Initial import

1 files changed, 1075 insertions, 0 deletions

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
new file mode 100644
index 000000000..cab9e9b43
--- /dev/null
+++ b/net/sched/cls_u32.c
@@ -0,0 +1,1075 @@
+/*
+ * net/sched/cls_u32.c	Ugly (or Universal) 32bit key Packet Classifier.
+ *
+ *		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>
+ *
+ *	The filters are packed to hash tables of key nodes
+ *	with a set of 32bit key/mask pairs at every node.
+ *	Nodes reference next level hash tables etc.
+ *
+ *	This scheme is the best universal classifier I managed to
+ *	invent; it is not super-fast, but it is not slow (provided you
+ *	program it correctly), and general enough.  And its relative
+ *	speed grows as the number of rules becomes larger.
+ *
+ *	It seems that it represents the best middle point between
+ *	speed and manageability both by human and by machine.
+ *
+ *	It is especially useful for link sharing combined with QoS;
+ *	pure RSVP doesn't need such a general approach and can use
+ *	much simpler (and faster) schemes, sort of cls_rsvp.c.
+ *
+ *	JHS: We should remove the CONFIG_NET_CLS_IND from here
+ *	eventually when the meta match extension is made available
+ *
+ *	nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/percpu.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+#include <linux/bitmap.h>
+#include <net/netlink.h>
+#include <net/act_api.h>
+#include <net/pkt_cls.h>
+
+struct tc_u_knode {
+	struct tc_u_knode __rcu	*next;
+	u32			handle;
+	struct tc_u_hnode __rcu	*ht_up;
+	struct tcf_exts		exts;
+#ifdef CONFIG_NET_CLS_IND
+	int			ifindex;
+#endif
+	u8			fshift;
+	struct tcf_result	res;
+	struct tc_u_hnode __rcu	*ht_down;
+#ifdef CONFIG_CLS_U32_PERF
+	struct tc_u32_pcnt __percpu *pf;
+#endif
+#ifdef CONFIG_CLS_U32_MARK
+	u32			val;
+	u32			mask;
+	u32 __percpu		*pcpu_success;
+#endif
+	struct tcf_proto	*tp;
+	struct rcu_head		rcu;
+	/* The 'sel' field MUST be the last field in structure to allow for
+	 * tc_u32_keys allocated at end of structure.
+	 */
+	struct tc_u32_sel	sel;
+};
+
+struct tc_u_hnode {
+	struct tc_u_hnode __rcu	*next;
+	u32			handle;
+	u32			prio;
+	struct tc_u_common	*tp_c;
+	int			refcnt;
+	unsigned int		divisor;
+	struct rcu_head		rcu;
+	/* The 'ht' field MUST be the last field in structure to allow for
+	 * more entries allocated at end of structure.
+	 */
+	struct tc_u_knode __rcu	*ht[1];
+};
+
+struct tc_u_common {
+	struct tc_u_hnode __rcu	*hlist;
+	struct Qdisc		*q;
+	int			refcnt;
+	u32			hgenerator;
+	struct rcu_head		rcu;
+};
+
+static inline unsigned int u32_hash_fold(__be32 key,
+					 const struct tc_u32_sel *sel,
+					 u8 fshift)
+{
+	unsigned int h = ntohl(key & sel->hmask) >> fshift;
+
+	return h;
+}
+
+static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res)
+{
+	struct {
+		struct tc_u_knode *knode;
+		unsigned int	  off;
+	} stack[TC_U32_MAXDEPTH];
+
+	struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
