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 set_bit(event, &e->cache);
84 nf_conntrack_eventmask_report(unsigned int eventmask,
90 struct nf_ct_event_notifier *notify;
91 struct nf_conntrack_ecache *e;
94 notify = rcu_dereference(nf_conntrack_event_cb);
98 e = nf_ct_ecache_find(ct);
102 if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct)) {
103 struct nf_ct_event item = {
105 .pid = e->pid ? e->pid : pid,
108 /* This is a resent of a destroy event? If so, skip missed */
109 unsigned long missed = e->pid ? 0 : e->missed;
111 if (!((eventmask | missed) & e->ctmask))
114 ret = notify->fcn(eventmask | missed, &item);
115 if (unlikely(ret < 0 || missed)) {
116 spin_lock_bh(&ct->lock);
118 /* This is a destroy event that has been
119 * triggered by a process, we store the PID
120 * to include it in the retransmission. */
121 if (eventmask & (1 << IPCT_DESTROY) &&
122 e->pid == 0 && pid != 0)
125 e->missed |= eventmask;
127 e->missed &= ~missed;
128 spin_unlock_bh(&ct->lock);
137 nf_conntrack_event_report(enum ip_conntrack_events event, struct nf_conn *ct,
140 return nf_conntrack_eventmask_report(1 << event, ct, pid, report);
144 nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
146 return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
149 struct nf_exp_event {
150 struct nf_conntrack_expect *exp;
155 struct nf_exp_event_notifier {
156 int (*fcn)(unsigned int events, struct nf_exp_event *item);
159 extern struct nf_exp_event_notifier *nf_expect_event_cb;
160 extern int nf_ct_expect_register_notifier(struct nf_exp_event_notifier *nb);
161 extern void nf_ct_expect_unregister_notifier(struct nf_exp_event_notifier *nb);
164 nf_ct_expect_event_report(enum ip_conntrack_expect_events event,
165 struct nf_conntrack_expect *exp,
169 struct nf_exp_event_notifier *notify;
170 struct nf_conntrack_ecache *e;
173 notify = rcu_dereference(nf_expect_event_cb);
177 e = nf_ct_ecache_find(exp->master);
181 if (e->expmask & (1 << event)) {
182 struct nf_exp_event item = {
187 notify->fcn(1 << event, &item);
194 nf_ct_expect_event(enum ip_conntrack_expect_events event,
195 struct nf_conntrack_expect *exp)
197 nf_ct_expect_event_report(event, exp, 0, 0);
200 extern int nf_conntrack_ecache_init(struct net *net);
201 extern void nf_conntrack_ecache_fini(struct net *net);
203 #else /* CONFIG_NF_CONNTRACK_EVENTS */
205 static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
206 struct nf_conn *ct) {}
207 static inline int nf_conntrack_eventmask_report(unsigned int eventmask,
210 int report) { return 0; }
211 static inline int nf_conntrack_event(enum ip_conntrack_events event,
212 struct nf_conn *ct) { return 0; }
213 static inline int nf_conntrack_event_report(enum ip_conntrack_events event,
216 int report) { return 0; }
217 static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
218 static inline void nf_ct_expect_event(enum ip_conntrack_expect_events event,
219 struct nf_conntrack_expect *exp) {}
220 static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e,
221 struct nf_conntrack_expect *exp,
225 static inline int nf_conntrack_ecache_init(struct net *net)
230 static inline void nf_conntrack_ecache_fini(struct net *net)
233 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
235 #endif /*_NF_CONNTRACK_ECACHE_H*/