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33#include <linux/module.h>
34#include <linux/slab.h>
35#include <linux/types.h>
36#include <linux/kernel.h>
37#include <linux/string.h>
38#include <linux/errno.h>
39#include <linux/rtnetlink.h>
40#include <linux/skbuff.h>
41#include <net/netlink.h>
42#include <net/act_api.h>
43#include <net/pkt_cls.h>
44
45struct tc_u_knode
46{
47 struct tc_u_knode *next;
48 u32 handle;
49 struct tc_u_hnode *ht_up;
50 struct tcf_exts exts;
51#ifdef CONFIG_NET_CLS_IND
52 char indev[IFNAMSIZ];
53#endif
54 u8 fshift;
55 struct tcf_result res;
56 struct tc_u_hnode *ht_down;
57#ifdef CONFIG_CLS_U32_PERF
58 struct tc_u32_pcnt *pf;
59#endif
60#ifdef CONFIG_CLS_U32_MARK
61 struct tc_u32_mark mark;
62#endif
63 struct tc_u32_sel sel;
64};
65
66struct tc_u_hnode
67{
68 struct tc_u_hnode *next;
69 u32 handle;
70 u32 prio;
71 struct tc_u_common *tp_c;
72 int refcnt;
73 unsigned divisor;
74 struct tc_u_knode *ht[1];
75};
76
77struct tc_u_common
78{
79 struct tc_u_hnode *hlist;
80 struct Qdisc *q;
81 int refcnt;
82 u32 hgenerator;
83};
84
85static const struct tcf_ext_map u32_ext_map = {
86 .action = TCA_U32_ACT,
87 .police = TCA_U32_POLICE
88};
89
90static __inline__ unsigned u32_hash_fold(__be32 key, struct tc_u32_sel *sel, u8 fshift)
91{
92 unsigned h = ntohl(key & sel->hmask)>>fshift;
93
94 return h;
95}
96
97static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
98{
99 struct {
100 struct tc_u_knode *knode;
101 unsigned int off;
102 } stack[TC_U32_MAXDEPTH];
103
104 struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
105 unsigned int off = skb_network_offset(skb);
106 struct tc_u_knode *n;
107 int sdepth = 0;
108 int off2 = 0;
109 int sel = 0;
110#ifdef CONFIG_CLS_U32_PERF
111 int j;
112#endif
113 int i, r;
114
115next_ht:
116 n = ht->ht[sel];
117
118next_knode:
119 if (n) {
120 struct tc_u32_key *key = n->sel.keys;
121
122#ifdef CONFIG_CLS_U32_PERF
123 n->pf->rcnt +=1;
124 j = 0;
125#endif
126
127#ifdef CONFIG_CLS_U32_MARK
128 if ((skb->mark & n->mark.mask) != n->mark.val) {
129 n = n->next;
130 goto next_knode;
131 } else {
132 n->mark.success++;
133 }
134#endif
135
136 for (i = n->sel.nkeys; i>0; i--, key++) {
137 int toff = off + key->off + (off2 & key->offmask);
138 __be32 *data, _data;
139
140 if (skb_headroom(skb) + toff > INT_MAX)
141 goto out;
142
143 data = skb_header_pointer(skb, toff, 4, &_data);
144 if (!data)
145 goto out;
146 if ((*data ^ key->val) & key->mask) {
147 n = n->next;
148 goto next_knode;
149 }
150#ifdef CONFIG_CLS_U32_PERF
151 n->pf->kcnts[j] +=1;
152 j++;
153#endif
154 }
155 if (n->ht_down == NULL) {
156check_terminal:
157 if (n->sel.flags&TC_U32_TERMINAL) {
158
159 *res = n->res;
160#ifdef CONFIG_NET_CLS_IND
161 if (!tcf_match_indev(skb, n->indev)) {
162 n = n->next;
163 goto next_knode;
164 }
165#endif
166#ifdef CONFIG_CLS_U32_PERF
167 n->pf->rhit +=1;
168#endif
169 r = tcf_exts_exec(skb, &n->exts, res);
170 if (r < 0) {
171 n = n->next;
172 goto next_knode;
173 }
174
175 return r;
176 }
177 n = n->next;
178 goto next_knode;
179 }
180
181
182 if (sdepth >= TC_U32_MAXDEPTH)
183 goto deadloop;
184 stack[sdepth].knode = n;
185 stack[sdepth].off = off;
186 sdepth++;
187
188 ht = n->ht_down;
189 sel = 0;
190 if (ht->divisor) {
191 __be32 *data, _data;
192
193 data = skb_header_pointer(skb, off + n->sel.hoff, 4,
194 &_data);
195 if (!data)
196 goto out;
197 sel = ht->divisor & u32_hash_fold(*data, &n->sel,
198 n->fshift);
199 }
