[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>

struct tcf_police {
	struct tcf_common	common;
	int			tcfp_result;
	u32			tcfp_ewma_rate;
	s64			tcfp_burst;
	u32			tcfp_mtu;
	s64			tcfp_toks;
	s64			tcfp_ptoks;
	s64			tcfp_mtu_ptoks;
	s64			tcfp_t_c;
	struct psched_ratecfg	rate;
	bool			rate_present;
	struct psched_ratecfg	peak;
	bool			peak_present;
};
#define to_police(pc)	\
	container_of(pc, struct tcf_police, common)

#define POL_TAB_MASK     15
static struct tcf_hashinfo police_hash_info;

/* 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 hlist_head *head;
	struct tcf_common *p;
	int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
	struct nlattr *nest;

	spin_lock_bh(&police_hash_info.lock);

	s_i = cb->args[0];

	for (i = 0; i < (POL_TAB_MASK + 1); i++) {
		head = &police_hash_info.htab[tcf_hash(i, POL_TAB_MASK)];

		hlist_for_each_entry_rcu(p, head, tcfc_head) {
			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:
	spin_unlock_bh(&police_hash_info.lock);
	if (n_i)
		cb->args[0] += n_i;
	return n_i;

nla_put_failure:
	nla_nest_cancel(skb, nest);
	goto done;
}

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;
				return 0;
			}
			if (ovr)
				goto override;
			/* not replacing */
			return -EEXIST;
		}
	}

	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 */
	police->tcfp_mtu = parm->mtu;
	if (police->tcfp_mtu == 0) {
		police->tcfp_mtu = ~0;
		if (R_tab)
			police->tcfp_mtu = 255 << R_tab->rate.cell_log;
	}
	if (R_tab) {
		police->rate_present = true;
		psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0);
		qdisc_put_rtab(R_tab);
	} else {
		police->rate_present = false;
	}
	if (P_tab) {
		police->peak_present = true;
		psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0);
		qdisc_put_rtab(P_tab);
	} else {
		police->peak_present = false;
	}

	if (tb[TCA_POLICE_RESULT])
		police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
	police->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
	police->tcfp_toks = police->tcfp_burst;
	if (police->peak_present) {
		police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak,
							     police->tcfp_mtu);
		police->tcfp_ptoks = police->tcfp_mtu_ptoks;
	}
	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 = ktime_to_ns(ktime_get());
	police->tcf_index = parm->index ? parm->index :
		tcf_hash_new_index(&police_hash_info);
	h = tcf_hash(police->tcf_index, POL_TAB_MASK);
	spin_lock_bh(&police_hash_info.lock);
	hlist_add_head(&police->tcf_head, &police_hash_info.htab[h]);
	spin_unlock_bh(&police_hash_info.lock);

	a->priv = police;
	return ret;

failure_unlock:
	spin_unlock_bh(&police->tcf_lock);
failure:
	qdisc_put_rtab(P_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;
	if (p)
		return tcf_hash_release(&p->common, bind, &police_hash_info);
	return 0;
}

static int tcf_act_police(struct sk_buff *skb, const struct tc_action *a,
			  struct tcf_result *res)
{
	struct tcf_police *police = a->priv;
	s64 now;
	s64 toks;
	s64 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->rate_present) {
			spin_unlock(&police->tcf_lock);
			return police->tcfp_result;
		}

		now = ktime_to_ns(ktime_get());
		toks = min_t(s64, now - police->tcfp_t_c,
			     police->tcfp_burst);
		if (police->peak_present) {
			ptoks = toks + police->tcfp_ptoks;
			if (ptoks > police->tcfp_mtu_ptoks)
				ptoks = police->tcfp_mtu_ptoks;
			ptoks -= (s64) psched_l2t_ns(&police->peak,
						     qdisc_pkt_len(skb));
		}
		toks += police->tcfp_toks;
		if (toks > police->tcfp_burst)
			toks = police->tcfp_burst;
		toks -= (s64) psched_l2t_ns(&police->rate, 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 = PSCHED_NS2TICKS(police->tcfp_burst),
		.refcnt = police->tcf_refcnt - ref,
		.bindcnt = police->tcf_bindcnt - bind,
	};

