Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3785 insertions, 0 deletions

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
new file mode 100644
index 000000000..445ab1b05
--- /dev/null
+++ b/net/sched/cls_api.c
@@ -0,0 +1,3785 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * net/sched/cls_api.c	Packet classifier API.
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ * Changes:
+ *
+ * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/kmod.h>
+#include <linux/slab.h>
+#include <linux/idr.h>
+#include <linux/jhash.h>
+#include <linux/rculist.h>
+#include <net/net_namespace.h>
+#include <net/sock.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <net/pkt_cls.h>
+#include <net/tc_act/tc_pedit.h>
+#include <net/tc_act/tc_mirred.h>
+#include <net/tc_act/tc_vlan.h>
+#include <net/tc_act/tc_tunnel_key.h>
+#include <net/tc_act/tc_csum.h>
+#include <net/tc_act/tc_gact.h>
+#include <net/tc_act/tc_police.h>
+#include <net/tc_act/tc_sample.h>
+#include <net/tc_act/tc_skbedit.h>
+#include <net/tc_act/tc_ct.h>
+#include <net/tc_act/tc_mpls.h>
+#include <net/tc_act/tc_gate.h>
+#include <net/flow_offload.h>
+
+/* The list of all installed classifier types */
+static LIST_HEAD(tcf_proto_base);
+
+/* Protects list of registered TC modules. It is pure SMP lock. */
+static DEFINE_RWLOCK(cls_mod_lock);
+
+#ifdef CONFIG_NET_CLS_ACT
+DEFINE_STATIC_KEY_FALSE(tc_skb_ext_tc);
+EXPORT_SYMBOL(tc_skb_ext_tc);
+
+void tc_skb_ext_tc_enable(void)
+{
+	static_branch_inc(&tc_skb_ext_tc);
+}
+EXPORT_SYMBOL(tc_skb_ext_tc_enable);
+
+void tc_skb_ext_tc_disable(void)
+{
+	static_branch_dec(&tc_skb_ext_tc);
+}
+EXPORT_SYMBOL(tc_skb_ext_tc_disable);
+#endif
+
+static u32 destroy_obj_hashfn(const struct tcf_proto *tp)
+{
+	return jhash_3words(tp->chain->index, tp->prio,
+			    (__force __u32)tp->protocol, 0);
+}
+
+static void tcf_proto_signal_destroying(struct tcf_chain *chain,
+					struct tcf_proto *tp)
+{
+	struct tcf_block *block = chain->block;
+
+	mutex_lock(&block->proto_destroy_lock);
+	hash_add_rcu(block->proto_destroy_ht, &tp->destroy_ht_node,
+		     destroy_obj_hashfn(tp));
+	mutex_unlock(&block->proto_destroy_lock);
+}
+
+static bool tcf_proto_cmp(const struct tcf_proto *tp1,
+			  const struct tcf_proto *tp2)
+{
+	return tp1->chain->index == tp2->chain->index &&
+	       tp1->prio == tp2->prio &&
+	       tp1->protocol == tp2->protocol;
+}
+
+static bool tcf_proto_exists_destroying(struct tcf_chain *chain,
+					struct tcf_proto *tp)
+{
+	u32 hash = destroy_obj_hashfn(tp);
+	struct tcf_proto *iter;
+	bool found = false;
+
+	rcu_read_lock();
+	hash_for_each_possible_rcu(chain->block->proto_destroy_ht, iter,
+				   destroy_ht_node, hash) {
+		if (tcf_proto_cmp(tp, iter)) {
+			found = true;
+			break;
+		}
+	}
+	rcu_read_unlock();
+
+	return found;
+}
+
+static void
+tcf_proto_signal_destroyed(struct tcf_chain *chain, struct tcf_proto *tp)
+{
+	struct tcf_block *block = chain->block;
+
+	mutex_lock(&block->proto_destroy_lock);
+	if (hash_hashed(&tp->destroy_ht_node))
+		hash_del_rcu(&tp->destroy_ht_node);
+	mutex_unlock(&block->proto_destroy_lock);
+}
+
+/* Find classifier type by string name */
+
+static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind)
+{
+	const struct tcf_proto_ops *t, *res = NULL;
+
+	if (kind) {
+		read_lock(&cls_mod_lock);
+		list_for_each_entry(t, &tcf_proto_base, head) {
+			if (strcmp(kind, t->kind) == 0) {
+				if (try_module_get(t->owner))
+					res = t;
+				break;
+			}
+		}
+		read_unlock(&cls_mod_lock);
+	}
+	return res;
+}
+
+static const struct tcf_proto_ops *
+tcf_proto_lookup_ops(const char *kind, bool rtnl_held,
+		     struct netlink_ext_ack *extack)
+{
+	const struct tcf_proto_ops *ops;
+
+	ops = __tcf_proto_lookup_ops(kind);
+	if (ops)
+		return ops;
+#ifdef CONFIG_MODULES
+	if (rtnl_held)
+		rtnl_unlock();
+	request_module("cls_%s", kind);
+	if (rtnl_held)
+		rtnl_lock();
+	ops = __tcf_proto_lookup_ops(kind);
+	/* We dropped the RTNL semaphore in order to perform
+	 * the module load. So, even if we succeeded in loading
+	 * the module we have to replay the request. We indicate
+	 * this using -EAGAIN.
+	 */
+	if (ops) {
+		module_put(ops->owner);
+		return ERR_PTR(-EAGAIN);
+	}
+#endif
+	NL_SET_ERR_MSG(extack, "TC classifier not found");
+	return ERR_PTR(-ENOENT);
+}
+
+/* Register(unregister) new classifier type */
+
+int register_tcf_proto_ops(struct tcf_proto_ops *ops)
+{
+	struct tcf_proto_ops *t;
+	int rc = -EEXIST;
+
+	write_lock(&cls_mod_lock);
+	list_for_each_entry(t, &tcf_proto_base, head)
+		if (!strcmp(ops->kind, t->kind))
+			goto out;
+
+	list_add_tail(&ops->head, &tcf_proto_base);
+	rc = 0;
+out:
+	write_unlock(&cls_mod_lock);
+	return rc;
+}
+EXPORT_SYMBOL(register_tcf_proto_ops);
+
+static struct workqueue_struct *tc_filter_wq;
+
+void unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
+{
+	struct tcf_proto_ops *t;
+	int rc = -ENOENT;
+
+	/* Wait for outstanding call_rcu()s, if any, from a
+	 * tcf_proto_ops's destroy() handler.
+	 */
+	rcu_barrier();
+	flush_workqueue(tc_filter_wq);
+
+	write_lock(&cls_mod_lock);
+	list_for_each_entry(t, &tcf_proto_base, head) {
+		if (t == ops) {
+			list_del(&t->head);
+			rc = 0;
+			break;
+		}
+	}
+	write_unlock(&cls_mod_lock);
+
+	WARN(rc, "unregister tc filter kind(%s) failed %d\n", ops->kind, rc);
+}
+EXPORT_SYMBOL(unregister_tcf_proto_ops);
+
+bool tcf_queue_work(struct rcu_work *rwork, work_func_t func)
+{
+	INIT_RCU_WORK(rwork, func);
+	return queue_rcu_work(tc_filter_wq, rwork);
+}
+EXPORT_SYMBOL(tcf_queue_work);
+
+/* Select new prio value from the range, managed by kernel. */
+
+static inline u32 tcf_auto_prio(struct tcf_proto *tp)
+{
+	u32 first = TC_H_MAKE(0xC0000000U, 0U);
+
+	if (tp)
+		first = tp->prio - 1;
+
+	return TC_H_MAJ(first);
+}
+
+static bool tcf_proto_check_kind(struct nlattr *kind, char *name)
+{
+	if (kind)
+		return nla_strscpy(name, kind, IFNAMSIZ) < 0;
+	memset(name, 0, IFNAMSIZ);
+	return false;
+}
+
+static bool tcf_proto_is_unlocked(const char *kind)
+{
+	const struct tcf_proto_ops *ops;
+	bool ret;
+
+	if (strlen(kind) == 0)
+		return false;
+
+	ops = tcf_proto_lookup_ops(kind, false, NULL);
+	/* On error return false to take rtnl lock. Proto lookup/create
+	 * functions will perform lookup again and properly handle errors.
+	 */
+	if (IS_ERR(ops))
+		return false;
+
+	ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED);
+	module_put(ops->owner);
+	return ret;
+}
+
+static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
+					  u32 prio, struct tcf_chain *chain,
+					  bool rtnl_held,
+					  struct netlink_ext_ack *extack)
+{
+	struct tcf_proto *tp;
+	int err;
+
+	tp = kzalloc(sizeof(*tp), GFP_KERNEL);
+	if (!tp)
+		return ERR_PTR(-ENOBUFS);
+
+	tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack);
+	if (IS_ERR(tp->ops)) {
+		err = PTR_ERR(tp->ops);
+		goto errout;
+	}
+	tp->classify = tp->ops->classify;
+	tp->protocol = protocol;
+	tp->prio = prio;
+	tp->chain = chain;
+	spin_lock_init(&tp->lock);
+	refcount_set(&tp->refcnt, 1);
+
+	err = tp->ops->init(tp);
+	if (err) {
+		module_put(tp->ops->owner);
+		goto errout;
+	}
+	return tp;
+
+errout:
+	kfree(tp);
+	return ERR_PTR(err);
+}
+
+static void tcf_proto_get(struct tcf_proto *tp)
+{
+	refcount_inc(&tp->refcnt);
+}
+
+static void tcf_chain_put(struct tcf_chain *chain);
+
+static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held,
+			      bool sig_destroy, struct netlink_ext_ack *extack)
+{
+	tp->ops->destroy(tp, rtnl_held, extack);
+	if (sig_destroy)
+		tcf_proto_signal_destroyed(tp->chain, tp);
+	tcf_chain_put(tp->chain);
+	module_put(tp->ops->owner);
+	kfree_rcu(tp, rcu);
+}
+
+static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held,
+			  struct netlink_ext_ack *extack)
+{
+	if (refcount_dec_and_test(&tp->refcnt))
+		tcf_proto_destroy(tp, rtnl_held, true, extack);
+}
+
+static bool tcf_proto_check_delete(struct tcf_proto *tp)
+{
+	if (tp->ops->delete_empty)
+		return tp->ops->delete_empty(tp);
+
+	tp->deleting = true;
+	return tp->deleting;
+}
+
+static void tcf_proto_mark_delete(struct tcf_proto *tp)
+{
+	spin_lock(&tp->lock);
+	tp->deleting = true;
+	spin_unlock(&tp->lock);
+}
+
+static bool tcf_proto_is_deleting(struct tcf_proto *tp)
+{
+	bool deleting;
+
+	spin_lock(&tp->lock);
+	deleting = tp->deleting;
+	spin_unlock(&tp->lock);
+
+	return deleting;
+}
+
+#define ASSERT_BLOCK_LOCKED(block)					\
+	lockdep_assert_held(&(block)->lock)
+
+struct tcf_filter_chain_list_item {
+	struct list_head list;
+	tcf_chain_head_change_t *chain_head_change;
+	void *chain_head_change_priv;
+};
+
+static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
+					  u32 chain_index)
+{
+	struct tcf_chain *chain;
+
+	ASSERT_BLOCK_LOCKED(block);
+
+	chain = kzalloc(sizeof(*chain), GFP_KERNEL);
+	if (!chain)
+		return NULL;
+	list_add_tail_rcu(&chain->list, &block->chain_list);
+	mutex_init(&chain->filter_chain_lock);
+	chain->block = block;
+	chain->index = chain_index;
+	chain->refcnt = 1;
+	if (!chain->index)
+		block->chain0.chain = chain;
+	return chain;
+}
+
+static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
+				       struct tcf_proto *tp_head)
+{
+	if (item->chain_head_change)
+		item->chain_head_change(tp_head, item->chain_head_change_priv);
+}
+
+static void tcf_chain0_head_change(struct tcf_chain *chain,
+				   struct tcf_proto *tp_head)
+{
+	struct tcf_filter_chain_list_item *item;
+	struct tcf_block *block = chain->block;
+
+	if (chain->index)
+		return;
+
+	mutex_lock(&block->lock);
+	list_for_each_entry(item, &block->chain0.filter_chain_list, list)
+		tcf_chain_head_change_item(item, tp_head);
+	mutex_unlock(&block->lock);
+}
+
+/* Returns true if block can be safely freed. */
+
+static bool tcf_chain_detach(struct tcf_chain *chain)
+{
+	struct tcf_block *block = chain->block;
+
+	ASSERT_BLOCK_LOCKED(block);
+
+	list_del_rcu(&chain->list);
+	if (!chain->index)
+		block->chain0.chain = NULL;
+
+	if (list_empty(&block->chain_list) &&
+	    refcount_read(&block->refcnt) == 0)
+		return true;
+
+	return false;
+}
+
+static void tcf_block_destroy(struct tcf_block *block)
+{
+	mutex_destroy(&block->lock);
+	mutex_destroy(&block->proto_destroy_lock);
+	kfree_rcu(block, rcu);
+}
+
+static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block)
+{
+	struct tcf_block *block = chain->block;
+
+	mutex_destroy(&chain->filter_chain_lock);
+	kfree_rcu(chain, rcu);
+	if (free_block)
+		tcf_block_destroy(block);
+}
+
+static void tcf_chain_hold(struct tcf_chain *chain)
+{
+	ASSERT_BLOCK_LOCKED(chain->block);
+
+	++chain->refcnt;
+}
+
+static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain)
+{
+	ASSERT_BLOCK_LOCKED(chain->block);
+
+	/* In case all the references are action references, this
+	 * chain should not be shown to the user.
