/* IP connection tracking helpers. */
#ifndef _IP_CONNTRACK_HELPER_H
#define _IP_CONNTRACK_HELPER_H
#include <linux/netfilter_ipv4/ip_conntrack.h>
struct module;
struct ip_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 ip_conntrack_tuple tuple;
struct ip_conntrack_tuple mask;
/* Function to call when data passes; return verdict, or -1 to
invalidate. */
int (*help)(struct sk_buff **pskb,
struct ip_conntrack *ct,
enum ip_conntrack_info conntrackinfo);
int (*to_nfattr)(struct sk_buff *skb, const struct ip_conntrack *ct);
};
extern int ip_conntrack_helper_register(struct ip_conntrack_helper *);
extern void ip_conntrack_helper_unregister(struct ip_conntrack_helper *);
/* Allocate space for an expectation: this is mandatory before calling
ip_conntrack_expect_related. You will have to call put afterwards. */
extern struct ip_conntrack_expect *
ip_conntrack_expect_alloc(struct ip_conntrack *master);
extern void ip_conntrack_expect_put(struct ip_conntrack_expect *exp);
/* Add an expected connection: can have more than one per connection */
extern int ip_conntrack_expect_related(struct ip_conntrack_expect *exp);
extern void ip_conntrack_unexpect_related(struct ip_conntrack_expect *exp);
#endif /*_IP_CONNTRACK_HELPER_H*/