[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>

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

	if (!exists) {
		ret = tcf_idr_create(tn, parm->index, NULL, a,
				     &act_police_ops, bind, false);
		if (ret)
			return ret;
		ret = ACT_P_CREATED;
	} else {
		tcf_idr_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;
		}
	}

	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);
	if (ret == ACT_P_CREATED)
		tcf_idr_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) {
		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 = 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_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_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);
}

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
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,
a85a970a	61	const struct tc_action_ops *ops)
1da177e4	62	{
ddf97ccd	63	struct tc_action_net *tn = net_generic(net, police_net_id);
1da177e4	64
b5ac8518	65	return tcf_generic_walker(tn, skb, cb, type, ops);
1da177e4	66	}
1da177e4	67
53b2bf3f PM	68	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	69	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	70	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	71	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	72	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	73	};
	74
d9fa17ef	75	static int tcf_act_police_init(struct net net, struct nlattr nla,
a85a970a	76	struct nlattr est, struct tc_action *a,
d9fa17ef	77	int ovr, int bind)
1da177e4	78	{
1da177e4	79	int ret = 0, err;
7ba699c6	80	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	81	struct tc_police *parm;
e9ce1cd3	82	struct tcf_police *police;
1da177e4	83	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
ddf97ccd	84	struct tc_action_net *tn = net_generic(net, police_net_id);
0852e455	85	bool exists = false;
1e9b3d53	86	int size;
1da177e4	87
cee63723	88	if (nla == NULL)
1da177e4 LT	89	return -EINVAL;
1da177e4 LT	90
fceb6435	91	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy, NULL);
cee63723 PM	92	if (err < 0)
	93	return err;
	94
7ba699c6	95	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	96	return -EINVAL;
7ba699c6	97	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	98	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	99	return -EINVAL;
0852e455	100
7ba699c6	101	parm = nla_data(tb[TCA_POLICE_TBF]);
65a206c0	102	exists = tcf_idr_check(tn, parm->index, a, bind);
0852e455 WC	103	if (exists && bind)
0852e455 WC	104	return 0;
1da177e4	105
0852e455	106	if (!exists) {
65a206c0 CM	107	ret = tcf_idr_create(tn, parm->index, NULL, a,
65a206c0 CM	108	&act_police_ops, bind, false);
a03e6fe5 WC	109	if (ret)
	110	return ret;
	111	ret = ACT_P_CREATED;
0852e455	112	} else {
65a206c0	113	tcf_idr_release(*a, bind);
0852e455 WC	114	if (!ovr)
0852e455 WC	115	return -EEXIST;
1da177e4 LT	116	}
1da177e4 LT	117
a85a970a	118	police = to_police(*a);
1da177e4 LT	119	if (parm->rate.rate) {
1da177e4 LT	120	err = -ENOMEM;
7ba699c6	121	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
1da177e4 LT	122	if (R_tab == NULL)
1da177e4 LT	123	goto failure;
c1b56878	124
1da177e4 LT	125	if (parm->peakrate.rate) {
1da177e4 LT	126	P_tab = qdisc_get_rtab(&parm->peakrate,
7ba699c6	127	tb[TCA_POLICE_PEAKRATE]);
71bcb09a	128	if (P_tab == NULL)
1da177e4	129	goto failure;
1da177e4 LT	130	}
1da177e4 LT	131	}
71bcb09a	132
71bcb09a	133	if (est) {
22e0f8b9	134	err = gen_replace_estimator(&police->tcf_bstats, NULL,
71bcb09a	135	&police->tcf_rate_est,
edb09eb1 ED	136	&police->tcf_lock,
edb09eb1 ED	137	NULL, est);
71bcb09a	138	if (err)
74030603	139	goto failure;
a883bf56 JP	140	} else if (tb[TCA_POLICE_AVRATE] &&
a883bf56 JP	141	(ret == ACT_P_CREATED \|\|
1c0d32fd	142	!gen_estimator_active(&police->tcf_rate_est))) {
a883bf56	143	err = -EINVAL;
74030603	144	goto failure;
71bcb09a SH	145	}
