[NET_SCHED]: cls_u32: remove unnecessary NULL-ptr check
[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         kfree(n->pf);
351 #endif
352         kfree(n);
353         return 0;
354 }
355
356 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
357 {
358         struct tc_u_knode **kp;
359         struct tc_u_hnode *ht = key->ht_up;
360
361         if (ht) {
362                 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
363                         if (*kp == key) {
364                                 tcf_tree_lock(tp);
365                                 *kp = key->next;
366                                 tcf_tree_unlock(tp);
367
368                                 u32_destroy_key(tp, key);
369                                 return 0;
370                         }
371                 }
372         }
373         BUG_TRAP(0);
374         return 0;
375 }
376
377 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
378 {
379         struct tc_u_knode *n;
380         unsigned h;
381
382         for (h=0; h<=ht->divisor; h++) {
383                 while ((n = ht->ht[h]) != NULL) {
384                         ht->ht[h] = n->next;
385
386                         u32_destroy_key(tp, n);
387                 }
388         }
389 }
390
391 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
392 {
393         struct tc_u_common *tp_c = tp->data;
394         struct tc_u_hnode **hn;
395
396         BUG_TRAP(!ht->refcnt);
397
398         u32_clear_hnode(tp, ht);
399
400         for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
401                 if (*hn == ht) {
402                         *hn = ht->next;
403                         kfree(ht);
404                         return 0;
405                 }
406         }
407
408         BUG_TRAP(0);
409         return -ENOENT;
410 }
411
412 static void u32_destroy(struct tcf_proto *tp)
413 {
414         struct tc_u_common *tp_c = tp->data;
415         struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);
416
417         BUG_TRAP(root_ht != NULL);
418
419         if (root_ht && --root_ht->refcnt == 0)
420                 u32_destroy_hnode(tp, root_ht);
421
422         if (--tp_c->refcnt == 0) {
423                 struct tc_u_hnode *ht;
424                 struct tc_u_common **tp_cp;
425
426                 for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) {
427                         if (*tp_cp == tp_c) {
428                                 *tp_cp = tp_c->next;
429                                 break;
430                         }
431                 }
432
433                 for (ht=tp_c->hlist; ht; ht = ht->next)
434                         u32_clear_hnode(tp, ht);
435
436                 while ((ht = tp_c->hlist) != NULL) {
437                         tp_c->hlist = ht->next;
438
439                         BUG_TRAP(ht->refcnt == 0);
440
441                         kfree(ht);
442                 };
443
444                 kfree(tp_c);
445         }
446
447         tp->data = NULL;
448 }
449
450 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
451 {
452         struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
453
454         if (ht == NULL)
455                 return 0;
456
457         if (TC_U32_KEY(ht->handle))
458                 return u32_delete_key(tp, (struct tc_u_knode*)ht);
459
460         if (tp->root == ht)
461                 return -EINVAL;
462
463         if (--ht->refcnt == 0)
464                 u32_destroy_hnode(tp, ht);
465
466         return 0;
467 }
468
469 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
470 {
471         struct tc_u_knode *n;
472         unsigned i = 0x7FF;
473
474         for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
475                 if (i < TC_U32_NODE(n->handle))
476                         i = TC_U32_NODE(n->handle);
477         i++;
478
479         return handle|(i>0xFFF ? 0xFFF : i);
480 }
481
482 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
483                          struct tc_u_hnode *ht,
484                          struct tc_u_knode *n, struct rtattr **tb,
485                          struct rtattr *est)
486 {
487         int err;
488         struct tcf_exts e;
489
490         err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
491         if (err < 0)
492                 return err;
493
494         err = -EINVAL;
495         if (tb[TCA_U32_LINK-1]) {
496                 u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]);
497                 struct tc_u_hnode *ht_down = NULL;
498
499                 if (TC_U32_KEY(handle))
500                         goto errout;
501
502                 if (handle) {
503                         ht_down = u32_lookup_ht(ht->tp_c, handle);
504
505                         if (ht_down == NULL)
506                                 goto errout;
507                         ht_down->refcnt++;
508                 }
509
510                 tcf_tree_lock(tp);
511                 ht_down = xchg(&n->ht_down, ht_down);
512                 tcf_tree_unlock(tp);
513
514                 if (ht_down)
515                         ht_down->refcnt--;
516         }
517         if (tb[TCA_U32_CLASSID-1]) {
518                 n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]);
519                 tcf_bind_filter(tp, &n->res, base);
520         }
521
522 #ifdef CONFIG_NET_CLS_IND
523         if (tb[TCA_U32_INDEV-1]) {
