Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[sfrench/cifs-2.6.git] / net / sched / cls_u32.c
1 /*
2  * net/sched/cls_u32.c  Ugly (or Universal) 32bit key Packet Classifier.
3  *
4  *              This program is free software; you can redistribute it and/or
5  *              modify it under the terms of the GNU General Public License
6  *              as published by the Free Software Foundation; either version
7  *              2 of the License, or (at your option) any later version.
8  *
9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10  *
11  *      The filters are packed to hash tables of key nodes
12  *      with a set of 32bit key/mask pairs at every node.
13  *      Nodes reference next level hash tables etc.
14  *
15  *      This scheme is the best universal classifier I managed to
16  *      invent; it is not super-fast, but it is not slow (provided you
17  *      program it correctly), and general enough.  And its relative
18  *      speed grows as the number of rules becomes larger.
19  *
20  *      It seems that it represents the best middle point between
21  *      speed and manageability both by human and by machine.
22  *
23  *      It is especially useful for link sharing combined with QoS;
24  *      pure RSVP doesn't need such a general approach and can use
25  *      much simpler (and faster) schemes, sort of cls_rsvp.c.
26  *
27  *      JHS: We should remove the CONFIG_NET_CLS_IND from here
28  *      eventually when the meta match extension is made available
29  *
30  *      nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
31  */
32
33 #include <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 <linux/netdevice.h>
44 #include <linux/hash.h>
45 #include <net/netlink.h>
46 #include <net/act_api.h>
47 #include <net/pkt_cls.h>
48 #include <linux/idr.h>
49
50 struct tc_u_knode {
51         struct tc_u_knode __rcu *next;
52         u32                     handle;
53         struct tc_u_hnode __rcu *ht_up;
54         struct tcf_exts         exts;
55 #ifdef CONFIG_NET_CLS_IND
56         int                     ifindex;
57 #endif
58         u8                      fshift;
59         struct tcf_result       res;
60         struct tc_u_hnode __rcu *ht_down;
61 #ifdef CONFIG_CLS_U32_PERF
62         struct tc_u32_pcnt __percpu *pf;
63 #endif
64         u32                     flags;
65 #ifdef CONFIG_CLS_U32_MARK
66         u32                     val;
67         u32                     mask;
68         u32 __percpu            *pcpu_success;
69 #endif
70         struct tcf_proto        *tp;
71         union {
72                 struct work_struct      work;
73                 struct rcu_head         rcu;
74         };
75         /* The 'sel' field MUST be the last field in structure to allow for
76          * tc_u32_keys allocated at end of structure.
77          */
78         struct tc_u32_sel       sel;
79 };
80
81 struct tc_u_hnode {
82         struct tc_u_hnode __rcu *next;
83         u32                     handle;
84         u32                     prio;
85         struct tc_u_common      *tp_c;
86         int                     refcnt;
87         unsigned int            divisor;
88         struct idr              handle_idr;
89         struct rcu_head         rcu;
90         u32                     flags;
91         /* The 'ht' field MUST be the last field in structure to allow for
92          * more entries allocated at end of structure.
93          */
94         struct tc_u_knode __rcu *ht[1];
95 };
96
97 struct tc_u_common {
98         struct tc_u_hnode __rcu *hlist;
99         struct tcf_block        *block;
100         int                     refcnt;
101         struct idr              handle_idr;
102         struct hlist_node       hnode;
103         struct rcu_head         rcu;
104 };
105
106 static inline unsigned int u32_hash_fold(__be32 key,
107                                          const struct tc_u32_sel *sel,
108                                          u8 fshift)
109 {
110         unsigned int h = ntohl(key & sel->hmask) >> fshift;
111
112         return h;
113 }
114
115 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
116                         struct tcf_result *res)
117 {
118         struct {
119                 struct tc_u_knode *knode;
120                 unsigned int      off;
121         } stack[TC_U32_MAXDEPTH];
122
123         struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
124         unsigned int off = skb_network_offset(skb);
125         struct tc_u_knode *n;
126         int sdepth = 0;
127         int off2 = 0;
128         int sel = 0;
129 #ifdef CONFIG_CLS_U32_PERF
130         int j;
131 #endif
132         int i, r;
133
134 next_ht:
135         n = rcu_dereference_bh(ht->ht[sel]);
136
137 next_knode:
138         if (n) {
139                 struct tc_u32_key *key = n->sel.keys;
140
141 #ifdef CONFIG_CLS_U32_PERF
142                 __this_cpu_inc(n->pf->rcnt);
143                 j = 0;
144 #endif
145
146                 if (tc_skip_sw(n->flags)) {
147                         n = rcu_dereference_bh(n->next);
148                         goto next_knode;
149                 }
150
151 #ifdef CONFIG_CLS_U32_MARK
152                 if ((skb->mark & n->mask) != n->val) {
153                         n = rcu_dereference_bh(n->next);
154                         goto next_knode;
155                 } else {
156                         __this_cpu_inc(*n->pcpu_success);
157                 }
158 #endif
159
160                 for (i = n->sel.nkeys; i > 0; i--, key++) {
161                         int toff = off + key->off + (off2 & key->offmask);
162                         __be32 *data, hdata;
163
164                         if (skb_headroom(skb) + toff > INT_MAX)
165                                 goto out;
166
167                         data = skb_header_pointer(skb, toff, 4, &hdata);
168                         if (!data)
169                                 goto out;
170                         if ((*data ^ key->val) & key->mask) {
171                                 n = rcu_dereference_bh(n->next);
172                                 goto next_knode;
173                         }
174 #ifdef CONFIG_CLS_U32_PERF
175                         __this_cpu_inc(n->pf->kcnts[j]);
