[mirror_ubuntu-bionic-kernel.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 u32 police_idx_gen;
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 void tcf_police_destroy(struct tcf_police *p)
{
	spin_lock_bh(&police_hash_info.lock);
	hlist_del(&p->tcf_head);
	spin_unlock_bh(&police_hash_info.lock);
	gen_kill_estimator(&p->tcf_bstats,
			   &p->tcf_rate_est);
	/*
	 * gen_estimator est_timer() might access p->tcf_lock
	 * or bstats, wait a RCU grace period before freeing p
	 */
	kfree_rcu(p, tcf_rcu);
}

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 */
	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_idx_gen, &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:
	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;
	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,
	.capab		=	TCA_CAP_NONE,
	.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+1);
	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
e9ce1cd3	44	static u32 police_idx_gen;
369ba567	45	static struct tcf_hashinfo police_hash_info;
1da177e4	46
1e9b3d53	47	/* old policer structure from before tc actions */
cc7ec456	48	struct tc_police_compat {
1e9b3d53 PM	49	u32 index;
	50	int action;
	51	u32 limit;
	52	u32 burst;
	53	u32 mtu;
	54	struct tc_ratespec rate;
	55	struct tc_ratespec peakrate;
	56	};
	57
e9ce1cd3	58	/* Each policer is serialized by its individual spinlock */
1da177e4	59
83b950c8	60	static int tcf_act_police_walker(struct sk_buff skb, struct netlink_callback cb,
10297b99	61	int type, struct tc_action *a)
1da177e4	62	{
89819dc0	63	struct hlist_head *head;
e9ce1cd3	64	struct tcf_common *p;
1da177e4	65	int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
4b3550ef	66	struct nlattr *nest;
1da177e4	67
89819dc0	68	spin_lock_bh(&police_hash_info.lock);
1da177e4 LT	69
	70	s_i = cb->args[0];
	71
e9ce1cd3	72	for (i = 0; i < (POL_TAB_MASK + 1); i++) {
89819dc0	73	head = &police_hash_info.htab[tcf_hash(i, POL_TAB_MASK)];
1da177e4	74
89819dc0	75	hlist_for_each_entry_rcu(p, head, tcfc_head) {
1da177e4 LT	76	index++;
	77	if (index < s_i)
	78	continue;
	79	a->priv = p;
	80	a->order = index;
4b3550ef PM	81	nest = nla_nest_start(skb, a->order);
	82	if (nest == NULL)
	83	goto nla_put_failure;
1da177e4 LT	84	if (type == RTM_DELACTION)
	85	err = tcf_action_dump_1(skb, a, 0, 1);
	86	else
	87	err = tcf_action_dump_1(skb, a, 0, 0);
	88	if (err < 0) {
	89	index--;
4b3550ef	90	nla_nest_cancel(skb, nest);
1da177e4 LT	91	goto done;
1da177e4 LT	92	}
4b3550ef	93	nla_nest_end(skb, nest);
1da177e4 LT	94	n_i++;
	95	}
	96	}
	97	done:
89819dc0	98	spin_unlock_bh(&police_hash_info.lock);
1da177e4 LT	99	if (n_i)
	100	cb->args[0] += n_i;
	101	return n_i;
	102
7ba699c6	103	nla_put_failure:
4b3550ef	104	nla_nest_cancel(skb, nest);
1da177e4 LT	105	goto done;
1da177e4 LT	106	}
1da177e4	107
c3bc7cff	108	static void tcf_police_destroy(struct tcf_police *p)
1da177e4	109	{
89819dc0 WC	110	spin_lock_bh(&police_hash_info.lock);
	111	hlist_del(&p->tcf_head);
	112	spin_unlock_bh(&police_hash_info.lock);
	113	gen_kill_estimator(&p->tcf_bstats,
	114	&p->tcf_rate_est);
	115	/*
	116	* gen_estimator est_timer() might access p->tcf_lock
	117	* or bstats, wait a RCU grace period before freeing p
	118	*/
	119	kfree_rcu(p, tcf_rcu);
