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 tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 552         struct tcf_block *block = tp->chain->block;
 553         struct tc_cls_u32_offload cls_u32 = {};
 554         bool skip_sw = tc_skip_sw(flags);
 555         int err;
 556
 557         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 558         cls_u32.command = TC_CLSU32_REPLACE_KNODE;
 559         cls_u32.knode.handle = n->handle;
 560         cls_u32.knode.fshift = n->fshift;
 561 #ifdef CONFIG_CLS_U32_MARK
 562         cls_u32.knode.val = n->val;
 563         cls_u32.knode.mask = n->mask;
 564 #else
 565         cls_u32.knode.val = 0;
 566         cls_u32.knode.mask = 0;
 567 #endif
 568         cls_u32.knode.sel = &n->sel;
 569         cls_u32.knode.exts = &n->exts;
 570         if (n->ht_down)
 571                 cls_u32.knode.link_handle = ht->handle;
 572
 573         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 574         if (err < 0) {
 575                 u32_remove_hw_knode(tp, n, NULL);
 576                 return err;
 577         } else if (err > 0) {
 578                 tcf_block_offload_inc(block, &n->flags);
 579         }
 580
 581         if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
 582                 return -EINVAL;
 583
 584         return 0;
 585 }
 586
 587 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 588                             struct netlink_ext_ack *extack)
 589 {
 590         struct tc_u_knode *n;
 591         unsigned int h;
 592
 593         for (h = 0; h <= ht->divisor; h++) {
 594                 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
 595                         RCU_INIT_POINTER(ht->ht[h],
 596                                          rtnl_dereference(n->next));
 597                         tcf_unbind_filter(tp, &n->res);
 598                         u32_remove_hw_knode(tp, n, extack);
 599                         idr_remove_ext(&ht->handle_idr, n->handle);
 600                         if (tcf_exts_get_net(&n->exts))
 601                                 call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
 602                         else
 603                                 u32_destroy_key(n->tp, n, true);
 604                 }
 605         }
 606 }
 607
 608 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 609                              struct netlink_ext_ack *extack)
 610 {
 611         struct tc_u_common *tp_c = tp->data;
 612         struct tc_u_hnode __rcu **hn;
 613         struct tc_u_hnode *phn;
 614
 615         WARN_ON(ht->refcnt);
 616
 617         u32_clear_hnode(tp, ht, extack);
 618
 619         hn = &tp_c->hlist;
 620         for (phn = rtnl_dereference(*hn);
 621              phn;
 622              hn = &phn->next, phn = rtnl_dereference(*hn)) {
 623                 if (phn == ht) {
 624                         u32_clear_hw_hnode(tp, ht, extack);
 625                         idr_destroy(&ht->handle_idr);
 626                         idr_remove_ext(&tp_c->handle_idr, ht->handle);
 627                         RCU_INIT_POINTER(*hn, ht->next);
 628                         kfree_rcu(ht, rcu);
 629                         return 0;
 630                 }
 631         }
 632
 633         return -ENOENT;
 634 }
 635
 636 static bool ht_empty(struct tc_u_hnode *ht)
 637 {
 638         unsigned int h;
 639
 640         for (h = 0; h <= ht->divisor; h++)
 641                 if (rcu_access_pointer(ht->ht[h]))
 642                         return false;
 643
 644         return true;
 645 }
 646
 647 static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 648 {
 649         struct tc_u_common *tp_c = tp->data;
 650         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 651
 652         WARN_ON(root_ht == NULL);
 653
 654         if (root_ht && --root_ht->refcnt == 0)
 655                 u32_destroy_hnode(tp, root_ht, extack);
 656
 657         if (--tp_c->refcnt == 0) {
 658                 struct tc_u_hnode *ht;
 659
 660                 hlist_del(&tp_c->hnode);
 661
 662                 for (ht = rtnl_dereference(tp_c->hlist);
 663                      ht;
 664                      ht = rtnl_dereference(ht->next)) {
 665                         ht->refcnt--;
 666                         u32_clear_hnode(tp, ht, extack);
 667                 }
 668
 669                 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
 670                         RCU_INIT_POINTER(tp_c->hlist, ht->next);
 671                         kfree_rcu(ht, rcu);
 672                 }
 673
 674                 idr_destroy(&tp_c->handle_idr);
 675                 kfree(tp_c);
 676         }
 677
 678         tp->data = NULL;
 679 }
 680
 681 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
 682                       struct netlink_ext_ack *extack)
 683 {
 684         struct tc_u_hnode *ht = arg;
 685         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 686         struct tc_u_common *tp_c = tp->data;
 687         int ret = 0;
 688
 689         if (ht == NULL)
 690                 goto out;
 691
 692         if (TC_U32_KEY(ht->handle)) {
 693                 u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
 694                 ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
 695                 goto out;
 696         }
 697
 698         if (root_ht == ht) {
