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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. */ | |
6 | enum 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, | |
bfa3f9d7 JR |
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 | |
94d0ec58 DH |
32 | }; |
33 | ||
96518518 PM |
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 | ||
94d0ec58 DH |
38 | /* Bitset representing status of connection. */ |
39 | enum 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 */ | |
103 | enum 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 */ | |
41d73ec0 PM |
112 | IPCT_SEQADJ, /* sequence adjustment has changed */ |
113 | IPCT_NATSEQADJ = IPCT_SEQADJ, | |
94d0ec58 | 114 | IPCT_SECMARK, /* new security mark has been set */ |
0ceabd83 | 115 | IPCT_LABEL, /* new connlabel has been set */ |
94d0ec58 DH |
116 | }; |
117 | ||
118 | enum 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 */ |