[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>

struct tcf_police {
	struct tcf_common	common;
	int			tcfp_result;
	u32			tcfp_ewma_rate;
	u32			tcfp_burst;
	u32			tcfp_mtu;
	u32			tcfp_toks;
	u32			tcfp_ptoks;
	psched_time_t		tcfp_t_c;
	struct qdisc_rate_table	*tcfp_R_tab;
	struct qdisc_rate_table	*tcfp_P_tab;
};
#define to_police(pc)	\
	container_of(pc, struct tcf_police, common)

#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, <[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
0e243218 JP	25	struct tcf_police {
	26	struct tcf_common common;
	27	int tcfp_result;
	28	u32 tcfp_ewma_rate;
	29	u32 tcfp_burst;
	30	u32 tcfp_mtu;
	31	u32 tcfp_toks;
	32	u32 tcfp_ptoks;
	33	psched_time_t tcfp_t_c;
	34	struct qdisc_rate_table *tcfp_R_tab;
	35	struct qdisc_rate_table *tcfp_P_tab;
	36	};
	37	#define to_police(pc) \
	38	container_of(pc, struct tcf_police, common)
	39
cc7ec456 ED	40	#define L2T(p, L) qdisc_l2t((p)->tcfp_R_tab, L)
cc7ec456 ED	41	#define L2T_P(p, L) qdisc_l2t((p)->tcfp_P_tab, L)
1da177e4	42
e9ce1cd3 DM	43	#define POL_TAB_MASK 15
	44	static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1];
	45	static u32 police_idx_gen;
	46	static DEFINE_RWLOCK(police_lock);
1da177e4	47
e9ce1cd3 DM	48	static struct tcf_hashinfo police_hash_info = {
	49	.htab = tcf_police_ht,
	50	.hmask = POL_TAB_MASK,
	51	.lock = &police_lock,
	52	};
1da177e4	53
1e9b3d53	54	/* old policer structure from before tc actions */
cc7ec456	55	struct tc_police_compat {
1e9b3d53 PM	56	u32 index;
	57	int action;
	58	u32 limit;
	59	u32 burst;
	60	u32 mtu;
	61	struct tc_ratespec rate;
	62	struct tc_ratespec peakrate;
	63	};
	64
e9ce1cd3	65	/* Each policer is serialized by its individual spinlock */
1da177e4	66
83b950c8	67	static int tcf_act_police_walker(struct sk_buff skb, struct netlink_callback cb,
10297b99	68	int type, struct tc_action *a)
1da177e4	69	{
e9ce1cd3	70	struct tcf_common *p;
1da177e4	71	int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
4b3550ef	72	struct nlattr *nest;
1da177e4	73
e1e992e5	74	read_lock_bh(&police_lock);
1da177e4 LT	75
	76	s_i = cb->args[0];
	77
e9ce1cd3 DM	78	for (i = 0; i < (POL_TAB_MASK + 1); i++) {
e9ce1cd3 DM	79	p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)];
1da177e4	80
e9ce1cd3	81	for (; p; p = p->tcfc_next) {
1da177e4 LT	82	index++;
	83	if (index < s_i)
	84	continue;
	85	a->priv = p;
	86	a->order = index;
4b3550ef PM	87	nest = nla_nest_start(skb, a->order);
	88	if (nest == NULL)
	89	goto nla_put_failure;
1da177e4 LT	90	if (type == RTM_DELACTION)
	91	err = tcf_action_dump_1(skb, a, 0, 1);
	92	else
	93	err = tcf_action_dump_1(skb, a, 0, 0);
	94	if (err < 0) {
	95	index--;
4b3550ef	96	nla_nest_cancel(skb, nest);
1da177e4 LT	97	goto done;
1da177e4 LT	98	}
4b3550ef	99	nla_nest_end(skb, nest);
1da177e4 LT	100	n_i++;
	101	}
	102	}
	103	done:
e1e992e5	104	read_unlock_bh(&police_lock);
1da177e4 LT	105	if (n_i)
	106	cb->args[0] += n_i;
	107	return n_i;
	108
7ba699c6	109	nla_put_failure:
4b3550ef	110	nla_nest_cancel(skb, nest);
1da177e4 LT	111	goto done;
1da177e4 LT	112	}
1da177e4	113
c3bc7cff	114	static void tcf_police_destroy(struct tcf_police *p)
1da177e4	115	{
e9ce1cd3 DM	116	unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
e9ce1cd3 DM	117	struct tcf_common **p1p;
10297b99	118
e9ce1cd3 DM	119	for (p1p = &tcf_police_ht[h]; p1p; p1p = &(p1p)->tcfc_next) {