200 if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
201 goto next_ht;
202
203 if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
204 off2 = n->sel.off + 3;
205 if (n->sel.flags & TC_U32_VAROFFSET) {
206 __be16 *data, _data;
207
208 data = skb_header_pointer(skb,
209 off + n->sel.offoff,
210 2, &_data);
211 if (!data)
212 goto out;
213 off2 += ntohs(n->sel.offmask & *data) >>
214 n->sel.offshift;
215 }
216 off2 &= ~3;
217 }
218 if (n->sel.flags&TC_U32_EAT) {
219 off += off2;
220 off2 = 0;
221 }
222
223 if (off < skb->len)
224 goto next_ht;
225 }
226
227
228 if (sdepth--) {
229 n = stack[sdepth].knode;
230 ht = n->ht_up;
231 off = stack[sdepth].off;
232 goto check_terminal;
233 }
234out:
235 return -1;
236
237deadloop:
238 if (net_ratelimit())
239 printk(KERN_WARNING "cls_u32: dead loop\n");
240 return -1;
241}
242
243static __inline__ struct tc_u_hnode *
244u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
245{
246 struct tc_u_hnode *ht;
247
248 for (ht = tp_c->hlist; ht; ht = ht->next)
249 if (ht->handle == handle)
250 break;
251
252 return ht;
253}
254
255static __inline__ struct tc_u_knode *
256u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
257{
258 unsigned sel;
259 struct tc_u_knode *n = NULL;
260
261 sel = TC_U32_HASH(handle);
262 if (sel > ht->divisor)
263 goto out;
264
265 for (n = ht->ht[sel]; n; n = n->next)
266 if (n->handle == handle)
267 break;
268out:
269 return n;
270}
271
272
273static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
274{
275 struct tc_u_hnode *ht;
276 struct tc_u_common *tp_c = tp->data;
277
278 if (TC_U32_HTID(handle) == TC_U32_ROOT)
279 ht = tp->root;
280 else
281 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
282
283 if (!ht)
284 return 0;
285
286 if (TC_U32_KEY(handle) == 0)
287 return (unsigned long)ht;
288
289 return (unsigned long)u32_lookup_key(ht, handle);
290}
291
292static void u32_put(struct tcf_proto *tp, unsigned long f)
293{
294}
295
296static u32 gen_new_htid(struct tc_u_common *tp_c)
297{
298 int i = 0x800;
299
300 do {
301 if (++tp_c->hgenerator == 0x7FF)
302 tp_c->hgenerator = 1;
303 } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
304
305 return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
306}
307
308static int u32_init(struct tcf_proto *tp)
309{
310 struct tc_u_hnode *root_ht;
311 struct tc_u_common *tp_c;
312
313 tp_c = tp->q->u32_node;
314
315 root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
316 if (root_ht == NULL)
317 return -ENOBUFS;
318
319 root_ht->divisor = 0;
320 root_ht->refcnt++;
321 root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
322 root_ht->prio = tp->prio;
323
324 if (tp_c == NULL) {
325 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
326 if (tp_c == NULL) {
327 kfree(root_ht);
328 return -ENOBUFS;
329 }
330 tp_c->q = tp->q;
331 tp->q->u32_node = tp_c;
332 }
333
334 tp_c->refcnt++;
335 root_ht->next = tp_c->hlist;
336 tp_c->hlist = root_ht;
337 root_ht->tp_c = tp_c;
338
339 tp->root = root_ht;
340 tp->data = tp_c;
341 return 0;
342}
343
344static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
345{
346 tcf_unbind_filter(tp, &n->res);
347 tcf_exts_destroy(tp, &n->exts);
348 if (n->ht_down)
349 n->ht_down->refcnt--;
350#ifdef CONFIG_CLS_U32_PERF
351 kfree(n->pf);
352#endif
353 kfree(n);
354 return 0;
355}
356
357static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
358{
359 struct tc_u_knode **kp;
360 struct tc_u_hnode *ht = key->ht_up;
361
362 if (ht) {
363 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
