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