[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 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 tcf_hashinfo *hinfo = a->ops->hinfo;
	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(&hinfo->lock);

	s_i = cb->args[0];

	for (i = 0; i < (POL_TAB_MASK + 1); i++) {
		head = &hinfo->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(&hinfo->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;
	struct tcf_hashinfo *hinfo = a->ops->hinfo;
	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, hinfo);
		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(a->ops->hinfo);
	h = tcf_hash(police->tcf_index, POL_TAB_MASK);
	spin_lock_bh(&hinfo->lock);
	hlist_add_head(&police->tcf_head, &hinfo->htab[h]);
	spin_unlock_bh(&hinfo->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	{
c779f7af	62	struct tcf_hashinfo *hinfo = a->ops->hinfo;
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
c779f7af	68	spin_lock_bh(&hinfo->lock);
1da177e4 LT	69
	70	s_i = cb->args[0];
	71
e9ce1cd3	72	for (i = 0; i < (POL_TAB_MASK + 1); i++) {
c779f7af	73	head = &hinfo->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:
c779f7af	98	spin_unlock_bh(&hinfo->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
53b2bf3f PM	108	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	109	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	110	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	111	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	112	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	113	};
	114
c1b52739 BL	115	static int tcf_act_police_locate(struct net net, struct nlattr nla,
	116	struct nlattr est, struct tc_action a,
	117	int ovr, int bind)
1da177e4	118	{
cc7ec456	119	unsigned int h;
1da177e4	120	int ret = 0, err;
7ba699c6	121	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	122	struct tc_police *parm;
e9ce1cd3	123	struct tcf_police *police;
1da177e4	124	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
c779f7af	125	struct tcf_hashinfo *hinfo = a->ops->hinfo;
1e9b3d53	126	int size;
1da177e4	127
cee63723	128	if (nla == NULL)
1da177e4 LT	129	return -EINVAL;
1da177e4 LT	130
53b2bf3f	131	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
cee63723 PM	132	if (err < 0)
	133	return err;
	134
7ba699c6	135	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	136	return -EINVAL;
7ba699c6	137	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	138	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	139	return -EINVAL;
7ba699c6	140	parm = nla_data(tb[TCA_POLICE_TBF]);
1da177e4	141
e9ce1cd3 DM	142	if (parm->index) {
	143	struct tcf_common *pc;
	144
c779f7af	145	pc = tcf_hash_lookup(parm->index, hinfo);
e9ce1cd3 DM	146	if (pc != NULL) {
	147	a->priv = pc;
	148	police = to_police(pc);
	149	if (bind) {
	150	police->tcf_bindcnt += 1;
	151	police->tcf_refcnt += 1;
1a29321e	152	return 0;
e9ce1cd3 DM	153	}
	154	if (ovr)
	155	goto override;
1a29321e JHS	156	/* not replacing */
1a29321e JHS	157	return -EEXIST;
1da177e4	158	}
1da177e4 LT	159	}
1da177e4 LT	160
e9ce1cd3 DM	161	police = kzalloc(sizeof(*police), GFP_KERNEL);
e9ce1cd3 DM	162	if (police == NULL)
1da177e4	163	return -ENOMEM;
1da177e4	164	ret = ACT_P_CREATED;
e9ce1cd3 DM	165	police->tcf_refcnt = 1;
e9ce1cd3 DM	166	spin_lock_init(&police->tcf_lock);
1da177e4	167	if (bind)
e9ce1cd3	168	police->tcf_bindcnt = 1;
1da177e4 LT	169	override:
	170	if (parm->rate.rate) {
	171	err = -ENOMEM;
7ba699c6	172	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
1da177e4 LT	173	if (R_tab == NULL)
1da177e4 LT	174	goto failure;
c1b56878	175
1da177e4 LT	176	if (parm->peakrate.rate) {
1da177e4 LT	177	P_tab = qdisc_get_rtab(&parm->peakrate,
7ba699c6	178	tb[TCA_POLICE_PEAKRATE]);