364 if (*kp == key) {
365 tcf_tree_lock(tp);
366 *kp = key->next;
367 tcf_tree_unlock(tp);
368
369 u32_destroy_key(tp, key);
370 return 0;
371 }
372 }
373 }
374 WARN_ON(1);
375 return 0;
376}
377
378static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
379{
380 struct tc_u_knode *n;
381 unsigned h;
382
383 for (h=0; h<=ht->divisor; h++) {
384 while ((n = ht->ht[h]) != NULL) {
385 ht->ht[h] = n->next;
386
387 u32_destroy_key(tp, n);
388 }
389 }
390}
391
392static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
393{
394 struct tc_u_common *tp_c = tp->data;
395 struct tc_u_hnode **hn;
396
397 WARN_ON(ht->refcnt);
398
399 u32_clear_hnode(tp, ht);
400
401 for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
402 if (*hn == ht) {
403 *hn = ht->next;
404 kfree(ht);
405 return 0;
406 }
407 }
408
409 WARN_ON(1);
410 return -ENOENT;
411}
412
413static void u32_destroy(struct tcf_proto *tp)
414{
415 struct tc_u_common *tp_c = tp->data;
416 struct tc_u_hnode *root_ht = tp->root;
417
418 WARN_ON(root_ht == NULL);
419
420 if (root_ht && --root_ht->refcnt == 0)
421 u32_destroy_hnode(tp, root_ht);
422
423 if (--tp_c->refcnt == 0) {
424 struct tc_u_hnode *ht;
425
426 tp->q->u32_node = NULL;
427
428 for (ht = tp_c->hlist; ht; ht = ht->next) {
429 ht->refcnt--;
430 u32_clear_hnode(tp, ht);
431 }
432
433 while ((ht = tp_c->hlist) != NULL) {
434 tp_c->hlist = ht->next;
435
436 WARN_ON(ht->refcnt != 0);
437
438 kfree(ht);
439 }
440
441 kfree(tp_c);
442 }
443
444 tp->data = NULL;
445}
446
447static int u32_delete(struct tcf_proto *tp, unsigned long arg)
448{
449 struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
450
451 if (ht == NULL)
452 return 0;
453
454 if (TC_U32_KEY(ht->handle))
455 return u32_delete_key(tp, (struct tc_u_knode*)ht);
456
457 if (tp->root == ht)
458 return -EINVAL;
459
460 if (ht->refcnt == 1) {
461 ht->refcnt--;
462 u32_destroy_hnode(tp, ht);
463 } else {
464 return -EBUSY;
465 }
466
467 return 0;
468}
469
470static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
471{
472 struct tc_u_knode *n;
473 unsigned i = 0x7FF;
474
475 for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
476 if (i < TC_U32_NODE(n->handle))
477 i = TC_U32_NODE(n->handle);
478 i++;
479
480 return handle|(i>0xFFF ? 0xFFF : i);
481}
482
483static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
484 [TCA_U32_CLASSID] = { .type = NLA_U32 },
485 [TCA_U32_HASH] = { .type = NLA_U32 },
486 [TCA_U32_LINK] = { .type = NLA_U32 },
487 [TCA_U32_DIVISOR] = { .type = NLA_U32 },
488 [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
489 [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
490 [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
491};
492
493static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
494 struct tc_u_hnode *ht,
495 struct tc_u_knode *n, struct nlattr **tb,
496 struct nlattr *est)
497{
498 int err;
499 struct tcf_exts e;
500
501 err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
502 if (err < 0)
503 return err;
504
505 err = -EINVAL;
506 if (tb[TCA_U32_LINK]) {
507 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
508 struct tc_u_hnode *ht_down = NULL, *ht_old;
509
510 if (TC_U32_KEY(handle))
511 goto errout;
512
513 if (handle) {
514 ht_down = u32_lookup_ht(ht->tp_c, handle);
515
516 if (ht_down == NULL)
517 goto errout;
518 ht_down->refcnt++;
519 }
520
521 tcf_tree_lock(tp);
522 ht_old = n->ht_down;
523 n->ht_down = ht_down;
524 tcf_tree_unlock(tp);
525
