cls_u32.c revision add93b610a4e66d36d0cf0b2596c3d3bcfdaee39 
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
33#include <linux/module.h>
34#include <linux/types.h>
35#include <linux/kernel.h>
36#include <linux/string.h>
37#include <linux/errno.h>
38#include <linux/rtnetlink.h>
39#include <linux/skbuff.h>
40#include <net/netlink.h>
41#include <net/act_api.h>
42#include <net/pkt_cls.h>
43
44struct 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
65struct 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
76struct 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
85static struct tcf_ext_map u32_ext_map = {
86	.action = TCA_U32_ACT,
87	.police = TCA_U32_POLICE
88};
89
90static struct tc_u_common *u32_list;
91
92static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel, u8 fshift)
93{
94	unsigned h = ntohl(key & sel->hmask)>>fshift;
95
96	return h;
97}
98
99static 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;
107	u8 *ptr = skb_network_header(skb);
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
117next_ht:
118	n = ht->ht[sel];
119
120next_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
130		if ((skb->mark & n->mark.mask) != n->mark.val) {
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
140			if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
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) {
150check_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)
185			sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel,n->fshift);
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)
193				off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
194			off2 &= ~3;
195		}
196		if (n->sel.flags&TC_U32_EAT) {
197			ptr += off2;
198			off2 = 0;
199		}
200
201		if (ptr < skb_tail_pointer(skb))
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
214deadloop:
215	if (net_ratelimit())
216		printk("cls_u32: dead loop\n");
217	return -1;
218}
219
220static __inline__ struct tc_u_hnode *
221u32_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
232static __inline__ struct tc_u_knode *
233u32_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;
245out:
246	return n;
247}
248
249
250static 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
269static void u32_put(struct tcf_proto *tp, unsigned long f)
270{
271}
272
273static 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
285static 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
294	root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
295	if (root_ht == NULL)
296		return -ENOBUFS;
297
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) {
304		tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
305		if (tp_c == NULL) {
306			kfree(root_ht);
307			return -ENOBUFS;
308		}
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
324static 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
331	kfree(n->pf);
332#endif
333	kfree(n);
334	return 0;
335}
336
337static 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
358static 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
372static 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
393static 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
414		for (ht=tp_c->hlist; ht; ht = ht->next)
415			u32_clear_hnode(tp, ht);
416
417		while ((ht = tp_c->hlist) != NULL) {
418			tp_c->hlist = ht->next;
419
420			BUG_TRAP(ht->refcnt == 0);
421
422			kfree(ht);
423		}
424
425		kfree(tp_c);
426	}
427
428	tp->data = NULL;
429}
430
431static int u32_delete(struct tcf_proto *tp, unsigned long arg)
432{
433	struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
434
435	if (ht == NULL)
436		return 0;
437
438	if (TC_U32_KEY(ht->handle))
439		return u32_delete_key(tp, (struct tc_u_knode*)ht);
440
441	if (tp->root == ht)
442		return -EINVAL;
443
444	if (--ht->refcnt == 0)
445		u32_destroy_hnode(tp, ht);
446
447	return 0;
448}
449
450static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
451{
452	struct tc_u_knode *n;
453	unsigned i = 0x7FF;
454
455	for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
456		if (i < TC_U32_NODE(n->handle))
457			i = TC_U32_NODE(n->handle);
458	i++;
459
