[mirror_ubuntu-bionic-kernel.git] / net / sched / cls_u32.c

/*
 * 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/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <net/netlink.h>
#include <net/act_api.h>
#include <net/pkt_cls.h>

struct tc_u_knode
{
	struct tc_u_knode	*next;
	u32			handle;
	struct tc_u_hnode	*ht_up;
	struct tcf_exts		exts;
#ifdef CONFIG_NET_CLS_IND
	char                     indev[IFNAMSIZ];
#endif
	u8			fshift;
	struct tcf_result	res;
	struct tc_u_hnode	*ht_down;
#ifdef CONFIG_CLS_U32_PERF
	struct tc_u32_pcnt	*pf;
#endif
#ifdef CONFIG_CLS_U32_MARK
	struct tc_u32_mark	mark;
#endif
	struct tc_u32_sel	sel;
};

struct tc_u_hnode
{
	struct tc_u_hnode	*next;
	u32			handle;
	u32			prio;
	struct tc_u_common	*tp_c;
	int			refcnt;
	unsigned		divisor;
	struct tc_u_knode	*ht[1];
};

struct tc_u_common
{
	struct tc_u_common	*next;
	struct tc_u_hnode	*hlist;
	struct Qdisc		*q;
	int			refcnt;
	u32			hgenerator;
};

static const struct tcf_ext_map u32_ext_map = {
	.action = TCA_U32_ACT,
	.police = TCA_U32_POLICE
};

static struct tc_u_common *u32_list;

static __inline__ unsigned u32_hash_fold(__be32 key, struct tc_u32_sel *sel, u8 fshift)
{
	unsigned h = ntohl(key & sel->hmask)>>fshift;

	return h;
}

static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
{
	struct {
		struct tc_u_knode *knode;
		u8		  *ptr;
	} stack[TC_U32_MAXDEPTH];

	struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
	u8 *ptr = skb_network_header(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 = ht->ht[sel];

next_knode:
	if (n) {
		struct tc_u32_key *key = n->sel.keys;

#ifdef CONFIG_CLS_U32_PERF
		n->pf->rcnt +=1;
		j = 0;
#endif

#ifdef CONFIG_CLS_U32_MARK
		if ((skb->mark & n->mark.mask) != n->mark.val) {
			n = n->next;
			goto next_knode;
		} else {
			n->mark.success++;
		}
#endif

		for (i = n->sel.nkeys; i>0; i--, key++) {

			if ((*(__be32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
				n = n->next;
				goto next_knode;
			}
#ifdef CONFIG_CLS_U32_PERF
			n->pf->kcnts[j] +=1;
			j++;
#endif
		}
		if (n->ht_down == NULL) {
check_terminal:
			if (n->sel.flags&TC_U32_TERMINAL) {

				*res = n->res;
#ifdef CONFIG_NET_CLS_IND
				if (!tcf_match_indev(skb, n->indev)) {
					n = n->next;
					goto next_knode;
				}
#endif
#ifdef CONFIG_CLS_U32_PERF
				n->pf->rhit +=1;
#endif
				r = tcf_exts_exec(skb, &n->exts, res);
				if (r < 0) {
					n = n->next;
					goto next_knode;
				}

				return r;
			}
			n = n->next;
			goto next_knode;
		}

		/* PUSH */
		if (sdepth >= TC_U32_MAXDEPTH)
			goto deadloop;
		stack[sdepth].knode = n;
		stack[sdepth].ptr = ptr;
		sdepth++;

		ht = n->ht_down;
		sel = 0;
		if (ht->divisor)
			sel = ht->divisor&u32_hash_fold(*(__be32*)(ptr+n->sel.hoff), &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)
				off2 += ntohs(n->sel.offmask & *(__be16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
			off2 &= ~3;
		}
		if (n->sel.flags&TC_U32_EAT) {
			ptr += off2;
			off2 = 0;
		}

		if (ptr < skb_tail_pointer(skb))
			goto next_ht;
	}

	/* POP */
	if (sdepth--) {
		n = stack[sdepth].knode;
		ht = n->ht_up;
		ptr = stack[sdepth].ptr;
		goto check_terminal;
	}
	return -1;

deadloop:
	if (net_ratelimit())
		printk("cls_u32: dead loop\n");
	return -1;
}

static __inline__ struct tc_u_hnode *
u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
{
	struct tc_u_hnode *ht;

	for (ht = tp_c->hlist; ht; ht = ht->next)
		if (ht->handle == handle)
			break;

	return ht;
}

static __inline__ struct tc_u_knode *
u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
{
	unsigned sel;
	struct tc_u_knode *n = NULL;

	sel = TC_U32_HASH(handle);
	if (sel > ht->divisor)
		goto out;

	for (n = ht->ht[sel]; n; n = 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 = 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 void u32_put(struct tcf_proto *tp, unsigned long f)
{
}

static u32 gen_new_htid(struct tc_u_common *tp_c)
{
	int i = 0x800;

	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;

	for (tp_c = u32_list; tp_c; tp_c = tp_c->next)
		if (tp_c->q == tp->q)
			break;

