[linux.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, <[email protected]>
 * 		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);
			/*
			 * 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 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;
			}
			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, const 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);

	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->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 = {
		.index = police->tcf_index,
		.action = police->tcf_action,
		.mtu = police->tcfp_mtu,
		.burst = police->tcfp_burst,
		.refcnt = police->tcf_refcnt - ref,
		.bindcnt = police->tcf_bindcnt - bind,
	};

	if (police->tcfp_R_tab)
		opt.rate = police->tcfp_R_tab->rate;
	if (police->tcfp_P_tab)
		opt.peakrate = police->tcfp_P_tab->rate;
	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,
	.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, <[email protected]>
	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
cc7ec456 ED	25	#define L2T(p, L) qdisc_l2t((p)->tcfp_R_tab, L)
cc7ec456 ED	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	39	/* old policer structure from before tc actions */
cc7ec456	40	struct tc_police_compat {
1e9b3d53 PM	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;
4b3550ef	57	struct nlattr *nest;
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;
4b3550ef PM	72	nest = nla_nest_start(skb, a->order);
	73	if (nest == NULL)
	74	goto nla_put_failure;
1da177e4 LT	75	if (type == RTM_DELACTION)
	76	err = tcf_action_dump_1(skb, a, 0, 1);
	77	else
	78	err = tcf_action_dump_1(skb, a, 0, 0);
	79	if (err < 0) {
	80	index--;
4b3550ef	81	nla_nest_cancel(skb, nest);
1da177e4 LT	82	goto done;
1da177e4 LT	83	}
4b3550ef	84	nla_nest_end(skb, nest);
1da177e4 LT	85	n_i++;
	86	}
	87	}
	88	done:
e1e992e5	89	read_unlock_bh(&police_lock);
1da177e4 LT	90	if (n_i)
	91	cb->args[0] += n_i;
	92	return n_i;
	93
7ba699c6	94	nla_put_failure:
4b3550ef	95	nla_nest_cancel(skb, nest);
1da177e4 LT	96	goto done;
1da177e4 LT	97	}
1da177e4	98
c3bc7cff	99	static void tcf_police_destroy(struct tcf_police *p)
1da177e4	100	{
e9ce1cd3 DM	101	unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
e9ce1cd3 DM	102	struct tcf_common **p1p;
10297b99	103
e9ce1cd3 DM	104	for (p1p = &tcf_police_ht[h]; p1p; p1p = &(p1p)->tcfc_next) {
e9ce1cd3 DM	105	if (*p1p == &p->common) {
1da177e4	106	write_lock_bh(&police_lock);
e9ce1cd3	107	*p1p = p->tcf_next;
1da177e4	108	write_unlock_bh(&police_lock);
e9ce1cd3 DM	109	gen_kill_estimator(&p->tcf_bstats,
e9ce1cd3 DM	110	&p->tcf_rate_est);
e9ce1cd3 DM	111	if (p->tcfp_R_tab)
	112	qdisc_put_rtab(p->tcfp_R_tab);
	113	if (p->tcfp_P_tab)
	114	qdisc_put_rtab(p->tcfp_P_tab);
c7de2cf0 ED	115	/*
	116	* gen_estimator est_timer() might access p->tcf_lock
	117	* or bstats, wait a RCU grace period before freeing p
	118	*/
5957b1ac	119	kfree_rcu(p, tcf_rcu);
1da177e4 LT	120	return;
	121	}
	122	}
547b792c	123	WARN_ON(1);
1da177e4 LT	124	}
1da177e4 LT	125
53b2bf3f PM	126	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	127	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	128	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	129	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	130	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	131	};
	132
7ba699c6	133	static int tcf_act_police_locate(struct nlattr nla, struct nlattr est,
10297b99	134	struct tc_action *a, int ovr, int bind)
1da177e4	135	{
cc7ec456	136	unsigned int h;
1da177e4	137	int ret = 0, err;
7ba699c6	138	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	139	struct tc_police *parm;
e9ce1cd3	140	struct tcf_police *police;
1da177e4	141	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
1e9b3d53	142	int size;
1da177e4	143
cee63723	144	if (nla == NULL)
1da177e4 LT	145	return -EINVAL;
1da177e4 LT	146
53b2bf3f	147	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
cee63723 PM	148	if (err < 0)
	149	return err;
	150
7ba699c6	151	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	152	return -EINVAL;
7ba699c6	153	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	154	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	155	return -EINVAL;
