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/netdevice.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 rcu_head         rcu;
  89         /* The 'ht' field MUST be the last field in structure to allow for
  90          * more entries allocated at end of structure.
  91          */
  92         struct tc_u_knode __rcu *ht[1];
  93 };
  94
  95 struct tc_u_common {
  96         struct tc_u_hnode __rcu *hlist;
  97         struct Qdisc            *q;
  98         int                     refcnt;
  99         u32                     hgenerator;
 100         struct hlist_node       hnode;
 101         struct rcu_head         rcu;
 102 };
 103
 104 static inline unsigned int u32_hash_fold(__be32 key,
 105                                          const struct tc_u32_sel *sel,
 106                                          u8 fshift)
 107 {
 108         unsigned int h = ntohl(key & sel->hmask) >> fshift;
 109
 110         return h;
 111 }
 112
 113 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 114                         struct tcf_result *res)
 115 {
 116         struct {
 117                 struct tc_u_knode *knode;
 118                 unsigned int      off;
 119         } stack[TC_U32_MAXDEPTH];
 120
 121         struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
 122         unsigned int off = skb_network_offset(skb);
 123         struct tc_u_knode *n;
 124         int sdepth = 0;
 125         int off2 = 0;
 126         int sel = 0;
 127 #ifdef CONFIG_CLS_U32_PERF
 128         int j;
 129 #endif
 130         int i, r;
 131
 132 next_ht:
 133         n = rcu_dereference_bh(ht->ht[sel]);
 134
 135 next_knode:
 136         if (n) {
 137                 struct tc_u32_key *key = n->sel.keys;
 138
 139 #ifdef CONFIG_CLS_U32_PERF
 140                 __this_cpu_inc(n->pf->rcnt);
 141                 j = 0;
 142 #endif
 143
 144                 if (tc_skip_sw(n->flags)) {
 145                         n = rcu_dereference_bh(n->next);
 146                         goto next_knode;
 147                 }
 148
 149 #ifdef CONFIG_CLS_U32_MARK
 150                 if ((skb->mark & n->mask) != n->val) {
 151                         n = rcu_dereference_bh(n->next);
 152                         goto next_knode;
 153                 } else {
 154                         __this_cpu_inc(*n->pcpu_success);
 155                 }
 156 #endif
 157
 158                 for (i = n->sel.nkeys; i > 0; i--, key++) {
 159                         int toff = off + key->off + (off2 & key->offmask);
 160                         __be32 *data, hdata;
 161
 162                         if (skb_headroom(skb) + toff > INT_MAX)
 163                                 goto out;
 164
 165                         data = skb_header_pointer(skb, toff, 4, &hdata);
 166                         if (!data)
 167                                 goto out;
 168                         if ((*data ^ key->val) & key->mask) {
 169                                 n = rcu_dereference_bh(n->next);
 170                                 goto next_knode;
 171                         }
 172 #ifdef CONFIG_CLS_U32_PERF
 173                         __this_cpu_inc(n->pf->kcnts[j]);
 174                         j++;
 175 #endif
 176                 }
 177
 178                 ht = rcu_dereference_bh(n->ht_down);
 179                 if (!ht) {
 180 check_terminal:
 181                         if (n->sel.flags & TC_U32_TERMINAL) {
 182
 183                                 *res = n->res;
 184 #ifdef CONFIG_NET_CLS_IND
 185                                 if (!tcf_match_indev(skb, n->ifindex)) {
 186                                         n = rcu_dereference_bh(n->next);
 187                                         goto next_knode;
 188                                 }
 189 #endif
 190 #ifdef CONFIG_CLS_U32_PERF
 191                                 __this_cpu_inc(n->pf->rhit);
 192 #endif
 193                                 r = tcf_exts_exec(skb, &n->exts, res);
 194                                 if (r < 0) {
 195                                         n = rcu_dereference_bh(n->next);
 196                                         goto next_knode;
 197                                 }
 198
 199                                 return r;
 200                         }
 201                         n = rcu_dereference_bh(n->next);
 202                         goto next_knode;
 203                 }
 204
 205                 /* PUSH */
 206                 if (sdepth >= TC_U32_MAXDEPTH)
 207                         goto deadloop;
 208                 stack[sdepth].knode = n;
 209                 stack[sdepth].off = off;
 210                 sdepth++;
 211
 212                 ht = rcu_dereference_bh(n->ht_down);
 213                 sel = 0;
 214                 if (ht->divisor) {
 215                         __be32 *data, hdata;
 216
 217                         data = skb_header_pointer(skb, off + n->sel.hoff, 4,
 218                                                   &hdata);
 219                         if (!data)
 220                                 goto out;
 221                         sel = ht->divisor & u32_hash_fold(*data, &n->sel,
 222                                                           n->fshift);
 223                 }
 224                 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
 225                         goto next_ht;
 226
 227                 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
 228                         off2 = n->sel.off + 3;
 229                         if (n->sel.flags & TC_U32_VAROFFSET) {
 230                                 __be16 *data, hdata;
 231
 232                                 data = skb_header_pointer(skb,
 233                                                           off + n->sel.offoff,
 234                                                           2, &hdata);
 235                                 if (!data)
 236                                         goto out;
 237                                 off2 += ntohs(n->sel.offmask & *data) >>
