Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 1705 insertions, 0 deletions

diff --git a/net/sched/act_api.c b/net/sched/act_api.c
new file mode 100644
index 000000000..4ab9c2a6f
--- /dev/null
+++ b/net/sched/act_api.c
@@ -0,0 +1,1705 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * net/sched/act_api.c	Packet action API.
+ *
+ * Author:	Jamal Hadi Salim
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/kmod.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <net/net_namespace.h>
+#include <net/sock.h>
+#include <net/sch_generic.h>
+#include <net/pkt_cls.h>
+#include <net/act_api.h>
+#include <net/netlink.h>
+
+static void tcf_action_goto_chain_exec(const struct tc_action *a,
+				       struct tcf_result *res)
+{
+	const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
+
+	res->goto_tp = rcu_dereference_bh(chain->filter_chain);
+}
+
+static void tcf_free_cookie_rcu(struct rcu_head *p)
+{
+	struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
+
+	kfree(cookie->data);
+	kfree(cookie);
+}
+
+static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
+				  struct tc_cookie *new_cookie)
+{
+	struct tc_cookie *old;
+
+	old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
+	if (old)
+		call_rcu(&old->rcu, tcf_free_cookie_rcu);
+}
+
+int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
+			     struct tcf_chain **newchain,
+			     struct netlink_ext_ack *extack)
+{
+	int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
+	u32 chain_index;
+
+	if (!opcode)
+		ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
+	else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
+		ret = 0;
+	if (ret) {
+		NL_SET_ERR_MSG(extack, "invalid control action");
+		goto end;
+	}
+
+	if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
+		chain_index = action & TC_ACT_EXT_VAL_MASK;
+		if (!tp || !newchain) {
+			ret = -EINVAL;
+			NL_SET_ERR_MSG(extack,
+				       "can't goto NULL proto/chain");
+			goto end;
+		}
+		*newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
+		if (!*newchain) {
+			ret = -ENOMEM;
+			NL_SET_ERR_MSG(extack,
+				       "can't allocate goto_chain");
+		}
+	}
+end:
+	return ret;
+}
+EXPORT_SYMBOL(tcf_action_check_ctrlact);
+
+struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
+					 struct tcf_chain *goto_chain)
+{
+	a->tcfa_action = action;
+	goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
+	return goto_chain;
+}
+EXPORT_SYMBOL(tcf_action_set_ctrlact);
+
+/* XXX: For standalone actions, we don't need a RCU grace period either, because
+ * actions are always connected to filters and filters are already destroyed in
+ * RCU callbacks, so after a RCU grace period actions are already disconnected
+ * from filters. Readers later can not find us.
+ */
+static void free_tcf(struct tc_action *p)
+{
+	struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
+
+	free_percpu(p->cpu_bstats);
+	free_percpu(p->cpu_bstats_hw);
+	free_percpu(p->cpu_qstats);
+
+	tcf_set_action_cookie(&p->act_cookie, NULL);
+	if (chain)
+		tcf_chain_put_by_act(chain);
+
+	kfree(p);
+}
+
+static void tcf_action_cleanup(struct tc_action *p)
+{
+	if (p->ops->cleanup)
+		p->ops->cleanup(p);
+
+	gen_kill_estimator(&p->tcfa_rate_est);
+	free_tcf(p);
+}
+
+static int __tcf_action_put(struct tc_action *p, bool bind)
+{
+	struct tcf_idrinfo *idrinfo = p->idrinfo;
+
+	if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
+		if (bind)
+			atomic_dec(&p->tcfa_bindcnt);
+		idr_remove(&idrinfo->action_idr, p->tcfa_index);
+		mutex_unlock(&idrinfo->lock);
+
+		tcf_action_cleanup(p);
+		return 1;
+	}
+
+	if (bind)
+		atomic_dec(&p->tcfa_bindcnt);
+
+	return 0;
+}
+
+static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
+{
+	int ret = 0;
+
+	/* Release with strict==1 and bind==0 is only called through act API
+	 * interface (classifiers always bind). Only case when action with
+	 * positive reference count and zero bind count can exist is when it was
+	 * also created with act API (unbinding last classifier will destroy the
+	 * action if it was created by classifier). So only case when bind count
+	 * can be changed after initial check is when unbound action is
+	 * destroyed by act API while classifier binds to action with same id
+	 * concurrently. This result either creation of new action(same behavior
+	 * as before), or reusing existing action if concurrent process
+	 * increments reference count before action is deleted. Both scenarios
+	 * are acceptable.
