[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_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);
	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;
	} 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;
	}

	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_police_act(struct sk_buff *skb, const struct tc_action *a,
			  struct tcf_result *res)
{
	struct tcf_police *police = to_police(a);
	s64 now, toks, ptoks = 0;
	int ret;

	tcf_lastuse_update(&police->tcf_tm);
	bstats_cpu_update(this_cpu_ptr(police->common.cpu_bstats), skb);

	spin_lock(&police->tcf_lock);
	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) {
			ret = police->tcf_action;
			goto inc_overlimits;
		}
	}

	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
		if (!police->rate_present) {
			ret = police->tcfp_result;
			goto unlock;
		}

		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;
			ret = police->tcfp_result;
			goto inc_drops;
		}
	}
	ret = police->tcf_action;

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));
unlock:
	spin_unlock(&police->tcf_lock);
	return ret;
}

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 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;
	opt.mtu = police->tcfp_mtu;
	opt.burst = PSCHED_NS2TICKS(police->tcfp_burst);
	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;
	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,
	.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	58
2ac06347	59	static int tcf_police_walker(struct net net, struct sk_buff skb,
ddf97ccd	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
2ac06347	76	static int tcf_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	112	ret = tcf_idr_create(tn, parm->index, NULL, a,
93be42f9	113	&act_police_ops, bind, true);
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) {
93be42f9 DC	140	err = gen_replace_estimator(&police->tcf_bstats,
93be42f9 DC	141	police->common.cpu_bstats,
71bcb09a	142	&police->tcf_rate_est,
edb09eb1 ED	143	&police->tcf_lock,
edb09eb1 ED	144	NULL, est);
71bcb09a	145	if (err)
74030603	146	goto failure;
a883bf56 JP	147	} else if (tb[TCA_POLICE_AVRATE] &&
a883bf56 JP	148	(ret == ACT_P_CREATED \|\|
1c0d32fd	149	!gen_estimator_active(&police->tcf_rate_est))) {
a883bf56	150	err = -EINVAL;
74030603	151	goto failure;
71bcb09a SH	152	}
71bcb09a SH	153
74030603	154	spin_lock_bh(&police->tcf_lock);
71bcb09a	155	/* No failure allowed after this point */
c6d14ff1 JP	156	police->tcfp_mtu = parm->mtu;
	157	if (police->tcfp_mtu == 0) {
	158	police->tcfp_mtu = ~0;
	159	if (R_tab)
	160	police->tcfp_mtu = 255 << R_tab->rate.cell_log;
	161	}
	162	if (R_tab) {
	163	police->rate_present = true;
3e1e3aae	164	psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0);
c6d14ff1 JP	165	qdisc_put_rtab(R_tab);
	166	} else {
	167	police->rate_present = false;
1da177e4	168	}
c6d14ff1 JP	169	if (P_tab) {
c6d14ff1 JP	170	police->peak_present = true;
3e1e3aae	171	psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0);
c6d14ff1 JP	172	qdisc_put_rtab(P_tab);
	173	} else {
	174	police->peak_present = false;
1da177e4 LT	175	}
1da177e4 LT	176
7ba699c6	177	if (tb[TCA_POLICE_RESULT])
1587bac4	178	police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
c6d14ff1 JP	179	police->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
	180	police->tcfp_toks = police->tcfp_burst;
	181	if (police->peak_present) {
	182	police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak,
	183	police->tcfp_mtu);
	184	police->tcfp_ptoks = police->tcfp_mtu_ptoks;
1da177e4	185	}
e9ce1cd3	186	police->tcf_action = parm->action;
1da177e4	187
7ba699c6	188	if (tb[TCA_POLICE_AVRATE])
1587bac4	189	police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	190
e9ce1cd3	191	spin_unlock_bh(&police->tcf_lock);
1da177e4 LT	192	if (ret != ACT_P_CREATED)
	193	return ret;
	194
d2de875c	195	police->tcfp_t_c = ktime_get_ns();
65a206c0	196	tcf_idr_insert(tn, *a);
1da177e4	197
1da177e4 LT	198	return ret;
	199
	200	failure:
3b69a4c9 YY	201	qdisc_put_rtab(P_tab);
3b69a4c9 YY	202	qdisc_put_rtab(R_tab);
4e8ddd7f	203	tcf_idr_release(*a, bind);
1da177e4 LT	204	return err;
	205	}
	206
2ac06347	207	static int tcf_police_act(struct sk_buff skb, const struct tc_action a,
10297b99	208	struct tcf_result *res)
1da177e4	209	{
a85a970a	210	struct tcf_police *police = to_police(a);
93be42f9 DC	211	s64 now, toks, ptoks = 0;
93be42f9 DC	212	int ret;
1da177e4	213
3d3ed181	214	tcf_lastuse_update(&police->tcf_tm);
93be42f9	215	bstats_cpu_update(this_cpu_ptr(police->common.cpu_bstats), skb);
1da177e4	216
93be42f9	217	spin_lock(&police->tcf_lock);
1c0d32fd ED	218	if (police->tcfp_ewma_rate) {
