// 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/tc_act/tc_pedit.h>
#include <net/act_api.h>
#include <net/netlink.h>
#include <net/flow_offload.h>
#include <net/tc_wrapper.h>

#ifdef CONFIG_INET
DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
EXPORT_SYMBOL_GPL(tcf_frag_xmit_count);
#endif

int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb))
{
#ifdef CONFIG_INET
        if (static_branch_unlikely(&tcf_frag_xmit_count))
                return sch_frag_xmit_hook(skb, xmit);
#endif

        return xmit(skb);
}
EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit);

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 = unrcu_pointer(xchg(old_cookie, RCU_INITIALIZER(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->user_cookie, NULL);
        if (chain)
                tcf_chain_put_by_act(chain);

        kfree(p);
}

static void offload_action_hw_count_set(struct tc_action *act,
                                        u32 hw_count)
{
        act->in_hw_count = hw_count;
}

static void offload_action_hw_count_inc(struct tc_action *act,
                                        u32 hw_count)
{
        act->in_hw_count += hw_count;
}

static void offload_action_hw_count_dec(struct tc_action *act,
                                        u32 hw_count)
{
        act->in_hw_count = act->in_hw_count > hw_count ?
                           act->in_hw_count - hw_count : 0;
}

static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act)
{
        if (is_tcf_pedit(act))
                return tcf_pedit_nkeys(act);
        else
                return 1;
}

static bool tc_act_skip_hw(u32 flags)
{
        return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false;
}

static bool tc_act_skip_sw(u32 flags)
{
        return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false;
}

/* SKIP_HW and SKIP_SW are mutually exclusive flags. */
static bool tc_act_flags_valid(u32 flags)
{
        flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW;

        return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW);
}

static int offload_action_init(struct flow_offload_action *fl_action,
                               struct tc_action *act,
                               enum offload_act_command  cmd,
                               struct netlink_ext_ack *extack)
{
        int err;

        fl_action->extack = extack;
        fl_action->command = cmd;
        fl_action->index = act->tcfa_index;
        fl_action->cookie = (unsigned long)act;

        if (act->ops->offload_act_setup) {
                spin_lock_bh(&act->tcfa_lock);
                err = act->ops->offload_act_setup(act, fl_action, NULL,
                                                  false, extack);
                spin_unlock_bh(&act->tcfa_lock);
                return err;
        }

        return -EOPNOTSUPP;
}

static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act,
                                     u32 *hw_count)
{
        int err;

        err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT,
                                          fl_act, NULL, NULL);
        if (err < 0)
                return err;

        if (hw_count)
                *hw_count = err;

        return 0;
}

static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act,
                                        u32 *hw_count,
                                        flow_indr_block_bind_cb_t *cb,
                                        void *cb_priv)
{
        int err;

        err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL);
        if (err < 0)
                return err;

        if (hw_count)
                *hw_count = 1;

        return 0;
}

static int tcf_action_offload_cmd(struct flow_offload_action *fl_act,
                                  u32 *hw_count,
                                  flow_indr_block_bind_cb_t *cb,
                                  void *cb_priv)
{
        return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count,
                                                 cb, cb_priv) :
                    tcf_action_offload_cmd_ex(fl_act, hw_count);
}

static int tcf_action_offload_add_ex(struct tc_action *action,
                                     struct netlink_ext_ack *extack,
                                     flow_indr_block_bind_cb_t *cb,
                                     void *cb_priv)
{
        bool skip_sw = tc_act_skip_sw(action->tcfa_flags);
        struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
                [0] = action,
        };
        struct flow_offload_action *fl_action;
        u32 in_hw_count = 0;
        int num, err = 0;

        if (tc_act_skip_hw(action->tcfa_flags))
                return 0;

        num = tcf_offload_act_num_actions_single(action);
        fl_action = offload_action_alloc(num);
        if (!fl_action)
                return -ENOMEM;

        err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack);
        if (err)
                goto fl_err;

