net_sched: move the empty tp check from ->destroy() to ->delete()

We could have a race condition where in ->classify() path we
dereference tp->root and meanwhile a parallel ->destroy() makes it
a NULL. Daniel cured this bug in commit d936377414fa
("net, sched: respect rcu grace period on cls destruction").

This happens when ->destroy() is called for deleting a filter to
check if we are the last one in tp, this tp is still linked and
visible at that time. The root cause of this problem is the semantic
of ->destroy(), it does two things (for non-force case):

1) check if tp is empty
2) if tp is empty we could really destroy it

and its caller, if cares, needs to check its return value to see if it
is really destroyed. Therefore we can't unlink tp unless we know it is
empty.

As suggested by Daniel, we could actually move the test logic to ->delete()
so that we can safely unlink tp after ->delete() tells us the last one is
just deleted and before ->destroy().

Fixes: 1e052be69d04 ("net_sched: destroy proto tp when all filters are gone")
Cc: Roi Dayan <roid@mellanox.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

12 files changed, 132 insertions, 126 deletions

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index a8da383b681a..22f88b35a546 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -178,14 +178,11 @@ errout:
 	return ERR_PTR(err);
 }
 
-static bool tcf_proto_destroy(struct tcf_proto *tp, bool force)
+static void tcf_proto_destroy(struct tcf_proto *tp)
 {
-	if (tp->ops->destroy(tp, force)) {
-		module_put(tp->ops->owner);
-		kfree_rcu(tp, rcu);
-		return true;
-	}
-	return false;
+	tp->ops->destroy(tp);
+	module_put(tp->ops->owner);
+	kfree_rcu(tp, rcu);
 }
 
 void tcf_destroy_chain(struct tcf_proto __rcu **fl)
@@ -194,7 +191,7 @@ void tcf_destroy_chain(struct tcf_proto __rcu **fl)
 
 	while ((tp = rtnl_dereference(*fl)) != NULL) {
 		RCU_INIT_POINTER(*fl, tp->next);
-		tcf_proto_destroy(tp, true);
+		tcf_proto_destroy(tp);
 	}
 }
 EXPORT_SYMBOL(tcf_destroy_chain);
@@ -361,7 +358,7 @@ replay:
 			RCU_INIT_POINTER(*back, next);
 			tfilter_notify(net, skb, n, tp, fh,
 				       RTM_DELTFILTER, false);
-			tcf_proto_destroy(tp, true);
+			tcf_proto_destroy(tp);
 			err = 0;
 			goto errout;
 		}
@@ -372,24 +369,28 @@ replay:
 			goto errout;
 		}
 	} else {
+		bool last;
+
 		switch (n->nlmsg_type) {
 		case RTM_NEWTFILTER:
 			if (n->nlmsg_flags & NLM_F_EXCL) {
 				if (tp_created)
-					tcf_proto_destroy(tp, true);
+					tcf_proto_destroy(tp);
 				err = -EEXIST;
 				goto errout;
 			}
 			break;
 		case RTM_DELTFILTER:
-			err = tp->ops->delete(tp, fh);
+			err = tp->ops->delete(tp, fh, &last);
 			if (err)
 				goto errout;
 			next = rtnl_dereference(tp->next);
 			tfilter_notify(net, skb, n, tp, t->tcm_handle,
 				       RTM_DELTFILTER, false);
-			if (tcf_proto_destroy(tp, false))
+			if (last) {
 				RCU_INIT_POINTER(*back, next);
+				tcf_proto_destroy(tp);
+			}
 			goto errout;
 		case RTM_GETTFILTER:
 			err = tfilter_notify(net, skb, n, tp, fh,
@@ -411,7 +412,7 @@ replay:
 		tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER, false);
 	} else {
 		if (tp_created)
-			tcf_proto_destroy(tp, true);
+			tcf_proto_destroy(tp);
 	}
 
 errout:
diff --git a/net/sched/cls_basic.c b/net/sched/cls_basic.c
index 422414f16b38..c4fd63a068f9 100644
--- a/net/sched/cls_basic.c
+++ b/net/sched/cls_basic.c
@@ -93,30 +93,28 @@ static void basic_delete_filter(struct rcu_head *head)
 	kfree(f);
 }
 
