Commit | Line | Data |
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ecfab2c9 YK |
1 | #ifndef _NF_CONNTRACK_EXTEND_H |
2 | #define _NF_CONNTRACK_EXTEND_H | |
3 | ||
5a0e3ad6 TH |
4 | #include <linux/slab.h> |
5 | ||
ecfab2c9 YK |
6 | #include <net/netfilter/nf_conntrack.h> |
7 | ||
fd2c3ef7 | 8 | enum nf_ct_ext_id { |
ceceae1b | 9 | NF_CT_EXT_HELPER, |
e0e76c83 | 10 | #if defined(CONFIG_NF_NAT) || defined(CONFIG_NF_NAT_MODULE) |
2d59e5ca | 11 | NF_CT_EXT_NAT, |
e0e76c83 | 12 | #endif |
48b1de4c | 13 | NF_CT_EXT_SEQADJ, |
58401572 | 14 | NF_CT_EXT_ACCT, |
e0e76c83 | 15 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
a0891aa6 | 16 | NF_CT_EXT_ECACHE, |
e0e76c83 | 17 | #endif |
a992ca2a PNA |
18 | #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP |
19 | NF_CT_EXT_TSTAMP, | |
dd705072 PNA |
20 | #endif |
21 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT | |
22 | NF_CT_EXT_TIMEOUT, | |
c539f017 FW |
23 | #endif |
24 | #ifdef CONFIG_NF_CONNTRACK_LABELS | |
25 | NF_CT_EXT_LABELS, | |
48b1de4c PM |
26 | #endif |
27 | #if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY) | |
28 | NF_CT_EXT_SYNPROXY, | |
e0e76c83 | 29 | #endif |
ecfab2c9 YK |
30 | NF_CT_EXT_NUM, |
31 | }; | |
32 | ||
ceceae1b | 33 | #define NF_CT_EXT_HELPER_TYPE struct nf_conn_help |
2d59e5ca | 34 | #define NF_CT_EXT_NAT_TYPE struct nf_conn_nat |
41d73ec0 | 35 | #define NF_CT_EXT_SEQADJ_TYPE struct nf_conn_seqadj |
f7b13e43 | 36 | #define NF_CT_EXT_ACCT_TYPE struct nf_conn_acct |
a0891aa6 | 37 | #define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache |
a992ca2a | 38 | #define NF_CT_EXT_TSTAMP_TYPE struct nf_conn_tstamp |
dd705072 | 39 | #define NF_CT_EXT_TIMEOUT_TYPE struct nf_conn_timeout |
c539f017 | 40 | #define NF_CT_EXT_LABELS_TYPE struct nf_conn_labels |
48b1de4c | 41 | #define NF_CT_EXT_SYNPROXY_TYPE struct nf_conn_synproxy |
ceceae1b | 42 | |
ecfab2c9 YK |
43 | /* Extensions: optional stuff which isn't permanently in struct. */ |
44 | struct nf_ct_ext { | |
68b80f11 | 45 | struct rcu_head rcu; |
223b02d9 AV |
46 | u16 offset[NF_CT_EXT_NUM]; |
47 | u16 len; | |
ecfab2c9 YK |
48 | char data[0]; |
49 | }; | |
50 | ||
ee92d378 | 51 | static inline bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id) |
ecfab2c9 | 52 | { |
ee92d378 CG |
53 | return !!ext->offset[id]; |
54 | } | |
55 | ||
56 | static 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)); | |
ecfab2c9 YK |
59 | } |
60 | ||
61 | static 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 | /* Destroy all relationships */ | |
4e77be46 | 72 | void __nf_ct_ext_destroy(struct nf_conn *ct); |
ecfab2c9 YK |
73 | static inline void nf_ct_ext_destroy(struct nf_conn *ct) |
74 | { | |
75 | if (ct->ext) | |
76 | __nf_ct_ext_destroy(ct); | |
77 | } | |
78 | ||
79 | /* Free operation. If you want to free a object referred from private area, | |
80 | * please implement __nf_ct_ext_free() and call it. | |
81 | */ | |
82 | static inline void nf_ct_ext_free(struct nf_conn *ct) | |
83 | { | |
84 | if (ct->ext) | |
c13a84a8 | 85 | kfree_rcu(ct->ext, rcu); |
ecfab2c9 YK |
86 | } |
87 | ||
88 | /* Add this type, returns pointer to data or NULL. */ | |
3cf4c7e3 PNA |
89 | void *__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 | ||
ecfab2c9 | 92 | #define nf_ct_ext_add(ct, id, gfp) \ |
3cf4c7e3 PNA |
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))) | |
ecfab2c9 YK |
96 | |
97 | #define NF_CT_EXT_F_PREALLOC 0x0001 | |
98 | ||
fd2c3ef7 | 99 | struct nf_ct_ext_type { |
ecfab2c9 YK |
100 | /* Destroys relationships (can be NULL). */ |
101 | void (*destroy)(struct nf_conn *ct); | |
ecfab2c9 YK |
102 | |
103 | enum nf_ct_ext_id id; | |
104 | ||
105 | unsigned int flags; | |
106 | ||
107 | /* Length and min alignment. */ | |
108 | u8 len; | |
109 | u8 align; | |
110 | /* initial size of nf_ct_ext. */ | |
111 | u8 alloc_size; | |
112 | }; | |
113 | ||
114 | int nf_ct_extend_register(struct nf_ct_ext_type *type); | |
115 | void nf_ct_extend_unregister(struct nf_ct_ext_type *type); | |
116 | #endif /* _NF_CONNTRACK_EXTEND_H */ |