	219	struct gnet_stats_rate_est64 sample;
	220
	221	if (!gen_estimator_read(&police->tcf_rate_est, &sample) \|\|
	222	sample.bps >= police->tcfp_ewma_rate) {
93be42f9 DC	223	ret = police->tcf_action;
93be42f9 DC	224	goto inc_overlimits;
1c0d32fd	225	}
1da177e4	226	}
1da177e4	227
0abf77e5	228	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
c6d14ff1	229	if (!police->rate_present) {
93be42f9 DC	230	ret = police->tcfp_result;
93be42f9 DC	231	goto unlock;
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;
93be42f9 DC	252	ret = police->tcfp_result;
93be42f9 DC	253	goto inc_drops;
1da177e4 LT	254	}
1da177e4 LT	255	}
93be42f9 DC	256	ret = police->tcf_action;
	257
	258	inc_overlimits:
	259	qstats_overlimit_inc(this_cpu_ptr(police->common.cpu_qstats));
	260	inc_drops:
	261	if (ret == TC_ACT_SHOT)
	262	qstats_drop_inc(this_cpu_ptr(police->common.cpu_qstats));
	263	unlock:
e9ce1cd3	264	spin_unlock(&police->tcf_lock);
93be42f9	265	return ret;
1da177e4 LT	266	}
1da177e4 LT	267
2ac06347	268	static int tcf_police_dump(struct sk_buff skb, struct tc_action a,
5a7a5555	269	int bind, int ref)
1da177e4	270	{
27a884dc	271	unsigned char *b = skb_tail_pointer(skb);
a85a970a	272	struct tcf_police *police = to_police(a);
0f04cfd0 JM	273	struct tc_police opt = {
0f04cfd0 JM	274	.index = police->tcf_index,
036bb443 VB	275	.refcnt = refcount_read(&police->tcf_refcnt) - ref,
036bb443 VB	276	.bindcnt = atomic_read(&police->tcf_bindcnt) - bind,
0f04cfd0	277	};
3d3ed181	278	struct tcf_t t;
0f04cfd0	279
e329bc42 VB	280	spin_lock_bh(&police->tcf_lock);
	281	opt.action = police->tcf_action;
	282	opt.mtu = police->tcfp_mtu;
	283	opt.burst = PSCHED_NS2TICKS(police->tcfp_burst);
c6d14ff1	284	if (police->rate_present)
01cb71d2	285	psched_ratecfg_getrate(&opt.rate, &police->rate);
c6d14ff1	286	if (police->peak_present)
01cb71d2	287	psched_ratecfg_getrate(&opt.peakrate, &police->peak);
1b34ec43 DM	288	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
	289	goto nla_put_failure;
	290	if (police->tcfp_result &&
	291	nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
	292	goto nla_put_failure;
	293	if (police->tcfp_ewma_rate &&
	294	nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
	295	goto nla_put_failure;
3d3ed181 JHS	296
	297	t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install);
	298	t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse);
53eb440f	299	t.firstuse = jiffies_to_clock_t(jiffies - police->tcf_tm.firstuse);
3d3ed181 JHS	300	t.expires = jiffies_to_clock_t(police->tcf_tm.expires);
	301	if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
	302	goto nla_put_failure;
e329bc42	303	spin_unlock_bh(&police->tcf_lock);
3d3ed181	304
1da177e4 LT	305	return skb->len;
1da177e4 LT	306
7ba699c6	307	nla_put_failure:
e329bc42	308	spin_unlock_bh(&police->tcf_lock);
dc5fc579	309	nlmsg_trim(skb, b);
1da177e4 LT	310	return -1;
	311	}
	312
f061b48c	313	static int tcf_police_search(struct net net, struct tc_action *a, u32 index)
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
1da177e4 LT	320	MODULE_AUTHOR("Alexey Kuznetsov");
	321	MODULE_DESCRIPTION("Policing actions");
	322	MODULE_LICENSE("GPL");
	323
	324	static struct tc_action_ops act_police_ops = {
	325	.kind = "police",
	326	.type = TCA_ID_POLICE,
1da177e4	327	.owner = THIS_MODULE,
2ac06347 JHS	328	.act = tcf_police_act,
	329	.dump = tcf_police_dump,
	330	.init = tcf_police_init,
	331	.walk = tcf_police_walker,
ddf97ccd	332	.lookup = tcf_police_search,
a85a970a	333	.size = sizeof(struct tcf_police),
ddf97ccd WC	334	};
	335
	336	static __net_init int police_init_net(struct net *net)
	337	{
	338	struct tc_action_net *tn = net_generic(net, police_net_id);
	339
c7e460ce	340	return tc_action_net_init(tn, &act_police_ops);
ddf97ccd WC	341	}
ddf97ccd WC	342
039af9c6	343	static void __net_exit police_exit_net(struct list_head *net_list)
ddf97ccd	344	{
039af9c6	345	tc_action_net_exit(net_list, police_net_id);
ddf97ccd WC	346	}
	347
	348	static struct pernet_operations police_net_ops = {
	349	.init = police_init_net,
039af9c6	350	.exit_batch = police_exit_net,
ddf97ccd WC	351	.id = &police_net_id,
ddf97ccd WC	352	.size = sizeof(struct tc_action_net),
1da177e4 LT	353	};
1da177e4 LT	354
5a7a5555	355	static int __init police_init_module(void)
1da177e4	356	{
ddf97ccd	357	return tcf_register_action(&act_police_ops, &police_net_ops);
1da177e4 LT	358	}
1da177e4 LT	359
5a7a5555	360	static void __exit police_cleanup_module(void)
1da177e4	361	{
ddf97ccd	362	tcf_unregister_action(&act_police_ops, &police_net_ops);
1da177e4 LT	363	}
	364
	365	module_init(police_init_module);
	366	module_exit(police_cleanup_module);