[linux.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, <[email protected]>
 * 		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>

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 netlink_ext_ack *extack)
{
	int ret = 0, err;
	struct nlattr *tb[TCA_POLICE_MAX + 1];
	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;
	int size;

	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;
	}

	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;
	}

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

	/* No failure allowed after this point */
	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]);

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

	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);
	police->tcf_action = parm->action;
	rcu_swap_protected(police->params,
			   new,
			   lockdep_is_held(&police->tcf_lock));
	spin_unlock_bh(&police->tcf_lock);

	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);
	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",
	.type		=	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, <[email protected]>
	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>
1da177e4	24
2d550dba	25	struct tcf_police_params {
0e243218 JP	26	int tcfp_result;
0e243218 JP	27	u32 tcfp_ewma_rate;
c6d14ff1	28	s64 tcfp_burst;
0e243218	29	u32 tcfp_mtu;
c6d14ff1	30	s64 tcfp_mtu_ptoks;
c6d14ff1 JP	31	struct psched_ratecfg rate;
	32	bool rate_present;
	33	struct psched_ratecfg peak;
	34	bool peak_present;
2d550dba DC	35	struct rcu_head rcu;
	36	};
	37
	38	struct tcf_police {
	39	struct tc_action common;
	40	struct tcf_police_params __rcu *params;
f2cbd485 DC	41
	42	spinlock_t tcfp_lock ____cacheline_aligned_in_smp;
	43	s64 tcfp_toks;
	44	s64 tcfp_ptoks;
	45	s64 tcfp_t_c;
0e243218	46	};
a85a970a WC	47
a85a970a WC	48	#define to_police(pc) ((struct tcf_police *)pc)
0e243218	49
1e9b3d53	50	/* old policer structure from before tc actions */
cc7ec456	51	struct tc_police_compat {
1e9b3d53 PM	52	u32 index;
	53	int action;
	54	u32 limit;
	55	u32 burst;
	56	u32 mtu;
	57	struct tc_ratespec rate;
	58	struct tc_ratespec peakrate;
	59	};
	60
e9ce1cd3	61	/* Each policer is serialized by its individual spinlock */
1da177e4	62
c7d03a00	63	static unsigned int police_net_id;
a85a970a	64	static struct tc_action_ops act_police_ops;
ddf97ccd	65
2ac06347	66	static int tcf_police_walker(struct net net, struct sk_buff skb,
ddf97ccd	67	struct netlink_callback *cb, int type,
41780105 AA	68	const struct tc_action_ops *ops,
41780105 AA	69	struct netlink_ext_ack *extack)
1da177e4	70	{
ddf97ccd	71	struct tc_action_net *tn = net_generic(net, police_net_id);
1da177e4	72
b3620145	73	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
1da177e4	74	}
1da177e4	75
53b2bf3f PM	76	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	77	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	78	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	79	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	80	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	81	};
	82
2ac06347	83	static int tcf_police_init(struct net net, struct nlattr nla,
a85a970a	84	struct nlattr est, struct tc_action *a,
789871bb	85	int ovr, int bind, bool rtnl_held,
589dad6d	86	struct netlink_ext_ack *extack)
1da177e4	87	{
1da177e4	88	int ret = 0, err;
7ba699c6	89	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	90	struct tc_police *parm;
e9ce1cd3	91	struct tcf_police *police;
1da177e4	92	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
ddf97ccd	93	struct tc_action_net *tn = net_generic(net, police_net_id);
2d550dba	94	struct tcf_police_params *new;
0852e455	95	bool exists = false;
1e9b3d53	96	int size;
1da177e4	97