 699                 NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
 700                 return -EINVAL;
 701         }
 702
 703         if (ht->refcnt == 1) {
 704                 ht->refcnt--;
 705                 u32_destroy_hnode(tp, ht, extack);
 706         } else {
 707                 NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
 708                 return -EBUSY;
 709         }
 710
 711 out:
 712         *last = true;
 713         if (root_ht) {
 714                 if (root_ht->refcnt > 1) {
 715                         *last = false;
 716                         goto ret;
 717                 }
 718                 if (root_ht->refcnt == 1) {
 719                         if (!ht_empty(root_ht)) {
 720                                 *last = false;
 721                                 goto ret;
 722                         }
 723                 }
 724         }
 725
 726         if (tp_c->refcnt > 1) {
 727                 *last = false;
 728                 goto ret;
 729         }
 730
 731         if (tp_c->refcnt == 1) {
 732                 struct tc_u_hnode *ht;
 733
 734                 for (ht = rtnl_dereference(tp_c->hlist);
 735                      ht;
 736                      ht = rtnl_dereference(ht->next))
 737                         if (!ht_empty(ht)) {
 738                                 *last = false;
 739                                 break;
 740                         }
 741         }
 742
 743 ret:
 744         return ret;
 745 }
 746
 747 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
 748 {
 749         unsigned long idr_index;
 750         u32 start = htid | 0x800;
 751         u32 max = htid | 0xFFF;
 752         u32 min = htid;
 753
 754         if (idr_alloc_ext(&ht->handle_idr, NULL, &idr_index,
 755                           start, max + 1, GFP_KERNEL)) {
 756                 if (idr_alloc_ext(&ht->handle_idr, NULL, &idr_index,
 757                                   min + 1, max + 1, GFP_KERNEL))
 758                         return max;
 759         }
 760
 761         return (u32)idr_index;
 762 }
 763
 764 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 765         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 766         [TCA_U32_HASH]          = { .type = NLA_U32 },
 767         [TCA_U32_LINK]          = { .type = NLA_U32 },
 768         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 769         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 770         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 771         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 772         [TCA_U32_FLAGS]         = { .type = NLA_U32 },
 773 };
 774
 775 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 776                          unsigned long base, struct tc_u_hnode *ht,
 777                          struct tc_u_knode *n, struct nlattr **tb,
 778                          struct nlattr *est, bool ovr,
 779                          struct netlink_ext_ack *extack)
 780 {
 781         int err;
 782
 783         err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
 784         if (err < 0)
 785                 return err;
 786
 787         if (tb[TCA_U32_LINK]) {
 788                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 789                 struct tc_u_hnode *ht_down = NULL, *ht_old;
 790
 791                 if (TC_U32_KEY(handle)) {
 792                         NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
 793                         return -EINVAL;
 794                 }
 795
 796                 if (handle) {
 797                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 798
 799                         if (!ht_down) {
 800                                 NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
 801                                 return -EINVAL;
 802                         }
 803                         ht_down->refcnt++;
 804                 }
 805
 806                 ht_old = rtnl_dereference(n->ht_down);
 807                 rcu_assign_pointer(n->ht_down, ht_down);
 808
 809                 if (ht_old)
 810                         ht_old->refcnt--;
 811         }
 812         if (tb[TCA_U32_CLASSID]) {
 813                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 814                 tcf_bind_filter(tp, &n->res, base);
 815         }
 816
 817 #ifdef CONFIG_NET_CLS_IND
 818         if (tb[TCA_U32_INDEV]) {
 819                 int ret;
 820                 ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
 821                 if (ret < 0)
 822                         return -EINVAL;
 823                 n->ifindex = ret;
 824         }
 825 #endif
 826         return 0;
 827 }
 828
 829 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
 830                               struct tc_u_knode *n)
 831 {
 832         struct tc_u_knode __rcu **ins;
 833         struct tc_u_knode *pins;
 834         struct tc_u_hnode *ht;
 835
 836         if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
 837                 ht = rtnl_dereference(tp->root);
 838         else
 839                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
 840
 841         ins = &ht->ht[TC_U32_HASH(n->handle)];
 842
 843         /* The node must always exist for it to be replaced if this is not the
 844          * case then something went very wrong elsewhere.