        err = tc_setup_action(&fl_action->action, actions, 0, extack);
        if (err) {
                NL_SET_ERR_MSG_MOD(extack,
                                   "Failed to setup tc actions for offload");
                goto fl_err;
        }

        err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv);
        if (!err)
                cb ? offload_action_hw_count_inc(action, in_hw_count) :
                     offload_action_hw_count_set(action, in_hw_count);

        if (skip_sw && !tc_act_in_hw(action))
                err = -EINVAL;

        tc_cleanup_offload_action(&fl_action->action);

fl_err:
        kfree(fl_action);

        return err;
}

/* offload the tc action after it is inserted */
static int tcf_action_offload_add(struct tc_action *action,
                                  struct netlink_ext_ack *extack)
{
        return tcf_action_offload_add_ex(action, extack, NULL, NULL);
}

int tcf_action_update_hw_stats(struct tc_action *action)
{
        struct flow_offload_action fl_act = {};
        int err;

        err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL);
        if (err)
                return err;

        err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL);
        if (!err) {
                preempt_disable();
                tcf_action_stats_update(action, fl_act.stats.bytes,
                                        fl_act.stats.pkts,
                                        fl_act.stats.drops,
                                        fl_act.stats.lastused,
                                        true);
                preempt_enable();
                action->used_hw_stats = fl_act.stats.used_hw_stats;
                action->used_hw_stats_valid = true;
        } else {
                return -EOPNOTSUPP;
        }

        return 0;
}
EXPORT_SYMBOL(tcf_action_update_hw_stats);

static int tcf_action_offload_del_ex(struct tc_action *action,
                                     flow_indr_block_bind_cb_t *cb,
                                     void *cb_priv)
{
        struct flow_offload_action fl_act = {};
        u32 in_hw_count = 0;
        int err = 0;

        if (!tc_act_in_hw(action))
                return 0;

        err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL);
        if (err)
                return err;

        err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv);
        if (err < 0)
                return err;

        if (!cb && action->in_hw_count != in_hw_count)
                return -EINVAL;

        /* do not need to update hw state when deleting action */
        if (cb && in_hw_count)
                offload_action_hw_count_dec(action, in_hw_count);

        return 0;
}

static int tcf_action_offload_del(struct tc_action *action)
{
        return tcf_action_offload_del_ex(action, NULL, NULL);
}

static void tcf_action_cleanup(struct tc_action *p)
{
        tcf_action_offload_del(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 *user_cookie;
        u32 cookie_len = 0;

        rcu_read_lock();
        user_cookie = rcu_dereference(act->user_cookie);

        if (user_cookie)
                cookie_len = nla_total_size(user_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_ACT_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_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
{
        unsigned char *b = skb_tail_pointer(skb);
        struct tc_cookie *cookie;

        if (nla_put_string(skb, TCA_ACT_KIND, a->ops->kind))
                goto nla_put_failure;
        if (tcf_action_copy_stats(skb, a, 0))
                goto nla_put_failure;
        if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index))
                goto nla_put_failure;

        rcu_read_lock();
        cookie = rcu_dereference(a->user_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;
}

static int
tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
{
        unsigned char *b = skb_tail_pointer(skb);
        struct nlattr *nest;
        int err = -EINVAL;
        u32 flags;

        if (tcf_action_dump_terse(skb, a, false))
                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;

        flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK;
        if (flags &&
            nla_put_bitfield32(skb, TCA_ACT_FLAGS,
                               flags, flags))
                goto nla_put_failure;

        if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count))
                goto nla_put_failure;

        nest = nla_nest_start_noflag(skb, TCA_ACT_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;
}

