[mirror_ubuntu-bionic-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>

#define L2T(p,L)   qdisc_l2t((p)->tcfp_R_tab, L)
#define L2T_P(p,L) qdisc_l2t((p)->tcfp_P_tab, L)

#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);
			if (p->tcfp_R_tab)
				qdisc_put_rtab(p->tcfp_R_tab);
			if (p->tcfp_P_tab)
				qdisc_put_rtab(p->tcfp_P_tab);
			kfree(p);
			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 nlattr *nla, struct nlattr *est,
				 struct tc_action *a, int ovr, int bind)
{
	unsigned 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;
			}
			if (ovr)
				goto override;
			return ret;
		}
	}

	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 */
	if (R_tab != NULL) {
		qdisc_put_rtab(police->tcfp_R_tab);
		police->tcfp_R_tab = R_tab;
	}
	if (P_tab != NULL) {
		qdisc_put_rtab(police->tcfp_P_tab);
		police->tcfp_P_tab = P_tab;
	}

	if (tb[TCA_POLICE_RESULT])
		police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
	police->tcfp_toks = police->tcfp_burst = parm->burst;
	police->tcfp_mtu = parm->mtu;
	if (police->tcfp_mtu == 0) {
		police->tcfp_mtu = ~0;
		if (police->tcfp_R_tab)
			police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
	}
	if (police->tcfp_P_tab)
		police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
	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 = psched_get_time();
	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, struct tc_action *a,
			  struct tcf_result *res)
{
	struct tcf_police *police = a->priv;
	psched_time_t now;
	long toks;
	long ptoks = 0;

	spin_lock(&police->tcf_lock);

	police->tcf_bstats.bytes += qdisc_pkt_len(skb);
	police->tcf_bstats.packets++;

	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->tcfp_R_tab == NULL) {
			spin_unlock(&police->tcf_lock);
			return police->tcfp_result;
		}

		now = psched_get_time();
		toks = psched_tdiff_bounded(now, police->tcfp_t_c,
					    police->tcfp_burst);
		if (police->tcfp_P_tab) {
			ptoks = toks + police->tcfp_ptoks;
			if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
				ptoks = (long)L2T_P(police, police->tcfp_mtu);
			ptoks -= L2T_P(police, qdisc_pkt_len(skb));
		}
		toks += police->tcfp_toks;
		if (toks > (long)police->tcfp_burst)
			toks = police->tcfp_burst;
		toks -= L2T(police, 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;