	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_c->next = u32_list;
		u32_list = tp_c;
	}

	tp_c->refcnt++;
	root_ht->next = tp_c->hlist;
	tp_c->hlist = root_ht;
	root_ht->tp_c = tp_c;

	tp->root = root_ht;
	tp->data = tp_c;
	return 0;
}

static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
{
	tcf_unbind_filter(tp, &n->res);
	tcf_exts_destroy(tp, &n->exts);
	if (n->ht_down)
		n->ht_down->refcnt--;
#ifdef CONFIG_CLS_U32_PERF
	kfree(n->pf);
#endif
	kfree(n);
	return 0;
}

static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
{
	struct tc_u_knode **kp;
	struct tc_u_hnode *ht = key->ht_up;

	if (ht) {
		for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
			if (*kp == key) {
				tcf_tree_lock(tp);
				*kp = key->next;
				tcf_tree_unlock(tp);

				u32_destroy_key(tp, key);
				return 0;
			}
		}
	}
	BUG_TRAP(0);
	return 0;
}

static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
{
	struct tc_u_knode *n;
	unsigned h;

	for (h=0; h<=ht->divisor; h++) {
		while ((n = ht->ht[h]) != NULL) {
			ht->ht[h] = n->next;

			u32_destroy_key(tp, n);
		}
	}
}

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 **hn;

	BUG_TRAP(!ht->refcnt);

	u32_clear_hnode(tp, ht);

	for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
		if (*hn == ht) {
			*hn = ht->next;
			kfree(ht);
			return 0;
		}
	}

	BUG_TRAP(0);
	return -ENOENT;
}

static void u32_destroy(struct tcf_proto *tp)
{
	struct tc_u_common *tp_c = tp->data;
	struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);

	BUG_TRAP(root_ht != NULL);

	if (root_ht && --root_ht->refcnt == 0)
		u32_destroy_hnode(tp, root_ht);

	if (--tp_c->refcnt == 0) {
		struct tc_u_hnode *ht;
		struct tc_u_common **tp_cp;

		for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) {
			if (*tp_cp == tp_c) {
				*tp_cp = tp_c->next;
				break;
			}
		}

		for (ht = tp_c->hlist; ht; ht = ht->next) {
			ht->refcnt--;
			u32_clear_hnode(tp, ht);
		}

		while ((ht = tp_c->hlist) != NULL) {
			tp_c->hlist = ht->next;

			BUG_TRAP(ht->refcnt == 0);

			kfree(ht);
		}

		kfree(tp_c);
	}

	tp->data = NULL;
}

static int u32_delete(struct tcf_proto *tp, unsigned long arg)
{
	struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;

	if (ht == NULL)
		return 0;

	if (TC_U32_KEY(ht->handle))
		return u32_delete_key(tp, (struct tc_u_knode*)ht);

	if (tp->root == ht)
		return -EINVAL;

	if (ht->refcnt == 1) {
		ht->refcnt--;
		u32_destroy_hnode(tp, ht);
	} else {
		return -EBUSY;
	}

	return 0;
}

static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
{
	struct tc_u_knode *n;
	unsigned i = 0x7FF;

	for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
		if (i < TC_U32_NODE(n->handle))
			i = TC_U32_NODE(n->handle);
	i++;

	return handle|(i>0xFFF ? 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 tcf_proto *tp, unsigned long base,
			 struct tc_u_hnode *ht,
			 struct tc_u_knode *n, struct nlattr **tb,
			 struct nlattr *est)
{
	int err;
	struct tcf_exts e;

	err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
	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;

		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++;
		}

		tcf_tree_lock(tp);
		ht_down = xchg(&n->ht_down, ht_down);
		tcf_tree_unlock(tp);

		if (ht_down)
			ht_down->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]) {
		err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
		if (err < 0)
			goto errout;
	}
#endif
	tcf_exts_change(tp, &n->exts, &e);

	return 0;
errout:
	tcf_exts_destroy(tp, &e);
	return err;
}

static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
		      struct nlattr **tca,
		      unsigned long *arg)
{
	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;

	if (opt == NULL)
		return handle ? -EINVAL : 0;

	err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
	if (err < 0)
		return err;

	if ((n = (struct tc_u_knode*)*arg) != NULL) {
		if (TC_U32_KEY(n->handle) == 0)
			return -EINVAL;

		return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE]);
	}

	if (tb[TCA_U32_DIVISOR]) {
		unsigned 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;
		ht->next = tp_c->hlist;
		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 = tp->root;
			htid = ht->handle;
		} else {
			ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
			if (ht == NULL)
				return -EINVAL;
		}
	} else {
		ht = 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
	n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
	if (n->pf == NULL) {
		kfree(n);
		return -ENOBUFS;
	}
#endif

	memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
	n->ht_up = ht;
	n->handle = handle;
	n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;

#ifdef CONFIG_CLS_U32_MARK
	if (tb[TCA_U32_MARK]) {
		struct tc_u32_mark *mark;

		mark = nla_data(tb[TCA_U32_MARK]);
		memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
		n->mark.success = 0;
	}
#endif

	err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE]);
	if (err == 0) {
		struct tc_u_knode **ins;
		for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
			if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
				break;

		n->next = *ins;
		wmb();
		*ins = n;

