[mirror_ubuntu-hirsute-kernel.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>

struct tcf_police {
	struct tc_action	common;
	int			tcfp_result;
	u32			tcfp_ewma_rate;
	s64			tcfp_burst;
	u32			tcfp_mtu;
	s64			tcfp_toks;
	s64			tcfp_ptoks;
	s64			tcfp_mtu_ptoks;
	s64			tcfp_t_c;
	struct psched_ratecfg	rate;
	bool			rate_present;
	struct psched_ratecfg	peak;
	bool			peak_present;
};

#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_act_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_act_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);
	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, false);
		if (ret) {
			tcf_idr_cleanup(tn, parm->index);
			return ret;
		}
		ret = ACT_P_CREATED;
	} 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, NULL,
					    &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;
	}

	spin_lock_bh(&police->tcf_lock);
	/* No failure allowed after this point */
	police->tcfp_mtu = parm->mtu;
	if (police->tcfp_mtu == 0) {
		police->tcfp_mtu = ~0;
		if (R_tab)
			police->tcfp_mtu = 255 << R_tab->rate.cell_log;
	}
	if (R_tab) {
		police->rate_present = true;
		psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0);
		qdisc_put_rtab(R_tab);
	} else {
		police->rate_present = false;
	}
	if (P_tab) {
		police->peak_present = true;
		psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0);
		qdisc_put_rtab(P_tab);
	} else {
		police->peak_present = false;
	}

	if (tb[TCA_POLICE_RESULT])
		police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
	police->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
	police->tcfp_toks = police->tcfp_burst;
	if (police->peak_present) {
		police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak,
							     police->tcfp_mtu);
		police->tcfp_ptoks = police->tcfp_mtu_ptoks;
	}
	police->tcf_action = parm->action;

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

	spin_unlock_bh(&police->tcf_lock);
	if (ret != ACT_P_CREATED)
		return ret;

	police->tcfp_t_c = ktime_get_ns();
	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_act_police(struct sk_buff *skb, const struct tc_action *a,
			  struct tcf_result *res)
{
	struct tcf_police *police = to_police(a);
	s64 now;
	s64 toks;
	s64 ptoks = 0;

	spin_lock(&police->tcf_lock);

	bstats_update(&police->tcf_bstats, skb);
	tcf_lastuse_update(&police->tcf_tm);

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

		if (!gen_estimator_read(&police->tcf_rate_est, &sample) ||
		    sample.bps >= police->tcfp_ewma_rate) {
			police->tcf_qstats.overlimits++;
			if (police->tcf_action == TC_ACT_SHOT)
				police->tcf_qstats.drops++;
			spin_unlock(&police->tcf_lock);
			return police->tcf_action;
		}
	}

	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
		if (!police->rate_present) {
			spin_unlock(&police->tcf_lock);
			return police->tcfp_result;
		}

		now = ktime_get_ns();
		toks = min_t(s64, now - police->tcfp_t_c,
			     police->tcfp_burst);
		if (police->peak_present) {
			ptoks = toks + police->tcfp_ptoks;
			if (ptoks > police->tcfp_mtu_ptoks)
				ptoks = police->tcfp_mtu_ptoks;
			ptoks -= (s64) psched_l2t_ns(&police->peak,
						     qdisc_pkt_len(skb));
		}
		toks += police->tcfp_toks;
		if (toks > police->tcfp_burst)
			toks = police->tcfp_burst;
		toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb));
		if ((toks|ptoks) >= 0) {
			police->tcfp_t_c = now;
			police->tcfp_toks = toks;
			police->tcfp_ptoks = ptoks;
			if (police->tcfp_result == TC_ACT_SHOT)
				police->tcf_qstats.drops++;
			spin_unlock(&police->tcf_lock);
			return police->tcfp_result;
		}
	}

	police->tcf_qstats.overlimits++;
	if (police->tcf_action == TC_ACT_SHOT)
		police->tcf_qstats.drops++;
	spin_unlock(&police->tcf_lock);
	return police->tcf_action;
}

