[linux.git] / net / sched / act_police.c

/*
 * net/sched/police.c	Input police filter.
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 * Authors:	Alexey Kuznetsov, <[email protected]>
 * 		J Hadi Salim (action changes)
 */

#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/bitops.h>
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/module.h>
#include <linux/rtnetlink.h>
#include <linux/init.h>
#include <net/sock.h>
#include <net/act_api.h>

#define L2T(p,L)   ((p)->R_tab->data[(L)>>(p)->R_tab->rate.cell_log])
#define L2T_P(p,L) ((p)->P_tab->data[(L)>>(p)->P_tab->rate.cell_log])
#define PRIV(a) ((struct tcf_police *) (a)->priv)

/* use generic hash table */
#define MY_TAB_SIZE     16
#define MY_TAB_MASK     15
static u32 idx_gen;
static struct tcf_police *tcf_police_ht[MY_TAB_SIZE];
/* Policer hash table lock */
static DEFINE_RWLOCK(police_lock);

/* Each policer is serialized by its individual spinlock */

static __inline__ unsigned tcf_police_hash(u32 index)
{
	return index&0xF;
}

static __inline__ struct tcf_police * tcf_police_lookup(u32 index)
{
	struct tcf_police *p;

	read_lock(&police_lock);
	for (p = tcf_police_ht[tcf_police_hash(index)]; p; p = p->next) {
		if (p->index == index)
			break;
	}
	read_unlock(&police_lock);
	return p;
}

#ifdef CONFIG_NET_CLS_ACT
static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *cb,
                              int type, struct tc_action *a)
{
	struct tcf_police *p;
	int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
	struct rtattr *r;

	read_lock(&police_lock);

	s_i = cb->args[0];

	for (i = 0; i < MY_TAB_SIZE; i++) {
		p = tcf_police_ht[tcf_police_hash(i)];

		for (; p; p = p->next) {
			index++;
			if (index < s_i)
				continue;
			a->priv = p;
			a->order = index;
			r = (struct rtattr*) skb->tail;
			RTA_PUT(skb, a->order, 0, NULL);
			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--;
				skb_trim(skb, (u8*)r - skb->data);
				goto done;
			}
			r->rta_len = skb->tail - (u8*)r;
			n_i++;
		}
	}
done:
	read_unlock(&police_lock);
	if (n_i)
		cb->args[0] += n_i;
	return n_i;

rtattr_failure:
	skb_trim(skb, (u8*)r - skb->data);
	goto done;
}

static inline int
tcf_act_police_hash_search(struct tc_action *a, u32 index)
{
	struct tcf_police *p = tcf_police_lookup(index);

	if (p != NULL) {
		a->priv = p;
		return 1;
	} else {
		return 0;
	}
}
#endif

static inline u32 tcf_police_new_index(void)
{
	do {
		if (++idx_gen == 0)
			idx_gen = 1;
	} while (tcf_police_lookup(idx_gen));

	return idx_gen;
}

void tcf_police_destroy(struct tcf_police *p)
{
	unsigned h = tcf_police_hash(p->index);
	struct tcf_police **p1p;
	
	for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->next) {
		if (*p1p == p) {
			write_lock_bh(&police_lock);
			*p1p = p->next;
			write_unlock_bh(&police_lock);
#ifdef CONFIG_NET_ESTIMATOR
			gen_kill_estimator(&p->bstats, &p->rate_est);
#endif
			if (p->R_tab)
				qdisc_put_rtab(p->R_tab);
			if (p->P_tab)
				qdisc_put_rtab(p->P_tab);
			kfree(p);
			return;
		}
	}
	BUG_TRAP(0);
}

#ifdef CONFIG_NET_CLS_ACT
static int tcf_act_police_locate(struct rtattr *rta, struct rtattr *est,
                                 struct tc_action *a, int ovr, int bind)
{
	unsigned h;
	int ret = 0, err;
	struct rtattr *tb[TCA_POLICE_MAX];
	struct tc_police *parm;
	struct tcf_police *p;
	struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;

	if (rta == NULL || rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
		return -EINVAL;

	if (tb[TCA_POLICE_TBF-1] == NULL ||
	    RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]) != sizeof(*parm))
		return -EINVAL;
	parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);

	if (tb[TCA_POLICE_RESULT-1] != NULL &&
	    RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
		return -EINVAL;
	if (tb[TCA_POLICE_RESULT-1] != NULL &&
	    RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
		return -EINVAL;

	if (parm->index && (p = tcf_police_lookup(parm->index)) != NULL) {
		a->priv = p;
		if (bind) {
			p->bindcnt += 1;
			p->refcnt += 1;
		}
		if (ovr)
			goto override;
		return ret;
	}

