net/sched/cls_u32.c

   1 /*
   2  * net/sched/cls_u32.c  Ugly (or Universal) 32bit key Packet Classifier.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  *      The filters are packed to hash tables of key nodes
  12  *      with a set of 32bit key/mask pairs at every node.
  13  *      Nodes reference next level hash tables etc.
  14  *
  15  *      This scheme is the best universal classifier I managed to
  16  *      invent; it is not super-fast, but it is not slow (provided you
  17  *      program it correctly), and general enough.  And its relative
  18  *      speed grows as the number of rules becomes larger.
  19  *
  20  *      It seems that it represents the best middle point between
  21  *      speed and manageability both by human and by machine.
  22  *
  23  *      It is especially useful for link sharing combined with QoS;
  24  *      pure RSVP doesn't need such a general approach and can use
  25  *      much simpler (and faster) schemes, sort of cls_rsvp.c.
  26  *
  27  *      JHS: We should remove the CONFIG_NET_CLS_IND from here
  28  *      eventually when the meta match extension is made available
  29  *
  30  *      nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
  31  */
  32
  33 #include <linux/module.h>
  34 #include <linux/slab.h>
  35 #include <linux/types.h>
  36 #include <linux/kernel.h>
  37 #include <linux/string.h>
  38 #include <linux/errno.h>
  39 #include <linux/percpu.h>
  40 #include <linux/rtnetlink.h>
  41 #include <linux/skbuff.h>
  42 #include <linux/bitmap.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/hash.h>
  45 #include <net/netlink.h>
  46 #include <net/act_api.h>
  47 #include <net/pkt_cls.h>
  48 #include <linux/idr.h>
  49
  50 struct tc_u_knode {
  51         struct tc_u_knode __rcu *next;
  52         u32                     handle;
  53         struct tc_u_hnode __rcu *ht_up;
  54         struct tcf_exts         exts;
  55 #ifdef CONFIG_NET_CLS_IND
  56         int                     ifindex;
  57 #endif
  58         u8                      fshift;
  59         struct tcf_result       res;
  60         struct tc_u_hnode __rcu *ht_down;
  61 #ifdef CONFIG_CLS_U32_PERF
  62         struct tc_u32_pcnt __percpu *pf;
  63 #endif
  64         u32                     flags;
  65 #ifdef CONFIG_CLS_U32_MARK
  66         u32                     val;
  67         u32                     mask;
  68         u32 __percpu            *pcpu_success;
  69 #endif
  70         struct tcf_proto        *tp;
  71         union {
  72                 struct work_struct      work;
  73                 struct rcu_head         rcu;
  74         };
  75         /* The 'sel' field MUST be the last field in structure to allow for
  76          * tc_u32_keys allocated at end of structure.
  77          */
  78         struct tc_u32_sel       sel;
  79 };
  80
  81 struct tc_u_hnode {
  82         struct tc_u_hnode __rcu *next;
  83         u32                     handle;
  84         u32                     prio;
  85         struct tc_u_common      *tp_c;
  86         int                     refcnt;
  87         unsigned int            divisor;
  88         struct idr              handle_idr;
  89         struct rcu_head         rcu;
  90         u32                     flags;
  91         /* The 'ht' field MUST be the last field in structure to allow for
  92          * more entries allocated at end of structure.
  93          */
  94         struct tc_u_knode __rcu *ht[1];
  95 };
  96
  97 struct tc_u_common {
  98         struct tc_u_hnode __rcu *hlist;
  99         struct tcf_block        *block;
 100         int                     refcnt;
 101         struct idr              handle_idr;
 102         struct hlist_node       hnode;
 103         struct rcu_head         rcu;
 104 };
 105
 106 static inline unsigned int u32_hash_fold(__be32 key,
 107                                          const struct tc_u32_sel *sel,
 108                                          u8 fshift)
 109 {
 110         unsigned int h = ntohl(key & sel->hmask) >> fshift;
 111
 112         return h;
 113 }
 114
 115 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 116                         struct tcf_result *res)
 117 {
 118         struct {
 119                 struct tc_u_knode *knode;
 120                 unsigned int      off;
 121         } stack[TC_U32_MAXDEPTH];
 122
 123         struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
 124         unsigned int off = skb_network_offset(skb);
 125         struct tc_u_knode *n;
 126         int sdepth = 0;
 127         int off2 = 0;
 128         int sel = 0;
 129 #ifdef CONFIG_CLS_U32_PERF
 130         int j;
 131 #endif
 132         int i, r;
 133
 134 next_ht:
 135         n = rcu_dereference_bh(ht->ht[sel]);
 136
 137 next_knode:
 138         if (n) {
 139                 struct tc_u32_key *key = n->sel.keys;
 140
 141 #ifdef CONFIG_CLS_U32_PERF
 142                 __this_cpu_inc(n->pf->rcnt);
 143                 j = 0;
 144 #endif
 145
 146                 if (tc_skip_sw(n->flags)) {
 147                         n = rcu_dereference_bh(n->next);
 148                         goto next_knode;
 149                 }
 150
 151 #ifdef CONFIG_CLS_U32_MARK
 152                 if ((skb->mark & n->mask) != n->val) {
 153                         n = rcu_dereference_bh(n->next);
 154                         goto next_knode;
 155                 } else {
 156                         __this_cpu_inc(*n->pcpu_success);
 157                 }
 158 #endif
 159
 160                 for (i = n->sel.nkeys; i > 0; i--, key++) {
 161                         int toff = off + key->off + (off2 & key->offmask);
 162                         __be32 *data, hdata;
 163
 164                         if (skb_headroom(skb) + toff > INT_MAX)
 165                                 goto out;
 166
 167                         data = skb_header_pointer(skb, toff, 4, &hdata);
 168                         if (!data)
 169                                 goto out;
 170                         if ((*data ^ key->val) & key->mask) {
 171                                 n = rcu_dereference_bh(n->next);
 172                                 goto next_knode;
 173                         }
 174 #ifdef CONFIG_CLS_U32_PERF
 175                         __this_cpu_inc(n->pf->kcnts[j]);
 176                         j++;
 177 #endif
