2 * connection tracking helpers.
4 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
5 * - generalize L3 protocol dependent part.
7 * Derived from include/linux/netfiter_ipv4/ip_conntrack_helper.h
10 #ifndef _NF_CONNTRACK_HELPER_H
11 #define _NF_CONNTRACK_HELPER_H
12 #include <net/netfilter/nf_conntrack.h>
13 #include <net/netfilter/nf_conntrack_extend.h>
14 #include <net/netfilter/nf_conntrack_expect.h>
18 enum nf_ct_helper_flags
{
19 NF_CT_HELPER_F_USERSPACE
= (1 << 0),
20 NF_CT_HELPER_F_CONFIGURED
= (1 << 1),
23 #define NF_CT_HELPER_NAME_LEN 16
25 struct nf_conntrack_helper
{
26 struct hlist_node hnode
; /* Internal use. */
28 char name
[NF_CT_HELPER_NAME_LEN
]; /* name of the module */
29 struct module
*me
; /* pointer to self */
30 const struct nf_conntrack_expect_policy
*expect_policy
;
32 /* length of internal data, ie. sizeof(struct nf_ct_*_master) */
35 /* Tuple of things we will help (compared against server response) */
36 struct nf_conntrack_tuple tuple
;
38 /* Function to call when data passes; return verdict, or -1 to
40 int (*help
)(struct sk_buff
*skb
,
43 enum ip_conntrack_info conntrackinfo
);
45 void (*destroy
)(struct nf_conn
*ct
);
47 int (*from_nlattr
)(struct nlattr
*attr
, struct nf_conn
*ct
);
48 int (*to_nlattr
)(struct sk_buff
*skb
, const struct nf_conn
*ct
);
49 unsigned int expect_class_max
;
52 unsigned int queue_num
; /* For user-space helpers. */
55 struct nf_conntrack_helper
*__nf_conntrack_helper_find(const char *name
,
56 u16 l3num
, u8 protonum
);
58 struct nf_conntrack_helper
*nf_conntrack_helper_try_module_get(const char *name
,
62 int nf_conntrack_helper_register(struct nf_conntrack_helper
*);
63 void nf_conntrack_helper_unregister(struct nf_conntrack_helper
*);
65 struct nf_conn_help
*nf_ct_helper_ext_add(struct nf_conn
*ct
,
66 struct nf_conntrack_helper
*helper
,
69 int __nf_ct_try_assign_helper(struct nf_conn
*ct
, struct nf_conn
*tmpl
,
72 void nf_ct_helper_destroy(struct nf_conn
*ct
);
74 static inline struct nf_conn_help
*nfct_help(const struct nf_conn
*ct
)
76 return nf_ct_ext_find(ct
, NF_CT_EXT_HELPER
);
79 static inline void *nfct_help_data(const struct nf_conn
*ct
)
81 struct nf_conn_help
*help
;
83 help
= nf_ct_ext_find(ct
, NF_CT_EXT_HELPER
);
85 return (void *)help
->data
;
88 int nf_conntrack_helper_pernet_init(struct net
*net
);
89 void nf_conntrack_helper_pernet_fini(struct net
*net
);
91 int nf_conntrack_helper_init(void);
92 void nf_conntrack_helper_fini(void);
94 int nf_conntrack_broadcast_help(struct sk_buff
*skb
, unsigned int protoff
,
96 enum ip_conntrack_info ctinfo
,
97 unsigned int timeout
);
99 struct nf_ct_helper_expectfn
{
100 struct list_head head
;
102 void (*expectfn
)(struct nf_conn
*ct
, struct nf_conntrack_expect
*exp
);
106 void nf_ct_helper_log(struct sk_buff
*skb
, const struct nf_conn
*ct
,
107 const char *fmt
, ...);
109 void nf_ct_helper_expectfn_register(struct nf_ct_helper_expectfn
*n
);
110 void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn
*n
);
111 struct nf_ct_helper_expectfn
*
112 nf_ct_helper_expectfn_find_by_name(const char *name
);
113 struct nf_ct_helper_expectfn
*
114 nf_ct_helper_expectfn_find_by_symbol(const void *symbol
);
116 extern struct hlist_head
*nf_ct_helper_hash
;
117 extern unsigned int nf_ct_helper_hsize
;
119 #endif /*_NF_CONNTRACK_HELPER_H*/