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[NETFILTER]: nf_conntrack: use RCU for conntrack hash

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Signed-off-by: Patrick McHardy <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Patrick McHardy 2008-01-31 04:38:38 -08:00 • committed by David S. Miller
commit 76507f69c4
6 changed files with 73 additions and 43 deletions
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18
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
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@ -39,12 +39,14 @@ struct ct_iter_state {
static struct hlist_node *ct_get_first(struct seq_file *seq)
{
struct ct_iter_state *st = seq->private;
struct hlist_node *n;
for (st->bucket = 0;
st->bucket < nf_conntrack_htable_size;
st->bucket++) {
if (!hlist_empty(&nf_conntrack_hash[st->bucket]))
return nf_conntrack_hash[st->bucket].first;
n = rcu_dereference(nf_conntrack_hash[st->bucket].first);
if (n)
return n;
}
return NULL;
}
@ -54,11 +56,11 @@ static struct hlist_node *ct_get_next(struct seq_file *seq,
{
struct ct_iter_state *st = seq->private;
head = head->next;
head = rcu_dereference(head->next);
while (head == NULL) {
if (++st->bucket >= nf_conntrack_htable_size)
return NULL;
head = nf_conntrack_hash[st->bucket].first;
head = rcu_dereference(nf_conntrack_hash[st->bucket].first);
}
return head;
}
@ -74,8 +76,9 @@ static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos)
}
static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(RCU)
{
read_lock_bh(&nf_conntrack_lock);
rcu_read_lock();
return ct_get_idx(seq, *pos);
}
@ -86,8 +89,9 @@ static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
}
static void ct_seq_stop(struct seq_file *s, void *v)
__releases(RCU)
{
read_unlock_bh(&nf_conntrack_lock);
rcu_read_unlock();
}
static int ct_seq_show(struct seq_file *s, void *v)
@ -226,6 +230,7 @@ static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
}
static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(RCU)
{
rcu_read_lock();
return ct_expect_get_idx(seq, *pos);
@ -238,6 +243,7 @@ static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
}
static void exp_seq_stop(struct seq_file *seq, void *v)
__releases(RCU)
{
rcu_read_unlock();
}