-static bool basic_destroy(struct tcf_proto *tp, bool force)
+static void basic_destroy(struct tcf_proto *tp)
 {
 	struct basic_head *head = rtnl_dereference(tp->root);
 	struct basic_filter *f, *n;
 
-	if (!force && !list_empty(&head->flist))
-		return false;
-
 	list_for_each_entry_safe(f, n, &head->flist, link) {
 		list_del_rcu(&f->link);
 		tcf_unbind_filter(tp, &f->res);
 		call_rcu(&f->rcu, basic_delete_filter);
 	}
 	kfree_rcu(head, rcu);
-	return true;
 }
 
-static int basic_delete(struct tcf_proto *tp, unsigned long arg)
+static int basic_delete(struct tcf_proto *tp, unsigned long arg, bool *last)
 {
+	struct basic_head *head = rtnl_dereference(tp->root);
 	struct basic_filter *f = (struct basic_filter *) arg;
 
 	list_del_rcu(&f->link);
 	tcf_unbind_filter(tp, &f->res);
 	call_rcu(&f->rcu, basic_delete_filter);
+	*last = list_empty(&head->flist);
 	return 0;
 }
 
diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
index 7ddd08efaa0f..5ebeae996e63 100644
--- a/net/sched/cls_bpf.c
+++ b/net/sched/cls_bpf.c
@@ -274,25 +274,24 @@ static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog)
 	call_rcu(&prog->rcu, cls_bpf_delete_prog_rcu);
 }
 
-static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg)
+static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg, bool *last)
 {
+	struct cls_bpf_head *head = rtnl_dereference(tp->root);
+
 	__cls_bpf_delete(tp, (struct cls_bpf_prog *) arg);
+	*last = list_empty(&head->plist);
 	return 0;
 }
 
-static bool cls_bpf_destroy(struct tcf_proto *tp, bool force)
+static void cls_bpf_destroy(struct tcf_proto *tp)
 {
 	struct cls_bpf_head *head = rtnl_dereference(tp->root);
 	struct cls_bpf_prog *prog, *tmp;
 
-	if (!force && !list_empty(&head->plist))
-		return false;
-
 	list_for_each_entry_safe(prog, tmp, &head->plist, link)
 		__cls_bpf_delete(tp, prog);
 
 	kfree_rcu(head, rcu);
-	return true;
 }
 
 static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle)
diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index b5e7c1bee6c3..12ce547eea04 100644
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -131,20 +131,16 @@ errout:
 	return err;
 }
 
-static bool cls_cgroup_destroy(struct tcf_proto *tp, bool force)
+static void cls_cgroup_destroy(struct tcf_proto *tp)
 {
 	struct cls_cgroup_head *head = rtnl_dereference(tp->root);
 
-	if (!force)
-		return false;
 	/* Head can still be NULL due to cls_cgroup_init(). */
 	if (head)
 		call_rcu(&head->rcu, cls_cgroup_destroy_rcu);
-
-	return true;
 }
 
-static int cls_cgroup_delete(struct tcf_proto *tp, unsigned long arg)
+static int cls_cgroup_delete(struct tcf_proto *tp, unsigned long arg, bool *last)
 {
 	return -EOPNOTSUPP;
 }
diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c
index 008ba7e63b7a..3065752b9cda 100644
--- a/net/sched/cls_flow.c
+++ b/net/sched/cls_flow.c
@@ -562,12 +562,14 @@ err1:
 	return err;
 }
 
-static int flow_delete(struct tcf_proto *tp, unsigned long arg)
+static int flow_delete(struct tcf_proto *tp, unsigned long arg, bool *last)
 {
+	struct flow_head *head = rtnl_dereference(tp->root);
 	struct flow_filter *f = (struct flow_filter *)arg;
 
 	list_del_rcu(&f->list);
 	call_rcu(&f->rcu, flow_destroy_filter);
+	*last = list_empty(&head->filters);
 	return 0;
 }
 
