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6f52b16c | 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
94d0ec58 DH |
2 | #ifndef _UAPI_NF_CONNTRACK_COMMON_H |
3 | #define _UAPI_NF_CONNTRACK_COMMON_H | |
4 | /* Connection state tracking for netfilter. This is separated from, | |
5 | but required by, the NAT layer; it can also be used by an iptables | |
6 | extension. */ | |
7 | enum ip_conntrack_info { | |
8 | /* Part of an established connection (either direction). */ | |
9 | IP_CT_ESTABLISHED, | |
10 | ||
11 | /* Like NEW, but related to an existing connection, or ICMP error | |
12 | (in either direction). */ | |
13 | IP_CT_RELATED, | |
14 | ||
15 | /* Started a new connection to track (only | |
16 | IP_CT_DIR_ORIGINAL); may be a retransmission. */ | |
17 | IP_CT_NEW, | |
18 | ||
19 | /* >= this indicates reply direction */ | |
20 | IP_CT_IS_REPLY, | |
21 | ||
22 | IP_CT_ESTABLISHED_REPLY = IP_CT_ESTABLISHED + IP_CT_IS_REPLY, | |
23 | IP_CT_RELATED_REPLY = IP_CT_RELATED + IP_CT_IS_REPLY, | |
bfa3f9d7 JR |
24 | /* No NEW in reply direction. */ |
25 | ||
26 | /* Number of distinct IP_CT types. */ | |
27 | IP_CT_NUMBER, | |
28 | ||
29 | /* only for userspace compatibility */ | |
30 | #ifndef __KERNEL__ | |
31 | IP_CT_NEW_REPLY = IP_CT_NUMBER, | |
cc41c84b FW |
32 | #else |
33 | IP_CT_UNTRACKED = 7, | |
bfa3f9d7 | 34 | #endif |
94d0ec58 DH |
35 | }; |
36 | ||
96518518 PM |
37 | #define NF_CT_STATE_INVALID_BIT (1 << 0) |
38 | #define NF_CT_STATE_BIT(ctinfo) (1 << ((ctinfo) % IP_CT_IS_REPLY + 1)) | |
4c82fd0a | 39 | #define NF_CT_STATE_UNTRACKED_BIT (1 << 6) |
96518518 | 40 | |
94d0ec58 DH |
41 | /* Bitset representing status of connection. */ |
42 | enum ip_conntrack_status { | |
43 | /* It's an expected connection: bit 0 set. This bit never changed */ | |
44 | IPS_EXPECTED_BIT = 0, | |
45 | IPS_EXPECTED = (1 << IPS_EXPECTED_BIT), | |
46 | ||
47 | /* We've seen packets both ways: bit 1 set. Can be set, not unset. */ | |
48 | IPS_SEEN_REPLY_BIT = 1, | |
49 | IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT), | |
50 | ||
51 | /* Conntrack should never be early-expired. */ | |
52 | IPS_ASSURED_BIT = 2, | |
53 | IPS_ASSURED = (1 << IPS_ASSURED_BIT), | |
54 | ||
55 | /* Connection is confirmed: originating packet has left box */ | |
56 | IPS_CONFIRMED_BIT = 3, | |
57 | IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT), | |
58 | ||
59 | /* Connection needs src nat in orig dir. This bit never changed. */ | |
60 | IPS_SRC_NAT_BIT = 4, | |
61 | IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT), | |
62 | ||
63 | /* Connection needs dst nat in orig dir. This bit never changed. */ | |
64 | IPS_DST_NAT_BIT = 5, | |
65 | IPS_DST_NAT = (1 << IPS_DST_NAT_BIT), | |
66 | ||
67 | /* Both together. */ | |
68 | IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT), | |
69 | ||
70 | /* Connection needs TCP sequence adjusted. */ | |
71 | IPS_SEQ_ADJUST_BIT = 6, | |
72 | IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT), | |
73 | ||
74 | /* NAT initialization bits. */ | |
75 | IPS_SRC_NAT_DONE_BIT = 7, | |
76 | IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT), | |
77 | ||
78 | IPS_DST_NAT_DONE_BIT = 8, | |
79 | IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT), | |