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;

                tcf_action_update_hw_stats(p);

                nest = nla_nest_start_noflag(skb, n_i);
                if (!nest) {
                        index--;
                        goto nla_put_failure;
                }
                err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
                        tcf_action_dump_terse(skb, p, true) :
                        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_ACT_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_ACT_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_ACT_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_generic_walker(struct net *net, struct sk_buff *skb,
                                struct netlink_callback *cb, int type,
                                const struct tc_action_ops *ops,
                                struct netlink_ext_ack *extack)
{
        struct tc_action_net *tn = net_generic(net, ops->net_id);

        if (unlikely(ops->walk))
                return ops->walk(net, skb, cb, type, ops, extack);

        return tcf_generic_walker(tn, skb, cb, type, ops, extack);
}

static int __tcf_idr_search(struct net *net,
                            const struct tc_action_ops *ops,
                            struct tc_action **a, u32 index)
{
        struct tc_action_net *tn = net_generic(net, ops->net_id);

        if (unlikely(ops->lookup))
                return ops->lookup(net, a, index);

        return tcf_idr_search(tn, a, index);
}

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_sync);
                if (!p->cpu_bstats)
                        goto err1;
                p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
                if (!p->cpu_bstats_hw)
                        goto err2;
                p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
                if (!p->cpu_qstats)
                        goto err3;
        }
        gnet_stats_basic_sync_init(&p->tcfa_bstats);
        gnet_stats_basic_sync_init(&p->tcfa_bstats_hw);
        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, false, 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.
 *
 * May return -EAGAIN for binding actions in case of a parallel add/delete on
 * the requested index.
 */

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;
        u32 max;

        if (*index) {
                rcu_read_lock();
                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.
                         */
                        rcu_read_unlock();
                        return -EAGAIN;
                }

                if (!p) {
                        /* Empty slot, try to allocate it */
                        max = *index;
                        rcu_read_unlock();
                        goto new;
                }

                if (!refcount_inc_not_zero(&p->tcfa_refcnt)) {
                        /* Action was deleted in parallel */
                        rcu_read_unlock();
                        return -EAGAIN;
                }

                if (bind)
                        atomic_inc(&p->tcfa_bindcnt);
                *a = p;

                rcu_read_unlock();

                return 1;
        } else {
                /* Find a slot */
                *index = 1;
                max = UINT_MAX;
        }

new:
        *a = NULL;

        mutex_lock(&idrinfo->lock);
        ret = idr_alloc_u32(&idrinfo->action_idr, ERR_PTR(-EBUSY), index, max,
                            GFP_KERNEL);
        mutex_unlock(&idrinfo->lock);

        /* N binds raced for action allocation,
         * retry for all the ones that failed.
         */
        if (ret == -ENOSPC && *index == max)
                ret = -EAGAIN;

        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;
        bool mutex_taken = false;
        struct tc_action *p;
        unsigned long id = 1;
        unsigned long tmp;
        int ret;

        idr_for_each_entry_ul(idr, p, tmp, id) {
                if (IS_ERR(p))
                        continue;
                if (tc_act_in_hw(p) && !mutex_taken) {
                        rtnl_lock();
                        mutex_taken = true;
                }
                ret = __tcf_idr_release(p, false, true);
                if (ret == ACT_P_DELETED)
                        module_put(ops->owner);
                else if (ret < 0)
                        return;
        }
        if (mutex_taken)
                rtnl_unlock();
        idr_destroy(&idrinfo->action_idr);
}
EXPORT_SYMBOL(tcf_idrinfo_destroy);

static LIST_HEAD(act_base);
static DEFINE_RWLOCK(act_mod_lock);
/* since act ops id is stored in pernet subsystem list,
 * then there is no way to walk through only all the action
 * subsystem, so we keep tc action pernet ops id for
 * reoffload to walk through.
 */
static LIST_HEAD(act_pernet_id_list);
static DEFINE_MUTEX(act_id_mutex);
struct tc_act_pernet_id {
        struct list_head list;
        unsigned int id;
};

static int tcf_pernet_add_id_list(unsigned int id)
{
        struct tc_act_pernet_id *id_ptr;
        int ret = 0;

