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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/interrupt.h>
#include <net/net_namespace.h>
#include <net/netfilter/nf_conntrack_expect.h>
/* Connection tracking event bits */
enum ip_conntrack_events
{
/* New conntrack */
IPCT_NEW_BIT = 0,
IPCT_NEW = (1 << IPCT_NEW_BIT),
/* Expected connection */
IPCT_RELATED_BIT = 1,
IPCT_RELATED = (1 << IPCT_RELATED_BIT),
/* Destroyed conntrack */
IPCT_DESTROY_BIT = 2,
IPCT_DESTROY = (1 << IPCT_DESTROY_BIT),
/* Status has changed */
IPCT_STATUS_BIT = 3,
IPCT_STATUS = (1 << IPCT_STATUS_BIT),
/* Update of protocol info */
IPCT_PROTOINFO_BIT = 4,
IPCT_PROTOINFO = (1 << IPCT_PROTOINFO_BIT),
/* New helper for conntrack */
IPCT_HELPER_BIT = 5,
IPCT_HELPER = (1 << IPCT_HELPER_BIT),
/* Mark is set */
IPCT_MARK_BIT = 6,
IPCT_MARK = (1 << IPCT_MARK_BIT),
/* NAT sequence adjustment */
IPCT_NATSEQADJ_BIT = 7,
IPCT_NATSEQADJ = (1 << IPCT_NATSEQADJ_BIT),
/* Secmark is set */
IPCT_SECMARK_BIT = 8,
IPCT_SECMARK = (1 << IPCT_SECMARK_BIT),
};
enum ip_conntrack_expect_events {
IPEXP_NEW_BIT = 0,
IPEXP_NEW = (1 << IPEXP_NEW_BIT),
};
#ifdef CONFIG_NF_CONNTRACK_EVENTS
struct nf_conntrack_ecache {
struct nf_conn *ct;
unsigned int events;
};
/* This structure is passed to event handler */
struct nf_ct_event {
struct nf_conn *ct;
u32 pid;
int report;
};
struct nf_ct_event_notifier {
int (*fcn)(unsigned int events, struct nf_ct_event *item);
};
extern struct nf_ct_event_notifier *nf_conntrack_event_cb;
extern int nf_conntrack_register_notifier(struct nf_ct_event_notifier *nb);
extern void nf_conntrack_unregister_notifier(struct nf_ct_event_notifier *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_report(enum ip_conntrack_events event,
struct nf_conn *ct,
u32 pid,
int report)
{
struct nf_ct_event_notifier *notify;
rcu_read_lock();
notify = rcu_dereference(nf_conntrack_event_cb);
if (notify == NULL)
goto out_unlock;
if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct)) {
struct nf_ct_event item = {
.ct = ct,
.pid = pid,
.report = report
};
notify->fcn(event, &item);
}
out_unlock:
rcu_read_unlock();
}
static inline void
nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
{
nf_conntrack_event_report(event, ct, 0, 0);
}
struct nf_exp_event {
struct nf_conntrack_expect *exp;
u32 pid;
int report;
};
struct nf_exp_event_notifier {
int (*fcn)(unsigned int events, struct nf_exp_event *item);
};
extern struct nf_exp_event_notifier *nf_expect_event_cb;
extern int nf_ct_expect_register_notifier(struct nf_exp_event_notifier *nb);
extern void nf_ct_expect_unregister_notifier(struct nf_exp_event_notifier *nb);
static inline void
nf_ct_expect_event_report(enum ip_conntrack_expect_events event,
struct nf_conntrack_expect *exp,
u32 pid,
int report)
{
struct nf_exp_event_notifier *notify;
rcu_read_lock();
notify = rcu_dereference(nf_expect_event_cb);
if (notify == NULL)
goto out_unlock;
{
struct nf_exp_event item = {
.exp = exp,
.pid = pid,
.report = report
};
notify->fcn(event, &item);
}
out_unlock:
rcu_read_unlock();
}
static inline void
nf_ct_expect_event(enum ip_conntrack_expect_events event,
struct nf_conntrack_expect *exp)
{
nf_ct_expect_event_report(event, exp, 0, 0);
}
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_conntrack_event_report(enum ip_conntrack_events event,
struct nf_conn *ct,
u32 pid,
int report) {}
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_expect_event_report(enum ip_conntrack_expect_events e,
struct nf_conntrack_expect *exp,
u32 pid,
int report) {}
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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