524                 int err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV-1]);
525                 if (err < 0)
526                         goto errout;
527         }
528 #endif
529         tcf_exts_change(tp, &n->exts, &e);
530
531         return 0;
532 errout:
533         tcf_exts_destroy(tp, &e);
534         return err;
535 }
536
537 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
538                       struct rtattr **tca,
539                       unsigned long *arg)
540 {
541         struct tc_u_common *tp_c = tp->data;
542         struct tc_u_hnode *ht;
543         struct tc_u_knode *n;
544         struct tc_u32_sel *s;
545         struct rtattr *opt = tca[TCA_OPTIONS-1];
546         struct rtattr *tb[TCA_U32_MAX];
547         u32 htid;
548         int err;
549
550         if (opt == NULL)
551                 return handle ? -EINVAL : 0;
552
553         if (rtattr_parse_nested(tb, TCA_U32_MAX, opt) < 0)
554                 return -EINVAL;
555
556         if ((n = (struct tc_u_knode*)*arg) != NULL) {
557                 if (TC_U32_KEY(n->handle) == 0)
558                         return -EINVAL;
559
560                 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE-1]);
561         }
562
563         if (tb[TCA_U32_DIVISOR-1]) {
564                 unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]);
565
566                 if (--divisor > 0x100)
567                         return -EINVAL;
568                 if (TC_U32_KEY(handle))
569                         return -EINVAL;
570                 if (handle == 0) {
571                         handle = gen_new_htid(tp->data);
572                         if (handle == 0)
573                                 return -ENOMEM;
574                 }
575                 ht = kmalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
576                 if (ht == NULL)
577                         return -ENOBUFS;
578                 memset(ht, 0, sizeof(*ht) + divisor*sizeof(void*));
579                 ht->tp_c = tp_c;
580                 ht->refcnt = 0;
581                 ht->divisor = divisor;
582                 ht->handle = handle;
583                 ht->prio = tp->prio;
584                 ht->next = tp_c->hlist;
585                 tp_c->hlist = ht;
586                 *arg = (unsigned long)ht;
587                 return 0;
588         }
589
590         if (tb[TCA_U32_HASH-1]) {
591                 htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]);
592                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
593                         ht = tp->root;
594                         htid = ht->handle;
595                 } else {
596                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
597                         if (ht == NULL)
598                                 return -EINVAL;
599                 }
600         } else {
601                 ht = tp->root;
602                 htid = ht->handle;
603         }
604
605         if (ht->divisor < TC_U32_HASH(htid))
606                 return -EINVAL;
607
608         if (handle) {
609                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
610                         return -EINVAL;
611                 handle = htid | TC_U32_NODE(handle);
612         } else
613                 handle = gen_new_kid(ht, htid);
614
615         if (tb[TCA_U32_SEL-1] == 0 ||
616             RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
617                 return -EINVAL;
618
619         s = RTA_DATA(tb[TCA_U32_SEL-1]);
620
621         n = kmalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
622         if (n == NULL)
623                 return -ENOBUFS;
624
625         memset(n, 0, sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key));
626 #ifdef CONFIG_CLS_U32_PERF
627         n->pf = kmalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
628         if (n->pf == NULL) {
629                 kfree(n);
630                 return -ENOBUFS;
631         }
632         memset(n->pf, 0, sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64));
633 #endif
634
635         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
636         n->ht_up = ht;
637         n->handle = handle;
638 {
639         u8 i = 0;
640         u32 mask = s->hmask;
641         if (mask) {
642                 while (!(mask & 1)) {
643                         i++;
644                         mask>>=1;
645                 }
646         }
647         n->fshift = i;
648 }
649
650 #ifdef CONFIG_CLS_U32_MARK
651         if (tb[TCA_U32_MARK-1]) {
652                 struct tc_u32_mark *mark;
653
654                 if (RTA_PAYLOAD(tb[TCA_U32_MARK-1]) < sizeof(struct tc_u32_mark)) {
655 #ifdef CONFIG_CLS_U32_PERF
656                         kfree(n->pf);
657 #endif
658                         kfree(n);
659                         return -EINVAL;
660                 }
661                 mark = RTA_DATA(tb[TCA_U32_MARK-1]);
662                 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
663                 n->mark.success = 0;
664         }
665 #endif
666
667         err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE-1]);
668         if (err == 0) {
669                 struct tc_u_knode **ins;
670                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
671                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
672                                 break;
673