+	 */
+	if (p) {
+		if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
+			return -EPERM;
+
+		if (__tcf_action_put(p, bind))
+			ret = ACT_P_DELETED;
+	}
+
+	return ret;
+}
+
+int tcf_idr_release(struct tc_action *a, bool bind)
+{
+	const struct tc_action_ops *ops = a->ops;
+	int ret;
+
+	ret = __tcf_idr_release(a, bind, false);
+	if (ret == ACT_P_DELETED)
+		module_put(ops->owner);
+	return ret;
+}
+EXPORT_SYMBOL(tcf_idr_release);
+
+static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
+{
+	struct tc_cookie *act_cookie;
+	u32 cookie_len = 0;
+
+	rcu_read_lock();
+	act_cookie = rcu_dereference(act->act_cookie);
+
+	if (act_cookie)
+		cookie_len = nla_total_size(act_cookie->len);
+	rcu_read_unlock();
+
+	return  nla_total_size(0) /* action number nested */
+		+ nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
+		+ cookie_len /* TCA_ACT_COOKIE */
+		+ nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
+		+ nla_total_size(0) /* TCA_ACT_STATS nested */
+		+ nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
+		/* TCA_STATS_BASIC */
+		+ nla_total_size_64bit(sizeof(struct gnet_stats_basic))
+		/* TCA_STATS_PKT64 */
+		+ nla_total_size_64bit(sizeof(u64))
+		/* TCA_STATS_QUEUE */
+		+ nla_total_size_64bit(sizeof(struct gnet_stats_queue))
+		+ nla_total_size(0) /* TCA_OPTIONS nested */
+		+ nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
+}
+
+static size_t tcf_action_full_attrs_size(size_t sz)
+{
+	return NLMSG_HDRLEN                     /* struct nlmsghdr */
+		+ sizeof(struct tcamsg)
+		+ nla_total_size(0)             /* TCA_ACT_TAB nested */
+		+ sz;
+}
+
+static size_t tcf_action_fill_size(const struct tc_action *act)
+{
+	size_t sz = tcf_action_shared_attrs_size(act);
+
+	if (act->ops->get_fill_size)
+		return act->ops->get_fill_size(act) + sz;
+	return sz;
+}
+
+static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
+			   struct netlink_callback *cb)
+{
+	int err = 0, index = -1, s_i = 0, n_i = 0;
+	u32 act_flags = cb->args[2];
+	unsigned long jiffy_since = cb->args[3];
+	struct nlattr *nest;
+	struct idr *idr = &idrinfo->action_idr;
+	struct tc_action *p;
+	unsigned long id = 1;
+	unsigned long tmp;
+
+	mutex_lock(&idrinfo->lock);
+
+	s_i = cb->args[0];
+
+	idr_for_each_entry_ul(idr, p, tmp, id) {
+		index++;
+		if (index < s_i)
+			continue;
+		if (IS_ERR(p))
+			continue;
+
+		if (jiffy_since &&
+		    time_after(jiffy_since,
+			       (unsigned long)p->tcfa_tm.lastuse))
+			continue;
+
+		nest = nla_nest_start_noflag(skb, n_i);
+		if (!nest) {
+			index--;
+			goto nla_put_failure;
+		}
+		err = tcf_action_dump_1(skb, p, 0, 0);
+		if (err < 0) {
+			index--;
+			nlmsg_trim(skb, nest);
+			goto done;
+		}
+		nla_nest_end(skb, nest);
+		n_i++;
+		if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
+		    n_i >= TCA_ACT_MAX_PRIO)
+			goto done;
+	}
+done:
+	if (index >= 0)
+		cb->args[0] = index + 1;
+
+	mutex_unlock(&idrinfo->lock);
+	if (n_i) {
+		if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
+			cb->args[1] = n_i;
+	}
+	return n_i;
+
+nla_put_failure:
+	nla_nest_cancel(skb, nest);
+	goto done;
+}
+
+static int tcf_idr_release_unsafe(struct tc_action *p)
+{
+	if (atomic_read(&p->tcfa_bindcnt) > 0)
+		return -EPERM;
+
+	if (refcount_dec_and_test(&p->tcfa_refcnt)) {
+		idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
+		tcf_action_cleanup(p);
+		return ACT_P_DELETED;
+	}
+
+	return 0;
+}
+
+static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
+			  const struct tc_action_ops *ops,
+			  struct netlink_ext_ack *extack)
+{
+	struct nlattr *nest;
+	int n_i = 0;
+	int ret = -EINVAL;
+	struct idr *idr = &idrinfo->action_idr;
+	struct tc_action *p;
+	unsigned long id = 1;
+	unsigned long tmp;
+
+	nest = nla_nest_start_noflag(skb, 0);
+	if (nest == NULL)
+		goto nla_put_failure;
+	if (nla_put_string(skb, TCA_KIND, ops->kind))
+		goto nla_put_failure;
+
+	ret = 0;
+	mutex_lock(&idrinfo->lock);
+	idr_for_each_entry_ul(idr, p, tmp, id) {
+		if (IS_ERR(p))
+			continue;
+		ret = tcf_idr_release_unsafe(p);
+		if (ret == ACT_P_DELETED)
+			module_put(ops->owner);
+		else if (ret < 0)
+			break;
+		n_i++;
+	}
+	mutex_unlock(&idrinfo->lock);
+	if (ret < 0) {
+		if (n_i)
+			NL_SET_ERR_MSG(extack, "Unable to flush all TC actions");
+		else
+			goto nla_put_failure;
+	}
+
+	ret = nla_put_u32(skb, TCA_FCNT, n_i);
+	if (ret)
+		goto nla_put_failure;
+	nla_nest_end(skb, nest);
+
+	return n_i;
+nla_put_failure:
+	nla_nest_cancel(skb, nest);
+	return ret;
+}
+
+int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
+		       struct netlink_callback *cb, int type,
+		       const struct tc_action_ops *ops,
+		       struct netlink_ext_ack *extack)
+{
+	struct tcf_idrinfo *idrinfo = tn->idrinfo;
+
+	if (type == RTM_DELACTION) {
+		return tcf_del_walker(idrinfo, skb, ops, extack);
+	} else if (type == RTM_GETACTION) {
+		return tcf_dump_walker(idrinfo, skb, cb);
+	} else {
+		WARN(1, "tcf_generic_walker: unknown command %d\n", type);
+		NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
+		return -EINVAL;
+	}
+}
+EXPORT_SYMBOL(tcf_generic_walker);
+
+int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
+{
+	struct tcf_idrinfo *idrinfo = tn->idrinfo;
+	struct tc_action *p;
+
+	mutex_lock(&idrinfo->lock);
+	p = idr_find(&idrinfo->action_idr, index);