176                         j++;
177 #endif
178                 }
179
180                 ht = rcu_dereference_bh(n->ht_down);
181                 if (!ht) {
182 check_terminal:
183                         if (n->sel.flags & TC_U32_TERMINAL) {
184
185                                 *res = n->res;
186 #ifdef CONFIG_NET_CLS_IND
187                                 if (!tcf_match_indev(skb, n->ifindex)) {
188                                         n = rcu_dereference_bh(n->next);
189                                         goto next_knode;
190                                 }
191 #endif
192 #ifdef CONFIG_CLS_U32_PERF
193                                 __this_cpu_inc(n->pf->rhit);
194 #endif
195                                 r = tcf_exts_exec(skb, &n->exts, res);
196                                 if (r < 0) {
197                                         n = rcu_dereference_bh(n->next);
198                                         goto next_knode;
199                                 }
200
201                                 return r;
202                         }
203                         n = rcu_dereference_bh(n->next);
204                         goto next_knode;
205                 }
206
207                 /* PUSH */
208                 if (sdepth >= TC_U32_MAXDEPTH)
209                         goto deadloop;
210                 stack[sdepth].knode = n;
211                 stack[sdepth].off = off;
212                 sdepth++;
213
214                 ht = rcu_dereference_bh(n->ht_down);
215                 sel = 0;
216                 if (ht->divisor) {
217                         __be32 *data, hdata;
218
219                         data = skb_header_pointer(skb, off + n->sel.hoff, 4,
220                                                   &hdata);
221                         if (!data)
222                                 goto out;
223                         sel = ht->divisor & u32_hash_fold(*data, &n->sel,
224                                                           n->fshift);
225                 }
226                 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
227                         goto next_ht;
228
229                 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
230                         off2 = n->sel.off + 3;
231                         if (n->sel.flags & TC_U32_VAROFFSET) {
232                                 __be16 *data, hdata;
233
234                                 data = skb_header_pointer(skb,
235                                                           off + n->sel.offoff,
236                                                           2, &hdata);
237                                 if (!data)
238                                         goto out;
239                                 off2 += ntohs(n->sel.offmask & *data) >>
240                                         n->sel.offshift;
241                         }
242                         off2 &= ~3;
243                 }
244                 if (n->sel.flags & TC_U32_EAT) {
245                         off += off2;
246                         off2 = 0;
247                 }
248
249                 if (off < skb->len)
250                         goto next_ht;
251         }
252
253         /* POP */
254         if (sdepth--) {
255                 n = stack[sdepth].knode;
256                 ht = rcu_dereference_bh(n->ht_up);
257                 off = stack[sdepth].off;
258                 goto check_terminal;
259         }
260 out:
261         return -1;
262
263 deadloop:
264         net_warn_ratelimited("cls_u32: dead loop\n");
265         return -1;
266 }
267
268 static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
269 {
270         struct tc_u_hnode *ht;
271
272         for (ht = rtnl_dereference(tp_c->hlist);
273              ht;
274              ht = rtnl_dereference(ht->next))
275                 if (ht->handle == handle)
276                         break;
277
278         return ht;
279 }
280
281 static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
282 {
283         unsigned int sel;
284         struct tc_u_knode *n = NULL;
285
286         sel = TC_U32_HASH(handle);
287         if (sel > ht->divisor)
288                 goto out;
289
290         for (n = rtnl_dereference(ht->ht[sel]);
291              n;
292              n = rtnl_dereference(n->next))
293                 if (n->handle == handle)
294                         break;
295 out:
296         return n;
297 }
298
299
300 static void *u32_get(struct tcf_proto *tp, u32 handle)
301 {
302         struct tc_u_hnode *ht;
303         struct tc_u_common *tp_c = tp->data;
304
305         if (TC_U32_HTID(handle) == TC_U32_ROOT)
306                 ht = rtnl_dereference(tp->root);
307         else
308                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
309
310         if (!ht)
311                 return NULL;
312
313         if (TC_U32_KEY(handle) == 0)
314                 return ht;
315
316         return u32_lookup_key(ht, handle);
317 }
318
319 /* Protected by rtnl lock */
320 static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
321 {
322         int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL);
323         if (id < 0)
324                 return 0;
325         return (id | 0x800U) << 20;
326 }
327
328 static struct hlist_head *tc_u_common_hash;
329
330 #define U32_HASH_SHIFT 10
331 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
332
333 static unsigned int tc_u_hash(const struct tcf_proto *tp)
334 {
335         return hash_ptr(tp->chain->block, U32_HASH_SHIFT);
336 }
337
338 static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
339 {
340         struct tc_u_common *tc;
341         unsigned int h;
342
343         h = tc_u_hash(tp);
344         hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
345                 if (tc->block == tp->chain->block)
346                         return tc;
347         }
348         return NULL;
349 }
350
351 static int u32_init(struct tcf_proto *tp)
352 {
353         struct tc_u_hnode *root_ht;
354         struct tc_u_common *tp_c;
355         unsigned int h;
356
357         tp_c = tc_u_common_find(tp);
358
359         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
