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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>
15
16struct module;
17
18enum nf_ct_helper_flags {
19 NF_CT_HELPER_F_USERSPACE = (1 << 0),
20 NF_CT_HELPER_F_CONFIGURED = (1 << 1),
21};
22
23#define NF_CT_HELPER_NAME_LEN 16
24
25struct nf_conntrack_helper {
26 struct hlist_node hnode;
27
28 char name[NF_CT_HELPER_NAME_LEN];
29 struct module *me;
30 const struct nf_conntrack_expect_policy *expect_policy;
31
32
33 size_t data_len;
34
35
36 struct nf_conntrack_tuple tuple;
37
38
39
40 int (*help)(struct sk_buff *skb,
41 unsigned int protoff,
42 struct nf_conn *ct,
43 enum ip_conntrack_info conntrackinfo);
44
45 void (*destroy)(struct nf_conn *ct);
46
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;
50
51 unsigned int flags;
52 unsigned int queue_num;
53};
54
55struct nf_conntrack_helper *__nf_conntrack_helper_find(const char *name,
56 u16 l3num, u8 protonum);
57
58struct nf_conntrack_helper *nf_conntrack_helper_try_module_get(const char *name,
59 u16 l3num,
60 u8 protonum);
61
62int nf_conntrack_helper_register(struct nf_conntrack_helper *);
63void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
64
65struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct,
66 struct nf_conntrack_helper *helper,
67 gfp_t gfp);
68
69int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
70 gfp_t flags);
71
72void nf_ct_helper_destroy(struct nf_conn *ct);
73
74static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
75{
76 return nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
77}
78
79static inline void *nfct_help_data(const struct nf_conn *ct)
80{
81 struct nf_conn_help *help;
82
83 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
84
85 return (void *)help->data;
86}
87
88int nf_conntrack_helper_pernet_init(struct net *net);
89void nf_conntrack_helper_pernet_fini(struct net *net);
90
91int nf_conntrack_helper_init(void);
92void nf_conntrack_helper_fini(void);
93
94int nf_conntrack_broadcast_help(struct sk_buff *skb, unsigned int protoff,
95 struct nf_conn *ct,
96 enum ip_conntrack_info ctinfo,
97 unsigned int timeout);
98
99struct nf_ct_helper_expectfn {
100 struct list_head head;
101 const char *name;
102 void (*expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
103};
104
105__printf(3,4)
106void nf_ct_helper_log(struct sk_buff *skb, const struct nf_conn *ct,
107 const char *fmt, ...);
108
109void nf_ct_helper_expectfn_register(struct nf_ct_helper_expectfn *n);
110void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn *n);
111struct nf_ct_helper_expectfn *
112nf_ct_helper_expectfn_find_by_name(const char *name);
113struct nf_ct_helper_expectfn *
114nf_ct_helper_expectfn_find_by_symbol(const void *symbol);
115
116extern struct hlist_head *nf_ct_helper_hash;
117extern unsigned int nf_ct_helper_hsize;
118
119#endif
120