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