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 static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
 320 {
 321         unsigned long idr_index;
 322         int err;
 323
 324         /* This is only used inside rtnl lock it is safe to increment
 325          * without read _copy_ update semantics
 326          */
 327         err = idr_alloc_ext(&tp_c->handle_idr, ptr, &idr_index,
 328                             1, 0x7FF, GFP_KERNEL);
 329         if (err)
 330                 return 0;
 331         return (u32)(idr_index | 0x800) << 20;
 332 }
 333
 334 static struct hlist_head *tc_u_common_hash;
 335
 336 #define U32_HASH_SHIFT 10
 337 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
 338
 339 static unsigned int tc_u_hash(const struct tcf_proto *tp)
 340 {
 341         return hash_ptr(tp->chain->block, U32_HASH_SHIFT);
 342 }
 343
 344 static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
 345 {
 346         struct tc_u_common *tc;
 347         unsigned int h;
 348
 349         h = tc_u_hash(tp);
 350         hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
 351                 if (tc->block == tp->chain->block)
 352                         return tc;
 353         }
 354         return NULL;
 355 }
 356
 357 static int u32_init(struct tcf_proto *tp)
 358 {
 359         struct tc_u_hnode *root_ht;
 360         struct tc_u_common *tp_c;
 361         unsigned int h;
 362
 363         tp_c = tc_u_common_find(tp);
 364
 365         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 366         if (root_ht == NULL)
 367                 return -ENOBUFS;
 368
 369         root_ht->refcnt++;
 370         root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
 371         root_ht->prio = tp->prio;
 372         idr_init(&root_ht->handle_idr);
 373
 374         if (tp_c == NULL) {
 375                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
 376                 if (tp_c == NULL) {
 377                         kfree(root_ht);
 378                         return -ENOBUFS;
 379                 }
 380                 tp_c->block = tp->chain->block;
 381                 INIT_HLIST_NODE(&tp_c->hnode);
 382                 idr_init(&tp_c->handle_idr);
 383
 384                 h = tc_u_hash(tp);
 385                 hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
 386         }
 387
 388         tp_c->refcnt++;
 389         RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
 390         rcu_assign_pointer(tp_c->hlist, root_ht);
 391         root_ht->tp_c = tp_c;
 392
 393         rcu_assign_pointer(tp->root, root_ht);
 394         tp->data = tp_c;
 395         return 0;
 396 }
 397
 398 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
 399                            bool free_pf)
 400 {
 401         tcf_exts_destroy(&n->exts);
 402         tcf_exts_put_net(&n->exts);
 403         if (n->ht_down)
 404                 n->ht_down->refcnt--;
 405 #ifdef CONFIG_CLS_U32_PERF
 406         if (free_pf)
 407                 free_percpu(n->pf);
 408 #endif
 409 #ifdef CONFIG_CLS_U32_MARK
 410         if (free_pf)
 411                 free_percpu(n->pcpu_success);
 412 #endif
 413         kfree(n);
 414         return 0;
 415 }
 416
 417 /* u32_delete_key_rcu should be called when free'ing a copied
 418  * version of a tc_u_knode obtained from u32_init_knode(). When
 419  * copies are obtained from u32_init_knode() the statistics are
 420  * shared between the old and new copies to allow readers to
 421  * continue to update the statistics during the copy. To support
 422  * this the u32_delete_key_rcu variant does not free the percpu
 423  * statistics.