360         if (root_ht == NULL)
361                 return -ENOBUFS;
362
363         root_ht->refcnt++;
364         root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
365         root_ht->prio = tp->prio;
366         idr_init(&root_ht->handle_idr);
367
368         if (tp_c == NULL) {
369                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
370                 if (tp_c == NULL) {
371                         kfree(root_ht);
372                         return -ENOBUFS;
373                 }
374                 tp_c->block = tp->chain->block;
375                 INIT_HLIST_NODE(&tp_c->hnode);
376                 idr_init(&tp_c->handle_idr);
377
378                 h = tc_u_hash(tp);
379                 hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
380         }
381
382         tp_c->refcnt++;
383         RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
384         rcu_assign_pointer(tp_c->hlist, root_ht);
385         root_ht->tp_c = tp_c;
386
387         rcu_assign_pointer(tp->root, root_ht);
388         tp->data = tp_c;
389         return 0;
390 }
391
392 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
393                            bool free_pf)
394 {
395         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
396
397         tcf_exts_destroy(&n->exts);
398         tcf_exts_put_net(&n->exts);
399         if (ht && --ht->refcnt == 0)
400                 kfree(ht);
401 #ifdef CONFIG_CLS_U32_PERF
402         if (free_pf)
403                 free_percpu(n->pf);
404 #endif
405 #ifdef CONFIG_CLS_U32_MARK
406         if (free_pf)
407                 free_percpu(n->pcpu_success);
408 #endif
409         kfree(n);
410         return 0;
411 }
412
413 /* u32_delete_key_rcu should be called when free'ing a copied
414  * version of a tc_u_knode obtained from u32_init_knode(). When
415  * copies are obtained from u32_init_knode() the statistics are
416  * shared between the old and new copies to allow readers to
417  * continue to update the statistics during the copy. To support
418  * this the u32_delete_key_rcu variant does not free the percpu
419  * statistics.
420  */
421 static void u32_delete_key_work(struct work_struct *work)
422 {
423         struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
424
425         rtnl_lock();
426         u32_destroy_key(key->tp, key, false);
427         rtnl_unlock();
428 }
429
430 static void u32_delete_key_rcu(struct rcu_head *rcu)
431 {
432         struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
433
434         INIT_WORK(&key->work, u32_delete_key_work);
435         tcf_queue_work(&key->work);
436 }
437
438 /* u32_delete_key_freepf_rcu is the rcu callback variant
439  * that free's the entire structure including the statistics
440  * percpu variables. Only use this if the key is not a copy
441  * returned by u32_init_knode(). See u32_delete_key_rcu()
442  * for the variant that should be used with keys return from
443  * u32_init_knode()
444  */
445 static void u32_delete_key_freepf_work(struct work_struct *work)
446 {
447         struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
448
449         rtnl_lock();
450         u32_destroy_key(key->tp, key, true);
451         rtnl_unlock();
452 }
453
454 static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
455 {
456         struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
457
458         INIT_WORK(&key->work, u32_delete_key_freepf_work);
459         tcf_queue_work(&key->work);
460 }
461
462 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
463 {
464         struct tc_u_knode __rcu **kp;
465         struct tc_u_knode *pkp;
466         struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
467
468         if (ht) {
469                 kp = &ht->ht[TC_U32_HASH(key->handle)];
470                 for (pkp = rtnl_dereference(*kp); pkp;
471                      kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
472                         if (pkp == key) {
473                                 RCU_INIT_POINTER(*kp, key->next);
474
475                                 tcf_unbind_filter(tp, &key->res);
476                                 tcf_exts_get_net(&key->exts);
477                                 call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
478                                 return 0;
479                         }
480                 }
481         }
482         WARN_ON(1);
483         return 0;
484 }
485
486 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
487                                struct netlink_ext_ack *extack)
488 {
489         struct tcf_block *block = tp->chain->block;
490         struct tc_cls_u32_offload cls_u32 = {};
491
492         tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
493         cls_u32.command = TC_CLSU32_DELETE_HNODE;
494         cls_u32.hnode.divisor = h->divisor;
495         cls_u32.hnode.handle = h->handle;
496         cls_u32.hnode.prio = h->prio;
497
498         tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
499 }
500
501 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
502                                 u32 flags, struct netlink_ext_ack *extack)
503 {
504         struct tcf_block *block = tp->chain->block;
505         struct tc_cls_u32_offload cls_u32 = {};
506         bool skip_sw = tc_skip_sw(flags);
507         bool offloaded = false;
508         int err;
509
510         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
511         cls_u32.command = TC_CLSU32_NEW_HNODE;
512         cls_u32.hnode.divisor = h->divisor;
513         cls_u32.hnode.handle = h->handle;
514         cls_u32.hnode.prio = h->prio;
515
516         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
517         if (err < 0) {
518                 u32_clear_hw_hnode(tp, h, NULL);
519                 return err;
520         } else if (err > 0) {
521                 offloaded = true;
522         }
523
524         if (skip_sw && !offloaded)
525                 return -EINVAL;
526
527         return 0;
528 }
529
530 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
531                                 struct netlink_ext_ack *extack)
532 {
533         struct tcf_block *block = tp->chain->block;
