[linux-2.6-block.git] / net / sched / act_police.c

/*
 * net/sched/act_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 tc_action	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) ((struct tcf_police *)pc)

#define POL_TAB_MASK     15

/* 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 police_net_id;
static struct tc_action_ops act_police_ops;

static int tcf_act_police_walker(struct net *net, struct sk_buff *skb,
				 struct netlink_callback *cb, int type,
				 const struct tc_action_ops *ops)
{
	struct tc_action_net *tn = net_generic(net, police_net_id);
	struct tcf_hashinfo *hinfo = tn->hinfo;
	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++) {
		struct hlist_head *head;
		struct tc_action *p;

		head = &hinfo->htab[tcf_hash(i, POL_TAB_MASK)];

		hlist_for_each_entry_rcu(p, head, tcfa_head) {
			index++;
			if (index < s_i)
				continue;
			nest = nla_nest_start(skb, index);
			if (nest == NULL)
				goto nla_put_failure;
			if (type == RTM_DELACTION)
				err = tcf_action_dump_1(skb, p, 0, 1);
			else
				err = tcf_action_dump_1(skb, p, 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_init(struct net *net, struct nlattr *nla,
			       struct nlattr *est, struct tc_action **a,
			       int ovr, int bind)
{
	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 tc_action_net *tn = net_generic(net, police_net_id);
	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) {
		if (tcf_hash_check(tn, parm->index, a, bind)) {
			if (ovr)
				goto override;
			/* not replacing */
			return -EEXIST;
		}
	} else {
		ret = tcf_hash_create(tn, parm->index, NULL, a,
				      &act_police_ops, bind, false);
		if (ret)
			return ret;
		ret = ACT_P_CREATED;
	}

override:
	police = to_police(*a);
	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, NULL,
					    &police->tcf_rate_est,
					    &police->tcf_lock,
					    NULL, 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_get_ns();
	tcf_hash_insert(tn, *a);

	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)
		tcf_hash_cleanup(*a, est);
	return err;
}

static int tcf_act_police(struct sk_buff *skb, const struct tc_action *a,
			  struct tcf_result *res)
{
	struct tcf_police *police = to_police(a);
	s64 now;
	s64 toks;
	s64 ptoks = 0;

	spin_lock(&police->tcf_lock);

	bstats_update(&police->tcf_bstats, skb);
	tcf_lastuse_update(&police->tcf_tm);

	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_get_ns();
		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 = to_police(a);
	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,
	};
	struct tcf_t t;

	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;

	t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install);
	t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse);
	t.firstuse = jiffies_to_clock_t(jiffies - police->tcf_tm.firstuse);
	t.expires = jiffies_to_clock_t(police->tcf_tm.expires);
	if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
		goto nla_put_failure;

	return skb->len;

nla_put_failure:
	nlmsg_trim(skb, b);
	return -1;
}

static int tcf_police_search(struct net *net, struct tc_action **a, u32 index)
{
	struct tc_action_net *tn = net_generic(net, police_net_id);

	return tcf_hash_search(tn, a, index);
}

MODULE_AUTHOR("Alexey Kuznetsov");
MODULE_DESCRIPTION("Policing actions");
MODULE_LICENSE("GPL");

static struct tc_action_ops act_police_ops = {
	.kind		=	"police",
	.type		=	TCA_ID_POLICE,
	.owner		=	THIS_MODULE,
	.act		=	tcf_act_police,
	.dump		=	tcf_act_police_dump,
	.init		=	tcf_act_police_init,
	.walk		=	tcf_act_police_walker,
	.lookup		=	tcf_police_search,
	.size		=	sizeof(struct tcf_police),
};

static __net_init int police_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, police_net_id);

	return tc_action_net_init(tn, &act_police_ops, POL_TAB_MASK);
}

static void __net_exit police_exit_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, police_net_id);

	tc_action_net_exit(tn);
}

static struct pernet_operations police_net_ops = {
	.init = police_init_net,
	.exit = police_exit_net,
	.id   = &police_net_id,
	.size = sizeof(struct tc_action_net),
};

