[NET]: kfree cleanup
[linux-2.6.git] / net / sched / cls_u32.c
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 <asm/uaccess.h>
34 #include <asm/system.h>
35 #include <linux/bitops.h>
36 #include <linux/config.h>
37 #include <linux/module.h>
38 #include <linux/types.h>
39 #include <linux/kernel.h>
40 #include <linux/sched.h>
41 #include <linux/string.h>
42 #include <linux/mm.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/in.h>
46 #include <linux/errno.h>
47 #include <linux/interrupt.h>
48 #include <linux/if_ether.h>
49 #include <linux/inet.h>
50 #include <linux/netdevice.h>
51 #include <linux/etherdevice.h>
52 #include <linux/notifier.h>
53 #include <linux/rtnetlink.h>
54 #include <net/ip.h>
55 #include <net/route.h>
56 #include <linux/skbuff.h>
57 #include <net/sock.h>
58 #include <net/act_api.h>
59 #include <net/pkt_cls.h>
60
61 struct tc_u_knode
62 {
63         struct tc_u_knode       *next;
64         u32                     handle;
65         struct tc_u_hnode       *ht_up;
66         struct tcf_exts         exts;
67 #ifdef CONFIG_NET_CLS_IND
68         char                     indev[IFNAMSIZ];
69 #endif
70         u8                      fshift;
71         struct tcf_result       res;
72         struct tc_u_hnode       *ht_down;
73 #ifdef CONFIG_CLS_U32_PERF
74         struct tc_u32_pcnt      *pf;
75 #endif
76 #ifdef CONFIG_CLS_U32_MARK
77         struct tc_u32_mark      mark;
78 #endif
79         struct tc_u32_sel       sel;
80 };
81
82 struct tc_u_hnode
83 {
84         struct tc_u_hnode       *next;
85         u32                     handle;
86         u32                     prio;
87         struct tc_u_common      *tp_c;
88         int                     refcnt;
89         unsigned                divisor;
90         struct tc_u_knode       *ht[1];
91 };
92
93 struct tc_u_common
94 {
95         struct tc_u_common      *next;
96         struct tc_u_hnode       *hlist;
97         struct Qdisc            *q;
98         int                     refcnt;
99         u32                     hgenerator;
100 };
101
102 static struct tcf_ext_map u32_ext_map = {
103         .action = TCA_U32_ACT,
104         .police = TCA_U32_POLICE
105 };
106
107 static struct tc_u_common *u32_list;
108
109 static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel, u8 fshift)
110 {
111         unsigned h = (key & sel->hmask)>>fshift;
112
113         return h;
114 }
115
116 static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
117 {
118         struct {
119                 struct tc_u_knode *knode;
120                 u8                *ptr;
121         } stack[TC_U32_MAXDEPTH];
122
123         struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
124         u8 *ptr = skb->nh.raw;
125         struct tc_u_knode *n;
126         int sdepth = 0;
127         int off2 = 0;
128         int sel = 0;
129 #ifdef CONFIG_CLS_U32_PERF
130         int j;
131 #endif
132         int i, r;
133
134 next_ht:
135         n = ht->ht[sel];
136
137 next_knode:
138         if (n) {
139                 struct tc_u32_key *key = n->sel.keys;
140
141 #ifdef CONFIG_CLS_U32_PERF
142                 n->pf->rcnt +=1;
143                 j = 0;
144 #endif
145
146 #ifdef CONFIG_CLS_U32_MARK
147                 if ((skb->nfmark & n->mark.mask) != n->mark.val) {
148                         n = n->next;
149                         goto next_knode;
150                 } else {
151                         n->mark.success++;
152                 }
153 #endif
154
155                 for (i = n->sel.nkeys; i>0; i--, key++) {
156
157                         if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
158                                 n = n->next;
159                                 goto next_knode;
160                         }
161 #ifdef CONFIG_CLS_U32_PERF
162                         n->pf->kcnts[j] +=1;
163                         j++;
164 #endif
165                 }
166                 if (n->ht_down == NULL) {
167 check_terminal:
168                         if (n->sel.flags&TC_U32_TERMINAL) {
169
170                                 *res = n->res;
171 #ifdef CONFIG_NET_CLS_IND
172                                 if (!tcf_match_indev(skb, n->indev)) {
173                                         n = n->next;
174                                         goto next_knode;
175                                 }
176 #endif
177 #ifdef CONFIG_CLS_U32_PERF
178                                 n->pf->rhit +=1;
179 #endif
180                                 r = tcf_exts_exec(skb, &n->exts, res);
181                                 if (r < 0) {
182                                         n = n->next;
183                                         goto next_knode;
184                                 }
185
186                                 return r;
187                         }
188                         n = n->next;
