net/sched/act_police.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * net/sched/act_police.c	Input police filter
  *
  * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  * 		J Hadi Salim (action changes)
  */

 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/skbuff.h>
 #include <linux/rtnetlink.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <net/act_api.h>
 #include <net/netlink.h>
 #include <net/pkt_cls.h>
 #include <net/tc_act/tc_police.h>

 /* Each policer is serialized by its individual spinlock */

 static unsigned int police_net_id;
 static struct tc_action_ops act_police_ops;

 static int tcf_police_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, police_net_id);

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

 static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
 	[TCA_POLICE_RATE]	= { .len = TC_RTAB_SIZE },
 	[TCA_POLICE_PEAKRATE]	= { .len = TC_RTAB_SIZE },
 	[TCA_POLICE_AVRATE]	= { .type = NLA_U32 },
 	[TCA_POLICE_RESULT]	= { .type = NLA_U32 },
 	[TCA_POLICE_RATE64]     = { .type = NLA_U64 },
 	[TCA_POLICE_PEAKRATE64] = { .type = NLA_U64 },
 };

 static int tcf_police_init(struct net *net, struct nlattr *nla,
 			       struct nlattr *est, struct tc_action **a,
 			       int ovr, int bind, bool rtnl_held,
 			       struct tcf_proto *tp, u32 flags,
 			       struct netlink_ext_ack *extack)
 {
 	int ret = 0, tcfp_result = TC_ACT_OK, err, size;
 	struct nlattr *tb[TCA_POLICE_MAX + 1];
 	struct tcf_chain *goto_ch = NULL;
 	struct tc_police *parm;
 	struct tcf_police *police;
 	struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
 	struct tc_action_net *tn = net_generic(net, police_net_id);
 	struct tcf_police_params *new;
 	bool exists = false;
 	u32 index;
 	u64 rate64, prate64;

 	if (nla == NULL)
 		return -EINVAL;

 	err = nla_parse_nested_deprecated(tb, TCA_POLICE_MAX, nla,
 					  police_policy, NULL);
 	if (err < 0)
 		return err;

 	if (tb[TCA_POLICE_TBF] == NULL)
 		return -EINVAL;
 	size = nla_len(tb[TCA_POLICE_TBF]);
 	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
 		return -EINVAL;

 	parm = nla_data(tb[TCA_POLICE_TBF]);
 	index = parm->index;
 	err = tcf_idr_check_alloc(tn, &index, a, bind);
 	if (err < 0)
 		return err;
 	exists = err;
 	if (exists && bind)
 		return 0;

 	if (!exists) {
 		ret = tcf_idr_create(tn, index, NULL, a,
 				     &act_police_ops, bind, true, 0);
 		if (ret) {
 			tcf_idr_cleanup(tn, index);
 			return ret;
 		}
 		ret = ACT_P_CREATED;
 		spin_lock_init(&(to_police(*a)->tcfp_lock));
 	} else if (!ovr) {
 		tcf_idr_release(*a, bind);
 		return -EEXIST;
 	}
 	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
 	if (err < 0)
 		goto release_idr;

 	police = to_police(*a);
 	if (parm->rate.rate) {
 		err = -ENOMEM;
 		R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE], NULL);
 		if (R_tab == NULL)
 			goto failure;

 		if (parm->peakrate.rate) {
 			P_tab = qdisc_get_rtab(&parm->peakrate,
 					       tb[TCA_POLICE_PEAKRATE], NULL);
 			if (P_tab == NULL)
 				goto failure;
 		}
 	}

 	if (est) {
 		err = gen_replace_estimator(&police->tcf_bstats,
 					    police->common.cpu_bstats,
 					    &police->tcf_rate_est,
 					    &police->tcf_lock,
 					    NULL, est);
 		if (err)
 			goto failure;
 	} else if (tb[TCA_POLICE_AVRATE] &&
 		   (ret == ACT_P_CREATED ||
 		    !gen_estimator_active(&police->tcf_rate_est))) {
 		err = -EINVAL;
 		goto failure;
 	}

