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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/percpu.h>
 40 #include <linux/rtnetlink.h>
 41 #include <linux/skbuff.h>
 42 #include <linux/bitmap.h>
 43 #include <net/netlink.h>
 44 #include <net/act_api.h>
 45 #include <net/pkt_cls.h>
 46 
 47 struct tc_u_knode {
 48         struct tc_u_knode __rcu *next;
 49         u32                     handle;
 50         struct tc_u_hnode __rcu *ht_up;
 51         struct tcf_exts         exts;
 52 #ifdef CONFIG_NET_CLS_IND
 53         int                     ifindex;
 54 #endif
 55         u8                      fshift;
 56         struct tcf_result       res;
 57         struct tc_u_hnode __rcu *ht_down;
 58 #ifdef CONFIG_CLS_U32_PERF
 59         struct tc_u32_pcnt __percpu *pf;
 60 #endif
 61 #ifdef CONFIG_CLS_U32_MARK
 62         u32                     val;
 63         u32                     mask;
 64         u32 __percpu            *pcpu_success;
 65 #endif
 66         struct tcf_proto        *tp;
 67         struct rcu_head         rcu;
 68         /* The 'sel' field MUST be the last field in structure to allow for
 69          * tc_u32_keys allocated at end of structure.
 70          */
 71         struct tc_u32_sel       sel;
 72 };
 73 
 74 struct tc_u_hnode {
 75         struct tc_u_hnode __rcu *next;
 76         u32                     handle;
 77         u32                     prio;
 78         struct tc_u_common      *tp_c;
 79         int                     refcnt;
 80         unsigned int            divisor;
 81         struct rcu_head         rcu;
 82         /* The 'ht' field MUST be the last field in structure to allow for
 83          * more entries allocated at end of structure.
 84          */
 85         struct tc_u_knode __rcu *ht[1];
 86 };
 87 
 88 struct tc_u_common {
 89         struct tc_u_hnode __rcu *hlist;
 90         struct Qdisc            *q;
 91         int                     refcnt;
 92         u32                     hgenerator;
 93         struct rcu_head         rcu;
 94 };
 95 
 96 static inline unsigned int u32_hash_fold(__be32 key,
 97                                          const struct tc_u32_sel *sel,
 98                                          u8 fshift)
 99 {
100         unsigned int h = ntohl(key & sel->hmask) >> fshift;
101 
102         return h;
103 }
104 
105 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res)
106 {
107         struct {
108                 struct tc_u_knode *knode;
109                 unsigned int      off;
110         } stack[TC_U32_MAXDEPTH];
111 
112         struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
113         unsigned int off = skb_network_offset(skb);
114         struct tc_u_knode *n;
115         int sdepth = 0;
116         int off2 = 0;
117         int sel = 0;
118 #ifdef CONFIG_CLS_U32_PERF
119         int j;
120 #endif
121         int i, r;
122 
123 next_ht:
124         n = rcu_dereference_bh(ht->ht[sel]);
125 
126 next_knode:
127         if (n) {
128                 struct tc_u32_key *key = n->sel.keys;
129 
130 #ifdef CONFIG_CLS_U32_PERF
131                 __this_cpu_inc(n->pf->rcnt);
132                 j = 0;
133 #endif
134 
135 #ifdef CONFIG_CLS_U32_MARK
136                 if ((skb->mark & n->mask) != n->val) {
137                         n = rcu_dereference_bh(n->next);
138                         goto next_knode;
139                 } else {
140                         __this_cpu_inc(*n->pcpu_success);
141                 }
142 #endif
143 
144                 for (i = n->sel.nkeys; i > 0; i--, key++) {
145                         int toff = off + key->off + (off2 & key->offmask);
146                         __be32 *data, hdata;
147 
148                         if (skb_headroom(skb) + toff > INT_MAX)
149                                 goto out;
150 
151                         data = skb_header_pointer(skb, toff, 4, &hdata);
152                         if (!data)
153                                 goto out;
154                         if ((*data ^ key->val) & key->mask) {
155                                 n = rcu_dereference_bh(n->next);
156                                 goto next_knode;
157                         }
158 #ifdef CONFIG_CLS_U32_PERF
159                         __this_cpu_inc(n->pf->kcnts[j]);
160                         j++;
161 #endif
162                 }
163 
164                 ht = rcu_dereference_bh(n->ht_down);
165                 if (!ht) {
166 check_terminal:
167                         if (n->sel.flags & TC_U32_TERMINAL) {
168 
169                                 *res = n->res;
170 #ifdef CONFIG_NET_CLS_IND
171                                 if (!tcf_match_indev(skb, n->ifindex)) {
