net_sched: add network namespace support for tc actions

Currently tc actions are stored in a per-module hashtable,
therefore are visible to all network namespaces. This is
probably the last part of the tc subsystem which is not
aware of netns now. This patch makes them per-netns,
several tc action API's need to be adjusted for this.

The tc action API code is ugly due to historical reasons,
we need to refactor that code in the future.

Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 48 insertions, 6 deletions

diff --git a/net/sched/act_nat.c b/net/sched/act_nat.c
index 27607b863aba..0f65cdfbfb1d 100644
--- a/net/sched/act_nat.c
+++ b/net/sched/act_nat.c
@@ -31,6 +31,8 @@
 
 #define NAT_TAB_MASK	15
 
+static int nat_net_id;
+
 static const struct nla_policy nat_policy[TCA_NAT_MAX + 1] = {
 	[TCA_NAT_PARMS]	= { .len = sizeof(struct tc_nat) },
 };
@@ -38,6 +40,7 @@ static const struct nla_policy nat_policy[TCA_NAT_MAX + 1] = {
 static int tcf_nat_init(struct net *net, struct nlattr *nla, struct nlattr *est,
 			struct tc_action *a, int ovr, int bind)
 {
+	struct tc_action_net *tn = net_generic(net, nat_net_id);
 	struct nlattr *tb[TCA_NAT_MAX + 1];
 	struct tc_nat *parm;
 	int ret = 0, err;
@@ -54,9 +57,9 @@ static int tcf_nat_init(struct net *net, struct nlattr *nla, struct nlattr *est,
 		return -EINVAL;
 	parm = nla_data(tb[TCA_NAT_PARMS]);
 
-	if (!tcf_hash_check(parm->index, a, bind)) {
-		ret = tcf_hash_create(parm->index, est, a, sizeof(*p),
-				      bind, false);
+	if (!tcf_hash_check(tn, parm->index, a, bind)) {
+		ret = tcf_hash_create(tn, parm->index, est, a,
+				      sizeof(*p), bind, false);
 		if (ret)
 			return ret;
 		ret = ACT_P_CREATED;
@@ -79,7 +82,7 @@ static int tcf_nat_init(struct net *net, struct nlattr *nla, struct nlattr *est,
 	spin_unlock_bh(&p->tcf_lock);
 
 	if (ret == ACT_P_CREATED)
-		tcf_hash_insert(a);
+		tcf_hash_insert(tn, a);
 
 	return ret;
 }
@@ -274,6 +277,22 @@ nla_put_failure:
 	return -1;
 }
 
+static int tcf_nat_walker(struct net *net, struct sk_buff *skb,
+			  struct netlink_callback *cb, int type,
+			  struct tc_action *a)
+{
+	struct tc_action_net *tn = net_generic(net, nat_net_id);
+
+	return tcf_generic_walker(tn, skb, cb, type, a);
+}
+
+static int tcf_nat_search(struct net *net, struct tc_action *a, u32 index)
+{
+	struct tc_action_net *tn = net_generic(net, nat_net_id);
+
+	return tcf_hash_search(tn, a, index);
+}
+
 static struct tc_action_ops act_nat_ops = {
 	.kind		=	"nat",
 	.type		=	TCA_ACT_NAT,
@@ -281,6 +300,29 @@ static struct tc_action_ops act_nat_ops = {
 	.act		=	tcf_nat,
 	.dump		=	tcf_nat_dump,
 	.init		=	tcf_nat_init,
+	.walk		=	tcf_nat_walker,
+	.lookup		=	tcf_nat_search,
+};
+
+static __net_init int nat_init_net(struct net *net)
+{
+	struct tc_action_net *tn = net_generic(net, nat_net_id);
+
+	return tc_action_net_init(tn, &act_nat_ops, NAT_TAB_MASK);
+}
+
+static void __net_exit nat_exit_net(struct net *net)
+{
+	struct tc_action_net *tn = net_generic(net, nat_net_id);
+
+	tc_action_net_exit(tn);
+}
+
+static struct pernet_operations nat_net_ops = {
+	.init = nat_init_net,
+	.exit = nat_exit_net,
+	.id   = &nat_net_id,
+	.size = sizeof(struct tc_action_net),
 };
 
 MODULE_DESCRIPTION("Stateless NAT actions");
@@ -288,12 +330,12 @@ MODULE_LICENSE("GPL");
 
 static int __init nat_init_module(void)
 {
-	return tcf_register_action(&act_nat_ops, NAT_TAB_MASK);
+	return tcf_register_action(&act_nat_ops, &nat_net_ops);
 }
 
 static void __exit nat_cleanup_module(void)
 {
-	tcf_unregister_action(&act_nat_ops);
+	tcf_unregister_action(&act_nat_ops, &nat_net_ops);
 }
 
 module_init(nat_init_module);