static int tcf_act_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 tc_police opt = {
		.index = police->tcf_index,
		.action = police->tcf_action,
		.mtu = police->tcfp_mtu,
		.burst = PSCHED_NS2TICKS(police->tcfp_burst),
		.refcnt = refcount_read(&police->tcf_refcnt) - ref,
		.bindcnt = atomic_read(&police->tcf_bindcnt) - bind,
	};
	struct tcf_t t;

	if (police->rate_present)
		psched_ratecfg_getrate(&opt.rate, &police->rate);
	if (police->peak_present)
		psched_ratecfg_getrate(&opt.peakrate, &police->peak);
	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
		goto nla_put_failure;
	if (police->tcfp_result &&
	    nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
		goto nla_put_failure;
	if (police->tcfp_ewma_rate &&
	    nla_put_u32(skb, TCA_POLICE_AVRATE, police->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;

	return skb->len;

nla_put_failure:
	nlmsg_trim(skb, b);
	return -1;
}

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

	return tcf_idr_search(tn, a, index);
}

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

	return tcf_idr_delete_index(tn, 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_act_police,
	.dump		=	tcf_act_police_dump,
	.init		=	tcf_act_police_init,
	.walk		=	tcf_act_police_walker,
	.lookup		=	tcf_police_search,
	.delete		=	tcf_police_delete,
	.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>
1da177e4	24
0e243218	25	struct tcf_police {
ec0595cc	26	struct tc_action common;
0e243218 JP	27	int tcfp_result;
0e243218 JP	28	u32 tcfp_ewma_rate;
c6d14ff1	29	s64 tcfp_burst;
0e243218	30	u32 tcfp_mtu;
c6d14ff1 JP	31	s64 tcfp_toks;
	32	s64 tcfp_ptoks;
	33	s64 tcfp_mtu_ptoks;
	34	s64 tcfp_t_c;
	35	struct psched_ratecfg rate;
	36	bool rate_present;
	37	struct psched_ratecfg peak;
	38	bool peak_present;
0e243218	39	};
a85a970a WC	40
a85a970a WC	41	#define to_police(pc) ((struct tcf_police *)pc)
0e243218	42
1e9b3d53	43	/* old policer structure from before tc actions */
cc7ec456	44	struct tc_police_compat {
1e9b3d53 PM	45	u32 index;
	46	int action;
	47	u32 limit;
	48	u32 burst;
	49	u32 mtu;
	50	struct tc_ratespec rate;
	51	struct tc_ratespec peakrate;
	52	};
	53
e9ce1cd3	54	/* Each policer is serialized by its individual spinlock */
1da177e4	55
c7d03a00	56	static unsigned int police_net_id;
a85a970a	57	static struct tc_action_ops act_police_ops;
ddf97ccd WC	58
	59	static int tcf_act_police_walker(struct net net, struct sk_buff skb,
	60	struct netlink_callback *cb, int type,
41780105 AA	61	const struct tc_action_ops *ops,
41780105 AA	62	struct netlink_ext_ack *extack)
1da177e4	63	{
ddf97ccd	64	struct tc_action_net *tn = net_generic(net, police_net_id);
1da177e4	65
b3620145	66	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
1da177e4	67	}
1da177e4	68
53b2bf3f PM	69	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	70	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	71	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	72	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	73	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	74	};
	75
d9fa17ef	76	static int tcf_act_police_init(struct net net, struct nlattr nla,
a85a970a	77	struct nlattr est, struct tc_action *a,
789871bb	78	int ovr, int bind, bool rtnl_held,
589dad6d	79	struct netlink_ext_ack *extack)
1da177e4	80	{
1da177e4	81	int ret = 0, err;
7ba699c6	82	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	83	struct tc_police *parm;
e9ce1cd3	84	struct tcf_police *police;
