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[0];
18 };
19
20 struct ctnl_timeout {
21 struct list_head head;
22 struct rcu_head rcu_head;
23 refcount_t refcnt;
24 char name[CTNL_TIMEOUT_NAME_MAX];
25 struct nf_ct_timeout timeout;
26 };
27
28 struct nf_conn_timeout {
29 struct nf_ct_timeout __rcu *timeout;
30 };
31
32 static inline unsigned int *
nf_ct_timeout_data(const struct nf_conn_timeout * t)33 nf_ct_timeout_data(const struct nf_conn_timeout *t)
34 {
35 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
36 struct nf_ct_timeout *timeout;
37
38 timeout = rcu_dereference(t->timeout);
39 if (timeout == NULL)
40 return NULL;
41
42 return (unsigned int *)timeout->data;
43 #else
44 return NULL;
45 #endif
46 }
47
48 static inline
nf_ct_timeout_find(const struct nf_conn * ct)49 struct nf_conn_timeout *nf_ct_timeout_find(const struct nf_conn *ct)
50 {
51 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
52 return nf_ct_ext_find(ct, NF_CT_EXT_TIMEOUT);
53 #else
54 return NULL;
55 #endif
56 }
57
58 static inline
nf_ct_timeout_ext_add(struct nf_conn * ct,struct nf_ct_timeout * timeout,gfp_t gfp)59 struct nf_conn_timeout *nf_ct_timeout_ext_add(struct nf_conn *ct,
60 struct nf_ct_timeout *timeout,
61 gfp_t gfp)
62 {
63 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
64 struct nf_conn_timeout *timeout_ext;
65
66 timeout_ext = nf_ct_ext_add(ct, NF_CT_EXT_TIMEOUT, gfp);
67 if (timeout_ext == NULL)
68 return NULL;
69
70 rcu_assign_pointer(timeout_ext->timeout, timeout);
71
72 return timeout_ext;
73 #else
74 return NULL;
75 #endif
76 };
77
nf_ct_timeout_lookup(const struct nf_conn * ct)78 static inline unsigned int *nf_ct_timeout_lookup(const struct nf_conn *ct)
79 {
80 unsigned int *timeouts = NULL;
81 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
82 struct nf_conn_timeout *timeout_ext;
83
84 timeout_ext = nf_ct_timeout_find(ct);
85 if (timeout_ext)
86 timeouts = nf_ct_timeout_data(timeout_ext);
87 #endif
88 return timeouts;
89 }
90
91 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
92 int nf_conntrack_timeout_init(void);
93 void nf_conntrack_timeout_fini(void);
94 void nf_ct_untimeout(struct net *net, struct nf_ct_timeout *timeout);
95 int nf_ct_set_timeout(struct net *net, struct nf_conn *ct, u8 l3num, u8 l4num,
96 const char *timeout_name);
97 void nf_ct_destroy_timeout(struct nf_conn *ct);
98 #else
nf_conntrack_timeout_init(void)99 static inline int nf_conntrack_timeout_init(void)
100 {
101 return 0;
102 }
103
nf_conntrack_timeout_fini(void)104 static inline void nf_conntrack_timeout_fini(void)
105 {
106 return;
107 }
108
nf_ct_set_timeout(struct net * net,struct nf_conn * ct,u8 l3num,u8 l4num,const char * timeout_name)109 static inline int nf_ct_set_timeout(struct net *net, struct nf_conn *ct,
110 u8 l3num, u8 l4num,
111 const char *timeout_name)
112 {
113 return -EOPNOTSUPP;
114 }
115
nf_ct_destroy_timeout(struct nf_conn * ct)116 static inline void nf_ct_destroy_timeout(struct nf_conn *ct)
117 {
118 return;
119 }
120 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
121
122 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
123 extern struct nf_ct_timeout *(*nf_ct_timeout_find_get_hook)(struct net *net, const char *name);
124 extern void (*nf_ct_timeout_put_hook)(struct nf_ct_timeout *timeout);
125 #endif
126
127 #endif /* _NF_CONNTRACK_TIMEOUT_H */
128