+	 */
+	return chain->refcnt == chain->action_refcnt;
+}
+
+static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block,
+					  u32 chain_index)
+{
+	struct tcf_chain *chain;
+
+	ASSERT_BLOCK_LOCKED(block);
+
+	list_for_each_entry(chain, &block->chain_list, list) {
+		if (chain->index == chain_index)
+			return chain;
+	}
+	return NULL;
+}
+
+#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
+static struct tcf_chain *tcf_chain_lookup_rcu(const struct tcf_block *block,
+					      u32 chain_index)
+{
+	struct tcf_chain *chain;
+
+	list_for_each_entry_rcu(chain, &block->chain_list, list) {
+		if (chain->index == chain_index)
+			return chain;
+	}
+	return NULL;
+}
+#endif
+
+static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
+			   u32 seq, u16 flags, int event, bool unicast,
+			   struct netlink_ext_ack *extack);
+
+static struct tcf_chain *__tcf_chain_get(struct tcf_block *block,
+					 u32 chain_index, bool create,
+					 bool by_act)
+{
+	struct tcf_chain *chain = NULL;
+	bool is_first_reference;
+
+	mutex_lock(&block->lock);
+	chain = tcf_chain_lookup(block, chain_index);
+	if (chain) {
+		tcf_chain_hold(chain);
+	} else {
+		if (!create)
+			goto errout;
+		chain = tcf_chain_create(block, chain_index);
+		if (!chain)
+			goto errout;
+	}
+
+	if (by_act)
+		++chain->action_refcnt;
+	is_first_reference = chain->refcnt - chain->action_refcnt == 1;
+	mutex_unlock(&block->lock);
+
+	/* Send notification only in case we got the first
+	 * non-action reference. Until then, the chain acts only as
+	 * a placeholder for actions pointing to it and user ought
+	 * not know about them.
+	 */
+	if (is_first_reference && !by_act)
+		tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
+				RTM_NEWCHAIN, false, NULL);
+
+	return chain;
+
+errout:
+	mutex_unlock(&block->lock);
+	return chain;
+}
+
+static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
+				       bool create)
+{
+	return __tcf_chain_get(block, chain_index, create, false);
+}
+
+struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index)
+{
+	return __tcf_chain_get(block, chain_index, true, true);
+}
+EXPORT_SYMBOL(tcf_chain_get_by_act);
+
+static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
+			       void *tmplt_priv);
+static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
+				  void *tmplt_priv, u32 chain_index,
+				  struct tcf_block *block, struct sk_buff *oskb,
+				  u32 seq, u16 flags, bool unicast);
+
+static void __tcf_chain_put(struct tcf_chain *chain, bool by_act,
+			    bool explicitly_created)
+{
+	struct tcf_block *block = chain->block;
+	const struct tcf_proto_ops *tmplt_ops;
+	unsigned int refcnt, non_act_refcnt;
+	bool free_block = false;
+	void *tmplt_priv;
+
+	mutex_lock(&block->lock);
+	if (explicitly_created) {
+		if (!chain->explicitly_created) {
+			mutex_unlock(&block->lock);
+			return;
+		}
+		chain->explicitly_created = false;
+	}
+
+	if (by_act)
+		chain->action_refcnt--;
+
+	/* tc_chain_notify_delete can't be called while holding block lock.
+	 * However, when block is unlocked chain can be changed concurrently, so
+	 * save these to temporary variables.
+	 */
+	refcnt = --chain->refcnt;
+	non_act_refcnt = refcnt - chain->action_refcnt;
+	tmplt_ops = chain->tmplt_ops;
+	tmplt_priv = chain->tmplt_priv;
+
+	if (non_act_refcnt == chain->explicitly_created && !by_act) {
+		if (non_act_refcnt == 0)
+			tc_chain_notify_delete(tmplt_ops, tmplt_priv,
+					       chain->index, block, NULL, 0, 0,
+					       false);
+		/* Last reference to chain, no need to lock. */
+		chain->flushing = false;
+	}
+
+	if (refcnt == 0)
+		free_block = tcf_chain_detach(chain);
+	mutex_unlock(&block->lock);
+
+	if (refcnt == 0) {
+		tc_chain_tmplt_del(tmplt_ops, tmplt_priv);
+		tcf_chain_destroy(chain, free_block);
+	}
+}
+
+static void tcf_chain_put(struct tcf_chain *chain)
+{
+	__tcf_chain_put(chain, false, false);
+}
+
+void tcf_chain_put_by_act(struct tcf_chain *chain)
+{
+	__tcf_chain_put(chain, true, false);
+}
+EXPORT_SYMBOL(tcf_chain_put_by_act);
+
+static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
+{
+	__tcf_chain_put(chain, false, true);
+}
+
+static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held)
+{
+	struct tcf_proto *tp, *tp_next;
+
+	mutex_lock(&chain->filter_chain_lock);
+	tp = tcf_chain_dereference(chain->filter_chain, chain);
+	while (tp) {
+		tp_next = rcu_dereference_protected(tp->next, 1);
+		tcf_proto_signal_destroying(chain, tp);
+		tp = tp_next;
+	}
+	tp = tcf_chain_dereference(chain->filter_chain, chain);
+	RCU_INIT_POINTER(chain->filter_chain, NULL);
+	tcf_chain0_head_change(chain, NULL);
+	chain->flushing = true;
+	mutex_unlock(&chain->filter_chain_lock);
+
+	while (tp) {
+		tp_next = rcu_dereference_protected(tp->next, 1);
+		tcf_proto_put(tp, rtnl_held, NULL);
+		tp = tp_next;
+	}
+}
+
+static int tcf_block_setup(struct tcf_block *block,
+			   struct flow_block_offload *bo);
+
+static void tcf_block_offload_init(struct flow_block_offload *bo,
+				   struct net_device *dev, struct Qdisc *sch,
+				   enum flow_block_command command,
+				   enum flow_block_binder_type binder_type,
+				   struct flow_block *flow_block,
+				   bool shared, struct netlink_ext_ack *extack)
+{
+	bo->net = dev_net(dev);
+	bo->command = command;
+	bo->binder_type = binder_type;
+	bo->block = flow_block;
+	bo->block_shared = shared;
+	bo->extack = extack;
+	bo->sch = sch;
+	bo->cb_list_head = &flow_block->cb_list;
+	INIT_LIST_HEAD(&bo->cb_list);
+}
+
+static void tcf_block_unbind(struct tcf_block *block,
+			     struct flow_block_offload *bo);
+
+static void tc_block_indr_cleanup(struct flow_block_cb *block_cb)
+{
+	struct tcf_block *block = block_cb->indr.data;
+	struct net_device *dev = block_cb->indr.dev;
+	struct Qdisc *sch = block_cb->indr.sch;
+	struct netlink_ext_ack extack = {};
+	struct flow_block_offload bo = {};
+
+	tcf_block_offload_init(&bo, dev, sch, FLOW_BLOCK_UNBIND,
+			       block_cb->indr.binder_type,
+			       &block->flow_block, tcf_block_shared(block),
+			       &extack);
+	rtnl_lock();
+	down_write(&block->cb_lock);
+	list_del(&block_cb->driver_list);
+	list_move(&block_cb->list, &bo.cb_list);
+	tcf_block_unbind(block, &bo);
+	up_write(&block->cb_lock);
+	rtnl_unlock();
+}
+
+static bool tcf_block_offload_in_use(struct tcf_block *block)
+{
+	return atomic_read(&block->offloadcnt);
+}
+
+static int tcf_block_offload_cmd(struct tcf_block *block,
+				 struct net_device *dev, struct Qdisc *sch,
+				 struct tcf_block_ext_info *ei,
+				 enum flow_block_command command,
+				 struct netlink_ext_ack *extack)
+{
+	struct flow_block_offload bo = {};
+
+	tcf_block_offload_init(&bo, dev, sch, command, ei->binder_type,
+			       &block->flow_block, tcf_block_shared(block),
+			       extack);
+
+	if (dev->netdev_ops->ndo_setup_tc) {
+		int err;
+
+		err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
+		if (err < 0) {
+			if (err != -EOPNOTSUPP)
+				NL_SET_ERR_MSG(extack, "Driver ndo_setup_tc failed");
+			return err;
+		}
+
+		return tcf_block_setup(block, &bo);
+	}
+
+	flow_indr_dev_setup_offload(dev, sch, TC_SETUP_BLOCK, block, &bo,
+				    tc_block_indr_cleanup);
+	tcf_block_setup(block, &bo);
+
+	return -EOPNOTSUPP;
+}
+
+static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
+				  struct tcf_block_ext_info *ei,
+				  struct netlink_ext_ack *extack)
+{
+	struct net_device *dev = q->dev_queue->dev;
+	int err;
+
+	down_write(&block->cb_lock);
+
+	/* If tc offload feature is disabled and the block we try to bind
+	 * to already has some offloaded filters, forbid to bind.
+	 */
+	if (dev->netdev_ops->ndo_setup_tc &&
+	    !tc_can_offload(dev) &&
+	    tcf_block_offload_in_use(block)) {
+		NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled");
+		err = -EOPNOTSUPP;
+		goto err_unlock;
+	}
+
+	err = tcf_block_offload_cmd(block, dev, q, ei, FLOW_BLOCK_BIND, extack);
+	if (err == -EOPNOTSUPP)
+		goto no_offload_dev_inc;
+	if (err)
+		goto err_unlock;
+
+	up_write(&block->cb_lock);
+	return 0;
+
+no_offload_dev_inc:
+	if (tcf_block_offload_in_use(block))
+		goto err_unlock;
+
+	err = 0;
+	block->nooffloaddevcnt++;
+err_unlock:
+	up_write(&block->cb_lock);
+	return err;
+}
+
+static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
+				     struct tcf_block_ext_info *ei)
+{
+	struct net_device *dev = q->dev_queue->dev;
+	int err;
+
+	down_write(&block->cb_lock);
+	err = tcf_block_offload_cmd(block, dev, q, ei, FLOW_BLOCK_UNBIND, NULL);
+	if (err == -EOPNOTSUPP)
+		goto no_offload_dev_dec;
+	up_write(&block->cb_lock);
+	return;
+
+no_offload_dev_dec:
+	WARN_ON(block->nooffloaddevcnt-- == 0);
+	up_write(&block->cb_lock);
+}
+
+static int
+tcf_chain0_head_change_cb_add(struct tcf_block *block,
+			      struct tcf_block_ext_info *ei,
+			      struct netlink_ext_ack *extack)
+{
+	struct tcf_filter_chain_list_item *item;
+	struct tcf_chain *chain0;
+
+	item = kmalloc(sizeof(*item), GFP_KERNEL);
+	if (!item) {
+		NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed");
+		return -ENOMEM;
+	}
+	item->chain_head_change = ei->chain_head_change;
+	item->chain_head_change_priv = ei->chain_head_change_priv;
+
+	mutex_lock(&block->lock);
+	chain0 = block->chain0.chain;
+	if (chain0)
+		tcf_chain_hold(chain0);
+	else
+		list_add(&item->list, &block->chain0.filter_chain_list);
+	mutex_unlock(&block->lock);
+
+	if (chain0) {
+		struct tcf_proto *tp_head;
+
+		mutex_lock(&chain0->filter_chain_lock);
+
+		tp_head = tcf_chain_dereference(chain0->filter_chain, chain0);
+		if (tp_head)
+			tcf_chain_head_change_item(item, tp_head);
+
+		mutex_lock(&block->lock);
+		list_add(&item->list, &block->chain0.filter_chain_list);
+		mutex_unlock(&block->lock);
+
+		mutex_unlock(&chain0->filter_chain_lock);
+		tcf_chain_put(chain0);
+	}
+
+	return 0;
+}
+
+static void
+tcf_chain0_head_change_cb_del(struct tcf_block *block,
+			      struct tcf_block_ext_info *ei)
+{
+	struct tcf_filter_chain_list_item *item;
+
+	mutex_lock(&block->lock);
+	list_for_each_entry(item, &block->chain0.filter_chain_list, list) {
+		if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
+		    (item->chain_head_change == ei->chain_head_change &&
+		     item->chain_head_change_priv == ei->chain_head_change_priv)) {
+			if (block->chain0.chain)
+				tcf_chain_head_change_item(item, NULL);
+			list_del(&item->list);
+			mutex_unlock(&block->lock);
+
+			kfree(item);
+			return;
+		}
+	}
+	mutex_unlock(&block->lock);
+	WARN_ON(1);
+}
+
+struct tcf_net {
+	spinlock_t idr_lock; /* Protects idr */
+	struct idr idr;
+};
+
+static unsigned int tcf_net_id;
+
+static int tcf_block_insert(struct tcf_block *block, struct net *net,
+			    struct netlink_ext_ack *extack)
+{
+	struct tcf_net *tn = net_generic(net, tcf_net_id);
+	int err;
+
+	idr_preload(GFP_KERNEL);
+	spin_lock(&tn->idr_lock);
+	err = idr_alloc_u32(&tn->idr, block, &block->index, block->index,
+			    GFP_NOWAIT);
+	spin_unlock(&tn->idr_lock);
+	idr_preload_end();
+
+	return err;
+}
+
+static void tcf_block_remove(struct tcf_block *block, struct net *net)
+{
+	struct tcf_net *tn = net_generic(net, tcf_net_id);
+
+	spin_lock(&tn->idr_lock);
+	idr_remove(&tn->idr, block->index);
+	spin_unlock(&tn->idr_lock);
+}
+
+static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
+					  u32 block_index,
+					  struct netlink_ext_ack *extack)
+{
+	struct tcf_block *block;
+
+	block = kzalloc(sizeof(*block), GFP_KERNEL);
+	if (!block) {
+		NL_SET_ERR_MSG(extack, "Memory allocation for block failed");
+		return ERR_PTR(-ENOMEM);
+	}
+	mutex_init(&block->lock);
+	mutex_init(&block->proto_destroy_lock);
+	init_rwsem(&block->cb_lock);
+	flow_block_init(&block->flow_block);
+	INIT_LIST_HEAD(&block->chain_list);
+	INIT_LIST_HEAD(&block->owner_list);
+	INIT_LIST_HEAD(&block->chain0.filter_chain_list);
+
+	refcount_set(&block->refcnt, 1);
+	block->net = net;
+	block->index = block_index;
+
+	/* Don't store q pointer for blocks which are shared */
+	if (!tcf_block_shared(block))
+		block->q = q;
+	return block;
+}
+
+static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
+{
+	struct tcf_net *tn = net_generic(net, tcf_net_id);
+
+	return idr_find(&tn->idr, block_index);
+}
+
+static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index)
+{
+	struct tcf_block *block;
+
+	rcu_read_lock();
+	block = tcf_block_lookup(net, block_index);
+	if (block && !refcount_inc_not_zero(&block->refcnt))
+		block = NULL;
+	rcu_read_unlock();
+
+	return block;
+}
+
+static struct tcf_chain *
+__tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
+{
+	mutex_lock(&block->lock);
+	if (chain)
+		chain = list_is_last(&chain->list, &block->chain_list) ?
