include/linux/netfilter_ipv4/ip_conntrack_core.h

   1 #ifndef _IP_CONNTRACK_CORE_H
   2 #define _IP_CONNTRACK_CORE_H
   3 #include <linux/netfilter.h>
   4 #include <linux/netfilter_ipv4/lockhelp.h>
   5
   6 /* This header is used to share core functionality between the
   7    standalone connection tracking module, and the compatibility layer's use
   8    of connection tracking. */
   9 extern unsigned int ip_conntrack_in(unsigned int hooknum,
  10                                     struct sk_buff **pskb,
  11                                     const struct net_device *in,
  12                                     const struct net_device *out,
  13                                     int (*okfn)(struct sk_buff *));
  14
  15 extern int ip_conntrack_init(void);
  16 extern void ip_conntrack_cleanup(void);
  17
  18 struct ip_conntrack_protocol;
  19
  20 extern int
  21 ip_ct_get_tuple(const struct iphdr *iph,
  22                 const struct sk_buff *skb,
  23                 unsigned int dataoff,
  24                 struct ip_conntrack_tuple *tuple,
  25                 const struct ip_conntrack_protocol *protocol);
  26
  27 extern int
  28 ip_ct_invert_tuple(struct ip_conntrack_tuple *inverse,
  29                    const struct ip_conntrack_tuple *orig,
  30                    const struct ip_conntrack_protocol *protocol);
  31
  32 /* Find a connection corresponding to a tuple. */
  33 struct ip_conntrack_tuple_hash *
  34 ip_conntrack_find_get(const struct ip_conntrack_tuple *tuple,
  35                       const struct ip_conntrack *ignored_conntrack);
  36
  37 extern int __ip_conntrack_confirm(struct sk_buff **pskb);
  38
  39 /* Confirm a connection: returns NF_DROP if packet must be dropped. */
  40 static inline int ip_conntrack_confirm(struct sk_buff **pskb)
  41 {
  42         if ((*pskb)->nfct
  43             && !is_confirmed((struct ip_conntrack *)(*pskb)->nfct))
  44                 return __ip_conntrack_confirm(pskb);
  45         return NF_ACCEPT;
  46 }
  47
  48 extern struct list_head *ip_conntrack_hash;
  49 extern struct list_head ip_conntrack_expect_list;
  50 DECLARE_RWLOCK_EXTERN(ip_conntrack_lock);
  51 #endif /* _IP_CONNTRACK_CORE_H */
  52