@@ -583,20 +585,16 @@ static int flow_init(struct tcf_proto *tp)
 	return 0;
 }
 
-static bool flow_destroy(struct tcf_proto *tp, bool force)
+static void flow_destroy(struct tcf_proto *tp)
 {
 	struct flow_head *head = rtnl_dereference(tp->root);
 	struct flow_filter *f, *next;
 
-	if (!force && !list_empty(&head->filters))
-		return false;
-
 	list_for_each_entry_safe(f, next, &head->filters, list) {
 		list_del_rcu(&f->list);
 		call_rcu(&f->rcu, flow_destroy_filter);
 	}
 	kfree_rcu(head, rcu);
-	return true;
 }
 
 static unsigned long flow_get(struct tcf_proto *tp, u32 handle)
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 3e7bd7801aa8..31ee3404aeb4 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -328,21 +328,16 @@ static void fl_destroy_rcu(struct rcu_head *rcu)
 	schedule_work(&head->work);
 }
 
-static bool fl_destroy(struct tcf_proto *tp, bool force)
+static void fl_destroy(struct tcf_proto *tp)
 {
 	struct cls_fl_head *head = rtnl_dereference(tp->root);
 	struct cls_fl_filter *f, *next;
 
-	if (!force && !list_empty(&head->filters))
-		return false;
-
 	list_for_each_entry_safe(f, next, &head->filters, list)
 		__fl_delete(tp, f);
 
 	__module_get(THIS_MODULE);
 	call_rcu(&head->rcu, fl_destroy_rcu);
-
-	return true;
 }
 
 static unsigned long fl_get(struct tcf_proto *tp, u32 handle)
@@ -947,7 +942,7 @@ errout_tb:
 	return err;
 }
 
-static int fl_delete(struct tcf_proto *tp, unsigned long arg)
+static int fl_delete(struct tcf_proto *tp, unsigned long arg, bool *last)
 {
 	struct cls_fl_head *head = rtnl_dereference(tp->root);
 	struct cls_fl_filter *f = (struct cls_fl_filter *) arg;
@@ -956,6 +951,7 @@ static int fl_delete(struct tcf_proto *tp, unsigned long arg)
 		rhashtable_remove_fast(&head->ht, &f->ht_node,
 				       head->ht_params);
 	__fl_delete(tp, f);
+	*last = list_empty(&head->filters);
 	return 0;
 }
 
diff --git a/net/sched/cls_fw.c b/net/sched/cls_fw.c
index 996209083c6b..78ccb4a85a4d 100644
--- a/net/sched/cls_fw.c
+++ b/net/sched/cls_fw.c
@@ -127,20 +127,14 @@ static void fw_delete_filter(struct rcu_head *head)
 	kfree(f);
 }
 
-static bool fw_destroy(struct tcf_proto *tp, bool force)
+static void fw_destroy(struct tcf_proto *tp)
 {
 	struct fw_head *head = rtnl_dereference(tp->root);
 	struct fw_filter *f;
 	int h;
 
 	if (head == NULL)
-		return true;
-
-	if (!force) {
-		for (h = 0; h < HTSIZE; h++)
-			if (rcu_access_pointer(head->ht[h]))
-				return false;
-	}
+		return;
 
 	for (h = 0; h < HTSIZE; h++) {
 		while ((f = rtnl_dereference(head->ht[h])) != NULL) {
@@ -152,15 +146,16 @@ static bool fw_destroy(struct tcf_proto *tp, bool force)
 	}
 	RCU_INIT_POINTER(tp->root, NULL);
 	kfree_rcu(head, rcu);
-	return true;
 }
 
