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pkt_sched: cls_u32: Fix locking in u32_change()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / sched / cls_u32.c
blobea51fcd2ac8e26560035d5e38963122c37c931d5
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
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_hnode *hlist;
79 struct Qdisc *q;
80 int refcnt;
81 u32 hgenerator;
82 };
83
84 static const struct tcf_ext_map u32_ext_map = {
85 .action = TCA_U32_ACT,
86 .police = TCA_U32_POLICE
87 };
88
89 static __inline__ unsigned u32_hash_fold(__be32 key, struct tc_u32_sel *sel, u8 fshift)
90 {
91 unsigned h = ntohl(key & sel->hmask)>>fshift;
92
93 return h;
94 }
95
96 static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
97 {
98 struct {
99 struct tc_u_knode *knode;
100 u8 *ptr;
101 } stack[TC_U32_MAXDEPTH];
102
103 struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
104 u8 *ptr = skb_network_header(skb);
105 struct tc_u_knode *n;
106 int sdepth = 0;
107 int off2 = 0;
108 int sel = 0;
109 #ifdef CONFIG_CLS_U32_PERF
110 int j;
111 #endif
112 int i, r;
113
114 next_ht:
115 n = ht->ht[sel];
116
117 next_knode:
118 if (n) {
119 struct tc_u32_key *key = n->sel.keys;
120
121 #ifdef CONFIG_CLS_U32_PERF
122 n->pf->rcnt +=1;
123 j = 0;
124 #endif
125
126 #ifdef CONFIG_CLS_U32_MARK
127 if ((skb->mark & n->mark.mask) != n->mark.val) {
128 n = n->next;
129 goto next_knode;
130 } else {
131 n->mark.success++;
132 }
133 #endif
134
135 for (i = n->sel.nkeys; i>0; i--, key++) {
136
137 if ((*(__be32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
138 n = n->next;
139 goto next_knode;
140 }
141 #ifdef CONFIG_CLS_U32_PERF
142 n->pf->kcnts[j] +=1;
143 j++;
144 #endif
145 }
146 if (n->ht_down == NULL) {
147 check_terminal:
148 if (n->sel.flags&TC_U32_TERMINAL) {
149
150 *res = n->res;
151 #ifdef CONFIG_NET_CLS_IND
152 if (!tcf_match_indev(skb, n->indev)) {
153 n = n->next;
154 goto next_knode;
155 }
156 #endif
157 #ifdef CONFIG_CLS_U32_PERF
158 n->pf->rhit +=1;
159 #endif
160 r = tcf_exts_exec(skb, &n->exts, res);
161 if (r < 0) {
162 n = n->next;
163 goto next_knode;
164 }
165
166 return r;
167 }
168 n = n->next;
169 goto next_knode;
170 }
171
172 /* PUSH */
173 if (sdepth >= TC_U32_MAXDEPTH)
174 goto deadloop;
175 stack[sdepth].knode = n;
176 stack[sdepth].ptr = ptr;
177 sdepth++;
178
179 ht = n->ht_down;
180 sel = 0;
181 if (ht->divisor)
182 sel = ht->divisor&u32_hash_fold(*(__be32*)(ptr+n->sel.hoff), &n->sel,n->fshift);
183
184 if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
185 goto next_ht;
186
187 if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
188 off2 = n->sel.off + 3;
189 if (n->sel.flags&TC_U32_VAROFFSET)
190 off2 += ntohs(n->sel.offmask & *(__be16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
191 off2 &= ~3;
192 }
193 if (n->sel.flags&TC_U32_EAT) {
194 ptr += off2;
195 off2 = 0;
196 }
197
198 if (ptr < skb_tail_pointer(skb))
199 goto next_ht;
200 }
201
202 /* POP */
203 if (sdepth--) {
204 n = stack[sdepth].knode;
205 ht = n->ht_up;
206 ptr = stack[sdepth].ptr;
207 goto check_terminal;
208 }
209 return -1;
210
211 deadloop:
212 if (net_ratelimit())
213 printk("cls_u32: dead loop\n");
214 return -1;
215 }
216
217 static __inline__ struct tc_u_hnode *
218 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
219 {
220 struct tc_u_hnode *ht;
221
222 for (ht = tp_c->hlist; ht; ht = ht->next)
223 if (ht->handle == handle)
224 break;
225
226 return ht;
227 }
228
229 static __inline__ struct tc_u_knode *
230 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
231 {
232 unsigned sel;
233 struct tc_u_knode *n = NULL;
234
235 sel = TC_U32_HASH(handle);
236 if (sel > ht->divisor)
237 goto out;
238
239 for (n = ht->ht[sel]; n; n = n->next)
240 if (n->handle == handle)
241 break;
242 out:
243 return n;
244 }
245
246
247 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
248 {
249 struct tc_u_hnode *ht;
250 struct tc_u_common *tp_c = tp->data;
251
252 if (TC_U32_HTID(handle) == TC_U32_ROOT)
253 ht = tp->root;
254 else
255 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
256