cee63723	98	if (nla == NULL)
1da177e4 LT	99	return -EINVAL;
1da177e4 LT	100
fceb6435	101	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy, NULL);
cee63723 PM	102	if (err < 0)
	103	return err;
	104
7ba699c6	105	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	106	return -EINVAL;
7ba699c6	107	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	108	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	109	return -EINVAL;
0852e455	110
7ba699c6	111	parm = nla_data(tb[TCA_POLICE_TBF]);
0190c1d4 VB	112	err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
	113	if (err < 0)
	114	return err;
	115	exists = err;
0852e455 WC	116	if (exists && bind)
0852e455 WC	117	return 0;
1da177e4	118
0852e455	119	if (!exists) {
65a206c0	120	ret = tcf_idr_create(tn, parm->index, NULL, a,
93be42f9	121	&act_police_ops, bind, true);
0190c1d4 VB	122	if (ret) {
0190c1d4 VB	123	tcf_idr_cleanup(tn, parm->index);
a03e6fe5	124	return ret;
0190c1d4	125	}
a03e6fe5	126	ret = ACT_P_CREATED;
484afd1b	127	spin_lock_init(&(to_police(*a)->tcfp_lock));
4e8ddd7f	128	} else if (!ovr) {
65a206c0	129	tcf_idr_release(*a, bind);
4e8ddd7f	130	return -EEXIST;
1da177e4 LT	131	}
1da177e4 LT	132
a85a970a	133	police = to_police(*a);
1da177e4 LT	134	if (parm->rate.rate) {
1da177e4 LT	135	err = -ENOMEM;
e9bc3fa2	136	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE], NULL);
1da177e4 LT	137	if (R_tab == NULL)
1da177e4 LT	138	goto failure;
c1b56878	139
1da177e4 LT	140	if (parm->peakrate.rate) {
1da177e4 LT	141	P_tab = qdisc_get_rtab(&parm->peakrate,
e9bc3fa2	142	tb[TCA_POLICE_PEAKRATE], NULL);
71bcb09a	143	if (P_tab == NULL)
1da177e4	144	goto failure;
1da177e4 LT	145	}
1da177e4 LT	146	}
71bcb09a	147
71bcb09a	148	if (est) {
93be42f9 DC	149	err = gen_replace_estimator(&police->tcf_bstats,
93be42f9 DC	150	police->common.cpu_bstats,
71bcb09a	151	&police->tcf_rate_est,
edb09eb1 ED	152	&police->tcf_lock,
edb09eb1 ED	153	NULL, est);
71bcb09a	154	if (err)
74030603	155	goto failure;
a883bf56 JP	156	} else if (tb[TCA_POLICE_AVRATE] &&
a883bf56 JP	157	(ret == ACT_P_CREATED \|\|
1c0d32fd	158	!gen_estimator_active(&police->tcf_rate_est))) {
a883bf56	159	err = -EINVAL;
74030603	160	goto failure;
71bcb09a SH	161	}
71bcb09a SH	162
2d550dba DC	163	new = kzalloc(sizeof(*new), GFP_KERNEL);
	164	if (unlikely(!new)) {
	165	err = -ENOMEM;
	166	goto failure;
	167	}
	168
71bcb09a	169	/* No failure allowed after this point */
2d550dba DC	170	new->tcfp_mtu = parm->mtu;
	171	if (!new->tcfp_mtu) {
	172	new->tcfp_mtu = ~0;
c6d14ff1	173	if (R_tab)
2d550dba	174	new->tcfp_mtu = 255 << R_tab->rate.cell_log;
c6d14ff1 JP	175	}
c6d14ff1 JP	176	if (R_tab) {
2d550dba DC	177	new->rate_present = true;
2d550dba DC	178	psched_ratecfg_precompute(&new->rate, &R_tab->rate, 0);
c6d14ff1 JP	179	qdisc_put_rtab(R_tab);
c6d14ff1 JP	180	} else {
2d550dba	181	new->rate_present = false;
1da177e4	182	}
c6d14ff1	183	if (P_tab) {
2d550dba DC	184	new->peak_present = true;
2d550dba DC	185	psched_ratecfg_precompute(&new->peak, &P_tab->rate, 0);
c6d14ff1 JP	186	qdisc_put_rtab(P_tab);
c6d14ff1 JP	187	} else {
2d550dba	188	new->peak_present = false;
1da177e4 LT	189	}
1da177e4 LT	190
2d550dba	191	new->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
f2cbd485	192	if (new->peak_present)
2d550dba DC	193	new->tcfp_mtu_ptoks = (s64)psched_l2t_ns(&new->peak,
2d550dba DC	194	new->tcfp_mtu);
1da177e4	195
7ba699c6	196	if (tb[TCA_POLICE_AVRATE])
2d550dba	197	new->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	198
c08f5ed5 DC	199	if (tb[TCA_POLICE_RESULT]) {
	200	new->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
	201	if (TC_ACT_EXT_CMP(new->tcfp_result, TC_ACT_GOTO_CHAIN)) {
	202	NL_SET_ERR_MSG(extack,