+			NULL : list_next_entry(chain, list);
+	else
+		chain = list_first_entry_or_null(&block->chain_list,
+						 struct tcf_chain, list);
+
+	/* skip all action-only chains */
+	while (chain && tcf_chain_held_by_acts_only(chain))
+		chain = list_is_last(&chain->list, &block->chain_list) ?
+			NULL : list_next_entry(chain, list);
+
+	if (chain)
+		tcf_chain_hold(chain);
+	mutex_unlock(&block->lock);
+
+	return chain;
+}
+
+/* Function to be used by all clients that want to iterate over all chains on
+ * block. It properly obtains block->lock and takes reference to chain before
+ * returning it. Users of this function must be tolerant to concurrent chain
+ * insertion/deletion or ensure that no concurrent chain modification is
+ * possible. Note that all netlink dump callbacks cannot guarantee to provide
+ * consistent dump because rtnl lock is released each time skb is filled with
+ * data and sent to user-space.
+ */
+
+struct tcf_chain *
+tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
+{
+	struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain);
+
+	if (chain)
+		tcf_chain_put(chain);
+
+	return chain_next;
+}
+EXPORT_SYMBOL(tcf_get_next_chain);
+
+static struct tcf_proto *
+__tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
+{
+	u32 prio = 0;
+
+	ASSERT_RTNL();
+	mutex_lock(&chain->filter_chain_lock);
+
+	if (!tp) {
+		tp = tcf_chain_dereference(chain->filter_chain, chain);
+	} else if (tcf_proto_is_deleting(tp)) {
+		/* 'deleting' flag is set and chain->filter_chain_lock was
+		 * unlocked, which means next pointer could be invalid. Restart
+		 * search.
+		 */
+		prio = tp->prio + 1;
+		tp = tcf_chain_dereference(chain->filter_chain, chain);
+
+		for (; tp; tp = tcf_chain_dereference(tp->next, chain))
+			if (!tp->deleting && tp->prio >= prio)
+				break;
+	} else {
+		tp = tcf_chain_dereference(tp->next, chain);
+	}
+
+	if (tp)
+		tcf_proto_get(tp);
+
+	mutex_unlock(&chain->filter_chain_lock);
+
+	return tp;
+}
+
+/* Function to be used by all clients that want to iterate over all tp's on
+ * chain. Users of this function must be tolerant to concurrent tp
+ * insertion/deletion or ensure that no concurrent chain modification is
+ * possible. Note that all netlink dump callbacks cannot guarantee to provide
+ * consistent dump because rtnl lock is released each time skb is filled with
+ * data and sent to user-space.
+ */
+
+struct tcf_proto *
+tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
+{
+	struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp);
+
+	if (tp)
+		tcf_proto_put(tp, true, NULL);
+
+	return tp_next;
+}
+EXPORT_SYMBOL(tcf_get_next_proto);
+
+static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held)
+{
+	struct tcf_chain *chain;
+
+	/* Last reference to block. At this point chains cannot be added or
+	 * removed concurrently.
+	 */
+	for (chain = tcf_get_next_chain(block, NULL);
+	     chain;
+	     chain = tcf_get_next_chain(block, chain)) {
+		tcf_chain_put_explicitly_created(chain);
+		tcf_chain_flush(chain, rtnl_held);
+	}
+}
+
+/* Lookup Qdisc and increments its reference counter.
+ * Set parent, if necessary.
+ */
+
+static int __tcf_qdisc_find(struct net *net, struct Qdisc **q,
+			    u32 *parent, int ifindex, bool rtnl_held,
+			    struct netlink_ext_ack *extack)
+{
+	const struct Qdisc_class_ops *cops;
+	struct net_device *dev;
+	int err = 0;
+
+	if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
+		return 0;
+
+	rcu_read_lock();
+
+	/* Find link */
+	dev = dev_get_by_index_rcu(net, ifindex);
+	if (!dev) {
+		rcu_read_unlock();
+		return -ENODEV;
+	}
+
+	/* Find qdisc */
+	if (!*parent) {
+		*q = rcu_dereference(dev->qdisc);
+		*parent = (*q)->handle;
+	} else {
+		*q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent));
+		if (!*q) {
+			NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
+			err = -EINVAL;
+			goto errout_rcu;
+		}
+	}
+
+	*q = qdisc_refcount_inc_nz(*q);
+	if (!*q) {
+		NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
+		err = -EINVAL;
+		goto errout_rcu;
+	}
+
+	/* Is it classful? */
+	cops = (*q)->ops->cl_ops;
+	if (!cops) {
+		NL_SET_ERR_MSG(extack, "Qdisc not classful");
+		err = -EINVAL;
+		goto errout_qdisc;
+	}
+
+	if (!cops->tcf_block) {
+		NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
+		err = -EOPNOTSUPP;
+		goto errout_qdisc;
+	}
+
+errout_rcu:
+	/* At this point we know that qdisc is not noop_qdisc,
+	 * which means that qdisc holds a reference to net_device
+	 * and we hold a reference to qdisc, so it is safe to release
+	 * rcu read lock.
+	 */
+	rcu_read_unlock();
+	return err;
+
+errout_qdisc:
+	rcu_read_unlock();
+
+	if (rtnl_held)
+		qdisc_put(*q);
+	else
+		qdisc_put_unlocked(*q);
+	*q = NULL;
+
+	return err;
+}
+
+static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl,
+			       int ifindex, struct netlink_ext_ack *extack)
+{
+	if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
+		return 0;
+
+	/* Do we search for filter, attached to class? */
+	if (TC_H_MIN(parent)) {
+		const struct Qdisc_class_ops *cops = q->ops->cl_ops;
+
+		*cl = cops->find(q, parent);
+		if (*cl == 0) {
+			NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
+			return -ENOENT;
+		}
+	}
+
+	return 0;
+}
+
+static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q,
+					  unsigned long cl, int ifindex,
+					  u32 block_index,
+					  struct netlink_ext_ack *extack)
+{
+	struct tcf_block *block;
+
+	if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
+		block = tcf_block_refcnt_get(net, block_index);
+		if (!block) {
+			NL_SET_ERR_MSG(extack, "Block of given index was not found");
+			return ERR_PTR(-EINVAL);
+		}
+	} else {
+		const struct Qdisc_class_ops *cops = q->ops->cl_ops;
+
+		block = cops->tcf_block(q, cl, extack);
+		if (!block)
+			return ERR_PTR(-EINVAL);
+
+		if (tcf_block_shared(block)) {
+			NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
+			return ERR_PTR(-EOPNOTSUPP);
+		}
+
+		/* Always take reference to block in order to support execution
+		 * of rules update path of cls API without rtnl lock. Caller
+		 * must release block when it is finished using it. 'if' block
+		 * of this conditional obtain reference to block by calling
+		 * tcf_block_refcnt_get().
+		 */
+		refcount_inc(&block->refcnt);
+	}
+
+	return block;
+}
+
+static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q,
+			    struct tcf_block_ext_info *ei, bool rtnl_held)
+{
+	if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) {
+		/* Flushing/putting all chains will cause the block to be
+		 * deallocated when last chain is freed. However, if chain_list
+		 * is empty, block has to be manually deallocated. After block
+		 * reference counter reached 0, it is no longer possible to
+		 * increment it or add new chains to block.
+		 */
+		bool free_block = list_empty(&block->chain_list);
+
+		mutex_unlock(&block->lock);
+		if (tcf_block_shared(block))
+			tcf_block_remove(block, block->net);
+
+		if (q)
+			tcf_block_offload_unbind(block, q, ei);
+
+		if (free_block)
+			tcf_block_destroy(block);
+		else
+			tcf_block_flush_all_chains(block, rtnl_held);
+	} else if (q) {
+		tcf_block_offload_unbind(block, q, ei);
+	}
+}
+
+static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held)
+{
+	__tcf_block_put(block, NULL, NULL, rtnl_held);
+}
+
+/* Find tcf block.
+ * Set q, parent, cl when appropriate.
+ */
+
+static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
+					u32 *parent, unsigned long *cl,
+					int ifindex, u32 block_index,
+					struct netlink_ext_ack *extack)
+{
+	struct tcf_block *block;
+	int err = 0;
+
+	ASSERT_RTNL();
+
+	err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack);
+	if (err)
+		goto errout;
+
+	err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack);
+	if (err)
+		goto errout_qdisc;
+
+	block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack);
+	if (IS_ERR(block)) {
+		err = PTR_ERR(block);
+		goto errout_qdisc;
+	}
+
+	return block;
+
+errout_qdisc:
+	if (*q)
+		qdisc_put(*q);
+errout:
+	*q = NULL;
+	return ERR_PTR(err);
+}
+
+static void tcf_block_release(struct Qdisc *q, struct tcf_block *block,
+			      bool rtnl_held)
+{
+	if (!IS_ERR_OR_NULL(block))
+		tcf_block_refcnt_put(block, rtnl_held);
+
+	if (q) {
+		if (rtnl_held)
+			qdisc_put(q);
+		else
+			qdisc_put_unlocked(q);
+	}
+}
+
+struct tcf_block_owner_item {
+	struct list_head list;
+	struct Qdisc *q;
+	enum flow_block_binder_type binder_type;
+};
+
+static void
+tcf_block_owner_netif_keep_dst(struct tcf_block *block,
+			       struct Qdisc *q,
+			       enum flow_block_binder_type binder_type)
+{
+	if (block->keep_dst &&
+	    binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
+	    binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
+		netif_keep_dst(qdisc_dev(q));
+}
+
+void tcf_block_netif_keep_dst(struct tcf_block *block)
+{
+	struct tcf_block_owner_item *item;
+
+	block->keep_dst = true;
+	list_for_each_entry(item, &block->owner_list, list)
+		tcf_block_owner_netif_keep_dst(block, item->q,
+					       item->binder_type);
+}
+EXPORT_SYMBOL(tcf_block_netif_keep_dst);
+
+static int tcf_block_owner_add(struct tcf_block *block,
+			       struct Qdisc *q,
+			       enum flow_block_binder_type binder_type)
+{
+	struct tcf_block_owner_item *item;
+
+	item = kmalloc(sizeof(*item), GFP_KERNEL);
+	if (!item)
+		return -ENOMEM;
+	item->q = q;
+	item->binder_type = binder_type;
+	list_add(&item->list, &block->owner_list);
+	return 0;
+}
+
+static void tcf_block_owner_del(struct tcf_block *block,
+				struct Qdisc *q,
+				enum flow_block_binder_type binder_type)
+{
+	struct tcf_block_owner_item *item;
+
+	list_for_each_entry(item, &block->owner_list, list) {
+		if (item->q == q && item->binder_type == binder_type) {
+			list_del(&item->list);
+			kfree(item);
+			return;
+		}
+	}
+	WARN_ON(1);
+}
+
+int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
+		      struct tcf_block_ext_info *ei,
+		      struct netlink_ext_ack *extack)
+{
+	struct net *net = qdisc_net(q);
+	struct tcf_block *block = NULL;
+	int err;
+
+	if (ei->block_index)
+		/* block_index not 0 means the shared block is requested */
+		block = tcf_block_refcnt_get(net, ei->block_index);
+
+	if (!block) {
+		block = tcf_block_create(net, q, ei->block_index, extack);
+		if (IS_ERR(block))
+			return PTR_ERR(block);
+		if (tcf_block_shared(block)) {
+			err = tcf_block_insert(block, net, extack);
+			if (err)
+				goto err_block_insert;
+		}
+	}
+
+	err = tcf_block_owner_add(block, q, ei->binder_type);
+	if (err)
+		goto err_block_owner_add;
+
+	tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
+
+	err = tcf_chain0_head_change_cb_add(block, ei, extack);
+	if (err)
+		goto err_chain0_head_change_cb_add;
+
+	err = tcf_block_offload_bind(block, q, ei, extack);
+	if (err)
+		goto err_block_offload_bind;
+
+	*p_block = block;
+	return 0;
+
+err_block_offload_bind:
+	tcf_chain0_head_change_cb_del(block, ei);
+err_chain0_head_change_cb_add:
+	tcf_block_owner_del(block, q, ei->binder_type);
+err_block_owner_add:
+err_block_insert:
+	tcf_block_refcnt_put(block, true);
+	return err;
+}
+EXPORT_SYMBOL(tcf_block_get_ext);
+
+static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
+{
+	struct tcf_proto __rcu **p_filter_chain = priv;
+
+	rcu_assign_pointer(*p_filter_chain, tp_head);
+}
+
+int tcf_block_get(struct tcf_block **p_block,
+		  struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
+		  struct netlink_ext_ack *extack)
+{
+	struct tcf_block_ext_info ei = {
+		.chain_head_change = tcf_chain_head_change_dflt,
+		.chain_head_change_priv = p_filter_chain,
+	};
+
+	WARN_ON(!p_filter_chain);
+	return tcf_block_get_ext(p_block, q, &ei, extack);
+}
+EXPORT_SYMBOL(tcf_block_get);
+
+/* XXX: Standalone actions are not allowed to jump to any chain, and bound
+ * actions should be all removed after flushing.
