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
7 enum ip_conntrack_info
{
8 /* Part of an established connection (either direction). */
11 /* Like NEW, but related to an existing connection, or ICMP error
12 (in either direction). */
15 /* Started a new connection to track (only
16 IP_CT_DIR_ORIGINAL); may be a retransmission. */
19 /* >= this indicates reply direction */
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. */
26 /* Number of distinct IP_CT types. */
29 /* only for userspace compatibility */
31 IP_CT_NEW_REPLY
= IP_CT_NUMBER
,
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)
41 /* Bitset representing status of connection. */
42 enum ip_conntrack_status
{
43 /* It's an expected connection: bit 0 set. This bit never changed */
45 IPS_EXPECTED
= (1 << IPS_EXPECTED_BIT
),
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
),
51 /* Conntrack should never be early-expired. */
53 IPS_ASSURED
= (1 << IPS_ASSURED_BIT
),
55 /* Connection is confirmed: originating packet has left box */
56 IPS_CONFIRMED_BIT
= 3,
57 IPS_CONFIRMED
= (1 << IPS_CONFIRMED_BIT
),
59 /* Connection needs src nat in orig dir. This bit never changed. */
61 IPS_SRC_NAT
= (1 << IPS_SRC_NAT_BIT
),
63 /* Connection needs dst nat in orig dir. This bit never changed. */
65 IPS_DST_NAT
= (1 << IPS_DST_NAT_BIT
),
68 IPS_NAT_MASK
= (IPS_DST_NAT
| IPS_SRC_NAT
),
70 /* Connection needs TCP sequence adjusted. */
71 IPS_SEQ_ADJUST_BIT
= 6,
72 IPS_SEQ_ADJUST
= (1 << IPS_SEQ_ADJUST_BIT
),
74 /* NAT initialization bits. */
75 IPS_SRC_NAT_DONE_BIT
= 7,
76 IPS_SRC_NAT_DONE
= (1 << IPS_SRC_NAT_DONE_BIT
),
78 IPS_DST_NAT_DONE_BIT
= 8,
79 IPS_DST_NAT_DONE
= (1 << IPS_DST_NAT_DONE_BIT
),
82 IPS_NAT_DONE_MASK
= (IPS_DST_NAT_DONE
| IPS_SRC_NAT_DONE
),
84 /* Connection is dying (removed from lists), can not be unset. */
86 IPS_DYING
= (1 << IPS_DYING_BIT
),
88 /* Connection has fixed timeout. */
89 IPS_FIXED_TIMEOUT_BIT
= 10,
90 IPS_FIXED_TIMEOUT
= (1 << IPS_FIXED_TIMEOUT_BIT
),
92 /* Conntrack is a template */
93 IPS_TEMPLATE_BIT
= 11,
94 IPS_TEMPLATE
= (1 << IPS_TEMPLATE_BIT
),
96 /* Conntrack is a fake untracked entry. Obsolete and not used anymore */
97 IPS_UNTRACKED_BIT
= 12,
98 IPS_UNTRACKED
= (1 << IPS_UNTRACKED_BIT
),
100 /* Conntrack got a helper explicitly attached via CT target. */
102 IPS_HELPER
= (1 << IPS_HELPER_BIT
),
104 /* Be careful here, modifying these bits can make things messy,
105 * so don't let users modify them directly.
107 IPS_UNCHANGEABLE_MASK
= (IPS_NAT_DONE_MASK
| IPS_NAT_MASK
|
108 IPS_EXPECTED
| IPS_CONFIRMED
| IPS_DYING
|
109 IPS_SEQ_ADJUST
| IPS_TEMPLATE
),
114 /* Connection tracking event types */
115 enum ip_conntrack_events
{
116 IPCT_NEW
, /* new conntrack */
117 IPCT_RELATED
, /* related conntrack */
118 IPCT_DESTROY
, /* destroyed conntrack */
119 IPCT_REPLY
, /* connection has seen two-way traffic */
120 IPCT_ASSURED
, /* connection status has changed to assured */
121 IPCT_PROTOINFO
, /* protocol information has changed */
122 IPCT_HELPER
, /* new helper has been set */
123 IPCT_MARK
, /* new mark has been set */
124 IPCT_SEQADJ
, /* sequence adjustment has changed */
125 IPCT_NATSEQADJ
= IPCT_SEQADJ
,
126 IPCT_SECMARK
, /* new security mark has been set */
127 IPCT_LABEL
, /* new connlabel has been set */
133 enum ip_conntrack_expect_events
{
134 IPEXP_NEW
, /* new expectation */
135 IPEXP_DESTROY
, /* destroyed expectation */
138 /* expectation flags */
139 #define NF_CT_EXPECT_PERMANENT 0x1
140 #define NF_CT_EXPECT_INACTIVE 0x2
141 #define NF_CT_EXPECT_USERSPACE 0x4
144 #endif /* _UAPI_NF_CONNTRACK_COMMON_H */