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
6 enum ip_conntrack_info {
7 /* Part of an established connection (either direction). */
10 /* Like NEW, but related to an existing connection, or ICMP error
11 (in either direction). */
14 /* Started a new connection to track (only
15 IP_CT_DIR_ORIGINAL); may be a retransmission. */
18 /* >= this indicates reply direction */
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
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))
32 /* Bitset representing status of connection. */
33 enum ip_conntrack_status {
34 /* It's an expected connection: bit 0 set. This bit never changed */
36 IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
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),
42 /* Conntrack should never be early-expired. */
44 IPS_ASSURED = (1 << IPS_ASSURED_BIT),
46 /* Connection is confirmed: originating packet has left box */
47 IPS_CONFIRMED_BIT = 3,
48 IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
50 /* Connection needs src nat in orig dir. This bit never changed. */
52 IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
54 /* Connection needs dst nat in orig dir. This bit never changed. */
56 IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
59 IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
61 /* Connection needs TCP sequence adjusted. */
62 IPS_SEQ_ADJUST_BIT = 6,
63 IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
65 /* NAT initialization bits. */
66 IPS_SRC_NAT_DONE_BIT = 7,
67 IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
69 IPS_DST_NAT_DONE_BIT = 8,
70 IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
73 IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
75 /* Connection is dying (removed from lists), can not be unset. */
77 IPS_DYING = (1 << IPS_DYING_BIT),
79 /* Connection has fixed timeout. */
80 IPS_FIXED_TIMEOUT_BIT = 10,
81 IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
83 /* Conntrack is a template */
84 IPS_TEMPLATE_BIT = 11,
85 IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT),
87 /* Conntrack is a fake untracked entry */
88 IPS_UNTRACKED_BIT = 12,
89 IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT),
91 /* Conntrack got a helper explicitly attached via CT target. */
93 IPS_HELPER = (1 << IPS_HELPER_BIT),
96 /* Connection tracking event types */
97 enum 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 */
112 enum ip_conntrack_expect_events {
113 IPEXP_NEW, /* new expectation */
114 IPEXP_DESTROY, /* destroyed expectation */
117 /* expectation flags */
118 #define NF_CT_EXPECT_PERMANENT 0x1
119 #define NF_CT_EXPECT_INACTIVE 0x2
120 #define NF_CT_EXPECT_USERSPACE 0x4
123 #endif /* _UAPI_NF_CONNTRACK_COMMON_H */