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/*
* 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>
#include <net/netfilter/nf_conntrack_extend.h>
struct module;
#define NF_CT_HELPER_NAME_LEN 16
struct nf_conntrack_helper {
struct hlist_node hnode; /* Internal use. */
const char *name; /* name of the module */
struct module *me; /* pointer to self */
const struct nf_conntrack_expect_policy *expect_policy;
/* Tuple of things we will help (compared against server response) */
struct nf_conntrack_tuple tuple;
/* Function to call when data passes; return verdict, or -1 to
invalidate. */
int (*help)(struct sk_buff *skb,
unsigned int protoff,
struct nf_conn *ct,
enum ip_conntrack_info conntrackinfo);
void (*destroy)(struct nf_conn *ct);
int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct);
unsigned int expect_class_max;
};
extern struct nf_conntrack_helper *
__nf_conntrack_helper_find(const char *name, u16 l3num, u8 protonum);
extern struct nf_conntrack_helper *
nf_conntrack_helper_try_module_get(const char *name, u16 l3num, u8 protonum);
extern int nf_conntrack_helper_register(struct nf_conntrack_helper *);
extern void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
extern struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp);
extern int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
gfp_t flags);
extern void nf_ct_helper_destroy(struct nf_conn *ct);
static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
{
return nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
}
extern int nf_conntrack_helper_init(void);
extern void nf_conntrack_helper_fini(void);
extern int nf_conntrack_broadcast_help(struct sk_buff *skb,
unsigned int protoff,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned int timeout);
#endif /*_NF_CONNTRACK_HELPER_H*/
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