 	if (tb[TCA_POLICE_RESULT]) {
 		tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
 		if (TC_ACT_EXT_CMP(tcfp_result, TC_ACT_GOTO_CHAIN)) {
 			NL_SET_ERR_MSG(extack,
 				       "goto chain not allowed on fallback");
 			err = -EINVAL;
 			goto failure;
 		}
 	}

 	new = kzalloc(sizeof(*new), GFP_KERNEL);
 	if (unlikely(!new)) {
 		err = -ENOMEM;
 		goto failure;
 	}

 	/* No failure allowed after this point */
 	new->tcfp_result = tcfp_result;
 	new->tcfp_mtu = parm->mtu;
 	if (!new->tcfp_mtu) {
 		new->tcfp_mtu = ~0;
 		if (R_tab)
 			new->tcfp_mtu = 255 << R_tab->rate.cell_log;
 	}
 	if (R_tab) {
 		new->rate_present = true;
 		rate64 = tb[TCA_POLICE_RATE64] ?
 			 nla_get_u64(tb[TCA_POLICE_RATE64]) : 0;
 		psched_ratecfg_precompute(&new->rate, &R_tab->rate, rate64);
 		qdisc_put_rtab(R_tab);
 	} else {
 		new->rate_present = false;
 	}
 	if (P_tab) {
 		new->peak_present = true;
 		prate64 = tb[TCA_POLICE_PEAKRATE64] ?
 			  nla_get_u64(tb[TCA_POLICE_PEAKRATE64]) : 0;
 		psched_ratecfg_precompute(&new->peak, &P_tab->rate, prate64);
 		qdisc_put_rtab(P_tab);
 	} else {
 		new->peak_present = false;
 	}

 	new->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
 	if (new->peak_present)
 		new->tcfp_mtu_ptoks = (s64)psched_l2t_ns(&new->peak,
 							 new->tcfp_mtu);

 	if (tb[TCA_POLICE_AVRATE])
 		new->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);

 	spin_lock_bh(&police->tcf_lock);
 	spin_lock_bh(&police->tcfp_lock);
 	police->tcfp_t_c = ktime_get_ns();
 	police->tcfp_toks = new->tcfp_burst;
 	if (new->peak_present)
 		police->tcfp_ptoks = new->tcfp_mtu_ptoks;
 	spin_unlock_bh(&police->tcfp_lock);
 	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
 	new = rcu_replace_pointer(police->params,
 				  new,
 				  lockdep_is_held(&police->tcf_lock));
 	spin_unlock_bh(&police->tcf_lock);

 	if (goto_ch)
 		tcf_chain_put_by_act(goto_ch);
 	if (new)
 		kfree_rcu(new, rcu);

 	if (ret == ACT_P_CREATED)
 		tcf_idr_insert(tn, *a);
 	return ret;

 failure:
 	qdisc_put_rtab(P_tab);
 	qdisc_put_rtab(R_tab);
 	if (goto_ch)
 		tcf_chain_put_by_act(goto_ch);
 release_idr:
 	tcf_idr_release(*a, bind);
 	return err;
 }

 static int tcf_police_act(struct sk_buff *skb, const struct tc_action *a,
 			  struct tcf_result *res)
 {
 	struct tcf_police *police = to_police(a);
 	struct tcf_police_params *p;
 	s64 now, toks, ptoks = 0;
 	int ret;

 	tcf_lastuse_update(&police->tcf_tm);
 	bstats_cpu_update(this_cpu_ptr(police->common.cpu_bstats), skb);

 	ret = READ_ONCE(police->tcf_action);
 	p = rcu_dereference_bh(police->params);

 	if (p->tcfp_ewma_rate) {
 		struct gnet_stats_rate_est64 sample;

 		if (!gen_estimator_read(&police->tcf_rate_est, &sample) ||
 		    sample.bps >= p->tcfp_ewma_rate)
 			goto inc_overlimits;
 	}

