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 /* Connection tracking event types */
16 enum ip_conntrack_events {
17 IPCT_NEW, /* new conntrack */
18 IPCT_RELATED, /* related conntrack */
19 IPCT_DESTROY, /* destroyed conntrack */
20 IPCT_REPLY, /* connection has seen two-way traffic */
21 IPCT_ASSURED, /* connection status has changed to assured */
22 IPCT_PROTOINFO, /* protocol information has changed */
23 IPCT_HELPER, /* new helper has been set */
24 IPCT_MARK, /* new mark has been set */
25 IPCT_NATSEQADJ, /* NAT is doing sequence adjustment */
26 IPCT_SECMARK, /* new security mark has been set */
29 enum ip_conntrack_expect_events {
30 IPEXP_NEW, /* new expectation */
33 struct nf_conntrack_ecache {
34 unsigned long cache; /* bitops want long */
35 unsigned long missed; /* missed events */
36 u32 pid; /* netlink pid of destroyer */
39 static inline struct nf_conntrack_ecache *
40 nf_ct_ecache_find(const struct nf_conn *ct)
42 return nf_ct_ext_find(ct, NF_CT_EXT_ECACHE);
45 static inline struct nf_conntrack_ecache *
46 nf_ct_ecache_ext_add(struct nf_conn *ct, gfp_t gfp)
48 struct net *net = nf_ct_net(ct);
50 if (!net->ct.sysctl_events)
53 return nf_ct_ext_add(ct, NF_CT_EXT_ECACHE, gfp);
56 #ifdef CONFIG_NF_CONNTRACK_EVENTS
57 /* This structure is passed to event handler */
64 struct nf_ct_event_notifier {
65 int (*fcn)(unsigned int events, struct nf_ct_event *item);
68 extern struct nf_ct_event_notifier *nf_conntrack_event_cb;
69 extern int nf_conntrack_register_notifier(struct nf_ct_event_notifier *nb);
70 extern void nf_conntrack_unregister_notifier(struct nf_ct_event_notifier *nb);
72 extern void nf_ct_deliver_cached_events(struct nf_conn *ct);
75 nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
77 struct nf_conntrack_ecache *e;
79 if (nf_conntrack_event_cb == NULL)
82 e = nf_ct_ecache_find(ct);
86 set_bit(event, &e->cache);
90 nf_conntrack_eventmask_report(unsigned int eventmask,
96 struct net *net = nf_ct_net(ct);
97 struct nf_ct_event_notifier *notify;
98 struct nf_conntrack_ecache *e;
101 notify = rcu_dereference(nf_conntrack_event_cb);
105 if (!net->ct.sysctl_events)
108 e = nf_ct_ecache_find(ct);
112 if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct)) {
113 struct nf_ct_event item = {
115 .pid = e->pid ? e->pid : pid,
118 /* This is a resent of a destroy event? If so, skip missed */
119 unsigned long missed = e->pid ? 0 : e->missed;
121 ret = notify->fcn(eventmask | missed, &item);
122 if (unlikely(ret < 0 || missed)) {
123 spin_lock_bh(&ct->lock);
125 /* This is a destroy event that has been
126 * triggered by a process, we store the PID
127 * to include it in the retransmission. */
128 if (eventmask & (1 << IPCT_DESTROY) &&
129 e->pid == 0 && pid != 0)
132 e->missed |= eventmask;
134 e->missed &= ~missed;
135 spin_unlock_bh(&ct->lock);
144 nf_conntrack_event_report(enum ip_conntrack_events event, struct nf_conn *ct,
147 return nf_conntrack_eventmask_report(1 << event, ct, pid, report);
151 nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
153 return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
156 struct nf_exp_event {
157 struct nf_conntrack_expect *exp;
162 struct nf_exp_event_notifier {
163 int (*fcn)(unsigned int events, struct nf_exp_event *item);
166 extern struct nf_exp_event_notifier *nf_expect_event_cb;
167 extern int nf_ct_expect_register_notifier(struct nf_exp_event_notifier *nb);
168 extern void nf_ct_expect_unregister_notifier(struct nf_exp_event_notifier *nb);
171 nf_ct_expect_event_report(enum ip_conntrack_expect_events event,
172 struct nf_conntrack_expect *exp,
176 struct net *net = nf_ct_exp_net(exp);
177 struct nf_exp_event_notifier *notify;
180 notify = rcu_dereference(nf_expect_event_cb);
184 if (!net->ct.sysctl_events)
188 struct nf_exp_event item = {
193 notify->fcn(1 << event, &item);
200 nf_ct_expect_event(enum ip_conntrack_expect_events event,
201 struct nf_conntrack_expect *exp)
203 nf_ct_expect_event_report(event, exp, 0, 0);
206 extern int nf_conntrack_ecache_init(struct net *net);
207 extern void nf_conntrack_ecache_fini(struct net *net);
209 #else /* CONFIG_NF_CONNTRACK_EVENTS */
211 static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
212 struct nf_conn *ct) {}
213 static inline int nf_conntrack_eventmask_report(unsigned int eventmask,
216 int report) { return 0; }
217 static inline int nf_conntrack_event(enum ip_conntrack_events event,
218 struct nf_conn *ct) { return 0; }
219 static inline int nf_conntrack_event_report(enum ip_conntrack_events event,
222 int report) { return 0; }
223 static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
224 static inline void nf_ct_expect_event(enum ip_conntrack_expect_events event,
225 struct nf_conntrack_expect *exp) {}
226 static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e,
227 struct nf_conntrack_expect *exp,
231 static inline int nf_conntrack_ecache_init(struct net *net)
236 static inline void nf_conntrack_ecache_fini(struct net *net)
239 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
241 #endif /*_NF_CONNTRACK_ECACHE_H*/