	p = kmalloc(sizeof(*p), GFP_KERNEL);
	if (p == NULL)
		return -ENOMEM;
	memset(p, 0, sizeof(*p));

	ret = ACT_P_CREATED;
	p->refcnt = 1;
	spin_lock_init(&p->lock);
	p->stats_lock = &p->lock;
	if (bind)
		p->bindcnt = 1;
override:
	if (parm->rate.rate) {
		err = -ENOMEM;
		R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
		if (R_tab == NULL)
			goto failure;
		if (parm->peakrate.rate) {
			P_tab = qdisc_get_rtab(&parm->peakrate,
					       tb[TCA_POLICE_PEAKRATE-1]);
			if (p->P_tab == NULL) {
				qdisc_put_rtab(R_tab);
				goto failure;
			}
		}
	}
	/* No failure allowed after this point */
	spin_lock_bh(&p->lock);
	if (R_tab != NULL) {
		qdisc_put_rtab(p->R_tab);
		p->R_tab = R_tab;
	}
	if (P_tab != NULL) {
		qdisc_put_rtab(p->P_tab);
		p->P_tab = P_tab;
	}

	if (tb[TCA_POLICE_RESULT-1])
		p->result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
	p->toks = p->burst = parm->burst;
	p->mtu = parm->mtu;
	if (p->mtu == 0) {
		p->mtu = ~0;
		if (p->R_tab)
			p->mtu = 255<<p->R_tab->rate.cell_log;
	}
	if (p->P_tab)
		p->ptoks = L2T_P(p, p->mtu);
	p->action = parm->action;

#ifdef CONFIG_NET_ESTIMATOR
	if (tb[TCA_POLICE_AVRATE-1])
		p->ewma_rate = *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
	if (est)
		gen_replace_estimator(&p->bstats, &p->rate_est, p->stats_lock, est);
#endif

	spin_unlock_bh(&p->lock);
	if (ret != ACT_P_CREATED)
		return ret;

	PSCHED_GET_TIME(p->t_c);
	p->index = parm->index ? : tcf_police_new_index();
	h = tcf_police_hash(p->index);
	write_lock_bh(&police_lock);
	p->next = tcf_police_ht[h];
	tcf_police_ht[h] = p;
	write_unlock_bh(&police_lock);

	a->priv = p;
	return ret;

failure:
	if (ret == ACT_P_CREATED)
		kfree(p);
	return err;
}

static int tcf_act_police_cleanup(struct tc_action *a, int bind)
{
	struct tcf_police *p = PRIV(a);

	if (p != NULL)
		return tcf_police_release(p, bind);
	return 0;
}

static int tcf_act_police(struct sk_buff *skb, struct tc_action *a,
                          struct tcf_result *res)
{
	psched_time_t now;
	struct tcf_police *p = PRIV(a);
	long toks;
	long ptoks = 0;

	spin_lock(&p->lock);

	p->bstats.bytes += skb->len;
	p->bstats.packets++;

#ifdef CONFIG_NET_ESTIMATOR
	if (p->ewma_rate && p->rate_est.bps >= p->ewma_rate) {
		p->qstats.overlimits++;
		spin_unlock(&p->lock);
		return p->action;
	}
#endif

	if (skb->len <= p->mtu) {
		if (p->R_tab == NULL) {
			spin_unlock(&p->lock);
			return p->result;
		}

		PSCHED_GET_TIME(now);

		toks = PSCHED_TDIFF_SAFE(now, p->t_c, p->burst);

		if (p->P_tab) {
			ptoks = toks + p->ptoks;
			if (ptoks > (long)L2T_P(p, p->mtu))
				ptoks = (long)L2T_P(p, p->mtu);
			ptoks -= L2T_P(p, skb->len);
		}
		toks += p->toks;
		if (toks > (long)p->burst)
			toks = p->burst;
		toks -= L2T(p, skb->len);

		if ((toks|ptoks) >= 0) {
			p->t_c = now;
			p->toks = toks;
			p->ptoks = ptoks;
			spin_unlock(&p->lock);
			return p->result;
		}
	}

	p->qstats.overlimits++;
	spin_unlock(&p->lock);
	return p->action;
}

static int
tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
{
	unsigned char	 *b = skb->tail;
	struct tc_police opt;
	struct tcf_police *p = PRIV(a);

