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netfilter: hashlimit: do not use indirect calls during gc

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no need, just use a simple boolean to indicate we want to reap all
entries.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2020-01-07 12:25:10 +01:00 committed by Pablo Neira Ayuso
parent f698fe4082
commit 28b3a4270c
1 changed files with 4 additions and 18 deletions
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22
net/netfilter/xt_hashlimit.c
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@ -357,21 +357,7 @@ static int htable_create(struct net *net, struct hashlimit_cfg3 *cfg,
return 0;
}
static bool select_all(const struct xt_hashlimit_htable *ht,
const struct dsthash_ent *he)
{
return true;
}
static bool select_gc(const struct xt_hashlimit_htable *ht,
const struct dsthash_ent *he)
{
return time_after_eq(jiffies, he->expires);
}
static void htable_selective_cleanup(struct xt_hashlimit_htable *ht,
bool (*select)(const struct xt_hashlimit_htable *ht,
const struct dsthash_ent *he))
static void htable_selective_cleanup(struct xt_hashlimit_htable *ht, bool select_all)
{
unsigned int i;
@ -381,7 +367,7 @@ static void htable_selective_cleanup(struct xt_hashlimit_htable *ht,
spin_lock_bh(&ht->lock);
hlist_for_each_entry_safe(dh, n, &ht->hash[i], node) {
if ((*select)(ht, dh))
if (time_after_eq(jiffies, dh->expires) || select_all)
dsthash_free(ht, dh);
}
spin_unlock_bh(&ht->lock);
@ -395,7 +381,7 @@ static void htable_gc(struct work_struct *work)
ht = container_of(work, struct xt_hashlimit_htable, gc_work.work);
htable_selective_cleanup(ht, select_gc);
htable_selective_cleanup(ht, false);
queue_delayed_work(system_power_efficient_wq,
&ht->gc_work, msecs_to_jiffies(ht->cfg.gc_interval));
@ -419,7 +405,7 @@ static void htable_destroy(struct xt_hashlimit_htable *hinfo)
{
cancel_delayed_work_sync(&hinfo->gc_work);
htable_remove_proc_entry(hinfo);
htable_selective_cleanup(hinfo, select_all);
htable_selective_cleanup(hinfo, true);
kfree(hinfo->name);
vfree(hinfo);
}