 178                 }
 179
 180                 ht = rcu_dereference_bh(n->ht_down);
 181                 if (!ht) {
 182 check_terminal:
 183                         if (n->sel.flags & TC_U32_TERMINAL) {
 184
 185                                 *res = n->res;
 186 #ifdef CONFIG_NET_CLS_IND
 187                                 if (!tcf_match_indev(skb, n->ifindex)) {
 188                                         n = rcu_dereference_bh(n->next);
 189                                         goto next_knode;
 190                                 }
 191 #endif
 192 #ifdef CONFIG_CLS_U32_PERF
 193                                 __this_cpu_inc(n->pf->rhit);
 194 #endif
 195                                 r = tcf_exts_exec(skb, &n->exts, res);
 196                                 if (r < 0) {
 197                                         n = rcu_dereference_bh(n->next);
 198                                         goto next_knode;
 199                                 }
 200
 201                                 return r;
 202                         }
 203                         n = rcu_dereference_bh(n->next);
 204                         goto next_knode;
 205                 }
 206
 207                 /* PUSH */
 208                 if (sdepth >= TC_U32_MAXDEPTH)
 209                         goto deadloop;
 210                 stack[sdepth].knode = n;
 211                 stack[sdepth].off = off;
 212                 sdepth++;
 213
 214                 ht = rcu_dereference_bh(n->ht_down);
 215                 sel = 0;
 216                 if (ht->divisor) {
 217                         __be32 *data, hdata;
 218
 219                         data = skb_header_pointer(skb, off + n->sel.hoff, 4,
 220                                                   &hdata);
 221                         if (!data)
 222                                 goto out;
 223                         sel = ht->divisor & u32_hash_fold(*data, &n->sel,
 224                                                           n->fshift);
 225                 }
 226                 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
 227                         goto next_ht;
 228
 229                 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
 230                         off2 = n->sel.off + 3;
 231                         if (n->sel.flags & TC_U32_VAROFFSET) {
 232                                 __be16 *data, hdata;
 233
 234                                 data = skb_header_pointer(skb,
 235                                                           off + n->sel.offoff,
 236                                                           2, &hdata);
 237                                 if (!data)
 238                                         goto out;
 239                                 off2 += ntohs(n->sel.offmask & *data) >>
 240                                         n->sel.offshift;
 241                         }
 242                         off2 &= ~3;
 243                 }
 244                 if (n->sel.flags & TC_U32_EAT) {
 245                         off += off2;
 246                         off2 = 0;
 247                 }
 248
 249                 if (off < skb->len)
 250                         goto next_ht;
 251         }
 252
 253         /* POP */
 254         if (sdepth--) {
 255                 n = stack[sdepth].knode;
 256                 ht = rcu_dereference_bh(n->ht_up);
 257                 off = stack[sdepth].off;
 258                 goto check_terminal;
 259         }
 260 out:
 261         return -1;
 262
 263 deadloop:
 264         net_warn_ratelimited("cls_u32: dead loop\n");
 265         return -1;
 266 }
 267
 268 static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 269 {
 270         struct tc_u_hnode *ht;
 271
 272         for (ht = rtnl_dereference(tp_c->hlist);
 273              ht;
 274              ht = rtnl_dereference(ht->next))
 275                 if (ht->handle == handle)
 276                         break;
 277
 278         return ht;
 279 }
 280
 281 static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 282 {
 283         unsigned int sel;
 284         struct tc_u_knode *n = NULL;
 285
 286         sel = TC_U32_HASH(handle);
 287         if (sel > ht->divisor)
 288                 goto out;
 289
 290         for (n = rtnl_dereference(ht->ht[sel]);
 291              n;
 292              n = rtnl_dereference(n->next))
 293                 if (n->handle == handle)
 294                         break;
 295 out:
 296         return n;
 297 }
 298
 299
 300 static void *u32_get(struct tcf_proto *tp, u32 handle)
 301 {
 302         struct tc_u_hnode *ht;
 303         struct tc_u_common *tp_c = tp->data;
 304
 305         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 306                 ht = rtnl_dereference(tp->root);
 307         else
 308                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 309
 310         if (!ht)
 311                 return NULL;
 312
 313         if (TC_U32_KEY(handle) == 0)
 314                 return ht;
 315
 316         return u32_lookup_key(ht, handle);
 317 }
 318
 319 /* Protected by rtnl lock */
 320 static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
 321 {
 322         int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL);
 323         if (id < 0)
 324                 return 0;
 325         return (id | 0x800U) << 20;
 326 }
 327
 328 static struct hlist_head *tc_u_common_hash;
 329
 330 #define U32_HASH_SHIFT 10
 331 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
 332
 333 static unsigned int tc_u_hash(const struct tcf_proto *tp)
 334 {
 335         return hash_ptr(tp->chain->block, U32_HASH_SHIFT);
 336 }
 337
 338 static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
 339 {
 340         struct tc_u_common *tc;
 341         unsigned int h;
 342
 343         h = tc_u_hash(tp);
 344         hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
 345                 if (tc->block == tp->chain->block)
 346                         return tc;
 347         }
 348         return NULL;
 349 }
 350
 351 static int u32_init(struct tcf_proto *tp)
 352 {
 353         struct tc_u_hnode *root_ht;
 354         struct tc_u_common *tp_c;
 355         unsigned int h;
 356
 357         tp_c = tc_u_common_find(tp);
 358
 359         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 360         if (root_ht == NULL)