	if (police->rate_present)
		psched_ratecfg_getrate(&opt.rate, &police->rate);
	if (police->peak_present)
		psched_ratecfg_getrate(&opt.peakrate, &police->peak);
	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,
	.owner		=	THIS_MODULE,
	.act		=	tcf_act_police,
	.dump		=	tcf_act_police_dump,
	.cleanup	=	tcf_act_police_cleanup,
	.init		=	tcf_act_police_locate,
	.walk		=	tcf_act_police_walker
};

static int __init
police_init_module(void)
{
	int err = tcf_hashinfo_init(&police_hash_info, POL_TAB_MASK);
	if (err)
		return err;
	err = tcf_register_action(&act_police_ops);
	if (err)
		tcf_hashinfo_destroy(&police_hash_info);
	return err;
}

static void __exit
police_cleanup_module(void)
{
	tcf_hashinfo_destroy(&police_hash_info);
	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
0e243218 JP	25	struct tcf_police {
	26	struct tcf_common common;
	27	int tcfp_result;
	28	u32 tcfp_ewma_rate;
c6d14ff1	29	s64 tcfp_burst;
0e243218	30	u32 tcfp_mtu;
c6d14ff1 JP	31	s64 tcfp_toks;
	32	s64 tcfp_ptoks;
	33	s64 tcfp_mtu_ptoks;
	34	s64 tcfp_t_c;
	35	struct psched_ratecfg rate;
	36	bool rate_present;
	37	struct psched_ratecfg peak;
	38	bool peak_present;
0e243218 JP	39	};
	40	#define to_police(pc) \
	41	container_of(pc, struct tcf_police, common)
	42
e9ce1cd3	43	#define POL_TAB_MASK 15
369ba567	44	static struct tcf_hashinfo police_hash_info;
1da177e4	45
1e9b3d53	46	/* old policer structure from before tc actions */
cc7ec456	47	struct tc_police_compat {
1e9b3d53 PM	48	u32 index;
	49	int action;
	50	u32 limit;
	51	u32 burst;
	52	u32 mtu;
	53	struct tc_ratespec rate;
	54	struct tc_ratespec peakrate;
	55	};
	56
e9ce1cd3	57	/* Each policer is serialized by its individual spinlock */
1da177e4	58
83b950c8	59	static int tcf_act_police_walker(struct sk_buff skb, struct netlink_callback cb,
10297b99	60	int type, struct tc_action *a)
1da177e4	61	{
89819dc0	62	struct hlist_head *head;
e9ce1cd3	63	struct tcf_common *p;
1da177e4	64	int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
4b3550ef	65	struct nlattr *nest;
1da177e4	66
89819dc0	67	spin_lock_bh(&police_hash_info.lock);
1da177e4 LT	68
	69	s_i = cb->args[0];
	70
e9ce1cd3	71	for (i = 0; i < (POL_TAB_MASK + 1); i++) {
89819dc0	72	head = &police_hash_info.htab[tcf_hash(i, POL_TAB_MASK)];
1da177e4	73
89819dc0	74	hlist_for_each_entry_rcu(p, head, tcfc_head) {
1da177e4 LT	75	index++;
	76	if (index < s_i)
	77	continue;
	78	a->priv = p;
	79	a->order = index;
4b3550ef PM	80	nest = nla_nest_start(skb, a->order);
	81	if (nest == NULL)
	82	goto nla_put_failure;
1da177e4 LT	83	if (type == RTM_DELACTION)
	84	err = tcf_action_dump_1(skb, a, 0, 1);
	85	else
	86	err = tcf_action_dump_1(skb, a, 0, 0);
	87	if (err < 0) {
	88	index--;
4b3550ef	89	nla_nest_cancel(skb, nest);
1da177e4 LT	90	goto done;
1da177e4 LT	91	}
4b3550ef	92	nla_nest_end(skb, nest);
1da177e4 LT	93	n_i++;
	94	}
	95	}
	96	done:
89819dc0	97	spin_unlock_bh(&police_hash_info.lock);
1da177e4 LT	98	if (n_i)
	99	cb->args[0] += n_i;
	100	return n_i;
	101
7ba699c6	102	nla_put_failure:
4b3550ef	103	nla_nest_cancel(skb, nest);
1da177e4 LT	104	goto done;
1da177e4 LT	105	}
1da177e4	106