+	unsigned int off = skb_network_offset(skb);
+	struct tc_u_knode *n;
+	int sdepth = 0;
+	int off2 = 0;
+	int sel = 0;
+#ifdef CONFIG_CLS_U32_PERF
+	int j;
+#endif
+	int i, r;
+
+next_ht:
+	n = rcu_dereference_bh(ht->ht[sel]);
+
+next_knode:
+	if (n) {
+		struct tc_u32_key *key = n->sel.keys;
+
+#ifdef CONFIG_CLS_U32_PERF
+		__this_cpu_inc(n->pf->rcnt);
+		j = 0;
+#endif
+
+#ifdef CONFIG_CLS_U32_MARK
+		if ((skb->mark & n->mask) != n->val) {
+			n = rcu_dereference_bh(n->next);
+			goto next_knode;
+		} else {
+			__this_cpu_inc(*n->pcpu_success);
+		}
+#endif
+
+		for (i = n->sel.nkeys; i > 0; i--, key++) {
+			int toff = off + key->off + (off2 & key->offmask);
+			__be32 *data, hdata;
+
+			if (skb_headroom(skb) + toff > INT_MAX)
+				goto out;
+
+			data = skb_header_pointer(skb, toff, 4, &hdata);
+			if (!data)
+				goto out;
+			if ((*data ^ key->val) & key->mask) {
+				n = rcu_dereference_bh(n->next);
+				goto next_knode;
+			}
+#ifdef CONFIG_CLS_U32_PERF
+			__this_cpu_inc(n->pf->kcnts[j]);
+			j++;
+#endif
+		}
+
+		ht = rcu_dereference_bh(n->ht_down);
+		if (!ht) {
+check_terminal:
+			if (n->sel.flags & TC_U32_TERMINAL) {
+
+				*res = n->res;
+#ifdef CONFIG_NET_CLS_IND
+				if (!tcf_match_indev(skb, n->ifindex)) {
+					n = rcu_dereference_bh(n->next);
+					goto next_knode;
+				}
+#endif
+#ifdef CONFIG_CLS_U32_PERF
+				__this_cpu_inc(n->pf->rhit);
+#endif
+				r = tcf_exts_exec(skb, &n->exts, res);
+				if (r < 0) {
+					n = rcu_dereference_bh(n->next);
+					goto next_knode;
+				}
+
+				return r;
+			}
+			n = rcu_dereference_bh(n->next);
+			goto next_knode;
+		}
+
+		/* PUSH */
+		if (sdepth >= TC_U32_MAXDEPTH)
+			goto deadloop;
+		stack[sdepth].knode = n;
+		stack[sdepth].off = off;
+		sdepth++;
+
+		ht = rcu_dereference_bh(n->ht_down);
+		sel = 0;
+		if (ht->divisor) {
+			__be32 *data, hdata;
+
+			data = skb_header_pointer(skb, off + n->sel.hoff, 4,
+						  &hdata);
+			if (!data)
+				goto out;
+			sel = ht->divisor & u32_hash_fold(*data, &n->sel,
+							  n->fshift);
+		}
+		if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
+			goto next_ht;
+
+		if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
+			off2 = n->sel.off + 3;
+			if (n->sel.flags & TC_U32_VAROFFSET) {
+				__be16 *data, hdata;
+
+				data = skb_header_pointer(skb,
+							  off + n->sel.offoff,
+							  2, &hdata);
+				if (!data)
+					goto out;
+				off2 += ntohs(n->sel.offmask & *data) >>
+					n->sel.offshift;
+			}
+			off2 &= ~3;
+		}
+		if (n->sel.flags & TC_U32_EAT) {
+			off += off2;
+			off2 = 0;
+		}
+
+		if (off < skb->len)
+			goto next_ht;
+	}
+
+	/* POP */
+	if (sdepth--) {
+		n = stack[sdepth].knode;
+		ht = rcu_dereference_bh(n->ht_up);
+		off = stack[sdepth].off;
+		goto check_terminal;
+	}
+out:
+	return -1;
+
+deadloop:
+	net_warn_ratelimited("cls_u32: dead loop\n");
+	return -1;
+}
+
+static struct tc_u_hnode *
+u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