257 if (!ht)
258 return 0;
259
260 if (TC_U32_KEY(handle) == 0)
261 return (unsigned long)ht;
262
263 return (unsigned long)u32_lookup_key(ht, handle);
264 }
265
266 static void u32_put(struct tcf_proto *tp, unsigned long f)
267 {
268 }
269
270 static u32 gen_new_htid(struct tc_u_common *tp_c)
271 {
272 int i = 0x800;
273
274 do {
275 if (++tp_c->hgenerator == 0x7FF)
276 tp_c->hgenerator = 1;
277 } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
278
279 return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
280 }
281
282 static int u32_init(struct tcf_proto *tp)
283 {
284 struct tc_u_hnode *root_ht;
285 struct tc_u_common *tp_c;
286
287 tp_c = tp->q->u32_node;
288
289 root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
290 if (root_ht == NULL)
291 return -ENOBUFS;
292
293 root_ht->divisor = 0;
294 root_ht->refcnt++;
295 root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
296 root_ht->prio = tp->prio;
297
298 if (tp_c == NULL) {
299 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
300 if (tp_c == NULL) {
301 kfree(root_ht);
302 return -ENOBUFS;
303 }
304 tp_c->q = tp->q;
305 tp->q->u32_node = tp_c;
306 }
307
308 tp_c->refcnt++;
309 root_ht->next = tp_c->hlist;
310 tp_c->hlist = root_ht;
311 root_ht->tp_c = tp_c;
312
313 tp->root = root_ht;
314 tp->data = tp_c;
315 return 0;
316 }
317
318 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
319 {
320 tcf_unbind_filter(tp, &n->res);
321 tcf_exts_destroy(tp, &n->exts);
322 if (n->ht_down)
323 n->ht_down->refcnt--;
324 #ifdef CONFIG_CLS_U32_PERF
325 kfree(n->pf);
326 #endif
327 kfree(n);
328 return 0;
329 }
330
331 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
332 {
333 struct tc_u_knode **kp;
334 struct tc_u_hnode *ht = key->ht_up;
335
336 if (ht) {
337 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
338 if (*kp == key) {
339 tcf_tree_lock(tp);
340 *kp = key->next;
341 tcf_tree_unlock(tp);
342
343 u32_destroy_key(tp, key);
344 return 0;
345 }
346 }
347 }
348 WARN_ON(1);
349 return 0;
350 }
351
352 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
353 {
354 struct tc_u_knode *n;
355 unsigned h;
356
357 for (h=0; h<=ht->divisor; h++) {
358 while ((n = ht->ht[h]) != NULL) {
359 ht->ht[h] = n->next;
360
361 u32_destroy_key(tp, n);
362 }
363 }
364 }
365
366 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
367 {
368 struct tc_u_common *tp_c = tp->data;
369 struct tc_u_hnode **hn;
370
371 WARN_ON(ht->refcnt);
372
373 u32_clear_hnode(tp, ht);
374
375 for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
376 if (*hn == ht) {
377 *hn = ht->next;
378 kfree(ht);
379 return 0;
380 }
381 }
382
383 WARN_ON(1);
384 return -ENOENT;
385 }
386
387 static void u32_destroy(struct tcf_proto *tp)
388 {
389 struct tc_u_common *tp_c = tp->data;
390 struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);
391
392 WARN_ON(root_ht == NULL);
393
394 if (root_ht && --root_ht->refcnt == 0)
395 u32_destroy_hnode(tp, root_ht);
396
397 if (--tp_c->refcnt == 0) {
398 struct tc_u_hnode *ht;
399
400 tp->q->u32_node = NULL;
401
402 for (ht = tp_c->hlist; ht; ht = ht->next) {
403 ht->refcnt--;
404 u32_clear_hnode(tp, ht);
405 }
406
407 while ((ht = tp_c->hlist) != NULL) {
408 tp_c->hlist = ht->next;
409
410 WARN_ON(ht->refcnt != 0);
411
412 kfree(ht);
413 }
414
415 kfree(tp_c);
416 }
417
418 tp->data = NULL;
419 }
420
421 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
422 {
423 struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
424
425 if (ht == NULL)
426 return 0;
427
428 if (TC_U32_KEY(ht->handle))
429 return u32_delete_key(tp, (struct tc_u_knode*)ht);
430
431 if (tp->root == ht)
432 return -EINVAL;
433
434 if (ht->refcnt == 1) {
435 ht->refcnt--;
436 u32_destroy_hnode(tp, ht);
437 } else {
438 return -EBUSY;
439 }
440
441 return 0;
442 }
443
444 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
445 {
446 struct tc_u_knode *n;
447 unsigned i = 0x7FF;
448
449 for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
450 if (i < TC_U32_NODE(n->handle))
451 i = TC_U32_NODE(n->handle);
452 i++;
453
454 return handle|(i>0xFFF ? 0xFFF : i);
