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         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 402
 403         tcf_exts_destroy(&n->exts);
 404         tcf_exts_put_net(&n->exts);
 405         if (ht && --ht->refcnt == 0)
 406                 kfree(ht);
 407 #ifdef CONFIG_CLS_U32_PERF
 408         if (free_pf)
 409                 free_percpu(n->pf);
 410 #endif
 411 #ifdef CONFIG_CLS_U32_MARK
 412         if (free_pf)
 413                 free_percpu(n->pcpu_success);
 414 #endif
 415         kfree(n);
 416         return 0;
 417 }
 418
 419 /* u32_delete_key_rcu should be called when free'ing a copied
 420  * version of a tc_u_knode obtained from u32_init_knode(). When
 421  * copies are obtained from u32_init_knode() the statistics are
 422  * shared between the old and new copies to allow readers to
 423  * continue to update the statistics during the copy. To support
 424  * this the u32_delete_key_rcu variant does not free the percpu
 425  * statistics.
 426  */
 427 static void u32_delete_key_work(struct work_struct *work)
 428 {
 429         struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
 430
 431         rtnl_lock();
 432         u32_destroy_key(key->tp, key, false);
 433         rtnl_unlock();
 434 }
 435
 436 static void u32_delete_key_rcu(struct rcu_head *rcu)
 437 {
 438         struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
 439
 440         INIT_WORK(&key->work, u32_delete_key_work);
 441         tcf_queue_work(&key->work);
 442 }
 443
 444 /* u32_delete_key_freepf_rcu is the rcu callback variant
 445  * that free's the entire structure including the statistics
 446  * percpu variables. Only use this if the key is not a copy
 447  * returned by u32_init_knode(). See u32_delete_key_rcu()
 448  * for the variant that should be used with keys return from
 449  * u32_init_knode()
 450  */
 451 static void u32_delete_key_freepf_work(struct work_struct *work)
 452 {
 453         struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
 454
 455         rtnl_lock();
 456         u32_destroy_key(key->tp, key, true);
 457         rtnl_unlock();
 458 }
 459
 460 static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
 461 {
 462         struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
 463
 464         INIT_WORK(&key->work, u32_delete_key_freepf_work);
 465         tcf_queue_work(&key->work);
 466 }
 467
 468 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
 469 {
 470         struct tc_u_knode __rcu **kp;
 471         struct tc_u_knode *pkp;
 472         struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
 473
 474         if (ht) {
 475                 kp = &ht->ht[TC_U32_HASH(key->handle)];
 476                 for (pkp = rtnl_dereference(*kp); pkp;
 477                      kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
 478                         if (pkp == key) {
 479                                 RCU_INIT_POINTER(*kp, key->next);
 480
 481                                 tcf_unbind_filter(tp, &key->res);
 482                                 tcf_exts_get_net(&key->exts);
 483                                 call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
 484                                 return 0;
 485                         }
 486                 }
 487         }
 488         WARN_ON(1);
 489         return 0;
 490 }
 491
 492 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 493                                struct netlink_ext_ack *extack)
 494 {
 495         struct tcf_block *block = tp->chain->block;
 496         struct tc_cls_u32_offload cls_u32 = {};
 497
 498         tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
 499         cls_u32.command = TC_CLSU32_DELETE_HNODE;
 500         cls_u32.hnode.divisor = h->divisor;
 501         cls_u32.hnode.handle = h->handle;
 502         cls_u32.hnode.prio = h->prio;
 503
 504         tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
 505 }
 506
 507 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 508                                 u32 flags, struct netlink_ext_ack *extack)
 509 {
 510         struct tcf_block *block = tp->chain->block;
 511         struct tc_cls_u32_offload cls_u32 = {};
 512         bool skip_sw = tc_skip_sw(flags);
 513         bool offloaded = false;
 514         int err;
 515
 516         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 517         cls_u32.command = TC_CLSU32_NEW_HNODE;
 518         cls_u32.hnode.divisor = h->divisor;