172                                         n = rcu_dereference_bh(n->next);
173                                         goto next_knode;
174                                 }
175 #endif
176 #ifdef CONFIG_CLS_U32_PERF
177                                 __this_cpu_inc(n->pf->rhit);
178 #endif
179                                 r = tcf_exts_exec(skb, &n->exts, res);
180                                 if (r < 0) {
181                                         n = rcu_dereference_bh(n->next);
182                                         goto next_knode;
183                                 }
184 
185                                 return r;
186                         }
187                         n = rcu_dereference_bh(n->next);
188                         goto next_knode;
189                 }
190 
191                 /* PUSH */
192                 if (sdepth >= TC_U32_MAXDEPTH)
193                         goto deadloop;
194                 stack[sdepth].knode = n;
195                 stack[sdepth].off = off;
196                 sdepth++;
197 
198                 ht = rcu_dereference_bh(n->ht_down);
199                 sel = 0;
200                 if (ht->divisor) {
201                         __be32 *data, hdata;
202 
203                         data = skb_header_pointer(skb, off + n->sel.hoff, 4,
204                                                   &hdata);
205                         if (!data)
206                                 goto out;
207                         sel = ht->divisor & u32_hash_fold(*data, &n->sel,
208                                                           n->fshift);
209                 }
210                 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
211                         goto next_ht;
212 
213                 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
214                         off2 = n->sel.off + 3;
215                         if (n->sel.flags & TC_U32_VAROFFSET) {
216                                 __be16 *data, hdata;
217 
218                                 data = skb_header_pointer(skb,
219                                                           off + n->sel.offoff,
220                                                           2, &hdata);
221                                 if (!data)
222                                         goto out;
223                                 off2 += ntohs(n->sel.offmask & *data) >>
224                                         n->sel.offshift;
225                         }
226                         off2 &= ~3;
227                 }
228                 if (n->sel.flags & TC_U32_EAT) {
229                         off += off2;
230                         off2 = 0;
231                 }
232 
233                 if (off < skb->len)
234                         goto next_ht;
235         }
236 
237         /* POP */
238         if (sdepth--) {
239                 n = stack[sdepth].knode;
240                 ht = rcu_dereference_bh(n->ht_up);
241                 off = stack[sdepth].off;
242                 goto check_terminal;
243         }
244 out:
245         return -1;
246 
247 deadloop:
248         net_warn_ratelimited("cls_u32: dead loop\n");
249         return -1;
250 }
251 
252 static struct tc_u_hnode *
253 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
254 {
255         struct tc_u_hnode *ht;
256 
257         for (ht = rtnl_dereference(tp_c->hlist);
258              ht;
259              ht = rtnl_dereference(ht->next))
260                 if (ht->handle == handle)
261                         break;
262 
263         return ht;
264 }
265 
266 static struct tc_u_knode *
267 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
268 {
269         unsigned int sel;
270         struct tc_u_knode *n = NULL;
271 
272         sel = TC_U32_HASH(handle);
273         if (sel > ht->divisor)
274                 goto out;
275 
276         for (n = rtnl_dereference(ht->ht[sel]);
277              n;
278              n = rtnl_dereference(n->next))
279                 if (n->handle == handle)
280                         break;
281 out:
282         return n;
283 }
284 
285 
286 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
287 {
288         struct tc_u_hnode *ht;
289         struct tc_u_common *tp_c = tp->data;
290 
291         if (TC_U32_HTID(handle) == TC_U32_ROOT)
292                 ht = rtnl_dereference(tp->root);
293         else
294                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
295 
296         if (!ht)
297                 return 0;
298 
299         if (TC_U32_KEY(handle) == 0)
300                 return (unsigned long)ht;
301 
302         return (unsigned long)u32_lookup_key(ht, handle);