+ */
+void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
+		       struct tcf_block_ext_info *ei)
+{
+	if (!block)
+		return;
+	tcf_chain0_head_change_cb_del(block, ei);
+	tcf_block_owner_del(block, q, ei->binder_type);
+
+	__tcf_block_put(block, q, ei, true);
+}
+EXPORT_SYMBOL(tcf_block_put_ext);
+
+void tcf_block_put(struct tcf_block *block)
+{
+	struct tcf_block_ext_info ei = {0, };
+
+	if (!block)
+		return;
+	tcf_block_put_ext(block, block->q, &ei);
+}
+
+EXPORT_SYMBOL(tcf_block_put);
+
+static int
+tcf_block_playback_offloads(struct tcf_block *block, flow_setup_cb_t *cb,
+			    void *cb_priv, bool add, bool offload_in_use,
+			    struct netlink_ext_ack *extack)
+{
+	struct tcf_chain *chain, *chain_prev;
+	struct tcf_proto *tp, *tp_prev;
+	int err;
+
+	lockdep_assert_held(&block->cb_lock);
+
+	for (chain = __tcf_get_next_chain(block, NULL);
+	     chain;
+	     chain_prev = chain,
+		     chain = __tcf_get_next_chain(block, chain),
+		     tcf_chain_put(chain_prev)) {
+		for (tp = __tcf_get_next_proto(chain, NULL); tp;
+		     tp_prev = tp,
+			     tp = __tcf_get_next_proto(chain, tp),
+			     tcf_proto_put(tp_prev, true, NULL)) {
+			if (tp->ops->reoffload) {
+				err = tp->ops->reoffload(tp, add, cb, cb_priv,
+							 extack);
+				if (err && add)
+					goto err_playback_remove;
+			} else if (add && offload_in_use) {
+				err = -EOPNOTSUPP;
+				NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support");
+				goto err_playback_remove;
+			}
+		}
+	}
+
+	return 0;
+
+err_playback_remove:
+	tcf_proto_put(tp, true, NULL);
+	tcf_chain_put(chain);
+	tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use,
+				    extack);
+	return err;
+}
+
+static int tcf_block_bind(struct tcf_block *block,
+			  struct flow_block_offload *bo)
+{
+	struct flow_block_cb *block_cb, *next;
+	int err, i = 0;
+
+	lockdep_assert_held(&block->cb_lock);
+
+	list_for_each_entry(block_cb, &bo->cb_list, list) {
+		err = tcf_block_playback_offloads(block, block_cb->cb,
+						  block_cb->cb_priv, true,
+						  tcf_block_offload_in_use(block),
+						  bo->extack);
+		if (err)
+			goto err_unroll;
+		if (!bo->unlocked_driver_cb)
+			block->lockeddevcnt++;
+
+		i++;
+	}
+	list_splice(&bo->cb_list, &block->flow_block.cb_list);
+
+	return 0;
+
+err_unroll:
+	list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) {
+		list_del(&block_cb->driver_list);
+		if (i-- > 0) {
+			list_del(&block_cb->list);
+			tcf_block_playback_offloads(block, block_cb->cb,
+						    block_cb->cb_priv, false,
+						    tcf_block_offload_in_use(block),
+						    NULL);
+			if (!bo->unlocked_driver_cb)
+				block->lockeddevcnt--;
+		}
+		flow_block_cb_free(block_cb);
+	}
+
+	return err;
+}
+
+static void tcf_block_unbind(struct tcf_block *block,
+			     struct flow_block_offload *bo)
+{
+	struct flow_block_cb *block_cb, *next;
+
+	lockdep_assert_held(&block->cb_lock);
+
+	list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) {
+		tcf_block_playback_offloads(block, block_cb->cb,
+					    block_cb->cb_priv, false,
+					    tcf_block_offload_in_use(block),
+					    NULL);
+		list_del(&block_cb->list);
+		flow_block_cb_free(block_cb);
+		if (!bo->unlocked_driver_cb)
+			block->lockeddevcnt--;
+	}
+}
+
+static int tcf_block_setup(struct tcf_block *block,
+			   struct flow_block_offload *bo)
+{
+	int err;
+
+	switch (bo->command) {
+	case FLOW_BLOCK_BIND:
+		err = tcf_block_bind(block, bo);
+		break;
+	case FLOW_BLOCK_UNBIND:
+		err = 0;
+		tcf_block_unbind(block, bo);
+		break;
+	default:
+		WARN_ON_ONCE(1);
+		err = -EOPNOTSUPP;
+	}
+
+	return err;
+}
+
+/* Main classifier routine: scans classifier chain attached
+ * to this qdisc, (optionally) tests for protocol and asks
+ * specific classifiers.
+ */
+static inline int __tcf_classify(struct sk_buff *skb,
+				 const struct tcf_proto *tp,
+				 const struct tcf_proto *orig_tp,
+				 struct tcf_result *res,
+				 bool compat_mode,
+				 u32 *last_executed_chain)
+{
+#ifdef CONFIG_NET_CLS_ACT
+	const int max_reclassify_loop = 16;
+	const struct tcf_proto *first_tp;
+	int limit = 0;
+
+reclassify:
+#endif
+	for (; tp; tp = rcu_dereference_bh(tp->next)) {
+		__be16 protocol = skb_protocol(skb, false);
+		int err;
+
+		if (tp->protocol != protocol &&
+		    tp->protocol != htons(ETH_P_ALL))
+			continue;
+
+		err = tp->classify(skb, tp, res);
+#ifdef CONFIG_NET_CLS_ACT
+		if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
+			first_tp = orig_tp;
+			*last_executed_chain = first_tp->chain->index;
+			goto reset;
+		} else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
+			first_tp = res->goto_tp;
+			*last_executed_chain = err & TC_ACT_EXT_VAL_MASK;
+			goto reset;
+		}
+#endif
+		if (err >= 0)
+			return err;
+	}
+
+	return TC_ACT_UNSPEC; /* signal: continue lookup */
+#ifdef CONFIG_NET_CLS_ACT
+reset:
+	if (unlikely(limit++ >= max_reclassify_loop)) {
+		net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n",
+				       tp->chain->block->index,
+				       tp->prio & 0xffff,
+				       ntohs(tp->protocol));
+		return TC_ACT_SHOT;
+	}
+
+	tp = first_tp;
+	goto reclassify;
+#endif
+}
+
+int tcf_classify(struct sk_buff *skb,
+		 const struct tcf_block *block,
+		 const struct tcf_proto *tp,
+		 struct tcf_result *res, bool compat_mode)
+{
+#if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
+	u32 last_executed_chain = 0;
+
+	return __tcf_classify(skb, tp, tp, res, compat_mode,
+			      &last_executed_chain);
+#else
+	u32 last_executed_chain = tp ? tp->chain->index : 0;
+	const struct tcf_proto *orig_tp = tp;
+	struct tc_skb_ext *ext;
+	int ret;
+
+	if (block) {
+		ext = skb_ext_find(skb, TC_SKB_EXT);
+
+		if (ext && ext->chain) {
+			struct tcf_chain *fchain;
+
+			fchain = tcf_chain_lookup_rcu(block, ext->chain);
+			if (!fchain)
+				return TC_ACT_SHOT;
+
+			/* Consume, so cloned/redirect skbs won't inherit ext */
+			skb_ext_del(skb, TC_SKB_EXT);
+
+			tp = rcu_dereference_bh(fchain->filter_chain);
+			last_executed_chain = fchain->index;
+		}
+	}
+
+	ret = __tcf_classify(skb, tp, orig_tp, res, compat_mode,
+			     &last_executed_chain);
+
+	if (tc_skb_ext_tc_enabled()) {
+		/* If we missed on some chain */
+		if (ret == TC_ACT_UNSPEC && last_executed_chain) {
+			struct tc_skb_cb *cb = tc_skb_cb(skb);
+
+			ext = tc_skb_ext_alloc(skb);
+			if (WARN_ON_ONCE(!ext))
+				return TC_ACT_SHOT;
+			ext->chain = last_executed_chain;
+			ext->mru = cb->mru;
+			ext->post_ct = cb->post_ct;
+			ext->post_ct_snat = cb->post_ct_snat;
+			ext->post_ct_dnat = cb->post_ct_dnat;
+			ext->zone = cb->zone;
+		}
+	}
+
+	return ret;
+#endif
+}
+EXPORT_SYMBOL(tcf_classify);
+
+struct tcf_chain_info {
+	struct tcf_proto __rcu **pprev;
+	struct tcf_proto __rcu *next;
+};
+
+static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain,
+					   struct tcf_chain_info *chain_info)
+{
+	return tcf_chain_dereference(*chain_info->pprev, chain);
+}
+
+static int tcf_chain_tp_insert(struct tcf_chain *chain,
+			       struct tcf_chain_info *chain_info,
+			       struct tcf_proto *tp)
+{
+	if (chain->flushing)
+		return -EAGAIN;
+
+	RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info));
+	if (*chain_info->pprev == chain->filter_chain)
+		tcf_chain0_head_change(chain, tp);
+	tcf_proto_get(tp);
+	rcu_assign_pointer(*chain_info->pprev, tp);
+
+	return 0;
+}
+
+static void tcf_chain_tp_remove(struct tcf_chain *chain,
+				struct tcf_chain_info *chain_info,
+				struct tcf_proto *tp)
+{
+	struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain);
+
+	tcf_proto_mark_delete(tp);
+	if (tp == chain->filter_chain)
+		tcf_chain0_head_change(chain, next);
+	RCU_INIT_POINTER(*chain_info->pprev, next);
+}
+
+static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
+					   struct tcf_chain_info *chain_info,
+					   u32 protocol, u32 prio,
+					   bool prio_allocate);
+
+/* Try to insert new proto.
+ * If proto with specified priority already exists, free new proto
+ * and return existing one.
+ */
+
+static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain,
+						    struct tcf_proto *tp_new,
+						    u32 protocol, u32 prio,
+						    bool rtnl_held)
+{
+	struct tcf_chain_info chain_info;
+	struct tcf_proto *tp;
+	int err = 0;
+
+	mutex_lock(&chain->filter_chain_lock);
+
+	if (tcf_proto_exists_destroying(chain, tp_new)) {
+		mutex_unlock(&chain->filter_chain_lock);
+		tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
+		return ERR_PTR(-EAGAIN);
+	}
+
+	tp = tcf_chain_tp_find(chain, &chain_info,
+			       protocol, prio, false);
+	if (!tp)
+		err = tcf_chain_tp_insert(chain, &chain_info, tp_new);
+	mutex_unlock(&chain->filter_chain_lock);
+
+	if (tp) {
+		tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
+		tp_new = tp;
+	} else if (err) {
+		tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
+		tp_new = ERR_PTR(err);
+	}
+
+	return tp_new;
+}
+
+static void tcf_chain_tp_delete_empty(struct tcf_chain *chain,
+				      struct tcf_proto *tp, bool rtnl_held,
+				      struct netlink_ext_ack *extack)
+{
+	struct tcf_chain_info chain_info;
+	struct tcf_proto *tp_iter;
+	struct tcf_proto **pprev;
+	struct tcf_proto *next;
+
+	mutex_lock(&chain->filter_chain_lock);
+
+	/* Atomically find and remove tp from chain. */
+	for (pprev = &chain->filter_chain;
+	     (tp_iter = tcf_chain_dereference(*pprev, chain));
+	     pprev = &tp_iter->next) {
+		if (tp_iter == tp) {
+			chain_info.pprev = pprev;
+			chain_info.next = tp_iter->next;
+			WARN_ON(tp_iter->deleting);
+			break;
+		}
+	}
+	/* Verify that tp still exists and no new filters were inserted
+	 * concurrently.
+	 * Mark tp for deletion if it is empty.
+	 */
+	if (!tp_iter || !tcf_proto_check_delete(tp)) {
+		mutex_unlock(&chain->filter_chain_lock);
+		return;
+	}
+
+	tcf_proto_signal_destroying(chain, tp);
+	next = tcf_chain_dereference(chain_info.next, chain);
+	if (tp == chain->filter_chain)
+		tcf_chain0_head_change(chain, next);
+	RCU_INIT_POINTER(*chain_info.pprev, next);
+	mutex_unlock(&chain->filter_chain_lock);
+
+	tcf_proto_put(tp, rtnl_held, extack);
+}
+
+static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
+					   struct tcf_chain_info *chain_info,
+					   u32 protocol, u32 prio,
+					   bool prio_allocate)
+{
+	struct tcf_proto **pprev;
+	struct tcf_proto *tp;
+
+	/* Check the chain for existence of proto-tcf with this priority */
+	for (pprev = &chain->filter_chain;
+	     (tp = tcf_chain_dereference(*pprev, chain));
+	     pprev = &tp->next) {
+		if (tp->prio >= prio) {
+			if (tp->prio == prio) {
+				if (prio_allocate ||
+				    (tp->protocol != protocol && protocol))
+					return ERR_PTR(-EINVAL);
+			} else {
+				tp = NULL;
+			}
+			break;
+		}
+	}
+	chain_info->pprev = pprev;
+	if (tp) {
+		chain_info->next = tp->next;
+		tcf_proto_get(tp);
+	} else {
+		chain_info->next = NULL;
+	}
+	return tp;
+}
+
+static int tcf_fill_node(struct net *net, struct sk_buff *skb,
+			 struct tcf_proto *tp, struct tcf_block *block,
+			 struct Qdisc *q, u32 parent, void *fh,
+			 u32 portid, u32 seq, u16 flags, int event,
+			 bool terse_dump, bool rtnl_held,
+			 struct netlink_ext_ack *extack)
+{
+	struct tcmsg *tcm;
+	struct nlmsghdr  *nlh;
+	unsigned char *b = skb_tail_pointer(skb);
+
+	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
+	if (!nlh)
+		goto out_nlmsg_trim;
+	tcm = nlmsg_data(nlh);
+	tcm->tcm_family = AF_UNSPEC;
+	tcm->tcm__pad1 = 0;
+	tcm->tcm__pad2 = 0;
+	if (q) {
+		tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
+		tcm->tcm_parent = parent;
+	} else {
+		tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
+		tcm->tcm_block_index = block->index;
+	}
+	tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
+	if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
+		goto nla_put_failure;
+	if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
+		goto nla_put_failure;
+	if (!fh) {
+		tcm->tcm_handle = 0;
+	} else if (terse_dump) {
+		if (tp->ops->terse_dump) {
+			if (tp->ops->terse_dump(net, tp, fh, skb, tcm,
+						rtnl_held) < 0)
+				goto nla_put_failure;
+		} else {
+			goto cls_op_not_supp;
+		}
+	} else {
+		if (tp->ops->dump &&
+		    tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0)
+			goto nla_put_failure;
+	}
+
+	if (extack && extack->_msg &&
+	    nla_put_string(skb, TCA_EXT_WARN_MSG, extack->_msg))
+		goto nla_put_failure;
+
+	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
+
+	return skb->len;
+
+out_nlmsg_trim:
+nla_put_failure:
+cls_op_not_supp:
+	nlmsg_trim(skb, b);
+	return -1;
+}
+
+static int tfilter_notify(struct net *net, struct sk_buff *oskb,
+			  struct nlmsghdr *n, struct tcf_proto *tp,
+			  struct tcf_block *block, struct Qdisc *q,
+			  u32 parent, void *fh, int event, bool unicast,
+			  bool rtnl_held, struct netlink_ext_ack *extack)
+{
+	struct sk_buff *skb;
+	u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
+	int err = 0;
+
+	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!skb)
+		return -ENOBUFS;
+
+	if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
+			  n->nlmsg_seq, n->nlmsg_flags, event,
+			  false, rtnl_held, extack) <= 0) {
+		kfree_skb(skb);
+		return -EINVAL;
+	}
+
+	if (unicast)
+		err = rtnl_unicast(skb, net, portid);
+	else
+		err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
+				     n->nlmsg_flags & NLM_F_ECHO);
+	return err;
+}
+
+static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
+			      struct nlmsghdr *n, struct tcf_proto *tp,
+			      struct tcf_block *block, struct Qdisc *q,
+			      u32 parent, void *fh, bool unicast, bool *last,
+			      bool rtnl_held, struct netlink_ext_ack *extack)
+{
+	struct sk_buff *skb;
+	u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
+	int err;
+
+	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!skb)
+		return -ENOBUFS;
+
+	if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
+			  n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER,
+			  false, rtnl_held, extack) <= 0) {
+		NL_SET_ERR_MSG(extack, "Failed to build del event notification");
+		kfree_skb(skb);
+		return -EINVAL;
+	}
+
+	err = tp->ops->delete(tp, fh, last, rtnl_held, extack);
+	if (err) {
+		kfree_skb(skb);
+		return err;
+	}
+
+	if (unicast)
+		err = rtnl_unicast(skb, net, portid);
+	else
+		err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
+				     n->nlmsg_flags & NLM_F_ECHO);
+	if (err < 0)
+		NL_SET_ERR_MSG(extack, "Failed to send filter delete notification");
+
+	return err;
+}
+
+static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
+				 struct tcf_block *block, struct Qdisc *q,
+				 u32 parent, struct nlmsghdr *n,
+				 struct tcf_chain *chain, int event,
+				 struct netlink_ext_ack *extack)
+{
+	struct tcf_proto *tp;
+
+	for (tp = tcf_get_next_proto(chain, NULL);
+	     tp; tp = tcf_get_next_proto(chain, tp))
+		tfilter_notify(net, oskb, n, tp, block, q, parent, NULL,
+			       event, false, true, extack);
+}
+
+static void tfilter_put(struct tcf_proto *tp, void *fh)
+{
+	if (tp->ops->put && fh)
+		tp->ops->put(tp, fh);
+}
+
+static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
+			  struct netlink_ext_ack *extack)
+{
+	struct net *net = sock_net(skb->sk);
+	struct nlattr *tca[TCA_MAX + 1];
+	char name[IFNAMSIZ];
+	struct tcmsg *t;
+	u32 protocol;
+	u32 prio;
+	bool prio_allocate;
+	u32 parent;
+	u32 chain_index;
+	struct Qdisc *q;
+	struct tcf_chain_info chain_info;
+	struct tcf_chain *chain;
+	struct tcf_block *block;
+	struct tcf_proto *tp;
+	unsigned long cl;
+	void *fh;
+	int err;
+	int tp_created;
+	bool rtnl_held = false;
+	u32 flags;
+
+replay:
+	tp_created = 0;
+
+	err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
+				     rtm_tca_policy, extack);
+	if (err < 0)
+		return err;
+
+	t = nlmsg_data(n);
+	protocol = TC_H_MIN(t->tcm_info);
+	prio = TC_H_MAJ(t->tcm_info);
+	prio_allocate = false;
+	parent = t->tcm_parent;
+	tp = NULL;
+	cl = 0;
+	block = NULL;
+	q = NULL;
+	chain = NULL;
+	flags = 0;
+
+	if (prio == 0) {
+		/* If no priority is provided by the user,
+		 * we allocate one.