	opt.index = police->tcf_index;
	opt.action = police->tcf_action;
	opt.mtu = police->tcfp_mtu;
	opt.burst = police->tcfp_burst;
	opt.refcnt = police->tcf_refcnt - ref;
	opt.bindcnt = police->tcf_bindcnt - bind;
	if (police->tcfp_R_tab)
		opt.rate = police->tcfp_R_tab->rate;
	else
		memset(&opt.rate, 0, sizeof(opt.rate));
	if (police->tcfp_P_tab)
		opt.peakrate = police->tcfp_P_tab->rate;
	else
		memset(&opt.peakrate, 0, sizeof(opt.peakrate));
	NLA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
	if (police->tcfp_result)
		NLA_PUT_U32(skb, TCA_POLICE_RESULT, police->tcfp_result);
	if (police->tcfp_ewma_rate)
		NLA_PUT_U32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate);
	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,
	.lookup		=	tcf_hash_search,
	.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
e9bef55d JDB	25	#define L2T(p,L) qdisc_l2t((p)->tcfp_R_tab, L)
e9bef55d JDB	26	#define L2T_P(p,L) qdisc_l2t((p)->tcfp_P_tab, L)
1da177e4	27
e9ce1cd3 DM	28	#define POL_TAB_MASK 15
	29	static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1];
	30	static u32 police_idx_gen;
	31	static DEFINE_RWLOCK(police_lock);
1da177e4	32
e9ce1cd3 DM	33	static struct tcf_hashinfo police_hash_info = {
	34	.htab = tcf_police_ht,
	35	.hmask = POL_TAB_MASK,
	36	.lock = &police_lock,
	37	};
1da177e4	38
1e9b3d53 PM	39	/* old policer structure from before tc actions */
	40	struct tc_police_compat
	41	{
	42	u32 index;
	43	int action;
	44	u32 limit;
	45	u32 burst;
	46	u32 mtu;
	47	struct tc_ratespec rate;
	48	struct tc_ratespec peakrate;
	49	};
	50
e9ce1cd3	51	/* Each policer is serialized by its individual spinlock */
1da177e4	52
83b950c8	53	static int tcf_act_police_walker(struct sk_buff skb, struct netlink_callback cb,
10297b99	54	int type, struct tc_action *a)
1da177e4	55	{
e9ce1cd3	56	struct tcf_common *p;
1da177e4	57	int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
4b3550ef	58	struct nlattr *nest;
1da177e4	59
e1e992e5	60	read_lock_bh(&police_lock);
1da177e4 LT	61
	62	s_i = cb->args[0];
	63
e9ce1cd3 DM	64	for (i = 0; i < (POL_TAB_MASK + 1); i++) {
e9ce1cd3 DM	65	p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)];
1da177e4	66
e9ce1cd3	67	for (; p; p = p->tcfc_next) {
1da177e4 LT	68	index++;
	69	if (index < s_i)
	70	continue;
	71	a->priv = p;
	72	a->order = index;
4b3550ef PM	73	nest = nla_nest_start(skb, a->order);
	74	if (nest == NULL)
	75	goto nla_put_failure;
1da177e4 LT	76	if (type == RTM_DELACTION)
	77	err = tcf_action_dump_1(skb, a, 0, 1);
	78	else
	79	err = tcf_action_dump_1(skb, a, 0, 0);
	80	if (err < 0) {
	81	index--;
4b3550ef	82	nla_nest_cancel(skb, nest);
1da177e4 LT	83	goto done;
1da177e4 LT	84	}
4b3550ef	85	nla_nest_end(skb, nest);
1da177e4 LT	86	n_i++;
	87	}
	88	}
	89	done:
e1e992e5	90	read_unlock_bh(&police_lock);
1da177e4 LT	91	if (n_i)
	92	cb->args[0] += n_i;
	93	return n_i;
	94
7ba699c6	95	nla_put_failure:
4b3550ef	96	nla_nest_cancel(skb, nest);
1da177e4 LT	97	goto done;
1da177e4 LT	98	}
1da177e4	99
c3bc7cff	100	static void tcf_police_destroy(struct tcf_police *p)
1da177e4	101	{
e9ce1cd3 DM	102	unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
e9ce1cd3 DM	103	struct tcf_common **p1p;
10297b99	104
e9ce1cd3 DM	105	for (p1p = &tcf_police_ht[h]; p1p; p1p = &(p1p)->tcfc_next) {
e9ce1cd3 DM	106	if (*p1p == &p->common) {