 238                                         n->sel.offshift;
 239                         }
 240                         off2 &= ~3;
 241                 }
 242                 if (n->sel.flags & TC_U32_EAT) {
 243                         off += off2;
 244                         off2 = 0;
 245                 }
 246
 247                 if (off < skb->len)
 248                         goto next_ht;
 249         }
 250
 251         /* POP */
 252         if (sdepth--) {
 253                 n = stack[sdepth].knode;
 254                 ht = rcu_dereference_bh(n->ht_up);
 255                 off = stack[sdepth].off;
 256                 goto check_terminal;
 257         }
 258 out:
 259         return -1;
 260
 261 deadloop:
 262         net_warn_ratelimited("cls_u32: dead loop\n");
 263         return -1;
 264 }
 265
 266 static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 267 {
 268         struct tc_u_hnode *ht;
 269
 270         for (ht = rtnl_dereference(tp_c->hlist);
 271              ht;
 272              ht = rtnl_dereference(ht->next))
 273                 if (ht->handle == handle)
 274                         break;
 275
 276         return ht;
 277 }
 278
 279 static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 280 {
 281         unsigned int sel;
 282         struct tc_u_knode *n = NULL;
 283
 284         sel = TC_U32_HASH(handle);
 285         if (sel > ht->divisor)
 286                 goto out;
 287
 288         for (n = rtnl_dereference(ht->ht[sel]);
 289              n;
 290              n = rtnl_dereference(n->next))
 291                 if (n->handle == handle)
 292                         break;
 293 out:
 294         return n;
 295 }
 296
 297
 298 static void *u32_get(struct tcf_proto *tp, u32 handle)
 299 {
 300         struct tc_u_hnode *ht;
 301         struct tc_u_common *tp_c = tp->data;
 302
 303         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 304                 ht = rtnl_dereference(tp->root);
 305         else
 306                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 307
 308         if (!ht)
 309                 return NULL;
 310
 311         if (TC_U32_KEY(handle) == 0)
 312                 return ht;
 313
 314         return u32_lookup_key(ht, handle);
 315 }
 316
 317 static u32 gen_new_htid(struct tc_u_common *tp_c)
 318 {
 319         int i = 0x800;
 320
 321         /* hgenerator only used inside rtnl lock it is safe to increment
 322          * without read _copy_ update semantics
 323          */
 324         do {
 325                 if (++tp_c->hgenerator == 0x7FF)
 326                         tp_c->hgenerator = 1;
 327         } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
 328
 329         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 330 }
 331
 332 static struct hlist_head *tc_u_common_hash;
 333
 334 #define U32_HASH_SHIFT 10
 335 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
 336
 337 static unsigned int tc_u_hash(const struct tcf_proto *tp)
 338 {
 339         struct net_device *dev = tp->q->dev_queue->dev;
 340         u32 qhandle = tp->q->handle;
 341         int ifindex = dev->ifindex;
 342
 343         return hash_64((u64)ifindex << 32 | qhandle, U32_HASH_SHIFT);
 344 }
 345
 346 static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
 347 {
 348         struct tc_u_common *tc;
 349         unsigned int h;
 350
 351         h = tc_u_hash(tp);
 352         hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
 353                 if (tc->q == tp->q)
 354                         return tc;
 355         }
 356         return NULL;
 357 }
 358
 359 static int u32_init(struct tcf_proto *tp)
 360 {
 361         struct tc_u_hnode *root_ht;
 362         struct tc_u_common *tp_c;
 363         unsigned int h;
 364
 365         tp_c = tc_u_common_find(tp);
 366
 367         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 368         if (root_ht == NULL)
 369                 return -ENOBUFS;
 370
 371         root_ht->refcnt++;
 372         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
 373         root_ht->prio = tp->prio;
 374
 375         if (tp_c == NULL) {
 376                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
 377                 if (tp_c == NULL) {
 378                         kfree(root_ht);
 379                         return -ENOBUFS;
 380                 }
 381                 tp_c->q = tp->q;
 382                 INIT_HLIST_NODE(&tp_c->hnode);
 383
 384                 h = tc_u_hash(tp);
 385                 hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
 386         }
 387
 388         tp_c->refcnt++;
 389         RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
 390         rcu_assign_pointer(tp_c->hlist, root_ht);
 391         root_ht->tp_c = tp_c;
 392
 393         rcu_assign_pointer(tp->root, root_ht);
 394         tp->data = tp_c;
 395         return 0;
 396 }
 397
 398 static void __u32_destroy_key(struct tc_u_knode *n)
 399 {
 400         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 401
 402         tcf_exts_destroy(&n->exts);
 403         if (ht && --ht->refcnt == 0)
 404                 kfree(ht);
 405         kfree(n);
 406 }
 407
 408 static void u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
 409                            bool free_pf)
 410 {
 411         tcf_exts_put_net(&n->exts);
 412 #ifdef CONFIG_CLS_U32_PERF
 413         if (free_pf)
 414                 free_percpu(n->pf);
 415 #endif
 416 #ifdef CONFIG_CLS_U32_MARK
 417         if (free_pf)
 418                 free_percpu(n->pcpu_success);
 419 #endif
 420         __u32_destroy_key(n);
 421 }
 422
 423 /* u32_delete_key_rcu should be called when free'ing a copied
 424  * version of a tc_u_knode obtained from u32_init_knode(). When
 425  * copies are obtained from u32_init_knode() the statistics are
 426  * shared between the old and new copies to allow readers to
 427  * continue to update the statistics during the copy. To support
 428  * this the u32_delete_key_rcu variant does not free the percpu
 429  * statistics.