7ba699c6	156	parm = nla_data(tb[TCA_POLICE_TBF]);
1da177e4	157
e9ce1cd3 DM	158	if (parm->index) {
	159	struct tcf_common *pc;
	160
	161	pc = tcf_hash_lookup(parm->index, &police_hash_info);
	162	if (pc != NULL) {
	163	a->priv = pc;
	164	police = to_police(pc);
	165	if (bind) {
	166	police->tcf_bindcnt += 1;
	167	police->tcf_refcnt += 1;
	168	}
	169	if (ovr)
	170	goto override;
	171	return ret;
1da177e4	172	}
1da177e4 LT	173	}
1da177e4 LT	174
e9ce1cd3 DM	175	police = kzalloc(sizeof(*police), GFP_KERNEL);
e9ce1cd3 DM	176	if (police == NULL)
1da177e4	177	return -ENOMEM;
1da177e4	178	ret = ACT_P_CREATED;
e9ce1cd3 DM	179	police->tcf_refcnt = 1;
e9ce1cd3 DM	180	spin_lock_init(&police->tcf_lock);
1da177e4	181	if (bind)
e9ce1cd3	182	police->tcf_bindcnt = 1;
1da177e4 LT	183	override:
	184	if (parm->rate.rate) {
	185	err = -ENOMEM;
7ba699c6	186	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
1da177e4 LT	187	if (R_tab == NULL)
1da177e4 LT	188	goto failure;
c1b56878	189
1da177e4 LT	190	if (parm->peakrate.rate) {
1da177e4 LT	191	P_tab = qdisc_get_rtab(&parm->peakrate,
7ba699c6	192	tb[TCA_POLICE_PEAKRATE]);
71bcb09a	193	if (P_tab == NULL)
1da177e4	194	goto failure;
1da177e4 LT	195	}
1da177e4 LT	196	}
71bcb09a	197
e9ce1cd3	198	spin_lock_bh(&police->tcf_lock);
71bcb09a SH	199	if (est) {
	200	err = gen_replace_estimator(&police->tcf_bstats,
	201	&police->tcf_rate_est,
	202	&police->tcf_lock, est);
	203	if (err)
	204	goto failure_unlock;
a883bf56 JP	205	} else if (tb[TCA_POLICE_AVRATE] &&
	206	(ret == ACT_P_CREATED \|\|
	207	!gen_estimator_active(&police->tcf_bstats,
	208	&police->tcf_rate_est))) {
	209	err = -EINVAL;
	210	goto failure_unlock;
71bcb09a SH	211	}
	212
	213	/* No failure allowed after this point */
1da177e4	214	if (R_tab != NULL) {
e9ce1cd3 DM	215	qdisc_put_rtab(police->tcfp_R_tab);
e9ce1cd3 DM	216	police->tcfp_R_tab = R_tab;
1da177e4 LT	217	}
1da177e4 LT	218	if (P_tab != NULL) {
e9ce1cd3 DM	219	qdisc_put_rtab(police->tcfp_P_tab);
e9ce1cd3 DM	220	police->tcfp_P_tab = P_tab;
1da177e4 LT	221	}
1da177e4 LT	222
7ba699c6	223	if (tb[TCA_POLICE_RESULT])
1587bac4	224	police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
e9ce1cd3 DM	225	police->tcfp_toks = police->tcfp_burst = parm->burst;
	226	police->tcfp_mtu = parm->mtu;
	227	if (police->tcfp_mtu == 0) {
	228	police->tcfp_mtu = ~0;
	229	if (police->tcfp_R_tab)
	230	police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
1da177e4	231	}
e9ce1cd3 DM	232	if (police->tcfp_P_tab)
	233	police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
	234	police->tcf_action = parm->action;
1da177e4	235
7ba699c6	236	if (tb[TCA_POLICE_AVRATE])
1587bac4	237	police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	238
e9ce1cd3	239	spin_unlock_bh(&police->tcf_lock);
1da177e4 LT	240	if (ret != ACT_P_CREATED)
	241	return ret;
	242
3bebcda2	243	police->tcfp_t_c = psched_get_time();
e9ce1cd3 DM	244	police->tcf_index = parm->index ? parm->index :
	245	tcf_hash_new_index(&police_idx_gen, &police_hash_info);
	246	h = tcf_hash(police->tcf_index, POL_TAB_MASK);
1da177e4	247	write_lock_bh(&police_lock);
e9ce1cd3 DM	248	police->tcf_next = tcf_police_ht[h];
e9ce1cd3 DM	249	tcf_police_ht[h] = &police->common;
1da177e4 LT	250	write_unlock_bh(&police_lock);
1da177e4 LT	251
e9ce1cd3	252	a->priv = police;
1da177e4 LT	253	return ret;
1da177e4 LT	254
71bcb09a SH	255	failure_unlock:
71bcb09a SH	256	spin_unlock_bh(&police->tcf_lock);
1da177e4	257	failure:
71bcb09a SH	258	if (P_tab)
	259	qdisc_put_rtab(P_tab);
	260	if (R_tab)
	261	qdisc_put_rtab(R_tab);
1da177e4	262	if (ret == ACT_P_CREATED)
e9ce1cd3	263	kfree(police);
1da177e4 LT	264	return err;
	265	}
	266
	267	static int tcf_act_police_cleanup(struct tc_action *a, int bind)
	268	{
e9ce1cd3	269	struct tcf_police *p = a->priv;
c3bc7cff	270	int ret = 0;
1da177e4	271
c3bc7cff PM	272	if (p != NULL) {
	273	if (bind)
	274	p->tcf_bindcnt--;
	275
	276	p->tcf_refcnt--;
	277	if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) {
	278	tcf_police_destroy(p);
	279	ret = 1;
	280	}
	281	}
	282	return ret;
1da177e4 LT	283	}
1da177e4 LT	284
