Commit | Line | Data |
---|---|---|
9fb9cbb1 YK |
1 | /* |
2 | * connection tracking helpers. | |
3 | * | |
4 | * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> | |
5 | * - generalize L3 protocol dependent part. | |
6 | * | |
7 | * Derived from include/linux/netfiter_ipv4/ip_conntrack_helper.h | |
8 | */ | |
9 | ||
10 | #ifndef _NF_CONNTRACK_HELPER_H | |
11 | #define _NF_CONNTRACK_HELPER_H | |
12 | #include <net/netfilter/nf_conntrack.h> | |
ceceae1b | 13 | #include <net/netfilter/nf_conntrack_extend.h> |
1afc5679 | 14 | #include <net/netfilter/nf_conntrack_expect.h> |
9fb9cbb1 YK |
15 | |
16 | struct module; | |
17 | ||
12f7a505 PNA |
18 | enum nf_ct_helper_flags { |
19 | NF_CT_HELPER_F_USERSPACE = (1 << 0), | |
20 | NF_CT_HELPER_F_CONFIGURED = (1 << 1), | |
21 | }; | |
22 | ||
af9d32ad HE |
23 | #define NF_CT_HELPER_NAME_LEN 16 |
24 | ||
fd2c3ef7 | 25 | struct nf_conntrack_helper { |
b8a7fe6c | 26 | struct hlist_node hnode; /* Internal use. */ |
9fb9cbb1 | 27 | |
3a8fc53a | 28 | char name[NF_CT_HELPER_NAME_LEN]; /* name of the module */ |
9fb9cbb1 | 29 | struct module *me; /* pointer to self */ |
6002f266 | 30 | const struct nf_conntrack_expect_policy *expect_policy; |
9fb9cbb1 | 31 | |
1afc5679 PNA |
32 | /* length of internal data, ie. sizeof(struct nf_ct_*_master) */ |
33 | size_t data_len; | |
34 | ||
d4156e8c | 35 | /* Tuple of things we will help (compared against server response) */ |
9fb9cbb1 | 36 | struct nf_conntrack_tuple tuple; |
d4156e8c | 37 | |
9fb9cbb1 YK |
38 | /* Function to call when data passes; return verdict, or -1 to |
39 | invalidate. */ | |
3db05fea | 40 | int (*help)(struct sk_buff *skb, |
9fb9cbb1 YK |
41 | unsigned int protoff, |
42 | struct nf_conn *ct, | |
43 | enum ip_conntrack_info conntrackinfo); | |
c1d10adb | 44 | |
f09943fe PM |
45 | void (*destroy)(struct nf_conn *ct); |
46 | ||
ae243bee | 47 | int (*from_nlattr)(struct nlattr *attr, struct nf_conn *ct); |
fdf70832 | 48 | int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct); |
6002f266 | 49 | unsigned int expect_class_max; |
12f7a505 PNA |
50 | |
51 | unsigned int flags; | |
52 | unsigned int queue_num; /* For user-space helpers. */ | |
9fb9cbb1 YK |
53 | }; |
54 | ||
7e5d03bb | 55 | extern struct nf_conntrack_helper * |
794e6871 | 56 | __nf_conntrack_helper_find(const char *name, u16 l3num, u8 protonum); |
7e5d03bb | 57 | |
84f3bb9a PM |
58 | extern struct nf_conntrack_helper * |
59 | nf_conntrack_helper_try_module_get(const char *name, u16 l3num, u8 protonum); | |
60 | ||
9fb9cbb1 YK |
61 | extern int nf_conntrack_helper_register(struct nf_conntrack_helper *); |
62 | extern void nf_conntrack_helper_unregister(struct nf_conntrack_helper *); | |
63 | ||
1afc5679 | 64 | extern struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, struct nf_conntrack_helper *helper, gfp_t gfp); |
b560580a | 65 | |
b2a15a60 PM |
66 | extern int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl, |
67 | gfp_t flags); | |
226c0c0e | 68 | |
9858a3ae PNA |
69 | extern void nf_ct_helper_destroy(struct nf_conn *ct); |
70 | ||
ceceae1b YK |
71 | static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct) |
72 | { | |
73 | return nf_ct_ext_find(ct, NF_CT_EXT_HELPER); | |
74 | } | |
b334aadc | 75 | |
1afc5679 PNA |
76 | static inline void *nfct_help_data(const struct nf_conn *ct) |
77 | { | |
78 | struct nf_conn_help *help; | |
79 | ||
80 | help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER); | |
81 | ||
82 | return (void *)help->data; | |
83 | } | |
84 | ||
5e615b22 G |
85 | extern int nf_conntrack_helper_pernet_init(struct net *net); |
86 | extern void nf_conntrack_helper_pernet_fini(struct net *net); | |
87 | ||
88 | extern int nf_conntrack_helper_init(void); | |
89 | extern void nf_conntrack_helper_fini(void); | |
b334aadc | 90 | |
93557f53 JO |
91 | extern int nf_conntrack_broadcast_help(struct sk_buff *skb, |
92 | unsigned int protoff, | |
93 | struct nf_conn *ct, | |
94 | enum ip_conntrack_info ctinfo, | |
95 | unsigned int timeout); | |
96 | ||
544d5c7d PNA |
97 | struct nf_ct_helper_expectfn { |
98 | struct list_head head; | |
99 | const char *name; | |
100 | void (*expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp); | |
101 | }; | |
102 | ||
103 | void nf_ct_helper_expectfn_register(struct nf_ct_helper_expectfn *n); | |
104 | void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn *n); | |
105 | struct nf_ct_helper_expectfn * | |
106 | nf_ct_helper_expectfn_find_by_name(const char *name); | |
107 | struct nf_ct_helper_expectfn * | |
108 | nf_ct_helper_expectfn_find_by_symbol(const void *symbol); | |
109 | ||
12f7a505 PNA |
110 | extern struct hlist_head *nf_ct_helper_hash; |
111 | extern unsigned int nf_ct_helper_hsize; | |
112 | ||
9fb9cbb1 | 113 | #endif /*_NF_CONNTRACK_HELPER_H*/ |