1da177e4	107	write_lock_bh(&police_lock);
e9ce1cd3	108	*p1p = p->tcf_next;
1da177e4	109	write_unlock_bh(&police_lock);
e9ce1cd3 DM	110	gen_kill_estimator(&p->tcf_bstats,
e9ce1cd3 DM	111	&p->tcf_rate_est);
e9ce1cd3 DM	112	if (p->tcfp_R_tab)
	113	qdisc_put_rtab(p->tcfp_R_tab);
	114	if (p->tcfp_P_tab)
	115	qdisc_put_rtab(p->tcfp_P_tab);
1da177e4 LT	116	kfree(p);
	117	return;
	118	}
	119	}
547b792c	120	WARN_ON(1);
1da177e4 LT	121	}
1da177e4 LT	122
53b2bf3f PM	123	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	124	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	125	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	126	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	127	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	128	};
	129
7ba699c6	130	static int tcf_act_police_locate(struct nlattr nla, struct nlattr est,
10297b99	131	struct tc_action *a, int ovr, int bind)
1da177e4 LT	132	{
	133	unsigned h;
	134	int ret = 0, err;
7ba699c6	135	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	136	struct tc_police *parm;
e9ce1cd3	137	struct tcf_police *police;
1da177e4	138	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
1e9b3d53	139	int size;
1da177e4	140
cee63723	141	if (nla == NULL)
1da177e4 LT	142	return -EINVAL;
1da177e4 LT	143
53b2bf3f	144	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
cee63723 PM	145	if (err < 0)
	146	return err;
	147
7ba699c6	148	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	149	return -EINVAL;
7ba699c6	150	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	151	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	152	return -EINVAL;
7ba699c6	153	parm = nla_data(tb[TCA_POLICE_TBF]);
1da177e4	154
e9ce1cd3 DM	155	if (parm->index) {
	156	struct tcf_common *pc;
	157
	158	pc = tcf_hash_lookup(parm->index, &police_hash_info);
	159	if (pc != NULL) {
	160	a->priv = pc;
	161	police = to_police(pc);
	162	if (bind) {
	163	police->tcf_bindcnt += 1;
	164	police->tcf_refcnt += 1;
	165	}
	166	if (ovr)
	167	goto override;
	168	return ret;
1da177e4	169	}
1da177e4 LT	170	}
1da177e4 LT	171
e9ce1cd3 DM	172	police = kzalloc(sizeof(*police), GFP_KERNEL);
e9ce1cd3 DM	173	if (police == NULL)
1da177e4	174	return -ENOMEM;
1da177e4	175	ret = ACT_P_CREATED;
e9ce1cd3 DM	176	police->tcf_refcnt = 1;
e9ce1cd3 DM	177	spin_lock_init(&police->tcf_lock);
1da177e4	178	if (bind)
e9ce1cd3	179	police->tcf_bindcnt = 1;
1da177e4 LT	180	override:
	181	if (parm->rate.rate) {
	182	err = -ENOMEM;
7ba699c6	183	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
1da177e4 LT	184	if (R_tab == NULL)
1da177e4 LT	185	goto failure;
c1b56878	186
1da177e4 LT	187	if (parm->peakrate.rate) {
1da177e4 LT	188	P_tab = qdisc_get_rtab(&parm->peakrate,
7ba699c6	189	tb[TCA_POLICE_PEAKRATE]);
71bcb09a	190	if (P_tab == NULL)
1da177e4	191	goto failure;
1da177e4 LT	192	}
1da177e4 LT	193	}
71bcb09a	194
e9ce1cd3	195	spin_lock_bh(&police->tcf_lock);
71bcb09a SH	196	if (est) {
	197	err = gen_replace_estimator(&police->tcf_bstats,
	198	&police->tcf_rate_est,
	199	&police->tcf_lock, est);
	200	if (err)
	201	goto failure_unlock;
a883bf56 JP	202	} else if (tb[TCA_POLICE_AVRATE] &&
	203	(ret == ACT_P_CREATED \|\|
	204	!gen_estimator_active(&police->tcf_bstats,
	205	&police->tcf_rate_est))) {
	206	err = -EINVAL;
	207	goto failure_unlock;
71bcb09a SH	208	}
	209
	210	/* No failure allowed after this point */