53b2bf3f PM	107	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	108	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	109	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	110	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	111	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	112	};
	113
c1b52739 BL	114	static int tcf_act_police_locate(struct net net, struct nlattr nla,
	115	struct nlattr est, struct tc_action a,
	116	int ovr, int bind)
1da177e4	117	{
cc7ec456	118	unsigned int h;
1da177e4	119	int ret = 0, err;
7ba699c6	120	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	121	struct tc_police *parm;
e9ce1cd3	122	struct tcf_police *police;
1da177e4	123	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
1e9b3d53	124	int size;
1da177e4	125
cee63723	126	if (nla == NULL)
1da177e4 LT	127	return -EINVAL;
1da177e4 LT	128
53b2bf3f	129	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
cee63723 PM	130	if (err < 0)
	131	return err;
	132
7ba699c6	133	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	134	return -EINVAL;
7ba699c6	135	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	136	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	137	return -EINVAL;
7ba699c6	138	parm = nla_data(tb[TCA_POLICE_TBF]);
1da177e4	139
e9ce1cd3 DM	140	if (parm->index) {
	141	struct tcf_common *pc;
	142
	143	pc = tcf_hash_lookup(parm->index, &police_hash_info);
	144	if (pc != NULL) {
	145	a->priv = pc;
	146	police = to_police(pc);
	147	if (bind) {
	148	police->tcf_bindcnt += 1;
	149	police->tcf_refcnt += 1;
1a29321e	150	return 0;
e9ce1cd3 DM	151	}
	152	if (ovr)
	153	goto override;
1a29321e JHS	154	/* not replacing */
1a29321e JHS	155	return -EEXIST;
1da177e4	156	}
1da177e4 LT	157	}
1da177e4 LT	158
e9ce1cd3 DM	159	police = kzalloc(sizeof(*police), GFP_KERNEL);
e9ce1cd3 DM	160	if (police == NULL)
1da177e4	161	return -ENOMEM;
1da177e4	162	ret = ACT_P_CREATED;
e9ce1cd3 DM	163	police->tcf_refcnt = 1;
e9ce1cd3 DM	164	spin_lock_init(&police->tcf_lock);
1da177e4	165	if (bind)
e9ce1cd3	166	police->tcf_bindcnt = 1;
1da177e4 LT	167	override:
	168	if (parm->rate.rate) {
	169	err = -ENOMEM;
7ba699c6	170	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
1da177e4 LT	171	if (R_tab == NULL)
1da177e4 LT	172	goto failure;
c1b56878	173
1da177e4 LT	174	if (parm->peakrate.rate) {
1da177e4 LT	175	P_tab = qdisc_get_rtab(&parm->peakrate,
7ba699c6	176	tb[TCA_POLICE_PEAKRATE]);
71bcb09a	177	if (P_tab == NULL)
1da177e4	178	goto failure;
1da177e4 LT	179	}
1da177e4 LT	180	}
71bcb09a	181
e9ce1cd3	182	spin_lock_bh(&police->tcf_lock);
71bcb09a SH	183	if (est) {
	184	err = gen_replace_estimator(&police->tcf_bstats,
	185	&police->tcf_rate_est,
	186	&police->tcf_lock, est);
	187	if (err)
	188	goto failure_unlock;
a883bf56 JP	189	} else if (tb[TCA_POLICE_AVRATE] &&
	190	(ret == ACT_P_CREATED \|\|
	191	!gen_estimator_active(&police->tcf_bstats,
	192	&police->tcf_rate_est))) {
	193	err = -EINVAL;
	194	goto failure_unlock;
71bcb09a SH	195	}
	196
	197	/* No failure allowed after this point */
c6d14ff1 JP	198	police->tcfp_mtu = parm->mtu;
	199	if (police->tcfp_mtu == 0) {
	200	police->tcfp_mtu = ~0;
	201	if (R_tab)
	202	police->tcfp_mtu = 255 << R_tab->rate.cell_log;
	203	}
	204	if (R_tab) {
	205	police->rate_present = true;
3e1e3aae	206	psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0);
c6d14ff1 JP	207	qdisc_put_rtab(R_tab);
	208	} else {
