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 int nf_conntrack_register_notifier(struct net *net, struct nf_ct_event_notifier *nb);
71 extern void nf_conntrack_unregister_notifier(struct net *net, struct nf_ct_event_notifier *nb);
73 extern void nf_ct_deliver_cached_events(struct nf_conn *ct);
76 nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
78 struct net *net = nf_ct_net(ct);
79 struct nf_conntrack_ecache *e;
81 if (net->ct.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 net *net = nf_ct_net(ct);
99 struct nf_ct_event_notifier *notify;
100 struct nf_conntrack_ecache *e;
103 notify = rcu_dereference(net->ct.nf_conntrack_event_cb);
107 e = nf_ct_ecache_find(ct);
111 if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct)) {
112 struct nf_ct_event item = {
114 .pid = e->pid ? e->pid : pid,
117 /* This is a resent of a destroy event? If so, skip missed */
118 unsigned long missed = e->pid ? 0 : e->missed;
120 if (!((eventmask | missed) & e->ctmask))
123 ret = notify->fcn(eventmask | missed, &item);
124 if (unlikely(ret < 0 || missed)) {
125 spin_lock_bh(&ct->lock);
127 /* This is a destroy event that has been
128 * triggered by a process, we store the PID
129 * to include it in the retransmission. */
130 if (eventmask & (1 << IPCT_DESTROY) &&
131 e->pid == 0 && pid != 0)
134 e->missed |= eventmask;
136 e->missed &= ~missed;
137 spin_unlock_bh(&ct->lock);
146 nf_conntrack_event_report(enum ip_conntrack_events event, struct nf_conn *ct,
149 return nf_conntrack_eventmask_report(1 << event, ct, pid, report);
153 nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
155 return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
158 struct nf_exp_event {
159 struct nf_conntrack_expect *exp;
164 struct nf_exp_event_notifier {
165 int (*fcn)(unsigned int events, struct nf_exp_event *item);
168 extern int nf_ct_expect_register_notifier(struct net *net, struct nf_exp_event_notifier *nb);
169 extern void nf_ct_expect_unregister_notifier(struct net *net, 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 net *net = nf_ct_exp_net(exp);
178 struct nf_exp_event_notifier *notify;
179 struct nf_conntrack_ecache *e;
182 notify = rcu_dereference(net->ct.nf_expect_event_cb);
186 e = nf_ct_ecache_find(exp->master);
190 if (e->expmask & (1 << event)) {
191 struct nf_exp_event item = {
196 notify->fcn(1 << event, &item);
203 nf_ct_expect_event(enum ip_conntrack_expect_events event,
204 struct nf_conntrack_expect *exp)
206 nf_ct_expect_event_report(event, exp, 0, 0);
209 extern int nf_conntrack_ecache_init(struct net *net);
210 extern void nf_conntrack_ecache_fini(struct net *net);
212 #else /* CONFIG_NF_CONNTRACK_EVENTS */
214 static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
215 struct nf_conn *ct) {}
216 static inline int nf_conntrack_eventmask_report(unsigned int eventmask,
219 int report) { return 0; }
220 static inline int nf_conntrack_event(enum ip_conntrack_events event,
221 struct nf_conn *ct) { return 0; }
222 static inline int nf_conntrack_event_report(enum ip_conntrack_events event,
225 int report) { return 0; }
226 static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
227 static inline void nf_ct_expect_event(enum ip_conntrack_expect_events event,
228 struct nf_conntrack_expect *exp) {}
229 static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e,
230 struct nf_conntrack_expect *exp,
234 static inline int nf_conntrack_ecache_init(struct net *net)
239 static inline void nf_conntrack_ecache_fini(struct net *net)
242 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
244 #endif /*_NF_CONNTRACK_ECACHE_H*/