2 * connection tracking event cache.
5 #ifndef _NF_CONNTRACK_ECACHE_H
6 #define _NF_CONNTRACK_ECACHE_H
7 #include <net/netfilter/nf_conntrack.h>
9 #include <net/net_namespace.h>
10 #include <net/netfilter/nf_conntrack_expect.h>
11 #include <linux/netfilter/nf_conntrack_common.h>
12 #include <linux/netfilter/nf_conntrack_tuple_common.h>
13 #include <net/netfilter/nf_conntrack_extend.h>
15 struct nf_conntrack_ecache
{
16 unsigned long cache
; /* bitops want long */
17 unsigned long missed
; /* missed events */
18 u16 ctmask
; /* bitmask of ct events to be delivered */
19 u16 expmask
; /* bitmask of expect events to be delivered */
20 u32 pid
; /* netlink pid of destroyer */
23 static inline struct nf_conntrack_ecache
*
24 nf_ct_ecache_find(const struct nf_conn
*ct
)
26 return nf_ct_ext_find(ct
, NF_CT_EXT_ECACHE
);
29 static inline struct nf_conntrack_ecache
*
30 nf_ct_ecache_ext_add(struct nf_conn
*ct
, u16 ctmask
, u16 expmask
, gfp_t gfp
)
32 struct net
*net
= nf_ct_net(ct
);
33 struct nf_conntrack_ecache
*e
;
35 if (!ctmask
&& !expmask
&& net
->ct
.sysctl_events
) {
39 if (!ctmask
&& !expmask
)
42 e
= nf_ct_ext_add(ct
, NF_CT_EXT_ECACHE
, gfp
);
50 #ifdef CONFIG_NF_CONNTRACK_EVENTS
51 /* This structure is passed to event handler */
58 struct nf_ct_event_notifier
{
59 int (*fcn
)(unsigned int events
, struct nf_ct_event
*item
);
62 extern struct nf_ct_event_notifier
*nf_conntrack_event_cb
;
63 extern int nf_conntrack_register_notifier(struct nf_ct_event_notifier
*nb
);
64 extern void nf_conntrack_unregister_notifier(struct nf_ct_event_notifier
*nb
);
66 extern void nf_ct_deliver_cached_events(struct nf_conn
*ct
);
69 nf_conntrack_event_cache(enum ip_conntrack_events event
, struct nf_conn
*ct
)
71 struct nf_conntrack_ecache
*e
;
73 if (nf_conntrack_event_cb
== NULL
)
76 e
= nf_ct_ecache_find(ct
);
80 if (!(e
->ctmask
& (1 << event
)))
83 set_bit(event
, &e
->cache
);
87 nf_conntrack_eventmask_report(unsigned int eventmask
,
93 struct nf_ct_event_notifier
*notify
;
94 struct nf_conntrack_ecache
*e
;
97 notify
= rcu_dereference(nf_conntrack_event_cb
);
101 e
= nf_ct_ecache_find(ct
);
105 if (nf_ct_is_confirmed(ct
) && !nf_ct_is_dying(ct
)) {
106 struct nf_ct_event item
= {
108 .pid
= e
->pid
? e
->pid
: pid
,
111 /* This is a resent of a destroy event? If so, skip missed */
112 unsigned long missed
= e
->pid
? 0 : e
->missed
;
114 if (!((eventmask
| missed
) & e
->ctmask
))
117 ret
= notify
->fcn(eventmask
| missed
, &item
);
118 if (unlikely(ret
< 0 || missed
)) {
119 spin_lock_bh(&ct
->lock
);
121 /* This is a destroy event that has been
122 * triggered by a process, we store the PID
123 * to include it in the retransmission. */
124 if (eventmask
& (1 << IPCT_DESTROY
) &&
125 e
->pid
== 0 && pid
!= 0)
128 e
->missed
|= eventmask
;
130 e
->missed
&= ~missed
;
131 spin_unlock_bh(&ct
->lock
);
140 nf_conntrack_event_report(enum ip_conntrack_events event
, struct nf_conn
*ct
,
143 return nf_conntrack_eventmask_report(1 << event
, ct
, pid
, report
);
147 nf_conntrack_event(enum ip_conntrack_events event
, struct nf_conn
*ct
)
149 return nf_conntrack_eventmask_report(1 << event
, ct
, 0, 0);
152 struct nf_exp_event
{
153 struct nf_conntrack_expect
*exp
;
158 struct nf_exp_event_notifier
{
159 int (*fcn
)(unsigned int events
, struct nf_exp_event
*item
);
162 extern struct nf_exp_event_notifier
*nf_expect_event_cb
;
163 extern int nf_ct_expect_register_notifier(struct nf_exp_event_notifier
*nb
);
164 extern void nf_ct_expect_unregister_notifier(struct nf_exp_event_notifier
*nb
);
167 nf_ct_expect_event_report(enum ip_conntrack_expect_events event
,
168 struct nf_conntrack_expect
*exp
,
172 struct nf_exp_event_notifier
*notify
;
173 struct nf_conntrack_ecache
*e
;
176 notify
= rcu_dereference(nf_expect_event_cb
);
180 e
= nf_ct_ecache_find(exp
->master
);
184 if (e
->expmask
& (1 << event
)) {
185 struct nf_exp_event item
= {
190 notify
->fcn(1 << event
, &item
);
197 nf_ct_expect_event(enum ip_conntrack_expect_events event
,
198 struct nf_conntrack_expect
*exp
)
200 nf_ct_expect_event_report(event
, exp
, 0, 0);
203 extern int nf_conntrack_ecache_init(struct net
*net
);
204 extern void nf_conntrack_ecache_fini(struct net
*net
);
206 #else /* CONFIG_NF_CONNTRACK_EVENTS */
208 static inline void nf_conntrack_event_cache(enum ip_conntrack_events event
,
209 struct nf_conn
*ct
) {}
210 static inline int nf_conntrack_eventmask_report(unsigned int eventmask
,
213 int report
) { return 0; }
214 static inline int nf_conntrack_event(enum ip_conntrack_events event
,
215 struct nf_conn
*ct
) { return 0; }
216 static inline int nf_conntrack_event_report(enum ip_conntrack_events event
,
219 int report
) { return 0; }
220 static inline void nf_ct_deliver_cached_events(const struct nf_conn
*ct
) {}
221 static inline void nf_ct_expect_event(enum ip_conntrack_expect_events event
,
222 struct nf_conntrack_expect
*exp
) {}
223 static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e
,
224 struct nf_conntrack_expect
*exp
,
228 static inline int nf_conntrack_ecache_init(struct net
*net
)
233 static inline void nf_conntrack_ecache_fini(struct net
*net
)
236 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
238 #endif /*_NF_CONNTRACK_ECACHE_H*/