projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| f6180121 MJ |
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 |