		*arg = (unsigned long)n;
		return 0;
	}
#ifdef CONFIG_CLS_U32_PERF
	kfree(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 h;

	if (arg->stop)
		return;

	for (ht = tp_c->hlist; ht; ht = 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 = ht->ht[h]; n; n = 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 tcf_proto *tp, unsigned long fh,
		     struct sk_buff *skb, struct tcmsg *t)
{
	struct tc_u_knode *n = (struct tc_u_knode*)fh;
	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;
		NLA_PUT_U32(skb, TCA_U32_DIVISOR, divisor);
	} else {
		NLA_PUT(skb, TCA_U32_SEL,
			sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
			&n->sel);
		if (n->ht_up) {
			u32 htid = n->handle & 0xFFFFF000;
			NLA_PUT_U32(skb, TCA_U32_HASH, htid);
		}
		if (n->res.classid)
			NLA_PUT_U32(skb, TCA_U32_CLASSID, n->res.classid);
		if (n->ht_down)
			NLA_PUT_U32(skb, TCA_U32_LINK, n->ht_down->handle);

#ifdef CONFIG_CLS_U32_MARK
		if (n->mark.val || n->mark.mask)
			NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
#endif

		if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
			goto nla_put_failure;

#ifdef CONFIG_NET_CLS_IND
		if(strlen(n->indev))
			NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev);
#endif
#ifdef CONFIG_CLS_U32_PERF
		NLA_PUT(skb, TCA_U32_PCNT,
		sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
			n->pf);
#endif
	}

	nla_nest_end(skb, nest);

	if (TC_U32_KEY(n->handle))
		if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 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,
	.put		=	u32_put,
	.change		=	u32_change,
	.delete		=	u32_delete,
	.walk		=	u32_walk,
	.dump		=	u32_dump,
	.owner		=	THIS_MODULE,
};