+{
+	struct tc_u_hnode *ht;
+
+	for (ht = rtnl_dereference(tp_c->hlist);
+	     ht;
+	     ht = rtnl_dereference(ht->next))
+		if (ht->handle == handle)
+			break;
+
+	return ht;
+}
+
+static struct tc_u_knode *
+u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
+{
+	unsigned int sel;
+	struct tc_u_knode *n = NULL;
+
+	sel = TC_U32_HASH(handle);
+	if (sel > ht->divisor)
+		goto out;
+
+	for (n = rtnl_dereference(ht->ht[sel]);
+	     n;
+	     n = rtnl_dereference(n->next))
+		if (n->handle == handle)
+			break;
+out:
+	return n;
+}
+
+
+static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
+{
+	struct tc_u_hnode *ht;
+	struct tc_u_common *tp_c = tp->data;
+
+	if (TC_U32_HTID(handle) == TC_U32_ROOT)
+		ht = rtnl_dereference(tp->root);
+	else
+		ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
+
+	if (!ht)
+		return 0;
+
+	if (TC_U32_KEY(handle) == 0)
+		return (unsigned long)ht;
+
+	return (unsigned long)u32_lookup_key(ht, handle);
+}
+
+static u32 gen_new_htid(struct tc_u_common *tp_c)
+{
+	int i = 0x800;
+
+	/* hgenerator only used inside rtnl lock it is safe to increment
+	 * without read _copy_ update semantics
+	 */
+	do {
+		if (++tp_c->hgenerator == 0x7FF)
+			tp_c->hgenerator = 1;
+	} while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
+
+	return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
+}
+
+static int u32_init(struct tcf_proto *tp)
+{
+	struct tc_u_hnode *root_ht;
+	struct tc_u_common *tp_c;
+
+	tp_c = tp->q->u32_node;
+
+	root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
+	if (root_ht == NULL)
+		return -ENOBUFS;
+
+	root_ht->divisor = 0;
+	root_ht->refcnt++;
+	root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
+	root_ht->prio = tp->prio;
+
+	if (tp_c == NULL) {
+		tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
+		if (tp_c == NULL) {
+			kfree(root_ht);
+			return -ENOBUFS;
+		}
+		tp_c->q = tp->q;
+		tp->q->u32_node = tp_c;
+	}
+
+	tp_c->refcnt++;
+	RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
+	rcu_assign_pointer(tp_c->hlist, root_ht);
+	root_ht->tp_c = tp_c;
+
+	rcu_assign_pointer(tp->root, root_ht);
+	tp->data = tp_c;
+	return 0;
+}
+
+static int u32_destroy_key(struct tcf_proto *tp,
+			   struct tc_u_knode *n,
+			   bool free_pf)
+{
+	tcf_exts_destroy(&n->exts);
+	if (n->ht_down)
+		n->ht_down->refcnt--;
+#ifdef CONFIG_CLS_U32_PERF
+	if (free_pf)
+		free_percpu(n->pf);
+#endif
+#ifdef CONFIG_CLS_U32_MARK
+	if (free_pf)
+		free_percpu(n->pcpu_success);
+#endif
+	kfree(n);
+	return 0;
+}
+
+/* u32_delete_key_rcu should be called when free'ing a copied
+ * version of a tc_u_knode obtained from u32_init_knode(). When
+ * copies are obtained from u32_init_knode() the statistics are
+ * shared between the old and new copies to allow readers to
+ * continue to update the statistics during the copy. To support
+ * this the u32_delete_key_rcu variant does not free the percpu
+ * statistics.
