[mirror_ubuntu-zesty-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)

#define POL_TAB_MASK     15

/* 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 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 tc_action_net *tn = net_generic(net, police_net_id);

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

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)
{
	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);
	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]);
	exists = tcf_hash_check(tn, parm->index, a, bind);
	if (exists && bind)
		return 0;

	if (!exists) {
		ret = tcf_hash_create(tn, parm->index, NULL, a,
				      &act_police_ops, bind, false);
		if (ret)
			return ret;
		ret = ACT_P_CREATED;
	} else {
		tcf_hash_release(*a, bind);
		if (!ovr)
			return -EEXIST;
	}

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

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

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

	/* 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_hash_insert(tn, *a);

	return ret;

failure_unlock:
	spin_unlock_bh(&police->tcf_lock);
failure:
	qdisc_put_rtab(P_tab);
	qdisc_put_rtab(R_tab);
	if (ret == ACT_P_CREATED)
		tcf_hash_cleanup(*a, est);
	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 &&
	    police->tcf_rate_est.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;
			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 = police->tcf_refcnt - ref,
		.bindcnt = 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 tc_action_net *tn = net_generic(net, police_net_id);

	return tcf_hash_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_act_police,
	.dump		=	tcf_act_police_dump,
	.init		=	tcf_act_police_init,
	.walk		=	tcf_act_police_walker,
	.lookup		=	tcf_police_search,
	.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, POL_TAB_MASK);
}

static void __net_exit police_exit_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, police_net_id);

