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 /* Conntrack expectation list member */
14 struct hlist_node lnode;
15
16 /* Hash member */
17 struct hlist_node hnode;
18
19 /* We expect this tuple, with the following mask */
20 struct nf_conntrack_tuple tuple;
21 struct nf_conntrack_tuple_mask mask;
22
23 /* Function to call after setup and insertion */
24 void (*expectfn)(struct nf_conn *new,
25 struct nf_conntrack_expect *this);
26
27 /* Helper to assign to new connection */
28 struct nf_conntrack_helper *helper;
29
30 /* The conntrack of the master connection */
31 struct nf_conn *master;
32
33 /* Timer function; deletes the expectation. */
34 struct timer_list timeout;
35
36 /* Usage count. */
37 atomic_t use;
38
39 /* Flags */
40 unsigned int flags;
41
42 /* Expectation class */
43 unsigned int class;
44
45 #ifdef CONFIG_NF_NAT_NEEDED
46 union nf_inet_addr saved_addr;
47 /* This is the original per-proto part, used to map the
48 * expected connection the way the recipient expects. */
49 union nf_conntrack_man_proto saved_proto;
50 /* Direction relative to the master connection. */
51 enum ip_conntrack_dir dir;
52 #endif
53
54 struct rcu_head rcu;
55 };
56
nf_ct_exp_net(struct nf_conntrack_expect * exp)57 static inline struct net *nf_ct_exp_net(struct nf_conntrack_expect *exp)
58 {
59 return nf_ct_net(exp->master);
60 }
61
62 #define NF_CT_EXP_POLICY_NAME_LEN 16
63
64 struct nf_conntrack_expect_policy {
65 unsigned int max_expected;
66 unsigned int timeout;
67 char name[NF_CT_EXP_POLICY_NAME_LEN];
68 };
69
70 #define NF_CT_EXPECT_CLASS_DEFAULT 0
71
72 int nf_conntrack_expect_pernet_init(struct net *net);
73 void nf_conntrack_expect_pernet_fini(struct net *net);
74
75 int nf_conntrack_expect_init(void);
76 void nf_conntrack_expect_fini(void);
77
78 struct nf_conntrack_expect *
79 __nf_ct_expect_find(struct net *net, u16 zone,
80 const struct nf_conntrack_tuple *tuple);
81
82 struct nf_conntrack_expect *
83 nf_ct_expect_find_get(struct net *net, u16 zone,
84 const struct nf_conntrack_tuple *tuple);
85
86 struct nf_conntrack_expect *
87 nf_ct_find_expectation(struct net *net, u16 zone,
88 const struct nf_conntrack_tuple *tuple);
89
90 void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp,
91 u32 portid, int report);
nf_ct_unlink_expect(struct nf_conntrack_expect * exp)92 static inline void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
93 {
94 nf_ct_unlink_expect_report(exp, 0, 0);
95 }
96
97 void nf_ct_remove_expectations(struct nf_conn *ct);
98 void nf_ct_unexpect_related(struct nf_conntrack_expect *exp);
99
100 /* Allocate space for an expectation: this is mandatory before calling
101 nf_ct_expect_related. You will have to call put afterwards. */
102 struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me);
103 void nf_ct_expect_init(struct nf_conntrack_expect *, unsigned int, u_int8_t,
104 const union nf_inet_addr *,
105 const union nf_inet_addr *,
106 u_int8_t, const __be16 *, const __be16 *);
107 void nf_ct_expect_put(struct nf_conntrack_expect *exp);
108 int nf_ct_expect_related_report(struct nf_conntrack_expect *expect,
109 u32 portid, int report);
nf_ct_expect_related(struct nf_conntrack_expect * expect)110 static inline int nf_ct_expect_related(struct nf_conntrack_expect *expect)
111 {
112 return nf_ct_expect_related_report(expect, 0, 0);
113 }
114
115 #endif /*_NF_CONNTRACK_EXPECT_H*/
116
117