189                         goto next_knode;
190                 }
191
192                 /* PUSH */
193                 if (sdepth >= TC_U32_MAXDEPTH)
194                         goto deadloop;
195                 stack[sdepth].knode = n;
196                 stack[sdepth].ptr = ptr;
197                 sdepth++;
198
199                 ht = n->ht_down;
200                 sel = 0;
201                 if (ht->divisor)
202                         sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel,n->fshift);
203
204                 if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
205                         goto next_ht;
206
207                 if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
208                         off2 = n->sel.off + 3;
209                         if (n->sel.flags&TC_U32_VAROFFSET)
210                                 off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
211                         off2 &= ~3;
212                 }
213                 if (n->sel.flags&TC_U32_EAT) {
214                         ptr += off2;
215                         off2 = 0;
216                 }
217
218                 if (ptr < skb->tail)
219                         goto next_ht;
220         }
221
222         /* POP */
223         if (sdepth--) {
224                 n = stack[sdepth].knode;
225                 ht = n->ht_up;
226                 ptr = stack[sdepth].ptr;
227                 goto check_terminal;
228         }
229         return -1;
230
231 deadloop:
232         if (net_ratelimit())
233                 printk("cls_u32: dead loop\n");
234         return -1;
235 }
236
237 static __inline__ struct tc_u_hnode *
238 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
239 {
240         struct tc_u_hnode *ht;
241
242         for (ht = tp_c->hlist; ht; ht = ht->next)
243                 if (ht->handle == handle)
244                         break;
245
246         return ht;
247 }
248
249 static __inline__ struct tc_u_knode *
250 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
251 {
252         unsigned sel;
253         struct tc_u_knode *n = NULL;
254
255         sel = TC_U32_HASH(handle);
256         if (sel > ht->divisor)
257                 goto out;
258
259         for (n = ht->ht[sel]; n; n = n->next)
260                 if (n->handle == handle)
261                         break;
262 out:
263         return n;
264 }
265
266
267 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
268 {
269         struct tc_u_hnode *ht;
270         struct tc_u_common *tp_c = tp->data;
271
272         if (TC_U32_HTID(handle) == TC_U32_ROOT)
273                 ht = tp->root;
274         else
275                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
276
277         if (!ht)
278                 return 0;
279
280         if (TC_U32_KEY(handle) == 0)
281                 return (unsigned long)ht;
282
283         return (unsigned long)u32_lookup_key(ht, handle);
284 }
285
286 static void u32_put(struct tcf_proto *tp, unsigned long f)
287 {
288 }
289
290 static u32 gen_new_htid(struct tc_u_common *tp_c)
291 {
292         int i = 0x800;
293
294         do {
295                 if (++tp_c->hgenerator == 0x7FF)
296                         tp_c->hgenerator = 1;
297         } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
298
299         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
300 }
301
302 static int u32_init(struct tcf_proto *tp)
303 {
304         struct tc_u_hnode *root_ht;
305         struct tc_u_common *tp_c;
306
307         for (tp_c = u32_list; tp_c; tp_c = tp_c->next)
308                 if (tp_c->q == tp->q)
309                         break;
310
311         root_ht = kmalloc(sizeof(*root_ht), GFP_KERNEL);
312         if (root_ht == NULL)
313                 return -ENOBUFS;
314
315         memset(root_ht, 0, sizeof(*root_ht));
316         root_ht->divisor = 0;
317         root_ht->refcnt++;
318         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
319         root_ht->prio = tp->prio;
320
321         if (tp_c == NULL) {
322                 tp_c = kmalloc(sizeof(*tp_c), GFP_KERNEL);
323                 if (tp_c == NULL) {
324                         kfree(root_ht);
325                         return -ENOBUFS;
326                 }
327                 memset(tp_c, 0, sizeof(*tp_c));
328                 tp_c->q = tp->q;
329                 tp_c->next = u32_list;
330                 u32_list = tp_c;
331         }
332
333         tp_c->refcnt++;
334         root_ht->next = tp_c->hlist;
335         tp_c->hlist = root_ht;
336         root_ht->tp_c = tp_c;
337
338         tp->root = root_ht;
339         tp->data = tp_c;
340         return 0;
341 }
342
343 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
344 {
345         tcf_unbind_filter(tp, &n->res);
346         tcf_exts_destroy(tp, &n->exts);
