1 /* SPDX-License-Identifier: GPL-2.0 */
3 * connection tracking event cache.
6 #ifndef _NF_CONNTRACK_ECACHE_H
7 #define _NF_CONNTRACK_ECACHE_H
8 #include <net/netfilter/nf_conntrack.h>
10 #include <net/net_namespace.h>
11 #include <net/netfilter/nf_conntrack_expect.h>
12 #include <linux/netfilter/nf_conntrack_common.h>
13 #include <linux/netfilter/nf_conntrack_tuple_common.h>
14 #include <net/netfilter/nf_conntrack_extend.h>
16 enum nf_ct_ecache_state
{
17 NFCT_ECACHE_UNKNOWN
, /* destroy event not sent */
18 NFCT_ECACHE_DESTROY_FAIL
, /* tried but failed to send destroy event */
19 NFCT_ECACHE_DESTROY_SENT
, /* sent destroy event after failure */
22 struct nf_conntrack_ecache
{
23 unsigned long cache
; /* bitops want long */
24 u16 missed
; /* missed events */
25 u16 ctmask
; /* bitmask of ct events to be delivered */
26 u16 expmask
; /* bitmask of expect events to be delivered */
27 enum nf_ct_ecache_state state
:8;/* ecache state */
28 u32 portid
; /* netlink portid of destroyer */
31 static inline struct nf_conntrack_ecache
*
32 nf_ct_ecache_find(const struct nf_conn
*ct
)
34 #ifdef CONFIG_NF_CONNTRACK_EVENTS
35 return nf_ct_ext_find(ct
, NF_CT_EXT_ECACHE
);
41 static inline struct nf_conntrack_ecache
*
42 nf_ct_ecache_ext_add(struct nf_conn
*ct
, u16 ctmask
, u16 expmask
, gfp_t gfp
)
44 #ifdef CONFIG_NF_CONNTRACK_EVENTS
45 struct net
*net
= nf_ct_net(ct
);
46 struct nf_conntrack_ecache
*e
;
48 if (!ctmask
&& !expmask
&& net
->ct
.sysctl_events
) {
52 if (!ctmask
&& !expmask
)
55 e
= nf_ct_ext_add(ct
, NF_CT_EXT_ECACHE
, gfp
);
66 #ifdef CONFIG_NF_CONNTRACK_EVENTS
67 /* This structure is passed to event handler */
74 struct nf_ct_event_notifier
{
75 int (*fcn
)(unsigned int events
, struct nf_ct_event
*item
);
78 int nf_conntrack_register_notifier(struct net
*net
,
79 struct nf_ct_event_notifier
*nb
);
80 void nf_conntrack_unregister_notifier(struct net
*net
,
81 struct nf_ct_event_notifier
*nb
);
83 void nf_ct_deliver_cached_events(struct nf_conn
*ct
);
84 int nf_conntrack_eventmask_report(unsigned int eventmask
, struct nf_conn
*ct
,
85 u32 portid
, int report
);
88 nf_conntrack_event_cache(enum ip_conntrack_events event
, struct nf_conn
*ct
)
90 struct net
*net
= nf_ct_net(ct
);
91 struct nf_conntrack_ecache
*e
;
93 if (!rcu_access_pointer(net
->ct
.nf_conntrack_event_cb
))
96 e
= nf_ct_ecache_find(ct
);
100 set_bit(event
, &e
->cache
);
104 nf_conntrack_event_report(enum ip_conntrack_events event
, struct nf_conn
*ct
,
105 u32 portid
, int report
)
107 const struct net
*net
= nf_ct_net(ct
);
109 if (!rcu_access_pointer(net
->ct
.nf_conntrack_event_cb
))
112 return nf_conntrack_eventmask_report(1 << event
, ct
, portid
, report
);
116 nf_conntrack_event(enum ip_conntrack_events event
, struct nf_conn
*ct
)
118 const struct net
*net
= nf_ct_net(ct
);
120 if (!rcu_access_pointer(net
->ct
.nf_conntrack_event_cb
))
123 return nf_conntrack_eventmask_report(1 << event
, ct
, 0, 0);
126 struct nf_exp_event
{
127 struct nf_conntrack_expect
*exp
;
132 struct nf_exp_event_notifier
{
133 int (*fcn
)(unsigned int events
, struct nf_exp_event
*item
);
136 int nf_ct_expect_register_notifier(struct net
*net
,
137 struct nf_exp_event_notifier
*nb
);
138 void nf_ct_expect_unregister_notifier(struct net
*net
,
139 struct nf_exp_event_notifier
*nb
);
141 void nf_ct_expect_event_report(enum ip_conntrack_expect_events event
,
142 struct nf_conntrack_expect
*exp
,
143 u32 portid
, int report
);
145 int nf_conntrack_ecache_pernet_init(struct net
*net
);
146 void nf_conntrack_ecache_pernet_fini(struct net
*net
);
148 int nf_conntrack_ecache_init(void);
149 void nf_conntrack_ecache_fini(void);
151 static inline void nf_conntrack_ecache_delayed_work(struct net
*net
)
153 if (!delayed_work_pending(&net
->ct
.ecache_dwork
)) {
154 schedule_delayed_work(&net
->ct
.ecache_dwork
, HZ
);
155 net
->ct
.ecache_dwork_pending
= true;
159 static inline void nf_conntrack_ecache_work(struct net
*net
)
161 if (net
->ct
.ecache_dwork_pending
) {
162 net
->ct
.ecache_dwork_pending
= false;
163 mod_delayed_work(system_wq
, &net
->ct
.ecache_dwork
, 0);
166 #else /* CONFIG_NF_CONNTRACK_EVENTS */
167 static inline void nf_conntrack_event_cache(enum ip_conntrack_events event
,
168 struct nf_conn
*ct
) {}
169 static inline int nf_conntrack_eventmask_report(unsigned int eventmask
,
172 int report
) { return 0; }
173 static inline int nf_conntrack_event(enum ip_conntrack_events event
,
174 struct nf_conn
*ct
) { return 0; }
175 static inline int nf_conntrack_event_report(enum ip_conntrack_events event
,
178 int report
) { return 0; }
179 static inline void nf_ct_deliver_cached_events(const struct nf_conn
*ct
) {}
180 static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e
,
181 struct nf_conntrack_expect
*exp
,
185 static inline int nf_conntrack_ecache_pernet_init(struct net
*net
)
190 static inline void nf_conntrack_ecache_pernet_fini(struct net
*net
)
194 static inline int nf_conntrack_ecache_init(void)
199 static inline void nf_conntrack_ecache_fini(void)
203 static inline void nf_conntrack_ecache_delayed_work(struct net
*net
)
207 static inline void nf_conntrack_ecache_work(struct net
*net
)
210 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
212 #endif /*_NF_CONNTRACK_ECACHE_H*/