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 if (!(e->ctmask & (1 << event)))
91 set_bit(event, &e->cache);
95 nf_conntrack_eventmask_report(unsigned int eventmask,
101 struct nf_ct_event_notifier *notify;
102 struct nf_conntrack_ecache *e;
105 notify = rcu_dereference(nf_conntrack_event_cb);
109 e = nf_ct_ecache_find(ct);
113 if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct)) {
114 struct nf_ct_event item = {
116 .pid = e->pid ? e->pid : pid,
119 /* This is a resent of a destroy event? If so, skip missed */
120 unsigned long missed = e->pid ? 0 : e->missed;
122 if (!((eventmask | missed) & e->ctmask))
125 ret = notify->fcn(eventmask | missed, &item);
126 if (unlikely(ret < 0 || missed)) {
127 spin_lock_bh(&ct->lock);
129 /* This is a destroy event that has been
130 * triggered by a process, we store the PID
131 * to include it in the retransmission. */
132 if (eventmask & (1 << IPCT_DESTROY) &&
133 e->pid == 0 && pid != 0)
136 e->missed |= eventmask;
138 e->missed &= ~missed;
139 spin_unlock_bh(&ct->lock);
148 nf_conntrack_event_report(enum ip_conntrack_events event, struct nf_conn *ct,
151 return nf_conntrack_eventmask_report(1 << event, ct, pid, report);
155 nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
157 return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
160 struct nf_exp_event {
161 struct nf_conntrack_expect *exp;
166 struct nf_exp_event_notifier {
167 int (*fcn)(unsigned int events, struct nf_exp_event *item);
170 extern struct nf_exp_event_notifier __rcu *nf_expect_event_cb;
171 extern int nf_ct_expect_register_notifier(struct nf_exp_event_notifier *nb);
172 extern void nf_ct_expect_unregister_notifier(struct nf_exp_event_notifier *nb);
175 nf_ct_expect_event_report(enum ip_conntrack_expect_events event,
176 struct nf_conntrack_expect *exp,
180 struct nf_exp_event_notifier *notify;
181 struct nf_conntrack_ecache *e;
184 notify = rcu_dereference(nf_expect_event_cb);
188 e = nf_ct_ecache_find(exp->master);
192 if (e->expmask & (1 << event)) {
193 struct nf_exp_event item = {
198 notify->fcn(1 << event, &item);
205 nf_ct_expect_event(enum ip_conntrack_expect_events event,
206 struct nf_conntrack_expect *exp)
208 nf_ct_expect_event_report(event, exp, 0, 0);
211 extern int nf_conntrack_ecache_init(struct net *net);
212 extern void nf_conntrack_ecache_fini(struct net *net);
214 #else /* CONFIG_NF_CONNTRACK_EVENTS */
216 static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
217 struct nf_conn *ct) {}
218 static inline int nf_conntrack_eventmask_report(unsigned int eventmask,
221 int report) { return 0; }
222 static inline int nf_conntrack_event(enum ip_conntrack_events event,
223 struct nf_conn *ct) { return 0; }
224 static inline int nf_conntrack_event_report(enum ip_conntrack_events event,
227 int report) { return 0; }
228 static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
229 static inline void nf_ct_expect_event(enum ip_conntrack_expect_events event,
230 struct nf_conntrack_expect *exp) {}
231 static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e,
232 struct nf_conntrack_expect *exp,
236 static inline int nf_conntrack_ecache_init(struct net *net)
241 static inline void nf_conntrack_ecache_fini(struct net *net)
244 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
246 #endif /*_NF_CONNTRACK_ECACHE_H*/