 519         cls_u32.hnode.handle = h->handle;
 520         cls_u32.hnode.prio = h->prio;
 521
 522         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 523         if (err < 0) {
 524                 u32_clear_hw_hnode(tp, h, NULL);
 525                 return err;
 526         } else if (err > 0) {
 527                 offloaded = true;
 528         }
 529
 530         if (skip_sw && !offloaded)
 531                 return -EINVAL;
 532
 533         return 0;
 534 }
 535
 536 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 537                                 struct netlink_ext_ack *extack)
 538 {
 539         struct tcf_block *block = tp->chain->block;
 540         struct tc_cls_u32_offload cls_u32 = {};
 541
 542         tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
 543         cls_u32.command = TC_CLSU32_DELETE_KNODE;
 544         cls_u32.knode.handle = n->handle;
 545
 546         tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
 547         tcf_block_offload_dec(block, &n->flags);
 548 }
 549
 550 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 551                                 u32 flags, struct netlink_ext_ack *extack)
 552 {
 553         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 554         struct tcf_block *block = tp->chain->block;
 555         struct tc_cls_u32_offload cls_u32 = {};
 556         bool skip_sw = tc_skip_sw(flags);
 557         int err;
 558
 559         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 560         cls_u32.command = TC_CLSU32_REPLACE_KNODE;
 561         cls_u32.knode.handle = n->handle;
 562         cls_u32.knode.fshift = n->fshift;
 563 #ifdef CONFIG_CLS_U32_MARK
 564         cls_u32.knode.val = n->val;
 565         cls_u32.knode.mask = n->mask;
 566 #else
 567         cls_u32.knode.val = 0;
 568         cls_u32.knode.mask = 0;
 569 #endif
 570         cls_u32.knode.sel = &n->sel;
 571         cls_u32.knode.exts = &n->exts;
 572         if (n->ht_down)
 573                 cls_u32.knode.link_handle = ht->handle;
 574
 575         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 576         if (err < 0) {
 577                 u32_remove_hw_knode(tp, n, NULL);
 578                 return err;
 579         } else if (err > 0) {
 580                 tcf_block_offload_inc(block, &n->flags);
 581         }
 582
 583         if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
 584                 return -EINVAL;
 585
 586         return 0;
 587 }
 588
 589 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 590                             struct netlink_ext_ack *extack)
 591 {
 592         struct tc_u_knode *n;
 593         unsigned int h;
 594
 595         for (h = 0; h <= ht->divisor; h++) {
 596                 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
 597                         RCU_INIT_POINTER(ht->ht[h],
 598                                          rtnl_dereference(n->next));
 599                         tcf_unbind_filter(tp, &n->res);
 600                         u32_remove_hw_knode(tp, n, extack);
 601                         idr_remove_ext(&ht->handle_idr, n->handle);
 602                         if (tcf_exts_get_net(&n->exts))
 603                                 call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
 604                         else
 605                                 u32_destroy_key(n->tp, n, true);
 606                 }
 607         }
 608 }
 609
 610 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 611                              struct netlink_ext_ack *extack)
 612 {
 613         struct tc_u_common *tp_c = tp->data;
 614         struct tc_u_hnode __rcu **hn;
 615         struct tc_u_hnode *phn;
 616
 617         WARN_ON(ht->refcnt);
 618
 619         u32_clear_hnode(tp, ht, extack);
 620
 621         hn = &tp_c->hlist;
 622         for (phn = rtnl_dereference(*hn);
 623              phn;
 624              hn = &phn->next, phn = rtnl_dereference(*hn)) {
 625                 if (phn == ht) {
 626                         u32_clear_hw_hnode(tp, ht, extack);
 627                         idr_destroy(&ht->handle_idr);
 628                         idr_remove_ext(&tp_c->handle_idr, ht->handle);
 629                         RCU_INIT_POINTER(*hn, ht->next);
 630                         kfree_rcu(ht, rcu);
 631                         return 0;
 632                 }
 633         }
 634
 635         return -ENOENT;
 636 }
 637
 638 static bool ht_empty(struct tc_u_hnode *ht)
 639 {
 640         unsigned int h;
 641
