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TOMOYO Linux Cross Reference
Linux/net/sched/cls_u32.c

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  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/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 
 45 struct tc_u_knode {
 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         struct tc_u_hnode       *next;
 67         u32                     handle;
 68         u32                     prio;
 69         struct tc_u_common      *tp_c;
 70         int                     refcnt;
 71         unsigned int            divisor;
 72         struct tc_u_knode       *ht[1];
 73 };
 74 
 75 struct tc_u_common {
 76         struct tc_u_hnode       *hlist;
 77         struct Qdisc            *q;
 78         int                     refcnt;
 79         u32                     hgenerator;
 80 };
 81 
 82 static const struct tcf_ext_map u32_ext_map = {
 83         .action = TCA_U32_ACT,
 84         .police = TCA_U32_POLICE
 85 };
 86 
 87 static inline unsigned int u32_hash_fold(__be32 key,
 88                                          const struct tc_u32_sel *sel,
 89                                          u8 fshift)
 90 {
 91         unsigned int h = ntohl(key & sel->hmask) >> fshift;
 92 
 93         return h;
 94 }
 95 
 96 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res)
 97 {
 98         struct {
 99                 struct tc_u_knode *knode;
100                 unsigned int      off;
101         } stack[TC_U32_MAXDEPTH];
102 
103         struct tc_u_hnode *ht = (struct tc_u_hnode *)tp->root;
104         unsigned int off = skb_network_offset(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                         int toff = off + key->off + (off2 & key->offmask);
137                         __be32 *data, hdata;
138 
139                         if (skb_headroom(skb) + toff > INT_MAX)
140                                 goto out;
141 
142                         data = skb_header_pointer(skb, toff, 4, &hdata);
143                         if (!data)
144                                 goto out;
145                         if ((*data ^ key->val) & key->mask) {
146                                 n = n->next;
147                                 goto next_knode;
148                         }
149 #ifdef CONFIG_CLS_U32_PERF
150                         n->pf->kcnts[j] += 1;
151                         j++;
152 #endif
153                 }
154                 if (n->ht_down == NULL) {
155 check_terminal:
156                         if (n->sel.flags & TC_U32_TERMINAL) {
157 
158                                 *res = n->res;
159 #ifdef CONFIG_NET_CLS_IND
160                                 if (!tcf_match_indev(skb, n->indev)) {
161                                         n = n->next;
162                                         goto next_knode;
163                                 }
164 #endif
165 #ifdef CONFIG_CLS_U32_PERF
166                                 n->pf->rhit += 1;
167 #endif
168                                 r = tcf_exts_exec(skb, &n->exts, res);
169                                 if (r < 0) {
170                                         n = n->next;
171                                         goto next_knode;
172                                 }
173 
174                                 return r;
175                         }
176                         n = n->next;
177                         goto next_knode;
178                 }
179 
180                 /* PUSH */
181                 if (sdepth >= TC_U32_MAXDEPTH)
182                         goto deadloop;
183                 stack[sdepth].knode = n;
184                 stack[sdepth].off = off;
185                 sdepth++;
186 
187                 ht = n->ht_down;
188                 sel = 0;
189                 if (ht->divisor) {
190                         __be32 *data, hdata;
191 
192                         data = skb_header_pointer(skb, off + n->sel.hoff, 4,
193                                                   &hdata);
194                         if (!data)
195                                 goto out;
196                         sel = ht->divisor & u32_hash_fold(*data, &n->sel,
197                                                           n->fshift);
198                 }
199                 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
200                         goto next_ht;
201 
202                 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
203                         off2 = n->sel.off + 3;
204                         if (n->sel.flags & TC_U32_VAROFFSET) {
205                                 __be16 *data, hdata;
206 
207                                 data = skb_header_pointer(skb,
208                                                           off + n->sel.offoff,
209                                                           2, &hdata);
210                                 if (!data)
211                                         goto out;
212                                 off2 += ntohs(n->sel.offmask & *data) >>
213                                         n->sel.offshift;
214                         }
215                         off2 &= ~3;
216                 }
217                 if (n->sel.flags & TC_U32_EAT) {
218                         off += off2;
219                         off2 = 0;
220                 }
221 
222                 if (off < skb->len)
223                         goto next_ht;
224         }
225 
226         /* POP */