-static int fw_delete(struct tcf_proto *tp, unsigned long arg)
+static int fw_delete(struct tcf_proto *tp, unsigned long arg, bool *last)
 {
 	struct fw_head *head = rtnl_dereference(tp->root);
 	struct fw_filter *f = (struct fw_filter *)arg;
 	struct fw_filter __rcu **fp;
 	struct fw_filter *pfp;
+	int ret = -EINVAL;
+	int h;
 
 	if (head == NULL || f == NULL)
 		goto out;
@@ -173,11 +168,21 @@ static int fw_delete(struct tcf_proto *tp, unsigned long arg)
 			RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
 			tcf_unbind_filter(tp, &f->res);
 			call_rcu(&f->rcu, fw_delete_filter);
-			return 0;
+			ret = 0;
+			break;
 		}
 	}
+
+	*last = true;
+	for (h = 0; h < HTSIZE; h++) {
+		if (rcu_access_pointer(head->ht[h])) {
+			*last = false;
+			break;
+		}
+	}
+
 out:
-	return -EINVAL;
+	return ret;
 }
 
 static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
index 0dbcca62aa6a..2efb36c08f2a 100644
--- a/net/sched/cls_matchall.c
+++ b/net/sched/cls_matchall.c
@@ -90,19 +90,18 @@ static void mall_destroy_hw_filter(struct tcf_proto *tp,
 					     &offload);
 }
 
-static bool mall_destroy(struct tcf_proto *tp, bool force)
+static void mall_destroy(struct tcf_proto *tp)
 {
 	struct cls_mall_head *head = rtnl_dereference(tp->root);
 	struct net_device *dev = tp->q->dev_queue->dev;
 
 	if (!head)
-		return true;
+		return;
 
 	if (tc_should_offload(dev, tp, head->flags))
 		mall_destroy_hw_filter(tp, head, (unsigned long) head);
 
 	call_rcu(&head->rcu, mall_destroy_rcu);
-	return true;
 }
 
 static unsigned long mall_get(struct tcf_proto *tp, u32 handle)
@@ -216,7 +215,7 @@ err_exts_init:
 	return err;
 }
 
-static int mall_delete(struct tcf_proto *tp, unsigned long arg)
+static int mall_delete(struct tcf_proto *tp, unsigned long arg, bool *last)
 {
 	return -EOPNOTSUPP;
 }
diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c
index a371075c1d7a..f4d687e04240 100644
--- a/net/sched/cls_route.c
+++ b/net/sched/cls_route.c
@@ -276,20 +276,13 @@ static void route4_delete_filter(struct rcu_head *head)
 	kfree(f);
 }
 
-static bool route4_destroy(struct tcf_proto *tp, bool force)
+static void route4_destroy(struct tcf_proto *tp)
 {
 	struct route4_head *head = rtnl_dereference(tp->root);
 	int h1, h2;
 
 	if (head == NULL)
-		return true;
-
-	if (!force) {
-		for (h1 = 0; h1 <= 256; h1++) {
-			if (rcu_access_pointer(head->table[h1]))
-				return false;
-		}
-	}
+		return;
 
 	for (h1 = 0; h1 <= 256; h1++) {
 		struct route4_bucket *b;
@@ -314,10 +307,9 @@ static bool route4_destroy(struct tcf_proto *tp, bool force)
 	}
 	RCU_INIT_POINTER(tp->root, NULL);
 	kfree_rcu(head, rcu);
-	return true;
 }
 
-static int route4_delete(struct tcf_proto *tp, unsigned long arg)
+static int route4_delete(struct tcf_proto *tp, unsigned long arg, bool *last)
 {
 	struct route4_head *head = rtnl_dereference(tp->root);
 	struct route4_filter *f = (struct route4_filter *)arg;
@@ -325,7 +317,7 @@ static int route4_delete(struct tcf_proto *tp, unsigned long arg)
 	struct route4_filter *nf;
 	struct route4_bucket *b;
 	unsigned int h = 0;
-	int i;
+	int i, h1;
 
 	if (!head || !f)
 		return -EINVAL;
@@ -356,16 +348,25 @@ static int route4_delete(struct tcf_proto *tp, unsigned long arg)
 
 				rt = rtnl_dereference(b->ht[i]);
 				if (rt)
-					return 0;
+					goto out;
 			}
 
 			/* OK, session has no flows */
 			RCU_INIT_POINTER(head->table[to_hash(h)], NULL);
 			kfree_rcu(b, rcu);
+			break;
+		}
+	}
 