 642         for (h = 0; h <= ht->divisor; h++)
 643                 if (rcu_access_pointer(ht->ht[h]))
 644                         return false;
 645
 646         return true;
 647 }
 648
 649 static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 650 {
 651         struct tc_u_common *tp_c = tp->data;
 652         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 653
 654         WARN_ON(root_ht == NULL);
 655
 656         if (root_ht && --root_ht->refcnt == 0)
 657                 u32_destroy_hnode(tp, root_ht, extack);
 658
 659         if (--tp_c->refcnt == 0) {
 660                 struct tc_u_hnode *ht;
 661
 662                 hlist_del(&tp_c->hnode);
 663
 664                 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
 665                         u32_clear_hnode(tp, ht, extack);
 666                         RCU_INIT_POINTER(tp_c->hlist, ht->next);
 667
 668                         /* u32_destroy_key() will later free ht for us, if it's
 669                          * still referenced by some knode
 670                          */
 671                         if (--ht->refcnt == 0)
 672                                 kfree_rcu(ht, rcu);
 673                 }
 674
 675                 idr_destroy(&tp_c->handle_idr);
 676                 kfree(tp_c);
 677         }
 678
 679         tp->data = NULL;
 680 }
 681
 682 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
 683                       struct netlink_ext_ack *extack)
 684 {
 685         struct tc_u_hnode *ht = arg;
 686         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 687         struct tc_u_common *tp_c = tp->data;
 688         int ret = 0;
 689
 690         if (ht == NULL)
 691                 goto out;
 692
 693         if (TC_U32_KEY(ht->handle)) {
 694                 u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
 695                 ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
 696                 goto out;
 697         }
 698
 699         if (root_ht == ht) {
 700                 NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
 701                 return -EINVAL;
 702         }
 703
 704         if (ht->refcnt == 1) {
 705                 ht->refcnt--;
 706                 u32_destroy_hnode(tp, ht, extack);
 707         } else {
 708                 NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
 709                 return -EBUSY;
 710         }
 711
 712 out:
 713         *last = true;
 714         if (root_ht) {
 715                 if (root_ht->refcnt > 1) {
 716                         *last = false;
 717                         goto ret;
 718                 }
 719                 if (root_ht->refcnt == 1) {
 720                         if (!ht_empty(root_ht)) {
 721                                 *last = false;
 722                                 goto ret;
 723                         }
 724                 }
 725         }
 726
 727         if (tp_c->refcnt > 1) {
 728                 *last = false;
 729                 goto ret;
 730         }
 731
 732         if (tp_c->refcnt == 1) {
 733                 struct tc_u_hnode *ht;
 734
 735                 for (ht = rtnl_dereference(tp_c->hlist);
 736                      ht;
 737                      ht = rtnl_dereference(ht->next))
 738                         if (!ht_empty(ht)) {
 739                                 *last = false;
 740                                 break;
 741                         }
 742         }
 743
 744 ret:
 745         return ret;
 746 }
 747
 748 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
 749 {
 750         unsigned long idr_index;
 751         u32 start = htid | 0x800;
 752         u32 max = htid | 0xFFF;
 753         u32 min = htid;
 754
 755         if (idr_alloc_ext(&ht->handle_idr, NULL, &idr_index,
 756                           start, max + 1, GFP_KERNEL)) {
 757                 if (idr_alloc_ext(&ht->handle_idr, NULL, &idr_index,
 758                                   min + 1, max + 1, GFP_KERNEL))
 759                         return max;
 760         }
 761
 762         return (u32)idr_index;
 763 }
 764
 765 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 766         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 767         [TCA_U32_HASH]          = { .type = NLA_U32 },
 768         [TCA_U32_LINK]          = { .type = NLA_U32 },
 769         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 770         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 771         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 772         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 773         [TCA_U32_FLAGS]         = { .type = NLA_U32 },
