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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/net_namespace.h>
#include <net/netfilter/nf_conntrack_expect.h>
#ifdef CONFIG_NF_CONNTRACK_EVENTS
struct nf_conntrack_ecache {
struct nf_conn *ct;
unsigned int events;
};
extern struct atomic_notifier_head nf_conntrack_chain;
extern int nf_conntrack_register_notifier(struct notifier_block *nb);
extern int nf_conntrack_unregister_notifier(struct notifier_block *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(struct net *net);
static inline void
nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
{
struct net *net = nf_ct_net(ct);
struct nf_conntrack_ecache *ecache;
local_bh_disable();
ecache = per_cpu_ptr(net->ct.ecache, raw_smp_processor_id());
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);
}
extern struct atomic_notifier_head nf_ct_expect_chain;
extern int nf_ct_expect_register_notifier(struct notifier_block *nb);
extern int nf_ct_expect_unregister_notifier(struct notifier_block *nb);
static inline void
nf_ct_expect_event(enum ip_conntrack_expect_events event,
struct nf_conntrack_expect *exp)
{
atomic_notifier_call_chain(&nf_ct_expect_chain, event, exp);
}
extern int nf_conntrack_ecache_init(struct net *net);
extern void nf_conntrack_ecache_fini(struct net *net);
#else /* CONFIG_NF_CONNTRACK_EVENTS */
static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
struct nf_conn *ct) {}
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_ct_expect_event(enum ip_conntrack_expect_events event,
struct nf_conntrack_expect *exp) {}
static inline void nf_ct_event_cache_flush(struct net *net) {}
static inline int nf_conntrack_ecache_init(struct net *net)
{
return 0;
}
static inline void nf_conntrack_ecache_fini(struct net *net)
{
}
#endif /* CONFIG_NF_CONNTRACK_EVENTS */
#endif /*_NF_CONNTRACK_ECACHE_H*/
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