71bcb09a	179	if (P_tab == NULL)
1da177e4	180	goto failure;
1da177e4 LT	181	}
1da177e4 LT	182	}
71bcb09a	183
e9ce1cd3	184	spin_lock_bh(&police->tcf_lock);
71bcb09a SH	185	if (est) {
	186	err = gen_replace_estimator(&police->tcf_bstats,
	187	&police->tcf_rate_est,
	188	&police->tcf_lock, est);
	189	if (err)
	190	goto failure_unlock;
a883bf56 JP	191	} else if (tb[TCA_POLICE_AVRATE] &&
	192	(ret == ACT_P_CREATED \|\|
	193	!gen_estimator_active(&police->tcf_bstats,
	194	&police->tcf_rate_est))) {
	195	err = -EINVAL;
	196	goto failure_unlock;
71bcb09a SH	197	}
	198
	199	/* No failure allowed after this point */
c6d14ff1 JP	200	police->tcfp_mtu = parm->mtu;
	201	if (police->tcfp_mtu == 0) {
	202	police->tcfp_mtu = ~0;
	203	if (R_tab)
	204	police->tcfp_mtu = 255 << R_tab->rate.cell_log;
	205	}
	206	if (R_tab) {
	207	police->rate_present = true;
3e1e3aae	208	psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0);
c6d14ff1 JP	209	qdisc_put_rtab(R_tab);
	210	} else {
	211	police->rate_present = false;
1da177e4	212	}
c6d14ff1 JP	213	if (P_tab) {
c6d14ff1 JP	214	police->peak_present = true;
3e1e3aae	215	psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0);
c6d14ff1 JP	216	qdisc_put_rtab(P_tab);
	217	} else {
	218	police->peak_present = false;
1da177e4 LT	219	}
1da177e4 LT	220
7ba699c6	221	if (tb[TCA_POLICE_RESULT])
1587bac4	222	police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
c6d14ff1 JP	223	police->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
	224	police->tcfp_toks = police->tcfp_burst;
	225	if (police->peak_present) {
	226	police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak,
	227	police->tcfp_mtu);
	228	police->tcfp_ptoks = police->tcfp_mtu_ptoks;
1da177e4	229	}
e9ce1cd3	230	police->tcf_action = parm->action;
1da177e4	231
7ba699c6	232	if (tb[TCA_POLICE_AVRATE])
1587bac4	233	police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	234
e9ce1cd3	235	spin_unlock_bh(&police->tcf_lock);
1da177e4 LT	236	if (ret != ACT_P_CREATED)
	237	return ret;
	238
c6d14ff1	239	police->tcfp_t_c = ktime_to_ns(ktime_get());
e9ce1cd3	240	police->tcf_index = parm->index ? parm->index :
c779f7af	241	tcf_hash_new_index(a->ops->hinfo);
e9ce1cd3	242	h = tcf_hash(police->tcf_index, POL_TAB_MASK);
c779f7af WC	243	spin_lock_bh(&hinfo->lock);
	244	hlist_add_head(&police->tcf_head, &hinfo->htab[h]);
	245	spin_unlock_bh(&hinfo->lock);
1da177e4	246
e9ce1cd3	247	a->priv = police;
1da177e4 LT	248	return ret;
1da177e4 LT	249
71bcb09a SH	250	failure_unlock:
71bcb09a SH	251	spin_unlock_bh(&police->tcf_lock);
1da177e4	252	failure:
3b69a4c9 YY	253	qdisc_put_rtab(P_tab);
3b69a4c9 YY	254	qdisc_put_rtab(R_tab);
1da177e4	255	if (ret == ACT_P_CREATED)
e9ce1cd3	256	kfree(police);
1da177e4 LT	257	return err;
	258	}
	259
	260	static int tcf_act_police_cleanup(struct tc_action *a, int bind)
	261	{
e9ce1cd3	262	struct tcf_police *p = a->priv;
fb1d598d WC	263	if (p)
	264	return tcf_hash_release(&p->common, bind, &police_hash_info);
	265	return 0;
1da177e4 LT	266	}
1da177e4 LT	267
dc7f9f6e	268	static int tcf_act_police(struct sk_buff skb, const struct tc_action a,
10297b99	269	struct tcf_result *res)
1da177e4	270	{
e9ce1cd3	271	struct tcf_police *police = a->priv;
c6d14ff1 JP	272	s64 now;
	273	s64 toks;
	274	s64 ptoks = 0;
1da177e4	275
e9ce1cd3	276	spin_lock(&police->tcf_lock);
1da177e4	277
bfe0d029	278	bstats_update(&police->tcf_bstats, skb);
1da177e4	279
e9ce1cd3 DM	280	if (police->tcfp_ewma_rate &&
	281	police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
	282	police->tcf_qstats.overlimits++;
b9647580 JP	283	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	284	police->tcf_qstats.drops++;
e9ce1cd3 DM	285	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	286	return police->tcf_action;