347         if (n->ht_down)
348                 n->ht_down->refcnt--;
349 #ifdef CONFIG_CLS_U32_PERF
350         if (n)
351                 kfree(n->pf);
352 #endif
353         kfree(n);
354         return 0;
355 }
356
357 static 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         BUG_TRAP(0);
375         return 0;
376 }
377
378 static 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
392 static 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         BUG_TRAP(!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         BUG_TRAP(0);
410         return -ENOENT;
411 }
412
413 static void u32_destroy(struct tcf_proto *tp)
414 {
415         struct tc_u_common *tp_c = tp->data;
416         struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);
417
418         BUG_TRAP(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                 struct tc_u_common **tp_cp;
426
427                 for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) {
428                         if (*tp_cp == tp_c) {
429                                 *tp_cp = tp_c->next;
430                                 break;
431                         }
432                 }
433
434                 for (ht=tp_c->hlist; ht; ht = ht->next)
435                         u32_clear_hnode(tp, ht);
436
437                 while ((ht = tp_c->hlist) != NULL) {
438                         tp_c->hlist = ht->next;
439
440                         BUG_TRAP(ht->refcnt == 0);
441
442                         kfree(ht);
443                 };
444
445                 kfree(tp_c);
446         }
447
448         tp->data = NULL;
449 }
450
451 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
452 {
453         struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
454
455         if (ht == NULL)
456                 return 0;
457
458         if (TC_U32_KEY(ht->handle))
459                 return u32_delete_key(tp, (struct tc_u_knode*)ht);
460
461         if (tp->root == ht)
462                 return -EINVAL;
463
464         if (--ht->refcnt == 0)
465                 u32_destroy_hnode(tp, ht);
466
467         return 0;
468 }
469
470 static 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
483 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
484                          struct tc_u_hnode *ht,
485                          struct tc_u_knode *n, struct rtattr **tb,
486                          struct rtattr *est)
487 {
488         int err;
489         struct tcf_exts e;
490
491         err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
492         if (err < 0)
493                 return err;
494
495         err = -EINVAL;
496         if (tb[TCA_U32_LINK-1]) {
497                 u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]);
498                 struct tc_u_hnode *ht_down = NULL;
499
500                 if (TC_U32_KEY(handle))
501                         goto errout;
502
503                 if (handle) {
504                         ht_down = u32_lookup_ht(ht->tp_c, handle);
505
506                         if (ht_down == NULL)
507                                 goto errout;
508                         ht_down->refcnt++;
509                 }
510
511                 tcf_tree_lock(tp);
512                 ht_down = xchg(&n->ht_down, ht_down);
513                 tcf_tree_unlock(tp);
514
515                 if (ht_down)
516                         ht_down->refcnt--;
517         }
518         if (tb[TCA_U32_CLASSID-1]) {
519                 n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]);
520                 tcf_bind_filter(tp, &n->res, base);
521         }
522
523 #ifdef CONFIG_NET_CLS_IND
524         if (tb[TCA_U32_INDEV-1]) {
525                 int err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV-1]);
526                 if (err < 0)
527                         goto errout;
528         }
529 #endif
530         tcf_exts_change(tp, &n->exts, &e);
531
532         return 0;
533 errout:
534         tcf_exts_destroy(tp, &e);
535         return err;
536 }
537
538 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
539                       struct rtattr **tca,
540                       unsigned long *arg)
541 {
542         struct tc_u_common *tp_c = tp->data;
543         struct tc_u_hnode *ht;
544         struct tc_u_knode *n;
545         struct tc_u32_sel *s;
546         struct rtattr *opt = tca[TCA_OPTIONS-1];
547         struct rtattr *tb[TCA_U32_MAX];
548         u32 htid;
549         int err;
550
551         if (opt == NULL)
552                 return handle ? -EINVAL : 0;
553
554         if (rtattr_parse_nested(tb, TCA_U32_MAX, opt) < 0)
555                 return -EINVAL;
556
557         if ((n = (struct tc_u_knode*)*arg) != NULL) {
558                 if (TC_U32_KEY(n->handle) == 0)
559                         return -EINVAL;
560
561                 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE-1]);
562         }
563
564         if (tb[TCA_U32_DIVISOR-1]) {
565                 unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]);
566
567                 if (--divisor > 0x100)
568                         return -EINVAL;
569                 if (TC_U32_KEY(handle))
570                         return -EINVAL;
571                 if (handle == 0) {
572                         handle = gen_new_htid(tp->data);
573                         if (handle == 0)
574                                 return -ENOMEM;
575                 }
576                 ht = kmalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
577                 if (ht == NULL)
578                         return -ENOBUFS;
579                 memset(ht, 0, sizeof(*ht) + divisor*sizeof(void*));
580                 ht->tp_c = tp_c;
581                 ht->refcnt = 0;
582                 ht->divisor = divisor;
583                 ht->handle = handle;
584                 ht->prio = tp->prio;
585                 ht->next = tp_c->hlist;
586                 tp_c->hlist = ht;
587                 *arg = (unsigned long)ht;
588                 return 0;
589         }
590
591         if (tb[TCA_U32_HASH-1]) {
592                 htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]);
593                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
594                         ht = tp->root;
595                         htid = ht->handle;
596                 } else {
597                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
598                         if (ht == NULL)
599                                 return -EINVAL;
600                 }
601         } else {
602                 ht = tp->root;
603                 htid = ht->handle;
604         }
605
606         if (ht->divisor < TC_U32_HASH(htid))
607                 return -EINVAL;
608
609         if (handle) {
610                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
611                         return -EINVAL;
612                 handle = htid | TC_U32_NODE(handle);
613         } else
614                 handle = gen_new_kid(ht, htid);
615
616         if (tb[TCA_U32_SEL-1] == 0 ||
617             RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
618                 return -EINVAL;
619
620         s = RTA_DATA(tb[TCA_U32_SEL-1]);
621
622         n = kmalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
623         if (n == NULL)
624                 return -ENOBUFS;
625
626         memset(n, 0, sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key));
627 #ifdef CONFIG_CLS_U32_PERF
628         n->pf = kmalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
629         if (n->pf == NULL) {
630                 kfree(n);
631                 return -ENOBUFS;
632         }
633         memset(n->pf, 0, sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64));
634 #endif
635
636         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
637         n->ht_up = ht;
638         n->handle = handle;
639 {
640         u8 i = 0;
641         u32 mask = s->hmask;
642         if (mask) {
643                 while (!(mask & 1)) {
644                         i++;
645                         mask>>=1;
646                 }
647         }
648         n->fshift = i;
649 }
650
651 #ifdef CONFIG_CLS_U32_MARK
652         if (tb[TCA_U32_MARK-1]) {
653                 struct tc_u32_mark *mark;
654
655                 if (RTA_PAYLOAD(tb[TCA_U32_MARK-1]) < sizeof(struct tc_u32_mark)) {
656 #ifdef CONFIG_CLS_U32_PERF
657                         kfree(n->pf);
658 #endif
659                         kfree(n);
660                         return -EINVAL;
661                 }
662                 mark = RTA_DATA(tb[TCA_U32_MARK-1]);
663                 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
664                 n->mark.success = 0;
665         }
666 #endif
667
668         err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE-1]);
669         if (err == 0) {
670                 struct tc_u_knode **ins;
671                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
672                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
673                                 break;
674
675                 n->next = *ins;
676                 wmb();
677                 *ins = n;
678
679                 *arg = (unsigned long)n;
680                 return 0;
681         }
682 #ifdef CONFIG_CLS_U32_PERF
683         if (n)
684                 kfree(n->pf);
685 #endif
686         kfree(n);
687         return err;
688 }
689
690 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
691 {
692         struct tc_u_common *tp_c = tp->data;
693         struct tc_u_hnode *ht;
694         struct tc_u_knode *n;
695         unsigned h;
696
697         if (arg->stop)
698                 return;
