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 /* Number of distinct IP_CT types (no NEW in reply dirn). */
22 IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1
25 /* Bitset representing status of connection. */
26 enum ip_conntrack_status {
27 /* It's an expected connection: bit 0 set. This bit never changed */
29 IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
31 /* We've seen packets both ways: bit 1 set. Can be set, not unset. */
32 IPS_SEEN_REPLY_BIT = 1,
33 IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
35 /* Conntrack should never be early-expired. */
37 IPS_ASSURED = (1 << IPS_ASSURED_BIT),
39 /* Connection is confirmed: originating packet has left box */
40 IPS_CONFIRMED_BIT = 3,
41 IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
43 /* Connection needs src nat in orig dir. This bit never changed. */
45 IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
47 /* Connection needs dst nat in orig dir. This bit never changed. */
49 IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
52 IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
54 /* Connection needs TCP sequence adjusted. */
55 IPS_SEQ_ADJUST_BIT = 6,
56 IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
58 /* NAT initialization bits. */
59 IPS_SRC_NAT_DONE_BIT = 7,
60 IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
62 IPS_DST_NAT_DONE_BIT = 8,
63 IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
66 IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
68 /* Connection is dying (removed from lists), can not be unset. */
70 IPS_DYING = (1 << IPS_DYING_BIT),
72 /* Connection has fixed timeout. */
73 IPS_FIXED_TIMEOUT_BIT = 10,
74 IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
78 struct ip_conntrack_stat {
79 unsigned int searched;
85 unsigned int delete_list;
87 unsigned int insert_failed;
89 unsigned int early_drop;
91 unsigned int expect_new;
92 unsigned int expect_create;
93 unsigned int expect_delete;
96 /* call to create an explicit dependency on nf_conntrack. */
97 extern void need_conntrack(void);
99 #endif /* __KERNEL__ */
101 #endif /* _NF_CONNTRACK_COMMON_H */