 	if (qdisc_pkt_len(skb) <= p->tcfp_mtu) {
 		if (!p->rate_present) {
 			ret = p->tcfp_result;
 			goto end;
 		}

 		now = ktime_get_ns();
 		spin_lock_bh(&police->tcfp_lock);
 		toks = min_t(s64, now - police->tcfp_t_c, p->tcfp_burst);
 		if (p->peak_present) {
 			ptoks = toks + police->tcfp_ptoks;
 			if (ptoks > p->tcfp_mtu_ptoks)
 				ptoks = p->tcfp_mtu_ptoks;
 			ptoks -= (s64)psched_l2t_ns(&p->peak,
 						    qdisc_pkt_len(skb));
 		}
 		toks += police->tcfp_toks;
 		if (toks > p->tcfp_burst)
 			toks = p->tcfp_burst;
 		toks -= (s64)psched_l2t_ns(&p->rate, qdisc_pkt_len(skb));
 		if ((toks|ptoks) >= 0) {
 			police->tcfp_t_c = now;
 			police->tcfp_toks = toks;
 			police->tcfp_ptoks = ptoks;
 			spin_unlock_bh(&police->tcfp_lock);
 			ret = p->tcfp_result;
 			goto inc_drops;
 		}
 		spin_unlock_bh(&police->tcfp_lock);
 	}

 inc_overlimits:
 	qstats_overlimit_inc(this_cpu_ptr(police->common.cpu_qstats));
 inc_drops:
 	if (ret == TC_ACT_SHOT)
 		qstats_drop_inc(this_cpu_ptr(police->common.cpu_qstats));
 end:
 	return ret;
 }

 static void tcf_police_cleanup(struct tc_action *a)
 {
 	struct tcf_police *police = to_police(a);
 	struct tcf_police_params *p;

 	p = rcu_dereference_protected(police->params, 1);
 	if (p)
 		kfree_rcu(p, rcu);
 }

 static void tcf_police_stats_update(struct tc_action *a,
 				    u64 bytes, u32 packets,
 				    u64 lastuse, bool hw)
 {
 	struct tcf_police *police = to_police(a);
 	struct tcf_t *tm = &police->tcf_tm;

 	tcf_action_update_stats(a, bytes, packets, false, hw);
 	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
 }

 static int tcf_police_dump(struct sk_buff *skb, struct tc_action *a,
 			       int bind, int ref)
 {
 	unsigned char *b = skb_tail_pointer(skb);
 	struct tcf_police *police = to_police(a);
 	struct tcf_police_params *p;
 	struct tc_police opt = {
 		.index = police->tcf_index,
 		.refcnt = refcount_read(&police->tcf_refcnt) - ref,
 		.bindcnt = atomic_read(&police->tcf_bindcnt) - bind,
 	};
 	struct tcf_t t;

 	spin_lock_bh(&police->tcf_lock);
 	opt.action = police->tcf_action;
 	p = rcu_dereference_protected(police->params,
 				      lockdep_is_held(&police->tcf_lock));
 	opt.mtu = p->tcfp_mtu;
 	opt.burst = PSCHED_NS2TICKS(p->tcfp_burst);
 	if (p->rate_present) {
 		psched_ratecfg_getrate(&opt.rate, &p->rate);
 		if ((police->params->rate.rate_bytes_ps >= (1ULL << 32)) &&
 		    nla_put_u64_64bit(skb, TCA_POLICE_RATE64,
 				      police->params->rate.rate_bytes_ps,
 				      TCA_POLICE_PAD))
 			goto nla_put_failure;
 	}
 	if (p->peak_present) {
 		psched_ratecfg_getrate(&opt.peakrate, &p->peak);
 		if ((police->params->peak.rate_bytes_ps >= (1ULL << 32)) &&
 		    nla_put_u64_64bit(skb, TCA_POLICE_PEAKRATE64,
 				      police->params->peak.rate_bytes_ps,
 				      TCA_POLICE_PAD))
 			goto nla_put_failure;
 	}
 	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
 		goto nla_put_failure;
 	if (p->tcfp_result &&
 	    nla_put_u32(skb, TCA_POLICE_RESULT, p->tcfp_result))
 		goto nla_put_failure;
 	if (p->tcfp_ewma_rate &&
 	    nla_put_u32(skb, TCA_POLICE_AVRATE, p->tcfp_ewma_rate))
 		goto nla_put_failure;