227         if (sdepth--) {
228                 n = stack[sdepth].knode;
229                 ht = n->ht_up;
230                 off = stack[sdepth].off;
231                 goto check_terminal;
232         }
233 out:
234         return -1;
235 
236 deadloop:
237         if (net_ratelimit())
238                 pr_warning("cls_u32: dead loop\n");
239         return -1;
240 }
241 
242 static struct tc_u_hnode *
243 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
244 {
245         struct tc_u_hnode *ht;
246 
247         for (ht = tp_c->hlist; ht; ht = ht->next)
248                 if (ht->handle == handle)
249                         break;
250 
251         return ht;
252 }
253 
254 static struct tc_u_knode *
255 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
256 {
257         unsigned int sel;
258         struct tc_u_knode *n = NULL;
259 
260         sel = TC_U32_HASH(handle);
261         if (sel > ht->divisor)
262                 goto out;
263 
264         for (n = ht->ht[sel]; n; n = n->next)
265                 if (n->handle == handle)
266                         break;
267 out:
268         return n;
269 }
270 
271 
272 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
273 {
274         struct tc_u_hnode *ht;
275         struct tc_u_common *tp_c = tp->data;
276 
277         if (TC_U32_HTID(handle) == TC_U32_ROOT)
278                 ht = tp->root;
279         else
280                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
281 
282         if (!ht)
283                 return 0;
284 
285         if (TC_U32_KEY(handle) == 0)
286                 return (unsigned long)ht;
287 
288         return (unsigned long)u32_lookup_key(ht, handle);
289 }
290 
291 static void u32_put(struct tcf_proto *tp, unsigned long f)
292 {
293 }
294 
295 static u32 gen_new_htid(struct tc_u_common *tp_c)
296 {
297         int i = 0x800;
298 
299         do {
300                 if (++tp_c->hgenerator == 0x7FF)
301                         tp_c->hgenerator = 1;
302         } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
303 
304         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
305 }
306 
307 static int u32_init(struct tcf_proto *tp)
308 {
309         struct tc_u_hnode *root_ht;
310         struct tc_u_common *tp_c;
311 
312         tp_c = tp->q->u32_node;
313 
314         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
315         if (root_ht == NULL)
316                 return -ENOBUFS;
317 
318         root_ht->divisor = 0;
319         root_ht->refcnt++;
320         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
321         root_ht->prio = tp->prio;
322 
323         if (tp_c == NULL) {
324                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
325                 if (tp_c == NULL) {
326                         kfree(root_ht);
327                         return -ENOBUFS;
328                 }
329                 tp_c->q = tp->q;
330                 tp->q->u32_node = 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         WARN_ON(1);
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 int 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         WARN_ON(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         WARN_ON(1);
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 = tp->root;
416 
417         WARN_ON(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 
425                 tp->q->u32_node = NULL;
426 
427                 for (ht = tp_c->hlist; ht; ht = ht->next) {
428                         ht->refcnt--;
429                         u32_clear_hnode(tp, ht);
430                 }
431 
432                 while ((ht = tp_c->hlist) != NULL) {
433                         tp_c->hlist = ht->next;
434 
435                         WARN_ON(ht->refcnt != 0);
436 
437                         kfree(ht);
438                 }
439 
440                 kfree(tp_c);
441         }
442 
443         tp->data = NULL;
444 }
445 
446 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
447 {
448         struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
449 
450         if (ht == NULL)
451                 return 0;
452 
453         if (TC_U32_KEY(ht->handle))
454                 return u32_delete_key(tp, (struct tc_u_knode *)ht);
455 
456         if (tp->root == ht)
457                 return -EINVAL;
458 
459         if (ht->refcnt == 1) {
460                 ht->refcnt--;
461                 u32_destroy_hnode(tp, ht);
462         } else {
463                 return -EBUSY;
464         }
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 int 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 const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
483         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
484         [TCA_U32_HASH]          = { .type = NLA_U32 },
485         [TCA_U32_LINK]          = { .type = NLA_U32 },
486         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
487         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
488         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
489         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
490 };
491 
492 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
493                          struct tc_u_hnode *ht,
494                          struct tc_u_knode *n, struct nlattr **tb,
495                          struct nlattr *est)
496 {
497         int err;
498         struct tcf_exts e;
499 
500         err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