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
c1b52739 BL	129	static int tcf_act_police_locate(struct net net, struct nlattr nla,
	130	struct nlattr est, struct tc_action a,
	131	int ovr, int bind)
1da177e4	132	{
cc7ec456	133	unsigned int h;
1da177e4	134	int ret = 0, err;
7ba699c6	135	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	136	struct tc_police *parm;
e9ce1cd3	137	struct tcf_police *police;
1da177e4	138	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
1e9b3d53	139	int size;
1da177e4	140
cee63723	141	if (nla == NULL)
1da177e4 LT	142	return -EINVAL;
1da177e4 LT	143
53b2bf3f	144	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
cee63723 PM	145	if (err < 0)
	146	return err;
	147
7ba699c6	148	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	149	return -EINVAL;
7ba699c6	150	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	151	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	152	return -EINVAL;
7ba699c6	153	parm = nla_data(tb[TCA_POLICE_TBF]);
1da177e4	154
e9ce1cd3 DM	155	if (parm->index) {
	156	struct tcf_common *pc;
	157
	158	pc = tcf_hash_lookup(parm->index, &police_hash_info);
	159	if (pc != NULL) {
	160	a->priv = pc;
	161	police = to_police(pc);
	162	if (bind) {
	163	police->tcf_bindcnt += 1;
	164	police->tcf_refcnt += 1;
	165	}
	166	if (ovr)
	167	goto override;
	168	return ret;
1da177e4	169	}
1da177e4 LT	170	}
1da177e4 LT	171
e9ce1cd3 DM	172	police = kzalloc(sizeof(*police), GFP_KERNEL);
e9ce1cd3 DM	173	if (police == NULL)
1da177e4	174	return -ENOMEM;
1da177e4	175	ret = ACT_P_CREATED;
e9ce1cd3 DM	176	police->tcf_refcnt = 1;
e9ce1cd3 DM	177	spin_lock_init(&police->tcf_lock);
1da177e4	178	if (bind)
e9ce1cd3	179	police->tcf_bindcnt = 1;
1da177e4 LT	180	override:
	181	if (parm->rate.rate) {
	182	err = -ENOMEM;
7ba699c6	183	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
1da177e4 LT	184	if (R_tab == NULL)
1da177e4 LT	185	goto failure;
c1b56878	186
1da177e4 LT	187	if (parm->peakrate.rate) {
1da177e4 LT	188	P_tab = qdisc_get_rtab(&parm->peakrate,
7ba699c6	189	tb[TCA_POLICE_PEAKRATE]);
71bcb09a	190	if (P_tab == NULL)
1da177e4	191	goto failure;
1da177e4 LT	192	}
1da177e4 LT	193	}
71bcb09a	194
e9ce1cd3	195	spin_lock_bh(&police->tcf_lock);
71bcb09a SH	196	if (est) {
	197	err = gen_replace_estimator(&police->tcf_bstats,
	198	&police->tcf_rate_est,
	199	&police->tcf_lock, est);
	200	if (err)
	201	goto failure_unlock;
a883bf56 JP	202	} else if (tb[TCA_POLICE_AVRATE] &&
	203	(ret == ACT_P_CREATED \|\|
	204	!gen_estimator_active(&police->tcf_bstats,
	205	&police->tcf_rate_est))) {
	206	err = -EINVAL;
	207	goto failure_unlock;
71bcb09a SH	208	}
	209
	210	/* No failure allowed after this point */
c6d14ff1 JP	211	police->tcfp_mtu = parm->mtu;
	212	if (police->tcfp_mtu == 0) {
	213	police->tcfp_mtu = ~0;
	214	if (R_tab)
	215	police->tcfp_mtu = 255 << R_tab->rate.cell_log;
	216	}
	217	if (R_tab) {
	218	police->rate_present = true;
3e1e3aae	219	psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0);
c6d14ff1 JP	220	qdisc_put_rtab(R_tab);
	221	} else {
	222	police->rate_present = false;
1da177e4	223	}
c6d14ff1 JP	224	if (P_tab) {
c6d14ff1 JP	225	police->peak_present = true;
3e1e3aae	226	psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0);