455 }
456
457 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
458 [TCA_U32_CLASSID] = { .type = NLA_U32 },
459 [TCA_U32_HASH] = { .type = NLA_U32 },
460 [TCA_U32_LINK] = { .type = NLA_U32 },
461 [TCA_U32_DIVISOR] = { .type = NLA_U32 },
462 [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
463 [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
464 [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
465 };
466
467 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
468 struct tc_u_hnode *ht,
469 struct tc_u_knode *n, struct nlattr **tb,
470 struct nlattr *est)
471 {
472 int err;
473 struct tcf_exts e;
474
475 err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
476 if (err < 0)
477 return err;
478
479 err = -EINVAL;
480 if (tb[TCA_U32_LINK]) {
481 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
482 struct tc_u_hnode *ht_down = NULL;
483
484 if (TC_U32_KEY(handle))
485 goto errout;
486
487 if (handle) {
488 ht_down = u32_lookup_ht(ht->tp_c, handle);
489
490 if (ht_down == NULL)
491 goto errout;
492 ht_down->refcnt++;
493 }
494
495 tcf_tree_lock(tp);
496 ht_down = xchg(&n->ht_down, ht_down);
497 tcf_tree_unlock(tp);
498
499 if (ht_down)
500 ht_down->refcnt--;
501 }
502 if (tb[TCA_U32_CLASSID]) {
503 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
504 tcf_bind_filter(tp, &n->res, base);
505 }
506
507 #ifdef CONFIG_NET_CLS_IND
508 if (tb[TCA_U32_INDEV]) {
509 err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
510 if (err < 0)
511 goto errout;
512 }
513 #endif
514 tcf_exts_change(tp, &n->exts, &e);
515
516 return 0;
517 errout:
518 tcf_exts_destroy(tp, &e);
519 return err;
520 }
521
522 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
523 struct nlattr **tca,
524 unsigned long *arg)
525 {
526 struct tc_u_common *tp_c = tp->data;
527 struct tc_u_hnode *ht;
528 struct tc_u_knode *n;
529 struct tc_u32_sel *s;
530 struct nlattr *opt = tca[TCA_OPTIONS];
531 struct nlattr *tb[TCA_U32_MAX + 1];
532 u32 htid;
533 int err;
534
535 if (opt == NULL)
536 return handle ? -EINVAL : 0;
537
538 err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
539 if (err < 0)
540 return err;
541
542 if ((n = (struct tc_u_knode*)*arg) != NULL) {
543 if (TC_U32_KEY(n->handle) == 0)
544 return -EINVAL;
545
546 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE]);
547 }
548
549 if (tb[TCA_U32_DIVISOR]) {
550 unsigned divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
551
552 if (--divisor > 0x100)
553 return -EINVAL;
554 if (TC_U32_KEY(handle))
555 return -EINVAL;
556 if (handle == 0) {
557 handle = gen_new_htid(tp->data);
558 if (handle == 0)
559 return -ENOMEM;
560 }
561 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
562 if (ht == NULL)
563 return -ENOBUFS;
564 ht->tp_c = tp_c;
565 ht->refcnt = 1;
566 ht->divisor = divisor;
567 ht->handle = handle;
568 ht->prio = tp->prio;
569 ht->next = tp_c->hlist;
570 tp_c->hlist = ht;
571 *arg = (unsigned long)ht;
572 return 0;
573 }
574
575 if (tb[TCA_U32_HASH]) {
576 htid = nla_get_u32(tb[TCA_U32_HASH]);
577 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
578 ht = tp->root;
579 htid = ht->handle;
580 } else {
581 ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
582 if (ht == NULL)
583 return -EINVAL;
584 }
585 } else {
586 ht = tp->root;
587 htid = ht->handle;
588 }
589
590 if (ht->divisor < TC_U32_HASH(htid))
591 return -EINVAL;
592
593 if (handle) {
594 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
595 return -EINVAL;
596 handle = htid | TC_U32_NODE(handle);
597 } else
598 handle = gen_new_kid(ht, htid);
599
600 if (tb[TCA_U32_SEL] == NULL)
601 return -EINVAL;
602
603 s = nla_data(tb[TCA_U32_SEL]);
604
605 n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
606 if (n == NULL)
607 return -ENOBUFS;
608
609 #ifdef CONFIG_CLS_U32_PERF
610 n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
611 if (n->pf == NULL) {
612 kfree(n);
613 return -ENOBUFS;
614 }
615 #endif
616
617 memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
618 n->ht_up = ht;
619 n->handle = handle;
620 n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
