From: Gao feng <gaofeng@xxxxxxxxxxxxxx>
this lock is used for protecting clusterip_configs of per
net namespace, it should be per net namespace too.
Signed-off-by: Gao feng <gaofeng@xxxxxxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
net/ipv4/netfilter/ipt_CLUSTERIP.c | 18 +++++++++++-------
1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/net/ipv4/netfilter/ipt_CLUSTERIP.c b/net/ipv4/netfilter/ipt_CLUSTERIP.c
index 8ef3e6f..1bf5aa30 100644
--- a/net/ipv4/netfilter/ipt_CLUSTERIP.c
+++ b/net/ipv4/netfilter/ipt_CLUSTERIP.c
@@ -58,9 +58,6 @@ struct clusterip_config {
struct rcu_head rcu;
};
-/* clusterip_lock protects the clusterip_configs list */
-static DEFINE_SPINLOCK(clusterip_lock);
-
#ifdef CONFIG_PROC_FS
static const struct file_operations clusterip_proc_fops;
#endif
@@ -69,6 +66,9 @@ static int clusterip_net_id __read_mostly;
struct clusterip_net {
struct list_head configs;
+ /* lock protects the configs list */
+ spinlock_t lock;
+
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *procdir;
#endif
@@ -99,10 +99,12 @@ clusterip_config_put(struct clusterip_config *c)
static inline void
clusterip_config_entry_put(struct clusterip_config *c)
{
+ struct clusterip_net *cn = net_generic(&init_net, clusterip_net_id);
+
local_bh_disable();
- if (atomic_dec_and_lock(&c->entries, &clusterip_lock)) {
+ if (atomic_dec_and_lock(&c->entries, &cn->lock)) {
list_del_rcu(&c->list);
- spin_unlock(&clusterip_lock);
+ spin_unlock(&cn->lock);
local_bh_enable();
dev_mc_del(c->dev, c->clustermac);
@@ -198,9 +200,9 @@ clusterip_config_init(const struct ipt_clusterip_tgt_info *i, __be32 ip,
}
#endif
- spin_lock_bh(&clusterip_lock);
+ spin_lock_bh(&cn->lock);
list_add_rcu(&c->list, &cn->configs);
- spin_unlock_bh(&clusterip_lock);
+ spin_unlock_bh(&cn->lock);
return c;
}
@@ -713,6 +715,8 @@ static int clusterip_net_init(struct net *net)
INIT_LIST_HEAD(&cn->configs);
+ spin_lock_init(&cn->lock);
+
#ifdef CONFIG_PROC_FS
cn->procdir = proc_mkdir("ipt_CLUSTERIP", net->proc_net);
if (!cn->procdir) {
--
1.7.10.4
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