71bcb09a SH	146
74030603	147	spin_lock_bh(&police->tcf_lock);
71bcb09a	148	/* No failure allowed after this point */
c6d14ff1 JP	149	police->tcfp_mtu = parm->mtu;
	150	if (police->tcfp_mtu == 0) {
	151	police->tcfp_mtu = ~0;
	152	if (R_tab)
	153	police->tcfp_mtu = 255 << R_tab->rate.cell_log;
	154	}
	155	if (R_tab) {
	156	police->rate_present = true;
3e1e3aae	157	psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0);
c6d14ff1 JP	158	qdisc_put_rtab(R_tab);
	159	} else {
	160	police->rate_present = false;
1da177e4	161	}
c6d14ff1 JP	162	if (P_tab) {
c6d14ff1 JP	163	police->peak_present = true;
3e1e3aae	164	psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0);
c6d14ff1 JP	165	qdisc_put_rtab(P_tab);
	166	} else {
	167	police->peak_present = false;
1da177e4 LT	168	}
1da177e4 LT	169
7ba699c6	170	if (tb[TCA_POLICE_RESULT])
1587bac4	171	police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
c6d14ff1 JP	172	police->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
	173	police->tcfp_toks = police->tcfp_burst;
	174	if (police->peak_present) {
	175	police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak,
	176	police->tcfp_mtu);
	177	police->tcfp_ptoks = police->tcfp_mtu_ptoks;
1da177e4	178	}
e9ce1cd3	179	police->tcf_action = parm->action;
1da177e4	180
7ba699c6	181	if (tb[TCA_POLICE_AVRATE])
1587bac4	182	police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	183
e9ce1cd3	184	spin_unlock_bh(&police->tcf_lock);
1da177e4 LT	185	if (ret != ACT_P_CREATED)
	186	return ret;
	187
d2de875c	188	police->tcfp_t_c = ktime_get_ns();
65a206c0	189	tcf_idr_insert(tn, *a);
1da177e4	190
1da177e4 LT	191	return ret;
	192
	193	failure:
3b69a4c9 YY	194	qdisc_put_rtab(P_tab);
3b69a4c9 YY	195	qdisc_put_rtab(R_tab);
1da177e4	196	if (ret == ACT_P_CREATED)
65a206c0	197	tcf_idr_cleanup(*a, est);
1da177e4 LT	198	return err;
	199	}
	200
dc7f9f6e	201	static int tcf_act_police(struct sk_buff skb, const struct tc_action a,
10297b99	202	struct tcf_result *res)
1da177e4	203	{
a85a970a	204	struct tcf_police *police = to_police(a);
c6d14ff1 JP	205	s64 now;
	206	s64 toks;
	207	s64 ptoks = 0;
1da177e4	208
e9ce1cd3	209	spin_lock(&police->tcf_lock);
1da177e4	210
bfe0d029	211	bstats_update(&police->tcf_bstats, skb);
3d3ed181	212	tcf_lastuse_update(&police->tcf_tm);
1da177e4	213
1c0d32fd ED	214	if (police->tcfp_ewma_rate) {
	215	struct gnet_stats_rate_est64 sample;
	216
	217	if (!gen_estimator_read(&police->tcf_rate_est, &sample) \|\|
	218	sample.bps >= police->tcfp_ewma_rate) {
	219	police->tcf_qstats.overlimits++;
	220	if (police->tcf_action == TC_ACT_SHOT)
	221	police->tcf_qstats.drops++;
	222	spin_unlock(&police->tcf_lock);
	223	return police->tcf_action;
	224	}
1da177e4	225	}
1da177e4	226
0abf77e5	227	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
c6d14ff1	228	if (!police->rate_present) {
e9ce1cd3 DM	229	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	230	return police->tcfp_result;
1da177e4 LT	231	}
1da177e4 LT	232
d2de875c	233	now = ktime_get_ns();
c6d14ff1 JP	234	toks = min_t(s64, now - police->tcfp_t_c,
	235	police->tcfp_burst);
	236	if (police->peak_present) {
e9ce1cd3	237	ptoks = toks + police->tcfp_ptoks;
c6d14ff1 JP	238	if (ptoks > police->tcfp_mtu_ptoks)
	239	ptoks = police->tcfp_mtu_ptoks;
	240	ptoks -= (s64) psched_l2t_ns(&police->peak,
	241	qdisc_pkt_len(skb));
1da177e4	242	}
e9ce1cd3	243	toks += police->tcfp_toks;
c6d14ff1	244	if (toks > police->tcfp_burst)
e9ce1cd3	245	toks = police->tcfp_burst;
c6d14ff1	246	toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb));
1da177e4	247	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	248	police->tcfp_t_c = now;
	249	police->tcfp_toks = toks;
	250	police->tcfp_ptoks = ptoks;
f71b109f RM	251	if (police->tcfp_result == TC_ACT_SHOT)
f71b109f RM	252	police->tcf_qstats.drops++;
e9ce1cd3 DM	253	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	254	return police->tcfp_result;