 	tcf_tm_dump(&t, &police->tcf_tm);
 	if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
 		goto nla_put_failure;
 	spin_unlock_bh(&police->tcf_lock);

 	return skb->len;

 nla_put_failure:
 	spin_unlock_bh(&police->tcf_lock);
 	nlmsg_trim(skb, b);
 	return -1;
 }

 static int tcf_police_search(struct net *net, struct tc_action **a, u32 index)
 {
 	struct tc_action_net *tn = net_generic(net, police_net_id);

 	return tcf_idr_search(tn, a, index);
 }

 MODULE_AUTHOR("Alexey Kuznetsov");
 MODULE_DESCRIPTION("Policing actions");
 MODULE_LICENSE("GPL");

 static struct tc_action_ops act_police_ops = {
 	.kind		=	"police",
 	.id		=	TCA_ID_POLICE,
 	.owner		=	THIS_MODULE,
 	.stats_update	=	tcf_police_stats_update,
 	.act		=	tcf_police_act,
 	.dump		=	tcf_police_dump,
 	.init		=	tcf_police_init,
 	.walk		=	tcf_police_walker,
 	.lookup		=	tcf_police_search,
 	.cleanup	=	tcf_police_cleanup,
 	.size		=	sizeof(struct tcf_police),
 };

 static __net_init int police_init_net(struct net *net)
 {
 	struct tc_action_net *tn = net_generic(net, police_net_id);

 	return tc_action_net_init(net, tn, &act_police_ops);
 }

 static void __net_exit police_exit_net(struct list_head *net_list)
 {
 	tc_action_net_exit(net_list, police_net_id);
 }

 static struct pernet_operations police_net_ops = {
 	.init = police_init_net,
 	.exit_batch = police_exit_net,
 	.id   = &police_net_id,
 	.size = sizeof(struct tc_action_net),
 };

 static int __init police_init_module(void)
 {
 	return tcf_register_action(&act_police_ops, &police_net_ops);
 }

 static void __exit police_cleanup_module(void)
 {
 	tcf_unregister_action(&act_police_ops, &police_net_ops);
 }

 module_init(police_init_module);
 module_exit(police_cleanup_module);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* net/sched/act_police.c Input police filter
	*
	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	* J Hadi Salim (action changes)
	*/

	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/kernel.h>
	#include <linux/string.h>
	#include <linux/errno.h>
	#include <linux/skbuff.h>
	#include <linux/rtnetlink.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <net/act_api.h>
	#include <net/netlink.h>
	#include <net/pkt_cls.h>
	#include <net/tc_act/tc_police.h>

	/* Each policer is serialized by its individual spinlock */

	static unsigned int police_net_id;
	static struct tc_action_ops act_police_ops;

	static int tcf_police_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, police_net_id);

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

	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	[TCA_POLICE_RATE64] = { .type = NLA_U64 },
	[TCA_POLICE_PEAKRATE64] = { .type = NLA_U64 },
	};

	static int tcf_police_init(struct net net, struct nlattr nla,
	struct nlattr est, struct tc_action *a,
	int ovr, int bind, bool rtnl_held,
	struct tcf_proto *tp, u32 flags,
	struct netlink_ext_ack *extack)
	{
	int ret = 0, tcfp_result = TC_ACT_OK, err, size;
	struct nlattr *tb[TCA_POLICE_MAX + 1];
	struct tcf_chain *goto_ch = NULL;
	struct tc_police *parm;
	struct tcf_police *police;
	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
	struct tc_action_net *tn = net_generic(net, police_net_id);
	struct tcf_police_params *new;
	bool exists = false;
	u32 index;
	u64 rate64, prate64;