 361                 return -ENOBUFS;
 362
 363         root_ht->refcnt++;
 364         root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
 365         root_ht->prio = tp->prio;
 366         idr_init(&root_ht->handle_idr);
 367
 368         if (tp_c == NULL) {
 369                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
 370                 if (tp_c == NULL) {
 371                         kfree(root_ht);
 372                         return -ENOBUFS;
 373                 }
 374                 tp_c->block = tp->chain->block;
 375                 INIT_HLIST_NODE(&tp_c->hnode);
 376                 idr_init(&tp_c->handle_idr);
 377
 378                 h = tc_u_hash(tp);
 379                 hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
 380         }
 381
 382         tp_c->refcnt++;
 383         RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
 384         rcu_assign_pointer(tp_c->hlist, root_ht);
 385         root_ht->tp_c = tp_c;
 386
 387         rcu_assign_pointer(tp->root, root_ht);
 388         tp->data = tp_c;
 389         return 0;
 390 }
 391
 392 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
 393                            bool free_pf)
 394 {
 395         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 396
 397         tcf_exts_destroy(&n->exts);
 398         tcf_exts_put_net(&n->exts);
 399         if (ht && --ht->refcnt == 0)
 400                 kfree(ht);
 401 #ifdef CONFIG_CLS_U32_PERF
 402         if (free_pf)
 403                 free_percpu(n->pf);
 404 #endif
 405 #ifdef CONFIG_CLS_U32_MARK
 406         if (free_pf)
 407                 free_percpu(n->pcpu_success);
 408 #endif
 409         kfree(n);
 410         return 0;
 411 }
 412
 413 /* u32_delete_key_rcu should be called when free'ing a copied
 414  * version of a tc_u_knode obtained from u32_init_knode(). When
 415  * copies are obtained from u32_init_knode() the statistics are
 416  * shared between the old and new copies to allow readers to
 417  * continue to update the statistics during the copy. To support
 418  * this the u32_delete_key_rcu variant does not free the percpu
 419  * statistics.
 420  */
 421 static void u32_delete_key_work(struct work_struct *work)
 422 {
 423         struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
 424
 425         rtnl_lock();
 426         u32_destroy_key(key->tp, key, false);
 427         rtnl_unlock();
 428 }
 429
 430 static void u32_delete_key_rcu(struct rcu_head *rcu)
 431 {
 432         struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
 433
 434         INIT_WORK(&key->work, u32_delete_key_work);
 435         tcf_queue_work(&key->work);
 436 }
 437
 438 /* u32_delete_key_freepf_rcu is the rcu callback variant
 439  * that free's the entire structure including the statistics
 440  * percpu variables. Only use this if the key is not a copy
 441  * returned by u32_init_knode(). See u32_delete_key_rcu()
 442  * for the variant that should be used with keys return from
 443  * u32_init_knode()
 444  */
 445 static void u32_delete_key_freepf_work(struct work_struct *work)
 446 {
 447         struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
 448
 449         rtnl_lock();
 450         u32_destroy_key(key->tp, key, true);
 451         rtnl_unlock();
 452 }
 453
 454 static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
 455 {
 456         struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
 457
 458         INIT_WORK(&key->work, u32_delete_key_freepf_work);
 459         tcf_queue_work(&key->work);
 460 }
 461
 462 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
 463 {
 464         struct tc_u_knode __rcu **kp;
 465         struct tc_u_knode *pkp;
 466         struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
 467
 468         if (ht) {
 469                 kp = &ht->ht[TC_U32_HASH(key->handle)];
 470                 for (pkp = rtnl_dereference(*kp); pkp;
 471                      kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
 472                         if (pkp == key) {
 473                                 RCU_INIT_POINTER(*kp, key->next);
 474
 475                                 tcf_unbind_filter(tp, &key->res);
 476                                 tcf_exts_get_net(&key->exts);
 477                                 call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
 478                                 return 0;
 479                         }
 480                 }
 481         }
 482         WARN_ON(1);
 483         return 0;
 484 }
 485
 486 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 487                                struct netlink_ext_ack *extack)
 488 {
 489         struct tcf_block *block = tp->chain->block;
 490         struct tc_cls_u32_offload cls_u32 = {};
 491
 492         tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
 493         cls_u32.command = TC_CLSU32_DELETE_HNODE;
 494         cls_u32.hnode.divisor = h->divisor;
 495         cls_u32.hnode.handle = h->handle;
 496         cls_u32.hnode.prio = h->prio;
 497
 498         tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
 499 }
 500
 501 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
 502                                 u32 flags, struct netlink_ext_ack *extack)
 503 {
 504         struct tcf_block *block = tp->chain->block;
 505         struct tc_cls_u32_offload cls_u32 = {};
 506         bool skip_sw = tc_skip_sw(flags);
 507         bool offloaded = false;
 508         int err;
 509
 510         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 511         cls_u32.command = TC_CLSU32_NEW_HNODE;
 512         cls_u32.hnode.divisor = h->divisor;
 513         cls_u32.hnode.handle = h->handle;
 514         cls_u32.hnode.prio = h->prio;
 515
 516         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 517         if (err < 0) {
 518                 u32_clear_hw_hnode(tp, h, NULL);
 519                 return err;
 520         } else if (err > 0) {
 521                 offloaded = true;
 522         }
 523
 524         if (skip_sw && !offloaded)
 525                 return -EINVAL;
 526
 527         return 0;
 528 }
 529
 530 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 531                                 struct netlink_ext_ack *extack)
 532 {
 533         struct tcf_block *block = tp->chain->block;
 534         struct tc_cls_u32_offload cls_u32 = {};
