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 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_invert_tuple(struct nf_conntrack_tuple *inverse,
43 const struct nf_conntrack_tuple *orig,
44 const struct nf_conntrack_l4proto *l4proto);
45
46 /* Find a connection corresponding to a tuple. */
47 struct nf_conntrack_tuple_hash *
48 nf_conntrack_find_get(struct net *net,
49 const struct nf_conntrack_zone *zone,
50 const struct nf_conntrack_tuple *tuple);
51
52 int __nf_conntrack_confirm(struct sk_buff *skb);
53
54 /* Confirm a connection: returns NF_DROP if packet must be dropped. */
nf_conntrack_confirm(struct sk_buff * skb)55 static inline int nf_conntrack_confirm(struct sk_buff *skb)
56 {
57 struct nf_conn *ct = (struct nf_conn *)skb_nfct(skb);
58 int ret = NF_ACCEPT;
59
60 if (ct) {
61 if (!nf_ct_is_confirmed(ct))
62 ret = __nf_conntrack_confirm(skb);
63 if (likely(ret == NF_ACCEPT))
64 nf_ct_deliver_cached_events(ct);
65 }
66 return ret;
67 }
68
69 void print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
70 const struct nf_conntrack_l4proto *proto);
71
72 #define CONNTRACK_LOCKS 1024
73
74 extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];
75 void nf_conntrack_lock(spinlock_t *lock);
76
77 extern spinlock_t nf_conntrack_expect_lock;
78
79 #endif /* _NF_CONNTRACK_CORE_H */
80
