[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 <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 *r;

	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;
			r = (struct nlattr *)skb_tail_pointer(skb);
			NLA_PUT(skb, a->order, 0, NULL);
			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--;
				nlmsg_trim(skb, r);
				goto done;
			}
			r->nla_len = skb_tail_pointer(skb) - (u8 *)r;
			n_i++;
		}
	}
done:
	read_unlock_bh(&police_lock);
	if (n_i)
		cb->args[0] += n_i;
	return n_i;

nla_put_failure:
	nlmsg_trim(skb, r);
	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;
		}
	}
	BUG_TRAP(0);
}

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, 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]);

	if (tb[TCA_POLICE_RESULT] != NULL &&
	    nla_len(tb[TCA_POLICE_RESULT]) != sizeof(u32))
		return -EINVAL;
	if (tb[TCA_POLICE_RESULT] != NULL &&
	    nla_len(tb[TCA_POLICE_RESULT]) != sizeof(u32))
		return -EINVAL;

	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) {
				qdisc_put_rtab(R_tab);
				goto failure;
			}
		}
	}
	/* No failure allowed after this point */
	spin_lock_bh(&police->tcf_lock);
	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 = *(u32*)nla_data(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 =
			*(u32*)nla_data(tb[TCA_POLICE_AVRATE]);
	if (est)
		gen_replace_estimator(&police->tcf_bstats,
				      &police->tcf_rate_est,
				      &police->tcf_lock, est);

	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:
	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 += skb->len;
	police->tcf_bstats.packets++;

	if (police->tcfp_ewma_rate &&
	    police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
		police->tcf_qstats.overlimits++;
		spin_unlock(&police->tcf_lock);
		return police->tcf_action;
	}

