1 files changed, 612 insertions, 0 deletions

diff --git a/net/sched/police.c b/net/sched/police.c
new file mode 100644
index 0000000..c03545f
--- /dev/null
+++ b/net/sched/police.c
@@ -0,0 +1,612 @@
+/*
+ * 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)
+{
+	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);