	opt.index = p->index;
	opt.action = p->action;
	opt.mtu = p->mtu;
	opt.burst = p->burst;
	opt.refcnt = p->refcnt - ref;
	opt.bindcnt = p->bindcnt - bind;
	if (p->R_tab)
		opt.rate = p->R_tab->rate;
	else
		memset(&opt.rate, 0, sizeof(opt.rate));
	if (p->P_tab)
		opt.peakrate = p->P_tab->rate;
	else
		memset(&opt.peakrate, 0, sizeof(opt.peakrate));
	RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
	if (p->result)
		RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int), &p->result);
#ifdef CONFIG_NET_ESTIMATOR
	if (p->ewma_rate)
		RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &p->ewma_rate);
#endif
	return skb->len;

rtattr_failure:
	skb_trim(skb, b - skb->data);
	return -1;
}

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,
	.capab		=	TCA_CAP_NONE,
	.owner		=	THIS_MODULE,
	.act		=	tcf_act_police,
	.dump		=	tcf_act_police_dump,
	.cleanup	=	tcf_act_police_cleanup,
	.lookup		=	tcf_act_police_hash_search,
	.init		=	tcf_act_police_locate,
	.walk		=	tcf_act_police_walker
};

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

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

module_init(police_init_module);
module_exit(police_cleanup_module);

#else /* CONFIG_NET_CLS_ACT */

struct tcf_police * tcf_police_locate(struct rtattr *rta, struct rtattr *est)
{
	unsigned h;
	struct tcf_police *p;
	struct rtattr *tb[TCA_POLICE_MAX];
	struct tc_police *parm;

	if (rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
		return NULL;

	if (tb[TCA_POLICE_TBF-1] == NULL ||
	    RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]) != sizeof(*parm))
		return NULL;

	parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);

	if (parm->index && (p = tcf_police_lookup(parm->index)) != NULL) {
		p->refcnt++;
		return p;
	}

	p = kmalloc(sizeof(*p), GFP_KERNEL);
	if (p == NULL)
		return NULL;

	memset(p, 0, sizeof(*p));
	p->refcnt = 1;
	spin_lock_init(&p->lock);
	p->stats_lock = &p->lock;
	if (parm->rate.rate) {
		p->R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
		if (p->R_tab == NULL)
			goto failure;
		if (parm->peakrate.rate) {
			p->P_tab = qdisc_get_rtab(&parm->peakrate,
			                          tb[TCA_POLICE_PEAKRATE-1]);
			if (p->P_tab == NULL)
				goto failure;
		}
	}
	if (tb[TCA_POLICE_RESULT-1]) {
		if (RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
			goto failure;
		p->result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
	}
#ifdef CONFIG_NET_ESTIMATOR
	if (tb[TCA_POLICE_AVRATE-1]) {
		if (RTA_PAYLOAD(tb[TCA_POLICE_AVRATE-1]) != sizeof(u32))
			goto failure;
		p->ewma_rate = *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
	}
#endif
	p->toks = p->burst = parm->burst;
	p->mtu = parm->mtu;
	if (p->mtu == 0) {
		p->mtu = ~0;
		if (p->R_tab)
			p->mtu = 255<<p->R_tab->rate.cell_log;
	}
	if (p->P_tab)
		p->ptoks = L2T_P(p, p->mtu);
	PSCHED_GET_TIME(p->t_c);
	p->index = parm->index ? : tcf_police_new_index();
	p->action = parm->action;
#ifdef CONFIG_NET_ESTIMATOR
	if (est)
		gen_new_estimator(&p->bstats, &p->rate_est, p->stats_lock, est);
#endif
	h = tcf_police_hash(p->index);
	write_lock_bh(&police_lock);
	p->next = tcf_police_ht[h];
	tcf_police_ht[h] = p;
	write_unlock_bh(&police_lock);
	return p;

failure:
	if (p->R_tab)
		qdisc_put_rtab(p->R_tab);
	kfree(p);
	return NULL;
}

int tcf_police(struct sk_buff *skb, struct tcf_police *p)
{
	psched_time_t now;
	long toks;
	long ptoks = 0;

	spin_lock(&p->lock);

	p->bstats.bytes += skb->len;
	p->bstats.packets++;

#ifdef CONFIG_NET_ESTIMATOR
	if (p->ewma_rate && p->rate_est.bps >= p->ewma_rate) {
		p->qstats.overlimits++;
		spin_unlock(&p->lock);
		return p->action;
	}
#endif

	if (skb->len <= p->mtu) {
		if (p->R_tab == NULL) {
			spin_unlock(&p->lock);
			return p->result;
		}