+		 */
+		if (n->nlmsg_flags & NLM_F_CREATE) {
+			prio = TC_H_MAKE(0x80000000U, 0U);
+			prio_allocate = true;
+		} else {
+			NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
+			return -ENOENT;
+		}
+	}
+
+	/* Find head of filter chain. */
+
+	err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
+	if (err)
+		return err;
+
+	if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
+		NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
+		err = -EINVAL;
+		goto errout;
+	}
+
+	/* Take rtnl mutex if rtnl_held was set to true on previous iteration,
+	 * block is shared (no qdisc found), qdisc is not unlocked, classifier
+	 * type is not specified, classifier is not unlocked.
+	 */
+	if (rtnl_held ||
+	    (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
+	    !tcf_proto_is_unlocked(name)) {
+		rtnl_held = true;
+		rtnl_lock();
+	}
+
+	err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
+	if (err)
+		goto errout;
+
+	block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
+				 extack);
+	if (IS_ERR(block)) {
+		err = PTR_ERR(block);
+		goto errout;
+	}
+	block->classid = parent;
+
+	chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
+	if (chain_index > TC_ACT_EXT_VAL_MASK) {
+		NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
+		err = -EINVAL;
+		goto errout;
+	}
+	chain = tcf_chain_get(block, chain_index, true);
+	if (!chain) {
+		NL_SET_ERR_MSG(extack, "Cannot create specified filter chain");
+		err = -ENOMEM;
+		goto errout;
+	}
+
+	mutex_lock(&chain->filter_chain_lock);
+	tp = tcf_chain_tp_find(chain, &chain_info, protocol,
+			       prio, prio_allocate);
+	if (IS_ERR(tp)) {
+		NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
+		err = PTR_ERR(tp);
+		goto errout_locked;
+	}
+
+	if (tp == NULL) {
+		struct tcf_proto *tp_new = NULL;
+
+		if (chain->flushing) {
+			err = -EAGAIN;
+			goto errout_locked;
+		}
+
+		/* Proto-tcf does not exist, create new one */
+
+		if (tca[TCA_KIND] == NULL || !protocol) {
+			NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified");
+			err = -EINVAL;
+			goto errout_locked;
+		}
+
+		if (!(n->nlmsg_flags & NLM_F_CREATE)) {
+			NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
+			err = -ENOENT;
+			goto errout_locked;
+		}
+
+		if (prio_allocate)
+			prio = tcf_auto_prio(tcf_chain_tp_prev(chain,
+							       &chain_info));
+
+		mutex_unlock(&chain->filter_chain_lock);
+		tp_new = tcf_proto_create(name, protocol, prio, chain,
+					  rtnl_held, extack);
+		if (IS_ERR(tp_new)) {
+			err = PTR_ERR(tp_new);
+			goto errout_tp;
+		}
+
+		tp_created = 1;
+		tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio,
+						rtnl_held);
+		if (IS_ERR(tp)) {
+			err = PTR_ERR(tp);
+			goto errout_tp;
+		}
+	} else {
+		mutex_unlock(&chain->filter_chain_lock);
+	}
+
+	if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
+		NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
+		err = -EINVAL;
+		goto errout;
+	}
+
+	fh = tp->ops->get(tp, t->tcm_handle);
+
+	if (!fh) {
+		if (!(n->nlmsg_flags & NLM_F_CREATE)) {
+			NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
+			err = -ENOENT;
+			goto errout;
+		}
+	} else if (n->nlmsg_flags & NLM_F_EXCL) {
+		tfilter_put(tp, fh);
+		NL_SET_ERR_MSG(extack, "Filter already exists");
+		err = -EEXIST;
+		goto errout;
+	}
+
+	if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
+		tfilter_put(tp, fh);
+		NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
+		err = -EINVAL;
+		goto errout;
+	}
+
+	if (!(n->nlmsg_flags & NLM_F_CREATE))
+		flags |= TCA_ACT_FLAGS_REPLACE;
+	if (!rtnl_held)
+		flags |= TCA_ACT_FLAGS_NO_RTNL;
+	err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
+			      flags, extack);
+	if (err == 0) {
+		tfilter_notify(net, skb, n, tp, block, q, parent, fh,
+			       RTM_NEWTFILTER, false, rtnl_held, extack);
+		tfilter_put(tp, fh);
+		/* q pointer is NULL for shared blocks */
+		if (q)
+			q->flags &= ~TCQ_F_CAN_BYPASS;
+	}
+
+errout:
+	if (err && tp_created)
+		tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL);
+errout_tp:
+	if (chain) {
+		if (tp && !IS_ERR(tp))
+			tcf_proto_put(tp, rtnl_held, NULL);
+		if (!tp_created)
+			tcf_chain_put(chain);
+	}
+	tcf_block_release(q, block, rtnl_held);
+
+	if (rtnl_held)
+		rtnl_unlock();
+
+	if (err == -EAGAIN) {
+		/* Take rtnl lock in case EAGAIN is caused by concurrent flush
+		 * of target chain.
+		 */
+		rtnl_held = true;
+		/* Replay the request. */
+		goto replay;
+	}
+	return err;
+
+errout_locked:
+	mutex_unlock(&chain->filter_chain_lock);
+	goto errout;
+}
+
+static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
+			  struct netlink_ext_ack *extack)
+{
+	struct net *net = sock_net(skb->sk);
+	struct nlattr *tca[TCA_MAX + 1];
+	char name[IFNAMSIZ];
+	struct tcmsg *t;
+	u32 protocol;
+	u32 prio;
+	u32 parent;
+	u32 chain_index;
+	struct Qdisc *q = NULL;
+	struct tcf_chain_info chain_info;
+	struct tcf_chain *chain = NULL;
+	struct tcf_block *block = NULL;
+	struct tcf_proto *tp = NULL;
+	unsigned long cl = 0;
+	void *fh = NULL;
+	int err;
+	bool rtnl_held = false;
+
+	err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
+				     rtm_tca_policy, extack);
+	if (err < 0)
+		return err;
+
+	t = nlmsg_data(n);
+	protocol = TC_H_MIN(t->tcm_info);
+	prio = TC_H_MAJ(t->tcm_info);
+	parent = t->tcm_parent;
+
+	if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) {
+		NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set");
+		return -ENOENT;
+	}
+
+	/* Find head of filter chain. */
+
+	err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
+	if (err)
+		return err;
+
+	if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
+		NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
+		err = -EINVAL;
+		goto errout;
+	}
+	/* Take rtnl mutex if flushing whole chain, block is shared (no qdisc
+	 * found), qdisc is not unlocked, classifier type is not specified,
+	 * classifier is not unlocked.
+	 */
+	if (!prio ||
+	    (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
+	    !tcf_proto_is_unlocked(name)) {
+		rtnl_held = true;
+		rtnl_lock();
+	}
+
+	err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
+	if (err)
+		goto errout;
+
+	block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
+				 extack);
+	if (IS_ERR(block)) {
+		err = PTR_ERR(block);
+		goto errout;
+	}
+
+	chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
+	if (chain_index > TC_ACT_EXT_VAL_MASK) {
+		NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
+		err = -EINVAL;
+		goto errout;
+	}
+	chain = tcf_chain_get(block, chain_index, false);
+	if (!chain) {
+		/* User requested flush on non-existent chain. Nothing to do,
+		 * so just return success.
+		 */
+		if (prio == 0) {
+			err = 0;
+			goto errout;
+		}
+		NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
+		err = -ENOENT;
+		goto errout;
+	}
+
+	if (prio == 0) {
+		tfilter_notify_chain(net, skb, block, q, parent, n,
+				     chain, RTM_DELTFILTER, extack);
+		tcf_chain_flush(chain, rtnl_held);
+		err = 0;
+		goto errout;
+	}
+
+	mutex_lock(&chain->filter_chain_lock);
+	tp = tcf_chain_tp_find(chain, &chain_info, protocol,
+			       prio, false);
+	if (!tp || IS_ERR(tp)) {
+		NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
+		err = tp ? PTR_ERR(tp) : -ENOENT;
+		goto errout_locked;
+	} else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
+		NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
+		err = -EINVAL;
+		goto errout_locked;
+	} else if (t->tcm_handle == 0) {
+		tcf_proto_signal_destroying(chain, tp);
+		tcf_chain_tp_remove(chain, &chain_info, tp);
+		mutex_unlock(&chain->filter_chain_lock);
+
+		tcf_proto_put(tp, rtnl_held, NULL);
+		tfilter_notify(net, skb, n, tp, block, q, parent, fh,
+			       RTM_DELTFILTER, false, rtnl_held, extack);
+		err = 0;
+		goto errout;
+	}
+	mutex_unlock(&chain->filter_chain_lock);
+
+	fh = tp->ops->get(tp, t->tcm_handle);
+
+	if (!fh) {
+		NL_SET_ERR_MSG(extack, "Specified filter handle not found");
+		err = -ENOENT;
+	} else {
+		bool last;
+
+		err = tfilter_del_notify(net, skb, n, tp, block,
+					 q, parent, fh, false, &last,
+					 rtnl_held, extack);
+
+		if (err)
+			goto errout;
+		if (last)
+			tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack);
+	}
+
+errout:
+	if (chain) {
+		if (tp && !IS_ERR(tp))
+			tcf_proto_put(tp, rtnl_held, NULL);
+		tcf_chain_put(chain);
+	}
+	tcf_block_release(q, block, rtnl_held);
+
+	if (rtnl_held)
+		rtnl_unlock();
+
+	return err;
+
+errout_locked:
+	mutex_unlock(&chain->filter_chain_lock);
+	goto errout;
+}
+
+static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
+			  struct netlink_ext_ack *extack)
+{
+	struct net *net = sock_net(skb->sk);
+	struct nlattr *tca[TCA_MAX + 1];
+	char name[IFNAMSIZ];
+	struct tcmsg *t;
+	u32 protocol;
+	u32 prio;
+	u32 parent;
+	u32 chain_index;
+	struct Qdisc *q = NULL;
+	struct tcf_chain_info chain_info;
+	struct tcf_chain *chain = NULL;
+	struct tcf_block *block = NULL;
+	struct tcf_proto *tp = NULL;
+	unsigned long cl = 0;
+	void *fh = NULL;
+	int err;
+	bool rtnl_held = false;
+
+	err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
+				     rtm_tca_policy, extack);
+	if (err < 0)
+		return err;
+
+	t = nlmsg_data(n);
+	protocol = TC_H_MIN(t->tcm_info);
+	prio = TC_H_MAJ(t->tcm_info);
+	parent = t->tcm_parent;
+
+	if (prio == 0) {
+		NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
+		return -ENOENT;
+	}
+
+	/* Find head of filter chain. */
+
+	err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
+	if (err)
+		return err;
+
+	if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
+		NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
+		err = -EINVAL;
+		goto errout;
+	}
+	/* Take rtnl mutex if block is shared (no qdisc found), qdisc is not
+	 * unlocked, classifier type is not specified, classifier is not
+	 * unlocked.