	203	"goto chain not allowed on fallback");
	204	err = -EINVAL;
	205	goto failure;
	206	}
	207	}
	208
2d550dba	209	spin_lock_bh(&police->tcf_lock);
f2cbd485 DC	210	spin_lock_bh(&police->tcfp_lock);
	211	police->tcfp_t_c = ktime_get_ns();
	212	police->tcfp_toks = new->tcfp_burst;
	213	if (new->peak_present)
	214	police->tcfp_ptoks = new->tcfp_mtu_ptoks;
	215	spin_unlock_bh(&police->tcfp_lock);
2d550dba DC	216	police->tcf_action = parm->action;
	217	rcu_swap_protected(police->params,
	218	new,
	219	lockdep_is_held(&police->tcf_lock));
e9ce1cd3	220	spin_unlock_bh(&police->tcf_lock);
1da177e4	221
2d550dba DC	222	if (new)
2d550dba DC	223	kfree_rcu(new, rcu);
1da177e4	224
2d550dba DC	225	if (ret == ACT_P_CREATED)
2d550dba DC	226	tcf_idr_insert(tn, *a);
1da177e4 LT	227	return ret;
	228
	229	failure:
3b69a4c9 YY	230	qdisc_put_rtab(P_tab);
3b69a4c9 YY	231	qdisc_put_rtab(R_tab);
4e8ddd7f	232	tcf_idr_release(*a, bind);
1da177e4 LT	233	return err;
	234	}
	235
2ac06347	236	static int tcf_police_act(struct sk_buff skb, const struct tc_action a,
10297b99	237	struct tcf_result *res)
1da177e4	238	{
a85a970a	239	struct tcf_police *police = to_police(a);
2d550dba	240	struct tcf_police_params *p;
93be42f9 DC	241	s64 now, toks, ptoks = 0;
93be42f9 DC	242	int ret;
1da177e4	243
3d3ed181	244	tcf_lastuse_update(&police->tcf_tm);
93be42f9	245	bstats_cpu_update(this_cpu_ptr(police->common.cpu_bstats), skb);
1da177e4	246
2d550dba DC	247	ret = READ_ONCE(police->tcf_action);
	248	p = rcu_dereference_bh(police->params);
	249
	250	if (p->tcfp_ewma_rate) {
1c0d32fd ED	251	struct gnet_stats_rate_est64 sample;
	252
	253	if (!gen_estimator_read(&police->tcf_rate_est, &sample) \|\|
2d550dba	254	sample.bps >= p->tcfp_ewma_rate)
93be42f9	255	goto inc_overlimits;
1da177e4	256	}
1da177e4	257
2d550dba DC	258	if (qdisc_pkt_len(skb) <= p->tcfp_mtu) {
	259	if (!p->rate_present) {
	260	ret = p->tcfp_result;
	261	goto end;
1da177e4 LT	262	}
1da177e4 LT	263
d2de875c	264	now = ktime_get_ns();
f2cbd485 DC	265	spin_lock_bh(&police->tcfp_lock);
f2cbd485 DC	266	toks = min_t(s64, now - police->tcfp_t_c, p->tcfp_burst);
2d550dba	267	if (p->peak_present) {
f2cbd485	268	ptoks = toks + police->tcfp_ptoks;
2d550dba DC	269	if (ptoks > p->tcfp_mtu_ptoks)
	270	ptoks = p->tcfp_mtu_ptoks;
	271	ptoks -= (s64)psched_l2t_ns(&p->peak,
	272	qdisc_pkt_len(skb));
1da177e4	273	}
f2cbd485	274	toks += police->tcfp_toks;
2d550dba DC	275	if (toks > p->tcfp_burst)
	276	toks = p->tcfp_burst;
	277	toks -= (s64)psched_l2t_ns(&p->rate, qdisc_pkt_len(skb));
1da177e4	278	if ((toks\|ptoks) >= 0) {
f2cbd485 DC	279	police->tcfp_t_c = now;
	280	police->tcfp_toks = toks;
	281	police->tcfp_ptoks = ptoks;
	282	spin_unlock_bh(&police->tcfp_lock);
2d550dba	283	ret = p->tcfp_result;
93be42f9	284	goto inc_drops;
1da177e4	285	}
f2cbd485	286	spin_unlock_bh(&police->tcfp_lock);
1da177e4	287	}
93be42f9 DC	288
	289	inc_overlimits:
	290	qstats_overlimit_inc(this_cpu_ptr(police->common.cpu_qstats));
	291	inc_drops:
	292	if (ret == TC_ACT_SHOT)
	293	qstats_drop_inc(this_cpu_ptr(police->common.cpu_qstats));
2d550dba	294	end:
93be42f9	295	return ret;
1da177e4 LT	296	}
1da177e4 LT	297
2d550dba DC	298	static void tcf_police_cleanup(struct tc_action *a)
	299	{
	300	struct tcf_police *police = to_police(a);
	301	struct tcf_police_params *p;
	302
	303	p = rcu_dereference_protected(police->params, 1);
	304	if (p)
	305	kfree_rcu(p, rcu);
	306	}
	307
2ac06347	308	static int tcf_police_dump(struct sk_buff skb, struct tc_action a,
5a7a5555	309	int bind, int ref)
1da177e4	310	{
27a884dc	311	unsigned char *b = skb_tail_pointer(skb);
a85a970a	312	struct tcf_police *police = to_police(a);
2d550dba	313	struct tcf_police_params *p;