		PSCHED_GET_TIME(now);

		toks = PSCHED_TDIFF_SAFE(now, p->t_c, p->burst);

		if (p->P_tab) {
			ptoks = toks + p->ptoks;
			if (ptoks > (long)L2T_P(p, p->mtu))
				ptoks = (long)L2T_P(p, p->mtu);
			ptoks -= L2T_P(p, skb->len);
		}
		toks += p->toks;
		if (toks > (long)p->burst)
			toks = p->burst;
		toks -= L2T(p, skb->len);

		if ((toks|ptoks) >= 0) {
			p->t_c = now;
			p->toks = toks;
			p->ptoks = ptoks;
			spin_unlock(&p->lock);
			return p->result;
		}
	}

	p->qstats.overlimits++;
	spin_unlock(&p->lock);
	return p->action;
}
EXPORT_SYMBOL(tcf_police);

int tcf_police_dump(struct sk_buff *skb, struct tcf_police *p)
{
	unsigned char	 *b = skb->tail;
	struct tc_police opt;

	opt.index = p->index;
	opt.action = p->action;
	opt.mtu = p->mtu;
	opt.burst = p->burst;
	if (p->R_tab)
		opt.rate = p->R_tab->rate;
	else
		memset(&opt.rate, 0, sizeof(opt.rate));
	if (p->P_tab)
		opt.peakrate = p->P_tab->rate;
	else
		memset(&opt.peakrate, 0, sizeof(opt.peakrate));
	RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
	if (p->result)
		RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int), &p->result);
#ifdef CONFIG_NET_ESTIMATOR
	if (p->ewma_rate)
		RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &p->ewma_rate);
#endif
	return skb->len;

rtattr_failure:
	skb_trim(skb, b - skb->data);
	return -1;
}

int tcf_police_dump_stats(struct sk_buff *skb, struct tcf_police *p)
{
	struct gnet_dump d;
	
	if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
			TCA_XSTATS, p->stats_lock, &d) < 0)
		goto errout;
	
	if (gnet_stats_copy_basic(&d, &p->bstats) < 0 ||
#ifdef CONFIG_NET_ESTIMATOR
	    gnet_stats_copy_rate_est(&d, &p->rate_est) < 0 ||
#endif
	    gnet_stats_copy_queue(&d, &p->qstats) < 0)
		goto errout;

	if (gnet_stats_finish_copy(&d) < 0)
		goto errout;

	return 0;