c6d14ff1 JP	227	qdisc_put_rtab(P_tab);
	228	} else {
	229	police->peak_present = false;
1da177e4 LT	230	}
1da177e4 LT	231
7ba699c6	232	if (tb[TCA_POLICE_RESULT])
1587bac4	233	police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
c6d14ff1 JP	234	police->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
	235	police->tcfp_toks = police->tcfp_burst;
	236	if (police->peak_present) {
	237	police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak,
	238	police->tcfp_mtu);
	239	police->tcfp_ptoks = police->tcfp_mtu_ptoks;
1da177e4	240	}
e9ce1cd3	241	police->tcf_action = parm->action;
1da177e4	242
7ba699c6	243	if (tb[TCA_POLICE_AVRATE])
1587bac4	244	police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	245
e9ce1cd3	246	spin_unlock_bh(&police->tcf_lock);
1da177e4 LT	247	if (ret != ACT_P_CREATED)
	248	return ret;
	249
c6d14ff1	250	police->tcfp_t_c = ktime_to_ns(ktime_get());
e9ce1cd3 DM	251	police->tcf_index = parm->index ? parm->index :
	252	tcf_hash_new_index(&police_idx_gen, &police_hash_info);
	253	h = tcf_hash(police->tcf_index, POL_TAB_MASK);
89819dc0 WC	254	spin_lock_bh(&police_hash_info.lock);
	255	hlist_add_head(&police->tcf_head, &police_hash_info.htab[h]);
	256	spin_unlock_bh(&police_hash_info.lock);
1da177e4	257
e9ce1cd3	258	a->priv = police;
1da177e4 LT	259	return ret;
1da177e4 LT	260
71bcb09a SH	261	failure_unlock:
71bcb09a SH	262	spin_unlock_bh(&police->tcf_lock);
1da177e4	263	failure:
71bcb09a SH	264	if (P_tab)
	265	qdisc_put_rtab(P_tab);
	266	if (R_tab)
	267	qdisc_put_rtab(R_tab);
1da177e4	268	if (ret == ACT_P_CREATED)
e9ce1cd3	269	kfree(police);
1da177e4 LT	270	return err;
	271	}
	272
	273	static int tcf_act_police_cleanup(struct tc_action *a, int bind)
	274	{
e9ce1cd3	275	struct tcf_police *p = a->priv;
c3bc7cff	276	int ret = 0;
1da177e4	277
c3bc7cff PM	278	if (p != NULL) {
	279	if (bind)
	280	p->tcf_bindcnt--;
	281
	282	p->tcf_refcnt--;
	283	if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) {
	284	tcf_police_destroy(p);
	285	ret = 1;
	286	}
	287	}
	288	return ret;
1da177e4 LT	289	}
1da177e4 LT	290
dc7f9f6e	291	static int tcf_act_police(struct sk_buff skb, const struct tc_action a,
10297b99	292	struct tcf_result *res)
1da177e4	293	{
e9ce1cd3	294	struct tcf_police *police = a->priv;
c6d14ff1 JP	295	s64 now;
	296	s64 toks;
	297	s64 ptoks = 0;
1da177e4	298
e9ce1cd3	299	spin_lock(&police->tcf_lock);
1da177e4	300
bfe0d029	301	bstats_update(&police->tcf_bstats, skb);
1da177e4	302
e9ce1cd3 DM	303	if (police->tcfp_ewma_rate &&
	304	police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
	305	police->tcf_qstats.overlimits++;
b9647580 JP	306	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	307	police->tcf_qstats.drops++;
e9ce1cd3 DM	308	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	309	return police->tcf_action;
1da177e4	310	}
1da177e4	311
0abf77e5	312	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
c6d14ff1	313	if (!police->rate_present) {
e9ce1cd3 DM	314	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	315	return police->tcfp_result;
1da177e4 LT	316	}
1da177e4 LT	317
c6d14ff1 JP	318	now = ktime_to_ns(ktime_get());
	319	toks = min_t(s64, now - police->tcfp_t_c,
	320	police->tcfp_burst);
	321	if (police->peak_present) {
e9ce1cd3	322	ptoks = toks + police->tcfp_ptoks;