 774 };
 775
 776 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 777                          unsigned long base, struct tc_u_hnode *ht,
 778                          struct tc_u_knode *n, struct nlattr **tb,
 779                          struct nlattr *est, bool ovr,
 780                          struct netlink_ext_ack *extack)
 781 {
 782         int err;
 783
 784         err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
 785         if (err < 0)
 786                 return err;
 787
 788         if (tb[TCA_U32_LINK]) {
 789                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 790                 struct tc_u_hnode *ht_down = NULL, *ht_old;
 791
 792                 if (TC_U32_KEY(handle)) {
 793                         NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
 794                         return -EINVAL;
 795                 }
 796
 797                 if (handle) {
 798                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 799
 800                         if (!ht_down) {
 801                                 NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
 802                                 return -EINVAL;
 803                         }
 804                         ht_down->refcnt++;
 805                 }
 806
 807                 ht_old = rtnl_dereference(n->ht_down);
 808                 rcu_assign_pointer(n->ht_down, ht_down);
 809
 810                 if (ht_old)
 811                         ht_old->refcnt--;
 812         }
 813         if (tb[TCA_U32_CLASSID]) {
 814                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 815                 tcf_bind_filter(tp, &n->res, base);
 816         }
 817
 818 #ifdef CONFIG_NET_CLS_IND
 819         if (tb[TCA_U32_INDEV]) {
 820                 int ret;
 821                 ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
 822                 if (ret < 0)
 823                         return -EINVAL;
 824                 n->ifindex = ret;
 825         }
 826 #endif
 827         return 0;
 828 }
 829
 830 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
 831                               struct tc_u_knode *n)
 832 {
 833         struct tc_u_knode __rcu **ins;
 834         struct tc_u_knode *pins;
 835         struct tc_u_hnode *ht;
 836
 837         if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
 838                 ht = rtnl_dereference(tp->root);
 839         else
 840                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
 841
 842         ins = &ht->ht[TC_U32_HASH(n->handle)];
 843
 844         /* The node must always exist for it to be replaced if this is not the
 845          * case then something went very wrong elsewhere.
 846          */
 847         for (pins = rtnl_dereference(*ins); ;
 848              ins = &pins->next, pins = rtnl_dereference(*ins))
 849                 if (pins->handle == n->handle)
 850                         break;
 851
 852         idr_replace_ext(&ht->handle_idr, n, n->handle);
 853         RCU_INIT_POINTER(n->next, pins->next);
 854         rcu_assign_pointer(*ins, n);
 855 }
 856
 857 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
 858                                          struct tc_u_knode *n)
 859 {
 860         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 861         struct tc_u32_sel *s = &n->sel;
 862         struct tc_u_knode *new;
 863
 864         new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
 865                       GFP_KERNEL);
 866
 867         if (!new)
 868                 return NULL;
 869
 870         RCU_INIT_POINTER(new->next, n->next);
 871         new->handle = n->handle;
 872         RCU_INIT_POINTER(new->ht_up, n->ht_up);
 873
 874 #ifdef CONFIG_NET_CLS_IND
 875         new->ifindex = n->ifindex;
 876 #endif
 877         new->fshift = n->fshift;
 878         new->res = n->res;
 879         new->flags = n->flags;
 880         RCU_INIT_POINTER(new->ht_down, ht);
 881
 882         /* bump reference count as long as we hold pointer to structure */
 883         if (ht)
 884                 ht->refcnt++;
 885
 886 #ifdef CONFIG_CLS_U32_PERF
 887         /* Statistics may be incremented by readers during update
 888          * so we must keep them in tact. When the node is later destroyed
 889          * a special destroy call must be made to not free the pf memory.