static int __init init_u32(void)
{
	printk("u32 classifier\n");
#ifdef CONFIG_CLS_U32_PERF
	printk("    Performance counters on\n");
#endif
#ifdef CONFIG_NET_CLS_IND
	printk("    input device check on \n");
#endif
#ifdef CONFIG_NET_CLS_ACT
	printk("    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");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* net/sched/cls_u32.c Ugly (or Universal) 32bit key Packet Classifier.
	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	*
	11	* The filters are packed to hash tables of key nodes
	12	* with a set of 32bit key/mask pairs at every node.
	13	* Nodes reference next level hash tables etc.
	14	*
	15	* This scheme is the best universal classifier I managed to
	16	* invent; it is not super-fast, but it is not slow (provided you
	17	* program it correctly), and general enough. And its relative
	18	* speed grows as the number of rules becomes larger.
	19	*
	20	* It seems that it represents the best middle point between
	21	* speed and manageability both by human and by machine.
	22	*
	23	* It is especially useful for link sharing combined with QoS;
	24	* pure RSVP doesn't need such a general approach and can use
	25	* much simpler (and faster) schemes, sort of cls_rsvp.c.
	26	*
	27	* JHS: We should remove the CONFIG_NET_CLS_IND from here
	28	* eventually when the meta match extension is made available
	29	*
	30	* nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
	31	*/
	32
1da177e4 LT	33	#include <linux/module.h>
	34	#include <linux/types.h>
	35	#include <linux/kernel.h>
1da177e4	36	#include <linux/string.h>
1da177e4	37	#include <linux/errno.h>
1da177e4	38	#include <linux/rtnetlink.h>
1da177e4	39	#include <linux/skbuff.h>
0ba48053	40	#include <net/netlink.h>
1da177e4 LT	41	#include <net/act_api.h>
	42	#include <net/pkt_cls.h>
	43
	44	struct tc_u_knode
	45	{
	46	struct tc_u_knode *next;
	47	u32 handle;
	48	struct tc_u_hnode *ht_up;
	49	struct tcf_exts exts;
	50	#ifdef CONFIG_NET_CLS_IND
	51	char indev[IFNAMSIZ];
	52	#endif
	53	u8 fshift;
	54	struct tcf_result res;
	55	struct tc_u_hnode *ht_down;
	56	#ifdef CONFIG_CLS_U32_PERF
	57	struct tc_u32_pcnt *pf;
	58	#endif
	59	#ifdef CONFIG_CLS_U32_MARK
	60	struct tc_u32_mark mark;
	61	#endif
	62	struct tc_u32_sel sel;
	63	};
	64
	65	struct tc_u_hnode
	66	{
	67	struct tc_u_hnode *next;
	68	u32 handle;
	69	u32 prio;
	70	struct tc_u_common *tp_c;
	71	int refcnt;
	72	unsigned divisor;
	73	struct tc_u_knode *ht[1];
	74	};
	75
	76	struct tc_u_common
	77	{
	78	struct tc_u_common *next;
	79	struct tc_u_hnode *hlist;
	80	struct Qdisc *q;
	81	int refcnt;
	82	u32 hgenerator;
	83	};
	84
5239008b	85	static const struct tcf_ext_map u32_ext_map = {
1da177e4 LT	86	.action = TCA_U32_ACT,
	87	.police = TCA_U32_POLICE
	88	};
	89
	90	static struct tc_u_common *u32_list;
	91
0382b9c3	92	static __inline__ unsigned u32_hash_fold(__be32 key, struct tc_u32_sel *sel, u8 fshift)
1da177e4	93	{
543821c6	94	unsigned h = ntohl(key & sel->hmask)>>fshift;
1da177e4 LT	95
	96	return h;
	97	}
	98
	99	static int u32_classify(struct sk_buff skb, struct tcf_proto tp, struct tcf_result *res)
	100	{
	101	struct {
	102	struct tc_u_knode *knode;
	103	u8 *ptr;
	104	} stack[TC_U32_MAXDEPTH];
	105
	106	struct tc_u_hnode ht = (struct tc_u_hnode)tp->root;
d56f90a7	107	u8 *ptr = skb_network_header(skb);
1da177e4 LT	108	struct tc_u_knode *n;
	109	int sdepth = 0;
	110	int off2 = 0;
	111	int sel = 0;
	112	#ifdef CONFIG_CLS_U32_PERF
	113	int j;
	114	#endif
	115	int i, r;
	116
	117	next_ht:
	118	n = ht->ht[sel];
	119
	120	next_knode:
	121	if (n) {
	122	struct tc_u32_key *key = n->sel.keys;
	123
	124	#ifdef CONFIG_CLS_U32_PERF
	125	n->pf->rcnt +=1;
	126	j = 0;
	127	#endif
	128
	129	#ifdef CONFIG_CLS_U32_MARK
82e91ffe	130	if ((skb->mark & n->mark.mask) != n->mark.val) {
1da177e4 LT	131	n = n->next;
	132	goto next_knode;
	133	} else {
	134	n->mark.success++;
	135	}
	136	#endif
	137
	138	for (i = n->sel.nkeys; i>0; i--, key++) {
	139
0382b9c3	140	if (((__be32)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
1da177e4 LT	141	n = n->next;
	142	goto next_knode;
	143	}
	144	#ifdef CONFIG_CLS_U32_PERF
	145	n->pf->kcnts[j] +=1;
	146	j++;
	147	#endif
	148	}
	149	if (n->ht_down == NULL) {
