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 portid
; /* netlink portid of destroyer */
23 static inline struct nf_conntrack_ecache
*
24 nf_ct_ecache_find(const struct nf_conn
*ct
)
26 #ifdef CONFIG_NF_CONNTRACK_EVENTS
27 return nf_ct_ext_find(ct
, NF_CT_EXT_ECACHE
);
33 static inline struct nf_conntrack_ecache
*
34 nf_ct_ecache_ext_add(struct nf_conn
*ct
, u16 ctmask
, u16 expmask
, gfp_t gfp
)
36 #ifdef CONFIG_NF_CONNTRACK_EVENTS
37 struct net
*net
= nf_ct_net(ct
);
38 struct nf_conntrack_ecache
*e
;
40 if (!ctmask
&& !expmask
&& net
->ct
.sysctl_events
) {
44 if (!ctmask
&& !expmask
)
47 e
= nf_ct_ext_add(ct
, NF_CT_EXT_ECACHE
, gfp
);
58 #ifdef CONFIG_NF_CONNTRACK_EVENTS
59 /* This structure is passed to event handler */
66 struct nf_ct_event_notifier
{
67 int (*fcn
)(unsigned int events
, struct nf_ct_event
*item
);
70 int nf_conntrack_register_notifier(struct net
*net
,
71 struct nf_ct_event_notifier
*nb
);
72 void nf_conntrack_unregister_notifier(struct net
*net
,
73 struct nf_ct_event_notifier
*nb
);
75 void nf_ct_deliver_cached_events(struct nf_conn
*ct
);
78 nf_conntrack_event_cache(enum ip_conntrack_events event
, struct nf_conn
*ct
)
80 struct net
*net
= nf_ct_net(ct
);
81 struct nf_conntrack_ecache
*e
;
83 if (!rcu_access_pointer(net
->ct
.nf_conntrack_event_cb
))
86 e
= nf_ct_ecache_find(ct
);
90 set_bit(event
, &e
->cache
);
94 nf_conntrack_eventmask_report(unsigned int eventmask
,
100 struct net
*net
= nf_ct_net(ct
);
101 struct nf_ct_event_notifier
*notify
;
102 struct nf_conntrack_ecache
*e
;
105 notify
= rcu_dereference(net
->ct
.nf_conntrack_event_cb
);
109 e
= nf_ct_ecache_find(ct
);
113 if (nf_ct_is_confirmed(ct
) && !nf_ct_is_dying(ct
)) {
114 struct nf_ct_event item
= {
116 .portid
= e
->portid
? e
->portid
: portid
,
119 /* This is a resent of a destroy event? If so, skip missed */
120 unsigned long missed
= e
->portid
? 0 : e
->missed
;
122 if (!((eventmask
| missed
) & e
->ctmask
))
125 ret
= notify
->fcn(eventmask
| missed
, &item
);
126 if (unlikely(ret
< 0 || missed
)) {
127 spin_lock_bh(&ct
->lock
);
129 /* This is a destroy event that has been
130 * triggered by a process, we store the PORTID
131 * to include it in the retransmission. */
132 if (eventmask
& (1 << IPCT_DESTROY
) &&
133 e
->portid
== 0 && portid
!= 0)
136 e
->missed
|= eventmask
;
138 e
->missed
&= ~missed
;
139 spin_unlock_bh(&ct
->lock
);
148 nf_conntrack_event_report(enum ip_conntrack_events event
, struct nf_conn
*ct
,
149 u32 portid
, int report
)
151 return nf_conntrack_eventmask_report(1 << event
, ct
, portid
, report
);
155 nf_conntrack_event(enum ip_conntrack_events event
, struct nf_conn
*ct
)
157 return nf_conntrack_eventmask_report(1 << event
, ct
, 0, 0);
160 struct nf_exp_event
{
161 struct nf_conntrack_expect
*exp
;
166 struct nf_exp_event_notifier
{
167 int (*fcn
)(unsigned int events
, struct nf_exp_event
*item
);
170 int nf_ct_expect_register_notifier(struct net
*net
,
171 struct nf_exp_event_notifier
*nb
);
172 void nf_ct_expect_unregister_notifier(struct net
*net
,
173 struct nf_exp_event_notifier
*nb
);
176 nf_ct_expect_event_report(enum ip_conntrack_expect_events event
,
177 struct nf_conntrack_expect
*exp
,
181 struct net
*net
= nf_ct_exp_net(exp
);
182 struct nf_exp_event_notifier
*notify
;
183 struct nf_conntrack_ecache
*e
;
186 notify
= rcu_dereference(net
->ct
.nf_expect_event_cb
);
190 e
= nf_ct_ecache_find(exp
->master
);
194 if (e
->expmask
& (1 << event
)) {
195 struct nf_exp_event item
= {
200 notify
->fcn(1 << event
, &item
);
207 nf_ct_expect_event(enum ip_conntrack_expect_events event
,
208 struct nf_conntrack_expect
*exp
)
210 nf_ct_expect_event_report(event
, exp
, 0, 0);
213 int nf_conntrack_ecache_pernet_init(struct net
*net
);
214 void nf_conntrack_ecache_pernet_fini(struct net
*net
);
216 int nf_conntrack_ecache_init(void);
217 void nf_conntrack_ecache_fini(void);
219 static inline void nf_conntrack_ecache_delayed_work(struct net
*net
)
221 if (!delayed_work_pending(&net
->ct
.ecache_dwork
)) {
222 schedule_delayed_work(&net
->ct
.ecache_dwork
, HZ
);
223 net
->ct
.ecache_dwork_pending
= true;
227 static inline void nf_conntrack_ecache_work(struct net
*net
)
229 if (net
->ct
.ecache_dwork_pending
) {
230 net
->ct
.ecache_dwork_pending
= false;
231 mod_delayed_work(system_wq
, &net
->ct
.ecache_dwork
, 0);
234 #else /* CONFIG_NF_CONNTRACK_EVENTS */
235 static inline void nf_conntrack_event_cache(enum ip_conntrack_events event
,
236 struct nf_conn
*ct
) {}
237 static inline int nf_conntrack_eventmask_report(unsigned int eventmask
,
240 int report
) { return 0; }
241 static inline int nf_conntrack_event(enum ip_conntrack_events event
,
242 struct nf_conn
*ct
) { return 0; }
243 static inline int nf_conntrack_event_report(enum ip_conntrack_events event
,
246 int report
) { return 0; }
247 static inline void nf_ct_deliver_cached_events(const struct nf_conn
*ct
) {}
248 static inline void nf_ct_expect_event(enum ip_conntrack_expect_events event
,
249 struct nf_conntrack_expect
*exp
) {}
250 static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e
,
251 struct nf_conntrack_expect
*exp
,
255 static inline int nf_conntrack_ecache_pernet_init(struct net
*net
)
260 static inline void nf_conntrack_ecache_pernet_fini(struct net
*net
)
264 static inline int nf_conntrack_ecache_init(void)
269 static inline void nf_conntrack_ecache_fini(void)
273 static inline void nf_conntrack_ecache_delayed_work(struct net
*net
)
277 static inline void nf_conntrack_ecache_work(struct net
*net
)
280 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
282 #endif /*_NF_CONNTRACK_ECACHE_H*/