        mutex_lock(&act_id_mutex);
        list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
                if (id_ptr->id == id) {
                        ret = -EEXIST;
                        goto err_out;
                }
        }

        id_ptr = kzalloc_obj(*id_ptr);
        if (!id_ptr) {
                ret = -ENOMEM;
                goto err_out;
        }
        id_ptr->id = id;

        list_add_tail(&id_ptr->list, &act_pernet_id_list);

err_out:
        mutex_unlock(&act_id_mutex);
        return ret;
}

static void tcf_pernet_del_id_list(unsigned int id)
{
        struct tc_act_pernet_id *id_ptr;

        mutex_lock(&act_id_mutex);
        list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
                if (id_ptr->id == id) {
                        list_del(&id_ptr->list);
                        kfree(id_ptr);
                        break;
                }
        }
        mutex_unlock(&act_id_mutex);
}

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)
                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;

        if (ops->id) {
                ret = tcf_pernet_add_id_list(*ops->id);
                if (ret)
                        goto err_id;
        }

        write_lock(&act_mod_lock);
        list_for_each_entry(a, &act_base, head) {
                if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
                        ret = -EEXIST;
                        goto err_out;
                }
        }
        list_add_tail(&act->head, &act_base);
        write_unlock(&act_mod_lock);

        return 0;

err_out:
        write_unlock(&act_mod_lock);
        if (ops->id)
                tcf_pernet_del_id_list(*ops->id);
err_id:
        unregister_pernet_subsys(ops);
        return ret;
}
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);
                if (ops->id)
                        tcf_pernet_del_id_list(*ops->id);
        }
        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 up to 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;
                }

                if (tc_act_skip_sw(a->tcfa_flags))
                        continue;

                repeat_ttl = 32;
repeat:
                ret = tc_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))) {
                                tcf_set_drop_reason(skb,
                                                    SKB_DROP_REASON_TC_CHAIN_NOTFOUND);
                                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;

        tcf_act_for_each_action(i, a, actions) {
                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);
}

static void tcf_action_put_many(struct tc_action *actions[])
{
        struct tc_action *a;
        int i;

        tcf_act_for_each_action(i, a, actions) {
                const struct tc_action_ops *ops = a->ops;
                if (tcf_action_put(a))
                        module_put(ops->owner);
        }
}

static void tca_put_bound_many(struct tc_action *actions[], int init_res[])
{
        struct tc_action *a;
        int i;

        tcf_act_for_each_action(i, a, actions) {
                const struct tc_action_ops *ops = a->ops;

                if (init_res[i] == ACT_P_CREATED)
                        continue;

                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);
}

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;

        tcf_act_for_each_action(i, a, actions) {
                nest = nla_nest_start_noflag(skb, i + 1);
                if (nest == NULL)
                        goto nla_put_failure;
                err = terse ? tcf_action_dump_terse(skb, a, false) :
                        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_obj(*c);
        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_FLAGS_SKIP_HW |
                                                        TCA_ACT_FLAGS_SKIP_SW),
        [TCA_ACT_HW_STATS]      = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
};

void tcf_idr_insert_many(struct tc_action *actions[], int init_res[])
{
        struct tc_action *a;
        int i;

        tcf_act_for_each_action(i, a, actions) {
                struct tcf_idrinfo *idrinfo;

                if (init_res[i] == ACT_P_BOUND)
                        continue;

                idrinfo = a->idrinfo;
                mutex_lock(&idrinfo->lock);
                /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
                idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
                mutex_unlock(&idrinfo->lock);
        }
}

struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags,
                                         struct netlink_ext_ack *extack)
{
        bool police = flags & TCA_ACT_FLAGS_POLICE;
        struct nlattr *tb[TCA_ACT_MAX + 1];
        struct tc_action_ops *a_o;
        char act_name[IFNAMSIZ];
        struct nlattr *kind;
        int err;