 845          */
 846         for (pins = rtnl_dereference(*ins); ;
 847              ins = &pins->next, pins = rtnl_dereference(*ins))
 848                 if (pins->handle == n->handle)
 849                         break;
 850
 851         idr_replace_ext(&ht->handle_idr, n, n->handle);
 852         RCU_INIT_POINTER(n->next, pins->next);
 853         rcu_assign_pointer(*ins, n);
 854 }
 855
 856 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
 857                                          struct tc_u_knode *n)
 858 {
 859         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 860         struct tc_u32_sel *s = &n->sel;
 861         struct tc_u_knode *new;
 862
 863         new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
 864                       GFP_KERNEL);
 865
 866         if (!new)
 867                 return NULL;
 868
 869         RCU_INIT_POINTER(new->next, n->next);
 870         new->handle = n->handle;
 871         RCU_INIT_POINTER(new->ht_up, n->ht_up);
 872
 873 #ifdef CONFIG_NET_CLS_IND
 874         new->ifindex = n->ifindex;
 875 #endif
 876         new->fshift = n->fshift;
 877         new->res = n->res;
 878         new->flags = n->flags;
 879         RCU_INIT_POINTER(new->ht_down, ht);
 880
 881         /* bump reference count as long as we hold pointer to structure */
 882         if (ht)
 883                 ht->refcnt++;
 884
 885 #ifdef CONFIG_CLS_U32_PERF
 886         /* Statistics may be incremented by readers during update
 887          * so we must keep them in tact. When the node is later destroyed
 888          * a special destroy call must be made to not free the pf memory.
 889          */
 890         new->pf = n->pf;
 891 #endif
 892
 893 #ifdef CONFIG_CLS_U32_MARK
 894         new->val = n->val;
 895         new->mask = n->mask;
 896         /* Similarly success statistics must be moved as pointers */
 897         new->pcpu_success = n->pcpu_success;
 898 #endif
 899         new->tp = tp;
 900         memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 901
 902         if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
 903                 kfree(new);
 904                 return NULL;
 905         }
 906
 907         return new;
 908 }
 909
 910 static int u32_change(struct net *net, struct sk_buff *in_skb,
 911                       struct tcf_proto *tp, unsigned long base, u32 handle,
 912                       struct nlattr **tca, void **arg, bool ovr,
 913                       struct netlink_ext_ack *extack)
 914 {
 915         struct tc_u_common *tp_c = tp->data;
 916         struct tc_u_hnode *ht;
 917         struct tc_u_knode *n;
 918         struct tc_u32_sel *s;
 919         struct nlattr *opt = tca[TCA_OPTIONS];
 920         struct nlattr *tb[TCA_U32_MAX + 1];
 921         u32 htid, flags = 0;
 922         int err;
 923 #ifdef CONFIG_CLS_U32_PERF
 924         size_t size;
 925 #endif
 926
 927         if (!opt) {
 928                 if (handle) {
 929                         NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
 930                         return -EINVAL;
 931                 } else {
 932                         return 0;
 933                 }
 934         }
 935
 936         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack);
 937         if (err < 0)
 938                 return err;
 939
 940         if (tb[TCA_U32_FLAGS]) {
 941                 flags = nla_get_u32(tb[TCA_U32_FLAGS]);
 942                 if (!tc_flags_valid(flags)) {
 943                         NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
 944                         return -EINVAL;
 945                 }
 946         }
 947
 948         n = *arg;
 949         if (n) {
 950                 struct tc_u_knode *new;
 951
 952                 if (TC_U32_KEY(n->handle) == 0) {
 953                         NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
 954                         return -EINVAL;
 955                 }
 956
 957                 if (n->flags != flags) {
 958                         NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
 959                         return -EINVAL;
 960                 }
 961
 962                 new = u32_init_knode(tp, n);
 963                 if (!new)
 964                         return -ENOMEM;
 965
 966                 err = u32_set_parms(net, tp, base,
 967                                     rtnl_dereference(n->ht_up), new, tb,
 968                                     tca[TCA_RATE], ovr, extack);
 969
 970                 if (err) {
 971                         u32_destroy_key(tp, new, false);
 972                         return err;
 973                 }
 974
 975                 err = u32_replace_hw_knode(tp, new, flags, extack);
 976                 if (err) {
 977                         u32_destroy_key(tp, new, false);
 978                         return err;
 979                 }
 980
 981                 if (!tc_in_hw(new->flags))
 982                         new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 983
 984                 u32_replace_knode(tp, tp_c, new);
