[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 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

/* 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 int tcf_act_police_walker(struct net *net, struct sk_buff *skb,
				 struct netlink_callback *cb, int type,
				 struct tc_action *a)
{
	struct tc_action_net *tn = net_generic(net, police_net_id);
	struct tcf_hashinfo *hinfo = tn->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 tc_action_net *tn = net_generic(net, police_net_id);
	struct tcf_hashinfo *hinfo = tn->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) {
		if (tcf_hash_search(tn, a, parm->index)) {
			police = to_police(a->priv);
			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, NULL,
					    &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_get_ns();
	police->tcf_index = parm->index ? parm->index :
		tcf_hash_new_index(tn);
	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(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_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 = 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;
}

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_locate,
	.walk		=	tcf_act_police_walker,
	.lookup		=	tcf_police_search,
};

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 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
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 WC	58	static int police_net_id;
	59
	60	static int tcf_act_police_walker(struct net net, struct sk_buff skb,
	61	struct netlink_callback *cb, int type,
	62	struct tc_action *a)
1da177e4	63	{
ddf97ccd WC	64	struct tc_action_net *tn = net_generic(net, police_net_id);
ddf97ccd WC	65	struct tcf_hashinfo *hinfo = tn->hinfo;
89819dc0	66	struct hlist_head *head;
e9ce1cd3	67	struct tcf_common *p;
1da177e4	68	int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
4b3550ef	69	struct nlattr *nest;
1da177e4	70
c779f7af	71	spin_lock_bh(&hinfo->lock);
1da177e4 LT	72
	73	s_i = cb->args[0];
	74
e9ce1cd3	75	for (i = 0; i < (POL_TAB_MASK + 1); i++) {
c779f7af	76	head = &hinfo->htab[tcf_hash(i, POL_TAB_MASK)];
1da177e4	77
89819dc0	78	hlist_for_each_entry_rcu(p, head, tcfc_head) {
1da177e4 LT	79	index++;
	80	if (index < s_i)
	81	continue;
	82	a->priv = p;
	83	a->order = index;
4b3550ef PM	84	nest = nla_nest_start(skb, a->order);
	85	if (nest == NULL)
	86	goto nla_put_failure;
1da177e4 LT	87	if (type == RTM_DELACTION)
	88	err = tcf_action_dump_1(skb, a, 0, 1);
	89	else
	90	err = tcf_action_dump_1(skb, a, 0, 0);
	91	if (err < 0) {
	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
c1b52739 BL	118	static int tcf_act_police_locate(struct net net, struct nlattr nla,
	119	struct nlattr est, struct tc_action a,
	120	int ovr, int bind)
1da177e4	121	{
cc7ec456	122	unsigned int h;
1da177e4	123	int ret = 0, err;
7ba699c6	124	struct nlattr *tb[TCA_POLICE_MAX + 1];
1da177e4	125	struct tc_police *parm;
e9ce1cd3	126	struct tcf_police *police;
1da177e4	127	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
ddf97ccd WC	128	struct tc_action_net *tn = net_generic(net, police_net_id);
ddf97ccd WC	129	struct tcf_hashinfo *hinfo = tn->hinfo;
1e9b3d53	130	int size;
1da177e4	131
cee63723	132	if (nla == NULL)
1da177e4 LT	133	return -EINVAL;
1da177e4 LT	134
53b2bf3f	135	err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
cee63723 PM	136	if (err < 0)
	137	return err;
	138
7ba699c6	139	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	140	return -EINVAL;
7ba699c6	141	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	142	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	143	return -EINVAL;
7ba699c6	144	parm = nla_data(tb[TCA_POLICE_TBF]);
1da177e4	145
e9ce1cd3	146	if (parm->index) {
ddf97ccd	147	if (tcf_hash_search(tn, a, parm->index)) {
6e6a50c2	148	police = to_police(a->priv);
e9ce1cd3 DM	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	185	if (est) {
22e0f8b9	186	err = gen_replace_estimator(&police->tcf_bstats, NULL,
71bcb09a SH	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
d2de875c	239	police->tcfp_t_c = ktime_get_ns();
e9ce1cd3	240	police->tcf_index = parm->index ? parm->index :
ddf97ccd	241	tcf_hash_new_index(tn);
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
dc7f9f6e	260	static int tcf_act_police(struct sk_buff skb, const struct tc_action a,
10297b99	261	struct tcf_result *res)
1da177e4	262	{
e9ce1cd3	263	struct tcf_police *police = a->priv;
c6d14ff1 JP	264	s64 now;
	265	s64 toks;
	266	s64 ptoks = 0;
1da177e4	267
e9ce1cd3	268	spin_lock(&police->tcf_lock);
1da177e4	269
bfe0d029	270	bstats_update(&police->tcf_bstats, skb);
1da177e4	271