-			return 0;
+out:
+	*last = true;
+	for (h1 = 0; h1 <= 256; h1++) {
+		if (rcu_access_pointer(head->table[h1])) {
+			*last = false;
+			break;
 		}
 	}
+
 	return 0;
 }
 
diff --git a/net/sched/cls_rsvp.h b/net/sched/cls_rsvp.h
index d7f2923e6ebd..18a947016178 100644
--- a/net/sched/cls_rsvp.h
+++ b/net/sched/cls_rsvp.h
@@ -302,20 +302,13 @@ static void rsvp_delete_filter(struct tcf_proto *tp, struct rsvp_filter *f)
 	call_rcu(&f->rcu, rsvp_delete_filter_rcu);
 }
 
-static bool rsvp_destroy(struct tcf_proto *tp, bool force)
+static void rsvp_destroy(struct tcf_proto *tp)
 {
 	struct rsvp_head *data = rtnl_dereference(tp->root);
 	int h1, h2;
 
 	if (data == NULL)
-		return true;
-
-	if (!force) {
-		for (h1 = 0; h1 < 256; h1++) {
-			if (rcu_access_pointer(data->ht[h1]))
-				return false;
-		}
-	}
+		return;
 
 	RCU_INIT_POINTER(tp->root, NULL);
 
@@ -337,10 +330,9 @@ static bool rsvp_destroy(struct tcf_proto *tp, bool force)
 		}
 	}
 	kfree_rcu(data, rcu);
-	return true;
 }
 
-static int rsvp_delete(struct tcf_proto *tp, unsigned long arg)
+static int rsvp_delete(struct tcf_proto *tp, unsigned long arg, bool *last)
 {
 	struct rsvp_head *head = rtnl_dereference(tp->root);
 	struct rsvp_filter *nfp, *f = (struct rsvp_filter *)arg;
@@ -348,7 +340,7 @@ static int rsvp_delete(struct tcf_proto *tp, unsigned long arg)
 	unsigned int h = f->handle;
 	struct rsvp_session __rcu **sp;
 	struct rsvp_session *nsp, *s = f->sess;
-	int i;
+	int i, h1;
 
 	fp = &s->ht[(h >> 8) & 0xFF];
 	for (nfp = rtnl_dereference(*fp); nfp;
@@ -361,7 +353,7 @@ static int rsvp_delete(struct tcf_proto *tp, unsigned long arg)
 
 			for (i = 0; i <= 16; i++)
 				if (s->ht[i])
-					return 0;
+					goto out;
 
 			/* OK, session has no flows */
 			sp = &head->ht[h & 0xFF];
@@ -370,13 +362,23 @@ static int rsvp_delete(struct tcf_proto *tp, unsigned long arg)
 				if (nsp == s) {
 					RCU_INIT_POINTER(*sp, s->next);
 					kfree_rcu(s, rcu);
-					return 0;
+					goto out;
 				}
 			}
 
-			return 0;
+			break;
 		}
 	}
+
+out:
+	*last = true;
+	for (h1 = 0; h1 < 256; h1++) {
+		if (rcu_access_pointer(head->ht[h1])) {
+			*last = false;
+			break;
+		}
+	}
+
 	return 0;
 }
 
diff --git a/net/sched/cls_tcindex.c b/net/sched/cls_tcindex.c
index 2ab001361457..8a8a58357c39 100644
--- a/net/sched/cls_tcindex.c
+++ b/net/sched/cls_tcindex.c
@@ -150,7 +150,7 @@ static void tcindex_destroy_fexts(struct rcu_head *head)
 	kfree(f);
 }
 
-static int tcindex_delete(struct tcf_proto *tp, unsigned long arg)
+static int tcindex_delete(struct tcf_proto *tp, unsigned long arg, bool *last)
 {
 	struct tcindex_data *p = rtnl_dereference(tp->root);
 	struct tcindex_filter_result *r = (struct tcindex_filter_result *) arg;
@@ -186,6 +186,8 @@ found:
 		call_rcu(&f->rcu, tcindex_destroy_fexts);
 	else
 		call_rcu(&r->rcu, tcindex_destroy_rexts);
+
+	*last = false;
 	return 0;
 }
 