 985                 tcf_unbind_filter(tp, &n->res);
 986                 tcf_exts_get_net(&n->exts);
 987                 call_rcu(&n->rcu, u32_delete_key_rcu);
 988                 return 0;
 989         }
 990
 991         if (tb[TCA_U32_DIVISOR]) {
 992                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 993
 994                 if (--divisor > 0x100) {
 995                         NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
 996                         return -EINVAL;
 997                 }
 998                 if (TC_U32_KEY(handle)) {
 999                         NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
1000                         return -EINVAL;
1001                 }
1002                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
1003                 if (ht == NULL)
1004                         return -ENOBUFS;
1005                 if (handle == 0) {
1006                         handle = gen_new_htid(tp->data, ht);
1007                         if (handle == 0) {
1008                                 kfree(ht);
1009                                 return -ENOMEM;
1010                         }
1011                 } else {
1012                         err = idr_alloc_ext(&tp_c->handle_idr, ht, NULL,
1013                                             handle, handle + 1, GFP_KERNEL);
1014                         if (err) {
1015                                 kfree(ht);
1016                                 return err;
1017                         }
1018                 }
1019                 ht->tp_c = tp_c;
1020                 ht->refcnt = 1;
1021                 ht->divisor = divisor;
1022                 ht->handle = handle;
1023                 ht->prio = tp->prio;
1024                 idr_init(&ht->handle_idr);
1025                 ht->flags = flags;
1026
1027                 err = u32_replace_hw_hnode(tp, ht, flags, extack);
1028                 if (err) {
1029                         idr_remove_ext(&tp_c->handle_idr, handle);
1030                         kfree(ht);
1031                         return err;
1032                 }
1033
1034                 RCU_INIT_POINTER(ht->next, tp_c->hlist);
1035                 rcu_assign_pointer(tp_c->hlist, ht);
1036                 *arg = ht;
1037
1038                 return 0;
1039         }
1040
1041         if (tb[TCA_U32_HASH]) {
1042                 htid = nla_get_u32(tb[TCA_U32_HASH]);
1043                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
1044                         ht = rtnl_dereference(tp->root);
1045                         htid = ht->handle;
1046                 } else {
1047                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
1048                         if (!ht) {
1049                                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
1050                                 return -EINVAL;
1051                         }
1052                 }
1053         } else {
1054                 ht = rtnl_dereference(tp->root);
1055                 htid = ht->handle;
1056         }
1057
1058         if (ht->divisor < TC_U32_HASH(htid)) {
1059                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
1060                 return -EINVAL;
1061         }
1062
1063         if (handle) {
1064                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1065                         NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1066                         return -EINVAL;
1067                 }
1068                 handle = htid | TC_U32_NODE(handle);
1069                 err = idr_alloc_ext(&ht->handle_idr, NULL, NULL,
1070                                     handle, handle + 1,
1071                                     GFP_KERNEL);
1072                 if (err)
1073                         return err;
1074         } else
1075                 handle = gen_new_kid(ht, htid);
1076
1077         if (tb[TCA_U32_SEL] == NULL) {
1078                 NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1079                 err = -EINVAL;
1080                 goto erridr;
1081         }
1082
1083         s = nla_data(tb[TCA_U32_SEL]);
1084
1085         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
1086         if (n == NULL) {
1087                 err = -ENOBUFS;
1088                 goto erridr;
1089         }
1090
1091 #ifdef CONFIG_CLS_U32_PERF
1092         size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1093         n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1094         if (!n->pf) {
1095                 err = -ENOBUFS;
1096                 goto errfree;
1097         }
1098 #endif
1099
1100         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
1101         RCU_INIT_POINTER(n->ht_up, ht);
1102         n->handle = handle;
1103         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1104         n->flags = flags;
1105         n->tp = tp;
1106
1107         err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1108         if (err < 0)
1109                 goto errout;
1110
1111 #ifdef CONFIG_CLS_U32_MARK
