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. */
23unsigned int nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
24			     struct sk_buff *skb);
25
26int nf_conntrack_init_net(struct net *net);
27void nf_conntrack_cleanup_net(struct net *net);
28void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list);
29
30int nf_conntrack_proto_pernet_init(struct net *net);
31void nf_conntrack_proto_pernet_fini(struct net *net);
32
33int nf_conntrack_proto_init(void);
34void nf_conntrack_proto_fini(void);
35
36int nf_conntrack_init_start(void);
37void nf_conntrack_cleanup_start(void);
38
39void nf_conntrack_init_end(void);
40void nf_conntrack_cleanup_end(void);
41
42bool 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
48bool 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. */
54struct nf_conntrack_tuple_hash *
55nf_conntrack_find_get(struct net *net, u16 zone,
56		      const struct nf_conntrack_tuple *tuple);
57
58int __nf_conntrack_confirm(struct sk_buff *skb);
59
60/* Confirm a connection: returns NF_DROP if packet must be dropped. */
61static 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
75int
76print_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
85extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];
86
87extern spinlock_t nf_conntrack_expect_lock;
88
89#endif /* _NF_CONNTRACK_CORE_H */
90