+ */
+static void u32_delete_key_rcu(struct rcu_head *rcu)
+{
+	struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
+
+	u32_destroy_key(key->tp, key, false);
+}
+
+/* u32_delete_key_freepf_rcu is the rcu callback variant
+ * that free's the entire structure including the statistics
+ * percpu variables. Only use this if the key is not a copy
+ * returned by u32_init_knode(). See u32_delete_key_rcu()
+ * for the variant that should be used with keys return from
+ * u32_init_knode()
+ */
+static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
+{
+	struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
+
+	u32_destroy_key(key->tp, key, true);
+}
+
+static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
+{
+	struct tc_u_knode __rcu **kp;
+	struct tc_u_knode *pkp;
+	struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
+
+	if (ht) {
+		kp = &ht->ht[TC_U32_HASH(key->handle)];
+		for (pkp = rtnl_dereference(*kp); pkp;
+		     kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
+			if (pkp == key) {
+				RCU_INIT_POINTER(*kp, key->next);
+
+				tcf_unbind_filter(tp, &key->res);
+				call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
+				return 0;
+			}
+		}
+	}
+	WARN_ON(1);
+	return 0;
+}
+
+static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
+{
+	struct tc_u_knode *n;
+	unsigned int h;
+
+	for (h = 0; h <= ht->divisor; h++) {
+		while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
+			RCU_INIT_POINTER(ht->ht[h],
+					 rtnl_dereference(n->next));
+			tcf_unbind_filter(tp, &n->res);
+			call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
+		}
+	}
+}
+
+static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
+{
+	struct tc_u_common *tp_c = tp->data;
+	struct tc_u_hnode __rcu **hn;
+	struct tc_u_hnode *phn;
+
+	WARN_ON(ht->refcnt);
+
+	u32_clear_hnode(tp, ht);
+
+	hn = &tp_c->hlist;
+	for (phn = rtnl_dereference(*hn);
+	     phn;
+	     hn = &phn->next, phn = rtnl_dereference(*hn)) {
+		if (phn == ht) {
+			RCU_INIT_POINTER(*hn, ht->next);
+			kfree_rcu(ht, rcu);
+			return 0;
+		}
+	}
+
+	return -ENOENT;
+}
+
+static bool ht_empty(struct tc_u_hnode *ht)
+{
+	unsigned int h;
+
+	for (h = 0; h <= ht->divisor; h++)
+		if (rcu_access_pointer(ht->ht[h]))
+			return false;
+
+	return true;
+}
+
+static bool u32_destroy(struct tcf_proto *tp, bool force)
+{
+	struct tc_u_common *tp_c = tp->data;
+	struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
+
+	WARN_ON(root_ht == NULL);
+
+	if (!force) {
+		if (root_ht) {
+			if (root_ht->refcnt > 1)
+				return false;
+			if (root_ht->refcnt == 1) {
+				if (!ht_empty(root_ht))
+					return false;
+			}
+		}
+	}
+
+	if (root_ht && --root_ht->refcnt == 0)
+		u32_destroy_hnode(tp, root_ht);
+
+	if (--tp_c->refcnt == 0) {
+		struct tc_u_hnode *ht;
+
+		tp->q->u32_node = NULL;
+
+		for (ht = rtnl_dereference(tp_c->hlist);
+		     ht;
+		     ht = rtnl_dereference(ht->next)) {
+			ht->refcnt--;
+			u32_clear_hnode(tp, ht);
+		}
+
+		while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
+			RCU_INIT_POINTER(tp_c->hlist, ht->next);
+			kfree_rcu(ht, rcu);
+		}
+
+		kfree(tp_c);
+	}
+
+	tp->data = NULL;
+	return true;
+}
+
+static int u32_delete(struct tcf_proto *tp, unsigned long arg)
+{