+	if (IS_ERR(p))
+		p = NULL;
+	else if (p)
+		refcount_inc(&p->tcfa_refcnt);
+	mutex_unlock(&idrinfo->lock);
+
+	if (p) {
+		*a = p;
+		return true;
+	}
+	return false;
+}
+EXPORT_SYMBOL(tcf_idr_search);
+
+static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
+{
+	struct tc_action *p;
+	int ret = 0;
+
+	mutex_lock(&idrinfo->lock);
+	p = idr_find(&idrinfo->action_idr, index);
+	if (!p) {
+		mutex_unlock(&idrinfo->lock);
+		return -ENOENT;
+	}
+
+	if (!atomic_read(&p->tcfa_bindcnt)) {
+		if (refcount_dec_and_test(&p->tcfa_refcnt)) {
+			struct module *owner = p->ops->owner;
+
+			WARN_ON(p != idr_remove(&idrinfo->action_idr,
+						p->tcfa_index));
+			mutex_unlock(&idrinfo->lock);
+
+			tcf_action_cleanup(p);
+			module_put(owner);
+			return 0;
+		}
+		ret = 0;
+	} else {
+		ret = -EPERM;
+	}
+
+	mutex_unlock(&idrinfo->lock);
+	return ret;
+}
+
+int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
+		   struct tc_action **a, const struct tc_action_ops *ops,
+		   int bind, bool cpustats, u32 flags)
+{
+	struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
+	struct tcf_idrinfo *idrinfo = tn->idrinfo;
+	int err = -ENOMEM;
+
+	if (unlikely(!p))
+		return -ENOMEM;
+	refcount_set(&p->tcfa_refcnt, 1);
+	if (bind)
+		atomic_set(&p->tcfa_bindcnt, 1);
+
+	if (cpustats) {
+		p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
+		if (!p->cpu_bstats)
+			goto err1;
+		p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
+		if (!p->cpu_bstats_hw)
+			goto err2;
+		p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
+		if (!p->cpu_qstats)
+			goto err3;
+	}
+	spin_lock_init(&p->tcfa_lock);
+	p->tcfa_index = index;
+	p->tcfa_tm.install = jiffies;
+	p->tcfa_tm.lastuse = jiffies;
+	p->tcfa_tm.firstuse = 0;
+	p->tcfa_flags = flags;
+	if (est) {
+		err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
+					&p->tcfa_rate_est,
+					&p->tcfa_lock, NULL, est);
+		if (err)
+			goto err4;
+	}
+
+	p->idrinfo = idrinfo;
+	__module_get(ops->owner);
+	p->ops = ops;
+	*a = p;
+	return 0;
+err4:
+	free_percpu(p->cpu_qstats);
+err3:
+	free_percpu(p->cpu_bstats_hw);
+err2:
+	free_percpu(p->cpu_bstats);
+err1:
+	kfree(p);
+	return err;
+}
+EXPORT_SYMBOL(tcf_idr_create);
+
+int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
+			      struct nlattr *est, struct tc_action **a,
+			      const struct tc_action_ops *ops, int bind,
+			      u32 flags)
+{
+	/* Set cpustats according to actions flags. */
+	return tcf_idr_create(tn, index, est, a, ops, bind,
+			      !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
+}
+EXPORT_SYMBOL(tcf_idr_create_from_flags);
+
+/* Cleanup idr index that was allocated but not initialized. */
+
+void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
+{
+	struct tcf_idrinfo *idrinfo = tn->idrinfo;
+
+	mutex_lock(&idrinfo->lock);
+	/* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
+	WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
+	mutex_unlock(&idrinfo->lock);
+}
+EXPORT_SYMBOL(tcf_idr_cleanup);
+
+/* Check if action with specified index exists. If actions is found, increments
+ * its reference and bind counters, and return 1. Otherwise insert temporary
+ * error pointer (to prevent concurrent users from inserting actions with same
+ * index) and return 0.
+ */
+
+int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
+			struct tc_action **a, int bind)
+{
+	struct tcf_idrinfo *idrinfo = tn->idrinfo;
+	struct tc_action *p;
+	int ret;
+
+again:
+	mutex_lock(&idrinfo->lock);
+	if (*index) {
+		p = idr_find(&idrinfo->action_idr, *index);
+		if (IS_ERR(p)) {
+			/* This means that another process allocated
+			 * index but did not assign the pointer yet.
+			 */
+			mutex_unlock(&idrinfo->lock);
+			goto again;
+		}
+
+		if (p) {
+			refcount_inc(&p->tcfa_refcnt);
+			if (bind)
+				atomic_inc(&p->tcfa_bindcnt);
+			*a = p;
+			ret = 1;
+		} else {
+			*a = NULL;
+			ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
+					    *index, GFP_KERNEL);
+			if (!ret)
+				idr_replace(&idrinfo->action_idr,
+					    ERR_PTR(-EBUSY), *index);
+		}
+	} else {
+		*index = 1;
+		*a = NULL;
+		ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
+				    UINT_MAX, GFP_KERNEL);
+		if (!ret)
+			idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
+				    *index);
+	}
+	mutex_unlock(&idrinfo->lock);
+	return ret;
+}
+EXPORT_SYMBOL(tcf_idr_check_alloc);
+
+void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
+			 struct tcf_idrinfo *idrinfo)
+{
+	struct idr *idr = &idrinfo->action_idr;
+	struct tc_action *p;
+	int ret;
+	unsigned long id = 1;
+	unsigned long tmp;
+
+	idr_for_each_entry_ul(idr, p, tmp, id) {
+		ret = __tcf_idr_release(p, false, true);
+		if (ret == ACT_P_DELETED)
+			module_put(ops->owner);
+		else if (ret < 0)
+			return;
+	}
+	idr_destroy(&idrinfo->action_idr);
+}
+EXPORT_SYMBOL(tcf_idrinfo_destroy);
+
+static LIST_HEAD(act_base);
+static DEFINE_RWLOCK(act_mod_lock);
+
+int tcf_register_action(struct tc_action_ops *act,
+			struct pernet_operations *ops)
+{
+	struct tc_action_ops *a;
+	int ret;
+
+	if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
+		return -EINVAL;
+
+	/* We have to register pernet ops before making the action ops visible,
+	 * otherwise tcf_action_init_1() could get a partially initialized
+	 * netns.