c6d14ff1 JP	323	if (ptoks > police->tcfp_mtu_ptoks)
	324	ptoks = police->tcfp_mtu_ptoks;
	325	ptoks -= (s64) psched_l2t_ns(&police->peak,
	326	qdisc_pkt_len(skb));
1da177e4	327	}
e9ce1cd3	328	toks += police->tcfp_toks;
c6d14ff1	329	if (toks > police->tcfp_burst)
e9ce1cd3	330	toks = police->tcfp_burst;
c6d14ff1	331	toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb));
1da177e4	332	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	333	police->tcfp_t_c = now;
	334	police->tcfp_toks = toks;
	335	police->tcfp_ptoks = ptoks;
	336	spin_unlock(&police->tcf_lock);
	337	return police->tcfp_result;
1da177e4 LT	338	}
	339	}
	340
e9ce1cd3	341	police->tcf_qstats.overlimits++;
b9647580 JP	342	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	343	police->tcf_qstats.drops++;
e9ce1cd3 DM	344	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	345	return police->tcf_action;
1da177e4 LT	346	}
	347
	348	static int
	349	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	350	{
27a884dc	351	unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3	352	struct tcf_police *police = a->priv;
0f04cfd0 JM	353	struct tc_police opt = {
	354	.index = police->tcf_index,
	355	.action = police->tcf_action,
	356	.mtu = police->tcfp_mtu,
c6d14ff1	357	.burst = PSCHED_NS2TICKS(police->tcfp_burst),
0f04cfd0 JM	358	.refcnt = police->tcf_refcnt - ref,
	359	.bindcnt = police->tcf_bindcnt - bind,
	360	};
	361
c6d14ff1	362	if (police->rate_present)
01cb71d2	363	psched_ratecfg_getrate(&opt.rate, &police->rate);
c6d14ff1	364	if (police->peak_present)
01cb71d2	365	psched_ratecfg_getrate(&opt.peakrate, &police->peak);
1b34ec43 DM	366	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
	367	goto nla_put_failure;
	368	if (police->tcfp_result &&
	369	nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
	370	goto nla_put_failure;
	371	if (police->tcfp_ewma_rate &&
	372	nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
	373	goto nla_put_failure;
1da177e4 LT	374	return skb->len;
1da177e4 LT	375
7ba699c6	376	nla_put_failure:
dc5fc579	377	nlmsg_trim(skb, b);
1da177e4 LT	378	return -1;
	379	}
	380
	381	MODULE_AUTHOR("Alexey Kuznetsov");
	382	MODULE_DESCRIPTION("Policing actions");
	383	MODULE_LICENSE("GPL");
	384
	385	static struct tc_action_ops act_police_ops = {
	386	.kind = "police",
e9ce1cd3	387	.hinfo = &police_hash_info,
1da177e4 LT	388	.type = TCA_ID_POLICE,
	389	.capab = TCA_CAP_NONE,
	390	.owner = THIS_MODULE,
	391	.act = tcf_act_police,
	392	.dump = tcf_act_police_dump,
	393	.cleanup = tcf_act_police_cleanup,
1da177e4	394	.init = tcf_act_police_locate,
83b950c8	395	.walk = tcf_act_police_walker
1da177e4 LT	396	};
	397
	398	static int __init
	399	police_init_module(void)
	400	{
369ba567 WC	401	int err = tcf_hashinfo_init(&police_hash_info, POL_TAB_MASK+1);
	402	if (err)
	403	return err;
	404	err = tcf_register_action(&act_police_ops);
	405	if (err)
	406	tcf_hashinfo_destroy(&police_hash_info);
	407	return err;
1da177e4 LT	408	}
	409
	410	static void __exit
	411	police_cleanup_module(void)
	412	{
369ba567	413	tcf_hashinfo_destroy(&police_hash_info);
1da177e4 LT	414	tcf_unregister_action(&act_police_ops);
	415	}
	416
	417	module_init(police_init_module);
	418	module_exit(police_cleanup_module);