]> nv-tegra.nvidia Code Review - linux-2.6.git/blob - include/net/netfilter/nf_conntrack_expect.h
netfilter: ctnetlink: fix regression in expectation handling
[linux-2.6.git] / include / net / netfilter / nf_conntrack_expect.h
1 /*
2  * connection tracking expectations.
3  */
4
5 #ifndef _NF_CONNTRACK_EXPECT_H
6 #define _NF_CONNTRACK_EXPECT_H
7 #include <net/netfilter/nf_conntrack.h>
8
9 extern unsigned int nf_ct_expect_hsize;
10 extern unsigned int nf_ct_expect_max;
11
12 struct nf_conntrack_expect
13 {
14         /* Conntrack expectation list member */
15         struct hlist_node lnode;
16
17         /* Hash member */
18         struct hlist_node hnode;
19
20         /* We expect this tuple, with the following mask */
21         struct nf_conntrack_tuple tuple;
22         struct nf_conntrack_tuple_mask mask;
23
24         /* Function to call after setup and insertion */
25         void (*expectfn)(struct nf_conn *new,
26                          struct nf_conntrack_expect *this);
27
28         /* Helper to assign to new connection */
29         struct nf_conntrack_helper *helper;
30
31         /* The conntrack of the master connection */
32         struct nf_conn *master;
33
34         /* Timer function; deletes the expectation. */
35         struct timer_list timeout;
36
37         /* Usage count. */
38         atomic_t use;
39
40         /* Flags */
41         unsigned int flags;
42
43         /* Expectation class */
44         unsigned int class;
45
46 #ifdef CONFIG_NF_NAT_NEEDED
47         __be32 saved_ip;
48         /* This is the original per-proto part, used to map the
49          * expected connection the way the recipient expects. */
50         union nf_conntrack_man_proto saved_proto;
51         /* Direction relative to the master connection. */
52         enum ip_conntrack_dir dir;
53 #endif
54
55         struct rcu_head rcu;
56 };
57
58 static inline struct net *nf_ct_exp_net(struct nf_conntrack_expect *exp)
59 {
60 #ifdef CONFIG_NET_NS
61         return exp->master->ct_net;     /* by definition */
62 #else
63         return &init_net;
64 #endif
65 }
66
67 struct nf_conntrack_expect_policy
68 {
69         unsigned int    max_expected;
70         unsigned int    timeout;
71 };
72
73 #define NF_CT_EXPECT_CLASS_DEFAULT      0
74
75 #define NF_CT_EXPECT_PERMANENT  0x1
76 #define NF_CT_EXPECT_INACTIVE   0x2
77
78 int nf_conntrack_expect_init(struct net *net);
79 void nf_conntrack_expect_fini(struct net *net);
80
81 struct nf_conntrack_expect *
82 __nf_ct_expect_find(struct net *net, const struct nf_conntrack_tuple *tuple);
83
84 struct nf_conntrack_expect *
85 nf_ct_expect_find_get(struct net *net, const struct nf_conntrack_tuple *tuple);
86
87 struct nf_conntrack_expect *
88 nf_ct_find_expectation(struct net *net, const struct nf_conntrack_tuple *tuple);
89
90 void nf_ct_unlink_expect(struct nf_conntrack_expect *exp);
91 void nf_ct_remove_expectations(struct nf_conn *ct);
92 void nf_ct_unexpect_related(struct nf_conntrack_expect *exp);
93
94 /* Allocate space for an expectation: this is mandatory before calling
95    nf_ct_expect_related.  You will have to call put afterwards. */
96 struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me);
97 void nf_ct_expect_init(struct nf_conntrack_expect *, unsigned int, u_int8_t,
98                        const union nf_inet_addr *,
99                        const union nf_inet_addr *,
100                        u_int8_t, const __be16 *, const __be16 *);
101 void nf_ct_expect_put(struct nf_conntrack_expect *exp);
102 int nf_ct_expect_related_report(struct nf_conntrack_expect *expect, 
103                                 u32 pid, int report);
104 static inline int nf_ct_expect_related(struct nf_conntrack_expect *expect)
105 {
106         return nf_ct_expect_related_report(expect, 0, 0);
107 }
108
109 #endif /*_NF_CONNTRACK_EXPECT_H*/
110