 430  */
 431 static void u32_delete_key_work(struct work_struct *work)
 432 {
 433         struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
 434
 435         rtnl_lock();
 436         u32_destroy_key(key->tp, key, false);
 437         rtnl_unlock();
 438 }
 439
 440 static void u32_delete_key_rcu(struct rcu_head *rcu)
 441 {
 442         struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
 443
 444         INIT_WORK(&key->work, u32_delete_key_work);
 445         tcf_queue_work(&key->work);
 446 }
 447
 448 /* u32_delete_key_freepf_rcu is the rcu callback variant
 449  * that free's the entire structure including the statistics
 450  * percpu variables. Only use this if the key is not a copy
 451  * returned by u32_init_knode(). See u32_delete_key_rcu()
 452  * for the variant that should be used with keys return from
 453  * u32_init_knode()
 454  */
 455 static void u32_delete_key_freepf_work(struct work_struct *work)
 456 {
 457         struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
 458
 459         rtnl_lock();
 460         u32_destroy_key(key->tp, key, true);
 461         rtnl_unlock();
 462 }
 463
 464 static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
 465 {
 466         struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
 467
 468         INIT_WORK(&key->work, u32_delete_key_freepf_work);
 469         tcf_queue_work(&key->work);
 470 }
 471
 472 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
 473 {
 474         struct tc_u_knode __rcu **kp;
 475         struct tc_u_knode *pkp;
 476         struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
 477
 478         if (ht) {
 479                 kp = &ht->ht[TC_U32_HASH(key->handle)];
 480                 for (pkp = rtnl_dereference(*kp); pkp;
 481                      kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
 482                         if (pkp == key) {
 483                                 RCU_INIT_POINTER(*kp, key->next);
 484
 485                                 tcf_unbind_filter(tp, &key->res);
 486                                 tcf_exts_get_net(&key->exts);
 487                                 call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
 488                                 return 0;
 489                         }
 490                 }
 491         }
 492         WARN_ON(1);
 493         return 0;
 494 }
 495
 496 static void u32_remove_hw_knode(struct tcf_proto *tp, u32 handle)
 497 {
 498         struct net_device *dev = tp->q->dev_queue->dev;
 499         struct tc_cls_u32_offload cls_u32 = {};
 500
 501         if (!tc_should_offload(dev, 0))
 502                 return;
 503
 504         tc_cls_common_offload_init(&cls_u32.common, tp);
 505         cls_u32.command = TC_CLSU32_DELETE_KNODE;
 506         cls_u32.knode.handle = handle;
 507
 508         dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32);
 509 }
 510
 511 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 512                                 u32 flags)
 513 {
 514         struct net_device *dev = tp->q->dev_queue->dev;
 515         struct tc_cls_u32_offload cls_u32 = {};
 516         int err;
 517
 518         if (!tc_should_offload(dev, flags))
 519                 return tc_skip_sw(flags) ? -EINVAL : 0;
 520
 521         tc_cls_common_offload_init(&cls_u32.common, tp);
 522         cls_u32.command = TC_CLSU32_NEW_HNODE;
 523         cls_u32.hnode.divisor = h->divisor;
 524         cls_u32.hnode.handle = h->handle;
 525         cls_u32.hnode.prio = h->prio;
 526
 527         err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32);
 528         if (tc_skip_sw(flags))
 529                 return err;
 530
 531         return 0;
 532 }
 533
 534 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h)
 535 {
 536         struct net_device *dev = tp->q->dev_queue->dev;
 537         struct tc_cls_u32_offload cls_u32 = {};
 538
 539         if (!tc_should_offload(dev, 0))
 540                 return;
 541
 542         tc_cls_common_offload_init(&cls_u32.common, tp);
 543         cls_u32.command = TC_CLSU32_DELETE_HNODE;
 544         cls_u32.hnode.divisor = h->divisor;
 545         cls_u32.hnode.handle = h->handle;
 546         cls_u32.hnode.prio = h->prio;
 547
 548         dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32);
 549 }
 550
 551 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 552                                 u32 flags)
 553 {
 554         struct net_device *dev = tp->q->dev_queue->dev;
 555         struct tc_cls_u32_offload cls_u32 = {};
 556         int err;
 557
 558         if (!tc_should_offload(dev, flags))
 559                 return tc_skip_sw(flags) ? -EINVAL : 0;
 560
 561         tc_cls_common_offload_init(&cls_u32.common, tp);
 562         cls_u32.command = TC_CLSU32_REPLACE_KNODE;
 563         cls_u32.knode.handle = n->handle;
 564         cls_u32.knode.fshift = n->fshift;
 565 #ifdef CONFIG_CLS_U32_MARK
 566         cls_u32.knode.val = n->val;
 567         cls_u32.knode.mask = n->mask;
 568 #else
 569         cls_u32.knode.val = 0;
 570         cls_u32.knode.mask = 0;
 571 #endif
 572         cls_u32.knode.sel = &n->sel;
 573         cls_u32.knode.exts = &n->exts;
 574         if (n->ht_down)
 575                 cls_u32.knode.link_handle = n->ht_down->handle;
 576
 577         err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32);
 578
 579         if (!err)
 580                 n->flags |= TCA_CLS_FLAGS_IN_HW;
 581
 582         if (tc_skip_sw(flags))
 583                 return err;
 584
 585         return 0;
 586 }
 587
 588 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 589 {
 590         struct tc_u_knode *n;
 591         unsigned int h;
 592
 593         for (h = 0; h <= ht->divisor; h++) {
 594                 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
 595                         RCU_INIT_POINTER(ht->ht[h],
 596                                          rtnl_dereference(n->next));
 597                         tcf_unbind_filter(tp, &n->res);
 598                         u32_remove_hw_knode(tp, n->handle);
 599                         if (tcf_exts_get_net(&n->exts))
 600                                 call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
 601                         else
 602                                 u32_destroy_key(n->tp, n, true);
 603                 }
 604         }
 605 }
 606
 607 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 608 {
 609         struct tc_u_common *tp_c = tp->data;
 610         struct tc_u_hnode __rcu **hn;
 611         struct tc_u_hnode *phn;
 612
 613         WARN_ON(ht->refcnt);
 614
 615         u32_clear_hnode(tp, ht);
 616
 617         hn = &tp_c->hlist;
 618         for (phn = rtnl_dereference(*hn);
 619              phn;
 620              hn = &phn->next, phn = rtnl_dereference(*hn)) {
 621                 if (phn == ht) {
 622                         u32_clear_hw_hnode(tp, ht);
 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)
 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);
 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);
 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                 kfree(tp_c);
 670         }
 671
 672         tp->data = NULL;
 673 }
 674
 675 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last)
 676 {
 677         struct tc_u_hnode *ht = arg;
 678         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 679         struct tc_u_common *tp_c = tp->data;
 680         int ret = 0;
 681
 682         if (ht == NULL)
 683                 goto out;
 684
 685         if (TC_U32_KEY(ht->handle)) {
 686                 u32_remove_hw_knode(tp, ht->handle);
 687                 ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
 688                 goto out;
 689         }
 690
 691         if (root_ht == ht)
 692                 return -EINVAL;
 693
 694         if (ht->refcnt == 1) {
 695                 ht->refcnt--;
 696                 u32_destroy_hnode(tp, ht);
 697         } else {
 698                 return -EBUSY;
 699         }
 700
 701 out:
 702         *last = true;
 703         if (root_ht) {
 704                 if (root_ht->refcnt > 1) {
 705                         *last = false;
 706                         goto ret;
 707                 }
 708                 if (root_ht->refcnt == 1) {
 709                         if (!ht_empty(root_ht)) {
 710                                 *last = false;
 711                                 goto ret;
 712                         }
 713                 }
 714         }
 715
 716         if (tp_c->refcnt > 1) {
 717                 *last = false;
 718                 goto ret;
 719         }
 720
 721         if (tp_c->refcnt == 1) {
 722                 struct tc_u_hnode *ht;
 723
 724                 for (ht = rtnl_dereference(tp_c->hlist);
 725                      ht;
 726                      ht = rtnl_dereference(ht->next))
 727                         if (!ht_empty(ht)) {
 728                                 *last = false;
 729                                 break;
 730                         }
 731         }
 732
 733 ret:
 734         return ret;
 735 }
 736
 737 #define NR_U32_NODE (1<<12)
 738 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
 739 {
 740         struct tc_u_knode *n;
 741         unsigned long i;
 742         unsigned long *bitmap = kzalloc(BITS_TO_LONGS(NR_U32_NODE) * sizeof(unsigned long),
 743                                         GFP_KERNEL);
 744         if (!bitmap)
 745                 return handle | 0xFFF;
 746
 747         for (n = rtnl_dereference(ht->ht[TC_U32_HASH(handle)]);
 748              n;
 749              n = rtnl_dereference(n->next))
 750                 set_bit(TC_U32_NODE(n->handle), bitmap);
 751
 752         i = find_next_zero_bit(bitmap, NR_U32_NODE, 0x800);
 753         if (i >= NR_U32_NODE)
 754                 i = find_next_zero_bit(bitmap, NR_U32_NODE, 1);
 755
 756         kfree(bitmap);
 757         return handle | (i >= NR_U32_NODE ? 0xFFF : i);
 758 }
 759
 760 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 761         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 762         [TCA_U32_HASH]          = { .type = NLA_U32 },
 763         [TCA_U32_LINK]          = { .type = NLA_U32 },
 764         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 765         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 766         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 767         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 768         [TCA_U32_FLAGS]         = { .type = NLA_U32 },
 769 };
 770
 771 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 772                          unsigned long base, struct tc_u_hnode *ht,
 773                          struct tc_u_knode *n, struct nlattr **tb,
 774                          struct nlattr *est, bool ovr)
 775 {
 776         int err;
 777
 778         err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr);
 779         if (err < 0)
 780                 return err;
 781
 782         if (tb[TCA_U32_LINK]) {
 783                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 784                 struct tc_u_hnode *ht_down = NULL, *ht_old;
 785
 786                 if (TC_U32_KEY(handle))
 787                         return -EINVAL;
 788
 789                 if (handle) {
 790                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 791
 792                         if (ht_down == NULL)
 793                                 return -EINVAL;
 794                         ht_down->refcnt++;
 795                 }
 796
 797                 ht_old = rtnl_dereference(n->ht_down);
 798                 rcu_assign_pointer(n->ht_down, ht_down);
 799
 800                 if (ht_old)
 801                         ht_old->refcnt--;
 802         }
 803         if (tb[TCA_U32_CLASSID]) {
 804                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 805                 tcf_bind_filter(tp, &n->res, base);
 806         }
 807
 808 #ifdef CONFIG_NET_CLS_IND
 809         if (tb[TCA_U32_INDEV]) {
 810                 int ret;
 811                 ret = tcf_change_indev(net, tb[TCA_U32_INDEV]);
 812                 if (ret < 0)
 813                         return -EINVAL;
 814                 n->ifindex = ret;
 815         }
 816 #endif
 817         return 0;
 818 }
 819
 820 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
 821                               struct tc_u_knode *n)
 822 {
 823         struct tc_u_knode __rcu **ins;
 824         struct tc_u_knode *pins;
 825         struct tc_u_hnode *ht;
 826
 827         if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
 828                 ht = rtnl_dereference(tp->root);
 829         else
 830                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
 831
 832         ins = &ht->ht[TC_U32_HASH(n->handle)];
 833
 834         /* The node must always exist for it to be replaced if this is not the
 835          * case then something went very wrong elsewhere.
 836          */
 837         for (pins = rtnl_dereference(*ins); ;
 838              ins = &pins->next, pins = rtnl_dereference(*ins))
 839                 if (pins->handle == n->handle)
 840                         break;
 841
 842         RCU_INIT_POINTER(n->next, pins->next);
 843         rcu_assign_pointer(*ins, n);
 844 }
 845
 846 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
 847                                          struct tc_u_knode *n)
 848 {
 849         struct tc_u_knode *new;
 850         struct tc_u32_sel *s = &n->sel;
 851
 852         new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
 853                       GFP_KERNEL);
 854
 855         if (!new)
 856                 return NULL;
 857
 858         RCU_INIT_POINTER(new->next, n->next);
 859         new->handle = n->handle;
 860         RCU_INIT_POINTER(new->ht_up, n->ht_up);
 861
 862 #ifdef CONFIG_NET_CLS_IND
 863         new->ifindex = n->ifindex;
 864 #endif
 865         new->fshift = n->fshift;
 866         new->res = n->res;
 867         new->flags = n->flags;
 868         RCU_INIT_POINTER(new->ht_down, n->ht_down);
 869
 870         /* bump reference count as long as we hold pointer to structure */
 871         if (new->ht_down)
 872                 new->ht_down->refcnt++;
 873
 874 #ifdef CONFIG_CLS_U32_PERF
 875         /* Statistics may be incremented by readers during update
 876          * so we must keep them in tact. When the node is later destroyed
 877          * a special destroy call must be made to not free the pf memory.