1da177e4 LT	255	}
	256	}
	257
e9ce1cd3	258	police->tcf_qstats.overlimits++;
b9647580 JP	259	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	260	police->tcf_qstats.drops++;
e9ce1cd3 DM	261	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	262	return police->tcf_action;
1da177e4 LT	263	}
1da177e4 LT	264
5a7a5555 JHS	265	static int tcf_act_police_dump(struct sk_buff skb, struct tc_action a,
5a7a5555 JHS	266	int bind, int ref)
1da177e4	267	{
27a884dc	268	unsigned char *b = skb_tail_pointer(skb);
a85a970a	269	struct tcf_police *police = to_police(a);
0f04cfd0 JM	270	struct tc_police opt = {
	271	.index = police->tcf_index,
	272	.action = police->tcf_action,
	273	.mtu = police->tcfp_mtu,
c6d14ff1	274	.burst = PSCHED_NS2TICKS(police->tcfp_burst),
0f04cfd0 JM	275	.refcnt = police->tcf_refcnt - ref,
	276	.bindcnt = police->tcf_bindcnt - bind,
	277	};
3d3ed181	278	struct tcf_t t;
0f04cfd0	279
c6d14ff1	280	if (police->rate_present)
01cb71d2	281	psched_ratecfg_getrate(&opt.rate, &police->rate);
c6d14ff1	282	if (police->peak_present)
01cb71d2	283	psched_ratecfg_getrate(&opt.peakrate, &police->peak);
1b34ec43 DM	284	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
	285	goto nla_put_failure;
	286	if (police->tcfp_result &&
	287	nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
	288	goto nla_put_failure;
	289	if (police->tcfp_ewma_rate &&
	290	nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
	291	goto nla_put_failure;
3d3ed181 JHS	292
	293	t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install);
	294	t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse);
53eb440f	295	t.firstuse = jiffies_to_clock_t(jiffies - police->tcf_tm.firstuse);
3d3ed181 JHS	296	t.expires = jiffies_to_clock_t(police->tcf_tm.expires);
	297	if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
	298	goto nla_put_failure;
	299
1da177e4 LT	300	return skb->len;
1da177e4 LT	301
7ba699c6	302	nla_put_failure:
dc5fc579	303	nlmsg_trim(skb, b);
1da177e4 LT	304	return -1;
	305	}
	306
a85a970a	307	static int tcf_police_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	308	{
	309	struct tc_action_net *tn = net_generic(net, police_net_id);
	310
65a206c0	311	return tcf_idr_search(tn, a, index);
ddf97ccd WC	312	}
ddf97ccd WC	313
1da177e4 LT	314	MODULE_AUTHOR("Alexey Kuznetsov");
	315	MODULE_DESCRIPTION("Policing actions");
	316	MODULE_LICENSE("GPL");
	317
	318	static struct tc_action_ops act_police_ops = {
	319	.kind = "police",
	320	.type = TCA_ID_POLICE,
1da177e4 LT	321	.owner = THIS_MODULE,
	322	.act = tcf_act_police,
	323	.dump = tcf_act_police_dump,
d9fa17ef	324	.init = tcf_act_police_init,
ddf97ccd WC	325	.walk = tcf_act_police_walker,
ddf97ccd WC	326	.lookup = tcf_police_search,
a85a970a	327	.size = sizeof(struct tcf_police),
ddf97ccd WC	328	};
	329
	330	static __net_init int police_init_net(struct net *net)
	331	{
	332	struct tc_action_net *tn = net_generic(net, police_net_id);
	333
c7e460ce	334	return tc_action_net_init(tn, &act_police_ops);
ddf97ccd WC	335	}
	336
	337	static void __net_exit police_exit_net(struct net *net)
	338	{
	339	struct tc_action_net *tn = net_generic(net, police_net_id);
	340
	341	tc_action_net_exit(tn);
	342	}
	343
	344	static struct pernet_operations police_net_ops = {
	345	.init = police_init_net,
	346	.exit = police_exit_net,
	347	.id = &police_net_id,
	348	.size = sizeof(struct tc_action_net),
1da177e4 LT	349	};
1da177e4 LT	350
5a7a5555	351	static int __init police_init_module(void)
1da177e4	352	{
ddf97ccd	353	return tcf_register_action(&act_police_ops, &police_net_ops);
1da177e4 LT	354	}
1da177e4 LT	355
5a7a5555	356	static void __exit police_cleanup_module(void)
1da177e4	357	{
ddf97ccd	358	tcf_unregister_action(&act_police_ops, &police_net_ops);
1da177e4 LT	359	}
	360
	361	module_init(police_init_module);
	362	module_exit(police_cleanup_module);