@@ -193,7 +195,9 @@ static int tcindex_destroy_element(struct tcf_proto *tp,
 				   unsigned long arg,
 				   struct tcf_walker *walker)
 {
-	return tcindex_delete(tp, arg);
+	bool last;
+
+	return tcindex_delete(tp, arg, &last);
 }
 
 static void __tcindex_destroy(struct rcu_head *head)
@@ -529,14 +533,11 @@ static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker)
 	}
 }
 
-static bool tcindex_destroy(struct tcf_proto *tp, bool force)
+static void tcindex_destroy(struct tcf_proto *tp)
 {
 	struct tcindex_data *p = rtnl_dereference(tp->root);
 	struct tcf_walker walker;
 
-	if (!force)
-		return false;
-
 	pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p);
 	walker.count = 0;
 	walker.skip = 0;
@@ -544,7 +545,6 @@ static bool tcindex_destroy(struct tcf_proto *tp, bool force)
 	tcindex_walk(tp, &walker);
 
 	call_rcu(&p->rcu, __tcindex_destroy);
-	return true;
 }
 
 
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 9e2f330ac80f..d20e72a095d5 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -585,37 +585,13 @@ static bool ht_empty(struct tc_u_hnode *ht)
 	return true;
 }
 
-static bool u32_destroy(struct tcf_proto *tp, bool force)
+static void u32_destroy(struct tcf_proto *tp)
 {
 	struct tc_u_common *tp_c = tp->data;
 	struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 
 	WARN_ON(root_ht == NULL);
 
-	if (!force) {
-		if (root_ht) {
-			if (root_ht->refcnt > 1)
-				return false;
-			if (root_ht->refcnt == 1) {
-				if (!ht_empty(root_ht))
-					return false;
-			}
-		}
-
-		if (tp_c->refcnt > 1)
-			return false;
-
-		if (tp_c->refcnt == 1) {
-			struct tc_u_hnode *ht;
-
-			for (ht = rtnl_dereference(tp_c->hlist);
-			     ht;
-			     ht = rtnl_dereference(ht->next))
-				if (!ht_empty(ht))
-					return false;
-		}
-	}
-
 	if (root_ht && --root_ht->refcnt == 0)
 		u32_destroy_hnode(tp, root_ht);
 
@@ -640,20 +616,22 @@ static bool u32_destroy(struct tcf_proto *tp, bool force)
 	}
 
 	tp->data = NULL;
-	return true;
 }
 
-static int u32_delete(struct tcf_proto *tp, unsigned long arg)
+static int u32_delete(struct tcf_proto *tp, unsigned long arg, bool *last)
 {
 	struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
 	struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
+	struct tc_u_common *tp_c = tp->data;
+	int ret = 0;
 
 	if (ht == NULL)
-		return 0;
+		goto out;
 
 	if (TC_U32_KEY(ht->handle)) {
 		u32_remove_hw_knode(tp, ht->handle);
-		return u32_delete_key(tp, (struct tc_u_knode *)ht);
+		ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
+		goto out;
 	}
 
 	if (root_ht == ht)
@@ -666,7 +644,40 @@ static int u32_delete(struct tcf_proto *tp, unsigned long arg)
 		return -EBUSY;
 	}
 
-	return 0;
+out:
+	*last = true;
+	if (root_ht) {
+		if (root_ht->refcnt > 1) {
+			*last = false;
+			goto ret;
+		}
+		if (root_ht->refcnt == 1) {
+			if (!ht_empty(root_ht)) {
+				*last = false;
+				goto ret;
+			}
+		}
+	}
+
+	if (tp_c->refcnt > 1) {
+		*last = false;
+		goto ret;
+	}
+
+	if (tp_c->refcnt == 1) {
+		struct tc_u_hnode *ht;
+
+		for (ht = rtnl_dereference(tp_c->hlist);
+		     ht;
+		     ht = rtnl_dereference(ht->next))
+			if (!ht_empty(ht)) {
+				*last = false;
+				break;
+			}
+	}
+
+ret:
+	return ret;
 }
 
 #define NR_U32_NODE (1<<12)