534         struct tc_cls_u32_offload cls_u32 = {};
535
536         tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
537         cls_u32.command = TC_CLSU32_DELETE_KNODE;
538         cls_u32.knode.handle = n->handle;
539
540         tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
541         tcf_block_offload_dec(block, &n->flags);
542 }
543
544 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
545                                 u32 flags, struct netlink_ext_ack *extack)
546 {
547         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
548         struct tcf_block *block = tp->chain->block;
549         struct tc_cls_u32_offload cls_u32 = {};
550         bool skip_sw = tc_skip_sw(flags);
551         int err;
552
553         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
554         cls_u32.command = TC_CLSU32_REPLACE_KNODE;
555         cls_u32.knode.handle = n->handle;
556         cls_u32.knode.fshift = n->fshift;
557 #ifdef CONFIG_CLS_U32_MARK
558         cls_u32.knode.val = n->val;
559         cls_u32.knode.mask = n->mask;
560 #else
561         cls_u32.knode.val = 0;
562         cls_u32.knode.mask = 0;
563 #endif
564         cls_u32.knode.sel = &n->sel;
565         cls_u32.knode.exts = &n->exts;
566         if (n->ht_down)
567                 cls_u32.knode.link_handle = ht->handle;
568
569         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
570         if (err < 0) {
571                 u32_remove_hw_knode(tp, n, NULL);
572                 return err;
573         } else if (err > 0) {
574                 tcf_block_offload_inc(block, &n->flags);
575         }
576
577         if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
578                 return -EINVAL;
579
580         return 0;
581 }
582
583 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
584                             struct netlink_ext_ack *extack)
585 {
586         struct tc_u_knode *n;
587         unsigned int h;
588
589         for (h = 0; h <= ht->divisor; h++) {
590                 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
591                         RCU_INIT_POINTER(ht->ht[h],
592                                          rtnl_dereference(n->next));
593                         tcf_unbind_filter(tp, &n->res);
594                         u32_remove_hw_knode(tp, n, extack);
595                         idr_remove(&ht->handle_idr, n->handle);
596                         if (tcf_exts_get_net(&n->exts))
597                                 call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
598                         else
599                                 u32_destroy_key(n->tp, n, true);
600                 }
601         }
602 }
603
604 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
605                              struct netlink_ext_ack *extack)
606 {
607         struct tc_u_common *tp_c = tp->data;
608         struct tc_u_hnode __rcu **hn;
609         struct tc_u_hnode *phn;
610
611         WARN_ON(ht->refcnt);
612
613         u32_clear_hnode(tp, ht, extack);
614
615         hn = &tp_c->hlist;
616         for (phn = rtnl_dereference(*hn);
617              phn;
618              hn = &phn->next, phn = rtnl_dereference(*hn)) {
619                 if (phn == ht) {
620                         u32_clear_hw_hnode(tp, ht, extack);
621                         idr_destroy(&ht->handle_idr);
622                         idr_remove(&tp_c->handle_idr, ht->handle);
623                         RCU_INIT_POINTER(*hn, ht->next);
624                         kfree_rcu(ht, rcu);
625                         return 0;
626                 }
627         }
628
629         return -ENOENT;
630 }
631
632 static bool ht_empty(struct tc_u_hnode *ht)
633 {
634         unsigned int h;
635
636         for (h = 0; h <= ht->divisor; h++)
637                 if (rcu_access_pointer(ht->ht[h]))
638                         return false;
639
640         return true;
641 }
642
643 static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
644 {
645         struct tc_u_common *tp_c = tp->data;
646         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
647
648         WARN_ON(root_ht == NULL);
649
650         if (root_ht && --root_ht->refcnt == 0)
651                 u32_destroy_hnode(tp, root_ht, extack);
652
653         if (--tp_c->refcnt == 0) {
654                 struct tc_u_hnode *ht;
655
656                 hlist_del(&tp_c->hnode);
657
658                 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
659                         u32_clear_hnode(tp, ht, extack);
660                         RCU_INIT_POINTER(tp_c->hlist, ht->next);
661
662                         /* u32_destroy_key() will later free ht for us, if it's
663                          * still referenced by some knode
664                          */
665                         if (--ht->refcnt == 0)
666                                 kfree_rcu(ht, rcu);
667                 }
668
669                 idr_destroy(&tp_c->handle_idr);
670                 kfree(tp_c);
671         }
672
673         tp->data = NULL;
674 }
675
676 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
677                       struct netlink_ext_ack *extack)
678 {
679         struct tc_u_hnode *ht = arg;
680         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
681         struct tc_u_common *tp_c = tp->data;
682         int ret = 0;
683
684         if (ht == NULL)
685                 goto out;
686
687         if (TC_U32_KEY(ht->handle)) {
688                 u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
689                 ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
690                 goto out;
691         }
692
693         if (root_ht == ht) {
694                 NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
695                 return -EINVAL;
696         }
697
698         if (ht->refcnt == 1) {
699                 ht->refcnt--;
700                 u32_destroy_hnode(tp, ht, extack);
701         } else {
702                 NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
703                 return -EBUSY;
704         }
705
706 out:
707         *last = true;
708         if (root_ht) {
709                 if (root_ht->refcnt > 1) {
