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Linux/include/net/netfilter/nf_conntrack_core.h

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  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 nf_conntrack_tuple *tuple,
 45                      const struct nf_conntrack_l3proto *l3proto,
 46                      const struct nf_conntrack_l4proto *l4proto);
 47 
 48 bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
 49                         const struct nf_conntrack_tuple *orig,
 50                         const struct nf_conntrack_l3proto *l3proto,
 51                         const struct nf_conntrack_l4proto *l4proto);
 52 
 53 /* Find a connection corresponding to a tuple. */
 54 struct nf_conntrack_tuple_hash *
 55 nf_conntrack_find_get(struct net *net, u16 zone,
 56                       const struct nf_conntrack_tuple *tuple);
 57 
 58 int __nf_conntrack_confirm(struct sk_buff *skb);
 59 
 60 /* Confirm a connection: returns NF_DROP if packet must be dropped. */
 61 static inline int nf_conntrack_confirm(struct sk_buff *skb)
 62 {
 63         struct nf_conn *ct = (struct nf_conn *)skb->nfct;
 64         int ret = NF_ACCEPT;
 65 
 66         if (ct && !nf_ct_is_untracked(ct)) {
 67                 if (!nf_ct_is_confirmed(ct))
 68                         ret = __nf_conntrack_confirm(skb);
 69                 if (likely(ret == NF_ACCEPT))
 70                         nf_ct_deliver_cached_events(ct);
 71         }
 72         return ret;
 73 }
 74 
 75 int
 76 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
 77             const struct nf_conntrack_l3proto *l3proto,
 78             const struct nf_conntrack_l4proto *proto);
 79 
 80 #ifdef CONFIG_LOCKDEP
 81 # define CONNTRACK_LOCKS 8
 82 #else
 83 # define CONNTRACK_LOCKS 1024
 84 #endif
 85 extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];
 86 
 87 extern spinlock_t nf_conntrack_expect_lock;
 88 
 89 #endif /* _NF_CONNTRACK_CORE_H */
 90 

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