static int __init
police_init_module(void)
{
	return tcf_register_action(&act_police_ops, &police_net_ops);
}

static void __exit
police_cleanup_module(void)
{
	tcf_unregister_action(&act_police_ops, &police_net_ops);
}

module_init(police_init_module);
module_exit(police_cleanup_module);
Commit	Line	Data
1da177e4	1	/*
0c6965dd	2	* net/sched/act_police.c Input police filter
1da177e4 LT	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	25	struct tcf_police {
ec0595cc	26	struct tc_action common;
0e243218 JP	27	int tcfp_result;
0e243218 JP	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	39	};
a85a970a WC	40
a85a970a WC	41	#define to_police(pc) ((struct tcf_police *)pc)
0e243218	42
e9ce1cd3	43	#define POL_TAB_MASK 15
1da177e4	44
1e9b3d53	45	/* old policer structure from before tc actions */
cc7ec456	46	struct tc_police_compat {
1e9b3d53 PM	47	u32 index;
	48	int action;
	49	u32 limit;
	50	u32 burst;
	51	u32 mtu;
	52	struct tc_ratespec rate;
	53	struct tc_ratespec peakrate;
	54	};
	55
e9ce1cd3	56	/* Each policer is serialized by its individual spinlock */
1da177e4	57
ddf97ccd	58	static int police_net_id;
a85a970a	59	static struct tc_action_ops act_police_ops;
ddf97ccd WC	60
	61	static int tcf_act_police_walker(struct net net, struct sk_buff skb,
	62	struct netlink_callback *cb, int type,
a85a970a	63	const struct tc_action_ops *ops)
1da177e4	64	{
ddf97ccd WC	65	struct tc_action_net *tn = net_generic(net, police_net_id);
ddf97ccd WC	66	struct tcf_hashinfo *hinfo = tn->hinfo;
1da177e4	67	int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
4b3550ef	68	struct nlattr *nest;
1da177e4	69
c779f7af	70	spin_lock_bh(&hinfo->lock);
1da177e4 LT	71
	72	s_i = cb->args[0];
	73
e9ce1cd3	74	for (i = 0; i < (POL_TAB_MASK + 1); i++) {
a85a970a	75	struct hlist_head *head;
ec0595cc	76	struct tc_action *p;
a85a970a	77
c779f7af	78	head = &hinfo->htab[tcf_hash(i, POL_TAB_MASK)];
1da177e4	79
ec0595cc	80	hlist_for_each_entry_rcu(p, head, tcfa_head) {
1da177e4 LT	81	index++;
	82	if (index < s_i)
	83	continue;
a85a970a	84	nest = nla_nest_start(skb, index);
4b3550ef PM	85	if (nest == NULL)
4b3550ef PM	86	goto nla_put_failure;
1da177e4	87	if (type == RTM_DELACTION)
ec0595cc	88	err = tcf_action_dump_1(skb, p, 0, 1);
1da177e4	89	else
ec0595cc	90	err = tcf_action_dump_1(skb, p, 0, 0);
1da177e4 LT	91	if (err < 0) {
1da177e4 LT	92	index--;
4b3550ef	93	nla_nest_cancel(skb, nest);
1da177e4 LT	94	goto done;
1da177e4 LT	95	}
4b3550ef	96	nla_nest_end(skb, nest);
1da177e4 LT	97	n_i++;
	98	}
	99	}
	100	done:
c779f7af	101	spin_unlock_bh(&hinfo->lock);
1da177e4 LT	102	if (n_i)
	103	cb->args[0] += n_i;
	104	return n_i;
	105
7ba699c6	106	nla_put_failure:
4b3550ef	107	nla_nest_cancel(skb, nest);
1da177e4 LT	108	goto done;
1da177e4 LT	109	}
1da177e4	110
53b2bf3f PM	111	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	112	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	113	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	114	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	115	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	116	};
	117
d9fa17ef	118	static int tcf_act_police_init(struct net net, struct nlattr nla,
a85a970a	119	struct nlattr est, struct tc_action *a,
d9fa17ef	120	int ovr, int bind)
1da177e4	121	{
