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 ctnl_timeout {
15 	struct list_head	head;
16 	struct rcu_head		rcu_head;
17 	refcount_t		refcnt;
18 	char			name[CTNL_TIMEOUT_NAME_MAX];
19 	__u16			l3num;
20 	const struct nf_conntrack_l4proto *l4proto;
21 	char			data[0];
22 };
23 
24 struct nf_conn_timeout {
25 	struct ctnl_timeout __rcu *timeout;
26 };
27 
28 static inline unsigned int *
29 nf_ct_timeout_data(struct nf_conn_timeout *t)
30 {
31 	struct ctnl_timeout *timeout;
32 
33 	timeout = rcu_dereference(t->timeout);
34 	if (timeout == NULL)
35 		return NULL;
36 
37 	return (unsigned int *)timeout->data;
38 }
39 
40 static inline
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
51 struct nf_conn_timeout *nf_ct_timeout_ext_add(struct nf_conn *ct,
52 					      struct ctnl_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 
70 static inline unsigned int *
71 nf_ct_timeout_lookup(struct net *net, struct nf_conn *ct,
72 		     const struct nf_conntrack_l4proto *l4proto)
73 {
74 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
75 	struct nf_conn_timeout *timeout_ext;
76 	unsigned int *timeouts;
77 
78 	timeout_ext = nf_ct_timeout_find(ct);
79 	if (timeout_ext) {
80 		timeouts = nf_ct_timeout_data(timeout_ext);
81 		if (unlikely(!timeouts))
82 			timeouts = l4proto->get_timeouts(net);
83 	} else {
84 		timeouts = l4proto->get_timeouts(net);
85 	}
86 
87 	return timeouts;
88 #else
89 	return l4proto->get_timeouts(net);
90 #endif
91 }
92 
93 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
94 int nf_conntrack_timeout_init(void);
95 void nf_conntrack_timeout_fini(void);
96 #else
97 static inline int nf_conntrack_timeout_init(void)
98 {
99         return 0;
100 }
101 
102 static inline void nf_conntrack_timeout_fini(void)
103 {
104         return;
105 }
106 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
107 
108 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
109 extern struct ctnl_timeout *(*nf_ct_timeout_find_get_hook)(struct net *net, const char *name);
110 extern void (*nf_ct_timeout_put_hook)(struct ctnl_timeout *timeout);
111 #endif
112 
113 #endif /* _NF_CONNTRACK_TIMEOUT_H */
114