[deliverable/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, <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);
			/*
			 * 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;
			}
			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, <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
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
c1b52739 BL	133	static int tcf_act_police_locate(struct net net, struct nlattr nla,
	134	struct nlattr est, struct tc_action a,
	135	int ovr, int bind)
1da177e4	136	{
cc7ec456	137	unsigned int h;
1da177e4	138	int ret = 0, err;
7ba699c6	139	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	140	struct tc_police *parm;
e9ce1cd3	141	struct tcf_police *police;
1da177e4	142	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
1e9b3d53	143	int size;
1da177e4	144
cee63723	145	if (nla == NULL)
1da177e4 LT	146	return -EINVAL;
1da177e4 LT	147
53b2bf3f	148	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
cee63723 PM	149	if (err < 0)
	150	return err;
	151
7ba699c6	152	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	153	return -EINVAL;
7ba699c6	154	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	155	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	156	return -EINVAL;
7ba699c6	157	parm = nla_data(tb[TCA_POLICE_TBF]);
1da177e4	158
e9ce1cd3 DM	159	if (parm->index) {
	160	struct tcf_common *pc;
	161
	162	pc = tcf_hash_lookup(parm->index, &police_hash_info);
	163	if (pc != NULL) {
	164	a->priv = pc;
	165	police = to_police(pc);
	166	if (bind) {
	167	police->tcf_bindcnt += 1;
	168	police->tcf_refcnt += 1;
	169	}
	170	if (ovr)
	171	goto override;
	172	return ret;
1da177e4	173	}
1da177e4 LT	174	}
1da177e4 LT	175
e9ce1cd3 DM	176	police = kzalloc(sizeof(*police), GFP_KERNEL);
e9ce1cd3 DM	177	if (police == NULL)
1da177e4	178	return -ENOMEM;
1da177e4	179	ret = ACT_P_CREATED;
e9ce1cd3 DM	180	police->tcf_refcnt = 1;
e9ce1cd3 DM	181	spin_lock_init(&police->tcf_lock);
1da177e4	182	if (bind)
e9ce1cd3	183	police->tcf_bindcnt = 1;
1da177e4 LT	184	override:
	185	if (parm->rate.rate) {
	186	err = -ENOMEM;
7ba699c6	187	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
1da177e4 LT	188	if (R_tab == NULL)
1da177e4 LT	189	goto failure;
c1b56878	190
1da177e4 LT	191	if (parm->peakrate.rate) {
1da177e4 LT	192	P_tab = qdisc_get_rtab(&parm->peakrate,
7ba699c6	193	tb[TCA_POLICE_PEAKRATE]);
71bcb09a	194	if (P_tab == NULL)
1da177e4	195	goto failure;
1da177e4 LT	196	}
1da177e4 LT	197	}
71bcb09a	198
e9ce1cd3	199	spin_lock_bh(&police->tcf_lock);
71bcb09a SH	200	if (est) {
	201	err = gen_replace_estimator(&police->tcf_bstats,
	202	&police->tcf_rate_est,
	203	&police->tcf_lock, est);
	204	if (err)
	205	goto failure_unlock;
a883bf56 JP	206	} else if (tb[TCA_POLICE_AVRATE] &&
	207	(ret == ACT_P_CREATED \|\|
	208	!gen_estimator_active(&police->tcf_bstats,
	209	&police->tcf_rate_est))) {
	210	err = -EINVAL;
	211	goto failure_unlock;
71bcb09a SH	212	}
	213
	214	/* No failure allowed after this point */
1da177e4	215	if (R_tab != NULL) {
e9ce1cd3 DM	216	qdisc_put_rtab(police->tcfp_R_tab);
e9ce1cd3 DM	217	police->tcfp_R_tab = R_tab;
1da177e4 LT	218	}
1da177e4 LT	219	if (P_tab != NULL) {