 890          */
 891         new->pf = n->pf;
 892 #endif
 893
 894 #ifdef CONFIG_CLS_U32_MARK
 895         new->val = n->val;
 896         new->mask = n->mask;
 897         /* Similarly success statistics must be moved as pointers */
 898         new->pcpu_success = n->pcpu_success;
 899 #endif
 900         new->tp = tp;
 901         memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 902
 903         if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
 904                 kfree(new);
 905                 return NULL;
 906         }
 907
 908         return new;
 909 }
 910
 911 static int u32_change(struct net *net, struct sk_buff *in_skb,
 912                       struct tcf_proto *tp, unsigned long base, u32 handle,
 913                       struct nlattr **tca, void **arg, bool ovr,
 914                       struct netlink_ext_ack *extack)
 915 {
 916         struct tc_u_common *tp_c = tp->data;
 917         struct tc_u_hnode *ht;
 918         struct tc_u_knode *n;
 919         struct tc_u32_sel *s;
 920         struct nlattr *opt = tca[TCA_OPTIONS];
 921         struct nlattr *tb[TCA_U32_MAX + 1];
 922         u32 htid, flags = 0;
 923         int err;
 924 #ifdef CONFIG_CLS_U32_PERF
 925         size_t size;
 926 #endif
 927
 928         if (!opt) {
 929                 if (handle) {
 930                         NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
 931                         return -EINVAL;
 932                 } else {
 933                         return 0;
 934                 }
 935         }
 936
 937         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack);
 938         if (err < 0)
 939                 return err;
 940
 941         if (tb[TCA_U32_FLAGS]) {
 942                 flags = nla_get_u32(tb[TCA_U32_FLAGS]);
 943                 if (!tc_flags_valid(flags)) {
 944                         NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
 945                         return -EINVAL;
 946                 }
 947         }
 948
 949         n = *arg;
 950         if (n) {
 951                 struct tc_u_knode *new;
 952
 953                 if (TC_U32_KEY(n->handle) == 0) {
 954                         NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
 955                         return -EINVAL;
 956                 }
 957
 958                 if (n->flags != flags) {
 959                         NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
 960                         return -EINVAL;
 961                 }
 962
 963                 new = u32_init_knode(tp, n);
 964                 if (!new)
 965                         return -ENOMEM;
 966
 967                 err = u32_set_parms(net, tp, base,
 968                                     rtnl_dereference(n->ht_up), new, tb,
 969                                     tca[TCA_RATE], ovr, extack);
 970
 971                 if (err) {
 972                         u32_destroy_key(tp, new, false);
 973                         return err;
 974                 }
 975
 976                 err = u32_replace_hw_knode(tp, new, flags, extack);
 977                 if (err) {
 978                         u32_destroy_key(tp, new, false);
 979                         return err;
 980                 }
 981
 982                 if (!tc_in_hw(new->flags))
 983                         new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 984
 985                 u32_replace_knode(tp, tp_c, new);
 986                 tcf_unbind_filter(tp, &n->res);
 987                 tcf_exts_get_net(&n->exts);
 988                 call_rcu(&n->rcu, u32_delete_key_rcu);
 989                 return 0;
 990         }
 991
 992         if (tb[TCA_U32_DIVISOR]) {
 993                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 994
 995                 if (--divisor > 0x100) {
 996                         NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
 997                         return -EINVAL;
 998                 }
 999                 if (TC_U32_KEY(handle)) {
1000                         NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
1001                         return -EINVAL;
1002                 }
1003                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
1004                 if (ht == NULL)
1005                         return -ENOBUFS;
1006                 if (handle == 0) {
1007                         handle = gen_new_htid(tp->data, ht);
1008                         if (handle == 0) {
1009                                 kfree(ht);
1010                                 return -ENOMEM;
1011                         }
1012                 } else {