1da177e4	122	int ret = 0, err;
7ba699c6	123	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	124	struct tc_police *parm;
e9ce1cd3	125	struct tcf_police *police;
1da177e4	126	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
ddf97ccd	127	struct tc_action_net *tn = net_generic(net, police_net_id);
1e9b3d53	128	int size;
1da177e4	129
cee63723	130	if (nla == NULL)
1da177e4 LT	131	return -EINVAL;
1da177e4 LT	132
53b2bf3f	133	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
cee63723 PM	134	if (err < 0)
	135	return err;
	136
7ba699c6	137	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	138	return -EINVAL;
7ba699c6	139	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	140	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	141	return -EINVAL;
7ba699c6	142	parm = nla_data(tb[TCA_POLICE_TBF]);
1da177e4	143
e9ce1cd3	144	if (parm->index) {
a85a970a	145	if (tcf_hash_check(tn, parm->index, a, bind)) {
e9ce1cd3 DM	146	if (ovr)
e9ce1cd3 DM	147	goto override;
1a29321e JHS	148	/* not replacing */
1a29321e JHS	149	return -EEXIST;
1da177e4	150	}
a03e6fe5 WC	151	} else {
a03e6fe5 WC	152	ret = tcf_hash_create(tn, parm->index, NULL, a,
a85a970a	153	&act_police_ops, bind, false);
a03e6fe5 WC	154	if (ret)
	155	return ret;
	156	ret = ACT_P_CREATED;
1da177e4 LT	157	}
1da177e4 LT	158
1da177e4	159	override:
a85a970a	160	police = to_police(*a);
1da177e4 LT	161	if (parm->rate.rate) {
1da177e4 LT	162	err = -ENOMEM;
7ba699c6	163	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
1da177e4 LT	164	if (R_tab == NULL)
1da177e4 LT	165	goto failure;
c1b56878	166
1da177e4 LT	167	if (parm->peakrate.rate) {
1da177e4 LT	168	P_tab = qdisc_get_rtab(&parm->peakrate,
7ba699c6	169	tb[TCA_POLICE_PEAKRATE]);
71bcb09a	170	if (P_tab == NULL)
1da177e4	171	goto failure;
1da177e4 LT	172	}
1da177e4 LT	173	}
71bcb09a	174
e9ce1cd3	175	spin_lock_bh(&police->tcf_lock);
71bcb09a	176	if (est) {
22e0f8b9	177	err = gen_replace_estimator(&police->tcf_bstats, NULL,
71bcb09a	178	&police->tcf_rate_est,
edb09eb1 ED	179	&police->tcf_lock,
edb09eb1 ED	180	NULL, est);
71bcb09a SH	181	if (err)
71bcb09a SH	182	goto failure_unlock;
a883bf56 JP	183	} else if (tb[TCA_POLICE_AVRATE] &&
	184	(ret == ACT_P_CREATED \|\|
	185	!gen_estimator_active(&police->tcf_bstats,
	186	&police->tcf_rate_est))) {
	187	err = -EINVAL;
	188	goto failure_unlock;
71bcb09a SH	189	}
	190
	191	/* No failure allowed after this point */
c6d14ff1 JP	192	police->tcfp_mtu = parm->mtu;
	193	if (police->tcfp_mtu == 0) {
	194	police->tcfp_mtu = ~0;
	195	if (R_tab)
	196	police->tcfp_mtu = 255 << R_tab->rate.cell_log;
	197	}
	198	if (R_tab) {
	199	police->rate_present = true;
3e1e3aae	200	psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0);
c6d14ff1 JP	201	qdisc_put_rtab(R_tab);
	202	} else {
	203	police->rate_present = false;
1da177e4	204	}
c6d14ff1 JP	205	if (P_tab) {
c6d14ff1 JP	206	police->peak_present = true;
3e1e3aae	207	psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0);
c6d14ff1 JP	208	qdisc_put_rtab(P_tab);
	209	} else {
	210	police->peak_present = false;
1da177e4 LT	211	}
1da177e4 LT	212
7ba699c6	213	if (tb[TCA_POLICE_RESULT])
1587bac4	214	police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
c6d14ff1 JP	215	police->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
