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/* IP connection tracking helpers. */
#ifndef _IP_CONNTRACK_HELPER_H
#define _IP_CONNTRACK_HELPER_H
#include <linux/netfilter_ipv4/ip_conntrack.h>

struct module;

/* Reuse expectation when max_expected reached */
#define IP_CT_HELPER_F_REUSE_EXPECT     0x01

struct ip_conntrack_helper
{      
        struct list_head list;          /* Internal use. */

        const char *name;               /* name of the module */
        unsigned char flags;            /* Flags (see above) */
        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 *skb,
                    struct ip_conntrack *ct,
                    enum ip_conntrack_info conntrackinfo);
};

extern int ip_conntrack_helper_register(struct ip_conntrack_helper *);
extern void ip_conntrack_helper_unregister(struct ip_conntrack_helper *);

extern struct ip_conntrack_helper *ip_ct_find_helper(const struct ip_conntrack_tuple *tuple);

/* Add an expected connection: can have more than one per connection */
extern int ip_conntrack_expect_related(struct ip_conntrack *related_to,
                                       struct ip_conntrack_expect *exp);
extern int ip_conntrack_change_expect(struct ip_conntrack_expect *expect,
                                      struct ip_conntrack_tuple *newtuple);
extern void ip_conntrack_unexpect_related(struct ip_conntrack_expect *exp);

#endif /*_IP_CONNTRACK_HELPER_H*/