1013                         err = idr_alloc_ext(&tp_c->handle_idr, ht, NULL,
1014                                             handle, handle + 1, GFP_KERNEL);
1015                         if (err) {
1016                                 kfree(ht);
1017                                 return err;
1018                         }
1019                 }
1020                 ht->tp_c = tp_c;
1021                 ht->refcnt = 1;
1022                 ht->divisor = divisor;
1023                 ht->handle = handle;
1024                 ht->prio = tp->prio;
1025                 idr_init(&ht->handle_idr);
1026                 ht->flags = flags;
1027
1028                 err = u32_replace_hw_hnode(tp, ht, flags, extack);
1029                 if (err) {
1030                         idr_remove_ext(&tp_c->handle_idr, handle);
1031                         kfree(ht);
1032                         return err;
1033                 }
1034
1035                 RCU_INIT_POINTER(ht->next, tp_c->hlist);
1036                 rcu_assign_pointer(tp_c->hlist, ht);
1037                 *arg = ht;
1038
1039                 return 0;
1040         }
1041
1042         if (tb[TCA_U32_HASH]) {
1043                 htid = nla_get_u32(tb[TCA_U32_HASH]);
1044                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
1045                         ht = rtnl_dereference(tp->root);
1046                         htid = ht->handle;
1047                 } else {
1048                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
1049                         if (!ht) {
1050                                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
1051                                 return -EINVAL;
1052                         }
1053                 }
1054         } else {
1055                 ht = rtnl_dereference(tp->root);
1056                 htid = ht->handle;
1057         }
1058
1059         if (ht->divisor < TC_U32_HASH(htid)) {
1060                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
1061                 return -EINVAL;
1062         }
1063
1064         if (handle) {
1065                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1066                         NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1067                         return -EINVAL;
1068                 }
1069                 handle = htid | TC_U32_NODE(handle);
1070                 err = idr_alloc_ext(&ht->handle_idr, NULL, NULL,
1071                                     handle, handle + 1,
1072                                     GFP_KERNEL);
1073                 if (err)
1074                         return err;
1075         } else
1076                 handle = gen_new_kid(ht, htid);
1077
1078         if (tb[TCA_U32_SEL] == NULL) {
1079                 NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1080                 err = -EINVAL;
1081                 goto erridr;
1082         }
1083
1084         s = nla_data(tb[TCA_U32_SEL]);
1085
1086         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
1087         if (n == NULL) {
1088                 err = -ENOBUFS;
1089                 goto erridr;
1090         }
1091
1092 #ifdef CONFIG_CLS_U32_PERF
1093         size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1094         n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1095         if (!n->pf) {
1096                 err = -ENOBUFS;
1097                 goto errfree;
1098         }
1099 #endif
1100
1101         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
1102         RCU_INIT_POINTER(n->ht_up, ht);
1103         n->handle = handle;
1104         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1105         n->flags = flags;
1106         n->tp = tp;
1107
1108         err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1109         if (err < 0)
1110                 goto errout;
1111
1112 #ifdef CONFIG_CLS_U32_MARK
1113         n->pcpu_success = alloc_percpu(u32);
1114         if (!n->pcpu_success) {
1115                 err = -ENOMEM;
1116                 goto errout;
1117         }
1118
1119         if (tb[TCA_U32_MARK]) {
1120                 struct tc_u32_mark *mark;
1121
1122                 mark = nla_data(tb[TCA_U32_MARK]);
1123                 n->val = mark->val;
1124                 n->mask = mark->mask;
1125         }
1126 #endif
1127
1128         err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr,
1129                             extack);
1130         if (err == 0) {
1131                 struct tc_u_knode __rcu **ins;
1132                 struct tc_u_knode *pins;
1133
1134                 err = u32_replace_hw_knode(tp, n, flags, extack);
1135                 if (err)
1136                         goto errhw;
1137
