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
nf_hooks_lwtunnel_get(void)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
nf_hooks_lwtunnel_set(int enable)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
nf_hooks_lwtunnel_sysctl_handler(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)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 */
54