0f04cfd0 JM	314	struct tc_police opt = {
0f04cfd0 JM	315	.index = police->tcf_index,
036bb443 VB	316	.refcnt = refcount_read(&police->tcf_refcnt) - ref,
036bb443 VB	317	.bindcnt = atomic_read(&police->tcf_bindcnt) - bind,
0f04cfd0	318	};
3d3ed181	319	struct tcf_t t;
0f04cfd0	320
e329bc42 VB	321	spin_lock_bh(&police->tcf_lock);
e329bc42 VB	322	opt.action = police->tcf_action;
2d550dba DC	323	p = rcu_dereference_protected(police->params,
	324	lockdep_is_held(&police->tcf_lock));
	325	opt.mtu = p->tcfp_mtu;
	326	opt.burst = PSCHED_NS2TICKS(p->tcfp_burst);
	327	if (p->rate_present)
	328	psched_ratecfg_getrate(&opt.rate, &p->rate);
	329	if (p->peak_present)
	330	psched_ratecfg_getrate(&opt.peakrate, &p->peak);
1b34ec43 DM	331	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
1b34ec43 DM	332	goto nla_put_failure;
2d550dba DC	333	if (p->tcfp_result &&
2d550dba DC	334	nla_put_u32(skb, TCA_POLICE_RESULT, p->tcfp_result))
1b34ec43	335	goto nla_put_failure;
2d550dba DC	336	if (p->tcfp_ewma_rate &&
2d550dba DC	337	nla_put_u32(skb, TCA_POLICE_AVRATE, p->tcfp_ewma_rate))
1b34ec43	338	goto nla_put_failure;
3d3ed181 JHS	339
	340	t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install);
	341	t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse);
53eb440f	342	t.firstuse = jiffies_to_clock_t(jiffies - police->tcf_tm.firstuse);
3d3ed181 JHS	343	t.expires = jiffies_to_clock_t(police->tcf_tm.expires);
	344	if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
	345	goto nla_put_failure;
e329bc42	346	spin_unlock_bh(&police->tcf_lock);
3d3ed181	347
1da177e4 LT	348	return skb->len;
1da177e4 LT	349
7ba699c6	350	nla_put_failure:
e329bc42	351	spin_unlock_bh(&police->tcf_lock);
dc5fc579	352	nlmsg_trim(skb, b);
1da177e4 LT	353	return -1;
	354	}
	355
f061b48c	356	static int tcf_police_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	357	{
	358	struct tc_action_net *tn = net_generic(net, police_net_id);
	359
65a206c0	360	return tcf_idr_search(tn, a, index);
ddf97ccd WC	361	}
ddf97ccd WC	362
1da177e4 LT	363	MODULE_AUTHOR("Alexey Kuznetsov");
	364	MODULE_DESCRIPTION("Policing actions");
	365	MODULE_LICENSE("GPL");
	366
	367	static struct tc_action_ops act_police_ops = {
	368	.kind = "police",
	369	.type = TCA_ID_POLICE,
1da177e4	370	.owner = THIS_MODULE,
2ac06347 JHS	371	.act = tcf_police_act,
	372	.dump = tcf_police_dump,
	373	.init = tcf_police_init,
	374	.walk = tcf_police_walker,
ddf97ccd	375	.lookup = tcf_police_search,
2d550dba	376	.cleanup = tcf_police_cleanup,
a85a970a	377	.size = sizeof(struct tcf_police),
ddf97ccd WC	378	};
	379
	380	static __net_init int police_init_net(struct net *net)
	381	{
	382	struct tc_action_net *tn = net_generic(net, police_net_id);
	383
c7e460ce	384	return tc_action_net_init(tn, &act_police_ops);
ddf97ccd WC	385	}
ddf97ccd WC	386
039af9c6	387	static void __net_exit police_exit_net(struct list_head *net_list)
ddf97ccd	388	{
039af9c6	389	tc_action_net_exit(net_list, police_net_id);
ddf97ccd WC	390	}
	391
	392	static struct pernet_operations police_net_ops = {
	393	.init = police_init_net,
039af9c6	394	.exit_batch = police_exit_net,
ddf97ccd WC	395	.id = &police_net_id,
ddf97ccd WC	396	.size = sizeof(struct tc_action_net),
1da177e4 LT	397	};
1da177e4 LT	398
5a7a5555	399	static int __init police_init_module(void)
1da177e4	400	{
ddf97ccd	401	return tcf_register_action(&act_police_ops, &police_net_ops);
1da177e4 LT	402	}
1da177e4 LT	403
5a7a5555	404	static void __exit police_cleanup_module(void)
1da177e4	405	{
ddf97ccd	406	tcf_unregister_action(&act_police_ops, &police_net_ops);
1da177e4 LT	407	}
	408
	409	module_init(police_init_module);
	410	module_exit(police_cleanup_module);