1 /* SPDX-License-Identifier: GPL-2.0 */
3 * connection tracking event cache.
6 #ifndef _NF_CONNTRACK_ECACHE_H
7 #define _NF_CONNTRACK_ECACHE_H
8 #include <net/netfilter/nf_conntrack.h>
10 #include <net/net_namespace.h>
11 #include <net/netfilter/nf_conntrack_expect.h>
12 #include <linux/netfilter/nf_conntrack_common.h>
13 #include <linux/netfilter/nf_conntrack_tuple_common.h>
14 #include <net/netfilter/nf_conntrack_extend.h>
16 enum nf_ct_ecache_state {
17 NFCT_ECACHE_UNKNOWN, /* destroy event not sent */
18 NFCT_ECACHE_DESTROY_FAIL, /* tried but failed to send destroy event */
19 NFCT_ECACHE_DESTROY_SENT, /* sent destroy event after failure */
22 struct nf_conntrack_ecache {
23 unsigned long cache; /* bitops want long */
24 u16 ctmask; /* bitmask of ct events to be delivered */
25 u16 expmask; /* bitmask of expect events to be delivered */
26 enum nf_ct_ecache_state state:8;/* ecache state */
27 u32 missed; /* missed events */
28 u32 portid; /* netlink portid of destroyer */
31 static inline struct nf_conntrack_ecache *
32 nf_ct_ecache_find(const struct nf_conn *ct)
34 #ifdef CONFIG_NF_CONNTRACK_EVENTS
35 return nf_ct_ext_find(ct, NF_CT_EXT_ECACHE);
41 static inline struct nf_conntrack_ecache *
42 nf_ct_ecache_ext_add(struct nf_conn *ct, u16 ctmask, u16 expmask, gfp_t gfp)
44 #ifdef CONFIG_NF_CONNTRACK_EVENTS
45 struct net *net = nf_ct_net(ct);
46 struct nf_conntrack_ecache *e;
48 if (!ctmask && !expmask && net->ct.sysctl_events) {
52 if (!ctmask && !expmask)
55 e = nf_ct_ext_add(ct, NF_CT_EXT_ECACHE, gfp);
66 #ifdef CONFIG_NF_CONNTRACK_EVENTS
68 /* This structure is passed to event handler */
76 struct nf_conntrack_expect *exp;
81 struct nf_ct_event_notifier {
82 int (*ct_event)(unsigned int events, const struct nf_ct_event *item);
83 int (*exp_event)(unsigned int events, const struct nf_exp_event *item);
86 void nf_conntrack_register_notifier(struct net *net,
87 const struct nf_ct_event_notifier *nb);
88 void nf_conntrack_unregister_notifier(struct net *net);
90 void nf_ct_deliver_cached_events(struct nf_conn *ct);
91 int nf_conntrack_eventmask_report(unsigned int eventmask, struct nf_conn *ct,
92 u32 portid, int report);
96 static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct)
100 static inline int nf_conntrack_eventmask_report(unsigned int eventmask,
111 nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
113 #ifdef CONFIG_NF_CONNTRACK_EVENTS
114 struct net *net = nf_ct_net(ct);
115 struct nf_conntrack_ecache *e;
117 if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
120 e = nf_ct_ecache_find(ct);
124 set_bit(event, &e->cache);
129 nf_conntrack_event_report(enum ip_conntrack_events event, struct nf_conn *ct,
130 u32 portid, int report)
132 #ifdef CONFIG_NF_CONNTRACK_EVENTS
133 const struct net *net = nf_ct_net(ct);
135 if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
138 return nf_conntrack_eventmask_report(1 << event, ct, portid, report);
145 nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
147 #ifdef CONFIG_NF_CONNTRACK_EVENTS
148 const struct net *net = nf_ct_net(ct);
150 if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
153 return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
159 #ifdef CONFIG_NF_CONNTRACK_EVENTS
160 void nf_ct_expect_event_report(enum ip_conntrack_expect_events event,
161 struct nf_conntrack_expect *exp,
162 u32 portid, int report);
164 void nf_conntrack_ecache_work(struct net *net, enum nf_ct_ecache_state state);
166 void nf_conntrack_ecache_pernet_init(struct net *net);
167 void nf_conntrack_ecache_pernet_fini(struct net *net);
169 static inline bool nf_conntrack_ecache_dwork_pending(const struct net *net)
171 return net->ct.ecache_dwork_pending;
173 #else /* CONFIG_NF_CONNTRACK_EVENTS */
175 static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e,
176 struct nf_conntrack_expect *exp,
182 static inline void nf_conntrack_ecache_work(struct net *net,
183 enum nf_ct_ecache_state s)
187 static inline void nf_conntrack_ecache_pernet_init(struct net *net)
191 static inline void nf_conntrack_ecache_pernet_fini(struct net *net)
194 static inline bool nf_conntrack_ecache_dwork_pending(const struct net *net) { return false; }
195 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
196 #endif /*_NF_CONNTRACK_ECACHE_H*/