 424  */
 425 static void u32_delete_key_work(struct work_struct *work)
 426 {
 427         struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
 428
 429         rtnl_lock();
 430         u32_destroy_key(key->tp, key, false);
 431         rtnl_unlock();
 432 }
 433
 434 static void u32_delete_key_rcu(struct rcu_head *rcu)
 435 {
 436         struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
 437
 438         INIT_WORK(&key->work, u32_delete_key_work);
 439         tcf_queue_work(&key->work);
 440 }
 441
 442 /* u32_delete_key_freepf_rcu is the rcu callback variant
 443  * that free's the entire structure including the statistics
 444  * percpu variables. Only use this if the key is not a copy
 445  * returned by u32_init_knode(). See u32_delete_key_rcu()
 446  * for the variant that should be used with keys return from
 447  * u32_init_knode()
 448  */
 449 static void u32_delete_key_freepf_work(struct work_struct *work)
 450 {
 451         struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
 452
 453         rtnl_lock();
 454         u32_destroy_key(key->tp, key, true);
 455         rtnl_unlock();
 456 }
 457
 458 static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
 459 {
 460         struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
 461
 462         INIT_WORK(&key->work, u32_delete_key_freepf_work);
 463         tcf_queue_work(&key->work);
 464 }
 465
 466 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
 467 {
 468         struct tc_u_knode __rcu **kp;
 469         struct tc_u_knode *pkp;
 470         struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
 471
 472         if (ht) {
 473                 kp = &ht->ht[TC_U32_HASH(key->handle)];
 474                 for (pkp = rtnl_dereference(*kp); pkp;
 475                      kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
 476                         if (pkp == key) {
 477                                 RCU_INIT_POINTER(*kp, key->next);
 478
 479                                 tcf_unbind_filter(tp, &key->res);
 480                                 tcf_exts_get_net(&key->exts);
 481                                 call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
 482                                 return 0;
 483                         }
 484                 }
 485         }
 486         WARN_ON(1);
 487         return 0;
 488 }
 489
 490 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 491                                struct netlink_ext_ack *extack)
 492 {
 493         struct tcf_block *block = tp->chain->block;
 494         struct tc_cls_u32_offload cls_u32 = {};
 495
 496         tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
 497         cls_u32.command = TC_CLSU32_DELETE_HNODE;
 498         cls_u32.hnode.divisor = h->divisor;
 499         cls_u32.hnode.handle = h->handle;
 500         cls_u32.hnode.prio = h->prio;
 501
 502         tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
 503 }
 504
 505 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 506                                 u32 flags, struct netlink_ext_ack *extack)
 507 {
 508         struct tcf_block *block = tp->chain->block;
 509         struct tc_cls_u32_offload cls_u32 = {};
 510         bool skip_sw = tc_skip_sw(flags);
 511         bool offloaded = false;
 512         int err;
 513
 514         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 515         cls_u32.command = TC_CLSU32_NEW_HNODE;
 516         cls_u32.hnode.divisor = h->divisor;
 517         cls_u32.hnode.handle = h->handle;
 518         cls_u32.hnode.prio = h->prio;
 519
 520         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 521         if (err < 0) {
 522                 u32_clear_hw_hnode(tp, h, NULL);
 523                 return err;
 524         } else if (err > 0) {
 525                 offloaded = true;
 526         }
 527
 528         if (skip_sw && !offloaded)
 529                 return -EINVAL;
 530
 531         return 0;
 532 }
 533
 534 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 535                                 struct netlink_ext_ack *extack)
 536 {
 537         struct tcf_block *block = tp->chain->block;
 538         struct tc_cls_u32_offload cls_u32 = {};
 539
 540         tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
 541         cls_u32.command = TC_CLSU32_DELETE_KNODE;
 542         cls_u32.knode.handle = n->handle;
 543
 544         tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
 545         tcf_block_offload_dec(block, &n->flags);
 546 }
 547
 548 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 549                                 u32 flags, struct netlink_ext_ack *extack)
 550 {
 551         struct tcf_block *block = tp->chain->block;
 552         struct tc_cls_u32_offload cls_u32 = {};
 553         bool skip_sw = tc_skip_sw(flags);
 554         int err;
 555
 556         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 557         cls_u32.command = TC_CLSU32_REPLACE_KNODE;
 558         cls_u32.knode.handle = n->handle;
 559         cls_u32.knode.fshift = n->fshift;
 560 #ifdef CONFIG_CLS_U32_MARK