621
622 #ifdef CONFIG_CLS_U32_MARK
623 if (tb[TCA_U32_MARK]) {
624 struct tc_u32_mark *mark;
625
626 mark = nla_data(tb[TCA_U32_MARK]);
627 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
628 n->mark.success = 0;
629 }
630 #endif
631
632 err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE]);
633 if (err == 0) {
634 struct tc_u_knode **ins;
635 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
636 if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
637 break;
638
639 n->next = *ins;
640 tcf_tree_lock(tp);
641 *ins = n;
642 tcf_tree_unlock(tp);
643
644 *arg = (unsigned long)n;
645 return 0;
646 }
647 #ifdef CONFIG_CLS_U32_PERF
648 kfree(n->pf);
649 #endif
650 kfree(n);
651 return err;
652 }
653
654 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
655 {
656 struct tc_u_common *tp_c = tp->data;
657 struct tc_u_hnode *ht;
658 struct tc_u_knode *n;
659 unsigned h;
660
661 if (arg->stop)
662 return;
663
664 for (ht = tp_c->hlist; ht; ht = ht->next) {
665 if (ht->prio != tp->prio)
666 continue;
667 if (arg->count >= arg->skip) {
668 if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
669 arg->stop = 1;
670 return;
671 }
672 }
673 arg->count++;
674 for (h = 0; h <= ht->divisor; h++) {
675 for (n = ht->ht[h]; n; n = n->next) {
676 if (arg->count < arg->skip) {
677 arg->count++;
678 continue;
679 }
680 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
681 arg->stop = 1;
682 return;
683 }
684 arg->count++;
685 }
686 }
687 }
688 }
689
690 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
691 struct sk_buff *skb, struct tcmsg *t)
692 {
693 struct tc_u_knode *n = (struct tc_u_knode*)fh;
694 struct nlattr *nest;
695
696 if (n == NULL)
697 return skb->len;
698
699 t->tcm_handle = n->handle;
700
701 nest = nla_nest_start(skb, TCA_OPTIONS);
702 if (nest == NULL)
703 goto nla_put_failure;
704
705 if (TC_U32_KEY(n->handle) == 0) {
706 struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
707 u32 divisor = ht->divisor+1;
708 NLA_PUT_U32(skb, TCA_U32_DIVISOR, divisor);
709 } else {
710 NLA_PUT(skb, TCA_U32_SEL,
711 sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
712 &n->sel);
713 if (n->ht_up) {
714 u32 htid = n->handle & 0xFFFFF000;
715 NLA_PUT_U32(skb, TCA_U32_HASH, htid);
716 }
717 if (n->res.classid)
718 NLA_PUT_U32(skb, TCA_U32_CLASSID, n->res.classid);
719 if (n->ht_down)
720 NLA_PUT_U32(skb, TCA_U32_LINK, n->ht_down->handle);
721
722 #ifdef CONFIG_CLS_U32_MARK
723 if (n->mark.val || n->mark.mask)
724 NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
725 #endif
726
727 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
728 goto nla_put_failure;
729
730 #ifdef CONFIG_NET_CLS_IND
731 if(strlen(n->indev))
732 NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev);
733 #endif
734 #ifdef CONFIG_CLS_U32_PERF
735 NLA_PUT(skb, TCA_U32_PCNT,
736 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
737 n->pf);
738 #endif
739 }
740
741 nla_nest_end(skb, nest);
742
743 if (TC_U32_KEY(n->handle))
744 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
745 goto nla_put_failure;
746 return skb->len;
747
748 nla_put_failure:
749 nla_nest_cancel(skb, nest);
750 return -1;
751 }
752
753 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
754 .kind = "u32",
755 .classify = u32_classify,
756 .init = u32_init,
757 .destroy = u32_destroy,
758 .get = u32_get,
759 .put = u32_put,
760 .change = u32_change,
761 .delete = u32_delete,
762 .walk = u32_walk,
763 .dump = u32_dump,
764 .owner = THIS_MODULE,
765 };
766
767 static int __init init_u32(void)
768 {
769 printk("u32 classifier\n");
770 #ifdef CONFIG_CLS_U32_PERF
771 printk(" Performance counters on\n");
772 #endif
773 #ifdef CONFIG_NET_CLS_IND
774 printk(" input device check on \n");
775 #endif
776 #ifdef CONFIG_NET_CLS_ACT
777 printk(" Actions configured \n");
778 #endif
779 return register_tcf_proto_ops(&cls_u32_ops);
780 }
781
782 static void __exit exit_u32(void)
783 {
784 unregister_tcf_proto_ops(&cls_u32_ops);
785 }
786
787 module_init(init_u32)
788 module_exit(exit_u32)
789 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree