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
9enum 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. */
38struct 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
45static inline bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id)
46{
47 return !!ext->offset[id];
48}
49
50static inline bool nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
51{
52 return (ct->ext && __nf_ct_ext_exist(ext: ct->ext, id));
53}
54
55void *__nf_ct_ext_find(const struct nf_ct_ext *ext, u8 id);
56
57static 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. */
71void *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 */
76extern atomic_t nf_conntrack_ext_genid;
77void nf_ct_ext_bump_genid(void);
78
79#endif /* _NF_CONNTRACK_EXTEND_H */
80

source code of linux/include/net/netfilter/nf_conntrack_extend.h