cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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nf_hooks_lwtunnel.c (1231B)

      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
      7static 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
     15static 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
     28int 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}
     52EXPORT_SYMBOL_GPL(nf_hooks_lwtunnel_sysctl_handler);
     53#endif /* CONFIG_SYSCTL */