 535
 536         tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
 537         cls_u32.command = TC_CLSU32_DELETE_KNODE;
 538         cls_u32.knode.handle = n->handle;
 539
 540         tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
 541         tcf_block_offload_dec(block, &n->flags);
 542 }
 543
 544 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
 545                                 u32 flags, struct netlink_ext_ack *extack)
 546 {
 547         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 548         struct tcf_block *block = tp->chain->block;
 549         struct tc_cls_u32_offload cls_u32 = {};
 550         bool skip_sw = tc_skip_sw(flags);
 551         int err;
 552
 553         tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
 554         cls_u32.command = TC_CLSU32_REPLACE_KNODE;
 555         cls_u32.knode.handle = n->handle;
 556         cls_u32.knode.fshift = n->fshift;
 557 #ifdef CONFIG_CLS_U32_MARK
 558         cls_u32.knode.val = n->val;
 559         cls_u32.knode.mask = n->mask;
 560 #else
 561         cls_u32.knode.val = 0;
 562         cls_u32.knode.mask = 0;
 563 #endif
 564         cls_u32.knode.sel = &n->sel;
 565         cls_u32.knode.exts = &n->exts;
 566         if (n->ht_down)
 567                 cls_u32.knode.link_handle = ht->handle;
 568
 569         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
 570         if (err < 0) {
 571                 u32_remove_hw_knode(tp, n, NULL);
 572                 return err;
 573         } else if (err > 0) {
 574                 tcf_block_offload_inc(block, &n->flags);
 575         }
 576
 577         if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
 578                 return -EINVAL;
 579
 580         return 0;
 581 }
 582
 583 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 584                             struct netlink_ext_ack *extack)
 585 {
 586         struct tc_u_knode *n;
 587         unsigned int h;
 588
 589         for (h = 0; h <= ht->divisor; h++) {
 590                 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
 591                         RCU_INIT_POINTER(ht->ht[h],
 592                                          rtnl_dereference(n->next));
 593                         tcf_unbind_filter(tp, &n->res);
 594                         u32_remove_hw_knode(tp, n, extack);
 595                         idr_remove(&ht->handle_idr, n->handle);
 596                         if (tcf_exts_get_net(&n->exts))
 597                                 call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
 598                         else
 599                                 u32_destroy_key(n->tp, n, true);
 600                 }
 601         }
 602 }
 603
 604 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
 605                              struct netlink_ext_ack *extack)
 606 {
 607         struct tc_u_common *tp_c = tp->data;
 608         struct tc_u_hnode __rcu **hn;
 609         struct tc_u_hnode *phn;
 610
 611         WARN_ON(ht->refcnt);
 612
 613         u32_clear_hnode(tp, ht, extack);
 614
 615         hn = &tp_c->hlist;
 616         for (phn = rtnl_dereference(*hn);
 617              phn;
 618              hn = &phn->next, phn = rtnl_dereference(*hn)) {
 619                 if (phn == ht) {
 620                         u32_clear_hw_hnode(tp, ht, extack);
 621                         idr_destroy(&ht->handle_idr);
 622                         idr_remove(&tp_c->handle_idr, ht->handle);
 623                         RCU_INIT_POINTER(*hn, ht->next);
 624                         kfree_rcu(ht, rcu);
 625                         return 0;
 626                 }
 627         }
 628
 629         return -ENOENT;
 630 }
 631
 632 static bool ht_empty(struct tc_u_hnode *ht)
 633 {
 634         unsigned int h;
 635
 636         for (h = 0; h <= ht->divisor; h++)
 637                 if (rcu_access_pointer(ht->ht[h]))
 638                         return false;
 639
 640         return true;
 641 }
 642
 643 static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
 644 {
 645         struct tc_u_common *tp_c = tp->data;
 646         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 647
 648         WARN_ON(root_ht == NULL);
 649
 650         if (root_ht && --root_ht->refcnt == 0)
 651                 u32_destroy_hnode(tp, root_ht, extack);
 652
 653         if (--tp_c->refcnt == 0) {
 654                 struct tc_u_hnode *ht;
 655
 656                 hlist_del(&tp_c->hnode);
 657
 658                 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
 659                         u32_clear_hnode(tp, ht, extack);
 660                         RCU_INIT_POINTER(tp_c->hlist, ht->next);
 661
 662                         /* u32_destroy_key() will later free ht for us, if it's
 663                          * still referenced by some knode
 664                          */
 665                         if (--ht->refcnt == 0)
 666                                 kfree_rcu(ht, rcu);
 667                 }
 668
 669                 idr_destroy(&tp_c->handle_idr);
 670                 kfree(tp_c);
 671         }
 672
 673         tp->data = NULL;
 674 }
 675
 676 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
 677                       struct netlink_ext_ack *extack)
 678 {
 679         struct tc_u_hnode *ht = arg;
 680         struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
 681         struct tc_u_common *tp_c = tp->data;
 682         int ret = 0;
 683
 684         if (ht == NULL)
 685                 goto out;
 686
 687         if (TC_U32_KEY(ht->handle)) {
 688                 u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
 689                 ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
 690                 goto out;
 691         }
 692
 693         if (root_ht == ht) {
 694                 NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
 695                 return -EINVAL;
 696         }
 697
 698         if (ht->refcnt == 1) {
 699                 ht->refcnt--;
 700                 u32_destroy_hnode(tp, ht, extack);
 701         } else {
 702                 NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
 703                 return -EBUSY;
 704         }
 705
 706 out:
 707         *last = true;
 708         if (root_ht) {
 709                 if (root_ht->refcnt > 1) {
 710                         *last = false;