        if (!police) {
                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_strscpy(act_name, kind, IFNAMSIZ) < 0) {
                        NL_SET_ERR_MSG(extack, "TC action name too long");
                        return ERR_PTR(err);
                }
        } else {
                if (strscpy(act_name, "police", IFNAMSIZ) < 0) {
                        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
                bool rtnl_held = !(flags & TCA_ACT_FLAGS_NO_RTNL);

                if (rtnl_held)
                        rtnl_unlock();
                request_module(NET_ACT_ALIAS_PREFIX "%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,
                                    struct tc_action_ops *a_o, int *init_res,
                                    u32 flags, struct netlink_ext_ack *extack)
{
        bool police = flags & TCA_ACT_FLAGS_POLICE;
        struct nla_bitfield32 userflags = { 0, 0 };
        struct tc_cookie *user_cookie = NULL;
        u8 hw_stats = TCA_ACT_HW_STATS_ANY;
        struct nlattr *tb[TCA_ACT_MAX + 1];
        struct tc_action *a;
        int err;

        /* backward compatibility for policer */
        if (!police) {
                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]) {
                        user_cookie = nla_memdup_cookie(tb);
                        if (!user_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]) {
                        userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
                        if (!tc_act_flags_valid(userflags.value)) {
                                err = -EINVAL;
                                goto err_out;
                        }
                }

                err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
                                userflags.value | flags, extack);
        } else {
                err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
                                extack);
        }
        if (err < 0)
                goto err_out;
        *init_res = err;

        if (!police && tb[TCA_ACT_COOKIE])
                tcf_set_action_cookie(&a->user_cookie, user_cookie);

        if (!police)
                a->hw_stats = hw_stats;

        return a;

err_out:
        if (user_cookie) {
                kfree(user_cookie->data);
                kfree(user_cookie);
        }
        return ERR_PTR(err);
}

static bool tc_act_bind(u32 flags)
{
        return !!(flags & TCA_ACT_FLAGS_BIND);
}

/* 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, struct tc_action *actions[],
                    int init_res[], size_t *attr_size,
                    u32 flags, u32 fl_flags,
                    struct netlink_ext_ack *extack)
{
        struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
        struct nlattr *tb[TCA_ACT_MAX_PRIO + 2];
        struct tc_action *act;
        size_t sz = 0;
        int err;
        int i;

        err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO + 1, nla, NULL,
                                          extack);
        if (err < 0)
                return err;

        /* The nested attributes are parsed as types, but they are really an
         * array of actions. So we parse one more than we can handle, and return
         * an error if the last one is set (as that indicates that the request
         * contained more than the maximum number of actions).
         */
        if (tb[TCA_ACT_MAX_PRIO + 1]) {
                NL_SET_ERR_MSG_FMT(extack,
                                   "Only %d actions supported per filter",
                                   TCA_ACT_MAX_PRIO);
                return -EINVAL;
        }

        for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
                struct tc_action_ops *a_o;

                a_o = tc_action_load_ops(tb[i], flags, 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, ops[i - 1],
                                        &init_res[i - 1], flags, 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;
                if (tc_act_bind(flags)) {
                        bool skip_sw = tc_skip_sw(fl_flags);
                        bool skip_hw = tc_skip_hw(fl_flags);

                        if (tc_act_bind(act->tcfa_flags)) {
                                /* Action is created by classifier and is not
                                 * standalone. Check that the user did not set
                                 * any action flags different than the
                                 * classifier flags, and inherit the flags from
                                 * the classifier for the compatibility case
                                 * where no flags were specified at all.
                                 */
                                if ((tc_act_skip_sw(act->tcfa_flags) && !skip_sw) ||
                                    (tc_act_skip_hw(act->tcfa_flags) && !skip_hw)) {
                                        NL_SET_ERR_MSG(extack,
                                                       "Mismatch between action and filter offload flags");
                                        err = -EINVAL;
                                        goto err;
                                }
                                if (skip_sw)
                                        act->tcfa_flags |= TCA_ACT_FLAGS_SKIP_SW;
                                if (skip_hw)
                                        act->tcfa_flags |= TCA_ACT_FLAGS_SKIP_HW;
                                continue;
                        }

