[thirdparty/kernel/stable.git] / net / sched / act_police.c

/*
 * net/sched/act_police.c	Input police filter
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 * 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>

struct tcf_police_params {
	int			tcfp_result;
	u32			tcfp_ewma_rate;
	s64			tcfp_burst;
	u32			tcfp_mtu;
	s64			tcfp_mtu_ptoks;
	struct psched_ratecfg	rate;
	bool			rate_present;
	struct psched_ratecfg	peak;
	bool			peak_present;
	struct rcu_head rcu;
};

struct tcf_police {
	struct tc_action	common;
	struct tcf_police_params __rcu *params;

	spinlock_t		tcfp_lock ____cacheline_aligned_in_smp;
	s64			tcfp_toks;
	s64			tcfp_ptoks;
	s64			tcfp_t_c;
};

#define to_police(pc) ((struct tcf_police *)pc)

/* old policer structure from before tc actions */
struct tc_police_compat {
	u32			index;
	int			action;
	u32			limit;
	u32			burst;
	u32			mtu;
	struct tc_ratespec	rate;
	struct tc_ratespec	peakrate;
};

/* 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 },
};

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,
			       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;

	if (nla == NULL)
		return -EINVAL;

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

	if (!exists) {
		ret = tcf_idr_create(tn, parm->index, NULL, a,
				     &act_police_ops, bind, true);
		if (ret) {
			tcf_idr_cleanup(tn, parm->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;
		psched_ratecfg_precompute(&new->rate, &R_tab->rate, 0);
		qdisc_put_rtab(R_tab);
	} else {
		new->rate_present = false;
	}
	if (P_tab) {
		new->peak_present = true;
		psched_ratecfg_precompute(&new->peak, &P_tab->rate, 0);
		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);
	rcu_swap_protected(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 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 (p->peak_present)
		psched_ratecfg_getrate(&opt.peakrate, &p->peak);
	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;