1da177e4	85	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
ddf97ccd	86	struct tc_action_net *tn = net_generic(net, police_net_id);
0852e455	87	bool exists = false;
1e9b3d53	88	int size;
1da177e4	89
cee63723	90	if (nla == NULL)
1da177e4 LT	91	return -EINVAL;
1da177e4 LT	92
fceb6435	93	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy, NULL);
cee63723 PM	94	if (err < 0)
	95	return err;
	96
7ba699c6	97	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	98	return -EINVAL;
7ba699c6	99	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	100	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	101	return -EINVAL;
0852e455	102
7ba699c6	103	parm = nla_data(tb[TCA_POLICE_TBF]);
0190c1d4 VB	104	err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
	105	if (err < 0)
	106	return err;
	107	exists = err;
0852e455 WC	108	if (exists && bind)
0852e455 WC	109	return 0;
1da177e4	110
0852e455	111	if (!exists) {
65a206c0 CM	112	ret = tcf_idr_create(tn, parm->index, NULL, a,
65a206c0 CM	113	&act_police_ops, bind, false);
0190c1d4 VB	114	if (ret) {
0190c1d4 VB	115	tcf_idr_cleanup(tn, parm->index);
a03e6fe5	116	return ret;
0190c1d4	117	}
a03e6fe5	118	ret = ACT_P_CREATED;
4e8ddd7f	119	} else if (!ovr) {
65a206c0	120	tcf_idr_release(*a, bind);
4e8ddd7f	121	return -EEXIST;
1da177e4 LT	122	}
1da177e4 LT	123
a85a970a	124	police = to_police(*a);
1da177e4 LT	125	if (parm->rate.rate) {
1da177e4 LT	126	err = -ENOMEM;
e9bc3fa2	127	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE], NULL);
1da177e4 LT	128	if (R_tab == NULL)
1da177e4 LT	129	goto failure;
c1b56878	130
1da177e4 LT	131	if (parm->peakrate.rate) {
1da177e4 LT	132	P_tab = qdisc_get_rtab(&parm->peakrate,
e9bc3fa2	133	tb[TCA_POLICE_PEAKRATE], NULL);
71bcb09a	134	if (P_tab == NULL)
1da177e4	135	goto failure;
1da177e4 LT	136	}
1da177e4 LT	137	}
71bcb09a	138
71bcb09a	139	if (est) {
22e0f8b9	140	err = gen_replace_estimator(&police->tcf_bstats, NULL,
71bcb09a	141	&police->tcf_rate_est,
edb09eb1 ED	142	&police->tcf_lock,
edb09eb1 ED	143	NULL, est);
71bcb09a	144	if (err)
74030603	145	goto failure;
a883bf56 JP	146	} else if (tb[TCA_POLICE_AVRATE] &&
a883bf56 JP	147	(ret == ACT_P_CREATED \|\|
1c0d32fd	148	!gen_estimator_active(&police->tcf_rate_est))) {
a883bf56	149	err = -EINVAL;
74030603	150	goto failure;
71bcb09a SH	151	}
71bcb09a SH	152
74030603	153	spin_lock_bh(&police->tcf_lock);
71bcb09a	154	/* No failure allowed after this point */
c6d14ff1 JP	155	police->tcfp_mtu = parm->mtu;
	156	if (police->tcfp_mtu == 0) {
	157	police->tcfp_mtu = ~0;
	158	if (R_tab)
	159	police->tcfp_mtu = 255 << R_tab->rate.cell_log;
	160	}
	161	if (R_tab) {
	162	police->rate_present = true;
3e1e3aae	163	psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0);
c6d14ff1 JP	164	qdisc_put_rtab(R_tab);
	165	} else {
	166	police->rate_present = false;
1da177e4	167	}
c6d14ff1 JP	168	if (P_tab) {
c6d14ff1 JP	169	police->peak_present = true;
3e1e3aae	170	psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0);
c6d14ff1 JP	171	qdisc_put_rtab(P_tab);
	172	} else {
	173	police->peak_present = false;
1da177e4 LT	174	}
1da177e4 LT	175
7ba699c6	176	if (tb[TCA_POLICE_RESULT])
1587bac4	177	police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
c6d14ff1 JP	178	police->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
	179	police->tcfp_toks = police->tcfp_burst;
	180	if (police->peak_present) {
	181	police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak,
	182	police->tcfp_mtu);