	if (nla == NULL)
	return -EINVAL;

	err = nla_parse_nested_deprecated(tb, TCA_POLICE_MAX, nla,
	police_policy, NULL);
	if (err < 0)
	return err;

	if (tb[TCA_POLICE_TBF] == NULL)
	return -EINVAL;
	size = nla_len(tb[TCA_POLICE_TBF]);
	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
	return -EINVAL;

	parm = nla_data(tb[TCA_POLICE_TBF]);
	index = parm->index;
	err = tcf_idr_check_alloc(tn, &index, a, bind);
	if (err < 0)
	return err;
	exists = err;
	if (exists && bind)
	return 0;

	if (!exists) {
	ret = tcf_idr_create(tn, index, NULL, a,
	&act_police_ops, bind, true, 0);
	if (ret) {
	tcf_idr_cleanup(tn, index);
	return ret;
	}
	ret = ACT_P_CREATED;
	spin_lock_init(&(to_police(*a)->tcfp_lock));
	} else if (!ovr) {
	tcf_idr_release(*a, bind);
	return -EEXIST;
	}
	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	if (err < 0)
	goto release_idr;

	police = to_police(*a);
	if (parm->rate.rate) {
	err = -ENOMEM;
	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE], NULL);
	if (R_tab == NULL)
	goto failure;

	if (parm->peakrate.rate) {
	P_tab = qdisc_get_rtab(&parm->peakrate,
	tb[TCA_POLICE_PEAKRATE], NULL);
	if (P_tab == NULL)
	goto failure;
	}
	}

	if (est) {
	err = gen_replace_estimator(&police->tcf_bstats,
	police->common.cpu_bstats,
	&police->tcf_rate_est,
	&police->tcf_lock,
	NULL, est);
	if (err)
	goto failure;
	} else if (tb[TCA_POLICE_AVRATE] &&
	(ret == ACT_P_CREATED \|\|
	!gen_estimator_active(&police->tcf_rate_est))) {
	err = -EINVAL;
	goto failure;
	}

	if (tb[TCA_POLICE_RESULT]) {
	tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
	if (TC_ACT_EXT_CMP(tcfp_result, TC_ACT_GOTO_CHAIN)) {
	NL_SET_ERR_MSG(extack,
	"goto chain not allowed on fallback");
	err = -EINVAL;
	goto failure;
	}
	}

	new = kzalloc(sizeof(*new), GFP_KERNEL);
	if (unlikely(!new)) {
	err = -ENOMEM;
	goto failure;
	}

	/* No failure allowed after this point */
	new->tcfp_result = tcfp_result;
	new->tcfp_mtu = parm->mtu;
	if (!new->tcfp_mtu) {
	new->tcfp_mtu = ~0;
	if (R_tab)
	new->tcfp_mtu = 255 << R_tab->rate.cell_log;
	}
	if (R_tab) {
	new->rate_present = true;
	rate64 = tb[TCA_POLICE_RATE64] ?
	nla_get_u64(tb[TCA_POLICE_RATE64]) : 0;
	psched_ratecfg_precompute(&new->rate, &R_tab->rate, rate64);
	qdisc_put_rtab(R_tab);
	} else {
	new->rate_present = false;
	}
	if (P_tab) {
	new->peak_present = true;
	prate64 = tb[TCA_POLICE_PEAKRATE64] ?
	nla_get_u64(tb[TCA_POLICE_PEAKRATE64]) : 0;
	psched_ratecfg_precompute(&new->peak, &P_tab->rate, prate64);
	qdisc_put_rtab(P_tab);
	} else {
	new->peak_present = false;
	}

	new->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
	if (new->peak_present)
	new->tcfp_mtu_ptoks = (s64)psched_l2t_ns(&new->peak,
	new->tcfp_mtu);

	if (tb[TCA_POLICE_AVRATE])
	new->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);