+	 */
+	ret = register_pernet_subsys(ops);
+	if (ret)
+		return ret;
+
+	write_lock(&act_mod_lock);
+	list_for_each_entry(a, &act_base, head) {
+		if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
+			write_unlock(&act_mod_lock);
+			unregister_pernet_subsys(ops);
+			return -EEXIST;
+		}
+	}
+	list_add_tail(&act->head, &act_base);
+	write_unlock(&act_mod_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(tcf_register_action);
+
+int tcf_unregister_action(struct tc_action_ops *act,
+			  struct pernet_operations *ops)
+{
+	struct tc_action_ops *a;
+	int err = -ENOENT;
+
+	write_lock(&act_mod_lock);
+	list_for_each_entry(a, &act_base, head) {
+		if (a == act) {
+			list_del(&act->head);
+			err = 0;
+			break;
+		}
+	}
+	write_unlock(&act_mod_lock);
+	if (!err)
+		unregister_pernet_subsys(ops);
+	return err;
+}
+EXPORT_SYMBOL(tcf_unregister_action);
+
+/* lookup by name */
+static struct tc_action_ops *tc_lookup_action_n(char *kind)
+{
+	struct tc_action_ops *a, *res = NULL;
+
+	if (kind) {
+		read_lock(&act_mod_lock);
+		list_for_each_entry(a, &act_base, head) {
+			if (strcmp(kind, a->kind) == 0) {
+				if (try_module_get(a->owner))
+					res = a;
+				break;
+			}
+		}
+		read_unlock(&act_mod_lock);
+	}
+	return res;
+}
+
+/* lookup by nlattr */
+static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
+{
+	struct tc_action_ops *a, *res = NULL;
+
+	if (kind) {
+		read_lock(&act_mod_lock);
+		list_for_each_entry(a, &act_base, head) {
+			if (nla_strcmp(kind, a->kind) == 0) {
+				if (try_module_get(a->owner))
+					res = a;
+				break;
+			}
+		}
+		read_unlock(&act_mod_lock);
+	}
+	return res;
+}
+
+/*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
+#define TCA_ACT_MAX_PRIO_MASK 0x1FF
+int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
+		    int nr_actions, struct tcf_result *res)
+{
+	u32 jmp_prgcnt = 0;
+	u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
+	int i;
+	int ret = TC_ACT_OK;
+
+	if (skb_skip_tc_classify(skb))
+		return TC_ACT_OK;
+
+restart_act_graph:
+	for (i = 0; i < nr_actions; i++) {
+		const struct tc_action *a = actions[i];
+		int repeat_ttl;
+
+		if (jmp_prgcnt > 0) {
+			jmp_prgcnt -= 1;
+			continue;
+		}
+
+		repeat_ttl = 32;
+repeat:
+		ret = a->ops->act(skb, a, res);
+
+		if (unlikely(ret == TC_ACT_REPEAT)) {
+			if (--repeat_ttl != 0)
+				goto repeat;
+			/* suspicious opcode, stop pipeline */
+			net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
+			return TC_ACT_OK;
+		}
+
+		if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
+			jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
+			if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
+				/* faulty opcode, stop pipeline */
+				return TC_ACT_OK;
+			} else {
+				jmp_ttl -= 1;
+				if (jmp_ttl > 0)
+					goto restart_act_graph;
+				else /* faulty graph, stop pipeline */
+					return TC_ACT_OK;
+			}
+		} else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
+			if (unlikely(!rcu_access_pointer(a->goto_chain))) {
+				net_warn_ratelimited("can't go to NULL chain!\n");
+				return TC_ACT_SHOT;
+			}
+			tcf_action_goto_chain_exec(a, res);
+		}
+
+		if (ret != TC_ACT_PIPE)
+			break;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL(tcf_action_exec);
+
+int tcf_action_destroy(struct tc_action *actions[], int bind)
+{
+	const struct tc_action_ops *ops;
+	struct tc_action *a;
+	int ret = 0, i;
+
+	for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
+		a = actions[i];
+		actions[i] = NULL;
+		ops = a->ops;
+		ret = __tcf_idr_release(a, bind, true);
+		if (ret == ACT_P_DELETED)
+			module_put(ops->owner);
+		else if (ret < 0)
+			return ret;
+	}
+	return ret;
+}
+
+static int tcf_action_put(struct tc_action *p)
+{
+	return __tcf_action_put(p, false);
+}
+
+/* Put all actions in this array, skip those NULL's. */
+static void tcf_action_put_many(struct tc_action *actions[])
+{
+	int i;
+
+	for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
+		struct tc_action *a = actions[i];
+		const struct tc_action_ops *ops;
+
+		if (!a)
+			continue;
+		ops = a->ops;
+		if (tcf_action_put(a))
+			module_put(ops->owner);
+	}
+}
+
+int
+tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
+{
+	return a->ops->dump(skb, a, bind, ref);
+}
+
+static int
+tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a)
+{
+	unsigned char *b = skb_tail_pointer(skb);
+	struct tc_cookie *cookie;
+
+	if (nla_put_string(skb, TCA_KIND, a->ops->kind))
+		goto nla_put_failure;
+	if (tcf_action_copy_stats(skb, a, 0))
+		goto nla_put_failure;
+
+	rcu_read_lock();
+	cookie = rcu_dereference(a->act_cookie);
+	if (cookie) {
+		if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
+			rcu_read_unlock();
+			goto nla_put_failure;
+		}
+	}
+	rcu_read_unlock();
+