	150	check_terminal:
	151	if (n->sel.flags&TC_U32_TERMINAL) {
	152
	153	*res = n->res;
	154	#ifdef CONFIG_NET_CLS_IND
	155	if (!tcf_match_indev(skb, n->indev)) {
	156	n = n->next;
	157	goto next_knode;
	158	}
	159	#endif
	160	#ifdef CONFIG_CLS_U32_PERF
	161	n->pf->rhit +=1;
	162	#endif
	163	r = tcf_exts_exec(skb, &n->exts, res);
	164	if (r < 0) {
	165	n = n->next;
	166	goto next_knode;
	167	}
	168
	169	return r;
	170	}
	171	n = n->next;
	172	goto next_knode;
	173	}
	174
	175	/* PUSH */
	176	if (sdepth >= TC_U32_MAXDEPTH)
	177	goto deadloop;
	178	stack[sdepth].knode = n;
	179	stack[sdepth].ptr = ptr;
	180	sdepth++;
	181
	182	ht = n->ht_down;
	183	sel = 0;
	184	if (ht->divisor)
0382b9c3	185	sel = ht->divisor&u32_hash_fold((__be32)(ptr+n->sel.hoff), &n->sel,n->fshift);
1da177e4 LT	186
	187	if (!(n->sel.flags&(TC_U32_VAROFFSET\|TC_U32_OFFSET\|TC_U32_EAT)))
	188	goto next_ht;
	189
	190	if (n->sel.flags&(TC_U32_OFFSET\|TC_U32_VAROFFSET)) {
	191	off2 = n->sel.off + 3;
	192	if (n->sel.flags&TC_U32_VAROFFSET)
0382b9c3	193	off2 += ntohs(n->sel.offmask & (__be16)(ptr+n->sel.offoff)) >>n->sel.offshift;
1da177e4 LT	194	off2 &= ~3;
	195	}
	196	if (n->sel.flags&TC_U32_EAT) {
	197	ptr += off2;
	198	off2 = 0;
	199	}
	200
27a884dc	201	if (ptr < skb_tail_pointer(skb))
1da177e4 LT	202	goto next_ht;
	203	}
	204
	205	/* POP */
	206	if (sdepth--) {
	207	n = stack[sdepth].knode;
	208	ht = n->ht_up;
	209	ptr = stack[sdepth].ptr;
	210	goto check_terminal;
	211	}
	212	return -1;
	213
	214	deadloop:
	215	if (net_ratelimit())
	216	printk("cls_u32: dead loop\n");
	217	return -1;
	218	}
	219
	220	static __inline__ struct tc_u_hnode *
	221	u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
	222	{
	223	struct tc_u_hnode *ht;
	224
	225	for (ht = tp_c->hlist; ht; ht = ht->next)
	226	if (ht->handle == handle)
	227	break;
	228
	229	return ht;
	230	}
	231
	232	static __inline__ struct tc_u_knode *
	233	u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
	234	{
	235	unsigned sel;
	236	struct tc_u_knode *n = NULL;
	237
	238	sel = TC_U32_HASH(handle);
	239	if (sel > ht->divisor)
	240	goto out;
	241
	242	for (n = ht->ht[sel]; n; n = n->next)
	243	if (n->handle == handle)
	244	break;
	245	out:
	246	return n;
	247	}
	248
	249
	250	static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
	251	{
	252	struct tc_u_hnode *ht;
	253	struct tc_u_common *tp_c = tp->data;
	254
	255	if (TC_U32_HTID(handle) == TC_U32_ROOT)
	256	ht = tp->root;
	257	else
	258	ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
	259
	260	if (!ht)
	261	return 0;
	262
	263	if (TC_U32_KEY(handle) == 0)
	264	return (unsigned long)ht;
	265
266	return (unsigned long)u32_lookup_key(ht, handle);
267	}
268
269	static void u32_put(struct tcf_proto *tp, unsigned long f)
270	{
271	}
272
273	static u32 gen_new_htid(struct tc_u_common *tp_c)
274	{
275	int i = 0x800;
276
277	do {
278	if (++tp_c->hgenerator == 0x7FF)
279	tp_c->hgenerator = 1;
280	} while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator\|0x800)<<20));
281
282	return i > 0 ? (tp_c->hgenerator\|0x800)<<20 : 0;
283	}
284
285	static int u32_init(struct tcf_proto *tp)
286	{
287	struct tc_u_hnode *root_ht;
288	struct tc_u_common *tp_c;
289
290	for (tp_c = u32_list; tp_c; tp_c = tp_c->next)
291	if (tp_c->q == tp->q)
292	break;
293
0da974f4	294	root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
1da177e4 LT	295	if (root_ht == NULL)
	296	return -ENOBUFS;
	297
1da177e4 LT	298	root_ht->divisor = 0;
	299	root_ht->refcnt++;
	300	root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
	301	root_ht->prio = tp->prio;
	302
	303	if (tp_c == NULL) {
0da974f4	304	tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
1da177e4 LT	305	if (tp_c == NULL) {
	306	kfree(root_ht);
	307	return -ENOBUFS;
	308	}
1da177e4 LT	309	tp_c->q = tp->q;
	310	tp_c->next = u32_list;
	311	u32_list = tp_c;
	312	}
	313
	314	tp_c->refcnt++;
	315	root_ht->next = tp_c->hlist;
	316	tp_c->hlist = root_ht;
	317	root_ht->tp_c = tp_c;
	318
	319	tp->root = root_ht;
	320	tp->data = tp_c;
	321	return 0;
	322	}
	323
	324	static int u32_destroy_key(struct tcf_proto tp, struct tc_u_knode n)
	325	{
	326	tcf_unbind_filter(tp, &n->res);
	327	tcf_exts_destroy(tp, &n->exts);