1da177e4	287	}
1da177e4	288
0abf77e5	289	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
c6d14ff1	290	if (!police->rate_present) {
e9ce1cd3 DM	291	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	292	return police->tcfp_result;
1da177e4 LT	293	}
1da177e4 LT	294
c6d14ff1 JP	295	now = ktime_to_ns(ktime_get());
	296	toks = min_t(s64, now - police->tcfp_t_c,
	297	police->tcfp_burst);
	298	if (police->peak_present) {
e9ce1cd3	299	ptoks = toks + police->tcfp_ptoks;
c6d14ff1 JP	300	if (ptoks > police->tcfp_mtu_ptoks)
	301	ptoks = police->tcfp_mtu_ptoks;
	302	ptoks -= (s64) psched_l2t_ns(&police->peak,
	303	qdisc_pkt_len(skb));
1da177e4	304	}
e9ce1cd3	305	toks += police->tcfp_toks;
c6d14ff1	306	if (toks > police->tcfp_burst)
e9ce1cd3	307	toks = police->tcfp_burst;
c6d14ff1	308	toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb));
1da177e4	309	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	310	police->tcfp_t_c = now;
	311	police->tcfp_toks = toks;
	312	police->tcfp_ptoks = ptoks;
	313	spin_unlock(&police->tcf_lock);
	314	return police->tcfp_result;
1da177e4 LT	315	}
	316	}
	317
e9ce1cd3	318	police->tcf_qstats.overlimits++;
b9647580 JP	319	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	320	police->tcf_qstats.drops++;
e9ce1cd3 DM	321	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	322	return police->tcf_action;
1da177e4 LT	323	}
	324
	325	static int
	326	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	327	{
27a884dc	328	unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3	329	struct tcf_police *police = a->priv;
0f04cfd0 JM	330	struct tc_police opt = {
	331	.index = police->tcf_index,
	332	.action = police->tcf_action,
	333	.mtu = police->tcfp_mtu,
c6d14ff1	334	.burst = PSCHED_NS2TICKS(police->tcfp_burst),
0f04cfd0 JM	335	.refcnt = police->tcf_refcnt - ref,
	336	.bindcnt = police->tcf_bindcnt - bind,
	337	};
	338
c6d14ff1	339	if (police->rate_present)
01cb71d2	340	psched_ratecfg_getrate(&opt.rate, &police->rate);
c6d14ff1	341	if (police->peak_present)
01cb71d2	342	psched_ratecfg_getrate(&opt.peakrate, &police->peak);
1b34ec43 DM	343	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
	344	goto nla_put_failure;
	345	if (police->tcfp_result &&
	346	nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
	347	goto nla_put_failure;
	348	if (police->tcfp_ewma_rate &&
	349	nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
	350	goto nla_put_failure;
1da177e4 LT	351	return skb->len;
1da177e4 LT	352
7ba699c6	353	nla_put_failure:
dc5fc579	354	nlmsg_trim(skb, b);
1da177e4 LT	355	return -1;
	356	}
	357
	358	MODULE_AUTHOR("Alexey Kuznetsov");
	359	MODULE_DESCRIPTION("Policing actions");
	360	MODULE_LICENSE("GPL");
	361
	362	static struct tc_action_ops act_police_ops = {
	363	.kind = "police",
e9ce1cd3	364	.hinfo = &police_hash_info,
1da177e4	365	.type = TCA_ID_POLICE,
1da177e4 LT	366	.owner = THIS_MODULE,
	367	.act = tcf_act_police,
	368	.dump = tcf_act_police_dump,
	369	.cleanup = tcf_act_police_cleanup,
1da177e4	370	.init = tcf_act_police_locate,
83b950c8	371	.walk = tcf_act_police_walker
1da177e4 LT	372	};
	373
	374	static int __init
	375	police_init_module(void)
	376	{
568a153a	377	int err = tcf_hashinfo_init(&police_hash_info, POL_TAB_MASK);
369ba567 WC	378	if (err)
	379	return err;
	380	err = tcf_register_action(&act_police_ops);
	381	if (err)
	382	tcf_hashinfo_destroy(&police_hash_info);
	383	return err;
1da177e4 LT	384	}
	385
	386	static void __exit
	387	police_cleanup_module(void)
	388	{
369ba567	389	tcf_hashinfo_destroy(&police_hash_info);
1da177e4 LT	390	tcf_unregister_action(&act_police_ops);
	391	}
	392
	393	module_init(police_init_module);
	394	module_exit(police_cleanup_module);