                        /* Action is standalone */
                        if (skip_sw != tc_act_skip_sw(act->tcfa_flags) ||
                            skip_hw != tc_act_skip_hw(act->tcfa_flags)) {
                                NL_SET_ERR_MSG(extack,
                                               "Mismatch between action and filter offload flags");
                                err = -EINVAL;
                                goto err;
                        }
                } else {
                        err = tcf_action_offload_add(act, extack);
                        if (tc_act_skip_sw(act->tcfa_flags) && err)
                                goto err;
                }
        }

        /* 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, init_res);

        *attr_size = tcf_action_full_attrs_size(sz);
        err = i - 1;
        goto err_mod;

err:
        tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND);
err_mod:
        for (i = 0; i < TCA_ACT_MAX_PRIO && ops[i]; 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_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);

                this_cpu_ptr(a->cpu_qstats)->drops += drops;

                if (hw)
                        _bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
                                       bytes, packets);
                return;
        }

        _bstats_update(&a->tcfa_bstats, bytes, packets);
        atomic_add(drops, &a->tcfa_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)
{
        struct gnet_stats_queue qstats = {0};
        struct gnet_dump d;
        int err = 0;

        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;

        qstats.drops = atomic_read(&p->tcfa_drops);
        qstats.overlimits = atomic_read(&p->tcfa_overlimits);

        if (gnet_stats_copy_basic(&d, p->cpu_bstats,
                                  &p->tcfa_bstats, false) < 0 ||
            gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
                                     &p->tcfa_bstats_hw, false) < 0 ||
            gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
            gnet_stats_copy_queue(&d, p->cpu_qstats,
                                  &qstats,
                                  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 netlink_ext_ack *extack)
{
        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;

        if (extack && extack->_msg &&
            nla_put_string(skb, TCA_ROOT_EXT_WARN_MSG, extack->_msg))
                goto out_nlmsg_trim;

        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, NULL) <= 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 (__tcf_idr_search(net, ops, &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 = __tcf_generic_walker(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)
                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[])
{
        struct tc_action *a;
        int i;

        tcf_act_for_each_action(i, a, actions) {
                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 struct sk_buff *tcf_reoffload_del_notify_msg(struct net *net,
                                                    struct tc_action *action)
{
        size_t attr_size = tcf_action_fill_size(action);
        struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
                [0] = action,
        };
        struct sk_buff *skb;

        skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
        if (!skb)
                return ERR_PTR(-ENOBUFS);

        if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1, NULL) <= 0) {
                kfree_skb(skb);
                return ERR_PTR(-EINVAL);
        }

        return skb;
}

static int tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
{
        const struct tc_action_ops *ops = action->ops;
        struct sk_buff *skb;
        int ret;

        if (!rtnl_notify_needed(net, 0, RTNLGRP_TC)) {
                skb = NULL;
        } else {
                skb = tcf_reoffload_del_notify_msg(net, action);
                if (IS_ERR(skb))
                        return PTR_ERR(skb);
        }

        ret = tcf_idr_release_unsafe(action);
        if (ret == ACT_P_DELETED) {
                module_put(ops->owner);
                ret = rtnetlink_maybe_send(skb, net, 0, RTNLGRP_TC, 0);
        } else {
                kfree_skb(skb);
        }

        return ret;
}

int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
                            void *cb_priv, bool add)
{
        struct tc_act_pernet_id *id_ptr;
        struct tcf_idrinfo *idrinfo;
        struct tc_action_net *tn;
        struct tc_action *p;
        unsigned int act_id;
        unsigned long tmp;
        unsigned long id;
        struct idr *idr;
        struct net *net;
        int ret;

        if (!cb)
                return -EINVAL;

        down_read(&net_rwsem);
        mutex_lock(&act_id_mutex);

        for_each_net(net) {
                list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
                        act_id = id_ptr->id;
                        tn = net_generic(net, act_id);
                        if (!tn)
                                continue;
                        idrinfo = tn->idrinfo;
                        if (!idrinfo)
                                continue;