 561         cls_u32.knode.val = n->val;
 562         cls_u32.knode.mask = n->mask;
 563 #else
 564         cls_u32.knode.val = 0;
 565         cls_u32.knode.mask = 0;
 566 #endif
 567         cls_u32.knode.sel = &n->sel;
 568         cls_u32.knode.exts = &n->exts;
 569         if (n->ht_down)
 570                 cls_u32.knode.link_handle = n->ht_down->handle;
 571
 572         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 573         if (err < 0) {
 574                 u32_remove_hw_knode(tp, n, NULL);
 575                 return err;
 576         } else if (err > 0) {
 577                 tcf_block_offload_inc(block, &n->flags);
 578         }
 579
 580         if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
 581                 return -EINVAL;
 582
 583         return 0;
 584 }
 585
 586 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 587                             struct netlink_ext_ack *extack)
 588 {
 589         struct tc_u_knode *n;
 590         unsigned int h;
 591
 592         for (h = 0; h <= ht->divisor; h++) {
 593                 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
 594                         RCU_INIT_POINTER(ht->ht[h],
 595                                          rtnl_dereference(n->next));
 596                         tcf_unbind_filter(tp, &n->res);
 597                         u32_remove_hw_knode(tp, n, extack);
 598                         idr_remove_ext(&ht->handle_idr, n->handle);
 599                         if (tcf_exts_get_net(&n->exts))
 600                                 call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
 601                         else
 602                                 u32_destroy_key(n->tp, n, true);
 603                 }
 604         }
 605 }
 606
 607 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 608                              struct netlink_ext_ack *extack)
 609 {
 610         struct tc_u_common *tp_c = tp->data;
 611         struct tc_u_hnode __rcu **hn;
 612         struct tc_u_hnode *phn;
 613
 614         WARN_ON(ht->refcnt);
 615
 616         u32_clear_hnode(tp, ht, extack);
 617
 618         hn = &tp_c->hlist;
 619         for (phn = rtnl_dereference(*hn);
 620              phn;
 621              hn = &phn->next, phn = rtnl_dereference(*hn)) {
 622                 if (phn == ht) {
 623                         u32_clear_hw_hnode(tp, ht, extack);
 624                         idr_destroy(&ht->handle_idr);
 625                         idr_remove_ext(&tp_c->handle_idr, ht->handle);
 626                         RCU_INIT_POINTER(*hn, ht->next);
 627                         kfree_rcu(ht, rcu);
 628                         return 0;
 629                 }
 630         }
 631
 632         return -ENOENT;
 633 }
 634
 635 static bool ht_empty(struct tc_u_hnode *ht)
 636 {
 637         unsigned int h;
 638
 639         for (h = 0; h <= ht->divisor; h++)
 640                 if (rcu_access_pointer(ht->ht[h]))
 641                         return false;
 642
 643         return true;
 644 }
 645
 646 static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 647 {
 648         struct tc_u_common *tp_c = tp->data;
 649         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 650
 651         WARN_ON(root_ht == NULL);
 652
 653         if (root_ht && --root_ht->refcnt == 0)
 654                 u32_destroy_hnode(tp, root_ht, extack);
 655
 656         if (--tp_c->refcnt == 0) {
 657                 struct tc_u_hnode *ht;
 658
 659                 hlist_del(&tp_c->hnode);
 660
 661                 for (ht = rtnl_dereference(tp_c->hlist);
 662                      ht;
 663                      ht = rtnl_dereference(ht->next)) {
 664                         ht->refcnt--;
 665                         u32_clear_hnode(tp, ht, extack);
 666                 }
 667
 668                 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
 669                         RCU_INIT_POINTER(tp_c->hlist, ht->next);
 670                         kfree_rcu(ht, rcu);
 671                 }
 672
 673                 idr_destroy(&tp_c->handle_idr);
 674                 kfree(tp_c);
 675         }
 676
 677         tp->data = NULL;
 678 }
 679
 680 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
 681                       struct netlink_ext_ack *extack)
 682 {
 683         struct tc_u_hnode *ht = arg;
 684         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 685         struct tc_u_common *tp_c = tp->data;
 686         int ret = 0;
 687
 688         if (ht == NULL)
 689                 goto out;
 690
 691         if (TC_U32_KEY(ht->handle)) {
 692                 u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
 693                 ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
 694                 goto out;
 695         }
 696
 697         if (root_ht == ht) {
 698                 NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
 699                 return -EINVAL;
 700         }
 701
 702         if (ht->refcnt == 1) {
 703                 ht->refcnt--;
 704                 u32_destroy_hnode(tp, ht, extack);
 705         } else {
