1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * This header is used to share core functionality between the
4 * standalone connection tracking module, and the compatibility layer's use
5 * of connection tracking.
6 *
7 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
8 * - generalize L3 protocol dependent part.
9 *
10 * Derived from include/linux/netfiter_ipv4/ip_conntrack_core.h
11 */
12
13 #ifndef _NF_CONNTRACK_CORE_H
14 #define _NF_CONNTRACK_CORE_H
15
16 #include <linux/netfilter.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 sk_buff *skb, const struct nf_hook_state *state);
24
25 int nf_conntrack_init_net(struct net *net);
26 void nf_conntrack_cleanup_net(struct net *net);
27 void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list);
28
29 int nf_conntrack_proto_pernet_init(struct net *net);
30 void nf_conntrack_proto_pernet_fini(struct net *net);
31
32 int nf_conntrack_proto_init(void);
33 void nf_conntrack_proto_fini(void);
34
35 int nf_conntrack_init_start(void);
36 void nf_conntrack_cleanup_start(void);
37
38 void nf_conntrack_init_end(void);
39 void nf_conntrack_cleanup_end(void);
40
41 bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
42 const struct nf_conntrack_tuple *orig,
43 const struct nf_conntrack_l4proto *l4proto);
44
45 /* Find a connection corresponding to a tuple. */
46 struct nf_conntrack_tuple_hash *
47 nf_conntrack_find_get(struct net *net,
48 const struct nf_conntrack_zone *zone,
49 const struct nf_conntrack_tuple *tuple);
50
51 int __nf_conntrack_confirm(struct sk_buff *skb);
52
53 /* Confirm a connection: returns NF_DROP if packet must be dropped. */
54 static inline int nf_conntrack_confirm(struct sk_buff *skb)
55 {
56 struct nf_conn *ct = (struct nf_conn *)skb_nfct(skb);
57 int ret = NF_ACCEPT;
58
59 if (ct) {
60 if (!nf_ct_is_confirmed(ct))
61 ret = __nf_conntrack_confirm(skb);
62 if (likely(ret == NF_ACCEPT))
63 nf_ct_deliver_cached_events(ct);
64 }
65 return ret;
66 }
67
68 void print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
69 const struct nf_conntrack_l4proto *proto);
70
71 #define CONNTRACK_LOCKS 1024
72
73 extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];
74 void nf_conntrack_lock(spinlock_t *lock);
75
76 extern spinlock_t nf_conntrack_expect_lock;
77
78 #endif /* _NF_CONNTRACK_CORE_H */
79
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