+	return 0;
+
+nla_put_failure:
+	nlmsg_trim(skb, b);
+	return -1;
+}
+
+int
+tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
+{
+	int err = -EINVAL;
+	unsigned char *b = skb_tail_pointer(skb);
+	struct nlattr *nest;
+
+	if (tcf_action_dump_terse(skb, a))
+		goto nla_put_failure;
+
+	if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
+	    nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
+			       a->hw_stats, TCA_ACT_HW_STATS_ANY))
+		goto nla_put_failure;
+
+	if (a->used_hw_stats_valid &&
+	    nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
+			       a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
+		goto nla_put_failure;
+
+	if (a->tcfa_flags &&
+	    nla_put_bitfield32(skb, TCA_ACT_FLAGS,
+			       a->tcfa_flags, a->tcfa_flags))
+		goto nla_put_failure;
+
+	nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
+	if (nest == NULL)
+		goto nla_put_failure;
+	err = tcf_action_dump_old(skb, a, bind, ref);
+	if (err > 0) {
+		nla_nest_end(skb, nest);
+		return err;
+	}
+
+nla_put_failure:
+	nlmsg_trim(skb, b);
+	return -1;
+}
+EXPORT_SYMBOL(tcf_action_dump_1);
+
+int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
+		    int bind, int ref, bool terse)
+{
+	struct tc_action *a;
+	int err = -EINVAL, i;
+	struct nlattr *nest;
+
+	for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
+		a = actions[i];
+		nest = nla_nest_start_noflag(skb, i + 1);
+		if (nest == NULL)
+			goto nla_put_failure;
+		err = terse ? tcf_action_dump_terse(skb, a) :
+			tcf_action_dump_1(skb, a, bind, ref);
+		if (err < 0)
+			goto errout;
+		nla_nest_end(skb, nest);
+	}
+
+	return 0;
+
+nla_put_failure:
+	err = -EINVAL;
+errout:
+	nla_nest_cancel(skb, nest);
+	return err;
+}
+
+static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
+{
+	struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
+	if (!c)
+		return NULL;
+
+	c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
+	if (!c->data) {
+		kfree(c);
+		return NULL;
+	}
+	c->len = nla_len(tb[TCA_ACT_COOKIE]);
+
+	return c;
+}
+
+static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
+{
+	struct nla_bitfield32 hw_stats_bf;
+
+	/* If the user did not pass the attr, that means he does
+	 * not care about the type. Return "any" in that case
+	 * which is setting on all supported types.
+	 */
+	if (!hw_stats_attr)
+		return TCA_ACT_HW_STATS_ANY;
+	hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
+	return hw_stats_bf.value;
+}
+
+static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
+	[TCA_ACT_KIND]		= { .type = NLA_STRING },
+	[TCA_ACT_INDEX]		= { .type = NLA_U32 },
+	[TCA_ACT_COOKIE]	= { .type = NLA_BINARY,
+				    .len = TC_COOKIE_MAX_SIZE },
+	[TCA_ACT_OPTIONS]	= { .type = NLA_NESTED },
+	[TCA_ACT_FLAGS]		= NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS),
+	[TCA_ACT_HW_STATS]	= NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
+};
+
+void tcf_idr_insert_many(struct tc_action *actions[])
+{
+	int i;
+
+	for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
+		struct tc_action *a = actions[i];
+		struct tcf_idrinfo *idrinfo;
+
+		if (!a)
+			continue;
+		idrinfo = a->idrinfo;
+		mutex_lock(&idrinfo->lock);
+		/* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if
+		 * it is just created, otherwise this is just a nop.
+		 */
+		idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
+		mutex_unlock(&idrinfo->lock);
+	}
+}
+
+struct tc_action_ops *tc_action_load_ops(char *name, struct nlattr *nla,
+					 bool rtnl_held,
+					 struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[TCA_ACT_MAX + 1];
+	struct tc_action_ops *a_o;
+	char act_name[IFNAMSIZ];
+	struct nlattr *kind;
+	int err;
+
+	if (name == NULL) {
+		err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
+						  tcf_action_policy, extack);
+		if (err < 0)
+			return ERR_PTR(err);
+		err = -EINVAL;
+		kind = tb[TCA_ACT_KIND];
+		if (!kind) {
+			NL_SET_ERR_MSG(extack, "TC action kind must be specified");
+			return ERR_PTR(err);
+		}
+		if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
+			NL_SET_ERR_MSG(extack, "TC action name too long");
+			return ERR_PTR(err);
+		}
+	} else {
+		if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
+			NL_SET_ERR_MSG(extack, "TC action name too long");
+			return ERR_PTR(-EINVAL);
+		}
+	}
+
+	a_o = tc_lookup_action_n(act_name);
+	if (a_o == NULL) {
+#ifdef CONFIG_MODULES
+		if (rtnl_held)
+			rtnl_unlock();
+		request_module("act_%s", act_name);
+		if (rtnl_held)
+			rtnl_lock();
+
+		a_o = tc_lookup_action_n(act_name);
+
+		/* We dropped the RTNL semaphore in order to
+		 * perform the module load.  So, even if we
+		 * succeeded in loading the module we have to
+		 * tell the caller to replay the request.  We
+		 * indicate this using -EAGAIN.