 706                 NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
 707                 return -EBUSY;
 708         }
 709
 710 out:
 711         *last = true;
 712         if (root_ht) {
 713                 if (root_ht->refcnt > 1) {
 714                         *last = false;
 715                         goto ret;
 716                 }
 717                 if (root_ht->refcnt == 1) {
 718                         if (!ht_empty(root_ht)) {
 719                                 *last = false;
 720                                 goto ret;
 721                         }
 722                 }
 723         }
 724
 725         if (tp_c->refcnt > 1) {
 726                 *last = false;
 727                 goto ret;
 728         }
 729
 730         if (tp_c->refcnt == 1) {
 731                 struct tc_u_hnode *ht;
 732
 733                 for (ht = rtnl_dereference(tp_c->hlist);
 734                      ht;
 735                      ht = rtnl_dereference(ht->next))
 736                         if (!ht_empty(ht)) {
 737                                 *last = false;
 738                                 break;
 739                         }
 740         }
 741
 742 ret:
 743         return ret;
 744 }
 745
 746 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
 747 {
 748         unsigned long idr_index;
 749         u32 start = htid | 0x800;
 750         u32 max = htid | 0xFFF;
 751         u32 min = htid;
 752
 753         if (idr_alloc_ext(&ht->handle_idr, NULL, &idr_index,
 754                           start, max + 1, GFP_KERNEL)) {
 755                 if (idr_alloc_ext(&ht->handle_idr, NULL, &idr_index,
 756                                   min + 1, max + 1, GFP_KERNEL))
 757                         return max;
 758         }
 759
 760         return (u32)idr_index;
 761 }
 762
 763 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 764         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 765         [TCA_U32_HASH]          = { .type = NLA_U32 },
 766         [TCA_U32_LINK]          = { .type = NLA_U32 },
 767         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 768         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 769         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 770         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 771         [TCA_U32_FLAGS]         = { .type = NLA_U32 },
 772 };
 773
 774 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 775                          unsigned long base, struct tc_u_hnode *ht,
 776                          struct tc_u_knode *n, struct nlattr **tb,
 777                          struct nlattr *est, bool ovr,
 778                          struct netlink_ext_ack *extack)
 779 {
 780         int err;
 781
 782         err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
 783         if (err < 0)
 784                 return err;
 785
 786         if (tb[TCA_U32_LINK]) {
 787                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 788                 struct tc_u_hnode *ht_down = NULL, *ht_old;
 789
 790                 if (TC_U32_KEY(handle)) {
 791                         NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
 792                         return -EINVAL;
 793                 }
 794
 795                 if (handle) {
 796                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 797
 798                         if (!ht_down) {
 799                                 NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
 800                                 return -EINVAL;
 801                         }
 802                         ht_down->refcnt++;
 803                 }
 804
 805                 ht_old = rtnl_dereference(n->ht_down);
 806                 rcu_assign_pointer(n->ht_down, ht_down);
 807
 808                 if (ht_old)
 809                         ht_old->refcnt--;
 810         }
 811         if (tb[TCA_U32_CLASSID]) {
 812                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 813                 tcf_bind_filter(tp, &n->res, base);
 814         }
 815
 816 #ifdef CONFIG_NET_CLS_IND
 817         if (tb[TCA_U32_INDEV]) {
 818                 int ret;
 819                 ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
 820                 if (ret < 0)
 821                         return -EINVAL;
 822                 n->ifindex = ret;
 823         }
 824 #endif
 825         return 0;
 826 }
 827
 828 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
 829                               struct tc_u_knode *n)
 830 {
 831         struct tc_u_knode __rcu **ins;
 832         struct tc_u_knode *pins;
 833         struct tc_u_hnode *ht;
 834
 835         if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
 836                 ht = rtnl_dereference(tp->root);
 837         else
 838                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
 839
 840         ins = &ht->ht[TC_U32_HASH(n->handle)];
 841
 842         /* The node must always exist for it to be replaced if this is not the
 843          * case then something went very wrong elsewhere.
