[deliverable/linux.git] / net / sched / 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 <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_generic_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_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 **pskb, struct tc_action *a,
                          struct tcf_result *res)
{
	psched_time_t now;
	struct sk_buff *skb = *pskb;
	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_hash_search,
	.init		=	tcf_act_police_locate,
	.walk		=	tcf_generic_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);

#endif

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;
}

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;
}


EXPORT_SYMBOL(tcf_police);
EXPORT_SYMBOL(tcf_police_destroy);
EXPORT_SYMBOL(tcf_police_dump);
EXPORT_SYMBOL(tcf_police_dump_stats);
EXPORT_SYMBOL(tcf_police_hash);
EXPORT_SYMBOL(tcf_police_ht);
EXPORT_SYMBOL(tcf_police_locate);
EXPORT_SYMBOL(tcf_police_lookup);
EXPORT_SYMBOL(tcf_police_new_index);
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
	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
69	static int tcf_generic_walker(struct sk_buff skb, struct netlink_callback cb,
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
116	tcf_hash_search(struct tc_action *a, u32 index)
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
abc3bc58 PM	287	static int tcf_act_police(struct sk_buff *pskb, struct tc_action a,
abc3bc58 PM	288	struct tcf_result *res)
1da177e4 LT	289	{
	290	psched_time_t now;
	291	struct sk_buff skb = pskb;
	292	struct tcf_police *p = PRIV(a);
	293	long toks;
	294	long ptoks = 0;
	295
	296	spin_lock(&p->lock);
	297
	298	p->bstats.bytes += skb->len;
	299	p->bstats.packets++;
	300
	301	#ifdef CONFIG_NET_ESTIMATOR
	302	if (p->ewma_rate && p->rate_est.bps >= p->ewma_rate) {
	303	p->qstats.overlimits++;
	304	spin_unlock(&p->lock);
	305	return p->action;
	306	}
	307	#endif
	308
	309	if (skb->len <= p->mtu) {
	310	if (p->R_tab == NULL) {
	311	spin_unlock(&p->lock);
	312	return p->result;
	313	}
	314
	315	PSCHED_GET_TIME(now);
	316
	317	toks = PSCHED_TDIFF_SAFE(now, p->t_c, p->burst);
	318
	319	if (p->P_tab) {
	320	ptoks = toks + p->ptoks;
	321	if (ptoks > (long)L2T_P(p, p->mtu))
	322	ptoks = (long)L2T_P(p, p->mtu);
	323	ptoks -= L2T_P(p, skb->len);
	324	}
	325	toks += p->toks;
	326	if (toks > (long)p->burst)
	327	toks = p->burst;
	328	toks -= L2T(p, skb->len);
	329
	330	if ((toks\|ptoks) >= 0) {
	331	p->t_c = now;
	332	p->toks = toks;
	333	p->ptoks = ptoks;
	334	spin_unlock(&p->lock);
	335	return p->result;
	336	}
	337	}
	338
	339	p->qstats.overlimits++;
	340	spin_unlock(&p->lock);
	341	return p->action;
	342	}
	343
	344	static int
	345	tcf_act_police_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
	346	{
	347	unsigned char *b = skb->tail;
	348	struct tc_police opt;
	349	struct tcf_police *p = PRIV(a);
	350
	351	opt.index = p->index;
	352	opt.action = p->action;
353	opt.mtu = p->mtu;
354	opt.burst = p->burst;
355	opt.refcnt = p->refcnt - ref;
356	opt.bindcnt = p->bindcnt - bind;
357	if (p->R_tab)
358	opt.rate = p->R_tab->rate;
359	else
360	memset(&opt.rate, 0, sizeof(opt.rate));
361	if (p->P_tab)
362	opt.peakrate = p->P_tab->rate;
363	else
364	memset(&opt.peakrate, 0, sizeof(opt.peakrate));
365	RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
366	if (p->result)
367	RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int), &p->result);
368	#ifdef CONFIG_NET_ESTIMATOR
369	if (p->ewma_rate)
370	RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &p->ewma_rate);
371	#endif
372	return skb->len;
373
374	rtattr_failure:
375	skb_trim(skb, b - skb->data);
376	return -1;
377	}
378
379	MODULE_AUTHOR("Alexey Kuznetsov");
380	MODULE_DESCRIPTION("Policing actions");
381	MODULE_LICENSE("GPL");
382
383	static struct tc_action_ops act_police_ops = {
384	.kind = "police",
385	.type = TCA_ID_POLICE,
386	.capab = TCA_CAP_NONE,
387	.owner = THIS_MODULE,
388	.act = tcf_act_police,
389	.dump = tcf_act_police_dump,
390	.cleanup = tcf_act_police_cleanup,
391	.lookup = tcf_hash_search,
392	.init = tcf_act_police_locate,
393	.walk = tcf_generic_walker