	183	police->tcfp_ptoks = police->tcfp_mtu_ptoks;
1da177e4	184	}
e9ce1cd3	185	police->tcf_action = parm->action;
1da177e4	186
7ba699c6	187	if (tb[TCA_POLICE_AVRATE])
1587bac4	188	police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	189
e9ce1cd3	190	spin_unlock_bh(&police->tcf_lock);
1da177e4 LT	191	if (ret != ACT_P_CREATED)
	192	return ret;
	193
d2de875c	194	police->tcfp_t_c = ktime_get_ns();
65a206c0	195	tcf_idr_insert(tn, *a);
1da177e4	196
1da177e4 LT	197	return ret;
	198
	199	failure:
3b69a4c9 YY	200	qdisc_put_rtab(P_tab);
3b69a4c9 YY	201	qdisc_put_rtab(R_tab);
4e8ddd7f	202	tcf_idr_release(*a, bind);
1da177e4 LT	203	return err;
	204	}
	205
dc7f9f6e	206	static int tcf_act_police(struct sk_buff skb, const struct tc_action a,
10297b99	207	struct tcf_result *res)
1da177e4	208	{
a85a970a	209	struct tcf_police *police = to_police(a);
c6d14ff1 JP	210	s64 now;
	211	s64 toks;
	212	s64 ptoks = 0;
1da177e4	213
e9ce1cd3	214	spin_lock(&police->tcf_lock);
1da177e4	215
bfe0d029	216	bstats_update(&police->tcf_bstats, skb);
3d3ed181	217	tcf_lastuse_update(&police->tcf_tm);
1da177e4	218
1c0d32fd ED	219	if (police->tcfp_ewma_rate) {
	220	struct gnet_stats_rate_est64 sample;
	221
	222	if (!gen_estimator_read(&police->tcf_rate_est, &sample) \|\|
	223	sample.bps >= police->tcfp_ewma_rate) {
	224	police->tcf_qstats.overlimits++;
	225	if (police->tcf_action == TC_ACT_SHOT)
	226	police->tcf_qstats.drops++;
	227	spin_unlock(&police->tcf_lock);
	228	return police->tcf_action;
	229	}
1da177e4	230	}
1da177e4	231
0abf77e5	232	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
c6d14ff1	233	if (!police->rate_present) {
e9ce1cd3 DM	234	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	235	return police->tcfp_result;
1da177e4 LT	236	}
1da177e4 LT	237
d2de875c	238	now = ktime_get_ns();
c6d14ff1 JP	239	toks = min_t(s64, now - police->tcfp_t_c,
	240	police->tcfp_burst);
	241	if (police->peak_present) {
e9ce1cd3	242	ptoks = toks + police->tcfp_ptoks;
c6d14ff1 JP	243	if (ptoks > police->tcfp_mtu_ptoks)
	244	ptoks = police->tcfp_mtu_ptoks;
	245	ptoks -= (s64) psched_l2t_ns(&police->peak,
	246	qdisc_pkt_len(skb));
1da177e4	247	}
e9ce1cd3	248	toks += police->tcfp_toks;
c6d14ff1	249	if (toks > police->tcfp_burst)
e9ce1cd3	250	toks = police->tcfp_burst;
c6d14ff1	251	toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb));
1da177e4	252	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	253	police->tcfp_t_c = now;
	254	police->tcfp_toks = toks;
	255	police->tcfp_ptoks = ptoks;
f71b109f RM	256	if (police->tcfp_result == TC_ACT_SHOT)
f71b109f RM	257	police->tcf_qstats.drops++;
e9ce1cd3 DM	258	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	259	return police->tcfp_result;
1da177e4 LT	260	}
	261	}
	262
e9ce1cd3	263	police->tcf_qstats.overlimits++;
b9647580 JP	264	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	265	police->tcf_qstats.drops++;
e9ce1cd3 DM	266	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	267	return police->tcf_action;
1da177e4 LT	268	}
1da177e4 LT	269
5a7a5555 JHS	270	static int tcf_act_police_dump(struct sk_buff skb, struct tc_action a,
5a7a5555 JHS	271	int bind, int ref)
1da177e4	272	{
27a884dc	273	unsigned char *b = skb_tail_pointer(skb);
a85a970a	274	struct tcf_police *police = to_police(a);
0f04cfd0 JM	275	struct tc_police opt = {
	276	.index = police->tcf_index,
	277	.action = police->tcf_action,
	278	.mtu = police->tcfp_mtu,
c6d14ff1	279	.burst = PSCHED_NS2TICKS(police->tcfp_burst),