 844          */
 845         for (pins = rtnl_dereference(*ins); ;
 846              ins = &pins->next, pins = rtnl_dereference(*ins))
 847                 if (pins->handle == n->handle)
 848                         break;
 849
 850         idr_replace_ext(&ht->handle_idr, n, n->handle);
 851         RCU_INIT_POINTER(n->next, pins->next);
 852         rcu_assign_pointer(*ins, n);
 853 }
 854
 855 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
 856                                          struct tc_u_knode *n)
 857 {
 858         struct tc_u_knode *new;
 859         struct tc_u32_sel *s = &n->sel;
 860
 861         new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
 862                       GFP_KERNEL);
 863
 864         if (!new)
 865                 return NULL;
 866
 867         RCU_INIT_POINTER(new->next, n->next);
 868         new->handle = n->handle;
 869         RCU_INIT_POINTER(new->ht_up, n->ht_up);
 870
 871 #ifdef CONFIG_NET_CLS_IND
 872         new->ifindex = n->ifindex;
 873 #endif
 874         new->fshift = n->fshift;
 875         new->res = n->res;
 876         new->flags = n->flags;
 877         RCU_INIT_POINTER(new->ht_down, n->ht_down);
 878
 879         /* bump reference count as long as we hold pointer to structure */
 880         if (new->ht_down)
 881                 new->ht_down->refcnt++;
 882
 883 #ifdef CONFIG_CLS_U32_PERF
 884         /* Statistics may be incremented by readers during update
 885          * so we must keep them in tact. When the node is later destroyed
 886          * a special destroy call must be made to not free the pf memory.
 887          */
 888         new->pf = n->pf;
 889 #endif
 890
 891 #ifdef CONFIG_CLS_U32_MARK
 892         new->val = n->val;
 893         new->mask = n->mask;
 894         /* Similarly success statistics must be moved as pointers */
 895         new->pcpu_success = n->pcpu_success;
 896 #endif
 897         new->tp = tp;
 898         memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 899
 900         if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
 901                 kfree(new);
 902                 return NULL;
 903         }
 904
 905         return new;
 906 }
 907
 908 static int u32_change(struct net *net, struct sk_buff *in_skb,
 909                       struct tcf_proto *tp, unsigned long base, u32 handle,
 910                       struct nlattr **tca, void **arg, bool ovr,
 911                       struct netlink_ext_ack *extack)
 912 {
 913         struct tc_u_common *tp_c = tp->data;
 914         struct tc_u_hnode *ht;
 915         struct tc_u_knode *n;
 916         struct tc_u32_sel *s;
 917         struct nlattr *opt = tca[TCA_OPTIONS];
 918         struct nlattr *tb[TCA_U32_MAX + 1];
 919         u32 htid, flags = 0;
 920         int err;
 921 #ifdef CONFIG_CLS_U32_PERF
 922         size_t size;
 923 #endif
 924
 925         if (!opt) {
 926                 if (handle) {
 927                         NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
 928                         return -EINVAL;
 929                 } else {
 930                         return 0;
 931                 }
 932         }
 933
 934         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack);
 935         if (err < 0)
 936                 return err;
 937
 938         if (tb[TCA_U32_FLAGS]) {
 939                 flags = nla_get_u32(tb[TCA_U32_FLAGS]);
 940                 if (!tc_flags_valid(flags)) {
 941                         NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
 942                         return -EINVAL;
 943                 }
 944         }
 945
 946         n = *arg;
 947         if (n) {
 948                 struct tc_u_knode *new;
 949
 950                 if (TC_U32_KEY(n->handle) == 0) {
 951                         NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
 952                         return -EINVAL;
 953                 }
 954
 955                 if (n->flags != flags) {
 956                         NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
 957                         return -EINVAL;
 958                 }
 959
 960                 new = u32_init_knode(tp, n);
 961                 if (!new)
 962                         return -ENOMEM;
 963
 964                 err = u32_set_parms(net, tp, base,
 965                                     rtnl_dereference(n->ht_up), new, tb,
 966                                     tca[TCA_RATE], ovr, extack);
 967
 968                 if (err) {
 969                         u32_destroy_key(tp, new, false);
 970                         return err;
 971                 }
 972
 973                 err = u32_replace_hw_knode(tp, new, flags, extack);
 974                 if (err) {
 975                         u32_destroy_key(tp, new, false);
 976                         return err;
 977                 }
 978
 979                 if (!tc_in_hw(new->flags))
 980                         new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 981
 982                 u32_replace_knode(tp, tp_c, new);
