1 /*
2 * connection tracking helpers.
3 *
4 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
5 * - generalize L3 protocol dependent part.
6 *
7 * Derived from include/linux/netfiter_ipv4/ip_conntrack_helper.h
8 */
9
10 #ifndef _NF_CONNTRACK_HELPER_H
11 #define _NF_CONNTRACK_HELPER_H
12 #include <net/netfilter/nf_conntrack.h>
13 #include <net/netfilter/nf_conntrack_extend.h>
14
15 struct module;
16
17 #define NF_CT_HELPER_NAME_LEN 16
18
19 struct nf_conntrack_helper
20 {
21 struct hlist_node hnode; /* Internal use. */
22
23 const char *name; /* name of the module */
24 struct module *me; /* pointer to self */
25 const struct nf_conntrack_expect_policy *expect_policy;
26
27 /* Tuple of things we will help (compared against server response) */
28 struct nf_conntrack_tuple tuple;
29
30 /* Function to call when data passes; return verdict, or -1 to
31 invalidate. */
32 int (*help)(struct sk_buff *skb,
33 unsigned int protoff,
34 struct nf_conn *ct,
35 enum ip_conntrack_info conntrackinfo);
36
37 void (*destroy)(struct nf_conn *ct);
38
39 int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct);
40 unsigned int expect_class_max;
41 };
42
43 extern struct nf_conntrack_helper *
44 __nf_conntrack_helper_find_byname(const char *name);
45
46 extern int nf_conntrack_helper_register(struct nf_conntrack_helper *);
47 extern void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
48
49 extern struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp);
50
51 extern int __nf_ct_try_assign_helper(struct nf_conn *ct, gfp_t flags);
52
53 extern void nf_ct_helper_destroy(struct nf_conn *ct);
54
55 static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
56 {
57 return nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
58 }
59
60 extern int nf_conntrack_helper_init(void);
61 extern void nf_conntrack_helper_fini(void);
62
63 #endif /*_NF_CONNTRACK_HELPER_H*/
64
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