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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         net_warn_ratelimited("cls_u32: dead loop\n");
238         return -1;
239 }
240 
241 static struct tc_u_hnode *
242 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
243 {
244         struct tc_u_hnode *ht;
245 
246         for (ht = tp_c->hlist; ht; ht = ht->next)
247                 if (ht->handle == handle)
248                         break;
249 
250         return ht;
251 }
252 
253 static struct tc_u_knode *
254 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
255 {
256         unsigned int sel;
257         struct tc_u_knode *n = NULL;
258 
259         sel = TC_U32_HASH(handle);
260         if (sel > ht->divisor)
261                 goto out;
262 
263         for (n = ht->ht[sel]; n; n = n->next)
264                 if (n->handle == handle)
265                         break;
266 out:
267         return n;
268 }
269 
270 
271 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
272 {
273         struct tc_u_hnode *ht;
274         struct tc_u_common *tp_c = tp->data;
275 
276         if (TC_U32_HTID(handle) == TC_U32_ROOT)
277                 ht = tp->root;
278         else
279                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
280 
281         if (!ht)
282                 return 0;
283 
284         if (TC_U32_KEY(handle) == 0)
285                 return (unsigned long)ht;
286 
287         return (unsigned long)u32_lookup_key(ht, handle);
288 }
289 
290 static void u32_put(struct tcf_proto *tp, unsigned long f)
291 {
292 }
293 
294 static u32 gen_new_htid(struct tc_u_common *tp_c)
295 {
296         int i = 0x800;
297 
298         do {
299                 if (++tp_c->hgenerator == 0x7FF)
300                         tp_c->hgenerator = 1;
301         } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
302 
303         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
304 }
305 
306 static int u32_init(struct tcf_proto *tp)
307 {
308         struct tc_u_hnode *root_ht;
309         struct tc_u_common *tp_c;
310 
311         tp_c = tp->q->u32_node;
312 
313         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
314         if (root_ht == NULL)
315                 return -ENOBUFS;
316 
317         root_ht->divisor = 0;
318         root_ht->refcnt++;
319         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
320         root_ht->prio = tp->prio;
321 
322         if (tp_c == NULL) {
323                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
324                 if (tp_c == NULL) {
325                         kfree(root_ht);
326                         return -ENOBUFS;
327                 }
328                 tp_c->q = tp->q;
329                 tp->q->u32_node = tp_c;
330         }
331 
332         tp_c->refcnt++;
333         root_ht->next = tp_c->hlist;
334         tp_c->hlist = root_ht;
335         root_ht->tp_c = tp_c;
336 
337         tp->root = root_ht;
338         tp->data = tp_c;
339         return 0;
340 }
341 
342 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
343 {
344         tcf_unbind_filter(tp, &n->res);
345         tcf_exts_destroy(tp, &n->exts);
346         if (n->ht_down)
347                 n->ht_down->refcnt--;
348 #ifdef CONFIG_CLS_U32_PERF
349         kfree(n->pf);
350 #endif
351         kfree(n);
352         return 0;
353 }
354 
355 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
356 {
357         struct tc_u_knode **kp;
358         struct tc_u_hnode *ht = key->ht_up;
359 
360         if (ht) {
361                 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
362                         if (*kp == key) {
363                                 tcf_tree_lock(tp);
364                                 *kp = key->next;
365                                 tcf_tree_unlock(tp);
366 
367                                 u32_destroy_key(tp, key);
368                                 return 0;
369                         }
370                 }
371         }
372         WARN_ON(1);
373         return 0;
374 }
375 
376 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
377 {
378         struct tc_u_knode *n;
379         unsigned int h;
380 
381         for (h = 0; h <= ht->divisor; h++) {
382                 while ((n = ht->ht[h]) != NULL) {
383                         ht->ht[h] = n->next;
384 
385                         u32_destroy_key(tp, n);
386                 }
387         }
388 }
389 
390 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
391 {
392         struct tc_u_common *tp_c = tp->data;
393         struct tc_u_hnode **hn;
394 
395         WARN_ON(ht->refcnt);
396 
397         u32_clear_hnode(tp, ht);
398 
399         for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
400                 if (*hn == ht) {
401                         *hn = ht->next;
402                         kfree(ht);
403                         return 0;
404                 }
405         }
406 
407         WARN_ON(1);
408         return -ENOENT;
409 }
410 
411 static void u32_destroy(struct tcf_proto *tp)
412 {
413         struct tc_u_common *tp_c = tp->data;
414         struct tc_u_hnode *root_ht = tp->root;
415 
416         WARN_ON(root_ht == NULL);
417 
418         if (root_ht && --root_ht->refcnt == 0)
419                 u32_destroy_hnode(tp, root_ht);
420 
421         if (--tp_c->refcnt == 0) {
422                 struct tc_u_hnode *ht;
423 
424                 tp->q->u32_node = NULL;
425 
426                 for (ht = tp_c->hlist; ht; ht = ht->next) {
427                         ht->refcnt--;
428                         u32_clear_hnode(tp, ht);
429                 }
430 
431                 while ((ht = tp_c->hlist) != NULL) {
432                         tp_c->hlist = ht->next;
433 
434                         WARN_ON(ht->refcnt != 0);
435 
436                         kfree(ht);
437                 }
438 
439                 kfree(tp_c);
440         }
441 
442         tp->data = NULL;
443 }
444 
445 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
446 {
447         struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
448 
449         if (ht == NULL)
450                 return 0;
451 