 983                 tcf_unbind_filter(tp, &n->res);
 984                 tcf_exts_get_net(&n->exts);
 985                 call_rcu(&n->rcu, u32_delete_key_rcu);
 986                 return 0;
 987         }
 988
 989         if (tb[TCA_U32_DIVISOR]) {
 990                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 991
 992                 if (--divisor > 0x100) {
 993                         NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
 994                         return -EINVAL;
 995                 }
 996                 if (TC_U32_KEY(handle)) {
 997                         NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
 998                         return -EINVAL;
 999                 }
1000                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
1001                 if (ht == NULL)
1002                         return -ENOBUFS;
1003                 if (handle == 0) {
1004                         handle = gen_new_htid(tp->data, ht);
1005                         if (handle == 0) {
1006                                 kfree(ht);
1007                                 return -ENOMEM;
1008                         }
1009                 } else {
1010                         err = idr_alloc_ext(&tp_c->handle_idr, ht, NULL,
1011                                             handle, handle + 1, GFP_KERNEL);
1012                         if (err) {
1013                                 kfree(ht);
1014                                 return err;
1015                         }
1016                 }
1017                 ht->tp_c = tp_c;
1018                 ht->refcnt = 1;
1019                 ht->divisor = divisor;
1020                 ht->handle = handle;
1021                 ht->prio = tp->prio;
1022                 idr_init(&ht->handle_idr);
1023                 ht->flags = flags;
1024
1025                 err = u32_replace_hw_hnode(tp, ht, flags, extack);
1026                 if (err) {
1027                         idr_remove_ext(&tp_c->handle_idr, handle);
1028                         kfree(ht);
1029                         return err;
1030                 }
1031
1032                 RCU_INIT_POINTER(ht->next, tp_c->hlist);
1033                 rcu_assign_pointer(tp_c->hlist, ht);
1034                 *arg = ht;
1035
1036                 return 0;
1037         }
1038
1039         if (tb[TCA_U32_HASH]) {
1040                 htid = nla_get_u32(tb[TCA_U32_HASH]);
1041                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
1042                         ht = rtnl_dereference(tp->root);
1043                         htid = ht->handle;
1044                 } else {
1045                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
1046                         if (!ht) {
1047                                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
1048                                 return -EINVAL;
1049                         }
1050                 }
1051         } else {
1052                 ht = rtnl_dereference(tp->root);
1053                 htid = ht->handle;
1054         }
1055
1056         if (ht->divisor < TC_U32_HASH(htid)) {
1057                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
1058                 return -EINVAL;
1059         }
1060
1061         if (handle) {
1062                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1063                         NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1064                         return -EINVAL;
1065                 }
1066                 handle = htid | TC_U32_NODE(handle);
1067                 err = idr_alloc_ext(&ht->handle_idr, NULL, NULL,
1068                                     handle, handle + 1,
1069                                     GFP_KERNEL);
1070                 if (err)
1071                         return err;
1072         } else
1073                 handle = gen_new_kid(ht, htid);
1074
1075         if (tb[TCA_U32_SEL] == NULL) {
1076                 NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1077                 err = -EINVAL;
1078                 goto erridr;
1079         }
1080
1081         s = nla_data(tb[TCA_U32_SEL]);
1082
1083         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
1084         if (n == NULL) {
1085                 err = -ENOBUFS;
1086                 goto erridr;
1087         }
1088
1089 #ifdef CONFIG_CLS_U32_PERF
1090         size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1091         n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1092         if (!n->pf) {
1093                 err = -ENOBUFS;
1094                 goto errfree;
1095         }
1096 #endif
1097
1098         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
1099         RCU_INIT_POINTER(n->ht_up, ht);
1100         n->handle = handle;
1101         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1102         n->flags = flags;
1103         n->tp = tp;
1104
1105         err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1106         if (err < 0)
1107                 goto errout;
1108
1109 #ifdef CONFIG_CLS_U32_MARK