	328	if (n->ht_down)
	329	n->ht_down->refcnt--;
	330	#ifdef CONFIG_CLS_U32_PERF
1ae39a43	331	kfree(n->pf);
1da177e4 LT	332	#endif
	333	kfree(n);
	334	return 0;
	335	}
	336
	337	static int u32_delete_key(struct tcf_proto tp, struct tc_u_knode key)
	338	{
	339	struct tc_u_knode **kp;
	340	struct tc_u_hnode *ht = key->ht_up;
	341
	342	if (ht) {
	343	for (kp = &ht->ht[TC_U32_HASH(key->handle)]; kp; kp = &(kp)->next) {
	344	if (*kp == key) {
	345	tcf_tree_lock(tp);
	346	*kp = key->next;
	347	tcf_tree_unlock(tp);
	348
	349	u32_destroy_key(tp, key);
	350	return 0;
	351	}
	352	}
	353	}
	354	BUG_TRAP(0);
	355	return 0;
	356	}
	357
	358	static void u32_clear_hnode(struct tcf_proto tp, struct tc_u_hnode ht)
	359	{
	360	struct tc_u_knode *n;
	361	unsigned h;
	362
	363	for (h=0; h<=ht->divisor; h++) {
	364	while ((n = ht->ht[h]) != NULL) {
	365	ht->ht[h] = n->next;
	366
	367	u32_destroy_key(tp, n);
	368	}
	369	}
	370	}
	371
	372	static int u32_destroy_hnode(struct tcf_proto tp, struct tc_u_hnode ht)
	373	{
	374	struct tc_u_common *tp_c = tp->data;
	375	struct tc_u_hnode **hn;
	376
	377	BUG_TRAP(!ht->refcnt);
	378
	379	u32_clear_hnode(tp, ht);
	380
	381	for (hn = &tp_c->hlist; hn; hn = &(hn)->next) {
	382	if (*hn == ht) {
	383	*hn = ht->next;
	384	kfree(ht);
	385	return 0;
	386	}
	387	}
	388
	389	BUG_TRAP(0);
	390	return -ENOENT;
	391	}
	392
	393	static void u32_destroy(struct tcf_proto *tp)
	394	{
	395	struct tc_u_common *tp_c = tp->data;
396	struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);
397
398	BUG_TRAP(root_ht != NULL);
399
400	if (root_ht && --root_ht->refcnt == 0)
401	u32_destroy_hnode(tp, root_ht);
402
403	if (--tp_c->refcnt == 0) {
404	struct tc_u_hnode *ht;
405	struct tc_u_common **tp_cp;
406
407	for (tp_cp = &u32_list; tp_cp; tp_cp = &(tp_cp)->next) {
408	if (*tp_cp == tp_c) {
409	*tp_cp = tp_c->next;
410	break;
411	}
412	}
413
e56cfad1 JP	414	for (ht = tp_c->hlist; ht; ht = ht->next) {
e56cfad1 JP	415	ht->refcnt--;
1da177e4	416	u32_clear_hnode(tp, ht);
e56cfad1	417	}
1da177e4 LT	418
	419	while ((ht = tp_c->hlist) != NULL) {
	420	tp_c->hlist = ht->next;
	421
	422	BUG_TRAP(ht->refcnt == 0);
	423
	424	kfree(ht);
3ff50b79	425	}
1da177e4 LT	426
	427	kfree(tp_c);
	428	}
	429
	430	tp->data = NULL;
	431	}
	432
	433	static int u32_delete(struct tcf_proto *tp, unsigned long arg)
	434	{
	435	struct tc_u_hnode ht = (struct tc_u_hnode)arg;
	436
	437	if (ht == NULL)
	438	return 0;
	439
	440	if (TC_U32_KEY(ht->handle))
	441	return u32_delete_key(tp, (struct tc_u_knode*)ht);
	442
	443	if (tp->root == ht)
	444	return -EINVAL;
	445
e56cfad1 JP	446	if (ht->refcnt == 1) {
e56cfad1 JP	447	ht->refcnt--;
1da177e4	448	u32_destroy_hnode(tp, ht);
e56cfad1 JP	449	} else {
	450	return -EBUSY;
	451	}
1da177e4 LT	452
	453	return 0;
	454	}
	455
	456	static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
	457	{
	458	struct tc_u_knode *n;
	459	unsigned i = 0x7FF;
	460
	461	for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
	462	if (i < TC_U32_NODE(n->handle))
	463	i = TC_U32_NODE(n->handle);
	464	i++;
	465
	466	return handle\|(i>0xFFF ? 0xFFF : i);
	467	}
	468
6fa8c014 PM	469	static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
	470	[TCA_U32_CLASSID] = { .type = NLA_U32 },
	471	[TCA_U32_HASH] = { .type = NLA_U32 },
	472	[TCA_U32_LINK] = { .type = NLA_U32 },
	473	[TCA_U32_DIVISOR] = { .type = NLA_U32 },
	474	[TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
	475	[TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
	476	[TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
	477	};
	478
1da177e4 LT	479	static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
1da177e4 LT	480	struct tc_u_hnode *ht,
add93b61 PM	481	struct tc_u_knode n, struct nlattr *tb,
add93b61 PM	482	struct nlattr *est)
1da177e4 LT	483	{
	484	int err;
	485	struct tcf_exts e;
	486
	487	err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
	488	if (err < 0)
	489	return err;
	490
	491	err = -EINVAL;
add93b61	492	if (tb[TCA_U32_LINK]) {
1587bac4	493	u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
1da177e4 LT	494	struct tc_u_hnode *ht_down = NULL;
	495
	496	if (TC_U32_KEY(handle))
	497	goto errout;
	498
	499	if (handle) {
	500	ht_down = u32_lookup_ht(ht->tp_c, handle);
