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
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 /* Number of distinct IP_CT types (no NEW in reply dirn). */
23 IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1
26 /* Bitset representing status of connection. */
27 enum ip_conntrack_status {
28 /* It's an expected connection: bit 0 set. This bit never changed */
30 IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
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),
36 /* Conntrack should never be early-expired. */
38 IPS_ASSURED = (1 << IPS_ASSURED_BIT),
40 /* Connection is confirmed: originating packet has left box */
41 IPS_CONFIRMED_BIT = 3,
42 IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
44 /* Connection needs src nat in orig dir. This bit never changed. */
46 IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
48 /* Connection needs dst nat in orig dir. This bit never changed. */
50 IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
53 IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
55 /* Connection needs TCP sequence adjusted. */
56 IPS_SEQ_ADJUST_BIT = 6,
57 IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
59 /* NAT initialization bits. */
60 IPS_SRC_NAT_DONE_BIT = 7,
61 IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
63 IPS_DST_NAT_DONE_BIT = 8,
64 IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
67 IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
69 /* Connection is dying (removed from lists), can not be unset. */
71 IPS_DYING = (1 << IPS_DYING_BIT),
74 /* Connection tracking event bits */
75 enum ip_conntrack_events
79 IPCT_NEW = (1 << IPCT_NEW_BIT),
81 /* Expected connection */
83 IPCT_RELATED = (1 << IPCT_RELATED_BIT),
85 /* Destroyed conntrack */
87 IPCT_DESTROY = (1 << IPCT_DESTROY_BIT),
89 /* Timer has been refreshed */
91 IPCT_REFRESH = (1 << IPCT_REFRESH_BIT),
93 /* Status has changed */
95 IPCT_STATUS = (1 << IPCT_STATUS_BIT),
97 /* Update of protocol info */
98 IPCT_PROTOINFO_BIT = 5,
99 IPCT_PROTOINFO = (1 << IPCT_PROTOINFO_BIT),
101 /* Volatile protocol info */
102 IPCT_PROTOINFO_VOLATILE_BIT = 6,
103 IPCT_PROTOINFO_VOLATILE = (1 << IPCT_PROTOINFO_VOLATILE_BIT),
105 /* New helper for conntrack */
107 IPCT_HELPER = (1 << IPCT_HELPER_BIT),
109 /* Update of helper info */
110 IPCT_HELPINFO_BIT = 8,
111 IPCT_HELPINFO = (1 << IPCT_HELPINFO_BIT),
113 /* Volatile helper info */
114 IPCT_HELPINFO_VOLATILE_BIT = 9,
115 IPCT_HELPINFO_VOLATILE = (1 << IPCT_HELPINFO_VOLATILE_BIT),
118 IPCT_NATINFO_BIT = 10,
119 IPCT_NATINFO = (1 << IPCT_NATINFO_BIT),
121 /* Counter highest bit has been set */
122 IPCT_COUNTER_FILLING_BIT = 11,
123 IPCT_COUNTER_FILLING = (1 << IPCT_COUNTER_FILLING_BIT),
126 enum ip_conntrack_expect_events {
128 IPEXP_NEW = (1 << IPEXP_NEW_BIT),
132 struct ip_conntrack_counter
138 struct ip_conntrack_stat
140 unsigned int searched;
143 unsigned int invalid;
146 unsigned int delete_list;
148 unsigned int insert_failed;
150 unsigned int early_drop;
152 unsigned int expect_new;
153 unsigned int expect_create;
154 unsigned int expect_delete;
157 /* call to create an explicit dependency on nf_conntrack. */
158 extern void need_conntrack(void);
160 #endif /* __KERNEL__ */
162 #endif /* _NF_CONNTRACK_COMMON_H */