e9ce1cd3 DM	120	if (*p1p == &p->common) {
1da177e4	121	write_lock_bh(&police_lock);
e9ce1cd3	122	*p1p = p->tcf_next;
1da177e4	123	write_unlock_bh(&police_lock);
e9ce1cd3 DM	124	gen_kill_estimator(&p->tcf_bstats,
e9ce1cd3 DM	125	&p->tcf_rate_est);
e9ce1cd3 DM	126	if (p->tcfp_R_tab)
	127	qdisc_put_rtab(p->tcfp_R_tab);
	128	if (p->tcfp_P_tab)
	129	qdisc_put_rtab(p->tcfp_P_tab);
c7de2cf0 ED	130	/*
	131	* gen_estimator est_timer() might access p->tcf_lock
	132	* or bstats, wait a RCU grace period before freeing p
	133	*/
5957b1ac	134	kfree_rcu(p, tcf_rcu);
1da177e4 LT	135	return;
	136	}
	137	}
547b792c	138	WARN_ON(1);
1da177e4 LT	139	}
1da177e4 LT	140
53b2bf3f PM	141	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	142	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	143	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	144	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	145	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	146	};
	147
c1b52739 BL	148	static int tcf_act_police_locate(struct net net, struct nlattr nla,
	149	struct nlattr est, struct tc_action a,
	150	int ovr, int bind)
1da177e4	151	{
cc7ec456	152	unsigned int h;
1da177e4	153	int ret = 0, err;
7ba699c6	154	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	155	struct tc_police *parm;
e9ce1cd3	156	struct tcf_police *police;
1da177e4	157	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
1e9b3d53	158	int size;
1da177e4	159
cee63723	160	if (nla == NULL)
1da177e4 LT	161	return -EINVAL;
1da177e4 LT	162
53b2bf3f	163	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
cee63723 PM	164	if (err < 0)
	165	return err;
	166
7ba699c6	167	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	168	return -EINVAL;
7ba699c6	169	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	170	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	171	return -EINVAL;
7ba699c6	172	parm = nla_data(tb[TCA_POLICE_TBF]);
1da177e4	173
e9ce1cd3 DM	174	if (parm->index) {
	175	struct tcf_common *pc;
	176
	177	pc = tcf_hash_lookup(parm->index, &police_hash_info);
	178	if (pc != NULL) {
	179	a->priv = pc;
	180	police = to_police(pc);
	181	if (bind) {
	182	police->tcf_bindcnt += 1;
	183	police->tcf_refcnt += 1;
	184	}
	185	if (ovr)
	186	goto override;
	187	return ret;
1da177e4	188	}
1da177e4 LT	189	}
1da177e4 LT	190
e9ce1cd3 DM	191	police = kzalloc(sizeof(*police), GFP_KERNEL);
e9ce1cd3 DM	192	if (police == NULL)
1da177e4	193	return -ENOMEM;
1da177e4	194	ret = ACT_P_CREATED;
e9ce1cd3 DM	195	police->tcf_refcnt = 1;
e9ce1cd3 DM	196	spin_lock_init(&police->tcf_lock);
1da177e4	197	if (bind)
e9ce1cd3	198	police->tcf_bindcnt = 1;
1da177e4 LT	199	override:
	200	if (parm->rate.rate) {
	201	err = -ENOMEM;
7ba699c6	202	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
1da177e4 LT	203	if (R_tab == NULL)
1da177e4 LT	204	goto failure;
c1b56878	205
1da177e4 LT	206	if (parm->peakrate.rate) {
1da177e4 LT	207	P_tab = qdisc_get_rtab(&parm->peakrate,
7ba699c6	208	tb[TCA_POLICE_PEAKRATE]);
71bcb09a	209	if (P_tab == NULL)
1da177e4	210	goto failure;
1da177e4 LT	211	}
1da177e4 LT	212	}
71bcb09a	213
e9ce1cd3	214	spin_lock_bh(&police->tcf_lock);
71bcb09a SH	215	if (est) {
	216	err = gen_replace_estimator(&police->tcf_bstats,
	217	&police->tcf_rate_est,
	218	&police->tcf_lock, est);
	219	if (err)
	220	goto failure_unlock;
a883bf56 JP	221	} else if (tb[TCA_POLICE_AVRATE] &&