036bb443 VB	280	.refcnt = refcount_read(&police->tcf_refcnt) - ref,
036bb443 VB	281	.bindcnt = atomic_read(&police->tcf_bindcnt) - bind,
0f04cfd0	282	};
3d3ed181	283	struct tcf_t t;
0f04cfd0	284
c6d14ff1	285	if (police->rate_present)
01cb71d2	286	psched_ratecfg_getrate(&opt.rate, &police->rate);
c6d14ff1	287	if (police->peak_present)
01cb71d2	288	psched_ratecfg_getrate(&opt.peakrate, &police->peak);
1b34ec43 DM	289	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
	290	goto nla_put_failure;
	291	if (police->tcfp_result &&
	292	nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
	293	goto nla_put_failure;
	294	if (police->tcfp_ewma_rate &&
	295	nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
	296	goto nla_put_failure;
3d3ed181 JHS	297
	298	t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install);
	299	t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse);
53eb440f	300	t.firstuse = jiffies_to_clock_t(jiffies - police->tcf_tm.firstuse);
3d3ed181 JHS	301	t.expires = jiffies_to_clock_t(police->tcf_tm.expires);
	302	if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
	303	goto nla_put_failure;
	304
1da177e4 LT	305	return skb->len;
1da177e4 LT	306
7ba699c6	307	nla_put_failure:
dc5fc579	308	nlmsg_trim(skb, b);
1da177e4 LT	309	return -1;
	310	}
	311
331a9295 AA	312	static int tcf_police_search(struct net net, struct tc_action *a, u32 index,
331a9295 AA	313	struct netlink_ext_ack *extack)
ddf97ccd WC	314	{
	315	struct tc_action_net *tn = net_generic(net, police_net_id);
	316
65a206c0	317	return tcf_idr_search(tn, a, index);
ddf97ccd WC	318	}
ddf97ccd WC	319
b409074e VB	320	static int tcf_police_delete(struct net *net, u32 index)
	321	{
	322	struct tc_action_net *tn = net_generic(net, police_net_id);
	323
	324	return tcf_idr_delete_index(tn, index);
	325	}
	326
1da177e4 LT	327	MODULE_AUTHOR("Alexey Kuznetsov");
	328	MODULE_DESCRIPTION("Policing actions");
	329	MODULE_LICENSE("GPL");
	330
	331	static struct tc_action_ops act_police_ops = {
	332	.kind = "police",
	333	.type = TCA_ID_POLICE,
1da177e4 LT	334	.owner = THIS_MODULE,
	335	.act = tcf_act_police,
	336	.dump = tcf_act_police_dump,
d9fa17ef	337	.init = tcf_act_police_init,
ddf97ccd WC	338	.walk = tcf_act_police_walker,
ddf97ccd WC	339	.lookup = tcf_police_search,
b409074e	340	.delete = tcf_police_delete,
a85a970a	341	.size = sizeof(struct tcf_police),
ddf97ccd WC	342	};
	343
	344	static __net_init int police_init_net(struct net *net)
	345	{
	346	struct tc_action_net *tn = net_generic(net, police_net_id);
	347
c7e460ce	348	return tc_action_net_init(tn, &act_police_ops);
ddf97ccd WC	349	}
ddf97ccd WC	350
039af9c6	351	static void __net_exit police_exit_net(struct list_head *net_list)
ddf97ccd	352	{
039af9c6	353	tc_action_net_exit(net_list, police_net_id);
ddf97ccd WC	354	}
	355
	356	static struct pernet_operations police_net_ops = {
	357	.init = police_init_net,
039af9c6	358	.exit_batch = police_exit_net,
ddf97ccd WC	359	.id = &police_net_id,
ddf97ccd WC	360	.size = sizeof(struct tc_action_net),
1da177e4 LT	361	};
1da177e4 LT	362
5a7a5555	363	static int __init police_init_module(void)
1da177e4	364	{
ddf97ccd	365	return tcf_register_action(&act_police_ops, &police_net_ops);
1da177e4 LT	366	}
1da177e4 LT	367
5a7a5555	368	static void __exit police_cleanup_module(void)
1da177e4	369	{
ddf97ccd	370	tcf_unregister_action(&act_police_ops, &police_net_ops);
1da177e4 LT	371	}
	372
	373	module_init(police_init_module);
	374	module_exit(police_cleanup_module);