e9ce1cd3 DM	220	qdisc_put_rtab(police->tcfp_P_tab);
e9ce1cd3 DM	221	police->tcfp_P_tab = P_tab;
1da177e4 LT	222	}
1da177e4 LT	223
7ba699c6	224	if (tb[TCA_POLICE_RESULT])
1587bac4	225	police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
e9ce1cd3 DM	226	police->tcfp_toks = police->tcfp_burst = parm->burst;
	227	police->tcfp_mtu = parm->mtu;
	228	if (police->tcfp_mtu == 0) {
	229	police->tcfp_mtu = ~0;
	230	if (police->tcfp_R_tab)
	231	police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
1da177e4	232	}
e9ce1cd3 DM	233	if (police->tcfp_P_tab)
	234	police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
	235	police->tcf_action = parm->action;
1da177e4	236
7ba699c6	237	if (tb[TCA_POLICE_AVRATE])
1587bac4	238	police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	239
e9ce1cd3	240	spin_unlock_bh(&police->tcf_lock);
1da177e4 LT	241	if (ret != ACT_P_CREATED)
	242	return ret;
	243
3bebcda2	244	police->tcfp_t_c = psched_get_time();
e9ce1cd3 DM	245	police->tcf_index = parm->index ? parm->index :
	246	tcf_hash_new_index(&police_idx_gen, &police_hash_info);
	247	h = tcf_hash(police->tcf_index, POL_TAB_MASK);
1da177e4	248	write_lock_bh(&police_lock);
e9ce1cd3 DM	249	police->tcf_next = tcf_police_ht[h];
e9ce1cd3 DM	250	tcf_police_ht[h] = &police->common;
1da177e4 LT	251	write_unlock_bh(&police_lock);
1da177e4 LT	252
e9ce1cd3	253	a->priv = police;
1da177e4 LT	254	return ret;
1da177e4 LT	255
71bcb09a SH	256	failure_unlock:
71bcb09a SH	257	spin_unlock_bh(&police->tcf_lock);
1da177e4	258	failure:
71bcb09a SH	259	if (P_tab)
	260	qdisc_put_rtab(P_tab);
	261	if (R_tab)
	262	qdisc_put_rtab(R_tab);
1da177e4	263	if (ret == ACT_P_CREATED)
e9ce1cd3	264	kfree(police);
1da177e4 LT	265	return err;
	266	}
	267
	268	static int tcf_act_police_cleanup(struct tc_action *a, int bind)
	269	{
e9ce1cd3	270	struct tcf_police *p = a->priv;
c3bc7cff	271	int ret = 0;
1da177e4	272
c3bc7cff PM	273	if (p != NULL) {
	274	if (bind)
	275	p->tcf_bindcnt--;
	276
	277	p->tcf_refcnt--;
	278	if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) {
	279	tcf_police_destroy(p);
	280	ret = 1;
	281	}
	282	}
	283	return ret;
1da177e4 LT	284	}
1da177e4 LT	285
dc7f9f6e	286	static int tcf_act_police(struct sk_buff skb, const struct tc_action a,
10297b99	287	struct tcf_result *res)
1da177e4	288	{
e9ce1cd3	289	struct tcf_police *police = a->priv;
1da177e4	290	psched_time_t now;
1da177e4 LT	291	long toks;
	292	long ptoks = 0;
	293
e9ce1cd3	294	spin_lock(&police->tcf_lock);
1da177e4	295
bfe0d029	296	bstats_update(&police->tcf_bstats, skb);
1da177e4	297
e9ce1cd3 DM	298	if (police->tcfp_ewma_rate &&
	299	police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
	300	police->tcf_qstats.overlimits++;
b9647580 JP	301	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	302	police->tcf_qstats.drops++;
e9ce1cd3 DM	303	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	304	return police->tcf_action;
1da177e4	305	}
1da177e4	306
0abf77e5	307	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
e9ce1cd3 DM	308	if (police->tcfp_R_tab == NULL) {
	309	spin_unlock(&police->tcf_lock);
	310	return police->tcfp_result;
1da177e4 LT	311	}
1da177e4 LT	312
