release/src-rt-6.x/linux/linux-2.6/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(int pf,
  24                                     unsigned int hooknum,
  25                                     struct sk_buff *skb);
  26
  27 extern int nf_conntrack_init(void);
  28 extern void nf_conntrack_cleanup(void);
  29
  30 extern int nf_conntrack_proto_init(void);
  31 extern void nf_conntrack_proto_fini(void);
  32
  33 struct nf_conntrack_l3proto;
  34 extern struct nf_conntrack_l3proto *nf_ct_find_l3proto(u_int16_t pf);
  35 /* Like above, but you already have conntrack read lock. */
  36 extern struct nf_conntrack_l3proto *__nf_ct_find_l3proto(u_int16_t l3proto);
  37
  38 struct nf_conntrack_l4proto;
  39
  40 extern int
  41 nf_ct_get_tuple(const struct sk_buff *skb,
  42                 unsigned int nhoff,
  43                 unsigned int dataoff,
  44                 u_int16_t l3num,
  45                 u_int8_t protonum,
  46                 struct nf_conntrack_tuple *tuple,
  47                 const struct nf_conntrack_l3proto *l3proto,
  48                 const struct nf_conntrack_l4proto *l4proto);
  49
  50 extern int
  51 nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
  52                    const struct nf_conntrack_tuple *orig,
  53                    const struct nf_conntrack_l3proto *l3proto,
  54                    const struct nf_conntrack_l4proto *l4proto);
  55
  56 /* Find a connection corresponding to a tuple. */
  57 extern struct nf_conntrack_tuple_hash *
  58 nf_conntrack_find_get(const struct nf_conntrack_tuple *tuple,
  59                       const struct nf_conn *ignored_conntrack);
  60
  61 extern int __nf_conntrack_confirm(struct sk_buff *skb);
  62
  63 /* Confirm a connection: returns NF_DROP if packet must be dropped. */
  64 static inline int nf_conntrack_confirm(struct sk_buff *skb)
  65 {
  66         struct nf_conn *ct = (struct nf_conn *)skb->nfct;
  67         int ret = NF_ACCEPT;
  68
  69         if (ct && ct != &nf_conntrack_untracked) {
  70                 if (!nf_ct_is_confirmed(ct))
  71                         ret = __nf_conntrack_confirm(skb);
  72                 if (likely(ret == NF_ACCEPT))
  73                         nf_ct_deliver_cached_events(ct);
  74         }
  75         return ret;
  76 }
  77
  78 extern void __nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb);
  79
  80 int
  81 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
  82             struct nf_conntrack_l3proto *l3proto,
  83             struct nf_conntrack_l4proto *proto);
  84
  85 extern struct list_head *nf_conntrack_hash;
  86 extern struct list_head nf_conntrack_expect_list;
  87 extern rwlock_t nf_conntrack_lock ;
  88 extern struct list_head unconfirmed;
  89
  90 #endif /* _NF_CONNTRACK_CORE_H */