 878          */
 879         new->pf = n->pf;
 880 #endif
 881
 882 #ifdef CONFIG_CLS_U32_MARK
 883         new->val = n->val;
 884         new->mask = n->mask;
 885         /* Similarly success statistics must be moved as pointers */
 886         new->pcpu_success = n->pcpu_success;
 887 #endif
 888         new->tp = tp;
 889         memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 890
 891         if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
 892                 kfree(new);
 893                 return NULL;
 894         }
 895
 896         return new;
 897 }
 898
 899 static int u32_change(struct net *net, struct sk_buff *in_skb,
 900                       struct tcf_proto *tp, unsigned long base, u32 handle,
 901                       struct nlattr **tca, void **arg, bool ovr)
 902 {
 903         struct tc_u_common *tp_c = tp->data;
 904         struct tc_u_hnode *ht;
 905         struct tc_u_knode *n;
 906         struct tc_u32_sel *s;
 907         struct nlattr *opt = tca[TCA_OPTIONS];
 908         struct nlattr *tb[TCA_U32_MAX + 1];
 909         u32 htid, flags = 0;
 910         size_t sel_size;
 911         int err;
 912 #ifdef CONFIG_CLS_U32_PERF
 913         size_t size;
 914 #endif
 915
 916         if (opt == NULL)
 917                 return handle ? -EINVAL : 0;
 918
 919         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, NULL);
 920         if (err < 0)
 921                 return err;
 922
 923         if (tb[TCA_U32_FLAGS]) {
 924                 flags = nla_get_u32(tb[TCA_U32_FLAGS]);
 925                 if (!tc_flags_valid(flags))
 926                         return -EINVAL;
 927         }
 928
 929         n = *arg;
 930         if (n) {
 931                 struct tc_u_knode *new;
 932
 933                 if (TC_U32_KEY(n->handle) == 0)
 934                         return -EINVAL;
 935
 936                 if ((n->flags ^ flags) &
 937                     ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW))
 938                         return -EINVAL;
 939
 940                 new = u32_init_knode(tp, n);
 941                 if (!new)
 942                         return -ENOMEM;
 943
 944                 err = u32_set_parms(net, tp, base,
 945                                     rtnl_dereference(n->ht_up), new, tb,
 946                                     tca[TCA_RATE], ovr);
 947
 948                 if (err) {
 949                         __u32_destroy_key(new);
 950                         return err;
 951                 }
 952
 953                 err = u32_replace_hw_knode(tp, new, flags);
 954                 if (err) {
 955                         __u32_destroy_key(new);
 956                         return err;
 957                 }
 958
 959                 if (!tc_in_hw(new->flags))
 960                         new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 961
 962                 u32_replace_knode(tp, tp_c, new);
 963                 tcf_unbind_filter(tp, &n->res);
 964                 tcf_exts_get_net(&n->exts);
 965                 call_rcu(&n->rcu, u32_delete_key_rcu);
 966                 return 0;
 967         }
 968
 969         if (tb[TCA_U32_DIVISOR]) {
 970                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 971
 972                 if (--divisor > 0x100)
 973                         return -EINVAL;
 974                 if (TC_U32_KEY(handle))
 975                         return -EINVAL;
 976                 if (handle == 0) {
 977                         handle = gen_new_htid(tp->data);
 978                         if (handle == 0)
 979                                 return -ENOMEM;
 980                 }
 981                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
 982                 if (ht == NULL)
 983                         return -ENOBUFS;
 984                 ht->tp_c = tp_c;
 985                 ht->refcnt = 1;
 986                 ht->divisor = divisor;
 987                 ht->handle = handle;
 988                 ht->prio = tp->prio;
 989
 990                 err = u32_replace_hw_hnode(tp, ht, flags);
 991                 if (err) {
 992                         kfree(ht);
 993                         return err;
 994                 }
 995
 996                 RCU_INIT_POINTER(ht->next, tp_c->hlist);
 997                 rcu_assign_pointer(tp_c->hlist, ht);
 998                 *arg = ht;
 999
1000                 return 0;
1001         }
1002
1003         if (tb[TCA_U32_HASH]) {
1004                 htid = nla_get_u32(tb[TCA_U32_HASH]);
1005                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
1006                         ht = rtnl_dereference(tp->root);
1007                         htid = ht->handle;
1008                 } else {
1009                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
1010                         if (ht == NULL)
1011                                 return -EINVAL;
1012                 }
1013         } else {
1014                 ht = rtnl_dereference(tp->root);
1015                 htid = ht->handle;
1016         }
1017
1018         if (ht->divisor < TC_U32_HASH(htid))
1019                 return -EINVAL;
1020
1021         if (handle) {
1022                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
1023                         return -EINVAL;
1024                 handle = htid | TC_U32_NODE(handle);
1025         } else
1026                 handle = gen_new_kid(ht, htid);
1027
1028         if (tb[TCA_U32_SEL] == NULL)
1029                 return -EINVAL;
1030
