[mirror_ubuntu-zesty-kernel.git] / net / sched / act_police.c

/*
 * net/sched/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 tcf_common	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)	\
	container_of(pc, struct tcf_police, common)

#define POL_TAB_MASK     15
static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1];
static u32 police_idx_gen;
static DEFINE_RWLOCK(police_lock);

static struct tcf_hashinfo police_hash_info = {
	.htab	=	tcf_police_ht,
	.hmask	=	POL_TAB_MASK,
	.lock	=	&police_lock,
};

/* 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 tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *cb,
			      int type, struct tc_action *a)
{
	struct tcf_common *p;
	int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
	struct nlattr *nest;

	read_lock_bh(&police_lock);

	s_i = cb->args[0];

	for (i = 0; i < (POL_TAB_MASK + 1); i++) {
		p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)];

		for (; p; p = p->tcfc_next) {
			index++;
			if (index < s_i)
				continue;
			a->priv = p;
			a->order = index;
			nest = nla_nest_start(skb, a->order);
			if (nest == NULL)
				goto nla_put_failure;
			if (type == RTM_DELACTION)
				err = tcf_action_dump_1(skb, a, 0, 1);
			else
				err = tcf_action_dump_1(skb, a, 0, 0);
			if (err < 0) {
				index--;
				nla_nest_cancel(skb, nest);
				goto done;
			}
			nla_nest_end(skb, nest);
			n_i++;
		}
	}
done:
	read_unlock_bh(&police_lock);
	if (n_i)
		cb->args[0] += n_i;
	return n_i;

nla_put_failure:
	nla_nest_cancel(skb, nest);
	goto done;
}

static void tcf_police_destroy(struct tcf_police *p)
{
	unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
	struct tcf_common **p1p;

	for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
		if (*p1p == &p->common) {
			write_lock_bh(&police_lock);
			*p1p = p->tcf_next;
			write_unlock_bh(&police_lock);
			gen_kill_estimator(&p->tcf_bstats,
					   &p->tcf_rate_est);
			/*
			 * gen_estimator est_timer() might access p->tcf_lock
			 * or bstats, wait a RCU grace period before freeing p
			 */
			kfree_rcu(p, tcf_rcu);
			return;
		}
	}
	WARN_ON(1);
}

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_locate(struct net *net, struct nlattr *nla,
				 struct nlattr *est, struct tc_action *a,
				 int ovr, int bind)
{
	unsigned int h;
	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;
	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]);

	if (parm->index) {
		struct tcf_common *pc;

		pc = tcf_hash_lookup(parm->index, &police_hash_info);
		if (pc != NULL) {
			a->priv = pc;
			police = to_police(pc);
			if (bind) {
				police->tcf_bindcnt += 1;
				police->tcf_refcnt += 1;
				return 0;
			}
			if (ovr)
				goto override;
			/* not replacing */
			return -EEXIST;
		}
	}

	police = kzalloc(sizeof(*police), GFP_KERNEL);
	if (police == NULL)
		return -ENOMEM;
	ret = ACT_P_CREATED;
	police->tcf_refcnt = 1;
	spin_lock_init(&police->tcf_lock);
	if (bind)
		police->tcf_bindcnt = 1;
override:
	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,
					    &police->tcf_rate_est,
					    &police->tcf_lock, 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_to_ns(ktime_get());
	police->tcf_index = parm->index ? parm->index :
		tcf_hash_new_index(&police_idx_gen, &police_hash_info);
	h = tcf_hash(police->tcf_index, POL_TAB_MASK);
	write_lock_bh(&police_lock);
	police->tcf_next = tcf_police_ht[h];
	tcf_police_ht[h] = &police->common;
	write_unlock_bh(&police_lock);

	a->priv = police;
	return ret;

failure_unlock:
	spin_unlock_bh(&police->tcf_lock);
failure:
	if (P_tab)
		qdisc_put_rtab(P_tab);
	if (R_tab)
		qdisc_put_rtab(R_tab);
	if (ret == ACT_P_CREATED)
		kfree(police);
	return err;
}

static int tcf_act_police_cleanup(struct tc_action *a, int bind)
{
	struct tcf_police *p = a->priv;
	int ret = 0;

	if (p != NULL) {
		if (bind)
			p->tcf_bindcnt--;

		p->tcf_refcnt--;
		if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) {
			tcf_police_destroy(p);
			ret = 1;
		}
	}
	return ret;
}

static int tcf_act_police(struct sk_buff *skb, const struct tc_action *a,
			  struct tcf_result *res)
{
	struct tcf_police *police = a->priv;
	s64 now;
	s64 toks;
	s64 ptoks = 0;

	spin_lock(&police->tcf_lock);

	bstats_update(&police->tcf_bstats, skb);

