1 #ifndef _NF_CONNTRACK_COMMON_H
2 #define _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 /* Bitset representing status of connection. */
29 enum ip_conntrack_status {
30 /* It's an expected connection: bit 0 set. This bit never changed */
32 IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
34 /* We've seen packets both ways: bit 1 set. Can be set, not unset. */
35 IPS_SEEN_REPLY_BIT = 1,
36 IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
38 /* Conntrack should never be early-expired. */
40 IPS_ASSURED = (1 << IPS_ASSURED_BIT),
42 /* Connection is confirmed: originating packet has left box */
43 IPS_CONFIRMED_BIT = 3,
44 IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
46 /* Connection needs src nat in orig dir. This bit never changed. */
48 IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
50 /* Connection needs dst nat in orig dir. This bit never changed. */
52 IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
55 IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
57 /* Connection needs TCP sequence adjusted. */
58 IPS_SEQ_ADJUST_BIT = 6,
59 IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
61 /* NAT initialization bits. */
62 IPS_SRC_NAT_DONE_BIT = 7,
63 IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
65 IPS_DST_NAT_DONE_BIT = 8,
66 IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
69 IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
71 /* Connection is dying (removed from lists), can not be unset. */
73 IPS_DYING = (1 << IPS_DYING_BIT),
75 /* Connection has fixed timeout. */
76 IPS_FIXED_TIMEOUT_BIT = 10,
77 IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
79 /* Conntrack is a template */
80 IPS_TEMPLATE_BIT = 11,
81 IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT),
83 /* Conntrack is a fake untracked entry */
84 IPS_UNTRACKED_BIT = 12,
85 IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT),
87 /* Be careful here, modifying these bits can make things messy,
88 * so don't let users modify them directly.
90 IPS_UNCHANGEABLE_MASK = (IPS_NAT_DONE_MASK | IPS_NAT_MASK |
91 IPS_EXPECTED | IPS_CONFIRMED | IPS_DYING |
92 IPS_SEQ_ADJUST | IPS_TEMPLATE),
97 /* Connection tracking event types */
98 enum ip_conntrack_events {
99 IPCT_NEW, /* new conntrack */
100 IPCT_RELATED, /* related conntrack */
101 IPCT_DESTROY, /* destroyed conntrack */
102 IPCT_REPLY, /* connection has seen two-way traffic */
103 IPCT_ASSURED, /* connection status has changed to assured */
104 IPCT_PROTOINFO, /* protocol information has changed */
105 IPCT_HELPER, /* new helper has been set */
106 IPCT_MARK, /* new mark has been set */
107 IPCT_NATSEQADJ, /* NAT is doing sequence adjustment */
108 IPCT_SECMARK, /* new security mark has been set */
111 enum ip_conntrack_expect_events {
112 IPEXP_NEW, /* new expectation */
113 IPEXP_DESTROY, /* destroyed expectation */
116 /* expectation flags */
117 #define NF_CT_EXPECT_PERMANENT 0x1
118 #define NF_CT_EXPECT_INACTIVE 0x2
119 #define NF_CT_EXPECT_USERSPACE 0x4
122 struct ip_conntrack_stat {
123 unsigned int searched;
126 unsigned int invalid;
129 unsigned int delete_list;
131 unsigned int insert_failed;
133 unsigned int early_drop;
135 unsigned int expect_new;
136 unsigned int expect_create;
137 unsigned int expect_delete;
138 unsigned int search_restart;
141 /* call to create an explicit dependency on nf_conntrack. */
142 extern void need_conntrack(void);
144 #endif /* __KERNEL__ */
146 #endif /* _NF_CONNTRACK_COMMON_H */