1031         s = nla_data(tb[TCA_U32_SEL]);
1032         sel_size = sizeof(*s) + sizeof(*s->keys) * s->nkeys;
1033         if (nla_len(tb[TCA_U32_SEL]) < sel_size)
1034                 return -EINVAL;
1035
1036         n = kzalloc(offsetof(typeof(*n), sel) + sel_size, GFP_KERNEL);
1037         if (n == NULL)
1038                 return -ENOBUFS;
1039
1040 #ifdef CONFIG_CLS_U32_PERF
1041         size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1042         n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1043         if (!n->pf) {
1044                 kfree(n);
1045                 return -ENOBUFS;
1046         }
1047 #endif
1048
1049         memcpy(&n->sel, s, sel_size);
1050         RCU_INIT_POINTER(n->ht_up, ht);
1051         n->handle = handle;
1052         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1053         n->flags = flags;
1054         n->tp = tp;
1055
1056         err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1057         if (err < 0)
1058                 goto errout;
1059
1060 #ifdef CONFIG_CLS_U32_MARK
1061         n->pcpu_success = alloc_percpu(u32);
1062         if (!n->pcpu_success) {
1063                 err = -ENOMEM;
1064                 goto errout;
1065         }
1066
1067         if (tb[TCA_U32_MARK]) {
1068                 struct tc_u32_mark *mark;
1069
1070                 mark = nla_data(tb[TCA_U32_MARK]);
1071                 n->val = mark->val;
1072                 n->mask = mark->mask;
1073         }
1074 #endif
1075
1076         err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr);
1077         if (err == 0) {
1078                 struct tc_u_knode __rcu **ins;
1079                 struct tc_u_knode *pins;
1080
1081                 err = u32_replace_hw_knode(tp, n, flags);
1082                 if (err)
1083                         goto errhw;
1084
1085                 if (!tc_in_hw(n->flags))
1086                         n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1087
1088                 ins = &ht->ht[TC_U32_HASH(handle)];
1089                 for (pins = rtnl_dereference(*ins); pins;
1090                      ins = &pins->next, pins = rtnl_dereference(*ins))
1091                         if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1092                                 break;
1093
1094                 RCU_INIT_POINTER(n->next, pins);
1095                 rcu_assign_pointer(*ins, n);
1096                 *arg = n;
1097                 return 0;
1098         }
1099
1100 errhw:
1101 #ifdef CONFIG_CLS_U32_MARK
1102         free_percpu(n->pcpu_success);
1103 #endif
1104
1105 errout:
1106         tcf_exts_destroy(&n->exts);
1107 #ifdef CONFIG_CLS_U32_PERF
1108         free_percpu(n->pf);
1109 #endif
1110         kfree(n);
1111         return err;
1112 }
1113
1114 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1115 {
1116         struct tc_u_common *tp_c = tp->data;
1117         struct tc_u_hnode *ht;
1118         struct tc_u_knode *n;
1119         unsigned int h;
1120
1121         if (arg->stop)
1122                 return;
1123
1124         for (ht = rtnl_dereference(tp_c->hlist);
1125              ht;
1126              ht = rtnl_dereference(ht->next)) {
1127                 if (ht->prio != tp->prio)
1128                         continue;
1129                 if (arg->count >= arg->skip) {
1130                         if (arg->fn(tp, ht, arg) < 0) {
1131                                 arg->stop = 1;
1132                                 return;
1133                         }
1134                 }
1135                 arg->count++;
1136                 for (h = 0; h <= ht->divisor; h++) {
1137                         for (n = rtnl_dereference(ht->ht[h]);
1138                              n;
1139                              n = rtnl_dereference(n->next)) {
1140                                 if (arg->count < arg->skip) {
1141                                         arg->count++;
1142                                         continue;
1143                                 }
1144                                 if (arg->fn(tp, n, arg) < 0) {
1145                                         arg->stop = 1;
1146                                         return;
1147                                 }
1148                                 arg->count++;
1149                         }
1150                 }
1151         }
1152 }
1153
1154 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1155 {
1156         struct tc_u_knode *n = fh;
1157
1158         if (n && n->res.classid == classid)
1159                 n->res.class = cl;
1160 }
1161
1162 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1163                     struct sk_buff *skb, struct tcmsg *t)
1164 {
1165         struct tc_u_knode *n = fh;
1166         struct tc_u_hnode *ht_up, *ht_down;
1167         struct nlattr *nest;
1168
1169         if (n == NULL)
1170                 return skb->len;
1171
1172         t->tcm_handle = n->handle;
1173
1174         nest = nla_nest_start(skb, TCA_OPTIONS);
1175         if (nest == NULL)
1176                 goto nla_put_failure;
1177
1178         if (TC_U32_KEY(n->handle) == 0) {
1179                 struct tc_u_hnode *ht = fh;
1180                 u32 divisor = ht->divisor + 1;
1181
1182                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1183                         goto nla_put_failure;
1184         } else {
1185 #ifdef CONFIG_CLS_U32_PERF
1186                 struct tc_u32_pcnt *gpf;
1187                 int cpu;
1188 #endif
1189
1190                 if (nla_put(skb, TCA_U32_SEL,
