1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NF_CONNTRACK_TIMEOUT_H
3 #define _NF_CONNTRACK_TIMEOUT_H
4
5 #include <net/net_namespace.h>
6 #include <linux/netfilter/nf_conntrack_common.h>
7 #include <linux/netfilter/nf_conntrack_tuple_common.h>
8 #include <linux/refcount.h>
9 #include <net/netfilter/nf_conntrack.h>
10 #include <net/netfilter/nf_conntrack_extend.h>
11
12 #define CTNL_TIMEOUT_NAME_MAX 32
13
14 struct nf_ct_timeout {
15 __u16 l3num;
16 const struct nf_conntrack_l4proto *l4proto;
17 char data[];
18 };
19
20 struct nf_conn_timeout {
21 struct nf_ct_timeout __rcu *timeout;
22 };
23
24 static inline unsigned int *
nf_ct_timeout_data(const struct nf_conn_timeout * t)25 nf_ct_timeout_data(const struct nf_conn_timeout *t)
26 {
27 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
28 struct nf_ct_timeout *timeout;
29
30 timeout = rcu_dereference(t->timeout);
31 if (timeout == NULL)
32 return NULL;
33
34 return (unsigned int *)timeout->data;
35 #else
36 return NULL;
37 #endif
38 }
39
40 static inline
nf_ct_timeout_find(const struct nf_conn * ct)41 struct nf_conn_timeout *nf_ct_timeout_find(const struct nf_conn *ct)
42 {
43 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
44 return nf_ct_ext_find(ct, NF_CT_EXT_TIMEOUT);
45 #else
46 return NULL;
47 #endif
48 }
49
50 static inline
nf_ct_timeout_ext_add(struct nf_conn * ct,struct nf_ct_timeout * timeout,gfp_t gfp)51 struct nf_conn_timeout *nf_ct_timeout_ext_add(struct nf_conn *ct,
52 struct nf_ct_timeout *timeout,
53 gfp_t gfp)
54 {
55 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
56 struct nf_conn_timeout *timeout_ext;
57
58 timeout_ext = nf_ct_ext_add(ct, NF_CT_EXT_TIMEOUT, gfp);
59 if (timeout_ext == NULL)
60 return NULL;
61
62 rcu_assign_pointer(timeout_ext->timeout, timeout);
63
64 return timeout_ext;
65 #else
66 return NULL;
67 #endif
68 };
69
nf_ct_timeout_lookup(const struct nf_conn * ct)70 static inline unsigned int *nf_ct_timeout_lookup(const struct nf_conn *ct)
71 {
72 unsigned int *timeouts = NULL;
73 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
74 struct nf_conn_timeout *timeout_ext;
75
76 timeout_ext = nf_ct_timeout_find(ct);
77 if (timeout_ext)
78 timeouts = nf_ct_timeout_data(timeout_ext);
79 #endif
80 return timeouts;
81 }
82
83 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
84 void nf_ct_untimeout(struct net *net, struct nf_ct_timeout *timeout);
85 int nf_ct_set_timeout(struct net *net, struct nf_conn *ct, u8 l3num, u8 l4num,
86 const char *timeout_name);
87 void nf_ct_destroy_timeout(struct nf_conn *ct);
88 #else
nf_ct_set_timeout(struct net * net,struct nf_conn * ct,u8 l3num,u8 l4num,const char * timeout_name)89 static inline int nf_ct_set_timeout(struct net *net, struct nf_conn *ct,
90 u8 l3num, u8 l4num,
91 const char *timeout_name)
92 {
93 return -EOPNOTSUPP;
94 }
95
nf_ct_destroy_timeout(struct nf_conn * ct)96 static inline void nf_ct_destroy_timeout(struct nf_conn *ct)
97 {
98 return;
99 }
100 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
101
102 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
103 struct nf_ct_timeout_hooks {
104 struct nf_ct_timeout *(*timeout_find_get)(struct net *net, const char *name);
105 void (*timeout_put)(struct nf_ct_timeout *timeout);
106 };
107
108 extern const struct nf_ct_timeout_hooks *nf_ct_timeout_hook;
109 #endif
110
111 #endif /* _NF_CONNTRACK_TIMEOUT_H */
112