 711                         goto ret;
 712                 }
 713                 if (root_ht->refcnt == 1) {
 714                         if (!ht_empty(root_ht)) {
 715                                 *last = false;
 716                                 goto ret;
 717                         }
 718                 }
 719         }
 720
 721         if (tp_c->refcnt > 1) {
 722                 *last = false;
 723                 goto ret;
 724         }
 725
 726         if (tp_c->refcnt == 1) {
 727                 struct tc_u_hnode *ht;
 728
 729                 for (ht = rtnl_dereference(tp_c->hlist);
 730                      ht;
 731                      ht = rtnl_dereference(ht->next))
 732                         if (!ht_empty(ht)) {
 733                                 *last = false;
 734                                 break;
 735                         }
 736         }
 737
 738 ret:
 739         return ret;
 740 }
 741
 742 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
 743 {
 744         u32 index = htid | 0x800;
 745         u32 max = htid | 0xFFF;
 746
 747         if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) {
 748                 index = htid + 1;
 749                 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max,
 750                                  GFP_KERNEL))
 751                         index = max;
 752         }
 753
 754         return index;
 755 }
 756
 757 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 758         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 759         [TCA_U32_HASH]          = { .type = NLA_U32 },
 760         [TCA_U32_LINK]          = { .type = NLA_U32 },
 761         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 762         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 763         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 764         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 765         [TCA_U32_FLAGS]         = { .type = NLA_U32 },
 766 };
 767
 768 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 769                          unsigned long base, struct tc_u_hnode *ht,
 770                          struct tc_u_knode *n, struct nlattr **tb,
 771                          struct nlattr *est, bool ovr,
 772                          struct netlink_ext_ack *extack)
 773 {
 774         int err;
 775
 776         err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
 777         if (err < 0)
 778                 return err;
 779
 780         if (tb[TCA_U32_LINK]) {
 781                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 782                 struct tc_u_hnode *ht_down = NULL, *ht_old;
 783
 784                 if (TC_U32_KEY(handle)) {
 785                         NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
 786                         return -EINVAL;
 787                 }
 788
 789                 if (handle) {
 790                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 791
 792                         if (!ht_down) {
 793                                 NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
 794                                 return -EINVAL;
 795                         }
 796                         ht_down->refcnt++;
 797                 }
 798
 799                 ht_old = rtnl_dereference(n->ht_down);
 800                 rcu_assign_pointer(n->ht_down, ht_down);
 801
 802                 if (ht_old)
 803                         ht_old->refcnt--;
 804         }
 805         if (tb[TCA_U32_CLASSID]) {
 806                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 807                 tcf_bind_filter(tp, &n->res, base);
 808         }
 809
 810 #ifdef CONFIG_NET_CLS_IND
 811         if (tb[TCA_U32_INDEV]) {
 812                 int ret;
 813                 ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
 814                 if (ret < 0)
 815                         return -EINVAL;
 816                 n->ifindex = ret;
 817         }
 818 #endif
 819         return 0;
 820 }
 821
 822 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
 823                               struct tc_u_knode *n)
 824 {
 825         struct tc_u_knode __rcu **ins;
 826         struct tc_u_knode *pins;
 827         struct tc_u_hnode *ht;
 828
 829         if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
 830                 ht = rtnl_dereference(tp->root);
 831         else
 832                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
 833
 834         ins = &ht->ht[TC_U32_HASH(n->handle)];
 835
 836         /* The node must always exist for it to be replaced if this is not the
 837          * case then something went very wrong elsewhere.
 838          */
 839         for (pins = rtnl_dereference(*ins); ;
 840              ins = &pins->next, pins = rtnl_dereference(*ins))
 841                 if (pins->handle == n->handle)
 842                         break;
 843
 844         idr_replace(&ht->handle_idr, n, n->handle);
 845         RCU_INIT_POINTER(n->next, pins->next);
 846         rcu_assign_pointer(*ins, n);
 847 }
 848
 849 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
 850                                          struct tc_u_knode *n)
 851 {
 852         struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
 853         struct tc_u32_sel *s = &n->sel;
 854         struct tc_u_knode *new;
 855
 856         new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
 857                       GFP_KERNEL);
 858
 859         if (!new)
 860                 return NULL;
 861
 862         RCU_INIT_POINTER(new->next, n->next);
 863         new->handle = n->handle;
 864         RCU_INIT_POINTER(new->ht_up, n->ht_up);
 865
 866 #ifdef CONFIG_NET_CLS_IND
 867         new->ifindex = n->ifindex;
 868 #endif
 869         new->fshift = n->fshift;
 870         new->res = n->res;
 871         new->flags = n->flags;
 872         RCU_INIT_POINTER(new->ht_down, ht);
 873
 874         /* bump reference count as long as we hold pointer to structure */
 875         if (ht)
 876                 ht->refcnt++;
 877
 878 #ifdef CONFIG_CLS_U32_PERF
 879         /* Statistics may be incremented by readers during update
 880          * so we must keep them in tact. When the node is later destroyed
 881          * a special destroy call must be made to not free the pf memory.
