/*
* connection tracking helpers.
*
* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
* - generalize L3 protocol dependent part.
*
* Derived from include/linux/netfiter_ipv4/ip_conntrack_helper.h
*/
#ifndef _NF_CONNTRACK_HELPER_H
#define _NF_CONNTRACK_HELPER_H
#include <net/netfilter/nf_conntrack.h>
struct module;
struct nf_conntrack_helper
{
struct list_head list; /* Internal use. */
const char *name; /* name of the module */
struct module *me; /* pointer to self */
unsigned int max_expected; /* Maximum number of concurrent
* expected connections */
unsigned int timeout; /* timeout for expecteds */
/* Mask of things we will help (compared against server response) */
struct nf_conntrack_tuple tuple;
struct nf_conntrack_tuple mask;
/* Function to call when data passes; return verdict, or -1 to
invalidate. */
int (*help)(struct sk_buff **pskb,
unsigned int protoff,
struct nf_conn *ct,
enum ip_conntrack_info conntrackinfo);
void (*destroy)(struct nf_conn *ct);
int (*to_nfattr)(struct sk_buff *skb, const struct nf_conn *ct);
};
extern struct nf_conntrack_helper *
__nf_ct_helper_find(const struct nf_conntrack_tuple *tuple);
extern struct nf_conntrack_helper *
nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple);
extern struct nf_conntrack_helper *
__nf_conntrack_helper_find_byname(const char *name);
extern void nf_ct_helper_put(struct nf_conntrack_helper *helper);
extern int nf_conntrack_helper_register(struct nf_conntrack_helper *);
extern void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
#endif /*_NF_CONNTRACK_HELPER_H*/