1 #ifndef _NF_CONNTRACK_EXTEND_H
2 #define _NF_CONNTRACK_EXTEND_H
3
4 #include <net/netfilter/nf_conntrack.h>
5
6 enum nf_ct_ext_id
7 {
8 NF_CT_EXT_HELPER,
9 NF_CT_EXT_NAT,
10 NF_CT_EXT_ACCT,
11 NF_CT_EXT_ECACHE,
12 NF_CT_EXT_NUM,
13 };
14
15 #define NF_CT_EXT_HELPER_TYPE struct nf_conn_help
16 #define NF_CT_EXT_NAT_TYPE struct nf_conn_nat
17 #define NF_CT_EXT_ACCT_TYPE struct nf_conn_counter
18 #define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache
19
20 /* Extensions: optional stuff which isn't permanently in struct. */
21 struct nf_ct_ext {
22 struct rcu_head rcu;
23 u8 offset[NF_CT_EXT_NUM];
24 u8 len;
25 char data[0];
26 };
27
28 static inline int nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
29 {
30 return (ct->ext && ct->ext->offset[id]);
31 }
32
33 static inline void *__nf_ct_ext_find(const struct nf_conn *ct, u8 id)
34 {
35 if (!nf_ct_ext_exist(ct, id))
36 return NULL;
37
38 return (void *)ct->ext + ct->ext->offset[id];
39 }
40 #define nf_ct_ext_find(ext, id) \
41 ((id##_TYPE *)__nf_ct_ext_find((ext), (id)))
42
43 /* Destroy all relationships */
44 extern void __nf_ct_ext_destroy(struct nf_conn *ct);
45 static inline void nf_ct_ext_destroy(struct nf_conn *ct)
46 {
47 if (ct->ext)
48 __nf_ct_ext_destroy(ct);
49 }
50
51 /* Free operation. If you want to free a object referred from private area,
52 * please implement __nf_ct_ext_free() and call it.
53 */
54 static inline void nf_ct_ext_free(struct nf_conn *ct)
55 {
56 if (ct->ext)
57 kfree(ct->ext);
58 }
59
60 /* Add this type, returns pointer to data or NULL. */
61 void *
62 __nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp);
63 #define nf_ct_ext_add(ct, id, gfp) \
64 ((id##_TYPE *)__nf_ct_ext_add((ct), (id), (gfp)))
65
66 #define NF_CT_EXT_F_PREALLOC 0x0001
67
68 struct nf_ct_ext_type
69 {
70 /* Destroys relationships (can be NULL). */
71 void (*destroy)(struct nf_conn *ct);
72 /* Called when realloacted (can be NULL).
73 Contents has already been moved. */
74 void (*move)(void *new, void *old);
75
76 enum nf_ct_ext_id id;
77
78 unsigned int flags;
79
80 /* Length and min alignment. */
81 u8 len;
82 u8 align;
83 /* initial size of nf_ct_ext. */
84 u8 alloc_size;
85 };
86
87 int nf_ct_extend_register(struct nf_ct_ext_type *type);
88 void nf_ct_extend_unregister(struct nf_ct_ext_type *type);
89 #endif /* _NF_CONNTRACK_EXTEND_H */
90
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