	if (skb->len <= 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, skb->len);
		}
		toks += police->tcfp_toks;
		if (toks > (long)police->tcfp_burst)
			toks = police->tcfp_burst;
		toks -= L2T(police, skb->len);
		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++;
	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(skb, TCA_POLICE_RESULT, sizeof(int),
			&police->tcfp_result);
	if (police->tcfp_ewma_rate)
		NLA_PUT(skb, TCA_POLICE_AVRATE, 4, &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>
1da177e4	21	#include <net/act_api.h>
dc5fc579	22	#include <net/netlink.h>
1da177e4	23
e9bef55d JDB	24	#define L2T(p,L) qdisc_l2t((p)->tcfp_R_tab, L)
e9bef55d JDB	25	#define L2T_P(p,L) qdisc_l2t((p)->tcfp_P_tab, L)
1da177e4	26
e9ce1cd3 DM	27	#define POL_TAB_MASK 15
	28	static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1];
	29	static u32 police_idx_gen;
	30	static DEFINE_RWLOCK(police_lock);
1da177e4	31
e9ce1cd3 DM	32	static struct tcf_hashinfo police_hash_info = {
	33	.htab = tcf_police_ht,
	34	.hmask = POL_TAB_MASK,
	35	.lock = &police_lock,
	36	};
1da177e4	37
1e9b3d53 PM	38	/* old policer structure from before tc actions */
	39	struct tc_police_compat
	40	{
	41	u32 index;
	42	int action;
	43	u32 limit;
	44	u32 burst;
	45	u32 mtu;
	46	struct tc_ratespec rate;
	47	struct tc_ratespec peakrate;
	48	};
	49
e9ce1cd3	50	/* Each policer is serialized by its individual spinlock */
1da177e4	51
83b950c8	52	static int tcf_act_police_walker(struct sk_buff skb, struct netlink_callback cb,
10297b99	53	int type, struct tc_action *a)
1da177e4	54	{
e9ce1cd3	55	struct tcf_common *p;
1da177e4	56	int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
7ba699c6	57	struct nlattr *r;
1da177e4	58
e1e992e5	59	read_lock_bh(&police_lock);
1da177e4 LT	60
	61	s_i = cb->args[0];
	62
e9ce1cd3 DM	63	for (i = 0; i < (POL_TAB_MASK + 1); i++) {
e9ce1cd3 DM	64	p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)];
1da177e4	65
e9ce1cd3	66	for (; p; p = p->tcfc_next) {
1da177e4 LT	67	index++;
	68	if (index < s_i)
	69	continue;
	70	a->priv = p;
	71	a->order = index;
7ba699c6 PM	72	r = (struct nlattr *)skb_tail_pointer(skb);
7ba699c6 PM	73	NLA_PUT(skb, a->order, 0, NULL);
1da177e4 LT	74	if (type == RTM_DELACTION)
	75	err = tcf_action_dump_1(skb, a, 0, 1);
	76	else
	77	err = tcf_action_dump_1(skb, a, 0, 0);
	78	if (err < 0) {
	79	index--;
dc5fc579	80	nlmsg_trim(skb, r);
1da177e4 LT	81	goto done;
1da177e4 LT	82	}
7ba699c6	83	r->nla_len = skb_tail_pointer(skb) - (u8 *)r;
1da177e4 LT	84	n_i++;
	85	}
	86	}
	87	done:
e1e992e5	88	read_unlock_bh(&police_lock);
1da177e4 LT	89	if (n_i)
	90	cb->args[0] += n_i;
	91	return n_i;
	92
7ba699c6	93	nla_put_failure:
dc5fc579	94	nlmsg_trim(skb, r);
1da177e4 LT	95	goto done;
1da177e4 LT	96	}
1da177e4	97
c3bc7cff	98	static void tcf_police_destroy(struct tcf_police *p)
1da177e4	99	{
e9ce1cd3 DM	100	unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
e9ce1cd3 DM	101	struct tcf_common **p1p;
10297b99	102
e9ce1cd3 DM	103	for (p1p = &tcf_police_ht[h]; p1p; p1p = &(p1p)->tcfc_next) {
e9ce1cd3 DM	104	if (*p1p == &p->common) {
1da177e4	105	write_lock_bh(&police_lock);
e9ce1cd3	106	*p1p = p->tcf_next;
1da177e4	107	write_unlock_bh(&police_lock);
e9ce1cd3 DM	108	gen_kill_estimator(&p->tcf_bstats,
e9ce1cd3 DM	109	&p->tcf_rate_est);
e9ce1cd3 DM	110	if (p->tcfp_R_tab)
	111	qdisc_put_rtab(p->tcfp_R_tab);
	112	if (p->tcfp_P_tab)
	113	qdisc_put_rtab(p->tcfp_P_tab);
1da177e4 LT	114	kfree(p);
	115	return;
	116	}
	117	}
	118	BUG_TRAP(0);
	119	}
	120
7ba699c6	121	static int tcf_act_police_locate(struct nlattr nla, struct nlattr est,
10297b99	122	struct tc_action *a, int ovr, int bind)
1da177e4 LT	123	{
	124	unsigned h;
	125	int ret = 0, err;
7ba699c6	126	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	127	struct tc_police *parm;
e9ce1cd3	128	struct tcf_police *police;
1da177e4	129	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
1e9b3d53	130	int size;
1da177e4	131
cee63723	132	if (nla == NULL)
1da177e4 LT	133	return -EINVAL;
1da177e4 LT	134
cee63723 PM	135	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, NULL);
