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>
16 struct nf_conntrack_helper
18 struct list_head list; /* Internal use. */
20 const char *name; /* name of the module */
21 struct module *me; /* pointer to self */
22 unsigned int max_expected; /* Maximum number of concurrent
23 * expected connections */
24 unsigned int timeout; /* timeout for expecteds */
26 /* Mask of things we will help (compared against server response) */
27 struct nf_conntrack_tuple tuple;
28 struct nf_conntrack_tuple mask;
30 /* Function to call when data passes; return verdict, or -1 to
32 int (*help)(struct sk_buff **pskb,
35 enum ip_conntrack_info conntrackinfo);
38 extern int nf_conntrack_helper_register(struct nf_conntrack_helper *);
39 extern void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
41 /* Allocate space for an expectation: this is mandatory before calling
42 nf_conntrack_expect_related. You will have to call put afterwards. */
43 extern struct nf_conntrack_expect *
44 nf_conntrack_expect_alloc(struct nf_conn *master);
45 extern void nf_conntrack_expect_put(struct nf_conntrack_expect *exp);
47 /* Add an expected connection: can have more than one per connection */
48 extern int nf_conntrack_expect_related(struct nf_conntrack_expect *exp);
49 extern void nf_conntrack_unexpect_related(struct nf_conntrack_expect *exp);
51 #endif /*_NF_CONNTRACK_HELPER_H*/