dc7f9f6e	285	static int tcf_act_police(struct sk_buff skb, const struct tc_action a,
10297b99	286	struct tcf_result *res)
1da177e4	287	{
e9ce1cd3	288	struct tcf_police *police = a->priv;
1da177e4	289	psched_time_t now;
1da177e4 LT	290	long toks;
	291	long ptoks = 0;
	292
e9ce1cd3	293	spin_lock(&police->tcf_lock);
1da177e4	294
bfe0d029	295	bstats_update(&police->tcf_bstats, skb);
1da177e4	296
e9ce1cd3 DM	297	if (police->tcfp_ewma_rate &&
	298	police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
	299	police->tcf_qstats.overlimits++;
b9647580 JP	300	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	301	police->tcf_qstats.drops++;
e9ce1cd3 DM	302	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	303	return police->tcf_action;
1da177e4	304	}
1da177e4	305
0abf77e5	306	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
e9ce1cd3 DM	307	if (police->tcfp_R_tab == NULL) {
	308	spin_unlock(&police->tcf_lock);
	309	return police->tcfp_result;
1da177e4 LT	310	}
1da177e4 LT	311
3bebcda2	312	now = psched_get_time();
03cc45c0 PM	313	toks = psched_tdiff_bounded(now, police->tcfp_t_c,
03cc45c0 PM	314	police->tcfp_burst);
e9ce1cd3 DM	315	if (police->tcfp_P_tab) {
	316	ptoks = toks + police->tcfp_ptoks;
	317	if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
	318	ptoks = (long)L2T_P(police, police->tcfp_mtu);
0abf77e5	319	ptoks -= L2T_P(police, qdisc_pkt_len(skb));
1da177e4	320	}
e9ce1cd3 DM	321	toks += police->tcfp_toks;
	322	if (toks > (long)police->tcfp_burst)
	323	toks = police->tcfp_burst;
0abf77e5	324	toks -= L2T(police, qdisc_pkt_len(skb));
1da177e4	325	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	326	police->tcfp_t_c = now;
	327	police->tcfp_toks = toks;
	328	police->tcfp_ptoks = ptoks;
	329	spin_unlock(&police->tcf_lock);
	330	return police->tcfp_result;
1da177e4 LT	331	}
	332	}
	333
e9ce1cd3	334	police->tcf_qstats.overlimits++;
b9647580 JP	335	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	336	police->tcf_qstats.drops++;
e9ce1cd3 DM	337	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	338	return police->tcf_action;
1da177e4 LT	339	}
	340
	341	static int
	342	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	343	{
27a884dc	344	unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3	345	struct tcf_police *police = a->priv;
0f04cfd0 JM	346	struct tc_police opt = {
	347	.index = police->tcf_index,
	348	.action = police->tcf_action,
	349	.mtu = police->tcfp_mtu,
	350	.burst = police->tcfp_burst,
	351	.refcnt = police->tcf_refcnt - ref,
	352	.bindcnt = police->tcf_bindcnt - bind,
	353	};
	354
e9ce1cd3 DM	355	if (police->tcfp_R_tab)
e9ce1cd3 DM	356	opt.rate = police->tcfp_R_tab->rate;
e9ce1cd3 DM	357	if (police->tcfp_P_tab)
e9ce1cd3 DM	358	opt.peakrate = police->tcfp_P_tab->rate;
1b34ec43 DM	359	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
	360	goto nla_put_failure;
	361	if (police->tcfp_result &&
	362	nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
	363	goto nla_put_failure;
	364	if (police->tcfp_ewma_rate &&
	365	nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
	366	goto nla_put_failure;
1da177e4 LT	367	return skb->len;
1da177e4 LT	368
7ba699c6	369	nla_put_failure:
dc5fc579	370	nlmsg_trim(skb, b);
1da177e4 LT	371	return -1;
	372	}
	373
	374	MODULE_AUTHOR("Alexey Kuznetsov");
	375	MODULE_DESCRIPTION("Policing actions");
	376	MODULE_LICENSE("GPL");
	377
	378	static struct tc_action_ops act_police_ops = {
	379	.kind = "police",
e9ce1cd3	380	.hinfo = &police_hash_info,
1da177e4 LT	381	.type = TCA_ID_POLICE,
	382	.capab = TCA_CAP_NONE,
	383	.owner = THIS_MODULE,
	384	.act = tcf_act_police,
	385	.dump = tcf_act_police_dump,
	386	.cleanup = tcf_act_police_cleanup,
e9ce1cd3	387	.lookup = tcf_hash_search,
1da177e4	388	.init = tcf_act_police_locate,
83b950c8	389	.walk = tcf_act_police_walker
1da177e4 LT	390	};
	391
	392	static int __init
	393	police_init_module(void)
	394	{
	395	return tcf_register_action(&act_police_ops);
	396	}
	397
	398	static void __exit
	399	police_cleanup_module(void)
	400	{
	401	tcf_unregister_action(&act_police_ops);
	402	}
	403
	404	module_init(police_init_module);
	405	module_exit(police_cleanup_module);