452         if (TC_U32_KEY(ht->handle))
453                 return u32_delete_key(tp, (struct tc_u_knode *)ht);
454 
455         if (tp->root == ht)
456                 return -EINVAL;
457 
458         if (ht->refcnt == 1) {
459                 ht->refcnt--;
460                 u32_destroy_hnode(tp, ht);
461         } else {
462                 return -EBUSY;
463         }
464 
465         return 0;
466 }
467 
468 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
469 {
470         struct tc_u_knode *n;
471         unsigned int i = 0x7FF;
472 
473         for (n = ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
474                 if (i < TC_U32_NODE(n->handle))
475                         i = TC_U32_NODE(n->handle);
476         i++;
477 
478         return handle | (i > 0xFFF ? 0xFFF : i);
479 }
480 
481 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
482         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
483         [TCA_U32_HASH]          = { .type = NLA_U32 },
484         [TCA_U32_LINK]          = { .type = NLA_U32 },
485         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
486         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
487         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
488         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
489 };
490 
491 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
492                          unsigned long base, struct tc_u_hnode *ht,
493                          struct tc_u_knode *n, struct nlattr **tb,
494                          struct nlattr *est)
495 {
496         int err;
497         struct tcf_exts e;
498 
499         err = tcf_exts_validate(net, tp, tb, est, &e, &u32_ext_map);
500         if (err < 0)
501                 return err;
502 
503         err = -EINVAL;
504         if (tb[TCA_U32_LINK]) {
505                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
506                 struct tc_u_hnode *ht_down = NULL, *ht_old;
507 
508                 if (TC_U32_KEY(handle))
509                         goto errout;
510 
511                 if (handle) {
512                         ht_down = u32_lookup_ht(ht->tp_c, handle);
513 
514                         if (ht_down == NULL)
515                                 goto errout;
516                         ht_down->refcnt++;
517                 }
518 
519                 tcf_tree_lock(tp);
520                 ht_old = n->ht_down;
521                 n->ht_down = ht_down;
522                 tcf_tree_unlock(tp);
523 
524                 if (ht_old)
525                         ht_old->refcnt--;
526         }
527         if (tb[TCA_U32_CLASSID]) {
528                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
529                 tcf_bind_filter(tp, &n->res, base);
530         }
531 
532 #ifdef CONFIG_NET_CLS_IND
533         if (tb[TCA_U32_INDEV]) {
534                 err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
535                 if (err < 0)
536                         goto errout;
537         }
538 #endif
539         tcf_exts_change(tp, &n->exts, &e);
540 
541         return 0;
542 errout:
543         tcf_exts_destroy(tp, &e);
544         return err;
545 }
546 
547 static int u32_change(struct net *net, struct sk_buff *in_skb,
548                       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(net, tp, base, n->ht_up, n, tb,
574                                      tca[TCA_RATE]);
575         }
576 
577         if (tb[TCA_U32_DIVISOR]) {
578                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
579 
580                 if (--divisor > 0x100)
581                         return -EINVAL;
582                 if (TC_U32_KEY(handle))
583                         return -EINVAL;
584                 if (handle == 0) {
585                         handle = gen_new_htid(tp->data);
586                         if (handle == 0)
587                                 return -ENOMEM;
588                 }
589                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
590                 if (ht == NULL)
591                         return -ENOBUFS;
592                 ht->tp_c = tp_c;
593                 ht->refcnt = 1;
594                 ht->divisor = divisor;
595                 ht->handle = handle;
596                 ht->prio = tp->prio;
597                 ht->next = tp_c->hlist;
598                 tp_c->hlist = ht;
599                 *arg = (unsigned long)ht;
600                 return 0;
601         }
602 
603         if (tb[TCA_U32_HASH]) {
604                 htid = nla_get_u32(tb[TCA_U32_HASH]);
605                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
606                         ht = tp->root;
607                         htid = ht->handle;
608                 } else {
609                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
610                         if (ht == NULL)
611                                 return -EINVAL;
612                 }
613         } else {
614                 ht = tp->root;
615                 htid = ht->handle;
616         }
617 
618         if (ht->divisor < TC_U32_HASH(htid))
619                 return -EINVAL;
620 
621         if (handle) {
622                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
623                         return -EINVAL;
624                 handle = htid | TC_U32_NODE(handle);
625         } else
626                 handle = gen_new_kid(ht, htid);
627 
628         if (tb[TCA_U32_SEL] == NULL)
629                 return -EINVAL;
630 
631         s = nla_data(tb[TCA_U32_SEL]);
632 
633         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
634         if (n == NULL)
635                 return -ENOBUFS;
636 
637 #ifdef CONFIG_CLS_U32_PERF
638         n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
639         if (n->pf == NULL) {
640                 kfree(n);
641                 return -ENOBUFS;
642         }
643 #endif
644 
645         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
646         n->ht_up = ht;
647         n->handle = handle;
648         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
649 
650 #ifdef CONFIG_CLS_U32_MARK