+		 */
+		if (a_o != NULL) {
+			module_put(a_o->owner);
+			return ERR_PTR(-EAGAIN);
+		}
+#endif
+		NL_SET_ERR_MSG(extack, "Failed to load TC action module");
+		return ERR_PTR(-ENOENT);
+	}
+
+	return a_o;
+}
+
+struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
+				    struct nlattr *nla, struct nlattr *est,
+				    char *name, int ovr, int bind,
+				    struct tc_action_ops *a_o, int *init_res,
+				    bool rtnl_held,
+				    struct netlink_ext_ack *extack)
+{
+	struct nla_bitfield32 flags = { 0, 0 };
+	u8 hw_stats = TCA_ACT_HW_STATS_ANY;
+	struct nlattr *tb[TCA_ACT_MAX + 1];
+	struct tc_cookie *cookie = NULL;
+	struct tc_action *a;
+	int err;
+
+	/* backward compatibility for policer */
+	if (name == NULL) {
+		err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
+						  tcf_action_policy, extack);
+		if (err < 0)
+			return ERR_PTR(err);
+		if (tb[TCA_ACT_COOKIE]) {
+			cookie = nla_memdup_cookie(tb);
+			if (!cookie) {
+				NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
+				err = -ENOMEM;
+				goto err_out;
+			}
+		}
+		hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
+		if (tb[TCA_ACT_FLAGS])
+			flags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
+
+		err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind,
+				rtnl_held, tp, flags.value, extack);
+	} else {
+		err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held,
+				tp, flags.value, extack);
+	}
+	if (err < 0)
+		goto err_out;
+	*init_res = err;
+
+	if (!name && tb[TCA_ACT_COOKIE])
+		tcf_set_action_cookie(&a->act_cookie, cookie);
+
+	if (!name)
+		a->hw_stats = hw_stats;
+
+	return a;
+
+err_out:
+	if (cookie) {
+		kfree(cookie->data);
+		kfree(cookie);
+	}
+	return ERR_PTR(err);
+}
+
+/* Returns numbers of initialized actions or negative error. */
+
+int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
+		    struct nlattr *est, char *name, int ovr, int bind,
+		    struct tc_action *actions[], int init_res[], size_t *attr_size,
+		    bool rtnl_held, struct netlink_ext_ack *extack)
+{
+	struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
+	struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
+	struct tc_action *act;
+	size_t sz = 0;
+	int err;
+	int i;
+
+	err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
+					  extack);
+	if (err < 0)
+		return err;
+
+	for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
+		struct tc_action_ops *a_o;
+
+		a_o = tc_action_load_ops(name, tb[i], rtnl_held, extack);
+		if (IS_ERR(a_o)) {
+			err = PTR_ERR(a_o);
+			goto err_mod;
+		}
+		ops[i - 1] = a_o;
+	}
+
+	for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
+		act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
+					ops[i - 1], &init_res[i - 1], rtnl_held,
+					extack);
+		if (IS_ERR(act)) {
+			err = PTR_ERR(act);
+			goto err;
+		}
+		sz += tcf_action_fill_size(act);
+		/* Start from index 0 */
+		actions[i - 1] = act;
+	}
+
+	/* We have to commit them all together, because if any error happened in
+	 * between, we could not handle the failure gracefully.
+	 */
+	tcf_idr_insert_many(actions);
+
+	*attr_size = tcf_action_full_attrs_size(sz);
+	err = i - 1;
+	goto err_mod;
+
+err:
+	tcf_action_destroy(actions, bind);
+err_mod:
+	for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
+		if (ops[i])
+			module_put(ops[i]->owner);
+	}
+	return err;
+}
+
+void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
+			     u64 drops, bool hw)
+{
+	if (a->cpu_bstats) {
+		_bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
+
+		this_cpu_ptr(a->cpu_qstats)->drops += drops;
+
+		if (hw)
+			_bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
+					   bytes, packets);
+		return;
+	}
+
+	_bstats_update(&a->tcfa_bstats, bytes, packets);
+	a->tcfa_qstats.drops += drops;
+	if (hw)
+		_bstats_update(&a->tcfa_bstats_hw, bytes, packets);
+}
+EXPORT_SYMBOL(tcf_action_update_stats);
+
+int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
+			  int compat_mode)
+{
+	int err = 0;
+	struct gnet_dump d;
+
+	if (p == NULL)
+		goto errout;
+
+	/* compat_mode being true specifies a call that is supposed
+	 * to add additional backward compatibility statistic TLVs.
+	 */
+	if (compat_mode) {
+		if (p->type == TCA_OLD_COMPAT)
+			err = gnet_stats_start_copy_compat(skb, 0,
+							   TCA_STATS,
+							   TCA_XSTATS,
+							   &p->tcfa_lock, &d,
+							   TCA_PAD);
+		else
+			return 0;
+	} else
+		err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
+					    &p->tcfa_lock, &d, TCA_ACT_PAD);
+
+	if (err < 0)
+		goto errout;
+
+	if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
+	    gnet_stats_copy_basic_hw(NULL, &d, p->cpu_bstats_hw,
+				     &p->tcfa_bstats_hw) < 0 ||
+	    gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
+	    gnet_stats_copy_queue(&d, p->cpu_qstats,
+				  &p->tcfa_qstats,
+				  p->tcfa_qstats.qlen) < 0)
+		goto errout;
+
+	if (gnet_stats_finish_copy(&d) < 0)
+		goto errout;
+
+	return 0;
+
+errout:
+	return -1;
+}
+
+static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
+			u32 portid, u32 seq, u16 flags, int event, int bind,
+			int ref)
+{
+	struct tcamsg *t;
+	struct nlmsghdr *nlh;
+	unsigned char *b = skb_tail_pointer(skb);
+	struct nlattr *nest;
+
+	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
+	if (!nlh)
+		goto out_nlmsg_trim;
+	t = nlmsg_data(nlh);
+	t->tca_family = AF_UNSPEC;
+	t->tca__pad1 = 0;
+	t->tca__pad2 = 0;
+
+	nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
+	if (!nest)
+		goto out_nlmsg_trim;
+
+	if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
+		goto out_nlmsg_trim;
+
+	nla_nest_end(skb, nest);
+
+	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
+	return skb->len;
+
+out_nlmsg_trim:
+	nlmsg_trim(skb, b);
+	return -1;
+}
+
+static int
+tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
+	       struct tc_action *actions[], int event,
+	       struct netlink_ext_ack *extack)
+{
+	struct sk_buff *skb;
+