526 if (ht_old)
527 ht_old->refcnt--;
528 }
529 if (tb[TCA_U32_CLASSID]) {
530 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
531 tcf_bind_filter(tp, &n->res, base);
532 }
533
534#ifdef CONFIG_NET_CLS_IND
535 if (tb[TCA_U32_INDEV]) {
536 err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
537 if (err < 0)
538 goto errout;
539 }
540#endif
541 tcf_exts_change(tp, &n->exts, &e);
542
543 return 0;
544errout:
545 tcf_exts_destroy(tp, &e);
546 return err;
547}
548
549static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
550 struct nlattr **tca,
551 unsigned long *arg)
552{
553 struct tc_u_common *tp_c = tp->data;
554 struct tc_u_hnode *ht;
555 struct tc_u_knode *n;
556 struct tc_u32_sel *s;
557 struct nlattr *opt = tca[TCA_OPTIONS];
558 struct nlattr *tb[TCA_U32_MAX + 1];
559 u32 htid;
560 int err;
561
562 if (opt == NULL)
563 return handle ? -EINVAL : 0;
564
565 err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
566 if (err < 0)
567 return err;
568
569 if ((n = (struct tc_u_knode*)*arg) != NULL) {
570 if (TC_U32_KEY(n->handle) == 0)
571 return -EINVAL;
572
573 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE]);
574 }
575
576 if (tb[TCA_U32_DIVISOR]) {
577 unsigned divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
578
579 if (--divisor > 0x100)
580 return -EINVAL;
581 if (TC_U32_KEY(handle))
582 return -EINVAL;
583 if (handle == 0) {
584 handle = gen_new_htid(tp->data);
585 if (handle == 0)
586 return -ENOMEM;
587 }
588 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
589 if (ht == NULL)
590 return -ENOBUFS;
591 ht->tp_c = tp_c;
592 ht->refcnt = 1;
593 ht->divisor = divisor;
594 ht->handle = handle;
595 ht->prio = tp->prio;
596 ht->next = tp_c->hlist;
597 tp_c->hlist = ht;
598 *arg = (unsigned long)ht;
599 return 0;
600 }
601
602 if (tb[TCA_U32_HASH]) {
603 htid = nla_get_u32(tb[TCA_U32_HASH]);
604 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
605 ht = tp->root;
606 htid = ht->handle;
607 } else {
608 ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
609 if (ht == NULL)
610 return -EINVAL;
611 }
612 } else {
613 ht = tp->root;
614 htid = ht->handle;
615 }
616
617 if (ht->divisor < TC_U32_HASH(htid))
618 return -EINVAL;
619
620 if (handle) {
621 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
622 return -EINVAL;
623 handle = htid | TC_U32_NODE(handle);
624 } else
625 handle = gen_new_kid(ht, htid);
626
627 if (tb[TCA_U32_SEL] == NULL)
628 return -EINVAL;
629
630 s = nla_data(tb[TCA_U32_SEL]);
631
632 n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
633 if (n == NULL)
634 return -ENOBUFS;
635
636#ifdef CONFIG_CLS_U32_PERF
637 n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
638 if (n->pf == NULL) {
639 kfree(n);
640 return -ENOBUFS;
641 }
642#endif
643
644 memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
645 n->ht_up = ht;
646 n->handle = handle;
647 n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
648
649#ifdef CONFIG_CLS_U32_MARK
650 if (tb[TCA_U32_MARK]) {
651 struct tc_u32_mark *mark;
652
653 mark = nla_data(tb[TCA_U32_MARK]);
654 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
655 n->mark.success = 0;
656 }
657#endif
658
659 err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE]);
660 if (err == 0) {
661 struct tc_u_knode **ins;
662 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
663 if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
664 break;
665
666 n->next = *ins;
667 tcf_tree_lock(tp);
668 *ins = n;
669 tcf_tree_unlock(tp);