	t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install);
	t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse);
	t.firstuse = jiffies_to_clock_t(jiffies - police->tcf_tm.firstuse);
	t.expires = jiffies_to_clock_t(police->tcf_tm.expires);
	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,
	.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(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);
Commit	Line	Data
1da177e4	1	/*
0c6965dd	2	* net/sched/act_police.c Input police filter
1da177e4 LT	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	10	* J Hadi Salim (action changes)
	11	*/
	12
1da177e4 LT	13	#include <linux/module.h>
	14	#include <linux/types.h>
	15	#include <linux/kernel.h>
1da177e4	16	#include <linux/string.h>
1da177e4	17	#include <linux/errno.h>
1da177e4	18	#include <linux/skbuff.h>
1da177e4 LT	19	#include <linux/rtnetlink.h>
1da177e4 LT	20	#include <linux/init.h>
5a0e3ad6	21	#include <linux/slab.h>
1da177e4	22	#include <net/act_api.h>
dc5fc579	23	#include <net/netlink.h>
d6124d6b	24	#include <net/pkt_cls.h>
1da177e4	25
2d550dba	26	struct tcf_police_params {
0e243218 JP	27	int tcfp_result;
0e243218 JP	28	u32 tcfp_ewma_rate;
c6d14ff1	29	s64 tcfp_burst;
0e243218	30	u32 tcfp_mtu;
c6d14ff1	31	s64 tcfp_mtu_ptoks;
c6d14ff1 JP	32	struct psched_ratecfg rate;
	33	bool rate_present;
	34	struct psched_ratecfg peak;
	35	bool peak_present;
2d550dba DC	36	struct rcu_head rcu;
	37	};
	38
	39	struct tcf_police {
	40	struct tc_action common;
	41	struct tcf_police_params __rcu *params;
f2cbd485 DC	42
	43	spinlock_t tcfp_lock ____cacheline_aligned_in_smp;
	44	s64 tcfp_toks;
	45	s64 tcfp_ptoks;
	46	s64 tcfp_t_c;
0e243218	47	};
a85a970a WC	48
a85a970a WC	49	#define to_police(pc) ((struct tcf_police *)pc)
0e243218	50
1e9b3d53	51	/* old policer structure from before tc actions */
cc7ec456	52	struct tc_police_compat {
1e9b3d53 PM	53	u32 index;
	54	int action;
	55	u32 limit;
	56	u32 burst;
	57	u32 mtu;
	58	struct tc_ratespec rate;
	59	struct tc_ratespec peakrate;
	60	};
	61
e9ce1cd3	62	/* Each policer is serialized by its individual spinlock */
1da177e4	63
c7d03a00	64	static unsigned int police_net_id;
a85a970a	65	static struct tc_action_ops act_police_ops;
ddf97ccd	66
2ac06347	67	static int tcf_police_walker(struct net net, struct sk_buff skb,
ddf97ccd	68	struct netlink_callback *cb, int type,
41780105 AA	69	const struct tc_action_ops *ops,
41780105 AA	70	struct netlink_ext_ack *extack)
1da177e4	71	{
ddf97ccd	72	struct tc_action_net *tn = net_generic(net, police_net_id);
1da177e4	73
b3620145	74	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
1da177e4	75	}
1da177e4	76
53b2bf3f PM	77	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	78	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	79	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	80	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	81	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	82	};
	83
2ac06347	84	static int tcf_police_init(struct net net, struct nlattr nla,
a85a970a	85	struct nlattr est, struct tc_action *a,
789871bb	86	int ovr, int bind, bool rtnl_held,
85d0966f	87	struct tcf_proto *tp,
589dad6d	88	struct netlink_ext_ack *extack)
1da177e4	89	{
fd6d4338	90	int ret = 0, tcfp_result = TC_ACT_OK, err, size;
7ba699c6	91	struct nlattr *tb[TCA_POLICE_MAX + 1];
d6124d6b	92	struct tcf_chain *goto_ch = NULL;
1da177e4	93	struct tc_police *parm;
e9ce1cd3	94	struct tcf_police *police;
1da177e4	95	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
ddf97ccd	96	struct tc_action_net *tn = net_generic(net, police_net_id);
2d550dba	97	struct tcf_police_params *new;
0852e455	98	bool exists = false;
1da177e4	99
cee63723	100	if (nla == NULL)
1da177e4 LT	101	return -EINVAL;
1da177e4 LT	102
fceb6435	103	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy, NULL);
cee63723 PM	104	if (err < 0)
	105	return err;
	106
7ba699c6	107	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	108	return -EINVAL;
7ba699c6	109	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	110	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	111	return -EINVAL;
0852e455	112
7ba699c6	113	parm = nla_data(tb[TCA_POLICE_TBF]);
0190c1d4 VB	114	err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
	115	if (err < 0)
	116	return err;
	117	exists = err;
0852e455 WC	118	if (exists && bind)
0852e455 WC	119	return 0;
1da177e4	120
0852e455	121	if (!exists) {
65a206c0	122	ret = tcf_idr_create(tn, parm->index, NULL, a,
93be42f9	123	&act_police_ops, bind, true);
0190c1d4 VB	124	if (ret) {
0190c1d4 VB	125	tcf_idr_cleanup(tn, parm->index);
a03e6fe5	126	return ret;
0190c1d4	127	}
a03e6fe5	128	ret = ACT_P_CREATED;
484afd1b	129	spin_lock_init(&(to_police(*a)->tcfp_lock));
4e8ddd7f	130	} else if (!ovr) {
65a206c0	131	tcf_idr_release(*a, bind);
4e8ddd7f	132	return -EEXIST;
1da177e4	133	}
d6124d6b DC	134	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	135	if (err < 0)
	136	goto release_idr;
1da177e4	137
a85a970a	138	police = to_police(*a);
1da177e4 LT	139	if (parm->rate.rate) {
1da177e4 LT	140	err = -ENOMEM;
e9bc3fa2	141	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE], NULL);
1da177e4 LT	142	if (R_tab == NULL)
1da177e4 LT	143	goto failure;
c1b56878	144
1da177e4 LT	145	if (parm->peakrate.rate) {
1da177e4 LT	146	P_tab = qdisc_get_rtab(&parm->peakrate,
e9bc3fa2	147	tb[TCA_POLICE_PEAKRATE], NULL);
71bcb09a	148	if (P_tab == NULL)
1da177e4	149	goto failure;
1da177e4 LT	150	}
1da177e4 LT	151	}
71bcb09a	152
71bcb09a	153	if (est) {
93be42f9 DC	154	err = gen_replace_estimator(&police->tcf_bstats,
93be42f9 DC	155	police->common.cpu_bstats,
71bcb09a	156	&police->tcf_rate_est,
edb09eb1 ED	157	&police->tcf_lock,
edb09eb1 ED	158	NULL, est);
71bcb09a	159	if (err)
74030603	160	goto failure;
a883bf56 JP	161	} else if (tb[TCA_POLICE_AVRATE] &&
a883bf56 JP	162	(ret == ACT_P_CREATED \|\|
1c0d32fd	163	!gen_estimator_active(&police->tcf_rate_est))) {
a883bf56	164	err = -EINVAL;
74030603	165	goto failure;
71bcb09a SH	166	}
71bcb09a SH	167
fd6d4338 DC	168	if (tb[TCA_POLICE_RESULT]) {
	169	tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
	170	if (TC_ACT_EXT_CMP(tcfp_result, TC_ACT_GOTO_CHAIN)) {
	171	NL_SET_ERR_MSG(extack,
	172	"goto chain not allowed on fallback");
	173	err = -EINVAL;
	174	goto failure;
	175	}
	176	}
	177
2d550dba DC	178	new = kzalloc(sizeof(*new), GFP_KERNEL);
	179	if (unlikely(!new)) {
	180	err = -ENOMEM;
	181	goto failure;
	182	}
	183
71bcb09a	184	/* No failure allowed after this point */
fd6d4338	185	new->tcfp_result = tcfp_result;
2d550dba DC	186	new->tcfp_mtu = parm->mtu;
	187	if (!new->tcfp_mtu) {
	188	new->tcfp_mtu = ~0;
c6d14ff1	189	if (R_tab)
2d550dba	190	new->tcfp_mtu = 255 << R_tab->rate.cell_log;
c6d14ff1 JP	191	}
c6d14ff1 JP	192	if (R_tab) {
2d550dba DC	193	new->rate_present = true;
2d550dba DC	194	psched_ratecfg_precompute(&new->rate, &R_tab->rate, 0);
c6d14ff1 JP	195	qdisc_put_rtab(R_tab);
c6d14ff1 JP	196	} else {
2d550dba	197	new->rate_present = false;
1da177e4	198	}
c6d14ff1	199	if (P_tab) {
2d550dba DC	200	new->peak_present = true;
2d550dba DC	201	psched_ratecfg_precompute(&new->peak, &P_tab->rate, 0);
c6d14ff1 JP	202	qdisc_put_rtab(P_tab);
c6d14ff1 JP	203	} else {
2d550dba	204	new->peak_present = false;
1da177e4 LT	205	}
1da177e4 LT	206
2d550dba	207	new->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
f2cbd485	208	if (new->peak_present)
2d550dba DC	209	new->tcfp_mtu_ptoks = (s64)psched_l2t_ns(&new->peak,
2d550dba DC	210	new->tcfp_mtu);
1da177e4	211
7ba699c6	212	if (tb[TCA_POLICE_AVRATE])
