2 * connection tracking helpers.
4 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
5 * - generalize L3 protocol dependent part.
7 * Derived from include/linux/netfiter_ipv4/ip_conntrack_helper.h
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>
17 #define NF_CT_HELPER_NAME_LEN 16
19 struct nf_conntrack_helper {
20 struct hlist_node hnode; /* Internal use. */
22 const char *name; /* name of the module */
23 struct module *me; /* pointer to self */
24 const struct nf_conntrack_expect_policy *expect_policy;
26 /* Tuple of things we will help (compared against server response) */
27 struct nf_conntrack_tuple tuple;
29 /* Function to call when data passes; return verdict, or -1 to
31 int (*help)(struct sk_buff *skb,
34 enum ip_conntrack_info conntrackinfo);
36 void (*destroy)(struct nf_conn *ct);
38 int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct);
39 unsigned int expect_class_max;
42 extern struct nf_conntrack_helper *
43 __nf_conntrack_helper_find_byname(const char *name);
45 extern int nf_conntrack_helper_register(struct nf_conntrack_helper *);
46 extern void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
48 extern struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp);
50 extern int __nf_ct_try_assign_helper(struct nf_conn *ct, gfp_t flags);
52 extern void nf_ct_helper_destroy(struct nf_conn *ct);
54 static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
56 return nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
59 extern int nf_conntrack_helper_init(void);
60 extern void nf_conntrack_helper_fini(void);
62 #endif /*_NF_CONNTRACK_HELPER_H*/