710                         *last = false;
711                         goto ret;
712                 }
713                 if (root_ht->refcnt == 1) {
714                         if (!ht_empty(root_ht)) {
715                                 *last = false;
716                                 goto ret;
717                         }
718                 }
719         }
720
721         if (tp_c->refcnt > 1) {
722                 *last = false;
723                 goto ret;
724         }
725
726         if (tp_c->refcnt == 1) {
727                 struct tc_u_hnode *ht;
728
729                 for (ht = rtnl_dereference(tp_c->hlist);
730                      ht;
731                      ht = rtnl_dereference(ht->next))
732                         if (!ht_empty(ht)) {
733                                 *last = false;
734                                 break;
735                         }
736         }
737
738 ret:
739         return ret;
740 }
741
742 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
743 {
744         u32 index = htid | 0x800;
745         u32 max = htid | 0xFFF;
746
747         if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) {
748                 index = htid + 1;
749                 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max,
750                                  GFP_KERNEL))
751                         index = max;
752         }
753
754         return index;
755 }
756
757 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
758         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
759         [TCA_U32_HASH]          = { .type = NLA_U32 },
760         [TCA_U32_LINK]          = { .type = NLA_U32 },
761         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
762         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
763         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
764         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
765         [TCA_U32_FLAGS]         = { .type = NLA_U32 },
766 };
767
768 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
769                          unsigned long base, struct tc_u_hnode *ht,
770                          struct tc_u_knode *n, struct nlattr **tb,
771                          struct nlattr *est, bool ovr,
772                          struct netlink_ext_ack *extack)
773 {
774         int err;
775
776         err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
777         if (err < 0)
778                 return err;
779
780         if (tb[TCA_U32_LINK]) {
781                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
782                 struct tc_u_hnode *ht_down = NULL, *ht_old;
783
784                 if (TC_U32_KEY(handle)) {
785                         NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
786                         return -EINVAL;
787                 }
788
789                 if (handle) {
790                         ht_down = u32_lookup_ht(ht->tp_c, handle);
791
792                         if (!ht_down) {
793                                 NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
794                                 return -EINVAL;
795                         }
796                         ht_down->refcnt++;
797                 }
798
799                 ht_old = rtnl_dereference(n->ht_down);
800                 rcu_assign_pointer(n->ht_down, ht_down);
801
802                 if (ht_old)
803                         ht_old->refcnt--;
804         }
805         if (tb[TCA_U32_CLASSID]) {
806                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
807                 tcf_bind_filter(tp, &n->res, base);
808         }
809
810 #ifdef CONFIG_NET_CLS_IND
811         if (tb[TCA_U32_INDEV]) {
812                 int ret;
813                 ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
814                 if (ret < 0)
815                         return -EINVAL;
816                 n->ifindex = ret;
817         }
818 #endif
819         return 0;
820 }
821
822 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
823                               struct tc_u_knode *n)
824 {
825         struct tc_u_knode __rcu **ins;
826         struct tc_u_knode *pins;
827         struct tc_u_hnode *ht;
828
829         if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
830                 ht = rtnl_dereference(tp->root);
831         else
832                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
833
834         ins = &ht->ht[TC_U32_HASH(n->handle)];
835
836         /* The node must always exist for it to be replaced if this is not the
837          * case then something went very wrong elsewhere.
838          */
839         for (pins = rtnl_dereference(*ins); ;
840              ins = &pins->next, pins = rtnl_dereference(*ins))
841                 if (pins->handle == n->handle)
842                         break;
843
844         idr_replace(&ht->handle_idr, n, n->handle);
845         RCU_INIT_POINTER(n->next, pins->next);
846         rcu_assign_pointer(*ins, n);
847 }
848
849 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
850                                          struct tc_u_knode *n)
851 {
852         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
853         struct tc_u32_sel *s = &n->sel;
854         struct tc_u_knode *new;
855
856         new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
857                       GFP_KERNEL);
858
859         if (!new)
860                 return NULL;
861
862         RCU_INIT_POINTER(new->next, n->next);
863         new->handle = n->handle;
864         RCU_INIT_POINTER(new->ht_up, n->ht_up);
865
866 #ifdef CONFIG_NET_CLS_IND
867         new->ifindex = n->ifindex;
868 #endif
869         new->fshift = n->fshift;
870         new->res = n->res;
871         new->flags = n->flags;
872         RCU_INIT_POINTER(new->ht_down, ht);
873
874         /* bump reference count as long as we hold pointer to structure */
875         if (ht)
876                 ht->refcnt++;
877
878 #ifdef CONFIG_CLS_U32_PERF
879         /* Statistics may be incremented by readers during update
880          * so we must keep them in tact. When the node is later destroyed
881          * a special destroy call must be made to not free the pf memory.