 882          */
 883         new->pf = n->pf;
 884 #endif
 885
 886 #ifdef CONFIG_CLS_U32_MARK
 887         new->val = n->val;
 888         new->mask = n->mask;
 889         /* Similarly success statistics must be moved as pointers */
 890         new->pcpu_success = n->pcpu_success;
 891 #endif
 892         new->tp = tp;
 893         memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 894
 895         if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
 896                 kfree(new);
 897                 return NULL;
 898         }
 899
 900         return new;
 901 }
 902
 903 static int u32_change(struct net *net, struct sk_buff *in_skb,
 904                       struct tcf_proto *tp, unsigned long base, u32 handle,
 905                       struct nlattr **tca, void **arg, bool ovr,
 906                       struct netlink_ext_ack *extack)
 907 {
 908         struct tc_u_common *tp_c = tp->data;
 909         struct tc_u_hnode *ht;
 910         struct tc_u_knode *n;
 911         struct tc_u32_sel *s;
 912         struct nlattr *opt = tca[TCA_OPTIONS];
 913         struct nlattr *tb[TCA_U32_MAX + 1];
 914         u32 htid, flags = 0;
 915         int err;
 916 #ifdef CONFIG_CLS_U32_PERF
 917         size_t size;
 918 #endif
 919
 920         if (!opt) {
 921                 if (handle) {
 922                         NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
 923                         return -EINVAL;
 924                 } else {
 925                         return 0;
 926                 }
 927         }
 928
 929         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack);
 930         if (err < 0)
 931                 return err;
 932
 933         if (tb[TCA_U32_FLAGS]) {
 934                 flags = nla_get_u32(tb[TCA_U32_FLAGS]);
 935                 if (!tc_flags_valid(flags)) {
 936                         NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
 937                         return -EINVAL;
 938                 }
 939         }
 940
 941         n = *arg;
 942         if (n) {
 943                 struct tc_u_knode *new;
 944
 945                 if (TC_U32_KEY(n->handle) == 0) {
 946                         NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
 947                         return -EINVAL;
 948                 }
 949
 950                 if (n->flags != flags) {
 951                         NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
 952                         return -EINVAL;
 953                 }
 954
 955                 new = u32_init_knode(tp, n);
 956                 if (!new)
 957                         return -ENOMEM;
 958
 959                 err = u32_set_parms(net, tp, base,
 960                                     rtnl_dereference(n->ht_up), new, tb,
 961                                     tca[TCA_RATE], ovr, extack);
 962
 963                 if (err) {
 964                         u32_destroy_key(tp, new, false);
 965                         return err;
 966                 }
 967
 968                 err = u32_replace_hw_knode(tp, new, flags, extack);
 969                 if (err) {
 970                         u32_destroy_key(tp, new, false);
 971                         return err;
 972                 }
 973
 974                 if (!tc_in_hw(new->flags))
 975                         new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
 976
 977                 u32_replace_knode(tp, tp_c, new);
 978                 tcf_unbind_filter(tp, &n->res);
 979                 tcf_exts_get_net(&n->exts);
 980                 call_rcu(&n->rcu, u32_delete_key_rcu);
 981                 return 0;
 982         }
 983
 984         if (tb[TCA_U32_DIVISOR]) {
 985                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 986
 987                 if (--divisor > 0x100) {
 988                         NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
 989                         return -EINVAL;
 990                 }
 991                 if (TC_U32_KEY(handle)) {
 992                         NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
 993                         return -EINVAL;
 994                 }
 995                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
 996                 if (ht == NULL)
 997                         return -ENOBUFS;
 998                 if (handle == 0) {
 999                         handle = gen_new_htid(tp->data, ht);
1000                         if (handle == 0) {
1001                                 kfree(ht);
1002                                 return -ENOMEM;
1003                         }
1004                 } else {
1005                         err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
1006                                             handle, GFP_KERNEL);
1007                         if (err) {
1008                                 kfree(ht);
1009                                 return err;
1010                         }
1011                 }
1012                 ht->tp_c = tp_c;
1013                 ht->refcnt = 1;
1014                 ht->divisor = divisor;
1015                 ht->handle = handle;
1016                 ht->prio = tp->prio;
1017                 idr_init(&ht->handle_idr);
1018                 ht->flags = flags;
1019
1020                 err = u32_replace_hw_hnode(tp, ht, flags, extack);
1021                 if (err) {
1022                         idr_remove(&tp_c->handle_idr, handle);
1023                         kfree(ht);
1024                         return err;
1025                 }
1026
1027                 RCU_INIT_POINTER(ht->next, tp_c->hlist);
1028                 rcu_assign_pointer(tp_c->hlist, ht);
1029                 *arg = ht;
1030
1031                 return 0;
1032         }
1033
1034         if (tb[TCA_U32_HASH]) {
1035                 htid = nla_get_u32(tb[TCA_U32_HASH]);
1036                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
1037                         ht = rtnl_dereference(tp->root);
1038                         htid = ht->handle;
1039                 } else {
1040                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
1041                         if (!ht) {