1112         n->pcpu_success = alloc_percpu(u32);
1113         if (!n->pcpu_success) {
1114                 err = -ENOMEM;
1115                 goto errout;
1116         }
1117
1118         if (tb[TCA_U32_MARK]) {
1119                 struct tc_u32_mark *mark;
1120
1121                 mark = nla_data(tb[TCA_U32_MARK]);
1122                 n->val = mark->val;
1123                 n->mask = mark->mask;
1124         }
1125 #endif
1126
1127         err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr,
1128                             extack);
1129         if (err == 0) {
1130                 struct tc_u_knode __rcu **ins;
1131                 struct tc_u_knode *pins;
1132
1133                 err = u32_replace_hw_knode(tp, n, flags, extack);
1134                 if (err)
1135                         goto errhw;
1136
1137                 if (!tc_in_hw(n->flags))
1138                         n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1139
1140                 ins = &ht->ht[TC_U32_HASH(handle)];
1141                 for (pins = rtnl_dereference(*ins); pins;
1142                      ins = &pins->next, pins = rtnl_dereference(*ins))
1143                         if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1144                                 break;
1145
1146                 RCU_INIT_POINTER(n->next, pins);
1147                 rcu_assign_pointer(*ins, n);
1148                 *arg = n;
1149                 return 0;
1150         }
1151
1152 errhw:
1153 #ifdef CONFIG_CLS_U32_MARK
1154         free_percpu(n->pcpu_success);
1155 #endif
1156
1157 errout:
1158         tcf_exts_destroy(&n->exts);
1159 #ifdef CONFIG_CLS_U32_PERF
1160 errfree:
1161         free_percpu(n->pf);
1162 #endif
1163         kfree(n);
1164 erridr:
1165         idr_remove_ext(&ht->handle_idr, handle);
1166         return err;
1167 }
1168
1169 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1170 {
1171         struct tc_u_common *tp_c = tp->data;
1172         struct tc_u_hnode *ht;
1173         struct tc_u_knode *n;
1174         unsigned int h;
1175
1176         if (arg->stop)
1177                 return;
1178
1179         for (ht = rtnl_dereference(tp_c->hlist);
1180              ht;
1181              ht = rtnl_dereference(ht->next)) {
1182                 if (ht->prio != tp->prio)
1183                         continue;
1184                 if (arg->count >= arg->skip) {
1185                         if (arg->fn(tp, ht, arg) < 0) {
1186                                 arg->stop = 1;
1187                                 return;
1188                         }
1189                 }
1190                 arg->count++;
1191                 for (h = 0; h <= ht->divisor; h++) {
1192                         for (n = rtnl_dereference(ht->ht[h]);
1193                              n;
1194                              n = rtnl_dereference(n->next)) {
1195                                 if (arg->count < arg->skip) {
1196                                         arg->count++;
1197                                         continue;
1198                                 }
1199                                 if (arg->fn(tp, n, arg) < 0) {
1200                                         arg->stop = 1;
1201                                         return;
1202                                 }
1203                                 arg->count++;
1204                         }
1205                 }
1206         }
1207 }
1208
1209 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1210 {
1211         struct tc_u_knode *n = fh;
1212
1213         if (n && n->res.classid == classid)
1214                 n->res.class = cl;
1215 }
1216
1217 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1218                     struct sk_buff *skb, struct tcmsg *t)
1219 {
1220         struct tc_u_knode *n = fh;
1221         struct tc_u_hnode *ht_up, *ht_down;
1222         struct nlattr *nest;
1223
1224         if (n == NULL)
1225                 return skb->len;
1226
1227         t->tcm_handle = n->handle;
1228
1229         nest = nla_nest_start(skb, TCA_OPTIONS);
1230         if (nest == NULL)
1231                 goto nla_put_failure;
1232
1233         if (TC_U32_KEY(n->handle) == 0) {
1234                 struct tc_u_hnode *ht = fh;
1235                 u32 divisor = ht->divisor + 1;
1236
1237                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1238                         goto nla_put_failure;
1239         } else {
1240 #ifdef CONFIG_CLS_U32_PERF
1241                 struct tc_u32_pcnt *gpf;
1242                 int cpu;
1243 #endif
1244
1245                 if (nla_put(skb, TCA_U32_SEL,
1246                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1247                             &n->sel))
1248                         goto nla_put_failure;
1249
1250                 ht_up = rtnl_dereference(n->ht_up);
1251                 if (ht_up) {
1252                         u32 htid = n->handle & 0xFFFFF000;
1253                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
1254                                 goto nla_put_failure;
1255                 }