	222	(ret == ACT_P_CREATED \|\|
	223	!gen_estimator_active(&police->tcf_bstats,
	224	&police->tcf_rate_est))) {
	225	err = -EINVAL;
	226	goto failure_unlock;
71bcb09a SH	227	}
	228
	229	/* No failure allowed after this point */
1da177e4	230	if (R_tab != NULL) {
e9ce1cd3 DM	231	qdisc_put_rtab(police->tcfp_R_tab);
e9ce1cd3 DM	232	police->tcfp_R_tab = R_tab;
1da177e4 LT	233	}
1da177e4 LT	234	if (P_tab != NULL) {
e9ce1cd3 DM	235	qdisc_put_rtab(police->tcfp_P_tab);
e9ce1cd3 DM	236	police->tcfp_P_tab = P_tab;
1da177e4 LT	237	}
1da177e4 LT	238
7ba699c6	239	if (tb[TCA_POLICE_RESULT])
1587bac4	240	police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
e9ce1cd3 DM	241	police->tcfp_toks = police->tcfp_burst = parm->burst;
	242	police->tcfp_mtu = parm->mtu;
	243	if (police->tcfp_mtu == 0) {
	244	police->tcfp_mtu = ~0;
	245	if (police->tcfp_R_tab)
	246	police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
1da177e4	247	}
e9ce1cd3 DM	248	if (police->tcfp_P_tab)
	249	police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
	250	police->tcf_action = parm->action;
1da177e4	251
7ba699c6	252	if (tb[TCA_POLICE_AVRATE])
1587bac4	253	police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	254
e9ce1cd3	255	spin_unlock_bh(&police->tcf_lock);
1da177e4 LT	256	if (ret != ACT_P_CREATED)
	257	return ret;
	258
3bebcda2	259	police->tcfp_t_c = psched_get_time();
e9ce1cd3 DM	260	police->tcf_index = parm->index ? parm->index :
	261	tcf_hash_new_index(&police_idx_gen, &police_hash_info);
	262	h = tcf_hash(police->tcf_index, POL_TAB_MASK);
1da177e4	263	write_lock_bh(&police_lock);
e9ce1cd3 DM	264	police->tcf_next = tcf_police_ht[h];
e9ce1cd3 DM	265	tcf_police_ht[h] = &police->common;
1da177e4 LT	266	write_unlock_bh(&police_lock);
1da177e4 LT	267
e9ce1cd3	268	a->priv = police;
1da177e4 LT	269	return ret;
1da177e4 LT	270
71bcb09a SH	271	failure_unlock:
71bcb09a SH	272	spin_unlock_bh(&police->tcf_lock);
1da177e4	273	failure:
71bcb09a SH	274	if (P_tab)
	275	qdisc_put_rtab(P_tab);
	276	if (R_tab)
	277	qdisc_put_rtab(R_tab);
1da177e4	278	if (ret == ACT_P_CREATED)
e9ce1cd3	279	kfree(police);
1da177e4 LT	280	return err;
	281	}
	282
	283	static int tcf_act_police_cleanup(struct tc_action *a, int bind)
	284	{
e9ce1cd3	285	struct tcf_police *p = a->priv;
c3bc7cff	286	int ret = 0;
1da177e4	287
c3bc7cff PM	288	if (p != NULL) {
	289	if (bind)
	290	p->tcf_bindcnt--;
	291
	292	p->tcf_refcnt--;
	293	if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) {
	294	tcf_police_destroy(p);
	295	ret = 1;
	296	}
	297	}
	298	return ret;
1da177e4 LT	299	}
1da177e4 LT	300
dc7f9f6e	301	static int tcf_act_police(struct sk_buff skb, const struct tc_action a,
10297b99	302	struct tcf_result *res)
1da177e4	303	{
e9ce1cd3	304	struct tcf_police *police = a->priv;
1da177e4	305	psched_time_t now;
1da177e4 LT	306	long toks;
	307	long ptoks = 0;
	308
e9ce1cd3	309	spin_lock(&police->tcf_lock);
1da177e4	310
bfe0d029	311	bstats_update(&police->tcf_bstats, skb);
1da177e4	312
e9ce1cd3 DM	313	if (police->tcfp_ewma_rate &&
	314	police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
	315	police->tcf_qstats.overlimits++;
b9647580 JP	316	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	317	police->tcf_qstats.drops++;
e9ce1cd3 DM	318	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	319	return police->tcf_action;
1da177e4	320	}
1da177e4	321