1110         n->pcpu_success = alloc_percpu(u32);
1111         if (!n->pcpu_success) {
1112                 err = -ENOMEM;
1113                 goto errout;
1114         }
1115
1116         if (tb[TCA_U32_MARK]) {
1117                 struct tc_u32_mark *mark;
1118
1119                 mark = nla_data(tb[TCA_U32_MARK]);
1120                 n->val = mark->val;
1121                 n->mask = mark->mask;
1122         }
1123 #endif
1124
1125         err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr,
1126                             extack);
1127         if (err == 0) {
1128                 struct tc_u_knode __rcu **ins;
1129                 struct tc_u_knode *pins;
1130
1131                 err = u32_replace_hw_knode(tp, n, flags, extack);
1132                 if (err)
1133                         goto errhw;
1134
1135                 if (!tc_in_hw(n->flags))
1136                         n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1137
1138                 ins = &ht->ht[TC_U32_HASH(handle)];
1139                 for (pins = rtnl_dereference(*ins); pins;
1140                      ins = &pins->next, pins = rtnl_dereference(*ins))
1141                         if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1142                                 break;
1143
1144                 RCU_INIT_POINTER(n->next, pins);
1145                 rcu_assign_pointer(*ins, n);
1146                 *arg = n;
1147                 return 0;
1148         }
1149
1150 errhw:
1151 #ifdef CONFIG_CLS_U32_MARK
1152         free_percpu(n->pcpu_success);
1153 #endif
1154
1155 errout:
1156         tcf_exts_destroy(&n->exts);
1157 #ifdef CONFIG_CLS_U32_PERF
1158 errfree:
1159         free_percpu(n->pf);
1160 #endif
1161         kfree(n);
1162 erridr:
1163         idr_remove_ext(&ht->handle_idr, handle);
1164         return err;
1165 }
1166
1167 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1168 {
1169         struct tc_u_common *tp_c = tp->data;
1170         struct tc_u_hnode *ht;
1171         struct tc_u_knode *n;
1172         unsigned int h;
1173
1174         if (arg->stop)
1175                 return;
1176
1177         for (ht = rtnl_dereference(tp_c->hlist);
1178              ht;
1179              ht = rtnl_dereference(ht->next)) {
1180                 if (ht->prio != tp->prio)
1181                         continue;
1182                 if (arg->count >= arg->skip) {
1183                         if (arg->fn(tp, ht, arg) < 0) {
1184                                 arg->stop = 1;
1185                                 return;
1186                         }
1187                 }
1188                 arg->count++;
1189                 for (h = 0; h <= ht->divisor; h++) {
1190                         for (n = rtnl_dereference(ht->ht[h]);
1191                              n;
1192                              n = rtnl_dereference(n->next)) {
1193                                 if (arg->count < arg->skip) {
1194                                         arg->count++;
1195                                         continue;
1196                                 }
1197                                 if (arg->fn(tp, n, arg) < 0) {
1198                                         arg->stop = 1;
1199                                         return;
1200                                 }
1201                                 arg->count++;
1202                         }
1203                 }
1204         }
1205 }
1206
1207 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1208 {
1209         struct tc_u_knode *n = fh;
1210
1211         if (n && n->res.classid == classid)
1212                 n->res.class = cl;
1213 }
1214
1215 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1216                     struct sk_buff *skb, struct tcmsg *t)
1217 {
1218         struct tc_u_knode *n = fh;
1219         struct tc_u_hnode *ht_up, *ht_down;
1220         struct nlattr *nest;
1221
1222         if (n == NULL)
1223                 return skb->len;
1224
1225         t->tcm_handle = n->handle;
1226
1227         nest = nla_nest_start(skb, TCA_OPTIONS);
1228         if (nest == NULL)
1229                 goto nla_put_failure;
1230
1231         if (TC_U32_KEY(n->handle) == 0) {
1232                 struct tc_u_hnode *ht = fh;
1233                 u32 divisor = ht->divisor + 1;
1234
1235                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1236                         goto nla_put_failure;
1237         } else {
1238 #ifdef CONFIG_CLS_U32_PERF
1239                 struct tc_u32_pcnt *gpf;
1240                 int cpu;
1241 #endif
1242
1243                 if (nla_put(skb, TCA_U32_SEL,
1244                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1245                             &n->sel))
1246                         goto nla_put_failure;
1247
1248                 ht_up = rtnl_dereference(n->ht_up);
1249                 if (ht_up) {
1250                         u32 htid = n->handle & 0xFFFFF000;
1251                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
1252                                 goto nla_put_failure;
1253                 }
