include/net/netfilter/nf_conntrack_core.h

   1 /*
   2  * This header is used to share core functionality between the
   3  * standalone connection tracking module, and the compatibility layer's use
   4  * of connection tracking.
   5  *
   6  * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
   7  *      - generalize L3 protocol dependent part.
   8  *
   9  * Derived from include/linux/netfiter_ipv4/ip_conntrack_core.h
  10  */
  11
  12 #ifndef _NF_CONNTRACK_CORE_H
  13 #define _NF_CONNTRACK_CORE_H
  14
  15 #include <linux/netfilter.h>
  16 #include <net/netfilter/nf_conntrack_l3proto.h>
  17 #include <net/netfilter/nf_conntrack_l4proto.h>
  18 #include <net/netfilter/nf_conntrack_ecache.h>
  19
  20 /* This header is used to share core functionality between the
  21    standalone connection tracking module, and the compatibility layer's use
  22    of connection tracking. */
  23 extern unsigned int nf_conntrack_in(struct net *net,
  24                                     u_int8_t pf,
  25                                     unsigned int hooknum,
  26                                     struct sk_buff *skb);
  27
  28 extern int nf_conntrack_init(struct net *net);
  29 extern void nf_conntrack_cleanup(struct net *net);
  30
  31 extern int nf_conntrack_proto_init(struct net *net);
  32 extern void nf_conntrack_proto_fini(struct net *net);
  33
  34 extern bool
  35 nf_ct_get_tuple(const struct sk_buff *skb,
  36                 unsigned int nhoff,
  37                 unsigned int dataoff,
  38                 u_int16_t l3num,
  39                 u_int8_t protonum,
  40                 struct nf_conntrack_tuple *tuple,
  41                 const struct nf_conntrack_l3proto *l3proto,
  42                 const struct nf_conntrack_l4proto *l4proto);
  43
  44 extern bool
  45 nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
  46                    const struct nf_conntrack_tuple *orig,
  47                    const struct nf_conntrack_l3proto *l3proto,
  48                    const struct nf_conntrack_l4proto *l4proto);
  49
  50 /* Find a connection corresponding to a tuple. */
  51 extern struct nf_conntrack_tuple_hash *
  52 nf_conntrack_find_get(struct net *net, u16 zone,
  53                       const struct nf_conntrack_tuple *tuple);
  54
  55 extern int __nf_conntrack_confirm(struct sk_buff *skb);
  56
  57 /* Confirm a connection: returns NF_DROP if packet must be dropped. */
  58 static inline int nf_conntrack_confirm(struct sk_buff *skb)
  59 {
  60         struct nf_conn *ct = (struct nf_conn *)skb->nfct;
  61         int ret = NF_ACCEPT;
  62
  63         if (ct && !nf_ct_is_untracked(ct)) {
  64                 if (!nf_ct_is_confirmed(ct))
  65                         ret = __nf_conntrack_confirm(skb);
  66                 if (likely(ret == NF_ACCEPT))
  67                         nf_ct_deliver_cached_events(ct);
  68         }
  69         return ret;
  70 }
  71
  72 int
  73 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
  74             const struct nf_conntrack_l3proto *l3proto,
  75             const struct nf_conntrack_l4proto *proto);
  76
  77 extern spinlock_t nf_conntrack_lock ;
  78
  79 #endif /* _NF_CONNTRACK_CORE_H */