+	 */
+	if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
+	    !tcf_proto_is_unlocked(name)) {
+		rtnl_held = true;
+		rtnl_lock();
+	}
+
+	err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
+	if (err)
+		goto errout;
+
+	block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
+				 extack);
+	if (IS_ERR(block)) {
+		err = PTR_ERR(block);
+		goto errout;
+	}
+
+	chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
+	if (chain_index > TC_ACT_EXT_VAL_MASK) {
+		NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
+		err = -EINVAL;
+		goto errout;
+	}
+	chain = tcf_chain_get(block, chain_index, false);
+	if (!chain) {
+		NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
+		err = -EINVAL;
+		goto errout;
+	}
+
+	mutex_lock(&chain->filter_chain_lock);
+	tp = tcf_chain_tp_find(chain, &chain_info, protocol,
+			       prio, false);
+	mutex_unlock(&chain->filter_chain_lock);
+	if (!tp || IS_ERR(tp)) {
+		NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
+		err = tp ? PTR_ERR(tp) : -ENOENT;
+		goto errout;
+	} else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
+		NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
+		err = -EINVAL;
+		goto errout;
+	}
+
+	fh = tp->ops->get(tp, t->tcm_handle);
+
+	if (!fh) {
+		NL_SET_ERR_MSG(extack, "Specified filter handle not found");
+		err = -ENOENT;
+	} else {
+		err = tfilter_notify(net, skb, n, tp, block, q, parent,
+				     fh, RTM_NEWTFILTER, true, rtnl_held, NULL);
+		if (err < 0)
+			NL_SET_ERR_MSG(extack, "Failed to send filter notify message");
+	}
+
+	tfilter_put(tp, fh);
+errout:
+	if (chain) {
+		if (tp && !IS_ERR(tp))
+			tcf_proto_put(tp, rtnl_held, NULL);
+		tcf_chain_put(chain);
+	}
+	tcf_block_release(q, block, rtnl_held);
+
+	if (rtnl_held)
+		rtnl_unlock();
+
+	return err;
+}
+
+struct tcf_dump_args {
+	struct tcf_walker w;
+	struct sk_buff *skb;
+	struct netlink_callback *cb;
+	struct tcf_block *block;
+	struct Qdisc *q;
+	u32 parent;
+	bool terse_dump;
+};
+
+static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
+{
+	struct tcf_dump_args *a = (void *)arg;
+	struct net *net = sock_net(a->skb->sk);
+
+	return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent,
+			     n, NETLINK_CB(a->cb->skb).portid,
+			     a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
+			     RTM_NEWTFILTER, a->terse_dump, true, NULL);
+}
+
+static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
+			   struct sk_buff *skb, struct netlink_callback *cb,
+			   long index_start, long *p_index, bool terse)
+{
+	struct net *net = sock_net(skb->sk);
+	struct tcf_block *block = chain->block;
+	struct tcmsg *tcm = nlmsg_data(cb->nlh);
+	struct tcf_proto *tp, *tp_prev;
+	struct tcf_dump_args arg;
+
+	for (tp = __tcf_get_next_proto(chain, NULL);
+	     tp;
+	     tp_prev = tp,
+		     tp = __tcf_get_next_proto(chain, tp),
+		     tcf_proto_put(tp_prev, true, NULL),
+		     (*p_index)++) {
+		if (*p_index < index_start)
+			continue;
+		if (TC_H_MAJ(tcm->tcm_info) &&
+		    TC_H_MAJ(tcm->tcm_info) != tp->prio)
+			continue;
+		if (TC_H_MIN(tcm->tcm_info) &&
+		    TC_H_MIN(tcm->tcm_info) != tp->protocol)
+			continue;
+		if (*p_index > index_start)
+			memset(&cb->args[1], 0,
+			       sizeof(cb->args) - sizeof(cb->args[0]));
+		if (cb->args[1] == 0) {
+			if (tcf_fill_node(net, skb, tp, block, q, parent, NULL,
+					  NETLINK_CB(cb->skb).portid,
+					  cb->nlh->nlmsg_seq, NLM_F_MULTI,
+					  RTM_NEWTFILTER, false, true, NULL) <= 0)
+				goto errout;
+			cb->args[1] = 1;
+		}
+		if (!tp->ops->walk)
+			continue;
+		arg.w.fn = tcf_node_dump;
+		arg.skb = skb;
+		arg.cb = cb;
+		arg.block = block;
+		arg.q = q;
+		arg.parent = parent;
+		arg.w.stop = 0;
+		arg.w.skip = cb->args[1] - 1;
+		arg.w.count = 0;
+		arg.w.cookie = cb->args[2];
+		arg.terse_dump = terse;
+		tp->ops->walk(tp, &arg.w, true);
+		cb->args[2] = arg.w.cookie;
+		cb->args[1] = arg.w.count + 1;
+		if (arg.w.stop)
+			goto errout;
+	}
+	return true;
+
+errout:
+	tcf_proto_put(tp, true, NULL);
+	return false;
+}
+
+static const struct nla_policy tcf_tfilter_dump_policy[TCA_MAX + 1] = {
+	[TCA_DUMP_FLAGS] = NLA_POLICY_BITFIELD32(TCA_DUMP_FLAGS_TERSE),
+};
+
+/* called with RTNL */
+static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct tcf_chain *chain, *chain_prev;
+	struct net *net = sock_net(skb->sk);
+	struct nlattr *tca[TCA_MAX + 1];
+	struct Qdisc *q = NULL;
+	struct tcf_block *block;
+	struct tcmsg *tcm = nlmsg_data(cb->nlh);
+	bool terse_dump = false;
+	long index_start;
+	long index;
+	u32 parent;
+	int err;
+
+	if (nlmsg_len(cb->nlh) < sizeof(*tcm))
+		return skb->len;
+
+	err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
+				     tcf_tfilter_dump_policy, cb->extack);
+	if (err)
+		return err;
+
+	if (tca[TCA_DUMP_FLAGS]) {
+		struct nla_bitfield32 flags =
+			nla_get_bitfield32(tca[TCA_DUMP_FLAGS]);
+
+		terse_dump = flags.value & TCA_DUMP_FLAGS_TERSE;
+	}
+
+	if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
+		block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
+		if (!block)
+			goto out;
+		/* If we work with block index, q is NULL and parent value
+		 * will never be used in the following code. The check
+		 * in tcf_fill_node prevents it. However, compiler does not
+		 * see that far, so set parent to zero to silence the warning
+		 * about parent being uninitialized.
+		 */
+		parent = 0;
+	} else {
+		const struct Qdisc_class_ops *cops;
+		struct net_device *dev;
+		unsigned long cl = 0;
+
+		dev = __dev_get_by_index(net, tcm->tcm_ifindex);
+		if (!dev)
+			return skb->len;
+
+		parent = tcm->tcm_parent;
+		if (!parent)
+			q = rtnl_dereference(dev->qdisc);
+		else
+			q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
+		if (!q)
+			goto out;
+		cops = q->ops->cl_ops;
+		if (!cops)
+			goto out;
+		if (!cops->tcf_block)
+			goto out;
+		if (TC_H_MIN(tcm->tcm_parent)) {
+			cl = cops->find(q, tcm->tcm_parent);
+			if (cl == 0)
+				goto out;
+		}
+		block = cops->tcf_block(q, cl, NULL);
+		if (!block)
+			goto out;
+		parent = block->classid;
+		if (tcf_block_shared(block))
+			q = NULL;
+	}
+
+	index_start = cb->args[0];
+	index = 0;
+
+	for (chain = __tcf_get_next_chain(block, NULL);
+	     chain;
+	     chain_prev = chain,
+		     chain = __tcf_get_next_chain(block, chain),
+		     tcf_chain_put(chain_prev)) {
+		if (tca[TCA_CHAIN] &&
+		    nla_get_u32(tca[TCA_CHAIN]) != chain->index)
+			continue;
+		if (!tcf_chain_dump(chain, q, parent, skb, cb,
+				    index_start, &index, terse_dump)) {
+			tcf_chain_put(chain);
+			err = -EMSGSIZE;
+			break;
+		}
+	}
+
+	if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
+		tcf_block_refcnt_put(block, true);
+	cb->args[0] = index;
+
+out:
+	/* If we did no progress, the error (EMSGSIZE) is real */
+	if (skb->len == 0 && err)
+		return err;
+	return skb->len;
+}
+
+static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops,
+			      void *tmplt_priv, u32 chain_index,
+			      struct net *net, struct sk_buff *skb,
+			      struct tcf_block *block,
+			      u32 portid, u32 seq, u16 flags, int event,
+			      struct netlink_ext_ack *extack)
+{
+	unsigned char *b = skb_tail_pointer(skb);
+	const struct tcf_proto_ops *ops;
+	struct nlmsghdr *nlh;
+	struct tcmsg *tcm;
+	void *priv;
+
+	ops = tmplt_ops;
+	priv = tmplt_priv;
+
+	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
+	if (!nlh)
+		goto out_nlmsg_trim;
+	tcm = nlmsg_data(nlh);
+	tcm->tcm_family = AF_UNSPEC;
+	tcm->tcm__pad1 = 0;
+	tcm->tcm__pad2 = 0;
+	tcm->tcm_handle = 0;
+	if (block->q) {
+		tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex;
+		tcm->tcm_parent = block->q->handle;
+	} else {
+		tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
+		tcm->tcm_block_index = block->index;
+	}
+
+	if (nla_put_u32(skb, TCA_CHAIN, chain_index))
+		goto nla_put_failure;
+
+	if (ops) {
+		if (nla_put_string(skb, TCA_KIND, ops->kind))
+			goto nla_put_failure;
+		if (ops->tmplt_dump(skb, net, priv) < 0)
+			goto nla_put_failure;
+	}
+
+	if (extack && extack->_msg &&
+	    nla_put_string(skb, TCA_EXT_WARN_MSG, extack->_msg))
+		goto out_nlmsg_trim;
+
+	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
+
+	return skb->len;
+
+out_nlmsg_trim:
+nla_put_failure:
+	nlmsg_trim(skb, b);
+	return -EMSGSIZE;
+}
+
+static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
+			   u32 seq, u16 flags, int event, bool unicast,
+			   struct netlink_ext_ack *extack)
+{
+	u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
+	struct tcf_block *block = chain->block;
+	struct net *net = block->net;
+	struct sk_buff *skb;
+	int err = 0;
+
+	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!skb)
+		return -ENOBUFS;
+
+	if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
+			       chain->index, net, skb, block, portid,
+			       seq, flags, event, extack) <= 0) {
+		kfree_skb(skb);
+		return -EINVAL;
+	}
+
+	if (unicast)
+		err = rtnl_unicast(skb, net, portid);
+	else
+		err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
+				     flags & NLM_F_ECHO);
+
+	return err;
+}
+
+static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
+				  void *tmplt_priv, u32 chain_index,
+				  struct tcf_block *block, struct sk_buff *oskb,
+				  u32 seq, u16 flags, bool unicast)
+{
+	u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
+	struct net *net = block->net;
+	struct sk_buff *skb;
+
+	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!skb)
+		return -ENOBUFS;
+
+	if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb,
+			       block, portid, seq, flags, RTM_DELCHAIN, NULL) <= 0) {
+		kfree_skb(skb);
+		return -EINVAL;
+	}
+
+	if (unicast)
+		return rtnl_unicast(skb, net, portid);
+
+	return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
+}
+
+static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
+			      struct nlattr **tca,
+			      struct netlink_ext_ack *extack)
+{
+	const struct tcf_proto_ops *ops;
+	char name[IFNAMSIZ];
+	void *tmplt_priv;
+
+	/* If kind is not set, user did not specify template. */
+	if (!tca[TCA_KIND])
+		return 0;
+
+	if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
+		NL_SET_ERR_MSG(extack, "Specified TC chain template name too long");
+		return -EINVAL;
+	}
+
+	ops = tcf_proto_lookup_ops(name, true, extack);
+	if (IS_ERR(ops))
+		return PTR_ERR(ops);
+	if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) {
+		NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
+		module_put(ops->owner);
+		return -EOPNOTSUPP;
+	}
+
+	tmplt_priv = ops->tmplt_create(net, chain, tca, extack);
+	if (IS_ERR(tmplt_priv)) {
+		module_put(ops->owner);
+		return PTR_ERR(tmplt_priv);
+	}
+	chain->tmplt_ops = ops;
+	chain->tmplt_priv = tmplt_priv;
+	return 0;
+}
+
+static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
+			       void *tmplt_priv)
+{
+	/* If template ops are set, no work to do for us. */
+	if (!tmplt_ops)
+		return;
+
+	tmplt_ops->tmplt_destroy(tmplt_priv);
+	module_put(tmplt_ops->owner);
+}
+
+/* Add/delete/get a chain */
+
+static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
+			struct netlink_ext_ack *extack)
+{
+	struct net *net = sock_net(skb->sk);
+	struct nlattr *tca[TCA_MAX + 1];
+	struct tcmsg *t;
+	u32 parent;
+	u32 chain_index;
+	struct Qdisc *q;
+	struct tcf_chain *chain;
+	struct tcf_block *block;
+	unsigned long cl;
+	int err;
+
+replay:
+	q = NULL;
+	err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
+				     rtm_tca_policy, extack);
+	if (err < 0)
+		return err;
+
+	t = nlmsg_data(n);
+	parent = t->tcm_parent;
+	cl = 0;
+
+	block = tcf_block_find(net, &q, &parent, &cl,
+			       t->tcm_ifindex, t->tcm_block_index, extack);
+	if (IS_ERR(block))
+		return PTR_ERR(block);
+
+	chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
+	if (chain_index > TC_ACT_EXT_VAL_MASK) {
+		NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
+		err = -EINVAL;
+		goto errout_block;
+	}
+
+	mutex_lock(&block->lock);
+	chain = tcf_chain_lookup(block, chain_index);
+	if (n->nlmsg_type == RTM_NEWCHAIN) {
+		if (chain) {
+			if (tcf_chain_held_by_acts_only(chain)) {
+				/* The chain exists only because there is
+				 * some action referencing it.