460	return handle|(i>0xFFF ? 0xFFF : i);
461}
462
463static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
464			 struct tc_u_hnode *ht,
465			 struct tc_u_knode *n, struct nlattr **tb,
466			 struct nlattr *est)
467{
468	int err;
469	struct tcf_exts e;
470
471	err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
472	if (err < 0)
473		return err;
474
475	err = -EINVAL;
476	if (tb[TCA_U32_LINK]) {
477		u32 handle = *(u32*)nla_data(tb[TCA_U32_LINK]);
478		struct tc_u_hnode *ht_down = NULL;
479
480		if (TC_U32_KEY(handle))
481			goto errout;
482
483		if (handle) {
484			ht_down = u32_lookup_ht(ht->tp_c, handle);
485
486			if (ht_down == NULL)
487				goto errout;
488			ht_down->refcnt++;
489		}
490
491		tcf_tree_lock(tp);
492		ht_down = xchg(&n->ht_down, ht_down);
493		tcf_tree_unlock(tp);
494
495		if (ht_down)
496			ht_down->refcnt--;
497	}
498	if (tb[TCA_U32_CLASSID]) {
499		n->res.classid = *(u32*)nla_data(tb[TCA_U32_CLASSID]);
500		tcf_bind_filter(tp, &n->res, base);
501	}
502
503#ifdef CONFIG_NET_CLS_IND
504	if (tb[TCA_U32_INDEV]) {
505		err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
506		if (err < 0)
507			goto errout;
508	}
509#endif
510	tcf_exts_change(tp, &n->exts, &e);
511
512	return 0;
513errout:
514	tcf_exts_destroy(tp, &e);
515	return err;
516}
517
518static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
519		      struct nlattr **tca,
520		      unsigned long *arg)
521{
522	struct tc_u_common *tp_c = tp->data;
523	struct tc_u_hnode *ht;
524	struct tc_u_knode *n;
525	struct tc_u32_sel *s;
526	struct nlattr *opt = tca[TCA_OPTIONS];
527	struct nlattr *tb[TCA_U32_MAX + 1];
528	u32 htid;
529	int err;
530
531	if (opt == NULL)
532		return handle ? -EINVAL : 0;
533
534	if (nla_parse_nested(tb, TCA_U32_MAX, opt, NULL) < 0)
535		return -EINVAL;
536
537	if ((n = (struct tc_u_knode*)*arg) != NULL) {
538		if (TC_U32_KEY(n->handle) == 0)
539			return -EINVAL;
540
541		return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE]);
542	}
543
544	if (tb[TCA_U32_DIVISOR]) {
545		unsigned divisor = *(unsigned*)nla_data(tb[TCA_U32_DIVISOR]);
546
547		if (--divisor > 0x100)
548			return -EINVAL;
549		if (TC_U32_KEY(handle))
550			return -EINVAL;
551		if (handle == 0) {
552			handle = gen_new_htid(tp->data);
553			if (handle == 0)
554				return -ENOMEM;
555		}
556		ht = kzalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
557		if (ht == NULL)
558			return -ENOBUFS;
559		ht->tp_c = tp_c;
560		ht->refcnt = 0;
561		ht->divisor = divisor;
562		ht->handle = handle;
563		ht->prio = tp->prio;
564		ht->next = tp_c->hlist;
565		tp_c->hlist = ht;
566		*arg = (unsigned long)ht;
567		return 0;
568	}
569
570	if (tb[TCA_U32_HASH]) {
571		htid = *(unsigned*)nla_data(tb[TCA_U32_HASH]);
572		if (TC_U32_HTID(htid) == TC_U32_ROOT) {
573			ht = tp->root;
574			htid = ht->handle;
575		} else {
576			ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
577			if (ht == NULL)
578				return -EINVAL;
579		}
580	} else {
581		ht = tp->root;
582		htid = ht->handle;
583	}
584
585	if (ht->divisor < TC_U32_HASH(htid))
586		return -EINVAL;
587
588	if (handle) {
589		if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
590			return -EINVAL;
591		handle = htid | TC_U32_NODE(handle);
592	} else
593		handle = gen_new_kid(ht, htid);
594
595	if (tb[TCA_U32_SEL] == NULL ||
596	    nla_len(tb[TCA_U32_SEL]) < sizeof(struct tc_u32_sel))
597		return -EINVAL;
598
599	s = nla_data(tb[TCA_U32_SEL]);
600
601	n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
602	if (n == NULL)
603		return -ENOBUFS;
604
605#ifdef CONFIG_CLS_U32_PERF
606	n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
607	if (n->pf == NULL) {
608		kfree(n);
609		return -ENOBUFS;
610	}
611#endif
612
613	memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
614	n->ht_up = ht;
615	n->handle = handle;
616	n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
617
618#ifdef CONFIG_CLS_U32_MARK
619	if (tb[TCA_U32_MARK]) {
620		struct tc_u32_mark *mark;
621
622		if (nla_len(tb[TCA_U32_MARK]) < sizeof(struct tc_u32_mark)) {
623#ifdef CONFIG_CLS_U32_PERF
624			kfree(n->pf);
625#endif
626			kfree(n);