670
671 *arg = (unsigned long)n;
672 return 0;
673 }
674#ifdef CONFIG_CLS_U32_PERF
675 kfree(n->pf);
676#endif
677 kfree(n);
678 return err;
679}
680
681static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
682{
683 struct tc_u_common *tp_c = tp->data;
684 struct tc_u_hnode *ht;
685 struct tc_u_knode *n;
686 unsigned h;
687
688 if (arg->stop)
689 return;
690
691 for (ht = tp_c->hlist; ht; ht = ht->next) {
692 if (ht->prio != tp->prio)
693 continue;
694 if (arg->count >= arg->skip) {
695 if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
696 arg->stop = 1;
697 return;
698 }
699 }
700 arg->count++;
701 for (h = 0; h <= ht->divisor; h++) {
702 for (n = ht->ht[h]; n; n = n->next) {
703 if (arg->count < arg->skip) {
704 arg->count++;
705 continue;
706 }
707 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
708 arg->stop = 1;
709 return;
710 }
711 arg->count++;
712 }
713 }
714 }
715}
716
717static int u32_dump(struct tcf_proto *tp, unsigned long fh,
718 struct sk_buff *skb, struct tcmsg *t)
719{
720 struct tc_u_knode *n = (struct tc_u_knode*)fh;
721 struct nlattr *nest;
722
723 if (n == NULL)
724 return skb->len;
725
726 t->tcm_handle = n->handle;
727
728 nest = nla_nest_start(skb, TCA_OPTIONS);
729 if (nest == NULL)
730 goto nla_put_failure;
731
732 if (TC_U32_KEY(n->handle) == 0) {
733 struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
734 u32 divisor = ht->divisor+1;
735 NLA_PUT_U32(skb, TCA_U32_DIVISOR, divisor);
736 } else {
737 NLA_PUT(skb, TCA_U32_SEL,
738 sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
739 &n->sel);
740 if (n->ht_up) {
741 u32 htid = n->handle & 0xFFFFF000;
742 NLA_PUT_U32(skb, TCA_U32_HASH, htid);
743 }
744 if (n->res.classid)
745 NLA_PUT_U32(skb, TCA_U32_CLASSID, n->res.classid);
746 if (n->ht_down)
747 NLA_PUT_U32(skb, TCA_U32_LINK, n->ht_down->handle);
748
749#ifdef CONFIG_CLS_U32_MARK
750 if (n->mark.val || n->mark.mask)
751 NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
752#endif
753
754 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
755 goto nla_put_failure;
756
757#ifdef CONFIG_NET_CLS_IND
758 if(strlen(n->indev))
759 NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev);
760#endif
761#ifdef CONFIG_CLS_U32_PERF
762 NLA_PUT(skb, TCA_U32_PCNT,
763 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
764 n->pf);
765#endif
766 }
767
768 nla_nest_end(skb, nest);
769
770 if (TC_U32_KEY(n->handle))
771 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
772 goto nla_put_failure;
773 return skb->len;
774
775nla_put_failure:
776 nla_nest_cancel(skb, nest);
777 return -1;
778}
779
780static struct tcf_proto_ops cls_u32_ops __read_mostly = {
781 .kind = "u32",
782 .classify = u32_classify,
783 .init = u32_init,
784 .destroy = u32_destroy,
785 .get = u32_get,
786 .put = u32_put,
787 .change = u32_change,
788 .delete = u32_delete,
789 .walk = u32_walk,
790 .dump = u32_dump,
791 .owner = THIS_MODULE,
792};
793
794static int __init init_u32(void)
795{
796 pr_info("u32 classifier\n");
797#ifdef CONFIG_CLS_U32_PERF
798 pr_info(" Performance counters on\n");
799#endif
800#ifdef CONFIG_NET_CLS_IND
801 pr_info(" input device check on\n");
802#endif
803#ifdef CONFIG_NET_CLS_ACT
804 pr_info(" Actions configured\n");
805#endif
806 return register_tcf_proto_ops(&cls_u32_ops);
807}
808
809static void __exit exit_u32(void)
810{
811 unregister_tcf_proto_ops(&cls_u32_ops);
812}
813
814module_init(init_u32)
815module_exit(exit_u32)
816MODULE_LICENSE("GPL");
817