303 }
304 
305 static u32 gen_new_htid(struct tc_u_common *tp_c)
306 {
307         int i = 0x800;
308 
309         /* hgenerator only used inside rtnl lock it is safe to increment
310          * without read _copy_ update semantics
311          */
312         do {
313                 if (++tp_c->hgenerator == 0x7FF)
314                         tp_c->hgenerator = 1;
315         } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
316 
317         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
318 }
319 
320 static int u32_init(struct tcf_proto *tp)
321 {
322         struct tc_u_hnode *root_ht;
323         struct tc_u_common *tp_c;
324 
325         tp_c = tp->q->u32_node;
326 
327         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
328         if (root_ht == NULL)
329                 return -ENOBUFS;
330 
331         root_ht->divisor = 0;
332         root_ht->refcnt++;
333         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
334         root_ht->prio = tp->prio;
335 
336         if (tp_c == NULL) {
337                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
338                 if (tp_c == NULL) {
339                         kfree(root_ht);
340                         return -ENOBUFS;
341                 }
342                 tp_c->q = tp->q;
343                 tp->q->u32_node = tp_c;
344         }
345 
346         tp_c->refcnt++;
347         RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
348         rcu_assign_pointer(tp_c->hlist, root_ht);
349         root_ht->tp_c = tp_c;
350 
351         rcu_assign_pointer(tp->root, root_ht);
352         tp->data = tp_c;
353         return 0;
354 }
355 
356 static int u32_destroy_key(struct tcf_proto *tp,
357                            struct tc_u_knode *n,
358                            bool free_pf)
359 {
360         tcf_exts_destroy(&n->exts);
361         if (n->ht_down)
362                 n->ht_down->refcnt--;
363 #ifdef CONFIG_CLS_U32_PERF
364         if (free_pf)
365                 free_percpu(n->pf);
366 #endif
367 #ifdef CONFIG_CLS_U32_MARK
368         if (free_pf)
369                 free_percpu(n->pcpu_success);
370 #endif
371         kfree(n);
372         return 0;
373 }
374 
375 /* u32_delete_key_rcu should be called when free'ing a copied
376  * version of a tc_u_knode obtained from u32_init_knode(). When
377  * copies are obtained from u32_init_knode() the statistics are
378  * shared between the old and new copies to allow readers to
379  * continue to update the statistics during the copy. To support
380  * this the u32_delete_key_rcu variant does not free the percpu
381  * statistics.
382  */
383 static void u32_delete_key_rcu(struct rcu_head *rcu)
384 {
385         struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
386 
387         u32_destroy_key(key->tp, key, false);
388 }
389 
390 /* u32_delete_key_freepf_rcu is the rcu callback variant
391  * that free's the entire structure including the statistics
392  * percpu variables. Only use this if the key is not a copy
393  * returned by u32_init_knode(). See u32_delete_key_rcu()
394  * for the variant that should be used with keys return from
395  * u32_init_knode()
396  */
397 static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
398 {
399         struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
400 
401         u32_destroy_key(key->tp, key, true);
402 }
403 
404 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
405 {
406         struct tc_u_knode __rcu **kp;
407         struct tc_u_knode *pkp;
408         struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
409 
410         if (ht) {
411                 kp = &ht->ht[TC_U32_HASH(key->handle)];
412                 for (pkp = rtnl_dereference(*kp); pkp;
413                      kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
414                         if (pkp == key) {
415                                 RCU_INIT_POINTER(*kp, key->next);
416 
417                                 tcf_unbind_filter(tp, &key->res);
418                                 call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
419                                 return 0;
420                         }
421                 }
422         }
423         WARN_ON(1);
424         return 0;
425 }
426 
427 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
428 {
429         struct tc_u_knode *n;
430         unsigned int h;
431 
432         for (h = 0; h <= ht->divisor; h++) {
433                 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
434                         RCU_INIT_POINTER(ht->ht[h],
435                                          rtnl_dereference(n->next));
436                         tcf_unbind_filter(tp, &n->res);
437                         call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
438                 }
439         }
440 }
441 
442 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
443 {
444         struct tc_u_common *tp_c = tp->data;
445         struct tc_u_hnode __rcu **hn;
446         struct tc_u_hnode *phn;
447 
448         WARN_ON(ht->refcnt);
449 
450         u32_clear_hnode(tp, ht);
451 
452         hn = &tp_c->hlist;
453         for (phn = rtnl_dereference(*hn);
454              phn;
455              hn = &phn->next, phn = rtnl_dereference(*hn)) {
456                 if (phn == ht) {
457                         RCU_INIT_POINTER(*hn, ht->next);
458                         kfree_rcu(ht, rcu);
459                         return 0;
460                 }
461         }
462 
463         return -ENOENT;
464 }
465 
466 static bool ht_empty(struct tc_u_hnode *ht)
467 {
468         unsigned int h;
469 
470         for (h = 0; h <= ht->divisor; h++)
471                 if (rcu_access_pointer(ht->ht[h]))
472                         return false;
473 
474         return true;
475 }
476 
477 static bool u32_destroy(struct tcf_proto *tp, bool force)
478 {
479         struct tc_u_common *tp_c = tp->data;
480         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
481 
482         WARN_ON(root_ht == NULL);
483 
484         if (!force) {
485                 if (root_ht) {
486                         if (root_ht->refcnt > 1)
487                                 return false;
488                         if (root_ht->refcnt == 1) {
489                                 if (!ht_empty(root_ht))
490                                         return false;
491                         }
492                 }
493 
494                 if (tp_c->refcnt > 1)
495                         return false;
496 
497                 if (tp_c->refcnt == 1) {
498                         struct tc_u_hnode *ht;
499 
500                         for (ht = rtnl_dereference(tp_c->hlist);
501                              ht;
502                              ht = rtnl_dereference(ht->next))
503                                 if (!ht_empty(ht))
504                                         return false;
505                 }
506         }
507 
508         if (root_ht && --root_ht->refcnt == 0)
509                 u32_destroy_hnode(tp, root_ht);
510 
511         if (--tp_c->refcnt == 0) {
512                 struct tc_u_hnode *ht;
513 
514                 tp->q->u32_node = NULL;
515 
516                 for (ht = rtnl_dereference(tp_c->hlist);
517                      ht;
518                      ht = rtnl_dereference(ht->next)) {
519                         ht->refcnt--;
520                         u32_clear_hnode(tp, ht);
521                 }
522 
523                 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
524                         RCU_INIT_POINTER(tp_c->hlist, ht->next);
525                         kfree_rcu(ht, rcu);
526                 }
527 
528                 kfree(tp_c);
529         }
530 
531         tp->data = NULL;
532         return true;
533 }
534 
535 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
536 {
537         struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
538         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
539 
540         if (ht == NULL)
541                 return 0;
542 
543         if (TC_U32_KEY(ht->handle))
544                 return u32_delete_key(tp, (struct tc_u_knode *)ht);
545 
546         if (root_ht == ht)
547                 return -EINVAL;
548 
549         if (ht->refcnt == 1) {
550                 ht->refcnt--;
551                 u32_destroy_hnode(tp, ht);
552         } else {
553                 return -EBUSY;
554         }
555 
556         return 0;
557 }
558 
559 #define NR_U32_NODE (1<<12)
560 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
561 {
562         struct tc_u_knode *n;
563         unsigned long i;
564         unsigned long *bitmap = kzalloc(BITS_TO_LONGS(NR_U32_NODE) * sizeof(unsigned long),
565                                         GFP_KERNEL);
566         if (!bitmap)
567                 return handle | 0xFFF;
568 
569         for (n = rtnl_dereference(ht->ht[TC_U32_HASH(handle)]);
570              n;
571              n = rtnl_dereference(n->next))
572                 set_bit(TC_U32_NODE(n->handle), bitmap);
573 
574         i = find_next_zero_bit(bitmap, NR_U32_NODE, 0x800);
575         if (i >= NR_U32_NODE)
576                 i = find_next_zero_bit(bitmap, NR_U32_NODE, 1);
577 
578         kfree(bitmap);
579         return handle | (i >= NR_U32_NODE ? 0xFFF : i);