1138                 if (!tc_in_hw(n->flags))
1139                         n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1140
1141                 ins = &ht->ht[TC_U32_HASH(handle)];
1142                 for (pins = rtnl_dereference(*ins); pins;
1143                      ins = &pins->next, pins = rtnl_dereference(*ins))
1144                         if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1145                                 break;
1146
1147                 RCU_INIT_POINTER(n->next, pins);
1148                 rcu_assign_pointer(*ins, n);
1149                 *arg = n;
1150                 return 0;
1151         }
1152
1153 errhw:
1154 #ifdef CONFIG_CLS_U32_MARK
1155         free_percpu(n->pcpu_success);
1156 #endif
1157
1158 errout:
1159         tcf_exts_destroy(&n->exts);
1160 #ifdef CONFIG_CLS_U32_PERF
1161 errfree:
1162         free_percpu(n->pf);
1163 #endif
1164         kfree(n);
1165 erridr:
1166         idr_remove_ext(&ht->handle_idr, handle);
1167         return err;
1168 }
1169
1170 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1171 {
1172         struct tc_u_common *tp_c = tp->data;
1173         struct tc_u_hnode *ht;
1174         struct tc_u_knode *n;
1175         unsigned int h;
1176
1177         if (arg->stop)
1178                 return;
1179
1180         for (ht = rtnl_dereference(tp_c->hlist);
1181              ht;
1182              ht = rtnl_dereference(ht->next)) {
1183                 if (ht->prio != tp->prio)
1184                         continue;
1185                 if (arg->count >= arg->skip) {
1186                         if (arg->fn(tp, ht, arg) < 0) {
1187                                 arg->stop = 1;
1188                                 return;
1189                         }
1190                 }
1191                 arg->count++;
1192                 for (h = 0; h <= ht->divisor; h++) {
1193                         for (n = rtnl_dereference(ht->ht[h]);
1194                              n;
1195                              n = rtnl_dereference(n->next)) {
1196                                 if (arg->count < arg->skip) {
1197                                         arg->count++;
1198                                         continue;
1199                                 }
1200                                 if (arg->fn(tp, n, arg) < 0) {
1201                                         arg->stop = 1;
1202                                         return;
1203                                 }
1204                                 arg->count++;
1205                         }
1206                 }
1207         }
1208 }
1209
1210 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1211 {
1212         struct tc_u_knode *n = fh;
1213
1214         if (n && n->res.classid == classid)
1215                 n->res.class = cl;
1216 }
1217
1218 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1219                     struct sk_buff *skb, struct tcmsg *t)
1220 {
1221         struct tc_u_knode *n = fh;
1222         struct tc_u_hnode *ht_up, *ht_down;
1223         struct nlattr *nest;
1224
1225         if (n == NULL)
1226                 return skb->len;
1227
1228         t->tcm_handle = n->handle;
1229
1230         nest = nla_nest_start(skb, TCA_OPTIONS);
1231         if (nest == NULL)
1232                 goto nla_put_failure;
1233
1234         if (TC_U32_KEY(n->handle) == 0) {
1235                 struct tc_u_hnode *ht = fh;
1236                 u32 divisor = ht->divisor + 1;
1237
1238                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1239                         goto nla_put_failure;
1240         } else {
1241 #ifdef CONFIG_CLS_U32_PERF
1242                 struct tc_u32_pcnt *gpf;
1243                 int cpu;
1244 #endif
1245
1246                 if (nla_put(skb, TCA_U32_SEL,
1247                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1248                             &n->sel))
1249                         goto nla_put_failure;
1250
1251                 ht_up = rtnl_dereference(n->ht_up);
1252                 if (ht_up) {
1253                         u32 htid = n->handle & 0xFFFFF000;
1254                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
1255                                 goto nla_put_failure;
1256                 }
1257                 if (n->res.classid &&
1258                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1259                         goto nla_put_failure;
1260
1261                 ht_down = rtnl_dereference(n->ht_down);
1262                 if (ht_down &&
1263                     nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1264                         goto nla_put_failure;
1265