	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_to_ns(ktime_get());
		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 = a->priv;
	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,
	};

	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;
	return skb->len;

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

MODULE_AUTHOR("Alexey Kuznetsov");
MODULE_DESCRIPTION("Policing actions");
MODULE_LICENSE("GPL");

static struct tc_action_ops act_police_ops = {
	.kind		=	"police",
	.hinfo		=	&police_hash_info,
	.type		=	TCA_ID_POLICE,
	.capab		=	TCA_CAP_NONE,
	.owner		=	THIS_MODULE,
	.act		=	tcf_act_police,
	.dump		=	tcf_act_police_dump,
	.cleanup	=	tcf_act_police_cleanup,
	.init		=	tcf_act_police_locate,
	.walk		=	tcf_act_police_walker
};

static int __init
police_init_module(void)
{
	return tcf_register_action(&act_police_ops);
}

static void __exit
police_cleanup_module(void)
{
	tcf_unregister_action(&act_police_ops);
}

module_init(police_init_module);
module_exit(police_cleanup_module);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* net/sched/police.c Input police filter.
	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 JP	25	struct tcf_police {
	26	struct tcf_common common;
	27	int tcfp_result;
	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 JP	39	};
	40	#define to_police(pc) \
	41	container_of(pc, struct tcf_police, common)
	42
e9ce1cd3 DM	43	#define POL_TAB_MASK 15
	44	static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1];
	45	static u32 police_idx_gen;
	46	static DEFINE_RWLOCK(police_lock);
1da177e4	47
e9ce1cd3 DM	48	static struct tcf_hashinfo police_hash_info = {
	49	.htab = tcf_police_ht,
	50	.hmask = POL_TAB_MASK,
	51	.lock = &police_lock,
	52	};
1da177e4	53
1e9b3d53	54	/* old policer structure from before tc actions */
cc7ec456	55	struct tc_police_compat {
1e9b3d53 PM	56	u32 index;
	57	int action;
	58	u32 limit;
	59	u32 burst;
	60	u32 mtu;
	61	struct tc_ratespec rate;
	62	struct tc_ratespec peakrate;
	63	};
	64
e9ce1cd3	65	/* Each policer is serialized by its individual spinlock */
1da177e4	66
83b950c8	67	static int tcf_act_police_walker(struct sk_buff skb, struct netlink_callback cb,
10297b99	68	int type, struct tc_action *a)
1da177e4	69	{
e9ce1cd3	70	struct tcf_common *p;
1da177e4	71	int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
4b3550ef	72	struct nlattr *nest;
1da177e4	73
e1e992e5	74	read_lock_bh(&police_lock);
1da177e4 LT	75
	76	s_i = cb->args[0];
	77
e9ce1cd3 DM	78	for (i = 0; i < (POL_TAB_MASK + 1); i++) {
e9ce1cd3 DM	79	p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)];
1da177e4	80
e9ce1cd3	81	for (; p; p = p->tcfc_next) {
1da177e4 LT	82	index++;
	83	if (index < s_i)
	84	continue;
	85	a->priv = p;
	86	a->order = index;
4b3550ef PM	87	nest = nla_nest_start(skb, a->order);
	88	if (nest == NULL)
	89	goto nla_put_failure;
1da177e4 LT	90	if (type == RTM_DELACTION)
	91	err = tcf_action_dump_1(skb, a, 0, 1);
	92	else
	93	err = tcf_action_dump_1(skb, a, 0, 0);
	94	if (err < 0) {
	95	index--;
4b3550ef	96	nla_nest_cancel(skb, nest);
1da177e4 LT	97	goto done;
1da177e4 LT	98	}
4b3550ef	99	nla_nest_end(skb, nest);
1da177e4 LT	100	n_i++;
	101	}
	102	}
	103	done:
e1e992e5	104	read_unlock_bh(&police_lock);
1da177e4 LT	105	if (n_i)
	106	cb->args[0] += n_i;
	107	return n_i;
	108
7ba699c6	109	nla_put_failure:
4b3550ef	110	nla_nest_cancel(skb, nest);
1da177e4 LT	111	goto done;
1da177e4 LT	112	}
1da177e4	113
c3bc7cff	114	static void tcf_police_destroy(struct tcf_police *p)
1da177e4	115	{