1042                                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
1043                                 return -EINVAL;
1044                         }
1045                 }
1046         } else {
1047                 ht = rtnl_dereference(tp->root);
1048                 htid = ht->handle;
1049         }
1050
1051         if (ht->divisor < TC_U32_HASH(htid)) {
1052                 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
1053                 return -EINVAL;
1054         }
1055
1056         if (handle) {
1057                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1058                         NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1059                         return -EINVAL;
1060                 }
1061                 handle = htid | TC_U32_NODE(handle);
1062                 err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
1063                                     GFP_KERNEL);
1064                 if (err)
1065                         return err;
1066         } else
1067                 handle = gen_new_kid(ht, htid);
1068
1069         if (tb[TCA_U32_SEL] == NULL) {
1070                 NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1071                 err = -EINVAL;
1072                 goto erridr;
1073         }
1074
1075         s = nla_data(tb[TCA_U32_SEL]);
1076
1077         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
1078         if (n == NULL) {
1079                 err = -ENOBUFS;
1080                 goto erridr;
1081         }
1082
1083 #ifdef CONFIG_CLS_U32_PERF
1084         size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1085         n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1086         if (!n->pf) {
1087                 err = -ENOBUFS;
1088                 goto errfree;
1089         }
1090 #endif
1091
1092         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
1093         RCU_INIT_POINTER(n->ht_up, ht);
1094         n->handle = handle;
1095         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1096         n->flags = flags;
1097         n->tp = tp;
1098
1099         err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1100         if (err < 0)
1101                 goto errout;
1102
1103 #ifdef CONFIG_CLS_U32_MARK
1104         n->pcpu_success = alloc_percpu(u32);
1105         if (!n->pcpu_success) {
1106                 err = -ENOMEM;
1107                 goto errout;
1108         }
1109
1110         if (tb[TCA_U32_MARK]) {
1111                 struct tc_u32_mark *mark;
1112
1113                 mark = nla_data(tb[TCA_U32_MARK]);
1114                 n->val = mark->val;
1115                 n->mask = mark->mask;
1116         }
1117 #endif
1118
1119         err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr,
1120                             extack);
1121         if (err == 0) {
1122                 struct tc_u_knode __rcu **ins;
1123                 struct tc_u_knode *pins;
1124
1125                 err = u32_replace_hw_knode(tp, n, flags, extack);
1126                 if (err)
1127                         goto errhw;
1128
1129                 if (!tc_in_hw(n->flags))
1130                         n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1131
1132                 ins = &ht->ht[TC_U32_HASH(handle)];
1133                 for (pins = rtnl_dereference(*ins); pins;
1134                      ins = &pins->next, pins = rtnl_dereference(*ins))
1135                         if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1136                                 break;
1137
1138                 RCU_INIT_POINTER(n->next, pins);
1139                 rcu_assign_pointer(*ins, n);
1140                 *arg = n;
1141                 return 0;
1142         }
1143
1144 errhw:
1145 #ifdef CONFIG_CLS_U32_MARK
1146         free_percpu(n->pcpu_success);
1147 #endif
1148
1149 errout:
1150         tcf_exts_destroy(&n->exts);
1151 #ifdef CONFIG_CLS_U32_PERF
1152 errfree:
1153         free_percpu(n->pf);
1154 #endif
1155         kfree(n);
1156 erridr:
1157         idr_remove(&ht->handle_idr, handle);
1158         return err;
1159 }
1160
1161 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1162 {
1163         struct tc_u_common *tp_c = tp->data;
1164         struct tc_u_hnode *ht;
1165         struct tc_u_knode *n;
1166         unsigned int h;
1167
1168         if (arg->stop)
1169                 return;
1170
1171         for (ht = rtnl_dereference(tp_c->hlist);
1172              ht;
1173              ht = rtnl_dereference(ht->next)) {
1174                 if (ht->prio != tp->prio)
1175                         continue;
1176                 if (arg->count >= arg->skip) {
1177                         if (arg->fn(tp, ht, arg) < 0) {
1178                                 arg->stop = 1;
1179                                 return;
1180                         }
1181                 }
1182                 arg->count++;
1183                 for (h = 0; h <= ht->divisor; h++) {
1184                         for (n = rtnl_dereference(ht->ht[h]);
1185                              n;
1186                              n = rtnl_dereference(n->next)) {
1187                                 if (arg->count < arg->skip) {
1188                                         arg->count++;
1189                                         continue;
1190                                 }
1191                                 if (arg->fn(tp, n, arg) < 0) {
1192                                         arg->stop = 1;
1193                                         return;
1194                                 }
1195                                 arg->count++;
1196                         }
1197                 }
1198         }
1199 }
1200
1201 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1202 {
1203         struct tc_u_knode *n = fh;
1204
1205         if (n && n->res.classid == classid)
1206                 n->res.class = cl;
1207 }
1208
1209 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1210                     struct sk_buff *skb, struct tcmsg *t)
1211 {
1212         struct tc_u_knode *n = fh;
1213         struct tc_u_hnode *ht_up, *ht_down;
1214         struct nlattr *nest;
1215
1216         if (n == NULL)
1217                 return skb->len;
