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
5 extension. */
6 enum ip_conntrack_info
7 {
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 /* Number of distinct IP_CT types (no NEW in reply dirn). */
23 IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1
24 };
25
26 /* Bitset representing status of connection. */
27 enum ip_conntrack_status {
28 /* It's an expected connection: bit 0 set. This bit never changed */
29 IPS_EXPECTED_BIT = 0,
30 IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
31
32 /* We've seen packets both ways: bit 1 set. Can be set, not unset. */
33 IPS_SEEN_REPLY_BIT = 1,
34 IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
35
36 /* Conntrack should never be early-expired. */
37 IPS_ASSURED_BIT = 2,
38 IPS_ASSURED = (1 << IPS_ASSURED_BIT),
39
40 /* Connection is confirmed: originating packet has left box */
41 IPS_CONFIRMED_BIT = 3,
42 IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
43
44 /* Connection needs src nat in orig dir. This bit never changed. */
45 IPS_SRC_NAT_BIT = 4,
46 IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
47
48 /* Connection needs dst nat in orig dir. This bit never changed. */
49 IPS_DST_NAT_BIT = 5,
50 IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
51
52 /* Both together. */
53 IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
54
55 /* Connection needs TCP sequence adjusted. */
56 IPS_SEQ_ADJUST_BIT = 6,
57 IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
58
59 /* NAT initialization bits. */
60 IPS_SRC_NAT_DONE_BIT = 7,
61 IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
62
63 IPS_DST_NAT_DONE_BIT = 8,
64 IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
65
66 /* Both together */
67 IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
68
69 /* Connection is dying (removed from lists), can not be unset. */
70 IPS_DYING_BIT = 9,
71 IPS_DYING = (1 << IPS_DYING_BIT),
72
73 /* Connection has fixed timeout. */
74 IPS_FIXED_TIMEOUT_BIT = 10,
75 IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
76 };
77
78 /* Connection tracking event bits */
79 enum ip_conntrack_events
80 {
81 /* New conntrack */
82 IPCT_NEW_BIT = 0,
83 IPCT_NEW = (1 << IPCT_NEW_BIT),
84
85 /* Expected connection */
86 IPCT_RELATED_BIT = 1,
87 IPCT_RELATED = (1 << IPCT_RELATED_BIT),
88
89 /* Destroyed conntrack */
90 IPCT_DESTROY_BIT = 2,
91 IPCT_DESTROY = (1 << IPCT_DESTROY_BIT),
92
93 /* Timer has been refreshed */
94 IPCT_REFRESH_BIT = 3,
95 IPCT_REFRESH = (1 << IPCT_REFRESH_BIT),
96
97 /* Status has changed */
98 IPCT_STATUS_BIT = 4,
99 IPCT_STATUS = (1 << IPCT_STATUS_BIT),
100
101 /* Update of protocol info */
102 IPCT_PROTOINFO_BIT = 5,
103 IPCT_PROTOINFO = (1 << IPCT_PROTOINFO_BIT),
104
105 /* Volatile protocol info */
106 IPCT_PROTOINFO_VOLATILE_BIT = 6,
107 IPCT_PROTOINFO_VOLATILE = (1 << IPCT_PROTOINFO_VOLATILE_BIT),
108
109 /* New helper for conntrack */
110 IPCT_HELPER_BIT = 7,
111 IPCT_HELPER = (1 << IPCT_HELPER_BIT),
112
113 /* Update of helper info */
114 IPCT_HELPINFO_BIT = 8,
115 IPCT_HELPINFO = (1 << IPCT_HELPINFO_BIT),
116
117 /* Volatile helper info */
118 IPCT_HELPINFO_VOLATILE_BIT = 9,
119 IPCT_HELPINFO_VOLATILE = (1 << IPCT_HELPINFO_VOLATILE_BIT),
120
121 /* NAT info */
122 IPCT_NATINFO_BIT = 10,
123 IPCT_NATINFO = (1 << IPCT_NATINFO_BIT),
124
125 /* Counter highest bit has been set */
126 IPCT_COUNTER_FILLING_BIT = 11,
127 IPCT_COUNTER_FILLING = (1 << IPCT_COUNTER_FILLING_BIT),
128
129 /* Mark is set */
130 IPCT_MARK_BIT = 12,
131 IPCT_MARK = (1 << IPCT_MARK_BIT),
132
133 /* NAT sequence adjustment */
134 IPCT_NATSEQADJ_BIT = 13,
135 IPCT_NATSEQADJ = (1 << IPCT_NATSEQADJ_BIT),
136
137 /* Secmark is set */
138 IPCT_SECMARK_BIT = 14,
139 IPCT_SECMARK = (1 << IPCT_SECMARK_BIT),
140 };
141
142 enum ip_conntrack_expect_events {
143 IPEXP_NEW_BIT = 0,
144 IPEXP_NEW = (1 << IPEXP_NEW_BIT),
145 };
146
147 #ifdef __KERNEL__
148 struct ip_conntrack_counter
149 {
150 u_int32_t packets;
151 u_int32_t bytes;
152 };
153
154 struct ip_conntrack_stat
155 {
156 unsigned int searched;
157 unsigned int found;
158 unsigned int new;
159 unsigned int invalid;
160 unsigned int ignore;
161 unsigned int delete;
162 unsigned int delete_list;
163 unsigned int insert;
164 unsigned int insert_failed;
165 unsigned int drop;
166 unsigned int early_drop;
167 unsigned int error;
168 unsigned int expect_new;
169 unsigned int expect_create;
170 unsigned int expect_delete;
171 };
172
173 /* call to create an explicit dependency on nf_conntrack. */
174 extern void need_conntrack(void);
175
176 #endif /* __KERNEL__ */
177
178 #endif /* _NF_CONNTRACK_COMMON_H */
179
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