+	struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
+	struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
+
+	if (ht == NULL)
+		return 0;
+
+	if (TC_U32_KEY(ht->handle))
+		return u32_delete_key(tp, (struct tc_u_knode *)ht);
+
+	if (root_ht == ht)
+		return -EINVAL;
+
+	if (ht->refcnt == 1) {
+		ht->refcnt--;
+		u32_destroy_hnode(tp, ht);
+	} else {
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+#define NR_U32_NODE (1<<12)
+static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
+{
+	struct tc_u_knode *n;
+	unsigned long i;
+	unsigned long *bitmap = kzalloc(BITS_TO_LONGS(NR_U32_NODE) * sizeof(unsigned long),
+					GFP_KERNEL);
+	if (!bitmap)
+		return handle | 0xFFF;
+
+	for (n = rtnl_dereference(ht->ht[TC_U32_HASH(handle)]);
+	     n;
+	     n = rtnl_dereference(n->next))
+		set_bit(TC_U32_NODE(n->handle), bitmap);
+
+	i = find_next_zero_bit(bitmap, NR_U32_NODE, 0x800);
+	if (i >= NR_U32_NODE)
+		i = find_next_zero_bit(bitmap, NR_U32_NODE, 1);
+
+	kfree(bitmap);
+	return handle | (i >= NR_U32_NODE ? 0xFFF : i);
+}
+
+static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
+	[TCA_U32_CLASSID]	= { .type = NLA_U32 },
+	[TCA_U32_HASH]		= { .type = NLA_U32 },
+	[TCA_U32_LINK]		= { .type = NLA_U32 },
+	[TCA_U32_DIVISOR]	= { .type = NLA_U32 },
+	[TCA_U32_SEL]		= { .len = sizeof(struct tc_u32_sel) },
+	[TCA_U32_INDEV]		= { .type = NLA_STRING, .len = IFNAMSIZ },
+	[TCA_U32_MARK]		= { .len = sizeof(struct tc_u32_mark) },
+};
+
+static int u32_set_parms(struct net *net, struct tcf_proto *tp,
+			 unsigned long base, struct tc_u_hnode *ht,
+			 struct tc_u_knode *n, struct nlattr **tb,
+			 struct nlattr *est, bool ovr)
+{
+	int err;
+	struct tcf_exts e;
+
+	tcf_exts_init(&e, TCA_U32_ACT, TCA_U32_POLICE);
+	err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
+	if (err < 0)
+		return err;
+
+	err = -EINVAL;
+	if (tb[TCA_U32_LINK]) {
+		u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
+		struct tc_u_hnode *ht_down = NULL, *ht_old;
+
+		if (TC_U32_KEY(handle))
+			goto errout;
+
+		if (handle) {
+			ht_down = u32_lookup_ht(ht->tp_c, handle);
+
+			if (ht_down == NULL)
+				goto errout;
+			ht_down->refcnt++;
+		}
+
+		ht_old = rtnl_dereference(n->ht_down);
+		rcu_assign_pointer(n->ht_down, ht_down);
+
+		if (ht_old)
+			ht_old->refcnt--;
+	}
+	if (tb[TCA_U32_CLASSID]) {
+		n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
+		tcf_bind_filter(tp, &n->res, base);
+	}
+
+#ifdef CONFIG_NET_CLS_IND
+	if (tb[TCA_U32_INDEV]) {
+		int ret;
+		ret = tcf_change_indev(net, tb[TCA_U32_INDEV]);
+		if (ret < 0)
+			goto errout;
+		n->ifindex = ret;
+	}
+#endif
+	tcf_exts_change(tp, &n->exts, &e);
+
+	return 0;
+errout:
+	tcf_exts_destroy(&e);
+	return err;
+}
+
+static void u32_replace_knode(struct tcf_proto *tp,
+			      struct tc_u_common *tp_c,
+			      struct tc_u_knode *n)
+{
+	struct tc_u_knode __rcu **ins;
+	struct tc_u_knode *pins;
+	struct tc_u_hnode *ht;
+
+	if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
+		ht = rtnl_dereference(tp->root);
+	else
+		ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
+
+	ins = &ht->ht[TC_U32_HASH(n->handle)];
+
+	/* The node must always exist for it to be replaced if this is not the
+	 * case then something went very wrong elsewhere.
