1#ifndef _NF_CONNTRACK_COMMON_H
2#define _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/* Bitset representing status of connection. */
29enum ip_conntrack_status {
30	/* It's an expected connection: bit 0 set.  This bit never changed */
31	IPS_EXPECTED_BIT = 0,
32	IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
33
34	/* We've seen packets both ways: bit 1 set.  Can be set, not unset. */
35	IPS_SEEN_REPLY_BIT = 1,
36	IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
37
38	/* Conntrack should never be early-expired. */
39	IPS_ASSURED_BIT = 2,
40	IPS_ASSURED = (1 << IPS_ASSURED_BIT),
41
42	/* Connection is confirmed: originating packet has left box */
43	IPS_CONFIRMED_BIT = 3,
44	IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
45
46	/* Connection needs src nat in orig dir.  This bit never changed. */
47	IPS_SRC_NAT_BIT = 4,
48	IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
49
50	/* Connection needs dst nat in orig dir.  This bit never changed. */
51	IPS_DST_NAT_BIT = 5,
52	IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
53
54	/* Both together. */
55	IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
56
57	/* Connection needs TCP sequence adjusted. */
58	IPS_SEQ_ADJUST_BIT = 6,
59	IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
60
61	/* NAT initialization bits. */
62	IPS_SRC_NAT_DONE_BIT = 7,
63	IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
64
65	IPS_DST_NAT_DONE_BIT = 8,
66	IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
67
68	/* Both together */
69	IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
70
71	/* Connection is dying (removed from lists), can not be unset. */
72	IPS_DYING_BIT = 9,
73	IPS_DYING = (1 << IPS_DYING_BIT),
74
75	/* Connection has fixed timeout. */
76	IPS_FIXED_TIMEOUT_BIT = 10,
77	IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
78
79	/* Conntrack is a template */
80	IPS_TEMPLATE_BIT = 11,
81	IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT),
82
83	/* Conntrack is a fake untracked entry */
84	IPS_UNTRACKED_BIT = 12,
85	IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT),
86};
87
88/* Connection tracking event types */
89enum ip_conntrack_events {
90	IPCT_NEW,		/* new conntrack */
91	IPCT_RELATED,		/* related conntrack */
92	IPCT_DESTROY,		/* destroyed conntrack */
93	IPCT_REPLY,		/* connection has seen two-way traffic */
94	IPCT_ASSURED,		/* connection status has changed to assured */
95	IPCT_PROTOINFO,		/* protocol information has changed */
96	IPCT_HELPER,		/* new helper has been set */
97	IPCT_MARK,		/* new mark has been set */
98	IPCT_NATSEQADJ,		/* NAT is doing sequence adjustment */
99	IPCT_SECMARK,		/* new security mark has been set */
100};
101
102enum ip_conntrack_expect_events {
103	IPEXP_NEW,		/* new expectation */
104	IPEXP_DESTROY,		/* destroyed expectation */
105};
106
107/* expectation flags */
108#define NF_CT_EXPECT_PERMANENT		0x1
109#define NF_CT_EXPECT_INACTIVE		0x2
110#define NF_CT_EXPECT_USERSPACE		0x4
111
112
113#endif /* _NF_CONNTRACK_COMMON_H */
114