580 }
581 
582 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
583         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
584         [TCA_U32_HASH]          = { .type = NLA_U32 },
585         [TCA_U32_LINK]          = { .type = NLA_U32 },
586         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
587         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
588         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
589         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
590 };
591 
592 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
593                          unsigned long base, struct tc_u_hnode *ht,
594                          struct tc_u_knode *n, struct nlattr **tb,
595                          struct nlattr *est, bool ovr)
596 {
597         int err;
598         struct tcf_exts e;
599 
600         tcf_exts_init(&e, TCA_U32_ACT, TCA_U32_POLICE);
601         err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
602         if (err < 0)
603                 return err;
604 
605         err = -EINVAL;
606         if (tb[TCA_U32_LINK]) {
607                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
608                 struct tc_u_hnode *ht_down = NULL, *ht_old;
609 
610                 if (TC_U32_KEY(handle))
611                         goto errout;
612 
613                 if (handle) {
614                         ht_down = u32_lookup_ht(ht->tp_c, handle);
615 
616                         if (ht_down == NULL)
617                                 goto errout;
618                         ht_down->refcnt++;
619                 }
620 
621                 ht_old = rtnl_dereference(n->ht_down);
622                 rcu_assign_pointer(n->ht_down, ht_down);
623 
624                 if (ht_old)
625                         ht_old->refcnt--;
626         }
627         if (tb[TCA_U32_CLASSID]) {
628                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
629                 tcf_bind_filter(tp, &n->res, base);
630         }
631 
632 #ifdef CONFIG_NET_CLS_IND
633         if (tb[TCA_U32_INDEV]) {
634                 int ret;
635                 ret = tcf_change_indev(net, tb[TCA_U32_INDEV]);
636                 if (ret < 0)
637                         goto errout;
638                 n->ifindex = ret;
639         }
640 #endif
641         tcf_exts_change(tp, &n->exts, &e);
642 
643         return 0;
644 errout:
645         tcf_exts_destroy(&e);
646         return err;
647 }
648 
649 static void u32_replace_knode(struct tcf_proto *tp,
650                               struct tc_u_common *tp_c,
651                               struct tc_u_knode *n)
652 {
653         struct tc_u_knode __rcu **ins;
654         struct tc_u_knode *pins;
655         struct tc_u_hnode *ht;
656 
657         if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
658                 ht = rtnl_dereference(tp->root);
659         else
660                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
661 
662         ins = &ht->ht[TC_U32_HASH(n->handle)];
663 
664         /* The node must always exist for it to be replaced if this is not the
665          * case then something went very wrong elsewhere.
666          */
667         for (pins = rtnl_dereference(*ins); ;
668              ins = &pins->next, pins = rtnl_dereference(*ins))
669                 if (pins->handle == n->handle)
670                         break;
671 
672         RCU_INIT_POINTER(n->next, pins->next);
673         rcu_assign_pointer(*ins, n);
674 }
675 
676 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
677                                          struct tc_u_knode *n)
678 {
679         struct tc_u_knode *new;
680         struct tc_u32_sel *s = &n->sel;
681 
682         new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
683                       GFP_KERNEL);
684 
685         if (!new)
686                 return NULL;
687 
688         RCU_INIT_POINTER(new->next, n->next);
689         new->handle = n->handle;
690         RCU_INIT_POINTER(new->ht_up, n->ht_up);
691 
692 #ifdef CONFIG_NET_CLS_IND
693         new->ifindex = n->ifindex;
694 #endif
695         new->fshift = n->fshift;
696         new->res = n->res;
697         RCU_INIT_POINTER(new->ht_down, n->ht_down);
698 
699         /* bump reference count as long as we hold pointer to structure */
700         if (new->ht_down)
701                 new->ht_down->refcnt++;
702 
703 #ifdef CONFIG_CLS_U32_PERF
704         /* Statistics may be incremented by readers during update
705          * so we must keep them in tact. When the node is later destroyed
706          * a special destroy call must be made to not free the pf memory.
707          */
708         new->pf = n->pf;
709 #endif
710 
711 #ifdef CONFIG_CLS_U32_MARK
712         new->val = n->val;
713         new->mask = n->mask;
714         /* Similarly success statistics must be moved as pointers */
715         new->pcpu_success = n->pcpu_success;
716 #endif
717         new->tp = tp;
718         memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
719 
720         tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE);
721 
722         return new;
723 }
724 
725 static int u32_change(struct net *net, struct sk_buff *in_skb,
726                       struct tcf_proto *tp, unsigned long base, u32 handle,
727                       struct nlattr **tca,
728                       unsigned long *arg, bool ovr)
729 {
730         struct tc_u_common *tp_c = tp->data;
731         struct tc_u_hnode *ht;
732         struct tc_u_knode *n;
733         struct tc_u32_sel *s;
734         struct nlattr *opt = tca[TCA_OPTIONS];
735         struct nlattr *tb[TCA_U32_MAX + 1];
736         u32 htid;
737         int err;
738 #ifdef CONFIG_CLS_U32_PERF
739         size_t size;
740 #endif
741 
742         if (opt == NULL)
743                 return handle ? -EINVAL : 0;
744 
745         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
746         if (err < 0)
747                 return err;
748 
749         n = (struct tc_u_knode *)*arg;
750         if (n) {
751                 struct tc_u_knode *new;
752 
753                 if (TC_U32_KEY(n->handle) == 0)
754                         return -EINVAL;
755 
756                 new = u32_init_knode(tp, n);
757                 if (!new)
758                         return -ENOMEM;
759 
760                 err = u32_set_parms(net, tp, base,
761                                     rtnl_dereference(n->ht_up), new, tb,
762                                     tca[TCA_RATE], ovr);
763 
764                 if (err) {
765                         u32_destroy_key(tp, new, false);
766                         return err;
767                 }
768 
769                 u32_replace_knode(tp, tp_c, new);
770                 tcf_unbind_filter(tp, &n->res);
771                 call_rcu(&n->rcu, u32_delete_key_rcu);
772                 return 0;
773         }
774 
775         if (tb[TCA_U32_DIVISOR]) {
776                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
777 
778                 if (--divisor > 0x100)
779                         return -EINVAL;
780                 if (TC_U32_KEY(handle))
781                         return -EINVAL;
782                 if (handle == 0) {
783                         handle = gen_new_htid(tp->data);
784                         if (handle == 0)
785                                 return -ENOMEM;
786                 }
787                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
788                 if (ht == NULL)
789                         return -ENOBUFS;
790                 ht->tp_c = tp_c;
791                 ht->refcnt = 1;
792                 ht->divisor = divisor;
793                 ht->handle = handle;
794                 ht->prio = tp->prio;
795                 RCU_INIT_POINTER(ht->next, tp_c->hlist);
796                 rcu_assign_pointer(tp_c->hlist, ht);
797                 *arg = (unsigned long)ht;
798                 return 0;
799         }
800 
801         if (tb[TCA_U32_HASH]) {
802                 htid = nla_get_u32(tb[TCA_U32_HASH]);
803                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
804                         ht = rtnl_dereference(tp->root);
805                         htid = ht->handle;
806                 } else {
807                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
808                         if (ht == NULL)
809                                 return -EINVAL;
810                 }
811         } else {
812                 ht = rtnl_dereference(tp->root);
813                 htid = ht->handle;
814         }
815 
816         if (ht->divisor < TC_U32_HASH(htid))
817                 return -EINVAL;
818 
819         if (handle) {
820                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
821                         return -EINVAL;
822                 handle = htid | TC_U32_NODE(handle);
823         } else
824                 handle = gen_new_kid(ht, htid);
825 
826         if (tb[TCA_U32_SEL] == NULL)
827                 return -EINVAL;
828 
829         s = nla_data(tb[TCA_U32_SEL]);
830 
831         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
832         if (n == NULL)
833                 return -ENOBUFS;
834 
835 #ifdef CONFIG_CLS_U32_PERF
836         size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
837         n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
838         if (!n->pf) {
839                 kfree(n);
840                 return -ENOBUFS;
841         }
842 #endif
843 
844         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
845         RCU_INIT_POINTER(n->ht_up, ht);
846         n->handle = handle;
847         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
848         tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
849         n->tp = tp;
850 
851 #ifdef CONFIG_CLS_U32_MARK
852         n->pcpu_success = alloc_percpu(u32);
853         if (!n->pcpu_success) {
854                 err = -ENOMEM;
855                 goto errout;
856         }
857 
858         if (tb[TCA_U32_MARK]) {
859                 struct tc_u32_mark *mark;
860 
861                 mark = nla_data(tb[TCA_U32_MARK]);
862                 n->val = mark->val;
863                 n->mask = mark->mask;
864         }
865 #endif
866 
867         err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr);
868         if (err == 0) {
869                 struct tc_u_knode __rcu **ins;
870                 struct tc_u_knode *pins;
871 
872                 ins = &ht->ht[TC_U32_HASH(handle)];
873                 for (pins = rtnl_dereference(*ins); pins;
874                      ins = &pins->next, pins = rtnl_dereference(*ins))
875                         if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
876                                 break;
877 
878                 RCU_INIT_POINTER(n->next, pins);
879                 rcu_assign_pointer(*ins, n);
880 
881                 *arg = (unsigned long)n;
882                 return 0;
883         }
884 
885 #ifdef CONFIG_CLS_U32_MARK
886         free_percpu(n->pcpu_success);
887 errout:
888 #endif
889 
890 #ifdef CONFIG_CLS_U32_PERF
891         free_percpu(n->pf);
892 #endif
893         kfree(n);
894         return err;
895 }
896 
897 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
898 {
899         struct tc_u_common *tp_c = tp->data;
900         struct tc_u_hnode *ht;
901         struct tc_u_knode *n;
902         unsigned int h;
903 
904         if (arg->stop)
905                 return;
906 
907         for (ht = rtnl_dereference(tp_c->hlist);
908              ht;
909              ht = rtnl_dereference(ht->next)) {
910                 if (ht->prio != tp->prio)
911                         continue;
912                 if (arg->count >= arg->skip) {
913                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
914                                 arg->stop = 1;
915                                 return;
916                         }
917                 }
918                 arg->count++;
919                 for (h = 0; h <= ht->divisor; h++) {
920                         for (n = rtnl_dereference(ht->ht[h]);
921                              n;
922                              n = rtnl_dereference(n->next)) {
923                                 if (arg->count < arg->skip) {
924                                         arg->count++;
925                                         continue;
926                                 }
927                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
928                                         arg->stop = 1;
929                                         return;
930                                 }
931                                 arg->count++;
932                         }
933                 }
934         }
935 }
936 
937 static int u32_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
938                      struct sk_buff *skb, struct tcmsg *t)
939 {
940         struct tc_u_knode *n = (struct tc_u_knode *)fh;
941         struct tc_u_hnode *ht_up, *ht_down;
942         struct nlattr *nest;
943 
944         if (n == NULL)
945                 return skb->len;
946 
947         t->tcm_handle = n->handle;
948 
949         nest = nla_nest_start(skb, TCA_OPTIONS);
950         if (nest == NULL)
951                 goto nla_put_failure;
952 
953         if (TC_U32_KEY(n->handle) == 0) {
954                 struct tc_u_hnode *ht = (struct tc_u_hnode *)fh;
955                 u32 divisor = ht->divisor + 1;
956 
957                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
958                         goto nla_put_failure;
959         } else {
960 #ifdef CONFIG_CLS_U32_PERF
961                 struct tc_u32_pcnt *gpf;
962                 int cpu;
963 #endif
964 
965                 if (nla_put(skb, TCA_U32_SEL,
966                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
967                             &n->sel))
968                         goto nla_put_failure;
