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- /*
- * connection tracking event cache.
- */
- #ifndef _NF_CONNTRACK_ECACHE_H
- #define _NF_CONNTRACK_ECACHE_H
- #include <net/netfilter/nf_conntrack.h>
- #include <linux/notifier.h>
- #include <linux/interrupt.h>
- #include <net/netfilter/nf_conntrack_expect.h>
- #ifdef CONFIG_NF_CONNTRACK_EVENTS
- struct nf_conntrack_ecache {
- struct nf_conn *ct;
- unsigned int events;
- };
- DECLARE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache);
- #define CONNTRACK_ECACHE(x) (__get_cpu_var(nf_conntrack_ecache).x)
- extern struct atomic_notifier_head nf_conntrack_chain;
- extern struct atomic_notifier_head nf_conntrack_expect_chain;
- static inline int nf_conntrack_register_notifier(struct notifier_block *nb)
- {
- return atomic_notifier_chain_register(&nf_conntrack_chain, nb);
- }
- static inline int nf_conntrack_unregister_notifier(struct notifier_block *nb)
- {
- return atomic_notifier_chain_unregister(&nf_conntrack_chain, nb);
- }
- static inline int
- nf_conntrack_expect_register_notifier(struct notifier_block *nb)
- {
- return atomic_notifier_chain_register(&nf_conntrack_expect_chain, nb);
- }
- static inline int
- nf_conntrack_expect_unregister_notifier(struct notifier_block *nb)
- {
- return atomic_notifier_chain_unregister(&nf_conntrack_expect_chain,
- nb);
- }
- extern void nf_ct_deliver_cached_events(const struct nf_conn *ct);
- extern void __nf_ct_event_cache_init(struct nf_conn *ct);
- extern void nf_ct_event_cache_flush(void);
- static inline void
- nf_conntrack_event_cache(enum ip_conntrack_events event,
- const struct sk_buff *skb)
- {
- struct nf_conn *ct = (struct nf_conn *)skb->nfct;
- struct nf_conntrack_ecache *ecache;
- local_bh_disable();
- ecache = &__get_cpu_var(nf_conntrack_ecache);
- if (ct != ecache->ct)
- __nf_ct_event_cache_init(ct);
- ecache->events |= event;
- local_bh_enable();
- }
- static inline void nf_conntrack_event(enum ip_conntrack_events event,
- struct nf_conn *ct)
- {
- if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct))
- atomic_notifier_call_chain(&nf_conntrack_chain, event, ct);
- }
- static inline void
- nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
- struct nf_conntrack_expect *exp)
- {
- atomic_notifier_call_chain(&nf_conntrack_expect_chain, event, exp);
- }
- #else /* CONFIG_NF_CONNTRACK_EVENTS */
- static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
- const struct sk_buff *skb) {}
- static inline void nf_conntrack_event(enum ip_conntrack_events event,
- struct nf_conn *ct) {}
- static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
- static inline void
- nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
- struct nf_conntrack_expect *exp) {}
- static inline void nf_ct_event_cache_flush(void) {}
- #endif /* CONFIG_NF_CONNTRACK_EVENTS */
- #endif /*_NF_CONNTRACK_ECACHE_H*/
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