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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 extern unsigned int nf_conntrack_in(struct net *net,
 24                                     u_int8_t pf,
 25                                     unsigned int hooknum,
 26                                     struct sk_buff *skb);
 27 
 28 extern int nf_conntrack_init(struct net *net);
 29 extern void nf_conntrack_cleanup(struct net *net);
 30 
 31 extern int nf_conntrack_proto_init(void);
 32 extern void nf_conntrack_proto_fini(void);
 33 
 34 extern bool
 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_l4proto *l4proto);
 43 
 44 extern bool
 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_l4proto *l4proto);
 49 
 50 /* Find a connection corresponding to a tuple. */
 51 extern struct nf_conntrack_tuple_hash *
 52 nf_conntrack_find_get(struct net *net, const struct nf_conntrack_tuple *tuple);
 53 
 54 extern int __nf_conntrack_confirm(struct sk_buff *skb);
 55 
 56 /* Confirm a connection: returns NF_DROP if packet must be dropped. */
 57 static inline int nf_conntrack_confirm(struct sk_buff *skb)
 58 {
 59         struct nf_conn *ct = (struct nf_conn *)skb->nfct;
 60         int ret = NF_ACCEPT;
 61 
 62         if (ct && ct != &nf_conntrack_untracked) {
 63                 if (!nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct))
 64                         ret = __nf_conntrack_confirm(skb);
 65                 if (likely(ret == NF_ACCEPT))
 66                         nf_ct_deliver_cached_events(ct);
 67         }
 68         return ret;
 69 }
 70 
 71 int
 72 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
 73             const struct nf_conntrack_l3proto *l3proto,
 74             const struct nf_conntrack_l4proto *proto);
 75 
 76 extern spinlock_t nf_conntrack_lock ;
 77 
 78 #endif /* _NF_CONNTRACK_CORE_H */
 79 

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