882          */
883         new->pf = n->pf;
884 #endif
885
886 #ifdef CONFIG_CLS_U32_MARK
887         new->val = n->val;
888         new->mask = n->mask;
889         /* Similarly success statistics must be moved as pointers */
890         new->pcpu_success = n->pcpu_success;
891 #endif
892         new->tp = tp;
893         memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
894
895         if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
896                 kfree(new);
897                 return NULL;
898         }
899
900         return new;
901 }
902
903 static int u32_change(struct net *net, struct sk_buff *in_skb,
904                       struct tcf_proto *tp, unsigned long base, u32 handle,
905                       struct nlattr **tca, void **arg, bool ovr,
906                       struct netlink_ext_ack *extack)
907 {
908         struct tc_u_common *tp_c = tp->data;
909         struct tc_u_hnode *ht;
910         struct tc_u_knode *n;
911         struct tc_u32_sel *s;
912         struct nlattr *opt = tca[TCA_OPTIONS];
913         struct nlattr *tb[TCA_U32_MAX + 1];
914         u32 htid, flags = 0;
915         int err;
916 #ifdef CONFIG_CLS_U32_PERF
917         size_t size;
918 #endif
919
920         if (!opt) {
921                 if (handle) {
922                         NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
923                         return -EINVAL;
924                 } else {
925                         return 0;
926                 }
927         }
928
929         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack);
930         if (err < 0)
931                 return err;
932
933         if (tb[TCA_U32_FLAGS]) {
934                 flags = nla_get_u32(tb[TCA_U32_FLAGS]);
935                 if (!tc_flags_valid(flags)) {
936                         NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
937                         return -EINVAL;
938                 }
939         }
940
941         n = *arg;
942         if (n) {
943                 struct tc_u_knode *new;
944
945                 if (TC_U32_KEY(n->handle) == 0) {
946                         NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
947                         return -EINVAL;
948                 }
949
950                 if ((n->flags ^ flags) &
951                     ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) {
952                         NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
953                         return -EINVAL;
954                 }
955
956                 new = u32_init_knode(tp, n);
957                 if (!new)
958                         return -ENOMEM;
959
960                 err = u32_set_parms(net, tp, base,
961                                     rtnl_dereference(n->ht_up), new, tb,
962                                     tca[TCA_RATE], ovr, extack);
963
964                 if (err) {
965                         u32_destroy_key(tp, new, false);
966                         return err;
967                 }
968
969                 err = u32_replace_hw_knode(tp, new, flags, extack);
970                 if (err) {
971                         u32_destroy_key(tp, new, false);
972                         return err;
973                 }
974
975                 if (!tc_in_hw(new->flags))
976                         new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
977
978                 u32_replace_knode(tp, tp_c, new);
979                 tcf_unbind_filter(tp, &n->res);
980                 tcf_exts_get_net(&n->exts);
981                 call_rcu(&n->rcu, u32_delete_key_rcu);
982                 return 0;
983         }
984
985         if (tb[TCA_U32_DIVISOR]) {
986                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
987
988                 if (--divisor > 0x100) {
989                         NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
990                         return -EINVAL;
991                 }
992                 if (TC_U32_KEY(handle)) {
993                         NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
994                         return -EINVAL;
995                 }
996                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
997                 if (ht == NULL)
998                         return -ENOBUFS;
999                 if (handle == 0) {
1000                         handle = gen_new_htid(tp->data, ht);
1001                         if (handle == 0) {
1002                                 kfree(ht);
1003                                 return -ENOMEM;
1004                         }
1005                 } else {
1006                         err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
1007                                             handle, GFP_KERNEL);
1008                         if (err) {
1009                                 kfree(ht);
1010                                 return err;
1011                         }
1012                 }
1013                 ht->tp_c = tp_c;
1014                 ht->refcnt = 1;
1015                 ht->divisor = divisor;
1016                 ht->handle = handle;
1017                 ht->prio = tp->prio;
1018                 idr_init(&ht->handle_idr);
1019                 ht->flags = flags;
1020
1021                 err = u32_replace_hw_hnode(tp, ht, flags, extack);
1022                 if (err) {
1023                         idr_remove(&tp_c->handle_idr, handle);
1024                         kfree(ht);
1025                         return err;
1026                 }
1027
1028                 RCU_INIT_POINTER(ht->next, tp_c->hlist);
1029                 rcu_assign_pointer(tp_c->hlist, ht);
1030                 *arg = ht;
1031
1032                 return 0;
1033         }
1034
1035         if (tb[TCA_U32_HASH]) {
1036                 htid = nla_get_u32(tb[TCA_U32_HASH]);
1037                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
1038                         ht = rtnl_dereference(tp->root);
1039                         htid = ht->handle;
1040                 } else {
1041                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
1042                         if (!ht) {
1043                                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