699
700         for (ht = tp_c->hlist; ht; ht = ht->next) {
701                 if (ht->prio != tp->prio)
702                         continue;
703                 if (arg->count >= arg->skip) {
704                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
705                                 arg->stop = 1;
706                                 return;
707                         }
708                 }
709                 arg->count++;
710                 for (h = 0; h <= ht->divisor; h++) {
711                         for (n = ht->ht[h]; n; n = n->next) {
712                                 if (arg->count < arg->skip) {
713                                         arg->count++;
714                                         continue;
715                                 }
716                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
717                                         arg->stop = 1;
718                                         return;
719                                 }
720                                 arg->count++;
721                         }
722                 }
723         }
724 }
725
726 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
727                      struct sk_buff *skb, struct tcmsg *t)
728 {
729         struct tc_u_knode *n = (struct tc_u_knode*)fh;
730         unsigned char    *b = skb->tail;
731         struct rtattr *rta;
732
733         if (n == NULL)
734                 return skb->len;
735
736         t->tcm_handle = n->handle;
737
738         rta = (struct rtattr*)b;
739         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
740
741         if (TC_U32_KEY(n->handle) == 0) {
742                 struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
743                 u32 divisor = ht->divisor+1;
744                 RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor);
745         } else {
746                 RTA_PUT(skb, TCA_U32_SEL,
747                         sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
748                         &n->sel);
749                 if (n->ht_up) {
750                         u32 htid = n->handle & 0xFFFFF000;
751                         RTA_PUT(skb, TCA_U32_HASH, 4, &htid);
752                 }
753                 if (n->res.classid)
754                         RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid);
755                 if (n->ht_down)
756                         RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle);
757
758 #ifdef CONFIG_CLS_U32_MARK
759                 if (n->mark.val || n->mark.mask)
760                         RTA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
761 #endif
762
763                 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
764                         goto rtattr_failure;
765
766 #ifdef CONFIG_NET_CLS_IND
767                 if(strlen(n->indev))
768                         RTA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev);
769 #endif
770 #ifdef CONFIG_CLS_U32_PERF
771                 RTA_PUT(skb, TCA_U32_PCNT, 
772                 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
773                         n->pf);
774 #endif
775         }
776
777         rta->rta_len = skb->tail - b;
778         if (TC_U32_KEY(n->handle))
779                 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
780                         goto rtattr_failure;
781         return skb->len;
782
783 rtattr_failure:
784         skb_trim(skb, b - skb->data);
785         return -1;
786 }
787
788 static struct tcf_proto_ops cls_u32_ops = {
789         .next           =       NULL,
790         .kind           =       "u32",
791         .classify       =       u32_classify,
792         .init           =       u32_init,
793         .destroy        =       u32_destroy,
794         .get            =       u32_get,
795         .put            =       u32_put,
796         .change         =       u32_change,
797         .delete         =       u32_delete,
798         .walk           =       u32_walk,
799         .dump           =       u32_dump,
800         .owner          =       THIS_MODULE,
801 };
802
803 static int __init init_u32(void)
804 {
805         printk("u32 classifier\n");
806 #ifdef CONFIG_CLS_U32_PERF
807         printk("    Perfomance counters on\n");
808 #endif
809 #ifdef CONFIG_NET_CLS_POLICE
810         printk("    OLD policer on \n");
811 #endif
812 #ifdef CONFIG_NET_CLS_IND
813         printk("    input device check on \n");
814 #endif
815 #ifdef CONFIG_NET_CLS_ACT
816         printk("    Actions configured \n");
817 #endif
818         return register_tcf_proto_ops(&cls_u32_ops);
819 }
820
821 static void __exit exit_u32(void) 
822 {
823         unregister_tcf_proto_ops(&cls_u32_ops);
824 }
825
826 module_init(init_u32)
827 module_exit(exit_u32)
828 MODULE_LICENSE("GPL");