errout:
	return -1;
}

#endif /* CONFIG_NET_CLS_ACT */
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, <[email protected]>
	10	* J Hadi Salim (action changes)
	11	*/
	12
	13	#include <asm/uaccess.h>
	14	#include <asm/system.h>
	15	#include <linux/bitops.h>
	16	#include <linux/config.h>
	17	#include <linux/module.h>
	18	#include <linux/types.h>
	19	#include <linux/kernel.h>
	20	#include <linux/sched.h>
	21	#include <linux/string.h>
	22	#include <linux/mm.h>
	23	#include <linux/socket.h>
	24	#include <linux/sockios.h>
	25	#include <linux/in.h>
	26	#include <linux/errno.h>
	27	#include <linux/interrupt.h>
	28	#include <linux/netdevice.h>
	29	#include <linux/skbuff.h>
	30	#include <linux/module.h>
	31	#include <linux/rtnetlink.h>
	32	#include <linux/init.h>
	33	#include <net/sock.h>
	34	#include <net/act_api.h>
	35
	36	#define L2T(p,L) ((p)->R_tab->data[(L)>>(p)->R_tab->rate.cell_log])
	37	#define L2T_P(p,L) ((p)->P_tab->data[(L)>>(p)->P_tab->rate.cell_log])
	38	#define PRIV(a) ((struct tcf_police *) (a)->priv)
	39
	40	/* use generic hash table */
	41	#define MY_TAB_SIZE 16
	42	#define MY_TAB_MASK 15
	43	static u32 idx_gen;
	44	static struct tcf_police *tcf_police_ht[MY_TAB_SIZE];
	45	/* Policer hash table lock */
	46	static DEFINE_RWLOCK(police_lock);
	47
	48	/* Each policer is serialized by its individual spinlock */
	49
	50	static __inline__ unsigned tcf_police_hash(u32 index)
	51	{
	52	return index&0xF;
	53	}
	54
	55	static __inline__ struct tcf_police * tcf_police_lookup(u32 index)
	56	{
	57	struct tcf_police *p;
	58
	59	read_lock(&police_lock);
	60	for (p = tcf_police_ht[tcf_police_hash(index)]; p; p = p->next) {
	61	if (p->index == index)
	62	break;
	63	}
	64	read_unlock(&police_lock);
65	return p;
66	}
67
68	#ifdef CONFIG_NET_CLS_ACT
83b950c8	69	static int tcf_act_police_walker(struct sk_buff skb, struct netlink_callback cb,
1da177e4 LT	70	int type, struct tc_action *a)
	71	{
	72	struct tcf_police *p;
	73	int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
	74	struct rtattr *r;
	75
	76	read_lock(&police_lock);
	77
	78	s_i = cb->args[0];
	79
	80	for (i = 0; i < MY_TAB_SIZE; i++) {
	81	p = tcf_police_ht[tcf_police_hash(i)];
	82
	83	for (; p; p = p->next) {
	84	index++;
	85	if (index < s_i)
	86	continue;
	87	a->priv = p;
	88	a->order = index;
	89	r = (struct rtattr*) skb->tail;
	90	RTA_PUT(skb, a->order, 0, NULL);
	91	if (type == RTM_DELACTION)
	92	err = tcf_action_dump_1(skb, a, 0, 1);
	93	else
	94	err = tcf_action_dump_1(skb, a, 0, 0);
	95	if (err < 0) {
	96	index--;
	97	skb_trim(skb, (u8*)r - skb->data);
	98	goto done;
	99	}
	100	r->rta_len = skb->tail - (u8*)r;
	101	n_i++;
	102	}
	103	}
	104	done:
	105	read_unlock(&police_lock);
	106	if (n_i)
	107	cb->args[0] += n_i;
	108	return n_i;
	109
	110	rtattr_failure:
	111	skb_trim(skb, (u8*)r - skb->data);
	112	goto done;
	113	}
	114
	115	static inline int
83b950c8	116	tcf_act_police_hash_search(struct tc_action *a, u32 index)
1da177e4 LT	117	{
	118	struct tcf_police *p = tcf_police_lookup(index);
	119
	120	if (p != NULL) {
	121	a->priv = p;
	122	return 1;
	123	} else {
	124	return 0;
	125	}
	126	}
	127	#endif
	128
	129	static inline u32 tcf_police_new_index(void)
	130	{
	131	do {
	132	if (++idx_gen == 0)
	133	idx_gen = 1;
	134	} while (tcf_police_lookup(idx_gen));
	135
	136	return idx_gen;
	137	}
	138
	139	void tcf_police_destroy(struct tcf_police *p)
	140	{
	141	unsigned h = tcf_police_hash(p->index);
	142	struct tcf_police **p1p;
	143
	144	for (p1p = &tcf_police_ht[h]; p1p; p1p = &(p1p)->next) {
	145	if (*p1p == p) {
	146	write_lock_bh(&police_lock);
	147	*p1p = p->next;
	148	write_unlock_bh(&police_lock);
	149	#ifdef CONFIG_NET_ESTIMATOR
	150	gen_kill_estimator(&p->bstats, &p->rate_est);
	151	#endif
	152	if (p->R_tab)
	153	qdisc_put_rtab(p->R_tab);
	154	if (p->P_tab)
	155	qdisc_put_rtab(p->P_tab);
	156	kfree(p);
