1#ifndef _NF_CONNTRACK_EXTEND_H
2#define _NF_CONNTRACK_EXTEND_H
3
4#include <linux/slab.h>
5
6#include <net/netfilter/nf_conntrack.h>
7
8enum nf_ct_ext_id {
9 NF_CT_EXT_HELPER,
10#if defined(CONFIG_NF_NAT) || defined(CONFIG_NF_NAT_MODULE)
11 NF_CT_EXT_NAT,
12#endif
13 NF_CT_EXT_SEQADJ,
14 NF_CT_EXT_ACCT,
15#ifdef CONFIG_NF_CONNTRACK_EVENTS
16 NF_CT_EXT_ECACHE,
17#endif
18#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
19 NF_CT_EXT_TSTAMP,
20#endif
21#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
22 NF_CT_EXT_TIMEOUT,
23#endif
24#ifdef CONFIG_NF_CONNTRACK_LABELS
25 NF_CT_EXT_LABELS,
26#endif
27#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
28 NF_CT_EXT_SYNPROXY,
29#endif
30 NF_CT_EXT_NUM,
31};
32
33#define NF_CT_EXT_HELPER_TYPE struct nf_conn_help
34#define NF_CT_EXT_NAT_TYPE struct nf_conn_nat
35#define NF_CT_EXT_SEQADJ_TYPE struct nf_conn_seqadj
36#define NF_CT_EXT_ACCT_TYPE struct nf_conn_acct
37#define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache
38#define NF_CT_EXT_TSTAMP_TYPE struct nf_conn_tstamp
39#define NF_CT_EXT_TIMEOUT_TYPE struct nf_conn_timeout
40#define NF_CT_EXT_LABELS_TYPE struct nf_conn_labels
41#define NF_CT_EXT_SYNPROXY_TYPE struct nf_conn_synproxy
42
43
44struct nf_ct_ext {
45 struct rcu_head rcu;
46 u16 offset[NF_CT_EXT_NUM];
47 u16 len;
48 char data[0];
49};
50
51static inline bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id)
52{
53 return !!ext->offset[id];
54}
55
56static inline bool nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
57{
58 return (ct->ext && __nf_ct_ext_exist(ct->ext, id));
59}
60
61static inline void *__nf_ct_ext_find(const struct nf_conn *ct, u8 id)
62{
63 if (!nf_ct_ext_exist(ct, id))
64 return NULL;
65
66 return (void *)ct->ext + ct->ext->offset[id];
67}
68#define nf_ct_ext_find(ext, id) \
69 ((id##_TYPE *)__nf_ct_ext_find((ext), (id)))
70
71
72void __nf_ct_ext_destroy(struct nf_conn *ct);
73static inline void nf_ct_ext_destroy(struct nf_conn *ct)
74{
75 if (ct->ext)
76 __nf_ct_ext_destroy(ct);
77}
78
79
80
81
82static inline void nf_ct_ext_free(struct nf_conn *ct)
83{
84 if (ct->ext)
85 kfree_rcu(ct->ext, rcu);
86}
87
88
89void *__nf_ct_ext_add_length(struct nf_conn *ct, enum nf_ct_ext_id id,
90 size_t var_alloc_len, gfp_t gfp);
91
92#define nf_ct_ext_add(ct, id, gfp) \
93 ((id##_TYPE *)__nf_ct_ext_add_length((ct), (id), 0, (gfp)))
94#define nf_ct_ext_add_length(ct, id, len, gfp) \
95 ((id##_TYPE *)__nf_ct_ext_add_length((ct), (id), (len), (gfp)))
96
97#define NF_CT_EXT_F_PREALLOC 0x0001
98
99struct nf_ct_ext_type {
100
101 void (*destroy)(struct nf_conn *ct);
102
103 enum nf_ct_ext_id id;
104
105 unsigned int flags;
106
107
108 u8 len;
109 u8 align;
110
111 u8 alloc_size;
112};
113
114int nf_ct_extend_register(struct nf_ct_ext_type *type);
115void nf_ct_extend_unregister(struct nf_ct_ext_type *type);
116#endif
117