include/net/netfilter/nf_conntrack_ecache.h

   1 /*
   2  * connection tracking event cache.
   3  */
   4
   5 #ifndef _NF_CONNTRACK_ECACHE_H
   6 #define _NF_CONNTRACK_ECACHE_H
   7 #include <net/netfilter/nf_conntrack.h>
   8
   9 #include <linux/notifier.h>
  10 #include <linux/interrupt.h>
  11 #include <net/netfilter/nf_conntrack_expect.h>
  12
  13 #ifdef CONFIG_NF_CONNTRACK_EVENTS
  14 struct nf_conntrack_ecache {
  15         struct nf_conn *ct;
  16         unsigned int events;
  17 };
  18 DECLARE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache);
  19
  20 #define CONNTRACK_ECACHE(x)     (__get_cpu_var(nf_conntrack_ecache).x)
  21
  22 extern struct atomic_notifier_head nf_conntrack_chain;
  23 extern int nf_conntrack_register_notifier(struct notifier_block *nb);
  24 extern int nf_conntrack_unregister_notifier(struct notifier_block *nb);
  25
  26 extern void nf_ct_deliver_cached_events(const struct nf_conn *ct);
  27 extern void __nf_ct_event_cache_init(struct nf_conn *ct);
  28 extern void nf_ct_event_cache_flush(void);
  29
  30 static inline void
  31 nf_conntrack_event_cache(enum ip_conntrack_events event,
  32                          const struct sk_buff *skb)
  33 {
  34         struct nf_conn *ct = (struct nf_conn *)skb->nfct;
  35         struct nf_conntrack_ecache *ecache;
  36
  37         local_bh_disable();
  38         ecache = &__get_cpu_var(nf_conntrack_ecache);
  39         if (ct != ecache->ct)
  40                 __nf_ct_event_cache_init(ct);
  41         ecache->events |= event;
  42         local_bh_enable();
  43 }
  44
  45 static inline void nf_conntrack_event(enum ip_conntrack_events event,
  46                                       struct nf_conn *ct)
  47 {
  48         if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct))
  49                 atomic_notifier_call_chain(&nf_conntrack_chain, event, ct);
  50 }
  51
  52 extern struct atomic_notifier_head nf_conntrack_expect_chain;
  53 extern int nf_conntrack_expect_register_notifier(struct notifier_block *nb);
  54 extern int nf_conntrack_expect_unregister_notifier(struct notifier_block *nb);
  55
  56 static inline void
  57 nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
  58                           struct nf_conntrack_expect *exp)
  59 {
  60         atomic_notifier_call_chain(&nf_conntrack_expect_chain, event, exp);
  61 }
  62
  63 #else /* CONFIG_NF_CONNTRACK_EVENTS */
  64
  65 static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
  66                                             const struct sk_buff *skb) {}
  67 static inline void nf_conntrack_event(enum ip_conntrack_events event,
  68                                       struct nf_conn *ct) {}
  69 static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
  70 static inline void
  71 nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
  72                           struct nf_conntrack_expect *exp) {}
  73 static inline void nf_ct_event_cache_flush(void) {}
  74 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
  75
  76 #endif /*_NF_CONNTRACK_ECACHE_H*/
  77