3bebcda2	313	now = psched_get_time();
03cc45c0 PM	314	toks = psched_tdiff_bounded(now, police->tcfp_t_c,
03cc45c0 PM	315	police->tcfp_burst);
e9ce1cd3 DM	316	if (police->tcfp_P_tab) {
	317	ptoks = toks + police->tcfp_ptoks;
	318	if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
	319	ptoks = (long)L2T_P(police, police->tcfp_mtu);
0abf77e5	320	ptoks -= L2T_P(police, qdisc_pkt_len(skb));
1da177e4	321	}
e9ce1cd3 DM	322	toks += police->tcfp_toks;
	323	if (toks > (long)police->tcfp_burst)
	324	toks = police->tcfp_burst;
0abf77e5	325	toks -= L2T(police, qdisc_pkt_len(skb));
1da177e4	326	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	327	police->tcfp_t_c = now;
	328	police->tcfp_toks = toks;
	329	police->tcfp_ptoks = ptoks;
	330	spin_unlock(&police->tcf_lock);
	331	return police->tcfp_result;
1da177e4 LT	332	}
	333	}
	334
e9ce1cd3	335	police->tcf_qstats.overlimits++;
b9647580 JP	336	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	337	police->tcf_qstats.drops++;
e9ce1cd3 DM	338	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	339	return police->tcf_action;
1da177e4 LT	340	}
	341
	342	static int
	343	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	344	{
27a884dc	345	unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3	346	struct tcf_police *police = a->priv;
0f04cfd0 JM	347	struct tc_police opt = {
	348	.index = police->tcf_index,
	349	.action = police->tcf_action,
	350	.mtu = police->tcfp_mtu,
	351	.burst = police->tcfp_burst,
	352	.refcnt = police->tcf_refcnt - ref,
	353	.bindcnt = police->tcf_bindcnt - bind,
	354	};
	355
e9ce1cd3 DM	356	if (police->tcfp_R_tab)
e9ce1cd3 DM	357	opt.rate = police->tcfp_R_tab->rate;
e9ce1cd3 DM	358	if (police->tcfp_P_tab)
e9ce1cd3 DM	359	opt.peakrate = police->tcfp_P_tab->rate;
1b34ec43 DM	360	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
	361	goto nla_put_failure;
	362	if (police->tcfp_result &&
	363	nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
	364	goto nla_put_failure;
	365	if (police->tcfp_ewma_rate &&
	366	nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
	367	goto nla_put_failure;
1da177e4 LT	368	return skb->len;
1da177e4 LT	369
7ba699c6	370	nla_put_failure:
dc5fc579	371	nlmsg_trim(skb, b);
1da177e4 LT	372	return -1;
	373	}
	374
	375	MODULE_AUTHOR("Alexey Kuznetsov");
	376	MODULE_DESCRIPTION("Policing actions");
	377	MODULE_LICENSE("GPL");
	378
	379	static struct tc_action_ops act_police_ops = {
	380	.kind = "police",
e9ce1cd3	381	.hinfo = &police_hash_info,
1da177e4 LT	382	.type = TCA_ID_POLICE,
	383	.capab = TCA_CAP_NONE,
	384	.owner = THIS_MODULE,
	385	.act = tcf_act_police,
	386	.dump = tcf_act_police_dump,
	387	.cleanup = tcf_act_police_cleanup,
e9ce1cd3	388	.lookup = tcf_hash_search,
1da177e4	389	.init = tcf_act_police_locate,
83b950c8	390	.walk = tcf_act_police_walker
1da177e4 LT	391	};
	392
	393	static int __init
	394	police_init_module(void)
	395	{
	396	return tcf_register_action(&act_police_ops);
	397	}
	398
	399	static void __exit
	400	police_cleanup_module(void)
	401	{
	402	tcf_unregister_action(&act_police_ops);
	403	}
	404
	405	module_init(police_init_module);
	406	module_exit(police_cleanup_module);