blob: 6cf614bc0029326da74bdb6145d009f95f3422e5 [file] [log] [blame]
* connection tracking helpers.
* 16 Dec 2003: Yasuyuki Kozakai @USAGI <>
* - generalize L3 protocol dependent part.
* Derived from include/linux/netfiter_ipv4/ip_conntrack_helper.h
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_conntrack_expect.h>
struct module;
enum nf_ct_helper_flags {
struct nf_conntrack_helper {
struct hlist_node hnode; /* Internal use. */
char name[NF_CT_HELPER_NAME_LEN]; /* name of the module */
struct module *me; /* pointer to self */
const struct nf_conntrack_expect_policy *expect_policy;
/* length of internal data, ie. sizeof(struct nf_ct_*_master) */
size_t data_len;
/* 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 (*from_nlattr)(struct nlattr *attr, struct nf_conn *ct);
int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct);
unsigned int expect_class_max;
unsigned int flags;
unsigned int queue_num; /* For user-space helpers. */
struct nf_conntrack_helper *__nf_conntrack_helper_find(const char *name,
u16 l3num, u8 protonum);
struct nf_conntrack_helper *nf_conntrack_helper_try_module_get(const char *name,
u16 l3num,
u8 protonum);
int nf_conntrack_helper_register(struct nf_conntrack_helper *);
void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct,
struct nf_conntrack_helper *helper,
gfp_t gfp);
int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
gfp_t flags);
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);
static inline void *nfct_help_data(const struct nf_conn *ct)
struct nf_conn_help *help;
help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
return (void *)help->data;
int nf_conntrack_helper_pernet_init(struct net *net);
void nf_conntrack_helper_pernet_fini(struct net *net);
int nf_conntrack_helper_init(void);
void nf_conntrack_helper_fini(void);
int nf_conntrack_broadcast_help(struct sk_buff *skb, unsigned int protoff,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned int timeout);
struct nf_ct_helper_expectfn {
struct list_head head;
const char *name;
void (*expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
void nf_ct_helper_log(struct sk_buff *skb, const struct nf_conn *ct,
const char *fmt, ...);
void nf_ct_helper_expectfn_register(struct nf_ct_helper_expectfn *n);
void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn *n);
struct nf_ct_helper_expectfn *
nf_ct_helper_expectfn_find_by_name(const char *name);
struct nf_ct_helper_expectfn *
nf_ct_helper_expectfn_find_by_symbol(const void *symbol);
extern struct hlist_head *nf_ct_helper_hash;
extern unsigned int nf_ct_helper_hsize;