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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