1 /*
2 * connection tracking event cache.
3 */
4
5 #ifndef _NF_CONNTRACK_ECACHE_H
6 #define _NF_CONNTRACK_ECACHE_H
7 #include <net/netfilter/nf_conntrack.h>
8
9 #include <linux/notifier.h>
10 #include <linux/interrupt.h>
11 #include <net/net_namespace.h>
12 #include <net/netfilter/nf_conntrack_expect.h>
13
14 #ifdef CONFIG_NF_CONNTRACK_EVENTS
15 struct nf_conntrack_ecache {
16 struct nf_conn *ct;
17 unsigned int events;
18 };
19
20 /* This structure is passed to event handler */
21 struct nf_ct_event {
22 struct nf_conn *ct;
23 u32 pid;
24 int report;
25 };
26
27 extern struct atomic_notifier_head nf_conntrack_chain;
28 extern int nf_conntrack_register_notifier(struct notifier_block *nb);
29 extern int nf_conntrack_unregister_notifier(struct notifier_block *nb);
30
31 extern void nf_ct_deliver_cached_events(const struct nf_conn *ct);
32 extern void __nf_ct_event_cache_init(struct nf_conn *ct);
33 extern void nf_ct_event_cache_flush(struct net *net);
34
35 static inline void
nf_conntrack_event_cache(enum ip_conntrack_events event,struct nf_conn * ct)36 nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
37 {
38 struct net *net = nf_ct_net(ct);
39 struct nf_conntrack_ecache *ecache;
40
41 local_bh_disable();
42 ecache = per_cpu_ptr(net->ct.ecache, raw_smp_processor_id());
43 if (ct != ecache->ct)
44 __nf_ct_event_cache_init(ct);
45 ecache->events |= event;
46 local_bh_enable();
47 }
48
49 static inline void
nf_conntrack_event_report(enum ip_conntrack_events event,struct nf_conn * ct,u32 pid,int report)50 nf_conntrack_event_report(enum ip_conntrack_events event,
51 struct nf_conn *ct,
52 u32 pid,
53 int report)
54 {
55 struct nf_ct_event item = {
56 .ct = ct,
57 .pid = pid,
58 .report = report
59 };
60 if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct))
61 atomic_notifier_call_chain(&nf_conntrack_chain, event, &item);
62 }
63
64 static inline void
nf_conntrack_event(enum ip_conntrack_events event,struct nf_conn * ct)65 nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
66 {
67 nf_conntrack_event_report(event, ct, 0, 0);
68 }
69
70 struct nf_exp_event {
71 struct nf_conntrack_expect *exp;
72 u32 pid;
73 int report;
74 };
75
76 extern struct atomic_notifier_head nf_ct_expect_chain;
77 extern int nf_ct_expect_register_notifier(struct notifier_block *nb);
78 extern int nf_ct_expect_unregister_notifier(struct notifier_block *nb);
79
80 static inline void
nf_ct_expect_event_report(enum ip_conntrack_expect_events event,struct nf_conntrack_expect * exp,u32 pid,int report)81 nf_ct_expect_event_report(enum ip_conntrack_expect_events event,
82 struct nf_conntrack_expect *exp,
83 u32 pid,
84 int report)
85 {
86 struct nf_exp_event item = {
87 .exp = exp,
88 .pid = pid,
89 .report = report
90 };
91 atomic_notifier_call_chain(&nf_ct_expect_chain, event, &item);
92 }
93
94 static inline void
nf_ct_expect_event(enum ip_conntrack_expect_events event,struct nf_conntrack_expect * exp)95 nf_ct_expect_event(enum ip_conntrack_expect_events event,
96 struct nf_conntrack_expect *exp)
97 {
98 nf_ct_expect_event_report(event, exp, 0, 0);
99 }
100
101 extern int nf_conntrack_ecache_init(struct net *net);
102 extern void nf_conntrack_ecache_fini(struct net *net);
103
104 #else /* CONFIG_NF_CONNTRACK_EVENTS */
105
nf_conntrack_event_cache(enum ip_conntrack_events event,struct nf_conn * ct)106 static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
107 struct nf_conn *ct) {}
nf_conntrack_event(enum ip_conntrack_events event,struct nf_conn * ct)108 static inline void nf_conntrack_event(enum ip_conntrack_events event,
109 struct nf_conn *ct) {}
nf_conntrack_event_report(enum ip_conntrack_events event,struct nf_conn * ct,u32 pid,int report)110 static inline void nf_conntrack_event_report(enum ip_conntrack_events event,
111 struct nf_conn *ct,
112 u32 pid,
113 int report) {}
nf_ct_deliver_cached_events(const struct nf_conn * ct)114 static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
nf_ct_expect_event(enum ip_conntrack_expect_events event,struct nf_conntrack_expect * exp)115 static inline void nf_ct_expect_event(enum ip_conntrack_expect_events event,
116 struct nf_conntrack_expect *exp) {}
nf_ct_expect_event_report(enum ip_conntrack_expect_events e,struct nf_conntrack_expect * exp,u32 pid,int report)117 static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e,
118 struct nf_conntrack_expect *exp,
119 u32 pid,
120 int report) {}
nf_ct_event_cache_flush(struct net * net)121 static inline void nf_ct_event_cache_flush(struct net *net) {}
122
nf_conntrack_ecache_init(struct net * net)123 static inline int nf_conntrack_ecache_init(struct net *net)
124 {
125 return 0;
126 }
127
nf_conntrack_ecache_fini(struct net * net)128 static inline void nf_conntrack_ecache_fini(struct net *net)
129 {
130 }
131 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
132
133 #endif /*_NF_CONNTRACK_ECACHE_H*/
134
135