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 **pskb);
  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 extern int nf_conntrack_helper_init(void);
  34 extern void nf_conntrack_helper_fini(void);
  35
  36 struct nf_conntrack_l3proto;
  37 extern struct nf_conntrack_l3proto *nf_ct_find_l3proto(u_int16_t pf);
  38 /* Like above, but you already have conntrack read lock. */
  39 extern struct nf_conntrack_l3proto *__nf_ct_find_l3proto(u_int16_t l3proto);
  40
  41 struct nf_conntrack_l4proto;
  42
  43 extern int
  44 nf_ct_get_tuple(const struct sk_buff *skb,
  45                 unsigned int nhoff,
  46                 unsigned int dataoff,
  47                 u_int16_t l3num,
  48                 u_int8_t protonum,
  49                 struct nf_conntrack_tuple *tuple,
  50                 const struct nf_conntrack_l3proto *l3proto,
  51                 const struct nf_conntrack_l4proto *l4proto);
  52
  53 extern int
  54 nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
  55                    const struct nf_conntrack_tuple *orig,
  56                    const struct nf_conntrack_l3proto *l3proto,
  57                    const struct nf_conntrack_l4proto *l4proto);
  58
  59 /* Find a connection corresponding to a tuple. */
  60 extern struct nf_conntrack_tuple_hash *
  61 nf_conntrack_find_get(const struct nf_conntrack_tuple *tuple,
  62                       const struct nf_conn *ignored_conntrack);
  63
  64 extern int __nf_conntrack_confirm(struct sk_buff **pskb);
  65
  66 /* Confirm a connection: returns NF_DROP if packet must be dropped. */
  67 static inline int nf_conntrack_confirm(struct sk_buff **pskb)
  68 {
  69         struct nf_conn *ct = (struct nf_conn *)(*pskb)->nfct;
  70         int ret = NF_ACCEPT;
  71
  72         if (ct) {
  73                 if (!nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct))
  74                         ret = __nf_conntrack_confirm(pskb);
  75                 nf_ct_deliver_cached_events(ct);
  76         }
  77         return ret;
  78 }
  79
  80 extern void __nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb);
  81
  82 int
  83 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
  84             struct nf_conntrack_l3proto *l3proto,
  85             struct nf_conntrack_l4proto *proto);
  86
  87 extern struct hlist_head *nf_conntrack_hash;
  88 extern struct list_head nf_conntrack_expect_list;
  89 extern rwlock_t nf_conntrack_lock ;
  90 extern struct hlist_head unconfirmed;
  91
  92 #endif /* _NF_CONNTRACK_CORE_H */