	157	return;
	158	}
	159	}
	160	BUG_TRAP(0);
	161	}
	162
	163	#ifdef CONFIG_NET_CLS_ACT
	164	static int tcf_act_police_locate(struct rtattr rta, struct rtattr est,
	165	struct tc_action *a, int ovr, int bind)
	166	{
	167	unsigned h;
	168	int ret = 0, err;
	169	struct rtattr *tb[TCA_POLICE_MAX];
	170	struct tc_police *parm;
	171	struct tcf_police *p;
	172	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
	173
	174	if (rta == NULL \|\| rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
	175	return -EINVAL;
	176
	177	if (tb[TCA_POLICE_TBF-1] == NULL \|\|
	178	RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]) != sizeof(*parm))
	179	return -EINVAL;
	180	parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
181
182	if (tb[TCA_POLICE_RESULT-1] != NULL &&
183	RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
184	return -EINVAL;
185	if (tb[TCA_POLICE_RESULT-1] != NULL &&
186	RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
187	return -EINVAL;
188
189	if (parm->index && (p = tcf_police_lookup(parm->index)) != NULL) {
190	a->priv = p;
191	if (bind) {
192	p->bindcnt += 1;
193	p->refcnt += 1;
194	}
195	if (ovr)
196	goto override;
197	return ret;
198	}
199
200	p = kmalloc(sizeof(*p), GFP_KERNEL);
201	if (p == NULL)
202	return -ENOMEM;
203	memset(p, 0, sizeof(*p));
204
205	ret = ACT_P_CREATED;
206	p->refcnt = 1;
207	spin_lock_init(&p->lock);
208	p->stats_lock = &p->lock;
209	if (bind)
210	p->bindcnt = 1;
211	override:
212	if (parm->rate.rate) {
213	err = -ENOMEM;
214	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
215	if (R_tab == NULL)
216	goto failure;
217	if (parm->peakrate.rate) {
218	P_tab = qdisc_get_rtab(&parm->peakrate,
219	tb[TCA_POLICE_PEAKRATE-1]);
220	if (p->P_tab == NULL) {
221	qdisc_put_rtab(R_tab);
222	goto failure;
223	}
224	}
225	}
226	/* No failure allowed after this point */
227	spin_lock_bh(&p->lock);
228	if (R_tab != NULL) {
229	qdisc_put_rtab(p->R_tab);
230	p->R_tab = R_tab;
231	}
232	if (P_tab != NULL) {
233	qdisc_put_rtab(p->P_tab);
234	p->P_tab = P_tab;
235	}
236
237	if (tb[TCA_POLICE_RESULT-1])
238	p->result = (u32)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
239	p->toks = p->burst = parm->burst;
240	p->mtu = parm->mtu;
241	if (p->mtu == 0) {
242	p->mtu = ~0;
243	if (p->R_tab)
244	p->mtu = 255<<p->R_tab->rate.cell_log;
245	}
246	if (p->P_tab)
247	p->ptoks = L2T_P(p, p->mtu);
248	p->action = parm->action;
249
250	#ifdef CONFIG_NET_ESTIMATOR
251	if (tb[TCA_POLICE_AVRATE-1])
252	p->ewma_rate = (u32)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
253	if (est)
254	gen_replace_estimator(&p->bstats, &p->rate_est, p->stats_lock, est);
255	#endif
256
257	spin_unlock_bh(&p->lock);
258	if (ret != ACT_P_CREATED)
259	return ret;
260
261	PSCHED_GET_TIME(p->t_c);
262	p->index = parm->index ? : tcf_police_new_index();
263	h = tcf_police_hash(p->index);
264	write_lock_bh(&police_lock);
265	p->next = tcf_police_ht[h];
266	tcf_police_ht[h] = p;
267	write_unlock_bh(&police_lock);
268
269	a->priv = p;
270	return ret;
271
272	failure:
273	if (ret == ACT_P_CREATED)
274	kfree(p);
275	return err;
276	}
277
278	static int tcf_act_police_cleanup(struct tc_action *a, int bind)
279	{
280	struct tcf_police *p = PRIV(a);
281
282	if (p != NULL)
283	return tcf_police_release(p, bind);
284	return 0;
285	}
286
f43c5a0d	287	static int tcf_act_police(struct sk_buff skb, struct tc_action a,
abc3bc58	288	struct tcf_result *res)
1da177e4 LT	289	{
1da177e4 LT	290	psched_time_t now;
1da177e4 LT	291	struct tcf_police *p = PRIV(a);
	292	long toks;
	293	long ptoks = 0;
	294
	295	spin_lock(&p->lock);
	296
	297	p->bstats.bytes += skb->len;
	298	p->bstats.packets++;
	299
	300	#ifdef CONFIG_NET_ESTIMATOR
	301	if (p->ewma_rate && p->rate_est.bps >= p->ewma_rate) {
	302	p->qstats.overlimits++;
	303	spin_unlock(&p->lock);
	304	return p->action;
	305	}