+	 */
+	for (pins = rtnl_dereference(*ins); ;
+	     ins = &pins->next, pins = rtnl_dereference(*ins))
+		if (pins->handle == n->handle)
+			break;
+
+	RCU_INIT_POINTER(n->next, pins->next);
+	rcu_assign_pointer(*ins, n);
+}
+
+static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
+					 struct tc_u_knode *n)
+{
+	struct tc_u_knode *new;
+	struct tc_u32_sel *s = &n->sel;
+
+	new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
+		      GFP_KERNEL);
+
+	if (!new)
+		return NULL;
+
+	RCU_INIT_POINTER(new->next, n->next);
+	new->handle = n->handle;
+	RCU_INIT_POINTER(new->ht_up, n->ht_up);
+
+#ifdef CONFIG_NET_CLS_IND
+	new->ifindex = n->ifindex;
+#endif
+	new->fshift = n->fshift;
+	new->res = n->res;
+	RCU_INIT_POINTER(new->ht_down, n->ht_down);
+
+	/* bump reference count as long as we hold pointer to structure */
+	if (new->ht_down)
+		new->ht_down->refcnt++;
+
+#ifdef CONFIG_CLS_U32_PERF
+	/* Statistics may be incremented by readers during update
+	 * so we must keep them in tact. When the node is later destroyed
+	 * a special destroy call must be made to not free the pf memory.
+	 */
+	new->pf = n->pf;
+#endif
+
+#ifdef CONFIG_CLS_U32_MARK
+	new->val = n->val;
+	new->mask = n->mask;
+	/* Similarly success statistics must be moved as pointers */
+	new->pcpu_success = n->pcpu_success;
+#endif
+	new->tp = tp;
+	memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
+
+	tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE);
+
+	return new;
+}
+
+static int u32_change(struct net *net, struct sk_buff *in_skb,
+		      struct tcf_proto *tp, unsigned long base, u32 handle,
+		      struct nlattr **tca,
+		      unsigned long *arg, bool ovr)
+{
+	struct tc_u_common *tp_c = tp->data;
+	struct tc_u_hnode *ht;
+	struct tc_u_knode *n;
+	struct tc_u32_sel *s;
+	struct nlattr *opt = tca[TCA_OPTIONS];
+	struct nlattr *tb[TCA_U32_MAX + 1];
+	u32 htid;
+	int err;
+#ifdef CONFIG_CLS_U32_PERF
+	size_t size;
+#endif
+
+	if (opt == NULL)
+		return handle ? -EINVAL : 0;
+
+	err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
+	if (err < 0)
+		return err;
+
+	n = (struct tc_u_knode *)*arg;
+	if (n) {
+		struct tc_u_knode *new;
+
+		if (TC_U32_KEY(n->handle) == 0)
+			return -EINVAL;
+
+		new = u32_init_knode(tp, n);
+		if (!new)
+			return -ENOMEM;
+
+		err = u32_set_parms(net, tp, base,
+				    rtnl_dereference(n->ht_up), new, tb,
+				    tca[TCA_RATE], ovr);
+
+		if (err) {
+			u32_destroy_key(tp, new, false);
+			return err;
+		}
+
+		u32_replace_knode(tp, tp_c, new);
+		tcf_unbind_filter(tp, &n->res);
+		call_rcu(&n->rcu, u32_delete_key_rcu);
+		return 0;
+	}
+
+	if (tb[TCA_U32_DIVISOR]) {
+		unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
+
+		if (--divisor > 0x100)
+			return -EINVAL;
+		if (TC_U32_KEY(handle))
+			return -EINVAL;
+		if (handle == 0) {
+			handle = gen_new_htid(tp->data);
+			if (handle == 0)
+				return -ENOMEM;
+		}
+		ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
+		if (ht == NULL)
+			return -ENOBUFS;
+		ht->tp_c = tp_c;
+		ht->refcnt = 1;
+		ht->divisor = divisor;
+		ht->handle = handle;
+		ht->prio = tp->prio;
+		RCU_INIT_POINTER(ht->next, tp_c->hlist);
+		rcu_assign_pointer(tp_c->hlist, ht);
+		*arg = (unsigned long)ht;
+		return 0;
+	}
+
+	if (tb[TCA_U32_HASH]) {