969 
970                 ht_up = rtnl_dereference(n->ht_up);
971                 if (ht_up) {
972                         u32 htid = n->handle & 0xFFFFF000;
973                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
974                                 goto nla_put_failure;
975                 }
976                 if (n->res.classid &&
977                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
978                         goto nla_put_failure;
979 
980                 ht_down = rtnl_dereference(n->ht_down);
981                 if (ht_down &&
982                     nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
983                         goto nla_put_failure;
984 
985 #ifdef CONFIG_CLS_U32_MARK
986                 if ((n->val || n->mask)) {
987                         struct tc_u32_mark mark = {.val = n->val,
988                                                    .mask = n->mask,
989                                                    .success = 0};
990                         int cpum;
991 
992                         for_each_possible_cpu(cpum) {
993                                 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
994 
995                                 mark.success += cnt;
996                         }
997 
998                         if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
999                                 goto nla_put_failure;
1000                 }
1001 #endif
1002 
1003                 if (tcf_exts_dump(skb, &n->exts) < 0)
1004                         goto nla_put_failure;
1005 
1006 #ifdef CONFIG_NET_CLS_IND
1007                 if (n->ifindex) {
1008                         struct net_device *dev;
1009                         dev = __dev_get_by_index(net, n->ifindex);
1010                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1011                                 goto nla_put_failure;
1012                 }
1013 #endif
1014 #ifdef CONFIG_CLS_U32_PERF
1015                 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1016                               n->sel.nkeys * sizeof(u64),
1017                               GFP_KERNEL);
1018                 if (!gpf)
1019                         goto nla_put_failure;
1020 
1021                 for_each_possible_cpu(cpu) {
1022                         int i;
1023                         struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1024 
1025                         gpf->rcnt += pf->rcnt;
1026                         gpf->rhit += pf->rhit;
1027                         for (i = 0; i < n->sel.nkeys; i++)
1028                                 gpf->kcnts[i] += pf->kcnts[i];
1029                 }
1030 
1031                 if (nla_put(skb, TCA_U32_PCNT,
1032                             sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
1033                             gpf)) {
1034                         kfree(gpf);
1035                         goto nla_put_failure;
1036                 }
1037                 kfree(gpf);
1038 #endif
1039         }
1040 
1041         nla_nest_end(skb, nest);
1042 
1043         if (TC_U32_KEY(n->handle))
1044                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1045                         goto nla_put_failure;
1046         return skb->len;
1047 
1048 nla_put_failure:
1049         nla_nest_cancel(skb, nest);
1050         return -1;
1051 }
1052 
1053 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1054         .kind           =       "u32",
1055         .classify       =       u32_classify,
1056         .init           =       u32_init,
1057         .destroy        =       u32_destroy,
1058         .get            =       u32_get,
1059         .change         =       u32_change,
1060         .delete         =       u32_delete,
1061         .walk           =       u32_walk,
1062         .dump           =       u32_dump,
1063         .owner          =       THIS_MODULE,
1064 };
1065 
1066 static int __init init_u32(void)
1067 {
1068         pr_info("u32 classifier\n");
1069 #ifdef CONFIG_CLS_U32_PERF
1070         pr_info("    Performance counters on\n");
1071 #endif
1072 #ifdef CONFIG_NET_CLS_IND
1073         pr_info("    input device check on\n");
1074 #endif
1075 #ifdef CONFIG_NET_CLS_ACT
1076         pr_info("    Actions configured\n");
1077 #endif
1078         return register_tcf_proto_ops(&cls_u32_ops);
1079 }
1080 
1081 static void __exit exit_u32(void)
1082 {
1083         unregister_tcf_proto_ops(&cls_u32_ops);
1084 }
1085 
1086 module_init(init_u32)
1087 module_exit(exit_u32)
1088 MODULE_LICENSE("GPL");
1089 

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