	216	police->tcfp_toks = police->tcfp_burst;
	217	if (police->peak_present) {
	218	police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak,
	219	police->tcfp_mtu);
	220	police->tcfp_ptoks = police->tcfp_mtu_ptoks;
1da177e4	221	}
e9ce1cd3	222	police->tcf_action = parm->action;
1da177e4	223
7ba699c6	224	if (tb[TCA_POLICE_AVRATE])
1587bac4	225	police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	226
e9ce1cd3	227	spin_unlock_bh(&police->tcf_lock);
1da177e4 LT	228	if (ret != ACT_P_CREATED)
	229	return ret;
	230
d2de875c	231	police->tcfp_t_c = ktime_get_ns();
a85a970a	232	tcf_hash_insert(tn, *a);
1da177e4	233
1da177e4 LT	234	return ret;
1da177e4 LT	235
71bcb09a SH	236	failure_unlock:
71bcb09a SH	237	spin_unlock_bh(&police->tcf_lock);
1da177e4	238	failure:
3b69a4c9 YY	239	qdisc_put_rtab(P_tab);
3b69a4c9 YY	240	qdisc_put_rtab(R_tab);
1da177e4	241	if (ret == ACT_P_CREATED)
a85a970a	242	tcf_hash_cleanup(*a, est);
1da177e4 LT	243	return err;
	244	}
	245
dc7f9f6e	246	static int tcf_act_police(struct sk_buff skb, const struct tc_action a,
10297b99	247	struct tcf_result *res)
1da177e4	248	{
a85a970a	249	struct tcf_police *police = to_police(a);
c6d14ff1 JP	250	s64 now;
	251	s64 toks;
	252	s64 ptoks = 0;
1da177e4	253
e9ce1cd3	254	spin_lock(&police->tcf_lock);
1da177e4	255
bfe0d029	256	bstats_update(&police->tcf_bstats, skb);
3d3ed181	257	tcf_lastuse_update(&police->tcf_tm);
1da177e4	258
e9ce1cd3 DM	259	if (police->tcfp_ewma_rate &&
	260	police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
	261	police->tcf_qstats.overlimits++;
b9647580 JP	262	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	263	police->tcf_qstats.drops++;
e9ce1cd3 DM	264	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	265	return police->tcf_action;
1da177e4	266	}
1da177e4	267
0abf77e5	268	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
c6d14ff1	269	if (!police->rate_present) {
e9ce1cd3 DM	270	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	271	return police->tcfp_result;
1da177e4 LT	272	}
1da177e4 LT	273
d2de875c	274	now = ktime_get_ns();
c6d14ff1 JP	275	toks = min_t(s64, now - police->tcfp_t_c,
	276	police->tcfp_burst);
	277	if (police->peak_present) {
e9ce1cd3	278	ptoks = toks + police->tcfp_ptoks;
c6d14ff1 JP	279	if (ptoks > police->tcfp_mtu_ptoks)
	280	ptoks = police->tcfp_mtu_ptoks;
	281	ptoks -= (s64) psched_l2t_ns(&police->peak,
	282	qdisc_pkt_len(skb));
1da177e4	283	}
e9ce1cd3	284	toks += police->tcfp_toks;
c6d14ff1	285	if (toks > police->tcfp_burst)
e9ce1cd3	286	toks = police->tcfp_burst;
c6d14ff1	287	toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb));
1da177e4	288	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	289	police->tcfp_t_c = now;
	290	police->tcfp_toks = toks;
	291	police->tcfp_ptoks = ptoks;
	292	spin_unlock(&police->tcf_lock);
	293	return police->tcfp_result;
1da177e4 LT	294	}
	295	}
	296
e9ce1cd3	297	police->tcf_qstats.overlimits++;
b9647580 JP	298	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	299	police->tcf_qstats.drops++;
e9ce1cd3 DM	300	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	301	return police->tcf_action;
1da177e4 LT	302	}
	303
	304	static int
	305	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	306	{
27a884dc	307	unsigned char *b = skb_tail_pointer(skb);