1044                                 return -EINVAL;
1045                         }
1046                 }
1047         } else {
1048                 ht = rtnl_dereference(tp->root);
1049                 htid = ht->handle;
1050         }
1051
1052         if (ht->divisor < TC_U32_HASH(htid)) {
1053                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
1054                 return -EINVAL;
1055         }
1056
1057         if (handle) {
1058                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1059                         NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1060                         return -EINVAL;
1061                 }
1062                 handle = htid | TC_U32_NODE(handle);
1063                 err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
1064                                     GFP_KERNEL);
1065                 if (err)
1066                         return err;
1067         } else
1068                 handle = gen_new_kid(ht, htid);
1069
1070         if (tb[TCA_U32_SEL] == NULL) {
1071                 NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1072                 err = -EINVAL;
1073                 goto erridr;
1074         }
1075
1076         s = nla_data(tb[TCA_U32_SEL]);
1077
1078         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
1079         if (n == NULL) {
1080                 err = -ENOBUFS;
1081                 goto erridr;
1082         }
1083
1084 #ifdef CONFIG_CLS_U32_PERF
1085         size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1086         n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1087         if (!n->pf) {
1088                 err = -ENOBUFS;
1089                 goto errfree;
1090         }
1091 #endif
1092
1093         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
1094         RCU_INIT_POINTER(n->ht_up, ht);
1095         n->handle = handle;
1096         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1097         n->flags = flags;
1098         n->tp = tp;
1099
1100         err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1101         if (err < 0)
1102                 goto errout;
1103
1104 #ifdef CONFIG_CLS_U32_MARK
1105         n->pcpu_success = alloc_percpu(u32);
1106         if (!n->pcpu_success) {
1107                 err = -ENOMEM;
1108                 goto errout;
1109         }
1110
1111         if (tb[TCA_U32_MARK]) {
1112                 struct tc_u32_mark *mark;
1113
1114                 mark = nla_data(tb[TCA_U32_MARK]);
1115                 n->val = mark->val;
1116                 n->mask = mark->mask;
1117         }
1118 #endif
1119
1120         err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr,
1121                             extack);
1122         if (err == 0) {
1123                 struct tc_u_knode __rcu **ins;
1124                 struct tc_u_knode *pins;
1125
1126                 err = u32_replace_hw_knode(tp, n, flags, extack);
1127                 if (err)
1128                         goto errhw;
1129
1130                 if (!tc_in_hw(n->flags))
1131                         n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1132
1133                 ins = &ht->ht[TC_U32_HASH(handle)];
1134                 for (pins = rtnl_dereference(*ins); pins;
1135                      ins = &pins->next, pins = rtnl_dereference(*ins))
1136                         if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1137                                 break;
1138
1139                 RCU_INIT_POINTER(n->next, pins);
1140                 rcu_assign_pointer(*ins, n);
1141                 *arg = n;
1142                 return 0;
1143         }
1144
1145 errhw:
1146 #ifdef CONFIG_CLS_U32_MARK
1147         free_percpu(n->pcpu_success);
1148 #endif
1149
1150 errout:
1151         tcf_exts_destroy(&n->exts);
1152 #ifdef CONFIG_CLS_U32_PERF
1153 errfree:
1154         free_percpu(n->pf);
1155 #endif
1156         kfree(n);
1157 erridr:
1158         idr_remove(&ht->handle_idr, handle);
1159         return err;
1160 }
1161
1162 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1163 {
1164         struct tc_u_common *tp_c = tp->data;
1165         struct tc_u_hnode *ht;
1166         struct tc_u_knode *n;
1167         unsigned int h;
1168
1169         if (arg->stop)
1170                 return;
1171
1172         for (ht = rtnl_dereference(tp_c->hlist);
1173              ht;
1174              ht = rtnl_dereference(ht->next)) {
1175                 if (ht->prio != tp->prio)
1176                         continue;
1177                 if (arg->count >= arg->skip) {
1178                         if (arg->fn(tp, ht, arg) < 0) {
1179                                 arg->stop = 1;
1180                                 return;
1181                         }
1182                 }
1183                 arg->count++;
1184                 for (h = 0; h <= ht->divisor; h++) {
1185                         for (n = rtnl_dereference(ht->ht[h]);
1186                              n;
1187                              n = rtnl_dereference(n->next)) {
1188                                 if (arg->count < arg->skip) {
1189                                         arg->count++;
1190                                         continue;
1191                                 }
1192                                 if (arg->fn(tp, n, arg) < 0) {
1193                                         arg->stop = 1;
1194                                         return;
1195                                 }
1196                                 arg->count++;
1197                         }
1198                 }
1199         }
1200 }
1201
1202 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1203 {
1204         struct tc_u_knode *n = fh;
1205
1206         if (n && n->res.classid == classid)
1207                 n->res.class = cl;
1208 }
1209
1210 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1211                     struct sk_buff *skb, struct tcmsg *t)
1212 {
1213         struct tc_u_knode *n = fh;
1214         struct tc_u_hnode *ht_up, *ht_down;
1215         struct nlattr *nest;
1216
1217         if (n == NULL)
1218                 return skb->len;
1219