+				 */
+				tcf_chain_hold(chain);
+			} else {
+				NL_SET_ERR_MSG(extack, "Filter chain already exists");
+				err = -EEXIST;
+				goto errout_block_locked;
+			}
+		} else {
+			if (!(n->nlmsg_flags & NLM_F_CREATE)) {
+				NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
+				err = -ENOENT;
+				goto errout_block_locked;
+			}
+			chain = tcf_chain_create(block, chain_index);
+			if (!chain) {
+				NL_SET_ERR_MSG(extack, "Failed to create filter chain");
+				err = -ENOMEM;
+				goto errout_block_locked;
+			}
+		}
+	} else {
+		if (!chain || tcf_chain_held_by_acts_only(chain)) {
+			NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
+			err = -EINVAL;
+			goto errout_block_locked;
+		}
+		tcf_chain_hold(chain);
+	}
+
+	if (n->nlmsg_type == RTM_NEWCHAIN) {
+		/* Modifying chain requires holding parent block lock. In case
+		 * the chain was successfully added, take a reference to the
+		 * chain. This ensures that an empty chain does not disappear at
+		 * the end of this function.
+		 */
+		tcf_chain_hold(chain);
+		chain->explicitly_created = true;
+	}
+	mutex_unlock(&block->lock);
+
+	switch (n->nlmsg_type) {
+	case RTM_NEWCHAIN:
+		err = tc_chain_tmplt_add(chain, net, tca, extack);
+		if (err) {
+			tcf_chain_put_explicitly_created(chain);
+			goto errout;
+		}
+
+		tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
+				RTM_NEWCHAIN, false, extack);
+		break;
+	case RTM_DELCHAIN:
+		tfilter_notify_chain(net, skb, block, q, parent, n,
+				     chain, RTM_DELTFILTER, extack);
+		/* Flush the chain first as the user requested chain removal. */
+		tcf_chain_flush(chain, true);
+		/* In case the chain was successfully deleted, put a reference
+		 * to the chain previously taken during addition.
+		 */
+		tcf_chain_put_explicitly_created(chain);
+		break;
+	case RTM_GETCHAIN:
+		err = tc_chain_notify(chain, skb, n->nlmsg_seq,
+				      n->nlmsg_flags, n->nlmsg_type, true, extack);
+		if (err < 0)
+			NL_SET_ERR_MSG(extack, "Failed to send chain notify message");
+		break;
+	default:
+		err = -EOPNOTSUPP;
+		NL_SET_ERR_MSG(extack, "Unsupported message type");
+		goto errout;
+	}
+
+errout:
+	tcf_chain_put(chain);
+errout_block:
+	tcf_block_release(q, block, true);
+	if (err == -EAGAIN)
+		/* Replay the request. */
+		goto replay;
+	return err;
+
+errout_block_locked:
+	mutex_unlock(&block->lock);
+	goto errout_block;
+}
+
+/* called with RTNL */
+static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct net *net = sock_net(skb->sk);
+	struct nlattr *tca[TCA_MAX + 1];
+	struct Qdisc *q = NULL;
+	struct tcf_block *block;
+	struct tcmsg *tcm = nlmsg_data(cb->nlh);
+	struct tcf_chain *chain;
+	long index_start;
+	long index;
+	int err;
+
+	if (nlmsg_len(cb->nlh) < sizeof(*tcm))
+		return skb->len;
+
+	err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
+				     rtm_tca_policy, cb->extack);
+	if (err)
+		return err;
+
+	if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
+		block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
+		if (!block)
+			goto out;
+	} else {
+		const struct Qdisc_class_ops *cops;
+		struct net_device *dev;
+		unsigned long cl = 0;
+
+		dev = __dev_get_by_index(net, tcm->tcm_ifindex);
+		if (!dev)
+			return skb->len;
+
+		if (!tcm->tcm_parent)
+			q = rtnl_dereference(dev->qdisc);
+		else
+			q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
+
+		if (!q)
+			goto out;
+		cops = q->ops->cl_ops;
+		if (!cops)
+			goto out;
+		if (!cops->tcf_block)
+			goto out;
+		if (TC_H_MIN(tcm->tcm_parent)) {
+			cl = cops->find(q, tcm->tcm_parent);
+			if (cl == 0)
+				goto out;
+		}
+		block = cops->tcf_block(q, cl, NULL);
+		if (!block)
+			goto out;
+		if (tcf_block_shared(block))
+			q = NULL;
+	}
+
+	index_start = cb->args[0];
+	index = 0;
+
+	mutex_lock(&block->lock);
+	list_for_each_entry(chain, &block->chain_list, list) {
+		if ((tca[TCA_CHAIN] &&
+		     nla_get_u32(tca[TCA_CHAIN]) != chain->index))
+			continue;
+		if (index < index_start) {
+			index++;
+			continue;
+		}
+		if (tcf_chain_held_by_acts_only(chain))
+			continue;
+		err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
+					 chain->index, net, skb, block,
+					 NETLINK_CB(cb->skb).portid,
+					 cb->nlh->nlmsg_seq, NLM_F_MULTI,
+					 RTM_NEWCHAIN, NULL);
+		if (err <= 0)
+			break;
+		index++;
+	}
+	mutex_unlock(&block->lock);
+
+	if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
+		tcf_block_refcnt_put(block, true);
+	cb->args[0] = index;
+
+out:
+	/* If we did no progress, the error (EMSGSIZE) is real */
+	if (skb->len == 0 && err)
+		return err;
+	return skb->len;
+}
+
+void tcf_exts_destroy(struct tcf_exts *exts)
+{
+#ifdef CONFIG_NET_CLS_ACT
+	if (exts->actions) {
+		tcf_action_destroy(exts->actions, TCA_ACT_UNBIND);
+		kfree(exts->actions);
+	}
+	exts->nr_actions = 0;
+#endif
+}
+EXPORT_SYMBOL(tcf_exts_destroy);
+
+int tcf_exts_validate_ex(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
+			 struct nlattr *rate_tlv, struct tcf_exts *exts,
+			 u32 flags, u32 fl_flags, struct netlink_ext_ack *extack)
+{
+#ifdef CONFIG_NET_CLS_ACT
+	{
+		int init_res[TCA_ACT_MAX_PRIO] = {};
+		struct tc_action *act;
+		size_t attr_size = 0;
+
+		if (exts->police && tb[exts->police]) {
+			struct tc_action_ops *a_o;
+
+			a_o = tc_action_load_ops(tb[exts->police], true,
+						 !(flags & TCA_ACT_FLAGS_NO_RTNL),
+						 extack);
+			if (IS_ERR(a_o))
+				return PTR_ERR(a_o);
+			flags |= TCA_ACT_FLAGS_POLICE | TCA_ACT_FLAGS_BIND;
+			act = tcf_action_init_1(net, tp, tb[exts->police],
+						rate_tlv, a_o, init_res, flags,
+						extack);
+			module_put(a_o->owner);
+			if (IS_ERR(act))
+				return PTR_ERR(act);
+
+			act->type = exts->type = TCA_OLD_COMPAT;
+			exts->actions[0] = act;
+			exts->nr_actions = 1;
+			tcf_idr_insert_many(exts->actions);
+		} else if (exts->action && tb[exts->action]) {
+			int err;
+
+			flags |= TCA_ACT_FLAGS_BIND;
+			err = tcf_action_init(net, tp, tb[exts->action],
+					      rate_tlv, exts->actions, init_res,
+					      &attr_size, flags, fl_flags,
+					      extack);
+			if (err < 0)
+				return err;
+			exts->nr_actions = err;
+		}
+	}
+#else
+	if ((exts->action && tb[exts->action]) ||
+	    (exts->police && tb[exts->police])) {
+		NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
+		return -EOPNOTSUPP;
+	}
+#endif
+
+	return 0;
+}
+EXPORT_SYMBOL(tcf_exts_validate_ex);
+
+int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
+		      struct nlattr *rate_tlv, struct tcf_exts *exts,
+		      u32 flags, struct netlink_ext_ack *extack)
+{
+	return tcf_exts_validate_ex(net, tp, tb, rate_tlv, exts,
+				    flags, 0, extack);
+}
+EXPORT_SYMBOL(tcf_exts_validate);
+
+void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
+{
+#ifdef CONFIG_NET_CLS_ACT
+	struct tcf_exts old = *dst;
+
+	*dst = *src;
+	tcf_exts_destroy(&old);
+#endif
+}
+EXPORT_SYMBOL(tcf_exts_change);
+
+#ifdef CONFIG_NET_CLS_ACT
+static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
+{
+	if (exts->nr_actions == 0)
+		return NULL;
+	else
+		return exts->actions[0];
+}
+#endif
+
+int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
+{
+#ifdef CONFIG_NET_CLS_ACT
+	struct nlattr *nest;
+
+	if (exts->action && tcf_exts_has_actions(exts)) {
+		/*
+		 * again for backward compatible mode - we want
+		 * to work with both old and new modes of entering
+		 * tc data even if iproute2  was newer - jhs
+		 */
+		if (exts->type != TCA_OLD_COMPAT) {
+			nest = nla_nest_start_noflag(skb, exts->action);
+			if (nest == NULL)
+				goto nla_put_failure;
+
+			if (tcf_action_dump(skb, exts->actions, 0, 0, false)
+			    < 0)
+				goto nla_put_failure;
+			nla_nest_end(skb, nest);
+		} else if (exts->police) {
+			struct tc_action *act = tcf_exts_first_act(exts);
+			nest = nla_nest_start_noflag(skb, exts->police);
+			if (nest == NULL || !act)
+				goto nla_put_failure;
+			if (tcf_action_dump_old(skb, act, 0, 0) < 0)
+				goto nla_put_failure;
+			nla_nest_end(skb, nest);
+		}
+	}
+	return 0;
+
+nla_put_failure:
+	nla_nest_cancel(skb, nest);
+	return -1;
+#else
+	return 0;
+#endif
+}
+EXPORT_SYMBOL(tcf_exts_dump);
+
+int tcf_exts_terse_dump(struct sk_buff *skb, struct tcf_exts *exts)
+{
+#ifdef CONFIG_NET_CLS_ACT
+	struct nlattr *nest;
+
+	if (!exts->action || !tcf_exts_has_actions(exts))
+		return 0;
+
+	nest = nla_nest_start_noflag(skb, exts->action);
+	if (!nest)
+		goto nla_put_failure;
+
+	if (tcf_action_dump(skb, exts->actions, 0, 0, true) < 0)
+		goto nla_put_failure;
+	nla_nest_end(skb, nest);
+	return 0;
+
+nla_put_failure:
+	nla_nest_cancel(skb, nest);
+	return -1;
+#else
+	return 0;
+#endif
+}
+EXPORT_SYMBOL(tcf_exts_terse_dump);
+
+int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
+{
+#ifdef CONFIG_NET_CLS_ACT
+	struct tc_action *a = tcf_exts_first_act(exts);
+	if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
+		return -1;
+#endif
+	return 0;
+}
+EXPORT_SYMBOL(tcf_exts_dump_stats);
+
+static void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
+{
+	if (*flags & TCA_CLS_FLAGS_IN_HW)
+		return;
+	*flags |= TCA_CLS_FLAGS_IN_HW;
+	atomic_inc(&block->offloadcnt);
+}
+
+static void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
+{
+	if (!(*flags & TCA_CLS_FLAGS_IN_HW))
+		return;
+	*flags &= ~TCA_CLS_FLAGS_IN_HW;
+	atomic_dec(&block->offloadcnt);
+}
+
+static void tc_cls_offload_cnt_update(struct tcf_block *block,
+				      struct tcf_proto *tp, u32 *cnt,
+				      u32 *flags, u32 diff, bool add)
+{
+	lockdep_assert_held(&block->cb_lock);
+
+	spin_lock(&tp->lock);
+	if (add) {
+		if (!*cnt)
+			tcf_block_offload_inc(block, flags);
+		*cnt += diff;
+	} else {
+		*cnt -= diff;
+		if (!*cnt)
+			tcf_block_offload_dec(block, flags);
+	}
+	spin_unlock(&tp->lock);
+}
+
+static void
+tc_cls_offload_cnt_reset(struct tcf_block *block, struct tcf_proto *tp,
+			 u32 *cnt, u32 *flags)
+{
+	lockdep_assert_held(&block->cb_lock);
+
+	spin_lock(&tp->lock);
+	tcf_block_offload_dec(block, flags);
+	*cnt = 0;
+	spin_unlock(&tp->lock);
+}
+
+static int
+__tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
+		   void *type_data, bool err_stop)
+{
+	struct flow_block_cb *block_cb;
+	int ok_count = 0;
+	int err;
+
+	list_for_each_entry(block_cb, &block->flow_block.cb_list, list) {
+		err = block_cb->cb(type, type_data, block_cb->cb_priv);
+		if (err) {
+			if (err_stop)
+				return err;
+		} else {
+			ok_count++;
+		}
+	}
+	return ok_count;
+}
+
+int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
+		     void *type_data, bool err_stop, bool rtnl_held)
+{
+	bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
+	int ok_count;
+
+retry:
+	if (take_rtnl)
+		rtnl_lock();
+	down_read(&block->cb_lock);
+	/* Need to obtain rtnl lock if block is bound to devs that require it.
+	 * In block bind code cb_lock is obtained while holding rtnl, so we must
+	 * obtain the locks in same order here.
+	 */
+	if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
+		up_read(&block->cb_lock);
+		take_rtnl = true;
+		goto retry;
+	}
+
+	ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
+
+	up_read(&block->cb_lock);
+	if (take_rtnl)
+		rtnl_unlock();
+	return ok_count;
+}
+EXPORT_SYMBOL(tc_setup_cb_call);
+
+/* Non-destructive filter add. If filter that wasn't already in hardware is
+ * successfully offloaded, increment block offloads counter. On failure,
+ * previously offloaded filter is considered to be intact and offloads counter
+ * is not decremented.
+ */
+
+int tc_setup_cb_add(struct tcf_block *block, struct tcf_proto *tp,
+		    enum tc_setup_type type, void *type_data, bool err_stop,
+		    u32 *flags, unsigned int *in_hw_count, bool rtnl_held)
+{
+	bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
+	int ok_count;
+
+retry:
+	if (take_rtnl)
+		rtnl_lock();
+	down_read(&block->cb_lock);
+	/* Need to obtain rtnl lock if block is bound to devs that require it.