	spin_lock_bh(&police->tcf_lock);
	spin_lock_bh(&police->tcfp_lock);
	police->tcfp_t_c = ktime_get_ns();
	police->tcfp_toks = new->tcfp_burst;
	if (new->peak_present)
	police->tcfp_ptoks = new->tcfp_mtu_ptoks;
	spin_unlock_bh(&police->tcfp_lock);
	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
	new = rcu_replace_pointer(police->params,
	new,
	lockdep_is_held(&police->tcf_lock));
	spin_unlock_bh(&police->tcf_lock);

	if (goto_ch)
	tcf_chain_put_by_act(goto_ch);
	if (new)
	kfree_rcu(new, rcu);

	if (ret == ACT_P_CREATED)
	tcf_idr_insert(tn, *a);
	return ret;

	failure:
	qdisc_put_rtab(P_tab);
	qdisc_put_rtab(R_tab);
	if (goto_ch)
	tcf_chain_put_by_act(goto_ch);
	release_idr:
	tcf_idr_release(*a, bind);
	return err;
	}

	static int tcf_police_act(struct sk_buff skb, const struct tc_action a,
	struct tcf_result *res)
	{
	struct tcf_police *police = to_police(a);
	struct tcf_police_params *p;
	s64 now, toks, ptoks = 0;
	int ret;

	tcf_lastuse_update(&police->tcf_tm);
	bstats_cpu_update(this_cpu_ptr(police->common.cpu_bstats), skb);

	ret = READ_ONCE(police->tcf_action);
	p = rcu_dereference_bh(police->params);

	if (p->tcfp_ewma_rate) {
	struct gnet_stats_rate_est64 sample;

	if (!gen_estimator_read(&police->tcf_rate_est, &sample) \|\|
	sample.bps >= p->tcfp_ewma_rate)
	goto inc_overlimits;
	}

	if (qdisc_pkt_len(skb) <= p->tcfp_mtu) {
	if (!p->rate_present) {
	ret = p->tcfp_result;
	goto end;
	}

	now = ktime_get_ns();
	spin_lock_bh(&police->tcfp_lock);
	toks = min_t(s64, now - police->tcfp_t_c, p->tcfp_burst);
	if (p->peak_present) {
	ptoks = toks + police->tcfp_ptoks;
	if (ptoks > p->tcfp_mtu_ptoks)
	ptoks = p->tcfp_mtu_ptoks;
	ptoks -= (s64)psched_l2t_ns(&p->peak,
	qdisc_pkt_len(skb));
	}
	toks += police->tcfp_toks;
	if (toks > p->tcfp_burst)
	toks = p->tcfp_burst;
	toks -= (s64)psched_l2t_ns(&p->rate, qdisc_pkt_len(skb));
	if ((toks\|ptoks) >= 0) {
	police->tcfp_t_c = now;
	police->tcfp_toks = toks;
	police->tcfp_ptoks = ptoks;
	spin_unlock_bh(&police->tcfp_lock);
	ret = p->tcfp_result;
	goto inc_drops;
	}
	spin_unlock_bh(&police->tcfp_lock);
	}

	inc_overlimits:
	qstats_overlimit_inc(this_cpu_ptr(police->common.cpu_qstats));
	inc_drops:
	if (ret == TC_ACT_SHOT)
	qstats_drop_inc(this_cpu_ptr(police->common.cpu_qstats));
	end:
	return ret;
	}

	static void tcf_police_cleanup(struct tc_action *a)
	{
	struct tcf_police *police = to_police(a);
	struct tcf_police_params *p;

	p = rcu_dereference_protected(police->params, 1);
	if (p)
	kfree_rcu(p, rcu);
	}

	static void tcf_police_stats_update(struct tc_action *a,
	u64 bytes, u32 packets,
	u64 lastuse, bool hw)
	{
	struct tcf_police *police = to_police(a);
	struct tcf_t *tm = &police->tcf_tm;

	tcf_action_update_stats(a, bytes, packets, false, hw);
	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
	}