	209	police->rate_present = false;
1da177e4	210	}
c6d14ff1 JP	211	if (P_tab) {
c6d14ff1 JP	212	police->peak_present = true;
3e1e3aae	213	psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0);
c6d14ff1 JP	214	qdisc_put_rtab(P_tab);
	215	} else {
	216	police->peak_present = false;
1da177e4 LT	217	}
1da177e4 LT	218
7ba699c6	219	if (tb[TCA_POLICE_RESULT])
1587bac4	220	police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
c6d14ff1 JP	221	police->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
	222	police->tcfp_toks = police->tcfp_burst;
	223	if (police->peak_present) {
	224	police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak,
	225	police->tcfp_mtu);
	226	police->tcfp_ptoks = police->tcfp_mtu_ptoks;
1da177e4	227	}
e9ce1cd3	228	police->tcf_action = parm->action;
1da177e4	229
7ba699c6	230	if (tb[TCA_POLICE_AVRATE])
1587bac4	231	police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	232
e9ce1cd3	233	spin_unlock_bh(&police->tcf_lock);
1da177e4 LT	234	if (ret != ACT_P_CREATED)
	235	return ret;
	236
c6d14ff1	237	police->tcfp_t_c = ktime_to_ns(ktime_get());
e9ce1cd3	238	police->tcf_index = parm->index ? parm->index :
ddafd34f	239	tcf_hash_new_index(&police_hash_info);
e9ce1cd3	240	h = tcf_hash(police->tcf_index, POL_TAB_MASK);
89819dc0 WC	241	spin_lock_bh(&police_hash_info.lock);
	242	hlist_add_head(&police->tcf_head, &police_hash_info.htab[h]);
	243	spin_unlock_bh(&police_hash_info.lock);
1da177e4	244
e9ce1cd3	245	a->priv = police;
1da177e4 LT	246	return ret;
1da177e4 LT	247
71bcb09a SH	248	failure_unlock:
71bcb09a SH	249	spin_unlock_bh(&police->tcf_lock);
1da177e4	250	failure:
3b69a4c9 YY	251	qdisc_put_rtab(P_tab);
3b69a4c9 YY	252	qdisc_put_rtab(R_tab);
1da177e4	253	if (ret == ACT_P_CREATED)
e9ce1cd3	254	kfree(police);
1da177e4 LT	255	return err;
	256	}
	257
	258	static int tcf_act_police_cleanup(struct tc_action *a, int bind)
	259	{
e9ce1cd3	260	struct tcf_police *p = a->priv;
fb1d598d WC	261	if (p)
	262	return tcf_hash_release(&p->common, bind, &police_hash_info);
	263	return 0;
1da177e4 LT	264	}
1da177e4 LT	265
dc7f9f6e	266	static int tcf_act_police(struct sk_buff skb, const struct tc_action a,
10297b99	267	struct tcf_result *res)
1da177e4	268	{
e9ce1cd3	269	struct tcf_police *police = a->priv;
c6d14ff1 JP	270	s64 now;
	271	s64 toks;
	272	s64 ptoks = 0;
1da177e4	273
e9ce1cd3	274	spin_lock(&police->tcf_lock);
1da177e4	275
bfe0d029	276	bstats_update(&police->tcf_bstats, skb);
1da177e4	277
e9ce1cd3 DM	278	if (police->tcfp_ewma_rate &&
	279	police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
	280	police->tcf_qstats.overlimits++;
b9647580 JP	281	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	282	police->tcf_qstats.drops++;
e9ce1cd3 DM	283	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	284	return police->tcf_action;
1da177e4	285	}
1da177e4	286
0abf77e5	287	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
c6d14ff1	288	if (!police->rate_present) {
e9ce1cd3 DM	289	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	290	return police->tcfp_result;
1da177e4 LT	291	}
1da177e4 LT	292
c6d14ff1 JP	293	now = ktime_to_ns(ktime_get());
	294	toks = min_t(s64, now - police->tcfp_t_c,
	295	police->tcfp_burst);
	296	if (police->peak_present) {