	501
	502	if (ht_down == NULL)
	503	goto errout;
	504	ht_down->refcnt++;
	505	}
	506
	507	tcf_tree_lock(tp);
	508	ht_down = xchg(&n->ht_down, ht_down);
	509	tcf_tree_unlock(tp);
	510
	511	if (ht_down)
	512	ht_down->refcnt--;
	513	}
add93b61	514	if (tb[TCA_U32_CLASSID]) {
1587bac4	515	n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
1da177e4 LT	516	tcf_bind_filter(tp, &n->res, base);
	517	}
	518
	519	#ifdef CONFIG_NET_CLS_IND
add93b61 PM	520	if (tb[TCA_U32_INDEV]) {
add93b61 PM	521	err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
1da177e4 LT	522	if (err < 0)
	523	goto errout;
	524	}
	525	#endif
	526	tcf_exts_change(tp, &n->exts, &e);
	527
	528	return 0;
	529	errout:
	530	tcf_exts_destroy(tp, &e);
	531	return err;
	532	}
	533
	534	static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
add93b61	535	struct nlattr **tca,
1da177e4 LT	536	unsigned long *arg)
	537	{
	538	struct tc_u_common *tp_c = tp->data;
	539	struct tc_u_hnode *ht;
	540	struct tc_u_knode *n;
	541	struct tc_u32_sel *s;
add93b61 PM	542	struct nlattr *opt = tca[TCA_OPTIONS];
add93b61 PM	543	struct nlattr *tb[TCA_U32_MAX + 1];
1da177e4 LT	544	u32 htid;
	545	int err;
	546
	547	if (opt == NULL)
	548	return handle ? -EINVAL : 0;
	549
6fa8c014	550	err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
cee63723 PM	551	if (err < 0)
cee63723 PM	552	return err;
1da177e4 LT	553
	554	if ((n = (struct tc_u_knode)arg) != NULL) {
	555	if (TC_U32_KEY(n->handle) == 0)
	556	return -EINVAL;
	557
add93b61	558	return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE]);
1da177e4 LT	559	}
1da177e4 LT	560
add93b61	561	if (tb[TCA_U32_DIVISOR]) {
1587bac4	562	unsigned divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
1da177e4 LT	563
	564	if (--divisor > 0x100)
	565	return -EINVAL;
	566	if (TC_U32_KEY(handle))
	567	return -EINVAL;
	568	if (handle == 0) {
	569	handle = gen_new_htid(tp->data);
	570	if (handle == 0)
	571	return -ENOMEM;
	572	}
0da974f4	573	ht = kzalloc(sizeof(ht) + divisorsizeof(void*), GFP_KERNEL);
1da177e4 LT	574	if (ht == NULL)
1da177e4 LT	575	return -ENOBUFS;
1da177e4	576	ht->tp_c = tp_c;
e56cfad1	577	ht->refcnt = 1;
1da177e4 LT	578	ht->divisor = divisor;
	579	ht->handle = handle;
	580	ht->prio = tp->prio;
	581	ht->next = tp_c->hlist;
	582	tp_c->hlist = ht;
	583	*arg = (unsigned long)ht;
	584	return 0;
	585	}
	586
add93b61	587	if (tb[TCA_U32_HASH]) {
1587bac4	588	htid = nla_get_u32(tb[TCA_U32_HASH]);
1da177e4 LT	589	if (TC_U32_HTID(htid) == TC_U32_ROOT) {
	590	ht = tp->root;
	591	htid = ht->handle;
	592	} else {
	593	ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
	594	if (ht == NULL)
	595	return -EINVAL;
	596	}
	597	} else {
	598	ht = tp->root;
	599	htid = ht->handle;
	600	}
	601
	602	if (ht->divisor < TC_U32_HASH(htid))
	603	return -EINVAL;
	604
	605	if (handle) {
	606	if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
	607	return -EINVAL;
	608	handle = htid \| TC_U32_NODE(handle);
	609	} else
	610	handle = gen_new_kid(ht, htid);
	611
6fa8c014	612	if (tb[TCA_U32_SEL] == NULL)
1da177e4 LT	613	return -EINVAL;
1da177e4 LT	614
add93b61	615	s = nla_data(tb[TCA_U32_SEL]);
1da177e4	616
0da974f4	617	n = kzalloc(sizeof(n) + s->nkeyssizeof(struct tc_u32_key), GFP_KERNEL);
1da177e4 LT	618	if (n == NULL)
	619	return -ENOBUFS;
	620
1da177e4	621	#ifdef CONFIG_CLS_U32_PERF
0da974f4	622	n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
1da177e4 LT	623	if (n->pf == NULL) {
	624	kfree(n);
	625	return -ENOBUFS;
	626	}
1da177e4 LT	627	#endif
	628
	629	memcpy(&n->sel, s, sizeof(s) + s->nkeyssizeof(struct tc_u32_key));
	630	n->ht_up = ht;
	631	n->handle = handle;
b2268016	632	n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1da177e4 LT	633
1da177e4 LT	634	#ifdef CONFIG_CLS_U32_MARK
add93b61	635	if (tb[TCA_U32_MARK]) {
1da177e4 LT	636	struct tc_u32_mark *mark;
1da177e4 LT	637
add93b61	638	mark = nla_data(tb[TCA_U32_MARK]);
1da177e4 LT	639	memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
	640	n->mark.success = 0;
	641	}
	642	#endif
	643
add93b61	644	err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE]);
1da177e4 LT	645	if (err == 0) {
	646	struct tc_u_knode **ins;
	647	for (ins = &ht->ht[TC_U32_HASH(handle)]; ins; ins = &(ins)->next)