1218
1219         t->tcm_handle = n->handle;
1220
1221         nest = nla_nest_start(skb, TCA_OPTIONS);
1222         if (nest == NULL)
1223                 goto nla_put_failure;
1224
1225         if (TC_U32_KEY(n->handle) == 0) {
1226                 struct tc_u_hnode *ht = fh;
1227                 u32 divisor = ht->divisor + 1;
1228
1229                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1230                         goto nla_put_failure;
1231         } else {
1232 #ifdef CONFIG_CLS_U32_PERF
1233                 struct tc_u32_pcnt *gpf;
1234                 int cpu;
1235 #endif
1236
1237                 if (nla_put(skb, TCA_U32_SEL,
1238                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1239                             &n->sel))
1240                         goto nla_put_failure;
1241
1242                 ht_up = rtnl_dereference(n->ht_up);
1243                 if (ht_up) {
1244                         u32 htid = n->handle & 0xFFFFF000;
1245                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
1246                                 goto nla_put_failure;
1247                 }
1248                 if (n->res.classid &&
1249                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1250                         goto nla_put_failure;
1251
1252                 ht_down = rtnl_dereference(n->ht_down);
1253                 if (ht_down &&
1254                     nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1255                         goto nla_put_failure;
1256
1257                 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1258                         goto nla_put_failure;
1259
1260 #ifdef CONFIG_CLS_U32_MARK
1261                 if ((n->val || n->mask)) {
1262                         struct tc_u32_mark mark = {.val = n->val,
1263                                                    .mask = n->mask,
1264                                                    .success = 0};
1265                         int cpum;
1266
1267                         for_each_possible_cpu(cpum) {
1268                                 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1269
1270                                 mark.success += cnt;
1271                         }
1272
1273                         if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1274                                 goto nla_put_failure;
1275                 }
1276 #endif
1277
1278                 if (tcf_exts_dump(skb, &n->exts) < 0)
1279                         goto nla_put_failure;
1280
1281 #ifdef CONFIG_NET_CLS_IND
1282                 if (n->ifindex) {
1283                         struct net_device *dev;
1284                         dev = __dev_get_by_index(net, n->ifindex);
1285                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1286                                 goto nla_put_failure;
1287                 }
1288 #endif
1289 #ifdef CONFIG_CLS_U32_PERF
1290                 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1291                               n->sel.nkeys * sizeof(u64),
1292                               GFP_KERNEL);
1293                 if (!gpf)
1294                         goto nla_put_failure;
1295
1296                 for_each_possible_cpu(cpu) {
1297                         int i;
1298                         struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1299
1300                         gpf->rcnt += pf->rcnt;
1301                         gpf->rhit += pf->rhit;
1302                         for (i = 0; i < n->sel.nkeys; i++)
1303                                 gpf->kcnts[i] += pf->kcnts[i];
1304                 }
1305
1306                 if (nla_put_64bit(skb, TCA_U32_PCNT,
1307                                   sizeof(struct tc_u32_pcnt) +
1308                                   n->sel.nkeys * sizeof(u64),
1309                                   gpf, TCA_U32_PAD)) {
1310                         kfree(gpf);
1311                         goto nla_put_failure;
1312                 }
1313                 kfree(gpf);
1314 #endif
1315         }
1316
1317         nla_nest_end(skb, nest);
1318
1319         if (TC_U32_KEY(n->handle))
1320                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1321                         goto nla_put_failure;
1322         return skb->len;
1323
1324 nla_put_failure:
1325         nla_nest_cancel(skb, nest);
1326         return -1;
1327 }
1328
1329 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1330         .kind           =       "u32",
1331         .classify       =       u32_classify,
1332         .init           =       u32_init,
1333         .destroy        =       u32_destroy,
1334         .get            =       u32_get,
1335         .change         =       u32_change,
1336         .delete         =       u32_delete,
1337         .walk           =       u32_walk,
1338         .dump           =       u32_dump,
1339         .bind_class     =       u32_bind_class,
1340         .owner          =       THIS_MODULE,
1341 };
1342
1343 static int __init init_u32(void)
1344 {
1345         int i, ret;
1346
1347         pr_info("u32 classifier\n");
1348 #ifdef CONFIG_CLS_U32_PERF
1349         pr_info("    Performance counters on\n");
1350 #endif
1351 #ifdef CONFIG_NET_CLS_IND
1352         pr_info("    input device check on\n");
1353 #endif
1354 #ifdef CONFIG_NET_CLS_ACT
1355         pr_info("    Actions configured\n");
1356 #endif
1357         tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1358                                           sizeof(struct hlist_head),
1359                                           GFP_KERNEL);
1360         if (!tc_u_common_hash)
1361                 return -ENOMEM;
1362
1363         for (i = 0; i < U32_HASH_SIZE; i++)
1364                 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1365
1366         ret = register_tcf_proto_ops(&cls_u32_ops);
1367         if (ret)
1368                 kvfree(tc_u_common_hash);
1369         return ret;
1370 }
1371
1372 static void __exit exit_u32(void)
1373 {
1374         unregister_tcf_proto_ops(&cls_u32_ops);
1375         kvfree(tc_u_common_hash);
1376 }
1377
1378 module_init(init_u32)
1379 module_exit(exit_u32)
1380 MODULE_LICENSE("GPL");