From d635711daa98be86d4c7fd01499c34f566b54ccb Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Fri, 10 Jun 2016 05:30:17 -0300
Subject: Linux-libre 4.6.2-gnu

---
 net/sched/act_mirred.c | 72 +++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 60 insertions(+), 12 deletions(-)

(limited to 'net/sched/act_mirred.c')

diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index 32fcdecdb..8f3948dd3 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -50,15 +50,18 @@ static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = {
 	[TCA_MIRRED_PARMS]	= { .len = sizeof(struct tc_mirred) },
 };
 
+static int mirred_net_id;
+
 static int tcf_mirred_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, mirred_net_id);
 	struct nlattr *tb[TCA_MIRRED_MAX + 1];
 	struct tc_mirred *parm;
 	struct tcf_mirred *m;
 	struct net_device *dev;
-	int ret, ok_push = 0;
+	int ret, ok_push = 0, exists = 0;
 
 	if (nla == NULL)
 		return -EINVAL;
@@ -68,17 +71,27 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 	if (tb[TCA_MIRRED_PARMS] == NULL)
 		return -EINVAL;
 	parm = nla_data(tb[TCA_MIRRED_PARMS]);
+
+	exists = tcf_hash_check(tn, parm->index, a, bind);
+	if (exists && bind)
+		return 0;
+
 	switch (parm->eaction) {
 	case TCA_EGRESS_MIRROR:
 	case TCA_EGRESS_REDIR:
 		break;
 	default:
+		if (exists)
+			tcf_hash_release(a, bind);
 		return -EINVAL;
 	}
 	if (parm->ifindex) {
 		dev = __dev_get_by_index(net, parm->ifindex);
-		if (dev == NULL)
+		if (dev == NULL) {
+			if (exists)
+				tcf_hash_release(a, bind);
 			return -ENODEV;
+		}
 		switch (dev->type) {
 		case ARPHRD_TUNNEL:
 		case ARPHRD_TUNNEL6:
@@ -96,18 +109,15 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 		dev = NULL;
 	}
 
-	if (!tcf_hash_check(parm->index, a, bind)) {
+	if (!exists) {
 		if (dev == NULL)
 			return -EINVAL;
-		ret = tcf_hash_create(parm->index, est, a, sizeof(*m),
-				      bind, true);
+		ret = tcf_hash_create(tn, parm->index, est, a,
+				      sizeof(*m), bind, true);
 		if (ret)
 			return ret;
 		ret = ACT_P_CREATED;
 	} else {
-		if (bind)
-			return 0;
-
 		tcf_hash_release(a, bind);
 		if (!ovr)
 			return -EEXIST;
@@ -130,7 +140,7 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 		spin_lock_bh(&mirred_list_lock);
 		list_add(&m->tcfm_list, &mirred_list);
 		spin_unlock_bh(&mirred_list_lock);
-		tcf_hash_insert(a);
+		tcf_hash_insert(tn, a);
 	}
 
 	return ret;
@@ -179,7 +189,6 @@ static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a,
 
 	skb2->skb_iif = skb->dev->ifindex;
 	skb2->dev = dev;
-	skb_sender_cpu_clear(skb2);
 	err = dev_queue_xmit(skb2);
 
 	if (err) {
@@ -221,6 +230,22 @@ nla_put_failure:
 	return -1;
 }
 
+static int tcf_mirred_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, mirred_net_id);
+
+	return tcf_generic_walker(tn, skb, cb, type, a);
+}
+
+static int tcf_mirred_search(struct net *net, struct tc_action *a, u32 index)
+{
+	struct tc_action_net *tn = net_generic(net, mirred_net_id);
+
+	return tcf_hash_search(tn, a, index);
+}
+
 static int mirred_device_event(struct notifier_block *unused,
 			       unsigned long event, void *ptr)
 {
@@ -257,6 +282,29 @@ static struct tc_action_ops act_mirred_ops = {
 	.dump		=	tcf_mirred_dump,
 	.cleanup	=	tcf_mirred_release,
 	.init		=	tcf_mirred_init,
+	.walk		=	tcf_mirred_walker,
+	.lookup		=	tcf_mirred_search,
+};
+
+static __net_init int mirred_init_net(struct net *net)
+{
+	struct tc_action_net *tn = net_generic(net, mirred_net_id);
+
+	return tc_action_net_init(tn, &act_mirred_ops, MIRRED_TAB_MASK);
+}
+
+static void __net_exit mirred_exit_net(struct net *net)
+{
+	struct tc_action_net *tn = net_generic(net, mirred_net_id);
+
+	tc_action_net_exit(tn);
+}
+
+static struct pernet_operations mirred_net_ops = {
+	.init = mirred_init_net,
+	.exit = mirred_exit_net,
+	.id   = &mirred_net_id,
+	.size = sizeof(struct tc_action_net),
 };
 
 MODULE_AUTHOR("Jamal Hadi Salim(2002)");
@@ -270,12 +318,12 @@ static int __init mirred_init_module(void)
 		return err;
 
 	pr_info("Mirror/redirect action on\n");
-	return tcf_register_action(&act_mirred_ops, MIRRED_TAB_MASK);
+	return tcf_register_action(&act_mirred_ops, &mirred_net_ops);
 }
 
 static void __exit mirred_cleanup_module(void)
 {
-	tcf_unregister_action(&act_mirred_ops);
+	tcf_unregister_action(&act_mirred_ops, &mirred_net_ops);
 	unregister_netdevice_notifier(&mirred_device_notifier);
 }
 
-- 
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