	306	#endif
	307
	308	if (skb->len <= p->mtu) {
	309	if (p->R_tab == NULL) {
	310	spin_unlock(&p->lock);
	311	return p->result;
	312	}
	313
	314	PSCHED_GET_TIME(now);
	315
	316	toks = PSCHED_TDIFF_SAFE(now, p->t_c, p->burst);
	317
	318	if (p->P_tab) {
	319	ptoks = toks + p->ptoks;
	320	if (ptoks > (long)L2T_P(p, p->mtu))
	321	ptoks = (long)L2T_P(p, p->mtu);
	322	ptoks -= L2T_P(p, skb->len);
	323	}
	324	toks += p->toks;
	325	if (toks > (long)p->burst)
	326	toks = p->burst;
	327	toks -= L2T(p, skb->len);
	328
	329	if ((toks\|ptoks) >= 0) {
	330	p->t_c = now;
	331	p->toks = toks;
	332	p->ptoks = ptoks;
	333	spin_unlock(&p->lock);
	334	return p->result;
	335	}
	336	}
	337
	338	p->qstats.overlimits++;
	339	spin_unlock(&p->lock);
	340	return p->action;
	341	}
	342
	343	static int
	344	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	345	{
	346	unsigned char *b = skb->tail;
	347	struct tc_police opt;
	348	struct tcf_police *p = PRIV(a);
	349
	350	opt.index = p->index;
	351	opt.action = p->action;
	352	opt.mtu = p->mtu;
	353	opt.burst = p->burst;
	354	opt.refcnt = p->refcnt - ref;
355	opt.bindcnt = p->bindcnt - bind;
356	if (p->R_tab)
357	opt.rate = p->R_tab->rate;
358	else
359	memset(&opt.rate, 0, sizeof(opt.rate));
360	if (p->P_tab)
361	opt.peakrate = p->P_tab->rate;
362	else
363	memset(&opt.peakrate, 0, sizeof(opt.peakrate));
364	RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
365	if (p->result)
366	RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int), &p->result);
367	#ifdef CONFIG_NET_ESTIMATOR
368	if (p->ewma_rate)
369	RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &p->ewma_rate);
370	#endif
371	return skb->len;
372
373	rtattr_failure:
374	skb_trim(skb, b - skb->data);
375	return -1;
376	}
377
378	MODULE_AUTHOR("Alexey Kuznetsov");
379	MODULE_DESCRIPTION("Policing actions");
380	MODULE_LICENSE("GPL");
381
382	static struct tc_action_ops act_police_ops = {
383	.kind = "police",
384	.type = TCA_ID_POLICE,
385	.capab = TCA_CAP_NONE,
386	.owner = THIS_MODULE,
387	.act = tcf_act_police,
388	.dump = tcf_act_police_dump,
389	.cleanup = tcf_act_police_cleanup,
83b950c8	390	.lookup = tcf_act_police_hash_search,
1da177e4	391	.init = tcf_act_police_locate,
83b950c8	392	.walk = tcf_act_police_walker
1da177e4 LT	393	};
	394
	395	static int __init
	396	police_init_module(void)
	397	{
	398	return tcf_register_action(&act_police_ops);
	399	}
	400
	401	static void __exit
	402	police_cleanup_module(void)
	403	{
	404	tcf_unregister_action(&act_police_ops);
	405	}
	406
	407	module_init(police_init_module);
	408	module_exit(police_cleanup_module);
	409
31bd06eb	410	#else /* CONFIG_NET_CLS_ACT */
1da177e4 LT	411
	412	struct tcf_police * tcf_police_locate(struct rtattr rta, struct rtattr est)
	413	{
	414	unsigned h;
	415	struct tcf_police *p;
	416	struct rtattr *tb[TCA_POLICE_MAX];
	417	struct tc_police *parm;
	418
	419	if (rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
	420	return NULL;
	421
	422	if (tb[TCA_POLICE_TBF-1] == NULL \|\|
	423	RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]) != sizeof(*parm))
	424	return NULL;
	425
	426	parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
	427
	428	if (parm->index && (p = tcf_police_lookup(parm->index)) != NULL) {
	429	p->refcnt++;
	430	return p;
	431	}
	432
	433	p = kmalloc(sizeof(*p), GFP_KERNEL);
	434	if (p == NULL)
	435	return NULL;
	436
	437	memset(p, 0, sizeof(*p));
	438	p->refcnt = 1;
	439	spin_lock_init(&p->lock);
	440	p->stats_lock = &p->lock;
	441	if (parm->rate.rate) {
	442	p->R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
	443	if (p->R_tab == NULL)
	444	goto failure;
	445	if (parm->peakrate.rate) {
	446	p->P_tab = qdisc_get_rtab(&parm->peakrate,
	447	tb[TCA_POLICE_PEAKRATE-1]);
	448	if (p->P_tab == NULL)
	449	goto failure;
	450	}
	451	}
	452	if (tb[TCA_POLICE_RESULT-1]) {
