net/sched/cls_u32.c

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