1da177e4	211	if (R_tab != NULL) {
e9ce1cd3 DM	212	qdisc_put_rtab(police->tcfp_R_tab);
e9ce1cd3 DM	213	police->tcfp_R_tab = R_tab;
1da177e4 LT	214	}
1da177e4 LT	215	if (P_tab != NULL) {
e9ce1cd3 DM	216	qdisc_put_rtab(police->tcfp_P_tab);
e9ce1cd3 DM	217	police->tcfp_P_tab = P_tab;
1da177e4 LT	218	}
1da177e4 LT	219
7ba699c6	220	if (tb[TCA_POLICE_RESULT])
1587bac4	221	police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
e9ce1cd3 DM	222	police->tcfp_toks = police->tcfp_burst = parm->burst;
	223	police->tcfp_mtu = parm->mtu;
	224	if (police->tcfp_mtu == 0) {
	225	police->tcfp_mtu = ~0;
	226	if (police->tcfp_R_tab)
	227	police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
1da177e4	228	}
e9ce1cd3 DM	229	if (police->tcfp_P_tab)
	230	police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
	231	police->tcf_action = parm->action;
1da177e4	232
7ba699c6	233	if (tb[TCA_POLICE_AVRATE])
1587bac4	234	police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	235
e9ce1cd3	236	spin_unlock_bh(&police->tcf_lock);
1da177e4 LT	237	if (ret != ACT_P_CREATED)
	238	return ret;
	239
3bebcda2	240	police->tcfp_t_c = psched_get_time();
e9ce1cd3 DM	241	police->tcf_index = parm->index ? parm->index :
	242	tcf_hash_new_index(&police_idx_gen, &police_hash_info);
	243	h = tcf_hash(police->tcf_index, POL_TAB_MASK);
1da177e4	244	write_lock_bh(&police_lock);
e9ce1cd3 DM	245	police->tcf_next = tcf_police_ht[h];
e9ce1cd3 DM	246	tcf_police_ht[h] = &police->common;
1da177e4 LT	247	write_unlock_bh(&police_lock);
1da177e4 LT	248
e9ce1cd3	249	a->priv = police;
1da177e4 LT	250	return ret;
1da177e4 LT	251
71bcb09a SH	252	failure_unlock:
71bcb09a SH	253	spin_unlock_bh(&police->tcf_lock);
1da177e4	254	failure:
71bcb09a SH	255	if (P_tab)
	256	qdisc_put_rtab(P_tab);
	257	if (R_tab)
	258	qdisc_put_rtab(R_tab);
1da177e4	259	if (ret == ACT_P_CREATED)
e9ce1cd3	260	kfree(police);
1da177e4 LT	261	return err;
	262	}
	263
	264	static int tcf_act_police_cleanup(struct tc_action *a, int bind)
	265	{
e9ce1cd3	266	struct tcf_police *p = a->priv;
c3bc7cff	267	int ret = 0;
1da177e4	268
c3bc7cff PM	269	if (p != NULL) {
	270	if (bind)
	271	p->tcf_bindcnt--;
	272
	273	p->tcf_refcnt--;
	274	if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) {
	275	tcf_police_destroy(p);
	276	ret = 1;
	277	}
	278	}
	279	return ret;
1da177e4 LT	280	}
1da177e4 LT	281
f43c5a0d	282	static int tcf_act_police(struct sk_buff skb, struct tc_action a,
10297b99	283	struct tcf_result *res)
1da177e4	284	{
e9ce1cd3	285	struct tcf_police *police = a->priv;
1da177e4	286	psched_time_t now;
1da177e4 LT	287	long toks;
	288	long ptoks = 0;
	289
e9ce1cd3	290	spin_lock(&police->tcf_lock);
1da177e4	291
0abf77e5	292	police->tcf_bstats.bytes += qdisc_pkt_len(skb);
e9ce1cd3	293	police->tcf_bstats.packets++;
1da177e4	294
e9ce1cd3 DM	295	if (police->tcfp_ewma_rate &&
	296	police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
	297	police->tcf_qstats.overlimits++;
b9647580 JP	298	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	299	police->tcf_qstats.drops++;
e9ce1cd3 DM	300	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	301	return police->tcf_action;
1da177e4	302	}
1da177e4	303
0abf77e5	304	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
e9ce1cd3 DM	305	if (police->tcfp_R_tab == NULL) {
	306	spin_unlock(&police->tcf_lock);
