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 int nf_conntrack_register_notifier(struct notifier_block *nb);
24 extern int nf_conntrack_unregister_notifier(struct notifier_block *nb);
25
26 extern void nf_ct_deliver_cached_events(const struct nf_conn *ct);
27 extern void __nf_ct_event_cache_init(struct nf_conn *ct);
28 extern void nf_ct_event_cache_flush(void);
29
30 static inline void
31 nf_conntrack_event_cache(enum ip_conntrack_events event,
32 const struct sk_buff *skb)
33 {
34 struct nf_conn *ct = (struct nf_conn *)skb->nfct;
35 struct nf_conntrack_ecache *ecache;
36
37 local_bh_disable();
38 ecache = &__get_cpu_var(nf_conntrack_ecache);
39 if (ct != ecache->ct)
40 __nf_ct_event_cache_init(ct);
41 ecache->events |= event;
42 local_bh_enable();
43 }
44
45 static inline void nf_conntrack_event(enum ip_conntrack_events event,
46 struct nf_conn *ct)
47 {
48 if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct))
49 atomic_notifier_call_chain(&nf_conntrack_chain, event, ct);
50 }
51
52 extern struct atomic_notifier_head nf_ct_expect_chain;
53 extern int nf_ct_expect_register_notifier(struct notifier_block *nb);
54 extern int nf_ct_expect_unregister_notifier(struct notifier_block *nb);
55
56 static inline void
57 nf_ct_expect_event(enum ip_conntrack_expect_events event,
58 struct nf_conntrack_expect *exp)
59 {
60 atomic_notifier_call_chain(&nf_ct_expect_chain, event, exp);
61 }
62
63 #else /* CONFIG_NF_CONNTRACK_EVENTS */
64
65 static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
66 const struct sk_buff *skb) {}
67 static inline void nf_conntrack_event(enum ip_conntrack_events event,
68 struct nf_conn *ct) {}
69 static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
70 static inline void nf_ct_expect_event(enum ip_conntrack_expect_events event,
71 struct nf_conntrack_expect *exp) {}
72 static inline void nf_ct_event_cache_flush(void) {}
73 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
74
75 #endif /*_NF_CONNTRACK_ECACHE_H*/
76
77
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