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
  17 /* This header is used to share core functionality between the
  18    standalone connection tracking module, and the compatibility layer's use
  19    of connection tracking. */
  20 extern unsigned int nf_conntrack_in(int pf,
  21                                     unsigned int hooknum,
  22                                     struct sk_buff **pskb);
  23
  24 extern int nf_conntrack_init(void);
  25 extern void nf_conntrack_cleanup(void);
  26
  27 struct nf_conntrack_l3proto;
  28 extern struct nf_conntrack_l3proto *nf_ct_find_l3proto(u_int16_t pf);
  29 /* Like above, but you already have conntrack read lock. */
  30 extern struct nf_conntrack_l3proto *__nf_ct_find_l3proto(u_int16_t l3proto);
  31
  32 struct nf_conntrack_protocol;
  33
  34 extern int
  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_protocol *protocol);
  43
  44 extern int
  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_protocol *protocol);
  49
  50 /* Find a connection corresponding to a tuple. */
  51 extern struct nf_conntrack_tuple_hash *
  52 nf_conntrack_find_get(const struct nf_conntrack_tuple *tuple,
  53                       const struct nf_conn *ignored_conntrack);
  54
  55 extern int __nf_conntrack_confirm(struct sk_buff **pskb);
  56
  57 /* Confirm a connection: returns NF_DROP if packet must be dropped. */
  58 static inline int nf_conntrack_confirm(struct sk_buff **pskb)
  59 {
  60         struct nf_conn *ct = (struct nf_conn *)(*pskb)->nfct;
  61         int ret = NF_ACCEPT;
  62
  63         if (ct) {
  64                 if (!nf_ct_is_confirmed(ct))
  65                         ret = __nf_conntrack_confirm(pskb);
  66                 nf_ct_deliver_cached_events(ct);
  67         }
  68         return ret;
  69 }
  70
  71 extern void __nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb);
  72
  73 extern struct list_head *nf_conntrack_hash;
  74 extern struct list_head nf_conntrack_expect_list;
  75 extern rwlock_t nf_conntrack_lock ;
  76 #endif /* _NF_CONNTRACK_CORE_H */