2d550dba	213	new->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	214
2d550dba	215	spin_lock_bh(&police->tcf_lock);
f2cbd485 DC	216	spin_lock_bh(&police->tcfp_lock);
	217	police->tcfp_t_c = ktime_get_ns();
	218	police->tcfp_toks = new->tcfp_burst;
	219	if (new->peak_present)
	220	police->tcfp_ptoks = new->tcfp_mtu_ptoks;
	221	spin_unlock_bh(&police->tcfp_lock);
d6124d6b	222	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
2d550dba DC	223	rcu_swap_protected(police->params,
	224	new,
	225	lockdep_is_held(&police->tcf_lock));
e9ce1cd3	226	spin_unlock_bh(&police->tcf_lock);
1da177e4	227
d6124d6b DC	228	if (goto_ch)
d6124d6b DC	229	tcf_chain_put_by_act(goto_ch);
2d550dba DC	230	if (new)
2d550dba DC	231	kfree_rcu(new, rcu);
1da177e4	232
2d550dba DC	233	if (ret == ACT_P_CREATED)
2d550dba DC	234	tcf_idr_insert(tn, *a);
1da177e4 LT	235	return ret;
	236
	237	failure:
3b69a4c9 YY	238	qdisc_put_rtab(P_tab);
3b69a4c9 YY	239	qdisc_put_rtab(R_tab);
d6124d6b DC	240	if (goto_ch)
	241	tcf_chain_put_by_act(goto_ch);
	242	release_idr:
4e8ddd7f	243	tcf_idr_release(*a, bind);
1da177e4 LT	244	return err;
	245	}
	246
2ac06347	247	static int tcf_police_act(struct sk_buff skb, const struct tc_action a,
10297b99	248	struct tcf_result *res)
1da177e4	249	{
a85a970a	250	struct tcf_police *police = to_police(a);
2d550dba	251	struct tcf_police_params *p;
93be42f9 DC	252	s64 now, toks, ptoks = 0;
93be42f9 DC	253	int ret;
1da177e4	254
3d3ed181	255	tcf_lastuse_update(&police->tcf_tm);
93be42f9	256	bstats_cpu_update(this_cpu_ptr(police->common.cpu_bstats), skb);
1da177e4	257
2d550dba DC	258	ret = READ_ONCE(police->tcf_action);
	259	p = rcu_dereference_bh(police->params);
	260
	261	if (p->tcfp_ewma_rate) {
1c0d32fd ED	262	struct gnet_stats_rate_est64 sample;
	263
	264	if (!gen_estimator_read(&police->tcf_rate_est, &sample) \|\|
2d550dba	265	sample.bps >= p->tcfp_ewma_rate)
93be42f9	266	goto inc_overlimits;
1da177e4	267	}
1da177e4	268
2d550dba DC	269	if (qdisc_pkt_len(skb) <= p->tcfp_mtu) {
	270	if (!p->rate_present) {
	271	ret = p->tcfp_result;
	272	goto end;
1da177e4 LT	273	}
1da177e4 LT	274
d2de875c	275	now = ktime_get_ns();
f2cbd485 DC	276	spin_lock_bh(&police->tcfp_lock);
f2cbd485 DC	277	toks = min_t(s64, now - police->tcfp_t_c, p->tcfp_burst);
2d550dba	278	if (p->peak_present) {
f2cbd485	279	ptoks = toks + police->tcfp_ptoks;
2d550dba DC	280	if (ptoks > p->tcfp_mtu_ptoks)
	281	ptoks = p->tcfp_mtu_ptoks;
	282	ptoks -= (s64)psched_l2t_ns(&p->peak,
	283	qdisc_pkt_len(skb));
1da177e4	284	}
f2cbd485	285	toks += police->tcfp_toks;
2d550dba DC	286	if (toks > p->tcfp_burst)
	287	toks = p->tcfp_burst;
	288	toks -= (s64)psched_l2t_ns(&p->rate, qdisc_pkt_len(skb));
1da177e4	289	if ((toks\|ptoks) >= 0) {
f2cbd485 DC	290	police->tcfp_t_c = now;
	291	police->tcfp_toks = toks;
	292	police->tcfp_ptoks = ptoks;
	293	spin_unlock_bh(&police->tcfp_lock);
2d550dba	294	ret = p->tcfp_result;
93be42f9	295	goto inc_drops;
1da177e4	296	}
f2cbd485	297	spin_unlock_bh(&police->tcfp_lock);
1da177e4	298	}
93be42f9 DC	299
	300	inc_overlimits:
	301	qstats_overlimit_inc(this_cpu_ptr(police->common.cpu_qstats));
	302	inc_drops:
	303	if (ret == TC_ACT_SHOT)
	304	qstats_drop_inc(this_cpu_ptr(police->common.cpu_qstats));
2d550dba	305	end:
93be42f9	306	return ret;
1da177e4 LT	307	}
1da177e4 LT	308
2d550dba DC	309	static void tcf_police_cleanup(struct tc_action *a)
	310	{
	311	struct tcf_police *police = to_police(a);
	312	struct tcf_police_params *p;
	313
	314	p = rcu_dereference_protected(police->params, 1);
	315	if (p)
	316	kfree_rcu(p, rcu);
	317	}
	318
2ac06347	319	static int tcf_police_dump(struct sk_buff skb, struct tc_action a,
5a7a5555	320	int bind, int ref)
1da177e4	321	{
27a884dc	322	unsigned char *b = skb_tail_pointer(skb);
