[thirdparty/kernel/stable.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 *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 (!est && (ret == ACT_P_CREATED ||
			     !gen_estimator_active(&police->tcf_bstats,
						   &police->tcf_rate_est))) {
			err = -EINVAL;
			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;
	}

	/* 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++;
		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++;
	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>
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;
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);
1da177e4 LT	115	kfree(p);
	116	return;
	117	}
	118	}
547b792c	119	WARN_ON(1);
1da177e4 LT	120	}
1da177e4 LT	121
53b2bf3f PM	122	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	123	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	124	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	125	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	126	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	127	};
	128
7ba699c6	129	static int tcf_act_police_locate(struct nlattr nla, struct nlattr est,
10297b99	130	struct tc_action *a, int ovr, int bind)
1da177e4 LT	131	{
	132	unsigned h;
	133	int ret = 0, err;
7ba699c6	134	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	135	struct tc_police *parm;
e9ce1cd3	136	struct tcf_police *police;
1da177e4	137	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
1e9b3d53	138	int size;
1da177e4	139
cee63723	140	if (nla == NULL)
1da177e4 LT	141	return -EINVAL;
1da177e4 LT	142
53b2bf3f	143	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
cee63723 PM	144	if (err < 0)
	145	return err;
	146
7ba699c6	147	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	148	return -EINVAL;
7ba699c6	149	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	150	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	151	return -EINVAL;
7ba699c6	152	parm = nla_data(tb[TCA_POLICE_TBF]);
1da177e4	153
e9ce1cd3 DM	154	if (parm->index) {
	155	struct tcf_common *pc;
	156
	157	pc = tcf_hash_lookup(parm->index, &police_hash_info);
	158	if (pc != NULL) {
	159	a->priv = pc;
	160	police = to_police(pc);
	161	if (bind) {
	162	police->tcf_bindcnt += 1;
	163	police->tcf_refcnt += 1;
	164	}
	165	if (ovr)
	166	goto override;
	167	return ret;
1da177e4	168	}
1da177e4 LT	169	}
1da177e4 LT	170
e9ce1cd3 DM	171	police = kzalloc(sizeof(*police), GFP_KERNEL);
e9ce1cd3 DM	172	if (police == NULL)
1da177e4	173	return -ENOMEM;
1da177e4	174	ret = ACT_P_CREATED;
e9ce1cd3 DM	175	police->tcf_refcnt = 1;
e9ce1cd3 DM	176	spin_lock_init(&police->tcf_lock);
1da177e4	177	if (bind)
e9ce1cd3	178	police->tcf_bindcnt = 1;
1da177e4 LT	179	override:
	180	if (parm->rate.rate) {
	181	err = -ENOMEM;
7ba699c6	182	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
1da177e4 LT	183	if (R_tab == NULL)
1da177e4 LT	184	goto failure;
c1b56878	185
244e6c2d JP	186	if (!est && (ret == ACT_P_CREATED \|\|
	187	!gen_estimator_active(&police->tcf_bstats,
	188	&police->tcf_rate_est))) {
c1b56878 SH	189	err = -EINVAL;
	190	goto failure;
	191	}
	192
1da177e4 LT	193	if (parm->peakrate.rate) {
1da177e4 LT	194	P_tab = qdisc_get_rtab(&parm->peakrate,
7ba699c6	195	tb[TCA_POLICE_PEAKRATE]);
71bcb09a	196	if (P_tab == NULL)
1da177e4	197	goto failure;
1da177e4 LT	198	}
1da177e4 LT	199	}
71bcb09a	200
e9ce1cd3	201	spin_lock_bh(&police->tcf_lock);
71bcb09a SH	202	if (est) {
	203	err = gen_replace_estimator(&police->tcf_bstats,
	204	&police->tcf_rate_est,
	205	&police->tcf_lock, est);
	206	if (err)