	136	if (err < 0)
	137	return err;
	138
7ba699c6	139	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	140	return -EINVAL;
7ba699c6	141	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	142	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	143	return -EINVAL;
7ba699c6	144	parm = nla_data(tb[TCA_POLICE_TBF]);
1da177e4	145
7ba699c6 PM	146	if (tb[TCA_POLICE_RESULT] != NULL &&
7ba699c6 PM	147	nla_len(tb[TCA_POLICE_RESULT]) != sizeof(u32))
1da177e4	148	return -EINVAL;
7ba699c6 PM	149	if (tb[TCA_POLICE_RESULT] != NULL &&
7ba699c6 PM	150	nla_len(tb[TCA_POLICE_RESULT]) != sizeof(u32))
1da177e4 LT	151	return -EINVAL;
1da177e4 LT	152
e9ce1cd3 DM	153	if (parm->index) {
	154	struct tcf_common *pc;
	155
	156	pc = tcf_hash_lookup(parm->index, &police_hash_info);
	157	if (pc != NULL) {
	158	a->priv = pc;
	159	police = to_police(pc);
	160	if (bind) {
	161	police->tcf_bindcnt += 1;
	162	police->tcf_refcnt += 1;
	163	}
	164	if (ovr)
	165	goto override;
	166	return ret;
1da177e4	167	}
1da177e4 LT	168	}
1da177e4 LT	169
e9ce1cd3 DM	170	police = kzalloc(sizeof(*police), GFP_KERNEL);
e9ce1cd3 DM	171	if (police == NULL)
1da177e4	172	return -ENOMEM;
1da177e4	173	ret = ACT_P_CREATED;
e9ce1cd3 DM	174	police->tcf_refcnt = 1;
e9ce1cd3 DM	175	spin_lock_init(&police->tcf_lock);
1da177e4	176	if (bind)
e9ce1cd3	177	police->tcf_bindcnt = 1;
1da177e4 LT	178	override:
	179	if (parm->rate.rate) {
	180	err = -ENOMEM;
7ba699c6	181	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
1da177e4 LT	182	if (R_tab == NULL)
	183	goto failure;
	184	if (parm->peakrate.rate) {
	185	P_tab = qdisc_get_rtab(&parm->peakrate,
7ba699c6	186	tb[TCA_POLICE_PEAKRATE]);
e9ce1cd3	187	if (P_tab == NULL) {
1da177e4 LT	188	qdisc_put_rtab(R_tab);
	189	goto failure;
	190	}
	191	}
	192	}
	193	/* No failure allowed after this point */
e9ce1cd3	194	spin_lock_bh(&police->tcf_lock);
1da177e4	195	if (R_tab != NULL) {
e9ce1cd3 DM	196	qdisc_put_rtab(police->tcfp_R_tab);
e9ce1cd3 DM	197	police->tcfp_R_tab = R_tab;
1da177e4 LT	198	}
1da177e4 LT	199	if (P_tab != NULL) {
e9ce1cd3 DM	200	qdisc_put_rtab(police->tcfp_P_tab);
e9ce1cd3 DM	201	police->tcfp_P_tab = P_tab;
1da177e4 LT	202	}
1da177e4 LT	203
7ba699c6 PM	204	if (tb[TCA_POLICE_RESULT])
7ba699c6 PM	205	police->tcfp_result = (u32)nla_data(tb[TCA_POLICE_RESULT]);
e9ce1cd3 DM	206	police->tcfp_toks = police->tcfp_burst = parm->burst;
	207	police->tcfp_mtu = parm->mtu;
	208	if (police->tcfp_mtu == 0) {
	209	police->tcfp_mtu = ~0;
	210	if (police->tcfp_R_tab)
	211	police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
1da177e4	212	}
e9ce1cd3 DM	213	if (police->tcfp_P_tab)
	214	police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
	215	police->tcf_action = parm->action;
1da177e4	216
7ba699c6	217	if (tb[TCA_POLICE_AVRATE])
e9ce1cd3	218	police->tcfp_ewma_rate =
7ba699c6	219	(u32)nla_data(tb[TCA_POLICE_AVRATE]);
1da177e4	220	if (est)
e9ce1cd3 DM	221	gen_replace_estimator(&police->tcf_bstats,
e9ce1cd3 DM	222	&police->tcf_rate_est,
7ba699c6	223	&police->tcf_lock, est);
1da177e4	224
e9ce1cd3	225	spin_unlock_bh(&police->tcf_lock);
1da177e4 LT	226	if (ret != ACT_P_CREATED)
	227	return ret;
	228
3bebcda2	229	police->tcfp_t_c = psched_get_time();
e9ce1cd3 DM	230	police->tcf_index = parm->index ? parm->index :
	231	tcf_hash_new_index(&police_idx_gen, &police_hash_info);
	232	h = tcf_hash(police->tcf_index, POL_TAB_MASK);
1da177e4	233	write_lock_bh(&police_lock);
e9ce1cd3 DM	234	police->tcf_next = tcf_police_ht[h];
e9ce1cd3 DM	235	tcf_police_ht[h] = &police->common;
1da177e4 LT	236	write_unlock_bh(&police_lock);
1da177e4 LT	237
e9ce1cd3	238	a->priv = police;
1da177e4 LT	239	return ret;
	240
	241	failure:
	242	if (ret == ACT_P_CREATED)
e9ce1cd3	243	kfree(police);
1da177e4 LT	244	return err;
	245	}
	246
	247	static int tcf_act_police_cleanup(struct tc_action *a, int bind)
	248	{
e9ce1cd3	249	struct tcf_police *p = a->priv;
c3bc7cff	250	int ret = 0;
1da177e4	251
c3bc7cff PM	252	if (p != NULL) {
	253	if (bind)
	254	p->tcf_bindcnt--;
	255
	256	p->tcf_refcnt--;
	257	if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) {
	258	tcf_police_destroy(p);