+	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!skb)
+		return -ENOBUFS;
+	if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
+			 0, 1) <= 0) {
+		NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
+		kfree_skb(skb);
+		return -EINVAL;
+	}
+
+	return rtnl_unicast(skb, net, portid);
+}
+
+static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
+					  struct nlmsghdr *n, u32 portid,
+					  struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[TCA_ACT_MAX + 1];
+	const struct tc_action_ops *ops;
+	struct tc_action *a;
+	int index;
+	int err;
+
+	err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
+					  tcf_action_policy, extack);
+	if (err < 0)
+		goto err_out;
+
+	err = -EINVAL;
+	if (tb[TCA_ACT_INDEX] == NULL ||
+	    nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
+		NL_SET_ERR_MSG(extack, "Invalid TC action index value");
+		goto err_out;
+	}
+	index = nla_get_u32(tb[TCA_ACT_INDEX]);
+
+	err = -EINVAL;
+	ops = tc_lookup_action(tb[TCA_ACT_KIND]);
+	if (!ops) { /* could happen in batch of actions */
+		NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
+		goto err_out;
+	}
+	err = -ENOENT;
+	if (ops->lookup(net, &a, index) == 0) {
+		NL_SET_ERR_MSG(extack, "TC action with specified index not found");
+		goto err_mod;
+	}
+
+	module_put(ops->owner);
+	return a;
+
+err_mod:
+	module_put(ops->owner);
+err_out:
+	return ERR_PTR(err);
+}
+
+static int tca_action_flush(struct net *net, struct nlattr *nla,
+			    struct nlmsghdr *n, u32 portid,
+			    struct netlink_ext_ack *extack)
+{
+	struct sk_buff *skb;
+	unsigned char *b;
+	struct nlmsghdr *nlh;
+	struct tcamsg *t;
+	struct netlink_callback dcb;
+	struct nlattr *nest;
+	struct nlattr *tb[TCA_ACT_MAX + 1];
+	const struct tc_action_ops *ops;
+	struct nlattr *kind;
+	int err = -ENOMEM;
+
+	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!skb)
+		return err;
+
+	b = skb_tail_pointer(skb);
+
+	err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
+					  tcf_action_policy, extack);
+	if (err < 0)
+		goto err_out;
+
+	err = -EINVAL;
+	kind = tb[TCA_ACT_KIND];
+	ops = tc_lookup_action(kind);
+	if (!ops) { /*some idjot trying to flush unknown action */
+		NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
+		goto err_out;
+	}
+
+	nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
+			sizeof(*t), 0);
+	if (!nlh) {
+		NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
+		goto out_module_put;
+	}
+	t = nlmsg_data(nlh);
+	t->tca_family = AF_UNSPEC;
+	t->tca__pad1 = 0;
+	t->tca__pad2 = 0;
+
+	nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
+	if (!nest) {
+		NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
+		goto out_module_put;
+	}
+
+	err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
+	if (err <= 0) {
+		nla_nest_cancel(skb, nest);
+		goto out_module_put;
+	}
+
+	nla_nest_end(skb, nest);
+
+	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
+	nlh->nlmsg_flags |= NLM_F_ROOT;
+	module_put(ops->owner);
+	err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
+			     n->nlmsg_flags & NLM_F_ECHO);
+	if (err > 0)
+		return 0;
+	if (err < 0)
+		NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
+
+	return err;
+
+out_module_put:
+	module_put(ops->owner);
+err_out:
+	kfree_skb(skb);
+	return err;
+}
+
+static int tcf_action_delete(struct net *net, struct tc_action *actions[])
+{
+	int i;
+
+	for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
+		struct tc_action *a = actions[i];
+		const struct tc_action_ops *ops = a->ops;
+		/* Actions can be deleted concurrently so we must save their
+		 * type and id to search again after reference is released.
+		 */
+		struct tcf_idrinfo *idrinfo = a->idrinfo;
+		u32 act_index = a->tcfa_index;
+
+		actions[i] = NULL;
+		if (tcf_action_put(a)) {
+			/* last reference, action was deleted concurrently */
+			module_put(ops->owner);
+		} else  {
+			int ret;
+
+			/* now do the delete */
+			ret = tcf_idr_delete_index(idrinfo, act_index);
+			if (ret < 0)
+				return ret;
+		}
+	}
+	return 0;
+}
+
+static int
+tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
+	       u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
+{
+	int ret;
+	struct sk_buff *skb;
+
+	skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
+			GFP_KERNEL);
+	if (!skb)
+		return -ENOBUFS;
+
+	if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
+			 0, 2) <= 0) {
+		NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
+		kfree_skb(skb);
+		return -EINVAL;
+	}
+
+	/* now do the delete */
+	ret = tcf_action_delete(net, actions);
+	if (ret < 0) {
+		NL_SET_ERR_MSG(extack, "Failed to delete TC action");
+		kfree_skb(skb);
+		return ret;
+	}
+
+	ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
+			     n->nlmsg_flags & NLM_F_ECHO);
+	if (ret > 0)
+		return 0;
+	return ret;
+}
+
+static int
+tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
+	      u32 portid, int event, struct netlink_ext_ack *extack)
+{
+	int i, ret;
+	struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
+	struct tc_action *act;
+	size_t attr_size = 0;
+	struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
+
+	ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
+					  extack);
+	if (ret < 0)
+		return ret;
+
+	if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
+		if (tb[1])
+			return tca_action_flush(net, tb[1], n, portid, extack);
+
+		NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
+		return -EINVAL;
+	}
+
+	for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
+		act = tcf_action_get_1(net, tb[i], n, portid, extack);
+		if (IS_ERR(act)) {
+			ret = PTR_ERR(act);
+			goto err;
+		}
+		attr_size += tcf_action_fill_size(act);
+		actions[i - 1] = act;
+	}
+
+	attr_size = tcf_action_full_attrs_size(attr_size);
+
+	if (event == RTM_GETACTION)
+		ret = tcf_get_notify(net, portid, n, actions, event, extack);
+	else { /* delete */
+		ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
+		if (ret)
+			goto err;
+		return 0;