394	};
395
396	static int __init
397	police_init_module(void)
398	{
399	return tcf_register_action(&act_police_ops);
400	}
401
402	static void __exit
403	police_cleanup_module(void)
404	{
405	tcf_unregister_action(&act_police_ops);
406	}
407
408	module_init(police_init_module);
409	module_exit(police_cleanup_module);
410
411	#endif
412
413	struct tcf_police * tcf_police_locate(struct rtattr rta, struct rtattr est)
414	{
415	unsigned h;
416	struct tcf_police *p;
417	struct rtattr *tb[TCA_POLICE_MAX];
418	struct tc_police *parm;
419
420	if (rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
421	return NULL;
422
423	if (tb[TCA_POLICE_TBF-1] == NULL \|\|
424	RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]) != sizeof(*parm))
425	return NULL;
426
427	parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
428
429	if (parm->index && (p = tcf_police_lookup(parm->index)) != NULL) {
430	p->refcnt++;
431	return p;
432	}
433
434	p = kmalloc(sizeof(*p), GFP_KERNEL);
435	if (p == NULL)
436	return NULL;
437
438	memset(p, 0, sizeof(*p));
439	p->refcnt = 1;
440	spin_lock_init(&p->lock);
441	p->stats_lock = &p->lock;
442	if (parm->rate.rate) {
443	p->R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
444	if (p->R_tab == NULL)
445	goto failure;
446	if (parm->peakrate.rate) {
447	p->P_tab = qdisc_get_rtab(&parm->peakrate,
448	tb[TCA_POLICE_PEAKRATE-1]);
449	if (p->P_tab == NULL)
450	goto failure;
451	}
452	}
453	if (tb[TCA_POLICE_RESULT-1]) {
454	if (RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
455	goto failure;
456	p->result = (u32)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
457	}
458	#ifdef CONFIG_NET_ESTIMATOR
459	if (tb[TCA_POLICE_AVRATE-1]) {
460	if (RTA_PAYLOAD(tb[TCA_POLICE_AVRATE-1]) != sizeof(u32))
461	goto failure;
462	p->ewma_rate = (u32)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
463	}
464	#endif
465	p->toks = p->burst = parm->burst;
466	p->mtu = parm->mtu;
467	if (p->mtu == 0) {
468	p->mtu = ~0;
469	if (p->R_tab)
470	p->mtu = 255<<p->R_tab->rate.cell_log;
471	}
472	if (p->P_tab)
473	p->ptoks = L2T_P(p, p->mtu);
474	PSCHED_GET_TIME(p->t_c);
475	p->index = parm->index ? : tcf_police_new_index();
476	p->action = parm->action;
477	#ifdef CONFIG_NET_ESTIMATOR
478	if (est)
479	gen_new_estimator(&p->bstats, &p->rate_est, p->stats_lock, est);
480	#endif
481	h = tcf_police_hash(p->index);
482	write_lock_bh(&police_lock);
483	p->next = tcf_police_ht[h];
484	tcf_police_ht[h] = p;
485	write_unlock_bh(&police_lock);
486	return p;
487
488	failure:
489	if (p->R_tab)
490	qdisc_put_rtab(p->R_tab);
491	kfree(p);
492	return NULL;
493	}
494
495	int tcf_police(struct sk_buff skb, struct tcf_police p)
496	{
497	psched_time_t now;
498	long toks;
499	long ptoks = 0;
500
501	spin_lock(&p->lock);
502
503	p->bstats.bytes += skb->len;
504	p->bstats.packets++;
505
506	#ifdef CONFIG_NET_ESTIMATOR
507	if (p->ewma_rate && p->rate_est.bps >= p->ewma_rate) {
508	p->qstats.overlimits++;
509	spin_unlock(&p->lock);
510	return p->action;
511	}
512	#endif
513
514	if (skb->len <= p->mtu) {
515	if (p->R_tab == NULL) {
516	spin_unlock(&p->lock);
517	return p->result;
518	}
519
520	PSCHED_GET_TIME(now);
521
522	toks = PSCHED_TDIFF_SAFE(now, p->t_c, p->burst);
523
524	if (p->P_tab) {
525	ptoks = toks + p->ptoks;
526	if (ptoks > (long)L2T_P(p, p->mtu))
527	ptoks = (long)L2T_P(p, p->mtu);
528	ptoks -= L2T_P(p, skb->len);
529	}
530	toks += p->toks;
531	if (toks > (long)p->burst)
532	toks = p->burst;
533	toks -= L2T(p, skb->len);
534
535	if ((toks\|ptoks) >= 0) {
536	p->t_c = now;
537	p->toks = toks;
538	p->ptoks = ptoks;
539	spin_unlock(&p->lock);
540	return p->result;
541	}
542	}
543
544	p->qstats.overlimits++;
545	spin_unlock(&p->lock);
546	return p->action;
547	}
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
604
605	EXPORT_SYMBOL(tcf_police);
606	EXPORT_SYMBOL(tcf_police_destroy);
607	EXPORT_SYMBOL(tcf_police_dump);
608	EXPORT_SYMBOL(tcf_police_dump_stats);
609	EXPORT_SYMBOL(tcf_police_hash);
610	EXPORT_SYMBOL(tcf_police_ht);
611	EXPORT_SYMBOL(tcf_police_locate);
612	EXPORT_SYMBOL(tcf_police_lookup);
613	EXPORT_SYMBOL(tcf_police_new_index);