674                 n->next = *ins;
675                 wmb();
676                 *ins = n;
677
678                 *arg = (unsigned long)n;
679                 return 0;
680         }
681 #ifdef CONFIG_CLS_U32_PERF
682         kfree(n->pf);
683 #endif
684         kfree(n);
685         return err;
686 }
687
688 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
689 {
690         struct tc_u_common *tp_c = tp->data;
691         struct tc_u_hnode *ht;
692         struct tc_u_knode *n;
693         unsigned h;
694
695         if (arg->stop)
696                 return;
697
698         for (ht = tp_c->hlist; ht; ht = ht->next) {
699                 if (ht->prio != tp->prio)
700                         continue;
701                 if (arg->count >= arg->skip) {
702                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
703                                 arg->stop = 1;
704                                 return;
705                         }
706                 }
707                 arg->count++;
708                 for (h = 0; h <= ht->divisor; h++) {
709                         for (n = ht->ht[h]; n; n = n->next) {
710                                 if (arg->count < arg->skip) {
711                                         arg->count++;
712                                         continue;
713                                 }
714                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
715                                         arg->stop = 1;
716                                         return;
717                                 }
718                                 arg->count++;
719                         }
720                 }
721         }
722 }
723
724 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
725                      struct sk_buff *skb, struct tcmsg *t)
726 {
727         struct tc_u_knode *n = (struct tc_u_knode*)fh;
728         unsigned char    *b = skb->tail;
729         struct rtattr *rta;
730
731         if (n == NULL)
732                 return skb->len;
733
734         t->tcm_handle = n->handle;
735
736         rta = (struct rtattr*)b;
737         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
738
739         if (TC_U32_KEY(n->handle) == 0) {
740                 struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
741                 u32 divisor = ht->divisor+1;
742                 RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor);
743         } else {
744                 RTA_PUT(skb, TCA_U32_SEL,
745                         sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
746                         &n->sel);
747                 if (n->ht_up) {
748                         u32 htid = n->handle & 0xFFFFF000;
749                         RTA_PUT(skb, TCA_U32_HASH, 4, &htid);
750                 }
751                 if (n->res.classid)
752                         RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid);
753                 if (n->ht_down)
754                         RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle);
755
756 #ifdef CONFIG_CLS_U32_MARK
757                 if (n->mark.val || n->mark.mask)
758                         RTA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
759 #endif
760
761                 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
762                         goto rtattr_failure;
763
764 #ifdef CONFIG_NET_CLS_IND
765                 if(strlen(n->indev))
766                         RTA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev);
767 #endif
768 #ifdef CONFIG_CLS_U32_PERF
769                 RTA_PUT(skb, TCA_U32_PCNT, 
770                 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
771                         n->pf);
772 #endif
773         }
774
775         rta->rta_len = skb->tail - b;
776         if (TC_U32_KEY(n->handle))
777                 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
778                         goto rtattr_failure;
779         return skb->len;
780
781 rtattr_failure:
782         skb_trim(skb, b - skb->data);
783         return -1;
784 }
785
786 static struct tcf_proto_ops cls_u32_ops = {
787         .next           =       NULL,
788         .kind           =       "u32",
789         .classify       =       u32_classify,
790         .init           =       u32_init,
791         .destroy        =       u32_destroy,
792         .get            =       u32_get,
793         .put            =       u32_put,
794         .change         =       u32_change,
795         .delete         =       u32_delete,
796         .walk           =       u32_walk,
797         .dump           =       u32_dump,
798         .owner          =       THIS_MODULE,
799 };
800
801 static int __init init_u32(void)
802 {
803         printk("u32 classifier\n");
804 #ifdef CONFIG_CLS_U32_PERF
805         printk("    Perfomance counters on\n");
806 #endif
807 #ifdef CONFIG_NET_CLS_POLICE
808         printk("    OLD policer on \n");
809 #endif
810 #ifdef CONFIG_NET_CLS_IND
811         printk("    input device check on \n");
812 #endif
813 #ifdef CONFIG_NET_CLS_ACT
814         printk("    Actions configured \n");
815 #endif
816         return register_tcf_proto_ops(&cls_u32_ops);
817 }
818
819 static void __exit exit_u32(void) 
820 {
821         unregister_tcf_proto_ops(&cls_u32_ops);
822 }
823
824 module_init(init_u32)
825 module_exit(exit_u32)
826 MODULE_LICENSE("GPL");