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 unsigned int nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
  24                              struct sk_buff *skb);
  25
  26 int nf_conntrack_init_net(struct net *net);
  27 void nf_conntrack_cleanup_net(struct net *net);
  28 void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list);
  29
  30 int nf_conntrack_proto_pernet_init(struct net *net);
  31 void nf_conntrack_proto_pernet_fini(struct net *net);
  32
  33 int nf_conntrack_proto_init(void);
  34 void nf_conntrack_proto_fini(void);
  35
  36 int nf_conntrack_init_start(void);
  37 void nf_conntrack_cleanup_start(void);
  38
  39 void nf_conntrack_init_end(void);
  40 void nf_conntrack_cleanup_end(void);
  41
  42 bool nf_ct_get_tuple(const struct sk_buff *skb, unsigned int nhoff,
  43                      unsigned int dataoff, u_int16_t l3num, u_int8_t protonum,
  44                      struct net *net,
  45                      struct nf_conntrack_tuple *tuple,
  46                      const struct nf_conntrack_l3proto *l3proto,
  47                      const struct nf_conntrack_l4proto *l4proto);
  48
  49 bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
  50                         const struct nf_conntrack_tuple *orig,
  51                         const struct nf_conntrack_l3proto *l3proto,
  52                         const struct nf_conntrack_l4proto *l4proto);
  53
  54 void nf_conntrack_get_ht(struct hlist_nulls_head **hash, unsigned int *hsize);
  55
  56 /* Find a connection corresponding to a tuple. */
  57 struct nf_conntrack_tuple_hash *
  58 nf_conntrack_find_get(struct net *net,
  59                       const struct nf_conntrack_zone *zone,
  60                       const struct nf_conntrack_tuple *tuple);
  61
  62 int __nf_conntrack_confirm(struct sk_buff *skb);
  63
  64 /* Confirm a connection: returns NF_DROP if packet must be dropped. */
  65 static inline int nf_conntrack_confirm(struct sk_buff *skb)
  66 {
  67         struct nf_conn *ct = (struct nf_conn *)skb->nfct;
  68         int ret = NF_ACCEPT;
  69
  70         if (ct && !nf_ct_is_untracked(ct)) {
  71                 if (!nf_ct_is_confirmed(ct))
  72                         ret = __nf_conntrack_confirm(skb);
  73                 if (likely(ret == NF_ACCEPT))
  74                         nf_ct_deliver_cached_events(ct);
  75         }
  76         return ret;
  77 }
  78
  79 void
  80 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
  81             const struct nf_conntrack_l3proto *l3proto,
  82             const struct nf_conntrack_l4proto *proto);
  83
  84 #define CONNTRACK_LOCKS 1024
  85
  86 extern struct hlist_nulls_head *nf_conntrack_hash;
  87 extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];
  88 void nf_conntrack_lock(spinlock_t *lock);
  89
  90 extern spinlock_t nf_conntrack_expect_lock;
  91
  92 #endif /* _NF_CONNTRACK_CORE_H */