e9ce1cd3 DM	116	unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
e9ce1cd3 DM	117	struct tcf_common **p1p;
10297b99	118
e9ce1cd3 DM	119	for (p1p = &tcf_police_ht[h]; p1p; p1p = &(p1p)->tcfc_next) {
e9ce1cd3 DM	120	if (*p1p == &p->common) {
1da177e4	121	write_lock_bh(&police_lock);
e9ce1cd3	122	*p1p = p->tcf_next;
1da177e4	123	write_unlock_bh(&police_lock);
e9ce1cd3 DM	124	gen_kill_estimator(&p->tcf_bstats,
e9ce1cd3 DM	125	&p->tcf_rate_est);
c7de2cf0 ED	126	/*
	127	* gen_estimator est_timer() might access p->tcf_lock
	128	* or bstats, wait a RCU grace period before freeing p
	129	*/
5957b1ac	130	kfree_rcu(p, tcf_rcu);
1da177e4 LT	131	return;
	132	}
	133	}
547b792c	134	WARN_ON(1);
1da177e4 LT	135	}
1da177e4 LT	136
53b2bf3f PM	137	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	138	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	139	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	140	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	141	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	142	};
	143
c1b52739 BL	144	static int tcf_act_police_locate(struct net net, struct nlattr nla,
	145	struct nlattr est, struct tc_action a,
	146	int ovr, int bind)
1da177e4	147	{
cc7ec456	148	unsigned int h;
1da177e4	149	int ret = 0, err;
7ba699c6	150	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	151	struct tc_police *parm;
e9ce1cd3	152	struct tcf_police *police;
1da177e4	153	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
1e9b3d53	154	int size;
1da177e4	155
cee63723	156	if (nla == NULL)
1da177e4 LT	157	return -EINVAL;
1da177e4 LT	158
53b2bf3f	159	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
cee63723 PM	160	if (err < 0)
	161	return err;
	162
7ba699c6	163	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	164	return -EINVAL;
7ba699c6	165	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	166	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	167	return -EINVAL;
7ba699c6	168	parm = nla_data(tb[TCA_POLICE_TBF]);
1da177e4	169
e9ce1cd3 DM	170	if (parm->index) {
	171	struct tcf_common *pc;
	172
	173	pc = tcf_hash_lookup(parm->index, &police_hash_info);
	174	if (pc != NULL) {
	175	a->priv = pc;
	176	police = to_police(pc);
	177	if (bind) {
	178	police->tcf_bindcnt += 1;
	179	police->tcf_refcnt += 1;
1a29321e	180	return 0;
e9ce1cd3 DM	181	}
	182	if (ovr)
	183	goto override;
1a29321e JHS	184	/* not replacing */
1a29321e JHS	185	return -EEXIST;
1da177e4	186	}
1da177e4 LT	187	}
1da177e4 LT	188
e9ce1cd3 DM	189	police = kzalloc(sizeof(*police), GFP_KERNEL);
e9ce1cd3 DM	190	if (police == NULL)
1da177e4	191	return -ENOMEM;
1da177e4	192	ret = ACT_P_CREATED;
e9ce1cd3 DM	193	police->tcf_refcnt = 1;
e9ce1cd3 DM	194	spin_lock_init(&police->tcf_lock);
1da177e4	195	if (bind)
e9ce1cd3	196	police->tcf_bindcnt = 1;
1da177e4 LT	197	override:
	198	if (parm->rate.rate) {
	199	err = -ENOMEM;
7ba699c6	200	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
1da177e4 LT	201	if (R_tab == NULL)
1da177e4 LT	202	goto failure;
c1b56878	203
1da177e4 LT	204	if (parm->peakrate.rate) {
1da177e4 LT	205	P_tab = qdisc_get_rtab(&parm->peakrate,
7ba699c6	206	tb[TCA_POLICE_PEAKRATE]);
71bcb09a	207	if (P_tab == NULL)
1da177e4	208	goto failure;
1da177e4 LT	209	}
1da177e4 LT	210	}
71bcb09a	211
e9ce1cd3	212	spin_lock_bh(&police->tcf_lock);
71bcb09a SH	213	if (est) {
	214	err = gen_replace_estimator(&police->tcf_bstats,
	215	&police->tcf_rate_est,
	216	&police->tcf_lock, est);
	217	if (err)
	218	goto failure_unlock;
a883bf56 JP	219	} else if (tb[TCA_POLICE_AVRATE] &&