627			return -EINVAL;
628		}
629		mark = nla_data(tb[TCA_U32_MARK]);
630		memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
631		n->mark.success = 0;
632	}
633#endif
634
635	err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE]);
636	if (err == 0) {
637		struct tc_u_knode **ins;
638		for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
639			if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
640				break;
641
642		n->next = *ins;
643		wmb();
644		*ins = n;
645
646		*arg = (unsigned long)n;
647		return 0;
648	}
649#ifdef CONFIG_CLS_U32_PERF
650	kfree(n->pf);
651#endif
652	kfree(n);
653	return err;
654}
655
656static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
657{
658	struct tc_u_common *tp_c = tp->data;
659	struct tc_u_hnode *ht;
660	struct tc_u_knode *n;
661	unsigned h;
662
663	if (arg->stop)
664		return;
665
666	for (ht = tp_c->hlist; ht; ht = ht->next) {
667		if (ht->prio != tp->prio)
668			continue;
669		if (arg->count >= arg->skip) {
670			if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
671				arg->stop = 1;
672				return;
673			}
674		}
675		arg->count++;
676		for (h = 0; h <= ht->divisor; h++) {
677			for (n = ht->ht[h]; n; n = n->next) {
678				if (arg->count < arg->skip) {
679					arg->count++;
680					continue;
681				}
682				if (arg->fn(tp, (unsigned long)n, arg) < 0) {
683					arg->stop = 1;
684					return;
685				}
686				arg->count++;
687			}
688		}
689	}
690}
691
692static int u32_dump(struct tcf_proto *tp, unsigned long fh,
693		     struct sk_buff *skb, struct tcmsg *t)
694{
695	struct tc_u_knode *n = (struct tc_u_knode*)fh;
696	unsigned char *b = skb_tail_pointer(skb);
697	struct nlattr *nla;
698
699	if (n == NULL)
700		return skb->len;
701
702	t->tcm_handle = n->handle;
703
704	nla = (struct nlattr*)b;
705	NLA_PUT(skb, TCA_OPTIONS, 0, NULL);
706
707	if (TC_U32_KEY(n->handle) == 0) {
708		struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
709		u32 divisor = ht->divisor+1;
710		NLA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor);
711	} else {
712		NLA_PUT(skb, TCA_U32_SEL,
713			sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
714			&n->sel);
715		if (n->ht_up) {
716			u32 htid = n->handle & 0xFFFFF000;
717			NLA_PUT(skb, TCA_U32_HASH, 4, &htid);
718		}
719		if (n->res.classid)
720			NLA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid);
721		if (n->ht_down)
722			NLA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle);
723
724#ifdef CONFIG_CLS_U32_MARK
725		if (n->mark.val || n->mark.mask)
726			NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
727#endif
728
729		if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
730			goto nla_put_failure;
731
732#ifdef CONFIG_NET_CLS_IND
733		if(strlen(n->indev))
734			NLA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev);
735#endif
736#ifdef CONFIG_CLS_U32_PERF
737		NLA_PUT(skb, TCA_U32_PCNT,
738		sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
739			n->pf);
740#endif
741	}
742
743	nla->nla_len = skb_tail_pointer(skb) - b;
744	if (TC_U32_KEY(n->handle))
745		if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
746			goto nla_put_failure;
747	return skb->len;
748
749nla_put_failure:
750	nlmsg_trim(skb, b);
751	return -1;
752}
753
754static struct tcf_proto_ops cls_u32_ops __read_mostly = {
755	.kind		=	"u32",
756	.classify	=	u32_classify,
757	.init		=	u32_init,
758	.destroy	=	u32_destroy,
759	.get		=	u32_get,
760	.put		=	u32_put,
761	.change		=	u32_change,
762	.delete		=	u32_delete,
763	.walk		=	u32_walk,
764	.dump		=	u32_dump,
765	.owner		=	THIS_MODULE,
766};
767
768static int __init init_u32(void)
769{
770	printk("u32 classifier\n");
771#ifdef CONFIG_CLS_U32_PERF
772	printk("    Performance counters on\n");
773#endif
774#ifdef CONFIG_NET_CLS_IND
775	printk("    input device check on \n");
776#endif
777#ifdef CONFIG_NET_CLS_ACT
778	printk("    Actions configured \n");
779#endif
780	return register_tcf_proto_ops(&cls_u32_ops);
781}
782
783static void __exit exit_u32(void)
784{
785	unregister_tcf_proto_ops(&cls_u32_ops);
786}
787
788module_init(init_u32)
789module_exit(exit_u32)
790MODULE_LICENSE("GPL");
791