1254                 if (n->res.classid &&
1255                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1256                         goto nla_put_failure;
1257
1258                 ht_down = rtnl_dereference(n->ht_down);
1259                 if (ht_down &&
1260                     nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1261                         goto nla_put_failure;
1262
1263                 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1264                         goto nla_put_failure;
1265
1266 #ifdef CONFIG_CLS_U32_MARK
1267                 if ((n->val || n->mask)) {
1268                         struct tc_u32_mark mark = {.val = n->val,
1269                                                    .mask = n->mask,
1270                                                    .success = 0};
1271                         int cpum;
1272
1273                         for_each_possible_cpu(cpum) {
1274                                 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1275
1276                                 mark.success += cnt;
1277                         }
1278
1279                         if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1280                                 goto nla_put_failure;
1281                 }
1282 #endif
1283
1284                 if (tcf_exts_dump(skb, &n->exts) < 0)
1285                         goto nla_put_failure;
1286
1287 #ifdef CONFIG_NET_CLS_IND
1288                 if (n->ifindex) {
1289                         struct net_device *dev;
1290                         dev = __dev_get_by_index(net, n->ifindex);
1291                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1292                                 goto nla_put_failure;
1293                 }
1294 #endif
1295 #ifdef CONFIG_CLS_U32_PERF
1296                 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1297                               n->sel.nkeys * sizeof(u64),
1298                               GFP_KERNEL);
1299                 if (!gpf)
1300                         goto nla_put_failure;
1301
1302                 for_each_possible_cpu(cpu) {
1303                         int i;
1304                         struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1305
1306                         gpf->rcnt += pf->rcnt;
1307                         gpf->rhit += pf->rhit;
1308                         for (i = 0; i < n->sel.nkeys; i++)
1309                                 gpf->kcnts[i] += pf->kcnts[i];
1310                 }
1311
1312                 if (nla_put_64bit(skb, TCA_U32_PCNT,
1313                                   sizeof(struct tc_u32_pcnt) +
1314                                   n->sel.nkeys * sizeof(u64),
1315                                   gpf, TCA_U32_PAD)) {
1316                         kfree(gpf);
1317                         goto nla_put_failure;
1318                 }
1319                 kfree(gpf);
1320 #endif
1321         }
1322
1323         nla_nest_end(skb, nest);
1324
1325         if (TC_U32_KEY(n->handle))
1326                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1327                         goto nla_put_failure;
1328         return skb->len;
1329
1330 nla_put_failure:
1331         nla_nest_cancel(skb, nest);
1332         return -1;
1333 }
1334
1335 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1336         .kind           =       "u32",
1337         .classify       =       u32_classify,
1338         .init           =       u32_init,
1339         .destroy        =       u32_destroy,
1340         .get            =       u32_get,
1341         .change         =       u32_change,
1342         .delete         =       u32_delete,
1343         .walk           =       u32_walk,
1344         .dump           =       u32_dump,
1345         .bind_class     =       u32_bind_class,
1346         .owner          =       THIS_MODULE,
1347 };
1348
1349 static int __init init_u32(void)
1350 {
1351         int i, ret;
1352
1353         pr_info("u32 classifier\n");
1354 #ifdef CONFIG_CLS_U32_PERF
1355         pr_info("    Performance counters on\n");
1356 #endif
1357 #ifdef CONFIG_NET_CLS_IND
1358         pr_info("    input device check on\n");
1359 #endif
1360 #ifdef CONFIG_NET_CLS_ACT
1361         pr_info("    Actions configured\n");
1362 #endif
1363         tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1364                                           sizeof(struct hlist_head),
1365                                           GFP_KERNEL);
1366         if (!tc_u_common_hash)
1367                 return -ENOMEM;
1368
1369         for (i = 0; i < U32_HASH_SIZE; i++)
1370                 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1371
1372         ret = register_tcf_proto_ops(&cls_u32_ops);
1373         if (ret)
1374                 kvfree(tc_u_common_hash);
1375         return ret;
1376 }
1377
1378 static void __exit exit_u32(void)
1379 {
1380         unregister_tcf_proto_ops(&cls_u32_ops);
1381         kvfree(tc_u_common_hash);
1382 }
1383
1384 module_init(init_u32)
1385 module_exit(exit_u32)
1386 MODULE_LICENSE("GPL");