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7a3f5b0d RS |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | ||
3 | #include <linux/sysctl.h> | |
4 | #include <net/lwtunnel.h> | |
5 | #include <net/netfilter/nf_hooks_lwtunnel.h> | |
6 | ||
7 | static inline int nf_hooks_lwtunnel_get(void) | |
8 | { | |
9 | if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled)) | |
10 | return 1; | |
11 | else | |
12 | return 0; | |
13 | } | |
14 | ||
15 | static inline int nf_hooks_lwtunnel_set(int enable) | |
16 | { | |
17 | if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled)) { | |
18 | if (!enable) | |
19 | return -EBUSY; | |
20 | } else if (enable) { | |
21 | static_branch_enable(&nf_hooks_lwtunnel_enabled); | |
22 | } | |
23 | ||
24 | return 0; | |
25 | } | |
26 | ||
27 | #ifdef CONFIG_SYSCTL | |
28 | int nf_hooks_lwtunnel_sysctl_handler(struct ctl_table *table, int write, | |
29 | void *buffer, size_t *lenp, loff_t *ppos) | |
30 | { | |
31 | int proc_nf_hooks_lwtunnel_enabled = 0; | |
32 | struct ctl_table tmp = { | |
33 | .procname = table->procname, | |
34 | .data = &proc_nf_hooks_lwtunnel_enabled, | |
35 | .maxlen = sizeof(int), | |
36 | .mode = table->mode, | |
37 | .extra1 = SYSCTL_ZERO, | |
38 | .extra2 = SYSCTL_ONE, | |
39 | }; | |
40 | int ret; | |
41 | ||
42 | if (!write) | |
43 | proc_nf_hooks_lwtunnel_enabled = nf_hooks_lwtunnel_get(); | |
44 | ||
45 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
46 | ||
47 | if (write && ret == 0) | |
48 | ret = nf_hooks_lwtunnel_set(proc_nf_hooks_lwtunnel_enabled); | |
49 | ||
50 | return ret; | |
51 | } | |
52 | EXPORT_SYMBOL_GPL(nf_hooks_lwtunnel_sysctl_handler); | |
53 | #endif /* CONFIG_SYSCTL */ |