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[linux-2.6.git] / include / net / netfilter / nf_conntrack_ecache.h
1 /*
2  * connection tracking event cache.
3  */
4
5 #ifndef _NF_CONNTRACK_ECACHE_H
6 #define _NF_CONNTRACK_ECACHE_H
7 #include <net/netfilter/nf_conntrack.h>
8
9 #include <linux/notifier.h>
10 #include <linux/interrupt.h>
11 #include <net/netfilter/nf_conntrack_expect.h>
12
13 #ifdef CONFIG_NF_CONNTRACK_EVENTS
14 struct nf_conntrack_ecache {
15         struct nf_conn *ct;
16         unsigned int events;
17 };
18 DECLARE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache);
19
20 #define CONNTRACK_ECACHE(x)     (__get_cpu_var(nf_conntrack_ecache).x)
21
22 extern struct atomic_notifier_head nf_conntrack_chain;
23 extern struct atomic_notifier_head nf_conntrack_expect_chain;
24
25 static inline int nf_conntrack_register_notifier(struct notifier_block *nb)
26 {
27         return atomic_notifier_chain_register(&nf_conntrack_chain, nb);
28 }
29
30 static inline int nf_conntrack_unregister_notifier(struct notifier_block *nb)
31 {
32         return atomic_notifier_chain_unregister(&nf_conntrack_chain, nb);
33 }
34
35 static inline int
36 nf_conntrack_expect_register_notifier(struct notifier_block *nb)
37 {
38         return atomic_notifier_chain_register(&nf_conntrack_expect_chain, nb);
39 }
40
41 static inline int
42 nf_conntrack_expect_unregister_notifier(struct notifier_block *nb)
43 {
44         return atomic_notifier_chain_unregister(&nf_conntrack_expect_chain,
45                         nb);
46 }
47
48 extern void nf_ct_deliver_cached_events(const struct nf_conn *ct);
49 extern void __nf_ct_event_cache_init(struct nf_conn *ct);
50 extern void nf_ct_event_cache_flush(void);
51
52 static inline void
53 nf_conntrack_event_cache(enum ip_conntrack_events event,
54                          const struct sk_buff *skb)
55 {
56         struct nf_conn *ct = (struct nf_conn *)skb->nfct;
57         struct nf_conntrack_ecache *ecache;
58
59         local_bh_disable();
60         ecache = &__get_cpu_var(nf_conntrack_ecache);
61         if (ct != ecache->ct)
62                 __nf_ct_event_cache_init(ct);
63         ecache->events |= event;
64         local_bh_enable();
65 }
66
67 static inline void nf_conntrack_event(enum ip_conntrack_events event,
68                                       struct nf_conn *ct)
69 {
70         if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct))
71                 atomic_notifier_call_chain(&nf_conntrack_chain, event, ct);
72 }
73
74 static inline void
75 nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
76                           struct nf_conntrack_expect *exp)
77 {
78         atomic_notifier_call_chain(&nf_conntrack_expect_chain, event, exp);
79 }
80
81 #else /* CONFIG_NF_CONNTRACK_EVENTS */
82
83 static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
84                                             const struct sk_buff *skb) {}
85 static inline void nf_conntrack_event(enum ip_conntrack_events event,
86                                       struct nf_conn *ct) {}
87 static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
88 static inline void
89 nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
90                           struct nf_conntrack_expect *exp) {}
91 static inline void nf_ct_event_cache_flush(void) {}
92 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
93
94 #endif /*_NF_CONNTRACK_ECACHE_H*/
95