80 | ||
81 | /* Both together */ | |
82 | IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE), | |
83 | ||
84 | /* Connection is dying (removed from lists), can not be unset. */ | |
85 | IPS_DYING_BIT = 9, | |
86 | IPS_DYING = (1 << IPS_DYING_BIT), | |
87 | ||
88 | /* Connection has fixed timeout. */ | |
89 | IPS_FIXED_TIMEOUT_BIT = 10, | |
90 | IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT), | |
91 | ||
92 | /* Conntrack is a template */ | |
93 | IPS_TEMPLATE_BIT = 11, | |
94 | IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT), | |
95 | ||
cc41c84b | 96 | /* Conntrack is a fake untracked entry. Obsolete and not used anymore */ |
94d0ec58 DH |
97 | IPS_UNTRACKED_BIT = 12, |
98 | IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT), | |
99 | ||
6a757c07 FW |
100 | #ifdef __KERNEL__ |
101 | /* Re-purposed for in-kernel use: | |
102 | * Tags a conntrack entry that clashed with an existing entry | |
103 | * on insert. | |
104 | */ | |
105 | IPS_NAT_CLASH_BIT = IPS_UNTRACKED_BIT, | |
106 | IPS_NAT_CLASH = IPS_UNTRACKED, | |
107 | #endif | |
108 | ||
94d0ec58 DH |
109 | /* Conntrack got a helper explicitly attached via CT target. */ |
110 | IPS_HELPER_BIT = 13, | |
111 | IPS_HELPER = (1 << IPS_HELPER_BIT), | |
53b56da8 | 112 | |
90964016 PNA |
113 | /* Conntrack has been offloaded to flow table. */ |
114 | IPS_OFFLOAD_BIT = 14, | |
115 | IPS_OFFLOAD = (1 << IPS_OFFLOAD_BIT), | |
116 | ||
53b56da8 LZ |
117 | /* Be careful here, modifying these bits can make things messy, |
118 | * so don't let users modify them directly. | |
119 | */ | |
120 | IPS_UNCHANGEABLE_MASK = (IPS_NAT_DONE_MASK | IPS_NAT_MASK | | |
121 | IPS_EXPECTED | IPS_CONFIRMED | IPS_DYING | | |
6a757c07 FW |
122 | IPS_SEQ_ADJUST | IPS_TEMPLATE | IPS_UNTRACKED | |
123 | IPS_OFFLOAD), | |
53b56da8 | 124 | |
64e6dd1f | 125 | __IPS_MAX_BIT = 15, |
94d0ec58 DH |
126 | }; |
127 | ||
128 | /* Connection tracking event types */ | |
129 | enum ip_conntrack_events { | |
130 | IPCT_NEW, /* new conntrack */ | |
131 | IPCT_RELATED, /* related conntrack */ | |
132 | IPCT_DESTROY, /* destroyed conntrack */ | |
133 | IPCT_REPLY, /* connection has seen two-way traffic */ | |
134 | IPCT_ASSURED, /* connection status has changed to assured */ | |
135 | IPCT_PROTOINFO, /* protocol information has changed */ | |
136 | IPCT_HELPER, /* new helper has been set */ | |
137 | IPCT_MARK, /* new mark has been set */ | |
41d73ec0 PM |
138 | IPCT_SEQADJ, /* sequence adjustment has changed */ |
139 | IPCT_NATSEQADJ = IPCT_SEQADJ, | |
94d0ec58 | 140 | IPCT_SECMARK, /* new security mark has been set */ |
0ceabd83 | 141 | IPCT_LABEL, /* new connlabel has been set */ |
20710b3b | 142 | IPCT_SYNPROXY, /* synproxy has been set */ |
01026ede FW |
143 | #ifdef __KERNEL__ |
144 | __IPCT_MAX | |
145 | #endif | |
94d0ec58 DH |
146 | }; |
147 | ||
148 | enum ip_conntrack_expect_events { | |
149 | IPEXP_NEW, /* new expectation */ | |
150 | IPEXP_DESTROY, /* destroyed expectation */ | |
151 | }; | |
152 | ||
153 | /* expectation flags */ | |
154 | #define NF_CT_EXPECT_PERMANENT 0x1 | |
155 | #define NF_CT_EXPECT_INACTIVE 0x2 | |
156 | #define NF_CT_EXPECT_USERSPACE 0x4 | |
157 | ||
158 | ||
159 | #endif /* _UAPI_NF_CONNTRACK_COMMON_H */ |