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.h> |
18 | #include <net/netfilter/nf_conntrack_ecache.h> |
19 | #include <net/netfilter/nf_conntrack_l4proto.h> |
20 | |
21 | /* This header is used to share core functionality between the |
22 | standalone connection tracking module, and the compatibility layer's use |
23 | of connection tracking. */ |
24 | |
25 | unsigned int nf_conntrack_in(struct sk_buff *skb, |
26 | const struct nf_hook_state *state); |
27 | |
28 | int nf_conntrack_init_net(struct net *net); |
29 | void nf_conntrack_cleanup_net(struct net *net); |
30 | void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list); |
31 | |
32 | void nf_conntrack_proto_pernet_init(struct net *net); |
33 | |
34 | int nf_conntrack_proto_init(void); |
35 | void nf_conntrack_proto_fini(void); |
36 | |
37 | int nf_conntrack_init_start(void); |
38 | void nf_conntrack_cleanup_start(void); |
39 | |
40 | void nf_conntrack_init_end(void); |
41 | void nf_conntrack_cleanup_end(void); |
42 | |
43 | bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
44 | const struct nf_conntrack_tuple *orig); |
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. */ |
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 | |
64 | if (ret == NF_ACCEPT) |
65 | ct = (struct nf_conn *)skb_nfct(skb); |
66 | } |
67 | |
68 | if (ret == NF_ACCEPT && nf_ct_ecache_exist(ct)) |
69 | nf_ct_deliver_cached_events(ct); |
70 | } |
71 | return ret; |
72 | } |
73 | |
74 | unsigned int nf_confirm(void *priv, struct sk_buff *skb, const struct nf_hook_state *state); |
75 | |
76 | void print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple, |
77 | const struct nf_conntrack_l4proto *proto); |
78 | |
79 | #define CONNTRACK_LOCKS 1024 |
80 | |
81 | extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS]; |
82 | void nf_conntrack_lock(spinlock_t *lock); |
83 | |
84 | extern spinlock_t nf_conntrack_expect_lock; |
85 | |
86 | /* ctnetlink code shared by both ctnetlink and nf_conntrack_bpf */ |
87 | |
88 | static inline void __nf_ct_set_timeout(struct nf_conn *ct, u64 timeout) |
89 | { |
90 | if (timeout > INT_MAX) |
91 | timeout = INT_MAX; |
92 | |
93 | if (nf_ct_is_confirmed(ct)) |
94 | WRITE_ONCE(ct->timeout, nfct_time_stamp + (u32)timeout); |
95 | else |
96 | ct->timeout = (u32)timeout; |
97 | } |
98 | |
99 | int __nf_ct_change_timeout(struct nf_conn *ct, u64 cta_timeout); |
100 | void __nf_ct_change_status(struct nf_conn *ct, unsigned long on, unsigned long off); |
101 | int nf_ct_change_status_common(struct nf_conn *ct, unsigned int status); |
102 | |
103 | #endif /* _NF_CONNTRACK_CORE_H */ |
104 | |