	259	ret = 1;
	260	}
	261	}
	262	return ret;
1da177e4 LT	263	}
1da177e4 LT	264
f43c5a0d	265	static int tcf_act_police(struct sk_buff skb, struct tc_action a,
10297b99	266	struct tcf_result *res)
1da177e4	267	{
e9ce1cd3	268	struct tcf_police *police = a->priv;
1da177e4	269	psched_time_t now;
1da177e4 LT	270	long toks;
	271	long ptoks = 0;
	272
e9ce1cd3	273	spin_lock(&police->tcf_lock);
1da177e4	274
e9ce1cd3 DM	275	police->tcf_bstats.bytes += skb->len;
e9ce1cd3 DM	276	police->tcf_bstats.packets++;
1da177e4	277
e9ce1cd3 DM	278	if (police->tcfp_ewma_rate &&
	279	police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
	280	police->tcf_qstats.overlimits++;
	281	spin_unlock(&police->tcf_lock);
	282	return police->tcf_action;
1da177e4	283	}
1da177e4	284
e9ce1cd3 DM	285	if (skb->len <= police->tcfp_mtu) {
	286	if (police->tcfp_R_tab == NULL) {
	287	spin_unlock(&police->tcf_lock);
	288	return police->tcfp_result;
1da177e4 LT	289	}
1da177e4 LT	290
3bebcda2	291	now = psched_get_time();
03cc45c0 PM	292	toks = psched_tdiff_bounded(now, police->tcfp_t_c,
03cc45c0 PM	293	police->tcfp_burst);
e9ce1cd3 DM	294	if (police->tcfp_P_tab) {
	295	ptoks = toks + police->tcfp_ptoks;
	296	if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
	297	ptoks = (long)L2T_P(police, police->tcfp_mtu);
	298	ptoks -= L2T_P(police, skb->len);
1da177e4	299	}
e9ce1cd3 DM	300	toks += police->tcfp_toks;
	301	if (toks > (long)police->tcfp_burst)
	302	toks = police->tcfp_burst;
	303	toks -= L2T(police, skb->len);
1da177e4	304	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	305	police->tcfp_t_c = now;
	306	police->tcfp_toks = toks;
	307	police->tcfp_ptoks = ptoks;
	308	spin_unlock(&police->tcf_lock);
	309	return police->tcfp_result;
1da177e4 LT	310	}
	311	}
	312
e9ce1cd3 DM	313	police->tcf_qstats.overlimits++;
	314	spin_unlock(&police->tcf_lock);
	315	return police->tcf_action;
1da177e4 LT	316	}
	317
	318	static int
	319	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	320	{
27a884dc	321	unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3	322	struct tcf_police *police = a->priv;
1da177e4	323	struct tc_police opt;
e9ce1cd3 DM	324
	325	opt.index = police->tcf_index;
	326	opt.action = police->tcf_action;
	327	opt.mtu = police->tcfp_mtu;
	328	opt.burst = police->tcfp_burst;
	329	opt.refcnt = police->tcf_refcnt - ref;
	330	opt.bindcnt = police->tcf_bindcnt - bind;
	331	if (police->tcfp_R_tab)
	332	opt.rate = police->tcfp_R_tab->rate;
1da177e4 LT	333	else
1da177e4 LT	334	memset(&opt.rate, 0, sizeof(opt.rate));
e9ce1cd3 DM	335	if (police->tcfp_P_tab)
e9ce1cd3 DM	336	opt.peakrate = police->tcfp_P_tab->rate;
1da177e4 LT	337	else
1da177e4 LT	338	memset(&opt.peakrate, 0, sizeof(opt.peakrate));
7ba699c6	339	NLA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
e9ce1cd3	340	if (police->tcfp_result)
7ba699c6	341	NLA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
e9ce1cd3	342	&police->tcfp_result);
e9ce1cd3	343	if (police->tcfp_ewma_rate)
7ba699c6	344	NLA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
1da177e4 LT	345	return skb->len;
1da177e4 LT	346
7ba699c6	347	nla_put_failure:
dc5fc579	348	nlmsg_trim(skb, b);
1da177e4 LT	349	return -1;
	350	}
	351
	352	MODULE_AUTHOR("Alexey Kuznetsov");
	353	MODULE_DESCRIPTION("Policing actions");
	354	MODULE_LICENSE("GPL");
	355
	356	static struct tc_action_ops act_police_ops = {
	357	.kind = "police",
e9ce1cd3	358	.hinfo = &police_hash_info,
1da177e4 LT	359	.type = TCA_ID_POLICE,
	360	.capab = TCA_CAP_NONE,
	361	.owner = THIS_MODULE,
	362	.act = tcf_act_police,
	363	.dump = tcf_act_police_dump,
	364	.cleanup = tcf_act_police_cleanup,
e9ce1cd3	365	.lookup = tcf_hash_search,
1da177e4	366	.init = tcf_act_police_locate,
83b950c8	367	.walk = tcf_act_police_walker
1da177e4 LT	368	};
	369
	370	static int __init
	371	police_init_module(void)
	372	{
	373	return tcf_register_action(&act_police_ops);
	374	}
	375
	376	static void __exit
	377	police_cleanup_module(void)
	378	{
	379	tcf_unregister_action(&act_police_ops);
	380	}
	381
	382	module_init(police_init_module);
	383	module_exit(police_cleanup_module);