	tc_action_net_exit(tn);
}

static struct pernet_operations police_net_ops = {
	.init = police_init_net,
	.exit = 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
e9ce1cd3	43	#define POL_TAB_MASK 15
1da177e4	44
1e9b3d53	45	/* old policer structure from before tc actions */
cc7ec456	46	struct tc_police_compat {
1e9b3d53 PM	47	u32 index;
	48	int action;
	49	u32 limit;
	50	u32 burst;
	51	u32 mtu;
	52	struct tc_ratespec rate;
	53	struct tc_ratespec peakrate;
	54	};
	55
e9ce1cd3	56	/* Each policer is serialized by its individual spinlock */
1da177e4	57
ddf97ccd	58	static int police_net_id;
a85a970a	59	static struct tc_action_ops act_police_ops;
ddf97ccd WC	60
	61	static int tcf_act_police_walker(struct net net, struct sk_buff skb,
	62	struct netlink_callback *cb, int type,
a85a970a	63	const struct tc_action_ops *ops)
1da177e4	64	{
ddf97ccd	65	struct tc_action_net *tn = net_generic(net, police_net_id);
1da177e4	66
b5ac8518	67	return tcf_generic_walker(tn, skb, cb, type, ops);
1da177e4	68	}
1da177e4	69
53b2bf3f PM	70	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	71	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	72	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	73	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	74	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	75	};
	76
d9fa17ef	77	static int tcf_act_police_init(struct net net, struct nlattr nla,
a85a970a	78	struct nlattr est, struct tc_action *a,
d9fa17ef	79	int ovr, int bind)
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
53b2bf3f	93	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
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]);
0852e455 WC	104	exists = tcf_hash_check(tn, parm->index, a, bind);
	105	if (exists && bind)
	106	return 0;
1da177e4	107
0852e455	108	if (!exists) {
a03e6fe5	109	ret = tcf_hash_create(tn, parm->index, NULL, a,
a85a970a	110	&act_police_ops, bind, false);
a03e6fe5 WC	111	if (ret)
	112	return ret;
	113	ret = ACT_P_CREATED;
0852e455 WC	114	} else {
	115	tcf_hash_release(*a, bind);
	116	if (!ovr)
	117	return -EEXIST;
1da177e4 LT	118	}
1da177e4 LT	119
a85a970a	120	police = to_police(*a);
1da177e4 LT	121	if (parm->rate.rate) {
1da177e4 LT	122	err = -ENOMEM;
7ba699c6	123	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
1da177e4 LT	124	if (R_tab == NULL)
1da177e4 LT	125	goto failure;
c1b56878	126
1da177e4 LT	127	if (parm->peakrate.rate) {
1da177e4 LT	128	P_tab = qdisc_get_rtab(&parm->peakrate,
7ba699c6	129	tb[TCA_POLICE_PEAKRATE]);
71bcb09a	130	if (P_tab == NULL)
1da177e4	131	goto failure;
1da177e4 LT	132	}
1da177e4 LT	133	}
71bcb09a	134
e9ce1cd3	135	spin_lock_bh(&police->tcf_lock);
71bcb09a	136	if (est) {
22e0f8b9	137	err = gen_replace_estimator(&police->tcf_bstats, NULL,
71bcb09a	138	&police->tcf_rate_est,
edb09eb1 ED	139	&police->tcf_lock,
edb09eb1 ED	140	NULL, est);
71bcb09a SH	141	if (err)
71bcb09a SH	142	goto failure_unlock;
a883bf56 JP	143	} else if (tb[TCA_POLICE_AVRATE] &&
	144	(ret == ACT_P_CREATED \|\|
	145	!gen_estimator_active(&police->tcf_bstats,
	146	&police->tcf_rate_est))) {
	147	err = -EINVAL;
	148	goto failure_unlock;
71bcb09a SH	149	}
	150
	151	/* No failure allowed after this point */
c6d14ff1 JP	152	police->tcfp_mtu = parm->mtu;
	153	if (police->tcfp_mtu == 0) {
	154	police->tcfp_mtu = ~0;
	155	if (R_tab)
	156	police->tcfp_mtu = 255 << R_tab->rate.cell_log;
	157	}
	158	if (R_tab) {
	159	police->rate_present = true;
3e1e3aae	160	psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0);
c6d14ff1 JP	161	qdisc_put_rtab(R_tab);
	162	} else {
	163	police->rate_present = false;
1da177e4	164	}
c6d14ff1 JP	165	if (P_tab) {
c6d14ff1 JP	166	police->peak_present = true;
3e1e3aae	167	psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0);
c6d14ff1 JP	168	qdisc_put_rtab(P_tab);
	169	} else {
	170	police->peak_present = false;
1da177e4 LT	171	}
1da177e4 LT	172
7ba699c6	173	if (tb[TCA_POLICE_RESULT])
1587bac4	174	police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
c6d14ff1 JP	175	police->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
	176	police->tcfp_toks = police->tcfp_burst;
	177	if (police->peak_present) {
	178	police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak,
	179	police->tcfp_mtu);
	180	police->tcfp_ptoks = police->tcfp_mtu_ptoks;
1da177e4	181	}
e9ce1cd3	182	police->tcf_action = parm->action;
1da177e4	183
7ba699c6	184	if (tb[TCA_POLICE_AVRATE])
1587bac4	185	police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	186
e9ce1cd3	187	spin_unlock_bh(&police->tcf_lock);
1da177e4 LT	188	if (ret != ACT_P_CREATED)
	189	return ret;
	190
d2de875c	191	police->tcfp_t_c = ktime_get_ns();
a85a970a	192	tcf_hash_insert(tn, *a);
1da177e4	193
1da177e4 LT	194	return ret;
1da177e4 LT	195
71bcb09a SH	196	failure_unlock:
71bcb09a SH	197	spin_unlock_bh(&police->tcf_lock);
1da177e4	198	failure:
3b69a4c9 YY	199	qdisc_put_rtab(P_tab);
3b69a4c9 YY	200	qdisc_put_rtab(R_tab);
1da177e4	201	if (ret == ACT_P_CREATED)
a85a970a	202	tcf_hash_cleanup(*a, est);
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
e9ce1cd3 DM	219	if (police->tcfp_ewma_rate &&