	307	return police->tcfp_result;
1da177e4 LT	308	}
1da177e4 LT	309
3bebcda2	310	now = psched_get_time();
03cc45c0 PM	311	toks = psched_tdiff_bounded(now, police->tcfp_t_c,
03cc45c0 PM	312	police->tcfp_burst);
e9ce1cd3 DM	313	if (police->tcfp_P_tab) {
	314	ptoks = toks + police->tcfp_ptoks;
	315	if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
	316	ptoks = (long)L2T_P(police, police->tcfp_mtu);
0abf77e5	317	ptoks -= L2T_P(police, qdisc_pkt_len(skb));
1da177e4	318	}
e9ce1cd3 DM	319	toks += police->tcfp_toks;
	320	if (toks > (long)police->tcfp_burst)
	321	toks = police->tcfp_burst;
0abf77e5	322	toks -= L2T(police, qdisc_pkt_len(skb));
1da177e4	323	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	324	police->tcfp_t_c = now;
	325	police->tcfp_toks = toks;
	326	police->tcfp_ptoks = ptoks;
	327	spin_unlock(&police->tcf_lock);
	328	return police->tcfp_result;
1da177e4 LT	329	}
	330	}
	331
e9ce1cd3	332	police->tcf_qstats.overlimits++;
b9647580 JP	333	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	334	police->tcf_qstats.drops++;
e9ce1cd3 DM	335	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	336	return police->tcf_action;
1da177e4 LT	337	}
	338
	339	static int
	340	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	341	{
27a884dc	342	unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3	343	struct tcf_police *police = a->priv;
1da177e4	344	struct tc_police opt;
e9ce1cd3 DM	345
	346	opt.index = police->tcf_index;
	347	opt.action = police->tcf_action;
	348	opt.mtu = police->tcfp_mtu;
	349	opt.burst = police->tcfp_burst;
	350	opt.refcnt = police->tcf_refcnt - ref;
	351	opt.bindcnt = police->tcf_bindcnt - bind;
	352	if (police->tcfp_R_tab)
	353	opt.rate = police->tcfp_R_tab->rate;
1da177e4 LT	354	else
1da177e4 LT	355	memset(&opt.rate, 0, sizeof(opt.rate));
e9ce1cd3 DM	356	if (police->tcfp_P_tab)
e9ce1cd3 DM	357	opt.peakrate = police->tcfp_P_tab->rate;
1da177e4 LT	358	else
1da177e4 LT	359	memset(&opt.peakrate, 0, sizeof(opt.peakrate));
7ba699c6	360	NLA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
e9ce1cd3	361	if (police->tcfp_result)
24beeab5	362	NLA_PUT_U32(skb, TCA_POLICE_RESULT, police->tcfp_result);
e9ce1cd3	363	if (police->tcfp_ewma_rate)
24beeab5	364	NLA_PUT_U32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate);
1da177e4 LT	365	return skb->len;
1da177e4 LT	366
7ba699c6	367	nla_put_failure:
dc5fc579	368	nlmsg_trim(skb, b);
1da177e4 LT	369	return -1;
	370	}
	371
	372	MODULE_AUTHOR("Alexey Kuznetsov");
	373	MODULE_DESCRIPTION("Policing actions");
	374	MODULE_LICENSE("GPL");
	375
	376	static struct tc_action_ops act_police_ops = {
	377	.kind = "police",
e9ce1cd3	378	.hinfo = &police_hash_info,
1da177e4 LT	379	.type = TCA_ID_POLICE,
	380	.capab = TCA_CAP_NONE,
	381	.owner = THIS_MODULE,
	382	.act = tcf_act_police,
	383	.dump = tcf_act_police_dump,
	384	.cleanup = tcf_act_police_cleanup,
e9ce1cd3	385	.lookup = tcf_hash_search,
1da177e4	386	.init = tcf_act_police_locate,
83b950c8	387	.walk = tcf_act_police_walker
1da177e4 LT	388	};
	389
	390	static int __init
	391	police_init_module(void)
	392	{
	393	return tcf_register_action(&act_police_ops);
	394	}
	395
	396	static void __exit
	397	police_cleanup_module(void)
	398	{
	399	tcf_unregister_action(&act_police_ops);
	400	}
	401
	402	module_init(police_init_module);
	403	module_exit(police_cleanup_module);