1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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, |
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, |
32 | #else |
33 | IP_CT_UNTRACKED = 7, |
34 | #endif |
35 | }; |
36 | |
37 | #define NF_CT_STATE_INVALID_BIT (1 << 0) |
38 | #define NF_CT_STATE_BIT(ctinfo) (1 << ((ctinfo) % IP_CT_IS_REPLY + 1)) |
39 | #define NF_CT_STATE_UNTRACKED_BIT (1 << 6) |
40 | |
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 | |
96 | /* Conntrack is a fake untracked entry. Obsolete and not used anymore */ |
97 | IPS_UNTRACKED_BIT = 12, |
98 | IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT), |
99 | |
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 | |
109 | /* Conntrack got a helper explicitly attached (ruleset, ctnetlink). */ |
110 | IPS_HELPER_BIT = 13, |
111 | IPS_HELPER = (1 << IPS_HELPER_BIT), |
112 | |
113 | /* Conntrack has been offloaded to flow table. */ |
114 | IPS_OFFLOAD_BIT = 14, |
115 | IPS_OFFLOAD = (1 << IPS_OFFLOAD_BIT), |
116 | |
117 | /* Conntrack has been offloaded to hardware. */ |
118 | IPS_HW_OFFLOAD_BIT = 15, |
119 | IPS_HW_OFFLOAD = (1 << IPS_HW_OFFLOAD_BIT), |
120 | |
121 | /* Be careful here, modifying these bits can make things messy, |
122 | * so don't let users modify them directly. |
123 | */ |
124 | IPS_UNCHANGEABLE_MASK = (IPS_NAT_DONE_MASK | IPS_NAT_MASK | |
125 | IPS_EXPECTED | IPS_CONFIRMED | IPS_DYING | |
126 | IPS_SEQ_ADJUST | IPS_TEMPLATE | IPS_UNTRACKED | |
127 | IPS_OFFLOAD | IPS_HW_OFFLOAD), |
128 | |
129 | __IPS_MAX_BIT = 16, |
130 | }; |
131 | |
132 | /* Connection tracking event types */ |
133 | enum ip_conntrack_events { |
134 | IPCT_NEW, /* new conntrack */ |
135 | IPCT_RELATED, /* related conntrack */ |
136 | IPCT_DESTROY, /* destroyed conntrack */ |
137 | IPCT_REPLY, /* connection has seen two-way traffic */ |
138 | IPCT_ASSURED, /* connection status has changed to assured */ |
139 | IPCT_PROTOINFO, /* protocol information has changed */ |
140 | IPCT_HELPER, /* new helper has been set */ |
141 | IPCT_MARK, /* new mark has been set */ |
142 | IPCT_SEQADJ, /* sequence adjustment has changed */ |
143 | IPCT_NATSEQADJ = IPCT_SEQADJ, |
144 | IPCT_SECMARK, /* new security mark has been set */ |
145 | IPCT_LABEL, /* new connlabel has been set */ |
146 | IPCT_SYNPROXY, /* synproxy has been set */ |
147 | #ifdef __KERNEL__ |
148 | __IPCT_MAX |
149 | #endif |
150 | }; |
151 | |
152 | enum ip_conntrack_expect_events { |
153 | IPEXP_NEW, /* new expectation */ |
154 | IPEXP_DESTROY, /* destroyed expectation */ |
155 | }; |
156 | |
157 | /* expectation flags */ |
158 | #define NF_CT_EXPECT_PERMANENT 0x1 |
159 | #define NF_CT_EXPECT_INACTIVE 0x2 |
160 | #define NF_CT_EXPECT_USERSPACE 0x4 |
161 | |
162 | |
163 | #endif /* _UAPI_NF_CONNTRACK_COMMON_H */ |
164 | |