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netfilter: add nf_static_key_{inc,dec}

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Add helper functions increment and decrement the hook static keys.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2020-10-08 01:14:45 +02:00
parent 073b04e76b
commit afd9024cd1
1 changed files with 17 additions and 6 deletions
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23
net/netfilter/core.c
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@ -311,6 +311,20 @@ nf_hook_entry_head(struct net *net, int pf, unsigned int hooknum,
return NULL;
}
static void nf_static_key_inc(const struct nf_hook_ops *reg, int pf)
{
#ifdef CONFIG_JUMP_LABEL
static_key_slow_inc(&nf_hooks_needed[pf][reg->hooknum]);
#endif
}
static void nf_static_key_dec(const struct nf_hook_ops *reg, int pf)
{
#ifdef CONFIG_JUMP_LABEL
static_key_slow_dec(&nf_hooks_needed[pf][reg->hooknum]);
#endif
}
static int __nf_register_net_hook(struct net *net, int pf,
const struct nf_hook_ops *reg)
{
@ -348,9 +362,8 @@ static int __nf_register_net_hook(struct net *net, int pf,
if (pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_INGRESS)
net_inc_ingress_queue();
#endif
#ifdef CONFIG_JUMP_LABEL
static_key_slow_inc(&nf_hooks_needed[pf][reg->hooknum]);
#endif
nf_static_key_inc(reg, pf);
BUG_ON(p == new_hooks);
nf_hook_entries_free(p);
return 0;
@ -406,9 +419,7 @@ static void __nf_unregister_net_hook(struct net *net, int pf,
if (pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_INGRESS)
net_dec_ingress_queue();
#endif
#ifdef CONFIG_JUMP_LABEL
static_key_slow_dec(&nf_hooks_needed[pf][reg->hooknum]);
#endif
nf_static_key_dec(reg, pf);
} else {
WARN_ONCE(1, "hook not found, pf %d num %d", pf, reg->hooknum);
}