1191                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1192                             &n->sel))
1193                         goto nla_put_failure;
1194
1195                 ht_up = rtnl_dereference(n->ht_up);
1196                 if (ht_up) {
1197                         u32 htid = n->handle & 0xFFFFF000;
1198                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
1199                                 goto nla_put_failure;
1200                 }
1201                 if (n->res.classid &&
1202                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1203                         goto nla_put_failure;
1204
1205                 ht_down = rtnl_dereference(n->ht_down);
1206                 if (ht_down &&
1207                     nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1208                         goto nla_put_failure;
1209
1210                 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1211                         goto nla_put_failure;
1212
1213 #ifdef CONFIG_CLS_U32_MARK
1214                 if ((n->val || n->mask)) {
1215                         struct tc_u32_mark mark = {.val = n->val,
1216                                                    .mask = n->mask,
1217                                                    .success = 0};
1218                         int cpum;
1219
1220                         for_each_possible_cpu(cpum) {
1221                                 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1222
1223                                 mark.success += cnt;
1224                         }
1225
1226                         if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1227                                 goto nla_put_failure;
1228                 }
1229 #endif
1230
1231                 if (tcf_exts_dump(skb, &n->exts) < 0)
1232                         goto nla_put_failure;
1233
1234 #ifdef CONFIG_NET_CLS_IND
1235                 if (n->ifindex) {
1236                         struct net_device *dev;
1237                         dev = __dev_get_by_index(net, n->ifindex);
1238                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1239                                 goto nla_put_failure;
1240                 }
1241 #endif
1242 #ifdef CONFIG_CLS_U32_PERF
1243                 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1244                               n->sel.nkeys * sizeof(u64),
1245                               GFP_KERNEL);
1246                 if (!gpf)
1247                         goto nla_put_failure;
1248
1249                 for_each_possible_cpu(cpu) {
1250                         int i;
1251                         struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1252
1253                         gpf->rcnt += pf->rcnt;
1254                         gpf->rhit += pf->rhit;
1255                         for (i = 0; i < n->sel.nkeys; i++)
1256                                 gpf->kcnts[i] += pf->kcnts[i];
1257                 }
1258
1259                 if (nla_put_64bit(skb, TCA_U32_PCNT,
1260                                   sizeof(struct tc_u32_pcnt) +
1261                                   n->sel.nkeys * sizeof(u64),
1262                                   gpf, TCA_U32_PAD)) {
1263                         kfree(gpf);
1264                         goto nla_put_failure;
1265                 }
1266                 kfree(gpf);
1267 #endif
1268         }
1269
1270         nla_nest_end(skb, nest);
1271
1272         if (TC_U32_KEY(n->handle))
1273                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1274                         goto nla_put_failure;
1275         return skb->len;
1276
1277 nla_put_failure:
1278         nla_nest_cancel(skb, nest);
1279         return -1;
1280 }
1281
1282 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1283         .kind           =       "u32",
1284         .classify       =       u32_classify,
1285         .init           =       u32_init,
1286         .destroy        =       u32_destroy,
1287         .get            =       u32_get,
1288         .change         =       u32_change,
1289         .delete         =       u32_delete,
1290         .walk           =       u32_walk,
1291         .dump           =       u32_dump,
1292         .bind_class     =       u32_bind_class,
1293         .owner          =       THIS_MODULE,
1294 };
1295
1296 static int __init init_u32(void)
1297 {
1298         int i, ret;
1299
1300         pr_info("u32 classifier\n");
1301 #ifdef CONFIG_CLS_U32_PERF
1302         pr_info("    Performance counters on\n");
1303 #endif
1304 #ifdef CONFIG_NET_CLS_IND
1305         pr_info("    input device check on\n");
1306 #endif
1307 #ifdef CONFIG_NET_CLS_ACT
1308         pr_info("    Actions configured\n");
1309 #endif
1310         tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1311                                           sizeof(struct hlist_head),
1312                                           GFP_KERNEL);
1313         if (!tc_u_common_hash)
1314                 return -ENOMEM;
1315
1316         for (i = 0; i < U32_HASH_SIZE; i++)
1317                 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1318
1319         ret = register_tcf_proto_ops(&cls_u32_ops);
1320         if (ret)
1321                 kvfree(tc_u_common_hash);
1322         return ret;
1323 }
1324
1325 static void __exit exit_u32(void)
1326 {
1327         unregister_tcf_proto_ops(&cls_u32_ops);
1328         kvfree(tc_u_common_hash);
1329 }
1330
1331 module_init(init_u32)
1332 module_exit(exit_u32)
1333 MODULE_LICENSE("GPL");