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 #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 extern struct nf_ct_event_notifier __rcu *nf_conntrack_event_cb;
71 extern int nf_conntrack_register_notifier(struct nf_ct_event_notifier *nb);
72 extern void nf_conntrack_unregister_notifier(struct nf_ct_event_notifier *nb);
74 extern void nf_ct_deliver_cached_events(struct nf_conn *ct);
77 nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
79 struct nf_conntrack_ecache *e;
81 if (nf_conntrack_event_cb == NULL)
84 e = nf_ct_ecache_find(ct);
88 set_bit(event, &e->cache);
92 nf_conntrack_eventmask_report(unsigned int eventmask,
98 struct nf_ct_event_notifier *notify;
99 struct nf_conntrack_ecache *e;
102 notify = rcu_dereference(nf_conntrack_event_cb);
106 e = nf_ct_ecache_find(ct);
110 if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct)) {
111 struct nf_ct_event item = {
113 .pid = e->pid ? e->pid : pid,
116 /* This is a resent of a destroy event? If so, skip missed */
117 unsigned long missed = e->pid ? 0 : e->missed;
119 if (!((eventmask | missed) & e->ctmask))
122 ret = notify->fcn(eventmask | missed, &item);
123 if (unlikely(ret < 0 || missed)) {
124 spin_lock_bh(&ct->lock);
126 /* This is a destroy event that has been
127 * triggered by a process, we store the PID
128 * to include it in the retransmission. */
129 if (eventmask & (1 << IPCT_DESTROY) &&
130 e->pid == 0 && pid != 0)
133 e->missed |= eventmask;
135 e->missed &= ~missed;
136 spin_unlock_bh(&ct->lock);
145 nf_conntrack_event_report(enum ip_conntrack_events event, struct nf_conn *ct,
148 return nf_conntrack_eventmask_report(1 << event, ct, pid, report);
152 nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
154 return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
157 struct nf_exp_event {
158 struct nf_conntrack_expect *exp;
163 struct nf_exp_event_notifier {
164 int (*fcn)(unsigned int events, struct nf_exp_event *item);
167 extern struct nf_exp_event_notifier __rcu *nf_expect_event_cb;
168 extern int nf_ct_expect_register_notifier(struct nf_exp_event_notifier *nb);
169 extern void nf_ct_expect_unregister_notifier(struct nf_exp_event_notifier *nb);
172 nf_ct_expect_event_report(enum ip_conntrack_expect_events event,
173 struct nf_conntrack_expect *exp,
177 struct nf_exp_event_notifier *notify;
178 struct nf_conntrack_ecache *e;
181 notify = rcu_dereference(nf_expect_event_cb);
185 e = nf_ct_ecache_find(exp->master);
189 if (e->expmask & (1 << event)) {
190 struct nf_exp_event item = {
195 notify->fcn(1 << event, &item);
202 nf_ct_expect_event(enum ip_conntrack_expect_events event,
203 struct nf_conntrack_expect *exp)
205 nf_ct_expect_event_report(event, exp, 0, 0);
208 extern int nf_conntrack_ecache_init(struct net *net);
209 extern void nf_conntrack_ecache_fini(struct net *net);
211 #else /* CONFIG_NF_CONNTRACK_EVENTS */
213 static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
214 struct nf_conn *ct) {}
215 static inline int nf_conntrack_eventmask_report(unsigned int eventmask,
218 int report) { return 0; }
219 static inline int nf_conntrack_event(enum ip_conntrack_events event,
220 struct nf_conn *ct) { return 0; }
221 static inline int nf_conntrack_event_report(enum ip_conntrack_events event,
224 int report) { return 0; }
225 static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
226 static inline void nf_ct_expect_event(enum ip_conntrack_expect_events event,
227 struct nf_conntrack_expect *exp) {}
228 static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e,
229 struct nf_conntrack_expect *exp,
233 static inline int nf_conntrack_ecache_init(struct net *net)
238 static inline void nf_conntrack_ecache_fini(struct net *net)
241 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
243 #endif /*_NF_CONNTRACK_ECACHE_H*/