+		htid = nla_get_u32(tb[TCA_U32_HASH]);
+		if (TC_U32_HTID(htid) == TC_U32_ROOT) {
+			ht = rtnl_dereference(tp->root);
+			htid = ht->handle;
+		} else {
+			ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
+			if (ht == NULL)
+				return -EINVAL;
+		}
+	} else {
+		ht = rtnl_dereference(tp->root);
+		htid = ht->handle;
+	}
+
+	if (ht->divisor < TC_U32_HASH(htid))
+		return -EINVAL;
+
+	if (handle) {
+		if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
+			return -EINVAL;
+		handle = htid | TC_U32_NODE(handle);
+	} else
+		handle = gen_new_kid(ht, htid);
+
+	if (tb[TCA_U32_SEL] == NULL)
+		return -EINVAL;
+
+	s = nla_data(tb[TCA_U32_SEL]);
+
+	n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
+	if (n == NULL)
+		return -ENOBUFS;
+
+#ifdef CONFIG_CLS_U32_PERF
+	size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
+	n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
+	if (!n->pf) {
+		kfree(n);
+		return -ENOBUFS;
+	}
+#endif
+
+	memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
+	RCU_INIT_POINTER(n->ht_up, ht);
+	n->handle = handle;
+	n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
+	tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
+	n->tp = tp;
+
+#ifdef CONFIG_CLS_U32_MARK
+	n->pcpu_success = alloc_percpu(u32);
+	if (!n->pcpu_success) {
+		err = -ENOMEM;
+		goto errout;
+	}
+
+	if (tb[TCA_U32_MARK]) {
+		struct tc_u32_mark *mark;
+
+		mark = nla_data(tb[TCA_U32_MARK]);
+		n->val = mark->val;
+		n->mask = mark->mask;
+	}
+#endif
+
+	err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr);
+	if (err == 0) {
+		struct tc_u_knode __rcu **ins;
+		struct tc_u_knode *pins;
+
+		ins = &ht->ht[TC_U32_HASH(handle)];
+		for (pins = rtnl_dereference(*ins); pins;
+		     ins = &pins->next, pins = rtnl_dereference(*ins))
+			if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
+				break;
+
+		RCU_INIT_POINTER(n->next, pins);
+		rcu_assign_pointer(*ins, n);
+
+		*arg = (unsigned long)n;
+		return 0;
+	}
+
+#ifdef CONFIG_CLS_U32_MARK
+	free_percpu(n->pcpu_success);
+errout:
+#endif
+
+#ifdef CONFIG_CLS_U32_PERF
+	free_percpu(n->pf);
+#endif
+	kfree(n);
+	return err;
+}
+
+static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
+{
+	struct tc_u_common *tp_c = tp->data;
+	struct tc_u_hnode *ht;
+	struct tc_u_knode *n;
+	unsigned int h;
+
+	if (arg->stop)
+		return;
+
+	for (ht = rtnl_dereference(tp_c->hlist);
+	     ht;
+	     ht = rtnl_dereference(ht->next)) {
+		if (ht->prio != tp->prio)
+			continue;
+		if (arg->count >= arg->skip) {
+			if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
+				arg->stop = 1;
+				return;
+			}
+		}
+		arg->count++;
+		for (h = 0; h <= ht->divisor; h++) {
+			for (n = rtnl_dereference(ht->ht[h]);
+			     n;
+			     n = rtnl_dereference(n->next)) {
+				if (arg->count < arg->skip) {
+					arg->count++;
+					continue;
+				}
+				if (arg->fn(tp, (unsigned long)n, arg) < 0) {
+					arg->stop = 1;
+					return;
+				}
+				arg->count++;
+			}
+		}
+	}
+}
+
+static int u32_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
+		     struct sk_buff *skb, struct tcmsg *t)
+{
+	struct tc_u_knode *n = (struct tc_u_knode *)fh;
+	struct tc_u_hnode *ht_up, *ht_down;
+	struct nlattr *nest;
+
+	if (n == NULL)
+		return skb->len;
+
+	t->tcm_handle = n->handle;
+