	static int tcf_police_dump(struct sk_buff skb, struct tc_action a,
	int bind, int ref)
	{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_police *police = to_police(a);
	struct tcf_police_params *p;
	struct tc_police opt = {
	.index = police->tcf_index,
	.refcnt = refcount_read(&police->tcf_refcnt) - ref,
	.bindcnt = atomic_read(&police->tcf_bindcnt) - bind,
	};
	struct tcf_t t;

	spin_lock_bh(&police->tcf_lock);
	opt.action = police->tcf_action;
	p = rcu_dereference_protected(police->params,
	lockdep_is_held(&police->tcf_lock));
	opt.mtu = p->tcfp_mtu;
	opt.burst = PSCHED_NS2TICKS(p->tcfp_burst);
	if (p->rate_present) {
	psched_ratecfg_getrate(&opt.rate, &p->rate);
	if ((police->params->rate.rate_bytes_ps >= (1ULL << 32)) &&
	nla_put_u64_64bit(skb, TCA_POLICE_RATE64,
	police->params->rate.rate_bytes_ps,
	TCA_POLICE_PAD))
	goto nla_put_failure;
	}
	if (p->peak_present) {
	psched_ratecfg_getrate(&opt.peakrate, &p->peak);
	if ((police->params->peak.rate_bytes_ps >= (1ULL << 32)) &&
	nla_put_u64_64bit(skb, TCA_POLICE_PEAKRATE64,
	police->params->peak.rate_bytes_ps,
	TCA_POLICE_PAD))
	goto nla_put_failure;
	}
	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
	goto nla_put_failure;
	if (p->tcfp_result &&
	nla_put_u32(skb, TCA_POLICE_RESULT, p->tcfp_result))
	goto nla_put_failure;
	if (p->tcfp_ewma_rate &&
	nla_put_u32(skb, TCA_POLICE_AVRATE, p->tcfp_ewma_rate))
	goto nla_put_failure;

	tcf_tm_dump(&t, &police->tcf_tm);
	if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
	goto nla_put_failure;
	spin_unlock_bh(&police->tcf_lock);

	return skb->len;

	nla_put_failure:
	spin_unlock_bh(&police->tcf_lock);
	nlmsg_trim(skb, b);
	return -1;
	}

	static int tcf_police_search(struct net net, struct tc_action *a, u32 index)
	{
	struct tc_action_net *tn = net_generic(net, police_net_id);

	return tcf_idr_search(tn, a, index);
	}

	MODULE_AUTHOR("Alexey Kuznetsov");
	MODULE_DESCRIPTION("Policing actions");
	MODULE_LICENSE("GPL");

	static struct tc_action_ops act_police_ops = {
	.kind = "police",
	.id = TCA_ID_POLICE,
	.owner = THIS_MODULE,
	.stats_update = tcf_police_stats_update,
	.act = tcf_police_act,
	.dump = tcf_police_dump,
	.init = tcf_police_init,
	.walk = tcf_police_walker,
	.lookup = tcf_police_search,
	.cleanup = tcf_police_cleanup,
	.size = sizeof(struct tcf_police),
	};

	static __net_init int police_init_net(struct net *net)
	{
	struct tc_action_net *tn = net_generic(net, police_net_id);

	return tc_action_net_init(net, tn, &act_police_ops);
	}

	static void __net_exit police_exit_net(struct list_head *net_list)
	{
	tc_action_net_exit(net_list, police_net_id);
	}

	static struct pernet_operations police_net_ops = {
	.init = police_init_net,
	.exit_batch = police_exit_net,
	.id = &police_net_id,
	.size = sizeof(struct tc_action_net),
	};

	static int __init police_init_module(void)
	{
	return tcf_register_action(&act_police_ops, &police_net_ops);
	}

	static void __exit police_cleanup_module(void)
	{
	tcf_unregister_action(&act_police_ops, &police_net_ops);
	}

	module_init(police_init_module);
	module_exit(police_cleanup_module);