	220	police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
	221	police->tcf_qstats.overlimits++;
b9647580 JP	222	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	223	police->tcf_qstats.drops++;
e9ce1cd3 DM	224	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	225	return police->tcf_action;
1da177e4	226	}
1da177e4	227
0abf77e5	228	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
c6d14ff1	229	if (!police->rate_present) {
e9ce1cd3 DM	230	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	231	return police->tcfp_result;
1da177e4 LT	232	}
1da177e4 LT	233
d2de875c	234	now = ktime_get_ns();
c6d14ff1 JP	235	toks = min_t(s64, now - police->tcfp_t_c,
	236	police->tcfp_burst);
	237	if (police->peak_present) {
e9ce1cd3	238	ptoks = toks + police->tcfp_ptoks;
c6d14ff1 JP	239	if (ptoks > police->tcfp_mtu_ptoks)
	240	ptoks = police->tcfp_mtu_ptoks;
	241	ptoks -= (s64) psched_l2t_ns(&police->peak,
	242	qdisc_pkt_len(skb));
1da177e4	243	}
e9ce1cd3	244	toks += police->tcfp_toks;
c6d14ff1	245	if (toks > police->tcfp_burst)
e9ce1cd3	246	toks = police->tcfp_burst;
c6d14ff1	247	toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb));
1da177e4	248	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	249	police->tcfp_t_c = now;
	250	police->tcfp_toks = toks;
	251	police->tcfp_ptoks = ptoks;
	252	spin_unlock(&police->tcf_lock);
	253	return police->tcfp_result;
1da177e4 LT	254	}
	255	}
	256
e9ce1cd3	257	police->tcf_qstats.overlimits++;
b9647580 JP	258	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	259	police->tcf_qstats.drops++;
e9ce1cd3 DM	260	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	261	return police->tcf_action;
1da177e4 LT	262	}
	263
	264	static int
	265	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	266	{
27a884dc	267	unsigned char *b = skb_tail_pointer(skb);
a85a970a	268	struct tcf_police *police = to_police(a);
0f04cfd0 JM	269	struct tc_police opt = {
	270	.index = police->tcf_index,
	271	.action = police->tcf_action,
	272	.mtu = police->tcfp_mtu,
c6d14ff1	273	.burst = PSCHED_NS2TICKS(police->tcfp_burst),
0f04cfd0 JM	274	.refcnt = police->tcf_refcnt - ref,
	275	.bindcnt = police->tcf_bindcnt - bind,
	276	};
3d3ed181	277	struct tcf_t t;
0f04cfd0	278
c6d14ff1	279	if (police->rate_present)
01cb71d2	280	psched_ratecfg_getrate(&opt.rate, &police->rate);
c6d14ff1	281	if (police->peak_present)
01cb71d2	282	psched_ratecfg_getrate(&opt.peakrate, &police->peak);
1b34ec43 DM	283	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
	284	goto nla_put_failure;
	285	if (police->tcfp_result &&
	286	nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
	287	goto nla_put_failure;
	288	if (police->tcfp_ewma_rate &&
	289	nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
	290	goto nla_put_failure;
3d3ed181 JHS	291
	292	t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install);
	293	t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse);
53eb440f	294	t.firstuse = jiffies_to_clock_t(jiffies - police->tcf_tm.firstuse);
3d3ed181 JHS	295	t.expires = jiffies_to_clock_t(police->tcf_tm.expires);
	296	if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
	297	goto nla_put_failure;
	298
1da177e4 LT	299	return skb->len;
1da177e4 LT	300
7ba699c6	301	nla_put_failure:
dc5fc579	302	nlmsg_trim(skb, b);
1da177e4 LT	303	return -1;
	304	}
	305
a85a970a	306	static int tcf_police_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	307	{
	308	struct tc_action_net *tn = net_generic(net, police_net_id);
	309
	310	return tcf_hash_search(tn, a, index);
	311	}
	312
1da177e4 LT	313	MODULE_AUTHOR("Alexey Kuznetsov");
	314	MODULE_DESCRIPTION("Policing actions");
	315	MODULE_LICENSE("GPL");
	316
	317	static struct tc_action_ops act_police_ops = {
	318	.kind = "police",
	319	.type = TCA_ID_POLICE,
1da177e4 LT	320	.owner = THIS_MODULE,
	321	.act = tcf_act_police,
	322	.dump = tcf_act_police_dump,
d9fa17ef	323	.init = tcf_act_police_init,
ddf97ccd WC	324	.walk = tcf_act_police_walker,
ddf97ccd WC	325	.lookup = tcf_police_search,
a85a970a	326	.size = sizeof(struct tcf_police),
ddf97ccd WC	327	};
	328
	329	static __net_init int police_init_net(struct net *net)
	330	{
	331	struct tc_action_net *tn = net_generic(net, police_net_id);
	332
	333	return tc_action_net_init(tn, &act_police_ops, POL_TAB_MASK);
	334	}
	335
	336	static void __net_exit police_exit_net(struct net *net)
	337	{
	338	struct tc_action_net *tn = net_generic(net, police_net_id);
	339
	340	tc_action_net_exit(tn);
	341	}
	342
	343	static struct pernet_operations police_net_ops = {
	344	.init = police_init_net,
	345	.exit = police_exit_net,
	346	.id = &police_net_id,
	347	.size = sizeof(struct tc_action_net),
1da177e4 LT	348	};
	349
	350	static int __init
	351	police_init_module(void)
	352	{
ddf97ccd	353	return tcf_register_action(&act_police_ops, &police_net_ops);
1da177e4 LT	354	}
	355
	356	static void __exit
	357	police_cleanup_module(void)
	358	{
ddf97ccd	359	tcf_unregister_action(&act_police_ops, &police_net_ops);
1da177e4 LT	360	}
	361
	362	module_init(police_init_module);
	363	module_exit(police_cleanup_module);