501         if (err < 0)
502                 return err;
503 
504         err = -EINVAL;
505         if (tb[TCA_U32_LINK]) {
506                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
507                 struct tc_u_hnode *ht_down = NULL, *ht_old;
508 
509                 if (TC_U32_KEY(handle))
510                         goto errout;
511 
512                 if (handle) {
513                         ht_down = u32_lookup_ht(ht->tp_c, handle);
514 
515                         if (ht_down == NULL)
516                                 goto errout;
517                         ht_down->refcnt++;
518                 }
519 
520                 tcf_tree_lock(tp);
521                 ht_old = n->ht_down;
522                 n->ht_down = ht_down;
523                 tcf_tree_unlock(tp);
524 
525                 if (ht_old)
526                         ht_old->refcnt--;
527         }
528         if (tb[TCA_U32_CLASSID]) {
529                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
530                 tcf_bind_filter(tp, &n->res, base);
531         }
532 
533 #ifdef CONFIG_NET_CLS_IND
534         if (tb[TCA_U32_INDEV]) {
535                 err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
536                 if (err < 0)
537                         goto errout;
538         }
539 #endif
540         tcf_exts_change(tp, &n->exts, &e);
541 
542         return 0;
543 errout:
544         tcf_exts_destroy(tp, &e);
545         return err;
546 }
547 
548 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
549                       struct nlattr **tca,
550                       unsigned long *arg)
551 {
552         struct tc_u_common *tp_c = tp->data;
553         struct tc_u_hnode *ht;
554         struct tc_u_knode *n;
555         struct tc_u32_sel *s;
556         struct nlattr *opt = tca[TCA_OPTIONS];
557         struct nlattr *tb[TCA_U32_MAX + 1];
558         u32 htid;
559         int err;
560 
561         if (opt == NULL)
562                 return handle ? -EINVAL : 0;
563 
564         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
565         if (err < 0)
566                 return err;
567 
568         n = (struct tc_u_knode *)*arg;
569         if (n) {
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 int 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 
681 static 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 int 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 
717 static 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 
736                 NLA_PUT_U32(skb, TCA_U32_DIVISOR, divisor);
737         } else {
738                 NLA_PUT(skb, TCA_U32_SEL,
739                         sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
740                         &n->sel);
741                 if (n->ht_up) {
742                         u32 htid = n->handle & 0xFFFFF000;
743                         NLA_PUT_U32(skb, TCA_U32_HASH, htid);
744                 }
745                 if (n->res.classid)
746                         NLA_PUT_U32(skb, TCA_U32_CLASSID, n->res.classid);
747                 if (n->ht_down)
748                         NLA_PUT_U32(skb, TCA_U32_LINK, n->ht_down->handle);
749 
750 #ifdef CONFIG_CLS_U32_MARK
751                 if (n->mark.val || n->mark.mask)
752                         NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
753 #endif
754 
755                 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
756                         goto nla_put_failure;
757 
758 #ifdef CONFIG_NET_CLS_IND
759                 if (strlen(n->indev))
760                         NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev);
761 #endif
762 #ifdef CONFIG_CLS_U32_PERF
763                 NLA_PUT(skb, TCA_U32_PCNT,
764                 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
765                         n->pf);
766 #endif
767         }
768 
769         nla_nest_end(skb, nest);
770 
771         if (TC_U32_KEY(n->handle))
772                 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
773                         goto nla_put_failure;
774         return skb->len;
775 
776 nla_put_failure:
777         nla_nest_cancel(skb, nest);
778         return -1;
779 }
780 
781 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
782         .kind           =       "u32",
783         .classify       =       u32_classify,
784         .init           =       u32_init,
785         .destroy        =       u32_destroy,
786         .get            =       u32_get,
787         .put            =       u32_put,
788         .change         =       u32_change,
789         .delete         =       u32_delete,
790         .walk           =       u32_walk,
791         .dump           =       u32_dump,
792         .owner          =       THIS_MODULE,
793 };
794 
795 static int __init init_u32(void)
796 {
797         pr_info("u32 classifier\n");
798 #ifdef CONFIG_CLS_U32_PERF
799         pr_info("    Performance counters on\n");
800 #endif
801 #ifdef CONFIG_NET_CLS_IND
802         pr_info("    input device check on\n");
803 #endif
804 #ifdef CONFIG_NET_CLS_ACT
805         pr_info("    Actions configured\n");
806 #endif
807         return register_tcf_proto_ops(&cls_u32_ops);
808 }
809 
810 static void __exit exit_u32(void)
811 {
812         unregister_tcf_proto_ops(&cls_u32_ops);
813 }
814 
815 module_init(init_u32)
816 module_exit(exit_u32)
817 MODULE_LICENSE("GPL");
818 

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