1266                 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1267                         goto nla_put_failure;
1268
1269 #ifdef CONFIG_CLS_U32_MARK
1270                 if ((n->val || n->mask)) {
1271                         struct tc_u32_mark mark = {.val = n->val,
1272                                                    .mask = n->mask,
1273                                                    .success = 0};
1274                         int cpum;
1275
1276                         for_each_possible_cpu(cpum) {
1277                                 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1278
1279                                 mark.success += cnt;
1280                         }
1281
1282                         if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1283                                 goto nla_put_failure;
1284                 }
1285 #endif
1286
1287                 if (tcf_exts_dump(skb, &n->exts) < 0)
1288                         goto nla_put_failure;
1289
1290 #ifdef CONFIG_NET_CLS_IND
1291                 if (n->ifindex) {
1292                         struct net_device *dev;
1293                         dev = __dev_get_by_index(net, n->ifindex);
1294                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1295                                 goto nla_put_failure;
1296                 }
1297 #endif
1298 #ifdef CONFIG_CLS_U32_PERF
1299                 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1300                               n->sel.nkeys * sizeof(u64),
1301                               GFP_KERNEL);
1302                 if (!gpf)
1303                         goto nla_put_failure;
1304
1305                 for_each_possible_cpu(cpu) {
1306                         int i;
1307                         struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1308
1309                         gpf->rcnt += pf->rcnt;
1310                         gpf->rhit += pf->rhit;
1311                         for (i = 0; i < n->sel.nkeys; i++)
1312                                 gpf->kcnts[i] += pf->kcnts[i];
1313                 }
1314
1315                 if (nla_put_64bit(skb, TCA_U32_PCNT,
1316                                   sizeof(struct tc_u32_pcnt) +
1317                                   n->sel.nkeys * sizeof(u64),
1318                                   gpf, TCA_U32_PAD)) {
1319                         kfree(gpf);
1320                         goto nla_put_failure;
1321                 }
1322                 kfree(gpf);
1323 #endif
1324         }
1325
1326         nla_nest_end(skb, nest);
1327
1328         if (TC_U32_KEY(n->handle))
1329                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1330                         goto nla_put_failure;
1331         return skb->len;
1332
1333 nla_put_failure:
1334         nla_nest_cancel(skb, nest);
1335         return -1;
1336 }
1337
1338 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1339         .kind           =       "u32",
1340         .classify       =       u32_classify,
1341         .init           =       u32_init,
1342         .destroy        =       u32_destroy,
1343         .get            =       u32_get,
1344         .change         =       u32_change,
1345         .delete         =       u32_delete,
1346         .walk           =       u32_walk,
1347         .dump           =       u32_dump,
1348         .bind_class     =       u32_bind_class,
1349         .owner          =       THIS_MODULE,
1350 };
1351
1352 static int __init init_u32(void)
1353 {
1354         int i, ret;
1355
1356         pr_info("u32 classifier\n");
1357 #ifdef CONFIG_CLS_U32_PERF
1358         pr_info("    Performance counters on\n");
1359 #endif
1360 #ifdef CONFIG_NET_CLS_IND
1361         pr_info("    input device check on\n");
1362 #endif
1363 #ifdef CONFIG_NET_CLS_ACT
1364         pr_info("    Actions configured\n");
1365 #endif
1366         tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1367                                           sizeof(struct hlist_head),
1368                                           GFP_KERNEL);
1369         if (!tc_u_common_hash)
1370                 return -ENOMEM;
1371
1372         for (i = 0; i < U32_HASH_SIZE; i++)
1373                 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1374
1375         ret = register_tcf_proto_ops(&cls_u32_ops);
1376         if (ret)
1377                 kvfree(tc_u_common_hash);
1378         return ret;
1379 }
1380
1381 static void __exit exit_u32(void)
1382 {
1383         unregister_tcf_proto_ops(&cls_u32_ops);
1384         kvfree(tc_u_common_hash);
1385 }
1386
1387 module_init(init_u32)
1388 module_exit(exit_u32)
1389 MODULE_LICENSE("GPL");