1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NF_CONNTRACK_EXTEND_H
3 #define _NF_CONNTRACK_EXTEND_H
4
5 #include <linux/slab.h>
6
7 #include <net/netfilter/nf_conntrack.h>
8
9 enum nf_ct_ext_id {
10 NF_CT_EXT_HELPER,
11 #if IS_ENABLED(CONFIG_NF_NAT)
12 NF_CT_EXT_NAT,
13 #endif
14 NF_CT_EXT_SEQADJ,
15 NF_CT_EXT_ACCT,
16 #ifdef CONFIG_NF_CONNTRACK_EVENTS
17 NF_CT_EXT_ECACHE,
18 #endif
19 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
20 NF_CT_EXT_TSTAMP,
21 #endif
22 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
23 NF_CT_EXT_TIMEOUT,
24 #endif
25 #ifdef CONFIG_NF_CONNTRACK_LABELS
26 NF_CT_EXT_LABELS,
27 #endif
28 #if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
29 NF_CT_EXT_SYNPROXY,
30 #endif
31 #if IS_ENABLED(CONFIG_NET_ACT_CT)
32 NF_CT_EXT_ACT_CT,
33 #endif
34 NF_CT_EXT_NUM,
35 };
36
37 /* Extensions: optional stuff which isn't permanently in struct. */
38 struct nf_ct_ext {
39 u8 offset[NF_CT_EXT_NUM];
40 u8 len;
41 unsigned int gen_id;
42 char data[] __aligned(8);
43 };
44
__nf_ct_ext_exist(const struct nf_ct_ext * ext,u8 id)45 static inline bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id)
46 {
47 return !!ext->offset[id];
48 }
49
nf_ct_ext_exist(const struct nf_conn * ct,u8 id)50 static inline bool nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
51 {
52 return (ct->ext && __nf_ct_ext_exist(ct->ext, id));
53 }
54
55 void *__nf_ct_ext_find(const struct nf_ct_ext *ext, u8 id);
56
nf_ct_ext_find(const struct nf_conn * ct,u8 id)57 static inline void *nf_ct_ext_find(const struct nf_conn *ct, u8 id)
58 {
59 struct nf_ct_ext *ext = ct->ext;
60
61 if (!ext || !__nf_ct_ext_exist(ext, id))
62 return NULL;
63
64 if (unlikely(ext->gen_id))
65 return __nf_ct_ext_find(ext, id);
66
67 return (void *)ct->ext + ct->ext->offset[id];
68 }
69
70 /* Add this type, returns pointer to data or NULL. */
71 void *nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp);
72
73 /* ext genid. if ext->id != ext_genid, extensions cannot be used
74 * anymore unless conntrack has CONFIRMED bit set.
75 */
76 extern atomic_t nf_conntrack_ext_genid;
77 void nf_ct_ext_bump_genid(void);
78
79 #endif /* _NF_CONNTRACK_EXTEND_H */
80