1220         t->tcm_handle = n->handle;
1221
1222         nest = nla_nest_start(skb, TCA_OPTIONS);
1223         if (nest == NULL)
1224                 goto nla_put_failure;
1225
1226         if (TC_U32_KEY(n->handle) == 0) {
1227                 struct tc_u_hnode *ht = fh;
1228                 u32 divisor = ht->divisor + 1;
1229
1230                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1231                         goto nla_put_failure;
1232         } else {
1233 #ifdef CONFIG_CLS_U32_PERF
1234                 struct tc_u32_pcnt *gpf;
1235                 int cpu;
1236 #endif
1237
1238                 if (nla_put(skb, TCA_U32_SEL,
1239                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1240                             &n->sel))
1241                         goto nla_put_failure;
1242
1243                 ht_up = rtnl_dereference(n->ht_up);
1244                 if (ht_up) {
1245                         u32 htid = n->handle & 0xFFFFF000;
1246                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
1247                                 goto nla_put_failure;
1248                 }
1249                 if (n->res.classid &&
1250                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1251                         goto nla_put_failure;
1252
1253                 ht_down = rtnl_dereference(n->ht_down);
1254                 if (ht_down &&
1255                     nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1256                         goto nla_put_failure;
1257
1258                 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1259                         goto nla_put_failure;
1260
1261 #ifdef CONFIG_CLS_U32_MARK
1262                 if ((n->val || n->mask)) {
1263                         struct tc_u32_mark mark = {.val = n->val,
1264                                                    .mask = n->mask,
1265                                                    .success = 0};
1266                         int cpum;
1267
1268                         for_each_possible_cpu(cpum) {
1269                                 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1270
1271                                 mark.success += cnt;
1272                         }
1273
1274                         if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1275                                 goto nla_put_failure;
1276                 }
1277 #endif
1278
1279                 if (tcf_exts_dump(skb, &n->exts) < 0)
1280                         goto nla_put_failure;
1281
1282 #ifdef CONFIG_NET_CLS_IND
1283                 if (n->ifindex) {
1284                         struct net_device *dev;
1285                         dev = __dev_get_by_index(net, n->ifindex);
1286                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1287                                 goto nla_put_failure;
1288                 }
1289 #endif
1290 #ifdef CONFIG_CLS_U32_PERF
1291                 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1292                               n->sel.nkeys * sizeof(u64),
1293                               GFP_KERNEL);
1294                 if (!gpf)
1295                         goto nla_put_failure;
1296
1297                 for_each_possible_cpu(cpu) {
1298                         int i;
1299                         struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1300
1301                         gpf->rcnt += pf->rcnt;
1302                         gpf->rhit += pf->rhit;
1303                         for (i = 0; i < n->sel.nkeys; i++)
1304                                 gpf->kcnts[i] += pf->kcnts[i];
1305                 }
1306
1307                 if (nla_put_64bit(skb, TCA_U32_PCNT,
1308                                   sizeof(struct tc_u32_pcnt) +
1309                                   n->sel.nkeys * sizeof(u64),
1310                                   gpf, TCA_U32_PAD)) {
1311                         kfree(gpf);
1312                         goto nla_put_failure;
1313                 }
1314                 kfree(gpf);
1315 #endif
1316         }
1317
1318         nla_nest_end(skb, nest);
1319
1320         if (TC_U32_KEY(n->handle))
1321                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1322                         goto nla_put_failure;
1323         return skb->len;
1324
1325 nla_put_failure:
1326         nla_nest_cancel(skb, nest);
1327         return -1;
1328 }
1329
1330 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1331         .kind           =       "u32",
1332         .classify       =       u32_classify,
1333         .init           =       u32_init,
1334         .destroy        =       u32_destroy,
1335         .get            =       u32_get,
1336         .change         =       u32_change,
1337         .delete         =       u32_delete,
1338         .walk           =       u32_walk,
1339         .dump           =       u32_dump,
1340         .bind_class     =       u32_bind_class,
1341         .owner          =       THIS_MODULE,
1342 };
1343
1344 static int __init init_u32(void)
1345 {
1346         int i, ret;
1347
1348         pr_info("u32 classifier\n");
1349 #ifdef CONFIG_CLS_U32_PERF
1350         pr_info("    Performance counters on\n");
1351 #endif
1352 #ifdef CONFIG_NET_CLS_IND
1353         pr_info("    input device check on\n");
1354 #endif
1355 #ifdef CONFIG_NET_CLS_ACT
1356         pr_info("    Actions configured\n");
1357 #endif
1358         tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1359                                           sizeof(struct hlist_head),
1360                                           GFP_KERNEL);
1361         if (!tc_u_common_hash)
1362                 return -ENOMEM;
1363
1364         for (i = 0; i < U32_HASH_SIZE; i++)
1365                 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1366
1367         ret = register_tcf_proto_ops(&cls_u32_ops);
1368         if (ret)
1369                 kvfree(tc_u_common_hash);
1370         return ret;
1371 }
1372
1373 static void __exit exit_u32(void)
1374 {
1375         unregister_tcf_proto_ops(&cls_u32_ops);
1376         kvfree(tc_u_common_hash);
1377 }
1378
1379 module_init(init_u32)
1380 module_exit(exit_u32)
1381 MODULE_LICENSE("GPL");