	220	(ret == ACT_P_CREATED \|\|
	221	!gen_estimator_active(&police->tcf_bstats,
	222	&police->tcf_rate_est))) {
	223	err = -EINVAL;
	224	goto failure_unlock;
71bcb09a SH	225	}
	226
	227	/* No failure allowed after this point */
c6d14ff1 JP	228	police->tcfp_mtu = parm->mtu;
	229	if (police->tcfp_mtu == 0) {
	230	police->tcfp_mtu = ~0;
	231	if (R_tab)
	232	police->tcfp_mtu = 255 << R_tab->rate.cell_log;
	233	}
	234	if (R_tab) {
	235	police->rate_present = true;
3e1e3aae	236	psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0);
c6d14ff1 JP	237	qdisc_put_rtab(R_tab);
	238	} else {
	239	police->rate_present = false;
1da177e4	240	}
c6d14ff1 JP	241	if (P_tab) {
c6d14ff1 JP	242	police->peak_present = true;
3e1e3aae	243	psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0);
c6d14ff1 JP	244	qdisc_put_rtab(P_tab);
	245	} else {
	246	police->peak_present = false;
1da177e4 LT	247	}
1da177e4 LT	248
7ba699c6	249	if (tb[TCA_POLICE_RESULT])
1587bac4	250	police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
c6d14ff1 JP	251	police->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
	252	police->tcfp_toks = police->tcfp_burst;
	253	if (police->peak_present) {
	254	police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak,
	255	police->tcfp_mtu);
	256	police->tcfp_ptoks = police->tcfp_mtu_ptoks;
1da177e4	257	}
e9ce1cd3	258	police->tcf_action = parm->action;
1da177e4	259
7ba699c6	260	if (tb[TCA_POLICE_AVRATE])
1587bac4	261	police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	262
e9ce1cd3	263	spin_unlock_bh(&police->tcf_lock);
1da177e4 LT	264	if (ret != ACT_P_CREATED)
	265	return ret;
	266
c6d14ff1	267	police->tcfp_t_c = ktime_to_ns(ktime_get());
e9ce1cd3 DM	268	police->tcf_index = parm->index ? parm->index :
	269	tcf_hash_new_index(&police_idx_gen, &police_hash_info);
	270	h = tcf_hash(police->tcf_index, POL_TAB_MASK);
1da177e4	271	write_lock_bh(&police_lock);
e9ce1cd3 DM	272	police->tcf_next = tcf_police_ht[h];
e9ce1cd3 DM	273	tcf_police_ht[h] = &police->common;
1da177e4 LT	274	write_unlock_bh(&police_lock);
1da177e4 LT	275
e9ce1cd3	276	a->priv = police;
1da177e4 LT	277	return ret;
1da177e4 LT	278
71bcb09a SH	279	failure_unlock:
71bcb09a SH	280	spin_unlock_bh(&police->tcf_lock);
1da177e4	281	failure:
71bcb09a SH	282	if (P_tab)
	283	qdisc_put_rtab(P_tab);
	284	if (R_tab)
	285	qdisc_put_rtab(R_tab);
1da177e4	286	if (ret == ACT_P_CREATED)
e9ce1cd3	287	kfree(police);
1da177e4 LT	288	return err;
	289	}
	290
	291	static int tcf_act_police_cleanup(struct tc_action *a, int bind)
	292	{
e9ce1cd3	293	struct tcf_police *p = a->priv;
c3bc7cff	294	int ret = 0;
1da177e4	295
c3bc7cff PM	296	if (p != NULL) {
	297	if (bind)
	298	p->tcf_bindcnt--;
	299
	300	p->tcf_refcnt--;
	301	if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) {
	302	tcf_police_destroy(p);
	303	ret = 1;
	304	}
	305	}
	306	return ret;
1da177e4 LT	307	}
1da177e4 LT	308
dc7f9f6e	309	static int tcf_act_police(struct sk_buff skb, const struct tc_action a,
10297b99	310	struct tcf_result *res)
1da177e4	311	{
e9ce1cd3	312	struct tcf_police *police = a->priv;
c6d14ff1 JP	313	s64 now;
	314	s64 toks;
	315	s64 ptoks = 0;
1da177e4	316
e9ce1cd3	317	spin_lock(&police->tcf_lock);
1da177e4	318
bfe0d029	319	bstats_update(&police->tcf_bstats, skb);
1da177e4	320
e9ce1cd3 DM	321	if (police->tcfp_ewma_rate &&
	322	police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
	323	police->tcf_qstats.overlimits++;
b9647580 JP	324	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	325	police->tcf_qstats.drops++;