0abf77e5	322	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
e9ce1cd3 DM	323	if (police->tcfp_R_tab == NULL) {
	324	spin_unlock(&police->tcf_lock);
	325	return police->tcfp_result;
1da177e4 LT	326	}
1da177e4 LT	327
3bebcda2	328	now = psched_get_time();
03cc45c0 PM	329	toks = psched_tdiff_bounded(now, police->tcfp_t_c,
03cc45c0 PM	330	police->tcfp_burst);
e9ce1cd3 DM	331	if (police->tcfp_P_tab) {
	332	ptoks = toks + police->tcfp_ptoks;
	333	if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
	334	ptoks = (long)L2T_P(police, police->tcfp_mtu);
0abf77e5	335	ptoks -= L2T_P(police, qdisc_pkt_len(skb));
1da177e4	336	}
e9ce1cd3 DM	337	toks += police->tcfp_toks;
	338	if (toks > (long)police->tcfp_burst)
	339	toks = police->tcfp_burst;
0abf77e5	340	toks -= L2T(police, qdisc_pkt_len(skb));
1da177e4	341	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	342	police->tcfp_t_c = now;
	343	police->tcfp_toks = toks;
	344	police->tcfp_ptoks = ptoks;
	345	spin_unlock(&police->tcf_lock);
	346	return police->tcfp_result;
1da177e4 LT	347	}
	348	}
	349
e9ce1cd3	350	police->tcf_qstats.overlimits++;
b9647580 JP	351	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	352	police->tcf_qstats.drops++;
e9ce1cd3 DM	353	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	354	return police->tcf_action;
1da177e4 LT	355	}
	356
	357	static int
	358	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	359	{
27a884dc	360	unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3	361	struct tcf_police *police = a->priv;
0f04cfd0 JM	362	struct tc_police opt = {
	363	.index = police->tcf_index,
	364	.action = police->tcf_action,
	365	.mtu = police->tcfp_mtu,
	366	.burst = police->tcfp_burst,
	367	.refcnt = police->tcf_refcnt - ref,
	368	.bindcnt = police->tcf_bindcnt - bind,
	369	};
	370
e9ce1cd3 DM	371	if (police->tcfp_R_tab)
e9ce1cd3 DM	372	opt.rate = police->tcfp_R_tab->rate;
e9ce1cd3 DM	373	if (police->tcfp_P_tab)
e9ce1cd3 DM	374	opt.peakrate = police->tcfp_P_tab->rate;
1b34ec43 DM	375	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
	376	goto nla_put_failure;
	377	if (police->tcfp_result &&
	378	nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
	379	goto nla_put_failure;
	380	if (police->tcfp_ewma_rate &&
	381	nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
	382	goto nla_put_failure;
1da177e4 LT	383	return skb->len;
1da177e4 LT	384
7ba699c6	385	nla_put_failure:
dc5fc579	386	nlmsg_trim(skb, b);
1da177e4 LT	387	return -1;
	388	}
	389
	390	MODULE_AUTHOR("Alexey Kuznetsov");
	391	MODULE_DESCRIPTION("Policing actions");
	392	MODULE_LICENSE("GPL");
	393
	394	static struct tc_action_ops act_police_ops = {
	395	.kind = "police",
e9ce1cd3	396	.hinfo = &police_hash_info,
1da177e4 LT	397	.type = TCA_ID_POLICE,
	398	.capab = TCA_CAP_NONE,
	399	.owner = THIS_MODULE,
	400	.act = tcf_act_police,
	401	.dump = tcf_act_police_dump,
	402	.cleanup = tcf_act_police_cleanup,
e9ce1cd3	403	.lookup = tcf_hash_search,
1da177e4	404	.init = tcf_act_police_locate,
83b950c8	405	.walk = tcf_act_police_walker
1da177e4 LT	406	};
	407
	408	static int __init
	409	police_init_module(void)
	410	{
	411	return tcf_register_action(&act_police_ops);
	412	}
	413
	414	static void __exit
	415	police_cleanup_module(void)
	416	{
	417	tcf_unregister_action(&act_police_ops);
	418	}
	419
	420	module_init(police_init_module);
	421	module_exit(police_cleanup_module);