+	nest = nla_nest_start(skb, TCA_OPTIONS);
+	if (nest == NULL)
+		goto nla_put_failure;
+
+	if (TC_U32_KEY(n->handle) == 0) {
+		struct tc_u_hnode *ht = (struct tc_u_hnode *)fh;
+		u32 divisor = ht->divisor + 1;
+
+		if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
+			goto nla_put_failure;
+	} else {
+#ifdef CONFIG_CLS_U32_PERF
+		struct tc_u32_pcnt *gpf;
+		int cpu;
+#endif
+
+		if (nla_put(skb, TCA_U32_SEL,
+			    sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
+			    &n->sel))
+			goto nla_put_failure;
+
+		ht_up = rtnl_dereference(n->ht_up);
+		if (ht_up) {
+			u32 htid = n->handle & 0xFFFFF000;
+			if (nla_put_u32(skb, TCA_U32_HASH, htid))
+				goto nla_put_failure;
+		}
+		if (n->res.classid &&
+		    nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
+			goto nla_put_failure;
+
+		ht_down = rtnl_dereference(n->ht_down);
+		if (ht_down &&
+		    nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
+			goto nla_put_failure;
+
+#ifdef CONFIG_CLS_U32_MARK
+		if ((n->val || n->mask)) {
+			struct tc_u32_mark mark = {.val = n->val,
+						   .mask = n->mask,
+						   .success = 0};
+			int cpum;
+
+			for_each_possible_cpu(cpum) {
+				__u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
+
+				mark.success += cnt;
+			}
+
+			if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
+				goto nla_put_failure;
+		}
+#endif
+
+		if (tcf_exts_dump(skb, &n->exts) < 0)
+			goto nla_put_failure;
+
+#ifdef CONFIG_NET_CLS_IND
+		if (n->ifindex) {
+			struct net_device *dev;
+			dev = __dev_get_by_index(net, n->ifindex);
+			if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
+				goto nla_put_failure;
+		}
+#endif
+#ifdef CONFIG_CLS_U32_PERF
+		gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
+			      n->sel.nkeys * sizeof(u64),
+			      GFP_KERNEL);
+		if (!gpf)
+			goto nla_put_failure;
+
+		for_each_possible_cpu(cpu) {
+			int i;
+			struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
+
+			gpf->rcnt += pf->rcnt;
+			gpf->rhit += pf->rhit;
+			for (i = 0; i < n->sel.nkeys; i++)
+				gpf->kcnts[i] += pf->kcnts[i];
+		}
+
+		if (nla_put(skb, TCA_U32_PCNT,
+			    sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
+			    gpf)) {
+			kfree(gpf);
+			goto nla_put_failure;
+		}
+		kfree(gpf);
+#endif
+	}
+
+	nla_nest_end(skb, nest);
+
+	if (TC_U32_KEY(n->handle))
+		if (tcf_exts_dump_stats(skb, &n->exts) < 0)
+			goto nla_put_failure;
+	return skb->len;
+
+nla_put_failure:
+	nla_nest_cancel(skb, nest);
+	return -1;
+}
+
+static struct tcf_proto_ops cls_u32_ops __read_mostly = {
+	.kind		=	"u32",
+	.classify	=	u32_classify,
+	.init		=	u32_init,
+	.destroy	=	u32_destroy,
+	.get		=	u32_get,
+	.change		=	u32_change,
+	.delete		=	u32_delete,
+	.walk		=	u32_walk,
+	.dump		=	u32_dump,
+	.owner		=	THIS_MODULE,
+};
+
+static int __init init_u32(void)
+{
+	pr_info("u32 classifier\n");
+#ifdef CONFIG_CLS_U32_PERF
+	pr_info("    Performance counters on\n");
+#endif
+#ifdef CONFIG_NET_CLS_IND
+	pr_info("    input device check on\n");
+#endif
+#ifdef CONFIG_NET_CLS_ACT
+	pr_info("    Actions configured\n");
+#endif
+	return register_tcf_proto_ops(&cls_u32_ops);
+}
+
+static void __exit exit_u32(void)
+{
+	unregister_tcf_proto_ops(&cls_u32_ops);
+}
+
+module_init(init_u32)
+module_exit(exit_u32)
+MODULE_LICENSE("GPL");