a85a970a	308	struct tcf_police *police = to_police(a);
0f04cfd0 JM	309	struct tc_police opt = {
	310	.index = police->tcf_index,
	311	.action = police->tcf_action,
	312	.mtu = police->tcfp_mtu,
c6d14ff1	313	.burst = PSCHED_NS2TICKS(police->tcfp_burst),
0f04cfd0 JM	314	.refcnt = police->tcf_refcnt - ref,
	315	.bindcnt = police->tcf_bindcnt - bind,
	316	};
3d3ed181	317	struct tcf_t t;
0f04cfd0	318
c6d14ff1	319	if (police->rate_present)
01cb71d2	320	psched_ratecfg_getrate(&opt.rate, &police->rate);
c6d14ff1	321	if (police->peak_present)
01cb71d2	322	psched_ratecfg_getrate(&opt.peakrate, &police->peak);
1b34ec43 DM	323	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
	324	goto nla_put_failure;
	325	if (police->tcfp_result &&
	326	nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
	327	goto nla_put_failure;
	328	if (police->tcfp_ewma_rate &&
	329	nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
	330	goto nla_put_failure;
3d3ed181 JHS	331
	332	t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install);
	333	t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse);
53eb440f	334	t.firstuse = jiffies_to_clock_t(jiffies - police->tcf_tm.firstuse);
3d3ed181 JHS	335	t.expires = jiffies_to_clock_t(police->tcf_tm.expires);
	336	if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
	337	goto nla_put_failure;
	338
1da177e4 LT	339	return skb->len;
1da177e4 LT	340
7ba699c6	341	nla_put_failure:
dc5fc579	342	nlmsg_trim(skb, b);
1da177e4 LT	343	return -1;
	344	}
	345
a85a970a	346	static int tcf_police_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	347	{
	348	struct tc_action_net *tn = net_generic(net, police_net_id);
	349
	350	return tcf_hash_search(tn, a, index);
	351	}
	352
1da177e4 LT	353	MODULE_AUTHOR("Alexey Kuznetsov");
	354	MODULE_DESCRIPTION("Policing actions");
	355	MODULE_LICENSE("GPL");
	356
	357	static struct tc_action_ops act_police_ops = {
	358	.kind = "police",
	359	.type = TCA_ID_POLICE,
1da177e4 LT	360	.owner = THIS_MODULE,
	361	.act = tcf_act_police,
	362	.dump = tcf_act_police_dump,
d9fa17ef	363	.init = tcf_act_police_init,
ddf97ccd WC	364	.walk = tcf_act_police_walker,
ddf97ccd WC	365	.lookup = tcf_police_search,
a85a970a	366	.size = sizeof(struct tcf_police),
ddf97ccd WC	367	};
	368
	369	static __net_init int police_init_net(struct net *net)
	370	{
	371	struct tc_action_net *tn = net_generic(net, police_net_id);
	372
	373	return tc_action_net_init(tn, &act_police_ops, POL_TAB_MASK);
	374	}
	375
	376	static void __net_exit police_exit_net(struct net *net)
	377	{
	378	struct tc_action_net *tn = net_generic(net, police_net_id);
	379
	380	tc_action_net_exit(tn);
	381	}
	382
	383	static struct pernet_operations police_net_ops = {
	384	.init = police_init_net,
	385	.exit = police_exit_net,
	386	.id = &police_net_id,
	387	.size = sizeof(struct tc_action_net),
1da177e4 LT	388	};
	389
	390	static int __init
	391	police_init_module(void)
	392	{
ddf97ccd	393	return tcf_register_action(&act_police_ops, &police_net_ops);
1da177e4 LT	394	}
	395
	396	static void __exit
	397	police_cleanup_module(void)
	398	{
ddf97ccd	399	tcf_unregister_action(&act_police_ops, &police_net_ops);
1da177e4 LT	400	}
	401
	402	module_init(police_init_module);
	403	module_exit(police_cleanup_module);