo) % IP_CT_IS_REPLY + 1))
36#define NF_CT_STATE_UNTRACKED_BIT		(1 << (IP_CT_NUMBER + 1))
37
38/* Bitset representing status of connection. */
39enum ip_conntrack_status {
40	/* It's an expected connection: bit 0 set.  This bit never changed */
41	IPS_EXPECTED_BIT = 0,
42	IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
43
44	/* We've seen packets both ways: bit 1 set.  Can be set, not unset. */
45	IPS_SEEN_REPLY_BIT = 1,
46	IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
47
48	/* Conntrack should never be early-expired. */
49	IPS_ASSURED_BIT = 2,
50	IPS_ASSURED = (1 << IPS_ASSURED_BIT),
51
52	/* Connection is confirmed: originating packet has left box */
53	IPS_CONFIRMED_BIT = 3,
54	IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
55
56	/* Connection needs src nat in orig dir.  This bit never changed. */
57	IPS_SRC_NAT_BIT = 4,
58	IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
59
60	/* Connection needs dst nat in orig dir.  This bit never changed. */
61	IPS_DST_NAT_BIT = 5,
62	IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
63
64	/* Both together. */
65	IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
66
67	/* Connection needs TCP sequence adjusted. */
68	IPS_SEQ_ADJUST_BIT = 6,
69	IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
70
71	/* NAT initialization bits. */
72	IPS_SRC_NAT_DONE_BIT = 7,
73	IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
74
75	IPS_DST_NAT_DONE_BIT = 8,
76	IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
77
78	/* Both together */
79	IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
80
81	/* Connection is dying (removed from lists), can not be unset. */
82	IPS_DYING_BIT = 9,
83	IPS_DYING = (1 << IPS_DYING_BIT),
84
85	/* Connection has fixed timeout. */
86	IPS_FIXED_TIMEOUT_BIT = 10,
87	IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
88
89	/* Conntrack is a template */
90	IPS_TEMPLATE_BIT = 11,
91	IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT),
92
93	/* Conntrack is a fake untracked entry */
94	IPS_UNTRACKED_BIT = 12,
95	IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT),
96
97	/* Conntrack got a helper explicitly attached via CT target. */
98	IPS_HELPER_BIT = 13,
99	IPS_HELPER = (1 << IPS_HELPER_BIT),
100};
101
102/* Connection tracking event types */
103enum ip_conntrack_events {
104	IPCT_NEW,		/* new conntrack */
105	IPCT_RELATED,		/* related conntrack */
106	IPCT_DESTROY,		/* destroyed conntrack */
107	IPCT_REPLY,		/* connection has seen two-way traffic */
108	IPCT_ASSURED,		/* connection status has changed to assured */
109	IPCT_PROTOINFO,		/* protocol information has changed */
110	IPCT_HELPER,		/* new helper has been set */
111	IPCT_MARK,		/* new mark has been set */
112	IPCT_SEQADJ,		/* sequence adjustment has changed */
113	IPCT_NATSEQADJ = IPCT_SEQADJ,
114	IPCT_SECMARK,		/* new security mark has been set */
115	IPCT_LABEL,		/* new connlabel has been set */
116};
117
118enum ip_conntrack_expect_events {
119	IPEXP_NEW,		/* new expectation */
120	IPEXP_DESTROY,		/* destroyed expectation */
121};
122
123/* expectation flags */
124#define NF_CT_EXPECT_PERMANENT		0x1
125#define NF_CT_EXPECT_INACTIVE		0x2
126#define NF_CT_EXPECT_USERSPACE		0x4
127
128
129#endif /* _UAPI_NF_CONNTRACK_COMMON_H */
130