+	 * In block bind code cb_lock is obtained while holding rtnl, so we must
+	 * obtain the locks in same order here.
+	 */
+	if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
+		up_read(&block->cb_lock);
+		take_rtnl = true;
+		goto retry;
+	}
+
+	/* Make sure all netdevs sharing this block are offload-capable. */
+	if (block->nooffloaddevcnt && err_stop) {
+		ok_count = -EOPNOTSUPP;
+		goto err_unlock;
+	}
+
+	ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
+	if (ok_count < 0)
+		goto err_unlock;
+
+	if (tp->ops->hw_add)
+		tp->ops->hw_add(tp, type_data);
+	if (ok_count > 0)
+		tc_cls_offload_cnt_update(block, tp, in_hw_count, flags,
+					  ok_count, true);
+err_unlock:
+	up_read(&block->cb_lock);
+	if (take_rtnl)
+		rtnl_unlock();
+	return min(ok_count, 0);
+}
+EXPORT_SYMBOL(tc_setup_cb_add);
+
+/* Destructive filter replace. If filter that wasn't already in hardware is
+ * successfully offloaded, increment block offload counter. On failure,
+ * previously offloaded filter is considered to be destroyed and offload counter
+ * is decremented.
+ */
+
+int tc_setup_cb_replace(struct tcf_block *block, struct tcf_proto *tp,
+			enum tc_setup_type type, void *type_data, bool err_stop,
+			u32 *old_flags, unsigned int *old_in_hw_count,
+			u32 *new_flags, unsigned int *new_in_hw_count,
+			bool rtnl_held)
+{
+	bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
+	int ok_count;
+
+retry:
+	if (take_rtnl)
+		rtnl_lock();
+	down_read(&block->cb_lock);
+	/* Need to obtain rtnl lock if block is bound to devs that require it.
+	 * In block bind code cb_lock is obtained while holding rtnl, so we must
+	 * obtain the locks in same order here.
+	 */
+	if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
+		up_read(&block->cb_lock);
+		take_rtnl = true;
+		goto retry;
+	}
+
+	/* Make sure all netdevs sharing this block are offload-capable. */
+	if (block->nooffloaddevcnt && err_stop) {
+		ok_count = -EOPNOTSUPP;
+		goto err_unlock;
+	}
+
+	tc_cls_offload_cnt_reset(block, tp, old_in_hw_count, old_flags);
+	if (tp->ops->hw_del)
+		tp->ops->hw_del(tp, type_data);
+
+	ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
+	if (ok_count < 0)
+		goto err_unlock;
+
+	if (tp->ops->hw_add)
+		tp->ops->hw_add(tp, type_data);
+	if (ok_count > 0)
+		tc_cls_offload_cnt_update(block, tp, new_in_hw_count,
+					  new_flags, ok_count, true);
+err_unlock:
+	up_read(&block->cb_lock);
+	if (take_rtnl)
+		rtnl_unlock();
+	return min(ok_count, 0);
+}
+EXPORT_SYMBOL(tc_setup_cb_replace);
+
+/* Destroy filter and decrement block offload counter, if filter was previously
+ * offloaded.
+ */
+
+int tc_setup_cb_destroy(struct tcf_block *block, struct tcf_proto *tp,
+			enum tc_setup_type type, void *type_data, bool err_stop,
+			u32 *flags, unsigned int *in_hw_count, bool rtnl_held)
+{
+	bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
+	int ok_count;
+
+retry:
+	if (take_rtnl)
+		rtnl_lock();
+	down_read(&block->cb_lock);
+	/* Need to obtain rtnl lock if block is bound to devs that require it.
+	 * In block bind code cb_lock is obtained while holding rtnl, so we must
+	 * obtain the locks in same order here.
+	 */
+	if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
+		up_read(&block->cb_lock);
+		take_rtnl = true;
+		goto retry;
+	}
+
+	ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
+
+	tc_cls_offload_cnt_reset(block, tp, in_hw_count, flags);
+	if (tp->ops->hw_del)
+		tp->ops->hw_del(tp, type_data);
+
+	up_read(&block->cb_lock);
+	if (take_rtnl)
+		rtnl_unlock();
+	return min(ok_count, 0);
+}
+EXPORT_SYMBOL(tc_setup_cb_destroy);
+
+int tc_setup_cb_reoffload(struct tcf_block *block, struct tcf_proto *tp,
+			  bool add, flow_setup_cb_t *cb,
+			  enum tc_setup_type type, void *type_data,
+			  void *cb_priv, u32 *flags, unsigned int *in_hw_count)
+{
+	int err = cb(type, type_data, cb_priv);
+
+	if (err) {
+		if (add && tc_skip_sw(*flags))
+			return err;
+	} else {
+		tc_cls_offload_cnt_update(block, tp, in_hw_count, flags, 1,
+					  add);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(tc_setup_cb_reoffload);
+
+static int tcf_act_get_cookie(struct flow_action_entry *entry,
+			      const struct tc_action *act)
+{
+	struct tc_cookie *cookie;
+	int err = 0;
+
+	rcu_read_lock();
+	cookie = rcu_dereference(act->act_cookie);
+	if (cookie) {
+		entry->cookie = flow_action_cookie_create(cookie->data,
+							  cookie->len,
+							  GFP_ATOMIC);
+		if (!entry->cookie)
+			err = -ENOMEM;
+	}
+	rcu_read_unlock();
+	return err;
+}
+
+static void tcf_act_put_cookie(struct flow_action_entry *entry)
+{
+	flow_action_cookie_destroy(entry->cookie);
+}
+
+void tc_cleanup_offload_action(struct flow_action *flow_action)
+{
+	struct flow_action_entry *entry;
+	int i;
+
+	flow_action_for_each(i, entry, flow_action) {
+		tcf_act_put_cookie(entry);
+		if (entry->destructor)
+			entry->destructor(entry->destructor_priv);
+	}
+}
+EXPORT_SYMBOL(tc_cleanup_offload_action);
+
+static int tc_setup_offload_act(struct tc_action *act,
+				struct flow_action_entry *entry,
+				u32 *index_inc,
+				struct netlink_ext_ack *extack)
+{
+#ifdef CONFIG_NET_CLS_ACT
+	if (act->ops->offload_act_setup) {
+		return act->ops->offload_act_setup(act, entry, index_inc, true,
+						   extack);
+	} else {
+		NL_SET_ERR_MSG(extack, "Action does not support offload");
+		return -EOPNOTSUPP;
+	}
+#else
+	return 0;
+#endif
+}
+
+int tc_setup_action(struct flow_action *flow_action,
+		    struct tc_action *actions[],
+		    struct netlink_ext_ack *extack)
+{
+	int i, j, k, index, err = 0;
+	struct tc_action *act;
+
+	BUILD_BUG_ON(TCA_ACT_HW_STATS_ANY != FLOW_ACTION_HW_STATS_ANY);
+	BUILD_BUG_ON(TCA_ACT_HW_STATS_IMMEDIATE != FLOW_ACTION_HW_STATS_IMMEDIATE);
+	BUILD_BUG_ON(TCA_ACT_HW_STATS_DELAYED != FLOW_ACTION_HW_STATS_DELAYED);
+
+	if (!actions)
+		return 0;
+
+	j = 0;
+	tcf_act_for_each_action(i, act, actions) {
+		struct flow_action_entry *entry;
+
+		entry = &flow_action->entries[j];
+		spin_lock_bh(&act->tcfa_lock);
+		err = tcf_act_get_cookie(entry, act);
+		if (err)
+			goto err_out_locked;
+
+		index = 0;
+		err = tc_setup_offload_act(act, entry, &index, extack);
+		if (err)
+			goto err_out_locked;
+
+		for (k = 0; k < index ; k++) {
+			entry[k].hw_stats = tc_act_hw_stats(act->hw_stats);
+			entry[k].hw_index = act->tcfa_index;
+		}
+
+		j += index;
+
+		spin_unlock_bh(&act->tcfa_lock);
+	}
+
+err_out:
+	if (err)
+		tc_cleanup_offload_action(flow_action);
+
+	return err;
+err_out_locked:
+	spin_unlock_bh(&act->tcfa_lock);
+	goto err_out;
+}
+
+int tc_setup_offload_action(struct flow_action *flow_action,
+			    const struct tcf_exts *exts,
+			    struct netlink_ext_ack *extack)
+{
+#ifdef CONFIG_NET_CLS_ACT
+	if (!exts)
+		return 0;
+
+	return tc_setup_action(flow_action, exts->actions, extack);
+#else
+	return 0;
+#endif
+}
+EXPORT_SYMBOL(tc_setup_offload_action);
+
+unsigned int tcf_exts_num_actions(struct tcf_exts *exts)
+{
+	unsigned int num_acts = 0;
+	struct tc_action *act;
+	int i;
+
+	tcf_exts_for_each_action(i, act, exts) {
+		if (is_tcf_pedit(act))
+			num_acts += tcf_pedit_nkeys(act);
+		else
+			num_acts++;
+	}
+	return num_acts;
+}
+EXPORT_SYMBOL(tcf_exts_num_actions);
+
+#ifdef CONFIG_NET_CLS_ACT
+static int tcf_qevent_parse_block_index(struct nlattr *block_index_attr,
+					u32 *p_block_index,
+					struct netlink_ext_ack *extack)
+{
+	*p_block_index = nla_get_u32(block_index_attr);
+	if (!*p_block_index) {
+		NL_SET_ERR_MSG(extack, "Block number may not be zero");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int tcf_qevent_init(struct tcf_qevent *qe, struct Qdisc *sch,
+		    enum flow_block_binder_type binder_type,
+		    struct nlattr *block_index_attr,
+		    struct netlink_ext_ack *extack)
+{
+	u32 block_index;
+	int err;
+
+	if (!block_index_attr)
+		return 0;
+
+	err = tcf_qevent_parse_block_index(block_index_attr, &block_index, extack);
+	if (err)
+		return err;
+
+	qe->info.binder_type = binder_type;
+	qe->info.chain_head_change = tcf_chain_head_change_dflt;
+	qe->info.chain_head_change_priv = &qe->filter_chain;
+	qe->info.block_index = block_index;
+
+	return tcf_block_get_ext(&qe->block, sch, &qe->info, extack);
+}
+EXPORT_SYMBOL(tcf_qevent_init);
+
+void tcf_qevent_destroy(struct tcf_qevent *qe, struct Qdisc *sch)
+{
+	if (qe->info.block_index)
+		tcf_block_put_ext(qe->block, sch, &qe->info);
+}
+EXPORT_SYMBOL(tcf_qevent_destroy);
+
+int tcf_qevent_validate_change(struct tcf_qevent *qe, struct nlattr *block_index_attr,
+			       struct netlink_ext_ack *extack)
+{
+	u32 block_index;
+	int err;
+
+	if (!block_index_attr)
+		return 0;
+
+	err = tcf_qevent_parse_block_index(block_index_attr, &block_index, extack);
+	if (err)
+		return err;
+
+	/* Bounce newly-configured block or change in block. */
+	if (block_index != qe->info.block_index) {
+		NL_SET_ERR_MSG(extack, "Change of blocks is not supported");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(tcf_qevent_validate_change);
+
+struct sk_buff *tcf_qevent_handle(struct tcf_qevent *qe, struct Qdisc *sch, struct sk_buff *skb,
+				  struct sk_buff **to_free, int *ret)
+{
+	struct tcf_result cl_res;
+	struct tcf_proto *fl;
+
+	if (!qe->info.block_index)
+		return skb;
+
+	fl = rcu_dereference_bh(qe->filter_chain);
+
+	switch (tcf_classify(skb, NULL, fl, &cl_res, false)) {
+	case TC_ACT_SHOT:
+		qdisc_qstats_drop(sch);
+		__qdisc_drop(skb, to_free);
+		*ret = __NET_XMIT_BYPASS;
+		return NULL;
+	case TC_ACT_STOLEN:
+	case TC_ACT_QUEUED:
+	case TC_ACT_TRAP:
+		__qdisc_drop(skb, to_free);
+		*ret = __NET_XMIT_STOLEN;
+		return NULL;
+	case TC_ACT_REDIRECT:
+		skb_do_redirect(skb);
+		*ret = __NET_XMIT_STOLEN;
+		return NULL;
+	}
+
+	return skb;
+}
+EXPORT_SYMBOL(tcf_qevent_handle);
+
+int tcf_qevent_dump(struct sk_buff *skb, int attr_name, struct tcf_qevent *qe)
+{
+	if (!qe->info.block_index)
+		return 0;
+	return nla_put_u32(skb, attr_name, qe->info.block_index);
+}
+EXPORT_SYMBOL(tcf_qevent_dump);
+#endif
+
+static __net_init int tcf_net_init(struct net *net)
+{
+	struct tcf_net *tn = net_generic(net, tcf_net_id);
+
+	spin_lock_init(&tn->idr_lock);
+	idr_init(&tn->idr);
+	return 0;
+}
+
+static void __net_exit tcf_net_exit(struct net *net)
+{
+	struct tcf_net *tn = net_generic(net, tcf_net_id);
+
+	idr_destroy(&tn->idr);
+}
+
+static struct pernet_operations tcf_net_ops = {
+	.init = tcf_net_init,
+	.exit = tcf_net_exit,
+	.id   = &tcf_net_id,
+	.size = sizeof(struct tcf_net),
+};
+
+static int __init tc_filter_init(void)
+{
+	int err;
+
+	tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
+	if (!tc_filter_wq)
+		return -ENOMEM;
+
+	err = register_pernet_subsys(&tcf_net_ops);
+	if (err)
+		goto err_register_pernet_subsys;
+
+	rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL,
+		      RTNL_FLAG_DOIT_UNLOCKED);
+	rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL,
+		      RTNL_FLAG_DOIT_UNLOCKED);
+	rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter,
+		      tc_dump_tfilter, RTNL_FLAG_DOIT_UNLOCKED);
+	rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0);
+	rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0);
+	rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain,
+		      tc_dump_chain, 0);
+
+	return 0;
+
+err_register_pernet_subsys:
+	destroy_workqueue(tc_filter_wq);
+	return err;
+}
+
+subsys_initcall(tc_filter_init);