	453	if (RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
	454	goto failure;
	455	p->result = (u32)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
	456	}
	457	#ifdef CONFIG_NET_ESTIMATOR
	458	if (tb[TCA_POLICE_AVRATE-1]) {
	459	if (RTA_PAYLOAD(tb[TCA_POLICE_AVRATE-1]) != sizeof(u32))
	460	goto failure;
	461	p->ewma_rate = (u32)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
	462	}
	463	#endif
	464	p->toks = p->burst = parm->burst;
	465	p->mtu = parm->mtu;
	466	if (p->mtu == 0) {
	467	p->mtu = ~0;
	468	if (p->R_tab)
	469	p->mtu = 255<<p->R_tab->rate.cell_log;
	470	}
	471	if (p->P_tab)
	472	p->ptoks = L2T_P(p, p->mtu);
	473	PSCHED_GET_TIME(p->t_c);
	474	p->index = parm->index ? : tcf_police_new_index();
475	p->action = parm->action;
476	#ifdef CONFIG_NET_ESTIMATOR
477	if (est)
478	gen_new_estimator(&p->bstats, &p->rate_est, p->stats_lock, est);
479	#endif
480	h = tcf_police_hash(p->index);
481	write_lock_bh(&police_lock);
482	p->next = tcf_police_ht[h];
483	tcf_police_ht[h] = p;
484	write_unlock_bh(&police_lock);
485	return p;
486
487	failure:
488	if (p->R_tab)
489	qdisc_put_rtab(p->R_tab);
490	kfree(p);
491	return NULL;
492	}
493
494	int tcf_police(struct sk_buff skb, struct tcf_police p)
495	{
496	psched_time_t now;
497	long toks;
498	long ptoks = 0;
499
500	spin_lock(&p->lock);
501
502	p->bstats.bytes += skb->len;
503	p->bstats.packets++;
504
505	#ifdef CONFIG_NET_ESTIMATOR
506	if (p->ewma_rate && p->rate_est.bps >= p->ewma_rate) {
507	p->qstats.overlimits++;
508	spin_unlock(&p->lock);
509	return p->action;
510	}
511	#endif
512
513	if (skb->len <= p->mtu) {
514	if (p->R_tab == NULL) {
515	spin_unlock(&p->lock);
516	return p->result;
517	}
518
519	PSCHED_GET_TIME(now);
520
521	toks = PSCHED_TDIFF_SAFE(now, p->t_c, p->burst);
522
523	if (p->P_tab) {
524	ptoks = toks + p->ptoks;
525	if (ptoks > (long)L2T_P(p, p->mtu))
526	ptoks = (long)L2T_P(p, p->mtu);
527	ptoks -= L2T_P(p, skb->len);
528	}
529	toks += p->toks;
530	if (toks > (long)p->burst)
531	toks = p->burst;
532	toks -= L2T(p, skb->len);
533
534	if ((toks\|ptoks) >= 0) {
535	p->t_c = now;
536	p->toks = toks;
537	p->ptoks = ptoks;
538	spin_unlock(&p->lock);
539	return p->result;
540	}
541	}
542
543	p->qstats.overlimits++;
544	spin_unlock(&p->lock);
545	return p->action;
546	}
31bd06eb	547	EXPORT_SYMBOL(tcf_police);
1da177e4 LT	548
	549	int tcf_police_dump(struct sk_buff skb, struct tcf_police p)
	550	{
	551	unsigned char *b = skb->tail;
	552	struct tc_police opt;
	553
	554	opt.index = p->index;
	555	opt.action = p->action;
	556	opt.mtu = p->mtu;
	557	opt.burst = p->burst;
	558	if (p->R_tab)
	559	opt.rate = p->R_tab->rate;
	560	else
	561	memset(&opt.rate, 0, sizeof(opt.rate));
	562	if (p->P_tab)
	563	opt.peakrate = p->P_tab->rate;
	564	else
	565	memset(&opt.peakrate, 0, sizeof(opt.peakrate));
	566	RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
	567	if (p->result)
	568	RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int), &p->result);
	569	#ifdef CONFIG_NET_ESTIMATOR
	570	if (p->ewma_rate)
	571	RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &p->ewma_rate);
	572	#endif
	573	return skb->len;
	574
	575	rtattr_failure:
	576	skb_trim(skb, b - skb->data);
	577	return -1;
	578	}
	579
	580	int tcf_police_dump_stats(struct sk_buff skb, struct tcf_police p)
	581	{
	582	struct gnet_dump d;
	583
	584	if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
	585	TCA_XSTATS, p->stats_lock, &d) < 0)
	586	goto errout;
	587
	588	if (gnet_stats_copy_basic(&d, &p->bstats) < 0 \|\|
	589	#ifdef CONFIG_NET_ESTIMATOR
	590	gnet_stats_copy_rate_est(&d, &p->rate_est) < 0 \|\|
	591	#endif
	592	gnet_stats_copy_queue(&d, &p->qstats) < 0)
	593	goto errout;
	594
	595	if (gnet_stats_finish_copy(&d) < 0)
	596	goto errout;
	597
	598	return 0;
	599
	600	errout:
	601	return -1;
	602	}
	603
31bd06eb	604	#endif /* CONFIG_NET_CLS_ACT */