651         if (tb[TCA_U32_MARK]) {
652                 struct tc_u32_mark *mark;
653 
654                 mark = nla_data(tb[TCA_U32_MARK]);
655                 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
656                 n->mark.success = 0;
657         }
658 #endif
659 
660         err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE]);
661         if (err == 0) {
662                 struct tc_u_knode **ins;
663                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
664                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
665                                 break;
666 
667                 n->next = *ins;
668                 tcf_tree_lock(tp);
669                 *ins = n;
670                 tcf_tree_unlock(tp);
671 
672                 *arg = (unsigned long)n;
673                 return 0;
674         }
675 #ifdef CONFIG_CLS_U32_PERF
676         kfree(n->pf);
677 #endif
678         kfree(n);
679         return err;
680 }
681 
682 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
683 {
684         struct tc_u_common *tp_c = tp->data;
685         struct tc_u_hnode *ht;
686         struct tc_u_knode *n;
687         unsigned int h;
688 
689         if (arg->stop)
690                 return;
691 
692         for (ht = tp_c->hlist; ht; ht = ht->next) {
693                 if (ht->prio != tp->prio)
694                         continue;
695                 if (arg->count >= arg->skip) {
696                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
697                                 arg->stop = 1;
698                                 return;
699                         }
700                 }
701                 arg->count++;
702                 for (h = 0; h <= ht->divisor; h++) {
703                         for (n = ht->ht[h]; n; n = n->next) {
704                                 if (arg->count < arg->skip) {
705                                         arg->count++;
706                                         continue;
707                                 }
708                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
709                                         arg->stop = 1;
710                                         return;
711                                 }
712                                 arg->count++;
713                         }
714                 }
715         }
716 }
717 
718 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
719                      struct sk_buff *skb, struct tcmsg *t)
720 {
721         struct tc_u_knode *n = (struct tc_u_knode *)fh;
722         struct nlattr *nest;
723 
724         if (n == NULL)
725                 return skb->len;
726 
727         t->tcm_handle = n->handle;
728 
729         nest = nla_nest_start(skb, TCA_OPTIONS);
730         if (nest == NULL)
731                 goto nla_put_failure;
732 
733         if (TC_U32_KEY(n->handle) == 0) {
734                 struct tc_u_hnode *ht = (struct tc_u_hnode *)fh;
735                 u32 divisor = ht->divisor + 1;
736 
737                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
738                         goto nla_put_failure;
739         } else {
740                 if (nla_put(skb, TCA_U32_SEL,
741                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
742                             &n->sel))
743                         goto nla_put_failure;
744                 if (n->ht_up) {
745                         u32 htid = n->handle & 0xFFFFF000;
746                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
747                                 goto nla_put_failure;
748                 }
749                 if (n->res.classid &&
750                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
751                         goto nla_put_failure;
752                 if (n->ht_down &&
753                     nla_put_u32(skb, TCA_U32_LINK, n->ht_down->handle))
754                         goto nla_put_failure;
755 
756 #ifdef CONFIG_CLS_U32_MARK
757                 if ((n->mark.val || n->mark.mask) &&
758                     nla_put(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark))
759                         goto nla_put_failure;
760 #endif
761 
762                 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
763                         goto nla_put_failure;
764 
765 #ifdef CONFIG_NET_CLS_IND
766                 if (strlen(n->indev) &&
767                     nla_put_string(skb, TCA_U32_INDEV, n->indev))
768                         goto nla_put_failure;
769 #endif
770 #ifdef CONFIG_CLS_U32_PERF
771                 if (nla_put(skb, TCA_U32_PCNT,
772                             sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
773                             n->pf))
774                         goto nla_put_failure;
775 #endif
776         }
777 
778         nla_nest_end(skb, nest);
779 
780         if (TC_U32_KEY(n->handle))
781                 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
782                         goto nla_put_failure;
783         return skb->len;
784 
785 nla_put_failure:
786         nla_nest_cancel(skb, nest);
787         return -1;
788 }
789 
790 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
791         .kind           =       "u32",
792         .classify       =       u32_classify,
793         .init           =       u32_init,
794         .destroy        =       u32_destroy,
795         .get            =       u32_get,
796         .put            =       u32_put,
797         .change         =       u32_change,
798         .delete         =       u32_delete,
799         .walk           =       u32_walk,
800         .dump           =       u32_dump,
801         .owner          =       THIS_MODULE,
802 };
803 
804 static int __init init_u32(void)
805 {
806         pr_info("u32 classifier\n");
807 #ifdef CONFIG_CLS_U32_PERF
808         pr_info("    Performance counters on\n");
809 #endif
810 #ifdef CONFIG_NET_CLS_IND
811         pr_info("    input device check on\n");
812 #endif
813 #ifdef CONFIG_NET_CLS_ACT
814         pr_info("    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");
827 

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