+	}
+err:
+	tcf_action_put_many(actions);
+	return ret;
+}
+
+static int
+tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
+	       u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
+{
+	struct sk_buff *skb;
+	int err = 0;
+
+	skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
+			GFP_KERNEL);
+	if (!skb)
+		return -ENOBUFS;
+
+	if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
+			 RTM_NEWACTION, 0, 0) <= 0) {
+		NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
+		kfree_skb(skb);
+		return -EINVAL;
+	}
+
+	err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
+			     n->nlmsg_flags & NLM_F_ECHO);
+	if (err > 0)
+		err = 0;
+	return err;
+}
+
+static int tcf_action_add(struct net *net, struct nlattr *nla,
+			  struct nlmsghdr *n, u32 portid, int ovr,
+			  struct netlink_ext_ack *extack)
+{
+	size_t attr_size = 0;
+	int loop, ret, i;
+	struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
+	int init_res[TCA_ACT_MAX_PRIO] = {};
+
+	for (loop = 0; loop < 10; loop++) {
+		ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0,
+				      actions, init_res, &attr_size, true, extack);
+		if (ret != -EAGAIN)
+			break;
+	}
+
+	if (ret < 0)
+		return ret;
+	ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
+
+	/* only put existing actions */
+	for (i = 0; i < TCA_ACT_MAX_PRIO; i++)
+		if (init_res[i] == ACT_P_CREATED)
+			actions[i] = NULL;
+	tcf_action_put_many(actions);
+
+	return ret;
+}
+
+static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
+	[TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_FLAG_LARGE_DUMP_ON),
+	[TCA_ROOT_TIME_DELTA]      = { .type = NLA_U32 },
+};
+
+static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
+			 struct netlink_ext_ack *extack)
+{
+	struct net *net = sock_net(skb->sk);
+	struct nlattr *tca[TCA_ROOT_MAX + 1];
+	u32 portid = NETLINK_CB(skb).portid;
+	int ret = 0, ovr = 0;
+
+	if ((n->nlmsg_type != RTM_GETACTION) &&
+	    !netlink_capable(skb, CAP_NET_ADMIN))
+		return -EPERM;
+
+	ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
+				     TCA_ROOT_MAX, NULL, extack);
+	if (ret < 0)
+		return ret;
+
+	if (tca[TCA_ACT_TAB] == NULL) {
+		NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
+		return -EINVAL;
+	}
+
+	/* n->nlmsg_flags & NLM_F_CREATE */
+	switch (n->nlmsg_type) {
+	case RTM_NEWACTION:
+		/* we are going to assume all other flags
+		 * imply create only if it doesn't exist
+		 * Note that CREATE | EXCL implies that
+		 * but since we want avoid ambiguity (eg when flags
+		 * is zero) then just set this
+		 */
+		if (n->nlmsg_flags & NLM_F_REPLACE)
+			ovr = 1;
+		ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr,
+				     extack);
+		break;
+	case RTM_DELACTION:
+		ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
+				    portid, RTM_DELACTION, extack);
+		break;
+	case RTM_GETACTION:
+		ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
+				    portid, RTM_GETACTION, extack);
+		break;
+	default:
+		BUG();
+	}
+
+	return ret;
+}
+
+static struct nlattr *find_dump_kind(struct nlattr **nla)
+{
+	struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
+	struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
+	struct nlattr *kind;
+
+	tb1 = nla[TCA_ACT_TAB];
+	if (tb1 == NULL)
+		return NULL;
+
+	if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
+		return NULL;
+
+	if (tb[1] == NULL)
+		return NULL;
+	if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
+		return NULL;
+	kind = tb2[TCA_ACT_KIND];
+
+	return kind;
+}
+
+static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct net *net = sock_net(skb->sk);
+	struct nlmsghdr *nlh;
+	unsigned char *b = skb_tail_pointer(skb);
+	struct nlattr *nest;
+	struct tc_action_ops *a_o;
+	int ret = 0;
+	struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
+	struct nlattr *tb[TCA_ROOT_MAX + 1];
+	struct nlattr *count_attr = NULL;
+	unsigned long jiffy_since = 0;
+	struct nlattr *kind = NULL;
+	struct nla_bitfield32 bf;
+	u32 msecs_since = 0;
+	u32 act_count = 0;
+
+	ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
+				     TCA_ROOT_MAX, tcaa_policy, cb->extack);
+	if (ret < 0)
+		return ret;
+
+	kind = find_dump_kind(tb);
+	if (kind == NULL) {
+		pr_info("tc_dump_action: action bad kind\n");
+		return 0;
+	}
+
+	a_o = tc_lookup_action(kind);
+	if (a_o == NULL)
+		return 0;
+
+	cb->args[2] = 0;
+	if (tb[TCA_ROOT_FLAGS]) {
+		bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
+		cb->args[2] = bf.value;
+	}
+
+	if (tb[TCA_ROOT_TIME_DELTA]) {
+		msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
+	}
+
+	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+			cb->nlh->nlmsg_type, sizeof(*t), 0);
+	if (!nlh)
+		goto out_module_put;
+
+	if (msecs_since)
+		jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
+
+	t = nlmsg_data(nlh);
+	t->tca_family = AF_UNSPEC;
+	t->tca__pad1 = 0;
+	t->tca__pad2 = 0;
+	cb->args[3] = jiffy_since;
+	count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
+	if (!count_attr)
+		goto out_module_put;
+
+	nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
+	if (nest == NULL)
+		goto out_module_put;
+
+	ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
+	if (ret < 0)
+		goto out_module_put;
+
+	if (ret > 0) {
+		nla_nest_end(skb, nest);
+		ret = skb->len;
+		act_count = cb->args[1];
+		memcpy(nla_data(count_attr), &act_count, sizeof(u32));
+		cb->args[1] = 0;
+	} else
+		nlmsg_trim(skb, b);
+
+	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
+	if (NETLINK_CB(cb->skb).portid && ret)
+		nlh->nlmsg_flags |= NLM_F_MULTI;
+	module_put(a_o->owner);
+	return skb->len;
+
+out_module_put:
+	module_put(a_o->owner);
+	nlmsg_trim(skb, b);
+	return skb->len;
+}
+
+static int __init tc_action_init(void)
+{
+	rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
+	rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
+	rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
+		      0);
+
+	return 0;
+}
+
+subsys_initcall(tc_action_init);