	648	if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
	649	break;
	650
	651	n->next = *ins;
	652	wmb();
	653	*ins = n;
	654
	655	*arg = (unsigned long)n;
	656	return 0;
	657	}
	658	#ifdef CONFIG_CLS_U32_PERF
1ae39a43	659	kfree(n->pf);
1da177e4 LT	660	#endif
	661	kfree(n);
	662	return err;
	663	}
	664
	665	static void u32_walk(struct tcf_proto tp, struct tcf_walker arg)
	666	{
	667	struct tc_u_common *tp_c = tp->data;
	668	struct tc_u_hnode *ht;
	669	struct tc_u_knode *n;
	670	unsigned h;
	671
	672	if (arg->stop)
	673	return;
	674
	675	for (ht = tp_c->hlist; ht; ht = ht->next) {
	676	if (ht->prio != tp->prio)
	677	continue;
	678	if (arg->count >= arg->skip) {
	679	if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
	680	arg->stop = 1;
	681	return;
	682	}
	683	}
	684	arg->count++;
	685	for (h = 0; h <= ht->divisor; h++) {
	686	for (n = ht->ht[h]; n; n = n->next) {
	687	if (arg->count < arg->skip) {
	688	arg->count++;
	689	continue;
	690	}
	691	if (arg->fn(tp, (unsigned long)n, arg) < 0) {
	692	arg->stop = 1;
	693	return;
	694	}
	695	arg->count++;
	696	}
	697	}
	698	}
	699	}
	700
	701	static int u32_dump(struct tcf_proto *tp, unsigned long fh,
	702	struct sk_buff skb, struct tcmsg t)
	703	{
	704	struct tc_u_knode n = (struct tc_u_knode)fh;
4b3550ef	705	struct nlattr *nest;
1da177e4 LT	706
	707	if (n == NULL)
	708	return skb->len;
	709
	710	t->tcm_handle = n->handle;
	711
4b3550ef PM	712	nest = nla_nest_start(skb, TCA_OPTIONS);
	713	if (nest == NULL)
	714	goto nla_put_failure;
1da177e4 LT	715
	716	if (TC_U32_KEY(n->handle) == 0) {
	717	struct tc_u_hnode ht = (struct tc_u_hnode)fh;
	718	u32 divisor = ht->divisor+1;
24beeab5	719	NLA_PUT_U32(skb, TCA_U32_DIVISOR, divisor);
1da177e4	720	} else {
add93b61	721	NLA_PUT(skb, TCA_U32_SEL,
1da177e4 LT	722	sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
	723	&n->sel);
	724	if (n->ht_up) {
	725	u32 htid = n->handle & 0xFFFFF000;
24beeab5	726	NLA_PUT_U32(skb, TCA_U32_HASH, htid);
1da177e4 LT	727	}
1da177e4 LT	728	if (n->res.classid)
24beeab5	729	NLA_PUT_U32(skb, TCA_U32_CLASSID, n->res.classid);
1da177e4	730	if (n->ht_down)
24beeab5	731	NLA_PUT_U32(skb, TCA_U32_LINK, n->ht_down->handle);
1da177e4 LT	732
	733	#ifdef CONFIG_CLS_U32_MARK
	734	if (n->mark.val \|\| n->mark.mask)
add93b61	735	NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
1da177e4 LT	736	#endif
	737
	738	if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
add93b61	739	goto nla_put_failure;
1da177e4 LT	740
	741	#ifdef CONFIG_NET_CLS_IND
	742	if(strlen(n->indev))
57e1c487	743	NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev);
1da177e4 LT	744	#endif
1da177e4 LT	745	#ifdef CONFIG_CLS_U32_PERF
add93b61	746	NLA_PUT(skb, TCA_U32_PCNT,
1da177e4 LT	747	sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
	748	n->pf);
	749	#endif
	750	}
	751
4b3550ef PM	752	nla_nest_end(skb, nest);
4b3550ef PM	753
1da177e4 LT	754	if (TC_U32_KEY(n->handle))
1da177e4 LT	755	if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
add93b61	756	goto nla_put_failure;
1da177e4 LT	757	return skb->len;
1da177e4 LT	758
add93b61	759	nla_put_failure:
4b3550ef	760	nla_nest_cancel(skb, nest);
1da177e4 LT	761	return -1;
	762	}
	763
2eb9d75c	764	static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1da177e4 LT	765	.kind = "u32",
	766	.classify = u32_classify,
	767	.init = u32_init,
	768	.destroy = u32_destroy,
	769	.get = u32_get,
	770	.put = u32_put,
	771	.change = u32_change,
	772	.delete = u32_delete,
	773	.walk = u32_walk,
	774	.dump = u32_dump,
	775	.owner = THIS_MODULE,
	776	};
	777
	778	static int __init init_u32(void)
	779	{
	780	printk("u32 classifier\n");
	781	#ifdef CONFIG_CLS_U32_PERF
c0956bd2	782	printk(" Performance counters on\n");
1da177e4	783	#endif
1da177e4 LT	784	#ifdef CONFIG_NET_CLS_IND
	785	printk(" input device check on \n");
	786	#endif
	787	#ifdef CONFIG_NET_CLS_ACT
	788	printk(" Actions configured \n");
	789	#endif
	790	return register_tcf_proto_ops(&cls_u32_ops);
	791	}
	792
10297b99	793	static void __exit exit_u32(void)
1da177e4 LT	794	{
	795	unregister_tcf_proto_ops(&cls_u32_ops);
	796	}
	797
	798	module_init(init_u32)
	799	module_exit(exit_u32)
	800	MODULE_LICENSE("GPL");