e9ce1cd3 DM	272	if (police->tcfp_ewma_rate &&
	273	police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
	274	police->tcf_qstats.overlimits++;
b9647580 JP	275	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	276	police->tcf_qstats.drops++;
e9ce1cd3 DM	277	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	278	return police->tcf_action;
1da177e4	279	}
1da177e4	280
0abf77e5	281	if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
c6d14ff1	282	if (!police->rate_present) {
e9ce1cd3 DM	283	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	284	return police->tcfp_result;
1da177e4 LT	285	}
1da177e4 LT	286
d2de875c	287	now = ktime_get_ns();
c6d14ff1 JP	288	toks = min_t(s64, now - police->tcfp_t_c,
	289	police->tcfp_burst);
	290	if (police->peak_present) {
e9ce1cd3	291	ptoks = toks + police->tcfp_ptoks;
c6d14ff1 JP	292	if (ptoks > police->tcfp_mtu_ptoks)
	293	ptoks = police->tcfp_mtu_ptoks;
	294	ptoks -= (s64) psched_l2t_ns(&police->peak,
	295	qdisc_pkt_len(skb));
1da177e4	296	}
e9ce1cd3	297	toks += police->tcfp_toks;
c6d14ff1	298	if (toks > police->tcfp_burst)
e9ce1cd3	299	toks = police->tcfp_burst;
c6d14ff1	300	toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb));
1da177e4	301	if ((toks\|ptoks) >= 0) {
e9ce1cd3 DM	302	police->tcfp_t_c = now;
	303	police->tcfp_toks = toks;
	304	police->tcfp_ptoks = ptoks;
	305	spin_unlock(&police->tcf_lock);
	306	return police->tcfp_result;
1da177e4 LT	307	}
	308	}
	309
e9ce1cd3	310	police->tcf_qstats.overlimits++;
b9647580 JP	311	if (police->tcf_action == TC_ACT_SHOT)
b9647580 JP	312	police->tcf_qstats.drops++;
e9ce1cd3 DM	313	spin_unlock(&police->tcf_lock);
e9ce1cd3 DM	314	return police->tcf_action;
1da177e4 LT	315	}
	316
	317	static int
	318	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	319	{
27a884dc	320	unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3	321	struct tcf_police *police = a->priv;
0f04cfd0 JM	322	struct tc_police opt = {
	323	.index = police->tcf_index,
	324	.action = police->tcf_action,
	325	.mtu = police->tcfp_mtu,
c6d14ff1	326	.burst = PSCHED_NS2TICKS(police->tcfp_burst),
0f04cfd0 JM	327	.refcnt = police->tcf_refcnt - ref,
	328	.bindcnt = police->tcf_bindcnt - bind,
	329	};
	330
c6d14ff1	331	if (police->rate_present)
01cb71d2	332	psched_ratecfg_getrate(&opt.rate, &police->rate);
c6d14ff1	333	if (police->peak_present)
01cb71d2	334	psched_ratecfg_getrate(&opt.peakrate, &police->peak);
1b34ec43 DM	335	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
	336	goto nla_put_failure;
	337	if (police->tcfp_result &&
	338	nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
	339	goto nla_put_failure;
	340	if (police->tcfp_ewma_rate &&
	341	nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
	342	goto nla_put_failure;
1da177e4 LT	343	return skb->len;
1da177e4 LT	344
7ba699c6	345	nla_put_failure:
dc5fc579	346	nlmsg_trim(skb, b);
1da177e4 LT	347	return -1;
	348	}
	349
ddf97ccd WC	350	static int tcf_police_search(struct net net, struct tc_action a, u32 index)
	351	{
	352	struct tc_action_net *tn = net_generic(net, police_net_id);
	353
	354	return tcf_hash_search(tn, a, index);
	355	}
	356
1da177e4 LT	357	MODULE_AUTHOR("Alexey Kuznetsov");
	358	MODULE_DESCRIPTION("Policing actions");
	359	MODULE_LICENSE("GPL");
	360
	361	static struct tc_action_ops act_police_ops = {
	362	.kind = "police",
	363	.type = TCA_ID_POLICE,
1da177e4 LT	364	.owner = THIS_MODULE,
	365	.act = tcf_act_police,
	366	.dump = tcf_act_police_dump,
1da177e4	367	.init = tcf_act_police_locate,
ddf97ccd WC	368	.walk = tcf_act_police_walker,
	369	.lookup = tcf_police_search,
	370	};
	371
	372	static __net_init int police_init_net(struct net *net)
	373	{
	374	struct tc_action_net *tn = net_generic(net, police_net_id);
	375
	376	return tc_action_net_init(tn, &act_police_ops, POL_TAB_MASK);
	377	}
	378
	379	static void __net_exit police_exit_net(struct net *net)
	380	{
	381	struct tc_action_net *tn = net_generic(net, police_net_id);
	382
	383	tc_action_net_exit(tn);
	384	}
	385
	386	static struct pernet_operations police_net_ops = {
	387	.init = police_init_net,
	388	.exit = police_exit_net,
	389	.id = &police_net_id,
	390	.size = sizeof(struct tc_action_net),
1da177e4 LT	391	};
	392
	393	static int __init
	394	police_init_module(void)
	395	{
ddf97ccd	396	return tcf_register_action(&act_police_ops, &police_net_ops);
1da177e4 LT	397	}
	398
	399	static void __exit
	400	police_cleanup_module(void)
	401	{
ddf97ccd	402	tcf_unregister_action(&act_police_ops, &police_net_ops);
1da177e4 LT	403	}
	404
	405	module_init(police_init_module);
	406	module_exit(police_cleanup_module);