e9ce1cd3 DM	326	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	327	return police->tcf_action;
1da177e4	328	}
1da177e4	329
0abf77e5	330	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
c6d14ff1	331	if (!police->rate_present) {
e9ce1cd3 DM	332	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	333	return police->tcfp_result;
1da177e4 LT	334	}
1da177e4 LT	335
c6d14ff1 JP	336	now = ktime_to_ns(ktime_get());
	337	toks = min_t(s64, now - police->tcfp_t_c,
	338	police->tcfp_burst);
	339	if (police->peak_present) {
e9ce1cd3	340	ptoks = toks + police->tcfp_ptoks;
c6d14ff1 JP	341	if (ptoks > police->tcfp_mtu_ptoks)
	342	ptoks = police->tcfp_mtu_ptoks;
	343	ptoks -= (s64) psched_l2t_ns(&police->peak,
	344	qdisc_pkt_len(skb));
1da177e4	345	}
e9ce1cd3	346	toks += police->tcfp_toks;
c6d14ff1	347	if (toks > police->tcfp_burst)
e9ce1cd3	348	toks = police->tcfp_burst;
c6d14ff1	349	toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb));
1da177e4	350	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	351	police->tcfp_t_c = now;
	352	police->tcfp_toks = toks;
	353	police->tcfp_ptoks = ptoks;
	354	spin_unlock(&police->tcf_lock);
	355	return police->tcfp_result;
1da177e4 LT	356	}
	357	}
	358
e9ce1cd3	359	police->tcf_qstats.overlimits++;
b9647580 JP	360	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	361	police->tcf_qstats.drops++;
e9ce1cd3 DM	362	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	363	return police->tcf_action;
1da177e4 LT	364	}
	365
	366	static int
	367	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	368	{
27a884dc	369	unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3	370	struct tcf_police *police = a->priv;
0f04cfd0 JM	371	struct tc_police opt = {
	372	.index = police->tcf_index,
	373	.action = police->tcf_action,
	374	.mtu = police->tcfp_mtu,
c6d14ff1	375	.burst = PSCHED_NS2TICKS(police->tcfp_burst),
0f04cfd0 JM	376	.refcnt = police->tcf_refcnt - ref,
	377	.bindcnt = police->tcf_bindcnt - bind,
	378	};
	379
c6d14ff1	380	if (police->rate_present)
01cb71d2	381	psched_ratecfg_getrate(&opt.rate, &police->rate);
c6d14ff1	382	if (police->peak_present)
01cb71d2	383	psched_ratecfg_getrate(&opt.peakrate, &police->peak);
1b34ec43 DM	384	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
	385	goto nla_put_failure;
	386	if (police->tcfp_result &&
	387	nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
	388	goto nla_put_failure;
	389	if (police->tcfp_ewma_rate &&
	390	nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
	391	goto nla_put_failure;
1da177e4 LT	392	return skb->len;
1da177e4 LT	393
7ba699c6	394	nla_put_failure:
dc5fc579	395	nlmsg_trim(skb, b);
1da177e4 LT	396	return -1;
	397	}
	398
	399	MODULE_AUTHOR("Alexey Kuznetsov");
	400	MODULE_DESCRIPTION("Policing actions");
	401	MODULE_LICENSE("GPL");
	402
	403	static struct tc_action_ops act_police_ops = {
	404	.kind = "police",
e9ce1cd3	405	.hinfo = &police_hash_info,
1da177e4 LT	406	.type = TCA_ID_POLICE,
	407	.capab = TCA_CAP_NONE,
	408	.owner = THIS_MODULE,
	409	.act = tcf_act_police,
	410	.dump = tcf_act_police_dump,
	411	.cleanup = tcf_act_police_cleanup,
1da177e4	412	.init = tcf_act_police_locate,
83b950c8	413	.walk = tcf_act_police_walker
1da177e4 LT	414	};
	415
	416	static int __init
	417	police_init_module(void)
	418	{
	419	return tcf_register_action(&act_police_ops);
	420	}
	421
	422	static void __exit
	423	police_cleanup_module(void)
	424	{
	425	tcf_unregister_action(&act_police_ops);
	426	}
	427
	428	module_init(police_init_module);
	429	module_exit(police_cleanup_module);