netfilter: ipt_CLUSTERIP: make clusterip_list per net namespace

clusterip_configs should be per net namespace, so operate
cluster in one net namespace won't affect other net
namespace. right now, only allow to operate the clusterip_configs
of init net namespace.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/ipv4/netfilter/ipt_CLUSTERIP.c b/net/ipv4/netfilter/ipt_CLUSTERIP.c
index e66b91b9284327b131dfdeec54564e565635bcbe..8ef3e6f38635f420a71152fb091f3c7b49a700a4 100644 (file)
--- a/net/ipv4/netfilter/ipt_CLUSTERIP.c
+++ b/net/ipv4/netfilter/ipt_CLUSTERIP.c
@@ -58,8 +58,6 @@ struct clusterip_config {
        struct rcu_head rcu;
 };
 
-static LIST_HEAD(clusterip_configs);
-
 /* clusterip_lock protects the clusterip_configs list */
 static DEFINE_SPINLOCK(clusterip_lock);
 
@@ -70,6 +68,7 @@ static const struct file_operations clusterip_proc_fops;
 static int clusterip_net_id __read_mostly;
 
 struct clusterip_net {
+       struct list_head configs;
 #ifdef CONFIG_PROC_FS
        struct proc_dir_entry *procdir;
 #endif
@@ -124,8 +123,9 @@ static struct clusterip_config *
 __clusterip_config_find(__be32 clusterip)
 {
        struct clusterip_config *c;
+       struct clusterip_net *cn = net_generic(&init_net, clusterip_net_id);
 
-       list_for_each_entry_rcu(c, &clusterip_configs, list) {
+       list_for_each_entry_rcu(c, &cn->configs, list) {
                if (c->clusterip == clusterip)
                        return c;
        }
@@ -199,7 +199,7 @@ clusterip_config_init(const struct ipt_clusterip_tgt_info *i, __be32 ip,
 #endif
 
        spin_lock_bh(&clusterip_lock);
-       list_add_rcu(&c->list, &clusterip_configs);
+       list_add_rcu(&c->list, &cn->configs);
        spin_unlock_bh(&clusterip_lock);
 
        return c;
@@ -709,9 +709,11 @@ static const struct file_operations clusterip_proc_fops = {
 
 static int clusterip_net_init(struct net *net)
 {
-#ifdef CONFIG_PROC_FS
        struct clusterip_net *cn = net_generic(net, clusterip_net_id);
 
+       INIT_LIST_HEAD(&cn->configs);
+
+#ifdef CONFIG_PROC_FS
        cn->procdir = proc_mkdir("ipt_CLUSTERIP", net->proc_net);
        if (!cn->procdir) {
                pr_err("Unable to proc dir entry\n");