nf_conntrack_common.h revision e37d45ce390c2f5a7f1e64742b9100ecef0def54 
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	/* Number of distinct IP_CT types (no NEW in reply dirn). */
22	IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1
23};
24
25/* Bitset representing status of connection. */
26enum ip_conntrack_status {
27	/* It's an expected connection: bit 0 set.  This bit never changed */
28	IPS_EXPECTED_BIT = 0,
29	IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
30
31	/* We've seen packets both ways: bit 1 set.  Can be set, not unset. */
32	IPS_SEEN_REPLY_BIT = 1,
33	IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
34
35	/* Conntrack should never be early-expired. */
36	IPS_ASSURED_BIT = 2,
37	IPS_ASSURED = (1 << IPS_ASSURED_BIT),
38
39	/* Connection is confirmed: originating packet has left box */
40	IPS_CONFIRMED_BIT = 3,
41	IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
42
43	/* Connection needs src nat in orig dir.  This bit never changed. */
44	IPS_SRC_NAT_BIT = 4,
45	IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
46
47	/* Connection needs dst nat in orig dir.  This bit never changed. */
48	IPS_DST_NAT_BIT = 5,
49	IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
50
51	/* Both together. */
52	IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
53
54	/* Connection needs TCP sequence adjusted. */
55	IPS_SEQ_ADJUST_BIT = 6,
56	IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
57
58	/* NAT initialization bits. */
59	IPS_SRC_NAT_DONE_BIT = 7,
60	IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
61
62	IPS_DST_NAT_DONE_BIT = 8,
63	IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
64
65	/* Both together */
66	IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
67
68	/* Connection is dying (removed from lists), can not be unset. */
69	IPS_DYING_BIT = 9,
70	IPS_DYING = (1 << IPS_DYING_BIT),
71
72	/* Connection has fixed timeout. */
73	IPS_FIXED_TIMEOUT_BIT = 10,
74	IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
75
76	/* Conntrack is a template */
77	IPS_TEMPLATE_BIT = 11,
78	IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT),
79};
80
81/* Connection tracking event types */
82enum ip_conntrack_events {
83	IPCT_NEW,		/* new conntrack */
84	IPCT_RELATED,		/* related conntrack */
85	IPCT_DESTROY,		/* destroyed conntrack */
86	IPCT_REPLY,		/* connection has seen two-way traffic */
87	IPCT_ASSURED,		/* connection status has changed to assured */
88	IPCT_PROTOINFO,		/* protocol information has changed */
89	IPCT_HELPER,		/* new helper has been set */
90	IPCT_MARK,		/* new mark has been set */
91	IPCT_NATSEQADJ,		/* NAT is doing sequence adjustment */
92	IPCT_SECMARK,		/* new security mark has been set */
93};
94
95enum ip_conntrack_expect_events {
96	IPEXP_NEW,		/* new expectation */
97};
98
99#endif /* _NF_CONNTRACK_COMMON_H */
100