Merge remote-tracking branches 'spi/topic/devprop', 'spi/topic/fsl', 'spi/topic/fsl...
[sfrench/cifs-2.6.git] / include / net / netfilter / nf_conntrack_timeout.h
1 #ifndef _NF_CONNTRACK_TIMEOUT_H
2 #define _NF_CONNTRACK_TIMEOUT_H
3
4 #include <net/net_namespace.h>
5 #include <linux/netfilter/nf_conntrack_common.h>
6 #include <linux/netfilter/nf_conntrack_tuple_common.h>
7 #include <net/netfilter/nf_conntrack.h>
8 #include <net/netfilter/nf_conntrack_extend.h>
9
10 #define CTNL_TIMEOUT_NAME_MAX   32
11
12 struct ctnl_timeout {
13         struct list_head        head;
14         struct rcu_head         rcu_head;
15         atomic_t                refcnt;
16         char                    name[CTNL_TIMEOUT_NAME_MAX];
17         __u16                   l3num;
18         struct nf_conntrack_l4proto *l4proto;
19         char                    data[0];
20 };
21
22 struct nf_conn_timeout {
23         struct ctnl_timeout __rcu *timeout;
24 };
25
26 static inline unsigned int *
27 nf_ct_timeout_data(struct nf_conn_timeout *t)
28 {
29         struct ctnl_timeout *timeout;
30
31         timeout = rcu_dereference(t->timeout);
32         if (timeout == NULL)
33                 return NULL;
34
35         return (unsigned int *)timeout->data;
36 }
37
38 static inline
39 struct nf_conn_timeout *nf_ct_timeout_find(const struct nf_conn *ct)
40 {
41 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
42         return nf_ct_ext_find(ct, NF_CT_EXT_TIMEOUT);
43 #else
44         return NULL;
45 #endif
46 }
47
48 static inline
49 struct nf_conn_timeout *nf_ct_timeout_ext_add(struct nf_conn *ct,
50                                               struct ctnl_timeout *timeout,
51                                               gfp_t gfp)
52 {
53 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
54         struct nf_conn_timeout *timeout_ext;
55
56         timeout_ext = nf_ct_ext_add(ct, NF_CT_EXT_TIMEOUT, gfp);
57         if (timeout_ext == NULL)
58                 return NULL;
59
60         rcu_assign_pointer(timeout_ext->timeout, timeout);
61
62         return timeout_ext;
63 #else
64         return NULL;
65 #endif
66 };
67
68 static inline unsigned int *
69 nf_ct_timeout_lookup(struct net *net, struct nf_conn *ct,
70                      struct nf_conntrack_l4proto *l4proto)
71 {
72 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
73         struct nf_conn_timeout *timeout_ext;
74         unsigned int *timeouts;
75
76         timeout_ext = nf_ct_timeout_find(ct);
77         if (timeout_ext) {
78                 timeouts = nf_ct_timeout_data(timeout_ext);
79                 if (unlikely(!timeouts))
80                         timeouts = l4proto->get_timeouts(net);
81         } else {
82                 timeouts = l4proto->get_timeouts(net);
83         }
84
85         return timeouts;
86 #else
87         return l4proto->get_timeouts(net);
88 #endif
89 }
90
91 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
92 int nf_conntrack_timeout_init(void);
93 void nf_conntrack_timeout_fini(void);
94 #else
95 static inline int nf_conntrack_timeout_init(void)
96 {
97         return 0;
98 }
99
100 static inline void nf_conntrack_timeout_fini(void)
101 {
102         return;
103 }
104 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
105
106 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
107 extern struct ctnl_timeout *(*nf_ct_timeout_find_get_hook)(struct net *net, const char *name);
108 extern void (*nf_ct_timeout_put_hook)(struct ctnl_timeout *timeout);
109 #endif
110
111 #endif /* _NF_CONNTRACK_TIMEOUT_H */