a85a970a	323	struct tcf_police *police = to_police(a);
2d550dba	324	struct tcf_police_params *p;
0f04cfd0 JM	325	struct tc_police opt = {
0f04cfd0 JM	326	.index = police->tcf_index,
036bb443 VB	327	.refcnt = refcount_read(&police->tcf_refcnt) - ref,
036bb443 VB	328	.bindcnt = atomic_read(&police->tcf_bindcnt) - bind,
0f04cfd0	329	};
3d3ed181	330	struct tcf_t t;
0f04cfd0	331
e329bc42 VB	332	spin_lock_bh(&police->tcf_lock);
e329bc42 VB	333	opt.action = police->tcf_action;
2d550dba DC	334	p = rcu_dereference_protected(police->params,
	335	lockdep_is_held(&police->tcf_lock));
	336	opt.mtu = p->tcfp_mtu;
	337	opt.burst = PSCHED_NS2TICKS(p->tcfp_burst);
	338	if (p->rate_present)
	339	psched_ratecfg_getrate(&opt.rate, &p->rate);
	340	if (p->peak_present)
	341	psched_ratecfg_getrate(&opt.peakrate, &p->peak);
1b34ec43 DM	342	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
1b34ec43 DM	343	goto nla_put_failure;
2d550dba DC	344	if (p->tcfp_result &&
2d550dba DC	345	nla_put_u32(skb, TCA_POLICE_RESULT, p->tcfp_result))
1b34ec43	346	goto nla_put_failure;
2d550dba DC	347	if (p->tcfp_ewma_rate &&
2d550dba DC	348	nla_put_u32(skb, TCA_POLICE_AVRATE, p->tcfp_ewma_rate))
1b34ec43	349	goto nla_put_failure;
3d3ed181 JHS	350
	351	t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install);
	352	t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse);
53eb440f	353	t.firstuse = jiffies_to_clock_t(jiffies - police->tcf_tm.firstuse);
3d3ed181 JHS	354	t.expires = jiffies_to_clock_t(police->tcf_tm.expires);
	355	if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
	356	goto nla_put_failure;
e329bc42	357	spin_unlock_bh(&police->tcf_lock);
3d3ed181	358
1da177e4 LT	359	return skb->len;
1da177e4 LT	360
7ba699c6	361	nla_put_failure:
e329bc42	362	spin_unlock_bh(&police->tcf_lock);
dc5fc579	363	nlmsg_trim(skb, b);
1da177e4 LT	364	return -1;
	365	}
	366
f061b48c	367	static int tcf_police_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	368	{
	369	struct tc_action_net *tn = net_generic(net, police_net_id);
	370
65a206c0	371	return tcf_idr_search(tn, a, index);
ddf97ccd WC	372	}
ddf97ccd WC	373
1da177e4 LT	374	MODULE_AUTHOR("Alexey Kuznetsov");
	375	MODULE_DESCRIPTION("Policing actions");
	376	MODULE_LICENSE("GPL");
	377
	378	static struct tc_action_ops act_police_ops = {
	379	.kind = "police",
eddd2cf1	380	.id = TCA_ID_POLICE,
1da177e4	381	.owner = THIS_MODULE,
2ac06347 JHS	382	.act = tcf_police_act,
	383	.dump = tcf_police_dump,
	384	.init = tcf_police_init,
	385	.walk = tcf_police_walker,
ddf97ccd	386	.lookup = tcf_police_search,
2d550dba	387	.cleanup = tcf_police_cleanup,
a85a970a	388	.size = sizeof(struct tcf_police),
ddf97ccd WC	389	};
	390
	391	static __net_init int police_init_net(struct net *net)
	392	{
	393	struct tc_action_net *tn = net_generic(net, police_net_id);
	394
c7e460ce	395	return tc_action_net_init(tn, &act_police_ops);
ddf97ccd WC	396	}
ddf97ccd WC	397
039af9c6	398	static void __net_exit police_exit_net(struct list_head *net_list)
ddf97ccd	399	{
039af9c6	400	tc_action_net_exit(net_list, police_net_id);
ddf97ccd WC	401	}
	402
	403	static struct pernet_operations police_net_ops = {
	404	.init = police_init_net,
039af9c6	405	.exit_batch = police_exit_net,
ddf97ccd WC	406	.id = &police_net_id,
ddf97ccd WC	407	.size = sizeof(struct tc_action_net),
1da177e4 LT	408	};
1da177e4 LT	409
5a7a5555	410	static int __init police_init_module(void)
1da177e4	411	{
ddf97ccd	412	return tcf_register_action(&act_police_ops, &police_net_ops);
1da177e4 LT	413	}
1da177e4 LT	414
5a7a5555	415	static void __exit police_cleanup_module(void)
1da177e4	416	{
ddf97ccd	417	tcf_unregister_action(&act_police_ops, &police_net_ops);
1da177e4 LT	418	}
	419
	420	module_init(police_init_module);
	421	module_exit(police_cleanup_module);