	207	goto failure_unlock;
	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++;
	298	spin_unlock(&police->tcf_lock);
	299	return police->tcf_action;
1da177e4	300	}
1da177e4	301
0abf77e5	302	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
e9ce1cd3 DM	303	if (police->tcfp_R_tab == NULL) {
	304	spin_unlock(&police->tcf_lock);
	305	return police->tcfp_result;
1da177e4 LT	306	}
1da177e4 LT	307
3bebcda2	308	now = psched_get_time();
03cc45c0 PM	309	toks = psched_tdiff_bounded(now, police->tcfp_t_c,
03cc45c0 PM	310	police->tcfp_burst);
e9ce1cd3 DM	311	if (police->tcfp_P_tab) {
	312	ptoks = toks + police->tcfp_ptoks;
	313	if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
	314	ptoks = (long)L2T_P(police, police->tcfp_mtu);
0abf77e5	315	ptoks -= L2T_P(police, qdisc_pkt_len(skb));
1da177e4	316	}
e9ce1cd3 DM	317	toks += police->tcfp_toks;
	318	if (toks > (long)police->tcfp_burst)
	319	toks = police->tcfp_burst;
0abf77e5	320	toks -= L2T(police, qdisc_pkt_len(skb));
1da177e4	321	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	322	police->tcfp_t_c = now;
	323	police->tcfp_toks = toks;
	324	police->tcfp_ptoks = ptoks;
	325	spin_unlock(&police->tcf_lock);
	326	return police->tcfp_result;
1da177e4 LT	327	}
	328	}
	329
e9ce1cd3 DM	330	police->tcf_qstats.overlimits++;
	331	spin_unlock(&police->tcf_lock);
	332	return police->tcf_action;
1da177e4 LT	333	}
	334
	335	static int
	336	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	337	{
27a884dc	338	unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3	339	struct tcf_police *police = a->priv;
1da177e4	340	struct tc_police opt;
e9ce1cd3 DM	341
	342	opt.index = police->tcf_index;
	343	opt.action = police->tcf_action;
	344	opt.mtu = police->tcfp_mtu;
	345	opt.burst = police->tcfp_burst;
	346	opt.refcnt = police->tcf_refcnt - ref;
	347	opt.bindcnt = police->tcf_bindcnt - bind;
	348	if (police->tcfp_R_tab)
	349	opt.rate = police->tcfp_R_tab->rate;
1da177e4 LT	350	else
1da177e4 LT	351	memset(&opt.rate, 0, sizeof(opt.rate));
e9ce1cd3 DM	352	if (police->tcfp_P_tab)
e9ce1cd3 DM	353	opt.peakrate = police->tcfp_P_tab->rate;
1da177e4 LT	354	else
1da177e4 LT	355	memset(&opt.peakrate, 0, sizeof(opt.peakrate));
7ba699c6	356	NLA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
e9ce1cd3	357	if (police->tcfp_result)
24beeab5	358	NLA_PUT_U32(skb, TCA_POLICE_RESULT, police->tcfp_result);
e9ce1cd3	359	if (police->tcfp_ewma_rate)
24beeab5	360	NLA_PUT_U32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate);
1da177e4 LT	361	return skb->len;
1da177e4 LT	362
7ba699c6	363	nla_put_failure:
dc5fc579	364	nlmsg_trim(skb, b);
1da177e4 LT	365	return -1;
	366	}
	367
	368	MODULE_AUTHOR("Alexey Kuznetsov");
	369	MODULE_DESCRIPTION("Policing actions");
	370	MODULE_LICENSE("GPL");
	371
	372	static struct tc_action_ops act_police_ops = {
	373	.kind = "police",
e9ce1cd3	374	.hinfo = &police_hash_info,
1da177e4 LT	375	.type = TCA_ID_POLICE,
	376	.capab = TCA_CAP_NONE,
	377	.owner = THIS_MODULE,
	378	.act = tcf_act_police,
	379	.dump = tcf_act_police_dump,
	380	.cleanup = tcf_act_police_cleanup,
e9ce1cd3	381	.lookup = tcf_hash_search,
1da177e4	382	.init = tcf_act_police_locate,
83b950c8	383	.walk = tcf_act_police_walker
1da177e4 LT	384	};
	385
	386	static int __init
	387	police_init_module(void)
	388	{
	389	return tcf_register_action(&act_police_ops);
	390	}
	391
	392	static void __exit
	393	police_cleanup_module(void)
	394	{
	395	tcf_unregister_action(&act_police_ops);
	396	}
	397
	398	module_init(police_init_module);
	399	module_exit(police_cleanup_module);