1256                 if (n->res.classid &&
1257                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1258                         goto nla_put_failure;
1259
1260                 ht_down = rtnl_dereference(n->ht_down);
1261                 if (ht_down &&
1262                     nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1263                         goto nla_put_failure;
1264
1265                 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1266                         goto nla_put_failure;
1267
1268 #ifdef CONFIG_CLS_U32_MARK
1269                 if ((n->val || n->mask)) {
1270                         struct tc_u32_mark mark = {.val = n->val,
1271                                                    .mask = n->mask,
1272                                                    .success = 0};
1273                         int cpum;
1274
1275                         for_each_possible_cpu(cpum) {
1276                                 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1277
1278                                 mark.success += cnt;
1279                         }
1280
1281                         if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1282                                 goto nla_put_failure;
1283                 }
1284 #endif
1285
1286                 if (tcf_exts_dump(skb, &n->exts) < 0)
1287                         goto nla_put_failure;
1288
1289 #ifdef CONFIG_NET_CLS_IND
1290                 if (n->ifindex) {
1291                         struct net_device *dev;
1292                         dev = __dev_get_by_index(net, n->ifindex);
1293                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1294                                 goto nla_put_failure;
1295                 }
1296 #endif
1297 #ifdef CONFIG_CLS_U32_PERF
1298                 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1299                               n->sel.nkeys * sizeof(u64),
1300                               GFP_KERNEL);
1301                 if (!gpf)
1302                         goto nla_put_failure;
1303
1304                 for_each_possible_cpu(cpu) {
1305                         int i;
1306                         struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1307
1308                         gpf->rcnt += pf->rcnt;
1309                         gpf->rhit += pf->rhit;
1310                         for (i = 0; i < n->sel.nkeys; i++)
1311                                 gpf->kcnts[i] += pf->kcnts[i];
1312                 }
1313
1314                 if (nla_put_64bit(skb, TCA_U32_PCNT,
1315                                   sizeof(struct tc_u32_pcnt) +
1316                                   n->sel.nkeys * sizeof(u64),
1317                                   gpf, TCA_U32_PAD)) {
1318                         kfree(gpf);
1319                         goto nla_put_failure;
1320                 }
1321                 kfree(gpf);
1322 #endif
1323         }
1324
1325         nla_nest_end(skb, nest);
1326
1327         if (TC_U32_KEY(n->handle))
1328                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1329                         goto nla_put_failure;
1330         return skb->len;
1331
1332 nla_put_failure:
1333         nla_nest_cancel(skb, nest);
1334         return -1;
1335 }
1336
1337 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1338         .kind           =       "u32",
1339         .classify       =       u32_classify,
1340         .init           =       u32_init,
1341         .destroy        =       u32_destroy,
1342         .get            =       u32_get,
1343         .change         =       u32_change,
1344         .delete         =       u32_delete,
1345         .walk           =       u32_walk,
1346         .dump           =       u32_dump,
1347         .bind_class     =       u32_bind_class,
1348         .owner          =       THIS_MODULE,
1349 };
1350
1351 static int __init init_u32(void)
1352 {
1353         int i, ret;
1354
1355         pr_info("u32 classifier\n");
1356 #ifdef CONFIG_CLS_U32_PERF
1357         pr_info("    Performance counters on\n");
1358 #endif
1359 #ifdef CONFIG_NET_CLS_IND
1360         pr_info("    input device check on\n");
1361 #endif
1362 #ifdef CONFIG_NET_CLS_ACT
1363         pr_info("    Actions configured\n");
1364 #endif
1365         tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1366                                           sizeof(struct hlist_head),
1367                                           GFP_KERNEL);
1368         if (!tc_u_common_hash)
1369                 return -ENOMEM;
1370
1371         for (i = 0; i < U32_HASH_SIZE; i++)
1372                 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1373
1374         ret = register_tcf_proto_ops(&cls_u32_ops);
1375         if (ret)
1376                 kvfree(tc_u_common_hash);
1377         return ret;
1378 }
1379
1380 static void __exit exit_u32(void)
1381 {
1382         unregister_tcf_proto_ops(&cls_u32_ops);
1383         kvfree(tc_u_common_hash);
1384 }
1385
1386 module_init(init_u32)
1387 module_exit(exit_u32)
1388 MODULE_LICENSE("GPL");