                        mutex_lock(&idrinfo->lock);
                        idr = &idrinfo->action_idr;
                        idr_for_each_entry_ul(idr, p, tmp, id) {
                                if (IS_ERR(p) || tc_act_bind(p->tcfa_flags))
                                        continue;
                                if (add) {
                                        tcf_action_offload_add_ex(p, NULL, cb,
                                                                  cb_priv);
                                        continue;
                                }

                                /* cb unregister to update hw count */
                                ret = tcf_action_offload_del_ex(p, cb, cb_priv);
                                if (ret < 0)
                                        continue;
                                if (tc_act_skip_sw(p->tcfa_flags) &&
                                    !tc_act_in_hw(p))
                                        tcf_reoffload_del_notify(net, p);
                        }
                        mutex_unlock(&idrinfo->lock);
                }
        }
        mutex_unlock(&act_id_mutex);
        up_read(&net_rwsem);

        return 0;
}

static struct sk_buff *tcf_del_notify_msg(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;

        skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
        if (!skb)
                return ERR_PTR(-ENOBUFS);

        if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
                         0, 2, extack) <= 0) {
                NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
                kfree_skb(skb);
                return ERR_PTR(-EINVAL);
        }

        return skb;
}

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)
{
        struct sk_buff *skb;
        int ret;

        if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
                skb = NULL;
        } else {
                skb = tcf_del_notify_msg(net, n, actions, portid, attr_size,
                                         extack);
                if (IS_ERR(skb))
                        return PTR_ERR(skb);
        }

        /* 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;
        }

        return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
                                    n->nlmsg_flags & NLM_F_ECHO);
}

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 struct sk_buff *tcf_add_notify_msg(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;

        skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
        if (!skb)
                return ERR_PTR(-ENOBUFS);

        if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
                         RTM_NEWACTION, 0, 0, extack) <= 0) {
                NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
                kfree_skb(skb);
                return ERR_PTR(-EINVAL);
        }

        return skb;
}

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;

        if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
                skb = NULL;
        } else {
                skb = tcf_add_notify_msg(net, n, actions, portid, attr_size,
                                         extack);
                if (IS_ERR(skb))
                        return PTR_ERR(skb);
        }

        return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
                                    n->nlmsg_flags & NLM_F_ECHO);
}

static int tcf_action_add(struct net *net, struct nlattr *nla,
                          struct nlmsghdr *n, u32 portid, u32 flags,
                          struct netlink_ext_ack *extack)
{
        size_t attr_size = 0;
        int loop, ret;
        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, actions, init_res,
                                      &attr_size, flags, 0, extack);
                if (ret != -EAGAIN)
                        break;
        }

        if (ret < 0)
                return ret;

        ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);

        /* only put bound actions */
        tca_put_bound_many(actions, init_res);

        return ret;
}

static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
        [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
                                                 TCA_ACT_FLAG_TERSE_DUMP),
        [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;
        u32 flags = 0;
        int ret = 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)
                        flags = TCA_ACT_FLAGS_REPLACE;
                ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags,
                                     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 = __tcf_generic_walker(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 const struct rtnl_msg_handler tc_action_rtnl_msg_handlers[] __initconst = {
        {.msgtype = RTM_NEWACTION, .doit = tc_ctl_action},
        {.msgtype = RTM_DELACTION, .doit = tc_ctl_action},
        {.msgtype = RTM_GETACTION, .doit = tc_ctl_action,
         .dumpit = tc_dump_action},
};

static int __init tc_action_init(void)
{
        rtnl_register_many(tc_action_rtnl_msg_handlers);
        return 0;
}

subsys_initcall(tc_action_init);