1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NF_CONNTRACK_TIMEOUT_H
3 #define _NF_CONNTRACK_TIMEOUT_H
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>
12 #define CTNL_TIMEOUT_NAME_MAX 32
14 struct nf_ct_timeout {
15 __u16 l3num;
16 const struct nf_conntrack_l4proto *l4proto;
17 char data[0];
18 };
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 };
28 struct nf_conn_timeout {
29 struct nf_ct_timeout __rcu *timeout;
30 };
32 static inline unsigned int *
33 nf_ct_timeout_data(const struct nf_conn_timeout *t)
34 {
35 struct nf_ct_timeout *timeout;
37 timeout = rcu_dereference(t->timeout);
38 if (timeout == NULL)
39 return NULL;
41 return (unsigned int *)timeout->data;
42 }
44 static inline
45 struct nf_conn_timeout *nf_ct_timeout_find(const struct nf_conn *ct)
46 {
47 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
48 return nf_ct_ext_find(ct, NF_CT_EXT_TIMEOUT);
49 #else
50 return NULL;
51 #endif
52 }
54 static inline
55 struct nf_conn_timeout *nf_ct_timeout_ext_add(struct nf_conn *ct,
56 struct nf_ct_timeout *timeout,
57 gfp_t gfp)
58 {
59 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
60 struct nf_conn_timeout *timeout_ext;
62 timeout_ext = nf_ct_ext_add(ct, NF_CT_EXT_TIMEOUT, gfp);
63 if (timeout_ext == NULL)
64 return NULL;
66 rcu_assign_pointer(timeout_ext->timeout, timeout);
68 return timeout_ext;
69 #else
70 return NULL;
71 #endif
72 };
74 static inline unsigned int *nf_ct_timeout_lookup(const struct nf_conn *ct)
75 {
76 unsigned int *timeouts = NULL;
77 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
78 struct nf_conn_timeout *timeout_ext;
80 timeout_ext = nf_ct_timeout_find(ct);
81 if (timeout_ext)
82 timeouts = nf_ct_timeout_data(timeout_ext);
83 #endif
84 return timeouts;
85 }
87 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
88 int nf_conntrack_timeout_init(void);
89 void nf_conntrack_timeout_fini(void);
90 void nf_ct_untimeout(struct net *net, struct nf_ct_timeout *timeout);
91 #else
92 static inline int nf_conntrack_timeout_init(void)
93 {
94 return 0;
95 }
97 static inline void nf_conntrack_timeout_fini(void)
98 {
99 return;
100 }
101 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
103 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
104 extern struct nf_ct_timeout *(*nf_ct_timeout_find_get_hook)(struct net *net, const char *name);
105 extern void (*nf_ct_timeout_put_hook)(struct nf_ct_timeout *timeout);
106 #endif
108 #endif /* _NF_CONNTRACK_TIMEOUT_H */