e9ce1cd3	297	ptoks = toks + police->tcfp_ptoks;
c6d14ff1 JP	298	if (ptoks > police->tcfp_mtu_ptoks)
	299	ptoks = police->tcfp_mtu_ptoks;
	300	ptoks -= (s64) psched_l2t_ns(&police->peak,
	301	qdisc_pkt_len(skb));
1da177e4	302	}
e9ce1cd3	303	toks += police->tcfp_toks;
c6d14ff1	304	if (toks > police->tcfp_burst)
e9ce1cd3	305	toks = police->tcfp_burst;
c6d14ff1	306	toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb));
1da177e4	307	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	308	police->tcfp_t_c = now;
	309	police->tcfp_toks = toks;
	310	police->tcfp_ptoks = ptoks;
	311	spin_unlock(&police->tcf_lock);
	312	return police->tcfp_result;
1da177e4 LT	313	}
	314	}
	315
e9ce1cd3	316	police->tcf_qstats.overlimits++;
b9647580 JP	317	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	318	police->tcf_qstats.drops++;
e9ce1cd3 DM	319	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	320	return police->tcf_action;
1da177e4 LT	321	}
	322
	323	static int
	324	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	325	{
27a884dc	326	unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3	327	struct tcf_police *police = a->priv;
0f04cfd0 JM	328	struct tc_police opt = {
	329	.index = police->tcf_index,
	330	.action = police->tcf_action,
	331	.mtu = police->tcfp_mtu,
c6d14ff1	332	.burst = PSCHED_NS2TICKS(police->tcfp_burst),
0f04cfd0 JM	333	.refcnt = police->tcf_refcnt - ref,
	334	.bindcnt = police->tcf_bindcnt - bind,
	335	};
	336
c6d14ff1	337	if (police->rate_present)
01cb71d2	338	psched_ratecfg_getrate(&opt.rate, &police->rate);
c6d14ff1	339	if (police->peak_present)
01cb71d2	340	psched_ratecfg_getrate(&opt.peakrate, &police->peak);
1b34ec43 DM	341	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
	342	goto nla_put_failure;
	343	if (police->tcfp_result &&
	344	nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
	345	goto nla_put_failure;
	346	if (police->tcfp_ewma_rate &&
	347	nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
	348	goto nla_put_failure;
1da177e4 LT	349	return skb->len;
1da177e4 LT	350
7ba699c6	351	nla_put_failure:
dc5fc579	352	nlmsg_trim(skb, b);
1da177e4 LT	353	return -1;
	354	}
	355
	356	MODULE_AUTHOR("Alexey Kuznetsov");
	357	MODULE_DESCRIPTION("Policing actions");
	358	MODULE_LICENSE("GPL");
	359
	360	static struct tc_action_ops act_police_ops = {
	361	.kind = "police",
e9ce1cd3	362	.hinfo = &police_hash_info,
1da177e4	363	.type = TCA_ID_POLICE,
1da177e4 LT	364	.owner = THIS_MODULE,
	365	.act = tcf_act_police,
	366	.dump = tcf_act_police_dump,
	367	.cleanup = tcf_act_police_cleanup,
1da177e4	368	.init = tcf_act_police_locate,
83b950c8	369	.walk = tcf_act_police_walker
1da177e4 LT	370	};
	371
	372	static int __init
	373	police_init_module(void)
	374	{
568a153a	375	int err = tcf_hashinfo_init(&police_hash_info, POL_TAB_MASK);
369ba567 WC	376	if (err)
	377	return err;
	378	err = tcf_register_action(&act_police_ops);
	379	if (err)
	380	tcf_hashinfo_destroy(&police_hash_info);
	381	return err;
1da177e4 LT	382	}
	383
	384	static void __exit
	385	police_cleanup_module(void)
	386	{
369ba567	387	tcf_hashinfo_destroy(&police_hash_info);
1da177e4 LT	388	tcf_unregister_action(&act_police_ops);
	389	}
	390
	391	module_init(police_init_module);
	392	module_exit(police_cleanup_module);